Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com |
| 3 | * Written by Alex Tomas <alex@clusterfs.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
Adam Buchbinder | b8a07463 | 2016-03-09 23:49:05 -0500 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- |
| 17 | */ |
| 18 | |
| 19 | |
| 20 | /* |
| 21 | * mballoc.c contains the multiblocks allocation routines |
| 22 | */ |
| 23 | |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 24 | #include "ext4_jbd2.h" |
Mingming Cao | 8f6e39a | 2008-04-29 22:01:31 -0400 | [diff] [blame] | 25 | #include "mballoc.h" |
Theodore Ts'o | 28623c2 | 2012-09-05 01:31:50 -0400 | [diff] [blame] | 26 | #include <linux/log2.h> |
Theodore Ts'o | a0b30c1 | 2013-02-09 16:28:20 -0500 | [diff] [blame] | 27 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 28 | #include <linux/slab.h> |
Tejun Heo | 66114ca | 2015-05-22 17:13:32 -0400 | [diff] [blame] | 29 | #include <linux/backing-dev.h> |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 30 | #include <trace/events/ext4.h> |
| 31 | |
Theodore Ts'o | a0b30c1 | 2013-02-09 16:28:20 -0500 | [diff] [blame] | 32 | #ifdef CONFIG_EXT4_DEBUG |
| 33 | ushort ext4_mballoc_debug __read_mostly; |
| 34 | |
| 35 | module_param_named(mballoc_debug, ext4_mballoc_debug, ushort, 0644); |
| 36 | MODULE_PARM_DESC(mballoc_debug, "Debugging level for ext4's mballoc"); |
| 37 | #endif |
| 38 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 39 | /* |
| 40 | * MUSTDO: |
| 41 | * - test ext4_ext_search_left() and ext4_ext_search_right() |
| 42 | * - search for metadata in few groups |
| 43 | * |
| 44 | * TODO v4: |
| 45 | * - normalization should take into account whether file is still open |
| 46 | * - discard preallocations if no free space left (policy?) |
| 47 | * - don't normalize tails |
| 48 | * - quota |
| 49 | * - reservation for superuser |
| 50 | * |
| 51 | * TODO v3: |
| 52 | * - bitmap read-ahead (proposed by Oleg Drokin aka green) |
| 53 | * - track min/max extents in each group for better group selection |
| 54 | * - mb_mark_used() may allocate chunk right after splitting buddy |
| 55 | * - tree of groups sorted by number of free blocks |
| 56 | * - error handling |
| 57 | */ |
| 58 | |
| 59 | /* |
| 60 | * The allocation request involve request for multiple number of blocks |
| 61 | * near to the goal(block) value specified. |
| 62 | * |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 63 | * During initialization phase of the allocator we decide to use the |
| 64 | * group preallocation or inode preallocation depending on the size of |
| 65 | * the file. The size of the file could be the resulting file size we |
| 66 | * would have after allocation, or the current file size, which ever |
| 67 | * is larger. If the size is less than sbi->s_mb_stream_request we |
| 68 | * select to use the group preallocation. The default value of |
| 69 | * s_mb_stream_request is 16 blocks. This can also be tuned via |
| 70 | * /sys/fs/ext4/<partition>/mb_stream_req. The value is represented in |
| 71 | * terms of number of blocks. |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 72 | * |
| 73 | * The main motivation for having small file use group preallocation is to |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 74 | * ensure that we have small files closer together on the disk. |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 75 | * |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 76 | * First stage the allocator looks at the inode prealloc list, |
| 77 | * ext4_inode_info->i_prealloc_list, which contains list of prealloc |
| 78 | * spaces for this particular inode. The inode prealloc space is |
| 79 | * represented as: |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 80 | * |
| 81 | * pa_lstart -> the logical start block for this prealloc space |
| 82 | * pa_pstart -> the physical start block for this prealloc space |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 83 | * pa_len -> length for this prealloc space (in clusters) |
| 84 | * pa_free -> free space available in this prealloc space (in clusters) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 85 | * |
| 86 | * The inode preallocation space is used looking at the _logical_ start |
| 87 | * block. If only the logical file block falls within the range of prealloc |
Tao Ma | caaf7a2 | 2011-07-11 18:42:42 -0400 | [diff] [blame] | 88 | * space we will consume the particular prealloc space. This makes sure that |
| 89 | * we have contiguous physical blocks representing the file blocks |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 90 | * |
| 91 | * The important thing to be noted in case of inode prealloc space is that |
| 92 | * we don't modify the values associated to inode prealloc space except |
| 93 | * pa_free. |
| 94 | * |
| 95 | * If we are not able to find blocks in the inode prealloc space and if we |
| 96 | * have the group allocation flag set then we look at the locality group |
Tao Ma | caaf7a2 | 2011-07-11 18:42:42 -0400 | [diff] [blame] | 97 | * prealloc space. These are per CPU prealloc list represented as |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 98 | * |
| 99 | * ext4_sb_info.s_locality_groups[smp_processor_id()] |
| 100 | * |
| 101 | * The reason for having a per cpu locality group is to reduce the contention |
| 102 | * between CPUs. It is possible to get scheduled at this point. |
| 103 | * |
| 104 | * The locality group prealloc space is used looking at whether we have |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 105 | * enough free space (pa_free) within the prealloc space. |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 106 | * |
| 107 | * If we can't allocate blocks via inode prealloc or/and locality group |
| 108 | * prealloc then we look at the buddy cache. The buddy cache is represented |
| 109 | * by ext4_sb_info.s_buddy_cache (struct inode) whose file offset gets |
| 110 | * mapped to the buddy and bitmap information regarding different |
| 111 | * groups. The buddy information is attached to buddy cache inode so that |
| 112 | * we can access them through the page cache. The information regarding |
| 113 | * each group is loaded via ext4_mb_load_buddy. The information involve |
| 114 | * block bitmap and buddy information. The information are stored in the |
| 115 | * inode as: |
| 116 | * |
| 117 | * { page } |
Aneesh Kumar K.V | c3a326a | 2008-11-25 15:11:52 -0500 | [diff] [blame] | 118 | * [ group 0 bitmap][ group 0 buddy] [group 1][ group 1]... |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 119 | * |
| 120 | * |
| 121 | * one block each for bitmap and buddy information. So for each group we |
Kirill A. Shutemov | ea1754a | 2016-04-01 15:29:48 +0300 | [diff] [blame] | 122 | * take up 2 blocks. A page can contain blocks_per_page (PAGE_SIZE / |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 123 | * blocksize) blocks. So it can have information regarding groups_per_page |
| 124 | * which is blocks_per_page/2 |
| 125 | * |
| 126 | * The buddy cache inode is not stored on disk. The inode is thrown |
| 127 | * away when the filesystem is unmounted. |
| 128 | * |
| 129 | * We look for count number of blocks in the buddy cache. If we were able |
| 130 | * to locate that many free blocks we return with additional information |
| 131 | * regarding rest of the contiguous physical block available |
| 132 | * |
| 133 | * Before allocating blocks via buddy cache we normalize the request |
| 134 | * blocks. This ensure we ask for more blocks that we needed. The extra |
| 135 | * blocks that we get after allocation is added to the respective prealloc |
| 136 | * list. In case of inode preallocation we follow a list of heuristics |
| 137 | * based on file size. This can be found in ext4_mb_normalize_request. If |
| 138 | * we are doing a group prealloc we try to normalize the request to |
Theodore Ts'o | 27baebb | 2011-09-09 19:02:51 -0400 | [diff] [blame] | 139 | * sbi->s_mb_group_prealloc. The default value of s_mb_group_prealloc is |
| 140 | * dependent on the cluster size; for non-bigalloc file systems, it is |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 141 | * 512 blocks. This can be tuned via |
Dan Ehrenberg | d7a1fee | 2011-07-17 21:11:30 -0400 | [diff] [blame] | 142 | * /sys/fs/ext4/<partition>/mb_group_prealloc. The value is represented in |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 143 | * terms of number of blocks. If we have mounted the file system with -O |
| 144 | * stripe=<value> option the group prealloc request is normalized to the |
Dan Ehrenberg | d7a1fee | 2011-07-17 21:11:30 -0400 | [diff] [blame] | 145 | * the smallest multiple of the stripe value (sbi->s_stripe) which is |
| 146 | * greater than the default mb_group_prealloc. |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 147 | * |
Dan Ehrenberg | d7a1fee | 2011-07-17 21:11:30 -0400 | [diff] [blame] | 148 | * The regular allocator (using the buddy cache) supports a few tunables. |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 149 | * |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 150 | * /sys/fs/ext4/<partition>/mb_min_to_scan |
| 151 | * /sys/fs/ext4/<partition>/mb_max_to_scan |
| 152 | * /sys/fs/ext4/<partition>/mb_order2_req |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 153 | * |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 154 | * The regular allocator uses buddy scan only if the request len is power of |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 155 | * 2 blocks and the order of allocation is >= sbi->s_mb_order2_reqs. The |
| 156 | * value of s_mb_order2_reqs can be tuned via |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 157 | * /sys/fs/ext4/<partition>/mb_order2_req. If the request len is equal to |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 158 | * stripe size (sbi->s_stripe), we try to search for contiguous block in |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 159 | * stripe size. This should result in better allocation on RAID setups. If |
| 160 | * not, we search in the specific group using bitmap for best extents. The |
| 161 | * tunable min_to_scan and max_to_scan control the behaviour here. |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 162 | * min_to_scan indicate how long the mballoc __must__ look for a best |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 163 | * extent and max_to_scan indicates how long the mballoc __can__ look for a |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 164 | * best extent in the found extents. Searching for the blocks starts with |
| 165 | * the group specified as the goal value in allocation context via |
| 166 | * ac_g_ex. Each group is first checked based on the criteria whether it |
Tao Ma | caaf7a2 | 2011-07-11 18:42:42 -0400 | [diff] [blame] | 167 | * can be used for allocation. ext4_mb_good_group explains how the groups are |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 168 | * checked. |
| 169 | * |
| 170 | * Both the prealloc space are getting populated as above. So for the first |
| 171 | * request we will hit the buddy cache which will result in this prealloc |
| 172 | * space getting filled. The prealloc space is then later used for the |
| 173 | * subsequent request. |
| 174 | */ |
| 175 | |
| 176 | /* |
| 177 | * mballoc operates on the following data: |
| 178 | * - on-disk bitmap |
| 179 | * - in-core buddy (actually includes buddy and bitmap) |
| 180 | * - preallocation descriptors (PAs) |
| 181 | * |
| 182 | * there are two types of preallocations: |
| 183 | * - inode |
| 184 | * assiged to specific inode and can be used for this inode only. |
| 185 | * it describes part of inode's space preallocated to specific |
| 186 | * physical blocks. any block from that preallocated can be used |
| 187 | * independent. the descriptor just tracks number of blocks left |
| 188 | * unused. so, before taking some block from descriptor, one must |
| 189 | * make sure corresponded logical block isn't allocated yet. this |
| 190 | * also means that freeing any block within descriptor's range |
| 191 | * must discard all preallocated blocks. |
| 192 | * - locality group |
| 193 | * assigned to specific locality group which does not translate to |
| 194 | * permanent set of inodes: inode can join and leave group. space |
| 195 | * from this type of preallocation can be used for any inode. thus |
| 196 | * it's consumed from the beginning to the end. |
| 197 | * |
| 198 | * relation between them can be expressed as: |
| 199 | * in-core buddy = on-disk bitmap + preallocation descriptors |
| 200 | * |
| 201 | * this mean blocks mballoc considers used are: |
| 202 | * - allocated blocks (persistent) |
| 203 | * - preallocated blocks (non-persistent) |
| 204 | * |
| 205 | * consistency in mballoc world means that at any time a block is either |
| 206 | * free or used in ALL structures. notice: "any time" should not be read |
| 207 | * literally -- time is discrete and delimited by locks. |
| 208 | * |
| 209 | * to keep it simple, we don't use block numbers, instead we count number of |
| 210 | * blocks: how many blocks marked used/free in on-disk bitmap, buddy and PA. |
| 211 | * |
| 212 | * all operations can be expressed as: |
| 213 | * - init buddy: buddy = on-disk + PAs |
| 214 | * - new PA: buddy += N; PA = N |
| 215 | * - use inode PA: on-disk += N; PA -= N |
| 216 | * - discard inode PA buddy -= on-disk - PA; PA = 0 |
| 217 | * - use locality group PA on-disk += N; PA -= N |
| 218 | * - discard locality group PA buddy -= PA; PA = 0 |
| 219 | * note: 'buddy -= on-disk - PA' is used to show that on-disk bitmap |
| 220 | * is used in real operation because we can't know actual used |
| 221 | * bits from PA, only from on-disk bitmap |
| 222 | * |
| 223 | * if we follow this strict logic, then all operations above should be atomic. |
| 224 | * given some of them can block, we'd have to use something like semaphores |
| 225 | * killing performance on high-end SMP hardware. let's try to relax it using |
| 226 | * the following knowledge: |
| 227 | * 1) if buddy is referenced, it's already initialized |
| 228 | * 2) while block is used in buddy and the buddy is referenced, |
| 229 | * nobody can re-allocate that block |
| 230 | * 3) we work on bitmaps and '+' actually means 'set bits'. if on-disk has |
| 231 | * bit set and PA claims same block, it's OK. IOW, one can set bit in |
| 232 | * on-disk bitmap if buddy has same bit set or/and PA covers corresponded |
| 233 | * block |
| 234 | * |
| 235 | * so, now we're building a concurrency table: |
| 236 | * - init buddy vs. |
| 237 | * - new PA |
| 238 | * blocks for PA are allocated in the buddy, buddy must be referenced |
| 239 | * until PA is linked to allocation group to avoid concurrent buddy init |
| 240 | * - use inode PA |
| 241 | * we need to make sure that either on-disk bitmap or PA has uptodate data |
| 242 | * given (3) we care that PA-=N operation doesn't interfere with init |
| 243 | * - discard inode PA |
| 244 | * the simplest way would be to have buddy initialized by the discard |
| 245 | * - use locality group PA |
| 246 | * again PA-=N must be serialized with init |
| 247 | * - discard locality group PA |
| 248 | * the simplest way would be to have buddy initialized by the discard |
| 249 | * - new PA vs. |
| 250 | * - use inode PA |
| 251 | * i_data_sem serializes them |
| 252 | * - discard inode PA |
| 253 | * discard process must wait until PA isn't used by another process |
| 254 | * - use locality group PA |
| 255 | * some mutex should serialize them |
| 256 | * - discard locality group PA |
| 257 | * discard process must wait until PA isn't used by another process |
| 258 | * - use inode PA |
| 259 | * - use inode PA |
| 260 | * i_data_sem or another mutex should serializes them |
| 261 | * - discard inode PA |
| 262 | * discard process must wait until PA isn't used by another process |
| 263 | * - use locality group PA |
| 264 | * nothing wrong here -- they're different PAs covering different blocks |
| 265 | * - discard locality group PA |
| 266 | * discard process must wait until PA isn't used by another process |
| 267 | * |
| 268 | * now we're ready to make few consequences: |
| 269 | * - PA is referenced and while it is no discard is possible |
| 270 | * - PA is referenced until block isn't marked in on-disk bitmap |
| 271 | * - PA changes only after on-disk bitmap |
| 272 | * - discard must not compete with init. either init is done before |
| 273 | * any discard or they're serialized somehow |
| 274 | * - buddy init as sum of on-disk bitmap and PAs is done atomically |
| 275 | * |
| 276 | * a special case when we've used PA to emptiness. no need to modify buddy |
| 277 | * in this case, but we should care about concurrent init |
| 278 | * |
| 279 | */ |
| 280 | |
| 281 | /* |
| 282 | * Logic in few words: |
| 283 | * |
| 284 | * - allocation: |
| 285 | * load group |
| 286 | * find blocks |
| 287 | * mark bits in on-disk bitmap |
| 288 | * release group |
| 289 | * |
| 290 | * - use preallocation: |
| 291 | * find proper PA (per-inode or group) |
| 292 | * load group |
| 293 | * mark bits in on-disk bitmap |
| 294 | * release group |
| 295 | * release PA |
| 296 | * |
| 297 | * - free: |
| 298 | * load group |
| 299 | * mark bits in on-disk bitmap |
| 300 | * release group |
| 301 | * |
| 302 | * - discard preallocations in group: |
| 303 | * mark PAs deleted |
| 304 | * move them onto local list |
| 305 | * load on-disk bitmap |
| 306 | * load group |
| 307 | * remove PA from object (inode or locality group) |
| 308 | * mark free blocks in-core |
| 309 | * |
| 310 | * - discard inode's preallocations: |
| 311 | */ |
| 312 | |
| 313 | /* |
| 314 | * Locking rules |
| 315 | * |
| 316 | * Locks: |
| 317 | * - bitlock on a group (group) |
| 318 | * - object (inode/locality) (object) |
| 319 | * - per-pa lock (pa) |
| 320 | * |
| 321 | * Paths: |
| 322 | * - new pa |
| 323 | * object |
| 324 | * group |
| 325 | * |
| 326 | * - find and use pa: |
| 327 | * pa |
| 328 | * |
| 329 | * - release consumed pa: |
| 330 | * pa |
| 331 | * group |
| 332 | * object |
| 333 | * |
| 334 | * - generate in-core bitmap: |
| 335 | * group |
| 336 | * pa |
| 337 | * |
| 338 | * - discard all for given object (inode, locality group): |
| 339 | * object |
| 340 | * pa |
| 341 | * group |
| 342 | * |
| 343 | * - discard all for given group: |
| 344 | * group |
| 345 | * pa |
| 346 | * group |
| 347 | * object |
| 348 | * |
| 349 | */ |
Aneesh Kumar K.V | c3a326a | 2008-11-25 15:11:52 -0500 | [diff] [blame] | 350 | static struct kmem_cache *ext4_pspace_cachep; |
| 351 | static struct kmem_cache *ext4_ac_cachep; |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 352 | static struct kmem_cache *ext4_free_data_cachep; |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 353 | |
| 354 | /* We create slab caches for groupinfo data structures based on the |
| 355 | * superblock block size. There will be one per mounted filesystem for |
| 356 | * each unique s_blocksize_bits */ |
Eric Sandeen | 2892c15 | 2011-02-12 08:12:18 -0500 | [diff] [blame] | 357 | #define NR_GRPINFO_CACHES 8 |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 358 | static struct kmem_cache *ext4_groupinfo_caches[NR_GRPINFO_CACHES]; |
| 359 | |
Eric Biggers | d600618 | 2017-04-29 23:47:50 -0400 | [diff] [blame] | 360 | static const char * const ext4_groupinfo_slab_names[NR_GRPINFO_CACHES] = { |
Eric Sandeen | 2892c15 | 2011-02-12 08:12:18 -0500 | [diff] [blame] | 361 | "ext4_groupinfo_1k", "ext4_groupinfo_2k", "ext4_groupinfo_4k", |
| 362 | "ext4_groupinfo_8k", "ext4_groupinfo_16k", "ext4_groupinfo_32k", |
| 363 | "ext4_groupinfo_64k", "ext4_groupinfo_128k" |
| 364 | }; |
| 365 | |
Aneesh Kumar K.V | c3a326a | 2008-11-25 15:11:52 -0500 | [diff] [blame] | 366 | static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, |
| 367 | ext4_group_t group); |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 368 | static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap, |
| 369 | ext4_group_t group); |
Aneesh Kumar K.V | c3a326a | 2008-11-25 15:11:52 -0500 | [diff] [blame] | 370 | |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 371 | static inline void *mb_correct_addr_and_bit(int *bit, void *addr) |
| 372 | { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 373 | #if BITS_PER_LONG == 64 |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 374 | *bit += ((unsigned long) addr & 7UL) << 3; |
| 375 | addr = (void *) ((unsigned long) addr & ~7UL); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 376 | #elif BITS_PER_LONG == 32 |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 377 | *bit += ((unsigned long) addr & 3UL) << 3; |
| 378 | addr = (void *) ((unsigned long) addr & ~3UL); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 379 | #else |
| 380 | #error "how many bits you are?!" |
| 381 | #endif |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 382 | return addr; |
| 383 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 384 | |
| 385 | static inline int mb_test_bit(int bit, void *addr) |
| 386 | { |
| 387 | /* |
| 388 | * ext4_test_bit on architecture like powerpc |
| 389 | * needs unsigned long aligned address |
| 390 | */ |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 391 | addr = mb_correct_addr_and_bit(&bit, addr); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 392 | return ext4_test_bit(bit, addr); |
| 393 | } |
| 394 | |
| 395 | static inline void mb_set_bit(int bit, void *addr) |
| 396 | { |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 397 | addr = mb_correct_addr_and_bit(&bit, addr); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 398 | ext4_set_bit(bit, addr); |
| 399 | } |
| 400 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 401 | static inline void mb_clear_bit(int bit, void *addr) |
| 402 | { |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 403 | addr = mb_correct_addr_and_bit(&bit, addr); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 404 | ext4_clear_bit(bit, addr); |
| 405 | } |
| 406 | |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 407 | static inline int mb_test_and_clear_bit(int bit, void *addr) |
| 408 | { |
| 409 | addr = mb_correct_addr_and_bit(&bit, addr); |
| 410 | return ext4_test_and_clear_bit(bit, addr); |
| 411 | } |
| 412 | |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 413 | static inline int mb_find_next_zero_bit(void *addr, int max, int start) |
| 414 | { |
Aneesh Kumar K.V | e7dfb24 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 415 | int fix = 0, ret, tmpmax; |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 416 | addr = mb_correct_addr_and_bit(&fix, addr); |
Aneesh Kumar K.V | e7dfb24 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 417 | tmpmax = max + fix; |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 418 | start += fix; |
| 419 | |
Aneesh Kumar K.V | e7dfb24 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 420 | ret = ext4_find_next_zero_bit(addr, tmpmax, start) - fix; |
| 421 | if (ret > max) |
| 422 | return max; |
| 423 | return ret; |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | static inline int mb_find_next_bit(void *addr, int max, int start) |
| 427 | { |
Aneesh Kumar K.V | e7dfb24 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 428 | int fix = 0, ret, tmpmax; |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 429 | addr = mb_correct_addr_and_bit(&fix, addr); |
Aneesh Kumar K.V | e7dfb24 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 430 | tmpmax = max + fix; |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 431 | start += fix; |
| 432 | |
Aneesh Kumar K.V | e7dfb24 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 433 | ret = ext4_find_next_bit(addr, tmpmax, start) - fix; |
| 434 | if (ret > max) |
| 435 | return max; |
| 436 | return ret; |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 437 | } |
| 438 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 439 | static void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max) |
| 440 | { |
| 441 | char *bb; |
| 442 | |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 443 | BUG_ON(e4b->bd_bitmap == e4b->bd_buddy); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 444 | BUG_ON(max == NULL); |
| 445 | |
| 446 | if (order > e4b->bd_blkbits + 1) { |
| 447 | *max = 0; |
| 448 | return NULL; |
| 449 | } |
| 450 | |
| 451 | /* at order 0 we see each particular block */ |
Coly Li | 84b775a | 2011-02-24 12:51:59 -0500 | [diff] [blame] | 452 | if (order == 0) { |
| 453 | *max = 1 << (e4b->bd_blkbits + 3); |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 454 | return e4b->bd_bitmap; |
Coly Li | 84b775a | 2011-02-24 12:51:59 -0500 | [diff] [blame] | 455 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 456 | |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 457 | bb = e4b->bd_buddy + EXT4_SB(e4b->bd_sb)->s_mb_offsets[order]; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 458 | *max = EXT4_SB(e4b->bd_sb)->s_mb_maxs[order]; |
| 459 | |
| 460 | return bb; |
| 461 | } |
| 462 | |
| 463 | #ifdef DOUBLE_CHECK |
| 464 | static void mb_free_blocks_double(struct inode *inode, struct ext4_buddy *e4b, |
| 465 | int first, int count) |
| 466 | { |
| 467 | int i; |
| 468 | struct super_block *sb = e4b->bd_sb; |
| 469 | |
| 470 | if (unlikely(e4b->bd_info->bb_bitmap == NULL)) |
| 471 | return; |
Vincent Minet | bc8e674 | 2009-05-15 08:33:18 -0400 | [diff] [blame] | 472 | assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 473 | for (i = 0; i < count; i++) { |
| 474 | if (!mb_test_bit(first + i, e4b->bd_info->bb_bitmap)) { |
| 475 | ext4_fsblk_t blocknr; |
Akinobu Mita | 5661bd6 | 2010-03-03 23:53:39 -0500 | [diff] [blame] | 476 | |
| 477 | blocknr = ext4_group_first_block_no(sb, e4b->bd_group); |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 478 | blocknr += EXT4_C2B(EXT4_SB(sb), first + i); |
Aneesh Kumar K.V | 5d1b1b3 | 2009-01-05 22:19:52 -0500 | [diff] [blame] | 479 | ext4_grp_locked_error(sb, e4b->bd_group, |
Theodore Ts'o | e29136f | 2010-06-29 12:54:28 -0400 | [diff] [blame] | 480 | inode ? inode->i_ino : 0, |
| 481 | blocknr, |
| 482 | "freeing block already freed " |
| 483 | "(bit %u)", |
| 484 | first + i); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 485 | } |
| 486 | mb_clear_bit(first + i, e4b->bd_info->bb_bitmap); |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | static void mb_mark_used_double(struct ext4_buddy *e4b, int first, int count) |
| 491 | { |
| 492 | int i; |
| 493 | |
| 494 | if (unlikely(e4b->bd_info->bb_bitmap == NULL)) |
| 495 | return; |
Vincent Minet | bc8e674 | 2009-05-15 08:33:18 -0400 | [diff] [blame] | 496 | assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 497 | for (i = 0; i < count; i++) { |
| 498 | BUG_ON(mb_test_bit(first + i, e4b->bd_info->bb_bitmap)); |
| 499 | mb_set_bit(first + i, e4b->bd_info->bb_bitmap); |
| 500 | } |
| 501 | } |
| 502 | |
| 503 | static void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap) |
| 504 | { |
| 505 | if (memcmp(e4b->bd_info->bb_bitmap, bitmap, e4b->bd_sb->s_blocksize)) { |
| 506 | unsigned char *b1, *b2; |
| 507 | int i; |
| 508 | b1 = (unsigned char *) e4b->bd_info->bb_bitmap; |
| 509 | b2 = (unsigned char *) bitmap; |
| 510 | for (i = 0; i < e4b->bd_sb->s_blocksize; i++) { |
| 511 | if (b1[i] != b2[i]) { |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 512 | ext4_msg(e4b->bd_sb, KERN_ERR, |
| 513 | "corruption in group %u " |
| 514 | "at byte %u(%u): %x in copy != %x " |
| 515 | "on disk/prealloc", |
| 516 | e4b->bd_group, i, i * 8, b1[i], b2[i]); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 517 | BUG(); |
| 518 | } |
| 519 | } |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | #else |
| 524 | static inline void mb_free_blocks_double(struct inode *inode, |
| 525 | struct ext4_buddy *e4b, int first, int count) |
| 526 | { |
| 527 | return; |
| 528 | } |
| 529 | static inline void mb_mark_used_double(struct ext4_buddy *e4b, |
| 530 | int first, int count) |
| 531 | { |
| 532 | return; |
| 533 | } |
| 534 | static inline void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap) |
| 535 | { |
| 536 | return; |
| 537 | } |
| 538 | #endif |
| 539 | |
| 540 | #ifdef AGGRESSIVE_CHECK |
| 541 | |
| 542 | #define MB_CHECK_ASSERT(assert) \ |
| 543 | do { \ |
| 544 | if (!(assert)) { \ |
| 545 | printk(KERN_EMERG \ |
| 546 | "Assertion failure in %s() at %s:%d: \"%s\"\n", \ |
| 547 | function, file, line, # assert); \ |
| 548 | BUG(); \ |
| 549 | } \ |
| 550 | } while (0) |
| 551 | |
| 552 | static int __mb_check_buddy(struct ext4_buddy *e4b, char *file, |
| 553 | const char *function, int line) |
| 554 | { |
| 555 | struct super_block *sb = e4b->bd_sb; |
| 556 | int order = e4b->bd_blkbits + 1; |
| 557 | int max; |
| 558 | int max2; |
| 559 | int i; |
| 560 | int j; |
| 561 | int k; |
| 562 | int count; |
| 563 | struct ext4_group_info *grp; |
| 564 | int fragments = 0; |
| 565 | int fstart; |
| 566 | struct list_head *cur; |
| 567 | void *buddy; |
| 568 | void *buddy2; |
| 569 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 570 | { |
| 571 | static int mb_check_counter; |
| 572 | if (mb_check_counter++ % 100 != 0) |
| 573 | return 0; |
| 574 | } |
| 575 | |
| 576 | while (order > 1) { |
| 577 | buddy = mb_find_buddy(e4b, order, &max); |
| 578 | MB_CHECK_ASSERT(buddy); |
| 579 | buddy2 = mb_find_buddy(e4b, order - 1, &max2); |
| 580 | MB_CHECK_ASSERT(buddy2); |
| 581 | MB_CHECK_ASSERT(buddy != buddy2); |
| 582 | MB_CHECK_ASSERT(max * 2 == max2); |
| 583 | |
| 584 | count = 0; |
| 585 | for (i = 0; i < max; i++) { |
| 586 | |
| 587 | if (mb_test_bit(i, buddy)) { |
| 588 | /* only single bit in buddy2 may be 1 */ |
| 589 | if (!mb_test_bit(i << 1, buddy2)) { |
| 590 | MB_CHECK_ASSERT( |
| 591 | mb_test_bit((i<<1)+1, buddy2)); |
| 592 | } else if (!mb_test_bit((i << 1) + 1, buddy2)) { |
| 593 | MB_CHECK_ASSERT( |
| 594 | mb_test_bit(i << 1, buddy2)); |
| 595 | } |
| 596 | continue; |
| 597 | } |
| 598 | |
Robin Dong | 0a10da7 | 2011-10-26 08:48:54 -0400 | [diff] [blame] | 599 | /* both bits in buddy2 must be 1 */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 600 | MB_CHECK_ASSERT(mb_test_bit(i << 1, buddy2)); |
| 601 | MB_CHECK_ASSERT(mb_test_bit((i << 1) + 1, buddy2)); |
| 602 | |
| 603 | for (j = 0; j < (1 << order); j++) { |
| 604 | k = (i * (1 << order)) + j; |
| 605 | MB_CHECK_ASSERT( |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 606 | !mb_test_bit(k, e4b->bd_bitmap)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 607 | } |
| 608 | count++; |
| 609 | } |
| 610 | MB_CHECK_ASSERT(e4b->bd_info->bb_counters[order] == count); |
| 611 | order--; |
| 612 | } |
| 613 | |
| 614 | fstart = -1; |
| 615 | buddy = mb_find_buddy(e4b, 0, &max); |
| 616 | for (i = 0; i < max; i++) { |
| 617 | if (!mb_test_bit(i, buddy)) { |
| 618 | MB_CHECK_ASSERT(i >= e4b->bd_info->bb_first_free); |
| 619 | if (fstart == -1) { |
| 620 | fragments++; |
| 621 | fstart = i; |
| 622 | } |
| 623 | continue; |
| 624 | } |
| 625 | fstart = -1; |
| 626 | /* check used bits only */ |
| 627 | for (j = 0; j < e4b->bd_blkbits + 1; j++) { |
| 628 | buddy2 = mb_find_buddy(e4b, j, &max2); |
| 629 | k = i >> j; |
| 630 | MB_CHECK_ASSERT(k < max2); |
| 631 | MB_CHECK_ASSERT(mb_test_bit(k, buddy2)); |
| 632 | } |
| 633 | } |
| 634 | MB_CHECK_ASSERT(!EXT4_MB_GRP_NEED_INIT(e4b->bd_info)); |
| 635 | MB_CHECK_ASSERT(e4b->bd_info->bb_fragments == fragments); |
| 636 | |
| 637 | grp = ext4_get_group_info(sb, e4b->bd_group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 638 | list_for_each(cur, &grp->bb_prealloc_list) { |
| 639 | ext4_group_t groupnr; |
| 640 | struct ext4_prealloc_space *pa; |
Solofo Ramangalahy | 60bd63d | 2008-04-29 21:59:59 -0400 | [diff] [blame] | 641 | pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list); |
| 642 | ext4_get_group_no_and_offset(sb, pa->pa_pstart, &groupnr, &k); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 643 | MB_CHECK_ASSERT(groupnr == e4b->bd_group); |
Solofo Ramangalahy | 60bd63d | 2008-04-29 21:59:59 -0400 | [diff] [blame] | 644 | for (i = 0; i < pa->pa_len; i++) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 645 | MB_CHECK_ASSERT(mb_test_bit(k + i, buddy)); |
| 646 | } |
| 647 | return 0; |
| 648 | } |
| 649 | #undef MB_CHECK_ASSERT |
| 650 | #define mb_check_buddy(e4b) __mb_check_buddy(e4b, \ |
Harvey Harrison | 46e665e | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 651 | __FILE__, __func__, __LINE__) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 652 | #else |
| 653 | #define mb_check_buddy(e4b) |
| 654 | #endif |
| 655 | |
Coly Li | 7c78605 | 2011-02-24 13:24:25 -0500 | [diff] [blame] | 656 | /* |
| 657 | * Divide blocks started from @first with length @len into |
| 658 | * smaller chunks with power of 2 blocks. |
| 659 | * Clear the bits in bitmap which the blocks of the chunk(s) covered, |
| 660 | * then increase bb_counters[] for corresponded chunk size. |
| 661 | */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 662 | static void ext4_mb_mark_free_simple(struct super_block *sb, |
Eric Sandeen | a36b449 | 2009-08-25 22:36:45 -0400 | [diff] [blame] | 663 | void *buddy, ext4_grpblk_t first, ext4_grpblk_t len, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 664 | struct ext4_group_info *grp) |
| 665 | { |
| 666 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Eric Sandeen | a36b449 | 2009-08-25 22:36:45 -0400 | [diff] [blame] | 667 | ext4_grpblk_t min; |
| 668 | ext4_grpblk_t max; |
| 669 | ext4_grpblk_t chunk; |
Chandan Rajendra | 69e43e8 | 2016-11-14 21:04:37 -0500 | [diff] [blame] | 670 | unsigned int border; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 671 | |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 672 | BUG_ON(len > EXT4_CLUSTERS_PER_GROUP(sb)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 673 | |
| 674 | border = 2 << sb->s_blocksize_bits; |
| 675 | |
| 676 | while (len > 0) { |
| 677 | /* find how many blocks can be covered since this position */ |
| 678 | max = ffs(first | border) - 1; |
| 679 | |
| 680 | /* find how many blocks of power 2 we need to mark */ |
| 681 | min = fls(len) - 1; |
| 682 | |
| 683 | if (max < min) |
| 684 | min = max; |
| 685 | chunk = 1 << min; |
| 686 | |
| 687 | /* mark multiblock chunks only */ |
| 688 | grp->bb_counters[min]++; |
| 689 | if (min > 0) |
| 690 | mb_clear_bit(first >> min, |
| 691 | buddy + sbi->s_mb_offsets[min]); |
| 692 | |
| 693 | len -= chunk; |
| 694 | first += chunk; |
| 695 | } |
| 696 | } |
| 697 | |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 698 | /* |
| 699 | * Cache the order of the largest free extent we have available in this block |
| 700 | * group. |
| 701 | */ |
| 702 | static void |
| 703 | mb_set_largest_free_order(struct super_block *sb, struct ext4_group_info *grp) |
| 704 | { |
| 705 | int i; |
| 706 | int bits; |
| 707 | |
| 708 | grp->bb_largest_free_order = -1; /* uninit */ |
| 709 | |
| 710 | bits = sb->s_blocksize_bits + 1; |
| 711 | for (i = bits; i >= 0; i--) { |
| 712 | if (grp->bb_counters[i] > 0) { |
| 713 | grp->bb_largest_free_order = i; |
| 714 | break; |
| 715 | } |
| 716 | } |
| 717 | } |
| 718 | |
Eric Sandeen | 089ceec | 2009-07-05 22:17:31 -0400 | [diff] [blame] | 719 | static noinline_for_stack |
| 720 | void ext4_mb_generate_buddy(struct super_block *sb, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 721 | void *buddy, void *bitmap, ext4_group_t group) |
| 722 | { |
| 723 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); |
Namjae Jeon | e43bb4e | 2014-06-26 10:11:53 -0400 | [diff] [blame] | 724 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 725 | ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb); |
Eric Sandeen | a36b449 | 2009-08-25 22:36:45 -0400 | [diff] [blame] | 726 | ext4_grpblk_t i = 0; |
| 727 | ext4_grpblk_t first; |
| 728 | ext4_grpblk_t len; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 729 | unsigned free = 0; |
| 730 | unsigned fragments = 0; |
| 731 | unsigned long long period = get_cycles(); |
| 732 | |
| 733 | /* initialize buddy from bitmap which is aggregation |
| 734 | * of on-disk bitmap and preallocations */ |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 735 | i = mb_find_next_zero_bit(bitmap, max, 0); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 736 | grp->bb_first_free = i; |
| 737 | while (i < max) { |
| 738 | fragments++; |
| 739 | first = i; |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 740 | i = mb_find_next_bit(bitmap, max, i); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 741 | len = i - first; |
| 742 | free += len; |
| 743 | if (len > 1) |
| 744 | ext4_mb_mark_free_simple(sb, buddy, first, len, grp); |
| 745 | else |
| 746 | grp->bb_counters[0]++; |
| 747 | if (i < max) |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 748 | i = mb_find_next_zero_bit(bitmap, max, i); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 749 | } |
| 750 | grp->bb_fragments = fragments; |
| 751 | |
| 752 | if (free != grp->bb_free) { |
Theodore Ts'o | e29136f | 2010-06-29 12:54:28 -0400 | [diff] [blame] | 753 | ext4_grp_locked_error(sb, group, 0, 0, |
Theodore Ts'o | 94d4c06 | 2014-07-05 19:15:50 -0400 | [diff] [blame] | 754 | "block bitmap and bg descriptor " |
| 755 | "inconsistent: %u vs %u free clusters", |
Theodore Ts'o | e29136f | 2010-06-29 12:54:28 -0400 | [diff] [blame] | 756 | free, grp->bb_free); |
Aneesh Kumar K.V | e56eb65 | 2008-02-15 13:48:21 -0500 | [diff] [blame] | 757 | /* |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 758 | * If we intend to continue, we consider group descriptor |
Aneesh Kumar K.V | e56eb65 | 2008-02-15 13:48:21 -0500 | [diff] [blame] | 759 | * corrupt and update bb_free using bitmap value |
| 760 | */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 761 | grp->bb_free = free; |
Namjae Jeon | e43bb4e | 2014-06-26 10:11:53 -0400 | [diff] [blame] | 762 | if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) |
| 763 | percpu_counter_sub(&sbi->s_freeclusters_counter, |
| 764 | grp->bb_free); |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 765 | set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 766 | } |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 767 | mb_set_largest_free_order(sb, grp); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 768 | |
| 769 | clear_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state)); |
| 770 | |
| 771 | period = get_cycles() - period; |
| 772 | spin_lock(&EXT4_SB(sb)->s_bal_lock); |
| 773 | EXT4_SB(sb)->s_mb_buddies_generated++; |
| 774 | EXT4_SB(sb)->s_mb_generation_time += period; |
| 775 | spin_unlock(&EXT4_SB(sb)->s_bal_lock); |
| 776 | } |
| 777 | |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 778 | static void mb_regenerate_buddy(struct ext4_buddy *e4b) |
| 779 | { |
| 780 | int count; |
| 781 | int order = 1; |
| 782 | void *buddy; |
| 783 | |
| 784 | while ((buddy = mb_find_buddy(e4b, order++, &count))) { |
| 785 | ext4_set_bits(buddy, 0, count); |
| 786 | } |
| 787 | e4b->bd_info->bb_fragments = 0; |
| 788 | memset(e4b->bd_info->bb_counters, 0, |
| 789 | sizeof(*e4b->bd_info->bb_counters) * |
| 790 | (e4b->bd_sb->s_blocksize_bits + 2)); |
| 791 | |
| 792 | ext4_mb_generate_buddy(e4b->bd_sb, e4b->bd_buddy, |
| 793 | e4b->bd_bitmap, e4b->bd_group); |
| 794 | } |
| 795 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 796 | /* The buddy information is attached the buddy cache inode |
| 797 | * for convenience. The information regarding each group |
| 798 | * is loaded via ext4_mb_load_buddy. The information involve |
| 799 | * block bitmap and buddy information. The information are |
| 800 | * stored in the inode as |
| 801 | * |
| 802 | * { page } |
Aneesh Kumar K.V | c3a326a | 2008-11-25 15:11:52 -0500 | [diff] [blame] | 803 | * [ group 0 bitmap][ group 0 buddy] [group 1][ group 1]... |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 804 | * |
| 805 | * |
| 806 | * one block each for bitmap and buddy information. |
| 807 | * So for each group we take up 2 blocks. A page can |
Kirill A. Shutemov | ea1754a | 2016-04-01 15:29:48 +0300 | [diff] [blame] | 808 | * contain blocks_per_page (PAGE_SIZE / blocksize) blocks. |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 809 | * So it can have information regarding groups_per_page which |
| 810 | * is blocks_per_page/2 |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 811 | * |
| 812 | * Locking note: This routine takes the block group lock of all groups |
| 813 | * for this page; do not hold this lock when calling this routine! |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 814 | */ |
| 815 | |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 816 | static int ext4_mb_init_cache(struct page *page, char *incore, gfp_t gfp) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 817 | { |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 818 | ext4_group_t ngroups; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 819 | int blocksize; |
| 820 | int blocks_per_page; |
| 821 | int groups_per_page; |
| 822 | int err = 0; |
| 823 | int i; |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 824 | ext4_group_t first_group, group; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 825 | int first_block; |
| 826 | struct super_block *sb; |
| 827 | struct buffer_head *bhs; |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 828 | struct buffer_head **bh = NULL; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 829 | struct inode *inode; |
| 830 | char *data; |
| 831 | char *bitmap; |
Amir Goldstein | 9b8b7d3 | 2011-05-09 21:49:42 -0400 | [diff] [blame] | 832 | struct ext4_group_info *grinfo; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 833 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 834 | mb_debug(1, "init page %lu\n", page->index); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 835 | |
| 836 | inode = page->mapping->host; |
| 837 | sb = inode->i_sb; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 838 | ngroups = ext4_get_groups_count(sb); |
Fabian Frederick | 9340747 | 2017-02-27 14:28:32 -0800 | [diff] [blame] | 839 | blocksize = i_blocksize(inode); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 840 | blocks_per_page = PAGE_SIZE / blocksize; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 841 | |
| 842 | groups_per_page = blocks_per_page >> 1; |
| 843 | if (groups_per_page == 0) |
| 844 | groups_per_page = 1; |
| 845 | |
| 846 | /* allocate buffer_heads to read bitmaps */ |
| 847 | if (groups_per_page > 1) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 848 | i = sizeof(struct buffer_head *) * groups_per_page; |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 849 | bh = kzalloc(i, gfp); |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 850 | if (bh == NULL) { |
| 851 | err = -ENOMEM; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 852 | goto out; |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 853 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 854 | } else |
| 855 | bh = &bhs; |
| 856 | |
| 857 | first_group = page->index * blocks_per_page / 2; |
| 858 | |
| 859 | /* read all groups the page covers into the cache */ |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 860 | for (i = 0, group = first_group; i < groups_per_page; i++, group++) { |
| 861 | if (group >= ngroups) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 862 | break; |
| 863 | |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 864 | grinfo = ext4_get_group_info(sb, group); |
Amir Goldstein | 9b8b7d3 | 2011-05-09 21:49:42 -0400 | [diff] [blame] | 865 | /* |
| 866 | * If page is uptodate then we came here after online resize |
| 867 | * which added some new uninitialized group info structs, so |
| 868 | * we must skip all initialized uptodate buddies on the page, |
| 869 | * which may be currently in use by an allocating task. |
| 870 | */ |
| 871 | if (PageUptodate(page) && !EXT4_MB_GRP_NEED_INIT(grinfo)) { |
| 872 | bh[i] = NULL; |
| 873 | continue; |
| 874 | } |
Darrick J. Wong | 9008a58 | 2015-10-17 21:33:24 -0400 | [diff] [blame] | 875 | bh[i] = ext4_read_block_bitmap_nowait(sb, group); |
| 876 | if (IS_ERR(bh[i])) { |
| 877 | err = PTR_ERR(bh[i]); |
| 878 | bh[i] = NULL; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 879 | goto out; |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 880 | } |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 881 | mb_debug(1, "read bitmap for group %u\n", group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 882 | } |
| 883 | |
| 884 | /* wait for I/O completion */ |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 885 | for (i = 0, group = first_group; i < groups_per_page; i++, group++) { |
Darrick J. Wong | 9008a58 | 2015-10-17 21:33:24 -0400 | [diff] [blame] | 886 | int err2; |
| 887 | |
| 888 | if (!bh[i]) |
| 889 | continue; |
| 890 | err2 = ext4_wait_block_bitmap(sb, group, bh[i]); |
| 891 | if (!err) |
| 892 | err = err2; |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 893 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 894 | |
| 895 | first_block = page->index * blocks_per_page; |
| 896 | for (i = 0; i < blocks_per_page; i++) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 897 | group = (first_block + i) >> 1; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 898 | if (group >= ngroups) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 899 | break; |
| 900 | |
Amir Goldstein | 9b8b7d3 | 2011-05-09 21:49:42 -0400 | [diff] [blame] | 901 | if (!bh[group - first_group]) |
| 902 | /* skip initialized uptodate buddy */ |
| 903 | continue; |
| 904 | |
Lukas Czerner | bbdc322 | 2015-06-08 11:38:37 -0400 | [diff] [blame] | 905 | if (!buffer_verified(bh[group - first_group])) |
| 906 | /* Skip faulty bitmaps */ |
| 907 | continue; |
| 908 | err = 0; |
| 909 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 910 | /* |
| 911 | * data carry information regarding this |
| 912 | * particular group in the format specified |
| 913 | * above |
| 914 | * |
| 915 | */ |
| 916 | data = page_address(page) + (i * blocksize); |
| 917 | bitmap = bh[group - first_group]->b_data; |
| 918 | |
| 919 | /* |
| 920 | * We place the buddy block and bitmap block |
| 921 | * close together |
| 922 | */ |
| 923 | if ((first_block + i) & 1) { |
| 924 | /* this is block of buddy */ |
| 925 | BUG_ON(incore == NULL); |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 926 | mb_debug(1, "put buddy for group %u in page %lu/%x\n", |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 927 | group, page->index, i * blocksize); |
Theodore Ts'o | f307333 | 2010-05-17 03:00:00 -0400 | [diff] [blame] | 928 | trace_ext4_mb_buddy_bitmap_load(sb, group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 929 | grinfo = ext4_get_group_info(sb, group); |
| 930 | grinfo->bb_fragments = 0; |
| 931 | memset(grinfo->bb_counters, 0, |
Eric Sandeen | 1927805 | 2009-08-25 22:36:25 -0400 | [diff] [blame] | 932 | sizeof(*grinfo->bb_counters) * |
| 933 | (sb->s_blocksize_bits+2)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 934 | /* |
| 935 | * incore got set to the group block bitmap below |
| 936 | */ |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 937 | ext4_lock_group(sb, group); |
Amir Goldstein | 9b8b7d3 | 2011-05-09 21:49:42 -0400 | [diff] [blame] | 938 | /* init the buddy */ |
| 939 | memset(data, 0xff, blocksize); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 940 | ext4_mb_generate_buddy(sb, data, incore, group); |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 941 | ext4_unlock_group(sb, group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 942 | incore = NULL; |
| 943 | } else { |
| 944 | /* this is block of bitmap */ |
| 945 | BUG_ON(incore != NULL); |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 946 | mb_debug(1, "put bitmap for group %u in page %lu/%x\n", |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 947 | group, page->index, i * blocksize); |
Theodore Ts'o | f307333 | 2010-05-17 03:00:00 -0400 | [diff] [blame] | 948 | trace_ext4_mb_bitmap_load(sb, group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 949 | |
| 950 | /* see comments in ext4_mb_put_pa() */ |
| 951 | ext4_lock_group(sb, group); |
| 952 | memcpy(data, bitmap, blocksize); |
| 953 | |
| 954 | /* mark all preallocated blks used in in-core bitmap */ |
| 955 | ext4_mb_generate_from_pa(sb, data, group); |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 956 | ext4_mb_generate_from_freelist(sb, data, group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 957 | ext4_unlock_group(sb, group); |
| 958 | |
| 959 | /* set incore so that the buddy information can be |
| 960 | * generated using this |
| 961 | */ |
| 962 | incore = data; |
| 963 | } |
| 964 | } |
| 965 | SetPageUptodate(page); |
| 966 | |
| 967 | out: |
| 968 | if (bh) { |
Amir Goldstein | 9b8b7d3 | 2011-05-09 21:49:42 -0400 | [diff] [blame] | 969 | for (i = 0; i < groups_per_page; i++) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 970 | brelse(bh[i]); |
| 971 | if (bh != &bhs) |
| 972 | kfree(bh); |
| 973 | } |
| 974 | return err; |
| 975 | } |
| 976 | |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 977 | /* |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 978 | * Lock the buddy and bitmap pages. This make sure other parallel init_group |
| 979 | * on the same buddy page doesn't happen whild holding the buddy page lock. |
| 980 | * Return locked buddy and bitmap pages on e4b struct. If buddy and bitmap |
| 981 | * are on the same page e4b->bd_buddy_page is NULL and return value is 0. |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 982 | */ |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 983 | static int ext4_mb_get_buddy_page_lock(struct super_block *sb, |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 984 | ext4_group_t group, struct ext4_buddy *e4b, gfp_t gfp) |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 985 | { |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 986 | struct inode *inode = EXT4_SB(sb)->s_buddy_cache; |
| 987 | int block, pnum, poff; |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 988 | int blocks_per_page; |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 989 | struct page *page; |
| 990 | |
| 991 | e4b->bd_buddy_page = NULL; |
| 992 | e4b->bd_bitmap_page = NULL; |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 993 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 994 | blocks_per_page = PAGE_SIZE / sb->s_blocksize; |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 995 | /* |
| 996 | * the buddy cache inode stores the block bitmap |
| 997 | * and buddy information in consecutive blocks. |
| 998 | * So for each group we need two blocks. |
| 999 | */ |
| 1000 | block = group * 2; |
| 1001 | pnum = block / blocks_per_page; |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1002 | poff = block % blocks_per_page; |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1003 | page = find_or_create_page(inode->i_mapping, pnum, gfp); |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1004 | if (!page) |
Younger Liu | c57ab39 | 2014-04-10 23:03:43 -0400 | [diff] [blame] | 1005 | return -ENOMEM; |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1006 | BUG_ON(page->mapping != inode->i_mapping); |
| 1007 | e4b->bd_bitmap_page = page; |
| 1008 | e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize); |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 1009 | |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1010 | if (blocks_per_page >= 2) { |
| 1011 | /* buddy and bitmap are on the same page */ |
| 1012 | return 0; |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 1013 | } |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1014 | |
| 1015 | block++; |
| 1016 | pnum = block / blocks_per_page; |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1017 | page = find_or_create_page(inode->i_mapping, pnum, gfp); |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1018 | if (!page) |
Younger Liu | c57ab39 | 2014-04-10 23:03:43 -0400 | [diff] [blame] | 1019 | return -ENOMEM; |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1020 | BUG_ON(page->mapping != inode->i_mapping); |
| 1021 | e4b->bd_buddy_page = page; |
| 1022 | return 0; |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 1023 | } |
| 1024 | |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1025 | static void ext4_mb_put_buddy_page_lock(struct ext4_buddy *e4b) |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 1026 | { |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1027 | if (e4b->bd_bitmap_page) { |
| 1028 | unlock_page(e4b->bd_bitmap_page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1029 | put_page(e4b->bd_bitmap_page); |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 1030 | } |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1031 | if (e4b->bd_buddy_page) { |
| 1032 | unlock_page(e4b->bd_buddy_page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1033 | put_page(e4b->bd_buddy_page); |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1034 | } |
Eric Sandeen | eee4adc | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 1035 | } |
| 1036 | |
| 1037 | /* |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 1038 | * Locking note: This routine calls ext4_mb_init_cache(), which takes the |
| 1039 | * block group lock of all groups for this page; do not hold the BG lock when |
| 1040 | * calling this routine! |
| 1041 | */ |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1042 | static noinline_for_stack |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1043 | int ext4_mb_init_group(struct super_block *sb, ext4_group_t group, gfp_t gfp) |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1044 | { |
| 1045 | |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1046 | struct ext4_group_info *this_grp; |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1047 | struct ext4_buddy e4b; |
| 1048 | struct page *page; |
| 1049 | int ret = 0; |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1050 | |
Theodore Ts'o | b10a44c | 2013-04-03 22:00:52 -0400 | [diff] [blame] | 1051 | might_sleep(); |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1052 | mb_debug(1, "init group %u\n", group); |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1053 | this_grp = ext4_get_group_info(sb, group); |
| 1054 | /* |
Aneesh Kumar K.V | 08c3a81 | 2009-09-09 23:50:17 -0400 | [diff] [blame] | 1055 | * This ensures that we don't reinit the buddy cache |
| 1056 | * page which map to the group from which we are already |
| 1057 | * allocating. If we are looking at the buddy cache we would |
| 1058 | * have taken a reference using ext4_mb_load_buddy and that |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1059 | * would have pinned buddy page to page cache. |
Mel Gorman | 2457aec | 2014-06-04 16:10:31 -0700 | [diff] [blame] | 1060 | * The call to ext4_mb_get_buddy_page_lock will mark the |
| 1061 | * page accessed. |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1062 | */ |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1063 | ret = ext4_mb_get_buddy_page_lock(sb, group, &e4b, gfp); |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1064 | if (ret || !EXT4_MB_GRP_NEED_INIT(this_grp)) { |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1065 | /* |
| 1066 | * somebody initialized the group |
| 1067 | * return without doing anything |
| 1068 | */ |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1069 | goto err; |
| 1070 | } |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1071 | |
| 1072 | page = e4b.bd_bitmap_page; |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1073 | ret = ext4_mb_init_cache(page, NULL, gfp); |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1074 | if (ret) |
| 1075 | goto err; |
| 1076 | if (!PageUptodate(page)) { |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1077 | ret = -EIO; |
| 1078 | goto err; |
| 1079 | } |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1080 | |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1081 | if (e4b.bd_buddy_page == NULL) { |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1082 | /* |
| 1083 | * If both the bitmap and buddy are in |
| 1084 | * the same page we don't need to force |
| 1085 | * init the buddy |
| 1086 | */ |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1087 | ret = 0; |
| 1088 | goto err; |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1089 | } |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1090 | /* init buddy cache */ |
| 1091 | page = e4b.bd_buddy_page; |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1092 | ret = ext4_mb_init_cache(page, e4b.bd_bitmap, gfp); |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1093 | if (ret) |
| 1094 | goto err; |
| 1095 | if (!PageUptodate(page)) { |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1096 | ret = -EIO; |
| 1097 | goto err; |
| 1098 | } |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1099 | err: |
Amir Goldstein | 2de8807 | 2011-05-09 21:48:13 -0400 | [diff] [blame] | 1100 | ext4_mb_put_buddy_page_lock(&e4b); |
Aneesh Kumar K.V | b6a758e | 2009-09-09 23:47:46 -0400 | [diff] [blame] | 1101 | return ret; |
| 1102 | } |
| 1103 | |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 1104 | /* |
| 1105 | * Locking note: This routine calls ext4_mb_init_cache(), which takes the |
| 1106 | * block group lock of all groups for this page; do not hold the BG lock when |
| 1107 | * calling this routine! |
| 1108 | */ |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 1109 | static noinline_for_stack int |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1110 | ext4_mb_load_buddy_gfp(struct super_block *sb, ext4_group_t group, |
| 1111 | struct ext4_buddy *e4b, gfp_t gfp) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1112 | { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1113 | int blocks_per_page; |
| 1114 | int block; |
| 1115 | int pnum; |
| 1116 | int poff; |
| 1117 | struct page *page; |
Shen Feng | fdf6c7a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1118 | int ret; |
Aneesh Kumar K.V | 920313a | 2009-01-05 21:36:19 -0500 | [diff] [blame] | 1119 | struct ext4_group_info *grp; |
| 1120 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 1121 | struct inode *inode = sbi->s_buddy_cache; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1122 | |
Theodore Ts'o | b10a44c | 2013-04-03 22:00:52 -0400 | [diff] [blame] | 1123 | might_sleep(); |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 1124 | mb_debug(1, "load group %u\n", group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1125 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1126 | blocks_per_page = PAGE_SIZE / sb->s_blocksize; |
Aneesh Kumar K.V | 920313a | 2009-01-05 21:36:19 -0500 | [diff] [blame] | 1127 | grp = ext4_get_group_info(sb, group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1128 | |
| 1129 | e4b->bd_blkbits = sb->s_blocksize_bits; |
Tao Ma | 529da70 | 2011-07-23 16:07:26 -0400 | [diff] [blame] | 1130 | e4b->bd_info = grp; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1131 | e4b->bd_sb = sb; |
| 1132 | e4b->bd_group = group; |
| 1133 | e4b->bd_buddy_page = NULL; |
| 1134 | e4b->bd_bitmap_page = NULL; |
| 1135 | |
Aneesh Kumar K.V | f41c075 | 2009-09-09 23:34:50 -0400 | [diff] [blame] | 1136 | if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) { |
Aneesh Kumar K.V | f41c075 | 2009-09-09 23:34:50 -0400 | [diff] [blame] | 1137 | /* |
| 1138 | * we need full data about the group |
| 1139 | * to make a good selection |
| 1140 | */ |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1141 | ret = ext4_mb_init_group(sb, group, gfp); |
Aneesh Kumar K.V | f41c075 | 2009-09-09 23:34:50 -0400 | [diff] [blame] | 1142 | if (ret) |
| 1143 | return ret; |
Aneesh Kumar K.V | f41c075 | 2009-09-09 23:34:50 -0400 | [diff] [blame] | 1144 | } |
| 1145 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1146 | /* |
| 1147 | * the buddy cache inode stores the block bitmap |
| 1148 | * and buddy information in consecutive blocks. |
| 1149 | * So for each group we need two blocks. |
| 1150 | */ |
| 1151 | block = group * 2; |
| 1152 | pnum = block / blocks_per_page; |
| 1153 | poff = block % blocks_per_page; |
| 1154 | |
| 1155 | /* we could use find_or_create_page(), but it locks page |
| 1156 | * what we'd like to avoid in fast path ... */ |
Mel Gorman | 2457aec | 2014-06-04 16:10:31 -0700 | [diff] [blame] | 1157 | page = find_get_page_flags(inode->i_mapping, pnum, FGP_ACCESSED); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1158 | if (page == NULL || !PageUptodate(page)) { |
| 1159 | if (page) |
Aneesh Kumar K.V | 920313a | 2009-01-05 21:36:19 -0500 | [diff] [blame] | 1160 | /* |
| 1161 | * drop the page reference and try |
| 1162 | * to get the page with lock. If we |
| 1163 | * are not uptodate that implies |
| 1164 | * somebody just created the page but |
| 1165 | * is yet to initialize the same. So |
| 1166 | * wait for it to initialize. |
| 1167 | */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1168 | put_page(page); |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1169 | page = find_or_create_page(inode->i_mapping, pnum, gfp); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1170 | if (page) { |
| 1171 | BUG_ON(page->mapping != inode->i_mapping); |
| 1172 | if (!PageUptodate(page)) { |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1173 | ret = ext4_mb_init_cache(page, NULL, gfp); |
Shen Feng | fdf6c7a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1174 | if (ret) { |
| 1175 | unlock_page(page); |
| 1176 | goto err; |
| 1177 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1178 | mb_cmp_bitmaps(e4b, page_address(page) + |
| 1179 | (poff * sb->s_blocksize)); |
| 1180 | } |
| 1181 | unlock_page(page); |
| 1182 | } |
| 1183 | } |
Younger Liu | c57ab39 | 2014-04-10 23:03:43 -0400 | [diff] [blame] | 1184 | if (page == NULL) { |
| 1185 | ret = -ENOMEM; |
| 1186 | goto err; |
| 1187 | } |
| 1188 | if (!PageUptodate(page)) { |
Shen Feng | fdf6c7a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1189 | ret = -EIO; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1190 | goto err; |
Shen Feng | fdf6c7a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1191 | } |
Mel Gorman | 2457aec | 2014-06-04 16:10:31 -0700 | [diff] [blame] | 1192 | |
| 1193 | /* Pages marked accessed already */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1194 | e4b->bd_bitmap_page = page; |
| 1195 | e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1196 | |
| 1197 | block++; |
| 1198 | pnum = block / blocks_per_page; |
| 1199 | poff = block % blocks_per_page; |
| 1200 | |
Mel Gorman | 2457aec | 2014-06-04 16:10:31 -0700 | [diff] [blame] | 1201 | page = find_get_page_flags(inode->i_mapping, pnum, FGP_ACCESSED); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1202 | if (page == NULL || !PageUptodate(page)) { |
| 1203 | if (page) |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1204 | put_page(page); |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1205 | page = find_or_create_page(inode->i_mapping, pnum, gfp); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1206 | if (page) { |
| 1207 | BUG_ON(page->mapping != inode->i_mapping); |
Shen Feng | fdf6c7a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1208 | if (!PageUptodate(page)) { |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1209 | ret = ext4_mb_init_cache(page, e4b->bd_bitmap, |
| 1210 | gfp); |
Shen Feng | fdf6c7a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1211 | if (ret) { |
| 1212 | unlock_page(page); |
| 1213 | goto err; |
| 1214 | } |
| 1215 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1216 | unlock_page(page); |
| 1217 | } |
| 1218 | } |
Younger Liu | c57ab39 | 2014-04-10 23:03:43 -0400 | [diff] [blame] | 1219 | if (page == NULL) { |
| 1220 | ret = -ENOMEM; |
| 1221 | goto err; |
| 1222 | } |
| 1223 | if (!PageUptodate(page)) { |
Shen Feng | fdf6c7a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1224 | ret = -EIO; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1225 | goto err; |
Shen Feng | fdf6c7a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1226 | } |
Mel Gorman | 2457aec | 2014-06-04 16:10:31 -0700 | [diff] [blame] | 1227 | |
| 1228 | /* Pages marked accessed already */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1229 | e4b->bd_buddy_page = page; |
| 1230 | e4b->bd_buddy = page_address(page) + (poff * sb->s_blocksize); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1231 | |
| 1232 | BUG_ON(e4b->bd_bitmap_page == NULL); |
| 1233 | BUG_ON(e4b->bd_buddy_page == NULL); |
| 1234 | |
| 1235 | return 0; |
| 1236 | |
| 1237 | err: |
Yang Ruirui | 26626f11 | 2011-04-16 19:17:48 -0400 | [diff] [blame] | 1238 | if (page) |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1239 | put_page(page); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1240 | if (e4b->bd_bitmap_page) |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1241 | put_page(e4b->bd_bitmap_page); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1242 | if (e4b->bd_buddy_page) |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1243 | put_page(e4b->bd_buddy_page); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1244 | e4b->bd_buddy = NULL; |
| 1245 | e4b->bd_bitmap = NULL; |
Shen Feng | fdf6c7a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1246 | return ret; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1247 | } |
| 1248 | |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 1249 | static int ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group, |
| 1250 | struct ext4_buddy *e4b) |
| 1251 | { |
| 1252 | return ext4_mb_load_buddy_gfp(sb, group, e4b, GFP_NOFS); |
| 1253 | } |
| 1254 | |
Jing Zhang | e39e07f | 2010-05-14 00:00:00 -0400 | [diff] [blame] | 1255 | static void ext4_mb_unload_buddy(struct ext4_buddy *e4b) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1256 | { |
| 1257 | if (e4b->bd_bitmap_page) |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1258 | put_page(e4b->bd_bitmap_page); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1259 | if (e4b->bd_buddy_page) |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1260 | put_page(e4b->bd_buddy_page); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1261 | } |
| 1262 | |
| 1263 | |
| 1264 | static int mb_find_order_for_block(struct ext4_buddy *e4b, int block) |
| 1265 | { |
| 1266 | int order = 1; |
Nicolai Stange | b5cb316 | 2016-05-05 17:38:03 -0400 | [diff] [blame] | 1267 | int bb_incr = 1 << (e4b->bd_blkbits - 1); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1268 | void *bb; |
| 1269 | |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 1270 | BUG_ON(e4b->bd_bitmap == e4b->bd_buddy); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1271 | BUG_ON(block >= (1 << (e4b->bd_blkbits + 3))); |
| 1272 | |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 1273 | bb = e4b->bd_buddy; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1274 | while (order <= e4b->bd_blkbits + 1) { |
| 1275 | block = block >> 1; |
| 1276 | if (!mb_test_bit(block, bb)) { |
| 1277 | /* this block is part of buddy of order 'order' */ |
| 1278 | return order; |
| 1279 | } |
Nicolai Stange | b5cb316 | 2016-05-05 17:38:03 -0400 | [diff] [blame] | 1280 | bb += bb_incr; |
| 1281 | bb_incr >>= 1; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1282 | order++; |
| 1283 | } |
| 1284 | return 0; |
| 1285 | } |
| 1286 | |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 1287 | static void mb_clear_bits(void *bm, int cur, int len) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1288 | { |
| 1289 | __u32 *addr; |
| 1290 | |
| 1291 | len = cur + len; |
| 1292 | while (cur < len) { |
| 1293 | if ((cur & 31) == 0 && (len - cur) >= 32) { |
| 1294 | /* fast path: clear whole word at once */ |
| 1295 | addr = bm + (cur >> 3); |
| 1296 | *addr = 0; |
| 1297 | cur += 32; |
| 1298 | continue; |
| 1299 | } |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 1300 | mb_clear_bit(cur, bm); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1301 | cur++; |
| 1302 | } |
| 1303 | } |
| 1304 | |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1305 | /* clear bits in given range |
| 1306 | * will return first found zero bit if any, -1 otherwise |
| 1307 | */ |
| 1308 | static int mb_test_and_clear_bits(void *bm, int cur, int len) |
| 1309 | { |
| 1310 | __u32 *addr; |
| 1311 | int zero_bit = -1; |
| 1312 | |
| 1313 | len = cur + len; |
| 1314 | while (cur < len) { |
| 1315 | if ((cur & 31) == 0 && (len - cur) >= 32) { |
| 1316 | /* fast path: clear whole word at once */ |
| 1317 | addr = bm + (cur >> 3); |
| 1318 | if (*addr != (__u32)(-1) && zero_bit == -1) |
| 1319 | zero_bit = cur + mb_find_next_zero_bit(addr, 32, 0); |
| 1320 | *addr = 0; |
| 1321 | cur += 32; |
| 1322 | continue; |
| 1323 | } |
| 1324 | if (!mb_test_and_clear_bit(cur, bm) && zero_bit == -1) |
| 1325 | zero_bit = cur; |
| 1326 | cur++; |
| 1327 | } |
| 1328 | |
| 1329 | return zero_bit; |
| 1330 | } |
| 1331 | |
Yongqiang Yang | c3e94d1 | 2011-07-26 22:05:53 -0400 | [diff] [blame] | 1332 | void ext4_set_bits(void *bm, int cur, int len) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1333 | { |
| 1334 | __u32 *addr; |
| 1335 | |
| 1336 | len = cur + len; |
| 1337 | while (cur < len) { |
| 1338 | if ((cur & 31) == 0 && (len - cur) >= 32) { |
| 1339 | /* fast path: set whole word at once */ |
| 1340 | addr = bm + (cur >> 3); |
| 1341 | *addr = 0xffffffff; |
| 1342 | cur += 32; |
| 1343 | continue; |
| 1344 | } |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 1345 | mb_set_bit(cur, bm); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1346 | cur++; |
| 1347 | } |
| 1348 | } |
| 1349 | |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1350 | /* |
| 1351 | * _________________________________________________________________ */ |
| 1352 | |
| 1353 | static inline int mb_buddy_adjust_border(int* bit, void* bitmap, int side) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1354 | { |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1355 | if (mb_test_bit(*bit + side, bitmap)) { |
| 1356 | mb_clear_bit(*bit, bitmap); |
| 1357 | (*bit) -= side; |
| 1358 | return 1; |
| 1359 | } |
| 1360 | else { |
| 1361 | (*bit) += side; |
| 1362 | mb_set_bit(*bit, bitmap); |
| 1363 | return -1; |
| 1364 | } |
| 1365 | } |
| 1366 | |
| 1367 | static void mb_buddy_mark_free(struct ext4_buddy *e4b, int first, int last) |
| 1368 | { |
| 1369 | int max; |
| 1370 | int order = 1; |
| 1371 | void *buddy = mb_find_buddy(e4b, order, &max); |
| 1372 | |
| 1373 | while (buddy) { |
| 1374 | void *buddy2; |
| 1375 | |
| 1376 | /* Bits in range [first; last] are known to be set since |
| 1377 | * corresponding blocks were allocated. Bits in range |
| 1378 | * (first; last) will stay set because they form buddies on |
| 1379 | * upper layer. We just deal with borders if they don't |
| 1380 | * align with upper layer and then go up. |
| 1381 | * Releasing entire group is all about clearing |
| 1382 | * single bit of highest order buddy. |
| 1383 | */ |
| 1384 | |
| 1385 | /* Example: |
| 1386 | * --------------------------------- |
| 1387 | * | 1 | 1 | 1 | 1 | |
| 1388 | * --------------------------------- |
| 1389 | * | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| 1390 | * --------------------------------- |
| 1391 | * 0 1 2 3 4 5 6 7 |
| 1392 | * \_____________________/ |
| 1393 | * |
| 1394 | * Neither [1] nor [6] is aligned to above layer. |
| 1395 | * Left neighbour [0] is free, so mark it busy, |
| 1396 | * decrease bb_counters and extend range to |
| 1397 | * [0; 6] |
| 1398 | * Right neighbour [7] is busy. It can't be coaleasced with [6], so |
| 1399 | * mark [6] free, increase bb_counters and shrink range to |
| 1400 | * [0; 5]. |
| 1401 | * Then shift range to [0; 2], go up and do the same. |
| 1402 | */ |
| 1403 | |
| 1404 | |
| 1405 | if (first & 1) |
| 1406 | e4b->bd_info->bb_counters[order] += mb_buddy_adjust_border(&first, buddy, -1); |
| 1407 | if (!(last & 1)) |
| 1408 | e4b->bd_info->bb_counters[order] += mb_buddy_adjust_border(&last, buddy, 1); |
| 1409 | if (first > last) |
| 1410 | break; |
| 1411 | order++; |
| 1412 | |
| 1413 | if (first == last || !(buddy2 = mb_find_buddy(e4b, order, &max))) { |
| 1414 | mb_clear_bits(buddy, first, last - first + 1); |
| 1415 | e4b->bd_info->bb_counters[order - 1] += last - first + 1; |
| 1416 | break; |
| 1417 | } |
| 1418 | first >>= 1; |
| 1419 | last >>= 1; |
| 1420 | buddy = buddy2; |
| 1421 | } |
| 1422 | } |
| 1423 | |
| 1424 | static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b, |
| 1425 | int first, int count) |
| 1426 | { |
| 1427 | int left_is_free = 0; |
| 1428 | int right_is_free = 0; |
| 1429 | int block; |
| 1430 | int last = first + count - 1; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1431 | struct super_block *sb = e4b->bd_sb; |
| 1432 | |
Theodore Ts'o | c99d1e6 | 2014-08-23 17:47:28 -0400 | [diff] [blame] | 1433 | if (WARN_ON(count == 0)) |
| 1434 | return; |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1435 | BUG_ON(last >= (sb->s_blocksize << 3)); |
Vincent Minet | bc8e674 | 2009-05-15 08:33:18 -0400 | [diff] [blame] | 1436 | assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group)); |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 1437 | /* Don't bother if the block group is corrupt. */ |
| 1438 | if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) |
| 1439 | return; |
| 1440 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1441 | mb_check_buddy(e4b); |
| 1442 | mb_free_blocks_double(inode, e4b, first, count); |
| 1443 | |
| 1444 | e4b->bd_info->bb_free += count; |
| 1445 | if (first < e4b->bd_info->bb_first_free) |
| 1446 | e4b->bd_info->bb_first_free = first; |
| 1447 | |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1448 | /* access memory sequentially: check left neighbour, |
| 1449 | * clear range and then check right neighbour |
| 1450 | */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1451 | if (first != 0) |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1452 | left_is_free = !mb_test_bit(first - 1, e4b->bd_bitmap); |
| 1453 | block = mb_test_and_clear_bits(e4b->bd_bitmap, first, count); |
| 1454 | if (last + 1 < EXT4_SB(sb)->s_mb_maxs[0]) |
| 1455 | right_is_free = !mb_test_bit(last + 1, e4b->bd_bitmap); |
| 1456 | |
| 1457 | if (unlikely(block != -1)) { |
Namjae Jeon | e43bb4e | 2014-06-26 10:11:53 -0400 | [diff] [blame] | 1458 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1459 | ext4_fsblk_t blocknr; |
| 1460 | |
| 1461 | blocknr = ext4_group_first_block_no(sb, e4b->bd_group); |
| 1462 | blocknr += EXT4_C2B(EXT4_SB(sb), block); |
| 1463 | ext4_grp_locked_error(sb, e4b->bd_group, |
| 1464 | inode ? inode->i_ino : 0, |
| 1465 | blocknr, |
| 1466 | "freeing already freed block " |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 1467 | "(bit %u); block bitmap corrupt.", |
| 1468 | block); |
Namjae Jeon | e43bb4e | 2014-06-26 10:11:53 -0400 | [diff] [blame] | 1469 | if (!EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)) |
| 1470 | percpu_counter_sub(&sbi->s_freeclusters_counter, |
| 1471 | e4b->bd_info->bb_free); |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 1472 | /* Mark the block group as corrupt. */ |
| 1473 | set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, |
| 1474 | &e4b->bd_info->bb_state); |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1475 | mb_regenerate_buddy(e4b); |
| 1476 | goto done; |
| 1477 | } |
| 1478 | |
| 1479 | /* let's maintain fragments counter */ |
| 1480 | if (left_is_free && right_is_free) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1481 | e4b->bd_info->bb_fragments--; |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1482 | else if (!left_is_free && !right_is_free) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1483 | e4b->bd_info->bb_fragments++; |
| 1484 | |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1485 | /* buddy[0] == bd_bitmap is a special case, so handle |
| 1486 | * it right away and let mb_buddy_mark_free stay free of |
| 1487 | * zero order checks. |
| 1488 | * Check if neighbours are to be coaleasced, |
| 1489 | * adjust bitmap bb_counters and borders appropriately. |
| 1490 | */ |
| 1491 | if (first & 1) { |
| 1492 | first += !left_is_free; |
| 1493 | e4b->bd_info->bb_counters[0] += left_is_free ? -1 : 1; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1494 | } |
Andrey Sidorov | eabe044 | 2013-04-09 12:22:29 -0400 | [diff] [blame] | 1495 | if (!(last & 1)) { |
| 1496 | last -= !right_is_free; |
| 1497 | e4b->bd_info->bb_counters[0] += right_is_free ? -1 : 1; |
| 1498 | } |
| 1499 | |
| 1500 | if (first <= last) |
| 1501 | mb_buddy_mark_free(e4b, first >> 1, last >> 1); |
| 1502 | |
| 1503 | done: |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 1504 | mb_set_largest_free_order(sb, e4b->bd_info); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1505 | mb_check_buddy(e4b); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1506 | } |
| 1507 | |
Robin Dong | 15c006a | 2012-08-17 10:02:17 -0400 | [diff] [blame] | 1508 | static int mb_find_extent(struct ext4_buddy *e4b, int block, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1509 | int needed, struct ext4_free_extent *ex) |
| 1510 | { |
| 1511 | int next = block; |
Robin Dong | 15c006a | 2012-08-17 10:02:17 -0400 | [diff] [blame] | 1512 | int max, order; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1513 | void *buddy; |
| 1514 | |
Vincent Minet | bc8e674 | 2009-05-15 08:33:18 -0400 | [diff] [blame] | 1515 | assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1516 | BUG_ON(ex == NULL); |
| 1517 | |
Robin Dong | 15c006a | 2012-08-17 10:02:17 -0400 | [diff] [blame] | 1518 | buddy = mb_find_buddy(e4b, 0, &max); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1519 | BUG_ON(buddy == NULL); |
| 1520 | BUG_ON(block >= max); |
| 1521 | if (mb_test_bit(block, buddy)) { |
| 1522 | ex->fe_len = 0; |
| 1523 | ex->fe_start = 0; |
| 1524 | ex->fe_group = 0; |
| 1525 | return 0; |
| 1526 | } |
| 1527 | |
Robin Dong | 15c006a | 2012-08-17 10:02:17 -0400 | [diff] [blame] | 1528 | /* find actual order */ |
| 1529 | order = mb_find_order_for_block(e4b, block); |
| 1530 | block = block >> order; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1531 | |
| 1532 | ex->fe_len = 1 << order; |
| 1533 | ex->fe_start = block << order; |
| 1534 | ex->fe_group = e4b->bd_group; |
| 1535 | |
| 1536 | /* calc difference from given start */ |
| 1537 | next = next - ex->fe_start; |
| 1538 | ex->fe_len -= next; |
| 1539 | ex->fe_start += next; |
| 1540 | |
| 1541 | while (needed > ex->fe_len && |
Alan Cox | d8ec0c3 | 2012-11-08 12:19:58 -0500 | [diff] [blame] | 1542 | mb_find_buddy(e4b, order, &max)) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1543 | |
| 1544 | if (block + 1 >= max) |
| 1545 | break; |
| 1546 | |
| 1547 | next = (block + 1) * (1 << order); |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 1548 | if (mb_test_bit(next, e4b->bd_bitmap)) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1549 | break; |
| 1550 | |
Robin Dong | b051d8d | 2011-10-26 05:30:30 -0400 | [diff] [blame] | 1551 | order = mb_find_order_for_block(e4b, next); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1552 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1553 | block = next >> order; |
| 1554 | ex->fe_len += 1 << order; |
| 1555 | } |
| 1556 | |
Theodore Ts'o | 43c7322 | 2017-01-22 19:35:52 -0500 | [diff] [blame] | 1557 | if (ex->fe_start + ex->fe_len > (1 << (e4b->bd_blkbits + 3))) { |
| 1558 | /* Should never happen! (but apparently sometimes does?!?) */ |
| 1559 | WARN_ON(1); |
| 1560 | ext4_error(e4b->bd_sb, "corruption or bug in mb_find_extent " |
| 1561 | "block=%d, order=%d needed=%d ex=%u/%d/%d@%u", |
| 1562 | block, order, needed, ex->fe_group, ex->fe_start, |
| 1563 | ex->fe_len, ex->fe_logical); |
| 1564 | ex->fe_len = 0; |
| 1565 | ex->fe_start = 0; |
| 1566 | ex->fe_group = 0; |
| 1567 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1568 | return ex->fe_len; |
| 1569 | } |
| 1570 | |
| 1571 | static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex) |
| 1572 | { |
| 1573 | int ord; |
| 1574 | int mlen = 0; |
| 1575 | int max = 0; |
| 1576 | int cur; |
| 1577 | int start = ex->fe_start; |
| 1578 | int len = ex->fe_len; |
| 1579 | unsigned ret = 0; |
| 1580 | int len0 = len; |
| 1581 | void *buddy; |
| 1582 | |
| 1583 | BUG_ON(start + len > (e4b->bd_sb->s_blocksize << 3)); |
| 1584 | BUG_ON(e4b->bd_group != ex->fe_group); |
Vincent Minet | bc8e674 | 2009-05-15 08:33:18 -0400 | [diff] [blame] | 1585 | assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1586 | mb_check_buddy(e4b); |
| 1587 | mb_mark_used_double(e4b, start, len); |
| 1588 | |
| 1589 | e4b->bd_info->bb_free -= len; |
| 1590 | if (e4b->bd_info->bb_first_free == start) |
| 1591 | e4b->bd_info->bb_first_free += len; |
| 1592 | |
| 1593 | /* let's maintain fragments counter */ |
| 1594 | if (start != 0) |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 1595 | mlen = !mb_test_bit(start - 1, e4b->bd_bitmap); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1596 | if (start + len < EXT4_SB(e4b->bd_sb)->s_mb_maxs[0]) |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 1597 | max = !mb_test_bit(start + len, e4b->bd_bitmap); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1598 | if (mlen && max) |
| 1599 | e4b->bd_info->bb_fragments++; |
| 1600 | else if (!mlen && !max) |
| 1601 | e4b->bd_info->bb_fragments--; |
| 1602 | |
| 1603 | /* let's maintain buddy itself */ |
| 1604 | while (len) { |
| 1605 | ord = mb_find_order_for_block(e4b, start); |
| 1606 | |
| 1607 | if (((start >> ord) << ord) == start && len >= (1 << ord)) { |
| 1608 | /* the whole chunk may be allocated at once! */ |
| 1609 | mlen = 1 << ord; |
| 1610 | buddy = mb_find_buddy(e4b, ord, &max); |
| 1611 | BUG_ON((start >> ord) >= max); |
| 1612 | mb_set_bit(start >> ord, buddy); |
| 1613 | e4b->bd_info->bb_counters[ord]--; |
| 1614 | start += mlen; |
| 1615 | len -= mlen; |
| 1616 | BUG_ON(len < 0); |
| 1617 | continue; |
| 1618 | } |
| 1619 | |
| 1620 | /* store for history */ |
| 1621 | if (ret == 0) |
| 1622 | ret = len | (ord << 16); |
| 1623 | |
| 1624 | /* we have to split large buddy */ |
| 1625 | BUG_ON(ord <= 0); |
| 1626 | buddy = mb_find_buddy(e4b, ord, &max); |
| 1627 | mb_set_bit(start >> ord, buddy); |
| 1628 | e4b->bd_info->bb_counters[ord]--; |
| 1629 | |
| 1630 | ord--; |
| 1631 | cur = (start >> ord) & ~1U; |
| 1632 | buddy = mb_find_buddy(e4b, ord, &max); |
| 1633 | mb_clear_bit(cur, buddy); |
| 1634 | mb_clear_bit(cur + 1, buddy); |
| 1635 | e4b->bd_info->bb_counters[ord]++; |
| 1636 | e4b->bd_info->bb_counters[ord]++; |
| 1637 | } |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 1638 | mb_set_largest_free_order(e4b->bd_sb, e4b->bd_info); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1639 | |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 1640 | ext4_set_bits(e4b->bd_bitmap, ex->fe_start, len0); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1641 | mb_check_buddy(e4b); |
| 1642 | |
| 1643 | return ret; |
| 1644 | } |
| 1645 | |
| 1646 | /* |
| 1647 | * Must be called under group lock! |
| 1648 | */ |
| 1649 | static void ext4_mb_use_best_found(struct ext4_allocation_context *ac, |
| 1650 | struct ext4_buddy *e4b) |
| 1651 | { |
| 1652 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
| 1653 | int ret; |
| 1654 | |
| 1655 | BUG_ON(ac->ac_b_ex.fe_group != e4b->bd_group); |
| 1656 | BUG_ON(ac->ac_status == AC_STATUS_FOUND); |
| 1657 | |
| 1658 | ac->ac_b_ex.fe_len = min(ac->ac_b_ex.fe_len, ac->ac_g_ex.fe_len); |
| 1659 | ac->ac_b_ex.fe_logical = ac->ac_g_ex.fe_logical; |
| 1660 | ret = mb_mark_used(e4b, &ac->ac_b_ex); |
| 1661 | |
| 1662 | /* preallocation can change ac_b_ex, thus we store actually |
| 1663 | * allocated blocks for history */ |
| 1664 | ac->ac_f_ex = ac->ac_b_ex; |
| 1665 | |
| 1666 | ac->ac_status = AC_STATUS_FOUND; |
| 1667 | ac->ac_tail = ret & 0xffff; |
| 1668 | ac->ac_buddy = ret >> 16; |
| 1669 | |
Aneesh Kumar K.V | c3a326a | 2008-11-25 15:11:52 -0500 | [diff] [blame] | 1670 | /* |
| 1671 | * take the page reference. We want the page to be pinned |
| 1672 | * so that we don't get a ext4_mb_init_cache_call for this |
| 1673 | * group until we update the bitmap. That would mean we |
| 1674 | * double allocate blocks. The reference is dropped |
| 1675 | * in ext4_mb_release_context |
| 1676 | */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1677 | ac->ac_bitmap_page = e4b->bd_bitmap_page; |
| 1678 | get_page(ac->ac_bitmap_page); |
| 1679 | ac->ac_buddy_page = e4b->bd_buddy_page; |
| 1680 | get_page(ac->ac_buddy_page); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1681 | /* store last allocated for subsequent stream allocation */ |
Theodore Ts'o | 4ba74d0 | 2009-08-09 22:01:13 -0400 | [diff] [blame] | 1682 | if (ac->ac_flags & EXT4_MB_STREAM_ALLOC) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1683 | spin_lock(&sbi->s_md_lock); |
| 1684 | sbi->s_mb_last_group = ac->ac_f_ex.fe_group; |
| 1685 | sbi->s_mb_last_start = ac->ac_f_ex.fe_start; |
| 1686 | spin_unlock(&sbi->s_md_lock); |
| 1687 | } |
| 1688 | } |
| 1689 | |
| 1690 | /* |
| 1691 | * regular allocator, for general purposes allocation |
| 1692 | */ |
| 1693 | |
| 1694 | static void ext4_mb_check_limits(struct ext4_allocation_context *ac, |
| 1695 | struct ext4_buddy *e4b, |
| 1696 | int finish_group) |
| 1697 | { |
| 1698 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
| 1699 | struct ext4_free_extent *bex = &ac->ac_b_ex; |
| 1700 | struct ext4_free_extent *gex = &ac->ac_g_ex; |
| 1701 | struct ext4_free_extent ex; |
| 1702 | int max; |
| 1703 | |
Aneesh Kumar K.V | 032115f | 2009-01-05 21:34:30 -0500 | [diff] [blame] | 1704 | if (ac->ac_status == AC_STATUS_FOUND) |
| 1705 | return; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1706 | /* |
| 1707 | * We don't want to scan for a whole year |
| 1708 | */ |
| 1709 | if (ac->ac_found > sbi->s_mb_max_to_scan && |
| 1710 | !(ac->ac_flags & EXT4_MB_HINT_FIRST)) { |
| 1711 | ac->ac_status = AC_STATUS_BREAK; |
| 1712 | return; |
| 1713 | } |
| 1714 | |
| 1715 | /* |
| 1716 | * Haven't found good chunk so far, let's continue |
| 1717 | */ |
| 1718 | if (bex->fe_len < gex->fe_len) |
| 1719 | return; |
| 1720 | |
| 1721 | if ((finish_group || ac->ac_found > sbi->s_mb_min_to_scan) |
| 1722 | && bex->fe_group == e4b->bd_group) { |
| 1723 | /* recheck chunk's availability - we don't know |
| 1724 | * when it was found (within this lock-unlock |
| 1725 | * period or not) */ |
Robin Dong | 15c006a | 2012-08-17 10:02:17 -0400 | [diff] [blame] | 1726 | max = mb_find_extent(e4b, bex->fe_start, gex->fe_len, &ex); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1727 | if (max >= gex->fe_len) { |
| 1728 | ext4_mb_use_best_found(ac, e4b); |
| 1729 | return; |
| 1730 | } |
| 1731 | } |
| 1732 | } |
| 1733 | |
| 1734 | /* |
| 1735 | * The routine checks whether found extent is good enough. If it is, |
| 1736 | * then the extent gets marked used and flag is set to the context |
| 1737 | * to stop scanning. Otherwise, the extent is compared with the |
| 1738 | * previous found extent and if new one is better, then it's stored |
| 1739 | * in the context. Later, the best found extent will be used, if |
| 1740 | * mballoc can't find good enough extent. |
| 1741 | * |
| 1742 | * FIXME: real allocation policy is to be designed yet! |
| 1743 | */ |
| 1744 | static void ext4_mb_measure_extent(struct ext4_allocation_context *ac, |
| 1745 | struct ext4_free_extent *ex, |
| 1746 | struct ext4_buddy *e4b) |
| 1747 | { |
| 1748 | struct ext4_free_extent *bex = &ac->ac_b_ex; |
| 1749 | struct ext4_free_extent *gex = &ac->ac_g_ex; |
| 1750 | |
| 1751 | BUG_ON(ex->fe_len <= 0); |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 1752 | BUG_ON(ex->fe_len > EXT4_CLUSTERS_PER_GROUP(ac->ac_sb)); |
| 1753 | BUG_ON(ex->fe_start >= EXT4_CLUSTERS_PER_GROUP(ac->ac_sb)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1754 | BUG_ON(ac->ac_status != AC_STATUS_CONTINUE); |
| 1755 | |
| 1756 | ac->ac_found++; |
| 1757 | |
| 1758 | /* |
| 1759 | * The special case - take what you catch first |
| 1760 | */ |
| 1761 | if (unlikely(ac->ac_flags & EXT4_MB_HINT_FIRST)) { |
| 1762 | *bex = *ex; |
| 1763 | ext4_mb_use_best_found(ac, e4b); |
| 1764 | return; |
| 1765 | } |
| 1766 | |
| 1767 | /* |
| 1768 | * Let's check whether the chuck is good enough |
| 1769 | */ |
| 1770 | if (ex->fe_len == gex->fe_len) { |
| 1771 | *bex = *ex; |
| 1772 | ext4_mb_use_best_found(ac, e4b); |
| 1773 | return; |
| 1774 | } |
| 1775 | |
| 1776 | /* |
| 1777 | * If this is first found extent, just store it in the context |
| 1778 | */ |
| 1779 | if (bex->fe_len == 0) { |
| 1780 | *bex = *ex; |
| 1781 | return; |
| 1782 | } |
| 1783 | |
| 1784 | /* |
| 1785 | * If new found extent is better, store it in the context |
| 1786 | */ |
| 1787 | if (bex->fe_len < gex->fe_len) { |
| 1788 | /* if the request isn't satisfied, any found extent |
| 1789 | * larger than previous best one is better */ |
| 1790 | if (ex->fe_len > bex->fe_len) |
| 1791 | *bex = *ex; |
| 1792 | } else if (ex->fe_len > gex->fe_len) { |
| 1793 | /* if the request is satisfied, then we try to find |
| 1794 | * an extent that still satisfy the request, but is |
| 1795 | * smaller than previous one */ |
| 1796 | if (ex->fe_len < bex->fe_len) |
| 1797 | *bex = *ex; |
| 1798 | } |
| 1799 | |
| 1800 | ext4_mb_check_limits(ac, e4b, 0); |
| 1801 | } |
| 1802 | |
Eric Sandeen | 089ceec | 2009-07-05 22:17:31 -0400 | [diff] [blame] | 1803 | static noinline_for_stack |
| 1804 | int ext4_mb_try_best_found(struct ext4_allocation_context *ac, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1805 | struct ext4_buddy *e4b) |
| 1806 | { |
| 1807 | struct ext4_free_extent ex = ac->ac_b_ex; |
| 1808 | ext4_group_t group = ex.fe_group; |
| 1809 | int max; |
| 1810 | int err; |
| 1811 | |
| 1812 | BUG_ON(ex.fe_len <= 0); |
| 1813 | err = ext4_mb_load_buddy(ac->ac_sb, group, e4b); |
| 1814 | if (err) |
| 1815 | return err; |
| 1816 | |
| 1817 | ext4_lock_group(ac->ac_sb, group); |
Robin Dong | 15c006a | 2012-08-17 10:02:17 -0400 | [diff] [blame] | 1818 | max = mb_find_extent(e4b, ex.fe_start, ex.fe_len, &ex); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1819 | |
| 1820 | if (max > 0) { |
| 1821 | ac->ac_b_ex = ex; |
| 1822 | ext4_mb_use_best_found(ac, e4b); |
| 1823 | } |
| 1824 | |
| 1825 | ext4_unlock_group(ac->ac_sb, group); |
Jing Zhang | e39e07f | 2010-05-14 00:00:00 -0400 | [diff] [blame] | 1826 | ext4_mb_unload_buddy(e4b); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1827 | |
| 1828 | return 0; |
| 1829 | } |
| 1830 | |
Eric Sandeen | 089ceec | 2009-07-05 22:17:31 -0400 | [diff] [blame] | 1831 | static noinline_for_stack |
| 1832 | int ext4_mb_find_by_goal(struct ext4_allocation_context *ac, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1833 | struct ext4_buddy *e4b) |
| 1834 | { |
| 1835 | ext4_group_t group = ac->ac_g_ex.fe_group; |
| 1836 | int max; |
| 1837 | int err; |
| 1838 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
Yongqiang Yang | 838cd0c | 2012-09-23 23:10:51 -0400 | [diff] [blame] | 1839 | struct ext4_group_info *grp = ext4_get_group_info(ac->ac_sb, group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1840 | struct ext4_free_extent ex; |
| 1841 | |
| 1842 | if (!(ac->ac_flags & EXT4_MB_HINT_TRY_GOAL)) |
| 1843 | return 0; |
Yongqiang Yang | 838cd0c | 2012-09-23 23:10:51 -0400 | [diff] [blame] | 1844 | if (grp->bb_free == 0) |
| 1845 | return 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1846 | |
| 1847 | err = ext4_mb_load_buddy(ac->ac_sb, group, e4b); |
| 1848 | if (err) |
| 1849 | return err; |
| 1850 | |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 1851 | if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) { |
| 1852 | ext4_mb_unload_buddy(e4b); |
| 1853 | return 0; |
| 1854 | } |
| 1855 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1856 | ext4_lock_group(ac->ac_sb, group); |
Robin Dong | 15c006a | 2012-08-17 10:02:17 -0400 | [diff] [blame] | 1857 | max = mb_find_extent(e4b, ac->ac_g_ex.fe_start, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1858 | ac->ac_g_ex.fe_len, &ex); |
Theodore Ts'o | ab0c00f | 2014-02-20 00:36:41 -0500 | [diff] [blame] | 1859 | ex.fe_logical = 0xDEADFA11; /* debug value */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1860 | |
| 1861 | if (max >= ac->ac_g_ex.fe_len && ac->ac_g_ex.fe_len == sbi->s_stripe) { |
| 1862 | ext4_fsblk_t start; |
| 1863 | |
Akinobu Mita | 5661bd6 | 2010-03-03 23:53:39 -0500 | [diff] [blame] | 1864 | start = ext4_group_first_block_no(ac->ac_sb, e4b->bd_group) + |
| 1865 | ex.fe_start; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1866 | /* use do_div to get remainder (would be 64-bit modulo) */ |
| 1867 | if (do_div(start, sbi->s_stripe) == 0) { |
| 1868 | ac->ac_found++; |
| 1869 | ac->ac_b_ex = ex; |
| 1870 | ext4_mb_use_best_found(ac, e4b); |
| 1871 | } |
| 1872 | } else if (max >= ac->ac_g_ex.fe_len) { |
| 1873 | BUG_ON(ex.fe_len <= 0); |
| 1874 | BUG_ON(ex.fe_group != ac->ac_g_ex.fe_group); |
| 1875 | BUG_ON(ex.fe_start != ac->ac_g_ex.fe_start); |
| 1876 | ac->ac_found++; |
| 1877 | ac->ac_b_ex = ex; |
| 1878 | ext4_mb_use_best_found(ac, e4b); |
| 1879 | } else if (max > 0 && (ac->ac_flags & EXT4_MB_HINT_MERGE)) { |
| 1880 | /* Sometimes, caller may want to merge even small |
| 1881 | * number of blocks to an existing extent */ |
| 1882 | BUG_ON(ex.fe_len <= 0); |
| 1883 | BUG_ON(ex.fe_group != ac->ac_g_ex.fe_group); |
| 1884 | BUG_ON(ex.fe_start != ac->ac_g_ex.fe_start); |
| 1885 | ac->ac_found++; |
| 1886 | ac->ac_b_ex = ex; |
| 1887 | ext4_mb_use_best_found(ac, e4b); |
| 1888 | } |
| 1889 | ext4_unlock_group(ac->ac_sb, group); |
Jing Zhang | e39e07f | 2010-05-14 00:00:00 -0400 | [diff] [blame] | 1890 | ext4_mb_unload_buddy(e4b); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1891 | |
| 1892 | return 0; |
| 1893 | } |
| 1894 | |
| 1895 | /* |
| 1896 | * The routine scans buddy structures (not bitmap!) from given order |
| 1897 | * to max order and tries to find big enough chunk to satisfy the req |
| 1898 | */ |
Eric Sandeen | 089ceec | 2009-07-05 22:17:31 -0400 | [diff] [blame] | 1899 | static noinline_for_stack |
| 1900 | void ext4_mb_simple_scan_group(struct ext4_allocation_context *ac, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1901 | struct ext4_buddy *e4b) |
| 1902 | { |
| 1903 | struct super_block *sb = ac->ac_sb; |
| 1904 | struct ext4_group_info *grp = e4b->bd_info; |
| 1905 | void *buddy; |
| 1906 | int i; |
| 1907 | int k; |
| 1908 | int max; |
| 1909 | |
| 1910 | BUG_ON(ac->ac_2order <= 0); |
| 1911 | for (i = ac->ac_2order; i <= sb->s_blocksize_bits + 1; i++) { |
| 1912 | if (grp->bb_counters[i] == 0) |
| 1913 | continue; |
| 1914 | |
| 1915 | buddy = mb_find_buddy(e4b, i, &max); |
| 1916 | BUG_ON(buddy == NULL); |
| 1917 | |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 1918 | k = mb_find_next_zero_bit(buddy, max, 0); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1919 | BUG_ON(k >= max); |
| 1920 | |
| 1921 | ac->ac_found++; |
| 1922 | |
| 1923 | ac->ac_b_ex.fe_len = 1 << i; |
| 1924 | ac->ac_b_ex.fe_start = k << i; |
| 1925 | ac->ac_b_ex.fe_group = e4b->bd_group; |
| 1926 | |
| 1927 | ext4_mb_use_best_found(ac, e4b); |
| 1928 | |
| 1929 | BUG_ON(ac->ac_b_ex.fe_len != ac->ac_g_ex.fe_len); |
| 1930 | |
| 1931 | if (EXT4_SB(sb)->s_mb_stats) |
| 1932 | atomic_inc(&EXT4_SB(sb)->s_bal_2orders); |
| 1933 | |
| 1934 | break; |
| 1935 | } |
| 1936 | } |
| 1937 | |
| 1938 | /* |
| 1939 | * The routine scans the group and measures all found extents. |
| 1940 | * In order to optimize scanning, caller must pass number of |
| 1941 | * free blocks in the group, so the routine can know upper limit. |
| 1942 | */ |
Eric Sandeen | 089ceec | 2009-07-05 22:17:31 -0400 | [diff] [blame] | 1943 | static noinline_for_stack |
| 1944 | void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1945 | struct ext4_buddy *e4b) |
| 1946 | { |
| 1947 | struct super_block *sb = ac->ac_sb; |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 1948 | void *bitmap = e4b->bd_bitmap; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1949 | struct ext4_free_extent ex; |
| 1950 | int i; |
| 1951 | int free; |
| 1952 | |
| 1953 | free = e4b->bd_info->bb_free; |
| 1954 | BUG_ON(free <= 0); |
| 1955 | |
| 1956 | i = e4b->bd_info->bb_first_free; |
| 1957 | |
| 1958 | while (free && ac->ac_status == AC_STATUS_CONTINUE) { |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 1959 | i = mb_find_next_zero_bit(bitmap, |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 1960 | EXT4_CLUSTERS_PER_GROUP(sb), i); |
| 1961 | if (i >= EXT4_CLUSTERS_PER_GROUP(sb)) { |
Aneesh Kumar K.V | 26346ff | 2008-02-10 01:10:04 -0500 | [diff] [blame] | 1962 | /* |
Aneesh Kumar K.V | e56eb65 | 2008-02-15 13:48:21 -0500 | [diff] [blame] | 1963 | * IF we have corrupt bitmap, we won't find any |
Aneesh Kumar K.V | 26346ff | 2008-02-10 01:10:04 -0500 | [diff] [blame] | 1964 | * free blocks even though group info says we |
| 1965 | * we have free blocks |
| 1966 | */ |
Theodore Ts'o | e29136f | 2010-06-29 12:54:28 -0400 | [diff] [blame] | 1967 | ext4_grp_locked_error(sb, e4b->bd_group, 0, 0, |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 1968 | "%d free clusters as per " |
Theodore Ts'o | fde4d95 | 2009-01-05 22:17:35 -0500 | [diff] [blame] | 1969 | "group info. But bitmap says 0", |
Aneesh Kumar K.V | 26346ff | 2008-02-10 01:10:04 -0500 | [diff] [blame] | 1970 | free); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1971 | break; |
| 1972 | } |
| 1973 | |
Robin Dong | 15c006a | 2012-08-17 10:02:17 -0400 | [diff] [blame] | 1974 | mb_find_extent(e4b, i, ac->ac_g_ex.fe_len, &ex); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1975 | BUG_ON(ex.fe_len <= 0); |
Aneesh Kumar K.V | 26346ff | 2008-02-10 01:10:04 -0500 | [diff] [blame] | 1976 | if (free < ex.fe_len) { |
Theodore Ts'o | e29136f | 2010-06-29 12:54:28 -0400 | [diff] [blame] | 1977 | ext4_grp_locked_error(sb, e4b->bd_group, 0, 0, |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 1978 | "%d free clusters as per " |
Theodore Ts'o | fde4d95 | 2009-01-05 22:17:35 -0500 | [diff] [blame] | 1979 | "group info. But got %d blocks", |
Aneesh Kumar K.V | 26346ff | 2008-02-10 01:10:04 -0500 | [diff] [blame] | 1980 | free, ex.fe_len); |
Aneesh Kumar K.V | e56eb65 | 2008-02-15 13:48:21 -0500 | [diff] [blame] | 1981 | /* |
| 1982 | * The number of free blocks differs. This mostly |
| 1983 | * indicate that the bitmap is corrupt. So exit |
| 1984 | * without claiming the space. |
| 1985 | */ |
| 1986 | break; |
Aneesh Kumar K.V | 26346ff | 2008-02-10 01:10:04 -0500 | [diff] [blame] | 1987 | } |
Theodore Ts'o | ab0c00f | 2014-02-20 00:36:41 -0500 | [diff] [blame] | 1988 | ex.fe_logical = 0xDEADC0DE; /* debug value */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 1989 | ext4_mb_measure_extent(ac, &ex, e4b); |
| 1990 | |
| 1991 | i += ex.fe_len; |
| 1992 | free -= ex.fe_len; |
| 1993 | } |
| 1994 | |
| 1995 | ext4_mb_check_limits(ac, e4b, 1); |
| 1996 | } |
| 1997 | |
| 1998 | /* |
| 1999 | * This is a special case for storages like raid5 |
Eric Sandeen | 506bf2d | 2010-07-27 11:56:06 -0400 | [diff] [blame] | 2000 | * we try to find stripe-aligned chunks for stripe-size-multiple requests |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2001 | */ |
Eric Sandeen | 089ceec | 2009-07-05 22:17:31 -0400 | [diff] [blame] | 2002 | static noinline_for_stack |
| 2003 | void ext4_mb_scan_aligned(struct ext4_allocation_context *ac, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2004 | struct ext4_buddy *e4b) |
| 2005 | { |
| 2006 | struct super_block *sb = ac->ac_sb; |
| 2007 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | c5e8f3f | 2012-02-20 17:54:06 -0500 | [diff] [blame] | 2008 | void *bitmap = e4b->bd_bitmap; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2009 | struct ext4_free_extent ex; |
| 2010 | ext4_fsblk_t first_group_block; |
| 2011 | ext4_fsblk_t a; |
| 2012 | ext4_grpblk_t i; |
| 2013 | int max; |
| 2014 | |
| 2015 | BUG_ON(sbi->s_stripe == 0); |
| 2016 | |
| 2017 | /* find first stripe-aligned block in group */ |
Akinobu Mita | 5661bd6 | 2010-03-03 23:53:39 -0500 | [diff] [blame] | 2018 | first_group_block = ext4_group_first_block_no(sb, e4b->bd_group); |
| 2019 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2020 | a = first_group_block + sbi->s_stripe - 1; |
| 2021 | do_div(a, sbi->s_stripe); |
| 2022 | i = (a * sbi->s_stripe) - first_group_block; |
| 2023 | |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 2024 | while (i < EXT4_CLUSTERS_PER_GROUP(sb)) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2025 | if (!mb_test_bit(i, bitmap)) { |
Robin Dong | 15c006a | 2012-08-17 10:02:17 -0400 | [diff] [blame] | 2026 | max = mb_find_extent(e4b, i, sbi->s_stripe, &ex); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2027 | if (max >= sbi->s_stripe) { |
| 2028 | ac->ac_found++; |
Theodore Ts'o | ab0c00f | 2014-02-20 00:36:41 -0500 | [diff] [blame] | 2029 | ex.fe_logical = 0xDEADF00D; /* debug value */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2030 | ac->ac_b_ex = ex; |
| 2031 | ext4_mb_use_best_found(ac, e4b); |
| 2032 | break; |
| 2033 | } |
| 2034 | } |
| 2035 | i += sbi->s_stripe; |
| 2036 | } |
| 2037 | } |
| 2038 | |
Lukas Czerner | 42ac184 | 2015-06-08 11:40:40 -0400 | [diff] [blame] | 2039 | /* |
| 2040 | * This is now called BEFORE we load the buddy bitmap. |
| 2041 | * Returns either 1 or 0 indicating that the group is either suitable |
| 2042 | * for the allocation or not. In addition it can also return negative |
| 2043 | * error code when something goes wrong. |
| 2044 | */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2045 | static int ext4_mb_good_group(struct ext4_allocation_context *ac, |
| 2046 | ext4_group_t group, int cr) |
| 2047 | { |
| 2048 | unsigned free, fragments; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 2049 | int flex_size = ext4_flex_bg_size(EXT4_SB(ac->ac_sb)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2050 | struct ext4_group_info *grp = ext4_get_group_info(ac->ac_sb, group); |
| 2051 | |
| 2052 | BUG_ON(cr < 0 || cr >= 4); |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 2053 | |
Theodore Ts'o | 01fc48e | 2012-08-17 09:46:17 -0400 | [diff] [blame] | 2054 | free = grp->bb_free; |
| 2055 | if (free == 0) |
| 2056 | return 0; |
| 2057 | if (cr <= 2 && free < ac->ac_g_ex.fe_len) |
| 2058 | return 0; |
| 2059 | |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 2060 | if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(grp))) |
| 2061 | return 0; |
| 2062 | |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 2063 | /* We only do this if the grp has never been initialized */ |
| 2064 | if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) { |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 2065 | int ret = ext4_mb_init_group(ac->ac_sb, group, GFP_NOFS); |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 2066 | if (ret) |
Lukas Czerner | 42ac184 | 2015-06-08 11:40:40 -0400 | [diff] [blame] | 2067 | return ret; |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 2068 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2069 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2070 | fragments = grp->bb_fragments; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2071 | if (fragments == 0) |
| 2072 | return 0; |
| 2073 | |
| 2074 | switch (cr) { |
| 2075 | case 0: |
| 2076 | BUG_ON(ac->ac_2order == 0); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2077 | |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 2078 | /* Avoid using the first bg of a flexgroup for data files */ |
| 2079 | if ((ac->ac_flags & EXT4_MB_HINT_DATA) && |
| 2080 | (flex_size >= EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME) && |
| 2081 | ((group % flex_size) == 0)) |
| 2082 | return 0; |
| 2083 | |
Theodore Ts'o | 40ae348 | 2013-02-04 15:08:40 -0500 | [diff] [blame] | 2084 | if ((ac->ac_2order > ac->ac_sb->s_blocksize_bits+1) || |
| 2085 | (free / fragments) >= ac->ac_g_ex.fe_len) |
| 2086 | return 1; |
| 2087 | |
| 2088 | if (grp->bb_largest_free_order < ac->ac_2order) |
| 2089 | return 0; |
| 2090 | |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 2091 | return 1; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2092 | case 1: |
| 2093 | if ((free / fragments) >= ac->ac_g_ex.fe_len) |
| 2094 | return 1; |
| 2095 | break; |
| 2096 | case 2: |
| 2097 | if (free >= ac->ac_g_ex.fe_len) |
| 2098 | return 1; |
| 2099 | break; |
| 2100 | case 3: |
| 2101 | return 1; |
| 2102 | default: |
| 2103 | BUG(); |
| 2104 | } |
| 2105 | |
| 2106 | return 0; |
| 2107 | } |
| 2108 | |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 2109 | static noinline_for_stack int |
| 2110 | ext4_mb_regular_allocator(struct ext4_allocation_context *ac) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2111 | { |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2112 | ext4_group_t ngroups, group, i; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2113 | int cr; |
Lukas Czerner | 42ac184 | 2015-06-08 11:40:40 -0400 | [diff] [blame] | 2114 | int err = 0, first_err = 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2115 | struct ext4_sb_info *sbi; |
| 2116 | struct super_block *sb; |
| 2117 | struct ext4_buddy e4b; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2118 | |
| 2119 | sb = ac->ac_sb; |
| 2120 | sbi = EXT4_SB(sb); |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2121 | ngroups = ext4_get_groups_count(sb); |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 2122 | /* non-extent files are limited to low blocks/groups */ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 2123 | if (!(ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS))) |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 2124 | ngroups = sbi->s_blockfile_groups; |
| 2125 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2126 | BUG_ON(ac->ac_status == AC_STATUS_FOUND); |
| 2127 | |
| 2128 | /* first, try the goal */ |
| 2129 | err = ext4_mb_find_by_goal(ac, &e4b); |
| 2130 | if (err || ac->ac_status == AC_STATUS_FOUND) |
| 2131 | goto out; |
| 2132 | |
| 2133 | if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY)) |
| 2134 | goto out; |
| 2135 | |
| 2136 | /* |
| 2137 | * ac->ac2_order is set only if the fe_len is a power of 2 |
| 2138 | * if ac2_order is set we also set criteria to 0 so that we |
| 2139 | * try exact allocation using buddy. |
| 2140 | */ |
| 2141 | i = fls(ac->ac_g_ex.fe_len); |
| 2142 | ac->ac_2order = 0; |
| 2143 | /* |
| 2144 | * We search using buddy data only if the order of the request |
| 2145 | * is greater than equal to the sbi_s_mb_order2_reqs |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 2146 | * You can tune it via /sys/fs/ext4/<partition>/mb_order2_req |
Jan Kara | d9b22cf | 2017-02-10 00:50:56 -0500 | [diff] [blame] | 2147 | * We also support searching for power-of-two requests only for |
| 2148 | * requests upto maximum buddy size we have constructed. |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2149 | */ |
Jan Kara | d9b22cf | 2017-02-10 00:50:56 -0500 | [diff] [blame] | 2150 | if (i >= sbi->s_mb_order2_reqs && i <= sb->s_blocksize_bits + 2) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2151 | /* |
| 2152 | * This should tell if fe_len is exactly power of 2 |
| 2153 | */ |
| 2154 | if ((ac->ac_g_ex.fe_len & (~(1 << (i - 1)))) == 0) |
| 2155 | ac->ac_2order = i - 1; |
| 2156 | } |
| 2157 | |
Theodore Ts'o | 4ba74d0 | 2009-08-09 22:01:13 -0400 | [diff] [blame] | 2158 | /* if stream allocation is enabled, use global goal */ |
| 2159 | if (ac->ac_flags & EXT4_MB_STREAM_ALLOC) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2160 | /* TBD: may be hot point */ |
| 2161 | spin_lock(&sbi->s_md_lock); |
| 2162 | ac->ac_g_ex.fe_group = sbi->s_mb_last_group; |
| 2163 | ac->ac_g_ex.fe_start = sbi->s_mb_last_start; |
| 2164 | spin_unlock(&sbi->s_md_lock); |
| 2165 | } |
Theodore Ts'o | 4ba74d0 | 2009-08-09 22:01:13 -0400 | [diff] [blame] | 2166 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2167 | /* Let's just scan groups to find more-less suitable blocks */ |
| 2168 | cr = ac->ac_2order ? 0 : 1; |
| 2169 | /* |
| 2170 | * cr == 0 try to get exact allocation, |
| 2171 | * cr == 3 try to get anything |
| 2172 | */ |
| 2173 | repeat: |
| 2174 | for (; cr < 4 && ac->ac_status == AC_STATUS_CONTINUE; cr++) { |
| 2175 | ac->ac_criteria = cr; |
Aneesh Kumar K.V | ed8f9c7 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2176 | /* |
| 2177 | * searching for the right group start |
| 2178 | * from the goal value specified |
| 2179 | */ |
| 2180 | group = ac->ac_g_ex.fe_group; |
| 2181 | |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2182 | for (i = 0; i < ngroups; group++, i++) { |
Lukas Czerner | 42ac184 | 2015-06-08 11:40:40 -0400 | [diff] [blame] | 2183 | int ret = 0; |
Theodore Ts'o | 2ed5724 | 2013-06-12 11:43:02 -0400 | [diff] [blame] | 2184 | cond_resched(); |
Lachlan McIlroy | e615573 | 2013-05-05 23:10:00 -0400 | [diff] [blame] | 2185 | /* |
| 2186 | * Artificially restricted ngroups for non-extent |
| 2187 | * files makes group > ngroups possible on first loop. |
| 2188 | */ |
| 2189 | if (group >= ngroups) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2190 | group = 0; |
| 2191 | |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 2192 | /* This now checks without needing the buddy page */ |
Lukas Czerner | 42ac184 | 2015-06-08 11:40:40 -0400 | [diff] [blame] | 2193 | ret = ext4_mb_good_group(ac, group, cr); |
| 2194 | if (ret <= 0) { |
| 2195 | if (!first_err) |
| 2196 | first_err = ret; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2197 | continue; |
Lukas Czerner | 42ac184 | 2015-06-08 11:40:40 -0400 | [diff] [blame] | 2198 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2199 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2200 | err = ext4_mb_load_buddy(sb, group, &e4b); |
| 2201 | if (err) |
| 2202 | goto out; |
| 2203 | |
| 2204 | ext4_lock_group(sb, group); |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 2205 | |
| 2206 | /* |
| 2207 | * We need to check again after locking the |
| 2208 | * block group |
| 2209 | */ |
Lukas Czerner | 42ac184 | 2015-06-08 11:40:40 -0400 | [diff] [blame] | 2210 | ret = ext4_mb_good_group(ac, group, cr); |
| 2211 | if (ret <= 0) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2212 | ext4_unlock_group(sb, group); |
Jing Zhang | e39e07f | 2010-05-14 00:00:00 -0400 | [diff] [blame] | 2213 | ext4_mb_unload_buddy(&e4b); |
Lukas Czerner | 42ac184 | 2015-06-08 11:40:40 -0400 | [diff] [blame] | 2214 | if (!first_err) |
| 2215 | first_err = ret; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2216 | continue; |
| 2217 | } |
| 2218 | |
| 2219 | ac->ac_groups_scanned++; |
Jan Kara | d9b22cf | 2017-02-10 00:50:56 -0500 | [diff] [blame] | 2220 | if (cr == 0) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2221 | ext4_mb_simple_scan_group(ac, &e4b); |
Eric Sandeen | 506bf2d | 2010-07-27 11:56:06 -0400 | [diff] [blame] | 2222 | else if (cr == 1 && sbi->s_stripe && |
| 2223 | !(ac->ac_g_ex.fe_len % sbi->s_stripe)) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2224 | ext4_mb_scan_aligned(ac, &e4b); |
| 2225 | else |
| 2226 | ext4_mb_complex_scan_group(ac, &e4b); |
| 2227 | |
| 2228 | ext4_unlock_group(sb, group); |
Jing Zhang | e39e07f | 2010-05-14 00:00:00 -0400 | [diff] [blame] | 2229 | ext4_mb_unload_buddy(&e4b); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2230 | |
| 2231 | if (ac->ac_status != AC_STATUS_CONTINUE) |
| 2232 | break; |
| 2233 | } |
| 2234 | } |
| 2235 | |
| 2236 | if (ac->ac_b_ex.fe_len > 0 && ac->ac_status != AC_STATUS_FOUND && |
| 2237 | !(ac->ac_flags & EXT4_MB_HINT_FIRST)) { |
| 2238 | /* |
| 2239 | * We've been searching too long. Let's try to allocate |
| 2240 | * the best chunk we've found so far |
| 2241 | */ |
| 2242 | |
| 2243 | ext4_mb_try_best_found(ac, &e4b); |
| 2244 | if (ac->ac_status != AC_STATUS_FOUND) { |
| 2245 | /* |
| 2246 | * Someone more lucky has already allocated it. |
| 2247 | * The only thing we can do is just take first |
| 2248 | * found block(s) |
| 2249 | printk(KERN_DEBUG "EXT4-fs: someone won our chunk\n"); |
| 2250 | */ |
| 2251 | ac->ac_b_ex.fe_group = 0; |
| 2252 | ac->ac_b_ex.fe_start = 0; |
| 2253 | ac->ac_b_ex.fe_len = 0; |
| 2254 | ac->ac_status = AC_STATUS_CONTINUE; |
| 2255 | ac->ac_flags |= EXT4_MB_HINT_FIRST; |
| 2256 | cr = 3; |
| 2257 | atomic_inc(&sbi->s_mb_lost_chunks); |
| 2258 | goto repeat; |
| 2259 | } |
| 2260 | } |
| 2261 | out: |
Lukas Czerner | 42ac184 | 2015-06-08 11:40:40 -0400 | [diff] [blame] | 2262 | if (!err && ac->ac_status != AC_STATUS_FOUND && first_err) |
| 2263 | err = first_err; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2264 | return err; |
| 2265 | } |
| 2266 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2267 | static void *ext4_mb_seq_groups_start(struct seq_file *seq, loff_t *pos) |
| 2268 | { |
| 2269 | struct super_block *sb = seq->private; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2270 | ext4_group_t group; |
| 2271 | |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2272 | if (*pos < 0 || *pos >= ext4_get_groups_count(sb)) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2273 | return NULL; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2274 | group = *pos + 1; |
Theodore Ts'o | a9df9a4 | 2009-01-05 22:18:16 -0500 | [diff] [blame] | 2275 | return (void *) ((unsigned long) group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2276 | } |
| 2277 | |
| 2278 | static void *ext4_mb_seq_groups_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2279 | { |
| 2280 | struct super_block *sb = seq->private; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2281 | ext4_group_t group; |
| 2282 | |
| 2283 | ++*pos; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2284 | if (*pos < 0 || *pos >= ext4_get_groups_count(sb)) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2285 | return NULL; |
| 2286 | group = *pos + 1; |
Theodore Ts'o | a9df9a4 | 2009-01-05 22:18:16 -0500 | [diff] [blame] | 2287 | return (void *) ((unsigned long) group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2288 | } |
| 2289 | |
| 2290 | static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v) |
| 2291 | { |
| 2292 | struct super_block *sb = seq->private; |
Theodore Ts'o | a9df9a4 | 2009-01-05 22:18:16 -0500 | [diff] [blame] | 2293 | ext4_group_t group = (ext4_group_t) ((unsigned long) v); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2294 | int i; |
Aditya Kali | 1c8457c | 2012-06-30 19:10:57 -0400 | [diff] [blame] | 2295 | int err, buddy_loaded = 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2296 | struct ext4_buddy e4b; |
Aditya Kali | 1c8457c | 2012-06-30 19:10:57 -0400 | [diff] [blame] | 2297 | struct ext4_group_info *grinfo; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2298 | struct sg { |
| 2299 | struct ext4_group_info info; |
Chandan Rajendra | 30a9d7a | 2016-11-14 21:26:26 -0500 | [diff] [blame] | 2300 | ext4_grpblk_t counters[EXT4_MAX_BLOCK_LOG_SIZE + 2]; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2301 | } sg; |
| 2302 | |
| 2303 | group--; |
| 2304 | if (group == 0) |
Rasmus Villemoes | 97b4af2 | 2015-06-15 00:32:58 -0400 | [diff] [blame] | 2305 | seq_puts(seq, "#group: free frags first [" |
| 2306 | " 2^0 2^1 2^2 2^3 2^4 2^5 2^6 " |
Huaitong Han | 802cf1f | 2016-02-12 00:17:16 -0500 | [diff] [blame] | 2307 | " 2^7 2^8 2^9 2^10 2^11 2^12 2^13 ]\n"); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2308 | |
| 2309 | i = (sb->s_blocksize_bits + 2) * sizeof(sg.info.bb_counters[0]) + |
| 2310 | sizeof(struct ext4_group_info); |
Aditya Kali | 1c8457c | 2012-06-30 19:10:57 -0400 | [diff] [blame] | 2311 | grinfo = ext4_get_group_info(sb, group); |
| 2312 | /* Load the group info in memory only if not already loaded. */ |
| 2313 | if (unlikely(EXT4_MB_GRP_NEED_INIT(grinfo))) { |
| 2314 | err = ext4_mb_load_buddy(sb, group, &e4b); |
| 2315 | if (err) { |
| 2316 | seq_printf(seq, "#%-5u: I/O error\n", group); |
| 2317 | return 0; |
| 2318 | } |
| 2319 | buddy_loaded = 1; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2320 | } |
Aditya Kali | 1c8457c | 2012-06-30 19:10:57 -0400 | [diff] [blame] | 2321 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2322 | memcpy(&sg, ext4_get_group_info(sb, group), i); |
Aditya Kali | 1c8457c | 2012-06-30 19:10:57 -0400 | [diff] [blame] | 2323 | |
| 2324 | if (buddy_loaded) |
| 2325 | ext4_mb_unload_buddy(&e4b); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2326 | |
Theodore Ts'o | a9df9a4 | 2009-01-05 22:18:16 -0500 | [diff] [blame] | 2327 | seq_printf(seq, "#%-5u: %-5u %-5u %-5u [", group, sg.info.bb_free, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2328 | sg.info.bb_fragments, sg.info.bb_first_free); |
| 2329 | for (i = 0; i <= 13; i++) |
| 2330 | seq_printf(seq, " %-5u", i <= sb->s_blocksize_bits + 1 ? |
| 2331 | sg.info.bb_counters[i] : 0); |
| 2332 | seq_printf(seq, " ]\n"); |
| 2333 | |
| 2334 | return 0; |
| 2335 | } |
| 2336 | |
| 2337 | static void ext4_mb_seq_groups_stop(struct seq_file *seq, void *v) |
| 2338 | { |
| 2339 | } |
| 2340 | |
Tobias Klauser | 7f1346a | 2009-09-05 09:28:54 -0400 | [diff] [blame] | 2341 | static const struct seq_operations ext4_mb_seq_groups_ops = { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2342 | .start = ext4_mb_seq_groups_start, |
| 2343 | .next = ext4_mb_seq_groups_next, |
| 2344 | .stop = ext4_mb_seq_groups_stop, |
| 2345 | .show = ext4_mb_seq_groups_show, |
| 2346 | }; |
| 2347 | |
| 2348 | static int ext4_mb_seq_groups_open(struct inode *inode, struct file *file) |
| 2349 | { |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 2350 | struct super_block *sb = PDE_DATA(inode); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2351 | int rc; |
| 2352 | |
| 2353 | rc = seq_open(file, &ext4_mb_seq_groups_ops); |
| 2354 | if (rc == 0) { |
Joe Perches | a271fe8 | 2010-07-27 11:56:04 -0400 | [diff] [blame] | 2355 | struct seq_file *m = file->private_data; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2356 | m->private = sb; |
| 2357 | } |
| 2358 | return rc; |
| 2359 | |
| 2360 | } |
| 2361 | |
Theodore Ts'o | ebd173b | 2015-09-23 12:46:17 -0400 | [diff] [blame] | 2362 | const struct file_operations ext4_seq_mb_groups_fops = { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2363 | .open = ext4_mb_seq_groups_open, |
| 2364 | .read = seq_read, |
| 2365 | .llseek = seq_lseek, |
| 2366 | .release = seq_release, |
| 2367 | }; |
| 2368 | |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2369 | static struct kmem_cache *get_groupinfo_cache(int blocksize_bits) |
| 2370 | { |
| 2371 | int cache_index = blocksize_bits - EXT4_MIN_BLOCK_LOG_SIZE; |
| 2372 | struct kmem_cache *cachep = ext4_groupinfo_caches[cache_index]; |
| 2373 | |
| 2374 | BUG_ON(!cachep); |
| 2375 | return cachep; |
| 2376 | } |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2377 | |
Theodore Ts'o | 28623c2 | 2012-09-05 01:31:50 -0400 | [diff] [blame] | 2378 | /* |
| 2379 | * Allocate the top-level s_group_info array for the specified number |
| 2380 | * of groups |
| 2381 | */ |
| 2382 | int ext4_mb_alloc_groupinfo(struct super_block *sb, ext4_group_t ngroups) |
| 2383 | { |
| 2384 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 2385 | unsigned size; |
| 2386 | struct ext4_group_info ***new_groupinfo; |
| 2387 | |
| 2388 | size = (ngroups + EXT4_DESC_PER_BLOCK(sb) - 1) >> |
| 2389 | EXT4_DESC_PER_BLOCK_BITS(sb); |
| 2390 | if (size <= sbi->s_group_info_size) |
| 2391 | return 0; |
| 2392 | |
| 2393 | size = roundup_pow_of_two(sizeof(*sbi->s_group_info) * size); |
Michal Hocko | a7c3e90 | 2017-05-08 15:57:09 -0700 | [diff] [blame] | 2394 | new_groupinfo = kvzalloc(size, GFP_KERNEL); |
Theodore Ts'o | 28623c2 | 2012-09-05 01:31:50 -0400 | [diff] [blame] | 2395 | if (!new_groupinfo) { |
| 2396 | ext4_msg(sb, KERN_ERR, "can't allocate buddy meta group"); |
| 2397 | return -ENOMEM; |
| 2398 | } |
| 2399 | if (sbi->s_group_info) { |
| 2400 | memcpy(new_groupinfo, sbi->s_group_info, |
| 2401 | sbi->s_group_info_size * sizeof(*sbi->s_group_info)); |
Al Viro | b93b41d | 2014-11-20 12:19:11 -0500 | [diff] [blame] | 2402 | kvfree(sbi->s_group_info); |
Theodore Ts'o | 28623c2 | 2012-09-05 01:31:50 -0400 | [diff] [blame] | 2403 | } |
| 2404 | sbi->s_group_info = new_groupinfo; |
| 2405 | sbi->s_group_info_size = size / sizeof(*sbi->s_group_info); |
| 2406 | ext4_debug("allocated s_groupinfo array for %d meta_bg's\n", |
| 2407 | sbi->s_group_info_size); |
| 2408 | return 0; |
| 2409 | } |
| 2410 | |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2411 | /* Create and initialize ext4_group_info data for the given group. */ |
Aneesh Kumar K.V | 920313a | 2009-01-05 21:36:19 -0500 | [diff] [blame] | 2412 | int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group, |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2413 | struct ext4_group_desc *desc) |
| 2414 | { |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2415 | int i; |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2416 | int metalen = 0; |
| 2417 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 2418 | struct ext4_group_info **meta_group_info; |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2419 | struct kmem_cache *cachep = get_groupinfo_cache(sb->s_blocksize_bits); |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2420 | |
| 2421 | /* |
| 2422 | * First check if this group is the first of a reserved block. |
| 2423 | * If it's true, we have to allocate a new table of pointers |
| 2424 | * to ext4_group_info structures |
| 2425 | */ |
| 2426 | if (group % EXT4_DESC_PER_BLOCK(sb) == 0) { |
| 2427 | metalen = sizeof(*meta_group_info) << |
| 2428 | EXT4_DESC_PER_BLOCK_BITS(sb); |
Dmitry Monakhov | 4fdb554 | 2014-11-25 13:08:04 -0500 | [diff] [blame] | 2429 | meta_group_info = kmalloc(metalen, GFP_NOFS); |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2430 | if (meta_group_info == NULL) { |
Joe Perches | 7f6a11e | 2012-03-19 23:09:43 -0400 | [diff] [blame] | 2431 | ext4_msg(sb, KERN_ERR, "can't allocate mem " |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 2432 | "for a buddy group"); |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2433 | goto exit_meta_group_info; |
| 2434 | } |
| 2435 | sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)] = |
| 2436 | meta_group_info; |
| 2437 | } |
| 2438 | |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2439 | meta_group_info = |
| 2440 | sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)]; |
| 2441 | i = group & (EXT4_DESC_PER_BLOCK(sb) - 1); |
| 2442 | |
Dmitry Monakhov | 4fdb554 | 2014-11-25 13:08:04 -0500 | [diff] [blame] | 2443 | meta_group_info[i] = kmem_cache_zalloc(cachep, GFP_NOFS); |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2444 | if (meta_group_info[i] == NULL) { |
Joe Perches | 7f6a11e | 2012-03-19 23:09:43 -0400 | [diff] [blame] | 2445 | ext4_msg(sb, KERN_ERR, "can't allocate buddy mem"); |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2446 | goto exit_group_info; |
| 2447 | } |
| 2448 | set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, |
| 2449 | &(meta_group_info[i]->bb_state)); |
| 2450 | |
| 2451 | /* |
| 2452 | * initialize bb_free to be able to skip |
| 2453 | * empty groups without initialization |
| 2454 | */ |
| 2455 | if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
| 2456 | meta_group_info[i]->bb_free = |
Theodore Ts'o | cff1dfd7 | 2011-09-09 19:12:51 -0400 | [diff] [blame] | 2457 | ext4_free_clusters_after_init(sb, group, desc); |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2458 | } else { |
| 2459 | meta_group_info[i]->bb_free = |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 2460 | ext4_free_group_clusters(sb, desc); |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2461 | } |
| 2462 | |
| 2463 | INIT_LIST_HEAD(&meta_group_info[i]->bb_prealloc_list); |
Aneesh Kumar K.V | 920313a | 2009-01-05 21:36:19 -0500 | [diff] [blame] | 2464 | init_rwsem(&meta_group_info[i]->alloc_sem); |
Venkatesh Pallipadi | 64e290e | 2010-03-04 22:25:21 -0500 | [diff] [blame] | 2465 | meta_group_info[i]->bb_free_root = RB_ROOT; |
Curt Wohlgemuth | 8a57d9d | 2010-05-16 15:00:00 -0400 | [diff] [blame] | 2466 | meta_group_info[i]->bb_largest_free_order = -1; /* uninit */ |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2467 | |
| 2468 | #ifdef DOUBLE_CHECK |
| 2469 | { |
| 2470 | struct buffer_head *bh; |
| 2471 | meta_group_info[i]->bb_bitmap = |
Dmitry Monakhov | 4fdb554 | 2014-11-25 13:08:04 -0500 | [diff] [blame] | 2472 | kmalloc(sb->s_blocksize, GFP_NOFS); |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2473 | BUG_ON(meta_group_info[i]->bb_bitmap == NULL); |
| 2474 | bh = ext4_read_block_bitmap(sb, group); |
Darrick J. Wong | 9008a58 | 2015-10-17 21:33:24 -0400 | [diff] [blame] | 2475 | BUG_ON(IS_ERR_OR_NULL(bh)); |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2476 | memcpy(meta_group_info[i]->bb_bitmap, bh->b_data, |
| 2477 | sb->s_blocksize); |
| 2478 | put_bh(bh); |
| 2479 | } |
| 2480 | #endif |
| 2481 | |
| 2482 | return 0; |
| 2483 | |
| 2484 | exit_group_info: |
| 2485 | /* If a meta_group_info table has been allocated, release it now */ |
Tao Ma | caaf7a2 | 2011-07-11 18:42:42 -0400 | [diff] [blame] | 2486 | if (group % EXT4_DESC_PER_BLOCK(sb) == 0) { |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2487 | kfree(sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)]); |
Tao Ma | caaf7a2 | 2011-07-11 18:42:42 -0400 | [diff] [blame] | 2488 | sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)] = NULL; |
| 2489 | } |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2490 | exit_meta_group_info: |
| 2491 | return -ENOMEM; |
| 2492 | } /* ext4_mb_add_groupinfo */ |
| 2493 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2494 | static int ext4_mb_init_backend(struct super_block *sb) |
| 2495 | { |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2496 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2497 | ext4_group_t i; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2498 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | 28623c2 | 2012-09-05 01:31:50 -0400 | [diff] [blame] | 2499 | int err; |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2500 | struct ext4_group_desc *desc; |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2501 | struct kmem_cache *cachep; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2502 | |
Theodore Ts'o | 28623c2 | 2012-09-05 01:31:50 -0400 | [diff] [blame] | 2503 | err = ext4_mb_alloc_groupinfo(sb, ngroups); |
| 2504 | if (err) |
| 2505 | return err; |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2506 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2507 | sbi->s_buddy_cache = new_inode(sb); |
| 2508 | if (sbi->s_buddy_cache == NULL) { |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 2509 | ext4_msg(sb, KERN_ERR, "can't get new inode"); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2510 | goto err_freesgi; |
| 2511 | } |
Yu Jian | 48e6061 | 2011-08-01 17:41:39 -0400 | [diff] [blame] | 2512 | /* To avoid potentially colliding with an valid on-disk inode number, |
| 2513 | * use EXT4_BAD_INO for the buddy cache inode number. This inode is |
| 2514 | * not in the inode hash, so it should never be found by iget(), but |
| 2515 | * this will avoid confusion if it ever shows up during debugging. */ |
| 2516 | sbi->s_buddy_cache->i_ino = EXT4_BAD_INO; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2517 | EXT4_I(sbi->s_buddy_cache)->i_disksize = 0; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2518 | for (i = 0; i < ngroups; i++) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2519 | desc = ext4_get_group_desc(sb, i, NULL); |
| 2520 | if (desc == NULL) { |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 2521 | ext4_msg(sb, KERN_ERR, "can't read descriptor %u", i); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2522 | goto err_freebuddy; |
| 2523 | } |
Frederic Bohe | 5f21b0e | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2524 | if (ext4_mb_add_groupinfo(sb, i, desc) != 0) |
| 2525 | goto err_freebuddy; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2526 | } |
| 2527 | |
| 2528 | return 0; |
| 2529 | |
| 2530 | err_freebuddy: |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2531 | cachep = get_groupinfo_cache(sb->s_blocksize_bits); |
Roel Kluin | f1fa334 | 2008-04-29 22:01:15 -0400 | [diff] [blame] | 2532 | while (i-- > 0) |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2533 | kmem_cache_free(cachep, ext4_get_group_info(sb, i)); |
Theodore Ts'o | 28623c2 | 2012-09-05 01:31:50 -0400 | [diff] [blame] | 2534 | i = sbi->s_group_info_size; |
Roel Kluin | f1fa334 | 2008-04-29 22:01:15 -0400 | [diff] [blame] | 2535 | while (i-- > 0) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2536 | kfree(sbi->s_group_info[i]); |
| 2537 | iput(sbi->s_buddy_cache); |
| 2538 | err_freesgi: |
Al Viro | b93b41d | 2014-11-20 12:19:11 -0500 | [diff] [blame] | 2539 | kvfree(sbi->s_group_info); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2540 | return -ENOMEM; |
| 2541 | } |
| 2542 | |
Eric Sandeen | 2892c15 | 2011-02-12 08:12:18 -0500 | [diff] [blame] | 2543 | static void ext4_groupinfo_destroy_slabs(void) |
| 2544 | { |
| 2545 | int i; |
| 2546 | |
| 2547 | for (i = 0; i < NR_GRPINFO_CACHES; i++) { |
| 2548 | if (ext4_groupinfo_caches[i]) |
| 2549 | kmem_cache_destroy(ext4_groupinfo_caches[i]); |
| 2550 | ext4_groupinfo_caches[i] = NULL; |
| 2551 | } |
| 2552 | } |
| 2553 | |
| 2554 | static int ext4_groupinfo_create_slab(size_t size) |
| 2555 | { |
| 2556 | static DEFINE_MUTEX(ext4_grpinfo_slab_create_mutex); |
| 2557 | int slab_size; |
| 2558 | int blocksize_bits = order_base_2(size); |
| 2559 | int cache_index = blocksize_bits - EXT4_MIN_BLOCK_LOG_SIZE; |
| 2560 | struct kmem_cache *cachep; |
| 2561 | |
| 2562 | if (cache_index >= NR_GRPINFO_CACHES) |
| 2563 | return -EINVAL; |
| 2564 | |
| 2565 | if (unlikely(cache_index < 0)) |
| 2566 | cache_index = 0; |
| 2567 | |
| 2568 | mutex_lock(&ext4_grpinfo_slab_create_mutex); |
| 2569 | if (ext4_groupinfo_caches[cache_index]) { |
| 2570 | mutex_unlock(&ext4_grpinfo_slab_create_mutex); |
| 2571 | return 0; /* Already created */ |
| 2572 | } |
| 2573 | |
| 2574 | slab_size = offsetof(struct ext4_group_info, |
| 2575 | bb_counters[blocksize_bits + 2]); |
| 2576 | |
| 2577 | cachep = kmem_cache_create(ext4_groupinfo_slab_names[cache_index], |
| 2578 | slab_size, 0, SLAB_RECLAIM_ACCOUNT, |
| 2579 | NULL); |
| 2580 | |
Tao Ma | 823ba01 | 2011-07-11 18:26:01 -0400 | [diff] [blame] | 2581 | ext4_groupinfo_caches[cache_index] = cachep; |
| 2582 | |
Eric Sandeen | 2892c15 | 2011-02-12 08:12:18 -0500 | [diff] [blame] | 2583 | mutex_unlock(&ext4_grpinfo_slab_create_mutex); |
| 2584 | if (!cachep) { |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 2585 | printk(KERN_EMERG |
| 2586 | "EXT4-fs: no memory for groupinfo slab cache\n"); |
Eric Sandeen | 2892c15 | 2011-02-12 08:12:18 -0500 | [diff] [blame] | 2587 | return -ENOMEM; |
| 2588 | } |
| 2589 | |
Eric Sandeen | 2892c15 | 2011-02-12 08:12:18 -0500 | [diff] [blame] | 2590 | return 0; |
| 2591 | } |
| 2592 | |
Akira Fujita | 9d99012 | 2012-05-28 14:19:25 -0400 | [diff] [blame] | 2593 | int ext4_mb_init(struct super_block *sb) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2594 | { |
| 2595 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 2596 | unsigned i, j; |
Nicolai Stange | 935244c | 2016-05-05 19:46:19 -0400 | [diff] [blame] | 2597 | unsigned offset, offset_incr; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2598 | unsigned max; |
Shen Feng | 74767c5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2599 | int ret; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2600 | |
Eric Sandeen | 1927805 | 2009-08-25 22:36:25 -0400 | [diff] [blame] | 2601 | i = (sb->s_blocksize_bits + 2) * sizeof(*sbi->s_mb_offsets); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2602 | |
| 2603 | sbi->s_mb_offsets = kmalloc(i, GFP_KERNEL); |
| 2604 | if (sbi->s_mb_offsets == NULL) { |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2605 | ret = -ENOMEM; |
| 2606 | goto out; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2607 | } |
Yasunori Goto | ff7ef32 | 2008-12-17 00:48:39 -0500 | [diff] [blame] | 2608 | |
Eric Sandeen | 1927805 | 2009-08-25 22:36:25 -0400 | [diff] [blame] | 2609 | i = (sb->s_blocksize_bits + 2) * sizeof(*sbi->s_mb_maxs); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2610 | sbi->s_mb_maxs = kmalloc(i, GFP_KERNEL); |
| 2611 | if (sbi->s_mb_maxs == NULL) { |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2612 | ret = -ENOMEM; |
| 2613 | goto out; |
| 2614 | } |
| 2615 | |
Eric Sandeen | 2892c15 | 2011-02-12 08:12:18 -0500 | [diff] [blame] | 2616 | ret = ext4_groupinfo_create_slab(sb->s_blocksize); |
| 2617 | if (ret < 0) |
| 2618 | goto out; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2619 | |
| 2620 | /* order 0 is regular bitmap */ |
| 2621 | sbi->s_mb_maxs[0] = sb->s_blocksize << 3; |
| 2622 | sbi->s_mb_offsets[0] = 0; |
| 2623 | |
| 2624 | i = 1; |
| 2625 | offset = 0; |
Nicolai Stange | 935244c | 2016-05-05 19:46:19 -0400 | [diff] [blame] | 2626 | offset_incr = 1 << (sb->s_blocksize_bits - 1); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2627 | max = sb->s_blocksize << 2; |
| 2628 | do { |
| 2629 | sbi->s_mb_offsets[i] = offset; |
| 2630 | sbi->s_mb_maxs[i] = max; |
Nicolai Stange | 935244c | 2016-05-05 19:46:19 -0400 | [diff] [blame] | 2631 | offset += offset_incr; |
| 2632 | offset_incr = offset_incr >> 1; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2633 | max = max >> 1; |
| 2634 | i++; |
| 2635 | } while (i <= sb->s_blocksize_bits + 1); |
| 2636 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2637 | spin_lock_init(&sbi->s_md_lock); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2638 | spin_lock_init(&sbi->s_bal_lock); |
Theodore Ts'o | d08854f | 2016-06-26 18:24:01 -0400 | [diff] [blame] | 2639 | sbi->s_mb_free_pending = 0; |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 2640 | INIT_LIST_HEAD(&sbi->s_freed_data_list); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2641 | |
| 2642 | sbi->s_mb_max_to_scan = MB_DEFAULT_MAX_TO_SCAN; |
| 2643 | sbi->s_mb_min_to_scan = MB_DEFAULT_MIN_TO_SCAN; |
| 2644 | sbi->s_mb_stats = MB_DEFAULT_STATS; |
| 2645 | sbi->s_mb_stream_request = MB_DEFAULT_STREAM_THRESHOLD; |
| 2646 | sbi->s_mb_order2_reqs = MB_DEFAULT_ORDER2_REQS; |
Theodore Ts'o | 27baebb | 2011-09-09 19:02:51 -0400 | [diff] [blame] | 2647 | /* |
| 2648 | * The default group preallocation is 512, which for 4k block |
| 2649 | * sizes translates to 2 megabytes. However for bigalloc file |
| 2650 | * systems, this is probably too big (i.e, if the cluster size |
| 2651 | * is 1 megabyte, then group preallocation size becomes half a |
| 2652 | * gigabyte!). As a default, we will keep a two megabyte |
| 2653 | * group pralloc size for cluster sizes up to 64k, and after |
| 2654 | * that, we will force a minimum group preallocation size of |
| 2655 | * 32 clusters. This translates to 8 megs when the cluster |
| 2656 | * size is 256k, and 32 megs when the cluster size is 1 meg, |
| 2657 | * which seems reasonable as a default. |
| 2658 | */ |
| 2659 | sbi->s_mb_group_prealloc = max(MB_DEFAULT_GROUP_PREALLOC >> |
| 2660 | sbi->s_cluster_bits, 32); |
Dan Ehrenberg | d7a1fee | 2011-07-17 21:11:30 -0400 | [diff] [blame] | 2661 | /* |
| 2662 | * If there is a s_stripe > 1, then we set the s_mb_group_prealloc |
| 2663 | * to the lowest multiple of s_stripe which is bigger than |
| 2664 | * the s_mb_group_prealloc as determined above. We want |
| 2665 | * the preallocation size to be an exact multiple of the |
| 2666 | * RAID stripe size so that preallocations don't fragment |
| 2667 | * the stripes. |
| 2668 | */ |
| 2669 | if (sbi->s_stripe > 1) { |
| 2670 | sbi->s_mb_group_prealloc = roundup( |
| 2671 | sbi->s_mb_group_prealloc, sbi->s_stripe); |
| 2672 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2673 | |
Eric Sandeen | 730c213 | 2008-09-13 15:23:29 -0400 | [diff] [blame] | 2674 | sbi->s_locality_groups = alloc_percpu(struct ext4_locality_group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2675 | if (sbi->s_locality_groups == NULL) { |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2676 | ret = -ENOMEM; |
Andrey Tsyvarev | 029b10c | 2014-05-12 12:34:21 -0400 | [diff] [blame] | 2677 | goto out; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2678 | } |
Eric Sandeen | 730c213 | 2008-09-13 15:23:29 -0400 | [diff] [blame] | 2679 | for_each_possible_cpu(i) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2680 | struct ext4_locality_group *lg; |
Eric Sandeen | 730c213 | 2008-09-13 15:23:29 -0400 | [diff] [blame] | 2681 | lg = per_cpu_ptr(sbi->s_locality_groups, i); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2682 | mutex_init(&lg->lg_mutex); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 2683 | for (j = 0; j < PREALLOC_TB_SIZE; j++) |
| 2684 | INIT_LIST_HEAD(&lg->lg_prealloc_list[j]); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2685 | spin_lock_init(&lg->lg_prealloc_lock); |
| 2686 | } |
| 2687 | |
Yu Jian | 79a77c5 | 2011-08-01 17:41:46 -0400 | [diff] [blame] | 2688 | /* init file for buddy data */ |
| 2689 | ret = ext4_mb_init_backend(sb); |
Tao Ma | 7aa0bae | 2011-10-06 10:22:28 -0400 | [diff] [blame] | 2690 | if (ret != 0) |
| 2691 | goto out_free_locality_groups; |
Yu Jian | 79a77c5 | 2011-08-01 17:41:46 -0400 | [diff] [blame] | 2692 | |
Tao Ma | 7aa0bae | 2011-10-06 10:22:28 -0400 | [diff] [blame] | 2693 | return 0; |
| 2694 | |
| 2695 | out_free_locality_groups: |
| 2696 | free_percpu(sbi->s_locality_groups); |
| 2697 | sbi->s_locality_groups = NULL; |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2698 | out: |
Tao Ma | 7aa0bae | 2011-10-06 10:22:28 -0400 | [diff] [blame] | 2699 | kfree(sbi->s_mb_offsets); |
| 2700 | sbi->s_mb_offsets = NULL; |
| 2701 | kfree(sbi->s_mb_maxs); |
| 2702 | sbi->s_mb_maxs = NULL; |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2703 | return ret; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2704 | } |
| 2705 | |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 2706 | /* need to called with the ext4 group lock held */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2707 | static void ext4_mb_cleanup_pa(struct ext4_group_info *grp) |
| 2708 | { |
| 2709 | struct ext4_prealloc_space *pa; |
| 2710 | struct list_head *cur, *tmp; |
| 2711 | int count = 0; |
| 2712 | |
| 2713 | list_for_each_safe(cur, tmp, &grp->bb_prealloc_list) { |
| 2714 | pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list); |
| 2715 | list_del(&pa->pa_group_list); |
| 2716 | count++; |
Aneesh Kumar K.V | 688f05a | 2008-10-13 12:14:14 -0400 | [diff] [blame] | 2717 | kmem_cache_free(ext4_pspace_cachep, pa); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2718 | } |
| 2719 | if (count) |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 2720 | mb_debug(1, "mballoc: %u PAs left\n", count); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2721 | |
| 2722 | } |
| 2723 | |
| 2724 | int ext4_mb_release(struct super_block *sb) |
| 2725 | { |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2726 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2727 | ext4_group_t i; |
| 2728 | int num_meta_group_infos; |
| 2729 | struct ext4_group_info *grinfo; |
| 2730 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2731 | struct kmem_cache *cachep = get_groupinfo_cache(sb->s_blocksize_bits); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2732 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2733 | if (sbi->s_group_info) { |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2734 | for (i = 0; i < ngroups; i++) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2735 | grinfo = ext4_get_group_info(sb, i); |
| 2736 | #ifdef DOUBLE_CHECK |
| 2737 | kfree(grinfo->bb_bitmap); |
| 2738 | #endif |
| 2739 | ext4_lock_group(sb, i); |
| 2740 | ext4_mb_cleanup_pa(grinfo); |
| 2741 | ext4_unlock_group(sb, i); |
Curt Wohlgemuth | fb1813f | 2010-10-27 21:29:12 -0400 | [diff] [blame] | 2742 | kmem_cache_free(cachep, grinfo); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2743 | } |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 2744 | num_meta_group_infos = (ngroups + |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2745 | EXT4_DESC_PER_BLOCK(sb) - 1) >> |
| 2746 | EXT4_DESC_PER_BLOCK_BITS(sb); |
| 2747 | for (i = 0; i < num_meta_group_infos; i++) |
| 2748 | kfree(sbi->s_group_info[i]); |
Al Viro | b93b41d | 2014-11-20 12:19:11 -0500 | [diff] [blame] | 2749 | kvfree(sbi->s_group_info); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2750 | } |
| 2751 | kfree(sbi->s_mb_offsets); |
| 2752 | kfree(sbi->s_mb_maxs); |
Markus Elfring | bfcba2d | 2014-11-25 20:01:37 -0500 | [diff] [blame] | 2753 | iput(sbi->s_buddy_cache); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2754 | if (sbi->s_mb_stats) { |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 2755 | ext4_msg(sb, KERN_INFO, |
| 2756 | "mballoc: %u blocks %u reqs (%u success)", |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2757 | atomic_read(&sbi->s_bal_allocated), |
| 2758 | atomic_read(&sbi->s_bal_reqs), |
| 2759 | atomic_read(&sbi->s_bal_success)); |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 2760 | ext4_msg(sb, KERN_INFO, |
| 2761 | "mballoc: %u extents scanned, %u goal hits, " |
| 2762 | "%u 2^N hits, %u breaks, %u lost", |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2763 | atomic_read(&sbi->s_bal_ex_scanned), |
| 2764 | atomic_read(&sbi->s_bal_goals), |
| 2765 | atomic_read(&sbi->s_bal_2orders), |
| 2766 | atomic_read(&sbi->s_bal_breaks), |
| 2767 | atomic_read(&sbi->s_mb_lost_chunks)); |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 2768 | ext4_msg(sb, KERN_INFO, |
| 2769 | "mballoc: %lu generated and it took %Lu", |
Tao Ma | ced156e | 2011-07-23 16:18:05 -0400 | [diff] [blame] | 2770 | sbi->s_mb_buddies_generated, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2771 | sbi->s_mb_generation_time); |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 2772 | ext4_msg(sb, KERN_INFO, |
| 2773 | "mballoc: %u preallocated, %u discarded", |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2774 | atomic_read(&sbi->s_mb_preallocated), |
| 2775 | atomic_read(&sbi->s_mb_discarded)); |
| 2776 | } |
| 2777 | |
Eric Sandeen | 730c213 | 2008-09-13 15:23:29 -0400 | [diff] [blame] | 2778 | free_percpu(sbi->s_locality_groups); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2779 | |
| 2780 | return 0; |
| 2781 | } |
| 2782 | |
Lukas Czerner | 77ca6cd | 2010-10-27 21:30:11 -0400 | [diff] [blame] | 2783 | static inline int ext4_issue_discard(struct super_block *sb, |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 2784 | ext4_group_t block_group, ext4_grpblk_t cluster, int count, |
| 2785 | struct bio **biop) |
Jiaying Zhang | 5c52183 | 2010-07-27 11:56:05 -0400 | [diff] [blame] | 2786 | { |
Jiaying Zhang | 5c52183 | 2010-07-27 11:56:05 -0400 | [diff] [blame] | 2787 | ext4_fsblk_t discard_block; |
| 2788 | |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 2789 | discard_block = (EXT4_C2B(EXT4_SB(sb), cluster) + |
| 2790 | ext4_group_first_block_no(sb, block_group)); |
| 2791 | count = EXT4_C2B(EXT4_SB(sb), count); |
Jiaying Zhang | 5c52183 | 2010-07-27 11:56:05 -0400 | [diff] [blame] | 2792 | trace_ext4_discard_blocks(sb, |
| 2793 | (unsigned long long) discard_block, count); |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 2794 | if (biop) { |
| 2795 | return __blkdev_issue_discard(sb->s_bdev, |
| 2796 | (sector_t)discard_block << (sb->s_blocksize_bits - 9), |
| 2797 | (sector_t)count << (sb->s_blocksize_bits - 9), |
| 2798 | GFP_NOFS, 0, biop); |
| 2799 | } else |
| 2800 | return sb_issue_discard(sb, discard_block, count, GFP_NOFS, 0); |
Jiaying Zhang | 5c52183 | 2010-07-27 11:56:05 -0400 | [diff] [blame] | 2801 | } |
| 2802 | |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 2803 | static void ext4_free_data_in_buddy(struct super_block *sb, |
| 2804 | struct ext4_free_data *entry) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2805 | { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2806 | struct ext4_buddy e4b; |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 2807 | struct ext4_group_info *db; |
Theodore Ts'o | d9f3450 | 2011-04-30 13:47:24 -0400 | [diff] [blame] | 2808 | int err, count = 0, count2 = 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2809 | |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 2810 | mb_debug(1, "gonna free %u blocks in group %u (0x%p):", |
| 2811 | entry->efd_count, entry->efd_group, entry); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2812 | |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 2813 | err = ext4_mb_load_buddy(sb, entry->efd_group, &e4b); |
| 2814 | /* we expect to find existing buddy because it's pinned */ |
| 2815 | BUG_ON(err != 0); |
Theodore Ts'o | b90f687 | 2010-04-20 16:51:59 -0400 | [diff] [blame] | 2816 | |
Theodore Ts'o | d08854f | 2016-06-26 18:24:01 -0400 | [diff] [blame] | 2817 | spin_lock(&EXT4_SB(sb)->s_md_lock); |
| 2818 | EXT4_SB(sb)->s_mb_free_pending -= entry->efd_count; |
| 2819 | spin_unlock(&EXT4_SB(sb)->s_md_lock); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2820 | |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 2821 | db = e4b.bd_info; |
| 2822 | /* there are blocks to put in buddy to make them really free */ |
| 2823 | count += entry->efd_count; |
| 2824 | count2++; |
| 2825 | ext4_lock_group(sb, entry->efd_group); |
| 2826 | /* Take it out of per group rb tree */ |
| 2827 | rb_erase(&entry->efd_node, &(db->bb_free_root)); |
| 2828 | mb_free_blocks(NULL, &e4b, entry->efd_start_cluster, entry->efd_count); |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 2829 | |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 2830 | /* |
| 2831 | * Clear the trimmed flag for the group so that the next |
| 2832 | * ext4_trim_fs can trim it. |
| 2833 | * If the volume is mounted with -o discard, online discard |
| 2834 | * is supported and the free blocks will be trimmed online. |
| 2835 | */ |
| 2836 | if (!test_opt(sb, DISCARD)) |
| 2837 | EXT4_MB_GRP_CLEAR_TRIMMED(db); |
| 2838 | |
| 2839 | if (!db->bb_free_root.rb_node) { |
| 2840 | /* No more items in the per group rb tree |
| 2841 | * balance refcounts from ext4_mb_free_metadata() |
Tao Ma | 3d56b8d | 2011-07-11 00:03:38 -0400 | [diff] [blame] | 2842 | */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 2843 | put_page(e4b.bd_buddy_page); |
| 2844 | put_page(e4b.bd_bitmap_page); |
Theodore Ts'o | 3e624fc | 2008-10-16 20:00:24 -0400 | [diff] [blame] | 2845 | } |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 2846 | ext4_unlock_group(sb, entry->efd_group); |
| 2847 | kmem_cache_free(ext4_free_data_cachep, entry); |
| 2848 | ext4_mb_unload_buddy(&e4b); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2849 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 2850 | mb_debug(1, "freed %u blocks in %u structures\n", count, count2); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2851 | } |
| 2852 | |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 2853 | /* |
| 2854 | * This function is called by the jbd2 layer once the commit has finished, |
| 2855 | * so we know we can free the blocks that were released with that commit. |
| 2856 | */ |
| 2857 | void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid) |
| 2858 | { |
| 2859 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 2860 | struct ext4_free_data *entry, *tmp; |
| 2861 | struct bio *discard_bio = NULL; |
| 2862 | struct list_head freed_data_list; |
| 2863 | struct list_head *cut_pos = NULL; |
| 2864 | int err; |
| 2865 | |
| 2866 | INIT_LIST_HEAD(&freed_data_list); |
| 2867 | |
| 2868 | spin_lock(&sbi->s_md_lock); |
| 2869 | list_for_each_entry(entry, &sbi->s_freed_data_list, efd_list) { |
| 2870 | if (entry->efd_tid != commit_tid) |
| 2871 | break; |
| 2872 | cut_pos = &entry->efd_list; |
| 2873 | } |
| 2874 | if (cut_pos) |
| 2875 | list_cut_position(&freed_data_list, &sbi->s_freed_data_list, |
| 2876 | cut_pos); |
| 2877 | spin_unlock(&sbi->s_md_lock); |
| 2878 | |
| 2879 | if (test_opt(sb, DISCARD)) { |
| 2880 | list_for_each_entry(entry, &freed_data_list, efd_list) { |
| 2881 | err = ext4_issue_discard(sb, entry->efd_group, |
| 2882 | entry->efd_start_cluster, |
| 2883 | entry->efd_count, |
| 2884 | &discard_bio); |
| 2885 | if (err && err != -EOPNOTSUPP) { |
| 2886 | ext4_msg(sb, KERN_WARNING, "discard request in" |
| 2887 | " group:%d block:%d count:%d failed" |
| 2888 | " with %d", entry->efd_group, |
| 2889 | entry->efd_start_cluster, |
| 2890 | entry->efd_count, err); |
| 2891 | } else if (err == -EOPNOTSUPP) |
| 2892 | break; |
| 2893 | } |
| 2894 | |
| 2895 | if (discard_bio) |
| 2896 | submit_bio_wait(discard_bio); |
| 2897 | } |
| 2898 | |
| 2899 | list_for_each_entry_safe(entry, tmp, &freed_data_list, efd_list) |
| 2900 | ext4_free_data_in_buddy(sb, entry); |
| 2901 | } |
| 2902 | |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2903 | int __init ext4_init_mballoc(void) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2904 | { |
Theodore Ts'o | 1682808 | 2010-10-27 21:30:09 -0400 | [diff] [blame] | 2905 | ext4_pspace_cachep = KMEM_CACHE(ext4_prealloc_space, |
| 2906 | SLAB_RECLAIM_ACCOUNT); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2907 | if (ext4_pspace_cachep == NULL) |
| 2908 | return -ENOMEM; |
| 2909 | |
Theodore Ts'o | 1682808 | 2010-10-27 21:30:09 -0400 | [diff] [blame] | 2910 | ext4_ac_cachep = KMEM_CACHE(ext4_allocation_context, |
| 2911 | SLAB_RECLAIM_ACCOUNT); |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 2912 | if (ext4_ac_cachep == NULL) { |
| 2913 | kmem_cache_destroy(ext4_pspace_cachep); |
| 2914 | return -ENOMEM; |
| 2915 | } |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 2916 | |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 2917 | ext4_free_data_cachep = KMEM_CACHE(ext4_free_data, |
| 2918 | SLAB_RECLAIM_ACCOUNT); |
| 2919 | if (ext4_free_data_cachep == NULL) { |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 2920 | kmem_cache_destroy(ext4_pspace_cachep); |
| 2921 | kmem_cache_destroy(ext4_ac_cachep); |
| 2922 | return -ENOMEM; |
| 2923 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2924 | return 0; |
| 2925 | } |
| 2926 | |
Theodore Ts'o | 5dabfc7 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 2927 | void ext4_exit_mballoc(void) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2928 | { |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 2929 | /* |
Jesper Dangaard Brouer | 3e03f9c | 2009-07-05 22:29:27 -0400 | [diff] [blame] | 2930 | * Wait for completion of call_rcu()'s on ext4_pspace_cachep |
| 2931 | * before destroying the slab cache. |
| 2932 | */ |
| 2933 | rcu_barrier(); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2934 | kmem_cache_destroy(ext4_pspace_cachep); |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 2935 | kmem_cache_destroy(ext4_ac_cachep); |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 2936 | kmem_cache_destroy(ext4_free_data_cachep); |
Eric Sandeen | 2892c15 | 2011-02-12 08:12:18 -0500 | [diff] [blame] | 2937 | ext4_groupinfo_destroy_slabs(); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2938 | } |
| 2939 | |
| 2940 | |
| 2941 | /* |
Uwe Kleine-König | 73b2c71 | 2010-07-30 21:02:47 +0200 | [diff] [blame] | 2942 | * Check quota and mark chosen space (ac->ac_b_ex) non-free in bitmaps |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2943 | * Returns 0 if success or error code |
| 2944 | */ |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 2945 | static noinline_for_stack int |
| 2946 | ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac, |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 2947 | handle_t *handle, unsigned int reserv_clstrs) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2948 | { |
| 2949 | struct buffer_head *bitmap_bh = NULL; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2950 | struct ext4_group_desc *gdp; |
| 2951 | struct buffer_head *gdp_bh; |
| 2952 | struct ext4_sb_info *sbi; |
| 2953 | struct super_block *sb; |
| 2954 | ext4_fsblk_t block; |
Aneesh Kumar K.V | 519deca0 | 2008-05-15 14:43:20 -0400 | [diff] [blame] | 2955 | int err, len; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2956 | |
| 2957 | BUG_ON(ac->ac_status != AC_STATUS_FOUND); |
| 2958 | BUG_ON(ac->ac_b_ex.fe_len <= 0); |
| 2959 | |
| 2960 | sb = ac->ac_sb; |
| 2961 | sbi = EXT4_SB(sb); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2962 | |
Theodore Ts'o | 574ca17 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2963 | bitmap_bh = ext4_read_block_bitmap(sb, ac->ac_b_ex.fe_group); |
Darrick J. Wong | 9008a58 | 2015-10-17 21:33:24 -0400 | [diff] [blame] | 2964 | if (IS_ERR(bitmap_bh)) { |
| 2965 | err = PTR_ERR(bitmap_bh); |
| 2966 | bitmap_bh = NULL; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2967 | goto out_err; |
Darrick J. Wong | 9008a58 | 2015-10-17 21:33:24 -0400 | [diff] [blame] | 2968 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2969 | |
liang xie | 5d60125 | 2014-05-12 22:06:43 -0400 | [diff] [blame] | 2970 | BUFFER_TRACE(bitmap_bh, "getting write access"); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2971 | err = ext4_journal_get_write_access(handle, bitmap_bh); |
| 2972 | if (err) |
| 2973 | goto out_err; |
| 2974 | |
| 2975 | err = -EIO; |
| 2976 | gdp = ext4_get_group_desc(sb, ac->ac_b_ex.fe_group, &gdp_bh); |
| 2977 | if (!gdp) |
| 2978 | goto out_err; |
| 2979 | |
Theodore Ts'o | a9df9a4 | 2009-01-05 22:18:16 -0500 | [diff] [blame] | 2980 | ext4_debug("using block group %u(%d)\n", ac->ac_b_ex.fe_group, |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 2981 | ext4_free_group_clusters(sb, gdp)); |
Aneesh Kumar K.V | 03cddb8 | 2008-06-05 20:59:29 -0400 | [diff] [blame] | 2982 | |
liang xie | 5d60125 | 2014-05-12 22:06:43 -0400 | [diff] [blame] | 2983 | BUFFER_TRACE(gdp_bh, "get_write_access"); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2984 | err = ext4_journal_get_write_access(handle, gdp_bh); |
| 2985 | if (err) |
| 2986 | goto out_err; |
| 2987 | |
Akinobu Mita | bda00de | 2010-03-03 23:53:25 -0500 | [diff] [blame] | 2988 | block = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 2989 | |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 2990 | len = EXT4_C2B(sbi, ac->ac_b_ex.fe_len); |
Theodore Ts'o | 6fd058f | 2009-05-17 15:38:01 -0400 | [diff] [blame] | 2991 | if (!ext4_data_block_valid(sbi, block, len)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 2992 | ext4_error(sb, "Allocating blocks %llu-%llu which overlap " |
Theodore Ts'o | 1084f25 | 2012-03-19 23:13:43 -0400 | [diff] [blame] | 2993 | "fs metadata", block, block+len); |
Aneesh Kumar K.V | 519deca0 | 2008-05-15 14:43:20 -0400 | [diff] [blame] | 2994 | /* File system mounted not to panic on error |
Vegard Nossum | 554a5cc | 2016-07-14 23:02:47 -0400 | [diff] [blame] | 2995 | * Fix the bitmap and return EFSCORRUPTED |
Aneesh Kumar K.V | 519deca0 | 2008-05-15 14:43:20 -0400 | [diff] [blame] | 2996 | * We leak some of the blocks here. |
| 2997 | */ |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 2998 | ext4_lock_group(sb, ac->ac_b_ex.fe_group); |
Yongqiang Yang | c3e94d1 | 2011-07-26 22:05:53 -0400 | [diff] [blame] | 2999 | ext4_set_bits(bitmap_bh->b_data, ac->ac_b_ex.fe_start, |
| 3000 | ac->ac_b_ex.fe_len); |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 3001 | ext4_unlock_group(sb, ac->ac_b_ex.fe_group); |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 3002 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); |
Aneesh Kumar K.V | 519deca0 | 2008-05-15 14:43:20 -0400 | [diff] [blame] | 3003 | if (!err) |
Vegard Nossum | 554a5cc | 2016-07-14 23:02:47 -0400 | [diff] [blame] | 3004 | err = -EFSCORRUPTED; |
Aneesh Kumar K.V | 519deca0 | 2008-05-15 14:43:20 -0400 | [diff] [blame] | 3005 | goto out_err; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3006 | } |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 3007 | |
| 3008 | ext4_lock_group(sb, ac->ac_b_ex.fe_group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3009 | #ifdef AGGRESSIVE_CHECK |
| 3010 | { |
| 3011 | int i; |
| 3012 | for (i = 0; i < ac->ac_b_ex.fe_len; i++) { |
| 3013 | BUG_ON(mb_test_bit(ac->ac_b_ex.fe_start + i, |
| 3014 | bitmap_bh->b_data)); |
| 3015 | } |
| 3016 | } |
| 3017 | #endif |
Yongqiang Yang | c3e94d1 | 2011-07-26 22:05:53 -0400 | [diff] [blame] | 3018 | ext4_set_bits(bitmap_bh->b_data, ac->ac_b_ex.fe_start, |
| 3019 | ac->ac_b_ex.fe_len); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3020 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
| 3021 | gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 3022 | ext4_free_group_clusters_set(sb, gdp, |
Theodore Ts'o | cff1dfd7 | 2011-09-09 19:12:51 -0400 | [diff] [blame] | 3023 | ext4_free_clusters_after_init(sb, |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 3024 | ac->ac_b_ex.fe_group, gdp)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3025 | } |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 3026 | len = ext4_free_group_clusters(sb, gdp) - ac->ac_b_ex.fe_len; |
| 3027 | ext4_free_group_clusters_set(sb, gdp, len); |
Tao Ma | 79f1ba4 | 2012-10-22 00:34:32 -0400 | [diff] [blame] | 3028 | ext4_block_bitmap_csum_set(sb, ac->ac_b_ex.fe_group, gdp, bitmap_bh); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 3029 | ext4_group_desc_csum_set(sb, ac->ac_b_ex.fe_group, gdp); |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 3030 | |
| 3031 | ext4_unlock_group(sb, ac->ac_b_ex.fe_group); |
Theodore Ts'o | 5704265 | 2011-09-09 18:56:51 -0400 | [diff] [blame] | 3032 | percpu_counter_sub(&sbi->s_freeclusters_counter, ac->ac_b_ex.fe_len); |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 3033 | /* |
Aneesh Kumar K.V | 6bc6e63 | 2008-10-10 09:39:00 -0400 | [diff] [blame] | 3034 | * Now reduce the dirty block count also. Should not go negative |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 3035 | */ |
Aneesh Kumar K.V | 6bc6e63 | 2008-10-10 09:39:00 -0400 | [diff] [blame] | 3036 | if (!(ac->ac_flags & EXT4_MB_DELALLOC_RESERVED)) |
| 3037 | /* release all the reserved blocks if non delalloc */ |
Theodore Ts'o | 5704265 | 2011-09-09 18:56:51 -0400 | [diff] [blame] | 3038 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
| 3039 | reserv_clstrs); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3040 | |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 3041 | if (sbi->s_log_groups_per_flex) { |
| 3042 | ext4_group_t flex_group = ext4_flex_group(sbi, |
| 3043 | ac->ac_b_ex.fe_group); |
Theodore Ts'o | 90ba983 | 2013-03-11 23:39:59 -0400 | [diff] [blame] | 3044 | atomic64_sub(ac->ac_b_ex.fe_len, |
| 3045 | &sbi->s_flex_groups[flex_group].free_clusters); |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 3046 | } |
| 3047 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 3048 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3049 | if (err) |
| 3050 | goto out_err; |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 3051 | err = ext4_handle_dirty_metadata(handle, NULL, gdp_bh); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3052 | |
| 3053 | out_err: |
Aneesh Kumar K.V | 42a10ad | 2008-02-10 01:07:28 -0500 | [diff] [blame] | 3054 | brelse(bitmap_bh); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3055 | return err; |
| 3056 | } |
| 3057 | |
| 3058 | /* |
| 3059 | * here we normalize request for locality group |
Dan Ehrenberg | d7a1fee | 2011-07-17 21:11:30 -0400 | [diff] [blame] | 3060 | * Group request are normalized to s_mb_group_prealloc, which goes to |
| 3061 | * s_strip if we set the same via mount option. |
| 3062 | * s_mb_group_prealloc can be configured via |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 3063 | * /sys/fs/ext4/<partition>/mb_group_prealloc |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3064 | * |
| 3065 | * XXX: should we try to preallocate more than the group has now? |
| 3066 | */ |
| 3067 | static void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac) |
| 3068 | { |
| 3069 | struct super_block *sb = ac->ac_sb; |
| 3070 | struct ext4_locality_group *lg = ac->ac_lg; |
| 3071 | |
| 3072 | BUG_ON(lg == NULL); |
Dan Ehrenberg | d7a1fee | 2011-07-17 21:11:30 -0400 | [diff] [blame] | 3073 | ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc; |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 3074 | mb_debug(1, "#%u: goal %u blocks for locality group\n", |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3075 | current->pid, ac->ac_g_ex.fe_len); |
| 3076 | } |
| 3077 | |
| 3078 | /* |
| 3079 | * Normalization means making request better in terms of |
| 3080 | * size and alignment |
| 3081 | */ |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3082 | static noinline_for_stack void |
| 3083 | ext4_mb_normalize_request(struct ext4_allocation_context *ac, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3084 | struct ext4_allocation_request *ar) |
| 3085 | { |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3086 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3087 | int bsbits, max; |
| 3088 | ext4_lblk_t end; |
Curt Wohlgemuth | 1592d2c | 2012-02-20 17:53:03 -0500 | [diff] [blame] | 3089 | loff_t size, start_off; |
| 3090 | loff_t orig_size __maybe_unused; |
Andi Kleen | 5a0790c | 2010-06-14 13:28:03 -0400 | [diff] [blame] | 3091 | ext4_lblk_t start; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3092 | struct ext4_inode_info *ei = EXT4_I(ac->ac_inode); |
Aneesh Kumar K.V | 9a0762c | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 3093 | struct ext4_prealloc_space *pa; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3094 | |
| 3095 | /* do normalize only data requests, metadata requests |
| 3096 | do not need preallocation */ |
| 3097 | if (!(ac->ac_flags & EXT4_MB_HINT_DATA)) |
| 3098 | return; |
| 3099 | |
| 3100 | /* sometime caller may want exact blocks */ |
| 3101 | if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY)) |
| 3102 | return; |
| 3103 | |
| 3104 | /* caller may indicate that preallocation isn't |
| 3105 | * required (it's a tail, for example) */ |
| 3106 | if (ac->ac_flags & EXT4_MB_HINT_NOPREALLOC) |
| 3107 | return; |
| 3108 | |
| 3109 | if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) { |
| 3110 | ext4_mb_normalize_group_request(ac); |
| 3111 | return ; |
| 3112 | } |
| 3113 | |
| 3114 | bsbits = ac->ac_sb->s_blocksize_bits; |
| 3115 | |
| 3116 | /* first, let's learn actual file size |
| 3117 | * given current request is allocated */ |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3118 | size = ac->ac_o_ex.fe_logical + EXT4_C2B(sbi, ac->ac_o_ex.fe_len); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3119 | size = size << bsbits; |
| 3120 | if (size < i_size_read(ac->ac_inode)) |
| 3121 | size = i_size_read(ac->ac_inode); |
Andi Kleen | 5a0790c | 2010-06-14 13:28:03 -0400 | [diff] [blame] | 3122 | orig_size = size; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3123 | |
Valerie Clement | 1930479 | 2008-05-13 19:31:14 -0400 | [diff] [blame] | 3124 | /* max size of free chunks */ |
| 3125 | max = 2 << bsbits; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3126 | |
Valerie Clement | 1930479 | 2008-05-13 19:31:14 -0400 | [diff] [blame] | 3127 | #define NRL_CHECK_SIZE(req, size, max, chunk_size) \ |
| 3128 | (req <= (size) || max <= (chunk_size)) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3129 | |
| 3130 | /* first, try to predict filesize */ |
| 3131 | /* XXX: should this table be tunable? */ |
| 3132 | start_off = 0; |
| 3133 | if (size <= 16 * 1024) { |
| 3134 | size = 16 * 1024; |
| 3135 | } else if (size <= 32 * 1024) { |
| 3136 | size = 32 * 1024; |
| 3137 | } else if (size <= 64 * 1024) { |
| 3138 | size = 64 * 1024; |
| 3139 | } else if (size <= 128 * 1024) { |
| 3140 | size = 128 * 1024; |
| 3141 | } else if (size <= 256 * 1024) { |
| 3142 | size = 256 * 1024; |
| 3143 | } else if (size <= 512 * 1024) { |
| 3144 | size = 512 * 1024; |
| 3145 | } else if (size <= 1024 * 1024) { |
| 3146 | size = 1024 * 1024; |
Valerie Clement | 1930479 | 2008-05-13 19:31:14 -0400 | [diff] [blame] | 3147 | } else if (NRL_CHECK_SIZE(size, 4 * 1024 * 1024, max, 2 * 1024)) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3148 | start_off = ((loff_t)ac->ac_o_ex.fe_logical >> |
Valerie Clement | 1930479 | 2008-05-13 19:31:14 -0400 | [diff] [blame] | 3149 | (21 - bsbits)) << 21; |
| 3150 | size = 2 * 1024 * 1024; |
| 3151 | } else if (NRL_CHECK_SIZE(size, 8 * 1024 * 1024, max, 4 * 1024)) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3152 | start_off = ((loff_t)ac->ac_o_ex.fe_logical >> |
| 3153 | (22 - bsbits)) << 22; |
| 3154 | size = 4 * 1024 * 1024; |
| 3155 | } else if (NRL_CHECK_SIZE(ac->ac_o_ex.fe_len, |
Valerie Clement | 1930479 | 2008-05-13 19:31:14 -0400 | [diff] [blame] | 3156 | (8<<20)>>bsbits, max, 8 * 1024)) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3157 | start_off = ((loff_t)ac->ac_o_ex.fe_logical >> |
| 3158 | (23 - bsbits)) << 23; |
| 3159 | size = 8 * 1024 * 1024; |
| 3160 | } else { |
Xiaoguang Wang | b27b153 | 2014-07-27 22:26:36 -0400 | [diff] [blame] | 3161 | start_off = (loff_t) ac->ac_o_ex.fe_logical << bsbits; |
| 3162 | size = (loff_t) EXT4_C2B(EXT4_SB(ac->ac_sb), |
| 3163 | ac->ac_o_ex.fe_len) << bsbits; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3164 | } |
Andi Kleen | 5a0790c | 2010-06-14 13:28:03 -0400 | [diff] [blame] | 3165 | size = size >> bsbits; |
| 3166 | start = start_off >> bsbits; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3167 | |
| 3168 | /* don't cover already allocated blocks in selected range */ |
| 3169 | if (ar->pleft && start <= ar->lleft) { |
| 3170 | size -= ar->lleft + 1 - start; |
| 3171 | start = ar->lleft + 1; |
| 3172 | } |
| 3173 | if (ar->pright && start + size - 1 >= ar->lright) |
| 3174 | size -= start + size - ar->lright; |
| 3175 | |
Jan Kara | cd648b8 | 2017-01-27 14:34:30 -0500 | [diff] [blame] | 3176 | /* |
| 3177 | * Trim allocation request for filesystems with artificially small |
| 3178 | * groups. |
| 3179 | */ |
| 3180 | if (size > EXT4_BLOCKS_PER_GROUP(ac->ac_sb)) |
| 3181 | size = EXT4_BLOCKS_PER_GROUP(ac->ac_sb); |
| 3182 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3183 | end = start + size; |
| 3184 | |
| 3185 | /* check we don't cross already preallocated blocks */ |
| 3186 | rcu_read_lock(); |
Aneesh Kumar K.V | 9a0762c | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 3187 | list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 3188 | ext4_lblk_t pa_end; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3189 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3190 | if (pa->pa_deleted) |
| 3191 | continue; |
| 3192 | spin_lock(&pa->pa_lock); |
| 3193 | if (pa->pa_deleted) { |
| 3194 | spin_unlock(&pa->pa_lock); |
| 3195 | continue; |
| 3196 | } |
| 3197 | |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3198 | pa_end = pa->pa_lstart + EXT4_C2B(EXT4_SB(ac->ac_sb), |
| 3199 | pa->pa_len); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3200 | |
| 3201 | /* PA must not overlap original request */ |
| 3202 | BUG_ON(!(ac->ac_o_ex.fe_logical >= pa_end || |
| 3203 | ac->ac_o_ex.fe_logical < pa->pa_lstart)); |
| 3204 | |
Eric Sandeen | 38877f4 | 2009-08-17 23:55:24 -0400 | [diff] [blame] | 3205 | /* skip PAs this normalized request doesn't overlap with */ |
| 3206 | if (pa->pa_lstart >= end || pa_end <= start) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3207 | spin_unlock(&pa->pa_lock); |
| 3208 | continue; |
| 3209 | } |
| 3210 | BUG_ON(pa->pa_lstart <= start && pa_end >= end); |
| 3211 | |
Eric Sandeen | 38877f4 | 2009-08-17 23:55:24 -0400 | [diff] [blame] | 3212 | /* adjust start or end to be adjacent to this pa */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3213 | if (pa_end <= ac->ac_o_ex.fe_logical) { |
| 3214 | BUG_ON(pa_end < start); |
| 3215 | start = pa_end; |
Eric Sandeen | 38877f4 | 2009-08-17 23:55:24 -0400 | [diff] [blame] | 3216 | } else if (pa->pa_lstart > ac->ac_o_ex.fe_logical) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3217 | BUG_ON(pa->pa_lstart > end); |
| 3218 | end = pa->pa_lstart; |
| 3219 | } |
| 3220 | spin_unlock(&pa->pa_lock); |
| 3221 | } |
| 3222 | rcu_read_unlock(); |
| 3223 | size = end - start; |
| 3224 | |
| 3225 | /* XXX: extra loop to check we really don't overlap preallocations */ |
| 3226 | rcu_read_lock(); |
Aneesh Kumar K.V | 9a0762c | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 3227 | list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) { |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 3228 | ext4_lblk_t pa_end; |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3229 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3230 | spin_lock(&pa->pa_lock); |
| 3231 | if (pa->pa_deleted == 0) { |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3232 | pa_end = pa->pa_lstart + EXT4_C2B(EXT4_SB(ac->ac_sb), |
| 3233 | pa->pa_len); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3234 | BUG_ON(!(start >= pa_end || end <= pa->pa_lstart)); |
| 3235 | } |
| 3236 | spin_unlock(&pa->pa_lock); |
| 3237 | } |
| 3238 | rcu_read_unlock(); |
| 3239 | |
| 3240 | if (start + size <= ac->ac_o_ex.fe_logical && |
| 3241 | start > ac->ac_o_ex.fe_logical) { |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 3242 | ext4_msg(ac->ac_sb, KERN_ERR, |
| 3243 | "start %lu, size %lu, fe_logical %lu", |
| 3244 | (unsigned long) start, (unsigned long) size, |
| 3245 | (unsigned long) ac->ac_o_ex.fe_logical); |
Dmitry Monakhov | dfe076c | 2014-10-01 22:26:17 -0400 | [diff] [blame] | 3246 | BUG(); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3247 | } |
Maurizio Lombardi | b5b6077 | 2014-05-27 12:48:56 -0400 | [diff] [blame] | 3248 | BUG_ON(size <= 0 || size > EXT4_BLOCKS_PER_GROUP(ac->ac_sb)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3249 | |
| 3250 | /* now prepare goal request */ |
| 3251 | |
| 3252 | /* XXX: is it better to align blocks WRT to logical |
| 3253 | * placement or satisfy big request as is */ |
| 3254 | ac->ac_g_ex.fe_logical = start; |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3255 | ac->ac_g_ex.fe_len = EXT4_NUM_B2C(sbi, size); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3256 | |
| 3257 | /* define goal start in order to merge */ |
| 3258 | if (ar->pright && (ar->lright == (start + size))) { |
| 3259 | /* merge to the right */ |
| 3260 | ext4_get_group_no_and_offset(ac->ac_sb, ar->pright - size, |
| 3261 | &ac->ac_f_ex.fe_group, |
| 3262 | &ac->ac_f_ex.fe_start); |
| 3263 | ac->ac_flags |= EXT4_MB_HINT_TRY_GOAL; |
| 3264 | } |
| 3265 | if (ar->pleft && (ar->lleft + 1 == start)) { |
| 3266 | /* merge to the left */ |
| 3267 | ext4_get_group_no_and_offset(ac->ac_sb, ar->pleft + 1, |
| 3268 | &ac->ac_f_ex.fe_group, |
| 3269 | &ac->ac_f_ex.fe_start); |
| 3270 | ac->ac_flags |= EXT4_MB_HINT_TRY_GOAL; |
| 3271 | } |
| 3272 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 3273 | mb_debug(1, "goal: %u(was %u) blocks at %u\n", (unsigned) size, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3274 | (unsigned) orig_size, (unsigned) start); |
| 3275 | } |
| 3276 | |
| 3277 | static void ext4_mb_collect_stats(struct ext4_allocation_context *ac) |
| 3278 | { |
| 3279 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
| 3280 | |
| 3281 | if (sbi->s_mb_stats && ac->ac_g_ex.fe_len > 1) { |
| 3282 | atomic_inc(&sbi->s_bal_reqs); |
| 3283 | atomic_add(ac->ac_b_ex.fe_len, &sbi->s_bal_allocated); |
Curt Wohlgemuth | 291dae4 | 2010-05-16 16:00:00 -0400 | [diff] [blame] | 3284 | if (ac->ac_b_ex.fe_len >= ac->ac_o_ex.fe_len) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3285 | atomic_inc(&sbi->s_bal_success); |
| 3286 | atomic_add(ac->ac_found, &sbi->s_bal_ex_scanned); |
| 3287 | if (ac->ac_g_ex.fe_start == ac->ac_b_ex.fe_start && |
| 3288 | ac->ac_g_ex.fe_group == ac->ac_b_ex.fe_group) |
| 3289 | atomic_inc(&sbi->s_bal_goals); |
| 3290 | if (ac->ac_found > sbi->s_mb_max_to_scan) |
| 3291 | atomic_inc(&sbi->s_bal_breaks); |
| 3292 | } |
| 3293 | |
Theodore Ts'o | 296c355 | 2009-09-30 00:32:42 -0400 | [diff] [blame] | 3294 | if (ac->ac_op == EXT4_MB_HISTORY_ALLOC) |
| 3295 | trace_ext4_mballoc_alloc(ac); |
| 3296 | else |
| 3297 | trace_ext4_mballoc_prealloc(ac); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3298 | } |
| 3299 | |
| 3300 | /* |
Curt Wohlgemuth | b844167 | 2009-12-08 22:18:25 -0500 | [diff] [blame] | 3301 | * Called on failure; free up any blocks from the inode PA for this |
| 3302 | * context. We don't need this for MB_GROUP_PA because we only change |
| 3303 | * pa_free in ext4_mb_release_context(), but on failure, we've already |
| 3304 | * zeroed out ac->ac_b_ex.fe_len, so group_pa->pa_free is not changed. |
| 3305 | */ |
| 3306 | static void ext4_discard_allocated_blocks(struct ext4_allocation_context *ac) |
| 3307 | { |
| 3308 | struct ext4_prealloc_space *pa = ac->ac_pa; |
Theodore Ts'o | 86f0afd | 2014-07-30 22:17:17 -0400 | [diff] [blame] | 3309 | struct ext4_buddy e4b; |
| 3310 | int err; |
Curt Wohlgemuth | b844167 | 2009-12-08 22:18:25 -0500 | [diff] [blame] | 3311 | |
Theodore Ts'o | 86f0afd | 2014-07-30 22:17:17 -0400 | [diff] [blame] | 3312 | if (pa == NULL) { |
Theodore Ts'o | c99d1e6 | 2014-08-23 17:47:28 -0400 | [diff] [blame] | 3313 | if (ac->ac_f_ex.fe_len == 0) |
| 3314 | return; |
Theodore Ts'o | 86f0afd | 2014-07-30 22:17:17 -0400 | [diff] [blame] | 3315 | err = ext4_mb_load_buddy(ac->ac_sb, ac->ac_f_ex.fe_group, &e4b); |
| 3316 | if (err) { |
| 3317 | /* |
| 3318 | * This should never happen since we pin the |
| 3319 | * pages in the ext4_allocation_context so |
| 3320 | * ext4_mb_load_buddy() should never fail. |
| 3321 | */ |
| 3322 | WARN(1, "mb_load_buddy failed (%d)", err); |
| 3323 | return; |
| 3324 | } |
| 3325 | ext4_lock_group(ac->ac_sb, ac->ac_f_ex.fe_group); |
| 3326 | mb_free_blocks(ac->ac_inode, &e4b, ac->ac_f_ex.fe_start, |
| 3327 | ac->ac_f_ex.fe_len); |
| 3328 | ext4_unlock_group(ac->ac_sb, ac->ac_f_ex.fe_group); |
Theodore Ts'o | c99d1e6 | 2014-08-23 17:47:28 -0400 | [diff] [blame] | 3329 | ext4_mb_unload_buddy(&e4b); |
Theodore Ts'o | 86f0afd | 2014-07-30 22:17:17 -0400 | [diff] [blame] | 3330 | return; |
| 3331 | } |
| 3332 | if (pa->pa_type == MB_INODE_PA) |
Zheng Liu | 400db9d | 2012-05-28 17:53:53 -0400 | [diff] [blame] | 3333 | pa->pa_free += ac->ac_b_ex.fe_len; |
Curt Wohlgemuth | b844167 | 2009-12-08 22:18:25 -0500 | [diff] [blame] | 3334 | } |
| 3335 | |
| 3336 | /* |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3337 | * use blocks preallocated to inode |
| 3338 | */ |
| 3339 | static void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac, |
| 3340 | struct ext4_prealloc_space *pa) |
| 3341 | { |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3342 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3343 | ext4_fsblk_t start; |
| 3344 | ext4_fsblk_t end; |
| 3345 | int len; |
| 3346 | |
| 3347 | /* found preallocated blocks, use them */ |
| 3348 | start = pa->pa_pstart + (ac->ac_o_ex.fe_logical - pa->pa_lstart); |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3349 | end = min(pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len), |
| 3350 | start + EXT4_C2B(sbi, ac->ac_o_ex.fe_len)); |
| 3351 | len = EXT4_NUM_B2C(sbi, end - start); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3352 | ext4_get_group_no_and_offset(ac->ac_sb, start, &ac->ac_b_ex.fe_group, |
| 3353 | &ac->ac_b_ex.fe_start); |
| 3354 | ac->ac_b_ex.fe_len = len; |
| 3355 | ac->ac_status = AC_STATUS_FOUND; |
| 3356 | ac->ac_pa = pa; |
| 3357 | |
| 3358 | BUG_ON(start < pa->pa_pstart); |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3359 | BUG_ON(end > pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3360 | BUG_ON(pa->pa_free < len); |
| 3361 | pa->pa_free -= len; |
| 3362 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 3363 | mb_debug(1, "use %llu/%u from inode pa %p\n", start, len, pa); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3364 | } |
| 3365 | |
| 3366 | /* |
| 3367 | * use blocks preallocated to locality group |
| 3368 | */ |
| 3369 | static void ext4_mb_use_group_pa(struct ext4_allocation_context *ac, |
| 3370 | struct ext4_prealloc_space *pa) |
| 3371 | { |
Aneesh Kumar K.V | 03cddb8 | 2008-06-05 20:59:29 -0400 | [diff] [blame] | 3372 | unsigned int len = ac->ac_o_ex.fe_len; |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 3373 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3374 | ext4_get_group_no_and_offset(ac->ac_sb, pa->pa_pstart, |
| 3375 | &ac->ac_b_ex.fe_group, |
| 3376 | &ac->ac_b_ex.fe_start); |
| 3377 | ac->ac_b_ex.fe_len = len; |
| 3378 | ac->ac_status = AC_STATUS_FOUND; |
| 3379 | ac->ac_pa = pa; |
| 3380 | |
| 3381 | /* we don't correct pa_pstart or pa_plen here to avoid |
Aneesh Kumar K.V | 26346ff | 2008-02-10 01:10:04 -0500 | [diff] [blame] | 3382 | * possible race when the group is being loaded concurrently |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3383 | * instead we correct pa later, after blocks are marked |
Aneesh Kumar K.V | 26346ff | 2008-02-10 01:10:04 -0500 | [diff] [blame] | 3384 | * in on-disk bitmap -- see ext4_mb_release_context() |
| 3385 | * Other CPUs are prevented from allocating from this pa by lg_mutex |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3386 | */ |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 3387 | mb_debug(1, "use %u/%u from group pa %p\n", pa->pa_lstart-len, len, pa); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3388 | } |
| 3389 | |
| 3390 | /* |
Aneesh Kumar K.V | 5e745b0 | 2008-08-18 18:00:57 -0400 | [diff] [blame] | 3391 | * Return the prealloc space that have minimal distance |
| 3392 | * from the goal block. @cpa is the prealloc |
| 3393 | * space that is having currently known minimal distance |
| 3394 | * from the goal block. |
| 3395 | */ |
| 3396 | static struct ext4_prealloc_space * |
| 3397 | ext4_mb_check_group_pa(ext4_fsblk_t goal_block, |
| 3398 | struct ext4_prealloc_space *pa, |
| 3399 | struct ext4_prealloc_space *cpa) |
| 3400 | { |
| 3401 | ext4_fsblk_t cur_distance, new_distance; |
| 3402 | |
| 3403 | if (cpa == NULL) { |
| 3404 | atomic_inc(&pa->pa_count); |
| 3405 | return pa; |
| 3406 | } |
Andrew Morton | 79211c8 | 2015-11-09 14:58:13 -0800 | [diff] [blame] | 3407 | cur_distance = abs(goal_block - cpa->pa_pstart); |
| 3408 | new_distance = abs(goal_block - pa->pa_pstart); |
Aneesh Kumar K.V | 5e745b0 | 2008-08-18 18:00:57 -0400 | [diff] [blame] | 3409 | |
Coly Li | 5a54b2f | 2011-02-24 14:10:05 -0500 | [diff] [blame] | 3410 | if (cur_distance <= new_distance) |
Aneesh Kumar K.V | 5e745b0 | 2008-08-18 18:00:57 -0400 | [diff] [blame] | 3411 | return cpa; |
| 3412 | |
| 3413 | /* drop the previous reference */ |
| 3414 | atomic_dec(&cpa->pa_count); |
| 3415 | atomic_inc(&pa->pa_count); |
| 3416 | return pa; |
| 3417 | } |
| 3418 | |
| 3419 | /* |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3420 | * search goal blocks in preallocated space |
| 3421 | */ |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3422 | static noinline_for_stack int |
| 3423 | ext4_mb_use_preallocated(struct ext4_allocation_context *ac) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3424 | { |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3425 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 3426 | int order, i; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3427 | struct ext4_inode_info *ei = EXT4_I(ac->ac_inode); |
| 3428 | struct ext4_locality_group *lg; |
Aneesh Kumar K.V | 5e745b0 | 2008-08-18 18:00:57 -0400 | [diff] [blame] | 3429 | struct ext4_prealloc_space *pa, *cpa = NULL; |
| 3430 | ext4_fsblk_t goal_block; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3431 | |
| 3432 | /* only data can be preallocated */ |
| 3433 | if (!(ac->ac_flags & EXT4_MB_HINT_DATA)) |
| 3434 | return 0; |
| 3435 | |
| 3436 | /* first, try per-file preallocation */ |
| 3437 | rcu_read_lock(); |
Aneesh Kumar K.V | 9a0762c | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 3438 | list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3439 | |
| 3440 | /* all fields in this condition don't change, |
| 3441 | * so we can skip locking for them */ |
| 3442 | if (ac->ac_o_ex.fe_logical < pa->pa_lstart || |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3443 | ac->ac_o_ex.fe_logical >= (pa->pa_lstart + |
| 3444 | EXT4_C2B(sbi, pa->pa_len))) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3445 | continue; |
| 3446 | |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 3447 | /* non-extent files can't have physical blocks past 2^32 */ |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 3448 | if (!(ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS)) && |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3449 | (pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len) > |
| 3450 | EXT4_MAX_BLOCK_FILE_PHYS)) |
Eric Sandeen | fb0a387 | 2009-09-16 14:45:10 -0400 | [diff] [blame] | 3451 | continue; |
| 3452 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3453 | /* found preallocated blocks, use them */ |
| 3454 | spin_lock(&pa->pa_lock); |
| 3455 | if (pa->pa_deleted == 0 && pa->pa_free) { |
| 3456 | atomic_inc(&pa->pa_count); |
| 3457 | ext4_mb_use_inode_pa(ac, pa); |
| 3458 | spin_unlock(&pa->pa_lock); |
| 3459 | ac->ac_criteria = 10; |
| 3460 | rcu_read_unlock(); |
| 3461 | return 1; |
| 3462 | } |
| 3463 | spin_unlock(&pa->pa_lock); |
| 3464 | } |
| 3465 | rcu_read_unlock(); |
| 3466 | |
| 3467 | /* can we use group allocation? */ |
| 3468 | if (!(ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC)) |
| 3469 | return 0; |
| 3470 | |
| 3471 | /* inode may have no locality group for some reason */ |
| 3472 | lg = ac->ac_lg; |
| 3473 | if (lg == NULL) |
| 3474 | return 0; |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 3475 | order = fls(ac->ac_o_ex.fe_len) - 1; |
| 3476 | if (order > PREALLOC_TB_SIZE - 1) |
| 3477 | /* The max size of hash table is PREALLOC_TB_SIZE */ |
| 3478 | order = PREALLOC_TB_SIZE - 1; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3479 | |
Akinobu Mita | bda00de | 2010-03-03 23:53:25 -0500 | [diff] [blame] | 3480 | goal_block = ext4_grp_offs_to_block(ac->ac_sb, &ac->ac_g_ex); |
Aneesh Kumar K.V | 5e745b0 | 2008-08-18 18:00:57 -0400 | [diff] [blame] | 3481 | /* |
| 3482 | * search for the prealloc space that is having |
| 3483 | * minimal distance from the goal block. |
| 3484 | */ |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 3485 | for (i = order; i < PREALLOC_TB_SIZE; i++) { |
| 3486 | rcu_read_lock(); |
| 3487 | list_for_each_entry_rcu(pa, &lg->lg_prealloc_list[i], |
| 3488 | pa_inode_list) { |
| 3489 | spin_lock(&pa->pa_lock); |
| 3490 | if (pa->pa_deleted == 0 && |
| 3491 | pa->pa_free >= ac->ac_o_ex.fe_len) { |
Aneesh Kumar K.V | 5e745b0 | 2008-08-18 18:00:57 -0400 | [diff] [blame] | 3492 | |
| 3493 | cpa = ext4_mb_check_group_pa(goal_block, |
| 3494 | pa, cpa); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 3495 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3496 | spin_unlock(&pa->pa_lock); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3497 | } |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 3498 | rcu_read_unlock(); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3499 | } |
Aneesh Kumar K.V | 5e745b0 | 2008-08-18 18:00:57 -0400 | [diff] [blame] | 3500 | if (cpa) { |
| 3501 | ext4_mb_use_group_pa(ac, cpa); |
| 3502 | ac->ac_criteria = 20; |
| 3503 | return 1; |
| 3504 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3505 | return 0; |
| 3506 | } |
| 3507 | |
| 3508 | /* |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 3509 | * the function goes through all block freed in the group |
| 3510 | * but not yet committed and marks them used in in-core bitmap. |
| 3511 | * buddy must be generated from this bitmap |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 3512 | * Need to be called with the ext4 group lock held |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 3513 | */ |
| 3514 | static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap, |
| 3515 | ext4_group_t group) |
| 3516 | { |
| 3517 | struct rb_node *n; |
| 3518 | struct ext4_group_info *grp; |
| 3519 | struct ext4_free_data *entry; |
| 3520 | |
| 3521 | grp = ext4_get_group_info(sb, group); |
| 3522 | n = rb_first(&(grp->bb_free_root)); |
| 3523 | |
| 3524 | while (n) { |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 3525 | entry = rb_entry(n, struct ext4_free_data, efd_node); |
| 3526 | ext4_set_bits(bitmap, entry->efd_start_cluster, entry->efd_count); |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 3527 | n = rb_next(n); |
| 3528 | } |
| 3529 | return; |
| 3530 | } |
| 3531 | |
| 3532 | /* |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3533 | * the function goes through all preallocation in this group and marks them |
| 3534 | * used in in-core bitmap. buddy must be generated from this bitmap |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 3535 | * Need to be called with ext4 group lock held |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3536 | */ |
Eric Sandeen | 089ceec | 2009-07-05 22:17:31 -0400 | [diff] [blame] | 3537 | static noinline_for_stack |
| 3538 | void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3539 | ext4_group_t group) |
| 3540 | { |
| 3541 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); |
| 3542 | struct ext4_prealloc_space *pa; |
| 3543 | struct list_head *cur; |
| 3544 | ext4_group_t groupnr; |
| 3545 | ext4_grpblk_t start; |
| 3546 | int preallocated = 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3547 | int len; |
| 3548 | |
| 3549 | /* all form of preallocation discards first load group, |
| 3550 | * so the only competing code is preallocation use. |
| 3551 | * we don't need any locking here |
| 3552 | * notice we do NOT ignore preallocations with pa_deleted |
| 3553 | * otherwise we could leave used blocks available for |
| 3554 | * allocation in buddy when concurrent ext4_mb_put_pa() |
| 3555 | * is dropping preallocation |
| 3556 | */ |
| 3557 | list_for_each(cur, &grp->bb_prealloc_list) { |
| 3558 | pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list); |
| 3559 | spin_lock(&pa->pa_lock); |
| 3560 | ext4_get_group_no_and_offset(sb, pa->pa_pstart, |
| 3561 | &groupnr, &start); |
| 3562 | len = pa->pa_len; |
| 3563 | spin_unlock(&pa->pa_lock); |
| 3564 | if (unlikely(len == 0)) |
| 3565 | continue; |
| 3566 | BUG_ON(groupnr != group); |
Yongqiang Yang | c3e94d1 | 2011-07-26 22:05:53 -0400 | [diff] [blame] | 3567 | ext4_set_bits(bitmap, start, len); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3568 | preallocated += len; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3569 | } |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 3570 | mb_debug(1, "prellocated %u for group %u\n", preallocated, group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3571 | } |
| 3572 | |
| 3573 | static void ext4_mb_pa_callback(struct rcu_head *head) |
| 3574 | { |
| 3575 | struct ext4_prealloc_space *pa; |
| 3576 | pa = container_of(head, struct ext4_prealloc_space, u.pa_rcu); |
Junho Ryu | 4e8d213 | 2013-12-03 18:10:28 -0500 | [diff] [blame] | 3577 | |
| 3578 | BUG_ON(atomic_read(&pa->pa_count)); |
| 3579 | BUG_ON(pa->pa_deleted == 0); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3580 | kmem_cache_free(ext4_pspace_cachep, pa); |
| 3581 | } |
| 3582 | |
| 3583 | /* |
| 3584 | * drops a reference to preallocated space descriptor |
| 3585 | * if this was the last reference and the space is consumed |
| 3586 | */ |
| 3587 | static void ext4_mb_put_pa(struct ext4_allocation_context *ac, |
| 3588 | struct super_block *sb, struct ext4_prealloc_space *pa) |
| 3589 | { |
Theodore Ts'o | a9df9a4 | 2009-01-05 22:18:16 -0500 | [diff] [blame] | 3590 | ext4_group_t grp; |
Eric Sandeen | d33a197 | 2009-03-16 23:25:40 -0400 | [diff] [blame] | 3591 | ext4_fsblk_t grp_blk; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3592 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3593 | /* in this short window concurrent discard can set pa_deleted */ |
| 3594 | spin_lock(&pa->pa_lock); |
Junho Ryu | 4e8d213 | 2013-12-03 18:10:28 -0500 | [diff] [blame] | 3595 | if (!atomic_dec_and_test(&pa->pa_count) || pa->pa_free != 0) { |
| 3596 | spin_unlock(&pa->pa_lock); |
| 3597 | return; |
| 3598 | } |
| 3599 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3600 | if (pa->pa_deleted == 1) { |
| 3601 | spin_unlock(&pa->pa_lock); |
| 3602 | return; |
| 3603 | } |
| 3604 | |
| 3605 | pa->pa_deleted = 1; |
| 3606 | spin_unlock(&pa->pa_lock); |
| 3607 | |
Eric Sandeen | d33a197 | 2009-03-16 23:25:40 -0400 | [diff] [blame] | 3608 | grp_blk = pa->pa_pstart; |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 3609 | /* |
Aneesh Kumar K.V | cc0fb9a | 2009-03-27 17:16:58 -0400 | [diff] [blame] | 3610 | * If doing group-based preallocation, pa_pstart may be in the |
| 3611 | * next group when pa is used up |
| 3612 | */ |
| 3613 | if (pa->pa_type == MB_GROUP_PA) |
Eric Sandeen | d33a197 | 2009-03-16 23:25:40 -0400 | [diff] [blame] | 3614 | grp_blk--; |
| 3615 | |
Lukas Czerner | bd86298 | 2013-04-03 23:32:34 -0400 | [diff] [blame] | 3616 | grp = ext4_get_group_number(sb, grp_blk); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3617 | |
| 3618 | /* |
| 3619 | * possible race: |
| 3620 | * |
| 3621 | * P1 (buddy init) P2 (regular allocation) |
| 3622 | * find block B in PA |
| 3623 | * copy on-disk bitmap to buddy |
| 3624 | * mark B in on-disk bitmap |
| 3625 | * drop PA from group |
| 3626 | * mark all PAs in buddy |
| 3627 | * |
| 3628 | * thus, P1 initializes buddy with B available. to prevent this |
| 3629 | * we make "copy" and "mark all PAs" atomic and serialize "drop PA" |
| 3630 | * against that pair |
| 3631 | */ |
| 3632 | ext4_lock_group(sb, grp); |
| 3633 | list_del(&pa->pa_group_list); |
| 3634 | ext4_unlock_group(sb, grp); |
| 3635 | |
| 3636 | spin_lock(pa->pa_obj_lock); |
| 3637 | list_del_rcu(&pa->pa_inode_list); |
| 3638 | spin_unlock(pa->pa_obj_lock); |
| 3639 | |
| 3640 | call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); |
| 3641 | } |
| 3642 | |
| 3643 | /* |
| 3644 | * creates new preallocated space for given inode |
| 3645 | */ |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3646 | static noinline_for_stack int |
| 3647 | ext4_mb_new_inode_pa(struct ext4_allocation_context *ac) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3648 | { |
| 3649 | struct super_block *sb = ac->ac_sb; |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3650 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3651 | struct ext4_prealloc_space *pa; |
| 3652 | struct ext4_group_info *grp; |
| 3653 | struct ext4_inode_info *ei; |
| 3654 | |
| 3655 | /* preallocate only when found space is larger then requested */ |
| 3656 | BUG_ON(ac->ac_o_ex.fe_len >= ac->ac_b_ex.fe_len); |
| 3657 | BUG_ON(ac->ac_status != AC_STATUS_FOUND); |
| 3658 | BUG_ON(!S_ISREG(ac->ac_inode->i_mode)); |
| 3659 | |
| 3660 | pa = kmem_cache_alloc(ext4_pspace_cachep, GFP_NOFS); |
| 3661 | if (pa == NULL) |
| 3662 | return -ENOMEM; |
| 3663 | |
| 3664 | if (ac->ac_b_ex.fe_len < ac->ac_g_ex.fe_len) { |
| 3665 | int winl; |
| 3666 | int wins; |
| 3667 | int win; |
| 3668 | int offs; |
| 3669 | |
| 3670 | /* we can't allocate as much as normalizer wants. |
| 3671 | * so, found space must get proper lstart |
| 3672 | * to cover original request */ |
| 3673 | BUG_ON(ac->ac_g_ex.fe_logical > ac->ac_o_ex.fe_logical); |
| 3674 | BUG_ON(ac->ac_g_ex.fe_len < ac->ac_o_ex.fe_len); |
| 3675 | |
| 3676 | /* we're limited by original request in that |
| 3677 | * logical block must be covered any way |
| 3678 | * winl is window we can move our chunk within */ |
| 3679 | winl = ac->ac_o_ex.fe_logical - ac->ac_g_ex.fe_logical; |
| 3680 | |
| 3681 | /* also, we should cover whole original request */ |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3682 | wins = EXT4_C2B(sbi, ac->ac_b_ex.fe_len - ac->ac_o_ex.fe_len); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3683 | |
| 3684 | /* the smallest one defines real window */ |
| 3685 | win = min(winl, wins); |
| 3686 | |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3687 | offs = ac->ac_o_ex.fe_logical % |
| 3688 | EXT4_C2B(sbi, ac->ac_b_ex.fe_len); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3689 | if (offs && offs < win) |
| 3690 | win = offs; |
| 3691 | |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3692 | ac->ac_b_ex.fe_logical = ac->ac_o_ex.fe_logical - |
Lukas Czerner | 810da24 | 2013-03-02 17:18:58 -0500 | [diff] [blame] | 3693 | EXT4_NUM_B2C(sbi, win); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3694 | BUG_ON(ac->ac_o_ex.fe_logical < ac->ac_b_ex.fe_logical); |
| 3695 | BUG_ON(ac->ac_o_ex.fe_len > ac->ac_b_ex.fe_len); |
| 3696 | } |
| 3697 | |
| 3698 | /* preallocation can change ac_b_ex, thus we store actually |
| 3699 | * allocated blocks for history */ |
| 3700 | ac->ac_f_ex = ac->ac_b_ex; |
| 3701 | |
| 3702 | pa->pa_lstart = ac->ac_b_ex.fe_logical; |
| 3703 | pa->pa_pstart = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); |
| 3704 | pa->pa_len = ac->ac_b_ex.fe_len; |
| 3705 | pa->pa_free = pa->pa_len; |
| 3706 | atomic_set(&pa->pa_count, 1); |
| 3707 | spin_lock_init(&pa->pa_lock); |
Aneesh Kumar K.V | d794bf8 | 2009-02-14 10:31:16 -0500 | [diff] [blame] | 3708 | INIT_LIST_HEAD(&pa->pa_inode_list); |
| 3709 | INIT_LIST_HEAD(&pa->pa_group_list); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3710 | pa->pa_deleted = 0; |
Aneesh Kumar K.V | cc0fb9a | 2009-03-27 17:16:58 -0400 | [diff] [blame] | 3711 | pa->pa_type = MB_INODE_PA; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3712 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 3713 | mb_debug(1, "new inode pa %p: %llu/%u for %u\n", pa, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3714 | pa->pa_pstart, pa->pa_len, pa->pa_lstart); |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 3715 | trace_ext4_mb_new_inode_pa(ac, pa); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3716 | |
| 3717 | ext4_mb_use_inode_pa(ac, pa); |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3718 | atomic_add(pa->pa_free, &sbi->s_mb_preallocated); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3719 | |
| 3720 | ei = EXT4_I(ac->ac_inode); |
| 3721 | grp = ext4_get_group_info(sb, ac->ac_b_ex.fe_group); |
| 3722 | |
| 3723 | pa->pa_obj_lock = &ei->i_prealloc_lock; |
| 3724 | pa->pa_inode = ac->ac_inode; |
| 3725 | |
| 3726 | ext4_lock_group(sb, ac->ac_b_ex.fe_group); |
| 3727 | list_add(&pa->pa_group_list, &grp->bb_prealloc_list); |
| 3728 | ext4_unlock_group(sb, ac->ac_b_ex.fe_group); |
| 3729 | |
| 3730 | spin_lock(pa->pa_obj_lock); |
| 3731 | list_add_rcu(&pa->pa_inode_list, &ei->i_prealloc_list); |
| 3732 | spin_unlock(pa->pa_obj_lock); |
| 3733 | |
| 3734 | return 0; |
| 3735 | } |
| 3736 | |
| 3737 | /* |
| 3738 | * creates new preallocated space for locality group inodes belongs to |
| 3739 | */ |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3740 | static noinline_for_stack int |
| 3741 | ext4_mb_new_group_pa(struct ext4_allocation_context *ac) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3742 | { |
| 3743 | struct super_block *sb = ac->ac_sb; |
| 3744 | struct ext4_locality_group *lg; |
| 3745 | struct ext4_prealloc_space *pa; |
| 3746 | struct ext4_group_info *grp; |
| 3747 | |
| 3748 | /* preallocate only when found space is larger then requested */ |
| 3749 | BUG_ON(ac->ac_o_ex.fe_len >= ac->ac_b_ex.fe_len); |
| 3750 | BUG_ON(ac->ac_status != AC_STATUS_FOUND); |
| 3751 | BUG_ON(!S_ISREG(ac->ac_inode->i_mode)); |
| 3752 | |
| 3753 | BUG_ON(ext4_pspace_cachep == NULL); |
| 3754 | pa = kmem_cache_alloc(ext4_pspace_cachep, GFP_NOFS); |
| 3755 | if (pa == NULL) |
| 3756 | return -ENOMEM; |
| 3757 | |
| 3758 | /* preallocation can change ac_b_ex, thus we store actually |
| 3759 | * allocated blocks for history */ |
| 3760 | ac->ac_f_ex = ac->ac_b_ex; |
| 3761 | |
| 3762 | pa->pa_pstart = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); |
| 3763 | pa->pa_lstart = pa->pa_pstart; |
| 3764 | pa->pa_len = ac->ac_b_ex.fe_len; |
| 3765 | pa->pa_free = pa->pa_len; |
| 3766 | atomic_set(&pa->pa_count, 1); |
| 3767 | spin_lock_init(&pa->pa_lock); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 3768 | INIT_LIST_HEAD(&pa->pa_inode_list); |
Aneesh Kumar K.V | d794bf8 | 2009-02-14 10:31:16 -0500 | [diff] [blame] | 3769 | INIT_LIST_HEAD(&pa->pa_group_list); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3770 | pa->pa_deleted = 0; |
Aneesh Kumar K.V | cc0fb9a | 2009-03-27 17:16:58 -0400 | [diff] [blame] | 3771 | pa->pa_type = MB_GROUP_PA; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3772 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 3773 | mb_debug(1, "new group pa %p: %llu/%u for %u\n", pa, |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 3774 | pa->pa_pstart, pa->pa_len, pa->pa_lstart); |
| 3775 | trace_ext4_mb_new_group_pa(ac, pa); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3776 | |
| 3777 | ext4_mb_use_group_pa(ac, pa); |
| 3778 | atomic_add(pa->pa_free, &EXT4_SB(sb)->s_mb_preallocated); |
| 3779 | |
| 3780 | grp = ext4_get_group_info(sb, ac->ac_b_ex.fe_group); |
| 3781 | lg = ac->ac_lg; |
| 3782 | BUG_ON(lg == NULL); |
| 3783 | |
| 3784 | pa->pa_obj_lock = &lg->lg_prealloc_lock; |
| 3785 | pa->pa_inode = NULL; |
| 3786 | |
| 3787 | ext4_lock_group(sb, ac->ac_b_ex.fe_group); |
| 3788 | list_add(&pa->pa_group_list, &grp->bb_prealloc_list); |
| 3789 | ext4_unlock_group(sb, ac->ac_b_ex.fe_group); |
| 3790 | |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 3791 | /* |
| 3792 | * We will later add the new pa to the right bucket |
| 3793 | * after updating the pa_free in ext4_mb_release_context |
| 3794 | */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3795 | return 0; |
| 3796 | } |
| 3797 | |
| 3798 | static int ext4_mb_new_preallocation(struct ext4_allocation_context *ac) |
| 3799 | { |
| 3800 | int err; |
| 3801 | |
| 3802 | if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) |
| 3803 | err = ext4_mb_new_group_pa(ac); |
| 3804 | else |
| 3805 | err = ext4_mb_new_inode_pa(ac); |
| 3806 | return err; |
| 3807 | } |
| 3808 | |
| 3809 | /* |
| 3810 | * finds all unused blocks in on-disk bitmap, frees them in |
| 3811 | * in-core bitmap and buddy. |
| 3812 | * @pa must be unlinked from inode and group lists, so that |
| 3813 | * nobody else can find/use it. |
| 3814 | * the caller MUST hold group/inode locks. |
| 3815 | * TODO: optimize the case when there are no in-core structures yet |
| 3816 | */ |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3817 | static noinline_for_stack int |
| 3818 | ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh, |
Eric Sandeen | 3e1e5f5 | 2010-10-27 21:30:07 -0400 | [diff] [blame] | 3819 | struct ext4_prealloc_space *pa) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3820 | { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3821 | struct super_block *sb = e4b->bd_sb; |
| 3822 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 3823 | unsigned int end; |
| 3824 | unsigned int next; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3825 | ext4_group_t group; |
| 3826 | ext4_grpblk_t bit; |
Theodore Ts'o | ba80b10 | 2009-01-03 20:03:21 -0500 | [diff] [blame] | 3827 | unsigned long long grp_blk_start; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3828 | int err = 0; |
| 3829 | int free = 0; |
| 3830 | |
| 3831 | BUG_ON(pa->pa_deleted == 0); |
| 3832 | ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit); |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3833 | grp_blk_start = pa->pa_pstart - EXT4_C2B(sbi, bit); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3834 | BUG_ON(group != e4b->bd_group && pa->pa_len != 0); |
| 3835 | end = bit + pa->pa_len; |
| 3836 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3837 | while (bit < end) { |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 3838 | bit = mb_find_next_zero_bit(bitmap_bh->b_data, end, bit); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3839 | if (bit >= end) |
| 3840 | break; |
Aneesh Kumar K.V | ffad0a4 | 2008-02-23 01:38:34 -0500 | [diff] [blame] | 3841 | next = mb_find_next_bit(bitmap_bh->b_data, end, bit); |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 3842 | mb_debug(1, " free preallocated %u/%u in group %u\n", |
Andi Kleen | 5a0790c | 2010-06-14 13:28:03 -0400 | [diff] [blame] | 3843 | (unsigned) ext4_group_first_block_no(sb, group) + bit, |
| 3844 | (unsigned) next - bit, (unsigned) group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3845 | free += next - bit; |
| 3846 | |
Eric Sandeen | 3e1e5f5 | 2010-10-27 21:30:07 -0400 | [diff] [blame] | 3847 | trace_ext4_mballoc_discard(sb, NULL, group, bit, next - bit); |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 3848 | trace_ext4_mb_release_inode_pa(pa, (grp_blk_start + |
| 3849 | EXT4_C2B(sbi, bit)), |
Lukas Czerner | a9c667f | 2011-06-06 09:51:52 -0400 | [diff] [blame] | 3850 | next - bit); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3851 | mb_free_blocks(pa->pa_inode, e4b, bit, next - bit); |
| 3852 | bit = next + 1; |
| 3853 | } |
| 3854 | if (free != pa->pa_free) { |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 3855 | ext4_msg(e4b->bd_sb, KERN_CRIT, |
| 3856 | "pa %p: logic %lu, phys. %lu, len %lu", |
| 3857 | pa, (unsigned long) pa->pa_lstart, |
| 3858 | (unsigned long) pa->pa_pstart, |
| 3859 | (unsigned long) pa->pa_len); |
Theodore Ts'o | e29136f | 2010-06-29 12:54:28 -0400 | [diff] [blame] | 3860 | ext4_grp_locked_error(sb, group, 0, 0, "free %u, pa_free %u", |
Aneesh Kumar K.V | 5d1b1b3 | 2009-01-05 22:19:52 -0500 | [diff] [blame] | 3861 | free, pa->pa_free); |
Aneesh Kumar K.V | e56eb65 | 2008-02-15 13:48:21 -0500 | [diff] [blame] | 3862 | /* |
| 3863 | * pa is already deleted so we use the value obtained |
| 3864 | * from the bitmap and continue. |
| 3865 | */ |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3866 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3867 | atomic_add(free, &sbi->s_mb_discarded); |
| 3868 | |
| 3869 | return err; |
| 3870 | } |
| 3871 | |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3872 | static noinline_for_stack int |
| 3873 | ext4_mb_release_group_pa(struct ext4_buddy *e4b, |
Eric Sandeen | 3e1e5f5 | 2010-10-27 21:30:07 -0400 | [diff] [blame] | 3874 | struct ext4_prealloc_space *pa) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3875 | { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3876 | struct super_block *sb = e4b->bd_sb; |
| 3877 | ext4_group_t group; |
| 3878 | ext4_grpblk_t bit; |
| 3879 | |
Yongqiang Yang | 60e07cf | 2011-12-18 15:49:54 -0500 | [diff] [blame] | 3880 | trace_ext4_mb_release_group_pa(sb, pa); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3881 | BUG_ON(pa->pa_deleted == 0); |
| 3882 | ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit); |
| 3883 | BUG_ON(group != e4b->bd_group && pa->pa_len != 0); |
| 3884 | mb_free_blocks(pa->pa_inode, e4b, bit, pa->pa_len); |
| 3885 | atomic_add(pa->pa_len, &EXT4_SB(sb)->s_mb_discarded); |
Eric Sandeen | 3e1e5f5 | 2010-10-27 21:30:07 -0400 | [diff] [blame] | 3886 | trace_ext4_mballoc_discard(sb, NULL, group, bit, pa->pa_len); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3887 | |
| 3888 | return 0; |
| 3889 | } |
| 3890 | |
| 3891 | /* |
| 3892 | * releases all preallocations in given group |
| 3893 | * |
| 3894 | * first, we need to decide discard policy: |
| 3895 | * - when do we discard |
| 3896 | * 1) ENOSPC |
| 3897 | * - how many do we discard |
| 3898 | * 1) how many requested |
| 3899 | */ |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 3900 | static noinline_for_stack int |
| 3901 | ext4_mb_discard_group_preallocations(struct super_block *sb, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3902 | ext4_group_t group, int needed) |
| 3903 | { |
| 3904 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); |
| 3905 | struct buffer_head *bitmap_bh = NULL; |
| 3906 | struct ext4_prealloc_space *pa, *tmp; |
| 3907 | struct list_head list; |
| 3908 | struct ext4_buddy e4b; |
| 3909 | int err; |
| 3910 | int busy = 0; |
| 3911 | int free = 0; |
| 3912 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 3913 | mb_debug(1, "discard preallocation for group %u\n", group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3914 | |
| 3915 | if (list_empty(&grp->bb_prealloc_list)) |
| 3916 | return 0; |
| 3917 | |
Theodore Ts'o | 574ca17 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 3918 | bitmap_bh = ext4_read_block_bitmap(sb, group); |
Darrick J. Wong | 9008a58 | 2015-10-17 21:33:24 -0400 | [diff] [blame] | 3919 | if (IS_ERR(bitmap_bh)) { |
| 3920 | err = PTR_ERR(bitmap_bh); |
| 3921 | ext4_error(sb, "Error %d reading block bitmap for %u", |
| 3922 | err, group); |
Aneesh Kumar K.V | ce89f46 | 2008-07-23 14:09:29 -0400 | [diff] [blame] | 3923 | return 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3924 | } |
| 3925 | |
| 3926 | err = ext4_mb_load_buddy(sb, group, &e4b); |
Aneesh Kumar K.V | ce89f46 | 2008-07-23 14:09:29 -0400 | [diff] [blame] | 3927 | if (err) { |
Konstantin Khlebnikov | 9651e6b | 2017-05-21 22:35:23 -0400 | [diff] [blame] | 3928 | ext4_warning(sb, "Error %d loading buddy information for %u", |
| 3929 | err, group); |
Aneesh Kumar K.V | ce89f46 | 2008-07-23 14:09:29 -0400 | [diff] [blame] | 3930 | put_bh(bitmap_bh); |
| 3931 | return 0; |
| 3932 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3933 | |
| 3934 | if (needed == 0) |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 3935 | needed = EXT4_CLUSTERS_PER_GROUP(sb) + 1; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3936 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3937 | INIT_LIST_HEAD(&list); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3938 | repeat: |
| 3939 | ext4_lock_group(sb, group); |
| 3940 | list_for_each_entry_safe(pa, tmp, |
| 3941 | &grp->bb_prealloc_list, pa_group_list) { |
| 3942 | spin_lock(&pa->pa_lock); |
| 3943 | if (atomic_read(&pa->pa_count)) { |
| 3944 | spin_unlock(&pa->pa_lock); |
| 3945 | busy = 1; |
| 3946 | continue; |
| 3947 | } |
| 3948 | if (pa->pa_deleted) { |
| 3949 | spin_unlock(&pa->pa_lock); |
| 3950 | continue; |
| 3951 | } |
| 3952 | |
| 3953 | /* seems this one can be freed ... */ |
| 3954 | pa->pa_deleted = 1; |
| 3955 | |
| 3956 | /* we can trust pa_free ... */ |
| 3957 | free += pa->pa_free; |
| 3958 | |
| 3959 | spin_unlock(&pa->pa_lock); |
| 3960 | |
| 3961 | list_del(&pa->pa_group_list); |
| 3962 | list_add(&pa->u.pa_tmp_list, &list); |
| 3963 | } |
| 3964 | |
| 3965 | /* if we still need more blocks and some PAs were used, try again */ |
| 3966 | if (free < needed && busy) { |
| 3967 | busy = 0; |
| 3968 | ext4_unlock_group(sb, group); |
Lukas Czerner | bb8b20e | 2013-03-10 22:28:09 -0400 | [diff] [blame] | 3969 | cond_resched(); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3970 | goto repeat; |
| 3971 | } |
| 3972 | |
| 3973 | /* found anything to free? */ |
| 3974 | if (list_empty(&list)) { |
| 3975 | BUG_ON(free != 0); |
| 3976 | goto out; |
| 3977 | } |
| 3978 | |
| 3979 | /* now free all selected PAs */ |
| 3980 | list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) { |
| 3981 | |
| 3982 | /* remove from object (inode or locality group) */ |
| 3983 | spin_lock(pa->pa_obj_lock); |
| 3984 | list_del_rcu(&pa->pa_inode_list); |
| 3985 | spin_unlock(pa->pa_obj_lock); |
| 3986 | |
Aneesh Kumar K.V | cc0fb9a | 2009-03-27 17:16:58 -0400 | [diff] [blame] | 3987 | if (pa->pa_type == MB_GROUP_PA) |
Eric Sandeen | 3e1e5f5 | 2010-10-27 21:30:07 -0400 | [diff] [blame] | 3988 | ext4_mb_release_group_pa(&e4b, pa); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3989 | else |
Eric Sandeen | 3e1e5f5 | 2010-10-27 21:30:07 -0400 | [diff] [blame] | 3990 | ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3991 | |
| 3992 | list_del(&pa->u.pa_tmp_list); |
| 3993 | call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); |
| 3994 | } |
| 3995 | |
| 3996 | out: |
| 3997 | ext4_unlock_group(sb, group); |
Jing Zhang | e39e07f | 2010-05-14 00:00:00 -0400 | [diff] [blame] | 3998 | ext4_mb_unload_buddy(&e4b); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 3999 | put_bh(bitmap_bh); |
| 4000 | return free; |
| 4001 | } |
| 4002 | |
| 4003 | /* |
| 4004 | * releases all non-used preallocated blocks for given inode |
| 4005 | * |
| 4006 | * It's important to discard preallocations under i_data_sem |
| 4007 | * We don't want another block to be served from the prealloc |
| 4008 | * space when we are discarding the inode prealloc space. |
| 4009 | * |
| 4010 | * FIXME!! Make sure it is valid at all the call sites |
| 4011 | */ |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 4012 | void ext4_discard_preallocations(struct inode *inode) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4013 | { |
| 4014 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 4015 | struct super_block *sb = inode->i_sb; |
| 4016 | struct buffer_head *bitmap_bh = NULL; |
| 4017 | struct ext4_prealloc_space *pa, *tmp; |
| 4018 | ext4_group_t group = 0; |
| 4019 | struct list_head list; |
| 4020 | struct ext4_buddy e4b; |
| 4021 | int err; |
| 4022 | |
Theodore Ts'o | c2ea3fd | 2008-10-10 09:40:52 -0400 | [diff] [blame] | 4023 | if (!S_ISREG(inode->i_mode)) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4024 | /*BUG_ON(!list_empty(&ei->i_prealloc_list));*/ |
| 4025 | return; |
| 4026 | } |
| 4027 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 4028 | mb_debug(1, "discard preallocation for inode %lu\n", inode->i_ino); |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 4029 | trace_ext4_discard_preallocations(inode); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4030 | |
| 4031 | INIT_LIST_HEAD(&list); |
| 4032 | |
| 4033 | repeat: |
| 4034 | /* first, collect all pa's in the inode */ |
| 4035 | spin_lock(&ei->i_prealloc_lock); |
| 4036 | while (!list_empty(&ei->i_prealloc_list)) { |
| 4037 | pa = list_entry(ei->i_prealloc_list.next, |
| 4038 | struct ext4_prealloc_space, pa_inode_list); |
| 4039 | BUG_ON(pa->pa_obj_lock != &ei->i_prealloc_lock); |
| 4040 | spin_lock(&pa->pa_lock); |
| 4041 | if (atomic_read(&pa->pa_count)) { |
| 4042 | /* this shouldn't happen often - nobody should |
| 4043 | * use preallocation while we're discarding it */ |
| 4044 | spin_unlock(&pa->pa_lock); |
| 4045 | spin_unlock(&ei->i_prealloc_lock); |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 4046 | ext4_msg(sb, KERN_ERR, |
| 4047 | "uh-oh! used pa while discarding"); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4048 | WARN_ON(1); |
| 4049 | schedule_timeout_uninterruptible(HZ); |
| 4050 | goto repeat; |
| 4051 | |
| 4052 | } |
| 4053 | if (pa->pa_deleted == 0) { |
| 4054 | pa->pa_deleted = 1; |
| 4055 | spin_unlock(&pa->pa_lock); |
| 4056 | list_del_rcu(&pa->pa_inode_list); |
| 4057 | list_add(&pa->u.pa_tmp_list, &list); |
| 4058 | continue; |
| 4059 | } |
| 4060 | |
| 4061 | /* someone is deleting pa right now */ |
| 4062 | spin_unlock(&pa->pa_lock); |
| 4063 | spin_unlock(&ei->i_prealloc_lock); |
| 4064 | |
| 4065 | /* we have to wait here because pa_deleted |
| 4066 | * doesn't mean pa is already unlinked from |
| 4067 | * the list. as we might be called from |
| 4068 | * ->clear_inode() the inode will get freed |
| 4069 | * and concurrent thread which is unlinking |
| 4070 | * pa from inode's list may access already |
| 4071 | * freed memory, bad-bad-bad */ |
| 4072 | |
| 4073 | /* XXX: if this happens too often, we can |
| 4074 | * add a flag to force wait only in case |
| 4075 | * of ->clear_inode(), but not in case of |
| 4076 | * regular truncate */ |
| 4077 | schedule_timeout_uninterruptible(HZ); |
| 4078 | goto repeat; |
| 4079 | } |
| 4080 | spin_unlock(&ei->i_prealloc_lock); |
| 4081 | |
| 4082 | list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) { |
Aneesh Kumar K.V | cc0fb9a | 2009-03-27 17:16:58 -0400 | [diff] [blame] | 4083 | BUG_ON(pa->pa_type != MB_INODE_PA); |
Lukas Czerner | bd86298 | 2013-04-03 23:32:34 -0400 | [diff] [blame] | 4084 | group = ext4_get_group_number(sb, pa->pa_pstart); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4085 | |
Konstantin Khlebnikov | 9651e6b | 2017-05-21 22:35:23 -0400 | [diff] [blame] | 4086 | err = ext4_mb_load_buddy_gfp(sb, group, &e4b, |
| 4087 | GFP_NOFS|__GFP_NOFAIL); |
Aneesh Kumar K.V | ce89f46 | 2008-07-23 14:09:29 -0400 | [diff] [blame] | 4088 | if (err) { |
Konstantin Khlebnikov | 9651e6b | 2017-05-21 22:35:23 -0400 | [diff] [blame] | 4089 | ext4_error(sb, "Error %d loading buddy information for %u", |
| 4090 | err, group); |
Aneesh Kumar K.V | ce89f46 | 2008-07-23 14:09:29 -0400 | [diff] [blame] | 4091 | continue; |
| 4092 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4093 | |
Theodore Ts'o | 574ca17 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 4094 | bitmap_bh = ext4_read_block_bitmap(sb, group); |
Darrick J. Wong | 9008a58 | 2015-10-17 21:33:24 -0400 | [diff] [blame] | 4095 | if (IS_ERR(bitmap_bh)) { |
| 4096 | err = PTR_ERR(bitmap_bh); |
| 4097 | ext4_error(sb, "Error %d reading block bitmap for %u", |
| 4098 | err, group); |
Jing Zhang | e39e07f | 2010-05-14 00:00:00 -0400 | [diff] [blame] | 4099 | ext4_mb_unload_buddy(&e4b); |
Aneesh Kumar K.V | ce89f46 | 2008-07-23 14:09:29 -0400 | [diff] [blame] | 4100 | continue; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4101 | } |
| 4102 | |
| 4103 | ext4_lock_group(sb, group); |
| 4104 | list_del(&pa->pa_group_list); |
Eric Sandeen | 3e1e5f5 | 2010-10-27 21:30:07 -0400 | [diff] [blame] | 4105 | ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4106 | ext4_unlock_group(sb, group); |
| 4107 | |
Jing Zhang | e39e07f | 2010-05-14 00:00:00 -0400 | [diff] [blame] | 4108 | ext4_mb_unload_buddy(&e4b); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4109 | put_bh(bitmap_bh); |
| 4110 | |
| 4111 | list_del(&pa->u.pa_tmp_list); |
| 4112 | call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); |
| 4113 | } |
| 4114 | } |
| 4115 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 4116 | #ifdef CONFIG_EXT4_DEBUG |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4117 | static void ext4_mb_show_ac(struct ext4_allocation_context *ac) |
| 4118 | { |
| 4119 | struct super_block *sb = ac->ac_sb; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 4120 | ext4_group_t ngroups, i; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4121 | |
Theodore Ts'o | a0b30c1 | 2013-02-09 16:28:20 -0500 | [diff] [blame] | 4122 | if (!ext4_mballoc_debug || |
Theodore Ts'o | 4dd89fc | 2011-02-27 17:23:47 -0500 | [diff] [blame] | 4123 | (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)) |
Eric Sandeen | e357063 | 2010-07-27 11:56:08 -0400 | [diff] [blame] | 4124 | return; |
| 4125 | |
Joe Perches | 7f6a11e | 2012-03-19 23:09:43 -0400 | [diff] [blame] | 4126 | ext4_msg(ac->ac_sb, KERN_ERR, "Can't allocate:" |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 4127 | " Allocation context details:"); |
Joe Perches | 7f6a11e | 2012-03-19 23:09:43 -0400 | [diff] [blame] | 4128 | ext4_msg(ac->ac_sb, KERN_ERR, "status %d flags %d", |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4129 | ac->ac_status, ac->ac_flags); |
Joe Perches | 7f6a11e | 2012-03-19 23:09:43 -0400 | [diff] [blame] | 4130 | ext4_msg(ac->ac_sb, KERN_ERR, "orig %lu/%lu/%lu@%lu, " |
Theodore Ts'o | 9d8b9ec | 2011-08-01 17:41:35 -0400 | [diff] [blame] | 4131 | "goal %lu/%lu/%lu@%lu, " |
| 4132 | "best %lu/%lu/%lu@%lu cr %d", |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4133 | (unsigned long)ac->ac_o_ex.fe_group, |
| 4134 | (unsigned long)ac->ac_o_ex.fe_start, |
| 4135 | (unsigned long)ac->ac_o_ex.fe_len, |
| 4136 | (unsigned long)ac->ac_o_ex.fe_logical, |
| 4137 | (unsigned long)ac->ac_g_ex.fe_group, |
| 4138 | (unsigned long)ac->ac_g_ex.fe_start, |
| 4139 | (unsigned long)ac->ac_g_ex.fe_len, |
| 4140 | (unsigned long)ac->ac_g_ex.fe_logical, |
| 4141 | (unsigned long)ac->ac_b_ex.fe_group, |
| 4142 | (unsigned long)ac->ac_b_ex.fe_start, |
| 4143 | (unsigned long)ac->ac_b_ex.fe_len, |
| 4144 | (unsigned long)ac->ac_b_ex.fe_logical, |
| 4145 | (int)ac->ac_criteria); |
Eric Sandeen | dc9ddd9 | 2014-02-20 13:32:10 -0500 | [diff] [blame] | 4146 | ext4_msg(ac->ac_sb, KERN_ERR, "%d found", ac->ac_found); |
Joe Perches | 7f6a11e | 2012-03-19 23:09:43 -0400 | [diff] [blame] | 4147 | ext4_msg(ac->ac_sb, KERN_ERR, "groups: "); |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 4148 | ngroups = ext4_get_groups_count(sb); |
| 4149 | for (i = 0; i < ngroups; i++) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4150 | struct ext4_group_info *grp = ext4_get_group_info(sb, i); |
| 4151 | struct ext4_prealloc_space *pa; |
| 4152 | ext4_grpblk_t start; |
| 4153 | struct list_head *cur; |
| 4154 | ext4_lock_group(sb, i); |
| 4155 | list_for_each(cur, &grp->bb_prealloc_list) { |
| 4156 | pa = list_entry(cur, struct ext4_prealloc_space, |
| 4157 | pa_group_list); |
| 4158 | spin_lock(&pa->pa_lock); |
| 4159 | ext4_get_group_no_and_offset(sb, pa->pa_pstart, |
| 4160 | NULL, &start); |
| 4161 | spin_unlock(&pa->pa_lock); |
Akira Fujita | 1c71850 | 2009-07-05 23:04:36 -0400 | [diff] [blame] | 4162 | printk(KERN_ERR "PA:%u:%d:%u \n", i, |
| 4163 | start, pa->pa_len); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4164 | } |
Solofo Ramangalahy | 60bd63d | 2008-04-29 21:59:59 -0400 | [diff] [blame] | 4165 | ext4_unlock_group(sb, i); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4166 | |
| 4167 | if (grp->bb_free == 0) |
| 4168 | continue; |
Akira Fujita | 1c71850 | 2009-07-05 23:04:36 -0400 | [diff] [blame] | 4169 | printk(KERN_ERR "%u: %d/%d \n", |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4170 | i, grp->bb_free, grp->bb_fragments); |
| 4171 | } |
| 4172 | printk(KERN_ERR "\n"); |
| 4173 | } |
| 4174 | #else |
| 4175 | static inline void ext4_mb_show_ac(struct ext4_allocation_context *ac) |
| 4176 | { |
| 4177 | return; |
| 4178 | } |
| 4179 | #endif |
| 4180 | |
| 4181 | /* |
| 4182 | * We use locality group preallocation for small size file. The size of the |
| 4183 | * file is determined by the current size or the resulting size after |
| 4184 | * allocation which ever is larger |
| 4185 | * |
Theodore Ts'o | b713a5e | 2009-03-31 09:11:14 -0400 | [diff] [blame] | 4186 | * One can tune this size via /sys/fs/ext4/<partition>/mb_stream_req |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4187 | */ |
| 4188 | static void ext4_mb_group_or_file(struct ext4_allocation_context *ac) |
| 4189 | { |
| 4190 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
| 4191 | int bsbits = ac->ac_sb->s_blocksize_bits; |
| 4192 | loff_t size, isize; |
| 4193 | |
| 4194 | if (!(ac->ac_flags & EXT4_MB_HINT_DATA)) |
| 4195 | return; |
| 4196 | |
Theodore Ts'o | 4ba74d0 | 2009-08-09 22:01:13 -0400 | [diff] [blame] | 4197 | if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY)) |
| 4198 | return; |
| 4199 | |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4200 | size = ac->ac_o_ex.fe_logical + EXT4_C2B(sbi, ac->ac_o_ex.fe_len); |
Theodore Ts'o | 5079748 | 2009-09-18 13:34:02 -0400 | [diff] [blame] | 4201 | isize = (i_size_read(ac->ac_inode) + ac->ac_sb->s_blocksize - 1) |
| 4202 | >> bsbits; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4203 | |
Theodore Ts'o | 5079748 | 2009-09-18 13:34:02 -0400 | [diff] [blame] | 4204 | if ((size == isize) && |
| 4205 | !ext4_fs_is_busy(sbi) && |
| 4206 | (atomic_read(&ac->ac_inode->i_writecount) == 0)) { |
| 4207 | ac->ac_flags |= EXT4_MB_HINT_NOPREALLOC; |
| 4208 | return; |
| 4209 | } |
| 4210 | |
Robin Dong | ebbe027 | 2011-10-26 05:14:27 -0400 | [diff] [blame] | 4211 | if (sbi->s_mb_group_prealloc <= 0) { |
| 4212 | ac->ac_flags |= EXT4_MB_STREAM_ALLOC; |
| 4213 | return; |
| 4214 | } |
| 4215 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4216 | /* don't use group allocation for large files */ |
Theodore Ts'o | 7178057 | 2009-09-28 00:06:20 -0400 | [diff] [blame] | 4217 | size = max(size, isize); |
Tao Ma | cc483f1 | 2010-03-01 19:06:35 -0500 | [diff] [blame] | 4218 | if (size > sbi->s_mb_stream_request) { |
Theodore Ts'o | 4ba74d0 | 2009-08-09 22:01:13 -0400 | [diff] [blame] | 4219 | ac->ac_flags |= EXT4_MB_STREAM_ALLOC; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4220 | return; |
Theodore Ts'o | 4ba74d0 | 2009-08-09 22:01:13 -0400 | [diff] [blame] | 4221 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4222 | |
| 4223 | BUG_ON(ac->ac_lg != NULL); |
| 4224 | /* |
| 4225 | * locality group prealloc space are per cpu. The reason for having |
| 4226 | * per cpu locality group is to reduce the contention between block |
| 4227 | * request from multiple CPUs. |
| 4228 | */ |
Christoph Lameter | a0b6bc6 | 2014-08-17 12:30:28 -0500 | [diff] [blame] | 4229 | ac->ac_lg = raw_cpu_ptr(sbi->s_locality_groups); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4230 | |
| 4231 | /* we're going to use group allocation */ |
| 4232 | ac->ac_flags |= EXT4_MB_HINT_GROUP_ALLOC; |
| 4233 | |
| 4234 | /* serialize all allocations in the group */ |
| 4235 | mutex_lock(&ac->ac_lg->lg_mutex); |
| 4236 | } |
| 4237 | |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 4238 | static noinline_for_stack int |
| 4239 | ext4_mb_initialize_context(struct ext4_allocation_context *ac, |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4240 | struct ext4_allocation_request *ar) |
| 4241 | { |
| 4242 | struct super_block *sb = ar->inode->i_sb; |
| 4243 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 4244 | struct ext4_super_block *es = sbi->s_es; |
| 4245 | ext4_group_t group; |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 4246 | unsigned int len; |
| 4247 | ext4_fsblk_t goal; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4248 | ext4_grpblk_t block; |
| 4249 | |
| 4250 | /* we can't allocate > group size */ |
| 4251 | len = ar->len; |
| 4252 | |
| 4253 | /* just a dirty hack to filter too big requests */ |
Theodore Ts'o | 40ae348 | 2013-02-04 15:08:40 -0500 | [diff] [blame] | 4254 | if (len >= EXT4_CLUSTERS_PER_GROUP(sb)) |
| 4255 | len = EXT4_CLUSTERS_PER_GROUP(sb); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4256 | |
| 4257 | /* start searching from the goal */ |
| 4258 | goal = ar->goal; |
| 4259 | if (goal < le32_to_cpu(es->s_first_data_block) || |
| 4260 | goal >= ext4_blocks_count(es)) |
| 4261 | goal = le32_to_cpu(es->s_first_data_block); |
| 4262 | ext4_get_group_no_and_offset(sb, goal, &group, &block); |
| 4263 | |
| 4264 | /* set up allocation goals */ |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 4265 | ac->ac_b_ex.fe_logical = EXT4_LBLK_CMASK(sbi, ar->logical); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4266 | ac->ac_status = AC_STATUS_CONTINUE; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4267 | ac->ac_sb = sb; |
| 4268 | ac->ac_inode = ar->inode; |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4269 | ac->ac_o_ex.fe_logical = ac->ac_b_ex.fe_logical; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4270 | ac->ac_o_ex.fe_group = group; |
| 4271 | ac->ac_o_ex.fe_start = block; |
| 4272 | ac->ac_o_ex.fe_len = len; |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4273 | ac->ac_g_ex = ac->ac_o_ex; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4274 | ac->ac_flags = ar->flags; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4275 | |
| 4276 | /* we have to define context: we'll we work with a file or |
| 4277 | * locality group. this is a policy, actually */ |
| 4278 | ext4_mb_group_or_file(ac); |
| 4279 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 4280 | mb_debug(1, "init ac: %u blocks @ %u, goal %u, flags %x, 2^%d, " |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4281 | "left: %u/%u, right %u/%u to %swritable\n", |
| 4282 | (unsigned) ar->len, (unsigned) ar->logical, |
| 4283 | (unsigned) ar->goal, ac->ac_flags, ac->ac_2order, |
| 4284 | (unsigned) ar->lleft, (unsigned) ar->pleft, |
| 4285 | (unsigned) ar->lright, (unsigned) ar->pright, |
| 4286 | atomic_read(&ar->inode->i_writecount) ? "" : "non-"); |
| 4287 | return 0; |
| 4288 | |
| 4289 | } |
| 4290 | |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4291 | static noinline_for_stack void |
| 4292 | ext4_mb_discard_lg_preallocations(struct super_block *sb, |
| 4293 | struct ext4_locality_group *lg, |
| 4294 | int order, int total_entries) |
| 4295 | { |
| 4296 | ext4_group_t group = 0; |
| 4297 | struct ext4_buddy e4b; |
| 4298 | struct list_head discard_list; |
| 4299 | struct ext4_prealloc_space *pa, *tmp; |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4300 | |
Theodore Ts'o | 6ba495e | 2009-09-18 13:38:55 -0400 | [diff] [blame] | 4301 | mb_debug(1, "discard locality group preallocation\n"); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4302 | |
| 4303 | INIT_LIST_HEAD(&discard_list); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4304 | |
| 4305 | spin_lock(&lg->lg_prealloc_lock); |
| 4306 | list_for_each_entry_rcu(pa, &lg->lg_prealloc_list[order], |
| 4307 | pa_inode_list) { |
| 4308 | spin_lock(&pa->pa_lock); |
| 4309 | if (atomic_read(&pa->pa_count)) { |
| 4310 | /* |
| 4311 | * This is the pa that we just used |
| 4312 | * for block allocation. So don't |
| 4313 | * free that |
| 4314 | */ |
| 4315 | spin_unlock(&pa->pa_lock); |
| 4316 | continue; |
| 4317 | } |
| 4318 | if (pa->pa_deleted) { |
| 4319 | spin_unlock(&pa->pa_lock); |
| 4320 | continue; |
| 4321 | } |
| 4322 | /* only lg prealloc space */ |
Aneesh Kumar K.V | cc0fb9a | 2009-03-27 17:16:58 -0400 | [diff] [blame] | 4323 | BUG_ON(pa->pa_type != MB_GROUP_PA); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4324 | |
| 4325 | /* seems this one can be freed ... */ |
| 4326 | pa->pa_deleted = 1; |
| 4327 | spin_unlock(&pa->pa_lock); |
| 4328 | |
| 4329 | list_del_rcu(&pa->pa_inode_list); |
| 4330 | list_add(&pa->u.pa_tmp_list, &discard_list); |
| 4331 | |
| 4332 | total_entries--; |
| 4333 | if (total_entries <= 5) { |
| 4334 | /* |
| 4335 | * we want to keep only 5 entries |
| 4336 | * allowing it to grow to 8. This |
| 4337 | * mak sure we don't call discard |
| 4338 | * soon for this list. |
| 4339 | */ |
| 4340 | break; |
| 4341 | } |
| 4342 | } |
| 4343 | spin_unlock(&lg->lg_prealloc_lock); |
| 4344 | |
| 4345 | list_for_each_entry_safe(pa, tmp, &discard_list, u.pa_tmp_list) { |
Konstantin Khlebnikov | 9651e6b | 2017-05-21 22:35:23 -0400 | [diff] [blame] | 4346 | int err; |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4347 | |
Lukas Czerner | bd86298 | 2013-04-03 23:32:34 -0400 | [diff] [blame] | 4348 | group = ext4_get_group_number(sb, pa->pa_pstart); |
Konstantin Khlebnikov | 9651e6b | 2017-05-21 22:35:23 -0400 | [diff] [blame] | 4349 | err = ext4_mb_load_buddy_gfp(sb, group, &e4b, |
| 4350 | GFP_NOFS|__GFP_NOFAIL); |
| 4351 | if (err) { |
| 4352 | ext4_error(sb, "Error %d loading buddy information for %u", |
| 4353 | err, group); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4354 | continue; |
| 4355 | } |
| 4356 | ext4_lock_group(sb, group); |
| 4357 | list_del(&pa->pa_group_list); |
Eric Sandeen | 3e1e5f5 | 2010-10-27 21:30:07 -0400 | [diff] [blame] | 4358 | ext4_mb_release_group_pa(&e4b, pa); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4359 | ext4_unlock_group(sb, group); |
| 4360 | |
Jing Zhang | e39e07f | 2010-05-14 00:00:00 -0400 | [diff] [blame] | 4361 | ext4_mb_unload_buddy(&e4b); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4362 | list_del(&pa->u.pa_tmp_list); |
| 4363 | call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); |
| 4364 | } |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4365 | } |
| 4366 | |
| 4367 | /* |
| 4368 | * We have incremented pa_count. So it cannot be freed at this |
| 4369 | * point. Also we hold lg_mutex. So no parallel allocation is |
| 4370 | * possible from this lg. That means pa_free cannot be updated. |
| 4371 | * |
| 4372 | * A parallel ext4_mb_discard_group_preallocations is possible. |
| 4373 | * which can cause the lg_prealloc_list to be updated. |
| 4374 | */ |
| 4375 | |
| 4376 | static void ext4_mb_add_n_trim(struct ext4_allocation_context *ac) |
| 4377 | { |
| 4378 | int order, added = 0, lg_prealloc_count = 1; |
| 4379 | struct super_block *sb = ac->ac_sb; |
| 4380 | struct ext4_locality_group *lg = ac->ac_lg; |
| 4381 | struct ext4_prealloc_space *tmp_pa, *pa = ac->ac_pa; |
| 4382 | |
| 4383 | order = fls(pa->pa_free) - 1; |
| 4384 | if (order > PREALLOC_TB_SIZE - 1) |
| 4385 | /* The max size of hash table is PREALLOC_TB_SIZE */ |
| 4386 | order = PREALLOC_TB_SIZE - 1; |
| 4387 | /* Add the prealloc space to lg */ |
Niu Yawei | f116700 | 2013-02-01 21:31:27 -0500 | [diff] [blame] | 4388 | spin_lock(&lg->lg_prealloc_lock); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4389 | list_for_each_entry_rcu(tmp_pa, &lg->lg_prealloc_list[order], |
| 4390 | pa_inode_list) { |
| 4391 | spin_lock(&tmp_pa->pa_lock); |
| 4392 | if (tmp_pa->pa_deleted) { |
Theodore Ts'o | e7c9e3e | 2009-03-27 19:43:21 -0400 | [diff] [blame] | 4393 | spin_unlock(&tmp_pa->pa_lock); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4394 | continue; |
| 4395 | } |
| 4396 | if (!added && pa->pa_free < tmp_pa->pa_free) { |
| 4397 | /* Add to the tail of the previous entry */ |
| 4398 | list_add_tail_rcu(&pa->pa_inode_list, |
| 4399 | &tmp_pa->pa_inode_list); |
| 4400 | added = 1; |
| 4401 | /* |
| 4402 | * we want to count the total |
| 4403 | * number of entries in the list |
| 4404 | */ |
| 4405 | } |
| 4406 | spin_unlock(&tmp_pa->pa_lock); |
| 4407 | lg_prealloc_count++; |
| 4408 | } |
| 4409 | if (!added) |
| 4410 | list_add_tail_rcu(&pa->pa_inode_list, |
| 4411 | &lg->lg_prealloc_list[order]); |
Niu Yawei | f116700 | 2013-02-01 21:31:27 -0500 | [diff] [blame] | 4412 | spin_unlock(&lg->lg_prealloc_lock); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4413 | |
| 4414 | /* Now trim the list to be not more than 8 elements */ |
| 4415 | if (lg_prealloc_count > 8) { |
| 4416 | ext4_mb_discard_lg_preallocations(sb, lg, |
Niu Yawei | f116700 | 2013-02-01 21:31:27 -0500 | [diff] [blame] | 4417 | order, lg_prealloc_count); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4418 | return; |
| 4419 | } |
| 4420 | return ; |
| 4421 | } |
| 4422 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4423 | /* |
| 4424 | * release all resource we used in allocation |
| 4425 | */ |
| 4426 | static int ext4_mb_release_context(struct ext4_allocation_context *ac) |
| 4427 | { |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4428 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4429 | struct ext4_prealloc_space *pa = ac->ac_pa; |
| 4430 | if (pa) { |
Aneesh Kumar K.V | cc0fb9a | 2009-03-27 17:16:58 -0400 | [diff] [blame] | 4431 | if (pa->pa_type == MB_GROUP_PA) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4432 | /* see comment in ext4_mb_use_group_pa() */ |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4433 | spin_lock(&pa->pa_lock); |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4434 | pa->pa_pstart += EXT4_C2B(sbi, ac->ac_b_ex.fe_len); |
| 4435 | pa->pa_lstart += EXT4_C2B(sbi, ac->ac_b_ex.fe_len); |
Aneesh Kumar K.V | 6be2ded | 2008-07-23 14:14:05 -0400 | [diff] [blame] | 4436 | pa->pa_free -= ac->ac_b_ex.fe_len; |
| 4437 | pa->pa_len -= ac->ac_b_ex.fe_len; |
| 4438 | spin_unlock(&pa->pa_lock); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4439 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4440 | } |
Aneesh Kumar K.V | ba44391 | 2009-02-10 11:14:34 -0500 | [diff] [blame] | 4441 | if (pa) { |
| 4442 | /* |
| 4443 | * We want to add the pa to the right bucket. |
| 4444 | * Remove it from the list and while adding |
| 4445 | * make sure the list to which we are adding |
Amir Goldstein | 44183d4 | 2011-05-09 21:52:36 -0400 | [diff] [blame] | 4446 | * doesn't grow big. |
Aneesh Kumar K.V | ba44391 | 2009-02-10 11:14:34 -0500 | [diff] [blame] | 4447 | */ |
Aneesh Kumar K.V | cc0fb9a | 2009-03-27 17:16:58 -0400 | [diff] [blame] | 4448 | if ((pa->pa_type == MB_GROUP_PA) && likely(pa->pa_free)) { |
Aneesh Kumar K.V | ba44391 | 2009-02-10 11:14:34 -0500 | [diff] [blame] | 4449 | spin_lock(pa->pa_obj_lock); |
| 4450 | list_del_rcu(&pa->pa_inode_list); |
| 4451 | spin_unlock(pa->pa_obj_lock); |
| 4452 | ext4_mb_add_n_trim(ac); |
| 4453 | } |
| 4454 | ext4_mb_put_pa(ac, ac->ac_sb, pa); |
| 4455 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4456 | if (ac->ac_bitmap_page) |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 4457 | put_page(ac->ac_bitmap_page); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4458 | if (ac->ac_buddy_page) |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 4459 | put_page(ac->ac_buddy_page); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4460 | if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) |
| 4461 | mutex_unlock(&ac->ac_lg->lg_mutex); |
| 4462 | ext4_mb_collect_stats(ac); |
| 4463 | return 0; |
| 4464 | } |
| 4465 | |
| 4466 | static int ext4_mb_discard_preallocations(struct super_block *sb, int needed) |
| 4467 | { |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 4468 | ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4469 | int ret; |
| 4470 | int freed = 0; |
| 4471 | |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 4472 | trace_ext4_mb_discard_preallocations(sb, needed); |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 4473 | for (i = 0; i < ngroups && needed > 0; i++) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4474 | ret = ext4_mb_discard_group_preallocations(sb, i, needed); |
| 4475 | freed += ret; |
| 4476 | needed -= ret; |
| 4477 | } |
| 4478 | |
| 4479 | return freed; |
| 4480 | } |
| 4481 | |
| 4482 | /* |
| 4483 | * Main entry point into mballoc to allocate blocks |
| 4484 | * it tries to use preallocation first, then falls back |
| 4485 | * to usual allocation |
| 4486 | */ |
| 4487 | ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle, |
Aditya Kali | 6c7a120 | 2010-08-05 16:22:24 -0400 | [diff] [blame] | 4488 | struct ext4_allocation_request *ar, int *errp) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4489 | { |
Aneesh Kumar K.V | 6bc6e63 | 2008-10-10 09:39:00 -0400 | [diff] [blame] | 4490 | int freed; |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4491 | struct ext4_allocation_context *ac = NULL; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4492 | struct ext4_sb_info *sbi; |
| 4493 | struct super_block *sb; |
| 4494 | ext4_fsblk_t block = 0; |
Mingming Cao | 60e58e0 | 2009-01-22 18:13:05 +0100 | [diff] [blame] | 4495 | unsigned int inquota = 0; |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4496 | unsigned int reserv_clstrs = 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4497 | |
Theodore Ts'o | b10a44c | 2013-04-03 22:00:52 -0400 | [diff] [blame] | 4498 | might_sleep(); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4499 | sb = ar->inode->i_sb; |
| 4500 | sbi = EXT4_SB(sb); |
| 4501 | |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 4502 | trace_ext4_request_blocks(ar); |
Theodore Ts'o | ba80b10 | 2009-01-03 20:03:21 -0500 | [diff] [blame] | 4503 | |
Dmitry Monakhov | 45dc63e | 2011-10-20 20:07:23 -0400 | [diff] [blame] | 4504 | /* Allow to use superuser reservation for quota file */ |
Tahsin Erdogan | 02749a4 | 2017-06-22 11:31:25 -0400 | [diff] [blame] | 4505 | if (ext4_is_quota_file(ar->inode)) |
Dmitry Monakhov | 45dc63e | 2011-10-20 20:07:23 -0400 | [diff] [blame] | 4506 | ar->flags |= EXT4_MB_USE_ROOT_BLOCKS; |
| 4507 | |
Theodore Ts'o | e3cf5d5 | 2014-09-04 18:07:25 -0400 | [diff] [blame] | 4508 | if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) { |
Mingming Cao | 60e58e0 | 2009-01-22 18:13:05 +0100 | [diff] [blame] | 4509 | /* Without delayed allocation we need to verify |
| 4510 | * there is enough free blocks to do block allocation |
| 4511 | * and verify allocation doesn't exceed the quota limits. |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 4512 | */ |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 4513 | while (ar->len && |
Theodore Ts'o | e7d5f31 | 2011-09-09 19:14:51 -0400 | [diff] [blame] | 4514 | ext4_claim_free_clusters(sbi, ar->len, ar->flags)) { |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 4515 | |
Aneesh Kumar K.V | 030ba6b | 2008-09-08 23:14:50 -0400 | [diff] [blame] | 4516 | /* let others to free the space */ |
Lukas Czerner | bb8b20e | 2013-03-10 22:28:09 -0400 | [diff] [blame] | 4517 | cond_resched(); |
Aneesh Kumar K.V | 030ba6b | 2008-09-08 23:14:50 -0400 | [diff] [blame] | 4518 | ar->len = ar->len >> 1; |
| 4519 | } |
| 4520 | if (!ar->len) { |
Aneesh Kumar K.V | a30d542a | 2008-10-09 10:56:23 -0400 | [diff] [blame] | 4521 | *errp = -ENOSPC; |
| 4522 | return 0; |
| 4523 | } |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4524 | reserv_clstrs = ar->len; |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 4525 | if (ar->flags & EXT4_MB_USE_ROOT_BLOCKS) { |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4526 | dquot_alloc_block_nofail(ar->inode, |
| 4527 | EXT4_C2B(sbi, ar->len)); |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 4528 | } else { |
| 4529 | while (ar->len && |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4530 | dquot_alloc_block(ar->inode, |
| 4531 | EXT4_C2B(sbi, ar->len))) { |
Allison Henderson | 55f020d | 2011-05-25 07:41:26 -0400 | [diff] [blame] | 4532 | |
| 4533 | ar->flags |= EXT4_MB_HINT_NOPREALLOC; |
| 4534 | ar->len--; |
| 4535 | } |
Mingming Cao | 60e58e0 | 2009-01-22 18:13:05 +0100 | [diff] [blame] | 4536 | } |
| 4537 | inquota = ar->len; |
| 4538 | if (ar->len == 0) { |
| 4539 | *errp = -EDQUOT; |
Aditya Kali | 6c7a120 | 2010-08-05 16:22:24 -0400 | [diff] [blame] | 4540 | goto out; |
Mingming Cao | 60e58e0 | 2009-01-22 18:13:05 +0100 | [diff] [blame] | 4541 | } |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 4542 | } |
Mingming Cao | d2a1763 | 2008-07-14 17:52:37 -0400 | [diff] [blame] | 4543 | |
Wei Yongjun | 85556c9 | 2012-09-26 20:43:37 -0400 | [diff] [blame] | 4544 | ac = kmem_cache_zalloc(ext4_ac_cachep, GFP_NOFS); |
Theodore Ts'o | 833576b | 2009-07-13 09:45:52 -0400 | [diff] [blame] | 4545 | if (!ac) { |
Shen Feng | 363d425 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 4546 | ar->len = 0; |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4547 | *errp = -ENOMEM; |
Aditya Kali | 6c7a120 | 2010-08-05 16:22:24 -0400 | [diff] [blame] | 4548 | goto out; |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4549 | } |
| 4550 | |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4551 | *errp = ext4_mb_initialize_context(ac, ar); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4552 | if (*errp) { |
| 4553 | ar->len = 0; |
Aditya Kali | 6c7a120 | 2010-08-05 16:22:24 -0400 | [diff] [blame] | 4554 | goto out; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4555 | } |
| 4556 | |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4557 | ac->ac_op = EXT4_MB_HISTORY_PREALLOC; |
| 4558 | if (!ext4_mb_use_preallocated(ac)) { |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4559 | ac->ac_op = EXT4_MB_HISTORY_ALLOC; |
| 4560 | ext4_mb_normalize_request(ac, ar); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4561 | repeat: |
| 4562 | /* allocate space in core */ |
Aditya Kali | 6c7a120 | 2010-08-05 16:22:24 -0400 | [diff] [blame] | 4563 | *errp = ext4_mb_regular_allocator(ac); |
Alexey Khoroshilov | 2c00ef3 | 2013-07-01 08:12:36 -0400 | [diff] [blame] | 4564 | if (*errp) |
| 4565 | goto discard_and_exit; |
| 4566 | |
| 4567 | /* as we've just preallocated more space than |
| 4568 | * user requested originally, we store allocated |
| 4569 | * space in a special descriptor */ |
| 4570 | if (ac->ac_status == AC_STATUS_FOUND && |
| 4571 | ac->ac_o_ex.fe_len < ac->ac_b_ex.fe_len) |
| 4572 | *errp = ext4_mb_new_preallocation(ac); |
Eric Sandeen | 6d138ce | 2012-11-08 11:11:59 -0500 | [diff] [blame] | 4573 | if (*errp) { |
Alexey Khoroshilov | 2c00ef3 | 2013-07-01 08:12:36 -0400 | [diff] [blame] | 4574 | discard_and_exit: |
Eric Sandeen | 6d138ce | 2012-11-08 11:11:59 -0500 | [diff] [blame] | 4575 | ext4_discard_allocated_blocks(ac); |
Aditya Kali | 6c7a120 | 2010-08-05 16:22:24 -0400 | [diff] [blame] | 4576 | goto errout; |
Eric Sandeen | 6d138ce | 2012-11-08 11:11:59 -0500 | [diff] [blame] | 4577 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4578 | } |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4579 | if (likely(ac->ac_status == AC_STATUS_FOUND)) { |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4580 | *errp = ext4_mb_mark_diskspace_used(ac, handle, reserv_clstrs); |
Vegard Nossum | 554a5cc | 2016-07-14 23:02:47 -0400 | [diff] [blame] | 4581 | if (*errp) { |
Curt Wohlgemuth | b844167 | 2009-12-08 22:18:25 -0500 | [diff] [blame] | 4582 | ext4_discard_allocated_blocks(ac); |
Eric Sandeen | 6d138ce | 2012-11-08 11:11:59 -0500 | [diff] [blame] | 4583 | goto errout; |
| 4584 | } else { |
Aneesh Kumar K.V | 519deca0 | 2008-05-15 14:43:20 -0400 | [diff] [blame] | 4585 | block = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); |
| 4586 | ar->len = ac->ac_b_ex.fe_len; |
| 4587 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4588 | } else { |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4589 | freed = ext4_mb_discard_preallocations(sb, ac->ac_o_ex.fe_len); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4590 | if (freed) |
| 4591 | goto repeat; |
| 4592 | *errp = -ENOSPC; |
Aditya Kali | 6c7a120 | 2010-08-05 16:22:24 -0400 | [diff] [blame] | 4593 | } |
| 4594 | |
Eric Sandeen | 6d138ce | 2012-11-08 11:11:59 -0500 | [diff] [blame] | 4595 | errout: |
Aditya Kali | 6c7a120 | 2010-08-05 16:22:24 -0400 | [diff] [blame] | 4596 | if (*errp) { |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4597 | ac->ac_b_ex.fe_len = 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4598 | ar->len = 0; |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4599 | ext4_mb_show_ac(ac); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4600 | } |
Eric Sandeen | 256bdb4 | 2008-02-10 01:13:33 -0500 | [diff] [blame] | 4601 | ext4_mb_release_context(ac); |
Aditya Kali | 6c7a120 | 2010-08-05 16:22:24 -0400 | [diff] [blame] | 4602 | out: |
| 4603 | if (ac) |
| 4604 | kmem_cache_free(ext4_ac_cachep, ac); |
Mingming Cao | 60e58e0 | 2009-01-22 18:13:05 +0100 | [diff] [blame] | 4605 | if (inquota && ar->len < inquota) |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4606 | dquot_free_block(ar->inode, EXT4_C2B(sbi, inquota - ar->len)); |
Aneesh Kumar K.V | 0087d9f | 2009-01-05 21:49:12 -0500 | [diff] [blame] | 4607 | if (!ar->len) { |
Theodore Ts'o | e3cf5d5 | 2014-09-04 18:07:25 -0400 | [diff] [blame] | 4608 | if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) |
Aneesh Kumar K.V | 0087d9f | 2009-01-05 21:49:12 -0500 | [diff] [blame] | 4609 | /* release all the reserved blocks if non delalloc */ |
Theodore Ts'o | 5704265 | 2011-09-09 18:56:51 -0400 | [diff] [blame] | 4610 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
Theodore Ts'o | 53accfa | 2011-09-09 18:48:51 -0400 | [diff] [blame] | 4611 | reserv_clstrs); |
Aneesh Kumar K.V | 0087d9f | 2009-01-05 21:49:12 -0500 | [diff] [blame] | 4612 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4613 | |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 4614 | trace_ext4_allocate_blocks(ar, (unsigned long long)block); |
Theodore Ts'o | ba80b10 | 2009-01-03 20:03:21 -0500 | [diff] [blame] | 4615 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4616 | return block; |
| 4617 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4618 | |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4619 | /* |
| 4620 | * We can merge two free data extents only if the physical blocks |
| 4621 | * are contiguous, AND the extents were freed by the same transaction, |
| 4622 | * AND the blocks are associated with the same group. |
| 4623 | */ |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 4624 | static void ext4_try_merge_freed_extent(struct ext4_sb_info *sbi, |
| 4625 | struct ext4_free_data *entry, |
| 4626 | struct ext4_free_data *new_entry, |
| 4627 | struct rb_root *entry_rb_root) |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4628 | { |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 4629 | if ((entry->efd_tid != new_entry->efd_tid) || |
| 4630 | (entry->efd_group != new_entry->efd_group)) |
| 4631 | return; |
| 4632 | if (entry->efd_start_cluster + entry->efd_count == |
| 4633 | new_entry->efd_start_cluster) { |
| 4634 | new_entry->efd_start_cluster = entry->efd_start_cluster; |
| 4635 | new_entry->efd_count += entry->efd_count; |
| 4636 | } else if (new_entry->efd_start_cluster + new_entry->efd_count == |
| 4637 | entry->efd_start_cluster) { |
| 4638 | new_entry->efd_count += entry->efd_count; |
| 4639 | } else |
| 4640 | return; |
| 4641 | spin_lock(&sbi->s_md_lock); |
| 4642 | list_del(&entry->efd_list); |
| 4643 | spin_unlock(&sbi->s_md_lock); |
| 4644 | rb_erase(&entry->efd_node, entry_rb_root); |
| 4645 | kmem_cache_free(ext4_free_data_cachep, entry); |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4646 | } |
| 4647 | |
Eric Sandeen | 4ddfef7 | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 4648 | static noinline_for_stack int |
| 4649 | ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b, |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 4650 | struct ext4_free_data *new_entry) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4651 | { |
Theodore Ts'o | e29136f | 2010-06-29 12:54:28 -0400 | [diff] [blame] | 4652 | ext4_group_t group = e4b->bd_group; |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4653 | ext4_grpblk_t cluster; |
Theodore Ts'o | d08854f | 2016-06-26 18:24:01 -0400 | [diff] [blame] | 4654 | ext4_grpblk_t clusters = new_entry->efd_count; |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 4655 | struct ext4_free_data *entry; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4656 | struct ext4_group_info *db = e4b->bd_info; |
| 4657 | struct super_block *sb = e4b->bd_sb; |
| 4658 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4659 | struct rb_node **n = &db->bb_free_root.rb_node, *node; |
| 4660 | struct rb_node *parent = NULL, *new_node; |
| 4661 | |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 4662 | BUG_ON(!ext4_handle_valid(handle)); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4663 | BUG_ON(e4b->bd_bitmap_page == NULL); |
| 4664 | BUG_ON(e4b->bd_buddy_page == NULL); |
| 4665 | |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 4666 | new_node = &new_entry->efd_node; |
| 4667 | cluster = new_entry->efd_start_cluster; |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4668 | |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4669 | if (!*n) { |
| 4670 | /* first free block exent. We need to |
| 4671 | protect buddy cache from being freed, |
| 4672 | * otherwise we'll refresh it from |
| 4673 | * on-disk bitmap and lose not-yet-available |
| 4674 | * blocks */ |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 4675 | get_page(e4b->bd_buddy_page); |
| 4676 | get_page(e4b->bd_bitmap_page); |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4677 | } |
| 4678 | while (*n) { |
| 4679 | parent = *n; |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 4680 | entry = rb_entry(parent, struct ext4_free_data, efd_node); |
| 4681 | if (cluster < entry->efd_start_cluster) |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4682 | n = &(*n)->rb_left; |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 4683 | else if (cluster >= (entry->efd_start_cluster + entry->efd_count)) |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4684 | n = &(*n)->rb_right; |
| 4685 | else { |
Theodore Ts'o | e29136f | 2010-06-29 12:54:28 -0400 | [diff] [blame] | 4686 | ext4_grp_locked_error(sb, group, 0, |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4687 | ext4_group_first_block_no(sb, group) + |
| 4688 | EXT4_C2B(sbi, cluster), |
Theodore Ts'o | e29136f | 2010-06-29 12:54:28 -0400 | [diff] [blame] | 4689 | "Block already on to-be-freed list"); |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4690 | return 0; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4691 | } |
| 4692 | } |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4693 | |
| 4694 | rb_link_node(new_node, parent, n); |
| 4695 | rb_insert_color(new_node, &db->bb_free_root); |
| 4696 | |
| 4697 | /* Now try to see the extent can be merged to left and right */ |
| 4698 | node = rb_prev(new_node); |
| 4699 | if (node) { |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 4700 | entry = rb_entry(node, struct ext4_free_data, efd_node); |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 4701 | ext4_try_merge_freed_extent(sbi, entry, new_entry, |
| 4702 | &(db->bb_free_root)); |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4703 | } |
| 4704 | |
| 4705 | node = rb_next(new_node); |
| 4706 | if (node) { |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 4707 | entry = rb_entry(node, struct ext4_free_data, efd_node); |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 4708 | ext4_try_merge_freed_extent(sbi, entry, new_entry, |
| 4709 | &(db->bb_free_root)); |
Aneesh Kumar K.V | c894058 | 2008-10-16 10:14:27 -0400 | [diff] [blame] | 4710 | } |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 4711 | |
Theodore Ts'o | d08854f | 2016-06-26 18:24:01 -0400 | [diff] [blame] | 4712 | spin_lock(&sbi->s_md_lock); |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 4713 | list_add_tail(&new_entry->efd_list, &sbi->s_freed_data_list); |
Theodore Ts'o | d08854f | 2016-06-26 18:24:01 -0400 | [diff] [blame] | 4714 | sbi->s_mb_free_pending += clusters; |
| 4715 | spin_unlock(&sbi->s_md_lock); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4716 | return 0; |
| 4717 | } |
| 4718 | |
Theodore Ts'o | 4433871 | 2009-11-22 07:44:56 -0500 | [diff] [blame] | 4719 | /** |
| 4720 | * ext4_free_blocks() -- Free given blocks and update quota |
| 4721 | * @handle: handle for this transaction |
| 4722 | * @inode: inode |
| 4723 | * @block: start physical block to free |
| 4724 | * @count: number of blocks to count |
Yongqiang Yang | 5def136 | 2011-06-05 23:26:40 -0400 | [diff] [blame] | 4725 | * @flags: flags used by ext4_free_blocks |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4726 | */ |
Theodore Ts'o | 4433871 | 2009-11-22 07:44:56 -0500 | [diff] [blame] | 4727 | void ext4_free_blocks(handle_t *handle, struct inode *inode, |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 4728 | struct buffer_head *bh, ext4_fsblk_t block, |
| 4729 | unsigned long count, int flags) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4730 | { |
Aneesh Kumar K.V | 26346ff | 2008-02-10 01:10:04 -0500 | [diff] [blame] | 4731 | struct buffer_head *bitmap_bh = NULL; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4732 | struct super_block *sb = inode->i_sb; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4733 | struct ext4_group_desc *gdp; |
Theodore Ts'o | 498e5f2 | 2008-11-05 00:14:04 -0500 | [diff] [blame] | 4734 | unsigned int overflow; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4735 | ext4_grpblk_t bit; |
| 4736 | struct buffer_head *gd_bh; |
| 4737 | ext4_group_t block_group; |
| 4738 | struct ext4_sb_info *sbi; |
| 4739 | struct ext4_buddy e4b; |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4740 | unsigned int count_clusters; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4741 | int err = 0; |
| 4742 | int ret; |
| 4743 | |
Theodore Ts'o | b10a44c | 2013-04-03 22:00:52 -0400 | [diff] [blame] | 4744 | might_sleep(); |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 4745 | if (bh) { |
| 4746 | if (block) |
| 4747 | BUG_ON(block != bh->b_blocknr); |
| 4748 | else |
| 4749 | block = bh->b_blocknr; |
| 4750 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4751 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4752 | sbi = EXT4_SB(sb); |
Theodore Ts'o | 1f2acb6 | 2010-01-22 17:40:42 -0500 | [diff] [blame] | 4753 | if (!(flags & EXT4_FREE_BLOCKS_VALIDATED) && |
| 4754 | !ext4_data_block_valid(sbi, block, count)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 4755 | ext4_error(sb, "Freeing blocks not in datazone - " |
Theodore Ts'o | 1f2acb6 | 2010-01-22 17:40:42 -0500 | [diff] [blame] | 4756 | "block = %llu, count = %lu", block, count); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4757 | goto error_return; |
| 4758 | } |
| 4759 | |
Theodore Ts'o | 0610b6e | 2009-06-15 03:45:05 -0400 | [diff] [blame] | 4760 | ext4_debug("freeing block %llu\n", block); |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 4761 | trace_ext4_free_blocks(inode, block, count, flags); |
| 4762 | |
Daeho Jeong | 9c02ac9 | 2015-10-17 22:28:21 -0400 | [diff] [blame] | 4763 | if (bh && (flags & EXT4_FREE_BLOCKS_FORGET)) { |
| 4764 | BUG_ON(count > 1); |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 4765 | |
Daeho Jeong | 9c02ac9 | 2015-10-17 22:28:21 -0400 | [diff] [blame] | 4766 | ext4_forget(handle, flags & EXT4_FREE_BLOCKS_METADATA, |
| 4767 | inode, bh, block); |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 4768 | } |
| 4769 | |
Theodore Ts'o | 60e6679 | 2010-05-17 07:00:00 -0400 | [diff] [blame] | 4770 | /* |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4771 | * If the extent to be freed does not begin on a cluster |
| 4772 | * boundary, we need to deal with partial clusters at the |
| 4773 | * beginning and end of the extent. Normally we will free |
| 4774 | * blocks at the beginning or the end unless we are explicitly |
| 4775 | * requested to avoid doing so. |
| 4776 | */ |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 4777 | overflow = EXT4_PBLK_COFF(sbi, block); |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4778 | if (overflow) { |
| 4779 | if (flags & EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER) { |
| 4780 | overflow = sbi->s_cluster_ratio - overflow; |
| 4781 | block += overflow; |
| 4782 | if (count > overflow) |
| 4783 | count -= overflow; |
| 4784 | else |
| 4785 | return; |
| 4786 | } else { |
| 4787 | block -= overflow; |
| 4788 | count += overflow; |
| 4789 | } |
| 4790 | } |
Theodore Ts'o | f5a44db | 2013-12-20 09:29:35 -0500 | [diff] [blame] | 4791 | overflow = EXT4_LBLK_COFF(sbi, count); |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4792 | if (overflow) { |
| 4793 | if (flags & EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER) { |
| 4794 | if (count > overflow) |
| 4795 | count -= overflow; |
| 4796 | else |
| 4797 | return; |
| 4798 | } else |
| 4799 | count += sbi->s_cluster_ratio - overflow; |
| 4800 | } |
| 4801 | |
Daeho Jeong | 9c02ac9 | 2015-10-17 22:28:21 -0400 | [diff] [blame] | 4802 | if (!bh && (flags & EXT4_FREE_BLOCKS_FORGET)) { |
| 4803 | int i; |
Daeho Jeong | f96c450 | 2016-02-21 18:31:41 -0500 | [diff] [blame] | 4804 | int is_metadata = flags & EXT4_FREE_BLOCKS_METADATA; |
Daeho Jeong | 9c02ac9 | 2015-10-17 22:28:21 -0400 | [diff] [blame] | 4805 | |
| 4806 | for (i = 0; i < count; i++) { |
| 4807 | cond_resched(); |
Daeho Jeong | f96c450 | 2016-02-21 18:31:41 -0500 | [diff] [blame] | 4808 | if (is_metadata) |
| 4809 | bh = sb_find_get_block(inode->i_sb, block + i); |
| 4810 | ext4_forget(handle, is_metadata, inode, bh, block + i); |
Daeho Jeong | 9c02ac9 | 2015-10-17 22:28:21 -0400 | [diff] [blame] | 4811 | } |
| 4812 | } |
| 4813 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4814 | do_more: |
| 4815 | overflow = 0; |
| 4816 | ext4_get_group_no_and_offset(sb, block, &block_group, &bit); |
| 4817 | |
Darrick J. Wong | 163a203 | 2013-08-28 17:35:51 -0400 | [diff] [blame] | 4818 | if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT( |
| 4819 | ext4_get_group_info(sb, block_group)))) |
| 4820 | return; |
| 4821 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4822 | /* |
| 4823 | * Check to see if we are freeing blocks across a group |
| 4824 | * boundary. |
| 4825 | */ |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4826 | if (EXT4_C2B(sbi, bit) + count > EXT4_BLOCKS_PER_GROUP(sb)) { |
| 4827 | overflow = EXT4_C2B(sbi, bit) + count - |
| 4828 | EXT4_BLOCKS_PER_GROUP(sb); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4829 | count -= overflow; |
| 4830 | } |
Lukas Czerner | 810da24 | 2013-03-02 17:18:58 -0500 | [diff] [blame] | 4831 | count_clusters = EXT4_NUM_B2C(sbi, count); |
Theodore Ts'o | 574ca17 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 4832 | bitmap_bh = ext4_read_block_bitmap(sb, block_group); |
Darrick J. Wong | 9008a58 | 2015-10-17 21:33:24 -0400 | [diff] [blame] | 4833 | if (IS_ERR(bitmap_bh)) { |
| 4834 | err = PTR_ERR(bitmap_bh); |
| 4835 | bitmap_bh = NULL; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4836 | goto error_return; |
Aneesh Kumar K.V | ce89f46 | 2008-07-23 14:09:29 -0400 | [diff] [blame] | 4837 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4838 | gdp = ext4_get_group_desc(sb, block_group, &gd_bh); |
Aneesh Kumar K.V | ce89f46 | 2008-07-23 14:09:29 -0400 | [diff] [blame] | 4839 | if (!gdp) { |
| 4840 | err = -EIO; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4841 | goto error_return; |
Aneesh Kumar K.V | ce89f46 | 2008-07-23 14:09:29 -0400 | [diff] [blame] | 4842 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4843 | |
| 4844 | if (in_range(ext4_block_bitmap(sb, gdp), block, count) || |
| 4845 | in_range(ext4_inode_bitmap(sb, gdp), block, count) || |
| 4846 | in_range(block, ext4_inode_table(sb, gdp), |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4847 | EXT4_SB(sb)->s_itb_per_group) || |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4848 | in_range(block + count - 1, ext4_inode_table(sb, gdp), |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4849 | EXT4_SB(sb)->s_itb_per_group)) { |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4850 | |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 4851 | ext4_error(sb, "Freeing blocks in system zone - " |
Theodore Ts'o | 0610b6e | 2009-06-15 03:45:05 -0400 | [diff] [blame] | 4852 | "Block = %llu, count = %lu", block, count); |
Aneesh Kumar K.V | 519deca0 | 2008-05-15 14:43:20 -0400 | [diff] [blame] | 4853 | /* err = 0. ext4_std_error should be a no op */ |
| 4854 | goto error_return; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4855 | } |
| 4856 | |
| 4857 | BUFFER_TRACE(bitmap_bh, "getting write access"); |
| 4858 | err = ext4_journal_get_write_access(handle, bitmap_bh); |
| 4859 | if (err) |
| 4860 | goto error_return; |
| 4861 | |
| 4862 | /* |
| 4863 | * We are about to modify some metadata. Call the journal APIs |
| 4864 | * to unshare ->b_data if a currently-committing transaction is |
| 4865 | * using it |
| 4866 | */ |
| 4867 | BUFFER_TRACE(gd_bh, "get_write_access"); |
| 4868 | err = ext4_journal_get_write_access(handle, gd_bh); |
| 4869 | if (err) |
| 4870 | goto error_return; |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4871 | #ifdef AGGRESSIVE_CHECK |
| 4872 | { |
| 4873 | int i; |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4874 | for (i = 0; i < count_clusters; i++) |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4875 | BUG_ON(!mb_test_bit(bit + i, bitmap_bh->b_data)); |
| 4876 | } |
| 4877 | #endif |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4878 | trace_ext4_mballoc_free(sb, inode, block_group, bit, count_clusters); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4879 | |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 4880 | /* __GFP_NOFAIL: retry infinitely, ignore TIF_MEMDIE and memcg limit. */ |
| 4881 | err = ext4_mb_load_buddy_gfp(sb, block_group, &e4b, |
| 4882 | GFP_NOFS|__GFP_NOFAIL); |
Aneesh Kumar K.V | 920313a | 2009-01-05 21:36:19 -0500 | [diff] [blame] | 4883 | if (err) |
| 4884 | goto error_return; |
Theodore Ts'o | e636260 | 2009-11-23 07:17:05 -0500 | [diff] [blame] | 4885 | |
Daeho Jeong | f96c450 | 2016-02-21 18:31:41 -0500 | [diff] [blame] | 4886 | /* |
| 4887 | * We need to make sure we don't reuse the freed block until after the |
| 4888 | * transaction is committed. We make an exception if the inode is to be |
| 4889 | * written in writeback mode since writeback mode has weak data |
| 4890 | * consistency guarantees. |
| 4891 | */ |
| 4892 | if (ext4_handle_valid(handle) && |
| 4893 | ((flags & EXT4_FREE_BLOCKS_METADATA) || |
| 4894 | !ext4_should_writeback_data(inode))) { |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 4895 | struct ext4_free_data *new_entry; |
| 4896 | /* |
Michal Hocko | 7444a07 | 2015-07-05 12:33:44 -0400 | [diff] [blame] | 4897 | * We use __GFP_NOFAIL because ext4_free_blocks() is not allowed |
| 4898 | * to fail. |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 4899 | */ |
Michal Hocko | 7444a07 | 2015-07-05 12:33:44 -0400 | [diff] [blame] | 4900 | new_entry = kmem_cache_alloc(ext4_free_data_cachep, |
| 4901 | GFP_NOFS|__GFP_NOFAIL); |
Bobi Jam | 18aadd4 | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 4902 | new_entry->efd_start_cluster = bit; |
| 4903 | new_entry->efd_group = block_group; |
| 4904 | new_entry->efd_count = count_clusters; |
| 4905 | new_entry->efd_tid = handle->h_transaction->t_tid; |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 4906 | |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 4907 | ext4_lock_group(sb, block_group); |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4908 | mb_clear_bits(bitmap_bh->b_data, bit, count_clusters); |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 4909 | ext4_mb_free_metadata(handle, &e4b, new_entry); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4910 | } else { |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 4911 | /* need to update group_info->bb_free and bitmap |
| 4912 | * with group lock held. generate_buddy look at |
| 4913 | * them with group lock_held |
| 4914 | */ |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 4915 | if (test_opt(sb, DISCARD)) { |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 4916 | err = ext4_issue_discard(sb, block_group, bit, count, |
| 4917 | NULL); |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 4918 | if (err && err != -EOPNOTSUPP) |
| 4919 | ext4_msg(sb, KERN_WARNING, "discard request in" |
| 4920 | " group:%d block:%d count:%lu failed" |
| 4921 | " with %d", block_group, bit, count, |
| 4922 | err); |
Lukas Czerner | 8f9ff18 | 2013-10-30 11:10:52 -0400 | [diff] [blame] | 4923 | } else |
| 4924 | EXT4_MB_GRP_CLEAR_TRIMMED(e4b.bd_info); |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 4925 | |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 4926 | ext4_lock_group(sb, block_group); |
Theodore Ts'o | 8413019 | 2011-09-09 18:50:51 -0400 | [diff] [blame] | 4927 | mb_clear_bits(bitmap_bh->b_data, bit, count_clusters); |
| 4928 | mb_free_blocks(inode, &e4b, bit, count_clusters); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4929 | } |
| 4930 | |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 4931 | ret = ext4_free_group_clusters(sb, gdp) + count_clusters; |
| 4932 | ext4_free_group_clusters_set(sb, gdp, ret); |
Tao Ma | 79f1ba4 | 2012-10-22 00:34:32 -0400 | [diff] [blame] | 4933 | ext4_block_bitmap_csum_set(sb, block_group, gdp, bitmap_bh); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 4934 | ext4_group_desc_csum_set(sb, block_group, gdp); |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 4935 | ext4_unlock_group(sb, block_group); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4936 | |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 4937 | if (sbi->s_log_groups_per_flex) { |
| 4938 | ext4_group_t flex_group = ext4_flex_group(sbi, block_group); |
Theodore Ts'o | 90ba983 | 2013-03-11 23:39:59 -0400 | [diff] [blame] | 4939 | atomic64_add(count_clusters, |
| 4940 | &sbi->s_flex_groups[flex_group].free_clusters); |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 4941 | } |
| 4942 | |
Theodore Ts'o | 71d4f7d | 2014-07-15 06:02:38 -0400 | [diff] [blame] | 4943 | if (!(flags & EXT4_FREE_BLOCKS_NO_QUOT_UPDATE)) |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4944 | dquot_free_block(inode, EXT4_C2B(sbi, count_clusters)); |
Jan Kara | 7d73453 | 2013-08-17 09:36:54 -0400 | [diff] [blame] | 4945 | percpu_counter_add(&sbi->s_freeclusters_counter, count_clusters); |
| 4946 | |
| 4947 | ext4_mb_unload_buddy(&e4b); |
Aditya Kali | 7b415bf | 2011-09-09 19:04:51 -0400 | [diff] [blame] | 4948 | |
Aneesh Kumar K.V | 7a2fcbf | 2009-01-05 21:36:55 -0500 | [diff] [blame] | 4949 | /* We dirtied the bitmap block */ |
| 4950 | BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); |
| 4951 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); |
| 4952 | |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4953 | /* And the group descriptor block */ |
| 4954 | BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 4955 | ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4956 | if (!err) |
| 4957 | err = ret; |
| 4958 | |
| 4959 | if (overflow && !err) { |
| 4960 | block += count; |
| 4961 | count = overflow; |
| 4962 | put_bh(bitmap_bh); |
| 4963 | goto do_more; |
| 4964 | } |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4965 | error_return: |
| 4966 | brelse(bitmap_bh); |
| 4967 | ext4_std_error(sb, err); |
Alex Tomas | c9de560 | 2008-01-29 00:19:52 -0500 | [diff] [blame] | 4968 | return; |
| 4969 | } |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 4970 | |
| 4971 | /** |
Yongqiang Yang | 0529155 | 2011-07-26 21:43:56 -0400 | [diff] [blame] | 4972 | * ext4_group_add_blocks() -- Add given blocks to an existing group |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 4973 | * @handle: handle to this transaction |
| 4974 | * @sb: super block |
Anatol Pomozov | 4907cb7 | 2012-09-01 10:31:09 -0700 | [diff] [blame] | 4975 | * @block: start physical block to add to the block group |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 4976 | * @count: number of blocks to free |
| 4977 | * |
Amir Goldstein | e73a347 | 2011-05-09 21:40:01 -0400 | [diff] [blame] | 4978 | * This marks the blocks as free in the bitmap and buddy. |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 4979 | */ |
Yongqiang Yang | cc7365d | 2011-07-26 21:46:07 -0400 | [diff] [blame] | 4980 | int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 4981 | ext4_fsblk_t block, unsigned long count) |
| 4982 | { |
| 4983 | struct buffer_head *bitmap_bh = NULL; |
| 4984 | struct buffer_head *gd_bh; |
| 4985 | ext4_group_t block_group; |
| 4986 | ext4_grpblk_t bit; |
| 4987 | unsigned int i; |
| 4988 | struct ext4_group_desc *desc; |
| 4989 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Amir Goldstein | e73a347 | 2011-05-09 21:40:01 -0400 | [diff] [blame] | 4990 | struct ext4_buddy e4b; |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 4991 | int err = 0, ret, blk_free_count; |
| 4992 | ext4_grpblk_t blocks_freed; |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 4993 | |
| 4994 | ext4_debug("Adding block(s) %llu-%llu\n", block, block + count - 1); |
| 4995 | |
Yongqiang Yang | 4740b83 | 2011-07-26 21:51:08 -0400 | [diff] [blame] | 4996 | if (count == 0) |
| 4997 | return 0; |
| 4998 | |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 4999 | ext4_get_group_no_and_offset(sb, block, &block_group, &bit); |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5000 | /* |
| 5001 | * Check to see if we are freeing blocks across a group |
| 5002 | * boundary. |
| 5003 | */ |
Yongqiang Yang | cc7365d | 2011-07-26 21:46:07 -0400 | [diff] [blame] | 5004 | if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) { |
Jakub Wilk | 8d2ae1c | 2016-04-27 01:11:21 -0400 | [diff] [blame] | 5005 | ext4_warning(sb, "too much blocks added to group %u", |
Yongqiang Yang | cc7365d | 2011-07-26 21:46:07 -0400 | [diff] [blame] | 5006 | block_group); |
| 5007 | err = -EINVAL; |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5008 | goto error_return; |
Yongqiang Yang | cc7365d | 2011-07-26 21:46:07 -0400 | [diff] [blame] | 5009 | } |
Theodore Ts'o | 2cd05cc | 2011-05-09 10:58:45 -0400 | [diff] [blame] | 5010 | |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5011 | bitmap_bh = ext4_read_block_bitmap(sb, block_group); |
Darrick J. Wong | 9008a58 | 2015-10-17 21:33:24 -0400 | [diff] [blame] | 5012 | if (IS_ERR(bitmap_bh)) { |
| 5013 | err = PTR_ERR(bitmap_bh); |
| 5014 | bitmap_bh = NULL; |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5015 | goto error_return; |
Yongqiang Yang | cc7365d | 2011-07-26 21:46:07 -0400 | [diff] [blame] | 5016 | } |
| 5017 | |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5018 | desc = ext4_get_group_desc(sb, block_group, &gd_bh); |
Yongqiang Yang | cc7365d | 2011-07-26 21:46:07 -0400 | [diff] [blame] | 5019 | if (!desc) { |
| 5020 | err = -EIO; |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5021 | goto error_return; |
Yongqiang Yang | cc7365d | 2011-07-26 21:46:07 -0400 | [diff] [blame] | 5022 | } |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5023 | |
| 5024 | if (in_range(ext4_block_bitmap(sb, desc), block, count) || |
| 5025 | in_range(ext4_inode_bitmap(sb, desc), block, count) || |
| 5026 | in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) || |
| 5027 | in_range(block + count - 1, ext4_inode_table(sb, desc), |
| 5028 | sbi->s_itb_per_group)) { |
| 5029 | ext4_error(sb, "Adding blocks in system zones - " |
| 5030 | "Block = %llu, count = %lu", |
| 5031 | block, count); |
Yongqiang Yang | cc7365d | 2011-07-26 21:46:07 -0400 | [diff] [blame] | 5032 | err = -EINVAL; |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5033 | goto error_return; |
| 5034 | } |
| 5035 | |
Theodore Ts'o | 2cd05cc | 2011-05-09 10:58:45 -0400 | [diff] [blame] | 5036 | BUFFER_TRACE(bitmap_bh, "getting write access"); |
| 5037 | err = ext4_journal_get_write_access(handle, bitmap_bh); |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5038 | if (err) |
| 5039 | goto error_return; |
| 5040 | |
| 5041 | /* |
| 5042 | * We are about to modify some metadata. Call the journal APIs |
| 5043 | * to unshare ->b_data if a currently-committing transaction is |
| 5044 | * using it |
| 5045 | */ |
| 5046 | BUFFER_TRACE(gd_bh, "get_write_access"); |
| 5047 | err = ext4_journal_get_write_access(handle, gd_bh); |
| 5048 | if (err) |
| 5049 | goto error_return; |
Amir Goldstein | e73a347 | 2011-05-09 21:40:01 -0400 | [diff] [blame] | 5050 | |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5051 | for (i = 0, blocks_freed = 0; i < count; i++) { |
| 5052 | BUFFER_TRACE(bitmap_bh, "clear bit"); |
Amir Goldstein | e73a347 | 2011-05-09 21:40:01 -0400 | [diff] [blame] | 5053 | if (!mb_test_bit(bit + i, bitmap_bh->b_data)) { |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5054 | ext4_error(sb, "bit already cleared for block %llu", |
| 5055 | (ext4_fsblk_t)(block + i)); |
| 5056 | BUFFER_TRACE(bitmap_bh, "bit already cleared"); |
| 5057 | } else { |
| 5058 | blocks_freed++; |
| 5059 | } |
| 5060 | } |
Amir Goldstein | e73a347 | 2011-05-09 21:40:01 -0400 | [diff] [blame] | 5061 | |
| 5062 | err = ext4_mb_load_buddy(sb, block_group, &e4b); |
| 5063 | if (err) |
| 5064 | goto error_return; |
| 5065 | |
| 5066 | /* |
| 5067 | * need to update group_info->bb_free and bitmap |
| 5068 | * with group lock held. generate_buddy look at |
| 5069 | * them with group lock_held |
| 5070 | */ |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5071 | ext4_lock_group(sb, block_group); |
Amir Goldstein | e73a347 | 2011-05-09 21:40:01 -0400 | [diff] [blame] | 5072 | mb_clear_bits(bitmap_bh->b_data, bit, count); |
| 5073 | mb_free_blocks(NULL, &e4b, bit, count); |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 5074 | blk_free_count = blocks_freed + ext4_free_group_clusters(sb, desc); |
| 5075 | ext4_free_group_clusters_set(sb, desc, blk_free_count); |
Tao Ma | 79f1ba4 | 2012-10-22 00:34:32 -0400 | [diff] [blame] | 5076 | ext4_block_bitmap_csum_set(sb, block_group, desc, bitmap_bh); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 5077 | ext4_group_desc_csum_set(sb, block_group, desc); |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5078 | ext4_unlock_group(sb, block_group); |
Theodore Ts'o | 5704265 | 2011-09-09 18:56:51 -0400 | [diff] [blame] | 5079 | percpu_counter_add(&sbi->s_freeclusters_counter, |
Lukas Czerner | 810da24 | 2013-03-02 17:18:58 -0500 | [diff] [blame] | 5080 | EXT4_NUM_B2C(sbi, blocks_freed)); |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5081 | |
| 5082 | if (sbi->s_log_groups_per_flex) { |
| 5083 | ext4_group_t flex_group = ext4_flex_group(sbi, block_group); |
Theodore Ts'o | 90ba983 | 2013-03-11 23:39:59 -0400 | [diff] [blame] | 5084 | atomic64_add(EXT4_NUM_B2C(sbi, blocks_freed), |
| 5085 | &sbi->s_flex_groups[flex_group].free_clusters); |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5086 | } |
Amir Goldstein | e73a347 | 2011-05-09 21:40:01 -0400 | [diff] [blame] | 5087 | |
| 5088 | ext4_mb_unload_buddy(&e4b); |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5089 | |
| 5090 | /* We dirtied the bitmap block */ |
| 5091 | BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); |
| 5092 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); |
| 5093 | |
| 5094 | /* And the group descriptor block */ |
| 5095 | BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); |
| 5096 | ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh); |
| 5097 | if (!err) |
| 5098 | err = ret; |
| 5099 | |
| 5100 | error_return: |
| 5101 | brelse(bitmap_bh); |
| 5102 | ext4_std_error(sb, err); |
Yongqiang Yang | cc7365d | 2011-07-26 21:46:07 -0400 | [diff] [blame] | 5103 | return err; |
Amir Goldstein | 2846e82 | 2011-05-09 10:46:41 -0400 | [diff] [blame] | 5104 | } |
| 5105 | |
| 5106 | /** |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5107 | * ext4_trim_extent -- function to TRIM one single free extent in the group |
| 5108 | * @sb: super block for the file system |
| 5109 | * @start: starting block of the free extent in the alloc. group |
| 5110 | * @count: number of blocks to TRIM |
| 5111 | * @group: alloc. group we are working with |
| 5112 | * @e4b: ext4 buddy for the group |
| 5113 | * |
| 5114 | * Trim "count" blocks starting at "start" in the "group". To assure that no |
| 5115 | * one will allocate those blocks, mark it as used in buddy bitmap. This must |
| 5116 | * be called with under the group lock. |
| 5117 | */ |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 5118 | static int ext4_trim_extent(struct super_block *sb, int start, int count, |
Theodore Ts'o | d9f3450 | 2011-04-30 13:47:24 -0400 | [diff] [blame] | 5119 | ext4_group_t group, struct ext4_buddy *e4b) |
jon ernst | e2cbd58 | 2014-04-12 23:01:28 -0400 | [diff] [blame] | 5120 | __releases(bitlock) |
| 5121 | __acquires(bitlock) |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5122 | { |
| 5123 | struct ext4_free_extent ex; |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 5124 | int ret = 0; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5125 | |
Tao Ma | b3d4c2b | 2011-07-11 00:01:52 -0400 | [diff] [blame] | 5126 | trace_ext4_trim_extent(sb, group, start, count); |
| 5127 | |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5128 | assert_spin_locked(ext4_group_lock_ptr(sb, group)); |
| 5129 | |
| 5130 | ex.fe_start = start; |
| 5131 | ex.fe_group = group; |
| 5132 | ex.fe_len = count; |
| 5133 | |
| 5134 | /* |
| 5135 | * Mark blocks used, so no one can reuse them while |
| 5136 | * being trimmed. |
| 5137 | */ |
| 5138 | mb_mark_used(e4b, &ex); |
| 5139 | ext4_unlock_group(sb, group); |
Daeho Jeong | a015434 | 2017-06-22 23:54:33 -0400 | [diff] [blame^] | 5140 | ret = ext4_issue_discard(sb, group, start, count, NULL); |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5141 | ext4_lock_group(sb, group); |
| 5142 | mb_free_blocks(NULL, e4b, start, ex.fe_len); |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 5143 | return ret; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5144 | } |
| 5145 | |
| 5146 | /** |
| 5147 | * ext4_trim_all_free -- function to trim all free space in alloc. group |
| 5148 | * @sb: super block for file system |
Tao Ma | 2261228 | 2011-07-11 00:04:34 -0400 | [diff] [blame] | 5149 | * @group: group to be trimmed |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5150 | * @start: first group block to examine |
| 5151 | * @max: last group block to examine |
| 5152 | * @minblocks: minimum extent block count |
| 5153 | * |
| 5154 | * ext4_trim_all_free walks through group's buddy bitmap searching for free |
| 5155 | * extents. When the free block is found, ext4_trim_extent is called to TRIM |
| 5156 | * the extent. |
| 5157 | * |
| 5158 | * |
| 5159 | * ext4_trim_all_free walks through group's block bitmap searching for free |
| 5160 | * extents. When the free extent is found, mark it as used in group buddy |
| 5161 | * bitmap. Then issue a TRIM command on this extent and free the extent in |
| 5162 | * the group buddy bitmap. This is done until whole group is scanned. |
| 5163 | */ |
Lukas Czerner | 0b75a84 | 2011-02-23 12:22:49 -0500 | [diff] [blame] | 5164 | static ext4_grpblk_t |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5165 | ext4_trim_all_free(struct super_block *sb, ext4_group_t group, |
| 5166 | ext4_grpblk_t start, ext4_grpblk_t max, |
| 5167 | ext4_grpblk_t minblocks) |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5168 | { |
| 5169 | void *bitmap; |
Tao Ma | 169ddc3 | 2011-07-11 00:00:07 -0400 | [diff] [blame] | 5170 | ext4_grpblk_t next, count = 0, free_count = 0; |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5171 | struct ext4_buddy e4b; |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 5172 | int ret = 0; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5173 | |
Tao Ma | b3d4c2b | 2011-07-11 00:01:52 -0400 | [diff] [blame] | 5174 | trace_ext4_trim_all_free(sb, group, start, max); |
| 5175 | |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5176 | ret = ext4_mb_load_buddy(sb, group, &e4b); |
| 5177 | if (ret) { |
Konstantin Khlebnikov | 9651e6b | 2017-05-21 22:35:23 -0400 | [diff] [blame] | 5178 | ext4_warning(sb, "Error %d loading buddy information for %u", |
| 5179 | ret, group); |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5180 | return ret; |
| 5181 | } |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5182 | bitmap = e4b.bd_bitmap; |
Lukas Czerner | 28739ee | 2011-05-24 18:28:07 -0400 | [diff] [blame] | 5183 | |
| 5184 | ext4_lock_group(sb, group); |
Tao Ma | 3d56b8d | 2011-07-11 00:03:38 -0400 | [diff] [blame] | 5185 | if (EXT4_MB_GRP_WAS_TRIMMED(e4b.bd_info) && |
| 5186 | minblocks >= atomic_read(&EXT4_SB(sb)->s_last_trim_minblks)) |
| 5187 | goto out; |
| 5188 | |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5189 | start = (e4b.bd_info->bb_first_free > start) ? |
| 5190 | e4b.bd_info->bb_first_free : start; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5191 | |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5192 | while (start <= max) { |
| 5193 | start = mb_find_next_zero_bit(bitmap, max + 1, start); |
| 5194 | if (start > max) |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5195 | break; |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5196 | next = mb_find_next_bit(bitmap, max + 1, start); |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5197 | |
| 5198 | if ((next - start) >= minblocks) { |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 5199 | ret = ext4_trim_extent(sb, start, |
| 5200 | next - start, group, &e4b); |
| 5201 | if (ret && ret != -EOPNOTSUPP) |
| 5202 | break; |
| 5203 | ret = 0; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5204 | count += next - start; |
| 5205 | } |
Tao Ma | 169ddc3 | 2011-07-11 00:00:07 -0400 | [diff] [blame] | 5206 | free_count += next - start; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5207 | start = next + 1; |
| 5208 | |
| 5209 | if (fatal_signal_pending(current)) { |
| 5210 | count = -ERESTARTSYS; |
| 5211 | break; |
| 5212 | } |
| 5213 | |
| 5214 | if (need_resched()) { |
| 5215 | ext4_unlock_group(sb, group); |
| 5216 | cond_resched(); |
| 5217 | ext4_lock_group(sb, group); |
| 5218 | } |
| 5219 | |
Tao Ma | 169ddc3 | 2011-07-11 00:00:07 -0400 | [diff] [blame] | 5220 | if ((e4b.bd_info->bb_free - free_count) < minblocks) |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5221 | break; |
| 5222 | } |
Tao Ma | 3d56b8d | 2011-07-11 00:03:38 -0400 | [diff] [blame] | 5223 | |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 5224 | if (!ret) { |
| 5225 | ret = count; |
Tao Ma | 3d56b8d | 2011-07-11 00:03:38 -0400 | [diff] [blame] | 5226 | EXT4_MB_GRP_SET_TRIMMED(e4b.bd_info); |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 5227 | } |
Tao Ma | 3d56b8d | 2011-07-11 00:03:38 -0400 | [diff] [blame] | 5228 | out: |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5229 | ext4_unlock_group(sb, group); |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5230 | ext4_mb_unload_buddy(&e4b); |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5231 | |
| 5232 | ext4_debug("trimmed %d blocks in the group %d\n", |
| 5233 | count, group); |
| 5234 | |
Lukas Czerner | d71c1ae | 2012-11-08 14:04:52 -0500 | [diff] [blame] | 5235 | return ret; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5236 | } |
| 5237 | |
| 5238 | /** |
| 5239 | * ext4_trim_fs() -- trim ioctl handle function |
| 5240 | * @sb: superblock for filesystem |
| 5241 | * @range: fstrim_range structure |
| 5242 | * |
| 5243 | * start: First Byte to trim |
| 5244 | * len: number of Bytes to trim from start |
| 5245 | * minlen: minimum extent length in Bytes |
| 5246 | * ext4_trim_fs goes through all allocation groups containing Bytes from |
| 5247 | * start to start+len. For each such a group ext4_trim_all_free function |
| 5248 | * is invoked to trim all free space. |
| 5249 | */ |
| 5250 | int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range) |
| 5251 | { |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5252 | struct ext4_group_info *grp; |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5253 | ext4_group_t group, first_group, last_group; |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 5254 | ext4_grpblk_t cnt = 0, first_cluster, last_cluster; |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5255 | uint64_t start, end, minlen, trimmed = 0; |
Jan Kara | 0f0a25b | 2011-01-11 15:16:31 -0500 | [diff] [blame] | 5256 | ext4_fsblk_t first_data_blk = |
| 5257 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5258 | ext4_fsblk_t max_blks = ext4_blocks_count(EXT4_SB(sb)->s_es); |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5259 | int ret = 0; |
| 5260 | |
| 5261 | start = range->start >> sb->s_blocksize_bits; |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5262 | end = start + (range->len >> sb->s_blocksize_bits) - 1; |
Lukas Czerner | aaf7d73 | 2012-09-26 22:21:21 -0400 | [diff] [blame] | 5263 | minlen = EXT4_NUM_B2C(EXT4_SB(sb), |
| 5264 | range->minlen >> sb->s_blocksize_bits); |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5265 | |
Lukas Czerner | 5de35e8 | 2012-10-22 18:01:19 -0400 | [diff] [blame] | 5266 | if (minlen > EXT4_CLUSTERS_PER_GROUP(sb) || |
| 5267 | start >= max_blks || |
| 5268 | range->len < sb->s_blocksize) |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5269 | return -EINVAL; |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5270 | if (end >= max_blks) |
| 5271 | end = max_blks - 1; |
| 5272 | if (end <= first_data_blk) |
Tao Ma | 22f1045 | 2011-07-10 23:52:37 -0400 | [diff] [blame] | 5273 | goto out; |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5274 | if (start < first_data_blk) |
Jan Kara | 0f0a25b | 2011-01-11 15:16:31 -0500 | [diff] [blame] | 5275 | start = first_data_blk; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5276 | |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5277 | /* Determine first and last group to examine based on start and end */ |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5278 | ext4_get_group_no_and_offset(sb, (ext4_fsblk_t) start, |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 5279 | &first_group, &first_cluster); |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5280 | ext4_get_group_no_and_offset(sb, (ext4_fsblk_t) end, |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 5281 | &last_group, &last_cluster); |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5282 | |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5283 | /* end now represents the last cluster to discard in this group */ |
| 5284 | end = EXT4_CLUSTERS_PER_GROUP(sb) - 1; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5285 | |
| 5286 | for (group = first_group; group <= last_group; group++) { |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5287 | grp = ext4_get_group_info(sb, group); |
| 5288 | /* We only do this if the grp has never been initialized */ |
| 5289 | if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) { |
Konstantin Khlebnikov | adb7ef6 | 2016-03-13 17:29:06 -0400 | [diff] [blame] | 5290 | ret = ext4_mb_init_group(sb, group, GFP_NOFS); |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5291 | if (ret) |
| 5292 | break; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5293 | } |
| 5294 | |
Tao Ma | 0ba0851 | 2011-03-23 15:48:11 -0400 | [diff] [blame] | 5295 | /* |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5296 | * For all the groups except the last one, last cluster will |
| 5297 | * always be EXT4_CLUSTERS_PER_GROUP(sb)-1, so we only need to |
| 5298 | * change it for the last group, note that last_cluster is |
| 5299 | * already computed earlier by ext4_get_group_no_and_offset() |
Tao Ma | 0ba0851 | 2011-03-23 15:48:11 -0400 | [diff] [blame] | 5300 | */ |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5301 | if (group == last_group) |
| 5302 | end = last_cluster; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5303 | |
Lukas Czerner | 7894408 | 2011-05-24 18:16:27 -0400 | [diff] [blame] | 5304 | if (grp->bb_free >= minlen) { |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 5305 | cnt = ext4_trim_all_free(sb, group, first_cluster, |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5306 | end, minlen); |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5307 | if (cnt < 0) { |
| 5308 | ret = cnt; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5309 | break; |
| 5310 | } |
Lukas Czerner | 21e7fd2 | 2012-03-21 21:24:22 -0400 | [diff] [blame] | 5311 | trimmed += cnt; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5312 | } |
Lukas Czerner | 913eed83 | 2012-03-21 21:22:22 -0400 | [diff] [blame] | 5313 | |
| 5314 | /* |
| 5315 | * For every group except the first one, we are sure |
| 5316 | * that the first cluster to discard will be cluster #0. |
| 5317 | */ |
Theodore Ts'o | 7137d7a | 2011-09-09 18:38:51 -0400 | [diff] [blame] | 5318 | first_cluster = 0; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5319 | } |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5320 | |
Tao Ma | 3d56b8d | 2011-07-11 00:03:38 -0400 | [diff] [blame] | 5321 | if (!ret) |
| 5322 | atomic_set(&EXT4_SB(sb)->s_last_trim_minblks, minlen); |
| 5323 | |
Tao Ma | 22f1045 | 2011-07-10 23:52:37 -0400 | [diff] [blame] | 5324 | out: |
Lukas Czerner | aaf7d73 | 2012-09-26 22:21:21 -0400 | [diff] [blame] | 5325 | range->len = EXT4_C2B(EXT4_SB(sb), trimmed) << sb->s_blocksize_bits; |
Lukas Czerner | 7360d17 | 2010-10-27 21:30:12 -0400 | [diff] [blame] | 5326 | return ret; |
| 5327 | } |
Darrick J. Wong | 0c9ec4b | 2017-04-30 00:36:53 -0400 | [diff] [blame] | 5328 | |
| 5329 | /* Iterate all the free extents in the group. */ |
| 5330 | int |
| 5331 | ext4_mballoc_query_range( |
| 5332 | struct super_block *sb, |
| 5333 | ext4_group_t group, |
| 5334 | ext4_grpblk_t start, |
| 5335 | ext4_grpblk_t end, |
| 5336 | ext4_mballoc_query_range_fn formatter, |
| 5337 | void *priv) |
| 5338 | { |
| 5339 | void *bitmap; |
| 5340 | ext4_grpblk_t next; |
| 5341 | struct ext4_buddy e4b; |
| 5342 | int error; |
| 5343 | |
| 5344 | error = ext4_mb_load_buddy(sb, group, &e4b); |
| 5345 | if (error) |
| 5346 | return error; |
| 5347 | bitmap = e4b.bd_bitmap; |
| 5348 | |
| 5349 | ext4_lock_group(sb, group); |
| 5350 | |
| 5351 | start = (e4b.bd_info->bb_first_free > start) ? |
| 5352 | e4b.bd_info->bb_first_free : start; |
| 5353 | if (end >= EXT4_CLUSTERS_PER_GROUP(sb)) |
| 5354 | end = EXT4_CLUSTERS_PER_GROUP(sb) - 1; |
| 5355 | |
| 5356 | while (start <= end) { |
| 5357 | start = mb_find_next_zero_bit(bitmap, end + 1, start); |
| 5358 | if (start > end) |
| 5359 | break; |
| 5360 | next = mb_find_next_bit(bitmap, end + 1, start); |
| 5361 | |
| 5362 | ext4_unlock_group(sb, group); |
| 5363 | error = formatter(sb, group, start, next - start, priv); |
| 5364 | if (error) |
| 5365 | goto out_unload; |
| 5366 | ext4_lock_group(sb, group); |
| 5367 | |
| 5368 | start = next + 1; |
| 5369 | } |
| 5370 | |
| 5371 | ext4_unlock_group(sb, group); |
| 5372 | out_unload: |
| 5373 | ext4_mb_unload_buddy(&e4b); |
| 5374 | |
| 5375 | return error; |
| 5376 | } |