Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1 | /* |
| 2 | * segment.c - NILFS segment constructor. |
| 3 | * |
| 4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | * |
| 20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <linux/pagemap.h> |
| 25 | #include <linux/buffer_head.h> |
| 26 | #include <linux/writeback.h> |
| 27 | #include <linux/bio.h> |
| 28 | #include <linux/completion.h> |
| 29 | #include <linux/blkdev.h> |
| 30 | #include <linux/backing-dev.h> |
| 31 | #include <linux/freezer.h> |
| 32 | #include <linux/kthread.h> |
| 33 | #include <linux/crc32.h> |
| 34 | #include <linux/pagevec.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 35 | #include <linux/slab.h> |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 36 | #include "nilfs.h" |
| 37 | #include "btnode.h" |
| 38 | #include "page.h" |
| 39 | #include "segment.h" |
| 40 | #include "sufile.h" |
| 41 | #include "cpfile.h" |
| 42 | #include "ifile.h" |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 43 | #include "segbuf.h" |
| 44 | |
| 45 | |
| 46 | /* |
| 47 | * Segment constructor |
| 48 | */ |
| 49 | #define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */ |
| 50 | |
| 51 | #define SC_MAX_SEGDELTA 64 /* Upper limit of the number of segments |
| 52 | appended in collection retry loop */ |
| 53 | |
| 54 | /* Construction mode */ |
| 55 | enum { |
| 56 | SC_LSEG_SR = 1, /* Make a logical segment having a super root */ |
| 57 | SC_LSEG_DSYNC, /* Flush data blocks of a given file and make |
| 58 | a logical segment without a super root */ |
| 59 | SC_FLUSH_FILE, /* Flush data files, leads to segment writes without |
| 60 | creating a checkpoint */ |
| 61 | SC_FLUSH_DAT, /* Flush DAT file. This also creates segments without |
| 62 | a checkpoint */ |
| 63 | }; |
| 64 | |
| 65 | /* Stage numbers of dirty block collection */ |
| 66 | enum { |
| 67 | NILFS_ST_INIT = 0, |
| 68 | NILFS_ST_GC, /* Collecting dirty blocks for GC */ |
| 69 | NILFS_ST_FILE, |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 70 | NILFS_ST_IFILE, |
| 71 | NILFS_ST_CPFILE, |
| 72 | NILFS_ST_SUFILE, |
| 73 | NILFS_ST_DAT, |
| 74 | NILFS_ST_SR, /* Super root */ |
| 75 | NILFS_ST_DSYNC, /* Data sync blocks */ |
| 76 | NILFS_ST_DONE, |
| 77 | }; |
| 78 | |
| 79 | /* State flags of collection */ |
| 80 | #define NILFS_CF_NODE 0x0001 /* Collecting node blocks */ |
| 81 | #define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */ |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 82 | #define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */ |
| 83 | #define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 84 | |
| 85 | /* Operations depending on the construction mode and file type */ |
| 86 | struct nilfs_sc_operations { |
| 87 | int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *, |
| 88 | struct inode *); |
| 89 | int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *, |
| 90 | struct inode *); |
| 91 | int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *, |
| 92 | struct inode *); |
| 93 | void (*write_data_binfo)(struct nilfs_sc_info *, |
| 94 | struct nilfs_segsum_pointer *, |
| 95 | union nilfs_binfo *); |
| 96 | void (*write_node_binfo)(struct nilfs_sc_info *, |
| 97 | struct nilfs_segsum_pointer *, |
| 98 | union nilfs_binfo *); |
| 99 | }; |
| 100 | |
| 101 | /* |
| 102 | * Other definitions |
| 103 | */ |
| 104 | static void nilfs_segctor_start_timer(struct nilfs_sc_info *); |
| 105 | static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int); |
| 106 | static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *); |
| 107 | static void nilfs_dispose_list(struct nilfs_sb_info *, struct list_head *, |
| 108 | int); |
| 109 | |
| 110 | #define nilfs_cnt32_gt(a, b) \ |
| 111 | (typecheck(__u32, a) && typecheck(__u32, b) && \ |
| 112 | ((__s32)(b) - (__s32)(a) < 0)) |
| 113 | #define nilfs_cnt32_ge(a, b) \ |
| 114 | (typecheck(__u32, a) && typecheck(__u32, b) && \ |
| 115 | ((__s32)(a) - (__s32)(b) >= 0)) |
| 116 | #define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a) |
| 117 | #define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a) |
| 118 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 119 | static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti) |
| 120 | { |
| 121 | struct nilfs_transaction_info *cur_ti = current->journal_info; |
| 122 | void *save = NULL; |
| 123 | |
| 124 | if (cur_ti) { |
| 125 | if (cur_ti->ti_magic == NILFS_TI_MAGIC) |
| 126 | return ++cur_ti->ti_count; |
| 127 | else { |
| 128 | /* |
| 129 | * If journal_info field is occupied by other FS, |
Ryusuke Konishi | 47420c7 | 2009-04-06 19:01:45 -0700 | [diff] [blame] | 130 | * it is saved and will be restored on |
| 131 | * nilfs_transaction_commit(). |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 132 | */ |
| 133 | printk(KERN_WARNING |
| 134 | "NILFS warning: journal info from a different " |
| 135 | "FS\n"); |
| 136 | save = current->journal_info; |
| 137 | } |
| 138 | } |
| 139 | if (!ti) { |
| 140 | ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS); |
| 141 | if (!ti) |
| 142 | return -ENOMEM; |
| 143 | ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC; |
| 144 | } else { |
| 145 | ti->ti_flags = 0; |
| 146 | } |
| 147 | ti->ti_count = 0; |
| 148 | ti->ti_save = save; |
| 149 | ti->ti_magic = NILFS_TI_MAGIC; |
| 150 | current->journal_info = ti; |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * nilfs_transaction_begin - start indivisible file operations. |
| 156 | * @sb: super block |
| 157 | * @ti: nilfs_transaction_info |
| 158 | * @vacancy_check: flags for vacancy rate checks |
| 159 | * |
| 160 | * nilfs_transaction_begin() acquires a reader/writer semaphore, called |
| 161 | * the segment semaphore, to make a segment construction and write tasks |
Ryusuke Konishi | 47420c7 | 2009-04-06 19:01:45 -0700 | [diff] [blame] | 162 | * exclusive. The function is used with nilfs_transaction_commit() in pairs. |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 163 | * The region enclosed by these two functions can be nested. To avoid a |
| 164 | * deadlock, the semaphore is only acquired or released in the outermost call. |
| 165 | * |
| 166 | * This function allocates a nilfs_transaction_info struct to keep context |
| 167 | * information on it. It is initialized and hooked onto the current task in |
| 168 | * the outermost call. If a pre-allocated struct is given to @ti, it is used |
Ryusuke Konishi | 7a65004 | 2010-03-14 03:32:40 +0900 | [diff] [blame] | 169 | * instead; otherwise a new struct is assigned from a slab. |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 170 | * |
| 171 | * When @vacancy_check flag is set, this function will check the amount of |
| 172 | * free space, and will wait for the GC to reclaim disk space if low capacity. |
| 173 | * |
| 174 | * Return Value: On success, 0 is returned. On error, one of the following |
| 175 | * negative error code is returned. |
| 176 | * |
| 177 | * %-ENOMEM - Insufficient memory available. |
| 178 | * |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 179 | * %-ENOSPC - No space left on device |
| 180 | */ |
| 181 | int nilfs_transaction_begin(struct super_block *sb, |
| 182 | struct nilfs_transaction_info *ti, |
| 183 | int vacancy_check) |
| 184 | { |
| 185 | struct nilfs_sb_info *sbi; |
| 186 | struct the_nilfs *nilfs; |
| 187 | int ret = nilfs_prepare_segment_lock(ti); |
| 188 | |
| 189 | if (unlikely(ret < 0)) |
| 190 | return ret; |
| 191 | if (ret > 0) |
| 192 | return 0; |
| 193 | |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 194 | vfs_check_frozen(sb, SB_FREEZE_WRITE); |
| 195 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 196 | sbi = NILFS_SB(sb); |
| 197 | nilfs = sbi->s_nilfs; |
| 198 | down_read(&nilfs->ns_segctor_sem); |
| 199 | if (vacancy_check && nilfs_near_disk_full(nilfs)) { |
| 200 | up_read(&nilfs->ns_segctor_sem); |
| 201 | ret = -ENOSPC; |
| 202 | goto failed; |
| 203 | } |
| 204 | return 0; |
| 205 | |
| 206 | failed: |
| 207 | ti = current->journal_info; |
| 208 | current->journal_info = ti->ti_save; |
| 209 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) |
| 210 | kmem_cache_free(nilfs_transaction_cachep, ti); |
| 211 | return ret; |
| 212 | } |
| 213 | |
| 214 | /** |
Ryusuke Konishi | 47420c7 | 2009-04-06 19:01:45 -0700 | [diff] [blame] | 215 | * nilfs_transaction_commit - commit indivisible file operations. |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 216 | * @sb: super block |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 217 | * |
Ryusuke Konishi | 47420c7 | 2009-04-06 19:01:45 -0700 | [diff] [blame] | 218 | * nilfs_transaction_commit() releases the read semaphore which is |
| 219 | * acquired by nilfs_transaction_begin(). This is only performed |
| 220 | * in outermost call of this function. If a commit flag is set, |
| 221 | * nilfs_transaction_commit() sets a timer to start the segment |
| 222 | * constructor. If a sync flag is set, it starts construction |
| 223 | * directly. |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 224 | */ |
Ryusuke Konishi | 47420c7 | 2009-04-06 19:01:45 -0700 | [diff] [blame] | 225 | int nilfs_transaction_commit(struct super_block *sb) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 226 | { |
| 227 | struct nilfs_transaction_info *ti = current->journal_info; |
| 228 | struct nilfs_sb_info *sbi; |
| 229 | struct nilfs_sc_info *sci; |
| 230 | int err = 0; |
| 231 | |
| 232 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); |
Ryusuke Konishi | 47420c7 | 2009-04-06 19:01:45 -0700 | [diff] [blame] | 233 | ti->ti_flags |= NILFS_TI_COMMIT; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 234 | if (ti->ti_count > 0) { |
| 235 | ti->ti_count--; |
| 236 | return 0; |
| 237 | } |
| 238 | sbi = NILFS_SB(sb); |
| 239 | sci = NILFS_SC(sbi); |
| 240 | if (sci != NULL) { |
| 241 | if (ti->ti_flags & NILFS_TI_COMMIT) |
| 242 | nilfs_segctor_start_timer(sci); |
| 243 | if (atomic_read(&sbi->s_nilfs->ns_ndirtyblks) > |
| 244 | sci->sc_watermark) |
| 245 | nilfs_segctor_do_flush(sci, 0); |
| 246 | } |
| 247 | up_read(&sbi->s_nilfs->ns_segctor_sem); |
| 248 | current->journal_info = ti->ti_save; |
| 249 | |
| 250 | if (ti->ti_flags & NILFS_TI_SYNC) |
| 251 | err = nilfs_construct_segment(sb); |
| 252 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) |
| 253 | kmem_cache_free(nilfs_transaction_cachep, ti); |
| 254 | return err; |
| 255 | } |
| 256 | |
Ryusuke Konishi | 47420c7 | 2009-04-06 19:01:45 -0700 | [diff] [blame] | 257 | void nilfs_transaction_abort(struct super_block *sb) |
| 258 | { |
| 259 | struct nilfs_transaction_info *ti = current->journal_info; |
| 260 | |
| 261 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); |
| 262 | if (ti->ti_count > 0) { |
| 263 | ti->ti_count--; |
| 264 | return; |
| 265 | } |
| 266 | up_read(&NILFS_SB(sb)->s_nilfs->ns_segctor_sem); |
| 267 | |
| 268 | current->journal_info = ti->ti_save; |
| 269 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) |
| 270 | kmem_cache_free(nilfs_transaction_cachep, ti); |
| 271 | } |
| 272 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 273 | void nilfs_relax_pressure_in_lock(struct super_block *sb) |
| 274 | { |
| 275 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 276 | struct nilfs_sc_info *sci = NILFS_SC(sbi); |
| 277 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 278 | |
| 279 | if (!sci || !sci->sc_flush_request) |
| 280 | return; |
| 281 | |
| 282 | set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags); |
| 283 | up_read(&nilfs->ns_segctor_sem); |
| 284 | |
| 285 | down_write(&nilfs->ns_segctor_sem); |
| 286 | if (sci->sc_flush_request && |
| 287 | test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) { |
| 288 | struct nilfs_transaction_info *ti = current->journal_info; |
| 289 | |
| 290 | ti->ti_flags |= NILFS_TI_WRITER; |
| 291 | nilfs_segctor_do_immediate_flush(sci); |
| 292 | ti->ti_flags &= ~NILFS_TI_WRITER; |
| 293 | } |
| 294 | downgrade_write(&nilfs->ns_segctor_sem); |
| 295 | } |
| 296 | |
| 297 | static void nilfs_transaction_lock(struct nilfs_sb_info *sbi, |
| 298 | struct nilfs_transaction_info *ti, |
| 299 | int gcflag) |
| 300 | { |
| 301 | struct nilfs_transaction_info *cur_ti = current->journal_info; |
| 302 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 303 | WARN_ON(cur_ti); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 304 | ti->ti_flags = NILFS_TI_WRITER; |
| 305 | ti->ti_count = 0; |
| 306 | ti->ti_save = cur_ti; |
| 307 | ti->ti_magic = NILFS_TI_MAGIC; |
| 308 | INIT_LIST_HEAD(&ti->ti_garbage); |
| 309 | current->journal_info = ti; |
| 310 | |
| 311 | for (;;) { |
| 312 | down_write(&sbi->s_nilfs->ns_segctor_sem); |
| 313 | if (!test_bit(NILFS_SC_PRIOR_FLUSH, &NILFS_SC(sbi)->sc_flags)) |
| 314 | break; |
| 315 | |
| 316 | nilfs_segctor_do_immediate_flush(NILFS_SC(sbi)); |
| 317 | |
| 318 | up_write(&sbi->s_nilfs->ns_segctor_sem); |
| 319 | yield(); |
| 320 | } |
| 321 | if (gcflag) |
| 322 | ti->ti_flags |= NILFS_TI_GC; |
| 323 | } |
| 324 | |
| 325 | static void nilfs_transaction_unlock(struct nilfs_sb_info *sbi) |
| 326 | { |
| 327 | struct nilfs_transaction_info *ti = current->journal_info; |
| 328 | |
| 329 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); |
| 330 | BUG_ON(ti->ti_count > 0); |
| 331 | |
| 332 | up_write(&sbi->s_nilfs->ns_segctor_sem); |
| 333 | current->journal_info = ti->ti_save; |
| 334 | if (!list_empty(&ti->ti_garbage)) |
| 335 | nilfs_dispose_list(sbi, &ti->ti_garbage, 0); |
| 336 | } |
| 337 | |
| 338 | static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci, |
| 339 | struct nilfs_segsum_pointer *ssp, |
| 340 | unsigned bytes) |
| 341 | { |
| 342 | struct nilfs_segment_buffer *segbuf = sci->sc_curseg; |
| 343 | unsigned blocksize = sci->sc_super->s_blocksize; |
| 344 | void *p; |
| 345 | |
| 346 | if (unlikely(ssp->offset + bytes > blocksize)) { |
| 347 | ssp->offset = 0; |
| 348 | BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh, |
| 349 | &segbuf->sb_segsum_buffers)); |
| 350 | ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh); |
| 351 | } |
| 352 | p = ssp->bh->b_data + ssp->offset; |
| 353 | ssp->offset += bytes; |
| 354 | return p; |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * nilfs_segctor_reset_segment_buffer - reset the current segment buffer |
| 359 | * @sci: nilfs_sc_info |
| 360 | */ |
| 361 | static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci) |
| 362 | { |
| 363 | struct nilfs_segment_buffer *segbuf = sci->sc_curseg; |
| 364 | struct buffer_head *sumbh; |
| 365 | unsigned sumbytes; |
| 366 | unsigned flags = 0; |
| 367 | int err; |
| 368 | |
| 369 | if (nilfs_doing_gc()) |
| 370 | flags = NILFS_SS_GC; |
Ryusuke Konishi | 6c43f41 | 2010-08-20 20:10:38 +0900 | [diff] [blame] | 371 | err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 372 | if (unlikely(err)) |
| 373 | return err; |
| 374 | |
| 375 | sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers); |
| 376 | sumbytes = segbuf->sb_sum.sumbytes; |
| 377 | sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes; |
| 378 | sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes; |
| 379 | sci->sc_blk_cnt = sci->sc_datablk_cnt = 0; |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci) |
| 384 | { |
| 385 | sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks; |
| 386 | if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs)) |
| 387 | return -E2BIG; /* The current segment is filled up |
| 388 | (internal code) */ |
| 389 | sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg); |
| 390 | return nilfs_segctor_reset_segment_buffer(sci); |
| 391 | } |
| 392 | |
| 393 | static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci) |
| 394 | { |
| 395 | struct nilfs_segment_buffer *segbuf = sci->sc_curseg; |
| 396 | int err; |
| 397 | |
| 398 | if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) { |
| 399 | err = nilfs_segctor_feed_segment(sci); |
| 400 | if (err) |
| 401 | return err; |
| 402 | segbuf = sci->sc_curseg; |
| 403 | } |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 404 | err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 405 | if (likely(!err)) |
| 406 | segbuf->sb_sum.flags |= NILFS_SS_SR; |
| 407 | return err; |
| 408 | } |
| 409 | |
| 410 | /* |
| 411 | * Functions for making segment summary and payloads |
| 412 | */ |
| 413 | static int nilfs_segctor_segsum_block_required( |
| 414 | struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp, |
| 415 | unsigned binfo_size) |
| 416 | { |
| 417 | unsigned blocksize = sci->sc_super->s_blocksize; |
| 418 | /* Size of finfo and binfo is enough small against blocksize */ |
| 419 | |
| 420 | return ssp->offset + binfo_size + |
| 421 | (!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) > |
| 422 | blocksize; |
| 423 | } |
| 424 | |
| 425 | static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci, |
| 426 | struct inode *inode) |
| 427 | { |
| 428 | sci->sc_curseg->sb_sum.nfinfo++; |
| 429 | sci->sc_binfo_ptr = sci->sc_finfo_ptr; |
| 430 | nilfs_segctor_map_segsum_entry( |
| 431 | sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo)); |
Ryusuke Konishi | c96fa46 | 2009-04-06 19:01:57 -0700 | [diff] [blame] | 432 | |
| 433 | if (inode->i_sb && !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags)) |
| 434 | set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 435 | /* skip finfo */ |
| 436 | } |
| 437 | |
| 438 | static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci, |
| 439 | struct inode *inode) |
| 440 | { |
| 441 | struct nilfs_finfo *finfo; |
| 442 | struct nilfs_inode_info *ii; |
| 443 | struct nilfs_segment_buffer *segbuf; |
Ryusuke Konishi | 6c43f41 | 2010-08-20 20:10:38 +0900 | [diff] [blame] | 444 | __u64 cno; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 445 | |
| 446 | if (sci->sc_blk_cnt == 0) |
| 447 | return; |
| 448 | |
| 449 | ii = NILFS_I(inode); |
Ryusuke Konishi | 6c43f41 | 2010-08-20 20:10:38 +0900 | [diff] [blame] | 450 | |
| 451 | if (test_bit(NILFS_I_GCINODE, &ii->i_state)) |
| 452 | cno = ii->i_cno; |
| 453 | else if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) |
| 454 | cno = 0; |
| 455 | else |
| 456 | cno = sci->sc_cno; |
| 457 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 458 | finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr, |
| 459 | sizeof(*finfo)); |
| 460 | finfo->fi_ino = cpu_to_le64(inode->i_ino); |
| 461 | finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt); |
| 462 | finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt); |
Ryusuke Konishi | 6c43f41 | 2010-08-20 20:10:38 +0900 | [diff] [blame] | 463 | finfo->fi_cno = cpu_to_le64(cno); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 464 | |
| 465 | segbuf = sci->sc_curseg; |
| 466 | segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset + |
| 467 | sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1); |
| 468 | sci->sc_finfo_ptr = sci->sc_binfo_ptr; |
| 469 | sci->sc_blk_cnt = sci->sc_datablk_cnt = 0; |
| 470 | } |
| 471 | |
| 472 | static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci, |
| 473 | struct buffer_head *bh, |
| 474 | struct inode *inode, |
| 475 | unsigned binfo_size) |
| 476 | { |
| 477 | struct nilfs_segment_buffer *segbuf; |
| 478 | int required, err = 0; |
| 479 | |
| 480 | retry: |
| 481 | segbuf = sci->sc_curseg; |
| 482 | required = nilfs_segctor_segsum_block_required( |
| 483 | sci, &sci->sc_binfo_ptr, binfo_size); |
| 484 | if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) { |
| 485 | nilfs_segctor_end_finfo(sci, inode); |
| 486 | err = nilfs_segctor_feed_segment(sci); |
| 487 | if (err) |
| 488 | return err; |
| 489 | goto retry; |
| 490 | } |
| 491 | if (unlikely(required)) { |
| 492 | err = nilfs_segbuf_extend_segsum(segbuf); |
| 493 | if (unlikely(err)) |
| 494 | goto failed; |
| 495 | } |
| 496 | if (sci->sc_blk_cnt == 0) |
| 497 | nilfs_segctor_begin_finfo(sci, inode); |
| 498 | |
| 499 | nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size); |
| 500 | /* Substitution to vblocknr is delayed until update_blocknr() */ |
| 501 | nilfs_segbuf_add_file_buffer(segbuf, bh); |
| 502 | sci->sc_blk_cnt++; |
| 503 | failed: |
| 504 | return err; |
| 505 | } |
| 506 | |
| 507 | static int nilfs_handle_bmap_error(int err, const char *fname, |
| 508 | struct inode *inode, struct super_block *sb) |
| 509 | { |
| 510 | if (err == -EINVAL) { |
| 511 | nilfs_error(sb, fname, "broken bmap (inode=%lu)\n", |
| 512 | inode->i_ino); |
| 513 | err = -EIO; |
| 514 | } |
| 515 | return err; |
| 516 | } |
| 517 | |
| 518 | /* |
| 519 | * Callback functions that enumerate, mark, and collect dirty blocks |
| 520 | */ |
| 521 | static int nilfs_collect_file_data(struct nilfs_sc_info *sci, |
| 522 | struct buffer_head *bh, struct inode *inode) |
| 523 | { |
| 524 | int err; |
| 525 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 526 | err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
| 527 | if (unlikely(err < 0)) |
| 528 | return nilfs_handle_bmap_error(err, __func__, inode, |
| 529 | sci->sc_super); |
| 530 | |
| 531 | err = nilfs_segctor_add_file_block(sci, bh, inode, |
| 532 | sizeof(struct nilfs_binfo_v)); |
| 533 | if (!err) |
| 534 | sci->sc_datablk_cnt++; |
| 535 | return err; |
| 536 | } |
| 537 | |
| 538 | static int nilfs_collect_file_node(struct nilfs_sc_info *sci, |
| 539 | struct buffer_head *bh, |
| 540 | struct inode *inode) |
| 541 | { |
| 542 | int err; |
| 543 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 544 | err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
| 545 | if (unlikely(err < 0)) |
| 546 | return nilfs_handle_bmap_error(err, __func__, inode, |
| 547 | sci->sc_super); |
| 548 | return 0; |
| 549 | } |
| 550 | |
| 551 | static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci, |
| 552 | struct buffer_head *bh, |
| 553 | struct inode *inode) |
| 554 | { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 555 | WARN_ON(!buffer_dirty(bh)); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 556 | return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64)); |
| 557 | } |
| 558 | |
| 559 | static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci, |
| 560 | struct nilfs_segsum_pointer *ssp, |
| 561 | union nilfs_binfo *binfo) |
| 562 | { |
| 563 | struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry( |
| 564 | sci, ssp, sizeof(*binfo_v)); |
| 565 | *binfo_v = binfo->bi_v; |
| 566 | } |
| 567 | |
| 568 | static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci, |
| 569 | struct nilfs_segsum_pointer *ssp, |
| 570 | union nilfs_binfo *binfo) |
| 571 | { |
| 572 | __le64 *vblocknr = nilfs_segctor_map_segsum_entry( |
| 573 | sci, ssp, sizeof(*vblocknr)); |
| 574 | *vblocknr = binfo->bi_v.bi_vblocknr; |
| 575 | } |
| 576 | |
Ryusuke Konishi | 4e81950 | 2010-04-23 17:35:23 +0900 | [diff] [blame] | 577 | static struct nilfs_sc_operations nilfs_sc_file_ops = { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 578 | .collect_data = nilfs_collect_file_data, |
| 579 | .collect_node = nilfs_collect_file_node, |
| 580 | .collect_bmap = nilfs_collect_file_bmap, |
| 581 | .write_data_binfo = nilfs_write_file_data_binfo, |
| 582 | .write_node_binfo = nilfs_write_file_node_binfo, |
| 583 | }; |
| 584 | |
| 585 | static int nilfs_collect_dat_data(struct nilfs_sc_info *sci, |
| 586 | struct buffer_head *bh, struct inode *inode) |
| 587 | { |
| 588 | int err; |
| 589 | |
| 590 | err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
| 591 | if (unlikely(err < 0)) |
| 592 | return nilfs_handle_bmap_error(err, __func__, inode, |
| 593 | sci->sc_super); |
| 594 | |
| 595 | err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64)); |
| 596 | if (!err) |
| 597 | sci->sc_datablk_cnt++; |
| 598 | return err; |
| 599 | } |
| 600 | |
| 601 | static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci, |
| 602 | struct buffer_head *bh, struct inode *inode) |
| 603 | { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 604 | WARN_ON(!buffer_dirty(bh)); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 605 | return nilfs_segctor_add_file_block(sci, bh, inode, |
| 606 | sizeof(struct nilfs_binfo_dat)); |
| 607 | } |
| 608 | |
| 609 | static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci, |
| 610 | struct nilfs_segsum_pointer *ssp, |
| 611 | union nilfs_binfo *binfo) |
| 612 | { |
| 613 | __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp, |
| 614 | sizeof(*blkoff)); |
| 615 | *blkoff = binfo->bi_dat.bi_blkoff; |
| 616 | } |
| 617 | |
| 618 | static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci, |
| 619 | struct nilfs_segsum_pointer *ssp, |
| 620 | union nilfs_binfo *binfo) |
| 621 | { |
| 622 | struct nilfs_binfo_dat *binfo_dat = |
| 623 | nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat)); |
| 624 | *binfo_dat = binfo->bi_dat; |
| 625 | } |
| 626 | |
Ryusuke Konishi | 4e81950 | 2010-04-23 17:35:23 +0900 | [diff] [blame] | 627 | static struct nilfs_sc_operations nilfs_sc_dat_ops = { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 628 | .collect_data = nilfs_collect_dat_data, |
| 629 | .collect_node = nilfs_collect_file_node, |
| 630 | .collect_bmap = nilfs_collect_dat_bmap, |
| 631 | .write_data_binfo = nilfs_write_dat_data_binfo, |
| 632 | .write_node_binfo = nilfs_write_dat_node_binfo, |
| 633 | }; |
| 634 | |
Ryusuke Konishi | 4e81950 | 2010-04-23 17:35:23 +0900 | [diff] [blame] | 635 | static struct nilfs_sc_operations nilfs_sc_dsync_ops = { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 636 | .collect_data = nilfs_collect_file_data, |
| 637 | .collect_node = NULL, |
| 638 | .collect_bmap = NULL, |
| 639 | .write_data_binfo = nilfs_write_file_data_binfo, |
| 640 | .write_node_binfo = NULL, |
| 641 | }; |
| 642 | |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 643 | static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode, |
| 644 | struct list_head *listp, |
| 645 | size_t nlimit, |
| 646 | loff_t start, loff_t end) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 647 | { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 648 | struct address_space *mapping = inode->i_mapping; |
| 649 | struct pagevec pvec; |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 650 | pgoff_t index = 0, last = ULONG_MAX; |
| 651 | size_t ndirties = 0; |
| 652 | int i; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 653 | |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 654 | if (unlikely(start != 0 || end != LLONG_MAX)) { |
| 655 | /* |
| 656 | * A valid range is given for sync-ing data pages. The |
| 657 | * range is rounded to per-page; extra dirty buffers |
| 658 | * may be included if blocksize < pagesize. |
| 659 | */ |
| 660 | index = start >> PAGE_SHIFT; |
| 661 | last = end >> PAGE_SHIFT; |
| 662 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 663 | pagevec_init(&pvec, 0); |
| 664 | repeat: |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 665 | if (unlikely(index > last) || |
| 666 | !pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY, |
| 667 | min_t(pgoff_t, last - index, |
| 668 | PAGEVEC_SIZE - 1) + 1)) |
| 669 | return ndirties; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 670 | |
| 671 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 672 | struct buffer_head *bh, *head; |
| 673 | struct page *page = pvec.pages[i]; |
| 674 | |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 675 | if (unlikely(page->index > last)) |
| 676 | break; |
| 677 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 678 | if (mapping->host) { |
| 679 | lock_page(page); |
| 680 | if (!page_has_buffers(page)) |
| 681 | create_empty_buffers(page, |
| 682 | 1 << inode->i_blkbits, 0); |
| 683 | unlock_page(page); |
| 684 | } |
| 685 | |
| 686 | bh = head = page_buffers(page); |
| 687 | do { |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 688 | if (!buffer_dirty(bh)) |
| 689 | continue; |
| 690 | get_bh(bh); |
| 691 | list_add_tail(&bh->b_assoc_buffers, listp); |
| 692 | ndirties++; |
| 693 | if (unlikely(ndirties >= nlimit)) { |
| 694 | pagevec_release(&pvec); |
| 695 | cond_resched(); |
| 696 | return ndirties; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 697 | } |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 698 | } while (bh = bh->b_this_page, bh != head); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 699 | } |
| 700 | pagevec_release(&pvec); |
| 701 | cond_resched(); |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 702 | goto repeat; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | static void nilfs_lookup_dirty_node_buffers(struct inode *inode, |
| 706 | struct list_head *listp) |
| 707 | { |
| 708 | struct nilfs_inode_info *ii = NILFS_I(inode); |
| 709 | struct address_space *mapping = &ii->i_btnode_cache; |
| 710 | struct pagevec pvec; |
| 711 | struct buffer_head *bh, *head; |
| 712 | unsigned int i; |
| 713 | pgoff_t index = 0; |
| 714 | |
| 715 | pagevec_init(&pvec, 0); |
| 716 | |
| 717 | while (pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY, |
| 718 | PAGEVEC_SIZE)) { |
| 719 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 720 | bh = head = page_buffers(pvec.pages[i]); |
| 721 | do { |
| 722 | if (buffer_dirty(bh)) { |
| 723 | get_bh(bh); |
| 724 | list_add_tail(&bh->b_assoc_buffers, |
| 725 | listp); |
| 726 | } |
| 727 | bh = bh->b_this_page; |
| 728 | } while (bh != head); |
| 729 | } |
| 730 | pagevec_release(&pvec); |
| 731 | cond_resched(); |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | static void nilfs_dispose_list(struct nilfs_sb_info *sbi, |
| 736 | struct list_head *head, int force) |
| 737 | { |
| 738 | struct nilfs_inode_info *ii, *n; |
| 739 | struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii; |
| 740 | unsigned nv = 0; |
| 741 | |
| 742 | while (!list_empty(head)) { |
| 743 | spin_lock(&sbi->s_inode_lock); |
| 744 | list_for_each_entry_safe(ii, n, head, i_dirty) { |
| 745 | list_del_init(&ii->i_dirty); |
| 746 | if (force) { |
| 747 | if (unlikely(ii->i_bh)) { |
| 748 | brelse(ii->i_bh); |
| 749 | ii->i_bh = NULL; |
| 750 | } |
| 751 | } else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) { |
| 752 | set_bit(NILFS_I_QUEUED, &ii->i_state); |
| 753 | list_add_tail(&ii->i_dirty, |
| 754 | &sbi->s_dirty_files); |
| 755 | continue; |
| 756 | } |
| 757 | ivec[nv++] = ii; |
| 758 | if (nv == SC_N_INODEVEC) |
| 759 | break; |
| 760 | } |
| 761 | spin_unlock(&sbi->s_inode_lock); |
| 762 | |
| 763 | for (pii = ivec; nv > 0; pii++, nv--) |
| 764 | iput(&(*pii)->vfs_inode); |
| 765 | } |
| 766 | } |
| 767 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 768 | static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs, |
| 769 | struct nilfs_root *root) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 770 | { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 771 | int ret = 0; |
| 772 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 773 | if (nilfs_mdt_fetch_dirty(root->ifile)) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 774 | ret++; |
| 775 | if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile)) |
| 776 | ret++; |
| 777 | if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile)) |
| 778 | ret++; |
| 779 | if (ret || nilfs_doing_gc()) |
| 780 | if (nilfs_mdt_fetch_dirty(nilfs_dat_inode(nilfs))) |
| 781 | ret++; |
| 782 | return ret; |
| 783 | } |
| 784 | |
| 785 | static int nilfs_segctor_clean(struct nilfs_sc_info *sci) |
| 786 | { |
| 787 | return list_empty(&sci->sc_dirty_files) && |
| 788 | !test_bit(NILFS_SC_DIRTY, &sci->sc_flags) && |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 789 | sci->sc_nfreesegs == 0 && |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 790 | (!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes)); |
| 791 | } |
| 792 | |
| 793 | static int nilfs_segctor_confirm(struct nilfs_sc_info *sci) |
| 794 | { |
| 795 | struct nilfs_sb_info *sbi = sci->sc_sbi; |
| 796 | int ret = 0; |
| 797 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 798 | if (nilfs_test_metadata_dirty(sbi->s_nilfs, sci->sc_root)) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 799 | set_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
| 800 | |
| 801 | spin_lock(&sbi->s_inode_lock); |
| 802 | if (list_empty(&sbi->s_dirty_files) && nilfs_segctor_clean(sci)) |
| 803 | ret++; |
| 804 | |
| 805 | spin_unlock(&sbi->s_inode_lock); |
| 806 | return ret; |
| 807 | } |
| 808 | |
| 809 | static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci) |
| 810 | { |
| 811 | struct nilfs_sb_info *sbi = sci->sc_sbi; |
| 812 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 813 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 814 | nilfs_mdt_clear_dirty(sci->sc_root->ifile); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 815 | nilfs_mdt_clear_dirty(nilfs->ns_cpfile); |
| 816 | nilfs_mdt_clear_dirty(nilfs->ns_sufile); |
| 817 | nilfs_mdt_clear_dirty(nilfs_dat_inode(nilfs)); |
| 818 | } |
| 819 | |
| 820 | static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci) |
| 821 | { |
| 822 | struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs; |
| 823 | struct buffer_head *bh_cp; |
| 824 | struct nilfs_checkpoint *raw_cp; |
| 825 | int err; |
| 826 | |
| 827 | /* XXX: this interface will be changed */ |
| 828 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1, |
| 829 | &raw_cp, &bh_cp); |
| 830 | if (likely(!err)) { |
| 831 | /* The following code is duplicated with cpfile. But, it is |
| 832 | needed to collect the checkpoint even if it was not newly |
| 833 | created */ |
| 834 | nilfs_mdt_mark_buffer_dirty(bh_cp); |
| 835 | nilfs_mdt_mark_dirty(nilfs->ns_cpfile); |
| 836 | nilfs_cpfile_put_checkpoint( |
| 837 | nilfs->ns_cpfile, nilfs->ns_cno, bh_cp); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 838 | } else |
| 839 | WARN_ON(err == -EINVAL || err == -ENOENT); |
| 840 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 841 | return err; |
| 842 | } |
| 843 | |
| 844 | static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci) |
| 845 | { |
| 846 | struct nilfs_sb_info *sbi = sci->sc_sbi; |
| 847 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 848 | struct buffer_head *bh_cp; |
| 849 | struct nilfs_checkpoint *raw_cp; |
| 850 | int err; |
| 851 | |
| 852 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0, |
| 853 | &raw_cp, &bh_cp); |
| 854 | if (unlikely(err)) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 855 | WARN_ON(err == -EINVAL || err == -ENOENT); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 856 | goto failed_ibh; |
| 857 | } |
| 858 | raw_cp->cp_snapshot_list.ssl_next = 0; |
| 859 | raw_cp->cp_snapshot_list.ssl_prev = 0; |
| 860 | raw_cp->cp_inodes_count = |
Ryusuke Konishi | b7c0634 | 2010-08-14 14:48:32 +0900 | [diff] [blame] | 861 | cpu_to_le64(atomic_read(&sci->sc_root->inodes_count)); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 862 | raw_cp->cp_blocks_count = |
Ryusuke Konishi | b7c0634 | 2010-08-14 14:48:32 +0900 | [diff] [blame] | 863 | cpu_to_le64(atomic_read(&sci->sc_root->blocks_count)); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 864 | raw_cp->cp_nblk_inc = |
| 865 | cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc); |
| 866 | raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime); |
| 867 | raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno); |
Ryusuke Konishi | 458c5b0 | 2009-04-06 19:01:56 -0700 | [diff] [blame] | 868 | |
Ryusuke Konishi | c96fa46 | 2009-04-06 19:01:57 -0700 | [diff] [blame] | 869 | if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags)) |
| 870 | nilfs_checkpoint_clear_minor(raw_cp); |
| 871 | else |
| 872 | nilfs_checkpoint_set_minor(raw_cp); |
| 873 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 874 | nilfs_write_inode_common(sci->sc_root->ifile, |
| 875 | &raw_cp->cp_ifile_inode, 1); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 876 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp); |
| 877 | return 0; |
| 878 | |
| 879 | failed_ibh: |
| 880 | return err; |
| 881 | } |
| 882 | |
| 883 | static void nilfs_fill_in_file_bmap(struct inode *ifile, |
| 884 | struct nilfs_inode_info *ii) |
| 885 | |
| 886 | { |
| 887 | struct buffer_head *ibh; |
| 888 | struct nilfs_inode *raw_inode; |
| 889 | |
| 890 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) { |
| 891 | ibh = ii->i_bh; |
| 892 | BUG_ON(!ibh); |
| 893 | raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino, |
| 894 | ibh); |
| 895 | nilfs_bmap_write(ii->i_bmap, raw_inode); |
| 896 | nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh); |
| 897 | } |
| 898 | } |
| 899 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 900 | static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 901 | { |
| 902 | struct nilfs_inode_info *ii; |
| 903 | |
| 904 | list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) { |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 905 | nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 906 | set_bit(NILFS_I_COLLECTED, &ii->i_state); |
| 907 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 908 | } |
| 909 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 910 | static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci, |
| 911 | struct the_nilfs *nilfs) |
| 912 | { |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 913 | struct buffer_head *bh_sr; |
| 914 | struct nilfs_super_root *raw_sr; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 915 | unsigned isz = nilfs->ns_inode_size; |
| 916 | |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 917 | bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root; |
| 918 | raw_sr = (struct nilfs_super_root *)bh_sr->b_data; |
| 919 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 920 | raw_sr->sr_bytes = cpu_to_le16(NILFS_SR_BYTES); |
| 921 | raw_sr->sr_nongc_ctime |
| 922 | = cpu_to_le64(nilfs_doing_gc() ? |
| 923 | nilfs->ns_nongc_ctime : sci->sc_seg_ctime); |
| 924 | raw_sr->sr_flags = 0; |
| 925 | |
Ryusuke Konishi | 3961f0e | 2009-11-13 01:55:02 +0900 | [diff] [blame] | 926 | nilfs_write_inode_common(nilfs_dat_inode(nilfs), (void *)raw_sr + |
| 927 | NILFS_SR_DAT_OFFSET(isz), 1); |
| 928 | nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr + |
| 929 | NILFS_SR_CPFILE_OFFSET(isz), 1); |
| 930 | nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr + |
| 931 | NILFS_SR_SUFILE_OFFSET(isz), 1); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 932 | } |
| 933 | |
| 934 | static void nilfs_redirty_inodes(struct list_head *head) |
| 935 | { |
| 936 | struct nilfs_inode_info *ii; |
| 937 | |
| 938 | list_for_each_entry(ii, head, i_dirty) { |
| 939 | if (test_bit(NILFS_I_COLLECTED, &ii->i_state)) |
| 940 | clear_bit(NILFS_I_COLLECTED, &ii->i_state); |
| 941 | } |
| 942 | } |
| 943 | |
| 944 | static void nilfs_drop_collected_inodes(struct list_head *head) |
| 945 | { |
| 946 | struct nilfs_inode_info *ii; |
| 947 | |
| 948 | list_for_each_entry(ii, head, i_dirty) { |
| 949 | if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state)) |
| 950 | continue; |
| 951 | |
| 952 | clear_bit(NILFS_I_INODE_DIRTY, &ii->i_state); |
| 953 | set_bit(NILFS_I_UPDATED, &ii->i_state); |
| 954 | } |
| 955 | } |
| 956 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 957 | static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci, |
| 958 | struct inode *inode, |
| 959 | struct list_head *listp, |
| 960 | int (*collect)(struct nilfs_sc_info *, |
| 961 | struct buffer_head *, |
| 962 | struct inode *)) |
| 963 | { |
| 964 | struct buffer_head *bh, *n; |
| 965 | int err = 0; |
| 966 | |
| 967 | if (collect) { |
| 968 | list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) { |
| 969 | list_del_init(&bh->b_assoc_buffers); |
| 970 | err = collect(sci, bh, inode); |
| 971 | brelse(bh); |
| 972 | if (unlikely(err)) |
| 973 | goto dispose_buffers; |
| 974 | } |
| 975 | return 0; |
| 976 | } |
| 977 | |
| 978 | dispose_buffers: |
| 979 | while (!list_empty(listp)) { |
| 980 | bh = list_entry(listp->next, struct buffer_head, |
| 981 | b_assoc_buffers); |
| 982 | list_del_init(&bh->b_assoc_buffers); |
| 983 | brelse(bh); |
| 984 | } |
| 985 | return err; |
| 986 | } |
| 987 | |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 988 | static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci) |
| 989 | { |
| 990 | /* Remaining number of blocks within segment buffer */ |
| 991 | return sci->sc_segbuf_nblocks - |
| 992 | (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks); |
| 993 | } |
| 994 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 995 | static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci, |
| 996 | struct inode *inode, |
| 997 | struct nilfs_sc_operations *sc_ops) |
| 998 | { |
| 999 | LIST_HEAD(data_buffers); |
| 1000 | LIST_HEAD(node_buffers); |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 1001 | int err; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1002 | |
| 1003 | if (!(sci->sc_stage.flags & NILFS_CF_NODE)) { |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 1004 | size_t n, rest = nilfs_segctor_buffer_rest(sci); |
| 1005 | |
| 1006 | n = nilfs_lookup_dirty_data_buffers( |
| 1007 | inode, &data_buffers, rest + 1, 0, LLONG_MAX); |
| 1008 | if (n > rest) { |
| 1009 | err = nilfs_segctor_apply_buffers( |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1010 | sci, inode, &data_buffers, |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 1011 | sc_ops->collect_data); |
| 1012 | BUG_ON(!err); /* always receive -E2BIG or true error */ |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1013 | goto break_or_fail; |
| 1014 | } |
| 1015 | } |
| 1016 | nilfs_lookup_dirty_node_buffers(inode, &node_buffers); |
| 1017 | |
| 1018 | if (!(sci->sc_stage.flags & NILFS_CF_NODE)) { |
| 1019 | err = nilfs_segctor_apply_buffers( |
| 1020 | sci, inode, &data_buffers, sc_ops->collect_data); |
| 1021 | if (unlikely(err)) { |
| 1022 | /* dispose node list */ |
| 1023 | nilfs_segctor_apply_buffers( |
| 1024 | sci, inode, &node_buffers, NULL); |
| 1025 | goto break_or_fail; |
| 1026 | } |
| 1027 | sci->sc_stage.flags |= NILFS_CF_NODE; |
| 1028 | } |
| 1029 | /* Collect node */ |
| 1030 | err = nilfs_segctor_apply_buffers( |
| 1031 | sci, inode, &node_buffers, sc_ops->collect_node); |
| 1032 | if (unlikely(err)) |
| 1033 | goto break_or_fail; |
| 1034 | |
| 1035 | nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers); |
| 1036 | err = nilfs_segctor_apply_buffers( |
| 1037 | sci, inode, &node_buffers, sc_ops->collect_bmap); |
| 1038 | if (unlikely(err)) |
| 1039 | goto break_or_fail; |
| 1040 | |
| 1041 | nilfs_segctor_end_finfo(sci, inode); |
| 1042 | sci->sc_stage.flags &= ~NILFS_CF_NODE; |
| 1043 | |
| 1044 | break_or_fail: |
| 1045 | return err; |
| 1046 | } |
| 1047 | |
| 1048 | static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci, |
| 1049 | struct inode *inode) |
| 1050 | { |
| 1051 | LIST_HEAD(data_buffers); |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 1052 | size_t n, rest = nilfs_segctor_buffer_rest(sci); |
| 1053 | int err; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1054 | |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 1055 | n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1, |
| 1056 | sci->sc_dsync_start, |
| 1057 | sci->sc_dsync_end); |
| 1058 | |
| 1059 | err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers, |
| 1060 | nilfs_collect_file_data); |
| 1061 | if (!err) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1062 | nilfs_segctor_end_finfo(sci, inode); |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 1063 | BUG_ON(n > rest); |
| 1064 | /* always receive -E2BIG or true error if n > rest */ |
| 1065 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1066 | return err; |
| 1067 | } |
| 1068 | |
| 1069 | static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode) |
| 1070 | { |
| 1071 | struct nilfs_sb_info *sbi = sci->sc_sbi; |
| 1072 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 1073 | struct list_head *head; |
| 1074 | struct nilfs_inode_info *ii; |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 1075 | size_t ndone; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1076 | int err = 0; |
| 1077 | |
| 1078 | switch (sci->sc_stage.scnt) { |
| 1079 | case NILFS_ST_INIT: |
| 1080 | /* Pre-processes */ |
| 1081 | sci->sc_stage.flags = 0; |
| 1082 | |
| 1083 | if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) { |
| 1084 | sci->sc_nblk_inc = 0; |
| 1085 | sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN; |
| 1086 | if (mode == SC_LSEG_DSYNC) { |
| 1087 | sci->sc_stage.scnt = NILFS_ST_DSYNC; |
| 1088 | goto dsync_mode; |
| 1089 | } |
| 1090 | } |
| 1091 | |
| 1092 | sci->sc_stage.dirty_file_ptr = NULL; |
| 1093 | sci->sc_stage.gc_inode_ptr = NULL; |
| 1094 | if (mode == SC_FLUSH_DAT) { |
| 1095 | sci->sc_stage.scnt = NILFS_ST_DAT; |
| 1096 | goto dat_stage; |
| 1097 | } |
| 1098 | sci->sc_stage.scnt++; /* Fall through */ |
| 1099 | case NILFS_ST_GC: |
| 1100 | if (nilfs_doing_gc()) { |
| 1101 | head = &sci->sc_gc_inodes; |
| 1102 | ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr, |
| 1103 | head, i_dirty); |
| 1104 | list_for_each_entry_continue(ii, head, i_dirty) { |
| 1105 | err = nilfs_segctor_scan_file( |
| 1106 | sci, &ii->vfs_inode, |
| 1107 | &nilfs_sc_file_ops); |
| 1108 | if (unlikely(err)) { |
| 1109 | sci->sc_stage.gc_inode_ptr = list_entry( |
| 1110 | ii->i_dirty.prev, |
| 1111 | struct nilfs_inode_info, |
| 1112 | i_dirty); |
| 1113 | goto break_or_fail; |
| 1114 | } |
| 1115 | set_bit(NILFS_I_COLLECTED, &ii->i_state); |
| 1116 | } |
| 1117 | sci->sc_stage.gc_inode_ptr = NULL; |
| 1118 | } |
| 1119 | sci->sc_stage.scnt++; /* Fall through */ |
| 1120 | case NILFS_ST_FILE: |
| 1121 | head = &sci->sc_dirty_files; |
| 1122 | ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head, |
| 1123 | i_dirty); |
| 1124 | list_for_each_entry_continue(ii, head, i_dirty) { |
| 1125 | clear_bit(NILFS_I_DIRTY, &ii->i_state); |
| 1126 | |
| 1127 | err = nilfs_segctor_scan_file(sci, &ii->vfs_inode, |
| 1128 | &nilfs_sc_file_ops); |
| 1129 | if (unlikely(err)) { |
| 1130 | sci->sc_stage.dirty_file_ptr = |
| 1131 | list_entry(ii->i_dirty.prev, |
| 1132 | struct nilfs_inode_info, |
| 1133 | i_dirty); |
| 1134 | goto break_or_fail; |
| 1135 | } |
| 1136 | /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */ |
| 1137 | /* XXX: required ? */ |
| 1138 | } |
| 1139 | sci->sc_stage.dirty_file_ptr = NULL; |
| 1140 | if (mode == SC_FLUSH_FILE) { |
| 1141 | sci->sc_stage.scnt = NILFS_ST_DONE; |
| 1142 | return 0; |
| 1143 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1144 | sci->sc_stage.scnt++; |
| 1145 | sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED; |
| 1146 | /* Fall through */ |
| 1147 | case NILFS_ST_IFILE: |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 1148 | err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile, |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1149 | &nilfs_sc_file_ops); |
| 1150 | if (unlikely(err)) |
| 1151 | break; |
| 1152 | sci->sc_stage.scnt++; |
| 1153 | /* Creating a checkpoint */ |
| 1154 | err = nilfs_segctor_create_checkpoint(sci); |
| 1155 | if (unlikely(err)) |
| 1156 | break; |
| 1157 | /* Fall through */ |
| 1158 | case NILFS_ST_CPFILE: |
| 1159 | err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile, |
| 1160 | &nilfs_sc_file_ops); |
| 1161 | if (unlikely(err)) |
| 1162 | break; |
| 1163 | sci->sc_stage.scnt++; /* Fall through */ |
| 1164 | case NILFS_ST_SUFILE: |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 1165 | err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs, |
| 1166 | sci->sc_nfreesegs, &ndone); |
| 1167 | if (unlikely(err)) { |
| 1168 | nilfs_sufile_cancel_freev(nilfs->ns_sufile, |
| 1169 | sci->sc_freesegs, ndone, |
| 1170 | NULL); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1171 | break; |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 1172 | } |
| 1173 | sci->sc_stage.flags |= NILFS_CF_SUFREED; |
| 1174 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1175 | err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile, |
| 1176 | &nilfs_sc_file_ops); |
| 1177 | if (unlikely(err)) |
| 1178 | break; |
| 1179 | sci->sc_stage.scnt++; /* Fall through */ |
| 1180 | case NILFS_ST_DAT: |
| 1181 | dat_stage: |
| 1182 | err = nilfs_segctor_scan_file(sci, nilfs_dat_inode(nilfs), |
| 1183 | &nilfs_sc_dat_ops); |
| 1184 | if (unlikely(err)) |
| 1185 | break; |
| 1186 | if (mode == SC_FLUSH_DAT) { |
| 1187 | sci->sc_stage.scnt = NILFS_ST_DONE; |
| 1188 | return 0; |
| 1189 | } |
| 1190 | sci->sc_stage.scnt++; /* Fall through */ |
| 1191 | case NILFS_ST_SR: |
| 1192 | if (mode == SC_LSEG_SR) { |
| 1193 | /* Appending a super root */ |
| 1194 | err = nilfs_segctor_add_super_root(sci); |
| 1195 | if (unlikely(err)) |
| 1196 | break; |
| 1197 | } |
| 1198 | /* End of a logical segment */ |
| 1199 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND; |
| 1200 | sci->sc_stage.scnt = NILFS_ST_DONE; |
| 1201 | return 0; |
| 1202 | case NILFS_ST_DSYNC: |
| 1203 | dsync_mode: |
| 1204 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT; |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 1205 | ii = sci->sc_dsync_inode; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1206 | if (!test_bit(NILFS_I_BUSY, &ii->i_state)) |
| 1207 | break; |
| 1208 | |
| 1209 | err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode); |
| 1210 | if (unlikely(err)) |
| 1211 | break; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1212 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND; |
| 1213 | sci->sc_stage.scnt = NILFS_ST_DONE; |
| 1214 | return 0; |
| 1215 | case NILFS_ST_DONE: |
| 1216 | return 0; |
| 1217 | default: |
| 1218 | BUG(); |
| 1219 | } |
| 1220 | |
| 1221 | break_or_fail: |
| 1222 | return err; |
| 1223 | } |
| 1224 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1225 | /** |
| 1226 | * nilfs_segctor_begin_construction - setup segment buffer to make a new log |
| 1227 | * @sci: nilfs_sc_info |
| 1228 | * @nilfs: nilfs object |
| 1229 | */ |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1230 | static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci, |
| 1231 | struct the_nilfs *nilfs) |
| 1232 | { |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1233 | struct nilfs_segment_buffer *segbuf, *prev; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1234 | __u64 nextnum; |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1235 | int err, alloc = 0; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1236 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1237 | segbuf = nilfs_segbuf_new(sci->sc_super); |
| 1238 | if (unlikely(!segbuf)) |
| 1239 | return -ENOMEM; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1240 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1241 | if (list_empty(&sci->sc_write_logs)) { |
| 1242 | nilfs_segbuf_map(segbuf, nilfs->ns_segnum, |
| 1243 | nilfs->ns_pseg_offset, nilfs); |
| 1244 | if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) { |
| 1245 | nilfs_shift_to_next_segment(nilfs); |
| 1246 | nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs); |
| 1247 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1248 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1249 | segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1250 | nextnum = nilfs->ns_nextnum; |
| 1251 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1252 | if (nilfs->ns_segnum == nilfs->ns_nextnum) |
| 1253 | /* Start from the head of a new full segment */ |
| 1254 | alloc++; |
| 1255 | } else { |
| 1256 | /* Continue logs */ |
| 1257 | prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs); |
| 1258 | nilfs_segbuf_map_cont(segbuf, prev); |
| 1259 | segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq; |
| 1260 | nextnum = prev->sb_nextnum; |
| 1261 | |
| 1262 | if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) { |
| 1263 | nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs); |
| 1264 | segbuf->sb_sum.seg_seq++; |
| 1265 | alloc++; |
| 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum); |
| 1270 | if (err) |
| 1271 | goto failed; |
| 1272 | |
| 1273 | if (alloc) { |
| 1274 | err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum); |
| 1275 | if (err) |
| 1276 | goto failed; |
| 1277 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1278 | nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs); |
| 1279 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1280 | BUG_ON(!list_empty(&sci->sc_segbufs)); |
| 1281 | list_add_tail(&segbuf->sb_list, &sci->sc_segbufs); |
| 1282 | sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks; |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 1283 | return 0; |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1284 | |
| 1285 | failed: |
| 1286 | nilfs_segbuf_free(segbuf); |
| 1287 | return err; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1288 | } |
| 1289 | |
| 1290 | static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci, |
| 1291 | struct the_nilfs *nilfs, int nadd) |
| 1292 | { |
Ryusuke Konishi | e29df39 | 2009-11-29 16:51:16 +0900 | [diff] [blame] | 1293 | struct nilfs_segment_buffer *segbuf, *prev; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1294 | struct inode *sufile = nilfs->ns_sufile; |
| 1295 | __u64 nextnextnum; |
| 1296 | LIST_HEAD(list); |
| 1297 | int err, ret, i; |
| 1298 | |
| 1299 | prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs); |
| 1300 | /* |
| 1301 | * Since the segment specified with nextnum might be allocated during |
| 1302 | * the previous construction, the buffer including its segusage may |
| 1303 | * not be dirty. The following call ensures that the buffer is dirty |
| 1304 | * and will pin the buffer on memory until the sufile is written. |
| 1305 | */ |
Ryusuke Konishi | 61a189e | 2009-11-18 17:25:12 +0900 | [diff] [blame] | 1306 | err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1307 | if (unlikely(err)) |
| 1308 | return err; |
| 1309 | |
| 1310 | for (i = 0; i < nadd; i++) { |
| 1311 | /* extend segment info */ |
| 1312 | err = -ENOMEM; |
| 1313 | segbuf = nilfs_segbuf_new(sci->sc_super); |
| 1314 | if (unlikely(!segbuf)) |
| 1315 | goto failed; |
| 1316 | |
| 1317 | /* map this buffer to region of segment on-disk */ |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 1318 | nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1319 | sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks; |
| 1320 | |
| 1321 | /* allocate the next next full segment */ |
| 1322 | err = nilfs_sufile_alloc(sufile, &nextnextnum); |
| 1323 | if (unlikely(err)) |
| 1324 | goto failed_segbuf; |
| 1325 | |
| 1326 | segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1; |
| 1327 | nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs); |
| 1328 | |
| 1329 | list_add_tail(&segbuf->sb_list, &list); |
| 1330 | prev = segbuf; |
| 1331 | } |
Ryusuke Konishi | 0935db7 | 2009-11-29 02:39:11 +0900 | [diff] [blame] | 1332 | list_splice_tail(&list, &sci->sc_segbufs); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1333 | return 0; |
| 1334 | |
| 1335 | failed_segbuf: |
| 1336 | nilfs_segbuf_free(segbuf); |
| 1337 | failed: |
Ryusuke Konishi | e29df39 | 2009-11-29 16:51:16 +0900 | [diff] [blame] | 1338 | list_for_each_entry(segbuf, &list, sb_list) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1339 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1340 | WARN_ON(ret); /* never fails */ |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1341 | } |
Ryusuke Konishi | e29df39 | 2009-11-29 16:51:16 +0900 | [diff] [blame] | 1342 | nilfs_destroy_logs(&list); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1343 | return err; |
| 1344 | } |
| 1345 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1346 | static void nilfs_free_incomplete_logs(struct list_head *logs, |
| 1347 | struct the_nilfs *nilfs) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1348 | { |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1349 | struct nilfs_segment_buffer *segbuf, *prev; |
| 1350 | struct inode *sufile = nilfs->ns_sufile; |
Ryusuke Konishi | 9284ad2 | 2009-11-25 01:04:21 +0900 | [diff] [blame] | 1351 | int ret; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1352 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1353 | segbuf = NILFS_FIRST_SEGBUF(logs); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1354 | if (nilfs->ns_nextnum != segbuf->sb_nextnum) { |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1355 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1356 | WARN_ON(ret); /* never fails */ |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1357 | } |
Ryusuke Konishi | 9284ad2 | 2009-11-25 01:04:21 +0900 | [diff] [blame] | 1358 | if (atomic_read(&segbuf->sb_err)) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1359 | /* Case 1: The first segment failed */ |
| 1360 | if (segbuf->sb_pseg_start != segbuf->sb_fseg_start) |
| 1361 | /* Case 1a: Partial segment appended into an existing |
| 1362 | segment */ |
| 1363 | nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start, |
| 1364 | segbuf->sb_fseg_end); |
| 1365 | else /* Case 1b: New full segment */ |
| 1366 | set_nilfs_discontinued(nilfs); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1367 | } |
| 1368 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1369 | prev = segbuf; |
| 1370 | list_for_each_entry_continue(segbuf, logs, sb_list) { |
| 1371 | if (prev->sb_nextnum != segbuf->sb_nextnum) { |
| 1372 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
| 1373 | WARN_ON(ret); /* never fails */ |
| 1374 | } |
Ryusuke Konishi | 9284ad2 | 2009-11-25 01:04:21 +0900 | [diff] [blame] | 1375 | if (atomic_read(&segbuf->sb_err) && |
| 1376 | segbuf->sb_segnum != nilfs->ns_nextnum) |
| 1377 | /* Case 2: extended segment (!= next) failed */ |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1378 | nilfs_sufile_set_error(sufile, segbuf->sb_segnum); |
| 1379 | prev = segbuf; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1380 | } |
| 1381 | } |
| 1382 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1383 | static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci, |
| 1384 | struct inode *sufile) |
| 1385 | { |
| 1386 | struct nilfs_segment_buffer *segbuf; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1387 | unsigned long live_blocks; |
| 1388 | int ret; |
| 1389 | |
| 1390 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1391 | live_blocks = segbuf->sb_sum.nblocks + |
| 1392 | (segbuf->sb_pseg_start - segbuf->sb_fseg_start); |
Ryusuke Konishi | 071ec54 | 2009-11-18 18:23:34 +0900 | [diff] [blame] | 1393 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
| 1394 | live_blocks, |
| 1395 | sci->sc_seg_ctime); |
| 1396 | WARN_ON(ret); /* always succeed because the segusage is dirty */ |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1397 | } |
| 1398 | } |
| 1399 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1400 | static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1401 | { |
| 1402 | struct nilfs_segment_buffer *segbuf; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1403 | int ret; |
| 1404 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1405 | segbuf = NILFS_FIRST_SEGBUF(logs); |
Ryusuke Konishi | 071ec54 | 2009-11-18 18:23:34 +0900 | [diff] [blame] | 1406 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
| 1407 | segbuf->sb_pseg_start - |
| 1408 | segbuf->sb_fseg_start, 0); |
| 1409 | WARN_ON(ret); /* always succeed because the segusage is dirty */ |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1410 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1411 | list_for_each_entry_continue(segbuf, logs, sb_list) { |
Ryusuke Konishi | 071ec54 | 2009-11-18 18:23:34 +0900 | [diff] [blame] | 1412 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
| 1413 | 0, 0); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1414 | WARN_ON(ret); /* always succeed */ |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1415 | } |
| 1416 | } |
| 1417 | |
| 1418 | static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci, |
| 1419 | struct nilfs_segment_buffer *last, |
| 1420 | struct inode *sufile) |
| 1421 | { |
Ryusuke Konishi | e29df39 | 2009-11-29 16:51:16 +0900 | [diff] [blame] | 1422 | struct nilfs_segment_buffer *segbuf = last; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1423 | int ret; |
| 1424 | |
Ryusuke Konishi | e29df39 | 2009-11-29 16:51:16 +0900 | [diff] [blame] | 1425 | list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1426 | sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks; |
| 1427 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1428 | WARN_ON(ret); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1429 | } |
Ryusuke Konishi | e29df39 | 2009-11-29 16:51:16 +0900 | [diff] [blame] | 1430 | nilfs_truncate_logs(&sci->sc_segbufs, last); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1431 | } |
| 1432 | |
| 1433 | |
| 1434 | static int nilfs_segctor_collect(struct nilfs_sc_info *sci, |
| 1435 | struct the_nilfs *nilfs, int mode) |
| 1436 | { |
| 1437 | struct nilfs_cstage prev_stage = sci->sc_stage; |
| 1438 | int err, nadd = 1; |
| 1439 | |
| 1440 | /* Collection retry loop */ |
| 1441 | for (;;) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1442 | sci->sc_nblk_this_inc = 0; |
| 1443 | sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs); |
| 1444 | |
| 1445 | err = nilfs_segctor_reset_segment_buffer(sci); |
| 1446 | if (unlikely(err)) |
| 1447 | goto failed; |
| 1448 | |
| 1449 | err = nilfs_segctor_collect_blocks(sci, mode); |
| 1450 | sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks; |
| 1451 | if (!err) |
| 1452 | break; |
| 1453 | |
| 1454 | if (unlikely(err != -E2BIG)) |
| 1455 | goto failed; |
| 1456 | |
| 1457 | /* The current segment is filled up */ |
| 1458 | if (mode != SC_LSEG_SR || sci->sc_stage.scnt < NILFS_ST_CPFILE) |
| 1459 | break; |
| 1460 | |
Ryusuke Konishi | 2d8428a | 2010-03-22 14:01:24 +0900 | [diff] [blame] | 1461 | nilfs_clear_logs(&sci->sc_segbufs); |
| 1462 | |
| 1463 | err = nilfs_segctor_extend_segments(sci, nilfs, nadd); |
| 1464 | if (unlikely(err)) |
| 1465 | return err; |
| 1466 | |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 1467 | if (sci->sc_stage.flags & NILFS_CF_SUFREED) { |
| 1468 | err = nilfs_sufile_cancel_freev(nilfs->ns_sufile, |
| 1469 | sci->sc_freesegs, |
| 1470 | sci->sc_nfreesegs, |
| 1471 | NULL); |
| 1472 | WARN_ON(err); /* do not happen */ |
| 1473 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1474 | nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA); |
| 1475 | sci->sc_stage = prev_stage; |
| 1476 | } |
| 1477 | nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile); |
| 1478 | return 0; |
| 1479 | |
| 1480 | failed: |
| 1481 | return err; |
| 1482 | } |
| 1483 | |
| 1484 | static void nilfs_list_replace_buffer(struct buffer_head *old_bh, |
| 1485 | struct buffer_head *new_bh) |
| 1486 | { |
| 1487 | BUG_ON(!list_empty(&new_bh->b_assoc_buffers)); |
| 1488 | |
| 1489 | list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers); |
| 1490 | /* The caller must release old_bh */ |
| 1491 | } |
| 1492 | |
| 1493 | static int |
| 1494 | nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci, |
| 1495 | struct nilfs_segment_buffer *segbuf, |
| 1496 | int mode) |
| 1497 | { |
| 1498 | struct inode *inode = NULL; |
| 1499 | sector_t blocknr; |
| 1500 | unsigned long nfinfo = segbuf->sb_sum.nfinfo; |
| 1501 | unsigned long nblocks = 0, ndatablk = 0; |
| 1502 | struct nilfs_sc_operations *sc_op = NULL; |
| 1503 | struct nilfs_segsum_pointer ssp; |
| 1504 | struct nilfs_finfo *finfo = NULL; |
| 1505 | union nilfs_binfo binfo; |
| 1506 | struct buffer_head *bh, *bh_org; |
| 1507 | ino_t ino = 0; |
| 1508 | int err = 0; |
| 1509 | |
| 1510 | if (!nfinfo) |
| 1511 | goto out; |
| 1512 | |
| 1513 | blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk; |
| 1514 | ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers); |
| 1515 | ssp.offset = sizeof(struct nilfs_segment_summary); |
| 1516 | |
| 1517 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 1518 | if (bh == segbuf->sb_super_root) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1519 | break; |
| 1520 | if (!finfo) { |
| 1521 | finfo = nilfs_segctor_map_segsum_entry( |
| 1522 | sci, &ssp, sizeof(*finfo)); |
| 1523 | ino = le64_to_cpu(finfo->fi_ino); |
| 1524 | nblocks = le32_to_cpu(finfo->fi_nblocks); |
| 1525 | ndatablk = le32_to_cpu(finfo->fi_ndatablk); |
| 1526 | |
| 1527 | if (buffer_nilfs_node(bh)) |
| 1528 | inode = NILFS_BTNC_I(bh->b_page->mapping); |
| 1529 | else |
| 1530 | inode = NILFS_AS_I(bh->b_page->mapping); |
| 1531 | |
| 1532 | if (mode == SC_LSEG_DSYNC) |
| 1533 | sc_op = &nilfs_sc_dsync_ops; |
| 1534 | else if (ino == NILFS_DAT_INO) |
| 1535 | sc_op = &nilfs_sc_dat_ops; |
| 1536 | else /* file blocks */ |
| 1537 | sc_op = &nilfs_sc_file_ops; |
| 1538 | } |
| 1539 | bh_org = bh; |
| 1540 | get_bh(bh_org); |
| 1541 | err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr, |
| 1542 | &binfo); |
| 1543 | if (bh != bh_org) |
| 1544 | nilfs_list_replace_buffer(bh_org, bh); |
| 1545 | brelse(bh_org); |
| 1546 | if (unlikely(err)) |
| 1547 | goto failed_bmap; |
| 1548 | |
| 1549 | if (ndatablk > 0) |
| 1550 | sc_op->write_data_binfo(sci, &ssp, &binfo); |
| 1551 | else |
| 1552 | sc_op->write_node_binfo(sci, &ssp, &binfo); |
| 1553 | |
| 1554 | blocknr++; |
| 1555 | if (--nblocks == 0) { |
| 1556 | finfo = NULL; |
| 1557 | if (--nfinfo == 0) |
| 1558 | break; |
| 1559 | } else if (ndatablk > 0) |
| 1560 | ndatablk--; |
| 1561 | } |
| 1562 | out: |
| 1563 | return 0; |
| 1564 | |
| 1565 | failed_bmap: |
| 1566 | err = nilfs_handle_bmap_error(err, __func__, inode, sci->sc_super); |
| 1567 | return err; |
| 1568 | } |
| 1569 | |
| 1570 | static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode) |
| 1571 | { |
| 1572 | struct nilfs_segment_buffer *segbuf; |
| 1573 | int err; |
| 1574 | |
| 1575 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { |
| 1576 | err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode); |
| 1577 | if (unlikely(err)) |
| 1578 | return err; |
| 1579 | nilfs_segbuf_fill_in_segsum(segbuf); |
| 1580 | } |
| 1581 | return 0; |
| 1582 | } |
| 1583 | |
| 1584 | static int |
| 1585 | nilfs_copy_replace_page_buffers(struct page *page, struct list_head *out) |
| 1586 | { |
| 1587 | struct page *clone_page; |
| 1588 | struct buffer_head *bh, *head, *bh2; |
| 1589 | void *kaddr; |
| 1590 | |
| 1591 | bh = head = page_buffers(page); |
| 1592 | |
| 1593 | clone_page = nilfs_alloc_private_page(bh->b_bdev, bh->b_size, 0); |
| 1594 | if (unlikely(!clone_page)) |
| 1595 | return -ENOMEM; |
| 1596 | |
| 1597 | bh2 = page_buffers(clone_page); |
| 1598 | kaddr = kmap_atomic(page, KM_USER0); |
| 1599 | do { |
| 1600 | if (list_empty(&bh->b_assoc_buffers)) |
| 1601 | continue; |
| 1602 | get_bh(bh2); |
| 1603 | page_cache_get(clone_page); /* for each bh */ |
| 1604 | memcpy(bh2->b_data, kaddr + bh_offset(bh), bh2->b_size); |
| 1605 | bh2->b_blocknr = bh->b_blocknr; |
| 1606 | list_replace(&bh->b_assoc_buffers, &bh2->b_assoc_buffers); |
| 1607 | list_add_tail(&bh->b_assoc_buffers, out); |
| 1608 | } while (bh = bh->b_this_page, bh2 = bh2->b_this_page, bh != head); |
| 1609 | kunmap_atomic(kaddr, KM_USER0); |
| 1610 | |
| 1611 | if (!TestSetPageWriteback(clone_page)) |
| 1612 | inc_zone_page_state(clone_page, NR_WRITEBACK); |
| 1613 | unlock_page(clone_page); |
| 1614 | |
| 1615 | return 0; |
| 1616 | } |
| 1617 | |
| 1618 | static int nilfs_test_page_to_be_frozen(struct page *page) |
| 1619 | { |
| 1620 | struct address_space *mapping = page->mapping; |
| 1621 | |
| 1622 | if (!mapping || !mapping->host || S_ISDIR(mapping->host->i_mode)) |
| 1623 | return 0; |
| 1624 | |
| 1625 | if (page_mapped(page)) { |
| 1626 | ClearPageChecked(page); |
| 1627 | return 1; |
| 1628 | } |
| 1629 | return PageChecked(page); |
| 1630 | } |
| 1631 | |
| 1632 | static int nilfs_begin_page_io(struct page *page, struct list_head *out) |
| 1633 | { |
| 1634 | if (!page || PageWriteback(page)) |
| 1635 | /* For split b-tree node pages, this function may be called |
| 1636 | twice. We ignore the 2nd or later calls by this check. */ |
| 1637 | return 0; |
| 1638 | |
| 1639 | lock_page(page); |
| 1640 | clear_page_dirty_for_io(page); |
| 1641 | set_page_writeback(page); |
| 1642 | unlock_page(page); |
| 1643 | |
| 1644 | if (nilfs_test_page_to_be_frozen(page)) { |
| 1645 | int err = nilfs_copy_replace_page_buffers(page, out); |
| 1646 | if (unlikely(err)) |
| 1647 | return err; |
| 1648 | } |
| 1649 | return 0; |
| 1650 | } |
| 1651 | |
| 1652 | static int nilfs_segctor_prepare_write(struct nilfs_sc_info *sci, |
| 1653 | struct page **failed_page) |
| 1654 | { |
| 1655 | struct nilfs_segment_buffer *segbuf; |
| 1656 | struct page *bd_page = NULL, *fs_page = NULL; |
| 1657 | struct list_head *list = &sci->sc_copied_buffers; |
| 1658 | int err; |
| 1659 | |
| 1660 | *failed_page = NULL; |
| 1661 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { |
| 1662 | struct buffer_head *bh; |
| 1663 | |
| 1664 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, |
| 1665 | b_assoc_buffers) { |
| 1666 | if (bh->b_page != bd_page) { |
| 1667 | if (bd_page) { |
| 1668 | lock_page(bd_page); |
| 1669 | clear_page_dirty_for_io(bd_page); |
| 1670 | set_page_writeback(bd_page); |
| 1671 | unlock_page(bd_page); |
| 1672 | } |
| 1673 | bd_page = bh->b_page; |
| 1674 | } |
| 1675 | } |
| 1676 | |
| 1677 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, |
| 1678 | b_assoc_buffers) { |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 1679 | if (bh == segbuf->sb_super_root) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1680 | if (bh->b_page != bd_page) { |
| 1681 | lock_page(bd_page); |
| 1682 | clear_page_dirty_for_io(bd_page); |
| 1683 | set_page_writeback(bd_page); |
| 1684 | unlock_page(bd_page); |
| 1685 | bd_page = bh->b_page; |
| 1686 | } |
| 1687 | break; |
| 1688 | } |
| 1689 | if (bh->b_page != fs_page) { |
| 1690 | err = nilfs_begin_page_io(fs_page, list); |
| 1691 | if (unlikely(err)) { |
| 1692 | *failed_page = fs_page; |
| 1693 | goto out; |
| 1694 | } |
| 1695 | fs_page = bh->b_page; |
| 1696 | } |
| 1697 | } |
| 1698 | } |
| 1699 | if (bd_page) { |
| 1700 | lock_page(bd_page); |
| 1701 | clear_page_dirty_for_io(bd_page); |
| 1702 | set_page_writeback(bd_page); |
| 1703 | unlock_page(bd_page); |
| 1704 | } |
| 1705 | err = nilfs_begin_page_io(fs_page, list); |
| 1706 | if (unlikely(err)) |
| 1707 | *failed_page = fs_page; |
| 1708 | out: |
| 1709 | return err; |
| 1710 | } |
| 1711 | |
| 1712 | static int nilfs_segctor_write(struct nilfs_sc_info *sci, |
Ryusuke Konishi | 9c965ba | 2009-11-29 01:17:31 +0900 | [diff] [blame] | 1713 | struct the_nilfs *nilfs) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1714 | { |
Ryusuke Konishi | d1c6b72 | 2009-12-17 00:55:40 +0900 | [diff] [blame] | 1715 | int ret; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1716 | |
Ryusuke Konishi | d1c6b72 | 2009-12-17 00:55:40 +0900 | [diff] [blame] | 1717 | ret = nilfs_write_logs(&sci->sc_segbufs, nilfs); |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1718 | list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs); |
| 1719 | return ret; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1720 | } |
| 1721 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1722 | static void __nilfs_end_page_io(struct page *page, int err) |
| 1723 | { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1724 | if (!err) { |
| 1725 | if (!nilfs_page_buffers_clean(page)) |
| 1726 | __set_page_dirty_nobuffers(page); |
| 1727 | ClearPageError(page); |
| 1728 | } else { |
| 1729 | __set_page_dirty_nobuffers(page); |
| 1730 | SetPageError(page); |
| 1731 | } |
| 1732 | |
| 1733 | if (buffer_nilfs_allocated(page_buffers(page))) { |
| 1734 | if (TestClearPageWriteback(page)) |
| 1735 | dec_zone_page_state(page, NR_WRITEBACK); |
| 1736 | } else |
| 1737 | end_page_writeback(page); |
| 1738 | } |
| 1739 | |
| 1740 | static void nilfs_end_page_io(struct page *page, int err) |
| 1741 | { |
| 1742 | if (!page) |
| 1743 | return; |
| 1744 | |
Ryusuke Konishi | a977784 | 2009-07-28 17:55:29 +0900 | [diff] [blame] | 1745 | if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) { |
Ryusuke Konishi | 8227b29 | 2009-06-18 23:52:23 +0900 | [diff] [blame] | 1746 | /* |
| 1747 | * For b-tree node pages, this function may be called twice |
| 1748 | * or more because they might be split in a segment. |
| 1749 | */ |
Ryusuke Konishi | a977784 | 2009-07-28 17:55:29 +0900 | [diff] [blame] | 1750 | if (PageDirty(page)) { |
| 1751 | /* |
| 1752 | * For pages holding split b-tree node buffers, dirty |
| 1753 | * flag on the buffers may be cleared discretely. |
| 1754 | * In that case, the page is once redirtied for |
| 1755 | * remaining buffers, and it must be cancelled if |
| 1756 | * all the buffers get cleaned later. |
| 1757 | */ |
| 1758 | lock_page(page); |
| 1759 | if (nilfs_page_buffers_clean(page)) |
| 1760 | __nilfs_clear_page_dirty(page); |
| 1761 | unlock_page(page); |
| 1762 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1763 | return; |
Ryusuke Konishi | a977784 | 2009-07-28 17:55:29 +0900 | [diff] [blame] | 1764 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1765 | |
| 1766 | __nilfs_end_page_io(page, err); |
| 1767 | } |
| 1768 | |
| 1769 | static void nilfs_clear_copied_buffers(struct list_head *list, int err) |
| 1770 | { |
| 1771 | struct buffer_head *bh, *head; |
| 1772 | struct page *page; |
| 1773 | |
| 1774 | while (!list_empty(list)) { |
| 1775 | bh = list_entry(list->next, struct buffer_head, |
| 1776 | b_assoc_buffers); |
| 1777 | page = bh->b_page; |
| 1778 | page_cache_get(page); |
| 1779 | head = bh = page_buffers(page); |
| 1780 | do { |
| 1781 | if (!list_empty(&bh->b_assoc_buffers)) { |
| 1782 | list_del_init(&bh->b_assoc_buffers); |
| 1783 | if (!err) { |
| 1784 | set_buffer_uptodate(bh); |
| 1785 | clear_buffer_dirty(bh); |
| 1786 | clear_buffer_nilfs_volatile(bh); |
| 1787 | } |
| 1788 | brelse(bh); /* for b_assoc_buffers */ |
| 1789 | } |
| 1790 | } while ((bh = bh->b_this_page) != head); |
| 1791 | |
| 1792 | __nilfs_end_page_io(page, err); |
| 1793 | page_cache_release(page); |
| 1794 | } |
| 1795 | } |
| 1796 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1797 | static void nilfs_abort_logs(struct list_head *logs, struct page *failed_page, |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 1798 | int err) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1799 | { |
| 1800 | struct nilfs_segment_buffer *segbuf; |
| 1801 | struct page *bd_page = NULL, *fs_page = NULL; |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1802 | struct buffer_head *bh; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1803 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1804 | if (list_empty(logs)) |
| 1805 | return; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1806 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1807 | list_for_each_entry(segbuf, logs, sb_list) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1808 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, |
| 1809 | b_assoc_buffers) { |
| 1810 | if (bh->b_page != bd_page) { |
| 1811 | if (bd_page) |
| 1812 | end_page_writeback(bd_page); |
| 1813 | bd_page = bh->b_page; |
| 1814 | } |
| 1815 | } |
| 1816 | |
| 1817 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, |
| 1818 | b_assoc_buffers) { |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 1819 | if (bh == segbuf->sb_super_root) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1820 | if (bh->b_page != bd_page) { |
| 1821 | end_page_writeback(bd_page); |
| 1822 | bd_page = bh->b_page; |
| 1823 | } |
| 1824 | break; |
| 1825 | } |
| 1826 | if (bh->b_page != fs_page) { |
| 1827 | nilfs_end_page_io(fs_page, err); |
Ryusuke Konishi | 8227b29 | 2009-06-18 23:52:23 +0900 | [diff] [blame] | 1828 | if (fs_page && fs_page == failed_page) |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1829 | return; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1830 | fs_page = bh->b_page; |
| 1831 | } |
| 1832 | } |
| 1833 | } |
| 1834 | if (bd_page) |
| 1835 | end_page_writeback(bd_page); |
| 1836 | |
| 1837 | nilfs_end_page_io(fs_page, err); |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1838 | } |
| 1839 | |
| 1840 | static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci, |
| 1841 | struct the_nilfs *nilfs, int err) |
| 1842 | { |
| 1843 | LIST_HEAD(logs); |
| 1844 | int ret; |
| 1845 | |
| 1846 | list_splice_tail_init(&sci->sc_write_logs, &logs); |
| 1847 | ret = nilfs_wait_on_logs(&logs); |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 1848 | nilfs_abort_logs(&logs, NULL, ret ? : err); |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1849 | |
| 1850 | list_splice_tail_init(&sci->sc_segbufs, &logs); |
| 1851 | nilfs_cancel_segusage(&logs, nilfs->ns_sufile); |
| 1852 | nilfs_free_incomplete_logs(&logs, nilfs); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1853 | nilfs_clear_copied_buffers(&sci->sc_copied_buffers, err); |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1854 | |
| 1855 | if (sci->sc_stage.flags & NILFS_CF_SUFREED) { |
| 1856 | ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile, |
| 1857 | sci->sc_freesegs, |
| 1858 | sci->sc_nfreesegs, |
| 1859 | NULL); |
| 1860 | WARN_ON(ret); /* do not happen */ |
| 1861 | } |
| 1862 | |
| 1863 | nilfs_destroy_logs(&logs); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1864 | } |
| 1865 | |
| 1866 | static void nilfs_set_next_segment(struct the_nilfs *nilfs, |
| 1867 | struct nilfs_segment_buffer *segbuf) |
| 1868 | { |
| 1869 | nilfs->ns_segnum = segbuf->sb_segnum; |
| 1870 | nilfs->ns_nextnum = segbuf->sb_nextnum; |
| 1871 | nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start |
| 1872 | + segbuf->sb_sum.nblocks; |
| 1873 | nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq; |
| 1874 | nilfs->ns_ctime = segbuf->sb_sum.ctime; |
| 1875 | } |
| 1876 | |
| 1877 | static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci) |
| 1878 | { |
| 1879 | struct nilfs_segment_buffer *segbuf; |
| 1880 | struct page *bd_page = NULL, *fs_page = NULL; |
Ryusuke Konishi | e605f0a | 2009-12-09 00:57:52 +0900 | [diff] [blame] | 1881 | struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs; |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 1882 | int update_sr = false; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1883 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1884 | list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1885 | struct buffer_head *bh; |
| 1886 | |
| 1887 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, |
| 1888 | b_assoc_buffers) { |
| 1889 | set_buffer_uptodate(bh); |
| 1890 | clear_buffer_dirty(bh); |
| 1891 | if (bh->b_page != bd_page) { |
| 1892 | if (bd_page) |
| 1893 | end_page_writeback(bd_page); |
| 1894 | bd_page = bh->b_page; |
| 1895 | } |
| 1896 | } |
| 1897 | /* |
| 1898 | * We assume that the buffers which belong to the same page |
| 1899 | * continue over the buffer list. |
| 1900 | * Under this assumption, the last BHs of pages is |
| 1901 | * identifiable by the discontinuity of bh->b_page |
| 1902 | * (page != fs_page). |
| 1903 | * |
| 1904 | * For B-tree node blocks, however, this assumption is not |
| 1905 | * guaranteed. The cleanup code of B-tree node pages needs |
| 1906 | * special care. |
| 1907 | */ |
| 1908 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, |
| 1909 | b_assoc_buffers) { |
| 1910 | set_buffer_uptodate(bh); |
| 1911 | clear_buffer_dirty(bh); |
| 1912 | clear_buffer_nilfs_volatile(bh); |
Ryusuke Konishi | b1f6a4f | 2010-08-31 11:40:34 +0900 | [diff] [blame] | 1913 | clear_buffer_nilfs_redirected(bh); |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 1914 | if (bh == segbuf->sb_super_root) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1915 | if (bh->b_page != bd_page) { |
| 1916 | end_page_writeback(bd_page); |
| 1917 | bd_page = bh->b_page; |
| 1918 | } |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 1919 | update_sr = true; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1920 | break; |
| 1921 | } |
| 1922 | if (bh->b_page != fs_page) { |
| 1923 | nilfs_end_page_io(fs_page, 0); |
| 1924 | fs_page = bh->b_page; |
| 1925 | } |
| 1926 | } |
| 1927 | |
Ryusuke Konishi | 4762077 | 2010-05-23 21:48:36 +0900 | [diff] [blame] | 1928 | if (!nilfs_segbuf_simplex(segbuf)) { |
| 1929 | if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1930 | set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags); |
| 1931 | sci->sc_lseg_stime = jiffies; |
| 1932 | } |
Ryusuke Konishi | 4762077 | 2010-05-23 21:48:36 +0900 | [diff] [blame] | 1933 | if (segbuf->sb_sum.flags & NILFS_SS_LOGEND) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1934 | clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags); |
| 1935 | } |
| 1936 | } |
| 1937 | /* |
| 1938 | * Since pages may continue over multiple segment buffers, |
| 1939 | * end of the last page must be checked outside of the loop. |
| 1940 | */ |
| 1941 | if (bd_page) |
| 1942 | end_page_writeback(bd_page); |
| 1943 | |
| 1944 | nilfs_end_page_io(fs_page, 0); |
| 1945 | |
| 1946 | nilfs_clear_copied_buffers(&sci->sc_copied_buffers, 0); |
| 1947 | |
| 1948 | nilfs_drop_collected_inodes(&sci->sc_dirty_files); |
| 1949 | |
Ryusuke Konishi | c1c1d7092 | 2010-08-29 12:44:56 +0900 | [diff] [blame] | 1950 | if (nilfs_doing_gc()) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1951 | nilfs_drop_collected_inodes(&sci->sc_gc_inodes); |
Ryusuke Konishi | c1c1d7092 | 2010-08-29 12:44:56 +0900 | [diff] [blame] | 1952 | else |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1953 | nilfs->ns_nongc_ctime = sci->sc_seg_ctime; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1954 | |
| 1955 | sci->sc_nblk_inc += sci->sc_nblk_this_inc; |
| 1956 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1957 | segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1958 | nilfs_set_next_segment(nilfs, segbuf); |
| 1959 | |
| 1960 | if (update_sr) { |
| 1961 | nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start, |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 1962 | segbuf->sb_sum.seg_seq, nilfs->ns_cno++); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1963 | |
Ryusuke Konishi | c96fa46 | 2009-04-06 19:01:57 -0700 | [diff] [blame] | 1964 | clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1965 | clear_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
| 1966 | set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags); |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1967 | nilfs_segctor_clear_metadata_dirty(sci); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1968 | } else |
| 1969 | clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags); |
| 1970 | } |
| 1971 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 1972 | static int nilfs_segctor_wait(struct nilfs_sc_info *sci) |
| 1973 | { |
| 1974 | int ret; |
| 1975 | |
| 1976 | ret = nilfs_wait_on_logs(&sci->sc_write_logs); |
| 1977 | if (!ret) { |
| 1978 | nilfs_segctor_complete_write(sci); |
| 1979 | nilfs_destroy_logs(&sci->sc_write_logs); |
| 1980 | } |
| 1981 | return ret; |
| 1982 | } |
| 1983 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1984 | static int nilfs_segctor_check_in_files(struct nilfs_sc_info *sci, |
| 1985 | struct nilfs_sb_info *sbi) |
| 1986 | { |
| 1987 | struct nilfs_inode_info *ii, *n; |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 1988 | struct inode *ifile = sci->sc_root->ifile; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 1989 | |
| 1990 | spin_lock(&sbi->s_inode_lock); |
| 1991 | retry: |
| 1992 | list_for_each_entry_safe(ii, n, &sbi->s_dirty_files, i_dirty) { |
| 1993 | if (!ii->i_bh) { |
| 1994 | struct buffer_head *ibh; |
| 1995 | int err; |
| 1996 | |
| 1997 | spin_unlock(&sbi->s_inode_lock); |
| 1998 | err = nilfs_ifile_get_inode_block( |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 1999 | ifile, ii->vfs_inode.i_ino, &ibh); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2000 | if (unlikely(err)) { |
| 2001 | nilfs_warning(sbi->s_super, __func__, |
| 2002 | "failed to get inode block.\n"); |
| 2003 | return err; |
| 2004 | } |
| 2005 | nilfs_mdt_mark_buffer_dirty(ibh); |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 2006 | nilfs_mdt_mark_dirty(ifile); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2007 | spin_lock(&sbi->s_inode_lock); |
| 2008 | if (likely(!ii->i_bh)) |
| 2009 | ii->i_bh = ibh; |
| 2010 | else |
| 2011 | brelse(ibh); |
| 2012 | goto retry; |
| 2013 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2014 | |
| 2015 | clear_bit(NILFS_I_QUEUED, &ii->i_state); |
| 2016 | set_bit(NILFS_I_BUSY, &ii->i_state); |
| 2017 | list_del(&ii->i_dirty); |
| 2018 | list_add_tail(&ii->i_dirty, &sci->sc_dirty_files); |
| 2019 | } |
| 2020 | spin_unlock(&sbi->s_inode_lock); |
| 2021 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2022 | return 0; |
| 2023 | } |
| 2024 | |
| 2025 | static void nilfs_segctor_check_out_files(struct nilfs_sc_info *sci, |
| 2026 | struct nilfs_sb_info *sbi) |
| 2027 | { |
| 2028 | struct nilfs_transaction_info *ti = current->journal_info; |
| 2029 | struct nilfs_inode_info *ii, *n; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2030 | |
| 2031 | spin_lock(&sbi->s_inode_lock); |
| 2032 | list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) { |
| 2033 | if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) || |
Ryusuke Konishi | 6c43f41 | 2010-08-20 20:10:38 +0900 | [diff] [blame] | 2034 | test_bit(NILFS_I_DIRTY, &ii->i_state)) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2035 | continue; |
Ryusuke Konishi | 6c43f41 | 2010-08-20 20:10:38 +0900 | [diff] [blame] | 2036 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2037 | clear_bit(NILFS_I_BUSY, &ii->i_state); |
| 2038 | brelse(ii->i_bh); |
| 2039 | ii->i_bh = NULL; |
| 2040 | list_del(&ii->i_dirty); |
| 2041 | list_add_tail(&ii->i_dirty, &ti->ti_garbage); |
| 2042 | } |
| 2043 | spin_unlock(&sbi->s_inode_lock); |
| 2044 | } |
| 2045 | |
| 2046 | /* |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2047 | * Main procedure of segment constructor |
| 2048 | */ |
| 2049 | static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode) |
| 2050 | { |
| 2051 | struct nilfs_sb_info *sbi = sci->sc_sbi; |
| 2052 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 2053 | struct page *failed_page; |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 2054 | int err; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2055 | |
| 2056 | sci->sc_stage.scnt = NILFS_ST_INIT; |
Ryusuke Konishi | 6c43f41 | 2010-08-20 20:10:38 +0900 | [diff] [blame] | 2057 | sci->sc_cno = nilfs->ns_cno; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2058 | |
| 2059 | err = nilfs_segctor_check_in_files(sci, sbi); |
| 2060 | if (unlikely(err)) |
| 2061 | goto out; |
| 2062 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 2063 | if (nilfs_test_metadata_dirty(nilfs, sci->sc_root)) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2064 | set_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
| 2065 | |
| 2066 | if (nilfs_segctor_clean(sci)) |
| 2067 | goto out; |
| 2068 | |
| 2069 | do { |
| 2070 | sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK; |
| 2071 | |
| 2072 | err = nilfs_segctor_begin_construction(sci, nilfs); |
| 2073 | if (unlikely(err)) |
| 2074 | goto out; |
| 2075 | |
| 2076 | /* Update time stamp */ |
| 2077 | sci->sc_seg_ctime = get_seconds(); |
| 2078 | |
| 2079 | err = nilfs_segctor_collect(sci, nilfs, mode); |
| 2080 | if (unlikely(err)) |
| 2081 | goto failed; |
| 2082 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2083 | /* Avoid empty segment */ |
| 2084 | if (sci->sc_stage.scnt == NILFS_ST_DONE && |
Ryusuke Konishi | 4762077 | 2010-05-23 21:48:36 +0900 | [diff] [blame] | 2085 | nilfs_segbuf_empty(sci->sc_curseg)) { |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 2086 | nilfs_segctor_abort_construction(sci, nilfs, 1); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2087 | goto out; |
| 2088 | } |
| 2089 | |
| 2090 | err = nilfs_segctor_assign(sci, mode); |
| 2091 | if (unlikely(err)) |
| 2092 | goto failed; |
| 2093 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2094 | if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED) |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 2095 | nilfs_segctor_fill_in_file_bmap(sci); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2096 | |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 2097 | if (mode == SC_LSEG_SR && |
| 2098 | sci->sc_stage.scnt >= NILFS_ST_CPFILE) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2099 | err = nilfs_segctor_fill_in_checkpoint(sci); |
| 2100 | if (unlikely(err)) |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 2101 | goto failed_to_write; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2102 | |
| 2103 | nilfs_segctor_fill_in_super_root(sci, nilfs); |
| 2104 | } |
| 2105 | nilfs_segctor_update_segusage(sci, nilfs->ns_sufile); |
| 2106 | |
| 2107 | /* Write partial segments */ |
| 2108 | err = nilfs_segctor_prepare_write(sci, &failed_page); |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 2109 | if (err) { |
Ryusuke Konishi | 1e2b68b | 2010-03-23 01:15:31 +0900 | [diff] [blame] | 2110 | nilfs_abort_logs(&sci->sc_segbufs, failed_page, err); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2111 | goto failed_to_write; |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 2112 | } |
Ryusuke Konishi | aaed1d5 | 2010-03-23 01:50:38 +0900 | [diff] [blame] | 2113 | |
| 2114 | nilfs_add_checksums_on_logs(&sci->sc_segbufs, |
| 2115 | nilfs->ns_crc_seed); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2116 | |
Ryusuke Konishi | 9c965ba | 2009-11-29 01:17:31 +0900 | [diff] [blame] | 2117 | err = nilfs_segctor_write(sci, nilfs); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2118 | if (unlikely(err)) |
| 2119 | goto failed_to_write; |
| 2120 | |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 2121 | if (sci->sc_stage.scnt == NILFS_ST_DONE || |
| 2122 | nilfs->ns_blocksize_bits != PAGE_CACHE_SHIFT) { |
| 2123 | /* |
| 2124 | * At this point, we avoid double buffering |
| 2125 | * for blocksize < pagesize because page dirty |
| 2126 | * flag is turned off during write and dirty |
| 2127 | * buffers are not properly collected for |
| 2128 | * pages crossing over segments. |
| 2129 | */ |
| 2130 | err = nilfs_segctor_wait(sci); |
| 2131 | if (err) |
| 2132 | goto failed_to_write; |
| 2133 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2134 | } while (sci->sc_stage.scnt != NILFS_ST_DONE); |
| 2135 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2136 | out: |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2137 | nilfs_segctor_check_out_files(sci, sbi); |
| 2138 | return err; |
| 2139 | |
| 2140 | failed_to_write: |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2141 | if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED) |
| 2142 | nilfs_redirty_inodes(&sci->sc_dirty_files); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2143 | |
| 2144 | failed: |
| 2145 | if (nilfs_doing_gc()) |
| 2146 | nilfs_redirty_inodes(&sci->sc_gc_inodes); |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 2147 | nilfs_segctor_abort_construction(sci, nilfs, err); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2148 | goto out; |
| 2149 | } |
| 2150 | |
| 2151 | /** |
Ryusuke Konishi | 9ccf56c | 2010-03-14 03:01:03 +0900 | [diff] [blame] | 2152 | * nilfs_segctor_start_timer - set timer of background write |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2153 | * @sci: nilfs_sc_info |
| 2154 | * |
| 2155 | * If the timer has already been set, it ignores the new request. |
| 2156 | * This function MUST be called within a section locking the segment |
| 2157 | * semaphore. |
| 2158 | */ |
| 2159 | static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci) |
| 2160 | { |
| 2161 | spin_lock(&sci->sc_state_lock); |
Li Hong | fdce895 | 2010-04-10 23:25:39 +0800 | [diff] [blame] | 2162 | if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) { |
| 2163 | sci->sc_timer.expires = jiffies + sci->sc_interval; |
| 2164 | add_timer(&sci->sc_timer); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2165 | sci->sc_state |= NILFS_SEGCTOR_COMMIT; |
| 2166 | } |
| 2167 | spin_unlock(&sci->sc_state_lock); |
| 2168 | } |
| 2169 | |
| 2170 | static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn) |
| 2171 | { |
| 2172 | spin_lock(&sci->sc_state_lock); |
| 2173 | if (!(sci->sc_flush_request & (1 << bn))) { |
| 2174 | unsigned long prev_req = sci->sc_flush_request; |
| 2175 | |
| 2176 | sci->sc_flush_request |= (1 << bn); |
| 2177 | if (!prev_req) |
| 2178 | wake_up(&sci->sc_wait_daemon); |
| 2179 | } |
| 2180 | spin_unlock(&sci->sc_state_lock); |
| 2181 | } |
| 2182 | |
| 2183 | /** |
| 2184 | * nilfs_flush_segment - trigger a segment construction for resource control |
| 2185 | * @sb: super block |
| 2186 | * @ino: inode number of the file to be flushed out. |
| 2187 | */ |
| 2188 | void nilfs_flush_segment(struct super_block *sb, ino_t ino) |
| 2189 | { |
| 2190 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 2191 | struct nilfs_sc_info *sci = NILFS_SC(sbi); |
| 2192 | |
| 2193 | if (!sci || nilfs_doing_construction()) |
| 2194 | return; |
| 2195 | nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0); |
| 2196 | /* assign bit 0 to data files */ |
| 2197 | } |
| 2198 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2199 | struct nilfs_segctor_wait_request { |
| 2200 | wait_queue_t wq; |
| 2201 | __u32 seq; |
| 2202 | int err; |
| 2203 | atomic_t done; |
| 2204 | }; |
| 2205 | |
| 2206 | static int nilfs_segctor_sync(struct nilfs_sc_info *sci) |
| 2207 | { |
| 2208 | struct nilfs_segctor_wait_request wait_req; |
| 2209 | int err = 0; |
| 2210 | |
| 2211 | spin_lock(&sci->sc_state_lock); |
| 2212 | init_wait(&wait_req.wq); |
| 2213 | wait_req.err = 0; |
| 2214 | atomic_set(&wait_req.done, 0); |
| 2215 | wait_req.seq = ++sci->sc_seq_request; |
| 2216 | spin_unlock(&sci->sc_state_lock); |
| 2217 | |
| 2218 | init_waitqueue_entry(&wait_req.wq, current); |
| 2219 | add_wait_queue(&sci->sc_wait_request, &wait_req.wq); |
| 2220 | set_current_state(TASK_INTERRUPTIBLE); |
| 2221 | wake_up(&sci->sc_wait_daemon); |
| 2222 | |
| 2223 | for (;;) { |
| 2224 | if (atomic_read(&wait_req.done)) { |
| 2225 | err = wait_req.err; |
| 2226 | break; |
| 2227 | } |
| 2228 | if (!signal_pending(current)) { |
| 2229 | schedule(); |
| 2230 | continue; |
| 2231 | } |
| 2232 | err = -ERESTARTSYS; |
| 2233 | break; |
| 2234 | } |
| 2235 | finish_wait(&sci->sc_wait_request, &wait_req.wq); |
| 2236 | return err; |
| 2237 | } |
| 2238 | |
| 2239 | static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err) |
| 2240 | { |
| 2241 | struct nilfs_segctor_wait_request *wrq, *n; |
| 2242 | unsigned long flags; |
| 2243 | |
| 2244 | spin_lock_irqsave(&sci->sc_wait_request.lock, flags); |
| 2245 | list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.task_list, |
| 2246 | wq.task_list) { |
| 2247 | if (!atomic_read(&wrq->done) && |
| 2248 | nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) { |
| 2249 | wrq->err = err; |
| 2250 | atomic_set(&wrq->done, 1); |
| 2251 | } |
| 2252 | if (atomic_read(&wrq->done)) { |
| 2253 | wrq->wq.func(&wrq->wq, |
| 2254 | TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, |
| 2255 | 0, NULL); |
| 2256 | } |
| 2257 | } |
| 2258 | spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags); |
| 2259 | } |
| 2260 | |
| 2261 | /** |
| 2262 | * nilfs_construct_segment - construct a logical segment |
| 2263 | * @sb: super block |
| 2264 | * |
| 2265 | * Return Value: On success, 0 is retured. On errors, one of the following |
| 2266 | * negative error code is returned. |
| 2267 | * |
| 2268 | * %-EROFS - Read only filesystem. |
| 2269 | * |
| 2270 | * %-EIO - I/O error |
| 2271 | * |
| 2272 | * %-ENOSPC - No space left on device (only in a panic state). |
| 2273 | * |
| 2274 | * %-ERESTARTSYS - Interrupted. |
| 2275 | * |
| 2276 | * %-ENOMEM - Insufficient memory available. |
| 2277 | */ |
| 2278 | int nilfs_construct_segment(struct super_block *sb) |
| 2279 | { |
| 2280 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 2281 | struct nilfs_sc_info *sci = NILFS_SC(sbi); |
| 2282 | struct nilfs_transaction_info *ti; |
| 2283 | int err; |
| 2284 | |
| 2285 | if (!sci) |
| 2286 | return -EROFS; |
| 2287 | |
| 2288 | /* A call inside transactions causes a deadlock. */ |
| 2289 | BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC); |
| 2290 | |
| 2291 | err = nilfs_segctor_sync(sci); |
| 2292 | return err; |
| 2293 | } |
| 2294 | |
| 2295 | /** |
| 2296 | * nilfs_construct_dsync_segment - construct a data-only logical segment |
| 2297 | * @sb: super block |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 2298 | * @inode: inode whose data blocks should be written out |
| 2299 | * @start: start byte offset |
| 2300 | * @end: end byte offset (inclusive) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2301 | * |
| 2302 | * Return Value: On success, 0 is retured. On errors, one of the following |
| 2303 | * negative error code is returned. |
| 2304 | * |
| 2305 | * %-EROFS - Read only filesystem. |
| 2306 | * |
| 2307 | * %-EIO - I/O error |
| 2308 | * |
| 2309 | * %-ENOSPC - No space left on device (only in a panic state). |
| 2310 | * |
| 2311 | * %-ERESTARTSYS - Interrupted. |
| 2312 | * |
| 2313 | * %-ENOMEM - Insufficient memory available. |
| 2314 | */ |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 2315 | int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode, |
| 2316 | loff_t start, loff_t end) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2317 | { |
| 2318 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 2319 | struct nilfs_sc_info *sci = NILFS_SC(sbi); |
| 2320 | struct nilfs_inode_info *ii; |
| 2321 | struct nilfs_transaction_info ti; |
| 2322 | int err = 0; |
| 2323 | |
| 2324 | if (!sci) |
| 2325 | return -EROFS; |
| 2326 | |
| 2327 | nilfs_transaction_lock(sbi, &ti, 0); |
| 2328 | |
| 2329 | ii = NILFS_I(inode); |
| 2330 | if (test_bit(NILFS_I_INODE_DIRTY, &ii->i_state) || |
| 2331 | nilfs_test_opt(sbi, STRICT_ORDER) || |
| 2332 | test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) || |
| 2333 | nilfs_discontinued(sbi->s_nilfs)) { |
| 2334 | nilfs_transaction_unlock(sbi); |
| 2335 | err = nilfs_segctor_sync(sci); |
| 2336 | return err; |
| 2337 | } |
| 2338 | |
| 2339 | spin_lock(&sbi->s_inode_lock); |
| 2340 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && |
| 2341 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { |
| 2342 | spin_unlock(&sbi->s_inode_lock); |
| 2343 | nilfs_transaction_unlock(sbi); |
| 2344 | return 0; |
| 2345 | } |
| 2346 | spin_unlock(&sbi->s_inode_lock); |
Ryusuke Konishi | f30bf3e | 2009-04-06 19:01:38 -0700 | [diff] [blame] | 2347 | sci->sc_dsync_inode = ii; |
| 2348 | sci->sc_dsync_start = start; |
| 2349 | sci->sc_dsync_end = end; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2350 | |
| 2351 | err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC); |
| 2352 | |
| 2353 | nilfs_transaction_unlock(sbi); |
| 2354 | return err; |
| 2355 | } |
| 2356 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2357 | #define FLUSH_FILE_BIT (0x1) /* data file only */ |
| 2358 | #define FLUSH_DAT_BIT (1 << NILFS_DAT_INO) /* DAT only */ |
| 2359 | |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2360 | /** |
| 2361 | * nilfs_segctor_accept - record accepted sequence count of log-write requests |
| 2362 | * @sci: segment constructor object |
| 2363 | */ |
| 2364 | static void nilfs_segctor_accept(struct nilfs_sc_info *sci) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2365 | { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2366 | spin_lock(&sci->sc_state_lock); |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2367 | sci->sc_seq_accepted = sci->sc_seq_request; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2368 | spin_unlock(&sci->sc_state_lock); |
Li Hong | fdce895 | 2010-04-10 23:25:39 +0800 | [diff] [blame] | 2369 | del_timer_sync(&sci->sc_timer); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2370 | } |
| 2371 | |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2372 | /** |
| 2373 | * nilfs_segctor_notify - notify the result of request to caller threads |
| 2374 | * @sci: segment constructor object |
| 2375 | * @mode: mode of log forming |
| 2376 | * @err: error code to be notified |
| 2377 | */ |
| 2378 | static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2379 | { |
| 2380 | /* Clear requests (even when the construction failed) */ |
| 2381 | spin_lock(&sci->sc_state_lock); |
| 2382 | |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2383 | if (mode == SC_LSEG_SR) { |
Ryusuke Konishi | aeda7f6 | 2009-11-02 15:08:13 +0900 | [diff] [blame] | 2384 | sci->sc_state &= ~NILFS_SEGCTOR_COMMIT; |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2385 | sci->sc_seq_done = sci->sc_seq_accepted; |
| 2386 | nilfs_segctor_wakeup(sci, err); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2387 | sci->sc_flush_request = 0; |
Ryusuke Konishi | aeda7f6 | 2009-11-02 15:08:13 +0900 | [diff] [blame] | 2388 | } else { |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2389 | if (mode == SC_FLUSH_FILE) |
Ryusuke Konishi | aeda7f6 | 2009-11-02 15:08:13 +0900 | [diff] [blame] | 2390 | sci->sc_flush_request &= ~FLUSH_FILE_BIT; |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2391 | else if (mode == SC_FLUSH_DAT) |
Ryusuke Konishi | aeda7f6 | 2009-11-02 15:08:13 +0900 | [diff] [blame] | 2392 | sci->sc_flush_request &= ~FLUSH_DAT_BIT; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2393 | |
Ryusuke Konishi | aeda7f6 | 2009-11-02 15:08:13 +0900 | [diff] [blame] | 2394 | /* re-enable timer if checkpoint creation was not done */ |
Li Hong | fdce895 | 2010-04-10 23:25:39 +0800 | [diff] [blame] | 2395 | if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) && |
| 2396 | time_before(jiffies, sci->sc_timer.expires)) |
| 2397 | add_timer(&sci->sc_timer); |
Ryusuke Konishi | aeda7f6 | 2009-11-02 15:08:13 +0900 | [diff] [blame] | 2398 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2399 | spin_unlock(&sci->sc_state_lock); |
| 2400 | } |
| 2401 | |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2402 | /** |
| 2403 | * nilfs_segctor_construct - form logs and write them to disk |
| 2404 | * @sci: segment constructor object |
| 2405 | * @mode: mode of log forming |
| 2406 | */ |
| 2407 | static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2408 | { |
| 2409 | struct nilfs_sb_info *sbi = sci->sc_sbi; |
| 2410 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 2411 | struct nilfs_super_block **sbp; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2412 | int err = 0; |
| 2413 | |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2414 | nilfs_segctor_accept(sci); |
| 2415 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2416 | if (nilfs_discontinued(nilfs)) |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2417 | mode = SC_LSEG_SR; |
| 2418 | if (!nilfs_segctor_confirm(sci)) |
| 2419 | err = nilfs_segctor_do_construct(sci, mode); |
| 2420 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2421 | if (likely(!err)) { |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2422 | if (mode != SC_FLUSH_DAT) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2423 | atomic_set(&nilfs->ns_ndirtyblks, 0); |
| 2424 | if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) && |
| 2425 | nilfs_discontinued(nilfs)) { |
| 2426 | down_write(&nilfs->ns_sem); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 2427 | err = -EIO; |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 2428 | sbp = nilfs_prepare_super(sbi, |
| 2429 | nilfs_sb_will_flip(nilfs)); |
| 2430 | if (likely(sbp)) { |
| 2431 | nilfs_set_log_cursor(sbp[0], nilfs); |
| 2432 | err = nilfs_commit_super(sbi, NILFS_SB_COMMIT); |
| 2433 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2434 | up_write(&nilfs->ns_sem); |
| 2435 | } |
| 2436 | } |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2437 | |
| 2438 | nilfs_segctor_notify(sci, mode, err); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2439 | return err; |
| 2440 | } |
| 2441 | |
| 2442 | static void nilfs_construction_timeout(unsigned long data) |
| 2443 | { |
| 2444 | struct task_struct *p = (struct task_struct *)data; |
| 2445 | wake_up_process(p); |
| 2446 | } |
| 2447 | |
| 2448 | static void |
| 2449 | nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head) |
| 2450 | { |
| 2451 | struct nilfs_inode_info *ii, *n; |
| 2452 | |
| 2453 | list_for_each_entry_safe(ii, n, head, i_dirty) { |
| 2454 | if (!test_bit(NILFS_I_UPDATED, &ii->i_state)) |
| 2455 | continue; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2456 | list_del_init(&ii->i_dirty); |
Ryusuke Konishi | 263d90c | 2010-08-20 19:06:11 +0900 | [diff] [blame] | 2457 | iput(&ii->vfs_inode); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2458 | } |
| 2459 | } |
| 2460 | |
Ryusuke Konishi | 4f6b828 | 2009-05-10 22:41:43 +0900 | [diff] [blame] | 2461 | int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv, |
| 2462 | void **kbufs) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2463 | { |
| 2464 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 2465 | struct nilfs_sc_info *sci = NILFS_SC(sbi); |
| 2466 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 2467 | struct nilfs_transaction_info ti; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2468 | int err; |
| 2469 | |
| 2470 | if (unlikely(!sci)) |
| 2471 | return -EROFS; |
| 2472 | |
| 2473 | nilfs_transaction_lock(sbi, &ti, 1); |
| 2474 | |
Ryusuke Konishi | c1c1d7092 | 2010-08-29 12:44:56 +0900 | [diff] [blame] | 2475 | err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2476 | if (unlikely(err)) |
| 2477 | goto out_unlock; |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 2478 | |
Ryusuke Konishi | 4f6b828 | 2009-05-10 22:41:43 +0900 | [diff] [blame] | 2479 | err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs); |
Ryusuke Konishi | c1c1d7092 | 2010-08-29 12:44:56 +0900 | [diff] [blame] | 2480 | if (unlikely(err)) { |
| 2481 | nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2482 | goto out_unlock; |
Ryusuke Konishi | c1c1d7092 | 2010-08-29 12:44:56 +0900 | [diff] [blame] | 2483 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2484 | |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 2485 | sci->sc_freesegs = kbufs[4]; |
| 2486 | sci->sc_nfreesegs = argv[4].v_nmembs; |
Ryusuke Konishi | 0935db7 | 2009-11-29 02:39:11 +0900 | [diff] [blame] | 2487 | list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2488 | |
| 2489 | for (;;) { |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2490 | err = nilfs_segctor_construct(sci, SC_LSEG_SR); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2491 | nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2492 | |
| 2493 | if (likely(!err)) |
| 2494 | break; |
| 2495 | |
| 2496 | nilfs_warning(sb, __func__, |
| 2497 | "segment construction failed. (err=%d)", err); |
| 2498 | set_current_state(TASK_INTERRUPTIBLE); |
| 2499 | schedule_timeout(sci->sc_interval); |
| 2500 | } |
Jiro SEKIBA | e902ec9 | 2010-01-30 18:06:35 +0900 | [diff] [blame] | 2501 | if (nilfs_test_opt(sbi, DISCARD)) { |
| 2502 | int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs, |
| 2503 | sci->sc_nfreesegs); |
| 2504 | if (ret) { |
| 2505 | printk(KERN_WARNING |
| 2506 | "NILFS warning: error %d on discard request, " |
| 2507 | "turning discards off for the device\n", ret); |
| 2508 | nilfs_clear_opt(sbi, DISCARD); |
| 2509 | } |
| 2510 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2511 | |
| 2512 | out_unlock: |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 2513 | sci->sc_freesegs = NULL; |
| 2514 | sci->sc_nfreesegs = 0; |
Ryusuke Konishi | c1c1d7092 | 2010-08-29 12:44:56 +0900 | [diff] [blame] | 2515 | nilfs_mdt_clear_shadow_map(nilfs->ns_dat); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2516 | nilfs_transaction_unlock(sbi); |
| 2517 | return err; |
| 2518 | } |
| 2519 | |
| 2520 | static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode) |
| 2521 | { |
| 2522 | struct nilfs_sb_info *sbi = sci->sc_sbi; |
| 2523 | struct nilfs_transaction_info ti; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2524 | |
| 2525 | nilfs_transaction_lock(sbi, &ti, 0); |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2526 | nilfs_segctor_construct(sci, mode); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2527 | |
| 2528 | /* |
| 2529 | * Unclosed segment should be retried. We do this using sc_timer. |
| 2530 | * Timeout of sc_timer will invoke complete construction which leads |
| 2531 | * to close the current logical segment. |
| 2532 | */ |
| 2533 | if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) |
| 2534 | nilfs_segctor_start_timer(sci); |
| 2535 | |
| 2536 | nilfs_transaction_unlock(sbi); |
| 2537 | } |
| 2538 | |
| 2539 | static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci) |
| 2540 | { |
| 2541 | int mode = 0; |
| 2542 | int err; |
| 2543 | |
| 2544 | spin_lock(&sci->sc_state_lock); |
| 2545 | mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ? |
| 2546 | SC_FLUSH_DAT : SC_FLUSH_FILE; |
| 2547 | spin_unlock(&sci->sc_state_lock); |
| 2548 | |
| 2549 | if (mode) { |
| 2550 | err = nilfs_segctor_do_construct(sci, mode); |
| 2551 | |
| 2552 | spin_lock(&sci->sc_state_lock); |
| 2553 | sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ? |
| 2554 | ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT; |
| 2555 | spin_unlock(&sci->sc_state_lock); |
| 2556 | } |
| 2557 | clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags); |
| 2558 | } |
| 2559 | |
| 2560 | static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci) |
| 2561 | { |
| 2562 | if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) || |
| 2563 | time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) { |
| 2564 | if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT)) |
| 2565 | return SC_FLUSH_FILE; |
| 2566 | else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT)) |
| 2567 | return SC_FLUSH_DAT; |
| 2568 | } |
| 2569 | return SC_LSEG_SR; |
| 2570 | } |
| 2571 | |
| 2572 | /** |
| 2573 | * nilfs_segctor_thread - main loop of the segment constructor thread. |
| 2574 | * @arg: pointer to a struct nilfs_sc_info. |
| 2575 | * |
| 2576 | * nilfs_segctor_thread() initializes a timer and serves as a daemon |
| 2577 | * to execute segment constructions. |
| 2578 | */ |
| 2579 | static int nilfs_segctor_thread(void *arg) |
| 2580 | { |
| 2581 | struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg; |
Ryusuke Konishi | e605f0a | 2009-12-09 00:57:52 +0900 | [diff] [blame] | 2582 | struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2583 | int timeout = 0; |
| 2584 | |
Li Hong | fdce895 | 2010-04-10 23:25:39 +0800 | [diff] [blame] | 2585 | sci->sc_timer.data = (unsigned long)current; |
| 2586 | sci->sc_timer.function = nilfs_construction_timeout; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2587 | |
| 2588 | /* start sync. */ |
| 2589 | sci->sc_task = current; |
| 2590 | wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */ |
| 2591 | printk(KERN_INFO |
| 2592 | "segctord starting. Construction interval = %lu seconds, " |
| 2593 | "CP frequency < %lu seconds\n", |
| 2594 | sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ); |
| 2595 | |
| 2596 | spin_lock(&sci->sc_state_lock); |
| 2597 | loop: |
| 2598 | for (;;) { |
| 2599 | int mode; |
| 2600 | |
| 2601 | if (sci->sc_state & NILFS_SEGCTOR_QUIT) |
| 2602 | goto end_thread; |
| 2603 | |
| 2604 | if (timeout || sci->sc_seq_request != sci->sc_seq_done) |
| 2605 | mode = SC_LSEG_SR; |
| 2606 | else if (!sci->sc_flush_request) |
| 2607 | break; |
| 2608 | else |
| 2609 | mode = nilfs_segctor_flush_mode(sci); |
| 2610 | |
| 2611 | spin_unlock(&sci->sc_state_lock); |
| 2612 | nilfs_segctor_thread_construct(sci, mode); |
| 2613 | spin_lock(&sci->sc_state_lock); |
| 2614 | timeout = 0; |
| 2615 | } |
| 2616 | |
| 2617 | |
| 2618 | if (freezing(current)) { |
| 2619 | spin_unlock(&sci->sc_state_lock); |
| 2620 | refrigerator(); |
| 2621 | spin_lock(&sci->sc_state_lock); |
| 2622 | } else { |
| 2623 | DEFINE_WAIT(wait); |
| 2624 | int should_sleep = 1; |
| 2625 | |
| 2626 | prepare_to_wait(&sci->sc_wait_daemon, &wait, |
| 2627 | TASK_INTERRUPTIBLE); |
| 2628 | |
| 2629 | if (sci->sc_seq_request != sci->sc_seq_done) |
| 2630 | should_sleep = 0; |
| 2631 | else if (sci->sc_flush_request) |
| 2632 | should_sleep = 0; |
| 2633 | else if (sci->sc_state & NILFS_SEGCTOR_COMMIT) |
| 2634 | should_sleep = time_before(jiffies, |
Li Hong | fdce895 | 2010-04-10 23:25:39 +0800 | [diff] [blame] | 2635 | sci->sc_timer.expires); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2636 | |
| 2637 | if (should_sleep) { |
| 2638 | spin_unlock(&sci->sc_state_lock); |
| 2639 | schedule(); |
| 2640 | spin_lock(&sci->sc_state_lock); |
| 2641 | } |
| 2642 | finish_wait(&sci->sc_wait_daemon, &wait); |
| 2643 | timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) && |
Li Hong | fdce895 | 2010-04-10 23:25:39 +0800 | [diff] [blame] | 2644 | time_after_eq(jiffies, sci->sc_timer.expires)); |
Ryusuke Konishi | e605f0a | 2009-12-09 00:57:52 +0900 | [diff] [blame] | 2645 | |
| 2646 | if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs)) |
Jiro SEKIBA | 1dfa271 | 2009-07-23 01:33:49 +0900 | [diff] [blame] | 2647 | set_nilfs_discontinued(nilfs); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2648 | } |
| 2649 | goto loop; |
| 2650 | |
| 2651 | end_thread: |
| 2652 | spin_unlock(&sci->sc_state_lock); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2653 | |
| 2654 | /* end sync. */ |
| 2655 | sci->sc_task = NULL; |
| 2656 | wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */ |
| 2657 | return 0; |
| 2658 | } |
| 2659 | |
| 2660 | static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci) |
| 2661 | { |
| 2662 | struct task_struct *t; |
| 2663 | |
| 2664 | t = kthread_run(nilfs_segctor_thread, sci, "segctord"); |
| 2665 | if (IS_ERR(t)) { |
| 2666 | int err = PTR_ERR(t); |
| 2667 | |
| 2668 | printk(KERN_ERR "NILFS: error %d creating segctord thread\n", |
| 2669 | err); |
| 2670 | return err; |
| 2671 | } |
| 2672 | wait_event(sci->sc_wait_task, sci->sc_task != NULL); |
| 2673 | return 0; |
| 2674 | } |
| 2675 | |
| 2676 | static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci) |
Jiro SEKIBA | 6b81e14 | 2010-10-14 13:52:00 +0900 | [diff] [blame] | 2677 | __acquires(&sci->sc_state_lock) |
| 2678 | __releases(&sci->sc_state_lock) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2679 | { |
| 2680 | sci->sc_state |= NILFS_SEGCTOR_QUIT; |
| 2681 | |
| 2682 | while (sci->sc_task) { |
| 2683 | wake_up(&sci->sc_wait_daemon); |
| 2684 | spin_unlock(&sci->sc_state_lock); |
| 2685 | wait_event(sci->sc_wait_task, sci->sc_task == NULL); |
| 2686 | spin_lock(&sci->sc_state_lock); |
| 2687 | } |
| 2688 | } |
| 2689 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2690 | /* |
| 2691 | * Setup & clean-up functions |
| 2692 | */ |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 2693 | static struct nilfs_sc_info *nilfs_segctor_new(struct nilfs_sb_info *sbi, |
| 2694 | struct nilfs_root *root) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2695 | { |
| 2696 | struct nilfs_sc_info *sci; |
| 2697 | |
| 2698 | sci = kzalloc(sizeof(*sci), GFP_KERNEL); |
| 2699 | if (!sci) |
| 2700 | return NULL; |
| 2701 | |
| 2702 | sci->sc_sbi = sbi; |
| 2703 | sci->sc_super = sbi->s_super; |
| 2704 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 2705 | nilfs_get_root(root); |
| 2706 | sci->sc_root = root; |
| 2707 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2708 | init_waitqueue_head(&sci->sc_wait_request); |
| 2709 | init_waitqueue_head(&sci->sc_wait_daemon); |
| 2710 | init_waitqueue_head(&sci->sc_wait_task); |
| 2711 | spin_lock_init(&sci->sc_state_lock); |
| 2712 | INIT_LIST_HEAD(&sci->sc_dirty_files); |
| 2713 | INIT_LIST_HEAD(&sci->sc_segbufs); |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 2714 | INIT_LIST_HEAD(&sci->sc_write_logs); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2715 | INIT_LIST_HEAD(&sci->sc_gc_inodes); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2716 | INIT_LIST_HEAD(&sci->sc_copied_buffers); |
Li Hong | fdce895 | 2010-04-10 23:25:39 +0800 | [diff] [blame] | 2717 | init_timer(&sci->sc_timer); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2718 | |
| 2719 | sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT; |
| 2720 | sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ; |
| 2721 | sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK; |
| 2722 | |
| 2723 | if (sbi->s_interval) |
| 2724 | sci->sc_interval = sbi->s_interval; |
| 2725 | if (sbi->s_watermark) |
| 2726 | sci->sc_watermark = sbi->s_watermark; |
| 2727 | return sci; |
| 2728 | } |
| 2729 | |
| 2730 | static void nilfs_segctor_write_out(struct nilfs_sc_info *sci) |
| 2731 | { |
| 2732 | int ret, retrycount = NILFS_SC_CLEANUP_RETRY; |
| 2733 | |
| 2734 | /* The segctord thread was stopped and its timer was removed. |
| 2735 | But some tasks remain. */ |
| 2736 | do { |
| 2737 | struct nilfs_sb_info *sbi = sci->sc_sbi; |
| 2738 | struct nilfs_transaction_info ti; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2739 | |
| 2740 | nilfs_transaction_lock(sbi, &ti, 0); |
Ryusuke Konishi | dcd7618 | 2010-01-26 15:20:15 +0900 | [diff] [blame] | 2741 | ret = nilfs_segctor_construct(sci, SC_LSEG_SR); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2742 | nilfs_transaction_unlock(sbi); |
| 2743 | |
| 2744 | } while (ret && retrycount-- > 0); |
| 2745 | } |
| 2746 | |
| 2747 | /** |
| 2748 | * nilfs_segctor_destroy - destroy the segment constructor. |
| 2749 | * @sci: nilfs_sc_info |
| 2750 | * |
| 2751 | * nilfs_segctor_destroy() kills the segctord thread and frees |
| 2752 | * the nilfs_sc_info struct. |
| 2753 | * Caller must hold the segment semaphore. |
| 2754 | */ |
| 2755 | static void nilfs_segctor_destroy(struct nilfs_sc_info *sci) |
| 2756 | { |
| 2757 | struct nilfs_sb_info *sbi = sci->sc_sbi; |
| 2758 | int flag; |
| 2759 | |
| 2760 | up_write(&sbi->s_nilfs->ns_segctor_sem); |
| 2761 | |
| 2762 | spin_lock(&sci->sc_state_lock); |
| 2763 | nilfs_segctor_kill_thread(sci); |
| 2764 | flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request |
| 2765 | || sci->sc_seq_request != sci->sc_seq_done); |
| 2766 | spin_unlock(&sci->sc_state_lock); |
| 2767 | |
Ryusuke Konishi | 3256a05 | 2010-01-31 12:39:50 +0900 | [diff] [blame] | 2768 | if (flag || !nilfs_segctor_confirm(sci)) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2769 | nilfs_segctor_write_out(sci); |
| 2770 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2771 | WARN_ON(!list_empty(&sci->sc_copied_buffers)); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2772 | |
| 2773 | if (!list_empty(&sci->sc_dirty_files)) { |
| 2774 | nilfs_warning(sbi->s_super, __func__, |
| 2775 | "dirty file(s) after the final construction\n"); |
| 2776 | nilfs_dispose_list(sbi, &sci->sc_dirty_files, 1); |
| 2777 | } |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2778 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2779 | WARN_ON(!list_empty(&sci->sc_segbufs)); |
Ryusuke Konishi | a694291a | 2009-11-29 23:03:04 +0900 | [diff] [blame] | 2780 | WARN_ON(!list_empty(&sci->sc_write_logs)); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2781 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 2782 | nilfs_put_root(sci->sc_root); |
| 2783 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2784 | down_write(&sbi->s_nilfs->ns_segctor_sem); |
| 2785 | |
Li Hong | fdce895 | 2010-04-10 23:25:39 +0800 | [diff] [blame] | 2786 | del_timer_sync(&sci->sc_timer); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2787 | kfree(sci); |
| 2788 | } |
| 2789 | |
| 2790 | /** |
| 2791 | * nilfs_attach_segment_constructor - attach a segment constructor |
| 2792 | * @sbi: nilfs_sb_info |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 2793 | * @root: root object of the current filesystem tree |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2794 | * |
| 2795 | * nilfs_attach_segment_constructor() allocates a struct nilfs_sc_info, |
Ryusuke Konishi | 7a65004 | 2010-03-14 03:32:40 +0900 | [diff] [blame] | 2796 | * initializes it, and starts the segment constructor. |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2797 | * |
| 2798 | * Return Value: On success, 0 is returned. On error, one of the following |
| 2799 | * negative error code is returned. |
| 2800 | * |
| 2801 | * %-ENOMEM - Insufficient memory available. |
| 2802 | */ |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 2803 | int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi, |
| 2804 | struct nilfs_root *root) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2805 | { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2806 | int err; |
| 2807 | |
Ryusuke Konishi | fe5f171 | 2010-01-31 19:46:40 +0900 | [diff] [blame] | 2808 | if (NILFS_SC(sbi)) { |
| 2809 | /* |
| 2810 | * This happens if the filesystem was remounted |
| 2811 | * read/write after nilfs_error degenerated it into a |
| 2812 | * read-only mount. |
| 2813 | */ |
| 2814 | nilfs_detach_segment_constructor(sbi); |
| 2815 | } |
| 2816 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 2817 | sbi->s_sc_info = nilfs_segctor_new(sbi, root); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2818 | if (!sbi->s_sc_info) |
| 2819 | return -ENOMEM; |
| 2820 | |
Li Hong | 154ac5a | 2010-04-10 21:57:11 +0800 | [diff] [blame] | 2821 | err = nilfs_segctor_start_thread(NILFS_SC(sbi)); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2822 | if (err) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2823 | kfree(sbi->s_sc_info); |
| 2824 | sbi->s_sc_info = NULL; |
| 2825 | } |
| 2826 | return err; |
| 2827 | } |
| 2828 | |
| 2829 | /** |
| 2830 | * nilfs_detach_segment_constructor - destroy the segment constructor |
| 2831 | * @sbi: nilfs_sb_info |
| 2832 | * |
| 2833 | * nilfs_detach_segment_constructor() kills the segment constructor daemon, |
| 2834 | * frees the struct nilfs_sc_info, and destroy the dirty file list. |
| 2835 | */ |
| 2836 | void nilfs_detach_segment_constructor(struct nilfs_sb_info *sbi) |
| 2837 | { |
| 2838 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 2839 | LIST_HEAD(garbage_list); |
| 2840 | |
| 2841 | down_write(&nilfs->ns_segctor_sem); |
| 2842 | if (NILFS_SC(sbi)) { |
| 2843 | nilfs_segctor_destroy(NILFS_SC(sbi)); |
| 2844 | sbi->s_sc_info = NULL; |
| 2845 | } |
| 2846 | |
| 2847 | /* Force to free the list of dirty files */ |
| 2848 | spin_lock(&sbi->s_inode_lock); |
| 2849 | if (!list_empty(&sbi->s_dirty_files)) { |
| 2850 | list_splice_init(&sbi->s_dirty_files, &garbage_list); |
| 2851 | nilfs_warning(sbi->s_super, __func__, |
| 2852 | "Non empty dirty list after the last " |
| 2853 | "segment construction\n"); |
| 2854 | } |
| 2855 | spin_unlock(&sbi->s_inode_lock); |
| 2856 | up_write(&nilfs->ns_segctor_sem); |
| 2857 | |
| 2858 | nilfs_dispose_list(sbi, &garbage_list, 1); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 2859 | } |