Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 19 | #include <linux/fs.h> |
| 20 | #include <linux/pagemap.h> |
| 21 | #include <linux/highmem.h> |
| 22 | #include <linux/time.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/string.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 25 | #include <linux/backing-dev.h> |
| 26 | #include <linux/mpage.h> |
Kent Overstreet | a27bb33 | 2013-05-07 16:19:08 -0700 | [diff] [blame] | 27 | #include <linux/aio.h> |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 28 | #include <linux/falloc.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 29 | #include <linux/swap.h> |
| 30 | #include <linux/writeback.h> |
| 31 | #include <linux/statfs.h> |
| 32 | #include <linux/compat.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 33 | #include <linux/slab.h> |
Filipe Brandenburger | 55e301f | 2013-01-29 06:04:50 +0000 | [diff] [blame] | 34 | #include <linux/btrfs.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 35 | #include "ctree.h" |
| 36 | #include "disk-io.h" |
| 37 | #include "transaction.h" |
| 38 | #include "btrfs_inode.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 39 | #include "print-tree.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 40 | #include "tree-log.h" |
| 41 | #include "locking.h" |
Jeff Mahoney | 12fa8ec | 2008-05-02 15:03:58 -0400 | [diff] [blame] | 42 | #include "compat.h" |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 43 | #include "volumes.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 44 | |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 45 | static struct kmem_cache *btrfs_inode_defrag_cachep; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 46 | /* |
| 47 | * when auto defrag is enabled we |
| 48 | * queue up these defrag structs to remember which |
| 49 | * inodes need defragging passes |
| 50 | */ |
| 51 | struct inode_defrag { |
| 52 | struct rb_node rb_node; |
| 53 | /* objectid */ |
| 54 | u64 ino; |
| 55 | /* |
| 56 | * transid where the defrag was added, we search for |
| 57 | * extents newer than this |
| 58 | */ |
| 59 | u64 transid; |
| 60 | |
| 61 | /* root objectid */ |
| 62 | u64 root; |
| 63 | |
| 64 | /* last offset we were able to defrag */ |
| 65 | u64 last_offset; |
| 66 | |
| 67 | /* if we've wrapped around back to zero once already */ |
| 68 | int cycled; |
| 69 | }; |
| 70 | |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 71 | static int __compare_inode_defrag(struct inode_defrag *defrag1, |
| 72 | struct inode_defrag *defrag2) |
| 73 | { |
| 74 | if (defrag1->root > defrag2->root) |
| 75 | return 1; |
| 76 | else if (defrag1->root < defrag2->root) |
| 77 | return -1; |
| 78 | else if (defrag1->ino > defrag2->ino) |
| 79 | return 1; |
| 80 | else if (defrag1->ino < defrag2->ino) |
| 81 | return -1; |
| 82 | else |
| 83 | return 0; |
| 84 | } |
| 85 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 86 | /* pop a record for an inode into the defrag tree. The lock |
| 87 | * must be held already |
| 88 | * |
| 89 | * If you're inserting a record for an older transid than an |
| 90 | * existing record, the transid already in the tree is lowered |
| 91 | * |
| 92 | * If an existing record is found the defrag item you |
| 93 | * pass in is freed |
| 94 | */ |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 95 | static int __btrfs_add_inode_defrag(struct inode *inode, |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 96 | struct inode_defrag *defrag) |
| 97 | { |
| 98 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 99 | struct inode_defrag *entry; |
| 100 | struct rb_node **p; |
| 101 | struct rb_node *parent = NULL; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 102 | int ret; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 103 | |
| 104 | p = &root->fs_info->defrag_inodes.rb_node; |
| 105 | while (*p) { |
| 106 | parent = *p; |
| 107 | entry = rb_entry(parent, struct inode_defrag, rb_node); |
| 108 | |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 109 | ret = __compare_inode_defrag(defrag, entry); |
| 110 | if (ret < 0) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 111 | p = &parent->rb_left; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 112 | else if (ret > 0) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 113 | p = &parent->rb_right; |
| 114 | else { |
| 115 | /* if we're reinserting an entry for |
| 116 | * an old defrag run, make sure to |
| 117 | * lower the transid of our existing record |
| 118 | */ |
| 119 | if (defrag->transid < entry->transid) |
| 120 | entry->transid = defrag->transid; |
| 121 | if (defrag->last_offset > entry->last_offset) |
| 122 | entry->last_offset = defrag->last_offset; |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 123 | return -EEXIST; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 124 | } |
| 125 | } |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 126 | set_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 127 | rb_link_node(&defrag->rb_node, parent, p); |
| 128 | rb_insert_color(&defrag->rb_node, &root->fs_info->defrag_inodes); |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 129 | return 0; |
| 130 | } |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 131 | |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 132 | static inline int __need_auto_defrag(struct btrfs_root *root) |
| 133 | { |
| 134 | if (!btrfs_test_opt(root, AUTO_DEFRAG)) |
| 135 | return 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 136 | |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 137 | if (btrfs_fs_closing(root->fs_info)) |
| 138 | return 0; |
| 139 | |
| 140 | return 1; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | /* |
| 144 | * insert a defrag record for this inode if auto defrag is |
| 145 | * enabled |
| 146 | */ |
| 147 | int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, |
| 148 | struct inode *inode) |
| 149 | { |
| 150 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 151 | struct inode_defrag *defrag; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 152 | u64 transid; |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 153 | int ret; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 154 | |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 155 | if (!__need_auto_defrag(root)) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 156 | return 0; |
| 157 | |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 158 | if (test_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags)) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 159 | return 0; |
| 160 | |
| 161 | if (trans) |
| 162 | transid = trans->transid; |
| 163 | else |
| 164 | transid = BTRFS_I(inode)->root->last_trans; |
| 165 | |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 166 | defrag = kmem_cache_zalloc(btrfs_inode_defrag_cachep, GFP_NOFS); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 167 | if (!defrag) |
| 168 | return -ENOMEM; |
| 169 | |
David Sterba | a4689d2 | 2011-05-31 17:08:14 +0000 | [diff] [blame] | 170 | defrag->ino = btrfs_ino(inode); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 171 | defrag->transid = transid; |
| 172 | defrag->root = root->root_key.objectid; |
| 173 | |
| 174 | spin_lock(&root->fs_info->defrag_inodes_lock); |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 175 | if (!test_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags)) { |
| 176 | /* |
| 177 | * If we set IN_DEFRAG flag and evict the inode from memory, |
| 178 | * and then re-read this inode, this new inode doesn't have |
| 179 | * IN_DEFRAG flag. At the case, we may find the existed defrag. |
| 180 | */ |
| 181 | ret = __btrfs_add_inode_defrag(inode, defrag); |
| 182 | if (ret) |
| 183 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
| 184 | } else { |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 185 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 186 | } |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 187 | spin_unlock(&root->fs_info->defrag_inodes_lock); |
Wanlong Gao | a0f98dd | 2011-07-18 12:19:35 +0000 | [diff] [blame] | 188 | return 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | /* |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 192 | * Requeue the defrag object. If there is a defrag object that points to |
| 193 | * the same inode in the tree, we will merge them together (by |
| 194 | * __btrfs_add_inode_defrag()) and free the one that we want to requeue. |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 195 | */ |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 196 | static void btrfs_requeue_inode_defrag(struct inode *inode, |
| 197 | struct inode_defrag *defrag) |
Miao Xie | 8ddc473 | 2012-11-26 09:25:38 +0000 | [diff] [blame] | 198 | { |
| 199 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 200 | int ret; |
| 201 | |
| 202 | if (!__need_auto_defrag(root)) |
| 203 | goto out; |
| 204 | |
| 205 | /* |
| 206 | * Here we don't check the IN_DEFRAG flag, because we need merge |
| 207 | * them together. |
| 208 | */ |
| 209 | spin_lock(&root->fs_info->defrag_inodes_lock); |
| 210 | ret = __btrfs_add_inode_defrag(inode, defrag); |
| 211 | spin_unlock(&root->fs_info->defrag_inodes_lock); |
| 212 | if (ret) |
| 213 | goto out; |
| 214 | return; |
| 215 | out: |
| 216 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
| 217 | } |
| 218 | |
| 219 | /* |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 220 | * pick the defragable inode that we want, if it doesn't exist, we will get |
| 221 | * the next one. |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 222 | */ |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 223 | static struct inode_defrag * |
| 224 | btrfs_pick_defrag_inode(struct btrfs_fs_info *fs_info, u64 root, u64 ino) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 225 | { |
| 226 | struct inode_defrag *entry = NULL; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 227 | struct inode_defrag tmp; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 228 | struct rb_node *p; |
| 229 | struct rb_node *parent = NULL; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 230 | int ret; |
| 231 | |
| 232 | tmp.ino = ino; |
| 233 | tmp.root = root; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 234 | |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 235 | spin_lock(&fs_info->defrag_inodes_lock); |
| 236 | p = fs_info->defrag_inodes.rb_node; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 237 | while (p) { |
| 238 | parent = p; |
| 239 | entry = rb_entry(parent, struct inode_defrag, rb_node); |
| 240 | |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 241 | ret = __compare_inode_defrag(&tmp, entry); |
| 242 | if (ret < 0) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 243 | p = parent->rb_left; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 244 | else if (ret > 0) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 245 | p = parent->rb_right; |
| 246 | else |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 247 | goto out; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 248 | } |
| 249 | |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 250 | if (parent && __compare_inode_defrag(&tmp, entry) > 0) { |
| 251 | parent = rb_next(parent); |
| 252 | if (parent) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 253 | entry = rb_entry(parent, struct inode_defrag, rb_node); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 254 | else |
| 255 | entry = NULL; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 256 | } |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 257 | out: |
| 258 | if (entry) |
| 259 | rb_erase(parent, &fs_info->defrag_inodes); |
| 260 | spin_unlock(&fs_info->defrag_inodes_lock); |
| 261 | return entry; |
| 262 | } |
| 263 | |
| 264 | void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info) |
| 265 | { |
| 266 | struct inode_defrag *defrag; |
| 267 | struct rb_node *node; |
| 268 | |
| 269 | spin_lock(&fs_info->defrag_inodes_lock); |
| 270 | node = rb_first(&fs_info->defrag_inodes); |
| 271 | while (node) { |
| 272 | rb_erase(node, &fs_info->defrag_inodes); |
| 273 | defrag = rb_entry(node, struct inode_defrag, rb_node); |
| 274 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
| 275 | |
| 276 | if (need_resched()) { |
| 277 | spin_unlock(&fs_info->defrag_inodes_lock); |
| 278 | cond_resched(); |
| 279 | spin_lock(&fs_info->defrag_inodes_lock); |
| 280 | } |
| 281 | |
| 282 | node = rb_first(&fs_info->defrag_inodes); |
| 283 | } |
| 284 | spin_unlock(&fs_info->defrag_inodes_lock); |
| 285 | } |
| 286 | |
| 287 | #define BTRFS_DEFRAG_BATCH 1024 |
| 288 | |
| 289 | static int __btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info, |
| 290 | struct inode_defrag *defrag) |
| 291 | { |
| 292 | struct btrfs_root *inode_root; |
| 293 | struct inode *inode; |
| 294 | struct btrfs_key key; |
| 295 | struct btrfs_ioctl_defrag_range_args range; |
| 296 | int num_defrag; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 297 | int index; |
| 298 | int ret; |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 299 | |
| 300 | /* get the inode */ |
| 301 | key.objectid = defrag->root; |
| 302 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
| 303 | key.offset = (u64)-1; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 304 | |
| 305 | index = srcu_read_lock(&fs_info->subvol_srcu); |
| 306 | |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 307 | inode_root = btrfs_read_fs_root_no_name(fs_info, &key); |
| 308 | if (IS_ERR(inode_root)) { |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 309 | ret = PTR_ERR(inode_root); |
| 310 | goto cleanup; |
| 311 | } |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 312 | |
| 313 | key.objectid = defrag->ino; |
| 314 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
| 315 | key.offset = 0; |
| 316 | inode = btrfs_iget(fs_info->sb, &key, inode_root, NULL); |
| 317 | if (IS_ERR(inode)) { |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 318 | ret = PTR_ERR(inode); |
| 319 | goto cleanup; |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 320 | } |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 321 | srcu_read_unlock(&fs_info->subvol_srcu, index); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 322 | |
| 323 | /* do a chunk of defrag */ |
| 324 | clear_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags); |
| 325 | memset(&range, 0, sizeof(range)); |
| 326 | range.len = (u64)-1; |
| 327 | range.start = defrag->last_offset; |
Miao Xie | b66f00d | 2012-11-26 09:27:29 +0000 | [diff] [blame] | 328 | |
| 329 | sb_start_write(fs_info->sb); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 330 | num_defrag = btrfs_defrag_file(inode, NULL, &range, defrag->transid, |
| 331 | BTRFS_DEFRAG_BATCH); |
Miao Xie | b66f00d | 2012-11-26 09:27:29 +0000 | [diff] [blame] | 332 | sb_end_write(fs_info->sb); |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 333 | /* |
| 334 | * if we filled the whole defrag batch, there |
| 335 | * must be more work to do. Queue this defrag |
| 336 | * again |
| 337 | */ |
| 338 | if (num_defrag == BTRFS_DEFRAG_BATCH) { |
| 339 | defrag->last_offset = range.start; |
| 340 | btrfs_requeue_inode_defrag(inode, defrag); |
| 341 | } else if (defrag->last_offset && !defrag->cycled) { |
| 342 | /* |
| 343 | * we didn't fill our defrag batch, but |
| 344 | * we didn't start at zero. Make sure we loop |
| 345 | * around to the start of the file. |
| 346 | */ |
| 347 | defrag->last_offset = 0; |
| 348 | defrag->cycled = 1; |
| 349 | btrfs_requeue_inode_defrag(inode, defrag); |
| 350 | } else { |
| 351 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
| 352 | } |
| 353 | |
| 354 | iput(inode); |
| 355 | return 0; |
Liu Bo | 6f1c360 | 2013-01-29 03:22:10 +0000 | [diff] [blame] | 356 | cleanup: |
| 357 | srcu_read_unlock(&fs_info->subvol_srcu, index); |
| 358 | kmem_cache_free(btrfs_inode_defrag_cachep, defrag); |
| 359 | return ret; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 360 | } |
| 361 | |
| 362 | /* |
| 363 | * run through the list of inodes in the FS that need |
| 364 | * defragging |
| 365 | */ |
| 366 | int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info) |
| 367 | { |
| 368 | struct inode_defrag *defrag; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 369 | u64 first_ino = 0; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 370 | u64 root_objectid = 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 371 | |
| 372 | atomic_inc(&fs_info->defrag_running); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 373 | while(1) { |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 374 | /* Pause the auto defragger. */ |
| 375 | if (test_bit(BTRFS_FS_STATE_REMOUNTING, |
| 376 | &fs_info->fs_state)) |
| 377 | break; |
| 378 | |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 379 | if (!__need_auto_defrag(fs_info->tree_root)) |
| 380 | break; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 381 | |
| 382 | /* find an inode to defrag */ |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 383 | defrag = btrfs_pick_defrag_inode(fs_info, root_objectid, |
| 384 | first_ino); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 385 | if (!defrag) { |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 386 | if (root_objectid || first_ino) { |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 387 | root_objectid = 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 388 | first_ino = 0; |
| 389 | continue; |
| 390 | } else { |
| 391 | break; |
| 392 | } |
| 393 | } |
| 394 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 395 | first_ino = defrag->ino + 1; |
Miao Xie | 762f226 | 2012-05-24 18:58:27 +0800 | [diff] [blame] | 396 | root_objectid = defrag->root; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 397 | |
Miao Xie | 26176e7 | 2012-11-26 09:26:20 +0000 | [diff] [blame] | 398 | __btrfs_run_defrag_inode(fs_info, defrag); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 399 | } |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 400 | atomic_dec(&fs_info->defrag_running); |
| 401 | |
| 402 | /* |
| 403 | * during unmount, we use the transaction_wait queue to |
| 404 | * wait for the defragger to stop |
| 405 | */ |
| 406 | wake_up(&fs_info->transaction_wait); |
| 407 | return 0; |
| 408 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 409 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 410 | /* simple helper to fault in pages and copy. This should go away |
| 411 | * and be replaced with calls into generic code. |
| 412 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 413 | static noinline int btrfs_copy_from_user(loff_t pos, int num_pages, |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 414 | size_t write_bytes, |
Chris Mason | a1b32a5 | 2008-09-05 16:09:51 -0400 | [diff] [blame] | 415 | struct page **prepared_pages, |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 416 | struct iov_iter *i) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 417 | { |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 418 | size_t copied = 0; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 419 | size_t total_copied = 0; |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 420 | int pg = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 421 | int offset = pos & (PAGE_CACHE_SIZE - 1); |
| 422 | |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 423 | while (write_bytes > 0) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 424 | size_t count = min_t(size_t, |
| 425 | PAGE_CACHE_SIZE - offset, write_bytes); |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 426 | struct page *page = prepared_pages[pg]; |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 427 | /* |
| 428 | * Copy data from userspace to the current page |
| 429 | * |
| 430 | * Disable pagefault to avoid recursive lock since |
| 431 | * the pages are already locked |
| 432 | */ |
| 433 | pagefault_disable(); |
| 434 | copied = iov_iter_copy_from_user_atomic(page, i, offset, count); |
| 435 | pagefault_enable(); |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 436 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 437 | /* Flush processor's dcache for this page */ |
| 438 | flush_dcache_page(page); |
Chris Mason | 31339ac | 2011-03-07 11:10:24 -0500 | [diff] [blame] | 439 | |
| 440 | /* |
| 441 | * if we get a partial write, we can end up with |
| 442 | * partially up to date pages. These add |
| 443 | * a lot of complexity, so make sure they don't |
| 444 | * happen by forcing this copy to be retried. |
| 445 | * |
| 446 | * The rest of the btrfs_file_write code will fall |
| 447 | * back to page at a time copies after we return 0. |
| 448 | */ |
| 449 | if (!PageUptodate(page) && copied < count) |
| 450 | copied = 0; |
| 451 | |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 452 | iov_iter_advance(i, copied); |
| 453 | write_bytes -= copied; |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 454 | total_copied += copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 455 | |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 456 | /* Return to btrfs_file_aio_write to fault page */ |
Josef Bacik | 9f570b8 | 2011-01-25 12:42:37 -0500 | [diff] [blame] | 457 | if (unlikely(copied == 0)) |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 458 | break; |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 459 | |
| 460 | if (unlikely(copied < PAGE_CACHE_SIZE - offset)) { |
| 461 | offset += copied; |
| 462 | } else { |
| 463 | pg++; |
| 464 | offset = 0; |
| 465 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 466 | } |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 467 | return total_copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 468 | } |
| 469 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 470 | /* |
| 471 | * unlocks pages after btrfs_file_write is done with them |
| 472 | */ |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 473 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 474 | { |
| 475 | size_t i; |
| 476 | for (i = 0; i < num_pages; i++) { |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 477 | /* page checked is some magic around finding pages that |
| 478 | * have been modified without going through btrfs_set_page_dirty |
| 479 | * clear it here |
| 480 | */ |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 481 | ClearPageChecked(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 482 | unlock_page(pages[i]); |
| 483 | mark_page_accessed(pages[i]); |
| 484 | page_cache_release(pages[i]); |
| 485 | } |
| 486 | } |
| 487 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 488 | /* |
| 489 | * after copy_from_user, pages need to be dirtied and we need to make |
| 490 | * sure holes are created between the current EOF and the start of |
| 491 | * any next extents (if required). |
| 492 | * |
| 493 | * this also makes the decision about creating an inline extent vs |
| 494 | * doing real data extents, marking pages dirty and delalloc as required. |
| 495 | */ |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 496 | int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 497 | struct page **pages, size_t num_pages, |
| 498 | loff_t pos, size_t write_bytes, |
| 499 | struct extent_state **cached) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 500 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 501 | int err = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 502 | int i; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 503 | u64 num_bytes; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 504 | u64 start_pos; |
| 505 | u64 end_of_last_block; |
| 506 | u64 end_pos = pos + write_bytes; |
| 507 | loff_t isize = i_size_read(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 508 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 509 | start_pos = pos & ~((u64)root->sectorsize - 1); |
Qu Wenruo | fda2832 | 2013-02-26 08:10:22 +0000 | [diff] [blame] | 510 | num_bytes = ALIGN(write_bytes + pos - start_pos, root->sectorsize); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 511 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 512 | end_of_last_block = start_pos + num_bytes - 1; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 513 | err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block, |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 514 | cached); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 515 | if (err) |
| 516 | return err; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 517 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 518 | for (i = 0; i < num_pages; i++) { |
| 519 | struct page *p = pages[i]; |
| 520 | SetPageUptodate(p); |
| 521 | ClearPageChecked(p); |
| 522 | set_page_dirty(p); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 523 | } |
Josef Bacik | 9f570b8 | 2011-01-25 12:42:37 -0500 | [diff] [blame] | 524 | |
| 525 | /* |
| 526 | * we've only changed i_size in ram, and we haven't updated |
| 527 | * the disk i_size. There is no need to log the inode |
| 528 | * at this time. |
| 529 | */ |
| 530 | if (end_pos > isize) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 531 | i_size_write(inode, end_pos); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 532 | return 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 533 | } |
| 534 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 535 | /* |
| 536 | * this drops all the extents in the cache that intersect the range |
| 537 | * [start, end]. Existing extents are split as required. |
| 538 | */ |
Josef Bacik | 7014cdb | 2012-08-30 20:06:49 -0400 | [diff] [blame] | 539 | void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, |
| 540 | int skip_pinned) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 541 | { |
| 542 | struct extent_map *em; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 543 | struct extent_map *split = NULL; |
| 544 | struct extent_map *split2 = NULL; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 545 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 546 | u64 len = end - start + 1; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 547 | u64 gen; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 548 | int ret; |
| 549 | int testend = 1; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 550 | unsigned long flags; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 551 | int compressed = 0; |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 552 | bool modified; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 553 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 554 | WARN_ON(end < start); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 555 | if (end == (u64)-1) { |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 556 | len = (u64)-1; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 557 | testend = 0; |
| 558 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 559 | while (1) { |
Josef Bacik | 7014cdb | 2012-08-30 20:06:49 -0400 | [diff] [blame] | 560 | int no_splits = 0; |
| 561 | |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 562 | modified = false; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 563 | if (!split) |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 564 | split = alloc_extent_map(); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 565 | if (!split2) |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 566 | split2 = alloc_extent_map(); |
Josef Bacik | 7014cdb | 2012-08-30 20:06:49 -0400 | [diff] [blame] | 567 | if (!split || !split2) |
| 568 | no_splits = 1; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 569 | |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 570 | write_lock(&em_tree->lock); |
Yan | 39b5637 | 2008-02-15 10:40:50 -0500 | [diff] [blame] | 571 | em = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 572 | if (!em) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 573 | write_unlock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 574 | break; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 575 | } |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 576 | flags = em->flags; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 577 | gen = em->generation; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 578 | if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) { |
Yan, Zheng | 55ef689 | 2009-11-12 09:36:44 +0000 | [diff] [blame] | 579 | if (testend && em->start + em->len >= start + len) { |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 580 | free_extent_map(em); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 581 | write_unlock(&em_tree->lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 582 | break; |
| 583 | } |
Yan, Zheng | 55ef689 | 2009-11-12 09:36:44 +0000 | [diff] [blame] | 584 | start = em->start + em->len; |
| 585 | if (testend) |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 586 | len = start + len - (em->start + em->len); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 587 | free_extent_map(em); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 588 | write_unlock(&em_tree->lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 589 | continue; |
| 590 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 591 | compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
Chris Mason | 3ce7e67 | 2008-07-31 15:42:54 -0400 | [diff] [blame] | 592 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
Liu Bo | 3b27759 | 2013-03-15 08:46:39 -0600 | [diff] [blame] | 593 | clear_bit(EXTENT_FLAG_LOGGING, &flags); |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 594 | modified = !list_empty(&em->list); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 595 | remove_extent_mapping(em_tree, em); |
Josef Bacik | 7014cdb | 2012-08-30 20:06:49 -0400 | [diff] [blame] | 596 | if (no_splits) |
| 597 | goto next; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 598 | |
Josef Bacik | ee20a98 | 2013-07-11 10:34:59 -0400 | [diff] [blame] | 599 | if (em->start < start) { |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 600 | split->start = em->start; |
| 601 | split->len = start - em->start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 602 | |
Josef Bacik | ee20a98 | 2013-07-11 10:34:59 -0400 | [diff] [blame] | 603 | if (em->block_start < EXTENT_MAP_LAST_BYTE) { |
| 604 | split->orig_start = em->orig_start; |
| 605 | split->block_start = em->block_start; |
| 606 | |
| 607 | if (compressed) |
| 608 | split->block_len = em->block_len; |
| 609 | else |
| 610 | split->block_len = split->len; |
| 611 | split->orig_block_len = max(split->block_len, |
| 612 | em->orig_block_len); |
| 613 | split->ram_bytes = em->ram_bytes; |
| 614 | } else { |
| 615 | split->orig_start = split->start; |
| 616 | split->block_len = 0; |
| 617 | split->block_start = em->block_start; |
| 618 | split->orig_block_len = 0; |
| 619 | split->ram_bytes = split->len; |
| 620 | } |
| 621 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 622 | split->generation = gen; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 623 | split->bdev = em->bdev; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 624 | split->flags = flags; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 625 | split->compress_type = em->compress_type; |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 626 | ret = add_extent_mapping(em_tree, split, modified); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 627 | BUG_ON(ret); /* Logic error */ |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 628 | free_extent_map(split); |
| 629 | split = split2; |
| 630 | split2 = NULL; |
| 631 | } |
Josef Bacik | ee20a98 | 2013-07-11 10:34:59 -0400 | [diff] [blame] | 632 | if (testend && em->start + em->len > start + len) { |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 633 | u64 diff = start + len - em->start; |
| 634 | |
| 635 | split->start = start + len; |
| 636 | split->len = em->start + em->len - (start + len); |
| 637 | split->bdev = em->bdev; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 638 | split->flags = flags; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 639 | split->compress_type = em->compress_type; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 640 | split->generation = gen; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 641 | |
Josef Bacik | ee20a98 | 2013-07-11 10:34:59 -0400 | [diff] [blame] | 642 | if (em->block_start < EXTENT_MAP_LAST_BYTE) { |
| 643 | split->orig_block_len = max(em->block_len, |
| 644 | em->orig_block_len); |
| 645 | |
| 646 | split->ram_bytes = em->ram_bytes; |
| 647 | if (compressed) { |
| 648 | split->block_len = em->block_len; |
| 649 | split->block_start = em->block_start; |
| 650 | split->orig_start = em->orig_start; |
| 651 | } else { |
| 652 | split->block_len = split->len; |
| 653 | split->block_start = em->block_start |
| 654 | + diff; |
| 655 | split->orig_start = em->orig_start; |
| 656 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 657 | } else { |
Josef Bacik | ee20a98 | 2013-07-11 10:34:59 -0400 | [diff] [blame] | 658 | split->ram_bytes = split->len; |
| 659 | split->orig_start = split->start; |
| 660 | split->block_len = 0; |
| 661 | split->block_start = em->block_start; |
| 662 | split->orig_block_len = 0; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 663 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 664 | |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 665 | ret = add_extent_mapping(em_tree, split, modified); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 666 | BUG_ON(ret); /* Logic error */ |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 667 | free_extent_map(split); |
| 668 | split = NULL; |
| 669 | } |
Josef Bacik | 7014cdb | 2012-08-30 20:06:49 -0400 | [diff] [blame] | 670 | next: |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 671 | write_unlock(&em_tree->lock); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 672 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 673 | /* once for us */ |
| 674 | free_extent_map(em); |
| 675 | /* once for the tree*/ |
| 676 | free_extent_map(em); |
| 677 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 678 | if (split) |
| 679 | free_extent_map(split); |
| 680 | if (split2) |
| 681 | free_extent_map(split2); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 682 | } |
| 683 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 684 | /* |
| 685 | * this is very complex, but the basic idea is to drop all extents |
| 686 | * in the range start - end. hint_block is filled in with a block number |
| 687 | * that would be a good hint to the block allocator for this file. |
| 688 | * |
| 689 | * If an extent intersects the range but is not entirely inside the range |
| 690 | * it is either truncated or split. Anything entirely inside the range |
| 691 | * is deleted from the tree. |
| 692 | */ |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 693 | int __btrfs_drop_extents(struct btrfs_trans_handle *trans, |
| 694 | struct btrfs_root *root, struct inode *inode, |
| 695 | struct btrfs_path *path, u64 start, u64 end, |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 696 | u64 *drop_end, int drop_cache) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 697 | { |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 698 | struct extent_buffer *leaf; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 699 | struct btrfs_file_extent_item *fi; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 700 | struct btrfs_key key; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 701 | struct btrfs_key new_key; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 702 | u64 ino = btrfs_ino(inode); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 703 | u64 search_start = start; |
| 704 | u64 disk_bytenr = 0; |
| 705 | u64 num_bytes = 0; |
| 706 | u64 extent_offset = 0; |
| 707 | u64 extent_end = 0; |
| 708 | int del_nr = 0; |
| 709 | int del_slot = 0; |
| 710 | int extent_type; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 711 | int recow; |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 712 | int ret; |
Chris Mason | dc7fdde | 2012-04-27 14:31:29 -0400 | [diff] [blame] | 713 | int modify_tree = -1; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 714 | int update_refs = (root->ref_cows || root == root->fs_info->tree_root); |
Josef Bacik | c3308f8 | 2012-09-14 14:51:22 -0400 | [diff] [blame] | 715 | int found = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 716 | |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 717 | if (drop_cache) |
| 718 | btrfs_drop_extent_cache(inode, start, end - 1, 0); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 719 | |
Chris Mason | dc7fdde | 2012-04-27 14:31:29 -0400 | [diff] [blame] | 720 | if (start >= BTRFS_I(inode)->disk_i_size) |
| 721 | modify_tree = 0; |
| 722 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 723 | while (1) { |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 724 | recow = 0; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 725 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
Chris Mason | dc7fdde | 2012-04-27 14:31:29 -0400 | [diff] [blame] | 726 | search_start, modify_tree); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 727 | if (ret < 0) |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 728 | break; |
| 729 | if (ret > 0 && path->slots[0] > 0 && search_start == start) { |
| 730 | leaf = path->nodes[0]; |
| 731 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 732 | if (key.objectid == ino && |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 733 | key.type == BTRFS_EXTENT_DATA_KEY) |
| 734 | path->slots[0]--; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 735 | } |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 736 | ret = 0; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 737 | next_slot: |
| 738 | leaf = path->nodes[0]; |
| 739 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 740 | BUG_ON(del_nr > 0); |
| 741 | ret = btrfs_next_leaf(root, path); |
| 742 | if (ret < 0) |
| 743 | break; |
| 744 | if (ret > 0) { |
| 745 | ret = 0; |
| 746 | break; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 747 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 748 | leaf = path->nodes[0]; |
| 749 | recow = 1; |
| 750 | } |
| 751 | |
| 752 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 753 | if (key.objectid > ino || |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 754 | key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end) |
| 755 | break; |
| 756 | |
| 757 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 758 | struct btrfs_file_extent_item); |
| 759 | extent_type = btrfs_file_extent_type(leaf, fi); |
| 760 | |
| 761 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
| 762 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
| 763 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 764 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
| 765 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
| 766 | extent_end = key.offset + |
| 767 | btrfs_file_extent_num_bytes(leaf, fi); |
| 768 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| 769 | extent_end = key.offset + |
| 770 | btrfs_file_extent_inline_len(leaf, fi); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 771 | } else { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 772 | WARN_ON(1); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 773 | extent_end = search_start; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 774 | } |
| 775 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 776 | if (extent_end <= search_start) { |
| 777 | path->slots[0]++; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 778 | goto next_slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 779 | } |
| 780 | |
Josef Bacik | c3308f8 | 2012-09-14 14:51:22 -0400 | [diff] [blame] | 781 | found = 1; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 782 | search_start = max(key.offset, start); |
Chris Mason | dc7fdde | 2012-04-27 14:31:29 -0400 | [diff] [blame] | 783 | if (recow || !modify_tree) { |
| 784 | modify_tree = -1; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 785 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 786 | continue; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 787 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 788 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 789 | /* |
| 790 | * | - range to drop - | |
| 791 | * | -------- extent -------- | |
| 792 | */ |
| 793 | if (start > key.offset && end < extent_end) { |
| 794 | BUG_ON(del_nr > 0); |
| 795 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); |
| 796 | |
| 797 | memcpy(&new_key, &key, sizeof(new_key)); |
| 798 | new_key.offset = start; |
| 799 | ret = btrfs_duplicate_item(trans, root, path, |
| 800 | &new_key); |
| 801 | if (ret == -EAGAIN) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 802 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 803 | continue; |
| 804 | } |
| 805 | if (ret < 0) |
| 806 | break; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 807 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 808 | leaf = path->nodes[0]; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 809 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
| 810 | struct btrfs_file_extent_item); |
| 811 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 812 | start - key.offset); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 813 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 814 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 815 | struct btrfs_file_extent_item); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 816 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 817 | extent_offset += start - key.offset; |
| 818 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); |
| 819 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 820 | extent_end - start); |
| 821 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 822 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 823 | if (update_refs && disk_bytenr > 0) { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 824 | ret = btrfs_inc_extent_ref(trans, root, |
| 825 | disk_bytenr, num_bytes, 0, |
| 826 | root->root_key.objectid, |
| 827 | new_key.objectid, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 828 | start - extent_offset, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 829 | BUG_ON(ret); /* -ENOMEM */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 830 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 831 | key.offset = start; |
| 832 | } |
| 833 | /* |
| 834 | * | ---- range to drop ----- | |
| 835 | * | -------- extent -------- | |
| 836 | */ |
| 837 | if (start <= key.offset && end < extent_end) { |
| 838 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); |
| 839 | |
| 840 | memcpy(&new_key, &key, sizeof(new_key)); |
| 841 | new_key.offset = end; |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 842 | btrfs_set_item_key_safe(root, path, &new_key); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 843 | |
| 844 | extent_offset += end - key.offset; |
| 845 | btrfs_set_file_extent_offset(leaf, fi, extent_offset); |
| 846 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 847 | extent_end - end); |
| 848 | btrfs_mark_buffer_dirty(leaf); |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 849 | if (update_refs && disk_bytenr > 0) |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 850 | inode_sub_bytes(inode, end - key.offset); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 851 | break; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 852 | } |
| 853 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 854 | search_start = extent_end; |
| 855 | /* |
| 856 | * | ---- range to drop ----- | |
| 857 | * | -------- extent -------- | |
| 858 | */ |
| 859 | if (start > key.offset && end >= extent_end) { |
| 860 | BUG_ON(del_nr > 0); |
| 861 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); |
| 862 | |
| 863 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 864 | start - key.offset); |
| 865 | btrfs_mark_buffer_dirty(leaf); |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 866 | if (update_refs && disk_bytenr > 0) |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 867 | inode_sub_bytes(inode, extent_end - start); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 868 | if (end == extent_end) |
| 869 | break; |
| 870 | |
| 871 | path->slots[0]++; |
| 872 | goto next_slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 873 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 874 | |
| 875 | /* |
| 876 | * | ---- range to drop ----- | |
| 877 | * | ------ extent ------ | |
| 878 | */ |
| 879 | if (start <= key.offset && end >= extent_end) { |
| 880 | if (del_nr == 0) { |
| 881 | del_slot = path->slots[0]; |
| 882 | del_nr = 1; |
| 883 | } else { |
| 884 | BUG_ON(del_slot + del_nr != path->slots[0]); |
| 885 | del_nr++; |
| 886 | } |
| 887 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 888 | if (update_refs && |
| 889 | extent_type == BTRFS_FILE_EXTENT_INLINE) { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 890 | inode_sub_bytes(inode, |
| 891 | extent_end - key.offset); |
| 892 | extent_end = ALIGN(extent_end, |
| 893 | root->sectorsize); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 894 | } else if (update_refs && disk_bytenr > 0) { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 895 | ret = btrfs_free_extent(trans, root, |
| 896 | disk_bytenr, num_bytes, 0, |
| 897 | root->root_key.objectid, |
| 898 | key.objectid, key.offset - |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 899 | extent_offset, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 900 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 901 | inode_sub_bytes(inode, |
| 902 | extent_end - key.offset); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 903 | } |
| 904 | |
| 905 | if (end == extent_end) |
| 906 | break; |
| 907 | |
| 908 | if (path->slots[0] + 1 < btrfs_header_nritems(leaf)) { |
| 909 | path->slots[0]++; |
| 910 | goto next_slot; |
| 911 | } |
| 912 | |
| 913 | ret = btrfs_del_items(trans, root, path, del_slot, |
| 914 | del_nr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 915 | if (ret) { |
| 916 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 917 | break; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 918 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 919 | |
| 920 | del_nr = 0; |
| 921 | del_slot = 0; |
| 922 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 923 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 924 | continue; |
| 925 | } |
| 926 | |
| 927 | BUG_ON(1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 928 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 929 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 930 | if (!ret && del_nr > 0) { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 931 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 932 | if (ret) |
| 933 | btrfs_abort_transaction(trans, root, ret); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 934 | } |
| 935 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 936 | if (drop_end) |
Josef Bacik | c3308f8 | 2012-09-14 14:51:22 -0400 | [diff] [blame] | 937 | *drop_end = found ? min(end, extent_end) : end; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 938 | btrfs_release_path(path); |
| 939 | return ret; |
| 940 | } |
| 941 | |
| 942 | int btrfs_drop_extents(struct btrfs_trans_handle *trans, |
| 943 | struct btrfs_root *root, struct inode *inode, u64 start, |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 944 | u64 end, int drop_cache) |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 945 | { |
| 946 | struct btrfs_path *path; |
| 947 | int ret; |
| 948 | |
| 949 | path = btrfs_alloc_path(); |
| 950 | if (!path) |
| 951 | return -ENOMEM; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 952 | ret = __btrfs_drop_extents(trans, root, inode, path, start, end, NULL, |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 953 | drop_cache); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 954 | btrfs_free_path(path); |
| 955 | return ret; |
| 956 | } |
| 957 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 958 | static int extent_mergeable(struct extent_buffer *leaf, int slot, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 959 | u64 objectid, u64 bytenr, u64 orig_offset, |
| 960 | u64 *start, u64 *end) |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 961 | { |
| 962 | struct btrfs_file_extent_item *fi; |
| 963 | struct btrfs_key key; |
| 964 | u64 extent_end; |
| 965 | |
| 966 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) |
| 967 | return 0; |
| 968 | |
| 969 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 970 | if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY) |
| 971 | return 0; |
| 972 | |
| 973 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 974 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG || |
| 975 | btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr || |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 976 | btrfs_file_extent_offset(leaf, fi) != key.offset - orig_offset || |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 977 | btrfs_file_extent_compression(leaf, fi) || |
| 978 | btrfs_file_extent_encryption(leaf, fi) || |
| 979 | btrfs_file_extent_other_encoding(leaf, fi)) |
| 980 | return 0; |
| 981 | |
| 982 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 983 | if ((*start && *start != key.offset) || (*end && *end != extent_end)) |
| 984 | return 0; |
| 985 | |
| 986 | *start = key.offset; |
| 987 | *end = extent_end; |
| 988 | return 1; |
| 989 | } |
| 990 | |
| 991 | /* |
| 992 | * Mark extent in the range start - end as written. |
| 993 | * |
| 994 | * This changes extent type from 'pre-allocated' to 'regular'. If only |
| 995 | * part of extent is marked as written, the extent will be split into |
| 996 | * two or three. |
| 997 | */ |
| 998 | int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 999 | struct inode *inode, u64 start, u64 end) |
| 1000 | { |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1001 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1002 | struct extent_buffer *leaf; |
| 1003 | struct btrfs_path *path; |
| 1004 | struct btrfs_file_extent_item *fi; |
| 1005 | struct btrfs_key key; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1006 | struct btrfs_key new_key; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1007 | u64 bytenr; |
| 1008 | u64 num_bytes; |
| 1009 | u64 extent_end; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1010 | u64 orig_offset; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1011 | u64 other_start; |
| 1012 | u64 other_end; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1013 | u64 split; |
| 1014 | int del_nr = 0; |
| 1015 | int del_slot = 0; |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1016 | int recow; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1017 | int ret; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1018 | u64 ino = btrfs_ino(inode); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1019 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1020 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 1021 | if (!path) |
| 1022 | return -ENOMEM; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1023 | again: |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1024 | recow = 0; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1025 | split = start; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1026 | key.objectid = ino; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1027 | key.type = BTRFS_EXTENT_DATA_KEY; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1028 | key.offset = split; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1029 | |
| 1030 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Josef Bacik | 4141573 | 2011-03-16 13:59:32 -0400 | [diff] [blame] | 1031 | if (ret < 0) |
| 1032 | goto out; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1033 | if (ret > 0 && path->slots[0] > 0) |
| 1034 | path->slots[0]--; |
| 1035 | |
| 1036 | leaf = path->nodes[0]; |
| 1037 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1038 | BUG_ON(key.objectid != ino || key.type != BTRFS_EXTENT_DATA_KEY); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1039 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1040 | struct btrfs_file_extent_item); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1041 | BUG_ON(btrfs_file_extent_type(leaf, fi) != |
| 1042 | BTRFS_FILE_EXTENT_PREALLOC); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1043 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 1044 | BUG_ON(key.offset > start || extent_end < end); |
| 1045 | |
| 1046 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 1047 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1048 | orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1049 | memcpy(&new_key, &key, sizeof(new_key)); |
| 1050 | |
| 1051 | if (start == key.offset && end < extent_end) { |
| 1052 | other_start = 0; |
| 1053 | other_end = start; |
| 1054 | if (extent_mergeable(leaf, path->slots[0] - 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1055 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1056 | &other_start, &other_end)) { |
| 1057 | new_key.offset = end; |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1058 | btrfs_set_item_key_safe(root, path, &new_key); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1059 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1060 | struct btrfs_file_extent_item); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1061 | btrfs_set_file_extent_generation(leaf, fi, |
| 1062 | trans->transid); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1063 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1064 | extent_end - end); |
| 1065 | btrfs_set_file_extent_offset(leaf, fi, |
| 1066 | end - orig_offset); |
| 1067 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
| 1068 | struct btrfs_file_extent_item); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1069 | btrfs_set_file_extent_generation(leaf, fi, |
| 1070 | trans->transid); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1071 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1072 | end - other_start); |
| 1073 | btrfs_mark_buffer_dirty(leaf); |
| 1074 | goto out; |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | if (start > key.offset && end == extent_end) { |
| 1079 | other_start = end; |
| 1080 | other_end = 0; |
| 1081 | if (extent_mergeable(leaf, path->slots[0] + 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1082 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1083 | &other_start, &other_end)) { |
| 1084 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1085 | struct btrfs_file_extent_item); |
| 1086 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1087 | start - key.offset); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1088 | btrfs_set_file_extent_generation(leaf, fi, |
| 1089 | trans->transid); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1090 | path->slots[0]++; |
| 1091 | new_key.offset = start; |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1092 | btrfs_set_item_key_safe(root, path, &new_key); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1093 | |
| 1094 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1095 | struct btrfs_file_extent_item); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1096 | btrfs_set_file_extent_generation(leaf, fi, |
| 1097 | trans->transid); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1098 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1099 | other_end - start); |
| 1100 | btrfs_set_file_extent_offset(leaf, fi, |
| 1101 | start - orig_offset); |
| 1102 | btrfs_mark_buffer_dirty(leaf); |
| 1103 | goto out; |
| 1104 | } |
| 1105 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1106 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1107 | while (start > key.offset || end < extent_end) { |
| 1108 | if (key.offset == start) |
| 1109 | split = end; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1110 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1111 | new_key.offset = split; |
| 1112 | ret = btrfs_duplicate_item(trans, root, path, &new_key); |
| 1113 | if (ret == -EAGAIN) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1114 | btrfs_release_path(path); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1115 | goto again; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1116 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1117 | if (ret < 0) { |
| 1118 | btrfs_abort_transaction(trans, root, ret); |
| 1119 | goto out; |
| 1120 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1121 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1122 | leaf = path->nodes[0]; |
| 1123 | fi = btrfs_item_ptr(leaf, path->slots[0] - 1, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1124 | struct btrfs_file_extent_item); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1125 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1126 | btrfs_set_file_extent_num_bytes(leaf, fi, |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1127 | split - key.offset); |
| 1128 | |
| 1129 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1130 | struct btrfs_file_extent_item); |
| 1131 | |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1132 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1133 | btrfs_set_file_extent_offset(leaf, fi, split - orig_offset); |
| 1134 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1135 | extent_end - split); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1136 | btrfs_mark_buffer_dirty(leaf); |
| 1137 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1138 | ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, |
| 1139 | root->root_key.objectid, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1140 | ino, orig_offset, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1141 | BUG_ON(ret); /* -ENOMEM */ |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1142 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1143 | if (split == start) { |
| 1144 | key.offset = start; |
| 1145 | } else { |
| 1146 | BUG_ON(start != key.offset); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1147 | path->slots[0]--; |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1148 | extent_end = end; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1149 | } |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1150 | recow = 1; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1151 | } |
| 1152 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1153 | other_start = end; |
| 1154 | other_end = 0; |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1155 | if (extent_mergeable(leaf, path->slots[0] + 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1156 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1157 | &other_start, &other_end)) { |
| 1158 | if (recow) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1159 | btrfs_release_path(path); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1160 | goto again; |
| 1161 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1162 | extent_end = other_end; |
| 1163 | del_slot = path->slots[0] + 1; |
| 1164 | del_nr++; |
| 1165 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
| 1166 | 0, root->root_key.objectid, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1167 | ino, orig_offset, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1168 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1169 | } |
| 1170 | other_start = 0; |
| 1171 | other_end = start; |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1172 | if (extent_mergeable(leaf, path->slots[0] - 1, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1173 | ino, bytenr, orig_offset, |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1174 | &other_start, &other_end)) { |
| 1175 | if (recow) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1176 | btrfs_release_path(path); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1177 | goto again; |
| 1178 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1179 | key.offset = other_start; |
| 1180 | del_slot = path->slots[0]; |
| 1181 | del_nr++; |
| 1182 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
| 1183 | 0, root->root_key.objectid, |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 1184 | ino, orig_offset, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1185 | BUG_ON(ret); /* -ENOMEM */ |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1186 | } |
| 1187 | if (del_nr == 0) { |
Shaohua Li | 3f6fae9 | 2010-02-11 07:43:00 +0000 | [diff] [blame] | 1188 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1189 | struct btrfs_file_extent_item); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1190 | btrfs_set_file_extent_type(leaf, fi, |
| 1191 | BTRFS_FILE_EXTENT_REG); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1192 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1193 | btrfs_mark_buffer_dirty(leaf); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1194 | } else { |
Shaohua Li | 3f6fae9 | 2010-02-11 07:43:00 +0000 | [diff] [blame] | 1195 | fi = btrfs_item_ptr(leaf, del_slot - 1, |
| 1196 | struct btrfs_file_extent_item); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1197 | btrfs_set_file_extent_type(leaf, fi, |
| 1198 | BTRFS_FILE_EXTENT_REG); |
Josef Bacik | 224ecce | 2012-08-16 16:32:06 -0400 | [diff] [blame] | 1199 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
Yan, Zheng | 6c7d54a | 2010-01-15 08:43:09 +0000 | [diff] [blame] | 1200 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 1201 | extent_end - key.offset); |
| 1202 | btrfs_mark_buffer_dirty(leaf); |
| 1203 | |
| 1204 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1205 | if (ret < 0) { |
| 1206 | btrfs_abort_transaction(trans, root, ret); |
| 1207 | goto out; |
| 1208 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1209 | } |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1210 | out: |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1211 | btrfs_free_path(path); |
| 1212 | return 0; |
| 1213 | } |
| 1214 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1215 | /* |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1216 | * on error we return an unlocked page and the error value |
| 1217 | * on success we return a locked page and 0 |
| 1218 | */ |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1219 | static int prepare_uptodate_page(struct page *page, u64 pos, |
| 1220 | bool force_uptodate) |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1221 | { |
| 1222 | int ret = 0; |
| 1223 | |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1224 | if (((pos & (PAGE_CACHE_SIZE - 1)) || force_uptodate) && |
| 1225 | !PageUptodate(page)) { |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1226 | ret = btrfs_readpage(NULL, page); |
| 1227 | if (ret) |
| 1228 | return ret; |
| 1229 | lock_page(page); |
| 1230 | if (!PageUptodate(page)) { |
| 1231 | unlock_page(page); |
| 1232 | return -EIO; |
| 1233 | } |
| 1234 | } |
| 1235 | return 0; |
| 1236 | } |
| 1237 | |
| 1238 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1239 | * this gets pages into the page cache and locks them down, it also properly |
| 1240 | * waits for data=ordered extents to finish before allowing the pages to be |
| 1241 | * modified. |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1242 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1243 | static noinline int prepare_pages(struct btrfs_root *root, struct file *file, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 1244 | struct page **pages, size_t num_pages, |
| 1245 | loff_t pos, unsigned long first_index, |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1246 | size_t write_bytes, bool force_uptodate) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1247 | { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1248 | struct extent_state *cached_state = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1249 | int i; |
| 1250 | unsigned long index = pos >> PAGE_CACHE_SHIFT; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1251 | struct inode *inode = file_inode(file); |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 1252 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1253 | int err = 0; |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1254 | int faili = 0; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1255 | u64 start_pos; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1256 | u64 last_pos; |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1257 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1258 | start_pos = pos & ~((u64)root->sectorsize - 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1259 | last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1260 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1261 | again: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1262 | for (i = 0; i < num_pages; i++) { |
Josef Bacik | a94733d | 2011-07-11 10:47:06 -0400 | [diff] [blame] | 1263 | pages[i] = find_or_create_page(inode->i_mapping, index + i, |
Johannes Weiner | e3a41a5 | 2012-01-10 15:07:55 -0800 | [diff] [blame] | 1264 | mask | __GFP_WRITE); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1265 | if (!pages[i]) { |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1266 | faili = i - 1; |
| 1267 | err = -ENOMEM; |
| 1268 | goto fail; |
| 1269 | } |
| 1270 | |
| 1271 | if (i == 0) |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1272 | err = prepare_uptodate_page(pages[i], pos, |
| 1273 | force_uptodate); |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1274 | if (i == num_pages - 1) |
| 1275 | err = prepare_uptodate_page(pages[i], |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1276 | pos + write_bytes, false); |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1277 | if (err) { |
| 1278 | page_cache_release(pages[i]); |
| 1279 | faili = i - 1; |
| 1280 | goto fail; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1281 | } |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1282 | wait_on_page_writeback(pages[i]); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1283 | } |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1284 | err = 0; |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 1285 | if (start_pos < inode->i_size) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1286 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1287 | lock_extent_bits(&BTRFS_I(inode)->io_tree, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 1288 | start_pos, last_pos - 1, 0, &cached_state); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1289 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 1290 | last_pos - 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1291 | if (ordered && |
| 1292 | ordered->file_offset + ordered->len > start_pos && |
| 1293 | ordered->file_offset < last_pos) { |
| 1294 | btrfs_put_ordered_extent(ordered); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1295 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
| 1296 | start_pos, last_pos - 1, |
| 1297 | &cached_state, GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1298 | for (i = 0; i < num_pages; i++) { |
| 1299 | unlock_page(pages[i]); |
| 1300 | page_cache_release(pages[i]); |
| 1301 | } |
| 1302 | btrfs_wait_ordered_range(inode, start_pos, |
| 1303 | last_pos - start_pos); |
| 1304 | goto again; |
| 1305 | } |
| 1306 | if (ordered) |
| 1307 | btrfs_put_ordered_extent(ordered); |
| 1308 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1309 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start_pos, |
Josef Bacik | 32c00af | 2009-10-08 13:34:05 -0400 | [diff] [blame] | 1310 | last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC | |
Liu Bo | 9e8a4a8 | 2012-09-05 19:10:51 -0600 | [diff] [blame] | 1311 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, |
| 1312 | 0, 0, &cached_state, GFP_NOFS); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1313 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
| 1314 | start_pos, last_pos - 1, &cached_state, |
| 1315 | GFP_NOFS); |
Chris Mason | 0762704 | 2008-02-19 11:29:24 -0500 | [diff] [blame] | 1316 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1317 | for (i = 0; i < num_pages; i++) { |
Wu Fengguang | 32c7f20 | 2011-08-08 15:19:47 -0600 | [diff] [blame] | 1318 | if (clear_page_dirty_for_io(pages[i])) |
| 1319 | account_page_redirty(pages[i]); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1320 | set_page_extent_mapped(pages[i]); |
| 1321 | WARN_ON(!PageLocked(pages[i])); |
| 1322 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1323 | return 0; |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1324 | fail: |
| 1325 | while (faili >= 0) { |
| 1326 | unlock_page(pages[faili]); |
| 1327 | page_cache_release(pages[faili]); |
| 1328 | faili--; |
| 1329 | } |
| 1330 | return err; |
| 1331 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1332 | } |
| 1333 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1334 | static noinline int check_can_nocow(struct inode *inode, loff_t pos, |
| 1335 | size_t *write_bytes) |
| 1336 | { |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1337 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1338 | struct btrfs_ordered_extent *ordered; |
| 1339 | u64 lockstart, lockend; |
| 1340 | u64 num_bytes; |
| 1341 | int ret; |
| 1342 | |
| 1343 | lockstart = round_down(pos, root->sectorsize); |
| 1344 | lockend = lockstart + round_up(*write_bytes, root->sectorsize) - 1; |
| 1345 | |
| 1346 | while (1) { |
| 1347 | lock_extent(&BTRFS_I(inode)->io_tree, lockstart, lockend); |
| 1348 | ordered = btrfs_lookup_ordered_range(inode, lockstart, |
| 1349 | lockend - lockstart + 1); |
| 1350 | if (!ordered) { |
| 1351 | break; |
| 1352 | } |
| 1353 | unlock_extent(&BTRFS_I(inode)->io_tree, lockstart, lockend); |
| 1354 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 1355 | btrfs_put_ordered_extent(ordered); |
| 1356 | } |
| 1357 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1358 | num_bytes = lockend - lockstart + 1; |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 1359 | ret = can_nocow_extent(inode, lockstart, &num_bytes, NULL, NULL, NULL); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1360 | if (ret <= 0) { |
| 1361 | ret = 0; |
| 1362 | } else { |
| 1363 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 1364 | EXTENT_DIRTY | EXTENT_DELALLOC | |
| 1365 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
| 1366 | NULL, GFP_NOFS); |
| 1367 | *write_bytes = min_t(size_t, *write_bytes, num_bytes); |
| 1368 | } |
| 1369 | |
| 1370 | unlock_extent(&BTRFS_I(inode)->io_tree, lockstart, lockend); |
| 1371 | |
| 1372 | return ret; |
| 1373 | } |
| 1374 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1375 | static noinline ssize_t __btrfs_buffered_write(struct file *file, |
| 1376 | struct iov_iter *i, |
| 1377 | loff_t pos) |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 1378 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1379 | struct inode *inode = file_inode(file); |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1380 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1381 | struct page **pages = NULL; |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1382 | u64 release_bytes = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1383 | unsigned long first_index; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1384 | size_t num_written = 0; |
| 1385 | int nrptrs; |
Tsutomu Itoh | c914923 | 2011-03-30 00:57:23 +0000 | [diff] [blame] | 1386 | int ret = 0; |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1387 | bool only_release_metadata = false; |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1388 | bool force_page_uptodate = false; |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 1389 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1390 | nrptrs = min((iov_iter_count(i) + PAGE_CACHE_SIZE - 1) / |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1391 | PAGE_CACHE_SIZE, PAGE_CACHE_SIZE / |
| 1392 | (sizeof(struct page *))); |
Wu Fengguang | 142349f | 2011-12-16 12:32:57 -0500 | [diff] [blame] | 1393 | nrptrs = min(nrptrs, current->nr_dirtied_pause - current->nr_dirtied); |
| 1394 | nrptrs = max(nrptrs, 8); |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1395 | pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1396 | if (!pages) |
| 1397 | return -ENOMEM; |
Chris Mason | ab93dbe | 2009-10-01 12:29:10 -0400 | [diff] [blame] | 1398 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1399 | first_index = pos >> PAGE_CACHE_SHIFT; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1400 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1401 | while (iov_iter_count(i) > 0) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1402 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1403 | size_t write_bytes = min(iov_iter_count(i), |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 1404 | nrptrs * (size_t)PAGE_CACHE_SIZE - |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1405 | offset); |
Yan, Zheng | 3a90983 | 2011-01-18 13:34:40 +0800 | [diff] [blame] | 1406 | size_t num_pages = (write_bytes + offset + |
| 1407 | PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1408 | size_t reserve_bytes; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1409 | size_t dirty_pages; |
| 1410 | size_t copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1411 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1412 | WARN_ON(num_pages > nrptrs); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1413 | |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1414 | /* |
| 1415 | * Fault pages before locking them in prepare_pages |
| 1416 | * to avoid recursive lock |
| 1417 | */ |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1418 | if (unlikely(iov_iter_fault_in_readable(i, write_bytes))) { |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1419 | ret = -EFAULT; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1420 | break; |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1421 | } |
| 1422 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1423 | reserve_bytes = num_pages << PAGE_CACHE_SHIFT; |
| 1424 | ret = btrfs_check_data_free_space(inode, reserve_bytes); |
| 1425 | if (ret == -ENOSPC && |
| 1426 | (BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW | |
| 1427 | BTRFS_INODE_PREALLOC))) { |
| 1428 | ret = check_can_nocow(inode, pos, &write_bytes); |
| 1429 | if (ret > 0) { |
| 1430 | only_release_metadata = true; |
| 1431 | /* |
| 1432 | * our prealloc extent may be smaller than |
| 1433 | * write_bytes, so scale down. |
| 1434 | */ |
| 1435 | num_pages = (write_bytes + offset + |
| 1436 | PAGE_CACHE_SIZE - 1) >> |
| 1437 | PAGE_CACHE_SHIFT; |
| 1438 | reserve_bytes = num_pages << PAGE_CACHE_SHIFT; |
| 1439 | ret = 0; |
| 1440 | } else { |
| 1441 | ret = -ENOSPC; |
| 1442 | } |
| 1443 | } |
| 1444 | |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1445 | if (ret) |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1446 | break; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1447 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1448 | ret = btrfs_delalloc_reserve_metadata(inode, reserve_bytes); |
| 1449 | if (ret) { |
| 1450 | if (!only_release_metadata) |
| 1451 | btrfs_free_reserved_data_space(inode, |
| 1452 | reserve_bytes); |
| 1453 | break; |
| 1454 | } |
| 1455 | |
| 1456 | release_bytes = reserve_bytes; |
| 1457 | |
Josef Bacik | 4a64001 | 2011-01-25 15:10:08 -0500 | [diff] [blame] | 1458 | /* |
| 1459 | * This is going to setup the pages array with the number of |
| 1460 | * pages we want, so we don't really need to worry about the |
| 1461 | * contents of pages from loop to loop |
| 1462 | */ |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1463 | ret = prepare_pages(root, file, pages, num_pages, |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1464 | pos, first_index, write_bytes, |
| 1465 | force_page_uptodate); |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1466 | if (ret) |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1467 | break; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1468 | |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1469 | copied = btrfs_copy_from_user(pos, num_pages, |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1470 | write_bytes, pages, i); |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1471 | |
| 1472 | /* |
| 1473 | * if we have trouble faulting in the pages, fall |
| 1474 | * back to one page at a time |
| 1475 | */ |
| 1476 | if (copied < write_bytes) |
| 1477 | nrptrs = 1; |
| 1478 | |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1479 | if (copied == 0) { |
| 1480 | force_page_uptodate = true; |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1481 | dirty_pages = 0; |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1482 | } else { |
| 1483 | force_page_uptodate = false; |
Chris Mason | b1bf862 | 2011-02-28 09:52:08 -0500 | [diff] [blame] | 1484 | dirty_pages = (copied + offset + |
| 1485 | PAGE_CACHE_SIZE - 1) >> |
| 1486 | PAGE_CACHE_SHIFT; |
Josef Bacik | b6316429 | 2011-09-30 15:23:54 -0400 | [diff] [blame] | 1487 | } |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1488 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1489 | /* |
| 1490 | * If we had a short copy we need to release the excess delaloc |
| 1491 | * bytes we reserved. We need to increment outstanding_extents |
| 1492 | * because btrfs_delalloc_release_space will decrement it, but |
| 1493 | * we still have an outstanding extent for the chunk we actually |
| 1494 | * managed to copy. |
| 1495 | */ |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1496 | if (num_pages > dirty_pages) { |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1497 | release_bytes = (num_pages - dirty_pages) << |
| 1498 | PAGE_CACHE_SHIFT; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1499 | if (copied > 0) { |
| 1500 | spin_lock(&BTRFS_I(inode)->lock); |
| 1501 | BTRFS_I(inode)->outstanding_extents++; |
| 1502 | spin_unlock(&BTRFS_I(inode)->lock); |
| 1503 | } |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1504 | if (only_release_metadata) |
| 1505 | btrfs_delalloc_release_metadata(inode, |
| 1506 | release_bytes); |
| 1507 | else |
| 1508 | btrfs_delalloc_release_space(inode, |
| 1509 | release_bytes); |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1510 | } |
| 1511 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1512 | release_bytes = dirty_pages << PAGE_CACHE_SHIFT; |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1513 | if (copied > 0) { |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1514 | ret = btrfs_dirty_pages(root, inode, pages, |
| 1515 | dirty_pages, pos, copied, |
| 1516 | NULL); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1517 | if (ret) { |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1518 | btrfs_drop_pages(pages, num_pages); |
| 1519 | break; |
| 1520 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1521 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1522 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1523 | release_bytes = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1524 | btrfs_drop_pages(pages, num_pages); |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1525 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1526 | if (only_release_metadata && copied > 0) { |
| 1527 | u64 lockstart = round_down(pos, root->sectorsize); |
| 1528 | u64 lockend = lockstart + |
| 1529 | (dirty_pages << PAGE_CACHE_SHIFT) - 1; |
| 1530 | |
| 1531 | set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, |
| 1532 | lockend, EXTENT_NORESERVE, NULL, |
| 1533 | NULL, GFP_NOFS); |
| 1534 | only_release_metadata = false; |
| 1535 | } |
| 1536 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1537 | cond_resched(); |
| 1538 | |
Namjae Jeon | d0e1d66 | 2012-12-11 16:00:21 -0800 | [diff] [blame] | 1539 | balance_dirty_pages_ratelimited(inode->i_mapping); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1540 | if (dirty_pages < (root->leafsize >> PAGE_CACHE_SHIFT) + 1) |
Liu Bo | b53d3f5 | 2012-11-14 14:34:34 +0000 | [diff] [blame] | 1541 | btrfs_btree_balance_dirty(root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1542 | |
Xin Zhong | 914ee29 | 2010-12-09 09:30:14 +0000 | [diff] [blame] | 1543 | pos += copied; |
| 1544 | num_written += copied; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1545 | } |
Chris Mason | 5b92ee7 | 2008-01-03 13:46:11 -0500 | [diff] [blame] | 1546 | |
Chris Mason | 8c2383c | 2007-06-18 09:57:58 -0400 | [diff] [blame] | 1547 | kfree(pages); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1548 | |
Josef Bacik | 7ee9e44 | 2013-06-21 16:37:03 -0400 | [diff] [blame] | 1549 | if (release_bytes) { |
| 1550 | if (only_release_metadata) |
| 1551 | btrfs_delalloc_release_metadata(inode, release_bytes); |
| 1552 | else |
| 1553 | btrfs_delalloc_release_space(inode, release_bytes); |
| 1554 | } |
| 1555 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1556 | return num_written ? num_written : ret; |
| 1557 | } |
| 1558 | |
| 1559 | static ssize_t __btrfs_direct_write(struct kiocb *iocb, |
| 1560 | const struct iovec *iov, |
| 1561 | unsigned long nr_segs, loff_t pos, |
| 1562 | loff_t *ppos, size_t count, size_t ocount) |
| 1563 | { |
| 1564 | struct file *file = iocb->ki_filp; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1565 | struct iov_iter i; |
| 1566 | ssize_t written; |
| 1567 | ssize_t written_buffered; |
| 1568 | loff_t endbyte; |
| 1569 | int err; |
| 1570 | |
| 1571 | written = generic_file_direct_write(iocb, iov, &nr_segs, pos, ppos, |
| 1572 | count, ocount); |
| 1573 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1574 | if (written < 0 || written == count) |
| 1575 | return written; |
| 1576 | |
| 1577 | pos += written; |
| 1578 | count -= written; |
| 1579 | iov_iter_init(&i, iov, nr_segs, count, written); |
| 1580 | written_buffered = __btrfs_buffered_write(file, &i, pos); |
| 1581 | if (written_buffered < 0) { |
| 1582 | err = written_buffered; |
| 1583 | goto out; |
| 1584 | } |
| 1585 | endbyte = pos + written_buffered - 1; |
| 1586 | err = filemap_write_and_wait_range(file->f_mapping, pos, endbyte); |
| 1587 | if (err) |
| 1588 | goto out; |
| 1589 | written += written_buffered; |
| 1590 | *ppos = pos + written_buffered; |
| 1591 | invalidate_mapping_pages(file->f_mapping, pos >> PAGE_CACHE_SHIFT, |
| 1592 | endbyte >> PAGE_CACHE_SHIFT); |
| 1593 | out: |
| 1594 | return written ? written : err; |
| 1595 | } |
| 1596 | |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1597 | static void update_time_for_write(struct inode *inode) |
| 1598 | { |
| 1599 | struct timespec now; |
| 1600 | |
| 1601 | if (IS_NOCMTIME(inode)) |
| 1602 | return; |
| 1603 | |
| 1604 | now = current_fs_time(inode->i_sb); |
| 1605 | if (!timespec_equal(&inode->i_mtime, &now)) |
| 1606 | inode->i_mtime = now; |
| 1607 | |
| 1608 | if (!timespec_equal(&inode->i_ctime, &now)) |
| 1609 | inode->i_ctime = now; |
| 1610 | |
| 1611 | if (IS_I_VERSION(inode)) |
| 1612 | inode_inc_iversion(inode); |
| 1613 | } |
| 1614 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1615 | static ssize_t btrfs_file_aio_write(struct kiocb *iocb, |
| 1616 | const struct iovec *iov, |
| 1617 | unsigned long nr_segs, loff_t pos) |
| 1618 | { |
| 1619 | struct file *file = iocb->ki_filp; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1620 | struct inode *inode = file_inode(file); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1621 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1622 | loff_t *ppos = &iocb->ki_pos; |
Miao Xie | 0c1a98c | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1623 | u64 start_pos; |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1624 | ssize_t num_written = 0; |
| 1625 | ssize_t err = 0; |
| 1626 | size_t count, ocount; |
Josef Bacik | b812ce2 | 2012-11-16 13:56:32 -0500 | [diff] [blame] | 1627 | bool sync = (file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1628 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1629 | mutex_lock(&inode->i_mutex); |
| 1630 | |
| 1631 | err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ); |
| 1632 | if (err) { |
| 1633 | mutex_unlock(&inode->i_mutex); |
| 1634 | goto out; |
| 1635 | } |
| 1636 | count = ocount; |
| 1637 | |
| 1638 | current->backing_dev_info = inode->i_mapping->backing_dev_info; |
| 1639 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); |
| 1640 | if (err) { |
| 1641 | mutex_unlock(&inode->i_mutex); |
| 1642 | goto out; |
| 1643 | } |
| 1644 | |
| 1645 | if (count == 0) { |
| 1646 | mutex_unlock(&inode->i_mutex); |
| 1647 | goto out; |
| 1648 | } |
| 1649 | |
| 1650 | err = file_remove_suid(file); |
| 1651 | if (err) { |
| 1652 | mutex_unlock(&inode->i_mutex); |
| 1653 | goto out; |
| 1654 | } |
| 1655 | |
| 1656 | /* |
| 1657 | * If BTRFS flips readonly due to some impossible error |
| 1658 | * (fs_info->fs_state now has BTRFS_SUPER_FLAG_ERROR), |
| 1659 | * although we have opened a file as writable, we have |
| 1660 | * to stop this write operation to ensure FS consistency. |
| 1661 | */ |
Miao Xie | 87533c4 | 2013-01-29 10:14:48 +0000 | [diff] [blame] | 1662 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1663 | mutex_unlock(&inode->i_mutex); |
| 1664 | err = -EROFS; |
| 1665 | goto out; |
| 1666 | } |
| 1667 | |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1668 | /* |
| 1669 | * We reserve space for updating the inode when we reserve space for the |
| 1670 | * extent we are going to write, so we will enospc out there. We don't |
| 1671 | * need to start yet another transaction to update the inode as we will |
| 1672 | * update the inode when we finish writing whatever data we write. |
| 1673 | */ |
| 1674 | update_time_for_write(inode); |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1675 | |
Miao Xie | 0c1a98c | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 1676 | start_pos = round_down(pos, root->sectorsize); |
| 1677 | if (start_pos > i_size_read(inode)) { |
| 1678 | err = btrfs_cont_expand(inode, i_size_read(inode), start_pos); |
| 1679 | if (err) { |
| 1680 | mutex_unlock(&inode->i_mutex); |
| 1681 | goto out; |
| 1682 | } |
| 1683 | } |
| 1684 | |
Josef Bacik | b812ce2 | 2012-11-16 13:56:32 -0500 | [diff] [blame] | 1685 | if (sync) |
| 1686 | atomic_inc(&BTRFS_I(inode)->sync_writers); |
| 1687 | |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1688 | if (unlikely(file->f_flags & O_DIRECT)) { |
| 1689 | num_written = __btrfs_direct_write(iocb, iov, nr_segs, |
| 1690 | pos, ppos, count, ocount); |
| 1691 | } else { |
| 1692 | struct iov_iter i; |
| 1693 | |
| 1694 | iov_iter_init(&i, iov, nr_segs, count, num_written); |
| 1695 | |
| 1696 | num_written = __btrfs_buffered_write(file, &i, pos); |
| 1697 | if (num_written > 0) |
| 1698 | *ppos = pos + num_written; |
| 1699 | } |
| 1700 | |
| 1701 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 1702 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1703 | /* |
| 1704 | * we want to make sure fsync finds this change |
| 1705 | * but we haven't joined a transaction running right now. |
| 1706 | * |
| 1707 | * Later on, someone is sure to update the inode and get the |
| 1708 | * real transid recorded. |
| 1709 | * |
| 1710 | * We set last_trans now to the fs_info generation + 1, |
| 1711 | * this will either be one more than the running transaction |
| 1712 | * or the generation used for the next transaction if there isn't |
| 1713 | * one running right now. |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1714 | * |
| 1715 | * We also have to set last_sub_trans to the current log transid, |
| 1716 | * otherwise subsequent syncs to a file that's been synced in this |
| 1717 | * transaction will appear to have already occured. |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1718 | */ |
| 1719 | BTRFS_I(inode)->last_trans = root->fs_info->generation + 1; |
Josef Bacik | 6c760c0 | 2012-11-09 10:53:21 -0500 | [diff] [blame] | 1720 | BTRFS_I(inode)->last_sub_trans = root->log_transid; |
Christoph Hellwig | 02afc27 | 2013-09-04 15:04:40 +0200 | [diff] [blame] | 1721 | if (num_written > 0) { |
Josef Bacik | d0215f3 | 2011-01-25 14:57:24 -0500 | [diff] [blame] | 1722 | err = generic_write_sync(file, pos, num_written); |
| 1723 | if (err < 0 && num_written > 0) |
Chris Mason | 2ff3e9b | 2007-10-29 14:36:41 -0400 | [diff] [blame] | 1724 | num_written = err; |
| 1725 | } |
Miao Xie | 0a3404d | 2013-01-28 12:34:55 +0000 | [diff] [blame] | 1726 | |
Josef Bacik | b812ce2 | 2012-11-16 13:56:32 -0500 | [diff] [blame] | 1727 | if (sync) |
| 1728 | atomic_dec(&BTRFS_I(inode)->sync_writers); |
Miao Xie | 0a3404d | 2013-01-28 12:34:55 +0000 | [diff] [blame] | 1729 | out: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1730 | current->backing_dev_info = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1731 | return num_written ? num_written : err; |
| 1732 | } |
| 1733 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1734 | int btrfs_release_file(struct inode *inode, struct file *filp) |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 1735 | { |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1736 | /* |
| 1737 | * ordered_data_close is set by settattr when we are about to truncate |
| 1738 | * a file from a non-zero size to a zero size. This tries to |
| 1739 | * flush down new bytes that may have been written if the |
| 1740 | * application were using truncate to replace a file in place. |
| 1741 | */ |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 1742 | if (test_and_clear_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
| 1743 | &BTRFS_I(inode)->runtime_flags)) { |
Josef Bacik | 569e0f3 | 2013-02-13 11:09:14 -0500 | [diff] [blame] | 1744 | struct btrfs_trans_handle *trans; |
| 1745 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1746 | |
| 1747 | /* |
| 1748 | * We need to block on a committing transaction to keep us from |
| 1749 | * throwing a ordered operation on to the list and causing |
| 1750 | * something like sync to deadlock trying to flush out this |
| 1751 | * inode. |
| 1752 | */ |
| 1753 | trans = btrfs_start_transaction(root, 0); |
| 1754 | if (IS_ERR(trans)) |
| 1755 | return PTR_ERR(trans); |
| 1756 | btrfs_add_ordered_operation(trans, BTRFS_I(inode)->root, inode); |
| 1757 | btrfs_end_transaction(trans, root); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 1758 | if (inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
| 1759 | filemap_flush(inode->i_mapping); |
| 1760 | } |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 1761 | if (filp->private_data) |
| 1762 | btrfs_ioctl_trans_end(filp); |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 1763 | return 0; |
| 1764 | } |
| 1765 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1766 | /* |
| 1767 | * fsync call for both files and directories. This logs the inode into |
| 1768 | * the tree log instead of forcing full commits whenever possible. |
| 1769 | * |
| 1770 | * It needs to call filemap_fdatawait so that all ordered extent updates are |
| 1771 | * in the metadata btree are up to date for copying to the log. |
| 1772 | * |
| 1773 | * It drops the inode mutex before doing the tree log commit. This is an |
| 1774 | * important optimization for directories because holding the mutex prevents |
| 1775 | * new operations on the dir while we write to disk. |
| 1776 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1777 | int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1778 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 1779 | struct dentry *dentry = file->f_path.dentry; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1780 | struct inode *inode = dentry->d_inode; |
| 1781 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1782 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1783 | struct btrfs_trans_handle *trans; |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 1784 | bool full_sync = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1785 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 1786 | trace_btrfs_sync_file(file, datasync); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1787 | |
Miao Xie | 90abccf | 2012-09-13 04:53:47 -0600 | [diff] [blame] | 1788 | /* |
| 1789 | * We write the dirty pages in the range and wait until they complete |
| 1790 | * out of the ->i_mutex. If so, we can flush the dirty pages by |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 1791 | * multi-task, and make the performance up. See |
| 1792 | * btrfs_wait_ordered_range for an explanation of the ASYNC check. |
Miao Xie | 90abccf | 2012-09-13 04:53:47 -0600 | [diff] [blame] | 1793 | */ |
Josef Bacik | b812ce2 | 2012-11-16 13:56:32 -0500 | [diff] [blame] | 1794 | atomic_inc(&BTRFS_I(inode)->sync_writers); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 1795 | ret = filemap_fdatawrite_range(inode->i_mapping, start, end); |
| 1796 | if (!ret && test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
| 1797 | &BTRFS_I(inode)->runtime_flags)) |
| 1798 | ret = filemap_fdatawrite_range(inode->i_mapping, start, end); |
Josef Bacik | b812ce2 | 2012-11-16 13:56:32 -0500 | [diff] [blame] | 1799 | atomic_dec(&BTRFS_I(inode)->sync_writers); |
Miao Xie | 90abccf | 2012-09-13 04:53:47 -0600 | [diff] [blame] | 1800 | if (ret) |
| 1801 | return ret; |
| 1802 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1803 | mutex_lock(&inode->i_mutex); |
| 1804 | |
Josef Bacik | 0885ef5 | 2012-04-23 15:09:39 -0400 | [diff] [blame] | 1805 | /* |
Miao Xie | 90abccf | 2012-09-13 04:53:47 -0600 | [diff] [blame] | 1806 | * We flush the dirty pages again to avoid some dirty pages in the |
| 1807 | * range being left. |
Josef Bacik | 0885ef5 | 2012-04-23 15:09:39 -0400 | [diff] [blame] | 1808 | */ |
Miao Xie | 2ecb792 | 2012-09-06 04:04:27 -0600 | [diff] [blame] | 1809 | atomic_inc(&root->log_batch); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 1810 | full_sync = test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 1811 | &BTRFS_I(inode)->runtime_flags); |
| 1812 | if (full_sync) |
| 1813 | btrfs_wait_ordered_range(inode, start, end - start + 1); |
Miao Xie | 2ecb792 | 2012-09-06 04:04:27 -0600 | [diff] [blame] | 1814 | atomic_inc(&root->log_batch); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1815 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1816 | /* |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1817 | * check the transaction that last modified this inode |
| 1818 | * and see if its already been committed |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1819 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1820 | if (!BTRFS_I(inode)->last_trans) { |
| 1821 | mutex_unlock(&inode->i_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1822 | goto out; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1823 | } |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1824 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1825 | /* |
| 1826 | * if the last transaction that changed this file was before |
| 1827 | * the current transaction, we can bail out now without any |
| 1828 | * syncing |
| 1829 | */ |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 1830 | smp_mb(); |
Josef Bacik | 22ee698 | 2012-05-29 16:57:49 -0400 | [diff] [blame] | 1831 | if (btrfs_inode_in_log(inode, root->fs_info->generation) || |
| 1832 | BTRFS_I(inode)->last_trans <= |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1833 | root->fs_info->last_trans_committed) { |
| 1834 | BTRFS_I(inode)->last_trans = 0; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 1835 | |
| 1836 | /* |
| 1837 | * We'v had everything committed since the last time we were |
| 1838 | * modified so clear this flag in case it was set for whatever |
| 1839 | * reason, it's no longer relevant. |
| 1840 | */ |
| 1841 | clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 1842 | &BTRFS_I(inode)->runtime_flags); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1843 | mutex_unlock(&inode->i_mutex); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1844 | goto out; |
| 1845 | } |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 1846 | |
| 1847 | /* |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1848 | * ok we haven't committed the transaction yet, lets do a commit |
| 1849 | */ |
Dan Carpenter | 6f902af | 2010-05-29 09:49:07 +0000 | [diff] [blame] | 1850 | if (file->private_data) |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 1851 | btrfs_ioctl_trans_end(file); |
| 1852 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1853 | trans = btrfs_start_transaction(root, 0); |
| 1854 | if (IS_ERR(trans)) { |
| 1855 | ret = PTR_ERR(trans); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1856 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1857 | goto out; |
| 1858 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1859 | |
Chris Mason | 2cfbd50 | 2009-02-20 10:55:10 -0500 | [diff] [blame] | 1860 | ret = btrfs_log_dentry_safe(trans, root, dentry); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1861 | if (ret < 0) { |
| 1862 | mutex_unlock(&inode->i_mutex); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1863 | goto out; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1864 | } |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 1865 | |
| 1866 | /* we've logged all the items and now have a consistent |
| 1867 | * version of the file in the log. It is possible that |
| 1868 | * someone will come in and modify the file, but that's |
| 1869 | * fine because the log is consistent on disk, and we |
| 1870 | * have references to all of the file's extents |
| 1871 | * |
| 1872 | * It is possible that someone will come in and log the |
| 1873 | * file again, but that will end up using the synchronization |
| 1874 | * inside btrfs_sync_log to keep things safe. |
| 1875 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 1876 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 1877 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1878 | if (ret != BTRFS_NO_LOG_SYNC) { |
| 1879 | if (ret > 0) { |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 1880 | /* |
| 1881 | * If we didn't already wait for ordered extents we need |
| 1882 | * to do that now. |
| 1883 | */ |
| 1884 | if (!full_sync) |
| 1885 | btrfs_wait_ordered_range(inode, start, |
| 1886 | end - start + 1); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 1887 | ret = btrfs_commit_transaction(trans, root); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1888 | } else { |
| 1889 | ret = btrfs_sync_log(trans, root); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 1890 | if (ret == 0) { |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1891 | ret = btrfs_end_transaction(trans, root); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 1892 | } else { |
| 1893 | if (!full_sync) |
| 1894 | btrfs_wait_ordered_range(inode, start, |
| 1895 | end - |
| 1896 | start + 1); |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1897 | ret = btrfs_commit_transaction(trans, root); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 1898 | } |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 1899 | } |
| 1900 | } else { |
| 1901 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1902 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1903 | out: |
Roel Kluin | 014e4ac | 2010-01-29 10:42:11 +0000 | [diff] [blame] | 1904 | return ret > 0 ? -EIO : ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1905 | } |
| 1906 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 1907 | static const struct vm_operations_struct btrfs_file_vm_ops = { |
Chris Mason | 92fee66 | 2007-07-25 12:31:35 -0400 | [diff] [blame] | 1908 | .fault = filemap_fault, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1909 | .page_mkwrite = btrfs_page_mkwrite, |
Konstantin Khlebnikov | 0b173bc | 2012-10-08 16:28:46 -0700 | [diff] [blame] | 1910 | .remap_pages = generic_file_remap_pages, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1911 | }; |
| 1912 | |
| 1913 | static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) |
| 1914 | { |
Miao Xie | 058a457 | 2010-05-20 07:21:50 +0000 | [diff] [blame] | 1915 | struct address_space *mapping = filp->f_mapping; |
| 1916 | |
| 1917 | if (!mapping->a_ops->readpage) |
| 1918 | return -ENOEXEC; |
| 1919 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1920 | file_accessed(filp); |
Miao Xie | 058a457 | 2010-05-20 07:21:50 +0000 | [diff] [blame] | 1921 | vma->vm_ops = &btrfs_file_vm_ops; |
Miao Xie | 058a457 | 2010-05-20 07:21:50 +0000 | [diff] [blame] | 1922 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 1923 | return 0; |
| 1924 | } |
| 1925 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 1926 | static int hole_mergeable(struct inode *inode, struct extent_buffer *leaf, |
| 1927 | int slot, u64 start, u64 end) |
| 1928 | { |
| 1929 | struct btrfs_file_extent_item *fi; |
| 1930 | struct btrfs_key key; |
| 1931 | |
| 1932 | if (slot < 0 || slot >= btrfs_header_nritems(leaf)) |
| 1933 | return 0; |
| 1934 | |
| 1935 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 1936 | if (key.objectid != btrfs_ino(inode) || |
| 1937 | key.type != BTRFS_EXTENT_DATA_KEY) |
| 1938 | return 0; |
| 1939 | |
| 1940 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 1941 | |
| 1942 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) |
| 1943 | return 0; |
| 1944 | |
| 1945 | if (btrfs_file_extent_disk_bytenr(leaf, fi)) |
| 1946 | return 0; |
| 1947 | |
| 1948 | if (key.offset == end) |
| 1949 | return 1; |
| 1950 | if (key.offset + btrfs_file_extent_num_bytes(leaf, fi) == start) |
| 1951 | return 1; |
| 1952 | return 0; |
| 1953 | } |
| 1954 | |
| 1955 | static int fill_holes(struct btrfs_trans_handle *trans, struct inode *inode, |
| 1956 | struct btrfs_path *path, u64 offset, u64 end) |
| 1957 | { |
| 1958 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1959 | struct extent_buffer *leaf; |
| 1960 | struct btrfs_file_extent_item *fi; |
| 1961 | struct extent_map *hole_em; |
| 1962 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 1963 | struct btrfs_key key; |
| 1964 | int ret; |
| 1965 | |
| 1966 | key.objectid = btrfs_ino(inode); |
| 1967 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 1968 | key.offset = offset; |
| 1969 | |
| 1970 | |
| 1971 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 1972 | if (ret < 0) |
| 1973 | return ret; |
| 1974 | BUG_ON(!ret); |
| 1975 | |
| 1976 | leaf = path->nodes[0]; |
| 1977 | if (hole_mergeable(inode, leaf, path->slots[0]-1, offset, end)) { |
| 1978 | u64 num_bytes; |
| 1979 | |
| 1980 | path->slots[0]--; |
| 1981 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1982 | struct btrfs_file_extent_item); |
| 1983 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi) + |
| 1984 | end - offset; |
| 1985 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); |
| 1986 | btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes); |
| 1987 | btrfs_set_file_extent_offset(leaf, fi, 0); |
| 1988 | btrfs_mark_buffer_dirty(leaf); |
| 1989 | goto out; |
| 1990 | } |
| 1991 | |
| 1992 | if (hole_mergeable(inode, leaf, path->slots[0]+1, offset, end)) { |
| 1993 | u64 num_bytes; |
| 1994 | |
| 1995 | path->slots[0]++; |
| 1996 | key.offset = offset; |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 1997 | btrfs_set_item_key_safe(root, path, &key); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 1998 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1999 | struct btrfs_file_extent_item); |
| 2000 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi) + end - |
| 2001 | offset; |
| 2002 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); |
| 2003 | btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes); |
| 2004 | btrfs_set_file_extent_offset(leaf, fi, 0); |
| 2005 | btrfs_mark_buffer_dirty(leaf); |
| 2006 | goto out; |
| 2007 | } |
| 2008 | btrfs_release_path(path); |
| 2009 | |
| 2010 | ret = btrfs_insert_file_extent(trans, root, btrfs_ino(inode), offset, |
| 2011 | 0, 0, end - offset, 0, end - offset, |
| 2012 | 0, 0, 0); |
| 2013 | if (ret) |
| 2014 | return ret; |
| 2015 | |
| 2016 | out: |
| 2017 | btrfs_release_path(path); |
| 2018 | |
| 2019 | hole_em = alloc_extent_map(); |
| 2020 | if (!hole_em) { |
| 2021 | btrfs_drop_extent_cache(inode, offset, end - 1, 0); |
| 2022 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 2023 | &BTRFS_I(inode)->runtime_flags); |
| 2024 | } else { |
| 2025 | hole_em->start = offset; |
| 2026 | hole_em->len = end - offset; |
Josef Bacik | cc95bef | 2013-04-04 14:31:27 -0400 | [diff] [blame] | 2027 | hole_em->ram_bytes = hole_em->len; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2028 | hole_em->orig_start = offset; |
| 2029 | |
| 2030 | hole_em->block_start = EXTENT_MAP_HOLE; |
| 2031 | hole_em->block_len = 0; |
Josef Bacik | b493968 | 2012-12-03 10:31:19 -0500 | [diff] [blame] | 2032 | hole_em->orig_block_len = 0; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2033 | hole_em->bdev = root->fs_info->fs_devices->latest_bdev; |
| 2034 | hole_em->compress_type = BTRFS_COMPRESS_NONE; |
| 2035 | hole_em->generation = trans->transid; |
| 2036 | |
| 2037 | do { |
| 2038 | btrfs_drop_extent_cache(inode, offset, end - 1, 0); |
| 2039 | write_lock(&em_tree->lock); |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 2040 | ret = add_extent_mapping(em_tree, hole_em, 1); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2041 | write_unlock(&em_tree->lock); |
| 2042 | } while (ret == -EEXIST); |
| 2043 | free_extent_map(hole_em); |
| 2044 | if (ret) |
| 2045 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 2046 | &BTRFS_I(inode)->runtime_flags); |
| 2047 | } |
| 2048 | |
| 2049 | return 0; |
| 2050 | } |
| 2051 | |
| 2052 | static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) |
| 2053 | { |
| 2054 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2055 | struct extent_state *cached_state = NULL; |
| 2056 | struct btrfs_path *path; |
| 2057 | struct btrfs_block_rsv *rsv; |
| 2058 | struct btrfs_trans_handle *trans; |
Miao Xie | 0061280 | 2012-12-05 10:54:12 +0000 | [diff] [blame] | 2059 | u64 lockstart = round_up(offset, BTRFS_I(inode)->root->sectorsize); |
| 2060 | u64 lockend = round_down(offset + len, |
| 2061 | BTRFS_I(inode)->root->sectorsize) - 1; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2062 | u64 cur_offset = lockstart; |
| 2063 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
| 2064 | u64 drop_end; |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2065 | int ret = 0; |
| 2066 | int err = 0; |
Miao Xie | 6347b3c | 2012-12-05 10:53:45 +0000 | [diff] [blame] | 2067 | bool same_page = ((offset >> PAGE_CACHE_SHIFT) == |
| 2068 | ((offset + len - 1) >> PAGE_CACHE_SHIFT)); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2069 | |
| 2070 | btrfs_wait_ordered_range(inode, offset, len); |
| 2071 | |
| 2072 | mutex_lock(&inode->i_mutex); |
Miao Xie | 7426cc0 | 2012-12-05 10:54:52 +0000 | [diff] [blame] | 2073 | /* |
| 2074 | * We needn't truncate any page which is beyond the end of the file |
| 2075 | * because we are sure there is no data there. |
| 2076 | */ |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2077 | /* |
| 2078 | * Only do this if we are in the same page and we aren't doing the |
| 2079 | * entire page. |
| 2080 | */ |
| 2081 | if (same_page && len < PAGE_CACHE_SIZE) { |
Miao Xie | 7426cc0 | 2012-12-05 10:54:52 +0000 | [diff] [blame] | 2082 | if (offset < round_up(inode->i_size, PAGE_CACHE_SIZE)) |
| 2083 | ret = btrfs_truncate_page(inode, offset, len, 0); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2084 | mutex_unlock(&inode->i_mutex); |
| 2085 | return ret; |
| 2086 | } |
| 2087 | |
| 2088 | /* zero back part of the first page */ |
Miao Xie | 7426cc0 | 2012-12-05 10:54:52 +0000 | [diff] [blame] | 2089 | if (offset < round_up(inode->i_size, PAGE_CACHE_SIZE)) { |
| 2090 | ret = btrfs_truncate_page(inode, offset, 0, 0); |
| 2091 | if (ret) { |
| 2092 | mutex_unlock(&inode->i_mutex); |
| 2093 | return ret; |
| 2094 | } |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2095 | } |
| 2096 | |
| 2097 | /* zero the front end of the last page */ |
Miao Xie | 0061280 | 2012-12-05 10:54:12 +0000 | [diff] [blame] | 2098 | if (offset + len < round_up(inode->i_size, PAGE_CACHE_SIZE)) { |
| 2099 | ret = btrfs_truncate_page(inode, offset + len, 0, 1); |
| 2100 | if (ret) { |
| 2101 | mutex_unlock(&inode->i_mutex); |
| 2102 | return ret; |
| 2103 | } |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2104 | } |
| 2105 | |
| 2106 | if (lockend < lockstart) { |
| 2107 | mutex_unlock(&inode->i_mutex); |
| 2108 | return 0; |
| 2109 | } |
| 2110 | |
| 2111 | while (1) { |
| 2112 | struct btrfs_ordered_extent *ordered; |
| 2113 | |
| 2114 | truncate_pagecache_range(inode, lockstart, lockend); |
| 2115 | |
| 2116 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 2117 | 0, &cached_state); |
| 2118 | ordered = btrfs_lookup_first_ordered_extent(inode, lockend); |
| 2119 | |
| 2120 | /* |
| 2121 | * We need to make sure we have no ordered extents in this range |
| 2122 | * and nobody raced in and read a page in this range, if we did |
| 2123 | * we need to try again. |
| 2124 | */ |
| 2125 | if ((!ordered || |
| 2126 | (ordered->file_offset + ordered->len < lockstart || |
| 2127 | ordered->file_offset > lockend)) && |
| 2128 | !test_range_bit(&BTRFS_I(inode)->io_tree, lockstart, |
| 2129 | lockend, EXTENT_UPTODATE, 0, |
| 2130 | cached_state)) { |
| 2131 | if (ordered) |
| 2132 | btrfs_put_ordered_extent(ordered); |
| 2133 | break; |
| 2134 | } |
| 2135 | if (ordered) |
| 2136 | btrfs_put_ordered_extent(ordered); |
| 2137 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, |
| 2138 | lockend, &cached_state, GFP_NOFS); |
| 2139 | btrfs_wait_ordered_range(inode, lockstart, |
| 2140 | lockend - lockstart + 1); |
| 2141 | } |
| 2142 | |
| 2143 | path = btrfs_alloc_path(); |
| 2144 | if (!path) { |
| 2145 | ret = -ENOMEM; |
| 2146 | goto out; |
| 2147 | } |
| 2148 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 2149 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2150 | if (!rsv) { |
| 2151 | ret = -ENOMEM; |
| 2152 | goto out_free; |
| 2153 | } |
| 2154 | rsv->size = btrfs_calc_trunc_metadata_size(root, 1); |
| 2155 | rsv->failfast = 1; |
| 2156 | |
| 2157 | /* |
| 2158 | * 1 - update the inode |
| 2159 | * 1 - removing the extents in the range |
| 2160 | * 1 - adding the hole extent |
| 2161 | */ |
| 2162 | trans = btrfs_start_transaction(root, 3); |
| 2163 | if (IS_ERR(trans)) { |
| 2164 | err = PTR_ERR(trans); |
| 2165 | goto out_free; |
| 2166 | } |
| 2167 | |
| 2168 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, |
| 2169 | min_size); |
| 2170 | BUG_ON(ret); |
| 2171 | trans->block_rsv = rsv; |
| 2172 | |
| 2173 | while (cur_offset < lockend) { |
| 2174 | ret = __btrfs_drop_extents(trans, root, inode, path, |
| 2175 | cur_offset, lockend + 1, |
| 2176 | &drop_end, 1); |
| 2177 | if (ret != -ENOSPC) |
| 2178 | break; |
| 2179 | |
| 2180 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
| 2181 | |
| 2182 | ret = fill_holes(trans, inode, path, cur_offset, drop_end); |
| 2183 | if (ret) { |
| 2184 | err = ret; |
| 2185 | break; |
| 2186 | } |
| 2187 | |
| 2188 | cur_offset = drop_end; |
| 2189 | |
| 2190 | ret = btrfs_update_inode(trans, root, inode); |
| 2191 | if (ret) { |
| 2192 | err = ret; |
| 2193 | break; |
| 2194 | } |
| 2195 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2196 | btrfs_end_transaction(trans, root); |
Liu Bo | b53d3f5 | 2012-11-14 14:34:34 +0000 | [diff] [blame] | 2197 | btrfs_btree_balance_dirty(root); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2198 | |
| 2199 | trans = btrfs_start_transaction(root, 3); |
| 2200 | if (IS_ERR(trans)) { |
| 2201 | ret = PTR_ERR(trans); |
| 2202 | trans = NULL; |
| 2203 | break; |
| 2204 | } |
| 2205 | |
| 2206 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, |
| 2207 | rsv, min_size); |
| 2208 | BUG_ON(ret); /* shouldn't happen */ |
| 2209 | trans->block_rsv = rsv; |
| 2210 | } |
| 2211 | |
| 2212 | if (ret) { |
| 2213 | err = ret; |
| 2214 | goto out_trans; |
| 2215 | } |
| 2216 | |
| 2217 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
| 2218 | ret = fill_holes(trans, inode, path, cur_offset, drop_end); |
| 2219 | if (ret) { |
| 2220 | err = ret; |
| 2221 | goto out_trans; |
| 2222 | } |
| 2223 | |
| 2224 | out_trans: |
| 2225 | if (!trans) |
| 2226 | goto out_free; |
| 2227 | |
Tsutomu Itoh | e1f5790 | 2012-11-08 04:47:33 +0000 | [diff] [blame] | 2228 | inode_inc_iversion(inode); |
| 2229 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 2230 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2231 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
| 2232 | ret = btrfs_update_inode(trans, root, inode); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2233 | btrfs_end_transaction(trans, root); |
Liu Bo | b53d3f5 | 2012-11-14 14:34:34 +0000 | [diff] [blame] | 2234 | btrfs_btree_balance_dirty(root); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2235 | out_free: |
| 2236 | btrfs_free_path(path); |
| 2237 | btrfs_free_block_rsv(root, rsv); |
| 2238 | out: |
| 2239 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 2240 | &cached_state, GFP_NOFS); |
| 2241 | mutex_unlock(&inode->i_mutex); |
| 2242 | if (ret && !err) |
| 2243 | err = ret; |
| 2244 | return err; |
| 2245 | } |
| 2246 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2247 | static long btrfs_fallocate(struct file *file, int mode, |
| 2248 | loff_t offset, loff_t len) |
| 2249 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2250 | struct inode *inode = file_inode(file); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2251 | struct extent_state *cached_state = NULL; |
Wang Shilong | 6113077 | 2013-03-19 10:57:14 +0000 | [diff] [blame] | 2252 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2253 | u64 cur_offset; |
| 2254 | u64 last_byte; |
| 2255 | u64 alloc_start; |
| 2256 | u64 alloc_end; |
| 2257 | u64 alloc_hint = 0; |
| 2258 | u64 locked_end; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2259 | struct extent_map *em; |
Miao Xie | 797f427 | 2012-11-28 10:28:07 +0000 | [diff] [blame] | 2260 | int blocksize = BTRFS_I(inode)->root->sectorsize; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2261 | int ret; |
| 2262 | |
Miao Xie | 797f427 | 2012-11-28 10:28:07 +0000 | [diff] [blame] | 2263 | alloc_start = round_down(offset, blocksize); |
| 2264 | alloc_end = round_up(offset + len, blocksize); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2265 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2266 | /* Make sure we aren't being give some crap mode */ |
| 2267 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2268 | return -EOPNOTSUPP; |
| 2269 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame] | 2270 | if (mode & FALLOC_FL_PUNCH_HOLE) |
| 2271 | return btrfs_punch_hole(inode, offset, len); |
| 2272 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2273 | /* |
Chris Mason | d98456f | 2012-01-31 20:27:41 -0500 | [diff] [blame] | 2274 | * Make sure we have enough space before we do the |
| 2275 | * allocation. |
| 2276 | */ |
Miao Xie | 0ff6fab | 2012-11-28 10:28:54 +0000 | [diff] [blame] | 2277 | ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start); |
Chris Mason | d98456f | 2012-01-31 20:27:41 -0500 | [diff] [blame] | 2278 | if (ret) |
| 2279 | return ret; |
Wang Shilong | 6113077 | 2013-03-19 10:57:14 +0000 | [diff] [blame] | 2280 | if (root->fs_info->quota_enabled) { |
| 2281 | ret = btrfs_qgroup_reserve(root, alloc_end - alloc_start); |
| 2282 | if (ret) |
| 2283 | goto out_reserve_fail; |
| 2284 | } |
Chris Mason | d98456f | 2012-01-31 20:27:41 -0500 | [diff] [blame] | 2285 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2286 | mutex_lock(&inode->i_mutex); |
| 2287 | ret = inode_newsize_ok(inode, alloc_end); |
| 2288 | if (ret) |
| 2289 | goto out; |
| 2290 | |
| 2291 | if (alloc_start > inode->i_size) { |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 2292 | ret = btrfs_cont_expand(inode, i_size_read(inode), |
| 2293 | alloc_start); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2294 | if (ret) |
| 2295 | goto out; |
Josef Bacik | a71754f | 2013-06-17 17:14:39 -0400 | [diff] [blame] | 2296 | } else { |
| 2297 | /* |
| 2298 | * If we are fallocating from the end of the file onward we |
| 2299 | * need to zero out the end of the page if i_size lands in the |
| 2300 | * middle of a page. |
| 2301 | */ |
| 2302 | ret = btrfs_truncate_page(inode, inode->i_size, 0, 0); |
| 2303 | if (ret) |
| 2304 | goto out; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2305 | } |
| 2306 | |
Josef Bacik | a71754f | 2013-06-17 17:14:39 -0400 | [diff] [blame] | 2307 | /* |
| 2308 | * wait for ordered IO before we have any locks. We'll loop again |
| 2309 | * below with the locks held. |
| 2310 | */ |
| 2311 | btrfs_wait_ordered_range(inode, alloc_start, alloc_end - alloc_start); |
| 2312 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2313 | locked_end = alloc_end - 1; |
| 2314 | while (1) { |
| 2315 | struct btrfs_ordered_extent *ordered; |
| 2316 | |
| 2317 | /* the extent lock is ordered inside the running |
| 2318 | * transaction |
| 2319 | */ |
| 2320 | lock_extent_bits(&BTRFS_I(inode)->io_tree, alloc_start, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 2321 | locked_end, 0, &cached_state); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2322 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 2323 | alloc_end - 1); |
| 2324 | if (ordered && |
| 2325 | ordered->file_offset + ordered->len > alloc_start && |
| 2326 | ordered->file_offset < alloc_end) { |
| 2327 | btrfs_put_ordered_extent(ordered); |
| 2328 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
| 2329 | alloc_start, locked_end, |
| 2330 | &cached_state, GFP_NOFS); |
| 2331 | /* |
| 2332 | * we can't wait on the range with the transaction |
| 2333 | * running or with the extent lock held |
| 2334 | */ |
| 2335 | btrfs_wait_ordered_range(inode, alloc_start, |
| 2336 | alloc_end - alloc_start); |
| 2337 | } else { |
| 2338 | if (ordered) |
| 2339 | btrfs_put_ordered_extent(ordered); |
| 2340 | break; |
| 2341 | } |
| 2342 | } |
| 2343 | |
| 2344 | cur_offset = alloc_start; |
| 2345 | while (1) { |
Josef Bacik | f1e490a | 2011-08-18 10:36:39 -0400 | [diff] [blame] | 2346 | u64 actual_end; |
| 2347 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2348 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, |
| 2349 | alloc_end - cur_offset, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2350 | if (IS_ERR_OR_NULL(em)) { |
| 2351 | if (!em) |
| 2352 | ret = -ENOMEM; |
| 2353 | else |
| 2354 | ret = PTR_ERR(em); |
| 2355 | break; |
| 2356 | } |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2357 | last_byte = min(extent_map_end(em), alloc_end); |
Josef Bacik | f1e490a | 2011-08-18 10:36:39 -0400 | [diff] [blame] | 2358 | actual_end = min_t(u64, extent_map_end(em), offset + len); |
Miao Xie | 797f427 | 2012-11-28 10:28:07 +0000 | [diff] [blame] | 2359 | last_byte = ALIGN(last_byte, blocksize); |
Josef Bacik | f1e490a | 2011-08-18 10:36:39 -0400 | [diff] [blame] | 2360 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2361 | if (em->block_start == EXTENT_MAP_HOLE || |
| 2362 | (cur_offset >= inode->i_size && |
| 2363 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { |
| 2364 | ret = btrfs_prealloc_file_range(inode, mode, cur_offset, |
| 2365 | last_byte - cur_offset, |
| 2366 | 1 << inode->i_blkbits, |
| 2367 | offset + len, |
| 2368 | &alloc_hint); |
Josef Bacik | 1b9c332 | 2011-08-17 10:19:52 -0400 | [diff] [blame] | 2369 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2370 | if (ret < 0) { |
| 2371 | free_extent_map(em); |
| 2372 | break; |
| 2373 | } |
Josef Bacik | f1e490a | 2011-08-18 10:36:39 -0400 | [diff] [blame] | 2374 | } else if (actual_end > inode->i_size && |
| 2375 | !(mode & FALLOC_FL_KEEP_SIZE)) { |
| 2376 | /* |
| 2377 | * We didn't need to allocate any more space, but we |
| 2378 | * still extended the size of the file so we need to |
| 2379 | * update i_size. |
| 2380 | */ |
| 2381 | inode->i_ctime = CURRENT_TIME; |
| 2382 | i_size_write(inode, actual_end); |
| 2383 | btrfs_ordered_update_i_size(inode, actual_end, NULL); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2384 | } |
| 2385 | free_extent_map(em); |
| 2386 | |
| 2387 | cur_offset = last_byte; |
| 2388 | if (cur_offset >= alloc_end) { |
| 2389 | ret = 0; |
| 2390 | break; |
| 2391 | } |
| 2392 | } |
| 2393 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, alloc_start, locked_end, |
| 2394 | &cached_state, GFP_NOFS); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2395 | out: |
| 2396 | mutex_unlock(&inode->i_mutex); |
Wang Shilong | 6113077 | 2013-03-19 10:57:14 +0000 | [diff] [blame] | 2397 | if (root->fs_info->quota_enabled) |
| 2398 | btrfs_qgroup_free(root, alloc_end - alloc_start); |
| 2399 | out_reserve_fail: |
Chris Mason | d98456f | 2012-01-31 20:27:41 -0500 | [diff] [blame] | 2400 | /* Let go of our reservation. */ |
Miao Xie | 0ff6fab | 2012-11-28 10:28:54 +0000 | [diff] [blame] | 2401 | btrfs_free_reserved_data_space(inode, alloc_end - alloc_start); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2402 | return ret; |
| 2403 | } |
| 2404 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2405 | static int find_desired_extent(struct inode *inode, loff_t *offset, int whence) |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2406 | { |
| 2407 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2408 | struct extent_map *em; |
| 2409 | struct extent_state *cached_state = NULL; |
| 2410 | u64 lockstart = *offset; |
| 2411 | u64 lockend = i_size_read(inode); |
| 2412 | u64 start = *offset; |
| 2413 | u64 orig_start = *offset; |
| 2414 | u64 len = i_size_read(inode); |
| 2415 | u64 last_end = 0; |
| 2416 | int ret = 0; |
| 2417 | |
| 2418 | lockend = max_t(u64, root->sectorsize, lockend); |
| 2419 | if (lockend <= lockstart) |
| 2420 | lockend = lockstart + root->sectorsize; |
| 2421 | |
Liu Bo | 1214b53 | 2013-01-07 03:53:08 +0000 | [diff] [blame] | 2422 | lockend--; |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2423 | len = lockend - lockstart + 1; |
| 2424 | |
| 2425 | len = max_t(u64, len, root->sectorsize); |
| 2426 | if (inode->i_size == 0) |
| 2427 | return -ENXIO; |
| 2428 | |
| 2429 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, 0, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 2430 | &cached_state); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2431 | |
| 2432 | /* |
| 2433 | * Delalloc is such a pain. If we have a hole and we have pending |
| 2434 | * delalloc for a portion of the hole we will get back a hole that |
| 2435 | * exists for the entire range since it hasn't been actually written |
| 2436 | * yet. So to take care of this case we need to look for an extent just |
| 2437 | * before the position we want in case there is outstanding delalloc |
| 2438 | * going on here. |
| 2439 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2440 | if (whence == SEEK_HOLE && start != 0) { |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2441 | if (start <= root->sectorsize) |
| 2442 | em = btrfs_get_extent_fiemap(inode, NULL, 0, 0, |
| 2443 | root->sectorsize, 0); |
| 2444 | else |
| 2445 | em = btrfs_get_extent_fiemap(inode, NULL, 0, |
| 2446 | start - root->sectorsize, |
| 2447 | root->sectorsize, 0); |
| 2448 | if (IS_ERR(em)) { |
Jeff Liu | 6af021d | 2012-02-09 14:25:50 +0800 | [diff] [blame] | 2449 | ret = PTR_ERR(em); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2450 | goto out; |
| 2451 | } |
| 2452 | last_end = em->start + em->len; |
| 2453 | if (em->block_start == EXTENT_MAP_DELALLOC) |
| 2454 | last_end = min_t(u64, last_end, inode->i_size); |
| 2455 | free_extent_map(em); |
| 2456 | } |
| 2457 | |
| 2458 | while (1) { |
| 2459 | em = btrfs_get_extent_fiemap(inode, NULL, 0, start, len, 0); |
| 2460 | if (IS_ERR(em)) { |
Jeff Liu | 6af021d | 2012-02-09 14:25:50 +0800 | [diff] [blame] | 2461 | ret = PTR_ERR(em); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2462 | break; |
| 2463 | } |
| 2464 | |
| 2465 | if (em->block_start == EXTENT_MAP_HOLE) { |
| 2466 | if (test_bit(EXTENT_FLAG_VACANCY, &em->flags)) { |
| 2467 | if (last_end <= orig_start) { |
| 2468 | free_extent_map(em); |
| 2469 | ret = -ENXIO; |
| 2470 | break; |
| 2471 | } |
| 2472 | } |
| 2473 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2474 | if (whence == SEEK_HOLE) { |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2475 | *offset = start; |
| 2476 | free_extent_map(em); |
| 2477 | break; |
| 2478 | } |
| 2479 | } else { |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2480 | if (whence == SEEK_DATA) { |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2481 | if (em->block_start == EXTENT_MAP_DELALLOC) { |
| 2482 | if (start >= inode->i_size) { |
| 2483 | free_extent_map(em); |
| 2484 | ret = -ENXIO; |
| 2485 | break; |
| 2486 | } |
| 2487 | } |
| 2488 | |
Liu Bo | f9e4fb5 | 2013-01-07 10:10:12 +0000 | [diff] [blame] | 2489 | if (!test_bit(EXTENT_FLAG_PREALLOC, |
| 2490 | &em->flags)) { |
| 2491 | *offset = start; |
| 2492 | free_extent_map(em); |
| 2493 | break; |
| 2494 | } |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2495 | } |
| 2496 | } |
| 2497 | |
| 2498 | start = em->start + em->len; |
| 2499 | last_end = em->start + em->len; |
| 2500 | |
| 2501 | if (em->block_start == EXTENT_MAP_DELALLOC) |
| 2502 | last_end = min_t(u64, last_end, inode->i_size); |
| 2503 | |
| 2504 | if (test_bit(EXTENT_FLAG_VACANCY, &em->flags)) { |
| 2505 | free_extent_map(em); |
| 2506 | ret = -ENXIO; |
| 2507 | break; |
| 2508 | } |
| 2509 | free_extent_map(em); |
| 2510 | cond_resched(); |
| 2511 | } |
| 2512 | if (!ret) |
| 2513 | *offset = min(*offset, inode->i_size); |
| 2514 | out: |
| 2515 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 2516 | &cached_state, GFP_NOFS); |
| 2517 | return ret; |
| 2518 | } |
| 2519 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2520 | static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence) |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2521 | { |
| 2522 | struct inode *inode = file->f_mapping->host; |
| 2523 | int ret; |
| 2524 | |
| 2525 | mutex_lock(&inode->i_mutex); |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2526 | switch (whence) { |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2527 | case SEEK_END: |
| 2528 | case SEEK_CUR: |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2529 | offset = generic_file_llseek(file, offset, whence); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2530 | goto out; |
| 2531 | case SEEK_DATA: |
| 2532 | case SEEK_HOLE: |
Jeff Liu | 48802c8 | 2011-09-18 10:34:02 -0400 | [diff] [blame] | 2533 | if (offset >= i_size_read(inode)) { |
| 2534 | mutex_unlock(&inode->i_mutex); |
| 2535 | return -ENXIO; |
| 2536 | } |
| 2537 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 2538 | ret = find_desired_extent(inode, &offset, whence); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2539 | if (ret) { |
| 2540 | mutex_unlock(&inode->i_mutex); |
| 2541 | return ret; |
| 2542 | } |
| 2543 | } |
| 2544 | |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 2545 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2546 | out: |
| 2547 | mutex_unlock(&inode->i_mutex); |
| 2548 | return offset; |
| 2549 | } |
| 2550 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2551 | const struct file_operations btrfs_file_operations = { |
Josef Bacik | b267515 | 2011-07-18 13:21:36 -0400 | [diff] [blame] | 2552 | .llseek = btrfs_file_llseek, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2553 | .read = do_sync_read, |
Miao Xie | 4a001071 | 2010-06-07 03:38:51 +0000 | [diff] [blame] | 2554 | .write = do_sync_write, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 2555 | .aio_read = generic_file_aio_read, |
Chris Mason | e9906a9 | 2007-12-14 12:56:58 -0500 | [diff] [blame] | 2556 | .splice_read = generic_file_splice_read, |
Josef Bacik | 11c65dc | 2010-05-23 11:07:21 -0400 | [diff] [blame] | 2557 | .aio_write = btrfs_file_aio_write, |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 2558 | .mmap = btrfs_file_mmap, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2559 | .open = generic_file_open, |
Mingming | e1b81e6 | 2008-05-27 10:55:43 -0400 | [diff] [blame] | 2560 | .release = btrfs_release_file, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2561 | .fsync = btrfs_sync_file, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 2562 | .fallocate = btrfs_fallocate, |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 2563 | .unlocked_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2564 | #ifdef CONFIG_COMPAT |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 2565 | .compat_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2566 | #endif |
| 2567 | }; |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 2568 | |
| 2569 | void btrfs_auto_defrag_exit(void) |
| 2570 | { |
| 2571 | if (btrfs_inode_defrag_cachep) |
| 2572 | kmem_cache_destroy(btrfs_inode_defrag_cachep); |
| 2573 | } |
| 2574 | |
| 2575 | int btrfs_auto_defrag_init(void) |
| 2576 | { |
| 2577 | btrfs_inode_defrag_cachep = kmem_cache_create("btrfs_inode_defrag", |
| 2578 | sizeof(struct inode_defrag), 0, |
| 2579 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, |
| 2580 | NULL); |
| 2581 | if (!btrfs_inode_defrag_cachep) |
| 2582 | return -ENOMEM; |
| 2583 | |
| 2584 | return 0; |
| 2585 | } |