Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009 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 | |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/pagemap.h> |
| 21 | #include <linux/writeback.h> |
| 22 | #include <linux/blkdev.h> |
| 23 | #include <linux/rbtree.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 25 | #include "ctree.h" |
| 26 | #include "disk-io.h" |
| 27 | #include "transaction.h" |
| 28 | #include "volumes.h" |
| 29 | #include "locking.h" |
| 30 | #include "btrfs_inode.h" |
| 31 | #include "async-thread.h" |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 32 | #include "free-space-cache.h" |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 33 | #include "inode-map.h" |
Qu Wenruo | 62b9954 | 2016-08-15 10:36:51 +0800 | [diff] [blame] | 34 | #include "qgroup.h" |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 35 | |
| 36 | /* |
| 37 | * backref_node, mapping_node and tree_block start with this |
| 38 | */ |
| 39 | struct tree_entry { |
| 40 | struct rb_node rb_node; |
| 41 | u64 bytenr; |
| 42 | }; |
| 43 | |
| 44 | /* |
| 45 | * present a tree block in the backref cache |
| 46 | */ |
| 47 | struct backref_node { |
| 48 | struct rb_node rb_node; |
| 49 | u64 bytenr; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 50 | |
| 51 | u64 new_bytenr; |
| 52 | /* objectid of tree block owner, can be not uptodate */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 53 | u64 owner; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 54 | /* link to pending, changed or detached list */ |
| 55 | struct list_head list; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 56 | /* list of upper level blocks reference this block */ |
| 57 | struct list_head upper; |
| 58 | /* list of child blocks in the cache */ |
| 59 | struct list_head lower; |
| 60 | /* NULL if this node is not tree root */ |
| 61 | struct btrfs_root *root; |
| 62 | /* extent buffer got by COW the block */ |
| 63 | struct extent_buffer *eb; |
| 64 | /* level of tree block */ |
| 65 | unsigned int level:8; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 66 | /* is the block in non-reference counted tree */ |
| 67 | unsigned int cowonly:1; |
| 68 | /* 1 if no child node in the cache */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 69 | unsigned int lowest:1; |
| 70 | /* is the extent buffer locked */ |
| 71 | unsigned int locked:1; |
| 72 | /* has the block been processed */ |
| 73 | unsigned int processed:1; |
| 74 | /* have backrefs of this block been checked */ |
| 75 | unsigned int checked:1; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 76 | /* |
| 77 | * 1 if corresponding block has been cowed but some upper |
| 78 | * level block pointers may not point to the new location |
| 79 | */ |
| 80 | unsigned int pending:1; |
| 81 | /* |
| 82 | * 1 if the backref node isn't connected to any other |
| 83 | * backref node. |
| 84 | */ |
| 85 | unsigned int detached:1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 86 | }; |
| 87 | |
| 88 | /* |
| 89 | * present a block pointer in the backref cache |
| 90 | */ |
| 91 | struct backref_edge { |
| 92 | struct list_head list[2]; |
| 93 | struct backref_node *node[2]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 94 | }; |
| 95 | |
| 96 | #define LOWER 0 |
| 97 | #define UPPER 1 |
Wang Shilong | 0647bf5 | 2013-11-20 09:01:52 +0800 | [diff] [blame] | 98 | #define RELOCATION_RESERVED_NODES 256 |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 99 | |
| 100 | struct backref_cache { |
| 101 | /* red black tree of all backref nodes in the cache */ |
| 102 | struct rb_root rb_root; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 103 | /* for passing backref nodes to btrfs_reloc_cow_block */ |
| 104 | struct backref_node *path[BTRFS_MAX_LEVEL]; |
| 105 | /* |
| 106 | * list of blocks that have been cowed but some block |
| 107 | * pointers in upper level blocks may not reflect the |
| 108 | * new location |
| 109 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 110 | struct list_head pending[BTRFS_MAX_LEVEL]; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 111 | /* list of backref nodes with no child node */ |
| 112 | struct list_head leaves; |
| 113 | /* list of blocks that have been cowed in current transaction */ |
| 114 | struct list_head changed; |
| 115 | /* list of detached backref node. */ |
| 116 | struct list_head detached; |
| 117 | |
| 118 | u64 last_trans; |
| 119 | |
| 120 | int nr_nodes; |
| 121 | int nr_edges; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 122 | }; |
| 123 | |
| 124 | /* |
| 125 | * map address of tree root to tree |
| 126 | */ |
| 127 | struct mapping_node { |
| 128 | struct rb_node rb_node; |
| 129 | u64 bytenr; |
| 130 | void *data; |
| 131 | }; |
| 132 | |
| 133 | struct mapping_tree { |
| 134 | struct rb_root rb_root; |
| 135 | spinlock_t lock; |
| 136 | }; |
| 137 | |
| 138 | /* |
| 139 | * present a tree block to process |
| 140 | */ |
| 141 | struct tree_block { |
| 142 | struct rb_node rb_node; |
| 143 | u64 bytenr; |
| 144 | struct btrfs_key key; |
| 145 | unsigned int level:8; |
| 146 | unsigned int key_ready:1; |
| 147 | }; |
| 148 | |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 149 | #define MAX_EXTENTS 128 |
| 150 | |
| 151 | struct file_extent_cluster { |
| 152 | u64 start; |
| 153 | u64 end; |
| 154 | u64 boundary[MAX_EXTENTS]; |
| 155 | unsigned int nr; |
| 156 | }; |
| 157 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 158 | struct reloc_control { |
| 159 | /* block group to relocate */ |
| 160 | struct btrfs_block_group_cache *block_group; |
| 161 | /* extent tree */ |
| 162 | struct btrfs_root *extent_root; |
| 163 | /* inode for moving data */ |
| 164 | struct inode *data_inode; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 165 | |
| 166 | struct btrfs_block_rsv *block_rsv; |
| 167 | |
| 168 | struct backref_cache backref_cache; |
| 169 | |
| 170 | struct file_extent_cluster cluster; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 171 | /* tree blocks have been processed */ |
| 172 | struct extent_io_tree processed_blocks; |
| 173 | /* map start of tree root to corresponding reloc tree */ |
| 174 | struct mapping_tree reloc_root_tree; |
| 175 | /* list of reloc trees */ |
| 176 | struct list_head reloc_roots; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 177 | /* size of metadata reservation for merging reloc trees */ |
| 178 | u64 merging_rsv_size; |
| 179 | /* size of relocated tree nodes */ |
| 180 | u64 nodes_relocated; |
Wang Shilong | 0647bf5 | 2013-11-20 09:01:52 +0800 | [diff] [blame] | 181 | /* reserved size for block group relocation*/ |
| 182 | u64 reserved_bytes; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 183 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 184 | u64 search_start; |
| 185 | u64 extents_found; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 186 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 187 | unsigned int stage:8; |
| 188 | unsigned int create_reloc_tree:1; |
| 189 | unsigned int merge_reloc_tree:1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 190 | unsigned int found_file_extent:1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 191 | }; |
| 192 | |
| 193 | /* stages of data relocation */ |
| 194 | #define MOVE_DATA_EXTENTS 0 |
| 195 | #define UPDATE_DATA_PTRS 1 |
| 196 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 197 | static void remove_backref_node(struct backref_cache *cache, |
| 198 | struct backref_node *node); |
| 199 | static void __mark_block_processed(struct reloc_control *rc, |
| 200 | struct backref_node *node); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 201 | |
| 202 | static void mapping_tree_init(struct mapping_tree *tree) |
| 203 | { |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 204 | tree->rb_root = RB_ROOT; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 205 | spin_lock_init(&tree->lock); |
| 206 | } |
| 207 | |
| 208 | static void backref_cache_init(struct backref_cache *cache) |
| 209 | { |
| 210 | int i; |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 211 | cache->rb_root = RB_ROOT; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 212 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) |
| 213 | INIT_LIST_HEAD(&cache->pending[i]); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 214 | INIT_LIST_HEAD(&cache->changed); |
| 215 | INIT_LIST_HEAD(&cache->detached); |
| 216 | INIT_LIST_HEAD(&cache->leaves); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 217 | } |
| 218 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 219 | static void backref_cache_cleanup(struct backref_cache *cache) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 220 | { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 221 | struct backref_node *node; |
| 222 | int i; |
| 223 | |
| 224 | while (!list_empty(&cache->detached)) { |
| 225 | node = list_entry(cache->detached.next, |
| 226 | struct backref_node, list); |
| 227 | remove_backref_node(cache, node); |
| 228 | } |
| 229 | |
| 230 | while (!list_empty(&cache->leaves)) { |
| 231 | node = list_entry(cache->leaves.next, |
| 232 | struct backref_node, lower); |
| 233 | remove_backref_node(cache, node); |
| 234 | } |
| 235 | |
| 236 | cache->last_trans = 0; |
| 237 | |
| 238 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) |
Liu Bo | f490709 | 2016-07-11 18:52:57 -0700 | [diff] [blame] | 239 | ASSERT(list_empty(&cache->pending[i])); |
| 240 | ASSERT(list_empty(&cache->changed)); |
| 241 | ASSERT(list_empty(&cache->detached)); |
| 242 | ASSERT(RB_EMPTY_ROOT(&cache->rb_root)); |
| 243 | ASSERT(!cache->nr_nodes); |
| 244 | ASSERT(!cache->nr_edges); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | static struct backref_node *alloc_backref_node(struct backref_cache *cache) |
| 248 | { |
| 249 | struct backref_node *node; |
| 250 | |
| 251 | node = kzalloc(sizeof(*node), GFP_NOFS); |
| 252 | if (node) { |
| 253 | INIT_LIST_HEAD(&node->list); |
| 254 | INIT_LIST_HEAD(&node->upper); |
| 255 | INIT_LIST_HEAD(&node->lower); |
| 256 | RB_CLEAR_NODE(&node->rb_node); |
| 257 | cache->nr_nodes++; |
| 258 | } |
| 259 | return node; |
| 260 | } |
| 261 | |
| 262 | static void free_backref_node(struct backref_cache *cache, |
| 263 | struct backref_node *node) |
| 264 | { |
| 265 | if (node) { |
| 266 | cache->nr_nodes--; |
| 267 | kfree(node); |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | static struct backref_edge *alloc_backref_edge(struct backref_cache *cache) |
| 272 | { |
| 273 | struct backref_edge *edge; |
| 274 | |
| 275 | edge = kzalloc(sizeof(*edge), GFP_NOFS); |
| 276 | if (edge) |
| 277 | cache->nr_edges++; |
| 278 | return edge; |
| 279 | } |
| 280 | |
| 281 | static void free_backref_edge(struct backref_cache *cache, |
| 282 | struct backref_edge *edge) |
| 283 | { |
| 284 | if (edge) { |
| 285 | cache->nr_edges--; |
| 286 | kfree(edge); |
| 287 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | static struct rb_node *tree_insert(struct rb_root *root, u64 bytenr, |
| 291 | struct rb_node *node) |
| 292 | { |
| 293 | struct rb_node **p = &root->rb_node; |
| 294 | struct rb_node *parent = NULL; |
| 295 | struct tree_entry *entry; |
| 296 | |
| 297 | while (*p) { |
| 298 | parent = *p; |
| 299 | entry = rb_entry(parent, struct tree_entry, rb_node); |
| 300 | |
| 301 | if (bytenr < entry->bytenr) |
| 302 | p = &(*p)->rb_left; |
| 303 | else if (bytenr > entry->bytenr) |
| 304 | p = &(*p)->rb_right; |
| 305 | else |
| 306 | return parent; |
| 307 | } |
| 308 | |
| 309 | rb_link_node(node, parent, p); |
| 310 | rb_insert_color(node, root); |
| 311 | return NULL; |
| 312 | } |
| 313 | |
| 314 | static struct rb_node *tree_search(struct rb_root *root, u64 bytenr) |
| 315 | { |
| 316 | struct rb_node *n = root->rb_node; |
| 317 | struct tree_entry *entry; |
| 318 | |
| 319 | while (n) { |
| 320 | entry = rb_entry(n, struct tree_entry, rb_node); |
| 321 | |
| 322 | if (bytenr < entry->bytenr) |
| 323 | n = n->rb_left; |
| 324 | else if (bytenr > entry->bytenr) |
| 325 | n = n->rb_right; |
| 326 | else |
| 327 | return n; |
| 328 | } |
| 329 | return NULL; |
| 330 | } |
| 331 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 332 | static void backref_tree_panic(struct rb_node *rb_node, int errno, u64 bytenr) |
Jeff Mahoney | 43c04fb | 2011-10-03 23:22:33 -0400 | [diff] [blame] | 333 | { |
| 334 | |
| 335 | struct btrfs_fs_info *fs_info = NULL; |
| 336 | struct backref_node *bnode = rb_entry(rb_node, struct backref_node, |
| 337 | rb_node); |
| 338 | if (bnode->root) |
| 339 | fs_info = bnode->root->fs_info; |
Jeff Mahoney | 5d163e0 | 2016-09-20 10:05:00 -0400 | [diff] [blame] | 340 | btrfs_panic(fs_info, errno, |
| 341 | "Inconsistency in backref cache found at offset %llu", |
| 342 | bytenr); |
Jeff Mahoney | 43c04fb | 2011-10-03 23:22:33 -0400 | [diff] [blame] | 343 | } |
| 344 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 345 | /* |
| 346 | * walk up backref nodes until reach node presents tree root |
| 347 | */ |
| 348 | static struct backref_node *walk_up_backref(struct backref_node *node, |
| 349 | struct backref_edge *edges[], |
| 350 | int *index) |
| 351 | { |
| 352 | struct backref_edge *edge; |
| 353 | int idx = *index; |
| 354 | |
| 355 | while (!list_empty(&node->upper)) { |
| 356 | edge = list_entry(node->upper.next, |
| 357 | struct backref_edge, list[LOWER]); |
| 358 | edges[idx++] = edge; |
| 359 | node = edge->node[UPPER]; |
| 360 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 361 | BUG_ON(node->detached); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 362 | *index = idx; |
| 363 | return node; |
| 364 | } |
| 365 | |
| 366 | /* |
| 367 | * walk down backref nodes to find start of next reference path |
| 368 | */ |
| 369 | static struct backref_node *walk_down_backref(struct backref_edge *edges[], |
| 370 | int *index) |
| 371 | { |
| 372 | struct backref_edge *edge; |
| 373 | struct backref_node *lower; |
| 374 | int idx = *index; |
| 375 | |
| 376 | while (idx > 0) { |
| 377 | edge = edges[idx - 1]; |
| 378 | lower = edge->node[LOWER]; |
| 379 | if (list_is_last(&edge->list[LOWER], &lower->upper)) { |
| 380 | idx--; |
| 381 | continue; |
| 382 | } |
| 383 | edge = list_entry(edge->list[LOWER].next, |
| 384 | struct backref_edge, list[LOWER]); |
| 385 | edges[idx - 1] = edge; |
| 386 | *index = idx; |
| 387 | return edge->node[UPPER]; |
| 388 | } |
| 389 | *index = 0; |
| 390 | return NULL; |
| 391 | } |
| 392 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 393 | static void unlock_node_buffer(struct backref_node *node) |
| 394 | { |
| 395 | if (node->locked) { |
| 396 | btrfs_tree_unlock(node->eb); |
| 397 | node->locked = 0; |
| 398 | } |
| 399 | } |
| 400 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 401 | static void drop_node_buffer(struct backref_node *node) |
| 402 | { |
| 403 | if (node->eb) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 404 | unlock_node_buffer(node); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 405 | free_extent_buffer(node->eb); |
| 406 | node->eb = NULL; |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | static void drop_backref_node(struct backref_cache *tree, |
| 411 | struct backref_node *node) |
| 412 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 413 | BUG_ON(!list_empty(&node->upper)); |
| 414 | |
| 415 | drop_node_buffer(node); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 416 | list_del(&node->list); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 417 | list_del(&node->lower); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 418 | if (!RB_EMPTY_NODE(&node->rb_node)) |
| 419 | rb_erase(&node->rb_node, &tree->rb_root); |
| 420 | free_backref_node(tree, node); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | /* |
| 424 | * remove a backref node from the backref cache |
| 425 | */ |
| 426 | static void remove_backref_node(struct backref_cache *cache, |
| 427 | struct backref_node *node) |
| 428 | { |
| 429 | struct backref_node *upper; |
| 430 | struct backref_edge *edge; |
| 431 | |
| 432 | if (!node) |
| 433 | return; |
| 434 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 435 | BUG_ON(!node->lowest && !node->detached); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 436 | while (!list_empty(&node->upper)) { |
| 437 | edge = list_entry(node->upper.next, struct backref_edge, |
| 438 | list[LOWER]); |
| 439 | upper = edge->node[UPPER]; |
| 440 | list_del(&edge->list[LOWER]); |
| 441 | list_del(&edge->list[UPPER]); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 442 | free_backref_edge(cache, edge); |
| 443 | |
| 444 | if (RB_EMPTY_NODE(&upper->rb_node)) { |
| 445 | BUG_ON(!list_empty(&node->upper)); |
| 446 | drop_backref_node(cache, node); |
| 447 | node = upper; |
| 448 | node->lowest = 1; |
| 449 | continue; |
| 450 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 451 | /* |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 452 | * add the node to leaf node list if no other |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 453 | * child block cached. |
| 454 | */ |
| 455 | if (list_empty(&upper->lower)) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 456 | list_add_tail(&upper->lower, &cache->leaves); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 457 | upper->lowest = 1; |
| 458 | } |
| 459 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 460 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 461 | drop_backref_node(cache, node); |
| 462 | } |
| 463 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 464 | static void update_backref_node(struct backref_cache *cache, |
| 465 | struct backref_node *node, u64 bytenr) |
| 466 | { |
| 467 | struct rb_node *rb_node; |
| 468 | rb_erase(&node->rb_node, &cache->rb_root); |
| 469 | node->bytenr = bytenr; |
| 470 | rb_node = tree_insert(&cache->rb_root, node->bytenr, &node->rb_node); |
Jeff Mahoney | 43c04fb | 2011-10-03 23:22:33 -0400 | [diff] [blame] | 471 | if (rb_node) |
| 472 | backref_tree_panic(rb_node, -EEXIST, bytenr); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | /* |
| 476 | * update backref cache after a transaction commit |
| 477 | */ |
| 478 | static int update_backref_cache(struct btrfs_trans_handle *trans, |
| 479 | struct backref_cache *cache) |
| 480 | { |
| 481 | struct backref_node *node; |
| 482 | int level = 0; |
| 483 | |
| 484 | if (cache->last_trans == 0) { |
| 485 | cache->last_trans = trans->transid; |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | if (cache->last_trans == trans->transid) |
| 490 | return 0; |
| 491 | |
| 492 | /* |
| 493 | * detached nodes are used to avoid unnecessary backref |
| 494 | * lookup. transaction commit changes the extent tree. |
| 495 | * so the detached nodes are no longer useful. |
| 496 | */ |
| 497 | while (!list_empty(&cache->detached)) { |
| 498 | node = list_entry(cache->detached.next, |
| 499 | struct backref_node, list); |
| 500 | remove_backref_node(cache, node); |
| 501 | } |
| 502 | |
| 503 | while (!list_empty(&cache->changed)) { |
| 504 | node = list_entry(cache->changed.next, |
| 505 | struct backref_node, list); |
| 506 | list_del_init(&node->list); |
| 507 | BUG_ON(node->pending); |
| 508 | update_backref_node(cache, node, node->new_bytenr); |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * some nodes can be left in the pending list if there were |
| 513 | * errors during processing the pending nodes. |
| 514 | */ |
| 515 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { |
| 516 | list_for_each_entry(node, &cache->pending[level], list) { |
| 517 | BUG_ON(!node->pending); |
| 518 | if (node->bytenr == node->new_bytenr) |
| 519 | continue; |
| 520 | update_backref_node(cache, node, node->new_bytenr); |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | cache->last_trans = 0; |
| 525 | return 1; |
| 526 | } |
| 527 | |
David Sterba | f2a97a9 | 2011-05-05 12:44:41 +0200 | [diff] [blame] | 528 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 529 | static int should_ignore_root(struct btrfs_root *root) |
| 530 | { |
| 531 | struct btrfs_root *reloc_root; |
| 532 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 533 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 534 | return 0; |
| 535 | |
| 536 | reloc_root = root->reloc_root; |
| 537 | if (!reloc_root) |
| 538 | return 0; |
| 539 | |
| 540 | if (btrfs_root_last_snapshot(&reloc_root->root_item) == |
| 541 | root->fs_info->running_transaction->transid - 1) |
| 542 | return 0; |
| 543 | /* |
| 544 | * if there is reloc tree and it was created in previous |
| 545 | * transaction backref lookup can find the reloc tree, |
| 546 | * so backref node for the fs tree root is useless for |
| 547 | * relocation. |
| 548 | */ |
| 549 | return 1; |
| 550 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 551 | /* |
| 552 | * find reloc tree by address of tree root |
| 553 | */ |
| 554 | static struct btrfs_root *find_reloc_root(struct reloc_control *rc, |
| 555 | u64 bytenr) |
| 556 | { |
| 557 | struct rb_node *rb_node; |
| 558 | struct mapping_node *node; |
| 559 | struct btrfs_root *root = NULL; |
| 560 | |
| 561 | spin_lock(&rc->reloc_root_tree.lock); |
| 562 | rb_node = tree_search(&rc->reloc_root_tree.rb_root, bytenr); |
| 563 | if (rb_node) { |
| 564 | node = rb_entry(rb_node, struct mapping_node, rb_node); |
| 565 | root = (struct btrfs_root *)node->data; |
| 566 | } |
| 567 | spin_unlock(&rc->reloc_root_tree.lock); |
| 568 | return root; |
| 569 | } |
| 570 | |
| 571 | static int is_cowonly_root(u64 root_objectid) |
| 572 | { |
| 573 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || |
| 574 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || |
| 575 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || |
| 576 | root_objectid == BTRFS_DEV_TREE_OBJECTID || |
| 577 | root_objectid == BTRFS_TREE_LOG_OBJECTID || |
Wang Shilong | 6646374 | 2013-12-10 00:14:34 +0800 | [diff] [blame] | 578 | root_objectid == BTRFS_CSUM_TREE_OBJECTID || |
| 579 | root_objectid == BTRFS_UUID_TREE_OBJECTID || |
David Sterba | 3e4c5ef | 2016-01-25 16:47:10 +0100 | [diff] [blame] | 580 | root_objectid == BTRFS_QUOTA_TREE_OBJECTID || |
| 581 | root_objectid == BTRFS_FREE_SPACE_TREE_OBJECTID) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 582 | return 1; |
| 583 | return 0; |
| 584 | } |
| 585 | |
| 586 | static struct btrfs_root *read_fs_root(struct btrfs_fs_info *fs_info, |
| 587 | u64 root_objectid) |
| 588 | { |
| 589 | struct btrfs_key key; |
| 590 | |
| 591 | key.objectid = root_objectid; |
| 592 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 593 | if (is_cowonly_root(root_objectid)) |
| 594 | key.offset = 0; |
| 595 | else |
| 596 | key.offset = (u64)-1; |
| 597 | |
Miao Xie | c00869f | 2013-09-25 21:47:44 +0800 | [diff] [blame] | 598 | return btrfs_get_fs_root(fs_info, &key, false); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 599 | } |
| 600 | |
| 601 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 602 | static noinline_for_stack |
| 603 | struct btrfs_root *find_tree_root(struct reloc_control *rc, |
| 604 | struct extent_buffer *leaf, |
| 605 | struct btrfs_extent_ref_v0 *ref0) |
| 606 | { |
| 607 | struct btrfs_root *root; |
| 608 | u64 root_objectid = btrfs_ref_root_v0(leaf, ref0); |
| 609 | u64 generation = btrfs_ref_generation_v0(leaf, ref0); |
| 610 | |
| 611 | BUG_ON(root_objectid == BTRFS_TREE_RELOC_OBJECTID); |
| 612 | |
| 613 | root = read_fs_root(rc->extent_root->fs_info, root_objectid); |
| 614 | BUG_ON(IS_ERR(root)); |
| 615 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 616 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) && |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 617 | generation != btrfs_root_generation(&root->root_item)) |
| 618 | return NULL; |
| 619 | |
| 620 | return root; |
| 621 | } |
| 622 | #endif |
| 623 | |
| 624 | static noinline_for_stack |
| 625 | int find_inline_backref(struct extent_buffer *leaf, int slot, |
| 626 | unsigned long *ptr, unsigned long *end) |
| 627 | { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 628 | struct btrfs_key key; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 629 | struct btrfs_extent_item *ei; |
| 630 | struct btrfs_tree_block_info *bi; |
| 631 | u32 item_size; |
| 632 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 633 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 634 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 635 | item_size = btrfs_item_size_nr(leaf, slot); |
| 636 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 637 | if (item_size < sizeof(*ei)) { |
| 638 | WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0)); |
| 639 | return 1; |
| 640 | } |
| 641 | #endif |
| 642 | ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); |
| 643 | WARN_ON(!(btrfs_extent_flags(leaf, ei) & |
| 644 | BTRFS_EXTENT_FLAG_TREE_BLOCK)); |
| 645 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 646 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
| 647 | item_size <= sizeof(*ei) + sizeof(*bi)) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 648 | WARN_ON(item_size < sizeof(*ei) + sizeof(*bi)); |
| 649 | return 1; |
| 650 | } |
Josef Bacik | d062d13 | 2013-07-30 15:44:09 -0400 | [diff] [blame] | 651 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
| 652 | item_size <= sizeof(*ei)) { |
| 653 | WARN_ON(item_size < sizeof(*ei)); |
| 654 | return 1; |
| 655 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 656 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 657 | if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
| 658 | bi = (struct btrfs_tree_block_info *)(ei + 1); |
| 659 | *ptr = (unsigned long)(bi + 1); |
| 660 | } else { |
| 661 | *ptr = (unsigned long)(ei + 1); |
| 662 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 663 | *end = (unsigned long)ei + item_size; |
| 664 | return 0; |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | * build backref tree for a given tree block. root of the backref tree |
| 669 | * corresponds the tree block, leaves of the backref tree correspond |
| 670 | * roots of b-trees that reference the tree block. |
| 671 | * |
| 672 | * the basic idea of this function is check backrefs of a given block |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 673 | * to find upper level blocks that reference the block, and then check |
| 674 | * backrefs of these upper level blocks recursively. the recursion stop |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 675 | * when tree root is reached or backrefs for the block is cached. |
| 676 | * |
| 677 | * NOTE: if we find backrefs for a block are cached, we know backrefs |
| 678 | * for all upper level blocks that directly/indirectly reference the |
| 679 | * block are also cached. |
| 680 | */ |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 681 | static noinline_for_stack |
| 682 | struct backref_node *build_backref_tree(struct reloc_control *rc, |
| 683 | struct btrfs_key *node_key, |
| 684 | int level, u64 bytenr) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 685 | { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 686 | struct backref_cache *cache = &rc->backref_cache; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 687 | struct btrfs_path *path1; |
| 688 | struct btrfs_path *path2; |
| 689 | struct extent_buffer *eb; |
| 690 | struct btrfs_root *root; |
| 691 | struct backref_node *cur; |
| 692 | struct backref_node *upper; |
| 693 | struct backref_node *lower; |
| 694 | struct backref_node *node = NULL; |
| 695 | struct backref_node *exist = NULL; |
| 696 | struct backref_edge *edge; |
| 697 | struct rb_node *rb_node; |
| 698 | struct btrfs_key key; |
| 699 | unsigned long end; |
| 700 | unsigned long ptr; |
| 701 | LIST_HEAD(list); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 702 | LIST_HEAD(useless); |
| 703 | int cowonly; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 704 | int ret; |
| 705 | int err = 0; |
Josef Bacik | b6c60c8 | 2013-07-30 16:30:30 -0400 | [diff] [blame] | 706 | bool need_check = true; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 707 | |
| 708 | path1 = btrfs_alloc_path(); |
| 709 | path2 = btrfs_alloc_path(); |
| 710 | if (!path1 || !path2) { |
| 711 | err = -ENOMEM; |
| 712 | goto out; |
| 713 | } |
David Sterba | e4058b5 | 2015-11-27 16:31:35 +0100 | [diff] [blame] | 714 | path1->reada = READA_FORWARD; |
| 715 | path2->reada = READA_FORWARD; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 716 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 717 | node = alloc_backref_node(cache); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 718 | if (!node) { |
| 719 | err = -ENOMEM; |
| 720 | goto out; |
| 721 | } |
| 722 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 723 | node->bytenr = bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 724 | node->level = level; |
| 725 | node->lowest = 1; |
| 726 | cur = node; |
| 727 | again: |
| 728 | end = 0; |
| 729 | ptr = 0; |
| 730 | key.objectid = cur->bytenr; |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 731 | key.type = BTRFS_METADATA_ITEM_KEY; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 732 | key.offset = (u64)-1; |
| 733 | |
| 734 | path1->search_commit_root = 1; |
| 735 | path1->skip_locking = 1; |
| 736 | ret = btrfs_search_slot(NULL, rc->extent_root, &key, path1, |
| 737 | 0, 0); |
| 738 | if (ret < 0) { |
| 739 | err = ret; |
| 740 | goto out; |
| 741 | } |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 742 | ASSERT(ret); |
| 743 | ASSERT(path1->slots[0]); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 744 | |
| 745 | path1->slots[0]--; |
| 746 | |
| 747 | WARN_ON(cur->checked); |
| 748 | if (!list_empty(&cur->upper)) { |
| 749 | /* |
Justin P. Mattock | 70f23fd | 2011-05-10 10:16:21 +0200 | [diff] [blame] | 750 | * the backref was added previously when processing |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 751 | * backref of type BTRFS_TREE_BLOCK_REF_KEY |
| 752 | */ |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 753 | ASSERT(list_is_singular(&cur->upper)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 754 | edge = list_entry(cur->upper.next, struct backref_edge, |
| 755 | list[LOWER]); |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 756 | ASSERT(list_empty(&edge->list[UPPER])); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 757 | exist = edge->node[UPPER]; |
| 758 | /* |
| 759 | * add the upper level block to pending list if we need |
| 760 | * check its backrefs |
| 761 | */ |
| 762 | if (!exist->checked) |
| 763 | list_add_tail(&edge->list[UPPER], &list); |
| 764 | } else { |
| 765 | exist = NULL; |
| 766 | } |
| 767 | |
| 768 | while (1) { |
| 769 | cond_resched(); |
| 770 | eb = path1->nodes[0]; |
| 771 | |
| 772 | if (ptr >= end) { |
| 773 | if (path1->slots[0] >= btrfs_header_nritems(eb)) { |
| 774 | ret = btrfs_next_leaf(rc->extent_root, path1); |
| 775 | if (ret < 0) { |
| 776 | err = ret; |
| 777 | goto out; |
| 778 | } |
| 779 | if (ret > 0) |
| 780 | break; |
| 781 | eb = path1->nodes[0]; |
| 782 | } |
| 783 | |
| 784 | btrfs_item_key_to_cpu(eb, &key, path1->slots[0]); |
| 785 | if (key.objectid != cur->bytenr) { |
| 786 | WARN_ON(exist); |
| 787 | break; |
| 788 | } |
| 789 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 790 | if (key.type == BTRFS_EXTENT_ITEM_KEY || |
| 791 | key.type == BTRFS_METADATA_ITEM_KEY) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 792 | ret = find_inline_backref(eb, path1->slots[0], |
| 793 | &ptr, &end); |
| 794 | if (ret) |
| 795 | goto next; |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | if (ptr < end) { |
| 800 | /* update key for inline back ref */ |
| 801 | struct btrfs_extent_inline_ref *iref; |
| 802 | iref = (struct btrfs_extent_inline_ref *)ptr; |
| 803 | key.type = btrfs_extent_inline_ref_type(eb, iref); |
| 804 | key.offset = btrfs_extent_inline_ref_offset(eb, iref); |
| 805 | WARN_ON(key.type != BTRFS_TREE_BLOCK_REF_KEY && |
| 806 | key.type != BTRFS_SHARED_BLOCK_REF_KEY); |
| 807 | } |
| 808 | |
| 809 | if (exist && |
| 810 | ((key.type == BTRFS_TREE_BLOCK_REF_KEY && |
| 811 | exist->owner == key.offset) || |
| 812 | (key.type == BTRFS_SHARED_BLOCK_REF_KEY && |
| 813 | exist->bytenr == key.offset))) { |
| 814 | exist = NULL; |
| 815 | goto next; |
| 816 | } |
| 817 | |
| 818 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 819 | if (key.type == BTRFS_SHARED_BLOCK_REF_KEY || |
| 820 | key.type == BTRFS_EXTENT_REF_V0_KEY) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 821 | if (key.type == BTRFS_EXTENT_REF_V0_KEY) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 822 | struct btrfs_extent_ref_v0 *ref0; |
| 823 | ref0 = btrfs_item_ptr(eb, path1->slots[0], |
| 824 | struct btrfs_extent_ref_v0); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 825 | if (key.objectid == key.offset) { |
Yan, Zheng | 046f264 | 2010-05-31 08:58:47 +0000 | [diff] [blame] | 826 | root = find_tree_root(rc, eb, ref0); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 827 | if (root && !should_ignore_root(root)) |
| 828 | cur->root = root; |
| 829 | else |
| 830 | list_add(&cur->list, &useless); |
| 831 | break; |
| 832 | } |
Yan, Zheng | 046f264 | 2010-05-31 08:58:47 +0000 | [diff] [blame] | 833 | if (is_cowonly_root(btrfs_ref_root_v0(eb, |
| 834 | ref0))) |
| 835 | cur->cowonly = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 836 | } |
| 837 | #else |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 838 | ASSERT(key.type != BTRFS_EXTENT_REF_V0_KEY); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 839 | if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) { |
| 840 | #endif |
| 841 | if (key.objectid == key.offset) { |
| 842 | /* |
| 843 | * only root blocks of reloc trees use |
| 844 | * backref of this type. |
| 845 | */ |
| 846 | root = find_reloc_root(rc, cur->bytenr); |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 847 | ASSERT(root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 848 | cur->root = root; |
| 849 | break; |
| 850 | } |
| 851 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 852 | edge = alloc_backref_edge(cache); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 853 | if (!edge) { |
| 854 | err = -ENOMEM; |
| 855 | goto out; |
| 856 | } |
| 857 | rb_node = tree_search(&cache->rb_root, key.offset); |
| 858 | if (!rb_node) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 859 | upper = alloc_backref_node(cache); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 860 | if (!upper) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 861 | free_backref_edge(cache, edge); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 862 | err = -ENOMEM; |
| 863 | goto out; |
| 864 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 865 | upper->bytenr = key.offset; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 866 | upper->level = cur->level + 1; |
| 867 | /* |
| 868 | * backrefs for the upper level block isn't |
| 869 | * cached, add the block to pending list |
| 870 | */ |
| 871 | list_add_tail(&edge->list[UPPER], &list); |
| 872 | } else { |
| 873 | upper = rb_entry(rb_node, struct backref_node, |
| 874 | rb_node); |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 875 | ASSERT(upper->checked); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 876 | INIT_LIST_HEAD(&edge->list[UPPER]); |
| 877 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 878 | list_add_tail(&edge->list[LOWER], &cur->upper); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 879 | edge->node[LOWER] = cur; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 880 | edge->node[UPPER] = upper; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 881 | |
| 882 | goto next; |
| 883 | } else if (key.type != BTRFS_TREE_BLOCK_REF_KEY) { |
| 884 | goto next; |
| 885 | } |
| 886 | |
| 887 | /* key.type == BTRFS_TREE_BLOCK_REF_KEY */ |
| 888 | root = read_fs_root(rc->extent_root->fs_info, key.offset); |
| 889 | if (IS_ERR(root)) { |
| 890 | err = PTR_ERR(root); |
| 891 | goto out; |
| 892 | } |
| 893 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 894 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 895 | cur->cowonly = 1; |
| 896 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 897 | if (btrfs_root_level(&root->root_item) == cur->level) { |
| 898 | /* tree root */ |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 899 | ASSERT(btrfs_root_bytenr(&root->root_item) == |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 900 | cur->bytenr); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 901 | if (should_ignore_root(root)) |
| 902 | list_add(&cur->list, &useless); |
| 903 | else |
| 904 | cur->root = root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 905 | break; |
| 906 | } |
| 907 | |
| 908 | level = cur->level + 1; |
| 909 | |
| 910 | /* |
| 911 | * searching the tree to find upper level blocks |
| 912 | * reference the block. |
| 913 | */ |
| 914 | path2->search_commit_root = 1; |
| 915 | path2->skip_locking = 1; |
| 916 | path2->lowest_level = level; |
| 917 | ret = btrfs_search_slot(NULL, root, node_key, path2, 0, 0); |
| 918 | path2->lowest_level = 0; |
| 919 | if (ret < 0) { |
| 920 | err = ret; |
| 921 | goto out; |
| 922 | } |
Yan Zheng | 33c66f4 | 2009-07-22 09:59:00 -0400 | [diff] [blame] | 923 | if (ret > 0 && path2->slots[level] > 0) |
| 924 | path2->slots[level]--; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 925 | |
| 926 | eb = path2->nodes[level]; |
Liu Bo | 3561b9d | 2016-09-14 08:51:46 -0700 | [diff] [blame] | 927 | if (btrfs_node_blockptr(eb, path2->slots[level]) != |
| 928 | cur->bytenr) { |
| 929 | btrfs_err(root->fs_info, |
| 930 | "couldn't find block (%llu) (level %d) in tree (%llu) with key (%llu %u %llu)", |
| 931 | cur->bytenr, level - 1, root->objectid, |
| 932 | node_key->objectid, node_key->type, |
| 933 | node_key->offset); |
| 934 | err = -ENOENT; |
| 935 | goto out; |
| 936 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 937 | lower = cur; |
Josef Bacik | b6c60c8 | 2013-07-30 16:30:30 -0400 | [diff] [blame] | 938 | need_check = true; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 939 | for (; level < BTRFS_MAX_LEVEL; level++) { |
| 940 | if (!path2->nodes[level]) { |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 941 | ASSERT(btrfs_root_bytenr(&root->root_item) == |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 942 | lower->bytenr); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 943 | if (should_ignore_root(root)) |
| 944 | list_add(&lower->list, &useless); |
| 945 | else |
| 946 | lower->root = root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 947 | break; |
| 948 | } |
| 949 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 950 | edge = alloc_backref_edge(cache); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 951 | if (!edge) { |
| 952 | err = -ENOMEM; |
| 953 | goto out; |
| 954 | } |
| 955 | |
| 956 | eb = path2->nodes[level]; |
| 957 | rb_node = tree_search(&cache->rb_root, eb->start); |
| 958 | if (!rb_node) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 959 | upper = alloc_backref_node(cache); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 960 | if (!upper) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 961 | free_backref_edge(cache, edge); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 962 | err = -ENOMEM; |
| 963 | goto out; |
| 964 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 965 | upper->bytenr = eb->start; |
| 966 | upper->owner = btrfs_header_owner(eb); |
| 967 | upper->level = lower->level + 1; |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 968 | if (!test_bit(BTRFS_ROOT_REF_COWS, |
| 969 | &root->state)) |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 970 | upper->cowonly = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 971 | |
| 972 | /* |
| 973 | * if we know the block isn't shared |
| 974 | * we can void checking its backrefs. |
| 975 | */ |
| 976 | if (btrfs_block_can_be_shared(root, eb)) |
| 977 | upper->checked = 0; |
| 978 | else |
| 979 | upper->checked = 1; |
| 980 | |
| 981 | /* |
| 982 | * add the block to pending list if we |
Josef Bacik | b6c60c8 | 2013-07-30 16:30:30 -0400 | [diff] [blame] | 983 | * need check its backrefs, we only do this once |
| 984 | * while walking up a tree as we will catch |
| 985 | * anything else later on. |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 986 | */ |
Josef Bacik | b6c60c8 | 2013-07-30 16:30:30 -0400 | [diff] [blame] | 987 | if (!upper->checked && need_check) { |
| 988 | need_check = false; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 989 | list_add_tail(&edge->list[UPPER], |
| 990 | &list); |
Josef Bacik | bbe9051 | 2014-09-19 15:43:34 -0400 | [diff] [blame] | 991 | } else { |
| 992 | if (upper->checked) |
| 993 | need_check = true; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 994 | INIT_LIST_HEAD(&edge->list[UPPER]); |
Josef Bacik | bbe9051 | 2014-09-19 15:43:34 -0400 | [diff] [blame] | 995 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 996 | } else { |
| 997 | upper = rb_entry(rb_node, struct backref_node, |
| 998 | rb_node); |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 999 | ASSERT(upper->checked); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1000 | INIT_LIST_HEAD(&edge->list[UPPER]); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1001 | if (!upper->owner) |
| 1002 | upper->owner = btrfs_header_owner(eb); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1003 | } |
| 1004 | list_add_tail(&edge->list[LOWER], &lower->upper); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1005 | edge->node[LOWER] = lower; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1006 | edge->node[UPPER] = upper; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1007 | |
| 1008 | if (rb_node) |
| 1009 | break; |
| 1010 | lower = upper; |
| 1011 | upper = NULL; |
| 1012 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1013 | btrfs_release_path(path2); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1014 | next: |
| 1015 | if (ptr < end) { |
| 1016 | ptr += btrfs_extent_inline_ref_size(key.type); |
| 1017 | if (ptr >= end) { |
| 1018 | WARN_ON(ptr > end); |
| 1019 | ptr = 0; |
| 1020 | end = 0; |
| 1021 | } |
| 1022 | } |
| 1023 | if (ptr >= end) |
| 1024 | path1->slots[0]++; |
| 1025 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1026 | btrfs_release_path(path1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1027 | |
| 1028 | cur->checked = 1; |
| 1029 | WARN_ON(exist); |
| 1030 | |
| 1031 | /* the pending list isn't empty, take the first block to process */ |
| 1032 | if (!list_empty(&list)) { |
| 1033 | edge = list_entry(list.next, struct backref_edge, list[UPPER]); |
| 1034 | list_del_init(&edge->list[UPPER]); |
| 1035 | cur = edge->node[UPPER]; |
| 1036 | goto again; |
| 1037 | } |
| 1038 | |
| 1039 | /* |
| 1040 | * everything goes well, connect backref nodes and insert backref nodes |
| 1041 | * into the cache. |
| 1042 | */ |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 1043 | ASSERT(node->checked); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1044 | cowonly = node->cowonly; |
| 1045 | if (!cowonly) { |
| 1046 | rb_node = tree_insert(&cache->rb_root, node->bytenr, |
| 1047 | &node->rb_node); |
Jeff Mahoney | 43c04fb | 2011-10-03 23:22:33 -0400 | [diff] [blame] | 1048 | if (rb_node) |
| 1049 | backref_tree_panic(rb_node, -EEXIST, node->bytenr); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1050 | list_add_tail(&node->lower, &cache->leaves); |
| 1051 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1052 | |
| 1053 | list_for_each_entry(edge, &node->upper, list[LOWER]) |
| 1054 | list_add_tail(&edge->list[UPPER], &list); |
| 1055 | |
| 1056 | while (!list_empty(&list)) { |
| 1057 | edge = list_entry(list.next, struct backref_edge, list[UPPER]); |
| 1058 | list_del_init(&edge->list[UPPER]); |
| 1059 | upper = edge->node[UPPER]; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1060 | if (upper->detached) { |
| 1061 | list_del(&edge->list[LOWER]); |
| 1062 | lower = edge->node[LOWER]; |
| 1063 | free_backref_edge(cache, edge); |
| 1064 | if (list_empty(&lower->upper)) |
| 1065 | list_add(&lower->list, &useless); |
| 1066 | continue; |
| 1067 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1068 | |
| 1069 | if (!RB_EMPTY_NODE(&upper->rb_node)) { |
| 1070 | if (upper->lowest) { |
| 1071 | list_del_init(&upper->lower); |
| 1072 | upper->lowest = 0; |
| 1073 | } |
| 1074 | |
| 1075 | list_add_tail(&edge->list[UPPER], &upper->lower); |
| 1076 | continue; |
| 1077 | } |
| 1078 | |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 1079 | if (!upper->checked) { |
| 1080 | /* |
| 1081 | * Still want to blow up for developers since this is a |
| 1082 | * logic bug. |
| 1083 | */ |
| 1084 | ASSERT(0); |
| 1085 | err = -EINVAL; |
| 1086 | goto out; |
| 1087 | } |
| 1088 | if (cowonly != upper->cowonly) { |
| 1089 | ASSERT(0); |
| 1090 | err = -EINVAL; |
| 1091 | goto out; |
| 1092 | } |
| 1093 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1094 | if (!cowonly) { |
| 1095 | rb_node = tree_insert(&cache->rb_root, upper->bytenr, |
| 1096 | &upper->rb_node); |
Jeff Mahoney | 43c04fb | 2011-10-03 23:22:33 -0400 | [diff] [blame] | 1097 | if (rb_node) |
| 1098 | backref_tree_panic(rb_node, -EEXIST, |
| 1099 | upper->bytenr); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1100 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1101 | |
| 1102 | list_add_tail(&edge->list[UPPER], &upper->lower); |
| 1103 | |
| 1104 | list_for_each_entry(edge, &upper->upper, list[LOWER]) |
| 1105 | list_add_tail(&edge->list[UPPER], &list); |
| 1106 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1107 | /* |
| 1108 | * process useless backref nodes. backref nodes for tree leaves |
| 1109 | * are deleted from the cache. backref nodes for upper level |
| 1110 | * tree blocks are left in the cache to avoid unnecessary backref |
| 1111 | * lookup. |
| 1112 | */ |
| 1113 | while (!list_empty(&useless)) { |
| 1114 | upper = list_entry(useless.next, struct backref_node, list); |
| 1115 | list_del_init(&upper->list); |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 1116 | ASSERT(list_empty(&upper->upper)); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1117 | if (upper == node) |
| 1118 | node = NULL; |
| 1119 | if (upper->lowest) { |
| 1120 | list_del_init(&upper->lower); |
| 1121 | upper->lowest = 0; |
| 1122 | } |
| 1123 | while (!list_empty(&upper->lower)) { |
| 1124 | edge = list_entry(upper->lower.next, |
| 1125 | struct backref_edge, list[UPPER]); |
| 1126 | list_del(&edge->list[UPPER]); |
| 1127 | list_del(&edge->list[LOWER]); |
| 1128 | lower = edge->node[LOWER]; |
| 1129 | free_backref_edge(cache, edge); |
| 1130 | |
| 1131 | if (list_empty(&lower->upper)) |
| 1132 | list_add(&lower->list, &useless); |
| 1133 | } |
| 1134 | __mark_block_processed(rc, upper); |
| 1135 | if (upper->level > 0) { |
| 1136 | list_add(&upper->list, &cache->detached); |
| 1137 | upper->detached = 1; |
| 1138 | } else { |
| 1139 | rb_erase(&upper->rb_node, &cache->rb_root); |
| 1140 | free_backref_node(cache, upper); |
| 1141 | } |
| 1142 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1143 | out: |
| 1144 | btrfs_free_path(path1); |
| 1145 | btrfs_free_path(path2); |
| 1146 | if (err) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1147 | while (!list_empty(&useless)) { |
| 1148 | lower = list_entry(useless.next, |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 1149 | struct backref_node, list); |
| 1150 | list_del_init(&lower->list); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1151 | } |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 1152 | while (!list_empty(&list)) { |
| 1153 | edge = list_first_entry(&list, struct backref_edge, |
| 1154 | list[UPPER]); |
| 1155 | list_del(&edge->list[UPPER]); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1156 | list_del(&edge->list[LOWER]); |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 1157 | lower = edge->node[LOWER]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1158 | upper = edge->node[UPPER]; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1159 | free_backref_edge(cache, edge); |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 1160 | |
| 1161 | /* |
| 1162 | * Lower is no longer linked to any upper backref nodes |
| 1163 | * and isn't in the cache, we can free it ourselves. |
| 1164 | */ |
| 1165 | if (list_empty(&lower->upper) && |
| 1166 | RB_EMPTY_NODE(&lower->rb_node)) |
| 1167 | list_add(&lower->list, &useless); |
| 1168 | |
| 1169 | if (!RB_EMPTY_NODE(&upper->rb_node)) |
| 1170 | continue; |
| 1171 | |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 1172 | /* Add this guy's upper edges to the list to process */ |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 1173 | list_for_each_entry(edge, &upper->upper, list[LOWER]) |
| 1174 | list_add_tail(&edge->list[UPPER], &list); |
| 1175 | if (list_empty(&upper->upper)) |
| 1176 | list_add(&upper->list, &useless); |
| 1177 | } |
| 1178 | |
| 1179 | while (!list_empty(&useless)) { |
| 1180 | lower = list_entry(useless.next, |
| 1181 | struct backref_node, list); |
| 1182 | list_del_init(&lower->list); |
Liu Bo | 0fd8c3d | 2016-07-12 10:29:37 -0700 | [diff] [blame] | 1183 | if (lower == node) |
| 1184 | node = NULL; |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 1185 | free_backref_node(cache, lower); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1186 | } |
Liu Bo | 0fd8c3d | 2016-07-12 10:29:37 -0700 | [diff] [blame] | 1187 | |
| 1188 | free_backref_node(cache, node); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1189 | return ERR_PTR(err); |
| 1190 | } |
Josef Bacik | 75bfb9a | 2014-09-19 10:40:00 -0400 | [diff] [blame] | 1191 | ASSERT(!node || !node->detached); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1192 | return node; |
| 1193 | } |
| 1194 | |
| 1195 | /* |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1196 | * helper to add backref node for the newly created snapshot. |
| 1197 | * the backref node is created by cloning backref node that |
| 1198 | * corresponds to root of source tree |
| 1199 | */ |
| 1200 | static int clone_backref_node(struct btrfs_trans_handle *trans, |
| 1201 | struct reloc_control *rc, |
| 1202 | struct btrfs_root *src, |
| 1203 | struct btrfs_root *dest) |
| 1204 | { |
| 1205 | struct btrfs_root *reloc_root = src->reloc_root; |
| 1206 | struct backref_cache *cache = &rc->backref_cache; |
| 1207 | struct backref_node *node = NULL; |
| 1208 | struct backref_node *new_node; |
| 1209 | struct backref_edge *edge; |
| 1210 | struct backref_edge *new_edge; |
| 1211 | struct rb_node *rb_node; |
| 1212 | |
| 1213 | if (cache->last_trans > 0) |
| 1214 | update_backref_cache(trans, cache); |
| 1215 | |
| 1216 | rb_node = tree_search(&cache->rb_root, src->commit_root->start); |
| 1217 | if (rb_node) { |
| 1218 | node = rb_entry(rb_node, struct backref_node, rb_node); |
| 1219 | if (node->detached) |
| 1220 | node = NULL; |
| 1221 | else |
| 1222 | BUG_ON(node->new_bytenr != reloc_root->node->start); |
| 1223 | } |
| 1224 | |
| 1225 | if (!node) { |
| 1226 | rb_node = tree_search(&cache->rb_root, |
| 1227 | reloc_root->commit_root->start); |
| 1228 | if (rb_node) { |
| 1229 | node = rb_entry(rb_node, struct backref_node, |
| 1230 | rb_node); |
| 1231 | BUG_ON(node->detached); |
| 1232 | } |
| 1233 | } |
| 1234 | |
| 1235 | if (!node) |
| 1236 | return 0; |
| 1237 | |
| 1238 | new_node = alloc_backref_node(cache); |
| 1239 | if (!new_node) |
| 1240 | return -ENOMEM; |
| 1241 | |
| 1242 | new_node->bytenr = dest->node->start; |
| 1243 | new_node->level = node->level; |
| 1244 | new_node->lowest = node->lowest; |
Yan, Zheng | 6848ad6 | 2011-02-14 16:00:03 -0500 | [diff] [blame] | 1245 | new_node->checked = 1; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1246 | new_node->root = dest; |
| 1247 | |
| 1248 | if (!node->lowest) { |
| 1249 | list_for_each_entry(edge, &node->lower, list[UPPER]) { |
| 1250 | new_edge = alloc_backref_edge(cache); |
| 1251 | if (!new_edge) |
| 1252 | goto fail; |
| 1253 | |
| 1254 | new_edge->node[UPPER] = new_node; |
| 1255 | new_edge->node[LOWER] = edge->node[LOWER]; |
| 1256 | list_add_tail(&new_edge->list[UPPER], |
| 1257 | &new_node->lower); |
| 1258 | } |
Miao Xie | 76b9e23 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 1259 | } else { |
| 1260 | list_add_tail(&new_node->lower, &cache->leaves); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1261 | } |
| 1262 | |
| 1263 | rb_node = tree_insert(&cache->rb_root, new_node->bytenr, |
| 1264 | &new_node->rb_node); |
Jeff Mahoney | 43c04fb | 2011-10-03 23:22:33 -0400 | [diff] [blame] | 1265 | if (rb_node) |
| 1266 | backref_tree_panic(rb_node, -EEXIST, new_node->bytenr); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1267 | |
| 1268 | if (!new_node->lowest) { |
| 1269 | list_for_each_entry(new_edge, &new_node->lower, list[UPPER]) { |
| 1270 | list_add_tail(&new_edge->list[LOWER], |
| 1271 | &new_edge->node[LOWER]->upper); |
| 1272 | } |
| 1273 | } |
| 1274 | return 0; |
| 1275 | fail: |
| 1276 | while (!list_empty(&new_node->lower)) { |
| 1277 | new_edge = list_entry(new_node->lower.next, |
| 1278 | struct backref_edge, list[UPPER]); |
| 1279 | list_del(&new_edge->list[UPPER]); |
| 1280 | free_backref_edge(cache, new_edge); |
| 1281 | } |
| 1282 | free_backref_node(cache, new_node); |
| 1283 | return -ENOMEM; |
| 1284 | } |
| 1285 | |
| 1286 | /* |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1287 | * helper to add 'address of tree root -> reloc tree' mapping |
| 1288 | */ |
Jeff Mahoney | ffd7b33 | 2011-10-03 23:23:15 -0400 | [diff] [blame] | 1289 | static int __must_check __add_reloc_root(struct btrfs_root *root) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1290 | { |
| 1291 | struct rb_node *rb_node; |
| 1292 | struct mapping_node *node; |
| 1293 | struct reloc_control *rc = root->fs_info->reloc_ctl; |
| 1294 | |
| 1295 | node = kmalloc(sizeof(*node), GFP_NOFS); |
Jeff Mahoney | ffd7b33 | 2011-10-03 23:23:15 -0400 | [diff] [blame] | 1296 | if (!node) |
| 1297 | return -ENOMEM; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1298 | |
| 1299 | node->bytenr = root->node->start; |
| 1300 | node->data = root; |
| 1301 | |
| 1302 | spin_lock(&rc->reloc_root_tree.lock); |
| 1303 | rb_node = tree_insert(&rc->reloc_root_tree.rb_root, |
| 1304 | node->bytenr, &node->rb_node); |
| 1305 | spin_unlock(&rc->reloc_root_tree.lock); |
Jeff Mahoney | ffd7b33 | 2011-10-03 23:23:15 -0400 | [diff] [blame] | 1306 | if (rb_node) { |
Jeff Mahoney | 5d163e0 | 2016-09-20 10:05:00 -0400 | [diff] [blame] | 1307 | btrfs_panic(root->fs_info, -EEXIST, |
| 1308 | "Duplicate root found for start=%llu while inserting into relocation tree", |
| 1309 | node->bytenr); |
Dan Carpenter | 23291a0 | 2012-06-25 05:15:23 -0600 | [diff] [blame] | 1310 | kfree(node); |
| 1311 | return -EEXIST; |
Jeff Mahoney | ffd7b33 | 2011-10-03 23:23:15 -0400 | [diff] [blame] | 1312 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1313 | |
| 1314 | list_add_tail(&root->root_list, &rc->reloc_roots); |
| 1315 | return 0; |
| 1316 | } |
| 1317 | |
| 1318 | /* |
Wang Shilong | c974c46 | 2013-12-11 19:29:51 +0800 | [diff] [blame] | 1319 | * helper to delete the 'address of tree root -> reloc tree' |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1320 | * mapping |
| 1321 | */ |
Wang Shilong | c974c46 | 2013-12-11 19:29:51 +0800 | [diff] [blame] | 1322 | static void __del_reloc_root(struct btrfs_root *root) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1323 | { |
| 1324 | struct rb_node *rb_node; |
| 1325 | struct mapping_node *node = NULL; |
| 1326 | struct reloc_control *rc = root->fs_info->reloc_ctl; |
| 1327 | |
| 1328 | spin_lock(&rc->reloc_root_tree.lock); |
| 1329 | rb_node = tree_search(&rc->reloc_root_tree.rb_root, |
Wang Shilong | c974c46 | 2013-12-11 19:29:51 +0800 | [diff] [blame] | 1330 | root->node->start); |
| 1331 | if (rb_node) { |
| 1332 | node = rb_entry(rb_node, struct mapping_node, rb_node); |
| 1333 | rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); |
| 1334 | } |
| 1335 | spin_unlock(&rc->reloc_root_tree.lock); |
| 1336 | |
| 1337 | if (!node) |
| 1338 | return; |
| 1339 | BUG_ON((struct btrfs_root *)node->data != root); |
| 1340 | |
| 1341 | spin_lock(&root->fs_info->trans_lock); |
| 1342 | list_del_init(&root->root_list); |
| 1343 | spin_unlock(&root->fs_info->trans_lock); |
| 1344 | kfree(node); |
| 1345 | } |
| 1346 | |
| 1347 | /* |
| 1348 | * helper to update the 'address of tree root -> reloc tree' |
| 1349 | * mapping |
| 1350 | */ |
| 1351 | static int __update_reloc_root(struct btrfs_root *root, u64 new_bytenr) |
| 1352 | { |
| 1353 | struct rb_node *rb_node; |
| 1354 | struct mapping_node *node = NULL; |
| 1355 | struct reloc_control *rc = root->fs_info->reloc_ctl; |
| 1356 | |
| 1357 | spin_lock(&rc->reloc_root_tree.lock); |
| 1358 | rb_node = tree_search(&rc->reloc_root_tree.rb_root, |
| 1359 | root->node->start); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1360 | if (rb_node) { |
| 1361 | node = rb_entry(rb_node, struct mapping_node, rb_node); |
| 1362 | rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root); |
| 1363 | } |
| 1364 | spin_unlock(&rc->reloc_root_tree.lock); |
| 1365 | |
Liu Bo | 8f71f3e | 2013-03-04 16:25:36 +0000 | [diff] [blame] | 1366 | if (!node) |
| 1367 | return 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1368 | BUG_ON((struct btrfs_root *)node->data != root); |
| 1369 | |
Wang Shilong | c974c46 | 2013-12-11 19:29:51 +0800 | [diff] [blame] | 1370 | spin_lock(&rc->reloc_root_tree.lock); |
| 1371 | node->bytenr = new_bytenr; |
| 1372 | rb_node = tree_insert(&rc->reloc_root_tree.rb_root, |
| 1373 | node->bytenr, &node->rb_node); |
| 1374 | spin_unlock(&rc->reloc_root_tree.lock); |
| 1375 | if (rb_node) |
| 1376 | backref_tree_panic(rb_node, -EEXIST, node->bytenr); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1377 | return 0; |
| 1378 | } |
| 1379 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1380 | static struct btrfs_root *create_reloc_root(struct btrfs_trans_handle *trans, |
| 1381 | struct btrfs_root *root, u64 objectid) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1382 | { |
| 1383 | struct btrfs_root *reloc_root; |
| 1384 | struct extent_buffer *eb; |
| 1385 | struct btrfs_root_item *root_item; |
| 1386 | struct btrfs_key root_key; |
Miao Xie | 5bc7247 | 2013-06-06 03:28:03 +0000 | [diff] [blame] | 1387 | u64 last_snap = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1388 | int ret; |
| 1389 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1390 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); |
| 1391 | BUG_ON(!root_item); |
| 1392 | |
| 1393 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; |
| 1394 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1395 | root_key.offset = objectid; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1396 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1397 | if (root->root_key.objectid == objectid) { |
Filipe Manana | 01f285f | 2016-11-01 11:23:31 +0000 | [diff] [blame] | 1398 | u64 commit_root_gen; |
| 1399 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1400 | /* called by btrfs_init_reloc_root */ |
| 1401 | ret = btrfs_copy_root(trans, root, root->commit_root, &eb, |
| 1402 | BTRFS_TREE_RELOC_OBJECTID); |
| 1403 | BUG_ON(ret); |
Miao Xie | 5bc7247 | 2013-06-06 03:28:03 +0000 | [diff] [blame] | 1404 | last_snap = btrfs_root_last_snapshot(&root->root_item); |
Filipe Manana | 01f285f | 2016-11-01 11:23:31 +0000 | [diff] [blame] | 1405 | /* |
| 1406 | * Set the last_snapshot field to the generation of the commit |
| 1407 | * root - like this ctree.c:btrfs_block_can_be_shared() behaves |
| 1408 | * correctly (returns true) when the relocation root is created |
| 1409 | * either inside the critical section of a transaction commit |
| 1410 | * (through transaction.c:qgroup_account_snapshot()) and when |
| 1411 | * it's created before the transaction commit is started. |
| 1412 | */ |
| 1413 | commit_root_gen = btrfs_header_generation(root->commit_root); |
| 1414 | btrfs_set_root_last_snapshot(&root->root_item, commit_root_gen); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1415 | } else { |
| 1416 | /* |
| 1417 | * called by btrfs_reloc_post_snapshot_hook. |
| 1418 | * the source tree is a reloc tree, all tree blocks |
| 1419 | * modified after it was created have RELOC flag |
| 1420 | * set in their headers. so it's OK to not update |
| 1421 | * the 'last_snapshot'. |
| 1422 | */ |
| 1423 | ret = btrfs_copy_root(trans, root, root->node, &eb, |
| 1424 | BTRFS_TREE_RELOC_OBJECTID); |
| 1425 | BUG_ON(ret); |
| 1426 | } |
| 1427 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1428 | memcpy(root_item, &root->root_item, sizeof(*root_item)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1429 | btrfs_set_root_bytenr(root_item, eb->start); |
| 1430 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); |
| 1431 | btrfs_set_root_generation(root_item, trans->transid); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1432 | |
| 1433 | if (root->root_key.objectid == objectid) { |
| 1434 | btrfs_set_root_refs(root_item, 0); |
| 1435 | memset(&root_item->drop_progress, 0, |
| 1436 | sizeof(struct btrfs_disk_key)); |
| 1437 | root_item->drop_level = 0; |
Miao Xie | 5bc7247 | 2013-06-06 03:28:03 +0000 | [diff] [blame] | 1438 | /* |
| 1439 | * abuse rtransid, it is safe because it is impossible to |
| 1440 | * receive data into a relocation tree. |
| 1441 | */ |
| 1442 | btrfs_set_root_rtransid(root_item, last_snap); |
| 1443 | btrfs_set_root_otransid(root_item, trans->transid); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1444 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1445 | |
| 1446 | btrfs_tree_unlock(eb); |
| 1447 | free_extent_buffer(eb); |
| 1448 | |
| 1449 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, |
| 1450 | &root_key, root_item); |
| 1451 | BUG_ON(ret); |
| 1452 | kfree(root_item); |
| 1453 | |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 1454 | reloc_root = btrfs_read_fs_root(root->fs_info->tree_root, &root_key); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1455 | BUG_ON(IS_ERR(reloc_root)); |
| 1456 | reloc_root->last_trans = trans->transid; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1457 | return reloc_root; |
| 1458 | } |
| 1459 | |
| 1460 | /* |
| 1461 | * create reloc tree for a given fs tree. reloc tree is just a |
| 1462 | * snapshot of the fs tree with special root objectid. |
| 1463 | */ |
| 1464 | int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, |
| 1465 | struct btrfs_root *root) |
| 1466 | { |
| 1467 | struct btrfs_root *reloc_root; |
| 1468 | struct reloc_control *rc = root->fs_info->reloc_ctl; |
Miao Xie | 20dd2cb | 2013-09-25 21:47:45 +0800 | [diff] [blame] | 1469 | struct btrfs_block_rsv *rsv; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1470 | int clear_rsv = 0; |
Jeff Mahoney | ffd7b33 | 2011-10-03 23:23:15 -0400 | [diff] [blame] | 1471 | int ret; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1472 | |
| 1473 | if (root->reloc_root) { |
| 1474 | reloc_root = root->reloc_root; |
| 1475 | reloc_root->last_trans = trans->transid; |
| 1476 | return 0; |
| 1477 | } |
| 1478 | |
| 1479 | if (!rc || !rc->create_reloc_tree || |
| 1480 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) |
| 1481 | return 0; |
| 1482 | |
Miao Xie | 20dd2cb | 2013-09-25 21:47:45 +0800 | [diff] [blame] | 1483 | if (!trans->reloc_reserved) { |
| 1484 | rsv = trans->block_rsv; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1485 | trans->block_rsv = rc->block_rsv; |
| 1486 | clear_rsv = 1; |
| 1487 | } |
| 1488 | reloc_root = create_reloc_root(trans, root, root->root_key.objectid); |
| 1489 | if (clear_rsv) |
Miao Xie | 20dd2cb | 2013-09-25 21:47:45 +0800 | [diff] [blame] | 1490 | trans->block_rsv = rsv; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1491 | |
Jeff Mahoney | ffd7b33 | 2011-10-03 23:23:15 -0400 | [diff] [blame] | 1492 | ret = __add_reloc_root(reloc_root); |
| 1493 | BUG_ON(ret < 0); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1494 | root->reloc_root = reloc_root; |
| 1495 | return 0; |
| 1496 | } |
| 1497 | |
| 1498 | /* |
| 1499 | * update root item of reloc tree |
| 1500 | */ |
| 1501 | int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, |
| 1502 | struct btrfs_root *root) |
| 1503 | { |
| 1504 | struct btrfs_root *reloc_root; |
| 1505 | struct btrfs_root_item *root_item; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1506 | int ret; |
| 1507 | |
| 1508 | if (!root->reloc_root) |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1509 | goto out; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1510 | |
| 1511 | reloc_root = root->reloc_root; |
| 1512 | root_item = &reloc_root->root_item; |
| 1513 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1514 | if (root->fs_info->reloc_ctl->merge_reloc_tree && |
| 1515 | btrfs_root_refs(root_item) == 0) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1516 | root->reloc_root = NULL; |
Wang Shilong | c974c46 | 2013-12-11 19:29:51 +0800 | [diff] [blame] | 1517 | __del_reloc_root(reloc_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1518 | } |
| 1519 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1520 | if (reloc_root->commit_root != reloc_root->node) { |
| 1521 | btrfs_set_root_node(root_item, reloc_root->node); |
| 1522 | free_extent_buffer(reloc_root->commit_root); |
| 1523 | reloc_root->commit_root = btrfs_root_node(reloc_root); |
| 1524 | } |
| 1525 | |
| 1526 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
| 1527 | &reloc_root->root_key, root_item); |
| 1528 | BUG_ON(ret); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 1529 | |
| 1530 | out: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1531 | return 0; |
| 1532 | } |
| 1533 | |
| 1534 | /* |
| 1535 | * helper to find first cached inode with inode number >= objectid |
| 1536 | * in a subvolume |
| 1537 | */ |
| 1538 | static struct inode *find_next_inode(struct btrfs_root *root, u64 objectid) |
| 1539 | { |
| 1540 | struct rb_node *node; |
| 1541 | struct rb_node *prev; |
| 1542 | struct btrfs_inode *entry; |
| 1543 | struct inode *inode; |
| 1544 | |
| 1545 | spin_lock(&root->inode_lock); |
| 1546 | again: |
| 1547 | node = root->inode_tree.rb_node; |
| 1548 | prev = NULL; |
| 1549 | while (node) { |
| 1550 | prev = node; |
| 1551 | entry = rb_entry(node, struct btrfs_inode, rb_node); |
| 1552 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1553 | if (objectid < btrfs_ino(&entry->vfs_inode)) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1554 | node = node->rb_left; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1555 | else if (objectid > btrfs_ino(&entry->vfs_inode)) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1556 | node = node->rb_right; |
| 1557 | else |
| 1558 | break; |
| 1559 | } |
| 1560 | if (!node) { |
| 1561 | while (prev) { |
| 1562 | entry = rb_entry(prev, struct btrfs_inode, rb_node); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1563 | if (objectid <= btrfs_ino(&entry->vfs_inode)) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1564 | node = prev; |
| 1565 | break; |
| 1566 | } |
| 1567 | prev = rb_next(prev); |
| 1568 | } |
| 1569 | } |
| 1570 | while (node) { |
| 1571 | entry = rb_entry(node, struct btrfs_inode, rb_node); |
| 1572 | inode = igrab(&entry->vfs_inode); |
| 1573 | if (inode) { |
| 1574 | spin_unlock(&root->inode_lock); |
| 1575 | return inode; |
| 1576 | } |
| 1577 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1578 | objectid = btrfs_ino(&entry->vfs_inode) + 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1579 | if (cond_resched_lock(&root->inode_lock)) |
| 1580 | goto again; |
| 1581 | |
| 1582 | node = rb_next(node); |
| 1583 | } |
| 1584 | spin_unlock(&root->inode_lock); |
| 1585 | return NULL; |
| 1586 | } |
| 1587 | |
| 1588 | static int in_block_group(u64 bytenr, |
| 1589 | struct btrfs_block_group_cache *block_group) |
| 1590 | { |
| 1591 | if (bytenr >= block_group->key.objectid && |
| 1592 | bytenr < block_group->key.objectid + block_group->key.offset) |
| 1593 | return 1; |
| 1594 | return 0; |
| 1595 | } |
| 1596 | |
| 1597 | /* |
| 1598 | * get new location of data |
| 1599 | */ |
| 1600 | static int get_new_location(struct inode *reloc_inode, u64 *new_bytenr, |
| 1601 | u64 bytenr, u64 num_bytes) |
| 1602 | { |
| 1603 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; |
| 1604 | struct btrfs_path *path; |
| 1605 | struct btrfs_file_extent_item *fi; |
| 1606 | struct extent_buffer *leaf; |
| 1607 | int ret; |
| 1608 | |
| 1609 | path = btrfs_alloc_path(); |
| 1610 | if (!path) |
| 1611 | return -ENOMEM; |
| 1612 | |
| 1613 | bytenr -= BTRFS_I(reloc_inode)->index_cnt; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1614 | ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(reloc_inode), |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1615 | bytenr, 0); |
| 1616 | if (ret < 0) |
| 1617 | goto out; |
| 1618 | if (ret > 0) { |
| 1619 | ret = -ENOENT; |
| 1620 | goto out; |
| 1621 | } |
| 1622 | |
| 1623 | leaf = path->nodes[0]; |
| 1624 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1625 | struct btrfs_file_extent_item); |
| 1626 | |
| 1627 | BUG_ON(btrfs_file_extent_offset(leaf, fi) || |
| 1628 | btrfs_file_extent_compression(leaf, fi) || |
| 1629 | btrfs_file_extent_encryption(leaf, fi) || |
| 1630 | btrfs_file_extent_other_encoding(leaf, fi)); |
| 1631 | |
| 1632 | if (num_bytes != btrfs_file_extent_disk_num_bytes(leaf, fi)) { |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 1633 | ret = -EINVAL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1634 | goto out; |
| 1635 | } |
| 1636 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1637 | *new_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1638 | ret = 0; |
| 1639 | out: |
| 1640 | btrfs_free_path(path); |
| 1641 | return ret; |
| 1642 | } |
| 1643 | |
| 1644 | /* |
| 1645 | * update file extent items in the tree leaf to point to |
| 1646 | * the new locations. |
| 1647 | */ |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1648 | static noinline_for_stack |
| 1649 | int replace_file_extents(struct btrfs_trans_handle *trans, |
| 1650 | struct reloc_control *rc, |
| 1651 | struct btrfs_root *root, |
| 1652 | struct extent_buffer *leaf) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1653 | { |
| 1654 | struct btrfs_key key; |
| 1655 | struct btrfs_file_extent_item *fi; |
| 1656 | struct inode *inode = NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1657 | u64 parent; |
| 1658 | u64 bytenr; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1659 | u64 new_bytenr = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1660 | u64 num_bytes; |
| 1661 | u64 end; |
| 1662 | u32 nritems; |
| 1663 | u32 i; |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 1664 | int ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1665 | int first = 1; |
| 1666 | int dirty = 0; |
| 1667 | |
| 1668 | if (rc->stage != UPDATE_DATA_PTRS) |
| 1669 | return 0; |
| 1670 | |
| 1671 | /* reloc trees always use full backref */ |
| 1672 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) |
| 1673 | parent = leaf->start; |
| 1674 | else |
| 1675 | parent = 0; |
| 1676 | |
| 1677 | nritems = btrfs_header_nritems(leaf); |
| 1678 | for (i = 0; i < nritems; i++) { |
| 1679 | cond_resched(); |
| 1680 | btrfs_item_key_to_cpu(leaf, &key, i); |
| 1681 | if (key.type != BTRFS_EXTENT_DATA_KEY) |
| 1682 | continue; |
| 1683 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
| 1684 | if (btrfs_file_extent_type(leaf, fi) == |
| 1685 | BTRFS_FILE_EXTENT_INLINE) |
| 1686 | continue; |
| 1687 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 1688 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
| 1689 | if (bytenr == 0) |
| 1690 | continue; |
| 1691 | if (!in_block_group(bytenr, rc->block_group)) |
| 1692 | continue; |
| 1693 | |
| 1694 | /* |
| 1695 | * if we are modifying block in fs tree, wait for readpage |
| 1696 | * to complete and drop the extent cache |
| 1697 | */ |
| 1698 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1699 | if (first) { |
| 1700 | inode = find_next_inode(root, key.objectid); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1701 | first = 0; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1702 | } else if (inode && btrfs_ino(inode) < key.objectid) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1703 | btrfs_add_delayed_iput(inode); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1704 | inode = find_next_inode(root, key.objectid); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1705 | } |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1706 | if (inode && btrfs_ino(inode) == key.objectid) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1707 | end = key.offset + |
| 1708 | btrfs_file_extent_num_bytes(leaf, fi); |
| 1709 | WARN_ON(!IS_ALIGNED(key.offset, |
| 1710 | root->sectorsize)); |
| 1711 | WARN_ON(!IS_ALIGNED(end, root->sectorsize)); |
| 1712 | end--; |
| 1713 | ret = try_lock_extent(&BTRFS_I(inode)->io_tree, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 1714 | key.offset, end); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1715 | if (!ret) |
| 1716 | continue; |
| 1717 | |
| 1718 | btrfs_drop_extent_cache(inode, key.offset, end, |
| 1719 | 1); |
| 1720 | unlock_extent(&BTRFS_I(inode)->io_tree, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 1721 | key.offset, end); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1722 | } |
| 1723 | } |
| 1724 | |
| 1725 | ret = get_new_location(rc->data_inode, &new_bytenr, |
| 1726 | bytenr, num_bytes); |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 1727 | if (ret) { |
| 1728 | /* |
| 1729 | * Don't have to abort since we've not changed anything |
| 1730 | * in the file extent yet. |
| 1731 | */ |
| 1732 | break; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1733 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1734 | |
| 1735 | btrfs_set_file_extent_disk_bytenr(leaf, fi, new_bytenr); |
| 1736 | dirty = 1; |
| 1737 | |
| 1738 | key.offset -= btrfs_file_extent_offset(leaf, fi); |
| 1739 | ret = btrfs_inc_extent_ref(trans, root, new_bytenr, |
| 1740 | num_bytes, parent, |
| 1741 | btrfs_header_owner(leaf), |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 1742 | key.objectid, key.offset); |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 1743 | if (ret) { |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 1744 | btrfs_abort_transaction(trans, ret); |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 1745 | break; |
| 1746 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1747 | |
| 1748 | ret = btrfs_free_extent(trans, root, bytenr, num_bytes, |
| 1749 | parent, btrfs_header_owner(leaf), |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 1750 | key.objectid, key.offset); |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 1751 | if (ret) { |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 1752 | btrfs_abort_transaction(trans, ret); |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 1753 | break; |
| 1754 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1755 | } |
| 1756 | if (dirty) |
| 1757 | btrfs_mark_buffer_dirty(leaf); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1758 | if (inode) |
| 1759 | btrfs_add_delayed_iput(inode); |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 1760 | return ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1761 | } |
| 1762 | |
| 1763 | static noinline_for_stack |
| 1764 | int memcmp_node_keys(struct extent_buffer *eb, int slot, |
| 1765 | struct btrfs_path *path, int level) |
| 1766 | { |
| 1767 | struct btrfs_disk_key key1; |
| 1768 | struct btrfs_disk_key key2; |
| 1769 | btrfs_node_key(eb, &key1, slot); |
| 1770 | btrfs_node_key(path->nodes[level], &key2, path->slots[level]); |
| 1771 | return memcmp(&key1, &key2, sizeof(key1)); |
| 1772 | } |
| 1773 | |
| 1774 | /* |
| 1775 | * try to replace tree blocks in fs tree with the new blocks |
| 1776 | * in reloc tree. tree blocks haven't been modified since the |
| 1777 | * reloc tree was create can be replaced. |
| 1778 | * |
| 1779 | * if a block was replaced, level of the block + 1 is returned. |
| 1780 | * if no block got replaced, 0 is returned. if there are other |
| 1781 | * errors, a negative error number is returned. |
| 1782 | */ |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1783 | static noinline_for_stack |
| 1784 | int replace_path(struct btrfs_trans_handle *trans, |
| 1785 | struct btrfs_root *dest, struct btrfs_root *src, |
| 1786 | struct btrfs_path *path, struct btrfs_key *next_key, |
| 1787 | int lowest_level, int max_level) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1788 | { |
| 1789 | struct extent_buffer *eb; |
| 1790 | struct extent_buffer *parent; |
| 1791 | struct btrfs_key key; |
| 1792 | u64 old_bytenr; |
| 1793 | u64 new_bytenr; |
| 1794 | u64 old_ptr_gen; |
| 1795 | u64 new_ptr_gen; |
| 1796 | u64 last_snapshot; |
| 1797 | u32 blocksize; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1798 | int cow = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1799 | int level; |
| 1800 | int ret; |
| 1801 | int slot; |
| 1802 | |
| 1803 | BUG_ON(src->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
| 1804 | BUG_ON(dest->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1805 | |
| 1806 | last_snapshot = btrfs_root_last_snapshot(&src->root_item); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1807 | again: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1808 | slot = path->slots[lowest_level]; |
| 1809 | btrfs_node_key_to_cpu(path->nodes[lowest_level], &key, slot); |
| 1810 | |
| 1811 | eb = btrfs_lock_root_node(dest); |
| 1812 | btrfs_set_lock_blocking(eb); |
| 1813 | level = btrfs_header_level(eb); |
| 1814 | |
| 1815 | if (level < lowest_level) { |
| 1816 | btrfs_tree_unlock(eb); |
| 1817 | free_extent_buffer(eb); |
| 1818 | return 0; |
| 1819 | } |
| 1820 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1821 | if (cow) { |
| 1822 | ret = btrfs_cow_block(trans, dest, eb, NULL, 0, &eb); |
| 1823 | BUG_ON(ret); |
| 1824 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1825 | btrfs_set_lock_blocking(eb); |
| 1826 | |
| 1827 | if (next_key) { |
| 1828 | next_key->objectid = (u64)-1; |
| 1829 | next_key->type = (u8)-1; |
| 1830 | next_key->offset = (u64)-1; |
| 1831 | } |
| 1832 | |
| 1833 | parent = eb; |
| 1834 | while (1) { |
| 1835 | level = btrfs_header_level(parent); |
| 1836 | BUG_ON(level < lowest_level); |
| 1837 | |
| 1838 | ret = btrfs_bin_search(parent, &key, level, &slot); |
| 1839 | if (ret && slot > 0) |
| 1840 | slot--; |
| 1841 | |
| 1842 | if (next_key && slot + 1 < btrfs_header_nritems(parent)) |
| 1843 | btrfs_node_key_to_cpu(parent, next_key, slot + 1); |
| 1844 | |
| 1845 | old_bytenr = btrfs_node_blockptr(parent, slot); |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 1846 | blocksize = dest->nodesize; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1847 | old_ptr_gen = btrfs_node_ptr_generation(parent, slot); |
| 1848 | |
| 1849 | if (level <= max_level) { |
| 1850 | eb = path->nodes[level]; |
| 1851 | new_bytenr = btrfs_node_blockptr(eb, |
| 1852 | path->slots[level]); |
| 1853 | new_ptr_gen = btrfs_node_ptr_generation(eb, |
| 1854 | path->slots[level]); |
| 1855 | } else { |
| 1856 | new_bytenr = 0; |
| 1857 | new_ptr_gen = 0; |
| 1858 | } |
| 1859 | |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 1860 | if (WARN_ON(new_bytenr > 0 && new_bytenr == old_bytenr)) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1861 | ret = level; |
| 1862 | break; |
| 1863 | } |
| 1864 | |
| 1865 | if (new_bytenr == 0 || old_ptr_gen > last_snapshot || |
| 1866 | memcmp_node_keys(parent, slot, path, level)) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1867 | if (level <= lowest_level) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1868 | ret = 0; |
| 1869 | break; |
| 1870 | } |
| 1871 | |
David Sterba | ce86cd5 | 2014-06-15 01:07:32 +0200 | [diff] [blame] | 1872 | eb = read_tree_block(dest, old_bytenr, old_ptr_gen); |
Liu Bo | 64c043d | 2015-05-25 17:30:15 +0800 | [diff] [blame] | 1873 | if (IS_ERR(eb)) { |
| 1874 | ret = PTR_ERR(eb); |
Liu Bo | 264813a | 2016-03-21 14:59:53 -0700 | [diff] [blame] | 1875 | break; |
Liu Bo | 64c043d | 2015-05-25 17:30:15 +0800 | [diff] [blame] | 1876 | } else if (!extent_buffer_uptodate(eb)) { |
| 1877 | ret = -EIO; |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 1878 | free_extent_buffer(eb); |
Stefan Behrens | 379cde7 | 2013-05-08 08:56:09 +0000 | [diff] [blame] | 1879 | break; |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 1880 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1881 | btrfs_tree_lock(eb); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1882 | if (cow) { |
| 1883 | ret = btrfs_cow_block(trans, dest, eb, parent, |
| 1884 | slot, &eb); |
| 1885 | BUG_ON(ret); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1886 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1887 | btrfs_set_lock_blocking(eb); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1888 | |
| 1889 | btrfs_tree_unlock(parent); |
| 1890 | free_extent_buffer(parent); |
| 1891 | |
| 1892 | parent = eb; |
| 1893 | continue; |
| 1894 | } |
| 1895 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1896 | if (!cow) { |
| 1897 | btrfs_tree_unlock(parent); |
| 1898 | free_extent_buffer(parent); |
| 1899 | cow = 1; |
| 1900 | goto again; |
| 1901 | } |
| 1902 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1903 | btrfs_node_key_to_cpu(path->nodes[level], &key, |
| 1904 | path->slots[level]); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1905 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1906 | |
| 1907 | path->lowest_level = level; |
| 1908 | ret = btrfs_search_slot(trans, src, &key, path, 0, 1); |
| 1909 | path->lowest_level = 0; |
| 1910 | BUG_ON(ret); |
| 1911 | |
| 1912 | /* |
| 1913 | * swap blocks in fs tree and reloc tree. |
| 1914 | */ |
| 1915 | btrfs_set_node_blockptr(parent, slot, new_bytenr); |
| 1916 | btrfs_set_node_ptr_generation(parent, slot, new_ptr_gen); |
| 1917 | btrfs_mark_buffer_dirty(parent); |
| 1918 | |
| 1919 | btrfs_set_node_blockptr(path->nodes[level], |
| 1920 | path->slots[level], old_bytenr); |
| 1921 | btrfs_set_node_ptr_generation(path->nodes[level], |
| 1922 | path->slots[level], old_ptr_gen); |
| 1923 | btrfs_mark_buffer_dirty(path->nodes[level]); |
| 1924 | |
| 1925 | ret = btrfs_inc_extent_ref(trans, src, old_bytenr, blocksize, |
| 1926 | path->nodes[level]->start, |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 1927 | src->root_key.objectid, level - 1, 0); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1928 | BUG_ON(ret); |
| 1929 | ret = btrfs_inc_extent_ref(trans, dest, new_bytenr, blocksize, |
| 1930 | 0, dest->root_key.objectid, level - 1, |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 1931 | 0); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1932 | BUG_ON(ret); |
| 1933 | |
| 1934 | ret = btrfs_free_extent(trans, src, new_bytenr, blocksize, |
| 1935 | path->nodes[level]->start, |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 1936 | src->root_key.objectid, level - 1, 0); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1937 | BUG_ON(ret); |
| 1938 | |
| 1939 | ret = btrfs_free_extent(trans, dest, old_bytenr, blocksize, |
| 1940 | 0, dest->root_key.objectid, level - 1, |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 1941 | 0); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1942 | BUG_ON(ret); |
| 1943 | |
| 1944 | btrfs_unlock_up_safe(path, 0); |
| 1945 | |
| 1946 | ret = level; |
| 1947 | break; |
| 1948 | } |
| 1949 | btrfs_tree_unlock(parent); |
| 1950 | free_extent_buffer(parent); |
| 1951 | return ret; |
| 1952 | } |
| 1953 | |
| 1954 | /* |
| 1955 | * helper to find next relocated block in reloc tree |
| 1956 | */ |
| 1957 | static noinline_for_stack |
| 1958 | int walk_up_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, |
| 1959 | int *level) |
| 1960 | { |
| 1961 | struct extent_buffer *eb; |
| 1962 | int i; |
| 1963 | u64 last_snapshot; |
| 1964 | u32 nritems; |
| 1965 | |
| 1966 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); |
| 1967 | |
| 1968 | for (i = 0; i < *level; i++) { |
| 1969 | free_extent_buffer(path->nodes[i]); |
| 1970 | path->nodes[i] = NULL; |
| 1971 | } |
| 1972 | |
| 1973 | for (i = *level; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) { |
| 1974 | eb = path->nodes[i]; |
| 1975 | nritems = btrfs_header_nritems(eb); |
| 1976 | while (path->slots[i] + 1 < nritems) { |
| 1977 | path->slots[i]++; |
| 1978 | if (btrfs_node_ptr_generation(eb, path->slots[i]) <= |
| 1979 | last_snapshot) |
| 1980 | continue; |
| 1981 | |
| 1982 | *level = i; |
| 1983 | return 0; |
| 1984 | } |
| 1985 | free_extent_buffer(path->nodes[i]); |
| 1986 | path->nodes[i] = NULL; |
| 1987 | } |
| 1988 | return 1; |
| 1989 | } |
| 1990 | |
| 1991 | /* |
| 1992 | * walk down reloc tree to find relocated block of lowest level |
| 1993 | */ |
| 1994 | static noinline_for_stack |
| 1995 | int walk_down_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, |
| 1996 | int *level) |
| 1997 | { |
| 1998 | struct extent_buffer *eb = NULL; |
| 1999 | int i; |
| 2000 | u64 bytenr; |
| 2001 | u64 ptr_gen = 0; |
| 2002 | u64 last_snapshot; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2003 | u32 nritems; |
| 2004 | |
| 2005 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); |
| 2006 | |
| 2007 | for (i = *level; i > 0; i--) { |
| 2008 | eb = path->nodes[i]; |
| 2009 | nritems = btrfs_header_nritems(eb); |
| 2010 | while (path->slots[i] < nritems) { |
| 2011 | ptr_gen = btrfs_node_ptr_generation(eb, path->slots[i]); |
| 2012 | if (ptr_gen > last_snapshot) |
| 2013 | break; |
| 2014 | path->slots[i]++; |
| 2015 | } |
| 2016 | if (path->slots[i] >= nritems) { |
| 2017 | if (i == *level) |
| 2018 | break; |
| 2019 | *level = i + 1; |
| 2020 | return 0; |
| 2021 | } |
| 2022 | if (i == 1) { |
| 2023 | *level = i; |
| 2024 | return 0; |
| 2025 | } |
| 2026 | |
| 2027 | bytenr = btrfs_node_blockptr(eb, path->slots[i]); |
David Sterba | ce86cd5 | 2014-06-15 01:07:32 +0200 | [diff] [blame] | 2028 | eb = read_tree_block(root, bytenr, ptr_gen); |
Liu Bo | 64c043d | 2015-05-25 17:30:15 +0800 | [diff] [blame] | 2029 | if (IS_ERR(eb)) { |
| 2030 | return PTR_ERR(eb); |
| 2031 | } else if (!extent_buffer_uptodate(eb)) { |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 2032 | free_extent_buffer(eb); |
| 2033 | return -EIO; |
| 2034 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2035 | BUG_ON(btrfs_header_level(eb) != i - 1); |
| 2036 | path->nodes[i - 1] = eb; |
| 2037 | path->slots[i - 1] = 0; |
| 2038 | } |
| 2039 | return 1; |
| 2040 | } |
| 2041 | |
| 2042 | /* |
| 2043 | * invalidate extent cache for file extents whose key in range of |
| 2044 | * [min_key, max_key) |
| 2045 | */ |
| 2046 | static int invalidate_extent_cache(struct btrfs_root *root, |
| 2047 | struct btrfs_key *min_key, |
| 2048 | struct btrfs_key *max_key) |
| 2049 | { |
| 2050 | struct inode *inode = NULL; |
| 2051 | u64 objectid; |
| 2052 | u64 start, end; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2053 | u64 ino; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2054 | |
| 2055 | objectid = min_key->objectid; |
| 2056 | while (1) { |
| 2057 | cond_resched(); |
| 2058 | iput(inode); |
| 2059 | |
| 2060 | if (objectid > max_key->objectid) |
| 2061 | break; |
| 2062 | |
| 2063 | inode = find_next_inode(root, objectid); |
| 2064 | if (!inode) |
| 2065 | break; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2066 | ino = btrfs_ino(inode); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2067 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2068 | if (ino > max_key->objectid) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2069 | iput(inode); |
| 2070 | break; |
| 2071 | } |
| 2072 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2073 | objectid = ino + 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2074 | if (!S_ISREG(inode->i_mode)) |
| 2075 | continue; |
| 2076 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2077 | if (unlikely(min_key->objectid == ino)) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2078 | if (min_key->type > BTRFS_EXTENT_DATA_KEY) |
| 2079 | continue; |
| 2080 | if (min_key->type < BTRFS_EXTENT_DATA_KEY) |
| 2081 | start = 0; |
| 2082 | else { |
| 2083 | start = min_key->offset; |
| 2084 | WARN_ON(!IS_ALIGNED(start, root->sectorsize)); |
| 2085 | } |
| 2086 | } else { |
| 2087 | start = 0; |
| 2088 | } |
| 2089 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2090 | if (unlikely(max_key->objectid == ino)) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2091 | if (max_key->type < BTRFS_EXTENT_DATA_KEY) |
| 2092 | continue; |
| 2093 | if (max_key->type > BTRFS_EXTENT_DATA_KEY) { |
| 2094 | end = (u64)-1; |
| 2095 | } else { |
| 2096 | if (max_key->offset == 0) |
| 2097 | continue; |
| 2098 | end = max_key->offset; |
| 2099 | WARN_ON(!IS_ALIGNED(end, root->sectorsize)); |
| 2100 | end--; |
| 2101 | } |
| 2102 | } else { |
| 2103 | end = (u64)-1; |
| 2104 | } |
| 2105 | |
| 2106 | /* the lock_extent waits for readpage to complete */ |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 2107 | lock_extent(&BTRFS_I(inode)->io_tree, start, end); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2108 | btrfs_drop_extent_cache(inode, start, end, 1); |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 2109 | unlock_extent(&BTRFS_I(inode)->io_tree, start, end); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2110 | } |
| 2111 | return 0; |
| 2112 | } |
| 2113 | |
| 2114 | static int find_next_key(struct btrfs_path *path, int level, |
| 2115 | struct btrfs_key *key) |
| 2116 | |
| 2117 | { |
| 2118 | while (level < BTRFS_MAX_LEVEL) { |
| 2119 | if (!path->nodes[level]) |
| 2120 | break; |
| 2121 | if (path->slots[level] + 1 < |
| 2122 | btrfs_header_nritems(path->nodes[level])) { |
| 2123 | btrfs_node_key_to_cpu(path->nodes[level], key, |
| 2124 | path->slots[level] + 1); |
| 2125 | return 0; |
| 2126 | } |
| 2127 | level++; |
| 2128 | } |
| 2129 | return 1; |
| 2130 | } |
| 2131 | |
| 2132 | /* |
| 2133 | * merge the relocated tree blocks in reloc tree with corresponding |
| 2134 | * fs tree. |
| 2135 | */ |
| 2136 | static noinline_for_stack int merge_reloc_root(struct reloc_control *rc, |
| 2137 | struct btrfs_root *root) |
| 2138 | { |
| 2139 | LIST_HEAD(inode_list); |
| 2140 | struct btrfs_key key; |
| 2141 | struct btrfs_key next_key; |
Josef Bacik | 9e6a0c5 | 2013-10-31 10:07:19 -0400 | [diff] [blame] | 2142 | struct btrfs_trans_handle *trans = NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2143 | struct btrfs_root *reloc_root; |
| 2144 | struct btrfs_root_item *root_item; |
| 2145 | struct btrfs_path *path; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2146 | struct extent_buffer *leaf; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2147 | int level; |
| 2148 | int max_level; |
| 2149 | int replaced = 0; |
| 2150 | int ret; |
| 2151 | int err = 0; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2152 | u32 min_reserved; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2153 | |
| 2154 | path = btrfs_alloc_path(); |
| 2155 | if (!path) |
| 2156 | return -ENOMEM; |
David Sterba | e4058b5 | 2015-11-27 16:31:35 +0100 | [diff] [blame] | 2157 | path->reada = READA_FORWARD; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2158 | |
| 2159 | reloc_root = root->reloc_root; |
| 2160 | root_item = &reloc_root->root_item; |
| 2161 | |
| 2162 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
| 2163 | level = btrfs_root_level(root_item); |
| 2164 | extent_buffer_get(reloc_root->node); |
| 2165 | path->nodes[level] = reloc_root->node; |
| 2166 | path->slots[level] = 0; |
| 2167 | } else { |
| 2168 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
| 2169 | |
| 2170 | level = root_item->drop_level; |
| 2171 | BUG_ON(level == 0); |
| 2172 | path->lowest_level = level; |
| 2173 | ret = btrfs_search_slot(NULL, reloc_root, &key, path, 0, 0); |
Yan Zheng | 33c66f4 | 2009-07-22 09:59:00 -0400 | [diff] [blame] | 2174 | path->lowest_level = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2175 | if (ret < 0) { |
| 2176 | btrfs_free_path(path); |
| 2177 | return ret; |
| 2178 | } |
| 2179 | |
| 2180 | btrfs_node_key_to_cpu(path->nodes[level], &next_key, |
| 2181 | path->slots[level]); |
| 2182 | WARN_ON(memcmp(&key, &next_key, sizeof(key))); |
| 2183 | |
| 2184 | btrfs_unlock_up_safe(path, 0); |
| 2185 | } |
| 2186 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2187 | min_reserved = root->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2188 | memset(&next_key, 0, sizeof(next_key)); |
| 2189 | |
| 2190 | while (1) { |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 2191 | ret = btrfs_block_rsv_refill(root, rc->block_rsv, min_reserved, |
| 2192 | BTRFS_RESERVE_FLUSH_ALL); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2193 | if (ret) { |
Josef Bacik | 9e6a0c5 | 2013-10-31 10:07:19 -0400 | [diff] [blame] | 2194 | err = ret; |
| 2195 | goto out; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2196 | } |
Josef Bacik | 9e6a0c5 | 2013-10-31 10:07:19 -0400 | [diff] [blame] | 2197 | trans = btrfs_start_transaction(root, 0); |
| 2198 | if (IS_ERR(trans)) { |
| 2199 | err = PTR_ERR(trans); |
| 2200 | trans = NULL; |
| 2201 | goto out; |
| 2202 | } |
| 2203 | trans->block_rsv = rc->block_rsv; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2204 | |
| 2205 | replaced = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2206 | max_level = level; |
| 2207 | |
| 2208 | ret = walk_down_reloc_tree(reloc_root, path, &level); |
| 2209 | if (ret < 0) { |
| 2210 | err = ret; |
| 2211 | goto out; |
| 2212 | } |
| 2213 | if (ret > 0) |
| 2214 | break; |
| 2215 | |
| 2216 | if (!find_next_key(path, level, &key) && |
| 2217 | btrfs_comp_cpu_keys(&next_key, &key) >= 0) { |
| 2218 | ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2219 | } else { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2220 | ret = replace_path(trans, root, reloc_root, path, |
| 2221 | &next_key, level, max_level); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2222 | } |
| 2223 | if (ret < 0) { |
| 2224 | err = ret; |
| 2225 | goto out; |
| 2226 | } |
| 2227 | |
| 2228 | if (ret > 0) { |
| 2229 | level = ret; |
| 2230 | btrfs_node_key_to_cpu(path->nodes[level], &key, |
| 2231 | path->slots[level]); |
| 2232 | replaced = 1; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2233 | } |
| 2234 | |
| 2235 | ret = walk_up_reloc_tree(reloc_root, path, &level); |
| 2236 | if (ret > 0) |
| 2237 | break; |
| 2238 | |
| 2239 | BUG_ON(level == 0); |
| 2240 | /* |
| 2241 | * save the merging progress in the drop_progress. |
| 2242 | * this is OK since root refs == 1 in this case. |
| 2243 | */ |
| 2244 | btrfs_node_key(path->nodes[level], &root_item->drop_progress, |
| 2245 | path->slots[level]); |
| 2246 | root_item->drop_level = level; |
| 2247 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2248 | btrfs_end_transaction_throttle(trans, root); |
Josef Bacik | 9e6a0c5 | 2013-10-31 10:07:19 -0400 | [diff] [blame] | 2249 | trans = NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2250 | |
Liu Bo | b53d3f5 | 2012-11-14 14:34:34 +0000 | [diff] [blame] | 2251 | btrfs_btree_balance_dirty(root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2252 | |
| 2253 | if (replaced && rc->stage == UPDATE_DATA_PTRS) |
| 2254 | invalidate_extent_cache(root, &key, &next_key); |
| 2255 | } |
| 2256 | |
| 2257 | /* |
| 2258 | * handle the case only one block in the fs tree need to be |
| 2259 | * relocated and the block is tree root. |
| 2260 | */ |
| 2261 | leaf = btrfs_lock_root_node(root); |
| 2262 | ret = btrfs_cow_block(trans, root, leaf, NULL, 0, &leaf); |
| 2263 | btrfs_tree_unlock(leaf); |
| 2264 | free_extent_buffer(leaf); |
| 2265 | if (ret < 0) |
| 2266 | err = ret; |
| 2267 | out: |
| 2268 | btrfs_free_path(path); |
| 2269 | |
| 2270 | if (err == 0) { |
| 2271 | memset(&root_item->drop_progress, 0, |
| 2272 | sizeof(root_item->drop_progress)); |
| 2273 | root_item->drop_level = 0; |
| 2274 | btrfs_set_root_refs(root_item, 0); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2275 | btrfs_update_reloc_root(trans, root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2276 | } |
| 2277 | |
Josef Bacik | 9e6a0c5 | 2013-10-31 10:07:19 -0400 | [diff] [blame] | 2278 | if (trans) |
| 2279 | btrfs_end_transaction_throttle(trans, root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2280 | |
Liu Bo | b53d3f5 | 2012-11-14 14:34:34 +0000 | [diff] [blame] | 2281 | btrfs_btree_balance_dirty(root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2282 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2283 | if (replaced && rc->stage == UPDATE_DATA_PTRS) |
| 2284 | invalidate_extent_cache(root, &key, &next_key); |
| 2285 | |
| 2286 | return err; |
| 2287 | } |
| 2288 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2289 | static noinline_for_stack |
| 2290 | int prepare_to_merge(struct reloc_control *rc, int err) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2291 | { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2292 | struct btrfs_root *root = rc->extent_root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2293 | struct btrfs_root *reloc_root; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2294 | struct btrfs_trans_handle *trans; |
| 2295 | LIST_HEAD(reloc_roots); |
| 2296 | u64 num_bytes = 0; |
| 2297 | int ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2298 | |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 2299 | mutex_lock(&root->fs_info->reloc_mutex); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2300 | rc->merging_rsv_size += root->nodesize * (BTRFS_MAX_LEVEL - 1) * 2; |
| 2301 | rc->merging_rsv_size += rc->nodes_relocated * 2; |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 2302 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 2303 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2304 | again: |
| 2305 | if (!err) { |
| 2306 | num_bytes = rc->merging_rsv_size; |
Miao Xie | 08e007d | 2012-10-16 11:33:38 +0000 | [diff] [blame] | 2307 | ret = btrfs_block_rsv_add(root, rc->block_rsv, num_bytes, |
| 2308 | BTRFS_RESERVE_FLUSH_ALL); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2309 | if (ret) |
| 2310 | err = ret; |
| 2311 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2312 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 2313 | trans = btrfs_join_transaction(rc->extent_root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 2314 | if (IS_ERR(trans)) { |
| 2315 | if (!err) |
| 2316 | btrfs_block_rsv_release(rc->extent_root, |
| 2317 | rc->block_rsv, num_bytes); |
| 2318 | return PTR_ERR(trans); |
| 2319 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2320 | |
| 2321 | if (!err) { |
| 2322 | if (num_bytes != rc->merging_rsv_size) { |
| 2323 | btrfs_end_transaction(trans, rc->extent_root); |
| 2324 | btrfs_block_rsv_release(rc->extent_root, |
| 2325 | rc->block_rsv, num_bytes); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2326 | goto again; |
| 2327 | } |
| 2328 | } |
| 2329 | |
| 2330 | rc->merge_reloc_tree = 1; |
| 2331 | |
| 2332 | while (!list_empty(&rc->reloc_roots)) { |
| 2333 | reloc_root = list_entry(rc->reloc_roots.next, |
| 2334 | struct btrfs_root, root_list); |
| 2335 | list_del_init(&reloc_root->root_list); |
| 2336 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2337 | root = read_fs_root(reloc_root->fs_info, |
| 2338 | reloc_root->root_key.offset); |
| 2339 | BUG_ON(IS_ERR(root)); |
| 2340 | BUG_ON(root->reloc_root != reloc_root); |
| 2341 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2342 | /* |
| 2343 | * set reference count to 1, so btrfs_recover_relocation |
| 2344 | * knows it should resumes merging |
| 2345 | */ |
| 2346 | if (!err) |
| 2347 | btrfs_set_root_refs(&reloc_root->root_item, 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2348 | btrfs_update_reloc_root(trans, root); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2349 | |
| 2350 | list_add(&reloc_root->root_list, &reloc_roots); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2351 | } |
| 2352 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2353 | list_splice(&reloc_roots, &rc->reloc_roots); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2354 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2355 | if (!err) |
| 2356 | btrfs_commit_transaction(trans, rc->extent_root); |
| 2357 | else |
| 2358 | btrfs_end_transaction(trans, rc->extent_root); |
| 2359 | return err; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2360 | } |
| 2361 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2362 | static noinline_for_stack |
Liu Bo | aca1bba | 2013-03-04 16:25:37 +0000 | [diff] [blame] | 2363 | void free_reloc_roots(struct list_head *list) |
| 2364 | { |
| 2365 | struct btrfs_root *reloc_root; |
| 2366 | |
| 2367 | while (!list_empty(list)) { |
| 2368 | reloc_root = list_entry(list->next, struct btrfs_root, |
| 2369 | root_list); |
Josef Bacik | 6bdf131 | 2016-09-02 15:25:43 -0400 | [diff] [blame] | 2370 | free_extent_buffer(reloc_root->node); |
| 2371 | free_extent_buffer(reloc_root->commit_root); |
| 2372 | reloc_root->node = NULL; |
| 2373 | reloc_root->commit_root = NULL; |
Wang Shilong | c974c46 | 2013-12-11 19:29:51 +0800 | [diff] [blame] | 2374 | __del_reloc_root(reloc_root); |
Liu Bo | aca1bba | 2013-03-04 16:25:37 +0000 | [diff] [blame] | 2375 | } |
| 2376 | } |
| 2377 | |
| 2378 | static noinline_for_stack |
David Sterba | 94404e8 | 2014-07-30 01:53:30 +0200 | [diff] [blame] | 2379 | void merge_reloc_roots(struct reloc_control *rc) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2380 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2381 | struct btrfs_root *root; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2382 | struct btrfs_root *reloc_root; |
Miao Xie | 5bc7247 | 2013-06-06 03:28:03 +0000 | [diff] [blame] | 2383 | u64 last_snap; |
| 2384 | u64 otransid; |
| 2385 | u64 objectid; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2386 | LIST_HEAD(reloc_roots); |
| 2387 | int found = 0; |
Liu Bo | aca1bba | 2013-03-04 16:25:37 +0000 | [diff] [blame] | 2388 | int ret = 0; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2389 | again: |
| 2390 | root = rc->extent_root; |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 2391 | |
| 2392 | /* |
| 2393 | * this serializes us with btrfs_record_root_in_transaction, |
| 2394 | * we have to make sure nobody is in the middle of |
| 2395 | * adding their roots to the list while we are |
| 2396 | * doing this splice |
| 2397 | */ |
| 2398 | mutex_lock(&root->fs_info->reloc_mutex); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2399 | list_splice_init(&rc->reloc_roots, &reloc_roots); |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 2400 | mutex_unlock(&root->fs_info->reloc_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2401 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2402 | while (!list_empty(&reloc_roots)) { |
| 2403 | found = 1; |
| 2404 | reloc_root = list_entry(reloc_roots.next, |
| 2405 | struct btrfs_root, root_list); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2406 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2407 | if (btrfs_root_refs(&reloc_root->root_item) > 0) { |
| 2408 | root = read_fs_root(reloc_root->fs_info, |
| 2409 | reloc_root->root_key.offset); |
| 2410 | BUG_ON(IS_ERR(root)); |
| 2411 | BUG_ON(root->reloc_root != reloc_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2412 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2413 | ret = merge_reloc_root(rc, root); |
Josef Bacik | b37b39c | 2013-07-23 16:57:15 -0400 | [diff] [blame] | 2414 | if (ret) { |
Wang Shilong | 25e293c | 2013-12-26 13:10:50 +0800 | [diff] [blame] | 2415 | if (list_empty(&reloc_root->root_list)) |
| 2416 | list_add_tail(&reloc_root->root_list, |
| 2417 | &reloc_roots); |
Liu Bo | aca1bba | 2013-03-04 16:25:37 +0000 | [diff] [blame] | 2418 | goto out; |
Josef Bacik | b37b39c | 2013-07-23 16:57:15 -0400 | [diff] [blame] | 2419 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2420 | } else { |
| 2421 | list_del_init(&reloc_root->root_list); |
| 2422 | } |
Miao Xie | 5bc7247 | 2013-06-06 03:28:03 +0000 | [diff] [blame] | 2423 | |
| 2424 | /* |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 2425 | * we keep the old last snapshot transid in rtranid when we |
Miao Xie | 5bc7247 | 2013-06-06 03:28:03 +0000 | [diff] [blame] | 2426 | * created the relocation tree. |
| 2427 | */ |
| 2428 | last_snap = btrfs_root_rtransid(&reloc_root->root_item); |
| 2429 | otransid = btrfs_root_otransid(&reloc_root->root_item); |
| 2430 | objectid = reloc_root->root_key.offset; |
| 2431 | |
Jeff Mahoney | 2c53679 | 2011-10-03 23:22:41 -0400 | [diff] [blame] | 2432 | ret = btrfs_drop_snapshot(reloc_root, rc->block_rsv, 0, 1); |
Liu Bo | aca1bba | 2013-03-04 16:25:37 +0000 | [diff] [blame] | 2433 | if (ret < 0) { |
| 2434 | if (list_empty(&reloc_root->root_list)) |
| 2435 | list_add_tail(&reloc_root->root_list, |
| 2436 | &reloc_roots); |
| 2437 | goto out; |
| 2438 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2439 | } |
| 2440 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2441 | if (found) { |
| 2442 | found = 0; |
| 2443 | goto again; |
| 2444 | } |
Liu Bo | aca1bba | 2013-03-04 16:25:37 +0000 | [diff] [blame] | 2445 | out: |
| 2446 | if (ret) { |
Anand Jain | 34d9700 | 2016-03-16 16:43:06 +0800 | [diff] [blame] | 2447 | btrfs_handle_fs_error(root->fs_info, ret, NULL); |
Liu Bo | aca1bba | 2013-03-04 16:25:37 +0000 | [diff] [blame] | 2448 | if (!list_empty(&reloc_roots)) |
| 2449 | free_reloc_roots(&reloc_roots); |
Wang Shilong | 467bb1d | 2013-12-11 19:29:52 +0800 | [diff] [blame] | 2450 | |
| 2451 | /* new reloc root may be added */ |
| 2452 | mutex_lock(&root->fs_info->reloc_mutex); |
| 2453 | list_splice_init(&rc->reloc_roots, &reloc_roots); |
| 2454 | mutex_unlock(&root->fs_info->reloc_mutex); |
| 2455 | if (!list_empty(&reloc_roots)) |
| 2456 | free_reloc_roots(&reloc_roots); |
Liu Bo | aca1bba | 2013-03-04 16:25:37 +0000 | [diff] [blame] | 2457 | } |
| 2458 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2459 | BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2460 | } |
| 2461 | |
| 2462 | static void free_block_list(struct rb_root *blocks) |
| 2463 | { |
| 2464 | struct tree_block *block; |
| 2465 | struct rb_node *rb_node; |
| 2466 | while ((rb_node = rb_first(blocks))) { |
| 2467 | block = rb_entry(rb_node, struct tree_block, rb_node); |
| 2468 | rb_erase(rb_node, blocks); |
| 2469 | kfree(block); |
| 2470 | } |
| 2471 | } |
| 2472 | |
| 2473 | static int record_reloc_root_in_trans(struct btrfs_trans_handle *trans, |
| 2474 | struct btrfs_root *reloc_root) |
| 2475 | { |
| 2476 | struct btrfs_root *root; |
| 2477 | |
| 2478 | if (reloc_root->last_trans == trans->transid) |
| 2479 | return 0; |
| 2480 | |
| 2481 | root = read_fs_root(reloc_root->fs_info, reloc_root->root_key.offset); |
| 2482 | BUG_ON(IS_ERR(root)); |
| 2483 | BUG_ON(root->reloc_root != reloc_root); |
| 2484 | |
| 2485 | return btrfs_record_root_in_trans(trans, root); |
| 2486 | } |
| 2487 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2488 | static noinline_for_stack |
| 2489 | struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans, |
| 2490 | struct reloc_control *rc, |
| 2491 | struct backref_node *node, |
Wang Shilong | dc4103f | 2013-12-26 13:10:49 +0800 | [diff] [blame] | 2492 | struct backref_edge *edges[]) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2493 | { |
| 2494 | struct backref_node *next; |
| 2495 | struct btrfs_root *root; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2496 | int index = 0; |
| 2497 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2498 | next = node; |
| 2499 | while (1) { |
| 2500 | cond_resched(); |
| 2501 | next = walk_up_backref(next, edges, &index); |
| 2502 | root = next->root; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2503 | BUG_ON(!root); |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 2504 | BUG_ON(!test_bit(BTRFS_ROOT_REF_COWS, &root->state)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2505 | |
| 2506 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { |
| 2507 | record_reloc_root_in_trans(trans, root); |
| 2508 | break; |
| 2509 | } |
| 2510 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2511 | btrfs_record_root_in_trans(trans, root); |
| 2512 | root = root->reloc_root; |
| 2513 | |
| 2514 | if (next->new_bytenr != root->node->start) { |
| 2515 | BUG_ON(next->new_bytenr); |
| 2516 | BUG_ON(!list_empty(&next->list)); |
| 2517 | next->new_bytenr = root->node->start; |
| 2518 | next->root = root; |
| 2519 | list_add_tail(&next->list, |
| 2520 | &rc->backref_cache.changed); |
| 2521 | __mark_block_processed(rc, next); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2522 | break; |
| 2523 | } |
| 2524 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2525 | WARN_ON(1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2526 | root = NULL; |
| 2527 | next = walk_down_backref(edges, &index); |
| 2528 | if (!next || next->level <= node->level) |
| 2529 | break; |
| 2530 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2531 | if (!root) |
| 2532 | return NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2533 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2534 | next = node; |
| 2535 | /* setup backref node path for btrfs_reloc_cow_block */ |
| 2536 | while (1) { |
| 2537 | rc->backref_cache.path[next->level] = next; |
| 2538 | if (--index < 0) |
| 2539 | break; |
| 2540 | next = edges[index]->node[UPPER]; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2541 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2542 | return root; |
| 2543 | } |
| 2544 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2545 | /* |
| 2546 | * select a tree root for relocation. return NULL if the block |
| 2547 | * is reference counted. we should use do_relocation() in this |
| 2548 | * case. return a tree root pointer if the block isn't reference |
| 2549 | * counted. return -ENOENT if the block is root of reloc tree. |
| 2550 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2551 | static noinline_for_stack |
Zhaolei | 147d256 | 2015-08-06 20:58:11 +0800 | [diff] [blame] | 2552 | struct btrfs_root *select_one_root(struct backref_node *node) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2553 | { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2554 | struct backref_node *next; |
| 2555 | struct btrfs_root *root; |
| 2556 | struct btrfs_root *fs_root = NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2557 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2558 | int index = 0; |
| 2559 | |
| 2560 | next = node; |
| 2561 | while (1) { |
| 2562 | cond_resched(); |
| 2563 | next = walk_up_backref(next, edges, &index); |
| 2564 | root = next->root; |
| 2565 | BUG_ON(!root); |
| 2566 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2567 | /* no other choice for non-references counted tree */ |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 2568 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2569 | return root; |
| 2570 | |
| 2571 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) |
| 2572 | fs_root = root; |
| 2573 | |
| 2574 | if (next != node) |
| 2575 | return NULL; |
| 2576 | |
| 2577 | next = walk_down_backref(edges, &index); |
| 2578 | if (!next || next->level <= node->level) |
| 2579 | break; |
| 2580 | } |
| 2581 | |
| 2582 | if (!fs_root) |
| 2583 | return ERR_PTR(-ENOENT); |
| 2584 | return fs_root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2585 | } |
| 2586 | |
| 2587 | static noinline_for_stack |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2588 | u64 calcu_metadata_size(struct reloc_control *rc, |
| 2589 | struct backref_node *node, int reserve) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2590 | { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2591 | struct backref_node *next = node; |
| 2592 | struct backref_edge *edge; |
| 2593 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; |
| 2594 | u64 num_bytes = 0; |
| 2595 | int index = 0; |
| 2596 | |
| 2597 | BUG_ON(reserve && node->processed); |
| 2598 | |
| 2599 | while (next) { |
| 2600 | cond_resched(); |
| 2601 | while (1) { |
| 2602 | if (next->processed && (reserve || next != node)) |
| 2603 | break; |
| 2604 | |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 2605 | num_bytes += rc->extent_root->nodesize; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2606 | |
| 2607 | if (list_empty(&next->upper)) |
| 2608 | break; |
| 2609 | |
| 2610 | edge = list_entry(next->upper.next, |
| 2611 | struct backref_edge, list[LOWER]); |
| 2612 | edges[index++] = edge; |
| 2613 | next = edge->node[UPPER]; |
| 2614 | } |
| 2615 | next = walk_down_backref(edges, &index); |
| 2616 | } |
| 2617 | return num_bytes; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2618 | } |
| 2619 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2620 | static int reserve_metadata_space(struct btrfs_trans_handle *trans, |
| 2621 | struct reloc_control *rc, |
| 2622 | struct backref_node *node) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2623 | { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2624 | struct btrfs_root *root = rc->extent_root; |
| 2625 | u64 num_bytes; |
| 2626 | int ret; |
Wang Shilong | 0647bf5 | 2013-11-20 09:01:52 +0800 | [diff] [blame] | 2627 | u64 tmp; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2628 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2629 | num_bytes = calcu_metadata_size(rc, node, 1) * 2; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2630 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2631 | trans->block_rsv = rc->block_rsv; |
Wang Shilong | 0647bf5 | 2013-11-20 09:01:52 +0800 | [diff] [blame] | 2632 | rc->reserved_bytes += num_bytes; |
Josef Bacik | 8ca17f0 | 2016-05-27 13:24:13 -0400 | [diff] [blame] | 2633 | |
| 2634 | /* |
| 2635 | * We are under a transaction here so we can only do limited flushing. |
| 2636 | * If we get an enospc just kick back -EAGAIN so we know to drop the |
| 2637 | * transaction and try to refill when we can flush all the things. |
| 2638 | */ |
Wang Shilong | 0647bf5 | 2013-11-20 09:01:52 +0800 | [diff] [blame] | 2639 | ret = btrfs_block_rsv_refill(root, rc->block_rsv, num_bytes, |
Josef Bacik | 8ca17f0 | 2016-05-27 13:24:13 -0400 | [diff] [blame] | 2640 | BTRFS_RESERVE_FLUSH_LIMIT); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2641 | if (ret) { |
Josef Bacik | 8ca17f0 | 2016-05-27 13:24:13 -0400 | [diff] [blame] | 2642 | tmp = rc->extent_root->nodesize * RELOCATION_RESERVED_NODES; |
| 2643 | while (tmp <= rc->reserved_bytes) |
| 2644 | tmp <<= 1; |
| 2645 | /* |
| 2646 | * only one thread can access block_rsv at this point, |
| 2647 | * so we don't need hold lock to protect block_rsv. |
| 2648 | * we expand more reservation size here to allow enough |
| 2649 | * space for relocation and we will return eailer in |
| 2650 | * enospc case. |
| 2651 | */ |
| 2652 | rc->block_rsv->size = tmp + rc->extent_root->nodesize * |
| 2653 | RELOCATION_RESERVED_NODES; |
| 2654 | return -EAGAIN; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2655 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2656 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2657 | return 0; |
| 2658 | } |
| 2659 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2660 | /* |
| 2661 | * relocate a block tree, and then update pointers in upper level |
| 2662 | * blocks that reference the block to point to the new location. |
| 2663 | * |
| 2664 | * if called by link_to_upper, the block has already been relocated. |
| 2665 | * in that case this function just updates pointers. |
| 2666 | */ |
| 2667 | static int do_relocation(struct btrfs_trans_handle *trans, |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2668 | struct reloc_control *rc, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2669 | struct backref_node *node, |
| 2670 | struct btrfs_key *key, |
| 2671 | struct btrfs_path *path, int lowest) |
| 2672 | { |
| 2673 | struct backref_node *upper; |
| 2674 | struct backref_edge *edge; |
| 2675 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; |
| 2676 | struct btrfs_root *root; |
| 2677 | struct extent_buffer *eb; |
| 2678 | u32 blocksize; |
| 2679 | u64 bytenr; |
| 2680 | u64 generation; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2681 | int slot; |
| 2682 | int ret; |
| 2683 | int err = 0; |
| 2684 | |
| 2685 | BUG_ON(lowest && node->eb); |
| 2686 | |
| 2687 | path->lowest_level = node->level + 1; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2688 | rc->backref_cache.path[node->level] = node; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2689 | list_for_each_entry(edge, &node->upper, list[LOWER]) { |
| 2690 | cond_resched(); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2691 | |
| 2692 | upper = edge->node[UPPER]; |
Wang Shilong | dc4103f | 2013-12-26 13:10:49 +0800 | [diff] [blame] | 2693 | root = select_reloc_root(trans, rc, upper, edges); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2694 | BUG_ON(!root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2695 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2696 | if (upper->eb && !upper->locked) { |
| 2697 | if (!lowest) { |
| 2698 | ret = btrfs_bin_search(upper->eb, key, |
| 2699 | upper->level, &slot); |
| 2700 | BUG_ON(ret); |
| 2701 | bytenr = btrfs_node_blockptr(upper->eb, slot); |
| 2702 | if (node->eb->start == bytenr) |
| 2703 | goto next; |
| 2704 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2705 | drop_node_buffer(upper); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2706 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2707 | |
| 2708 | if (!upper->eb) { |
| 2709 | ret = btrfs_search_slot(trans, root, key, path, 0, 1); |
Liu Bo | 3561b9d | 2016-09-14 08:51:46 -0700 | [diff] [blame] | 2710 | if (ret) { |
| 2711 | if (ret < 0) |
| 2712 | err = ret; |
| 2713 | else |
| 2714 | err = -ENOENT; |
| 2715 | |
| 2716 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2717 | break; |
| 2718 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2719 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2720 | if (!upper->eb) { |
| 2721 | upper->eb = path->nodes[upper->level]; |
| 2722 | path->nodes[upper->level] = NULL; |
| 2723 | } else { |
| 2724 | BUG_ON(upper->eb != path->nodes[upper->level]); |
| 2725 | } |
| 2726 | |
| 2727 | upper->locked = 1; |
| 2728 | path->locks[upper->level] = 0; |
| 2729 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2730 | slot = path->slots[upper->level]; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2731 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2732 | } else { |
| 2733 | ret = btrfs_bin_search(upper->eb, key, upper->level, |
| 2734 | &slot); |
| 2735 | BUG_ON(ret); |
| 2736 | } |
| 2737 | |
| 2738 | bytenr = btrfs_node_blockptr(upper->eb, slot); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2739 | if (lowest) { |
Liu Bo | 4547f4d | 2016-09-23 14:05:04 -0700 | [diff] [blame] | 2740 | if (bytenr != node->bytenr) { |
| 2741 | btrfs_err(root->fs_info, |
| 2742 | "lowest leaf/node mismatch: bytenr %llu node->bytenr %llu slot %d upper %llu", |
| 2743 | bytenr, node->bytenr, slot, |
| 2744 | upper->eb->start); |
| 2745 | err = -EIO; |
| 2746 | goto next; |
| 2747 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2748 | } else { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2749 | if (node->eb->start == bytenr) |
| 2750 | goto next; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2751 | } |
| 2752 | |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 2753 | blocksize = root->nodesize; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2754 | generation = btrfs_node_ptr_generation(upper->eb, slot); |
David Sterba | ce86cd5 | 2014-06-15 01:07:32 +0200 | [diff] [blame] | 2755 | eb = read_tree_block(root, bytenr, generation); |
Liu Bo | 64c043d | 2015-05-25 17:30:15 +0800 | [diff] [blame] | 2756 | if (IS_ERR(eb)) { |
| 2757 | err = PTR_ERR(eb); |
| 2758 | goto next; |
| 2759 | } else if (!extent_buffer_uptodate(eb)) { |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 2760 | free_extent_buffer(eb); |
Tsutomu Itoh | 97d9a8a | 2011-03-24 06:33:21 +0000 | [diff] [blame] | 2761 | err = -EIO; |
| 2762 | goto next; |
| 2763 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2764 | btrfs_tree_lock(eb); |
| 2765 | btrfs_set_lock_blocking(eb); |
| 2766 | |
| 2767 | if (!node->eb) { |
| 2768 | ret = btrfs_cow_block(trans, root, eb, upper->eb, |
| 2769 | slot, &eb); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2770 | btrfs_tree_unlock(eb); |
| 2771 | free_extent_buffer(eb); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2772 | if (ret < 0) { |
| 2773 | err = ret; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2774 | goto next; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2775 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2776 | BUG_ON(node->eb != eb); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2777 | } else { |
| 2778 | btrfs_set_node_blockptr(upper->eb, slot, |
| 2779 | node->eb->start); |
| 2780 | btrfs_set_node_ptr_generation(upper->eb, slot, |
| 2781 | trans->transid); |
| 2782 | btrfs_mark_buffer_dirty(upper->eb); |
| 2783 | |
| 2784 | ret = btrfs_inc_extent_ref(trans, root, |
| 2785 | node->eb->start, blocksize, |
| 2786 | upper->eb->start, |
| 2787 | btrfs_header_owner(upper->eb), |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 2788 | node->level, 0); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2789 | BUG_ON(ret); |
| 2790 | |
| 2791 | ret = btrfs_drop_subtree(trans, root, eb, upper->eb); |
| 2792 | BUG_ON(ret); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2793 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2794 | next: |
| 2795 | if (!upper->pending) |
| 2796 | drop_node_buffer(upper); |
| 2797 | else |
| 2798 | unlock_node_buffer(upper); |
| 2799 | if (err) |
| 2800 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2801 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2802 | |
| 2803 | if (!err && node->pending) { |
| 2804 | drop_node_buffer(node); |
| 2805 | list_move_tail(&node->list, &rc->backref_cache.changed); |
| 2806 | node->pending = 0; |
| 2807 | } |
| 2808 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2809 | path->lowest_level = 0; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2810 | BUG_ON(err == -ENOSPC); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2811 | return err; |
| 2812 | } |
| 2813 | |
| 2814 | static int link_to_upper(struct btrfs_trans_handle *trans, |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2815 | struct reloc_control *rc, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2816 | struct backref_node *node, |
| 2817 | struct btrfs_path *path) |
| 2818 | { |
| 2819 | struct btrfs_key key; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2820 | |
| 2821 | btrfs_node_key_to_cpu(node->eb, &key, 0); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2822 | return do_relocation(trans, rc, node, &key, path, 0); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2823 | } |
| 2824 | |
| 2825 | static int finish_pending_nodes(struct btrfs_trans_handle *trans, |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2826 | struct reloc_control *rc, |
| 2827 | struct btrfs_path *path, int err) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2828 | { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2829 | LIST_HEAD(list); |
| 2830 | struct backref_cache *cache = &rc->backref_cache; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2831 | struct backref_node *node; |
| 2832 | int level; |
| 2833 | int ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2834 | |
| 2835 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { |
| 2836 | while (!list_empty(&cache->pending[level])) { |
| 2837 | node = list_entry(cache->pending[level].next, |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2838 | struct backref_node, list); |
| 2839 | list_move_tail(&node->list, &list); |
| 2840 | BUG_ON(!node->pending); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2841 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2842 | if (!err) { |
| 2843 | ret = link_to_upper(trans, rc, node, path); |
| 2844 | if (ret < 0) |
| 2845 | err = ret; |
| 2846 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2847 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2848 | list_splice_init(&list, &cache->pending[level]); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2849 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2850 | return err; |
| 2851 | } |
| 2852 | |
| 2853 | static void mark_block_processed(struct reloc_control *rc, |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2854 | u64 bytenr, u32 blocksize) |
| 2855 | { |
| 2856 | set_extent_bits(&rc->processed_blocks, bytenr, bytenr + blocksize - 1, |
David Sterba | ceeb0ae | 2016-04-26 23:54:39 +0200 | [diff] [blame] | 2857 | EXTENT_DIRTY); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2858 | } |
| 2859 | |
| 2860 | static void __mark_block_processed(struct reloc_control *rc, |
| 2861 | struct backref_node *node) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2862 | { |
| 2863 | u32 blocksize; |
| 2864 | if (node->level == 0 || |
| 2865 | in_block_group(node->bytenr, rc->block_group)) { |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 2866 | blocksize = rc->extent_root->nodesize; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2867 | mark_block_processed(rc, node->bytenr, blocksize); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2868 | } |
| 2869 | node->processed = 1; |
| 2870 | } |
| 2871 | |
| 2872 | /* |
| 2873 | * mark a block and all blocks directly/indirectly reference the block |
| 2874 | * as processed. |
| 2875 | */ |
| 2876 | static void update_processed_blocks(struct reloc_control *rc, |
| 2877 | struct backref_node *node) |
| 2878 | { |
| 2879 | struct backref_node *next = node; |
| 2880 | struct backref_edge *edge; |
| 2881 | struct backref_edge *edges[BTRFS_MAX_LEVEL - 1]; |
| 2882 | int index = 0; |
| 2883 | |
| 2884 | while (next) { |
| 2885 | cond_resched(); |
| 2886 | while (1) { |
| 2887 | if (next->processed) |
| 2888 | break; |
| 2889 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2890 | __mark_block_processed(rc, next); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2891 | |
| 2892 | if (list_empty(&next->upper)) |
| 2893 | break; |
| 2894 | |
| 2895 | edge = list_entry(next->upper.next, |
| 2896 | struct backref_edge, list[LOWER]); |
| 2897 | edges[index++] = edge; |
| 2898 | next = edge->node[UPPER]; |
| 2899 | } |
| 2900 | next = walk_down_backref(edges, &index); |
| 2901 | } |
| 2902 | } |
| 2903 | |
David Sterba | 7476dfd | 2014-06-15 03:34:59 +0200 | [diff] [blame] | 2904 | static int tree_block_processed(u64 bytenr, struct reloc_control *rc) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2905 | { |
David Sterba | 7476dfd | 2014-06-15 03:34:59 +0200 | [diff] [blame] | 2906 | u32 blocksize = rc->extent_root->nodesize; |
| 2907 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2908 | if (test_range_bit(&rc->processed_blocks, bytenr, |
Chris Mason | 9655d29 | 2009-09-02 15:22:30 -0400 | [diff] [blame] | 2909 | bytenr + blocksize - 1, EXTENT_DIRTY, 1, NULL)) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2910 | return 1; |
| 2911 | return 0; |
| 2912 | } |
| 2913 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2914 | static int get_tree_block_key(struct reloc_control *rc, |
| 2915 | struct tree_block *block) |
| 2916 | { |
| 2917 | struct extent_buffer *eb; |
| 2918 | |
| 2919 | BUG_ON(block->key_ready); |
| 2920 | eb = read_tree_block(rc->extent_root, block->bytenr, |
David Sterba | ce86cd5 | 2014-06-15 01:07:32 +0200 | [diff] [blame] | 2921 | block->key.offset); |
Liu Bo | 64c043d | 2015-05-25 17:30:15 +0800 | [diff] [blame] | 2922 | if (IS_ERR(eb)) { |
| 2923 | return PTR_ERR(eb); |
| 2924 | } else if (!extent_buffer_uptodate(eb)) { |
Josef Bacik | 416bc65 | 2013-04-23 14:17:42 -0400 | [diff] [blame] | 2925 | free_extent_buffer(eb); |
| 2926 | return -EIO; |
| 2927 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2928 | WARN_ON(btrfs_header_level(eb) != block->level); |
| 2929 | if (block->level == 0) |
| 2930 | btrfs_item_key_to_cpu(eb, &block->key, 0); |
| 2931 | else |
| 2932 | btrfs_node_key_to_cpu(eb, &block->key, 0); |
| 2933 | free_extent_buffer(eb); |
| 2934 | block->key_ready = 1; |
| 2935 | return 0; |
| 2936 | } |
| 2937 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2938 | /* |
| 2939 | * helper function to relocate a tree block |
| 2940 | */ |
| 2941 | static int relocate_tree_block(struct btrfs_trans_handle *trans, |
| 2942 | struct reloc_control *rc, |
| 2943 | struct backref_node *node, |
| 2944 | struct btrfs_key *key, |
| 2945 | struct btrfs_path *path) |
| 2946 | { |
| 2947 | struct btrfs_root *root; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2948 | int ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2949 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2950 | if (!node) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2951 | return 0; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2952 | |
| 2953 | BUG_ON(node->processed); |
Zhaolei | 147d256 | 2015-08-06 20:58:11 +0800 | [diff] [blame] | 2954 | root = select_one_root(node); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2955 | if (root == ERR_PTR(-ENOENT)) { |
| 2956 | update_processed_blocks(rc, node); |
| 2957 | goto out; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2958 | } |
| 2959 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 2960 | if (!root || test_bit(BTRFS_ROOT_REF_COWS, &root->state)) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2961 | ret = reserve_metadata_space(trans, rc, node); |
| 2962 | if (ret) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2963 | goto out; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2964 | } |
| 2965 | |
| 2966 | if (root) { |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 2967 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2968 | BUG_ON(node->new_bytenr); |
| 2969 | BUG_ON(!list_empty(&node->list)); |
| 2970 | btrfs_record_root_in_trans(trans, root); |
| 2971 | root = root->reloc_root; |
| 2972 | node->new_bytenr = root->node->start; |
| 2973 | node->root = root; |
| 2974 | list_add_tail(&node->list, &rc->backref_cache.changed); |
| 2975 | } else { |
| 2976 | path->lowest_level = node->level; |
| 2977 | ret = btrfs_search_slot(trans, root, key, path, 0, 1); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2978 | btrfs_release_path(path); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2979 | if (ret > 0) |
| 2980 | ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2981 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2982 | if (!ret) |
| 2983 | update_processed_blocks(rc, node); |
| 2984 | } else { |
| 2985 | ret = do_relocation(trans, rc, node, key, path, 1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2986 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2987 | out: |
Wang Shilong | 0647bf5 | 2013-11-20 09:01:52 +0800 | [diff] [blame] | 2988 | if (ret || node->level == 0 || node->cowonly) |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2989 | remove_backref_node(&rc->backref_cache, node); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2990 | return ret; |
| 2991 | } |
| 2992 | |
| 2993 | /* |
| 2994 | * relocate a list of blocks |
| 2995 | */ |
| 2996 | static noinline_for_stack |
| 2997 | int relocate_tree_blocks(struct btrfs_trans_handle *trans, |
| 2998 | struct reloc_control *rc, struct rb_root *blocks) |
| 2999 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3000 | struct backref_node *node; |
| 3001 | struct btrfs_path *path; |
| 3002 | struct tree_block *block; |
| 3003 | struct rb_node *rb_node; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3004 | int ret; |
| 3005 | int err = 0; |
| 3006 | |
| 3007 | path = btrfs_alloc_path(); |
Liu Bo | e1a1267 | 2013-03-04 16:25:38 +0000 | [diff] [blame] | 3008 | if (!path) { |
| 3009 | err = -ENOMEM; |
David Sterba | 34c2b29 | 2013-04-26 12:56:04 +0000 | [diff] [blame] | 3010 | goto out_free_blocks; |
Liu Bo | e1a1267 | 2013-03-04 16:25:38 +0000 | [diff] [blame] | 3011 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3012 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3013 | rb_node = rb_first(blocks); |
| 3014 | while (rb_node) { |
| 3015 | block = rb_entry(rb_node, struct tree_block, rb_node); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3016 | if (!block->key_ready) |
David Sterba | d3e46fe | 2014-06-15 02:04:19 +0200 | [diff] [blame] | 3017 | readahead_tree_block(rc->extent_root, block->bytenr); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3018 | rb_node = rb_next(rb_node); |
| 3019 | } |
| 3020 | |
| 3021 | rb_node = rb_first(blocks); |
| 3022 | while (rb_node) { |
| 3023 | block = rb_entry(rb_node, struct tree_block, rb_node); |
David Sterba | 34c2b29 | 2013-04-26 12:56:04 +0000 | [diff] [blame] | 3024 | if (!block->key_ready) { |
| 3025 | err = get_tree_block_key(rc, block); |
| 3026 | if (err) |
| 3027 | goto out_free_path; |
| 3028 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3029 | rb_node = rb_next(rb_node); |
| 3030 | } |
| 3031 | |
| 3032 | rb_node = rb_first(blocks); |
| 3033 | while (rb_node) { |
| 3034 | block = rb_entry(rb_node, struct tree_block, rb_node); |
| 3035 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3036 | node = build_backref_tree(rc, &block->key, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3037 | block->level, block->bytenr); |
| 3038 | if (IS_ERR(node)) { |
| 3039 | err = PTR_ERR(node); |
| 3040 | goto out; |
| 3041 | } |
| 3042 | |
| 3043 | ret = relocate_tree_block(trans, rc, node, &block->key, |
| 3044 | path); |
| 3045 | if (ret < 0) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3046 | if (ret != -EAGAIN || rb_node == rb_first(blocks)) |
| 3047 | err = ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3048 | goto out; |
| 3049 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3050 | rb_node = rb_next(rb_node); |
| 3051 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3052 | out: |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3053 | err = finish_pending_nodes(trans, rc, path, err); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3054 | |
David Sterba | 34c2b29 | 2013-04-26 12:56:04 +0000 | [diff] [blame] | 3055 | out_free_path: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3056 | btrfs_free_path(path); |
David Sterba | 34c2b29 | 2013-04-26 12:56:04 +0000 | [diff] [blame] | 3057 | out_free_blocks: |
Liu Bo | e1a1267 | 2013-03-04 16:25:38 +0000 | [diff] [blame] | 3058 | free_block_list(blocks); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3059 | return err; |
| 3060 | } |
| 3061 | |
| 3062 | static noinline_for_stack |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3063 | int prealloc_file_extent_cluster(struct inode *inode, |
| 3064 | struct file_extent_cluster *cluster) |
| 3065 | { |
| 3066 | u64 alloc_hint = 0; |
| 3067 | u64 start; |
| 3068 | u64 end; |
| 3069 | u64 offset = BTRFS_I(inode)->index_cnt; |
| 3070 | u64 num_bytes; |
| 3071 | int nr = 0; |
| 3072 | int ret = 0; |
Wang Xiaoguang | dcb40c1 | 2016-07-25 15:51:38 +0800 | [diff] [blame] | 3073 | u64 prealloc_start = cluster->start - offset; |
| 3074 | u64 prealloc_end = cluster->end - offset; |
Wang Xiaoguang | 1851309 | 2016-07-25 15:51:40 +0800 | [diff] [blame] | 3075 | u64 cur_offset; |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3076 | |
| 3077 | BUG_ON(cluster->start != cluster->boundary[0]); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 3078 | inode_lock(inode); |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3079 | |
Wang Xiaoguang | dcb40c1 | 2016-07-25 15:51:38 +0800 | [diff] [blame] | 3080 | ret = btrfs_check_data_free_space(inode, prealloc_start, |
| 3081 | prealloc_end + 1 - prealloc_start); |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3082 | if (ret) |
| 3083 | goto out; |
| 3084 | |
Wang Xiaoguang | 1851309 | 2016-07-25 15:51:40 +0800 | [diff] [blame] | 3085 | cur_offset = prealloc_start; |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3086 | while (nr < cluster->nr) { |
| 3087 | start = cluster->boundary[nr] - offset; |
| 3088 | if (nr + 1 < cluster->nr) |
| 3089 | end = cluster->boundary[nr + 1] - 1 - offset; |
| 3090 | else |
| 3091 | end = cluster->end - offset; |
| 3092 | |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 3093 | lock_extent(&BTRFS_I(inode)->io_tree, start, end); |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3094 | num_bytes = end + 1 - start; |
Wang Xiaoguang | 1851309 | 2016-07-25 15:51:40 +0800 | [diff] [blame] | 3095 | if (cur_offset < start) |
| 3096 | btrfs_free_reserved_data_space(inode, cur_offset, |
| 3097 | start - cur_offset); |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3098 | ret = btrfs_prealloc_file_range(inode, 0, start, |
| 3099 | num_bytes, num_bytes, |
| 3100 | end + 1, &alloc_hint); |
Wang Xiaoguang | 1851309 | 2016-07-25 15:51:40 +0800 | [diff] [blame] | 3101 | cur_offset = end + 1; |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 3102 | unlock_extent(&BTRFS_I(inode)->io_tree, start, end); |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3103 | if (ret) |
| 3104 | break; |
| 3105 | nr++; |
| 3106 | } |
Wang Xiaoguang | 1851309 | 2016-07-25 15:51:40 +0800 | [diff] [blame] | 3107 | if (cur_offset < prealloc_end) |
| 3108 | btrfs_free_reserved_data_space(inode, cur_offset, |
| 3109 | prealloc_end + 1 - cur_offset); |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3110 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 3111 | inode_unlock(inode); |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3112 | return ret; |
| 3113 | } |
| 3114 | |
| 3115 | static noinline_for_stack |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3116 | int setup_extent_mapping(struct inode *inode, u64 start, u64 end, |
| 3117 | u64 block_start) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3118 | { |
| 3119 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3120 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 3121 | struct extent_map *em; |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3122 | int ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3123 | |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 3124 | em = alloc_extent_map(); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3125 | if (!em) |
| 3126 | return -ENOMEM; |
| 3127 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3128 | em->start = start; |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3129 | em->len = end + 1 - start; |
| 3130 | em->block_len = em->len; |
| 3131 | em->block_start = block_start; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3132 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
| 3133 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
| 3134 | |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 3135 | lock_extent(&BTRFS_I(inode)->io_tree, start, end); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3136 | while (1) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 3137 | write_lock(&em_tree->lock); |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 3138 | ret = add_extent_mapping(em_tree, em, 0); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 3139 | write_unlock(&em_tree->lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3140 | if (ret != -EEXIST) { |
| 3141 | free_extent_map(em); |
| 3142 | break; |
| 3143 | } |
| 3144 | btrfs_drop_extent_cache(inode, start, end, 0); |
| 3145 | } |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 3146 | unlock_extent(&BTRFS_I(inode)->io_tree, start, end); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3147 | return ret; |
| 3148 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3149 | |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3150 | static int relocate_file_extent_cluster(struct inode *inode, |
| 3151 | struct file_extent_cluster *cluster) |
| 3152 | { |
| 3153 | u64 page_start; |
| 3154 | u64 page_end; |
| 3155 | u64 offset = BTRFS_I(inode)->index_cnt; |
| 3156 | unsigned long index; |
| 3157 | unsigned long last_index; |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3158 | struct page *page; |
| 3159 | struct file_ra_state *ra; |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 3160 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3161 | int nr = 0; |
| 3162 | int ret = 0; |
| 3163 | |
| 3164 | if (!cluster->nr) |
| 3165 | return 0; |
| 3166 | |
| 3167 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
| 3168 | if (!ra) |
| 3169 | return -ENOMEM; |
| 3170 | |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3171 | ret = prealloc_file_extent_cluster(inode, cluster); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3172 | if (ret) |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3173 | goto out; |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3174 | |
| 3175 | file_ra_state_init(ra, inode->i_mapping); |
| 3176 | |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3177 | ret = setup_extent_mapping(inode, cluster->start - offset, |
| 3178 | cluster->end - offset, cluster->start); |
| 3179 | if (ret) |
| 3180 | goto out; |
| 3181 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3182 | index = (cluster->start - offset) >> PAGE_SHIFT; |
| 3183 | last_index = (cluster->end - offset) >> PAGE_SHIFT; |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3184 | while (index <= last_index) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3185 | ret = btrfs_delalloc_reserve_metadata(inode, PAGE_SIZE); |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3186 | if (ret) |
| 3187 | goto out; |
| 3188 | |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3189 | page = find_lock_page(inode->i_mapping, index); |
| 3190 | if (!page) { |
| 3191 | page_cache_sync_readahead(inode->i_mapping, |
| 3192 | ra, NULL, index, |
| 3193 | last_index + 1 - index); |
Josef Bacik | a94733d | 2011-07-11 10:47:06 -0400 | [diff] [blame] | 3194 | page = find_or_create_page(inode->i_mapping, index, |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 3195 | mask); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3196 | if (!page) { |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3197 | btrfs_delalloc_release_metadata(inode, |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3198 | PAGE_SIZE); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3199 | ret = -ENOMEM; |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3200 | goto out; |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3201 | } |
| 3202 | } |
| 3203 | |
| 3204 | if (PageReadahead(page)) { |
| 3205 | page_cache_async_readahead(inode->i_mapping, |
| 3206 | ra, NULL, page, index, |
| 3207 | last_index + 1 - index); |
| 3208 | } |
| 3209 | |
| 3210 | if (!PageUptodate(page)) { |
| 3211 | btrfs_readpage(NULL, page); |
| 3212 | lock_page(page); |
| 3213 | if (!PageUptodate(page)) { |
| 3214 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3215 | put_page(page); |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3216 | btrfs_delalloc_release_metadata(inode, |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3217 | PAGE_SIZE); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3218 | ret = -EIO; |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3219 | goto out; |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3220 | } |
| 3221 | } |
| 3222 | |
Miao Xie | 4eee4fa | 2012-12-21 09:17:45 +0000 | [diff] [blame] | 3223 | page_start = page_offset(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3224 | page_end = page_start + PAGE_SIZE - 1; |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3225 | |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 3226 | lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3227 | |
| 3228 | set_page_extent_mapped(page); |
| 3229 | |
| 3230 | if (nr < cluster->nr && |
| 3231 | page_start + offset == cluster->boundary[nr]) { |
| 3232 | set_extent_bits(&BTRFS_I(inode)->io_tree, |
| 3233 | page_start, page_end, |
David Sterba | ceeb0ae | 2016-04-26 23:54:39 +0200 | [diff] [blame] | 3234 | EXTENT_BOUNDARY); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3235 | nr++; |
| 3236 | } |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3237 | |
Qu Wenruo | ba8b04c | 2016-07-19 16:50:36 +0800 | [diff] [blame] | 3238 | btrfs_set_extent_delalloc(inode, page_start, page_end, NULL, 0); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3239 | set_page_dirty(page); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3240 | |
| 3241 | unlock_extent(&BTRFS_I(inode)->io_tree, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 3242 | page_start, page_end); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3243 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 3244 | put_page(page); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3245 | |
| 3246 | index++; |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3247 | balance_dirty_pages_ratelimited(inode->i_mapping); |
| 3248 | btrfs_throttle(BTRFS_I(inode)->root); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3249 | } |
| 3250 | WARN_ON(nr != cluster->nr); |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3251 | out: |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 3252 | kfree(ra); |
| 3253 | return ret; |
| 3254 | } |
| 3255 | |
| 3256 | static noinline_for_stack |
| 3257 | int relocate_data_extent(struct inode *inode, struct btrfs_key *extent_key, |
| 3258 | struct file_extent_cluster *cluster) |
| 3259 | { |
| 3260 | int ret; |
| 3261 | |
| 3262 | if (cluster->nr > 0 && extent_key->objectid != cluster->end + 1) { |
| 3263 | ret = relocate_file_extent_cluster(inode, cluster); |
| 3264 | if (ret) |
| 3265 | return ret; |
| 3266 | cluster->nr = 0; |
| 3267 | } |
| 3268 | |
| 3269 | if (!cluster->nr) |
| 3270 | cluster->start = extent_key->objectid; |
| 3271 | else |
| 3272 | BUG_ON(cluster->nr >= MAX_EXTENTS); |
| 3273 | cluster->end = extent_key->objectid + extent_key->offset - 1; |
| 3274 | cluster->boundary[cluster->nr] = extent_key->objectid; |
| 3275 | cluster->nr++; |
| 3276 | |
| 3277 | if (cluster->nr >= MAX_EXTENTS) { |
| 3278 | ret = relocate_file_extent_cluster(inode, cluster); |
| 3279 | if (ret) |
| 3280 | return ret; |
| 3281 | cluster->nr = 0; |
| 3282 | } |
| 3283 | return 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3284 | } |
| 3285 | |
| 3286 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 3287 | static int get_ref_objectid_v0(struct reloc_control *rc, |
| 3288 | struct btrfs_path *path, |
| 3289 | struct btrfs_key *extent_key, |
| 3290 | u64 *ref_objectid, int *path_change) |
| 3291 | { |
| 3292 | struct btrfs_key key; |
| 3293 | struct extent_buffer *leaf; |
| 3294 | struct btrfs_extent_ref_v0 *ref0; |
| 3295 | int ret; |
| 3296 | int slot; |
| 3297 | |
| 3298 | leaf = path->nodes[0]; |
| 3299 | slot = path->slots[0]; |
| 3300 | while (1) { |
| 3301 | if (slot >= btrfs_header_nritems(leaf)) { |
| 3302 | ret = btrfs_next_leaf(rc->extent_root, path); |
| 3303 | if (ret < 0) |
| 3304 | return ret; |
| 3305 | BUG_ON(ret > 0); |
| 3306 | leaf = path->nodes[0]; |
| 3307 | slot = path->slots[0]; |
| 3308 | if (path_change) |
| 3309 | *path_change = 1; |
| 3310 | } |
| 3311 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 3312 | if (key.objectid != extent_key->objectid) |
| 3313 | return -ENOENT; |
| 3314 | |
| 3315 | if (key.type != BTRFS_EXTENT_REF_V0_KEY) { |
| 3316 | slot++; |
| 3317 | continue; |
| 3318 | } |
| 3319 | ref0 = btrfs_item_ptr(leaf, slot, |
| 3320 | struct btrfs_extent_ref_v0); |
| 3321 | *ref_objectid = btrfs_ref_objectid_v0(leaf, ref0); |
| 3322 | break; |
| 3323 | } |
| 3324 | return 0; |
| 3325 | } |
| 3326 | #endif |
| 3327 | |
| 3328 | /* |
| 3329 | * helper to add a tree block to the list. |
| 3330 | * the major work is getting the generation and level of the block |
| 3331 | */ |
| 3332 | static int add_tree_block(struct reloc_control *rc, |
| 3333 | struct btrfs_key *extent_key, |
| 3334 | struct btrfs_path *path, |
| 3335 | struct rb_root *blocks) |
| 3336 | { |
| 3337 | struct extent_buffer *eb; |
| 3338 | struct btrfs_extent_item *ei; |
| 3339 | struct btrfs_tree_block_info *bi; |
| 3340 | struct tree_block *block; |
| 3341 | struct rb_node *rb_node; |
| 3342 | u32 item_size; |
| 3343 | int level = -1; |
Wang Shilong | 7fdf4b6 | 2013-10-25 18:52:08 +0800 | [diff] [blame] | 3344 | u64 generation; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3345 | |
| 3346 | eb = path->nodes[0]; |
| 3347 | item_size = btrfs_item_size_nr(eb, path->slots[0]); |
| 3348 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3349 | if (extent_key->type == BTRFS_METADATA_ITEM_KEY || |
| 3350 | item_size >= sizeof(*ei) + sizeof(*bi)) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3351 | ei = btrfs_item_ptr(eb, path->slots[0], |
| 3352 | struct btrfs_extent_item); |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3353 | if (extent_key->type == BTRFS_EXTENT_ITEM_KEY) { |
| 3354 | bi = (struct btrfs_tree_block_info *)(ei + 1); |
| 3355 | level = btrfs_tree_block_level(eb, bi); |
| 3356 | } else { |
| 3357 | level = (int)extent_key->offset; |
| 3358 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3359 | generation = btrfs_extent_generation(eb, ei); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3360 | } else { |
| 3361 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 3362 | u64 ref_owner; |
| 3363 | int ret; |
| 3364 | |
| 3365 | BUG_ON(item_size != sizeof(struct btrfs_extent_item_v0)); |
| 3366 | ret = get_ref_objectid_v0(rc, path, extent_key, |
| 3367 | &ref_owner, NULL); |
Andi Kleen | 411fc6b | 2010-10-29 15:14:31 -0400 | [diff] [blame] | 3368 | if (ret < 0) |
| 3369 | return ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3370 | BUG_ON(ref_owner >= BTRFS_MAX_LEVEL); |
| 3371 | level = (int)ref_owner; |
| 3372 | /* FIXME: get real generation */ |
| 3373 | generation = 0; |
| 3374 | #else |
| 3375 | BUG(); |
| 3376 | #endif |
| 3377 | } |
| 3378 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3379 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3380 | |
| 3381 | BUG_ON(level == -1); |
| 3382 | |
| 3383 | block = kmalloc(sizeof(*block), GFP_NOFS); |
| 3384 | if (!block) |
| 3385 | return -ENOMEM; |
| 3386 | |
| 3387 | block->bytenr = extent_key->objectid; |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 3388 | block->key.objectid = rc->extent_root->nodesize; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3389 | block->key.offset = generation; |
| 3390 | block->level = level; |
| 3391 | block->key_ready = 0; |
| 3392 | |
| 3393 | rb_node = tree_insert(blocks, block->bytenr, &block->rb_node); |
Jeff Mahoney | 43c04fb | 2011-10-03 23:22:33 -0400 | [diff] [blame] | 3394 | if (rb_node) |
| 3395 | backref_tree_panic(rb_node, -EEXIST, block->bytenr); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3396 | |
| 3397 | return 0; |
| 3398 | } |
| 3399 | |
| 3400 | /* |
| 3401 | * helper to add tree blocks for backref of type BTRFS_SHARED_DATA_REF_KEY |
| 3402 | */ |
| 3403 | static int __add_tree_block(struct reloc_control *rc, |
| 3404 | u64 bytenr, u32 blocksize, |
| 3405 | struct rb_root *blocks) |
| 3406 | { |
| 3407 | struct btrfs_path *path; |
| 3408 | struct btrfs_key key; |
| 3409 | int ret; |
Josef Bacik | aee68ee | 2013-06-13 13:50:23 -0400 | [diff] [blame] | 3410 | bool skinny = btrfs_fs_incompat(rc->extent_root->fs_info, |
| 3411 | SKINNY_METADATA); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3412 | |
David Sterba | 7476dfd | 2014-06-15 03:34:59 +0200 | [diff] [blame] | 3413 | if (tree_block_processed(bytenr, rc)) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3414 | return 0; |
| 3415 | |
| 3416 | if (tree_search(blocks, bytenr)) |
| 3417 | return 0; |
| 3418 | |
| 3419 | path = btrfs_alloc_path(); |
| 3420 | if (!path) |
| 3421 | return -ENOMEM; |
Josef Bacik | aee68ee | 2013-06-13 13:50:23 -0400 | [diff] [blame] | 3422 | again: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3423 | key.objectid = bytenr; |
Josef Bacik | aee68ee | 2013-06-13 13:50:23 -0400 | [diff] [blame] | 3424 | if (skinny) { |
| 3425 | key.type = BTRFS_METADATA_ITEM_KEY; |
| 3426 | key.offset = (u64)-1; |
| 3427 | } else { |
| 3428 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 3429 | key.offset = blocksize; |
| 3430 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3431 | |
| 3432 | path->search_commit_root = 1; |
| 3433 | path->skip_locking = 1; |
| 3434 | ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, 0, 0); |
| 3435 | if (ret < 0) |
| 3436 | goto out; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3437 | |
Josef Bacik | aee68ee | 2013-06-13 13:50:23 -0400 | [diff] [blame] | 3438 | if (ret > 0 && skinny) { |
| 3439 | if (path->slots[0]) { |
| 3440 | path->slots[0]--; |
| 3441 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 3442 | path->slots[0]); |
| 3443 | if (key.objectid == bytenr && |
| 3444 | (key.type == BTRFS_METADATA_ITEM_KEY || |
| 3445 | (key.type == BTRFS_EXTENT_ITEM_KEY && |
| 3446 | key.offset == blocksize))) |
| 3447 | ret = 0; |
| 3448 | } |
| 3449 | |
| 3450 | if (ret) { |
| 3451 | skinny = false; |
| 3452 | btrfs_release_path(path); |
| 3453 | goto again; |
| 3454 | } |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3455 | } |
| 3456 | BUG_ON(ret); |
| 3457 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3458 | ret = add_tree_block(rc, &key, path, blocks); |
| 3459 | out: |
| 3460 | btrfs_free_path(path); |
| 3461 | return ret; |
| 3462 | } |
| 3463 | |
| 3464 | /* |
| 3465 | * helper to check if the block use full backrefs for pointers in it |
| 3466 | */ |
| 3467 | static int block_use_full_backref(struct reloc_control *rc, |
| 3468 | struct extent_buffer *eb) |
| 3469 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3470 | u64 flags; |
| 3471 | int ret; |
| 3472 | |
| 3473 | if (btrfs_header_flag(eb, BTRFS_HEADER_FLAG_RELOC) || |
| 3474 | btrfs_header_backref_rev(eb) < BTRFS_MIXED_BACKREF_REV) |
| 3475 | return 1; |
| 3476 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3477 | ret = btrfs_lookup_extent_info(NULL, rc->extent_root, |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3478 | eb->start, btrfs_header_level(eb), 1, |
| 3479 | NULL, &flags); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3480 | BUG_ON(ret); |
| 3481 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3482 | if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
| 3483 | ret = 1; |
| 3484 | else |
| 3485 | ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3486 | return ret; |
| 3487 | } |
| 3488 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3489 | static int delete_block_group_cache(struct btrfs_fs_info *fs_info, |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 3490 | struct btrfs_block_group_cache *block_group, |
| 3491 | struct inode *inode, |
| 3492 | u64 ino) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3493 | { |
| 3494 | struct btrfs_key key; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3495 | struct btrfs_root *root = fs_info->tree_root; |
| 3496 | struct btrfs_trans_handle *trans; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3497 | int ret = 0; |
| 3498 | |
| 3499 | if (inode) |
| 3500 | goto truncate; |
| 3501 | |
| 3502 | key.objectid = ino; |
| 3503 | key.type = BTRFS_INODE_ITEM_KEY; |
| 3504 | key.offset = 0; |
| 3505 | |
| 3506 | inode = btrfs_iget(fs_info->sb, &key, root, NULL); |
Tsutomu Itoh | f54fb85 | 2012-09-06 03:08:59 -0600 | [diff] [blame] | 3507 | if (IS_ERR(inode) || is_bad_inode(inode)) { |
| 3508 | if (!IS_ERR(inode)) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3509 | iput(inode); |
| 3510 | return -ENOENT; |
| 3511 | } |
| 3512 | |
| 3513 | truncate: |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 3514 | ret = btrfs_check_trunc_cache_free_space(root, |
| 3515 | &fs_info->global_block_rsv); |
| 3516 | if (ret) |
| 3517 | goto out; |
| 3518 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 3519 | trans = btrfs_join_transaction(root); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3520 | if (IS_ERR(trans)) { |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 3521 | ret = PTR_ERR(trans); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3522 | goto out; |
| 3523 | } |
| 3524 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 3525 | ret = btrfs_truncate_free_space_cache(root, trans, block_group, inode); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3526 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3527 | btrfs_end_transaction(trans, root); |
Liu Bo | b53d3f5 | 2012-11-14 14:34:34 +0000 | [diff] [blame] | 3528 | btrfs_btree_balance_dirty(root); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3529 | out: |
| 3530 | iput(inode); |
| 3531 | return ret; |
| 3532 | } |
| 3533 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3534 | /* |
| 3535 | * helper to add tree blocks for backref of type BTRFS_EXTENT_DATA_REF_KEY |
| 3536 | * this function scans fs tree to find blocks reference the data extent |
| 3537 | */ |
| 3538 | static int find_data_references(struct reloc_control *rc, |
| 3539 | struct btrfs_key *extent_key, |
| 3540 | struct extent_buffer *leaf, |
| 3541 | struct btrfs_extent_data_ref *ref, |
| 3542 | struct rb_root *blocks) |
| 3543 | { |
| 3544 | struct btrfs_path *path; |
| 3545 | struct tree_block *block; |
| 3546 | struct btrfs_root *root; |
| 3547 | struct btrfs_file_extent_item *fi; |
| 3548 | struct rb_node *rb_node; |
| 3549 | struct btrfs_key key; |
| 3550 | u64 ref_root; |
| 3551 | u64 ref_objectid; |
| 3552 | u64 ref_offset; |
| 3553 | u32 ref_count; |
| 3554 | u32 nritems; |
| 3555 | int err = 0; |
| 3556 | int added = 0; |
| 3557 | int counted; |
| 3558 | int ret; |
| 3559 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3560 | ref_root = btrfs_extent_data_ref_root(leaf, ref); |
| 3561 | ref_objectid = btrfs_extent_data_ref_objectid(leaf, ref); |
| 3562 | ref_offset = btrfs_extent_data_ref_offset(leaf, ref); |
| 3563 | ref_count = btrfs_extent_data_ref_count(leaf, ref); |
| 3564 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3565 | /* |
| 3566 | * This is an extent belonging to the free space cache, lets just delete |
| 3567 | * it and redo the search. |
| 3568 | */ |
| 3569 | if (ref_root == BTRFS_ROOT_TREE_OBJECTID) { |
| 3570 | ret = delete_block_group_cache(rc->extent_root->fs_info, |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 3571 | rc->block_group, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3572 | NULL, ref_objectid); |
| 3573 | if (ret != -ENOENT) |
| 3574 | return ret; |
| 3575 | ret = 0; |
| 3576 | } |
| 3577 | |
| 3578 | path = btrfs_alloc_path(); |
| 3579 | if (!path) |
| 3580 | return -ENOMEM; |
David Sterba | e4058b5 | 2015-11-27 16:31:35 +0100 | [diff] [blame] | 3581 | path->reada = READA_FORWARD; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3582 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3583 | root = read_fs_root(rc->extent_root->fs_info, ref_root); |
| 3584 | if (IS_ERR(root)) { |
| 3585 | err = PTR_ERR(root); |
| 3586 | goto out; |
| 3587 | } |
| 3588 | |
| 3589 | key.objectid = ref_objectid; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3590 | key.type = BTRFS_EXTENT_DATA_KEY; |
Yan, Zheng | 84850e8 | 2011-08-29 09:25:53 +0800 | [diff] [blame] | 3591 | if (ref_offset > ((u64)-1 << 32)) |
| 3592 | key.offset = 0; |
| 3593 | else |
| 3594 | key.offset = ref_offset; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3595 | |
| 3596 | path->search_commit_root = 1; |
| 3597 | path->skip_locking = 1; |
| 3598 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 3599 | if (ret < 0) { |
| 3600 | err = ret; |
| 3601 | goto out; |
| 3602 | } |
| 3603 | |
| 3604 | leaf = path->nodes[0]; |
| 3605 | nritems = btrfs_header_nritems(leaf); |
| 3606 | /* |
| 3607 | * the references in tree blocks that use full backrefs |
| 3608 | * are not counted in |
| 3609 | */ |
| 3610 | if (block_use_full_backref(rc, leaf)) |
| 3611 | counted = 0; |
| 3612 | else |
| 3613 | counted = 1; |
| 3614 | rb_node = tree_search(blocks, leaf->start); |
| 3615 | if (rb_node) { |
| 3616 | if (counted) |
| 3617 | added = 1; |
| 3618 | else |
| 3619 | path->slots[0] = nritems; |
| 3620 | } |
| 3621 | |
| 3622 | while (ref_count > 0) { |
| 3623 | while (path->slots[0] >= nritems) { |
| 3624 | ret = btrfs_next_leaf(root, path); |
| 3625 | if (ret < 0) { |
| 3626 | err = ret; |
| 3627 | goto out; |
| 3628 | } |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 3629 | if (WARN_ON(ret > 0)) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3630 | goto out; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3631 | |
| 3632 | leaf = path->nodes[0]; |
| 3633 | nritems = btrfs_header_nritems(leaf); |
| 3634 | added = 0; |
| 3635 | |
| 3636 | if (block_use_full_backref(rc, leaf)) |
| 3637 | counted = 0; |
| 3638 | else |
| 3639 | counted = 1; |
| 3640 | rb_node = tree_search(blocks, leaf->start); |
| 3641 | if (rb_node) { |
| 3642 | if (counted) |
| 3643 | added = 1; |
| 3644 | else |
| 3645 | path->slots[0] = nritems; |
| 3646 | } |
| 3647 | } |
| 3648 | |
| 3649 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 3650 | if (WARN_ON(key.objectid != ref_objectid || |
| 3651 | key.type != BTRFS_EXTENT_DATA_KEY)) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3652 | break; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3653 | |
| 3654 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 3655 | struct btrfs_file_extent_item); |
| 3656 | |
| 3657 | if (btrfs_file_extent_type(leaf, fi) == |
| 3658 | BTRFS_FILE_EXTENT_INLINE) |
| 3659 | goto next; |
| 3660 | |
| 3661 | if (btrfs_file_extent_disk_bytenr(leaf, fi) != |
| 3662 | extent_key->objectid) |
| 3663 | goto next; |
| 3664 | |
| 3665 | key.offset -= btrfs_file_extent_offset(leaf, fi); |
| 3666 | if (key.offset != ref_offset) |
| 3667 | goto next; |
| 3668 | |
| 3669 | if (counted) |
| 3670 | ref_count--; |
| 3671 | if (added) |
| 3672 | goto next; |
| 3673 | |
David Sterba | 7476dfd | 2014-06-15 03:34:59 +0200 | [diff] [blame] | 3674 | if (!tree_block_processed(leaf->start, rc)) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3675 | block = kmalloc(sizeof(*block), GFP_NOFS); |
| 3676 | if (!block) { |
| 3677 | err = -ENOMEM; |
| 3678 | break; |
| 3679 | } |
| 3680 | block->bytenr = leaf->start; |
| 3681 | btrfs_item_key_to_cpu(leaf, &block->key, 0); |
| 3682 | block->level = 0; |
| 3683 | block->key_ready = 1; |
| 3684 | rb_node = tree_insert(blocks, block->bytenr, |
| 3685 | &block->rb_node); |
Jeff Mahoney | 43c04fb | 2011-10-03 23:22:33 -0400 | [diff] [blame] | 3686 | if (rb_node) |
| 3687 | backref_tree_panic(rb_node, -EEXIST, |
| 3688 | block->bytenr); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3689 | } |
| 3690 | if (counted) |
| 3691 | added = 1; |
| 3692 | else |
| 3693 | path->slots[0] = nritems; |
| 3694 | next: |
| 3695 | path->slots[0]++; |
| 3696 | |
| 3697 | } |
| 3698 | out: |
| 3699 | btrfs_free_path(path); |
| 3700 | return err; |
| 3701 | } |
| 3702 | |
| 3703 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 3704 | * helper to find all tree blocks that reference a given data extent |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3705 | */ |
| 3706 | static noinline_for_stack |
| 3707 | int add_data_references(struct reloc_control *rc, |
| 3708 | struct btrfs_key *extent_key, |
| 3709 | struct btrfs_path *path, |
| 3710 | struct rb_root *blocks) |
| 3711 | { |
| 3712 | struct btrfs_key key; |
| 3713 | struct extent_buffer *eb; |
| 3714 | struct btrfs_extent_data_ref *dref; |
| 3715 | struct btrfs_extent_inline_ref *iref; |
| 3716 | unsigned long ptr; |
| 3717 | unsigned long end; |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 3718 | u32 blocksize = rc->extent_root->nodesize; |
Filipe David Borba Manana | 647f63b | 2013-07-13 12:25:15 +0100 | [diff] [blame] | 3719 | int ret = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3720 | int err = 0; |
| 3721 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3722 | eb = path->nodes[0]; |
| 3723 | ptr = btrfs_item_ptr_offset(eb, path->slots[0]); |
| 3724 | end = ptr + btrfs_item_size_nr(eb, path->slots[0]); |
| 3725 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 3726 | if (ptr + sizeof(struct btrfs_extent_item_v0) == end) |
| 3727 | ptr = end; |
| 3728 | else |
| 3729 | #endif |
| 3730 | ptr += sizeof(struct btrfs_extent_item); |
| 3731 | |
| 3732 | while (ptr < end) { |
| 3733 | iref = (struct btrfs_extent_inline_ref *)ptr; |
| 3734 | key.type = btrfs_extent_inline_ref_type(eb, iref); |
| 3735 | if (key.type == BTRFS_SHARED_DATA_REF_KEY) { |
| 3736 | key.offset = btrfs_extent_inline_ref_offset(eb, iref); |
| 3737 | ret = __add_tree_block(rc, key.offset, blocksize, |
| 3738 | blocks); |
| 3739 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 3740 | dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| 3741 | ret = find_data_references(rc, extent_key, |
| 3742 | eb, dref, blocks); |
| 3743 | } else { |
| 3744 | BUG(); |
| 3745 | } |
Filipe David Borba Manana | 647f63b | 2013-07-13 12:25:15 +0100 | [diff] [blame] | 3746 | if (ret) { |
| 3747 | err = ret; |
| 3748 | goto out; |
| 3749 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3750 | ptr += btrfs_extent_inline_ref_size(key.type); |
| 3751 | } |
| 3752 | WARN_ON(ptr > end); |
| 3753 | |
| 3754 | while (1) { |
| 3755 | cond_resched(); |
| 3756 | eb = path->nodes[0]; |
| 3757 | if (path->slots[0] >= btrfs_header_nritems(eb)) { |
| 3758 | ret = btrfs_next_leaf(rc->extent_root, path); |
| 3759 | if (ret < 0) { |
| 3760 | err = ret; |
| 3761 | break; |
| 3762 | } |
| 3763 | if (ret > 0) |
| 3764 | break; |
| 3765 | eb = path->nodes[0]; |
| 3766 | } |
| 3767 | |
| 3768 | btrfs_item_key_to_cpu(eb, &key, path->slots[0]); |
| 3769 | if (key.objectid != extent_key->objectid) |
| 3770 | break; |
| 3771 | |
| 3772 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 3773 | if (key.type == BTRFS_SHARED_DATA_REF_KEY || |
| 3774 | key.type == BTRFS_EXTENT_REF_V0_KEY) { |
| 3775 | #else |
| 3776 | BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY); |
| 3777 | if (key.type == BTRFS_SHARED_DATA_REF_KEY) { |
| 3778 | #endif |
| 3779 | ret = __add_tree_block(rc, key.offset, blocksize, |
| 3780 | blocks); |
| 3781 | } else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { |
| 3782 | dref = btrfs_item_ptr(eb, path->slots[0], |
| 3783 | struct btrfs_extent_data_ref); |
| 3784 | ret = find_data_references(rc, extent_key, |
| 3785 | eb, dref, blocks); |
| 3786 | } else { |
| 3787 | ret = 0; |
| 3788 | } |
| 3789 | if (ret) { |
| 3790 | err = ret; |
| 3791 | break; |
| 3792 | } |
| 3793 | path->slots[0]++; |
| 3794 | } |
Filipe David Borba Manana | 647f63b | 2013-07-13 12:25:15 +0100 | [diff] [blame] | 3795 | out: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3796 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3797 | if (err) |
| 3798 | free_block_list(blocks); |
| 3799 | return err; |
| 3800 | } |
| 3801 | |
| 3802 | /* |
Liu Bo | 2c016dc | 2012-12-26 15:32:17 +0800 | [diff] [blame] | 3803 | * helper to find next unprocessed extent |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3804 | */ |
| 3805 | static noinline_for_stack |
Zhaolei | 147d256 | 2015-08-06 20:58:11 +0800 | [diff] [blame] | 3806 | int find_next_extent(struct reloc_control *rc, struct btrfs_path *path, |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3807 | struct btrfs_key *extent_key) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3808 | { |
| 3809 | struct btrfs_key key; |
| 3810 | struct extent_buffer *leaf; |
| 3811 | u64 start, end, last; |
| 3812 | int ret; |
| 3813 | |
| 3814 | last = rc->block_group->key.objectid + rc->block_group->key.offset; |
| 3815 | while (1) { |
| 3816 | cond_resched(); |
| 3817 | if (rc->search_start >= last) { |
| 3818 | ret = 1; |
| 3819 | break; |
| 3820 | } |
| 3821 | |
| 3822 | key.objectid = rc->search_start; |
| 3823 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 3824 | key.offset = 0; |
| 3825 | |
| 3826 | path->search_commit_root = 1; |
| 3827 | path->skip_locking = 1; |
| 3828 | ret = btrfs_search_slot(NULL, rc->extent_root, &key, path, |
| 3829 | 0, 0); |
| 3830 | if (ret < 0) |
| 3831 | break; |
| 3832 | next: |
| 3833 | leaf = path->nodes[0]; |
| 3834 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 3835 | ret = btrfs_next_leaf(rc->extent_root, path); |
| 3836 | if (ret != 0) |
| 3837 | break; |
| 3838 | leaf = path->nodes[0]; |
| 3839 | } |
| 3840 | |
| 3841 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 3842 | if (key.objectid >= last) { |
| 3843 | ret = 1; |
| 3844 | break; |
| 3845 | } |
| 3846 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3847 | if (key.type != BTRFS_EXTENT_ITEM_KEY && |
| 3848 | key.type != BTRFS_METADATA_ITEM_KEY) { |
| 3849 | path->slots[0]++; |
| 3850 | goto next; |
| 3851 | } |
| 3852 | |
| 3853 | if (key.type == BTRFS_EXTENT_ITEM_KEY && |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3854 | key.objectid + key.offset <= rc->search_start) { |
| 3855 | path->slots[0]++; |
| 3856 | goto next; |
| 3857 | } |
| 3858 | |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3859 | if (key.type == BTRFS_METADATA_ITEM_KEY && |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 3860 | key.objectid + rc->extent_root->nodesize <= |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3861 | rc->search_start) { |
| 3862 | path->slots[0]++; |
| 3863 | goto next; |
| 3864 | } |
| 3865 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3866 | ret = find_first_extent_bit(&rc->processed_blocks, |
| 3867 | key.objectid, &start, &end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 3868 | EXTENT_DIRTY, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3869 | |
| 3870 | if (ret == 0 && start <= key.objectid) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3871 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3872 | rc->search_start = end + 1; |
| 3873 | } else { |
Josef Bacik | 3173a18 | 2013-03-07 14:22:04 -0500 | [diff] [blame] | 3874 | if (key.type == BTRFS_EXTENT_ITEM_KEY) |
| 3875 | rc->search_start = key.objectid + key.offset; |
| 3876 | else |
| 3877 | rc->search_start = key.objectid + |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 3878 | rc->extent_root->nodesize; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3879 | memcpy(extent_key, &key, sizeof(key)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3880 | return 0; |
| 3881 | } |
| 3882 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3883 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3884 | return ret; |
| 3885 | } |
| 3886 | |
| 3887 | static void set_reloc_control(struct reloc_control *rc) |
| 3888 | { |
| 3889 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 3890 | |
| 3891 | mutex_lock(&fs_info->reloc_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3892 | fs_info->reloc_ctl = rc; |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 3893 | mutex_unlock(&fs_info->reloc_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3894 | } |
| 3895 | |
| 3896 | static void unset_reloc_control(struct reloc_control *rc) |
| 3897 | { |
| 3898 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 3899 | |
| 3900 | mutex_lock(&fs_info->reloc_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3901 | fs_info->reloc_ctl = NULL; |
Chris Mason | 7585717 | 2011-06-13 20:00:16 -0400 | [diff] [blame] | 3902 | mutex_unlock(&fs_info->reloc_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3903 | } |
| 3904 | |
| 3905 | static int check_extent_flags(u64 flags) |
| 3906 | { |
| 3907 | if ((flags & BTRFS_EXTENT_FLAG_DATA) && |
| 3908 | (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) |
| 3909 | return 1; |
| 3910 | if (!(flags & BTRFS_EXTENT_FLAG_DATA) && |
| 3911 | !(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) |
| 3912 | return 1; |
| 3913 | if ((flags & BTRFS_EXTENT_FLAG_DATA) && |
| 3914 | (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) |
| 3915 | return 1; |
| 3916 | return 0; |
| 3917 | } |
| 3918 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3919 | static noinline_for_stack |
| 3920 | int prepare_to_relocate(struct reloc_control *rc) |
| 3921 | { |
| 3922 | struct btrfs_trans_handle *trans; |
Josef Bacik | ac2faba | 2016-05-27 13:08:26 -0400 | [diff] [blame] | 3923 | int ret; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3924 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 3925 | rc->block_rsv = btrfs_alloc_block_rsv(rc->extent_root, |
| 3926 | BTRFS_BLOCK_RSV_TEMP); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3927 | if (!rc->block_rsv) |
| 3928 | return -ENOMEM; |
| 3929 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3930 | memset(&rc->cluster, 0, sizeof(rc->cluster)); |
| 3931 | rc->search_start = rc->block_group->key.objectid; |
| 3932 | rc->extents_found = 0; |
| 3933 | rc->nodes_relocated = 0; |
| 3934 | rc->merging_rsv_size = 0; |
Wang Shilong | 0647bf5 | 2013-11-20 09:01:52 +0800 | [diff] [blame] | 3935 | rc->reserved_bytes = 0; |
| 3936 | rc->block_rsv->size = rc->extent_root->nodesize * |
| 3937 | RELOCATION_RESERVED_NODES; |
Josef Bacik | ac2faba | 2016-05-27 13:08:26 -0400 | [diff] [blame] | 3938 | ret = btrfs_block_rsv_refill(rc->extent_root, |
| 3939 | rc->block_rsv, rc->block_rsv->size, |
| 3940 | BTRFS_RESERVE_FLUSH_ALL); |
| 3941 | if (ret) |
| 3942 | return ret; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3943 | |
| 3944 | rc->create_reloc_tree = 1; |
| 3945 | set_reloc_control(rc); |
| 3946 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 3947 | trans = btrfs_join_transaction(rc->extent_root); |
Liu Bo | 2881894 | 2013-03-04 16:25:39 +0000 | [diff] [blame] | 3948 | if (IS_ERR(trans)) { |
| 3949 | unset_reloc_control(rc); |
| 3950 | /* |
| 3951 | * extent tree is not a ref_cow tree and has no reloc_root to |
| 3952 | * cleanup. And callers are responsible to free the above |
| 3953 | * block rsv. |
| 3954 | */ |
| 3955 | return PTR_ERR(trans); |
| 3956 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3957 | btrfs_commit_transaction(trans, rc->extent_root); |
| 3958 | return 0; |
| 3959 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3960 | |
Qu Wenruo | 62b9954 | 2016-08-15 10:36:51 +0800 | [diff] [blame] | 3961 | /* |
| 3962 | * Qgroup fixer for data chunk relocation. |
| 3963 | * The data relocation is done in the following steps |
| 3964 | * 1) Copy data extents into data reloc tree |
| 3965 | * 2) Create tree reloc tree(special snapshot) for related subvolumes |
| 3966 | * 3) Modify file extents in tree reloc tree |
| 3967 | * 4) Merge tree reloc tree with original fs tree, by swapping tree blocks |
| 3968 | * |
| 3969 | * The problem is, data and tree reloc tree are not accounted to qgroup, |
| 3970 | * and 4) will only info qgroup to track tree blocks change, not file extents |
| 3971 | * in the tree blocks. |
| 3972 | * |
| 3973 | * The good news is, related data extents are all in data reloc tree, so we |
| 3974 | * only need to info qgroup to track all file extents in data reloc tree |
| 3975 | * before commit trans. |
| 3976 | */ |
| 3977 | static int qgroup_fix_relocated_data_extents(struct btrfs_trans_handle *trans, |
| 3978 | struct reloc_control *rc) |
| 3979 | { |
| 3980 | struct btrfs_fs_info *fs_info = rc->extent_root->fs_info; |
| 3981 | struct inode *inode = rc->data_inode; |
| 3982 | struct btrfs_root *data_reloc_root = BTRFS_I(inode)->root; |
| 3983 | struct btrfs_path *path; |
| 3984 | struct btrfs_key key; |
| 3985 | int ret = 0; |
| 3986 | |
Josef Bacik | afcdd12 | 2016-09-02 15:40:02 -0400 | [diff] [blame] | 3987 | if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) |
Qu Wenruo | 62b9954 | 2016-08-15 10:36:51 +0800 | [diff] [blame] | 3988 | return 0; |
| 3989 | |
| 3990 | /* |
| 3991 | * Only for stage where we update data pointers the qgroup fix is |
| 3992 | * valid. |
| 3993 | * For MOVING_DATA stage, we will miss the timing of swapping tree |
| 3994 | * blocks, and won't fix it. |
| 3995 | */ |
| 3996 | if (!(rc->stage == UPDATE_DATA_PTRS && rc->extents_found)) |
| 3997 | return 0; |
| 3998 | |
| 3999 | path = btrfs_alloc_path(); |
| 4000 | if (!path) |
| 4001 | return -ENOMEM; |
| 4002 | key.objectid = btrfs_ino(inode); |
| 4003 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 4004 | key.offset = 0; |
| 4005 | |
| 4006 | ret = btrfs_search_slot(NULL, data_reloc_root, &key, path, 0, 0); |
| 4007 | if (ret < 0) |
| 4008 | goto out; |
| 4009 | |
| 4010 | lock_extent(&BTRFS_I(inode)->io_tree, 0, (u64)-1); |
| 4011 | while (1) { |
| 4012 | struct btrfs_file_extent_item *fi; |
| 4013 | |
| 4014 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 4015 | if (key.objectid > btrfs_ino(inode)) |
| 4016 | break; |
| 4017 | if (key.type != BTRFS_EXTENT_DATA_KEY) |
| 4018 | goto next; |
| 4019 | fi = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 4020 | struct btrfs_file_extent_item); |
| 4021 | if (btrfs_file_extent_type(path->nodes[0], fi) != |
| 4022 | BTRFS_FILE_EXTENT_REG) |
| 4023 | goto next; |
| 4024 | ret = btrfs_qgroup_insert_dirty_extent(trans, fs_info, |
| 4025 | btrfs_file_extent_disk_bytenr(path->nodes[0], fi), |
| 4026 | btrfs_file_extent_disk_num_bytes(path->nodes[0], fi), |
| 4027 | GFP_NOFS); |
| 4028 | if (ret < 0) |
| 4029 | break; |
| 4030 | next: |
| 4031 | ret = btrfs_next_item(data_reloc_root, path); |
| 4032 | if (ret < 0) |
| 4033 | break; |
| 4034 | if (ret > 0) { |
| 4035 | ret = 0; |
| 4036 | break; |
| 4037 | } |
| 4038 | } |
| 4039 | unlock_extent(&BTRFS_I(inode)->io_tree, 0 , (u64)-1); |
| 4040 | out: |
| 4041 | btrfs_free_path(path); |
| 4042 | return ret; |
| 4043 | } |
| 4044 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4045 | static noinline_for_stack int relocate_block_group(struct reloc_control *rc) |
| 4046 | { |
| 4047 | struct rb_root blocks = RB_ROOT; |
| 4048 | struct btrfs_key key; |
| 4049 | struct btrfs_trans_handle *trans = NULL; |
| 4050 | struct btrfs_path *path; |
| 4051 | struct btrfs_extent_item *ei; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4052 | u64 flags; |
| 4053 | u32 item_size; |
| 4054 | int ret; |
| 4055 | int err = 0; |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 4056 | int progress = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4057 | |
| 4058 | path = btrfs_alloc_path(); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4059 | if (!path) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4060 | return -ENOMEM; |
David Sterba | e4058b5 | 2015-11-27 16:31:35 +0100 | [diff] [blame] | 4061 | path->reada = READA_FORWARD; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4062 | |
| 4063 | ret = prepare_to_relocate(rc); |
| 4064 | if (ret) { |
| 4065 | err = ret; |
| 4066 | goto out_free; |
Jiri Slaby | 2423fdf | 2010-01-06 16:57:22 +0000 | [diff] [blame] | 4067 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4068 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4069 | while (1) { |
Wang Shilong | 0647bf5 | 2013-11-20 09:01:52 +0800 | [diff] [blame] | 4070 | rc->reserved_bytes = 0; |
| 4071 | ret = btrfs_block_rsv_refill(rc->extent_root, |
| 4072 | rc->block_rsv, rc->block_rsv->size, |
| 4073 | BTRFS_RESERVE_FLUSH_ALL); |
| 4074 | if (ret) { |
| 4075 | err = ret; |
| 4076 | break; |
| 4077 | } |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 4078 | progress++; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4079 | trans = btrfs_start_transaction(rc->extent_root, 0); |
Liu Bo | 0f788c5 | 2013-03-04 16:25:40 +0000 | [diff] [blame] | 4080 | if (IS_ERR(trans)) { |
| 4081 | err = PTR_ERR(trans); |
| 4082 | trans = NULL; |
| 4083 | break; |
| 4084 | } |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 4085 | restart: |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4086 | if (update_backref_cache(trans, &rc->backref_cache)) { |
| 4087 | btrfs_end_transaction(trans, rc->extent_root); |
| 4088 | continue; |
| 4089 | } |
| 4090 | |
Zhaolei | 147d256 | 2015-08-06 20:58:11 +0800 | [diff] [blame] | 4091 | ret = find_next_extent(rc, path, &key); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4092 | if (ret < 0) |
| 4093 | err = ret; |
| 4094 | if (ret != 0) |
| 4095 | break; |
| 4096 | |
| 4097 | rc->extents_found++; |
| 4098 | |
| 4099 | ei = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 4100 | struct btrfs_extent_item); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4101 | item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4102 | if (item_size >= sizeof(*ei)) { |
| 4103 | flags = btrfs_extent_flags(path->nodes[0], ei); |
| 4104 | ret = check_extent_flags(flags); |
| 4105 | BUG_ON(ret); |
| 4106 | |
| 4107 | } else { |
| 4108 | #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| 4109 | u64 ref_owner; |
| 4110 | int path_change = 0; |
| 4111 | |
| 4112 | BUG_ON(item_size != |
| 4113 | sizeof(struct btrfs_extent_item_v0)); |
| 4114 | ret = get_ref_objectid_v0(rc, path, &key, &ref_owner, |
| 4115 | &path_change); |
Zhaolei | 4b3576e | 2015-08-05 18:00:02 +0800 | [diff] [blame] | 4116 | if (ret < 0) { |
| 4117 | err = ret; |
| 4118 | break; |
| 4119 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4120 | if (ref_owner < BTRFS_FIRST_FREE_OBJECTID) |
| 4121 | flags = BTRFS_EXTENT_FLAG_TREE_BLOCK; |
| 4122 | else |
| 4123 | flags = BTRFS_EXTENT_FLAG_DATA; |
| 4124 | |
| 4125 | if (path_change) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 4126 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4127 | |
| 4128 | path->search_commit_root = 1; |
| 4129 | path->skip_locking = 1; |
| 4130 | ret = btrfs_search_slot(NULL, rc->extent_root, |
| 4131 | &key, path, 0, 0); |
| 4132 | if (ret < 0) { |
| 4133 | err = ret; |
| 4134 | break; |
| 4135 | } |
| 4136 | BUG_ON(ret > 0); |
| 4137 | } |
| 4138 | #else |
| 4139 | BUG(); |
| 4140 | #endif |
| 4141 | } |
| 4142 | |
| 4143 | if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
| 4144 | ret = add_tree_block(rc, &key, path, &blocks); |
| 4145 | } else if (rc->stage == UPDATE_DATA_PTRS && |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4146 | (flags & BTRFS_EXTENT_FLAG_DATA)) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4147 | ret = add_data_references(rc, &key, path, &blocks); |
| 4148 | } else { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 4149 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4150 | ret = 0; |
| 4151 | } |
| 4152 | if (ret < 0) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4153 | err = ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4154 | break; |
| 4155 | } |
| 4156 | |
| 4157 | if (!RB_EMPTY_ROOT(&blocks)) { |
| 4158 | ret = relocate_tree_blocks(trans, rc, &blocks); |
| 4159 | if (ret < 0) { |
Wang Shilong | 1708cc5 | 2013-12-28 19:52:39 +0800 | [diff] [blame] | 4160 | /* |
| 4161 | * if we fail to relocate tree blocks, force to update |
| 4162 | * backref cache when committing transaction. |
| 4163 | */ |
| 4164 | rc->backref_cache.last_trans = trans->transid - 1; |
| 4165 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4166 | if (ret != -EAGAIN) { |
| 4167 | err = ret; |
| 4168 | break; |
| 4169 | } |
| 4170 | rc->extents_found--; |
| 4171 | rc->search_start = key.objectid; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4172 | } |
| 4173 | } |
| 4174 | |
Wang Shilong | 0647bf5 | 2013-11-20 09:01:52 +0800 | [diff] [blame] | 4175 | btrfs_end_transaction_throttle(trans, rc->extent_root); |
| 4176 | btrfs_btree_balance_dirty(rc->extent_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4177 | trans = NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4178 | |
| 4179 | if (rc->stage == MOVE_DATA_EXTENTS && |
| 4180 | (flags & BTRFS_EXTENT_FLAG_DATA)) { |
| 4181 | rc->found_file_extent = 1; |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4182 | ret = relocate_data_extent(rc->data_inode, |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4183 | &key, &rc->cluster); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4184 | if (ret < 0) { |
| 4185 | err = ret; |
| 4186 | break; |
| 4187 | } |
| 4188 | } |
| 4189 | } |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 4190 | if (trans && progress && err == -ENOSPC) { |
| 4191 | ret = btrfs_force_chunk_alloc(trans, rc->extent_root, |
| 4192 | rc->block_group->flags); |
Shilong Wang | 9689457 | 2015-04-12 14:35:20 +0800 | [diff] [blame] | 4193 | if (ret == 1) { |
Chris Mason | c87f08c | 2011-02-16 13:57:04 -0500 | [diff] [blame] | 4194 | err = 0; |
| 4195 | progress = 0; |
| 4196 | goto restart; |
| 4197 | } |
| 4198 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4199 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 4200 | btrfs_release_path(path); |
David Sterba | 9116621 | 2016-04-26 23:54:39 +0200 | [diff] [blame] | 4201 | clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4202 | |
| 4203 | if (trans) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4204 | btrfs_end_transaction_throttle(trans, rc->extent_root); |
Liu Bo | b53d3f5 | 2012-11-14 14:34:34 +0000 | [diff] [blame] | 4205 | btrfs_btree_balance_dirty(rc->extent_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4206 | } |
| 4207 | |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4208 | if (!err) { |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4209 | ret = relocate_file_extent_cluster(rc->data_inode, |
| 4210 | &rc->cluster); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4211 | if (ret < 0) |
| 4212 | err = ret; |
| 4213 | } |
| 4214 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4215 | rc->create_reloc_tree = 0; |
| 4216 | set_reloc_control(rc); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4217 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4218 | backref_cache_cleanup(&rc->backref_cache); |
| 4219 | btrfs_block_rsv_release(rc->extent_root, rc->block_rsv, (u64)-1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4220 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4221 | err = prepare_to_merge(rc, err); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4222 | |
| 4223 | merge_reloc_roots(rc); |
| 4224 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4225 | rc->merge_reloc_tree = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4226 | unset_reloc_control(rc); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4227 | btrfs_block_rsv_release(rc->extent_root, rc->block_rsv, (u64)-1); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4228 | |
| 4229 | /* get rid of pinned extents */ |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 4230 | trans = btrfs_join_transaction(rc->extent_root); |
Qu Wenruo | 62b9954 | 2016-08-15 10:36:51 +0800 | [diff] [blame] | 4231 | if (IS_ERR(trans)) { |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 4232 | err = PTR_ERR(trans); |
Qu Wenruo | 62b9954 | 2016-08-15 10:36:51 +0800 | [diff] [blame] | 4233 | goto out_free; |
| 4234 | } |
Liu Bo | a9b1fc8 | 2016-08-31 16:43:33 -0700 | [diff] [blame] | 4235 | ret = qgroup_fix_relocated_data_extents(trans, rc); |
| 4236 | if (ret < 0) { |
| 4237 | btrfs_abort_transaction(trans, ret); |
| 4238 | if (!err) |
| 4239 | err = ret; |
Qu Wenruo | 62b9954 | 2016-08-15 10:36:51 +0800 | [diff] [blame] | 4240 | goto out_free; |
| 4241 | } |
| 4242 | btrfs_commit_transaction(trans, rc->extent_root); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4243 | out_free: |
| 4244 | btrfs_free_block_rsv(rc->extent_root, rc->block_rsv); |
| 4245 | btrfs_free_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4246 | return err; |
| 4247 | } |
| 4248 | |
| 4249 | static int __insert_orphan_inode(struct btrfs_trans_handle *trans, |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4250 | struct btrfs_root *root, u64 objectid) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4251 | { |
| 4252 | struct btrfs_path *path; |
| 4253 | struct btrfs_inode_item *item; |
| 4254 | struct extent_buffer *leaf; |
| 4255 | int ret; |
| 4256 | |
| 4257 | path = btrfs_alloc_path(); |
| 4258 | if (!path) |
| 4259 | return -ENOMEM; |
| 4260 | |
| 4261 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
| 4262 | if (ret) |
| 4263 | goto out; |
| 4264 | |
| 4265 | leaf = path->nodes[0]; |
| 4266 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); |
| 4267 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); |
| 4268 | btrfs_set_inode_generation(leaf, item, 1); |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4269 | btrfs_set_inode_size(leaf, item, 0); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4270 | btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4271 | btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS | |
| 4272 | BTRFS_INODE_PREALLOC); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4273 | btrfs_mark_buffer_dirty(leaf); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4274 | out: |
| 4275 | btrfs_free_path(path); |
| 4276 | return ret; |
| 4277 | } |
| 4278 | |
| 4279 | /* |
| 4280 | * helper to create inode for data relocation. |
| 4281 | * the inode is in data relocation tree and its link count is 0 |
| 4282 | */ |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4283 | static noinline_for_stack |
| 4284 | struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, |
| 4285 | struct btrfs_block_group_cache *group) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4286 | { |
| 4287 | struct inode *inode = NULL; |
| 4288 | struct btrfs_trans_handle *trans; |
| 4289 | struct btrfs_root *root; |
| 4290 | struct btrfs_key key; |
Zhaolei | 4624900 | 2015-08-05 18:00:03 +0800 | [diff] [blame] | 4291 | u64 objectid; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4292 | int err = 0; |
| 4293 | |
| 4294 | root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID); |
| 4295 | if (IS_ERR(root)) |
| 4296 | return ERR_CAST(root); |
| 4297 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4298 | trans = btrfs_start_transaction(root, 6); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4299 | if (IS_ERR(trans)) |
| 4300 | return ERR_CAST(trans); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4301 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 4302 | err = btrfs_find_free_objectid(root, &objectid); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4303 | if (err) |
| 4304 | goto out; |
| 4305 | |
Yan, Zheng | 0257bb8 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4306 | err = __insert_orphan_inode(trans, root, objectid); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4307 | BUG_ON(err); |
| 4308 | |
| 4309 | key.objectid = objectid; |
| 4310 | key.type = BTRFS_INODE_ITEM_KEY; |
| 4311 | key.offset = 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 4312 | inode = btrfs_iget(root->fs_info->sb, &key, root, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4313 | BUG_ON(IS_ERR(inode) || is_bad_inode(inode)); |
| 4314 | BTRFS_I(inode)->index_cnt = group->key.objectid; |
| 4315 | |
| 4316 | err = btrfs_orphan_add(trans, inode); |
| 4317 | out: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4318 | btrfs_end_transaction(trans, root); |
Liu Bo | b53d3f5 | 2012-11-14 14:34:34 +0000 | [diff] [blame] | 4319 | btrfs_btree_balance_dirty(root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4320 | if (err) { |
| 4321 | if (inode) |
| 4322 | iput(inode); |
| 4323 | inode = ERR_PTR(err); |
| 4324 | } |
| 4325 | return inode; |
| 4326 | } |
| 4327 | |
Josef Bacik | a9995ee | 2013-05-31 13:04:36 -0400 | [diff] [blame] | 4328 | static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info) |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4329 | { |
| 4330 | struct reloc_control *rc; |
| 4331 | |
| 4332 | rc = kzalloc(sizeof(*rc), GFP_NOFS); |
| 4333 | if (!rc) |
| 4334 | return NULL; |
| 4335 | |
| 4336 | INIT_LIST_HEAD(&rc->reloc_roots); |
| 4337 | backref_cache_init(&rc->backref_cache); |
| 4338 | mapping_tree_init(&rc->reloc_root_tree); |
Josef Bacik | a9995ee | 2013-05-31 13:04:36 -0400 | [diff] [blame] | 4339 | extent_io_tree_init(&rc->processed_blocks, |
| 4340 | fs_info->btree_inode->i_mapping); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4341 | return rc; |
| 4342 | } |
| 4343 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4344 | /* |
| 4345 | * function to relocate all extents in a block group. |
| 4346 | */ |
| 4347 | int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start) |
| 4348 | { |
| 4349 | struct btrfs_fs_info *fs_info = extent_root->fs_info; |
| 4350 | struct reloc_control *rc; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4351 | struct inode *inode; |
| 4352 | struct btrfs_path *path; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4353 | int ret; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4354 | int rw = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4355 | int err = 0; |
| 4356 | |
Josef Bacik | a9995ee | 2013-05-31 13:04:36 -0400 | [diff] [blame] | 4357 | rc = alloc_reloc_control(fs_info); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4358 | if (!rc) |
| 4359 | return -ENOMEM; |
| 4360 | |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4361 | rc->extent_root = extent_root; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4362 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4363 | rc->block_group = btrfs_lookup_block_group(fs_info, group_start); |
| 4364 | BUG_ON(!rc->block_group); |
| 4365 | |
Zhaolei | 868f401 | 2015-08-05 16:43:27 +0800 | [diff] [blame] | 4366 | ret = btrfs_inc_block_group_ro(extent_root, rc->block_group); |
| 4367 | if (ret) { |
| 4368 | err = ret; |
| 4369 | goto out; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4370 | } |
Zhaolei | 868f401 | 2015-08-05 16:43:27 +0800 | [diff] [blame] | 4371 | rw = 1; |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4372 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4373 | path = btrfs_alloc_path(); |
| 4374 | if (!path) { |
| 4375 | err = -ENOMEM; |
| 4376 | goto out; |
| 4377 | } |
| 4378 | |
| 4379 | inode = lookup_free_space_inode(fs_info->tree_root, rc->block_group, |
| 4380 | path); |
| 4381 | btrfs_free_path(path); |
| 4382 | |
| 4383 | if (!IS_ERR(inode)) |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 4384 | ret = delete_block_group_cache(fs_info, rc->block_group, inode, 0); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4385 | else |
| 4386 | ret = PTR_ERR(inode); |
| 4387 | |
| 4388 | if (ret && ret != -ENOENT) { |
| 4389 | err = ret; |
| 4390 | goto out; |
| 4391 | } |
| 4392 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4393 | rc->data_inode = create_reloc_inode(fs_info, rc->block_group); |
| 4394 | if (IS_ERR(rc->data_inode)) { |
| 4395 | err = PTR_ERR(rc->data_inode); |
| 4396 | rc->data_inode = NULL; |
| 4397 | goto out; |
| 4398 | } |
| 4399 | |
Jeff Mahoney | 5d163e0 | 2016-09-20 10:05:00 -0400 | [diff] [blame] | 4400 | btrfs_info(extent_root->fs_info, |
| 4401 | "relocating block group %llu flags %llu", |
| 4402 | rc->block_group->key.objectid, rc->block_group->flags); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4403 | |
Filipe Manana | 9cfa3e3 | 2016-04-26 15:39:32 +0100 | [diff] [blame] | 4404 | btrfs_wait_block_group_reservations(rc->block_group); |
Filipe Manana | f78c436 | 2016-05-09 13:15:41 +0100 | [diff] [blame] | 4405 | btrfs_wait_nocow_writers(rc->block_group); |
Filipe Manana | 578def7 | 2016-04-26 15:36:38 +0100 | [diff] [blame] | 4406 | btrfs_wait_ordered_roots(fs_info, -1, |
| 4407 | rc->block_group->key.objectid, |
| 4408 | rc->block_group->key.offset); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4409 | |
| 4410 | while (1) { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4411 | mutex_lock(&fs_info->cleaner_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4412 | ret = relocate_block_group(rc); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4413 | mutex_unlock(&fs_info->cleaner_mutex); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4414 | if (ret < 0) { |
| 4415 | err = ret; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4416 | goto out; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4417 | } |
| 4418 | |
| 4419 | if (rc->extents_found == 0) |
| 4420 | break; |
| 4421 | |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 4422 | btrfs_info(extent_root->fs_info, "found %llu extents", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 4423 | rc->extents_found); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4424 | |
| 4425 | if (rc->stage == MOVE_DATA_EXTENTS && rc->found_file_extent) { |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 4426 | ret = btrfs_wait_ordered_range(rc->data_inode, 0, |
| 4427 | (u64)-1); |
| 4428 | if (ret) { |
| 4429 | err = ret; |
| 4430 | goto out; |
| 4431 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4432 | invalidate_mapping_pages(rc->data_inode->i_mapping, |
| 4433 | 0, -1); |
| 4434 | rc->stage = UPDATE_DATA_PTRS; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4435 | } |
| 4436 | } |
| 4437 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4438 | WARN_ON(rc->block_group->pinned > 0); |
| 4439 | WARN_ON(rc->block_group->reserved > 0); |
| 4440 | WARN_ON(btrfs_block_group_used(&rc->block_group->item) > 0); |
| 4441 | out: |
Yan, Zheng | f0486c6 | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 4442 | if (err && rw) |
Zhaolei | 868f401 | 2015-08-05 16:43:27 +0800 | [diff] [blame] | 4443 | btrfs_dec_block_group_ro(extent_root, rc->block_group); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4444 | iput(rc->data_inode); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4445 | btrfs_put_block_group(rc->block_group); |
| 4446 | kfree(rc); |
| 4447 | return err; |
| 4448 | } |
| 4449 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4450 | static noinline_for_stack int mark_garbage_root(struct btrfs_root *root) |
| 4451 | { |
| 4452 | struct btrfs_trans_handle *trans; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4453 | int ret, err; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4454 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4455 | trans = btrfs_start_transaction(root->fs_info->tree_root, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4456 | if (IS_ERR(trans)) |
| 4457 | return PTR_ERR(trans); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4458 | |
| 4459 | memset(&root->root_item.drop_progress, 0, |
| 4460 | sizeof(root->root_item.drop_progress)); |
| 4461 | root->root_item.drop_level = 0; |
| 4462 | btrfs_set_root_refs(&root->root_item, 0); |
| 4463 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
| 4464 | &root->root_key, &root->root_item); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4465 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4466 | err = btrfs_end_transaction(trans, root->fs_info->tree_root); |
| 4467 | if (err) |
| 4468 | return err; |
| 4469 | return ret; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4470 | } |
| 4471 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4472 | /* |
| 4473 | * recover relocation interrupted by system crash. |
| 4474 | * |
| 4475 | * this function resumes merging reloc trees with corresponding fs trees. |
| 4476 | * this is important for keeping the sharing of tree blocks |
| 4477 | */ |
| 4478 | int btrfs_recover_relocation(struct btrfs_root *root) |
| 4479 | { |
| 4480 | LIST_HEAD(reloc_roots); |
| 4481 | struct btrfs_key key; |
| 4482 | struct btrfs_root *fs_root; |
| 4483 | struct btrfs_root *reloc_root; |
| 4484 | struct btrfs_path *path; |
| 4485 | struct extent_buffer *leaf; |
| 4486 | struct reloc_control *rc = NULL; |
| 4487 | struct btrfs_trans_handle *trans; |
| 4488 | int ret; |
| 4489 | int err = 0; |
| 4490 | |
| 4491 | path = btrfs_alloc_path(); |
| 4492 | if (!path) |
| 4493 | return -ENOMEM; |
David Sterba | e4058b5 | 2015-11-27 16:31:35 +0100 | [diff] [blame] | 4494 | path->reada = READA_BACK; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4495 | |
| 4496 | key.objectid = BTRFS_TREE_RELOC_OBJECTID; |
| 4497 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 4498 | key.offset = (u64)-1; |
| 4499 | |
| 4500 | while (1) { |
| 4501 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, |
| 4502 | path, 0, 0); |
| 4503 | if (ret < 0) { |
| 4504 | err = ret; |
| 4505 | goto out; |
| 4506 | } |
| 4507 | if (ret > 0) { |
| 4508 | if (path->slots[0] == 0) |
| 4509 | break; |
| 4510 | path->slots[0]--; |
| 4511 | } |
| 4512 | leaf = path->nodes[0]; |
| 4513 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 4514 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4515 | |
| 4516 | if (key.objectid != BTRFS_TREE_RELOC_OBJECTID || |
| 4517 | key.type != BTRFS_ROOT_ITEM_KEY) |
| 4518 | break; |
| 4519 | |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 4520 | reloc_root = btrfs_read_fs_root(root, &key); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4521 | if (IS_ERR(reloc_root)) { |
| 4522 | err = PTR_ERR(reloc_root); |
| 4523 | goto out; |
| 4524 | } |
| 4525 | |
| 4526 | list_add(&reloc_root->root_list, &reloc_roots); |
| 4527 | |
| 4528 | if (btrfs_root_refs(&reloc_root->root_item) > 0) { |
| 4529 | fs_root = read_fs_root(root->fs_info, |
| 4530 | reloc_root->root_key.offset); |
| 4531 | if (IS_ERR(fs_root)) { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4532 | ret = PTR_ERR(fs_root); |
| 4533 | if (ret != -ENOENT) { |
| 4534 | err = ret; |
| 4535 | goto out; |
| 4536 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4537 | ret = mark_garbage_root(reloc_root); |
| 4538 | if (ret < 0) { |
| 4539 | err = ret; |
| 4540 | goto out; |
| 4541 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4542 | } |
| 4543 | } |
| 4544 | |
| 4545 | if (key.offset == 0) |
| 4546 | break; |
| 4547 | |
| 4548 | key.offset--; |
| 4549 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 4550 | btrfs_release_path(path); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4551 | |
| 4552 | if (list_empty(&reloc_roots)) |
| 4553 | goto out; |
| 4554 | |
Josef Bacik | a9995ee | 2013-05-31 13:04:36 -0400 | [diff] [blame] | 4555 | rc = alloc_reloc_control(root->fs_info); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4556 | if (!rc) { |
| 4557 | err = -ENOMEM; |
| 4558 | goto out; |
| 4559 | } |
| 4560 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4561 | rc->extent_root = root->fs_info->extent_root; |
| 4562 | |
| 4563 | set_reloc_control(rc); |
| 4564 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 4565 | trans = btrfs_join_transaction(rc->extent_root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 4566 | if (IS_ERR(trans)) { |
| 4567 | unset_reloc_control(rc); |
| 4568 | err = PTR_ERR(trans); |
| 4569 | goto out_free; |
| 4570 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4571 | |
| 4572 | rc->merge_reloc_tree = 1; |
| 4573 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4574 | while (!list_empty(&reloc_roots)) { |
| 4575 | reloc_root = list_entry(reloc_roots.next, |
| 4576 | struct btrfs_root, root_list); |
| 4577 | list_del(&reloc_root->root_list); |
| 4578 | |
| 4579 | if (btrfs_root_refs(&reloc_root->root_item) == 0) { |
| 4580 | list_add_tail(&reloc_root->root_list, |
| 4581 | &rc->reloc_roots); |
| 4582 | continue; |
| 4583 | } |
| 4584 | |
| 4585 | fs_root = read_fs_root(root->fs_info, |
| 4586 | reloc_root->root_key.offset); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4587 | if (IS_ERR(fs_root)) { |
| 4588 | err = PTR_ERR(fs_root); |
| 4589 | goto out_free; |
| 4590 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4591 | |
Jeff Mahoney | ffd7b33 | 2011-10-03 23:23:15 -0400 | [diff] [blame] | 4592 | err = __add_reloc_root(reloc_root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4593 | BUG_ON(err < 0); /* -ENOMEM or logic error */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4594 | fs_root->reloc_root = reloc_root; |
| 4595 | } |
| 4596 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4597 | err = btrfs_commit_transaction(trans, rc->extent_root); |
| 4598 | if (err) |
| 4599 | goto out_free; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4600 | |
| 4601 | merge_reloc_roots(rc); |
| 4602 | |
| 4603 | unset_reloc_control(rc); |
| 4604 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 4605 | trans = btrfs_join_transaction(rc->extent_root); |
Qu Wenruo | 62b9954 | 2016-08-15 10:36:51 +0800 | [diff] [blame] | 4606 | if (IS_ERR(trans)) { |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 4607 | err = PTR_ERR(trans); |
Qu Wenruo | 62b9954 | 2016-08-15 10:36:51 +0800 | [diff] [blame] | 4608 | goto out_free; |
| 4609 | } |
| 4610 | err = qgroup_fix_relocated_data_extents(trans, rc); |
| 4611 | if (err < 0) { |
| 4612 | btrfs_abort_transaction(trans, err); |
| 4613 | goto out_free; |
| 4614 | } |
| 4615 | err = btrfs_commit_transaction(trans, rc->extent_root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 4616 | out_free: |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4617 | kfree(rc); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 4618 | out: |
Liu Bo | aca1bba | 2013-03-04 16:25:37 +0000 | [diff] [blame] | 4619 | if (!list_empty(&reloc_roots)) |
| 4620 | free_reloc_roots(&reloc_roots); |
| 4621 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4622 | btrfs_free_path(path); |
| 4623 | |
| 4624 | if (err == 0) { |
| 4625 | /* cleanup orphan inode in data relocation tree */ |
| 4626 | fs_root = read_fs_root(root->fs_info, |
| 4627 | BTRFS_DATA_RELOC_TREE_OBJECTID); |
| 4628 | if (IS_ERR(fs_root)) |
| 4629 | err = PTR_ERR(fs_root); |
Miao Xie | d7ce584 | 2010-02-02 08:46:44 +0000 | [diff] [blame] | 4630 | else |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 4631 | err = btrfs_orphan_cleanup(fs_root); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4632 | } |
| 4633 | return err; |
| 4634 | } |
| 4635 | |
| 4636 | /* |
| 4637 | * helper to add ordered checksum for data relocation. |
| 4638 | * |
| 4639 | * cloning checksum properly handles the nodatasum extents. |
| 4640 | * it also saves CPU time to re-calculate the checksum. |
| 4641 | */ |
| 4642 | int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) |
| 4643 | { |
| 4644 | struct btrfs_ordered_sum *sums; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4645 | struct btrfs_ordered_extent *ordered; |
| 4646 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4647 | int ret; |
| 4648 | u64 disk_bytenr; |
Josef Bacik | 4577b01 | 2013-09-27 09:33:09 -0400 | [diff] [blame] | 4649 | u64 new_bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4650 | LIST_HEAD(list); |
| 4651 | |
| 4652 | ordered = btrfs_lookup_ordered_extent(inode, file_pos); |
| 4653 | BUG_ON(ordered->file_offset != file_pos || ordered->len != len); |
| 4654 | |
| 4655 | disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; |
| 4656 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 4657 | disk_bytenr + len - 1, &list, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4658 | if (ret) |
| 4659 | goto out; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4660 | |
| 4661 | while (!list_empty(&list)) { |
| 4662 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); |
| 4663 | list_del_init(&sums->list); |
| 4664 | |
Josef Bacik | 4577b01 | 2013-09-27 09:33:09 -0400 | [diff] [blame] | 4665 | /* |
| 4666 | * We need to offset the new_bytenr based on where the csum is. |
| 4667 | * We need to do this because we will read in entire prealloc |
| 4668 | * extents but we may have written to say the middle of the |
| 4669 | * prealloc extent, so we need to make sure the csum goes with |
| 4670 | * the right disk offset. |
| 4671 | * |
| 4672 | * We can do this because the data reloc inode refers strictly |
| 4673 | * to the on disk bytes, so we don't have to worry about |
| 4674 | * disk_len vs real len like with real inodes since it's all |
| 4675 | * disk length. |
| 4676 | */ |
| 4677 | new_bytenr = ordered->start + (sums->bytenr - disk_bytenr); |
| 4678 | sums->bytenr = new_bytenr; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4679 | |
| 4680 | btrfs_add_ordered_sum(inode, ordered, sums); |
| 4681 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4682 | out: |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4683 | btrfs_put_ordered_extent(ordered); |
Andi Kleen | 411fc6b | 2010-10-29 15:14:31 -0400 | [diff] [blame] | 4684 | return ret; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4685 | } |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4686 | |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 4687 | int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, |
| 4688 | struct btrfs_root *root, struct extent_buffer *buf, |
| 4689 | struct extent_buffer *cow) |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4690 | { |
| 4691 | struct reloc_control *rc; |
| 4692 | struct backref_node *node; |
| 4693 | int first_cow = 0; |
| 4694 | int level; |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 4695 | int ret = 0; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4696 | |
| 4697 | rc = root->fs_info->reloc_ctl; |
| 4698 | if (!rc) |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 4699 | return 0; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4700 | |
| 4701 | BUG_ON(rc->stage == UPDATE_DATA_PTRS && |
| 4702 | root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID); |
| 4703 | |
Wang Shilong | c974c46 | 2013-12-11 19:29:51 +0800 | [diff] [blame] | 4704 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { |
| 4705 | if (buf == root->node) |
| 4706 | __update_reloc_root(root, cow->start); |
| 4707 | } |
| 4708 | |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4709 | level = btrfs_header_level(buf); |
| 4710 | if (btrfs_header_generation(buf) <= |
| 4711 | btrfs_root_last_snapshot(&root->root_item)) |
| 4712 | first_cow = 1; |
| 4713 | |
| 4714 | if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID && |
| 4715 | rc->create_reloc_tree) { |
| 4716 | WARN_ON(!first_cow && level == 0); |
| 4717 | |
| 4718 | node = rc->backref_cache.path[level]; |
| 4719 | BUG_ON(node->bytenr != buf->start && |
| 4720 | node->new_bytenr != buf->start); |
| 4721 | |
| 4722 | drop_node_buffer(node); |
| 4723 | extent_buffer_get(cow); |
| 4724 | node->eb = cow; |
| 4725 | node->new_bytenr = cow->start; |
| 4726 | |
| 4727 | if (!node->pending) { |
| 4728 | list_move_tail(&node->list, |
| 4729 | &rc->backref_cache.pending[level]); |
| 4730 | node->pending = 1; |
| 4731 | } |
| 4732 | |
| 4733 | if (first_cow) |
| 4734 | __mark_block_processed(rc, node); |
| 4735 | |
| 4736 | if (first_cow && level > 0) |
| 4737 | rc->nodes_relocated += buf->len; |
| 4738 | } |
| 4739 | |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 4740 | if (level == 0 && first_cow && rc->stage == UPDATE_DATA_PTRS) |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4741 | ret = replace_file_extents(trans, rc, root, cow); |
Josef Bacik | 83d4cfd | 2013-08-30 15:09:51 -0400 | [diff] [blame] | 4742 | return ret; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4743 | } |
| 4744 | |
| 4745 | /* |
| 4746 | * called before creating snapshot. it calculates metadata reservation |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 4747 | * required for relocating tree blocks in the snapshot |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4748 | */ |
Zhaolei | 147d256 | 2015-08-06 20:58:11 +0800 | [diff] [blame] | 4749 | void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending, |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4750 | u64 *bytes_to_reserve) |
| 4751 | { |
| 4752 | struct btrfs_root *root; |
| 4753 | struct reloc_control *rc; |
| 4754 | |
| 4755 | root = pending->root; |
| 4756 | if (!root->reloc_root) |
| 4757 | return; |
| 4758 | |
| 4759 | rc = root->fs_info->reloc_ctl; |
| 4760 | if (!rc->merge_reloc_tree) |
| 4761 | return; |
| 4762 | |
| 4763 | root = root->reloc_root; |
| 4764 | BUG_ON(btrfs_root_refs(&root->root_item) == 0); |
| 4765 | /* |
| 4766 | * relocation is in the stage of merging trees. the space |
| 4767 | * used by merging a reloc tree is twice the size of |
| 4768 | * relocated tree nodes in the worst case. half for cowing |
| 4769 | * the reloc tree, half for cowing the fs tree. the space |
| 4770 | * used by cowing the reloc tree will be freed after the |
| 4771 | * tree is dropped. if we create snapshot, cowing the fs |
| 4772 | * tree may use more space than it frees. so we need |
| 4773 | * reserve extra space. |
| 4774 | */ |
| 4775 | *bytes_to_reserve += rc->nodes_relocated; |
| 4776 | } |
| 4777 | |
| 4778 | /* |
| 4779 | * called after snapshot is created. migrate block reservation |
| 4780 | * and create reloc root for the newly created snapshot |
| 4781 | */ |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 4782 | int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4783 | struct btrfs_pending_snapshot *pending) |
| 4784 | { |
| 4785 | struct btrfs_root *root = pending->root; |
| 4786 | struct btrfs_root *reloc_root; |
| 4787 | struct btrfs_root *new_root; |
| 4788 | struct reloc_control *rc; |
| 4789 | int ret; |
| 4790 | |
| 4791 | if (!root->reloc_root) |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 4792 | return 0; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4793 | |
| 4794 | rc = root->fs_info->reloc_ctl; |
| 4795 | rc->merging_rsv_size += rc->nodes_relocated; |
| 4796 | |
| 4797 | if (rc->merge_reloc_tree) { |
| 4798 | ret = btrfs_block_rsv_migrate(&pending->block_rsv, |
| 4799 | rc->block_rsv, |
Josef Bacik | 25d609f | 2016-03-25 13:25:48 -0400 | [diff] [blame] | 4800 | rc->nodes_relocated, 1); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 4801 | if (ret) |
| 4802 | return ret; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4803 | } |
| 4804 | |
| 4805 | new_root = pending->snap; |
| 4806 | reloc_root = create_reloc_root(trans, root->reloc_root, |
| 4807 | new_root->root_key.objectid); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 4808 | if (IS_ERR(reloc_root)) |
| 4809 | return PTR_ERR(reloc_root); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4810 | |
Jeff Mahoney | ffd7b33 | 2011-10-03 23:23:15 -0400 | [diff] [blame] | 4811 | ret = __add_reloc_root(reloc_root); |
| 4812 | BUG_ON(ret < 0); |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4813 | new_root->reloc_root = reloc_root; |
| 4814 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 4815 | if (rc->create_reloc_tree) |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4816 | ret = clone_backref_node(trans, rc, root, reloc_root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 4817 | return ret; |
Yan, Zheng | 3fd0a55 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4818 | } |