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authorChris Mason <chris.mason@oracle.com>2012-01-16 15:26:31 -0500
committerChris Mason <chris.mason@oracle.com>2012-01-16 15:26:31 -0500
commit9785dbdf265ddc47d5c88267d89a97648c0dc14b (patch)
tree3a97a48d6f282f9e06c5446beeb886fcd86c4798 /fs/btrfs
parentd756bd2d9339447c29bde950910586df8f8941ec (diff)
parent6bf7e080d5bcb0d399ee38ce3dabbfad64448192 (diff)
Merge branch 'for-chris' of git://git.jan-o-sch.net/btrfs-unstable into integration
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/Makefile2
-rw-r--r--fs/btrfs/backref.c1131
-rw-r--r--fs/btrfs/backref.h5
-rw-r--r--fs/btrfs/ctree.c42
-rw-r--r--fs/btrfs/ctree.h24
-rw-r--r--fs/btrfs/delayed-ref.c153
-rw-r--r--fs/btrfs/delayed-ref.h104
-rw-r--r--fs/btrfs/disk-io.c3
-rw-r--r--fs/btrfs/extent-tree.c187
-rw-r--r--fs/btrfs/extent_io.c1
-rw-r--r--fs/btrfs/extent_io.h2
-rw-r--r--fs/btrfs/file.c10
-rw-r--r--fs/btrfs/inode.c4
-rw-r--r--fs/btrfs/ioctl.c13
-rw-r--r--fs/btrfs/locking.c53
-rw-r--r--fs/btrfs/relocation.c18
-rw-r--r--fs/btrfs/scrub.c7
-rw-r--r--fs/btrfs/transaction.c9
-rw-r--r--fs/btrfs/tree-log.c2
-rw-r--r--fs/btrfs/ulist.c220
-rw-r--r--fs/btrfs/ulist.h68
21 files changed, 1639 insertions, 419 deletions
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index c0ddfd29c5e5..70798407b9a2 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -8,6 +8,6 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
8 extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \ 8 extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \
9 export.o tree-log.o free-space-cache.o zlib.o lzo.o \ 9 export.o tree-log.o free-space-cache.o zlib.o lzo.o \
10 compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \ 10 compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \
11 reada.o backref.o 11 reada.o backref.o ulist.o
12 12
13btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o 13btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 22c64fff1bd5..b9a843226de8 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -19,18 +19,789 @@
19#include "ctree.h" 19#include "ctree.h"
20#include "disk-io.h" 20#include "disk-io.h"
21#include "backref.h" 21#include "backref.h"
22#include "ulist.h"
23#include "transaction.h"
24#include "delayed-ref.h"
22 25
23struct __data_ref { 26/*
27 * this structure records all encountered refs on the way up to the root
28 */
29struct __prelim_ref {
24 struct list_head list; 30 struct list_head list;
25 u64 inum; 31 u64 root_id;
26 u64 root; 32 struct btrfs_key key;
27 u64 extent_data_item_offset; 33 int level;
34 int count;
35 u64 parent;
36 u64 wanted_disk_byte;
28}; 37};
29 38
30struct __shared_ref { 39static int __add_prelim_ref(struct list_head *head, u64 root_id,
31 struct list_head list; 40 struct btrfs_key *key, int level, u64 parent,
41 u64 wanted_disk_byte, int count)
42{
43 struct __prelim_ref *ref;
44
45 /* in case we're adding delayed refs, we're holding the refs spinlock */
46 ref = kmalloc(sizeof(*ref), GFP_ATOMIC);
47 if (!ref)
48 return -ENOMEM;
49
50 ref->root_id = root_id;
51 if (key)
52 ref->key = *key;
53 else
54 memset(&ref->key, 0, sizeof(ref->key));
55
56 ref->level = level;
57 ref->count = count;
58 ref->parent = parent;
59 ref->wanted_disk_byte = wanted_disk_byte;
60 list_add_tail(&ref->list, head);
61
62 return 0;
63}
64
65static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path,
66 struct ulist *parents,
67 struct extent_buffer *eb, int level,
68 u64 wanted_objectid, u64 wanted_disk_byte)
69{
70 int ret;
71 int slot;
72 struct btrfs_file_extent_item *fi;
73 struct btrfs_key key;
32 u64 disk_byte; 74 u64 disk_byte;
33}; 75
76add_parent:
77 ret = ulist_add(parents, eb->start, 0, GFP_NOFS);
78 if (ret < 0)
79 return ret;
80
81 if (level != 0)
82 return 0;
83
84 /*
85 * if the current leaf is full with EXTENT_DATA items, we must
86 * check the next one if that holds a reference as well.
87 * ref->count cannot be used to skip this check.
88 * repeat this until we don't find any additional EXTENT_DATA items.
89 */
90 while (1) {
91 ret = btrfs_next_leaf(root, path);
92 if (ret < 0)
93 return ret;
94 if (ret)
95 return 0;
96
97 eb = path->nodes[0];
98 for (slot = 0; slot < btrfs_header_nritems(eb); ++slot) {
99 btrfs_item_key_to_cpu(eb, &key, slot);
100 if (key.objectid != wanted_objectid ||
101 key.type != BTRFS_EXTENT_DATA_KEY)
102 return 0;
103 fi = btrfs_item_ptr(eb, slot,
104 struct btrfs_file_extent_item);
105 disk_byte = btrfs_file_extent_disk_bytenr(eb, fi);
106 if (disk_byte == wanted_disk_byte)
107 goto add_parent;
108 }
109 }
110
111 return 0;
112}
113
114/*
115 * resolve an indirect backref in the form (root_id, key, level)
116 * to a logical address
117 */
118static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
119 struct __prelim_ref *ref,
120 struct ulist *parents)
121{
122 struct btrfs_path *path;
123 struct btrfs_root *root;
124 struct btrfs_key root_key;
125 struct btrfs_key key = {0};
126 struct extent_buffer *eb;
127 int ret = 0;
128 int root_level;
129 int level = ref->level;
130
131 path = btrfs_alloc_path();
132 if (!path)
133 return -ENOMEM;
134
135 root_key.objectid = ref->root_id;
136 root_key.type = BTRFS_ROOT_ITEM_KEY;
137 root_key.offset = (u64)-1;
138 root = btrfs_read_fs_root_no_name(fs_info, &root_key);
139 if (IS_ERR(root)) {
140 ret = PTR_ERR(root);
141 goto out;
142 }
143
144 rcu_read_lock();
145 root_level = btrfs_header_level(root->node);
146 rcu_read_unlock();
147
148 if (root_level + 1 == level)
149 goto out;
150
151 path->lowest_level = level;
152 ret = btrfs_search_slot(NULL, root, &ref->key, path, 0, 0);
153 pr_debug("search slot in root %llu (level %d, ref count %d) returned "
154 "%d for key (%llu %u %llu)\n",
155 (unsigned long long)ref->root_id, level, ref->count, ret,
156 (unsigned long long)ref->key.objectid, ref->key.type,
157 (unsigned long long)ref->key.offset);
158 if (ret < 0)
159 goto out;
160
161 eb = path->nodes[level];
162 if (!eb) {
163 WARN_ON(1);
164 ret = 1;
165 goto out;
166 }
167
168 if (level == 0) {
169 if (ret == 1 && path->slots[0] >= btrfs_header_nritems(eb)) {
170 ret = btrfs_next_leaf(root, path);
171 if (ret)
172 goto out;
173 eb = path->nodes[0];
174 }
175
176 btrfs_item_key_to_cpu(eb, &key, path->slots[0]);
177 }
178
179 /* the last two parameters will only be used for level == 0 */
180 ret = add_all_parents(root, path, parents, eb, level, key.objectid,
181 ref->wanted_disk_byte);
182out:
183 btrfs_free_path(path);
184 return ret;
185}
186
187/*
188 * resolve all indirect backrefs from the list
189 */
190static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
191 struct list_head *head)
192{
193 int err;
194 int ret = 0;
195 struct __prelim_ref *ref;
196 struct __prelim_ref *ref_safe;
197 struct __prelim_ref *new_ref;
198 struct ulist *parents;
199 struct ulist_node *node;
200
201 parents = ulist_alloc(GFP_NOFS);
202 if (!parents)
203 return -ENOMEM;
204
205 /*
206 * _safe allows us to insert directly after the current item without
207 * iterating over the newly inserted items.
208 * we're also allowed to re-assign ref during iteration.
209 */
210 list_for_each_entry_safe(ref, ref_safe, head, list) {
211 if (ref->parent) /* already direct */
212 continue;
213 if (ref->count == 0)
214 continue;
215 err = __resolve_indirect_ref(fs_info, ref, parents);
216 if (err) {
217 if (ret == 0)
218 ret = err;
219 continue;
220 }
221
222 /* we put the first parent into the ref at hand */
223 node = ulist_next(parents, NULL);
224 ref->parent = node ? node->val : 0;
225
226 /* additional parents require new refs being added here */
227 while ((node = ulist_next(parents, node))) {
228 new_ref = kmalloc(sizeof(*new_ref), GFP_NOFS);
229 if (!new_ref) {
230 ret = -ENOMEM;
231 break;
232 }
233 memcpy(new_ref, ref, sizeof(*ref));
234 new_ref->parent = node->val;
235 list_add(&new_ref->list, &ref->list);
236 }
237 ulist_reinit(parents);
238 }
239
240 ulist_free(parents);
241 return ret;
242}
243
244/*
245 * merge two lists of backrefs and adjust counts accordingly
246 *
247 * mode = 1: merge identical keys, if key is set
248 * mode = 2: merge identical parents
249 */
250static int __merge_refs(struct list_head *head, int mode)
251{
252 struct list_head *pos1;
253
254 list_for_each(pos1, head) {
255 struct list_head *n2;
256 struct list_head *pos2;
257 struct __prelim_ref *ref1;
258
259 ref1 = list_entry(pos1, struct __prelim_ref, list);
260
261 if (mode == 1 && ref1->key.type == 0)
262 continue;
263 for (pos2 = pos1->next, n2 = pos2->next; pos2 != head;
264 pos2 = n2, n2 = pos2->next) {
265 struct __prelim_ref *ref2;
266
267 ref2 = list_entry(pos2, struct __prelim_ref, list);
268
269 if (mode == 1) {
270 if (memcmp(&ref1->key, &ref2->key,
271 sizeof(ref1->key)) ||
272 ref1->level != ref2->level ||
273 ref1->root_id != ref2->root_id)
274 continue;
275 ref1->count += ref2->count;
276 } else {
277 if (ref1->parent != ref2->parent)
278 continue;
279 ref1->count += ref2->count;
280 }
281 list_del(&ref2->list);
282 kfree(ref2);
283 }
284
285 }
286 return 0;
287}
288
289/*
290 * add all currently queued delayed refs from this head whose seq nr is
291 * smaller or equal that seq to the list
292 */
293static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
294 struct btrfs_key *info_key,
295 struct list_head *prefs)
296{
297 struct btrfs_delayed_extent_op *extent_op = head->extent_op;
298 struct rb_node *n = &head->node.rb_node;
299 int sgn;
300 int ret;
301
302 if (extent_op && extent_op->update_key)
303 btrfs_disk_key_to_cpu(info_key, &extent_op->key);
304
305 while ((n = rb_prev(n))) {
306 struct btrfs_delayed_ref_node *node;
307 node = rb_entry(n, struct btrfs_delayed_ref_node,
308 rb_node);
309 if (node->bytenr != head->node.bytenr)
310 break;
311 WARN_ON(node->is_head);
312
313 if (node->seq > seq)
314 continue;
315
316 switch (node->action) {
317 case BTRFS_ADD_DELAYED_EXTENT:
318 case BTRFS_UPDATE_DELAYED_HEAD:
319 WARN_ON(1);
320 continue;
321 case BTRFS_ADD_DELAYED_REF:
322 sgn = 1;
323 break;
324 case BTRFS_DROP_DELAYED_REF:
325 sgn = -1;
326 break;
327 default:
328 BUG_ON(1);
329 }
330 switch (node->type) {
331 case BTRFS_TREE_BLOCK_REF_KEY: {
332 struct btrfs_delayed_tree_ref *ref;
333
334 ref = btrfs_delayed_node_to_tree_ref(node);
335 ret = __add_prelim_ref(prefs, ref->root, info_key,
336 ref->level + 1, 0, node->bytenr,
337 node->ref_mod * sgn);
338 break;
339 }
340 case BTRFS_SHARED_BLOCK_REF_KEY: {
341 struct btrfs_delayed_tree_ref *ref;
342
343 ref = btrfs_delayed_node_to_tree_ref(node);
344 ret = __add_prelim_ref(prefs, ref->root, info_key,
345 ref->level + 1, ref->parent,
346 node->bytenr,
347 node->ref_mod * sgn);
348 break;
349 }
350 case BTRFS_EXTENT_DATA_REF_KEY: {
351 struct btrfs_delayed_data_ref *ref;
352 struct btrfs_key key;
353
354 ref = btrfs_delayed_node_to_data_ref(node);
355
356 key.objectid = ref->objectid;
357 key.type = BTRFS_EXTENT_DATA_KEY;
358 key.offset = ref->offset;
359 ret = __add_prelim_ref(prefs, ref->root, &key, 0, 0,
360 node->bytenr,
361 node->ref_mod * sgn);
362 break;
363 }
364 case BTRFS_SHARED_DATA_REF_KEY: {
365 struct btrfs_delayed_data_ref *ref;
366 struct btrfs_key key;
367
368 ref = btrfs_delayed_node_to_data_ref(node);
369
370 key.objectid = ref->objectid;
371 key.type = BTRFS_EXTENT_DATA_KEY;
372 key.offset = ref->offset;
373 ret = __add_prelim_ref(prefs, ref->root, &key, 0,
374 ref->parent, node->bytenr,
375 node->ref_mod * sgn);
376 break;
377 }
378 default:
379 WARN_ON(1);
380 }
381 BUG_ON(ret);
382 }
383
384 return 0;
385}
386
387/*
388 * add all inline backrefs for bytenr to the list
389 */
390static int __add_inline_refs(struct btrfs_fs_info *fs_info,
391 struct btrfs_path *path, u64 bytenr,
392 struct btrfs_key *info_key, int *info_level,
393 struct list_head *prefs)
394{
395 int ret;
396 int slot;
397 struct extent_buffer *leaf;
398 struct btrfs_key key;
399 unsigned long ptr;
400 unsigned long end;
401 struct btrfs_extent_item *ei;
402 u64 flags;
403 u64 item_size;
404
405 /*
406 * enumerate all inline refs
407 */
408 leaf = path->nodes[0];
409 slot = path->slots[0] - 1;
410
411 item_size = btrfs_item_size_nr(leaf, slot);
412 BUG_ON(item_size < sizeof(*ei));
413
414 ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item);
415 flags = btrfs_extent_flags(leaf, ei);
416
417 ptr = (unsigned long)(ei + 1);
418 end = (unsigned long)ei + item_size;
419
420 if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
421 struct btrfs_tree_block_info *info;
422 struct btrfs_disk_key disk_key;
423
424 info = (struct btrfs_tree_block_info *)ptr;
425 *info_level = btrfs_tree_block_level(leaf, info);
426 btrfs_tree_block_key(leaf, info, &disk_key);
427 btrfs_disk_key_to_cpu(info_key, &disk_key);
428 ptr += sizeof(struct btrfs_tree_block_info);
429 BUG_ON(ptr > end);
430 } else {
431 BUG_ON(!(flags & BTRFS_EXTENT_FLAG_DATA));
432 }
433
434 while (ptr < end) {
435 struct btrfs_extent_inline_ref *iref;
436 u64 offset;
437 int type;
438
439 iref = (struct btrfs_extent_inline_ref *)ptr;
440 type = btrfs_extent_inline_ref_type(leaf, iref);
441 offset = btrfs_extent_inline_ref_offset(leaf, iref);
442
443 switch (type) {
444 case BTRFS_SHARED_BLOCK_REF_KEY:
445 ret = __add_prelim_ref(prefs, 0, info_key,
446 *info_level + 1, offset,
447 bytenr, 1);
448 break;
449 case BTRFS_SHARED_DATA_REF_KEY: {
450 struct btrfs_shared_data_ref *sdref;
451 int count;
452
453 sdref = (struct btrfs_shared_data_ref *)(iref + 1);
454 count = btrfs_shared_data_ref_count(leaf, sdref);
455 ret = __add_prelim_ref(prefs, 0, NULL, 0, offset,
456 bytenr, count);
457 break;
458 }
459 case BTRFS_TREE_BLOCK_REF_KEY:
460 ret = __add_prelim_ref(prefs, offset, info_key,
461 *info_level + 1, 0, bytenr, 1);
462 break;
463 case BTRFS_EXTENT_DATA_REF_KEY: {
464 struct btrfs_extent_data_ref *dref;
465 int count;
466 u64 root;
467
468 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
469 count = btrfs_extent_data_ref_count(leaf, dref);
470 key.objectid = btrfs_extent_data_ref_objectid(leaf,
471 dref);
472 key.type = BTRFS_EXTENT_DATA_KEY;
473 key.offset = btrfs_extent_data_ref_offset(leaf, dref);
474 root = btrfs_extent_data_ref_root(leaf, dref);
475 ret = __add_prelim_ref(prefs, root, &key, 0, 0, bytenr,
476 count);
477 break;
478 }
479 default:
480 WARN_ON(1);
481 }
482 BUG_ON(ret);
483 ptr += btrfs_extent_inline_ref_size(type);
484 }
485
486 return 0;
487}
488
489/*
490 * add all non-inline backrefs for bytenr to the list
491 */
492static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
493 struct btrfs_path *path, u64 bytenr,
494 struct btrfs_key *info_key, int info_level,
495 struct list_head *prefs)
496{
497 struct btrfs_root *extent_root = fs_info->extent_root;
498 int ret;
499 int slot;
500 struct extent_buffer *leaf;
501 struct btrfs_key key;
502
503 while (1) {
504 ret = btrfs_next_item(extent_root, path);
505 if (ret < 0)
506 break;
507 if (ret) {
508 ret = 0;
509 break;
510 }
511
512 slot = path->slots[0];
513 leaf = path->nodes[0];
514 btrfs_item_key_to_cpu(leaf, &key, slot);
515
516 if (key.objectid != bytenr)
517 break;
518 if (key.type < BTRFS_TREE_BLOCK_REF_KEY)
519 continue;
520 if (key.type > BTRFS_SHARED_DATA_REF_KEY)
521 break;
522
523 switch (key.type) {
524 case BTRFS_SHARED_BLOCK_REF_KEY:
525 ret = __add_prelim_ref(prefs, 0, info_key,
526 info_level + 1, key.offset,
527 bytenr, 1);
528 break;
529 case BTRFS_SHARED_DATA_REF_KEY: {
530 struct btrfs_shared_data_ref *sdref;
531 int count;
532
533 sdref = btrfs_item_ptr(leaf, slot,
534 struct btrfs_shared_data_ref);
535 count = btrfs_shared_data_ref_count(leaf, sdref);
536 ret = __add_prelim_ref(prefs, 0, NULL, 0, key.offset,
537 bytenr, count);
538 break;
539 }
540 case BTRFS_TREE_BLOCK_REF_KEY:
541 ret = __add_prelim_ref(prefs, key.offset, info_key,
542 info_level + 1, 0, bytenr, 1);
543 break;
544 case BTRFS_EXTENT_DATA_REF_KEY: {
545 struct btrfs_extent_data_ref *dref;
546 int count;
547 u64 root;
548
549 dref = btrfs_item_ptr(leaf, slot,
550 struct btrfs_extent_data_ref);
551 count = btrfs_extent_data_ref_count(leaf, dref);
552 key.objectid = btrfs_extent_data_ref_objectid(leaf,
553 dref);
554 key.type = BTRFS_EXTENT_DATA_KEY;
555 key.offset = btrfs_extent_data_ref_offset(leaf, dref);
556 root = btrfs_extent_data_ref_root(leaf, dref);
557 ret = __add_prelim_ref(prefs, root, &key, 0, 0,
558 bytenr, count);
559 break;
560 }
561 default:
562 WARN_ON(1);
563 }
564 BUG_ON(ret);
565 }
566
567 return ret;
568}
569
570/*
571 * this adds all existing backrefs (inline backrefs, backrefs and delayed
572 * refs) for the given bytenr to the refs list, merges duplicates and resolves
573 * indirect refs to their parent bytenr.
574 * When roots are found, they're added to the roots list
575 *
576 * FIXME some caching might speed things up
577 */
578static int find_parent_nodes(struct btrfs_trans_handle *trans,
579 struct btrfs_fs_info *fs_info, u64 bytenr,
580 u64 seq, struct ulist *refs, struct ulist *roots)
581{
582 struct btrfs_key key;
583 struct btrfs_path *path;
584 struct btrfs_key info_key = { 0 };
585 struct btrfs_delayed_ref_root *delayed_refs = NULL;
586 struct btrfs_delayed_ref_head *head = NULL;
587 int info_level = 0;
588 int ret;
589 struct list_head prefs_delayed;
590 struct list_head prefs;
591 struct __prelim_ref *ref;
592
593 INIT_LIST_HEAD(&prefs);
594 INIT_LIST_HEAD(&prefs_delayed);
595
596 key.objectid = bytenr;
597 key.type = BTRFS_EXTENT_ITEM_KEY;
598 key.offset = (u64)-1;
599
600 path = btrfs_alloc_path();
601 if (!path)
602 return -ENOMEM;
603
604 /*
605 * grab both a lock on the path and a lock on the delayed ref head.
606 * We need both to get a consistent picture of how the refs look
607 * at a specified point in time
608 */
609again:
610 ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0);
611 if (ret < 0)
612 goto out;
613 BUG_ON(ret == 0);
614
615 /*
616 * look if there are updates for this ref queued and lock the head
617 */
618 delayed_refs = &trans->transaction->delayed_refs;
619 spin_lock(&delayed_refs->lock);
620 head = btrfs_find_delayed_ref_head(trans, bytenr);
621 if (head) {
622 if (!mutex_trylock(&head->mutex)) {
623 atomic_inc(&head->node.refs);
624 spin_unlock(&delayed_refs->lock);
625
626 btrfs_release_path(path);
627
628 /*
629 * Mutex was contended, block until it's
630 * released and try again
631 */
632 mutex_lock(&head->mutex);
633 mutex_unlock(&head->mutex);
634 btrfs_put_delayed_ref(&head->node);
635 goto again;
636 }
637 ret = __add_delayed_refs(head, seq, &info_key, &prefs_delayed);
638 if (ret)
639 goto out;
640 }
641 spin_unlock(&delayed_refs->lock);
642
643 if (path->slots[0]) {
644 struct extent_buffer *leaf;
645 int slot;
646
647 leaf = path->nodes[0];
648 slot = path->slots[0] - 1;
649 btrfs_item_key_to_cpu(leaf, &key, slot);
650 if (key.objectid == bytenr &&
651 key.type == BTRFS_EXTENT_ITEM_KEY) {
652 ret = __add_inline_refs(fs_info, path, bytenr,
653 &info_key, &info_level, &prefs);
654 if (ret)
655 goto out;
656 ret = __add_keyed_refs(fs_info, path, bytenr, &info_key,
657 info_level, &prefs);
658 if (ret)
659 goto out;
660 }
661 }
662 btrfs_release_path(path);
663
664 /*
665 * when adding the delayed refs above, the info_key might not have
666 * been known yet. Go over the list and replace the missing keys
667 */
668 list_for_each_entry(ref, &prefs_delayed, list) {
669 if ((ref->key.offset | ref->key.type | ref->key.objectid) == 0)
670 memcpy(&ref->key, &info_key, sizeof(ref->key));
671 }
672 list_splice_init(&prefs_delayed, &prefs);
673
674 ret = __merge_refs(&prefs, 1);
675 if (ret)
676 goto out;
677
678 ret = __resolve_indirect_refs(fs_info, &prefs);
679 if (ret)
680 goto out;
681
682 ret = __merge_refs(&prefs, 2);
683 if (ret)
684 goto out;
685
686 while (!list_empty(&prefs)) {
687 ref = list_first_entry(&prefs, struct __prelim_ref, list);
688 list_del(&ref->list);
689 if (ref->count < 0)
690 WARN_ON(1);
691 if (ref->count && ref->root_id && ref->parent == 0) {
692 /* no parent == root of tree */
693 ret = ulist_add(roots, ref->root_id, 0, GFP_NOFS);
694 BUG_ON(ret < 0);
695 }
696 if (ref->count && ref->parent) {
697 ret = ulist_add(refs, ref->parent, 0, GFP_NOFS);
698 BUG_ON(ret < 0);
699 }
700 kfree(ref);
701 }
702
703out:
704 if (head)
705 mutex_unlock(&head->mutex);
706 btrfs_free_path(path);
707 while (!list_empty(&prefs)) {
708 ref = list_first_entry(&prefs, struct __prelim_ref, list);
709 list_del(&ref->list);
710 kfree(ref);
711 }
712 while (!list_empty(&prefs_delayed)) {
713 ref = list_first_entry(&prefs_delayed, struct __prelim_ref,
714 list);
715 list_del(&ref->list);
716 kfree(ref);
717 }
718
719 return ret;
720}
721
722/*
723 * Finds all leafs with a reference to the specified combination of bytenr and
724 * offset. key_list_head will point to a list of corresponding keys (caller must
725 * free each list element). The leafs will be stored in the leafs ulist, which
726 * must be freed with ulist_free.
727 *
728 * returns 0 on success, <0 on error
729 */
730static int btrfs_find_all_leafs(struct btrfs_trans_handle *trans,
731 struct btrfs_fs_info *fs_info, u64 bytenr,
732 u64 num_bytes, u64 seq, struct ulist **leafs)
733{
734 struct ulist *tmp;
735 int ret;
736
737 tmp = ulist_alloc(GFP_NOFS);
738 if (!tmp)
739 return -ENOMEM;
740 *leafs = ulist_alloc(GFP_NOFS);
741 if (!*leafs) {
742 ulist_free(tmp);
743 return -ENOMEM;
744 }
745
746 ret = find_parent_nodes(trans, fs_info, bytenr, seq, *leafs, tmp);
747 ulist_free(tmp);
748
749 if (ret < 0 && ret != -ENOENT) {
750 ulist_free(*leafs);
751 return ret;
752 }
753
754 return 0;
755}
756
757/*
758 * walk all backrefs for a given extent to find all roots that reference this
759 * extent. Walking a backref means finding all extents that reference this
760 * extent and in turn walk the backrefs of those, too. Naturally this is a
761 * recursive process, but here it is implemented in an iterative fashion: We
762 * find all referencing extents for the extent in question and put them on a
763 * list. In turn, we find all referencing extents for those, further appending
764 * to the list. The way we iterate the list allows adding more elements after
765 * the current while iterating. The process stops when we reach the end of the
766 * list. Found roots are added to the roots list.
767 *
768 * returns 0 on success, < 0 on error.
769 */
770int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
771 struct btrfs_fs_info *fs_info, u64 bytenr,
772 u64 num_bytes, u64 seq, struct ulist **roots)
773{
774 struct ulist *tmp;
775 struct ulist_node *node = NULL;
776 int ret;
777
778 tmp = ulist_alloc(GFP_NOFS);
779 if (!tmp)
780 return -ENOMEM;
781 *roots = ulist_alloc(GFP_NOFS);
782 if (!*roots) {
783 ulist_free(tmp);
784 return -ENOMEM;
785 }
786
787 while (1) {
788 ret = find_parent_nodes(trans, fs_info, bytenr, seq,
789 tmp, *roots);
790 if (ret < 0 && ret != -ENOENT) {
791 ulist_free(tmp);
792 ulist_free(*roots);
793 return ret;
794 }
795 node = ulist_next(tmp, node);
796 if (!node)
797 break;
798 bytenr = node->val;
799 }
800
801 ulist_free(tmp);
802 return 0;
803}
804
34 805
35static int __inode_info(u64 inum, u64 ioff, u8 key_type, 806static int __inode_info(u64 inum, u64 ioff, u8 key_type,
36 struct btrfs_root *fs_root, struct btrfs_path *path, 807 struct btrfs_root *fs_root, struct btrfs_path *path,
@@ -181,8 +952,11 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
181 btrfs_item_key_to_cpu(path->nodes[0], found_key, path->slots[0]); 952 btrfs_item_key_to_cpu(path->nodes[0], found_key, path->slots[0]);
182 if (found_key->type != BTRFS_EXTENT_ITEM_KEY || 953 if (found_key->type != BTRFS_EXTENT_ITEM_KEY ||
183 found_key->objectid > logical || 954 found_key->objectid > logical ||
184 found_key->objectid + found_key->offset <= logical) 955 found_key->objectid + found_key->offset <= logical) {
956 pr_debug("logical %llu is not within any extent\n",
957 (unsigned long long)logical);
185 return -ENOENT; 958 return -ENOENT;
959 }
186 960
187 eb = path->nodes[0]; 961 eb = path->nodes[0];
188 item_size = btrfs_item_size_nr(eb, path->slots[0]); 962 item_size = btrfs_item_size_nr(eb, path->slots[0]);
@@ -191,6 +965,13 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
191 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); 965 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item);
192 flags = btrfs_extent_flags(eb, ei); 966 flags = btrfs_extent_flags(eb, ei);
193 967
968 pr_debug("logical %llu is at position %llu within the extent (%llu "
969 "EXTENT_ITEM %llu) flags %#llx size %u\n",
970 (unsigned long long)logical,
971 (unsigned long long)(logical - found_key->objectid),
972 (unsigned long long)found_key->objectid,
973 (unsigned long long)found_key->offset,
974 (unsigned long long)flags, item_size);
194 if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) 975 if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)
195 return BTRFS_EXTENT_FLAG_TREE_BLOCK; 976 return BTRFS_EXTENT_FLAG_TREE_BLOCK;
196 if (flags & BTRFS_EXTENT_FLAG_DATA) 977 if (flags & BTRFS_EXTENT_FLAG_DATA)
@@ -287,128 +1068,11 @@ int tree_backref_for_extent(unsigned long *ptr, struct extent_buffer *eb,
287 return 0; 1068 return 0;
288} 1069}
289 1070
290static int __data_list_add(struct list_head *head, u64 inum, 1071static int iterate_leaf_refs(struct btrfs_fs_info *fs_info,
291 u64 extent_data_item_offset, u64 root) 1072 struct btrfs_path *path, u64 logical,
292{ 1073 u64 orig_extent_item_objectid,
293 struct __data_ref *ref; 1074 u64 extent_item_pos, u64 root,
294 1075 iterate_extent_inodes_t *iterate, void *ctx)
295 ref = kmalloc(sizeof(*ref), GFP_NOFS);
296 if (!ref)
297 return -ENOMEM;
298
299 ref->inum = inum;
300 ref->extent_data_item_offset = extent_data_item_offset;
301 ref->root = root;
302 list_add_tail(&ref->list, head);
303
304 return 0;
305}
306
307static int __data_list_add_eb(struct list_head *head, struct extent_buffer *eb,
308 struct btrfs_extent_data_ref *dref)
309{
310 return __data_list_add(head, btrfs_extent_data_ref_objectid(eb, dref),
311 btrfs_extent_data_ref_offset(eb, dref),
312 btrfs_extent_data_ref_root(eb, dref));
313}
314
315static int __shared_list_add(struct list_head *head, u64 disk_byte)
316{
317 struct __shared_ref *ref;
318
319 ref = kmalloc(sizeof(*ref), GFP_NOFS);
320 if (!ref)
321 return -ENOMEM;
322
323 ref->disk_byte = disk_byte;
324 list_add_tail(&ref->list, head);
325
326 return 0;
327}
328
329static int __iter_shared_inline_ref_inodes(struct btrfs_fs_info *fs_info,
330 u64 logical, u64 inum,
331 u64 extent_data_item_offset,
332 u64 extent_offset,
333 struct btrfs_path *path,
334 struct list_head *data_refs,
335 iterate_extent_inodes_t *iterate,
336 void *ctx)
337{
338 u64 ref_root;
339 u32 item_size;
340 struct btrfs_key key;
341 struct extent_buffer *eb;
342 struct btrfs_extent_item *ei;
343 struct btrfs_extent_inline_ref *eiref;
344 struct __data_ref *ref;
345 int ret;
346 int type;
347 int last;
348 unsigned long ptr = 0;
349
350 WARN_ON(!list_empty(data_refs));
351 ret = extent_from_logical(fs_info, logical, path, &key);
352 if (ret & BTRFS_EXTENT_FLAG_DATA)
353 ret = -EIO;
354 if (ret < 0)
355 goto out;
356
357 eb = path->nodes[0];
358 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item);
359 item_size = btrfs_item_size_nr(eb, path->slots[0]);
360
361 ret = 0;
362 ref_root = 0;
363 /*
364 * as done in iterate_extent_inodes, we first build a list of refs to
365 * iterate, then free the path and then iterate them to avoid deadlocks.
366 */
367 do {
368 last = __get_extent_inline_ref(&ptr, eb, ei, item_size,
369 &eiref, &type);
370 if (last < 0) {
371 ret = last;
372 goto out;
373 }
374 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
375 type == BTRFS_SHARED_BLOCK_REF_KEY) {
376 ref_root = btrfs_extent_inline_ref_offset(eb, eiref);
377 ret = __data_list_add(data_refs, inum,
378 extent_data_item_offset,
379 ref_root);
380 }
381 } while (!ret && !last);
382
383 btrfs_release_path(path);
384
385 if (ref_root == 0) {
386 printk(KERN_ERR "btrfs: failed to find tree block ref "
387 "for shared data backref %llu\n", logical);
388 WARN_ON(1);
389 ret = -EIO;
390 }
391
392out:
393 while (!list_empty(data_refs)) {
394 ref = list_first_entry(data_refs, struct __data_ref, list);
395 list_del(&ref->list);
396 if (!ret)
397 ret = iterate(ref->inum, extent_offset +
398 ref->extent_data_item_offset,
399 ref->root, ctx);
400 kfree(ref);
401 }
402
403 return ret;
404}
405
406static int __iter_shared_inline_ref(struct btrfs_fs_info *fs_info,
407 u64 logical, u64 orig_extent_item_objectid,
408 u64 extent_offset, struct btrfs_path *path,
409 struct list_head *data_refs,
410 iterate_extent_inodes_t *iterate,
411 void *ctx)
412{ 1076{
413 u64 disk_byte; 1077 u64 disk_byte;
414 struct btrfs_key key; 1078 struct btrfs_key key;
@@ -416,8 +1080,10 @@ static int __iter_shared_inline_ref(struct btrfs_fs_info *fs_info,
416 struct extent_buffer *eb; 1080 struct extent_buffer *eb;
417 int slot; 1081 int slot;
418 int nritems; 1082 int nritems;
419 int ret; 1083 int ret = 0;
420 int found = 0; 1084 int extent_type;
1085 u64 data_offset;
1086 u64 data_len;
421 1087
422 eb = read_tree_block(fs_info->tree_root, logical, 1088 eb = read_tree_block(fs_info->tree_root, logical,
423 fs_info->tree_root->leafsize, 0); 1089 fs_info->tree_root->leafsize, 0);
@@ -435,149 +1101,99 @@ static int __iter_shared_inline_ref(struct btrfs_fs_info *fs_info,
435 if (key.type != BTRFS_EXTENT_DATA_KEY) 1101 if (key.type != BTRFS_EXTENT_DATA_KEY)
436 continue; 1102 continue;
437 fi = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); 1103 fi = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item);
438 if (!fi) { 1104 extent_type = btrfs_file_extent_type(eb, fi);
439 free_extent_buffer(eb); 1105 if (extent_type == BTRFS_FILE_EXTENT_INLINE)
440 return -EIO; 1106 continue;
441 } 1107 /* don't skip BTRFS_FILE_EXTENT_PREALLOC, we can handle that */
442 disk_byte = btrfs_file_extent_disk_bytenr(eb, fi); 1108 disk_byte = btrfs_file_extent_disk_bytenr(eb, fi);
443 if (disk_byte != orig_extent_item_objectid) { 1109 if (disk_byte != orig_extent_item_objectid)
444 if (found) 1110 continue;
445 break;
446 else
447 continue;
448 }
449 ++found;
450 ret = __iter_shared_inline_ref_inodes(fs_info, logical,
451 key.objectid,
452 key.offset,
453 extent_offset, path,
454 data_refs,
455 iterate, ctx);
456 if (ret)
457 break;
458 }
459 1111
460 if (!found) { 1112 data_offset = btrfs_file_extent_offset(eb, fi);
461 printk(KERN_ERR "btrfs: failed to follow shared data backref " 1113 data_len = btrfs_file_extent_num_bytes(eb, fi);
462 "to parent %llu\n", logical); 1114
463 WARN_ON(1); 1115 if (extent_item_pos < data_offset ||
464 ret = -EIO; 1116 extent_item_pos >= data_offset + data_len)
1117 continue;
1118
1119 pr_debug("ref for %llu resolved, key (%llu EXTEND_DATA %llu), "
1120 "root %llu\n", orig_extent_item_objectid,
1121 key.objectid, key.offset, root);
1122 ret = iterate(key.objectid,
1123 key.offset + (extent_item_pos - data_offset),
1124 root, ctx);
1125 if (ret) {
1126 pr_debug("stopping iteration because ret=%d\n", ret);
1127 break;
1128 }
465 } 1129 }
466 1130
467 free_extent_buffer(eb); 1131 free_extent_buffer(eb);
1132
468 return ret; 1133 return ret;
469} 1134}
470 1135
471/* 1136/*
472 * calls iterate() for every inode that references the extent identified by 1137 * calls iterate() for every inode that references the extent identified by
473 * the given parameters. will use the path given as a parameter and return it 1138 * the given parameters.
474 * released.
475 * when the iterator function returns a non-zero value, iteration stops. 1139 * when the iterator function returns a non-zero value, iteration stops.
1140 * path is guaranteed to be in released state when iterate() is called.
476 */ 1141 */
477int iterate_extent_inodes(struct btrfs_fs_info *fs_info, 1142int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
478 struct btrfs_path *path, 1143 struct btrfs_path *path,
479 u64 extent_item_objectid, 1144 u64 extent_item_objectid, u64 extent_item_pos,
480 u64 extent_offset,
481 iterate_extent_inodes_t *iterate, void *ctx) 1145 iterate_extent_inodes_t *iterate, void *ctx)
482{ 1146{
483 unsigned long ptr = 0;
484 int last;
485 int ret; 1147 int ret;
486 int type;
487 u64 logical;
488 u32 item_size;
489 struct btrfs_extent_inline_ref *eiref;
490 struct btrfs_extent_data_ref *dref;
491 struct extent_buffer *eb;
492 struct btrfs_extent_item *ei;
493 struct btrfs_key key;
494 struct list_head data_refs = LIST_HEAD_INIT(data_refs); 1148 struct list_head data_refs = LIST_HEAD_INIT(data_refs);
495 struct list_head shared_refs = LIST_HEAD_INIT(shared_refs); 1149 struct list_head shared_refs = LIST_HEAD_INIT(shared_refs);
496 struct __data_ref *ref_d; 1150 struct btrfs_trans_handle *trans;
497 struct __shared_ref *ref_s; 1151 struct ulist *refs;
498 1152 struct ulist *roots;
499 eb = path->nodes[0]; 1153 struct ulist_node *ref_node = NULL;
500 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); 1154 struct ulist_node *root_node = NULL;
501 item_size = btrfs_item_size_nr(eb, path->slots[0]); 1155 struct seq_list seq_elem;
502 1156 struct btrfs_delayed_ref_root *delayed_refs;
503 /* first we iterate the inline refs, ... */ 1157
504 do { 1158 trans = btrfs_join_transaction(fs_info->extent_root);
505 last = __get_extent_inline_ref(&ptr, eb, ei, item_size, 1159 if (IS_ERR(trans))
506 &eiref, &type); 1160 return PTR_ERR(trans);
507 if (last == -ENOENT) { 1161
508 ret = 0; 1162 pr_debug("resolving all inodes for extent %llu\n",
509 break; 1163 extent_item_objectid);
510 } 1164
511 if (last < 0) { 1165 delayed_refs = &trans->transaction->delayed_refs;
512 ret = last; 1166 spin_lock(&delayed_refs->lock);
513 break; 1167 btrfs_get_delayed_seq(delayed_refs, &seq_elem);
514 } 1168 spin_unlock(&delayed_refs->lock);
1169
1170 ret = btrfs_find_all_leafs(trans, fs_info, extent_item_objectid,
1171 extent_item_pos, seq_elem.seq,
1172 &refs);
515 1173
516 if (type == BTRFS_EXTENT_DATA_REF_KEY) { 1174 if (ret)
517 dref = (struct btrfs_extent_data_ref *)(&eiref->offset); 1175 goto out;
518 ret = __data_list_add_eb(&data_refs, eb, dref);
519 } else if (type == BTRFS_SHARED_DATA_REF_KEY) {
520 logical = btrfs_extent_inline_ref_offset(eb, eiref);
521 ret = __shared_list_add(&shared_refs, logical);
522 }
523 } while (!ret && !last);
524 1176
525 /* ... then we proceed to in-tree references and ... */ 1177 while (!ret && (ref_node = ulist_next(refs, ref_node))) {
526 while (!ret) { 1178 ret = btrfs_find_all_roots(trans, fs_info, ref_node->val, -1,
527 ++path->slots[0]; 1179 seq_elem.seq, &roots);
528 if (path->slots[0] > btrfs_header_nritems(eb)) { 1180 if (ret)
529 ret = btrfs_next_leaf(fs_info->extent_root, path);
530 if (ret) {
531 if (ret == 1)
532 ret = 0; /* we're done */
533 break;
534 }
535 eb = path->nodes[0];
536 }
537 btrfs_item_key_to_cpu(eb, &key, path->slots[0]);
538 if (key.objectid != extent_item_objectid)
539 break; 1181 break;
540 if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { 1182 while (!ret && (root_node = ulist_next(roots, root_node))) {
541 dref = btrfs_item_ptr(eb, path->slots[0], 1183 pr_debug("root %llu references leaf %llu\n",
542 struct btrfs_extent_data_ref); 1184 root_node->val, ref_node->val);
543 ret = __data_list_add_eb(&data_refs, eb, dref); 1185 ret = iterate_leaf_refs(fs_info, path, ref_node->val,
544 } else if (key.type == BTRFS_SHARED_DATA_REF_KEY) { 1186 extent_item_objectid,
545 ret = __shared_list_add(&shared_refs, key.offset); 1187 extent_item_pos, root_node->val,
1188 iterate, ctx);
546 } 1189 }
547 } 1190 }
548 1191
549 btrfs_release_path(path); 1192 ulist_free(refs);
550 1193 ulist_free(roots);
551 /* 1194out:
552 * ... only at the very end we can process the refs we found. this is 1195 btrfs_put_delayed_seq(delayed_refs, &seq_elem);
553 * because the iterator function we call is allowed to make tree lookups 1196 btrfs_end_transaction(trans, fs_info->extent_root);
554 * and we have to avoid deadlocks. additionally, we need more tree
555 * lookups ourselves for shared data refs.
556 */
557 while (!list_empty(&data_refs)) {
558 ref_d = list_first_entry(&data_refs, struct __data_ref, list);
559 list_del(&ref_d->list);
560 if (!ret)
561 ret = iterate(ref_d->inum, extent_offset +
562 ref_d->extent_data_item_offset,
563 ref_d->root, ctx);
564 kfree(ref_d);
565 }
566
567 while (!list_empty(&shared_refs)) {
568 ref_s = list_first_entry(&shared_refs, struct __shared_ref,
569 list);
570 list_del(&ref_s->list);
571 if (!ret)
572 ret = __iter_shared_inline_ref(fs_info,
573 ref_s->disk_byte,
574 extent_item_objectid,
575 extent_offset, path,
576 &data_refs,
577 iterate, ctx);
578 kfree(ref_s);
579 }
580
581 return ret; 1197 return ret;
582} 1198}
583 1199
@@ -586,19 +1202,20 @@ int iterate_inodes_from_logical(u64 logical, struct btrfs_fs_info *fs_info,
586 iterate_extent_inodes_t *iterate, void *ctx) 1202 iterate_extent_inodes_t *iterate, void *ctx)
587{ 1203{
588 int ret; 1204 int ret;
589 u64 offset; 1205 u64 extent_item_pos;
590 struct btrfs_key found_key; 1206 struct btrfs_key found_key;
591 1207
592 ret = extent_from_logical(fs_info, logical, path, 1208 ret = extent_from_logical(fs_info, logical, path,
593 &found_key); 1209 &found_key);
1210 btrfs_release_path(path);
594 if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) 1211 if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK)
595 ret = -EINVAL; 1212 ret = -EINVAL;
596 if (ret < 0) 1213 if (ret < 0)
597 return ret; 1214 return ret;
598 1215
599 offset = logical - found_key.objectid; 1216 extent_item_pos = logical - found_key.objectid;
600 ret = iterate_extent_inodes(fs_info, path, found_key.objectid, 1217 ret = iterate_extent_inodes(fs_info, path, found_key.objectid,
601 offset, iterate, ctx); 1218 extent_item_pos, iterate, ctx);
602 1219
603 return ret; 1220 return ret;
604} 1221}
@@ -643,6 +1260,10 @@ static int iterate_irefs(u64 inum, struct btrfs_root *fs_root,
643 for (cur = 0; cur < btrfs_item_size(eb, item); cur += len) { 1260 for (cur = 0; cur < btrfs_item_size(eb, item); cur += len) {
644 name_len = btrfs_inode_ref_name_len(eb, iref); 1261 name_len = btrfs_inode_ref_name_len(eb, iref);
645 /* path must be released before calling iterate()! */ 1262 /* path must be released before calling iterate()! */
1263 pr_debug("following ref at offset %u for inode %llu in "
1264 "tree %llu\n", cur,
1265 (unsigned long long)found_key.objectid,
1266 (unsigned long long)fs_root->objectid);
646 ret = iterate(parent, iref, eb, ctx); 1267 ret = iterate(parent, iref, eb, ctx);
647 if (ret) { 1268 if (ret) {
648 free_extent_buffer(eb); 1269 free_extent_buffer(eb);
@@ -683,10 +1304,14 @@ static int inode_to_path(u64 inum, struct btrfs_inode_ref *iref,
683 return PTR_ERR(fspath); 1304 return PTR_ERR(fspath);
684 1305
685 if (fspath > fspath_min) { 1306 if (fspath > fspath_min) {
1307 pr_debug("path resolved: %s\n", fspath);
686 ipath->fspath->val[i] = (u64)(unsigned long)fspath; 1308 ipath->fspath->val[i] = (u64)(unsigned long)fspath;
687 ++ipath->fspath->elem_cnt; 1309 ++ipath->fspath->elem_cnt;
688 ipath->fspath->bytes_left = fspath - fspath_min; 1310 ipath->fspath->bytes_left = fspath - fspath_min;
689 } else { 1311 } else {
1312 pr_debug("missed path, not enough space. missing bytes: %lu, "
1313 "constructed so far: %s\n",
1314 (unsigned long)(fspath_min - fspath), fspath_min);
690 ++ipath->fspath->elem_missed; 1315 ++ipath->fspath->elem_missed;
691 ipath->fspath->bytes_missing += fspath_min - fspath; 1316 ipath->fspath->bytes_missing += fspath_min - fspath;
692 ipath->fspath->bytes_left = 0; 1317 ipath->fspath->bytes_left = 0;
diff --git a/fs/btrfs/backref.h b/fs/btrfs/backref.h
index 92618837cb8f..d00dfa9ca934 100644
--- a/fs/btrfs/backref.h
+++ b/fs/btrfs/backref.h
@@ -20,6 +20,7 @@
20#define __BTRFS_BACKREF__ 20#define __BTRFS_BACKREF__
21 21
22#include "ioctl.h" 22#include "ioctl.h"
23#include "ulist.h"
23 24
24struct inode_fs_paths { 25struct inode_fs_paths {
25 struct btrfs_path *btrfs_path; 26 struct btrfs_path *btrfs_path;
@@ -54,6 +55,10 @@ int iterate_inodes_from_logical(u64 logical, struct btrfs_fs_info *fs_info,
54 55
55int paths_from_inode(u64 inum, struct inode_fs_paths *ipath); 56int paths_from_inode(u64 inum, struct inode_fs_paths *ipath);
56 57
58int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
59 struct btrfs_fs_info *fs_info, u64 bytenr,
60 u64 num_bytes, u64 seq, struct ulist **roots);
61
57struct btrfs_data_container *init_data_container(u32 total_bytes); 62struct btrfs_data_container *init_data_container(u32 total_bytes);
58struct inode_fs_paths *init_ipath(s32 total_bytes, struct btrfs_root *fs_root, 63struct inode_fs_paths *init_ipath(s32 total_bytes, struct btrfs_root *fs_root,
59 struct btrfs_path *path); 64 struct btrfs_path *path);
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index dede441bdeee..0639a555e16e 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -240,7 +240,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
240 240
241 cow = btrfs_alloc_free_block(trans, root, buf->len, 0, 241 cow = btrfs_alloc_free_block(trans, root, buf->len, 0,
242 new_root_objectid, &disk_key, level, 242 new_root_objectid, &disk_key, level,
243 buf->start, 0); 243 buf->start, 0, 1);
244 if (IS_ERR(cow)) 244 if (IS_ERR(cow))
245 return PTR_ERR(cow); 245 return PTR_ERR(cow);
246 246
@@ -261,9 +261,9 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
261 261
262 WARN_ON(btrfs_header_generation(buf) > trans->transid); 262 WARN_ON(btrfs_header_generation(buf) > trans->transid);
263 if (new_root_objectid == BTRFS_TREE_RELOC_OBJECTID) 263 if (new_root_objectid == BTRFS_TREE_RELOC_OBJECTID)
264 ret = btrfs_inc_ref(trans, root, cow, 1); 264 ret = btrfs_inc_ref(trans, root, cow, 1, 1);
265 else 265 else
266 ret = btrfs_inc_ref(trans, root, cow, 0); 266 ret = btrfs_inc_ref(trans, root, cow, 0, 1);
267 267
268 if (ret) 268 if (ret)
269 return ret; 269 return ret;
@@ -350,14 +350,14 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
350 if ((owner == root->root_key.objectid || 350 if ((owner == root->root_key.objectid ||
351 root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) && 351 root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) &&
352 !(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) { 352 !(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) {
353 ret = btrfs_inc_ref(trans, root, buf, 1); 353 ret = btrfs_inc_ref(trans, root, buf, 1, 1);
354 BUG_ON(ret); 354 BUG_ON(ret);
355 355
356 if (root->root_key.objectid == 356 if (root->root_key.objectid ==
357 BTRFS_TREE_RELOC_OBJECTID) { 357 BTRFS_TREE_RELOC_OBJECTID) {
358 ret = btrfs_dec_ref(trans, root, buf, 0); 358 ret = btrfs_dec_ref(trans, root, buf, 0, 1);
359 BUG_ON(ret); 359 BUG_ON(ret);
360 ret = btrfs_inc_ref(trans, root, cow, 1); 360 ret = btrfs_inc_ref(trans, root, cow, 1, 1);
361 BUG_ON(ret); 361 BUG_ON(ret);
362 } 362 }
363 new_flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; 363 new_flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
@@ -365,9 +365,9 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
365 365
366 if (root->root_key.objectid == 366 if (root->root_key.objectid ==
367 BTRFS_TREE_RELOC_OBJECTID) 367 BTRFS_TREE_RELOC_OBJECTID)
368 ret = btrfs_inc_ref(trans, root, cow, 1); 368 ret = btrfs_inc_ref(trans, root, cow, 1, 1);
369 else 369 else
370 ret = btrfs_inc_ref(trans, root, cow, 0); 370 ret = btrfs_inc_ref(trans, root, cow, 0, 1);
371 BUG_ON(ret); 371 BUG_ON(ret);
372 } 372 }
373 if (new_flags != 0) { 373 if (new_flags != 0) {
@@ -381,11 +381,11 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
381 if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) { 381 if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
382 if (root->root_key.objectid == 382 if (root->root_key.objectid ==
383 BTRFS_TREE_RELOC_OBJECTID) 383 BTRFS_TREE_RELOC_OBJECTID)
384 ret = btrfs_inc_ref(trans, root, cow, 1); 384 ret = btrfs_inc_ref(trans, root, cow, 1, 1);
385 else 385 else
386 ret = btrfs_inc_ref(trans, root, cow, 0); 386 ret = btrfs_inc_ref(trans, root, cow, 0, 1);
387 BUG_ON(ret); 387 BUG_ON(ret);
388 ret = btrfs_dec_ref(trans, root, buf, 1); 388 ret = btrfs_dec_ref(trans, root, buf, 1, 1);
389 BUG_ON(ret); 389 BUG_ON(ret);
390 } 390 }
391 clean_tree_block(trans, root, buf); 391 clean_tree_block(trans, root, buf);
@@ -446,7 +446,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
446 446
447 cow = btrfs_alloc_free_block(trans, root, buf->len, parent_start, 447 cow = btrfs_alloc_free_block(trans, root, buf->len, parent_start,
448 root->root_key.objectid, &disk_key, 448 root->root_key.objectid, &disk_key,
449 level, search_start, empty_size); 449 level, search_start, empty_size, 1);
450 if (IS_ERR(cow)) 450 if (IS_ERR(cow))
451 return PTR_ERR(cow); 451 return PTR_ERR(cow);
452 452
@@ -484,7 +484,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
484 rcu_assign_pointer(root->node, cow); 484 rcu_assign_pointer(root->node, cow);
485 485
486 btrfs_free_tree_block(trans, root, buf, parent_start, 486 btrfs_free_tree_block(trans, root, buf, parent_start,
487 last_ref); 487 last_ref, 1);
488 free_extent_buffer(buf); 488 free_extent_buffer(buf);
489 add_root_to_dirty_list(root); 489 add_root_to_dirty_list(root);
490 } else { 490 } else {
@@ -500,7 +500,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
500 trans->transid); 500 trans->transid);
501 btrfs_mark_buffer_dirty(parent); 501 btrfs_mark_buffer_dirty(parent);
502 btrfs_free_tree_block(trans, root, buf, parent_start, 502 btrfs_free_tree_block(trans, root, buf, parent_start,
503 last_ref); 503 last_ref, 1);
504 } 504 }
505 if (unlock_orig) 505 if (unlock_orig)
506 btrfs_tree_unlock(buf); 506 btrfs_tree_unlock(buf);
@@ -957,7 +957,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
957 free_extent_buffer(mid); 957 free_extent_buffer(mid);
958 958
959 root_sub_used(root, mid->len); 959 root_sub_used(root, mid->len);
960 btrfs_free_tree_block(trans, root, mid, 0, 1); 960 btrfs_free_tree_block(trans, root, mid, 0, 1, 0);
961 /* once for the root ptr */ 961 /* once for the root ptr */
962 free_extent_buffer(mid); 962 free_extent_buffer(mid);
963 return 0; 963 return 0;
@@ -1015,7 +1015,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
1015 if (wret) 1015 if (wret)
1016 ret = wret; 1016 ret = wret;
1017 root_sub_used(root, right->len); 1017 root_sub_used(root, right->len);
1018 btrfs_free_tree_block(trans, root, right, 0, 1); 1018 btrfs_free_tree_block(trans, root, right, 0, 1, 0);
1019 free_extent_buffer(right); 1019 free_extent_buffer(right);
1020 right = NULL; 1020 right = NULL;
1021 } else { 1021 } else {
@@ -1055,7 +1055,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
1055 if (wret) 1055 if (wret)
1056 ret = wret; 1056 ret = wret;
1057 root_sub_used(root, mid->len); 1057 root_sub_used(root, mid->len);
1058 btrfs_free_tree_block(trans, root, mid, 0, 1); 1058 btrfs_free_tree_block(trans, root, mid, 0, 1, 0);
1059 free_extent_buffer(mid); 1059 free_extent_buffer(mid);
1060 mid = NULL; 1060 mid = NULL;
1061 } else { 1061 } else {
@@ -2089,7 +2089,7 @@ static noinline int insert_new_root(struct btrfs_trans_handle *trans,
2089 2089
2090 c = btrfs_alloc_free_block(trans, root, root->nodesize, 0, 2090 c = btrfs_alloc_free_block(trans, root, root->nodesize, 0,
2091 root->root_key.objectid, &lower_key, 2091 root->root_key.objectid, &lower_key,
2092 level, root->node->start, 0); 2092 level, root->node->start, 0, 0);
2093 if (IS_ERR(c)) 2093 if (IS_ERR(c))
2094 return PTR_ERR(c); 2094 return PTR_ERR(c);
2095 2095
@@ -2216,7 +2216,7 @@ static noinline int split_node(struct btrfs_trans_handle *trans,
2216 2216
2217 split = btrfs_alloc_free_block(trans, root, root->nodesize, 0, 2217 split = btrfs_alloc_free_block(trans, root, root->nodesize, 0,
2218 root->root_key.objectid, 2218 root->root_key.objectid,
2219 &disk_key, level, c->start, 0); 2219 &disk_key, level, c->start, 0, 0);
2220 if (IS_ERR(split)) 2220 if (IS_ERR(split))
2221 return PTR_ERR(split); 2221 return PTR_ERR(split);
2222 2222
@@ -2970,7 +2970,7 @@ again:
2970 2970
2971 right = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 2971 right = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
2972 root->root_key.objectid, 2972 root->root_key.objectid,
2973 &disk_key, 0, l->start, 0); 2973 &disk_key, 0, l->start, 0, 0);
2974 if (IS_ERR(right)) 2974 if (IS_ERR(right))
2975 return PTR_ERR(right); 2975 return PTR_ERR(right);
2976 2976
@@ -3781,7 +3781,7 @@ static noinline int btrfs_del_leaf(struct btrfs_trans_handle *trans,
3781 3781
3782 root_sub_used(root, leaf->len); 3782 root_sub_used(root, leaf->len);
3783 3783
3784 btrfs_free_tree_block(trans, root, leaf, 0, 1); 3784 btrfs_free_tree_block(trans, root, leaf, 0, 1, 0);
3785 return 0; 3785 return 0;
3786} 3786}
3787/* 3787/*
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index dfc136cc07d7..b6d1020c4571 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2439,11 +2439,11 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2439 struct btrfs_root *root, u32 blocksize, 2439 struct btrfs_root *root, u32 blocksize,
2440 u64 parent, u64 root_objectid, 2440 u64 parent, u64 root_objectid,
2441 struct btrfs_disk_key *key, int level, 2441 struct btrfs_disk_key *key, int level,
2442 u64 hint, u64 empty_size); 2442 u64 hint, u64 empty_size, int for_cow);
2443void btrfs_free_tree_block(struct btrfs_trans_handle *trans, 2443void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2444 struct btrfs_root *root, 2444 struct btrfs_root *root,
2445 struct extent_buffer *buf, 2445 struct extent_buffer *buf,
2446 u64 parent, int last_ref); 2446 u64 parent, int last_ref, int for_cow);
2447struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, 2447struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
2448 struct btrfs_root *root, 2448 struct btrfs_root *root,
2449 u64 bytenr, u32 blocksize, 2449 u64 bytenr, u32 blocksize,
@@ -2463,17 +2463,17 @@ int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2463 u64 search_end, struct btrfs_key *ins, 2463 u64 search_end, struct btrfs_key *ins,
2464 u64 data); 2464 u64 data);
2465int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2465int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2466 struct extent_buffer *buf, int full_backref); 2466 struct extent_buffer *buf, int full_backref, int for_cow);
2467int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2467int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2468 struct extent_buffer *buf, int full_backref); 2468 struct extent_buffer *buf, int full_backref, int for_cow);
2469int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, 2469int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2470 struct btrfs_root *root, 2470 struct btrfs_root *root,
2471 u64 bytenr, u64 num_bytes, u64 flags, 2471 u64 bytenr, u64 num_bytes, u64 flags,
2472 int is_data); 2472 int is_data);
2473int btrfs_free_extent(struct btrfs_trans_handle *trans, 2473int btrfs_free_extent(struct btrfs_trans_handle *trans,
2474 struct btrfs_root *root, 2474 struct btrfs_root *root,
2475 u64 bytenr, u64 num_bytes, u64 parent, 2475 u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2476 u64 root_objectid, u64 owner, u64 offset); 2476 u64 owner, u64 offset, int for_cow);
2477 2477
2478int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len); 2478int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
2479int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, 2479int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
@@ -2485,7 +2485,7 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2485int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 2485int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2486 struct btrfs_root *root, 2486 struct btrfs_root *root,
2487 u64 bytenr, u64 num_bytes, u64 parent, 2487 u64 bytenr, u64 num_bytes, u64 parent,
2488 u64 root_objectid, u64 owner, u64 offset); 2488 u64 root_objectid, u64 owner, u64 offset, int for_cow);
2489 2489
2490int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, 2490int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2491 struct btrfs_root *root); 2491 struct btrfs_root *root);
@@ -2644,10 +2644,18 @@ static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2644} 2644}
2645 2645
2646int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); 2646int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2647static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2648{
2649 ++p->slots[0];
2650 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2651 return btrfs_next_leaf(root, p);
2652 return 0;
2653}
2647int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); 2654int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2648int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf); 2655int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2649void btrfs_drop_snapshot(struct btrfs_root *root, 2656void btrfs_drop_snapshot(struct btrfs_root *root,
2650 struct btrfs_block_rsv *block_rsv, int update_ref); 2657 struct btrfs_block_rsv *block_rsv, int update_ref,
2658 int for_reloc);
2651int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 2659int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2652 struct btrfs_root *root, 2660 struct btrfs_root *root,
2653 struct extent_buffer *node, 2661 struct extent_buffer *node,
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 125cf76fcd08..66e4f29505a3 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -101,6 +101,11 @@ static int comp_entry(struct btrfs_delayed_ref_node *ref2,
101 return -1; 101 return -1;
102 if (ref1->type > ref2->type) 102 if (ref1->type > ref2->type)
103 return 1; 103 return 1;
104 /* merging of sequenced refs is not allowed */
105 if (ref1->seq < ref2->seq)
106 return -1;
107 if (ref1->seq > ref2->seq)
108 return 1;
104 if (ref1->type == BTRFS_TREE_BLOCK_REF_KEY || 109 if (ref1->type == BTRFS_TREE_BLOCK_REF_KEY ||
105 ref1->type == BTRFS_SHARED_BLOCK_REF_KEY) { 110 ref1->type == BTRFS_SHARED_BLOCK_REF_KEY) {
106 return comp_tree_refs(btrfs_delayed_node_to_tree_ref(ref2), 111 return comp_tree_refs(btrfs_delayed_node_to_tree_ref(ref2),
@@ -150,16 +155,22 @@ static struct btrfs_delayed_ref_node *tree_insert(struct rb_root *root,
150 155
151/* 156/*
152 * find an head entry based on bytenr. This returns the delayed ref 157 * find an head entry based on bytenr. This returns the delayed ref
153 * head if it was able to find one, or NULL if nothing was in that spot 158 * head if it was able to find one, or NULL if nothing was in that spot.
159 * If return_bigger is given, the next bigger entry is returned if no exact
160 * match is found.
154 */ 161 */
155static struct btrfs_delayed_ref_node *find_ref_head(struct rb_root *root, 162static struct btrfs_delayed_ref_node *find_ref_head(struct rb_root *root,
156 u64 bytenr, 163 u64 bytenr,
157 struct btrfs_delayed_ref_node **last) 164 struct btrfs_delayed_ref_node **last,
165 int return_bigger)
158{ 166{
159 struct rb_node *n = root->rb_node; 167 struct rb_node *n;
160 struct btrfs_delayed_ref_node *entry; 168 struct btrfs_delayed_ref_node *entry;
161 int cmp; 169 int cmp = 0;
162 170
171again:
172 n = root->rb_node;
173 entry = NULL;
163 while (n) { 174 while (n) {
164 entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node); 175 entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node);
165 WARN_ON(!entry->in_tree); 176 WARN_ON(!entry->in_tree);
@@ -182,6 +193,19 @@ static struct btrfs_delayed_ref_node *find_ref_head(struct rb_root *root,
182 else 193 else
183 return entry; 194 return entry;
184 } 195 }
196 if (entry && return_bigger) {
197 if (cmp > 0) {
198 n = rb_next(&entry->rb_node);
199 if (!n)
200 n = rb_first(root);
201 entry = rb_entry(n, struct btrfs_delayed_ref_node,
202 rb_node);
203 bytenr = entry->bytenr;
204 return_bigger = 0;
205 goto again;
206 }
207 return entry;
208 }
185 return NULL; 209 return NULL;
186} 210}
187 211
@@ -209,6 +233,24 @@ int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
209 return 0; 233 return 0;
210} 234}
211 235
236int btrfs_check_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs,
237 u64 seq)
238{
239 struct seq_list *elem;
240
241 assert_spin_locked(&delayed_refs->lock);
242 if (list_empty(&delayed_refs->seq_head))
243 return 0;
244
245 elem = list_first_entry(&delayed_refs->seq_head, struct seq_list, list);
246 if (seq >= elem->seq) {
247 pr_debug("holding back delayed_ref %llu, lowest is %llu (%p)\n",
248 seq, elem->seq, delayed_refs);
249 return 1;
250 }
251 return 0;
252}
253
212int btrfs_find_ref_cluster(struct btrfs_trans_handle *trans, 254int btrfs_find_ref_cluster(struct btrfs_trans_handle *trans,
213 struct list_head *cluster, u64 start) 255 struct list_head *cluster, u64 start)
214{ 256{
@@ -223,20 +265,8 @@ int btrfs_find_ref_cluster(struct btrfs_trans_handle *trans,
223 node = rb_first(&delayed_refs->root); 265 node = rb_first(&delayed_refs->root);
224 } else { 266 } else {
225 ref = NULL; 267 ref = NULL;
226 find_ref_head(&delayed_refs->root, start, &ref); 268 find_ref_head(&delayed_refs->root, start + 1, &ref, 1);
227 if (ref) { 269 if (ref) {
228 struct btrfs_delayed_ref_node *tmp;
229
230 node = rb_prev(&ref->rb_node);
231 while (node) {
232 tmp = rb_entry(node,
233 struct btrfs_delayed_ref_node,
234 rb_node);
235 if (tmp->bytenr < start)
236 break;
237 ref = tmp;
238 node = rb_prev(&ref->rb_node);
239 }
240 node = &ref->rb_node; 270 node = &ref->rb_node;
241 } else 271 } else
242 node = rb_first(&delayed_refs->root); 272 node = rb_first(&delayed_refs->root);
@@ -390,7 +420,8 @@ update_existing_head_ref(struct btrfs_delayed_ref_node *existing,
390 * this does all the dirty work in terms of maintaining the correct 420 * this does all the dirty work in terms of maintaining the correct
391 * overall modification count. 421 * overall modification count.
392 */ 422 */
393static noinline int add_delayed_ref_head(struct btrfs_trans_handle *trans, 423static noinline int add_delayed_ref_head(struct btrfs_fs_info *fs_info,
424 struct btrfs_trans_handle *trans,
394 struct btrfs_delayed_ref_node *ref, 425 struct btrfs_delayed_ref_node *ref,
395 u64 bytenr, u64 num_bytes, 426 u64 bytenr, u64 num_bytes,
396 int action, int is_data) 427 int action, int is_data)
@@ -437,6 +468,7 @@ static noinline int add_delayed_ref_head(struct btrfs_trans_handle *trans,
437 ref->action = 0; 468 ref->action = 0;
438 ref->is_head = 1; 469 ref->is_head = 1;
439 ref->in_tree = 1; 470 ref->in_tree = 1;
471 ref->seq = 0;
440 472
441 head_ref = btrfs_delayed_node_to_head(ref); 473 head_ref = btrfs_delayed_node_to_head(ref);
442 head_ref->must_insert_reserved = must_insert_reserved; 474 head_ref->must_insert_reserved = must_insert_reserved;
@@ -468,14 +500,17 @@ static noinline int add_delayed_ref_head(struct btrfs_trans_handle *trans,
468/* 500/*
469 * helper to insert a delayed tree ref into the rbtree. 501 * helper to insert a delayed tree ref into the rbtree.
470 */ 502 */
471static noinline int add_delayed_tree_ref(struct btrfs_trans_handle *trans, 503static noinline int add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
504 struct btrfs_trans_handle *trans,
472 struct btrfs_delayed_ref_node *ref, 505 struct btrfs_delayed_ref_node *ref,
473 u64 bytenr, u64 num_bytes, u64 parent, 506 u64 bytenr, u64 num_bytes, u64 parent,
474 u64 ref_root, int level, int action) 507 u64 ref_root, int level, int action,
508 int for_cow)
475{ 509{
476 struct btrfs_delayed_ref_node *existing; 510 struct btrfs_delayed_ref_node *existing;
477 struct btrfs_delayed_tree_ref *full_ref; 511 struct btrfs_delayed_tree_ref *full_ref;
478 struct btrfs_delayed_ref_root *delayed_refs; 512 struct btrfs_delayed_ref_root *delayed_refs;
513 u64 seq = 0;
479 514
480 if (action == BTRFS_ADD_DELAYED_EXTENT) 515 if (action == BTRFS_ADD_DELAYED_EXTENT)
481 action = BTRFS_ADD_DELAYED_REF; 516 action = BTRFS_ADD_DELAYED_REF;
@@ -491,14 +526,17 @@ static noinline int add_delayed_tree_ref(struct btrfs_trans_handle *trans,
491 ref->is_head = 0; 526 ref->is_head = 0;
492 ref->in_tree = 1; 527 ref->in_tree = 1;
493 528
529 if (need_ref_seq(for_cow, ref_root))
530 seq = inc_delayed_seq(delayed_refs);
531 ref->seq = seq;
532
494 full_ref = btrfs_delayed_node_to_tree_ref(ref); 533 full_ref = btrfs_delayed_node_to_tree_ref(ref);
495 if (parent) { 534 full_ref->parent = parent;
496 full_ref->parent = parent; 535 full_ref->root = ref_root;
536 if (parent)
497 ref->type = BTRFS_SHARED_BLOCK_REF_KEY; 537 ref->type = BTRFS_SHARED_BLOCK_REF_KEY;
498 } else { 538 else
499 full_ref->root = ref_root;
500 ref->type = BTRFS_TREE_BLOCK_REF_KEY; 539 ref->type = BTRFS_TREE_BLOCK_REF_KEY;
501 }
502 full_ref->level = level; 540 full_ref->level = level;
503 541
504 trace_btrfs_delayed_tree_ref(ref, full_ref, action); 542 trace_btrfs_delayed_tree_ref(ref, full_ref, action);
@@ -522,15 +560,17 @@ static noinline int add_delayed_tree_ref(struct btrfs_trans_handle *trans,
522/* 560/*
523 * helper to insert a delayed data ref into the rbtree. 561 * helper to insert a delayed data ref into the rbtree.
524 */ 562 */
525static noinline int add_delayed_data_ref(struct btrfs_trans_handle *trans, 563static noinline int add_delayed_data_ref(struct btrfs_fs_info *fs_info,
564 struct btrfs_trans_handle *trans,
526 struct btrfs_delayed_ref_node *ref, 565 struct btrfs_delayed_ref_node *ref,
527 u64 bytenr, u64 num_bytes, u64 parent, 566 u64 bytenr, u64 num_bytes, u64 parent,
528 u64 ref_root, u64 owner, u64 offset, 567 u64 ref_root, u64 owner, u64 offset,
529 int action) 568 int action, int for_cow)
530{ 569{
531 struct btrfs_delayed_ref_node *existing; 570 struct btrfs_delayed_ref_node *existing;
532 struct btrfs_delayed_data_ref *full_ref; 571 struct btrfs_delayed_data_ref *full_ref;
533 struct btrfs_delayed_ref_root *delayed_refs; 572 struct btrfs_delayed_ref_root *delayed_refs;
573 u64 seq = 0;
534 574
535 if (action == BTRFS_ADD_DELAYED_EXTENT) 575 if (action == BTRFS_ADD_DELAYED_EXTENT)
536 action = BTRFS_ADD_DELAYED_REF; 576 action = BTRFS_ADD_DELAYED_REF;
@@ -546,14 +586,18 @@ static noinline int add_delayed_data_ref(struct btrfs_trans_handle *trans,
546 ref->is_head = 0; 586 ref->is_head = 0;
547 ref->in_tree = 1; 587 ref->in_tree = 1;
548 588
589 if (need_ref_seq(for_cow, ref_root))
590 seq = inc_delayed_seq(delayed_refs);
591 ref->seq = seq;
592
549 full_ref = btrfs_delayed_node_to_data_ref(ref); 593 full_ref = btrfs_delayed_node_to_data_ref(ref);
550 if (parent) { 594 full_ref->parent = parent;
551 full_ref->parent = parent; 595 full_ref->root = ref_root;
596 if (parent)
552 ref->type = BTRFS_SHARED_DATA_REF_KEY; 597 ref->type = BTRFS_SHARED_DATA_REF_KEY;
553 } else { 598 else
554 full_ref->root = ref_root;
555 ref->type = BTRFS_EXTENT_DATA_REF_KEY; 599 ref->type = BTRFS_EXTENT_DATA_REF_KEY;
556 } 600
557 full_ref->objectid = owner; 601 full_ref->objectid = owner;
558 full_ref->offset = offset; 602 full_ref->offset = offset;
559 603
@@ -580,10 +624,12 @@ static noinline int add_delayed_data_ref(struct btrfs_trans_handle *trans,
580 * to make sure the delayed ref is eventually processed before this 624 * to make sure the delayed ref is eventually processed before this
581 * transaction commits. 625 * transaction commits.
582 */ 626 */
583int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans, 627int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
628 struct btrfs_trans_handle *trans,
584 u64 bytenr, u64 num_bytes, u64 parent, 629 u64 bytenr, u64 num_bytes, u64 parent,
585 u64 ref_root, int level, int action, 630 u64 ref_root, int level, int action,
586 struct btrfs_delayed_extent_op *extent_op) 631 struct btrfs_delayed_extent_op *extent_op,
632 int for_cow)
587{ 633{
588 struct btrfs_delayed_tree_ref *ref; 634 struct btrfs_delayed_tree_ref *ref;
589 struct btrfs_delayed_ref_head *head_ref; 635 struct btrfs_delayed_ref_head *head_ref;
@@ -610,13 +656,17 @@ int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans,
610 * insert both the head node and the new ref without dropping 656 * insert both the head node and the new ref without dropping
611 * the spin lock 657 * the spin lock
612 */ 658 */
613 ret = add_delayed_ref_head(trans, &head_ref->node, bytenr, num_bytes, 659 ret = add_delayed_ref_head(fs_info, trans, &head_ref->node, bytenr,
614 action, 0); 660 num_bytes, action, 0);
615 BUG_ON(ret); 661 BUG_ON(ret);
616 662
617 ret = add_delayed_tree_ref(trans, &ref->node, bytenr, num_bytes, 663 ret = add_delayed_tree_ref(fs_info, trans, &ref->node, bytenr,
618 parent, ref_root, level, action); 664 num_bytes, parent, ref_root, level, action,
665 for_cow);
619 BUG_ON(ret); 666 BUG_ON(ret);
667 if (!need_ref_seq(for_cow, ref_root) &&
668 waitqueue_active(&delayed_refs->seq_wait))
669 wake_up(&delayed_refs->seq_wait);
620 spin_unlock(&delayed_refs->lock); 670 spin_unlock(&delayed_refs->lock);
621 return 0; 671 return 0;
622} 672}
@@ -624,11 +674,13 @@ int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans,
624/* 674/*
625 * add a delayed data ref. it's similar to btrfs_add_delayed_tree_ref. 675 * add a delayed data ref. it's similar to btrfs_add_delayed_tree_ref.
626 */ 676 */
627int btrfs_add_delayed_data_ref(struct btrfs_trans_handle *trans, 677int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
678 struct btrfs_trans_handle *trans,
628 u64 bytenr, u64 num_bytes, 679 u64 bytenr, u64 num_bytes,
629 u64 parent, u64 ref_root, 680 u64 parent, u64 ref_root,
630 u64 owner, u64 offset, int action, 681 u64 owner, u64 offset, int action,
631 struct btrfs_delayed_extent_op *extent_op) 682 struct btrfs_delayed_extent_op *extent_op,
683 int for_cow)
632{ 684{
633 struct btrfs_delayed_data_ref *ref; 685 struct btrfs_delayed_data_ref *ref;
634 struct btrfs_delayed_ref_head *head_ref; 686 struct btrfs_delayed_ref_head *head_ref;
@@ -655,18 +707,23 @@ int btrfs_add_delayed_data_ref(struct btrfs_trans_handle *trans,
655 * insert both the head node and the new ref without dropping 707 * insert both the head node and the new ref without dropping
656 * the spin lock 708 * the spin lock
657 */ 709 */
658 ret = add_delayed_ref_head(trans, &head_ref->node, bytenr, num_bytes, 710 ret = add_delayed_ref_head(fs_info, trans, &head_ref->node, bytenr,
659 action, 1); 711 num_bytes, action, 1);
660 BUG_ON(ret); 712 BUG_ON(ret);
661 713
662 ret = add_delayed_data_ref(trans, &ref->node, bytenr, num_bytes, 714 ret = add_delayed_data_ref(fs_info, trans, &ref->node, bytenr,
663 parent, ref_root, owner, offset, action); 715 num_bytes, parent, ref_root, owner, offset,
716 action, for_cow);
664 BUG_ON(ret); 717 BUG_ON(ret);
718 if (!need_ref_seq(for_cow, ref_root) &&
719 waitqueue_active(&delayed_refs->seq_wait))
720 wake_up(&delayed_refs->seq_wait);
665 spin_unlock(&delayed_refs->lock); 721 spin_unlock(&delayed_refs->lock);
666 return 0; 722 return 0;
667} 723}
668 724
669int btrfs_add_delayed_extent_op(struct btrfs_trans_handle *trans, 725int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
726 struct btrfs_trans_handle *trans,
670 u64 bytenr, u64 num_bytes, 727 u64 bytenr, u64 num_bytes,
671 struct btrfs_delayed_extent_op *extent_op) 728 struct btrfs_delayed_extent_op *extent_op)
672{ 729{
@@ -683,11 +740,13 @@ int btrfs_add_delayed_extent_op(struct btrfs_trans_handle *trans,
683 delayed_refs = &trans->transaction->delayed_refs; 740 delayed_refs = &trans->transaction->delayed_refs;
684 spin_lock(&delayed_refs->lock); 741 spin_lock(&delayed_refs->lock);
685 742
686 ret = add_delayed_ref_head(trans, &head_ref->node, bytenr, 743 ret = add_delayed_ref_head(fs_info, trans, &head_ref->node, bytenr,
687 num_bytes, BTRFS_UPDATE_DELAYED_HEAD, 744 num_bytes, BTRFS_UPDATE_DELAYED_HEAD,
688 extent_op->is_data); 745 extent_op->is_data);
689 BUG_ON(ret); 746 BUG_ON(ret);
690 747
748 if (waitqueue_active(&delayed_refs->seq_wait))
749 wake_up(&delayed_refs->seq_wait);
691 spin_unlock(&delayed_refs->lock); 750 spin_unlock(&delayed_refs->lock);
692 return 0; 751 return 0;
693} 752}
@@ -704,7 +763,7 @@ btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr)
704 struct btrfs_delayed_ref_root *delayed_refs; 763 struct btrfs_delayed_ref_root *delayed_refs;
705 764
706 delayed_refs = &trans->transaction->delayed_refs; 765 delayed_refs = &trans->transaction->delayed_refs;
707 ref = find_ref_head(&delayed_refs->root, bytenr, NULL); 766 ref = find_ref_head(&delayed_refs->root, bytenr, NULL, 0);
708 if (ref) 767 if (ref)
709 return btrfs_delayed_node_to_head(ref); 768 return btrfs_delayed_node_to_head(ref);
710 return NULL; 769 return NULL;
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index e287e3b0eab0..d8f244d94925 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -33,6 +33,9 @@ struct btrfs_delayed_ref_node {
33 /* the size of the extent */ 33 /* the size of the extent */
34 u64 num_bytes; 34 u64 num_bytes;
35 35
36 /* seq number to keep track of insertion order */
37 u64 seq;
38
36 /* ref count on this data structure */ 39 /* ref count on this data structure */
37 atomic_t refs; 40 atomic_t refs;
38 41
@@ -98,19 +101,15 @@ struct btrfs_delayed_ref_head {
98 101
99struct btrfs_delayed_tree_ref { 102struct btrfs_delayed_tree_ref {
100 struct btrfs_delayed_ref_node node; 103 struct btrfs_delayed_ref_node node;
101 union { 104 u64 root;
102 u64 root; 105 u64 parent;
103 u64 parent;
104 };
105 int level; 106 int level;
106}; 107};
107 108
108struct btrfs_delayed_data_ref { 109struct btrfs_delayed_data_ref {
109 struct btrfs_delayed_ref_node node; 110 struct btrfs_delayed_ref_node node;
110 union { 111 u64 root;
111 u64 root; 112 u64 parent;
112 u64 parent;
113 };
114 u64 objectid; 113 u64 objectid;
115 u64 offset; 114 u64 offset;
116}; 115};
@@ -140,6 +139,26 @@ struct btrfs_delayed_ref_root {
140 int flushing; 139 int flushing;
141 140
142 u64 run_delayed_start; 141 u64 run_delayed_start;
142
143 /*
144 * seq number of delayed refs. We need to know if a backref was being
145 * added before the currently processed ref or afterwards.
146 */
147 u64 seq;
148
149 /*
150 * seq_list holds a list of all seq numbers that are currently being
151 * added to the list. While walking backrefs (btrfs_find_all_roots,
152 * qgroups), which might take some time, no newer ref must be processed,
153 * as it might influence the outcome of the walk.
154 */
155 struct list_head seq_head;
156
157 /*
158 * when the only refs we have in the list must not be processed, we want
159 * to wait for more refs to show up or for the end of backref walking.
160 */
161 wait_queue_head_t seq_wait;
143}; 162};
144 163
145static inline void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref) 164static inline void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref)
@@ -151,16 +170,21 @@ static inline void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref)
151 } 170 }
152} 171}
153 172
154int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans, 173int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
174 struct btrfs_trans_handle *trans,
155 u64 bytenr, u64 num_bytes, u64 parent, 175 u64 bytenr, u64 num_bytes, u64 parent,
156 u64 ref_root, int level, int action, 176 u64 ref_root, int level, int action,
157 struct btrfs_delayed_extent_op *extent_op); 177 struct btrfs_delayed_extent_op *extent_op,
158int btrfs_add_delayed_data_ref(struct btrfs_trans_handle *trans, 178 int for_cow);
179int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
180 struct btrfs_trans_handle *trans,
159 u64 bytenr, u64 num_bytes, 181 u64 bytenr, u64 num_bytes,
160 u64 parent, u64 ref_root, 182 u64 parent, u64 ref_root,
161 u64 owner, u64 offset, int action, 183 u64 owner, u64 offset, int action,
162 struct btrfs_delayed_extent_op *extent_op); 184 struct btrfs_delayed_extent_op *extent_op,
163int btrfs_add_delayed_extent_op(struct btrfs_trans_handle *trans, 185 int for_cow);
186int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
187 struct btrfs_trans_handle *trans,
164 u64 bytenr, u64 num_bytes, 188 u64 bytenr, u64 num_bytes,
165 struct btrfs_delayed_extent_op *extent_op); 189 struct btrfs_delayed_extent_op *extent_op);
166 190
@@ -170,6 +194,60 @@ int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
170 struct btrfs_delayed_ref_head *head); 194 struct btrfs_delayed_ref_head *head);
171int btrfs_find_ref_cluster(struct btrfs_trans_handle *trans, 195int btrfs_find_ref_cluster(struct btrfs_trans_handle *trans,
172 struct list_head *cluster, u64 search_start); 196 struct list_head *cluster, u64 search_start);
197
198struct seq_list {
199 struct list_head list;
200 u64 seq;
201};
202
203static inline u64 inc_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs)
204{
205 assert_spin_locked(&delayed_refs->lock);
206 ++delayed_refs->seq;
207 return delayed_refs->seq;
208}
209
210static inline void
211btrfs_get_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs,
212 struct seq_list *elem)
213{
214 assert_spin_locked(&delayed_refs->lock);
215 elem->seq = delayed_refs->seq;
216 list_add_tail(&elem->list, &delayed_refs->seq_head);
217}
218
219static inline void
220btrfs_put_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs,
221 struct seq_list *elem)
222{
223 spin_lock(&delayed_refs->lock);
224 list_del(&elem->list);
225 wake_up(&delayed_refs->seq_wait);
226 spin_unlock(&delayed_refs->lock);
227}
228
229int btrfs_check_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs,
230 u64 seq);
231
232/*
233 * delayed refs with a ref_seq > 0 must be held back during backref walking.
234 * this only applies to items in one of the fs-trees. for_cow items never need
235 * to be held back, so they won't get a ref_seq number.
236 */
237static inline int need_ref_seq(int for_cow, u64 rootid)
238{
239 if (for_cow)
240 return 0;
241
242 if (rootid == BTRFS_FS_TREE_OBJECTID)
243 return 1;
244
245 if ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)
246 return 1;
247
248 return 0;
249}
250
173/* 251/*
174 * a node might live in a head or a regular ref, this lets you 252 * a node might live in a head or a regular ref, this lets you
175 * test for the proper type to use. 253 * test for the proper type to use.
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e5167219c266..9be97716c5e0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1243,7 +1243,8 @@ static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1243 root->ref_cows = 0; 1243 root->ref_cows = 0;
1244 1244
1245 leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 1245 leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
1246 BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0); 1246 BTRFS_TREE_LOG_OBJECTID, NULL,
1247 0, 0, 0, 0);
1247 if (IS_ERR(leaf)) { 1248 if (IS_ERR(leaf)) {
1248 kfree(root); 1249 kfree(root);
1249 return ERR_CAST(leaf); 1250 return ERR_CAST(leaf);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 1c1cf216be80..a44072a692ab 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1871,20 +1871,24 @@ static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
1871int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 1871int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1872 struct btrfs_root *root, 1872 struct btrfs_root *root,
1873 u64 bytenr, u64 num_bytes, u64 parent, 1873 u64 bytenr, u64 num_bytes, u64 parent,
1874 u64 root_objectid, u64 owner, u64 offset) 1874 u64 root_objectid, u64 owner, u64 offset, int for_cow)
1875{ 1875{
1876 int ret; 1876 int ret;
1877 struct btrfs_fs_info *fs_info = root->fs_info;
1878
1877 BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID && 1879 BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID &&
1878 root_objectid == BTRFS_TREE_LOG_OBJECTID); 1880 root_objectid == BTRFS_TREE_LOG_OBJECTID);
1879 1881
1880 if (owner < BTRFS_FIRST_FREE_OBJECTID) { 1882 if (owner < BTRFS_FIRST_FREE_OBJECTID) {
1881 ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, 1883 ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
1884 num_bytes,
1882 parent, root_objectid, (int)owner, 1885 parent, root_objectid, (int)owner,
1883 BTRFS_ADD_DELAYED_REF, NULL); 1886 BTRFS_ADD_DELAYED_REF, NULL, for_cow);
1884 } else { 1887 } else {
1885 ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, 1888 ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr,
1889 num_bytes,
1886 parent, root_objectid, owner, offset, 1890 parent, root_objectid, owner, offset,
1887 BTRFS_ADD_DELAYED_REF, NULL); 1891 BTRFS_ADD_DELAYED_REF, NULL, for_cow);
1888 } 1892 }
1889 return ret; 1893 return ret;
1890} 1894}
@@ -2232,6 +2236,28 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
2232 } 2236 }
2233 2237
2234 /* 2238 /*
2239 * locked_ref is the head node, so we have to go one
2240 * node back for any delayed ref updates
2241 */
2242 ref = select_delayed_ref(locked_ref);
2243
2244 if (ref && ref->seq &&
2245 btrfs_check_delayed_seq(delayed_refs, ref->seq)) {
2246 /*
2247 * there are still refs with lower seq numbers in the
2248 * process of being added. Don't run this ref yet.
2249 */
2250 list_del_init(&locked_ref->cluster);
2251 mutex_unlock(&locked_ref->mutex);
2252 locked_ref = NULL;
2253 delayed_refs->num_heads_ready++;
2254 spin_unlock(&delayed_refs->lock);
2255 cond_resched();
2256 spin_lock(&delayed_refs->lock);
2257 continue;
2258 }
2259
2260 /*
2235 * record the must insert reserved flag before we 2261 * record the must insert reserved flag before we
2236 * drop the spin lock. 2262 * drop the spin lock.
2237 */ 2263 */
@@ -2241,11 +2267,6 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
2241 extent_op = locked_ref->extent_op; 2267 extent_op = locked_ref->extent_op;
2242 locked_ref->extent_op = NULL; 2268 locked_ref->extent_op = NULL;
2243 2269
2244 /*
2245 * locked_ref is the head node, so we have to go one
2246 * node back for any delayed ref updates
2247 */
2248 ref = select_delayed_ref(locked_ref);
2249 if (!ref) { 2270 if (!ref) {
2250 /* All delayed refs have been processed, Go ahead 2271 /* All delayed refs have been processed, Go ahead
2251 * and send the head node to run_one_delayed_ref, 2272 * and send the head node to run_one_delayed_ref,
@@ -2276,7 +2297,12 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
2276 ref->in_tree = 0; 2297 ref->in_tree = 0;
2277 rb_erase(&ref->rb_node, &delayed_refs->root); 2298 rb_erase(&ref->rb_node, &delayed_refs->root);
2278 delayed_refs->num_entries--; 2299 delayed_refs->num_entries--;
2279 2300 /*
2301 * we modified num_entries, but as we're currently running
2302 * delayed refs, skip
2303 * wake_up(&delayed_refs->seq_wait);
2304 * here.
2305 */
2280 spin_unlock(&delayed_refs->lock); 2306 spin_unlock(&delayed_refs->lock);
2281 2307
2282 ret = run_one_delayed_ref(trans, root, ref, extent_op, 2308 ret = run_one_delayed_ref(trans, root, ref, extent_op,
@@ -2297,6 +2323,23 @@ next:
2297 return count; 2323 return count;
2298} 2324}
2299 2325
2326
2327static void wait_for_more_refs(struct btrfs_delayed_ref_root *delayed_refs,
2328 unsigned long num_refs)
2329{
2330 struct list_head *first_seq = delayed_refs->seq_head.next;
2331
2332 spin_unlock(&delayed_refs->lock);
2333 pr_debug("waiting for more refs (num %ld, first %p)\n",
2334 num_refs, first_seq);
2335 wait_event(delayed_refs->seq_wait,
2336 num_refs != delayed_refs->num_entries ||
2337 delayed_refs->seq_head.next != first_seq);
2338 pr_debug("done waiting for more refs (num %ld, first %p)\n",
2339 delayed_refs->num_entries, delayed_refs->seq_head.next);
2340 spin_lock(&delayed_refs->lock);
2341}
2342
2300/* 2343/*
2301 * this starts processing the delayed reference count updates and 2344 * this starts processing the delayed reference count updates and
2302 * extent insertions we have queued up so far. count can be 2345 * extent insertions we have queued up so far. count can be
@@ -2312,8 +2355,11 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2312 struct btrfs_delayed_ref_node *ref; 2355 struct btrfs_delayed_ref_node *ref;
2313 struct list_head cluster; 2356 struct list_head cluster;
2314 int ret; 2357 int ret;
2358 u64 delayed_start;
2315 int run_all = count == (unsigned long)-1; 2359 int run_all = count == (unsigned long)-1;
2316 int run_most = 0; 2360 int run_most = 0;
2361 unsigned long num_refs = 0;
2362 int consider_waiting;
2317 2363
2318 if (root == root->fs_info->extent_root) 2364 if (root == root->fs_info->extent_root)
2319 root = root->fs_info->tree_root; 2365 root = root->fs_info->tree_root;
@@ -2325,6 +2371,7 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2325 delayed_refs = &trans->transaction->delayed_refs; 2371 delayed_refs = &trans->transaction->delayed_refs;
2326 INIT_LIST_HEAD(&cluster); 2372 INIT_LIST_HEAD(&cluster);
2327again: 2373again:
2374 consider_waiting = 0;
2328 spin_lock(&delayed_refs->lock); 2375 spin_lock(&delayed_refs->lock);
2329 if (count == 0) { 2376 if (count == 0) {
2330 count = delayed_refs->num_entries * 2; 2377 count = delayed_refs->num_entries * 2;
@@ -2341,11 +2388,35 @@ again:
2341 * of refs to process starting at the first one we are able to 2388 * of refs to process starting at the first one we are able to
2342 * lock 2389 * lock
2343 */ 2390 */
2391 delayed_start = delayed_refs->run_delayed_start;
2344 ret = btrfs_find_ref_cluster(trans, &cluster, 2392 ret = btrfs_find_ref_cluster(trans, &cluster,
2345 delayed_refs->run_delayed_start); 2393 delayed_refs->run_delayed_start);
2346 if (ret) 2394 if (ret)
2347 break; 2395 break;
2348 2396
2397 if (delayed_start >= delayed_refs->run_delayed_start) {
2398 if (consider_waiting == 0) {
2399 /*
2400 * btrfs_find_ref_cluster looped. let's do one
2401 * more cycle. if we don't run any delayed ref
2402 * during that cycle (because we can't because
2403 * all of them are blocked) and if the number of
2404 * refs doesn't change, we avoid busy waiting.
2405 */
2406 consider_waiting = 1;
2407 num_refs = delayed_refs->num_entries;
2408 } else {
2409 wait_for_more_refs(delayed_refs, num_refs);
2410 /*
2411 * after waiting, things have changed. we
2412 * dropped the lock and someone else might have
2413 * run some refs, built new clusters and so on.
2414 * therefore, we restart staleness detection.
2415 */
2416 consider_waiting = 0;
2417 }
2418 }
2419
2349 ret = run_clustered_refs(trans, root, &cluster); 2420 ret = run_clustered_refs(trans, root, &cluster);
2350 BUG_ON(ret < 0); 2421 BUG_ON(ret < 0);
2351 2422
@@ -2353,6 +2424,11 @@ again:
2353 2424
2354 if (count == 0) 2425 if (count == 0)
2355 break; 2426 break;
2427
2428 if (ret || delayed_refs->run_delayed_start == 0) {
2429 /* refs were run, let's reset staleness detection */
2430 consider_waiting = 0;
2431 }
2356 } 2432 }
2357 2433
2358 if (run_all) { 2434 if (run_all) {
@@ -2410,7 +2486,8 @@ int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2410 extent_op->update_key = 0; 2486 extent_op->update_key = 0;
2411 extent_op->is_data = is_data ? 1 : 0; 2487 extent_op->is_data = is_data ? 1 : 0;
2412 2488
2413 ret = btrfs_add_delayed_extent_op(trans, bytenr, num_bytes, extent_op); 2489 ret = btrfs_add_delayed_extent_op(root->fs_info, trans, bytenr,
2490 num_bytes, extent_op);
2414 if (ret) 2491 if (ret)
2415 kfree(extent_op); 2492 kfree(extent_op);
2416 return ret; 2493 return ret;
@@ -2595,7 +2672,7 @@ out:
2595static int __btrfs_mod_ref(struct btrfs_trans_handle *trans, 2672static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
2596 struct btrfs_root *root, 2673 struct btrfs_root *root,
2597 struct extent_buffer *buf, 2674 struct extent_buffer *buf,
2598 int full_backref, int inc) 2675 int full_backref, int inc, int for_cow)
2599{ 2676{
2600 u64 bytenr; 2677 u64 bytenr;
2601 u64 num_bytes; 2678 u64 num_bytes;
@@ -2608,7 +2685,7 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
2608 int level; 2685 int level;
2609 int ret = 0; 2686 int ret = 0;
2610 int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, 2687 int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *,
2611 u64, u64, u64, u64, u64, u64); 2688 u64, u64, u64, u64, u64, u64, int);
2612 2689
2613 ref_root = btrfs_header_owner(buf); 2690 ref_root = btrfs_header_owner(buf);
2614 nritems = btrfs_header_nritems(buf); 2691 nritems = btrfs_header_nritems(buf);
@@ -2645,14 +2722,15 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
2645 key.offset -= btrfs_file_extent_offset(buf, fi); 2722 key.offset -= btrfs_file_extent_offset(buf, fi);
2646 ret = process_func(trans, root, bytenr, num_bytes, 2723 ret = process_func(trans, root, bytenr, num_bytes,
2647 parent, ref_root, key.objectid, 2724 parent, ref_root, key.objectid,
2648 key.offset); 2725 key.offset, for_cow);
2649 if (ret) 2726 if (ret)
2650 goto fail; 2727 goto fail;
2651 } else { 2728 } else {
2652 bytenr = btrfs_node_blockptr(buf, i); 2729 bytenr = btrfs_node_blockptr(buf, i);
2653 num_bytes = btrfs_level_size(root, level - 1); 2730 num_bytes = btrfs_level_size(root, level - 1);
2654 ret = process_func(trans, root, bytenr, num_bytes, 2731 ret = process_func(trans, root, bytenr, num_bytes,
2655 parent, ref_root, level - 1, 0); 2732 parent, ref_root, level - 1, 0,
2733 for_cow);
2656 if (ret) 2734 if (ret)
2657 goto fail; 2735 goto fail;
2658 } 2736 }
@@ -2664,15 +2742,15 @@ fail:
2664} 2742}
2665 2743
2666int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2744int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2667 struct extent_buffer *buf, int full_backref) 2745 struct extent_buffer *buf, int full_backref, int for_cow)
2668{ 2746{
2669 return __btrfs_mod_ref(trans, root, buf, full_backref, 1); 2747 return __btrfs_mod_ref(trans, root, buf, full_backref, 1, for_cow);
2670} 2748}
2671 2749
2672int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2750int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2673 struct extent_buffer *buf, int full_backref) 2751 struct extent_buffer *buf, int full_backref, int for_cow)
2674{ 2752{
2675 return __btrfs_mod_ref(trans, root, buf, full_backref, 0); 2753 return __btrfs_mod_ref(trans, root, buf, full_backref, 0, for_cow);
2676} 2754}
2677 2755
2678static int write_one_cache_group(struct btrfs_trans_handle *trans, 2756static int write_one_cache_group(struct btrfs_trans_handle *trans,
@@ -4954,6 +5032,8 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
4954 rb_erase(&head->node.rb_node, &delayed_refs->root); 5032 rb_erase(&head->node.rb_node, &delayed_refs->root);
4955 5033
4956 delayed_refs->num_entries--; 5034 delayed_refs->num_entries--;
5035 if (waitqueue_active(&delayed_refs->seq_wait))
5036 wake_up(&delayed_refs->seq_wait);
4957 5037
4958 /* 5038 /*
4959 * we don't take a ref on the node because we're removing it from the 5039 * we don't take a ref on the node because we're removing it from the
@@ -4981,16 +5061,17 @@ out:
4981void btrfs_free_tree_block(struct btrfs_trans_handle *trans, 5061void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
4982 struct btrfs_root *root, 5062 struct btrfs_root *root,
4983 struct extent_buffer *buf, 5063 struct extent_buffer *buf,
4984 u64 parent, int last_ref) 5064 u64 parent, int last_ref, int for_cow)
4985{ 5065{
4986 struct btrfs_block_group_cache *cache = NULL; 5066 struct btrfs_block_group_cache *cache = NULL;
4987 int ret; 5067 int ret;
4988 5068
4989 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { 5069 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
4990 ret = btrfs_add_delayed_tree_ref(trans, buf->start, buf->len, 5070 ret = btrfs_add_delayed_tree_ref(root->fs_info, trans,
4991 parent, root->root_key.objectid, 5071 buf->start, buf->len,
4992 btrfs_header_level(buf), 5072 parent, root->root_key.objectid,
4993 BTRFS_DROP_DELAYED_REF, NULL); 5073 btrfs_header_level(buf),
5074 BTRFS_DROP_DELAYED_REF, NULL, for_cow);
4994 BUG_ON(ret); 5075 BUG_ON(ret);
4995 } 5076 }
4996 5077
@@ -5025,12 +5106,12 @@ out:
5025 btrfs_put_block_group(cache); 5106 btrfs_put_block_group(cache);
5026} 5107}
5027 5108
5028int btrfs_free_extent(struct btrfs_trans_handle *trans, 5109int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root,
5029 struct btrfs_root *root, 5110 u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
5030 u64 bytenr, u64 num_bytes, u64 parent, 5111 u64 owner, u64 offset, int for_cow)
5031 u64 root_objectid, u64 owner, u64 offset)
5032{ 5112{
5033 int ret; 5113 int ret;
5114 struct btrfs_fs_info *fs_info = root->fs_info;
5034 5115
5035 /* 5116 /*
5036 * tree log blocks never actually go into the extent allocation 5117 * tree log blocks never actually go into the extent allocation
@@ -5042,14 +5123,17 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans,
5042 btrfs_pin_extent(root, bytenr, num_bytes, 1); 5123 btrfs_pin_extent(root, bytenr, num_bytes, 1);
5043 ret = 0; 5124 ret = 0;
5044 } else if (owner < BTRFS_FIRST_FREE_OBJECTID) { 5125 } else if (owner < BTRFS_FIRST_FREE_OBJECTID) {
5045 ret = btrfs_add_delayed_tree_ref(trans, bytenr, num_bytes, 5126 ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
5127 num_bytes,
5046 parent, root_objectid, (int)owner, 5128 parent, root_objectid, (int)owner,
5047 BTRFS_DROP_DELAYED_REF, NULL); 5129 BTRFS_DROP_DELAYED_REF, NULL, for_cow);
5048 BUG_ON(ret); 5130 BUG_ON(ret);
5049 } else { 5131 } else {
5050 ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, 5132 ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr,
5051 parent, root_objectid, owner, 5133 num_bytes,
5052 offset, BTRFS_DROP_DELAYED_REF, NULL); 5134 parent, root_objectid, owner,
5135 offset, BTRFS_DROP_DELAYED_REF,
5136 NULL, for_cow);
5053 BUG_ON(ret); 5137 BUG_ON(ret);
5054 } 5138 }
5055 return ret; 5139 return ret;
@@ -5877,9 +5961,10 @@ int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
5877 5961
5878 BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID); 5962 BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID);
5879 5963
5880 ret = btrfs_add_delayed_data_ref(trans, ins->objectid, ins->offset, 5964 ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid,
5881 0, root_objectid, owner, offset, 5965 ins->offset, 0,
5882 BTRFS_ADD_DELAYED_EXTENT, NULL); 5966 root_objectid, owner, offset,
5967 BTRFS_ADD_DELAYED_EXTENT, NULL, 0);
5883 return ret; 5968 return ret;
5884} 5969}
5885 5970
@@ -6049,7 +6134,7 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
6049 struct btrfs_root *root, u32 blocksize, 6134 struct btrfs_root *root, u32 blocksize,
6050 u64 parent, u64 root_objectid, 6135 u64 parent, u64 root_objectid,
6051 struct btrfs_disk_key *key, int level, 6136 struct btrfs_disk_key *key, int level,
6052 u64 hint, u64 empty_size) 6137 u64 hint, u64 empty_size, int for_cow)
6053{ 6138{
6054 struct btrfs_key ins; 6139 struct btrfs_key ins;
6055 struct btrfs_block_rsv *block_rsv; 6140 struct btrfs_block_rsv *block_rsv;
@@ -6093,10 +6178,11 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
6093 extent_op->update_flags = 1; 6178 extent_op->update_flags = 1;
6094 extent_op->is_data = 0; 6179 extent_op->is_data = 0;
6095 6180
6096 ret = btrfs_add_delayed_tree_ref(trans, ins.objectid, 6181 ret = btrfs_add_delayed_tree_ref(root->fs_info, trans,
6182 ins.objectid,
6097 ins.offset, parent, root_objectid, 6183 ins.offset, parent, root_objectid,
6098 level, BTRFS_ADD_DELAYED_EXTENT, 6184 level, BTRFS_ADD_DELAYED_EXTENT,
6099 extent_op); 6185 extent_op, for_cow);
6100 BUG_ON(ret); 6186 BUG_ON(ret);
6101 } 6187 }
6102 return buf; 6188 return buf;
@@ -6113,6 +6199,7 @@ struct walk_control {
6113 int keep_locks; 6199 int keep_locks;
6114 int reada_slot; 6200 int reada_slot;
6115 int reada_count; 6201 int reada_count;
6202 int for_reloc;
6116}; 6203};
6117 6204
6118#define DROP_REFERENCE 1 6205#define DROP_REFERENCE 1
@@ -6251,9 +6338,9 @@ static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
6251 /* wc->stage == UPDATE_BACKREF */ 6338 /* wc->stage == UPDATE_BACKREF */
6252 if (!(wc->flags[level] & flag)) { 6339 if (!(wc->flags[level] & flag)) {
6253 BUG_ON(!path->locks[level]); 6340 BUG_ON(!path->locks[level]);
6254 ret = btrfs_inc_ref(trans, root, eb, 1); 6341 ret = btrfs_inc_ref(trans, root, eb, 1, wc->for_reloc);
6255 BUG_ON(ret); 6342 BUG_ON(ret);
6256 ret = btrfs_dec_ref(trans, root, eb, 0); 6343 ret = btrfs_dec_ref(trans, root, eb, 0, wc->for_reloc);
6257 BUG_ON(ret); 6344 BUG_ON(ret);
6258 ret = btrfs_set_disk_extent_flags(trans, root, eb->start, 6345 ret = btrfs_set_disk_extent_flags(trans, root, eb->start,
6259 eb->len, flag, 0); 6346 eb->len, flag, 0);
@@ -6397,7 +6484,7 @@ skip:
6397 } 6484 }
6398 6485
6399 ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent, 6486 ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent,
6400 root->root_key.objectid, level - 1, 0); 6487 root->root_key.objectid, level - 1, 0, 0);
6401 BUG_ON(ret); 6488 BUG_ON(ret);
6402 } 6489 }
6403 btrfs_tree_unlock(next); 6490 btrfs_tree_unlock(next);
@@ -6471,9 +6558,11 @@ static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
6471 if (wc->refs[level] == 1) { 6558 if (wc->refs[level] == 1) {
6472 if (level == 0) { 6559 if (level == 0) {
6473 if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) 6560 if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF)
6474 ret = btrfs_dec_ref(trans, root, eb, 1); 6561 ret = btrfs_dec_ref(trans, root, eb, 1,
6562 wc->for_reloc);
6475 else 6563 else
6476 ret = btrfs_dec_ref(trans, root, eb, 0); 6564 ret = btrfs_dec_ref(trans, root, eb, 0,
6565 wc->for_reloc);
6477 BUG_ON(ret); 6566 BUG_ON(ret);
6478 } 6567 }
6479 /* make block locked assertion in clean_tree_block happy */ 6568 /* make block locked assertion in clean_tree_block happy */
@@ -6500,7 +6589,7 @@ static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
6500 btrfs_header_owner(path->nodes[level + 1])); 6589 btrfs_header_owner(path->nodes[level + 1]));
6501 } 6590 }
6502 6591
6503 btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); 6592 btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1, 0);
6504out: 6593out:
6505 wc->refs[level] = 0; 6594 wc->refs[level] = 0;
6506 wc->flags[level] = 0; 6595 wc->flags[level] = 0;
@@ -6584,7 +6673,8 @@ static noinline int walk_up_tree(struct btrfs_trans_handle *trans,
6584 * blocks are properly updated. 6673 * blocks are properly updated.
6585 */ 6674 */
6586void btrfs_drop_snapshot(struct btrfs_root *root, 6675void btrfs_drop_snapshot(struct btrfs_root *root,
6587 struct btrfs_block_rsv *block_rsv, int update_ref) 6676 struct btrfs_block_rsv *block_rsv, int update_ref,
6677 int for_reloc)
6588{ 6678{
6589 struct btrfs_path *path; 6679 struct btrfs_path *path;
6590 struct btrfs_trans_handle *trans; 6680 struct btrfs_trans_handle *trans;
@@ -6672,6 +6762,7 @@ void btrfs_drop_snapshot(struct btrfs_root *root,
6672 wc->stage = DROP_REFERENCE; 6762 wc->stage = DROP_REFERENCE;
6673 wc->update_ref = update_ref; 6763 wc->update_ref = update_ref;
6674 wc->keep_locks = 0; 6764 wc->keep_locks = 0;
6765 wc->for_reloc = for_reloc;
6675 wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); 6766 wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root);
6676 6767
6677 while (1) { 6768 while (1) {
@@ -6756,6 +6847,7 @@ out:
6756 * drop subtree rooted at tree block 'node'. 6847 * drop subtree rooted at tree block 'node'.
6757 * 6848 *
6758 * NOTE: this function will unlock and release tree block 'node' 6849 * NOTE: this function will unlock and release tree block 'node'
6850 * only used by relocation code
6759 */ 6851 */
6760int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 6852int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
6761 struct btrfs_root *root, 6853 struct btrfs_root *root,
@@ -6800,6 +6892,7 @@ int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
6800 wc->stage = DROP_REFERENCE; 6892 wc->stage = DROP_REFERENCE;
6801 wc->update_ref = 0; 6893 wc->update_ref = 0;
6802 wc->keep_locks = 1; 6894 wc->keep_locks = 1;
6895 wc->for_reloc = 1;
6803 wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root); 6896 wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root);
6804 6897
6805 while (1) { 6898 while (1) {
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 49f3c9dc09f4..3622cc22ff91 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3579,6 +3579,7 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
3579 atomic_set(&eb->blocking_writers, 0); 3579 atomic_set(&eb->blocking_writers, 0);
3580 atomic_set(&eb->spinning_readers, 0); 3580 atomic_set(&eb->spinning_readers, 0);
3581 atomic_set(&eb->spinning_writers, 0); 3581 atomic_set(&eb->spinning_writers, 0);
3582 eb->lock_nested = 0;
3582 init_waitqueue_head(&eb->write_lock_wq); 3583 init_waitqueue_head(&eb->write_lock_wq);
3583 init_waitqueue_head(&eb->read_lock_wq); 3584 init_waitqueue_head(&eb->read_lock_wq);
3584 3585
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 7604c3001322..bc6a042cb6fc 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -129,6 +129,7 @@ struct extent_buffer {
129 struct list_head leak_list; 129 struct list_head leak_list;
130 struct rcu_head rcu_head; 130 struct rcu_head rcu_head;
131 atomic_t refs; 131 atomic_t refs;
132 pid_t lock_owner;
132 133
133 /* count of read lock holders on the extent buffer */ 134 /* count of read lock holders on the extent buffer */
134 atomic_t write_locks; 135 atomic_t write_locks;
@@ -137,6 +138,7 @@ struct extent_buffer {
137 atomic_t blocking_readers; 138 atomic_t blocking_readers;
138 atomic_t spinning_readers; 139 atomic_t spinning_readers;
139 atomic_t spinning_writers; 140 atomic_t spinning_writers;
141 int lock_nested;
140 142
141 /* protects write locks */ 143 /* protects write locks */
142 rwlock_t lock; 144 rwlock_t lock;
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 97fbe939c050..fc97b00bd871 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -678,7 +678,7 @@ next_slot:
678 disk_bytenr, num_bytes, 0, 678 disk_bytenr, num_bytes, 0,
679 root->root_key.objectid, 679 root->root_key.objectid,
680 new_key.objectid, 680 new_key.objectid,
681 start - extent_offset); 681 start - extent_offset, 0);
682 BUG_ON(ret); 682 BUG_ON(ret);
683 *hint_byte = disk_bytenr; 683 *hint_byte = disk_bytenr;
684 } 684 }
@@ -753,7 +753,7 @@ next_slot:
753 disk_bytenr, num_bytes, 0, 753 disk_bytenr, num_bytes, 0,
754 root->root_key.objectid, 754 root->root_key.objectid,
755 key.objectid, key.offset - 755 key.objectid, key.offset -
756 extent_offset); 756 extent_offset, 0);
757 BUG_ON(ret); 757 BUG_ON(ret);
758 inode_sub_bytes(inode, 758 inode_sub_bytes(inode,
759 extent_end - key.offset); 759 extent_end - key.offset);
@@ -962,7 +962,7 @@ again:
962 962
963 ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0, 963 ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0,
964 root->root_key.objectid, 964 root->root_key.objectid,
965 ino, orig_offset); 965 ino, orig_offset, 0);
966 BUG_ON(ret); 966 BUG_ON(ret);
967 967
968 if (split == start) { 968 if (split == start) {
@@ -989,7 +989,7 @@ again:
989 del_nr++; 989 del_nr++;
990 ret = btrfs_free_extent(trans, root, bytenr, num_bytes, 990 ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
991 0, root->root_key.objectid, 991 0, root->root_key.objectid,
992 ino, orig_offset); 992 ino, orig_offset, 0);
993 BUG_ON(ret); 993 BUG_ON(ret);
994 } 994 }
995 other_start = 0; 995 other_start = 0;
@@ -1006,7 +1006,7 @@ again:
1006 del_nr++; 1006 del_nr++;
1007 ret = btrfs_free_extent(trans, root, bytenr, num_bytes, 1007 ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
1008 0, root->root_key.objectid, 1008 0, root->root_key.objectid,
1009 ino, orig_offset); 1009 ino, orig_offset, 0);
1010 BUG_ON(ret); 1010 BUG_ON(ret);
1011 } 1011 }
1012 if (del_nr == 0) { 1012 if (del_nr == 0) {
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index fd1a06df5bc6..acc4ff39ca4e 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3179,7 +3179,7 @@ delete:
3179 ret = btrfs_free_extent(trans, root, extent_start, 3179 ret = btrfs_free_extent(trans, root, extent_start,
3180 extent_num_bytes, 0, 3180 extent_num_bytes, 0,
3181 btrfs_header_owner(leaf), 3181 btrfs_header_owner(leaf),
3182 ino, extent_offset); 3182 ino, extent_offset, 0);
3183 BUG_ON(ret); 3183 BUG_ON(ret);
3184 } 3184 }
3185 3185
@@ -5121,7 +5121,7 @@ again:
5121 } 5121 }
5122 flush_dcache_page(page); 5122 flush_dcache_page(page);
5123 } else if (create && PageUptodate(page)) { 5123 } else if (create && PageUptodate(page)) {
5124 WARN_ON(1); 5124 BUG();
5125 if (!trans) { 5125 if (!trans) {
5126 kunmap(page); 5126 kunmap(page);
5127 free_extent_map(em); 5127 free_extent_map(em);
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index ef909b5d3d2e..7fdf22c2dc0d 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -368,7 +368,7 @@ static noinline int create_subvol(struct btrfs_root *root,
368 return PTR_ERR(trans); 368 return PTR_ERR(trans);
369 369
370 leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 370 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
371 0, objectid, NULL, 0, 0, 0); 371 0, objectid, NULL, 0, 0, 0, 0);
372 if (IS_ERR(leaf)) { 372 if (IS_ERR(leaf)) {
373 ret = PTR_ERR(leaf); 373 ret = PTR_ERR(leaf);
374 goto fail; 374 goto fail;
@@ -2468,7 +2468,8 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
2468 disko, diskl, 0, 2468 disko, diskl, 0,
2469 root->root_key.objectid, 2469 root->root_key.objectid,
2470 btrfs_ino(inode), 2470 btrfs_ino(inode),
2471 new_key.offset - datao); 2471 new_key.offset - datao,
2472 0);
2472 BUG_ON(ret); 2473 BUG_ON(ret);
2473 } 2474 }
2474 } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2475 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
@@ -3018,7 +3019,7 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3018{ 3019{
3019 int ret = 0; 3020 int ret = 0;
3020 int size; 3021 int size;
3021 u64 extent_offset; 3022 u64 extent_item_pos;
3022 struct btrfs_ioctl_logical_ino_args *loi; 3023 struct btrfs_ioctl_logical_ino_args *loi;
3023 struct btrfs_data_container *inodes = NULL; 3024 struct btrfs_data_container *inodes = NULL;
3024 struct btrfs_path *path = NULL; 3025 struct btrfs_path *path = NULL;
@@ -3049,15 +3050,17 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3049 } 3050 }
3050 3051
3051 ret = extent_from_logical(root->fs_info, loi->logical, path, &key); 3052 ret = extent_from_logical(root->fs_info, loi->logical, path, &key);
3053 btrfs_release_path(path);
3052 3054
3053 if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) 3055 if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK)
3054 ret = -ENOENT; 3056 ret = -ENOENT;
3055 if (ret < 0) 3057 if (ret < 0)
3056 goto out; 3058 goto out;
3057 3059
3058 extent_offset = loi->logical - key.objectid; 3060 extent_item_pos = loi->logical - key.objectid;
3059 ret = iterate_extent_inodes(root->fs_info, path, key.objectid, 3061 ret = iterate_extent_inodes(root->fs_info, path, key.objectid,
3060 extent_offset, build_ino_list, inodes); 3062 extent_item_pos, build_ino_list,
3063 inodes);
3061 3064
3062 if (ret < 0) 3065 if (ret < 0)
3063 goto out; 3066 goto out;
diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index d77b67c4b275..5e178d8f7167 100644
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -33,6 +33,14 @@ void btrfs_assert_tree_read_locked(struct extent_buffer *eb);
33 */ 33 */
34void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw) 34void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw)
35{ 35{
36 if (eb->lock_nested) {
37 read_lock(&eb->lock);
38 if (eb->lock_nested && current->pid == eb->lock_owner) {
39 read_unlock(&eb->lock);
40 return;
41 }
42 read_unlock(&eb->lock);
43 }
36 if (rw == BTRFS_WRITE_LOCK) { 44 if (rw == BTRFS_WRITE_LOCK) {
37 if (atomic_read(&eb->blocking_writers) == 0) { 45 if (atomic_read(&eb->blocking_writers) == 0) {
38 WARN_ON(atomic_read(&eb->spinning_writers) != 1); 46 WARN_ON(atomic_read(&eb->spinning_writers) != 1);
@@ -57,6 +65,14 @@ void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw)
57 */ 65 */
58void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw) 66void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw)
59{ 67{
68 if (eb->lock_nested) {
69 read_lock(&eb->lock);
70 if (&eb->lock_nested && current->pid == eb->lock_owner) {
71 read_unlock(&eb->lock);
72 return;
73 }
74 read_unlock(&eb->lock);
75 }
60 if (rw == BTRFS_WRITE_LOCK_BLOCKING) { 76 if (rw == BTRFS_WRITE_LOCK_BLOCKING) {
61 BUG_ON(atomic_read(&eb->blocking_writers) != 1); 77 BUG_ON(atomic_read(&eb->blocking_writers) != 1);
62 write_lock(&eb->lock); 78 write_lock(&eb->lock);
@@ -81,12 +97,25 @@ void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw)
81void btrfs_tree_read_lock(struct extent_buffer *eb) 97void btrfs_tree_read_lock(struct extent_buffer *eb)
82{ 98{
83again: 99again:
100 read_lock(&eb->lock);
101 if (atomic_read(&eb->blocking_writers) &&
102 current->pid == eb->lock_owner) {
103 /*
104 * This extent is already write-locked by our thread. We allow
105 * an additional read lock to be added because it's for the same
106 * thread. btrfs_find_all_roots() depends on this as it may be
107 * called on a partly (write-)locked tree.
108 */
109 BUG_ON(eb->lock_nested);
110 eb->lock_nested = 1;
111 read_unlock(&eb->lock);
112 return;
113 }
114 read_unlock(&eb->lock);
84 wait_event(eb->write_lock_wq, atomic_read(&eb->blocking_writers) == 0); 115 wait_event(eb->write_lock_wq, atomic_read(&eb->blocking_writers) == 0);
85 read_lock(&eb->lock); 116 read_lock(&eb->lock);
86 if (atomic_read(&eb->blocking_writers)) { 117 if (atomic_read(&eb->blocking_writers)) {
87 read_unlock(&eb->lock); 118 read_unlock(&eb->lock);
88 wait_event(eb->write_lock_wq,
89 atomic_read(&eb->blocking_writers) == 0);
90 goto again; 119 goto again;
91 } 120 }
92 atomic_inc(&eb->read_locks); 121 atomic_inc(&eb->read_locks);
@@ -129,6 +158,7 @@ int btrfs_try_tree_write_lock(struct extent_buffer *eb)
129 } 158 }
130 atomic_inc(&eb->write_locks); 159 atomic_inc(&eb->write_locks);
131 atomic_inc(&eb->spinning_writers); 160 atomic_inc(&eb->spinning_writers);
161 eb->lock_owner = current->pid;
132 return 1; 162 return 1;
133} 163}
134 164
@@ -137,6 +167,15 @@ int btrfs_try_tree_write_lock(struct extent_buffer *eb)
137 */ 167 */
138void btrfs_tree_read_unlock(struct extent_buffer *eb) 168void btrfs_tree_read_unlock(struct extent_buffer *eb)
139{ 169{
170 if (eb->lock_nested) {
171 read_lock(&eb->lock);
172 if (eb->lock_nested && current->pid == eb->lock_owner) {
173 eb->lock_nested = 0;
174 read_unlock(&eb->lock);
175 return;
176 }
177 read_unlock(&eb->lock);
178 }
140 btrfs_assert_tree_read_locked(eb); 179 btrfs_assert_tree_read_locked(eb);
141 WARN_ON(atomic_read(&eb->spinning_readers) == 0); 180 WARN_ON(atomic_read(&eb->spinning_readers) == 0);
142 atomic_dec(&eb->spinning_readers); 181 atomic_dec(&eb->spinning_readers);
@@ -149,6 +188,15 @@ void btrfs_tree_read_unlock(struct extent_buffer *eb)
149 */ 188 */
150void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb) 189void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb)
151{ 190{
191 if (eb->lock_nested) {
192 read_lock(&eb->lock);
193 if (eb->lock_nested && current->pid == eb->lock_owner) {
194 eb->lock_nested = 0;
195 read_unlock(&eb->lock);
196 return;
197 }
198 read_unlock(&eb->lock);
199 }
152 btrfs_assert_tree_read_locked(eb); 200 btrfs_assert_tree_read_locked(eb);
153 WARN_ON(atomic_read(&eb->blocking_readers) == 0); 201 WARN_ON(atomic_read(&eb->blocking_readers) == 0);
154 if (atomic_dec_and_test(&eb->blocking_readers)) 202 if (atomic_dec_and_test(&eb->blocking_readers))
@@ -181,6 +229,7 @@ again:
181 WARN_ON(atomic_read(&eb->spinning_writers)); 229 WARN_ON(atomic_read(&eb->spinning_writers));
182 atomic_inc(&eb->spinning_writers); 230 atomic_inc(&eb->spinning_writers);
183 atomic_inc(&eb->write_locks); 231 atomic_inc(&eb->write_locks);
232 eb->lock_owner = current->pid;
184 return 0; 233 return 0;
185} 234}
186 235
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index cfb55434a469..efe9f792544d 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -1604,12 +1604,12 @@ int replace_file_extents(struct btrfs_trans_handle *trans,
1604 ret = btrfs_inc_extent_ref(trans, root, new_bytenr, 1604 ret = btrfs_inc_extent_ref(trans, root, new_bytenr,
1605 num_bytes, parent, 1605 num_bytes, parent,
1606 btrfs_header_owner(leaf), 1606 btrfs_header_owner(leaf),
1607 key.objectid, key.offset); 1607 key.objectid, key.offset, 1);
1608 BUG_ON(ret); 1608 BUG_ON(ret);
1609 1609
1610 ret = btrfs_free_extent(trans, root, bytenr, num_bytes, 1610 ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
1611 parent, btrfs_header_owner(leaf), 1611 parent, btrfs_header_owner(leaf),
1612 key.objectid, key.offset); 1612 key.objectid, key.offset, 1);
1613 BUG_ON(ret); 1613 BUG_ON(ret);
1614 } 1614 }
1615 if (dirty) 1615 if (dirty)
@@ -1778,21 +1778,23 @@ again:
1778 1778
1779 ret = btrfs_inc_extent_ref(trans, src, old_bytenr, blocksize, 1779 ret = btrfs_inc_extent_ref(trans, src, old_bytenr, blocksize,
1780 path->nodes[level]->start, 1780 path->nodes[level]->start,
1781 src->root_key.objectid, level - 1, 0); 1781 src->root_key.objectid, level - 1, 0,
1782 1);
1782 BUG_ON(ret); 1783 BUG_ON(ret);
1783 ret = btrfs_inc_extent_ref(trans, dest, new_bytenr, blocksize, 1784 ret = btrfs_inc_extent_ref(trans, dest, new_bytenr, blocksize,
1784 0, dest->root_key.objectid, level - 1, 1785 0, dest->root_key.objectid, level - 1,
1785 0); 1786 0, 1);
1786 BUG_ON(ret); 1787 BUG_ON(ret);
1787 1788
1788 ret = btrfs_free_extent(trans, src, new_bytenr, blocksize, 1789 ret = btrfs_free_extent(trans, src, new_bytenr, blocksize,
1789 path->nodes[level]->start, 1790 path->nodes[level]->start,
1790 src->root_key.objectid, level - 1, 0); 1791 src->root_key.objectid, level - 1, 0,
1792 1);
1791 BUG_ON(ret); 1793 BUG_ON(ret);
1792 1794
1793 ret = btrfs_free_extent(trans, dest, old_bytenr, blocksize, 1795 ret = btrfs_free_extent(trans, dest, old_bytenr, blocksize,
1794 0, dest->root_key.objectid, level - 1, 1796 0, dest->root_key.objectid, level - 1,
1795 0); 1797 0, 1);
1796 BUG_ON(ret); 1798 BUG_ON(ret);
1797 1799
1798 btrfs_unlock_up_safe(path, 0); 1800 btrfs_unlock_up_safe(path, 0);
@@ -2244,7 +2246,7 @@ again:
2244 } else { 2246 } else {
2245 list_del_init(&reloc_root->root_list); 2247 list_del_init(&reloc_root->root_list);
2246 } 2248 }
2247 btrfs_drop_snapshot(reloc_root, rc->block_rsv, 0); 2249 btrfs_drop_snapshot(reloc_root, rc->block_rsv, 0, 1);
2248 } 2250 }
2249 2251
2250 if (found) { 2252 if (found) {
@@ -2558,7 +2560,7 @@ static int do_relocation(struct btrfs_trans_handle *trans,
2558 node->eb->start, blocksize, 2560 node->eb->start, blocksize,
2559 upper->eb->start, 2561 upper->eb->start,
2560 btrfs_header_owner(upper->eb), 2562 btrfs_header_owner(upper->eb),
2561 node->level, 0); 2563 node->level, 0, 1);
2562 BUG_ON(ret); 2564 BUG_ON(ret);
2563 2565
2564 ret = btrfs_drop_subtree(trans, root, eb, upper->eb); 2566 ret = btrfs_drop_subtree(trans, root, eb, upper->eb);
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index ddf2c90d3fc0..6a6a51a809ba 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -309,7 +309,7 @@ static void scrub_print_warning(const char *errstr, struct scrub_bio *sbio,
309 u8 ref_level; 309 u8 ref_level;
310 unsigned long ptr = 0; 310 unsigned long ptr = 0;
311 const int bufsize = 4096; 311 const int bufsize = 4096;
312 u64 extent_offset; 312 u64 extent_item_pos;
313 313
314 path = btrfs_alloc_path(); 314 path = btrfs_alloc_path();
315 315
@@ -329,12 +329,13 @@ static void scrub_print_warning(const char *errstr, struct scrub_bio *sbio,
329 if (ret < 0) 329 if (ret < 0)
330 goto out; 330 goto out;
331 331
332 extent_offset = swarn.logical - found_key.objectid; 332 extent_item_pos = swarn.logical - found_key.objectid;
333 swarn.extent_item_size = found_key.offset; 333 swarn.extent_item_size = found_key.offset;
334 334
335 eb = path->nodes[0]; 335 eb = path->nodes[0];
336 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item); 336 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item);
337 item_size = btrfs_item_size_nr(eb, path->slots[0]); 337 item_size = btrfs_item_size_nr(eb, path->slots[0]);
338 btrfs_release_path(path);
338 339
339 if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) { 340 if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
340 do { 341 do {
@@ -351,7 +352,7 @@ static void scrub_print_warning(const char *errstr, struct scrub_bio *sbio,
351 } else { 352 } else {
352 swarn.path = path; 353 swarn.path = path;
353 iterate_extent_inodes(fs_info, path, found_key.objectid, 354 iterate_extent_inodes(fs_info, path, found_key.objectid,
354 extent_offset, 355 extent_item_pos,
355 scrub_print_warning_inode, &swarn); 356 scrub_print_warning_inode, &swarn);
356 } 357 }
357 358
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 360c2dfd1ee6..d5f987b49d70 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -36,6 +36,8 @@ static noinline void put_transaction(struct btrfs_transaction *transaction)
36 WARN_ON(atomic_read(&transaction->use_count) == 0); 36 WARN_ON(atomic_read(&transaction->use_count) == 0);
37 if (atomic_dec_and_test(&transaction->use_count)) { 37 if (atomic_dec_and_test(&transaction->use_count)) {
38 BUG_ON(!list_empty(&transaction->list)); 38 BUG_ON(!list_empty(&transaction->list));
39 WARN_ON(transaction->delayed_refs.root.rb_node);
40 WARN_ON(!list_empty(&transaction->delayed_refs.seq_head));
39 memset(transaction, 0, sizeof(*transaction)); 41 memset(transaction, 0, sizeof(*transaction));
40 kmem_cache_free(btrfs_transaction_cachep, transaction); 42 kmem_cache_free(btrfs_transaction_cachep, transaction);
41 } 43 }
@@ -108,8 +110,11 @@ loop:
108 cur_trans->delayed_refs.num_heads = 0; 110 cur_trans->delayed_refs.num_heads = 0;
109 cur_trans->delayed_refs.flushing = 0; 111 cur_trans->delayed_refs.flushing = 0;
110 cur_trans->delayed_refs.run_delayed_start = 0; 112 cur_trans->delayed_refs.run_delayed_start = 0;
113 cur_trans->delayed_refs.seq = 1;
114 init_waitqueue_head(&cur_trans->delayed_refs.seq_wait);
111 spin_lock_init(&cur_trans->commit_lock); 115 spin_lock_init(&cur_trans->commit_lock);
112 spin_lock_init(&cur_trans->delayed_refs.lock); 116 spin_lock_init(&cur_trans->delayed_refs.lock);
117 INIT_LIST_HEAD(&cur_trans->delayed_refs.seq_head);
113 118
114 INIT_LIST_HEAD(&cur_trans->pending_snapshots); 119 INIT_LIST_HEAD(&cur_trans->pending_snapshots);
115 list_add_tail(&cur_trans->list, &root->fs_info->trans_list); 120 list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
@@ -1386,9 +1391,9 @@ int btrfs_clean_old_snapshots(struct btrfs_root *root)
1386 1391
1387 if (btrfs_header_backref_rev(root->node) < 1392 if (btrfs_header_backref_rev(root->node) <
1388 BTRFS_MIXED_BACKREF_REV) 1393 BTRFS_MIXED_BACKREF_REV)
1389 btrfs_drop_snapshot(root, NULL, 0); 1394 btrfs_drop_snapshot(root, NULL, 0, 0);
1390 else 1395 else
1391 btrfs_drop_snapshot(root, NULL, 1); 1396 btrfs_drop_snapshot(root, NULL, 1, 0);
1392 } 1397 }
1393 return 0; 1398 return 0;
1394} 1399}
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 3568374d419d..cb877e0886a7 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -589,7 +589,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
589 ret = btrfs_inc_extent_ref(trans, root, 589 ret = btrfs_inc_extent_ref(trans, root,
590 ins.objectid, ins.offset, 590 ins.objectid, ins.offset,
591 0, root->root_key.objectid, 591 0, root->root_key.objectid,
592 key->objectid, offset); 592 key->objectid, offset, 0);
593 BUG_ON(ret); 593 BUG_ON(ret);
594 } else { 594 } else {
595 /* 595 /*
diff --git a/fs/btrfs/ulist.c b/fs/btrfs/ulist.c
new file mode 100644
index 000000000000..12f5147bd2b1
--- /dev/null
+++ b/fs/btrfs/ulist.c
@@ -0,0 +1,220 @@
1/*
2 * Copyright (C) 2011 STRATO AG
3 * written by Arne Jansen <sensille@gmx.net>
4 * Distributed under the GNU GPL license version 2.
5 */
6
7#include <linux/slab.h>
8#include <linux/module.h>
9#include "ulist.h"
10
11/*
12 * ulist is a generic data structure to hold a collection of unique u64
13 * values. The only operations it supports is adding to the list and
14 * enumerating it.
15 * It is possible to store an auxiliary value along with the key.
16 *
17 * The implementation is preliminary and can probably be sped up
18 * significantly. A first step would be to store the values in an rbtree
19 * as soon as ULIST_SIZE is exceeded.
20 *
21 * A sample usage for ulists is the enumeration of directed graphs without
22 * visiting a node twice. The pseudo-code could look like this:
23 *
24 * ulist = ulist_alloc();
25 * ulist_add(ulist, root);
26 * elem = NULL;
27 *
28 * while ((elem = ulist_next(ulist, elem)) {
29 * for (all child nodes n in elem)
30 * ulist_add(ulist, n);
31 * do something useful with the node;
32 * }
33 * ulist_free(ulist);
34 *
35 * This assumes the graph nodes are adressable by u64. This stems from the
36 * usage for tree enumeration in btrfs, where the logical addresses are
37 * 64 bit.
38 *
39 * It is also useful for tree enumeration which could be done elegantly
40 * recursively, but is not possible due to kernel stack limitations. The
41 * loop would be similar to the above.
42 */
43
44/**
45 * ulist_init - freshly initialize a ulist
46 * @ulist: the ulist to initialize
47 *
48 * Note: don't use this function to init an already used ulist, use
49 * ulist_reinit instead.
50 */
51void ulist_init(struct ulist *ulist)
52{
53 ulist->nnodes = 0;
54 ulist->nodes = ulist->int_nodes;
55 ulist->nodes_alloced = ULIST_SIZE;
56}
57EXPORT_SYMBOL(ulist_init);
58
59/**
60 * ulist_fini - free up additionally allocated memory for the ulist
61 * @ulist: the ulist from which to free the additional memory
62 *
63 * This is useful in cases where the base 'struct ulist' has been statically
64 * allocated.
65 */
66void ulist_fini(struct ulist *ulist)
67{
68 /*
69 * The first ULIST_SIZE elements are stored inline in struct ulist.
70 * Only if more elements are alocated they need to be freed.
71 */
72 if (ulist->nodes_alloced > ULIST_SIZE)
73 kfree(ulist->nodes);
74 ulist->nodes_alloced = 0; /* in case ulist_fini is called twice */
75}
76EXPORT_SYMBOL(ulist_fini);
77
78/**
79 * ulist_reinit - prepare a ulist for reuse
80 * @ulist: ulist to be reused
81 *
82 * Free up all additional memory allocated for the list elements and reinit
83 * the ulist.
84 */
85void ulist_reinit(struct ulist *ulist)
86{
87 ulist_fini(ulist);
88 ulist_init(ulist);
89}
90EXPORT_SYMBOL(ulist_reinit);
91
92/**
93 * ulist_alloc - dynamically allocate a ulist
94 * @gfp_mask: allocation flags to for base allocation
95 *
96 * The allocated ulist will be returned in an initialized state.
97 */
98struct ulist *ulist_alloc(unsigned long gfp_mask)
99{
100 struct ulist *ulist = kmalloc(sizeof(*ulist), gfp_mask);
101
102 if (!ulist)
103 return NULL;
104
105 ulist_init(ulist);
106
107 return ulist;
108}
109EXPORT_SYMBOL(ulist_alloc);
110
111/**
112 * ulist_free - free dynamically allocated ulist
113 * @ulist: ulist to free
114 *
115 * It is not necessary to call ulist_fini before.
116 */
117void ulist_free(struct ulist *ulist)
118{
119 if (!ulist)
120 return;
121 ulist_fini(ulist);
122 kfree(ulist);
123}
124EXPORT_SYMBOL(ulist_free);
125
126/**
127 * ulist_add - add an element to the ulist
128 * @ulist: ulist to add the element to
129 * @val: value to add to ulist
130 * @aux: auxiliary value to store along with val
131 * @gfp_mask: flags to use for allocation
132 *
133 * Note: locking must be provided by the caller. In case of rwlocks write
134 * locking is needed
135 *
136 * Add an element to a ulist. The @val will only be added if it doesn't
137 * already exist. If it is added, the auxiliary value @aux is stored along with
138 * it. In case @val already exists in the ulist, @aux is ignored, even if
139 * it differs from the already stored value.
140 *
141 * ulist_add returns 0 if @val already exists in ulist and 1 if @val has been
142 * inserted.
143 * In case of allocation failure -ENOMEM is returned and the ulist stays
144 * unaltered.
145 */
146int ulist_add(struct ulist *ulist, u64 val, unsigned long aux,
147 unsigned long gfp_mask)
148{
149 int i;
150
151 for (i = 0; i < ulist->nnodes; ++i) {
152 if (ulist->nodes[i].val == val)
153 return 0;
154 }
155
156 if (ulist->nnodes >= ulist->nodes_alloced) {
157 u64 new_alloced = ulist->nodes_alloced + 128;
158 struct ulist_node *new_nodes;
159 void *old = NULL;
160
161 /*
162 * if nodes_alloced == ULIST_SIZE no memory has been allocated
163 * yet, so pass NULL to krealloc
164 */
165 if (ulist->nodes_alloced > ULIST_SIZE)
166 old = ulist->nodes;
167
168 new_nodes = krealloc(old, sizeof(*new_nodes) * new_alloced,
169 gfp_mask);
170 if (!new_nodes)
171 return -ENOMEM;
172
173 if (!old)
174 memcpy(new_nodes, ulist->int_nodes,
175 sizeof(ulist->int_nodes));
176
177 ulist->nodes = new_nodes;
178 ulist->nodes_alloced = new_alloced;
179 }
180 ulist->nodes[ulist->nnodes].val = val;
181 ulist->nodes[ulist->nnodes].aux = aux;
182 ++ulist->nnodes;
183
184 return 1;
185}
186EXPORT_SYMBOL(ulist_add);
187
188/**
189 * ulist_next - iterate ulist
190 * @ulist: ulist to iterate
191 * @prev: previously returned element or %NULL to start iteration
192 *
193 * Note: locking must be provided by the caller. In case of rwlocks only read
194 * locking is needed
195 *
196 * This function is used to iterate an ulist. The iteration is started with
197 * @prev = %NULL. It returns the next element from the ulist or %NULL when the
198 * end is reached. No guarantee is made with respect to the order in which
199 * the elements are returned. They might neither be returned in order of
200 * addition nor in ascending order.
201 * It is allowed to call ulist_add during an enumeration. Newly added items
202 * are guaranteed to show up in the running enumeration.
203 */
204struct ulist_node *ulist_next(struct ulist *ulist, struct ulist_node *prev)
205{
206 int next;
207
208 if (ulist->nnodes == 0)
209 return NULL;
210
211 if (!prev)
212 return &ulist->nodes[0];
213
214 next = (prev - ulist->nodes) + 1;
215 if (next < 0 || next >= ulist->nnodes)
216 return NULL;
217
218 return &ulist->nodes[next];
219}
220EXPORT_SYMBOL(ulist_next);
diff --git a/fs/btrfs/ulist.h b/fs/btrfs/ulist.h
new file mode 100644
index 000000000000..2e25dec58ec0
--- /dev/null
+++ b/fs/btrfs/ulist.h
@@ -0,0 +1,68 @@
1/*
2 * Copyright (C) 2011 STRATO AG
3 * written by Arne Jansen <sensille@gmx.net>
4 * Distributed under the GNU GPL license version 2.
5 *
6 */
7
8#ifndef __ULIST__
9#define __ULIST__
10
11/*
12 * ulist is a generic data structure to hold a collection of unique u64
13 * values. The only operations it supports is adding to the list and
14 * enumerating it.
15 * It is possible to store an auxiliary value along with the key.
16 *
17 * The implementation is preliminary and can probably be sped up
18 * significantly. A first step would be to store the values in an rbtree
19 * as soon as ULIST_SIZE is exceeded.
20 */
21
22/*
23 * number of elements statically allocated inside struct ulist
24 */
25#define ULIST_SIZE 16
26
27/*
28 * element of the list
29 */
30struct ulist_node {
31 u64 val; /* value to store */
32 unsigned long aux; /* auxiliary value saved along with the val */
33};
34
35struct ulist {
36 /*
37 * number of elements stored in list
38 */
39 unsigned long nnodes;
40
41 /*
42 * number of nodes we already have room for
43 */
44 unsigned long nodes_alloced;
45
46 /*
47 * pointer to the array storing the elements. The first ULIST_SIZE
48 * elements are stored inline. In this case the it points to int_nodes.
49 * After exceeding ULIST_SIZE, dynamic memory is allocated.
50 */
51 struct ulist_node *nodes;
52
53 /*
54 * inline storage space for the first ULIST_SIZE entries
55 */
56 struct ulist_node int_nodes[ULIST_SIZE];
57};
58
59void ulist_init(struct ulist *ulist);
60void ulist_fini(struct ulist *ulist);
61void ulist_reinit(struct ulist *ulist);
62struct ulist *ulist_alloc(unsigned long gfp_mask);
63void ulist_free(struct ulist *ulist);
64int ulist_add(struct ulist *ulist, u64 val, unsigned long aux,
65 unsigned long gfp_mask);
66struct ulist_node *ulist_next(struct ulist *ulist, struct ulist_node *prev);
67
68#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-30 09:35:49 -0400