2 * Copyright (C) 2009 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/sort.h>
23 #include "delayed-ref.h"
24 #include "transaction.h"
27 struct kmem_cache *btrfs_delayed_ref_head_cachep;
28 struct kmem_cache *btrfs_delayed_tree_ref_cachep;
29 struct kmem_cache *btrfs_delayed_data_ref_cachep;
30 struct kmem_cache *btrfs_delayed_extent_op_cachep;
32 * delayed back reference update tracking. For subvolume trees
33 * we queue up extent allocations and backref maintenance for
34 * delayed processing. This avoids deep call chains where we
35 * add extents in the middle of btrfs_search_slot, and it allows
36 * us to buffer up frequently modified backrefs in an rb tree instead
37 * of hammering updates on the extent allocation tree.
41 * compare two delayed tree backrefs with same bytenr and type
43 static int comp_tree_refs(struct btrfs_delayed_tree_ref *ref2,
44 struct btrfs_delayed_tree_ref *ref1, int type)
46 if (type == BTRFS_TREE_BLOCK_REF_KEY) {
47 if (ref1->root < ref2->root)
49 if (ref1->root > ref2->root)
52 if (ref1->parent < ref2->parent)
54 if (ref1->parent > ref2->parent)
61 * compare two delayed data backrefs with same bytenr and type
63 static int comp_data_refs(struct btrfs_delayed_data_ref *ref2,
64 struct btrfs_delayed_data_ref *ref1)
66 if (ref1->node.type == BTRFS_EXTENT_DATA_REF_KEY) {
67 if (ref1->root < ref2->root)
69 if (ref1->root > ref2->root)
71 if (ref1->objectid < ref2->objectid)
73 if (ref1->objectid > ref2->objectid)
75 if (ref1->offset < ref2->offset)
77 if (ref1->offset > ref2->offset)
80 if (ref1->parent < ref2->parent)
82 if (ref1->parent > ref2->parent)
88 /* insert a new ref to head ref rbtree */
89 static struct btrfs_delayed_ref_head *htree_insert(struct rb_root *root,
92 struct rb_node **p = &root->rb_node;
93 struct rb_node *parent_node = NULL;
94 struct btrfs_delayed_ref_head *entry;
95 struct btrfs_delayed_ref_head *ins;
98 ins = rb_entry(node, struct btrfs_delayed_ref_head, href_node);
99 bytenr = ins->node.bytenr;
102 entry = rb_entry(parent_node, struct btrfs_delayed_ref_head,
105 if (bytenr < entry->node.bytenr)
107 else if (bytenr > entry->node.bytenr)
113 rb_link_node(node, parent_node, p);
114 rb_insert_color(node, root);
119 * find an head entry based on bytenr. This returns the delayed ref
120 * head if it was able to find one, or NULL if nothing was in that spot.
121 * If return_bigger is given, the next bigger entry is returned if no exact
124 static struct btrfs_delayed_ref_head *
125 find_ref_head(struct rb_root *root, u64 bytenr,
129 struct btrfs_delayed_ref_head *entry;
134 entry = rb_entry(n, struct btrfs_delayed_ref_head, href_node);
136 if (bytenr < entry->node.bytenr)
138 else if (bytenr > entry->node.bytenr)
143 if (entry && return_bigger) {
144 if (bytenr > entry->node.bytenr) {
145 n = rb_next(&entry->href_node);
148 entry = rb_entry(n, struct btrfs_delayed_ref_head,
157 int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
158 struct btrfs_delayed_ref_head *head)
160 struct btrfs_delayed_ref_root *delayed_refs;
162 delayed_refs = &trans->transaction->delayed_refs;
163 assert_spin_locked(&delayed_refs->lock);
164 if (mutex_trylock(&head->mutex))
167 atomic_inc(&head->node.refs);
168 spin_unlock(&delayed_refs->lock);
170 mutex_lock(&head->mutex);
171 spin_lock(&delayed_refs->lock);
172 if (!head->node.in_tree) {
173 mutex_unlock(&head->mutex);
174 btrfs_put_delayed_ref(&head->node);
177 btrfs_put_delayed_ref(&head->node);
181 static inline void drop_delayed_ref(struct btrfs_trans_handle *trans,
182 struct btrfs_delayed_ref_root *delayed_refs,
183 struct btrfs_delayed_ref_head *head,
184 struct btrfs_delayed_ref_node *ref)
186 if (btrfs_delayed_ref_is_head(ref)) {
187 head = btrfs_delayed_node_to_head(ref);
188 rb_erase(&head->href_node, &delayed_refs->href_root);
190 assert_spin_locked(&head->lock);
191 list_del(&ref->list);
194 btrfs_put_delayed_ref(ref);
195 atomic_dec(&delayed_refs->num_entries);
196 if (trans->delayed_ref_updates)
197 trans->delayed_ref_updates--;
200 static bool merge_ref(struct btrfs_trans_handle *trans,
201 struct btrfs_delayed_ref_root *delayed_refs,
202 struct btrfs_delayed_ref_head *head,
203 struct btrfs_delayed_ref_node *ref,
206 struct btrfs_delayed_ref_node *next;
209 next = list_first_entry(&head->ref_list, struct btrfs_delayed_ref_node,
211 while (!done && &next->list != &head->ref_list) {
213 struct btrfs_delayed_ref_node *next2;
215 next2 = list_next_entry(next, list);
220 if (seq && next->seq >= seq)
223 if (next->type != ref->type || next->no_quota != ref->no_quota)
226 if ((ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
227 ref->type == BTRFS_SHARED_BLOCK_REF_KEY) &&
228 comp_tree_refs(btrfs_delayed_node_to_tree_ref(ref),
229 btrfs_delayed_node_to_tree_ref(next),
232 if ((ref->type == BTRFS_EXTENT_DATA_REF_KEY ||
233 ref->type == BTRFS_SHARED_DATA_REF_KEY) &&
234 comp_data_refs(btrfs_delayed_node_to_data_ref(ref),
235 btrfs_delayed_node_to_data_ref(next)))
238 if (ref->action == next->action) {
241 if (ref->ref_mod < next->ref_mod) {
245 mod = -next->ref_mod;
248 drop_delayed_ref(trans, delayed_refs, head, next);
250 if (ref->ref_mod == 0) {
251 drop_delayed_ref(trans, delayed_refs, head, ref);
255 * Can't have multiples of the same ref on a tree block.
257 WARN_ON(ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
258 ref->type == BTRFS_SHARED_BLOCK_REF_KEY);
267 void btrfs_merge_delayed_refs(struct btrfs_trans_handle *trans,
268 struct btrfs_fs_info *fs_info,
269 struct btrfs_delayed_ref_root *delayed_refs,
270 struct btrfs_delayed_ref_head *head)
272 struct btrfs_delayed_ref_node *ref;
275 assert_spin_locked(&head->lock);
277 if (list_empty(&head->ref_list))
280 /* We don't have too many refs to merge for data. */
284 spin_lock(&fs_info->tree_mod_seq_lock);
285 if (!list_empty(&fs_info->tree_mod_seq_list)) {
286 struct seq_list *elem;
288 elem = list_first_entry(&fs_info->tree_mod_seq_list,
289 struct seq_list, list);
292 spin_unlock(&fs_info->tree_mod_seq_lock);
294 ref = list_first_entry(&head->ref_list, struct btrfs_delayed_ref_node,
296 while (&ref->list != &head->ref_list) {
297 if (seq && ref->seq >= seq)
300 if (merge_ref(trans, delayed_refs, head, ref, seq)) {
301 if (list_empty(&head->ref_list))
303 ref = list_first_entry(&head->ref_list,
304 struct btrfs_delayed_ref_node,
309 ref = list_next_entry(ref, list);
313 int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info,
314 struct btrfs_delayed_ref_root *delayed_refs,
317 struct seq_list *elem;
320 spin_lock(&fs_info->tree_mod_seq_lock);
321 if (!list_empty(&fs_info->tree_mod_seq_list)) {
322 elem = list_first_entry(&fs_info->tree_mod_seq_list,
323 struct seq_list, list);
324 if (seq >= elem->seq) {
325 pr_debug("holding back delayed_ref %#x.%x, lowest is %#x.%x (%p)\n",
326 (u32)(seq >> 32), (u32)seq,
327 (u32)(elem->seq >> 32), (u32)elem->seq,
333 spin_unlock(&fs_info->tree_mod_seq_lock);
337 struct btrfs_delayed_ref_head *
338 btrfs_select_ref_head(struct btrfs_trans_handle *trans)
340 struct btrfs_delayed_ref_root *delayed_refs;
341 struct btrfs_delayed_ref_head *head;
345 delayed_refs = &trans->transaction->delayed_refs;
348 start = delayed_refs->run_delayed_start;
349 head = find_ref_head(&delayed_refs->href_root, start, 1);
350 if (!head && !loop) {
351 delayed_refs->run_delayed_start = 0;
354 head = find_ref_head(&delayed_refs->href_root, start, 1);
357 } else if (!head && loop) {
361 while (head->processing) {
362 struct rb_node *node;
364 node = rb_next(&head->href_node);
368 delayed_refs->run_delayed_start = 0;
373 head = rb_entry(node, struct btrfs_delayed_ref_head,
377 head->processing = 1;
378 WARN_ON(delayed_refs->num_heads_ready == 0);
379 delayed_refs->num_heads_ready--;
380 delayed_refs->run_delayed_start = head->node.bytenr +
381 head->node.num_bytes;
386 * Helper to insert the ref_node to the tail or merge with tail.
388 * Return 0 for insert.
389 * Return >0 for merge.
392 add_delayed_ref_tail_merge(struct btrfs_trans_handle *trans,
393 struct btrfs_delayed_ref_root *root,
394 struct btrfs_delayed_ref_head *href,
395 struct btrfs_delayed_ref_node *ref)
397 struct btrfs_delayed_ref_node *exist;
401 spin_lock(&href->lock);
402 /* Check whether we can merge the tail node with ref */
403 if (list_empty(&href->ref_list))
405 exist = list_entry(href->ref_list.prev, struct btrfs_delayed_ref_node,
407 /* No need to compare bytenr nor is_head */
408 if (exist->type != ref->type || exist->no_quota != ref->no_quota ||
409 exist->seq != ref->seq)
412 if ((exist->type == BTRFS_TREE_BLOCK_REF_KEY ||
413 exist->type == BTRFS_SHARED_BLOCK_REF_KEY) &&
414 comp_tree_refs(btrfs_delayed_node_to_tree_ref(exist),
415 btrfs_delayed_node_to_tree_ref(ref),
418 if ((exist->type == BTRFS_EXTENT_DATA_REF_KEY ||
419 exist->type == BTRFS_SHARED_DATA_REF_KEY) &&
420 comp_data_refs(btrfs_delayed_node_to_data_ref(exist),
421 btrfs_delayed_node_to_data_ref(ref)))
424 /* Now we are sure we can merge */
426 if (exist->action == ref->action) {
429 /* Need to change action */
430 if (exist->ref_mod < ref->ref_mod) {
431 exist->action = ref->action;
432 mod = -exist->ref_mod;
433 exist->ref_mod = ref->ref_mod;
437 exist->ref_mod += mod;
439 /* remove existing tail if its ref_mod is zero */
440 if (exist->ref_mod == 0)
441 drop_delayed_ref(trans, root, href, exist);
442 spin_unlock(&href->lock);
446 list_add_tail(&ref->list, &href->ref_list);
447 atomic_inc(&root->num_entries);
448 trans->delayed_ref_updates++;
449 spin_unlock(&href->lock);
454 * helper function to update the accounting in the head ref
455 * existing and update must have the same bytenr
458 update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
459 struct btrfs_delayed_ref_node *existing,
460 struct btrfs_delayed_ref_node *update)
462 struct btrfs_delayed_ref_head *existing_ref;
463 struct btrfs_delayed_ref_head *ref;
466 existing_ref = btrfs_delayed_node_to_head(existing);
467 ref = btrfs_delayed_node_to_head(update);
468 BUG_ON(existing_ref->is_data != ref->is_data);
470 spin_lock(&existing_ref->lock);
471 if (ref->must_insert_reserved) {
472 /* if the extent was freed and then
473 * reallocated before the delayed ref
474 * entries were processed, we can end up
475 * with an existing head ref without
476 * the must_insert_reserved flag set.
479 existing_ref->must_insert_reserved = ref->must_insert_reserved;
482 * update the num_bytes so we make sure the accounting
485 existing->num_bytes = update->num_bytes;
489 if (ref->extent_op) {
490 if (!existing_ref->extent_op) {
491 existing_ref->extent_op = ref->extent_op;
493 if (ref->extent_op->update_key) {
494 memcpy(&existing_ref->extent_op->key,
495 &ref->extent_op->key,
496 sizeof(ref->extent_op->key));
497 existing_ref->extent_op->update_key = 1;
499 if (ref->extent_op->update_flags) {
500 existing_ref->extent_op->flags_to_set |=
501 ref->extent_op->flags_to_set;
502 existing_ref->extent_op->update_flags = 1;
504 btrfs_free_delayed_extent_op(ref->extent_op);
508 * update the reference mod on the head to reflect this new operation,
509 * only need the lock for this case cause we could be processing it
510 * currently, for refs we just added we know we're a-ok.
512 old_ref_mod = existing_ref->total_ref_mod;
513 existing->ref_mod += update->ref_mod;
514 existing_ref->total_ref_mod += update->ref_mod;
517 * If we are going to from a positive ref mod to a negative or vice
518 * versa we need to make sure to adjust pending_csums accordingly.
520 if (existing_ref->is_data) {
521 if (existing_ref->total_ref_mod >= 0 && old_ref_mod < 0)
522 delayed_refs->pending_csums -= existing->num_bytes;
523 if (existing_ref->total_ref_mod < 0 && old_ref_mod >= 0)
524 delayed_refs->pending_csums += existing->num_bytes;
526 spin_unlock(&existing_ref->lock);
530 * helper function to actually insert a head node into the rbtree.
531 * this does all the dirty work in terms of maintaining the correct
532 * overall modification count.
534 static noinline struct btrfs_delayed_ref_head *
535 add_delayed_ref_head(struct btrfs_fs_info *fs_info,
536 struct btrfs_trans_handle *trans,
537 struct btrfs_delayed_ref_node *ref,
538 struct btrfs_qgroup_extent_record *qrecord,
539 u64 bytenr, u64 num_bytes, int action, int is_data)
541 struct btrfs_delayed_ref_head *existing;
542 struct btrfs_delayed_ref_head *head_ref = NULL;
543 struct btrfs_delayed_ref_root *delayed_refs;
544 struct btrfs_qgroup_extent_record *qexisting;
546 int must_insert_reserved = 0;
549 * the head node stores the sum of all the mods, so dropping a ref
550 * should drop the sum in the head node by one.
552 if (action == BTRFS_UPDATE_DELAYED_HEAD)
554 else if (action == BTRFS_DROP_DELAYED_REF)
558 * BTRFS_ADD_DELAYED_EXTENT means that we need to update
559 * the reserved accounting when the extent is finally added, or
560 * if a later modification deletes the delayed ref without ever
561 * inserting the extent into the extent allocation tree.
562 * ref->must_insert_reserved is the flag used to record
563 * that accounting mods are required.
565 * Once we record must_insert_reserved, switch the action to
566 * BTRFS_ADD_DELAYED_REF because other special casing is not required.
568 if (action == BTRFS_ADD_DELAYED_EXTENT)
569 must_insert_reserved = 1;
571 must_insert_reserved = 0;
573 delayed_refs = &trans->transaction->delayed_refs;
575 /* first set the basic ref node struct up */
576 atomic_set(&ref->refs, 1);
577 ref->bytenr = bytenr;
578 ref->num_bytes = num_bytes;
579 ref->ref_mod = count_mod;
586 head_ref = btrfs_delayed_node_to_head(ref);
587 head_ref->must_insert_reserved = must_insert_reserved;
588 head_ref->is_data = is_data;
589 INIT_LIST_HEAD(&head_ref->ref_list);
590 head_ref->processing = 0;
591 head_ref->total_ref_mod = count_mod;
592 head_ref->qgroup_reserved = 0;
593 head_ref->qgroup_ref_root = 0;
595 /* Record qgroup extent info if provided */
597 qrecord->bytenr = bytenr;
598 qrecord->num_bytes = num_bytes;
599 qrecord->old_roots = NULL;
601 qexisting = btrfs_qgroup_insert_dirty_extent(delayed_refs,
607 spin_lock_init(&head_ref->lock);
608 mutex_init(&head_ref->mutex);
610 trace_add_delayed_ref_head(ref, head_ref, action);
612 existing = htree_insert(&delayed_refs->href_root,
613 &head_ref->href_node);
615 update_existing_head_ref(delayed_refs, &existing->node, ref);
617 * we've updated the existing ref, free the newly
620 kmem_cache_free(btrfs_delayed_ref_head_cachep, head_ref);
623 if (is_data && count_mod < 0)
624 delayed_refs->pending_csums += num_bytes;
625 delayed_refs->num_heads++;
626 delayed_refs->num_heads_ready++;
627 atomic_inc(&delayed_refs->num_entries);
628 trans->delayed_ref_updates++;
634 * helper to insert a delayed tree ref into the rbtree.
637 add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
638 struct btrfs_trans_handle *trans,
639 struct btrfs_delayed_ref_head *head_ref,
640 struct btrfs_delayed_ref_node *ref, u64 bytenr,
641 u64 num_bytes, u64 parent, u64 ref_root, int level,
642 int action, int no_quota)
644 struct btrfs_delayed_tree_ref *full_ref;
645 struct btrfs_delayed_ref_root *delayed_refs;
649 if (action == BTRFS_ADD_DELAYED_EXTENT)
650 action = BTRFS_ADD_DELAYED_REF;
652 if (is_fstree(ref_root))
653 seq = atomic64_read(&fs_info->tree_mod_seq);
654 delayed_refs = &trans->transaction->delayed_refs;
656 /* first set the basic ref node struct up */
657 atomic_set(&ref->refs, 1);
658 ref->bytenr = bytenr;
659 ref->num_bytes = num_bytes;
661 ref->action = action;
664 ref->no_quota = no_quota;
667 full_ref = btrfs_delayed_node_to_tree_ref(ref);
668 full_ref->parent = parent;
669 full_ref->root = ref_root;
671 ref->type = BTRFS_SHARED_BLOCK_REF_KEY;
673 ref->type = BTRFS_TREE_BLOCK_REF_KEY;
674 full_ref->level = level;
676 trace_add_delayed_tree_ref(ref, full_ref, action);
678 ret = add_delayed_ref_tail_merge(trans, delayed_refs, head_ref, ref);
681 * XXX: memory should be freed at the same level allocated.
682 * But bad practice is anywhere... Follow it now. Need cleanup.
685 kmem_cache_free(btrfs_delayed_tree_ref_cachep, full_ref);
689 * helper to insert a delayed data ref into the rbtree.
692 add_delayed_data_ref(struct btrfs_fs_info *fs_info,
693 struct btrfs_trans_handle *trans,
694 struct btrfs_delayed_ref_head *head_ref,
695 struct btrfs_delayed_ref_node *ref, u64 bytenr,
696 u64 num_bytes, u64 parent, u64 ref_root, u64 owner,
697 u64 offset, int action, int no_quota)
699 struct btrfs_delayed_data_ref *full_ref;
700 struct btrfs_delayed_ref_root *delayed_refs;
704 if (action == BTRFS_ADD_DELAYED_EXTENT)
705 action = BTRFS_ADD_DELAYED_REF;
707 delayed_refs = &trans->transaction->delayed_refs;
709 if (is_fstree(ref_root))
710 seq = atomic64_read(&fs_info->tree_mod_seq);
712 /* first set the basic ref node struct up */
713 atomic_set(&ref->refs, 1);
714 ref->bytenr = bytenr;
715 ref->num_bytes = num_bytes;
717 ref->action = action;
720 ref->no_quota = no_quota;
723 full_ref = btrfs_delayed_node_to_data_ref(ref);
724 full_ref->parent = parent;
725 full_ref->root = ref_root;
727 ref->type = BTRFS_SHARED_DATA_REF_KEY;
729 ref->type = BTRFS_EXTENT_DATA_REF_KEY;
731 full_ref->objectid = owner;
732 full_ref->offset = offset;
734 trace_add_delayed_data_ref(ref, full_ref, action);
736 ret = add_delayed_ref_tail_merge(trans, delayed_refs, head_ref, ref);
739 kmem_cache_free(btrfs_delayed_data_ref_cachep, full_ref);
743 * add a delayed tree ref. This does all of the accounting required
744 * to make sure the delayed ref is eventually processed before this
745 * transaction commits.
747 int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
748 struct btrfs_trans_handle *trans,
749 u64 bytenr, u64 num_bytes, u64 parent,
750 u64 ref_root, int level, int action,
751 struct btrfs_delayed_extent_op *extent_op,
754 struct btrfs_delayed_tree_ref *ref;
755 struct btrfs_delayed_ref_head *head_ref;
756 struct btrfs_delayed_ref_root *delayed_refs;
757 struct btrfs_qgroup_extent_record *record = NULL;
759 if (!is_fstree(ref_root) || !fs_info->quota_enabled)
762 BUG_ON(extent_op && extent_op->is_data);
763 ref = kmem_cache_alloc(btrfs_delayed_tree_ref_cachep, GFP_NOFS);
767 head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
771 if (fs_info->quota_enabled && is_fstree(ref_root)) {
772 record = kmalloc(sizeof(*record), GFP_NOFS);
777 head_ref->extent_op = extent_op;
779 delayed_refs = &trans->transaction->delayed_refs;
780 spin_lock(&delayed_refs->lock);
783 * insert both the head node and the new ref without dropping
786 head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node, record,
787 bytenr, num_bytes, action, 0);
789 add_delayed_tree_ref(fs_info, trans, head_ref, &ref->node, bytenr,
790 num_bytes, parent, ref_root, level, action,
792 spin_unlock(&delayed_refs->lock);
797 kmem_cache_free(btrfs_delayed_ref_head_cachep, head_ref);
799 kmem_cache_free(btrfs_delayed_tree_ref_cachep, ref);
805 * add a delayed data ref. it's similar to btrfs_add_delayed_tree_ref.
807 int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
808 struct btrfs_trans_handle *trans,
809 u64 bytenr, u64 num_bytes,
810 u64 parent, u64 ref_root,
811 u64 owner, u64 offset, int action,
812 struct btrfs_delayed_extent_op *extent_op,
815 struct btrfs_delayed_data_ref *ref;
816 struct btrfs_delayed_ref_head *head_ref;
817 struct btrfs_delayed_ref_root *delayed_refs;
818 struct btrfs_qgroup_extent_record *record = NULL;
820 if (!is_fstree(ref_root) || !fs_info->quota_enabled)
823 BUG_ON(extent_op && !extent_op->is_data);
824 ref = kmem_cache_alloc(btrfs_delayed_data_ref_cachep, GFP_NOFS);
828 head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
830 kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
834 if (fs_info->quota_enabled && is_fstree(ref_root)) {
835 record = kmalloc(sizeof(*record), GFP_NOFS);
837 kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
838 kmem_cache_free(btrfs_delayed_ref_head_cachep,
844 head_ref->extent_op = extent_op;
846 delayed_refs = &trans->transaction->delayed_refs;
847 spin_lock(&delayed_refs->lock);
850 * insert both the head node and the new ref without dropping
853 head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node, record,
854 bytenr, num_bytes, action, 1);
856 add_delayed_data_ref(fs_info, trans, head_ref, &ref->node, bytenr,
857 num_bytes, parent, ref_root, owner, offset,
859 spin_unlock(&delayed_refs->lock);
864 int btrfs_add_delayed_qgroup_reserve(struct btrfs_fs_info *fs_info,
865 struct btrfs_trans_handle *trans,
866 u64 ref_root, u64 bytenr, u64 num_bytes)
868 struct btrfs_delayed_ref_root *delayed_refs;
869 struct btrfs_delayed_ref_head *ref_head;
872 if (!fs_info->quota_enabled || !is_fstree(ref_root))
875 delayed_refs = &trans->transaction->delayed_refs;
877 spin_lock(&delayed_refs->lock);
878 ref_head = find_ref_head(&delayed_refs->href_root, bytenr, 0);
883 WARN_ON(ref_head->qgroup_reserved || ref_head->qgroup_ref_root);
884 ref_head->qgroup_ref_root = ref_root;
885 ref_head->qgroup_reserved = num_bytes;
887 spin_unlock(&delayed_refs->lock);
891 int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
892 struct btrfs_trans_handle *trans,
893 u64 bytenr, u64 num_bytes,
894 struct btrfs_delayed_extent_op *extent_op)
896 struct btrfs_delayed_ref_head *head_ref;
897 struct btrfs_delayed_ref_root *delayed_refs;
899 head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
903 head_ref->extent_op = extent_op;
905 delayed_refs = &trans->transaction->delayed_refs;
906 spin_lock(&delayed_refs->lock);
908 add_delayed_ref_head(fs_info, trans, &head_ref->node, NULL, bytenr,
909 num_bytes, BTRFS_UPDATE_DELAYED_HEAD,
912 spin_unlock(&delayed_refs->lock);
917 * this does a simple search for the head node for a given extent.
918 * It must be called with the delayed ref spinlock held, and it returns
919 * the head node if any where found, or NULL if not.
921 struct btrfs_delayed_ref_head *
922 btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr)
924 struct btrfs_delayed_ref_root *delayed_refs;
926 delayed_refs = &trans->transaction->delayed_refs;
927 return find_ref_head(&delayed_refs->href_root, bytenr, 0);
930 void btrfs_delayed_ref_exit(void)
932 if (btrfs_delayed_ref_head_cachep)
933 kmem_cache_destroy(btrfs_delayed_ref_head_cachep);
934 if (btrfs_delayed_tree_ref_cachep)
935 kmem_cache_destroy(btrfs_delayed_tree_ref_cachep);
936 if (btrfs_delayed_data_ref_cachep)
937 kmem_cache_destroy(btrfs_delayed_data_ref_cachep);
938 if (btrfs_delayed_extent_op_cachep)
939 kmem_cache_destroy(btrfs_delayed_extent_op_cachep);
942 int btrfs_delayed_ref_init(void)
944 btrfs_delayed_ref_head_cachep = kmem_cache_create(
945 "btrfs_delayed_ref_head",
946 sizeof(struct btrfs_delayed_ref_head), 0,
947 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
948 if (!btrfs_delayed_ref_head_cachep)
951 btrfs_delayed_tree_ref_cachep = kmem_cache_create(
952 "btrfs_delayed_tree_ref",
953 sizeof(struct btrfs_delayed_tree_ref), 0,
954 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
955 if (!btrfs_delayed_tree_ref_cachep)
958 btrfs_delayed_data_ref_cachep = kmem_cache_create(
959 "btrfs_delayed_data_ref",
960 sizeof(struct btrfs_delayed_data_ref), 0,
961 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
962 if (!btrfs_delayed_data_ref_cachep)
965 btrfs_delayed_extent_op_cachep = kmem_cache_create(
966 "btrfs_delayed_extent_op",
967 sizeof(struct btrfs_delayed_extent_op), 0,
968 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
969 if (!btrfs_delayed_extent_op_cachep)
974 btrfs_delayed_ref_exit();