2 * Copyright (C) 2007 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.
20 #include <linux/sched.h>
21 #include <linux/writeback.h>
22 #include <linux/pagemap.h>
25 #include "transaction.h"
28 static int total_trans = 0;
29 extern struct kmem_cache *btrfs_trans_handle_cachep;
30 extern struct kmem_cache *btrfs_transaction_cachep;
32 static struct workqueue_struct *trans_wq;
34 #define BTRFS_ROOT_TRANS_TAG 0
35 #define BTRFS_ROOT_DEFRAG_TAG 1
37 static noinline void put_transaction(struct btrfs_transaction *transaction)
39 WARN_ON(transaction->use_count == 0);
40 transaction->use_count--;
41 if (transaction->use_count == 0) {
42 WARN_ON(total_trans == 0);
44 list_del_init(&transaction->list);
45 memset(transaction, 0, sizeof(*transaction));
46 kmem_cache_free(btrfs_transaction_cachep, transaction);
50 static noinline int join_transaction(struct btrfs_root *root)
52 struct btrfs_transaction *cur_trans;
53 cur_trans = root->fs_info->running_transaction;
55 cur_trans = kmem_cache_alloc(btrfs_transaction_cachep,
59 root->fs_info->generation++;
60 root->fs_info->last_alloc = 0;
61 root->fs_info->last_data_alloc = 0;
62 cur_trans->num_writers = 1;
63 cur_trans->num_joined = 0;
64 cur_trans->transid = root->fs_info->generation;
65 init_waitqueue_head(&cur_trans->writer_wait);
66 init_waitqueue_head(&cur_trans->commit_wait);
67 cur_trans->in_commit = 0;
68 cur_trans->use_count = 1;
69 cur_trans->commit_done = 0;
70 cur_trans->start_time = get_seconds();
71 INIT_LIST_HEAD(&cur_trans->pending_snapshots);
72 list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
73 btrfs_ordered_inode_tree_init(&cur_trans->ordered_inode_tree);
74 extent_io_tree_init(&cur_trans->dirty_pages,
75 root->fs_info->btree_inode->i_mapping,
77 spin_lock(&root->fs_info->new_trans_lock);
78 root->fs_info->running_transaction = cur_trans;
79 spin_unlock(&root->fs_info->new_trans_lock);
81 cur_trans->num_writers++;
82 cur_trans->num_joined++;
88 static noinline int record_root_in_trans(struct btrfs_root *root)
90 u64 running_trans_id = root->fs_info->running_transaction->transid;
91 if (root->ref_cows && root->last_trans < running_trans_id) {
92 WARN_ON(root == root->fs_info->extent_root);
93 if (root->root_item.refs != 0) {
94 radix_tree_tag_set(&root->fs_info->fs_roots_radix,
95 (unsigned long)root->root_key.objectid,
96 BTRFS_ROOT_TRANS_TAG);
97 radix_tree_tag_set(&root->fs_info->fs_roots_radix,
98 (unsigned long)root->root_key.objectid,
99 BTRFS_ROOT_DEFRAG_TAG);
100 root->commit_root = btrfs_root_node(root);
104 root->last_trans = running_trans_id;
109 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
112 struct btrfs_trans_handle *h =
113 kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
116 mutex_lock(&root->fs_info->trans_mutex);
117 ret = join_transaction(root);
120 record_root_in_trans(root);
121 h->transid = root->fs_info->running_transaction->transid;
122 h->transaction = root->fs_info->running_transaction;
123 h->blocks_reserved = num_blocks;
125 h->block_group = NULL;
126 h->alloc_exclude_nr = 0;
127 h->alloc_exclude_start = 0;
128 root->fs_info->running_transaction->use_count++;
129 mutex_unlock(&root->fs_info->trans_mutex);
133 static noinline int wait_for_commit(struct btrfs_root *root,
134 struct btrfs_transaction *commit)
137 mutex_lock(&root->fs_info->trans_mutex);
138 while(!commit->commit_done) {
139 prepare_to_wait(&commit->commit_wait, &wait,
140 TASK_UNINTERRUPTIBLE);
141 if (commit->commit_done)
143 mutex_unlock(&root->fs_info->trans_mutex);
145 mutex_lock(&root->fs_info->trans_mutex);
147 mutex_unlock(&root->fs_info->trans_mutex);
148 finish_wait(&commit->commit_wait, &wait);
152 static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
153 struct btrfs_root *root, int throttle)
155 struct btrfs_transaction *cur_trans;
157 mutex_lock(&root->fs_info->trans_mutex);
158 cur_trans = root->fs_info->running_transaction;
159 WARN_ON(cur_trans != trans->transaction);
160 WARN_ON(cur_trans->num_writers < 1);
161 cur_trans->num_writers--;
163 if (waitqueue_active(&cur_trans->writer_wait))
164 wake_up(&cur_trans->writer_wait);
166 if (cur_trans->in_commit && throttle) {
168 mutex_unlock(&root->fs_info->trans_mutex);
169 ret = wait_for_commit(root, cur_trans);
171 mutex_lock(&root->fs_info->trans_mutex);
174 put_transaction(cur_trans);
175 mutex_unlock(&root->fs_info->trans_mutex);
176 memset(trans, 0, sizeof(*trans));
177 kmem_cache_free(btrfs_trans_handle_cachep, trans);
181 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
182 struct btrfs_root *root)
184 return __btrfs_end_transaction(trans, root, 0);
187 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
188 struct btrfs_root *root)
190 return __btrfs_end_transaction(trans, root, 1);
194 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
195 struct btrfs_root *root)
200 struct extent_io_tree *dirty_pages;
202 struct inode *btree_inode = root->fs_info->btree_inode;
207 if (!trans || !trans->transaction) {
208 return filemap_write_and_wait(btree_inode->i_mapping);
210 dirty_pages = &trans->transaction->dirty_pages;
212 ret = find_first_extent_bit(dirty_pages, 0, &start, &end,
216 clear_extent_dirty(dirty_pages, start, end, GFP_NOFS);
217 while(start <= end) {
218 index = start >> PAGE_CACHE_SHIFT;
219 start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
220 page = find_lock_page(btree_inode->i_mapping, index);
223 if (PageWriteback(page)) {
225 wait_on_page_writeback(page);
228 page_cache_release(page);
232 err = write_one_page(page, 0);
235 page_cache_release(page);
238 err = filemap_fdatawait(btree_inode->i_mapping);
244 static int update_cowonly_root(struct btrfs_trans_handle *trans,
245 struct btrfs_root *root)
249 struct btrfs_root *tree_root = root->fs_info->tree_root;
251 btrfs_write_dirty_block_groups(trans, root);
253 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
254 if (old_root_bytenr == root->node->start)
256 btrfs_set_root_bytenr(&root->root_item,
258 btrfs_set_root_level(&root->root_item,
259 btrfs_header_level(root->node));
260 ret = btrfs_update_root(trans, tree_root,
264 btrfs_write_dirty_block_groups(trans, root);
269 int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
270 struct btrfs_root *root)
272 struct btrfs_fs_info *fs_info = root->fs_info;
273 struct list_head *next;
275 while(!list_empty(&fs_info->dirty_cowonly_roots)) {
276 next = fs_info->dirty_cowonly_roots.next;
278 root = list_entry(next, struct btrfs_root, dirty_list);
279 update_cowonly_root(trans, root);
285 struct list_head list;
286 struct btrfs_root *root;
287 struct btrfs_root *latest_root;
290 int btrfs_add_dead_root(struct btrfs_root *root,
291 struct btrfs_root *latest,
292 struct list_head *dead_list)
294 struct dirty_root *dirty;
296 dirty = kmalloc(sizeof(*dirty), GFP_NOFS);
300 dirty->latest_root = latest;
301 list_add(&dirty->list, dead_list);
305 static noinline int add_dirty_roots(struct btrfs_trans_handle *trans,
306 struct radix_tree_root *radix,
307 struct list_head *list)
309 struct dirty_root *dirty;
310 struct btrfs_root *gang[8];
311 struct btrfs_root *root;
318 ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0,
320 BTRFS_ROOT_TRANS_TAG);
323 for (i = 0; i < ret; i++) {
325 radix_tree_tag_clear(radix,
326 (unsigned long)root->root_key.objectid,
327 BTRFS_ROOT_TRANS_TAG);
328 if (root->commit_root == root->node) {
329 WARN_ON(root->node->start !=
330 btrfs_root_bytenr(&root->root_item));
331 free_extent_buffer(root->commit_root);
332 root->commit_root = NULL;
334 /* make sure to update the root on disk
335 * so we get any updates to the block used
338 err = btrfs_update_root(trans,
339 root->fs_info->tree_root,
344 dirty = kmalloc(sizeof(*dirty), GFP_NOFS);
346 dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS);
347 BUG_ON(!dirty->root);
349 memset(&root->root_item.drop_progress, 0,
350 sizeof(struct btrfs_disk_key));
351 root->root_item.drop_level = 0;
353 memcpy(dirty->root, root, sizeof(*root));
354 dirty->root->node = root->commit_root;
355 dirty->latest_root = root;
356 root->commit_root = NULL;
358 root->root_key.offset = root->fs_info->generation;
359 btrfs_set_root_bytenr(&root->root_item,
361 btrfs_set_root_level(&root->root_item,
362 btrfs_header_level(root->node));
363 err = btrfs_insert_root(trans, root->fs_info->tree_root,
369 refs = btrfs_root_refs(&dirty->root->root_item);
370 btrfs_set_root_refs(&dirty->root->root_item, refs - 1);
371 err = btrfs_update_root(trans, root->fs_info->tree_root,
372 &dirty->root->root_key,
373 &dirty->root->root_item);
377 list_add(&dirty->list, list);
388 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly)
390 struct btrfs_fs_info *info = root->fs_info;
392 struct btrfs_trans_handle *trans;
396 if (root->defrag_running)
398 trans = btrfs_start_transaction(root, 1);
400 root->defrag_running = 1;
401 ret = btrfs_defrag_leaves(trans, root, cacheonly);
402 nr = trans->blocks_used;
403 btrfs_end_transaction(trans, root);
404 btrfs_btree_balance_dirty(info->tree_root, nr);
407 trans = btrfs_start_transaction(root, 1);
411 root->defrag_running = 0;
413 radix_tree_tag_clear(&info->fs_roots_radix,
414 (unsigned long)root->root_key.objectid,
415 BTRFS_ROOT_DEFRAG_TAG);
416 btrfs_end_transaction(trans, root);
420 int btrfs_defrag_dirty_roots(struct btrfs_fs_info *info)
422 struct btrfs_root *gang[1];
423 struct btrfs_root *root;
430 ret = radix_tree_gang_lookup_tag(&info->fs_roots_radix,
433 BTRFS_ROOT_DEFRAG_TAG);
436 for (i = 0; i < ret; i++) {
438 last = root->root_key.objectid + 1;
439 btrfs_defrag_root(root, 1);
442 btrfs_defrag_root(info->extent_root, 1);
446 static noinline int drop_dirty_roots(struct btrfs_root *tree_root,
447 struct list_head *list)
449 struct dirty_root *dirty;
450 struct btrfs_trans_handle *trans;
457 while(!list_empty(list)) {
458 struct btrfs_root *root;
460 dirty = list_entry(list->next, struct dirty_root, list);
461 list_del_init(&dirty->list);
463 num_bytes = btrfs_root_used(&dirty->root->root_item);
464 root = dirty->latest_root;
465 atomic_inc(&root->fs_info->throttles);
467 mutex_lock(&root->fs_info->drop_mutex);
469 trans = btrfs_start_transaction(tree_root, 1);
470 ret = btrfs_drop_snapshot(trans, dirty->root);
471 if (ret != -EAGAIN) {
475 err = btrfs_update_root(trans,
477 &dirty->root->root_key,
478 &dirty->root->root_item);
481 nr = trans->blocks_used;
482 ret = btrfs_end_transaction(trans, tree_root);
485 mutex_unlock(&root->fs_info->drop_mutex);
486 btrfs_btree_balance_dirty(tree_root, nr);
488 mutex_lock(&root->fs_info->drop_mutex);
491 atomic_dec(&root->fs_info->throttles);
493 mutex_lock(&root->fs_info->alloc_mutex);
494 num_bytes -= btrfs_root_used(&dirty->root->root_item);
495 bytes_used = btrfs_root_used(&root->root_item);
497 record_root_in_trans(root);
498 btrfs_set_root_used(&root->root_item,
499 bytes_used - num_bytes);
501 mutex_unlock(&root->fs_info->alloc_mutex);
503 ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key);
508 mutex_unlock(&root->fs_info->drop_mutex);
510 nr = trans->blocks_used;
511 ret = btrfs_end_transaction(trans, tree_root);
514 free_extent_buffer(dirty->root->node);
518 btrfs_btree_balance_dirty(tree_root, nr);
524 int btrfs_write_ordered_inodes(struct btrfs_trans_handle *trans,
525 struct btrfs_root *root)
527 struct btrfs_transaction *cur_trans = trans->transaction;
529 u64 root_objectid = 0;
533 atomic_inc(&root->fs_info->throttles);
535 ret = btrfs_find_first_ordered_inode(
536 &cur_trans->ordered_inode_tree,
537 &root_objectid, &objectid, &inode);
541 mutex_unlock(&root->fs_info->trans_mutex);
543 if (S_ISREG(inode->i_mode)) {
544 atomic_inc(&BTRFS_I(inode)->ordered_writeback);
545 filemap_fdatawrite(inode->i_mapping);
546 atomic_dec(&BTRFS_I(inode)->ordered_writeback);
550 mutex_lock(&root->fs_info->trans_mutex);
555 ret = btrfs_find_del_first_ordered_inode(
556 &cur_trans->ordered_inode_tree,
557 &root_objectid, &objectid, &inode);
560 mutex_unlock(&root->fs_info->trans_mutex);
562 if (S_ISREG(inode->i_mode)) {
563 atomic_inc(&BTRFS_I(inode)->ordered_writeback);
564 filemap_write_and_wait(inode->i_mapping);
565 atomic_dec(&BTRFS_I(inode)->ordered_writeback);
567 atomic_dec(&inode->i_count);
570 mutex_lock(&root->fs_info->trans_mutex);
572 atomic_dec(&root->fs_info->throttles);
576 static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
577 struct btrfs_fs_info *fs_info,
578 struct btrfs_pending_snapshot *pending)
580 struct btrfs_key key;
581 struct btrfs_root_item *new_root_item;
582 struct btrfs_root *tree_root = fs_info->tree_root;
583 struct btrfs_root *root = pending->root;
584 struct extent_buffer *tmp;
585 struct extent_buffer *old;
590 new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS);
591 if (!new_root_item) {
595 ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid);
599 memcpy(new_root_item, &root->root_item, sizeof(*new_root_item));
601 key.objectid = objectid;
603 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
605 old = btrfs_lock_root_node(root);
606 btrfs_cow_block(trans, root, old, NULL, 0, &old);
608 btrfs_copy_root(trans, root, old, &tmp, objectid);
609 btrfs_tree_unlock(old);
610 free_extent_buffer(old);
612 btrfs_set_root_bytenr(new_root_item, tmp->start);
613 btrfs_set_root_level(new_root_item, btrfs_header_level(tmp));
614 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
616 btrfs_tree_unlock(tmp);
617 free_extent_buffer(tmp);
622 * insert the directory item
624 key.offset = (u64)-1;
625 namelen = strlen(pending->name);
626 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
627 pending->name, namelen,
628 root->fs_info->sb->s_root->d_inode->i_ino,
634 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
635 pending->name, strlen(pending->name), objectid,
636 root->fs_info->sb->s_root->d_inode->i_ino);
638 /* Invalidate existing dcache entry for new snapshot. */
639 btrfs_invalidate_dcache_root(root, pending->name, namelen);
642 kfree(new_root_item);
646 static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans,
647 struct btrfs_fs_info *fs_info)
649 struct btrfs_pending_snapshot *pending;
650 struct list_head *head = &trans->transaction->pending_snapshots;
653 while(!list_empty(head)) {
654 pending = list_entry(head->next,
655 struct btrfs_pending_snapshot, list);
656 ret = create_pending_snapshot(trans, fs_info, pending);
658 list_del(&pending->list);
659 kfree(pending->name);
665 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
666 struct btrfs_root *root)
668 unsigned long joined = 0;
669 unsigned long timeout = 1;
670 struct btrfs_transaction *cur_trans;
671 struct btrfs_transaction *prev_trans = NULL;
672 struct btrfs_root *chunk_root = root->fs_info->chunk_root;
673 struct list_head dirty_fs_roots;
674 struct extent_io_tree *pinned_copy;
678 INIT_LIST_HEAD(&dirty_fs_roots);
680 mutex_lock(&root->fs_info->trans_mutex);
681 if (trans->transaction->in_commit) {
682 cur_trans = trans->transaction;
683 trans->transaction->use_count++;
684 mutex_unlock(&root->fs_info->trans_mutex);
685 btrfs_end_transaction(trans, root);
687 ret = wait_for_commit(root, cur_trans);
690 mutex_lock(&root->fs_info->trans_mutex);
691 put_transaction(cur_trans);
692 mutex_unlock(&root->fs_info->trans_mutex);
697 pinned_copy = kmalloc(sizeof(*pinned_copy), GFP_NOFS);
701 extent_io_tree_init(pinned_copy,
702 root->fs_info->btree_inode->i_mapping, GFP_NOFS);
704 trans->transaction->in_commit = 1;
705 printk("trans %Lu in commit\n", trans->transid);
706 cur_trans = trans->transaction;
707 if (cur_trans->list.prev != &root->fs_info->trans_list) {
708 prev_trans = list_entry(cur_trans->list.prev,
709 struct btrfs_transaction, list);
710 if (!prev_trans->commit_done) {
711 prev_trans->use_count++;
712 mutex_unlock(&root->fs_info->trans_mutex);
714 wait_for_commit(root, prev_trans);
716 mutex_lock(&root->fs_info->trans_mutex);
717 put_transaction(prev_trans);
722 joined = cur_trans->num_joined;
723 WARN_ON(cur_trans != trans->transaction);
724 prepare_to_wait(&cur_trans->writer_wait, &wait,
725 TASK_UNINTERRUPTIBLE);
727 if (cur_trans->num_writers > 1)
728 timeout = MAX_SCHEDULE_TIMEOUT;
732 mutex_unlock(&root->fs_info->trans_mutex);
734 schedule_timeout(timeout);
736 mutex_lock(&root->fs_info->trans_mutex);
737 finish_wait(&cur_trans->writer_wait, &wait);
738 ret = btrfs_write_ordered_inodes(trans, root);
740 } while (cur_trans->num_writers > 1 ||
741 (cur_trans->num_joined != joined));
743 ret = create_pending_snapshots(trans, root->fs_info);
746 WARN_ON(cur_trans != trans->transaction);
748 ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix,
752 ret = btrfs_commit_tree_roots(trans, root);
755 cur_trans = root->fs_info->running_transaction;
756 spin_lock(&root->fs_info->new_trans_lock);
757 root->fs_info->running_transaction = NULL;
758 spin_unlock(&root->fs_info->new_trans_lock);
759 btrfs_set_super_generation(&root->fs_info->super_copy,
761 btrfs_set_super_root(&root->fs_info->super_copy,
762 root->fs_info->tree_root->node->start);
763 btrfs_set_super_root_level(&root->fs_info->super_copy,
764 btrfs_header_level(root->fs_info->tree_root->node));
766 btrfs_set_super_chunk_root(&root->fs_info->super_copy,
767 chunk_root->node->start);
768 btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
769 btrfs_header_level(chunk_root->node));
770 memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy,
771 sizeof(root->fs_info->super_copy));
773 btrfs_copy_pinned(root, pinned_copy);
775 mutex_unlock(&root->fs_info->trans_mutex);
776 ret = btrfs_write_and_wait_transaction(trans, root);
778 write_ctree_super(trans, root);
780 btrfs_finish_extent_commit(trans, root, pinned_copy);
781 mutex_lock(&root->fs_info->trans_mutex);
785 cur_trans->commit_done = 1;
786 printk("trans %Lu done in commit\n", cur_trans->transid);
787 root->fs_info->last_trans_committed = cur_trans->transid;
788 wake_up(&cur_trans->commit_wait);
789 put_transaction(cur_trans);
790 put_transaction(cur_trans);
792 if (root->fs_info->closing)
793 list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots);
795 list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots);
797 mutex_unlock(&root->fs_info->trans_mutex);
798 kmem_cache_free(btrfs_trans_handle_cachep, trans);
800 if (root->fs_info->closing) {
801 drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots);
806 int btrfs_clean_old_snapshots(struct btrfs_root *root)
808 struct list_head dirty_roots;
809 INIT_LIST_HEAD(&dirty_roots);
811 mutex_lock(&root->fs_info->trans_mutex);
812 list_splice_init(&root->fs_info->dead_roots, &dirty_roots);
813 mutex_unlock(&root->fs_info->trans_mutex);
815 if (!list_empty(&dirty_roots)) {
816 drop_dirty_roots(root, &dirty_roots);
820 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
821 void btrfs_transaction_cleaner(void *p)
823 void btrfs_transaction_cleaner(struct work_struct *work)
826 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
827 struct btrfs_fs_info *fs_info = p;
829 struct btrfs_fs_info *fs_info = container_of(work,
830 struct btrfs_fs_info,
834 struct btrfs_root *root = fs_info->tree_root;
835 struct btrfs_transaction *cur;
836 struct btrfs_trans_handle *trans;
838 unsigned long delay = HZ * 30;
842 if (root->fs_info->closing)
845 mutex_lock(&root->fs_info->trans_mutex);
846 cur = root->fs_info->running_transaction;
848 mutex_unlock(&root->fs_info->trans_mutex);
852 if (now < cur->start_time || now - cur->start_time < 30) {
853 mutex_unlock(&root->fs_info->trans_mutex);
857 mutex_unlock(&root->fs_info->trans_mutex);
858 btrfs_defrag_dirty_roots(root->fs_info);
859 trans = btrfs_start_transaction(root, 1);
860 ret = btrfs_commit_transaction(trans, root);
862 btrfs_clean_old_snapshots(root);
863 btrfs_transaction_queue_work(root, delay);
866 void btrfs_transaction_queue_work(struct btrfs_root *root, int delay)
868 if (!root->fs_info->closing)
869 queue_delayed_work(trans_wq, &root->fs_info->trans_work, delay);
872 void btrfs_transaction_flush_work(struct btrfs_root *root)
874 cancel_delayed_work(&root->fs_info->trans_work);
875 flush_workqueue(trans_wq);
878 void __init btrfs_init_transaction_sys(void)
880 trans_wq = create_workqueue("btrfs-transaction");
883 void btrfs_exit_transaction_sys(void)
885 destroy_workqueue(trans_wq);