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.
18 #include <linux/sched.h>
19 #include <linux/pagemap.h>
20 #include <linux/writeback.h>
21 #include <linux/blkdev.h>
22 #include <linux/sort.h>
28 #include "print-tree.h"
29 #include "transaction.h"
32 #include "ref-cache.h"
34 #define PENDING_EXTENT_INSERT 0
35 #define PENDING_EXTENT_DELETE 1
36 #define PENDING_BACKREF_UPDATE 2
38 struct pending_extent_op {
47 struct list_head list;
51 static int finish_current_insert(struct btrfs_trans_handle *trans,
52 struct btrfs_root *extent_root, int all);
53 static int del_pending_extents(struct btrfs_trans_handle *trans,
54 struct btrfs_root *extent_root, int all);
55 static int pin_down_bytes(struct btrfs_trans_handle *trans,
56 struct btrfs_root *root,
57 u64 bytenr, u64 num_bytes, int is_data);
58 static int update_block_group(struct btrfs_trans_handle *trans,
59 struct btrfs_root *root,
60 u64 bytenr, u64 num_bytes, int alloc,
63 static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
65 return (cache->flags & bits) == bits;
69 * this adds the block group to the fs_info rb tree for the block group
72 static int btrfs_add_block_group_cache(struct btrfs_fs_info *info,
73 struct btrfs_block_group_cache *block_group)
76 struct rb_node *parent = NULL;
77 struct btrfs_block_group_cache *cache;
79 spin_lock(&info->block_group_cache_lock);
80 p = &info->block_group_cache_tree.rb_node;
84 cache = rb_entry(parent, struct btrfs_block_group_cache,
86 if (block_group->key.objectid < cache->key.objectid) {
88 } else if (block_group->key.objectid > cache->key.objectid) {
91 spin_unlock(&info->block_group_cache_lock);
96 rb_link_node(&block_group->cache_node, parent, p);
97 rb_insert_color(&block_group->cache_node,
98 &info->block_group_cache_tree);
99 spin_unlock(&info->block_group_cache_lock);
105 * This will return the block group at or after bytenr if contains is 0, else
106 * it will return the block group that contains the bytenr
108 static struct btrfs_block_group_cache *
109 block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr,
112 struct btrfs_block_group_cache *cache, *ret = NULL;
116 spin_lock(&info->block_group_cache_lock);
117 n = info->block_group_cache_tree.rb_node;
120 cache = rb_entry(n, struct btrfs_block_group_cache,
122 end = cache->key.objectid + cache->key.offset - 1;
123 start = cache->key.objectid;
125 if (bytenr < start) {
126 if (!contains && (!ret || start < ret->key.objectid))
129 } else if (bytenr > start) {
130 if (contains && bytenr <= end) {
141 atomic_inc(&ret->count);
142 spin_unlock(&info->block_group_cache_lock);
148 * this is only called by cache_block_group, since we could have freed extents
149 * we need to check the pinned_extents for any extents that can't be used yet
150 * since their free space will be released as soon as the transaction commits.
152 static int add_new_free_space(struct btrfs_block_group_cache *block_group,
153 struct btrfs_fs_info *info, u64 start, u64 end)
155 u64 extent_start, extent_end, size;
158 mutex_lock(&info->pinned_mutex);
159 while (start < end) {
160 ret = find_first_extent_bit(&info->pinned_extents, start,
161 &extent_start, &extent_end,
166 if (extent_start == start) {
167 start = extent_end + 1;
168 } else if (extent_start > start && extent_start < end) {
169 size = extent_start - start;
170 ret = btrfs_add_free_space(block_group, start,
173 start = extent_end + 1;
181 ret = btrfs_add_free_space(block_group, start, size);
184 mutex_unlock(&info->pinned_mutex);
189 static int remove_sb_from_cache(struct btrfs_root *root,
190 struct btrfs_block_group_cache *cache)
197 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
198 bytenr = btrfs_sb_offset(i);
199 ret = btrfs_rmap_block(&root->fs_info->mapping_tree,
200 cache->key.objectid, bytenr, 0,
201 &logical, &nr, &stripe_len);
204 btrfs_remove_free_space(cache, logical[nr],
212 static int cache_block_group(struct btrfs_root *root,
213 struct btrfs_block_group_cache *block_group)
215 struct btrfs_path *path;
217 struct btrfs_key key;
218 struct extent_buffer *leaf;
225 root = root->fs_info->extent_root;
227 if (block_group->cached)
230 path = btrfs_alloc_path();
236 * we get into deadlocks with paths held by callers of this function.
237 * since the alloc_mutex is protecting things right now, just
238 * skip the locking here
240 path->skip_locking = 1;
241 last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET);
244 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
245 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
250 leaf = path->nodes[0];
251 slot = path->slots[0];
252 if (slot >= btrfs_header_nritems(leaf)) {
253 ret = btrfs_next_leaf(root, path);
261 btrfs_item_key_to_cpu(leaf, &key, slot);
262 if (key.objectid < block_group->key.objectid)
265 if (key.objectid >= block_group->key.objectid +
266 block_group->key.offset)
269 if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) {
270 add_new_free_space(block_group, root->fs_info, last,
273 last = key.objectid + key.offset;
279 add_new_free_space(block_group, root->fs_info, last,
280 block_group->key.objectid +
281 block_group->key.offset);
283 remove_sb_from_cache(root, block_group);
284 block_group->cached = 1;
287 btrfs_free_path(path);
292 * return the block group that starts at or after bytenr
294 static struct btrfs_block_group_cache *
295 btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr)
297 struct btrfs_block_group_cache *cache;
299 cache = block_group_cache_tree_search(info, bytenr, 0);
305 * return the block group that contains teh given bytenr
307 struct btrfs_block_group_cache *btrfs_lookup_block_group(
308 struct btrfs_fs_info *info,
311 struct btrfs_block_group_cache *cache;
313 cache = block_group_cache_tree_search(info, bytenr, 1);
318 static inline void put_block_group(struct btrfs_block_group_cache *cache)
320 if (atomic_dec_and_test(&cache->count))
324 static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
327 struct list_head *head = &info->space_info;
328 struct btrfs_space_info *found;
329 list_for_each_entry(found, head, list) {
330 if (found->flags == flags)
336 static u64 div_factor(u64 num, int factor)
345 u64 btrfs_find_block_group(struct btrfs_root *root,
346 u64 search_start, u64 search_hint, int owner)
348 struct btrfs_block_group_cache *cache;
350 u64 last = max(search_hint, search_start);
357 cache = btrfs_lookup_first_block_group(root->fs_info, last);
361 spin_lock(&cache->lock);
362 last = cache->key.objectid + cache->key.offset;
363 used = btrfs_block_group_used(&cache->item);
365 if ((full_search || !cache->ro) &&
366 block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) {
367 if (used + cache->pinned + cache->reserved <
368 div_factor(cache->key.offset, factor)) {
369 group_start = cache->key.objectid;
370 spin_unlock(&cache->lock);
371 put_block_group(cache);
375 spin_unlock(&cache->lock);
376 put_block_group(cache);
384 if (!full_search && factor < 10) {
394 /* simple helper to search for an existing extent at a given offset */
395 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len)
398 struct btrfs_key key;
399 struct btrfs_path *path;
401 path = btrfs_alloc_path();
403 key.objectid = start;
405 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
406 ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path,
408 btrfs_free_path(path);
413 * Back reference rules. Back refs have three main goals:
415 * 1) differentiate between all holders of references to an extent so that
416 * when a reference is dropped we can make sure it was a valid reference
417 * before freeing the extent.
419 * 2) Provide enough information to quickly find the holders of an extent
420 * if we notice a given block is corrupted or bad.
422 * 3) Make it easy to migrate blocks for FS shrinking or storage pool
423 * maintenance. This is actually the same as #2, but with a slightly
424 * different use case.
426 * File extents can be referenced by:
428 * - multiple snapshots, subvolumes, or different generations in one subvol
429 * - different files inside a single subvolume
430 * - different offsets inside a file (bookend extents in file.c)
432 * The extent ref structure has fields for:
434 * - Objectid of the subvolume root
435 * - Generation number of the tree holding the reference
436 * - objectid of the file holding the reference
437 * - number of references holding by parent node (alway 1 for tree blocks)
439 * Btree leaf may hold multiple references to a file extent. In most cases,
440 * these references are from same file and the corresponding offsets inside
441 * the file are close together.
443 * When a file extent is allocated the fields are filled in:
444 * (root_key.objectid, trans->transid, inode objectid, 1)
446 * When a leaf is cow'd new references are added for every file extent found
447 * in the leaf. It looks similar to the create case, but trans->transid will
448 * be different when the block is cow'd.
450 * (root_key.objectid, trans->transid, inode objectid,
451 * number of references in the leaf)
453 * When a file extent is removed either during snapshot deletion or
454 * file truncation, we find the corresponding back reference and check
455 * the following fields:
457 * (btrfs_header_owner(leaf), btrfs_header_generation(leaf),
460 * Btree extents can be referenced by:
462 * - Different subvolumes
463 * - Different generations of the same subvolume
465 * When a tree block is created, back references are inserted:
467 * (root->root_key.objectid, trans->transid, level, 1)
469 * When a tree block is cow'd, new back references are added for all the
470 * blocks it points to. If the tree block isn't in reference counted root,
471 * the old back references are removed. These new back references are of
472 * the form (trans->transid will have increased since creation):
474 * (root->root_key.objectid, trans->transid, level, 1)
476 * When a backref is in deleting, the following fields are checked:
478 * if backref was for a tree root:
479 * (btrfs_header_owner(itself), btrfs_header_generation(itself), level)
481 * (btrfs_header_owner(parent), btrfs_header_generation(parent), level)
483 * Back Reference Key composing:
485 * The key objectid corresponds to the first byte in the extent, the key
486 * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first
487 * byte of parent extent. If a extent is tree root, the key offset is set
488 * to the key objectid.
491 static noinline int lookup_extent_backref(struct btrfs_trans_handle *trans,
492 struct btrfs_root *root,
493 struct btrfs_path *path,
494 u64 bytenr, u64 parent,
495 u64 ref_root, u64 ref_generation,
496 u64 owner_objectid, int del)
498 struct btrfs_key key;
499 struct btrfs_extent_ref *ref;
500 struct extent_buffer *leaf;
504 key.objectid = bytenr;
505 key.type = BTRFS_EXTENT_REF_KEY;
508 ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1);
516 leaf = path->nodes[0];
517 ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
518 ref_objectid = btrfs_ref_objectid(leaf, ref);
519 if (btrfs_ref_root(leaf, ref) != ref_root ||
520 btrfs_ref_generation(leaf, ref) != ref_generation ||
521 (ref_objectid != owner_objectid &&
522 ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) {
533 * updates all the backrefs that are pending on update_list for the
536 static noinline int update_backrefs(struct btrfs_trans_handle *trans,
537 struct btrfs_root *extent_root,
538 struct btrfs_path *path,
539 struct list_head *update_list)
541 struct btrfs_key key;
542 struct btrfs_extent_ref *ref;
543 struct btrfs_fs_info *info = extent_root->fs_info;
544 struct pending_extent_op *op;
545 struct extent_buffer *leaf;
547 struct list_head *cur = update_list->next;
549 u64 ref_root = extent_root->root_key.objectid;
551 op = list_entry(cur, struct pending_extent_op, list);
554 key.objectid = op->bytenr;
555 key.type = BTRFS_EXTENT_REF_KEY;
556 key.offset = op->orig_parent;
558 ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 1);
561 leaf = path->nodes[0];
564 ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
566 ref_objectid = btrfs_ref_objectid(leaf, ref);
568 if (btrfs_ref_root(leaf, ref) != ref_root ||
569 btrfs_ref_generation(leaf, ref) != op->orig_generation ||
570 (ref_objectid != op->level &&
571 ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) {
572 printk(KERN_ERR "btrfs couldn't find %llu, parent %llu, "
573 "root %llu, owner %u\n",
574 (unsigned long long)op->bytenr,
575 (unsigned long long)op->orig_parent,
576 (unsigned long long)ref_root, op->level);
577 btrfs_print_leaf(extent_root, leaf);
581 key.objectid = op->bytenr;
582 key.offset = op->parent;
583 key.type = BTRFS_EXTENT_REF_KEY;
584 ret = btrfs_set_item_key_safe(trans, extent_root, path, &key);
586 ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
587 btrfs_set_ref_generation(leaf, ref, op->generation);
591 list_del_init(&op->list);
592 unlock_extent(&info->extent_ins, op->bytenr,
593 op->bytenr + op->num_bytes - 1, GFP_NOFS);
596 if (cur == update_list) {
597 btrfs_mark_buffer_dirty(path->nodes[0]);
598 btrfs_release_path(extent_root, path);
602 op = list_entry(cur, struct pending_extent_op, list);
605 while (path->slots[0] < btrfs_header_nritems(leaf)) {
606 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
607 if (key.objectid == op->bytenr &&
608 key.type == BTRFS_EXTENT_REF_KEY)
613 btrfs_mark_buffer_dirty(path->nodes[0]);
614 btrfs_release_path(extent_root, path);
621 static noinline int insert_extents(struct btrfs_trans_handle *trans,
622 struct btrfs_root *extent_root,
623 struct btrfs_path *path,
624 struct list_head *insert_list, int nr)
626 struct btrfs_key *keys;
628 struct pending_extent_op *op;
629 struct extent_buffer *leaf;
630 struct list_head *cur = insert_list->next;
631 struct btrfs_fs_info *info = extent_root->fs_info;
632 u64 ref_root = extent_root->root_key.objectid;
633 int i = 0, last = 0, ret;
639 keys = kzalloc(total * sizeof(struct btrfs_key), GFP_NOFS);
643 data_size = kzalloc(total * sizeof(u32), GFP_NOFS);
649 list_for_each_entry(op, insert_list, list) {
650 keys[i].objectid = op->bytenr;
651 keys[i].offset = op->num_bytes;
652 keys[i].type = BTRFS_EXTENT_ITEM_KEY;
653 data_size[i] = sizeof(struct btrfs_extent_item);
656 keys[i].objectid = op->bytenr;
657 keys[i].offset = op->parent;
658 keys[i].type = BTRFS_EXTENT_REF_KEY;
659 data_size[i] = sizeof(struct btrfs_extent_ref);
663 op = list_entry(cur, struct pending_extent_op, list);
667 ret = btrfs_insert_some_items(trans, extent_root, path,
668 keys+i, data_size+i, total-i);
674 leaf = path->nodes[0];
675 for (c = 0; c < ret; c++) {
676 int ref_first = keys[i].type == BTRFS_EXTENT_REF_KEY;
679 * if the first item we inserted was a backref, then
680 * the EXTENT_ITEM will be the odd c's, else it will
683 if ((ref_first && (c % 2)) ||
684 (!ref_first && !(c % 2))) {
685 struct btrfs_extent_item *itm;
687 itm = btrfs_item_ptr(leaf, path->slots[0] + c,
688 struct btrfs_extent_item);
689 btrfs_set_extent_refs(path->nodes[0], itm, 1);
692 struct btrfs_extent_ref *ref;
694 ref = btrfs_item_ptr(leaf, path->slots[0] + c,
695 struct btrfs_extent_ref);
696 btrfs_set_ref_root(leaf, ref, ref_root);
697 btrfs_set_ref_generation(leaf, ref,
699 btrfs_set_ref_objectid(leaf, ref, op->level);
700 btrfs_set_ref_num_refs(leaf, ref, 1);
705 * using del to see when its ok to free up the
706 * pending_extent_op. In the case where we insert the
707 * last item on the list in order to help do batching
708 * we need to not free the extent op until we actually
709 * insert the extent_item
712 unlock_extent(&info->extent_ins, op->bytenr,
713 op->bytenr + op->num_bytes - 1,
716 list_del_init(&op->list);
718 if (cur != insert_list)
720 struct pending_extent_op,
724 btrfs_mark_buffer_dirty(leaf);
725 btrfs_release_path(extent_root, path);
728 * Ok backref's and items usually go right next to eachother,
729 * but if we could only insert 1 item that means that we
730 * inserted on the end of a leaf, and we have no idea what may
731 * be on the next leaf so we just play it safe. In order to
732 * try and help this case we insert the last thing on our
733 * insert list so hopefully it will end up being the last
734 * thing on the leaf and everything else will be before it,
735 * which will let us insert a whole bunch of items at the same
738 if (ret == 1 && !last && (i + ret < total)) {
740 * last: where we will pick up the next time around
741 * i: our current key to insert, will be total - 1
742 * cur: the current op we are screwing with
747 cur = insert_list->prev;
748 op = list_entry(cur, struct pending_extent_op, list);
751 * ok we successfully inserted the last item on the
752 * list, lets reset everything
754 * i: our current key to insert, so where we left off
756 * last: done with this
757 * cur: the op we are messing with
759 * total: since we inserted the last key, we need to
760 * decrement total so we dont overflow
766 cur = insert_list->next;
767 op = list_entry(cur, struct pending_extent_op,
782 static noinline int insert_extent_backref(struct btrfs_trans_handle *trans,
783 struct btrfs_root *root,
784 struct btrfs_path *path,
785 u64 bytenr, u64 parent,
786 u64 ref_root, u64 ref_generation,
789 struct btrfs_key key;
790 struct extent_buffer *leaf;
791 struct btrfs_extent_ref *ref;
795 key.objectid = bytenr;
796 key.type = BTRFS_EXTENT_REF_KEY;
799 ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref));
801 leaf = path->nodes[0];
802 ref = btrfs_item_ptr(leaf, path->slots[0],
803 struct btrfs_extent_ref);
804 btrfs_set_ref_root(leaf, ref, ref_root);
805 btrfs_set_ref_generation(leaf, ref, ref_generation);
806 btrfs_set_ref_objectid(leaf, ref, owner_objectid);
807 btrfs_set_ref_num_refs(leaf, ref, 1);
808 } else if (ret == -EEXIST) {
810 BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID);
811 leaf = path->nodes[0];
812 ref = btrfs_item_ptr(leaf, path->slots[0],
813 struct btrfs_extent_ref);
814 if (btrfs_ref_root(leaf, ref) != ref_root ||
815 btrfs_ref_generation(leaf, ref) != ref_generation) {
821 num_refs = btrfs_ref_num_refs(leaf, ref);
822 BUG_ON(num_refs == 0);
823 btrfs_set_ref_num_refs(leaf, ref, num_refs + 1);
825 existing_owner = btrfs_ref_objectid(leaf, ref);
826 if (existing_owner != owner_objectid &&
827 existing_owner != BTRFS_MULTIPLE_OBJECTIDS) {
828 btrfs_set_ref_objectid(leaf, ref,
829 BTRFS_MULTIPLE_OBJECTIDS);
835 btrfs_mark_buffer_dirty(path->nodes[0]);
837 btrfs_release_path(root, path);
841 static noinline int remove_extent_backref(struct btrfs_trans_handle *trans,
842 struct btrfs_root *root,
843 struct btrfs_path *path)
845 struct extent_buffer *leaf;
846 struct btrfs_extent_ref *ref;
850 leaf = path->nodes[0];
851 ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref);
852 num_refs = btrfs_ref_num_refs(leaf, ref);
853 BUG_ON(num_refs == 0);
856 ret = btrfs_del_item(trans, root, path);
858 btrfs_set_ref_num_refs(leaf, ref, num_refs);
859 btrfs_mark_buffer_dirty(leaf);
861 btrfs_release_path(root, path);
865 #ifdef BIO_RW_DISCARD
866 static void btrfs_issue_discard(struct block_device *bdev,
869 blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
873 static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
876 #ifdef BIO_RW_DISCARD
878 u64 map_length = num_bytes;
879 struct btrfs_multi_bio *multi = NULL;
881 /* Tell the block device(s) that the sectors can be discarded */
882 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
883 bytenr, &map_length, &multi, 0);
885 struct btrfs_bio_stripe *stripe = multi->stripes;
888 if (map_length > num_bytes)
889 map_length = num_bytes;
891 for (i = 0; i < multi->num_stripes; i++, stripe++) {
892 btrfs_issue_discard(stripe->dev->bdev,
905 static noinline int free_extents(struct btrfs_trans_handle *trans,
906 struct btrfs_root *extent_root,
907 struct list_head *del_list)
909 struct btrfs_fs_info *info = extent_root->fs_info;
910 struct btrfs_path *path;
911 struct btrfs_key key, found_key;
912 struct extent_buffer *leaf;
913 struct list_head *cur;
914 struct pending_extent_op *op;
915 struct btrfs_extent_item *ei;
916 int ret, num_to_del, extent_slot = 0, found_extent = 0;
920 path = btrfs_alloc_path();
926 /* search for the backref for the current ref we want to delete */
927 cur = del_list->next;
928 op = list_entry(cur, struct pending_extent_op, list);
929 ret = lookup_extent_backref(trans, extent_root, path, op->bytenr,
931 extent_root->root_key.objectid,
932 op->orig_generation, op->level, 1);
934 printk(KERN_ERR "btrfs unable to find backref byte nr %llu "
935 "root %llu gen %llu owner %u\n",
936 (unsigned long long)op->bytenr,
937 (unsigned long long)extent_root->root_key.objectid,
938 (unsigned long long)op->orig_generation, op->level);
939 btrfs_print_leaf(extent_root, path->nodes[0]);
944 extent_slot = path->slots[0];
949 * if we aren't the first item on the leaf we can move back one and see
950 * if our ref is right next to our extent item
952 if (likely(extent_slot)) {
954 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
956 if (found_key.objectid == op->bytenr &&
957 found_key.type == BTRFS_EXTENT_ITEM_KEY &&
958 found_key.offset == op->num_bytes) {
965 * if we didn't find the extent we need to delete the backref and then
966 * search for the extent item key so we can update its ref count
969 key.objectid = op->bytenr;
970 key.type = BTRFS_EXTENT_ITEM_KEY;
971 key.offset = op->num_bytes;
973 ret = remove_extent_backref(trans, extent_root, path);
975 btrfs_release_path(extent_root, path);
976 ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
978 extent_slot = path->slots[0];
981 /* this is where we update the ref count for the extent */
982 leaf = path->nodes[0];
983 ei = btrfs_item_ptr(leaf, extent_slot, struct btrfs_extent_item);
984 refs = btrfs_extent_refs(leaf, ei);
987 btrfs_set_extent_refs(leaf, ei, refs);
989 btrfs_mark_buffer_dirty(leaf);
992 * This extent needs deleting. The reason cur_slot is extent_slot +
993 * num_to_del is because extent_slot points to the slot where the extent
994 * is, and if the backref was not right next to the extent we will be
995 * deleting at least 1 item, and will want to start searching at the
996 * slot directly next to extent_slot. However if we did find the
997 * backref next to the extent item them we will be deleting at least 2
998 * items and will want to start searching directly after the ref slot
1001 struct list_head *pos, *n, *end;
1002 int cur_slot = extent_slot+num_to_del;
1006 path->slots[0] = extent_slot;
1007 bytes_freed = op->num_bytes;
1009 mutex_lock(&info->pinned_mutex);
1010 ret = pin_down_bytes(trans, extent_root, op->bytenr,
1011 op->num_bytes, op->level >=
1012 BTRFS_FIRST_FREE_OBJECTID);
1013 mutex_unlock(&info->pinned_mutex);
1018 * we need to see if we can delete multiple things at once, so
1019 * start looping through the list of extents we are wanting to
1020 * delete and see if their extent/backref's are right next to
1021 * eachother and the extents only have 1 ref
1023 for (pos = cur->next; pos != del_list; pos = pos->next) {
1024 struct pending_extent_op *tmp;
1026 tmp = list_entry(pos, struct pending_extent_op, list);
1028 /* we only want to delete extent+ref at this stage */
1029 if (cur_slot >= btrfs_header_nritems(leaf) - 1)
1032 btrfs_item_key_to_cpu(leaf, &found_key, cur_slot);
1033 if (found_key.objectid != tmp->bytenr ||
1034 found_key.type != BTRFS_EXTENT_ITEM_KEY ||
1035 found_key.offset != tmp->num_bytes)
1038 /* check to make sure this extent only has one ref */
1039 ei = btrfs_item_ptr(leaf, cur_slot,
1040 struct btrfs_extent_item);
1041 if (btrfs_extent_refs(leaf, ei) != 1)
1044 btrfs_item_key_to_cpu(leaf, &found_key, cur_slot+1);
1045 if (found_key.objectid != tmp->bytenr ||
1046 found_key.type != BTRFS_EXTENT_REF_KEY ||
1047 found_key.offset != tmp->orig_parent)
1051 * the ref is right next to the extent, we can set the
1052 * ref count to 0 since we will delete them both now
1054 btrfs_set_extent_refs(leaf, ei, 0);
1056 /* pin down the bytes for this extent */
1057 mutex_lock(&info->pinned_mutex);
1058 ret = pin_down_bytes(trans, extent_root, tmp->bytenr,
1059 tmp->num_bytes, tmp->level >=
1060 BTRFS_FIRST_FREE_OBJECTID);
1061 mutex_unlock(&info->pinned_mutex);
1065 * use the del field to tell if we need to go ahead and
1066 * free up the extent when we delete the item or not.
1069 bytes_freed += tmp->num_bytes;
1076 /* update the free space counters */
1077 spin_lock(&info->delalloc_lock);
1078 super_used = btrfs_super_bytes_used(&info->super_copy);
1079 btrfs_set_super_bytes_used(&info->super_copy,
1080 super_used - bytes_freed);
1082 root_used = btrfs_root_used(&extent_root->root_item);
1083 btrfs_set_root_used(&extent_root->root_item,
1084 root_used - bytes_freed);
1085 spin_unlock(&info->delalloc_lock);
1087 /* delete the items */
1088 ret = btrfs_del_items(trans, extent_root, path,
1089 path->slots[0], num_to_del);
1093 * loop through the extents we deleted and do the cleanup work
1096 for (pos = cur, n = pos->next; pos != end;
1097 pos = n, n = pos->next) {
1098 struct pending_extent_op *tmp;
1099 tmp = list_entry(pos, struct pending_extent_op, list);
1102 * remember tmp->del tells us wether or not we pinned
1105 ret = update_block_group(trans, extent_root,
1106 tmp->bytenr, tmp->num_bytes, 0,
1110 list_del_init(&tmp->list);
1111 unlock_extent(&info->extent_ins, tmp->bytenr,
1112 tmp->bytenr + tmp->num_bytes - 1,
1116 } else if (refs && found_extent) {
1118 * the ref and extent were right next to eachother, but the
1119 * extent still has a ref, so just free the backref and keep
1122 ret = remove_extent_backref(trans, extent_root, path);
1125 list_del_init(&op->list);
1126 unlock_extent(&info->extent_ins, op->bytenr,
1127 op->bytenr + op->num_bytes - 1, GFP_NOFS);
1131 * the extent has multiple refs and the backref we were looking
1132 * for was not right next to it, so just unlock and go next,
1135 list_del_init(&op->list);
1136 unlock_extent(&info->extent_ins, op->bytenr,
1137 op->bytenr + op->num_bytes - 1, GFP_NOFS);
1141 btrfs_release_path(extent_root, path);
1142 if (!list_empty(del_list))
1146 btrfs_free_path(path);
1150 static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
1151 struct btrfs_root *root, u64 bytenr,
1152 u64 orig_parent, u64 parent,
1153 u64 orig_root, u64 ref_root,
1154 u64 orig_generation, u64 ref_generation,
1158 struct btrfs_root *extent_root = root->fs_info->extent_root;
1159 struct btrfs_path *path;
1161 if (root == root->fs_info->extent_root) {
1162 struct pending_extent_op *extent_op;
1165 BUG_ON(owner_objectid >= BTRFS_MAX_LEVEL);
1166 num_bytes = btrfs_level_size(root, (int)owner_objectid);
1167 mutex_lock(&root->fs_info->extent_ins_mutex);
1168 if (test_range_bit(&root->fs_info->extent_ins, bytenr,
1169 bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) {
1171 ret = get_state_private(&root->fs_info->extent_ins,
1174 extent_op = (struct pending_extent_op *)
1175 (unsigned long)priv;
1176 BUG_ON(extent_op->parent != orig_parent);
1177 BUG_ON(extent_op->generation != orig_generation);
1179 extent_op->parent = parent;
1180 extent_op->generation = ref_generation;
1182 extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
1185 extent_op->type = PENDING_BACKREF_UPDATE;
1186 extent_op->bytenr = bytenr;
1187 extent_op->num_bytes = num_bytes;
1188 extent_op->parent = parent;
1189 extent_op->orig_parent = orig_parent;
1190 extent_op->generation = ref_generation;
1191 extent_op->orig_generation = orig_generation;
1192 extent_op->level = (int)owner_objectid;
1193 INIT_LIST_HEAD(&extent_op->list);
1196 set_extent_bits(&root->fs_info->extent_ins,
1197 bytenr, bytenr + num_bytes - 1,
1198 EXTENT_WRITEBACK, GFP_NOFS);
1199 set_state_private(&root->fs_info->extent_ins,
1200 bytenr, (unsigned long)extent_op);
1202 mutex_unlock(&root->fs_info->extent_ins_mutex);
1206 path = btrfs_alloc_path();
1209 ret = lookup_extent_backref(trans, extent_root, path,
1210 bytenr, orig_parent, orig_root,
1211 orig_generation, owner_objectid, 1);
1214 ret = remove_extent_backref(trans, extent_root, path);
1217 ret = insert_extent_backref(trans, extent_root, path, bytenr,
1218 parent, ref_root, ref_generation,
1221 finish_current_insert(trans, extent_root, 0);
1222 del_pending_extents(trans, extent_root, 0);
1224 btrfs_free_path(path);
1228 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
1229 struct btrfs_root *root, u64 bytenr,
1230 u64 orig_parent, u64 parent,
1231 u64 ref_root, u64 ref_generation,
1235 if (ref_root == BTRFS_TREE_LOG_OBJECTID &&
1236 owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
1238 ret = __btrfs_update_extent_ref(trans, root, bytenr, orig_parent,
1239 parent, ref_root, ref_root,
1240 ref_generation, ref_generation,
1245 static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1246 struct btrfs_root *root, u64 bytenr,
1247 u64 orig_parent, u64 parent,
1248 u64 orig_root, u64 ref_root,
1249 u64 orig_generation, u64 ref_generation,
1252 struct btrfs_path *path;
1254 struct btrfs_key key;
1255 struct extent_buffer *l;
1256 struct btrfs_extent_item *item;
1259 path = btrfs_alloc_path();
1264 key.objectid = bytenr;
1265 key.type = BTRFS_EXTENT_ITEM_KEY;
1266 key.offset = (u64)-1;
1268 ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
1272 BUG_ON(ret == 0 || path->slots[0] == 0);
1277 btrfs_item_key_to_cpu(l, &key, path->slots[0]);
1278 if (key.objectid != bytenr) {
1279 btrfs_print_leaf(root->fs_info->extent_root, path->nodes[0]);
1280 printk(KERN_ERR "btrfs wanted %llu found %llu\n",
1281 (unsigned long long)bytenr,
1282 (unsigned long long)key.objectid);
1285 BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY);
1287 item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
1288 refs = btrfs_extent_refs(l, item);
1289 btrfs_set_extent_refs(l, item, refs + 1);
1290 btrfs_mark_buffer_dirty(path->nodes[0]);
1292 btrfs_release_path(root->fs_info->extent_root, path);
1295 ret = insert_extent_backref(trans, root->fs_info->extent_root,
1296 path, bytenr, parent,
1297 ref_root, ref_generation,
1300 finish_current_insert(trans, root->fs_info->extent_root, 0);
1301 del_pending_extents(trans, root->fs_info->extent_root, 0);
1303 btrfs_free_path(path);
1307 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1308 struct btrfs_root *root,
1309 u64 bytenr, u64 num_bytes, u64 parent,
1310 u64 ref_root, u64 ref_generation,
1314 if (ref_root == BTRFS_TREE_LOG_OBJECTID &&
1315 owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
1317 ret = __btrfs_inc_extent_ref(trans, root, bytenr, 0, parent,
1318 0, ref_root, 0, ref_generation,
1323 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
1324 struct btrfs_root *root)
1331 finish_current_insert(trans, root->fs_info->extent_root, 1);
1332 del_pending_extents(trans, root->fs_info->extent_root, 1);
1334 /* is there more work to do? */
1335 ret = find_first_extent_bit(&root->fs_info->pending_del,
1336 0, &start, &end, EXTENT_WRITEBACK);
1339 ret = find_first_extent_bit(&root->fs_info->extent_ins,
1340 0, &start, &end, EXTENT_WRITEBACK);
1348 int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans,
1349 struct btrfs_root *root, u64 bytenr,
1350 u64 num_bytes, u32 *refs)
1352 struct btrfs_path *path;
1354 struct btrfs_key key;
1355 struct extent_buffer *l;
1356 struct btrfs_extent_item *item;
1358 WARN_ON(num_bytes < root->sectorsize);
1359 path = btrfs_alloc_path();
1361 key.objectid = bytenr;
1362 key.offset = num_bytes;
1363 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1364 ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
1369 btrfs_print_leaf(root, path->nodes[0]);
1370 printk(KERN_INFO "btrfs failed to find block number %llu\n",
1371 (unsigned long long)bytenr);
1375 item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
1376 *refs = btrfs_extent_refs(l, item);
1378 btrfs_free_path(path);
1382 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
1383 struct btrfs_root *root, u64 objectid, u64 bytenr)
1385 struct btrfs_root *extent_root = root->fs_info->extent_root;
1386 struct btrfs_path *path;
1387 struct extent_buffer *leaf;
1388 struct btrfs_extent_ref *ref_item;
1389 struct btrfs_key key;
1390 struct btrfs_key found_key;
1396 key.objectid = bytenr;
1397 key.offset = (u64)-1;
1398 key.type = BTRFS_EXTENT_ITEM_KEY;
1400 path = btrfs_alloc_path();
1401 ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
1407 if (path->slots[0] == 0)
1411 leaf = path->nodes[0];
1412 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1414 if (found_key.objectid != bytenr ||
1415 found_key.type != BTRFS_EXTENT_ITEM_KEY)
1418 last_snapshot = btrfs_root_last_snapshot(&root->root_item);
1420 leaf = path->nodes[0];
1421 nritems = btrfs_header_nritems(leaf);
1422 if (path->slots[0] >= nritems) {
1423 ret = btrfs_next_leaf(extent_root, path);
1430 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1431 if (found_key.objectid != bytenr)
1434 if (found_key.type != BTRFS_EXTENT_REF_KEY) {
1439 ref_item = btrfs_item_ptr(leaf, path->slots[0],
1440 struct btrfs_extent_ref);
1441 ref_root = btrfs_ref_root(leaf, ref_item);
1442 if ((ref_root != root->root_key.objectid &&
1443 ref_root != BTRFS_TREE_LOG_OBJECTID) ||
1444 objectid != btrfs_ref_objectid(leaf, ref_item)) {
1448 if (btrfs_ref_generation(leaf, ref_item) <= last_snapshot) {
1457 btrfs_free_path(path);
1461 int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1462 struct extent_buffer *buf, u32 nr_extents)
1464 struct btrfs_key key;
1465 struct btrfs_file_extent_item *fi;
1473 if (!root->ref_cows)
1476 if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
1478 root_gen = root->root_key.offset;
1481 root_gen = trans->transid - 1;
1484 level = btrfs_header_level(buf);
1485 nritems = btrfs_header_nritems(buf);
1488 struct btrfs_leaf_ref *ref;
1489 struct btrfs_extent_info *info;
1491 ref = btrfs_alloc_leaf_ref(root, nr_extents);
1497 ref->root_gen = root_gen;
1498 ref->bytenr = buf->start;
1499 ref->owner = btrfs_header_owner(buf);
1500 ref->generation = btrfs_header_generation(buf);
1501 ref->nritems = nr_extents;
1502 info = ref->extents;
1504 for (i = 0; nr_extents > 0 && i < nritems; i++) {
1506 btrfs_item_key_to_cpu(buf, &key, i);
1507 if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
1509 fi = btrfs_item_ptr(buf, i,
1510 struct btrfs_file_extent_item);
1511 if (btrfs_file_extent_type(buf, fi) ==
1512 BTRFS_FILE_EXTENT_INLINE)
1514 disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
1515 if (disk_bytenr == 0)
1518 info->bytenr = disk_bytenr;
1520 btrfs_file_extent_disk_num_bytes(buf, fi);
1521 info->objectid = key.objectid;
1522 info->offset = key.offset;
1526 ret = btrfs_add_leaf_ref(root, ref, shared);
1527 if (ret == -EEXIST && shared) {
1528 struct btrfs_leaf_ref *old;
1529 old = btrfs_lookup_leaf_ref(root, ref->bytenr);
1531 btrfs_remove_leaf_ref(root, old);
1532 btrfs_free_leaf_ref(root, old);
1533 ret = btrfs_add_leaf_ref(root, ref, shared);
1536 btrfs_free_leaf_ref(root, ref);
1542 /* when a block goes through cow, we update the reference counts of
1543 * everything that block points to. The internal pointers of the block
1544 * can be in just about any order, and it is likely to have clusters of
1545 * things that are close together and clusters of things that are not.
1547 * To help reduce the seeks that come with updating all of these reference
1548 * counts, sort them by byte number before actual updates are done.
1550 * struct refsort is used to match byte number to slot in the btree block.
1551 * we sort based on the byte number and then use the slot to actually
1554 * struct refsort is smaller than strcut btrfs_item and smaller than
1555 * struct btrfs_key_ptr. Since we're currently limited to the page size
1556 * for a btree block, there's no way for a kmalloc of refsorts for a
1557 * single node to be bigger than a page.
1565 * for passing into sort()
1567 static int refsort_cmp(const void *a_void, const void *b_void)
1569 const struct refsort *a = a_void;
1570 const struct refsort *b = b_void;
1572 if (a->bytenr < b->bytenr)
1574 if (a->bytenr > b->bytenr)
1580 noinline int btrfs_inc_ref(struct btrfs_trans_handle *trans,
1581 struct btrfs_root *root,
1582 struct extent_buffer *orig_buf,
1583 struct extent_buffer *buf, u32 *nr_extents)
1589 u64 orig_generation;
1590 struct refsort *sorted;
1592 u32 nr_file_extents = 0;
1593 struct btrfs_key key;
1594 struct btrfs_file_extent_item *fi;
1601 int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *,
1602 u64, u64, u64, u64, u64, u64, u64, u64);
1604 ref_root = btrfs_header_owner(buf);
1605 ref_generation = btrfs_header_generation(buf);
1606 orig_root = btrfs_header_owner(orig_buf);
1607 orig_generation = btrfs_header_generation(orig_buf);
1609 nritems = btrfs_header_nritems(buf);
1610 level = btrfs_header_level(buf);
1612 sorted = kmalloc(sizeof(struct refsort) * nritems, GFP_NOFS);
1615 if (root->ref_cows) {
1616 process_func = __btrfs_inc_extent_ref;
1619 root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID)
1622 root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID)
1624 process_func = __btrfs_update_extent_ref;
1628 * we make two passes through the items. In the first pass we
1629 * only record the byte number and slot. Then we sort based on
1630 * byte number and do the actual work based on the sorted results
1632 for (i = 0; i < nritems; i++) {
1635 btrfs_item_key_to_cpu(buf, &key, i);
1636 if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
1638 fi = btrfs_item_ptr(buf, i,
1639 struct btrfs_file_extent_item);
1640 if (btrfs_file_extent_type(buf, fi) ==
1641 BTRFS_FILE_EXTENT_INLINE)
1643 bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
1648 sorted[refi].bytenr = bytenr;
1649 sorted[refi].slot = i;
1652 bytenr = btrfs_node_blockptr(buf, i);
1653 sorted[refi].bytenr = bytenr;
1654 sorted[refi].slot = i;
1659 * if refi == 0, we didn't actually put anything into the sorted
1660 * array and we're done
1665 sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
1667 for (i = 0; i < refi; i++) {
1669 slot = sorted[i].slot;
1670 bytenr = sorted[i].bytenr;
1673 btrfs_item_key_to_cpu(buf, &key, slot);
1675 ret = process_func(trans, root, bytenr,
1676 orig_buf->start, buf->start,
1677 orig_root, ref_root,
1678 orig_generation, ref_generation,
1687 ret = process_func(trans, root, bytenr,
1688 orig_buf->start, buf->start,
1689 orig_root, ref_root,
1690 orig_generation, ref_generation,
1703 *nr_extents = nr_file_extents;
1705 *nr_extents = nritems;
1714 int btrfs_update_ref(struct btrfs_trans_handle *trans,
1715 struct btrfs_root *root, struct extent_buffer *orig_buf,
1716 struct extent_buffer *buf, int start_slot, int nr)
1723 u64 orig_generation;
1724 struct btrfs_key key;
1725 struct btrfs_file_extent_item *fi;
1731 BUG_ON(start_slot < 0);
1732 BUG_ON(start_slot + nr > btrfs_header_nritems(buf));
1734 ref_root = btrfs_header_owner(buf);
1735 ref_generation = btrfs_header_generation(buf);
1736 orig_root = btrfs_header_owner(orig_buf);
1737 orig_generation = btrfs_header_generation(orig_buf);
1738 level = btrfs_header_level(buf);
1740 if (!root->ref_cows) {
1742 root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID)
1745 root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID)
1749 for (i = 0, slot = start_slot; i < nr; i++, slot++) {
1752 btrfs_item_key_to_cpu(buf, &key, slot);
1753 if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
1755 fi = btrfs_item_ptr(buf, slot,
1756 struct btrfs_file_extent_item);
1757 if (btrfs_file_extent_type(buf, fi) ==
1758 BTRFS_FILE_EXTENT_INLINE)
1760 bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
1763 ret = __btrfs_update_extent_ref(trans, root, bytenr,
1764 orig_buf->start, buf->start,
1765 orig_root, ref_root,
1766 orig_generation, ref_generation,
1771 bytenr = btrfs_node_blockptr(buf, slot);
1772 ret = __btrfs_update_extent_ref(trans, root, bytenr,
1773 orig_buf->start, buf->start,
1774 orig_root, ref_root,
1775 orig_generation, ref_generation,
1787 static int write_one_cache_group(struct btrfs_trans_handle *trans,
1788 struct btrfs_root *root,
1789 struct btrfs_path *path,
1790 struct btrfs_block_group_cache *cache)
1794 struct btrfs_root *extent_root = root->fs_info->extent_root;
1796 struct extent_buffer *leaf;
1798 ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1);
1803 leaf = path->nodes[0];
1804 bi = btrfs_item_ptr_offset(leaf, path->slots[0]);
1805 write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item));
1806 btrfs_mark_buffer_dirty(leaf);
1807 btrfs_release_path(extent_root, path);
1809 finish_current_insert(trans, extent_root, 0);
1810 pending_ret = del_pending_extents(trans, extent_root, 0);
1819 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1820 struct btrfs_root *root)
1822 struct btrfs_block_group_cache *cache, *entry;
1826 struct btrfs_path *path;
1829 path = btrfs_alloc_path();
1835 spin_lock(&root->fs_info->block_group_cache_lock);
1836 for (n = rb_first(&root->fs_info->block_group_cache_tree);
1837 n; n = rb_next(n)) {
1838 entry = rb_entry(n, struct btrfs_block_group_cache,
1845 spin_unlock(&root->fs_info->block_group_cache_lock);
1851 last += cache->key.offset;
1853 err = write_one_cache_group(trans, root,
1856 * if we fail to write the cache group, we want
1857 * to keep it marked dirty in hopes that a later
1865 btrfs_free_path(path);
1869 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr)
1871 struct btrfs_block_group_cache *block_group;
1874 block_group = btrfs_lookup_block_group(root->fs_info, bytenr);
1875 if (!block_group || block_group->ro)
1878 put_block_group(block_group);
1882 static int update_space_info(struct btrfs_fs_info *info, u64 flags,
1883 u64 total_bytes, u64 bytes_used,
1884 struct btrfs_space_info **space_info)
1886 struct btrfs_space_info *found;
1888 found = __find_space_info(info, flags);
1890 spin_lock(&found->lock);
1891 found->total_bytes += total_bytes;
1892 found->bytes_used += bytes_used;
1894 spin_unlock(&found->lock);
1895 *space_info = found;
1898 found = kzalloc(sizeof(*found), GFP_NOFS);
1902 list_add(&found->list, &info->space_info);
1903 INIT_LIST_HEAD(&found->block_groups);
1904 init_rwsem(&found->groups_sem);
1905 spin_lock_init(&found->lock);
1906 found->flags = flags;
1907 found->total_bytes = total_bytes;
1908 found->bytes_used = bytes_used;
1909 found->bytes_pinned = 0;
1910 found->bytes_reserved = 0;
1911 found->bytes_readonly = 0;
1913 found->force_alloc = 0;
1914 *space_info = found;
1918 static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
1920 u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 |
1921 BTRFS_BLOCK_GROUP_RAID1 |
1922 BTRFS_BLOCK_GROUP_RAID10 |
1923 BTRFS_BLOCK_GROUP_DUP);
1925 if (flags & BTRFS_BLOCK_GROUP_DATA)
1926 fs_info->avail_data_alloc_bits |= extra_flags;
1927 if (flags & BTRFS_BLOCK_GROUP_METADATA)
1928 fs_info->avail_metadata_alloc_bits |= extra_flags;
1929 if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
1930 fs_info->avail_system_alloc_bits |= extra_flags;
1934 static void set_block_group_readonly(struct btrfs_block_group_cache *cache)
1936 spin_lock(&cache->space_info->lock);
1937 spin_lock(&cache->lock);
1939 cache->space_info->bytes_readonly += cache->key.offset -
1940 btrfs_block_group_used(&cache->item);
1943 spin_unlock(&cache->lock);
1944 spin_unlock(&cache->space_info->lock);
1947 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags)
1949 u64 num_devices = root->fs_info->fs_devices->rw_devices;
1951 if (num_devices == 1)
1952 flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0);
1953 if (num_devices < 4)
1954 flags &= ~BTRFS_BLOCK_GROUP_RAID10;
1956 if ((flags & BTRFS_BLOCK_GROUP_DUP) &&
1957 (flags & (BTRFS_BLOCK_GROUP_RAID1 |
1958 BTRFS_BLOCK_GROUP_RAID10))) {
1959 flags &= ~BTRFS_BLOCK_GROUP_DUP;
1962 if ((flags & BTRFS_BLOCK_GROUP_RAID1) &&
1963 (flags & BTRFS_BLOCK_GROUP_RAID10)) {
1964 flags &= ~BTRFS_BLOCK_GROUP_RAID1;
1967 if ((flags & BTRFS_BLOCK_GROUP_RAID0) &&
1968 ((flags & BTRFS_BLOCK_GROUP_RAID1) |
1969 (flags & BTRFS_BLOCK_GROUP_RAID10) |
1970 (flags & BTRFS_BLOCK_GROUP_DUP)))
1971 flags &= ~BTRFS_BLOCK_GROUP_RAID0;
1975 static int do_chunk_alloc(struct btrfs_trans_handle *trans,
1976 struct btrfs_root *extent_root, u64 alloc_bytes,
1977 u64 flags, int force)
1979 struct btrfs_space_info *space_info;
1983 mutex_lock(&extent_root->fs_info->chunk_mutex);
1985 flags = btrfs_reduce_alloc_profile(extent_root, flags);
1987 space_info = __find_space_info(extent_root->fs_info, flags);
1989 ret = update_space_info(extent_root->fs_info, flags,
1993 BUG_ON(!space_info);
1995 spin_lock(&space_info->lock);
1996 if (space_info->force_alloc) {
1998 space_info->force_alloc = 0;
2000 if (space_info->full) {
2001 spin_unlock(&space_info->lock);
2005 thresh = space_info->total_bytes - space_info->bytes_readonly;
2006 thresh = div_factor(thresh, 6);
2008 (space_info->bytes_used + space_info->bytes_pinned +
2009 space_info->bytes_reserved + alloc_bytes) < thresh) {
2010 spin_unlock(&space_info->lock);
2013 spin_unlock(&space_info->lock);
2015 ret = btrfs_alloc_chunk(trans, extent_root, flags);
2017 space_info->full = 1;
2019 mutex_unlock(&extent_root->fs_info->chunk_mutex);
2023 static int update_block_group(struct btrfs_trans_handle *trans,
2024 struct btrfs_root *root,
2025 u64 bytenr, u64 num_bytes, int alloc,
2028 struct btrfs_block_group_cache *cache;
2029 struct btrfs_fs_info *info = root->fs_info;
2030 u64 total = num_bytes;
2035 cache = btrfs_lookup_block_group(info, bytenr);
2038 byte_in_group = bytenr - cache->key.objectid;
2039 WARN_ON(byte_in_group > cache->key.offset);
2041 spin_lock(&cache->space_info->lock);
2042 spin_lock(&cache->lock);
2044 old_val = btrfs_block_group_used(&cache->item);
2045 num_bytes = min(total, cache->key.offset - byte_in_group);
2047 old_val += num_bytes;
2048 cache->space_info->bytes_used += num_bytes;
2050 cache->space_info->bytes_readonly -= num_bytes;
2051 btrfs_set_block_group_used(&cache->item, old_val);
2052 spin_unlock(&cache->lock);
2053 spin_unlock(&cache->space_info->lock);
2055 old_val -= num_bytes;
2056 cache->space_info->bytes_used -= num_bytes;
2058 cache->space_info->bytes_readonly += num_bytes;
2059 btrfs_set_block_group_used(&cache->item, old_val);
2060 spin_unlock(&cache->lock);
2061 spin_unlock(&cache->space_info->lock);
2065 ret = btrfs_discard_extent(root, bytenr,
2069 ret = btrfs_add_free_space(cache, bytenr,
2074 put_block_group(cache);
2076 bytenr += num_bytes;
2081 static u64 first_logical_byte(struct btrfs_root *root, u64 search_start)
2083 struct btrfs_block_group_cache *cache;
2086 cache = btrfs_lookup_first_block_group(root->fs_info, search_start);
2090 bytenr = cache->key.objectid;
2091 put_block_group(cache);
2096 int btrfs_update_pinned_extents(struct btrfs_root *root,
2097 u64 bytenr, u64 num, int pin)
2100 struct btrfs_block_group_cache *cache;
2101 struct btrfs_fs_info *fs_info = root->fs_info;
2103 WARN_ON(!mutex_is_locked(&root->fs_info->pinned_mutex));
2105 set_extent_dirty(&fs_info->pinned_extents,
2106 bytenr, bytenr + num - 1, GFP_NOFS);
2108 clear_extent_dirty(&fs_info->pinned_extents,
2109 bytenr, bytenr + num - 1, GFP_NOFS);
2112 cache = btrfs_lookup_block_group(fs_info, bytenr);
2114 len = min(num, cache->key.offset -
2115 (bytenr - cache->key.objectid));
2117 spin_lock(&cache->space_info->lock);
2118 spin_lock(&cache->lock);
2119 cache->pinned += len;
2120 cache->space_info->bytes_pinned += len;
2121 spin_unlock(&cache->lock);
2122 spin_unlock(&cache->space_info->lock);
2123 fs_info->total_pinned += len;
2125 spin_lock(&cache->space_info->lock);
2126 spin_lock(&cache->lock);
2127 cache->pinned -= len;
2128 cache->space_info->bytes_pinned -= len;
2129 spin_unlock(&cache->lock);
2130 spin_unlock(&cache->space_info->lock);
2131 fs_info->total_pinned -= len;
2133 btrfs_add_free_space(cache, bytenr, len);
2135 put_block_group(cache);
2142 static int update_reserved_extents(struct btrfs_root *root,
2143 u64 bytenr, u64 num, int reserve)
2146 struct btrfs_block_group_cache *cache;
2147 struct btrfs_fs_info *fs_info = root->fs_info;
2150 cache = btrfs_lookup_block_group(fs_info, bytenr);
2152 len = min(num, cache->key.offset -
2153 (bytenr - cache->key.objectid));
2155 spin_lock(&cache->space_info->lock);
2156 spin_lock(&cache->lock);
2158 cache->reserved += len;
2159 cache->space_info->bytes_reserved += len;
2161 cache->reserved -= len;
2162 cache->space_info->bytes_reserved -= len;
2164 spin_unlock(&cache->lock);
2165 spin_unlock(&cache->space_info->lock);
2166 put_block_group(cache);
2173 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy)
2178 struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents;
2181 mutex_lock(&root->fs_info->pinned_mutex);
2183 ret = find_first_extent_bit(pinned_extents, last,
2184 &start, &end, EXTENT_DIRTY);
2187 set_extent_dirty(copy, start, end, GFP_NOFS);
2190 mutex_unlock(&root->fs_info->pinned_mutex);
2194 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2195 struct btrfs_root *root,
2196 struct extent_io_tree *unpin)
2202 mutex_lock(&root->fs_info->pinned_mutex);
2204 ret = find_first_extent_bit(unpin, 0, &start, &end,
2209 ret = btrfs_discard_extent(root, start, end + 1 - start);
2211 btrfs_update_pinned_extents(root, start, end + 1 - start, 0);
2212 clear_extent_dirty(unpin, start, end, GFP_NOFS);
2214 if (need_resched()) {
2215 mutex_unlock(&root->fs_info->pinned_mutex);
2217 mutex_lock(&root->fs_info->pinned_mutex);
2220 mutex_unlock(&root->fs_info->pinned_mutex);
2224 static int finish_current_insert(struct btrfs_trans_handle *trans,
2225 struct btrfs_root *extent_root, int all)
2231 struct btrfs_fs_info *info = extent_root->fs_info;
2232 struct btrfs_path *path;
2233 struct pending_extent_op *extent_op, *tmp;
2234 struct list_head insert_list, update_list;
2236 int num_inserts = 0, max_inserts, restart = 0;
2238 path = btrfs_alloc_path();
2239 INIT_LIST_HEAD(&insert_list);
2240 INIT_LIST_HEAD(&update_list);
2242 max_inserts = extent_root->leafsize /
2243 (2 * sizeof(struct btrfs_key) + 2 * sizeof(struct btrfs_item) +
2244 sizeof(struct btrfs_extent_ref) +
2245 sizeof(struct btrfs_extent_item));
2247 mutex_lock(&info->extent_ins_mutex);
2249 ret = find_first_extent_bit(&info->extent_ins, search, &start,
2250 &end, EXTENT_WRITEBACK);
2252 if (restart && !num_inserts &&
2253 list_empty(&update_list)) {
2261 ret = try_lock_extent(&info->extent_ins, start, end, GFP_NOFS);
2266 if (need_resched()) {
2267 mutex_unlock(&info->extent_ins_mutex);
2269 mutex_lock(&info->extent_ins_mutex);
2274 ret = get_state_private(&info->extent_ins, start, &priv);
2276 extent_op = (struct pending_extent_op *)(unsigned long) priv;
2278 if (extent_op->type == PENDING_EXTENT_INSERT) {
2280 list_add_tail(&extent_op->list, &insert_list);
2282 if (num_inserts == max_inserts) {
2286 } else if (extent_op->type == PENDING_BACKREF_UPDATE) {
2287 list_add_tail(&extent_op->list, &update_list);
2295 * process the update list, clear the writeback bit for it, and if
2296 * somebody marked this thing for deletion then just unlock it and be
2297 * done, the free_extents will handle it
2299 list_for_each_entry_safe(extent_op, tmp, &update_list, list) {
2300 clear_extent_bits(&info->extent_ins, extent_op->bytenr,
2301 extent_op->bytenr + extent_op->num_bytes - 1,
2302 EXTENT_WRITEBACK, GFP_NOFS);
2303 if (extent_op->del) {
2304 list_del_init(&extent_op->list);
2305 unlock_extent(&info->extent_ins, extent_op->bytenr,
2306 extent_op->bytenr + extent_op->num_bytes
2311 mutex_unlock(&info->extent_ins_mutex);
2314 * still have things left on the update list, go ahead an update
2317 if (!list_empty(&update_list)) {
2318 ret = update_backrefs(trans, extent_root, path, &update_list);
2321 /* we may have COW'ed new blocks, so lets start over */
2327 * if no inserts need to be done, but we skipped some extents and we
2328 * need to make sure everything is cleaned then reset everything and
2329 * go back to the beginning
2331 if (!num_inserts && restart) {
2334 INIT_LIST_HEAD(&update_list);
2335 INIT_LIST_HEAD(&insert_list);
2337 } else if (!num_inserts) {
2342 * process the insert extents list. Again if we are deleting this
2343 * extent, then just unlock it, pin down the bytes if need be, and be
2344 * done with it. Saves us from having to actually insert the extent
2345 * into the tree and then subsequently come along and delete it
2347 mutex_lock(&info->extent_ins_mutex);
2348 list_for_each_entry_safe(extent_op, tmp, &insert_list, list) {
2349 clear_extent_bits(&info->extent_ins, extent_op->bytenr,
2350 extent_op->bytenr + extent_op->num_bytes - 1,
2351 EXTENT_WRITEBACK, GFP_NOFS);
2352 if (extent_op->del) {
2354 list_del_init(&extent_op->list);
2355 unlock_extent(&info->extent_ins, extent_op->bytenr,
2356 extent_op->bytenr + extent_op->num_bytes
2359 mutex_lock(&extent_root->fs_info->pinned_mutex);
2360 ret = pin_down_bytes(trans, extent_root,
2362 extent_op->num_bytes, 0);
2363 mutex_unlock(&extent_root->fs_info->pinned_mutex);
2365 spin_lock(&info->delalloc_lock);
2366 used = btrfs_super_bytes_used(&info->super_copy);
2367 btrfs_set_super_bytes_used(&info->super_copy,
2368 used - extent_op->num_bytes);
2369 used = btrfs_root_used(&extent_root->root_item);
2370 btrfs_set_root_used(&extent_root->root_item,
2371 used - extent_op->num_bytes);
2372 spin_unlock(&info->delalloc_lock);
2374 ret = update_block_group(trans, extent_root,
2376 extent_op->num_bytes,
2383 mutex_unlock(&info->extent_ins_mutex);
2385 ret = insert_extents(trans, extent_root, path, &insert_list,
2390 * if restart is set for whatever reason we need to go back and start
2391 * searching through the pending list again.
2393 * We just inserted some extents, which could have resulted in new
2394 * blocks being allocated, which would result in new blocks needing
2395 * updates, so if all is set we _must_ restart to get the updated
2398 if (restart || all) {
2399 INIT_LIST_HEAD(&insert_list);
2400 INIT_LIST_HEAD(&update_list);
2407 btrfs_free_path(path);
2411 static int pin_down_bytes(struct btrfs_trans_handle *trans,
2412 struct btrfs_root *root,
2413 u64 bytenr, u64 num_bytes, int is_data)
2416 struct extent_buffer *buf;
2421 buf = btrfs_find_tree_block(root, bytenr, num_bytes);
2425 /* we can reuse a block if it hasn't been written
2426 * and it is from this transaction. We can't
2427 * reuse anything from the tree log root because
2428 * it has tiny sub-transactions.
2430 if (btrfs_buffer_uptodate(buf, 0) &&
2431 btrfs_try_tree_lock(buf)) {
2432 u64 header_owner = btrfs_header_owner(buf);
2433 u64 header_transid = btrfs_header_generation(buf);
2434 if (header_owner != BTRFS_TREE_LOG_OBJECTID &&
2435 header_owner != BTRFS_TREE_RELOC_OBJECTID &&
2436 header_transid == trans->transid &&
2437 !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
2438 clean_tree_block(NULL, root, buf);
2439 btrfs_tree_unlock(buf);
2440 free_extent_buffer(buf);
2443 btrfs_tree_unlock(buf);
2445 free_extent_buffer(buf);
2447 btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
2454 * remove an extent from the root, returns 0 on success
2456 static int __free_extent(struct btrfs_trans_handle *trans,
2457 struct btrfs_root *root,
2458 u64 bytenr, u64 num_bytes, u64 parent,
2459 u64 root_objectid, u64 ref_generation,
2460 u64 owner_objectid, int pin, int mark_free)
2462 struct btrfs_path *path;
2463 struct btrfs_key key;
2464 struct btrfs_fs_info *info = root->fs_info;
2465 struct btrfs_root *extent_root = info->extent_root;
2466 struct extent_buffer *leaf;
2468 int extent_slot = 0;
2469 int found_extent = 0;
2471 struct btrfs_extent_item *ei;
2474 key.objectid = bytenr;
2475 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
2476 key.offset = num_bytes;
2477 path = btrfs_alloc_path();
2482 ret = lookup_extent_backref(trans, extent_root, path,
2483 bytenr, parent, root_objectid,
2484 ref_generation, owner_objectid, 1);
2486 struct btrfs_key found_key;
2487 extent_slot = path->slots[0];
2488 while (extent_slot > 0) {
2490 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
2492 if (found_key.objectid != bytenr)
2494 if (found_key.type == BTRFS_EXTENT_ITEM_KEY &&
2495 found_key.offset == num_bytes) {
2499 if (path->slots[0] - extent_slot > 5)
2502 if (!found_extent) {
2503 ret = remove_extent_backref(trans, extent_root, path);
2505 btrfs_release_path(extent_root, path);
2506 ret = btrfs_search_slot(trans, extent_root,
2509 printk(KERN_ERR "umm, got %d back from search"
2510 ", was looking for %llu\n", ret,
2511 (unsigned long long)bytenr);
2512 btrfs_print_leaf(extent_root, path->nodes[0]);
2515 extent_slot = path->slots[0];
2518 btrfs_print_leaf(extent_root, path->nodes[0]);
2520 printk(KERN_ERR "btrfs unable to find ref byte nr %llu "
2521 "root %llu gen %llu owner %llu\n",
2522 (unsigned long long)bytenr,
2523 (unsigned long long)root_objectid,
2524 (unsigned long long)ref_generation,
2525 (unsigned long long)owner_objectid);
2528 leaf = path->nodes[0];
2529 ei = btrfs_item_ptr(leaf, extent_slot,
2530 struct btrfs_extent_item);
2531 refs = btrfs_extent_refs(leaf, ei);
2534 btrfs_set_extent_refs(leaf, ei, refs);
2536 btrfs_mark_buffer_dirty(leaf);
2538 if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) {
2539 struct btrfs_extent_ref *ref;
2540 ref = btrfs_item_ptr(leaf, path->slots[0],
2541 struct btrfs_extent_ref);
2542 BUG_ON(btrfs_ref_num_refs(leaf, ref) != 1);
2543 /* if the back ref and the extent are next to each other
2544 * they get deleted below in one shot
2546 path->slots[0] = extent_slot;
2548 } else if (found_extent) {
2549 /* otherwise delete the extent back ref */
2550 ret = remove_extent_backref(trans, extent_root, path);
2552 /* if refs are 0, we need to setup the path for deletion */
2554 btrfs_release_path(extent_root, path);
2555 ret = btrfs_search_slot(trans, extent_root, &key, path,
2566 mutex_lock(&root->fs_info->pinned_mutex);
2567 ret = pin_down_bytes(trans, root, bytenr, num_bytes,
2568 owner_objectid >= BTRFS_FIRST_FREE_OBJECTID);
2569 mutex_unlock(&root->fs_info->pinned_mutex);
2574 /* block accounting for super block */
2575 spin_lock(&info->delalloc_lock);
2576 super_used = btrfs_super_bytes_used(&info->super_copy);
2577 btrfs_set_super_bytes_used(&info->super_copy,
2578 super_used - num_bytes);
2580 /* block accounting for root item */
2581 root_used = btrfs_root_used(&root->root_item);
2582 btrfs_set_root_used(&root->root_item,
2583 root_used - num_bytes);
2584 spin_unlock(&info->delalloc_lock);
2585 ret = btrfs_del_items(trans, extent_root, path, path->slots[0],
2588 btrfs_release_path(extent_root, path);
2590 if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
2591 ret = btrfs_del_csums(trans, root, bytenr, num_bytes);
2595 ret = update_block_group(trans, root, bytenr, num_bytes, 0,
2599 btrfs_free_path(path);
2600 finish_current_insert(trans, extent_root, 0);
2605 * find all the blocks marked as pending in the radix tree and remove
2606 * them from the extent map
2608 static int del_pending_extents(struct btrfs_trans_handle *trans,
2609 struct btrfs_root *extent_root, int all)
2617 int nr = 0, skipped = 0;
2618 struct extent_io_tree *pending_del;
2619 struct extent_io_tree *extent_ins;
2620 struct pending_extent_op *extent_op;
2621 struct btrfs_fs_info *info = extent_root->fs_info;
2622 struct list_head delete_list;
2624 INIT_LIST_HEAD(&delete_list);
2625 extent_ins = &extent_root->fs_info->extent_ins;
2626 pending_del = &extent_root->fs_info->pending_del;
2629 mutex_lock(&info->extent_ins_mutex);
2631 ret = find_first_extent_bit(pending_del, search, &start, &end,
2634 if (all && skipped && !nr) {
2639 mutex_unlock(&info->extent_ins_mutex);
2643 ret = try_lock_extent(extent_ins, start, end, GFP_NOFS);
2648 if (need_resched()) {
2649 mutex_unlock(&info->extent_ins_mutex);
2651 mutex_lock(&info->extent_ins_mutex);
2658 ret = get_state_private(pending_del, start, &priv);
2660 extent_op = (struct pending_extent_op *)(unsigned long)priv;
2662 clear_extent_bits(pending_del, start, end, EXTENT_WRITEBACK,
2664 if (!test_range_bit(extent_ins, start, end,
2665 EXTENT_WRITEBACK, 0)) {
2666 list_add_tail(&extent_op->list, &delete_list);
2671 ret = get_state_private(&info->extent_ins, start,
2674 extent_op = (struct pending_extent_op *)
2675 (unsigned long)priv;
2677 clear_extent_bits(&info->extent_ins, start, end,
2678 EXTENT_WRITEBACK, GFP_NOFS);
2680 if (extent_op->type == PENDING_BACKREF_UPDATE) {
2681 list_add_tail(&extent_op->list, &delete_list);
2687 mutex_lock(&extent_root->fs_info->pinned_mutex);
2688 ret = pin_down_bytes(trans, extent_root, start,
2689 end + 1 - start, 0);
2690 mutex_unlock(&extent_root->fs_info->pinned_mutex);
2692 ret = update_block_group(trans, extent_root, start,
2693 end + 1 - start, 0, ret > 0);
2695 unlock_extent(extent_ins, start, end, GFP_NOFS);
2704 if (need_resched()) {
2705 mutex_unlock(&info->extent_ins_mutex);
2707 mutex_lock(&info->extent_ins_mutex);
2712 ret = free_extents(trans, extent_root, &delete_list);
2716 if (all && skipped) {
2717 INIT_LIST_HEAD(&delete_list);
2724 finish_current_insert(trans, extent_root, 0);
2729 * remove an extent from the root, returns 0 on success
2731 static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
2732 struct btrfs_root *root,
2733 u64 bytenr, u64 num_bytes, u64 parent,
2734 u64 root_objectid, u64 ref_generation,
2735 u64 owner_objectid, int pin)
2737 struct btrfs_root *extent_root = root->fs_info->extent_root;
2741 WARN_ON(num_bytes < root->sectorsize);
2742 if (root == extent_root) {
2743 struct pending_extent_op *extent_op = NULL;
2745 mutex_lock(&root->fs_info->extent_ins_mutex);
2746 if (test_range_bit(&root->fs_info->extent_ins, bytenr,
2747 bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) {
2749 ret = get_state_private(&root->fs_info->extent_ins,
2752 extent_op = (struct pending_extent_op *)
2753 (unsigned long)priv;
2756 if (extent_op->type == PENDING_EXTENT_INSERT) {
2757 mutex_unlock(&root->fs_info->extent_ins_mutex);
2763 ref_generation = extent_op->orig_generation;
2764 parent = extent_op->orig_parent;
2767 extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
2770 extent_op->type = PENDING_EXTENT_DELETE;
2771 extent_op->bytenr = bytenr;
2772 extent_op->num_bytes = num_bytes;
2773 extent_op->parent = parent;
2774 extent_op->orig_parent = parent;
2775 extent_op->generation = ref_generation;
2776 extent_op->orig_generation = ref_generation;
2777 extent_op->level = (int)owner_objectid;
2778 INIT_LIST_HEAD(&extent_op->list);
2781 set_extent_bits(&root->fs_info->pending_del,
2782 bytenr, bytenr + num_bytes - 1,
2783 EXTENT_WRITEBACK, GFP_NOFS);
2784 set_state_private(&root->fs_info->pending_del,
2785 bytenr, (unsigned long)extent_op);
2786 mutex_unlock(&root->fs_info->extent_ins_mutex);
2789 /* if metadata always pin */
2790 if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) {
2791 if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
2792 mutex_lock(&root->fs_info->pinned_mutex);
2793 btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
2794 mutex_unlock(&root->fs_info->pinned_mutex);
2795 update_reserved_extents(root, bytenr, num_bytes, 0);
2801 /* if data pin when any transaction has committed this */
2802 if (ref_generation != trans->transid)
2805 ret = __free_extent(trans, root, bytenr, num_bytes, parent,
2806 root_objectid, ref_generation,
2807 owner_objectid, pin, pin == 0);
2809 finish_current_insert(trans, root->fs_info->extent_root, 0);
2810 pending_ret = del_pending_extents(trans, root->fs_info->extent_root, 0);
2811 return ret ? ret : pending_ret;
2814 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2815 struct btrfs_root *root,
2816 u64 bytenr, u64 num_bytes, u64 parent,
2817 u64 root_objectid, u64 ref_generation,
2818 u64 owner_objectid, int pin)
2822 ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, parent,
2823 root_objectid, ref_generation,
2824 owner_objectid, pin);
2828 static u64 stripe_align(struct btrfs_root *root, u64 val)
2830 u64 mask = ((u64)root->stripesize - 1);
2831 u64 ret = (val + mask) & ~mask;
2836 * walks the btree of allocated extents and find a hole of a given size.
2837 * The key ins is changed to record the hole:
2838 * ins->objectid == block start
2839 * ins->flags = BTRFS_EXTENT_ITEM_KEY
2840 * ins->offset == number of blocks
2841 * Any available blocks before search_start are skipped.
2843 static noinline int find_free_extent(struct btrfs_trans_handle *trans,
2844 struct btrfs_root *orig_root,
2845 u64 num_bytes, u64 empty_size,
2846 u64 search_start, u64 search_end,
2847 u64 hint_byte, struct btrfs_key *ins,
2848 u64 exclude_start, u64 exclude_nr,
2852 struct btrfs_root *root = orig_root->fs_info->extent_root;
2853 u64 total_needed = num_bytes;
2854 u64 *last_ptr = NULL;
2855 u64 last_wanted = 0;
2856 struct btrfs_block_group_cache *block_group = NULL;
2857 int chunk_alloc_done = 0;
2858 int empty_cluster = 2 * 1024 * 1024;
2859 int allowed_chunk_alloc = 0;
2860 struct list_head *head = NULL, *cur = NULL;
2863 struct btrfs_space_info *space_info;
2865 WARN_ON(num_bytes < root->sectorsize);
2866 btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
2870 if (orig_root->ref_cows || empty_size)
2871 allowed_chunk_alloc = 1;
2873 if (data & BTRFS_BLOCK_GROUP_METADATA) {
2874 last_ptr = &root->fs_info->last_alloc;
2875 if (!btrfs_test_opt(root, SSD))
2876 empty_cluster = 64 * 1024;
2879 if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD))
2880 last_ptr = &root->fs_info->last_data_alloc;
2884 hint_byte = *last_ptr;
2885 last_wanted = *last_ptr;
2887 empty_size += empty_cluster;
2891 search_start = max(search_start, first_logical_byte(root, 0));
2892 search_start = max(search_start, hint_byte);
2894 if (last_wanted && search_start != last_wanted) {
2896 empty_size += empty_cluster;
2899 total_needed += empty_size;
2900 block_group = btrfs_lookup_block_group(root->fs_info, search_start);
2902 block_group = btrfs_lookup_first_block_group(root->fs_info,
2904 space_info = __find_space_info(root->fs_info, data);
2906 down_read(&space_info->groups_sem);
2908 struct btrfs_free_space *free_space;
2910 * the only way this happens if our hint points to a block
2911 * group thats not of the proper type, while looping this
2912 * should never happen
2918 goto new_group_no_lock;
2920 if (unlikely(!block_group->cached)) {
2921 mutex_lock(&block_group->cache_mutex);
2922 ret = cache_block_group(root, block_group);
2923 mutex_unlock(&block_group->cache_mutex);
2928 mutex_lock(&block_group->alloc_mutex);
2929 if (unlikely(!block_group_bits(block_group, data)))
2932 if (unlikely(block_group->ro))
2935 free_space = btrfs_find_free_space(block_group, search_start,
2938 u64 start = block_group->key.objectid;
2939 u64 end = block_group->key.objectid +
2940 block_group->key.offset;
2942 search_start = stripe_align(root, free_space->offset);
2944 /* move on to the next group */
2945 if (search_start + num_bytes >= search_end)
2948 /* move on to the next group */
2949 if (search_start + num_bytes > end)
2952 if (last_wanted && search_start != last_wanted) {
2953 total_needed += empty_cluster;
2954 empty_size += empty_cluster;
2957 * if search_start is still in this block group
2958 * then we just re-search this block group
2960 if (search_start >= start &&
2961 search_start < end) {
2962 mutex_unlock(&block_group->alloc_mutex);
2966 /* else we go to the next block group */
2970 if (exclude_nr > 0 &&
2971 (search_start + num_bytes > exclude_start &&
2972 search_start < exclude_start + exclude_nr)) {
2973 search_start = exclude_start + exclude_nr;
2975 * if search_start is still in this block group
2976 * then we just re-search this block group
2978 if (search_start >= start &&
2979 search_start < end) {
2980 mutex_unlock(&block_group->alloc_mutex);
2985 /* else we go to the next block group */
2989 ins->objectid = search_start;
2990 ins->offset = num_bytes;
2992 btrfs_remove_free_space_lock(block_group, search_start,
2994 /* we are all good, lets return */
2995 mutex_unlock(&block_group->alloc_mutex);
2999 mutex_unlock(&block_group->alloc_mutex);
3000 put_block_group(block_group);
3003 /* don't try to compare new allocations against the
3004 * last allocation any more
3009 * Here's how this works.
3010 * loop == 0: we were searching a block group via a hint
3011 * and didn't find anything, so we start at
3012 * the head of the block groups and keep searching
3013 * loop == 1: we're searching through all of the block groups
3014 * if we hit the head again we have searched
3015 * all of the block groups for this space and we
3016 * need to try and allocate, if we cant error out.
3017 * loop == 2: we allocated more space and are looping through
3018 * all of the block groups again.
3021 head = &space_info->block_groups;
3024 } else if (loop == 1 && cur == head) {
3027 /* at this point we give up on the empty_size
3028 * allocations and just try to allocate the min
3031 * The extra_loop field was set if an empty_size
3032 * allocation was attempted above, and if this
3033 * is try we need to try the loop again without
3034 * the additional empty_size.
3036 total_needed -= empty_size;
3038 keep_going = extra_loop;
3041 if (allowed_chunk_alloc && !chunk_alloc_done) {
3042 up_read(&space_info->groups_sem);
3043 ret = do_chunk_alloc(trans, root, num_bytes +
3044 2 * 1024 * 1024, data, 1);
3045 down_read(&space_info->groups_sem);
3048 head = &space_info->block_groups;
3050 * we've allocated a new chunk, keep
3054 chunk_alloc_done = 1;
3055 } else if (!allowed_chunk_alloc) {
3056 space_info->force_alloc = 1;
3065 } else if (cur == head) {
3069 block_group = list_entry(cur, struct btrfs_block_group_cache,
3071 atomic_inc(&block_group->count);
3073 search_start = block_group->key.objectid;
3077 /* we found what we needed */
3078 if (ins->objectid) {
3079 if (!(data & BTRFS_BLOCK_GROUP_DATA))
3080 trans->block_group = block_group->key.objectid;
3083 *last_ptr = ins->objectid + ins->offset;
3086 printk(KERN_ERR "btrfs searching for %llu bytes, "
3087 "num_bytes %llu, loop %d, allowed_alloc %d\n",
3088 (unsigned long long)total_needed,
3089 (unsigned long long)num_bytes,
3090 loop, allowed_chunk_alloc);
3094 put_block_group(block_group);
3096 up_read(&space_info->groups_sem);
3100 static void dump_space_info(struct btrfs_space_info *info, u64 bytes)
3102 struct btrfs_block_group_cache *cache;
3104 printk(KERN_INFO "space_info has %llu free, is %sfull\n",
3105 (unsigned long long)(info->total_bytes - info->bytes_used -
3106 info->bytes_pinned - info->bytes_reserved),
3107 (info->full) ? "" : "not ");
3109 down_read(&info->groups_sem);
3110 list_for_each_entry(cache, &info->block_groups, list) {
3111 spin_lock(&cache->lock);
3112 printk(KERN_INFO "block group %llu has %llu bytes, %llu used "
3113 "%llu pinned %llu reserved\n",
3114 (unsigned long long)cache->key.objectid,
3115 (unsigned long long)cache->key.offset,
3116 (unsigned long long)btrfs_block_group_used(&cache->item),
3117 (unsigned long long)cache->pinned,
3118 (unsigned long long)cache->reserved);
3119 btrfs_dump_free_space(cache, bytes);
3120 spin_unlock(&cache->lock);
3122 up_read(&info->groups_sem);
3125 static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans,
3126 struct btrfs_root *root,
3127 u64 num_bytes, u64 min_alloc_size,
3128 u64 empty_size, u64 hint_byte,
3129 u64 search_end, struct btrfs_key *ins,
3133 u64 search_start = 0;
3135 struct btrfs_fs_info *info = root->fs_info;
3138 alloc_profile = info->avail_data_alloc_bits &
3139 info->data_alloc_profile;
3140 data = BTRFS_BLOCK_GROUP_DATA | alloc_profile;
3141 } else if (root == root->fs_info->chunk_root) {
3142 alloc_profile = info->avail_system_alloc_bits &
3143 info->system_alloc_profile;
3144 data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile;
3146 alloc_profile = info->avail_metadata_alloc_bits &
3147 info->metadata_alloc_profile;
3148 data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
3151 data = btrfs_reduce_alloc_profile(root, data);
3153 * the only place that sets empty_size is btrfs_realloc_node, which
3154 * is not called recursively on allocations
3156 if (empty_size || root->ref_cows) {
3157 if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
3158 ret = do_chunk_alloc(trans, root->fs_info->extent_root,
3160 BTRFS_BLOCK_GROUP_METADATA |
3161 (info->metadata_alloc_profile &
3162 info->avail_metadata_alloc_bits), 0);
3164 ret = do_chunk_alloc(trans, root->fs_info->extent_root,
3165 num_bytes + 2 * 1024 * 1024, data, 0);
3168 WARN_ON(num_bytes < root->sectorsize);
3169 ret = find_free_extent(trans, root, num_bytes, empty_size,
3170 search_start, search_end, hint_byte, ins,
3171 trans->alloc_exclude_start,
3172 trans->alloc_exclude_nr, data);
3174 if (ret == -ENOSPC && num_bytes > min_alloc_size) {
3175 num_bytes = num_bytes >> 1;
3176 num_bytes = num_bytes & ~(root->sectorsize - 1);
3177 num_bytes = max(num_bytes, min_alloc_size);
3178 do_chunk_alloc(trans, root->fs_info->extent_root,
3179 num_bytes, data, 1);
3183 struct btrfs_space_info *sinfo;
3185 sinfo = __find_space_info(root->fs_info, data);
3186 printk(KERN_ERR "btrfs allocation failed flags %llu, "
3187 "wanted %llu\n", (unsigned long long)data,
3188 (unsigned long long)num_bytes);
3189 dump_space_info(sinfo, num_bytes);
3196 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len)
3198 struct btrfs_block_group_cache *cache;
3201 cache = btrfs_lookup_block_group(root->fs_info, start);
3203 printk(KERN_ERR "Unable to find block group for %llu\n",
3204 (unsigned long long)start);
3208 ret = btrfs_discard_extent(root, start, len);
3210 btrfs_add_free_space(cache, start, len);
3211 put_block_group(cache);
3212 update_reserved_extents(root, start, len, 0);
3217 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
3218 struct btrfs_root *root,
3219 u64 num_bytes, u64 min_alloc_size,
3220 u64 empty_size, u64 hint_byte,
3221 u64 search_end, struct btrfs_key *ins,
3225 ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size,
3226 empty_size, hint_byte, search_end, ins,
3228 update_reserved_extents(root, ins->objectid, ins->offset, 1);
3232 static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
3233 struct btrfs_root *root, u64 parent,
3234 u64 root_objectid, u64 ref_generation,
3235 u64 owner, struct btrfs_key *ins)
3241 u64 num_bytes = ins->offset;
3243 struct btrfs_fs_info *info = root->fs_info;
3244 struct btrfs_root *extent_root = info->extent_root;
3245 struct btrfs_extent_item *extent_item;
3246 struct btrfs_extent_ref *ref;
3247 struct btrfs_path *path;
3248 struct btrfs_key keys[2];
3251 parent = ins->objectid;
3253 /* block accounting for super block */
3254 spin_lock(&info->delalloc_lock);
3255 super_used = btrfs_super_bytes_used(&info->super_copy);
3256 btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes);
3258 /* block accounting for root item */
3259 root_used = btrfs_root_used(&root->root_item);
3260 btrfs_set_root_used(&root->root_item, root_used + num_bytes);
3261 spin_unlock(&info->delalloc_lock);
3263 if (root == extent_root) {
3264 struct pending_extent_op *extent_op;
3266 extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS);
3269 extent_op->type = PENDING_EXTENT_INSERT;
3270 extent_op->bytenr = ins->objectid;
3271 extent_op->num_bytes = ins->offset;
3272 extent_op->parent = parent;
3273 extent_op->orig_parent = 0;
3274 extent_op->generation = ref_generation;
3275 extent_op->orig_generation = 0;
3276 extent_op->level = (int)owner;
3277 INIT_LIST_HEAD(&extent_op->list);
3280 mutex_lock(&root->fs_info->extent_ins_mutex);
3281 set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
3282 ins->objectid + ins->offset - 1,
3283 EXTENT_WRITEBACK, GFP_NOFS);
3284 set_state_private(&root->fs_info->extent_ins,
3285 ins->objectid, (unsigned long)extent_op);
3286 mutex_unlock(&root->fs_info->extent_ins_mutex);
3290 memcpy(&keys[0], ins, sizeof(*ins));
3291 keys[1].objectid = ins->objectid;
3292 keys[1].type = BTRFS_EXTENT_REF_KEY;
3293 keys[1].offset = parent;
3294 sizes[0] = sizeof(*extent_item);
3295 sizes[1] = sizeof(*ref);
3297 path = btrfs_alloc_path();
3300 ret = btrfs_insert_empty_items(trans, extent_root, path, keys,
3304 extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
3305 struct btrfs_extent_item);
3306 btrfs_set_extent_refs(path->nodes[0], extent_item, 1);
3307 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
3308 struct btrfs_extent_ref);
3310 btrfs_set_ref_root(path->nodes[0], ref, root_objectid);
3311 btrfs_set_ref_generation(path->nodes[0], ref, ref_generation);
3312 btrfs_set_ref_objectid(path->nodes[0], ref, owner);
3313 btrfs_set_ref_num_refs(path->nodes[0], ref, 1);
3315 btrfs_mark_buffer_dirty(path->nodes[0]);
3317 trans->alloc_exclude_start = 0;
3318 trans->alloc_exclude_nr = 0;
3319 btrfs_free_path(path);
3320 finish_current_insert(trans, extent_root, 0);
3321 pending_ret = del_pending_extents(trans, extent_root, 0);
3331 ret = update_block_group(trans, root, ins->objectid,
3334 printk(KERN_ERR "btrfs update block group failed for %llu "
3335 "%llu\n", (unsigned long long)ins->objectid,
3336 (unsigned long long)ins->offset);
3343 int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
3344 struct btrfs_root *root, u64 parent,
3345 u64 root_objectid, u64 ref_generation,
3346 u64 owner, struct btrfs_key *ins)
3350 if (root_objectid == BTRFS_TREE_LOG_OBJECTID)
3352 ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid,
3353 ref_generation, owner, ins);
3354 update_reserved_extents(root, ins->objectid, ins->offset, 0);
3359 * this is used by the tree logging recovery code. It records that
3360 * an extent has been allocated and makes sure to clear the free
3361 * space cache bits as well
3363 int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans,
3364 struct btrfs_root *root, u64 parent,
3365 u64 root_objectid, u64 ref_generation,
3366 u64 owner, struct btrfs_key *ins)
3369 struct btrfs_block_group_cache *block_group;
3371 block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid);
3372 mutex_lock(&block_group->cache_mutex);
3373 cache_block_group(root, block_group);
3374 mutex_unlock(&block_group->cache_mutex);
3376 ret = btrfs_remove_free_space(block_group, ins->objectid,
3379 put_block_group(block_group);
3380 ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid,
3381 ref_generation, owner, ins);
3386 * finds a free extent and does all the dirty work required for allocation
3387 * returns the key for the extent through ins, and a tree buffer for
3388 * the first block of the extent through buf.
3390 * returns 0 if everything worked, non-zero otherwise.
3392 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
3393 struct btrfs_root *root,
3394 u64 num_bytes, u64 parent, u64 min_alloc_size,
3395 u64 root_objectid, u64 ref_generation,
3396 u64 owner_objectid, u64 empty_size, u64 hint_byte,
3397 u64 search_end, struct btrfs_key *ins, u64 data)
3401 ret = __btrfs_reserve_extent(trans, root, num_bytes,
3402 min_alloc_size, empty_size, hint_byte,
3403 search_end, ins, data);
3405 if (root_objectid != BTRFS_TREE_LOG_OBJECTID) {
3406 ret = __btrfs_alloc_reserved_extent(trans, root, parent,
3407 root_objectid, ref_generation,
3408 owner_objectid, ins);
3412 update_reserved_extents(root, ins->objectid, ins->offset, 1);
3417 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
3418 struct btrfs_root *root,
3419 u64 bytenr, u32 blocksize)
3421 struct extent_buffer *buf;
3423 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
3425 return ERR_PTR(-ENOMEM);
3426 btrfs_set_header_generation(buf, trans->transid);
3427 btrfs_tree_lock(buf);
3428 clean_tree_block(trans, root, buf);
3430 btrfs_set_lock_blocking(buf);
3431 btrfs_set_buffer_uptodate(buf);
3433 if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
3434 set_extent_dirty(&root->dirty_log_pages, buf->start,
3435 buf->start + buf->len - 1, GFP_NOFS);
3437 set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
3438 buf->start + buf->len - 1, GFP_NOFS);
3440 trans->blocks_used++;
3441 /* this returns a buffer locked for blocking */
3446 * helper function to allocate a block for a given tree
3447 * returns the tree buffer or NULL.
3449 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
3450 struct btrfs_root *root,
3451 u32 blocksize, u64 parent,
3458 struct btrfs_key ins;
3460 struct extent_buffer *buf;
3462 ret = btrfs_alloc_extent(trans, root, blocksize, parent, blocksize,
3463 root_objectid, ref_generation, level,
3464 empty_size, hint, (u64)-1, &ins, 0);
3467 return ERR_PTR(ret);
3470 buf = btrfs_init_new_buffer(trans, root, ins.objectid, blocksize);
3474 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
3475 struct btrfs_root *root, struct extent_buffer *leaf)
3478 u64 leaf_generation;
3479 struct refsort *sorted;
3480 struct btrfs_key key;
3481 struct btrfs_file_extent_item *fi;
3488 BUG_ON(!btrfs_is_leaf(leaf));
3489 nritems = btrfs_header_nritems(leaf);
3490 leaf_owner = btrfs_header_owner(leaf);
3491 leaf_generation = btrfs_header_generation(leaf);
3493 sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS);
3494 /* we do this loop twice. The first time we build a list
3495 * of the extents we have a reference on, then we sort the list
3496 * by bytenr. The second time around we actually do the
3499 for (i = 0; i < nritems; i++) {
3503 btrfs_item_key_to_cpu(leaf, &key, i);
3505 /* only extents have references, skip everything else */
3506 if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
3509 fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
3511 /* inline extents live in the btree, they don't have refs */
3512 if (btrfs_file_extent_type(leaf, fi) ==
3513 BTRFS_FILE_EXTENT_INLINE)
3516 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
3518 /* holes don't have refs */
3519 if (disk_bytenr == 0)
3522 sorted[refi].bytenr = disk_bytenr;
3523 sorted[refi].slot = i;
3530 sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
3532 for (i = 0; i < refi; i++) {
3535 disk_bytenr = sorted[i].bytenr;
3536 slot = sorted[i].slot;
3540 btrfs_item_key_to_cpu(leaf, &key, slot);
3541 if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
3544 fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
3546 ret = __btrfs_free_extent(trans, root, disk_bytenr,
3547 btrfs_file_extent_disk_num_bytes(leaf, fi),
3548 leaf->start, leaf_owner, leaf_generation,
3552 atomic_inc(&root->fs_info->throttle_gen);
3553 wake_up(&root->fs_info->transaction_throttle);
3561 static noinline int cache_drop_leaf_ref(struct btrfs_trans_handle *trans,
3562 struct btrfs_root *root,
3563 struct btrfs_leaf_ref *ref)
3567 struct btrfs_extent_info *info;
3568 struct refsort *sorted;
3570 if (ref->nritems == 0)
3573 sorted = kmalloc(sizeof(*sorted) * ref->nritems, GFP_NOFS);
3574 for (i = 0; i < ref->nritems; i++) {
3575 sorted[i].bytenr = ref->extents[i].bytenr;
3578 sort(sorted, ref->nritems, sizeof(struct refsort), refsort_cmp, NULL);
3581 * the items in the ref were sorted when the ref was inserted
3582 * into the ref cache, so this is already in order
3584 for (i = 0; i < ref->nritems; i++) {
3585 info = ref->extents + sorted[i].slot;
3586 ret = __btrfs_free_extent(trans, root, info->bytenr,
3587 info->num_bytes, ref->bytenr,
3588 ref->owner, ref->generation,
3591 atomic_inc(&root->fs_info->throttle_gen);
3592 wake_up(&root->fs_info->transaction_throttle);
3603 static int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start,
3608 ret = btrfs_lookup_extent_ref(NULL, root, start, len, refs);
3611 #if 0 /* some debugging code in case we see problems here */
3612 /* if the refs count is one, it won't get increased again. But
3613 * if the ref count is > 1, someone may be decreasing it at
3614 * the same time we are.
3617 struct extent_buffer *eb = NULL;
3618 eb = btrfs_find_create_tree_block(root, start, len);
3620 btrfs_tree_lock(eb);
3622 mutex_lock(&root->fs_info->alloc_mutex);
3623 ret = lookup_extent_ref(NULL, root, start, len, refs);
3625 mutex_unlock(&root->fs_info->alloc_mutex);
3628 btrfs_tree_unlock(eb);
3629 free_extent_buffer(eb);
3632 printk(KERN_ERR "btrfs block %llu went down to one "
3633 "during drop_snap\n", (unsigned long long)start);
3644 * this is used while deleting old snapshots, and it drops the refs
3645 * on a whole subtree starting from a level 1 node.
3647 * The idea is to sort all the leaf pointers, and then drop the
3648 * ref on all the leaves in order. Most of the time the leaves
3649 * will have ref cache entries, so no leaf IOs will be required to
3650 * find the extents they have references on.
3652 * For each leaf, any references it has are also dropped in order
3654 * This ends up dropping the references in something close to optimal
3655 * order for reading and modifying the extent allocation tree.
3657 static noinline int drop_level_one_refs(struct btrfs_trans_handle *trans,
3658 struct btrfs_root *root,
3659 struct btrfs_path *path)
3664 struct extent_buffer *eb = path->nodes[1];
3665 struct extent_buffer *leaf;
3666 struct btrfs_leaf_ref *ref;
3667 struct refsort *sorted = NULL;
3668 int nritems = btrfs_header_nritems(eb);
3672 int slot = path->slots[1];
3673 u32 blocksize = btrfs_level_size(root, 0);
3679 root_owner = btrfs_header_owner(eb);
3680 root_gen = btrfs_header_generation(eb);
3681 sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS);
3684 * step one, sort all the leaf pointers so we don't scribble
3685 * randomly into the extent allocation tree
3687 for (i = slot; i < nritems; i++) {
3688 sorted[refi].bytenr = btrfs_node_blockptr(eb, i);
3689 sorted[refi].slot = i;
3694 * nritems won't be zero, but if we're picking up drop_snapshot
3695 * after a crash, slot might be > 0, so double check things
3701 sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
3704 * the first loop frees everything the leaves point to
3706 for (i = 0; i < refi; i++) {
3709 bytenr = sorted[i].bytenr;
3712 * check the reference count on this leaf. If it is > 1
3713 * we just decrement it below and don't update any
3714 * of the refs the leaf points to.
3716 ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs);
3721 ptr_gen = btrfs_node_ptr_generation(eb, sorted[i].slot);
3724 * the leaf only had one reference, which means the
3725 * only thing pointing to this leaf is the snapshot
3726 * we're deleting. It isn't possible for the reference
3727 * count to increase again later
3729 * The reference cache is checked for the leaf,
3730 * and if found we'll be able to drop any refs held by
3731 * the leaf without needing to read it in.
3733 ref = btrfs_lookup_leaf_ref(root, bytenr);
3734 if (ref && ref->generation != ptr_gen) {
3735 btrfs_free_leaf_ref(root, ref);
3739 ret = cache_drop_leaf_ref(trans, root, ref);
3741 btrfs_remove_leaf_ref(root, ref);
3742 btrfs_free_leaf_ref(root, ref);
3745 * the leaf wasn't in the reference cache, so
3746 * we have to read it.
3748 leaf = read_tree_block(root, bytenr, blocksize,
3750 ret = btrfs_drop_leaf_ref(trans, root, leaf);
3752 free_extent_buffer(leaf);
3754 atomic_inc(&root->fs_info->throttle_gen);
3755 wake_up(&root->fs_info->transaction_throttle);
3760 * run through the loop again to free the refs on the leaves.
3761 * This is faster than doing it in the loop above because
3762 * the leaves are likely to be clustered together. We end up
3763 * working in nice chunks on the extent allocation tree.
3765 for (i = 0; i < refi; i++) {
3766 bytenr = sorted[i].bytenr;
3767 ret = __btrfs_free_extent(trans, root, bytenr,
3768 blocksize, eb->start,
3769 root_owner, root_gen, 0, 1);
3772 atomic_inc(&root->fs_info->throttle_gen);
3773 wake_up(&root->fs_info->transaction_throttle);
3780 * update the path to show we've processed the entire level 1
3781 * node. This will get saved into the root's drop_snapshot_progress
3782 * field so these drops are not repeated again if this transaction
3785 path->slots[1] = nritems;
3790 * helper function for drop_snapshot, this walks down the tree dropping ref
3791 * counts as it goes.
3793 static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
3794 struct btrfs_root *root,
3795 struct btrfs_path *path, int *level)
3801 struct extent_buffer *next;
3802 struct extent_buffer *cur;
3803 struct extent_buffer *parent;
3808 WARN_ON(*level < 0);
3809 WARN_ON(*level >= BTRFS_MAX_LEVEL);
3810 ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start,
3811 path->nodes[*level]->len, &refs);
3817 * walk down to the last node level and free all the leaves
3819 while (*level >= 0) {
3820 WARN_ON(*level < 0);
3821 WARN_ON(*level >= BTRFS_MAX_LEVEL);
3822 cur = path->nodes[*level];
3824 if (btrfs_header_level(cur) != *level)
3827 if (path->slots[*level] >=
3828 btrfs_header_nritems(cur))
3831 /* the new code goes down to level 1 and does all the
3832 * leaves pointed to that node in bulk. So, this check
3833 * for level 0 will always be false.
3835 * But, the disk format allows the drop_snapshot_progress
3836 * field in the root to leave things in a state where
3837 * a leaf will need cleaning up here. If someone crashes
3838 * with the old code and then boots with the new code,
3839 * we might find a leaf here.
3842 ret = btrfs_drop_leaf_ref(trans, root, cur);
3848 * once we get to level one, process the whole node
3849 * at once, including everything below it.
3852 ret = drop_level_one_refs(trans, root, path);
3857 bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
3858 ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
3859 blocksize = btrfs_level_size(root, *level - 1);
3861 ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs);
3865 * if there is more than one reference, we don't need
3866 * to read that node to drop any references it has. We
3867 * just drop the ref we hold on that node and move on to the
3868 * next slot in this level.
3871 parent = path->nodes[*level];
3872 root_owner = btrfs_header_owner(parent);
3873 root_gen = btrfs_header_generation(parent);
3874 path->slots[*level]++;
3876 ret = __btrfs_free_extent(trans, root, bytenr,
3877 blocksize, parent->start,
3878 root_owner, root_gen,
3882 atomic_inc(&root->fs_info->throttle_gen);
3883 wake_up(&root->fs_info->transaction_throttle);
3890 * we need to keep freeing things in the next level down.
3891 * read the block and loop around to process it
3893 next = read_tree_block(root, bytenr, blocksize, ptr_gen);
3894 WARN_ON(*level <= 0);
3895 if (path->nodes[*level-1])
3896 free_extent_buffer(path->nodes[*level-1]);
3897 path->nodes[*level-1] = next;
3898 *level = btrfs_header_level(next);
3899 path->slots[*level] = 0;
3903 WARN_ON(*level < 0);
3904 WARN_ON(*level >= BTRFS_MAX_LEVEL);
3906 if (path->nodes[*level] == root->node) {
3907 parent = path->nodes[*level];
3908 bytenr = path->nodes[*level]->start;
3910 parent = path->nodes[*level + 1];
3911 bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]);
3914 blocksize = btrfs_level_size(root, *level);
3915 root_owner = btrfs_header_owner(parent);
3916 root_gen = btrfs_header_generation(parent);
3919 * cleanup and free the reference on the last node
3922 ret = __btrfs_free_extent(trans, root, bytenr, blocksize,
3923 parent->start, root_owner, root_gen,
3925 free_extent_buffer(path->nodes[*level]);
3926 path->nodes[*level] = NULL;
3936 * helper function for drop_subtree, this function is similar to
3937 * walk_down_tree. The main difference is that it checks reference
3938 * counts while tree blocks are locked.
3940 static noinline int walk_down_subtree(struct btrfs_trans_handle *trans,
3941 struct btrfs_root *root,
3942 struct btrfs_path *path, int *level)
3944 struct extent_buffer *next;
3945 struct extent_buffer *cur;
3946 struct extent_buffer *parent;
3953 cur = path->nodes[*level];
3954 ret = btrfs_lookup_extent_ref(trans, root, cur->start, cur->len,
3960 while (*level >= 0) {
3961 cur = path->nodes[*level];
3963 ret = btrfs_drop_leaf_ref(trans, root, cur);
3965 clean_tree_block(trans, root, cur);
3968 if (path->slots[*level] >= btrfs_header_nritems(cur)) {
3969 clean_tree_block(trans, root, cur);
3973 bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
3974 blocksize = btrfs_level_size(root, *level - 1);
3975 ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
3977 next = read_tree_block(root, bytenr, blocksize, ptr_gen);
3978 btrfs_tree_lock(next);
3979 btrfs_set_lock_blocking(next);
3981 ret = btrfs_lookup_extent_ref(trans, root, bytenr, blocksize,
3985 parent = path->nodes[*level];
3986 ret = btrfs_free_extent(trans, root, bytenr,
3987 blocksize, parent->start,
3988 btrfs_header_owner(parent),
3989 btrfs_header_generation(parent),
3992 path->slots[*level]++;
3993 btrfs_tree_unlock(next);
3994 free_extent_buffer(next);
3998 *level = btrfs_header_level(next);
3999 path->nodes[*level] = next;
4000 path->slots[*level] = 0;
4001 path->locks[*level] = 1;
4005 parent = path->nodes[*level + 1];
4006 bytenr = path->nodes[*level]->start;
4007 blocksize = path->nodes[*level]->len;
4009 ret = btrfs_free_extent(trans, root, bytenr, blocksize,
4010 parent->start, btrfs_header_owner(parent),
4011 btrfs_header_generation(parent), *level, 1);
4014 if (path->locks[*level]) {
4015 btrfs_tree_unlock(path->nodes[*level]);
4016 path->locks[*level] = 0;
4018 free_extent_buffer(path->nodes[*level]);
4019 path->nodes[*level] = NULL;
4026 * helper for dropping snapshots. This walks back up the tree in the path
4027 * to find the first node higher up where we haven't yet gone through
4030 static noinline int walk_up_tree(struct btrfs_trans_handle *trans,
4031 struct btrfs_root *root,
4032 struct btrfs_path *path,
4033 int *level, int max_level)
4037 struct btrfs_root_item *root_item = &root->root_item;
4042 for (i = *level; i < max_level && path->nodes[i]; i++) {
4043 slot = path->slots[i];
4044 if (slot < btrfs_header_nritems(path->nodes[i]) - 1) {
4045 struct extent_buffer *node;
4046 struct btrfs_disk_key disk_key;
4049 * there is more work to do in this level.
4050 * Update the drop_progress marker to reflect
4051 * the work we've done so far, and then bump
4054 node = path->nodes[i];
4057 WARN_ON(*level == 0);
4058 btrfs_node_key(node, &disk_key, path->slots[i]);
4059 memcpy(&root_item->drop_progress,
4060 &disk_key, sizeof(disk_key));
4061 root_item->drop_level = i;
4064 struct extent_buffer *parent;
4067 * this whole node is done, free our reference
4068 * on it and go up one level
4070 if (path->nodes[*level] == root->node)
4071 parent = path->nodes[*level];
4073 parent = path->nodes[*level + 1];
4075 root_owner = btrfs_header_owner(parent);
4076 root_gen = btrfs_header_generation(parent);
4078 clean_tree_block(trans, root, path->nodes[*level]);
4079 ret = btrfs_free_extent(trans, root,
4080 path->nodes[*level]->start,
4081 path->nodes[*level]->len,
4082 parent->start, root_owner,
4083 root_gen, *level, 1);
4085 if (path->locks[*level]) {
4086 btrfs_tree_unlock(path->nodes[*level]);
4087 path->locks[*level] = 0;
4089 free_extent_buffer(path->nodes[*level]);
4090 path->nodes[*level] = NULL;
4098 * drop the reference count on the tree rooted at 'snap'. This traverses
4099 * the tree freeing any blocks that have a ref count of zero after being
4102 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
4108 struct btrfs_path *path;
4111 struct btrfs_root_item *root_item = &root->root_item;
4113 WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex));
4114 path = btrfs_alloc_path();
4117 level = btrfs_header_level(root->node);
4119 if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) {
4120 path->nodes[level] = root->node;
4121 extent_buffer_get(root->node);
4122 path->slots[level] = 0;
4124 struct btrfs_key key;
4125 struct btrfs_disk_key found_key;
4126 struct extent_buffer *node;
4128 btrfs_disk_key_to_cpu(&key, &root_item->drop_progress);
4129 level = root_item->drop_level;
4130 path->lowest_level = level;
4131 wret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
4136 node = path->nodes[level];
4137 btrfs_node_key(node, &found_key, path->slots[level]);
4138 WARN_ON(memcmp(&found_key, &root_item->drop_progress,
4139 sizeof(found_key)));
4141 * unlock our path, this is safe because only this
4142 * function is allowed to delete this snapshot
4144 for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
4145 if (path->nodes[i] && path->locks[i]) {
4147 btrfs_tree_unlock(path->nodes[i]);
4152 wret = walk_down_tree(trans, root, path, &level);
4158 wret = walk_up_tree(trans, root, path, &level,
4164 if (trans->transaction->in_commit) {
4168 atomic_inc(&root->fs_info->throttle_gen);
4169 wake_up(&root->fs_info->transaction_throttle);
4171 for (i = 0; i <= orig_level; i++) {
4172 if (path->nodes[i]) {
4173 free_extent_buffer(path->nodes[i]);
4174 path->nodes[i] = NULL;
4178 btrfs_free_path(path);
4182 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
4183 struct btrfs_root *root,
4184 struct extent_buffer *node,
4185 struct extent_buffer *parent)
4187 struct btrfs_path *path;
4193 path = btrfs_alloc_path();
4196 BUG_ON(!btrfs_tree_locked(parent));
4197 parent_level = btrfs_header_level(parent);
4198 extent_buffer_get(parent);
4199 path->nodes[parent_level] = parent;
4200 path->slots[parent_level] = btrfs_header_nritems(parent);
4202 BUG_ON(!btrfs_tree_locked(node));
4203 level = btrfs_header_level(node);
4204 extent_buffer_get(node);
4205 path->nodes[level] = node;
4206 path->slots[level] = 0;
4209 wret = walk_down_subtree(trans, root, path, &level);
4215 wret = walk_up_tree(trans, root, path, &level, parent_level);
4222 btrfs_free_path(path);
4226 static unsigned long calc_ra(unsigned long start, unsigned long last,
4229 return min(last, start + nr - 1);
4232 static noinline int relocate_inode_pages(struct inode *inode, u64 start,
4237 unsigned long first_index;
4238 unsigned long last_index;
4241 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
4242 struct file_ra_state *ra;
4243 struct btrfs_ordered_extent *ordered;
4244 unsigned int total_read = 0;
4245 unsigned int total_dirty = 0;
4248 ra = kzalloc(sizeof(*ra), GFP_NOFS);
4250 mutex_lock(&inode->i_mutex);
4251 first_index = start >> PAGE_CACHE_SHIFT;
4252 last_index = (start + len - 1) >> PAGE_CACHE_SHIFT;
4254 /* make sure the dirty trick played by the caller work */
4255 ret = invalidate_inode_pages2_range(inode->i_mapping,
4256 first_index, last_index);
4260 file_ra_state_init(ra, inode->i_mapping);
4262 for (i = first_index ; i <= last_index; i++) {
4263 if (total_read % ra->ra_pages == 0) {
4264 btrfs_force_ra(inode->i_mapping, ra, NULL, i,
4265 calc_ra(i, last_index, ra->ra_pages));
4269 if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode))
4271 page = grab_cache_page(inode->i_mapping, i);
4276 if (!PageUptodate(page)) {
4277 btrfs_readpage(NULL, page);
4279 if (!PageUptodate(page)) {
4281 page_cache_release(page);
4286 wait_on_page_writeback(page);
4288 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
4289 page_end = page_start + PAGE_CACHE_SIZE - 1;
4290 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
4292 ordered = btrfs_lookup_ordered_extent(inode, page_start);
4294 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
4296 page_cache_release(page);
4297 btrfs_start_ordered_extent(inode, ordered, 1);
4298 btrfs_put_ordered_extent(ordered);
4301 set_page_extent_mapped(page);
4303 if (i == first_index)
4304 set_extent_bits(io_tree, page_start, page_end,
4305 EXTENT_BOUNDARY, GFP_NOFS);
4306 btrfs_set_extent_delalloc(inode, page_start, page_end);
4308 set_page_dirty(page);
4311 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
4313 page_cache_release(page);
4318 mutex_unlock(&inode->i_mutex);
4319 balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty);
4323 static noinline int relocate_data_extent(struct inode *reloc_inode,
4324 struct btrfs_key *extent_key,
4327 struct btrfs_root *root = BTRFS_I(reloc_inode)->root;
4328 struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree;
4329 struct extent_map *em;
4330 u64 start = extent_key->objectid - offset;
4331 u64 end = start + extent_key->offset - 1;
4333 em = alloc_extent_map(GFP_NOFS);
4334 BUG_ON(!em || IS_ERR(em));
4337 em->len = extent_key->offset;
4338 em->block_len = extent_key->offset;
4339 em->block_start = extent_key->objectid;
4340 em->bdev = root->fs_info->fs_devices->latest_bdev;
4341 set_bit(EXTENT_FLAG_PINNED, &em->flags);
4343 /* setup extent map to cheat btrfs_readpage */
4344 lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS);
4347 spin_lock(&em_tree->lock);
4348 ret = add_extent_mapping(em_tree, em);
4349 spin_unlock(&em_tree->lock);
4350 if (ret != -EEXIST) {
4351 free_extent_map(em);
4354 btrfs_drop_extent_cache(reloc_inode, start, end, 0);
4356 unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS);
4358 return relocate_inode_pages(reloc_inode, start, extent_key->offset);
4361 struct btrfs_ref_path {
4363 u64 nodes[BTRFS_MAX_LEVEL];
4365 u64 root_generation;
4372 struct btrfs_key node_keys[BTRFS_MAX_LEVEL];
4373 u64 new_nodes[BTRFS_MAX_LEVEL];
4376 struct disk_extent {
4387 static int is_cowonly_root(u64 root_objectid)
4389 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID ||
4390 root_objectid == BTRFS_EXTENT_TREE_OBJECTID ||
4391 root_objectid == BTRFS_CHUNK_TREE_OBJECTID ||
4392 root_objectid == BTRFS_DEV_TREE_OBJECTID ||
4393 root_objectid == BTRFS_TREE_LOG_OBJECTID ||
4394 root_objectid == BTRFS_CSUM_TREE_OBJECTID)
4399 static noinline int __next_ref_path(struct btrfs_trans_handle *trans,
4400 struct btrfs_root *extent_root,
4401 struct btrfs_ref_path *ref_path,
4404 struct extent_buffer *leaf;
4405 struct btrfs_path *path;
4406 struct btrfs_extent_ref *ref;
4407 struct btrfs_key key;
4408 struct btrfs_key found_key;
4414 path = btrfs_alloc_path();
4419 ref_path->lowest_level = -1;
4420 ref_path->current_level = -1;
4421 ref_path->shared_level = -1;
4425 level = ref_path->current_level - 1;
4426 while (level >= -1) {
4428 if (level < ref_path->lowest_level)
4432 bytenr = ref_path->nodes[level];
4434 bytenr = ref_path->extent_start;
4435 BUG_ON(bytenr == 0);
4437 parent = ref_path->nodes[level + 1];
4438 ref_path->nodes[level + 1] = 0;
4439 ref_path->current_level = level;
4440 BUG_ON(parent == 0);
4442 key.objectid = bytenr;
4443 key.offset = parent + 1;
4444 key.type = BTRFS_EXTENT_REF_KEY;
4446 ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0);
4451 leaf = path->nodes[0];
4452 nritems = btrfs_header_nritems(leaf);
4453 if (path->slots[0] >= nritems) {
4454 ret = btrfs_next_leaf(extent_root, path);
4459 leaf = path->nodes[0];
4462 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
4463 if (found_key.objectid == bytenr &&
4464 found_key.type == BTRFS_EXTENT_REF_KEY) {
4465 if (level < ref_path->shared_level)
4466 ref_path->shared_level = level;
4471 btrfs_release_path(extent_root, path);
4474 /* reached lowest level */
4478 level = ref_path->current_level;
4479 while (level < BTRFS_MAX_LEVEL - 1) {
4483 bytenr = ref_path->nodes[level];
4485 bytenr = ref_path->extent_start;
4487 BUG_ON(bytenr == 0);
4489 key.objectid = bytenr;
4491 key.type = BTRFS_EXTENT_REF_KEY;
4493 ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0);
4497 leaf = path->nodes[0];
4498 nritems = btrfs_header_nritems(leaf);
4499 if (path->slots[0] >= nritems) {
4500 ret = btrfs_next_leaf(extent_root, path);
4504 /* the extent was freed by someone */
4505 if (ref_path->lowest_level == level)
4507 btrfs_release_path(extent_root, path);
4510 leaf = path->nodes[0];
4513 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
4514 if (found_key.objectid != bytenr ||
4515 found_key.type != BTRFS_EXTENT_REF_KEY) {
4516 /* the extent was freed by someone */
4517 if (ref_path->lowest_level == level) {
4521 btrfs_release_path(extent_root, path);
4525 ref = btrfs_item_ptr(leaf, path->slots[0],
4526 struct btrfs_extent_ref);
4527 ref_objectid = btrfs_ref_objectid(leaf, ref);
4528 if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) {
4530 level = (int)ref_objectid;
4531 BUG_ON(level >= BTRFS_MAX_LEVEL);
4532 ref_path->lowest_level = level;
4533 ref_path->current_level = level;
4534 ref_path->nodes[level] = bytenr;
4536 WARN_ON(ref_objectid != level);
4539 WARN_ON(level != -1);
4543 if (ref_path->lowest_level == level) {
4544 ref_path->owner_objectid = ref_objectid;
4545 ref_path->num_refs = btrfs_ref_num_refs(leaf, ref);
4549 * the block is tree root or the block isn't in reference
4552 if (found_key.objectid == found_key.offset ||
4553 is_cowonly_root(btrfs_ref_root(leaf, ref))) {
4554 ref_path->root_objectid = btrfs_ref_root(leaf, ref);
4555 ref_path->root_generation =
4556 btrfs_ref_generation(leaf, ref);
4558 /* special reference from the tree log */
4559 ref_path->nodes[0] = found_key.offset;
4560 ref_path->current_level = 0;
4567 BUG_ON(ref_path->nodes[level] != 0);
4568 ref_path->nodes[level] = found_key.offset;
4569 ref_path->current_level = level;
4572 * the reference was created in the running transaction,
4573 * no need to continue walking up.
4575 if (btrfs_ref_generation(leaf, ref) == trans->transid) {
4576 ref_path->root_objectid = btrfs_ref_root(leaf, ref);
4577 ref_path->root_generation =
4578 btrfs_ref_generation(leaf, ref);
4583 btrfs_release_path(extent_root, path);
4586 /* reached max tree level, but no tree root found. */
4589 btrfs_free_path(path);
4593 static int btrfs_first_ref_path(struct btrfs_trans_handle *trans,
4594 struct btrfs_root *extent_root,
4595 struct btrfs_ref_path *ref_path,
4598 memset(ref_path, 0, sizeof(*ref_path));
4599 ref_path->extent_start = extent_start;
4601 return __next_ref_path(trans, extent_root, ref_path, 1);
4604 static int btrfs_next_ref_path(struct btrfs_trans_handle *trans,
4605 struct btrfs_root *extent_root,
4606 struct btrfs_ref_path *ref_path)
4608 return __next_ref_path(trans, extent_root, ref_path, 0);
4611 static noinline int get_new_locations(struct inode *reloc_inode,
4612 struct btrfs_key *extent_key,
4613 u64 offset, int no_fragment,
4614 struct disk_extent **extents,
4617 struct btrfs_root *root = BTRFS_I(reloc_inode)->root;
4618 struct btrfs_path *path;
4619 struct btrfs_file_extent_item *fi;
4620 struct extent_buffer *leaf;
4621 struct disk_extent *exts = *extents;
4622 struct btrfs_key found_key;
4627 int max = *nr_extents;
4630 WARN_ON(!no_fragment && *extents);
4633 exts = kmalloc(sizeof(*exts) * max, GFP_NOFS);
4638 path = btrfs_alloc_path();
4641 cur_pos = extent_key->objectid - offset;
4642 last_byte = extent_key->objectid + extent_key->offset;
4643 ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino,
4653 leaf = path->nodes[0];
4654 nritems = btrfs_header_nritems(leaf);
4655 if (path->slots[0] >= nritems) {
4656 ret = btrfs_next_leaf(root, path);
4661 leaf = path->nodes[0];
4664 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
4665 if (found_key.offset != cur_pos ||
4666 found_key.type != BTRFS_EXTENT_DATA_KEY ||
4667 found_key.objectid != reloc_inode->i_ino)
4670 fi = btrfs_item_ptr(leaf, path->slots[0],
4671 struct btrfs_file_extent_item);
4672 if (btrfs_file_extent_type(leaf, fi) !=
4673 BTRFS_FILE_EXTENT_REG ||
4674 btrfs_file_extent_disk_bytenr(leaf, fi) == 0)
4678 struct disk_extent *old = exts;
4680 exts = kzalloc(sizeof(*exts) * max, GFP_NOFS);
4681 memcpy(exts, old, sizeof(*exts) * nr);
4682 if (old != *extents)
4686 exts[nr].disk_bytenr =
4687 btrfs_file_extent_disk_bytenr(leaf, fi);
4688 exts[nr].disk_num_bytes =
4689 btrfs_file_extent_disk_num_bytes(leaf, fi);
4690 exts[nr].offset = btrfs_file_extent_offset(leaf, fi);
4691 exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
4692 exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
4693 exts[nr].compression = btrfs_file_extent_compression(leaf, fi);
4694 exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi);
4695 exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf,
4697 BUG_ON(exts[nr].offset > 0);
4698 BUG_ON(exts[nr].compression || exts[nr].encryption);
4699 BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes);
4701 cur_pos += exts[nr].num_bytes;
4704 if (cur_pos + offset >= last_byte)
4714 BUG_ON(cur_pos + offset > last_byte);
4715 if (cur_pos + offset < last_byte) {
4721 btrfs_free_path(path);
4723 if (exts != *extents)
4732 static noinline int replace_one_extent(struct btrfs_trans_handle *trans,
4733 struct btrfs_root *root,
4734 struct btrfs_path *path,
4735 struct btrfs_key *extent_key,
4736 struct btrfs_key *leaf_key,
4737 struct btrfs_ref_path *ref_path,
4738 struct disk_extent *new_extents,
4741 struct extent_buffer *leaf;
4742 struct btrfs_file_extent_item *fi;
4743 struct inode *inode = NULL;
4744 struct btrfs_key key;
4749 u64 search_end = (u64)-1;
4752 int extent_locked = 0;
4756 memcpy(&key, leaf_key, sizeof(key));
4757 if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) {
4758 if (key.objectid < ref_path->owner_objectid ||
4759 (key.objectid == ref_path->owner_objectid &&
4760 key.type < BTRFS_EXTENT_DATA_KEY)) {
4761 key.objectid = ref_path->owner_objectid;
4762 key.type = BTRFS_EXTENT_DATA_KEY;
4768 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
4772 leaf = path->nodes[0];
4773 nritems = btrfs_header_nritems(leaf);
4775 if (extent_locked && ret > 0) {
4777 * the file extent item was modified by someone
4778 * before the extent got locked.
4780 unlock_extent(&BTRFS_I(inode)->io_tree, lock_start,
4781 lock_end, GFP_NOFS);
4785 if (path->slots[0] >= nritems) {
4786 if (++nr_scaned > 2)
4789 BUG_ON(extent_locked);
4790 ret = btrfs_next_leaf(root, path);
4795 leaf = path->nodes[0];
4796 nritems = btrfs_header_nritems(leaf);
4799 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
4801 if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) {
4802 if ((key.objectid > ref_path->owner_objectid) ||
4803 (key.objectid == ref_path->owner_objectid &&
4804 key.type > BTRFS_EXTENT_DATA_KEY) ||
4805 key.offset >= search_end)
4809 if (inode && key.objectid != inode->i_ino) {
4810 BUG_ON(extent_locked);
4811 btrfs_release_path(root, path);
4812 mutex_unlock(&inode->i_mutex);
4818 if (key.type != BTRFS_EXTENT_DATA_KEY) {
4823 fi = btrfs_item_ptr(leaf, path->slots[0],
4824 struct btrfs_file_extent_item);
4825 extent_type = btrfs_file_extent_type(leaf, fi);
4826 if ((extent_type != BTRFS_FILE_EXTENT_REG &&
4827 extent_type != BTRFS_FILE_EXTENT_PREALLOC) ||
4828 (btrfs_file_extent_disk_bytenr(leaf, fi) !=
4829 extent_key->objectid)) {
4835 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
4836 ext_offset = btrfs_file_extent_offset(leaf, fi);
4838 if (search_end == (u64)-1) {
4839 search_end = key.offset - ext_offset +
4840 btrfs_file_extent_ram_bytes(leaf, fi);
4843 if (!extent_locked) {
4844 lock_start = key.offset;
4845 lock_end = lock_start + num_bytes - 1;
4847 if (lock_start > key.offset ||
4848 lock_end + 1 < key.offset + num_bytes) {
4849 unlock_extent(&BTRFS_I(inode)->io_tree,
4850 lock_start, lock_end, GFP_NOFS);
4856 btrfs_release_path(root, path);
4858 inode = btrfs_iget_locked(root->fs_info->sb,
4859 key.objectid, root);
4860 if (inode->i_state & I_NEW) {
4861 BTRFS_I(inode)->root = root;
4862 BTRFS_I(inode)->location.objectid =
4864 BTRFS_I(inode)->location.type =
4865 BTRFS_INODE_ITEM_KEY;
4866 BTRFS_I(inode)->location.offset = 0;
4867 btrfs_read_locked_inode(inode);
4868 unlock_new_inode(inode);
4871 * some code call btrfs_commit_transaction while
4872 * holding the i_mutex, so we can't use mutex_lock
4875 if (is_bad_inode(inode) ||
4876 !mutex_trylock(&inode->i_mutex)) {
4879 key.offset = (u64)-1;
4884 if (!extent_locked) {
4885 struct btrfs_ordered_extent *ordered;
4887 btrfs_release_path(root, path);
4889 lock_extent(&BTRFS_I(inode)->io_tree, lock_start,
4890 lock_end, GFP_NOFS);
4891 ordered = btrfs_lookup_first_ordered_extent(inode,
4894 ordered->file_offset <= lock_end &&
4895 ordered->file_offset + ordered->len > lock_start) {
4896 unlock_extent(&BTRFS_I(inode)->io_tree,
4897 lock_start, lock_end, GFP_NOFS);
4898 btrfs_start_ordered_extent(inode, ordered, 1);
4899 btrfs_put_ordered_extent(ordered);
4900 key.offset += num_bytes;
4904 btrfs_put_ordered_extent(ordered);
4910 if (nr_extents == 1) {
4911 /* update extent pointer in place */
4912 btrfs_set_file_extent_disk_bytenr(leaf, fi,
4913 new_extents[0].disk_bytenr);
4914 btrfs_set_file_extent_disk_num_bytes(leaf, fi,
4915 new_extents[0].disk_num_bytes);
4916 btrfs_mark_buffer_dirty(leaf);
4918 btrfs_drop_extent_cache(inode, key.offset,
4919 key.offset + num_bytes - 1, 0);
4921 ret = btrfs_inc_extent_ref(trans, root,
4922 new_extents[0].disk_bytenr,
4923 new_extents[0].disk_num_bytes,
4925 root->root_key.objectid,
4930 ret = btrfs_free_extent(trans, root,
4931 extent_key->objectid,
4934 btrfs_header_owner(leaf),
4935 btrfs_header_generation(leaf),
4939 btrfs_release_path(root, path);
4940 key.offset += num_bytes;
4948 * drop old extent pointer at first, then insert the
4949 * new pointers one bye one
4951 btrfs_release_path(root, path);
4952 ret = btrfs_drop_extents(trans, root, inode, key.offset,
4953 key.offset + num_bytes,
4954 key.offset, &alloc_hint);
4957 for (i = 0; i < nr_extents; i++) {
4958 if (ext_offset >= new_extents[i].num_bytes) {
4959 ext_offset -= new_extents[i].num_bytes;
4962 extent_len = min(new_extents[i].num_bytes -
4963 ext_offset, num_bytes);
4965 ret = btrfs_insert_empty_item(trans, root,
4970 leaf = path->nodes[0];
4971 fi = btrfs_item_ptr(leaf, path->slots[0],
4972 struct btrfs_file_extent_item);
4973 btrfs_set_file_extent_generation(leaf, fi,
4975 btrfs_set_file_extent_type(leaf, fi,
4976 BTRFS_FILE_EXTENT_REG);
4977 btrfs_set_file_extent_disk_bytenr(leaf, fi,
4978 new_extents[i].disk_bytenr);
4979 btrfs_set_file_extent_disk_num_bytes(leaf, fi,
4980 new_extents[i].disk_num_bytes);
4981 btrfs_set_file_extent_ram_bytes(leaf, fi,
4982 new_extents[i].ram_bytes);
4984 btrfs_set_file_extent_compression(leaf, fi,
4985 new_extents[i].compression);
4986 btrfs_set_file_extent_encryption(leaf, fi,
4987 new_extents[i].encryption);
4988 btrfs_set_file_extent_other_encoding(leaf, fi,
4989 new_extents[i].other_encoding);
4991 btrfs_set_file_extent_num_bytes(leaf, fi,
4993 ext_offset += new_extents[i].offset;
4994 btrfs_set_file_extent_offset(leaf, fi,
4996 btrfs_mark_buffer_dirty(leaf);
4998 btrfs_drop_extent_cache(inode, key.offset,
4999 key.offset + extent_len - 1, 0);
5001 ret = btrfs_inc_extent_ref(trans, root,
5002 new_extents[i].disk_bytenr,
5003 new_extents[i].disk_num_bytes,
5005 root->root_key.objectid,
5006 trans->transid, key.objectid);
5008 btrfs_release_path(root, path);
5010 inode_add_bytes(inode, extent_len);
5013 num_bytes -= extent_len;
5014 key.offset += extent_len;
5019 BUG_ON(i >= nr_extents);
5023 if (extent_locked) {
5024 unlock_extent(&BTRFS_I(inode)->io_tree, lock_start,
5025 lock_end, GFP_NOFS);
5029 if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS &&
5030 key.offset >= search_end)
5037 btrfs_release_path(root, path);
5039 mutex_unlock(&inode->i_mutex);
5040 if (extent_locked) {
5041 unlock_extent(&BTRFS_I(inode)->io_tree, lock_start,
5042 lock_end, GFP_NOFS);
5049 int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans,
5050 struct btrfs_root *root,
5051 struct extent_buffer *buf, u64 orig_start)
5056 BUG_ON(btrfs_header_generation(buf) != trans->transid);
5057 BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID);
5059 level = btrfs_header_level(buf);
5061 struct btrfs_leaf_ref *ref;
5062 struct btrfs_leaf_ref *orig_ref;
5064 orig_ref = btrfs_lookup_leaf_ref(root, orig_start);
5068 ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems);
5070 btrfs_free_leaf_ref(root, orig_ref);
5074 ref->nritems = orig_ref->nritems;
5075 memcpy(ref->extents, orig_ref->extents,
5076 sizeof(ref->extents[0]) * ref->nritems);
5078 btrfs_free_leaf_ref(root, orig_ref);
5080 ref->root_gen = trans->transid;
5081 ref->bytenr = buf->start;
5082 ref->owner = btrfs_header_owner(buf);
5083 ref->generation = btrfs_header_generation(buf);
5085 ret = btrfs_add_leaf_ref(root, ref, 0);
5087 btrfs_free_leaf_ref(root, ref);
5092 static noinline int invalidate_extent_cache(struct btrfs_root *root,
5093 struct extent_buffer *leaf,
5094 struct btrfs_block_group_cache *group,
5095 struct btrfs_root *target_root)
5097 struct btrfs_key key;
5098 struct inode *inode = NULL;
5099 struct btrfs_file_extent_item *fi;
5101 u64 skip_objectid = 0;
5105 nritems = btrfs_header_nritems(leaf);
5106 for (i = 0; i < nritems; i++) {
5107 btrfs_item_key_to_cpu(leaf, &key, i);
5108 if (key.objectid == skip_objectid ||
5109 key.type != BTRFS_EXTENT_DATA_KEY)
5111 fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
5112 if (btrfs_file_extent_type(leaf, fi) ==
5113 BTRFS_FILE_EXTENT_INLINE)
5115 if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0)
5117 if (!inode || inode->i_ino != key.objectid) {
5119 inode = btrfs_ilookup(target_root->fs_info->sb,
5120 key.objectid, target_root, 1);
5123 skip_objectid = key.objectid;
5126 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
5128 lock_extent(&BTRFS_I(inode)->io_tree, key.offset,
5129 key.offset + num_bytes - 1, GFP_NOFS);
5130 btrfs_drop_extent_cache(inode, key.offset,
5131 key.offset + num_bytes - 1, 1);
5132 unlock_extent(&BTRFS_I(inode)->io_tree, key.offset,
5133 key.offset + num_bytes - 1, GFP_NOFS);
5140 static noinline int replace_extents_in_leaf(struct btrfs_trans_handle *trans,
5141 struct btrfs_root *root,
5142 struct extent_buffer *leaf,
5143 struct btrfs_block_group_cache *group,
5144 struct inode *reloc_inode)
5146 struct btrfs_key key;
5147 struct btrfs_key extent_key;
5148 struct btrfs_file_extent_item *fi;
5149 struct btrfs_leaf_ref *ref;
5150 struct disk_extent *new_extent;
5159 new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS);
5160 BUG_ON(!new_extent);
5162 ref = btrfs_lookup_leaf_ref(root, leaf->start);
5166 nritems = btrfs_header_nritems(leaf);
5167 for (i = 0; i < nritems; i++) {
5168 btrfs_item_key_to_cpu(leaf, &key, i);
5169 if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
5171 fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
5172 if (btrfs_file_extent_type(leaf, fi) ==
5173 BTRFS_FILE_EXTENT_INLINE)
5175 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
5176 num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
5181 if (bytenr >= group->key.objectid + group->key.offset ||
5182 bytenr + num_bytes <= group->key.objectid)
5185 extent_key.objectid = bytenr;
5186 extent_key.offset = num_bytes;
5187 extent_key.type = BTRFS_EXTENT_ITEM_KEY;
5189 ret = get_new_locations(reloc_inode, &extent_key,
5190 group->key.objectid, 1,
5191 &new_extent, &nr_extent);
5196 BUG_ON(ref->extents[ext_index].bytenr != bytenr);
5197 BUG_ON(ref->extents[ext_index].num_bytes != num_bytes);
5198 ref->extents[ext_index].bytenr = new_extent->disk_bytenr;
5199 ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes;
5201 btrfs_set_file_extent_disk_bytenr(leaf, fi,
5202 new_extent->disk_bytenr);
5203 btrfs_set_file_extent_disk_num_bytes(leaf, fi,
5204 new_extent->disk_num_bytes);
5205 btrfs_mark_buffer_dirty(leaf);
5207 ret = btrfs_inc_extent_ref(trans, root,
5208 new_extent->disk_bytenr,
5209 new_extent->disk_num_bytes,
5211 root->root_key.objectid,
5212 trans->transid, key.objectid);
5214 ret = btrfs_free_extent(trans, root,
5215 bytenr, num_bytes, leaf->start,
5216 btrfs_header_owner(leaf),
5217 btrfs_header_generation(leaf),
5223 BUG_ON(ext_index + 1 != ref->nritems);
5224 btrfs_free_leaf_ref(root, ref);
5228 int btrfs_free_reloc_root(struct btrfs_trans_handle *trans,
5229 struct btrfs_root *root)
5231 struct btrfs_root *reloc_root;
5234 if (root->reloc_root) {
5235 reloc_root = root->reloc_root;
5236 root->reloc_root = NULL;
5237 list_add(&reloc_root->dead_list,
5238 &root->fs_info->dead_reloc_roots);
5240 btrfs_set_root_bytenr(&reloc_root->root_item,
5241 reloc_root->node->start);
5242 btrfs_set_root_level(&root->root_item,
5243 btrfs_header_level(reloc_root->node));
5244 memset(&reloc_root->root_item.drop_progress, 0,
5245 sizeof(struct btrfs_disk_key));
5246 reloc_root->root_item.drop_level = 0;
5248 ret = btrfs_update_root(trans, root->fs_info->tree_root,
5249 &reloc_root->root_key,
5250 &reloc_root->root_item);
5256 int btrfs_drop_dead_reloc_roots(struct btrfs_root *root)
5258 struct btrfs_trans_handle *trans;
5259 struct btrfs_root *reloc_root;
5260 struct btrfs_root *prev_root = NULL;
5261 struct list_head dead_roots;
5265 INIT_LIST_HEAD(&dead_roots);
5266 list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots);
5268 while (!list_empty(&dead_roots)) {
5269 reloc_root = list_entry(dead_roots.prev,
5270 struct btrfs_root, dead_list);
5271 list_del_init(&reloc_root->dead_list);
5273 BUG_ON(reloc_root->commit_root != NULL);
5275 trans = btrfs_join_transaction(root, 1);
5278 mutex_lock(&root->fs_info->drop_mutex);
5279 ret = btrfs_drop_snapshot(trans, reloc_root);
5282 mutex_unlock(&root->fs_info->drop_mutex);
5284 nr = trans->blocks_used;
5285 ret = btrfs_end_transaction(trans, root);
5287 btrfs_btree_balance_dirty(root, nr);
5290 free_extent_buffer(reloc_root->node);
5292 ret = btrfs_del_root(trans, root->fs_info->tree_root,
5293 &reloc_root->root_key);
5295 mutex_unlock(&root->fs_info->drop_mutex);
5297 nr = trans->blocks_used;
5298 ret = btrfs_end_transaction(trans, root);
5300 btrfs_btree_balance_dirty(root, nr);
5303 prev_root = reloc_root;
5306 btrfs_remove_leaf_refs(prev_root, (u64)-1, 0);
5312 int btrfs_add_dead_reloc_root(struct btrfs_root *root)
5314 list_add(&root->dead_list, &root->fs_info->dead_reloc_roots);
5318 int btrfs_cleanup_reloc_trees(struct btrfs_root *root)
5320 struct btrfs_root *reloc_root;
5321 struct btrfs_trans_handle *trans;
5322 struct btrfs_key location;
5326 mutex_lock(&root->fs_info->tree_reloc_mutex);
5327 ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL);
5329 found = !list_empty(&root->fs_info->dead_reloc_roots);
5330 mutex_unlock(&root->fs_info->tree_reloc_mutex);
5333 trans = btrfs_start_transaction(root, 1);
5335 ret = btrfs_commit_transaction(trans, root);
5339 location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
5340 location.offset = (u64)-1;
5341 location.type = BTRFS_ROOT_ITEM_KEY;
5343 reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
5344 BUG_ON(!reloc_root);
5345 btrfs_orphan_cleanup(reloc_root);
5349 static noinline int init_reloc_tree(struct btrfs_trans_handle *trans,
5350 struct btrfs_root *root)
5352 struct btrfs_root *reloc_root;
5353 struct extent_buffer *eb;
5354 struct btrfs_root_item *root_item;
5355 struct btrfs_key root_key;
5358 BUG_ON(!root->ref_cows);
5359 if (root->reloc_root)
5362 root_item = kmalloc(sizeof(*root_item), GFP_NOFS);
5365 ret = btrfs_copy_root(trans, root, root->commit_root,
5366 &eb, BTRFS_TREE_RELOC_OBJECTID);
5369 root_key.objectid = BTRFS_TREE_RELOC_OBJECTID;
5370 root_key.offset = root->root_key.objectid;
5371 root_key.type = BTRFS_ROOT_ITEM_KEY;
5373 memcpy(root_item, &root->root_item, sizeof(root_item));
5374 btrfs_set_root_refs(root_item, 0);
5375 btrfs_set_root_bytenr(root_item, eb->start);
5376 btrfs_set_root_level(root_item, btrfs_header_level(eb));
5377 btrfs_set_root_generation(root_item, trans->transid);
5379 btrfs_tree_unlock(eb);
5380 free_extent_buffer(eb);
5382 ret = btrfs_insert_root(trans, root->fs_info->tree_root,
5383 &root_key, root_item);
5387 reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root,
5389 BUG_ON(!reloc_root);
5390 reloc_root->last_trans = trans->transid;
5391 reloc_root->commit_root = NULL;
5392 reloc_root->ref_tree = &root->fs_info->reloc_ref_tree;
5394 root->reloc_root = reloc_root;
5399 * Core function of space balance.
5401 * The idea is using reloc trees to relocate tree blocks in reference
5402 * counted roots. There is one reloc tree for each subvol, and all
5403 * reloc trees share same root key objectid. Reloc trees are snapshots
5404 * of the latest committed roots of subvols (root->commit_root).
5406 * To relocate a tree block referenced by a subvol, there are two steps.
5407 * COW the block through subvol's reloc tree, then update block pointer
5408 * in the subvol to point to the new block. Since all reloc trees share
5409 * same root key objectid, doing special handing for tree blocks owned
5410 * by them is easy. Once a tree block has been COWed in one reloc tree,
5411 * we can use the resulting new block directly when the same block is
5412 * required to COW again through other reloc trees. By this way, relocated
5413 * tree blocks are shared between reloc trees, so they are also shared
5416 static noinline int relocate_one_path(struct btrfs_trans_handle *trans,
5417 struct btrfs_root *root,
5418 struct btrfs_path *path,
5419 struct btrfs_key *first_key,
5420 struct btrfs_ref_path *ref_path,
5421 struct btrfs_block_group_cache *group,
5422 struct inode *reloc_inode)
5424 struct btrfs_root *reloc_root;
5425 struct extent_buffer *eb = NULL;
5426 struct btrfs_key *keys;
5430 int lowest_level = 0;
5433 if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
5434 lowest_level = ref_path->owner_objectid;
5436 if (!root->ref_cows) {
5437 path->lowest_level = lowest_level;
5438 ret = btrfs_search_slot(trans, root, first_key, path, 0, 1);
5440 path->lowest_level = 0;
5441 btrfs_release_path(root, path);
5445 mutex_lock(&root->fs_info->tree_reloc_mutex);
5446 ret = init_reloc_tree(trans, root);
5448 reloc_root = root->reloc_root;
5450 shared_level = ref_path->shared_level;
5451 ref_path->shared_level = BTRFS_MAX_LEVEL - 1;
5453 keys = ref_path->node_keys;
5454 nodes = ref_path->new_nodes;
5455 memset(&keys[shared_level + 1], 0,
5456 sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1));
5457 memset(&nodes[shared_level + 1], 0,
5458 sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1));
5460 if (nodes[lowest_level] == 0) {
5461 path->lowest_level = lowest_level;
5462 ret = btrfs_search_slot(trans, reloc_root, first_key, path,
5465 for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) {
5466 eb = path->nodes[level];
5467 if (!eb || eb == reloc_root->node)
5469 nodes[level] = eb->start;
5471 btrfs_item_key_to_cpu(eb, &keys[level], 0);
5473 btrfs_node_key_to_cpu(eb, &keys[level], 0);
5476 ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
5477 eb = path->nodes[0];
5478 ret = replace_extents_in_leaf(trans, reloc_root, eb,
5479 group, reloc_inode);
5482 btrfs_release_path(reloc_root, path);
5484 ret = btrfs_merge_path(trans, reloc_root, keys, nodes,
5490 * replace tree blocks in the fs tree with tree blocks in
5493 ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level);
5496 if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
5497 ret = btrfs_search_slot(trans, reloc_root, first_key, path,
5500 extent_buffer_get(path->nodes[0]);
5501 eb = path->nodes[0];
5502 btrfs_release_path(reloc_root, path);
5503 ret = invalidate_extent_cache(reloc_root, eb, group, root);
5505 free_extent_buffer(eb);
5508 mutex_unlock(&root->fs_info->tree_reloc_mutex);
5509 path->lowest_level = 0;
5513 static noinline int relocate_tree_block(struct btrfs_trans_handle *trans,
5514 struct btrfs_root *root,
5515 struct btrfs_path *path,
5516 struct btrfs_key *first_key,
5517 struct btrfs_ref_path *ref_path)
5521 ret = relocate_one_path(trans, root, path, first_key,
5522 ref_path, NULL, NULL);
5525 if (root == root->fs_info->extent_root)
5526 btrfs_extent_post_op(trans, root);
5531 static noinline int del_extent_zero(struct btrfs_trans_handle *trans,
5532 struct btrfs_root *extent_root,
5533 struct btrfs_path *path,
5534 struct btrfs_key *extent_key)
5538 ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1);
5541 ret = btrfs_del_item(trans, extent_root, path);
5543 btrfs_release_path(extent_root, path);
5547 static noinline struct btrfs_root *read_ref_root(struct btrfs_fs_info *fs_info,
5548 struct btrfs_ref_path *ref_path)
5550 struct btrfs_key root_key;
5552 root_key.objectid = ref_path->root_objectid;
5553 root_key.type = BTRFS_ROOT_ITEM_KEY;
5554 if (is_cowonly_root(ref_path->root_objectid))
5555 root_key.offset = 0;
5557 root_key.offset = (u64)-1;
5559 return btrfs_read_fs_root_no_name(fs_info, &root_key);
5562 static noinline int relocate_one_extent(struct btrfs_root *extent_root,
5563 struct btrfs_path *path,
5564 struct btrfs_key *extent_key,
5565 struct btrfs_block_group_cache *group,
5566 struct inode *reloc_inode, int pass)
5568 struct btrfs_trans_handle *trans;
5569 struct btrfs_root *found_root;
5570 struct btrfs_ref_path *ref_path = NULL;
5571 struct disk_extent *new_extents = NULL;
5576 struct btrfs_key first_key;
5580 trans = btrfs_start_transaction(extent_root, 1);
5583 if (extent_key->objectid == 0) {
5584 ret = del_extent_zero(trans, extent_root, path, extent_key);
5588 ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS);
5594 for (loops = 0; ; loops++) {
5596 ret = btrfs_first_ref_path(trans, extent_root, ref_path,
5597 extent_key->objectid);
5599 ret = btrfs_next_ref_path(trans, extent_root, ref_path);
5606 if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID ||
5607 ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID)
5610 found_root = read_ref_root(extent_root->fs_info, ref_path);
5611 BUG_ON(!found_root);
5613 * for reference counted tree, only process reference paths
5614 * rooted at the latest committed root.
5616 if (found_root->ref_cows &&
5617 ref_path->root_generation != found_root->root_key.offset)
5620 if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
5623 * copy data extents to new locations
5625 u64 group_start = group->key.objectid;
5626 ret = relocate_data_extent(reloc_inode,
5635 level = ref_path->owner_objectid;
5638 if (prev_block != ref_path->nodes[level]) {
5639 struct extent_buffer *eb;
5640 u64 block_start = ref_path->nodes[level];
5641 u64 block_size = btrfs_level_size(found_root, level);
5643 eb = read_tree_block(found_root, block_start,
5645 btrfs_tree_lock(eb);
5646 BUG_ON(level != btrfs_header_level(eb));
5649 btrfs_item_key_to_cpu(eb, &first_key, 0);
5651 btrfs_node_key_to_cpu(eb, &first_key, 0);
5653 btrfs_tree_unlock(eb);
5654 free_extent_buffer(eb);
5655 prev_block = block_start;
5658 btrfs_record_root_in_trans(found_root);
5659 if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
5661 * try to update data extent references while
5662 * keeping metadata shared between snapshots.
5665 ret = relocate_one_path(trans, found_root,
5666 path, &first_key, ref_path,
5667 group, reloc_inode);
5673 * use fallback method to process the remaining
5677 u64 group_start = group->key.objectid;
5678 new_extents = kmalloc(sizeof(*new_extents),
5681 ret = get_new_locations(reloc_inode,
5689 ret = replace_one_extent(trans, found_root,
5691 &first_key, ref_path,
5692 new_extents, nr_extents);
5694 ret = relocate_tree_block(trans, found_root, path,
5695 &first_key, ref_path);
5702 btrfs_end_transaction(trans, extent_root);
5708 static u64 update_block_group_flags(struct btrfs_root *root, u64 flags)
5711 u64 stripped = BTRFS_BLOCK_GROUP_RAID0 |
5712 BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10;
5714 num_devices = root->fs_info->fs_devices->rw_devices;
5715 if (num_devices == 1) {
5716 stripped |= BTRFS_BLOCK_GROUP_DUP;
5717 stripped = flags & ~stripped;
5719 /* turn raid0 into single device chunks */
5720 if (flags & BTRFS_BLOCK_GROUP_RAID0)
5723 /* turn mirroring into duplication */
5724 if (flags & (BTRFS_BLOCK_GROUP_RAID1 |
5725 BTRFS_BLOCK_GROUP_RAID10))
5726 return stripped | BTRFS_BLOCK_GROUP_DUP;
5729 /* they already had raid on here, just return */
5730 if (flags & stripped)
5733 stripped |= BTRFS_BLOCK_GROUP_DUP;
5734 stripped = flags & ~stripped;
5736 /* switch duplicated blocks with raid1 */
5737 if (flags & BTRFS_BLOCK_GROUP_DUP)
5738 return stripped | BTRFS_BLOCK_GROUP_RAID1;
5740 /* turn single device chunks into raid0 */
5741 return stripped | BTRFS_BLOCK_GROUP_RAID0;
5746 static int __alloc_chunk_for_shrink(struct btrfs_root *root,
5747 struct btrfs_block_group_cache *shrink_block_group,
5750 struct btrfs_trans_handle *trans;
5751 u64 new_alloc_flags;
5754 spin_lock(&shrink_block_group->lock);
5755 if (btrfs_block_group_used(&shrink_block_group->item) > 0) {
5756 spin_unlock(&shrink_block_group->lock);
5758 trans = btrfs_start_transaction(root, 1);
5759 spin_lock(&shrink_block_group->lock);
5761 new_alloc_flags = update_block_group_flags(root,
5762 shrink_block_group->flags);
5763 if (new_alloc_flags != shrink_block_group->flags) {
5765 btrfs_block_group_used(&shrink_block_group->item);
5767 calc = shrink_block_group->key.offset;
5769 spin_unlock(&shrink_block_group->lock);
5771 do_chunk_alloc(trans, root->fs_info->extent_root,
5772 calc + 2 * 1024 * 1024, new_alloc_flags, force);
5774 btrfs_end_transaction(trans, root);
5776 spin_unlock(&shrink_block_group->lock);
5780 static int __insert_orphan_inode(struct btrfs_trans_handle *trans,
5781 struct btrfs_root *root,
5782 u64 objectid, u64 size)
5784 struct btrfs_path *path;
5785 struct btrfs_inode_item *item;
5786 struct extent_buffer *leaf;
5789 path = btrfs_alloc_path();
5793 ret = btrfs_insert_empty_inode(trans, root, path, objectid);
5797 leaf = path->nodes[0];
5798 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item);
5799 memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
5800 btrfs_set_inode_generation(leaf, item, 1);
5801 btrfs_set_inode_size(leaf, item, size);
5802 btrfs_set_inode_mode(leaf, item, S_IFREG | 0600);
5803 btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS);
5804 btrfs_mark_buffer_dirty(leaf);
5805 btrfs_release_path(root, path);
5807 btrfs_free_path(path);
5811 static noinline struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
5812 struct btrfs_block_group_cache *group)
5814 struct inode *inode = NULL;
5815 struct btrfs_trans_handle *trans;
5816 struct btrfs_root *root;
5817 struct btrfs_key root_key;
5818 u64 objectid = BTRFS_FIRST_FREE_OBJECTID;
5821 root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
5822 root_key.type = BTRFS_ROOT_ITEM_KEY;
5823 root_key.offset = (u64)-1;
5824 root = btrfs_read_fs_root_no_name(fs_info, &root_key);
5826 return ERR_CAST(root);
5828 trans = btrfs_start_transaction(root, 1);
5831 err = btrfs_find_free_objectid(trans, root, objectid, &objectid);
5835 err = __insert_orphan_inode(trans, root, objectid, group->key.offset);
5838 err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0,
5839 group->key.offset, 0, group->key.offset,
5843 inode = btrfs_iget_locked(root->fs_info->sb, objectid, root);
5844 if (inode->i_state & I_NEW) {
5845 BTRFS_I(inode)->root = root;
5846 BTRFS_I(inode)->location.objectid = objectid;
5847 BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
5848 BTRFS_I(inode)->location.offset = 0;
5849 btrfs_read_locked_inode(inode);
5850 unlock_new_inode(inode);
5851 BUG_ON(is_bad_inode(inode));
5855 BTRFS_I(inode)->index_cnt = group->key.objectid;
5857 err = btrfs_orphan_add(trans, inode);
5859 btrfs_end_transaction(trans, root);
5863 inode = ERR_PTR(err);
5868 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len)
5871 struct btrfs_ordered_sum *sums;
5872 struct btrfs_sector_sum *sector_sum;
5873 struct btrfs_ordered_extent *ordered;
5874 struct btrfs_root *root = BTRFS_I(inode)->root;
5875 struct list_head list;
5880 INIT_LIST_HEAD(&list);
5882 ordered = btrfs_lookup_ordered_extent(inode, file_pos);
5883 BUG_ON(ordered->file_offset != file_pos || ordered->len != len);
5885 disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt;
5886 ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr,
5887 disk_bytenr + len - 1, &list);
5889 while (!list_empty(&list)) {
5890 sums = list_entry(list.next, struct btrfs_ordered_sum, list);
5891 list_del_init(&sums->list);
5893 sector_sum = sums->sums;
5894 sums->bytenr = ordered->start;
5897 while (offset < sums->len) {
5898 sector_sum->bytenr += ordered->start - disk_bytenr;
5900 offset += root->sectorsize;
5903 btrfs_add_ordered_sum(inode, ordered, sums);
5905 btrfs_put_ordered_extent(ordered);
5909 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start)
5911 struct btrfs_trans_handle *trans;
5912 struct btrfs_path *path;
5913 struct btrfs_fs_info *info = root->fs_info;
5914 struct extent_buffer *leaf;
5915 struct inode *reloc_inode;
5916 struct btrfs_block_group_cache *block_group;
5917 struct btrfs_key key;
5926 root = root->fs_info->extent_root;
5928 block_group = btrfs_lookup_block_group(info, group_start);
5929 BUG_ON(!block_group);
5931 printk(KERN_INFO "btrfs relocating block group %llu flags %llu\n",
5932 (unsigned long long)block_group->key.objectid,
5933 (unsigned long long)block_group->flags);
5935 path = btrfs_alloc_path();
5938 reloc_inode = create_reloc_inode(info, block_group);
5939 BUG_ON(IS_ERR(reloc_inode));
5941 __alloc_chunk_for_shrink(root, block_group, 1);
5942 set_block_group_readonly(block_group);
5944 btrfs_start_delalloc_inodes(info->tree_root);
5945 btrfs_wait_ordered_extents(info->tree_root, 0);
5950 key.objectid = block_group->key.objectid;
5953 cur_byte = key.objectid;
5955 trans = btrfs_start_transaction(info->tree_root, 1);
5956 btrfs_commit_transaction(trans, info->tree_root);
5958 mutex_lock(&root->fs_info->cleaner_mutex);
5959 btrfs_clean_old_snapshots(info->tree_root);
5960 btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1);
5961 mutex_unlock(&root->fs_info->cleaner_mutex);
5964 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
5968 leaf = path->nodes[0];
5969 nritems = btrfs_header_nritems(leaf);
5970 if (path->slots[0] >= nritems) {
5971 ret = btrfs_next_leaf(root, path);
5978 leaf = path->nodes[0];
5979 nritems = btrfs_header_nritems(leaf);
5982 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
5984 if (key.objectid >= block_group->key.objectid +
5985 block_group->key.offset)
5988 if (progress && need_resched()) {
5989 btrfs_release_path(root, path);
5996 if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY ||
5997 key.objectid + key.offset <= cur_byte) {
6003 cur_byte = key.objectid + key.offset;
6004 btrfs_release_path(root, path);
6006 __alloc_chunk_for_shrink(root, block_group, 0);
6007 ret = relocate_one_extent(root, path, &key, block_group,
6013 key.objectid = cur_byte;
6018 btrfs_release_path(root, path);
6021 btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1);
6022 invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1);
6025 if (total_found > 0) {
6026 printk(KERN_INFO "btrfs found %llu extents in pass %d\n",
6027 (unsigned long long)total_found, pass);
6029 if (total_found == skipped && pass > 2) {
6031 reloc_inode = create_reloc_inode(info, block_group);
6037 /* delete reloc_inode */
6040 /* unpin extents in this range */
6041 trans = btrfs_start_transaction(info->tree_root, 1);
6042 btrfs_commit_transaction(trans, info->tree_root);
6044 spin_lock(&block_group->lock);
6045 WARN_ON(block_group->pinned > 0);
6046 WARN_ON(block_group->reserved > 0);
6047 WARN_ON(btrfs_block_group_used(&block_group->item) > 0);
6048 spin_unlock(&block_group->lock);
6049 put_block_group(block_group);
6052 btrfs_free_path(path);
6056 static int find_first_block_group(struct btrfs_root *root,
6057 struct btrfs_path *path, struct btrfs_key *key)
6060 struct btrfs_key found_key;
6061 struct extent_buffer *leaf;
6064 ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
6069 slot = path->slots[0];
6070 leaf = path->nodes[0];
6071 if (slot >= btrfs_header_nritems(leaf)) {
6072 ret = btrfs_next_leaf(root, path);
6079 btrfs_item_key_to_cpu(leaf, &found_key, slot);
6081 if (found_key.objectid >= key->objectid &&
6082 found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
6093 int btrfs_free_block_groups(struct btrfs_fs_info *info)
6095 struct btrfs_block_group_cache *block_group;
6098 spin_lock(&info->block_group_cache_lock);
6099 while ((n = rb_last(&info->block_group_cache_tree)) != NULL) {
6100 block_group = rb_entry(n, struct btrfs_block_group_cache,
6102 rb_erase(&block_group->cache_node,
6103 &info->block_group_cache_tree);
6104 spin_unlock(&info->block_group_cache_lock);
6106 btrfs_remove_free_space_cache(block_group);
6107 down_write(&block_group->space_info->groups_sem);
6108 list_del(&block_group->list);
6109 up_write(&block_group->space_info->groups_sem);
6111 WARN_ON(atomic_read(&block_group->count) != 1);
6114 spin_lock(&info->block_group_cache_lock);
6116 spin_unlock(&info->block_group_cache_lock);
6120 int btrfs_read_block_groups(struct btrfs_root *root)
6122 struct btrfs_path *path;
6124 struct btrfs_block_group_cache *cache;
6125 struct btrfs_fs_info *info = root->fs_info;
6126 struct btrfs_space_info *space_info;
6127 struct btrfs_key key;
6128 struct btrfs_key found_key;
6129 struct extent_buffer *leaf;
6131 root = info->extent_root;
6134 btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY);
6135 path = btrfs_alloc_path();
6140 ret = find_first_block_group(root, path, &key);
6148 leaf = path->nodes[0];
6149 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
6150 cache = kzalloc(sizeof(*cache), GFP_NOFS);
6156 atomic_set(&cache->count, 1);
6157 spin_lock_init(&cache->lock);
6158 mutex_init(&cache->alloc_mutex);
6159 mutex_init(&cache->cache_mutex);
6160 INIT_LIST_HEAD(&cache->list);
6161 read_extent_buffer(leaf, &cache->item,
6162 btrfs_item_ptr_offset(leaf, path->slots[0]),
6163 sizeof(cache->item));
6164 memcpy(&cache->key, &found_key, sizeof(found_key));
6166 key.objectid = found_key.objectid + found_key.offset;
6167 btrfs_release_path(root, path);
6168 cache->flags = btrfs_block_group_flags(&cache->item);
6170 ret = update_space_info(info, cache->flags, found_key.offset,
6171 btrfs_block_group_used(&cache->item),
6174 cache->space_info = space_info;
6175 down_write(&space_info->groups_sem);
6176 list_add_tail(&cache->list, &space_info->block_groups);
6177 up_write(&space_info->groups_sem);
6179 ret = btrfs_add_block_group_cache(root->fs_info, cache);
6182 set_avail_alloc_bits(root->fs_info, cache->flags);
6183 if (btrfs_chunk_readonly(root, cache->key.objectid))
6184 set_block_group_readonly(cache);
6188 btrfs_free_path(path);
6192 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
6193 struct btrfs_root *root, u64 bytes_used,
6194 u64 type, u64 chunk_objectid, u64 chunk_offset,
6198 struct btrfs_root *extent_root;
6199 struct btrfs_block_group_cache *cache;
6201 extent_root = root->fs_info->extent_root;
6203 root->fs_info->last_trans_new_blockgroup = trans->transid;
6205 cache = kzalloc(sizeof(*cache), GFP_NOFS);
6209 cache->key.objectid = chunk_offset;
6210 cache->key.offset = size;
6211 cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
6212 atomic_set(&cache->count, 1);
6213 spin_lock_init(&cache->lock);
6214 mutex_init(&cache->alloc_mutex);
6215 mutex_init(&cache->cache_mutex);
6216 INIT_LIST_HEAD(&cache->list);
6218 btrfs_set_block_group_used(&cache->item, bytes_used);
6219 btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid);
6220 cache->flags = type;
6221 btrfs_set_block_group_flags(&cache->item, type);
6223 ret = update_space_info(root->fs_info, cache->flags, size, bytes_used,
6224 &cache->space_info);
6226 down_write(&cache->space_info->groups_sem);
6227 list_add_tail(&cache->list, &cache->space_info->block_groups);
6228 up_write(&cache->space_info->groups_sem);
6230 ret = btrfs_add_block_group_cache(root->fs_info, cache);
6233 ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item,
6234 sizeof(cache->item));
6237 finish_current_insert(trans, extent_root, 0);
6238 ret = del_pending_extents(trans, extent_root, 0);
6240 set_avail_alloc_bits(extent_root->fs_info, type);
6245 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
6246 struct btrfs_root *root, u64 group_start)
6248 struct btrfs_path *path;
6249 struct btrfs_block_group_cache *block_group;
6250 struct btrfs_key key;
6253 root = root->fs_info->extent_root;
6255 block_group = btrfs_lookup_block_group(root->fs_info, group_start);
6256 BUG_ON(!block_group);
6257 BUG_ON(!block_group->ro);
6259 memcpy(&key, &block_group->key, sizeof(key));
6261 path = btrfs_alloc_path();
6264 spin_lock(&root->fs_info->block_group_cache_lock);
6265 rb_erase(&block_group->cache_node,
6266 &root->fs_info->block_group_cache_tree);
6267 spin_unlock(&root->fs_info->block_group_cache_lock);
6268 btrfs_remove_free_space_cache(block_group);
6269 down_write(&block_group->space_info->groups_sem);
6270 list_del(&block_group->list);
6271 up_write(&block_group->space_info->groups_sem);
6273 spin_lock(&block_group->space_info->lock);
6274 block_group->space_info->total_bytes -= block_group->key.offset;
6275 block_group->space_info->bytes_readonly -= block_group->key.offset;
6276 spin_unlock(&block_group->space_info->lock);
6277 block_group->space_info->full = 0;
6279 put_block_group(block_group);
6280 put_block_group(block_group);
6282 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
6288 ret = btrfs_del_item(trans, root, path);
6290 btrfs_free_path(path);