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>
24 #include "print-tree.h"
25 #include "transaction.h"
28 #define BLOCK_GROUP_DATA EXTENT_WRITEBACK
29 #define BLOCK_GROUP_METADATA EXTENT_UPTODATE
30 #define BLOCK_GROUP_SYSTEM EXTENT_NEW
32 #define BLOCK_GROUP_DIRTY EXTENT_DIRTY
34 static int finish_current_insert(struct btrfs_trans_handle *trans, struct
35 btrfs_root *extent_root);
36 static int del_pending_extents(struct btrfs_trans_handle *trans, struct
37 btrfs_root *extent_root);
40 static int cache_block_group(struct btrfs_root *root,
41 struct btrfs_block_group_cache *block_group)
43 struct btrfs_path *path;
46 struct extent_buffer *leaf;
47 struct extent_io_tree *free_space_cache;
57 root = root->fs_info->extent_root;
58 free_space_cache = &root->fs_info->free_space_cache;
60 if (block_group->cached)
63 path = btrfs_alloc_path();
68 first_free = block_group->key.objectid;
69 key.objectid = block_group->key.objectid;
71 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
72 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
75 ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY);
79 leaf = path->nodes[0];
80 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
81 if (key.objectid + key.offset > first_free)
82 first_free = key.objectid + key.offset;
85 leaf = path->nodes[0];
86 slot = path->slots[0];
87 if (slot >= btrfs_header_nritems(leaf)) {
88 ret = btrfs_next_leaf(root, path);
97 btrfs_item_key_to_cpu(leaf, &key, slot);
98 if (key.objectid < block_group->key.objectid) {
101 if (key.objectid >= block_group->key.objectid +
102 block_group->key.offset) {
106 if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) {
111 if (key.objectid > last) {
112 hole_size = key.objectid - last;
113 set_extent_dirty(free_space_cache, last,
114 last + hole_size - 1,
117 last = key.objectid + key.offset;
125 if (block_group->key.objectid +
126 block_group->key.offset > last) {
127 hole_size = block_group->key.objectid +
128 block_group->key.offset - last;
129 set_extent_dirty(free_space_cache, last,
130 last + hole_size - 1, GFP_NOFS);
132 block_group->cached = 1;
134 btrfs_free_path(path);
138 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
142 struct extent_io_tree *block_group_cache;
143 struct btrfs_block_group_cache *block_group = NULL;
149 block_group_cache = &info->block_group_cache;
150 ret = find_first_extent_bit(block_group_cache,
151 bytenr, &start, &end,
152 BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA |
157 ret = get_state_private(block_group_cache, start, &ptr);
161 block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr;
162 if (block_group->key.objectid <= bytenr && bytenr <
163 block_group->key.objectid + block_group->key.offset)
168 static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
170 return (cache->flags & bits) == bits;
173 static int noinline find_search_start(struct btrfs_root *root,
174 struct btrfs_block_group_cache **cache_ret,
175 u64 *start_ret, int num, int data)
178 struct btrfs_block_group_cache *cache = *cache_ret;
179 struct extent_io_tree *free_space_cache;
180 struct extent_state *state;
185 u64 search_start = *start_ret;
190 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
191 free_space_cache = &root->fs_info->free_space_cache;
194 ret = cache_block_group(root, cache);
198 last = max(search_start, cache->key.objectid);
199 if (!block_group_bits(cache, data)) {
203 spin_lock_irq(&free_space_cache->lock);
204 state = find_first_extent_bit_state(free_space_cache, last, EXTENT_DIRTY);
209 spin_unlock_irq(&free_space_cache->lock);
213 start = max(last, state->start);
214 last = state->end + 1;
215 if (last - start < num) {
216 if (last == cache->key.objectid + cache->key.offset)
219 state = extent_state_next(state);
220 } while(state && !(state->state & EXTENT_DIRTY));
223 spin_unlock_irq(&free_space_cache->lock);
224 if (start + num > cache->key.objectid + cache->key.offset)
226 if (start + num > total_fs_bytes)
228 if (!block_group_bits(cache, data)) {
229 printk("block group bits don't match %Lu %d\n", cache->flags, data);
235 cache = btrfs_lookup_block_group(root->fs_info, search_start);
237 printk("Unable to find block group for %Lu\n", search_start);
243 last = cache->key.objectid + cache->key.offset;
245 cache = btrfs_lookup_block_group(root->fs_info, last);
246 if (!cache || cache->key.objectid >= total_fs_bytes) {
255 if (cache_miss && !cache->cached) {
256 cache_block_group(root, cache);
258 cache = btrfs_lookup_block_group(root->fs_info, last);
260 cache = btrfs_find_block_group(root, cache, last, data, 0);
268 static u64 div_factor(u64 num, int factor)
277 static int block_group_state_bits(u64 flags)
280 if (flags & BTRFS_BLOCK_GROUP_DATA)
281 bits |= BLOCK_GROUP_DATA;
282 if (flags & BTRFS_BLOCK_GROUP_METADATA)
283 bits |= BLOCK_GROUP_METADATA;
284 if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
285 bits |= BLOCK_GROUP_SYSTEM;
289 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
290 struct btrfs_block_group_cache
291 *hint, u64 search_start,
294 struct btrfs_block_group_cache *cache;
295 struct extent_io_tree *block_group_cache;
296 struct btrfs_block_group_cache *found_group = NULL;
297 struct btrfs_fs_info *info = root->fs_info;
311 block_group_cache = &info->block_group_cache;
312 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
317 bit = block_group_state_bits(data);
319 if (search_start && search_start < total_fs_bytes) {
320 struct btrfs_block_group_cache *shint;
321 shint = btrfs_lookup_block_group(info, search_start);
322 if (shint && block_group_bits(shint, data)) {
323 used = btrfs_block_group_used(&shint->item);
324 if (used + shint->pinned <
325 div_factor(shint->key.offset, factor)) {
330 if (hint && block_group_bits(hint, data) &&
331 hint->key.objectid < total_fs_bytes) {
332 used = btrfs_block_group_used(&hint->item);
333 if (used + hint->pinned <
334 div_factor(hint->key.offset, factor)) {
337 last = hint->key.objectid + hint->key.offset;
341 hint_last = max(hint->key.objectid, search_start);
343 hint_last = search_start;
345 if (hint_last >= total_fs_bytes)
346 hint_last = search_start;
351 ret = find_first_extent_bit(block_group_cache, last,
356 ret = get_state_private(block_group_cache, start, &ptr);
360 cache = (struct btrfs_block_group_cache *)(unsigned long)ptr;
361 last = cache->key.objectid + cache->key.offset;
362 used = btrfs_block_group_used(&cache->item);
364 if (cache->key.objectid > total_fs_bytes)
367 if (block_group_bits(cache, data)) {
369 free_check = cache->key.offset;
371 free_check = div_factor(cache->key.offset,
374 if (used + cache->pinned < free_check) {
390 static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation,
391 u64 owner, u64 owner_offset)
393 u32 high_crc = ~(u32)0;
394 u32 low_crc = ~(u32)0;
396 lenum = cpu_to_le64(root_objectid);
397 high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum));
398 lenum = cpu_to_le64(ref_generation);
399 low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
400 if (owner >= BTRFS_FIRST_FREE_OBJECTID) {
401 lenum = cpu_to_le64(owner);
402 low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
403 lenum = cpu_to_le64(owner_offset);
404 low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
406 return ((u64)high_crc << 32) | (u64)low_crc;
409 static int match_extent_ref(struct extent_buffer *leaf,
410 struct btrfs_extent_ref *disk_ref,
411 struct btrfs_extent_ref *cpu_ref)
416 if (cpu_ref->objectid)
417 len = sizeof(*cpu_ref);
419 len = 2 * sizeof(u64);
420 ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref,
425 static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans,
426 struct btrfs_root *root,
427 struct btrfs_path *path, u64 bytenr,
429 u64 ref_generation, u64 owner,
430 u64 owner_offset, int del)
433 struct btrfs_key key;
434 struct btrfs_key found_key;
435 struct btrfs_extent_ref ref;
436 struct extent_buffer *leaf;
437 struct btrfs_extent_ref *disk_ref;
441 btrfs_set_stack_ref_root(&ref, root_objectid);
442 btrfs_set_stack_ref_generation(&ref, ref_generation);
443 btrfs_set_stack_ref_objectid(&ref, owner);
444 btrfs_set_stack_ref_offset(&ref, owner_offset);
446 hash = hash_extent_ref(root_objectid, ref_generation, owner,
449 key.objectid = bytenr;
450 key.type = BTRFS_EXTENT_REF_KEY;
453 ret = btrfs_search_slot(trans, root, &key, path,
457 leaf = path->nodes[0];
459 u32 nritems = btrfs_header_nritems(leaf);
460 if (path->slots[0] >= nritems) {
461 ret2 = btrfs_next_leaf(root, path);
464 leaf = path->nodes[0];
466 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
467 if (found_key.objectid != bytenr ||
468 found_key.type != BTRFS_EXTENT_REF_KEY)
470 key.offset = found_key.offset;
472 btrfs_release_path(root, path);
476 disk_ref = btrfs_item_ptr(path->nodes[0],
478 struct btrfs_extent_ref);
479 if (match_extent_ref(path->nodes[0], disk_ref, &ref)) {
483 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
484 key.offset = found_key.offset + 1;
485 btrfs_release_path(root, path);
492 * Back reference rules. Back refs have three main goals:
494 * 1) differentiate between all holders of references to an extent so that
495 * when a reference is dropped we can make sure it was a valid reference
496 * before freeing the extent.
498 * 2) Provide enough information to quickly find the holders of an extent
499 * if we notice a given block is corrupted or bad.
501 * 3) Make it easy to migrate blocks for FS shrinking or storage pool
502 * maintenance. This is actually the same as #2, but with a slightly
503 * different use case.
505 * File extents can be referenced by:
507 * - multiple snapshots, subvolumes, or different generations in one subvol
508 * - different files inside a single subvolume (in theory, not implemented yet)
509 * - different offsets inside a file (bookend extents in file.c)
511 * The extent ref structure has fields for:
513 * - Objectid of the subvolume root
514 * - Generation number of the tree holding the reference
515 * - objectid of the file holding the reference
516 * - offset in the file corresponding to the key holding the reference
518 * When a file extent is allocated the fields are filled in:
519 * (root_key.objectid, trans->transid, inode objectid, offset in file)
521 * When a leaf is cow'd new references are added for every file extent found
522 * in the leaf. It looks the same as the create case, but trans->transid
523 * will be different when the block is cow'd.
525 * (root_key.objectid, trans->transid, inode objectid, offset in file)
527 * When a file extent is removed either during snapshot deletion or file
528 * truncation, the corresponding back reference is found
531 * (btrfs_header_owner(leaf), btrfs_header_generation(leaf),
532 * inode objectid, offset in file)
534 * Btree extents can be referenced by:
536 * - Different subvolumes
537 * - Different generations of the same subvolume
539 * Storing sufficient information for a full reverse mapping of a btree
540 * block would require storing the lowest key of the block in the backref,
541 * and it would require updating that lowest key either before write out or
542 * every time it changed. Instead, the objectid of the lowest key is stored
543 * along with the level of the tree block. This provides a hint
544 * about where in the btree the block can be found. Searches through the
545 * btree only need to look for a pointer to that block, so they stop one
546 * level higher than the level recorded in the backref.
548 * Some btrees do not do reference counting on their extents. These
549 * include the extent tree and the tree of tree roots. Backrefs for these
550 * trees always have a generation of zero.
552 * When a tree block is created, back references are inserted:
554 * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid)
556 * When a tree block is cow'd in a reference counted root,
557 * new back references are added for all the blocks it points to.
558 * These are of the form (trans->transid will have increased since creation):
560 * (root->root_key.objectid, trans->transid, level, lowest_key_objectid)
562 * Because the lowest_key_objectid and the level are just hints
563 * they are not used when backrefs are deleted. When a backref is deleted:
565 * if backref was for a tree root:
566 * root_objectid = root->root_key.objectid
568 * root_objectid = btrfs_header_owner(parent)
570 * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0)
572 * Back Reference Key hashing:
574 * Back references have four fields, each 64 bits long. Unfortunately,
575 * This is hashed into a single 64 bit number and placed into the key offset.
576 * The key objectid corresponds to the first byte in the extent, and the
577 * key type is set to BTRFS_EXTENT_REF_KEY
579 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
580 struct btrfs_root *root,
581 struct btrfs_path *path, u64 bytenr,
582 u64 root_objectid, u64 ref_generation,
583 u64 owner, u64 owner_offset)
586 struct btrfs_key key;
587 struct btrfs_extent_ref ref;
588 struct btrfs_extent_ref *disk_ref;
591 btrfs_set_stack_ref_root(&ref, root_objectid);
592 btrfs_set_stack_ref_generation(&ref, ref_generation);
593 btrfs_set_stack_ref_objectid(&ref, owner);
594 btrfs_set_stack_ref_offset(&ref, owner_offset);
596 hash = hash_extent_ref(root_objectid, ref_generation, owner,
599 key.objectid = bytenr;
600 key.type = BTRFS_EXTENT_REF_KEY;
602 ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref));
603 while (ret == -EEXIST) {
604 disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
605 struct btrfs_extent_ref);
606 if (match_extent_ref(path->nodes[0], disk_ref, &ref))
609 btrfs_release_path(root, path);
610 ret = btrfs_insert_empty_item(trans, root, path, &key,
615 disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
616 struct btrfs_extent_ref);
617 write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref,
619 btrfs_mark_buffer_dirty(path->nodes[0]);
621 btrfs_release_path(root, path);
625 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
626 struct btrfs_root *root,
627 u64 bytenr, u64 num_bytes,
628 u64 root_objectid, u64 ref_generation,
629 u64 owner, u64 owner_offset)
631 struct btrfs_path *path;
633 struct btrfs_key key;
634 struct extent_buffer *l;
635 struct btrfs_extent_item *item;
638 WARN_ON(num_bytes < root->sectorsize);
639 path = btrfs_alloc_path();
644 key.objectid = bytenr;
645 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
646 key.offset = num_bytes;
647 ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
656 item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
657 refs = btrfs_extent_refs(l, item);
658 btrfs_set_extent_refs(l, item, refs + 1);
659 btrfs_mark_buffer_dirty(path->nodes[0]);
661 btrfs_release_path(root->fs_info->extent_root, path);
664 ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root,
665 path, bytenr, root_objectid,
666 ref_generation, owner, owner_offset);
668 finish_current_insert(trans, root->fs_info->extent_root);
669 del_pending_extents(trans, root->fs_info->extent_root);
671 btrfs_free_path(path);
675 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
676 struct btrfs_root *root)
678 finish_current_insert(trans, root->fs_info->extent_root);
679 del_pending_extents(trans, root->fs_info->extent_root);
683 static int lookup_extent_ref(struct btrfs_trans_handle *trans,
684 struct btrfs_root *root, u64 bytenr,
685 u64 num_bytes, u32 *refs)
687 struct btrfs_path *path;
689 struct btrfs_key key;
690 struct extent_buffer *l;
691 struct btrfs_extent_item *item;
693 WARN_ON(num_bytes < root->sectorsize);
694 path = btrfs_alloc_path();
696 key.objectid = bytenr;
697 key.offset = num_bytes;
698 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
699 ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
704 btrfs_print_leaf(root, path->nodes[0]);
705 printk("failed to find block number %Lu\n", bytenr);
709 item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
710 *refs = btrfs_extent_refs(l, item);
712 btrfs_free_path(path);
716 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
717 struct btrfs_path *count_path,
720 struct btrfs_root *extent_root = root->fs_info->extent_root;
721 struct btrfs_path *path;
724 u64 root_objectid = root->root_key.objectid;
729 struct btrfs_key key;
730 struct btrfs_key found_key;
731 struct extent_buffer *l;
732 struct btrfs_extent_item *item;
733 struct btrfs_extent_ref *ref_item;
736 path = btrfs_alloc_path();
739 bytenr = first_extent;
741 bytenr = count_path->nodes[level]->start;
744 key.objectid = bytenr;
747 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
748 ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
754 btrfs_item_key_to_cpu(l, &found_key, path->slots[0]);
756 if (found_key.objectid != bytenr ||
757 found_key.type != BTRFS_EXTENT_ITEM_KEY) {
761 item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
764 nritems = btrfs_header_nritems(l);
765 if (path->slots[0] >= nritems) {
766 ret = btrfs_next_leaf(extent_root, path);
771 btrfs_item_key_to_cpu(l, &found_key, path->slots[0]);
772 if (found_key.objectid != bytenr)
775 if (found_key.type != BTRFS_EXTENT_REF_KEY) {
781 ref_item = btrfs_item_ptr(l, path->slots[0],
782 struct btrfs_extent_ref);
783 found_objectid = btrfs_ref_root(l, ref_item);
785 if (found_objectid != root_objectid) {
792 if (cur_count == 0) {
796 if (level >= 0 && root->node == count_path->nodes[level])
799 btrfs_release_path(root, path);
803 btrfs_free_path(path);
806 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
807 struct btrfs_root *root, u64 owner_objectid)
813 struct btrfs_disk_key disk_key;
815 level = btrfs_header_level(root->node);
816 generation = trans->transid;
817 nritems = btrfs_header_nritems(root->node);
820 btrfs_item_key(root->node, &disk_key, 0);
822 btrfs_node_key(root->node, &disk_key, 0);
823 key_objectid = btrfs_disk_key_objectid(&disk_key);
827 return btrfs_inc_extent_ref(trans, root, root->node->start,
828 root->node->len, owner_objectid,
829 generation, level, key_objectid);
832 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
833 struct extent_buffer *buf)
837 struct btrfs_key key;
838 struct btrfs_file_extent_item *fi;
847 level = btrfs_header_level(buf);
848 nritems = btrfs_header_nritems(buf);
849 for (i = 0; i < nritems; i++) {
852 btrfs_item_key_to_cpu(buf, &key, i);
853 if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
855 fi = btrfs_item_ptr(buf, i,
856 struct btrfs_file_extent_item);
857 if (btrfs_file_extent_type(buf, fi) ==
858 BTRFS_FILE_EXTENT_INLINE)
860 disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
861 if (disk_bytenr == 0)
863 ret = btrfs_inc_extent_ref(trans, root, disk_bytenr,
864 btrfs_file_extent_disk_num_bytes(buf, fi),
865 root->root_key.objectid, trans->transid,
866 key.objectid, key.offset);
872 bytenr = btrfs_node_blockptr(buf, i);
873 btrfs_node_key_to_cpu(buf, &key, i);
874 ret = btrfs_inc_extent_ref(trans, root, bytenr,
875 btrfs_level_size(root, level - 1),
876 root->root_key.objectid,
878 level - 1, key.objectid);
889 for (i =0; i < faili; i++) {
892 btrfs_item_key_to_cpu(buf, &key, i);
893 if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
895 fi = btrfs_item_ptr(buf, i,
896 struct btrfs_file_extent_item);
897 if (btrfs_file_extent_type(buf, fi) ==
898 BTRFS_FILE_EXTENT_INLINE)
900 disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
901 if (disk_bytenr == 0)
903 err = btrfs_free_extent(trans, root, disk_bytenr,
904 btrfs_file_extent_disk_num_bytes(buf,
908 bytenr = btrfs_node_blockptr(buf, i);
909 err = btrfs_free_extent(trans, root, bytenr,
910 btrfs_level_size(root, level - 1), 0);
918 static int write_one_cache_group(struct btrfs_trans_handle *trans,
919 struct btrfs_root *root,
920 struct btrfs_path *path,
921 struct btrfs_block_group_cache *cache)
925 struct btrfs_root *extent_root = root->fs_info->extent_root;
927 struct extent_buffer *leaf;
929 ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1);
934 leaf = path->nodes[0];
935 bi = btrfs_item_ptr_offset(leaf, path->slots[0]);
936 write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item));
937 btrfs_mark_buffer_dirty(leaf);
938 btrfs_release_path(extent_root, path);
940 finish_current_insert(trans, extent_root);
941 pending_ret = del_pending_extents(trans, extent_root);
950 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
951 struct btrfs_root *root)
953 struct extent_io_tree *block_group_cache;
954 struct btrfs_block_group_cache *cache;
958 struct btrfs_path *path;
964 block_group_cache = &root->fs_info->block_group_cache;
965 path = btrfs_alloc_path();
970 ret = find_first_extent_bit(block_group_cache, last,
971 &start, &end, BLOCK_GROUP_DIRTY);
976 ret = get_state_private(block_group_cache, start, &ptr);
979 cache = (struct btrfs_block_group_cache *)(unsigned long)ptr;
980 err = write_one_cache_group(trans, root,
983 * if we fail to write the cache group, we want
984 * to keep it marked dirty in hopes that a later
991 clear_extent_bits(block_group_cache, start, end,
992 BLOCK_GROUP_DIRTY, GFP_NOFS);
994 btrfs_free_path(path);
998 static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
1001 struct list_head *head = &info->space_info;
1002 struct list_head *cur;
1003 struct btrfs_space_info *found;
1004 list_for_each(cur, head) {
1005 found = list_entry(cur, struct btrfs_space_info, list);
1006 if (found->flags == flags)
1013 static int update_space_info(struct btrfs_fs_info *info, u64 flags,
1014 u64 total_bytes, u64 bytes_used,
1015 struct btrfs_space_info **space_info)
1017 struct btrfs_space_info *found;
1019 found = __find_space_info(info, flags);
1021 found->total_bytes += total_bytes;
1022 found->bytes_used += bytes_used;
1023 WARN_ON(found->total_bytes < found->bytes_used);
1024 *space_info = found;
1027 found = kmalloc(sizeof(*found), GFP_NOFS);
1031 list_add(&found->list, &info->space_info);
1032 found->flags = flags;
1033 found->total_bytes = total_bytes;
1034 found->bytes_used = bytes_used;
1035 found->bytes_pinned = 0;
1037 *space_info = found;
1041 static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
1043 u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 |
1044 BTRFS_BLOCK_GROUP_RAID1 |
1045 BTRFS_BLOCK_GROUP_RAID10 |
1046 BTRFS_BLOCK_GROUP_DUP);
1048 if (flags & BTRFS_BLOCK_GROUP_DATA)
1049 fs_info->avail_data_alloc_bits |= extra_flags;
1050 if (flags & BTRFS_BLOCK_GROUP_METADATA)
1051 fs_info->avail_metadata_alloc_bits |= extra_flags;
1052 if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
1053 fs_info->avail_system_alloc_bits |= extra_flags;
1057 static int do_chunk_alloc(struct btrfs_trans_handle *trans,
1058 struct btrfs_root *extent_root, u64 alloc_bytes,
1061 struct btrfs_space_info *space_info;
1067 space_info = __find_space_info(extent_root->fs_info, flags);
1069 ret = update_space_info(extent_root->fs_info, flags,
1073 BUG_ON(!space_info);
1075 if (space_info->full)
1078 thresh = div_factor(space_info->total_bytes, 6);
1079 if ((space_info->bytes_used + space_info->bytes_pinned + alloc_bytes) <
1083 ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags);
1084 if (ret == -ENOSPC) {
1085 printk("space info full %Lu\n", flags);
1086 space_info->full = 1;
1092 ret = btrfs_make_block_group(trans, extent_root, 0, flags,
1093 BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes);
1099 static int update_block_group(struct btrfs_trans_handle *trans,
1100 struct btrfs_root *root,
1101 u64 bytenr, u64 num_bytes, int alloc,
1104 struct btrfs_block_group_cache *cache;
1105 struct btrfs_fs_info *info = root->fs_info;
1106 u64 total = num_bytes;
1113 cache = btrfs_lookup_block_group(info, bytenr);
1117 byte_in_group = bytenr - cache->key.objectid;
1118 WARN_ON(byte_in_group > cache->key.offset);
1119 start = cache->key.objectid;
1120 end = start + cache->key.offset - 1;
1121 set_extent_bits(&info->block_group_cache, start, end,
1122 BLOCK_GROUP_DIRTY, GFP_NOFS);
1124 old_val = btrfs_block_group_used(&cache->item);
1125 num_bytes = min(total, cache->key.offset - byte_in_group);
1127 old_val += num_bytes;
1128 cache->space_info->bytes_used += num_bytes;
1130 old_val -= num_bytes;
1131 cache->space_info->bytes_used -= num_bytes;
1133 set_extent_dirty(&info->free_space_cache,
1134 bytenr, bytenr + num_bytes - 1,
1138 btrfs_set_block_group_used(&cache->item, old_val);
1140 bytenr += num_bytes;
1145 static int update_pinned_extents(struct btrfs_root *root,
1146 u64 bytenr, u64 num, int pin)
1149 struct btrfs_block_group_cache *cache;
1150 struct btrfs_fs_info *fs_info = root->fs_info;
1153 set_extent_dirty(&fs_info->pinned_extents,
1154 bytenr, bytenr + num - 1, GFP_NOFS);
1156 clear_extent_dirty(&fs_info->pinned_extents,
1157 bytenr, bytenr + num - 1, GFP_NOFS);
1160 cache = btrfs_lookup_block_group(fs_info, bytenr);
1162 len = min(num, cache->key.offset -
1163 (bytenr - cache->key.objectid));
1165 cache->pinned += len;
1166 cache->space_info->bytes_pinned += len;
1167 fs_info->total_pinned += len;
1169 cache->pinned -= len;
1170 cache->space_info->bytes_pinned -= len;
1171 fs_info->total_pinned -= len;
1179 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy)
1184 struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents;
1188 ret = find_first_extent_bit(pinned_extents, last,
1189 &start, &end, EXTENT_DIRTY);
1192 set_extent_dirty(copy, start, end, GFP_NOFS);
1198 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1199 struct btrfs_root *root,
1200 struct extent_io_tree *unpin)
1205 struct extent_io_tree *free_space_cache;
1206 free_space_cache = &root->fs_info->free_space_cache;
1209 ret = find_first_extent_bit(unpin, 0, &start, &end,
1213 update_pinned_extents(root, start, end + 1 - start, 0);
1214 clear_extent_dirty(unpin, start, end, GFP_NOFS);
1215 set_extent_dirty(free_space_cache, start, end, GFP_NOFS);
1220 static int finish_current_insert(struct btrfs_trans_handle *trans,
1221 struct btrfs_root *extent_root)
1225 struct btrfs_fs_info *info = extent_root->fs_info;
1226 struct extent_buffer *eb;
1227 struct btrfs_path *path;
1228 struct btrfs_key ins;
1229 struct btrfs_disk_key first;
1230 struct btrfs_extent_item extent_item;
1235 btrfs_set_stack_extent_refs(&extent_item, 1);
1236 btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY);
1237 path = btrfs_alloc_path();
1240 ret = find_first_extent_bit(&info->extent_ins, 0, &start,
1241 &end, EXTENT_LOCKED);
1245 ins.objectid = start;
1246 ins.offset = end + 1 - start;
1247 err = btrfs_insert_item(trans, extent_root, &ins,
1248 &extent_item, sizeof(extent_item));
1249 clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED,
1251 eb = read_tree_block(extent_root, ins.objectid, ins.offset);
1252 level = btrfs_header_level(eb);
1254 btrfs_item_key(eb, &first, 0);
1256 btrfs_node_key(eb, &first, 0);
1258 err = btrfs_insert_extent_backref(trans, extent_root, path,
1259 start, extent_root->root_key.objectid,
1261 btrfs_disk_key_objectid(&first));
1263 free_extent_buffer(eb);
1265 btrfs_free_path(path);
1269 static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
1273 struct extent_buffer *buf;
1276 buf = btrfs_find_tree_block(root, bytenr, num_bytes);
1278 if (btrfs_buffer_uptodate(buf)) {
1280 root->fs_info->running_transaction->transid;
1281 u64 header_transid =
1282 btrfs_header_generation(buf);
1283 if (header_transid == transid &&
1284 !btrfs_header_flag(buf,
1285 BTRFS_HEADER_FLAG_WRITTEN)) {
1286 clean_tree_block(NULL, root, buf);
1287 free_extent_buffer(buf);
1291 free_extent_buffer(buf);
1293 update_pinned_extents(root, bytenr, num_bytes, 1);
1295 set_extent_bits(&root->fs_info->pending_del,
1296 bytenr, bytenr + num_bytes - 1,
1297 EXTENT_LOCKED, GFP_NOFS);
1304 * remove an extent from the root, returns 0 on success
1306 static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1307 *root, u64 bytenr, u64 num_bytes,
1308 u64 root_objectid, u64 ref_generation,
1309 u64 owner_objectid, u64 owner_offset, int pin,
1312 struct btrfs_path *path;
1313 struct btrfs_key key;
1314 struct btrfs_fs_info *info = root->fs_info;
1315 struct btrfs_root *extent_root = info->extent_root;
1316 struct extent_buffer *leaf;
1318 int extent_slot = 0;
1319 int found_extent = 0;
1321 struct btrfs_extent_item *ei;
1324 key.objectid = bytenr;
1325 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1326 key.offset = num_bytes;
1327 path = btrfs_alloc_path();
1332 ret = lookup_extent_backref(trans, extent_root, path,
1333 bytenr, root_objectid,
1335 owner_objectid, owner_offset, 1);
1337 struct btrfs_key found_key;
1338 extent_slot = path->slots[0];
1339 while(extent_slot > 0) {
1341 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
1343 if (found_key.objectid != bytenr)
1345 if (found_key.type == BTRFS_EXTENT_ITEM_KEY &&
1346 found_key.offset == num_bytes) {
1350 if (path->slots[0] - extent_slot > 5)
1354 ret = btrfs_del_item(trans, extent_root, path);
1356 btrfs_print_leaf(extent_root, path->nodes[0]);
1358 printk("Unable to find ref byte nr %Lu root %Lu "
1359 " gen %Lu owner %Lu offset %Lu\n", bytenr,
1360 root_objectid, ref_generation, owner_objectid,
1363 if (!found_extent) {
1364 btrfs_release_path(extent_root, path);
1365 ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
1369 extent_slot = path->slots[0];
1372 leaf = path->nodes[0];
1373 ei = btrfs_item_ptr(leaf, extent_slot,
1374 struct btrfs_extent_item);
1375 refs = btrfs_extent_refs(leaf, ei);
1378 btrfs_set_extent_refs(leaf, ei, refs);
1380 btrfs_mark_buffer_dirty(leaf);
1382 if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) {
1383 /* if the back ref and the extent are next to each other
1384 * they get deleted below in one shot
1386 path->slots[0] = extent_slot;
1388 } else if (found_extent) {
1389 /* otherwise delete the extent back ref */
1390 ret = btrfs_del_item(trans, extent_root, path);
1392 /* if refs are 0, we need to setup the path for deletion */
1394 btrfs_release_path(extent_root, path);
1395 ret = btrfs_search_slot(trans, extent_root, &key, path,
1408 ret = pin_down_bytes(root, bytenr, num_bytes, 0);
1414 /* block accounting for super block */
1415 super_used = btrfs_super_bytes_used(&info->super_copy);
1416 btrfs_set_super_bytes_used(&info->super_copy,
1417 super_used - num_bytes);
1419 /* block accounting for root item */
1420 root_used = btrfs_root_used(&root->root_item);
1421 btrfs_set_root_used(&root->root_item,
1422 root_used - num_bytes);
1423 ret = btrfs_del_items(trans, extent_root, path, path->slots[0],
1428 ret = update_block_group(trans, root, bytenr, num_bytes, 0,
1432 btrfs_free_path(path);
1433 finish_current_insert(trans, extent_root);
1438 * find all the blocks marked as pending in the radix tree and remove
1439 * them from the extent map
1441 static int del_pending_extents(struct btrfs_trans_handle *trans, struct
1442 btrfs_root *extent_root)
1448 struct extent_io_tree *pending_del;
1449 struct extent_io_tree *pinned_extents;
1451 pending_del = &extent_root->fs_info->pending_del;
1452 pinned_extents = &extent_root->fs_info->pinned_extents;
1455 ret = find_first_extent_bit(pending_del, 0, &start, &end,
1459 update_pinned_extents(extent_root, start, end + 1 - start, 1);
1460 clear_extent_bits(pending_del, start, end, EXTENT_LOCKED,
1462 ret = __free_extent(trans, extent_root,
1463 start, end + 1 - start,
1464 extent_root->root_key.objectid,
1473 * remove an extent from the root, returns 0 on success
1475 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1476 *root, u64 bytenr, u64 num_bytes,
1477 u64 root_objectid, u64 ref_generation,
1478 u64 owner_objectid, u64 owner_offset, int pin)
1480 struct btrfs_root *extent_root = root->fs_info->extent_root;
1484 WARN_ON(num_bytes < root->sectorsize);
1485 if (!root->ref_cows)
1488 if (root == extent_root) {
1489 pin_down_bytes(root, bytenr, num_bytes, 1);
1492 ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid,
1493 ref_generation, owner_objectid, owner_offset,
1495 pending_ret = del_pending_extents(trans, root->fs_info->extent_root);
1496 return ret ? ret : pending_ret;
1499 static u64 stripe_align(struct btrfs_root *root, u64 val)
1501 u64 mask = ((u64)root->stripesize - 1);
1502 u64 ret = (val + mask) & ~mask;
1507 * walks the btree of allocated extents and find a hole of a given size.
1508 * The key ins is changed to record the hole:
1509 * ins->objectid == block start
1510 * ins->flags = BTRFS_EXTENT_ITEM_KEY
1511 * ins->offset == number of blocks
1512 * Any available blocks before search_start are skipped.
1514 static int noinline find_free_extent(struct btrfs_trans_handle *trans,
1515 struct btrfs_root *orig_root,
1516 u64 num_bytes, u64 empty_size,
1517 u64 search_start, u64 search_end,
1518 u64 hint_byte, struct btrfs_key *ins,
1519 u64 exclude_start, u64 exclude_nr,
1523 u64 orig_search_start = search_start;
1524 struct btrfs_root * root = orig_root->fs_info->extent_root;
1525 struct btrfs_fs_info *info = root->fs_info;
1526 u64 total_needed = num_bytes;
1527 u64 *last_ptr = NULL;
1528 struct btrfs_block_group_cache *block_group;
1531 int empty_cluster = 2 * 1024 * 1024;
1533 WARN_ON(num_bytes < root->sectorsize);
1534 btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
1536 if (data & BTRFS_BLOCK_GROUP_METADATA) {
1537 last_ptr = &root->fs_info->last_alloc;
1538 empty_cluster = 256 * 1024;
1541 if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) {
1542 last_ptr = &root->fs_info->last_data_alloc;
1547 hint_byte = *last_ptr;
1549 empty_size += empty_cluster;
1553 if (search_end == (u64)-1)
1554 search_end = btrfs_super_total_bytes(&info->super_copy);
1557 block_group = btrfs_lookup_block_group(info, hint_byte);
1559 hint_byte = search_start;
1560 block_group = btrfs_find_block_group(root, block_group,
1561 hint_byte, data, 1);
1562 if (last_ptr && *last_ptr == 0 && block_group)
1563 hint_byte = block_group->key.objectid;
1565 block_group = btrfs_find_block_group(root,
1567 search_start, data, 1);
1569 search_start = max(search_start, hint_byte);
1571 total_needed += empty_size;
1575 block_group = btrfs_lookup_block_group(info, search_start);
1577 block_group = btrfs_lookup_block_group(info,
1580 ret = find_search_start(root, &block_group, &search_start,
1581 total_needed, data);
1582 if (ret == -ENOSPC && last_ptr && *last_ptr) {
1584 block_group = btrfs_lookup_block_group(info,
1586 search_start = orig_search_start;
1587 ret = find_search_start(root, &block_group, &search_start,
1588 total_needed, data);
1595 if (last_ptr && *last_ptr && search_start != *last_ptr) {
1598 empty_size += empty_cluster;
1599 total_needed += empty_size;
1601 block_group = btrfs_lookup_block_group(info,
1603 search_start = orig_search_start;
1604 ret = find_search_start(root, &block_group,
1605 &search_start, total_needed, data);
1612 search_start = stripe_align(root, search_start);
1613 ins->objectid = search_start;
1614 ins->offset = num_bytes;
1616 if (ins->objectid + num_bytes >= search_end)
1619 if (ins->objectid + num_bytes >
1620 block_group->key.objectid + block_group->key.offset) {
1621 search_start = block_group->key.objectid +
1622 block_group->key.offset;
1626 if (test_range_bit(&info->extent_ins, ins->objectid,
1627 ins->objectid + num_bytes -1, EXTENT_LOCKED, 0)) {
1628 search_start = ins->objectid + num_bytes;
1632 if (test_range_bit(&info->pinned_extents, ins->objectid,
1633 ins->objectid + num_bytes -1, EXTENT_DIRTY, 0)) {
1634 search_start = ins->objectid + num_bytes;
1638 if (exclude_nr > 0 && (ins->objectid + num_bytes > exclude_start &&
1639 ins->objectid < exclude_start + exclude_nr)) {
1640 search_start = exclude_start + exclude_nr;
1644 if (!(data & BTRFS_BLOCK_GROUP_DATA)) {
1645 block_group = btrfs_lookup_block_group(info, ins->objectid);
1647 trans->block_group = block_group;
1649 ins->offset = num_bytes;
1651 *last_ptr = ins->objectid + ins->offset;
1653 btrfs_super_total_bytes(&root->fs_info->super_copy)) {
1660 if (search_start + num_bytes >= search_end) {
1662 search_start = orig_search_start;
1669 total_needed -= empty_size;
1674 block_group = btrfs_lookup_block_group(info, search_start);
1676 block_group = btrfs_find_block_group(root, block_group,
1677 search_start, data, 0);
1684 * finds a free extent and does all the dirty work required for allocation
1685 * returns the key for the extent through ins, and a tree buffer for
1686 * the first block of the extent through buf.
1688 * returns 0 if everything worked, non-zero otherwise.
1690 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1691 struct btrfs_root *root,
1692 u64 num_bytes, u64 min_alloc_size,
1693 u64 root_objectid, u64 ref_generation,
1694 u64 owner, u64 owner_offset,
1695 u64 empty_size, u64 hint_byte,
1696 u64 search_end, struct btrfs_key *ins, int data)
1702 u64 search_start = 0;
1706 struct btrfs_fs_info *info = root->fs_info;
1707 struct btrfs_root *extent_root = info->extent_root;
1708 struct btrfs_extent_item *extent_item;
1709 struct btrfs_extent_ref *ref;
1710 struct btrfs_path *path;
1711 struct btrfs_key keys[2];
1714 alloc_profile = info->avail_data_alloc_bits &
1715 info->data_alloc_profile;
1716 data = BTRFS_BLOCK_GROUP_DATA | alloc_profile;
1717 } else if (root == root->fs_info->chunk_root) {
1718 alloc_profile = info->avail_system_alloc_bits &
1719 info->system_alloc_profile;
1720 data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile;
1722 alloc_profile = info->avail_metadata_alloc_bits &
1723 info->metadata_alloc_profile;
1724 data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
1727 if (root->ref_cows) {
1728 if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
1729 ret = do_chunk_alloc(trans, root->fs_info->extent_root,
1731 BTRFS_BLOCK_GROUP_METADATA |
1732 (info->metadata_alloc_profile &
1733 info->avail_metadata_alloc_bits));
1736 ret = do_chunk_alloc(trans, root->fs_info->extent_root,
1737 num_bytes + 2 * 1024 * 1024, data);
1741 new_hint = max(hint_byte, root->fs_info->alloc_start);
1742 if (new_hint < btrfs_super_total_bytes(&info->super_copy))
1743 hint_byte = new_hint;
1745 WARN_ON(num_bytes < root->sectorsize);
1746 ret = find_free_extent(trans, root, num_bytes, empty_size,
1747 search_start, search_end, hint_byte, ins,
1748 trans->alloc_exclude_start,
1749 trans->alloc_exclude_nr, data);
1751 if (ret == -ENOSPC && num_bytes > min_alloc_size) {
1752 num_bytes = num_bytes >> 1;
1753 num_bytes = max(num_bytes, min_alloc_size);
1760 /* block accounting for super block */
1761 super_used = btrfs_super_bytes_used(&info->super_copy);
1762 btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes);
1764 /* block accounting for root item */
1765 root_used = btrfs_root_used(&root->root_item);
1766 btrfs_set_root_used(&root->root_item, root_used + num_bytes);
1768 clear_extent_dirty(&root->fs_info->free_space_cache,
1769 ins->objectid, ins->objectid + ins->offset - 1,
1772 if (root == extent_root) {
1773 set_extent_bits(&root->fs_info->extent_ins, ins->objectid,
1774 ins->objectid + ins->offset - 1,
1775 EXTENT_LOCKED, GFP_NOFS);
1779 WARN_ON(trans->alloc_exclude_nr);
1780 trans->alloc_exclude_start = ins->objectid;
1781 trans->alloc_exclude_nr = ins->offset;
1783 memcpy(&keys[0], ins, sizeof(*ins));
1784 keys[1].offset = hash_extent_ref(root_objectid, ref_generation,
1785 owner, owner_offset);
1786 keys[1].objectid = ins->objectid;
1787 keys[1].type = BTRFS_EXTENT_REF_KEY;
1788 sizes[0] = sizeof(*extent_item);
1789 sizes[1] = sizeof(*ref);
1791 path = btrfs_alloc_path();
1794 ret = btrfs_insert_empty_items(trans, extent_root, path, keys,
1798 extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1799 struct btrfs_extent_item);
1800 btrfs_set_extent_refs(path->nodes[0], extent_item, 1);
1801 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1802 struct btrfs_extent_ref);
1804 btrfs_set_ref_root(path->nodes[0], ref, root_objectid);
1805 btrfs_set_ref_generation(path->nodes[0], ref, ref_generation);
1806 btrfs_set_ref_objectid(path->nodes[0], ref, owner);
1807 btrfs_set_ref_offset(path->nodes[0], ref, owner_offset);
1809 btrfs_mark_buffer_dirty(path->nodes[0]);
1811 trans->alloc_exclude_start = 0;
1812 trans->alloc_exclude_nr = 0;
1813 btrfs_free_path(path);
1814 finish_current_insert(trans, extent_root);
1815 pending_ret = del_pending_extents(trans, extent_root);
1825 ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0);
1827 printk("update block group failed for %Lu %Lu\n",
1828 ins->objectid, ins->offset);
1835 * helper function to allocate a block for a given tree
1836 * returns the tree buffer or NULL.
1838 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1839 struct btrfs_root *root,
1841 u64 root_objectid, u64 hint,
1847 ref_generation = trans->transid;
1852 return __btrfs_alloc_free_block(trans, root, blocksize, root_objectid,
1853 ref_generation, 0, 0, hint, empty_size);
1857 * helper function to allocate a block for a given tree
1858 * returns the tree buffer or NULL.
1860 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1861 struct btrfs_root *root,
1870 struct btrfs_key ins;
1872 struct extent_buffer *buf;
1874 ret = btrfs_alloc_extent(trans, root, blocksize, blocksize,
1875 root_objectid, ref_generation,
1876 level, first_objectid, empty_size, hint,
1880 return ERR_PTR(ret);
1882 buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize);
1884 btrfs_free_extent(trans, root, ins.objectid, blocksize,
1885 root->root_key.objectid, ref_generation,
1887 return ERR_PTR(-ENOMEM);
1889 btrfs_set_header_generation(buf, trans->transid);
1890 clean_tree_block(trans, root, buf);
1891 btrfs_set_buffer_uptodate(buf);
1893 if (PageDirty(buf->first_page)) {
1894 printk("page %lu dirty\n", buf->first_page->index);
1898 set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
1899 buf->start + buf->len - 1, GFP_NOFS);
1900 if (!btrfs_test_opt(root, SSD))
1901 btrfs_set_buffer_defrag(buf);
1902 trans->blocks_used++;
1906 static int noinline drop_leaf_ref(struct btrfs_trans_handle *trans,
1907 struct btrfs_root *root,
1908 struct extent_buffer *leaf)
1911 u64 leaf_generation;
1912 struct btrfs_key key;
1913 struct btrfs_file_extent_item *fi;
1918 BUG_ON(!btrfs_is_leaf(leaf));
1919 nritems = btrfs_header_nritems(leaf);
1920 leaf_owner = btrfs_header_owner(leaf);
1921 leaf_generation = btrfs_header_generation(leaf);
1923 for (i = 0; i < nritems; i++) {
1926 btrfs_item_key_to_cpu(leaf, &key, i);
1927 if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
1929 fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
1930 if (btrfs_file_extent_type(leaf, fi) ==
1931 BTRFS_FILE_EXTENT_INLINE)
1934 * FIXME make sure to insert a trans record that
1935 * repeats the snapshot del on crash
1937 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
1938 if (disk_bytenr == 0)
1940 ret = btrfs_free_extent(trans, root, disk_bytenr,
1941 btrfs_file_extent_disk_num_bytes(leaf, fi),
1942 leaf_owner, leaf_generation,
1943 key.objectid, key.offset, 0);
1949 static void noinline reada_walk_down(struct btrfs_root *root,
1950 struct extent_buffer *node,
1963 nritems = btrfs_header_nritems(node);
1964 level = btrfs_header_level(node);
1968 for (i = slot; i < nritems && skipped < 32; i++) {
1969 bytenr = btrfs_node_blockptr(node, i);
1970 if (last && ((bytenr > last && bytenr - last > 32 * 1024) ||
1971 (last > bytenr && last - bytenr > 32 * 1024))) {
1975 blocksize = btrfs_level_size(root, level - 1);
1977 ret = lookup_extent_ref(NULL, root, bytenr,
1985 mutex_unlock(&root->fs_info->fs_mutex);
1986 ret = readahead_tree_block(root, bytenr, blocksize);
1987 last = bytenr + blocksize;
1989 mutex_lock(&root->fs_info->fs_mutex);
1996 * helper function for drop_snapshot, this walks down the tree dropping ref
1997 * counts as it goes.
1999 static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
2000 struct btrfs_root *root,
2001 struct btrfs_path *path, int *level)
2006 struct extent_buffer *next;
2007 struct extent_buffer *cur;
2008 struct extent_buffer *parent;
2013 WARN_ON(*level < 0);
2014 WARN_ON(*level >= BTRFS_MAX_LEVEL);
2015 ret = lookup_extent_ref(trans, root,
2016 path->nodes[*level]->start,
2017 path->nodes[*level]->len, &refs);
2023 * walk down to the last node level and free all the leaves
2025 while(*level >= 0) {
2026 WARN_ON(*level < 0);
2027 WARN_ON(*level >= BTRFS_MAX_LEVEL);
2028 cur = path->nodes[*level];
2030 if (btrfs_header_level(cur) != *level)
2033 if (path->slots[*level] >=
2034 btrfs_header_nritems(cur))
2037 ret = drop_leaf_ref(trans, root, cur);
2041 bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
2042 blocksize = btrfs_level_size(root, *level - 1);
2043 ret = lookup_extent_ref(trans, root, bytenr, blocksize, &refs);
2046 parent = path->nodes[*level];
2047 root_owner = btrfs_header_owner(parent);
2048 root_gen = btrfs_header_generation(parent);
2049 path->slots[*level]++;
2050 ret = btrfs_free_extent(trans, root, bytenr,
2051 blocksize, root_owner,
2056 next = btrfs_find_tree_block(root, bytenr, blocksize);
2057 if (!next || !btrfs_buffer_uptodate(next)) {
2058 free_extent_buffer(next);
2059 reada_walk_down(root, cur, path->slots[*level]);
2061 mutex_unlock(&root->fs_info->fs_mutex);
2062 next = read_tree_block(root, bytenr, blocksize);
2063 mutex_lock(&root->fs_info->fs_mutex);
2065 /* we've dropped the lock, double check */
2066 ret = lookup_extent_ref(trans, root, bytenr,
2070 parent = path->nodes[*level];
2071 root_owner = btrfs_header_owner(parent);
2072 root_gen = btrfs_header_generation(parent);
2074 path->slots[*level]++;
2075 free_extent_buffer(next);
2076 ret = btrfs_free_extent(trans, root, bytenr,
2084 btrfs_verify_block_csum(root, next);
2086 WARN_ON(*level <= 0);
2087 if (path->nodes[*level-1])
2088 free_extent_buffer(path->nodes[*level-1]);
2089 path->nodes[*level-1] = next;
2090 *level = btrfs_header_level(next);
2091 path->slots[*level] = 0;
2094 WARN_ON(*level < 0);
2095 WARN_ON(*level >= BTRFS_MAX_LEVEL);
2097 if (path->nodes[*level] == root->node) {
2098 root_owner = root->root_key.objectid;
2099 parent = path->nodes[*level];
2101 parent = path->nodes[*level + 1];
2102 root_owner = btrfs_header_owner(parent);
2105 root_gen = btrfs_header_generation(parent);
2106 ret = btrfs_free_extent(trans, root, path->nodes[*level]->start,
2107 path->nodes[*level]->len,
2108 root_owner, root_gen, 0, 0, 1);
2109 free_extent_buffer(path->nodes[*level]);
2110 path->nodes[*level] = NULL;
2117 * helper for dropping snapshots. This walks back up the tree in the path
2118 * to find the first node higher up where we haven't yet gone through
2121 static int noinline walk_up_tree(struct btrfs_trans_handle *trans,
2122 struct btrfs_root *root,
2123 struct btrfs_path *path, int *level)
2127 struct btrfs_root_item *root_item = &root->root_item;
2132 for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
2133 slot = path->slots[i];
2134 if (slot < btrfs_header_nritems(path->nodes[i]) - 1) {
2135 struct extent_buffer *node;
2136 struct btrfs_disk_key disk_key;
2137 node = path->nodes[i];
2140 WARN_ON(*level == 0);
2141 btrfs_node_key(node, &disk_key, path->slots[i]);
2142 memcpy(&root_item->drop_progress,
2143 &disk_key, sizeof(disk_key));
2144 root_item->drop_level = i;
2147 if (path->nodes[*level] == root->node) {
2148 root_owner = root->root_key.objectid;
2150 btrfs_header_generation(path->nodes[*level]);
2152 struct extent_buffer *node;
2153 node = path->nodes[*level + 1];
2154 root_owner = btrfs_header_owner(node);
2155 root_gen = btrfs_header_generation(node);
2157 ret = btrfs_free_extent(trans, root,
2158 path->nodes[*level]->start,
2159 path->nodes[*level]->len,
2160 root_owner, root_gen, 0, 0, 1);
2162 free_extent_buffer(path->nodes[*level]);
2163 path->nodes[*level] = NULL;
2171 * drop the reference count on the tree rooted at 'snap'. This traverses
2172 * the tree freeing any blocks that have a ref count of zero after being
2175 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
2181 struct btrfs_path *path;
2184 struct btrfs_root_item *root_item = &root->root_item;
2186 path = btrfs_alloc_path();
2189 level = btrfs_header_level(root->node);
2191 if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) {
2192 path->nodes[level] = root->node;
2193 extent_buffer_get(root->node);
2194 path->slots[level] = 0;
2196 struct btrfs_key key;
2197 struct btrfs_disk_key found_key;
2198 struct extent_buffer *node;
2200 btrfs_disk_key_to_cpu(&key, &root_item->drop_progress);
2201 level = root_item->drop_level;
2202 path->lowest_level = level;
2203 wret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2208 node = path->nodes[level];
2209 btrfs_node_key(node, &found_key, path->slots[level]);
2210 WARN_ON(memcmp(&found_key, &root_item->drop_progress,
2211 sizeof(found_key)));
2214 wret = walk_down_tree(trans, root, path, &level);
2220 wret = walk_up_tree(trans, root, path, &level);
2228 for (i = 0; i <= orig_level; i++) {
2229 if (path->nodes[i]) {
2230 free_extent_buffer(path->nodes[i]);
2231 path->nodes[i] = NULL;
2235 btrfs_free_path(path);
2239 int btrfs_free_block_groups(struct btrfs_fs_info *info)
2246 ret = find_first_extent_bit(&info->block_group_cache, 0,
2247 &start, &end, (unsigned int)-1);
2250 ret = get_state_private(&info->block_group_cache, start, &ptr);
2252 kfree((void *)(unsigned long)ptr);
2253 clear_extent_bits(&info->block_group_cache, start,
2254 end, (unsigned int)-1, GFP_NOFS);
2257 ret = find_first_extent_bit(&info->free_space_cache, 0,
2258 &start, &end, EXTENT_DIRTY);
2261 clear_extent_dirty(&info->free_space_cache, start,
2267 static int noinline relocate_inode_pages(struct inode *inode, u64 start,
2273 u64 existing_delalloc;
2274 unsigned long last_index;
2277 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2278 struct file_ra_state *ra;
2280 ra = kzalloc(sizeof(*ra), GFP_NOFS);
2282 mutex_lock(&inode->i_mutex);
2283 i = start >> PAGE_CACHE_SHIFT;
2284 last_index = (start + len - 1) >> PAGE_CACHE_SHIFT;
2286 file_ra_state_init(ra, inode->i_mapping);
2287 btrfs_force_ra(inode->i_mapping, ra, NULL, i, last_index);
2290 for (; i <= last_index; i++) {
2291 page = grab_cache_page(inode->i_mapping, i);
2294 if (!PageUptodate(page)) {
2295 btrfs_readpage(NULL, page);
2297 if (!PageUptodate(page)) {
2299 page_cache_release(page);
2303 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2304 page_end = page_start + PAGE_CACHE_SIZE - 1;
2306 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
2308 delalloc_start = page_start;
2309 existing_delalloc = count_range_bits(io_tree,
2310 &delalloc_start, page_end,
2311 PAGE_CACHE_SIZE, EXTENT_DELALLOC);
2313 set_extent_delalloc(io_tree, page_start,
2314 page_end, GFP_NOFS);
2316 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
2317 set_page_dirty(page);
2319 page_cache_release(page);
2323 mutex_unlock(&inode->i_mutex);
2328 * note, this releases the path
2330 static int noinline relocate_one_reference(struct btrfs_root *extent_root,
2331 struct btrfs_path *path,
2332 struct btrfs_key *extent_key)
2334 struct inode *inode;
2335 struct btrfs_root *found_root;
2336 struct btrfs_key *root_location;
2337 struct btrfs_extent_ref *ref;
2344 ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
2345 struct btrfs_extent_ref);
2346 ref_root = btrfs_ref_root(path->nodes[0], ref);
2347 ref_gen = btrfs_ref_generation(path->nodes[0], ref);
2348 ref_objectid = btrfs_ref_objectid(path->nodes[0], ref);
2349 ref_offset = btrfs_ref_offset(path->nodes[0], ref);
2350 btrfs_release_path(extent_root, path);
2352 root_location = kmalloc(sizeof(*root_location), GFP_NOFS);
2353 root_location->objectid = ref_root;
2355 root_location->offset = 0;
2357 root_location->offset = (u64)-1;
2358 root_location->type = BTRFS_ROOT_ITEM_KEY;
2360 found_root = btrfs_read_fs_root_no_name(extent_root->fs_info,
2362 BUG_ON(!found_root);
2363 kfree(root_location);
2365 if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
2366 mutex_unlock(&extent_root->fs_info->fs_mutex);
2367 inode = btrfs_iget_locked(extent_root->fs_info->sb,
2368 ref_objectid, found_root);
2369 if (inode->i_state & I_NEW) {
2370 /* the inode and parent dir are two different roots */
2371 BTRFS_I(inode)->root = found_root;
2372 BTRFS_I(inode)->location.objectid = ref_objectid;
2373 BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
2374 BTRFS_I(inode)->location.offset = 0;
2375 btrfs_read_locked_inode(inode);
2376 unlock_new_inode(inode);
2379 /* this can happen if the reference is not against
2380 * the latest version of the tree root
2382 if (is_bad_inode(inode)) {
2383 mutex_lock(&extent_root->fs_info->fs_mutex);
2386 relocate_inode_pages(inode, ref_offset, extent_key->offset);
2387 /* FIXME, data=ordered will help get rid of this */
2388 filemap_fdatawrite(inode->i_mapping);
2390 mutex_lock(&extent_root->fs_info->fs_mutex);
2392 struct btrfs_trans_handle *trans;
2393 struct btrfs_key found_key;
2394 struct extent_buffer *eb;
2398 trans = btrfs_start_transaction(found_root, 1);
2399 eb = read_tree_block(found_root, extent_key->objectid,
2400 extent_key->offset);
2401 level = btrfs_header_level(eb);
2404 btrfs_item_key_to_cpu(eb, &found_key, 0);
2406 btrfs_node_key_to_cpu(eb, &found_key, 0);
2408 free_extent_buffer(eb);
2410 path->lowest_level = level;
2412 ret = btrfs_search_slot(trans, found_root, &found_key, path,
2414 path->lowest_level = 0;
2415 for (i = level; i < BTRFS_MAX_LEVEL; i++) {
2416 if (!path->nodes[i])
2418 free_extent_buffer(path->nodes[i]);
2419 path->nodes[i] = NULL;
2421 btrfs_release_path(found_root, path);
2422 btrfs_end_transaction(trans, found_root);
2429 static int noinline relocate_one_extent(struct btrfs_root *extent_root,
2430 struct btrfs_path *path,
2431 struct btrfs_key *extent_key)
2433 struct btrfs_key key;
2434 struct btrfs_key found_key;
2435 struct extent_buffer *leaf;
2440 key.objectid = extent_key->objectid;
2441 key.type = BTRFS_EXTENT_REF_KEY;
2445 ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
2451 leaf = path->nodes[0];
2452 nritems = btrfs_header_nritems(leaf);
2453 if (path->slots[0] == nritems)
2456 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2457 if (found_key.objectid != extent_key->objectid)
2460 if (found_key.type != BTRFS_EXTENT_REF_KEY)
2463 key.offset = found_key.offset + 1;
2464 item_size = btrfs_item_size_nr(leaf, path->slots[0]);
2466 ret = relocate_one_reference(extent_root, path, extent_key);
2472 btrfs_release_path(extent_root, path);
2476 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size)
2478 struct btrfs_trans_handle *trans;
2479 struct btrfs_root *tree_root = root->fs_info->tree_root;
2480 struct btrfs_path *path;
2483 struct btrfs_fs_info *info = root->fs_info;
2484 struct extent_io_tree *block_group_cache;
2485 struct btrfs_key key;
2486 struct btrfs_key found_key;
2487 struct extent_buffer *leaf;
2492 btrfs_set_super_total_bytes(&info->super_copy, new_size);
2493 clear_extent_dirty(&info->free_space_cache, new_size, (u64)-1,
2495 block_group_cache = &info->block_group_cache;
2496 path = btrfs_alloc_path();
2497 root = root->fs_info->extent_root;
2502 key.objectid = new_size;
2505 cur_byte = key.objectid;
2507 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2511 ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY);
2515 leaf = path->nodes[0];
2516 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2517 if (found_key.objectid + found_key.offset > new_size) {
2518 cur_byte = found_key.objectid;
2519 key.objectid = cur_byte;
2522 btrfs_release_path(root, path);
2525 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2529 leaf = path->nodes[0];
2530 nritems = btrfs_header_nritems(leaf);
2532 if (path->slots[0] >= nritems) {
2533 ret = btrfs_next_leaf(root, path);
2540 leaf = path->nodes[0];
2541 nritems = btrfs_header_nritems(leaf);
2544 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2546 if (progress && need_resched()) {
2547 memcpy(&key, &found_key, sizeof(key));
2548 mutex_unlock(&root->fs_info->fs_mutex);
2550 mutex_lock(&root->fs_info->fs_mutex);
2551 btrfs_release_path(root, path);
2552 btrfs_search_slot(NULL, root, &key, path, 0, 0);
2558 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_ITEM_KEY ||
2559 found_key.objectid + found_key.offset <= cur_byte) {
2565 cur_byte = found_key.objectid + found_key.offset;
2566 key.objectid = cur_byte;
2567 btrfs_release_path(root, path);
2568 ret = relocate_one_extent(root, path, &found_key);
2571 btrfs_release_path(root, path);
2573 if (total_found > 0) {
2574 trans = btrfs_start_transaction(tree_root, 1);
2575 btrfs_commit_transaction(trans, tree_root);
2577 mutex_unlock(&root->fs_info->fs_mutex);
2578 btrfs_clean_old_snapshots(tree_root);
2579 mutex_lock(&root->fs_info->fs_mutex);
2581 trans = btrfs_start_transaction(tree_root, 1);
2582 btrfs_commit_transaction(trans, tree_root);
2586 trans = btrfs_start_transaction(root, 1);
2587 key.objectid = new_size;
2593 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
2597 leaf = path->nodes[0];
2598 nritems = btrfs_header_nritems(leaf);
2600 if (path->slots[0] >= nritems) {
2601 ret = btrfs_next_leaf(root, path);
2608 leaf = path->nodes[0];
2609 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2612 * btrfs_next_leaf doesn't cow buffers, we have to
2613 * do the search again
2615 memcpy(&key, &found_key, sizeof(key));
2616 btrfs_release_path(root, path);
2620 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2621 if (btrfs_key_type(&found_key) != BTRFS_BLOCK_GROUP_ITEM_KEY) {
2622 printk("shrinker found key %Lu %u %Lu\n",
2623 found_key.objectid, found_key.type,
2628 ret = get_state_private(&info->block_group_cache,
2629 found_key.objectid, &ptr);
2631 kfree((void *)(unsigned long)ptr);
2633 clear_extent_bits(&info->block_group_cache, found_key.objectid,
2634 found_key.objectid + found_key.offset - 1,
2635 (unsigned int)-1, GFP_NOFS);
2637 key.objectid = found_key.objectid + 1;
2638 btrfs_del_item(trans, root, path);
2639 btrfs_release_path(root, path);
2641 if (need_resched()) {
2642 mutex_unlock(&root->fs_info->fs_mutex);
2644 mutex_lock(&root->fs_info->fs_mutex);
2647 clear_extent_dirty(&info->free_space_cache, new_size, (u64)-1,
2649 btrfs_commit_transaction(trans, root);
2651 btrfs_free_path(path);
2655 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
2656 struct btrfs_root *root, u64 new_size)
2658 btrfs_set_super_total_bytes(&root->fs_info->super_copy, new_size);
2662 int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path,
2663 struct btrfs_key *key)
2666 struct btrfs_key found_key;
2667 struct extent_buffer *leaf;
2670 ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
2674 slot = path->slots[0];
2675 leaf = path->nodes[0];
2676 if (slot >= btrfs_header_nritems(leaf)) {
2677 ret = btrfs_next_leaf(root, path);
2684 btrfs_item_key_to_cpu(leaf, &found_key, slot);
2686 if (found_key.objectid >= key->objectid &&
2687 found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY)
2696 int btrfs_read_block_groups(struct btrfs_root *root)
2698 struct btrfs_path *path;
2701 struct btrfs_block_group_cache *cache;
2702 struct btrfs_fs_info *info = root->fs_info;
2703 struct btrfs_space_info *space_info;
2704 struct extent_io_tree *block_group_cache;
2705 struct btrfs_key key;
2706 struct btrfs_key found_key;
2707 struct extent_buffer *leaf;
2709 block_group_cache = &info->block_group_cache;
2710 root = info->extent_root;
2713 btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY);
2714 path = btrfs_alloc_path();
2719 ret = find_first_block_group(root, path, &key);
2727 leaf = path->nodes[0];
2728 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2729 cache = kmalloc(sizeof(*cache), GFP_NOFS);
2735 read_extent_buffer(leaf, &cache->item,
2736 btrfs_item_ptr_offset(leaf, path->slots[0]),
2737 sizeof(cache->item));
2738 memcpy(&cache->key, &found_key, sizeof(found_key));
2742 key.objectid = found_key.objectid + found_key.offset;
2743 btrfs_release_path(root, path);
2744 cache->flags = btrfs_block_group_flags(&cache->item);
2746 if (cache->flags & BTRFS_BLOCK_GROUP_DATA) {
2747 bit = BLOCK_GROUP_DATA;
2748 } else if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2749 bit = BLOCK_GROUP_SYSTEM;
2750 } else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) {
2751 bit = BLOCK_GROUP_METADATA;
2753 set_avail_alloc_bits(info, cache->flags);
2755 ret = update_space_info(info, cache->flags, found_key.offset,
2756 btrfs_block_group_used(&cache->item),
2759 cache->space_info = space_info;
2761 /* use EXTENT_LOCKED to prevent merging */
2762 set_extent_bits(block_group_cache, found_key.objectid,
2763 found_key.objectid + found_key.offset - 1,
2764 bit | EXTENT_LOCKED, GFP_NOFS);
2765 set_state_private(block_group_cache, found_key.objectid,
2766 (unsigned long)cache);
2769 btrfs_super_total_bytes(&info->super_copy))
2774 btrfs_free_path(path);
2778 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2779 struct btrfs_root *root, u64 bytes_used,
2780 u64 type, u64 chunk_objectid, u64 chunk_offset,
2785 struct btrfs_root *extent_root;
2786 struct btrfs_block_group_cache *cache;
2787 struct extent_io_tree *block_group_cache;
2789 extent_root = root->fs_info->extent_root;
2790 block_group_cache = &root->fs_info->block_group_cache;
2792 cache = kmalloc(sizeof(*cache), GFP_NOFS);
2794 cache->key.objectid = chunk_offset;
2795 cache->key.offset = size;
2799 btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY);
2800 memset(&cache->item, 0, sizeof(cache->item));
2801 btrfs_set_block_group_used(&cache->item, bytes_used);
2802 btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid);
2803 cache->flags = type;
2804 btrfs_set_block_group_flags(&cache->item, type);
2806 ret = update_space_info(root->fs_info, cache->flags, size, bytes_used,
2807 &cache->space_info);
2810 bit = block_group_state_bits(type);
2811 set_extent_bits(block_group_cache, chunk_offset,
2812 chunk_offset + size - 1,
2813 bit | EXTENT_LOCKED, GFP_NOFS);
2815 set_state_private(block_group_cache, chunk_offset,
2816 (unsigned long)cache);
2817 ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item,
2818 sizeof(cache->item));
2821 finish_current_insert(trans, extent_root);
2822 ret = del_pending_extents(trans, extent_root);
2824 set_avail_alloc_bits(extent_root->fs_info, type);