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btrfs: stop accessing ->extent_root directly

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When we start having multiple extent roots we'll need to use a helper to
get to the correct extent_root.  Rename fs_info->extent_root to
_extent_root and convert all of the users of the extent root to using
the btrfs_extent_root() helper.  This will allow us to easily clean up
the remaining direct accesses in the future.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2021-11-05 16:45:45 -04:00 committed by David Sterba
parent 2e608bd1dd
commit 29cbcf4017
16 changed files with 77 additions and 44 deletions
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16
fs/btrfs/backref.c
View File

@ -1170,7 +1170,7 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
struct ulist *roots, const u64 *extent_item_pos,
struct share_check *sc, bool ignore_offset)
{
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_root *root = btrfs_extent_root(fs_info, bytenr);
struct btrfs_key key;
struct btrfs_path *path;
struct btrfs_delayed_ref_root *delayed_refs = NULL;
@ -1747,6 +1747,7 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
struct btrfs_path *path, struct btrfs_key *found_key,
u64 *flags_ret)
{
struct btrfs_root *extent_root = btrfs_extent_root(fs_info, logical);
int ret;
u64 flags;
u64 size = 0;
@ -1762,11 +1763,11 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
key.objectid = logical;
key.offset = (u64)-1;
ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, path, 0, 0);
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0)
return ret;
ret = btrfs_previous_extent_item(fs_info->extent_root, path, 0);
ret = btrfs_previous_extent_item(extent_root, path, 0);
if (ret) {
if (ret > 0)
ret = -ENOENT;
@ -2335,6 +2336,7 @@ struct btrfs_backref_iter *btrfs_backref_iter_alloc(
int btrfs_backref_iter_start(struct btrfs_backref_iter *iter, u64 bytenr)
{
struct btrfs_fs_info *fs_info = iter->fs_info;
struct btrfs_root *extent_root = btrfs_extent_root(fs_info, bytenr);
struct btrfs_path *path = iter->path;
struct btrfs_extent_item *ei;
struct btrfs_key key;
@ -2345,7 +2347,7 @@ int btrfs_backref_iter_start(struct btrfs_backref_iter *iter, u64 bytenr)
key.offset = (u64)-1;
iter->bytenr = bytenr;
ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, path, 0, 0);
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0)
return ret;
if (ret == 0) {
@ -2388,7 +2390,7 @@ int btrfs_backref_iter_start(struct btrfs_backref_iter *iter, u64 bytenr)
/* If there is no inline backref, go search for keyed backref */
if (iter->cur_ptr >= iter->end_ptr) {
ret = btrfs_next_item(fs_info->extent_root, path);
ret = btrfs_next_item(extent_root, path);
/* No inline nor keyed ref */
if (ret > 0) {
@ -2432,6 +2434,7 @@ release:
int btrfs_backref_iter_next(struct btrfs_backref_iter *iter)
{
struct extent_buffer *eb = btrfs_backref_get_eb(iter);
struct btrfs_root *extent_root;
struct btrfs_path *path = iter->path;
struct btrfs_extent_inline_ref *iref;
int ret;
@ -2462,7 +2465,8 @@ int btrfs_backref_iter_next(struct btrfs_backref_iter *iter)
}
/* We're at keyed items, there is no inline item, go to the next one */
ret = btrfs_next_item(iter->fs_info->extent_root, iter->path);
extent_root = btrfs_extent_root(iter->fs_info, iter->bytenr);
ret = btrfs_next_item(extent_root, iter->path);
if (ret)
return ret;

3
fs/btrfs/block-group.c
View File

@ -514,7 +514,7 @@ static int load_extent_tree_free(struct btrfs_caching_control *caching_ctl)
{
struct btrfs_block_group *block_group = caching_ctl->block_group;
struct btrfs_fs_info *fs_info = block_group->fs_info;
struct btrfs_root *extent_root = fs_info->extent_root;
struct btrfs_root *extent_root;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_key key;
@ -529,6 +529,7 @@ static int load_extent_tree_free(struct btrfs_caching_control *caching_ctl)
return -ENOMEM;
last = max_t(u64, block_group->start, BTRFS_SUPER_INFO_OFFSET);
extent_root = btrfs_extent_root(fs_info, last);
#ifdef CONFIG_BTRFS_DEBUG
/*

4
fs/btrfs/block-rsv.c
View File

@ -6,6 +6,7 @@
#include "space-info.h"
#include "transaction.h"
#include "block-group.h"
#include "disk-io.h"
/*
* HOW DO BLOCK RESERVES WORK
@ -351,6 +352,7 @@ void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info)
{
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
struct btrfs_space_info *sinfo = block_rsv->space_info;
struct btrfs_root *extent_root = btrfs_extent_root(fs_info, 0);
u64 num_bytes;
unsigned min_items;
@ -359,7 +361,7 @@ void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info)
* checksum tree and the root tree. If the fs is empty we want to set
* it to a minimal amount for safety.
*/
num_bytes = btrfs_root_used(&fs_info->extent_root->root_item) +
num_bytes = btrfs_root_used(&extent_root->root_item) +
btrfs_root_used(&fs_info->csum_root->root_item) +
btrfs_root_used(&fs_info->tree_root->root_item);

2
fs/btrfs/ctree.h
View File

@ -621,7 +621,7 @@ enum btrfs_exclusive_operation {
struct btrfs_fs_info {
u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
unsigned long flags;
struct btrfs_root *extent_root;
struct btrfs_root *_extent_root;
struct btrfs_root *tree_root;
struct btrfs_root *chunk_root;
struct btrfs_root *dev_root;

15
fs/btrfs/disk-io.c
View File

@ -1557,7 +1557,7 @@ static struct btrfs_root *btrfs_get_global_root(struct btrfs_fs_info *fs_info,
if (objectid == BTRFS_ROOT_TREE_OBJECTID)
return btrfs_grab_root(fs_info->tree_root);
if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
return btrfs_grab_root(fs_info->extent_root);
return btrfs_grab_root(fs_info->_extent_root);
if (objectid == BTRFS_CHUNK_TREE_OBJECTID)
return btrfs_grab_root(fs_info->chunk_root);
if (objectid == BTRFS_DEV_TREE_OBJECTID)
@ -1630,7 +1630,7 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
btrfs_free_ref_cache(fs_info);
kfree(fs_info->balance_ctl);
kfree(fs_info->delayed_root);
btrfs_put_root(fs_info->extent_root);
btrfs_put_root(fs_info->_extent_root);
btrfs_put_root(fs_info->tree_root);
btrfs_put_root(fs_info->chunk_root);
btrfs_put_root(fs_info->dev_root);
@ -2008,6 +2008,7 @@ static void backup_super_roots(struct btrfs_fs_info *info)
{
const int next_backup = info->backup_root_index;
struct btrfs_root_backup *root_backup;
struct btrfs_root *extent_root = btrfs_extent_root(info, 0);
root_backup = info->super_for_commit->super_roots + next_backup;
@ -2032,11 +2033,11 @@ static void backup_super_roots(struct btrfs_fs_info *info)
btrfs_set_backup_chunk_root_level(root_backup,
btrfs_header_level(info->chunk_root->node));
btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start);
btrfs_set_backup_extent_root(root_backup, extent_root->node->start);
btrfs_set_backup_extent_root_gen(root_backup,
btrfs_header_generation(info->extent_root->node));
btrfs_header_generation(extent_root->node));
btrfs_set_backup_extent_root_level(root_backup,
btrfs_header_level(info->extent_root->node));
btrfs_header_level(extent_root->node));
/*
* we might commit during log recovery, which happens before we set
@ -2166,7 +2167,7 @@ static void free_root_pointers(struct btrfs_fs_info *info, bool free_chunk_root)
free_root_extent_buffers(info->tree_root);
free_root_extent_buffers(info->dev_root);
free_root_extent_buffers(info->extent_root);
free_root_extent_buffers(info->_extent_root);
free_root_extent_buffers(info->csum_root);
free_root_extent_buffers(info->quota_root);
free_root_extent_buffers(info->uuid_root);
@ -2456,7 +2457,7 @@ static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
}
} else {
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
fs_info->extent_root = root;
fs_info->_extent_root = root;
}
location.objectid = BTRFS_DEV_TREE_OBJECTID;

8
fs/btrfs/disk-io.h
View File

@ -103,9 +103,15 @@ static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
return NULL;
}
static inline struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info,
u64 bytenr)
{
return fs_info->_extent_root;
}
static inline struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info)
{
return fs_info->extent_root;
return btrfs_extent_root(fs_info, 0);
}
void btrfs_put_root(struct btrfs_root *root);

40
fs/btrfs/extent-tree.c
View File

@ -87,6 +87,7 @@ void btrfs_free_excluded_extents(struct btrfs_block_group *cache)
/* simple helper to search for an existing data extent at a given offset */
int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len)
{
struct btrfs_root *root = btrfs_extent_root(fs_info, start);
int ret;
struct btrfs_key key;
struct btrfs_path *path;
@ -98,7 +99,7 @@ int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len)
key.objectid = start;
key.offset = len;
key.type = BTRFS_EXTENT_ITEM_KEY;
ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, path, 0, 0);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
btrfs_free_path(path);
return ret;
}
@ -116,6 +117,7 @@ int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 bytenr,
u64 offset, int metadata, u64 *refs, u64 *flags)
{
struct btrfs_root *extent_root;
struct btrfs_delayed_ref_head *head;
struct btrfs_delayed_ref_root *delayed_refs;
struct btrfs_path *path;
@ -153,7 +155,8 @@ search_again:
else
key.type = BTRFS_EXTENT_ITEM_KEY;
ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, path, 0, 0);
extent_root = btrfs_extent_root(fs_info, bytenr);
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0)
goto out_free;
@ -443,7 +446,7 @@ static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans,
u64 root_objectid,
u64 owner, u64 offset)
{
struct btrfs_root *root = trans->fs_info->extent_root;
struct btrfs_root *root = btrfs_extent_root(trans->fs_info, bytenr);
struct btrfs_key key;
struct btrfs_extent_data_ref *ref;
struct extent_buffer *leaf;
@ -519,7 +522,7 @@ static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans,
u64 root_objectid, u64 owner,
u64 offset, int refs_to_add)
{
struct btrfs_root *root = trans->fs_info->extent_root;
struct btrfs_root *root = btrfs_extent_root(trans->fs_info, bytenr);
struct btrfs_key key;
struct extent_buffer *leaf;
u32 size;
@ -686,7 +689,7 @@ static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans,
u64 bytenr, u64 parent,
u64 root_objectid)
{
struct btrfs_root *root = trans->fs_info->extent_root;
struct btrfs_root *root = btrfs_extent_root(trans->fs_info, bytenr);
struct btrfs_key key;
int ret;
@ -710,6 +713,7 @@ static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans,
u64 bytenr, u64 parent,
u64 root_objectid)
{
struct btrfs_root *root = btrfs_extent_root(trans->fs_info, bytenr);
struct btrfs_key key;
int ret;
@ -722,8 +726,7 @@ static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans,
key.offset = root_objectid;
}
ret = btrfs_insert_empty_item(trans, trans->fs_info->extent_root,
path, &key, 0);
ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
btrfs_release_path(path);
return ret;
}
@ -788,7 +791,7 @@ int lookup_inline_extent_backref(struct btrfs_trans_handle *trans,
u64 owner, u64 offset, int insert)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_root *root = btrfs_extent_root(fs_info, bytenr);
struct btrfs_key key;
struct extent_buffer *leaf;
struct btrfs_extent_item *ei;
@ -1574,6 +1577,7 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
struct btrfs_delayed_extent_op *extent_op)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *root;
struct btrfs_key key;
struct btrfs_path *path;
struct btrfs_extent_item *ei;
@ -1603,8 +1607,9 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
key.offset = head->num_bytes;
}
root = btrfs_extent_root(fs_info, key.objectid);
again:
ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 1);
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0) {
err = ret;
goto out;
@ -2287,7 +2292,7 @@ static noinline int check_committed_ref(struct btrfs_root *root,
bool strict)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_root *extent_root = fs_info->extent_root;
struct btrfs_root *extent_root = btrfs_extent_root(fs_info, bytenr);
struct extent_buffer *leaf;
struct btrfs_extent_data_ref *ref;
struct btrfs_extent_inline_ref *iref;
@ -2922,7 +2927,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *info = trans->fs_info;
struct btrfs_key key;
struct btrfs_path *path;
struct btrfs_root *extent_root = info->extent_root;
struct btrfs_root *extent_root;
struct extent_buffer *leaf;
struct btrfs_extent_item *ei;
struct btrfs_extent_inline_ref *iref;
@ -2938,6 +2943,8 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
int last_ref = 0;
bool skinny_metadata = btrfs_fs_incompat(info, SKINNY_METADATA);
extent_root = btrfs_extent_root(info, bytenr);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@ -4572,6 +4579,7 @@ static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_key *ins, int ref_mod)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *extent_root;
int ret;
struct btrfs_extent_item *extent_item;
struct btrfs_extent_inline_ref *iref;
@ -4591,8 +4599,8 @@ static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
if (!path)
return -ENOMEM;
ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path,
ins, size);
extent_root = btrfs_extent_root(fs_info, ins->objectid);
ret = btrfs_insert_empty_item(trans, extent_root, path, ins, size);
if (ret) {
btrfs_free_path(path);
return ret;
@ -4644,6 +4652,7 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_delayed_extent_op *extent_op)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *extent_root;
int ret;
struct btrfs_extent_item *extent_item;
struct btrfs_key extent_key;
@ -4675,8 +4684,9 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
if (!path)
return -ENOMEM;
ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path,
&extent_key, size);
extent_root = btrfs_extent_root(fs_info, extent_key.objectid);
ret = btrfs_insert_empty_item(trans, extent_root, path, &extent_key,
size);
if (ret) {
btrfs_free_path(path);
return ret;

3
fs/btrfs/free-space-tree.c
View File

@ -1046,7 +1046,7 @@ out:
static int populate_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group)
{
struct btrfs_root *extent_root = trans->fs_info->extent_root;
struct btrfs_root *extent_root;
struct btrfs_path *path, *path2;
struct btrfs_key key;
u64 start, end;
@ -1080,6 +1080,7 @@ static int populate_free_space_tree(struct btrfs_trans_handle *trans,
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = 0;
extent_root = btrfs_extent_root(trans->fs_info, key.objectid);
ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0);
if (ret < 0)
goto out_locked;

5
fs/btrfs/qgroup.c
View File

@ -3161,6 +3161,7 @@ static int qgroup_rescan_leaf(struct btrfs_trans_handle *trans,
struct btrfs_path *path)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_root *extent_root;
struct btrfs_key found;
struct extent_buffer *scratch_leaf = NULL;
struct ulist *roots = NULL;
@ -3170,7 +3171,9 @@ static int qgroup_rescan_leaf(struct btrfs_trans_handle *trans,
int ret;
mutex_lock(&fs_info->qgroup_rescan_lock);
ret = btrfs_search_slot_for_read(fs_info->extent_root,
extent_root = btrfs_extent_root(fs_info,
fs_info->qgroup_rescan_progress.objectid);
ret = btrfs_search_slot_for_read(extent_root,
&fs_info->qgroup_rescan_progress,
path, 1, 0);

6
fs/btrfs/ref-verify.c
View File

@ -972,6 +972,7 @@ void btrfs_free_ref_tree_range(struct btrfs_fs_info *fs_info, u64 start,
/* Walk down all roots and build the ref tree, meant to be called at mount */
int btrfs_build_ref_tree(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *extent_root;
struct btrfs_path *path;
struct extent_buffer *eb;
int tree_block_level = 0;
@ -985,7 +986,8 @@ int btrfs_build_ref_tree(struct btrfs_fs_info *fs_info)
if (!path)
return -ENOMEM;
eb = btrfs_read_lock_root_node(fs_info->extent_root);
extent_root = btrfs_extent_root(fs_info, 0);
eb = btrfs_read_lock_root_node(extent_root);
level = btrfs_header_level(eb);
path->nodes[level] = eb;
path->slots[level] = 0;
@ -998,7 +1000,7 @@ int btrfs_build_ref_tree(struct btrfs_fs_info *fs_info)
* would have had to added a ref key item which may appear on a
* different leaf from the original extent item.
*/
ret = walk_down_tree(fs_info->extent_root, path, level,
ret = walk_down_tree(extent_root, path, level,
&bytenr, &num_bytes, &tree_block_level);
if (ret)
break;

4
fs/btrfs/relocation.c
View File

@ -3964,7 +3964,7 @@ static const char *stage_to_string(int stage)
int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start)
{
struct btrfs_block_group *bg;
struct btrfs_root *extent_root = fs_info->extent_root;
struct btrfs_root *extent_root = btrfs_extent_root(fs_info, group_start);
struct reloc_control *rc;
struct inode *inode;
struct btrfs_path *path;
@ -4215,7 +4215,7 @@ int btrfs_recover_relocation(struct btrfs_root *root)
goto out_end;
}
rc->extent_root = fs_info->extent_root;
rc->extent_root = btrfs_extent_root(fs_info, 0);
set_reloc_control(rc);

6
fs/btrfs/scrub.c
View File

@ -2897,7 +2897,7 @@ static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx,
u64 logic_end)
{
struct btrfs_fs_info *fs_info = sctx->fs_info;
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_root *root = btrfs_extent_root(fs_info, logic_start);
struct btrfs_root *csum_root = fs_info->csum_root;
struct btrfs_extent_item *extent;
struct btrfs_io_context *bioc = NULL;
@ -3168,7 +3168,7 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
{
struct btrfs_path *path, *ppath;
struct btrfs_fs_info *fs_info = sctx->fs_info;
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_root *root;
struct btrfs_root *csum_root = fs_info->csum_root;
struct btrfs_extent_item *extent;
struct blk_plug plug;
@ -3262,6 +3262,8 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
atomic_read(&sctx->bios_in_flight) == 0);
scrub_blocked_if_needed(fs_info);
root = btrfs_extent_root(fs_info, logical);
/* FIXME it might be better to start readahead at commit root */
key.objectid = logical;
key.type = BTRFS_EXTENT_ITEM_KEY;

2
fs/btrfs/tests/free-space-tests.c
View File

@ -1036,7 +1036,7 @@ int btrfs_test_free_space_cache(u32 sectorsize, u32 nodesize)
goto out;
}
root->fs_info->extent_root = root;
root->fs_info->_extent_root = root;
ret = test_extents(cache);
if (ret)

2
fs/btrfs/tests/qgroup-tests.c
View File

@ -455,7 +455,7 @@ int btrfs_test_qgroups(u32 sectorsize, u32 nodesize)
}
/* We are using this root as our extent root */
root->fs_info->extent_root = root;
root->fs_info->_extent_root = root;
/*
* Some of the paths we test assume we have a filled out fs_info, so we

2
fs/btrfs/transaction.c
View File

@ -419,7 +419,7 @@ static int record_root_in_trans(struct btrfs_trans_handle *trans,
if ((test_bit(BTRFS_ROOT_SHAREABLE, &root->state) &&
root->last_trans < trans->transid) || force) {
WARN_ON(root == fs_info->extent_root);
WARN_ON(root == fs_info->_extent_root);
WARN_ON(!force && root->commit_root != root->node);
/*

3
fs/btrfs/zoned.c
View File

@ -1154,7 +1154,7 @@ static int calculate_alloc_pointer(struct btrfs_block_group *cache,
u64 *offset_ret)
{
struct btrfs_fs_info *fs_info = cache->fs_info;
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_root *root;
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_key found_key;
@ -1169,6 +1169,7 @@ static int calculate_alloc_pointer(struct btrfs_block_group *cache,
key.type = 0;
key.offset = 0;
root = btrfs_extent_root(fs_info, key.objectid);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
/* We should not find the exact match */
if (!ret)