korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 12:28:41 +08:00
Code Issues Packages Projects Releases Wiki Activity

btrfs: stop accessing ->extent_root directly

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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)