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btrfs: Make btrfs_find_name_in_ext_backref return struct btrfs_inode_extref

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btrfs_find_name_in_ext_backref returns either 0/1 depending on whether it
found a backref for the given name. If it returns true then the actual
inode_ref struct is returned in one of its parameters. That's pointless,
instead refactor the function such that it returns either a pointer
to the btrfs_inode_extref or NULL it it didn't find anything. This
streamlines the function calling convention.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov
2019-08-27 14:46:29 +03:00
committed by David Sterba
parent 9bb8407f54
commit 6ff49c6ad2
3 changed files with 22 additions and 32 deletions
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33
fs/btrfs/inode-item.c
View File

@@ -34,10 +34,9 @@ struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
return NULL;
}
int btrfs_find_name_in_ext_backref(struct extent_buffer *leaf, int slot,
u64 ref_objectid,
const char *name, int name_len,
struct btrfs_inode_extref **extref_ret)
struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
struct extent_buffer *leaf, int slot, u64 ref_objectid,
const char *name, int name_len)
{
struct btrfs_inode_extref *extref;
unsigned long ptr;
@@ -62,15 +61,12 @@ int btrfs_find_name_in_ext_backref(struct extent_buffer *leaf, int slot,
if (ref_name_len == name_len &&
btrfs_inode_extref_parent(leaf, extref) == ref_objectid &&
(memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)) {
if (extref_ret)
*extref_ret = extref;
return 1;
}
(memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0))
return extref;
cur_offset += ref_name_len + sizeof(*extref);
}
return 0;
return NULL;
}
/* Returns NULL if no extref found */
@@ -84,7 +80,6 @@ btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
{
int ret;
struct btrfs_key key;
struct btrfs_inode_extref *extref;
key.objectid = inode_objectid;
key.type = BTRFS_INODE_EXTREF_KEY;
@@ -95,11 +90,9 @@ btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
return ERR_PTR(ret);
if (ret > 0)
return NULL;
if (!btrfs_find_name_in_ext_backref(path->nodes[0], path->slots[0],
ref_objectid, name, name_len,
&extref))
return NULL;
return extref;
return btrfs_find_name_in_ext_backref(path->nodes[0], path->slots[0],
ref_objectid, name, name_len);
}
static int btrfs_del_inode_extref(struct btrfs_trans_handle *trans,
@@ -139,9 +132,9 @@ static int btrfs_del_inode_extref(struct btrfs_trans_handle *trans,
* This should always succeed so error here will make the FS
* readonly.
*/
if (!btrfs_find_name_in_ext_backref(path->nodes[0], path->slots[0],
ref_objectid,
name, name_len, &extref)) {
extref = btrfs_find_name_in_ext_backref(path->nodes[0], path->slots[0],
ref_objectid, name, name_len);
if (!extref) {
btrfs_handle_fs_error(root->fs_info, -ENOENT, NULL);
ret = -EROFS;
goto out;
@@ -284,7 +277,7 @@ static int btrfs_insert_inode_extref(struct btrfs_trans_handle *trans,
if (btrfs_find_name_in_ext_backref(path->nodes[0],
path->slots[0],
ref_objectid,
name, name_len, NULL))
name, name_len))
goto out;
btrfs_extend_item(path, ins_len);