5.10-stable review patch. If anyone has any objections, please let me know.
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From: Marcos Paulo de Souza mpdesouza@suse.com
[ Upstream commit a7d1c5dc8632e9b370ad26478c468d4e4e29f263 ]
btrfs_search_slot is called in multiple places in dir-item.c to search for a dir entry, and then calling btrfs_match_dir_name to return a btrfs_dir_item.
In order to reduce the number of callers of btrfs_search_slot, create a common function that looks for the dir key, and if found call btrfs_match_dir_item_name.
Signed-off-by: Marcos Paulo de Souza mpdesouza@suse.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Stable-dep-of: 8dcbc26194eb ("btrfs: unify lookup return value when dir entry is missing") Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/dir-item.c | 76 +++++++++++++++++++++++---------------------- 1 file changed, 39 insertions(+), 37 deletions(-)
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index 863367c2c6205..1c0a7cd6b9b0a 100644 --- a/fs/btrfs/dir-item.c +++ b/fs/btrfs/dir-item.c @@ -171,6 +171,25 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name, return 0; }
+static struct btrfs_dir_item *btrfs_lookup_match_dir( + struct btrfs_trans_handle *trans, + struct btrfs_root *root, struct btrfs_path *path, + struct btrfs_key *key, const char *name, + int name_len, int mod) +{ + const int ins_len = (mod < 0 ? -1 : 0); + const int cow = (mod != 0); + int ret; + + ret = btrfs_search_slot(trans, root, key, path, ins_len, cow); + if (ret < 0) + return ERR_PTR(ret); + if (ret > 0) + return ERR_PTR(-ENOENT); + + return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); +} + /* * lookup a directory item based on name. 'dir' is the objectid * we're searching in, and 'mod' tells us if you plan on deleting the @@ -182,23 +201,18 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, const char *name, int name_len, int mod) { - int ret; struct btrfs_key key; - int ins_len = mod < 0 ? -1 : 0; - int cow = mod != 0; + struct btrfs_dir_item *di;
key.objectid = dir; key.type = BTRFS_DIR_ITEM_KEY; - key.offset = btrfs_name_hash(name, name_len);
- ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); - if (ret < 0) - return ERR_PTR(ret); - if (ret > 0) + di = btrfs_lookup_match_dir(trans, root, path, &key, name, name_len, mod); + if (IS_ERR(di) && PTR_ERR(di) == -ENOENT) return NULL;
- return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); + return di; }
int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, @@ -212,7 +226,6 @@ int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, int slot; struct btrfs_path *path;
- path = btrfs_alloc_path(); if (!path) return -ENOMEM; @@ -221,20 +234,20 @@ int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, key.type = BTRFS_DIR_ITEM_KEY; key.offset = btrfs_name_hash(name, name_len);
- ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); - - /* return back any errors */ - if (ret < 0) - goto out; + di = btrfs_lookup_match_dir(NULL, root, path, &key, name, name_len, 0); + if (IS_ERR(di)) { + ret = PTR_ERR(di); + /* Nothing found, we're safe */ + if (ret == -ENOENT) { + ret = 0; + goto out; + }
- /* nothing found, we're safe */ - if (ret > 0) { - ret = 0; - goto out; + if (ret < 0) + goto out; }
/* we found an item, look for our name in the item */ - di = btrfs_match_dir_item_name(root->fs_info, path, name, name_len); if (di) { /* our exact name was found */ ret = -EEXIST; @@ -275,21 +288,13 @@ btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, u64 objectid, const char *name, int name_len, int mod) { - int ret; struct btrfs_key key; - int ins_len = mod < 0 ? -1 : 0; - int cow = mod != 0;
key.objectid = dir; key.type = BTRFS_DIR_INDEX_KEY; key.offset = objectid;
- ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); - if (ret < 0) - return ERR_PTR(ret); - if (ret > 0) - return ERR_PTR(-ENOENT); - return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); + return btrfs_lookup_match_dir(trans, root, path, &key, name, name_len, mod); }
struct btrfs_dir_item * @@ -346,21 +351,18 @@ struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, const char *name, u16 name_len, int mod) { - int ret; struct btrfs_key key; - int ins_len = mod < 0 ? -1 : 0; - int cow = mod != 0; + struct btrfs_dir_item *di;
key.objectid = dir; key.type = BTRFS_XATTR_ITEM_KEY; key.offset = btrfs_name_hash(name, name_len); - ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); - if (ret < 0) - return ERR_PTR(ret); - if (ret > 0) + + di = btrfs_lookup_match_dir(trans, root, path, &key, name, name_len, mod); + if (IS_ERR(di) && PTR_ERR(di) == -ENOENT) return NULL;
- return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); + return di; }
/*