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-rw-r--r--fs/btrfs/dir-item.c122
1 files changed, 75 insertions, 47 deletions
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 863367c2c..98c6faa8c 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -171,10 +171,40 @@ out_free:
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
- * item (use mod < 0) or changing the options (use mod > 0)
+ * Lookup for a directory item by name.
+ *
+ * @trans: The transaction handle to use. Can be NULL if @mod is 0.
+ * @root: The root of the target tree.
+ * @path: Path to use for the search.
+ * @dir: The inode number (objectid) of the directory.
+ * @name: The name associated to the directory entry we are looking for.
+ * @name_len: The length of the name.
+ * @mod: Used to indicate if the tree search is meant for a read only
+ * lookup, for a modification lookup or for a deletion lookup, so
+ * its value should be 0, 1 or -1, respectively.
+ *
+ * Returns: NULL if the dir item does not exists, an error pointer if an error
+ * happened, or a pointer to a dir item if a dir item exists for the given name.
*/
struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
@@ -182,23 +212,18 @@ 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 +237,6 @@ 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 +245,20 @@ 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;
@@ -261,35 +285,42 @@ out:
}
/*
- * lookup a directory item based on index. 'dir' is the objectid
- * we're searching in, and 'mod' tells us if you plan on deleting the
- * item (use mod < 0) or changing the options (use mod > 0)
+ * Lookup for a directory index item by name and index number.
+ *
+ * @trans: The transaction handle to use. Can be NULL if @mod is 0.
+ * @root: The root of the target tree.
+ * @path: Path to use for the search.
+ * @dir: The inode number (objectid) of the directory.
+ * @index: The index number.
+ * @name: The name associated to the directory entry we are looking for.
+ * @name_len: The length of the name.
+ * @mod: Used to indicate if the tree search is meant for a read only
+ * lookup, for a modification lookup or for a deletion lookup, so
+ * its value should be 0, 1 or -1, respectively.
*
- * The name is used to make sure the index really points to the name you were
- * looking for.
+ * Returns: NULL if the dir index item does not exists, an error pointer if an
+ * error happened, or a pointer to a dir item if the dir index item exists and
+ * matches the criteria (name and index number).
*/
struct btrfs_dir_item *
btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, u64 dir,
- u64 objectid, const char *name, int name_len,
+ u64 index, const char *name, int name_len,
int mod)
{
- int ret;
+ struct btrfs_dir_item *di;
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;
+ key.offset = index;
- 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);
+ di = btrfs_lookup_match_dir(trans, root, path, &key, name, name_len, mod);
+ if (di == ERR_PTR(-ENOENT))
+ return NULL;
+
+ return di;
}
struct btrfs_dir_item *
@@ -346,21 +377,18 @@ 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;
}
/*
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 02:58:21 +0000