The function btrfs_link_subvol is responsible to link the subvolume to
the specified directory, which is the opposite of what
btrfs_unlink_subvol does.
No functional change.
Signed-off-by: Lu Fengqi <lufq.f...@cn.fujitsu.com>
---
fs/btrfs/ioctl.c | 65 ++++++++++++++++++++++++++++++------------------
1 file changed, 41 insertions(+), 24 deletions(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index d3a5d2a41e5f..d37c26f69112 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -542,6 +542,45 @@ int btrfs_is_empty_uuid(u8 *uuid)
return 1;
}
+static int btrfs_link_subvol(struct btrfs_trans_handle *trans,
+ struct inode *dir, u64 objectid, const char *name,
+ int namelen)
+{
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct btrfs_key key;
+ u64 index = 0;
+ int ret;
+
+ /*
+ * insert the directory item
+ */
+ ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
+ if (ret) {
+ btrfs_abort_transaction(trans, ret);
+ return ret;
+ }
+
+ key.objectid = objectid;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = -1;
+ ret = btrfs_insert_dir_item(trans, root, name, namelen, BTRFS_I(dir),
+ &key, BTRFS_FT_DIR, index);
+ if (ret) {
+ btrfs_abort_transaction(trans, ret);
+ return ret;
+ }
+
+ btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
+ ret = btrfs_update_inode(trans, root, dir);
+ BUG_ON(ret);
+
+ ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
+ btrfs_ino(BTRFS_I(dir)), index, name, namelen);
+ BUG_ON(ret);
+
+ return ret;
+}
+
static noinline int create_subvol(struct inode *dir,
struct dentry *dentry,
const char *name, int namelen,
@@ -563,7 +602,6 @@ static noinline int create_subvol(struct inode *dir,
int err;
u64 objectid;
u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
- u64 index = 0;
uuid_le new_uuid;
root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
@@ -677,30 +715,9 @@ static noinline int create_subvol(struct inode *dir,
new_root->highest_objectid = new_dirid;
mutex_unlock(&new_root->objectid_mutex);
- /*
- * insert the directory item
- */
- ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
- if (ret) {
- btrfs_abort_transaction(trans, ret);
- goto fail;
- }
-
- ret = btrfs_insert_dir_item(trans, root,
- name, namelen, BTRFS_I(dir), &key,
- BTRFS_FT_DIR, index);
- if (ret) {
- btrfs_abort_transaction(trans, ret);
+ ret = btrfs_link_subvol(trans, dir, objectid, name, namelen);
+ if (ret)
goto fail;
- }
-
- btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
- ret = btrfs_update_inode(trans, root, dir);
- BUG_ON(ret);
-
- ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
- btrfs_ino(BTRFS_I(dir)), index, name, namelen);
- BUG_ON(ret);
ret = btrfs_uuid_tree_add(trans, root_item->uuid,
BTRFS_UUID_KEY_SUBVOL, objectid);
--
2.18.0
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