Btrfs: new subvolume oops fix

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index eba239c..6940a90 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2013,6 +2013,8 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
        BUG_ON(!trans);
 
        subvol = btrfs_alloc_free_block(trans, root);
+       if (subvol == NULL)
+               return -ENOSPC;
        leaf = btrfs_buffer_leaf(subvol);
        btrfs_set_header_nritems(&leaf->header, 0);
        btrfs_set_header_level(&leaf->header, 0);
@@ -2022,8 +2024,6 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
        memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
               sizeof(leaf->header.fsid));
        mark_buffer_dirty(subvol);
-       brelse(subvol);
-       subvol = NULL;
 
        inode_item = &root_item.inode;
        memset(inode_item, 0, sizeof(*inode_item));
@@ -2035,6 +2035,8 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
 
        btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
        btrfs_set_root_refs(&root_item, 1);
+       brelse(subvol);
+       subvol = NULL;
 
        ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
                                       0, &objectid);