Btrfs: fix wrong size for the reservation of the, snapshot creation

We should insert/update 6 items(root ref, root backref, dir item, dir index,
root item and parent inode) when creating a snapshot, not 5 items, fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 36e0331..b6b33e4 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4414,10 +4414,10 @@ int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
        struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root);
        struct btrfs_block_rsv *dst_rsv = &pending->block_rsv;
        /*
-        * two for root back/forward refs, two for directory entries
-        * and one for root of the snapshot.
+        * two for root back/forward refs, two for directory entries,
+        * one for root of the snapshot and one for parent inode.
         */
-       u64 num_bytes = btrfs_calc_trans_metadata_size(root, 5);
+       u64 num_bytes = btrfs_calc_trans_metadata_size(root, 6);
        dst_rsv->space_info = src_rsv->space_info;
        return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes);
 }

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index e6934de..c56daa3 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -526,7 +526,7 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
                *inherit = NULL;        /* take responsibility to free it */
        }
 
-       trans = btrfs_start_transaction(root->fs_info->extent_root, 5);
+       trans = btrfs_start_transaction(root->fs_info->extent_root, 6);
        if (IS_ERR(trans)) {
                ret = PTR_ERR(trans);
                goto fail;