Btrfs: remove negative dentry when deleting subvolumne

The use of btrfs_dentry_delete is removing dentries from the
dcache when deleting subvolumne. btrfs_dentry_delete ignores
negative dentries. This is incorrect since if we don't remove
the negative dentry, its parent dentry can't be removed.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index ccc4f11..d3585cb 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3629,12 +3629,14 @@ static int btrfs_dentry_delete(struct dentry *dentry)
 {
        struct btrfs_root *root;
 
-       if (!dentry->d_inode)
-               return 0;
+       if (!dentry->d_inode && !IS_ROOT(dentry))
+               dentry = dentry->d_parent;
 
-       root = BTRFS_I(dentry->d_inode)->root;
-       if (btrfs_root_refs(&root->root_item) == 0)
-               return 1;
+       if (dentry->d_inode) {
+               root = BTRFS_I(dentry->d_inode)->root;
+               if (btrfs_root_refs(&root->root_item) == 0)
+                       return 1;
+       }
        return 0;
 }
 

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9a780c8..e8795be 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -830,6 +830,7 @@ out_up_write:
 out_unlock:
        mutex_unlock(&inode->i_mutex);
        if (!err) {
+               shrink_dcache_sb(root->fs_info->sb);
                btrfs_invalidate_inodes(dest);
                d_delete(dentry);
        }