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Btrfs: Fix a crash when mounting a subvolume

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We should drop dentry before deactivating the superblock, otherwise
we can hit this bug:

BUG: Dentry f349a690{i=100,n=/} still in use (1) [unmount of btrfs loop1]
...

Steps to reproduce the bug:

  # mount /dev/loop1 /mnt
  # mkdir save
  # btrfs subvolume snapshot /mnt save/snap1
  # umount /mnt
  # mount -o subvol=save/snap1 /dev/loop1 /mnt
  (crash)

Reported-by: Michael Niederle <mniederle@gmx.at>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Li Zefan 2010-12-07 01:51:26 +00:00 committed by Chris Mason
parent 75eaa0e22c
commit f106e82caa
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/super.c
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@ -685,9 +685,9 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
mutex_unlock(&root->d_inode->i_mutex); mutex_unlock(&root->d_inode->i_mutex);
if (IS_ERR(new_root)) { if (IS_ERR(new_root)) {
dput(root);
deactivate_locked_super(s); deactivate_locked_super(s);
error = PTR_ERR(new_root); error = PTR_ERR(new_root);
dput(root);
goto error_free_subvol_name; goto error_free_subvol_name;
} }
if (!new_root->d_inode) { if (!new_root->d_inode) {