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authorLi Zefan <lizf@cn.fujitsu.com>2010-12-07 01:51:26 +0000
committerChris Mason <chris.mason@oracle.com>2010-12-10 16:29:10 -0500
commitf106e82caaa0d943e47cacc184f5b40d538e0044 (patch)
tree5e8b6c5e0b0b35c65ed509029cda85bd54a8aab8 /fs
parent75eaa0e22c055e38982df267d0f84cc510ba38bf (diff)
downloadop-kernel-dev-f106e82caaa0d943e47cacc184f5b40d538e0044.zip
op-kernel-dev-f106e82caaa0d943e47cacc184f5b40d538e0044.tar.gz
Btrfs: Fix a crash when mounting a subvolume
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/super.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 47bf67c..61bd79a 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -685,9 +685,9 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
mutex_unlock(&root->d_inode->i_mutex);
if (IS_ERR(new_root)) {
+ dput(root);
deactivate_locked_super(s);
error = PTR_ERR(new_root);
- dput(root);
goto error_free_subvol_name;
}
if (!new_root->d_inode) {
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