Btrfs - fix race between btrfs_get_sb() and umount

When mounting a btrfs file system btrfs_test_super() may attempt to
use sb->s_fs_info, the btrfs root, of a super block that is going away
and that has had the btrfs root set to NULL in its ->put_super(). But
if the super block is going away it cannot be an existing super block
so we can return false in this case.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 66e4612a791..141fb317d3b 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -566,6 +566,12 @@ static int btrfs_test_super(struct super_block *s, void *data)
         struct btrfs_fs_devices *test_fs_devices = data;
         struct btrfs_root *root = btrfs_sb(s);
 
+        /*
+         * If this super block is going away, return false as it
+         * can't match as an existing super block.
+         */
+        if (!atomic_read(&s->s_active))
+                return 0;
         return root->fs_info->fs_devices == test_fs_devices;
 }