block: initialise bd_super in bdget()

bd_super is currently reset to NULL in kill_block_super() so we rely on previous
users of the block_device object to initialise this value for the next user.
This quirk was exposed on RHEL5 when a third party filesystem did not always use
kill_block_super() and therefore bd_super wasn't being reset when a block_device
object was recycled within the cache.  This may not be a problem upstream but
makes sense to be defensive.

Signed-off-by: Lachlan McIlroy <lmcilroy@redhat.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index f55aad4d1611..f28680553288 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -552,6 +552,7 @@ struct block_device *bdget(dev_t dev)
 
         if (inode->i_state & I_NEW) {
                 bdev->bd_contains = NULL;
+                bdev->bd_super = NULL;
                 bdev->bd_inode = inode;
                 bdev->bd_block_size = (1 << inode->i_blkbits);
                 bdev->bd_part_count = 0;