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 <[email protected]> Reviewed-by: Eric Sandeen <[email protected]> Signed-off-by: Al Viro <[email protected]>
franciscofranco · Aug 1, 2011 · 782b94c · 782b94c
1 parent c4ae0c6
commit 782b94c
Showing 1 changed file with 1 addition and 0 deletions.
diff --git 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;