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block: initialise bd_super in bdget()

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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>
This commit is contained in:
Lachlan McIlroy 2011-06-30 11:01:45 +10:00 committed by Al Viro
parent c4ae0c6545
commit 782b94cdf5
1 changed files with 1 additions and 0 deletions
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fs/block_dev.c
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@ -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;