linux-kernel - [PATCH 1/1] block: initialise bd

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Message-Id: <1309395705-4473-1-git-send-email-lmcilroy@redhat.com>
Date:	Thu, 30 Jun 2011 11:01:45 +1000
From:	Lachlan McIlroy <lmcilroy@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Lachlan McIlroy <lmcilroy@...hat.com>
Subject: [PATCH 1/1] 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@...hat.com>
---
 fs/block_dev.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 610e8e0..2b0dc33 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -547,6 +547,7 @@ 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;
-- 
1.7.2.3

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