This is a note to let you know that I've just added the patch titled
block: use i_size_write() in bd_set_size()
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
block-use-i_size_write-in-bd_set_size.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d646a02a9d44d1421f273ae3923d97b47b918176 Mon Sep 17 00:00:00 2001
From: Guo Chao <yan@xxxxxxxxxxxxxxxxxx>
Date: Thu, 21 Feb 2013 15:16:42 -0800
Subject: block: use i_size_write() in bd_set_size()
From: Guo Chao <yan@xxxxxxxxxxxxxxxxxx>
commit d646a02a9d44d1421f273ae3923d97b47b918176 upstream.
blkdev_ioctl(GETBLKSIZE) uses i_size_read() to read size of block device.
If we update block size directly, reader may see intermediate result in
some machines and configurations. Use i_size_write() instead.
Signed-off-by: Guo Chao <yan@xxxxxxxxxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Guo Chao <yan@xxxxxxxxxxxxxxxxxx>
Cc: M. Hindess <hindessm@xxxxxxxxxx>
Cc: Nikanth Karthikesan <knikanth@xxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Acked-by: Jeff Mahoney <jeffm@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/block_dev.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1086,7 +1086,9 @@ void bd_set_size(struct block_device *bd
{
unsigned bsize = bdev_logical_block_size(bdev);
- bdev->bd_inode->i_size = size;
+ mutex_lock(&bdev->bd_inode->i_mutex);
+ i_size_write(bdev->bd_inode, size);
+ mutex_unlock(&bdev->bd_inode->i_mutex);
while (bsize < PAGE_CACHE_SIZE) {
if (size & bsize)
break;
Patches currently in stable-queue which might be from yan@xxxxxxxxxxxxxxxxxx are
queue-3.4/loopdev-fix-a-deadlock.patch
queue-3.4/block-use-i_size_write-in-bd_set_size.patch
queue-3.4/loopdev-remove-an-user-triggerable-oops.patch
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