On Fri, Mar 15, 2013 at 06:24:38PM -0400, Jeff Mahoney wrote:
> Commit d646a02a9d44d1421f273ae3923d97b47b918176 upstream.
Thanks, queuing for 3.5 kernel.
Cheers,
--
Luis
>
> 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>
> Cc: stable@xxxxxxxxxxxxxxx # 3.0 3.2 3.4 3.8
> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
> Acked-by: Jeff Mahoney <jeffm@xxxxxxxx>
> ---
> fs/block_dev.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/fs/block_dev.c b/fs/block_dev.c
> index 172f849..82b7c9a 100644
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -1032,7 +1032,9 @@ void bd_set_size(struct block_device *bdev, loff_t size)
> {
> 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;
>
>
> --
> Jeff Mahoney
> SUSE Labs
> --
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