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Commit d646a02a authored by Guo Chao's avatar Guo Chao Committed by Jens Axboe
Browse files

block: use i_size_write() in bd_set_size() 



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: default avatarGuo Chao <yan@linux.vnet.ibm.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Guo Chao <yan@linux.vnet.ibm.com>
Cc: M. Hindess <hindessm@uk.ibm.com>
Cc: Nikanth Karthikesan <knikanth@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent a3cc86c2

fs/block_dev.c

+3 −1
Original line number Diff line number Diff line
@@ -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;