From f884319c7db711bc4778a8aa4693cc444e570486 Mon Sep 17 00:00:00 2001 From: Guo Chao Date: Thu, 21 Feb 2013 15:16:42 -0800 Subject: [PATCH] block: use i_size_write() in bd_set_size() 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 Cc: Alexander Viro Cc: Guo Chao Cc: M. Hindess Cc: Nikanth Karthikesan Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Jens Axboe Acked-by: Jeff Mahoney Signed-off-by: Greg Kroah-Hartman --- 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 78333a37f49d..78edf767b5cc 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1033,7 +1033,9 @@ 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; -- 2.39.5