From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guo Chao Subject: [PATCH 1/7] block: use i_size_write() in bd_set_size() Date: Fri, 25 Jan 2013 18:56:16 +0800 Message-ID: <1359111382-12654-2-git-send-email-yan@linux.vnet.ibm.com> References: <1359111382-12654-1-git-send-email-yan@linux.vnet.ibm.com> Cc: linux-kernel@vger.kernel.org, Alexander Viro , linux-fsdevel@vger.kernel.org To: axboe@kernel.dk Return-path: In-Reply-To: <1359111382-12654-1-git-send-email-yan@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org 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. Cc: Alexander Viro Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Guo Chao --- 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; -- 1.7.9.5