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authorGuo Chao <yan@linux.vnet.ibm.com>2013-02-21 15:16:42 -0800
committerJens Axboe <axboe@kernel.dk>2013-02-22 10:42:46 +0100
commitd646a02a9d44d1421f273ae3923d97b47b918176 (patch)
tree371fd1c8f675ff8532337b913a24237501c7d394 /fs/block_dev.c
parenta3cc86c2f00839453d2dbeb46bfc44e885b073db (diff)
downloadop-kernel-dev-d646a02a9d44d1421f273ae3923d97b47b918176.zip
op-kernel-dev-d646a02a9d44d1421f273ae3923d97b47b918176.tar.gz
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: Guo 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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/block_dev.c')
-rw-r--r--fs/block_dev.c4
1 files changed, 3 insertions, 1 deletions
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;
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