diff options
| author | Guo Chao <yan@linux.vnet.ibm.com> | 2013-02-21 15:16:42 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-20 13:05:00 -0700 |
| commit | d72b4f90a2b042136f74a3de50b29d6ce76b5f12 (patch) | |
| tree | 61006b7819cf5bf3eebe63702f0aa6a8eb095c15 | |
| parent | 969ff7dc5423e50938e7b42b59fe1163aced714c (diff) | |
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 <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>
Acked-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/block_dev.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index b3be92c980ee..a6e1e06e4bb8 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1086,7 +1086,9 @@ 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; |