why?
On Thu, Apr 06, 2017 at 04:02:49PM +0400, Dmitry Monakhov wrote:
> Signed-off-by: Dmitry Monakhov <dmonak...@openvz.org>
> ---
> fs/block_dev.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/fs/block_dev.c b/fs/block_dev.c
> index 2eca00e..f4b13e1 100644
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -2075,7 +2075,7 @@ static long blkdev_fallocate(struct file *file, int
> mode, loff_t start,
> {
> struct block_device *bdev = I_BDEV(bdev_file_inode(file));
> struct request_queue *q = bdev_get_queue(bdev);
> - struct address_space *mapping;
> + struct address_space *mapping = bdev->bd_inode->i_mapping;
> loff_t end = start + len - 1;
> loff_t isize;
> int error;
> @@ -2102,13 +2102,10 @@ static long blkdev_fallocate(struct file *file, int
> mode, loff_t start,
> if ((start | len) & (bdev_logical_block_size(bdev) - 1))
> return -EINVAL;
>
> - /* Invalidate the page cache, including dirty pages. */
> - mapping = bdev->bd_inode->i_mapping;
> - truncate_inode_pages_range(mapping, start, end);
> -
> switch (mode) {
> case FALLOC_FL_ZERO_RANGE:
> case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE:
> + truncate_inode_pages_range(mapping, start, end);
> error = blkdev_issue_zeroout(bdev, start >> 9, len >> 9,
> GFP_KERNEL, false);
> break;
> @@ -2116,12 +2113,14 @@ static long blkdev_fallocate(struct file *file, int
> mode, loff_t start,
> /* Only punch if the device can do zeroing discard. */
> if (!blk_queue_discard(q) || !q->limits.discard_zeroes_data)
> return -EOPNOTSUPP;
> + truncate_inode_pages_range(mapping, start, end);
> error = blkdev_issue_discard(bdev, start >> 9, len >> 9,
> GFP_KERNEL, 0);
> break;
> case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE |
> FALLOC_FL_NO_HIDE_STALE:
> if (!blk_queue_discard(q))
> return -EOPNOTSUPP;
> + truncate_inode_pages_range(mapping, start, end);
> error = blkdev_issue_discard(bdev, start >> 9, len >> 9,
> GFP_KERNEL, 0);
> break;
> --
> 2.9.3
>
---end quoted text---
