Re: [PATCH 4.14.y] block: Don't invalidate pagecache for invalid falloc modes

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Jan 04, 2024 at 02:27:45PM -0800, Sarthak Kukreti wrote:
> Only call truncate_bdev_range() if the fallocate mode is supported. This
> fixes a bug where data in the pagecache could be invalidated if the
> fallocate() was called on the block device with an invalid mode.
> 
> Fixes: 25f4c41415e5 ("block: implement (some of) fallocate for block devices")
> Cc: stable@vger.kernel.org
> Reported-by: "Darrick J. Wong" <djwong@kernel.org>
> Signed-off-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
> Link: https://lore.kernel.org/r/20231011201230.750105-1-sarthakkukreti@chromium.org
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> (cherry picked from commit 1364a3c391aedfeb32aa025303ead3d7c91cdf9d)
> Signed-off-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
> ---
>  fs/block_dev.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)

All now queued up, thanks for the backports.

greg k-h