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Wong" , Christoph Hellwig , John Garry , Ojaswin Mujoo , Dave Chinner , Carlos Maiolino , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, "Ritesh Harjani (IBM)" Subject: [PATCH] xfs: Do not fallback to buffered-io for DIO atomic write Date: Fri, 25 Oct 2024 23:48:05 +0530 Message-ID: <627c14b7987a3ab91d9bff31b99d86167d56f476.1729879630.git.ritesh.list@gmail.com> X-Mailer: git-send-email 2.46.0 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 iomap can return -ENOTBLK if pagecache invalidation fails. Let's make sure if -ENOTBLK is ever returned for atomic writes than we fail the write request (-EIO) instead of fallback to buffered-io. Suggested-by: Darrick J. Wong Signed-off-by: Ritesh Harjani (IBM) Reviewed-by: Darrick J. Wong --- This should be on top of John's atomic write series [1]. [1]: https://lore.kernel.org/linux-xfs/20241019125113.369994-1-john.g.garry@oracle.com/ fs/xfs/xfs_file.c | 8 ++++++++ 1 file changed, 8 insertions(+) -- 2.39.5 diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index ca47cae5a40a..b819a9273511 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -876,6 +876,14 @@ xfs_file_write_iter( ret = xfs_file_dio_write(iocb, from); if (ret != -ENOTBLK) return ret; + /* + * iomap can return -ENOTBLK if pagecache invalidation fails. + * Let's make sure if -ENOTBLK is ever returned for atomic + * writes than we fail the write request instead of fallback + * to buffered-io. + */ + if (iocb->ki_flags & IOCB_ATOMIC) + return -EIO; } return xfs_file_buffered_write(iocb, from);