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Wong" , Christoph Hellwig , John Garry , Ojaswin Mujoo , Dave Chinner , linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, "Ritesh Harjani (IBM)" Subject: [PATCH v2 4/4] ext4: Do not fallback to buffered-io for DIO atomic write Date: Sun, 27 Oct 2024 23:47:28 +0530 Message-ID: <80da397c359adaf54b87999eff6a63b331cfbcfc.1729944406.git.ritesh.list@gmail.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: References: 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. Reviewed-by: Darrick J. Wong Signed-off-by: Ritesh Harjani (IBM) --- fs/ext4/file.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) -- 2.46.0 diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 8116bd78910b..22d31b4fdff3 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -576,8 +576,18 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from) iomap_ops = &ext4_iomap_overwrite_ops; ret = iomap_dio_rw(iocb, from, iomap_ops, &ext4_dio_write_ops, dio_flags, NULL, 0); - if (ret == -ENOTBLK) + if (ret == -ENOTBLK) { ret = 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 instead of fallback + * to buffered-io. + */ + if (iocb->ki_flags & IOCB_ATOMIC) + ret = -EIO; + } + if (extend) { /* * We always perform extending DIO write synchronously so by