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Message-ID: <20241101111513.mjbkvsl5tk3vyz2d@quack3>
Date: Fri, 1 Nov 2024 12:15:13 +0100
From: Jan Kara <jack@...e.cz>
To: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Cc: linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
Jan Kara <jack@...e.cz>, "Darrick J . Wong" <djwong@...nel.org>,
Christoph Hellwig <hch@...radead.org>,
John Garry <john.g.garry@...cle.com>,
Ojaswin Mujoo <ojaswin@...ux.ibm.com>,
Dave Chinner <david@...morbit.com>, linux-kernel@...r.kernel.org,
linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v4 2/4] ext4: Check for atomic writes support in write
iter
On Fri 01-11-24 12:20:52, Ritesh Harjani (IBM) wrote:
> Let's validate the given constraints for atomic write request.
> Otherwise it will fail with -EINVAL. Currently atomic write is only
> supported on DIO, so for buffered-io it will return -EOPNOTSUPP.
>
> Reviewed-by: John Garry <john.g.garry@...cle.com>
> Reviewed-by: Darrick J. Wong <djwong@...nel.org>
> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
Looks good. Feel free to add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> fs/ext4/file.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
> index f14aed14b9cf..a7b9b9751a3f 100644
> --- a/fs/ext4/file.c
> +++ b/fs/ext4/file.c
> @@ -692,6 +692,20 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
> if (IS_DAX(inode))
> return ext4_dax_write_iter(iocb, from);
> #endif
> +
> + if (iocb->ki_flags & IOCB_ATOMIC) {
> + size_t len = iov_iter_count(from);
> + int ret;
> +
> + if (len < EXT4_SB(inode->i_sb)->s_awu_min ||
> + len > EXT4_SB(inode->i_sb)->s_awu_max)
> + return -EINVAL;
> +
> + ret = generic_atomic_write_valid(iocb, from);
> + if (ret)
> + return ret;
> + }
> +
> if (iocb->ki_flags & IOCB_DIRECT)
> return ext4_dio_write_iter(iocb, from);
> else
> --
> 2.46.0
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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