linux-kernel - Re: [PATCH v5 1/7] block/fs: Pass an iocb to generic_atomic_write

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Message-ID: <20240820172839.GG6082@frogsfrogsfrogs>
Date: Tue, 20 Aug 2024 10:28:39 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: John Garry <john.g.garry@...cle.com>
Cc: axboe@...nel.dk, brauner@...nel.org, viro@...iv.linux.org.uk,
	jack@...e.cz, chandan.babu@...cle.com, dchinner@...hat.com,
	hch@....de, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, hare@...e.de,
	martin.petersen@...cle.com, catherine.hoang@...cle.com,
	kbusch@...nel.org
Subject: Re: [PATCH v5 1/7] block/fs: Pass an iocb to
 generic_atomic_write_valid()

On Sat, Aug 17, 2024 at 09:47:54AM +0000, John Garry wrote:
> Darrick and Hannes thought it better that generic_atomic_write_valid()
> should be passed a struct iocb, and not just the member of that struct
> which is referenced; see [0] and [1].
> 
> I think that makes a more generic and clean API, so make that change.
> 
> [0] https://lore.kernel.org/linux-block/680ce641-729b-4150-b875-531a98657682@suse.de/
> [1] https://lore.kernel.org/linux-xfs/20240620212401.GA3058325@frogsfrogsfrogs/
> 
> Suggested-by: Darrick J. Wong <djwong@...nel.org>
> Suggested-by: Hannes Reinecke <hare@...e.de>
> Signed-off-by: John Garry <john.g.garry@...cle.com>

Thanks for doing this,
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  block/fops.c       | 8 ++++----
>  fs/read_write.c    | 4 ++--
>  include/linux/fs.h | 2 +-
>  3 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/block/fops.c b/block/fops.c
> index 9825c1713a49..1c0f9d313845 100644
> --- a/block/fops.c
> +++ b/block/fops.c
> @@ -34,13 +34,13 @@ static blk_opf_t dio_bio_write_op(struct kiocb *iocb)
>  	return opf;
>  }
>  
> -static bool blkdev_dio_invalid(struct block_device *bdev, loff_t pos,
> +static bool blkdev_dio_invalid(struct block_device *bdev, struct kiocb *iocb,
>  				struct iov_iter *iter, bool is_atomic)
>  {
> -	if (is_atomic && !generic_atomic_write_valid(iter, pos))
> +	if (is_atomic && !generic_atomic_write_valid(iocb, iter))
>  		return true;
>  
> -	return pos & (bdev_logical_block_size(bdev) - 1) ||
> +	return iocb->ki_pos & (bdev_logical_block_size(bdev) - 1) ||
>  		!bdev_iter_is_aligned(bdev, iter);
>  }
>  
> @@ -373,7 +373,7 @@ static ssize_t blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
>  	if (!iov_iter_count(iter))
>  		return 0;
>  
> -	if (blkdev_dio_invalid(bdev, iocb->ki_pos, iter, is_atomic))
> +	if (blkdev_dio_invalid(bdev, iocb, iter, is_atomic))
>  		return -EINVAL;
>  
>  	nr_pages = bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS + 1);
> diff --git a/fs/read_write.c b/fs/read_write.c
> index 90e283b31ca1..d8af6f2f1c9a 100644
> --- a/fs/read_write.c
> +++ b/fs/read_write.c
> @@ -1737,7 +1737,7 @@ int generic_file_rw_checks(struct file *file_in, struct file *file_out)
>  	return 0;
>  }
>  
> -bool generic_atomic_write_valid(struct iov_iter *iter, loff_t pos)
> +bool generic_atomic_write_valid(struct kiocb *iocb, struct iov_iter *iter)
>  {
>  	size_t len = iov_iter_count(iter);
>  
> @@ -1747,7 +1747,7 @@ bool generic_atomic_write_valid(struct iov_iter *iter, loff_t pos)
>  	if (!is_power_of_2(len))
>  		return false;
>  
> -	if (!IS_ALIGNED(pos, len))
> +	if (!IS_ALIGNED(iocb->ki_pos, len))
>  		return false;
>  
>  	return true;
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index fd34b5755c0b..55d8b6beac7a 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -3657,6 +3657,6 @@ static inline bool vfs_empty_path(int dfd, const char __user *path)
>  	return !c;
>  }
>  
> -bool generic_atomic_write_valid(struct iov_iter *iter, loff_t pos);
> +bool generic_atomic_write_valid(struct kiocb *iocb, struct iov_iter *iter);
>  
>  #endif /* _LINUX_FS_H */
> -- 
> 2.31.1
>