Re: [PATCH 1/3] xfs: factor out a xfs_ilock_iocb helper

[Brian Foster <bfoster@redhat.com>]

On Mon, Jan 11, 2021 at 05:12:10PM +0100, Christoph Hellwig wrote:
> Add a helper to factor out the nowait locking logical for the read/write
> helpers.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---

Reviewed-by: Brian Foster <bfoster@redhat.com>

>  fs/xfs/xfs_file.c | 55 +++++++++++++++++++++++++----------------------
>  1 file changed, 29 insertions(+), 26 deletions(-)
> 
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index ba02780dee6439..aa3fe89628f0f1 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -217,6 +217,23 @@ xfs_file_fsync(
>  	return error;
>  }
>  
> +static int
> +xfs_ilock_iocb(
> +	struct kiocb		*iocb,
> +	unsigned int		lock_mode)
> +{
> +	struct xfs_inode	*ip = XFS_I(file_inode(iocb->ki_filp));
> +
> +	if (iocb->ki_flags & IOCB_NOWAIT) {
> +		if (!xfs_ilock_nowait(ip, lock_mode))
> +			return -EAGAIN;
> +	} else {
> +		xfs_ilock(ip, lock_mode);
> +	}
> +
> +	return 0;
> +}
> +
>  STATIC ssize_t
>  xfs_file_dio_aio_read(
>  	struct kiocb		*iocb,
> @@ -233,12 +250,9 @@ xfs_file_dio_aio_read(
>  
>  	file_accessed(iocb->ki_filp);
>  
> -	if (iocb->ki_flags & IOCB_NOWAIT) {
> -		if (!xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED))
> -			return -EAGAIN;
> -	} else {
> -		xfs_ilock(ip, XFS_IOLOCK_SHARED);
> -	}
> +	ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
> +	if (ret)
> +		return ret;
>  	ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL,
>  			is_sync_kiocb(iocb));
>  	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
> @@ -260,13 +274,9 @@ xfs_file_dax_read(
>  	if (!count)
>  		return 0; /* skip atime */
>  
> -	if (iocb->ki_flags & IOCB_NOWAIT) {
> -		if (!xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED))
> -			return -EAGAIN;
> -	} else {
> -		xfs_ilock(ip, XFS_IOLOCK_SHARED);
> -	}
> -
> +	ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
> +	if (ret)
> +		return ret;
>  	ret = dax_iomap_rw(iocb, to, &xfs_read_iomap_ops);
>  	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
>  
> @@ -284,12 +294,9 @@ xfs_file_buffered_aio_read(
>  
>  	trace_xfs_file_buffered_read(ip, iov_iter_count(to), iocb->ki_pos);
>  
> -	if (iocb->ki_flags & IOCB_NOWAIT) {
> -		if (!xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED))
> -			return -EAGAIN;
> -	} else {
> -		xfs_ilock(ip, XFS_IOLOCK_SHARED);
> -	}
> +	ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
> +	if (ret)
> +		return ret;
>  	ret = generic_file_read_iter(iocb, to);
>  	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
>  
> @@ -628,13 +635,9 @@ xfs_file_dax_write(
>  	size_t			count;
>  	loff_t			pos;
>  
> -	if (iocb->ki_flags & IOCB_NOWAIT) {
> -		if (!xfs_ilock_nowait(ip, iolock))
> -			return -EAGAIN;
> -	} else {
> -		xfs_ilock(ip, iolock);
> -	}
> -
> +	ret = xfs_ilock_iocb(iocb, iolock);
> +	if (ret)
> +		return ret;
>  	ret = xfs_file_aio_write_checks(iocb, from, &iolock);
>  	if (ret)
>  		goto out;
> -- 
> 2.29.2
>