Re: [PATCH v4 08/17] xfs: mount-api - move xfs_parseargs() validation to a helper

[Brian Foster <bfoster@redhat.com>]

On Thu, Oct 03, 2019 at 06:26:01PM +0800, Ian Kent wrote:
> Move the validation code of xfs_parseargs() into a helper for later
> use within the mount context methods.
> 
> Signed-off-by: Ian Kent <raven@themaw.net>
> ---
>  fs/xfs/xfs_super.c |  147 +++++++++++++++++++++++++++++++++-------------------
>  1 file changed, 94 insertions(+), 53 deletions(-)
> 
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index 7fd3975d5523..7008355df065 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
...
> @@ -441,15 +533,6 @@ xfs_parseargs(
>  			return ret;
>  	}
>  
> -	/*
> -	 * no recovery flag requires a read-only mount
> -	 */
> -	if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
> -	    !(mp->m_flags & XFS_MOUNT_RDONLY)) {
> -		xfs_warn(mp, "no-recovery mounts must be read-only.");
> -		return -EINVAL;
> -	}
> -

Is there a reason that various checks above this one are replicated in
the helper and not removed from xfs_parseargs()? Either way, it looks
like this code goes away anyways:

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

>  	if ((mp->m_flags & XFS_MOUNT_NOALIGN) &&
>  	    (ctx->dsunit || ctx->dswidth)) {
>  		xfs_warn(mp,
> @@ -477,51 +560,9 @@ xfs_parseargs(
>  	}
>  
>  done:
> -	if (ctx->dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
> -		/*
> -		 * At this point the superblock has not been read
> -		 * in, therefore we do not know the block size.
> -		 * Before the mount call ends we will convert
> -		 * these to FSBs.
> -		 */
> -		mp->m_dalign = ctx->dsunit;
> -		mp->m_swidth = ctx->dswidth;
> -	}
> +	ret = xfs_validate_params(mp, &context, false);
>  
> -	if (mp->m_logbufs != -1 &&
> -	    mp->m_logbufs != 0 &&
> -	    (mp->m_logbufs < XLOG_MIN_ICLOGS ||
> -	     mp->m_logbufs > XLOG_MAX_ICLOGS)) {
> -		xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
> -			mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
> -		return -EINVAL;
> -	}
> -	if (mp->m_logbsize != -1 &&
> -	    mp->m_logbsize !=  0 &&
> -	    (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
> -	     mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
> -	     !is_power_of_2(mp->m_logbsize))) {
> -		xfs_warn(mp,
> -			"invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
> -			mp->m_logbsize);
> -		return -EINVAL;
> -	}
> -
> -	if (ctx->iosizelog) {
> -		if (ctx->iosizelog > XFS_MAX_IO_LOG ||
> -		    ctx->iosizelog < XFS_MIN_IO_LOG) {
> -			xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
> -				ctx->iosizelog, XFS_MIN_IO_LOG,
> -				XFS_MAX_IO_LOG);
> -			return -EINVAL;
> -		}
> -
> -		mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
> -		mp->m_readio_log = ctx->iosizelog;
> -		mp->m_writeio_log = ctx->iosizelog;
> -	}
> -
> -	return 0;
> +	return ret;
>  }
>  
>  struct proc_xfs_info {
>