linux-kernel - Re: [RFC v2 13/14] xfs: add an experimental CONFIG_XFS

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Date: Tue, 13 Feb 2024 08:39:30 -0800
From: "Darrick J. Wong" <djwong@...nel.org>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
Cc: linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	mcgrof@...nel.org, gost.dev@...sung.com, akpm@...ux-foundation.org,
	kbusch@...nel.org, chandan.babu@...cle.com, p.raghav@...sung.com,
	linux-kernel@...r.kernel.org, hare@...e.de, willy@...radead.org,
	linux-mm@...ck.org, david@...morbit.com
Subject: Re: [RFC v2 13/14] xfs: add an experimental CONFIG_XFS_LBS option

On Tue, Feb 13, 2024 at 10:37:12AM +0100, Pankaj Raghav (Samsung) wrote:
> From: Pankaj Raghav <p.raghav@...sung.com>
> 
> Add an experimental CONFIG_XFS_LBS option to enable LBS support in XFS.
> Retain the ASSERT for PAGE_SHIFT if CONFIG_XFS_LBS is not enabled.
> 
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>

With the changes I suggested in the next patch,
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

(I think you ought to combine this patch and the next patch after
improving the EXPERIMENTAL log messaging.)

--D

> ---
>  fs/xfs/Kconfig     | 11 +++++++++++
>  fs/xfs/xfs_mount.c |  4 +++-
>  2 files changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig
> index 567fb37274d3..6b0db2f7dc13 100644
> --- a/fs/xfs/Kconfig
> +++ b/fs/xfs/Kconfig
> @@ -216,3 +216,14 @@ config XFS_ASSERT_FATAL
>  	  result in warnings.
>  
>  	  This behavior can be modified at runtime via sysfs.
> +
> +config XFS_LBS
> +	bool "XFS large block size support (EXPERIMENTAL)"
> +	depends on XFS_FS
> +	help
> +	  Set Y to enable support for filesystem block size > system's
> +	  base page size.
> +
> +	  This feature is considered EXPERIMENTAL.  Use with caution!
> +
> +	  If unsure, say N.
> diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> index bfbaaecaf668..596aa2cdefbc 100644
> --- a/fs/xfs/xfs_mount.c
> +++ b/fs/xfs/xfs_mount.c
> @@ -131,11 +131,13 @@ xfs_sb_validate_fsb_count(
>  	xfs_sb_t	*sbp,
>  	uint64_t	nblocks)
>  {
> -	ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
>  	ASSERT(sbp->sb_blocklog >= BBSHIFT);
>  	unsigned long mapping_count;
>  	uint64_t bytes = nblocks << sbp->sb_blocklog;
>  
> +	if (!IS_ENABLED(CONFIG_XFS_LBS))
> +		ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
> +
>  	mapping_count = bytes >> PAGE_SHIFT;
>  
>  	/* Limited by ULONG_MAX of page cache index */
> -- 
> 2.43.0
> 
>