[PATCH] xfs: Improve CONFIG_XFS_RT Kconfig help

[PATCH] xfs: Improve CONFIG_XFS_RT Kconfig help

[Damien Le Moal]

Improve the description of the XFS_RT configuration option to document
that this option is required for zoned block devices.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
---
 fs/xfs/Kconfig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig
index ae0ca6858496..68724dec3d19 100644
--- a/fs/xfs/Kconfig
+++ b/fs/xfs/Kconfig
@@ -118,6 +118,15 @@ config XFS_RT
 
 	  See the xfs man page in section 5 for additional information.
 
+	  This option is mandatory to support zoned block devices. For these
+	  devices, the realtime subvolume must be backed by a zoned block
+	  device and a regular block device used as the main device (for
+	  metadata). If the zoned block device is a host-managed SMR hard-disk
+	  containing conventional zones at the beginning of its address space,
+	  XFS will use the disk conventional zones as the main device and the
+	  remaining sequential write required zones as the backing storage for
+	  the realtime subvolume.
+
 	  If unsure, say N.
 
 config XFS_DRAIN_INTENTS
-- 
2.50.1

Re: [PATCH] xfs: Improve CONFIG_XFS_RT Kconfig help

[Christoph Hellwig]

On Thu, Aug 07, 2025 at 02:56:30PM +0900, Damien Le Moal wrote:
> +	  This option is mandatory to support zoned block devices. For these
> +	  devices, the realtime subvolume must be backed by a zoned block
> +	  device and a regular block device used as the main device (for
> +	  metadata). If the zoned block device is a host-managed SMR hard-disk
> +	  containing conventional zones at the beginning of its address space,
> +	  XFS will use the disk conventional zones as the main device and the
> +	  remaining sequential write required zones as the backing storage for
> +	  the realtime subvolume.

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH] xfs: Improve CONFIG_XFS_RT Kconfig help

[Carlos Maiolino]

On Thu, Aug 07, 2025 at 02:56:30PM +0900, Damien Le Moal wrote:
> Improve the description of the XFS_RT configuration option to document
> that this option is required for zoned block devices.
> 
> Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
> ---
>  fs/xfs/Kconfig | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig
> index ae0ca6858496..68724dec3d19 100644
> --- a/fs/xfs/Kconfig
> +++ b/fs/xfs/Kconfig
> @@ -118,6 +118,15 @@ config XFS_RT
> 
>  	  See the xfs man page in section 5 for additional information.
> 
> +	  This option is mandatory to support zoned block devices. For these
> +	  devices, the realtime subvolume must be backed by a zoned block
> +	  device and a regular block device used as the main device (for
> +	  metadata). If the zoned block device is a host-managed SMR hard-disk
> +	  containing conventional zones at the beginning of its address space,
> +	  XFS will use the disk conventional zones as the main device and the
> +	  remaining sequential write required zones as the backing storage for
> +	  the realtime subvolume.
> +
>  	  If unsure, say N.

Looks good!

Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>

> 
>  config XFS_DRAIN_INTENTS
> --
> 2.50.1
> 
>