Re: [PATCH 36/45] man: document XFS_FSOP_GEOM_FLAGS_ZONED

["Darrick J. Wong" <djwong@kernel.org>]

On Wed, Apr 09, 2025 at 09:55:39AM +0200, Christoph Hellwig wrote:
> Document the new zoned feature flag and the two new fields added
> with it.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  man/man2/ioctl_xfs_fsgeometry.2 | 21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/man/man2/ioctl_xfs_fsgeometry.2 b/man/man2/ioctl_xfs_fsgeometry.2
> index 502054f391e9..df7234e603d2 100644
> --- a/man/man2/ioctl_xfs_fsgeometry.2
> +++ b/man/man2/ioctl_xfs_fsgeometry.2
> @@ -50,7 +50,9 @@ struct xfs_fsop_geom {
>  	__u32         sick;
>  	__u32         checked;
>  	__u64         rgextents;
> -	__u64         reserved[16];
> +	__u64	      rtstart;
> +	__u64         rtreserved;
> +	__u64         reserved[14];
>  };
>  .fi
>  .in
> @@ -143,6 +145,20 @@ for more details.
>  .I rgextents
>  Is the number of RT extents in each rtgroup.
>  .PP
> +.I rtstart
> +Start of the internal RT device in fsblocks.  0 if an external log device

external RT device?

--D

> +is used.
> +This field is meaningful only if the flag
> +.B  XFS_FSOP_GEOM_FLAGS_ZONED
> +is set.
> +.PP
> +.I rtreserved
> +The amount of space in the realtime section that is reserved for internal use
> +by garbage collection and reorganization algorithms in fsblocks.
> +This field is meaningful only if the flag
> +.B  XFS_FSOP_GEOM_FLAGS_ZONED
> +is set.
> +.PP
>  .I reserved
>  is set to zero.
>  .SH FILESYSTEM FEATURE FLAGS
> @@ -221,6 +237,9 @@ Filesystem can exchange file contents atomically via XFS_IOC_EXCHANGE_RANGE.
>  .TP
>  .B XFS_FSOP_GEOM_FLAGS_METADIR
>  Filesystem contains a metadata directory tree.
> +.TP
> +.B XFS_FSOP_GEOM_FLAGS_ZONED
> +Filesystem uses the zoned allocator for the RT device.
>  .RE
>  .SH XFS METADATA HEALTH REPORTING
>  .PP
> -- 
> 2.47.2
> 
>