Re: [PATCH v2] statx.2: Document STATX_SUBVOL

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Hi Kent, John,

On Thu, Jun 20, 2024 at 01:00:17PM GMT, John Garry wrote:
> From: Kent Overstreet <kent.overstreet@xxxxxxxxx>
> 
> Document the new statx.stx_subvol field.
> 
> This would be clearer if we had a proper API for walking subvolumes that
> we could refer to, but that's still coming.
> 
> Link: https://lore.kernel.org/linux-fsdevel/20240308022914.196982-1-kent.overstreet@xxxxxxxxx/
> Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
> [jpg: mention supported FSes and formatting improvements]
> Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>

Patch applied.  Thanks!

Have a lovely day!
Alex

> ---
> I am just sending a new version as I want to post more statx updates
> which are newer than stx_subvol.
> diff --git a/man/man2/statx.2 b/man/man2/statx.2
> index 0dcf7e20b..5b17d9afe 100644
> --- a/man/man2/statx.2
> +++ b/man/man2/statx.2
> @@ -68,6 +68,8 @@ struct statx {
>      /* Direct I/O alignment restrictions */
>      __u32 stx_dio_mem_align;
>      __u32 stx_dio_offset_align;
> +\&
> +    __u64 stx_subvol;      /* Subvolume identifier */
>  };
>  .EE
>  .in
> @@ -255,6 +257,8 @@ STATX_ALL	The same as STATX_BASIC_STATS | STATX_BTIME.
>  STATX_MNT_ID	Want stx_mnt_id (since Linux 5.8)
>  STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align
>  	(since Linux 6.1; support varies by filesystem)
> +STATX_SUBVOL	Want stx_subvol
> +	(since Linux 6.10; support varies by filesystem)
>  .TE
>  .in
>  .P
> @@ -439,6 +443,14 @@ or 0 if direct I/O is not supported on this file.
>  This will only be nonzero if
>  .I stx_dio_mem_align
>  is nonzero, and vice versa.
> +.TP
> +.I stx_subvol
> +Subvolume number of the current file.
> +.IP
> +Subvolumes are fancy directories,
> +i.e. they form a tree structure that may be walked recursively.
> +Support varies by filesystem;
> +it is supported by bcachefs and btrfs since Linux 6.10.
>  .P
>  For further information on the above fields, see
>  .BR inode (7).
> -- 
> 2.31.1
> 

-- 
<https://www.alejandro-colomar.es/>

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