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

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On Thu, Jun 27, 2024 at 01:05:38PM GMT, John Garry wrote:
> On 20/06/2024 14:00, John Garry wrote:

Hi John,

> Hi Alex,
> 
> Is there anything else required to get this picked up?
> 
> I have some more dependent changes waiting.

No; I'll try to review it tonight or tomorrow.  Thanks for the ping!
I'm doing many things these days, and forgot about this patch.

Have a lovely day!
Alex

> 
> Thanks
> 
> > 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>
> > ---
> > 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).
> 

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

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