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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