Re: [Lsf-pc] [LSF TOPIC] statx extensions for subvol/snapshot filesystems & more

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On Mon, Feb 26, 2024 at 10:27 AM Miklos Szeredi via Lsf-pc
<lsf-pc@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, 22 Feb 2024 at 17:08, Jan Kara <jack@xxxxxxx> wrote:
> > > If we are going to start fixing userspace, then we better make sure to
> > > use the right interfaces, that won't have issues in the future.
> >
> > I agree we should give this a good thought which identification of a
> > filesystem is the best.
> To find mount boundaries statx.stx_mnt_id (especially with
> STATX_MNT_ID_UNIQUE) is perfect.
> By supplying stx_mnt_id to statmount(2) it's possible to get the
> device number associated with that filesystem (statmount.sb_dev_*).  I
> think it's what Josef wants btrfs to return as st_dev.
> And statx could return that in stx_dev_*, with an interface feature
> flag, same as we've done with stx_mnt_id.  I.e. STATX_DEV_NOHACK would
> force the vfs to replace anything the filesystem put in with
> sb->s_dev.


I would really like to have this discussion at LSFMM and it would be great
if you could join it remotely.

Care to fill out the form and ask for a virtual invite so that we have
you on our list?


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