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SubjectRe: [PATCH v2 5/6] Btrfs: unify subvol= and subvolid= mounting
On Mon, May 11, 2015 at 05:37:24PM +0200, David Sterba wrote:
> On Thu, Apr 09, 2015 at 02:34:55PM -0700, Omar Sandoval wrote:
> > @@ -1321,7 +1438,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
> > return ERR_PTR(error);
> > }
> >
> > - if (subvol_name) {
> > + if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) {
> > /* mount_subvol() will free subvol_name. */
> > return mount_subvol(subvol_name, subvol_objectid, flags,
> > device_name, data);
>
> The story is that I've used this patchset as a base for my per-subvolume
> mount flags because it made the mount path cleaner, so it's possible that
> the issue I saw was related to my changes.
>
> The modified 'if' above did not catch subvol_objectid == 0. I'm not sure
> now how it got there, btrfs_parse_early_options recognizes 0 and
> switches it to 5.
>
> My testing script is quite simple and does only
>
> mount -o compress-force=lzo,subvol=/subv1 $dev mnt
> mount -o compress-force=zlib,subvol=/subv2 $dev mnt2
>
> after mkfs. The first pass would resolve the path to the subvol root and
> replace the options with subvolid=0, calls mount_subvol, vfs_kern_mount
> than in turn goes back to btrfs_mount. Unless I'm missing something,
> this should also work, because parse_early_options is called again and
> does subvolid=0 -> subvol_objectid=5 . Oh well, more debugging needed,
> not a blocker for this patchset.

Hm, yeah, I don't see how that would happen. Do you have that patchset
up anywhere?

--
Omar


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