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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/