On 11/30/2014 04:31 AM, Shriramana Sharma wrote:
> I am confused with this: should I call it the "root subvol" or
> "top-level subvol" or "default subvol" or doesn't it matter? Are all
> subvols equal, or some are more equal than others [hark to Orwell's
> Animal Farm ;-)]?
>
> And more importantly, is the ID of the root subvol 0 or 5?
IIRC the real ID is 5. But if you pass 0, this value is converted in 5
$ grep BTRFS_FS_TREE_OBJECTID *.h
ctree.h:#define BTRFS_FS_TREE_OBJECTID 5ULL
[...]
And in super.c:
[...]
case Opt_subvolid:
num = match_strdup(&args[0]);
if (num) {
*subvol_objectid = memparse(num, NULL);
kfree(num);
/* we want the original fs_tree */
if (!*subvol_objectid)
*subvol_objectid =
BTRFS_FS_TREE_OBJECTID;
[...]
--
gpg @keyserver.linux.it: Goffredo Baroncelli <kreijackATinwind.it>
Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
