On Sat, Nov 05, 2016 at 01:26:34PM -0400, jeffm@xxxxxxxx wrote: > From: Jeff Mahoney <jeffm@xxxxxxxx> > > Commit 3de4586c527 (Btrfs: Allow subvolumes and snapshots anywhere > in the directory tree) introduced the current system of placing > snapshots in the directory tree. It also introduced the behavior of > creating the snapshot and then creating the directory entries for it. > > We've kept this code around for compatibility reasons, but it turns > out that no file systems with the old tree_root based snapshots can > be mounted on newer (>= 2009) kernels anyway. About a month after the > above commit, commit 2a7108ad89e (Btrfs: rev the disk format for the > inode compat and csum selection changes) landed, changing the superblock > magic number. > > As a result, we know that we'll never encounter tree_root-based dirents > or have to deal with skipping our own snapshot dirents. Since that > also means that we're now only iterating over DIR_INDEX items, which only > contain one directory entry per leaf item, we don't need to loop over > the leaf item contents anymore either. > > Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx> Reviewed-by: David Sterba <dsterba@xxxxxxxx> -- 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
