New TODO items.

TODO

@@ -20,6 +20,8 @@ Something similar at "diff" and "dup".
 
 - Minor
 
+* When scanning dir, sort by inodes before calling stat.
+
 * Enable storing of creation time NTFS, crtime/birth time EXT4.
 But see: http://unix.stackexchange.com/questions/50177/birth-is-empty-on-ext4
 coreutils stat has an example, but it doesn't work in Linux (see lib/stat-time.h)
@@ -88,9 +90,19 @@ Or maybe we should allow parity never than content, but not viceversa.
 
 - Major
 
+* Use threads to scan all the disks at the same time.
+
 * Use Async IO for Linux (libaio).
 See thread: https://sourceforge.net/p/snapraid/discussion/1677233/thread/a300a10b/
 
+* Create a filesystem snapshot at every sync, and use it in all the other commands
+automatically.
+At the next sync, drop the old snapshot and create a new one.
+This should help recovering, because we'll have the exact copy used by sync.
+This feature can be enabled with a specific option, and available
+in Windows using Shadow Copy, and in Linux using Btrfs, and in a generic
+Unix using ZFS.
+
 * Split the parity in multiple files and allow it to coexist with data
 in the same disk.
 This is possible if the data in the same disk uses parity addresses not