docs: add note about lsblk usage/free cols

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/Documentation/TODO b/Documentation/TODO
index 1aece4c6c2ee9effc75ce26a531ca35e07529133..73385dcd7a531169f47a51102b4421afbe676dc6 100644 (file)
--- a/Documentation/TODO
+++ b/Documentation/TODO
@@ -45,6 +45,10 @@ lsblk
     btrfs specific code to provide a better output for FS based stacks. Not sure.
     https://bugzilla.redhat.com/show_bug.cgi?id=1084453
 
+  - think about free/used space columns; the problem is that such info is about FS
+    and it may be confusing for end-users when FS to DEV mapping is not 1:1 (RAIDs, btrfs, 
+    ...)
+
 nsenter(1)
 ----------
  - read the default UID and GID from the target process.