Make sure all changes to md/array_state are notified.
Changes in md/array_state could be of interest to a monitoring
program. So make sure all changes trigger a notification.
Exceptions:
changing active_idle to active is not reported because it
is frequent and not interesting.
changing active to active_idle is only reported on arrays
with externally managed metadata, as it is not interesting
otherwise.
Signed-off-by: Neil Brown <neilb@suse.de>
diff --git a/Documentation/md.txt b/Documentation/md.txt
index a8b4306..dca97ba 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -236,6 +236,11 @@
writing the word for the desired state, however some states
cannot be explicitly set, and some transitions are not allowed.
+ Select/poll works on this file. All changes except between
+ active_idle and active (which can be frequent and are not
+ very interesting) are notified. active->active_idle is
+ reported if the metadata is externally managed.
+
clear
No devices, no size, no level
Writing is equivalent to STOP_ARRAY ioctl
