md: update documentation for md/rdev/state sysfs interface

Previous patches in the bad block series extended behavior of
rdev's 'state' interface but lacked documentation update.
Fix it.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/Documentation/md.txt b/Documentation/md.txt
index 923a6bddce7c3c63f2966d40516e9fff0fb3c18d..fc94770f44abaf661f12577773cd803c6fd41370 100644 (file)
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -360,18 +360,20 @@ Each directory contains:
         A file recording the current state of the device in the array
        which can be a comma separated list of
              faulty   - device has been kicked from active use due to
-                         a detected fault
+                         a detected fault or it has unacknowledged bad
+                         blocks
              in_sync  - device is a fully in-sync member of the array
              writemostly - device will only be subject to read
                         requests if there are no other options.
                         This applies only to raid1 arrays.
-             blocked  - device has failed, metadata is "external",
-                        and the failure hasn't been acknowledged yet.
+             blocked  - device has failed, and the failure hasn't been
+                        acknowledged yet by the metadata handler.
                         Writes that would write to this device if
                         it were not faulty are blocked.
              spare    - device is working, but not a full member.
                         This includes spares that are in the process
                         of being recovered to
+             write_error - device has ever seen a write error.
        This list may grow in future.
        This can be written to.
        Writing "faulty"  simulates a failure on the device.
@@ -379,9 +381,11 @@ Each directory contains:
        Writing "writemostly" sets the writemostly flag.
        Writing "-writemostly" clears the writemostly flag.
        Writing "blocked" sets the "blocked" flag.
-       Writing "-blocked" clears the "blocked" flag and allows writes
-               to complete.
+       Writing "-blocked" clears the "blocked" flags and allows writes
+               to complete and possibly simulates an error.
        Writing "in_sync" sets the in_sync flag.
+       Writing "write_error" sets writeerrorseen flag.
+       Writing "-write_error" clears writeerrorseen flag.
 
        This file responds to select/poll. Any change to 'faulty'
        or 'blocked' causes an event.