[PATCH] md: allow a manual resync with md

You can trigger a 'check' with
  echo check > /sys/block/mdX/md/scan_mode
or a check-and-repair errors with
  echo repair > /sys/block/mdX/md/scan_mode

and read the current state from the same file.

Note: personalities need to know the different between 'check' and 'repair',
but don't yet.  Until they do, 'check' will be the same as 'repair' and will
just do a normal resync pass.

Signed-off-by: Neil Brown <neilb@suse.de>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index d1dad32ebe07..efd04dca0abd 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -182,6 +182,8 @@ struct mddev_s
          * ERR:      and IO error was detected - abort the resync/recovery
          * INTR:     someone requested a (clean) early abort.
          * DONE:     thread is done and is waiting to be reaped
+         * REQUEST:  user-space has requested a sync (used with SYNC)
+         * CHECK:    user-space request for for check-only, no repair
          */
 #define MD_RECOVERY_RUNNING     0
 #define MD_RECOVERY_SYNC        1
@@ -189,6 +191,8 @@ struct mddev_s
 #define MD_RECOVERY_INTR        3
 #define MD_RECOVERY_DONE        4
 #define MD_RECOVERY_NEEDED      5
+#define MD_RECOVERY_REQUESTED   6
+#define MD_RECOVERY_CHECK       7
         unsigned long                   recovery;
 
         int                             in_sync;        /* know to not need resync */