[PATCH] md: allow dirty raid[456] arrays to be started at boot

See patch to md.txt for more details

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 334ff7a07283..53a0f2ce76c8 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1904,10 +1904,17 @@ static int run(mddev_t *mddev)
 
         if (mddev->degraded == 1 &&
             mddev->recovery_cp != MaxSector) {
-                printk(KERN_ERR 
-                        "raid5: cannot start dirty degraded array for %s\n",
-                        mdname(mddev));
-                goto abort;
+                if (mddev->ok_start_degraded)
+                        printk(KERN_WARNING
+                               "raid5: starting dirty degraded array: %s"
+                               "- data corruption possible.\n",
+                               mdname(mddev));
+                else {
+                        printk(KERN_ERR
+                               "raid5: cannot start dirty degraded array for %s\n",
+                               mdname(mddev));
+                        goto abort;
+                }
         }
 
         {