md: allow setting newly added device to 'in_sync' via sysfs.

When adding devices to an active array via sysfs, there is currently
no way to mark a device as 'in-sync' which is useful when
incrementally assembling an array.

So add that option.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index ed5727c089a..298731b8e95 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2086,6 +2086,7 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
          *  -writemostly - clears write_mostly
          *  blocked - sets the Blocked flag
          *  -blocked - clears the Blocked flag
+         *  insync - sets Insync providing device isn't active
          */
         int err = -EINVAL;
         if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
@@ -2118,6 +2119,9 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
                 md_wakeup_thread(rdev->mddev->thread);
 
                 err = 0;
+        } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
+                set_bit(In_sync, &rdev->flags);
+                err = 0;
         }
         if (!err && rdev->sysfs_state)
                 sysfs_notify_dirent(rdev->sysfs_state);
@@ -2190,7 +2194,7 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
         } else if (rdev->mddev->pers) {
                 mdk_rdev_t *rdev2;
                 /* Activating a spare .. or possibly reactivating
-                 * if we every get bitmaps working here.
+                 * if we ever get bitmaps working here.
                  */
 
                 if (rdev->raid_disk != -1)