md: add explicit method to signal the end of a reshape.

Currently raid5 (the only module that supports restriping)
notices that the reshape has finished be sync_request being
given a large value, and handles any cleanup them.

This patch changes it so md_check_recovery calls into an
explicit finish_reshape method as well.

The clean-up from sync_request can do things that need to be
done promptly, typically things local to the raid5_conf_t
structure.

The "finish_reshape" method is called under the mddev_lock
so it can do things involving reconfiguring the device.

This allows us to get rid of md_set_array_sectors_locked, which
would have caused a deadlock if you tried to stop and array
while a reshape was happening.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/md/md.h b/drivers/md/md.h
index d13e34f842e2..e9b7f54c24d6 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -317,6 +317,7 @@ struct mdk_personality
         sector_t (*size) (mddev_t *mddev, sector_t sectors, int raid_disks);
         int (*check_reshape) (mddev_t *mddev);
         int (*start_reshape) (mddev_t *mddev);
+        void (*finish_reshape) (mddev_t *mddev);
         int (*reconfig) (mddev_t *mddev, int layout, int chunk_size);
         /* quiesce moves between quiescence states
          * 0 - fully active
@@ -433,4 +434,3 @@ extern void md_new_event(mddev_t *mddev);
 extern int md_allow_write(mddev_t *mddev);
 extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
 extern void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors);
-extern void md_set_array_sectors_lock(mddev_t *mddev, sector_t array_sectors);