[PATCH] md: merge md_enter_safemode into md_check_recovery

md_enter_safemode checks if it is time to mark the md superblock as 'clean'.
i.e.  if all writes have completed and a suitable delay has passed.

This is currently called from md_handle_safemode which in-turn is called
(almost) every time md_check_recovery is called, and from the end of
md_do_sync which causes the mddev->thread to run, which will always call
md_check_recovery as well.

So it doesn't need to be a separate function and fits quite well into
md_check_recovery.

The "almost" is because multipathd calls md_check_recovery but not
md_handle_safemode.  This is OK because the code from md_enter_safemode is a
no-op if mddev->safemode == 0, which it always is for a multipathd (providing
we don't allow it to be set to 2 on a signal...)

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 24 insertions, 34 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 60835dfd058e..c842e34d850e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3203,37 +3203,6 @@ void md_write_end(mddev_t *mddev)
         }
 }
 
-static inline void md_enter_safemode(mddev_t *mddev)
-{
-        if (!mddev->safemode) return;
-        if (mddev->safemode == 2 &&
-            (atomic_read(&mddev->writes_pending) || mddev->in_sync ||
-                    mddev->recovery_cp != MaxSector))
-                return; /* avoid the lock */
-        mddev_lock_uninterruptible(mddev);
-        if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
-            !mddev->in_sync && mddev->recovery_cp == MaxSector) {
-                mddev->in_sync = 1;
-                md_update_sb(mddev);
-        }
-        mddev_unlock(mddev);
-
-        if (mddev->safemode == 1)
-                mddev->safemode = 0;
-}
-
-void md_handle_safemode(mddev_t *mddev)
-{
-        if (signal_pending(current)) {
-                printk(KERN_INFO "md: %s in immediate safe mode\n",
-                        mdname(mddev));
-                mddev->safemode = 2;
-                flush_signals(current);
-        }
-        md_enter_safemode(mddev);
-}
-
-
 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
 
 #define SYNC_MARKS      10
@@ -3449,7 +3418,6 @@ static void md_do_sync(mddev_t *mddev)
                         mddev->recovery_cp = MaxSector;
         }
 
-        md_enter_safemode(mddev);
  skip:
         mddev->curr_resync = 0;
         wake_up(&resync_wait);
@@ -3490,14 +3458,37 @@ void md_check_recovery(mddev_t *mddev)
 
         if (mddev->ro)
                 return;
+
+        if (signal_pending(current)) {
+                if (mddev->pers->sync_request) {
+                        printk(KERN_INFO "md: %s in immediate safe mode\n",
+                               mdname(mddev));
+                        mddev->safemode = 2;
+                }
+                flush_signals(current);
+        }
+
         if ( ! (
                 mddev->sb_dirty ||
                 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
-                test_bit(MD_RECOVERY_DONE, &mddev->recovery)
+                test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
+                (mddev->safemode == 1) ||
+                (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
+                 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
                 ))
                 return;
+
         if (mddev_trylock(mddev)==0) {
                 int spares =0;
+
+                if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
+                    !mddev->in_sync && mddev->recovery_cp == MaxSector) {
+                        mddev->in_sync = 1;
+                        mddev->sb_dirty = 1;
+                }
+                if (mddev->safemode == 1)
+                        mddev->safemode = 0;
+
                 if (mddev->sb_dirty)
                         md_update_sb(mddev);
                 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
@@ -3741,7 +3732,6 @@ EXPORT_SYMBOL(md_error);
 EXPORT_SYMBOL(md_done_sync);
 EXPORT_SYMBOL(md_write_start);
 EXPORT_SYMBOL(md_write_end);
-EXPORT_SYMBOL(md_handle_safemode);
 EXPORT_SYMBOL(md_register_thread);
 EXPORT_SYMBOL(md_unregister_thread);
 EXPORT_SYMBOL(md_wakeup_thread);