dm log: split suspend

There are now two phases to a suspend in device-mapper -
presuspend and postsuspend.  This patch removes the
single 'suspend' in the logging API and replaces it with
'presuspend' and 'postsuspend' functions to align it
better with core device-mapper.

A subsequent patch will make use of 'presuspend'.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

3 files changed, 4 insertions, 3 deletions

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index a66428d860f..072ee4353ea 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -696,7 +696,7 @@ static struct dirty_log_type _disk_type = {
         .module = THIS_MODULE,
         .ctr = disk_ctr,
         .dtr = disk_dtr,
-        .suspend = disk_flush,
+        .postsuspend = disk_flush,
         .resume = disk_resume,
         .get_region_size = core_get_region_size,
         .is_clean = core_is_clean,
diff --git a/drivers/md/dm-log.h b/drivers/md/dm-log.h
index 86a301c8daf..3fae87eb596 100644
--- a/drivers/md/dm-log.h
+++ b/drivers/md/dm-log.h
@@ -32,7 +32,8 @@ struct dirty_log_type {
          * There are times when we don't want the log to touch
          * the disk.
          */
-        int (*suspend)(struct dirty_log *log);
+        int (*presuspend)(struct dirty_log *log);
+        int (*postsuspend)(struct dirty_log *log);
         int (*resume)(struct dirty_log *log);
 
         /*
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 2b2ca371e20..8aafbb7ec57 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1305,7 +1305,7 @@ static void mirror_postsuspend(struct dm_target *ti)
         wait_event(_kmirrord_recovery_stopped,
                    !atomic_read(&ms->rh.recovery_in_flight));
 
-        if (log->type->suspend && log->type->suspend(log))
+        if (log->type->postsuspend && log->type->postsuspend(log))
                 /* FIXME: need better error handling */
                 DMWARN("log suspend failed");
 }