[PATCH] dm: log: rename complete_resync_work

The complete_resync_work function only provides the ability to change an
out-of-sync region to in-sync.  This patch enhances the function to allow us
to change the status from in-sync to out-of-sync as well, something that is
needed when a mirror write to one of the devices or an initial resync on a
given region fails.

Signed-off-by: Jonathan E Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: dm-devel@redhat.com
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 26 insertions, 16 deletions

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 64b764bd02cc..ce5c5d6fc107 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -549,16 +549,19 @@ static int core_get_resync_work(struct dirty_log *log, region_t *region)
         return 1;
 }
 
-static void core_complete_resync_work(struct dirty_log *log, region_t region,
-                                      int success)
+static void core_set_region_sync(struct dirty_log *log, region_t region,
+                                 int in_sync)
 {
         struct log_c *lc = (struct log_c *) log->context;
 
         log_clear_bit(lc, lc->recovering_bits, region);
-        if (success) {
+        if (in_sync) {
                 log_set_bit(lc, lc->sync_bits, region);
                 lc->sync_count++;
-        }
+        } else if (log_test_bit(lc->sync_bits, region)) {
+                lc->sync_count--;
+                log_clear_bit(lc, lc->sync_bits, region);
+        }
 }
 
 static region_t core_get_sync_count(struct dirty_log *log)
@@ -625,7 +628,7 @@ static struct dirty_log_type _core_type = {
         .mark_region = core_mark_region,
         .clear_region = core_clear_region,
         .get_resync_work = core_get_resync_work,
-        .complete_resync_work = core_complete_resync_work,
+        .set_region_sync = core_set_region_sync,
         .get_sync_count = core_get_sync_count,
         .status = core_status,
 };
@@ -644,7 +647,7 @@ static struct dirty_log_type _disk_type = {
         .mark_region = core_mark_region,
         .clear_region = core_clear_region,
         .get_resync_work = core_get_resync_work,
-        .complete_resync_work = core_complete_resync_work,
+        .set_region_sync = core_set_region_sync,
         .get_sync_count = core_get_sync_count,
         .status = disk_status,
 };
diff --git a/drivers/md/dm-log.h b/drivers/md/dm-log.h
index 5ae5309ebf28..86a301c8daf1 100644
--- a/drivers/md/dm-log.h
+++ b/drivers/md/dm-log.h
@@ -90,12 +90,12 @@ struct dirty_log_type {
         int (*get_resync_work)(struct dirty_log *log, region_t *region);
 
         /*
-         * This notifies the log that the resync of an area has
-         * been completed.  The log should then mark this region
-         * as CLEAN.
+         * This notifies the log that the resync status of a region
+         * has changed.  It also clears the region from the recovering
+         * list (if present).
          */
-        void (*complete_resync_work)(struct dirty_log *log,
-                                     region_t region, int success);
+        void (*set_region_sync)(struct dirty_log *log,
+                                region_t region, int in_sync);
 
         /*
          * Returns the number of regions that are in sync.
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 3b3f4c9c3f09..23a642619bed 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -344,6 +344,17 @@ static void dispatch_bios(struct mirror_set *ms, struct bio_list *bio_list)
         }
 }
 
+static void complete_resync_work(struct region *reg, int success)
+{
+        struct region_hash *rh = reg->rh;
+
+        rh->log->type->set_region_sync(rh->log, reg->key, success);
+        dispatch_bios(rh->ms, &reg->delayed_bios);
+        if (atomic_dec_and_test(&rh->recovery_in_flight))
+                wake_up_all(&_kmirrord_recovery_stopped);
+        up(&rh->recovery_count);
+}
+
 static void rh_update_states(struct region_hash *rh)
 {
         struct region *reg, *next;
@@ -383,11 +394,7 @@ static void rh_update_states(struct region_hash *rh)
          */
         list_for_each_entry_safe (reg, next, &recovered, list) {
                 rh->log->type->clear_region(rh->log, reg->key);
-                rh->log->type->complete_resync_work(rh->log, reg->key, 1);
-                dispatch_bios(rh->ms, &reg->delayed_bios);
-                if (atomic_dec_and_test(&rh->recovery_in_flight))
-                        wake_up_all(&_kmirrord_recovery_stopped);
-                up(&rh->recovery_count);
+                complete_resync_work(reg, 1);
                 mempool_free(reg, rh->region_pool);
         }