raid5: enable log for raid array with cache disk

Now log is safe to enable for raid array with cache disk

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>

2 files changed, 12 insertions, 0 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 122702d957a6..b0bf81d084fd 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6329,8 +6329,11 @@ static void raid5_free_percpu(struct r5conf *conf)
 
 static void free_conf(struct r5conf *conf)
 {
+        if (conf->log)
+                r5l_exit_log(conf->log);
         if (conf->shrinker.seeks)
                 unregister_shrinker(&conf->shrinker);
+
         free_thread_groups(conf);
         shrink_stripes(conf);
         raid5_free_percpu(conf);
@@ -6996,6 +6999,14 @@ static int run(struct mddev *mddev)
                                                 mddev->queue);
         }
 
+        if (journal_dev) {
+                char b[BDEVNAME_SIZE];
+
+                printk(KERN_INFO"md/raid:%s: using device %s as journal\n",
+                       mdname(mddev), bdevname(journal_dev->bdev, b));
+                r5l_init_log(conf, journal_dev);
+        }
+
         return 0;
 abort:
         md_unregister_thread(&mddev->thread);
diff --git a/include/uapi/linux/raid/md_p.h b/include/uapi/linux/raid/md_p.h
index 96e4196f9c79..c3e654c6d518 100644
--- a/include/uapi/linux/raid/md_p.h
+++ b/include/uapi/linux/raid/md_p.h
@@ -322,6 +322,7 @@ struct mdp_superblock_1 {
                                         |MD_FEATURE_NEW_OFFSET          \
                                         |MD_FEATURE_RECOVERY_BITMAP     \
                                         |MD_FEATURE_CLUSTERED           \
+                                        |MD_FEATURE_JOURNAL             \
                                         )
 
 struct r5l_payload_header {