Reloading of superblock must be performed under reconfig_mutex. However,
this cannot be done with md_reload_sb because it would deadlock with
the message DLM lock. So, we defer it in md_check_recovery() which is
executed by mddev->thread.
This introduces a new flag, MD_RELOAD_SB, which if set, will reload the
superblock. And good_device_nr is also added to 'struct mddev' which is
used to get the num of the good device within cluster raid.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
Signed-off-by: Guoqing Jiang <gqjiang@xxxxxxxx>
---
v2 changes: remove atomic and add good_device_nr to struct mddev
drivers/md/md-cluster.c | 4 +++-
drivers/md/md.c | 4 ++++
drivers/md/md.h | 4 ++++
3 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index b58374d..89343c3 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -431,8 +431,10 @@ static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
- md_reload_sb(mddev, le32_to_cpu(msg->raid_slot));
+ mddev->good_device_nr = le32_to_cpu(msg->raid_slot);
+ set_bit(MD_RELOAD_SB, &mddev->flags);
dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
+ md_wakeup_thread(mddev->thread);
}
static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 7ab9ed9..06066e67 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8260,6 +8260,7 @@ void md_check_recovery(struct mddev *mddev)
(mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
+ test_bit(MD_RELOAD_SB, &mddev->flags) ||
(mddev->external == 0 && mddev->safemode == 1) ||
(mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
&& !mddev->in_sync && mddev->recovery_cp == MaxSector)
@@ -8308,6 +8309,9 @@ void md_check_recovery(struct mddev *mddev)
rdev->raid_disk < 0)
md_kick_rdev_from_array(rdev);
}
+
+ if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags))
+ md_reload_sb(mddev, mddev->good_device_nr);
}
if (!mddev->external) {
diff --git a/drivers/md/md.h b/drivers/md/md.h
index f5b9aad..7a6da5c 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -235,6 +235,9 @@ struct mddev {
*/
#define MD_JOURNAL_CLEAN 5 /* A raid with journal is already clean */
#define MD_HAS_JOURNAL 6 /* The raid array has journal feature set */
+#define MD_RELOAD_SB 7 /* Reload the superblock because another node
+ * updated it.
+ */
int suspended;
atomic_t active_io;
@@ -465,6 +468,7 @@ struct mddev {
struct work_struct event_work; /* used by dm to report failure event */
void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev);
struct md_cluster_info *cluster_info;
+ unsigned int good_device_nr; /* good device num within cluster raid */
};
static inline int __must_check mddev_lock(struct mddev *mddev)
--
2.1.4
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