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md-cluster: Defer MD reloading to mddev->thread 

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@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Guoqing Jiang 2015-12-21 10:51:00 +11:00 committed by NeilBrown
parent d323ef0f1a
commit 15858fa5b0
3 changed files with 11 additions and 1 deletions
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4
drivers/md/md-cluster.c
View File

@ -432,8 +432,10 @@ 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)

4
drivers/md/md.c
View File

@ -8286,6 +8286,7 @@ 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)
@ -8334,6 +8335,9 @@ 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) {

4
drivers/md/md.h
View File

@ -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)