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md-cluster: show array's status more accurate

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When resync or recovery is happening in one node,
other nodes don't show the appropriate info now.

For example, when create an array in master node
without "--assume-clean", then assemble the array
in slave nodes, you can see "resync=PENDING" when
read /proc/mdstat in slave nodes. However, the info
is confusing since "PENDING" status is introduced
for start array in read-only mode.

We introduce RESYNCING_REMOTE flag to indicate that
resync thread is running in remote node. The flags
is set when node receive RESYNCING msg. And we clear
the REMOTE flag in following cases:

1. resync or recover is finished in master node,
   which means slaves receive msg with both lo
   and hi are set to 0.
2. node continues resync/recovery in recover_bitmaps.
3. when resync_finish is called.

Then we show accurate information in status_resync
by check REMOTE flags and with other conditions.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Guoqing Jiang 2018-07-02 16:26:25 +08:00 committed by Shaohua Li
parent 010228e4a9
commit 0357ba27bd
3 changed files with 34 additions and 2 deletions
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18
drivers/md/md-cluster.c
View file

@ -338,8 +338,14 @@ static void recover_bitmaps(struct md_thread *thread)
/* wake up thread to continue resync in case resync
* is not finished */
if (mddev->recovery_cp != MaxSector) {
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
/*
* clear the REMOTE flag since we will launch
* resync thread in current node.
*/
clear_bit(MD_RESYNCING_REMOTE,
&mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
}
}
clear_bit:
@ -458,6 +464,11 @@ static void process_suspend_info(struct mddev *mddev,
struct suspend_info *s;
if (!hi) {
/*
* clear the REMOTE flag since resync or recovery is finished
* in remote node.
*/
clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
remove_suspend_info(mddev, slot);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
@ -586,6 +597,7 @@ static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
revalidate_disk(mddev->gendisk);
break;
case RESYNCING:
set_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
process_suspend_info(mddev, le32_to_cpu(msg->slot),
le64_to_cpu(msg->low),
le64_to_cpu(msg->high));
@ -1266,6 +1278,8 @@ static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
static int resync_finish(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
dlm_unlock_sync(cinfo->resync_lockres);
return resync_info_update(mddev, 0, 0);
}

17
drivers/md/md.c
View file

@ -7680,6 +7680,23 @@ static int status_resync(struct seq_file *seq, struct mddev *mddev)
resync -= atomic_read(&mddev->recovery_active);
if (resync == 0) {
if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) {
struct md_rdev *rdev;
rdev_for_each(rdev, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Faulty, &rdev->flags) &&
rdev->recovery_offset != MaxSector &&
rdev->recovery_offset) {
seq_printf(seq, "\trecover=REMOTE");
return 1;
}
if (mddev->reshape_position != MaxSector)
seq_printf(seq, "\treshape=REMOTE");
else
seq_printf(seq, "\tresync=REMOTE");
return 1;
}
if (mddev->recovery_cp < MaxSector) {
seq_printf(seq, "\tresync=PENDING");
return 1;

1
drivers/md/md.h
View file

@ -496,6 +496,7 @@ enum recovery_flags {
MD_RECOVERY_FROZEN, /* User request to abort, and not restart, any action */
MD_RECOVERY_ERROR, /* sync-action interrupted because io-error */
MD_RECOVERY_WAIT, /* waiting for pers->start() to finish */
MD_RESYNCING_REMOTE, /* remote node is running resync thread */
};
static inline int __must_check mddev_lock(struct mddev *mddev)