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Commit 72f36d59 authored by NeilBrown's avatar NeilBrown
Browse files

md: refine reporting of resync/reshape delays. 



If 'resync_max' is set to 0 (as is often done when starting a
reshape, so the mdadm can remain in control during a sensitive
period), and if the reshape request is initially delayed because
another array using the same array is resyncing or reshaping etc,
when user-space cannot easily tell when the delay changes from being
due to a conflicting reshape, to being due to resync_max = 0.

So introduce a new state: (curr_resync == 3) to reflect this, make
sure it is visible both via /proc/mdstat and via the "sync_completed"
sysfs attribute, and ensure that the event transition from one delay
state to the other is properly notified.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent e56108d6

drivers/md/md.c

+18 −7
Original line number Diff line number Diff line
@@ -4400,6 +4400,10 @@ sync_completed_show(struct mddev *mddev, char *page) 
	if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))

		return sprintf(page, "none\n");



	if (mddev->curr_resync == 1 ||

	    mddev->curr_resync == 2)

		return sprintf(page, "delayed\n");



	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||

	    test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))

		max_sectors = mddev->resync_max_sectors;
@@ -6807,7 +6811,11 @@ static void status_resync(struct seq_file *seq, struct mddev * mddev) 
	int scale;

	unsigned int per_milli;



	resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);

	if (mddev->curr_resync <= 3)

		resync = 0;

	else

		resync = mddev->curr_resync

			- atomic_read(&mddev->recovery_active);



	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||

	    test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
@@ -7033,7 +7041,7 @@ static int md_seq_show(struct seq_file *seq, void *v) 
				if (mddev->curr_resync > 2) {

					status_resync(seq, mddev);

					seq_printf(seq, "\n      ");

				} else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)

				} else if (mddev->curr_resync >= 1)

					seq_printf(seq, "\tresync=DELAYED\n      ");

				else if (mddev->recovery_cp < MaxSector)

					seq_printf(seq, "\tresync=PENDING\n      ");
@@ -7423,8 +7431,11 @@ void md_do_sync(struct md_thread *thread) 
		       "md: resuming %s of %s from checkpoint.\n",

		       desc, mdname(mddev));

		mddev->curr_resync = j;

	}

	} else

		mddev->curr_resync = 3; /* no longer delayed */

	mddev->curr_resync_completed = j;

	sysfs_notify(&mddev->kobj, NULL, "sync_completed");

	md_new_event(mddev);



	blk_start_plug(&plug);

	while (j < max_sectors) {
@@ -7477,7 +7488,8 @@ void md_do_sync(struct md_thread *thread) 
			break;



		j += sectors;

		if (j>1) mddev->curr_resync = j;

		if (j > 2)

			mddev->curr_resync = j;

		mddev->curr_mark_cnt = io_sectors;

		if (last_check == 0)

			/* this is the earliest that rebuild will be
@@ -7599,8 +7611,6 @@ static int remove_and_add_spares(struct mddev *mddev) 
	int spares = 0;

	int removed = 0;



	mddev->curr_resync_completed = 0;



	rdev_for_each(rdev, mddev)

		if (rdev->raid_disk >= 0 &&

		    !test_bit(Blocked, &rdev->flags) &&
@@ -7791,6 +7801,7 @@ void md_check_recovery(struct mddev *mddev) 
		/* Set RUNNING before clearing NEEDED to avoid

		 * any transients in the value of "sync_action".

		 */

		mddev->curr_resync_completed = 0;

		set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);

		/* Clear some bits that don't mean anything, but

		 * might be left set
@@ -7804,7 +7815,7 @@ void md_check_recovery(struct mddev *mddev) 
		/* no recovery is running.

		 * remove any failed drives, then

		 * add spares if possible.

		 * Spare are also removed and re-added, to allow

		 * Spares are also removed and re-added, to allow

		 * the personality to fail the re-add.

		 */