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Commit 474af965 authored by NeilBrown's avatar NeilBrown
Browse files

md/raid5: move some more common code into handle_stripe 



The RAID6 version of this code is usable for RAID5 providing:
  - we test "conf->max_degraded" rather than "2" as appropriate
  - we make sure s->failed_num[1] is meaningful (and not '-1')
    when s->failed > 1

The 'return 1' must become 'goto finish' in the new location.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
Reviewed-by: default avatarNamhyung Kim <namhyung@gmail.com>
parent 84789554

drivers/md/raid5.c

+67 −113
Original line number Diff line number Diff line
@@ -2968,63 +2968,14 @@ static int handle_stripe5(struct stripe_head *sh, struct stripe_head_state *s) 
		if (test_bit(R5_ReadError, &dev->flags))

			clear_bit(R5_Insync, &dev->flags);

		if (!test_bit(R5_Insync, &dev->flags)) {

			if (s->failed < 2)

				s->failed_num[s->failed] = i;

			s->failed++;

			s->failed_num[0] = i;

		}

	}

	spin_unlock_irq(&conf->device_lock);

	rcu_read_unlock();



	if (unlikely(s->blocked_rdev)) {

		if (s->syncing || s->expanding || s->expanded ||

		    s->to_write || s->written) {

			set_bit(STRIPE_HANDLE, &sh->state);

			return 1;

		}

		/* There is nothing for the blocked_rdev to block */

		rdev_dec_pending(s->blocked_rdev, conf->mddev);

		s->blocked_rdev = NULL;

	}



	if (s->to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {

		set_bit(STRIPE_OP_BIOFILL, &s->ops_request);

		set_bit(STRIPE_BIOFILL_RUN, &sh->state);

	}



	pr_debug("locked=%d uptodate=%d to_read=%d"

		" to_write=%d failed=%d failed_num=%d\n",

		s->locked, s->uptodate, s->to_read, s->to_write,

		s->failed, s->failed_num[0]);

	/* check if the array has lost two devices and, if so, some requests might

	 * need to be failed

	 */

	if (s->failed > 1 && s->to_read+s->to_write+s->written)

		handle_failed_stripe(conf, sh, s, disks, &s->return_bi);

	if (s->failed > 1 && s->syncing) {

		md_done_sync(conf->mddev, STRIPE_SECTORS,0);

		clear_bit(STRIPE_SYNCING, &sh->state);

		s->syncing = 0;

	}



	/* might be able to return some write requests if the parity block

	 * is safe, or on a failed drive

	 */

	dev = &sh->dev[sh->pd_idx];

	if (s->written &&

	    ((test_bit(R5_Insync, &dev->flags) &&

	      !test_bit(R5_LOCKED, &dev->flags) &&

	      test_bit(R5_UPTODATE, &dev->flags)) ||

	     (s->failed == 1 && s->failed_num[0] == sh->pd_idx)))

		handle_stripe_clean_event(conf, sh, disks, &s->return_bi);



	/* Now we might consider reading some blocks, either to check/generate

	 * parity, or to satisfy requests

	 * or to load a block that is being partially written.

	 */

	if (s->to_read || s->non_overwrite ||

	    (s->syncing && (s->uptodate + s->compute < disks)) || s->expanding)

		handle_stripe_fill(sh, s, disks);



	return 0;

}
@@ -3032,8 +2983,8 @@ static int handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s) 
{

	raid5_conf_t *conf = sh->raid_conf;

	int disks = sh->disks;

	int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx;

	struct r5dev *dev, *pdev, *qdev;

	struct r5dev *dev;

	int i;



	/* Now to look around and see what can be done */
@@ -3107,65 +3058,6 @@ static int handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s) 
	spin_unlock_irq(&conf->device_lock);

	rcu_read_unlock();



	if (unlikely(s->blocked_rdev)) {

		if (s->syncing || s->expanding || s->expanded ||

		    s->to_write || s->written) {

			set_bit(STRIPE_HANDLE, &sh->state);

			return 1;

		}

		/* There is nothing for the blocked_rdev to block */

		rdev_dec_pending(s->blocked_rdev, conf->mddev);

		s->blocked_rdev = NULL;

	}



	if (s->to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {

		set_bit(STRIPE_OP_BIOFILL, &s->ops_request);

		set_bit(STRIPE_BIOFILL_RUN, &sh->state);

	}



	pr_debug("locked=%d uptodate=%d to_read=%d"

	       " to_write=%d failed=%d failed_num=%d,%d\n",

	       s->locked, s->uptodate, s->to_read, s->to_write, s->failed,

	       s->failed_num[0], s->failed_num[1]);

	/* check if the array has lost >2 devices and, if so, some requests

	 * might need to be failed

	 */

	if (s->failed > 2 && s->to_read+s->to_write+s->written)

		handle_failed_stripe(conf, sh, s, disks, &s->return_bi);

	if (s->failed > 2 && s->syncing) {

		md_done_sync(conf->mddev, STRIPE_SECTORS,0);

		clear_bit(STRIPE_SYNCING, &sh->state);

		s->syncing = 0;

	}



	/*

	 * might be able to return some write requests if the parity blocks

	 * are safe, or on a failed drive

	 */

	pdev = &sh->dev[pd_idx];

	s->p_failed = (s->failed >= 1 && s->failed_num[0] == pd_idx)

		|| (s->failed >= 2 && s->failed_num[1] == pd_idx);

	qdev = &sh->dev[qd_idx];

	s->q_failed = (s->failed >= 1 && s->failed_num[0] == qd_idx)

		|| (s->failed >= 2 && s->failed_num[1] == qd_idx);



	if (s->written &&

	    (s->p_failed || ((test_bit(R5_Insync, &pdev->flags)

			     && !test_bit(R5_LOCKED, &pdev->flags)

			     && test_bit(R5_UPTODATE, &pdev->flags)))) &&

	    (s->q_failed || ((test_bit(R5_Insync, &qdev->flags)

			     && !test_bit(R5_LOCKED, &qdev->flags)

			     && test_bit(R5_UPTODATE, &qdev->flags)))))

		handle_stripe_clean_event(conf, sh, disks, &s->return_bi);



	/* Now we might consider reading some blocks, either to check/generate

	 * parity, or to satisfy requests

	 * or to load a block that is being partially written.

	 */

	if (s->to_read || s->non_overwrite || (s->to_write && s->failed) ||

	    (s->syncing && (s->uptodate + s->compute < disks)) || s->expanding)

		handle_stripe_fill(sh, s, disks);



	return 0;

}
@@ -3173,10 +3065,11 @@ static void handle_stripe(struct stripe_head *sh) 
{

	struct stripe_head_state s;

	int done;

	raid5_conf_t *conf = sh->raid_conf;

	int i;

	int prexor;

	int disks = sh->disks;

	raid5_conf_t *conf = sh->raid_conf;

	struct r5dev *pdev, *qdev;



	clear_bit(STRIPE_HANDLE, &sh->state);

	if (test_and_set_bit(STRIPE_ACTIVE, &sh->state)) {
@@ -3213,6 +3106,67 @@ static void handle_stripe(struct stripe_head *sh) 
	if (done)

		goto finish;



	if (unlikely(s.blocked_rdev)) {

		if (s.syncing || s.expanding || s.expanded ||

		    s.to_write || s.written) {

			set_bit(STRIPE_HANDLE, &sh->state);

			goto finish;

		}

		/* There is nothing for the blocked_rdev to block */

		rdev_dec_pending(s.blocked_rdev, conf->mddev);

		s.blocked_rdev = NULL;

	}



	if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {

		set_bit(STRIPE_OP_BIOFILL, &s.ops_request);

		set_bit(STRIPE_BIOFILL_RUN, &sh->state);

	}



	pr_debug("locked=%d uptodate=%d to_read=%d"

	       " to_write=%d failed=%d failed_num=%d,%d\n",

	       s.locked, s.uptodate, s.to_read, s.to_write, s.failed,

	       s.failed_num[0], s.failed_num[1]);

	/* check if the array has lost more than max_degraded devices and,

	 * if so, some requests might need to be failed.

	 */

	if (s.failed > conf->max_degraded && s.to_read+s.to_write+s.written)

		handle_failed_stripe(conf, sh, &s, disks, &s.return_bi);

	if (s.failed > conf->max_degraded && s.syncing) {

		md_done_sync(conf->mddev, STRIPE_SECTORS, 0);

		clear_bit(STRIPE_SYNCING, &sh->state);

		s.syncing = 0;

	}



	/*

	 * might be able to return some write requests if the parity blocks

	 * are safe, or on a failed drive

	 */

	pdev = &sh->dev[sh->pd_idx];

	s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx)

		|| (s.failed >= 2 && s.failed_num[1] == sh->pd_idx);

	qdev = &sh->dev[sh->qd_idx];

	s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx)

		|| (s.failed >= 2 && s.failed_num[1] == sh->qd_idx)

		|| conf->level < 6;



	if (s.written &&

	    (s.p_failed || ((test_bit(R5_Insync, &pdev->flags)

			     && !test_bit(R5_LOCKED, &pdev->flags)

			     && test_bit(R5_UPTODATE, &pdev->flags)))) &&

	    (s.q_failed || ((test_bit(R5_Insync, &qdev->flags)

			     && !test_bit(R5_LOCKED, &qdev->flags)

			     && test_bit(R5_UPTODATE, &qdev->flags)))))

		handle_stripe_clean_event(conf, sh, disks, &s.return_bi);



	/* Now we might consider reading some blocks, either to check/generate

	 * parity, or to satisfy requests

	 * or to load a block that is being partially written.

	 */

	if (s.to_read || s.non_overwrite

	    || (conf->level == 6 && s.to_write && s.failed)

	    || (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding)

		handle_stripe_fill(sh, &s, disks);



	/* Now we check to see if any write operations have recently

	 * completed

	 */