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Commit 24afd80d authored by NeilBrown's avatar NeilBrown
Browse files

md/raid10: handle recovery of replacement devices. 



If there is a replacement device, then recover to it,
reading from any drives - maybe the one being replaced, maybe not.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 9ad1aefc

drivers/md/raid10.c

+80 −30
Original line number Diff line number Diff line
@@ -1843,7 +1843,7 @@ static void recovery_request_write(struct mddev *mddev, struct r10bio *r10_bio) 
{

	struct r10conf *conf = mddev->private;

	int d;

	struct bio *wbio;

	struct bio *wbio, *wbio2;



	if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) {

		fix_recovery_read_error(r10_bio);
@@ -1855,13 +1855,21 @@ static void recovery_request_write(struct mddev *mddev, struct r10bio *r10_bio) 
	 * share the pages with the first bio

	 * and submit the write request

	 */

	wbio = r10_bio->devs[1].bio;

	d = r10_bio->devs[1].devnum;



	wbio = r10_bio->devs[1].bio;

	wbio2 = r10_bio->devs[1].repl_bio;

	if (wbio->bi_end_io) {

		atomic_inc(&conf->mirrors[d].rdev->nr_pending);

		md_sync_acct(conf->mirrors[d].rdev->bdev, wbio->bi_size >> 9);

		generic_make_request(wbio);

	}

	if (wbio2 && wbio2->bi_end_io) {

		atomic_inc(&conf->mirrors[d].replacement->nr_pending);

		md_sync_acct(conf->mirrors[d].replacement->bdev,

			     wbio2->bi_size >> 9);

		generic_make_request(wbio2);

	}

}





/*
@@ -2590,23 +2598,30 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, 
			sector_t sect;

			int must_sync;

			int any_working;

			struct mirror_info *mirror = &conf->mirrors[i];



			if (conf->mirrors[i].rdev == NULL ||

			    test_bit(In_sync, &conf->mirrors[i].rdev->flags)) 

			if ((mirror->rdev == NULL ||

			     test_bit(In_sync, &mirror->rdev->flags))

			    &&

			    (mirror->replacement == NULL ||

			     test_bit(Faulty,

				      &mirror->replacement->flags)))

				continue;



			still_degraded = 0;

			/* want to reconstruct this device */

			rb2 = r10_bio;

			sect = raid10_find_virt(conf, sector_nr, i);

			/* Unless we are doing a full sync, we only need

			 * to recover the block if it is set in the bitmap

			/* Unless we are doing a full sync, or a replacement

			 * we only need to recover the block if it is set in

			 * the bitmap

			 */

			must_sync = bitmap_start_sync(mddev->bitmap, sect,

						      &sync_blocks, 1);

			if (sync_blocks < max_sync)

				max_sync = sync_blocks;

			if (!must_sync &&

			    mirror->replacement == NULL &&

			    !conf->fullsync) {

				/* yep, skip the sync_blocks here, but don't assume

				 * that there will never be anything to do here
@@ -2676,33 +2691,60 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, 
				bio->bi_end_io = end_sync_read;

				bio->bi_rw = READ;

				from_addr = r10_bio->devs[j].addr;

				bio->bi_sector = from_addr +

					conf->mirrors[d].rdev->data_offset;

				bio->bi_bdev = conf->mirrors[d].rdev->bdev;

				atomic_inc(&conf->mirrors[d].rdev->nr_pending);

				atomic_inc(&r10_bio->remaining);

				/* and we write to 'i' */

				bio->bi_sector = from_addr + rdev->data_offset;

				bio->bi_bdev = rdev->bdev;

				atomic_inc(&rdev->nr_pending);

				/* and we write to 'i' (if not in_sync) */



				for (k=0; k<conf->copies; k++)

					if (r10_bio->devs[k].devnum == i)

						break;

				BUG_ON(k == conf->copies);

				to_addr = r10_bio->devs[k].addr;

				r10_bio->devs[0].devnum = d;

				r10_bio->devs[0].addr = from_addr;

				r10_bio->devs[1].devnum = i;

				r10_bio->devs[1].addr = to_addr;



				rdev = mirror->rdev;

				if (!test_bit(In_sync, &rdev->flags)) {

					bio = r10_bio->devs[1].bio;

					bio->bi_next = biolist;

					biolist = bio;

					bio->bi_private = r10_bio;

					bio->bi_end_io = end_sync_write;

					bio->bi_rw = WRITE;

				to_addr = r10_bio->devs[k].addr;

				bio->bi_sector = to_addr +

					conf->mirrors[i].rdev->data_offset;

				bio->bi_bdev = conf->mirrors[i].rdev->bdev;



				r10_bio->devs[0].devnum = d;

				r10_bio->devs[0].addr = from_addr;

				r10_bio->devs[1].devnum = i;

				r10_bio->devs[1].addr = to_addr;

					bio->bi_sector = to_addr

						+ rdev->data_offset;

					bio->bi_bdev = rdev->bdev;

					atomic_inc(&r10_bio->remaining);

				} else

					r10_bio->devs[1].bio->bi_end_io = NULL;



				/* and maybe write to replacement */

				bio = r10_bio->devs[1].repl_bio;

				if (bio)

					bio->bi_end_io = NULL;

				rdev = mirror->replacement;

				/* Note: if rdev != NULL, then bio

				 * cannot be NULL as r10buf_pool_alloc will

				 * have allocated it.

				 * So the second test here is pointless.

				 * But it keeps semantic-checkers happy, and

				 * this comment keeps human reviewers

				 * happy.

				 */

				if (rdev == NULL || bio == NULL ||

				    test_bit(Faulty, &rdev->flags))

					break;

				bio->bi_next = biolist;

				biolist = bio;

				bio->bi_private = r10_bio;

				bio->bi_end_io = end_sync_write;

				bio->bi_rw = WRITE;

				bio->bi_sector = to_addr + rdev->data_offset;

				bio->bi_bdev = rdev->bdev;

				atomic_inc(&r10_bio->remaining);

				break;

			}

			if (j == conf->copies) {
@@ -2720,8 +2762,16 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, 
					for (k = 0; k < conf->copies; k++)

						if (r10_bio->devs[k].devnum == i)

							break;

					if (!rdev_set_badblocks(

						    conf->mirrors[i].rdev,

					if (!test_bit(In_sync,

						      &mirror->rdev->flags)

					    && !rdev_set_badblocks(

						    mirror->rdev,

						    r10_bio->devs[k].addr,

						    max_sync, 0))

						any_working = 0;

					if (mirror->replacement &&

					    !rdev_set_badblocks(

						    mirror->replacement,

						    r10_bio->devs[k].addr,

						    max_sync, 0))

						any_working = 0;
@@ -2732,7 +2782,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, 
						printk(KERN_INFO "md/raid10:%s: insufficient "

						       "working devices for recovery.\n",

						       mdname(mddev));

					conf->mirrors[i].recovery_disabled

					mirror->recovery_disabled

						= mddev->recovery_disabled;

				}

				break;