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Commit 62096bce authored by NeilBrown's avatar NeilBrown
Browse files

md/raid1: factor several functions out or raid1d() 



raid1d is too big with several deep branches.
So separate them out into their own functions.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
Reviewed-by: default avatarNamhyung Kim <namhyung@gmail.com>
parent 3a9f28a5

drivers/md/raid1.c

+151 −159
Original line number Diff line number Diff line
@@ -1861,105 +1861,66 @@ static int narrow_write_error(r1bio_t *r1_bio, int i) 
	return ok;

}



static void raid1d(mddev_t *mddev)

static void handle_sync_write_finished(conf_t *conf, r1bio_t *r1_bio)

{

	r1bio_t *r1_bio;

	struct bio *bio;

	unsigned long flags;

	conf_t *conf = mddev->private;

	struct list_head *head = &conf->retry_list;

	mdk_rdev_t *rdev;

	struct blk_plug plug;



	md_check_recovery(mddev);



	blk_start_plug(&plug);

	for (;;) {

		char b[BDEVNAME_SIZE];



		if (atomic_read(&mddev->plug_cnt) == 0)

			flush_pending_writes(conf);



		spin_lock_irqsave(&conf->device_lock, flags);

		if (list_empty(head)) {

			spin_unlock_irqrestore(&conf->device_lock, flags);

			break;

		}

		r1_bio = list_entry(head->prev, r1bio_t, retry_list);

		list_del(head->prev);

		conf->nr_queued--;

		spin_unlock_irqrestore(&conf->device_lock, flags);



		mddev = r1_bio->mddev;

		conf = mddev->private;

		if (test_bit(R1BIO_IsSync, &r1_bio->state)) {

			if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||

			    test_bit(R1BIO_WriteError, &r1_bio->state)) {

	int m;

	int s = r1_bio->sectors;

	for (m = 0; m < conf->raid_disks ; m++) {

					mdk_rdev_t *rdev

						= conf->mirrors[m].rdev;

		mdk_rdev_t *rdev = conf->mirrors[m].rdev;

		struct bio *bio = r1_bio->bios[m];

		if (bio->bi_end_io == NULL)

			continue;

					if (test_bit(BIO_UPTODATE,

						     &bio->bi_flags) &&

					    test_bit(R1BIO_MadeGood,

						     &r1_bio->state)) {

						rdev_clear_badblocks(

							rdev,

							r1_bio->sector,

							r1_bio->sectors);

		if (test_bit(BIO_UPTODATE, &bio->bi_flags) &&

		    test_bit(R1BIO_MadeGood, &r1_bio->state)) {

			rdev_clear_badblocks(rdev, r1_bio->sector, s);

		}

					if (!test_bit(BIO_UPTODATE,

						      &bio->bi_flags) &&

					    test_bit(R1BIO_WriteError,

						     &r1_bio->state)) {

						if (!rdev_set_badblocks(

							    rdev,

							    r1_bio->sector,

							    r1_bio->sectors, 0))

							md_error(mddev, rdev);

		if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&

		    test_bit(R1BIO_WriteError, &r1_bio->state)) {

			if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0))

				md_error(conf->mddev, rdev);

		}

	}

	put_buf(r1_bio);

				md_done_sync(mddev, s, 1);

			} else

				sync_request_write(mddev, r1_bio);

		} else if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||

			   test_bit(R1BIO_WriteError, &r1_bio->state)) {

	md_done_sync(conf->mddev, s, 1);

}



static void handle_write_finished(conf_t *conf, r1bio_t *r1_bio)

{

	int m;

	for (m = 0; m < conf->raid_disks ; m++)

		if (r1_bio->bios[m] == IO_MADE_GOOD) {

					rdev = conf->mirrors[m].rdev;

					rdev_clear_badblocks(

						rdev,

			mdk_rdev_t *rdev = conf->mirrors[m].rdev;

			rdev_clear_badblocks(rdev,

					     r1_bio->sector,

					     r1_bio->sectors);

					rdev_dec_pending(rdev, mddev);

			rdev_dec_pending(rdev, conf->mddev);

		} else if (r1_bio->bios[m] != NULL) {

					/* This drive got a write error.  We

					 * need to narrow down and record

					 * precise write errors.

			/* This drive got a write error.  We need to

			 * narrow down and record precise write

			 * errors.

			 */

			if (!narrow_write_error(r1_bio, m)) {

						md_error(mddev,

				md_error(conf->mddev,

					 conf->mirrors[m].rdev);

						/* an I/O failed, we can't clear

						 * the bitmap */

						set_bit(R1BIO_Degraded,

							&r1_bio->state);

				/* an I/O failed, we can't clear the bitmap */

				set_bit(R1BIO_Degraded, &r1_bio->state);

			}

			rdev_dec_pending(conf->mirrors[m].rdev,

							 mddev);

					 conf->mddev);

		}

	if (test_bit(R1BIO_WriteError, &r1_bio->state))

		close_write(r1_bio);

	raid_end_bio_io(r1_bio);

		} else if (test_bit(R1BIO_ReadError, &r1_bio->state)) {

}



static void handle_read_error(conf_t *conf, r1bio_t *r1_bio)

{

	int disk;

	int max_sectors;

	mddev_t *mddev = conf->mddev;

	struct bio *bio;

	char b[BDEVNAME_SIZE];

	mdk_rdev_t *rdev;



	clear_bit(R1BIO_ReadError, &r1_bio->state);

	/* we got a read error. Maybe the drive is bad.  Maybe just
@@ -1973,12 +1934,10 @@ static void raid1d(mddev_t *mddev) 
	if (mddev->ro == 0) {

		freeze_array(conf);

		fix_read_error(conf, r1_bio->read_disk,

					       r1_bio->sector,

					       r1_bio->sectors);

			       r1_bio->sector, r1_bio->sectors);

		unfreeze_array(conf);

	} else

				md_error(mddev,

					 conf->mirrors[r1_bio->read_disk].rdev);

		md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev);



	bio = r1_bio->bios[r1_bio->read_disk];

	bdevname(bio->bi_bdev, b);
@@ -1987,26 +1946,22 @@ read_more: 
	if (disk == -1) {

		printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O"

		       " read error for block %llu\n",

				       mdname(mddev), b,

				       (unsigned long long)r1_bio->sector);

		       mdname(mddev), b, (unsigned long long)r1_bio->sector);

		raid_end_bio_io(r1_bio);

	} else {

				const unsigned long do_sync = r1_bio->master_bio->bi_rw & REQ_SYNC;

		const unsigned long do_sync

			= r1_bio->master_bio->bi_rw & REQ_SYNC;

		if (bio) {

			r1_bio->bios[r1_bio->read_disk] =

				mddev->ro ? IO_BLOCKED : NULL;

			bio_put(bio);

		}

		r1_bio->read_disk = disk;

				bio = bio_clone_mddev(r1_bio->master_bio,

						      GFP_NOIO, mddev);

				md_trim_bio(bio,

					    r1_bio->sector - bio->bi_sector,

					    max_sectors);

		bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev);

		md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors);

		r1_bio->bios[r1_bio->read_disk] = bio;

		rdev = conf->mirrors[disk].rdev;

				printk_ratelimited(

					KERN_ERR

		printk_ratelimited(KERN_ERR

				   "md/raid1:%s: redirecting sector %llu"

				   " to other mirror: %s\n",

				   mdname(mddev),
@@ -2020,9 +1975,8 @@ read_more: 
		if (max_sectors < r1_bio->sectors) {

			/* Drat - have to split this up more */

			struct bio *mbio = r1_bio->master_bio;

					int sectors_handled =

						r1_bio->sector + max_sectors

						- mbio->bi_sector;

			int sectors_handled = (r1_bio->sector + max_sectors

					       - mbio->bi_sector);

			r1_bio->sectors = max_sectors;

			spin_lock_irq(&conf->device_lock);

			if (mbio->bi_phys_segments == 0)
@@ -2033,29 +1987,67 @@ read_more: 
			generic_make_request(bio);

			bio = NULL;



					r1_bio = mempool_alloc(conf->r1bio_pool,

							       GFP_NOIO);

			r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO);



			r1_bio->master_bio = mbio;

			r1_bio->sectors = (mbio->bi_size >> 9)

					  - sectors_handled;

			r1_bio->state = 0;

					set_bit(R1BIO_ReadError,

						&r1_bio->state);

			set_bit(R1BIO_ReadError, &r1_bio->state);

			r1_bio->mddev = mddev;

					r1_bio->sector = mbio->bi_sector

						+ sectors_handled;

			r1_bio->sector = mbio->bi_sector + sectors_handled;



			goto read_more;

		} else

			generic_make_request(bio);

	}

		} else {

}



static void raid1d(mddev_t *mddev)

{

	r1bio_t *r1_bio;

	unsigned long flags;

	conf_t *conf = mddev->private;

	struct list_head *head = &conf->retry_list;

	struct blk_plug plug;



	md_check_recovery(mddev);



	blk_start_plug(&plug);

	for (;;) {



		if (atomic_read(&mddev->plug_cnt) == 0)

			flush_pending_writes(conf);



		spin_lock_irqsave(&conf->device_lock, flags);

		if (list_empty(head)) {

			spin_unlock_irqrestore(&conf->device_lock, flags);

			break;

		}

		r1_bio = list_entry(head->prev, r1bio_t, retry_list);

		list_del(head->prev);

		conf->nr_queued--;

		spin_unlock_irqrestore(&conf->device_lock, flags);



		mddev = r1_bio->mddev;

		conf = mddev->private;

		if (test_bit(R1BIO_IsSync, &r1_bio->state)) {

			if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||

			    test_bit(R1BIO_WriteError, &r1_bio->state))

				handle_sync_write_finished(conf, r1_bio);

			else

				sync_request_write(mddev, r1_bio);

		} else if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||

			   test_bit(R1BIO_WriteError, &r1_bio->state))

			handle_write_finished(conf, r1_bio);

		else if (test_bit(R1BIO_ReadError, &r1_bio->state))

			handle_read_error(conf, r1_bio);

		else

			/* just a partial read to be scheduled from separate

			 * context

			 */

			generic_make_request(r1_bio->bios[r1_bio->read_disk]);

		}



		cond_resched();

		if (mddev->flags & ~(1<<MD_CHANGE_PENDING))

			md_check_recovery(mddev);