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Commit 290a1cc4 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://neil.brown.name/md 

* 'for-linus' of git://neil.brown.name/md:
  md: Fix handling for devices from 2TB to 4TB in 0.90 metadata.
  md/raid1,10: Remove use-after-free bug in make_request.
  md/raid10: unify handling of write completion.
  Avoid dereferencing a 'request_queue' after last close.
parents ed2888e9 27a7b260

drivers/md/md.c

+10 −2
Original line number Diff line number Diff line
@@ -1138,8 +1138,11 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version 
			ret = 0;

	}

	rdev->sectors = rdev->sb_start;

	/* Limit to 4TB as metadata cannot record more than that */

	if (rdev->sectors >= (2ULL << 32))

		rdev->sectors = (2ULL << 32) - 2;



	if (rdev->sectors < sb->size * 2 && sb->level > 1)

	if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)

		/* "this cannot possibly happen" ... */

		ret = -EINVAL;
@@ -1173,7 +1176,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) 
		mddev->clevel[0] = 0;

		mddev->layout = sb->layout;

		mddev->raid_disks = sb->raid_disks;

		mddev->dev_sectors = sb->size * 2;

		mddev->dev_sectors = ((sector_t)sb->size) * 2;

		mddev->events = ev1;

		mddev->bitmap_info.offset = 0;

		mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
@@ -1415,6 +1418,11 @@ super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) 
	rdev->sb_start = calc_dev_sboffset(rdev);

	if (!num_sectors || num_sectors > rdev->sb_start)

		num_sectors = rdev->sb_start;

	/* Limit to 4TB as metadata cannot record more than that.

	 * 4TB == 2^32 KB, or 2*2^32 sectors.

	 */

	if (num_sectors >= (2ULL << 32))

		num_sectors = (2ULL << 32) - 2;

	md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,

		       rdev->sb_page);

	md_super_wait(rdev->mddev);

drivers/md/raid1.c

+9 −5
Original line number Diff line number Diff line
@@ -1099,12 +1099,11 @@ static int make_request(mddev_t *mddev, struct bio * bio) 
		bio_list_add(&conf->pending_bio_list, mbio);

		spin_unlock_irqrestore(&conf->device_lock, flags);

	}

	r1_bio_write_done(r1_bio);



	/* In case raid1d snuck in to freeze_array */

	wake_up(&conf->wait_barrier);



	/* Mustn't call r1_bio_write_done before this next test,

	 * as it could result in the bio being freed.

	 */

	if (sectors_handled < (bio->bi_size >> 9)) {

		r1_bio_write_done(r1_bio);

		/* We need another r1_bio.  It has already been counted

		 * in bio->bi_phys_segments

		 */
@@ -1117,6 +1116,11 @@ static int make_request(mddev_t *mddev, struct bio * bio) 
		goto retry_write;

	}



	r1_bio_write_done(r1_bio);



	/* In case raid1d snuck in to freeze_array */

	wake_up(&conf->wait_barrier);



	if (do_sync || !bitmap || !plugged)

		md_wakeup_thread(mddev->thread);

drivers/md/raid10.c

+24 −23
Original line number Diff line number Diff line
@@ -337,6 +337,21 @@ static void close_write(r10bio_t *r10_bio) 
	md_write_end(r10_bio->mddev);

}



static void one_write_done(r10bio_t *r10_bio)

{

	if (atomic_dec_and_test(&r10_bio->remaining)) {

		if (test_bit(R10BIO_WriteError, &r10_bio->state))

			reschedule_retry(r10_bio);

		else {

			close_write(r10_bio);

			if (test_bit(R10BIO_MadeGood, &r10_bio->state))

				reschedule_retry(r10_bio);

			else

				raid_end_bio_io(r10_bio);

		}

	}

}



static void raid10_end_write_request(struct bio *bio, int error)

{

	int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
@@ -387,17 +402,7 @@ static void raid10_end_write_request(struct bio *bio, int error) 
	 * Let's see if all mirrored write operations have finished

	 * already.

	 */

	if (atomic_dec_and_test(&r10_bio->remaining)) {

		if (test_bit(R10BIO_WriteError, &r10_bio->state))

			reschedule_retry(r10_bio);

		else {

			close_write(r10_bio);

			if (test_bit(R10BIO_MadeGood, &r10_bio->state))

				reschedule_retry(r10_bio);

			else

				raid_end_bio_io(r10_bio);

		}

	}

	one_write_done(r10_bio);

	if (dec_rdev)

		rdev_dec_pending(conf->mirrors[dev].rdev, conf->mddev);

}
@@ -1127,20 +1132,12 @@ static int make_request(mddev_t *mddev, struct bio * bio) 
		spin_unlock_irqrestore(&conf->device_lock, flags);

	}



	if (atomic_dec_and_test(&r10_bio->remaining)) {

		/* This matches the end of raid10_end_write_request() */

		bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector,

				r10_bio->sectors,

				!test_bit(R10BIO_Degraded, &r10_bio->state),

				0);

		md_write_end(mddev);

		raid_end_bio_io(r10_bio);

	}



	/* In case raid10d snuck in to freeze_array */

	wake_up(&conf->wait_barrier);

	/* Don't remove the bias on 'remaining' (one_write_done) until

	 * after checking if we need to go around again.

	 */



	if (sectors_handled < (bio->bi_size >> 9)) {

		one_write_done(r10_bio);

		/* We need another r10_bio.  It has already been counted

		 * in bio->bi_phys_segments.

		 */
@@ -1154,6 +1151,10 @@ static int make_request(mddev_t *mddev, struct bio * bio) 
		r10_bio->state = 0;

		goto retry_write;

	}

	one_write_done(r10_bio);



	/* In case raid10d snuck in to freeze_array */

	wake_up(&conf->wait_barrier);



	if (do_sync || !mddev->bitmap || !plugged)

		md_wakeup_thread(mddev->thread);

fs/block_dev.c

+5 −2
Original line number Diff line number Diff line
@@ -1429,6 +1429,11 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) 
		WARN_ON_ONCE(bdev->bd_holders);

		sync_blockdev(bdev);

		kill_bdev(bdev);

		/* ->release can cause the old bdi to disappear,

		 * so must switch it out first

		 */

		bdev_inode_switch_bdi(bdev->bd_inode,

					&default_backing_dev_info);

	}

	if (bdev->bd_contains == bdev) {

		if (disk->fops->release)
@@ -1442,8 +1447,6 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) 
		disk_put_part(bdev->bd_part);

		bdev->bd_part = NULL;

		bdev->bd_disk = NULL;

		bdev_inode_switch_bdi(bdev->bd_inode,

					&default_backing_dev_info);

		if (bdev != bdev->bd_contains)

			victim = bdev->bd_contains;

		bdev->bd_contains = NULL;