Commit 2699b672 authored by NeilBrown's avatar NeilBrown
Browse files

md: load/store badblock list from v1.x metadata 



Space must have been allocated when array was created.
A feature flag is set when the badblock list is non-empty, to
ensure old kernels don't load and trust the whole device.

We only update the on-disk badblocklist when it has changed.
If the badblocklist (or other metadata) is stored on a bad block, we
don't cope very well.

If metadata has no room for bad block, flag bad-blocks as disabled,
and do the same for 0.90 metadata.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 34b343cf

drivers/md/md.c

+102 −6
Original line number Diff line number Diff line
@@ -757,6 +757,10 @@ static void free_disk_sb(mdk_rdev_t * rdev) 
		rdev->sb_start = 0;

		rdev->sectors = 0;

	}

	if (rdev->bb_page) {

		put_page(rdev->bb_page);

		rdev->bb_page = NULL;

	}

}
@@ -1395,6 +1399,8 @@ static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) 
	return cpu_to_le32(csum);

}



static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,

			    int acknowledged);

static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)

{

	struct mdp_superblock_1 *sb;
@@ -1473,6 +1479,47 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) 
	else

		rdev->desc_nr = le32_to_cpu(sb->dev_number);



	if (!rdev->bb_page) {

		rdev->bb_page = alloc_page(GFP_KERNEL);

		if (!rdev->bb_page)

			return -ENOMEM;

	}

	if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&

	    rdev->badblocks.count == 0) {

		/* need to load the bad block list.

		 * Currently we limit it to one page.

		 */

		s32 offset;

		sector_t bb_sector;

		u64 *bbp;

		int i;

		int sectors = le16_to_cpu(sb->bblog_size);

		if (sectors > (PAGE_SIZE / 512))

			return -EINVAL;

		offset = le32_to_cpu(sb->bblog_offset);

		if (offset == 0)

			return -EINVAL;

		bb_sector = (long long)offset;

		if (!sync_page_io(rdev, bb_sector, sectors << 9,

				  rdev->bb_page, READ, true))

			return -EIO;

		bbp = (u64 *)page_address(rdev->bb_page);

		rdev->badblocks.shift = sb->bblog_shift;

		for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {

			u64 bb = le64_to_cpu(*bbp);

			int count = bb & (0x3ff);

			u64 sector = bb >> 10;

			sector <<= sb->bblog_shift;

			count <<= sb->bblog_shift;

			if (bb + 1 == 0)

				break;

			if (md_set_badblocks(&rdev->badblocks,

					     sector, count, 1) == 0)

				return -EINVAL;

		}

	} else if (sb->bblog_offset == 0)

		rdev->badblocks.shift = -1;



	if (!refdev) {

		ret = 1;

	} else {
@@ -1624,7 +1671,6 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) 
	sb->pad0 = 0;

	sb->recovery_offset = cpu_to_le64(0);

	memset(sb->pad1, 0, sizeof(sb->pad1));

	memset(sb->pad2, 0, sizeof(sb->pad2));

	memset(sb->pad3, 0, sizeof(sb->pad3));



	sb->utime = cpu_to_le64((__u64)mddev->utime);
@@ -1664,6 +1710,40 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) 
		sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);

	}



	if (rdev->badblocks.count == 0)

		/* Nothing to do for bad blocks*/ ;

	else if (sb->bblog_offset == 0)

		/* Cannot record bad blocks on this device */

		md_error(mddev, rdev);

	else {

		struct badblocks *bb = &rdev->badblocks;

		u64 *bbp = (u64 *)page_address(rdev->bb_page);

		u64 *p = bb->page;

		sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);

		if (bb->changed) {

			unsigned seq;



retry:

			seq = read_seqbegin(&bb->lock);



			memset(bbp, 0xff, PAGE_SIZE);



			for (i = 0 ; i < bb->count ; i++) {

				u64 internal_bb = *p++;

				u64 store_bb = ((BB_OFFSET(internal_bb) << 10)

						| BB_LEN(internal_bb));

				*bbp++ = cpu_to_le64(store_bb);

			}

			if (read_seqretry(&bb->lock, seq))

				goto retry;



			bb->sector = (rdev->sb_start +

				      (int)le32_to_cpu(sb->bblog_offset));

			bb->size = le16_to_cpu(sb->bblog_size);

			bb->changed = 0;

		}

	}



	max_dev = 0;

	list_for_each_entry(rdev2, &mddev->disks, same_set)

		if (rdev2->desc_nr+1 > max_dev)
@@ -2196,6 +2276,7 @@ static void md_update_sb(mddev_t * mddev, int force_change) 
	mdk_rdev_t *rdev;

	int sync_req;

	int nospares = 0;

	int any_badblocks_changed = 0;



repeat:

	/* First make sure individual recovery_offsets are correct */
@@ -2267,6 +2348,11 @@ repeat: 
		MD_BUG();

		mddev->events --;

	}



	list_for_each_entry(rdev, &mddev->disks, same_set)

		if (rdev->badblocks.changed)

			any_badblocks_changed++;



	sync_sbs(mddev, nospares);

	spin_unlock_irq(&mddev->write_lock);
@@ -2292,6 +2378,13 @@ repeat: 
				bdevname(rdev->bdev,b),

				(unsigned long long)rdev->sb_start);

			rdev->sb_events = mddev->events;

			if (rdev->badblocks.size) {

				md_super_write(mddev, rdev,

					       rdev->badblocks.sector,

					       rdev->badblocks.size << 9,

					       rdev->bb_page);

				rdev->badblocks.size = 0;

			}



		} else

			dprintk(")\n");
@@ -2315,6 +2408,9 @@ repeat: 
	if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))

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



	if (any_badblocks_changed)

		list_for_each_entry(rdev, &mddev->disks, same_set)

			md_ack_all_badblocks(&rdev->badblocks);

}



/* words written to sysfs files may, or may not, be \n terminated.
@@ -2822,6 +2918,8 @@ int md_rdev_init(mdk_rdev_t *rdev) 
	rdev->sb_events = 0;

	rdev->last_read_error.tv_sec  = 0;

	rdev->last_read_error.tv_nsec = 0;

	rdev->sb_loaded = 0;

	rdev->bb_page = NULL;

	atomic_set(&rdev->nr_pending, 0);

	atomic_set(&rdev->read_errors, 0);

	atomic_set(&rdev->corrected_errors, 0);
@@ -2910,11 +3008,9 @@ static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_mi 
	return rdev;



abort_free:

	if (rdev->sb_page) {

	if (rdev->bdev)

		unlock_rdev(rdev);

	free_disk_sb(rdev);

	}

	kfree(rdev->badblocks.page);

	kfree(rdev);

	return ERR_PTR(err);

drivers/md/md.h

+4 −1
Original line number Diff line number Diff line
@@ -55,7 +55,7 @@ struct mdk_rdev_s 
	struct block_device *meta_bdev;

	struct block_device *bdev;	/* block device handle */



	struct page	*sb_page;

	struct page	*sb_page, *bb_page;

	int		sb_loaded;

	__u64		sb_events;

	sector_t	data_offset;	/* start of data in array */
@@ -127,6 +127,9 @@ struct mdk_rdev_s 
		u64	*page;		/* badblock list */

		int	changed;

		seqlock_t lock;



		sector_t sector;

		sector_t size;		/* in sectors */

	} badblocks;

};

include/linux/raid/md_p.h

+10 −4
Original line number Diff line number Diff line
@@ -245,10 +245,16 @@ struct mdp_superblock_1 { 
	__u8	device_uuid[16]; /* user-space setable, ignored by kernel */

	__u8	devflags;	/* per-device flags.  Only one defined...*/

#define	WriteMostly1	1	/* mask for writemostly flag in above */

	__u8	pad2[64-57];	/* set to 0 when writing */

	/* Bad block log.  If there are any bad blocks the feature flag is set.

	 * If offset and size are non-zero, that space is reserved and available

	 */

	__u8	bblog_shift;	/* shift from sectors to block size */

	__le16	bblog_size;	/* number of sectors reserved for list */

	__le32	bblog_offset;	/* sector offset from superblock to bblog,

				 * signed - not unsigned */



	/* array state information - 64 bytes */

	__le64	utime;		/* 40 bits second, 24 btes microseconds */

	__le64	utime;		/* 40 bits second, 24 bits microseconds */

	__le64	events;		/* incremented when superblock updated */

	__le64	resync_offset;	/* data before this offset (from data_offset) known to be in sync */

	__le32	sb_csum;	/* checksum up to devs[max_dev] */
@@ -270,8 +276,8 @@ struct mdp_superblock_1 { 
					   * must be honoured

					   */

#define	MD_FEATURE_RESHAPE_ACTIVE	4

#define	MD_FEATURE_BAD_BLOCKS		8 /* badblock list is not empty */



#define	MD_FEATURE_ALL			(1|2|4)

#define	MD_FEATURE_ALL			(1|2|4|8)



#endif

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