[dm-devel] [PATCH 15/15] dm-zoned: metadata version 2
Damien Le Moal
Damien.LeMoal at wdc.com
Mon May 11 08:36:25 UTC 2020
On 2020/05/11 17:24, Hannes Reinecke wrote:
> Implement handling for metadata version 2. The new metadata adds
> a label and UUID for the device mapper device, and additional UUID
> for the underlying block devices.
> It also allows for an additional regular drive to be used for
> emulating random access zones. The emulated zones will be placed
> logically in front of the zones from the zoned block device, causing
> the superblocks and metadata to be stored on that device.
> The first zone of the original zoned device will be used to hold
> another, tertiary copy of the metadata; this copy carries a
> generation number of 0 and is never updated; it's just used
> for identification.
>
> Signed-off-by: Hannes Reinecke <hare at suse.de>
> Reviewed-by: Bob Liu <bob.liu at oracle.com>
> Reviewed-by: Damien Le Moal <damien.lemoal at wdc.com>
Forgot to read through the documentation update. A couple of comments added below.
> ---
> .../admin-guide/device-mapper/dm-zoned.rst | 34 ++-
> drivers/md/dm-zoned-metadata.c | 310 +++++++++++++++++----
> drivers/md/dm-zoned-target.c | 185 ++++++++----
> drivers/md/dm-zoned.h | 7 +-
> 4 files changed, 427 insertions(+), 109 deletions(-)
>
> diff --git a/Documentation/admin-guide/device-mapper/dm-zoned.rst b/Documentation/admin-guide/device-mapper/dm-zoned.rst
> index 7547ce635161..553752ea2521 100644
> --- a/Documentation/admin-guide/device-mapper/dm-zoned.rst
> +++ b/Documentation/admin-guide/device-mapper/dm-zoned.rst
> @@ -37,9 +37,13 @@ Algorithm
> dm-zoned implements an on-disk buffering scheme to handle non-sequential
> write accesses to the sequential zones of a zoned block device.
> Conventional zones are used for caching as well as for storing internal
> -metadata.
> +metadata. It can also use a regular block device together with the zoned
> +block device; in that case the regular block device will be split logically
> +in zones with the same size as the zoned block device. These zones will be
> +placed in front of the zones from the zoned block device and will be handled
> +just like conventional zones.
>
> -The zones of the device are separated into 2 types:
> +The zones of the device(s) are separated into 2 types:
>
> 1) Metadata zones: these are conventional zones used to store metadata.
> Metadata zones are not reported as useable capacity to the user.
> @@ -127,6 +131,13 @@ resumed. Flushing metadata thus only temporarily delays write and
> discard requests. Read requests can be processed concurrently while
> metadata flush is being executed.
>
> +If a regular device is used in conjunction with the zoned block device,
> +a third set of metadata (without the zone bitmaps) is written to the
> +start of the zoned block device. This metadata has a generation counter of
> +'0' and will never be updated during normal operation; it just serves for
> +identification purposes. The first and second copy of the metadata
> +are located at the start of the regular block device.
> +
> Usage
> =====
>
> @@ -138,12 +149,21 @@ Ex::
>
> dmzadm --format /dev/sdxx
>
> -For a formatted device, the target can be created normally with the
> -dmsetup utility. The only parameter that dm-zoned requires is the
> -underlying zoned block device name. Ex::
>
> - echo "0 `blockdev --getsize ${dev}` zoned ${dev}" | \
> - dmsetup create dmz-`basename ${dev}`
> +If two drives are to be used, both devices must be specified, with the
> +regular block device as the first device.
Actually, the zoned block device must be first. Otherwise dmzadm complains. We
can change that, or change the doc. Which do you prefer ? No strong opinion here.
> +
> +Ex::
> +
> + dmzadm --format /dev/sdxx /dev/sdyy
> +
> +
> +Fomatted device(s) can be started with the dmzadm utility, too.:
> +
> +Ex::
> +
> + dmzadm --start /dev/sdxx /dev/sdyy
And same here, the zoned device must come first. I added a patch that internally
reverse that order for the dm start operation so that the regular device is
specified first.
> +
>
> Information about the internal layout and current usage of the zones can
> be obtained with the 'status' callback from dmsetup:
> diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
> index 067ce010f457..d9e256762eff 100644
> --- a/drivers/md/dm-zoned-metadata.c
> +++ b/drivers/md/dm-zoned-metadata.c
> @@ -16,7 +16,7 @@
> /*
> * Metadata version.
> */
> -#define DMZ_META_VER 1
> +#define DMZ_META_VER 2
>
> /*
> * On-disk super block magic.
> @@ -69,8 +69,17 @@ struct dmz_super {
> /* Checksum */
> __le32 crc; /* 48 */
>
> + /* DM-Zoned label */
> + u8 dmz_label[32]; /* 80 */
> +
> + /* DM-Zoned UUID */
> + u8 dmz_uuid[16]; /* 96 */
> +
> + /* Device UUID */
> + u8 dev_uuid[16]; /* 112 */
> +
> /* Padding to full 512B sector */
> - u8 reserved[464]; /* 512 */
> + u8 reserved[400]; /* 512 */
> };
>
> /*
> @@ -133,8 +142,11 @@ struct dmz_sb {
> */
> struct dmz_metadata {
> struct dmz_dev *dev;
> + unsigned int nr_devs;
>
> char devname[BDEVNAME_SIZE];
> + char label[BDEVNAME_SIZE];
> + uuid_t uuid;
>
> sector_t zone_bitmap_size;
> unsigned int zone_nr_bitmap_blocks;
> @@ -161,8 +173,9 @@ struct dmz_metadata {
> /* Zone information array */
> struct dm_zone *zones;
>
> - struct dmz_sb sb[2];
> + struct dmz_sb sb[3];
> unsigned int mblk_primary;
> + unsigned int sb_version;
> u64 sb_gen;
> unsigned int min_nr_mblks;
> unsigned int max_nr_mblks;
> @@ -195,31 +208,56 @@ struct dmz_metadata {
> };
>
> #define dmz_zmd_info(zmd, format, args...) \
> - DMINFO("(%s): " format, (zmd)->devname, ## args)
> + DMINFO("(%s): " format, (zmd)->label, ## args)
>
> #define dmz_zmd_err(zmd, format, args...) \
> - DMERR("(%s): " format, (zmd)->devname, ## args)
> + DMERR("(%s): " format, (zmd)->label, ## args)
>
> #define dmz_zmd_warn(zmd, format, args...) \
> - DMWARN("(%s): " format, (zmd)->devname, ## args)
> + DMWARN("(%s): " format, (zmd)->label, ## args)
>
> #define dmz_zmd_debug(zmd, format, args...) \
> - DMDEBUG("(%s): " format, (zmd)->devname, ## args)
> + DMDEBUG("(%s): " format, (zmd)->label, ## args)
> /*
> * Various accessors
> */
> +unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone)
> +{
> + unsigned int zone_id;
> +
> + if (WARN_ON(!zone))
> + return 0;
> +
> + zone_id = zone->id;
> + if (zmd->nr_devs > 1 &&
> + (zone_id >= zmd->dev[1].zone_offset))
> + zone_id -= zmd->dev[1].zone_offset;
> + return zone_id;
> +}
> +
> sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone)
> {
> - return (sector_t)zone->id << zmd->zone_nr_sectors_shift;
> + unsigned int zone_id = dmz_dev_zone_id(zmd, zone);
> +
> + return (sector_t)zone_id << zmd->zone_nr_sectors_shift;
> }
>
> sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone)
> {
> - return (sector_t)zone->id << zmd->zone_nr_blocks_shift;
> + unsigned int zone_id = dmz_dev_zone_id(zmd, zone);
> +
> + return (sector_t)zone_id << zmd->zone_nr_blocks_shift;
> }
>
> struct dmz_dev *dmz_zone_to_dev(struct dmz_metadata *zmd, struct dm_zone *zone)
> {
> + if (WARN_ON(!zone))
> + return &zmd->dev[0];
> +
> + if (zmd->nr_devs > 1 &&
> + zone->id >= zmd->dev[1].zone_offset)
> + return &zmd->dev[1];
> +
> return &zmd->dev[0];
> }
>
> @@ -275,17 +313,29 @@ unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd)
>
> const char *dmz_metadata_label(struct dmz_metadata *zmd)
> {
> - return (const char *)zmd->devname;
> + return (const char *)zmd->label;
> }
>
> bool dmz_check_dev(struct dmz_metadata *zmd)
> {
> - return dmz_check_bdev(&zmd->dev[0]);
> + unsigned int i;
> +
> + for (i = 0; i < zmd->nr_devs; i++) {
> + if (!dmz_check_bdev(&zmd->dev[i]))
> + return false;
> + }
> + return true;
> }
>
> bool dmz_dev_is_dying(struct dmz_metadata *zmd)
> {
> - return dmz_bdev_is_dying(&zmd->dev[0]);
> + unsigned int i;
> +
> + for (i = 0; i < zmd->nr_devs; i++) {
> + if (dmz_bdev_is_dying(&zmd->dev[i]))
> + return true;
> + }
> + return false;
> }
>
> /*
> @@ -687,6 +737,9 @@ static int dmz_rdwr_block(struct dmz_dev *dev, int op,
> struct bio *bio;
> int ret;
>
> + if (WARN_ON(!dev))
> + return -EIO;
> +
> if (dmz_bdev_is_dying(dev))
> return -EIO;
>
> @@ -711,19 +764,32 @@ static int dmz_rdwr_block(struct dmz_dev *dev, int op,
> */
> static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set)
> {
> - sector_t block = zmd->sb[set].block;
> struct dmz_mblock *mblk = zmd->sb[set].mblk;
> struct dmz_super *sb = zmd->sb[set].sb;
> struct dmz_dev *dev = zmd->sb[set].dev;
> + sector_t sb_block;
> u64 sb_gen = zmd->sb_gen + 1;
> int ret;
>
> sb->magic = cpu_to_le32(DMZ_MAGIC);
> - sb->version = cpu_to_le32(DMZ_META_VER);
> +
> + sb->version = cpu_to_le32(zmd->sb_version);
> + if (zmd->sb_version > 1) {
> + BUILD_BUG_ON(UUID_SIZE != 16);
> + export_uuid(sb->dmz_uuid, &zmd->uuid);
> + memcpy(sb->dmz_label, zmd->label, BDEVNAME_SIZE);
> + export_uuid(sb->dev_uuid, &dev->uuid);
> + }
>
> sb->gen = cpu_to_le64(sb_gen);
>
> - sb->sb_block = cpu_to_le64(block);
> + /*
> + * The metadata always references the absolute block address,
> + * ie relative to the entire block range, not the per-device
> + * block address.
> + */
> + sb_block = zmd->sb[set].zone->id << zmd->zone_nr_blocks_shift;
> + sb->sb_block = cpu_to_le64(sb_block);
> sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks);
> sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq);
> sb->nr_chunks = cpu_to_le32(zmd->nr_chunks);
> @@ -734,7 +800,8 @@ static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set)
> sb->crc = 0;
> sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE));
>
> - ret = dmz_rdwr_block(dev, REQ_OP_WRITE, block, mblk->page);
> + ret = dmz_rdwr_block(dev, REQ_OP_WRITE, zmd->sb[set].block,
> + mblk->page);
> if (ret == 0)
> ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL);
>
> @@ -915,6 +982,23 @@ static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
> u32 crc, stored_crc;
> u64 gen;
>
> + if (le32_to_cpu(sb->magic) != DMZ_MAGIC) {
> + dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)",
> + DMZ_MAGIC, le32_to_cpu(sb->magic));
> + return -ENXIO;
> + }
> +
> + zmd->sb_version = le32_to_cpu(sb->version);
> + if (zmd->sb_version > DMZ_META_VER) {
> + dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)",
> + DMZ_META_VER, zmd->sb_version);
> + return -EINVAL;
> + }
> + if ((zmd->sb_version < 1) && (set == 2)) {
> + dmz_dev_err(dev, "Tertiary superblocks are not supported");
> + return -EINVAL;
> + }
> +
> gen = le64_to_cpu(sb->gen);
> stored_crc = le32_to_cpu(sb->crc);
> sb->crc = 0;
> @@ -925,16 +1009,45 @@ static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
> return -ENXIO;
> }
>
> - if (le32_to_cpu(sb->magic) != DMZ_MAGIC) {
> - dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)",
> - DMZ_MAGIC, le32_to_cpu(sb->magic));
> - return -ENXIO;
> - }
> + if (zmd->sb_version > 1) {
> + uuid_t sb_uuid;
> +
> + import_uuid(&sb_uuid, sb->dmz_uuid);
> + if (uuid_is_null(&sb_uuid)) {
> + dmz_dev_err(dev, "NULL DM-Zoned uuid");
> + return -ENXIO;
> + } else if (uuid_is_null(&zmd->uuid)) {
> + uuid_copy(&zmd->uuid, &sb_uuid);
> + } else if (!uuid_equal(&zmd->uuid, &sb_uuid)) {
> + dmz_dev_err(dev, "mismatching DM-Zoned uuid, "
> + "is %pUl expected %pUl",
> + &sb_uuid, &zmd->uuid);
> + return -ENXIO;
> + }
> + if (!strlen(zmd->label))
> + memcpy(zmd->label, sb->dmz_label, BDEVNAME_SIZE);
> + else if (memcmp(zmd->label, sb->dmz_label, BDEVNAME_SIZE)) {
> + dmz_dev_err(dev, "mismatching DM-Zoned label, "
> + "is %s expected %s",
> + sb->dmz_label, zmd->label);
> + return -ENXIO;
> + }
> + import_uuid(&dev->uuid, sb->dev_uuid);
> + if (uuid_is_null(&dev->uuid)) {
> + dmz_dev_err(dev, "NULL device uuid");
> + return -ENXIO;
> + }
>
> - if (le32_to_cpu(sb->version) != DMZ_META_VER) {
> - dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)",
> - DMZ_META_VER, le32_to_cpu(sb->version));
> - return -ENXIO;
> + if (set == 2) {
> + /*
> + * Generation number should be 0, but it doesn't
> + * really matter if it isn't.
> + */
> + if (gen != 0)
> + dmz_dev_warn(dev, "Invalid generation %llu",
> + gen);
> + return 0;
> + }
> }
>
> nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + zmd->zone_nr_blocks - 1)
> @@ -1185,21 +1298,38 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
> "Using super block %u (gen %llu)",
> zmd->mblk_primary, zmd->sb_gen);
>
> + if ((zmd->sb_version > 1) && zmd->sb[2].zone) {
> + zmd->sb[2].block = dmz_start_block(zmd, zmd->sb[2].zone);
> + zmd->sb[2].dev = dmz_zone_to_dev(zmd, zmd->sb[2].zone);
> + ret = dmz_get_sb(zmd, 2);
> + if (ret) {
> + dmz_dev_err(zmd->sb[2].dev,
> + "Read tertiary super block failed");
> + return ret;
> + }
> + ret = dmz_check_sb(zmd, 2);
> + if (ret == -EINVAL)
> + return ret;
> + }
> return 0;
> }
>
> /*
> * Initialize a zone descriptor.
> */
> -static int dmz_init_zone(struct blk_zone *blkz, unsigned int idx, void *data)
> +static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
> {
> struct dmz_metadata *zmd = data;
> + struct dmz_dev *dev = zmd->nr_devs > 1 ? &zmd->dev[1] : &zmd->dev[0];
> + int idx = num + dev->zone_offset;
> struct dm_zone *zone = &zmd->zones[idx];
> - struct dmz_dev *dev = zmd->dev;
>
> - /* Ignore the eventual last runt (smaller) zone */
> if (blkz->len != zmd->zone_nr_sectors) {
> - if (blkz->start + blkz->len == dev->capacity)
> + if (zmd->sb_version > 1) {
> + /* Ignore the eventual runt (smaller) zone */
> + set_bit(DMZ_OFFLINE, &zone->flags);
> + return 0;
> + } else if (blkz->start + blkz->len == dev->capacity)
> return 0;
> return -ENXIO;
> }
> @@ -1234,16 +1364,45 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int idx, void *data)
> zmd->nr_useable_zones++;
> if (dmz_is_rnd(zone)) {
> zmd->nr_rnd_zones++;
> - if (!zmd->sb[0].zone) {
> - /* Super block zone */
> + if (zmd->nr_devs == 1 && !zmd->sb[0].zone) {
> + /* Primary super block zone */
> zmd->sb[0].zone = zone;
> }
> }
> + if (zmd->nr_devs > 1 && !zmd->sb[2].zone) {
> + /* Tertiary superblock zone */
> + zmd->sb[2].zone = zone;
> + }
> }
>
> return 0;
> }
>
> +static void dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev)
> +{
> + int idx;
> + sector_t zone_offset = 0;
> +
> + for(idx = 0; idx < dev->nr_zones; idx++) {
> + struct dm_zone *zone = &zmd->zones[idx];
> +
> + INIT_LIST_HEAD(&zone->link);
> + atomic_set(&zone->refcount, 0);
> + zone->id = idx;
> + zone->chunk = DMZ_MAP_UNMAPPED;
> + set_bit(DMZ_RND, &zone->flags);
> + zone->wp_block = 0;
> + zmd->nr_rnd_zones++;
> + zmd->nr_useable_zones++;
> + if (dev->capacity - zone_offset < zmd->zone_nr_sectors) {
> + /* Disable runt zone */
> + set_bit(DMZ_OFFLINE, &zone->flags);
> + break;
> + }
> + zone_offset += zmd->zone_nr_sectors;
> + }
> +}
> +
> /*
> * Free zones descriptors.
> */
> @@ -1259,11 +1418,11 @@ static void dmz_drop_zones(struct dmz_metadata *zmd)
> */
> static int dmz_init_zones(struct dmz_metadata *zmd)
> {
> - struct dmz_dev *dev = &zmd->dev[0];
> - int ret;
> + int i, ret;
> + struct dmz_dev *zoned_dev = &zmd->dev[0];
>
> /* Init */
> - zmd->zone_nr_sectors = dev->zone_nr_sectors;
> + zmd->zone_nr_sectors = zmd->dev[0].zone_nr_sectors;
> zmd->zone_nr_sectors_shift = ilog2(zmd->zone_nr_sectors);
> zmd->zone_nr_blocks = dmz_sect2blk(zmd->zone_nr_sectors);
> zmd->zone_nr_blocks_shift = ilog2(zmd->zone_nr_blocks);
> @@ -1274,7 +1433,14 @@ static int dmz_init_zones(struct dmz_metadata *zmd)
> DMZ_BLOCK_SIZE_BITS);
>
> /* Allocate zone array */
> - zmd->nr_zones = dev->nr_zones;
> + zmd->nr_zones = 0;
> + for (i = 0; i < zmd->nr_devs; i++)
> + zmd->nr_zones += zmd->dev[i].nr_zones;
> +
> + if (!zmd->nr_zones) {
> + DMERR("(%s): No zones found", zmd->devname);
> + return -ENXIO;
> + }
> zmd->zones = kcalloc(zmd->nr_zones, sizeof(struct dm_zone), GFP_KERNEL);
> if (!zmd->zones)
> return -ENOMEM;
> @@ -1282,14 +1448,27 @@ static int dmz_init_zones(struct dmz_metadata *zmd)
> DMDEBUG("(%s): Using %zu B for zone information",
> zmd->devname, sizeof(struct dm_zone) * zmd->nr_zones);
>
> + if (zmd->nr_devs > 1) {
> + dmz_emulate_zones(zmd, &zmd->dev[0]);
> + /*
> + * Primary superblock zone is always at zone 0 when multiple
> + * drives are present.
> + */
> + zmd->sb[0].zone = &zmd->zones[0];
> +
> + zoned_dev = &zmd->dev[1];
> + }
> +
> /*
> * Get zone information and initialize zone descriptors. At the same
> * time, determine where the super block should be: first block of the
> * first randomly writable zone.
> */
> - ret = blkdev_report_zones(dev->bdev, 0, BLK_ALL_ZONES, dmz_init_zone,
> - zmd);
> + ret = blkdev_report_zones(zoned_dev->bdev, 0, BLK_ALL_ZONES,
> + dmz_init_zone, zmd);
> if (ret < 0) {
> + DMDEBUG("(%s): Failed to report zones, error %d",
> + zmd->devname, ret);
> dmz_drop_zones(zmd);
> return ret;
> }
> @@ -1325,6 +1504,9 @@ static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
> unsigned int noio_flag;
> int ret;
>
> + if (dev->flags & DMZ_BDEV_REGULAR)
> + return 0;
> +
> /*
> * Get zone information from disk. Since blkdev_report_zones() uses
> * GFP_KERNEL by default for memory allocations, set the per-task
> @@ -2475,18 +2657,33 @@ void dmz_print_dev(struct dmz_metadata *zmd, int num)
> {
> struct dmz_dev *dev = &zmd->dev[num];
>
> - dmz_dev_info(dev, "Host-%s zoned block device",
> - bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ?
> - "aware" : "managed");
> - dmz_dev_info(dev, " %llu 512-byte logical sectors",
> - (u64)dev->capacity);
> - dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors",
> - dev->nr_zones, (u64)zmd->zone_nr_sectors);
> + if (bdev_zoned_model(dev->bdev) == BLK_ZONED_NONE)
> + dmz_dev_info(dev, "Regular block device");
> + else
> + dmz_dev_info(dev, "Host-%s zoned block device",
> + bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ?
> + "aware" : "managed");
> + if (zmd->sb_version > 1) {
> + sector_t sector_offset =
> + dev->zone_offset << zmd->zone_nr_sectors_shift;
> +
> + dmz_dev_info(dev, " %llu 512-byte logical sectors (offset %llu)",
> + (u64)dev->capacity, (u64)sector_offset);
> + dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors (offset %llu)",
> + dev->nr_zones, (u64)zmd->zone_nr_sectors,
> + (u64)dev->zone_offset);
> + } else {
> + dmz_dev_info(dev, " %llu 512-byte logical sectors",
> + (u64)dev->capacity);
> + dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors",
> + dev->nr_zones, (u64)zmd->zone_nr_sectors);
> + }
> }
> /*
> * Initialize the zoned metadata.
> */
> -int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **metadata,
> +int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
> + struct dmz_metadata **metadata,
> const char *devname)
> {
> struct dmz_metadata *zmd;
> @@ -2500,6 +2697,7 @@ int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **metadata,
>
> strcpy(zmd->devname, devname);
> zmd->dev = dev;
> + zmd->nr_devs = num_dev;
> zmd->mblk_rbtree = RB_ROOT;
> init_rwsem(&zmd->mblk_sem);
> mutex_init(&zmd->mblk_flush_lock);
> @@ -2534,11 +2732,24 @@ int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **metadata,
> /* Set metadata zones starting from sb_zone */
> for (i = 0; i < zmd->nr_meta_zones << 1; i++) {
> zone = dmz_get(zmd, zmd->sb[0].zone->id + i);
> - if (!dmz_is_rnd(zone))
> + if (!dmz_is_rnd(zone)) {
> + dmz_zmd_err(zmd,
> + "metadata zone %d is not random", i);
> + ret = -ENXIO;
> goto err;
> + }
> + set_bit(DMZ_META, &zone->flags);
> + }
> + if (zmd->sb[2].zone) {
> + zone = dmz_get(zmd, zmd->sb[2].zone->id);
> + if (!zone) {
> + dmz_zmd_err(zmd,
> + "Tertiary metadata zone not present");
> + ret = -ENXIO;
> + goto err;
> + }
> set_bit(DMZ_META, &zone->flags);
> }
> -
> /* Load mapping table */
> ret = dmz_load_mapping(zmd);
> if (ret)
> @@ -2563,8 +2774,9 @@ int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **metadata,
> goto err;
> }
>
> - dmz_zmd_info(zmd, "DM-Zoned metadata version %d", DMZ_META_VER);
> - dmz_print_dev(zmd, 0);
> + dmz_zmd_info(zmd, "DM-Zoned metadata version %d", zmd->sb_version);
> + for (i = 0; i < zmd->nr_devs; i++)
> + dmz_print_dev(zmd, i);
>
> dmz_zmd_info(zmd, " %u zones of %llu 512-byte logical sectors",
> zmd->nr_zones, (u64)zmd->zone_nr_sectors);
> diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
> index a09fb78ffe88..ea43f6892ced 100644
> --- a/drivers/md/dm-zoned-target.c
> +++ b/drivers/md/dm-zoned-target.c
> @@ -13,6 +13,8 @@
>
> #define DMZ_MIN_BIOS 8192
>
> +#define DMZ_MAX_DEVS 2
> +
> /*
> * Zone BIO context.
> */
> @@ -38,7 +40,7 @@ struct dm_chunk_work {
> * Target descriptor.
> */
> struct dmz_target {
> - struct dm_dev *ddev;
> + struct dm_dev *ddev[DMZ_MAX_DEVS];
>
> unsigned long flags;
>
> @@ -81,7 +83,7 @@ static inline void dmz_bio_endio(struct bio *bio, blk_status_t status)
>
> if (status != BLK_STS_OK && bio->bi_status == BLK_STS_OK)
> bio->bi_status = status;
> - if (bio->bi_status != BLK_STS_OK)
> + if (bioctx->dev && bio->bi_status != BLK_STS_OK)
> bioctx->dev->flags |= DMZ_CHECK_BDEV;
>
> if (refcount_dec_and_test(&bioctx->ref)) {
> @@ -690,60 +692,64 @@ static int dmz_map(struct dm_target *ti, struct bio *bio)
> /*
> * Get zoned device information.
> */
> -static int dmz_get_zoned_device(struct dm_target *ti, char *path)
> +static int dmz_get_zoned_device(struct dm_target *ti, char *path,
> + int idx, int nr_devs)
> {
> struct dmz_target *dmz = ti->private;
> - struct request_queue *q;
> + struct dm_dev *ddev;
> struct dmz_dev *dev;
> - sector_t aligned_capacity;
> int ret;
> + struct block_device *bdev;
>
> /* Get the target device */
> - ret = dm_get_device(ti, path, dm_table_get_mode(ti->table), &dmz->ddev);
> + ret = dm_get_device(ti, path, dm_table_get_mode(ti->table), &ddev);
> if (ret) {
> ti->error = "Get target device failed";
> - dmz->ddev = NULL;
> return ret;
> }
>
> - dev = kzalloc(sizeof(struct dmz_dev), GFP_KERNEL);
> - if (!dev) {
> - ret = -ENOMEM;
> - goto err;
> + bdev = ddev->bdev;
> + if (bdev_zoned_model(bdev) == BLK_ZONED_NONE) {
> + if (nr_devs == 1) {
> + ti->error = "Invalid regular device";
> + goto err;
> + }
> + if (idx != 0) {
> + ti->error = "First device must be a regular device";
> + goto err;
> + }
> + if (dmz->ddev[0]) {
> + ti->error = "Too many regular devices";
> + goto err;
> + }
> + dev = &dmz->dev[idx];
> + dev->flags = DMZ_BDEV_REGULAR;
> + } else {
> + if (dmz->ddev[idx]) {
> + ti->error = "Too many zoned devices";
> + goto err;
> + }
> + if (nr_devs > 1 && idx == 0) {
> + ti->error = "First device must be a regular device";
> + goto err;
> + }
> + dev = &dmz->dev[idx];
> }
> -
> - dev->bdev = dmz->ddev->bdev;
> + dev->bdev = bdev;
> (void)bdevname(dev->bdev, dev->name);
>
> - if (bdev_zoned_model(dev->bdev) == BLK_ZONED_NONE) {
> - ti->error = "Not a zoned block device";
> - ret = -EINVAL;
> - goto err;
> - }
> -
> - q = bdev_get_queue(dev->bdev);
> - dev->capacity = i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT;
> - aligned_capacity = dev->capacity &
> - ~((sector_t)blk_queue_zone_sectors(q) - 1);
> - if (ti->begin ||
> - ((ti->len != dev->capacity) && (ti->len != aligned_capacity))) {
> - ti->error = "Partial mapping not supported";
> - ret = -EINVAL;
> + dev->capacity = i_size_read(bdev->bd_inode) >> SECTOR_SHIFT;
> + if (ti->begin) {
> + ti->error = "Partial mapping is not supported";
> goto err;
> }
>
> - dev->zone_nr_sectors = blk_queue_zone_sectors(q);
> -
> - dev->nr_zones = blkdev_nr_zones(dev->bdev->bd_disk);
> -
> - dmz->dev = dev;
> + dmz->ddev[idx] = ddev;
>
> return 0;
> err:
> - dm_put_device(ti, dmz->ddev);
> - kfree(dev);
> -
> - return ret;
> + dm_put_device(ti, ddev);
> + return -EINVAL;
> }
>
> /*
> @@ -752,10 +758,56 @@ static int dmz_get_zoned_device(struct dm_target *ti, char *path)
> static void dmz_put_zoned_device(struct dm_target *ti)
> {
> struct dmz_target *dmz = ti->private;
> + int i;
>
> - dm_put_device(ti, dmz->ddev);
> - kfree(dmz->dev);
> - dmz->dev = NULL;
> + for (i = 0; i < DMZ_MAX_DEVS; i++) {
> + if (dmz->ddev[i]) {
> + dm_put_device(ti, dmz->ddev[i]);
> + dmz->ddev[i] = NULL;
> + }
> + }
> +}
> +
> +static int dmz_fixup_devices(struct dm_target *ti)
> +{
> + struct dmz_target *dmz = ti->private;
> + struct dmz_dev *reg_dev, *zoned_dev;
> + struct request_queue *q;
> +
> + /*
> + * When we have two devices, the first one must be a regular block
> + * device and the second a zoned block device.
> + */
> + if (dmz->ddev[0] && dmz->ddev[1]) {
> + reg_dev = &dmz->dev[0];
> + if (!(reg_dev->flags & DMZ_BDEV_REGULAR)) {
> + ti->error = "Primary disk is not a regular device";
> + return -EINVAL;
> + }
> + zoned_dev = &dmz->dev[1];
> + if (zoned_dev->flags & DMZ_BDEV_REGULAR) {
> + ti->error = "Secondary disk is not a zoned device";
> + return -EINVAL;
> + }
> + } else {
> + reg_dev = NULL;
> + zoned_dev = &dmz->dev[0];
> + if (zoned_dev->flags & DMZ_BDEV_REGULAR) {
> + ti->error = "Disk is not a zoned device";
> + return -EINVAL;
> + }
> + }
> + q = bdev_get_queue(zoned_dev->bdev);
> + zoned_dev->zone_nr_sectors = blk_queue_zone_sectors(q);
> + zoned_dev->nr_zones = blkdev_nr_zones(zoned_dev->bdev->bd_disk);
> +
> + if (reg_dev) {
> + reg_dev->zone_nr_sectors = zoned_dev->zone_nr_sectors;
> + reg_dev->nr_zones = DIV_ROUND_UP(reg_dev->capacity,
> + reg_dev->zone_nr_sectors);
> + zoned_dev->zone_offset = reg_dev->nr_zones;
> + }
> + return 0;
> }
>
> /*
> @@ -764,11 +816,10 @@ static void dmz_put_zoned_device(struct dm_target *ti)
> static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
> {
> struct dmz_target *dmz;
> - struct dmz_dev *dev;
> int ret;
>
> /* Check arguments */
> - if (argc != 1) {
> + if (argc < 1 || argc > 2) {
> ti->error = "Invalid argument count";
> return -EINVAL;
> }
> @@ -779,18 +830,34 @@ static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
> ti->error = "Unable to allocate the zoned target descriptor";
> return -ENOMEM;
> }
> + dmz->dev = kcalloc(2, sizeof(struct dmz_dev), GFP_KERNEL);
> + if (!dmz->dev) {
> + ti->error = "Unable to allocate the zoned device descriptors";
> + kfree(dmz);
> + return -ENOMEM;
> + }
> ti->private = dmz;
>
> /* Get the target zoned block device */
> - ret = dmz_get_zoned_device(ti, argv[0]);
> + ret = dmz_get_zoned_device(ti, argv[0], 0, argc);
> + if (ret)
> + goto err;
> +
> + if (argc == 2) {
> + ret = dmz_get_zoned_device(ti, argv[1], 1, argc);
> + if (ret) {
> + dmz_put_zoned_device(ti);
> + goto err;
> + }
> + }
> + ret = dmz_fixup_devices(ti);
> if (ret) {
> - dmz->ddev = NULL;
> + dmz_put_zoned_device(ti);
> goto err;
> }
>
> /* Initialize metadata */
> - dev = dmz->dev;
> - ret = dmz_ctr_metadata(dev, &dmz->metadata,
> + ret = dmz_ctr_metadata(dmz->dev, argc, &dmz->metadata,
> dm_table_device_name(ti->table));
> if (ret) {
> ti->error = "Metadata initialization failed";
> @@ -867,6 +934,7 @@ static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
> err_dev:
> dmz_put_zoned_device(ti);
> err:
> + kfree(dmz->dev);
> kfree(dmz);
>
> return ret;
> @@ -897,6 +965,7 @@ static void dmz_dtr(struct dm_target *ti)
>
> mutex_destroy(&dmz->chunk_lock);
>
> + kfree(dmz->dev);
> kfree(dmz);
> }
>
> @@ -971,10 +1040,17 @@ static int dmz_iterate_devices(struct dm_target *ti,
> iterate_devices_callout_fn fn, void *data)
> {
> struct dmz_target *dmz = ti->private;
> - struct dmz_dev *dev = dmz->dev;
> - sector_t capacity = dev->capacity & ~(dmz_zone_nr_sectors(dmz->metadata) - 1);
> -
> - return fn(ti, dmz->ddev, 0, capacity, data);
> + unsigned int zone_nr_sectors = dmz_zone_nr_sectors(dmz->metadata);
> + sector_t capacity;
> + int r;
> +
> + capacity = dmz->dev[0].capacity & ~(zone_nr_sectors - 1);
> + r = fn(ti, dmz->ddev[0], 0, capacity, data);
> + if (!r && dmz->ddev[1]) {
> + capacity = dmz->dev[1].capacity & ~(zone_nr_sectors - 1);
> + r = fn(ti, dmz->ddev[1], 0, capacity, data);
> + }
> + return r;
> }
>
> static void dmz_status(struct dm_target *ti, status_type_t type,
> @@ -984,6 +1060,7 @@ static void dmz_status(struct dm_target *ti, status_type_t type,
> struct dmz_target *dmz = ti->private;
> ssize_t sz = 0;
> char buf[BDEVNAME_SIZE];
> + struct dmz_dev *dev;
>
> switch (type) {
> case STATUSTYPE_INFO:
> @@ -995,8 +1072,14 @@ static void dmz_status(struct dm_target *ti, status_type_t type,
> dmz_nr_seq_zones(dmz->metadata));
> break;
> case STATUSTYPE_TABLE:
> - format_dev_t(buf, dmz->dev->bdev->bd_dev);
> + dev = &dmz->dev[0];
> + format_dev_t(buf, dev->bdev->bd_dev);
> DMEMIT("%s", buf);
> + if (dmz->dev[1].bdev) {
> + dev = &dmz->dev[1];
> + format_dev_t(buf, dev->bdev->bd_dev);
> + DMEMIT(" %s", buf);
> + }
> break;
> }
> return;
> @@ -1018,7 +1101,7 @@ static int dmz_message(struct dm_target *ti, unsigned int argc, char **argv,
>
> static struct target_type dmz_type = {
> .name = "zoned",
> - .version = {1, 1, 0},
> + .version = {2, 0, 0},
> .features = DM_TARGET_SINGLETON | DM_TARGET_ZONED_HM,
> .module = THIS_MODULE,
> .ctr = dmz_ctr,
> diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
> index 2629bd51fa26..4971a765be55 100644
> --- a/drivers/md/dm-zoned.h
> +++ b/drivers/md/dm-zoned.h
> @@ -52,10 +52,12 @@ struct dmz_dev {
> struct block_device *bdev;
>
> char name[BDEVNAME_SIZE];
> + uuid_t uuid;
>
> sector_t capacity;
>
> unsigned int nr_zones;
> + unsigned int zone_offset;
>
> unsigned int flags;
>
> @@ -69,6 +71,7 @@ struct dmz_dev {
> /* Device flags. */
> #define DMZ_BDEV_DYING (1 << 0)
> #define DMZ_CHECK_BDEV (2 << 0)
> +#define DMZ_BDEV_REGULAR (4 << 0)
>
> /*
> * Zone descriptor.
> @@ -163,8 +166,8 @@ struct dmz_reclaim;
> /*
> * Functions defined in dm-zoned-metadata.c
> */
> -int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **zmd,
> - const char *devname);
> +int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
> + struct dmz_metadata **zmd, const char *devname);
> void dmz_dtr_metadata(struct dmz_metadata *zmd);
> int dmz_resume_metadata(struct dmz_metadata *zmd);
>
>
--
Damien Le Moal
Western Digital Research
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