On Wed, 2020-05-27 at 08:22 +0200, Hannes Reinecke wrote:
> Remove the hard-coded limit of two devices and support an unlimited
> number of additional zoned devices.
> With that we need to increase the device-mapper version number to
> 3.0.0 as we've modified the interface.
>
> Signed-off-by: Hannes Reinecke <[email protected]>
> ---
> drivers/md/dm-zoned-metadata.c | 15 +++++++-
> drivers/md/dm-zoned-target.c | 81
> +++++++++++++++++++++++-------------------
> 2 files changed, 59 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
> index f309219a5457..689c1dd7ab20 100644
> --- a/drivers/md/dm-zoned-metadata.c
> +++ b/drivers/md/dm-zoned-metadata.c
> @@ -1520,7 +1520,20 @@ static int dmz_init_zones(struct dmz_metadata *zmd)
> */
> zmd->sb[0].zone = dmz_get(zmd, 0);
>
> - zoned_dev = &zmd->dev[1];
> + for (i = 1; i < zmd->nr_devs; i++) {
> + zoned_dev = &zmd->dev[i];
> +
> + ret = blkdev_report_zones(zoned_dev->bdev, 0,
> + BLK_ALL_ZONES,
> + dmz_init_zone, zoned_dev);
> + if (ret < 0) {
> + DMDEBUG("(%s): Failed to report zones, error
> %d",
> + zmd->devname, ret);
> + dmz_drop_zones(zmd);
> + return ret;
> + }
> + }
> + return 0;
> }
>
> /*
> diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
> index f6f00a363903..4a51738d4b0d 100644
> --- a/drivers/md/dm-zoned-target.c
> +++ b/drivers/md/dm-zoned-target.c
> @@ -13,8 +13,6 @@
>
> #define DMZ_MIN_BIOS 8192
>
> -#define DMZ_MAX_DEVS 2
This should probably be done in patch 9, and that will naturally fix
the forgotten out-of-bound loop access in patch 11.
Or just merge this patch with patch 9 ?
> -
> /*
> * Zone BIO context.
> */
> @@ -764,7 +762,7 @@ static void dmz_put_zoned_device(struct dm_target *ti)
> struct dmz_target *dmz = ti->private;
> int i;
>
> - for (i = 0; i < DMZ_MAX_DEVS; i++) {
> + for (i = 0; i < dmz->nr_ddevs; i++) {
> if (dmz->ddev[i]) {
> dm_put_device(ti, dmz->ddev[i]);
> dmz->ddev[i] = NULL;
> @@ -777,21 +775,35 @@ 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;
> + sector_t zone_nr_sectors = 0;
> + int i;
>
> /*
> - * When we have two devices, the first one must be a regular block
> - * device and the second a zoned block device.
> + * When we have more than on devices, the first one must be a
> + * regular block device and the others zoned block devices.
> */
> - if (dmz->ddev[0] && dmz->ddev[1]) {
> + if (dmz->nr_ddevs > 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;
> + for (i = 1; i < dmz->nr_ddevs; i++) {
> + zoned_dev = &dmz->dev[i];
> + if (zoned_dev->flags & DMZ_BDEV_REGULAR) {
> + ti->error = "Secondary disk is not a zoned
> device";
> + return -EINVAL;
> + }
> + q = bdev_get_queue(zoned_dev->bdev);
> + if (zone_nr_sectors &&
> + zone_nr_sectors != blk_queue_zone_sectors(q)) {
> + ti->error = "Zone nr sectors mismatch";
> + return -EINVAL;
> + }
> + zone_nr_sectors = blk_queue_zone_sectors(q);
> + zoned_dev->zone_nr_sectors = zone_nr_sectors;
> + zoned_dev->nr_zones =
> + blkdev_nr_zones(zoned_dev->bdev->bd_disk);
> }
> } else {
> reg_dev = NULL;
> @@ -800,17 +812,24 @@ static int dmz_fixup_devices(struct dm_target *ti)
> 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);
> }
> - 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;
> + sector_t zone_offset;
> +
> + reg_dev->zone_nr_sectors = zone_nr_sectors;
> reg_dev->nr_zones =
> DIV_ROUND_UP_SECTOR_T(reg_dev->capacity,
> reg_dev->zone_nr_sectors);
> - zoned_dev->zone_offset = reg_dev->nr_zones;
> + reg_dev->zone_offset = 0;
> + zone_offset = reg_dev->nr_zones;
> + for (i = 1; i < dmz->nr_ddevs; i++) {
> + dmz->dev[i].zone_offset = zone_offset;
> + zone_offset += dmz->dev[i].nr_zones;
> + }
> }
> return 0;
> }
> @@ -824,7 +843,7 @@ static int dmz_ctr(struct dm_target *ti, unsigned int
> argc, char **argv)
> int ret, i;
>
> /* Check arguments */
> - if (argc < 1 || argc > 2) {
> + if (argc < 1) {
> ti->error = "Invalid argument count";
> return -EINVAL;
> }
> @@ -852,22 +871,14 @@ static int dmz_ctr(struct dm_target *ti, unsigned int
> argc, char **argv)
> ti->private = dmz;
>
> /* Get the target zoned block device */
> - 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;
> - }
> + for (i = 0; i < argc; i++) {
> + ret = dmz_get_zoned_device(ti, argv[i], i, argc);
> + if (ret)
> + goto err_dev;
> }
> ret = dmz_fixup_devices(ti);
> - if (ret) {
> - dmz_put_zoned_device(ti);
> - goto err;
> - }
> + if (ret)
> + goto err_dev;
>
> /* Initialize metadata */
> ret = dmz_ctr_metadata(dmz->dev, argc, &dmz->metadata,
> @@ -1090,9 +1101,7 @@ static void dmz_status(struct dm_target *ti,
> status_type_t type,
> dmz_nr_zones(dmz->metadata),
> dmz_nr_unmap_cache_zones(dmz->metadata),
> dmz_nr_cache_zones(dmz->metadata));
> - for (i = 0; i < DMZ_MAX_DEVS; i++) {
> - if (!dmz->ddev[i])
> - continue;
> + for (i = 0; i < dmz->nr_ddevs; i++) {
> /*
> * For a multi-device setup the first device
> * contains only cache zones.
> @@ -1111,8 +1120,8 @@ static void dmz_status(struct dm_target *ti,
> status_type_t type,
> dev = &dmz->dev[0];
> format_dev_t(buf, dev->bdev->bd_dev);
> DMEMIT("%s", buf);
> - if (dmz->nr_ddevs > 1) {
> - dev = &dmz->dev[1];
> + for (i = 1; i < dmz->nr_ddevs; i++) {
> + dev = &dmz->dev[i];
> format_dev_t(buf, dev->bdev->bd_dev);
> DMEMIT(" %s", buf);
> }
> @@ -1140,7 +1149,7 @@ static int dmz_message(struct dm_target *ti, unsigned
> int argc, char **argv,
>
> static struct target_type dmz_type = {
> .name = "zoned",
> - .version = {2, 0, 0},
> + .version = {3, 0, 0},
> .features = DM_TARGET_SINGLETON | DM_TARGET_ZONED_HM,
> .module = THIS_MODULE,
> .ctr = dmz_ctr,
Apart from the nit above, looks good.
Reviewed-by: Damien Le Moal <[email protected]>
--
Damien Le Moal
Western Digital Research
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