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dm zoned: support arbitrary number of devices 

Remove the hard-coded limit of two devices and support an unlimited
number of additional zoned devices.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Hannes Reinecke 2020-06-02 13:09:52 +02:00 committed by Mike Snitzer
parent bd82fdabf1
commit 4dba12881f
2 changed files with 74 additions and 45 deletions
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15
drivers/md/dm-zoned-metadata.c
View File

@ -1525,7 +1525,20 @@ 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;
}
/*

104
drivers/md/dm-zoned-target.c
View File

@ -13,8 +13,6 @@
#define DMZ_MIN_BIOS 8192
#define DMZ_MAX_DEVS 2
/*
* Zone BIO context.
*/
@ -40,10 +38,10 @@ struct dm_chunk_work {
* Target descriptor.
*/
struct dmz_target {
struct dm_dev *ddev[DMZ_MAX_DEVS];
struct dm_dev **ddev;
unsigned int nr_ddevs;
unsigned long flags;
unsigned int flags;
/* Zoned block device information */
struct dmz_dev *dev;
@ -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;
}
@ -835,32 +854,31 @@ 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);
dmz->dev = kcalloc(argc, sizeof(struct dmz_dev), GFP_KERNEL);
if (!dmz->dev) {
ti->error = "Unable to allocate the zoned device descriptors";
kfree(dmz);
return -ENOMEM;
}
dmz->ddev = kcalloc(argc, sizeof(struct dm_dev *), GFP_KERNEL);
if (!dmz->ddev) {
ti->error = "Unable to allocate the dm device descriptors";
ret = -ENOMEM;
goto err;
}
dmz->nr_ddevs = argc;
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,
@ -1056,13 +1074,13 @@ static int dmz_iterate_devices(struct dm_target *ti,
struct dmz_target *dmz = ti->private;
unsigned int zone_nr_sectors = dmz_zone_nr_sectors(dmz->metadata);
sector_t capacity;
int r;
int i, 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);
for (i = 0; i < dmz->nr_ddevs; i++) {
capacity = dmz->dev[i].capacity & ~(zone_nr_sectors - 1);
r = fn(ti, dmz->ddev[i], 0, capacity, data);
if (r)
break;
}
return r;
}
@ -1083,9 +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.
@ -1104,8 +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->dev[1].bdev) {
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);
}