* [PATCH 01/15] dm-zoned: add debugging message for reading superblocks
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 02/15] dm-zoned: secondary superblock must reside on the same devices than primary superblock Hannes Reinecke
` (14 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 4a2e351365c5..ef1524d5928a 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1105,6 +1105,10 @@ static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
*/
static int dmz_read_sb(struct dmz_metadata *zmd, unsigned int set)
{
+ dmz_zmd_debug(zmd, "read superblock set %d dev %s block %llu",
+ set, zmd->sb[set].dev->name,
+ zmd->sb[set].block);
+
return dmz_rdwr_block(zmd->sb[set].dev, REQ_OP_READ,
zmd->sb[set].block, zmd->sb[set].mblk->page);
}
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 02/15] dm-zoned: secondary superblock must reside on the same devices than primary superblock
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
2020-06-02 11:09 ` [PATCH 01/15] dm-zoned: add debugging message for reading superblocks Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 03/15] dm-zoned: improve logging messages for reclaim Hannes Reinecke
` (13 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
The secondary superblock must reside on the same device than the
primary superblock, so there's no need to re-calculate the device.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index ef1524d5928a..043ed882970a 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1135,7 +1135,7 @@ static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd)
/* Bad first super block: search for the second one */
zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks;
zmd->sb[1].zone = zmd->sb[0].zone + 1;
- zmd->sb[1].dev = dmz_zone_to_dev(zmd, zmd->sb[1].zone);
+ zmd->sb[1].dev = zmd->sb[0].dev;
for (i = 0; i < zmd->nr_rnd_zones - 1; i++) {
if (dmz_read_sb(zmd, 1) != 0)
break;
@@ -1144,7 +1144,6 @@ static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd)
return 0;
}
zmd->sb[1].block += zone_nr_blocks;
- zmd->sb[1].dev = dmz_zone_to_dev(zmd, zmd->sb[1].zone + i);
}
dmz_free_mblock(zmd, mblk);
@@ -1263,7 +1262,7 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
if (!zmd->sb[1].zone)
zmd->sb[1].zone = zmd->sb[0].zone + zmd->nr_meta_zones;
zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
- zmd->sb[1].dev = dmz_zone_to_dev(zmd, zmd->sb[1].zone);
+ zmd->sb[1].dev = zmd->sb[0].dev;
ret = dmz_get_sb(zmd, 1);
} else
ret = dmz_lookup_secondary_sb(zmd);
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 03/15] dm-zoned: improve logging messages for reclaim
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
2020-06-02 11:09 ` [PATCH 01/15] dm-zoned: add debugging message for reading superblocks Hannes Reinecke
2020-06-02 11:09 ` [PATCH 02/15] dm-zoned: secondary superblock must reside on the same devices than primary superblock Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 04/15] dm-zoned: add a 'reserved' zone flag Hannes Reinecke
` (12 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
Instead of just reporting the errno this patch adds some more
verbose debugging message in the reclaim path.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-reclaim.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
index 571bc1d41bab..fd4d47dfcea1 100644
--- a/drivers/md/dm-zoned-reclaim.c
+++ b/drivers/md/dm-zoned-reclaim.c
@@ -371,8 +371,11 @@ static int dmz_do_reclaim(struct dmz_reclaim *zrc)
/* Get a data zone */
dzone = dmz_get_zone_for_reclaim(zmd, dmz_target_idle(zrc));
- if (!dzone)
+ if (!dzone) {
+ DMDEBUG("(%s): No zone found to reclaim",
+ dmz_metadata_label(zmd));
return -EBUSY;
+ }
start = jiffies;
if (dmz_is_cache(dzone) || dmz_is_rnd(dzone)) {
@@ -416,6 +419,12 @@ static int dmz_do_reclaim(struct dmz_reclaim *zrc)
}
out:
if (ret) {
+ if (ret == -EINTR)
+ DMDEBUG("(%s): reclaim zone %u interrupted",
+ dmz_metadata_label(zmd), rzone->id);
+ else
+ DMDEBUG("(%s): Failed to reclaim zone %u, err %d",
+ dmz_metadata_label(zmd), rzone->id, ret);
dmz_unlock_zone_reclaim(dzone);
return ret;
}
@@ -519,8 +528,6 @@ static void dmz_reclaim_work(struct work_struct *work)
ret = dmz_do_reclaim(zrc);
if (ret && ret != -EINTR) {
- DMDEBUG("(%s): Reclaim error %d",
- dmz_metadata_label(zmd), ret);
if (!dmz_check_dev(zmd))
return;
}
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 04/15] dm-zoned: add a 'reserved' zone flag
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (2 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 03/15] dm-zoned: improve logging messages for reclaim Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 05/15] dm-zoned: convert to xarray Hannes Reinecke
` (11 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
Instead of counting the number of reserved zones in dmz_free_zone()
we should mark the zone as 'reserved' during allocation and simplify
dmz_free_zone().
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 4 ++--
drivers/md/dm-zoned.h | 2 ++
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 043ed882970a..0982ab1758a6 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1743,6 +1743,7 @@ static int dmz_load_mapping(struct dmz_metadata *zmd)
atomic_inc(&zmd->unmap_nr_rnd);
} else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) {
list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list);
+ set_bit(DMZ_RESERVED, &dzone->flags);
atomic_inc(&zmd->nr_reserved_seq_zones);
zmd->nr_seq--;
} else {
@@ -2168,8 +2169,7 @@ void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
} else if (dmz_is_rnd(zone)) {
list_add_tail(&zone->link, &zmd->unmap_rnd_list);
atomic_inc(&zmd->unmap_nr_rnd);
- } else if (atomic_read(&zmd->nr_reserved_seq_zones) <
- zmd->nr_reserved_seq) {
+ } else if (dmz_is_reserved(zone)) {
list_add_tail(&zone->link, &zmd->reserved_seq_zones_list);
atomic_inc(&zmd->nr_reserved_seq_zones);
} else {
diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
index 8083607b9535..3451b5a768b4 100644
--- a/drivers/md/dm-zoned.h
+++ b/drivers/md/dm-zoned.h
@@ -123,6 +123,7 @@ enum {
DMZ_META,
DMZ_DATA,
DMZ_BUF,
+ DMZ_RESERVED,
/* Zone internal state */
DMZ_RECLAIM,
@@ -140,6 +141,7 @@ enum {
#define dmz_is_offline(z) test_bit(DMZ_OFFLINE, &(z)->flags)
#define dmz_is_readonly(z) test_bit(DMZ_READ_ONLY, &(z)->flags)
#define dmz_in_reclaim(z) test_bit(DMZ_RECLAIM, &(z)->flags)
+#define dmz_is_reserved(z) test_bit(DMZ_RESERVED, &(z)->flags)
#define dmz_seq_write_err(z) test_bit(DMZ_SEQ_WRITE_ERR, &(z)->flags)
#define dmz_reclaim_should_terminate(z) \
test_bit(DMZ_RECLAIM_TERMINATE, &(z)->flags)
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 05/15] dm-zoned: convert to xarray
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (3 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 04/15] dm-zoned: add a 'reserved' zone flag Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 06/15] dm-zoned: temporary superblock for tertiary devices Hannes Reinecke
` (10 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
The zones array is getting really large, and large arrays
tend to wreak havoc with the CPU caches.
So convert it to xarray to become more cache friendly.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 120 ++++++++++++++++++++++++++++++-----------
1 file changed, 88 insertions(+), 32 deletions(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 0982ab1758a6..839f9078806d 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -172,7 +172,7 @@ struct dmz_metadata {
unsigned int nr_chunks;
/* Zone information array */
- struct dm_zone *zones;
+ struct xarray zones;
struct dmz_sb sb[3];
unsigned int mblk_primary;
@@ -327,6 +327,30 @@ unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd)
return atomic_read(&zmd->unmap_nr_seq);
}
+static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id)
+{
+ return xa_load(&zmd->zones, zone_id);
+}
+
+static struct dm_zone *dmz_insert(struct dmz_metadata *zmd,
+ unsigned int zone_id)
+{
+ struct dm_zone *zone = kzalloc(sizeof(struct dm_zone), GFP_KERNEL);
+
+ if (!zone)
+ return ERR_PTR(-ENOMEM);
+
+ if (xa_insert(&zmd->zones, zone_id, zone, GFP_KERNEL))
+ return ERR_PTR(-EBUSY);
+
+ INIT_LIST_HEAD(&zone->link);
+ atomic_set(&zone->refcount, 0);
+ zone->id = zone_id;
+ zone->chunk = DMZ_MAP_UNMAPPED;
+
+ return zone;
+}
+
const char *dmz_metadata_label(struct dmz_metadata *zmd)
{
return (const char *)zmd->label;
@@ -1122,6 +1146,7 @@ static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd)
{
unsigned int zone_nr_blocks = zmd->zone_nr_blocks;
struct dmz_mblock *mblk;
+ unsigned int zone_id = zmd->sb[0].zone->id;
int i;
/* Allocate a block */
@@ -1134,16 +1159,15 @@ static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd)
/* Bad first super block: search for the second one */
zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks;
- zmd->sb[1].zone = zmd->sb[0].zone + 1;
+ zmd->sb[1].zone = dmz_get(zmd, zone_id + 1);
zmd->sb[1].dev = zmd->sb[0].dev;
- for (i = 0; i < zmd->nr_rnd_zones - 1; i++) {
+ for (i = 1; i < zmd->nr_rnd_zones; i++) {
if (dmz_read_sb(zmd, 1) != 0)
break;
- if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC) {
- zmd->sb[1].zone += i;
+ if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC)
return 0;
- }
zmd->sb[1].block += zone_nr_blocks;
+ zmd->sb[1].zone = dmz_get(zmd, zone_id + i);
}
dmz_free_mblock(zmd, mblk);
@@ -1259,8 +1283,12 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
/* Read and check secondary super block */
if (ret == 0) {
sb_good[0] = true;
- if (!zmd->sb[1].zone)
- zmd->sb[1].zone = zmd->sb[0].zone + zmd->nr_meta_zones;
+ if (!zmd->sb[1].zone) {
+ unsigned int zone_id =
+ zmd->sb[0].zone->id + zmd->nr_meta_zones;
+
+ zmd->sb[1].zone = dmz_get(zmd, zone_id);
+ }
zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
zmd->sb[1].dev = zmd->sb[0].dev;
ret = dmz_get_sb(zmd, 1);
@@ -1341,7 +1369,11 @@ 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 dm_zone *zone;
+
+ zone = dmz_insert(zmd, idx);
+ if (IS_ERR(zone))
+ return PTR_ERR(zone);
if (blkz->len != zmd->zone_nr_sectors) {
if (zmd->sb_version > 1) {
@@ -1353,11 +1385,6 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
return -ENXIO;
}
- INIT_LIST_HEAD(&zone->link);
- atomic_set(&zone->refcount, 0);
- zone->id = idx;
- zone->chunk = DMZ_MAP_UNMAPPED;
-
switch (blkz->type) {
case BLK_ZONE_TYPE_CONVENTIONAL:
set_bit(DMZ_RND, &zone->flags);
@@ -1397,18 +1424,17 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
return 0;
}
-static void dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev)
+static int 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];
+ struct dm_zone *zone;
- INIT_LIST_HEAD(&zone->link);
- atomic_set(&zone->refcount, 0);
- zone->id = idx;
- zone->chunk = DMZ_MAP_UNMAPPED;
+ zone = dmz_insert(zmd, idx);
+ if (IS_ERR(zone))
+ return PTR_ERR(zone);
set_bit(DMZ_CACHE, &zone->flags);
zone->wp_block = 0;
zmd->nr_cache_zones++;
@@ -1420,6 +1446,7 @@ static void dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev)
}
zone_offset += zmd->zone_nr_sectors;
}
+ return 0;
}
/*
@@ -1427,8 +1454,15 @@ static void dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev)
*/
static void dmz_drop_zones(struct dmz_metadata *zmd)
{
- kfree(zmd->zones);
- zmd->zones = NULL;
+ int idx;
+
+ for(idx = 0; idx < zmd->nr_zones; idx++) {
+ struct dm_zone *zone = xa_load(&zmd->zones, idx);
+
+ kfree(zone);
+ xa_erase(&zmd->zones, idx);
+ }
+ xa_destroy(&zmd->zones);
}
/*
@@ -1460,20 +1494,25 @@ static int dmz_init_zones(struct dmz_metadata *zmd)
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;
+ xa_init(&zmd->zones);
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]);
+ ret = dmz_emulate_zones(zmd, &zmd->dev[0]);
+ if (ret < 0) {
+ DMDEBUG("(%s): Failed to emulate zones, error %d",
+ zmd->devname, ret);
+ dmz_drop_zones(zmd);
+ return ret;
+ }
+
/*
* Primary superblock zone is always at zone 0 when multiple
* drives are present.
*/
- zmd->sb[0].zone = &zmd->zones[0];
+ zmd->sb[0].zone = dmz_get(zmd, 0);
zoned_dev = &zmd->dev[1];
}
@@ -1576,11 +1615,6 @@ static int dmz_handle_seq_write_err(struct dmz_metadata *zmd,
return 0;
}
-static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id)
-{
- return &zmd->zones[zone_id];
-}
-
/*
* Reset a zone write pointer.
*/
@@ -1662,6 +1696,11 @@ static int dmz_load_mapping(struct dmz_metadata *zmd)
}
dzone = dmz_get(zmd, dzone_id);
+ if (!dzone) {
+ dmz_zmd_err(zmd, "Chunk %u mapping: data zone %u not present",
+ chunk, dzone_id);
+ return -EIO;
+ }
set_bit(DMZ_DATA, &dzone->flags);
dzone->chunk = chunk;
dmz_get_zone_weight(zmd, dzone);
@@ -1685,6 +1724,11 @@ static int dmz_load_mapping(struct dmz_metadata *zmd)
}
bzone = dmz_get(zmd, bzone_id);
+ if (!bzone) {
+ dmz_zmd_err(zmd, "Chunk %u mapping: buffer zone %u not present",
+ chunk, bzone_id);
+ return -EIO;
+ }
if (!dmz_is_rnd(bzone) && !dmz_is_cache(bzone)) {
dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone %u",
chunk, bzone_id);
@@ -1715,6 +1759,8 @@ static int dmz_load_mapping(struct dmz_metadata *zmd)
*/
for (i = 0; i < zmd->nr_zones; i++) {
dzone = dmz_get(zmd, i);
+ if (!dzone)
+ continue;
if (dmz_is_meta(dzone))
continue;
if (dmz_is_offline(dzone))
@@ -1978,6 +2024,10 @@ struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chu
} else {
/* The chunk is already mapped: get the mapping zone */
dzone = dmz_get(zmd, dzone_id);
+ if (!dzone) {
+ dzone = ERR_PTR(-EIO);
+ goto out;
+ }
if (dzone->chunk != chunk) {
dzone = ERR_PTR(-EIO);
goto out;
@@ -2794,6 +2844,12 @@ int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
/* 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 (!zone) {
+ dmz_zmd_err(zmd,
+ "metadata zone %u not present", i);
+ ret = -ENXIO;
+ goto err;
+ }
if (!dmz_is_rnd(zone) && !dmz_is_cache(zone)) {
dmz_zmd_err(zmd,
"metadata zone %d is not random", i);
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 06/15] dm-zoned: temporary superblock for tertiary devices
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (4 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 05/15] dm-zoned: convert to xarray Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 07/15] dm-zoned: add device pointer to struct dm_zone Hannes Reinecke
` (9 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
Checking the tertiary superblock just consists of validating UUIDs,
crcs, and the generation number; it doesn't have contents which
would be required during the actual operation.
So we should be allocating a temporary superblock when checking
tertiary devices and avoid having to store it together with the
'real' superblocks.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 109 +++++++++++++++++++++++------------------
1 file changed, 61 insertions(+), 48 deletions(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 839f9078806d..d9f3ecc76eff 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -174,7 +174,7 @@ struct dmz_metadata {
/* Zone information array */
struct xarray zones;
- struct dmz_sb sb[3];
+ struct dmz_sb sb[2];
unsigned int mblk_primary;
unsigned int sb_version;
u64 sb_gen;
@@ -1014,10 +1014,11 @@ int dmz_flush_metadata(struct dmz_metadata *zmd)
/*
* Check super block.
*/
-static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
+static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_sb *dsb,
+ bool tertiary)
{
- struct dmz_super *sb = zmd->sb[set].sb;
- struct dmz_dev *dev = zmd->sb[set].dev;
+ struct dmz_super *sb = dsb->sb;
+ struct dmz_dev *dev = dsb->dev;
unsigned int nr_meta_zones, nr_data_zones;
u32 crc, stored_crc;
u64 gen;
@@ -1034,7 +1035,7 @@ static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
DMZ_META_VER, zmd->sb_version);
return -EINVAL;
}
- if ((zmd->sb_version < 1) && (set == 2)) {
+ if (zmd->sb_version < 2 && tertiary) {
dmz_dev_err(dev, "Tertiary superblocks are not supported");
return -EINVAL;
}
@@ -1078,7 +1079,7 @@ static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
return -ENXIO;
}
- if (set == 2) {
+ if (tertiary) {
/*
* Generation number should be 0, but it doesn't
* really matter if it isn't.
@@ -1127,14 +1128,13 @@ static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
/*
* Read the first or second super block from disk.
*/
-static int dmz_read_sb(struct dmz_metadata *zmd, unsigned int set)
+static int dmz_read_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set)
{
dmz_zmd_debug(zmd, "read superblock set %d dev %s block %llu",
- set, zmd->sb[set].dev->name,
- zmd->sb[set].block);
+ set, sb->dev->name, sb->block);
- return dmz_rdwr_block(zmd->sb[set].dev, REQ_OP_READ,
- zmd->sb[set].block, zmd->sb[set].mblk->page);
+ return dmz_rdwr_block(sb->dev, REQ_OP_READ,
+ sb->block, sb->mblk->page);
}
/*
@@ -1162,7 +1162,7 @@ static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd)
zmd->sb[1].zone = dmz_get(zmd, zone_id + 1);
zmd->sb[1].dev = zmd->sb[0].dev;
for (i = 1; i < zmd->nr_rnd_zones; i++) {
- if (dmz_read_sb(zmd, 1) != 0)
+ if (dmz_read_sb(zmd, &zmd->sb[1], 1) != 0)
break;
if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC)
return 0;
@@ -1179,9 +1179,9 @@ static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd)
}
/*
- * Read the first or second super block from disk.
+ * Read a super block from disk.
*/
-static int dmz_get_sb(struct dmz_metadata *zmd, unsigned int set)
+static int dmz_get_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set)
{
struct dmz_mblock *mblk;
int ret;
@@ -1191,14 +1191,14 @@ static int dmz_get_sb(struct dmz_metadata *zmd, unsigned int set)
if (!mblk)
return -ENOMEM;
- zmd->sb[set].mblk = mblk;
- zmd->sb[set].sb = mblk->data;
+ sb->mblk = mblk;
+ sb->sb = mblk->data;
/* Read super block */
- ret = dmz_read_sb(zmd, set);
+ ret = dmz_read_sb(zmd, sb, set);
if (ret) {
dmz_free_mblock(zmd, mblk);
- zmd->sb[set].mblk = NULL;
+ sb->mblk = NULL;
return ret;
}
@@ -1272,13 +1272,13 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
/* Read and check the primary super block */
zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
zmd->sb[0].dev = dmz_zone_to_dev(zmd, zmd->sb[0].zone);
- ret = dmz_get_sb(zmd, 0);
+ ret = dmz_get_sb(zmd, &zmd->sb[0], 0);
if (ret) {
dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed");
return ret;
}
- ret = dmz_check_sb(zmd, 0);
+ ret = dmz_check_sb(zmd, &zmd->sb[0], false);
/* Read and check secondary super block */
if (ret == 0) {
@@ -1291,7 +1291,7 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
}
zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
zmd->sb[1].dev = zmd->sb[0].dev;
- ret = dmz_get_sb(zmd, 1);
+ ret = dmz_get_sb(zmd, &zmd->sb[1], 1);
} else
ret = dmz_lookup_secondary_sb(zmd);
@@ -1300,7 +1300,7 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
return ret;
}
- ret = dmz_check_sb(zmd, 1);
+ ret = dmz_check_sb(zmd, &zmd->sb[1], false);
if (ret == 0)
sb_good[1] = true;
@@ -1345,20 +1345,40 @@ 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;
+ if (zmd->sb_version > 1) {
+ int i;
+ struct dmz_sb *sb;
+
+ sb = kzalloc(sizeof(struct dmz_sb), GFP_KERNEL);
+ if (!sb)
+ return -ENOMEM;
+ for (i = 1; i < zmd->nr_devs; i++) {
+ sb->block = 0;
+ sb->zone = dmz_get(zmd, zmd->dev[i].zone_offset);
+ sb->dev = &zmd->dev[i];
+ if (!dmz_is_meta(sb->zone)) {
+ dmz_dev_err(sb->dev,
+ "Tertiary super block zone %u not marked as metadata zone",
+ sb->zone->id);
+ ret = -EINVAL;
+ goto out_kfree;
+ }
+ ret = dmz_get_sb(zmd, sb, i + 1);
+ if (ret) {
+ dmz_dev_err(sb->dev,
+ "Read tertiary super block failed");
+ dmz_free_mblock(zmd, sb->mblk);
+ goto out_kfree;
+ }
+ ret = dmz_check_sb(zmd, sb, true);
+ dmz_free_mblock(zmd, sb->mblk);
+ if (ret == -EINVAL)
+ goto out_kfree;
}
- ret = dmz_check_sb(zmd, 2);
- if (ret == -EINVAL)
- return ret;
+ out_kfree:
+ kfree(sb);
}
- return 0;
+ return ret;
}
/*
@@ -1415,12 +1435,15 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
zmd->sb[0].zone = zone;
}
}
- if (zmd->nr_devs > 1 && !zmd->sb[2].zone) {
- /* Tertiary superblock zone */
- zmd->sb[2].zone = zone;
+ if (zmd->nr_devs > 1 && num == 0) {
+ /*
+ * Tertiary superblock zones are always at the
+ * start of the zoned devices, so mark them
+ * as metadata zone.
+ */
+ set_bit(DMZ_META, &zone->flags);
}
}
-
return 0;
}
@@ -2858,16 +2881,6 @@ int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
}
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)
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 07/15] dm-zoned: add device pointer to struct dm_zone
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (5 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 06/15] dm-zoned: temporary superblock for tertiary devices Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 08/15] dm-zoned: add metadata pointer to struct dmz_dev Hannes Reinecke
` (8 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
Add a pointer to the containing device to struct dm_zone and
kill dmz_zone_to_dev().
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 39 ++++++++++-----------------------------
drivers/md/dm-zoned-reclaim.c | 13 +++++--------
drivers/md/dm-zoned-target.c | 2 +-
drivers/md/dm-zoned.h | 4 +++-
4 files changed, 19 insertions(+), 39 deletions(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index d9f3ecc76eff..45d6e96cb9a8 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -229,16 +229,10 @@ struct dmz_metadata {
*/
static 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;
+ return zone->id - zone->dev->zone_offset;
}
sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone)
@@ -255,18 +249,6 @@ sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *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];
-}
-
unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd)
{
return zmd->zone_nr_blocks;
@@ -333,7 +315,7 @@ static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id)
}
static struct dm_zone *dmz_insert(struct dmz_metadata *zmd,
- unsigned int zone_id)
+ unsigned int zone_id, struct dmz_dev *dev)
{
struct dm_zone *zone = kzalloc(sizeof(struct dm_zone), GFP_KERNEL);
@@ -347,6 +329,7 @@ static struct dm_zone *dmz_insert(struct dmz_metadata *zmd,
atomic_set(&zone->refcount, 0);
zone->id = zone_id;
zone->chunk = DMZ_MAP_UNMAPPED;
+ zone->dev = dev;
return zone;
}
@@ -1271,7 +1254,7 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
/* Read and check the primary super block */
zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
- zmd->sb[0].dev = dmz_zone_to_dev(zmd, zmd->sb[0].zone);
+ zmd->sb[0].dev = zmd->sb[0].zone->dev;
ret = dmz_get_sb(zmd, &zmd->sb[0], 0);
if (ret) {
dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed");
@@ -1391,7 +1374,7 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
int idx = num + dev->zone_offset;
struct dm_zone *zone;
- zone = dmz_insert(zmd, idx);
+ zone = dmz_insert(zmd, idx, dev);
if (IS_ERR(zone))
return PTR_ERR(zone);
@@ -1455,7 +1438,7 @@ static int dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev)
for(idx = 0; idx < dev->nr_zones; idx++) {
struct dm_zone *zone;
- zone = dmz_insert(zmd, idx);
+ zone = dmz_insert(zmd, idx, dev);
if (IS_ERR(zone))
return PTR_ERR(zone);
set_bit(DMZ_CACHE, &zone->flags);
@@ -1581,7 +1564,7 @@ static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx,
*/
static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
{
- struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
+ struct dmz_dev *dev = zone->dev;
unsigned int noio_flag;
int ret;
@@ -1618,7 +1601,7 @@ static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
static int dmz_handle_seq_write_err(struct dmz_metadata *zmd,
struct dm_zone *zone)
{
- struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
+ struct dmz_dev *dev = zone->dev;
unsigned int wp = 0;
int ret;
@@ -1655,7 +1638,7 @@ static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
return 0;
if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) {
- struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
+ struct dmz_dev *dev = zone->dev;
ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET,
dmz_start_sect(zmd, zone),
@@ -2216,9 +2199,7 @@ struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags)
goto again;
}
if (dmz_is_meta(zone)) {
- struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
-
- dmz_dev_warn(dev, "Zone %u has metadata", zone->id);
+ dmz_zmd_warn(zmd, "Zone %u has metadata", zone->id);
zone = NULL;
goto again;
}
diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
index fd4d47dfcea1..e9e3b730e258 100644
--- a/drivers/md/dm-zoned-reclaim.c
+++ b/drivers/md/dm-zoned-reclaim.c
@@ -58,7 +58,7 @@ static int dmz_reclaim_align_wp(struct dmz_reclaim *zrc, struct dm_zone *zone,
sector_t block)
{
struct dmz_metadata *zmd = zrc->metadata;
- struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
+ struct dmz_dev *dev = zone->dev;
sector_t wp_block = zone->wp_block;
unsigned int nr_blocks;
int ret;
@@ -116,7 +116,6 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
struct dm_zone *src_zone, struct dm_zone *dst_zone)
{
struct dmz_metadata *zmd = zrc->metadata;
- struct dmz_dev *src_dev, *dst_dev;
struct dm_io_region src, dst;
sector_t block = 0, end_block;
sector_t nr_blocks;
@@ -130,17 +129,15 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
else
end_block = dmz_zone_nr_blocks(zmd);
src_zone_block = dmz_start_block(zmd, src_zone);
- src_dev = dmz_zone_to_dev(zmd, src_zone);
dst_zone_block = dmz_start_block(zmd, dst_zone);
- dst_dev = dmz_zone_to_dev(zmd, dst_zone);
if (dmz_is_seq(dst_zone))
set_bit(DM_KCOPYD_WRITE_SEQ, &flags);
while (block < end_block) {
- if (src_dev->flags & DMZ_BDEV_DYING)
+ if (src_zone->dev->flags & DMZ_BDEV_DYING)
return -EIO;
- if (dst_dev->flags & DMZ_BDEV_DYING)
+ if (dst_zone->dev->flags & DMZ_BDEV_DYING)
return -EIO;
if (dmz_reclaim_should_terminate(src_zone))
@@ -163,11 +160,11 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
return ret;
}
- src.bdev = src_dev->bdev;
+ src.bdev = src_zone->dev->bdev;
src.sector = dmz_blk2sect(src_zone_block + block);
src.count = dmz_blk2sect(nr_blocks);
- dst.bdev = dst_dev->bdev;
+ dst.bdev = dst_zone->dev->bdev;
dst.sector = dmz_blk2sect(dst_zone_block + block);
dst.count = src.count;
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index 2770e293a97b..087dd4801663 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -123,7 +123,7 @@ static int dmz_submit_bio(struct dmz_target *dmz, struct dm_zone *zone,
{
struct dmz_bioctx *bioctx =
dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
- struct dmz_dev *dev = dmz_zone_to_dev(dmz->metadata, zone);
+ struct dmz_dev *dev = zone->dev;
struct bio *clone;
if (dev->flags & DMZ_BDEV_DYING)
diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
index 3451b5a768b4..316344bf07bd 100644
--- a/drivers/md/dm-zoned.h
+++ b/drivers/md/dm-zoned.h
@@ -80,6 +80,9 @@ struct dm_zone {
/* For listing the zone depending on its state */
struct list_head link;
+ /* Device containing this zone */
+ struct dmz_dev *dev;
+
/* Zone type and state */
unsigned long flags;
@@ -190,7 +193,6 @@ const char *dmz_metadata_label(struct dmz_metadata *zmd);
sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone);
sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone);
unsigned int dmz_nr_chunks(struct dmz_metadata *zmd);
-struct dmz_dev *dmz_zone_to_dev(struct dmz_metadata *zmd, struct dm_zone *zone);
bool dmz_check_dev(struct dmz_metadata *zmd);
bool dmz_dev_is_dying(struct dmz_metadata *zmd);
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 08/15] dm-zoned: add metadata pointer to struct dmz_dev
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (6 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 07/15] dm-zoned: add device pointer to struct dm_zone Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 09/15] dm-zoned: per-device reclaim Hannes Reinecke
` (7 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
Add a metadata pointer to struct dmz_dev and use it as argument
for blkdev_report_zones() instead of the metadata itself.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 14 +++++++++-----
drivers/md/dm-zoned.h | 7 ++++---
2 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 45d6e96cb9a8..e22db3f19422 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1369,8 +1369,8 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
*/
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];
+ struct dmz_dev *dev = data;
+ struct dmz_metadata *zmd = dev->metadata;
int idx = num + dev->zone_offset;
struct dm_zone *zone;
@@ -1493,8 +1493,12 @@ static int dmz_init_zones(struct dmz_metadata *zmd)
/* Allocate zone array */
zmd->nr_zones = 0;
- for (i = 0; i < zmd->nr_devs; i++)
- zmd->nr_zones += zmd->dev[i].nr_zones;
+ for (i = 0; i < zmd->nr_devs; i++) {
+ struct dmz_dev *dev = &zmd->dev[i];
+
+ dev->metadata = zmd;
+ zmd->nr_zones += dev->nr_zones;
+ }
if (!zmd->nr_zones) {
DMERR("(%s): No zones found", zmd->devname);
@@ -1529,7 +1533,7 @@ static int dmz_init_zones(struct dmz_metadata *zmd)
* first randomly writable zone.
*/
ret = blkdev_report_zones(zoned_dev->bdev, 0, BLK_ALL_ZONES,
- dmz_init_zone, zmd);
+ dmz_init_zone, zoned_dev);
if (ret < 0) {
DMDEBUG("(%s): Failed to report zones, error %d",
zmd->devname, ret);
diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
index 316344bf07bd..983f5b5e9fa0 100644
--- a/drivers/md/dm-zoned.h
+++ b/drivers/md/dm-zoned.h
@@ -45,11 +45,15 @@
#define dmz_bio_block(bio) dmz_sect2blk((bio)->bi_iter.bi_sector)
#define dmz_bio_blocks(bio) dmz_sect2blk(bio_sectors(bio))
+struct dmz_metadata;
+struct dmz_reclaim;
+
/*
* Zoned block device information.
*/
struct dmz_dev {
struct block_device *bdev;
+ struct dmz_metadata *metadata;
char name[BDEVNAME_SIZE];
uuid_t uuid;
@@ -170,9 +174,6 @@ enum {
#define dmz_dev_debug(dev, format, args...) \
DMDEBUG("(%s): " format, (dev)->name, ## args)
-struct dmz_metadata;
-struct dmz_reclaim;
-
/*
* Functions defined in dm-zoned-metadata.c
*/
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 09/15] dm-zoned: per-device reclaim
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (7 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 08/15] dm-zoned: add metadata pointer to struct dmz_dev Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 10/15] dm-zoned: move random and sequential zones into struct dmz_dev Hannes Reinecke
` (6 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
Instead of having one reclaim workqueue for the entire set we should
be allocating a reclaim workqueue per device; that will reduce
contention and should boost performance for a multi-device setup.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-reclaim.c | 66 +++++++++++++++++++++++++++----------------
drivers/md/dm-zoned-target.c | 41 +++++++++++++++++----------
drivers/md/dm-zoned.h | 38 +++++++++++++------------
3 files changed, 88 insertions(+), 57 deletions(-)
diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
index e9e3b730e258..09843645248a 100644
--- a/drivers/md/dm-zoned-reclaim.c
+++ b/drivers/md/dm-zoned-reclaim.c
@@ -21,6 +21,8 @@ struct dmz_reclaim {
struct dm_kcopyd_throttle kc_throttle;
int kc_err;
+ int dev_idx;
+
unsigned long flags;
/* Last target access time */
@@ -198,8 +200,8 @@ static int dmz_reclaim_buf(struct dmz_reclaim *zrc, struct dm_zone *dzone)
struct dmz_metadata *zmd = zrc->metadata;
int ret;
- DMDEBUG("(%s): Chunk %u, move buf zone %u (weight %u) to data zone %u (weight %u)",
- dmz_metadata_label(zmd),
+ DMDEBUG("(%s/%u): Chunk %u, move buf zone %u (weight %u) to data zone %u (weight %u)",
+ dmz_metadata_label(zmd), zrc->dev_idx,
dzone->chunk, bzone->id, dmz_weight(bzone),
dzone->id, dmz_weight(dzone));
@@ -237,8 +239,8 @@ static int dmz_reclaim_seq_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
struct dmz_metadata *zmd = zrc->metadata;
int ret = 0;
- DMDEBUG("(%s): Chunk %u, move data zone %u (weight %u) to buf zone %u (weight %u)",
- dmz_metadata_label(zmd),
+ DMDEBUG("(%s/%u): Chunk %u, move data zone %u (weight %u) to buf zone %u (weight %u)",
+ dmz_metadata_label(zmd), zrc->dev_idx,
chunk, dzone->id, dmz_weight(dzone),
bzone->id, dmz_weight(bzone));
@@ -295,8 +297,8 @@ static int dmz_reclaim_rnd_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
if (!szone)
return -ENOSPC;
- DMDEBUG("(%s): Chunk %u, move %s zone %u (weight %u) to %s zone %u",
- dmz_metadata_label(zmd), chunk,
+ DMDEBUG("(%s/%u): Chunk %u, move %s zone %u (weight %u) to %s zone %u",
+ dmz_metadata_label(zmd), zrc->dev_idx, chunk,
dmz_is_cache(dzone) ? "cache" : "rnd",
dzone->id, dmz_weight(dzone),
dmz_is_rnd(szone) ? "rnd" : "seq", szone->id);
@@ -369,8 +371,8 @@ static int dmz_do_reclaim(struct dmz_reclaim *zrc)
/* Get a data zone */
dzone = dmz_get_zone_for_reclaim(zmd, dmz_target_idle(zrc));
if (!dzone) {
- DMDEBUG("(%s): No zone found to reclaim",
- dmz_metadata_label(zmd));
+ DMDEBUG("(%s/%u): No zone found to reclaim",
+ dmz_metadata_label(zmd), zrc->dev_idx);
return -EBUSY;
}
@@ -417,24 +419,26 @@ static int dmz_do_reclaim(struct dmz_reclaim *zrc)
out:
if (ret) {
if (ret == -EINTR)
- DMDEBUG("(%s): reclaim zone %u interrupted",
- dmz_metadata_label(zmd), rzone->id);
+ DMDEBUG("(%s/%u): reclaim zone %u interrupted",
+ dmz_metadata_label(zmd), zrc->dev_idx,
+ rzone->id);
else
- DMDEBUG("(%s): Failed to reclaim zone %u, err %d",
- dmz_metadata_label(zmd), rzone->id, ret);
+ DMDEBUG("(%s/%u): Failed to reclaim zone %u, err %d",
+ dmz_metadata_label(zmd), zrc->dev_idx,
+ rzone->id, ret);
dmz_unlock_zone_reclaim(dzone);
return ret;
}
ret = dmz_flush_metadata(zrc->metadata);
if (ret) {
- DMDEBUG("(%s): Metadata flush for zone %u failed, err %d",
- dmz_metadata_label(zmd), rzone->id, ret);
+ DMDEBUG("(%s/%u): Metadata flush for zone %u failed, err %d",
+ dmz_metadata_label(zmd), zrc->dev_idx, rzone->id, ret);
return ret;
}
- DMDEBUG("(%s): Reclaimed zone %u in %u ms",
- dmz_metadata_label(zmd),
+ DMDEBUG("(%s/%u): Reclaimed zone %u in %u ms",
+ dmz_metadata_label(zmd), zrc->dev_idx,
rzone->id, jiffies_to_msecs(jiffies - start));
return 0;
}
@@ -461,10 +465,20 @@ static unsigned int dmz_reclaim_percentage(struct dmz_reclaim *zrc)
*/
static bool dmz_should_reclaim(struct dmz_reclaim *zrc, unsigned int p_unmap)
{
- unsigned int nr_reclaim = dmz_nr_rnd_zones(zrc->metadata);
+ unsigned int nr_reclaim;
+
+ nr_reclaim = dmz_nr_rnd_zones(zrc->metadata);
- if (dmz_nr_cache_zones(zrc->metadata))
+ if (dmz_nr_cache_zones(zrc->metadata)) {
+ /*
+ * The first device in a multi-device
+ * setup only contains cache zones, so
+ * never start reclaim there.
+ */
+ if (zrc->dev_idx == 0)
+ return false;
nr_reclaim += dmz_nr_cache_zones(zrc->metadata);
+ }
/* Reclaim when idle */
if (dmz_target_idle(zrc) && nr_reclaim)
@@ -488,7 +502,7 @@ static void dmz_reclaim_work(struct work_struct *work)
{
struct dmz_reclaim *zrc = container_of(work, struct dmz_reclaim, work.work);
struct dmz_metadata *zmd = zrc->metadata;
- unsigned int p_unmap;
+ unsigned int p_unmap, nr_unmap_rnd = 0, nr_rnd = 0;
int ret;
if (dmz_dev_is_dying(zmd))
@@ -514,8 +528,11 @@ static void dmz_reclaim_work(struct work_struct *work)
zrc->kc_throttle.throttle = min(75U, 100U - p_unmap / 2);
}
- DMDEBUG("(%s): Reclaim (%u): %s, %u%% free zones (%u/%u cache %u/%u random)",
- dmz_metadata_label(zmd),
+ nr_unmap_rnd = dmz_nr_unmap_rnd_zones(zmd);
+ nr_rnd = dmz_nr_rnd_zones(zmd);
+
+ DMDEBUG("(%s/%u): Reclaim (%u): %s, %u%% free zones (%u/%u cache %u/%u random)",
+ dmz_metadata_label(zmd), zrc->dev_idx,
zrc->kc_throttle.throttle,
(dmz_target_idle(zrc) ? "Idle" : "Busy"),
p_unmap, dmz_nr_unmap_cache_zones(zmd),
@@ -536,7 +553,7 @@ static void dmz_reclaim_work(struct work_struct *work)
* Initialize reclaim.
*/
int dmz_ctr_reclaim(struct dmz_metadata *zmd,
- struct dmz_reclaim **reclaim)
+ struct dmz_reclaim **reclaim, int idx)
{
struct dmz_reclaim *zrc;
int ret;
@@ -547,6 +564,7 @@ int dmz_ctr_reclaim(struct dmz_metadata *zmd,
zrc->metadata = zmd;
zrc->atime = jiffies;
+ zrc->dev_idx = idx;
/* Reclaim kcopyd client */
zrc->kc = dm_kcopyd_client_create(&zrc->kc_throttle);
@@ -558,8 +576,8 @@ int dmz_ctr_reclaim(struct dmz_metadata *zmd,
/* Reclaim work */
INIT_DELAYED_WORK(&zrc->work, dmz_reclaim_work);
- zrc->wq = alloc_ordered_workqueue("dmz_rwq_%s", WQ_MEM_RECLAIM,
- dmz_metadata_label(zmd));
+ zrc->wq = alloc_ordered_workqueue("dmz_rwq_%s_%d", WQ_MEM_RECLAIM,
+ dmz_metadata_label(zmd), idx);
if (!zrc->wq) {
ret = -ENOMEM;
goto err;
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index 087dd4801663..97d63d8e6c19 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -41,6 +41,7 @@ struct dm_chunk_work {
*/
struct dmz_target {
struct dm_dev *ddev[DMZ_MAX_DEVS];
+ unsigned int nr_ddevs;
unsigned long flags;
@@ -50,9 +51,6 @@ struct dmz_target {
/* For metadata handling */
struct dmz_metadata *metadata;
- /* For reclaim */
- struct dmz_reclaim *reclaim;
-
/* For chunk work */
struct radix_tree_root chunk_rxtree;
struct workqueue_struct *chunk_wq;
@@ -404,14 +402,15 @@ static void dmz_handle_bio(struct dmz_target *dmz, struct dm_chunk_work *cw,
dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
struct dmz_metadata *zmd = dmz->metadata;
struct dm_zone *zone;
- int ret;
+ int i, ret;
/*
* Write may trigger a zone allocation. So make sure the
* allocation can succeed.
*/
if (bio_op(bio) == REQ_OP_WRITE)
- dmz_schedule_reclaim(dmz->reclaim);
+ for (i = 0; i < dmz->nr_ddevs; i++)
+ dmz_schedule_reclaim(dmz->dev[i].reclaim);
dmz_lock_metadata(zmd);
@@ -431,6 +430,7 @@ static void dmz_handle_bio(struct dmz_target *dmz, struct dm_chunk_work *cw,
if (zone) {
dmz_activate_zone(zone);
bioctx->zone = zone;
+ dmz_reclaim_bio_acc(zone->dev->reclaim);
}
switch (bio_op(bio)) {
@@ -577,7 +577,6 @@ static int dmz_queue_chunk_work(struct dmz_target *dmz, struct bio *bio)
bio_list_add(&cw->bio_list, bio);
- dmz_reclaim_bio_acc(dmz->reclaim);
if (queue_work(dmz->chunk_wq, &cw->work))
dmz_get_chunk_work(cw);
out:
@@ -822,7 +821,7 @@ static int dmz_fixup_devices(struct dm_target *ti)
static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct dmz_target *dmz;
- int ret;
+ int ret, i;
/* Check arguments */
if (argc < 1 || argc > 2) {
@@ -842,6 +841,7 @@ static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
kfree(dmz);
return -ENOMEM;
}
+ dmz->nr_ddevs = argc;
ti->private = dmz;
/* Get the target zoned block device */
@@ -916,10 +916,12 @@ static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
mod_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
/* Initialize reclaim */
- ret = dmz_ctr_reclaim(dmz->metadata, &dmz->reclaim);
- if (ret) {
- ti->error = "Zone reclaim initialization failed";
- goto err_fwq;
+ for (i = 0; i < dmz->nr_ddevs; i++) {
+ ret = dmz_ctr_reclaim(dmz->metadata, &dmz->dev[i].reclaim, i);
+ if (ret) {
+ ti->error = "Zone reclaim initialization failed";
+ goto err_fwq;
+ }
}
DMINFO("(%s): Target device: %llu 512-byte logical sectors (%llu blocks)",
@@ -952,11 +954,13 @@ static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
static void dmz_dtr(struct dm_target *ti)
{
struct dmz_target *dmz = ti->private;
+ int i;
flush_workqueue(dmz->chunk_wq);
destroy_workqueue(dmz->chunk_wq);
- dmz_dtr_reclaim(dmz->reclaim);
+ for (i = 0; i < dmz->nr_ddevs; i++)
+ dmz_dtr_reclaim(dmz->dev[i].reclaim);
cancel_delayed_work_sync(&dmz->flush_work);
destroy_workqueue(dmz->flush_wq);
@@ -1025,9 +1029,11 @@ static int dmz_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
static void dmz_suspend(struct dm_target *ti)
{
struct dmz_target *dmz = ti->private;
+ int i;
flush_workqueue(dmz->chunk_wq);
- dmz_suspend_reclaim(dmz->reclaim);
+ for (i = 0; i < dmz->nr_ddevs; i++)
+ dmz_suspend_reclaim(dmz->dev[i].reclaim);
cancel_delayed_work_sync(&dmz->flush_work);
}
@@ -1037,9 +1043,11 @@ static void dmz_suspend(struct dm_target *ti)
static void dmz_resume(struct dm_target *ti)
{
struct dmz_target *dmz = ti->private;
+ int i;
queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
- dmz_resume_reclaim(dmz->reclaim);
+ for (i = 0; i < dmz->nr_ddevs; i++)
+ dmz_resume_reclaim(dmz->dev[i].reclaim);
}
static int dmz_iterate_devices(struct dm_target *ti,
@@ -1100,7 +1108,10 @@ static int dmz_message(struct dm_target *ti, unsigned int argc, char **argv,
int r = -EINVAL;
if (!strcasecmp(argv[0], "reclaim")) {
- dmz_schedule_reclaim(dmz->reclaim);
+ int i;
+
+ for (i = 0; i < dmz->nr_ddevs; i++)
+ dmz_schedule_reclaim(dmz->dev[i].reclaim);
r = 0;
} else
DMERR("unrecognized message %s", argv[0]);
diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
index 983f5b5e9fa0..0cc3459f78ce 100644
--- a/drivers/md/dm-zoned.h
+++ b/drivers/md/dm-zoned.h
@@ -54,6 +54,7 @@ struct dmz_reclaim;
struct dmz_dev {
struct block_device *bdev;
struct dmz_metadata *metadata;
+ struct dmz_reclaim *reclaim;
char name[BDEVNAME_SIZE];
uuid_t uuid;
@@ -229,23 +230,6 @@ static inline void dmz_activate_zone(struct dm_zone *zone)
atomic_inc(&zone->refcount);
}
-/*
- * Deactivate a zone. This decrement the zone reference counter
- * indicating that all BIOs to the zone have completed when the count is 0.
- */
-static inline void dmz_deactivate_zone(struct dm_zone *zone)
-{
- atomic_dec(&zone->refcount);
-}
-
-/*
- * Test if a zone is active, that is, has a refcount > 0.
- */
-static inline bool dmz_is_active(struct dm_zone *zone)
-{
- return atomic_read(&zone->refcount);
-}
-
int dmz_lock_zone_reclaim(struct dm_zone *zone);
void dmz_unlock_zone_reclaim(struct dm_zone *zone);
struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd, bool idle);
@@ -272,7 +256,7 @@ int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
/*
* Functions defined in dm-zoned-reclaim.c
*/
-int dmz_ctr_reclaim(struct dmz_metadata *zmd, struct dmz_reclaim **zrc);
+int dmz_ctr_reclaim(struct dmz_metadata *zmd, struct dmz_reclaim **zrc, int idx);
void dmz_dtr_reclaim(struct dmz_reclaim *zrc);
void dmz_suspend_reclaim(struct dmz_reclaim *zrc);
void dmz_resume_reclaim(struct dmz_reclaim *zrc);
@@ -285,4 +269,22 @@ void dmz_schedule_reclaim(struct dmz_reclaim *zrc);
bool dmz_bdev_is_dying(struct dmz_dev *dmz_dev);
bool dmz_check_bdev(struct dmz_dev *dmz_dev);
+/*
+ * Deactivate a zone. This decrement the zone reference counter
+ * indicating that all BIOs to the zone have completed when the count is 0.
+ */
+static inline void dmz_deactivate_zone(struct dm_zone *zone)
+{
+ dmz_reclaim_bio_acc(zone->dev->reclaim);
+ atomic_dec(&zone->refcount);
+}
+
+/*
+ * Test if a zone is active, that is, has a refcount > 0.
+ */
+static inline bool dmz_is_active(struct dm_zone *zone)
+{
+ return atomic_read(&zone->refcount);
+}
+
#endif /* DM_ZONED_H */
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 10/15] dm-zoned: move random and sequential zones into struct dmz_dev
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (8 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 09/15] dm-zoned: per-device reclaim Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 11/15] dm-zoned: support arbitrary number of devices Hannes Reinecke
` (5 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
Random and sequential zones should be part of the respective
device structure to make arbitration between devices possible.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 139 +++++++++++++++++++++++------------------
drivers/md/dm-zoned-reclaim.c | 15 +++--
drivers/md/dm-zoned-target.c | 25 ++++++--
drivers/md/dm-zoned.h | 18 ++++--
4 files changed, 119 insertions(+), 78 deletions(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index e22db3f19422..044c152eb756 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -192,21 +192,12 @@ struct dmz_metadata {
/* Zone allocation management */
struct mutex map_lock;
struct dmz_mblock **map_mblk;
- unsigned int nr_rnd;
- atomic_t unmap_nr_rnd;
- struct list_head unmap_rnd_list;
- struct list_head map_rnd_list;
unsigned int nr_cache;
atomic_t unmap_nr_cache;
struct list_head unmap_cache_list;
struct list_head map_cache_list;
- unsigned int nr_seq;
- atomic_t unmap_nr_seq;
- struct list_head unmap_seq_list;
- struct list_head map_seq_list;
-
atomic_t nr_reserved_seq_zones;
struct list_head reserved_seq_zones_list;
@@ -279,14 +270,14 @@ unsigned int dmz_nr_chunks(struct dmz_metadata *zmd)
return zmd->nr_chunks;
}
-unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd)
+unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd, int idx)
{
- return zmd->nr_rnd;
+ return zmd->dev[idx].nr_rnd;
}
-unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd)
+unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd, int idx)
{
- return atomic_read(&zmd->unmap_nr_rnd);
+ return atomic_read(&zmd->dev[idx].unmap_nr_rnd);
}
unsigned int dmz_nr_cache_zones(struct dmz_metadata *zmd)
@@ -299,14 +290,14 @@ unsigned int dmz_nr_unmap_cache_zones(struct dmz_metadata *zmd)
return atomic_read(&zmd->unmap_nr_cache);
}
-unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd)
+unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd, int idx)
{
- return zmd->nr_seq;
+ return zmd->dev[idx].nr_seq;
}
-unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd)
+unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd, int idx)
{
- return atomic_read(&zmd->unmap_nr_seq);
+ return atomic_read(&zmd->dev[idx].unmap_nr_seq);
}
static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id)
@@ -1498,6 +1489,14 @@ static int dmz_init_zones(struct dmz_metadata *zmd)
dev->metadata = zmd;
zmd->nr_zones += dev->nr_zones;
+
+ atomic_set(&dev->unmap_nr_rnd, 0);
+ INIT_LIST_HEAD(&dev->unmap_rnd_list);
+ INIT_LIST_HEAD(&dev->map_rnd_list);
+
+ atomic_set(&dev->unmap_nr_seq, 0);
+ INIT_LIST_HEAD(&dev->unmap_seq_list);
+ INIT_LIST_HEAD(&dev->map_seq_list);
}
if (!zmd->nr_zones) {
@@ -1718,9 +1717,9 @@ static int dmz_load_mapping(struct dmz_metadata *zmd)
if (dmz_is_cache(dzone))
list_add_tail(&dzone->link, &zmd->map_cache_list);
else if (dmz_is_rnd(dzone))
- list_add_tail(&dzone->link, &zmd->map_rnd_list);
+ list_add_tail(&dzone->link, &dzone->dev->map_rnd_list);
else
- list_add_tail(&dzone->link, &zmd->map_seq_list);
+ list_add_tail(&dzone->link, &dzone->dev->map_seq_list);
/* Check buffer zone */
bzone_id = le32_to_cpu(dmap[e].bzone_id);
@@ -1754,7 +1753,7 @@ static int dmz_load_mapping(struct dmz_metadata *zmd)
if (dmz_is_cache(bzone))
list_add_tail(&bzone->link, &zmd->map_cache_list);
else
- list_add_tail(&bzone->link, &zmd->map_rnd_list);
+ list_add_tail(&bzone->link, &bzone->dev->map_rnd_list);
next:
chunk++;
e++;
@@ -1779,9 +1778,9 @@ static int dmz_load_mapping(struct dmz_metadata *zmd)
if (dmz_is_cache(dzone))
zmd->nr_cache++;
else if (dmz_is_rnd(dzone))
- zmd->nr_rnd++;
+ dzone->dev->nr_rnd++;
else
- zmd->nr_seq++;
+ dzone->dev->nr_seq++;
if (dmz_is_data(dzone)) {
/* Already initialized */
@@ -1795,16 +1794,18 @@ static int dmz_load_mapping(struct dmz_metadata *zmd)
list_add_tail(&dzone->link, &zmd->unmap_cache_list);
atomic_inc(&zmd->unmap_nr_cache);
} else if (dmz_is_rnd(dzone)) {
- list_add_tail(&dzone->link, &zmd->unmap_rnd_list);
- atomic_inc(&zmd->unmap_nr_rnd);
+ list_add_tail(&dzone->link,
+ &dzone->dev->unmap_rnd_list);
+ atomic_inc(&dzone->dev->unmap_nr_rnd);
} else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) {
list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list);
set_bit(DMZ_RESERVED, &dzone->flags);
atomic_inc(&zmd->nr_reserved_seq_zones);
- zmd->nr_seq--;
+ dzone->dev->nr_seq--;
} else {
- list_add_tail(&dzone->link, &zmd->unmap_seq_list);
- atomic_inc(&zmd->unmap_nr_seq);
+ list_add_tail(&dzone->link,
+ &dzone->dev->unmap_seq_list);
+ atomic_inc(&dzone->dev->unmap_nr_seq);
}
}
@@ -1838,13 +1839,13 @@ static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
list_del_init(&zone->link);
if (dmz_is_seq(zone)) {
/* LRU rotate sequential zone */
- list_add_tail(&zone->link, &zmd->map_seq_list);
+ list_add_tail(&zone->link, &zone->dev->map_seq_list);
} else if (dmz_is_cache(zone)) {
/* LRU rotate cache zone */
list_add_tail(&zone->link, &zmd->map_cache_list);
} else {
/* LRU rotate random zone */
- list_add_tail(&zone->link, &zmd->map_rnd_list);
+ list_add_tail(&zone->link, &zone->dev->map_rnd_list);
}
}
@@ -1926,14 +1927,24 @@ static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
{
struct dm_zone *dzone = NULL;
struct dm_zone *zone;
- struct list_head *zone_list = &zmd->map_rnd_list;
+ struct list_head *zone_list;
/* If we have cache zones select from the cache zone list */
if (zmd->nr_cache) {
zone_list = &zmd->map_cache_list;
/* Try to relaim random zones, too, when idle */
- if (idle && list_empty(zone_list))
- zone_list = &zmd->map_rnd_list;
+ if (idle && list_empty(zone_list)) {
+ int i;
+
+ for (i = 1; i < zmd->nr_devs; i++) {
+ zone_list = &zmd->dev[i].map_rnd_list;
+ if (!list_empty(zone_list))
+ break;
+ }
+ }
+ } else {
+ /* Otherwise the random zones are on the first disk */
+ zone_list = &zmd->dev[0].map_rnd_list;
}
list_for_each_entry(zone, zone_list, link) {
@@ -1954,12 +1965,17 @@ static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd)
{
struct dm_zone *zone;
+ int i;
- list_for_each_entry(zone, &zmd->map_seq_list, link) {
- if (!zone->bzone)
- continue;
- if (dmz_lock_zone_reclaim(zone))
- return zone;
+ for (i = 0; i < zmd->nr_devs; i++) {
+ struct dmz_dev *dev = &zmd->dev[i];
+
+ list_for_each_entry(zone, &dev->map_seq_list, link) {
+ if (!zone->bzone)
+ continue;
+ if (dmz_lock_zone_reclaim(zone))
+ return zone;
+ }
}
return NULL;
@@ -2145,7 +2161,7 @@ struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
if (dmz_is_cache(bzone))
list_add_tail(&bzone->link, &zmd->map_cache_list);
else
- list_add_tail(&bzone->link, &zmd->map_rnd_list);
+ list_add_tail(&bzone->link, &bzone->dev->map_rnd_list);
out:
dmz_unlock_map(zmd);
@@ -2160,21 +2176,27 @@ struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags)
{
struct list_head *list;
struct dm_zone *zone;
+ unsigned int dev_idx = 0;
+again:
if (flags & DMZ_ALLOC_CACHE)
list = &zmd->unmap_cache_list;
else if (flags & DMZ_ALLOC_RND)
- list = &zmd->unmap_rnd_list;
+ list = &zmd->dev[dev_idx].unmap_rnd_list;
else
- list = &zmd->unmap_seq_list;
+ list = &zmd->dev[dev_idx].unmap_seq_list;
-again:
if (list_empty(list)) {
/*
* No free zone: return NULL if this is for not reclaim.
*/
if (!(flags & DMZ_ALLOC_RECLAIM))
return NULL;
+ if (dev_idx < zmd->nr_devs) {
+ dev_idx++;
+ goto again;
+ }
+
/*
* Fallback to the reserved sequential zones
*/
@@ -2193,9 +2215,9 @@ struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags)
if (dmz_is_cache(zone))
atomic_dec(&zmd->unmap_nr_cache);
else if (dmz_is_rnd(zone))
- atomic_dec(&zmd->unmap_nr_rnd);
+ atomic_dec(&zone->dev->unmap_nr_rnd);
else
- atomic_dec(&zmd->unmap_nr_seq);
+ atomic_dec(&zone->dev->unmap_nr_seq);
if (dmz_is_offline(zone)) {
dmz_zmd_warn(zmd, "Zone %u is offline", zone->id);
@@ -2225,14 +2247,14 @@ void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
list_add_tail(&zone->link, &zmd->unmap_cache_list);
atomic_inc(&zmd->unmap_nr_cache);
} else if (dmz_is_rnd(zone)) {
- list_add_tail(&zone->link, &zmd->unmap_rnd_list);
- atomic_inc(&zmd->unmap_nr_rnd);
+ list_add_tail(&zone->link, &zone->dev->unmap_rnd_list);
+ atomic_inc(&zone->dev->unmap_nr_rnd);
} else if (dmz_is_reserved(zone)) {
list_add_tail(&zone->link, &zmd->reserved_seq_zones_list);
atomic_inc(&zmd->nr_reserved_seq_zones);
} else {
- list_add_tail(&zone->link, &zmd->unmap_seq_list);
- atomic_inc(&zmd->unmap_nr_seq);
+ list_add_tail(&zone->link, &zone->dev->unmap_seq_list);
+ atomic_inc(&zone->dev->unmap_nr_seq);
}
wake_up_all(&zmd->free_wq);
@@ -2252,9 +2274,9 @@ void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone,
if (dmz_is_cache(dzone))
list_add_tail(&dzone->link, &zmd->map_cache_list);
else if (dmz_is_rnd(dzone))
- list_add_tail(&dzone->link, &zmd->map_rnd_list);
+ list_add_tail(&dzone->link, &dzone->dev->map_rnd_list);
else
- list_add_tail(&dzone->link, &zmd->map_seq_list);
+ list_add_tail(&dzone->link, &dzone->dev->map_seq_list);
}
/*
@@ -2822,18 +2844,11 @@ int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
INIT_LIST_HEAD(&zmd->mblk_dirty_list);
mutex_init(&zmd->map_lock);
- atomic_set(&zmd->unmap_nr_rnd, 0);
- INIT_LIST_HEAD(&zmd->unmap_rnd_list);
- INIT_LIST_HEAD(&zmd->map_rnd_list);
atomic_set(&zmd->unmap_nr_cache, 0);
INIT_LIST_HEAD(&zmd->unmap_cache_list);
INIT_LIST_HEAD(&zmd->map_cache_list);
- atomic_set(&zmd->unmap_nr_seq, 0);
- INIT_LIST_HEAD(&zmd->unmap_seq_list);
- INIT_LIST_HEAD(&zmd->map_seq_list);
-
atomic_set(&zmd->nr_reserved_seq_zones, 0);
INIT_LIST_HEAD(&zmd->reserved_seq_zones_list);
@@ -2902,10 +2917,14 @@ int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
zmd->nr_data_zones, zmd->nr_chunks);
dmz_zmd_debug(zmd, " %u cache zones (%u unmapped)",
zmd->nr_cache, atomic_read(&zmd->unmap_nr_cache));
- dmz_zmd_debug(zmd, " %u random zones (%u unmapped)",
- zmd->nr_rnd, atomic_read(&zmd->unmap_nr_rnd));
- dmz_zmd_debug(zmd, " %u sequential zones (%u unmapped)",
- zmd->nr_seq, atomic_read(&zmd->unmap_nr_seq));
+ for (i = 0; i < zmd->nr_devs; i++) {
+ dmz_zmd_debug(zmd, " %u random zones (%u unmapped)",
+ dmz_nr_rnd_zones(zmd, i),
+ dmz_nr_unmap_rnd_zones(zmd, i));
+ dmz_zmd_debug(zmd, " %u sequential zones (%u unmapped)",
+ dmz_nr_seq_zones(zmd, i),
+ dmz_nr_unmap_seq_zones(zmd, i));
+ }
dmz_zmd_debug(zmd, " %u reserved sequential data zones",
zmd->nr_reserved_seq);
dmz_zmd_debug(zmd, "Format:");
diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
index 09843645248a..18edf1b9bf52 100644
--- a/drivers/md/dm-zoned-reclaim.c
+++ b/drivers/md/dm-zoned-reclaim.c
@@ -447,15 +447,14 @@ static unsigned int dmz_reclaim_percentage(struct dmz_reclaim *zrc)
{
struct dmz_metadata *zmd = zrc->metadata;
unsigned int nr_cache = dmz_nr_cache_zones(zmd);
- unsigned int nr_rnd = dmz_nr_rnd_zones(zmd);
unsigned int nr_unmap, nr_zones;
if (nr_cache) {
nr_zones = nr_cache;
nr_unmap = dmz_nr_unmap_cache_zones(zmd);
} else {
- nr_zones = nr_rnd;
- nr_unmap = dmz_nr_unmap_rnd_zones(zmd);
+ nr_zones = dmz_nr_rnd_zones(zmd, zrc->dev_idx);
+ nr_unmap = dmz_nr_unmap_rnd_zones(zmd, zrc->dev_idx);
}
return nr_unmap * 100 / nr_zones;
}
@@ -467,7 +466,7 @@ static bool dmz_should_reclaim(struct dmz_reclaim *zrc, unsigned int p_unmap)
{
unsigned int nr_reclaim;
- nr_reclaim = dmz_nr_rnd_zones(zrc->metadata);
+ nr_reclaim = dmz_nr_rnd_zones(zrc->metadata, zrc->dev_idx);
if (dmz_nr_cache_zones(zrc->metadata)) {
/*
@@ -528,8 +527,8 @@ static void dmz_reclaim_work(struct work_struct *work)
zrc->kc_throttle.throttle = min(75U, 100U - p_unmap / 2);
}
- nr_unmap_rnd = dmz_nr_unmap_rnd_zones(zmd);
- nr_rnd = dmz_nr_rnd_zones(zmd);
+ nr_unmap_rnd = dmz_nr_unmap_rnd_zones(zmd, zrc->dev_idx);
+ nr_rnd = dmz_nr_rnd_zones(zmd, zrc->dev_idx);
DMDEBUG("(%s/%u): Reclaim (%u): %s, %u%% free zones (%u/%u cache %u/%u random)",
dmz_metadata_label(zmd), zrc->dev_idx,
@@ -537,8 +536,8 @@ static void dmz_reclaim_work(struct work_struct *work)
(dmz_target_idle(zrc) ? "Idle" : "Busy"),
p_unmap, dmz_nr_unmap_cache_zones(zmd),
dmz_nr_cache_zones(zmd),
- dmz_nr_unmap_rnd_zones(zmd),
- dmz_nr_rnd_zones(zmd));
+ dmz_nr_unmap_rnd_zones(zmd, zrc->dev_idx),
+ dmz_nr_rnd_zones(zmd, zrc->dev_idx));
ret = dmz_do_reclaim(zrc);
if (ret && ret != -EINTR) {
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index 97d63d8e6c19..aa3d26d16441 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -1075,17 +1075,30 @@ static void dmz_status(struct dm_target *ti, status_type_t type,
ssize_t sz = 0;
char buf[BDEVNAME_SIZE];
struct dmz_dev *dev;
+ int i;
switch (type) {
case STATUSTYPE_INFO:
- DMEMIT("%u zones %u/%u cache %u/%u random %u/%u sequential",
+ DMEMIT("%u zones %u/%u cache",
dmz_nr_zones(dmz->metadata),
dmz_nr_unmap_cache_zones(dmz->metadata),
- dmz_nr_cache_zones(dmz->metadata),
- dmz_nr_unmap_rnd_zones(dmz->metadata),
- dmz_nr_rnd_zones(dmz->metadata),
- dmz_nr_unmap_seq_zones(dmz->metadata),
- dmz_nr_seq_zones(dmz->metadata));
+ dmz_nr_cache_zones(dmz->metadata));
+ for (i = 0; i < DMZ_MAX_DEVS; i++) {
+ if (!dmz->ddev[i])
+ continue;
+ /*
+ * For a multi-device setup the first device
+ * contains only cache zones.
+ */
+ if ((i == 0) &&
+ (dmz_nr_cache_zones(dmz->metadata) > 0))
+ continue;
+ DMEMIT(" %u/%u random %u/%u sequential",
+ dmz_nr_unmap_rnd_zones(dmz->metadata, i),
+ dmz_nr_rnd_zones(dmz->metadata, i),
+ dmz_nr_unmap_seq_zones(dmz->metadata, i),
+ dmz_nr_seq_zones(dmz->metadata, i));
+ }
break;
case STATUSTYPE_TABLE:
dev = &dmz->dev[0];
diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
index 0cc3459f78ce..f2a760f62db5 100644
--- a/drivers/md/dm-zoned.h
+++ b/drivers/md/dm-zoned.h
@@ -67,6 +67,16 @@ struct dmz_dev {
unsigned int flags;
sector_t zone_nr_sectors;
+
+ unsigned int nr_rnd;
+ atomic_t unmap_nr_rnd;
+ struct list_head unmap_rnd_list;
+ struct list_head map_rnd_list;
+
+ unsigned int nr_seq;
+ atomic_t unmap_nr_seq;
+ struct list_head unmap_seq_list;
+ struct list_head map_seq_list;
};
#define dmz_bio_chunk(zmd, bio) ((bio)->bi_iter.bi_sector >> \
@@ -213,10 +223,10 @@ void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
unsigned int dmz_nr_zones(struct dmz_metadata *zmd);
unsigned int dmz_nr_cache_zones(struct dmz_metadata *zmd);
unsigned int dmz_nr_unmap_cache_zones(struct dmz_metadata *zmd);
-unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd);
-unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd);
-unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd);
-unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd);
+unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd, int idx);
+unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd, int idx);
+unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd, int idx);
+unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd, int idx);
unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd);
unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd);
unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd);
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 11/15] dm-zoned: support arbitrary number of devices
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (9 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 10/15] dm-zoned: move random and sequential zones into struct dmz_dev Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 12/15] dm-zoned: allocate zone by device index Hannes Reinecke
` (4 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
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 <hare@suse.de>
---
drivers/md/dm-zoned-metadata.c | 15 +++++-
drivers/md/dm-zoned-target.c | 106 ++++++++++++++++++++++++-----------------
2 files changed, 75 insertions(+), 46 deletions(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 044c152eb756..221163ae5f68 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1523,7 +1523,20 @@ 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 aa3d26d16441..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
-
/*
* 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);
}
@@ -1133,7 +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,
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 12/15] dm-zoned: allocate zone by device index
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (10 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 11/15] dm-zoned: support arbitrary number of devices Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 13/15] dm-zoned: select reclaim zone based on " Hannes Reinecke
` (3 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
When allocating a zone we should pass in an indicator on which
device the zone should be allocated; this increases performance
for a multi-device setup as then reclaim can allocate zones on
the device for which reclaim is running.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 17 +++++++++++------
drivers/md/dm-zoned-reclaim.c | 3 ++-
drivers/md/dm-zoned.h | 3 ++-
3 files changed, 15 insertions(+), 8 deletions(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 221163ae5f68..7f46b2ea554c 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -2048,7 +2048,7 @@ struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chu
goto out;
/* Allocate a random zone */
- dzone = dmz_alloc_zone(zmd, alloc_flags);
+ dzone = dmz_alloc_zone(zmd, 0, alloc_flags);
if (!dzone) {
if (dmz_dev_is_dying(zmd)) {
dzone = ERR_PTR(-EIO);
@@ -2154,7 +2154,7 @@ struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
goto out;
/* Allocate a random zone */
- bzone = dmz_alloc_zone(zmd, alloc_flags);
+ bzone = dmz_alloc_zone(zmd, 0, alloc_flags);
if (!bzone) {
if (dmz_dev_is_dying(zmd)) {
bzone = ERR_PTR(-EIO);
@@ -2185,11 +2185,12 @@ struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
* Get an unmapped (free) zone.
* This must be called with the mapping lock held.
*/
-struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags)
+struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned int dev_idx,
+ unsigned long flags)
{
struct list_head *list;
struct dm_zone *zone;
- unsigned int dev_idx = 0;
+ int i = 0;
again:
if (flags & DMZ_ALLOC_CACHE)
@@ -2205,8 +2206,12 @@ struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags)
*/
if (!(flags & DMZ_ALLOC_RECLAIM))
return NULL;
- if (dev_idx < zmd->nr_devs) {
- dev_idx++;
+ /*
+ * Try to allocate from other devices
+ */
+ if (i < zmd->nr_devs) {
+ dev_idx = (dev_idx + 1) % zmd->nr_devs;
+ i++;
goto again;
}
diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
index 18edf1b9bf52..5a04e34d17a9 100644
--- a/drivers/md/dm-zoned-reclaim.c
+++ b/drivers/md/dm-zoned-reclaim.c
@@ -288,7 +288,8 @@ static int dmz_reclaim_rnd_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
/* Get a free random or sequential zone */
dmz_lock_map(zmd);
again:
- szone = dmz_alloc_zone(zmd, alloc_flags | DMZ_ALLOC_RECLAIM);
+ szone = dmz_alloc_zone(zmd, zrc->dev_idx,
+ alloc_flags | DMZ_ALLOC_RECLAIM);
if (!szone && alloc_flags == DMZ_ALLOC_SEQ && dmz_nr_cache_zones(zmd)) {
alloc_flags = DMZ_ALLOC_RND;
goto again;
diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
index f2a760f62db5..ec020bb1caf7 100644
--- a/drivers/md/dm-zoned.h
+++ b/drivers/md/dm-zoned.h
@@ -214,7 +214,8 @@ bool dmz_dev_is_dying(struct dmz_metadata *zmd);
#define DMZ_ALLOC_SEQ 0x04
#define DMZ_ALLOC_RECLAIM 0x10
-struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags);
+struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd,
+ unsigned int dev_idx, unsigned long flags);
void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *zone,
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 13/15] dm-zoned: select reclaim zone based on device index
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (11 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 12/15] dm-zoned: allocate zone by device index Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 14/15] dm-zoned: prefer full zones for reclaim Hannes Reinecke
` (2 subsequent siblings)
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
per-device reclaim should select zones on that device only.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 50 +++++++++++++++++-------------------------
drivers/md/dm-zoned-reclaim.c | 3 ++-
drivers/md/dm-zoned-target.c | 1 +
drivers/md/dm-zoned.h | 5 ++++-
4 files changed, 27 insertions(+), 32 deletions(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 7f46b2ea554c..6c8d4ddd8b27 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1936,7 +1936,7 @@ static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone)
* Select a cache or random write zone for reclaim.
*/
static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
- bool idle)
+ unsigned int idx, bool idle)
{
struct dm_zone *dzone = NULL;
struct dm_zone *zone;
@@ -1946,24 +1946,17 @@ static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
if (zmd->nr_cache) {
zone_list = &zmd->map_cache_list;
/* Try to relaim random zones, too, when idle */
- if (idle && list_empty(zone_list)) {
- int i;
-
- for (i = 1; i < zmd->nr_devs; i++) {
- zone_list = &zmd->dev[i].map_rnd_list;
- if (!list_empty(zone_list))
- break;
- }
- }
- } else {
- /* Otherwise the random zones are on the first disk */
- zone_list = &zmd->dev[0].map_rnd_list;
- }
+ if (idle && list_empty(zone_list))
+ zone_list = &zmd->dev[idx].map_rnd_list;
+ } else
+ zone_list = &zmd->dev[idx].map_rnd_list;
list_for_each_entry(zone, zone_list, link) {
- if (dmz_is_buf(zone))
+ if (dmz_is_buf(zone)) {
dzone = zone->bzone;
- else
+ if (dzone->dev->dev_idx != idx)
+ continue;
+ } else
dzone = zone;
if (dmz_lock_zone_reclaim(dzone))
return dzone;
@@ -1975,20 +1968,16 @@ static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
/*
* Select a buffered sequential zone for reclaim.
*/
-static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd)
+static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd,
+ unsigned int idx)
{
struct dm_zone *zone;
- int i;
-
- for (i = 0; i < zmd->nr_devs; i++) {
- struct dmz_dev *dev = &zmd->dev[i];
- list_for_each_entry(zone, &dev->map_seq_list, link) {
- if (!zone->bzone)
- continue;
- if (dmz_lock_zone_reclaim(zone))
- return zone;
- }
+ list_for_each_entry(zone, &zmd->dev[idx].map_seq_list, link) {
+ if (!zone->bzone)
+ continue;
+ if (dmz_lock_zone_reclaim(zone))
+ return zone;
}
return NULL;
@@ -1997,7 +1986,8 @@ static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd)
/*
* Select a zone for reclaim.
*/
-struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd, bool idle)
+struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd,
+ unsigned int dev_idx, bool idle)
{
struct dm_zone *zone;
@@ -2011,9 +2001,9 @@ struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd, bool idle)
*/
dmz_lock_map(zmd);
if (list_empty(&zmd->reserved_seq_zones_list))
- zone = dmz_get_seq_zone_for_reclaim(zmd);
+ zone = dmz_get_seq_zone_for_reclaim(zmd, dev_idx);
else
- zone = dmz_get_rnd_zone_for_reclaim(zmd, idle);
+ zone = dmz_get_rnd_zone_for_reclaim(zmd, dev_idx, idle);
dmz_unlock_map(zmd);
return zone;
diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
index 5a04e34d17a9..2261b4dd60b7 100644
--- a/drivers/md/dm-zoned-reclaim.c
+++ b/drivers/md/dm-zoned-reclaim.c
@@ -370,7 +370,8 @@ static int dmz_do_reclaim(struct dmz_reclaim *zrc)
int ret;
/* Get a data zone */
- dzone = dmz_get_zone_for_reclaim(zmd, dmz_target_idle(zrc));
+ dzone = dmz_get_zone_for_reclaim(zmd, zrc->dev_idx,
+ dmz_target_idle(zrc));
if (!dzone) {
DMDEBUG("(%s/%u): No zone found to reclaim",
dmz_metadata_label(zmd), zrc->dev_idx);
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index 4a51738d4b0d..a23f1fbd208f 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -738,6 +738,7 @@ static int dmz_get_zoned_device(struct dm_target *ti, char *path,
dev = &dmz->dev[idx];
}
dev->bdev = bdev;
+ dev->dev_idx = idx;
(void)bdevname(dev->bdev, dev->name);
dev->capacity = i_size_read(bdev->bd_inode) >> SECTOR_SHIFT;
diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
index ec020bb1caf7..22f11440b423 100644
--- a/drivers/md/dm-zoned.h
+++ b/drivers/md/dm-zoned.h
@@ -61,6 +61,8 @@ struct dmz_dev {
sector_t capacity;
+ unsigned int dev_idx;
+
unsigned int nr_zones;
unsigned int zone_offset;
@@ -243,7 +245,8 @@ static inline void dmz_activate_zone(struct dm_zone *zone)
int dmz_lock_zone_reclaim(struct dm_zone *zone);
void dmz_unlock_zone_reclaim(struct dm_zone *zone);
-struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd, bool idle);
+struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd,
+ unsigned int dev_idx, bool idle);
struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd,
unsigned int chunk, int op);
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 14/15] dm-zoned: prefer full zones for reclaim
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (12 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 13/15] dm-zoned: select reclaim zone based on " Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 11:09 ` [PATCH 15/15] dm-zoned: check superblock location Hannes Reinecke
2020-06-02 22:27 ` [PATCHv4 00/15] dm-zoned: multiple drive support Mike Snitzer
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
Prefer full zones when selecting the next zone for reclaim.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
drivers/md/dm-zoned-metadata.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 6c8d4ddd8b27..e01ca1c57ff2 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1939,7 +1939,7 @@ static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
unsigned int idx, bool idle)
{
struct dm_zone *dzone = NULL;
- struct dm_zone *zone;
+ struct dm_zone *zone, *last = NULL;
struct list_head *zone_list;
/* If we have cache zones select from the cache zone list */
@@ -1956,6 +1956,13 @@ static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
dzone = zone->bzone;
if (dzone->dev->dev_idx != idx)
continue;
+ if (!last) {
+ last = dzone;
+ continue;
+ }
+ if (last->weight < dzone->weight)
+ continue;
+ dzone = last;
} else
dzone = zone;
if (dmz_lock_zone_reclaim(dzone))
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PATCH 15/15] dm-zoned: check superblock location
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (13 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 14/15] dm-zoned: prefer full zones for reclaim Hannes Reinecke
@ 2020-06-02 11:09 ` Hannes Reinecke
2020-06-02 22:27 ` [PATCHv4 00/15] dm-zoned: multiple drive support Mike Snitzer
15 siblings, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-02 11:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
When specifying several devices we need to check the superblock
location to ensure the devices are specified in the correct order.
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/md/dm-zoned-metadata.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index e01ca1c57ff2..bf54c5d90095 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -995,7 +995,7 @@ static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_sb *dsb,
struct dmz_dev *dev = dsb->dev;
unsigned int nr_meta_zones, nr_data_zones;
u32 crc, stored_crc;
- u64 gen;
+ u64 gen, sb_block;
if (le32_to_cpu(sb->magic) != DMZ_MAGIC) {
dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)",
@@ -1024,6 +1024,14 @@ static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_sb *dsb,
return -ENXIO;
}
+ sb_block = le64_to_cpu(sb->sb_block);
+ if (sb_block != (u64)dsb->zone->id << zmd->zone_nr_blocks_shift ) {
+ dmz_dev_err(dev, "Invalid superblock position "
+ "(is %llu expected %llu)",
+ sb_block,
+ (u64)dsb->zone->id << zmd->zone_nr_blocks_shift);
+ return -EINVAL;
+ }
if (zmd->sb_version > 1) {
uuid_t sb_uuid;
--
2.16.4
^ permalink raw reply related [flat|nested] 19+ messages in thread* Re: [PATCHv4 00/15] dm-zoned: multiple drive support
2020-06-02 11:09 [PATCHv4 00/15] dm-zoned: multiple drive support Hannes Reinecke
` (14 preceding siblings ...)
2020-06-02 11:09 ` [PATCH 15/15] dm-zoned: check superblock location Hannes Reinecke
@ 2020-06-02 22:27 ` Mike Snitzer
2020-06-03 1:11 ` Damien Le Moal
2020-06-03 7:09 ` Hannes Reinecke
15 siblings, 2 replies; 19+ messages in thread
From: Mike Snitzer @ 2020-06-02 22:27 UTC (permalink / raw)
To: Hannes Reinecke; +Cc: Damien LeMoal, dm-devel
On Tue, Jun 02 2020 at 7:09am -0400,
Hannes Reinecke <hare@suse.de> wrote:
> Hi all,
>
> here's the second version of my patchset to support multiple zoned
> drives with dm-zoned.
> This patchset:
> - Converts the zone array to using xarray for better scalability
> - Separates out shared structures into per-device structure
> - Enforce drive-locality for allocating and reclaiming zones
> - Lifts the restriction of 2 devices to handle an arbitrary number
> of drives.
>
> This gives me a near-perfect scalability by increasing the write
> speed from 150MB/s (for a cache and one zoned drive) to 300MB/s
> (for a cache and two zoned drives).
>
> Changes to v1:
> - Include reviews from Damien
> - Reshuffle patches
> Changes to v2:
> - Add reviews from Damien
> - Merge patches 'dynamic device allocation' and
> 'support arbitrary number of devices'
> - Fix memory leak when reading tertiary superblocks
> Changes to v3:
> - Add reviews from Damien
> - Add patch to ensure correct device ordering
I've picked this series up for 5.8 (yes, I know it is last minute). But
I saw no benefit to merging the initial 2 device step in 5.8 only to
then churn the code and interface to support an arbitrary number of
devices in 5.9. Easier to support one major update to the code now.
As such the target's version number was _not_ bumped from 2.0.0 to
3.0.0.
I tweaked various patch headers (_please_ "dm zoned" instead of
"dm-zoned" in commit subjects, also don't ever say "we" or "this patch"
in a commit header... if you do, I am forced to rewrite the header).
BTW, just so I feel like I said it: all these changes to use additional
device(s) really seems like a tradeoff between performance and reduced
MTBF -- there is increased potential for failure with each additional
device that is added to the dm-zoned device... there I've said it ;)
Thanks,
Mike
^ permalink raw reply [flat|nested] 19+ messages in thread* Re: [PATCHv4 00/15] dm-zoned: multiple drive support
2020-06-02 22:27 ` [PATCHv4 00/15] dm-zoned: multiple drive support Mike Snitzer
@ 2020-06-03 1:11 ` Damien Le Moal
2020-06-03 7:09 ` Hannes Reinecke
1 sibling, 0 replies; 19+ messages in thread
From: Damien Le Moal @ 2020-06-03 1:11 UTC (permalink / raw)
To: Mike Snitzer, Hannes Reinecke; +Cc: dm-devel@redhat.com
On 2020/06/03 7:27, Mike Snitzer wrote:
> On Tue, Jun 02 2020 at 7:09am -0400,
> Hannes Reinecke <hare@suse.de> wrote:
>
>> Hi all,
>>
>> here's the second version of my patchset to support multiple zoned
>> drives with dm-zoned.
>> This patchset:
>> - Converts the zone array to using xarray for better scalability
>> - Separates out shared structures into per-device structure
>> - Enforce drive-locality for allocating and reclaiming zones
>> - Lifts the restriction of 2 devices to handle an arbitrary number
>> of drives.
>>
>> This gives me a near-perfect scalability by increasing the write
>> speed from 150MB/s (for a cache and one zoned drive) to 300MB/s
>> (for a cache and two zoned drives).
>>
>> Changes to v1:
>> - Include reviews from Damien
>> - Reshuffle patches
>> Changes to v2:
>> - Add reviews from Damien
>> - Merge patches 'dynamic device allocation' and
>> 'support arbitrary number of devices'
>> - Fix memory leak when reading tertiary superblocks
>> Changes to v3:
>> - Add reviews from Damien
>> - Add patch to ensure correct device ordering
>
> I've picked this series up for 5.8 (yes, I know it is last minute). But
> I saw no benefit to merging the initial 2 device step in 5.8 only to
> then churn the code and interface to support an arbitrary number of
> devices in 5.9. Easier to support one major update to the code now.
>
> As such the target's version number was _not_ bumped from 2.0.0 to
> 3.0.0.
>
> I tweaked various patch headers (_please_ "dm zoned" instead of
> "dm-zoned" in commit subjects, also don't ever say "we" or "this patch"
> in a commit header... if you do, I am forced to rewrite the header).
>
> BTW, just so I feel like I said it: all these changes to use additional
> device(s) really seems like a tradeoff between performance and reduced
> MTBF -- there is increased potential for failure with each additional
> device that is added to the dm-zoned device... there I've said it ;)
Yes, agreed. While the cache SSD + 1xSMR disk can I think have reasonable
applications, more than 1 SMR disk without any data protection is indeed
dangerous. However, I think that we now have a good base to improve this:
duplication of zones across devices using reclaim should not be difficult to
implement. That is a RAID1 level, to which we can even add more than one copy
again with reclaim (dm-kcopyd comes in very handy for that). And I am still
thinking of ways to erasure code zones across the multiple devices to raise the
possible RAID levels :)
Another approach would be to do intelligent stacking of dm-raid on top of
dm-zoned devices. "intelligent" here means that in case of any drive failure,
only a partial rebuild of the dm-zoned device with the failed drive is needed:
one only needs to rebuild the sector chunks that the failed SMR drive was holding.
>
> Thanks,
> Mike
>
>
--
Damien Le Moal
Western Digital Research
^ permalink raw reply [flat|nested] 19+ messages in thread
* Re: [PATCHv4 00/15] dm-zoned: multiple drive support
2020-06-02 22:27 ` [PATCHv4 00/15] dm-zoned: multiple drive support Mike Snitzer
2020-06-03 1:11 ` Damien Le Moal
@ 2020-06-03 7:09 ` Hannes Reinecke
1 sibling, 0 replies; 19+ messages in thread
From: Hannes Reinecke @ 2020-06-03 7:09 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien LeMoal, dm-devel
On 6/3/20 12:27 AM, Mike Snitzer wrote:
> On Tue, Jun 02 2020 at 7:09am -0400,
> Hannes Reinecke <hare@suse.de> wrote:
>
>> Hi all,
>>
>> here's the second version of my patchset to support multiple zoned
>> drives with dm-zoned.
>> This patchset:
>> - Converts the zone array to using xarray for better scalability
>> - Separates out shared structures into per-device structure
>> - Enforce drive-locality for allocating and reclaiming zones
>> - Lifts the restriction of 2 devices to handle an arbitrary number
>> of drives.
>>
>> This gives me a near-perfect scalability by increasing the write
>> speed from 150MB/s (for a cache and one zoned drive) to 300MB/s
>> (for a cache and two zoned drives).
>>
>> Changes to v1:
>> - Include reviews from Damien
>> - Reshuffle patches
>> Changes to v2:
>> - Add reviews from Damien
>> - Merge patches 'dynamic device allocation' and
>> 'support arbitrary number of devices'
>> - Fix memory leak when reading tertiary superblocks
>> Changes to v3:
>> - Add reviews from Damien
>> - Add patch to ensure correct device ordering
>
> I've picked this series up for 5.8 (yes, I know it is last minute). But
> I saw no benefit to merging the initial 2 device step in 5.8 only to
> then churn the code and interface to support an arbitrary number of
> devices in 5.9. Easier to support one major update to the code now.
>
> As such the target's version number was _not_ bumped from 2.0.0 to
> 3.0.0.
>
> I tweaked various patch headers (_please_ "dm zoned" instead of
> "dm-zoned" in commit subjects, also don't ever say "we" or "this patch"
> in a commit header... if you do, I am forced to rewrite the header).
>
> BTW, just so I feel like I said it: all these changes to use additional
> device(s) really seems like a tradeoff between performance and reduced
> MTBF -- there is increased potential for failure with each additional
> device that is added to the dm-zoned device... there I've said it ;)
>
"We" (sic) are fully aware. And I'm looking into it.
Thanks for merging it. Most appreciated.
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel
^ permalink raw reply [flat|nested] 19+ messages in thread