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dm zoned: convert to xarray

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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>
Signed-off-by: Colin Ian King <colin.king@canonical.com> # fix leak in dmz_insert
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Hannes Reinecke 2020-06-02 13:09:46 +02:00 committed by Mike Snitzer
parent aec67b4ffa
commit a92fbc446d
1 changed files with 90 additions and 32 deletions
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122
drivers/md/dm-zoned-metadata.c
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@ -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 +327,32 @@ 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)) {
kfree(zone);
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 +1148,7 @@ 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 +1161,15 @@ 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 +1285,12 @@ 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 +1371,11 @@ 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 +1387,6 @@ 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 +1426,17 @@ 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 +1448,7 @@ static void dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev)
}
zone_offset += zmd->zone_nr_sectors;
}
return 0;
}
/*
@ -1427,8 +1456,15 @@ 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 +1496,25 @@ 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 +1617,6 @@ 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 +1698,11 @@ 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 +1726,11 @@ 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 +1761,8 @@ next:
*/
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 +2026,10 @@ again:
} 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 +2846,12 @@ 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);