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linux_dsm_epyc7002/drivers/md/dm-zoned-metadata.c
Shin'ichiro Kawasaki f2cd9a5e85 dm zoned: Fix reclaim zone selection 
When dm zoned has multiple devices, random zones are never selected for
reclaim if all reserved sequential write zones are in use and no
sequential write required zones can be selected for reclaim. This can
lead to deadlocks as selecting a cache zone allows reclaiming a
sequential zone, ensuring forward progress.

Fix this by always defaulting to selecting a random zone when no
sequential write required zone can be selected.

[Damien: fix commit message]

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2020-06-19 12:29:39 -04:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2017 Western Digital Corporation or its affiliates.
*
* This file is released under the GPL.
*/
#include "dm-zoned.h"
#include <linux/module.h>
#include <linux/crc32.h>
#include <linux/sched/mm.h>
#define DM_MSG_PREFIX "zoned metadata"
/*
* Metadata version.
*/
#define DMZ_META_VER 2
/*
* On-disk super block magic.
*/
#define DMZ_MAGIC ((((unsigned int)('D')) << 24) | \
(((unsigned int)('Z')) << 16) | \
(((unsigned int)('B')) << 8) | \
((unsigned int)('D')))
/*
* On disk super block.
* This uses only 512 B but uses on disk a full 4KB block. This block is
* followed on disk by the mapping table of chunks to zones and the bitmap
* blocks indicating zone block validity.
* The overall resulting metadata format is:
* (1) Super block (1 block)
* (2) Chunk mapping table (nr_map_blocks)
* (3) Bitmap blocks (nr_bitmap_blocks)
* All metadata blocks are stored in conventional zones, starting from
* the first conventional zone found on disk.
*/
struct dmz_super {
/* Magic number */
__le32 magic; /* 4 */
/* Metadata version number */
__le32 version; /* 8 */
/* Generation number */
__le64 gen; /* 16 */
/* This block number */
__le64 sb_block; /* 24 */
/* The number of metadata blocks, including this super block */
__le32 nr_meta_blocks; /* 28 */
/* The number of sequential zones reserved for reclaim */
__le32 nr_reserved_seq; /* 32 */
/* The number of entries in the mapping table */
__le32 nr_chunks; /* 36 */
/* The number of blocks used for the chunk mapping table */
__le32 nr_map_blocks; /* 40 */
/* The number of blocks used for the block bitmaps */
__le32 nr_bitmap_blocks; /* 44 */
/* Checksum */
__le32 crc; /* 48 */
/* DM-Zoned label */
u8 dmz_label[32]; /* 80 */
/* DM-Zoned UUID */
u8 dmz_uuid[16]; /* 96 */
/* Device UUID */
u8 dev_uuid[16]; /* 112 */
/* Padding to full 512B sector */
u8 reserved[400]; /* 512 */
};
/*
* Chunk mapping entry: entries are indexed by chunk number
* and give the zone ID (dzone_id) mapping the chunk on disk.
* This zone may be sequential or random. If it is a sequential
* zone, a second zone (bzone_id) used as a write buffer may
* also be specified. This second zone will always be a randomly
* writeable zone.
*/
struct dmz_map {
__le32 dzone_id;
__le32 bzone_id;
};
/*
* Chunk mapping table metadata: 512 8-bytes entries per 4KB block.
*/
#define DMZ_MAP_ENTRIES (DMZ_BLOCK_SIZE / sizeof(struct dmz_map))
#define DMZ_MAP_ENTRIES_SHIFT (ilog2(DMZ_MAP_ENTRIES))
#define DMZ_MAP_ENTRIES_MASK (DMZ_MAP_ENTRIES - 1)
#define DMZ_MAP_UNMAPPED UINT_MAX
/*
* Meta data block descriptor (for cached metadata blocks).
*/
struct dmz_mblock {
struct rb_node node;
struct list_head link;
sector_t no;
unsigned int ref;
unsigned long state;
struct page *page;
void *data;
};
/*
* Metadata block state flags.
*/
enum {
DMZ_META_DIRTY,
DMZ_META_READING,
DMZ_META_WRITING,
DMZ_META_ERROR,
};
/*
* Super block information (one per metadata set).
*/
struct dmz_sb {
sector_t block;
struct dmz_dev *dev;
struct dmz_mblock *mblk;
struct dmz_super *sb;
struct dm_zone *zone;
};
/*
* In-memory metadata.
*/
struct dmz_metadata {
struct dmz_dev *dev;
unsigned int nr_devs;
char devname[BDEVNAME_SIZE];
char label[BDEVNAME_SIZE];
uuid_t uuid;
sector_t zone_bitmap_size;
unsigned int zone_nr_bitmap_blocks;
unsigned int zone_bits_per_mblk;
sector_t zone_nr_blocks;
sector_t zone_nr_blocks_shift;
sector_t zone_nr_sectors;
sector_t zone_nr_sectors_shift;
unsigned int nr_bitmap_blocks;
unsigned int nr_map_blocks;
unsigned int nr_zones;
unsigned int nr_useable_zones;
unsigned int nr_meta_blocks;
unsigned int nr_meta_zones;
unsigned int nr_data_zones;
unsigned int nr_cache_zones;
unsigned int nr_rnd_zones;
unsigned int nr_reserved_seq;
unsigned int nr_chunks;
/* Zone information array */
struct xarray zones;
struct dmz_sb sb[2];
unsigned int mblk_primary;
unsigned int sb_version;
u64 sb_gen;
unsigned int min_nr_mblks;
unsigned int max_nr_mblks;
atomic_t nr_mblks;
struct rw_semaphore mblk_sem;
struct mutex mblk_flush_lock;
spinlock_t mblk_lock;
struct rb_root mblk_rbtree;
struct list_head mblk_lru_list;
struct list_head mblk_dirty_list;
struct shrinker mblk_shrinker;
/* Zone allocation management */
struct mutex map_lock;
struct dmz_mblock **map_mblk;
unsigned int nr_cache;
atomic_t unmap_nr_cache;
struct list_head unmap_cache_list;
struct list_head map_cache_list;
atomic_t nr_reserved_seq_zones;
struct list_head reserved_seq_zones_list;
wait_queue_head_t free_wq;
};
#define dmz_zmd_info(zmd, format, args...) \
DMINFO("(%s): " format, (zmd)->label, ## args)
#define dmz_zmd_err(zmd, format, args...) \
DMERR("(%s): " format, (zmd)->label, ## args)
#define dmz_zmd_warn(zmd, format, args...) \
DMWARN("(%s): " format, (zmd)->label, ## args)
#define dmz_zmd_debug(zmd, format, args...) \
DMDEBUG("(%s): " format, (zmd)->label, ## args)
/*
* Various accessors
*/
static unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone)
{
if (WARN_ON(!zone))
return 0;
return zone->id - zone->dev->zone_offset;
}
sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone)
{
unsigned int zone_id = dmz_dev_zone_id(zmd, zone);
return (sector_t)zone_id << zmd->zone_nr_sectors_shift;
}
sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone)
{
unsigned int zone_id = dmz_dev_zone_id(zmd, zone);
return (sector_t)zone_id << zmd->zone_nr_blocks_shift;
}
unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd)
{
return zmd->zone_nr_blocks;
}
unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd)
{
return zmd->zone_nr_blocks_shift;
}
unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd)
{
return zmd->zone_nr_sectors;
}
unsigned int dmz_zone_nr_sectors_shift(struct dmz_metadata *zmd)
{
return zmd->zone_nr_sectors_shift;
}
unsigned int dmz_nr_zones(struct dmz_metadata *zmd)
{
return zmd->nr_zones;
}
unsigned int dmz_nr_chunks(struct dmz_metadata *zmd)
{
return zmd->nr_chunks;
}
unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd, int idx)
{
return zmd->dev[idx].nr_rnd;
}
unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd, int idx)
{
return atomic_read(&zmd->dev[idx].unmap_nr_rnd);
}
unsigned int dmz_nr_cache_zones(struct dmz_metadata *zmd)
{
return zmd->nr_cache;
}
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, int idx)
{
return zmd->dev[idx].nr_seq;
}
unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd, int idx)
{
return atomic_read(&zmd->dev[idx].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 dmz_dev *dev)
{
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;
zone->dev = dev;
return zone;
}
const char *dmz_metadata_label(struct dmz_metadata *zmd)
{
return (const char *)zmd->label;
}
bool dmz_check_dev(struct dmz_metadata *zmd)
{
unsigned int i;
for (i = 0; i < zmd->nr_devs; i++) {
if (!dmz_check_bdev(&zmd->dev[i]))
return false;
}
return true;
}
bool dmz_dev_is_dying(struct dmz_metadata *zmd)
{
unsigned int i;
for (i = 0; i < zmd->nr_devs; i++) {
if (dmz_bdev_is_dying(&zmd->dev[i]))
return true;
}
return false;
}
/*
* Lock/unlock mapping table.
* The map lock also protects all the zone lists.
*/
void dmz_lock_map(struct dmz_metadata *zmd)
{
mutex_lock(&zmd->map_lock);
}
void dmz_unlock_map(struct dmz_metadata *zmd)
{
mutex_unlock(&zmd->map_lock);
}
/*
* Lock/unlock metadata access. This is a "read" lock on a semaphore
* that prevents metadata flush from running while metadata are being
* modified. The actual metadata write mutual exclusion is achieved with
* the map lock and zone state management (active and reclaim state are
* mutually exclusive).
*/
void dmz_lock_metadata(struct dmz_metadata *zmd)
{
down_read(&zmd->mblk_sem);
}
void dmz_unlock_metadata(struct dmz_metadata *zmd)
{
up_read(&zmd->mblk_sem);
}
/*
* Lock/unlock flush: prevent concurrent executions
* of dmz_flush_metadata as well as metadata modification in reclaim
* while flush is being executed.
*/
void dmz_lock_flush(struct dmz_metadata *zmd)
{
mutex_lock(&zmd->mblk_flush_lock);
}
void dmz_unlock_flush(struct dmz_metadata *zmd)
{
mutex_unlock(&zmd->mblk_flush_lock);
}
/*
* Allocate a metadata block.
*/
static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd,
sector_t mblk_no)
{
struct dmz_mblock *mblk = NULL;
/* See if we can reuse cached blocks */
if (zmd->max_nr_mblks && atomic_read(&zmd->nr_mblks) > zmd->max_nr_mblks) {
spin_lock(&zmd->mblk_lock);
mblk = list_first_entry_or_null(&zmd->mblk_lru_list,
struct dmz_mblock, link);
if (mblk) {
list_del_init(&mblk->link);
rb_erase(&mblk->node, &zmd->mblk_rbtree);
mblk->no = mblk_no;
}
spin_unlock(&zmd->mblk_lock);
if (mblk)
return mblk;
}
/* Allocate a new block */
mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO);
if (!mblk)
return NULL;
mblk->page = alloc_page(GFP_NOIO);
if (!mblk->page) {
kfree(mblk);
return NULL;
}
RB_CLEAR_NODE(&mblk->node);
INIT_LIST_HEAD(&mblk->link);
mblk->ref = 0;
mblk->state = 0;
mblk->no = mblk_no;
mblk->data = page_address(mblk->page);
atomic_inc(&zmd->nr_mblks);
return mblk;
}
/*
* Free a metadata block.
*/
static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk)
{
__free_pages(mblk->page, 0);
kfree(mblk);
atomic_dec(&zmd->nr_mblks);
}
/*
* Insert a metadata block in the rbtree.
*/
static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk)
{
struct rb_root *root = &zmd->mblk_rbtree;
struct rb_node **new = &(root->rb_node), *parent = NULL;
struct dmz_mblock *b;
/* Figure out where to put the new node */
while (*new) {
b = container_of(*new, struct dmz_mblock, node);
parent = *new;
new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right);
}
/* Add new node and rebalance tree */
rb_link_node(&mblk->node, parent, new);
rb_insert_color(&mblk->node, root);
}
/*
* Lookup a metadata block in the rbtree. If the block is found, increment
* its reference count.
*/
static struct dmz_mblock *dmz_get_mblock_fast(struct dmz_metadata *zmd,
sector_t mblk_no)
{
struct rb_root *root = &zmd->mblk_rbtree;
struct rb_node *node = root->rb_node;
struct dmz_mblock *mblk;
while (node) {
mblk = container_of(node, struct dmz_mblock, node);
if (mblk->no == mblk_no) {
/*
* If this is the first reference to the block,
* remove it from the LRU list.
*/
mblk->ref++;
if (mblk->ref == 1 &&
!test_bit(DMZ_META_DIRTY, &mblk->state))
list_del_init(&mblk->link);
return mblk;
}
node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right;
}
return NULL;
}
/*
* Metadata block BIO end callback.
*/
static void dmz_mblock_bio_end_io(struct bio *bio)
{
struct dmz_mblock *mblk = bio->bi_private;
int flag;
if (bio->bi_status)
set_bit(DMZ_META_ERROR, &mblk->state);
if (bio_op(bio) == REQ_OP_WRITE)
flag = DMZ_META_WRITING;
else
flag = DMZ_META_READING;
clear_bit_unlock(flag, &mblk->state);
smp_mb__after_atomic();
wake_up_bit(&mblk->state, flag);
bio_put(bio);
}
/*
* Read an uncached metadata block from disk and add it to the cache.
*/
static struct dmz_mblock *dmz_get_mblock_slow(struct dmz_metadata *zmd,
sector_t mblk_no)
{
struct dmz_mblock *mblk, *m;
sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no;
struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev;
struct bio *bio;
if (dmz_bdev_is_dying(dev))
return ERR_PTR(-EIO);
/* Get a new block and a BIO to read it */
mblk = dmz_alloc_mblock(zmd, mblk_no);
if (!mblk)
return ERR_PTR(-ENOMEM);
bio = bio_alloc(GFP_NOIO, 1);
if (!bio) {
dmz_free_mblock(zmd, mblk);
return ERR_PTR(-ENOMEM);
}
spin_lock(&zmd->mblk_lock);
/*
* Make sure that another context did not start reading
* the block already.
*/
m = dmz_get_mblock_fast(zmd, mblk_no);
if (m) {
spin_unlock(&zmd->mblk_lock);
dmz_free_mblock(zmd, mblk);
bio_put(bio);
return m;
}
mblk->ref++;
set_bit(DMZ_META_READING, &mblk->state);
dmz_insert_mblock(zmd, mblk);
spin_unlock(&zmd->mblk_lock);
/* Submit read BIO */
bio->bi_iter.bi_sector = dmz_blk2sect(block);
bio_set_dev(bio, dev->bdev);
bio->bi_private = mblk;
bio->bi_end_io = dmz_mblock_bio_end_io;
bio_set_op_attrs(bio, REQ_OP_READ, REQ_META | REQ_PRIO);
bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0);
submit_bio(bio);
return mblk;
}
/*
* Free metadata blocks.
*/
static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd,
unsigned long limit)
{
struct dmz_mblock *mblk;
unsigned long count = 0;
if (!zmd->max_nr_mblks)
return 0;
while (!list_empty(&zmd->mblk_lru_list) &&
atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks &&
count < limit) {
mblk = list_first_entry(&zmd->mblk_lru_list,
struct dmz_mblock, link);
list_del_init(&mblk->link);
rb_erase(&mblk->node, &zmd->mblk_rbtree);
dmz_free_mblock(zmd, mblk);
count++;
}
return count;
}
/*
* For mblock shrinker: get the number of unused metadata blocks in the cache.
*/
static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink,
struct shrink_control *sc)
{
struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker);
return atomic_read(&zmd->nr_mblks);
}
/*
* For mblock shrinker: scan unused metadata blocks and shrink the cache.
*/
static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink,
struct shrink_control *sc)
{
struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker);
unsigned long count;
spin_lock(&zmd->mblk_lock);
count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan);
spin_unlock(&zmd->mblk_lock);
return count ? count : SHRINK_STOP;
}
/*
* Release a metadata block.
*/
static void dmz_release_mblock(struct dmz_metadata *zmd,
struct dmz_mblock *mblk)
{
if (!mblk)
return;
spin_lock(&zmd->mblk_lock);
mblk->ref--;
if (mblk->ref == 0) {
if (test_bit(DMZ_META_ERROR, &mblk->state)) {
rb_erase(&mblk->node, &zmd->mblk_rbtree);
dmz_free_mblock(zmd, mblk);
} else if (!test_bit(DMZ_META_DIRTY, &mblk->state)) {
list_add_tail(&mblk->link, &zmd->mblk_lru_list);
dmz_shrink_mblock_cache(zmd, 1);
}
}
spin_unlock(&zmd->mblk_lock);
}
/*
* Get a metadata block from the rbtree. If the block
* is not present, read it from disk.
*/
static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd,
sector_t mblk_no)
{
struct dmz_mblock *mblk;
struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev;
/* Check rbtree */
spin_lock(&zmd->mblk_lock);
mblk = dmz_get_mblock_fast(zmd, mblk_no);
spin_unlock(&zmd->mblk_lock);
if (!mblk) {
/* Cache miss: read the block from disk */
mblk = dmz_get_mblock_slow(zmd, mblk_no);
if (IS_ERR(mblk))
return mblk;
}
/* Wait for on-going read I/O and check for error */
wait_on_bit_io(&mblk->state, DMZ_META_READING,
TASK_UNINTERRUPTIBLE);
if (test_bit(DMZ_META_ERROR, &mblk->state)) {
dmz_release_mblock(zmd, mblk);
dmz_check_bdev(dev);
return ERR_PTR(-EIO);
}
return mblk;
}
/*
* Mark a metadata block dirty.
*/
static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk)
{
spin_lock(&zmd->mblk_lock);
if (!test_and_set_bit(DMZ_META_DIRTY, &mblk->state))
list_add_tail(&mblk->link, &zmd->mblk_dirty_list);
spin_unlock(&zmd->mblk_lock);
}
/*
* Issue a metadata block write BIO.
*/
static int dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk,
unsigned int set)
{
struct dmz_dev *dev = zmd->sb[set].dev;
sector_t block = zmd->sb[set].block + mblk->no;
struct bio *bio;
if (dmz_bdev_is_dying(dev))
return -EIO;
bio = bio_alloc(GFP_NOIO, 1);
if (!bio) {
set_bit(DMZ_META_ERROR, &mblk->state);
return -ENOMEM;
}
set_bit(DMZ_META_WRITING, &mblk->state);
bio->bi_iter.bi_sector = dmz_blk2sect(block);
bio_set_dev(bio, dev->bdev);
bio->bi_private = mblk;
bio->bi_end_io = dmz_mblock_bio_end_io;
bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_META | REQ_PRIO);
bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0);
submit_bio(bio);
return 0;
}
/*
* Read/write a metadata block.
*/
static int dmz_rdwr_block(struct dmz_dev *dev, int op,
sector_t block, struct page *page)
{
struct bio *bio;
int ret;
if (WARN_ON(!dev))
return -EIO;
if (dmz_bdev_is_dying(dev))
return -EIO;
bio = bio_alloc(GFP_NOIO, 1);
if (!bio)
return -ENOMEM;
bio->bi_iter.bi_sector = dmz_blk2sect(block);
bio_set_dev(bio, dev->bdev);
bio_set_op_attrs(bio, op, REQ_SYNC | REQ_META | REQ_PRIO);
bio_add_page(bio, page, DMZ_BLOCK_SIZE, 0);
ret = submit_bio_wait(bio);
bio_put(bio);
if (ret)
dmz_check_bdev(dev);
return ret;
}
/*
* Write super block of the specified metadata set.
*/
static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set)
{
struct dmz_mblock *mblk = zmd->sb[set].mblk;
struct dmz_super *sb = zmd->sb[set].sb;
struct dmz_dev *dev = zmd->sb[set].dev;
sector_t sb_block;
u64 sb_gen = zmd->sb_gen + 1;
int ret;
sb->magic = cpu_to_le32(DMZ_MAGIC);
sb->version = cpu_to_le32(zmd->sb_version);
if (zmd->sb_version > 1) {
BUILD_BUG_ON(UUID_SIZE != 16);
export_uuid(sb->dmz_uuid, &zmd->uuid);
memcpy(sb->dmz_label, zmd->label, BDEVNAME_SIZE);
export_uuid(sb->dev_uuid, &dev->uuid);
}
sb->gen = cpu_to_le64(sb_gen);
/*
* The metadata always references the absolute block address,
* ie relative to the entire block range, not the per-device
* block address.
*/
sb_block = zmd->sb[set].zone->id << zmd->zone_nr_blocks_shift;
sb->sb_block = cpu_to_le64(sb_block);
sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks);
sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq);
sb->nr_chunks = cpu_to_le32(zmd->nr_chunks);
sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks);
sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks);
sb->crc = 0;
sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE));
ret = dmz_rdwr_block(dev, REQ_OP_WRITE, zmd->sb[set].block,
mblk->page);
if (ret == 0)
ret = blkdev_issue_flush(dev->bdev, GFP_NOIO);
return ret;
}
/*
* Write dirty metadata blocks to the specified set.
*/
static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd,
struct list_head *write_list,
unsigned int set)
{
struct dmz_mblock *mblk;
struct dmz_dev *dev = zmd->sb[set].dev;
struct blk_plug plug;
int ret = 0, nr_mblks_submitted = 0;
/* Issue writes */
blk_start_plug(&plug);
list_for_each_entry(mblk, write_list, link) {
ret = dmz_write_mblock(zmd, mblk, set);
if (ret)
break;
nr_mblks_submitted++;
}
blk_finish_plug(&plug);
/* Wait for completion */
list_for_each_entry(mblk, write_list, link) {
if (!nr_mblks_submitted)
break;
wait_on_bit_io(&mblk->state, DMZ_META_WRITING,
TASK_UNINTERRUPTIBLE);
if (test_bit(DMZ_META_ERROR, &mblk->state)) {
clear_bit(DMZ_META_ERROR, &mblk->state);
dmz_check_bdev(dev);
ret = -EIO;
}
nr_mblks_submitted--;
}
/* Flush drive cache (this will also sync data) */
if (ret == 0)
ret = blkdev_issue_flush(dev->bdev, GFP_NOIO);
return ret;
}
/*
* Log dirty metadata blocks.
*/
static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd,
struct list_head *write_list)
{
unsigned int log_set = zmd->mblk_primary ^ 0x1;
int ret;
/* Write dirty blocks to the log */
ret = dmz_write_dirty_mblocks(zmd, write_list, log_set);
if (ret)
return ret;
/*
* No error so far: now validate the log by updating the
* log index super block generation.
*/
ret = dmz_write_sb(zmd, log_set);
if (ret)
return ret;
return 0;
}
/*
* Flush dirty metadata blocks.
*/
int dmz_flush_metadata(struct dmz_metadata *zmd)
{
struct dmz_mblock *mblk;
struct list_head write_list;
struct dmz_dev *dev;
int ret;
if (WARN_ON(!zmd))
return 0;
INIT_LIST_HEAD(&write_list);
/*
* Make sure that metadata blocks are stable before logging: take
* the write lock on the metadata semaphore to prevent target BIOs
* from modifying metadata.
*/
down_write(&zmd->mblk_sem);
dev = zmd->sb[zmd->mblk_primary].dev;
/*
* This is called from the target flush work and reclaim work.
* Concurrent execution is not allowed.
*/
dmz_lock_flush(zmd);
if (dmz_bdev_is_dying(dev)) {
ret = -EIO;
goto out;
}
/* Get dirty blocks */
spin_lock(&zmd->mblk_lock);
list_splice_init(&zmd->mblk_dirty_list, &write_list);
spin_unlock(&zmd->mblk_lock);
/* If there are no dirty metadata blocks, just flush the device cache */
if (list_empty(&write_list)) {
ret = blkdev_issue_flush(dev->bdev, GFP_NOIO);
goto err;
}
/*
* The primary metadata set is still clean. Keep it this way until
* all updates are successful in the secondary set. That is, use
* the secondary set as a log.
*/
ret = dmz_log_dirty_mblocks(zmd, &write_list);
if (ret)
goto err;
/*
* The log is on disk. It is now safe to update in place
* in the primary metadata set.
*/
ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary);
if (ret)
goto err;
ret = dmz_write_sb(zmd, zmd->mblk_primary);
if (ret)
goto err;
while (!list_empty(&write_list)) {
mblk = list_first_entry(&write_list, struct dmz_mblock, link);
list_del_init(&mblk->link);
spin_lock(&zmd->mblk_lock);
clear_bit(DMZ_META_DIRTY, &mblk->state);
if (mblk->ref == 0)
list_add_tail(&mblk->link, &zmd->mblk_lru_list);
spin_unlock(&zmd->mblk_lock);
}
zmd->sb_gen++;
out:
dmz_unlock_flush(zmd);
up_write(&zmd->mblk_sem);
return ret;
err:
if (!list_empty(&write_list)) {
spin_lock(&zmd->mblk_lock);
list_splice(&write_list, &zmd->mblk_dirty_list);
spin_unlock(&zmd->mblk_lock);
}
if (!dmz_check_bdev(dev))
ret = -EIO;
goto out;
}
/*
* Check super block.
*/
static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_sb *dsb,
bool tertiary)
{
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, sb_block;
if (le32_to_cpu(sb->magic) != DMZ_MAGIC) {
dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)",
DMZ_MAGIC, le32_to_cpu(sb->magic));
return -ENXIO;
}
zmd->sb_version = le32_to_cpu(sb->version);
if (zmd->sb_version > DMZ_META_VER) {
dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)",
DMZ_META_VER, zmd->sb_version);
return -EINVAL;
}
if (zmd->sb_version < 2 && tertiary) {
dmz_dev_err(dev, "Tertiary superblocks are not supported");
return -EINVAL;
}
gen = le64_to_cpu(sb->gen);
stored_crc = le32_to_cpu(sb->crc);
sb->crc = 0;
crc = crc32_le(gen, (unsigned char *)sb, DMZ_BLOCK_SIZE);
if (crc != stored_crc) {
dmz_dev_err(dev, "Invalid checksum (needed 0x%08x, got 0x%08x)",
crc, stored_crc);
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;
import_uuid(&sb_uuid, sb->dmz_uuid);
if (uuid_is_null(&sb_uuid)) {
dmz_dev_err(dev, "NULL DM-Zoned uuid");
return -ENXIO;
} else if (uuid_is_null(&zmd->uuid)) {
uuid_copy(&zmd->uuid, &sb_uuid);
} else if (!uuid_equal(&zmd->uuid, &sb_uuid)) {
dmz_dev_err(dev, "mismatching DM-Zoned uuid, "
"is %pUl expected %pUl",
&sb_uuid, &zmd->uuid);
return -ENXIO;
}
if (!strlen(zmd->label))
memcpy(zmd->label, sb->dmz_label, BDEVNAME_SIZE);
else if (memcmp(zmd->label, sb->dmz_label, BDEVNAME_SIZE)) {
dmz_dev_err(dev, "mismatching DM-Zoned label, "
"is %s expected %s",
sb->dmz_label, zmd->label);
return -ENXIO;
}
import_uuid(&dev->uuid, sb->dev_uuid);
if (uuid_is_null(&dev->uuid)) {
dmz_dev_err(dev, "NULL device uuid");
return -ENXIO;
}
if (tertiary) {
/*
* Generation number should be 0, but it doesn't
* really matter if it isn't.
*/
if (gen != 0)
dmz_dev_warn(dev, "Invalid generation %llu",
gen);
return 0;
}
}
nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + zmd->zone_nr_blocks - 1)
>> zmd->zone_nr_blocks_shift;
if (!nr_meta_zones ||
(zmd->nr_devs <= 1 && nr_meta_zones >= zmd->nr_rnd_zones) ||
(zmd->nr_devs > 1 && nr_meta_zones >= zmd->nr_cache_zones)) {
dmz_dev_err(dev, "Invalid number of metadata blocks");
return -ENXIO;
}
if (!le32_to_cpu(sb->nr_reserved_seq) ||
le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) {
dmz_dev_err(dev, "Invalid number of reserved sequential zones");
return -ENXIO;
}
nr_data_zones = zmd->nr_useable_zones -
(nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq));
if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) {
dmz_dev_err(dev, "Invalid number of chunks %u / %u",
le32_to_cpu(sb->nr_chunks), nr_data_zones);
return -ENXIO;
}
/* OK */
zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks);
zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq);
zmd->nr_chunks = le32_to_cpu(sb->nr_chunks);
zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks);
zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks);
zmd->nr_meta_zones = nr_meta_zones;
zmd->nr_data_zones = nr_data_zones;
return 0;
}
/*
* Read the first or second super block from disk.
*/
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, sb->dev->name, sb->block);
return dmz_rdwr_block(sb->dev, REQ_OP_READ,
sb->block, sb->mblk->page);
}
/*
* Determine the position of the secondary super blocks on disk.
* This is used only if a corruption of the primary super block
* is detected.
*/
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 */
mblk = dmz_alloc_mblock(zmd, 0);
if (!mblk)
return -ENOMEM;
zmd->sb[1].mblk = mblk;
zmd->sb[1].sb = mblk->data;
/* Bad first super block: search for the second one */
zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks;
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, &zmd->sb[1], 1) != 0)
break;
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);
zmd->sb[1].mblk = NULL;
zmd->sb[1].zone = NULL;
zmd->sb[1].dev = NULL;
return -EIO;
}
/*
* Read a super block from disk.
*/
static int dmz_get_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set)
{
struct dmz_mblock *mblk;
int ret;
/* Allocate a block */
mblk = dmz_alloc_mblock(zmd, 0);
if (!mblk)
return -ENOMEM;
sb->mblk = mblk;
sb->sb = mblk->data;
/* Read super block */
ret = dmz_read_sb(zmd, sb, set);
if (ret) {
dmz_free_mblock(zmd, mblk);
sb->mblk = NULL;
return ret;
}
return 0;
}
/*
* Recover a metadata set.
*/
static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set)
{
unsigned int src_set = dst_set ^ 0x1;
struct page *page;
int i, ret;
dmz_dev_warn(zmd->sb[dst_set].dev,
"Metadata set %u invalid: recovering", dst_set);
if (dst_set == 0)
zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
else
zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
page = alloc_page(GFP_NOIO);
if (!page)
return -ENOMEM;
/* Copy metadata blocks */
for (i = 1; i < zmd->nr_meta_blocks; i++) {
ret = dmz_rdwr_block(zmd->sb[src_set].dev, REQ_OP_READ,
zmd->sb[src_set].block + i, page);
if (ret)
goto out;
ret = dmz_rdwr_block(zmd->sb[dst_set].dev, REQ_OP_WRITE,
zmd->sb[dst_set].block + i, page);
if (ret)
goto out;
}
/* Finalize with the super block */
if (!zmd->sb[dst_set].mblk) {
zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0);
if (!zmd->sb[dst_set].mblk) {
ret = -ENOMEM;
goto out;
}
zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data;
}
ret = dmz_write_sb(zmd, dst_set);
out:
__free_pages(page, 0);
return ret;
}
/*
* Get super block from disk.
*/
static int dmz_load_sb(struct dmz_metadata *zmd)
{
bool sb_good[2] = {false, false};
u64 sb_gen[2] = {0, 0};
int ret;
if (!zmd->sb[0].zone) {
dmz_zmd_err(zmd, "Primary super block zone not set");
return -ENXIO;
}
/* Read and check the primary super block */
zmd->sb[0].block = dmz_start_block(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");
return ret;
}
ret = dmz_check_sb(zmd, &zmd->sb[0], false);
/* Read and check secondary super block */
if (ret == 0) {
sb_good[0] = true;
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, &zmd->sb[1], 1);
} else
ret = dmz_lookup_secondary_sb(zmd);
if (ret) {
dmz_dev_err(zmd->sb[1].dev, "Read secondary super block failed");
return ret;
}
ret = dmz_check_sb(zmd, &zmd->sb[1], false);
if (ret == 0)
sb_good[1] = true;
/* Use highest generation sb first */
if (!sb_good[0] && !sb_good[1]) {
dmz_zmd_err(zmd, "No valid super block found");
return -EIO;
}
if (sb_good[0])
sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen);
else {
ret = dmz_recover_mblocks(zmd, 0);
if (ret) {
dmz_dev_err(zmd->sb[0].dev,
"Recovery of superblock 0 failed");
return -EIO;
}
}
if (sb_good[1])
sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen);
else {
ret = dmz_recover_mblocks(zmd, 1);
if (ret) {
dmz_dev_err(zmd->sb[1].dev,
"Recovery of superblock 1 failed");
return -EIO;
}
}
if (sb_gen[0] >= sb_gen[1]) {
zmd->sb_gen = sb_gen[0];
zmd->mblk_primary = 0;
} else {
zmd->sb_gen = sb_gen[1];
zmd->mblk_primary = 1;
}
dmz_dev_debug(zmd->sb[zmd->mblk_primary].dev,
"Using super block %u (gen %llu)",
zmd->mblk_primary, zmd->sb_gen);
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;
}
out_kfree:
kfree(sb);
}
return ret;
}
/*
* Initialize a zone descriptor.
*/
static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
{
struct dmz_dev *dev = data;
struct dmz_metadata *zmd = dev->metadata;
int idx = num + dev->zone_offset;
struct dm_zone *zone;
zone = dmz_insert(zmd, idx, dev);
if (IS_ERR(zone))
return PTR_ERR(zone);
if (blkz->len != zmd->zone_nr_sectors) {
if (zmd->sb_version > 1) {
/* Ignore the eventual runt (smaller) zone */
set_bit(DMZ_OFFLINE, &zone->flags);
return 0;
} else if (blkz->start + blkz->len == dev->capacity)
return 0;
return -ENXIO;
}
switch (blkz->type) {
case BLK_ZONE_TYPE_CONVENTIONAL:
set_bit(DMZ_RND, &zone->flags);
break;
case BLK_ZONE_TYPE_SEQWRITE_REQ:
case BLK_ZONE_TYPE_SEQWRITE_PREF:
set_bit(DMZ_SEQ, &zone->flags);
break;
default:
return -ENXIO;
}
if (dmz_is_rnd(zone))
zone->wp_block = 0;
else
zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start);
if (blkz->cond == BLK_ZONE_COND_OFFLINE)
set_bit(DMZ_OFFLINE, &zone->flags);
else if (blkz->cond == BLK_ZONE_COND_READONLY)
set_bit(DMZ_READ_ONLY, &zone->flags);
else {
zmd->nr_useable_zones++;
if (dmz_is_rnd(zone)) {
zmd->nr_rnd_zones++;
if (zmd->nr_devs == 1 && !zmd->sb[0].zone) {
/* Primary super block zone */
zmd->sb[0].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;
}
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;
zone = dmz_insert(zmd, idx, dev);
if (IS_ERR(zone))
return PTR_ERR(zone);
set_bit(DMZ_CACHE, &zone->flags);
zone->wp_block = 0;
zmd->nr_cache_zones++;
zmd->nr_useable_zones++;
if (dev->capacity - zone_offset < zmd->zone_nr_sectors) {
/* Disable runt zone */
set_bit(DMZ_OFFLINE, &zone->flags);
break;
}
zone_offset += zmd->zone_nr_sectors;
}
return 0;
}
/*
* Free zones descriptors.
*/
static void dmz_drop_zones(struct dmz_metadata *zmd)
{
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);
}
/*
* Allocate and initialize zone descriptors using the zone
* information from disk.
*/
static int dmz_init_zones(struct dmz_metadata *zmd)
{
int i, ret;
struct dmz_dev *zoned_dev = &zmd->dev[0];
/* Init */
zmd->zone_nr_sectors = zmd->dev[0].zone_nr_sectors;
zmd->zone_nr_sectors_shift = ilog2(zmd->zone_nr_sectors);
zmd->zone_nr_blocks = dmz_sect2blk(zmd->zone_nr_sectors);
zmd->zone_nr_blocks_shift = ilog2(zmd->zone_nr_blocks);
zmd->zone_bitmap_size = zmd->zone_nr_blocks >> 3;
zmd->zone_nr_bitmap_blocks =
max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT);
zmd->zone_bits_per_mblk = min_t(sector_t, zmd->zone_nr_blocks,
DMZ_BLOCK_SIZE_BITS);
/* Allocate zone array */
zmd->nr_zones = 0;
for (i = 0; i < zmd->nr_devs; i++) {
struct dmz_dev *dev = &zmd->dev[i];
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) {
DMERR("(%s): No zones found", zmd->devname);
return -ENXIO;
}
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) {
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 = dmz_get(zmd, 0);
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;
}
/*
* Get zone information and initialize zone descriptors. At the same
* time, determine where the super block should be: first block of the
* first randomly writable zone.
*/
ret = blkdev_report_zones(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;
}
static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx,
void *data)
{
struct dm_zone *zone = data;
clear_bit(DMZ_OFFLINE, &zone->flags);
clear_bit(DMZ_READ_ONLY, &zone->flags);
if (blkz->cond == BLK_ZONE_COND_OFFLINE)
set_bit(DMZ_OFFLINE, &zone->flags);
else if (blkz->cond == BLK_ZONE_COND_READONLY)
set_bit(DMZ_READ_ONLY, &zone->flags);
if (dmz_is_seq(zone))
zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start);
else
zone->wp_block = 0;
return 0;
}
/*
* Update a zone information.
*/
static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
{
struct dmz_dev *dev = zone->dev;
unsigned int noio_flag;
int ret;
if (dev->flags & DMZ_BDEV_REGULAR)
return 0;
/*
* Get zone information from disk. Since blkdev_report_zones() uses
* GFP_KERNEL by default for memory allocations, set the per-task
* PF_MEMALLOC_NOIO flag so that all allocations are done as if
* GFP_NOIO was specified.
*/
noio_flag = memalloc_noio_save();
ret = blkdev_report_zones(dev->bdev, dmz_start_sect(zmd, zone), 1,
dmz_update_zone_cb, zone);
memalloc_noio_restore(noio_flag);
if (ret == 0)
ret = -EIO;
if (ret < 0) {
dmz_dev_err(dev, "Get zone %u report failed",
zone->id);
dmz_check_bdev(dev);
return ret;
}
return 0;
}
/*
* Check a zone write pointer position when the zone is marked
* with the sequential write error flag.
*/
static int dmz_handle_seq_write_err(struct dmz_metadata *zmd,
struct dm_zone *zone)
{
struct dmz_dev *dev = zone->dev;
unsigned int wp = 0;
int ret;
wp = zone->wp_block;
ret = dmz_update_zone(zmd, zone);
if (ret)
return ret;
dmz_dev_warn(dev, "Processing zone %u write error (zone wp %u/%u)",
zone->id, zone->wp_block, wp);
if (zone->wp_block < wp) {
dmz_invalidate_blocks(zmd, zone, zone->wp_block,
wp - zone->wp_block);
}
return 0;
}
/*
* Reset a zone write pointer.
*/
static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
{
int ret;
/*
* Ignore offline zones, read only zones,
* and conventional zones.
*/
if (dmz_is_offline(zone) ||
dmz_is_readonly(zone) ||
dmz_is_rnd(zone))
return 0;
if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) {
struct dmz_dev *dev = zone->dev;
ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET,
dmz_start_sect(zmd, zone),
zmd->zone_nr_sectors, GFP_NOIO);
if (ret) {
dmz_dev_err(dev, "Reset zone %u failed %d",
zone->id, ret);
return ret;
}
}
/* Clear write error bit and rewind write pointer position */
clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags);
zone->wp_block = 0;
return 0;
}
static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone);
/*
* Initialize chunk mapping.
*/
static int dmz_load_mapping(struct dmz_metadata *zmd)
{
struct dm_zone *dzone, *bzone;
struct dmz_mblock *dmap_mblk = NULL;
struct dmz_map *dmap;
unsigned int i = 0, e = 0, chunk = 0;
unsigned int dzone_id;
unsigned int bzone_id;
/* Metadata block array for the chunk mapping table */
zmd->map_mblk = kcalloc(zmd->nr_map_blocks,
sizeof(struct dmz_mblk *), GFP_KERNEL);
if (!zmd->map_mblk)
return -ENOMEM;
/* Get chunk mapping table blocks and initialize zone mapping */
while (chunk < zmd->nr_chunks) {
if (!dmap_mblk) {
/* Get mapping block */
dmap_mblk = dmz_get_mblock(zmd, i + 1);
if (IS_ERR(dmap_mblk))
return PTR_ERR(dmap_mblk);
zmd->map_mblk[i] = dmap_mblk;
dmap = (struct dmz_map *) dmap_mblk->data;
i++;
e = 0;
}
/* Check data zone */
dzone_id = le32_to_cpu(dmap[e].dzone_id);
if (dzone_id == DMZ_MAP_UNMAPPED)
goto next;
if (dzone_id >= zmd->nr_zones) {
dmz_zmd_err(zmd, "Chunk %u mapping: invalid data zone ID %u",
chunk, dzone_id);
return -EIO;
}
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);
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, &dzone->dev->map_rnd_list);
else
list_add_tail(&dzone->link, &dzone->dev->map_seq_list);
/* Check buffer zone */
bzone_id = le32_to_cpu(dmap[e].bzone_id);
if (bzone_id == DMZ_MAP_UNMAPPED)
goto next;
if (bzone_id >= zmd->nr_zones) {
dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone ID %u",
chunk, bzone_id);
return -EIO;
}
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);
return -EIO;
}
set_bit(DMZ_DATA, &bzone->flags);
set_bit(DMZ_BUF, &bzone->flags);
bzone->chunk = chunk;
bzone->bzone = dzone;
dzone->bzone = bzone;
dmz_get_zone_weight(zmd, bzone);
if (dmz_is_cache(bzone))
list_add_tail(&bzone->link, &zmd->map_cache_list);
else
list_add_tail(&bzone->link, &bzone->dev->map_rnd_list);
next:
chunk++;
e++;
if (e >= DMZ_MAP_ENTRIES)
dmap_mblk = NULL;
}
/*
* At this point, only meta zones and mapped data zones were
* fully initialized. All remaining zones are unmapped data
* zones. Finish initializing those here.
*/
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))
continue;
if (dmz_is_cache(dzone))
zmd->nr_cache++;
else if (dmz_is_rnd(dzone))
dzone->dev->nr_rnd++;
else
dzone->dev->nr_seq++;
if (dmz_is_data(dzone)) {
/* Already initialized */
continue;
}
/* Unmapped data zone */
set_bit(DMZ_DATA, &dzone->flags);
dzone->chunk = DMZ_MAP_UNMAPPED;
if (dmz_is_cache(dzone)) {
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,
&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);
dzone->dev->nr_seq--;
} else {
list_add_tail(&dzone->link,
&dzone->dev->unmap_seq_list);
atomic_inc(&dzone->dev->unmap_nr_seq);
}
}
return 0;
}
/*
* Set a data chunk mapping.
*/
static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk,
unsigned int dzone_id, unsigned int bzone_id)
{
struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT];
struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data;
int map_idx = chunk & DMZ_MAP_ENTRIES_MASK;
dmap[map_idx].dzone_id = cpu_to_le32(dzone_id);
dmap[map_idx].bzone_id = cpu_to_le32(bzone_id);
dmz_dirty_mblock(zmd, dmap_mblk);
}
/*
* The list of mapped zones is maintained in LRU order.
* This rotates a zone at the end of its map list.
*/
static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
{
if (list_empty(&zone->link))
return;
list_del_init(&zone->link);
if (dmz_is_seq(zone)) {
/* LRU rotate sequential zone */
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, &zone->dev->map_rnd_list);
}
}
/*
* The list of mapped random zones is maintained
* in LRU order. This rotates a zone at the end of the list.
*/
static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
{
__dmz_lru_zone(zmd, zone);
if (zone->bzone)
__dmz_lru_zone(zmd, zone->bzone);
}
/*
* Wait for any zone to be freed.
*/
static void dmz_wait_for_free_zones(struct dmz_metadata *zmd)
{
DEFINE_WAIT(wait);
prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE);
dmz_unlock_map(zmd);
dmz_unlock_metadata(zmd);
io_schedule_timeout(HZ);
dmz_lock_metadata(zmd);
dmz_lock_map(zmd);
finish_wait(&zmd->free_wq, &wait);
}
/*
* Lock a zone for reclaim (set the zone RECLAIM bit).
* Returns false if the zone cannot be locked or if it is already locked
* and 1 otherwise.
*/
int dmz_lock_zone_reclaim(struct dm_zone *zone)
{
/* Active zones cannot be reclaimed */
if (dmz_is_active(zone))
return 0;
return !test_and_set_bit(DMZ_RECLAIM, &zone->flags);
}
/*
* Clear a zone reclaim flag.
*/
void dmz_unlock_zone_reclaim(struct dm_zone *zone)
{
WARN_ON(dmz_is_active(zone));
WARN_ON(!dmz_in_reclaim(zone));
clear_bit_unlock(DMZ_RECLAIM, &zone->flags);
smp_mb__after_atomic();
wake_up_bit(&zone->flags, DMZ_RECLAIM);
}
/*
* Wait for a zone reclaim to complete.
*/
static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone)
{
dmz_unlock_map(zmd);
dmz_unlock_metadata(zmd);
set_bit(DMZ_RECLAIM_TERMINATE, &zone->flags);
wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ);
clear_bit(DMZ_RECLAIM_TERMINATE, &zone->flags);
dmz_lock_metadata(zmd);
dmz_lock_map(zmd);
}
/*
* Select a cache or random write zone for reclaim.
*/
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, *maxw_z = NULL;
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->dev[idx].map_rnd_list;
} else
zone_list = &zmd->dev[idx].map_rnd_list;
/*
* Find the buffer zone with the heaviest weight or the first (oldest)
* data zone that can be reclaimed.
*/
list_for_each_entry(zone, zone_list, link) {
if (dmz_is_buf(zone)) {
dzone = zone->bzone;
if (dmz_is_rnd(dzone) && dzone->dev->dev_idx != idx)
continue;
if (!maxw_z || maxw_z->weight < dzone->weight)
maxw_z = dzone;
} else {
dzone = zone;
if (dmz_lock_zone_reclaim(dzone))
return dzone;
}
}
if (maxw_z && dmz_lock_zone_reclaim(maxw_z))
return maxw_z;
/*
* If we come here, none of the zones inspected could be locked for
* reclaim. Try again, being more aggressive, that is, find the
* first zone that can be reclaimed regardless of its weitght.
*/
list_for_each_entry(zone, zone_list, link) {
if (dmz_is_buf(zone)) {
dzone = zone->bzone;
if (dmz_is_rnd(dzone) && dzone->dev->dev_idx != idx)
continue;
} else
dzone = zone;
if (dmz_lock_zone_reclaim(dzone))
return dzone;
}
return NULL;
}
/*
* Select a buffered sequential zone for reclaim.
*/
static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd,
unsigned int idx)
{
struct dm_zone *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;
}
/*
* Select a zone for reclaim.
*/
struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd,
unsigned int dev_idx, bool idle)
{
struct dm_zone *zone = NULL;
/*
* Search for a zone candidate to reclaim: 2 cases are possible.
* (1) There is no free sequential zones. Then a random data zone
* cannot be reclaimed. So choose a sequential zone to reclaim so
* that afterward a random zone can be reclaimed.
* (2) At least one free sequential zone is available, then choose
* the oldest random zone (data or buffer) that can be locked.
*/
dmz_lock_map(zmd);
if (list_empty(&zmd->reserved_seq_zones_list))
zone = dmz_get_seq_zone_for_reclaim(zmd, dev_idx);
if (!zone)
zone = dmz_get_rnd_zone_for_reclaim(zmd, dev_idx, idle);
dmz_unlock_map(zmd);
return zone;
}
/*
* Get the zone mapping a chunk, if the chunk is mapped already.
* If no mapping exist and the operation is WRITE, a zone is
* allocated and used to map the chunk.
* The zone returned will be set to the active state.
*/
struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op)
{
struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT];
struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data;
int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK;
unsigned int dzone_id;
struct dm_zone *dzone = NULL;
int ret = 0;
int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND;
dmz_lock_map(zmd);
again:
/* Get the chunk mapping */
dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id);
if (dzone_id == DMZ_MAP_UNMAPPED) {
/*
* Read or discard in unmapped chunks are fine. But for
* writes, we need a mapping, so get one.
*/
if (op != REQ_OP_WRITE)
goto out;
/* Allocate a random zone */
dzone = dmz_alloc_zone(zmd, 0, alloc_flags);
if (!dzone) {
if (dmz_dev_is_dying(zmd)) {
dzone = ERR_PTR(-EIO);
goto out;
}
dmz_wait_for_free_zones(zmd);
goto again;
}
dmz_map_zone(zmd, dzone, chunk);
} 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;
}
/* Repair write pointer if the sequential dzone has error */
if (dmz_seq_write_err(dzone)) {
ret = dmz_handle_seq_write_err(zmd, dzone);
if (ret) {
dzone = ERR_PTR(-EIO);
goto out;
}
clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags);
}
}
/*
* If the zone is being reclaimed, the chunk mapping may change
* to a different zone. So wait for reclaim and retry. Otherwise,
* activate the zone (this will prevent reclaim from touching it).
*/
if (dmz_in_reclaim(dzone)) {
dmz_wait_for_reclaim(zmd, dzone);
goto again;
}
dmz_activate_zone(dzone);
dmz_lru_zone(zmd, dzone);
out:
dmz_unlock_map(zmd);
return dzone;
}
/*
* Write and discard change the block validity of data zones and their buffer
* zones. Check here that valid blocks are still present. If all blocks are
* invalid, the zones can be unmapped on the fly without waiting for reclaim
* to do it.
*/
void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone)
{
struct dm_zone *bzone;
dmz_lock_map(zmd);
bzone = dzone->bzone;
if (bzone) {
if (dmz_weight(bzone))
dmz_lru_zone(zmd, bzone);
else {
/* Empty buffer zone: reclaim it */
dmz_unmap_zone(zmd, bzone);
dmz_free_zone(zmd, bzone);
bzone = NULL;
}
}
/* Deactivate the data zone */
dmz_deactivate_zone(dzone);
if (dmz_is_active(dzone) || bzone || dmz_weight(dzone))
dmz_lru_zone(zmd, dzone);
else {
/* Unbuffered inactive empty data zone: reclaim it */
dmz_unmap_zone(zmd, dzone);
dmz_free_zone(zmd, dzone);
}
dmz_unlock_map(zmd);
}
/*
* Allocate and map a random zone to buffer a chunk
* already mapped to a sequential zone.
*/
struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
struct dm_zone *dzone)
{
struct dm_zone *bzone;
int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND;
dmz_lock_map(zmd);
again:
bzone = dzone->bzone;
if (bzone)
goto out;
/* Allocate a random zone */
bzone = dmz_alloc_zone(zmd, 0, alloc_flags);
if (!bzone) {
if (dmz_dev_is_dying(zmd)) {
bzone = ERR_PTR(-EIO);
goto out;
}
dmz_wait_for_free_zones(zmd);
goto again;
}
/* Update the chunk mapping */
dmz_set_chunk_mapping(zmd, dzone->chunk, dzone->id, bzone->id);
set_bit(DMZ_BUF, &bzone->flags);
bzone->chunk = dzone->chunk;
bzone->bzone = dzone;
dzone->bzone = bzone;
if (dmz_is_cache(bzone))
list_add_tail(&bzone->link, &zmd->map_cache_list);
else
list_add_tail(&bzone->link, &bzone->dev->map_rnd_list);
out:
dmz_unlock_map(zmd);
return bzone;
}
/*
* 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 int dev_idx,
unsigned long flags)
{
struct list_head *list;
struct dm_zone *zone;
int i = 0;
again:
if (flags & DMZ_ALLOC_CACHE)
list = &zmd->unmap_cache_list;
else if (flags & DMZ_ALLOC_RND)
list = &zmd->dev[dev_idx].unmap_rnd_list;
else
list = &zmd->dev[dev_idx].unmap_seq_list;
if (list_empty(list)) {
/*
* No free zone: return NULL if this is for not reclaim.
*/
if (!(flags & DMZ_ALLOC_RECLAIM))
return NULL;
/*
* Try to allocate from other devices
*/
if (i < zmd->nr_devs) {
dev_idx = (dev_idx + 1) % zmd->nr_devs;
i++;
goto again;
}
/*
* Fallback to the reserved sequential zones
*/
zone = list_first_entry_or_null(&zmd->reserved_seq_zones_list,
struct dm_zone, link);
if (zone) {
list_del_init(&zone->link);
atomic_dec(&zmd->nr_reserved_seq_zones);
}
return zone;
}
zone = list_first_entry(list, struct dm_zone, link);
list_del_init(&zone->link);
if (dmz_is_cache(zone))
atomic_dec(&zmd->unmap_nr_cache);
else if (dmz_is_rnd(zone))
atomic_dec(&zone->dev->unmap_nr_rnd);
else
atomic_dec(&zone->dev->unmap_nr_seq);
if (dmz_is_offline(zone)) {
dmz_zmd_warn(zmd, "Zone %u is offline", zone->id);
zone = NULL;
goto again;
}
if (dmz_is_meta(zone)) {
dmz_zmd_warn(zmd, "Zone %u has metadata", zone->id);
zone = NULL;
goto again;
}
return zone;
}
/*
* Free a zone.
* This must be called with the mapping lock held.
*/
void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
{
/* If this is a sequential zone, reset it */
if (dmz_is_seq(zone))
dmz_reset_zone(zmd, zone);
/* Return the zone to its type unmap list */
if (dmz_is_cache(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, &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, &zone->dev->unmap_seq_list);
atomic_inc(&zone->dev->unmap_nr_seq);
}
wake_up_all(&zmd->free_wq);
}
/*
* Map a chunk to a zone.
* This must be called with the mapping lock held.
*/
void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone,
unsigned int chunk)
{
/* Set the chunk mapping */
dmz_set_chunk_mapping(zmd, chunk, dzone->id,
DMZ_MAP_UNMAPPED);
dzone->chunk = chunk;
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, &dzone->dev->map_rnd_list);
else
list_add_tail(&dzone->link, &dzone->dev->map_seq_list);
}
/*
* Unmap a zone.
* This must be called with the mapping lock held.
*/
void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
{
unsigned int chunk = zone->chunk;
unsigned int dzone_id;
if (chunk == DMZ_MAP_UNMAPPED) {
/* Already unmapped */
return;
}
if (test_and_clear_bit(DMZ_BUF, &zone->flags)) {
/*
* Unmapping the chunk buffer zone: clear only
* the chunk buffer mapping
*/
dzone_id = zone->bzone->id;
zone->bzone->bzone = NULL;
zone->bzone = NULL;
} else {
/*
* Unmapping the chunk data zone: the zone must
* not be buffered.
*/
if (WARN_ON(zone->bzone)) {
zone->bzone->bzone = NULL;
zone->bzone = NULL;
}
dzone_id = DMZ_MAP_UNMAPPED;
}
dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED);
zone->chunk = DMZ_MAP_UNMAPPED;
list_del_init(&zone->link);
}
/*
* Set @nr_bits bits in @bitmap starting from @bit.
* Return the number of bits changed from 0 to 1.
*/
static unsigned int dmz_set_bits(unsigned long *bitmap,
unsigned int bit, unsigned int nr_bits)
{
unsigned long *addr;
unsigned int end = bit + nr_bits;
unsigned int n = 0;
while (bit < end) {
if (((bit & (BITS_PER_LONG - 1)) == 0) &&
((end - bit) >= BITS_PER_LONG)) {
/* Try to set the whole word at once */
addr = bitmap + BIT_WORD(bit);
if (*addr == 0) {
*addr = ULONG_MAX;
n += BITS_PER_LONG;
bit += BITS_PER_LONG;
continue;
}
}
if (!test_and_set_bit(bit, bitmap))
n++;
bit++;
}
return n;
}
/*
* Get the bitmap block storing the bit for chunk_block in zone.
*/
static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd,
struct dm_zone *zone,
sector_t chunk_block)
{
sector_t bitmap_block = 1 + zmd->nr_map_blocks +
(sector_t)(zone->id * zmd->zone_nr_bitmap_blocks) +
(chunk_block >> DMZ_BLOCK_SHIFT_BITS);
return dmz_get_mblock(zmd, bitmap_block);
}
/*
* Copy the valid blocks bitmap of from_zone to the bitmap of to_zone.
*/
int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
struct dm_zone *to_zone)
{
struct dmz_mblock *from_mblk, *to_mblk;
sector_t chunk_block = 0;
/* Get the zones bitmap blocks */
while (chunk_block < zmd->zone_nr_blocks) {
from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block);
if (IS_ERR(from_mblk))
return PTR_ERR(from_mblk);
to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block);
if (IS_ERR(to_mblk)) {
dmz_release_mblock(zmd, from_mblk);
return PTR_ERR(to_mblk);
}
memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE);
dmz_dirty_mblock(zmd, to_mblk);
dmz_release_mblock(zmd, to_mblk);
dmz_release_mblock(zmd, from_mblk);
chunk_block += zmd->zone_bits_per_mblk;
}
to_zone->weight = from_zone->weight;
return 0;
}
/*
* Merge the valid blocks bitmap of from_zone into the bitmap of to_zone,
* starting from chunk_block.
*/
int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
struct dm_zone *to_zone, sector_t chunk_block)
{
unsigned int nr_blocks;
int ret;
/* Get the zones bitmap blocks */
while (chunk_block < zmd->zone_nr_blocks) {
/* Get a valid region from the source zone */
ret = dmz_first_valid_block(zmd, from_zone, &chunk_block);
if (ret <= 0)
return ret;
nr_blocks = ret;
ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks);
if (ret)
return ret;
chunk_block += nr_blocks;
}
return 0;
}
/*
* Validate all the blocks in the range [block..block+nr_blocks-1].
*/
int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
sector_t chunk_block, unsigned int nr_blocks)
{
unsigned int count, bit, nr_bits;
unsigned int zone_nr_blocks = zmd->zone_nr_blocks;
struct dmz_mblock *mblk;
unsigned int n = 0;
dmz_zmd_debug(zmd, "=> VALIDATE zone %u, block %llu, %u blocks",
zone->id, (unsigned long long)chunk_block,
nr_blocks);
WARN_ON(chunk_block + nr_blocks > zone_nr_blocks);
while (nr_blocks) {
/* Get bitmap block */
mblk = dmz_get_bitmap(zmd, zone, chunk_block);
if (IS_ERR(mblk))
return PTR_ERR(mblk);
/* Set bits */
bit = chunk_block & DMZ_BLOCK_MASK_BITS;
nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits);
if (count) {
dmz_dirty_mblock(zmd, mblk);
n += count;
}
dmz_release_mblock(zmd, mblk);
nr_blocks -= nr_bits;
chunk_block += nr_bits;
}
if (likely(zone->weight + n <= zone_nr_blocks))
zone->weight += n;
else {
dmz_zmd_warn(zmd, "Zone %u: weight %u should be <= %u",
zone->id, zone->weight,
zone_nr_blocks - n);
zone->weight = zone_nr_blocks;
}
return 0;
}
/*
* Clear nr_bits bits in bitmap starting from bit.
* Return the number of bits cleared.
*/
static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits)
{
unsigned long *addr;
int end = bit + nr_bits;
int n = 0;
while (bit < end) {
if (((bit & (BITS_PER_LONG - 1)) == 0) &&
((end - bit) >= BITS_PER_LONG)) {
/* Try to clear whole word at once */
addr = bitmap + BIT_WORD(bit);
if (*addr == ULONG_MAX) {
*addr = 0;
n += BITS_PER_LONG;
bit += BITS_PER_LONG;
continue;
}
}
if (test_and_clear_bit(bit, bitmap))
n++;
bit++;
}
return n;
}
/*
* Invalidate all the blocks in the range [block..block+nr_blocks-1].
*/
int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
sector_t chunk_block, unsigned int nr_blocks)
{
unsigned int count, bit, nr_bits;
struct dmz_mblock *mblk;
unsigned int n = 0;
dmz_zmd_debug(zmd, "=> INVALIDATE zone %u, block %llu, %u blocks",
zone->id, (u64)chunk_block, nr_blocks);
WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks);
while (nr_blocks) {
/* Get bitmap block */
mblk = dmz_get_bitmap(zmd, zone, chunk_block);
if (IS_ERR(mblk))
return PTR_ERR(mblk);
/* Clear bits */
bit = chunk_block & DMZ_BLOCK_MASK_BITS;
nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
count = dmz_clear_bits((unsigned long *)mblk->data,
bit, nr_bits);
if (count) {
dmz_dirty_mblock(zmd, mblk);
n += count;
}
dmz_release_mblock(zmd, mblk);
nr_blocks -= nr_bits;
chunk_block += nr_bits;
}
if (zone->weight >= n)
zone->weight -= n;
else {
dmz_zmd_warn(zmd, "Zone %u: weight %u should be >= %u",
zone->id, zone->weight, n);
zone->weight = 0;
}
return 0;
}
/*
* Get a block bit value.
*/
static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone,
sector_t chunk_block)
{
struct dmz_mblock *mblk;
int ret;
WARN_ON(chunk_block >= zmd->zone_nr_blocks);
/* Get bitmap block */
mblk = dmz_get_bitmap(zmd, zone, chunk_block);
if (IS_ERR(mblk))
return PTR_ERR(mblk);
/* Get offset */
ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS,
(unsigned long *) mblk->data) != 0;
dmz_release_mblock(zmd, mblk);
return ret;
}
/*
* Return the number of blocks from chunk_block to the first block with a bit
* value specified by set. Search at most nr_blocks blocks from chunk_block.
*/
static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone,
sector_t chunk_block, unsigned int nr_blocks,
int set)
{
struct dmz_mblock *mblk;
unsigned int bit, set_bit, nr_bits;
unsigned int zone_bits = zmd->zone_bits_per_mblk;
unsigned long *bitmap;
int n = 0;
WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks);
while (nr_blocks) {
/* Get bitmap block */
mblk = dmz_get_bitmap(zmd, zone, chunk_block);
if (IS_ERR(mblk))
return PTR_ERR(mblk);
/* Get offset */
bitmap = (unsigned long *) mblk->data;
bit = chunk_block & DMZ_BLOCK_MASK_BITS;
nr_bits = min(nr_blocks, zone_bits - bit);
if (set)
set_bit = find_next_bit(bitmap, zone_bits, bit);
else
set_bit = find_next_zero_bit(bitmap, zone_bits, bit);
dmz_release_mblock(zmd, mblk);
n += set_bit - bit;
if (set_bit < zone_bits)
break;
nr_blocks -= nr_bits;
chunk_block += nr_bits;
}
return n;
}
/*
* Test if chunk_block is valid. If it is, the number of consecutive
* valid blocks from chunk_block will be returned.
*/
int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone,
sector_t chunk_block)
{
int valid;
valid = dmz_test_block(zmd, zone, chunk_block);
if (valid <= 0)
return valid;
/* The block is valid: get the number of valid blocks from block */
return dmz_to_next_set_block(zmd, zone, chunk_block,
zmd->zone_nr_blocks - chunk_block, 0);
}
/*
* Find the first valid block from @chunk_block in @zone.
* If such a block is found, its number is returned using
* @chunk_block and the total number of valid blocks from @chunk_block
* is returned.
*/
int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone,
sector_t *chunk_block)
{
sector_t start_block = *chunk_block;
int ret;
ret = dmz_to_next_set_block(zmd, zone, start_block,
zmd->zone_nr_blocks - start_block, 1);
if (ret < 0)
return ret;
start_block += ret;
*chunk_block = start_block;
return dmz_to_next_set_block(zmd, zone, start_block,
zmd->zone_nr_blocks - start_block, 0);
}
/*
* Count the number of bits set starting from bit up to bit + nr_bits - 1.
*/
static int dmz_count_bits(void *bitmap, int bit, int nr_bits)
{
unsigned long *addr;
int end = bit + nr_bits;
int n = 0;
while (bit < end) {
if (((bit & (BITS_PER_LONG - 1)) == 0) &&
((end - bit) >= BITS_PER_LONG)) {
addr = (unsigned long *)bitmap + BIT_WORD(bit);
if (*addr == ULONG_MAX) {
n += BITS_PER_LONG;
bit += BITS_PER_LONG;
continue;
}
}
if (test_bit(bit, bitmap))
n++;
bit++;
}
return n;
}
/*
* Get a zone weight.
*/
static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone)
{
struct dmz_mblock *mblk;
sector_t chunk_block = 0;
unsigned int bit, nr_bits;
unsigned int nr_blocks = zmd->zone_nr_blocks;
void *bitmap;
int n = 0;
while (nr_blocks) {
/* Get bitmap block */
mblk = dmz_get_bitmap(zmd, zone, chunk_block);
if (IS_ERR(mblk)) {
n = 0;
break;
}
/* Count bits in this block */
bitmap = mblk->data;
bit = chunk_block & DMZ_BLOCK_MASK_BITS;
nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
n += dmz_count_bits(bitmap, bit, nr_bits);
dmz_release_mblock(zmd, mblk);
nr_blocks -= nr_bits;
chunk_block += nr_bits;
}
zone->weight = n;
}
/*
* Cleanup the zoned metadata resources.
*/
static void dmz_cleanup_metadata(struct dmz_metadata *zmd)
{
struct rb_root *root;
struct dmz_mblock *mblk, *next;
int i;
/* Release zone mapping resources */
if (zmd->map_mblk) {
for (i = 0; i < zmd->nr_map_blocks; i++)
dmz_release_mblock(zmd, zmd->map_mblk[i]);
kfree(zmd->map_mblk);
zmd->map_mblk = NULL;
}
/* Release super blocks */
for (i = 0; i < 2; i++) {
if (zmd->sb[i].mblk) {
dmz_free_mblock(zmd, zmd->sb[i].mblk);
zmd->sb[i].mblk = NULL;
}
}
/* Free cached blocks */
while (!list_empty(&zmd->mblk_dirty_list)) {
mblk = list_first_entry(&zmd->mblk_dirty_list,
struct dmz_mblock, link);
dmz_zmd_warn(zmd, "mblock %llu still in dirty list (ref %u)",
(u64)mblk->no, mblk->ref);
list_del_init(&mblk->link);
rb_erase(&mblk->node, &zmd->mblk_rbtree);
dmz_free_mblock(zmd, mblk);
}
while (!list_empty(&zmd->mblk_lru_list)) {
mblk = list_first_entry(&zmd->mblk_lru_list,
struct dmz_mblock, link);
list_del_init(&mblk->link);
rb_erase(&mblk->node, &zmd->mblk_rbtree);
dmz_free_mblock(zmd, mblk);
}
/* Sanity checks: the mblock rbtree should now be empty */
root = &zmd->mblk_rbtree;
rbtree_postorder_for_each_entry_safe(mblk, next, root, node) {
dmz_zmd_warn(zmd, "mblock %llu ref %u still in rbtree",
(u64)mblk->no, mblk->ref);
mblk->ref = 0;
dmz_free_mblock(zmd, mblk);
}
/* Free the zone descriptors */
dmz_drop_zones(zmd);
mutex_destroy(&zmd->mblk_flush_lock);
mutex_destroy(&zmd->map_lock);
}
static void dmz_print_dev(struct dmz_metadata *zmd, int num)
{
struct dmz_dev *dev = &zmd->dev[num];
if (bdev_zoned_model(dev->bdev) == BLK_ZONED_NONE)
dmz_dev_info(dev, "Regular block device");
else
dmz_dev_info(dev, "Host-%s zoned block device",
bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ?
"aware" : "managed");
if (zmd->sb_version > 1) {
sector_t sector_offset =
dev->zone_offset << zmd->zone_nr_sectors_shift;
dmz_dev_info(dev, " %llu 512-byte logical sectors (offset %llu)",
(u64)dev->capacity, (u64)sector_offset);
dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors (offset %llu)",
dev->nr_zones, (u64)zmd->zone_nr_sectors,
(u64)dev->zone_offset);
} else {
dmz_dev_info(dev, " %llu 512-byte logical sectors",
(u64)dev->capacity);
dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors",
dev->nr_zones, (u64)zmd->zone_nr_sectors);
}
}
/*
* Initialize the zoned metadata.
*/
int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
struct dmz_metadata **metadata,
const char *devname)
{
struct dmz_metadata *zmd;
unsigned int i;
struct dm_zone *zone;
int ret;
zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL);
if (!zmd)
return -ENOMEM;
strcpy(zmd->devname, devname);
zmd->dev = dev;
zmd->nr_devs = num_dev;
zmd->mblk_rbtree = RB_ROOT;
init_rwsem(&zmd->mblk_sem);
mutex_init(&zmd->mblk_flush_lock);
spin_lock_init(&zmd->mblk_lock);
INIT_LIST_HEAD(&zmd->mblk_lru_list);
INIT_LIST_HEAD(&zmd->mblk_dirty_list);
mutex_init(&zmd->map_lock);
atomic_set(&zmd->unmap_nr_cache, 0);
INIT_LIST_HEAD(&zmd->unmap_cache_list);
INIT_LIST_HEAD(&zmd->map_cache_list);
atomic_set(&zmd->nr_reserved_seq_zones, 0);
INIT_LIST_HEAD(&zmd->reserved_seq_zones_list);
init_waitqueue_head(&zmd->free_wq);
/* Initialize zone descriptors */
ret = dmz_init_zones(zmd);
if (ret)
goto err;
/* Get super block */
ret = dmz_load_sb(zmd);
if (ret)
goto err;
/* 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);
ret = -ENXIO;
goto err;
}
set_bit(DMZ_META, &zone->flags);
}
/* Load mapping table */
ret = dmz_load_mapping(zmd);
if (ret)
goto err;
/*
* Cache size boundaries: allow at least 2 super blocks, the chunk map
* blocks and enough blocks to be able to cache the bitmap blocks of
* up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow
* the cache to add 512 more metadata blocks.
*/
zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16;
zmd->max_nr_mblks = zmd->min_nr_mblks + 512;
zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count;
zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan;
zmd->mblk_shrinker.seeks = DEFAULT_SEEKS;
/* Metadata cache shrinker */
ret = register_shrinker(&zmd->mblk_shrinker);
if (ret) {
dmz_zmd_err(zmd, "Register metadata cache shrinker failed");
goto err;
}
dmz_zmd_info(zmd, "DM-Zoned metadata version %d", zmd->sb_version);
for (i = 0; i < zmd->nr_devs; i++)
dmz_print_dev(zmd, i);
dmz_zmd_info(zmd, " %u zones of %llu 512-byte logical sectors",
zmd->nr_zones, (u64)zmd->zone_nr_sectors);
dmz_zmd_debug(zmd, " %u metadata zones",
zmd->nr_meta_zones * 2);
dmz_zmd_debug(zmd, " %u data zones for %u chunks",
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));
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:");
dmz_zmd_debug(zmd, "%u metadata blocks per set (%u max cache)",
zmd->nr_meta_blocks, zmd->max_nr_mblks);
dmz_zmd_debug(zmd, " %u data zone mapping blocks",
zmd->nr_map_blocks);
dmz_zmd_debug(zmd, " %u bitmap blocks",
zmd->nr_bitmap_blocks);
*metadata = zmd;
return 0;
err:
dmz_cleanup_metadata(zmd);
kfree(zmd);
*metadata = NULL;
return ret;
}
/*
* Cleanup the zoned metadata resources.
*/
void dmz_dtr_metadata(struct dmz_metadata *zmd)
{
unregister_shrinker(&zmd->mblk_shrinker);
dmz_cleanup_metadata(zmd);
kfree(zmd);
}
/*
* Check zone information on resume.
*/
int dmz_resume_metadata(struct dmz_metadata *zmd)
{
struct dm_zone *zone;
sector_t wp_block;
unsigned int i;
int ret;
/* Check zones */
for (i = 0; i < zmd->nr_zones; i++) {
zone = dmz_get(zmd, i);
if (!zone) {
dmz_zmd_err(zmd, "Unable to get zone %u", i);
return -EIO;
}
wp_block = zone->wp_block;
ret = dmz_update_zone(zmd, zone);
if (ret) {
dmz_zmd_err(zmd, "Broken zone %u", i);
return ret;
}
if (dmz_is_offline(zone)) {
dmz_zmd_warn(zmd, "Zone %u is offline", i);
continue;
}
/* Check write pointer */
if (!dmz_is_seq(zone))
zone->wp_block = 0;
else if (zone->wp_block != wp_block) {
dmz_zmd_err(zmd, "Zone %u: Invalid wp (%llu / %llu)",
i, (u64)zone->wp_block, (u64)wp_block);
zone->wp_block = wp_block;
dmz_invalidate_blocks(zmd, zone, zone->wp_block,
zmd->zone_nr_blocks - zone->wp_block);
}
}
return 0;
}
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