// 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>
#define DM_MSG_PREFIX "zoned"
#define DMZ_MIN_BIOS 8192
/*
* Zone BIO context.
*/
struct dmz_bioctx {
struct dmz_dev *dev;
struct dm_zone *zone;
struct bio *bio;
refcount_t ref;
};
/*
* Chunk work descriptor.
*/
struct dm_chunk_work {
struct work_struct work;
refcount_t refcount;
struct dmz_target *target;
unsigned int chunk;
struct bio_list bio_list;
};
/*
* Target descriptor.
*/
struct dmz_target {
struct dm_dev **ddev;
unsigned int nr_ddevs;
unsigned int flags;
/* Zoned block device information */
struct dmz_dev *dev;
/* For metadata handling */
struct dmz_metadata *metadata;
/* For chunk work */
struct radix_tree_root chunk_rxtree;
struct workqueue_struct *chunk_wq;
struct mutex chunk_lock;
/* For cloned BIOs to zones */
struct bio_set bio_set;
/* For flush */
spinlock_t flush_lock;
struct bio_list flush_list;
struct delayed_work flush_work;
struct workqueue_struct *flush_wq;
};
/*
* Flush intervals (seconds).
*/
#define DMZ_FLUSH_PERIOD (10 * HZ)
/*
* Target BIO completion.
*/
static inline void dmz_bio_endio(struct bio *bio, blk_status_t status)
{
struct dmz_bioctx *bioctx =
dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
if (status != BLK_STS_OK && bio->bi_status == BLK_STS_OK)
bio->bi_status = status;
if (bioctx->dev && bio->bi_status != BLK_STS_OK)
bioctx->dev->flags |= DMZ_CHECK_BDEV;
if (refcount_dec_and_test(&bioctx->ref)) {
struct dm_zone *zone = bioctx->zone;
if (zone) {
if (bio->bi_status != BLK_STS_OK &&
bio_op(bio) == REQ_OP_WRITE &&
dmz_is_seq(zone))
set_bit(DMZ_SEQ_WRITE_ERR, &zone->flags);
dmz_deactivate_zone(zone);
}
bio_endio(bio);
}
}
/*
* Completion callback for an internally cloned target BIO. This terminates the
* target BIO when there are no more references to its context.
*/
static void dmz_clone_endio(struct bio *clone)
{
struct dmz_bioctx *bioctx = clone->bi_private;
blk_status_t status = clone->bi_status;
bio_put(clone);
dmz_bio_endio(bioctx->bio, status);
}
/*
* Issue a clone of a target BIO. The clone may only partially process the
* original target BIO.
*/
static int dmz_submit_bio(struct dmz_target *dmz, struct dm_zone *zone,
struct bio *bio, sector_t chunk_block,
unsigned int nr_blocks)
{
struct dmz_bioctx *bioctx =
dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
struct dmz_dev *dev = zone->dev;
struct bio *clone;
if (dev->flags & DMZ_BDEV_DYING)
return -EIO;
clone = bio_alloc_clone(dev->bdev, bio, GFP_NOIO, &dmz->bio_set);
if (!clone)
return -ENOMEM;
bioctx->dev = dev;
clone->bi_iter.bi_sector =
dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block);
clone->bi_iter.bi_size = dmz_blk2sect(nr_blocks) << SECTOR_SHIFT;
clone->bi_end_io = dmz_clone_endio;
clone->bi_private = bioctx;
bio_advance(bio, clone->bi_iter.bi_size);
refcount_inc(&bioctx->ref);
submit_bio_noacct(clone);
if (bio_op(bio) == REQ_OP_WRITE && dmz_is_seq(zone))
zone->wp_block += nr_blocks;
return 0;
}
/*
* Zero out pages of discarded blocks accessed by a read BIO.
*/
static void dmz_handle_read_zero(struct dmz_target *dmz, struct bio *bio,
sector_t chunk_block, unsigned int nr_blocks)
{
unsigned int size = nr_blocks << DMZ_BLOCK_SHIFT;
/* Clear nr_blocks */
swap(bio->bi_iter.bi_size, size);
zero_fill_bio(bio);
swap(bio->bi_iter.bi_size, size);
bio_advance(bio, size);
}
/*
* Process a read BIO.
*/
static int dmz_handle_read(struct dmz_target *dmz, struct dm_zone *zone,
struct bio *bio)
{
struct dmz_metadata *zmd = dmz->metadata;
sector_t chunk_block = dmz_chunk_block(zmd, dmz_bio_block(bio));
unsigned int nr_blocks = dmz_bio_blocks(bio);
sector_t end_block = chunk_block + nr_blocks;
struct dm_zone *rzone, *bzone;
int ret;
/* Read into unmapped chunks need only zeroing the BIO buffer */
if (!zone) {
zero_fill_bio(bio);
return 0;
}
DMDEBUG("(%s): READ chunk %llu -> %s zone %u, block %llu, %u blocks",
dmz_metadata_label(zmd),
(unsigned long long)dmz_bio_chunk(zmd, bio),
(dmz_is_rnd(zone) ? "RND" :
(dmz_is_cache(zone) ? "CACHE" : "SEQ")),
zone->id,
(unsigned long long)chunk_block, nr_blocks);
/* Check block validity to determine the read location */
bzone = zone->bzone;
while (chunk_block < end_block) {
nr_blocks = 0;
if (dmz_is_rnd(zone) || dmz_is_cache(zone) ||
chunk_block < zone->wp_block) {
/* Test block validity in the data zone */
ret = dmz_block_valid(zmd, zone, chunk_block);
if (ret < 0)
return ret;
if (ret > 0) {
/* Read data zone blocks */
nr_blocks = ret;
rzone = zone;
}
}
/*
* No valid blocks found in the data zone.
* Check the buffer zone, if there is one.
*/
if (!nr_blocks && bzone) {
ret = dmz_block_valid(zmd, bzone, chunk_block);
if (ret < 0)
return ret;
if (ret > 0) {
/* Read buffer zone blocks */
nr_blocks = ret;
rzone = bzone;
}
}
if (nr_blocks) {
/* Valid blocks found: read them */
nr_blocks = min_t(unsigned int, nr_blocks,
end_block - chunk_block);
ret = dmz_submit_bio(dmz, rzone, bio,
chunk_block, nr_blocks);
if (ret)
return ret;
chunk_block += nr_blocks;
} else {
/* No valid block: zeroout the current BIO block */
dmz_handle_read_zero(dmz, bio, chunk_block, 1);
chunk_block++;
}
}
return 0;
}
/*
* Write blocks directly in a data zone, at the write pointer.
* If a buffer zone is assigned, invalidate the blocks written
* in place.
*/
static int dmz_handle_direct_write(struct dmz_target *dmz,
struct dm_zone *zone, struct bio *bio,
sector_t chunk_block,
unsigned int nr_blocks)
{
struct dmz_metadata *zmd = dmz->metadata;
struct dm_zone *bzone = zone->bzone;
int ret;
if (dmz_is_readonly(zone))
return -EROFS;
/* Submit write */
ret = dmz_submit_bio(dmz, zone, bio, chunk_block, nr_blocks);
if (ret)
return ret;
/*
* Validate the blocks in the data zone and invalidate
* in the buffer zone, if there is one.
*/
ret = dmz_validate_blocks(zmd, zone, chunk_block, nr_blocks);
if (ret == 0 && bzone)
ret = dmz_invalidate_blocks(zmd, bzone, chunk_block, nr_blocks);
return ret;
}
/*
* Write blocks in the buffer zone of @zone.
* If no buffer zone is assigned yet, get one.
* Called with @zone write locked.
*/
static int dmz_handle_buffered_write(struct dmz_target *dmz,
struct dm_zone *zone, struct bio *bio,
sector_t chunk_block,
unsigned int nr_blocks)
{
struct dmz_metadata *zmd = dmz->metadata;
struct dm_zone *bzone;
int ret;
/* Get the buffer zone. One will be allocated if needed */
bzone = dmz_get_chunk_buffer(zmd, zone);
if (IS_ERR(bzone))
return PTR_ERR(bzone);
if (dmz_is_readonly(bzone))
return -EROFS;
/* Submit write */
ret = dmz_submit_bio(dmz, bzone, bio, chunk_block, nr_blocks);
if (ret)
return ret;
/*
* Validate the blocks in the buffer zone
* and invalidate in the data zone.
*/
ret = dmz_validate_blocks(zmd, bzone, chunk_block, nr_blocks);
if (ret == 0 && chunk_block < zone->wp_block)
ret = dmz_invalidate_blocks(zmd, zone, chunk_block, nr_blocks);
return ret;
}
/*
* Process a write BIO.
*/
static int dmz_handle_write(struct dmz_target *dmz, struct dm_zone *zone,
struct bio *bio)
{
struct dmz_metadata *zmd = dmz->metadata;
sector_t chunk_block = dmz_chunk_block(zmd, dmz_bio_block(bio));
unsigned int nr_blocks = dmz_bio_blocks(bio);
if (!zone)
return -ENOSPC;
DMDEBUG("(%s): WRITE chunk %llu -> %s zone %u, block %llu, %u blocks",
dmz_metadata_label(zmd),
(unsigned long long)dmz_bio_chunk(zmd, bio),
(dmz_is_rnd(zone) ? "RND" :
(dmz_is_cache(zone) ? "CACHE" : "SEQ")),
zone->id,
(unsigned long long)chunk_block, nr_blocks);
if (dmz_is_rnd(zone) || dmz_is_cache(zone) ||
chunk_block == zone->wp_block) {
/*
* zone is a random zone or it is a sequential zone
* and the BIO is aligned to the zone write pointer:
* direct write the zone.
*/
return dmz_handle_direct_write(dmz, zone, bio,
chunk_block, nr_blocks);
}
/*
* This is an unaligned write in a sequential zone:
* use buffered write.
*/
return dmz_handle_buffered_write(dmz, zone, bio, chunk_block, nr_blocks);
}
/*
* Process a discard BIO.
*/
static int dmz_handle_discard(struct dmz_target *dmz, struct dm_zone *zone,
struct bio *bio)
{
struct dmz_metadata *zmd = dmz->metadata;
sector_t block = dmz_bio_block(bio);
unsigned int nr_blocks = dmz_bio_blocks(bio);
sector_t chunk_block = dmz_chunk_block(zmd, block);
int ret = 0;
/* For unmapped chunks, there is nothing to do */
if (!zone)
return 0;
if (dmz_is_readonly(zone))
return -EROFS;
DMDEBUG("(%s): DISCARD chunk %llu -> zone %u, block %llu, %u blocks",
dmz_metadata_label(dmz->metadata),
(unsigned long long)dmz_bio_chunk(zmd, bio),
zone->id,
(unsigned long long)chunk_block, nr_blocks);
/*
* Invalidate blocks in the data zone and its
* buffer zone if one is mapped.
*/
if (dmz_is_rnd(zone) || dmz_is_cache(zone) ||
chunk_block < zone->wp_block)
ret = dmz_invalidate_blocks(zmd, zone, chunk_block, nr_blocks);
if (ret == 0 && zone->bzone)
ret = dmz_invalidate_blocks(zmd, zone->bzone,
chunk_block, nr_blocks);
return ret;
}
/*
* Process a BIO.
*/
static void dmz_handle_bio(struct dmz_target *dmz, struct dm_chunk_work *cw,
struct bio *bio)
{
struct dmz_bioctx *bioctx =
dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
struct dmz_metadata *zmd = dmz->metadata;
struct dm_zone *zone;
int ret;
dmz_lock_metadata(zmd);
/*
* Get the data zone mapping the chunk. There may be no
* mapping for read and discard. If a mapping is obtained,
+ the zone returned will be set to active state.
*/
zone = dmz_get_chunk_mapping(zmd, dmz_bio_chunk(zmd, bio),
bio_op(bio));
if (IS_ERR(zone)) {
ret = PTR_ERR(zone);
goto out;
}
/* Process the BIO */
if (zone) {
dmz_activate_zone(zone);
bioctx->zone = zone;
dmz_reclaim_bio_acc(zone->dev->reclaim);
}
switch (bio_op(bio)) {
case REQ_OP_READ:
ret = dmz_handle_read(dmz, zone, bio);
break;
case REQ_OP_WRITE:
ret = dmz_handle_write(dmz, zone, bio);
break;
case REQ_OP_DISCARD:
case REQ_OP_WRITE_ZEROES:
ret = dmz_handle_discard(dmz, zone, bio);
break;
default:
DMERR("(%s): Unsupported BIO operation 0x%x",
dmz_metadata_label(dmz->metadata), bio_op(bio));
ret = -EIO;
}
/*
* Release the chunk mapping. This will check that the mapping
* is still valid, that is, that the zone used still has valid blocks.
*/
if (zone)
dmz_put_chunk_mapping(zmd, zone);
out:
dmz_bio_endio(bio, errno_to_blk_status(ret));
dmz_unlock_metadata(zmd);
}
/*
* Increment a chunk reference counter.
*/
static inline void dmz_get_chunk_work(struct dm_chunk_work *cw)
{
refcount_inc(&cw->refcount);
}
/*
* Decrement a chunk work reference count and
* free it if it becomes 0.
*/
static void dmz_put_chunk_work(struct dm_chunk_work *cw)
{
if (refcount_dec_and_test(&cw->refcount)) {
WARN_ON(!bio_list_empty(&cw->bio_list));
radix_tree_delete(&cw->target->chunk_rxtree, cw->chunk);
kfree(cw);
}
}
/*
* Chunk BIO work function.
*/
static void dmz_chunk_work(struct work_struct *work)
{
struct dm_chunk_work *cw = container_of(work, struct dm_chunk_work, work);
struct dmz_target *dmz = cw->target;
struct bio *bio;
mutex_lock(&dmz->chunk_lock);
/* Process the chunk BIOs */
while ((bio = bio_list_pop(&cw->bio_list))) {
mutex_unlock(&dmz->chunk_lock);
dmz_handle_bio(dmz, cw, bio);
mutex_lock(&dmz->chunk_lock);
dmz_put_chunk_work(cw);
}
/* Queueing the work incremented the work refcount */
dmz_put_chunk_work(cw);
mutex_unlock(&dmz->chunk_lock);
}
/*
* Flush work.
*/
static void dmz_flush_work(struct work_struct *work)
{
struct dmz_target *dmz = container_of(work, struct dmz_target, flush_work.work);
struct bio *bio;
int ret;
/* Flush dirty metadata blocks */
ret = dmz_flush_metadata(dmz->metadata);
if (ret)
DMDEBUG("(%s): Metadata flush failed, rc=%d",
dmz_metadata_label(dmz->metadata), ret);
/* Process queued flush requests */
while (1) {
spin_lock(&dmz->flush_lock);
bio = bio_list_pop(&dmz->flush_list);
spin_unlock(&dmz->flush_lock);
if (!bio)
break;
dmz_bio_endio(bio, errno_to_blk_status(ret));
}
queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
}
/*
* Get a chunk work and start it to process a new BIO.
* If the BIO chunk has no work yet, create one.
*/
static int dmz_queue_chunk_work(struct dmz_target *dmz, struct bio *bio)
{
unsigned int chunk = dmz_bio_chunk(dmz->metadata, bio);
struct dm_chunk_work *cw;
int ret = 0;
mutex_lock(&dmz->chunk_lock);
/* Get the BIO chunk work. If one is not active yet, create one */
cw = radix_tree_lookup(&dmz->chunk_rxtree, chunk);
if (cw) {
dmz_get_chunk_work(cw);
} else {
/* Create a new chunk work */
cw = kmalloc(sizeof(struct dm_chunk_work), GFP_NOIO);
if (unlikely(!cw)) {
ret = -ENOMEM;
goto out;
}
INIT_WORK(&cw->work, dmz_chunk_work);
refcount_set(&cw->refcount, 1);
cw->target = dmz;
cw->chunk = chunk;
bio_list_init(&cw->bio_list);
ret = radix_tree_insert(&dmz->chunk_rxtree, chunk, cw);
if (unlikely(ret)) {
kfree(cw);
goto out;
}
}
bio_list_add(&cw->bio_list, bio);
if (queue_work(dmz->chunk_wq, &cw->work))
dmz_get_chunk_work(cw);
out:
mutex_unlock(&dmz->chunk_lock);
return ret;
}
/*
* Check if the backing device is being removed. If it's on the way out,
* start failing I/O. Reclaim and metadata components also call this
* function to cleanly abort operation in the event of such failure.
*/
bool dmz_bdev_is_dying(struct dmz_dev *dmz_dev)
{
if (dmz_dev->flags & DMZ_BDEV_DYING)
return true;
if (dmz_dev->flags & DMZ_CHECK_BDEV)
return !dmz_check_bdev(dmz_dev);
if (blk_queue_dying(bdev_get_queue(dmz_dev->bdev))) {
dmz_dev_warn(dmz_dev, "Backing device queue dying");
dmz_dev->flags |= DMZ_BDEV_DYING;
}
return dmz_dev->flags & DMZ_BDEV_DYING;
}
/*
* Check the backing device availability. This detects such events as
* backing device going offline due to errors, media removals, etc.
* This check is less efficient than dmz_bdev_is_dying() and should
* only be performed as a part of error handling.
*/
bool dmz_check_bdev(struct dmz_dev *dmz_dev)
{
struct gendisk *disk;
dmz_dev->flags &= ~DMZ_CHECK_BDEV;
if (dmz_bdev_is_dying(dmz_dev))
return false;
disk = dmz_dev->bdev->bd_disk;
if (disk->fops->check_events &&
disk->fops->check_events(disk, 0) & DISK_EVENT_MEDIA_CHANGE) {
dmz_dev_warn(dmz_dev, "Backing device offline");
dmz_dev->flags |= DMZ_BDEV_DYING;
}
return !(dmz_dev->flags & DMZ_BDEV_DYING);
}
/*
* Process a new BIO.
*/
static int dmz_map(struct dm_target *ti, struct bio *bio)
{
struct dmz_target *dmz = ti->private;
struct dmz_metadata *zmd = dmz->metadata;
struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
sector_t sector = bio->bi_iter.bi_sector;
unsigned int nr_sectors = bio_sectors(bio);
sector_t chunk_sector;
int ret;
if (dmz_dev_is_dying(zmd))
return DM_MAPIO_KILL;
DMDEBUG("(%s): BIO op %d sector %llu + %u => chunk %llu, block %llu, %u blocks",
dmz_metadata_label(zmd),
bio_op(bio), (unsigned long long)sector, nr_sectors,
(unsigned long long)dmz_bio_chunk(zmd, bio),
(unsigned long long)dmz_chunk_block(zmd, dmz_bio_block(bio)),
(unsigned int)dmz_bio_blocks(bio));
if (!nr_sectors && bio_op(bio) != REQ_OP_WRITE)
return DM_MAPIO_REMAPPED;
/* The BIO should be block aligned */
if ((nr_sectors & DMZ_BLOCK_SECTORS_MASK) || (sector & DMZ_BLOCK_SECTORS_MASK))
return DM_MAPIO_KILL;
/* Initialize the BIO context */
bioctx->dev = NULL;
bioctx->zone = NULL;
bioctx->bio = bio;
refcount_set(&bioctx->ref, 1);
/* Set the BIO pending in the flush list */
if (!nr_sectors && bio_op(bio) == REQ_OP_WRITE) {
spin_lock(&dmz->flush_lock);
bio_list_add(&dmz->flush_list, bio);
spin_unlock(&dmz->flush_lock);
mod_delayed_work(dmz->flush_wq, &dmz->flush_work, 0);
return DM_MAPIO_SUBMITTED;
}
/* Split zone BIOs to fit entirely into a zone */
chunk_sector = sector & (dmz_zone_nr_sectors(zmd) - 1);
if (chunk_sector + nr_sectors > dmz_zone_nr_sectors(zmd))
dm_accept_partial_bio(bio, dmz_zone_nr_sectors(zmd) - chunk_sector);
/* Now ready to handle this BIO */
ret = dmz_queue_chunk_work(dmz, bio);
if (ret) {
DMDEBUG("(%s): BIO op %d, can't process chunk %llu, err %i",
dmz_metadata_label(zmd),
bio_op(bio), (u64)dmz_bio_chunk(zmd, bio),
ret);
return DM_MAPIO_REQUEUE;
}
return DM_MAPIO_SUBMITTED;
}
/*
* Get zoned device information.
*/
static int dmz_get_zoned_device(struct dm_target *ti, char *path,
int idx, int nr_devs)
{
struct dmz_target *dmz = ti->private;
struct dm_dev *ddev;
struct dmz_dev *dev;
int ret;
struct block_device *bdev;
/* Get the target device */
ret = dm_get_device(ti, path, dm_table_get_mode(ti->table), &ddev);
if (ret) {
ti->error = "Get target device failed";
return ret;
}
bdev = ddev->bdev;
if (!bdev_is_zoned(bdev)) {
if (nr_devs == 1) {
ti->error = "Invalid regular device";
goto err;
}
if (idx != 0) {
ti->error = "First device must be a regular device";
goto err;
}
if (dmz->ddev[0]) {
ti->error = "Too many regular devices";
goto err;
}
dev = &dmz->dev[idx];
dev->flags = DMZ_BDEV_REGULAR;
} else {
if (dmz->ddev[idx]) {
ti->error = "Too many zoned devices";
goto err;
}
if (nr_devs > 1 && idx == 0) {
ti->error = "First device must be a regular device";
goto err;
}
dev = &dmz->dev[idx];
}
dev->bdev = bdev;
dev->dev_idx = idx;
dev->capacity = bdev_nr_sectors(bdev);
if (ti->begin) {
ti->error = "Partial mapping is not supported";
goto err;
}
dmz->ddev[idx] = ddev;
return 0;
err:
dm_put_device(ti, ddev);
return -EINVAL;
}
/*
* Cleanup zoned device information.
*/
static void dmz_put_zoned_devices(struct dm_target *ti)
{
struct dmz_target *dmz = ti->private;
int i;
for (i = 0; i < dmz->nr_ddevs; i++)
if (dmz->ddev[i])
dm_put_device(ti, dmz->ddev[i]);
kfree(dmz->ddev);
}
static int dmz_fixup_devices(struct dm_target *ti)
{
struct dmz_target *dmz = ti->private;
struct dmz_dev *reg_dev = NULL;
sector_t zone_nr_sectors = 0;
int i;
/*
* When we have more than on devices, the first one must be a
* regular block device and the others zoned block devices.
*/
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;
}
for (i = 1; i < dmz->nr_ddevs; i++) {
struct dmz_dev *zoned_dev = &dmz->dev[i];
struct block_device *bdev = zoned_dev->bdev;
if (zoned_dev->flags & DMZ_BDEV_REGULAR) {
ti->error = "Secondary disk is not a zoned device";
return -EINVAL;
}
if (zone_nr_sectors &&
zone_nr_sectors != bdev_zone_sectors(bdev)) {
ti->error = "Zone nr sectors mismatch";
return -EINVAL;
}
zone_nr_sectors = bdev_zone_sectors(bdev);
zoned_dev->zone_nr_sectors = zone_nr_sectors;
zoned_dev->nr_zones = bdev_nr_zones(bdev);
}
} else {
struct dmz_dev *zoned_dev = &dmz->dev[0];
struct block_device *bdev = zoned_dev->bdev;
if (zoned_dev->flags & DMZ_BDEV_REGULAR) {
ti->error = "Disk is not a zoned device";
return -EINVAL;
}
zoned_dev->zone_nr_sectors = bdev_zone_sectors(bdev);
zoned_dev->nr_zones = bdev_nr_zones(bdev);
}
if (reg_dev) {
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);
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;
}
/*
* Setup target.
*/
static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct dmz_target *dmz;
int ret, i;
/* Check arguments */
if (argc < 1) {
ti->error = "Invalid argument count";
return -EINVAL;
}
/* Allocate and initialize the target descriptor */
dmz = kzalloc(sizeof(struct dmz_target), GFP_KERNEL);
if (!dmz) {
ti->error = "Unable to allocate the zoned target descriptor";
return -ENOMEM;
}
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 */
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)
goto err_dev;
/* Initialize metadata */
ret = dmz_ctr_metadata(dmz->dev, argc, &dmz->metadata,
dm_table_device_name(ti->table));
if (ret) {
ti->error = "Metadata initialization failed";
goto err_dev;
}
/* Set target (no write same support) */
ti->max_io_len = dmz_zone_nr_sectors(dmz->metadata);
ti->num_flush_bios = 1;
ti->num_discard_bios = 1;
ti->num_write_zeroes_bios = 1;
ti->per_io_data_size = sizeof(struct dmz_bioctx);
ti->flush_supported = true;
ti->discards_supported = true;
/* The exposed capacity is the number of chunks that can be mapped */
ti->len = (sector_t)dmz_nr_chunks(dmz->metadata) <<
dmz_zone_nr_sectors_shift(dmz->metadata);
/* Zone BIO */
ret = bioset_init(&dmz->bio_set, DMZ_MIN_BIOS, 0, 0);
if (ret) {
ti->error = "Create BIO set failed";
goto err_meta;
}
/* Chunk BIO work */
mutex_init(&dmz->chunk_lock);
INIT_RADIX_TREE(&dmz->chunk_rxtree, GFP_NOIO);
dmz->chunk_wq = alloc_workqueue("dmz_cwq_%s",
WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
dmz_metadata_label(dmz->metadata));
if (!dmz->chunk_wq) {
ti->error = "Create chunk workqueue failed";
ret = -ENOMEM;
goto err_bio;
}
/* Flush work */
spin_lock_init(&dmz->flush_lock);
bio_list_init(&dmz->flush_list);
INIT_DELAYED_WORK(&dmz->flush_work, dmz_flush_work);
dmz->flush_wq = alloc_ordered_workqueue("dmz_fwq_%s", WQ_MEM_RECLAIM,
dmz_metadata_label(dmz->metadata));
if (!dmz->flush_wq) {
ti->error = "Create flush workqueue failed";
ret = -ENOMEM;
goto err_cwq;
}
mod_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
/* Initialize reclaim */
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)",
dmz_metadata_label(dmz->metadata),
(unsigned long long)ti->len,
(unsigned long long)dmz_sect2blk(ti->len));
return 0;
err_fwq:
destroy_workqueue(dmz->flush_wq);
err_cwq:
destroy_workqueue(dmz->chunk_wq);
err_bio:
mutex_destroy(&dmz->chunk_lock);
bioset_exit(&dmz->bio_set);
err_meta:
dmz_dtr_metadata(dmz->metadata);
err_dev:
dmz_put_zoned_devices(ti);
err:
kfree(dmz->dev);
kfree(dmz);
return ret;
}
/*
* Cleanup target.
*/
static void dmz_dtr(struct dm_target *ti)
{
struct dmz_target *dmz = ti->private;
int i;
destroy_workqueue(dmz->chunk_wq);
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);
(void) dmz_flush_metadata(dmz->metadata);
dmz_dtr_metadata(dmz->metadata);
bioset_exit(&dmz->bio_set);
dmz_put_zoned_devices(ti);
mutex_destroy(&dmz->chunk_lock);
kfree(dmz->dev);
kfree(dmz);
}
/*
* Setup target request queue limits.
*/
static void dmz_io_hints(struct dm_target *ti, struct queue_limits *limits)
{
struct dmz_target *dmz = ti->private;
unsigned int chunk_sectors = dmz_zone_nr_sectors(dmz->metadata);
limits->logical_block_size = DMZ_BLOCK_SIZE;
limits->physical_block_size = DMZ_BLOCK_SIZE;
limits->io_min = DMZ_BLOCK_SIZE;
limits->io_opt = DMZ_BLOCK_SIZE;
limits->discard_alignment = 0;
limits->discard_granularity = DMZ_BLOCK_SIZE;
limits->max_hw_discard_sectors = chunk_sectors;
limits->max_write_zeroes_sectors = chunk_sectors;
/* FS hint to try to align to the device zone size */
limits->chunk_sectors = chunk_sectors;
limits->max_sectors = chunk_sectors;
/* We are exposing a drive-managed zoned block device */
limits->features &= ~BLK_FEAT_ZONED;
}
/*
* Pass on ioctl to the backend device.
*/
static int dmz_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
{
struct dmz_target *dmz = ti->private;
struct dmz_dev *dev = &dmz->dev[0];
if (!dmz_check_bdev(dev))
return -EIO;
*bdev = dev->bdev;
return 0;
}
/*
* Stop works on suspend.
*/
static void dmz_suspend(struct dm_target *ti)
{
struct dmz_target *dmz = ti->private;
int i;
flush_workqueue(dmz->chunk_wq);
for (i = 0; i < dmz->nr_ddevs; i++)
dmz_suspend_reclaim(dmz->dev[i].reclaim);
cancel_delayed_work_sync(&dmz->flush_work);
}
/*
* Restart works on resume or if suspend failed.
*/
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);
for (i = 0; i < dmz->nr_ddevs; i++)
dmz_resume_reclaim(dmz->dev[i].reclaim);
}
static int dmz_iterate_devices(struct dm_target *ti,
iterate_devices_callout_fn fn, void *data)
{
struct dmz_target *dmz = ti->private;
unsigned int zone_nr_sectors = dmz_zone_nr_sectors(dmz->metadata);
sector_t capacity;
int i, r;
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;
}
static void dmz_status(struct dm_target *ti, status_type_t type,
unsigned int status_flags, char *result,
unsigned int maxlen)
{
struct dmz_target *dmz = ti->private;
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",
dmz_nr_zones(dmz->metadata),
dmz_nr_unmap_cache_zones(dmz->metadata),
dmz_nr_cache_zones(dmz->metadata));
for (i = 0; i < dmz->nr_ddevs; i++) {
/*
* 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];
format_dev_t(buf, dev->bdev->bd_dev);
DMEMIT("%s", buf);
for (i = 1; i < dmz->nr_ddevs; i++) {
dev = &dmz->dev[i];
format_dev_t(buf, dev->bdev->bd_dev);
DMEMIT(" %s", buf);
}
break;
case STATUSTYPE_IMA:
*result = '\0';
break;
}
}
static int dmz_message(struct dm_target *ti, unsigned int argc, char **argv,
char *result, unsigned int maxlen)
{
struct dmz_target *dmz = ti->private;
int r = -EINVAL;
if (!strcasecmp(argv[0], "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]);
return r;
}
static struct target_type zoned_target = {
.name = "zoned",
.version = {2, 0, 0},
.features = DM_TARGET_SINGLETON | DM_TARGET_MIXED_ZONED_MODEL,
.module = THIS_MODULE,
.ctr = dmz_ctr,
.dtr = dmz_dtr,
.map = dmz_map,
.io_hints = dmz_io_hints,
.prepare_ioctl = dmz_prepare_ioctl,
.postsuspend = dmz_suspend,
.resume = dmz_resume,
.iterate_devices = dmz_iterate_devices,
.status = dmz_status,
.message = dmz_message,
};
module_dm(zoned);
MODULE_DESCRIPTION(DM_NAME " target for zoned block devices");
MODULE_AUTHOR("Damien Le Moal <[email protected]>");
MODULE_LICENSE("GPL");
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