blob: ee0510f9a85e9f36eb10d309bd2962ae3cfa0c2b [file] [log] [blame]
/*
* Copyright (C) 2012 Red Hat. All rights reserved.
*
* This file is released under the GPL.
*/
#include "dm.h"
#include "dm-bio-prison.h"
#include "dm-bio-record.h"
#include "dm-cache-metadata.h"
#include <linux/dm-io.h>
#include <linux/dm-kcopyd.h>
#include <linux/jiffies.h>
#include <linux/init.h>
#include <linux/mempool.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#define DM_MSG_PREFIX "cache"
DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(cache_copy_throttle,
"A percentage of time allocated for copying to and/or from cache");
/*----------------------------------------------------------------*/
#define IOT_RESOLUTION 4
struct io_tracker {
spinlock_t lock;
/*
* Sectors of in-flight IO.
*/
sector_t in_flight;
/*
* The time, in jiffies, when this device became idle (if it is
* indeed idle).
*/
unsigned long idle_time;
unsigned long last_update_time;
};
static void iot_init(struct io_tracker *iot)
{
spin_lock_init(&iot->lock);
iot->in_flight = 0ul;
iot->idle_time = 0ul;
iot->last_update_time = jiffies;
}
static bool __iot_idle_for(struct io_tracker *iot, unsigned long jifs)
{
if (iot->in_flight)
return false;
return time_after(jiffies, iot->idle_time + jifs);
}
static bool iot_idle_for(struct io_tracker *iot, unsigned long jifs)
{
bool r;
unsigned long flags;
spin_lock_irqsave(&iot->lock, flags);
r = __iot_idle_for(iot, jifs);
spin_unlock_irqrestore(&iot->lock, flags);
return r;
}
static void iot_io_begin(struct io_tracker *iot, sector_t len)
{
unsigned long flags;
spin_lock_irqsave(&iot->lock, flags);
iot->in_flight += len;
spin_unlock_irqrestore(&iot->lock, flags);
}
static void __iot_io_end(struct io_tracker *iot, sector_t len)
{
iot->in_flight -= len;
if (!iot->in_flight)
iot->idle_time = jiffies;
}
static void iot_io_end(struct io_tracker *iot, sector_t len)
{
unsigned long flags;
spin_lock_irqsave(&iot->lock, flags);
__iot_io_end(iot, len);
spin_unlock_irqrestore(&iot->lock, flags);
}
/*----------------------------------------------------------------*/
/*
* Glossary:
*
* oblock: index of an origin block
* cblock: index of a cache block
* promotion: movement of a block from origin to cache
* demotion: movement of a block from cache to origin
* migration: movement of a block between the origin and cache device,
* either direction
*/
/*----------------------------------------------------------------*/
/*
* There are a couple of places where we let a bio run, but want to do some
* work before calling its endio function. We do this by temporarily
* changing the endio fn.
*/
struct dm_hook_info {
bio_end_io_t *bi_end_io;
};
static void dm_hook_bio(struct dm_hook_info *h, struct bio *bio,
bio_end_io_t *bi_end_io, void *bi_private)
{
h->bi_end_io = bio->bi_end_io;
bio->bi_end_io = bi_end_io;
bio->bi_private = bi_private;
}
static void dm_unhook_bio(struct dm_hook_info *h, struct bio *bio)
{
bio->bi_end_io = h->bi_end_io;
}
/*----------------------------------------------------------------*/
#define MIGRATION_POOL_SIZE 128
#define COMMIT_PERIOD HZ
#define MIGRATION_COUNT_WINDOW 10
/*
* The block size of the device holding cache data must be
* between 32KB and 1GB.
*/
#define DATA_DEV_BLOCK_SIZE_MIN_SECTORS (32 * 1024 >> SECTOR_SHIFT)
#define DATA_DEV_BLOCK_SIZE_MAX_SECTORS (1024 * 1024 * 1024 >> SECTOR_SHIFT)
enum cache_metadata_mode {
CM_WRITE, /* metadata may be changed */
CM_READ_ONLY, /* metadata may not be changed */
CM_FAIL
};
enum cache_io_mode {
/*
* Data is written to cached blocks only. These blocks are marked
* dirty. If you lose the cache device you will lose data.
* Potential performance increase for both reads and writes.
*/
CM_IO_WRITEBACK,
/*
* Data is written to both cache and origin. Blocks are never
* dirty. Potential performance benfit for reads only.
*/
CM_IO_WRITETHROUGH,
/*
* A degraded mode useful for various cache coherency situations
* (eg, rolling back snapshots). Reads and writes always go to the
* origin. If a write goes to a cached oblock, then the cache
* block is invalidated.
*/
CM_IO_PASSTHROUGH
};
struct cache_features {
enum cache_metadata_mode mode;
enum cache_io_mode io_mode;
};
struct cache_stats {
atomic_t read_hit;
atomic_t read_miss;
atomic_t write_hit;
atomic_t write_miss;
atomic_t demotion;
atomic_t promotion;
atomic_t copies_avoided;
atomic_t cache_cell_clash;
atomic_t commit_count;
atomic_t discard_count;
};
/*
* Defines a range of cblocks, begin to (end - 1) are in the range. end is
* the one-past-the-end value.
*/
struct cblock_range {
dm_cblock_t begin;
dm_cblock_t end;
};
struct invalidation_request {
struct list_head list;
struct cblock_range *cblocks;
atomic_t complete;
int err;
wait_queue_head_t result_wait;
};
struct cache {
struct dm_target *ti;
struct dm_target_callbacks callbacks;
struct dm_cache_metadata *cmd;
/*
* Metadata is written to this device.
*/
struct dm_dev *metadata_dev;
/*
* The slower of the two data devices. Typically a spindle.
*/
struct dm_dev *origin_dev;
/*
* The faster of the two data devices. Typically an SSD.
*/
struct dm_dev *cache_dev;
/*
* Size of the origin device in _complete_ blocks and native sectors.
*/
dm_oblock_t origin_blocks;
sector_t origin_sectors;
/*
* Size of the cache device in blocks.
*/
dm_cblock_t cache_size;
/*
* Fields for converting from sectors to blocks.
*/
uint32_t sectors_per_block;
int sectors_per_block_shift;
spinlock_t lock;
struct list_head deferred_cells;
struct bio_list deferred_bios;
struct bio_list deferred_flush_bios;
struct bio_list deferred_writethrough_bios;
struct list_head quiesced_migrations;
struct list_head completed_migrations;
struct list_head need_commit_migrations;
sector_t migration_threshold;
wait_queue_head_t migration_wait;
atomic_t nr_allocated_migrations;
/*
* The number of in flight migrations that are performing
* background io. eg, promotion, writeback.
*/
atomic_t nr_io_migrations;
wait_queue_head_t quiescing_wait;
atomic_t quiescing;
atomic_t quiescing_ack;
/*
* cache_size entries, dirty if set
*/
atomic_t nr_dirty;
unsigned long *dirty_bitset;
/*
* origin_blocks entries, discarded if set.
*/
dm_dblock_t discard_nr_blocks;
unsigned long *discard_bitset;
uint32_t discard_block_size; /* a power of 2 times sectors per block */
/*
* Rather than reconstructing the table line for the status we just
* save it and regurgitate.
*/
unsigned nr_ctr_args;
const char **ctr_args;
struct dm_kcopyd_client *copier;
struct workqueue_struct *wq;
struct work_struct worker;
struct delayed_work waker;
unsigned long last_commit_jiffies;
struct dm_bio_prison *prison;
struct dm_deferred_set *all_io_ds;
mempool_t *migration_pool;
struct dm_cache_policy *policy;
unsigned policy_nr_args;
bool need_tick_bio:1;
bool sized:1;
bool invalidate:1;
bool commit_requested:1;
bool loaded_mappings:1;
bool loaded_discards:1;
/*
* Cache features such as write-through.
*/
struct cache_features features;
struct cache_stats stats;
/*
* Invalidation fields.
*/
spinlock_t invalidation_lock;
struct list_head invalidation_requests;
struct io_tracker origin_tracker;
};
struct per_bio_data {
bool tick:1;
unsigned req_nr:2;
struct dm_deferred_entry *all_io_entry;
struct dm_hook_info hook_info;
sector_t len;
/*
* writethrough fields. These MUST remain at the end of this
* structure and the 'cache' member must be the first as it
* is used to determine the offset of the writethrough fields.
*/
struct cache *cache;
dm_cblock_t cblock;
struct dm_bio_details bio_details;
};
struct dm_cache_migration {
struct list_head list;
struct cache *cache;
unsigned long start_jiffies;
dm_oblock_t old_oblock;
dm_oblock_t new_oblock;
dm_cblock_t cblock;
bool err:1;
bool discard:1;
bool writeback:1;
bool demote:1;
bool promote:1;
bool requeue_holder:1;
bool invalidate:1;
struct dm_bio_prison_cell *old_ocell;
struct dm_bio_prison_cell *new_ocell;
};
/*
* Processing a bio in the worker thread may require these memory
* allocations. We prealloc to avoid deadlocks (the same worker thread
* frees them back to the mempool).
*/
struct prealloc {
struct dm_cache_migration *mg;
struct dm_bio_prison_cell *cell1;
struct dm_bio_prison_cell *cell2;
};
static enum cache_metadata_mode get_cache_mode(struct cache *cache);
static void wake_worker(struct cache *cache)
{
queue_work(cache->wq, &cache->worker);
}
/*----------------------------------------------------------------*/
static struct dm_bio_prison_cell *alloc_prison_cell(struct cache *cache)
{
/* FIXME: change to use a local slab. */
return dm_bio_prison_alloc_cell(cache->prison, GFP_NOWAIT);
}
static void free_prison_cell(struct cache *cache, struct dm_bio_prison_cell *cell)
{
dm_bio_prison_free_cell(cache->prison, cell);
}
static struct dm_cache_migration *alloc_migration(struct cache *cache)
{
struct dm_cache_migration *mg;
mg = mempool_alloc(cache->migration_pool, GFP_NOWAIT);
if (mg) {
mg->cache = cache;
atomic_inc(&mg->cache->nr_allocated_migrations);
}
return mg;
}
static void free_migration(struct dm_cache_migration *mg)
{
struct cache *cache = mg->cache;
if (atomic_dec_and_test(&cache->nr_allocated_migrations))
wake_up(&cache->migration_wait);
mempool_free(mg, cache->migration_pool);
}
static int prealloc_data_structs(struct cache *cache, struct prealloc *p)
{
if (!p->mg) {
p->mg = alloc_migration(cache);
if (!p->mg)
return -ENOMEM;
}
if (!p->cell1) {
p->cell1 = alloc_prison_cell(cache);
if (!p->cell1)
return -ENOMEM;
}
if (!p->cell2) {
p->cell2 = alloc_prison_cell(cache);
if (!p->cell2)
return -ENOMEM;
}
return 0;
}
static void prealloc_free_structs(struct cache *cache, struct prealloc *p)
{
if (p->cell2)
free_prison_cell(cache, p->cell2);
if (p->cell1)
free_prison_cell(cache, p->cell1);
if (p->mg)
free_migration(p->mg);
}
static struct dm_cache_migration *prealloc_get_migration(struct prealloc *p)
{
struct dm_cache_migration *mg = p->mg;
BUG_ON(!mg);
p->mg = NULL;
return mg;
}
/*
* You must have a cell within the prealloc struct to return. If not this
* function will BUG() rather than returning NULL.
*/
static struct dm_bio_prison_cell *prealloc_get_cell(struct prealloc *p)
{
struct dm_bio_prison_cell *r = NULL;
if (p->cell1) {
r = p->cell1;
p->cell1 = NULL;
} else if (p->cell2) {
r = p->cell2;
p->cell2 = NULL;
} else
BUG();
return r;
}
/*
* You can't have more than two cells in a prealloc struct. BUG() will be
* called if you try and overfill.
*/
static void prealloc_put_cell(struct prealloc *p, struct dm_bio_prison_cell *cell)
{
if (!p->cell2)
p->cell2 = cell;
else if (!p->cell1)
p->cell1 = cell;
else
BUG();
}
/*----------------------------------------------------------------*/
static void build_key(dm_oblock_t begin, dm_oblock_t end, struct dm_cell_key *key)
{
key->virtual = 0;
key->dev = 0;
key->block_begin = from_oblock(begin);
key->block_end = from_oblock(end);
}
/*
* The caller hands in a preallocated cell, and a free function for it.
* The cell will be freed if there's an error, or if it wasn't used because
* a cell with that key already exists.
*/
typedef void (*cell_free_fn)(void *context, struct dm_bio_prison_cell *cell);
static int bio_detain_range(struct cache *cache, dm_oblock_t oblock_begin, dm_oblock_t oblock_end,
struct bio *bio, struct dm_bio_prison_cell *cell_prealloc,
cell_free_fn free_fn, void *free_context,
struct dm_bio_prison_cell **cell_result)
{
int r;
struct dm_cell_key key;
build_key(oblock_begin, oblock_end, &key);
r = dm_bio_detain(cache->prison, &key, bio, cell_prealloc, cell_result);
if (r)
free_fn(free_context, cell_prealloc);
return r;
}
static int bio_detain(struct cache *cache, dm_oblock_t oblock,
struct bio *bio, struct dm_bio_prison_cell *cell_prealloc,
cell_free_fn free_fn, void *free_context,
struct dm_bio_prison_cell **cell_result)
{
dm_oblock_t end = to_oblock(from_oblock(oblock) + 1ULL);
return bio_detain_range(cache, oblock, end, bio,
cell_prealloc, free_fn, free_context, cell_result);
}
static int get_cell(struct cache *cache,
dm_oblock_t oblock,
struct prealloc *structs,
struct dm_bio_prison_cell **cell_result)
{
int r;
struct dm_cell_key key;
struct dm_bio_prison_cell *cell_prealloc;
cell_prealloc = prealloc_get_cell(structs);
build_key(oblock, to_oblock(from_oblock(oblock) + 1ULL), &key);
r = dm_get_cell(cache->prison, &key, cell_prealloc, cell_result);
if (r)
prealloc_put_cell(structs, cell_prealloc);
return r;
}
/*----------------------------------------------------------------*/
static bool is_dirty(struct cache *cache, dm_cblock_t b)
{
return test_bit(from_cblock(b), cache->dirty_bitset);
}
static void set_dirty(struct cache *cache, dm_oblock_t oblock, dm_cblock_t cblock)
{
if (!test_and_set_bit(from_cblock(cblock), cache->dirty_bitset)) {
atomic_inc(&cache->nr_dirty);
policy_set_dirty(cache->policy, oblock);
}
}
static void clear_dirty(struct cache *cache, dm_oblock_t oblock, dm_cblock_t cblock)
{
if (test_and_clear_bit(from_cblock(cblock), cache->dirty_bitset)) {
policy_clear_dirty(cache->policy, oblock);
if (atomic_dec_return(&cache->nr_dirty) == 0)
dm_table_event(cache->ti->table);
}
}
/*----------------------------------------------------------------*/
static bool block_size_is_power_of_two(struct cache *cache)
{
return cache->sectors_per_block_shift >= 0;
}
/* gcc on ARM generates spurious references to __udivdi3 and __umoddi3 */
#if defined(CONFIG_ARM) && __GNUC__ == 4 && __GNUC_MINOR__ <= 6
__always_inline
#endif
static dm_block_t block_div(dm_block_t b, uint32_t n)
{
do_div(b, n);
return b;
}
static dm_block_t oblocks_per_dblock(struct cache *cache)
{
dm_block_t oblocks = cache->discard_block_size;
if (block_size_is_power_of_two(cache))
oblocks >>= cache->sectors_per_block_shift;
else
oblocks = block_div(oblocks, cache->sectors_per_block);
return oblocks;
}
static dm_dblock_t oblock_to_dblock(struct cache *cache, dm_oblock_t oblock)
{
return to_dblock(block_div(from_oblock(oblock),
oblocks_per_dblock(cache)));
}
static dm_oblock_t dblock_to_oblock(struct cache *cache, dm_dblock_t dblock)
{
return to_oblock(from_dblock(dblock) * oblocks_per_dblock(cache));
}
static void set_discard(struct cache *cache, dm_dblock_t b)
{
unsigned long flags;
BUG_ON(from_dblock(b) >= from_dblock(cache->discard_nr_blocks));
atomic_inc(&cache->stats.discard_count);
spin_lock_irqsave(&cache->lock, flags);
set_bit(from_dblock(b), cache->discard_bitset);
spin_unlock_irqrestore(&cache->lock, flags);
}
static void clear_discard(struct cache *cache, dm_dblock_t b)
{
unsigned long flags;
spin_lock_irqsave(&cache->lock, flags);
clear_bit(from_dblock(b), cache->discard_bitset);
spin_unlock_irqrestore(&cache->lock, flags);
}
static bool is_discarded(struct cache *cache, dm_dblock_t b)
{
int r;
unsigned long flags;
spin_lock_irqsave(&cache->lock, flags);
r = test_bit(from_dblock(b), cache->discard_bitset);
spin_unlock_irqrestore(&cache->lock, flags);
return r;
}
static bool is_discarded_oblock(struct cache *cache, dm_oblock_t b)
{
int r;
unsigned long flags;
spin_lock_irqsave(&cache->lock, flags);
r = test_bit(from_dblock(oblock_to_dblock(cache, b)),
cache->discard_bitset);
spin_unlock_irqrestore(&cache->lock, flags);
return r;
}
/*----------------------------------------------------------------*/
static void load_stats(struct cache *cache)
{
struct dm_cache_statistics stats;
dm_cache_metadata_get_stats(cache->cmd, &stats);
atomic_set(&cache->stats.read_hit, stats.read_hits);
atomic_set(&cache->stats.read_miss, stats.read_misses);
atomic_set(&cache->stats.write_hit, stats.write_hits);
atomic_set(&cache->stats.write_miss, stats.write_misses);
}
static void save_stats(struct cache *cache)
{
struct dm_cache_statistics stats;
if (get_cache_mode(cache) >= CM_READ_ONLY)
return;
stats.read_hits = atomic_read(&cache->stats.read_hit);
stats.read_misses = atomic_read(&cache->stats.read_miss);
stats.write_hits = atomic_read(&cache->stats.write_hit);
stats.write_misses = atomic_read(&cache->stats.write_miss);
dm_cache_metadata_set_stats(cache->cmd, &stats);
}
/*----------------------------------------------------------------
* Per bio data
*--------------------------------------------------------------*/
/*
* If using writeback, leave out struct per_bio_data's writethrough fields.
*/
#define PB_DATA_SIZE_WB (offsetof(struct per_bio_data, cache))
#define PB_DATA_SIZE_WT (sizeof(struct per_bio_data))
static bool writethrough_mode(struct cache_features *f)
{
return f->io_mode == CM_IO_WRITETHROUGH;
}
static bool writeback_mode(struct cache_features *f)
{
return f->io_mode == CM_IO_WRITEBACK;
}
static bool passthrough_mode(struct cache_features *f)
{
return f->io_mode == CM_IO_PASSTHROUGH;
}
static size_t get_per_bio_data_size(struct cache *cache)
{
return writethrough_mode(&cache->features) ? PB_DATA_SIZE_WT : PB_DATA_SIZE_WB;
}
static struct per_bio_data *get_per_bio_data(struct bio *bio, size_t data_size)
{
struct per_bio_data *pb = dm_per_bio_data(bio, data_size);
BUG_ON(!pb);
return pb;
}
static struct per_bio_data *init_per_bio_data(struct bio *bio, size_t data_size)
{
struct per_bio_data *pb = get_per_bio_data(bio, data_size);
pb->tick = false;
pb->req_nr = dm_bio_get_target_bio_nr(bio);
pb->all_io_entry = NULL;
pb->len = 0;
return pb;
}
/*----------------------------------------------------------------
* Remapping
*--------------------------------------------------------------*/
static void remap_to_origin(struct cache *cache, struct bio *bio)
{
bio->bi_bdev = cache->origin_dev->bdev;
}
static void remap_to_cache(struct cache *cache, struct bio *bio,
dm_cblock_t cblock)
{
sector_t bi_sector = bio->bi_iter.bi_sector;
sector_t block = from_cblock(cblock);
bio->bi_bdev = cache->cache_dev->bdev;
if (!block_size_is_power_of_two(cache))
bio->bi_iter.bi_sector =
(block * cache->sectors_per_block) +
sector_div(bi_sector, cache->sectors_per_block);
else
bio->bi_iter.bi_sector =
(block << cache->sectors_per_block_shift) |
(bi_sector & (cache->sectors_per_block - 1));
}
static void check_if_tick_bio_needed(struct cache *cache, struct bio *bio)
{
unsigned long flags;
size_t pb_data_size = get_per_bio_data_size(cache);
struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);
spin_lock_irqsave(&cache->lock, flags);
if (cache->need_tick_bio &&
!(bio->bi_rw & (REQ_FUA | REQ_FLUSH | REQ_DISCARD))) {
pb->tick = true;
cache->need_tick_bio = false;
}
spin_unlock_irqrestore(&cache->lock, flags);
}
static void remap_to_origin_clear_discard(struct cache *cache, struct bio *bio,
dm_oblock_t oblock)
{
check_if_tick_bio_needed(cache, bio);
remap_to_origin(cache, bio);
if (bio_data_dir(bio) == WRITE)
clear_discard(cache, oblock_to_dblock(cache, oblock));
}
static void remap_to_cache_dirty(struct cache *cache, struct bio *bio,
dm_oblock_t oblock, dm_cblock_t cblock)
{
check_if_tick_bio_needed(cache, bio);
remap_to_cache(cache, bio, cblock);
if (bio_data_dir(bio) == WRITE) {
set_dirty(cache, oblock, cblock);
clear_discard(cache, oblock_to_dblock(cache, oblock));
}
}
static dm_oblock_t get_bio_block(struct cache *cache, struct bio *bio)
{
sector_t block_nr = bio->bi_iter.bi_sector;
if (!block_size_is_power_of_two(cache))
(void) sector_div(block_nr, cache->sectors_per_block);
else
block_nr >>= cache->sectors_per_block_shift;
return to_oblock(block_nr);
}
static int bio_triggers_commit(struct cache *cache, struct bio *bio)
{
return bio->bi_rw & (REQ_FLUSH | REQ_FUA);
}
/*
* You must increment the deferred set whilst the prison cell is held. To
* encourage this, we ask for 'cell' to be passed in.
*/
static void inc_ds(struct cache *cache, struct bio *bio,
struct dm_bio_prison_cell *cell)
{
size_t pb_data_size = get_per_bio_data_size(cache);
struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);
BUG_ON(!cell);
BUG_ON(pb->all_io_entry);
pb->all_io_entry = dm_deferred_entry_inc(cache->all_io_ds);
}
static bool accountable_bio(struct cache *cache, struct bio *bio)
{
return ((bio->bi_bdev == cache->origin_dev->bdev) &&
!(bio->bi_rw & REQ_DISCARD));
}
static void accounted_begin(struct cache *cache, struct bio *bio)
{
size_t pb_data_size = get_per_bio_data_size(cache);
struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);
if (accountable_bio(cache, bio)) {
pb->len = bio_sectors(bio);
iot_io_begin(&cache->origin_tracker, pb->len);
}
}
static void accounted_complete(struct cache *cache, struct bio *bio)
{
size_t pb_data_size = get_per_bio_data_size(cache);
struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);
iot_io_end(&cache->origin_tracker, pb->len);
}
static void accounted_request(struct cache *cache, struct bio *bio)
{
accounted_begin(cache, bio);
generic_make_request(bio);
}
static void issue(struct cache *cache, struct bio *bio)
{
unsigned long flags;
if (!bio_triggers_commit(cache, bio)) {
accounted_request(cache, bio);
return;
}
/*
* Batch together any bios that trigger commits and then issue a
* single commit for them in do_worker().
*/
spin_lock_irqsave(&cache->lock, flags);
cache->commit_requested = true;
bio_list_add(&cache->deferred_flush_bios, bio);
spin_unlock_irqrestore(&cache->lock, flags);
}
static void inc_and_issue(struct cache *cache, struct bio *bio, struct dm_bio_prison_cell *cell)
{
inc_ds(cache, bio, cell);
issue(cache, bio);
}
static void defer_writethrough_bio(struct cache *cache, struct bio *bio)
{
unsigned long flags;
spin_lock_irqsave(&cache->lock, flags);
bio_list_add(&cache->deferred_writethrough_bios, bio);
spin_unlock_irqrestore(&cache->lock, flags);
wake_worker(cache);
}
static void writethrough_endio(struct bio *bio)
{
struct per_bio_data *pb = get_per_bio_data(bio, PB_DATA_SIZE_WT);
dm_unhook_bio(&pb->hook_info, bio);
if (bio->bi_error) {
bio_endio(bio);
return;
}
dm_bio_restore(&pb->bio_details, bio);
remap_to_cache(pb->cache, bio, pb->cblock);
/*
* We can't issue this bio directly, since we're in interrupt
* context. So it gets put on a bio list for processing by the
* worker thread.
*/
defer_writethrough_bio(pb->cache, bio);
}
/*
* When running in writethrough mode we need to send writes to clean blocks
* to both the cache and origin devices. In future we'd like to clone the
* bio and send them in parallel, but for now we're doing them in
* series as this is easier.
*/
static void remap_to_origin_then_cache(struct cache *cache, struct bio *bio,
dm_oblock_t oblock, dm_cblock_t cblock)
{
struct per_bio_data *pb = get_per_bio_data(bio, PB_DATA_SIZE_WT);
pb->cache = cache;
pb->cblock = cblock;
dm_hook_bio(&pb->hook_info, bio, writethrough_endio, NULL);
dm_bio_record(&pb->bio_details, bio);
remap_to_origin_clear_discard(pb->cache, bio, oblock);
}
/*----------------------------------------------------------------
* Failure modes
*--------------------------------------------------------------*/
static enum cache_metadata_mode get_cache_mode(struct cache *cache)
{
return cache->features.mode;
}
static const char *cache_device_name(struct cache *cache)
{
return dm_device_name(dm_table_get_md(cache->ti->table));
}
static void notify_mode_switch(struct cache *cache, enum cache_metadata_mode mode)
{
const char *descs[] = {
"write",
"read-only",
"fail"
};
dm_table_event(cache->ti->table);
DMINFO("%s: switching cache to %s mode",
cache_device_name(cache), descs[(int)mode]);
}
static void set_cache_mode(struct cache *cache, enum cache_metadata_mode new_mode)
{
bool needs_check;
enum cache_metadata_mode old_mode = get_cache_mode(cache);
if (dm_cache_metadata_needs_check(cache->cmd, &needs_check)) {
DMERR("unable to read needs_check flag, setting failure mode");
new_mode = CM_FAIL;
}
if (new_mode == CM_WRITE && needs_check) {
DMERR("%s: unable to switch cache to write mode until repaired.",
cache_device_name(cache));
if (old_mode != new_mode)
new_mode = old_mode;
else
new_mode = CM_READ_ONLY;
}
/* Never move out of fail mode */
if (old_mode == CM_FAIL)
new_mode = CM_FAIL;
switch (new_mode) {
case CM_FAIL:
case CM_READ_ONLY:
dm_cache_metadata_set_read_only(cache->cmd);
break;
case CM_WRITE:
dm_cache_metadata_set_read_write(cache->cmd);
break;
}
cache->features.mode = new_mode;
if (new_mode != old_mode)
notify_mode_switch(cache, new_mode);
}
static void abort_transaction(struct cache *cache)
{
const char *dev_name = cache_device_name(cache);
if (get_cache_mode(cache) >= CM_READ_ONLY)
return;
if (dm_cache_metadata_set_needs_check(cache->cmd)) {
DMERR("%s: failed to set 'needs_check' flag in metadata", dev_name);
set_cache_mode(cache, CM_FAIL);
}
DMERR_LIMIT("%s: aborting current metadata transaction", dev_name);
if (dm_cache_metadata_abort(cache->cmd)) {
DMERR("%s: failed to abort metadata transaction", dev_name);
set_cache_mode(cache, CM_FAIL);
}
}
static void metadata_operation_failed(struct cache *cache, const char *op, int r)
{
DMERR_LIMIT("%s: metadata operation '%s' failed: error = %d",
cache_device_name(cache), op, r);
abort_transaction(cache);
set_cache_mode(cache, CM_READ_ONLY);
}
/*----------------------------------------------------------------
* Migration processing
*
* Migration covers moving data from the origin device to the cache, or
* vice versa.
*--------------------------------------------------------------*/
static void inc_io_migrations(struct cache *cache)
{
atomic_inc(&cache->nr_io_migrations);
}
static void dec_io_migrations(struct cache *cache)
{
atomic_dec(&cache->nr_io_migrations);
}
static bool discard_or_flush(struct bio *bio)
{
return bio->bi_rw & (REQ_FLUSH | REQ_FUA | REQ_DISCARD);
}
static void __cell_defer(struct cache *cache, struct dm_bio_prison_cell *cell)
{
if (discard_or_flush(cell->holder)) {
/*
* We have to handle these bios individually.
*/
dm_cell_release(cache->prison, cell, &cache->deferred_bios);
free_prison_cell(cache, cell);
} else
list_add_tail(&cell->user_list, &cache->deferred_cells);
}
static void cell_defer(struct cache *cache, struct dm_bio_prison_cell *cell, bool holder)
{
unsigned long flags;
if (!holder && dm_cell_promote_or_release(cache->prison, cell)) {
/*
* There was no prisoner to promote to holder, the
* cell has been released.
*/
free_prison_cell(cache, cell);
return;
}
spin_lock_irqsave(&cache->lock, flags);
__cell_defer(cache, cell);
spin_unlock_irqrestore(&cache->lock, flags);
wake_worker(cache);
}
static void cell_error_with_code(struct cache *cache, struct dm_bio_prison_cell *cell, int err)
{
dm_cell_error(cache->prison, cell, err);
free_prison_cell(cache, cell);
}
static void cell_requeue(struct cache *cache, struct dm_bio_prison_cell *cell)
{
cell_error_with_code(cache, cell, DM_ENDIO_REQUEUE);
}
static void free_io_migration(struct dm_cache_migration *mg)
{
struct cache *cache = mg->cache;
dec_io_migrations(cache);
free_migration(mg);
wake_worker(cache);
}
static void migration_failure(struct dm_cache_migration *mg)
{
struct cache *cache = mg->cache;
const char *dev_name = cache_device_name(cache);
if (mg->writeback) {
DMERR_LIMIT("%s: writeback failed; couldn't copy block", dev_name);
set_dirty(cache, mg->old_oblock, mg->cblock);
cell_defer(cache, mg->old_ocell, false);
} else if (mg->demote) {
DMERR_LIMIT("%s: demotion failed; couldn't copy block", dev_name);
policy_force_mapping(cache->policy, mg->new_oblock, mg->old_oblock);
cell_defer(cache, mg->old_ocell, mg->promote ? false : true);
if (mg->promote)
cell_defer(cache, mg->new_ocell, true);
} else {
DMERR_LIMIT("%s: promotion failed; couldn't copy block", dev_name);
policy_remove_mapping(cache->policy, mg->new_oblock);
cell_defer(cache, mg->new_ocell, true);
}
free_io_migration(mg);
}
static void migration_success_pre_commit(struct dm_cache_migration *mg)
{
int r;
unsigned long flags;
struct cache *cache = mg->cache;
if (mg->writeback) {
clear_dirty(cache, mg->old_oblock, mg->cblock);
cell_defer(cache, mg->old_ocell, false);
free_io_migration(mg);
return;
} else if (mg->demote) {
r = dm_cache_remove_mapping(cache->cmd, mg->cblock);
if (r) {
DMERR_LIMIT("%s: demotion failed; couldn't update on disk metadata",
cache_device_name(cache));
metadata_operation_failed(cache, "dm_cache_remove_mapping", r);
policy_force_mapping(cache->policy, mg->new_oblock,
mg->old_oblock);
if (mg->promote)
cell_defer(cache, mg->new_ocell, true);
free_io_migration(mg);
return;
}
} else {
r = dm_cache_insert_mapping(cache->cmd, mg->cblock, mg->new_oblock);
if (r) {
DMERR_LIMIT("%s: promotion failed; couldn't update on disk metadata",
cache_device_name(cache));
metadata_operation_failed(cache, "dm_cache_insert_mapping", r);
policy_remove_mapping(cache->policy, mg->new_oblock);
free_io_migration(mg);
return;
}
}
spin_lock_irqsave(&cache->lock, flags);
list_add_tail(&mg->list, &cache->need_commit_migrations);
cache->commit_requested = true;
spin_unlock_irqrestore(&cache->lock, flags);
}
static void migration_success_post_commit(struct dm_cache_migration *mg)
{
unsigned long flags;
struct cache *cache = mg->cache;
if (mg->writeback) {
DMWARN_LIMIT("%s: writeback unexpectedly triggered commit",
cache_device_name(cache));
return;
} else if (mg->demote) {
cell_defer(cache, mg->old_ocell, mg->promote ? false : true);
if (mg->promote) {
mg->demote = false;
spin_lock_irqsave(&cache->lock, flags);
list_add_tail(&mg->list, &cache->quiesced_migrations);
spin_unlock_irqrestore(&cache->lock, flags);
} else {
if (mg->invalidate)
policy_remove_mapping(cache->policy, mg->old_oblock);
free_io_migration(mg);
}
} else {
if (mg->requeue_holder) {
clear_dirty(cache, mg->new_oblock, mg->cblock);
cell_defer(cache, mg->new_ocell, true);
} else {
/*
* The block was promoted via an overwrite, so it's dirty.
*/
set_dirty(cache, mg->new_oblock, mg->cblock);
bio_endio(mg->new_ocell->holder);
cell_defer(cache, mg->new_ocell, false);
}
free_io_migration(mg);
}
}
static void copy_complete(int read_err, unsigned long write_err, void *context)
{
unsigned long flags;
struct dm_cache_migration *mg = (struct dm_cache_migration *) context;
struct cache *cache = mg->cache;
if (read_err || write_err)
mg->err = true;
spin_lock_irqsave(&cache->lock, flags);
list_add_tail(&mg->list, &cache->completed_migrations);
spin_unlock_irqrestore(&cache->lock, flags);
wake_worker(cache);
}
static void issue_copy(struct dm_cache_migration *mg)
{
int r;
struct dm_io_region o_region, c_region;
struct cache *cache = mg->cache;
sector_t cblock = from_cblock(mg->cblock);
o_region.bdev = cache->origin_dev->bdev;
o_region.count = cache->sectors_per_block;
c_region.bdev = cache->cache_dev->bdev;
c_region.sector = cblock * cache->sectors_per_block;
c_region.count = cache->sectors_per_block;
if (mg->writeback || mg->demote) {
/* demote */
o_region.sector = from_oblock(mg->old_oblock) * cache->sectors_per_block;
r = dm_kcopyd_copy(cache->copier, &c_region, 1, &o_region, 0, copy_complete, mg);
} else {
/* promote */
o_region.sector = from_oblock(mg->new_oblock) * cache->sectors_per_block;
r = dm_kcopyd_copy(cache->copier, &o_region, 1, &c_region, 0, copy_complete, mg);
}
if (r < 0) {
DMERR_LIMIT("%s: issuing migration failed", cache_device_name(cache));
migration_failure(mg);
}
}
static void overwrite_endio(struct bio *bio)
{
struct dm_cache_migration *mg = bio->bi_private;
struct cache *cache = mg->cache;
size_t pb_data_size = get_per_bio_data_size(cache);
struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);
unsigned long flags;
dm_unhook_bio(&pb->hook_info, bio);
if (bio->bi_error)
mg->err = true;
mg->requeue_holder = false;
spin_lock_irqsave(&cache->lock, flags);
list_add_tail(&mg->list, &cache->completed_migrations);
spin_unlock_irqrestore(&cache->lock, flags);
wake_worker(cache);
}
static void issue_overwrite(struct dm_cache_migration *mg, struct bio *bio)
{
size_t pb_data_size = get_per_bio_data_size(mg->cache);
struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);
dm_hook_bio(&pb->hook_info, bio, overwrite_endio, mg);
remap_to_cache_dirty(mg->cache, bio, mg->new_oblock, mg->cblock);
/*
* No need to inc_ds() here, since the cell will be held for the
* duration of the io.
*/
accounted_request(mg->cache, bio);
}
static bool bio_writes_complete_block(struct cache *cache, struct bio *bio)
{
return (bio_data_dir(bio) == WRITE) &&
(bio->bi_iter.bi_size == (cache->sectors_per_block << SECTOR_SHIFT));
}
static void avoid_copy(struct dm_cache_migration *mg)
{
atomic_inc(&mg->cache->stats.copies_avoided);
migration_success_pre_commit(mg);
}
static void calc_discard_block_range(struct cache *cache, struct bio *bio,
dm_dblock_t *b, dm_dblock_t *e)
{
sector_t sb = bio->bi_iter.bi_sector;
sector_t se = bio_end_sector(bio);
*b = to_dblock(dm_sector_div_up(sb, cache->discard_block_size));
if (se - sb < cache->discard_block_size)
*e = *b;
else
*e = to_dblock(block_div(se, cache->discard_block_size));
}
static void issue_discard(struct dm_cache_migration *mg)
{
dm_dblock_t b, e;
struct bio *bio = mg->new_ocell->holder;
struct cache *cache = mg->cache;
calc_discard_block_range(cache, bio, &b, &e);
while (b != e) {
set_discard(cache, b);
b = to_dblock(from_dblock(b) + 1);
}
bio_endio(bio);
cell_defer(cache, mg->new_ocell, false);
free_migration(mg);
wake_worker(cache);
}
static void issue_copy_or_discard(struct dm_cache_migration *mg)
{
bool avoid;
struct cache *cache = mg->cache;
if (mg->discard) {
issue_discard(mg);
return;
}
if (mg->writeback || mg->demote)
avoid = !is_dirty(cache, mg->cblock) ||
is_discarded_oblock(cache, mg->old_oblock);
else {
struct bio *bio = mg->new_ocell->holder;
avoid = is_discarded_oblock(cache, mg->new_oblock);
if (writeback_mode(&cache->features) &&
!avoid && bio_writes_complete_block(cache, bio)) {
issue_overwrite(mg, bio);
return;
}
}
avoid ? avoid_copy(mg) : issue_copy(mg);
}
static void complete_migration(struct dm_cache_migration *mg)
{
if (mg->err)
migration_failure(mg);
else
migration_success_pre_commit(mg);
}
static void process_migrations(struct cache *cache, struct list_head *head,
void (*fn)(struct dm_cache_migration *))
{
unsigned long flags;
struct list_head list;
struct dm_cache_migration *mg, *tmp;
INIT_LIST_HEAD(&list);
spin_lock_irqsave(&cache->lock, flags);
list_splice_init(head, &list);
spin_unlock_irqrestore(&cache->lock, flags);
list_for_each_entry_safe(mg, tmp, &list, list)
fn(mg);
}
static void __queue_quiesced_migration(struct dm_cache_migration *mg)
{
list_add_tail(&mg->list, &mg->cache->quiesced_migrations);
}
static void queue_quiesced_migration(struct dm_cache_migration *mg)
{
unsigned long flags;
struct cache *cache = mg->cache;
spin_lock_irqsave(&cache->lock, flags);
__queue_quiesced_migration(mg);
spin_unlock_irqrestore(&cache->lock, flags);
wake_worker(cache);
}
static void queue_quiesced_migrations(struct cache *cache, struct list_head *work)
{
unsigned long flags;
struct dm_cache_migration *mg, *tmp;
spin_lock_irqsave(&cache->lock, flags);
list_for_each_entry_safe(mg, tmp, work, list)
__queue_quiesced_migration(mg);
spin_unlock_irqrestore(&cache->lock, flags);
wake_worker(cache);
}
static void check_for_quiesced_migrations(struct cache *cache,
struct per_bio_data *pb)
{
struct list_head work;
if (!pb->all_io_entry)
return;
INIT_LIST_HEAD(&work);
dm_deferred_entry_dec(pb->all_io_entry, &work);
if (!list_empty(&work))
queue_quiesced_migrations(cache, &work);
}
static void quiesce_migration(struct dm_cache_migration *mg)
{
if (!dm_deferred_set_add_work(mg->cache->all_io_ds, &mg->list))
queue_quiesced_migration(mg);
}
static void promote(struct cache *cache, struct prealloc *structs,
dm_oblock_t oblock, dm_cblock_t cblock,
struct dm_bio_prison_cell *cell)
{
struct dm_cache_migration *mg = prealloc_get_migration(structs);
mg->err = false;
mg->discard = false;
mg->writeback = false;
mg->demote = false;
mg->promote = true;
mg->requeue_holder = true;
mg->invalidate = false;
mg->cache = cache;
mg->new_oblock = oblock;
mg->cblock = cblock;
mg->old_ocell = NULL;
mg->new_ocell = cell;
mg->start_jiffies = jiffies;
inc_io_migrations(cache);
quiesce_migration(mg);
}
static void writeback(struct cache *cache, struct prealloc *structs,
dm_oblock_t oblock, dm_cblock_t cblock,
struct dm_bio_prison_cell *cell)
{
struct dm_cache_migration *mg = prealloc_get_migration(structs);
mg->err = false;
mg->discard = false;
mg->writeback = true;
mg->demote = false;
mg->promote = false;
mg->requeue_holder = true;
mg->invalidate = false;
mg->cache = cache;
mg->old_oblock = oblock;
mg->cblock = cblock;
mg->old_ocell = cell;
mg->new_ocell = NULL;
mg->start_jiffies = jiffies;
inc_io_migrations(cache);
quiesce_migration(mg);
}
static void demote_then_promote(struct cache *cache, struct prealloc *structs,
dm_oblock_t old_oblock, dm_oblock_t new_oblock,
dm_cblock_t cblock,
struct dm_bio_prison_cell *old_ocell,
struct dm_bio_prison_cell *new_ocell)
{
struct dm_cache_migration *mg = prealloc_get_migration(structs);
mg->err = false;
mg->discard = false;
mg->writeback = false;
mg->demote = true;
mg->promote = true;
mg->requeue_holder = true;
mg->invalidate = false;
mg->cache = cache;
mg->old_oblock = old_oblock;
mg->new_oblock = new_oblock;
mg->cblock = cblock;
mg->old_ocell = old_ocell;
mg->new_ocell = new_ocell;
mg->start_jiffies = jiffies;
inc_io_migrations(cache);
quiesce_migration(mg);
}
/*
* Invalidate a cache entry. No writeback occurs; any changes in the cache
* block are thrown away.
*/
static void invalidate(struct cache *cache, struct prealloc *structs,
dm_oblock_t oblock, dm_cblock_t cblock,
struct dm_bio_prison_cell *cell)
{
struct dm_cache_migration *mg = prealloc_get_migration(structs);
mg->err = false;
mg->discard = false;
mg->writeback = false;
mg->demote = true;
mg->promote = false;
mg->requeue_holder = true;
mg->invalidate = true;
mg->cache = cache;
mg->old_oblock = oblock;
mg->cblock = cblock;
mg->old_ocell = cell;
mg->new_ocell = NULL;
mg->start_jiffies = jiffies;
inc_io_migrations(cache);
quiesce_migration(mg);
}
static void discard(struct cache *cache, struct prealloc *structs,
struct dm_bio_prison_cell *cell)
{
struct dm_cache_migration *mg = prealloc_get_migration(structs);
mg->err = false;
mg->discard = true;
mg->writeback = false;
mg->demote = false;
mg->promote = false;
mg->requeue_holder = false;
mg->invalidate = false;
mg->cache = cache;
mg->old_ocell = NULL;
mg->new_ocell = cell;
mg->start_jiffies = jiffies;
quiesce_migration(mg);
}
/*----------------------------------------------------------------
* bio processing
*--------------------------------------------------------------*/
static void defer_bio(struct cache *cache, struct bio *bio)
{
unsigned long flags;
spin_lock_irqsave(&cache->lock, flags);
bio_list_add(&cache->deferred_bios, bio);
spin_unlock_irqrestore(&cache->lock, flags);
wake_worker(cache);
}
static void process_flush_bio(struct cache *cache, struct bio *bio)
{
size_t pb_data_size = get_per_bio_data_size(cache);
struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);
BUG_ON(bio->bi_iter.bi_size);
if (!pb->req_nr)
remap_to_origin(cache, bio);
else
remap_to_cache(cache, bio, 0);
/*
* REQ_FLUSH is not directed at any particular block so we don't
* need to inc_ds(). REQ_FUA's are split into a write + REQ_FLUSH
* by dm-core.
*/
issue(cache, bio);
}
static void process_discard_bio(struct cache *cache, struct prealloc *structs,
struct bio *bio)
{
int r;
dm_dblock_t b, e;
struct dm_bio_prison_cell *cell_prealloc, *new_ocell;
calc_discard_block_range(cache, bio, &b, &e);
if (b == e) {
bio_endio(bio);
return;
}
cell_prealloc = prealloc_get_cell(structs);
r = bio_detain_range(cache, dblock_to_oblock(cache, b), dblock_to_oblock(cache, e), bio, cell_prealloc,
(cell_free_fn) prealloc_put_cell,
structs, &new_ocell);
if (r > 0)
return;
discard(cache, structs, new_ocell);
}
static bool spare_migration_bandwidth(struct cache *cache)
{
sector_t current_volume = (atomic_read(&cache->nr_io_migrations) + 1) *
cache->sectors_per_block;
return current_volume < cache->migration_threshold;
}
static void inc_hit_counter(struct cache *cache, struct bio *bio)
{
atomic_inc(bio_data_dir(bio) == READ ?
&cache->stats.read_hit : &cache->stats.write_hit);
}
static void inc_miss_counter(struct cache *cache, struct bio *bio)
{
atomic_inc(bio_data_dir(bio) == READ ?
&cache->stats.read_miss : &cache->stats.write_miss);
}
/*----------------------------------------------------------------*/
struct inc_detail {
struct cache *cache;
struct bio_list bios_for_issue;
struct bio_list unhandled_bios;
bool any_writes;
};
static void inc_fn(void *context, struct dm_bio_prison_cell *cell)
{
struct bio *bio;
struct inc_detail *detail = context;
struct cache *cache = detail->cache;
inc_ds(cache, cell->holder, cell);
if (bio_data_dir(cell->holder) == WRITE)
detail->any_writes = true;
while ((bio = bio_list_pop(&cell->bios))) {
if (discard_or_flush(bio)) {
bio_list_add(&detail->unhandled_bios, bio);
continue;
}
if (bio_data_dir(bio) == WRITE)
detail->any_writes = true;
bio_list_add(&detail->bios_for_issue, bio);
inc_ds(cache, bio, cell);
}
}
// FIXME: refactor these two
static void remap_cell_to_origin_clear_discard(struct cache *cache,
struct dm_bio_prison_cell *cell,
dm_oblock_t oblock, bool issue_holder)
{
struct bio *bio;
unsigned long flags;
struct inc_detail detail;
detail.cache = cache;
bio_list_init(&detail.bios_for_issue);
bio_list_init(&detail.unhandled_bios);
detail.any_writes = false;
spin_lock_irqsave(&cache->lock, flags);
dm_cell_visit_release(cache->prison, inc_fn, &detail, cell);
bio_list_merge(&cache->deferred_bios, &detail.unhandled_bios);
spin_unlock_irqrestore(&cache->lock, flags);
remap_to_origin(cache, cell->holder);
if (issue_holder)
issue(cache, cell->holder);
else
accounted_begin(cache, cell->holder);
if (detail.any_writes)
clear_discard(cache, oblock_to_dblock(cache, oblock));
while ((bio = bio_list_pop(&detail.bios_for_issue))) {
remap_to_origin(cache, bio);
issue(cache, bio);
}
free_prison_cell(cache, cell);
}
static void remap_cell_to_cache_dirty(struct cache *cache, struct dm_bio_prison_cell *cell,
dm_oblock_t oblock, dm_cblock_t cblock, bool issue_holder)
{
struct bio *bio;
unsigned long flags;
struct inc_detail detail;
detail.cache = cache;
bio_list_init(&detail.bios_for_issue);
bio_list_init(&detail.unhandled_bios);
detail.any_writes = false;
spin_lock_irqsave(&cache->lock, flags);
dm_cell_visit_release(cache->prison, inc_fn, &detail, cell);
bio_list_merge(&cache->deferred_bios, &detail.unhandled_bios);
spin_unlock_irqrestore(&cache->lock, flags);
remap_to_cache(cache, cell->holder, cblock);
if (issue_holder)
issue(cache, cell->holder);
else
accounted_begin(cache, cell->holder);
if (detail.any_writes) {
set_dirty(cache, oblock, cblock);
clear_discard(cache, oblock_to_dblock(cache, oblock));
}
while ((bio = bio_list_pop(&detail.bios_for_issue))) {
remap_to_cache(cache, bio, cblock);
issue(cache, bio);
}
free_prison_cell(cache, cell);
}
/*----------------------------------------------------------------*/
struct old_oblock_lock {
struct policy_locker locker;
struct cache *cache;
struct prealloc *structs;
struct dm_bio_prison_cell *cell;
};
static int null_locker(struct policy_locker *locker, dm_oblock_t b)
{
/* This should never be called */
BUG();
return 0;
}
static int cell_locker(struct policy_locker *locker, dm_oblock_t b)
{
struct old_oblock_lock *l = container_of(locker, struct old_oblock_lock, locker);
struct dm_bio_prison_cell *cell_prealloc = prealloc_get_cell(l->structs);
return bio_detain(l->cache, b, NULL, cell_prealloc,
(cell_free_fn) prealloc_put_cell,
l->structs, &l->cell);
}
static void process_cell(struct cache *cache, struct prealloc *structs,
struct dm_bio_prison_cell *new_ocell)
{
int r;
bool release_cell = true;
struct bio *bio = new_ocell->holder;
dm_oblock_t block = get_bio_block(cache, bio);
struct policy_result lookup_result;
bool passthrough = passthrough_mode(&cache->features);
bool fast_promotion, can_migrate;
struct old_oblock_lock ool;
fast_promotion = is_discarded_oblock(cache, block) || bio_writes_complete_block(cache, bio);
can_migrate = !passthrough && (fast_promotion || spare_migration_bandwidth(cache));
ool.locker.fn = cell_locker;
ool.cache = cache;
ool.structs = structs;
ool.cell = NULL;
r = policy_map(cache->policy, block, true, can_migrate, fast_promotion,
bio, &ool.locker, &lookup_result);
if (r == -EWOULDBLOCK)
/* migration has been denied */
lookup_result.op = POLICY_MISS;
switch (lookup_result.op) {
case POLICY_HIT:
if (passthrough) {
inc_miss_counter(cache, bio);
/*
* Passthrough always maps to the origin,
* invalidating any cache blocks that are written
* to.
*/
if (bio_data_dir(bio) == WRITE) {
atomic_inc(&cache->stats.demotion);
invalidate(cache, structs, block, lookup_result.cblock, new_ocell);
release_cell = false;
} else {
/* FIXME: factor out issue_origin() */
remap_to_origin_clear_discard(cache, bio, block);
inc_and_issue(cache, bio, new_ocell);
}
} else {
inc_hit_counter(cache, bio);
if (bio_data_dir(bio) == WRITE &&
writethrough_mode(&cache->features) &&
!is_dirty(cache, lookup_result.cblock)) {
remap_to_origin_then_cache(cache, bio, block, lookup_result.cblock);
inc_and_issue(cache, bio, new_ocell);
} else {
remap_cell_to_cache_dirty(cache, new_ocell, block, lookup_result.cblock, true);
release_cell = false;
}
}
break;
case POLICY_MISS:
inc_miss_counter(cache, bio);
remap_cell_to_origin_clear_discard(cache, new_ocell, block, true);
release_cell = false;
break;
case POLICY_NEW:
atomic_inc(&cache->stats.promotion);
promote(cache, structs, block, lookup_result.cblock, new_ocell);
release_cell = false;
break;
case POLICY_REPLACE:
atomic_inc(&cache->stats.demotion);
atomic_inc(&cache->stats.promotion);
demote_then_promote(cache, structs, lookup_result.old_oblock,
block, lookup_result.cblock,
ool.cell, new_ocell);
release_cell = false;
break;
default:
DMERR_LIMIT("%s: %s: erroring bio, unknown policy op: %u",
cache_device_name(cache), __func__,
(unsigned) lookup_result.op);
bio_io_error(bio);
}
if (release_cell)
cell_defer(cache, new_ocell, false);
}
static void process_bio(struct cache *cache, struct prealloc *structs,
struct bio *bio)
{
int r;
dm_oblock_t block = get_bio_block(cache, bio);
struct dm_bio_prison_cell *cell_prealloc, *new_ocell;
/*
* Check to see if that block is currently migrating.
*/
cell_prealloc = prealloc_get_cell(structs);
r = bio_detain(cache, block, bio, cell_prealloc,
(cell_free_fn) prealloc_put_cell,
structs, &new_ocell);
if (r > 0)
return;
process_cell(cache, structs, new_ocell);
}
static int need_commit_due_to_time(struct cache *cache)
{
return jiffies < cache->last_commit_jiffies ||
jiffies > cache->last_commit_jiffies + COMMIT_PERIOD;
}
/*
* A non-zero return indicates read_only or fail_io mode.
*/
static int commit(struct cache *cache, bool clean_shutdown)
{
int r;
if (get_cache_mode(cache) >= CM_READ_ONLY)
return -EINVAL;
atomic_inc(&cache->stats.commit_count);
r = dm_cache_commit(cache->cmd, clean_shutdown);
if (r)
metadata_operation_failed(cache, "dm_cache_commit", r);
return r;
}
static int commit_if_needed(struct cache *cache)
{
int r = 0;
if ((cache->commit_requested || need_commit_due_to_time(cache)) &&
dm_cache_changed_this_transaction(cache->cmd)) {
r = commit(cache, false);
cache->commit_requested = false;
cache->last_commit_jiffies = jiffies;
}
return r;
}
static void process_deferred_bios(struct cache *cache)
{
bool prealloc_used = false;
unsigned long flags;
struct bio_list bios;
struct bio *bio;
struct prealloc structs;
memset(&structs, 0, sizeof(structs));
bio_list_init(&bios);
spin_lock_irqsave(&cache->lock, flags);
bio_list_merge(&bios, &cache->deferred_bios);
bio_list_init(&cache->deferred_bios);
spin_unlock_irqrestore(&cache->lock, flags);
while (!bio_list_empty(&bios)) {
/*
* If we've got no free migration structs, and processing
* this bio might require one, we pause until there are some
* prepared mappings to process.
*/
prealloc_used = true;
if (prealloc_data_structs(cache, &structs)) {
spin_lock_irqsave(&cache->lock, flags);
bio_list_merge(&cache->deferred_bios, &bios);
spin_unlock_irqrestore(&cache->lock, flags);
break;
}
bio = bio_list_pop(&bios);
if (bio->bi_rw & REQ_FLUSH)
process_flush_bio(cache, bio);
else if (bio->bi_rw & REQ_DISCARD)
process_discard_bio(cache, &structs, bio);
else
process_bio(cache, &structs, bio);
}
if (prealloc_used)
prealloc_free_structs(cache, &structs);
}
static void process_deferred_cells(struct cache *cache)
{
bool prealloc_used = false;
unsigned long flags;
struct dm_bio_prison_cell *cell, *tmp;
struct list_head cells;
struct prealloc structs;
memset(&structs, 0, sizeof(structs));
INIT_LIST_HEAD(&cells);
spin_lock_irqsave(&cache->lock, flags);
list_splice_init(&cache->deferred_cells, &cells);
spin_unlock_irqrestore(&cache->lock, flags);
list_for_each_entry_safe(cell, tmp, &cells, user_list) {
/*
* If we've got no free migration structs, and processing
* this bio might require one, we pause until there are some
* prepared mappings to process.
*/
prealloc_used = true;
if (prealloc_data_structs(cache, &structs)) {
spin_lock_irqsave(&cache->lock, flags);
list_splice(&cells, &cache->deferred_cells);
spin_unlock_irqrestore(&cache->lock, flags);
break;
}
process_cell(cache, &structs, cell);
}
if (prealloc_used)
prealloc_free_structs(cache, &structs);
}
static void process_deferred_flush_bios(struct cache *cache, bool submit_bios)
{
unsigned long flags;
struct bio_list bios;
struct bio *bio;
bio_list_init(&bios);
spin_lock_irqsave(&cache->lock, flags);
bio_list_merge(&bios, &cache->deferred_flush_bios);
bio_list_init(&cache->deferred_flush_bios);
spin_unlock_irqrestore(&cache->lock, flags);
/*
* These bios have already been through inc_ds()
*/
while ((bio = bio_list_pop(&bios)))
submit_bios ? accounted_request(cache, bio) : bio_io_error(bio);
}
static void process_deferred_writethrough_bios(struct cache *cache)
{
unsigned long flags;
struct bio_list bios;
struct bio *bio;
bio_list_init(&bios);
spin_lock_irqsave(&cache->lock, flags);
bio_list_merge(&bios, &cache->deferred_writethrough_bios);
bio_list_init(&cache->deferred_writethrough_bios);
spin_unlock_irqrestore(&cache->lock, flags);
/*
* These bios have already been through inc_ds()
*/
while ((bio = bio_list_pop(&bios)))
accounted_request(cache, bio);
}
static void writeback_some_dirty_blocks(struct cache *cache)
{
bool prealloc_used = false;
dm_oblock_t oblock;
dm_cblock_t cblock;
struct prealloc structs;
struct dm_bio_prison_cell *old_ocell;
bool busy = !iot_idle_for(&cache->origin_tracker, HZ);
memset(&structs, 0, sizeof(structs));
while (spare_migration_bandwidth(cache)) {
if (policy_writeback_work(cache->policy, &oblock, &cblock, busy))
break; /* no work to do */
prealloc_used = true;
if (prealloc_data_structs(cache, &structs) ||
get_cell(cache, oblock, &structs, &old_ocell)) {
policy_set_dirty(cache->policy, oblock);
break;
}
writeback(cache, &structs, oblock, cblock, old_ocell);
}
if (prealloc_used)
prealloc_free_structs(cache, &structs);
}
/*----------------------------------------------------------------
* Invalidations.
* Dropping something from the cache *without* writing back.
*--------------------------------------------------------------*/
static void process_invalidation_request(struct cache *cache, struct invalidation_request *req)
{
int r = 0;
uint64_t begin = from_cblock(req->cblocks->begin);
uint64_t end = from_cblock(req->cblocks->end);
while (begin != end) {
r = policy_remove_cblock(cache->policy, to_cblock(begin));
if (!r) {
r = dm_cache_remove_mapping(cache->cmd, to_cblock(begin));
if (r) {
metadata_operation_failed(cache, "dm_cache_remove_mapping", r);
break;
}
} else if (r == -ENODATA) {
/* harmless, already unmapped */
r = 0;
} else {
DMERR("%s: policy_remove_cblock failed", cache_device_name(cache));
break;
}
begin++;
}
cache->commit_requested = true;
req->err = r;
atomic_set(&req->complete, 1);
wake_up(&req->result_wait);
}
static void process_invalidation_requests(struct cache *cache)
{
struct list_head list;
struct invalidation_request *req, *tmp;
INIT_LIST_HEAD(&list);
spin_lock(&cache->invalidation_lock);
list_splice_init(&cache->invalidation_requests, &list);
spin_unlock(&cache->invalidation_lock);
list_for_each_entry_safe (req, tmp, &list, list)
process_invalidation_request(cache, req);
}
/*----------------------------------------------------------------
* Main worker loop
*--------------------------------------------------------------*/
static bool is_quiescing(struct cache *cache)
{
return atomic_read(&cache->quiescing);
}
static void ack_quiescing(struct cache *cache)
{
if (is_quiescing(cache)) {
atomic_inc(&cache->quiescing_ack);
wake_up(&cache->quiescing_wait);
}
}
static void wait_for_quiescing_ack(struct cache *cache)
{
wait_event(cache->quiescing_wait, atomic_read(&cache->quiescing_ack));
}
static void start_quiescing(struct cache *cache)
{
atomic_inc(&cache->quiescing);
wait_for_quiescing_ack(cache);
}
static void stop_quiescing(struct cache *cache)
{
atomic_set(&cache->quiescing, 0);
atomic_set(&cache->quiescing_ack, 0);
}
static void wait_for_migrations(struct cache *cache)
{
wait_event(cache->migration_wait, !atomic_read(&cache->nr_allocated_migrations));
}
static void stop_worker(struct cache *cache)
{
cancel_delayed_work(&cache->waker);
flush_workqueue(cache->wq);
}
static void requeue_deferred_cells(struct cache *cache)
{
unsigned long flags;
struct list_head cells;
struct dm_bio_prison_cell *cell, *tmp;
INIT_LIST_HEAD(&cells);
spin_lock_irqsave(&cache->lock, flags);
list_splice_init(&cache->deferred_cells, &cells);
spin_unlock_irqrestore(&cache->lock, flags);
list_for_each_entry_safe(cell, tmp, &cells, user_list)
cell_requeue(cache, cell);
}
static void requeue_deferred_bios(struct cache *cache)
{
struct bio *bio;
struct bio_list bios;
bio_list_init(&bios);
bio_list_merge(&bios, &cache->deferred_bios);
bio_list_init(&cache->deferred_bios);
while ((bio = bio_list_pop(&bios))) {
bio->bi_error = DM_ENDIO_REQUEUE;
bio_endio(bio);
}
}
static int more_work(struct cache *cache)
{
if (is_quiescing(cache))
return !list_empty(&cache->quiesced_migrations) ||
!list_empty(&cache->completed_migrations) ||
!list_empty(&cache->need_commit_migrations);
else
return !bio_list_empty(&cache->deferred_bios) ||
!list_empty(&cache->deferred_cells) ||
!bio_list_empty(&cache->deferred_flush_bios) ||
!bio_list_empty(&cache->deferred_writethrough_bios) ||
!list_empty(&cache->quiesced_migrations) ||
!list_empty(&cache->completed_migrations) ||
!list_empty(&cache->need_commit_migrations) ||
cache->invalidate;
}
static void do_worker(struct work_struct *ws)
{
struct cache *cache = container_of(ws, struct cache, worker);
do {
if (!is_quiescing(cache)) {
writeback_some_dirty_blocks(cache);
process_deferred_writethrough_bios(cache);
process_deferred_bios(cache);
process_deferred_cells(cache);
process_invalidation_requests(cache);
}
process_migrations(cache, &cache->quiesced_migrations, issue_copy_or_discard);
process_migrations(cache, &cache->completed_migrations, complete_migration);
if (commit_if_needed(cache)) {
process_deferred_flush_bios(cache, false);
process_migrations(cache, &cache->need_commit_migrations, migration_failure);
} else {
process_deferred_flush_bios(cache, true);
process_migrations(cache, &cache->need_commit_migrations,
migration_success_post_commit);
}
ack_quiescing(cache);
} while (more_work(cache));
}
/*
* We want to commit periodically so that not too much
* unwritten metadata builds up.
*/
static void do_waker(struct work_struct *ws)
{
struct cache *cache = container_of(to_delayed_work(ws), struct cache, waker);
policy_tick(cache->policy, true);
wake_worker(cache);
queue_delayed_work(cache->wq, &cache->waker, COMMIT_PERIOD);
}
/*----------------------------------------------------------------*/
static int is_congested(struct dm_dev *dev, int bdi_bits)
{
struct request_queue *q = bdev_get_queue(dev->bdev);
return bdi_congested(&q->backing_dev_info, bdi_bits);
}
static int cache_is_congested(struct dm_target_callbacks *cb, int bdi_bits)
{
struct cache *cache = container_of(cb, struct cache, callbacks);
return is_congested(cache->origin_dev, bdi_bits) ||
is_congested(cache->cache_dev, bdi_bits);
}
/*----------------------------------------------------------------
* Target methods
*--------------------------------------------------------------*/
/*
* This function gets called on the error paths of the constructor, so we
* have to cope with a partially initialised struct.
*/
static void destroy(struct cache *cache)
{
unsigned i;
mempool_destroy(cache->migration_pool);
if (cache->all_io_ds)
dm_deferred_set_destroy(cache->all_io_ds);
if (cache->prison)
dm_bio_prison_destroy(cache->prison);
if (cache->wq)
destroy_workqueue(cache->wq);
if (cache->dirty_bitset)
free_bitset(cache->dirty_bitset);
if (cache->discard_bitset)
free_bitset(cache->discard_bitset);
if (cache->copier)
dm_kcopyd_client_destroy(cache->copier);
if (cache->cmd)
dm_cache_metadata_close(cache->cmd);
if (cache->metadata_dev)
dm_put_device(cache->ti, cache->metadata_dev);
if (cache->origin_dev)
dm_put_device(cache->ti, cache->origin_dev);
if (cache->cache_dev)
dm_put_device(cache->ti, cache->cache_dev);
if (cache->policy)
dm_cache_policy_destroy(cache->policy);
for (i = 0; i < cache->nr_ctr_args ; i++)
kfree(cache->ctr_args[i]);
kfree(cache->ctr_args);
kfree(cache);
}
static void cache_dtr(struct dm_target *ti)
{
struct cache *cache = ti->private;
destroy(cache);
}
static sector_t get_dev_size(struct dm_dev *dev)
{
return i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT;
}
/*----------------------------------------------------------------*/
/*
* Construct a cache device mapping.
*
* cache <metadata dev> <cache dev> <origin dev> <block size>
* <#feature args> [<feature arg>]*
* <policy> <#policy args> [<policy arg>]*
*
* metadata dev : fast device holding the persistent metadata
* cache dev : fast device holding cached data blocks
* origin dev : slow device holding original data blocks
* block size : cache unit size in sectors
*
* #feature args : number of feature arguments passed
* feature args : writethrough. (The default is writeback.)
*
* policy : the replacement policy to use
* #policy args : an even number of policy arguments corresponding
* to key/value pairs passed to the policy
* policy args : key/value pairs passed to the policy
* E.g. 'sequential_threshold 1024'
* See cache-policies.txt for details.
*
* Optional feature arguments are:
* writethrough : write through caching that prohibits cache block
* content from being different from origin block content.
* Without this argument, the default behaviour is to write
* back cache block contents later for performance reasons,
* so they may differ from the corresponding origin blocks.
*/
struct cache_args {
struct dm_target *ti;
struct dm_dev *metadata_dev;
struct dm_dev *cache_dev;
sector_t cache_sectors;
struct dm_dev *origin_dev;
sector_t origin_sectors;
uint32_t block_size;
const char *policy_name;
int policy_argc;
const char **policy_argv;
struct cache_features features;
};
static void destroy_cache_args(struct cache_args *ca)
{
if (ca->metadata_dev)
dm_put_device(ca->ti, ca->metadata_dev);
if (ca->cache_dev)
dm_put_device(ca->ti, ca->cache_dev);
if (ca->origin_dev)
dm_put_device(ca->ti, ca->origin_dev);
kfree(ca);
}
static bool at_least_one_arg(struct dm_arg_set *as, char **error)
{
if (!as->argc) {
*error = "Insufficient args";
return false;
}
return true;
}
static int parse_metadata_dev(struct cache_args *ca, struct dm_arg_set *as,
char **error)
{
int r;
sector_t metadata_dev_size;
char b[BDEVNAME_SIZE];
if (!at_least_one_arg(as, error))
return -EINVAL;
r = dm_get_device(ca->ti, dm_shift_arg(as), FMODE_READ | FMODE_WRITE,
&ca->metadata_dev);
if (r) {
*error = "Error opening metadata device";
return r;
}
metadata_dev_size = get_dev_size(ca->metadata_dev);
if (metadata_dev_size > DM_CACHE_METADATA_MAX_SECTORS_WARNING)
DMWARN("Metadata device %s is larger than %u sectors: excess space will not be used.",
bdevname(ca->metadata_dev->bdev, b), THIN_METADATA_MAX_SECTORS);
return 0;
}
static int parse_cache_dev(struct cache_args *ca, struct dm_arg_set *as,
char **error)
{
int r;
if (!at_least_one_arg(as, error))
return -EINVAL;
r = dm_get_device(ca->ti, dm_shift_arg(as), FMODE_READ | FMODE_WRITE,
&ca->cache_dev);
if (r) {
*error = "Error opening cache device";
return r;
}
ca->cache_sectors = get_dev_size(ca->cache_dev);
return 0;
}
static int parse_origin_dev(struct cache_args *ca, struct dm_arg_set *as,
char **error)
{
int r;
if (!at_least_one_arg(as, error))
return -EINVAL;
r = dm_get_device(ca->ti, dm_shift_arg(as), FMODE_READ | FMODE_WRITE,
&ca->origin_dev);
if (r) {
*error = "Error opening origin device";
return r;
}
ca->origin_sectors = get_dev_size(ca->origin_dev);
if (ca->ti->len > ca->origin_sectors) {
*error = "Device size larger than cached device";
return -EINVAL;
}
return 0;
}
static int parse_block_size(struct cache_args *ca, struct dm_arg_set *as,
char **error)
{
unsigned long block_size;
if (!at_least_one_arg(as, error))
return -EINVAL;
if (kstrtoul(dm_shift_arg(as), 10, &block_size) || !block_size ||
block_size < DATA_DEV_BLOCK_SIZE_MIN_SECTORS ||
block_size > DATA_DEV_BLOCK_SIZE_MAX_SECTORS ||
block_size & (DATA_DEV_BLOCK_SIZE_MIN_SECTORS - 1)) {
*error = "Invalid data block size";
return -EINVAL;
}
if (block_size > ca->cache_sectors) {
*error = "Data block size is larger than the cache device";
return -EINVAL;
}
ca->block_size = block_size;
return 0;
}
static void init_features(struct cache_features *cf)
{
cf->mode = CM_WRITE;
cf->io_mode = CM_IO_WRITEBACK;
}
static int parse_features(struct cache_args *ca, struct dm_arg_set *as,
char **error)
{
static struct dm_arg _args[] = {
{0, 1, "Invalid number of cache feature arguments"},
};
int r;
unsigned argc;
const char *arg;
struct cache_features *cf = &ca->features;
init_features(cf);
r = dm_read_arg_group(_args, as, &argc, error);
if (r)
return -EINVAL;
while (argc--) {
arg = dm_shift_arg(as);
if (!strcasecmp(arg, "writeback"))
cf->io_mode = CM_IO_WRITEBACK;
else if (!strcasecmp(arg, "writethrough"))
cf->io_mode = CM_IO_WRITETHROUGH;
else if (!strcasecmp(arg, "passthrough"))
cf->io_mode = CM_IO_PASSTHROUGH;
else {
*error = "Unrecognised cache feature requested";
return -EINVAL;
}
}
return 0;
}
static int parse_policy(struct cache_args *ca, struct dm_arg_set *as,
char **error)
{
static struct dm_arg _args[] = {
{0, 1024, "Invalid number of policy arguments"},
};
int r;
if (!at_least_one_arg(as, error))
return -EINVAL;
ca->policy_name = dm_shift_arg(as);
r = dm_read_arg_group(_args, as, &ca->policy_argc, error);
if (r)
return -EINVAL;
ca->policy_argv = (const char **)as->argv;
dm_consume_args(as, ca->policy_argc);
return 0;
}
static int parse_cache_args(struct cache_args *ca, int argc, char **argv,
char **error)
{
int r;
struct dm_arg_set as;
as.argc = argc;
as.argv = argv;
r = parse_metadata_dev(ca, &as, error);
if (r)
return r;
r = parse_cache_dev(ca, &as, error);
if (r)
return r;
r = parse_origin_dev(ca, &as, error);
if (r)
return r;
r = parse_block_size(ca, &as, error);
if (r)
return r;
r = parse_features(ca, &as, error);
if (r)
return r;
r = parse_policy(ca, &as, error);
if (r)
return r;
return 0;
}
/*----------------------------------------------------------------*/
static struct kmem_cache *migration_cache;
#define NOT_CORE_OPTION 1
static int process_config_option(struct cache *cache, const char *key, const char *value)
{
unsigned long tmp;
if (!strcasecmp(key, "migration_threshold")) {
if (kstrtoul(value, 10, &tmp))
return -EINVAL;
cache->migration_threshold = tmp;
return 0;
}
return NOT_CORE_OPTION;
}
static int set_config_value(struct cache *cache, const char *key, const char *value)
{
int r = process_config_option(cache, key, value);
if (r == NOT_CORE_OPTION)
r = policy_set_config_value(cache->policy, key, value);
if (r)
DMWARN("bad config value for %s: %s", key, value);
return r;
}
static int set_config_values(struct cache *cache, int argc, const char **argv)
{
int r = 0;
if (argc & 1) {
DMWARN("Odd number of policy arguments given but they should be <key> <value> pairs.");
return -EINVAL;
}
while (argc) {
r = set_config_value(cache, argv[0], argv[1]);
if (r)
break;
argc -= 2;
argv += 2;
}
return r;
}
static int create_cache_policy(struct cache *cache, struct cache_args *ca,
char **error)
{
struct dm_cache_policy *p = dm_cache_policy_create(ca->policy_name,
cache->cache_size,
cache->origin_sectors,
cache->sectors_per_block);
if (IS_ERR(p)) {
*error = "Error creating cache's policy";
return PTR_ERR(p);
}
cache->policy = p;
return 0;
}
/*
* We want the discard block size to be at least the size of the cache
* block size and have no more than 2^14 discard blocks across the origin.
*/
#define MAX_DISCARD_BLOCKS (1 << 14)
static bool too_many_discard_blocks(sector_t discard_block_size,
sector_t origin_size)
{
(void) sector_div(origin_size, discard_block_size);
return origin_size > MAX_DISCARD_BLOCKS;
}
static sector_t calculate_discard_block_size(sector_t cache_block_size,
sector_t origin_size)
{
sector_t discard_block_size = cache_block_size;
if (origin_size)
while (too_many_discard_blocks(discard_block_size, origin_size))
discard_block_size *= 2;
return discard_block_size;
}
static void set_cache_size(struct cache *cache, dm_cblock_t size)
{
dm_block_t nr_blocks = from_cblock(size);
if (nr_blocks > (1 << 20) && cache->cache_size != size)
DMWARN_LIMIT("You have created a cache device with a lot of individual cache blocks (%llu)\n"
"All these mappings can consume a lot of kernel memory, and take some time to read/write.\n"
"Please consider increasing the cache block size to reduce the overall cache block count.",
(unsigned long long) nr_blocks);
cache->cache_size = size;
}
#define DEFAULT_MIGRATION_THRESHOLD 2048
static int cache_create(struct cache_args *ca, struct cache **result)
{
int r = 0;
char **error = &ca->ti->error;
struct cache *cache;
struct dm_target *ti = ca->ti;
dm_block_t origin_blocks;
struct dm_cache_metadata *cmd;
bool may_format = ca->features.mode == CM_WRITE;
cache = kzalloc(sizeof(*cache), GFP_KERNEL);
if (!cache)
return -ENOMEM;
cache->ti = ca->ti;
ti->private = cache;
ti->num_flush_bios = 2;
ti->flush_supported = true;
ti->num_discard_bios = 1;
ti->discards_supported = true;
ti->discard_zeroes_data_unsupported = true;
ti->split_discard_bios = false;
cache->features = ca->features;
ti->per_io_data_size = get_per_bio_data_size(cache);
cache->callbacks.congested_fn = cache_is_congested;
dm_table_add_target_callbacks(ti->table, &cache->callbacks);
cache->metadata_dev = ca->metadata_dev;
cache->origin_dev = ca->origin_dev;
cache->cache_dev = ca->cache_dev;
ca->metadata_dev = ca->origin_dev = ca->cache_dev = NULL;
/* FIXME: factor out this whole section */
origin_blocks = cache->origin_sectors = ca->origin_sectors;
origin_blocks = block_div(origin_blocks, ca->block_size);
cache->origin_blocks = to_oblock(origin_blocks);
cache->sectors_per_block = ca->block_size;
if (dm_set_target_max_io_len(ti, cache->sectors_per_block)) {
r = -EINVAL;
goto bad;
}
if (ca->block_size & (ca->block_size - 1)) {
dm_block_t cache_size = ca->cache_sectors;
cache->sectors_per_block_shift = -1;
cache_size = block_div(cache_size,