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dm thin: prepare to separate bio_prison code 

The bio prison code will be useful to share with future DM targets.

Prepare to move this code into a separate module, adding a dm prefix
to structures and functions that will be exported.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Snitzer 2012-10-12 21:02:10 +01:00 коммит произвёл Alasdair G Kergon
Родитель 28eed34e76
Коммит 44feb387f6
1 изменённых файлов: 131 добавлений и 90 удалений
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217
drivers/md/dm-thin.c
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@ -58,7 +58,7 @@
* i) plug io further to this physical block. (see bio_prison code). * i) plug io further to this physical block. (see bio_prison code).
* *
* ii) quiesce any read io to that shared data block. Obviously * ii) quiesce any read io to that shared data block. Obviously
* including all devices that share this block. (see deferred_set code) * including all devices that share this block. (see dm_deferred_set code)
* *
* iii) copy the data block to a newly allocate block. This step can be * iii) copy the data block to a newly allocate block. This step can be
* missed out if the io covers the block. (schedule_copy). * missed out if the io covers the block. (schedule_copy).
@ -104,9 +104,9 @@
* by a key, multiple bios can be in the same cell. When the cell is * by a key, multiple bios can be in the same cell. When the cell is
* subsequently unlocked the bios become available. * subsequently unlocked the bios become available.
*/ */
struct bio_prison; struct dm_bio_prison;
struct cell_key { struct dm_cell_key {
int virtual; int virtual;
dm_thin_id dev; dm_thin_id dev;
dm_block_t block; dm_block_t block;
@ -114,13 +114,13 @@ struct cell_key {
struct dm_bio_prison_cell { struct dm_bio_prison_cell {
struct hlist_node list; struct hlist_node list;
struct bio_prison *prison; struct dm_bio_prison *prison;
struct cell_key key; struct dm_cell_key key;
struct bio *holder; struct bio *holder;
struct bio_list bios; struct bio_list bios;
}; };
struct bio_prison { struct dm_bio_prison {
spinlock_t lock; spinlock_t lock;
mempool_t *cell_pool; mempool_t *cell_pool;
@ -148,13 +148,13 @@ static struct kmem_cache *_cell_cache;
* @nr_cells should be the number of cells you want in use _concurrently_. * @nr_cells should be the number of cells you want in use _concurrently_.
* Don't confuse it with the number of distinct keys. * Don't confuse it with the number of distinct keys.
*/ */
static struct bio_prison *prison_create(unsigned nr_cells) static struct dm_bio_prison *dm_bio_prison_create(unsigned nr_cells)
{ {
unsigned i; unsigned i;
uint32_t nr_buckets = calc_nr_buckets(nr_cells); uint32_t nr_buckets = calc_nr_buckets(nr_cells);
size_t len = sizeof(struct bio_prison) + size_t len = sizeof(struct dm_bio_prison) +
(sizeof(struct hlist_head) * nr_buckets); (sizeof(struct hlist_head) * nr_buckets);
struct bio_prison *prison = kmalloc(len, GFP_KERNEL); struct dm_bio_prison *prison = kmalloc(len, GFP_KERNEL);
if (!prison) if (!prison)
return NULL; return NULL;
@ -175,13 +175,13 @@ static struct bio_prison *prison_create(unsigned nr_cells)
return prison; return prison;
} }
static void prison_destroy(struct bio_prison *prison) static void dm_bio_prison_destroy(struct dm_bio_prison *prison)
{ {
mempool_destroy(prison->cell_pool); mempool_destroy(prison->cell_pool);
kfree(prison); kfree(prison);
} }
static uint32_t hash_key(struct bio_prison *prison, struct cell_key *key) static uint32_t hash_key(struct dm_bio_prison *prison, struct dm_cell_key *key)
{ {
const unsigned long BIG_PRIME = 4294967291UL; const unsigned long BIG_PRIME = 4294967291UL;
uint64_t hash = key->block * BIG_PRIME; uint64_t hash = key->block * BIG_PRIME;
@ -189,7 +189,7 @@ static uint32_t hash_key(struct bio_prison *prison, struct cell_key *key)
return (uint32_t) (hash & prison->hash_mask); return (uint32_t) (hash & prison->hash_mask);
} }
static int keys_equal(struct cell_key *lhs, struct cell_key *rhs) static int keys_equal(struct dm_cell_key *lhs, struct dm_cell_key *rhs)
{ {
return (lhs->virtual == rhs->virtual) && return (lhs->virtual == rhs->virtual) &&
(lhs->dev == rhs->dev) && (lhs->dev == rhs->dev) &&
@ -197,7 +197,7 @@ static int keys_equal(struct cell_key *lhs, struct cell_key *rhs)
} }
static struct dm_bio_prison_cell *__search_bucket(struct hlist_head *bucket, static struct dm_bio_prison_cell *__search_bucket(struct hlist_head *bucket,
struct cell_key *key) struct dm_cell_key *key)
{ {
struct dm_bio_prison_cell *cell; struct dm_bio_prison_cell *cell;
struct hlist_node *tmp; struct hlist_node *tmp;
@ -215,7 +215,7 @@ static struct dm_bio_prison_cell *__search_bucket(struct hlist_head *bucket,
* *
* Returns 1 if the cell was already held, 0 if @inmate is the new holder. * Returns 1 if the cell was already held, 0 if @inmate is the new holder.
*/ */
static int bio_detain(struct bio_prison *prison, struct cell_key *key, static int dm_bio_detain(struct dm_bio_prison *prison, struct dm_cell_key *key,
struct bio *inmate, struct dm_bio_prison_cell **ref) struct bio *inmate, struct dm_bio_prison_cell **ref)
{ {
int r = 1; int r = 1;
@ -277,7 +277,7 @@ out:
*/ */
static void __cell_release(struct dm_bio_prison_cell *cell, struct bio_list *inmates) static void __cell_release(struct dm_bio_prison_cell *cell, struct bio_list *inmates)
{ {
struct bio_prison *prison = cell->prison; struct dm_bio_prison *prison = cell->prison;
hlist_del(&cell->list); hlist_del(&cell->list);
@ -289,10 +289,10 @@ static void __cell_release(struct dm_bio_prison_cell *cell, struct bio_list *inm
mempool_free(cell, prison->cell_pool); mempool_free(cell, prison->cell_pool);
} }
static void cell_release(struct dm_bio_prison_cell *cell, struct bio_list *bios) static void dm_cell_release(struct dm_bio_prison_cell *cell, struct bio_list *bios)
{ {
unsigned long flags; unsigned long flags;
struct bio_prison *prison = cell->prison; struct dm_bio_prison *prison = cell->prison;
spin_lock_irqsave(&prison->lock, flags); spin_lock_irqsave(&prison->lock, flags);
__cell_release(cell, bios); __cell_release(cell, bios);
@ -313,10 +313,10 @@ static void __cell_release_singleton(struct dm_bio_prison_cell *cell, struct bio
__cell_release(cell, NULL); __cell_release(cell, NULL);
} }
static void cell_release_singleton(struct dm_bio_prison_cell *cell, struct bio *bio) static void dm_cell_release_singleton(struct dm_bio_prison_cell *cell, struct bio *bio)
{ {
unsigned long flags; unsigned long flags;
struct bio_prison *prison = cell->prison; struct dm_bio_prison *prison = cell->prison;
spin_lock_irqsave(&prison->lock, flags); spin_lock_irqsave(&prison->lock, flags);
__cell_release_singleton(cell, bio); __cell_release_singleton(cell, bio);
@ -329,7 +329,7 @@ static void cell_release_singleton(struct dm_bio_prison_cell *cell, struct bio *
static void __cell_release_no_holder(struct dm_bio_prison_cell *cell, static void __cell_release_no_holder(struct dm_bio_prison_cell *cell,
struct bio_list *inmates) struct bio_list *inmates)
{ {
struct bio_prison *prison = cell->prison; struct dm_bio_prison *prison = cell->prison;
hlist_del(&cell->list); hlist_del(&cell->list);
bio_list_merge(inmates, &cell->bios); bio_list_merge(inmates, &cell->bios);
@ -337,20 +337,20 @@ static void __cell_release_no_holder(struct dm_bio_prison_cell *cell,
mempool_free(cell, prison->cell_pool); mempool_free(cell, prison->cell_pool);
} }
static void cell_release_no_holder(struct dm_bio_prison_cell *cell, static void dm_cell_release_no_holder(struct dm_bio_prison_cell *cell,
struct bio_list *inmates) struct bio_list *inmates)
{ {
unsigned long flags; unsigned long flags;
struct bio_prison *prison = cell->prison; struct dm_bio_prison *prison = cell->prison;
spin_lock_irqsave(&prison->lock, flags); spin_lock_irqsave(&prison->lock, flags);
__cell_release_no_holder(cell, inmates); __cell_release_no_holder(cell, inmates);
spin_unlock_irqrestore(&prison->lock, flags); spin_unlock_irqrestore(&prison->lock, flags);
} }
static void cell_error(struct dm_bio_prison_cell *cell) static void dm_cell_error(struct dm_bio_prison_cell *cell)
{ {
struct bio_prison *prison = cell->prison; struct dm_bio_prison *prison = cell->prison;
struct bio_list bios; struct bio_list bios;
struct bio *bio; struct bio *bio;
unsigned long flags; unsigned long flags;
@ -374,23 +374,28 @@ static void cell_error(struct dm_bio_prison_cell *cell)
* new mapping could free the old block that the read bios are mapped to. * new mapping could free the old block that the read bios are mapped to.
*/ */
struct deferred_set; struct dm_deferred_set;
struct deferred_entry { struct dm_deferred_entry {
struct deferred_set *ds; struct dm_deferred_set *ds;
unsigned count; unsigned count;
struct list_head work_items; struct list_head work_items;
}; };
struct deferred_set { struct dm_deferred_set {
spinlock_t lock; spinlock_t lock;
unsigned current_entry; unsigned current_entry;
unsigned sweeper; unsigned sweeper;
struct deferred_entry entries[DEFERRED_SET_SIZE]; struct dm_deferred_entry entries[DEFERRED_SET_SIZE];
}; };
static void ds_init(struct deferred_set *ds) static struct dm_deferred_set *dm_deferred_set_create(void)
{ {
int i; int i;
struct dm_deferred_set *ds;
ds = kmalloc(sizeof(*ds), GFP_KERNEL);
if (!ds)
return NULL;
spin_lock_init(&ds->lock); spin_lock_init(&ds->lock);
ds->current_entry = 0; ds->current_entry = 0;
@ -400,12 +405,19 @@ static void ds_init(struct deferred_set *ds)
ds->entries[i].count = 0; ds->entries[i].count = 0;
INIT_LIST_HEAD(&ds->entries[i].work_items); INIT_LIST_HEAD(&ds->entries[i].work_items);
} }
return ds;
} }
static struct deferred_entry *ds_inc(struct deferred_set *ds) static void dm_deferred_set_destroy(struct dm_deferred_set *ds)
{
kfree(ds);
}
static struct dm_deferred_entry *dm_deferred_entry_inc(struct dm_deferred_set *ds)
{ {
unsigned long flags; unsigned long flags;
struct deferred_entry *entry; struct dm_deferred_entry *entry;
spin_lock_irqsave(&ds->lock, flags); spin_lock_irqsave(&ds->lock, flags);
entry = ds->entries + ds->current_entry; entry = ds->entries + ds->current_entry;
@ -420,7 +432,7 @@ static unsigned ds_next(unsigned index)
return (index + 1) % DEFERRED_SET_SIZE; return (index + 1) % DEFERRED_SET_SIZE;
} }
static void __sweep(struct deferred_set *ds, struct list_head *head) static void __sweep(struct dm_deferred_set *ds, struct list_head *head)
{ {
while ((ds->sweeper != ds->current_entry) && while ((ds->sweeper != ds->current_entry) &&
!ds->entries[ds->sweeper].count) { !ds->entries[ds->sweeper].count) {
@ -432,7 +444,7 @@ static void __sweep(struct deferred_set *ds, struct list_head *head)
list_splice_init(&ds->entries[ds->sweeper].work_items, head); list_splice_init(&ds->entries[ds->sweeper].work_items, head);
} }
static void ds_dec(struct deferred_entry *entry, struct list_head *head) static void dm_deferred_entry_dec(struct dm_deferred_entry *entry, struct list_head *head)
{ {
unsigned long flags; unsigned long flags;
@ -446,7 +458,7 @@ static void ds_dec(struct deferred_entry *entry, struct list_head *head)
/* /*
* Returns 1 if deferred or 0 if no pending items to delay job. * Returns 1 if deferred or 0 if no pending items to delay job.
*/ */
static int ds_add_work(struct deferred_set *ds, struct list_head *work) static int dm_deferred_set_add_work(struct dm_deferred_set *ds, struct list_head *work)
{ {
int r = 1; int r = 1;
unsigned long flags; unsigned long flags;
@ -467,13 +479,28 @@ static int ds_add_work(struct deferred_set *ds, struct list_head *work)
return r; return r;
} }
static int __init dm_bio_prison_init(void)
{
_cell_cache = KMEM_CACHE(dm_bio_prison_cell, 0);
if (!_cell_cache)
return -ENOMEM;
return 0;
}
static void __exit dm_bio_prison_exit(void)
{
kmem_cache_destroy(_cell_cache);
_cell_cache = NULL;
}
/*----------------------------------------------------------------*/ /*----------------------------------------------------------------*/
/* /*
* Key building. * Key building.
*/ */
static void build_data_key(struct dm_thin_device *td, static void build_data_key(struct dm_thin_device *td,
dm_block_t b, struct cell_key *key) dm_block_t b, struct dm_cell_key *key)
{ {
key->virtual = 0; key->virtual = 0;
key->dev = dm_thin_dev_id(td); key->dev = dm_thin_dev_id(td);
@ -481,7 +508,7 @@ static void build_data_key(struct dm_thin_device *td,
} }
static void build_virtual_key(struct dm_thin_device *td, dm_block_t b, static void build_virtual_key(struct dm_thin_device *td, dm_block_t b,
struct cell_key *key) struct dm_cell_key *key)
{ {
key->virtual = 1; key->virtual = 1;
key->dev = dm_thin_dev_id(td); key->dev = dm_thin_dev_id(td);
@ -534,7 +561,7 @@ struct pool {
unsigned low_water_triggered:1; /* A dm event has been sent */ unsigned low_water_triggered:1; /* A dm event has been sent */
unsigned no_free_space:1; /* A -ENOSPC warning has been issued */ unsigned no_free_space:1; /* A -ENOSPC warning has been issued */
struct bio_prison *prison; struct dm_bio_prison *prison;
struct dm_kcopyd_client *copier; struct dm_kcopyd_client *copier;
struct workqueue_struct *wq; struct workqueue_struct *wq;
@ -552,8 +579,8 @@ struct pool {
struct bio_list retry_on_resume_list; struct bio_list retry_on_resume_list;
struct deferred_set shared_read_ds; struct dm_deferred_set *shared_read_ds;
struct deferred_set all_io_ds; struct dm_deferred_set *all_io_ds;
struct dm_thin_new_mapping *next_mapping; struct dm_thin_new_mapping *next_mapping;
mempool_t *mapping_pool; mempool_t *mapping_pool;
@ -660,8 +687,8 @@ static struct pool *__pool_table_lookup_metadata_dev(struct block_device *md_dev
struct dm_thin_endio_hook { struct dm_thin_endio_hook {
struct thin_c *tc; struct thin_c *tc;
struct deferred_entry *shared_read_entry; struct dm_deferred_entry *shared_read_entry;
struct deferred_entry *all_io_entry; struct dm_deferred_entry *all_io_entry;
struct dm_thin_new_mapping *overwrite_mapping; struct dm_thin_new_mapping *overwrite_mapping;
}; };
@ -877,7 +904,7 @@ static void cell_defer(struct thin_c *tc, struct dm_bio_prison_cell *cell,
unsigned long flags; unsigned long flags;
spin_lock_irqsave(&pool->lock, flags); spin_lock_irqsave(&pool->lock, flags);
cell_release(cell, &pool->deferred_bios); dm_cell_release(cell, &pool->deferred_bios);
spin_unlock_irqrestore(&tc->pool->lock, flags); spin_unlock_irqrestore(&tc->pool->lock, flags);
wake_worker(pool); wake_worker(pool);
@ -896,7 +923,7 @@ static void cell_defer_except(struct thin_c *tc, struct dm_bio_prison_cell *cell
bio_list_init(&bios); bio_list_init(&bios);
spin_lock_irqsave(&pool->lock, flags); spin_lock_irqsave(&pool->lock, flags);
cell_release_no_holder(cell, &pool->deferred_bios); dm_cell_release_no_holder(cell, &pool->deferred_bios);
spin_unlock_irqrestore(&pool->lock, flags); spin_unlock_irqrestore(&pool->lock, flags);
wake_worker(pool); wake_worker(pool);
@ -906,7 +933,7 @@ static void process_prepared_mapping_fail(struct dm_thin_new_mapping *m)
{ {
if (m->bio) if (m->bio)
m->bio->bi_end_io = m->saved_bi_end_io; m->bio->bi_end_io = m->saved_bi_end_io;
cell_error(m->cell); dm_cell_error(m->cell);
list_del(&m->list); list_del(&m->list);
mempool_free(m, m->tc->pool->mapping_pool); mempool_free(m, m->tc->pool->mapping_pool);
} }
@ -921,7 +948,7 @@ static void process_prepared_mapping(struct dm_thin_new_mapping *m)
bio->bi_end_io = m->saved_bi_end_io; bio->bi_end_io = m->saved_bi_end_io;
if (m->err) { if (m->err) {
cell_error(m->cell); dm_cell_error(m->cell);
goto out; goto out;
} }
@ -933,7 +960,7 @@ static void process_prepared_mapping(struct dm_thin_new_mapping *m)
r = dm_thin_insert_block(tc->td, m->virt_block, m->data_block); r = dm_thin_insert_block(tc->td, m->virt_block, m->data_block);
if (r) { if (r) {
DMERR("dm_thin_insert_block() failed"); DMERR("dm_thin_insert_block() failed");
cell_error(m->cell); dm_cell_error(m->cell);
goto out; goto out;
} }
@ -1067,7 +1094,7 @@ static void schedule_copy(struct thin_c *tc, dm_block_t virt_block,
m->err = 0; m->err = 0;
m->bio = NULL; m->bio = NULL;
if (!ds_add_work(&pool->shared_read_ds, &m->list)) if (!dm_deferred_set_add_work(pool->shared_read_ds, &m->list))
m->quiesced = 1; m->quiesced = 1;
/* /*
@ -1099,7 +1126,7 @@ static void schedule_copy(struct thin_c *tc, dm_block_t virt_block,
if (r < 0) { if (r < 0) {
mempool_free(m, pool->mapping_pool); mempool_free(m, pool->mapping_pool);
DMERR("dm_kcopyd_copy() failed"); DMERR("dm_kcopyd_copy() failed");
cell_error(cell); dm_cell_error(cell);
} }
} }
} }
@ -1164,7 +1191,7 @@ static void schedule_zero(struct thin_c *tc, dm_block_t virt_block,
if (r < 0) { if (r < 0) {
mempool_free(m, pool->mapping_pool); mempool_free(m, pool->mapping_pool);
DMERR("dm_kcopyd_zero() failed"); DMERR("dm_kcopyd_zero() failed");
cell_error(cell); dm_cell_error(cell);
} }
} }
} }
@ -1276,7 +1303,7 @@ static void no_space(struct dm_bio_prison_cell *cell)
struct bio_list bios; struct bio_list bios;
bio_list_init(&bios); bio_list_init(&bios);
cell_release(cell, &bios); dm_cell_release(cell, &bios);
while ((bio = bio_list_pop(&bios))) while ((bio = bio_list_pop(&bios)))
retry_on_resume(bio); retry_on_resume(bio);
@ -1288,13 +1315,13 @@ static void process_discard(struct thin_c *tc, struct bio *bio)
unsigned long flags; unsigned long flags;
struct pool *pool = tc->pool; struct pool *pool = tc->pool;
struct dm_bio_prison_cell *cell, *cell2; struct dm_bio_prison_cell *cell, *cell2;
struct cell_key key, key2; struct dm_cell_key key, key2;
dm_block_t block = get_bio_block(tc, bio); dm_block_t block = get_bio_block(tc, bio);
struct dm_thin_lookup_result lookup_result; struct dm_thin_lookup_result lookup_result;
struct dm_thin_new_mapping *m; struct dm_thin_new_mapping *m;
build_virtual_key(tc->td, block, &key); build_virtual_key(tc->td, block, &key);
if (bio_detain(tc->pool->prison, &key, bio, &cell)) if (dm_bio_detain(tc->pool->prison, &key, bio, &cell))
return; return;
r = dm_thin_find_block(tc->td, block, 1, &lookup_result); r = dm_thin_find_block(tc->td, block, 1, &lookup_result);
@ -1306,8 +1333,8 @@ static void process_discard(struct thin_c *tc, struct bio *bio)
* on this block. * on this block.
*/ */
build_data_key(tc->td, lookup_result.block, &key2); build_data_key(tc->td, lookup_result.block, &key2);
if (bio_detain(tc->pool->prison, &key2, bio, &cell2)) { if (dm_bio_detain(tc->pool->prison, &key2, bio, &cell2)) {
cell_release_singleton(cell, bio); dm_cell_release_singleton(cell, bio);
break; break;
} }
@ -1326,7 +1353,7 @@ static void process_discard(struct thin_c *tc, struct bio *bio)
m->err = 0; m->err = 0;
m->bio = bio; m->bio = bio;
if (!ds_add_work(&pool->all_io_ds, &m->list)) { if (!dm_deferred_set_add_work(pool->all_io_ds, &m->list)) {
spin_lock_irqsave(&pool->lock, flags); spin_lock_irqsave(&pool->lock, flags);
list_add(&m->list, &pool->prepared_discards); list_add(&m->list, &pool->prepared_discards);
spin_unlock_irqrestore(&pool->lock, flags); spin_unlock_irqrestore(&pool->lock, flags);
@ -1338,8 +1365,8 @@ static void process_discard(struct thin_c *tc, struct bio *bio)
* a block boundary. So we submit the discard of a * a block boundary. So we submit the discard of a
* partial block appropriately. * partial block appropriately.
*/ */
cell_release_singleton(cell, bio); dm_cell_release_singleton(cell, bio);
cell_release_singleton(cell2, bio); dm_cell_release_singleton(cell2, bio);
if ((!lookup_result.shared) && pool->pf.discard_passdown) if ((!lookup_result.shared) && pool->pf.discard_passdown)
remap_and_issue(tc, bio, lookup_result.block); remap_and_issue(tc, bio, lookup_result.block);
else else
@ -1351,20 +1378,20 @@ static void process_discard(struct thin_c *tc, struct bio *bio)
/* /*
* It isn't provisioned, just forget it. * It isn't provisioned, just forget it.
*/ */
cell_release_singleton(cell, bio); dm_cell_release_singleton(cell, bio);
bio_endio(bio, 0); bio_endio(bio, 0);
break; break;
default: default:
DMERR("discard: find block unexpectedly returned %d", r); DMERR("discard: find block unexpectedly returned %d", r);
cell_release_singleton(cell, bio); dm_cell_release_singleton(cell, bio);
bio_io_error(bio); bio_io_error(bio);
break; break;
} }
} }
static void break_sharing(struct thin_c *tc, struct bio *bio, dm_block_t block, static void break_sharing(struct thin_c *tc, struct bio *bio, dm_block_t block,
struct cell_key *key, struct dm_cell_key *key,
struct dm_thin_lookup_result *lookup_result, struct dm_thin_lookup_result *lookup_result,
struct dm_bio_prison_cell *cell) struct dm_bio_prison_cell *cell)
{ {
@ -1384,7 +1411,7 @@ static void break_sharing(struct thin_c *tc, struct bio *bio, dm_block_t block,
default: default:
DMERR("%s: alloc_data_block() failed, error = %d", __func__, r); DMERR("%s: alloc_data_block() failed, error = %d", __func__, r);
cell_error(cell); dm_cell_error(cell);
break; break;
} }
} }
@ -1395,14 +1422,14 @@ static void process_shared_bio(struct thin_c *tc, struct bio *bio,
{ {
struct dm_bio_prison_cell *cell; struct dm_bio_prison_cell *cell;
struct pool *pool = tc->pool; struct pool *pool = tc->pool;
struct cell_key key; struct dm_cell_key key;
/* /*
* If cell is already occupied, then sharing is already in the process * If cell is already occupied, then sharing is already in the process
* of being broken so we have nothing further to do here. * of being broken so we have nothing further to do here.
*/ */
build_data_key(tc->td, lookup_result->block, &key); build_data_key(tc->td, lookup_result->block, &key);
if (bio_detain(pool->prison, &key, bio, &cell)) if (dm_bio_detain(pool->prison, &key, bio, &cell))
return; return;
if (bio_data_dir(bio) == WRITE && bio->bi_size) if (bio_data_dir(bio) == WRITE && bio->bi_size)
@ -1410,9 +1437,9 @@ static void process_shared_bio(struct thin_c *tc, struct bio *bio,
else { else {
struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr; struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr;
h->shared_read_entry = ds_inc(&pool->shared_read_ds); h->shared_read_entry = dm_deferred_entry_inc(pool->shared_read_ds);
cell_release_singleton(cell, bio); dm_cell_release_singleton(cell, bio);
remap_and_issue(tc, bio, lookup_result->block); remap_and_issue(tc, bio, lookup_result->block);
} }
} }
@ -1427,7 +1454,7 @@ static void provision_block(struct thin_c *tc, struct bio *bio, dm_block_t block
* Remap empty bios (flushes) immediately, without provisioning. * Remap empty bios (flushes) immediately, without provisioning.
*/ */
if (!bio->bi_size) { if (!bio->bi_size) {
cell_release_singleton(cell, bio); dm_cell_release_singleton(cell, bio);
remap_and_issue(tc, bio, 0); remap_and_issue(tc, bio, 0);
return; return;
} }
@ -1437,7 +1464,7 @@ static void provision_block(struct thin_c *tc, struct bio *bio, dm_block_t block
*/ */
if (bio_data_dir(bio) == READ) { if (bio_data_dir(bio) == READ) {
zero_fill_bio(bio); zero_fill_bio(bio);
cell_release_singleton(cell, bio); dm_cell_release_singleton(cell, bio);
bio_endio(bio, 0); bio_endio(bio, 0);
return; return;
} }
@ -1458,7 +1485,7 @@ static void provision_block(struct thin_c *tc, struct bio *bio, dm_block_t block
default: default:
DMERR("%s: alloc_data_block() failed, error = %d", __func__, r); DMERR("%s: alloc_data_block() failed, error = %d", __func__, r);
set_pool_mode(tc->pool, PM_READ_ONLY); set_pool_mode(tc->pool, PM_READ_ONLY);
cell_error(cell); dm_cell_error(cell);
break; break;
} }
} }
@ -1468,7 +1495,7 @@ static void process_bio(struct thin_c *tc, struct bio *bio)
int r; int r;
dm_block_t block = get_bio_block(tc, bio); dm_block_t block = get_bio_block(tc, bio);
struct dm_bio_prison_cell *cell; struct dm_bio_prison_cell *cell;
struct cell_key key; struct dm_cell_key key;
struct dm_thin_lookup_result lookup_result; struct dm_thin_lookup_result lookup_result;
/* /*
@ -1476,7 +1503,7 @@ static void process_bio(struct thin_c *tc, struct bio *bio)
* being provisioned so we have nothing further to do here. * being provisioned so we have nothing further to do here.
*/ */
build_virtual_key(tc->td, block, &key); build_virtual_key(tc->td, block, &key);
if (bio_detain(tc->pool->prison, &key, bio, &cell)) if (dm_bio_detain(tc->pool->prison, &key, bio, &cell))
return; return;
r = dm_thin_find_block(tc->td, block, 1, &lookup_result); r = dm_thin_find_block(tc->td, block, 1, &lookup_result);
@ -1491,7 +1518,7 @@ static void process_bio(struct thin_c *tc, struct bio *bio)
* TODO: this will probably have to change when discard goes * TODO: this will probably have to change when discard goes
* back in. * back in.
*/ */
cell_release_singleton(cell, bio); dm_cell_release_singleton(cell, bio);
if (lookup_result.shared) if (lookup_result.shared)
process_shared_bio(tc, bio, block, &lookup_result); process_shared_bio(tc, bio, block, &lookup_result);
@ -1501,7 +1528,7 @@ static void process_bio(struct thin_c *tc, struct bio *bio)
case -ENODATA: case -ENODATA:
if (bio_data_dir(bio) == READ && tc->origin_dev) { if (bio_data_dir(bio) == READ && tc->origin_dev) {
cell_release_singleton(cell, bio); dm_cell_release_singleton(cell, bio);
remap_to_origin_and_issue(tc, bio); remap_to_origin_and_issue(tc, bio);
} else } else
provision_block(tc, bio, block, cell); provision_block(tc, bio, block, cell);
@ -1509,7 +1536,7 @@ static void process_bio(struct thin_c *tc, struct bio *bio)
default: default:
DMERR("dm_thin_find_block() failed, error = %d", r); DMERR("dm_thin_find_block() failed, error = %d", r);
cell_release_singleton(cell, bio); dm_cell_release_singleton(cell, bio);
bio_io_error(bio); bio_io_error(bio);
break; break;
} }
@ -1718,7 +1745,7 @@ static struct dm_thin_endio_hook *thin_hook_bio(struct thin_c *tc, struct bio *b
h->tc = tc; h->tc = tc;
h->shared_read_entry = NULL; h->shared_read_entry = NULL;
h->all_io_entry = bio->bi_rw & REQ_DISCARD ? NULL : ds_inc(&pool->all_io_ds); h->all_io_entry = bio->bi_rw & REQ_DISCARD ? NULL : dm_deferred_entry_inc(pool->all_io_ds);
h->overwrite_mapping = NULL; h->overwrite_mapping = NULL;
return h; return h;
@ -1928,7 +1955,7 @@ static void __pool_destroy(struct pool *pool)
if (dm_pool_metadata_close(pool->pmd) < 0) if (dm_pool_metadata_close(pool->pmd) < 0)
DMWARN("%s: dm_pool_metadata_close() failed.", __func__); DMWARN("%s: dm_pool_metadata_close() failed.", __func__);
prison_destroy(pool->prison); dm_bio_prison_destroy(pool->prison);
dm_kcopyd_client_destroy(pool->copier); dm_kcopyd_client_destroy(pool->copier);
if (pool->wq) if (pool->wq)
@ -1938,6 +1965,8 @@ static void __pool_destroy(struct pool *pool)
mempool_free(pool->next_mapping, pool->mapping_pool); mempool_free(pool->next_mapping, pool->mapping_pool);
mempool_destroy(pool->mapping_pool); mempool_destroy(pool->mapping_pool);
mempool_destroy(pool->endio_hook_pool); mempool_destroy(pool->endio_hook_pool);
dm_deferred_set_destroy(pool->shared_read_ds);
dm_deferred_set_destroy(pool->all_io_ds);
kfree(pool); kfree(pool);
} }
@ -1976,7 +2005,7 @@ static struct pool *pool_create(struct mapped_device *pool_md,
pool->sectors_per_block_shift = __ffs(block_size); pool->sectors_per_block_shift = __ffs(block_size);
pool->low_water_blocks = 0; pool->low_water_blocks = 0;
pool_features_init(&pool->pf); pool_features_init(&pool->pf);
pool->prison = prison_create(PRISON_CELLS); pool->prison = dm_bio_prison_create(PRISON_CELLS);
if (!pool->prison) { if (!pool->prison) {
*error = "Error creating pool's bio prison"; *error = "Error creating pool's bio prison";
err_p = ERR_PTR(-ENOMEM); err_p = ERR_PTR(-ENOMEM);
@ -2012,8 +2041,20 @@ static struct pool *pool_create(struct mapped_device *pool_md,
pool->low_water_triggered = 0; pool->low_water_triggered = 0;
pool->no_free_space = 0; pool->no_free_space = 0;
bio_list_init(&pool->retry_on_resume_list); bio_list_init(&pool->retry_on_resume_list);
ds_init(&pool->shared_read_ds);
ds_init(&pool->all_io_ds); pool->shared_read_ds = dm_deferred_set_create();
if (!pool->shared_read_ds) {
*error = "Error creating pool's shared read deferred set";
err_p = ERR_PTR(-ENOMEM);
goto bad_shared_read_ds;
}
pool->all_io_ds = dm_deferred_set_create();
if (!pool->all_io_ds) {
*error = "Error creating pool's all io deferred set";
err_p = ERR_PTR(-ENOMEM);
goto bad_all_io_ds;
}
pool->next_mapping = NULL; pool->next_mapping = NULL;
pool->mapping_pool = mempool_create_slab_pool(MAPPING_POOL_SIZE, pool->mapping_pool = mempool_create_slab_pool(MAPPING_POOL_SIZE,
@ -2042,11 +2083,15 @@ static struct pool *pool_create(struct mapped_device *pool_md,
bad_endio_hook_pool: bad_endio_hook_pool:
mempool_destroy(pool->mapping_pool); mempool_destroy(pool->mapping_pool);
bad_mapping_pool: bad_mapping_pool:
dm_deferred_set_destroy(pool->all_io_ds);
bad_all_io_ds:
dm_deferred_set_destroy(pool->shared_read_ds);
bad_shared_read_ds:
destroy_workqueue(pool->wq); destroy_workqueue(pool->wq);
bad_wq: bad_wq:
dm_kcopyd_client_destroy(pool->copier); dm_kcopyd_client_destroy(pool->copier);
bad_kcopyd_client: bad_kcopyd_client:
prison_destroy(pool->prison); dm_bio_prison_destroy(pool->prison);
bad_prison: bad_prison:
kfree(pool); kfree(pool);
bad_pool: bad_pool:
@ -2982,7 +3027,7 @@ static int thin_endio(struct dm_target *ti,
if (h->shared_read_entry) { if (h->shared_read_entry) {
INIT_LIST_HEAD(&work); INIT_LIST_HEAD(&work);
ds_dec(h->shared_read_entry, &work); dm_deferred_entry_dec(h->shared_read_entry, &work);
spin_lock_irqsave(&pool->lock, flags); spin_lock_irqsave(&pool->lock, flags);
list_for_each_entry_safe(m, tmp, &work, list) { list_for_each_entry_safe(m, tmp, &work, list) {
@ -2995,7 +3040,7 @@ static int thin_endio(struct dm_target *ti,
if (h->all_io_entry) { if (h->all_io_entry) {
INIT_LIST_HEAD(&work); INIT_LIST_HEAD(&work);
ds_dec(h->all_io_entry, &work); dm_deferred_entry_dec(h->all_io_entry, &work);
spin_lock_irqsave(&pool->lock, flags); spin_lock_irqsave(&pool->lock, flags);
list_for_each_entry_safe(m, tmp, &work, list) list_for_each_entry_safe(m, tmp, &work, list)
list_add(&m->list, &pool->prepared_discards); list_add(&m->list, &pool->prepared_discards);
@ -3128,9 +3173,7 @@ static int __init dm_thin_init(void)
r = -ENOMEM; r = -ENOMEM;
_cell_cache = KMEM_CACHE(dm_bio_prison_cell, 0); dm_bio_prison_init();
if (!_cell_cache)
goto bad_cell_cache;
_new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, 0); _new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, 0);
if (!_new_mapping_cache) if (!_new_mapping_cache)
@ -3145,8 +3188,6 @@ static int __init dm_thin_init(void)
bad_endio_hook_cache: bad_endio_hook_cache:
kmem_cache_destroy(_new_mapping_cache); kmem_cache_destroy(_new_mapping_cache);
bad_new_mapping_cache: bad_new_mapping_cache:
kmem_cache_destroy(_cell_cache);
bad_cell_cache:
dm_unregister_target(&pool_target); dm_unregister_target(&pool_target);
bad_pool_target: bad_pool_target:
dm_unregister_target(&thin_target); dm_unregister_target(&thin_target);
@ -3159,7 +3200,7 @@ static void dm_thin_exit(void)
dm_unregister_target(&thin_target); dm_unregister_target(&thin_target);
dm_unregister_target(&pool_target); dm_unregister_target(&pool_target);
kmem_cache_destroy(_cell_cache); dm_bio_prison_exit();
kmem_cache_destroy(_new_mapping_cache); kmem_cache_destroy(_new_mapping_cache);
kmem_cache_destroy(_endio_hook_cache); kmem_cache_destroy(_endio_hook_cache);
} }