#define PRISON_CELLS 1024
#define COMMIT_PERIOD HZ
+DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(snapshot_copy_throttle,
+ "A percentage of time allocated for copy on write");
+
/*
* The block size of the device holding pool data must be
* between 64KB and 1GB.
/*----------------------------------------------------------------*/
+/*
+ * wake_worker() is used when new work is queued and when pool_resume is
+ * ready to continue deferred IO processing.
+ */
+static void wake_worker(struct pool *pool)
+{
+ queue_work(pool->wq, &pool->worker);
+}
+
+/*----------------------------------------------------------------*/
+
+static int bio_detain(struct pool *pool, struct dm_cell_key *key, struct bio *bio,
+ struct dm_bio_prison_cell **cell_result)
+{
+ int r;
+ struct dm_bio_prison_cell *cell_prealloc;
+
+ /*
+ * Allocate a cell from the prison's mempool.
+ * This might block but it can't fail.
+ */
+ cell_prealloc = dm_bio_prison_alloc_cell(pool->prison, GFP_NOIO);
+
+ r = dm_bio_detain(pool->prison, key, bio, cell_prealloc, cell_result);
+ if (r)
+ /*
+ * We reused an old cell; we can get rid of
+ * the new one.
+ */
+ dm_bio_prison_free_cell(pool->prison, cell_prealloc);
+
+ return r;
+}
+
+static void cell_release(struct pool *pool,
+ struct dm_bio_prison_cell *cell,
+ struct bio_list *bios)
+{
+ dm_cell_release(pool->prison, cell, bios);
+ dm_bio_prison_free_cell(pool->prison, cell);
+}
+
+static void cell_release_no_holder(struct pool *pool,
+ struct dm_bio_prison_cell *cell,
+ struct bio_list *bios)
+{
+ dm_cell_release_no_holder(pool->prison, cell, bios);
+ dm_bio_prison_free_cell(pool->prison, cell);
+}
+
+static void cell_defer_no_holder_no_free(struct thin_c *tc,
+ struct dm_bio_prison_cell *cell)
+{
+ struct pool *pool = tc->pool;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pool->lock, flags);
+ dm_cell_release_no_holder(pool->prison, cell, &pool->deferred_bios);
+ spin_unlock_irqrestore(&pool->lock, flags);
+
+ wake_worker(pool);
+}
+
+static void cell_error(struct pool *pool,
+ struct dm_bio_prison_cell *cell)
+{
+ dm_cell_error(pool->prison, cell);
+ dm_bio_prison_free_cell(pool->prison, cell);
+}
+
+/*----------------------------------------------------------------*/
+
/*
* A global list of pools that uses a struct mapped_device as a key.
*/
issue(tc, bio);
}
-/*
- * wake_worker() is used when new work is queued and when pool_resume is
- * ready to continue deferred IO processing.
- */
-static void wake_worker(struct pool *pool)
-{
- queue_work(pool->wq, &pool->worker);
-}
-
/*----------------------------------------------------------------*/
/*
unsigned long flags;
spin_lock_irqsave(&pool->lock, flags);
- dm_cell_release(cell, &pool->deferred_bios);
+ cell_release(pool, cell, &pool->deferred_bios);
spin_unlock_irqrestore(&tc->pool->lock, flags);
wake_worker(pool);
}
/*
- * Same as cell_defer except it omits the original holder of the cell.
+ * Same as cell_defer above, except it omits the original holder of the cell.
*/
static void cell_defer_no_holder(struct thin_c *tc, struct dm_bio_prison_cell *cell)
{
unsigned long flags;
spin_lock_irqsave(&pool->lock, flags);
- dm_cell_release_no_holder(cell, &pool->deferred_bios);
+ cell_release_no_holder(pool, cell, &pool->deferred_bios);
spin_unlock_irqrestore(&pool->lock, flags);
wake_worker(pool);
{
if (m->bio)
m->bio->bi_end_io = m->saved_bi_end_io;
- dm_cell_error(m->cell);
+ cell_error(m->tc->pool, m->cell);
list_del(&m->list);
mempool_free(m, m->tc->pool->mapping_pool);
}
+
static void process_prepared_mapping(struct dm_thin_new_mapping *m)
{
struct thin_c *tc = m->tc;
+ struct pool *pool = tc->pool;
struct bio *bio;
int r;
bio->bi_end_io = m->saved_bi_end_io;
if (m->err) {
- dm_cell_error(m->cell);
+ cell_error(pool, m->cell);
goto out;
}
r = dm_thin_insert_block(tc->td, m->virt_block, m->data_block);
if (r) {
DMERR_LIMIT("dm_thin_insert_block() failed");
- dm_cell_error(m->cell);
+ cell_error(pool, m->cell);
goto out;
}
out:
list_del(&m->list);
- mempool_free(m, tc->pool->mapping_pool);
+ mempool_free(m, pool->mapping_pool);
}
static void process_prepared_discard_fail(struct dm_thin_new_mapping *m)
if (r < 0) {
mempool_free(m, pool->mapping_pool);
DMERR_LIMIT("dm_kcopyd_copy() failed");
- dm_cell_error(cell);
+ cell_error(pool, cell);
}
}
}
if (r < 0) {
mempool_free(m, pool->mapping_pool);
DMERR_LIMIT("dm_kcopyd_zero() failed");
- dm_cell_error(cell);
+ cell_error(pool, cell);
}
}
}
spin_unlock_irqrestore(&pool->lock, flags);
}
-static void no_space(struct dm_bio_prison_cell *cell)
+static void no_space(struct pool *pool, struct dm_bio_prison_cell *cell)
{
struct bio *bio;
struct bio_list bios;
bio_list_init(&bios);
- dm_cell_release(cell, &bios);
+ cell_release(pool, cell, &bios);
while ((bio = bio_list_pop(&bios)))
retry_on_resume(bio);
struct dm_thin_new_mapping *m;
build_virtual_key(tc->td, block, &key);
- if (dm_bio_detain(tc->pool->prison, &key, bio, &cell))
+ if (bio_detain(tc->pool, &key, bio, &cell))
return;
r = dm_thin_find_block(tc->td, block, 1, &lookup_result);
* on this block.
*/
build_data_key(tc->td, lookup_result.block, &key2);
- if (dm_bio_detain(tc->pool->prison, &key2, bio, &cell2)) {
+ if (bio_detain(tc->pool, &key2, bio, &cell2)) {
cell_defer_no_holder(tc, cell);
break;
}
break;
case -ENOSPC:
- no_space(cell);
+ no_space(tc->pool, cell);
break;
default:
DMERR_LIMIT("%s: alloc_data_block() failed: error = %d",
__func__, r);
- dm_cell_error(cell);
+ cell_error(tc->pool, cell);
break;
}
}
* of being broken so we have nothing further to do here.
*/
build_data_key(tc->td, lookup_result->block, &key);
- if (dm_bio_detain(pool->prison, &key, bio, &cell))
+ if (bio_detain(pool, &key, bio, &cell))
return;
if (bio_data_dir(bio) == WRITE && bio->bi_size)
{
int r;
dm_block_t data_block;
+ struct pool *pool = tc->pool;
/*
* Remap empty bios (flushes) immediately, without provisioning.
*/
if (!bio->bi_size) {
- inc_all_io_entry(tc->pool, bio);
+ inc_all_io_entry(pool, bio);
cell_defer_no_holder(tc, cell);
remap_and_issue(tc, bio, 0);
break;
case -ENOSPC:
- no_space(cell);
+ no_space(pool, cell);
break;
default:
DMERR_LIMIT("%s: alloc_data_block() failed: error = %d",
__func__, r);
- set_pool_mode(tc->pool, PM_READ_ONLY);
- dm_cell_error(cell);
+ set_pool_mode(pool, PM_READ_ONLY);
+ cell_error(pool, cell);
break;
}
}
static void process_bio(struct thin_c *tc, struct bio *bio)
{
int r;
+ struct pool *pool = tc->pool;
dm_block_t block = get_bio_block(tc, bio);
struct dm_bio_prison_cell *cell;
struct dm_cell_key key;
* being provisioned so we have nothing further to do here.
*/
build_virtual_key(tc->td, block, &key);
- if (dm_bio_detain(tc->pool->prison, &key, bio, &cell))
+ if (bio_detain(pool, &key, bio, &cell))
return;
r = dm_thin_find_block(tc->td, block, 1, &lookup_result);
case 0:
if (lookup_result.shared) {
process_shared_bio(tc, bio, block, &lookup_result);
- cell_defer_no_holder(tc, cell);
+ cell_defer_no_holder(tc, cell); /* FIXME: pass this cell into process_shared? */
} else {
- inc_all_io_entry(tc->pool, bio);
+ inc_all_io_entry(pool, bio);
cell_defer_no_holder(tc, cell);
remap_and_issue(tc, bio, lookup_result.block);
case -ENODATA:
if (bio_data_dir(bio) == READ && tc->origin_dev) {
- inc_all_io_entry(tc->pool, bio);
+ inc_all_io_entry(pool, bio);
cell_defer_no_holder(tc, cell);
remap_to_origin_and_issue(tc, bio);
dm_block_t block = get_bio_block(tc, bio);
struct dm_thin_device *td = tc->td;
struct dm_thin_lookup_result result;
- struct dm_bio_prison_cell *cell1, *cell2;
+ struct dm_bio_prison_cell cell1, cell2;
+ struct dm_bio_prison_cell *cell_result;
struct dm_cell_key key;
thin_hook_bio(tc, bio);
}
build_virtual_key(tc->td, block, &key);
- if (dm_bio_detain(tc->pool->prison, &key, bio, &cell1))
+ if (dm_bio_detain(tc->pool->prison, &key, bio, &cell1, &cell_result))
return DM_MAPIO_SUBMITTED;
build_data_key(tc->td, result.block, &key);
- if (dm_bio_detain(tc->pool->prison, &key, bio, &cell2)) {
- cell_defer_no_holder(tc, cell1);
+ if (dm_bio_detain(tc->pool->prison, &key, bio, &cell2, &cell_result)) {
+ cell_defer_no_holder_no_free(tc, &cell1);
return DM_MAPIO_SUBMITTED;
}
inc_all_io_entry(tc->pool, bio);
- cell_defer_no_holder(tc, cell2);
- cell_defer_no_holder(tc, cell1);
+ cell_defer_no_holder_no_free(tc, &cell2);
+ cell_defer_no_holder_no_free(tc, &cell1);
remap(tc, bio, result.block);
return DM_MAPIO_REMAPPED;
goto bad_prison;
}
- pool->copier = dm_kcopyd_client_create();
+ pool->copier = dm_kcopyd_client_create(&dm_kcopyd_throttle);
if (IS_ERR(pool->copier)) {
r = PTR_ERR(pool->copier);
*error = "Error creating pool's kcopyd client";
projects / cascardo / linux.git / blobdiff