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authorJun'ichi Nomura <j-nomura@ce.jp.nec.com>2013-03-01 22:45:48 +0000
committerAlasdair G Kergon <agk@redhat.com>2013-03-01 22:45:48 +0000
commit5f01520415e82f8e354807484ef842335070a3bd (patch)
tree0100b4309d01d22bd3726b20d76b5cd56c64df5e /drivers/md/dm.c
parent23e5083b4d47e778bf7983329989dab7543def14 (diff)
dm: merge io_pool and tio_pool
This patch merges io_pool and tio_pool into io_pool and cleans up related functions. Though device-mapper used to have 2 pools of objects for each dm device, the use of bioset frontbad for per-bio data has shrunk the number of pools to 1 for both bio-based and request-based device types. (See c0820cf5 "dm: introduce per_bio_data" and 94818742 "dm: Use bioset's front_pad for dm_rq_clone_bio_info") So dm no longer has to maintain 2 different pointers. No functional changes. Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c76
1 files changed, 27 insertions, 49 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 031f1f1c711b..e417cf0a69ef 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -163,7 +163,6 @@ struct mapped_device {
* io objects are allocated from here.
*/
mempool_t *io_pool;
- mempool_t *tio_pool;
struct bio_set *bs;
@@ -197,7 +196,6 @@ struct mapped_device {
*/
struct dm_md_mempools {
mempool_t *io_pool;
- mempool_t *tio_pool;
struct bio_set *bs;
};
@@ -435,12 +433,12 @@ static void free_tio(struct mapped_device *md, struct dm_target_io *tio)
static struct dm_rq_target_io *alloc_rq_tio(struct mapped_device *md,
gfp_t gfp_mask)
{
- return mempool_alloc(md->tio_pool, gfp_mask);
+ return mempool_alloc(md->io_pool, gfp_mask);
}
static void free_rq_tio(struct dm_rq_target_io *tio)
{
- mempool_free(tio, tio->md->tio_pool);
+ mempool_free(tio, tio->md->io_pool);
}
static int md_in_flight(struct mapped_device *md)
@@ -1949,8 +1947,6 @@ static void free_dev(struct mapped_device *md)
unlock_fs(md);
bdput(md->bdev);
destroy_workqueue(md->wq);
- if (md->tio_pool)
- mempool_destroy(md->tio_pool);
if (md->io_pool)
mempool_destroy(md->io_pool);
if (md->bs)
@@ -1973,7 +1969,7 @@ static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
{
struct dm_md_mempools *p = dm_table_get_md_mempools(t);
- if (md->bs) {
+ if (md->io_pool && md->bs) {
/* The md already has necessary mempools. */
if (dm_table_get_type(t) == DM_TYPE_BIO_BASED) {
/*
@@ -1984,7 +1980,6 @@ static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
md->bs = p->bs;
p->bs = NULL;
} else if (dm_table_get_type(t) == DM_TYPE_REQUEST_BASED) {
- BUG_ON(!md->tio_pool);
/*
* There's no need to reload with request-based dm
* because the size of front_pad doesn't change.
@@ -1997,12 +1992,10 @@ static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
goto out;
}
- BUG_ON(!p || md->io_pool || md->tio_pool || md->bs);
+ BUG_ON(!p || md->io_pool || md->bs);
md->io_pool = p->io_pool;
p->io_pool = NULL;
- md->tio_pool = p->tio_pool;
- p->tio_pool = NULL;
md->bs = p->bs;
p->bs = NULL;
@@ -2759,54 +2752,42 @@ EXPORT_SYMBOL_GPL(dm_noflush_suspending);
struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, unsigned per_bio_data_size)
{
- struct dm_md_mempools *pools = kmalloc(sizeof(*pools), GFP_KERNEL);
- unsigned int pool_size = (type == DM_TYPE_BIO_BASED) ? 16 : MIN_IOS;
+ struct dm_md_mempools *pools = kzalloc(sizeof(*pools), GFP_KERNEL);
+ struct kmem_cache *cachep;
+ unsigned int pool_size;
+ unsigned int front_pad;
if (!pools)
return NULL;
- per_bio_data_size = roundup(per_bio_data_size, __alignof__(struct dm_target_io));
-
- pools->io_pool = NULL;
if (type == DM_TYPE_BIO_BASED) {
- pools->io_pool = mempool_create_slab_pool(MIN_IOS, _io_cache);
- if (!pools->io_pool)
- goto free_pools_and_out;
- }
+ cachep = _io_cache;
+ pool_size = 16;
+ front_pad = roundup(per_bio_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone);
+ } else if (type == DM_TYPE_REQUEST_BASED) {
+ cachep = _rq_tio_cache;
+ pool_size = MIN_IOS;
+ front_pad = offsetof(struct dm_rq_clone_bio_info, clone);
+ /* per_bio_data_size is not used. See __bind_mempools(). */
+ WARN_ON(per_bio_data_size != 0);
+ } else
+ goto out;
- pools->tio_pool = NULL;
- if (type == DM_TYPE_REQUEST_BASED) {
- pools->tio_pool = mempool_create_slab_pool(MIN_IOS, _rq_tio_cache);
- if (!pools->tio_pool)
- goto free_io_pool_and_out;
- }
+ pools->io_pool = mempool_create_slab_pool(MIN_IOS, cachep);
+ if (!pools->io_pool)
+ goto out;
- pools->bs = (type == DM_TYPE_BIO_BASED) ?
- bioset_create(pool_size,
- per_bio_data_size + offsetof(struct dm_target_io, clone)) :
- bioset_create(pool_size,
- offsetof(struct dm_rq_clone_bio_info, clone));
+ pools->bs = bioset_create(pool_size, front_pad);
if (!pools->bs)
- goto free_tio_pool_and_out;
+ goto out;
if (integrity && bioset_integrity_create(pools->bs, pool_size))
- goto free_bioset_and_out;
+ goto out;
return pools;
-free_bioset_and_out:
- bioset_free(pools->bs);
-
-free_tio_pool_and_out:
- if (pools->tio_pool)
- mempool_destroy(pools->tio_pool);
-
-free_io_pool_and_out:
- if (pools->io_pool)
- mempool_destroy(pools->io_pool);
-
-free_pools_and_out:
- kfree(pools);
+out:
+ dm_free_md_mempools(pools);
return NULL;
}
@@ -2819,9 +2800,6 @@ void dm_free_md_mempools(struct dm_md_mempools *pools)
if (pools->io_pool)
mempool_destroy(pools->io_pool);
- if (pools->tio_pool)
- mempool_destroy(pools->tio_pool);
-
if (pools->bs)
bioset_free(pools->bs);