diff options
| -rw-r--r-- | drivers/md/dm-table.c | 11 | ||||
| -rw-r--r-- | drivers/md/dm.c | 33 | ||||
| -rw-r--r-- | drivers/md/dm.h | 2 | ||||
| -rw-r--r-- | include/linux/device-mapper.h | 30 |
4 files changed, 56 insertions, 20 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 6be58b696377..daf25d0890b3 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -967,13 +967,22 @@ bool dm_table_request_based(struct dm_table *t) int dm_table_alloc_md_mempools(struct dm_table *t) { unsigned type = dm_table_get_type(t); + unsigned per_bio_data_size = 0; + struct dm_target *tgt; + unsigned i; if (unlikely(type == DM_TYPE_NONE)) { DMWARN("no table type is set, can't allocate mempools"); return -EINVAL; } - t->mempools = dm_alloc_md_mempools(type, t->integrity_supported); + if (type == DM_TYPE_BIO_BASED) + for (i = 0; i < t->num_targets; i++) { + tgt = t->targets + i; + per_bio_data_size = max(per_bio_data_size, tgt->per_bio_data_size); + } + + t->mempools = dm_alloc_md_mempools(type, t->integrity_supported, per_bio_data_size); if (!t->mempools) return -ENOMEM; diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 5401cdce0fc5..2765cf2ba0ff 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -63,18 +63,6 @@ struct dm_io { }; /* - * For bio-based dm. - * One of these is allocated per target within a bio. Hopefully - * this will be simplified out one day. - */ -struct dm_target_io { - struct dm_io *io; - struct dm_target *ti; - union map_info info; - struct bio clone; -}; - -/* * For request-based dm. * One of these is allocated per request. */ @@ -1980,13 +1968,20 @@ static void free_dev(struct mapped_device *md) static void __bind_mempools(struct mapped_device *md, struct dm_table *t) { - struct dm_md_mempools *p; + struct dm_md_mempools *p = dm_table_get_md_mempools(t); - if (md->io_pool && (md->tio_pool || dm_table_get_type(t) == DM_TYPE_BIO_BASED) && md->bs) - /* the md already has necessary mempools */ + if (md->io_pool && (md->tio_pool || dm_table_get_type(t) == DM_TYPE_BIO_BASED) && md->bs) { + /* + * The md already has necessary mempools. Reload just the + * bioset because front_pad may have changed because + * a different table was loaded. + */ + bioset_free(md->bs); + md->bs = p->bs; + p->bs = NULL; goto out; + } - p = dm_table_get_md_mempools(t); BUG_ON(!p || md->io_pool || md->tio_pool || md->bs); md->io_pool = p->io_pool; @@ -2745,7 +2740,7 @@ int dm_noflush_suspending(struct dm_target *ti) } EXPORT_SYMBOL_GPL(dm_noflush_suspending); -struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity) +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; @@ -2753,6 +2748,8 @@ struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity) if (!pools) return NULL; + per_bio_data_size = roundup(per_bio_data_size, __alignof__(struct dm_target_io)); + pools->io_pool = (type == DM_TYPE_BIO_BASED) ? mempool_create_slab_pool(MIN_IOS, _io_cache) : mempool_create_slab_pool(MIN_IOS, _rq_bio_info_cache); @@ -2768,7 +2765,7 @@ struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity) pools->bs = (type == DM_TYPE_BIO_BASED) ? bioset_create(pool_size, - offsetof(struct dm_target_io, clone)) : + per_bio_data_size + offsetof(struct dm_target_io, clone)) : bioset_create(pool_size, offsetof(struct dm_rq_clone_bio_info, clone)); if (!pools->bs) diff --git a/drivers/md/dm.h b/drivers/md/dm.h index 6a99fefaa743..45b97da1bd06 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -159,7 +159,7 @@ void dm_kcopyd_exit(void); /* * Mempool operations */ -struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity); +struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, unsigned per_bio_data_size); void dm_free_md_mempools(struct dm_md_mempools *pools); #endif diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index d1f6cd8486f2..6f0e73b4a80d 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -210,6 +210,12 @@ struct dm_target { */ unsigned num_write_same_requests; + /* + * The minimum number of extra bytes allocated in each bio for the + * target to use. dm_per_bio_data returns the data location. + */ + unsigned per_bio_data_size; + /* target specific data */ void *private; @@ -246,6 +252,30 @@ struct dm_target_callbacks { int (*congested_fn) (struct dm_target_callbacks *, int); }; +/* + * For bio-based dm. + * One of these is allocated for each bio. + * This structure shouldn't be touched directly by target drivers. + * It is here so that we can inline dm_per_bio_data and + * dm_bio_from_per_bio_data + */ +struct dm_target_io { + struct dm_io *io; + struct dm_target *ti; + union map_info info; + struct bio clone; +}; + +static inline void *dm_per_bio_data(struct bio *bio, size_t data_size) +{ + return (char *)bio - offsetof(struct dm_target_io, clone) - data_size; +} + +static inline struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size) +{ + return (struct bio *)((char *)data + data_size + offsetof(struct dm_target_io, clone)); +} + int dm_register_target(struct target_type *t); void dm_unregister_target(struct target_type *t); |