diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/dm-thin.c | 84 |
1 files changed, 59 insertions, 25 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c index 25dfd2311a61..41c9e81ba74a 100644 --- a/drivers/md/dm-thin.c +++ b/drivers/md/dm-thin.c @@ -368,6 +368,17 @@ static int bio_triggers_commit(struct thin_c *tc, struct bio *bio) dm_thin_changed_this_transaction(tc->td); } +static void inc_all_io_entry(struct pool *pool, struct bio *bio) +{ + struct dm_thin_endio_hook *h; + + if (bio->bi_rw & REQ_DISCARD) + return; + + h = dm_get_mapinfo(bio)->ptr; + h->all_io_entry = dm_deferred_entry_inc(pool->all_io_ds); +} + static void issue(struct thin_c *tc, struct bio *bio) { struct pool *pool = tc->pool; @@ -596,13 +607,15 @@ static void process_prepared_discard_passdown(struct dm_thin_new_mapping *m) { struct thin_c *tc = m->tc; + inc_all_io_entry(tc->pool, m->bio); + cell_defer_except(tc, m->cell); + cell_defer_except(tc, m->cell2); + if (m->pass_discard) remap_and_issue(tc, m->bio, m->data_block); else bio_endio(m->bio, 0); - cell_defer_except(tc, m->cell); - cell_defer_except(tc, m->cell2); mempool_free(m, tc->pool->mapping_pool); } @@ -710,6 +723,7 @@ static void schedule_copy(struct thin_c *tc, dm_block_t virt_block, h->overwrite_mapping = m; m->bio = bio; save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio); + inc_all_io_entry(pool, bio); remap_and_issue(tc, bio, data_dest); } else { struct dm_io_region from, to; @@ -779,6 +793,7 @@ static void schedule_zero(struct thin_c *tc, dm_block_t virt_block, h->overwrite_mapping = m; m->bio = bio; save_and_set_endio(bio, &m->saved_bi_end_io, overwrite_endio); + inc_all_io_entry(pool, bio); remap_and_issue(tc, bio, data_block); } else { int r; @@ -961,13 +976,15 @@ static void process_discard(struct thin_c *tc, struct bio *bio) wake_worker(pool); } } else { + inc_all_io_entry(pool, bio); + cell_defer_except(tc, cell); + cell_defer_except(tc, cell2); + /* * The DM core makes sure that the discard doesn't span * a block boundary. So we submit the discard of a * partial block appropriately. */ - cell_defer_except(tc, cell); - cell_defer_except(tc, cell2); if ((!lookup_result.shared) && pool->pf.discard_passdown) remap_and_issue(tc, bio, lookup_result.block); else @@ -1039,8 +1056,9 @@ static void process_shared_bio(struct thin_c *tc, struct bio *bio, struct dm_thin_endio_hook *h = dm_get_mapinfo(bio)->ptr; h->shared_read_entry = dm_deferred_entry_inc(pool->shared_read_ds); - + inc_all_io_entry(pool, bio); cell_defer_except(tc, cell); + remap_and_issue(tc, bio, lookup_result->block); } } @@ -1055,7 +1073,9 @@ static void provision_block(struct thin_c *tc, struct bio *bio, dm_block_t block * Remap empty bios (flushes) immediately, without provisioning. */ if (!bio->bi_size) { + inc_all_io_entry(tc->pool, bio); cell_defer_except(tc, cell); + remap_and_issue(tc, bio, 0); return; } @@ -1110,26 +1130,22 @@ static void process_bio(struct thin_c *tc, struct bio *bio) r = dm_thin_find_block(tc->td, block, 1, &lookup_result); switch (r) { case 0: - /* - * We can release this cell now. This thread is the only - * one that puts bios into a cell, and we know there were - * no preceding bios. - */ - /* - * TODO: this will probably have to change when discard goes - * back in. - */ - cell_defer_except(tc, cell); - - if (lookup_result.shared) + if (lookup_result.shared) { process_shared_bio(tc, bio, block, &lookup_result); - else + cell_defer_except(tc, cell); + } else { + inc_all_io_entry(tc->pool, bio); + cell_defer_except(tc, cell); + remap_and_issue(tc, bio, lookup_result.block); + } break; case -ENODATA: if (bio_data_dir(bio) == READ && tc->origin_dev) { + inc_all_io_entry(tc->pool, bio); cell_defer_except(tc, cell); + remap_to_origin_and_issue(tc, bio); } else provision_block(tc, bio, block, cell); @@ -1155,8 +1171,10 @@ static void process_bio_read_only(struct thin_c *tc, struct bio *bio) case 0: if (lookup_result.shared && (rw == WRITE) && bio->bi_size) bio_io_error(bio); - else + else { + inc_all_io_entry(tc->pool, bio); remap_and_issue(tc, bio, lookup_result.block); + } break; case -ENODATA: @@ -1166,6 +1184,7 @@ static void process_bio_read_only(struct thin_c *tc, struct bio *bio) } if (tc->origin_dev) { + inc_all_io_entry(tc->pool, bio); remap_to_origin_and_issue(tc, bio); break; } @@ -1346,7 +1365,7 @@ static struct dm_thin_endio_hook *thin_hook_bio(struct thin_c *tc, struct bio *b h->tc = tc; h->shared_read_entry = NULL; - h->all_io_entry = bio->bi_rw & REQ_DISCARD ? NULL : dm_deferred_entry_inc(pool->all_io_ds); + h->all_io_entry = NULL; h->overwrite_mapping = NULL; return h; @@ -1363,6 +1382,8 @@ static int thin_bio_map(struct dm_target *ti, struct bio *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_cell_key key; map_context->ptr = thin_hook_bio(tc, bio); @@ -1399,12 +1420,25 @@ static int thin_bio_map(struct dm_target *ti, struct bio *bio, * shared flag will be set in their case. */ thin_defer_bio(tc, bio); - r = DM_MAPIO_SUBMITTED; - } else { - remap(tc, bio, result.block); - r = DM_MAPIO_REMAPPED; + return DM_MAPIO_SUBMITTED; } - break; + + build_virtual_key(tc->td, block, &key); + if (dm_bio_detain(tc->pool->prison, &key, bio, &cell1)) + return DM_MAPIO_SUBMITTED; + + build_data_key(tc->td, result.block, &key); + if (dm_bio_detain(tc->pool->prison, &key, bio, &cell2)) { + cell_defer_except(tc, cell1); + return DM_MAPIO_SUBMITTED; + } + + inc_all_io_entry(tc->pool, bio); + cell_defer_except(tc, cell2); + cell_defer_except(tc, cell1); + + remap(tc, bio, result.block); + return DM_MAPIO_REMAPPED; case -ENODATA: if (get_pool_mode(tc->pool) == PM_READ_ONLY) { |