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-rw-r--r--drivers/md/dm-thin.c84
1 files changed, 59 insertions, 25 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 25dfd2311a6..41c9e81ba74 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) {