dm: fix missing imposition of queue_limits from dm_wq_work() thread

If a DM device was suspended when bios were issued to it, those bios
would be deferred using queue_io(). Once the DM device was resumed
dm_process_bio() could be called by dm_wq_work() for original bio that
still needs splitting. dm_process_bio()'s check for current->bio_list
(meaning call chain is within ->submit_bio) as a prerequisite for
calling blk_queue_split() for "abnormal IO" would result in
dm_process_bio() never imposing corresponding queue_limits
(e.g. discard_granularity, discard_max_bytes, etc).

Fix this by always having dm_wq_work() resubmit deferred bios using
submit_bio_noacct().

Side-effect is blk_queue_split() is always called for "abnormal IO" from
->submit_bio, be it from application thread or dm_wq_work() workqueue,
so proper bio splitting and depth-first bio submission is performed.
For sake of clarity, remove current->bio_list check before call to
blk_queue_split().

Also, remove dm_wq_work()'s use of dm_{get,put}_live_table() -- no
longer needed since IO will be reissued in terms of ->submit_bio.
And rename bio variable from 'c' to 'bio'.

Fixes: cf9c37865557 ("dm: fix comment in dm_process_bio()")
Reported-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index a1adcf0..80266b9 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1676,17 +1676,11 @@ static blk_qc_t dm_process_bio(struct mapped_device *md,
        }
 
        /*
-        * If in ->submit_bio we need to use blk_queue_split(), otherwise
-        * queue_limits for abnormal requests (e.g. discard, writesame, etc)
-        * won't be imposed.
-        * If called from dm_wq_work() for deferred bio processing, bio
-        * was already handled by following code with previous ->submit_bio.
+        * Use blk_queue_split() for abnormal IO (e.g. discard, writesame, etc)
+        * otherwise associated queue_limits won't be imposed.
         */
-       if (current->bio_list) {
-               if (is_abnormal_io(bio))
-                       blk_queue_split(&bio);
-               /* regular IO is split by __split_and_process_bio */
-       }
+       if (is_abnormal_io(bio))
+               blk_queue_split(&bio);
 
        if (dm_get_md_type(md) == DM_TYPE_NVME_BIO_BASED)
                return __process_bio(md, map, bio);
@@ -2383,29 +2377,19 @@ static int dm_wait_for_completion(struct mapped_device *md, long task_state)
  */
 static void dm_wq_work(struct work_struct *work)
 {
-       struct mapped_device *md = container_of(work, struct mapped_device,
-                                               work);
-       struct bio *c;
-       int srcu_idx;
-       struct dm_table *map;
-
-       map = dm_get_live_table(md, &srcu_idx);
+       struct mapped_device *md = container_of(work, struct mapped_device, work);
+       struct bio *bio;
 
        while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) {
                spin_lock_irq(&md->deferred_lock);
-               c = bio_list_pop(&md->deferred);
+               bio = bio_list_pop(&md->deferred);
                spin_unlock_irq(&md->deferred_lock);
 
-               if (!c)
+               if (!bio)
                        break;
 
-               if (dm_request_based(md))
-                       (void) submit_bio_noacct(c);
-               else
-                       (void) dm_process_bio(md, map, c);
+               submit_bio_noacct(bio);
        }
-
-       dm_put_live_table(md, srcu_idx);
 }
 
 static void dm_queue_flush(struct mapped_device *md)