dm io: remove BIOSET_NEED_RESCUER flag from bios bioset

The BIOSET_NEED_RESCUER flag is only needed when a make_request_fn might
do two allocations from the one bioset, and the second one could block
until the first bio completes.

dm_io() is called from make_request_fn() context.  The closest it comes
to multiple allocations is in chunk_io() in dm-snap-persistent.  But
there the code uses a separate thread to avoid problems.

So BIOSET_NEED_RESCUER is not needed.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index b4357ed4d541621fa69eec798fdb3a7d85ae68a4..a8d914d5abbe6c91b4050349c46e80ad02f26249 100644 (file)
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -58,8 +58,7 @@ struct dm_io_client *dm_io_client_create(void)
        if (!client->pool)
                goto bad;
 
-       client->bios = bioset_create(min_ios, 0, (BIOSET_NEED_BVECS |
-                                                 BIOSET_NEED_RESCUER));
+       client->bios = bioset_create(min_ios, 0, BIOSET_NEED_BVECS);
        if (!client->bios)
                goto bad;