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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>
This commit is contained in:
NeilBrown 2017-08-30 08:10:18 +10:00 committed by Mike Snitzer
parent 80cd175783
commit c110a4b6e6
1 changed files with 1 additions and 2 deletions
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3
drivers/md/dm-io.c
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@ -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;