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| author |   Keith Busch <keith.busch@intel.com> | 2015-01-24 15:10:49 -0700 |
|---|---|---|
| committer |   Mike Snitzer <snitzer@redhat.com> | 2015-02-11 10:25:46 -0500 |
| commit | a4afe76b2b922e6197944d7be0be7a18b53175ae (patch) | |
| tree | 8987fb59e627198bbfbb2c425b47a7880fed369a /drivers/md | |
| parent | dm snapshot: remove unnecessary NULL checks before vfree() calls (diff) | |
| download | linux-dev-a4afe76b2b922e6197944d7be0be7a18b53175ae.tar.xz linux-dev-a4afe76b2b922e6197944d7be0be7a18b53175ae.zip | |
dm: inherit QUEUE_FLAG_SG_GAPS flags from underlying queues
A DM device must inherit the QUEUE_FLAG_SG_GAPS flags from its
underlying block devices' request queues.
This fixes problems when submitting cloned requests to multipathed
devices requiring virtually contiguous buffers.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-table.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 14954d844668..6554d9148927 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1389,6 +1389,14 @@ static int queue_supports_sg_merge(struct dm_target *ti, struct dm_dev *dev, return q && !test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags); } +static int queue_supports_sg_gaps(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t len, void *data) +{ + struct request_queue *q = bdev_get_queue(dev->bdev); + + return q && !test_bit(QUEUE_FLAG_SG_GAPS, &q->queue_flags); +} + static bool dm_table_all_devices_attribute(struct dm_table *t, iterate_devices_callout_fn func) { @@ -1509,6 +1517,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, else queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q); + if (dm_table_all_devices_attribute(t, queue_supports_sg_gaps)) + queue_flag_clear_unlocked(QUEUE_FLAG_SG_GAPS, q); + else + queue_flag_set_unlocked(QUEUE_FLAG_SG_GAPS, q); + dm_table_set_integrity(t); /* |