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authorKeith Busch <keith.busch@intel.com>2015-08-19 14:24:05 -0700
committerJens Axboe <axboe@fb.com>2015-08-19 14:26:02 -0700
commit03100aada96f0645bbcb89aea24c01f02d0ef1fa (patch)
treeba909d035a188206b101ae633f925e18d749f7cc /drivers/md
parentd2be537c3ba3568acd79cd178327b842e60d035e (diff)
block: Replace SG_GAPS with new queue limits mask
The SG_GAPS queue flag caused checks for bio vector alignment against PAGE_SIZE, but the device may have different constraints. This patch adds a queue limits so a driver with such constraints can set to allow requests that would have been unnecessarily split. The new gaps check takes the request_queue as a parameter to simplify the logic around invoking this function. This new limit makes the queue flag redundant, so removing it and all usage. Device-mappers will inherit the correct settings through blk_stack_limits(). Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-table.c13
1 files changed, 0 insertions, 13 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index afb4ad3dfeb3..e76ed003769e 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1380,14 +1380,6 @@ 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)
{
@@ -1508,11 +1500,6 @@ 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);
/*