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block: add QUEUE_FLAG_DAX for devices to advertise their DAX support

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Currently, presence of direct_access() in block_device_operations
indicates support of DAX on its block device.  Because
block_device_operations is instantiated with 'const', this DAX
capablity may not be enabled conditinally.

In preparation for supporting DAX to device-mapper devices, add
QUEUE_FLAG_DAX to request_queue flags to advertise their DAX
support.  This will allow to set the DAX capability based on how
mapped device is composed.

Signed-off-by: Toshi Kani <[email protected]>
Acked-by: Dan Williams <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Ross Zwisler <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Toshi Kani 2016-06-23 17:05:50 -04:00 • committed by Jens Axboe
commit 163d4baaeb
5 changed files with 10 additions and 3 deletions
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1
drivers/nvdimm/pmem.c
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@ -283,6 +283,7 @@ static int pmem_attach_disk(struct device *dev,
blk_queue_max_hw_sectors(q, UINT_MAX);
blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
queue_flag_set_unlocked(QUEUE_FLAG_DAX, q);
q->queuedata = pmem;
disk = alloc_disk_node(0, nid);