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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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4
drivers/block/brd.c
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@ -509,7 +509,9 @@ static struct brd_device *brd_alloc(int i)
blk_queue_max_discard_sectors(brd->brd_queue, UINT_MAX);
brd->brd_queue->limits.discard_zeroes_data = 1;
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, brd->brd_queue);
#ifdef CONFIG_BLK_DEV_RAM_DAX
queue_flag_set_unlocked(QUEUE_FLAG_DAX, brd->brd_queue);
#endif
disk = brd->brd_disk = alloc_disk(max_part);
if (!disk)
goto out_free_queue;