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authorToshi Kani <toshi.kani@hpe.com>2016-06-23 17:05:50 -0400
committerJens Axboe <axboe@fb.com>2016-07-20 21:01:01 -0600
commit163d4baaebe39c0e56d9c08597eab7b3ae0bf334 (patch)
treea2874ed41e21f5163e45e6fbb177d94b13cb38ff /drivers/block/brd.c
parentdf5c82a8dcca1a5f23fefebae973d2dd0bf5aa11 (diff)
downloadlinux-163d4baaebe39c0e56d9c08597eab7b3ae0bf334.tar.bz2
block: add QUEUE_FLAG_DAX for devices to advertise their DAX support
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 <toshi.kani@hpe.com> Acked-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: <linux-s390@vger.kernel.org> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/brd.c')
-rw-r--r--drivers/block/brd.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index f5b0d6f4e09f..dd96a935fba0 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -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;