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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 <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>
This commit is contained in:
Toshi Kani
2016-06-23 17:05:50 -04:00
committed by Jens Axboe
parent df5c82a8dc
commit 163d4baaeb
5 changed files with 10 additions and 3 deletions
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fs/block_dev.c
+3 -2
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@@ -493,7 +493,7 @@ long bdev_direct_access(struct block_device *bdev, struct blk_dax_ctl *dax)
if (size < 0)
return size;
if (!ops->direct_access)
if (!blk_queue_dax(bdev_get_queue(bdev)) || !ops->direct_access)
return -EOPNOTSUPP;
if ((sector + DIV_ROUND_UP(size, 512)) >
part_nr_sects_read(bdev->bd_part))
@@ -1287,7 +1287,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdev->bd_disk = disk;
bdev->bd_queue = disk->queue;
bdev->bd_contains = bdev;
if (IS_ENABLED(CONFIG_BLK_DEV_DAX) && disk->fops->direct_access)
if (IS_ENABLED(CONFIG_BLK_DEV_DAX) &&
blk_queue_dax(disk->queue))
bdev->bd_inode->i_flags = S_DAX;
else
bdev->bd_inode->i_flags = 0;