From 163d4baaebe39c0e56d9c08597eab7b3ae0bf334 Mon Sep 17 00:00:00 2001 From: Toshi Kani Date: Thu, 23 Jun 2016 17:05:50 -0400 Subject: 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 Acked-by: Dan Williams Signed-off-by: Mike Snitzer Cc: Jens Axboe Cc: Ross Zwisler Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: Signed-off-by: Jens Axboe --- fs/block_dev.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'fs/block_dev.c') diff --git a/fs/block_dev.c b/fs/block_dev.c index 71ccab1d22c6..d012be4ab977 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -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; -- cgit v1.2.3