diff options
| author | Toshi Kani <toshi.kani@hpe.com> | 2016-06-23 23:05:50 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-07-21 05:01:01 +0200 |
| commit | 163d4baaebe39c0e56d9c08597eab7b3ae0bf334 (patch) | |
| tree | a2874ed41e21f5163e45e6fbb177d94b13cb38ff /fs/block_dev.c | |
| parent | Btrfs: fix comparison in __btrfs_map_block() (diff) | |
| download | linux-163d4baaebe39c0e56d9c08597eab7b3ae0bf334.tar.xz linux-163d4baaebe39c0e56d9c08597eab7b3ae0bf334.zip | |
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 'fs/block_dev.c')
| -rw-r--r-- | fs/block_dev.c | 5 |
1 files changed, 3 insertions, 2 deletions
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; |