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authorToshi Kani <toshi.kani@hpe.com>2016-06-22 17:54:54 -0600
committerMike Snitzer <snitzer@redhat.com>2016-07-20 23:49:49 -0400
commit84b22f8378cf493524043a0a8dd567c58c64546f (patch)
tree875436c2bf200ce6ca5a70c0a6426926a8386176 /drivers/md
parent545ed20e6df68a4d2584a29a2a28ee8b2f7e9547 (diff)
dm linear: add DAX support
Change dm-linear to implement direct_access function, linear_direct_access(), which maps sector and calls direct_access function of its physical target device. Signed-off-by: Toshi Kani <toshi.kani@hpe.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-linear.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 05c35aacb3aa..6d35dd4e9efb 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -141,9 +141,27 @@ static int linear_iterate_devices(struct dm_target *ti,
return fn(ti, lc->dev, lc->start, ti->len, data);
}
+static long linear_direct_access(struct dm_target *ti, sector_t sector,
+ void __pmem **kaddr, pfn_t *pfn, long size)
+{
+ struct linear_c *lc = ti->private;
+ struct block_device *bdev = lc->dev->bdev;
+ struct blk_dax_ctl dax = {
+ .sector = linear_map_sector(ti, sector),
+ .size = size,
+ };
+ long ret;
+
+ ret = bdev_direct_access(bdev, &dax);
+ *kaddr = dax.addr;
+ *pfn = dax.pfn;
+
+ return ret;
+}
+
static struct target_type linear_target = {
.name = "linear",
- .version = {1, 2, 1},
+ .version = {1, 3, 0},
.module = THIS_MODULE,
.ctr = linear_ctr,
.dtr = linear_dtr,
@@ -151,6 +169,7 @@ static struct target_type linear_target = {
.status = linear_status,
.prepare_ioctl = linear_prepare_ioctl,
.iterate_devices = linear_iterate_devices,
+ .direct_access = linear_direct_access,
};
int __init dm_linear_init(void)