leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

dm linear: add DAX support

Browse Source 
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>
This commit is contained in:
Toshi Kani 2016-06-22 17:54:54 -06:00 committed by Mike Snitzer
parent 545ed20e6d
commit 84b22f8378
1 changed files with 20 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/md/dm-linear.c
View File

@ -141,9 +141,27 @@ static int linear_iterate_devices(struct dm_target *ti,
return fn(ti, lc->dev, lc->start, ti->len, data); 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 = { static struct target_type linear_target = {
.name = "linear", .name = "linear",
.version = {1, 2, 1}, .version = {1, 3, 0},
.module = THIS_MODULE, .module = THIS_MODULE,
.ctr = linear_ctr, .ctr = linear_ctr,
.dtr = linear_dtr, .dtr = linear_dtr,
@ -151,6 +169,7 @@ static struct target_type linear_target = {
.status = linear_status, .status = linear_status,
.prepare_ioctl = linear_prepare_ioctl, .prepare_ioctl = linear_prepare_ioctl,
.iterate_devices = linear_iterate_devices, .iterate_devices = linear_iterate_devices,
.direct_access = linear_direct_access,
}; };
int __init dm_linear_init(void) int __init dm_linear_init(void)