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dm stripe: add DAX support 

Change dm-stripe to implement direct_access function,
stripe_direct_access(), which maps bdev and 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 2016-06-24 12:23:30 -06:00 committed by Mike Snitzer
parent f8df1fdf18
commit beec25b457
1 changed files with 25 additions and 1 deletions
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26
drivers/md/dm-stripe.c
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@ -308,6 +308,29 @@ static int stripe_map(struct dm_target *ti, struct bio *bio)
return DM_MAPIO_REMAPPED;
}
static long stripe_direct_access(struct dm_target *ti, sector_t sector,
void __pmem **kaddr, pfn_t *pfn, long size)
{
struct stripe_c *sc = ti->private;
uint32_t stripe;
struct block_device *bdev;
struct blk_dax_ctl dax = {
.size = size,
};
long ret;
stripe_map_sector(sc, sector, &stripe, &dax.sector);
dax.sector += sc->stripe[stripe].physical_start;
bdev = sc->stripe[stripe].dev->bdev;
ret = bdev_direct_access(bdev, &dax);
*kaddr = dax.addr;
*pfn = dax.pfn;
return ret;
}
/*
* Stripe status:
*
@ -416,7 +439,7 @@ static void stripe_io_hints(struct dm_target *ti,
static struct target_type stripe_target = {
.name = "striped",
.version = {1, 5, 1},
.version = {1, 6, 0},
.module = THIS_MODULE,
.ctr = stripe_ctr,
.dtr = stripe_dtr,
@ -425,6 +448,7 @@ static struct target_type stripe_target = {
.status = stripe_status,
.iterate_devices = stripe_iterate_devices,
.io_hints = stripe_io_hints,
.direct_access = stripe_direct_access,
};
int __init dm_stripe_init(void)