Messages in this thread Patch in this message | | | From | Mike Snitzer <> | Subject | [PATCH v3 4/4] dm linear: add DAX support | Date | Thu, 23 Jun 2016 17:05:53 -0400 |
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From: Toshi Kani <toshi.kani@hpe.com>
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> Cc: Alasdair Kergon <agk@redhat.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> --- drivers/md/dm-linear.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 05c35aa..6d35dd4 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) -- 2.7.4 (Apple Git-66)
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