From mboxrd@z Thu Jan 1 00:00:00 1970 From: Toshi Kani Subject: [PATCH 4/6] dm-linear: Add linear_direct_access() Date: Mon, 13 Jun 2016 16:21:35 -0600 Message-ID: <1465856497-19698-5-git-send-email-toshi.kani@hpe.com> References: <1465856497-19698-1-git-send-email-toshi.kani@hpe.com> Return-path: In-Reply-To: <1465856497-19698-1-git-send-email-toshi.kani@hpe.com> Sender: linux-kernel-owner@vger.kernel.org To: agk@redhat.com, snitzer@redhat.com, dan.j.williams@intel.com Cc: ross.zwisler@linux.intel.com, viro@zeniv.linux.org.uk, axboe@kernel.dk, toshi.kani@hpe.com, linux-nvdimm@lists.01.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-raid.ids Change dm-linear to implement direct_access function, linear_direct_access(), which maps sector and calls direct_access function of its target device. Signed-off-by: Toshi Kani Cc: Alasdair Kergon Cc: Mike Snitzer Cc: Dan Williams Cc: Ross Zwisler --- drivers/md/dm-linear.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 05c35aa..49bd7d2 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -141,6 +141,22 @@ 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; + struct block_device *tbdev; + const struct block_device_operations *tops; + sector_t tsector; + + lc = ti->private; + tbdev = lc->dev->bdev; + tops = tbdev->bd_disk->fops; + tsector = linear_map_sector(ti, sector); + + return tops->direct_access(tbdev, tsector, kaddr, pfn, size); +} + static struct target_type linear_target = { .name = "linear", .version = {1, 2, 1}, @@ -151,6 +167,7 @@ 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)