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authorVivek Goyal <vgoyal@redhat.com>2020-02-28 19:34:54 +0300
committerDan Williams <dan.j.williams@intel.com>2020-04-03 05:15:03 +0300
commitcdf6cdcd3b99a99ea9ecc1b05d1d040d5a69a134 (patch)
tree3cead6571d7db698580930a17654ee14b1fb7b47 /drivers/md/dm-linear.c
parent79fa974ff6bc3f7711f409c88a9552ab97b9ecb5 (diff)
downloadlinux-cdf6cdcd3b99a99ea9ecc1b05d1d040d5a69a134.tar.xz
dm,dax: Add dax zero_page_range operation
This patch adds support for dax zero_page_range operation to dm targets. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Mike Snitzer <snitzer@redhat.com> Link: https://lore.kernel.org/r/20200228163456.1587-5-vgoyal@redhat.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/md/dm-linear.c')
-rw-r--r--drivers/md/dm-linear.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 8d07fdf63a47..e1db43446327 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -201,10 +201,27 @@ static size_t linear_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff,
return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i);
}
+static int linear_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff,
+ size_t nr_pages)
+{
+ int ret;
+ struct linear_c *lc = ti->private;
+ struct block_device *bdev = lc->dev->bdev;
+ struct dax_device *dax_dev = lc->dev->dax_dev;
+ sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
+
+ dev_sector = linear_map_sector(ti, sector);
+ ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages << PAGE_SHIFT, &pgoff);
+ if (ret)
+ return ret;
+ return dax_zero_page_range(dax_dev, pgoff, nr_pages);
+}
+
#else
#define linear_dax_direct_access NULL
#define linear_dax_copy_from_iter NULL
#define linear_dax_copy_to_iter NULL
+#define linear_dax_zero_page_range NULL
#endif
static struct target_type linear_target = {
@@ -226,6 +243,7 @@ static struct target_type linear_target = {
.direct_access = linear_dax_direct_access,
.dax_copy_from_iter = linear_dax_copy_from_iter,
.dax_copy_to_iter = linear_dax_copy_to_iter,
+ .dax_zero_page_range = linear_dax_zero_page_range,
};
int __init dm_linear_init(void)