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authorVivek Goyal <vgoyal@redhat.com>2020-02-28 11:34:53 -0500
committerDan Williams <dan.j.williams@intel.com>2020-04-02 19:15:03 -0700
commit79fa974ff6bc3f7711f409c88a9552ab97b9ecb5 (patch)
treed90fd951ba0dbdc6f6836bda6c9a6168bf440346 /drivers/s390
parentf605a263e0690177ecc180417eacf2b5507dd177 (diff)
s390,dcssblk,dax: Add dax zero_page_range operation to dcssblk driver
Add dax operation zero_page_range for dcssblk driver. Suggested-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> CC: linux-s390@vger.kernel.org Link: https://lore.kernel.org/r/20200228163456.1587-4-vgoyal@redhat.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/block/dcssblk.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 63502ca537eb..ab3e2898816c 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -57,11 +57,26 @@ static size_t dcssblk_dax_copy_to_iter(struct dax_device *dax_dev,
return copy_to_iter(addr, bytes, i);
}
+static int dcssblk_dax_zero_page_range(struct dax_device *dax_dev,
+ pgoff_t pgoff, size_t nr_pages)
+{
+ long rc;
+ void *kaddr;
+
+ rc = dax_direct_access(dax_dev, pgoff, nr_pages, &kaddr, NULL);
+ if (rc < 0)
+ return rc;
+ memset(kaddr, 0, nr_pages << PAGE_SHIFT);
+ dax_flush(dax_dev, kaddr, nr_pages << PAGE_SHIFT);
+ return 0;
+}
+
static const struct dax_operations dcssblk_dax_ops = {
.direct_access = dcssblk_dax_direct_access,
.dax_supported = generic_fsdax_supported,
.copy_from_iter = dcssblk_dax_copy_from_iter,
.copy_to_iter = dcssblk_dax_copy_to_iter,
+ .zero_page_range = dcssblk_dax_zero_page_range,
};
struct dcssblk_dev_info {