diff options
| author | Vivek Goyal <vgoyal@redhat.com> | 2020-02-28 11:34:53 -0500 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2020-04-02 19:15:03 -0700 |
| commit | 79fa974ff6bc3f7711f409c88a9552ab97b9ecb5 (patch) | |
| tree | d90fd951ba0dbdc6f6836bda6c9a6168bf440346 /drivers/s390 | |
| parent | f605a263e0690177ecc180417eacf2b5507dd177 (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.c | 15 |
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 { |