From: Vivek Goyal <vgoyal@redhat.com>
To: linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org,
hch@infradead.org, dan.j.williams@intel.com
Cc: dm-devel@redhat.com, vishal.l.verma@intel.com, vgoyal@redhat.com,
linux-s390@vger.kernel.org,
Gerald Schaefer <gerald.schaefer@de.ibm.com>
Subject: [PATCH v4 4/7] s390,dcssblk,dax: Add dax zero_page_range operation to dcssblk driver
Date: Mon, 17 Feb 2020 13:16:50 -0500 [thread overview]
Message-ID: <20200217181653.4706-5-vgoyal@redhat.com> (raw)
In-Reply-To: <20200217181653.4706-1-vgoyal@redhat.com>
Add dax operation zero_page_range for dcssblk driver.
CC: linux-s390@vger.kernel.org
Suggested-by: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
---
drivers/s390/block/dcssblk.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 63502ca537eb..331abab5d066 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -57,11 +57,28 @@ 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, u64 offset,
+ size_t len)
+{
+ long rc;
+ void *kaddr;
+ pgoff_t pgoff = offset >> PAGE_SHIFT;
+ unsigned page_offset = offset_in_page(offset);
+
+ rc = dax_direct_access(dax_dev, pgoff, 1, &kaddr, NULL);
+ if (rc < 0)
+ return rc;
+ memset(kaddr + page_offset, 0, len);
+ dax_flush(dax_dev, kaddr + page_offset, len);
+ 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 {
--
2.20.1
next prev parent reply other threads:[~2020-02-17 18:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-17 18:16 [PATCH v4 0/7] dax/pmem: Provide a dax operation to zero range of memory Vivek Goyal
2020-02-17 18:16 ` [PATCH v4 1/7] pmem: Add functions for reading/writing page to/from pmem Vivek Goyal
2020-02-18 17:07 ` [dm-devel] " Christoph Hellwig
2020-02-17 18:16 ` [PATCH v4 2/7] pmem: Enable pmem_do_write() to deal with arbitrary ranges Vivek Goyal
2020-02-18 17:09 ` [dm-devel] " Christoph Hellwig
2020-02-18 21:10 ` Vivek Goyal
2020-02-17 18:16 ` [PATCH v4 3/7] dax, pmem: Add a dax operation zero_page_range Vivek Goyal
2020-02-18 17:10 ` [dm-devel] " Christoph Hellwig
2020-02-17 18:16 ` Vivek Goyal [this message]
2020-02-17 18:16 ` [PATCH v4 5/7] dm,dax: Add dax zero_page_range operation Vivek Goyal
2020-02-17 18:16 ` [PATCH v4 6/7] dax,iomap: Start using dax native zero_page_range() Vivek Goyal
2020-02-17 18:16 ` [PATCH v4 7/7] dax,iomap: Add helper dax_iomap_zero() to zero a range Vivek Goyal
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