Signed-off-by: Venkateswararao Jujjuri <jvrao@xxxxxxxxxxxxxxxxxx>
---
net/9p/Makefile | 1 +
net/9p/trans_common.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++
net/9p/trans_common.h | 26 ++++++++++++++
3 files changed, 115 insertions(+), 0 deletions(-)
create mode 100644 net/9p/trans_common.c
create mode 100644 net/9p/trans_common.h
diff --git a/net/9p/Makefile b/net/9p/Makefile
index 198a640..a0874cc 100644
--- a/net/9p/Makefile
+++ b/net/9p/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_NET_9P_RDMA) += 9pnet_rdma.o
util.o \
protocol.o \
trans_fd.o \
+ trans_common.o \
9pnet_virtio-objs := \
trans_virtio.o \
diff --git a/net/9p/trans_common.c b/net/9p/trans_common.c
new file mode 100644
index 0000000..dad57d2
--- /dev/null
+++ b/net/9p/trans_common.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Author Venkateswararao Jujjuri <jvrao@xxxxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#include <linux/slab.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
+#include <linux/scatterlist.h>
+#include "trans_common.h"
+
+/**
+ * p9_release_req_pages - Release pages after the transaction.
+ * @*private: PDU's private page of type virtio_rpage_info_t
+ */
+void
+p9_release_req_pages(void *private)
+{
+ virtio_rpage_info_t *vpinfo = private;
+ int i = 0;
+
+ while (vpinfo->vp_data[i] && vpinfo->vp_nr_pages--) {
+ put_page(vpinfo->vp_data[i]);
+ i++;
+ }
+}
+
+/**
+ * payload_gup - Calculates number of pages that needs to be pinned and
+ * pins them ehter for read/write through get_user_pages_fast().
+ */
+int
+payload_gup(struct p9_req_t *req, size_t *pdata_off, int *pdata_len, u8 rw)
+{
+ int nr_pages;
+ uint32_t first_page_bytes = 0;
+ uint32_t pdata_mapped_pages;
+ virtio_rpage_info_t *rpinfo;
+
+ nr_pages = req->tc->pbuf_size >> PAGE_SHIFT;
+ *pdata_off = (size_t)req->tc->pbuf & (PAGE_SIZE-1);
+
+ if (*pdata_off)
+ first_page_bytes = min((PAGE_SIZE - *pdata_off),
+ req->tc->pbuf_size);
+
+ if (req->tc->pbuf_size - (first_page_bytes + (nr_pages << PAGE_SHIFT))){
+ /* trailing partial page */
+ nr_pages++;
+ }
+ if (first_page_bytes) {
+ /* leading partial page */
+ nr_pages++;
+ }
+ /* TODO: Use buffer on PDU instead of allocating */
+ rpinfo = kmalloc(sizeof(virtio_rpage_info_t) +
+ sizeof(struct page *) * nr_pages, GFP_KERNEL);
+ req->tc->private = (void *)rpinfo;
+ pdata_mapped_pages = get_user_pages_fast((unsigned long)req->tc->pbuf,
+ nr_pages, rw, &rpinfo->vp_data[0]);
+
+ if (pdata_mapped_pages < 0) {
+ printk("get_user_pages_fast failed:%d udata:%p" "nr_pages:%d\n",
+ pdata_mapped_pages, req->tc->pbuf, nr_pages);
+ pdata_mapped_pages = 0;
+ kfree(rpinfo);
+ return -EIO;
+ }
+ rpinfo->vp_nr_pages = pdata_mapped_pages;
+ if (*pdata_off) {
+ *pdata_len = first_page_bytes;
+ *pdata_len += min((req->tc->pbuf_size - *pdata_len),
+ ((size_t)pdata_mapped_pages - 1) << PAGE_SHIFT);
+ } else {
+ *pdata_len = min (req->tc->pbuf_size,
+ (size_t)pdata_mapped_pages << PAGE_SHIFT);
+ }
+ return 0;
+}
diff --git a/net/9p/trans_common.h b/net/9p/trans_common.h
new file mode 100644
index 0000000..8c85392
--- /dev/null
+++ b/net/9p/trans_common.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Author Venkateswararao Jujjuri <jvrao@xxxxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+/**
+ * struct virtio_rpage_info - To store mapped page information in PDU.
+ * @vp_nr_pages: Number of mapped pages
+ * @vp_data: Array of page pointers
+ */
+typedef struct virtio_rpage_info {
+ int vp_nr_pages;
+ struct page *vp_data[0];
+} virtio_rpage_info_t;
+
+void p9_release_req_pages(void *);
+int payload_gup(struct p9_req_t *, size_t *, int *, u8);
--
1.6.5.2
--
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