cifs: teach smb_send_rqst how to handle arrays of pages

Add code that allows smb_send_rqst to send an array of pages after the
initial kvec array has been sent. For now, we simply kmap the page
array and send it using the standard smb_send_kvec function. Eventually,
we may want to convert this code to use kernel_sendpage under the hood
and avoid the kmap altogether for the page data.

Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 54 insertions, 2 deletions

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 8ff4c5f3670..381dbb77847 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -28,6 +28,7 @@
 #include <linux/delay.h>
 #include <linux/freezer.h>
 #include <linux/tcp.h>
+#include <linux/highmem.h>
 #include <asm/uaccess.h>
 #include <asm/processor.h>
 #include <linux/mempool.h>
@@ -240,6 +241,38 @@ smb_send_kvec(struct TCP_Server_Info *server, struct kvec *iov, size_t n_vec,
         return rc;
 }
 
+/**
+ * rqst_page_to_kvec - Turn a slot in the smb_rqst page array into a kvec
+ * @rqst: pointer to smb_rqst
+ * @idx: index into the array of the page
+ * @iov: pointer to struct kvec that will hold the result
+ *
+ * Helper function to convert a slot in the rqst->rq_pages array into a kvec.
+ * The page will be kmapped and the address placed into iov_base. The length
+ * will then be adjusted according to the ptailoff.
+ */
+static void
+cifs_rqst_page_to_kvec(struct smb_rqst *rqst, unsigned int idx,
+                        struct kvec *iov)
+{
+        /*
+         * FIXME: We could avoid this kmap altogether if we used
+         * kernel_sendpage instead of kernel_sendmsg. That will only
+         * work if signing is disabled though as sendpage inlines the
+         * page directly into the fraglist. If userspace modifies the
+         * page after we calculate the signature, then the server will
+         * reject it and may break the connection. kernel_sendmsg does
+         * an extra copy of the data and avoids that issue.
+         */
+        iov->iov_base = kmap(rqst->rq_pages[idx]);
+
+        /* if last page, don't send beyond this offset into page */
+        if (idx == (rqst->rq_npages - 1))
+                iov->iov_len = rqst->rq_tailsz;
+        else
+                iov->iov_len = rqst->rq_pagesz;
+}
+
 static int
 smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst)
 {
@@ -247,7 +280,8 @@ smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst)
         struct kvec *iov = rqst->rq_iov;
         int n_vec = rqst->rq_nvec;
         unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base);
-        size_t total_len;
+        unsigned int i;
+        size_t total_len = 0, sent;
         struct socket *ssocket = server->ssocket;
         int val = 1;
 
@@ -258,8 +292,26 @@ smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst)
         kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK,
                                 (char *)&val, sizeof(val));
 
-        rc = smb_send_kvec(server, iov, n_vec, &total_len);
+        rc = smb_send_kvec(server, iov, n_vec, &sent);
+        if (rc < 0)
+                goto uncork;
+
+        total_len += sent;
+
+        /* now walk the page array and send each page in it */
+        for (i = 0; i < rqst->rq_npages; i++) {
+                struct kvec p_iov;
+
+                cifs_rqst_page_to_kvec(rqst, i, &p_iov);
+                rc = smb_send_kvec(server, &p_iov, 1, &sent);
+                kunmap(rqst->rq_pages[i]);
+                if (rc < 0)
+                        break;
+
+                total_len += sent;
+        }
 
+uncork:
         /* uncork it */
         val = 0;
         kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK,