1 files changed, 109 insertions, 0 deletions

diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
new file mode 100644
index 000000000000..8100fb5171b7
--- /dev/null
+++ b/fs/9p/vfs_addr.c
@@ -0,0 +1,109 @@
+/*
+ *  linux/fs/9p/vfs_addr.c
+ *
+ * This file contians vfs address (mmap) ops for 9P2000.
+ *
+ *  Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to:
+ *  Free Software Foundation
+ *  51 Franklin Street, Fifth Floor
+ *  Boston, MA  02111-1301  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/inet.h>
+#include <linux/version.h>
+#include <linux/pagemap.h>
+#include <linux/idr.h>
+
+#include "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "fid.h"
+
+/**
+ * v9fs_vfs_readpage - read an entire page in from 9P
+ *
+ * @file: file being read
+ * @page: structure to page
+ *
+ */
+
+static int v9fs_vfs_readpage(struct file *filp, struct page *page)
+{
+        char *buffer = NULL;
+        int retval = -EIO;
+        loff_t offset = page_offset(page);
+        int count = PAGE_CACHE_SIZE;
+        struct inode *inode = filp->f_dentry->d_inode;
+        struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
+        int rsize = v9ses->maxdata - V9FS_IOHDRSZ;
+        struct v9fs_fid *v9f = filp->private_data;
+        struct v9fs_fcall *fcall = NULL;
+        int fid = v9f->fid;
+        int total = 0;
+        int result = 0;
+
+        buffer = kmap(page);
+        do {
+                if (count < rsize)
+                        rsize = count;
+
+                result = v9fs_t_read(v9ses, fid, offset, rsize, &fcall);
+
+                if (result < 0) {
+                        printk(KERN_ERR "v9fs_t_read returned %d\n",
+                               result);
+
+                        kfree(fcall);
+                        goto UnmapAndUnlock;
+                } else
+                        offset += result;
+
+                memcpy(buffer, fcall->params.rread.data, result);
+
+                count -= result;
+                buffer += result;
+                total += result;
+
+                kfree(fcall);
+
+                if (result < rsize)
+                        break;
+        } while (count);
+
+        memset(buffer, 0, count);
+        flush_dcache_page(page);
+        SetPageUptodate(page);
+        retval = 0;
+
+UnmapAndUnlock:
+        kunmap(page);
+        unlock_page(page);
+        return retval;
+}
+
+struct address_space_operations v9fs_addr_operations = {
+      .readpage = v9fs_vfs_readpage,
+};