/* * 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 version 2 * as published by the Free Software Foundation. * * 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/inet.h> #include <linux/pagemap.h> #include <linux/idr.h> #include <linux/sched.h> #include <net/9p/9p.h> #include <net/9p/client.h> #include "v9fs.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) { int retval; loff_t offset; char *buffer; struct p9_fid *fid; P9_DPRINTK(P9_DEBUG_VFS, "\n"); fid = filp->private_data; buffer = kmap(page); offset = page_offset(page); retval = p9_client_readn(fid, buffer, offset, PAGE_CACHE_SIZE); if (retval < 0) goto done; memset(buffer + retval, 0, PAGE_CACHE_SIZE - retval); flush_dcache_page(page); SetPageUptodate(page); retval = 0; done: kunmap(page); unlock_page(page); return retval; } const struct address_space_operations v9fs_addr_operations = { .readpage = v9fs_vfs_readpage, };