Commit | Line | Data |
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147b31cf EVH |
1 | /* |
2 | * linux/fs/9p/vfs_addr.c | |
3 | * | |
4 | * This file contians vfs address (mmap) ops for 9P2000. | |
5 | * | |
6 | * Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
147b31cf EVH |
12 | * |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to: | |
20 | * Free Software Foundation | |
21 | * 51 Franklin Street, Fifth Floor | |
22 | * Boston, MA 02111-1301 USA | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/file.h> | |
30 | #include <linux/stat.h> | |
31 | #include <linux/string.h> | |
147b31cf | 32 | #include <linux/inet.h> |
147b31cf EVH |
33 | #include <linux/pagemap.h> |
34 | #include <linux/idr.h> | |
e8edc6e0 | 35 | #include <linux/sched.h> |
bd238fb4 LI |
36 | #include <net/9p/9p.h> |
37 | #include <net/9p/client.h> | |
147b31cf | 38 | |
147b31cf | 39 | #include "v9fs.h" |
147b31cf | 40 | #include "v9fs_vfs.h" |
147b31cf EVH |
41 | |
42 | /** | |
43 | * v9fs_vfs_readpage - read an entire page in from 9P | |
44 | * | |
ee443996 | 45 | * @filp: file being read |
147b31cf EVH |
46 | * @page: structure to page |
47 | * | |
48 | */ | |
49 | ||
50 | static int v9fs_vfs_readpage(struct file *filp, struct page *page) | |
51 | { | |
bd238fb4 LI |
52 | int retval; |
53 | loff_t offset; | |
54 | char *buffer; | |
e03abc0c | 55 | |
bd238fb4 | 56 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
147b31cf | 57 | buffer = kmap(page); |
bd238fb4 | 58 | offset = page_offset(page); |
147b31cf | 59 | |
fbedadc1 | 60 | retval = v9fs_file_readn(filp, buffer, NULL, offset, PAGE_CACHE_SIZE); |
bd238fb4 LI |
61 | if (retval < 0) |
62 | goto done; | |
147b31cf | 63 | |
bd238fb4 | 64 | memset(buffer + retval, 0, PAGE_CACHE_SIZE - retval); |
147b31cf EVH |
65 | flush_dcache_page(page); |
66 | SetPageUptodate(page); | |
67 | retval = 0; | |
68 | ||
bd238fb4 | 69 | done: |
147b31cf EVH |
70 | kunmap(page); |
71 | unlock_page(page); | |
72 | return retval; | |
73 | } | |
74 | ||
f5e54d6e | 75 | const struct address_space_operations v9fs_addr_operations = { |
147b31cf EVH |
76 | .readpage = v9fs_vfs_readpage, |
77 | }; |