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 EVH |
40 | #include "v9fs_vfs.h" |
41 | #include "fid.h" | |
42 | ||
43 | /** | |
44 | * v9fs_vfs_readpage - read an entire page in from 9P | |
45 | * | |
46 | * @file: file being read | |
47 | * @page: structure to page | |
48 | * | |
49 | */ | |
50 | ||
51 | static int v9fs_vfs_readpage(struct file *filp, struct page *page) | |
52 | { | |
bd238fb4 LI |
53 | int retval; |
54 | loff_t offset; | |
55 | char *buffer; | |
56 | struct p9_fid *fid; | |
e03abc0c | 57 | |
bd238fb4 LI |
58 | P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
59 | fid = filp->private_data; | |
147b31cf | 60 | buffer = kmap(page); |
bd238fb4 | 61 | offset = page_offset(page); |
147b31cf | 62 | |
bd238fb4 LI |
63 | retval = p9_client_readn(fid, buffer, offset, PAGE_CACHE_SIZE); |
64 | if (retval < 0) | |
65 | goto done; | |
147b31cf | 66 | |
bd238fb4 | 67 | memset(buffer + retval, 0, PAGE_CACHE_SIZE - retval); |
147b31cf EVH |
68 | flush_dcache_page(page); |
69 | SetPageUptodate(page); | |
70 | retval = 0; | |
71 | ||
bd238fb4 | 72 | done: |
147b31cf EVH |
73 | kunmap(page); |
74 | unlock_page(page); | |
75 | return retval; | |
76 | } | |
77 | ||
f5e54d6e | 78 | const struct address_space_operations v9fs_addr_operations = { |
147b31cf EVH |
79 | .readpage = v9fs_vfs_readpage, |
80 | }; |