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426cc91a EVH |
1 | /* |
2 | * linux/fs/9p/trans_fd.c | |
3 | * | |
4 | * File Descriptor Transport Layer | |
5 | * | |
6 | * Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
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/config.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/ipv6.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/un.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <linux/inet.h> | |
35 | #include <linux/idr.h> | |
36 | #include <linux/file.h> | |
37 | ||
38 | #include "debug.h" | |
39 | #include "v9fs.h" | |
40 | #include "transport.h" | |
41 | ||
42 | struct v9fs_trans_fd { | |
43 | struct file *in_file; | |
44 | struct file *out_file; | |
45 | }; | |
46 | ||
47 | /** | |
48 | * v9fs_fd_recv - receive from a socket | |
49 | * @v9ses: session information | |
50 | * @v: buffer to receive data into | |
51 | * @len: size of receive buffer | |
52 | * | |
53 | */ | |
54 | ||
55 | static int v9fs_fd_recv(struct v9fs_transport *trans, void *v, int len) | |
56 | { | |
57 | struct v9fs_trans_fd *ts = trans ? trans->priv : NULL; | |
58 | ||
59 | if (!trans || trans->status != Connected || !ts) | |
60 | return -EIO; | |
61 | ||
62 | return kernel_read(ts->in_file, ts->in_file->f_pos, v, len); | |
63 | } | |
64 | ||
65 | /** | |
66 | * v9fs_fd_send - send to a socket | |
67 | * @v9ses: session information | |
68 | * @v: buffer to send data from | |
69 | * @len: size of send buffer | |
70 | * | |
71 | */ | |
72 | ||
73 | static int v9fs_fd_send(struct v9fs_transport *trans, void *v, int len) | |
74 | { | |
75 | struct v9fs_trans_fd *ts = trans ? trans->priv : NULL; | |
76 | mm_segment_t oldfs = get_fs(); | |
77 | int ret = 0; | |
78 | ||
79 | if (!trans || trans->status != Connected || !ts) | |
80 | return -EIO; | |
81 | ||
82 | set_fs(get_ds()); | |
83 | /* The cast to a user pointer is valid due to the set_fs() */ | |
84 | ret = vfs_write(ts->out_file, (void __user *)v, len, &ts->out_file->f_pos); | |
85 | set_fs(oldfs); | |
86 | ||
87 | return ret; | |
88 | } | |
89 | ||
90 | /** | |
91 | * v9fs_fd_init - initialize file descriptor transport | |
92 | * @v9ses: session information | |
93 | * @addr: address of server to mount | |
94 | * @data: mount options | |
95 | * | |
96 | */ | |
97 | ||
98 | static int | |
99 | v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data) | |
100 | { | |
101 | struct v9fs_trans_fd *ts = NULL; | |
102 | struct v9fs_transport *trans = v9ses->transport; | |
103 | ||
104 | if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) { | |
105 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
106 | return -ENOPROTOOPT; | |
107 | } | |
108 | ||
109 | sema_init(&trans->writelock, 1); | |
110 | sema_init(&trans->readlock, 1); | |
111 | ||
112 | ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL); | |
113 | ||
114 | if (!ts) | |
115 | return -ENOMEM; | |
116 | ||
117 | ts->in_file = fget( v9ses->rfdno ); | |
118 | ts->out_file = fget( v9ses->wfdno ); | |
119 | ||
120 | if (!ts->in_file || !ts->out_file) { | |
121 | if (ts->in_file) | |
122 | fput(ts->in_file); | |
123 | ||
124 | if (ts->out_file) | |
125 | fput(ts->out_file); | |
126 | ||
127 | kfree(ts); | |
128 | return -EIO; | |
129 | } | |
130 | ||
131 | trans->priv = ts; | |
132 | trans->status = Connected; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | ||
138 | /** | |
139 | * v9fs_fd_close - shutdown file descriptor | |
140 | * @trans: private socket structure | |
141 | * | |
142 | */ | |
143 | ||
144 | static void v9fs_fd_close(struct v9fs_transport *trans) | |
145 | { | |
146 | struct v9fs_trans_fd *ts; | |
147 | ||
148 | if (!trans) | |
149 | return; | |
150 | ||
151 | trans->status = Disconnected; | |
152 | ts = trans->priv; | |
153 | ||
154 | if (!ts) | |
155 | return; | |
156 | ||
157 | if (ts->in_file) | |
158 | fput(ts->in_file); | |
159 | ||
160 | if (ts->out_file) | |
161 | fput(ts->out_file); | |
162 | ||
163 | kfree(ts); | |
164 | } | |
165 | ||
166 | struct v9fs_transport v9fs_trans_fd = { | |
167 | .init = v9fs_fd_init, | |
168 | .write = v9fs_fd_send, | |
169 | .read = v9fs_fd_recv, | |
170 | .close = v9fs_fd_close, | |
171 | }; | |
172 |