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426cc91a EVH |
1 | /* |
2 | * linux/fs/9p/trans_fd.c | |
3 | * | |
4 | * File Descriptor Transport Layer | |
5 | * | |
3cf6429a | 6 | * Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net> |
426cc91a EVH |
7 | * Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to: | |
21 | * Free Software Foundation | |
22 | * 51 Franklin Street, Fifth Floor | |
23 | * Boston, MA 02111-1301 USA | |
24 | * | |
25 | */ | |
26 | ||
27 | #include <linux/config.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/net.h> | |
30 | #include <linux/ipv6.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/un.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <linux/inet.h> | |
36 | #include <linux/idr.h> | |
37 | #include <linux/file.h> | |
38 | ||
39 | #include "debug.h" | |
40 | #include "v9fs.h" | |
41 | #include "transport.h" | |
42 | ||
43 | struct v9fs_trans_fd { | |
44 | struct file *in_file; | |
45 | struct file *out_file; | |
46 | }; | |
47 | ||
48 | /** | |
49 | * v9fs_fd_recv - receive from a socket | |
50 | * @v9ses: session information | |
51 | * @v: buffer to receive data into | |
52 | * @len: size of receive buffer | |
53 | * | |
54 | */ | |
55 | ||
56 | static int v9fs_fd_recv(struct v9fs_transport *trans, void *v, int len) | |
57 | { | |
58 | struct v9fs_trans_fd *ts = trans ? trans->priv : NULL; | |
59 | ||
60 | if (!trans || trans->status != Connected || !ts) | |
61 | return -EIO; | |
62 | ||
63 | return kernel_read(ts->in_file, ts->in_file->f_pos, v, len); | |
64 | } | |
65 | ||
66 | /** | |
67 | * v9fs_fd_send - send to a socket | |
68 | * @v9ses: session information | |
69 | * @v: buffer to send data from | |
70 | * @len: size of send buffer | |
71 | * | |
72 | */ | |
73 | ||
74 | static int v9fs_fd_send(struct v9fs_transport *trans, void *v, int len) | |
75 | { | |
76 | struct v9fs_trans_fd *ts = trans ? trans->priv : NULL; | |
77 | mm_segment_t oldfs = get_fs(); | |
78 | int ret = 0; | |
79 | ||
80 | if (!trans || trans->status != Connected || !ts) | |
81 | return -EIO; | |
82 | ||
83 | set_fs(get_ds()); | |
84 | /* The cast to a user pointer is valid due to the set_fs() */ | |
85 | ret = vfs_write(ts->out_file, (void __user *)v, len, &ts->out_file->f_pos); | |
86 | set_fs(oldfs); | |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
91 | /** | |
92 | * v9fs_fd_init - initialize file descriptor transport | |
93 | * @v9ses: session information | |
94 | * @addr: address of server to mount | |
95 | * @data: mount options | |
96 | * | |
97 | */ | |
98 | ||
99 | static int | |
100 | v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data) | |
101 | { | |
102 | struct v9fs_trans_fd *ts = NULL; | |
103 | struct v9fs_transport *trans = v9ses->transport; | |
104 | ||
105 | if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) { | |
106 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
107 | return -ENOPROTOOPT; | |
108 | } | |
109 | ||
426cc91a EVH |
110 | ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL); |
111 | ||
112 | if (!ts) | |
113 | return -ENOMEM; | |
114 | ||
115 | ts->in_file = fget( v9ses->rfdno ); | |
116 | ts->out_file = fget( v9ses->wfdno ); | |
117 | ||
118 | if (!ts->in_file || !ts->out_file) { | |
119 | if (ts->in_file) | |
120 | fput(ts->in_file); | |
121 | ||
122 | if (ts->out_file) | |
123 | fput(ts->out_file); | |
124 | ||
125 | kfree(ts); | |
126 | return -EIO; | |
127 | } | |
128 | ||
129 | trans->priv = ts; | |
130 | trans->status = Connected; | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | ||
136 | /** | |
137 | * v9fs_fd_close - shutdown file descriptor | |
138 | * @trans: private socket structure | |
139 | * | |
140 | */ | |
141 | ||
142 | static void v9fs_fd_close(struct v9fs_transport *trans) | |
143 | { | |
144 | struct v9fs_trans_fd *ts; | |
145 | ||
146 | if (!trans) | |
147 | return; | |
148 | ||
f5ef3c10 | 149 | ts = xchg(&trans->priv, NULL); |
426cc91a EVH |
150 | |
151 | if (!ts) | |
152 | return; | |
153 | ||
f5ef3c10 | 154 | trans->status = Disconnected; |
426cc91a EVH |
155 | if (ts->in_file) |
156 | fput(ts->in_file); | |
157 | ||
158 | if (ts->out_file) | |
159 | fput(ts->out_file); | |
160 | ||
161 | kfree(ts); | |
162 | } | |
163 | ||
3cf6429a LI |
164 | static unsigned int |
165 | v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt) | |
166 | { | |
167 | int ret, n; | |
168 | struct v9fs_trans_fd *ts; | |
169 | mm_segment_t oldfs; | |
170 | ||
171 | if (!trans) | |
172 | return -EIO; | |
173 | ||
174 | ts = trans->priv; | |
175 | if (trans->status != Connected || !ts) | |
176 | return -EIO; | |
177 | ||
178 | oldfs = get_fs(); | |
179 | set_fs(get_ds()); | |
180 | ||
181 | if (!ts->in_file->f_op || !ts->in_file->f_op->poll) { | |
182 | ret = -EIO; | |
183 | goto end; | |
184 | } | |
185 | ||
186 | ret = ts->in_file->f_op->poll(ts->in_file, pt); | |
187 | ||
188 | if (ts->out_file != ts->in_file) { | |
189 | if (!ts->out_file->f_op || !ts->out_file->f_op->poll) { | |
190 | ret = -EIO; | |
191 | goto end; | |
192 | } | |
193 | ||
194 | n = ts->out_file->f_op->poll(ts->out_file, pt); | |
195 | ||
196 | ret &= ~POLLOUT; | |
197 | n &= ~POLLIN; | |
198 | ||
199 | ret |= n; | |
200 | } | |
201 | ||
202 | end: | |
203 | set_fs(oldfs); | |
204 | return ret; | |
205 | } | |
206 | ||
207 | ||
426cc91a EVH |
208 | struct v9fs_transport v9fs_trans_fd = { |
209 | .init = v9fs_fd_init, | |
210 | .write = v9fs_fd_send, | |
211 | .read = v9fs_fd_recv, | |
212 | .close = v9fs_fd_close, | |
3cf6429a | 213 | .poll = v9fs_fd_poll, |
426cc91a EVH |
214 | }; |
215 |