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e69e7fe5 EVH |
1 | /* |
2 | * linux/fs/9p/vfs_file.c | |
3 | * | |
4 | * This file contians vfs file ops for 9P2000. | |
5 | * | |
6 | * Copyright (C) 2004 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 | |
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/module.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/file.h> | |
31 | #include <linux/stat.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/smp_lock.h> | |
34 | #include <linux/inet.h> | |
35 | #include <linux/version.h> | |
36 | #include <linux/list.h> | |
37 | #include <asm/uaccess.h> | |
38 | #include <linux/idr.h> | |
39 | ||
40 | #include "debug.h" | |
41 | #include "v9fs.h" | |
42 | #include "9p.h" | |
43 | #include "v9fs_vfs.h" | |
44 | #include "fid.h" | |
45 | ||
46 | /** | |
47 | * v9fs_file_open - open a file (or directory) | |
48 | * @inode: inode to be opened | |
49 | * @file: file being opened | |
50 | * | |
51 | */ | |
52 | ||
53 | int v9fs_file_open(struct inode *inode, struct file *file) | |
54 | { | |
55 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
0b8dd177 | 56 | struct v9fs_fid *v9fid, *fid; |
e69e7fe5 EVH |
57 | struct v9fs_fcall *fcall = NULL; |
58 | int open_mode = 0; | |
59 | unsigned int iounit = 0; | |
60 | int newfid = -1; | |
61 | long result = -1; | |
62 | ||
0b8dd177 LI |
63 | dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file); |
64 | ||
65 | v9fid = v9fs_fid_get_created(file->f_dentry); | |
66 | if (!v9fid) | |
67 | v9fid = v9fs_fid_lookup(file->f_dentry); | |
e69e7fe5 EVH |
68 | |
69 | if (!v9fid) { | |
e69e7fe5 | 70 | dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n"); |
0b8dd177 LI |
71 | return -EBADF; |
72 | } | |
e69e7fe5 | 73 | |
0b8dd177 LI |
74 | if (!v9fid->fidcreate) { |
75 | fid = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL); | |
76 | if (fid == NULL) { | |
77 | dprintk(DEBUG_ERROR, "Out of Memory\n"); | |
78 | return -ENOMEM; | |
79 | } | |
e69e7fe5 | 80 | |
0b8dd177 LI |
81 | fid->fidopen = 0; |
82 | fid->fidcreate = 0; | |
83 | fid->fidclunked = 0; | |
84 | fid->iounit = 0; | |
85 | fid->v9ses = v9ses; | |
e69e7fe5 EVH |
86 | |
87 | newfid = v9fs_get_idpool(&v9ses->fidpool); | |
88 | if (newfid < 0) { | |
89 | eprintk(KERN_WARNING, "newfid fails!\n"); | |
90 | return -ENOSPC; | |
91 | } | |
92 | ||
93 | result = | |
0b8dd177 LI |
94 | v9fs_t_walk(v9ses, v9fid->fid, newfid, NULL, NULL); |
95 | ||
e69e7fe5 EVH |
96 | if (result < 0) { |
97 | v9fs_put_idpool(newfid, &v9ses->fidpool); | |
98 | dprintk(DEBUG_ERROR, "rewalk didn't work\n"); | |
99 | return -EBADF; | |
100 | } | |
101 | ||
0b8dd177 LI |
102 | fid->fid = newfid; |
103 | v9fid = fid; | |
e69e7fe5 EVH |
104 | /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */ |
105 | /* translate open mode appropriately */ | |
106 | open_mode = file->f_flags & 0x3; | |
107 | ||
108 | if (file->f_flags & O_EXCL) | |
109 | open_mode |= V9FS_OEXCL; | |
110 | ||
111 | if (v9ses->extended) { | |
112 | if (file->f_flags & O_TRUNC) | |
113 | open_mode |= V9FS_OTRUNC; | |
114 | ||
115 | if (file->f_flags & O_APPEND) | |
116 | open_mode |= V9FS_OAPPEND; | |
117 | } | |
118 | ||
119 | result = v9fs_t_open(v9ses, newfid, open_mode, &fcall); | |
120 | if (result < 0) { | |
121 | dprintk(DEBUG_ERROR, | |
122 | "open failed, open_mode 0x%x: %s\n", open_mode, | |
123 | FCALL_ERROR(fcall)); | |
124 | kfree(fcall); | |
125 | return result; | |
126 | } | |
127 | ||
128 | iounit = fcall->params.ropen.iounit; | |
129 | kfree(fcall); | |
0b8dd177 LI |
130 | } else { |
131 | /* create case */ | |
132 | newfid = v9fid->fid; | |
133 | iounit = v9fid->iounit; | |
134 | v9fid->fidcreate = 0; | |
e69e7fe5 EVH |
135 | } |
136 | ||
e69e7fe5 EVH |
137 | file->private_data = v9fid; |
138 | ||
139 | v9fid->rdir_pos = 0; | |
140 | v9fid->rdir_fcall = NULL; | |
141 | v9fid->fidopen = 1; | |
142 | v9fid->filp = file; | |
143 | v9fid->iounit = iounit; | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | /** | |
149 | * v9fs_file_lock - lock a file (or directory) | |
150 | * @inode: inode to be opened | |
151 | * @file: file being opened | |
152 | * | |
153 | * XXX - this looks like a local only lock, we should extend into 9P | |
154 | * by using open exclusive | |
155 | */ | |
156 | ||
157 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
158 | { | |
159 | int res = 0; | |
160 | struct inode *inode = filp->f_dentry->d_inode; | |
161 | ||
162 | dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); | |
163 | ||
164 | /* No mandatory locks */ | |
165 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
166 | return -ENOLCK; | |
167 | ||
168 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
169 | filemap_fdatawrite(inode->i_mapping); | |
170 | filemap_fdatawait(inode->i_mapping); | |
171 | invalidate_inode_pages(&inode->i_data); | |
172 | } | |
173 | ||
174 | return res; | |
175 | } | |
176 | ||
177 | /** | |
19cba8ab | 178 | * v9fs_file_read - read from a file |
e69e7fe5 EVH |
179 | * @filep: file pointer to read |
180 | * @data: data buffer to read data into | |
181 | * @count: size of buffer | |
182 | * @offset: offset at which to read data | |
183 | * | |
184 | */ | |
e69e7fe5 | 185 | static ssize_t |
19cba8ab LI |
186 | v9fs_file_read(struct file *filp, char __user * data, size_t count, |
187 | loff_t * offset) | |
e69e7fe5 EVH |
188 | { |
189 | struct inode *inode = filp->f_dentry->d_inode; | |
190 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
191 | struct v9fs_fid *v9f = filp->private_data; | |
192 | struct v9fs_fcall *fcall = NULL; | |
193 | int fid = v9f->fid; | |
194 | int rsize = 0; | |
195 | int result = 0; | |
196 | int total = 0; | |
19cba8ab | 197 | int n; |
e69e7fe5 EVH |
198 | |
199 | dprintk(DEBUG_VFS, "\n"); | |
200 | ||
201 | rsize = v9ses->maxdata - V9FS_IOHDRSZ; | |
202 | if (v9f->iounit != 0 && rsize > v9f->iounit) | |
203 | rsize = v9f->iounit; | |
204 | ||
205 | do { | |
206 | if (count < rsize) | |
207 | rsize = count; | |
208 | ||
209 | result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall); | |
210 | ||
211 | if (result < 0) { | |
212 | printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n", | |
213 | result); | |
214 | ||
215 | kfree(fcall); | |
216 | return total; | |
217 | } else | |
218 | *offset += result; | |
219 | ||
19cba8ab LI |
220 | n = copy_to_user(data, fcall->params.rread.data, result); |
221 | if (n) { | |
222 | dprintk(DEBUG_ERROR, "Problem copying to user %d\n", n); | |
223 | kfree(fcall); | |
224 | return -EFAULT; | |
225 | } | |
226 | ||
e69e7fe5 | 227 | count -= result; |
19cba8ab | 228 | data += result; |
e69e7fe5 EVH |
229 | total += result; |
230 | ||
231 | kfree(fcall); | |
232 | ||
233 | if (result < rsize) | |
234 | break; | |
235 | } while (count); | |
236 | ||
237 | return total; | |
238 | } | |
239 | ||
240 | /** | |
19cba8ab | 241 | * v9fs_file_write - write to a file |
e69e7fe5 EVH |
242 | * @filep: file pointer to write |
243 | * @data: data buffer to write data from | |
244 | * @count: size of buffer | |
245 | * @offset: offset at which to write data | |
246 | * | |
247 | */ | |
248 | ||
249 | static ssize_t | |
19cba8ab LI |
250 | v9fs_file_write(struct file *filp, const char __user * data, |
251 | size_t count, loff_t * offset) | |
e69e7fe5 EVH |
252 | { |
253 | struct inode *inode = filp->f_dentry->d_inode; | |
254 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
255 | struct v9fs_fid *v9fid = filp->private_data; | |
256 | struct v9fs_fcall *fcall; | |
257 | int fid = v9fid->fid; | |
258 | int result = -EIO; | |
259 | int rsize = 0; | |
260 | int total = 0; | |
19cba8ab | 261 | char *buf; |
e69e7fe5 | 262 | |
19cba8ab | 263 | dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count, |
e69e7fe5 EVH |
264 | (int)*offset); |
265 | rsize = v9ses->maxdata - V9FS_IOHDRSZ; | |
266 | if (v9fid->iounit != 0 && rsize > v9fid->iounit) | |
267 | rsize = v9fid->iounit; | |
268 | ||
19cba8ab LI |
269 | buf = kmalloc(v9ses->maxdata - V9FS_IOHDRSZ, GFP_KERNEL); |
270 | if (!buf) | |
271 | return -ENOMEM; | |
e69e7fe5 EVH |
272 | |
273 | do { | |
274 | if (count < rsize) | |
275 | rsize = count; | |
276 | ||
19cba8ab LI |
277 | result = copy_from_user(buf, data, rsize); |
278 | if (result) { | |
279 | dprintk(DEBUG_ERROR, "Problem copying from user\n"); | |
280 | kfree(buf); | |
281 | return -EFAULT; | |
282 | } | |
283 | ||
284 | dump_data(buf, rsize); | |
285 | result = v9fs_t_write(v9ses, fid, *offset, rsize, buf, &fcall); | |
e69e7fe5 EVH |
286 | if (result < 0) { |
287 | eprintk(KERN_ERR, "error while writing: %s(%d)\n", | |
288 | FCALL_ERROR(fcall), result); | |
289 | kfree(fcall); | |
19cba8ab | 290 | kfree(buf); |
e69e7fe5 EVH |
291 | return result; |
292 | } else | |
293 | *offset += result; | |
294 | ||
295 | kfree(fcall); | |
19cba8ab | 296 | fcall = NULL; |
e69e7fe5 EVH |
297 | |
298 | if (result != rsize) { | |
299 | eprintk(KERN_ERR, | |
300 | "short write: v9fs_t_write returned %d\n", | |
301 | result); | |
302 | break; | |
303 | } | |
304 | ||
305 | count -= result; | |
19cba8ab | 306 | data += result; |
e69e7fe5 EVH |
307 | total += result; |
308 | } while (count); | |
309 | ||
19cba8ab | 310 | kfree(buf); |
e69e7fe5 EVH |
311 | return total; |
312 | } | |
313 | ||
e69e7fe5 EVH |
314 | struct file_operations v9fs_file_operations = { |
315 | .llseek = generic_file_llseek, | |
316 | .read = v9fs_file_read, | |
317 | .write = v9fs_file_write, | |
318 | .open = v9fs_file_open, | |
319 | .release = v9fs_dir_release, | |
320 | .lock = v9fs_file_lock, | |
321 | }; |