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