Commit | Line | Data |
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e5e5558e MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
3 | Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu> | |
4 | ||
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/file.h> | |
13 | #include <linux/gfp.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/namei.h> | |
16 | ||
17 | static inline unsigned long time_to_jiffies(unsigned long sec, | |
18 | unsigned long nsec) | |
19 | { | |
20 | struct timespec ts = {sec, nsec}; | |
21 | return jiffies + timespec_to_jiffies(&ts); | |
22 | } | |
23 | ||
24 | static void fuse_lookup_init(struct fuse_req *req, struct inode *dir, | |
25 | struct dentry *entry, | |
26 | struct fuse_entry_out *outarg) | |
27 | { | |
28 | req->in.h.opcode = FUSE_LOOKUP; | |
29 | req->in.h.nodeid = get_node_id(dir); | |
30 | req->inode = dir; | |
31 | req->in.numargs = 1; | |
32 | req->in.args[0].size = entry->d_name.len + 1; | |
33 | req->in.args[0].value = entry->d_name.name; | |
34 | req->out.numargs = 1; | |
35 | req->out.args[0].size = sizeof(struct fuse_entry_out); | |
36 | req->out.args[0].value = outarg; | |
37 | } | |
38 | ||
39 | static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) | |
40 | { | |
41 | if (!entry->d_inode || is_bad_inode(entry->d_inode)) | |
42 | return 0; | |
43 | else if (time_after(jiffies, entry->d_time)) { | |
44 | int err; | |
e5e5558e MS |
45 | struct fuse_entry_out outarg; |
46 | struct inode *inode = entry->d_inode; | |
47 | struct fuse_inode *fi = get_fuse_inode(inode); | |
48 | struct fuse_conn *fc = get_fuse_conn(inode); | |
49 | struct fuse_req *req = fuse_get_request_nonint(fc); | |
50 | if (!req) | |
51 | return 0; | |
52 | ||
53 | fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg); | |
54 | request_send_nonint(fc, req); | |
e5e5558e | 55 | err = req->out.h.error; |
9e6268db MS |
56 | if (!err) { |
57 | if (outarg.nodeid != get_node_id(inode)) { | |
58 | fuse_send_forget(fc, req, outarg.nodeid, 1); | |
59 | return 0; | |
60 | } | |
61 | fi->nlookup ++; | |
62 | } | |
e5e5558e | 63 | fuse_put_request(fc, req); |
9e6268db | 64 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
65 | return 0; |
66 | ||
67 | fuse_change_attributes(inode, &outarg.attr); | |
e5e5558e MS |
68 | entry->d_time = time_to_jiffies(outarg.entry_valid, |
69 | outarg.entry_valid_nsec); | |
70 | fi->i_time = time_to_jiffies(outarg.attr_valid, | |
71 | outarg.attr_valid_nsec); | |
72 | } | |
73 | return 1; | |
74 | } | |
75 | ||
76 | static struct dentry_operations fuse_dentry_operations = { | |
77 | .d_revalidate = fuse_dentry_revalidate, | |
78 | }; | |
79 | ||
80 | static int fuse_lookup_iget(struct inode *dir, struct dentry *entry, | |
81 | struct inode **inodep) | |
82 | { | |
83 | int err; | |
e5e5558e MS |
84 | struct fuse_entry_out outarg; |
85 | struct inode *inode = NULL; | |
86 | struct fuse_conn *fc = get_fuse_conn(dir); | |
87 | struct fuse_req *req; | |
88 | ||
89 | if (entry->d_name.len > FUSE_NAME_MAX) | |
90 | return -ENAMETOOLONG; | |
91 | ||
92 | req = fuse_get_request(fc); | |
93 | if (!req) | |
94 | return -ERESTARTNOINTR; | |
95 | ||
96 | fuse_lookup_init(req, dir, entry, &outarg); | |
97 | request_send(fc, req); | |
e5e5558e MS |
98 | err = req->out.h.error; |
99 | if (!err) { | |
100 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, | |
9e6268db | 101 | &outarg.attr); |
e5e5558e | 102 | if (!inode) { |
9e6268db | 103 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
e5e5558e MS |
104 | return -ENOMEM; |
105 | } | |
106 | } | |
107 | fuse_put_request(fc, req); | |
108 | if (err && err != -ENOENT) | |
109 | return err; | |
110 | ||
111 | if (inode) { | |
112 | struct fuse_inode *fi = get_fuse_inode(inode); | |
113 | entry->d_time = time_to_jiffies(outarg.entry_valid, | |
114 | outarg.entry_valid_nsec); | |
115 | fi->i_time = time_to_jiffies(outarg.attr_valid, | |
116 | outarg.attr_valid_nsec); | |
117 | } | |
118 | ||
119 | entry->d_op = &fuse_dentry_operations; | |
120 | *inodep = inode; | |
121 | return 0; | |
122 | } | |
123 | ||
9e6268db MS |
124 | void fuse_invalidate_attr(struct inode *inode) |
125 | { | |
126 | get_fuse_inode(inode)->i_time = jiffies - 1; | |
127 | } | |
128 | ||
129 | static void fuse_invalidate_entry(struct dentry *entry) | |
130 | { | |
131 | d_invalidate(entry); | |
132 | entry->d_time = jiffies - 1; | |
133 | } | |
134 | ||
135 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, | |
136 | struct inode *dir, struct dentry *entry, | |
137 | int mode) | |
138 | { | |
139 | struct fuse_entry_out outarg; | |
140 | struct inode *inode; | |
141 | struct fuse_inode *fi; | |
142 | int err; | |
143 | ||
144 | req->in.h.nodeid = get_node_id(dir); | |
145 | req->inode = dir; | |
146 | req->out.numargs = 1; | |
147 | req->out.args[0].size = sizeof(outarg); | |
148 | req->out.args[0].value = &outarg; | |
149 | request_send(fc, req); | |
150 | err = req->out.h.error; | |
151 | if (err) { | |
152 | fuse_put_request(fc, req); | |
153 | return err; | |
154 | } | |
155 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, | |
156 | &outarg.attr); | |
157 | if (!inode) { | |
158 | fuse_send_forget(fc, req, outarg.nodeid, 1); | |
159 | return -ENOMEM; | |
160 | } | |
161 | fuse_put_request(fc, req); | |
162 | ||
163 | /* Don't allow userspace to do really stupid things... */ | |
164 | if ((inode->i_mode ^ mode) & S_IFMT) { | |
165 | iput(inode); | |
166 | return -EIO; | |
167 | } | |
168 | ||
169 | entry->d_time = time_to_jiffies(outarg.entry_valid, | |
170 | outarg.entry_valid_nsec); | |
171 | ||
172 | fi = get_fuse_inode(inode); | |
173 | fi->i_time = time_to_jiffies(outarg.attr_valid, | |
174 | outarg.attr_valid_nsec); | |
175 | ||
176 | d_instantiate(entry, inode); | |
177 | fuse_invalidate_attr(dir); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
182 | dev_t rdev) | |
183 | { | |
184 | struct fuse_mknod_in inarg; | |
185 | struct fuse_conn *fc = get_fuse_conn(dir); | |
186 | struct fuse_req *req = fuse_get_request(fc); | |
187 | if (!req) | |
188 | return -ERESTARTNOINTR; | |
189 | ||
190 | memset(&inarg, 0, sizeof(inarg)); | |
191 | inarg.mode = mode; | |
192 | inarg.rdev = new_encode_dev(rdev); | |
193 | req->in.h.opcode = FUSE_MKNOD; | |
194 | req->in.numargs = 2; | |
195 | req->in.args[0].size = sizeof(inarg); | |
196 | req->in.args[0].value = &inarg; | |
197 | req->in.args[1].size = entry->d_name.len + 1; | |
198 | req->in.args[1].value = entry->d_name.name; | |
199 | return create_new_entry(fc, req, dir, entry, mode); | |
200 | } | |
201 | ||
202 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
203 | struct nameidata *nd) | |
204 | { | |
205 | return fuse_mknod(dir, entry, mode, 0); | |
206 | } | |
207 | ||
208 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
209 | { | |
210 | struct fuse_mkdir_in inarg; | |
211 | struct fuse_conn *fc = get_fuse_conn(dir); | |
212 | struct fuse_req *req = fuse_get_request(fc); | |
213 | if (!req) | |
214 | return -ERESTARTNOINTR; | |
215 | ||
216 | memset(&inarg, 0, sizeof(inarg)); | |
217 | inarg.mode = mode; | |
218 | req->in.h.opcode = FUSE_MKDIR; | |
219 | req->in.numargs = 2; | |
220 | req->in.args[0].size = sizeof(inarg); | |
221 | req->in.args[0].value = &inarg; | |
222 | req->in.args[1].size = entry->d_name.len + 1; | |
223 | req->in.args[1].value = entry->d_name.name; | |
224 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
225 | } | |
226 | ||
227 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
228 | const char *link) | |
229 | { | |
230 | struct fuse_conn *fc = get_fuse_conn(dir); | |
231 | unsigned len = strlen(link) + 1; | |
232 | struct fuse_req *req; | |
233 | ||
234 | if (len > FUSE_SYMLINK_MAX) | |
235 | return -ENAMETOOLONG; | |
236 | ||
237 | req = fuse_get_request(fc); | |
238 | if (!req) | |
239 | return -ERESTARTNOINTR; | |
240 | ||
241 | req->in.h.opcode = FUSE_SYMLINK; | |
242 | req->in.numargs = 2; | |
243 | req->in.args[0].size = entry->d_name.len + 1; | |
244 | req->in.args[0].value = entry->d_name.name; | |
245 | req->in.args[1].size = len; | |
246 | req->in.args[1].value = link; | |
247 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
248 | } | |
249 | ||
250 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
251 | { | |
252 | int err; | |
253 | struct fuse_conn *fc = get_fuse_conn(dir); | |
254 | struct fuse_req *req = fuse_get_request(fc); | |
255 | if (!req) | |
256 | return -ERESTARTNOINTR; | |
257 | ||
258 | req->in.h.opcode = FUSE_UNLINK; | |
259 | req->in.h.nodeid = get_node_id(dir); | |
260 | req->inode = dir; | |
261 | req->in.numargs = 1; | |
262 | req->in.args[0].size = entry->d_name.len + 1; | |
263 | req->in.args[0].value = entry->d_name.name; | |
264 | request_send(fc, req); | |
265 | err = req->out.h.error; | |
266 | fuse_put_request(fc, req); | |
267 | if (!err) { | |
268 | struct inode *inode = entry->d_inode; | |
269 | ||
270 | /* Set nlink to zero so the inode can be cleared, if | |
271 | the inode does have more links this will be | |
272 | discovered at the next lookup/getattr */ | |
273 | inode->i_nlink = 0; | |
274 | fuse_invalidate_attr(inode); | |
275 | fuse_invalidate_attr(dir); | |
276 | } else if (err == -EINTR) | |
277 | fuse_invalidate_entry(entry); | |
278 | return err; | |
279 | } | |
280 | ||
281 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
282 | { | |
283 | int err; | |
284 | struct fuse_conn *fc = get_fuse_conn(dir); | |
285 | struct fuse_req *req = fuse_get_request(fc); | |
286 | if (!req) | |
287 | return -ERESTARTNOINTR; | |
288 | ||
289 | req->in.h.opcode = FUSE_RMDIR; | |
290 | req->in.h.nodeid = get_node_id(dir); | |
291 | req->inode = dir; | |
292 | req->in.numargs = 1; | |
293 | req->in.args[0].size = entry->d_name.len + 1; | |
294 | req->in.args[0].value = entry->d_name.name; | |
295 | request_send(fc, req); | |
296 | err = req->out.h.error; | |
297 | fuse_put_request(fc, req); | |
298 | if (!err) { | |
299 | entry->d_inode->i_nlink = 0; | |
300 | fuse_invalidate_attr(dir); | |
301 | } else if (err == -EINTR) | |
302 | fuse_invalidate_entry(entry); | |
303 | return err; | |
304 | } | |
305 | ||
306 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
307 | struct inode *newdir, struct dentry *newent) | |
308 | { | |
309 | int err; | |
310 | struct fuse_rename_in inarg; | |
311 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
312 | struct fuse_req *req = fuse_get_request(fc); | |
313 | if (!req) | |
314 | return -ERESTARTNOINTR; | |
315 | ||
316 | memset(&inarg, 0, sizeof(inarg)); | |
317 | inarg.newdir = get_node_id(newdir); | |
318 | req->in.h.opcode = FUSE_RENAME; | |
319 | req->in.h.nodeid = get_node_id(olddir); | |
320 | req->inode = olddir; | |
321 | req->inode2 = newdir; | |
322 | req->in.numargs = 3; | |
323 | req->in.args[0].size = sizeof(inarg); | |
324 | req->in.args[0].value = &inarg; | |
325 | req->in.args[1].size = oldent->d_name.len + 1; | |
326 | req->in.args[1].value = oldent->d_name.name; | |
327 | req->in.args[2].size = newent->d_name.len + 1; | |
328 | req->in.args[2].value = newent->d_name.name; | |
329 | request_send(fc, req); | |
330 | err = req->out.h.error; | |
331 | fuse_put_request(fc, req); | |
332 | if (!err) { | |
333 | fuse_invalidate_attr(olddir); | |
334 | if (olddir != newdir) | |
335 | fuse_invalidate_attr(newdir); | |
336 | } else if (err == -EINTR) { | |
337 | /* If request was interrupted, DEITY only knows if the | |
338 | rename actually took place. If the invalidation | |
339 | fails (e.g. some process has CWD under the renamed | |
340 | directory), then there can be inconsistency between | |
341 | the dcache and the real filesystem. Tough luck. */ | |
342 | fuse_invalidate_entry(oldent); | |
343 | if (newent->d_inode) | |
344 | fuse_invalidate_entry(newent); | |
345 | } | |
346 | ||
347 | return err; | |
348 | } | |
349 | ||
350 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
351 | struct dentry *newent) | |
352 | { | |
353 | int err; | |
354 | struct fuse_link_in inarg; | |
355 | struct inode *inode = entry->d_inode; | |
356 | struct fuse_conn *fc = get_fuse_conn(inode); | |
357 | struct fuse_req *req = fuse_get_request(fc); | |
358 | if (!req) | |
359 | return -ERESTARTNOINTR; | |
360 | ||
361 | memset(&inarg, 0, sizeof(inarg)); | |
362 | inarg.oldnodeid = get_node_id(inode); | |
363 | req->in.h.opcode = FUSE_LINK; | |
364 | req->inode2 = inode; | |
365 | req->in.numargs = 2; | |
366 | req->in.args[0].size = sizeof(inarg); | |
367 | req->in.args[0].value = &inarg; | |
368 | req->in.args[1].size = newent->d_name.len + 1; | |
369 | req->in.args[1].value = newent->d_name.name; | |
370 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
371 | /* Contrary to "normal" filesystems it can happen that link | |
372 | makes two "logical" inodes point to the same "physical" | |
373 | inode. We invalidate the attributes of the old one, so it | |
374 | will reflect changes in the backing inode (link count, | |
375 | etc.) | |
376 | */ | |
377 | if (!err || err == -EINTR) | |
378 | fuse_invalidate_attr(inode); | |
379 | return err; | |
380 | } | |
381 | ||
e5e5558e MS |
382 | int fuse_do_getattr(struct inode *inode) |
383 | { | |
384 | int err; | |
385 | struct fuse_attr_out arg; | |
386 | struct fuse_conn *fc = get_fuse_conn(inode); | |
387 | struct fuse_req *req = fuse_get_request(fc); | |
388 | if (!req) | |
389 | return -ERESTARTNOINTR; | |
390 | ||
391 | req->in.h.opcode = FUSE_GETATTR; | |
392 | req->in.h.nodeid = get_node_id(inode); | |
393 | req->inode = inode; | |
394 | req->out.numargs = 1; | |
395 | req->out.args[0].size = sizeof(arg); | |
396 | req->out.args[0].value = &arg; | |
397 | request_send(fc, req); | |
398 | err = req->out.h.error; | |
399 | fuse_put_request(fc, req); | |
400 | if (!err) { | |
401 | if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) { | |
402 | make_bad_inode(inode); | |
403 | err = -EIO; | |
404 | } else { | |
405 | struct fuse_inode *fi = get_fuse_inode(inode); | |
406 | fuse_change_attributes(inode, &arg.attr); | |
407 | fi->i_time = time_to_jiffies(arg.attr_valid, | |
408 | arg.attr_valid_nsec); | |
409 | } | |
410 | } | |
411 | return err; | |
412 | } | |
413 | ||
414 | static int fuse_revalidate(struct dentry *entry) | |
415 | { | |
416 | struct inode *inode = entry->d_inode; | |
417 | struct fuse_inode *fi = get_fuse_inode(inode); | |
418 | struct fuse_conn *fc = get_fuse_conn(inode); | |
419 | ||
420 | if (get_node_id(inode) == FUSE_ROOT_ID) { | |
421 | if (current->fsuid != fc->user_id) | |
422 | return -EACCES; | |
423 | } else if (time_before_eq(jiffies, fi->i_time)) | |
424 | return 0; | |
425 | ||
426 | return fuse_do_getattr(inode); | |
427 | } | |
428 | ||
429 | static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) | |
430 | { | |
431 | struct fuse_conn *fc = get_fuse_conn(inode); | |
432 | ||
433 | if (current->fsuid != fc->user_id) | |
434 | return -EACCES; | |
435 | else { | |
436 | int mode = inode->i_mode; | |
437 | if ((mask & MAY_WRITE) && IS_RDONLY(inode) && | |
438 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) | |
439 | return -EROFS; | |
440 | if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO)) | |
441 | return -EACCES; | |
442 | return 0; | |
443 | } | |
444 | } | |
445 | ||
446 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
447 | void *dstbuf, filldir_t filldir) | |
448 | { | |
449 | while (nbytes >= FUSE_NAME_OFFSET) { | |
450 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
451 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
452 | int over; | |
453 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
454 | return -EIO; | |
455 | if (reclen > nbytes) | |
456 | break; | |
457 | ||
458 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
459 | file->f_pos, dirent->ino, dirent->type); | |
460 | if (over) | |
461 | break; | |
462 | ||
463 | buf += reclen; | |
464 | nbytes -= reclen; | |
465 | file->f_pos = dirent->off; | |
466 | } | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
471 | static int fuse_checkdir(struct file *cfile, struct file *file) | |
472 | { | |
473 | struct inode *inode; | |
474 | if (!cfile) | |
475 | return -EIO; | |
476 | inode = cfile->f_dentry->d_inode; | |
477 | if (!S_ISREG(inode->i_mode)) { | |
478 | fput(cfile); | |
479 | return -EIO; | |
480 | } | |
481 | ||
482 | file->private_data = cfile; | |
483 | return 0; | |
484 | } | |
485 | ||
486 | static int fuse_getdir(struct file *file) | |
487 | { | |
488 | struct inode *inode = file->f_dentry->d_inode; | |
489 | struct fuse_conn *fc = get_fuse_conn(inode); | |
490 | struct fuse_req *req = fuse_get_request(fc); | |
491 | struct fuse_getdir_out_i outarg; | |
492 | int err; | |
493 | ||
494 | if (!req) | |
495 | return -ERESTARTNOINTR; | |
496 | ||
497 | req->in.h.opcode = FUSE_GETDIR; | |
498 | req->in.h.nodeid = get_node_id(inode); | |
499 | req->inode = inode; | |
500 | req->out.numargs = 1; | |
501 | req->out.args[0].size = sizeof(struct fuse_getdir_out); | |
502 | req->out.args[0].value = &outarg; | |
503 | request_send(fc, req); | |
504 | err = req->out.h.error; | |
505 | fuse_put_request(fc, req); | |
506 | if (!err) | |
507 | err = fuse_checkdir(outarg.file, file); | |
508 | return err; | |
509 | } | |
510 | ||
511 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) | |
512 | { | |
513 | struct file *cfile = file->private_data; | |
514 | char *buf; | |
515 | int ret; | |
516 | ||
517 | if (!cfile) { | |
518 | ret = fuse_getdir(file); | |
519 | if (ret) | |
520 | return ret; | |
521 | ||
522 | cfile = file->private_data; | |
523 | } | |
524 | ||
525 | buf = (char *) __get_free_page(GFP_KERNEL); | |
526 | if (!buf) | |
527 | return -ENOMEM; | |
528 | ||
529 | ret = kernel_read(cfile, file->f_pos, buf, PAGE_SIZE); | |
530 | if (ret > 0) | |
531 | ret = parse_dirfile(buf, ret, file, dstbuf, filldir); | |
532 | ||
533 | free_page((unsigned long) buf); | |
534 | return ret; | |
535 | } | |
536 | ||
537 | static char *read_link(struct dentry *dentry) | |
538 | { | |
539 | struct inode *inode = dentry->d_inode; | |
540 | struct fuse_conn *fc = get_fuse_conn(inode); | |
541 | struct fuse_req *req = fuse_get_request(fc); | |
542 | char *link; | |
543 | ||
544 | if (!req) | |
545 | return ERR_PTR(-ERESTARTNOINTR); | |
546 | ||
547 | link = (char *) __get_free_page(GFP_KERNEL); | |
548 | if (!link) { | |
549 | link = ERR_PTR(-ENOMEM); | |
550 | goto out; | |
551 | } | |
552 | req->in.h.opcode = FUSE_READLINK; | |
553 | req->in.h.nodeid = get_node_id(inode); | |
554 | req->inode = inode; | |
555 | req->out.argvar = 1; | |
556 | req->out.numargs = 1; | |
557 | req->out.args[0].size = PAGE_SIZE - 1; | |
558 | req->out.args[0].value = link; | |
559 | request_send(fc, req); | |
560 | if (req->out.h.error) { | |
561 | free_page((unsigned long) link); | |
562 | link = ERR_PTR(req->out.h.error); | |
563 | } else | |
564 | link[req->out.args[0].size] = '\0'; | |
565 | out: | |
566 | fuse_put_request(fc, req); | |
567 | return link; | |
568 | } | |
569 | ||
570 | static void free_link(char *link) | |
571 | { | |
572 | if (!IS_ERR(link)) | |
573 | free_page((unsigned long) link); | |
574 | } | |
575 | ||
576 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
577 | { | |
578 | nd_set_link(nd, read_link(dentry)); | |
579 | return NULL; | |
580 | } | |
581 | ||
582 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
583 | { | |
584 | free_link(nd_get_link(nd)); | |
585 | } | |
586 | ||
587 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
588 | { | |
589 | file->private_data = NULL; | |
590 | return 0; | |
591 | } | |
592 | ||
593 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
594 | { | |
595 | struct file *cfile = file->private_data; | |
596 | ||
597 | if (cfile) | |
598 | fput(cfile); | |
599 | ||
600 | return 0; | |
601 | } | |
602 | ||
9e6268db MS |
603 | static unsigned iattr_to_fattr(struct iattr *iattr, struct fuse_attr *fattr) |
604 | { | |
605 | unsigned ivalid = iattr->ia_valid; | |
606 | unsigned fvalid = 0; | |
607 | ||
608 | memset(fattr, 0, sizeof(*fattr)); | |
609 | ||
610 | if (ivalid & ATTR_MODE) | |
611 | fvalid |= FATTR_MODE, fattr->mode = iattr->ia_mode; | |
612 | if (ivalid & ATTR_UID) | |
613 | fvalid |= FATTR_UID, fattr->uid = iattr->ia_uid; | |
614 | if (ivalid & ATTR_GID) | |
615 | fvalid |= FATTR_GID, fattr->gid = iattr->ia_gid; | |
616 | if (ivalid & ATTR_SIZE) | |
617 | fvalid |= FATTR_SIZE, fattr->size = iattr->ia_size; | |
618 | /* You can only _set_ these together (they may change by themselves) */ | |
619 | if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { | |
620 | fvalid |= FATTR_ATIME | FATTR_MTIME; | |
621 | fattr->atime = iattr->ia_atime.tv_sec; | |
622 | fattr->mtime = iattr->ia_mtime.tv_sec; | |
623 | } | |
624 | ||
625 | return fvalid; | |
626 | } | |
627 | ||
628 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) | |
629 | { | |
630 | struct inode *inode = entry->d_inode; | |
631 | struct fuse_conn *fc = get_fuse_conn(inode); | |
632 | struct fuse_inode *fi = get_fuse_inode(inode); | |
633 | struct fuse_req *req; | |
634 | struct fuse_setattr_in inarg; | |
635 | struct fuse_attr_out outarg; | |
636 | int err; | |
637 | int is_truncate = 0; | |
638 | ||
639 | if (attr->ia_valid & ATTR_SIZE) { | |
640 | unsigned long limit; | |
641 | is_truncate = 1; | |
642 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; | |
643 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { | |
644 | send_sig(SIGXFSZ, current, 0); | |
645 | return -EFBIG; | |
646 | } | |
647 | } | |
648 | ||
649 | req = fuse_get_request(fc); | |
650 | if (!req) | |
651 | return -ERESTARTNOINTR; | |
652 | ||
653 | memset(&inarg, 0, sizeof(inarg)); | |
654 | inarg.valid = iattr_to_fattr(attr, &inarg.attr); | |
655 | req->in.h.opcode = FUSE_SETATTR; | |
656 | req->in.h.nodeid = get_node_id(inode); | |
657 | req->inode = inode; | |
658 | req->in.numargs = 1; | |
659 | req->in.args[0].size = sizeof(inarg); | |
660 | req->in.args[0].value = &inarg; | |
661 | req->out.numargs = 1; | |
662 | req->out.args[0].size = sizeof(outarg); | |
663 | req->out.args[0].value = &outarg; | |
664 | request_send(fc, req); | |
665 | err = req->out.h.error; | |
666 | fuse_put_request(fc, req); | |
667 | if (!err) { | |
668 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
669 | make_bad_inode(inode); | |
670 | err = -EIO; | |
671 | } else { | |
672 | if (is_truncate) { | |
673 | loff_t origsize = i_size_read(inode); | |
674 | i_size_write(inode, outarg.attr.size); | |
675 | if (origsize > outarg.attr.size) | |
676 | vmtruncate(inode, outarg.attr.size); | |
677 | } | |
678 | fuse_change_attributes(inode, &outarg.attr); | |
679 | fi->i_time = time_to_jiffies(outarg.attr_valid, | |
680 | outarg.attr_valid_nsec); | |
681 | } | |
682 | } else if (err == -EINTR) | |
683 | fuse_invalidate_attr(inode); | |
684 | ||
685 | return err; | |
686 | } | |
687 | ||
e5e5558e MS |
688 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
689 | struct kstat *stat) | |
690 | { | |
691 | struct inode *inode = entry->d_inode; | |
692 | int err = fuse_revalidate(entry); | |
693 | if (!err) | |
694 | generic_fillattr(inode, stat); | |
695 | ||
696 | return err; | |
697 | } | |
698 | ||
699 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
700 | struct nameidata *nd) | |
701 | { | |
702 | struct inode *inode; | |
703 | int err = fuse_lookup_iget(dir, entry, &inode); | |
704 | if (err) | |
705 | return ERR_PTR(err); | |
706 | if (inode && S_ISDIR(inode->i_mode)) { | |
707 | /* Don't allow creating an alias to a directory */ | |
708 | struct dentry *alias = d_find_alias(inode); | |
709 | if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) { | |
710 | dput(alias); | |
711 | iput(inode); | |
712 | return ERR_PTR(-EIO); | |
713 | } | |
714 | } | |
715 | return d_splice_alias(inode, entry); | |
716 | } | |
717 | ||
718 | static struct inode_operations fuse_dir_inode_operations = { | |
719 | .lookup = fuse_lookup, | |
9e6268db MS |
720 | .mkdir = fuse_mkdir, |
721 | .symlink = fuse_symlink, | |
722 | .unlink = fuse_unlink, | |
723 | .rmdir = fuse_rmdir, | |
724 | .rename = fuse_rename, | |
725 | .link = fuse_link, | |
726 | .setattr = fuse_setattr, | |
727 | .create = fuse_create, | |
728 | .mknod = fuse_mknod, | |
e5e5558e MS |
729 | .permission = fuse_permission, |
730 | .getattr = fuse_getattr, | |
731 | }; | |
732 | ||
733 | static struct file_operations fuse_dir_operations = { | |
b6aeaded | 734 | .llseek = generic_file_llseek, |
e5e5558e MS |
735 | .read = generic_read_dir, |
736 | .readdir = fuse_readdir, | |
737 | .open = fuse_dir_open, | |
738 | .release = fuse_dir_release, | |
739 | }; | |
740 | ||
741 | static struct inode_operations fuse_common_inode_operations = { | |
9e6268db | 742 | .setattr = fuse_setattr, |
e5e5558e MS |
743 | .permission = fuse_permission, |
744 | .getattr = fuse_getattr, | |
745 | }; | |
746 | ||
747 | static struct inode_operations fuse_symlink_inode_operations = { | |
9e6268db | 748 | .setattr = fuse_setattr, |
e5e5558e MS |
749 | .follow_link = fuse_follow_link, |
750 | .put_link = fuse_put_link, | |
751 | .readlink = generic_readlink, | |
752 | .getattr = fuse_getattr, | |
753 | }; | |
754 | ||
755 | void fuse_init_common(struct inode *inode) | |
756 | { | |
757 | inode->i_op = &fuse_common_inode_operations; | |
758 | } | |
759 | ||
760 | void fuse_init_dir(struct inode *inode) | |
761 | { | |
762 | inode->i_op = &fuse_dir_inode_operations; | |
763 | inode->i_fop = &fuse_dir_operations; | |
764 | } | |
765 | ||
766 | void fuse_init_symlink(struct inode *inode) | |
767 | { | |
768 | inode->i_op = &fuse_symlink_inode_operations; | |
769 | } |