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1 | /* | |
2 | FUSE: Filesystem in Userspace | |
3 | Copyright (C) 2001-2006 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 | #if BITS_PER_LONG >= 64 | |
18 | static inline void fuse_dentry_settime(struct dentry *entry, u64 time) | |
19 | { | |
20 | entry->d_time = time; | |
21 | } | |
22 | ||
23 | static inline u64 fuse_dentry_time(struct dentry *entry) | |
24 | { | |
25 | return entry->d_time; | |
26 | } | |
27 | #else | |
28 | /* | |
29 | * On 32 bit archs store the high 32 bits of time in d_fsdata | |
30 | */ | |
31 | static void fuse_dentry_settime(struct dentry *entry, u64 time) | |
32 | { | |
33 | entry->d_time = time; | |
34 | entry->d_fsdata = (void *) (unsigned long) (time >> 32); | |
35 | } | |
36 | ||
37 | static u64 fuse_dentry_time(struct dentry *entry) | |
38 | { | |
39 | return (u64) entry->d_time + | |
40 | ((u64) (unsigned long) entry->d_fsdata << 32); | |
41 | } | |
42 | #endif | |
43 | ||
44 | /* | |
45 | * FUSE caches dentries and attributes with separate timeout. The | |
46 | * time in jiffies until the dentry/attributes are valid is stored in | |
47 | * dentry->d_time and fuse_inode->i_time respectively. | |
48 | */ | |
49 | ||
50 | /* | |
51 | * Calculate the time in jiffies until a dentry/attributes are valid | |
52 | */ | |
53 | static u64 time_to_jiffies(unsigned long sec, unsigned long nsec) | |
54 | { | |
55 | if (sec || nsec) { | |
56 | struct timespec ts = {sec, nsec}; | |
57 | return get_jiffies_64() + timespec_to_jiffies(&ts); | |
58 | } else | |
59 | return 0; | |
60 | } | |
61 | ||
62 | /* | |
63 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
64 | * replies | |
65 | */ | |
66 | static void fuse_change_timeout(struct dentry *entry, struct fuse_entry_out *o) | |
67 | { | |
68 | fuse_dentry_settime(entry, | |
69 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
70 | if (entry->d_inode) | |
71 | get_fuse_inode(entry->d_inode)->i_time = | |
72 | time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
73 | } | |
74 | ||
75 | /* | |
76 | * Mark the attributes as stale, so that at the next call to | |
77 | * ->getattr() they will be fetched from userspace | |
78 | */ | |
79 | void fuse_invalidate_attr(struct inode *inode) | |
80 | { | |
81 | get_fuse_inode(inode)->i_time = 0; | |
82 | } | |
83 | ||
84 | /* | |
85 | * Just mark the entry as stale, so that a next attempt to look it up | |
86 | * will result in a new lookup call to userspace | |
87 | * | |
88 | * This is called when a dentry is about to become negative and the | |
89 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
90 | * lookup) | |
91 | */ | |
92 | static void fuse_invalidate_entry_cache(struct dentry *entry) | |
93 | { | |
94 | fuse_dentry_settime(entry, 0); | |
95 | } | |
96 | ||
97 | /* | |
98 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
99 | * dentry from the hash | |
100 | */ | |
101 | static void fuse_invalidate_entry(struct dentry *entry) | |
102 | { | |
103 | d_invalidate(entry); | |
104 | fuse_invalidate_entry_cache(entry); | |
105 | } | |
106 | ||
107 | static void fuse_lookup_init(struct fuse_req *req, struct inode *dir, | |
108 | struct dentry *entry, | |
109 | struct fuse_entry_out *outarg) | |
110 | { | |
111 | req->in.h.opcode = FUSE_LOOKUP; | |
112 | req->in.h.nodeid = get_node_id(dir); | |
113 | req->in.numargs = 1; | |
114 | req->in.args[0].size = entry->d_name.len + 1; | |
115 | req->in.args[0].value = entry->d_name.name; | |
116 | req->out.numargs = 1; | |
117 | req->out.args[0].size = sizeof(struct fuse_entry_out); | |
118 | req->out.args[0].value = outarg; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Check whether the dentry is still valid | |
123 | * | |
124 | * If the entry validity timeout has expired and the dentry is | |
125 | * positive, try to redo the lookup. If the lookup results in a | |
126 | * different inode, then let the VFS invalidate the dentry and redo | |
127 | * the lookup once more. If the lookup results in the same inode, | |
128 | * then refresh the attributes, timeouts and mark the dentry valid. | |
129 | */ | |
130 | static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) | |
131 | { | |
132 | struct inode *inode = entry->d_inode; | |
133 | ||
134 | if (inode && is_bad_inode(inode)) | |
135 | return 0; | |
136 | else if (fuse_dentry_time(entry) < get_jiffies_64()) { | |
137 | int err; | |
138 | struct fuse_entry_out outarg; | |
139 | struct fuse_conn *fc; | |
140 | struct fuse_req *req; | |
141 | struct fuse_req *forget_req; | |
142 | struct dentry *parent; | |
143 | ||
144 | /* For negative dentries, always do a fresh lookup */ | |
145 | if (!inode) | |
146 | return 0; | |
147 | ||
148 | fc = get_fuse_conn(inode); | |
149 | req = fuse_get_req(fc); | |
150 | if (IS_ERR(req)) | |
151 | return 0; | |
152 | ||
153 | forget_req = fuse_get_req(fc); | |
154 | if (IS_ERR(forget_req)) { | |
155 | fuse_put_request(fc, req); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | parent = dget_parent(entry); | |
160 | fuse_lookup_init(req, parent->d_inode, entry, &outarg); | |
161 | request_send(fc, req); | |
162 | dput(parent); | |
163 | err = req->out.h.error; | |
164 | fuse_put_request(fc, req); | |
165 | /* Zero nodeid is same as -ENOENT */ | |
166 | if (!err && !outarg.nodeid) | |
167 | err = -ENOENT; | |
168 | if (!err) { | |
169 | struct fuse_inode *fi = get_fuse_inode(inode); | |
170 | if (outarg.nodeid != get_node_id(inode)) { | |
171 | fuse_send_forget(fc, forget_req, | |
172 | outarg.nodeid, 1); | |
173 | return 0; | |
174 | } | |
175 | spin_lock(&fc->lock); | |
176 | fi->nlookup ++; | |
177 | spin_unlock(&fc->lock); | |
178 | } | |
179 | fuse_put_request(fc, forget_req); | |
180 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) | |
181 | return 0; | |
182 | ||
183 | fuse_change_attributes(inode, &outarg.attr); | |
184 | fuse_change_timeout(entry, &outarg); | |
185 | } | |
186 | return 1; | |
187 | } | |
188 | ||
189 | static int invalid_nodeid(u64 nodeid) | |
190 | { | |
191 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
192 | } | |
193 | ||
194 | static struct dentry_operations fuse_dentry_operations = { | |
195 | .d_revalidate = fuse_dentry_revalidate, | |
196 | }; | |
197 | ||
198 | int fuse_valid_type(int m) | |
199 | { | |
200 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
201 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
202 | } | |
203 | ||
204 | /* | |
205 | * Add a directory inode to a dentry, ensuring that no other dentry | |
206 | * refers to this inode. Called with fc->inst_mutex. | |
207 | */ | |
208 | static int fuse_d_add_directory(struct dentry *entry, struct inode *inode) | |
209 | { | |
210 | struct dentry *alias = d_find_alias(inode); | |
211 | if (alias) { | |
212 | /* This tries to shrink the subtree below alias */ | |
213 | fuse_invalidate_entry(alias); | |
214 | dput(alias); | |
215 | if (!list_empty(&inode->i_dentry)) | |
216 | return -EBUSY; | |
217 | } | |
218 | d_add(entry, inode); | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
223 | struct nameidata *nd) | |
224 | { | |
225 | int err; | |
226 | struct fuse_entry_out outarg; | |
227 | struct inode *inode = NULL; | |
228 | struct fuse_conn *fc = get_fuse_conn(dir); | |
229 | struct fuse_req *req; | |
230 | struct fuse_req *forget_req; | |
231 | ||
232 | if (entry->d_name.len > FUSE_NAME_MAX) | |
233 | return ERR_PTR(-ENAMETOOLONG); | |
234 | ||
235 | req = fuse_get_req(fc); | |
236 | if (IS_ERR(req)) | |
237 | return ERR_PTR(PTR_ERR(req)); | |
238 | ||
239 | forget_req = fuse_get_req(fc); | |
240 | if (IS_ERR(forget_req)) { | |
241 | fuse_put_request(fc, req); | |
242 | return ERR_PTR(PTR_ERR(forget_req)); | |
243 | } | |
244 | ||
245 | fuse_lookup_init(req, dir, entry, &outarg); | |
246 | request_send(fc, req); | |
247 | err = req->out.h.error; | |
248 | fuse_put_request(fc, req); | |
249 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ | |
250 | if (!err && outarg.nodeid && | |
251 | (invalid_nodeid(outarg.nodeid) || | |
252 | !fuse_valid_type(outarg.attr.mode))) | |
253 | err = -EIO; | |
254 | if (!err && outarg.nodeid) { | |
255 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, | |
256 | &outarg.attr); | |
257 | if (!inode) { | |
258 | fuse_send_forget(fc, forget_req, outarg.nodeid, 1); | |
259 | return ERR_PTR(-ENOMEM); | |
260 | } | |
261 | } | |
262 | fuse_put_request(fc, forget_req); | |
263 | if (err && err != -ENOENT) | |
264 | return ERR_PTR(err); | |
265 | ||
266 | if (inode && S_ISDIR(inode->i_mode)) { | |
267 | mutex_lock(&fc->inst_mutex); | |
268 | err = fuse_d_add_directory(entry, inode); | |
269 | mutex_unlock(&fc->inst_mutex); | |
270 | if (err) { | |
271 | iput(inode); | |
272 | return ERR_PTR(err); | |
273 | } | |
274 | } else | |
275 | d_add(entry, inode); | |
276 | ||
277 | entry->d_op = &fuse_dentry_operations; | |
278 | if (!err) | |
279 | fuse_change_timeout(entry, &outarg); | |
280 | else | |
281 | fuse_invalidate_entry_cache(entry); | |
282 | return NULL; | |
283 | } | |
284 | ||
285 | /* | |
286 | * Synchronous release for the case when something goes wrong in CREATE_OPEN | |
287 | */ | |
288 | static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff, | |
289 | u64 nodeid, int flags) | |
290 | { | |
291 | fuse_release_fill(ff, nodeid, flags, FUSE_RELEASE); | |
292 | ff->reserved_req->force = 1; | |
293 | request_send(fc, ff->reserved_req); | |
294 | fuse_put_request(fc, ff->reserved_req); | |
295 | kfree(ff); | |
296 | } | |
297 | ||
298 | /* | |
299 | * Atomic create+open operation | |
300 | * | |
301 | * If the filesystem doesn't support this, then fall back to separate | |
302 | * 'mknod' + 'open' requests. | |
303 | */ | |
304 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, | |
305 | struct nameidata *nd) | |
306 | { | |
307 | int err; | |
308 | struct inode *inode; | |
309 | struct fuse_conn *fc = get_fuse_conn(dir); | |
310 | struct fuse_req *req; | |
311 | struct fuse_req *forget_req; | |
312 | struct fuse_open_in inarg; | |
313 | struct fuse_open_out outopen; | |
314 | struct fuse_entry_out outentry; | |
315 | struct fuse_file *ff; | |
316 | struct file *file; | |
317 | int flags = nd->intent.open.flags - 1; | |
318 | ||
319 | if (fc->no_create) | |
320 | return -ENOSYS; | |
321 | ||
322 | forget_req = fuse_get_req(fc); | |
323 | if (IS_ERR(forget_req)) | |
324 | return PTR_ERR(forget_req); | |
325 | ||
326 | req = fuse_get_req(fc); | |
327 | err = PTR_ERR(req); | |
328 | if (IS_ERR(req)) | |
329 | goto out_put_forget_req; | |
330 | ||
331 | err = -ENOMEM; | |
332 | ff = fuse_file_alloc(); | |
333 | if (!ff) | |
334 | goto out_put_request; | |
335 | ||
336 | flags &= ~O_NOCTTY; | |
337 | memset(&inarg, 0, sizeof(inarg)); | |
338 | inarg.flags = flags; | |
339 | inarg.mode = mode; | |
340 | req->in.h.opcode = FUSE_CREATE; | |
341 | req->in.h.nodeid = get_node_id(dir); | |
342 | req->in.numargs = 2; | |
343 | req->in.args[0].size = sizeof(inarg); | |
344 | req->in.args[0].value = &inarg; | |
345 | req->in.args[1].size = entry->d_name.len + 1; | |
346 | req->in.args[1].value = entry->d_name.name; | |
347 | req->out.numargs = 2; | |
348 | req->out.args[0].size = sizeof(outentry); | |
349 | req->out.args[0].value = &outentry; | |
350 | req->out.args[1].size = sizeof(outopen); | |
351 | req->out.args[1].value = &outopen; | |
352 | request_send(fc, req); | |
353 | err = req->out.h.error; | |
354 | if (err) { | |
355 | if (err == -ENOSYS) | |
356 | fc->no_create = 1; | |
357 | goto out_free_ff; | |
358 | } | |
359 | ||
360 | err = -EIO; | |
361 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) | |
362 | goto out_free_ff; | |
363 | ||
364 | fuse_put_request(fc, req); | |
365 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, | |
366 | &outentry.attr); | |
367 | if (!inode) { | |
368 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
369 | ff->fh = outopen.fh; | |
370 | fuse_sync_release(fc, ff, outentry.nodeid, flags); | |
371 | fuse_send_forget(fc, forget_req, outentry.nodeid, 1); | |
372 | return -ENOMEM; | |
373 | } | |
374 | fuse_put_request(fc, forget_req); | |
375 | d_instantiate(entry, inode); | |
376 | fuse_change_timeout(entry, &outentry); | |
377 | file = lookup_instantiate_filp(nd, entry, generic_file_open); | |
378 | if (IS_ERR(file)) { | |
379 | ff->fh = outopen.fh; | |
380 | fuse_sync_release(fc, ff, outentry.nodeid, flags); | |
381 | return PTR_ERR(file); | |
382 | } | |
383 | fuse_finish_open(inode, file, ff, &outopen); | |
384 | return 0; | |
385 | ||
386 | out_free_ff: | |
387 | fuse_file_free(ff); | |
388 | out_put_request: | |
389 | fuse_put_request(fc, req); | |
390 | out_put_forget_req: | |
391 | fuse_put_request(fc, forget_req); | |
392 | return err; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Code shared between mknod, mkdir, symlink and link | |
397 | */ | |
398 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, | |
399 | struct inode *dir, struct dentry *entry, | |
400 | int mode) | |
401 | { | |
402 | struct fuse_entry_out outarg; | |
403 | struct inode *inode; | |
404 | int err; | |
405 | struct fuse_req *forget_req; | |
406 | ||
407 | forget_req = fuse_get_req(fc); | |
408 | if (IS_ERR(forget_req)) { | |
409 | fuse_put_request(fc, req); | |
410 | return PTR_ERR(forget_req); | |
411 | } | |
412 | ||
413 | req->in.h.nodeid = get_node_id(dir); | |
414 | req->out.numargs = 1; | |
415 | req->out.args[0].size = sizeof(outarg); | |
416 | req->out.args[0].value = &outarg; | |
417 | request_send(fc, req); | |
418 | err = req->out.h.error; | |
419 | fuse_put_request(fc, req); | |
420 | if (err) | |
421 | goto out_put_forget_req; | |
422 | ||
423 | err = -EIO; | |
424 | if (invalid_nodeid(outarg.nodeid)) | |
425 | goto out_put_forget_req; | |
426 | ||
427 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
428 | goto out_put_forget_req; | |
429 | ||
430 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, | |
431 | &outarg.attr); | |
432 | if (!inode) { | |
433 | fuse_send_forget(fc, forget_req, outarg.nodeid, 1); | |
434 | return -ENOMEM; | |
435 | } | |
436 | fuse_put_request(fc, forget_req); | |
437 | ||
438 | if (S_ISDIR(inode->i_mode)) { | |
439 | struct dentry *alias; | |
440 | mutex_lock(&fc->inst_mutex); | |
441 | alias = d_find_alias(inode); | |
442 | if (alias) { | |
443 | /* New directory must have moved since mkdir */ | |
444 | mutex_unlock(&fc->inst_mutex); | |
445 | dput(alias); | |
446 | iput(inode); | |
447 | return -EBUSY; | |
448 | } | |
449 | d_instantiate(entry, inode); | |
450 | mutex_unlock(&fc->inst_mutex); | |
451 | } else | |
452 | d_instantiate(entry, inode); | |
453 | ||
454 | fuse_change_timeout(entry, &outarg); | |
455 | fuse_invalidate_attr(dir); | |
456 | return 0; | |
457 | ||
458 | out_put_forget_req: | |
459 | fuse_put_request(fc, forget_req); | |
460 | return err; | |
461 | } | |
462 | ||
463 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
464 | dev_t rdev) | |
465 | { | |
466 | struct fuse_mknod_in inarg; | |
467 | struct fuse_conn *fc = get_fuse_conn(dir); | |
468 | struct fuse_req *req = fuse_get_req(fc); | |
469 | if (IS_ERR(req)) | |
470 | return PTR_ERR(req); | |
471 | ||
472 | memset(&inarg, 0, sizeof(inarg)); | |
473 | inarg.mode = mode; | |
474 | inarg.rdev = new_encode_dev(rdev); | |
475 | req->in.h.opcode = FUSE_MKNOD; | |
476 | req->in.numargs = 2; | |
477 | req->in.args[0].size = sizeof(inarg); | |
478 | req->in.args[0].value = &inarg; | |
479 | req->in.args[1].size = entry->d_name.len + 1; | |
480 | req->in.args[1].value = entry->d_name.name; | |
481 | return create_new_entry(fc, req, dir, entry, mode); | |
482 | } | |
483 | ||
484 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
485 | struct nameidata *nd) | |
486 | { | |
487 | if (nd && (nd->flags & LOOKUP_OPEN)) { | |
488 | int err = fuse_create_open(dir, entry, mode, nd); | |
489 | if (err != -ENOSYS) | |
490 | return err; | |
491 | /* Fall back on mknod */ | |
492 | } | |
493 | return fuse_mknod(dir, entry, mode, 0); | |
494 | } | |
495 | ||
496 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
497 | { | |
498 | struct fuse_mkdir_in inarg; | |
499 | struct fuse_conn *fc = get_fuse_conn(dir); | |
500 | struct fuse_req *req = fuse_get_req(fc); | |
501 | if (IS_ERR(req)) | |
502 | return PTR_ERR(req); | |
503 | ||
504 | memset(&inarg, 0, sizeof(inarg)); | |
505 | inarg.mode = mode; | |
506 | req->in.h.opcode = FUSE_MKDIR; | |
507 | req->in.numargs = 2; | |
508 | req->in.args[0].size = sizeof(inarg); | |
509 | req->in.args[0].value = &inarg; | |
510 | req->in.args[1].size = entry->d_name.len + 1; | |
511 | req->in.args[1].value = entry->d_name.name; | |
512 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
513 | } | |
514 | ||
515 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
516 | const char *link) | |
517 | { | |
518 | struct fuse_conn *fc = get_fuse_conn(dir); | |
519 | unsigned len = strlen(link) + 1; | |
520 | struct fuse_req *req = fuse_get_req(fc); | |
521 | if (IS_ERR(req)) | |
522 | return PTR_ERR(req); | |
523 | ||
524 | req->in.h.opcode = FUSE_SYMLINK; | |
525 | req->in.numargs = 2; | |
526 | req->in.args[0].size = entry->d_name.len + 1; | |
527 | req->in.args[0].value = entry->d_name.name; | |
528 | req->in.args[1].size = len; | |
529 | req->in.args[1].value = link; | |
530 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
531 | } | |
532 | ||
533 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
534 | { | |
535 | int err; | |
536 | struct fuse_conn *fc = get_fuse_conn(dir); | |
537 | struct fuse_req *req = fuse_get_req(fc); | |
538 | if (IS_ERR(req)) | |
539 | return PTR_ERR(req); | |
540 | ||
541 | req->in.h.opcode = FUSE_UNLINK; | |
542 | req->in.h.nodeid = get_node_id(dir); | |
543 | req->in.numargs = 1; | |
544 | req->in.args[0].size = entry->d_name.len + 1; | |
545 | req->in.args[0].value = entry->d_name.name; | |
546 | request_send(fc, req); | |
547 | err = req->out.h.error; | |
548 | fuse_put_request(fc, req); | |
549 | if (!err) { | |
550 | struct inode *inode = entry->d_inode; | |
551 | ||
552 | /* Set nlink to zero so the inode can be cleared, if | |
553 | the inode does have more links this will be | |
554 | discovered at the next lookup/getattr */ | |
555 | clear_nlink(inode); | |
556 | fuse_invalidate_attr(inode); | |
557 | fuse_invalidate_attr(dir); | |
558 | fuse_invalidate_entry_cache(entry); | |
559 | } else if (err == -EINTR) | |
560 | fuse_invalidate_entry(entry); | |
561 | return err; | |
562 | } | |
563 | ||
564 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
565 | { | |
566 | int err; | |
567 | struct fuse_conn *fc = get_fuse_conn(dir); | |
568 | struct fuse_req *req = fuse_get_req(fc); | |
569 | if (IS_ERR(req)) | |
570 | return PTR_ERR(req); | |
571 | ||
572 | req->in.h.opcode = FUSE_RMDIR; | |
573 | req->in.h.nodeid = get_node_id(dir); | |
574 | req->in.numargs = 1; | |
575 | req->in.args[0].size = entry->d_name.len + 1; | |
576 | req->in.args[0].value = entry->d_name.name; | |
577 | request_send(fc, req); | |
578 | err = req->out.h.error; | |
579 | fuse_put_request(fc, req); | |
580 | if (!err) { | |
581 | clear_nlink(entry->d_inode); | |
582 | fuse_invalidate_attr(dir); | |
583 | fuse_invalidate_entry_cache(entry); | |
584 | } else if (err == -EINTR) | |
585 | fuse_invalidate_entry(entry); | |
586 | return err; | |
587 | } | |
588 | ||
589 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
590 | struct inode *newdir, struct dentry *newent) | |
591 | { | |
592 | int err; | |
593 | struct fuse_rename_in inarg; | |
594 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
595 | struct fuse_req *req = fuse_get_req(fc); | |
596 | if (IS_ERR(req)) | |
597 | return PTR_ERR(req); | |
598 | ||
599 | memset(&inarg, 0, sizeof(inarg)); | |
600 | inarg.newdir = get_node_id(newdir); | |
601 | req->in.h.opcode = FUSE_RENAME; | |
602 | req->in.h.nodeid = get_node_id(olddir); | |
603 | req->in.numargs = 3; | |
604 | req->in.args[0].size = sizeof(inarg); | |
605 | req->in.args[0].value = &inarg; | |
606 | req->in.args[1].size = oldent->d_name.len + 1; | |
607 | req->in.args[1].value = oldent->d_name.name; | |
608 | req->in.args[2].size = newent->d_name.len + 1; | |
609 | req->in.args[2].value = newent->d_name.name; | |
610 | request_send(fc, req); | |
611 | err = req->out.h.error; | |
612 | fuse_put_request(fc, req); | |
613 | if (!err) { | |
614 | fuse_invalidate_attr(olddir); | |
615 | if (olddir != newdir) | |
616 | fuse_invalidate_attr(newdir); | |
617 | ||
618 | /* newent will end up negative */ | |
619 | if (newent->d_inode) | |
620 | fuse_invalidate_entry_cache(newent); | |
621 | } else if (err == -EINTR) { | |
622 | /* If request was interrupted, DEITY only knows if the | |
623 | rename actually took place. If the invalidation | |
624 | fails (e.g. some process has CWD under the renamed | |
625 | directory), then there can be inconsistency between | |
626 | the dcache and the real filesystem. Tough luck. */ | |
627 | fuse_invalidate_entry(oldent); | |
628 | if (newent->d_inode) | |
629 | fuse_invalidate_entry(newent); | |
630 | } | |
631 | ||
632 | return err; | |
633 | } | |
634 | ||
635 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
636 | struct dentry *newent) | |
637 | { | |
638 | int err; | |
639 | struct fuse_link_in inarg; | |
640 | struct inode *inode = entry->d_inode; | |
641 | struct fuse_conn *fc = get_fuse_conn(inode); | |
642 | struct fuse_req *req = fuse_get_req(fc); | |
643 | if (IS_ERR(req)) | |
644 | return PTR_ERR(req); | |
645 | ||
646 | memset(&inarg, 0, sizeof(inarg)); | |
647 | inarg.oldnodeid = get_node_id(inode); | |
648 | req->in.h.opcode = FUSE_LINK; | |
649 | req->in.numargs = 2; | |
650 | req->in.args[0].size = sizeof(inarg); | |
651 | req->in.args[0].value = &inarg; | |
652 | req->in.args[1].size = newent->d_name.len + 1; | |
653 | req->in.args[1].value = newent->d_name.name; | |
654 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
655 | /* Contrary to "normal" filesystems it can happen that link | |
656 | makes two "logical" inodes point to the same "physical" | |
657 | inode. We invalidate the attributes of the old one, so it | |
658 | will reflect changes in the backing inode (link count, | |
659 | etc.) | |
660 | */ | |
661 | if (!err || err == -EINTR) | |
662 | fuse_invalidate_attr(inode); | |
663 | return err; | |
664 | } | |
665 | ||
666 | static int fuse_do_getattr(struct inode *inode) | |
667 | { | |
668 | int err; | |
669 | struct fuse_attr_out arg; | |
670 | struct fuse_conn *fc = get_fuse_conn(inode); | |
671 | struct fuse_req *req = fuse_get_req(fc); | |
672 | if (IS_ERR(req)) | |
673 | return PTR_ERR(req); | |
674 | ||
675 | req->in.h.opcode = FUSE_GETATTR; | |
676 | req->in.h.nodeid = get_node_id(inode); | |
677 | req->out.numargs = 1; | |
678 | req->out.args[0].size = sizeof(arg); | |
679 | req->out.args[0].value = &arg; | |
680 | request_send(fc, req); | |
681 | err = req->out.h.error; | |
682 | fuse_put_request(fc, req); | |
683 | if (!err) { | |
684 | if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) { | |
685 | make_bad_inode(inode); | |
686 | err = -EIO; | |
687 | } else { | |
688 | struct fuse_inode *fi = get_fuse_inode(inode); | |
689 | fuse_change_attributes(inode, &arg.attr); | |
690 | fi->i_time = time_to_jiffies(arg.attr_valid, | |
691 | arg.attr_valid_nsec); | |
692 | } | |
693 | } | |
694 | return err; | |
695 | } | |
696 | ||
697 | /* | |
698 | * Check if attributes are still valid, and if not send a GETATTR | |
699 | * request to refresh them. | |
700 | */ | |
701 | static int fuse_refresh_attributes(struct inode *inode) | |
702 | { | |
703 | struct fuse_inode *fi = get_fuse_inode(inode); | |
704 | ||
705 | if (fi->i_time < get_jiffies_64()) | |
706 | return fuse_do_getattr(inode); | |
707 | else | |
708 | return 0; | |
709 | } | |
710 | ||
711 | /* | |
712 | * Calling into a user-controlled filesystem gives the filesystem | |
713 | * daemon ptrace-like capabilities over the requester process. This | |
714 | * means, that the filesystem daemon is able to record the exact | |
715 | * filesystem operations performed, and can also control the behavior | |
716 | * of the requester process in otherwise impossible ways. For example | |
717 | * it can delay the operation for arbitrary length of time allowing | |
718 | * DoS against the requester. | |
719 | * | |
720 | * For this reason only those processes can call into the filesystem, | |
721 | * for which the owner of the mount has ptrace privilege. This | |
722 | * excludes processes started by other users, suid or sgid processes. | |
723 | */ | |
724 | int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) | |
725 | { | |
726 | if (fc->flags & FUSE_ALLOW_OTHER) | |
727 | return 1; | |
728 | ||
729 | if (task->euid == fc->user_id && | |
730 | task->suid == fc->user_id && | |
731 | task->uid == fc->user_id && | |
732 | task->egid == fc->group_id && | |
733 | task->sgid == fc->group_id && | |
734 | task->gid == fc->group_id) | |
735 | return 1; | |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
740 | static int fuse_access(struct inode *inode, int mask) | |
741 | { | |
742 | struct fuse_conn *fc = get_fuse_conn(inode); | |
743 | struct fuse_req *req; | |
744 | struct fuse_access_in inarg; | |
745 | int err; | |
746 | ||
747 | if (fc->no_access) | |
748 | return 0; | |
749 | ||
750 | req = fuse_get_req(fc); | |
751 | if (IS_ERR(req)) | |
752 | return PTR_ERR(req); | |
753 | ||
754 | memset(&inarg, 0, sizeof(inarg)); | |
755 | inarg.mask = mask; | |
756 | req->in.h.opcode = FUSE_ACCESS; | |
757 | req->in.h.nodeid = get_node_id(inode); | |
758 | req->in.numargs = 1; | |
759 | req->in.args[0].size = sizeof(inarg); | |
760 | req->in.args[0].value = &inarg; | |
761 | request_send(fc, req); | |
762 | err = req->out.h.error; | |
763 | fuse_put_request(fc, req); | |
764 | if (err == -ENOSYS) { | |
765 | fc->no_access = 1; | |
766 | err = 0; | |
767 | } | |
768 | return err; | |
769 | } | |
770 | ||
771 | /* | |
772 | * Check permission. The two basic access models of FUSE are: | |
773 | * | |
774 | * 1) Local access checking ('default_permissions' mount option) based | |
775 | * on file mode. This is the plain old disk filesystem permission | |
776 | * modell. | |
777 | * | |
778 | * 2) "Remote" access checking, where server is responsible for | |
779 | * checking permission in each inode operation. An exception to this | |
780 | * is if ->permission() was invoked from sys_access() in which case an | |
781 | * access request is sent. Execute permission is still checked | |
782 | * locally based on file mode. | |
783 | */ | |
784 | static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) | |
785 | { | |
786 | struct fuse_conn *fc = get_fuse_conn(inode); | |
787 | bool refreshed = false; | |
788 | int err = 0; | |
789 | ||
790 | if (!fuse_allow_task(fc, current)) | |
791 | return -EACCES; | |
792 | ||
793 | /* | |
794 | * If attributes are needed, refresh them before proceeding | |
795 | */ | |
796 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || | |
797 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
798 | err = fuse_refresh_attributes(inode); | |
799 | if (err) | |
800 | return err; | |
801 | ||
802 | refreshed = true; | |
803 | } | |
804 | ||
805 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
806 | int err = generic_permission(inode, mask, NULL); | |
807 | ||
808 | /* If permission is denied, try to refresh file | |
809 | attributes. This is also needed, because the root | |
810 | node will at first have no permissions */ | |
811 | if (err == -EACCES && !refreshed) { | |
812 | err = fuse_do_getattr(inode); | |
813 | if (!err) | |
814 | err = generic_permission(inode, mask, NULL); | |
815 | } | |
816 | ||
817 | /* Note: the opposite of the above test does not | |
818 | exist. So if permissions are revoked this won't be | |
819 | noticed immediately, only after the attribute | |
820 | timeout has expired */ | |
821 | } else if (nd && (nd->flags & (LOOKUP_ACCESS | LOOKUP_CHDIR))) { | |
822 | err = fuse_access(inode, mask); | |
823 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
824 | if (!(inode->i_mode & S_IXUGO)) { | |
825 | if (refreshed) | |
826 | return -EACCES; | |
827 | ||
828 | err = fuse_do_getattr(inode); | |
829 | if (!err && !(inode->i_mode & S_IXUGO)) | |
830 | return -EACCES; | |
831 | } | |
832 | } | |
833 | return err; | |
834 | } | |
835 | ||
836 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
837 | void *dstbuf, filldir_t filldir) | |
838 | { | |
839 | while (nbytes >= FUSE_NAME_OFFSET) { | |
840 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
841 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
842 | int over; | |
843 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
844 | return -EIO; | |
845 | if (reclen > nbytes) | |
846 | break; | |
847 | ||
848 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
849 | file->f_pos, dirent->ino, dirent->type); | |
850 | if (over) | |
851 | break; | |
852 | ||
853 | buf += reclen; | |
854 | nbytes -= reclen; | |
855 | file->f_pos = dirent->off; | |
856 | } | |
857 | ||
858 | return 0; | |
859 | } | |
860 | ||
861 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) | |
862 | { | |
863 | int err; | |
864 | size_t nbytes; | |
865 | struct page *page; | |
866 | struct inode *inode = file->f_path.dentry->d_inode; | |
867 | struct fuse_conn *fc = get_fuse_conn(inode); | |
868 | struct fuse_file *ff = file->private_data; | |
869 | struct fuse_req *req; | |
870 | ||
871 | if (is_bad_inode(inode)) | |
872 | return -EIO; | |
873 | ||
874 | req = fuse_get_req(fc); | |
875 | if (IS_ERR(req)) | |
876 | return PTR_ERR(req); | |
877 | ||
878 | page = alloc_page(GFP_KERNEL); | |
879 | if (!page) { | |
880 | fuse_put_request(fc, req); | |
881 | return -ENOMEM; | |
882 | } | |
883 | req->num_pages = 1; | |
884 | req->pages[0] = page; | |
885 | fuse_read_fill(req, ff, inode, file->f_pos, PAGE_SIZE, FUSE_READDIR); | |
886 | request_send(fc, req); | |
887 | nbytes = req->out.args[0].size; | |
888 | err = req->out.h.error; | |
889 | fuse_put_request(fc, req); | |
890 | if (!err) | |
891 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, | |
892 | filldir); | |
893 | ||
894 | __free_page(page); | |
895 | fuse_invalidate_attr(inode); /* atime changed */ | |
896 | return err; | |
897 | } | |
898 | ||
899 | static char *read_link(struct dentry *dentry) | |
900 | { | |
901 | struct inode *inode = dentry->d_inode; | |
902 | struct fuse_conn *fc = get_fuse_conn(inode); | |
903 | struct fuse_req *req = fuse_get_req(fc); | |
904 | char *link; | |
905 | ||
906 | if (IS_ERR(req)) | |
907 | return ERR_PTR(PTR_ERR(req)); | |
908 | ||
909 | link = (char *) __get_free_page(GFP_KERNEL); | |
910 | if (!link) { | |
911 | link = ERR_PTR(-ENOMEM); | |
912 | goto out; | |
913 | } | |
914 | req->in.h.opcode = FUSE_READLINK; | |
915 | req->in.h.nodeid = get_node_id(inode); | |
916 | req->out.argvar = 1; | |
917 | req->out.numargs = 1; | |
918 | req->out.args[0].size = PAGE_SIZE - 1; | |
919 | req->out.args[0].value = link; | |
920 | request_send(fc, req); | |
921 | if (req->out.h.error) { | |
922 | free_page((unsigned long) link); | |
923 | link = ERR_PTR(req->out.h.error); | |
924 | } else | |
925 | link[req->out.args[0].size] = '\0'; | |
926 | out: | |
927 | fuse_put_request(fc, req); | |
928 | fuse_invalidate_attr(inode); /* atime changed */ | |
929 | return link; | |
930 | } | |
931 | ||
932 | static void free_link(char *link) | |
933 | { | |
934 | if (!IS_ERR(link)) | |
935 | free_page((unsigned long) link); | |
936 | } | |
937 | ||
938 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
939 | { | |
940 | nd_set_link(nd, read_link(dentry)); | |
941 | return NULL; | |
942 | } | |
943 | ||
944 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
945 | { | |
946 | free_link(nd_get_link(nd)); | |
947 | } | |
948 | ||
949 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
950 | { | |
951 | return fuse_open_common(inode, file, 1); | |
952 | } | |
953 | ||
954 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
955 | { | |
956 | return fuse_release_common(inode, file, 1); | |
957 | } | |
958 | ||
959 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) | |
960 | { | |
961 | /* nfsd can call this with no file */ | |
962 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; | |
963 | } | |
964 | ||
965 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) | |
966 | { | |
967 | unsigned ivalid = iattr->ia_valid; | |
968 | ||
969 | if (ivalid & ATTR_MODE) | |
970 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; | |
971 | if (ivalid & ATTR_UID) | |
972 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; | |
973 | if (ivalid & ATTR_GID) | |
974 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; | |
975 | if (ivalid & ATTR_SIZE) | |
976 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; | |
977 | /* You can only _set_ these together (they may change by themselves) */ | |
978 | if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { | |
979 | arg->valid |= FATTR_ATIME | FATTR_MTIME; | |
980 | arg->atime = iattr->ia_atime.tv_sec; | |
981 | arg->mtime = iattr->ia_mtime.tv_sec; | |
982 | } | |
983 | if (ivalid & ATTR_FILE) { | |
984 | struct fuse_file *ff = iattr->ia_file->private_data; | |
985 | arg->valid |= FATTR_FH; | |
986 | arg->fh = ff->fh; | |
987 | } | |
988 | } | |
989 | ||
990 | /* | |
991 | * Set attributes, and at the same time refresh them. | |
992 | * | |
993 | * Truncation is slightly complicated, because the 'truncate' request | |
994 | * may fail, in which case we don't want to touch the mapping. | |
995 | * vmtruncate() doesn't allow for this case, so do the rlimit checking | |
996 | * and the actual truncation by hand. | |
997 | */ | |
998 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) | |
999 | { | |
1000 | struct inode *inode = entry->d_inode; | |
1001 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1002 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1003 | struct fuse_req *req; | |
1004 | struct fuse_setattr_in inarg; | |
1005 | struct fuse_attr_out outarg; | |
1006 | int err; | |
1007 | ||
1008 | if (!fuse_allow_task(fc, current)) | |
1009 | return -EACCES; | |
1010 | ||
1011 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
1012 | err = inode_change_ok(inode, attr); | |
1013 | if (err) | |
1014 | return err; | |
1015 | } | |
1016 | ||
1017 | if (attr->ia_valid & ATTR_SIZE) { | |
1018 | unsigned long limit; | |
1019 | if (IS_SWAPFILE(inode)) | |
1020 | return -ETXTBSY; | |
1021 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; | |
1022 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { | |
1023 | send_sig(SIGXFSZ, current, 0); | |
1024 | return -EFBIG; | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | req = fuse_get_req(fc); | |
1029 | if (IS_ERR(req)) | |
1030 | return PTR_ERR(req); | |
1031 | ||
1032 | memset(&inarg, 0, sizeof(inarg)); | |
1033 | iattr_to_fattr(attr, &inarg); | |
1034 | req->in.h.opcode = FUSE_SETATTR; | |
1035 | req->in.h.nodeid = get_node_id(inode); | |
1036 | req->in.numargs = 1; | |
1037 | req->in.args[0].size = sizeof(inarg); | |
1038 | req->in.args[0].value = &inarg; | |
1039 | req->out.numargs = 1; | |
1040 | req->out.args[0].size = sizeof(outarg); | |
1041 | req->out.args[0].value = &outarg; | |
1042 | request_send(fc, req); | |
1043 | err = req->out.h.error; | |
1044 | fuse_put_request(fc, req); | |
1045 | if (err) { | |
1046 | if (err == -EINTR) | |
1047 | fuse_invalidate_attr(inode); | |
1048 | return err; | |
1049 | } | |
1050 | ||
1051 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
1052 | make_bad_inode(inode); | |
1053 | return -EIO; | |
1054 | } | |
1055 | ||
1056 | fuse_change_attributes(inode, &outarg.attr); | |
1057 | fi->i_time = time_to_jiffies(outarg.attr_valid, outarg.attr_valid_nsec); | |
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, | |
1062 | struct kstat *stat) | |
1063 | { | |
1064 | struct inode *inode = entry->d_inode; | |
1065 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1066 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1067 | int err; | |
1068 | ||
1069 | if (!fuse_allow_task(fc, current)) | |
1070 | return -EACCES; | |
1071 | ||
1072 | err = fuse_refresh_attributes(inode); | |
1073 | if (!err) { | |
1074 | generic_fillattr(inode, stat); | |
1075 | stat->mode = fi->orig_i_mode; | |
1076 | } | |
1077 | ||
1078 | return err; | |
1079 | } | |
1080 | ||
1081 | static int fuse_setxattr(struct dentry *entry, const char *name, | |
1082 | const void *value, size_t size, int flags) | |
1083 | { | |
1084 | struct inode *inode = entry->d_inode; | |
1085 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1086 | struct fuse_req *req; | |
1087 | struct fuse_setxattr_in inarg; | |
1088 | int err; | |
1089 | ||
1090 | if (fc->no_setxattr) | |
1091 | return -EOPNOTSUPP; | |
1092 | ||
1093 | req = fuse_get_req(fc); | |
1094 | if (IS_ERR(req)) | |
1095 | return PTR_ERR(req); | |
1096 | ||
1097 | memset(&inarg, 0, sizeof(inarg)); | |
1098 | inarg.size = size; | |
1099 | inarg.flags = flags; | |
1100 | req->in.h.opcode = FUSE_SETXATTR; | |
1101 | req->in.h.nodeid = get_node_id(inode); | |
1102 | req->in.numargs = 3; | |
1103 | req->in.args[0].size = sizeof(inarg); | |
1104 | req->in.args[0].value = &inarg; | |
1105 | req->in.args[1].size = strlen(name) + 1; | |
1106 | req->in.args[1].value = name; | |
1107 | req->in.args[2].size = size; | |
1108 | req->in.args[2].value = value; | |
1109 | request_send(fc, req); | |
1110 | err = req->out.h.error; | |
1111 | fuse_put_request(fc, req); | |
1112 | if (err == -ENOSYS) { | |
1113 | fc->no_setxattr = 1; | |
1114 | err = -EOPNOTSUPP; | |
1115 | } | |
1116 | return err; | |
1117 | } | |
1118 | ||
1119 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1120 | void *value, size_t size) | |
1121 | { | |
1122 | struct inode *inode = entry->d_inode; | |
1123 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1124 | struct fuse_req *req; | |
1125 | struct fuse_getxattr_in inarg; | |
1126 | struct fuse_getxattr_out outarg; | |
1127 | ssize_t ret; | |
1128 | ||
1129 | if (fc->no_getxattr) | |
1130 | return -EOPNOTSUPP; | |
1131 | ||
1132 | req = fuse_get_req(fc); | |
1133 | if (IS_ERR(req)) | |
1134 | return PTR_ERR(req); | |
1135 | ||
1136 | memset(&inarg, 0, sizeof(inarg)); | |
1137 | inarg.size = size; | |
1138 | req->in.h.opcode = FUSE_GETXATTR; | |
1139 | req->in.h.nodeid = get_node_id(inode); | |
1140 | req->in.numargs = 2; | |
1141 | req->in.args[0].size = sizeof(inarg); | |
1142 | req->in.args[0].value = &inarg; | |
1143 | req->in.args[1].size = strlen(name) + 1; | |
1144 | req->in.args[1].value = name; | |
1145 | /* This is really two different operations rolled into one */ | |
1146 | req->out.numargs = 1; | |
1147 | if (size) { | |
1148 | req->out.argvar = 1; | |
1149 | req->out.args[0].size = size; | |
1150 | req->out.args[0].value = value; | |
1151 | } else { | |
1152 | req->out.args[0].size = sizeof(outarg); | |
1153 | req->out.args[0].value = &outarg; | |
1154 | } | |
1155 | request_send(fc, req); | |
1156 | ret = req->out.h.error; | |
1157 | if (!ret) | |
1158 | ret = size ? req->out.args[0].size : outarg.size; | |
1159 | else { | |
1160 | if (ret == -ENOSYS) { | |
1161 | fc->no_getxattr = 1; | |
1162 | ret = -EOPNOTSUPP; | |
1163 | } | |
1164 | } | |
1165 | fuse_put_request(fc, req); | |
1166 | return ret; | |
1167 | } | |
1168 | ||
1169 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1170 | { | |
1171 | struct inode *inode = entry->d_inode; | |
1172 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1173 | struct fuse_req *req; | |
1174 | struct fuse_getxattr_in inarg; | |
1175 | struct fuse_getxattr_out outarg; | |
1176 | ssize_t ret; | |
1177 | ||
1178 | if (!fuse_allow_task(fc, current)) | |
1179 | return -EACCES; | |
1180 | ||
1181 | if (fc->no_listxattr) | |
1182 | return -EOPNOTSUPP; | |
1183 | ||
1184 | req = fuse_get_req(fc); | |
1185 | if (IS_ERR(req)) | |
1186 | return PTR_ERR(req); | |
1187 | ||
1188 | memset(&inarg, 0, sizeof(inarg)); | |
1189 | inarg.size = size; | |
1190 | req->in.h.opcode = FUSE_LISTXATTR; | |
1191 | req->in.h.nodeid = get_node_id(inode); | |
1192 | req->in.numargs = 1; | |
1193 | req->in.args[0].size = sizeof(inarg); | |
1194 | req->in.args[0].value = &inarg; | |
1195 | /* This is really two different operations rolled into one */ | |
1196 | req->out.numargs = 1; | |
1197 | if (size) { | |
1198 | req->out.argvar = 1; | |
1199 | req->out.args[0].size = size; | |
1200 | req->out.args[0].value = list; | |
1201 | } else { | |
1202 | req->out.args[0].size = sizeof(outarg); | |
1203 | req->out.args[0].value = &outarg; | |
1204 | } | |
1205 | request_send(fc, req); | |
1206 | ret = req->out.h.error; | |
1207 | if (!ret) | |
1208 | ret = size ? req->out.args[0].size : outarg.size; | |
1209 | else { | |
1210 | if (ret == -ENOSYS) { | |
1211 | fc->no_listxattr = 1; | |
1212 | ret = -EOPNOTSUPP; | |
1213 | } | |
1214 | } | |
1215 | fuse_put_request(fc, req); | |
1216 | return ret; | |
1217 | } | |
1218 | ||
1219 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1220 | { | |
1221 | struct inode *inode = entry->d_inode; | |
1222 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1223 | struct fuse_req *req; | |
1224 | int err; | |
1225 | ||
1226 | if (fc->no_removexattr) | |
1227 | return -EOPNOTSUPP; | |
1228 | ||
1229 | req = fuse_get_req(fc); | |
1230 | if (IS_ERR(req)) | |
1231 | return PTR_ERR(req); | |
1232 | ||
1233 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1234 | req->in.h.nodeid = get_node_id(inode); | |
1235 | req->in.numargs = 1; | |
1236 | req->in.args[0].size = strlen(name) + 1; | |
1237 | req->in.args[0].value = name; | |
1238 | request_send(fc, req); | |
1239 | err = req->out.h.error; | |
1240 | fuse_put_request(fc, req); | |
1241 | if (err == -ENOSYS) { | |
1242 | fc->no_removexattr = 1; | |
1243 | err = -EOPNOTSUPP; | |
1244 | } | |
1245 | return err; | |
1246 | } | |
1247 | ||
1248 | static const struct inode_operations fuse_dir_inode_operations = { | |
1249 | .lookup = fuse_lookup, | |
1250 | .mkdir = fuse_mkdir, | |
1251 | .symlink = fuse_symlink, | |
1252 | .unlink = fuse_unlink, | |
1253 | .rmdir = fuse_rmdir, | |
1254 | .rename = fuse_rename, | |
1255 | .link = fuse_link, | |
1256 | .setattr = fuse_setattr, | |
1257 | .create = fuse_create, | |
1258 | .mknod = fuse_mknod, | |
1259 | .permission = fuse_permission, | |
1260 | .getattr = fuse_getattr, | |
1261 | .setxattr = fuse_setxattr, | |
1262 | .getxattr = fuse_getxattr, | |
1263 | .listxattr = fuse_listxattr, | |
1264 | .removexattr = fuse_removexattr, | |
1265 | }; | |
1266 | ||
1267 | static const struct file_operations fuse_dir_operations = { | |
1268 | .llseek = generic_file_llseek, | |
1269 | .read = generic_read_dir, | |
1270 | .readdir = fuse_readdir, | |
1271 | .open = fuse_dir_open, | |
1272 | .release = fuse_dir_release, | |
1273 | .fsync = fuse_dir_fsync, | |
1274 | }; | |
1275 | ||
1276 | static const struct inode_operations fuse_common_inode_operations = { | |
1277 | .setattr = fuse_setattr, | |
1278 | .permission = fuse_permission, | |
1279 | .getattr = fuse_getattr, | |
1280 | .setxattr = fuse_setxattr, | |
1281 | .getxattr = fuse_getxattr, | |
1282 | .listxattr = fuse_listxattr, | |
1283 | .removexattr = fuse_removexattr, | |
1284 | }; | |
1285 | ||
1286 | static const struct inode_operations fuse_symlink_inode_operations = { | |
1287 | .setattr = fuse_setattr, | |
1288 | .follow_link = fuse_follow_link, | |
1289 | .put_link = fuse_put_link, | |
1290 | .readlink = generic_readlink, | |
1291 | .getattr = fuse_getattr, | |
1292 | .setxattr = fuse_setxattr, | |
1293 | .getxattr = fuse_getxattr, | |
1294 | .listxattr = fuse_listxattr, | |
1295 | .removexattr = fuse_removexattr, | |
1296 | }; | |
1297 | ||
1298 | void fuse_init_common(struct inode *inode) | |
1299 | { | |
1300 | inode->i_op = &fuse_common_inode_operations; | |
1301 | } | |
1302 | ||
1303 | void fuse_init_dir(struct inode *inode) | |
1304 | { | |
1305 | inode->i_op = &fuse_dir_inode_operations; | |
1306 | inode->i_fop = &fuse_dir_operations; | |
1307 | } | |
1308 | ||
1309 | void fuse_init_symlink(struct inode *inode) | |
1310 | { | |
1311 | inode->i_op = &fuse_symlink_inode_operations; | |
1312 | } |