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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 | ||
6f9f1180 MS |
17 | /* |
18 | * FUSE caches dentries and attributes with separate timeout. The | |
19 | * time in jiffies until the dentry/attributes are valid is stored in | |
20 | * dentry->d_time and fuse_inode->i_time respectively. | |
21 | */ | |
22 | ||
23 | /* | |
24 | * Calculate the time in jiffies until a dentry/attributes are valid | |
25 | */ | |
e5e5558e MS |
26 | static inline unsigned long time_to_jiffies(unsigned long sec, |
27 | unsigned long nsec) | |
28 | { | |
29 | struct timespec ts = {sec, nsec}; | |
30 | return jiffies + timespec_to_jiffies(&ts); | |
31 | } | |
32 | ||
6f9f1180 MS |
33 | /* |
34 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
35 | * replies | |
36 | */ | |
0aa7c699 MS |
37 | static void fuse_change_timeout(struct dentry *entry, struct fuse_entry_out *o) |
38 | { | |
0aa7c699 | 39 | entry->d_time = time_to_jiffies(o->entry_valid, o->entry_valid_nsec); |
8cbdf1e6 MS |
40 | if (entry->d_inode) |
41 | get_fuse_inode(entry->d_inode)->i_time = | |
42 | time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
43 | } | |
44 | ||
6f9f1180 MS |
45 | /* |
46 | * Mark the attributes as stale, so that at the next call to | |
47 | * ->getattr() they will be fetched from userspace | |
48 | */ | |
8cbdf1e6 MS |
49 | void fuse_invalidate_attr(struct inode *inode) |
50 | { | |
51 | get_fuse_inode(inode)->i_time = jiffies - 1; | |
52 | } | |
53 | ||
6f9f1180 MS |
54 | /* |
55 | * Just mark the entry as stale, so that a next attempt to look it up | |
56 | * will result in a new lookup call to userspace | |
57 | * | |
58 | * This is called when a dentry is about to become negative and the | |
59 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
60 | * lookup) | |
61 | */ | |
8cbdf1e6 MS |
62 | static void fuse_invalidate_entry_cache(struct dentry *entry) |
63 | { | |
64 | entry->d_time = jiffies - 1; | |
65 | } | |
66 | ||
6f9f1180 MS |
67 | /* |
68 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
69 | * dentry from the hash | |
70 | */ | |
8cbdf1e6 MS |
71 | static void fuse_invalidate_entry(struct dentry *entry) |
72 | { | |
73 | d_invalidate(entry); | |
74 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
75 | } |
76 | ||
e5e5558e MS |
77 | static void fuse_lookup_init(struct fuse_req *req, struct inode *dir, |
78 | struct dentry *entry, | |
79 | struct fuse_entry_out *outarg) | |
80 | { | |
81 | req->in.h.opcode = FUSE_LOOKUP; | |
82 | req->in.h.nodeid = get_node_id(dir); | |
83 | req->inode = dir; | |
84 | req->in.numargs = 1; | |
85 | req->in.args[0].size = entry->d_name.len + 1; | |
86 | req->in.args[0].value = entry->d_name.name; | |
87 | req->out.numargs = 1; | |
88 | req->out.args[0].size = sizeof(struct fuse_entry_out); | |
89 | req->out.args[0].value = outarg; | |
90 | } | |
91 | ||
6f9f1180 MS |
92 | /* |
93 | * Check whether the dentry is still valid | |
94 | * | |
95 | * If the entry validity timeout has expired and the dentry is | |
96 | * positive, try to redo the lookup. If the lookup results in a | |
97 | * different inode, then let the VFS invalidate the dentry and redo | |
98 | * the lookup once more. If the lookup results in the same inode, | |
99 | * then refresh the attributes, timeouts and mark the dentry valid. | |
100 | */ | |
e5e5558e MS |
101 | static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) |
102 | { | |
8cbdf1e6 MS |
103 | struct inode *inode = entry->d_inode; |
104 | ||
105 | if (inode && is_bad_inode(inode)) | |
e5e5558e MS |
106 | return 0; |
107 | else if (time_after(jiffies, entry->d_time)) { | |
108 | int err; | |
e5e5558e | 109 | struct fuse_entry_out outarg; |
8cbdf1e6 MS |
110 | struct fuse_conn *fc; |
111 | struct fuse_req *req; | |
112 | ||
6f9f1180 | 113 | /* Doesn't hurt to "reset" the validity timeout */ |
8cbdf1e6 MS |
114 | fuse_invalidate_entry_cache(entry); |
115 | if (!inode) | |
116 | return 0; | |
117 | ||
118 | fc = get_fuse_conn(inode); | |
119 | req = fuse_get_request(fc); | |
e5e5558e MS |
120 | if (!req) |
121 | return 0; | |
122 | ||
123 | fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg); | |
7c352bdf | 124 | request_send(fc, req); |
e5e5558e | 125 | err = req->out.h.error; |
9e6268db | 126 | if (!err) { |
8cbdf1e6 | 127 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db MS |
128 | if (outarg.nodeid != get_node_id(inode)) { |
129 | fuse_send_forget(fc, req, outarg.nodeid, 1); | |
130 | return 0; | |
131 | } | |
132 | fi->nlookup ++; | |
133 | } | |
e5e5558e | 134 | fuse_put_request(fc, req); |
9e6268db | 135 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
136 | return 0; |
137 | ||
138 | fuse_change_attributes(inode, &outarg.attr); | |
0aa7c699 | 139 | fuse_change_timeout(entry, &outarg); |
e5e5558e MS |
140 | } |
141 | return 1; | |
142 | } | |
143 | ||
6f9f1180 MS |
144 | /* |
145 | * Check if there's already a hashed alias of this directory inode. | |
146 | * If yes, then lookup and mkdir must not create a new alias. | |
147 | */ | |
f007d5c9 MS |
148 | static int dir_alias(struct inode *inode) |
149 | { | |
150 | if (S_ISDIR(inode->i_mode)) { | |
f007d5c9 MS |
151 | struct dentry *alias = d_find_alias(inode); |
152 | if (alias) { | |
153 | dput(alias); | |
154 | return 1; | |
155 | } | |
156 | } | |
157 | return 0; | |
158 | } | |
159 | ||
2827d0b2 MS |
160 | static inline int invalid_nodeid(u64 nodeid) |
161 | { | |
162 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
163 | } | |
164 | ||
e5e5558e MS |
165 | static struct dentry_operations fuse_dentry_operations = { |
166 | .d_revalidate = fuse_dentry_revalidate, | |
167 | }; | |
168 | ||
39ee059a MS |
169 | static inline int valid_mode(int m) |
170 | { | |
171 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
172 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
173 | } | |
174 | ||
0aa7c699 MS |
175 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
176 | struct nameidata *nd) | |
e5e5558e MS |
177 | { |
178 | int err; | |
e5e5558e MS |
179 | struct fuse_entry_out outarg; |
180 | struct inode *inode = NULL; | |
181 | struct fuse_conn *fc = get_fuse_conn(dir); | |
182 | struct fuse_req *req; | |
183 | ||
184 | if (entry->d_name.len > FUSE_NAME_MAX) | |
0aa7c699 | 185 | return ERR_PTR(-ENAMETOOLONG); |
e5e5558e MS |
186 | |
187 | req = fuse_get_request(fc); | |
188 | if (!req) | |
0aa7c699 | 189 | return ERR_PTR(-EINTR); |
e5e5558e MS |
190 | |
191 | fuse_lookup_init(req, dir, entry, &outarg); | |
192 | request_send(fc, req); | |
e5e5558e | 193 | err = req->out.h.error; |
39ee059a MS |
194 | if (!err && ((outarg.nodeid && invalid_nodeid(outarg.nodeid)) || |
195 | !valid_mode(outarg.attr.mode))) | |
ee4e5271 | 196 | err = -EIO; |
8cbdf1e6 | 197 | if (!err && outarg.nodeid) { |
e5e5558e | 198 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
9e6268db | 199 | &outarg.attr); |
e5e5558e | 200 | if (!inode) { |
9e6268db | 201 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
0aa7c699 | 202 | return ERR_PTR(-ENOMEM); |
e5e5558e MS |
203 | } |
204 | } | |
205 | fuse_put_request(fc, req); | |
206 | if (err && err != -ENOENT) | |
0aa7c699 | 207 | return ERR_PTR(err); |
e5e5558e | 208 | |
0aa7c699 MS |
209 | if (inode && dir_alias(inode)) { |
210 | iput(inode); | |
211 | return ERR_PTR(-EIO); | |
e5e5558e | 212 | } |
0aa7c699 | 213 | d_add(entry, inode); |
e5e5558e | 214 | entry->d_op = &fuse_dentry_operations; |
8cbdf1e6 | 215 | if (!err) |
0aa7c699 | 216 | fuse_change_timeout(entry, &outarg); |
8cbdf1e6 MS |
217 | else |
218 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 | 219 | return NULL; |
e5e5558e MS |
220 | } |
221 | ||
6f9f1180 MS |
222 | /* |
223 | * Atomic create+open operation | |
224 | * | |
225 | * If the filesystem doesn't support this, then fall back to separate | |
226 | * 'mknod' + 'open' requests. | |
227 | */ | |
fd72faac MS |
228 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, |
229 | struct nameidata *nd) | |
230 | { | |
231 | int err; | |
232 | struct inode *inode; | |
233 | struct fuse_conn *fc = get_fuse_conn(dir); | |
234 | struct fuse_req *req; | |
235 | struct fuse_open_in inarg; | |
236 | struct fuse_open_out outopen; | |
237 | struct fuse_entry_out outentry; | |
fd72faac MS |
238 | struct fuse_file *ff; |
239 | struct file *file; | |
240 | int flags = nd->intent.open.flags - 1; | |
241 | ||
242 | err = -ENOSYS; | |
243 | if (fc->no_create) | |
244 | goto out; | |
245 | ||
fd72faac MS |
246 | err = -EINTR; |
247 | req = fuse_get_request(fc); | |
248 | if (!req) | |
249 | goto out; | |
250 | ||
251 | ff = fuse_file_alloc(); | |
252 | if (!ff) | |
253 | goto out_put_request; | |
254 | ||
255 | flags &= ~O_NOCTTY; | |
256 | memset(&inarg, 0, sizeof(inarg)); | |
257 | inarg.flags = flags; | |
258 | inarg.mode = mode; | |
259 | req->in.h.opcode = FUSE_CREATE; | |
260 | req->in.h.nodeid = get_node_id(dir); | |
261 | req->inode = dir; | |
262 | req->in.numargs = 2; | |
263 | req->in.args[0].size = sizeof(inarg); | |
264 | req->in.args[0].value = &inarg; | |
265 | req->in.args[1].size = entry->d_name.len + 1; | |
266 | req->in.args[1].value = entry->d_name.name; | |
267 | req->out.numargs = 2; | |
268 | req->out.args[0].size = sizeof(outentry); | |
269 | req->out.args[0].value = &outentry; | |
270 | req->out.args[1].size = sizeof(outopen); | |
271 | req->out.args[1].value = &outopen; | |
272 | request_send(fc, req); | |
273 | err = req->out.h.error; | |
274 | if (err) { | |
275 | if (err == -ENOSYS) | |
276 | fc->no_create = 1; | |
277 | goto out_free_ff; | |
278 | } | |
279 | ||
280 | err = -EIO; | |
2827d0b2 | 281 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
282 | goto out_free_ff; |
283 | ||
284 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, | |
285 | &outentry.attr); | |
286 | err = -ENOMEM; | |
287 | if (!inode) { | |
288 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
289 | ff->fh = outopen.fh; | |
6f9f1180 MS |
290 | /* Special release, with inode = NULL, this will |
291 | trigger a 'forget' request when the release is | |
292 | complete */ | |
fd72faac MS |
293 | fuse_send_release(fc, ff, outentry.nodeid, NULL, flags, 0); |
294 | goto out_put_request; | |
295 | } | |
296 | fuse_put_request(fc, req); | |
fd72faac | 297 | d_instantiate(entry, inode); |
0aa7c699 | 298 | fuse_change_timeout(entry, &outentry); |
fd72faac MS |
299 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
300 | if (IS_ERR(file)) { | |
301 | ff->fh = outopen.fh; | |
302 | fuse_send_release(fc, ff, outentry.nodeid, inode, flags, 0); | |
303 | return PTR_ERR(file); | |
304 | } | |
305 | fuse_finish_open(inode, file, ff, &outopen); | |
306 | return 0; | |
307 | ||
308 | out_free_ff: | |
309 | fuse_file_free(ff); | |
310 | out_put_request: | |
311 | fuse_put_request(fc, req); | |
312 | out: | |
313 | return err; | |
314 | } | |
315 | ||
6f9f1180 MS |
316 | /* |
317 | * Code shared between mknod, mkdir, symlink and link | |
318 | */ | |
9e6268db MS |
319 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
320 | struct inode *dir, struct dentry *entry, | |
321 | int mode) | |
322 | { | |
323 | struct fuse_entry_out outarg; | |
324 | struct inode *inode; | |
9e6268db MS |
325 | int err; |
326 | ||
327 | req->in.h.nodeid = get_node_id(dir); | |
328 | req->inode = dir; | |
329 | req->out.numargs = 1; | |
330 | req->out.args[0].size = sizeof(outarg); | |
331 | req->out.args[0].value = &outarg; | |
332 | request_send(fc, req); | |
333 | err = req->out.h.error; | |
334 | if (err) { | |
335 | fuse_put_request(fc, req); | |
336 | return err; | |
337 | } | |
39ee059a MS |
338 | err = -EIO; |
339 | if (invalid_nodeid(outarg.nodeid)) | |
340 | goto out_put_request; | |
341 | ||
342 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
343 | goto out_put_request; | |
344 | ||
9e6268db MS |
345 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
346 | &outarg.attr); | |
347 | if (!inode) { | |
348 | fuse_send_forget(fc, req, outarg.nodeid, 1); | |
349 | return -ENOMEM; | |
350 | } | |
351 | fuse_put_request(fc, req); | |
352 | ||
39ee059a | 353 | if (dir_alias(inode)) { |
9e6268db MS |
354 | iput(inode); |
355 | return -EIO; | |
356 | } | |
357 | ||
9e6268db | 358 | d_instantiate(entry, inode); |
0aa7c699 | 359 | fuse_change_timeout(entry, &outarg); |
9e6268db MS |
360 | fuse_invalidate_attr(dir); |
361 | return 0; | |
39ee059a MS |
362 | |
363 | out_put_request: | |
364 | fuse_put_request(fc, req); | |
365 | return err; | |
9e6268db MS |
366 | } |
367 | ||
368 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
369 | dev_t rdev) | |
370 | { | |
371 | struct fuse_mknod_in inarg; | |
372 | struct fuse_conn *fc = get_fuse_conn(dir); | |
373 | struct fuse_req *req = fuse_get_request(fc); | |
374 | if (!req) | |
7c352bdf | 375 | return -EINTR; |
9e6268db MS |
376 | |
377 | memset(&inarg, 0, sizeof(inarg)); | |
378 | inarg.mode = mode; | |
379 | inarg.rdev = new_encode_dev(rdev); | |
380 | req->in.h.opcode = FUSE_MKNOD; | |
381 | req->in.numargs = 2; | |
382 | req->in.args[0].size = sizeof(inarg); | |
383 | req->in.args[0].value = &inarg; | |
384 | req->in.args[1].size = entry->d_name.len + 1; | |
385 | req->in.args[1].value = entry->d_name.name; | |
386 | return create_new_entry(fc, req, dir, entry, mode); | |
387 | } | |
388 | ||
389 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
390 | struct nameidata *nd) | |
391 | { | |
fd72faac MS |
392 | if (nd && (nd->flags & LOOKUP_CREATE)) { |
393 | int err = fuse_create_open(dir, entry, mode, nd); | |
394 | if (err != -ENOSYS) | |
395 | return err; | |
396 | /* Fall back on mknod */ | |
397 | } | |
9e6268db MS |
398 | return fuse_mknod(dir, entry, mode, 0); |
399 | } | |
400 | ||
401 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
402 | { | |
403 | struct fuse_mkdir_in inarg; | |
404 | struct fuse_conn *fc = get_fuse_conn(dir); | |
405 | struct fuse_req *req = fuse_get_request(fc); | |
406 | if (!req) | |
7c352bdf | 407 | return -EINTR; |
9e6268db MS |
408 | |
409 | memset(&inarg, 0, sizeof(inarg)); | |
410 | inarg.mode = mode; | |
411 | req->in.h.opcode = FUSE_MKDIR; | |
412 | req->in.numargs = 2; | |
413 | req->in.args[0].size = sizeof(inarg); | |
414 | req->in.args[0].value = &inarg; | |
415 | req->in.args[1].size = entry->d_name.len + 1; | |
416 | req->in.args[1].value = entry->d_name.name; | |
417 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
418 | } | |
419 | ||
420 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
421 | const char *link) | |
422 | { | |
423 | struct fuse_conn *fc = get_fuse_conn(dir); | |
424 | unsigned len = strlen(link) + 1; | |
1d3d752b | 425 | struct fuse_req *req = fuse_get_request(fc); |
9e6268db | 426 | if (!req) |
7c352bdf | 427 | return -EINTR; |
9e6268db MS |
428 | |
429 | req->in.h.opcode = FUSE_SYMLINK; | |
430 | req->in.numargs = 2; | |
431 | req->in.args[0].size = entry->d_name.len + 1; | |
432 | req->in.args[0].value = entry->d_name.name; | |
433 | req->in.args[1].size = len; | |
434 | req->in.args[1].value = link; | |
435 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
436 | } | |
437 | ||
438 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
439 | { | |
440 | int err; | |
441 | struct fuse_conn *fc = get_fuse_conn(dir); | |
442 | struct fuse_req *req = fuse_get_request(fc); | |
443 | if (!req) | |
7c352bdf | 444 | return -EINTR; |
9e6268db MS |
445 | |
446 | req->in.h.opcode = FUSE_UNLINK; | |
447 | req->in.h.nodeid = get_node_id(dir); | |
448 | req->inode = dir; | |
449 | req->in.numargs = 1; | |
450 | req->in.args[0].size = entry->d_name.len + 1; | |
451 | req->in.args[0].value = entry->d_name.name; | |
452 | request_send(fc, req); | |
453 | err = req->out.h.error; | |
454 | fuse_put_request(fc, req); | |
455 | if (!err) { | |
456 | struct inode *inode = entry->d_inode; | |
457 | ||
458 | /* Set nlink to zero so the inode can be cleared, if | |
459 | the inode does have more links this will be | |
460 | discovered at the next lookup/getattr */ | |
461 | inode->i_nlink = 0; | |
462 | fuse_invalidate_attr(inode); | |
463 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 464 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
465 | } else if (err == -EINTR) |
466 | fuse_invalidate_entry(entry); | |
467 | return err; | |
468 | } | |
469 | ||
470 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
471 | { | |
472 | int err; | |
473 | struct fuse_conn *fc = get_fuse_conn(dir); | |
474 | struct fuse_req *req = fuse_get_request(fc); | |
475 | if (!req) | |
7c352bdf | 476 | return -EINTR; |
9e6268db MS |
477 | |
478 | req->in.h.opcode = FUSE_RMDIR; | |
479 | req->in.h.nodeid = get_node_id(dir); | |
480 | req->inode = dir; | |
481 | req->in.numargs = 1; | |
482 | req->in.args[0].size = entry->d_name.len + 1; | |
483 | req->in.args[0].value = entry->d_name.name; | |
484 | request_send(fc, req); | |
485 | err = req->out.h.error; | |
486 | fuse_put_request(fc, req); | |
487 | if (!err) { | |
488 | entry->d_inode->i_nlink = 0; | |
489 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 490 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
491 | } else if (err == -EINTR) |
492 | fuse_invalidate_entry(entry); | |
493 | return err; | |
494 | } | |
495 | ||
496 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
497 | struct inode *newdir, struct dentry *newent) | |
498 | { | |
499 | int err; | |
500 | struct fuse_rename_in inarg; | |
501 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
502 | struct fuse_req *req = fuse_get_request(fc); | |
503 | if (!req) | |
7c352bdf | 504 | return -EINTR; |
9e6268db MS |
505 | |
506 | memset(&inarg, 0, sizeof(inarg)); | |
507 | inarg.newdir = get_node_id(newdir); | |
508 | req->in.h.opcode = FUSE_RENAME; | |
509 | req->in.h.nodeid = get_node_id(olddir); | |
510 | req->inode = olddir; | |
511 | req->inode2 = newdir; | |
512 | req->in.numargs = 3; | |
513 | req->in.args[0].size = sizeof(inarg); | |
514 | req->in.args[0].value = &inarg; | |
515 | req->in.args[1].size = oldent->d_name.len + 1; | |
516 | req->in.args[1].value = oldent->d_name.name; | |
517 | req->in.args[2].size = newent->d_name.len + 1; | |
518 | req->in.args[2].value = newent->d_name.name; | |
519 | request_send(fc, req); | |
520 | err = req->out.h.error; | |
521 | fuse_put_request(fc, req); | |
522 | if (!err) { | |
523 | fuse_invalidate_attr(olddir); | |
524 | if (olddir != newdir) | |
525 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
526 | |
527 | /* newent will end up negative */ | |
528 | if (newent->d_inode) | |
529 | fuse_invalidate_entry_cache(newent); | |
9e6268db MS |
530 | } else if (err == -EINTR) { |
531 | /* If request was interrupted, DEITY only knows if the | |
532 | rename actually took place. If the invalidation | |
533 | fails (e.g. some process has CWD under the renamed | |
534 | directory), then there can be inconsistency between | |
535 | the dcache and the real filesystem. Tough luck. */ | |
536 | fuse_invalidate_entry(oldent); | |
537 | if (newent->d_inode) | |
538 | fuse_invalidate_entry(newent); | |
539 | } | |
540 | ||
541 | return err; | |
542 | } | |
543 | ||
544 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
545 | struct dentry *newent) | |
546 | { | |
547 | int err; | |
548 | struct fuse_link_in inarg; | |
549 | struct inode *inode = entry->d_inode; | |
550 | struct fuse_conn *fc = get_fuse_conn(inode); | |
551 | struct fuse_req *req = fuse_get_request(fc); | |
552 | if (!req) | |
7c352bdf | 553 | return -EINTR; |
9e6268db MS |
554 | |
555 | memset(&inarg, 0, sizeof(inarg)); | |
556 | inarg.oldnodeid = get_node_id(inode); | |
557 | req->in.h.opcode = FUSE_LINK; | |
558 | req->inode2 = inode; | |
559 | req->in.numargs = 2; | |
560 | req->in.args[0].size = sizeof(inarg); | |
561 | req->in.args[0].value = &inarg; | |
562 | req->in.args[1].size = newent->d_name.len + 1; | |
563 | req->in.args[1].value = newent->d_name.name; | |
564 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
565 | /* Contrary to "normal" filesystems it can happen that link | |
566 | makes two "logical" inodes point to the same "physical" | |
567 | inode. We invalidate the attributes of the old one, so it | |
568 | will reflect changes in the backing inode (link count, | |
569 | etc.) | |
570 | */ | |
571 | if (!err || err == -EINTR) | |
572 | fuse_invalidate_attr(inode); | |
573 | return err; | |
574 | } | |
575 | ||
e5e5558e MS |
576 | int fuse_do_getattr(struct inode *inode) |
577 | { | |
578 | int err; | |
579 | struct fuse_attr_out arg; | |
580 | struct fuse_conn *fc = get_fuse_conn(inode); | |
581 | struct fuse_req *req = fuse_get_request(fc); | |
582 | if (!req) | |
7c352bdf | 583 | return -EINTR; |
e5e5558e MS |
584 | |
585 | req->in.h.opcode = FUSE_GETATTR; | |
586 | req->in.h.nodeid = get_node_id(inode); | |
587 | req->inode = inode; | |
588 | req->out.numargs = 1; | |
589 | req->out.args[0].size = sizeof(arg); | |
590 | req->out.args[0].value = &arg; | |
591 | request_send(fc, req); | |
592 | err = req->out.h.error; | |
593 | fuse_put_request(fc, req); | |
594 | if (!err) { | |
595 | if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) { | |
596 | make_bad_inode(inode); | |
597 | err = -EIO; | |
598 | } else { | |
599 | struct fuse_inode *fi = get_fuse_inode(inode); | |
600 | fuse_change_attributes(inode, &arg.attr); | |
601 | fi->i_time = time_to_jiffies(arg.attr_valid, | |
602 | arg.attr_valid_nsec); | |
603 | } | |
604 | } | |
605 | return err; | |
606 | } | |
607 | ||
87729a55 MS |
608 | /* |
609 | * Calling into a user-controlled filesystem gives the filesystem | |
610 | * daemon ptrace-like capabilities over the requester process. This | |
611 | * means, that the filesystem daemon is able to record the exact | |
612 | * filesystem operations performed, and can also control the behavior | |
613 | * of the requester process in otherwise impossible ways. For example | |
614 | * it can delay the operation for arbitrary length of time allowing | |
615 | * DoS against the requester. | |
616 | * | |
617 | * For this reason only those processes can call into the filesystem, | |
618 | * for which the owner of the mount has ptrace privilege. This | |
619 | * excludes processes started by other users, suid or sgid processes. | |
620 | */ | |
621 | static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) | |
622 | { | |
623 | if (fc->flags & FUSE_ALLOW_OTHER) | |
624 | return 1; | |
625 | ||
626 | if (task->euid == fc->user_id && | |
627 | task->suid == fc->user_id && | |
628 | task->uid == fc->user_id && | |
629 | task->egid == fc->group_id && | |
630 | task->sgid == fc->group_id && | |
631 | task->gid == fc->group_id) | |
632 | return 1; | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
6f9f1180 MS |
637 | /* |
638 | * Check whether the inode attributes are still valid | |
639 | * | |
640 | * If the attribute validity timeout has expired, then fetch the fresh | |
641 | * attributes with a 'getattr' request | |
642 | * | |
643 | * I'm not sure why cached attributes are never returned for the root | |
644 | * inode, this is probably being too cautious. | |
645 | */ | |
e5e5558e MS |
646 | static int fuse_revalidate(struct dentry *entry) |
647 | { | |
648 | struct inode *inode = entry->d_inode; | |
649 | struct fuse_inode *fi = get_fuse_inode(inode); | |
650 | struct fuse_conn *fc = get_fuse_conn(inode); | |
651 | ||
87729a55 MS |
652 | if (!fuse_allow_task(fc, current)) |
653 | return -EACCES; | |
654 | if (get_node_id(inode) != FUSE_ROOT_ID && | |
655 | time_before_eq(jiffies, fi->i_time)) | |
e5e5558e MS |
656 | return 0; |
657 | ||
658 | return fuse_do_getattr(inode); | |
659 | } | |
660 | ||
31d40d74 MS |
661 | static int fuse_access(struct inode *inode, int mask) |
662 | { | |
663 | struct fuse_conn *fc = get_fuse_conn(inode); | |
664 | struct fuse_req *req; | |
665 | struct fuse_access_in inarg; | |
666 | int err; | |
667 | ||
668 | if (fc->no_access) | |
669 | return 0; | |
670 | ||
671 | req = fuse_get_request(fc); | |
672 | if (!req) | |
673 | return -EINTR; | |
674 | ||
675 | memset(&inarg, 0, sizeof(inarg)); | |
676 | inarg.mask = mask; | |
677 | req->in.h.opcode = FUSE_ACCESS; | |
678 | req->in.h.nodeid = get_node_id(inode); | |
679 | req->inode = inode; | |
680 | req->in.numargs = 1; | |
681 | req->in.args[0].size = sizeof(inarg); | |
682 | req->in.args[0].value = &inarg; | |
683 | request_send(fc, req); | |
684 | err = req->out.h.error; | |
685 | fuse_put_request(fc, req); | |
686 | if (err == -ENOSYS) { | |
687 | fc->no_access = 1; | |
688 | err = 0; | |
689 | } | |
690 | return err; | |
691 | } | |
692 | ||
6f9f1180 MS |
693 | /* |
694 | * Check permission. The two basic access models of FUSE are: | |
695 | * | |
696 | * 1) Local access checking ('default_permissions' mount option) based | |
697 | * on file mode. This is the plain old disk filesystem permission | |
698 | * modell. | |
699 | * | |
700 | * 2) "Remote" access checking, where server is responsible for | |
701 | * checking permission in each inode operation. An exception to this | |
702 | * is if ->permission() was invoked from sys_access() in which case an | |
703 | * access request is sent. Execute permission is still checked | |
704 | * locally based on file mode. | |
705 | */ | |
e5e5558e MS |
706 | static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) |
707 | { | |
708 | struct fuse_conn *fc = get_fuse_conn(inode); | |
709 | ||
87729a55 | 710 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 711 | return -EACCES; |
1e9a4ed9 MS |
712 | else if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
713 | int err = generic_permission(inode, mask, NULL); | |
714 | ||
715 | /* If permission is denied, try to refresh file | |
716 | attributes. This is also needed, because the root | |
717 | node will at first have no permissions */ | |
718 | if (err == -EACCES) { | |
719 | err = fuse_do_getattr(inode); | |
720 | if (!err) | |
721 | err = generic_permission(inode, mask, NULL); | |
722 | } | |
723 | ||
6f9f1180 MS |
724 | /* Note: the opposite of the above test does not |
725 | exist. So if permissions are revoked this won't be | |
726 | noticed immediately, only after the attribute | |
727 | timeout has expired */ | |
1e9a4ed9 MS |
728 | |
729 | return err; | |
730 | } else { | |
e5e5558e | 731 | int mode = inode->i_mode; |
e5e5558e MS |
732 | if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO)) |
733 | return -EACCES; | |
31d40d74 MS |
734 | |
735 | if (nd && (nd->flags & LOOKUP_ACCESS)) | |
736 | return fuse_access(inode, mask); | |
e5e5558e MS |
737 | return 0; |
738 | } | |
739 | } | |
740 | ||
741 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
742 | void *dstbuf, filldir_t filldir) | |
743 | { | |
744 | while (nbytes >= FUSE_NAME_OFFSET) { | |
745 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
746 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
747 | int over; | |
748 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
749 | return -EIO; | |
750 | if (reclen > nbytes) | |
751 | break; | |
752 | ||
753 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
754 | file->f_pos, dirent->ino, dirent->type); | |
755 | if (over) | |
756 | break; | |
757 | ||
758 | buf += reclen; | |
759 | nbytes -= reclen; | |
760 | file->f_pos = dirent->off; | |
761 | } | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
04730fef MS |
766 | static inline size_t fuse_send_readdir(struct fuse_req *req, struct file *file, |
767 | struct inode *inode, loff_t pos, | |
768 | size_t count) | |
e5e5558e | 769 | { |
04730fef | 770 | return fuse_send_read_common(req, file, inode, pos, count, 1); |
e5e5558e MS |
771 | } |
772 | ||
04730fef | 773 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 774 | { |
04730fef MS |
775 | int err; |
776 | size_t nbytes; | |
777 | struct page *page; | |
e5e5558e MS |
778 | struct inode *inode = file->f_dentry->d_inode; |
779 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 MS |
780 | struct fuse_req *req; |
781 | ||
782 | if (is_bad_inode(inode)) | |
783 | return -EIO; | |
784 | ||
785 | req = fuse_get_request(fc); | |
e5e5558e | 786 | if (!req) |
04730fef | 787 | return -EINTR; |
e5e5558e | 788 | |
04730fef MS |
789 | page = alloc_page(GFP_KERNEL); |
790 | if (!page) { | |
791 | fuse_put_request(fc, req); | |
792 | return -ENOMEM; | |
793 | } | |
794 | req->num_pages = 1; | |
795 | req->pages[0] = page; | |
796 | nbytes = fuse_send_readdir(req, file, inode, file->f_pos, PAGE_SIZE); | |
e5e5558e MS |
797 | err = req->out.h.error; |
798 | fuse_put_request(fc, req); | |
799 | if (!err) | |
04730fef MS |
800 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
801 | filldir); | |
e5e5558e | 802 | |
04730fef | 803 | __free_page(page); |
b36c31ba | 804 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 805 | return err; |
e5e5558e MS |
806 | } |
807 | ||
808 | static char *read_link(struct dentry *dentry) | |
809 | { | |
810 | struct inode *inode = dentry->d_inode; | |
811 | struct fuse_conn *fc = get_fuse_conn(inode); | |
812 | struct fuse_req *req = fuse_get_request(fc); | |
813 | char *link; | |
814 | ||
815 | if (!req) | |
7c352bdf | 816 | return ERR_PTR(-EINTR); |
e5e5558e MS |
817 | |
818 | link = (char *) __get_free_page(GFP_KERNEL); | |
819 | if (!link) { | |
820 | link = ERR_PTR(-ENOMEM); | |
821 | goto out; | |
822 | } | |
823 | req->in.h.opcode = FUSE_READLINK; | |
824 | req->in.h.nodeid = get_node_id(inode); | |
825 | req->inode = inode; | |
826 | req->out.argvar = 1; | |
827 | req->out.numargs = 1; | |
828 | req->out.args[0].size = PAGE_SIZE - 1; | |
829 | req->out.args[0].value = link; | |
830 | request_send(fc, req); | |
831 | if (req->out.h.error) { | |
832 | free_page((unsigned long) link); | |
833 | link = ERR_PTR(req->out.h.error); | |
834 | } else | |
835 | link[req->out.args[0].size] = '\0'; | |
836 | out: | |
837 | fuse_put_request(fc, req); | |
b36c31ba | 838 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
839 | return link; |
840 | } | |
841 | ||
842 | static void free_link(char *link) | |
843 | { | |
844 | if (!IS_ERR(link)) | |
845 | free_page((unsigned long) link); | |
846 | } | |
847 | ||
848 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
849 | { | |
850 | nd_set_link(nd, read_link(dentry)); | |
851 | return NULL; | |
852 | } | |
853 | ||
854 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
855 | { | |
856 | free_link(nd_get_link(nd)); | |
857 | } | |
858 | ||
859 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
860 | { | |
04730fef | 861 | return fuse_open_common(inode, file, 1); |
e5e5558e MS |
862 | } |
863 | ||
864 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
865 | { | |
04730fef | 866 | return fuse_release_common(inode, file, 1); |
e5e5558e MS |
867 | } |
868 | ||
82547981 MS |
869 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) |
870 | { | |
871 | /* nfsd can call this with no file */ | |
872 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; | |
873 | } | |
874 | ||
befc649c | 875 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
876 | { |
877 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
878 | |
879 | if (ivalid & ATTR_MODE) | |
befc649c | 880 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 881 | if (ivalid & ATTR_UID) |
befc649c | 882 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 883 | if (ivalid & ATTR_GID) |
befc649c | 884 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 885 | if (ivalid & ATTR_SIZE) |
befc649c | 886 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
9e6268db MS |
887 | /* You can only _set_ these together (they may change by themselves) */ |
888 | if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { | |
befc649c MS |
889 | arg->valid |= FATTR_ATIME | FATTR_MTIME; |
890 | arg->atime = iattr->ia_atime.tv_sec; | |
891 | arg->mtime = iattr->ia_mtime.tv_sec; | |
892 | } | |
893 | if (ivalid & ATTR_FILE) { | |
894 | struct fuse_file *ff = iattr->ia_file->private_data; | |
895 | arg->valid |= FATTR_FH; | |
896 | arg->fh = ff->fh; | |
9e6268db | 897 | } |
9e6268db MS |
898 | } |
899 | ||
6f9f1180 MS |
900 | /* |
901 | * Set attributes, and at the same time refresh them. | |
902 | * | |
903 | * Truncation is slightly complicated, because the 'truncate' request | |
904 | * may fail, in which case we don't want to touch the mapping. | |
905 | * vmtruncate() doesn't allow for this case. So do the rlimit | |
906 | * checking by hand and call vmtruncate() only after the file has | |
907 | * actually been truncated. | |
908 | */ | |
9e6268db MS |
909 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
910 | { | |
911 | struct inode *inode = entry->d_inode; | |
912 | struct fuse_conn *fc = get_fuse_conn(inode); | |
913 | struct fuse_inode *fi = get_fuse_inode(inode); | |
914 | struct fuse_req *req; | |
915 | struct fuse_setattr_in inarg; | |
916 | struct fuse_attr_out outarg; | |
917 | int err; | |
918 | int is_truncate = 0; | |
919 | ||
1e9a4ed9 MS |
920 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
921 | err = inode_change_ok(inode, attr); | |
922 | if (err) | |
923 | return err; | |
924 | } | |
925 | ||
9e6268db MS |
926 | if (attr->ia_valid & ATTR_SIZE) { |
927 | unsigned long limit; | |
928 | is_truncate = 1; | |
929 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; | |
930 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { | |
931 | send_sig(SIGXFSZ, current, 0); | |
932 | return -EFBIG; | |
933 | } | |
934 | } | |
935 | ||
936 | req = fuse_get_request(fc); | |
937 | if (!req) | |
7c352bdf | 938 | return -EINTR; |
9e6268db MS |
939 | |
940 | memset(&inarg, 0, sizeof(inarg)); | |
befc649c | 941 | iattr_to_fattr(attr, &inarg); |
9e6268db MS |
942 | req->in.h.opcode = FUSE_SETATTR; |
943 | req->in.h.nodeid = get_node_id(inode); | |
944 | req->inode = inode; | |
945 | req->in.numargs = 1; | |
946 | req->in.args[0].size = sizeof(inarg); | |
947 | req->in.args[0].value = &inarg; | |
948 | req->out.numargs = 1; | |
949 | req->out.args[0].size = sizeof(outarg); | |
950 | req->out.args[0].value = &outarg; | |
951 | request_send(fc, req); | |
952 | err = req->out.h.error; | |
953 | fuse_put_request(fc, req); | |
954 | if (!err) { | |
955 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
956 | make_bad_inode(inode); | |
957 | err = -EIO; | |
958 | } else { | |
959 | if (is_truncate) { | |
960 | loff_t origsize = i_size_read(inode); | |
961 | i_size_write(inode, outarg.attr.size); | |
962 | if (origsize > outarg.attr.size) | |
963 | vmtruncate(inode, outarg.attr.size); | |
964 | } | |
965 | fuse_change_attributes(inode, &outarg.attr); | |
966 | fi->i_time = time_to_jiffies(outarg.attr_valid, | |
967 | outarg.attr_valid_nsec); | |
968 | } | |
969 | } else if (err == -EINTR) | |
970 | fuse_invalidate_attr(inode); | |
971 | ||
972 | return err; | |
973 | } | |
974 | ||
e5e5558e MS |
975 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
976 | struct kstat *stat) | |
977 | { | |
978 | struct inode *inode = entry->d_inode; | |
979 | int err = fuse_revalidate(entry); | |
980 | if (!err) | |
981 | generic_fillattr(inode, stat); | |
982 | ||
983 | return err; | |
984 | } | |
985 | ||
92a8780e MS |
986 | static int fuse_setxattr(struct dentry *entry, const char *name, |
987 | const void *value, size_t size, int flags) | |
988 | { | |
989 | struct inode *inode = entry->d_inode; | |
990 | struct fuse_conn *fc = get_fuse_conn(inode); | |
991 | struct fuse_req *req; | |
992 | struct fuse_setxattr_in inarg; | |
993 | int err; | |
994 | ||
92a8780e MS |
995 | if (fc->no_setxattr) |
996 | return -EOPNOTSUPP; | |
997 | ||
998 | req = fuse_get_request(fc); | |
999 | if (!req) | |
7c352bdf | 1000 | return -EINTR; |
92a8780e MS |
1001 | |
1002 | memset(&inarg, 0, sizeof(inarg)); | |
1003 | inarg.size = size; | |
1004 | inarg.flags = flags; | |
1005 | req->in.h.opcode = FUSE_SETXATTR; | |
1006 | req->in.h.nodeid = get_node_id(inode); | |
1007 | req->inode = inode; | |
1008 | req->in.numargs = 3; | |
1009 | req->in.args[0].size = sizeof(inarg); | |
1010 | req->in.args[0].value = &inarg; | |
1011 | req->in.args[1].size = strlen(name) + 1; | |
1012 | req->in.args[1].value = name; | |
1013 | req->in.args[2].size = size; | |
1014 | req->in.args[2].value = value; | |
1015 | request_send(fc, req); | |
1016 | err = req->out.h.error; | |
1017 | fuse_put_request(fc, req); | |
1018 | if (err == -ENOSYS) { | |
1019 | fc->no_setxattr = 1; | |
1020 | err = -EOPNOTSUPP; | |
1021 | } | |
1022 | return err; | |
1023 | } | |
1024 | ||
1025 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1026 | void *value, size_t size) | |
1027 | { | |
1028 | struct inode *inode = entry->d_inode; | |
1029 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1030 | struct fuse_req *req; | |
1031 | struct fuse_getxattr_in inarg; | |
1032 | struct fuse_getxattr_out outarg; | |
1033 | ssize_t ret; | |
1034 | ||
1035 | if (fc->no_getxattr) | |
1036 | return -EOPNOTSUPP; | |
1037 | ||
1038 | req = fuse_get_request(fc); | |
1039 | if (!req) | |
7c352bdf | 1040 | return -EINTR; |
92a8780e MS |
1041 | |
1042 | memset(&inarg, 0, sizeof(inarg)); | |
1043 | inarg.size = size; | |
1044 | req->in.h.opcode = FUSE_GETXATTR; | |
1045 | req->in.h.nodeid = get_node_id(inode); | |
1046 | req->inode = inode; | |
1047 | req->in.numargs = 2; | |
1048 | req->in.args[0].size = sizeof(inarg); | |
1049 | req->in.args[0].value = &inarg; | |
1050 | req->in.args[1].size = strlen(name) + 1; | |
1051 | req->in.args[1].value = name; | |
1052 | /* This is really two different operations rolled into one */ | |
1053 | req->out.numargs = 1; | |
1054 | if (size) { | |
1055 | req->out.argvar = 1; | |
1056 | req->out.args[0].size = size; | |
1057 | req->out.args[0].value = value; | |
1058 | } else { | |
1059 | req->out.args[0].size = sizeof(outarg); | |
1060 | req->out.args[0].value = &outarg; | |
1061 | } | |
1062 | request_send(fc, req); | |
1063 | ret = req->out.h.error; | |
1064 | if (!ret) | |
1065 | ret = size ? req->out.args[0].size : outarg.size; | |
1066 | else { | |
1067 | if (ret == -ENOSYS) { | |
1068 | fc->no_getxattr = 1; | |
1069 | ret = -EOPNOTSUPP; | |
1070 | } | |
1071 | } | |
1072 | fuse_put_request(fc, req); | |
1073 | return ret; | |
1074 | } | |
1075 | ||
1076 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1077 | { | |
1078 | struct inode *inode = entry->d_inode; | |
1079 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1080 | struct fuse_req *req; | |
1081 | struct fuse_getxattr_in inarg; | |
1082 | struct fuse_getxattr_out outarg; | |
1083 | ssize_t ret; | |
1084 | ||
1085 | if (fc->no_listxattr) | |
1086 | return -EOPNOTSUPP; | |
1087 | ||
1088 | req = fuse_get_request(fc); | |
1089 | if (!req) | |
7c352bdf | 1090 | return -EINTR; |
92a8780e MS |
1091 | |
1092 | memset(&inarg, 0, sizeof(inarg)); | |
1093 | inarg.size = size; | |
1094 | req->in.h.opcode = FUSE_LISTXATTR; | |
1095 | req->in.h.nodeid = get_node_id(inode); | |
1096 | req->inode = inode; | |
1097 | req->in.numargs = 1; | |
1098 | req->in.args[0].size = sizeof(inarg); | |
1099 | req->in.args[0].value = &inarg; | |
1100 | /* This is really two different operations rolled into one */ | |
1101 | req->out.numargs = 1; | |
1102 | if (size) { | |
1103 | req->out.argvar = 1; | |
1104 | req->out.args[0].size = size; | |
1105 | req->out.args[0].value = list; | |
1106 | } else { | |
1107 | req->out.args[0].size = sizeof(outarg); | |
1108 | req->out.args[0].value = &outarg; | |
1109 | } | |
1110 | request_send(fc, req); | |
1111 | ret = req->out.h.error; | |
1112 | if (!ret) | |
1113 | ret = size ? req->out.args[0].size : outarg.size; | |
1114 | else { | |
1115 | if (ret == -ENOSYS) { | |
1116 | fc->no_listxattr = 1; | |
1117 | ret = -EOPNOTSUPP; | |
1118 | } | |
1119 | } | |
1120 | fuse_put_request(fc, req); | |
1121 | return ret; | |
1122 | } | |
1123 | ||
1124 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1125 | { | |
1126 | struct inode *inode = entry->d_inode; | |
1127 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1128 | struct fuse_req *req; | |
1129 | int err; | |
1130 | ||
1131 | if (fc->no_removexattr) | |
1132 | return -EOPNOTSUPP; | |
1133 | ||
1134 | req = fuse_get_request(fc); | |
1135 | if (!req) | |
7c352bdf | 1136 | return -EINTR; |
92a8780e MS |
1137 | |
1138 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1139 | req->in.h.nodeid = get_node_id(inode); | |
1140 | req->inode = inode; | |
1141 | req->in.numargs = 1; | |
1142 | req->in.args[0].size = strlen(name) + 1; | |
1143 | req->in.args[0].value = name; | |
1144 | request_send(fc, req); | |
1145 | err = req->out.h.error; | |
1146 | fuse_put_request(fc, req); | |
1147 | if (err == -ENOSYS) { | |
1148 | fc->no_removexattr = 1; | |
1149 | err = -EOPNOTSUPP; | |
1150 | } | |
1151 | return err; | |
1152 | } | |
1153 | ||
e5e5558e MS |
1154 | static struct inode_operations fuse_dir_inode_operations = { |
1155 | .lookup = fuse_lookup, | |
9e6268db MS |
1156 | .mkdir = fuse_mkdir, |
1157 | .symlink = fuse_symlink, | |
1158 | .unlink = fuse_unlink, | |
1159 | .rmdir = fuse_rmdir, | |
1160 | .rename = fuse_rename, | |
1161 | .link = fuse_link, | |
1162 | .setattr = fuse_setattr, | |
1163 | .create = fuse_create, | |
1164 | .mknod = fuse_mknod, | |
e5e5558e MS |
1165 | .permission = fuse_permission, |
1166 | .getattr = fuse_getattr, | |
92a8780e MS |
1167 | .setxattr = fuse_setxattr, |
1168 | .getxattr = fuse_getxattr, | |
1169 | .listxattr = fuse_listxattr, | |
1170 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1171 | }; |
1172 | ||
1173 | static struct file_operations fuse_dir_operations = { | |
b6aeaded | 1174 | .llseek = generic_file_llseek, |
e5e5558e MS |
1175 | .read = generic_read_dir, |
1176 | .readdir = fuse_readdir, | |
1177 | .open = fuse_dir_open, | |
1178 | .release = fuse_dir_release, | |
82547981 | 1179 | .fsync = fuse_dir_fsync, |
e5e5558e MS |
1180 | }; |
1181 | ||
1182 | static struct inode_operations fuse_common_inode_operations = { | |
9e6268db | 1183 | .setattr = fuse_setattr, |
e5e5558e MS |
1184 | .permission = fuse_permission, |
1185 | .getattr = fuse_getattr, | |
92a8780e MS |
1186 | .setxattr = fuse_setxattr, |
1187 | .getxattr = fuse_getxattr, | |
1188 | .listxattr = fuse_listxattr, | |
1189 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1190 | }; |
1191 | ||
1192 | static struct inode_operations fuse_symlink_inode_operations = { | |
9e6268db | 1193 | .setattr = fuse_setattr, |
e5e5558e MS |
1194 | .follow_link = fuse_follow_link, |
1195 | .put_link = fuse_put_link, | |
1196 | .readlink = generic_readlink, | |
1197 | .getattr = fuse_getattr, | |
92a8780e MS |
1198 | .setxattr = fuse_setxattr, |
1199 | .getxattr = fuse_getxattr, | |
1200 | .listxattr = fuse_listxattr, | |
1201 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1202 | }; |
1203 | ||
1204 | void fuse_init_common(struct inode *inode) | |
1205 | { | |
1206 | inode->i_op = &fuse_common_inode_operations; | |
1207 | } | |
1208 | ||
1209 | void fuse_init_dir(struct inode *inode) | |
1210 | { | |
1211 | inode->i_op = &fuse_dir_inode_operations; | |
1212 | inode->i_fop = &fuse_dir_operations; | |
1213 | } | |
1214 | ||
1215 | void fuse_init_symlink(struct inode *inode) | |
1216 | { | |
1217 | inode->i_op = &fuse_symlink_inode_operations; | |
1218 | } |