Commit | Line | Data |
---|---|---|
e5e5558e MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
51eb01e7 | 3 | Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> |
e5e5558e MS |
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 | ||
0a0898cf MS |
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 | ||
6f9f1180 MS |
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 | */ | |
0a0898cf | 53 | static u64 time_to_jiffies(unsigned long sec, unsigned long nsec) |
e5e5558e | 54 | { |
685d16dd MS |
55 | if (sec || nsec) { |
56 | struct timespec ts = {sec, nsec}; | |
0a0898cf | 57 | return get_jiffies_64() + timespec_to_jiffies(&ts); |
685d16dd | 58 | } else |
0a0898cf | 59 | return 0; |
e5e5558e MS |
60 | } |
61 | ||
6f9f1180 MS |
62 | /* |
63 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
64 | * replies | |
65 | */ | |
0aa7c699 MS |
66 | static void fuse_change_timeout(struct dentry *entry, struct fuse_entry_out *o) |
67 | { | |
0a0898cf MS |
68 | fuse_dentry_settime(entry, |
69 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
8cbdf1e6 MS |
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 | ||
6f9f1180 MS |
75 | /* |
76 | * Mark the attributes as stale, so that at the next call to | |
77 | * ->getattr() they will be fetched from userspace | |
78 | */ | |
8cbdf1e6 MS |
79 | void fuse_invalidate_attr(struct inode *inode) |
80 | { | |
0a0898cf | 81 | get_fuse_inode(inode)->i_time = 0; |
8cbdf1e6 MS |
82 | } |
83 | ||
6f9f1180 MS |
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 | */ | |
8cbdf1e6 MS |
92 | static void fuse_invalidate_entry_cache(struct dentry *entry) |
93 | { | |
0a0898cf | 94 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
95 | } |
96 | ||
6f9f1180 MS |
97 | /* |
98 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
99 | * dentry from the hash | |
100 | */ | |
8cbdf1e6 MS |
101 | static void fuse_invalidate_entry(struct dentry *entry) |
102 | { | |
103 | d_invalidate(entry); | |
104 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
105 | } |
106 | ||
e5e5558e MS |
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); | |
e5e5558e MS |
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 | ||
6f9f1180 MS |
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 | */ | |
e5e5558e MS |
130 | static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) |
131 | { | |
8cbdf1e6 MS |
132 | struct inode *inode = entry->d_inode; |
133 | ||
134 | if (inode && is_bad_inode(inode)) | |
e5e5558e | 135 | return 0; |
0a0898cf | 136 | else if (fuse_dentry_time(entry) < get_jiffies_64()) { |
e5e5558e | 137 | int err; |
e5e5558e | 138 | struct fuse_entry_out outarg; |
8cbdf1e6 MS |
139 | struct fuse_conn *fc; |
140 | struct fuse_req *req; | |
141 | ||
6f9f1180 | 142 | /* Doesn't hurt to "reset" the validity timeout */ |
8cbdf1e6 | 143 | fuse_invalidate_entry_cache(entry); |
50322fe7 MS |
144 | |
145 | /* For negative dentries, always do a fresh lookup */ | |
8cbdf1e6 MS |
146 | if (!inode) |
147 | return 0; | |
148 | ||
149 | fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
150 | req = fuse_get_req(fc); |
151 | if (IS_ERR(req)) | |
e5e5558e MS |
152 | return 0; |
153 | ||
154 | fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg); | |
7c352bdf | 155 | request_send(fc, req); |
e5e5558e | 156 | err = req->out.h.error; |
50322fe7 MS |
157 | /* Zero nodeid is same as -ENOENT */ |
158 | if (!err && !outarg.nodeid) | |
159 | err = -ENOENT; | |
9e6268db | 160 | if (!err) { |
8cbdf1e6 | 161 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db MS |
162 | if (outarg.nodeid != get_node_id(inode)) { |
163 | fuse_send_forget(fc, req, outarg.nodeid, 1); | |
164 | return 0; | |
165 | } | |
166 | fi->nlookup ++; | |
167 | } | |
e5e5558e | 168 | fuse_put_request(fc, req); |
9e6268db | 169 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
170 | return 0; |
171 | ||
172 | fuse_change_attributes(inode, &outarg.attr); | |
0aa7c699 | 173 | fuse_change_timeout(entry, &outarg); |
e5e5558e MS |
174 | } |
175 | return 1; | |
176 | } | |
177 | ||
6f9f1180 MS |
178 | /* |
179 | * Check if there's already a hashed alias of this directory inode. | |
180 | * If yes, then lookup and mkdir must not create a new alias. | |
181 | */ | |
f007d5c9 MS |
182 | static int dir_alias(struct inode *inode) |
183 | { | |
184 | if (S_ISDIR(inode->i_mode)) { | |
f007d5c9 MS |
185 | struct dentry *alias = d_find_alias(inode); |
186 | if (alias) { | |
187 | dput(alias); | |
188 | return 1; | |
189 | } | |
190 | } | |
191 | return 0; | |
192 | } | |
193 | ||
8bfc016d | 194 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
195 | { |
196 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
197 | } | |
198 | ||
e5e5558e MS |
199 | static struct dentry_operations fuse_dentry_operations = { |
200 | .d_revalidate = fuse_dentry_revalidate, | |
201 | }; | |
202 | ||
8bfc016d | 203 | static int valid_mode(int m) |
39ee059a MS |
204 | { |
205 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
206 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
207 | } | |
208 | ||
0aa7c699 MS |
209 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
210 | struct nameidata *nd) | |
e5e5558e MS |
211 | { |
212 | int err; | |
e5e5558e MS |
213 | struct fuse_entry_out outarg; |
214 | struct inode *inode = NULL; | |
215 | struct fuse_conn *fc = get_fuse_conn(dir); | |
216 | struct fuse_req *req; | |
217 | ||
218 | if (entry->d_name.len > FUSE_NAME_MAX) | |
0aa7c699 | 219 | return ERR_PTR(-ENAMETOOLONG); |
e5e5558e | 220 | |
ce1d5a49 MS |
221 | req = fuse_get_req(fc); |
222 | if (IS_ERR(req)) | |
223 | return ERR_PTR(PTR_ERR(req)); | |
e5e5558e MS |
224 | |
225 | fuse_lookup_init(req, dir, entry, &outarg); | |
226 | request_send(fc, req); | |
e5e5558e | 227 | err = req->out.h.error; |
50322fe7 MS |
228 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
229 | if (!err && outarg.nodeid && | |
230 | (invalid_nodeid(outarg.nodeid) || !valid_mode(outarg.attr.mode))) | |
ee4e5271 | 231 | err = -EIO; |
8cbdf1e6 | 232 | if (!err && outarg.nodeid) { |
e5e5558e | 233 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
9e6268db | 234 | &outarg.attr); |
e5e5558e | 235 | if (!inode) { |
9e6268db | 236 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
0aa7c699 | 237 | return ERR_PTR(-ENOMEM); |
e5e5558e MS |
238 | } |
239 | } | |
240 | fuse_put_request(fc, req); | |
241 | if (err && err != -ENOENT) | |
0aa7c699 | 242 | return ERR_PTR(err); |
e5e5558e | 243 | |
0aa7c699 MS |
244 | if (inode && dir_alias(inode)) { |
245 | iput(inode); | |
246 | return ERR_PTR(-EIO); | |
e5e5558e | 247 | } |
0aa7c699 | 248 | d_add(entry, inode); |
e5e5558e | 249 | entry->d_op = &fuse_dentry_operations; |
8cbdf1e6 | 250 | if (!err) |
0aa7c699 | 251 | fuse_change_timeout(entry, &outarg); |
8cbdf1e6 MS |
252 | else |
253 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 | 254 | return NULL; |
e5e5558e MS |
255 | } |
256 | ||
51eb01e7 MS |
257 | /* |
258 | * Synchronous release for the case when something goes wrong in CREATE_OPEN | |
259 | */ | |
260 | static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff, | |
261 | u64 nodeid, int flags) | |
262 | { | |
263 | struct fuse_req *req; | |
264 | ||
265 | req = fuse_release_fill(ff, nodeid, flags, FUSE_RELEASE); | |
266 | req->force = 1; | |
267 | request_send(fc, req); | |
268 | fuse_put_request(fc, req); | |
269 | } | |
270 | ||
6f9f1180 MS |
271 | /* |
272 | * Atomic create+open operation | |
273 | * | |
274 | * If the filesystem doesn't support this, then fall back to separate | |
275 | * 'mknod' + 'open' requests. | |
276 | */ | |
fd72faac MS |
277 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, |
278 | struct nameidata *nd) | |
279 | { | |
280 | int err; | |
281 | struct inode *inode; | |
282 | struct fuse_conn *fc = get_fuse_conn(dir); | |
283 | struct fuse_req *req; | |
51eb01e7 | 284 | struct fuse_req *forget_req; |
fd72faac MS |
285 | struct fuse_open_in inarg; |
286 | struct fuse_open_out outopen; | |
287 | struct fuse_entry_out outentry; | |
fd72faac MS |
288 | struct fuse_file *ff; |
289 | struct file *file; | |
290 | int flags = nd->intent.open.flags - 1; | |
291 | ||
fd72faac | 292 | if (fc->no_create) |
ce1d5a49 | 293 | return -ENOSYS; |
fd72faac | 294 | |
51eb01e7 MS |
295 | forget_req = fuse_get_req(fc); |
296 | if (IS_ERR(forget_req)) | |
297 | return PTR_ERR(forget_req); | |
298 | ||
ce1d5a49 | 299 | req = fuse_get_req(fc); |
51eb01e7 | 300 | err = PTR_ERR(req); |
ce1d5a49 | 301 | if (IS_ERR(req)) |
51eb01e7 | 302 | goto out_put_forget_req; |
fd72faac | 303 | |
ce1d5a49 | 304 | err = -ENOMEM; |
fd72faac MS |
305 | ff = fuse_file_alloc(); |
306 | if (!ff) | |
307 | goto out_put_request; | |
308 | ||
309 | flags &= ~O_NOCTTY; | |
310 | memset(&inarg, 0, sizeof(inarg)); | |
311 | inarg.flags = flags; | |
312 | inarg.mode = mode; | |
313 | req->in.h.opcode = FUSE_CREATE; | |
314 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac MS |
315 | req->in.numargs = 2; |
316 | req->in.args[0].size = sizeof(inarg); | |
317 | req->in.args[0].value = &inarg; | |
318 | req->in.args[1].size = entry->d_name.len + 1; | |
319 | req->in.args[1].value = entry->d_name.name; | |
320 | req->out.numargs = 2; | |
321 | req->out.args[0].size = sizeof(outentry); | |
322 | req->out.args[0].value = &outentry; | |
323 | req->out.args[1].size = sizeof(outopen); | |
324 | req->out.args[1].value = &outopen; | |
325 | request_send(fc, req); | |
326 | err = req->out.h.error; | |
327 | if (err) { | |
328 | if (err == -ENOSYS) | |
329 | fc->no_create = 1; | |
330 | goto out_free_ff; | |
331 | } | |
332 | ||
333 | err = -EIO; | |
2827d0b2 | 334 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
335 | goto out_free_ff; |
336 | ||
51eb01e7 | 337 | fuse_put_request(fc, req); |
fd72faac MS |
338 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
339 | &outentry.attr); | |
fd72faac MS |
340 | if (!inode) { |
341 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
342 | ff->fh = outopen.fh; | |
51eb01e7 MS |
343 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
344 | fuse_send_forget(fc, forget_req, outentry.nodeid, 1); | |
345 | return -ENOMEM; | |
fd72faac | 346 | } |
51eb01e7 | 347 | fuse_put_request(fc, forget_req); |
fd72faac | 348 | d_instantiate(entry, inode); |
0aa7c699 | 349 | fuse_change_timeout(entry, &outentry); |
fd72faac MS |
350 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
351 | if (IS_ERR(file)) { | |
352 | ff->fh = outopen.fh; | |
51eb01e7 | 353 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
fd72faac MS |
354 | return PTR_ERR(file); |
355 | } | |
356 | fuse_finish_open(inode, file, ff, &outopen); | |
357 | return 0; | |
358 | ||
359 | out_free_ff: | |
360 | fuse_file_free(ff); | |
361 | out_put_request: | |
362 | fuse_put_request(fc, req); | |
51eb01e7 MS |
363 | out_put_forget_req: |
364 | fuse_put_request(fc, forget_req); | |
fd72faac MS |
365 | return err; |
366 | } | |
367 | ||
6f9f1180 MS |
368 | /* |
369 | * Code shared between mknod, mkdir, symlink and link | |
370 | */ | |
9e6268db MS |
371 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
372 | struct inode *dir, struct dentry *entry, | |
373 | int mode) | |
374 | { | |
375 | struct fuse_entry_out outarg; | |
376 | struct inode *inode; | |
9e6268db MS |
377 | int err; |
378 | ||
379 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
380 | req->out.numargs = 1; |
381 | req->out.args[0].size = sizeof(outarg); | |
382 | req->out.args[0].value = &outarg; | |
383 | request_send(fc, req); | |
384 | err = req->out.h.error; | |
385 | if (err) { | |
386 | fuse_put_request(fc, req); | |
387 | return err; | |
388 | } | |
39ee059a MS |
389 | err = -EIO; |
390 | if (invalid_nodeid(outarg.nodeid)) | |
391 | goto out_put_request; | |
392 | ||
393 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
394 | goto out_put_request; | |
395 | ||
9e6268db MS |
396 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
397 | &outarg.attr); | |
398 | if (!inode) { | |
399 | fuse_send_forget(fc, req, outarg.nodeid, 1); | |
400 | return -ENOMEM; | |
401 | } | |
402 | fuse_put_request(fc, req); | |
403 | ||
39ee059a | 404 | if (dir_alias(inode)) { |
9e6268db MS |
405 | iput(inode); |
406 | return -EIO; | |
407 | } | |
408 | ||
9e6268db | 409 | d_instantiate(entry, inode); |
0aa7c699 | 410 | fuse_change_timeout(entry, &outarg); |
9e6268db MS |
411 | fuse_invalidate_attr(dir); |
412 | return 0; | |
39ee059a MS |
413 | |
414 | out_put_request: | |
415 | fuse_put_request(fc, req); | |
416 | return err; | |
9e6268db MS |
417 | } |
418 | ||
419 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
420 | dev_t rdev) | |
421 | { | |
422 | struct fuse_mknod_in inarg; | |
423 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
424 | struct fuse_req *req = fuse_get_req(fc); |
425 | if (IS_ERR(req)) | |
426 | return PTR_ERR(req); | |
9e6268db MS |
427 | |
428 | memset(&inarg, 0, sizeof(inarg)); | |
429 | inarg.mode = mode; | |
430 | inarg.rdev = new_encode_dev(rdev); | |
431 | req->in.h.opcode = FUSE_MKNOD; | |
432 | req->in.numargs = 2; | |
433 | req->in.args[0].size = sizeof(inarg); | |
434 | req->in.args[0].value = &inarg; | |
435 | req->in.args[1].size = entry->d_name.len + 1; | |
436 | req->in.args[1].value = entry->d_name.name; | |
437 | return create_new_entry(fc, req, dir, entry, mode); | |
438 | } | |
439 | ||
440 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
441 | struct nameidata *nd) | |
442 | { | |
fd72faac MS |
443 | if (nd && (nd->flags & LOOKUP_CREATE)) { |
444 | int err = fuse_create_open(dir, entry, mode, nd); | |
445 | if (err != -ENOSYS) | |
446 | return err; | |
447 | /* Fall back on mknod */ | |
448 | } | |
9e6268db MS |
449 | return fuse_mknod(dir, entry, mode, 0); |
450 | } | |
451 | ||
452 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
453 | { | |
454 | struct fuse_mkdir_in inarg; | |
455 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
456 | struct fuse_req *req = fuse_get_req(fc); |
457 | if (IS_ERR(req)) | |
458 | return PTR_ERR(req); | |
9e6268db MS |
459 | |
460 | memset(&inarg, 0, sizeof(inarg)); | |
461 | inarg.mode = mode; | |
462 | req->in.h.opcode = FUSE_MKDIR; | |
463 | req->in.numargs = 2; | |
464 | req->in.args[0].size = sizeof(inarg); | |
465 | req->in.args[0].value = &inarg; | |
466 | req->in.args[1].size = entry->d_name.len + 1; | |
467 | req->in.args[1].value = entry->d_name.name; | |
468 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
469 | } | |
470 | ||
471 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
472 | const char *link) | |
473 | { | |
474 | struct fuse_conn *fc = get_fuse_conn(dir); | |
475 | unsigned len = strlen(link) + 1; | |
ce1d5a49 MS |
476 | struct fuse_req *req = fuse_get_req(fc); |
477 | if (IS_ERR(req)) | |
478 | return PTR_ERR(req); | |
9e6268db MS |
479 | |
480 | req->in.h.opcode = FUSE_SYMLINK; | |
481 | req->in.numargs = 2; | |
482 | req->in.args[0].size = entry->d_name.len + 1; | |
483 | req->in.args[0].value = entry->d_name.name; | |
484 | req->in.args[1].size = len; | |
485 | req->in.args[1].value = link; | |
486 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
487 | } | |
488 | ||
489 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
490 | { | |
491 | int err; | |
492 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
493 | struct fuse_req *req = fuse_get_req(fc); |
494 | if (IS_ERR(req)) | |
495 | return PTR_ERR(req); | |
9e6268db MS |
496 | |
497 | req->in.h.opcode = FUSE_UNLINK; | |
498 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
499 | req->in.numargs = 1; |
500 | req->in.args[0].size = entry->d_name.len + 1; | |
501 | req->in.args[0].value = entry->d_name.name; | |
502 | request_send(fc, req); | |
503 | err = req->out.h.error; | |
504 | fuse_put_request(fc, req); | |
505 | if (!err) { | |
506 | struct inode *inode = entry->d_inode; | |
507 | ||
508 | /* Set nlink to zero so the inode can be cleared, if | |
509 | the inode does have more links this will be | |
510 | discovered at the next lookup/getattr */ | |
ce71ec36 | 511 | clear_nlink(inode); |
9e6268db MS |
512 | fuse_invalidate_attr(inode); |
513 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 514 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
515 | } else if (err == -EINTR) |
516 | fuse_invalidate_entry(entry); | |
517 | return err; | |
518 | } | |
519 | ||
520 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
521 | { | |
522 | int err; | |
523 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
524 | struct fuse_req *req = fuse_get_req(fc); |
525 | if (IS_ERR(req)) | |
526 | return PTR_ERR(req); | |
9e6268db MS |
527 | |
528 | req->in.h.opcode = FUSE_RMDIR; | |
529 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
530 | req->in.numargs = 1; |
531 | req->in.args[0].size = entry->d_name.len + 1; | |
532 | req->in.args[0].value = entry->d_name.name; | |
533 | request_send(fc, req); | |
534 | err = req->out.h.error; | |
535 | fuse_put_request(fc, req); | |
536 | if (!err) { | |
ce71ec36 | 537 | clear_nlink(entry->d_inode); |
9e6268db | 538 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 539 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
540 | } else if (err == -EINTR) |
541 | fuse_invalidate_entry(entry); | |
542 | return err; | |
543 | } | |
544 | ||
545 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
546 | struct inode *newdir, struct dentry *newent) | |
547 | { | |
548 | int err; | |
549 | struct fuse_rename_in inarg; | |
550 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 MS |
551 | struct fuse_req *req = fuse_get_req(fc); |
552 | if (IS_ERR(req)) | |
553 | return PTR_ERR(req); | |
9e6268db MS |
554 | |
555 | memset(&inarg, 0, sizeof(inarg)); | |
556 | inarg.newdir = get_node_id(newdir); | |
557 | req->in.h.opcode = FUSE_RENAME; | |
558 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
559 | req->in.numargs = 3; |
560 | req->in.args[0].size = sizeof(inarg); | |
561 | req->in.args[0].value = &inarg; | |
562 | req->in.args[1].size = oldent->d_name.len + 1; | |
563 | req->in.args[1].value = oldent->d_name.name; | |
564 | req->in.args[2].size = newent->d_name.len + 1; | |
565 | req->in.args[2].value = newent->d_name.name; | |
566 | request_send(fc, req); | |
567 | err = req->out.h.error; | |
568 | fuse_put_request(fc, req); | |
569 | if (!err) { | |
570 | fuse_invalidate_attr(olddir); | |
571 | if (olddir != newdir) | |
572 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
573 | |
574 | /* newent will end up negative */ | |
575 | if (newent->d_inode) | |
576 | fuse_invalidate_entry_cache(newent); | |
9e6268db MS |
577 | } else if (err == -EINTR) { |
578 | /* If request was interrupted, DEITY only knows if the | |
579 | rename actually took place. If the invalidation | |
580 | fails (e.g. some process has CWD under the renamed | |
581 | directory), then there can be inconsistency between | |
582 | the dcache and the real filesystem. Tough luck. */ | |
583 | fuse_invalidate_entry(oldent); | |
584 | if (newent->d_inode) | |
585 | fuse_invalidate_entry(newent); | |
586 | } | |
587 | ||
588 | return err; | |
589 | } | |
590 | ||
591 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
592 | struct dentry *newent) | |
593 | { | |
594 | int err; | |
595 | struct fuse_link_in inarg; | |
596 | struct inode *inode = entry->d_inode; | |
597 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
598 | struct fuse_req *req = fuse_get_req(fc); |
599 | if (IS_ERR(req)) | |
600 | return PTR_ERR(req); | |
9e6268db MS |
601 | |
602 | memset(&inarg, 0, sizeof(inarg)); | |
603 | inarg.oldnodeid = get_node_id(inode); | |
604 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
605 | req->in.numargs = 2; |
606 | req->in.args[0].size = sizeof(inarg); | |
607 | req->in.args[0].value = &inarg; | |
608 | req->in.args[1].size = newent->d_name.len + 1; | |
609 | req->in.args[1].value = newent->d_name.name; | |
610 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
611 | /* Contrary to "normal" filesystems it can happen that link | |
612 | makes two "logical" inodes point to the same "physical" | |
613 | inode. We invalidate the attributes of the old one, so it | |
614 | will reflect changes in the backing inode (link count, | |
615 | etc.) | |
616 | */ | |
617 | if (!err || err == -EINTR) | |
618 | fuse_invalidate_attr(inode); | |
619 | return err; | |
620 | } | |
621 | ||
e5e5558e MS |
622 | int fuse_do_getattr(struct inode *inode) |
623 | { | |
624 | int err; | |
625 | struct fuse_attr_out arg; | |
626 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
627 | struct fuse_req *req = fuse_get_req(fc); |
628 | if (IS_ERR(req)) | |
629 | return PTR_ERR(req); | |
e5e5558e MS |
630 | |
631 | req->in.h.opcode = FUSE_GETATTR; | |
632 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
633 | req->out.numargs = 1; |
634 | req->out.args[0].size = sizeof(arg); | |
635 | req->out.args[0].value = &arg; | |
636 | request_send(fc, req); | |
637 | err = req->out.h.error; | |
638 | fuse_put_request(fc, req); | |
639 | if (!err) { | |
640 | if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) { | |
641 | make_bad_inode(inode); | |
642 | err = -EIO; | |
643 | } else { | |
644 | struct fuse_inode *fi = get_fuse_inode(inode); | |
645 | fuse_change_attributes(inode, &arg.attr); | |
646 | fi->i_time = time_to_jiffies(arg.attr_valid, | |
647 | arg.attr_valid_nsec); | |
648 | } | |
649 | } | |
650 | return err; | |
651 | } | |
652 | ||
87729a55 MS |
653 | /* |
654 | * Calling into a user-controlled filesystem gives the filesystem | |
655 | * daemon ptrace-like capabilities over the requester process. This | |
656 | * means, that the filesystem daemon is able to record the exact | |
657 | * filesystem operations performed, and can also control the behavior | |
658 | * of the requester process in otherwise impossible ways. For example | |
659 | * it can delay the operation for arbitrary length of time allowing | |
660 | * DoS against the requester. | |
661 | * | |
662 | * For this reason only those processes can call into the filesystem, | |
663 | * for which the owner of the mount has ptrace privilege. This | |
664 | * excludes processes started by other users, suid or sgid processes. | |
665 | */ | |
666 | static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) | |
667 | { | |
668 | if (fc->flags & FUSE_ALLOW_OTHER) | |
669 | return 1; | |
670 | ||
671 | if (task->euid == fc->user_id && | |
672 | task->suid == fc->user_id && | |
673 | task->uid == fc->user_id && | |
674 | task->egid == fc->group_id && | |
675 | task->sgid == fc->group_id && | |
676 | task->gid == fc->group_id) | |
677 | return 1; | |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
6f9f1180 MS |
682 | /* |
683 | * Check whether the inode attributes are still valid | |
684 | * | |
685 | * If the attribute validity timeout has expired, then fetch the fresh | |
686 | * attributes with a 'getattr' request | |
687 | * | |
688 | * I'm not sure why cached attributes are never returned for the root | |
689 | * inode, this is probably being too cautious. | |
690 | */ | |
e5e5558e MS |
691 | static int fuse_revalidate(struct dentry *entry) |
692 | { | |
693 | struct inode *inode = entry->d_inode; | |
694 | struct fuse_inode *fi = get_fuse_inode(inode); | |
695 | struct fuse_conn *fc = get_fuse_conn(inode); | |
696 | ||
87729a55 MS |
697 | if (!fuse_allow_task(fc, current)) |
698 | return -EACCES; | |
699 | if (get_node_id(inode) != FUSE_ROOT_ID && | |
0a0898cf | 700 | fi->i_time >= get_jiffies_64()) |
e5e5558e MS |
701 | return 0; |
702 | ||
703 | return fuse_do_getattr(inode); | |
704 | } | |
705 | ||
31d40d74 MS |
706 | static int fuse_access(struct inode *inode, int mask) |
707 | { | |
708 | struct fuse_conn *fc = get_fuse_conn(inode); | |
709 | struct fuse_req *req; | |
710 | struct fuse_access_in inarg; | |
711 | int err; | |
712 | ||
713 | if (fc->no_access) | |
714 | return 0; | |
715 | ||
ce1d5a49 MS |
716 | req = fuse_get_req(fc); |
717 | if (IS_ERR(req)) | |
718 | return PTR_ERR(req); | |
31d40d74 MS |
719 | |
720 | memset(&inarg, 0, sizeof(inarg)); | |
721 | inarg.mask = mask; | |
722 | req->in.h.opcode = FUSE_ACCESS; | |
723 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
724 | req->in.numargs = 1; |
725 | req->in.args[0].size = sizeof(inarg); | |
726 | req->in.args[0].value = &inarg; | |
727 | request_send(fc, req); | |
728 | err = req->out.h.error; | |
729 | fuse_put_request(fc, req); | |
730 | if (err == -ENOSYS) { | |
731 | fc->no_access = 1; | |
732 | err = 0; | |
733 | } | |
734 | return err; | |
735 | } | |
736 | ||
6f9f1180 MS |
737 | /* |
738 | * Check permission. The two basic access models of FUSE are: | |
739 | * | |
740 | * 1) Local access checking ('default_permissions' mount option) based | |
741 | * on file mode. This is the plain old disk filesystem permission | |
742 | * modell. | |
743 | * | |
744 | * 2) "Remote" access checking, where server is responsible for | |
745 | * checking permission in each inode operation. An exception to this | |
746 | * is if ->permission() was invoked from sys_access() in which case an | |
747 | * access request is sent. Execute permission is still checked | |
748 | * locally based on file mode. | |
749 | */ | |
e5e5558e MS |
750 | static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) |
751 | { | |
752 | struct fuse_conn *fc = get_fuse_conn(inode); | |
753 | ||
87729a55 | 754 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 755 | return -EACCES; |
1e9a4ed9 MS |
756 | else if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
757 | int err = generic_permission(inode, mask, NULL); | |
758 | ||
759 | /* If permission is denied, try to refresh file | |
760 | attributes. This is also needed, because the root | |
761 | node will at first have no permissions */ | |
762 | if (err == -EACCES) { | |
763 | err = fuse_do_getattr(inode); | |
764 | if (!err) | |
765 | err = generic_permission(inode, mask, NULL); | |
766 | } | |
767 | ||
6f9f1180 MS |
768 | /* Note: the opposite of the above test does not |
769 | exist. So if permissions are revoked this won't be | |
770 | noticed immediately, only after the attribute | |
771 | timeout has expired */ | |
1e9a4ed9 MS |
772 | |
773 | return err; | |
774 | } else { | |
e5e5558e | 775 | int mode = inode->i_mode; |
e5e5558e MS |
776 | if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO)) |
777 | return -EACCES; | |
31d40d74 | 778 | |
650a8983 | 779 | if (nd && (nd->flags & (LOOKUP_ACCESS | LOOKUP_CHDIR))) |
31d40d74 | 780 | return fuse_access(inode, mask); |
e5e5558e MS |
781 | return 0; |
782 | } | |
783 | } | |
784 | ||
785 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
786 | void *dstbuf, filldir_t filldir) | |
787 | { | |
788 | while (nbytes >= FUSE_NAME_OFFSET) { | |
789 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
790 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
791 | int over; | |
792 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
793 | return -EIO; | |
794 | if (reclen > nbytes) | |
795 | break; | |
796 | ||
797 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
798 | file->f_pos, dirent->ino, dirent->type); | |
799 | if (over) | |
800 | break; | |
801 | ||
802 | buf += reclen; | |
803 | nbytes -= reclen; | |
804 | file->f_pos = dirent->off; | |
805 | } | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
04730fef | 810 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 811 | { |
04730fef MS |
812 | int err; |
813 | size_t nbytes; | |
814 | struct page *page; | |
e5e5558e MS |
815 | struct inode *inode = file->f_dentry->d_inode; |
816 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 MS |
817 | struct fuse_req *req; |
818 | ||
819 | if (is_bad_inode(inode)) | |
820 | return -EIO; | |
821 | ||
ce1d5a49 MS |
822 | req = fuse_get_req(fc); |
823 | if (IS_ERR(req)) | |
824 | return PTR_ERR(req); | |
e5e5558e | 825 | |
04730fef MS |
826 | page = alloc_page(GFP_KERNEL); |
827 | if (!page) { | |
828 | fuse_put_request(fc, req); | |
829 | return -ENOMEM; | |
830 | } | |
831 | req->num_pages = 1; | |
832 | req->pages[0] = page; | |
361b1eb5 MS |
833 | fuse_read_fill(req, file, inode, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
834 | request_send(fc, req); | |
835 | nbytes = req->out.args[0].size; | |
e5e5558e MS |
836 | err = req->out.h.error; |
837 | fuse_put_request(fc, req); | |
838 | if (!err) | |
04730fef MS |
839 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
840 | filldir); | |
e5e5558e | 841 | |
04730fef | 842 | __free_page(page); |
b36c31ba | 843 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 844 | return err; |
e5e5558e MS |
845 | } |
846 | ||
847 | static char *read_link(struct dentry *dentry) | |
848 | { | |
849 | struct inode *inode = dentry->d_inode; | |
850 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 851 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
852 | char *link; |
853 | ||
ce1d5a49 MS |
854 | if (IS_ERR(req)) |
855 | return ERR_PTR(PTR_ERR(req)); | |
e5e5558e MS |
856 | |
857 | link = (char *) __get_free_page(GFP_KERNEL); | |
858 | if (!link) { | |
859 | link = ERR_PTR(-ENOMEM); | |
860 | goto out; | |
861 | } | |
862 | req->in.h.opcode = FUSE_READLINK; | |
863 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
864 | req->out.argvar = 1; |
865 | req->out.numargs = 1; | |
866 | req->out.args[0].size = PAGE_SIZE - 1; | |
867 | req->out.args[0].value = link; | |
868 | request_send(fc, req); | |
869 | if (req->out.h.error) { | |
870 | free_page((unsigned long) link); | |
871 | link = ERR_PTR(req->out.h.error); | |
872 | } else | |
873 | link[req->out.args[0].size] = '\0'; | |
874 | out: | |
875 | fuse_put_request(fc, req); | |
b36c31ba | 876 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
877 | return link; |
878 | } | |
879 | ||
880 | static void free_link(char *link) | |
881 | { | |
882 | if (!IS_ERR(link)) | |
883 | free_page((unsigned long) link); | |
884 | } | |
885 | ||
886 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
887 | { | |
888 | nd_set_link(nd, read_link(dentry)); | |
889 | return NULL; | |
890 | } | |
891 | ||
892 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
893 | { | |
894 | free_link(nd_get_link(nd)); | |
895 | } | |
896 | ||
897 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
898 | { | |
04730fef | 899 | return fuse_open_common(inode, file, 1); |
e5e5558e MS |
900 | } |
901 | ||
902 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
903 | { | |
04730fef | 904 | return fuse_release_common(inode, file, 1); |
e5e5558e MS |
905 | } |
906 | ||
82547981 MS |
907 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) |
908 | { | |
909 | /* nfsd can call this with no file */ | |
910 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; | |
911 | } | |
912 | ||
befc649c | 913 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
914 | { |
915 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
916 | |
917 | if (ivalid & ATTR_MODE) | |
befc649c | 918 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 919 | if (ivalid & ATTR_UID) |
befc649c | 920 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 921 | if (ivalid & ATTR_GID) |
befc649c | 922 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 923 | if (ivalid & ATTR_SIZE) |
befc649c | 924 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
9e6268db MS |
925 | /* You can only _set_ these together (they may change by themselves) */ |
926 | if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { | |
befc649c MS |
927 | arg->valid |= FATTR_ATIME | FATTR_MTIME; |
928 | arg->atime = iattr->ia_atime.tv_sec; | |
929 | arg->mtime = iattr->ia_mtime.tv_sec; | |
930 | } | |
931 | if (ivalid & ATTR_FILE) { | |
932 | struct fuse_file *ff = iattr->ia_file->private_data; | |
933 | arg->valid |= FATTR_FH; | |
934 | arg->fh = ff->fh; | |
9e6268db | 935 | } |
9e6268db MS |
936 | } |
937 | ||
6f9f1180 MS |
938 | /* |
939 | * Set attributes, and at the same time refresh them. | |
940 | * | |
941 | * Truncation is slightly complicated, because the 'truncate' request | |
942 | * may fail, in which case we don't want to touch the mapping. | |
943 | * vmtruncate() doesn't allow for this case. So do the rlimit | |
944 | * checking by hand and call vmtruncate() only after the file has | |
945 | * actually been truncated. | |
946 | */ | |
9e6268db MS |
947 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
948 | { | |
949 | struct inode *inode = entry->d_inode; | |
950 | struct fuse_conn *fc = get_fuse_conn(inode); | |
951 | struct fuse_inode *fi = get_fuse_inode(inode); | |
952 | struct fuse_req *req; | |
953 | struct fuse_setattr_in inarg; | |
954 | struct fuse_attr_out outarg; | |
955 | int err; | |
956 | int is_truncate = 0; | |
957 | ||
1e9a4ed9 MS |
958 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
959 | err = inode_change_ok(inode, attr); | |
960 | if (err) | |
961 | return err; | |
962 | } | |
963 | ||
9e6268db MS |
964 | if (attr->ia_valid & ATTR_SIZE) { |
965 | unsigned long limit; | |
966 | is_truncate = 1; | |
967 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; | |
968 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { | |
969 | send_sig(SIGXFSZ, current, 0); | |
970 | return -EFBIG; | |
971 | } | |
972 | } | |
973 | ||
ce1d5a49 MS |
974 | req = fuse_get_req(fc); |
975 | if (IS_ERR(req)) | |
976 | return PTR_ERR(req); | |
9e6268db MS |
977 | |
978 | memset(&inarg, 0, sizeof(inarg)); | |
befc649c | 979 | iattr_to_fattr(attr, &inarg); |
9e6268db MS |
980 | req->in.h.opcode = FUSE_SETATTR; |
981 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
982 | req->in.numargs = 1; |
983 | req->in.args[0].size = sizeof(inarg); | |
984 | req->in.args[0].value = &inarg; | |
985 | req->out.numargs = 1; | |
986 | req->out.args[0].size = sizeof(outarg); | |
987 | req->out.args[0].value = &outarg; | |
988 | request_send(fc, req); | |
989 | err = req->out.h.error; | |
990 | fuse_put_request(fc, req); | |
991 | if (!err) { | |
992 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
993 | make_bad_inode(inode); | |
994 | err = -EIO; | |
995 | } else { | |
996 | if (is_truncate) { | |
997 | loff_t origsize = i_size_read(inode); | |
998 | i_size_write(inode, outarg.attr.size); | |
999 | if (origsize > outarg.attr.size) | |
1000 | vmtruncate(inode, outarg.attr.size); | |
1001 | } | |
1002 | fuse_change_attributes(inode, &outarg.attr); | |
1003 | fi->i_time = time_to_jiffies(outarg.attr_valid, | |
1004 | outarg.attr_valid_nsec); | |
1005 | } | |
1006 | } else if (err == -EINTR) | |
1007 | fuse_invalidate_attr(inode); | |
1008 | ||
1009 | return err; | |
1010 | } | |
1011 | ||
e5e5558e MS |
1012 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1013 | struct kstat *stat) | |
1014 | { | |
1015 | struct inode *inode = entry->d_inode; | |
1016 | int err = fuse_revalidate(entry); | |
1017 | if (!err) | |
1018 | generic_fillattr(inode, stat); | |
1019 | ||
1020 | return err; | |
1021 | } | |
1022 | ||
92a8780e MS |
1023 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1024 | const void *value, size_t size, int flags) | |
1025 | { | |
1026 | struct inode *inode = entry->d_inode; | |
1027 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1028 | struct fuse_req *req; | |
1029 | struct fuse_setxattr_in inarg; | |
1030 | int err; | |
1031 | ||
92a8780e MS |
1032 | if (fc->no_setxattr) |
1033 | return -EOPNOTSUPP; | |
1034 | ||
ce1d5a49 MS |
1035 | req = fuse_get_req(fc); |
1036 | if (IS_ERR(req)) | |
1037 | return PTR_ERR(req); | |
92a8780e MS |
1038 | |
1039 | memset(&inarg, 0, sizeof(inarg)); | |
1040 | inarg.size = size; | |
1041 | inarg.flags = flags; | |
1042 | req->in.h.opcode = FUSE_SETXATTR; | |
1043 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1044 | req->in.numargs = 3; |
1045 | req->in.args[0].size = sizeof(inarg); | |
1046 | req->in.args[0].value = &inarg; | |
1047 | req->in.args[1].size = strlen(name) + 1; | |
1048 | req->in.args[1].value = name; | |
1049 | req->in.args[2].size = size; | |
1050 | req->in.args[2].value = value; | |
1051 | request_send(fc, req); | |
1052 | err = req->out.h.error; | |
1053 | fuse_put_request(fc, req); | |
1054 | if (err == -ENOSYS) { | |
1055 | fc->no_setxattr = 1; | |
1056 | err = -EOPNOTSUPP; | |
1057 | } | |
1058 | return err; | |
1059 | } | |
1060 | ||
1061 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1062 | void *value, size_t size) | |
1063 | { | |
1064 | struct inode *inode = entry->d_inode; | |
1065 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1066 | struct fuse_req *req; | |
1067 | struct fuse_getxattr_in inarg; | |
1068 | struct fuse_getxattr_out outarg; | |
1069 | ssize_t ret; | |
1070 | ||
1071 | if (fc->no_getxattr) | |
1072 | return -EOPNOTSUPP; | |
1073 | ||
ce1d5a49 MS |
1074 | req = fuse_get_req(fc); |
1075 | if (IS_ERR(req)) | |
1076 | return PTR_ERR(req); | |
92a8780e MS |
1077 | |
1078 | memset(&inarg, 0, sizeof(inarg)); | |
1079 | inarg.size = size; | |
1080 | req->in.h.opcode = FUSE_GETXATTR; | |
1081 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1082 | req->in.numargs = 2; |
1083 | req->in.args[0].size = sizeof(inarg); | |
1084 | req->in.args[0].value = &inarg; | |
1085 | req->in.args[1].size = strlen(name) + 1; | |
1086 | req->in.args[1].value = name; | |
1087 | /* This is really two different operations rolled into one */ | |
1088 | req->out.numargs = 1; | |
1089 | if (size) { | |
1090 | req->out.argvar = 1; | |
1091 | req->out.args[0].size = size; | |
1092 | req->out.args[0].value = value; | |
1093 | } else { | |
1094 | req->out.args[0].size = sizeof(outarg); | |
1095 | req->out.args[0].value = &outarg; | |
1096 | } | |
1097 | request_send(fc, req); | |
1098 | ret = req->out.h.error; | |
1099 | if (!ret) | |
1100 | ret = size ? req->out.args[0].size : outarg.size; | |
1101 | else { | |
1102 | if (ret == -ENOSYS) { | |
1103 | fc->no_getxattr = 1; | |
1104 | ret = -EOPNOTSUPP; | |
1105 | } | |
1106 | } | |
1107 | fuse_put_request(fc, req); | |
1108 | return ret; | |
1109 | } | |
1110 | ||
1111 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1112 | { | |
1113 | struct inode *inode = entry->d_inode; | |
1114 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1115 | struct fuse_req *req; | |
1116 | struct fuse_getxattr_in inarg; | |
1117 | struct fuse_getxattr_out outarg; | |
1118 | ssize_t ret; | |
1119 | ||
1120 | if (fc->no_listxattr) | |
1121 | return -EOPNOTSUPP; | |
1122 | ||
ce1d5a49 MS |
1123 | req = fuse_get_req(fc); |
1124 | if (IS_ERR(req)) | |
1125 | return PTR_ERR(req); | |
92a8780e MS |
1126 | |
1127 | memset(&inarg, 0, sizeof(inarg)); | |
1128 | inarg.size = size; | |
1129 | req->in.h.opcode = FUSE_LISTXATTR; | |
1130 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1131 | req->in.numargs = 1; |
1132 | req->in.args[0].size = sizeof(inarg); | |
1133 | req->in.args[0].value = &inarg; | |
1134 | /* This is really two different operations rolled into one */ | |
1135 | req->out.numargs = 1; | |
1136 | if (size) { | |
1137 | req->out.argvar = 1; | |
1138 | req->out.args[0].size = size; | |
1139 | req->out.args[0].value = list; | |
1140 | } else { | |
1141 | req->out.args[0].size = sizeof(outarg); | |
1142 | req->out.args[0].value = &outarg; | |
1143 | } | |
1144 | request_send(fc, req); | |
1145 | ret = req->out.h.error; | |
1146 | if (!ret) | |
1147 | ret = size ? req->out.args[0].size : outarg.size; | |
1148 | else { | |
1149 | if (ret == -ENOSYS) { | |
1150 | fc->no_listxattr = 1; | |
1151 | ret = -EOPNOTSUPP; | |
1152 | } | |
1153 | } | |
1154 | fuse_put_request(fc, req); | |
1155 | return ret; | |
1156 | } | |
1157 | ||
1158 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1159 | { | |
1160 | struct inode *inode = entry->d_inode; | |
1161 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1162 | struct fuse_req *req; | |
1163 | int err; | |
1164 | ||
1165 | if (fc->no_removexattr) | |
1166 | return -EOPNOTSUPP; | |
1167 | ||
ce1d5a49 MS |
1168 | req = fuse_get_req(fc); |
1169 | if (IS_ERR(req)) | |
1170 | return PTR_ERR(req); | |
92a8780e MS |
1171 | |
1172 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1173 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1174 | req->in.numargs = 1; |
1175 | req->in.args[0].size = strlen(name) + 1; | |
1176 | req->in.args[0].value = name; | |
1177 | request_send(fc, req); | |
1178 | err = req->out.h.error; | |
1179 | fuse_put_request(fc, req); | |
1180 | if (err == -ENOSYS) { | |
1181 | fc->no_removexattr = 1; | |
1182 | err = -EOPNOTSUPP; | |
1183 | } | |
1184 | return err; | |
1185 | } | |
1186 | ||
e5e5558e MS |
1187 | static struct inode_operations fuse_dir_inode_operations = { |
1188 | .lookup = fuse_lookup, | |
9e6268db MS |
1189 | .mkdir = fuse_mkdir, |
1190 | .symlink = fuse_symlink, | |
1191 | .unlink = fuse_unlink, | |
1192 | .rmdir = fuse_rmdir, | |
1193 | .rename = fuse_rename, | |
1194 | .link = fuse_link, | |
1195 | .setattr = fuse_setattr, | |
1196 | .create = fuse_create, | |
1197 | .mknod = fuse_mknod, | |
e5e5558e MS |
1198 | .permission = fuse_permission, |
1199 | .getattr = fuse_getattr, | |
92a8780e MS |
1200 | .setxattr = fuse_setxattr, |
1201 | .getxattr = fuse_getxattr, | |
1202 | .listxattr = fuse_listxattr, | |
1203 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1204 | }; |
1205 | ||
4b6f5d20 | 1206 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1207 | .llseek = generic_file_llseek, |
e5e5558e MS |
1208 | .read = generic_read_dir, |
1209 | .readdir = fuse_readdir, | |
1210 | .open = fuse_dir_open, | |
1211 | .release = fuse_dir_release, | |
82547981 | 1212 | .fsync = fuse_dir_fsync, |
e5e5558e MS |
1213 | }; |
1214 | ||
1215 | static struct inode_operations fuse_common_inode_operations = { | |
9e6268db | 1216 | .setattr = fuse_setattr, |
e5e5558e MS |
1217 | .permission = fuse_permission, |
1218 | .getattr = fuse_getattr, | |
92a8780e MS |
1219 | .setxattr = fuse_setxattr, |
1220 | .getxattr = fuse_getxattr, | |
1221 | .listxattr = fuse_listxattr, | |
1222 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1223 | }; |
1224 | ||
1225 | static struct inode_operations fuse_symlink_inode_operations = { | |
9e6268db | 1226 | .setattr = fuse_setattr, |
e5e5558e MS |
1227 | .follow_link = fuse_follow_link, |
1228 | .put_link = fuse_put_link, | |
1229 | .readlink = generic_readlink, | |
1230 | .getattr = fuse_getattr, | |
92a8780e MS |
1231 | .setxattr = fuse_setxattr, |
1232 | .getxattr = fuse_getxattr, | |
1233 | .listxattr = fuse_listxattr, | |
1234 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1235 | }; |
1236 | ||
1237 | void fuse_init_common(struct inode *inode) | |
1238 | { | |
1239 | inode->i_op = &fuse_common_inode_operations; | |
1240 | } | |
1241 | ||
1242 | void fuse_init_dir(struct inode *inode) | |
1243 | { | |
1244 | inode->i_op = &fuse_dir_inode_operations; | |
1245 | inode->i_fop = &fuse_dir_operations; | |
1246 | } | |
1247 | ||
1248 | void fuse_init_symlink(struct inode *inode) | |
1249 | { | |
1250 | inode->i_op = &fuse_symlink_inode_operations; | |
1251 | } |