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Commit | Line | Data |
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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 | } | |
8da5ff23 | 166 | spin_lock(&fc->lock); |
9e6268db | 167 | fi->nlookup ++; |
8da5ff23 | 168 | spin_unlock(&fc->lock); |
9e6268db | 169 | } |
e5e5558e | 170 | fuse_put_request(fc, req); |
9e6268db | 171 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
172 | return 0; |
173 | ||
174 | fuse_change_attributes(inode, &outarg.attr); | |
0aa7c699 | 175 | fuse_change_timeout(entry, &outarg); |
e5e5558e MS |
176 | } |
177 | return 1; | |
178 | } | |
179 | ||
6f9f1180 MS |
180 | /* |
181 | * Check if there's already a hashed alias of this directory inode. | |
182 | * If yes, then lookup and mkdir must not create a new alias. | |
183 | */ | |
f007d5c9 MS |
184 | static int dir_alias(struct inode *inode) |
185 | { | |
186 | if (S_ISDIR(inode->i_mode)) { | |
f007d5c9 MS |
187 | struct dentry *alias = d_find_alias(inode); |
188 | if (alias) { | |
189 | dput(alias); | |
190 | return 1; | |
191 | } | |
192 | } | |
193 | return 0; | |
194 | } | |
195 | ||
8bfc016d | 196 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
197 | { |
198 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
199 | } | |
200 | ||
e5e5558e MS |
201 | static struct dentry_operations fuse_dentry_operations = { |
202 | .d_revalidate = fuse_dentry_revalidate, | |
203 | }; | |
204 | ||
8bfc016d | 205 | static int valid_mode(int m) |
39ee059a MS |
206 | { |
207 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
208 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
209 | } | |
210 | ||
0aa7c699 MS |
211 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
212 | struct nameidata *nd) | |
e5e5558e MS |
213 | { |
214 | int err; | |
e5e5558e MS |
215 | struct fuse_entry_out outarg; |
216 | struct inode *inode = NULL; | |
217 | struct fuse_conn *fc = get_fuse_conn(dir); | |
218 | struct fuse_req *req; | |
219 | ||
220 | if (entry->d_name.len > FUSE_NAME_MAX) | |
0aa7c699 | 221 | return ERR_PTR(-ENAMETOOLONG); |
e5e5558e | 222 | |
ce1d5a49 MS |
223 | req = fuse_get_req(fc); |
224 | if (IS_ERR(req)) | |
225 | return ERR_PTR(PTR_ERR(req)); | |
e5e5558e MS |
226 | |
227 | fuse_lookup_init(req, dir, entry, &outarg); | |
228 | request_send(fc, req); | |
e5e5558e | 229 | err = req->out.h.error; |
50322fe7 MS |
230 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
231 | if (!err && outarg.nodeid && | |
232 | (invalid_nodeid(outarg.nodeid) || !valid_mode(outarg.attr.mode))) | |
ee4e5271 | 233 | err = -EIO; |
8cbdf1e6 | 234 | if (!err && outarg.nodeid) { |
e5e5558e | 235 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
9e6268db | 236 | &outarg.attr); |
e5e5558e | 237 | if (!inode) { |
9e6268db | 238 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
0aa7c699 | 239 | return ERR_PTR(-ENOMEM); |
e5e5558e MS |
240 | } |
241 | } | |
242 | fuse_put_request(fc, req); | |
243 | if (err && err != -ENOENT) | |
0aa7c699 | 244 | return ERR_PTR(err); |
e5e5558e | 245 | |
0aa7c699 MS |
246 | if (inode && dir_alias(inode)) { |
247 | iput(inode); | |
248 | return ERR_PTR(-EIO); | |
e5e5558e | 249 | } |
0aa7c699 | 250 | d_add(entry, inode); |
e5e5558e | 251 | entry->d_op = &fuse_dentry_operations; |
8cbdf1e6 | 252 | if (!err) |
0aa7c699 | 253 | fuse_change_timeout(entry, &outarg); |
8cbdf1e6 MS |
254 | else |
255 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 | 256 | return NULL; |
e5e5558e MS |
257 | } |
258 | ||
51eb01e7 MS |
259 | /* |
260 | * Synchronous release for the case when something goes wrong in CREATE_OPEN | |
261 | */ | |
262 | static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff, | |
263 | u64 nodeid, int flags) | |
264 | { | |
265 | struct fuse_req *req; | |
266 | ||
267 | req = fuse_release_fill(ff, nodeid, flags, FUSE_RELEASE); | |
268 | req->force = 1; | |
269 | request_send(fc, req); | |
270 | fuse_put_request(fc, req); | |
271 | } | |
272 | ||
6f9f1180 MS |
273 | /* |
274 | * Atomic create+open operation | |
275 | * | |
276 | * If the filesystem doesn't support this, then fall back to separate | |
277 | * 'mknod' + 'open' requests. | |
278 | */ | |
fd72faac MS |
279 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, |
280 | struct nameidata *nd) | |
281 | { | |
282 | int err; | |
283 | struct inode *inode; | |
284 | struct fuse_conn *fc = get_fuse_conn(dir); | |
285 | struct fuse_req *req; | |
51eb01e7 | 286 | struct fuse_req *forget_req; |
fd72faac MS |
287 | struct fuse_open_in inarg; |
288 | struct fuse_open_out outopen; | |
289 | struct fuse_entry_out outentry; | |
fd72faac MS |
290 | struct fuse_file *ff; |
291 | struct file *file; | |
292 | int flags = nd->intent.open.flags - 1; | |
293 | ||
fd72faac | 294 | if (fc->no_create) |
ce1d5a49 | 295 | return -ENOSYS; |
fd72faac | 296 | |
51eb01e7 MS |
297 | forget_req = fuse_get_req(fc); |
298 | if (IS_ERR(forget_req)) | |
299 | return PTR_ERR(forget_req); | |
300 | ||
ce1d5a49 | 301 | req = fuse_get_req(fc); |
51eb01e7 | 302 | err = PTR_ERR(req); |
ce1d5a49 | 303 | if (IS_ERR(req)) |
51eb01e7 | 304 | goto out_put_forget_req; |
fd72faac | 305 | |
ce1d5a49 | 306 | err = -ENOMEM; |
fd72faac MS |
307 | ff = fuse_file_alloc(); |
308 | if (!ff) | |
309 | goto out_put_request; | |
310 | ||
311 | flags &= ~O_NOCTTY; | |
312 | memset(&inarg, 0, sizeof(inarg)); | |
313 | inarg.flags = flags; | |
314 | inarg.mode = mode; | |
315 | req->in.h.opcode = FUSE_CREATE; | |
316 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac MS |
317 | req->in.numargs = 2; |
318 | req->in.args[0].size = sizeof(inarg); | |
319 | req->in.args[0].value = &inarg; | |
320 | req->in.args[1].size = entry->d_name.len + 1; | |
321 | req->in.args[1].value = entry->d_name.name; | |
322 | req->out.numargs = 2; | |
323 | req->out.args[0].size = sizeof(outentry); | |
324 | req->out.args[0].value = &outentry; | |
325 | req->out.args[1].size = sizeof(outopen); | |
326 | req->out.args[1].value = &outopen; | |
327 | request_send(fc, req); | |
328 | err = req->out.h.error; | |
329 | if (err) { | |
330 | if (err == -ENOSYS) | |
331 | fc->no_create = 1; | |
332 | goto out_free_ff; | |
333 | } | |
334 | ||
335 | err = -EIO; | |
2827d0b2 | 336 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
337 | goto out_free_ff; |
338 | ||
51eb01e7 | 339 | fuse_put_request(fc, req); |
fd72faac MS |
340 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
341 | &outentry.attr); | |
fd72faac MS |
342 | if (!inode) { |
343 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
344 | ff->fh = outopen.fh; | |
51eb01e7 MS |
345 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
346 | fuse_send_forget(fc, forget_req, outentry.nodeid, 1); | |
347 | return -ENOMEM; | |
fd72faac | 348 | } |
51eb01e7 | 349 | fuse_put_request(fc, forget_req); |
fd72faac | 350 | d_instantiate(entry, inode); |
0aa7c699 | 351 | fuse_change_timeout(entry, &outentry); |
fd72faac MS |
352 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
353 | if (IS_ERR(file)) { | |
354 | ff->fh = outopen.fh; | |
51eb01e7 | 355 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
fd72faac MS |
356 | return PTR_ERR(file); |
357 | } | |
358 | fuse_finish_open(inode, file, ff, &outopen); | |
359 | return 0; | |
360 | ||
361 | out_free_ff: | |
362 | fuse_file_free(ff); | |
363 | out_put_request: | |
364 | fuse_put_request(fc, req); | |
51eb01e7 MS |
365 | out_put_forget_req: |
366 | fuse_put_request(fc, forget_req); | |
fd72faac MS |
367 | return err; |
368 | } | |
369 | ||
6f9f1180 MS |
370 | /* |
371 | * Code shared between mknod, mkdir, symlink and link | |
372 | */ | |
9e6268db MS |
373 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
374 | struct inode *dir, struct dentry *entry, | |
375 | int mode) | |
376 | { | |
377 | struct fuse_entry_out outarg; | |
378 | struct inode *inode; | |
9e6268db MS |
379 | int err; |
380 | ||
381 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
382 | req->out.numargs = 1; |
383 | req->out.args[0].size = sizeof(outarg); | |
384 | req->out.args[0].value = &outarg; | |
385 | request_send(fc, req); | |
386 | err = req->out.h.error; | |
387 | if (err) { | |
388 | fuse_put_request(fc, req); | |
389 | return err; | |
390 | } | |
39ee059a MS |
391 | err = -EIO; |
392 | if (invalid_nodeid(outarg.nodeid)) | |
393 | goto out_put_request; | |
394 | ||
395 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
396 | goto out_put_request; | |
397 | ||
9e6268db MS |
398 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
399 | &outarg.attr); | |
400 | if (!inode) { | |
401 | fuse_send_forget(fc, req, outarg.nodeid, 1); | |
402 | return -ENOMEM; | |
403 | } | |
404 | fuse_put_request(fc, req); | |
405 | ||
39ee059a | 406 | if (dir_alias(inode)) { |
9e6268db MS |
407 | iput(inode); |
408 | return -EIO; | |
409 | } | |
410 | ||
9e6268db | 411 | d_instantiate(entry, inode); |
0aa7c699 | 412 | fuse_change_timeout(entry, &outarg); |
9e6268db MS |
413 | fuse_invalidate_attr(dir); |
414 | return 0; | |
39ee059a MS |
415 | |
416 | out_put_request: | |
417 | fuse_put_request(fc, req); | |
418 | return err; | |
9e6268db MS |
419 | } |
420 | ||
421 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
422 | dev_t rdev) | |
423 | { | |
424 | struct fuse_mknod_in inarg; | |
425 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
426 | struct fuse_req *req = fuse_get_req(fc); |
427 | if (IS_ERR(req)) | |
428 | return PTR_ERR(req); | |
9e6268db MS |
429 | |
430 | memset(&inarg, 0, sizeof(inarg)); | |
431 | inarg.mode = mode; | |
432 | inarg.rdev = new_encode_dev(rdev); | |
433 | req->in.h.opcode = FUSE_MKNOD; | |
434 | req->in.numargs = 2; | |
435 | req->in.args[0].size = sizeof(inarg); | |
436 | req->in.args[0].value = &inarg; | |
437 | req->in.args[1].size = entry->d_name.len + 1; | |
438 | req->in.args[1].value = entry->d_name.name; | |
439 | return create_new_entry(fc, req, dir, entry, mode); | |
440 | } | |
441 | ||
442 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
443 | struct nameidata *nd) | |
444 | { | |
fd72faac MS |
445 | if (nd && (nd->flags & LOOKUP_CREATE)) { |
446 | int err = fuse_create_open(dir, entry, mode, nd); | |
447 | if (err != -ENOSYS) | |
448 | return err; | |
449 | /* Fall back on mknod */ | |
450 | } | |
9e6268db MS |
451 | return fuse_mknod(dir, entry, mode, 0); |
452 | } | |
453 | ||
454 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
455 | { | |
456 | struct fuse_mkdir_in inarg; | |
457 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
458 | struct fuse_req *req = fuse_get_req(fc); |
459 | if (IS_ERR(req)) | |
460 | return PTR_ERR(req); | |
9e6268db MS |
461 | |
462 | memset(&inarg, 0, sizeof(inarg)); | |
463 | inarg.mode = mode; | |
464 | req->in.h.opcode = FUSE_MKDIR; | |
465 | req->in.numargs = 2; | |
466 | req->in.args[0].size = sizeof(inarg); | |
467 | req->in.args[0].value = &inarg; | |
468 | req->in.args[1].size = entry->d_name.len + 1; | |
469 | req->in.args[1].value = entry->d_name.name; | |
470 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
471 | } | |
472 | ||
473 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
474 | const char *link) | |
475 | { | |
476 | struct fuse_conn *fc = get_fuse_conn(dir); | |
477 | unsigned len = strlen(link) + 1; | |
ce1d5a49 MS |
478 | struct fuse_req *req = fuse_get_req(fc); |
479 | if (IS_ERR(req)) | |
480 | return PTR_ERR(req); | |
9e6268db MS |
481 | |
482 | req->in.h.opcode = FUSE_SYMLINK; | |
483 | req->in.numargs = 2; | |
484 | req->in.args[0].size = entry->d_name.len + 1; | |
485 | req->in.args[0].value = entry->d_name.name; | |
486 | req->in.args[1].size = len; | |
487 | req->in.args[1].value = link; | |
488 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
489 | } | |
490 | ||
491 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
492 | { | |
493 | int err; | |
494 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
495 | struct fuse_req *req = fuse_get_req(fc); |
496 | if (IS_ERR(req)) | |
497 | return PTR_ERR(req); | |
9e6268db MS |
498 | |
499 | req->in.h.opcode = FUSE_UNLINK; | |
500 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
501 | req->in.numargs = 1; |
502 | req->in.args[0].size = entry->d_name.len + 1; | |
503 | req->in.args[0].value = entry->d_name.name; | |
504 | request_send(fc, req); | |
505 | err = req->out.h.error; | |
506 | fuse_put_request(fc, req); | |
507 | if (!err) { | |
508 | struct inode *inode = entry->d_inode; | |
509 | ||
510 | /* Set nlink to zero so the inode can be cleared, if | |
511 | the inode does have more links this will be | |
512 | discovered at the next lookup/getattr */ | |
ce71ec36 | 513 | clear_nlink(inode); |
9e6268db MS |
514 | fuse_invalidate_attr(inode); |
515 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 516 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
517 | } else if (err == -EINTR) |
518 | fuse_invalidate_entry(entry); | |
519 | return err; | |
520 | } | |
521 | ||
522 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
523 | { | |
524 | int err; | |
525 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
526 | struct fuse_req *req = fuse_get_req(fc); |
527 | if (IS_ERR(req)) | |
528 | return PTR_ERR(req); | |
9e6268db MS |
529 | |
530 | req->in.h.opcode = FUSE_RMDIR; | |
531 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
532 | req->in.numargs = 1; |
533 | req->in.args[0].size = entry->d_name.len + 1; | |
534 | req->in.args[0].value = entry->d_name.name; | |
535 | request_send(fc, req); | |
536 | err = req->out.h.error; | |
537 | fuse_put_request(fc, req); | |
538 | if (!err) { | |
ce71ec36 | 539 | clear_nlink(entry->d_inode); |
9e6268db | 540 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 541 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
542 | } else if (err == -EINTR) |
543 | fuse_invalidate_entry(entry); | |
544 | return err; | |
545 | } | |
546 | ||
547 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
548 | struct inode *newdir, struct dentry *newent) | |
549 | { | |
550 | int err; | |
551 | struct fuse_rename_in inarg; | |
552 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 MS |
553 | struct fuse_req *req = fuse_get_req(fc); |
554 | if (IS_ERR(req)) | |
555 | return PTR_ERR(req); | |
9e6268db MS |
556 | |
557 | memset(&inarg, 0, sizeof(inarg)); | |
558 | inarg.newdir = get_node_id(newdir); | |
559 | req->in.h.opcode = FUSE_RENAME; | |
560 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
561 | req->in.numargs = 3; |
562 | req->in.args[0].size = sizeof(inarg); | |
563 | req->in.args[0].value = &inarg; | |
564 | req->in.args[1].size = oldent->d_name.len + 1; | |
565 | req->in.args[1].value = oldent->d_name.name; | |
566 | req->in.args[2].size = newent->d_name.len + 1; | |
567 | req->in.args[2].value = newent->d_name.name; | |
568 | request_send(fc, req); | |
569 | err = req->out.h.error; | |
570 | fuse_put_request(fc, req); | |
571 | if (!err) { | |
572 | fuse_invalidate_attr(olddir); | |
573 | if (olddir != newdir) | |
574 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
575 | |
576 | /* newent will end up negative */ | |
577 | if (newent->d_inode) | |
578 | fuse_invalidate_entry_cache(newent); | |
9e6268db MS |
579 | } else if (err == -EINTR) { |
580 | /* If request was interrupted, DEITY only knows if the | |
581 | rename actually took place. If the invalidation | |
582 | fails (e.g. some process has CWD under the renamed | |
583 | directory), then there can be inconsistency between | |
584 | the dcache and the real filesystem. Tough luck. */ | |
585 | fuse_invalidate_entry(oldent); | |
586 | if (newent->d_inode) | |
587 | fuse_invalidate_entry(newent); | |
588 | } | |
589 | ||
590 | return err; | |
591 | } | |
592 | ||
593 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
594 | struct dentry *newent) | |
595 | { | |
596 | int err; | |
597 | struct fuse_link_in inarg; | |
598 | struct inode *inode = entry->d_inode; | |
599 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
600 | struct fuse_req *req = fuse_get_req(fc); |
601 | if (IS_ERR(req)) | |
602 | return PTR_ERR(req); | |
9e6268db MS |
603 | |
604 | memset(&inarg, 0, sizeof(inarg)); | |
605 | inarg.oldnodeid = get_node_id(inode); | |
606 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
607 | req->in.numargs = 2; |
608 | req->in.args[0].size = sizeof(inarg); | |
609 | req->in.args[0].value = &inarg; | |
610 | req->in.args[1].size = newent->d_name.len + 1; | |
611 | req->in.args[1].value = newent->d_name.name; | |
612 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
613 | /* Contrary to "normal" filesystems it can happen that link | |
614 | makes two "logical" inodes point to the same "physical" | |
615 | inode. We invalidate the attributes of the old one, so it | |
616 | will reflect changes in the backing inode (link count, | |
617 | etc.) | |
618 | */ | |
619 | if (!err || err == -EINTR) | |
620 | fuse_invalidate_attr(inode); | |
621 | return err; | |
622 | } | |
623 | ||
e5e5558e MS |
624 | int fuse_do_getattr(struct inode *inode) |
625 | { | |
626 | int err; | |
627 | struct fuse_attr_out arg; | |
628 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
629 | struct fuse_req *req = fuse_get_req(fc); |
630 | if (IS_ERR(req)) | |
631 | return PTR_ERR(req); | |
e5e5558e MS |
632 | |
633 | req->in.h.opcode = FUSE_GETATTR; | |
634 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
635 | req->out.numargs = 1; |
636 | req->out.args[0].size = sizeof(arg); | |
637 | req->out.args[0].value = &arg; | |
638 | request_send(fc, req); | |
639 | err = req->out.h.error; | |
640 | fuse_put_request(fc, req); | |
641 | if (!err) { | |
642 | if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) { | |
643 | make_bad_inode(inode); | |
644 | err = -EIO; | |
645 | } else { | |
646 | struct fuse_inode *fi = get_fuse_inode(inode); | |
647 | fuse_change_attributes(inode, &arg.attr); | |
648 | fi->i_time = time_to_jiffies(arg.attr_valid, | |
649 | arg.attr_valid_nsec); | |
650 | } | |
651 | } | |
652 | return err; | |
653 | } | |
654 | ||
87729a55 MS |
655 | /* |
656 | * Calling into a user-controlled filesystem gives the filesystem | |
657 | * daemon ptrace-like capabilities over the requester process. This | |
658 | * means, that the filesystem daemon is able to record the exact | |
659 | * filesystem operations performed, and can also control the behavior | |
660 | * of the requester process in otherwise impossible ways. For example | |
661 | * it can delay the operation for arbitrary length of time allowing | |
662 | * DoS against the requester. | |
663 | * | |
664 | * For this reason only those processes can call into the filesystem, | |
665 | * for which the owner of the mount has ptrace privilege. This | |
666 | * excludes processes started by other users, suid or sgid processes. | |
667 | */ | |
668 | static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) | |
669 | { | |
670 | if (fc->flags & FUSE_ALLOW_OTHER) | |
671 | return 1; | |
672 | ||
673 | if (task->euid == fc->user_id && | |
674 | task->suid == fc->user_id && | |
675 | task->uid == fc->user_id && | |
676 | task->egid == fc->group_id && | |
677 | task->sgid == fc->group_id && | |
678 | task->gid == fc->group_id) | |
679 | return 1; | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
6f9f1180 MS |
684 | /* |
685 | * Check whether the inode attributes are still valid | |
686 | * | |
687 | * If the attribute validity timeout has expired, then fetch the fresh | |
688 | * attributes with a 'getattr' request | |
689 | * | |
690 | * I'm not sure why cached attributes are never returned for the root | |
691 | * inode, this is probably being too cautious. | |
692 | */ | |
e5e5558e MS |
693 | static int fuse_revalidate(struct dentry *entry) |
694 | { | |
695 | struct inode *inode = entry->d_inode; | |
696 | struct fuse_inode *fi = get_fuse_inode(inode); | |
697 | struct fuse_conn *fc = get_fuse_conn(inode); | |
698 | ||
87729a55 MS |
699 | if (!fuse_allow_task(fc, current)) |
700 | return -EACCES; | |
701 | if (get_node_id(inode) != FUSE_ROOT_ID && | |
0a0898cf | 702 | fi->i_time >= get_jiffies_64()) |
e5e5558e MS |
703 | return 0; |
704 | ||
705 | return fuse_do_getattr(inode); | |
706 | } | |
707 | ||
31d40d74 MS |
708 | static int fuse_access(struct inode *inode, int mask) |
709 | { | |
710 | struct fuse_conn *fc = get_fuse_conn(inode); | |
711 | struct fuse_req *req; | |
712 | struct fuse_access_in inarg; | |
713 | int err; | |
714 | ||
715 | if (fc->no_access) | |
716 | return 0; | |
717 | ||
ce1d5a49 MS |
718 | req = fuse_get_req(fc); |
719 | if (IS_ERR(req)) | |
720 | return PTR_ERR(req); | |
31d40d74 MS |
721 | |
722 | memset(&inarg, 0, sizeof(inarg)); | |
723 | inarg.mask = mask; | |
724 | req->in.h.opcode = FUSE_ACCESS; | |
725 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
726 | req->in.numargs = 1; |
727 | req->in.args[0].size = sizeof(inarg); | |
728 | req->in.args[0].value = &inarg; | |
729 | request_send(fc, req); | |
730 | err = req->out.h.error; | |
731 | fuse_put_request(fc, req); | |
732 | if (err == -ENOSYS) { | |
733 | fc->no_access = 1; | |
734 | err = 0; | |
735 | } | |
736 | return err; | |
737 | } | |
738 | ||
6f9f1180 MS |
739 | /* |
740 | * Check permission. The two basic access models of FUSE are: | |
741 | * | |
742 | * 1) Local access checking ('default_permissions' mount option) based | |
743 | * on file mode. This is the plain old disk filesystem permission | |
744 | * modell. | |
745 | * | |
746 | * 2) "Remote" access checking, where server is responsible for | |
747 | * checking permission in each inode operation. An exception to this | |
748 | * is if ->permission() was invoked from sys_access() in which case an | |
749 | * access request is sent. Execute permission is still checked | |
750 | * locally based on file mode. | |
751 | */ | |
e5e5558e MS |
752 | static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) |
753 | { | |
754 | struct fuse_conn *fc = get_fuse_conn(inode); | |
755 | ||
87729a55 | 756 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 757 | return -EACCES; |
1e9a4ed9 MS |
758 | else if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
759 | int err = generic_permission(inode, mask, NULL); | |
760 | ||
761 | /* If permission is denied, try to refresh file | |
762 | attributes. This is also needed, because the root | |
763 | node will at first have no permissions */ | |
764 | if (err == -EACCES) { | |
765 | err = fuse_do_getattr(inode); | |
766 | if (!err) | |
767 | err = generic_permission(inode, mask, NULL); | |
768 | } | |
769 | ||
6f9f1180 MS |
770 | /* Note: the opposite of the above test does not |
771 | exist. So if permissions are revoked this won't be | |
772 | noticed immediately, only after the attribute | |
773 | timeout has expired */ | |
1e9a4ed9 MS |
774 | |
775 | return err; | |
776 | } else { | |
e5e5558e | 777 | int mode = inode->i_mode; |
e5e5558e MS |
778 | if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO)) |
779 | return -EACCES; | |
31d40d74 | 780 | |
650a8983 | 781 | if (nd && (nd->flags & (LOOKUP_ACCESS | LOOKUP_CHDIR))) |
31d40d74 | 782 | return fuse_access(inode, mask); |
e5e5558e MS |
783 | return 0; |
784 | } | |
785 | } | |
786 | ||
787 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
788 | void *dstbuf, filldir_t filldir) | |
789 | { | |
790 | while (nbytes >= FUSE_NAME_OFFSET) { | |
791 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
792 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
793 | int over; | |
794 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
795 | return -EIO; | |
796 | if (reclen > nbytes) | |
797 | break; | |
798 | ||
799 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
800 | file->f_pos, dirent->ino, dirent->type); | |
801 | if (over) | |
802 | break; | |
803 | ||
804 | buf += reclen; | |
805 | nbytes -= reclen; | |
806 | file->f_pos = dirent->off; | |
807 | } | |
808 | ||
809 | return 0; | |
810 | } | |
811 | ||
04730fef | 812 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 813 | { |
04730fef MS |
814 | int err; |
815 | size_t nbytes; | |
816 | struct page *page; | |
e5e5558e MS |
817 | struct inode *inode = file->f_dentry->d_inode; |
818 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 MS |
819 | struct fuse_req *req; |
820 | ||
821 | if (is_bad_inode(inode)) | |
822 | return -EIO; | |
823 | ||
ce1d5a49 MS |
824 | req = fuse_get_req(fc); |
825 | if (IS_ERR(req)) | |
826 | return PTR_ERR(req); | |
e5e5558e | 827 | |
04730fef MS |
828 | page = alloc_page(GFP_KERNEL); |
829 | if (!page) { | |
830 | fuse_put_request(fc, req); | |
831 | return -ENOMEM; | |
832 | } | |
833 | req->num_pages = 1; | |
834 | req->pages[0] = page; | |
361b1eb5 MS |
835 | fuse_read_fill(req, file, inode, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
836 | request_send(fc, req); | |
837 | nbytes = req->out.args[0].size; | |
e5e5558e MS |
838 | err = req->out.h.error; |
839 | fuse_put_request(fc, req); | |
840 | if (!err) | |
04730fef MS |
841 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
842 | filldir); | |
e5e5558e | 843 | |
04730fef | 844 | __free_page(page); |
b36c31ba | 845 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 846 | return err; |
e5e5558e MS |
847 | } |
848 | ||
849 | static char *read_link(struct dentry *dentry) | |
850 | { | |
851 | struct inode *inode = dentry->d_inode; | |
852 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 853 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
854 | char *link; |
855 | ||
ce1d5a49 MS |
856 | if (IS_ERR(req)) |
857 | return ERR_PTR(PTR_ERR(req)); | |
e5e5558e MS |
858 | |
859 | link = (char *) __get_free_page(GFP_KERNEL); | |
860 | if (!link) { | |
861 | link = ERR_PTR(-ENOMEM); | |
862 | goto out; | |
863 | } | |
864 | req->in.h.opcode = FUSE_READLINK; | |
865 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
866 | req->out.argvar = 1; |
867 | req->out.numargs = 1; | |
868 | req->out.args[0].size = PAGE_SIZE - 1; | |
869 | req->out.args[0].value = link; | |
870 | request_send(fc, req); | |
871 | if (req->out.h.error) { | |
872 | free_page((unsigned long) link); | |
873 | link = ERR_PTR(req->out.h.error); | |
874 | } else | |
875 | link[req->out.args[0].size] = '\0'; | |
876 | out: | |
877 | fuse_put_request(fc, req); | |
b36c31ba | 878 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
879 | return link; |
880 | } | |
881 | ||
882 | static void free_link(char *link) | |
883 | { | |
884 | if (!IS_ERR(link)) | |
885 | free_page((unsigned long) link); | |
886 | } | |
887 | ||
888 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
889 | { | |
890 | nd_set_link(nd, read_link(dentry)); | |
891 | return NULL; | |
892 | } | |
893 | ||
894 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
895 | { | |
896 | free_link(nd_get_link(nd)); | |
897 | } | |
898 | ||
899 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
900 | { | |
04730fef | 901 | return fuse_open_common(inode, file, 1); |
e5e5558e MS |
902 | } |
903 | ||
904 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
905 | { | |
04730fef | 906 | return fuse_release_common(inode, file, 1); |
e5e5558e MS |
907 | } |
908 | ||
82547981 MS |
909 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) |
910 | { | |
911 | /* nfsd can call this with no file */ | |
912 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; | |
913 | } | |
914 | ||
befc649c | 915 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
916 | { |
917 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
918 | |
919 | if (ivalid & ATTR_MODE) | |
befc649c | 920 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 921 | if (ivalid & ATTR_UID) |
befc649c | 922 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 923 | if (ivalid & ATTR_GID) |
befc649c | 924 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 925 | if (ivalid & ATTR_SIZE) |
befc649c | 926 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
9e6268db MS |
927 | /* You can only _set_ these together (they may change by themselves) */ |
928 | if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { | |
befc649c MS |
929 | arg->valid |= FATTR_ATIME | FATTR_MTIME; |
930 | arg->atime = iattr->ia_atime.tv_sec; | |
931 | arg->mtime = iattr->ia_mtime.tv_sec; | |
932 | } | |
933 | if (ivalid & ATTR_FILE) { | |
934 | struct fuse_file *ff = iattr->ia_file->private_data; | |
935 | arg->valid |= FATTR_FH; | |
936 | arg->fh = ff->fh; | |
9e6268db | 937 | } |
9e6268db MS |
938 | } |
939 | ||
9ffbb916 MS |
940 | static void fuse_vmtruncate(struct inode *inode, loff_t offset) |
941 | { | |
942 | struct fuse_conn *fc = get_fuse_conn(inode); | |
943 | int need_trunc; | |
944 | ||
945 | spin_lock(&fc->lock); | |
946 | need_trunc = inode->i_size > offset; | |
947 | i_size_write(inode, offset); | |
948 | spin_unlock(&fc->lock); | |
949 | ||
950 | if (need_trunc) { | |
951 | struct address_space *mapping = inode->i_mapping; | |
952 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
953 | truncate_inode_pages(mapping, offset); | |
954 | } | |
955 | } | |
956 | ||
6f9f1180 MS |
957 | /* |
958 | * Set attributes, and at the same time refresh them. | |
959 | * | |
960 | * Truncation is slightly complicated, because the 'truncate' request | |
961 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
962 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
963 | * and the actual truncation by hand. | |
6f9f1180 | 964 | */ |
9e6268db MS |
965 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
966 | { | |
967 | struct inode *inode = entry->d_inode; | |
968 | struct fuse_conn *fc = get_fuse_conn(inode); | |
969 | struct fuse_inode *fi = get_fuse_inode(inode); | |
970 | struct fuse_req *req; | |
971 | struct fuse_setattr_in inarg; | |
972 | struct fuse_attr_out outarg; | |
973 | int err; | |
974 | int is_truncate = 0; | |
975 | ||
1e9a4ed9 MS |
976 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
977 | err = inode_change_ok(inode, attr); | |
978 | if (err) | |
979 | return err; | |
980 | } | |
981 | ||
9e6268db MS |
982 | if (attr->ia_valid & ATTR_SIZE) { |
983 | unsigned long limit; | |
984 | is_truncate = 1; | |
985 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; | |
986 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { | |
987 | send_sig(SIGXFSZ, current, 0); | |
988 | return -EFBIG; | |
989 | } | |
990 | } | |
991 | ||
ce1d5a49 MS |
992 | req = fuse_get_req(fc); |
993 | if (IS_ERR(req)) | |
994 | return PTR_ERR(req); | |
9e6268db MS |
995 | |
996 | memset(&inarg, 0, sizeof(inarg)); | |
befc649c | 997 | iattr_to_fattr(attr, &inarg); |
9e6268db MS |
998 | req->in.h.opcode = FUSE_SETATTR; |
999 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1000 | req->in.numargs = 1; |
1001 | req->in.args[0].size = sizeof(inarg); | |
1002 | req->in.args[0].value = &inarg; | |
1003 | req->out.numargs = 1; | |
1004 | req->out.args[0].size = sizeof(outarg); | |
1005 | req->out.args[0].value = &outarg; | |
1006 | request_send(fc, req); | |
1007 | err = req->out.h.error; | |
1008 | fuse_put_request(fc, req); | |
1009 | if (!err) { | |
1010 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
1011 | make_bad_inode(inode); | |
1012 | err = -EIO; | |
1013 | } else { | |
9ffbb916 MS |
1014 | if (is_truncate) |
1015 | fuse_vmtruncate(inode, outarg.attr.size); | |
9e6268db MS |
1016 | fuse_change_attributes(inode, &outarg.attr); |
1017 | fi->i_time = time_to_jiffies(outarg.attr_valid, | |
1018 | outarg.attr_valid_nsec); | |
1019 | } | |
1020 | } else if (err == -EINTR) | |
1021 | fuse_invalidate_attr(inode); | |
1022 | ||
1023 | return err; | |
1024 | } | |
1025 | ||
e5e5558e MS |
1026 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1027 | struct kstat *stat) | |
1028 | { | |
1029 | struct inode *inode = entry->d_inode; | |
1030 | int err = fuse_revalidate(entry); | |
1031 | if (!err) | |
1032 | generic_fillattr(inode, stat); | |
1033 | ||
1034 | return err; | |
1035 | } | |
1036 | ||
92a8780e MS |
1037 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1038 | const void *value, size_t size, int flags) | |
1039 | { | |
1040 | struct inode *inode = entry->d_inode; | |
1041 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1042 | struct fuse_req *req; | |
1043 | struct fuse_setxattr_in inarg; | |
1044 | int err; | |
1045 | ||
92a8780e MS |
1046 | if (fc->no_setxattr) |
1047 | return -EOPNOTSUPP; | |
1048 | ||
ce1d5a49 MS |
1049 | req = fuse_get_req(fc); |
1050 | if (IS_ERR(req)) | |
1051 | return PTR_ERR(req); | |
92a8780e MS |
1052 | |
1053 | memset(&inarg, 0, sizeof(inarg)); | |
1054 | inarg.size = size; | |
1055 | inarg.flags = flags; | |
1056 | req->in.h.opcode = FUSE_SETXATTR; | |
1057 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1058 | req->in.numargs = 3; |
1059 | req->in.args[0].size = sizeof(inarg); | |
1060 | req->in.args[0].value = &inarg; | |
1061 | req->in.args[1].size = strlen(name) + 1; | |
1062 | req->in.args[1].value = name; | |
1063 | req->in.args[2].size = size; | |
1064 | req->in.args[2].value = value; | |
1065 | request_send(fc, req); | |
1066 | err = req->out.h.error; | |
1067 | fuse_put_request(fc, req); | |
1068 | if (err == -ENOSYS) { | |
1069 | fc->no_setxattr = 1; | |
1070 | err = -EOPNOTSUPP; | |
1071 | } | |
1072 | return err; | |
1073 | } | |
1074 | ||
1075 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1076 | void *value, 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_getxattr) | |
1086 | return -EOPNOTSUPP; | |
1087 | ||
ce1d5a49 MS |
1088 | req = fuse_get_req(fc); |
1089 | if (IS_ERR(req)) | |
1090 | return PTR_ERR(req); | |
92a8780e MS |
1091 | |
1092 | memset(&inarg, 0, sizeof(inarg)); | |
1093 | inarg.size = size; | |
1094 | req->in.h.opcode = FUSE_GETXATTR; | |
1095 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1096 | req->in.numargs = 2; |
1097 | req->in.args[0].size = sizeof(inarg); | |
1098 | req->in.args[0].value = &inarg; | |
1099 | req->in.args[1].size = strlen(name) + 1; | |
1100 | req->in.args[1].value = name; | |
1101 | /* This is really two different operations rolled into one */ | |
1102 | req->out.numargs = 1; | |
1103 | if (size) { | |
1104 | req->out.argvar = 1; | |
1105 | req->out.args[0].size = size; | |
1106 | req->out.args[0].value = value; | |
1107 | } else { | |
1108 | req->out.args[0].size = sizeof(outarg); | |
1109 | req->out.args[0].value = &outarg; | |
1110 | } | |
1111 | request_send(fc, req); | |
1112 | ret = req->out.h.error; | |
1113 | if (!ret) | |
1114 | ret = size ? req->out.args[0].size : outarg.size; | |
1115 | else { | |
1116 | if (ret == -ENOSYS) { | |
1117 | fc->no_getxattr = 1; | |
1118 | ret = -EOPNOTSUPP; | |
1119 | } | |
1120 | } | |
1121 | fuse_put_request(fc, req); | |
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1126 | { | |
1127 | struct inode *inode = entry->d_inode; | |
1128 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1129 | struct fuse_req *req; | |
1130 | struct fuse_getxattr_in inarg; | |
1131 | struct fuse_getxattr_out outarg; | |
1132 | ssize_t ret; | |
1133 | ||
1134 | if (fc->no_listxattr) | |
1135 | return -EOPNOTSUPP; | |
1136 | ||
ce1d5a49 MS |
1137 | req = fuse_get_req(fc); |
1138 | if (IS_ERR(req)) | |
1139 | return PTR_ERR(req); | |
92a8780e MS |
1140 | |
1141 | memset(&inarg, 0, sizeof(inarg)); | |
1142 | inarg.size = size; | |
1143 | req->in.h.opcode = FUSE_LISTXATTR; | |
1144 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1145 | req->in.numargs = 1; |
1146 | req->in.args[0].size = sizeof(inarg); | |
1147 | req->in.args[0].value = &inarg; | |
1148 | /* This is really two different operations rolled into one */ | |
1149 | req->out.numargs = 1; | |
1150 | if (size) { | |
1151 | req->out.argvar = 1; | |
1152 | req->out.args[0].size = size; | |
1153 | req->out.args[0].value = list; | |
1154 | } else { | |
1155 | req->out.args[0].size = sizeof(outarg); | |
1156 | req->out.args[0].value = &outarg; | |
1157 | } | |
1158 | request_send(fc, req); | |
1159 | ret = req->out.h.error; | |
1160 | if (!ret) | |
1161 | ret = size ? req->out.args[0].size : outarg.size; | |
1162 | else { | |
1163 | if (ret == -ENOSYS) { | |
1164 | fc->no_listxattr = 1; | |
1165 | ret = -EOPNOTSUPP; | |
1166 | } | |
1167 | } | |
1168 | fuse_put_request(fc, req); | |
1169 | return ret; | |
1170 | } | |
1171 | ||
1172 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1173 | { | |
1174 | struct inode *inode = entry->d_inode; | |
1175 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1176 | struct fuse_req *req; | |
1177 | int err; | |
1178 | ||
1179 | if (fc->no_removexattr) | |
1180 | return -EOPNOTSUPP; | |
1181 | ||
ce1d5a49 MS |
1182 | req = fuse_get_req(fc); |
1183 | if (IS_ERR(req)) | |
1184 | return PTR_ERR(req); | |
92a8780e MS |
1185 | |
1186 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1187 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1188 | req->in.numargs = 1; |
1189 | req->in.args[0].size = strlen(name) + 1; | |
1190 | req->in.args[0].value = name; | |
1191 | request_send(fc, req); | |
1192 | err = req->out.h.error; | |
1193 | fuse_put_request(fc, req); | |
1194 | if (err == -ENOSYS) { | |
1195 | fc->no_removexattr = 1; | |
1196 | err = -EOPNOTSUPP; | |
1197 | } | |
1198 | return err; | |
1199 | } | |
1200 | ||
e5e5558e MS |
1201 | static struct inode_operations fuse_dir_inode_operations = { |
1202 | .lookup = fuse_lookup, | |
9e6268db MS |
1203 | .mkdir = fuse_mkdir, |
1204 | .symlink = fuse_symlink, | |
1205 | .unlink = fuse_unlink, | |
1206 | .rmdir = fuse_rmdir, | |
1207 | .rename = fuse_rename, | |
1208 | .link = fuse_link, | |
1209 | .setattr = fuse_setattr, | |
1210 | .create = fuse_create, | |
1211 | .mknod = fuse_mknod, | |
e5e5558e MS |
1212 | .permission = fuse_permission, |
1213 | .getattr = fuse_getattr, | |
92a8780e MS |
1214 | .setxattr = fuse_setxattr, |
1215 | .getxattr = fuse_getxattr, | |
1216 | .listxattr = fuse_listxattr, | |
1217 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1218 | }; |
1219 | ||
4b6f5d20 | 1220 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1221 | .llseek = generic_file_llseek, |
e5e5558e MS |
1222 | .read = generic_read_dir, |
1223 | .readdir = fuse_readdir, | |
1224 | .open = fuse_dir_open, | |
1225 | .release = fuse_dir_release, | |
82547981 | 1226 | .fsync = fuse_dir_fsync, |
e5e5558e MS |
1227 | }; |
1228 | ||
1229 | static struct inode_operations fuse_common_inode_operations = { | |
9e6268db | 1230 | .setattr = fuse_setattr, |
e5e5558e MS |
1231 | .permission = fuse_permission, |
1232 | .getattr = fuse_getattr, | |
92a8780e MS |
1233 | .setxattr = fuse_setxattr, |
1234 | .getxattr = fuse_getxattr, | |
1235 | .listxattr = fuse_listxattr, | |
1236 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1237 | }; |
1238 | ||
1239 | static struct inode_operations fuse_symlink_inode_operations = { | |
9e6268db | 1240 | .setattr = fuse_setattr, |
e5e5558e MS |
1241 | .follow_link = fuse_follow_link, |
1242 | .put_link = fuse_put_link, | |
1243 | .readlink = generic_readlink, | |
1244 | .getattr = fuse_getattr, | |
92a8780e MS |
1245 | .setxattr = fuse_setxattr, |
1246 | .getxattr = fuse_getxattr, | |
1247 | .listxattr = fuse_listxattr, | |
1248 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1249 | }; |
1250 | ||
1251 | void fuse_init_common(struct inode *inode) | |
1252 | { | |
1253 | inode->i_op = &fuse_common_inode_operations; | |
1254 | } | |
1255 | ||
1256 | void fuse_init_dir(struct inode *inode) | |
1257 | { | |
1258 | inode->i_op = &fuse_dir_inode_operations; | |
1259 | inode->i_fop = &fuse_dir_operations; | |
1260 | } | |
1261 | ||
1262 | void fuse_init_symlink(struct inode *inode) | |
1263 | { | |
1264 | inode->i_op = &fuse_symlink_inode_operations; | |
1265 | } |