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; | |
2d51013e | 141 | struct fuse_req *forget_req; |
e956edd0 | 142 | struct dentry *parent; |
8cbdf1e6 | 143 | |
50322fe7 | 144 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 MS |
145 | if (!inode) |
146 | return 0; | |
147 | ||
148 | fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
149 | req = fuse_get_req(fc); |
150 | if (IS_ERR(req)) | |
e5e5558e MS |
151 | return 0; |
152 | ||
2d51013e MS |
153 | forget_req = fuse_get_req(fc); |
154 | if (IS_ERR(forget_req)) { | |
155 | fuse_put_request(fc, req); | |
156 | return 0; | |
157 | } | |
158 | ||
e956edd0 MS |
159 | parent = dget_parent(entry); |
160 | fuse_lookup_init(req, parent->d_inode, entry, &outarg); | |
7c352bdf | 161 | request_send(fc, req); |
e956edd0 | 162 | dput(parent); |
e5e5558e | 163 | err = req->out.h.error; |
2d51013e | 164 | fuse_put_request(fc, req); |
50322fe7 MS |
165 | /* Zero nodeid is same as -ENOENT */ |
166 | if (!err && !outarg.nodeid) | |
167 | err = -ENOENT; | |
9e6268db | 168 | if (!err) { |
8cbdf1e6 | 169 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 170 | if (outarg.nodeid != get_node_id(inode)) { |
2d51013e MS |
171 | fuse_send_forget(fc, forget_req, |
172 | outarg.nodeid, 1); | |
9e6268db MS |
173 | return 0; |
174 | } | |
8da5ff23 | 175 | spin_lock(&fc->lock); |
9e6268db | 176 | fi->nlookup ++; |
8da5ff23 | 177 | spin_unlock(&fc->lock); |
9e6268db | 178 | } |
2d51013e | 179 | fuse_put_request(fc, forget_req); |
9e6268db | 180 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
181 | return 0; |
182 | ||
183 | fuse_change_attributes(inode, &outarg.attr); | |
0aa7c699 | 184 | fuse_change_timeout(entry, &outarg); |
e5e5558e MS |
185 | } |
186 | return 1; | |
187 | } | |
188 | ||
8bfc016d | 189 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
190 | { |
191 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
192 | } | |
193 | ||
e5e5558e MS |
194 | static struct dentry_operations fuse_dentry_operations = { |
195 | .d_revalidate = fuse_dentry_revalidate, | |
196 | }; | |
197 | ||
a5bfffac | 198 | int fuse_valid_type(int m) |
39ee059a MS |
199 | { |
200 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
201 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
202 | } | |
203 | ||
d2a85164 MS |
204 | /* |
205 | * Add a directory inode to a dentry, ensuring that no other dentry | |
206 | * refers to this inode. Called with fc->inst_mutex. | |
207 | */ | |
208 | static int fuse_d_add_directory(struct dentry *entry, struct inode *inode) | |
209 | { | |
210 | struct dentry *alias = d_find_alias(inode); | |
211 | if (alias) { | |
212 | /* This tries to shrink the subtree below alias */ | |
213 | fuse_invalidate_entry(alias); | |
214 | dput(alias); | |
215 | if (!list_empty(&inode->i_dentry)) | |
216 | return -EBUSY; | |
217 | } | |
218 | d_add(entry, inode); | |
219 | return 0; | |
220 | } | |
221 | ||
0aa7c699 MS |
222 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
223 | struct nameidata *nd) | |
e5e5558e MS |
224 | { |
225 | int err; | |
e5e5558e MS |
226 | struct fuse_entry_out outarg; |
227 | struct inode *inode = NULL; | |
228 | struct fuse_conn *fc = get_fuse_conn(dir); | |
229 | struct fuse_req *req; | |
2d51013e | 230 | struct fuse_req *forget_req; |
e5e5558e MS |
231 | |
232 | if (entry->d_name.len > FUSE_NAME_MAX) | |
0aa7c699 | 233 | return ERR_PTR(-ENAMETOOLONG); |
e5e5558e | 234 | |
ce1d5a49 MS |
235 | req = fuse_get_req(fc); |
236 | if (IS_ERR(req)) | |
237 | return ERR_PTR(PTR_ERR(req)); | |
e5e5558e | 238 | |
2d51013e MS |
239 | forget_req = fuse_get_req(fc); |
240 | if (IS_ERR(forget_req)) { | |
241 | fuse_put_request(fc, req); | |
242 | return ERR_PTR(PTR_ERR(forget_req)); | |
243 | } | |
244 | ||
e5e5558e MS |
245 | fuse_lookup_init(req, dir, entry, &outarg); |
246 | request_send(fc, req); | |
e5e5558e | 247 | err = req->out.h.error; |
2d51013e | 248 | fuse_put_request(fc, req); |
50322fe7 MS |
249 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
250 | if (!err && outarg.nodeid && | |
a5bfffac TS |
251 | (invalid_nodeid(outarg.nodeid) || |
252 | !fuse_valid_type(outarg.attr.mode))) | |
ee4e5271 | 253 | err = -EIO; |
8cbdf1e6 | 254 | if (!err && outarg.nodeid) { |
e5e5558e | 255 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
9e6268db | 256 | &outarg.attr); |
e5e5558e | 257 | if (!inode) { |
2d51013e | 258 | fuse_send_forget(fc, forget_req, outarg.nodeid, 1); |
0aa7c699 | 259 | return ERR_PTR(-ENOMEM); |
e5e5558e MS |
260 | } |
261 | } | |
2d51013e | 262 | fuse_put_request(fc, forget_req); |
e5e5558e | 263 | if (err && err != -ENOENT) |
0aa7c699 | 264 | return ERR_PTR(err); |
e5e5558e | 265 | |
d2a85164 MS |
266 | if (inode && S_ISDIR(inode->i_mode)) { |
267 | mutex_lock(&fc->inst_mutex); | |
268 | err = fuse_d_add_directory(entry, inode); | |
269 | mutex_unlock(&fc->inst_mutex); | |
270 | if (err) { | |
271 | iput(inode); | |
272 | return ERR_PTR(err); | |
273 | } | |
274 | } else | |
275 | d_add(entry, inode); | |
276 | ||
e5e5558e | 277 | entry->d_op = &fuse_dentry_operations; |
8cbdf1e6 | 278 | if (!err) |
0aa7c699 | 279 | fuse_change_timeout(entry, &outarg); |
8cbdf1e6 MS |
280 | else |
281 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 | 282 | return NULL; |
e5e5558e MS |
283 | } |
284 | ||
51eb01e7 MS |
285 | /* |
286 | * Synchronous release for the case when something goes wrong in CREATE_OPEN | |
287 | */ | |
288 | static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff, | |
289 | u64 nodeid, int flags) | |
290 | { | |
291 | struct fuse_req *req; | |
292 | ||
293 | req = fuse_release_fill(ff, nodeid, flags, FUSE_RELEASE); | |
294 | req->force = 1; | |
295 | request_send(fc, req); | |
296 | fuse_put_request(fc, req); | |
297 | } | |
298 | ||
6f9f1180 MS |
299 | /* |
300 | * Atomic create+open operation | |
301 | * | |
302 | * If the filesystem doesn't support this, then fall back to separate | |
303 | * 'mknod' + 'open' requests. | |
304 | */ | |
fd72faac MS |
305 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, |
306 | struct nameidata *nd) | |
307 | { | |
308 | int err; | |
309 | struct inode *inode; | |
310 | struct fuse_conn *fc = get_fuse_conn(dir); | |
311 | struct fuse_req *req; | |
51eb01e7 | 312 | struct fuse_req *forget_req; |
fd72faac MS |
313 | struct fuse_open_in inarg; |
314 | struct fuse_open_out outopen; | |
315 | struct fuse_entry_out outentry; | |
fd72faac MS |
316 | struct fuse_file *ff; |
317 | struct file *file; | |
318 | int flags = nd->intent.open.flags - 1; | |
319 | ||
fd72faac | 320 | if (fc->no_create) |
ce1d5a49 | 321 | return -ENOSYS; |
fd72faac | 322 | |
51eb01e7 MS |
323 | forget_req = fuse_get_req(fc); |
324 | if (IS_ERR(forget_req)) | |
325 | return PTR_ERR(forget_req); | |
326 | ||
ce1d5a49 | 327 | req = fuse_get_req(fc); |
51eb01e7 | 328 | err = PTR_ERR(req); |
ce1d5a49 | 329 | if (IS_ERR(req)) |
51eb01e7 | 330 | goto out_put_forget_req; |
fd72faac | 331 | |
ce1d5a49 | 332 | err = -ENOMEM; |
fd72faac MS |
333 | ff = fuse_file_alloc(); |
334 | if (!ff) | |
335 | goto out_put_request; | |
336 | ||
337 | flags &= ~O_NOCTTY; | |
338 | memset(&inarg, 0, sizeof(inarg)); | |
339 | inarg.flags = flags; | |
340 | inarg.mode = mode; | |
341 | req->in.h.opcode = FUSE_CREATE; | |
342 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac MS |
343 | req->in.numargs = 2; |
344 | req->in.args[0].size = sizeof(inarg); | |
345 | req->in.args[0].value = &inarg; | |
346 | req->in.args[1].size = entry->d_name.len + 1; | |
347 | req->in.args[1].value = entry->d_name.name; | |
348 | req->out.numargs = 2; | |
349 | req->out.args[0].size = sizeof(outentry); | |
350 | req->out.args[0].value = &outentry; | |
351 | req->out.args[1].size = sizeof(outopen); | |
352 | req->out.args[1].value = &outopen; | |
353 | request_send(fc, req); | |
354 | err = req->out.h.error; | |
355 | if (err) { | |
356 | if (err == -ENOSYS) | |
357 | fc->no_create = 1; | |
358 | goto out_free_ff; | |
359 | } | |
360 | ||
361 | err = -EIO; | |
2827d0b2 | 362 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
363 | goto out_free_ff; |
364 | ||
51eb01e7 | 365 | fuse_put_request(fc, req); |
fd72faac MS |
366 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
367 | &outentry.attr); | |
fd72faac MS |
368 | if (!inode) { |
369 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
370 | ff->fh = outopen.fh; | |
51eb01e7 MS |
371 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
372 | fuse_send_forget(fc, forget_req, outentry.nodeid, 1); | |
373 | return -ENOMEM; | |
fd72faac | 374 | } |
51eb01e7 | 375 | fuse_put_request(fc, forget_req); |
fd72faac | 376 | d_instantiate(entry, inode); |
0aa7c699 | 377 | fuse_change_timeout(entry, &outentry); |
fd72faac MS |
378 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
379 | if (IS_ERR(file)) { | |
380 | ff->fh = outopen.fh; | |
51eb01e7 | 381 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
fd72faac MS |
382 | return PTR_ERR(file); |
383 | } | |
384 | fuse_finish_open(inode, file, ff, &outopen); | |
385 | return 0; | |
386 | ||
387 | out_free_ff: | |
388 | fuse_file_free(ff); | |
389 | out_put_request: | |
390 | fuse_put_request(fc, req); | |
51eb01e7 MS |
391 | out_put_forget_req: |
392 | fuse_put_request(fc, forget_req); | |
fd72faac MS |
393 | return err; |
394 | } | |
395 | ||
6f9f1180 MS |
396 | /* |
397 | * Code shared between mknod, mkdir, symlink and link | |
398 | */ | |
9e6268db MS |
399 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
400 | struct inode *dir, struct dentry *entry, | |
401 | int mode) | |
402 | { | |
403 | struct fuse_entry_out outarg; | |
404 | struct inode *inode; | |
9e6268db | 405 | int err; |
2d51013e MS |
406 | struct fuse_req *forget_req; |
407 | ||
408 | forget_req = fuse_get_req(fc); | |
409 | if (IS_ERR(forget_req)) { | |
410 | fuse_put_request(fc, req); | |
411 | return PTR_ERR(forget_req); | |
412 | } | |
9e6268db MS |
413 | |
414 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
415 | req->out.numargs = 1; |
416 | req->out.args[0].size = sizeof(outarg); | |
417 | req->out.args[0].value = &outarg; | |
418 | request_send(fc, req); | |
419 | err = req->out.h.error; | |
2d51013e MS |
420 | fuse_put_request(fc, req); |
421 | if (err) | |
422 | goto out_put_forget_req; | |
423 | ||
39ee059a MS |
424 | err = -EIO; |
425 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 426 | goto out_put_forget_req; |
39ee059a MS |
427 | |
428 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 429 | goto out_put_forget_req; |
39ee059a | 430 | |
9e6268db MS |
431 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
432 | &outarg.attr); | |
433 | if (!inode) { | |
2d51013e | 434 | fuse_send_forget(fc, forget_req, outarg.nodeid, 1); |
9e6268db MS |
435 | return -ENOMEM; |
436 | } | |
2d51013e | 437 | fuse_put_request(fc, forget_req); |
9e6268db | 438 | |
d2a85164 MS |
439 | if (S_ISDIR(inode->i_mode)) { |
440 | struct dentry *alias; | |
441 | mutex_lock(&fc->inst_mutex); | |
442 | alias = d_find_alias(inode); | |
443 | if (alias) { | |
444 | /* New directory must have moved since mkdir */ | |
445 | mutex_unlock(&fc->inst_mutex); | |
446 | dput(alias); | |
447 | iput(inode); | |
448 | return -EBUSY; | |
449 | } | |
450 | d_instantiate(entry, inode); | |
451 | mutex_unlock(&fc->inst_mutex); | |
452 | } else | |
453 | d_instantiate(entry, inode); | |
9e6268db | 454 | |
0aa7c699 | 455 | fuse_change_timeout(entry, &outarg); |
9e6268db MS |
456 | fuse_invalidate_attr(dir); |
457 | return 0; | |
39ee059a | 458 | |
2d51013e MS |
459 | out_put_forget_req: |
460 | fuse_put_request(fc, forget_req); | |
39ee059a | 461 | return err; |
9e6268db MS |
462 | } |
463 | ||
464 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
465 | dev_t rdev) | |
466 | { | |
467 | struct fuse_mknod_in inarg; | |
468 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
469 | struct fuse_req *req = fuse_get_req(fc); |
470 | if (IS_ERR(req)) | |
471 | return PTR_ERR(req); | |
9e6268db MS |
472 | |
473 | memset(&inarg, 0, sizeof(inarg)); | |
474 | inarg.mode = mode; | |
475 | inarg.rdev = new_encode_dev(rdev); | |
476 | req->in.h.opcode = FUSE_MKNOD; | |
477 | req->in.numargs = 2; | |
478 | req->in.args[0].size = sizeof(inarg); | |
479 | req->in.args[0].value = &inarg; | |
480 | req->in.args[1].size = entry->d_name.len + 1; | |
481 | req->in.args[1].value = entry->d_name.name; | |
482 | return create_new_entry(fc, req, dir, entry, mode); | |
483 | } | |
484 | ||
485 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
486 | struct nameidata *nd) | |
487 | { | |
b9ba347f | 488 | if (nd && (nd->flags & LOOKUP_OPEN)) { |
fd72faac MS |
489 | int err = fuse_create_open(dir, entry, mode, nd); |
490 | if (err != -ENOSYS) | |
491 | return err; | |
492 | /* Fall back on mknod */ | |
493 | } | |
9e6268db MS |
494 | return fuse_mknod(dir, entry, mode, 0); |
495 | } | |
496 | ||
497 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
498 | { | |
499 | struct fuse_mkdir_in inarg; | |
500 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
501 | struct fuse_req *req = fuse_get_req(fc); |
502 | if (IS_ERR(req)) | |
503 | return PTR_ERR(req); | |
9e6268db MS |
504 | |
505 | memset(&inarg, 0, sizeof(inarg)); | |
506 | inarg.mode = mode; | |
507 | req->in.h.opcode = FUSE_MKDIR; | |
508 | req->in.numargs = 2; | |
509 | req->in.args[0].size = sizeof(inarg); | |
510 | req->in.args[0].value = &inarg; | |
511 | req->in.args[1].size = entry->d_name.len + 1; | |
512 | req->in.args[1].value = entry->d_name.name; | |
513 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
514 | } | |
515 | ||
516 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
517 | const char *link) | |
518 | { | |
519 | struct fuse_conn *fc = get_fuse_conn(dir); | |
520 | unsigned len = strlen(link) + 1; | |
ce1d5a49 MS |
521 | struct fuse_req *req = fuse_get_req(fc); |
522 | if (IS_ERR(req)) | |
523 | return PTR_ERR(req); | |
9e6268db MS |
524 | |
525 | req->in.h.opcode = FUSE_SYMLINK; | |
526 | req->in.numargs = 2; | |
527 | req->in.args[0].size = entry->d_name.len + 1; | |
528 | req->in.args[0].value = entry->d_name.name; | |
529 | req->in.args[1].size = len; | |
530 | req->in.args[1].value = link; | |
531 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
532 | } | |
533 | ||
534 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
535 | { | |
536 | int err; | |
537 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
538 | struct fuse_req *req = fuse_get_req(fc); |
539 | if (IS_ERR(req)) | |
540 | return PTR_ERR(req); | |
9e6268db MS |
541 | |
542 | req->in.h.opcode = FUSE_UNLINK; | |
543 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
544 | req->in.numargs = 1; |
545 | req->in.args[0].size = entry->d_name.len + 1; | |
546 | req->in.args[0].value = entry->d_name.name; | |
547 | request_send(fc, req); | |
548 | err = req->out.h.error; | |
549 | fuse_put_request(fc, req); | |
550 | if (!err) { | |
551 | struct inode *inode = entry->d_inode; | |
552 | ||
553 | /* Set nlink to zero so the inode can be cleared, if | |
554 | the inode does have more links this will be | |
555 | discovered at the next lookup/getattr */ | |
ce71ec36 | 556 | clear_nlink(inode); |
9e6268db MS |
557 | fuse_invalidate_attr(inode); |
558 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 559 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
560 | } else if (err == -EINTR) |
561 | fuse_invalidate_entry(entry); | |
562 | return err; | |
563 | } | |
564 | ||
565 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
566 | { | |
567 | int err; | |
568 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
569 | struct fuse_req *req = fuse_get_req(fc); |
570 | if (IS_ERR(req)) | |
571 | return PTR_ERR(req); | |
9e6268db MS |
572 | |
573 | req->in.h.opcode = FUSE_RMDIR; | |
574 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
575 | req->in.numargs = 1; |
576 | req->in.args[0].size = entry->d_name.len + 1; | |
577 | req->in.args[0].value = entry->d_name.name; | |
578 | request_send(fc, req); | |
579 | err = req->out.h.error; | |
580 | fuse_put_request(fc, req); | |
581 | if (!err) { | |
ce71ec36 | 582 | clear_nlink(entry->d_inode); |
9e6268db | 583 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 584 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
585 | } else if (err == -EINTR) |
586 | fuse_invalidate_entry(entry); | |
587 | return err; | |
588 | } | |
589 | ||
590 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
591 | struct inode *newdir, struct dentry *newent) | |
592 | { | |
593 | int err; | |
594 | struct fuse_rename_in inarg; | |
595 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 MS |
596 | struct fuse_req *req = fuse_get_req(fc); |
597 | if (IS_ERR(req)) | |
598 | return PTR_ERR(req); | |
9e6268db MS |
599 | |
600 | memset(&inarg, 0, sizeof(inarg)); | |
601 | inarg.newdir = get_node_id(newdir); | |
602 | req->in.h.opcode = FUSE_RENAME; | |
603 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
604 | req->in.numargs = 3; |
605 | req->in.args[0].size = sizeof(inarg); | |
606 | req->in.args[0].value = &inarg; | |
607 | req->in.args[1].size = oldent->d_name.len + 1; | |
608 | req->in.args[1].value = oldent->d_name.name; | |
609 | req->in.args[2].size = newent->d_name.len + 1; | |
610 | req->in.args[2].value = newent->d_name.name; | |
611 | request_send(fc, req); | |
612 | err = req->out.h.error; | |
613 | fuse_put_request(fc, req); | |
614 | if (!err) { | |
615 | fuse_invalidate_attr(olddir); | |
616 | if (olddir != newdir) | |
617 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
618 | |
619 | /* newent will end up negative */ | |
620 | if (newent->d_inode) | |
621 | fuse_invalidate_entry_cache(newent); | |
9e6268db MS |
622 | } else if (err == -EINTR) { |
623 | /* If request was interrupted, DEITY only knows if the | |
624 | rename actually took place. If the invalidation | |
625 | fails (e.g. some process has CWD under the renamed | |
626 | directory), then there can be inconsistency between | |
627 | the dcache and the real filesystem. Tough luck. */ | |
628 | fuse_invalidate_entry(oldent); | |
629 | if (newent->d_inode) | |
630 | fuse_invalidate_entry(newent); | |
631 | } | |
632 | ||
633 | return err; | |
634 | } | |
635 | ||
636 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
637 | struct dentry *newent) | |
638 | { | |
639 | int err; | |
640 | struct fuse_link_in inarg; | |
641 | struct inode *inode = entry->d_inode; | |
642 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
643 | struct fuse_req *req = fuse_get_req(fc); |
644 | if (IS_ERR(req)) | |
645 | return PTR_ERR(req); | |
9e6268db MS |
646 | |
647 | memset(&inarg, 0, sizeof(inarg)); | |
648 | inarg.oldnodeid = get_node_id(inode); | |
649 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
650 | req->in.numargs = 2; |
651 | req->in.args[0].size = sizeof(inarg); | |
652 | req->in.args[0].value = &inarg; | |
653 | req->in.args[1].size = newent->d_name.len + 1; | |
654 | req->in.args[1].value = newent->d_name.name; | |
655 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
656 | /* Contrary to "normal" filesystems it can happen that link | |
657 | makes two "logical" inodes point to the same "physical" | |
658 | inode. We invalidate the attributes of the old one, so it | |
659 | will reflect changes in the backing inode (link count, | |
660 | etc.) | |
661 | */ | |
662 | if (!err || err == -EINTR) | |
663 | fuse_invalidate_attr(inode); | |
664 | return err; | |
665 | } | |
666 | ||
e5e5558e MS |
667 | int fuse_do_getattr(struct inode *inode) |
668 | { | |
669 | int err; | |
670 | struct fuse_attr_out arg; | |
671 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
672 | struct fuse_req *req = fuse_get_req(fc); |
673 | if (IS_ERR(req)) | |
674 | return PTR_ERR(req); | |
e5e5558e MS |
675 | |
676 | req->in.h.opcode = FUSE_GETATTR; | |
677 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
678 | req->out.numargs = 1; |
679 | req->out.args[0].size = sizeof(arg); | |
680 | req->out.args[0].value = &arg; | |
681 | request_send(fc, req); | |
682 | err = req->out.h.error; | |
683 | fuse_put_request(fc, req); | |
684 | if (!err) { | |
685 | if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) { | |
686 | make_bad_inode(inode); | |
687 | err = -EIO; | |
688 | } else { | |
689 | struct fuse_inode *fi = get_fuse_inode(inode); | |
690 | fuse_change_attributes(inode, &arg.attr); | |
691 | fi->i_time = time_to_jiffies(arg.attr_valid, | |
692 | arg.attr_valid_nsec); | |
693 | } | |
694 | } | |
695 | return err; | |
696 | } | |
697 | ||
87729a55 MS |
698 | /* |
699 | * Calling into a user-controlled filesystem gives the filesystem | |
700 | * daemon ptrace-like capabilities over the requester process. This | |
701 | * means, that the filesystem daemon is able to record the exact | |
702 | * filesystem operations performed, and can also control the behavior | |
703 | * of the requester process in otherwise impossible ways. For example | |
704 | * it can delay the operation for arbitrary length of time allowing | |
705 | * DoS against the requester. | |
706 | * | |
707 | * For this reason only those processes can call into the filesystem, | |
708 | * for which the owner of the mount has ptrace privilege. This | |
709 | * excludes processes started by other users, suid or sgid processes. | |
710 | */ | |
711 | static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) | |
712 | { | |
713 | if (fc->flags & FUSE_ALLOW_OTHER) | |
714 | return 1; | |
715 | ||
716 | if (task->euid == fc->user_id && | |
717 | task->suid == fc->user_id && | |
718 | task->uid == fc->user_id && | |
719 | task->egid == fc->group_id && | |
720 | task->sgid == fc->group_id && | |
721 | task->gid == fc->group_id) | |
722 | return 1; | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
6f9f1180 MS |
727 | /* |
728 | * Check whether the inode attributes are still valid | |
729 | * | |
730 | * If the attribute validity timeout has expired, then fetch the fresh | |
731 | * attributes with a 'getattr' request | |
732 | * | |
733 | * I'm not sure why cached attributes are never returned for the root | |
734 | * inode, this is probably being too cautious. | |
735 | */ | |
e5e5558e MS |
736 | static int fuse_revalidate(struct dentry *entry) |
737 | { | |
738 | struct inode *inode = entry->d_inode; | |
739 | struct fuse_inode *fi = get_fuse_inode(inode); | |
740 | struct fuse_conn *fc = get_fuse_conn(inode); | |
741 | ||
87729a55 MS |
742 | if (!fuse_allow_task(fc, current)) |
743 | return -EACCES; | |
744 | if (get_node_id(inode) != FUSE_ROOT_ID && | |
0a0898cf | 745 | fi->i_time >= get_jiffies_64()) |
e5e5558e MS |
746 | return 0; |
747 | ||
748 | return fuse_do_getattr(inode); | |
749 | } | |
750 | ||
31d40d74 MS |
751 | static int fuse_access(struct inode *inode, int mask) |
752 | { | |
753 | struct fuse_conn *fc = get_fuse_conn(inode); | |
754 | struct fuse_req *req; | |
755 | struct fuse_access_in inarg; | |
756 | int err; | |
757 | ||
758 | if (fc->no_access) | |
759 | return 0; | |
760 | ||
ce1d5a49 MS |
761 | req = fuse_get_req(fc); |
762 | if (IS_ERR(req)) | |
763 | return PTR_ERR(req); | |
31d40d74 MS |
764 | |
765 | memset(&inarg, 0, sizeof(inarg)); | |
766 | inarg.mask = mask; | |
767 | req->in.h.opcode = FUSE_ACCESS; | |
768 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
769 | req->in.numargs = 1; |
770 | req->in.args[0].size = sizeof(inarg); | |
771 | req->in.args[0].value = &inarg; | |
772 | request_send(fc, req); | |
773 | err = req->out.h.error; | |
774 | fuse_put_request(fc, req); | |
775 | if (err == -ENOSYS) { | |
776 | fc->no_access = 1; | |
777 | err = 0; | |
778 | } | |
779 | return err; | |
780 | } | |
781 | ||
6f9f1180 MS |
782 | /* |
783 | * Check permission. The two basic access models of FUSE are: | |
784 | * | |
785 | * 1) Local access checking ('default_permissions' mount option) based | |
786 | * on file mode. This is the plain old disk filesystem permission | |
787 | * modell. | |
788 | * | |
789 | * 2) "Remote" access checking, where server is responsible for | |
790 | * checking permission in each inode operation. An exception to this | |
791 | * is if ->permission() was invoked from sys_access() in which case an | |
792 | * access request is sent. Execute permission is still checked | |
793 | * locally based on file mode. | |
794 | */ | |
e5e5558e MS |
795 | static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) |
796 | { | |
797 | struct fuse_conn *fc = get_fuse_conn(inode); | |
798 | ||
87729a55 | 799 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 800 | return -EACCES; |
1e9a4ed9 MS |
801 | else if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
802 | int err = generic_permission(inode, mask, NULL); | |
803 | ||
804 | /* If permission is denied, try to refresh file | |
805 | attributes. This is also needed, because the root | |
806 | node will at first have no permissions */ | |
807 | if (err == -EACCES) { | |
808 | err = fuse_do_getattr(inode); | |
809 | if (!err) | |
810 | err = generic_permission(inode, mask, NULL); | |
811 | } | |
812 | ||
6f9f1180 MS |
813 | /* Note: the opposite of the above test does not |
814 | exist. So if permissions are revoked this won't be | |
815 | noticed immediately, only after the attribute | |
816 | timeout has expired */ | |
1e9a4ed9 MS |
817 | |
818 | return err; | |
819 | } else { | |
e5e5558e | 820 | int mode = inode->i_mode; |
e5e5558e MS |
821 | if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO)) |
822 | return -EACCES; | |
31d40d74 | 823 | |
650a8983 | 824 | if (nd && (nd->flags & (LOOKUP_ACCESS | LOOKUP_CHDIR))) |
31d40d74 | 825 | return fuse_access(inode, mask); |
e5e5558e MS |
826 | return 0; |
827 | } | |
828 | } | |
829 | ||
830 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
831 | void *dstbuf, filldir_t filldir) | |
832 | { | |
833 | while (nbytes >= FUSE_NAME_OFFSET) { | |
834 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
835 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
836 | int over; | |
837 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
838 | return -EIO; | |
839 | if (reclen > nbytes) | |
840 | break; | |
841 | ||
842 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
843 | file->f_pos, dirent->ino, dirent->type); | |
844 | if (over) | |
845 | break; | |
846 | ||
847 | buf += reclen; | |
848 | nbytes -= reclen; | |
849 | file->f_pos = dirent->off; | |
850 | } | |
851 | ||
852 | return 0; | |
853 | } | |
854 | ||
04730fef | 855 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 856 | { |
04730fef MS |
857 | int err; |
858 | size_t nbytes; | |
859 | struct page *page; | |
7706a9d6 | 860 | struct inode *inode = file->f_path.dentry->d_inode; |
e5e5558e | 861 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 MS |
862 | struct fuse_req *req; |
863 | ||
864 | if (is_bad_inode(inode)) | |
865 | return -EIO; | |
866 | ||
ce1d5a49 MS |
867 | req = fuse_get_req(fc); |
868 | if (IS_ERR(req)) | |
869 | return PTR_ERR(req); | |
e5e5558e | 870 | |
04730fef MS |
871 | page = alloc_page(GFP_KERNEL); |
872 | if (!page) { | |
873 | fuse_put_request(fc, req); | |
874 | return -ENOMEM; | |
875 | } | |
876 | req->num_pages = 1; | |
877 | req->pages[0] = page; | |
361b1eb5 MS |
878 | fuse_read_fill(req, file, inode, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
879 | request_send(fc, req); | |
880 | nbytes = req->out.args[0].size; | |
e5e5558e MS |
881 | err = req->out.h.error; |
882 | fuse_put_request(fc, req); | |
883 | if (!err) | |
04730fef MS |
884 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
885 | filldir); | |
e5e5558e | 886 | |
04730fef | 887 | __free_page(page); |
b36c31ba | 888 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 889 | return err; |
e5e5558e MS |
890 | } |
891 | ||
892 | static char *read_link(struct dentry *dentry) | |
893 | { | |
894 | struct inode *inode = dentry->d_inode; | |
895 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 896 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
897 | char *link; |
898 | ||
ce1d5a49 MS |
899 | if (IS_ERR(req)) |
900 | return ERR_PTR(PTR_ERR(req)); | |
e5e5558e MS |
901 | |
902 | link = (char *) __get_free_page(GFP_KERNEL); | |
903 | if (!link) { | |
904 | link = ERR_PTR(-ENOMEM); | |
905 | goto out; | |
906 | } | |
907 | req->in.h.opcode = FUSE_READLINK; | |
908 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
909 | req->out.argvar = 1; |
910 | req->out.numargs = 1; | |
911 | req->out.args[0].size = PAGE_SIZE - 1; | |
912 | req->out.args[0].value = link; | |
913 | request_send(fc, req); | |
914 | if (req->out.h.error) { | |
915 | free_page((unsigned long) link); | |
916 | link = ERR_PTR(req->out.h.error); | |
917 | } else | |
918 | link[req->out.args[0].size] = '\0'; | |
919 | out: | |
920 | fuse_put_request(fc, req); | |
b36c31ba | 921 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
922 | return link; |
923 | } | |
924 | ||
925 | static void free_link(char *link) | |
926 | { | |
927 | if (!IS_ERR(link)) | |
928 | free_page((unsigned long) link); | |
929 | } | |
930 | ||
931 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
932 | { | |
933 | nd_set_link(nd, read_link(dentry)); | |
934 | return NULL; | |
935 | } | |
936 | ||
937 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
938 | { | |
939 | free_link(nd_get_link(nd)); | |
940 | } | |
941 | ||
942 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
943 | { | |
04730fef | 944 | return fuse_open_common(inode, file, 1); |
e5e5558e MS |
945 | } |
946 | ||
947 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
948 | { | |
04730fef | 949 | return fuse_release_common(inode, file, 1); |
e5e5558e MS |
950 | } |
951 | ||
82547981 MS |
952 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) |
953 | { | |
954 | /* nfsd can call this with no file */ | |
955 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; | |
956 | } | |
957 | ||
befc649c | 958 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
959 | { |
960 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
961 | |
962 | if (ivalid & ATTR_MODE) | |
befc649c | 963 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 964 | if (ivalid & ATTR_UID) |
befc649c | 965 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 966 | if (ivalid & ATTR_GID) |
befc649c | 967 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 968 | if (ivalid & ATTR_SIZE) |
befc649c | 969 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
9e6268db MS |
970 | /* You can only _set_ these together (they may change by themselves) */ |
971 | if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { | |
befc649c MS |
972 | arg->valid |= FATTR_ATIME | FATTR_MTIME; |
973 | arg->atime = iattr->ia_atime.tv_sec; | |
974 | arg->mtime = iattr->ia_mtime.tv_sec; | |
975 | } | |
976 | if (ivalid & ATTR_FILE) { | |
977 | struct fuse_file *ff = iattr->ia_file->private_data; | |
978 | arg->valid |= FATTR_FH; | |
979 | arg->fh = ff->fh; | |
9e6268db | 980 | } |
9e6268db MS |
981 | } |
982 | ||
9ffbb916 MS |
983 | static void fuse_vmtruncate(struct inode *inode, loff_t offset) |
984 | { | |
985 | struct fuse_conn *fc = get_fuse_conn(inode); | |
986 | int need_trunc; | |
987 | ||
988 | spin_lock(&fc->lock); | |
989 | need_trunc = inode->i_size > offset; | |
990 | i_size_write(inode, offset); | |
991 | spin_unlock(&fc->lock); | |
992 | ||
993 | if (need_trunc) { | |
994 | struct address_space *mapping = inode->i_mapping; | |
995 | unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); | |
996 | truncate_inode_pages(mapping, offset); | |
997 | } | |
998 | } | |
999 | ||
6f9f1180 MS |
1000 | /* |
1001 | * Set attributes, and at the same time refresh them. | |
1002 | * | |
1003 | * Truncation is slightly complicated, because the 'truncate' request | |
1004 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1005 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1006 | * and the actual truncation by hand. | |
6f9f1180 | 1007 | */ |
9e6268db MS |
1008 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1009 | { | |
1010 | struct inode *inode = entry->d_inode; | |
1011 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1012 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1013 | struct fuse_req *req; | |
1014 | struct fuse_setattr_in inarg; | |
1015 | struct fuse_attr_out outarg; | |
1016 | int err; | |
1017 | int is_truncate = 0; | |
1018 | ||
1e9a4ed9 MS |
1019 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
1020 | err = inode_change_ok(inode, attr); | |
1021 | if (err) | |
1022 | return err; | |
1023 | } | |
1024 | ||
9e6268db MS |
1025 | if (attr->ia_valid & ATTR_SIZE) { |
1026 | unsigned long limit; | |
1027 | is_truncate = 1; | |
b2d2272f MS |
1028 | if (IS_SWAPFILE(inode)) |
1029 | return -ETXTBSY; | |
9e6268db MS |
1030 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
1031 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { | |
1032 | send_sig(SIGXFSZ, current, 0); | |
1033 | return -EFBIG; | |
1034 | } | |
1035 | } | |
1036 | ||
ce1d5a49 MS |
1037 | req = fuse_get_req(fc); |
1038 | if (IS_ERR(req)) | |
1039 | return PTR_ERR(req); | |
9e6268db MS |
1040 | |
1041 | memset(&inarg, 0, sizeof(inarg)); | |
befc649c | 1042 | iattr_to_fattr(attr, &inarg); |
9e6268db MS |
1043 | req->in.h.opcode = FUSE_SETATTR; |
1044 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1045 | req->in.numargs = 1; |
1046 | req->in.args[0].size = sizeof(inarg); | |
1047 | req->in.args[0].value = &inarg; | |
1048 | req->out.numargs = 1; | |
1049 | req->out.args[0].size = sizeof(outarg); | |
1050 | req->out.args[0].value = &outarg; | |
1051 | request_send(fc, req); | |
1052 | err = req->out.h.error; | |
1053 | fuse_put_request(fc, req); | |
1054 | if (!err) { | |
1055 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
1056 | make_bad_inode(inode); | |
1057 | err = -EIO; | |
1058 | } else { | |
9ffbb916 MS |
1059 | if (is_truncate) |
1060 | fuse_vmtruncate(inode, outarg.attr.size); | |
9e6268db MS |
1061 | fuse_change_attributes(inode, &outarg.attr); |
1062 | fi->i_time = time_to_jiffies(outarg.attr_valid, | |
1063 | outarg.attr_valid_nsec); | |
1064 | } | |
1065 | } else if (err == -EINTR) | |
1066 | fuse_invalidate_attr(inode); | |
1067 | ||
1068 | return err; | |
1069 | } | |
1070 | ||
e5e5558e MS |
1071 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1072 | struct kstat *stat) | |
1073 | { | |
1074 | struct inode *inode = entry->d_inode; | |
1075 | int err = fuse_revalidate(entry); | |
1076 | if (!err) | |
1077 | generic_fillattr(inode, stat); | |
1078 | ||
1079 | return err; | |
1080 | } | |
1081 | ||
92a8780e MS |
1082 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1083 | const void *value, size_t size, int flags) | |
1084 | { | |
1085 | struct inode *inode = entry->d_inode; | |
1086 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1087 | struct fuse_req *req; | |
1088 | struct fuse_setxattr_in inarg; | |
1089 | int err; | |
1090 | ||
92a8780e MS |
1091 | if (fc->no_setxattr) |
1092 | return -EOPNOTSUPP; | |
1093 | ||
ce1d5a49 MS |
1094 | req = fuse_get_req(fc); |
1095 | if (IS_ERR(req)) | |
1096 | return PTR_ERR(req); | |
92a8780e MS |
1097 | |
1098 | memset(&inarg, 0, sizeof(inarg)); | |
1099 | inarg.size = size; | |
1100 | inarg.flags = flags; | |
1101 | req->in.h.opcode = FUSE_SETXATTR; | |
1102 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1103 | req->in.numargs = 3; |
1104 | req->in.args[0].size = sizeof(inarg); | |
1105 | req->in.args[0].value = &inarg; | |
1106 | req->in.args[1].size = strlen(name) + 1; | |
1107 | req->in.args[1].value = name; | |
1108 | req->in.args[2].size = size; | |
1109 | req->in.args[2].value = value; | |
1110 | request_send(fc, req); | |
1111 | err = req->out.h.error; | |
1112 | fuse_put_request(fc, req); | |
1113 | if (err == -ENOSYS) { | |
1114 | fc->no_setxattr = 1; | |
1115 | err = -EOPNOTSUPP; | |
1116 | } | |
1117 | return err; | |
1118 | } | |
1119 | ||
1120 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1121 | void *value, size_t size) | |
1122 | { | |
1123 | struct inode *inode = entry->d_inode; | |
1124 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1125 | struct fuse_req *req; | |
1126 | struct fuse_getxattr_in inarg; | |
1127 | struct fuse_getxattr_out outarg; | |
1128 | ssize_t ret; | |
1129 | ||
1130 | if (fc->no_getxattr) | |
1131 | return -EOPNOTSUPP; | |
1132 | ||
ce1d5a49 MS |
1133 | req = fuse_get_req(fc); |
1134 | if (IS_ERR(req)) | |
1135 | return PTR_ERR(req); | |
92a8780e MS |
1136 | |
1137 | memset(&inarg, 0, sizeof(inarg)); | |
1138 | inarg.size = size; | |
1139 | req->in.h.opcode = FUSE_GETXATTR; | |
1140 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1141 | req->in.numargs = 2; |
1142 | req->in.args[0].size = sizeof(inarg); | |
1143 | req->in.args[0].value = &inarg; | |
1144 | req->in.args[1].size = strlen(name) + 1; | |
1145 | req->in.args[1].value = name; | |
1146 | /* This is really two different operations rolled into one */ | |
1147 | req->out.numargs = 1; | |
1148 | if (size) { | |
1149 | req->out.argvar = 1; | |
1150 | req->out.args[0].size = size; | |
1151 | req->out.args[0].value = value; | |
1152 | } else { | |
1153 | req->out.args[0].size = sizeof(outarg); | |
1154 | req->out.args[0].value = &outarg; | |
1155 | } | |
1156 | request_send(fc, req); | |
1157 | ret = req->out.h.error; | |
1158 | if (!ret) | |
1159 | ret = size ? req->out.args[0].size : outarg.size; | |
1160 | else { | |
1161 | if (ret == -ENOSYS) { | |
1162 | fc->no_getxattr = 1; | |
1163 | ret = -EOPNOTSUPP; | |
1164 | } | |
1165 | } | |
1166 | fuse_put_request(fc, req); | |
1167 | return ret; | |
1168 | } | |
1169 | ||
1170 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1171 | { | |
1172 | struct inode *inode = entry->d_inode; | |
1173 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1174 | struct fuse_req *req; | |
1175 | struct fuse_getxattr_in inarg; | |
1176 | struct fuse_getxattr_out outarg; | |
1177 | ssize_t ret; | |
1178 | ||
1179 | if (fc->no_listxattr) | |
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 | memset(&inarg, 0, sizeof(inarg)); | |
1187 | inarg.size = size; | |
1188 | req->in.h.opcode = FUSE_LISTXATTR; | |
1189 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1190 | req->in.numargs = 1; |
1191 | req->in.args[0].size = sizeof(inarg); | |
1192 | req->in.args[0].value = &inarg; | |
1193 | /* This is really two different operations rolled into one */ | |
1194 | req->out.numargs = 1; | |
1195 | if (size) { | |
1196 | req->out.argvar = 1; | |
1197 | req->out.args[0].size = size; | |
1198 | req->out.args[0].value = list; | |
1199 | } else { | |
1200 | req->out.args[0].size = sizeof(outarg); | |
1201 | req->out.args[0].value = &outarg; | |
1202 | } | |
1203 | request_send(fc, req); | |
1204 | ret = req->out.h.error; | |
1205 | if (!ret) | |
1206 | ret = size ? req->out.args[0].size : outarg.size; | |
1207 | else { | |
1208 | if (ret == -ENOSYS) { | |
1209 | fc->no_listxattr = 1; | |
1210 | ret = -EOPNOTSUPP; | |
1211 | } | |
1212 | } | |
1213 | fuse_put_request(fc, req); | |
1214 | return ret; | |
1215 | } | |
1216 | ||
1217 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1218 | { | |
1219 | struct inode *inode = entry->d_inode; | |
1220 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1221 | struct fuse_req *req; | |
1222 | int err; | |
1223 | ||
1224 | if (fc->no_removexattr) | |
1225 | return -EOPNOTSUPP; | |
1226 | ||
ce1d5a49 MS |
1227 | req = fuse_get_req(fc); |
1228 | if (IS_ERR(req)) | |
1229 | return PTR_ERR(req); | |
92a8780e MS |
1230 | |
1231 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1232 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1233 | req->in.numargs = 1; |
1234 | req->in.args[0].size = strlen(name) + 1; | |
1235 | req->in.args[0].value = name; | |
1236 | request_send(fc, req); | |
1237 | err = req->out.h.error; | |
1238 | fuse_put_request(fc, req); | |
1239 | if (err == -ENOSYS) { | |
1240 | fc->no_removexattr = 1; | |
1241 | err = -EOPNOTSUPP; | |
1242 | } | |
1243 | return err; | |
1244 | } | |
1245 | ||
754661f1 | 1246 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1247 | .lookup = fuse_lookup, |
9e6268db MS |
1248 | .mkdir = fuse_mkdir, |
1249 | .symlink = fuse_symlink, | |
1250 | .unlink = fuse_unlink, | |
1251 | .rmdir = fuse_rmdir, | |
1252 | .rename = fuse_rename, | |
1253 | .link = fuse_link, | |
1254 | .setattr = fuse_setattr, | |
1255 | .create = fuse_create, | |
1256 | .mknod = fuse_mknod, | |
e5e5558e MS |
1257 | .permission = fuse_permission, |
1258 | .getattr = fuse_getattr, | |
92a8780e MS |
1259 | .setxattr = fuse_setxattr, |
1260 | .getxattr = fuse_getxattr, | |
1261 | .listxattr = fuse_listxattr, | |
1262 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1263 | }; |
1264 | ||
4b6f5d20 | 1265 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1266 | .llseek = generic_file_llseek, |
e5e5558e MS |
1267 | .read = generic_read_dir, |
1268 | .readdir = fuse_readdir, | |
1269 | .open = fuse_dir_open, | |
1270 | .release = fuse_dir_release, | |
82547981 | 1271 | .fsync = fuse_dir_fsync, |
e5e5558e MS |
1272 | }; |
1273 | ||
754661f1 | 1274 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1275 | .setattr = fuse_setattr, |
e5e5558e MS |
1276 | .permission = fuse_permission, |
1277 | .getattr = fuse_getattr, | |
92a8780e MS |
1278 | .setxattr = fuse_setxattr, |
1279 | .getxattr = fuse_getxattr, | |
1280 | .listxattr = fuse_listxattr, | |
1281 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1282 | }; |
1283 | ||
754661f1 | 1284 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1285 | .setattr = fuse_setattr, |
e5e5558e MS |
1286 | .follow_link = fuse_follow_link, |
1287 | .put_link = fuse_put_link, | |
1288 | .readlink = generic_readlink, | |
1289 | .getattr = fuse_getattr, | |
92a8780e MS |
1290 | .setxattr = fuse_setxattr, |
1291 | .getxattr = fuse_getxattr, | |
1292 | .listxattr = fuse_listxattr, | |
1293 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1294 | }; |
1295 | ||
1296 | void fuse_init_common(struct inode *inode) | |
1297 | { | |
1298 | inode->i_op = &fuse_common_inode_operations; | |
1299 | } | |
1300 | ||
1301 | void fuse_init_dir(struct inode *inode) | |
1302 | { | |
1303 | inode->i_op = &fuse_dir_inode_operations; | |
1304 | inode->i_fop = &fuse_dir_operations; | |
1305 | } | |
1306 | ||
1307 | void fuse_init_symlink(struct inode *inode) | |
1308 | { | |
1309 | inode->i_op = &fuse_symlink_inode_operations; | |
1310 | } |