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 | */ | |
1fb69e78 MS |
66 | static void fuse_change_entry_timeout(struct dentry *entry, |
67 | struct fuse_entry_out *o) | |
0aa7c699 | 68 | { |
0a0898cf MS |
69 | fuse_dentry_settime(entry, |
70 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
1fb69e78 MS |
71 | } |
72 | ||
73 | static u64 attr_timeout(struct fuse_attr_out *o) | |
74 | { | |
75 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
76 | } | |
77 | ||
78 | static u64 entry_attr_timeout(struct fuse_entry_out *o) | |
79 | { | |
80 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
8cbdf1e6 MS |
81 | } |
82 | ||
6f9f1180 MS |
83 | /* |
84 | * Mark the attributes as stale, so that at the next call to | |
85 | * ->getattr() they will be fetched from userspace | |
86 | */ | |
8cbdf1e6 MS |
87 | void fuse_invalidate_attr(struct inode *inode) |
88 | { | |
0a0898cf | 89 | get_fuse_inode(inode)->i_time = 0; |
8cbdf1e6 MS |
90 | } |
91 | ||
6f9f1180 MS |
92 | /* |
93 | * Just mark the entry as stale, so that a next attempt to look it up | |
94 | * will result in a new lookup call to userspace | |
95 | * | |
96 | * This is called when a dentry is about to become negative and the | |
97 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
98 | * lookup) | |
99 | */ | |
8cbdf1e6 MS |
100 | static void fuse_invalidate_entry_cache(struct dentry *entry) |
101 | { | |
0a0898cf | 102 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
103 | } |
104 | ||
6f9f1180 MS |
105 | /* |
106 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
107 | * dentry from the hash | |
108 | */ | |
8cbdf1e6 MS |
109 | static void fuse_invalidate_entry(struct dentry *entry) |
110 | { | |
111 | d_invalidate(entry); | |
112 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
113 | } |
114 | ||
e5e5558e MS |
115 | static void fuse_lookup_init(struct fuse_req *req, struct inode *dir, |
116 | struct dentry *entry, | |
117 | struct fuse_entry_out *outarg) | |
118 | { | |
119 | req->in.h.opcode = FUSE_LOOKUP; | |
120 | req->in.h.nodeid = get_node_id(dir); | |
e5e5558e MS |
121 | req->in.numargs = 1; |
122 | req->in.args[0].size = entry->d_name.len + 1; | |
123 | req->in.args[0].value = entry->d_name.name; | |
124 | req->out.numargs = 1; | |
125 | req->out.args[0].size = sizeof(struct fuse_entry_out); | |
126 | req->out.args[0].value = outarg; | |
127 | } | |
128 | ||
6f9f1180 MS |
129 | /* |
130 | * Check whether the dentry is still valid | |
131 | * | |
132 | * If the entry validity timeout has expired and the dentry is | |
133 | * positive, try to redo the lookup. If the lookup results in a | |
134 | * different inode, then let the VFS invalidate the dentry and redo | |
135 | * the lookup once more. If the lookup results in the same inode, | |
136 | * then refresh the attributes, timeouts and mark the dentry valid. | |
137 | */ | |
e5e5558e MS |
138 | static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) |
139 | { | |
8cbdf1e6 MS |
140 | struct inode *inode = entry->d_inode; |
141 | ||
142 | if (inode && is_bad_inode(inode)) | |
e5e5558e | 143 | return 0; |
0a0898cf | 144 | else if (fuse_dentry_time(entry) < get_jiffies_64()) { |
e5e5558e | 145 | int err; |
e5e5558e | 146 | struct fuse_entry_out outarg; |
8cbdf1e6 MS |
147 | struct fuse_conn *fc; |
148 | struct fuse_req *req; | |
2d51013e | 149 | struct fuse_req *forget_req; |
e956edd0 | 150 | struct dentry *parent; |
1fb69e78 | 151 | u64 attr_version; |
8cbdf1e6 | 152 | |
50322fe7 | 153 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 MS |
154 | if (!inode) |
155 | return 0; | |
156 | ||
157 | fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
158 | req = fuse_get_req(fc); |
159 | if (IS_ERR(req)) | |
e5e5558e MS |
160 | return 0; |
161 | ||
2d51013e MS |
162 | forget_req = fuse_get_req(fc); |
163 | if (IS_ERR(forget_req)) { | |
164 | fuse_put_request(fc, req); | |
165 | return 0; | |
166 | } | |
167 | ||
1fb69e78 MS |
168 | spin_lock(&fc->lock); |
169 | attr_version = fc->attr_version; | |
170 | spin_unlock(&fc->lock); | |
171 | ||
e956edd0 MS |
172 | parent = dget_parent(entry); |
173 | fuse_lookup_init(req, parent->d_inode, entry, &outarg); | |
7c352bdf | 174 | request_send(fc, req); |
e956edd0 | 175 | dput(parent); |
e5e5558e | 176 | err = req->out.h.error; |
2d51013e | 177 | fuse_put_request(fc, req); |
50322fe7 MS |
178 | /* Zero nodeid is same as -ENOENT */ |
179 | if (!err && !outarg.nodeid) | |
180 | err = -ENOENT; | |
9e6268db | 181 | if (!err) { |
8cbdf1e6 | 182 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 183 | if (outarg.nodeid != get_node_id(inode)) { |
2d51013e MS |
184 | fuse_send_forget(fc, forget_req, |
185 | outarg.nodeid, 1); | |
9e6268db MS |
186 | return 0; |
187 | } | |
8da5ff23 | 188 | spin_lock(&fc->lock); |
9e6268db | 189 | fi->nlookup ++; |
8da5ff23 | 190 | spin_unlock(&fc->lock); |
9e6268db | 191 | } |
2d51013e | 192 | fuse_put_request(fc, forget_req); |
9e6268db | 193 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
194 | return 0; |
195 | ||
1fb69e78 MS |
196 | fuse_change_attributes(inode, &outarg.attr, |
197 | entry_attr_timeout(&outarg), | |
198 | attr_version); | |
199 | fuse_change_entry_timeout(entry, &outarg); | |
e5e5558e MS |
200 | } |
201 | return 1; | |
202 | } | |
203 | ||
8bfc016d | 204 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
205 | { |
206 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
207 | } | |
208 | ||
e5e5558e MS |
209 | static struct dentry_operations fuse_dentry_operations = { |
210 | .d_revalidate = fuse_dentry_revalidate, | |
211 | }; | |
212 | ||
a5bfffac | 213 | int fuse_valid_type(int m) |
39ee059a MS |
214 | { |
215 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
216 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
217 | } | |
218 | ||
d2a85164 MS |
219 | /* |
220 | * Add a directory inode to a dentry, ensuring that no other dentry | |
221 | * refers to this inode. Called with fc->inst_mutex. | |
222 | */ | |
223 | static int fuse_d_add_directory(struct dentry *entry, struct inode *inode) | |
224 | { | |
225 | struct dentry *alias = d_find_alias(inode); | |
226 | if (alias) { | |
227 | /* This tries to shrink the subtree below alias */ | |
228 | fuse_invalidate_entry(alias); | |
229 | dput(alias); | |
230 | if (!list_empty(&inode->i_dentry)) | |
231 | return -EBUSY; | |
232 | } | |
233 | d_add(entry, inode); | |
234 | return 0; | |
235 | } | |
236 | ||
0aa7c699 MS |
237 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
238 | struct nameidata *nd) | |
e5e5558e MS |
239 | { |
240 | int err; | |
e5e5558e MS |
241 | struct fuse_entry_out outarg; |
242 | struct inode *inode = NULL; | |
243 | struct fuse_conn *fc = get_fuse_conn(dir); | |
244 | struct fuse_req *req; | |
2d51013e | 245 | struct fuse_req *forget_req; |
1fb69e78 | 246 | u64 attr_version; |
e5e5558e MS |
247 | |
248 | if (entry->d_name.len > FUSE_NAME_MAX) | |
0aa7c699 | 249 | return ERR_PTR(-ENAMETOOLONG); |
e5e5558e | 250 | |
ce1d5a49 MS |
251 | req = fuse_get_req(fc); |
252 | if (IS_ERR(req)) | |
253 | return ERR_PTR(PTR_ERR(req)); | |
e5e5558e | 254 | |
2d51013e MS |
255 | forget_req = fuse_get_req(fc); |
256 | if (IS_ERR(forget_req)) { | |
257 | fuse_put_request(fc, req); | |
258 | return ERR_PTR(PTR_ERR(forget_req)); | |
259 | } | |
260 | ||
1fb69e78 MS |
261 | spin_lock(&fc->lock); |
262 | attr_version = fc->attr_version; | |
263 | spin_unlock(&fc->lock); | |
264 | ||
e5e5558e MS |
265 | fuse_lookup_init(req, dir, entry, &outarg); |
266 | request_send(fc, req); | |
e5e5558e | 267 | err = req->out.h.error; |
2d51013e | 268 | fuse_put_request(fc, req); |
50322fe7 MS |
269 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
270 | if (!err && outarg.nodeid && | |
a5bfffac TS |
271 | (invalid_nodeid(outarg.nodeid) || |
272 | !fuse_valid_type(outarg.attr.mode))) | |
ee4e5271 | 273 | err = -EIO; |
8cbdf1e6 | 274 | if (!err && outarg.nodeid) { |
e5e5558e | 275 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 MS |
276 | &outarg.attr, entry_attr_timeout(&outarg), |
277 | attr_version); | |
e5e5558e | 278 | if (!inode) { |
2d51013e | 279 | fuse_send_forget(fc, forget_req, outarg.nodeid, 1); |
0aa7c699 | 280 | return ERR_PTR(-ENOMEM); |
e5e5558e MS |
281 | } |
282 | } | |
2d51013e | 283 | fuse_put_request(fc, forget_req); |
e5e5558e | 284 | if (err && err != -ENOENT) |
0aa7c699 | 285 | return ERR_PTR(err); |
e5e5558e | 286 | |
d2a85164 MS |
287 | if (inode && S_ISDIR(inode->i_mode)) { |
288 | mutex_lock(&fc->inst_mutex); | |
289 | err = fuse_d_add_directory(entry, inode); | |
290 | mutex_unlock(&fc->inst_mutex); | |
291 | if (err) { | |
292 | iput(inode); | |
293 | return ERR_PTR(err); | |
294 | } | |
295 | } else | |
296 | d_add(entry, inode); | |
297 | ||
e5e5558e | 298 | entry->d_op = &fuse_dentry_operations; |
8cbdf1e6 | 299 | if (!err) |
1fb69e78 | 300 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
301 | else |
302 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 | 303 | return NULL; |
e5e5558e MS |
304 | } |
305 | ||
51eb01e7 MS |
306 | /* |
307 | * Synchronous release for the case when something goes wrong in CREATE_OPEN | |
308 | */ | |
309 | static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff, | |
310 | u64 nodeid, int flags) | |
311 | { | |
c756e0a4 MS |
312 | fuse_release_fill(ff, nodeid, flags, FUSE_RELEASE); |
313 | ff->reserved_req->force = 1; | |
314 | request_send(fc, ff->reserved_req); | |
315 | fuse_put_request(fc, ff->reserved_req); | |
316 | kfree(ff); | |
51eb01e7 MS |
317 | } |
318 | ||
6f9f1180 MS |
319 | /* |
320 | * Atomic create+open operation | |
321 | * | |
322 | * If the filesystem doesn't support this, then fall back to separate | |
323 | * 'mknod' + 'open' requests. | |
324 | */ | |
fd72faac MS |
325 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, |
326 | struct nameidata *nd) | |
327 | { | |
328 | int err; | |
329 | struct inode *inode; | |
330 | struct fuse_conn *fc = get_fuse_conn(dir); | |
331 | struct fuse_req *req; | |
51eb01e7 | 332 | struct fuse_req *forget_req; |
fd72faac MS |
333 | struct fuse_open_in inarg; |
334 | struct fuse_open_out outopen; | |
335 | struct fuse_entry_out outentry; | |
fd72faac MS |
336 | struct fuse_file *ff; |
337 | struct file *file; | |
338 | int flags = nd->intent.open.flags - 1; | |
339 | ||
fd72faac | 340 | if (fc->no_create) |
ce1d5a49 | 341 | return -ENOSYS; |
fd72faac | 342 | |
51eb01e7 MS |
343 | forget_req = fuse_get_req(fc); |
344 | if (IS_ERR(forget_req)) | |
345 | return PTR_ERR(forget_req); | |
346 | ||
ce1d5a49 | 347 | req = fuse_get_req(fc); |
51eb01e7 | 348 | err = PTR_ERR(req); |
ce1d5a49 | 349 | if (IS_ERR(req)) |
51eb01e7 | 350 | goto out_put_forget_req; |
fd72faac | 351 | |
ce1d5a49 | 352 | err = -ENOMEM; |
fd72faac MS |
353 | ff = fuse_file_alloc(); |
354 | if (!ff) | |
355 | goto out_put_request; | |
356 | ||
357 | flags &= ~O_NOCTTY; | |
358 | memset(&inarg, 0, sizeof(inarg)); | |
359 | inarg.flags = flags; | |
360 | inarg.mode = mode; | |
361 | req->in.h.opcode = FUSE_CREATE; | |
362 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac MS |
363 | req->in.numargs = 2; |
364 | req->in.args[0].size = sizeof(inarg); | |
365 | req->in.args[0].value = &inarg; | |
366 | req->in.args[1].size = entry->d_name.len + 1; | |
367 | req->in.args[1].value = entry->d_name.name; | |
368 | req->out.numargs = 2; | |
369 | req->out.args[0].size = sizeof(outentry); | |
370 | req->out.args[0].value = &outentry; | |
371 | req->out.args[1].size = sizeof(outopen); | |
372 | req->out.args[1].value = &outopen; | |
373 | request_send(fc, req); | |
374 | err = req->out.h.error; | |
375 | if (err) { | |
376 | if (err == -ENOSYS) | |
377 | fc->no_create = 1; | |
378 | goto out_free_ff; | |
379 | } | |
380 | ||
381 | err = -EIO; | |
2827d0b2 | 382 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
383 | goto out_free_ff; |
384 | ||
51eb01e7 | 385 | fuse_put_request(fc, req); |
fd72faac | 386 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 387 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
388 | if (!inode) { |
389 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
390 | ff->fh = outopen.fh; | |
51eb01e7 MS |
391 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
392 | fuse_send_forget(fc, forget_req, outentry.nodeid, 1); | |
393 | return -ENOMEM; | |
fd72faac | 394 | } |
51eb01e7 | 395 | fuse_put_request(fc, forget_req); |
fd72faac | 396 | d_instantiate(entry, inode); |
1fb69e78 | 397 | fuse_change_entry_timeout(entry, &outentry); |
fd72faac MS |
398 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
399 | if (IS_ERR(file)) { | |
400 | ff->fh = outopen.fh; | |
51eb01e7 | 401 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
fd72faac MS |
402 | return PTR_ERR(file); |
403 | } | |
404 | fuse_finish_open(inode, file, ff, &outopen); | |
405 | return 0; | |
406 | ||
407 | out_free_ff: | |
408 | fuse_file_free(ff); | |
409 | out_put_request: | |
410 | fuse_put_request(fc, req); | |
51eb01e7 MS |
411 | out_put_forget_req: |
412 | fuse_put_request(fc, forget_req); | |
fd72faac MS |
413 | return err; |
414 | } | |
415 | ||
6f9f1180 MS |
416 | /* |
417 | * Code shared between mknod, mkdir, symlink and link | |
418 | */ | |
9e6268db MS |
419 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
420 | struct inode *dir, struct dentry *entry, | |
421 | int mode) | |
422 | { | |
423 | struct fuse_entry_out outarg; | |
424 | struct inode *inode; | |
9e6268db | 425 | int err; |
2d51013e MS |
426 | struct fuse_req *forget_req; |
427 | ||
428 | forget_req = fuse_get_req(fc); | |
429 | if (IS_ERR(forget_req)) { | |
430 | fuse_put_request(fc, req); | |
431 | return PTR_ERR(forget_req); | |
432 | } | |
9e6268db MS |
433 | |
434 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
435 | req->out.numargs = 1; |
436 | req->out.args[0].size = sizeof(outarg); | |
437 | req->out.args[0].value = &outarg; | |
438 | request_send(fc, req); | |
439 | err = req->out.h.error; | |
2d51013e MS |
440 | fuse_put_request(fc, req); |
441 | if (err) | |
442 | goto out_put_forget_req; | |
443 | ||
39ee059a MS |
444 | err = -EIO; |
445 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 446 | goto out_put_forget_req; |
39ee059a MS |
447 | |
448 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 449 | goto out_put_forget_req; |
39ee059a | 450 | |
9e6268db | 451 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 452 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 453 | if (!inode) { |
2d51013e | 454 | fuse_send_forget(fc, forget_req, outarg.nodeid, 1); |
9e6268db MS |
455 | return -ENOMEM; |
456 | } | |
2d51013e | 457 | fuse_put_request(fc, forget_req); |
9e6268db | 458 | |
d2a85164 MS |
459 | if (S_ISDIR(inode->i_mode)) { |
460 | struct dentry *alias; | |
461 | mutex_lock(&fc->inst_mutex); | |
462 | alias = d_find_alias(inode); | |
463 | if (alias) { | |
464 | /* New directory must have moved since mkdir */ | |
465 | mutex_unlock(&fc->inst_mutex); | |
466 | dput(alias); | |
467 | iput(inode); | |
468 | return -EBUSY; | |
469 | } | |
470 | d_instantiate(entry, inode); | |
471 | mutex_unlock(&fc->inst_mutex); | |
472 | } else | |
473 | d_instantiate(entry, inode); | |
9e6268db | 474 | |
1fb69e78 | 475 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
476 | fuse_invalidate_attr(dir); |
477 | return 0; | |
39ee059a | 478 | |
2d51013e MS |
479 | out_put_forget_req: |
480 | fuse_put_request(fc, forget_req); | |
39ee059a | 481 | return err; |
9e6268db MS |
482 | } |
483 | ||
484 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
485 | dev_t rdev) | |
486 | { | |
487 | struct fuse_mknod_in inarg; | |
488 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
489 | struct fuse_req *req = fuse_get_req(fc); |
490 | if (IS_ERR(req)) | |
491 | return PTR_ERR(req); | |
9e6268db MS |
492 | |
493 | memset(&inarg, 0, sizeof(inarg)); | |
494 | inarg.mode = mode; | |
495 | inarg.rdev = new_encode_dev(rdev); | |
496 | req->in.h.opcode = FUSE_MKNOD; | |
497 | req->in.numargs = 2; | |
498 | req->in.args[0].size = sizeof(inarg); | |
499 | req->in.args[0].value = &inarg; | |
500 | req->in.args[1].size = entry->d_name.len + 1; | |
501 | req->in.args[1].value = entry->d_name.name; | |
502 | return create_new_entry(fc, req, dir, entry, mode); | |
503 | } | |
504 | ||
505 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
506 | struct nameidata *nd) | |
507 | { | |
b9ba347f | 508 | if (nd && (nd->flags & LOOKUP_OPEN)) { |
fd72faac MS |
509 | int err = fuse_create_open(dir, entry, mode, nd); |
510 | if (err != -ENOSYS) | |
511 | return err; | |
512 | /* Fall back on mknod */ | |
513 | } | |
9e6268db MS |
514 | return fuse_mknod(dir, entry, mode, 0); |
515 | } | |
516 | ||
517 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
518 | { | |
519 | struct fuse_mkdir_in inarg; | |
520 | struct fuse_conn *fc = get_fuse_conn(dir); | |
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 | memset(&inarg, 0, sizeof(inarg)); | |
526 | inarg.mode = mode; | |
527 | req->in.h.opcode = FUSE_MKDIR; | |
528 | req->in.numargs = 2; | |
529 | req->in.args[0].size = sizeof(inarg); | |
530 | req->in.args[0].value = &inarg; | |
531 | req->in.args[1].size = entry->d_name.len + 1; | |
532 | req->in.args[1].value = entry->d_name.name; | |
533 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
534 | } | |
535 | ||
536 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
537 | const char *link) | |
538 | { | |
539 | struct fuse_conn *fc = get_fuse_conn(dir); | |
540 | unsigned len = strlen(link) + 1; | |
ce1d5a49 MS |
541 | struct fuse_req *req = fuse_get_req(fc); |
542 | if (IS_ERR(req)) | |
543 | return PTR_ERR(req); | |
9e6268db MS |
544 | |
545 | req->in.h.opcode = FUSE_SYMLINK; | |
546 | req->in.numargs = 2; | |
547 | req->in.args[0].size = entry->d_name.len + 1; | |
548 | req->in.args[0].value = entry->d_name.name; | |
549 | req->in.args[1].size = len; | |
550 | req->in.args[1].value = link; | |
551 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
552 | } | |
553 | ||
554 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
555 | { | |
556 | int err; | |
557 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
558 | struct fuse_req *req = fuse_get_req(fc); |
559 | if (IS_ERR(req)) | |
560 | return PTR_ERR(req); | |
9e6268db MS |
561 | |
562 | req->in.h.opcode = FUSE_UNLINK; | |
563 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
564 | req->in.numargs = 1; |
565 | req->in.args[0].size = entry->d_name.len + 1; | |
566 | req->in.args[0].value = entry->d_name.name; | |
567 | request_send(fc, req); | |
568 | err = req->out.h.error; | |
569 | fuse_put_request(fc, req); | |
570 | if (!err) { | |
571 | struct inode *inode = entry->d_inode; | |
572 | ||
573 | /* Set nlink to zero so the inode can be cleared, if | |
574 | the inode does have more links this will be | |
575 | discovered at the next lookup/getattr */ | |
ce71ec36 | 576 | clear_nlink(inode); |
9e6268db MS |
577 | fuse_invalidate_attr(inode); |
578 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 579 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
580 | } else if (err == -EINTR) |
581 | fuse_invalidate_entry(entry); | |
582 | return err; | |
583 | } | |
584 | ||
585 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
586 | { | |
587 | int err; | |
588 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
589 | struct fuse_req *req = fuse_get_req(fc); |
590 | if (IS_ERR(req)) | |
591 | return PTR_ERR(req); | |
9e6268db MS |
592 | |
593 | req->in.h.opcode = FUSE_RMDIR; | |
594 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
595 | req->in.numargs = 1; |
596 | req->in.args[0].size = entry->d_name.len + 1; | |
597 | req->in.args[0].value = entry->d_name.name; | |
598 | request_send(fc, req); | |
599 | err = req->out.h.error; | |
600 | fuse_put_request(fc, req); | |
601 | if (!err) { | |
ce71ec36 | 602 | clear_nlink(entry->d_inode); |
9e6268db | 603 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 604 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
605 | } else if (err == -EINTR) |
606 | fuse_invalidate_entry(entry); | |
607 | return err; | |
608 | } | |
609 | ||
610 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
611 | struct inode *newdir, struct dentry *newent) | |
612 | { | |
613 | int err; | |
614 | struct fuse_rename_in inarg; | |
615 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 MS |
616 | struct fuse_req *req = fuse_get_req(fc); |
617 | if (IS_ERR(req)) | |
618 | return PTR_ERR(req); | |
9e6268db MS |
619 | |
620 | memset(&inarg, 0, sizeof(inarg)); | |
621 | inarg.newdir = get_node_id(newdir); | |
622 | req->in.h.opcode = FUSE_RENAME; | |
623 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
624 | req->in.numargs = 3; |
625 | req->in.args[0].size = sizeof(inarg); | |
626 | req->in.args[0].value = &inarg; | |
627 | req->in.args[1].size = oldent->d_name.len + 1; | |
628 | req->in.args[1].value = oldent->d_name.name; | |
629 | req->in.args[2].size = newent->d_name.len + 1; | |
630 | req->in.args[2].value = newent->d_name.name; | |
631 | request_send(fc, req); | |
632 | err = req->out.h.error; | |
633 | fuse_put_request(fc, req); | |
634 | if (!err) { | |
635 | fuse_invalidate_attr(olddir); | |
636 | if (olddir != newdir) | |
637 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
638 | |
639 | /* newent will end up negative */ | |
640 | if (newent->d_inode) | |
641 | fuse_invalidate_entry_cache(newent); | |
9e6268db MS |
642 | } else if (err == -EINTR) { |
643 | /* If request was interrupted, DEITY only knows if the | |
644 | rename actually took place. If the invalidation | |
645 | fails (e.g. some process has CWD under the renamed | |
646 | directory), then there can be inconsistency between | |
647 | the dcache and the real filesystem. Tough luck. */ | |
648 | fuse_invalidate_entry(oldent); | |
649 | if (newent->d_inode) | |
650 | fuse_invalidate_entry(newent); | |
651 | } | |
652 | ||
653 | return err; | |
654 | } | |
655 | ||
656 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
657 | struct dentry *newent) | |
658 | { | |
659 | int err; | |
660 | struct fuse_link_in inarg; | |
661 | struct inode *inode = entry->d_inode; | |
662 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
663 | struct fuse_req *req = fuse_get_req(fc); |
664 | if (IS_ERR(req)) | |
665 | return PTR_ERR(req); | |
9e6268db MS |
666 | |
667 | memset(&inarg, 0, sizeof(inarg)); | |
668 | inarg.oldnodeid = get_node_id(inode); | |
669 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
670 | req->in.numargs = 2; |
671 | req->in.args[0].size = sizeof(inarg); | |
672 | req->in.args[0].value = &inarg; | |
673 | req->in.args[1].size = newent->d_name.len + 1; | |
674 | req->in.args[1].value = newent->d_name.name; | |
675 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
676 | /* Contrary to "normal" filesystems it can happen that link | |
677 | makes two "logical" inodes point to the same "physical" | |
678 | inode. We invalidate the attributes of the old one, so it | |
679 | will reflect changes in the backing inode (link count, | |
680 | etc.) | |
681 | */ | |
682 | if (!err || err == -EINTR) | |
683 | fuse_invalidate_attr(inode); | |
684 | return err; | |
685 | } | |
686 | ||
1fb69e78 MS |
687 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
688 | struct kstat *stat) | |
689 | { | |
690 | stat->dev = inode->i_sb->s_dev; | |
691 | stat->ino = attr->ino; | |
692 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
693 | stat->nlink = attr->nlink; | |
694 | stat->uid = attr->uid; | |
695 | stat->gid = attr->gid; | |
696 | stat->rdev = inode->i_rdev; | |
697 | stat->atime.tv_sec = attr->atime; | |
698 | stat->atime.tv_nsec = attr->atimensec; | |
699 | stat->mtime.tv_sec = attr->mtime; | |
700 | stat->mtime.tv_nsec = attr->mtimensec; | |
701 | stat->ctime.tv_sec = attr->ctime; | |
702 | stat->ctime.tv_nsec = attr->ctimensec; | |
703 | stat->size = attr->size; | |
704 | stat->blocks = attr->blocks; | |
705 | stat->blksize = (1 << inode->i_blkbits); | |
706 | } | |
707 | ||
c79e322f MS |
708 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
709 | struct file *file) | |
e5e5558e MS |
710 | { |
711 | int err; | |
c79e322f MS |
712 | struct fuse_getattr_in inarg; |
713 | struct fuse_attr_out outarg; | |
e5e5558e | 714 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
715 | struct fuse_req *req; |
716 | u64 attr_version; | |
717 | ||
718 | req = fuse_get_req(fc); | |
ce1d5a49 MS |
719 | if (IS_ERR(req)) |
720 | return PTR_ERR(req); | |
e5e5558e | 721 | |
1fb69e78 MS |
722 | spin_lock(&fc->lock); |
723 | attr_version = fc->attr_version; | |
724 | spin_unlock(&fc->lock); | |
725 | ||
c79e322f MS |
726 | memset(&inarg, 0, sizeof(inarg)); |
727 | /* Directories have separate file-handle space */ | |
728 | if (file && S_ISREG(inode->i_mode)) { | |
729 | struct fuse_file *ff = file->private_data; | |
730 | ||
731 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
732 | inarg.fh = ff->fh; | |
733 | } | |
e5e5558e MS |
734 | req->in.h.opcode = FUSE_GETATTR; |
735 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
736 | req->in.numargs = 1; |
737 | req->in.args[0].size = sizeof(inarg); | |
738 | req->in.args[0].value = &inarg; | |
e5e5558e | 739 | req->out.numargs = 1; |
c79e322f MS |
740 | req->out.args[0].size = sizeof(outarg); |
741 | req->out.args[0].value = &outarg; | |
e5e5558e MS |
742 | request_send(fc, req); |
743 | err = req->out.h.error; | |
744 | fuse_put_request(fc, req); | |
745 | if (!err) { | |
c79e322f | 746 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
747 | make_bad_inode(inode); |
748 | err = -EIO; | |
749 | } else { | |
c79e322f MS |
750 | fuse_change_attributes(inode, &outarg.attr, |
751 | attr_timeout(&outarg), | |
1fb69e78 MS |
752 | attr_version); |
753 | if (stat) | |
c79e322f | 754 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
755 | } |
756 | } | |
757 | return err; | |
758 | } | |
759 | ||
87729a55 MS |
760 | /* |
761 | * Calling into a user-controlled filesystem gives the filesystem | |
762 | * daemon ptrace-like capabilities over the requester process. This | |
763 | * means, that the filesystem daemon is able to record the exact | |
764 | * filesystem operations performed, and can also control the behavior | |
765 | * of the requester process in otherwise impossible ways. For example | |
766 | * it can delay the operation for arbitrary length of time allowing | |
767 | * DoS against the requester. | |
768 | * | |
769 | * For this reason only those processes can call into the filesystem, | |
770 | * for which the owner of the mount has ptrace privilege. This | |
771 | * excludes processes started by other users, suid or sgid processes. | |
772 | */ | |
e57ac683 | 773 | int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) |
87729a55 MS |
774 | { |
775 | if (fc->flags & FUSE_ALLOW_OTHER) | |
776 | return 1; | |
777 | ||
778 | if (task->euid == fc->user_id && | |
779 | task->suid == fc->user_id && | |
780 | task->uid == fc->user_id && | |
781 | task->egid == fc->group_id && | |
782 | task->sgid == fc->group_id && | |
783 | task->gid == fc->group_id) | |
784 | return 1; | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
31d40d74 MS |
789 | static int fuse_access(struct inode *inode, int mask) |
790 | { | |
791 | struct fuse_conn *fc = get_fuse_conn(inode); | |
792 | struct fuse_req *req; | |
793 | struct fuse_access_in inarg; | |
794 | int err; | |
795 | ||
796 | if (fc->no_access) | |
797 | return 0; | |
798 | ||
ce1d5a49 MS |
799 | req = fuse_get_req(fc); |
800 | if (IS_ERR(req)) | |
801 | return PTR_ERR(req); | |
31d40d74 MS |
802 | |
803 | memset(&inarg, 0, sizeof(inarg)); | |
804 | inarg.mask = mask; | |
805 | req->in.h.opcode = FUSE_ACCESS; | |
806 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
807 | req->in.numargs = 1; |
808 | req->in.args[0].size = sizeof(inarg); | |
809 | req->in.args[0].value = &inarg; | |
810 | request_send(fc, req); | |
811 | err = req->out.h.error; | |
812 | fuse_put_request(fc, req); | |
813 | if (err == -ENOSYS) { | |
814 | fc->no_access = 1; | |
815 | err = 0; | |
816 | } | |
817 | return err; | |
818 | } | |
819 | ||
6f9f1180 MS |
820 | /* |
821 | * Check permission. The two basic access models of FUSE are: | |
822 | * | |
823 | * 1) Local access checking ('default_permissions' mount option) based | |
824 | * on file mode. This is the plain old disk filesystem permission | |
825 | * modell. | |
826 | * | |
827 | * 2) "Remote" access checking, where server is responsible for | |
828 | * checking permission in each inode operation. An exception to this | |
829 | * is if ->permission() was invoked from sys_access() in which case an | |
830 | * access request is sent. Execute permission is still checked | |
831 | * locally based on file mode. | |
832 | */ | |
e5e5558e MS |
833 | static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) |
834 | { | |
835 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
836 | bool refreshed = false; |
837 | int err = 0; | |
e5e5558e | 838 | |
87729a55 | 839 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 840 | return -EACCES; |
244f6385 MS |
841 | |
842 | /* | |
e8e96157 | 843 | * If attributes are needed, refresh them before proceeding |
244f6385 | 844 | */ |
e8e96157 MS |
845 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
846 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
1fb69e78 MS |
847 | struct fuse_inode *fi = get_fuse_inode(inode); |
848 | if (fi->i_time < get_jiffies_64()) { | |
c79e322f | 849 | err = fuse_do_getattr(inode, NULL, NULL); |
1fb69e78 MS |
850 | if (err) |
851 | return err; | |
244f6385 | 852 | |
1fb69e78 MS |
853 | refreshed = true; |
854 | } | |
244f6385 MS |
855 | } |
856 | ||
857 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
1e9a4ed9 MS |
858 | int err = generic_permission(inode, mask, NULL); |
859 | ||
860 | /* If permission is denied, try to refresh file | |
861 | attributes. This is also needed, because the root | |
862 | node will at first have no permissions */ | |
244f6385 | 863 | if (err == -EACCES && !refreshed) { |
c79e322f | 864 | err = fuse_do_getattr(inode, NULL, NULL); |
1e9a4ed9 MS |
865 | if (!err) |
866 | err = generic_permission(inode, mask, NULL); | |
867 | } | |
868 | ||
6f9f1180 MS |
869 | /* Note: the opposite of the above test does not |
870 | exist. So if permissions are revoked this won't be | |
871 | noticed immediately, only after the attribute | |
872 | timeout has expired */ | |
e8e96157 MS |
873 | } else if (nd && (nd->flags & (LOOKUP_ACCESS | LOOKUP_CHDIR))) { |
874 | err = fuse_access(inode, mask); | |
875 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
876 | if (!(inode->i_mode & S_IXUGO)) { | |
877 | if (refreshed) | |
878 | return -EACCES; | |
879 | ||
c79e322f | 880 | err = fuse_do_getattr(inode, NULL, NULL); |
e8e96157 MS |
881 | if (!err && !(inode->i_mode & S_IXUGO)) |
882 | return -EACCES; | |
883 | } | |
e5e5558e | 884 | } |
244f6385 | 885 | return err; |
e5e5558e MS |
886 | } |
887 | ||
888 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
889 | void *dstbuf, filldir_t filldir) | |
890 | { | |
891 | while (nbytes >= FUSE_NAME_OFFSET) { | |
892 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
893 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
894 | int over; | |
895 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
896 | return -EIO; | |
897 | if (reclen > nbytes) | |
898 | break; | |
899 | ||
900 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
901 | file->f_pos, dirent->ino, dirent->type); | |
902 | if (over) | |
903 | break; | |
904 | ||
905 | buf += reclen; | |
906 | nbytes -= reclen; | |
907 | file->f_pos = dirent->off; | |
908 | } | |
909 | ||
910 | return 0; | |
911 | } | |
912 | ||
04730fef | 913 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 914 | { |
04730fef MS |
915 | int err; |
916 | size_t nbytes; | |
917 | struct page *page; | |
7706a9d6 | 918 | struct inode *inode = file->f_path.dentry->d_inode; |
e5e5558e | 919 | struct fuse_conn *fc = get_fuse_conn(inode); |
c756e0a4 | 920 | struct fuse_file *ff = file->private_data; |
248d86e8 MS |
921 | struct fuse_req *req; |
922 | ||
923 | if (is_bad_inode(inode)) | |
924 | return -EIO; | |
925 | ||
ce1d5a49 MS |
926 | req = fuse_get_req(fc); |
927 | if (IS_ERR(req)) | |
928 | return PTR_ERR(req); | |
e5e5558e | 929 | |
04730fef MS |
930 | page = alloc_page(GFP_KERNEL); |
931 | if (!page) { | |
932 | fuse_put_request(fc, req); | |
933 | return -ENOMEM; | |
934 | } | |
935 | req->num_pages = 1; | |
936 | req->pages[0] = page; | |
c756e0a4 | 937 | fuse_read_fill(req, ff, inode, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
361b1eb5 MS |
938 | request_send(fc, req); |
939 | nbytes = req->out.args[0].size; | |
e5e5558e MS |
940 | err = req->out.h.error; |
941 | fuse_put_request(fc, req); | |
942 | if (!err) | |
04730fef MS |
943 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
944 | filldir); | |
e5e5558e | 945 | |
04730fef | 946 | __free_page(page); |
b36c31ba | 947 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 948 | return err; |
e5e5558e MS |
949 | } |
950 | ||
951 | static char *read_link(struct dentry *dentry) | |
952 | { | |
953 | struct inode *inode = dentry->d_inode; | |
954 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 955 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
956 | char *link; |
957 | ||
ce1d5a49 MS |
958 | if (IS_ERR(req)) |
959 | return ERR_PTR(PTR_ERR(req)); | |
e5e5558e MS |
960 | |
961 | link = (char *) __get_free_page(GFP_KERNEL); | |
962 | if (!link) { | |
963 | link = ERR_PTR(-ENOMEM); | |
964 | goto out; | |
965 | } | |
966 | req->in.h.opcode = FUSE_READLINK; | |
967 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
968 | req->out.argvar = 1; |
969 | req->out.numargs = 1; | |
970 | req->out.args[0].size = PAGE_SIZE - 1; | |
971 | req->out.args[0].value = link; | |
972 | request_send(fc, req); | |
973 | if (req->out.h.error) { | |
974 | free_page((unsigned long) link); | |
975 | link = ERR_PTR(req->out.h.error); | |
976 | } else | |
977 | link[req->out.args[0].size] = '\0'; | |
978 | out: | |
979 | fuse_put_request(fc, req); | |
b36c31ba | 980 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
981 | return link; |
982 | } | |
983 | ||
984 | static void free_link(char *link) | |
985 | { | |
986 | if (!IS_ERR(link)) | |
987 | free_page((unsigned long) link); | |
988 | } | |
989 | ||
990 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
991 | { | |
992 | nd_set_link(nd, read_link(dentry)); | |
993 | return NULL; | |
994 | } | |
995 | ||
996 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
997 | { | |
998 | free_link(nd_get_link(nd)); | |
999 | } | |
1000 | ||
1001 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1002 | { | |
04730fef | 1003 | return fuse_open_common(inode, file, 1); |
e5e5558e MS |
1004 | } |
1005 | ||
1006 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1007 | { | |
04730fef | 1008 | return fuse_release_common(inode, file, 1); |
e5e5558e MS |
1009 | } |
1010 | ||
82547981 MS |
1011 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) |
1012 | { | |
1013 | /* nfsd can call this with no file */ | |
1014 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; | |
1015 | } | |
1016 | ||
befc649c | 1017 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
1018 | { |
1019 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1020 | |
1021 | if (ivalid & ATTR_MODE) | |
befc649c | 1022 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1023 | if (ivalid & ATTR_UID) |
befc649c | 1024 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 1025 | if (ivalid & ATTR_GID) |
befc649c | 1026 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 1027 | if (ivalid & ATTR_SIZE) |
befc649c | 1028 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
9e6268db MS |
1029 | /* You can only _set_ these together (they may change by themselves) */ |
1030 | if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { | |
befc649c MS |
1031 | arg->valid |= FATTR_ATIME | FATTR_MTIME; |
1032 | arg->atime = iattr->ia_atime.tv_sec; | |
1033 | arg->mtime = iattr->ia_mtime.tv_sec; | |
1034 | } | |
1035 | if (ivalid & ATTR_FILE) { | |
1036 | struct fuse_file *ff = iattr->ia_file->private_data; | |
1037 | arg->valid |= FATTR_FH; | |
1038 | arg->fh = ff->fh; | |
9e6268db | 1039 | } |
9e6268db MS |
1040 | } |
1041 | ||
6f9f1180 MS |
1042 | /* |
1043 | * Set attributes, and at the same time refresh them. | |
1044 | * | |
1045 | * Truncation is slightly complicated, because the 'truncate' request | |
1046 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1047 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1048 | * and the actual truncation by hand. | |
6f9f1180 | 1049 | */ |
9e6268db MS |
1050 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1051 | { | |
1052 | struct inode *inode = entry->d_inode; | |
1053 | struct fuse_conn *fc = get_fuse_conn(inode); | |
9e6268db MS |
1054 | struct fuse_req *req; |
1055 | struct fuse_setattr_in inarg; | |
1056 | struct fuse_attr_out outarg; | |
1057 | int err; | |
9e6268db | 1058 | |
e57ac683 MS |
1059 | if (!fuse_allow_task(fc, current)) |
1060 | return -EACCES; | |
1061 | ||
1e9a4ed9 MS |
1062 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
1063 | err = inode_change_ok(inode, attr); | |
1064 | if (err) | |
1065 | return err; | |
1066 | } | |
1067 | ||
9e6268db MS |
1068 | if (attr->ia_valid & ATTR_SIZE) { |
1069 | unsigned long limit; | |
b2d2272f MS |
1070 | if (IS_SWAPFILE(inode)) |
1071 | return -ETXTBSY; | |
9e6268db MS |
1072 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
1073 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { | |
1074 | send_sig(SIGXFSZ, current, 0); | |
1075 | return -EFBIG; | |
1076 | } | |
1077 | } | |
1078 | ||
ce1d5a49 MS |
1079 | req = fuse_get_req(fc); |
1080 | if (IS_ERR(req)) | |
1081 | return PTR_ERR(req); | |
9e6268db MS |
1082 | |
1083 | memset(&inarg, 0, sizeof(inarg)); | |
befc649c | 1084 | iattr_to_fattr(attr, &inarg); |
9e6268db MS |
1085 | req->in.h.opcode = FUSE_SETATTR; |
1086 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1087 | req->in.numargs = 1; |
1088 | req->in.args[0].size = sizeof(inarg); | |
1089 | req->in.args[0].value = &inarg; | |
1090 | req->out.numargs = 1; | |
1091 | req->out.args[0].size = sizeof(outarg); | |
1092 | req->out.args[0].value = &outarg; | |
1093 | request_send(fc, req); | |
1094 | err = req->out.h.error; | |
1095 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1096 | if (err) { |
1097 | if (err == -EINTR) | |
1098 | fuse_invalidate_attr(inode); | |
1099 | return err; | |
1100 | } | |
9e6268db | 1101 | |
e00d2c2d MS |
1102 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1103 | make_bad_inode(inode); | |
1104 | return -EIO; | |
1105 | } | |
1106 | ||
1fb69e78 | 1107 | fuse_change_attributes(inode, &outarg.attr, attr_timeout(&outarg), 0); |
e00d2c2d | 1108 | return 0; |
9e6268db MS |
1109 | } |
1110 | ||
e5e5558e MS |
1111 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1112 | struct kstat *stat) | |
1113 | { | |
1114 | struct inode *inode = entry->d_inode; | |
244f6385 MS |
1115 | struct fuse_inode *fi = get_fuse_inode(inode); |
1116 | struct fuse_conn *fc = get_fuse_conn(inode); | |
e8e96157 | 1117 | int err; |
244f6385 MS |
1118 | |
1119 | if (!fuse_allow_task(fc, current)) | |
1120 | return -EACCES; | |
1121 | ||
1fb69e78 | 1122 | if (fi->i_time < get_jiffies_64()) |
c79e322f | 1123 | err = fuse_do_getattr(inode, stat, NULL); |
1fb69e78 MS |
1124 | else { |
1125 | err = 0; | |
e5e5558e | 1126 | generic_fillattr(inode, stat); |
ebc14c4d MS |
1127 | stat->mode = fi->orig_i_mode; |
1128 | } | |
e5e5558e MS |
1129 | |
1130 | return err; | |
1131 | } | |
1132 | ||
92a8780e MS |
1133 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1134 | const void *value, size_t size, int flags) | |
1135 | { | |
1136 | struct inode *inode = entry->d_inode; | |
1137 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1138 | struct fuse_req *req; | |
1139 | struct fuse_setxattr_in inarg; | |
1140 | int err; | |
1141 | ||
92a8780e MS |
1142 | if (fc->no_setxattr) |
1143 | return -EOPNOTSUPP; | |
1144 | ||
ce1d5a49 MS |
1145 | req = fuse_get_req(fc); |
1146 | if (IS_ERR(req)) | |
1147 | return PTR_ERR(req); | |
92a8780e MS |
1148 | |
1149 | memset(&inarg, 0, sizeof(inarg)); | |
1150 | inarg.size = size; | |
1151 | inarg.flags = flags; | |
1152 | req->in.h.opcode = FUSE_SETXATTR; | |
1153 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1154 | req->in.numargs = 3; |
1155 | req->in.args[0].size = sizeof(inarg); | |
1156 | req->in.args[0].value = &inarg; | |
1157 | req->in.args[1].size = strlen(name) + 1; | |
1158 | req->in.args[1].value = name; | |
1159 | req->in.args[2].size = size; | |
1160 | req->in.args[2].value = value; | |
1161 | request_send(fc, req); | |
1162 | err = req->out.h.error; | |
1163 | fuse_put_request(fc, req); | |
1164 | if (err == -ENOSYS) { | |
1165 | fc->no_setxattr = 1; | |
1166 | err = -EOPNOTSUPP; | |
1167 | } | |
1168 | return err; | |
1169 | } | |
1170 | ||
1171 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1172 | void *value, size_t size) | |
1173 | { | |
1174 | struct inode *inode = entry->d_inode; | |
1175 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1176 | struct fuse_req *req; | |
1177 | struct fuse_getxattr_in inarg; | |
1178 | struct fuse_getxattr_out outarg; | |
1179 | ssize_t ret; | |
1180 | ||
1181 | if (fc->no_getxattr) | |
1182 | return -EOPNOTSUPP; | |
1183 | ||
ce1d5a49 MS |
1184 | req = fuse_get_req(fc); |
1185 | if (IS_ERR(req)) | |
1186 | return PTR_ERR(req); | |
92a8780e MS |
1187 | |
1188 | memset(&inarg, 0, sizeof(inarg)); | |
1189 | inarg.size = size; | |
1190 | req->in.h.opcode = FUSE_GETXATTR; | |
1191 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1192 | req->in.numargs = 2; |
1193 | req->in.args[0].size = sizeof(inarg); | |
1194 | req->in.args[0].value = &inarg; | |
1195 | req->in.args[1].size = strlen(name) + 1; | |
1196 | req->in.args[1].value = name; | |
1197 | /* This is really two different operations rolled into one */ | |
1198 | req->out.numargs = 1; | |
1199 | if (size) { | |
1200 | req->out.argvar = 1; | |
1201 | req->out.args[0].size = size; | |
1202 | req->out.args[0].value = value; | |
1203 | } else { | |
1204 | req->out.args[0].size = sizeof(outarg); | |
1205 | req->out.args[0].value = &outarg; | |
1206 | } | |
1207 | request_send(fc, req); | |
1208 | ret = req->out.h.error; | |
1209 | if (!ret) | |
1210 | ret = size ? req->out.args[0].size : outarg.size; | |
1211 | else { | |
1212 | if (ret == -ENOSYS) { | |
1213 | fc->no_getxattr = 1; | |
1214 | ret = -EOPNOTSUPP; | |
1215 | } | |
1216 | } | |
1217 | fuse_put_request(fc, req); | |
1218 | return ret; | |
1219 | } | |
1220 | ||
1221 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1222 | { | |
1223 | struct inode *inode = entry->d_inode; | |
1224 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1225 | struct fuse_req *req; | |
1226 | struct fuse_getxattr_in inarg; | |
1227 | struct fuse_getxattr_out outarg; | |
1228 | ssize_t ret; | |
1229 | ||
e57ac683 MS |
1230 | if (!fuse_allow_task(fc, current)) |
1231 | return -EACCES; | |
1232 | ||
92a8780e MS |
1233 | if (fc->no_listxattr) |
1234 | return -EOPNOTSUPP; | |
1235 | ||
ce1d5a49 MS |
1236 | req = fuse_get_req(fc); |
1237 | if (IS_ERR(req)) | |
1238 | return PTR_ERR(req); | |
92a8780e MS |
1239 | |
1240 | memset(&inarg, 0, sizeof(inarg)); | |
1241 | inarg.size = size; | |
1242 | req->in.h.opcode = FUSE_LISTXATTR; | |
1243 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1244 | req->in.numargs = 1; |
1245 | req->in.args[0].size = sizeof(inarg); | |
1246 | req->in.args[0].value = &inarg; | |
1247 | /* This is really two different operations rolled into one */ | |
1248 | req->out.numargs = 1; | |
1249 | if (size) { | |
1250 | req->out.argvar = 1; | |
1251 | req->out.args[0].size = size; | |
1252 | req->out.args[0].value = list; | |
1253 | } else { | |
1254 | req->out.args[0].size = sizeof(outarg); | |
1255 | req->out.args[0].value = &outarg; | |
1256 | } | |
1257 | request_send(fc, req); | |
1258 | ret = req->out.h.error; | |
1259 | if (!ret) | |
1260 | ret = size ? req->out.args[0].size : outarg.size; | |
1261 | else { | |
1262 | if (ret == -ENOSYS) { | |
1263 | fc->no_listxattr = 1; | |
1264 | ret = -EOPNOTSUPP; | |
1265 | } | |
1266 | } | |
1267 | fuse_put_request(fc, req); | |
1268 | return ret; | |
1269 | } | |
1270 | ||
1271 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1272 | { | |
1273 | struct inode *inode = entry->d_inode; | |
1274 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1275 | struct fuse_req *req; | |
1276 | int err; | |
1277 | ||
1278 | if (fc->no_removexattr) | |
1279 | return -EOPNOTSUPP; | |
1280 | ||
ce1d5a49 MS |
1281 | req = fuse_get_req(fc); |
1282 | if (IS_ERR(req)) | |
1283 | return PTR_ERR(req); | |
92a8780e MS |
1284 | |
1285 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1286 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1287 | req->in.numargs = 1; |
1288 | req->in.args[0].size = strlen(name) + 1; | |
1289 | req->in.args[0].value = name; | |
1290 | request_send(fc, req); | |
1291 | err = req->out.h.error; | |
1292 | fuse_put_request(fc, req); | |
1293 | if (err == -ENOSYS) { | |
1294 | fc->no_removexattr = 1; | |
1295 | err = -EOPNOTSUPP; | |
1296 | } | |
1297 | return err; | |
1298 | } | |
1299 | ||
754661f1 | 1300 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1301 | .lookup = fuse_lookup, |
9e6268db MS |
1302 | .mkdir = fuse_mkdir, |
1303 | .symlink = fuse_symlink, | |
1304 | .unlink = fuse_unlink, | |
1305 | .rmdir = fuse_rmdir, | |
1306 | .rename = fuse_rename, | |
1307 | .link = fuse_link, | |
1308 | .setattr = fuse_setattr, | |
1309 | .create = fuse_create, | |
1310 | .mknod = fuse_mknod, | |
e5e5558e MS |
1311 | .permission = fuse_permission, |
1312 | .getattr = fuse_getattr, | |
92a8780e MS |
1313 | .setxattr = fuse_setxattr, |
1314 | .getxattr = fuse_getxattr, | |
1315 | .listxattr = fuse_listxattr, | |
1316 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1317 | }; |
1318 | ||
4b6f5d20 | 1319 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1320 | .llseek = generic_file_llseek, |
e5e5558e MS |
1321 | .read = generic_read_dir, |
1322 | .readdir = fuse_readdir, | |
1323 | .open = fuse_dir_open, | |
1324 | .release = fuse_dir_release, | |
82547981 | 1325 | .fsync = fuse_dir_fsync, |
e5e5558e MS |
1326 | }; |
1327 | ||
754661f1 | 1328 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1329 | .setattr = fuse_setattr, |
e5e5558e MS |
1330 | .permission = fuse_permission, |
1331 | .getattr = fuse_getattr, | |
92a8780e MS |
1332 | .setxattr = fuse_setxattr, |
1333 | .getxattr = fuse_getxattr, | |
1334 | .listxattr = fuse_listxattr, | |
1335 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1336 | }; |
1337 | ||
754661f1 | 1338 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1339 | .setattr = fuse_setattr, |
e5e5558e MS |
1340 | .follow_link = fuse_follow_link, |
1341 | .put_link = fuse_put_link, | |
1342 | .readlink = generic_readlink, | |
1343 | .getattr = fuse_getattr, | |
92a8780e MS |
1344 | .setxattr = fuse_setxattr, |
1345 | .getxattr = fuse_getxattr, | |
1346 | .listxattr = fuse_listxattr, | |
1347 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1348 | }; |
1349 | ||
1350 | void fuse_init_common(struct inode *inode) | |
1351 | { | |
1352 | inode->i_op = &fuse_common_inode_operations; | |
1353 | } | |
1354 | ||
1355 | void fuse_init_dir(struct inode *inode) | |
1356 | { | |
1357 | inode->i_op = &fuse_dir_inode_operations; | |
1358 | inode->i_fop = &fuse_dir_operations; | |
1359 | } | |
1360 | ||
1361 | void fuse_init_symlink(struct inode *inode) | |
1362 | { | |
1363 | inode->i_op = &fuse_symlink_inode_operations; | |
1364 | } |