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Commit | Line | Data |
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e5e5558e MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
51eb01e7 | 3 | Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> |
e5e5558e MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/file.h> | |
13 | #include <linux/gfp.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/namei.h> | |
16 | ||
6f9f1180 MS |
17 | /* |
18 | * FUSE caches dentries and attributes with separate timeout. The | |
19 | * time in jiffies until the dentry/attributes are valid is stored in | |
20 | * dentry->d_time and fuse_inode->i_time respectively. | |
21 | */ | |
22 | ||
23 | /* | |
24 | * Calculate the time in jiffies until a dentry/attributes are valid | |
25 | */ | |
8bfc016d | 26 | static unsigned long time_to_jiffies(unsigned long sec, unsigned long nsec) |
e5e5558e MS |
27 | { |
28 | struct timespec ts = {sec, nsec}; | |
29 | return jiffies + timespec_to_jiffies(&ts); | |
30 | } | |
31 | ||
6f9f1180 MS |
32 | /* |
33 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
34 | * replies | |
35 | */ | |
0aa7c699 MS |
36 | static void fuse_change_timeout(struct dentry *entry, struct fuse_entry_out *o) |
37 | { | |
0aa7c699 | 38 | entry->d_time = time_to_jiffies(o->entry_valid, o->entry_valid_nsec); |
8cbdf1e6 MS |
39 | if (entry->d_inode) |
40 | get_fuse_inode(entry->d_inode)->i_time = | |
41 | time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
42 | } | |
43 | ||
6f9f1180 MS |
44 | /* |
45 | * Mark the attributes as stale, so that at the next call to | |
46 | * ->getattr() they will be fetched from userspace | |
47 | */ | |
8cbdf1e6 MS |
48 | void fuse_invalidate_attr(struct inode *inode) |
49 | { | |
50 | get_fuse_inode(inode)->i_time = jiffies - 1; | |
51 | } | |
52 | ||
6f9f1180 MS |
53 | /* |
54 | * Just mark the entry as stale, so that a next attempt to look it up | |
55 | * will result in a new lookup call to userspace | |
56 | * | |
57 | * This is called when a dentry is about to become negative and the | |
58 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
59 | * lookup) | |
60 | */ | |
8cbdf1e6 MS |
61 | static void fuse_invalidate_entry_cache(struct dentry *entry) |
62 | { | |
63 | entry->d_time = jiffies - 1; | |
64 | } | |
65 | ||
6f9f1180 MS |
66 | /* |
67 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
68 | * dentry from the hash | |
69 | */ | |
8cbdf1e6 MS |
70 | static void fuse_invalidate_entry(struct dentry *entry) |
71 | { | |
72 | d_invalidate(entry); | |
73 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
74 | } |
75 | ||
e5e5558e MS |
76 | static void fuse_lookup_init(struct fuse_req *req, struct inode *dir, |
77 | struct dentry *entry, | |
78 | struct fuse_entry_out *outarg) | |
79 | { | |
80 | req->in.h.opcode = FUSE_LOOKUP; | |
81 | req->in.h.nodeid = get_node_id(dir); | |
e5e5558e MS |
82 | req->in.numargs = 1; |
83 | req->in.args[0].size = entry->d_name.len + 1; | |
84 | req->in.args[0].value = entry->d_name.name; | |
85 | req->out.numargs = 1; | |
86 | req->out.args[0].size = sizeof(struct fuse_entry_out); | |
87 | req->out.args[0].value = outarg; | |
88 | } | |
89 | ||
6f9f1180 MS |
90 | /* |
91 | * Check whether the dentry is still valid | |
92 | * | |
93 | * If the entry validity timeout has expired and the dentry is | |
94 | * positive, try to redo the lookup. If the lookup results in a | |
95 | * different inode, then let the VFS invalidate the dentry and redo | |
96 | * the lookup once more. If the lookup results in the same inode, | |
97 | * then refresh the attributes, timeouts and mark the dentry valid. | |
98 | */ | |
e5e5558e MS |
99 | static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) |
100 | { | |
8cbdf1e6 MS |
101 | struct inode *inode = entry->d_inode; |
102 | ||
103 | if (inode && is_bad_inode(inode)) | |
e5e5558e MS |
104 | return 0; |
105 | else if (time_after(jiffies, entry->d_time)) { | |
106 | int err; | |
e5e5558e | 107 | struct fuse_entry_out outarg; |
8cbdf1e6 MS |
108 | struct fuse_conn *fc; |
109 | struct fuse_req *req; | |
110 | ||
6f9f1180 | 111 | /* Doesn't hurt to "reset" the validity timeout */ |
8cbdf1e6 | 112 | fuse_invalidate_entry_cache(entry); |
50322fe7 MS |
113 | |
114 | /* For negative dentries, always do a fresh lookup */ | |
8cbdf1e6 MS |
115 | if (!inode) |
116 | return 0; | |
117 | ||
118 | fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
119 | req = fuse_get_req(fc); |
120 | if (IS_ERR(req)) | |
e5e5558e MS |
121 | return 0; |
122 | ||
123 | fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg); | |
7c352bdf | 124 | request_send(fc, req); |
e5e5558e | 125 | err = req->out.h.error; |
50322fe7 MS |
126 | /* Zero nodeid is same as -ENOENT */ |
127 | if (!err && !outarg.nodeid) | |
128 | err = -ENOENT; | |
9e6268db | 129 | if (!err) { |
8cbdf1e6 | 130 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db MS |
131 | if (outarg.nodeid != get_node_id(inode)) { |
132 | fuse_send_forget(fc, req, outarg.nodeid, 1); | |
133 | return 0; | |
134 | } | |
135 | fi->nlookup ++; | |
136 | } | |
e5e5558e | 137 | fuse_put_request(fc, req); |
9e6268db | 138 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
139 | return 0; |
140 | ||
141 | fuse_change_attributes(inode, &outarg.attr); | |
0aa7c699 | 142 | fuse_change_timeout(entry, &outarg); |
e5e5558e MS |
143 | } |
144 | return 1; | |
145 | } | |
146 | ||
6f9f1180 MS |
147 | /* |
148 | * Check if there's already a hashed alias of this directory inode. | |
149 | * If yes, then lookup and mkdir must not create a new alias. | |
150 | */ | |
f007d5c9 MS |
151 | static int dir_alias(struct inode *inode) |
152 | { | |
153 | if (S_ISDIR(inode->i_mode)) { | |
f007d5c9 MS |
154 | struct dentry *alias = d_find_alias(inode); |
155 | if (alias) { | |
156 | dput(alias); | |
157 | return 1; | |
158 | } | |
159 | } | |
160 | return 0; | |
161 | } | |
162 | ||
8bfc016d | 163 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
164 | { |
165 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
166 | } | |
167 | ||
e5e5558e MS |
168 | static struct dentry_operations fuse_dentry_operations = { |
169 | .d_revalidate = fuse_dentry_revalidate, | |
170 | }; | |
171 | ||
8bfc016d | 172 | static int valid_mode(int m) |
39ee059a MS |
173 | { |
174 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
175 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
176 | } | |
177 | ||
0aa7c699 MS |
178 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
179 | struct nameidata *nd) | |
e5e5558e MS |
180 | { |
181 | int err; | |
e5e5558e MS |
182 | struct fuse_entry_out outarg; |
183 | struct inode *inode = NULL; | |
184 | struct fuse_conn *fc = get_fuse_conn(dir); | |
185 | struct fuse_req *req; | |
186 | ||
187 | if (entry->d_name.len > FUSE_NAME_MAX) | |
0aa7c699 | 188 | return ERR_PTR(-ENAMETOOLONG); |
e5e5558e | 189 | |
ce1d5a49 MS |
190 | req = fuse_get_req(fc); |
191 | if (IS_ERR(req)) | |
192 | return ERR_PTR(PTR_ERR(req)); | |
e5e5558e MS |
193 | |
194 | fuse_lookup_init(req, dir, entry, &outarg); | |
195 | request_send(fc, req); | |
e5e5558e | 196 | err = req->out.h.error; |
50322fe7 MS |
197 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
198 | if (!err && outarg.nodeid && | |
199 | (invalid_nodeid(outarg.nodeid) || !valid_mode(outarg.attr.mode))) | |
ee4e5271 | 200 | err = -EIO; |
8cbdf1e6 | 201 | if (!err && outarg.nodeid) { |
e5e5558e | 202 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
9e6268db | 203 | &outarg.attr); |
e5e5558e | 204 | if (!inode) { |
9e6268db | 205 | fuse_send_forget(fc, req, outarg.nodeid, 1); |
0aa7c699 | 206 | return ERR_PTR(-ENOMEM); |
e5e5558e MS |
207 | } |
208 | } | |
209 | fuse_put_request(fc, req); | |
210 | if (err && err != -ENOENT) | |
0aa7c699 | 211 | return ERR_PTR(err); |
e5e5558e | 212 | |
0aa7c699 MS |
213 | if (inode && dir_alias(inode)) { |
214 | iput(inode); | |
215 | return ERR_PTR(-EIO); | |
e5e5558e | 216 | } |
0aa7c699 | 217 | d_add(entry, inode); |
e5e5558e | 218 | entry->d_op = &fuse_dentry_operations; |
8cbdf1e6 | 219 | if (!err) |
0aa7c699 | 220 | fuse_change_timeout(entry, &outarg); |
8cbdf1e6 MS |
221 | else |
222 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 | 223 | return NULL; |
e5e5558e MS |
224 | } |
225 | ||
51eb01e7 MS |
226 | /* |
227 | * Synchronous release for the case when something goes wrong in CREATE_OPEN | |
228 | */ | |
229 | static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff, | |
230 | u64 nodeid, int flags) | |
231 | { | |
232 | struct fuse_req *req; | |
233 | ||
234 | req = fuse_release_fill(ff, nodeid, flags, FUSE_RELEASE); | |
235 | req->force = 1; | |
236 | request_send(fc, req); | |
237 | fuse_put_request(fc, req); | |
238 | } | |
239 | ||
6f9f1180 MS |
240 | /* |
241 | * Atomic create+open operation | |
242 | * | |
243 | * If the filesystem doesn't support this, then fall back to separate | |
244 | * 'mknod' + 'open' requests. | |
245 | */ | |
fd72faac MS |
246 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, |
247 | struct nameidata *nd) | |
248 | { | |
249 | int err; | |
250 | struct inode *inode; | |
251 | struct fuse_conn *fc = get_fuse_conn(dir); | |
252 | struct fuse_req *req; | |
51eb01e7 | 253 | struct fuse_req *forget_req; |
fd72faac MS |
254 | struct fuse_open_in inarg; |
255 | struct fuse_open_out outopen; | |
256 | struct fuse_entry_out outentry; | |
fd72faac MS |
257 | struct fuse_file *ff; |
258 | struct file *file; | |
259 | int flags = nd->intent.open.flags - 1; | |
260 | ||
fd72faac | 261 | if (fc->no_create) |
ce1d5a49 | 262 | return -ENOSYS; |
fd72faac | 263 | |
51eb01e7 MS |
264 | forget_req = fuse_get_req(fc); |
265 | if (IS_ERR(forget_req)) | |
266 | return PTR_ERR(forget_req); | |
267 | ||
ce1d5a49 | 268 | req = fuse_get_req(fc); |
51eb01e7 | 269 | err = PTR_ERR(req); |
ce1d5a49 | 270 | if (IS_ERR(req)) |
51eb01e7 | 271 | goto out_put_forget_req; |
fd72faac | 272 | |
ce1d5a49 | 273 | err = -ENOMEM; |
fd72faac MS |
274 | ff = fuse_file_alloc(); |
275 | if (!ff) | |
276 | goto out_put_request; | |
277 | ||
278 | flags &= ~O_NOCTTY; | |
279 | memset(&inarg, 0, sizeof(inarg)); | |
280 | inarg.flags = flags; | |
281 | inarg.mode = mode; | |
282 | req->in.h.opcode = FUSE_CREATE; | |
283 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac MS |
284 | req->in.numargs = 2; |
285 | req->in.args[0].size = sizeof(inarg); | |
286 | req->in.args[0].value = &inarg; | |
287 | req->in.args[1].size = entry->d_name.len + 1; | |
288 | req->in.args[1].value = entry->d_name.name; | |
289 | req->out.numargs = 2; | |
290 | req->out.args[0].size = sizeof(outentry); | |
291 | req->out.args[0].value = &outentry; | |
292 | req->out.args[1].size = sizeof(outopen); | |
293 | req->out.args[1].value = &outopen; | |
294 | request_send(fc, req); | |
295 | err = req->out.h.error; | |
296 | if (err) { | |
297 | if (err == -ENOSYS) | |
298 | fc->no_create = 1; | |
299 | goto out_free_ff; | |
300 | } | |
301 | ||
302 | err = -EIO; | |
2827d0b2 | 303 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
304 | goto out_free_ff; |
305 | ||
51eb01e7 | 306 | fuse_put_request(fc, req); |
fd72faac MS |
307 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
308 | &outentry.attr); | |
fd72faac MS |
309 | if (!inode) { |
310 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
311 | ff->fh = outopen.fh; | |
51eb01e7 MS |
312 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
313 | fuse_send_forget(fc, forget_req, outentry.nodeid, 1); | |
314 | return -ENOMEM; | |
fd72faac | 315 | } |
51eb01e7 | 316 | fuse_put_request(fc, forget_req); |
fd72faac | 317 | d_instantiate(entry, inode); |
0aa7c699 | 318 | fuse_change_timeout(entry, &outentry); |
fd72faac MS |
319 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
320 | if (IS_ERR(file)) { | |
321 | ff->fh = outopen.fh; | |
51eb01e7 | 322 | fuse_sync_release(fc, ff, outentry.nodeid, flags); |
fd72faac MS |
323 | return PTR_ERR(file); |
324 | } | |
325 | fuse_finish_open(inode, file, ff, &outopen); | |
326 | return 0; | |
327 | ||
328 | out_free_ff: | |
329 | fuse_file_free(ff); | |
330 | out_put_request: | |
331 | fuse_put_request(fc, req); | |
51eb01e7 MS |
332 | out_put_forget_req: |
333 | fuse_put_request(fc, forget_req); | |
fd72faac MS |
334 | return err; |
335 | } | |
336 | ||
6f9f1180 MS |
337 | /* |
338 | * Code shared between mknod, mkdir, symlink and link | |
339 | */ | |
9e6268db MS |
340 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
341 | struct inode *dir, struct dentry *entry, | |
342 | int mode) | |
343 | { | |
344 | struct fuse_entry_out outarg; | |
345 | struct inode *inode; | |
9e6268db MS |
346 | int err; |
347 | ||
348 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
349 | req->out.numargs = 1; |
350 | req->out.args[0].size = sizeof(outarg); | |
351 | req->out.args[0].value = &outarg; | |
352 | request_send(fc, req); | |
353 | err = req->out.h.error; | |
354 | if (err) { | |
355 | fuse_put_request(fc, req); | |
356 | return err; | |
357 | } | |
39ee059a MS |
358 | err = -EIO; |
359 | if (invalid_nodeid(outarg.nodeid)) | |
360 | goto out_put_request; | |
361 | ||
362 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
363 | goto out_put_request; | |
364 | ||
9e6268db MS |
365 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
366 | &outarg.attr); | |
367 | if (!inode) { | |
368 | fuse_send_forget(fc, req, outarg.nodeid, 1); | |
369 | return -ENOMEM; | |
370 | } | |
371 | fuse_put_request(fc, req); | |
372 | ||
39ee059a | 373 | if (dir_alias(inode)) { |
9e6268db MS |
374 | iput(inode); |
375 | return -EIO; | |
376 | } | |
377 | ||
9e6268db | 378 | d_instantiate(entry, inode); |
0aa7c699 | 379 | fuse_change_timeout(entry, &outarg); |
9e6268db MS |
380 | fuse_invalidate_attr(dir); |
381 | return 0; | |
39ee059a MS |
382 | |
383 | out_put_request: | |
384 | fuse_put_request(fc, req); | |
385 | return err; | |
9e6268db MS |
386 | } |
387 | ||
388 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
389 | dev_t rdev) | |
390 | { | |
391 | struct fuse_mknod_in inarg; | |
392 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
393 | struct fuse_req *req = fuse_get_req(fc); |
394 | if (IS_ERR(req)) | |
395 | return PTR_ERR(req); | |
9e6268db MS |
396 | |
397 | memset(&inarg, 0, sizeof(inarg)); | |
398 | inarg.mode = mode; | |
399 | inarg.rdev = new_encode_dev(rdev); | |
400 | req->in.h.opcode = FUSE_MKNOD; | |
401 | req->in.numargs = 2; | |
402 | req->in.args[0].size = sizeof(inarg); | |
403 | req->in.args[0].value = &inarg; | |
404 | req->in.args[1].size = entry->d_name.len + 1; | |
405 | req->in.args[1].value = entry->d_name.name; | |
406 | return create_new_entry(fc, req, dir, entry, mode); | |
407 | } | |
408 | ||
409 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
410 | struct nameidata *nd) | |
411 | { | |
fd72faac MS |
412 | if (nd && (nd->flags & LOOKUP_CREATE)) { |
413 | int err = fuse_create_open(dir, entry, mode, nd); | |
414 | if (err != -ENOSYS) | |
415 | return err; | |
416 | /* Fall back on mknod */ | |
417 | } | |
9e6268db MS |
418 | return fuse_mknod(dir, entry, mode, 0); |
419 | } | |
420 | ||
421 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
422 | { | |
423 | struct fuse_mkdir_in inarg; | |
424 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
425 | struct fuse_req *req = fuse_get_req(fc); |
426 | if (IS_ERR(req)) | |
427 | return PTR_ERR(req); | |
9e6268db MS |
428 | |
429 | memset(&inarg, 0, sizeof(inarg)); | |
430 | inarg.mode = mode; | |
431 | req->in.h.opcode = FUSE_MKDIR; | |
432 | req->in.numargs = 2; | |
433 | req->in.args[0].size = sizeof(inarg); | |
434 | req->in.args[0].value = &inarg; | |
435 | req->in.args[1].size = entry->d_name.len + 1; | |
436 | req->in.args[1].value = entry->d_name.name; | |
437 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
438 | } | |
439 | ||
440 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
441 | const char *link) | |
442 | { | |
443 | struct fuse_conn *fc = get_fuse_conn(dir); | |
444 | unsigned len = strlen(link) + 1; | |
ce1d5a49 MS |
445 | struct fuse_req *req = fuse_get_req(fc); |
446 | if (IS_ERR(req)) | |
447 | return PTR_ERR(req); | |
9e6268db MS |
448 | |
449 | req->in.h.opcode = FUSE_SYMLINK; | |
450 | req->in.numargs = 2; | |
451 | req->in.args[0].size = entry->d_name.len + 1; | |
452 | req->in.args[0].value = entry->d_name.name; | |
453 | req->in.args[1].size = len; | |
454 | req->in.args[1].value = link; | |
455 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
456 | } | |
457 | ||
458 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
459 | { | |
460 | int err; | |
461 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
462 | struct fuse_req *req = fuse_get_req(fc); |
463 | if (IS_ERR(req)) | |
464 | return PTR_ERR(req); | |
9e6268db MS |
465 | |
466 | req->in.h.opcode = FUSE_UNLINK; | |
467 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
468 | req->in.numargs = 1; |
469 | req->in.args[0].size = entry->d_name.len + 1; | |
470 | req->in.args[0].value = entry->d_name.name; | |
471 | request_send(fc, req); | |
472 | err = req->out.h.error; | |
473 | fuse_put_request(fc, req); | |
474 | if (!err) { | |
475 | struct inode *inode = entry->d_inode; | |
476 | ||
477 | /* Set nlink to zero so the inode can be cleared, if | |
478 | the inode does have more links this will be | |
479 | discovered at the next lookup/getattr */ | |
480 | inode->i_nlink = 0; | |
481 | fuse_invalidate_attr(inode); | |
482 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 483 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
484 | } else if (err == -EINTR) |
485 | fuse_invalidate_entry(entry); | |
486 | return err; | |
487 | } | |
488 | ||
489 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
490 | { | |
491 | int err; | |
492 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
493 | struct fuse_req *req = fuse_get_req(fc); |
494 | if (IS_ERR(req)) | |
495 | return PTR_ERR(req); | |
9e6268db MS |
496 | |
497 | req->in.h.opcode = FUSE_RMDIR; | |
498 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
499 | req->in.numargs = 1; |
500 | req->in.args[0].size = entry->d_name.len + 1; | |
501 | req->in.args[0].value = entry->d_name.name; | |
502 | request_send(fc, req); | |
503 | err = req->out.h.error; | |
504 | fuse_put_request(fc, req); | |
505 | if (!err) { | |
506 | entry->d_inode->i_nlink = 0; | |
507 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 508 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
509 | } else if (err == -EINTR) |
510 | fuse_invalidate_entry(entry); | |
511 | return err; | |
512 | } | |
513 | ||
514 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
515 | struct inode *newdir, struct dentry *newent) | |
516 | { | |
517 | int err; | |
518 | struct fuse_rename_in inarg; | |
519 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 MS |
520 | struct fuse_req *req = fuse_get_req(fc); |
521 | if (IS_ERR(req)) | |
522 | return PTR_ERR(req); | |
9e6268db MS |
523 | |
524 | memset(&inarg, 0, sizeof(inarg)); | |
525 | inarg.newdir = get_node_id(newdir); | |
526 | req->in.h.opcode = FUSE_RENAME; | |
527 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
528 | req->in.numargs = 3; |
529 | req->in.args[0].size = sizeof(inarg); | |
530 | req->in.args[0].value = &inarg; | |
531 | req->in.args[1].size = oldent->d_name.len + 1; | |
532 | req->in.args[1].value = oldent->d_name.name; | |
533 | req->in.args[2].size = newent->d_name.len + 1; | |
534 | req->in.args[2].value = newent->d_name.name; | |
535 | request_send(fc, req); | |
536 | err = req->out.h.error; | |
537 | fuse_put_request(fc, req); | |
538 | if (!err) { | |
539 | fuse_invalidate_attr(olddir); | |
540 | if (olddir != newdir) | |
541 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
542 | |
543 | /* newent will end up negative */ | |
544 | if (newent->d_inode) | |
545 | fuse_invalidate_entry_cache(newent); | |
9e6268db MS |
546 | } else if (err == -EINTR) { |
547 | /* If request was interrupted, DEITY only knows if the | |
548 | rename actually took place. If the invalidation | |
549 | fails (e.g. some process has CWD under the renamed | |
550 | directory), then there can be inconsistency between | |
551 | the dcache and the real filesystem. Tough luck. */ | |
552 | fuse_invalidate_entry(oldent); | |
553 | if (newent->d_inode) | |
554 | fuse_invalidate_entry(newent); | |
555 | } | |
556 | ||
557 | return err; | |
558 | } | |
559 | ||
560 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
561 | struct dentry *newent) | |
562 | { | |
563 | int err; | |
564 | struct fuse_link_in inarg; | |
565 | struct inode *inode = entry->d_inode; | |
566 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
567 | struct fuse_req *req = fuse_get_req(fc); |
568 | if (IS_ERR(req)) | |
569 | return PTR_ERR(req); | |
9e6268db MS |
570 | |
571 | memset(&inarg, 0, sizeof(inarg)); | |
572 | inarg.oldnodeid = get_node_id(inode); | |
573 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
574 | req->in.numargs = 2; |
575 | req->in.args[0].size = sizeof(inarg); | |
576 | req->in.args[0].value = &inarg; | |
577 | req->in.args[1].size = newent->d_name.len + 1; | |
578 | req->in.args[1].value = newent->d_name.name; | |
579 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
580 | /* Contrary to "normal" filesystems it can happen that link | |
581 | makes two "logical" inodes point to the same "physical" | |
582 | inode. We invalidate the attributes of the old one, so it | |
583 | will reflect changes in the backing inode (link count, | |
584 | etc.) | |
585 | */ | |
586 | if (!err || err == -EINTR) | |
587 | fuse_invalidate_attr(inode); | |
588 | return err; | |
589 | } | |
590 | ||
e5e5558e MS |
591 | int fuse_do_getattr(struct inode *inode) |
592 | { | |
593 | int err; | |
594 | struct fuse_attr_out arg; | |
595 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
596 | struct fuse_req *req = fuse_get_req(fc); |
597 | if (IS_ERR(req)) | |
598 | return PTR_ERR(req); | |
e5e5558e MS |
599 | |
600 | req->in.h.opcode = FUSE_GETATTR; | |
601 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
602 | req->out.numargs = 1; |
603 | req->out.args[0].size = sizeof(arg); | |
604 | req->out.args[0].value = &arg; | |
605 | request_send(fc, req); | |
606 | err = req->out.h.error; | |
607 | fuse_put_request(fc, req); | |
608 | if (!err) { | |
609 | if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) { | |
610 | make_bad_inode(inode); | |
611 | err = -EIO; | |
612 | } else { | |
613 | struct fuse_inode *fi = get_fuse_inode(inode); | |
614 | fuse_change_attributes(inode, &arg.attr); | |
615 | fi->i_time = time_to_jiffies(arg.attr_valid, | |
616 | arg.attr_valid_nsec); | |
617 | } | |
618 | } | |
619 | return err; | |
620 | } | |
621 | ||
87729a55 MS |
622 | /* |
623 | * Calling into a user-controlled filesystem gives the filesystem | |
624 | * daemon ptrace-like capabilities over the requester process. This | |
625 | * means, that the filesystem daemon is able to record the exact | |
626 | * filesystem operations performed, and can also control the behavior | |
627 | * of the requester process in otherwise impossible ways. For example | |
628 | * it can delay the operation for arbitrary length of time allowing | |
629 | * DoS against the requester. | |
630 | * | |
631 | * For this reason only those processes can call into the filesystem, | |
632 | * for which the owner of the mount has ptrace privilege. This | |
633 | * excludes processes started by other users, suid or sgid processes. | |
634 | */ | |
635 | static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) | |
636 | { | |
637 | if (fc->flags & FUSE_ALLOW_OTHER) | |
638 | return 1; | |
639 | ||
640 | if (task->euid == fc->user_id && | |
641 | task->suid == fc->user_id && | |
642 | task->uid == fc->user_id && | |
643 | task->egid == fc->group_id && | |
644 | task->sgid == fc->group_id && | |
645 | task->gid == fc->group_id) | |
646 | return 1; | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
6f9f1180 MS |
651 | /* |
652 | * Check whether the inode attributes are still valid | |
653 | * | |
654 | * If the attribute validity timeout has expired, then fetch the fresh | |
655 | * attributes with a 'getattr' request | |
656 | * | |
657 | * I'm not sure why cached attributes are never returned for the root | |
658 | * inode, this is probably being too cautious. | |
659 | */ | |
e5e5558e MS |
660 | static int fuse_revalidate(struct dentry *entry) |
661 | { | |
662 | struct inode *inode = entry->d_inode; | |
663 | struct fuse_inode *fi = get_fuse_inode(inode); | |
664 | struct fuse_conn *fc = get_fuse_conn(inode); | |
665 | ||
87729a55 MS |
666 | if (!fuse_allow_task(fc, current)) |
667 | return -EACCES; | |
668 | if (get_node_id(inode) != FUSE_ROOT_ID && | |
669 | time_before_eq(jiffies, fi->i_time)) | |
e5e5558e MS |
670 | return 0; |
671 | ||
672 | return fuse_do_getattr(inode); | |
673 | } | |
674 | ||
31d40d74 MS |
675 | static int fuse_access(struct inode *inode, int mask) |
676 | { | |
677 | struct fuse_conn *fc = get_fuse_conn(inode); | |
678 | struct fuse_req *req; | |
679 | struct fuse_access_in inarg; | |
680 | int err; | |
681 | ||
682 | if (fc->no_access) | |
683 | return 0; | |
684 | ||
ce1d5a49 MS |
685 | req = fuse_get_req(fc); |
686 | if (IS_ERR(req)) | |
687 | return PTR_ERR(req); | |
31d40d74 MS |
688 | |
689 | memset(&inarg, 0, sizeof(inarg)); | |
690 | inarg.mask = mask; | |
691 | req->in.h.opcode = FUSE_ACCESS; | |
692 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
693 | req->in.numargs = 1; |
694 | req->in.args[0].size = sizeof(inarg); | |
695 | req->in.args[0].value = &inarg; | |
696 | request_send(fc, req); | |
697 | err = req->out.h.error; | |
698 | fuse_put_request(fc, req); | |
699 | if (err == -ENOSYS) { | |
700 | fc->no_access = 1; | |
701 | err = 0; | |
702 | } | |
703 | return err; | |
704 | } | |
705 | ||
6f9f1180 MS |
706 | /* |
707 | * Check permission. The two basic access models of FUSE are: | |
708 | * | |
709 | * 1) Local access checking ('default_permissions' mount option) based | |
710 | * on file mode. This is the plain old disk filesystem permission | |
711 | * modell. | |
712 | * | |
713 | * 2) "Remote" access checking, where server is responsible for | |
714 | * checking permission in each inode operation. An exception to this | |
715 | * is if ->permission() was invoked from sys_access() in which case an | |
716 | * access request is sent. Execute permission is still checked | |
717 | * locally based on file mode. | |
718 | */ | |
e5e5558e MS |
719 | static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) |
720 | { | |
721 | struct fuse_conn *fc = get_fuse_conn(inode); | |
722 | ||
87729a55 | 723 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 724 | return -EACCES; |
1e9a4ed9 MS |
725 | else if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
726 | int err = generic_permission(inode, mask, NULL); | |
727 | ||
728 | /* If permission is denied, try to refresh file | |
729 | attributes. This is also needed, because the root | |
730 | node will at first have no permissions */ | |
731 | if (err == -EACCES) { | |
732 | err = fuse_do_getattr(inode); | |
733 | if (!err) | |
734 | err = generic_permission(inode, mask, NULL); | |
735 | } | |
736 | ||
6f9f1180 MS |
737 | /* Note: the opposite of the above test does not |
738 | exist. So if permissions are revoked this won't be | |
739 | noticed immediately, only after the attribute | |
740 | timeout has expired */ | |
1e9a4ed9 MS |
741 | |
742 | return err; | |
743 | } else { | |
e5e5558e | 744 | int mode = inode->i_mode; |
e5e5558e MS |
745 | if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO)) |
746 | return -EACCES; | |
31d40d74 MS |
747 | |
748 | if (nd && (nd->flags & LOOKUP_ACCESS)) | |
749 | return fuse_access(inode, mask); | |
e5e5558e MS |
750 | return 0; |
751 | } | |
752 | } | |
753 | ||
754 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
755 | void *dstbuf, filldir_t filldir) | |
756 | { | |
757 | while (nbytes >= FUSE_NAME_OFFSET) { | |
758 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
759 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
760 | int over; | |
761 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
762 | return -EIO; | |
763 | if (reclen > nbytes) | |
764 | break; | |
765 | ||
766 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
767 | file->f_pos, dirent->ino, dirent->type); | |
768 | if (over) | |
769 | break; | |
770 | ||
771 | buf += reclen; | |
772 | nbytes -= reclen; | |
773 | file->f_pos = dirent->off; | |
774 | } | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
04730fef | 779 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 780 | { |
04730fef MS |
781 | int err; |
782 | size_t nbytes; | |
783 | struct page *page; | |
e5e5558e MS |
784 | struct inode *inode = file->f_dentry->d_inode; |
785 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 MS |
786 | struct fuse_req *req; |
787 | ||
788 | if (is_bad_inode(inode)) | |
789 | return -EIO; | |
790 | ||
ce1d5a49 MS |
791 | req = fuse_get_req(fc); |
792 | if (IS_ERR(req)) | |
793 | return PTR_ERR(req); | |
e5e5558e | 794 | |
04730fef MS |
795 | page = alloc_page(GFP_KERNEL); |
796 | if (!page) { | |
797 | fuse_put_request(fc, req); | |
798 | return -ENOMEM; | |
799 | } | |
800 | req->num_pages = 1; | |
801 | req->pages[0] = page; | |
361b1eb5 MS |
802 | fuse_read_fill(req, file, inode, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
803 | request_send(fc, req); | |
804 | nbytes = req->out.args[0].size; | |
e5e5558e MS |
805 | err = req->out.h.error; |
806 | fuse_put_request(fc, req); | |
807 | if (!err) | |
04730fef MS |
808 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
809 | filldir); | |
e5e5558e | 810 | |
04730fef | 811 | __free_page(page); |
b36c31ba | 812 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 813 | return err; |
e5e5558e MS |
814 | } |
815 | ||
816 | static char *read_link(struct dentry *dentry) | |
817 | { | |
818 | struct inode *inode = dentry->d_inode; | |
819 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 820 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
821 | char *link; |
822 | ||
ce1d5a49 MS |
823 | if (IS_ERR(req)) |
824 | return ERR_PTR(PTR_ERR(req)); | |
e5e5558e MS |
825 | |
826 | link = (char *) __get_free_page(GFP_KERNEL); | |
827 | if (!link) { | |
828 | link = ERR_PTR(-ENOMEM); | |
829 | goto out; | |
830 | } | |
831 | req->in.h.opcode = FUSE_READLINK; | |
832 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
833 | req->out.argvar = 1; |
834 | req->out.numargs = 1; | |
835 | req->out.args[0].size = PAGE_SIZE - 1; | |
836 | req->out.args[0].value = link; | |
837 | request_send(fc, req); | |
838 | if (req->out.h.error) { | |
839 | free_page((unsigned long) link); | |
840 | link = ERR_PTR(req->out.h.error); | |
841 | } else | |
842 | link[req->out.args[0].size] = '\0'; | |
843 | out: | |
844 | fuse_put_request(fc, req); | |
b36c31ba | 845 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
846 | return link; |
847 | } | |
848 | ||
849 | static void free_link(char *link) | |
850 | { | |
851 | if (!IS_ERR(link)) | |
852 | free_page((unsigned long) link); | |
853 | } | |
854 | ||
855 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
856 | { | |
857 | nd_set_link(nd, read_link(dentry)); | |
858 | return NULL; | |
859 | } | |
860 | ||
861 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
862 | { | |
863 | free_link(nd_get_link(nd)); | |
864 | } | |
865 | ||
866 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
867 | { | |
04730fef | 868 | return fuse_open_common(inode, file, 1); |
e5e5558e MS |
869 | } |
870 | ||
871 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
872 | { | |
04730fef | 873 | return fuse_release_common(inode, file, 1); |
e5e5558e MS |
874 | } |
875 | ||
82547981 MS |
876 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) |
877 | { | |
878 | /* nfsd can call this with no file */ | |
879 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; | |
880 | } | |
881 | ||
befc649c | 882 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
883 | { |
884 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
885 | |
886 | if (ivalid & ATTR_MODE) | |
befc649c | 887 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 888 | if (ivalid & ATTR_UID) |
befc649c | 889 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 890 | if (ivalid & ATTR_GID) |
befc649c | 891 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 892 | if (ivalid & ATTR_SIZE) |
befc649c | 893 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
9e6268db MS |
894 | /* You can only _set_ these together (they may change by themselves) */ |
895 | if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) { | |
befc649c MS |
896 | arg->valid |= FATTR_ATIME | FATTR_MTIME; |
897 | arg->atime = iattr->ia_atime.tv_sec; | |
898 | arg->mtime = iattr->ia_mtime.tv_sec; | |
899 | } | |
900 | if (ivalid & ATTR_FILE) { | |
901 | struct fuse_file *ff = iattr->ia_file->private_data; | |
902 | arg->valid |= FATTR_FH; | |
903 | arg->fh = ff->fh; | |
9e6268db | 904 | } |
9e6268db MS |
905 | } |
906 | ||
6f9f1180 MS |
907 | /* |
908 | * Set attributes, and at the same time refresh them. | |
909 | * | |
910 | * Truncation is slightly complicated, because the 'truncate' request | |
911 | * may fail, in which case we don't want to touch the mapping. | |
912 | * vmtruncate() doesn't allow for this case. So do the rlimit | |
913 | * checking by hand and call vmtruncate() only after the file has | |
914 | * actually been truncated. | |
915 | */ | |
9e6268db MS |
916 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
917 | { | |
918 | struct inode *inode = entry->d_inode; | |
919 | struct fuse_conn *fc = get_fuse_conn(inode); | |
920 | struct fuse_inode *fi = get_fuse_inode(inode); | |
921 | struct fuse_req *req; | |
922 | struct fuse_setattr_in inarg; | |
923 | struct fuse_attr_out outarg; | |
924 | int err; | |
925 | int is_truncate = 0; | |
926 | ||
1e9a4ed9 MS |
927 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
928 | err = inode_change_ok(inode, attr); | |
929 | if (err) | |
930 | return err; | |
931 | } | |
932 | ||
9e6268db MS |
933 | if (attr->ia_valid & ATTR_SIZE) { |
934 | unsigned long limit; | |
935 | is_truncate = 1; | |
936 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; | |
937 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { | |
938 | send_sig(SIGXFSZ, current, 0); | |
939 | return -EFBIG; | |
940 | } | |
941 | } | |
942 | ||
ce1d5a49 MS |
943 | req = fuse_get_req(fc); |
944 | if (IS_ERR(req)) | |
945 | return PTR_ERR(req); | |
9e6268db MS |
946 | |
947 | memset(&inarg, 0, sizeof(inarg)); | |
befc649c | 948 | iattr_to_fattr(attr, &inarg); |
9e6268db MS |
949 | req->in.h.opcode = FUSE_SETATTR; |
950 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
951 | req->in.numargs = 1; |
952 | req->in.args[0].size = sizeof(inarg); | |
953 | req->in.args[0].value = &inarg; | |
954 | req->out.numargs = 1; | |
955 | req->out.args[0].size = sizeof(outarg); | |
956 | req->out.args[0].value = &outarg; | |
957 | request_send(fc, req); | |
958 | err = req->out.h.error; | |
959 | fuse_put_request(fc, req); | |
960 | if (!err) { | |
961 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
962 | make_bad_inode(inode); | |
963 | err = -EIO; | |
964 | } else { | |
965 | if (is_truncate) { | |
966 | loff_t origsize = i_size_read(inode); | |
967 | i_size_write(inode, outarg.attr.size); | |
968 | if (origsize > outarg.attr.size) | |
969 | vmtruncate(inode, outarg.attr.size); | |
970 | } | |
971 | fuse_change_attributes(inode, &outarg.attr); | |
972 | fi->i_time = time_to_jiffies(outarg.attr_valid, | |
973 | outarg.attr_valid_nsec); | |
974 | } | |
975 | } else if (err == -EINTR) | |
976 | fuse_invalidate_attr(inode); | |
977 | ||
978 | return err; | |
979 | } | |
980 | ||
e5e5558e MS |
981 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
982 | struct kstat *stat) | |
983 | { | |
984 | struct inode *inode = entry->d_inode; | |
985 | int err = fuse_revalidate(entry); | |
986 | if (!err) | |
987 | generic_fillattr(inode, stat); | |
988 | ||
989 | return err; | |
990 | } | |
991 | ||
92a8780e MS |
992 | static int fuse_setxattr(struct dentry *entry, const char *name, |
993 | const void *value, size_t size, int flags) | |
994 | { | |
995 | struct inode *inode = entry->d_inode; | |
996 | struct fuse_conn *fc = get_fuse_conn(inode); | |
997 | struct fuse_req *req; | |
998 | struct fuse_setxattr_in inarg; | |
999 | int err; | |
1000 | ||
92a8780e MS |
1001 | if (fc->no_setxattr) |
1002 | return -EOPNOTSUPP; | |
1003 | ||
ce1d5a49 MS |
1004 | req = fuse_get_req(fc); |
1005 | if (IS_ERR(req)) | |
1006 | return PTR_ERR(req); | |
92a8780e MS |
1007 | |
1008 | memset(&inarg, 0, sizeof(inarg)); | |
1009 | inarg.size = size; | |
1010 | inarg.flags = flags; | |
1011 | req->in.h.opcode = FUSE_SETXATTR; | |
1012 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1013 | req->in.numargs = 3; |
1014 | req->in.args[0].size = sizeof(inarg); | |
1015 | req->in.args[0].value = &inarg; | |
1016 | req->in.args[1].size = strlen(name) + 1; | |
1017 | req->in.args[1].value = name; | |
1018 | req->in.args[2].size = size; | |
1019 | req->in.args[2].value = value; | |
1020 | request_send(fc, req); | |
1021 | err = req->out.h.error; | |
1022 | fuse_put_request(fc, req); | |
1023 | if (err == -ENOSYS) { | |
1024 | fc->no_setxattr = 1; | |
1025 | err = -EOPNOTSUPP; | |
1026 | } | |
1027 | return err; | |
1028 | } | |
1029 | ||
1030 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1031 | void *value, size_t size) | |
1032 | { | |
1033 | struct inode *inode = entry->d_inode; | |
1034 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1035 | struct fuse_req *req; | |
1036 | struct fuse_getxattr_in inarg; | |
1037 | struct fuse_getxattr_out outarg; | |
1038 | ssize_t ret; | |
1039 | ||
1040 | if (fc->no_getxattr) | |
1041 | return -EOPNOTSUPP; | |
1042 | ||
ce1d5a49 MS |
1043 | req = fuse_get_req(fc); |
1044 | if (IS_ERR(req)) | |
1045 | return PTR_ERR(req); | |
92a8780e MS |
1046 | |
1047 | memset(&inarg, 0, sizeof(inarg)); | |
1048 | inarg.size = size; | |
1049 | req->in.h.opcode = FUSE_GETXATTR; | |
1050 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1051 | req->in.numargs = 2; |
1052 | req->in.args[0].size = sizeof(inarg); | |
1053 | req->in.args[0].value = &inarg; | |
1054 | req->in.args[1].size = strlen(name) + 1; | |
1055 | req->in.args[1].value = name; | |
1056 | /* This is really two different operations rolled into one */ | |
1057 | req->out.numargs = 1; | |
1058 | if (size) { | |
1059 | req->out.argvar = 1; | |
1060 | req->out.args[0].size = size; | |
1061 | req->out.args[0].value = value; | |
1062 | } else { | |
1063 | req->out.args[0].size = sizeof(outarg); | |
1064 | req->out.args[0].value = &outarg; | |
1065 | } | |
1066 | request_send(fc, req); | |
1067 | ret = req->out.h.error; | |
1068 | if (!ret) | |
1069 | ret = size ? req->out.args[0].size : outarg.size; | |
1070 | else { | |
1071 | if (ret == -ENOSYS) { | |
1072 | fc->no_getxattr = 1; | |
1073 | ret = -EOPNOTSUPP; | |
1074 | } | |
1075 | } | |
1076 | fuse_put_request(fc, req); | |
1077 | return ret; | |
1078 | } | |
1079 | ||
1080 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1081 | { | |
1082 | struct inode *inode = entry->d_inode; | |
1083 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1084 | struct fuse_req *req; | |
1085 | struct fuse_getxattr_in inarg; | |
1086 | struct fuse_getxattr_out outarg; | |
1087 | ssize_t ret; | |
1088 | ||
1089 | if (fc->no_listxattr) | |
1090 | return -EOPNOTSUPP; | |
1091 | ||
ce1d5a49 MS |
1092 | req = fuse_get_req(fc); |
1093 | if (IS_ERR(req)) | |
1094 | return PTR_ERR(req); | |
92a8780e MS |
1095 | |
1096 | memset(&inarg, 0, sizeof(inarg)); | |
1097 | inarg.size = size; | |
1098 | req->in.h.opcode = FUSE_LISTXATTR; | |
1099 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1100 | req->in.numargs = 1; |
1101 | req->in.args[0].size = sizeof(inarg); | |
1102 | req->in.args[0].value = &inarg; | |
1103 | /* This is really two different operations rolled into one */ | |
1104 | req->out.numargs = 1; | |
1105 | if (size) { | |
1106 | req->out.argvar = 1; | |
1107 | req->out.args[0].size = size; | |
1108 | req->out.args[0].value = list; | |
1109 | } else { | |
1110 | req->out.args[0].size = sizeof(outarg); | |
1111 | req->out.args[0].value = &outarg; | |
1112 | } | |
1113 | request_send(fc, req); | |
1114 | ret = req->out.h.error; | |
1115 | if (!ret) | |
1116 | ret = size ? req->out.args[0].size : outarg.size; | |
1117 | else { | |
1118 | if (ret == -ENOSYS) { | |
1119 | fc->no_listxattr = 1; | |
1120 | ret = -EOPNOTSUPP; | |
1121 | } | |
1122 | } | |
1123 | fuse_put_request(fc, req); | |
1124 | return ret; | |
1125 | } | |
1126 | ||
1127 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1128 | { | |
1129 | struct inode *inode = entry->d_inode; | |
1130 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1131 | struct fuse_req *req; | |
1132 | int err; | |
1133 | ||
1134 | if (fc->no_removexattr) | |
1135 | return -EOPNOTSUPP; | |
1136 | ||
ce1d5a49 MS |
1137 | req = fuse_get_req(fc); |
1138 | if (IS_ERR(req)) | |
1139 | return PTR_ERR(req); | |
92a8780e MS |
1140 | |
1141 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1142 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1143 | req->in.numargs = 1; |
1144 | req->in.args[0].size = strlen(name) + 1; | |
1145 | req->in.args[0].value = name; | |
1146 | request_send(fc, req); | |
1147 | err = req->out.h.error; | |
1148 | fuse_put_request(fc, req); | |
1149 | if (err == -ENOSYS) { | |
1150 | fc->no_removexattr = 1; | |
1151 | err = -EOPNOTSUPP; | |
1152 | } | |
1153 | return err; | |
1154 | } | |
1155 | ||
e5e5558e MS |
1156 | static struct inode_operations fuse_dir_inode_operations = { |
1157 | .lookup = fuse_lookup, | |
9e6268db MS |
1158 | .mkdir = fuse_mkdir, |
1159 | .symlink = fuse_symlink, | |
1160 | .unlink = fuse_unlink, | |
1161 | .rmdir = fuse_rmdir, | |
1162 | .rename = fuse_rename, | |
1163 | .link = fuse_link, | |
1164 | .setattr = fuse_setattr, | |
1165 | .create = fuse_create, | |
1166 | .mknod = fuse_mknod, | |
e5e5558e MS |
1167 | .permission = fuse_permission, |
1168 | .getattr = fuse_getattr, | |
92a8780e MS |
1169 | .setxattr = fuse_setxattr, |
1170 | .getxattr = fuse_getxattr, | |
1171 | .listxattr = fuse_listxattr, | |
1172 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1173 | }; |
1174 | ||
4b6f5d20 | 1175 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1176 | .llseek = generic_file_llseek, |
e5e5558e MS |
1177 | .read = generic_read_dir, |
1178 | .readdir = fuse_readdir, | |
1179 | .open = fuse_dir_open, | |
1180 | .release = fuse_dir_release, | |
82547981 | 1181 | .fsync = fuse_dir_fsync, |
e5e5558e MS |
1182 | }; |
1183 | ||
1184 | static struct inode_operations fuse_common_inode_operations = { | |
9e6268db | 1185 | .setattr = fuse_setattr, |
e5e5558e MS |
1186 | .permission = fuse_permission, |
1187 | .getattr = fuse_getattr, | |
92a8780e MS |
1188 | .setxattr = fuse_setxattr, |
1189 | .getxattr = fuse_getxattr, | |
1190 | .listxattr = fuse_listxattr, | |
1191 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1192 | }; |
1193 | ||
1194 | static struct inode_operations fuse_symlink_inode_operations = { | |
9e6268db | 1195 | .setattr = fuse_setattr, |
e5e5558e MS |
1196 | .follow_link = fuse_follow_link, |
1197 | .put_link = fuse_put_link, | |
1198 | .readlink = generic_readlink, | |
1199 | .getattr = fuse_getattr, | |
92a8780e MS |
1200 | .setxattr = fuse_setxattr, |
1201 | .getxattr = fuse_getxattr, | |
1202 | .listxattr = fuse_listxattr, | |
1203 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1204 | }; |
1205 | ||
1206 | void fuse_init_common(struct inode *inode) | |
1207 | { | |
1208 | inode->i_op = &fuse_common_inode_operations; | |
1209 | } | |
1210 | ||
1211 | void fuse_init_dir(struct inode *inode) | |
1212 | { | |
1213 | inode->i_op = &fuse_dir_inode_operations; | |
1214 | inode->i_fop = &fuse_dir_operations; | |
1215 | } | |
1216 | ||
1217 | void fuse_init_symlink(struct inode *inode) | |
1218 | { | |
1219 | inode->i_op = &fuse_symlink_inode_operations; | |
1220 | } |