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Commit | Line | Data |
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e5e5558e MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 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> | |
e5e5558e MS |
13 | #include <linux/sched.h> |
14 | #include <linux/namei.h> | |
07e77dca | 15 | #include <linux/slab.h> |
e5e5558e | 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 | */ | |
dbd561d2 | 100 | void fuse_invalidate_entry_cache(struct dentry *entry) |
8cbdf1e6 | 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 | ||
c180eebe MS |
115 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_req *req, |
116 | u64 nodeid, struct qstr *name, | |
e5e5558e MS |
117 | struct fuse_entry_out *outarg) |
118 | { | |
0e9663ee | 119 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
e5e5558e | 120 | req->in.h.opcode = FUSE_LOOKUP; |
c180eebe | 121 | req->in.h.nodeid = nodeid; |
e5e5558e | 122 | req->in.numargs = 1; |
c180eebe MS |
123 | req->in.args[0].size = name->len + 1; |
124 | req->in.args[0].value = name->name; | |
e5e5558e | 125 | req->out.numargs = 1; |
0e9663ee MS |
126 | if (fc->minor < 9) |
127 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
128 | else | |
129 | req->out.args[0].size = sizeof(struct fuse_entry_out); | |
e5e5558e MS |
130 | req->out.args[0].value = outarg; |
131 | } | |
132 | ||
5c5c5e51 | 133 | u64 fuse_get_attr_version(struct fuse_conn *fc) |
7dca9fd3 MS |
134 | { |
135 | u64 curr_version; | |
136 | ||
137 | /* | |
138 | * The spin lock isn't actually needed on 64bit archs, but we | |
139 | * don't yet care too much about such optimizations. | |
140 | */ | |
141 | spin_lock(&fc->lock); | |
142 | curr_version = fc->attr_version; | |
143 | spin_unlock(&fc->lock); | |
144 | ||
145 | return curr_version; | |
146 | } | |
147 | ||
6f9f1180 MS |
148 | /* |
149 | * Check whether the dentry is still valid | |
150 | * | |
151 | * If the entry validity timeout has expired and the dentry is | |
152 | * positive, try to redo the lookup. If the lookup results in a | |
153 | * different inode, then let the VFS invalidate the dentry and redo | |
154 | * the lookup once more. If the lookup results in the same inode, | |
155 | * then refresh the attributes, timeouts and mark the dentry valid. | |
156 | */ | |
e5e5558e MS |
157 | static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) |
158 | { | |
34286d66 | 159 | struct inode *inode; |
8cbdf1e6 | 160 | |
e7c0a167 | 161 | inode = ACCESS_ONCE(entry->d_inode); |
8cbdf1e6 | 162 | if (inode && is_bad_inode(inode)) |
e5e5558e | 163 | return 0; |
0a0898cf | 164 | else if (fuse_dentry_time(entry) < get_jiffies_64()) { |
e5e5558e | 165 | int err; |
e5e5558e | 166 | struct fuse_entry_out outarg; |
8cbdf1e6 MS |
167 | struct fuse_conn *fc; |
168 | struct fuse_req *req; | |
07e77dca | 169 | struct fuse_forget_link *forget; |
e956edd0 | 170 | struct dentry *parent; |
1fb69e78 | 171 | u64 attr_version; |
8cbdf1e6 | 172 | |
50322fe7 | 173 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 MS |
174 | if (!inode) |
175 | return 0; | |
176 | ||
e7c0a167 MS |
177 | if (nd->flags & LOOKUP_RCU) |
178 | return -ECHILD; | |
179 | ||
8cbdf1e6 | 180 | fc = get_fuse_conn(inode); |
ce1d5a49 MS |
181 | req = fuse_get_req(fc); |
182 | if (IS_ERR(req)) | |
e5e5558e MS |
183 | return 0; |
184 | ||
07e77dca MS |
185 | forget = fuse_alloc_forget(); |
186 | if (!forget) { | |
2d51013e MS |
187 | fuse_put_request(fc, req); |
188 | return 0; | |
189 | } | |
190 | ||
7dca9fd3 | 191 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 192 | |
e956edd0 | 193 | parent = dget_parent(entry); |
c180eebe MS |
194 | fuse_lookup_init(fc, req, get_node_id(parent->d_inode), |
195 | &entry->d_name, &outarg); | |
b93f858a | 196 | fuse_request_send(fc, req); |
e956edd0 | 197 | dput(parent); |
e5e5558e | 198 | err = req->out.h.error; |
2d51013e | 199 | fuse_put_request(fc, req); |
50322fe7 MS |
200 | /* Zero nodeid is same as -ENOENT */ |
201 | if (!err && !outarg.nodeid) | |
202 | err = -ENOENT; | |
9e6268db | 203 | if (!err) { |
8cbdf1e6 | 204 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 205 | if (outarg.nodeid != get_node_id(inode)) { |
07e77dca | 206 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
207 | return 0; |
208 | } | |
8da5ff23 | 209 | spin_lock(&fc->lock); |
1729a16c | 210 | fi->nlookup++; |
8da5ff23 | 211 | spin_unlock(&fc->lock); |
9e6268db | 212 | } |
07e77dca | 213 | kfree(forget); |
9e6268db | 214 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
215 | return 0; |
216 | ||
1fb69e78 MS |
217 | fuse_change_attributes(inode, &outarg.attr, |
218 | entry_attr_timeout(&outarg), | |
219 | attr_version); | |
220 | fuse_change_entry_timeout(entry, &outarg); | |
e5e5558e MS |
221 | } |
222 | return 1; | |
223 | } | |
224 | ||
8bfc016d | 225 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
226 | { |
227 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
228 | } | |
229 | ||
4269590a | 230 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e MS |
231 | .d_revalidate = fuse_dentry_revalidate, |
232 | }; | |
233 | ||
a5bfffac | 234 | int fuse_valid_type(int m) |
39ee059a MS |
235 | { |
236 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
237 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
238 | } | |
239 | ||
d2a85164 MS |
240 | /* |
241 | * Add a directory inode to a dentry, ensuring that no other dentry | |
242 | * refers to this inode. Called with fc->inst_mutex. | |
243 | */ | |
0de6256d MS |
244 | static struct dentry *fuse_d_add_directory(struct dentry *entry, |
245 | struct inode *inode) | |
d2a85164 MS |
246 | { |
247 | struct dentry *alias = d_find_alias(inode); | |
0de6256d | 248 | if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) { |
d2a85164 MS |
249 | /* This tries to shrink the subtree below alias */ |
250 | fuse_invalidate_entry(alias); | |
251 | dput(alias); | |
252 | if (!list_empty(&inode->i_dentry)) | |
0de6256d MS |
253 | return ERR_PTR(-EBUSY); |
254 | } else { | |
255 | dput(alias); | |
d2a85164 | 256 | } |
0de6256d | 257 | return d_splice_alias(inode, entry); |
d2a85164 MS |
258 | } |
259 | ||
c180eebe MS |
260 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, |
261 | struct fuse_entry_out *outarg, struct inode **inode) | |
e5e5558e | 262 | { |
c180eebe | 263 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
e5e5558e | 264 | struct fuse_req *req; |
07e77dca | 265 | struct fuse_forget_link *forget; |
1fb69e78 | 266 | u64 attr_version; |
c180eebe | 267 | int err; |
e5e5558e | 268 | |
c180eebe MS |
269 | *inode = NULL; |
270 | err = -ENAMETOOLONG; | |
271 | if (name->len > FUSE_NAME_MAX) | |
272 | goto out; | |
e5e5558e | 273 | |
ce1d5a49 | 274 | req = fuse_get_req(fc); |
c180eebe | 275 | err = PTR_ERR(req); |
ce1d5a49 | 276 | if (IS_ERR(req)) |
c180eebe | 277 | goto out; |
e5e5558e | 278 | |
07e77dca MS |
279 | forget = fuse_alloc_forget(); |
280 | err = -ENOMEM; | |
281 | if (!forget) { | |
2d51013e | 282 | fuse_put_request(fc, req); |
c180eebe | 283 | goto out; |
2d51013e MS |
284 | } |
285 | ||
7dca9fd3 | 286 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 287 | |
c180eebe | 288 | fuse_lookup_init(fc, req, nodeid, name, outarg); |
b93f858a | 289 | fuse_request_send(fc, req); |
e5e5558e | 290 | err = req->out.h.error; |
2d51013e | 291 | fuse_put_request(fc, req); |
50322fe7 | 292 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
293 | if (err || !outarg->nodeid) |
294 | goto out_put_forget; | |
295 | ||
296 | err = -EIO; | |
297 | if (!outarg->nodeid) | |
298 | goto out_put_forget; | |
299 | if (!fuse_valid_type(outarg->attr.mode)) | |
300 | goto out_put_forget; | |
301 | ||
302 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
303 | &outarg->attr, entry_attr_timeout(outarg), | |
304 | attr_version); | |
305 | err = -ENOMEM; | |
306 | if (!*inode) { | |
07e77dca | 307 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
c180eebe | 308 | goto out; |
e5e5558e | 309 | } |
c180eebe MS |
310 | err = 0; |
311 | ||
312 | out_put_forget: | |
07e77dca | 313 | kfree(forget); |
c180eebe MS |
314 | out: |
315 | return err; | |
316 | } | |
317 | ||
318 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
319 | struct nameidata *nd) | |
320 | { | |
321 | int err; | |
322 | struct fuse_entry_out outarg; | |
323 | struct inode *inode; | |
324 | struct dentry *newent; | |
325 | struct fuse_conn *fc = get_fuse_conn(dir); | |
326 | bool outarg_valid = true; | |
327 | ||
328 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, | |
329 | &outarg, &inode); | |
330 | if (err == -ENOENT) { | |
331 | outarg_valid = false; | |
332 | err = 0; | |
333 | } | |
334 | if (err) | |
335 | goto out_err; | |
336 | ||
337 | err = -EIO; | |
338 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
339 | goto out_iput; | |
e5e5558e | 340 | |
d2a85164 MS |
341 | if (inode && S_ISDIR(inode->i_mode)) { |
342 | mutex_lock(&fc->inst_mutex); | |
0de6256d | 343 | newent = fuse_d_add_directory(entry, inode); |
d2a85164 | 344 | mutex_unlock(&fc->inst_mutex); |
c180eebe MS |
345 | err = PTR_ERR(newent); |
346 | if (IS_ERR(newent)) | |
347 | goto out_iput; | |
348 | } else { | |
0de6256d | 349 | newent = d_splice_alias(inode, entry); |
c180eebe | 350 | } |
d2a85164 | 351 | |
0de6256d | 352 | entry = newent ? newent : entry; |
c180eebe | 353 | if (outarg_valid) |
1fb69e78 | 354 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
355 | else |
356 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 357 | |
0de6256d | 358 | return newent; |
c180eebe MS |
359 | |
360 | out_iput: | |
361 | iput(inode); | |
362 | out_err: | |
363 | return ERR_PTR(err); | |
e5e5558e MS |
364 | } |
365 | ||
6f9f1180 MS |
366 | /* |
367 | * Atomic create+open operation | |
368 | * | |
369 | * If the filesystem doesn't support this, then fall back to separate | |
370 | * 'mknod' + 'open' requests. | |
371 | */ | |
fd72faac MS |
372 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, |
373 | struct nameidata *nd) | |
374 | { | |
375 | int err; | |
376 | struct inode *inode; | |
377 | struct fuse_conn *fc = get_fuse_conn(dir); | |
378 | struct fuse_req *req; | |
07e77dca | 379 | struct fuse_forget_link *forget; |
e0a43ddc | 380 | struct fuse_create_in inarg; |
fd72faac MS |
381 | struct fuse_open_out outopen; |
382 | struct fuse_entry_out outentry; | |
fd72faac MS |
383 | struct fuse_file *ff; |
384 | struct file *file; | |
385 | int flags = nd->intent.open.flags - 1; | |
386 | ||
fd72faac | 387 | if (fc->no_create) |
ce1d5a49 | 388 | return -ENOSYS; |
fd72faac | 389 | |
1b732396 CH |
390 | if (flags & O_DIRECT) |
391 | return -EINVAL; | |
392 | ||
07e77dca MS |
393 | forget = fuse_alloc_forget(); |
394 | if (!forget) | |
395 | return -ENOMEM; | |
51eb01e7 | 396 | |
ce1d5a49 | 397 | req = fuse_get_req(fc); |
51eb01e7 | 398 | err = PTR_ERR(req); |
ce1d5a49 | 399 | if (IS_ERR(req)) |
51eb01e7 | 400 | goto out_put_forget_req; |
fd72faac | 401 | |
ce1d5a49 | 402 | err = -ENOMEM; |
acf99433 | 403 | ff = fuse_file_alloc(fc); |
fd72faac MS |
404 | if (!ff) |
405 | goto out_put_request; | |
406 | ||
e0a43ddc MS |
407 | if (!fc->dont_mask) |
408 | mode &= ~current_umask(); | |
409 | ||
fd72faac MS |
410 | flags &= ~O_NOCTTY; |
411 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 412 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
413 | inarg.flags = flags; |
414 | inarg.mode = mode; | |
e0a43ddc | 415 | inarg.umask = current_umask(); |
fd72faac MS |
416 | req->in.h.opcode = FUSE_CREATE; |
417 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac | 418 | req->in.numargs = 2; |
e0a43ddc MS |
419 | req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : |
420 | sizeof(inarg); | |
fd72faac MS |
421 | req->in.args[0].value = &inarg; |
422 | req->in.args[1].size = entry->d_name.len + 1; | |
423 | req->in.args[1].value = entry->d_name.name; | |
424 | req->out.numargs = 2; | |
0e9663ee MS |
425 | if (fc->minor < 9) |
426 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
427 | else | |
428 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
429 | req->out.args[0].value = &outentry; |
430 | req->out.args[1].size = sizeof(outopen); | |
431 | req->out.args[1].value = &outopen; | |
b93f858a | 432 | fuse_request_send(fc, req); |
fd72faac MS |
433 | err = req->out.h.error; |
434 | if (err) { | |
435 | if (err == -ENOSYS) | |
436 | fc->no_create = 1; | |
437 | goto out_free_ff; | |
438 | } | |
439 | ||
440 | err = -EIO; | |
2827d0b2 | 441 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
442 | goto out_free_ff; |
443 | ||
51eb01e7 | 444 | fuse_put_request(fc, req); |
c7b7143c MS |
445 | ff->fh = outopen.fh; |
446 | ff->nodeid = outentry.nodeid; | |
447 | ff->open_flags = outopen.open_flags; | |
fd72faac | 448 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 449 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
450 | if (!inode) { |
451 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 452 | fuse_sync_release(ff, flags); |
07e77dca | 453 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
51eb01e7 | 454 | return -ENOMEM; |
fd72faac | 455 | } |
07e77dca | 456 | kfree(forget); |
fd72faac | 457 | d_instantiate(entry, inode); |
1fb69e78 | 458 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 459 | fuse_invalidate_attr(dir); |
fd72faac MS |
460 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
461 | if (IS_ERR(file)) { | |
8b0797a4 | 462 | fuse_sync_release(ff, flags); |
fd72faac MS |
463 | return PTR_ERR(file); |
464 | } | |
c7b7143c MS |
465 | file->private_data = fuse_file_get(ff); |
466 | fuse_finish_open(inode, file); | |
fd72faac MS |
467 | return 0; |
468 | ||
469 | out_free_ff: | |
470 | fuse_file_free(ff); | |
471 | out_put_request: | |
472 | fuse_put_request(fc, req); | |
51eb01e7 | 473 | out_put_forget_req: |
07e77dca | 474 | kfree(forget); |
fd72faac MS |
475 | return err; |
476 | } | |
477 | ||
6f9f1180 MS |
478 | /* |
479 | * Code shared between mknod, mkdir, symlink and link | |
480 | */ | |
9e6268db MS |
481 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
482 | struct inode *dir, struct dentry *entry, | |
483 | int mode) | |
484 | { | |
485 | struct fuse_entry_out outarg; | |
486 | struct inode *inode; | |
9e6268db | 487 | int err; |
07e77dca | 488 | struct fuse_forget_link *forget; |
2d51013e | 489 | |
07e77dca MS |
490 | forget = fuse_alloc_forget(); |
491 | if (!forget) { | |
2d51013e | 492 | fuse_put_request(fc, req); |
07e77dca | 493 | return -ENOMEM; |
2d51013e | 494 | } |
9e6268db | 495 | |
0e9663ee | 496 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 497 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 498 | req->out.numargs = 1; |
0e9663ee MS |
499 | if (fc->minor < 9) |
500 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
501 | else | |
502 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 503 | req->out.args[0].value = &outarg; |
b93f858a | 504 | fuse_request_send(fc, req); |
9e6268db | 505 | err = req->out.h.error; |
2d51013e MS |
506 | fuse_put_request(fc, req); |
507 | if (err) | |
508 | goto out_put_forget_req; | |
509 | ||
39ee059a MS |
510 | err = -EIO; |
511 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 512 | goto out_put_forget_req; |
39ee059a MS |
513 | |
514 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 515 | goto out_put_forget_req; |
39ee059a | 516 | |
9e6268db | 517 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 518 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 519 | if (!inode) { |
07e77dca | 520 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
521 | return -ENOMEM; |
522 | } | |
07e77dca | 523 | kfree(forget); |
9e6268db | 524 | |
d2a85164 MS |
525 | if (S_ISDIR(inode->i_mode)) { |
526 | struct dentry *alias; | |
527 | mutex_lock(&fc->inst_mutex); | |
528 | alias = d_find_alias(inode); | |
529 | if (alias) { | |
530 | /* New directory must have moved since mkdir */ | |
531 | mutex_unlock(&fc->inst_mutex); | |
532 | dput(alias); | |
533 | iput(inode); | |
534 | return -EBUSY; | |
535 | } | |
536 | d_instantiate(entry, inode); | |
537 | mutex_unlock(&fc->inst_mutex); | |
538 | } else | |
539 | d_instantiate(entry, inode); | |
9e6268db | 540 | |
1fb69e78 | 541 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
542 | fuse_invalidate_attr(dir); |
543 | return 0; | |
39ee059a | 544 | |
2d51013e | 545 | out_put_forget_req: |
07e77dca | 546 | kfree(forget); |
39ee059a | 547 | return err; |
9e6268db MS |
548 | } |
549 | ||
550 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
551 | dev_t rdev) | |
552 | { | |
553 | struct fuse_mknod_in inarg; | |
554 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
555 | struct fuse_req *req = fuse_get_req(fc); |
556 | if (IS_ERR(req)) | |
557 | return PTR_ERR(req); | |
9e6268db | 558 | |
e0a43ddc MS |
559 | if (!fc->dont_mask) |
560 | mode &= ~current_umask(); | |
561 | ||
9e6268db MS |
562 | memset(&inarg, 0, sizeof(inarg)); |
563 | inarg.mode = mode; | |
564 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 565 | inarg.umask = current_umask(); |
9e6268db MS |
566 | req->in.h.opcode = FUSE_MKNOD; |
567 | req->in.numargs = 2; | |
e0a43ddc MS |
568 | req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : |
569 | sizeof(inarg); | |
9e6268db MS |
570 | req->in.args[0].value = &inarg; |
571 | req->in.args[1].size = entry->d_name.len + 1; | |
572 | req->in.args[1].value = entry->d_name.name; | |
573 | return create_new_entry(fc, req, dir, entry, mode); | |
574 | } | |
575 | ||
576 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
577 | struct nameidata *nd) | |
578 | { | |
b9ba347f | 579 | if (nd && (nd->flags & LOOKUP_OPEN)) { |
fd72faac MS |
580 | int err = fuse_create_open(dir, entry, mode, nd); |
581 | if (err != -ENOSYS) | |
582 | return err; | |
583 | /* Fall back on mknod */ | |
584 | } | |
9e6268db MS |
585 | return fuse_mknod(dir, entry, mode, 0); |
586 | } | |
587 | ||
588 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
589 | { | |
590 | struct fuse_mkdir_in inarg; | |
591 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
592 | struct fuse_req *req = fuse_get_req(fc); |
593 | if (IS_ERR(req)) | |
594 | return PTR_ERR(req); | |
9e6268db | 595 | |
e0a43ddc MS |
596 | if (!fc->dont_mask) |
597 | mode &= ~current_umask(); | |
598 | ||
9e6268db MS |
599 | memset(&inarg, 0, sizeof(inarg)); |
600 | inarg.mode = mode; | |
e0a43ddc | 601 | inarg.umask = current_umask(); |
9e6268db MS |
602 | req->in.h.opcode = FUSE_MKDIR; |
603 | req->in.numargs = 2; | |
604 | req->in.args[0].size = sizeof(inarg); | |
605 | req->in.args[0].value = &inarg; | |
606 | req->in.args[1].size = entry->d_name.len + 1; | |
607 | req->in.args[1].value = entry->d_name.name; | |
608 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
609 | } | |
610 | ||
611 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
612 | const char *link) | |
613 | { | |
614 | struct fuse_conn *fc = get_fuse_conn(dir); | |
615 | unsigned len = strlen(link) + 1; | |
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 | req->in.h.opcode = FUSE_SYMLINK; | |
621 | req->in.numargs = 2; | |
622 | req->in.args[0].size = entry->d_name.len + 1; | |
623 | req->in.args[0].value = entry->d_name.name; | |
624 | req->in.args[1].size = len; | |
625 | req->in.args[1].value = link; | |
626 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
627 | } | |
628 | ||
629 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
630 | { | |
631 | int err; | |
632 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
633 | struct fuse_req *req = fuse_get_req(fc); |
634 | if (IS_ERR(req)) | |
635 | return PTR_ERR(req); | |
9e6268db MS |
636 | |
637 | req->in.h.opcode = FUSE_UNLINK; | |
638 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
639 | req->in.numargs = 1; |
640 | req->in.args[0].size = entry->d_name.len + 1; | |
641 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 642 | fuse_request_send(fc, req); |
9e6268db MS |
643 | err = req->out.h.error; |
644 | fuse_put_request(fc, req); | |
645 | if (!err) { | |
646 | struct inode *inode = entry->d_inode; | |
647 | ||
1729a16c MS |
648 | /* |
649 | * Set nlink to zero so the inode can be cleared, if the inode | |
650 | * does have more links this will be discovered at the next | |
651 | * lookup/getattr. | |
652 | */ | |
ce71ec36 | 653 | clear_nlink(inode); |
9e6268db MS |
654 | fuse_invalidate_attr(inode); |
655 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 656 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
657 | } else if (err == -EINTR) |
658 | fuse_invalidate_entry(entry); | |
659 | return err; | |
660 | } | |
661 | ||
662 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
663 | { | |
664 | int err; | |
665 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
666 | struct fuse_req *req = fuse_get_req(fc); |
667 | if (IS_ERR(req)) | |
668 | return PTR_ERR(req); | |
9e6268db | 669 | |
79bf7c73 SW |
670 | dentry_unhash(entry); |
671 | ||
9e6268db MS |
672 | req->in.h.opcode = FUSE_RMDIR; |
673 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
674 | req->in.numargs = 1; |
675 | req->in.args[0].size = entry->d_name.len + 1; | |
676 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 677 | fuse_request_send(fc, req); |
9e6268db MS |
678 | err = req->out.h.error; |
679 | fuse_put_request(fc, req); | |
680 | if (!err) { | |
ce71ec36 | 681 | clear_nlink(entry->d_inode); |
9e6268db | 682 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 683 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
684 | } else if (err == -EINTR) |
685 | fuse_invalidate_entry(entry); | |
686 | return err; | |
687 | } | |
688 | ||
689 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
690 | struct inode *newdir, struct dentry *newent) | |
691 | { | |
692 | int err; | |
693 | struct fuse_rename_in inarg; | |
694 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 MS |
695 | struct fuse_req *req = fuse_get_req(fc); |
696 | if (IS_ERR(req)) | |
697 | return PTR_ERR(req); | |
9e6268db MS |
698 | |
699 | memset(&inarg, 0, sizeof(inarg)); | |
700 | inarg.newdir = get_node_id(newdir); | |
701 | req->in.h.opcode = FUSE_RENAME; | |
702 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
703 | req->in.numargs = 3; |
704 | req->in.args[0].size = sizeof(inarg); | |
705 | req->in.args[0].value = &inarg; | |
706 | req->in.args[1].size = oldent->d_name.len + 1; | |
707 | req->in.args[1].value = oldent->d_name.name; | |
708 | req->in.args[2].size = newent->d_name.len + 1; | |
709 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 710 | fuse_request_send(fc, req); |
9e6268db MS |
711 | err = req->out.h.error; |
712 | fuse_put_request(fc, req); | |
713 | if (!err) { | |
08b63307 MS |
714 | /* ctime changes */ |
715 | fuse_invalidate_attr(oldent->d_inode); | |
716 | ||
9e6268db MS |
717 | fuse_invalidate_attr(olddir); |
718 | if (olddir != newdir) | |
719 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
720 | |
721 | /* newent will end up negative */ | |
5219f346 MS |
722 | if (newent->d_inode) { |
723 | fuse_invalidate_attr(newent->d_inode); | |
8cbdf1e6 | 724 | fuse_invalidate_entry_cache(newent); |
5219f346 | 725 | } |
9e6268db MS |
726 | } else if (err == -EINTR) { |
727 | /* If request was interrupted, DEITY only knows if the | |
728 | rename actually took place. If the invalidation | |
729 | fails (e.g. some process has CWD under the renamed | |
730 | directory), then there can be inconsistency between | |
731 | the dcache and the real filesystem. Tough luck. */ | |
732 | fuse_invalidate_entry(oldent); | |
733 | if (newent->d_inode) | |
734 | fuse_invalidate_entry(newent); | |
735 | } | |
736 | ||
737 | return err; | |
738 | } | |
739 | ||
740 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
741 | struct dentry *newent) | |
742 | { | |
743 | int err; | |
744 | struct fuse_link_in inarg; | |
745 | struct inode *inode = entry->d_inode; | |
746 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
747 | struct fuse_req *req = fuse_get_req(fc); |
748 | if (IS_ERR(req)) | |
749 | return PTR_ERR(req); | |
9e6268db MS |
750 | |
751 | memset(&inarg, 0, sizeof(inarg)); | |
752 | inarg.oldnodeid = get_node_id(inode); | |
753 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
754 | req->in.numargs = 2; |
755 | req->in.args[0].size = sizeof(inarg); | |
756 | req->in.args[0].value = &inarg; | |
757 | req->in.args[1].size = newent->d_name.len + 1; | |
758 | req->in.args[1].value = newent->d_name.name; | |
759 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
760 | /* Contrary to "normal" filesystems it can happen that link | |
761 | makes two "logical" inodes point to the same "physical" | |
762 | inode. We invalidate the attributes of the old one, so it | |
763 | will reflect changes in the backing inode (link count, | |
764 | etc.) | |
765 | */ | |
766 | if (!err || err == -EINTR) | |
767 | fuse_invalidate_attr(inode); | |
768 | return err; | |
769 | } | |
770 | ||
1fb69e78 MS |
771 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
772 | struct kstat *stat) | |
773 | { | |
774 | stat->dev = inode->i_sb->s_dev; | |
775 | stat->ino = attr->ino; | |
776 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
777 | stat->nlink = attr->nlink; | |
778 | stat->uid = attr->uid; | |
779 | stat->gid = attr->gid; | |
780 | stat->rdev = inode->i_rdev; | |
781 | stat->atime.tv_sec = attr->atime; | |
782 | stat->atime.tv_nsec = attr->atimensec; | |
783 | stat->mtime.tv_sec = attr->mtime; | |
784 | stat->mtime.tv_nsec = attr->mtimensec; | |
785 | stat->ctime.tv_sec = attr->ctime; | |
786 | stat->ctime.tv_nsec = attr->ctimensec; | |
787 | stat->size = attr->size; | |
788 | stat->blocks = attr->blocks; | |
789 | stat->blksize = (1 << inode->i_blkbits); | |
790 | } | |
791 | ||
c79e322f MS |
792 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
793 | struct file *file) | |
e5e5558e MS |
794 | { |
795 | int err; | |
c79e322f MS |
796 | struct fuse_getattr_in inarg; |
797 | struct fuse_attr_out outarg; | |
e5e5558e | 798 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
799 | struct fuse_req *req; |
800 | u64 attr_version; | |
801 | ||
802 | req = fuse_get_req(fc); | |
ce1d5a49 MS |
803 | if (IS_ERR(req)) |
804 | return PTR_ERR(req); | |
e5e5558e | 805 | |
7dca9fd3 | 806 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 807 | |
c79e322f | 808 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 809 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
810 | /* Directories have separate file-handle space */ |
811 | if (file && S_ISREG(inode->i_mode)) { | |
812 | struct fuse_file *ff = file->private_data; | |
813 | ||
814 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
815 | inarg.fh = ff->fh; | |
816 | } | |
e5e5558e MS |
817 | req->in.h.opcode = FUSE_GETATTR; |
818 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
819 | req->in.numargs = 1; |
820 | req->in.args[0].size = sizeof(inarg); | |
821 | req->in.args[0].value = &inarg; | |
e5e5558e | 822 | req->out.numargs = 1; |
0e9663ee MS |
823 | if (fc->minor < 9) |
824 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
825 | else | |
826 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 827 | req->out.args[0].value = &outarg; |
b93f858a | 828 | fuse_request_send(fc, req); |
e5e5558e MS |
829 | err = req->out.h.error; |
830 | fuse_put_request(fc, req); | |
831 | if (!err) { | |
c79e322f | 832 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
833 | make_bad_inode(inode); |
834 | err = -EIO; | |
835 | } else { | |
c79e322f MS |
836 | fuse_change_attributes(inode, &outarg.attr, |
837 | attr_timeout(&outarg), | |
1fb69e78 MS |
838 | attr_version); |
839 | if (stat) | |
c79e322f | 840 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
841 | } |
842 | } | |
843 | return err; | |
844 | } | |
845 | ||
bcb4be80 MS |
846 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
847 | struct file *file, bool *refreshed) | |
848 | { | |
849 | struct fuse_inode *fi = get_fuse_inode(inode); | |
850 | int err; | |
851 | bool r; | |
852 | ||
853 | if (fi->i_time < get_jiffies_64()) { | |
854 | r = true; | |
855 | err = fuse_do_getattr(inode, stat, file); | |
856 | } else { | |
857 | r = false; | |
858 | err = 0; | |
859 | if (stat) { | |
860 | generic_fillattr(inode, stat); | |
861 | stat->mode = fi->orig_i_mode; | |
862 | } | |
863 | } | |
864 | ||
865 | if (refreshed != NULL) | |
866 | *refreshed = r; | |
867 | ||
868 | return err; | |
869 | } | |
870 | ||
3b463ae0 JM |
871 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
872 | struct qstr *name) | |
873 | { | |
874 | int err = -ENOTDIR; | |
875 | struct inode *parent; | |
876 | struct dentry *dir; | |
877 | struct dentry *entry; | |
878 | ||
879 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
880 | if (!parent) | |
881 | return -ENOENT; | |
882 | ||
883 | mutex_lock(&parent->i_mutex); | |
884 | if (!S_ISDIR(parent->i_mode)) | |
885 | goto unlock; | |
886 | ||
887 | err = -ENOENT; | |
888 | dir = d_find_alias(parent); | |
889 | if (!dir) | |
890 | goto unlock; | |
891 | ||
892 | entry = d_lookup(dir, name); | |
893 | dput(dir); | |
894 | if (!entry) | |
895 | goto unlock; | |
896 | ||
897 | fuse_invalidate_attr(parent); | |
898 | fuse_invalidate_entry(entry); | |
899 | dput(entry); | |
900 | err = 0; | |
901 | ||
902 | unlock: | |
903 | mutex_unlock(&parent->i_mutex); | |
904 | iput(parent); | |
905 | return err; | |
906 | } | |
907 | ||
87729a55 MS |
908 | /* |
909 | * Calling into a user-controlled filesystem gives the filesystem | |
910 | * daemon ptrace-like capabilities over the requester process. This | |
911 | * means, that the filesystem daemon is able to record the exact | |
912 | * filesystem operations performed, and can also control the behavior | |
913 | * of the requester process in otherwise impossible ways. For example | |
914 | * it can delay the operation for arbitrary length of time allowing | |
915 | * DoS against the requester. | |
916 | * | |
917 | * For this reason only those processes can call into the filesystem, | |
918 | * for which the owner of the mount has ptrace privilege. This | |
919 | * excludes processes started by other users, suid or sgid processes. | |
920 | */ | |
e57ac683 | 921 | int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) |
87729a55 | 922 | { |
c69e8d9c DH |
923 | const struct cred *cred; |
924 | int ret; | |
87729a55 | 925 | |
c69e8d9c | 926 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
927 | return 1; |
928 | ||
c69e8d9c DH |
929 | rcu_read_lock(); |
930 | ret = 0; | |
931 | cred = __task_cred(task); | |
932 | if (cred->euid == fc->user_id && | |
933 | cred->suid == fc->user_id && | |
934 | cred->uid == fc->user_id && | |
935 | cred->egid == fc->group_id && | |
936 | cred->sgid == fc->group_id && | |
937 | cred->gid == fc->group_id) | |
938 | ret = 1; | |
939 | rcu_read_unlock(); | |
940 | ||
941 | return ret; | |
87729a55 MS |
942 | } |
943 | ||
31d40d74 MS |
944 | static int fuse_access(struct inode *inode, int mask) |
945 | { | |
946 | struct fuse_conn *fc = get_fuse_conn(inode); | |
947 | struct fuse_req *req; | |
948 | struct fuse_access_in inarg; | |
949 | int err; | |
950 | ||
951 | if (fc->no_access) | |
952 | return 0; | |
953 | ||
ce1d5a49 MS |
954 | req = fuse_get_req(fc); |
955 | if (IS_ERR(req)) | |
956 | return PTR_ERR(req); | |
31d40d74 MS |
957 | |
958 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 959 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
960 | req->in.h.opcode = FUSE_ACCESS; |
961 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
962 | req->in.numargs = 1; |
963 | req->in.args[0].size = sizeof(inarg); | |
964 | req->in.args[0].value = &inarg; | |
b93f858a | 965 | fuse_request_send(fc, req); |
31d40d74 MS |
966 | err = req->out.h.error; |
967 | fuse_put_request(fc, req); | |
968 | if (err == -ENOSYS) { | |
969 | fc->no_access = 1; | |
970 | err = 0; | |
971 | } | |
972 | return err; | |
973 | } | |
974 | ||
19690ddb MS |
975 | static int fuse_perm_getattr(struct inode *inode, int flags) |
976 | { | |
977 | if (flags & IPERM_FLAG_RCU) | |
978 | return -ECHILD; | |
979 | ||
980 | return fuse_do_getattr(inode, NULL, NULL); | |
981 | } | |
982 | ||
6f9f1180 MS |
983 | /* |
984 | * Check permission. The two basic access models of FUSE are: | |
985 | * | |
986 | * 1) Local access checking ('default_permissions' mount option) based | |
987 | * on file mode. This is the plain old disk filesystem permission | |
988 | * modell. | |
989 | * | |
990 | * 2) "Remote" access checking, where server is responsible for | |
991 | * checking permission in each inode operation. An exception to this | |
992 | * is if ->permission() was invoked from sys_access() in which case an | |
993 | * access request is sent. Execute permission is still checked | |
994 | * locally based on file mode. | |
995 | */ | |
b74c79e9 | 996 | static int fuse_permission(struct inode *inode, int mask, unsigned int flags) |
e5e5558e MS |
997 | { |
998 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
999 | bool refreshed = false; |
1000 | int err = 0; | |
e5e5558e | 1001 | |
87729a55 | 1002 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 1003 | return -EACCES; |
244f6385 MS |
1004 | |
1005 | /* | |
e8e96157 | 1006 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1007 | */ |
e8e96157 MS |
1008 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1009 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
19690ddb MS |
1010 | struct fuse_inode *fi = get_fuse_inode(inode); |
1011 | ||
1012 | if (fi->i_time < get_jiffies_64()) { | |
1013 | refreshed = true; | |
1014 | ||
1015 | err = fuse_perm_getattr(inode, flags); | |
1016 | if (err) | |
1017 | return err; | |
1018 | } | |
244f6385 MS |
1019 | } |
1020 | ||
1021 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
b74c79e9 | 1022 | err = generic_permission(inode, mask, flags, NULL); |
1e9a4ed9 MS |
1023 | |
1024 | /* If permission is denied, try to refresh file | |
1025 | attributes. This is also needed, because the root | |
1026 | node will at first have no permissions */ | |
244f6385 | 1027 | if (err == -EACCES && !refreshed) { |
19690ddb | 1028 | err = fuse_perm_getattr(inode, flags); |
1e9a4ed9 | 1029 | if (!err) |
b74c79e9 NP |
1030 | err = generic_permission(inode, mask, |
1031 | flags, NULL); | |
1e9a4ed9 MS |
1032 | } |
1033 | ||
6f9f1180 MS |
1034 | /* Note: the opposite of the above test does not |
1035 | exist. So if permissions are revoked this won't be | |
1036 | noticed immediately, only after the attribute | |
1037 | timeout has expired */ | |
9cfcac81 | 1038 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
19690ddb MS |
1039 | if (flags & IPERM_FLAG_RCU) |
1040 | return -ECHILD; | |
1041 | ||
e8e96157 MS |
1042 | err = fuse_access(inode, mask); |
1043 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1044 | if (!(inode->i_mode & S_IXUGO)) { | |
1045 | if (refreshed) | |
1046 | return -EACCES; | |
1047 | ||
19690ddb | 1048 | err = fuse_perm_getattr(inode, flags); |
e8e96157 MS |
1049 | if (!err && !(inode->i_mode & S_IXUGO)) |
1050 | return -EACCES; | |
1051 | } | |
e5e5558e | 1052 | } |
244f6385 | 1053 | return err; |
e5e5558e MS |
1054 | } |
1055 | ||
1056 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
1057 | void *dstbuf, filldir_t filldir) | |
1058 | { | |
1059 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1060 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1061 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
1062 | int over; | |
1063 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1064 | return -EIO; | |
1065 | if (reclen > nbytes) | |
1066 | break; | |
1067 | ||
1068 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
1069 | file->f_pos, dirent->ino, dirent->type); | |
1070 | if (over) | |
1071 | break; | |
1072 | ||
1073 | buf += reclen; | |
1074 | nbytes -= reclen; | |
1075 | file->f_pos = dirent->off; | |
1076 | } | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
04730fef | 1081 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 1082 | { |
04730fef MS |
1083 | int err; |
1084 | size_t nbytes; | |
1085 | struct page *page; | |
7706a9d6 | 1086 | struct inode *inode = file->f_path.dentry->d_inode; |
e5e5558e | 1087 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 MS |
1088 | struct fuse_req *req; |
1089 | ||
1090 | if (is_bad_inode(inode)) | |
1091 | return -EIO; | |
1092 | ||
ce1d5a49 MS |
1093 | req = fuse_get_req(fc); |
1094 | if (IS_ERR(req)) | |
1095 | return PTR_ERR(req); | |
e5e5558e | 1096 | |
04730fef MS |
1097 | page = alloc_page(GFP_KERNEL); |
1098 | if (!page) { | |
1099 | fuse_put_request(fc, req); | |
1100 | return -ENOMEM; | |
1101 | } | |
f4975c67 | 1102 | req->out.argpages = 1; |
04730fef MS |
1103 | req->num_pages = 1; |
1104 | req->pages[0] = page; | |
2106cb18 | 1105 | fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
b93f858a | 1106 | fuse_request_send(fc, req); |
361b1eb5 | 1107 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1108 | err = req->out.h.error; |
1109 | fuse_put_request(fc, req); | |
1110 | if (!err) | |
04730fef MS |
1111 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
1112 | filldir); | |
e5e5558e | 1113 | |
04730fef | 1114 | __free_page(page); |
b36c31ba | 1115 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 1116 | return err; |
e5e5558e MS |
1117 | } |
1118 | ||
1119 | static char *read_link(struct dentry *dentry) | |
1120 | { | |
1121 | struct inode *inode = dentry->d_inode; | |
1122 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 1123 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
1124 | char *link; |
1125 | ||
ce1d5a49 | 1126 | if (IS_ERR(req)) |
e231c2ee | 1127 | return ERR_CAST(req); |
e5e5558e MS |
1128 | |
1129 | link = (char *) __get_free_page(GFP_KERNEL); | |
1130 | if (!link) { | |
1131 | link = ERR_PTR(-ENOMEM); | |
1132 | goto out; | |
1133 | } | |
1134 | req->in.h.opcode = FUSE_READLINK; | |
1135 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1136 | req->out.argvar = 1; |
1137 | req->out.numargs = 1; | |
1138 | req->out.args[0].size = PAGE_SIZE - 1; | |
1139 | req->out.args[0].value = link; | |
b93f858a | 1140 | fuse_request_send(fc, req); |
e5e5558e MS |
1141 | if (req->out.h.error) { |
1142 | free_page((unsigned long) link); | |
1143 | link = ERR_PTR(req->out.h.error); | |
1144 | } else | |
1145 | link[req->out.args[0].size] = '\0'; | |
1146 | out: | |
1147 | fuse_put_request(fc, req); | |
b36c31ba | 1148 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
1149 | return link; |
1150 | } | |
1151 | ||
1152 | static void free_link(char *link) | |
1153 | { | |
1154 | if (!IS_ERR(link)) | |
1155 | free_page((unsigned long) link); | |
1156 | } | |
1157 | ||
1158 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1159 | { | |
1160 | nd_set_link(nd, read_link(dentry)); | |
1161 | return NULL; | |
1162 | } | |
1163 | ||
1164 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1165 | { | |
1166 | free_link(nd_get_link(nd)); | |
1167 | } | |
1168 | ||
1169 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1170 | { | |
91fe96b4 | 1171 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1172 | } |
1173 | ||
1174 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1175 | { | |
8b0797a4 MS |
1176 | fuse_release_common(file, FUSE_RELEASEDIR); |
1177 | ||
1178 | return 0; | |
e5e5558e MS |
1179 | } |
1180 | ||
7ea80859 | 1181 | static int fuse_dir_fsync(struct file *file, int datasync) |
82547981 | 1182 | { |
7ea80859 | 1183 | return fuse_fsync_common(file, datasync, 1); |
82547981 MS |
1184 | } |
1185 | ||
17637cba MS |
1186 | static bool update_mtime(unsigned ivalid) |
1187 | { | |
1188 | /* Always update if mtime is explicitly set */ | |
1189 | if (ivalid & ATTR_MTIME_SET) | |
1190 | return true; | |
1191 | ||
1192 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ | |
1193 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1194 | return false; | |
1195 | ||
1196 | /* In all other cases update */ | |
1197 | return true; | |
1198 | } | |
1199 | ||
befc649c | 1200 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
1201 | { |
1202 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1203 | |
1204 | if (ivalid & ATTR_MODE) | |
befc649c | 1205 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1206 | if (ivalid & ATTR_UID) |
befc649c | 1207 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 1208 | if (ivalid & ATTR_GID) |
befc649c | 1209 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 1210 | if (ivalid & ATTR_SIZE) |
befc649c | 1211 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1212 | if (ivalid & ATTR_ATIME) { |
1213 | arg->valid |= FATTR_ATIME; | |
befc649c | 1214 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1215 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1216 | if (!(ivalid & ATTR_ATIME_SET)) | |
1217 | arg->valid |= FATTR_ATIME_NOW; | |
1218 | } | |
1219 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) { | |
1220 | arg->valid |= FATTR_MTIME; | |
befc649c | 1221 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba MS |
1222 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
1223 | if (!(ivalid & ATTR_MTIME_SET)) | |
1224 | arg->valid |= FATTR_MTIME_NOW; | |
befc649c | 1225 | } |
9e6268db MS |
1226 | } |
1227 | ||
3be5a52b MS |
1228 | /* |
1229 | * Prevent concurrent writepages on inode | |
1230 | * | |
1231 | * This is done by adding a negative bias to the inode write counter | |
1232 | * and waiting for all pending writes to finish. | |
1233 | */ | |
1234 | void fuse_set_nowrite(struct inode *inode) | |
1235 | { | |
1236 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1237 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1238 | ||
1239 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1240 | ||
1241 | spin_lock(&fc->lock); | |
1242 | BUG_ON(fi->writectr < 0); | |
1243 | fi->writectr += FUSE_NOWRITE; | |
1244 | spin_unlock(&fc->lock); | |
1245 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * Allow writepages on inode | |
1250 | * | |
1251 | * Remove the bias from the writecounter and send any queued | |
1252 | * writepages. | |
1253 | */ | |
1254 | static void __fuse_release_nowrite(struct inode *inode) | |
1255 | { | |
1256 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1257 | ||
1258 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1259 | fi->writectr = 0; | |
1260 | fuse_flush_writepages(inode); | |
1261 | } | |
1262 | ||
1263 | void fuse_release_nowrite(struct inode *inode) | |
1264 | { | |
1265 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1266 | ||
1267 | spin_lock(&fc->lock); | |
1268 | __fuse_release_nowrite(inode); | |
1269 | spin_unlock(&fc->lock); | |
1270 | } | |
1271 | ||
6f9f1180 MS |
1272 | /* |
1273 | * Set attributes, and at the same time refresh them. | |
1274 | * | |
1275 | * Truncation is slightly complicated, because the 'truncate' request | |
1276 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1277 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1278 | * and the actual truncation by hand. | |
6f9f1180 | 1279 | */ |
49d4914f MS |
1280 | static int fuse_do_setattr(struct dentry *entry, struct iattr *attr, |
1281 | struct file *file) | |
9e6268db MS |
1282 | { |
1283 | struct inode *inode = entry->d_inode; | |
1284 | struct fuse_conn *fc = get_fuse_conn(inode); | |
9e6268db MS |
1285 | struct fuse_req *req; |
1286 | struct fuse_setattr_in inarg; | |
1287 | struct fuse_attr_out outarg; | |
3be5a52b MS |
1288 | bool is_truncate = false; |
1289 | loff_t oldsize; | |
9e6268db | 1290 | int err; |
9e6268db | 1291 | |
e57ac683 MS |
1292 | if (!fuse_allow_task(fc, current)) |
1293 | return -EACCES; | |
1294 | ||
db78b877 CH |
1295 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1296 | attr->ia_valid |= ATTR_FORCE; | |
1297 | ||
1298 | err = inode_change_ok(inode, attr); | |
1299 | if (err) | |
1300 | return err; | |
1e9a4ed9 | 1301 | |
8d56addd MS |
1302 | if (attr->ia_valid & ATTR_OPEN) { |
1303 | if (fc->atomic_o_trunc) | |
1304 | return 0; | |
1305 | file = NULL; | |
1306 | } | |
6ff958ed | 1307 | |
2c27c65e | 1308 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1309 | is_truncate = true; |
9e6268db | 1310 | |
ce1d5a49 MS |
1311 | req = fuse_get_req(fc); |
1312 | if (IS_ERR(req)) | |
1313 | return PTR_ERR(req); | |
9e6268db | 1314 | |
3be5a52b MS |
1315 | if (is_truncate) |
1316 | fuse_set_nowrite(inode); | |
1317 | ||
9e6268db | 1318 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1319 | memset(&outarg, 0, sizeof(outarg)); |
befc649c | 1320 | iattr_to_fattr(attr, &inarg); |
49d4914f MS |
1321 | if (file) { |
1322 | struct fuse_file *ff = file->private_data; | |
1323 | inarg.valid |= FATTR_FH; | |
1324 | inarg.fh = ff->fh; | |
1325 | } | |
f3332114 MS |
1326 | if (attr->ia_valid & ATTR_SIZE) { |
1327 | /* For mandatory locking in truncate */ | |
1328 | inarg.valid |= FATTR_LOCKOWNER; | |
1329 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1330 | } | |
9e6268db MS |
1331 | req->in.h.opcode = FUSE_SETATTR; |
1332 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1333 | req->in.numargs = 1; |
1334 | req->in.args[0].size = sizeof(inarg); | |
1335 | req->in.args[0].value = &inarg; | |
1336 | req->out.numargs = 1; | |
0e9663ee MS |
1337 | if (fc->minor < 9) |
1338 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1339 | else | |
1340 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 1341 | req->out.args[0].value = &outarg; |
b93f858a | 1342 | fuse_request_send(fc, req); |
9e6268db MS |
1343 | err = req->out.h.error; |
1344 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1345 | if (err) { |
1346 | if (err == -EINTR) | |
1347 | fuse_invalidate_attr(inode); | |
3be5a52b | 1348 | goto error; |
e00d2c2d | 1349 | } |
9e6268db | 1350 | |
e00d2c2d MS |
1351 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1352 | make_bad_inode(inode); | |
3be5a52b MS |
1353 | err = -EIO; |
1354 | goto error; | |
1355 | } | |
1356 | ||
1357 | spin_lock(&fc->lock); | |
1358 | fuse_change_attributes_common(inode, &outarg.attr, | |
1359 | attr_timeout(&outarg)); | |
1360 | oldsize = inode->i_size; | |
1361 | i_size_write(inode, outarg.attr.size); | |
1362 | ||
1363 | if (is_truncate) { | |
1364 | /* NOTE: this may release/reacquire fc->lock */ | |
1365 | __fuse_release_nowrite(inode); | |
1366 | } | |
1367 | spin_unlock(&fc->lock); | |
1368 | ||
1369 | /* | |
1370 | * Only call invalidate_inode_pages2() after removing | |
1371 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1372 | */ | |
1373 | if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
c08d3b0e | 1374 | truncate_pagecache(inode, oldsize, outarg.attr.size); |
3be5a52b | 1375 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1376 | } |
1377 | ||
e00d2c2d | 1378 | return 0; |
3be5a52b MS |
1379 | |
1380 | error: | |
1381 | if (is_truncate) | |
1382 | fuse_release_nowrite(inode); | |
1383 | ||
1384 | return err; | |
9e6268db MS |
1385 | } |
1386 | ||
49d4914f MS |
1387 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1388 | { | |
1389 | if (attr->ia_valid & ATTR_FILE) | |
1390 | return fuse_do_setattr(entry, attr, attr->ia_file); | |
1391 | else | |
1392 | return fuse_do_setattr(entry, attr, NULL); | |
1393 | } | |
1394 | ||
e5e5558e MS |
1395 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1396 | struct kstat *stat) | |
1397 | { | |
1398 | struct inode *inode = entry->d_inode; | |
244f6385 | 1399 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 MS |
1400 | |
1401 | if (!fuse_allow_task(fc, current)) | |
1402 | return -EACCES; | |
1403 | ||
bcb4be80 | 1404 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1405 | } |
1406 | ||
92a8780e MS |
1407 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1408 | const void *value, size_t size, int flags) | |
1409 | { | |
1410 | struct inode *inode = entry->d_inode; | |
1411 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1412 | struct fuse_req *req; | |
1413 | struct fuse_setxattr_in inarg; | |
1414 | int err; | |
1415 | ||
92a8780e MS |
1416 | if (fc->no_setxattr) |
1417 | return -EOPNOTSUPP; | |
1418 | ||
ce1d5a49 MS |
1419 | req = fuse_get_req(fc); |
1420 | if (IS_ERR(req)) | |
1421 | return PTR_ERR(req); | |
92a8780e MS |
1422 | |
1423 | memset(&inarg, 0, sizeof(inarg)); | |
1424 | inarg.size = size; | |
1425 | inarg.flags = flags; | |
1426 | req->in.h.opcode = FUSE_SETXATTR; | |
1427 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1428 | req->in.numargs = 3; |
1429 | req->in.args[0].size = sizeof(inarg); | |
1430 | req->in.args[0].value = &inarg; | |
1431 | req->in.args[1].size = strlen(name) + 1; | |
1432 | req->in.args[1].value = name; | |
1433 | req->in.args[2].size = size; | |
1434 | req->in.args[2].value = value; | |
b93f858a | 1435 | fuse_request_send(fc, req); |
92a8780e MS |
1436 | err = req->out.h.error; |
1437 | fuse_put_request(fc, req); | |
1438 | if (err == -ENOSYS) { | |
1439 | fc->no_setxattr = 1; | |
1440 | err = -EOPNOTSUPP; | |
1441 | } | |
1442 | return err; | |
1443 | } | |
1444 | ||
1445 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1446 | void *value, size_t size) | |
1447 | { | |
1448 | struct inode *inode = entry->d_inode; | |
1449 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1450 | struct fuse_req *req; | |
1451 | struct fuse_getxattr_in inarg; | |
1452 | struct fuse_getxattr_out outarg; | |
1453 | ssize_t ret; | |
1454 | ||
1455 | if (fc->no_getxattr) | |
1456 | return -EOPNOTSUPP; | |
1457 | ||
ce1d5a49 MS |
1458 | req = fuse_get_req(fc); |
1459 | if (IS_ERR(req)) | |
1460 | return PTR_ERR(req); | |
92a8780e MS |
1461 | |
1462 | memset(&inarg, 0, sizeof(inarg)); | |
1463 | inarg.size = size; | |
1464 | req->in.h.opcode = FUSE_GETXATTR; | |
1465 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1466 | req->in.numargs = 2; |
1467 | req->in.args[0].size = sizeof(inarg); | |
1468 | req->in.args[0].value = &inarg; | |
1469 | req->in.args[1].size = strlen(name) + 1; | |
1470 | req->in.args[1].value = name; | |
1471 | /* This is really two different operations rolled into one */ | |
1472 | req->out.numargs = 1; | |
1473 | if (size) { | |
1474 | req->out.argvar = 1; | |
1475 | req->out.args[0].size = size; | |
1476 | req->out.args[0].value = value; | |
1477 | } else { | |
1478 | req->out.args[0].size = sizeof(outarg); | |
1479 | req->out.args[0].value = &outarg; | |
1480 | } | |
b93f858a | 1481 | fuse_request_send(fc, req); |
92a8780e MS |
1482 | ret = req->out.h.error; |
1483 | if (!ret) | |
1484 | ret = size ? req->out.args[0].size : outarg.size; | |
1485 | else { | |
1486 | if (ret == -ENOSYS) { | |
1487 | fc->no_getxattr = 1; | |
1488 | ret = -EOPNOTSUPP; | |
1489 | } | |
1490 | } | |
1491 | fuse_put_request(fc, req); | |
1492 | return ret; | |
1493 | } | |
1494 | ||
1495 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1496 | { | |
1497 | struct inode *inode = entry->d_inode; | |
1498 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1499 | struct fuse_req *req; | |
1500 | struct fuse_getxattr_in inarg; | |
1501 | struct fuse_getxattr_out outarg; | |
1502 | ssize_t ret; | |
1503 | ||
e57ac683 MS |
1504 | if (!fuse_allow_task(fc, current)) |
1505 | return -EACCES; | |
1506 | ||
92a8780e MS |
1507 | if (fc->no_listxattr) |
1508 | return -EOPNOTSUPP; | |
1509 | ||
ce1d5a49 MS |
1510 | req = fuse_get_req(fc); |
1511 | if (IS_ERR(req)) | |
1512 | return PTR_ERR(req); | |
92a8780e MS |
1513 | |
1514 | memset(&inarg, 0, sizeof(inarg)); | |
1515 | inarg.size = size; | |
1516 | req->in.h.opcode = FUSE_LISTXATTR; | |
1517 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1518 | req->in.numargs = 1; |
1519 | req->in.args[0].size = sizeof(inarg); | |
1520 | req->in.args[0].value = &inarg; | |
1521 | /* This is really two different operations rolled into one */ | |
1522 | req->out.numargs = 1; | |
1523 | if (size) { | |
1524 | req->out.argvar = 1; | |
1525 | req->out.args[0].size = size; | |
1526 | req->out.args[0].value = list; | |
1527 | } else { | |
1528 | req->out.args[0].size = sizeof(outarg); | |
1529 | req->out.args[0].value = &outarg; | |
1530 | } | |
b93f858a | 1531 | fuse_request_send(fc, req); |
92a8780e MS |
1532 | ret = req->out.h.error; |
1533 | if (!ret) | |
1534 | ret = size ? req->out.args[0].size : outarg.size; | |
1535 | else { | |
1536 | if (ret == -ENOSYS) { | |
1537 | fc->no_listxattr = 1; | |
1538 | ret = -EOPNOTSUPP; | |
1539 | } | |
1540 | } | |
1541 | fuse_put_request(fc, req); | |
1542 | return ret; | |
1543 | } | |
1544 | ||
1545 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1546 | { | |
1547 | struct inode *inode = entry->d_inode; | |
1548 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1549 | struct fuse_req *req; | |
1550 | int err; | |
1551 | ||
1552 | if (fc->no_removexattr) | |
1553 | return -EOPNOTSUPP; | |
1554 | ||
ce1d5a49 MS |
1555 | req = fuse_get_req(fc); |
1556 | if (IS_ERR(req)) | |
1557 | return PTR_ERR(req); | |
92a8780e MS |
1558 | |
1559 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1560 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1561 | req->in.numargs = 1; |
1562 | req->in.args[0].size = strlen(name) + 1; | |
1563 | req->in.args[0].value = name; | |
b93f858a | 1564 | fuse_request_send(fc, req); |
92a8780e MS |
1565 | err = req->out.h.error; |
1566 | fuse_put_request(fc, req); | |
1567 | if (err == -ENOSYS) { | |
1568 | fc->no_removexattr = 1; | |
1569 | err = -EOPNOTSUPP; | |
1570 | } | |
1571 | return err; | |
1572 | } | |
1573 | ||
754661f1 | 1574 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1575 | .lookup = fuse_lookup, |
9e6268db MS |
1576 | .mkdir = fuse_mkdir, |
1577 | .symlink = fuse_symlink, | |
1578 | .unlink = fuse_unlink, | |
1579 | .rmdir = fuse_rmdir, | |
1580 | .rename = fuse_rename, | |
1581 | .link = fuse_link, | |
1582 | .setattr = fuse_setattr, | |
1583 | .create = fuse_create, | |
1584 | .mknod = fuse_mknod, | |
e5e5558e MS |
1585 | .permission = fuse_permission, |
1586 | .getattr = fuse_getattr, | |
92a8780e MS |
1587 | .setxattr = fuse_setxattr, |
1588 | .getxattr = fuse_getxattr, | |
1589 | .listxattr = fuse_listxattr, | |
1590 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1591 | }; |
1592 | ||
4b6f5d20 | 1593 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1594 | .llseek = generic_file_llseek, |
e5e5558e MS |
1595 | .read = generic_read_dir, |
1596 | .readdir = fuse_readdir, | |
1597 | .open = fuse_dir_open, | |
1598 | .release = fuse_dir_release, | |
82547981 | 1599 | .fsync = fuse_dir_fsync, |
e5e5558e MS |
1600 | }; |
1601 | ||
754661f1 | 1602 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1603 | .setattr = fuse_setattr, |
e5e5558e MS |
1604 | .permission = fuse_permission, |
1605 | .getattr = fuse_getattr, | |
92a8780e MS |
1606 | .setxattr = fuse_setxattr, |
1607 | .getxattr = fuse_getxattr, | |
1608 | .listxattr = fuse_listxattr, | |
1609 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1610 | }; |
1611 | ||
754661f1 | 1612 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1613 | .setattr = fuse_setattr, |
e5e5558e MS |
1614 | .follow_link = fuse_follow_link, |
1615 | .put_link = fuse_put_link, | |
1616 | .readlink = generic_readlink, | |
1617 | .getattr = fuse_getattr, | |
92a8780e MS |
1618 | .setxattr = fuse_setxattr, |
1619 | .getxattr = fuse_getxattr, | |
1620 | .listxattr = fuse_listxattr, | |
1621 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1622 | }; |
1623 | ||
1624 | void fuse_init_common(struct inode *inode) | |
1625 | { | |
1626 | inode->i_op = &fuse_common_inode_operations; | |
1627 | } | |
1628 | ||
1629 | void fuse_init_dir(struct inode *inode) | |
1630 | { | |
1631 | inode->i_op = &fuse_dir_inode_operations; | |
1632 | inode->i_fop = &fuse_dir_operations; | |
1633 | } | |
1634 | ||
1635 | void fuse_init_symlink(struct inode *inode) | |
1636 | { | |
1637 | inode->i_op = &fuse_symlink_inode_operations; | |
1638 | } |