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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 | ||
d2433905 | 177 | if (nd && (nd->flags & LOOKUP_RCU)) |
e7c0a167 MS |
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 | */ | |
541af6a0 AV |
372 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
373 | umode_t mode, struct nameidata *nd) | |
fd72faac MS |
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; | |
8a5e929d | 385 | int flags = nd->intent.open.flags; |
fd72faac | 386 | |
fd72faac | 387 | if (fc->no_create) |
ce1d5a49 | 388 | return -ENOSYS; |
fd72faac | 389 | |
07e77dca MS |
390 | forget = fuse_alloc_forget(); |
391 | if (!forget) | |
392 | return -ENOMEM; | |
51eb01e7 | 393 | |
ce1d5a49 | 394 | req = fuse_get_req(fc); |
51eb01e7 | 395 | err = PTR_ERR(req); |
ce1d5a49 | 396 | if (IS_ERR(req)) |
51eb01e7 | 397 | goto out_put_forget_req; |
fd72faac | 398 | |
ce1d5a49 | 399 | err = -ENOMEM; |
acf99433 | 400 | ff = fuse_file_alloc(fc); |
fd72faac MS |
401 | if (!ff) |
402 | goto out_put_request; | |
403 | ||
e0a43ddc MS |
404 | if (!fc->dont_mask) |
405 | mode &= ~current_umask(); | |
406 | ||
fd72faac MS |
407 | flags &= ~O_NOCTTY; |
408 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 409 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
410 | inarg.flags = flags; |
411 | inarg.mode = mode; | |
e0a43ddc | 412 | inarg.umask = current_umask(); |
fd72faac MS |
413 | req->in.h.opcode = FUSE_CREATE; |
414 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac | 415 | req->in.numargs = 2; |
e0a43ddc MS |
416 | req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : |
417 | sizeof(inarg); | |
fd72faac MS |
418 | req->in.args[0].value = &inarg; |
419 | req->in.args[1].size = entry->d_name.len + 1; | |
420 | req->in.args[1].value = entry->d_name.name; | |
421 | req->out.numargs = 2; | |
0e9663ee MS |
422 | if (fc->minor < 9) |
423 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
424 | else | |
425 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
426 | req->out.args[0].value = &outentry; |
427 | req->out.args[1].size = sizeof(outopen); | |
428 | req->out.args[1].value = &outopen; | |
b93f858a | 429 | fuse_request_send(fc, req); |
fd72faac MS |
430 | err = req->out.h.error; |
431 | if (err) { | |
432 | if (err == -ENOSYS) | |
433 | fc->no_create = 1; | |
434 | goto out_free_ff; | |
435 | } | |
436 | ||
437 | err = -EIO; | |
2827d0b2 | 438 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
439 | goto out_free_ff; |
440 | ||
51eb01e7 | 441 | fuse_put_request(fc, req); |
c7b7143c MS |
442 | ff->fh = outopen.fh; |
443 | ff->nodeid = outentry.nodeid; | |
444 | ff->open_flags = outopen.open_flags; | |
fd72faac | 445 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 446 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
447 | if (!inode) { |
448 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 449 | fuse_sync_release(ff, flags); |
07e77dca | 450 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
51eb01e7 | 451 | return -ENOMEM; |
fd72faac | 452 | } |
07e77dca | 453 | kfree(forget); |
fd72faac | 454 | d_instantiate(entry, inode); |
1fb69e78 | 455 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 456 | fuse_invalidate_attr(dir); |
fd72faac MS |
457 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
458 | if (IS_ERR(file)) { | |
8b0797a4 | 459 | fuse_sync_release(ff, flags); |
fd72faac MS |
460 | return PTR_ERR(file); |
461 | } | |
c7b7143c MS |
462 | file->private_data = fuse_file_get(ff); |
463 | fuse_finish_open(inode, file); | |
fd72faac MS |
464 | return 0; |
465 | ||
466 | out_free_ff: | |
467 | fuse_file_free(ff); | |
468 | out_put_request: | |
469 | fuse_put_request(fc, req); | |
51eb01e7 | 470 | out_put_forget_req: |
07e77dca | 471 | kfree(forget); |
fd72faac MS |
472 | return err; |
473 | } | |
474 | ||
6f9f1180 MS |
475 | /* |
476 | * Code shared between mknod, mkdir, symlink and link | |
477 | */ | |
9e6268db MS |
478 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
479 | struct inode *dir, struct dentry *entry, | |
541af6a0 | 480 | umode_t mode) |
9e6268db MS |
481 | { |
482 | struct fuse_entry_out outarg; | |
483 | struct inode *inode; | |
9e6268db | 484 | int err; |
07e77dca | 485 | struct fuse_forget_link *forget; |
2d51013e | 486 | |
07e77dca MS |
487 | forget = fuse_alloc_forget(); |
488 | if (!forget) { | |
2d51013e | 489 | fuse_put_request(fc, req); |
07e77dca | 490 | return -ENOMEM; |
2d51013e | 491 | } |
9e6268db | 492 | |
0e9663ee | 493 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 494 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 495 | req->out.numargs = 1; |
0e9663ee MS |
496 | if (fc->minor < 9) |
497 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
498 | else | |
499 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 500 | req->out.args[0].value = &outarg; |
b93f858a | 501 | fuse_request_send(fc, req); |
9e6268db | 502 | err = req->out.h.error; |
2d51013e MS |
503 | fuse_put_request(fc, req); |
504 | if (err) | |
505 | goto out_put_forget_req; | |
506 | ||
39ee059a MS |
507 | err = -EIO; |
508 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 509 | goto out_put_forget_req; |
39ee059a MS |
510 | |
511 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 512 | goto out_put_forget_req; |
39ee059a | 513 | |
9e6268db | 514 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 515 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 516 | if (!inode) { |
07e77dca | 517 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
518 | return -ENOMEM; |
519 | } | |
07e77dca | 520 | kfree(forget); |
9e6268db | 521 | |
d2a85164 MS |
522 | if (S_ISDIR(inode->i_mode)) { |
523 | struct dentry *alias; | |
524 | mutex_lock(&fc->inst_mutex); | |
525 | alias = d_find_alias(inode); | |
526 | if (alias) { | |
527 | /* New directory must have moved since mkdir */ | |
528 | mutex_unlock(&fc->inst_mutex); | |
529 | dput(alias); | |
530 | iput(inode); | |
531 | return -EBUSY; | |
532 | } | |
533 | d_instantiate(entry, inode); | |
534 | mutex_unlock(&fc->inst_mutex); | |
535 | } else | |
536 | d_instantiate(entry, inode); | |
9e6268db | 537 | |
1fb69e78 | 538 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
539 | fuse_invalidate_attr(dir); |
540 | return 0; | |
39ee059a | 541 | |
2d51013e | 542 | out_put_forget_req: |
07e77dca | 543 | kfree(forget); |
39ee059a | 544 | return err; |
9e6268db MS |
545 | } |
546 | ||
1a67aafb | 547 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
548 | dev_t rdev) |
549 | { | |
550 | struct fuse_mknod_in inarg; | |
551 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
552 | struct fuse_req *req = fuse_get_req(fc); |
553 | if (IS_ERR(req)) | |
554 | return PTR_ERR(req); | |
9e6268db | 555 | |
e0a43ddc MS |
556 | if (!fc->dont_mask) |
557 | mode &= ~current_umask(); | |
558 | ||
9e6268db MS |
559 | memset(&inarg, 0, sizeof(inarg)); |
560 | inarg.mode = mode; | |
561 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 562 | inarg.umask = current_umask(); |
9e6268db MS |
563 | req->in.h.opcode = FUSE_MKNOD; |
564 | req->in.numargs = 2; | |
e0a43ddc MS |
565 | req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : |
566 | sizeof(inarg); | |
9e6268db MS |
567 | req->in.args[0].value = &inarg; |
568 | req->in.args[1].size = entry->d_name.len + 1; | |
569 | req->in.args[1].value = entry->d_name.name; | |
570 | return create_new_entry(fc, req, dir, entry, mode); | |
571 | } | |
572 | ||
4acdaf27 | 573 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
574 | struct nameidata *nd) |
575 | { | |
dd7dd556 | 576 | if (nd) { |
fd72faac MS |
577 | int err = fuse_create_open(dir, entry, mode, nd); |
578 | if (err != -ENOSYS) | |
579 | return err; | |
580 | /* Fall back on mknod */ | |
581 | } | |
9e6268db MS |
582 | return fuse_mknod(dir, entry, mode, 0); |
583 | } | |
584 | ||
18bb1db3 | 585 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
586 | { |
587 | struct fuse_mkdir_in inarg; | |
588 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
589 | struct fuse_req *req = fuse_get_req(fc); |
590 | if (IS_ERR(req)) | |
591 | return PTR_ERR(req); | |
9e6268db | 592 | |
e0a43ddc MS |
593 | if (!fc->dont_mask) |
594 | mode &= ~current_umask(); | |
595 | ||
9e6268db MS |
596 | memset(&inarg, 0, sizeof(inarg)); |
597 | inarg.mode = mode; | |
e0a43ddc | 598 | inarg.umask = current_umask(); |
9e6268db MS |
599 | req->in.h.opcode = FUSE_MKDIR; |
600 | req->in.numargs = 2; | |
601 | req->in.args[0].size = sizeof(inarg); | |
602 | req->in.args[0].value = &inarg; | |
603 | req->in.args[1].size = entry->d_name.len + 1; | |
604 | req->in.args[1].value = entry->d_name.name; | |
605 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
606 | } | |
607 | ||
608 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
609 | const char *link) | |
610 | { | |
611 | struct fuse_conn *fc = get_fuse_conn(dir); | |
612 | unsigned len = strlen(link) + 1; | |
ce1d5a49 MS |
613 | struct fuse_req *req = fuse_get_req(fc); |
614 | if (IS_ERR(req)) | |
615 | return PTR_ERR(req); | |
9e6268db MS |
616 | |
617 | req->in.h.opcode = FUSE_SYMLINK; | |
618 | req->in.numargs = 2; | |
619 | req->in.args[0].size = entry->d_name.len + 1; | |
620 | req->in.args[0].value = entry->d_name.name; | |
621 | req->in.args[1].size = len; | |
622 | req->in.args[1].value = link; | |
623 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
624 | } | |
625 | ||
626 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
627 | { | |
628 | int err; | |
629 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
630 | struct fuse_req *req = fuse_get_req(fc); |
631 | if (IS_ERR(req)) | |
632 | return PTR_ERR(req); | |
9e6268db MS |
633 | |
634 | req->in.h.opcode = FUSE_UNLINK; | |
635 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
636 | req->in.numargs = 1; |
637 | req->in.args[0].size = entry->d_name.len + 1; | |
638 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 639 | fuse_request_send(fc, req); |
9e6268db MS |
640 | err = req->out.h.error; |
641 | fuse_put_request(fc, req); | |
642 | if (!err) { | |
643 | struct inode *inode = entry->d_inode; | |
ac45d613 | 644 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 645 | |
ac45d613 MS |
646 | spin_lock(&fc->lock); |
647 | fi->attr_version = ++fc->attr_version; | |
648 | drop_nlink(inode); | |
649 | spin_unlock(&fc->lock); | |
9e6268db MS |
650 | fuse_invalidate_attr(inode); |
651 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 652 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
653 | } else if (err == -EINTR) |
654 | fuse_invalidate_entry(entry); | |
655 | return err; | |
656 | } | |
657 | ||
658 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
659 | { | |
660 | int err; | |
661 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
662 | struct fuse_req *req = fuse_get_req(fc); |
663 | if (IS_ERR(req)) | |
664 | return PTR_ERR(req); | |
9e6268db MS |
665 | |
666 | req->in.h.opcode = FUSE_RMDIR; | |
667 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
668 | req->in.numargs = 1; |
669 | req->in.args[0].size = entry->d_name.len + 1; | |
670 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 671 | fuse_request_send(fc, req); |
9e6268db MS |
672 | err = req->out.h.error; |
673 | fuse_put_request(fc, req); | |
674 | if (!err) { | |
ce71ec36 | 675 | clear_nlink(entry->d_inode); |
9e6268db | 676 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 677 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
678 | } else if (err == -EINTR) |
679 | fuse_invalidate_entry(entry); | |
680 | return err; | |
681 | } | |
682 | ||
683 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
684 | struct inode *newdir, struct dentry *newent) | |
685 | { | |
686 | int err; | |
687 | struct fuse_rename_in inarg; | |
688 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 | 689 | struct fuse_req *req = fuse_get_req(fc); |
e4eaac06 | 690 | |
ce1d5a49 MS |
691 | if (IS_ERR(req)) |
692 | return PTR_ERR(req); | |
9e6268db MS |
693 | |
694 | memset(&inarg, 0, sizeof(inarg)); | |
695 | inarg.newdir = get_node_id(newdir); | |
696 | req->in.h.opcode = FUSE_RENAME; | |
697 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
698 | req->in.numargs = 3; |
699 | req->in.args[0].size = sizeof(inarg); | |
700 | req->in.args[0].value = &inarg; | |
701 | req->in.args[1].size = oldent->d_name.len + 1; | |
702 | req->in.args[1].value = oldent->d_name.name; | |
703 | req->in.args[2].size = newent->d_name.len + 1; | |
704 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 705 | fuse_request_send(fc, req); |
9e6268db MS |
706 | err = req->out.h.error; |
707 | fuse_put_request(fc, req); | |
708 | if (!err) { | |
08b63307 MS |
709 | /* ctime changes */ |
710 | fuse_invalidate_attr(oldent->d_inode); | |
711 | ||
9e6268db MS |
712 | fuse_invalidate_attr(olddir); |
713 | if (olddir != newdir) | |
714 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
715 | |
716 | /* newent will end up negative */ | |
5219f346 MS |
717 | if (newent->d_inode) { |
718 | fuse_invalidate_attr(newent->d_inode); | |
8cbdf1e6 | 719 | fuse_invalidate_entry_cache(newent); |
5219f346 | 720 | } |
9e6268db MS |
721 | } else if (err == -EINTR) { |
722 | /* If request was interrupted, DEITY only knows if the | |
723 | rename actually took place. If the invalidation | |
724 | fails (e.g. some process has CWD under the renamed | |
725 | directory), then there can be inconsistency between | |
726 | the dcache and the real filesystem. Tough luck. */ | |
727 | fuse_invalidate_entry(oldent); | |
728 | if (newent->d_inode) | |
729 | fuse_invalidate_entry(newent); | |
730 | } | |
731 | ||
732 | return err; | |
733 | } | |
734 | ||
735 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
736 | struct dentry *newent) | |
737 | { | |
738 | int err; | |
739 | struct fuse_link_in inarg; | |
740 | struct inode *inode = entry->d_inode; | |
741 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
742 | struct fuse_req *req = fuse_get_req(fc); |
743 | if (IS_ERR(req)) | |
744 | return PTR_ERR(req); | |
9e6268db MS |
745 | |
746 | memset(&inarg, 0, sizeof(inarg)); | |
747 | inarg.oldnodeid = get_node_id(inode); | |
748 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
749 | req->in.numargs = 2; |
750 | req->in.args[0].size = sizeof(inarg); | |
751 | req->in.args[0].value = &inarg; | |
752 | req->in.args[1].size = newent->d_name.len + 1; | |
753 | req->in.args[1].value = newent->d_name.name; | |
754 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
755 | /* Contrary to "normal" filesystems it can happen that link | |
756 | makes two "logical" inodes point to the same "physical" | |
757 | inode. We invalidate the attributes of the old one, so it | |
758 | will reflect changes in the backing inode (link count, | |
759 | etc.) | |
760 | */ | |
ac45d613 MS |
761 | if (!err) { |
762 | struct fuse_inode *fi = get_fuse_inode(inode); | |
763 | ||
764 | spin_lock(&fc->lock); | |
765 | fi->attr_version = ++fc->attr_version; | |
766 | inc_nlink(inode); | |
767 | spin_unlock(&fc->lock); | |
9e6268db | 768 | fuse_invalidate_attr(inode); |
ac45d613 MS |
769 | } else if (err == -EINTR) { |
770 | fuse_invalidate_attr(inode); | |
771 | } | |
9e6268db MS |
772 | return err; |
773 | } | |
774 | ||
1fb69e78 MS |
775 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
776 | struct kstat *stat) | |
777 | { | |
778 | stat->dev = inode->i_sb->s_dev; | |
779 | stat->ino = attr->ino; | |
780 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
781 | stat->nlink = attr->nlink; | |
782 | stat->uid = attr->uid; | |
783 | stat->gid = attr->gid; | |
784 | stat->rdev = inode->i_rdev; | |
785 | stat->atime.tv_sec = attr->atime; | |
786 | stat->atime.tv_nsec = attr->atimensec; | |
787 | stat->mtime.tv_sec = attr->mtime; | |
788 | stat->mtime.tv_nsec = attr->mtimensec; | |
789 | stat->ctime.tv_sec = attr->ctime; | |
790 | stat->ctime.tv_nsec = attr->ctimensec; | |
791 | stat->size = attr->size; | |
792 | stat->blocks = attr->blocks; | |
793 | stat->blksize = (1 << inode->i_blkbits); | |
794 | } | |
795 | ||
c79e322f MS |
796 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
797 | struct file *file) | |
e5e5558e MS |
798 | { |
799 | int err; | |
c79e322f MS |
800 | struct fuse_getattr_in inarg; |
801 | struct fuse_attr_out outarg; | |
e5e5558e | 802 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
803 | struct fuse_req *req; |
804 | u64 attr_version; | |
805 | ||
806 | req = fuse_get_req(fc); | |
ce1d5a49 MS |
807 | if (IS_ERR(req)) |
808 | return PTR_ERR(req); | |
e5e5558e | 809 | |
7dca9fd3 | 810 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 811 | |
c79e322f | 812 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 813 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
814 | /* Directories have separate file-handle space */ |
815 | if (file && S_ISREG(inode->i_mode)) { | |
816 | struct fuse_file *ff = file->private_data; | |
817 | ||
818 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
819 | inarg.fh = ff->fh; | |
820 | } | |
e5e5558e MS |
821 | req->in.h.opcode = FUSE_GETATTR; |
822 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
823 | req->in.numargs = 1; |
824 | req->in.args[0].size = sizeof(inarg); | |
825 | req->in.args[0].value = &inarg; | |
e5e5558e | 826 | req->out.numargs = 1; |
0e9663ee MS |
827 | if (fc->minor < 9) |
828 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
829 | else | |
830 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 831 | req->out.args[0].value = &outarg; |
b93f858a | 832 | fuse_request_send(fc, req); |
e5e5558e MS |
833 | err = req->out.h.error; |
834 | fuse_put_request(fc, req); | |
835 | if (!err) { | |
c79e322f | 836 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
837 | make_bad_inode(inode); |
838 | err = -EIO; | |
839 | } else { | |
c79e322f MS |
840 | fuse_change_attributes(inode, &outarg.attr, |
841 | attr_timeout(&outarg), | |
1fb69e78 MS |
842 | attr_version); |
843 | if (stat) | |
c79e322f | 844 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
845 | } |
846 | } | |
847 | return err; | |
848 | } | |
849 | ||
bcb4be80 MS |
850 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
851 | struct file *file, bool *refreshed) | |
852 | { | |
853 | struct fuse_inode *fi = get_fuse_inode(inode); | |
854 | int err; | |
855 | bool r; | |
856 | ||
857 | if (fi->i_time < get_jiffies_64()) { | |
858 | r = true; | |
859 | err = fuse_do_getattr(inode, stat, file); | |
860 | } else { | |
861 | r = false; | |
862 | err = 0; | |
863 | if (stat) { | |
864 | generic_fillattr(inode, stat); | |
865 | stat->mode = fi->orig_i_mode; | |
866 | } | |
867 | } | |
868 | ||
869 | if (refreshed != NULL) | |
870 | *refreshed = r; | |
871 | ||
872 | return err; | |
873 | } | |
874 | ||
3b463ae0 | 875 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 876 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
877 | { |
878 | int err = -ENOTDIR; | |
879 | struct inode *parent; | |
880 | struct dentry *dir; | |
881 | struct dentry *entry; | |
882 | ||
883 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
884 | if (!parent) | |
885 | return -ENOENT; | |
886 | ||
887 | mutex_lock(&parent->i_mutex); | |
888 | if (!S_ISDIR(parent->i_mode)) | |
889 | goto unlock; | |
890 | ||
891 | err = -ENOENT; | |
892 | dir = d_find_alias(parent); | |
893 | if (!dir) | |
894 | goto unlock; | |
895 | ||
896 | entry = d_lookup(dir, name); | |
897 | dput(dir); | |
898 | if (!entry) | |
899 | goto unlock; | |
900 | ||
901 | fuse_invalidate_attr(parent); | |
902 | fuse_invalidate_entry(entry); | |
451d0f59 JM |
903 | |
904 | if (child_nodeid != 0 && entry->d_inode) { | |
905 | mutex_lock(&entry->d_inode->i_mutex); | |
906 | if (get_node_id(entry->d_inode) != child_nodeid) { | |
907 | err = -ENOENT; | |
908 | goto badentry; | |
909 | } | |
910 | if (d_mountpoint(entry)) { | |
911 | err = -EBUSY; | |
912 | goto badentry; | |
913 | } | |
914 | if (S_ISDIR(entry->d_inode->i_mode)) { | |
915 | shrink_dcache_parent(entry); | |
916 | if (!simple_empty(entry)) { | |
917 | err = -ENOTEMPTY; | |
918 | goto badentry; | |
919 | } | |
920 | entry->d_inode->i_flags |= S_DEAD; | |
921 | } | |
922 | dont_mount(entry); | |
923 | clear_nlink(entry->d_inode); | |
924 | err = 0; | |
925 | badentry: | |
926 | mutex_unlock(&entry->d_inode->i_mutex); | |
927 | if (!err) | |
928 | d_delete(entry); | |
929 | } else { | |
930 | err = 0; | |
931 | } | |
3b463ae0 | 932 | dput(entry); |
3b463ae0 JM |
933 | |
934 | unlock: | |
935 | mutex_unlock(&parent->i_mutex); | |
936 | iput(parent); | |
937 | return err; | |
938 | } | |
939 | ||
87729a55 MS |
940 | /* |
941 | * Calling into a user-controlled filesystem gives the filesystem | |
942 | * daemon ptrace-like capabilities over the requester process. This | |
943 | * means, that the filesystem daemon is able to record the exact | |
944 | * filesystem operations performed, and can also control the behavior | |
945 | * of the requester process in otherwise impossible ways. For example | |
946 | * it can delay the operation for arbitrary length of time allowing | |
947 | * DoS against the requester. | |
948 | * | |
949 | * For this reason only those processes can call into the filesystem, | |
950 | * for which the owner of the mount has ptrace privilege. This | |
951 | * excludes processes started by other users, suid or sgid processes. | |
952 | */ | |
e57ac683 | 953 | int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) |
87729a55 | 954 | { |
c69e8d9c DH |
955 | const struct cred *cred; |
956 | int ret; | |
87729a55 | 957 | |
c69e8d9c | 958 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
959 | return 1; |
960 | ||
c69e8d9c DH |
961 | rcu_read_lock(); |
962 | ret = 0; | |
963 | cred = __task_cred(task); | |
964 | if (cred->euid == fc->user_id && | |
965 | cred->suid == fc->user_id && | |
966 | cred->uid == fc->user_id && | |
967 | cred->egid == fc->group_id && | |
968 | cred->sgid == fc->group_id && | |
969 | cred->gid == fc->group_id) | |
970 | ret = 1; | |
971 | rcu_read_unlock(); | |
972 | ||
973 | return ret; | |
87729a55 MS |
974 | } |
975 | ||
31d40d74 MS |
976 | static int fuse_access(struct inode *inode, int mask) |
977 | { | |
978 | struct fuse_conn *fc = get_fuse_conn(inode); | |
979 | struct fuse_req *req; | |
980 | struct fuse_access_in inarg; | |
981 | int err; | |
982 | ||
983 | if (fc->no_access) | |
984 | return 0; | |
985 | ||
ce1d5a49 MS |
986 | req = fuse_get_req(fc); |
987 | if (IS_ERR(req)) | |
988 | return PTR_ERR(req); | |
31d40d74 MS |
989 | |
990 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 991 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
992 | req->in.h.opcode = FUSE_ACCESS; |
993 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
994 | req->in.numargs = 1; |
995 | req->in.args[0].size = sizeof(inarg); | |
996 | req->in.args[0].value = &inarg; | |
b93f858a | 997 | fuse_request_send(fc, req); |
31d40d74 MS |
998 | err = req->out.h.error; |
999 | fuse_put_request(fc, req); | |
1000 | if (err == -ENOSYS) { | |
1001 | fc->no_access = 1; | |
1002 | err = 0; | |
1003 | } | |
1004 | return err; | |
1005 | } | |
1006 | ||
10556cb2 | 1007 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1008 | { |
10556cb2 | 1009 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1010 | return -ECHILD; |
1011 | ||
1012 | return fuse_do_getattr(inode, NULL, NULL); | |
1013 | } | |
1014 | ||
6f9f1180 MS |
1015 | /* |
1016 | * Check permission. The two basic access models of FUSE are: | |
1017 | * | |
1018 | * 1) Local access checking ('default_permissions' mount option) based | |
1019 | * on file mode. This is the plain old disk filesystem permission | |
1020 | * modell. | |
1021 | * | |
1022 | * 2) "Remote" access checking, where server is responsible for | |
1023 | * checking permission in each inode operation. An exception to this | |
1024 | * is if ->permission() was invoked from sys_access() in which case an | |
1025 | * access request is sent. Execute permission is still checked | |
1026 | * locally based on file mode. | |
1027 | */ | |
10556cb2 | 1028 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1029 | { |
1030 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1031 | bool refreshed = false; |
1032 | int err = 0; | |
e5e5558e | 1033 | |
87729a55 | 1034 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 1035 | return -EACCES; |
244f6385 MS |
1036 | |
1037 | /* | |
e8e96157 | 1038 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1039 | */ |
e8e96157 MS |
1040 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1041 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
19690ddb MS |
1042 | struct fuse_inode *fi = get_fuse_inode(inode); |
1043 | ||
1044 | if (fi->i_time < get_jiffies_64()) { | |
1045 | refreshed = true; | |
1046 | ||
10556cb2 | 1047 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1048 | if (err) |
1049 | return err; | |
1050 | } | |
244f6385 MS |
1051 | } |
1052 | ||
1053 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
2830ba7f | 1054 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1055 | |
1056 | /* If permission is denied, try to refresh file | |
1057 | attributes. This is also needed, because the root | |
1058 | node will at first have no permissions */ | |
244f6385 | 1059 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1060 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1061 | if (!err) |
2830ba7f | 1062 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1063 | } |
1064 | ||
6f9f1180 MS |
1065 | /* Note: the opposite of the above test does not |
1066 | exist. So if permissions are revoked this won't be | |
1067 | noticed immediately, only after the attribute | |
1068 | timeout has expired */ | |
9cfcac81 | 1069 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
10556cb2 | 1070 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1071 | return -ECHILD; |
1072 | ||
e8e96157 MS |
1073 | err = fuse_access(inode, mask); |
1074 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1075 | if (!(inode->i_mode & S_IXUGO)) { | |
1076 | if (refreshed) | |
1077 | return -EACCES; | |
1078 | ||
10556cb2 | 1079 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1080 | if (!err && !(inode->i_mode & S_IXUGO)) |
1081 | return -EACCES; | |
1082 | } | |
e5e5558e | 1083 | } |
244f6385 | 1084 | return err; |
e5e5558e MS |
1085 | } |
1086 | ||
1087 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
1088 | void *dstbuf, filldir_t filldir) | |
1089 | { | |
1090 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1091 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1092 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
1093 | int over; | |
1094 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1095 | return -EIO; | |
1096 | if (reclen > nbytes) | |
1097 | break; | |
1098 | ||
1099 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
1100 | file->f_pos, dirent->ino, dirent->type); | |
1101 | if (over) | |
1102 | break; | |
1103 | ||
1104 | buf += reclen; | |
1105 | nbytes -= reclen; | |
1106 | file->f_pos = dirent->off; | |
1107 | } | |
1108 | ||
1109 | return 0; | |
1110 | } | |
1111 | ||
04730fef | 1112 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 1113 | { |
04730fef MS |
1114 | int err; |
1115 | size_t nbytes; | |
1116 | struct page *page; | |
7706a9d6 | 1117 | struct inode *inode = file->f_path.dentry->d_inode; |
e5e5558e | 1118 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 MS |
1119 | struct fuse_req *req; |
1120 | ||
1121 | if (is_bad_inode(inode)) | |
1122 | return -EIO; | |
1123 | ||
ce1d5a49 MS |
1124 | req = fuse_get_req(fc); |
1125 | if (IS_ERR(req)) | |
1126 | return PTR_ERR(req); | |
e5e5558e | 1127 | |
04730fef MS |
1128 | page = alloc_page(GFP_KERNEL); |
1129 | if (!page) { | |
1130 | fuse_put_request(fc, req); | |
1131 | return -ENOMEM; | |
1132 | } | |
f4975c67 | 1133 | req->out.argpages = 1; |
04730fef MS |
1134 | req->num_pages = 1; |
1135 | req->pages[0] = page; | |
2106cb18 | 1136 | fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
b93f858a | 1137 | fuse_request_send(fc, req); |
361b1eb5 | 1138 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1139 | err = req->out.h.error; |
1140 | fuse_put_request(fc, req); | |
1141 | if (!err) | |
04730fef MS |
1142 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
1143 | filldir); | |
e5e5558e | 1144 | |
04730fef | 1145 | __free_page(page); |
b36c31ba | 1146 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 1147 | return err; |
e5e5558e MS |
1148 | } |
1149 | ||
1150 | static char *read_link(struct dentry *dentry) | |
1151 | { | |
1152 | struct inode *inode = dentry->d_inode; | |
1153 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 1154 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
1155 | char *link; |
1156 | ||
ce1d5a49 | 1157 | if (IS_ERR(req)) |
e231c2ee | 1158 | return ERR_CAST(req); |
e5e5558e MS |
1159 | |
1160 | link = (char *) __get_free_page(GFP_KERNEL); | |
1161 | if (!link) { | |
1162 | link = ERR_PTR(-ENOMEM); | |
1163 | goto out; | |
1164 | } | |
1165 | req->in.h.opcode = FUSE_READLINK; | |
1166 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1167 | req->out.argvar = 1; |
1168 | req->out.numargs = 1; | |
1169 | req->out.args[0].size = PAGE_SIZE - 1; | |
1170 | req->out.args[0].value = link; | |
b93f858a | 1171 | fuse_request_send(fc, req); |
e5e5558e MS |
1172 | if (req->out.h.error) { |
1173 | free_page((unsigned long) link); | |
1174 | link = ERR_PTR(req->out.h.error); | |
1175 | } else | |
1176 | link[req->out.args[0].size] = '\0'; | |
1177 | out: | |
1178 | fuse_put_request(fc, req); | |
b36c31ba | 1179 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
1180 | return link; |
1181 | } | |
1182 | ||
1183 | static void free_link(char *link) | |
1184 | { | |
1185 | if (!IS_ERR(link)) | |
1186 | free_page((unsigned long) link); | |
1187 | } | |
1188 | ||
1189 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1190 | { | |
1191 | nd_set_link(nd, read_link(dentry)); | |
1192 | return NULL; | |
1193 | } | |
1194 | ||
1195 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1196 | { | |
1197 | free_link(nd_get_link(nd)); | |
1198 | } | |
1199 | ||
1200 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1201 | { | |
91fe96b4 | 1202 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1203 | } |
1204 | ||
1205 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1206 | { | |
8b0797a4 MS |
1207 | fuse_release_common(file, FUSE_RELEASEDIR); |
1208 | ||
1209 | return 0; | |
e5e5558e MS |
1210 | } |
1211 | ||
02c24a82 JB |
1212 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1213 | int datasync) | |
82547981 | 1214 | { |
02c24a82 | 1215 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1216 | } |
1217 | ||
b18da0c5 MS |
1218 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1219 | unsigned long arg) | |
1220 | { | |
1221 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1222 | ||
1223 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1224 | if (fc->minor < 18) | |
1225 | return -ENOTTY; | |
1226 | ||
1227 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1228 | } | |
1229 | ||
1230 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1231 | unsigned long arg) | |
1232 | { | |
1233 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1234 | ||
1235 | if (fc->minor < 18) | |
1236 | return -ENOTTY; | |
1237 | ||
1238 | return fuse_ioctl_common(file, cmd, arg, | |
1239 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1240 | } | |
1241 | ||
17637cba MS |
1242 | static bool update_mtime(unsigned ivalid) |
1243 | { | |
1244 | /* Always update if mtime is explicitly set */ | |
1245 | if (ivalid & ATTR_MTIME_SET) | |
1246 | return true; | |
1247 | ||
1248 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ | |
1249 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1250 | return false; | |
1251 | ||
1252 | /* In all other cases update */ | |
1253 | return true; | |
1254 | } | |
1255 | ||
befc649c | 1256 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
1257 | { |
1258 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1259 | |
1260 | if (ivalid & ATTR_MODE) | |
befc649c | 1261 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1262 | if (ivalid & ATTR_UID) |
befc649c | 1263 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 1264 | if (ivalid & ATTR_GID) |
befc649c | 1265 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 1266 | if (ivalid & ATTR_SIZE) |
befc649c | 1267 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1268 | if (ivalid & ATTR_ATIME) { |
1269 | arg->valid |= FATTR_ATIME; | |
befc649c | 1270 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1271 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1272 | if (!(ivalid & ATTR_ATIME_SET)) | |
1273 | arg->valid |= FATTR_ATIME_NOW; | |
1274 | } | |
1275 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) { | |
1276 | arg->valid |= FATTR_MTIME; | |
befc649c | 1277 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba MS |
1278 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
1279 | if (!(ivalid & ATTR_MTIME_SET)) | |
1280 | arg->valid |= FATTR_MTIME_NOW; | |
befc649c | 1281 | } |
9e6268db MS |
1282 | } |
1283 | ||
3be5a52b MS |
1284 | /* |
1285 | * Prevent concurrent writepages on inode | |
1286 | * | |
1287 | * This is done by adding a negative bias to the inode write counter | |
1288 | * and waiting for all pending writes to finish. | |
1289 | */ | |
1290 | void fuse_set_nowrite(struct inode *inode) | |
1291 | { | |
1292 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1293 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1294 | ||
1295 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1296 | ||
1297 | spin_lock(&fc->lock); | |
1298 | BUG_ON(fi->writectr < 0); | |
1299 | fi->writectr += FUSE_NOWRITE; | |
1300 | spin_unlock(&fc->lock); | |
1301 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * Allow writepages on inode | |
1306 | * | |
1307 | * Remove the bias from the writecounter and send any queued | |
1308 | * writepages. | |
1309 | */ | |
1310 | static void __fuse_release_nowrite(struct inode *inode) | |
1311 | { | |
1312 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1313 | ||
1314 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1315 | fi->writectr = 0; | |
1316 | fuse_flush_writepages(inode); | |
1317 | } | |
1318 | ||
1319 | void fuse_release_nowrite(struct inode *inode) | |
1320 | { | |
1321 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1322 | ||
1323 | spin_lock(&fc->lock); | |
1324 | __fuse_release_nowrite(inode); | |
1325 | spin_unlock(&fc->lock); | |
1326 | } | |
1327 | ||
6f9f1180 MS |
1328 | /* |
1329 | * Set attributes, and at the same time refresh them. | |
1330 | * | |
1331 | * Truncation is slightly complicated, because the 'truncate' request | |
1332 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1333 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1334 | * and the actual truncation by hand. | |
6f9f1180 | 1335 | */ |
49d4914f MS |
1336 | static int fuse_do_setattr(struct dentry *entry, struct iattr *attr, |
1337 | struct file *file) | |
9e6268db MS |
1338 | { |
1339 | struct inode *inode = entry->d_inode; | |
1340 | struct fuse_conn *fc = get_fuse_conn(inode); | |
9e6268db MS |
1341 | struct fuse_req *req; |
1342 | struct fuse_setattr_in inarg; | |
1343 | struct fuse_attr_out outarg; | |
3be5a52b MS |
1344 | bool is_truncate = false; |
1345 | loff_t oldsize; | |
9e6268db | 1346 | int err; |
9e6268db | 1347 | |
e57ac683 MS |
1348 | if (!fuse_allow_task(fc, current)) |
1349 | return -EACCES; | |
1350 | ||
db78b877 CH |
1351 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1352 | attr->ia_valid |= ATTR_FORCE; | |
1353 | ||
1354 | err = inode_change_ok(inode, attr); | |
1355 | if (err) | |
1356 | return err; | |
1e9a4ed9 | 1357 | |
8d56addd MS |
1358 | if (attr->ia_valid & ATTR_OPEN) { |
1359 | if (fc->atomic_o_trunc) | |
1360 | return 0; | |
1361 | file = NULL; | |
1362 | } | |
6ff958ed | 1363 | |
2c27c65e | 1364 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1365 | is_truncate = true; |
9e6268db | 1366 | |
ce1d5a49 MS |
1367 | req = fuse_get_req(fc); |
1368 | if (IS_ERR(req)) | |
1369 | return PTR_ERR(req); | |
9e6268db | 1370 | |
3be5a52b MS |
1371 | if (is_truncate) |
1372 | fuse_set_nowrite(inode); | |
1373 | ||
9e6268db | 1374 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1375 | memset(&outarg, 0, sizeof(outarg)); |
befc649c | 1376 | iattr_to_fattr(attr, &inarg); |
49d4914f MS |
1377 | if (file) { |
1378 | struct fuse_file *ff = file->private_data; | |
1379 | inarg.valid |= FATTR_FH; | |
1380 | inarg.fh = ff->fh; | |
1381 | } | |
f3332114 MS |
1382 | if (attr->ia_valid & ATTR_SIZE) { |
1383 | /* For mandatory locking in truncate */ | |
1384 | inarg.valid |= FATTR_LOCKOWNER; | |
1385 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1386 | } | |
9e6268db MS |
1387 | req->in.h.opcode = FUSE_SETATTR; |
1388 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1389 | req->in.numargs = 1; |
1390 | req->in.args[0].size = sizeof(inarg); | |
1391 | req->in.args[0].value = &inarg; | |
1392 | req->out.numargs = 1; | |
0e9663ee MS |
1393 | if (fc->minor < 9) |
1394 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1395 | else | |
1396 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 1397 | req->out.args[0].value = &outarg; |
b93f858a | 1398 | fuse_request_send(fc, req); |
9e6268db MS |
1399 | err = req->out.h.error; |
1400 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1401 | if (err) { |
1402 | if (err == -EINTR) | |
1403 | fuse_invalidate_attr(inode); | |
3be5a52b | 1404 | goto error; |
e00d2c2d | 1405 | } |
9e6268db | 1406 | |
e00d2c2d MS |
1407 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1408 | make_bad_inode(inode); | |
3be5a52b MS |
1409 | err = -EIO; |
1410 | goto error; | |
1411 | } | |
1412 | ||
1413 | spin_lock(&fc->lock); | |
1414 | fuse_change_attributes_common(inode, &outarg.attr, | |
1415 | attr_timeout(&outarg)); | |
1416 | oldsize = inode->i_size; | |
1417 | i_size_write(inode, outarg.attr.size); | |
1418 | ||
1419 | if (is_truncate) { | |
1420 | /* NOTE: this may release/reacquire fc->lock */ | |
1421 | __fuse_release_nowrite(inode); | |
1422 | } | |
1423 | spin_unlock(&fc->lock); | |
1424 | ||
1425 | /* | |
1426 | * Only call invalidate_inode_pages2() after removing | |
1427 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1428 | */ | |
1429 | if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
c08d3b0e | 1430 | truncate_pagecache(inode, oldsize, outarg.attr.size); |
3be5a52b | 1431 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1432 | } |
1433 | ||
e00d2c2d | 1434 | return 0; |
3be5a52b MS |
1435 | |
1436 | error: | |
1437 | if (is_truncate) | |
1438 | fuse_release_nowrite(inode); | |
1439 | ||
1440 | return err; | |
9e6268db MS |
1441 | } |
1442 | ||
49d4914f MS |
1443 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1444 | { | |
1445 | if (attr->ia_valid & ATTR_FILE) | |
1446 | return fuse_do_setattr(entry, attr, attr->ia_file); | |
1447 | else | |
1448 | return fuse_do_setattr(entry, attr, NULL); | |
1449 | } | |
1450 | ||
e5e5558e MS |
1451 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1452 | struct kstat *stat) | |
1453 | { | |
1454 | struct inode *inode = entry->d_inode; | |
244f6385 | 1455 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 MS |
1456 | |
1457 | if (!fuse_allow_task(fc, current)) | |
1458 | return -EACCES; | |
1459 | ||
bcb4be80 | 1460 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1461 | } |
1462 | ||
92a8780e MS |
1463 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1464 | const void *value, size_t size, int flags) | |
1465 | { | |
1466 | struct inode *inode = entry->d_inode; | |
1467 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1468 | struct fuse_req *req; | |
1469 | struct fuse_setxattr_in inarg; | |
1470 | int err; | |
1471 | ||
92a8780e MS |
1472 | if (fc->no_setxattr) |
1473 | return -EOPNOTSUPP; | |
1474 | ||
ce1d5a49 MS |
1475 | req = fuse_get_req(fc); |
1476 | if (IS_ERR(req)) | |
1477 | return PTR_ERR(req); | |
92a8780e MS |
1478 | |
1479 | memset(&inarg, 0, sizeof(inarg)); | |
1480 | inarg.size = size; | |
1481 | inarg.flags = flags; | |
1482 | req->in.h.opcode = FUSE_SETXATTR; | |
1483 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1484 | req->in.numargs = 3; |
1485 | req->in.args[0].size = sizeof(inarg); | |
1486 | req->in.args[0].value = &inarg; | |
1487 | req->in.args[1].size = strlen(name) + 1; | |
1488 | req->in.args[1].value = name; | |
1489 | req->in.args[2].size = size; | |
1490 | req->in.args[2].value = value; | |
b93f858a | 1491 | fuse_request_send(fc, req); |
92a8780e MS |
1492 | err = req->out.h.error; |
1493 | fuse_put_request(fc, req); | |
1494 | if (err == -ENOSYS) { | |
1495 | fc->no_setxattr = 1; | |
1496 | err = -EOPNOTSUPP; | |
1497 | } | |
1498 | return err; | |
1499 | } | |
1500 | ||
1501 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1502 | void *value, size_t size) | |
1503 | { | |
1504 | struct inode *inode = entry->d_inode; | |
1505 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1506 | struct fuse_req *req; | |
1507 | struct fuse_getxattr_in inarg; | |
1508 | struct fuse_getxattr_out outarg; | |
1509 | ssize_t ret; | |
1510 | ||
1511 | if (fc->no_getxattr) | |
1512 | return -EOPNOTSUPP; | |
1513 | ||
ce1d5a49 MS |
1514 | req = fuse_get_req(fc); |
1515 | if (IS_ERR(req)) | |
1516 | return PTR_ERR(req); | |
92a8780e MS |
1517 | |
1518 | memset(&inarg, 0, sizeof(inarg)); | |
1519 | inarg.size = size; | |
1520 | req->in.h.opcode = FUSE_GETXATTR; | |
1521 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1522 | req->in.numargs = 2; |
1523 | req->in.args[0].size = sizeof(inarg); | |
1524 | req->in.args[0].value = &inarg; | |
1525 | req->in.args[1].size = strlen(name) + 1; | |
1526 | req->in.args[1].value = name; | |
1527 | /* This is really two different operations rolled into one */ | |
1528 | req->out.numargs = 1; | |
1529 | if (size) { | |
1530 | req->out.argvar = 1; | |
1531 | req->out.args[0].size = size; | |
1532 | req->out.args[0].value = value; | |
1533 | } else { | |
1534 | req->out.args[0].size = sizeof(outarg); | |
1535 | req->out.args[0].value = &outarg; | |
1536 | } | |
b93f858a | 1537 | fuse_request_send(fc, req); |
92a8780e MS |
1538 | ret = req->out.h.error; |
1539 | if (!ret) | |
1540 | ret = size ? req->out.args[0].size : outarg.size; | |
1541 | else { | |
1542 | if (ret == -ENOSYS) { | |
1543 | fc->no_getxattr = 1; | |
1544 | ret = -EOPNOTSUPP; | |
1545 | } | |
1546 | } | |
1547 | fuse_put_request(fc, req); | |
1548 | return ret; | |
1549 | } | |
1550 | ||
1551 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1552 | { | |
1553 | struct inode *inode = entry->d_inode; | |
1554 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1555 | struct fuse_req *req; | |
1556 | struct fuse_getxattr_in inarg; | |
1557 | struct fuse_getxattr_out outarg; | |
1558 | ssize_t ret; | |
1559 | ||
e57ac683 MS |
1560 | if (!fuse_allow_task(fc, current)) |
1561 | return -EACCES; | |
1562 | ||
92a8780e MS |
1563 | if (fc->no_listxattr) |
1564 | return -EOPNOTSUPP; | |
1565 | ||
ce1d5a49 MS |
1566 | req = fuse_get_req(fc); |
1567 | if (IS_ERR(req)) | |
1568 | return PTR_ERR(req); | |
92a8780e MS |
1569 | |
1570 | memset(&inarg, 0, sizeof(inarg)); | |
1571 | inarg.size = size; | |
1572 | req->in.h.opcode = FUSE_LISTXATTR; | |
1573 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1574 | req->in.numargs = 1; |
1575 | req->in.args[0].size = sizeof(inarg); | |
1576 | req->in.args[0].value = &inarg; | |
1577 | /* This is really two different operations rolled into one */ | |
1578 | req->out.numargs = 1; | |
1579 | if (size) { | |
1580 | req->out.argvar = 1; | |
1581 | req->out.args[0].size = size; | |
1582 | req->out.args[0].value = list; | |
1583 | } else { | |
1584 | req->out.args[0].size = sizeof(outarg); | |
1585 | req->out.args[0].value = &outarg; | |
1586 | } | |
b93f858a | 1587 | fuse_request_send(fc, req); |
92a8780e MS |
1588 | ret = req->out.h.error; |
1589 | if (!ret) | |
1590 | ret = size ? req->out.args[0].size : outarg.size; | |
1591 | else { | |
1592 | if (ret == -ENOSYS) { | |
1593 | fc->no_listxattr = 1; | |
1594 | ret = -EOPNOTSUPP; | |
1595 | } | |
1596 | } | |
1597 | fuse_put_request(fc, req); | |
1598 | return ret; | |
1599 | } | |
1600 | ||
1601 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1602 | { | |
1603 | struct inode *inode = entry->d_inode; | |
1604 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1605 | struct fuse_req *req; | |
1606 | int err; | |
1607 | ||
1608 | if (fc->no_removexattr) | |
1609 | return -EOPNOTSUPP; | |
1610 | ||
ce1d5a49 MS |
1611 | req = fuse_get_req(fc); |
1612 | if (IS_ERR(req)) | |
1613 | return PTR_ERR(req); | |
92a8780e MS |
1614 | |
1615 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1616 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1617 | req->in.numargs = 1; |
1618 | req->in.args[0].size = strlen(name) + 1; | |
1619 | req->in.args[0].value = name; | |
b93f858a | 1620 | fuse_request_send(fc, req); |
92a8780e MS |
1621 | err = req->out.h.error; |
1622 | fuse_put_request(fc, req); | |
1623 | if (err == -ENOSYS) { | |
1624 | fc->no_removexattr = 1; | |
1625 | err = -EOPNOTSUPP; | |
1626 | } | |
1627 | return err; | |
1628 | } | |
1629 | ||
754661f1 | 1630 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1631 | .lookup = fuse_lookup, |
9e6268db MS |
1632 | .mkdir = fuse_mkdir, |
1633 | .symlink = fuse_symlink, | |
1634 | .unlink = fuse_unlink, | |
1635 | .rmdir = fuse_rmdir, | |
1636 | .rename = fuse_rename, | |
1637 | .link = fuse_link, | |
1638 | .setattr = fuse_setattr, | |
1639 | .create = fuse_create, | |
1640 | .mknod = fuse_mknod, | |
e5e5558e MS |
1641 | .permission = fuse_permission, |
1642 | .getattr = fuse_getattr, | |
92a8780e MS |
1643 | .setxattr = fuse_setxattr, |
1644 | .getxattr = fuse_getxattr, | |
1645 | .listxattr = fuse_listxattr, | |
1646 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1647 | }; |
1648 | ||
4b6f5d20 | 1649 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1650 | .llseek = generic_file_llseek, |
e5e5558e MS |
1651 | .read = generic_read_dir, |
1652 | .readdir = fuse_readdir, | |
1653 | .open = fuse_dir_open, | |
1654 | .release = fuse_dir_release, | |
82547981 | 1655 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1656 | .unlocked_ioctl = fuse_dir_ioctl, |
1657 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1658 | }; |
1659 | ||
754661f1 | 1660 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1661 | .setattr = fuse_setattr, |
e5e5558e MS |
1662 | .permission = fuse_permission, |
1663 | .getattr = fuse_getattr, | |
92a8780e MS |
1664 | .setxattr = fuse_setxattr, |
1665 | .getxattr = fuse_getxattr, | |
1666 | .listxattr = fuse_listxattr, | |
1667 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1668 | }; |
1669 | ||
754661f1 | 1670 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1671 | .setattr = fuse_setattr, |
e5e5558e MS |
1672 | .follow_link = fuse_follow_link, |
1673 | .put_link = fuse_put_link, | |
1674 | .readlink = generic_readlink, | |
1675 | .getattr = fuse_getattr, | |
92a8780e MS |
1676 | .setxattr = fuse_setxattr, |
1677 | .getxattr = fuse_getxattr, | |
1678 | .listxattr = fuse_listxattr, | |
1679 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1680 | }; |
1681 | ||
1682 | void fuse_init_common(struct inode *inode) | |
1683 | { | |
1684 | inode->i_op = &fuse_common_inode_operations; | |
1685 | } | |
1686 | ||
1687 | void fuse_init_dir(struct inode *inode) | |
1688 | { | |
1689 | inode->i_op = &fuse_dir_inode_operations; | |
1690 | inode->i_fop = &fuse_dir_operations; | |
1691 | } | |
1692 | ||
1693 | void fuse_init_symlink(struct inode *inode) | |
1694 | { | |
1695 | inode->i_op = &fuse_symlink_inode_operations; | |
1696 | } |