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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); | |
b3d9b7a3 | 252 | if (!hlist_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 | */ | |
d9585277 | 372 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 373 | struct file *file, unsigned flags, |
d9585277 | 374 | umode_t mode, int *opened) |
fd72faac MS |
375 | { |
376 | int err; | |
377 | struct inode *inode; | |
378 | struct fuse_conn *fc = get_fuse_conn(dir); | |
379 | struct fuse_req *req; | |
07e77dca | 380 | struct fuse_forget_link *forget; |
e0a43ddc | 381 | struct fuse_create_in inarg; |
fd72faac MS |
382 | struct fuse_open_out outopen; |
383 | struct fuse_entry_out outentry; | |
fd72faac | 384 | struct fuse_file *ff; |
fd72faac | 385 | |
07e77dca | 386 | forget = fuse_alloc_forget(); |
c8ccbe03 | 387 | err = -ENOMEM; |
07e77dca | 388 | if (!forget) |
c8ccbe03 | 389 | goto out_err; |
51eb01e7 | 390 | |
ce1d5a49 | 391 | req = fuse_get_req(fc); |
51eb01e7 | 392 | err = PTR_ERR(req); |
ce1d5a49 | 393 | if (IS_ERR(req)) |
51eb01e7 | 394 | goto out_put_forget_req; |
fd72faac | 395 | |
ce1d5a49 | 396 | err = -ENOMEM; |
acf99433 | 397 | ff = fuse_file_alloc(fc); |
fd72faac MS |
398 | if (!ff) |
399 | goto out_put_request; | |
400 | ||
e0a43ddc MS |
401 | if (!fc->dont_mask) |
402 | mode &= ~current_umask(); | |
403 | ||
fd72faac MS |
404 | flags &= ~O_NOCTTY; |
405 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 406 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
407 | inarg.flags = flags; |
408 | inarg.mode = mode; | |
e0a43ddc | 409 | inarg.umask = current_umask(); |
fd72faac MS |
410 | req->in.h.opcode = FUSE_CREATE; |
411 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac | 412 | req->in.numargs = 2; |
e0a43ddc MS |
413 | req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : |
414 | sizeof(inarg); | |
fd72faac MS |
415 | req->in.args[0].value = &inarg; |
416 | req->in.args[1].size = entry->d_name.len + 1; | |
417 | req->in.args[1].value = entry->d_name.name; | |
418 | req->out.numargs = 2; | |
0e9663ee MS |
419 | if (fc->minor < 9) |
420 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
421 | else | |
422 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
423 | req->out.args[0].value = &outentry; |
424 | req->out.args[1].size = sizeof(outopen); | |
425 | req->out.args[1].value = &outopen; | |
b93f858a | 426 | fuse_request_send(fc, req); |
fd72faac | 427 | err = req->out.h.error; |
c8ccbe03 | 428 | if (err) |
fd72faac | 429 | goto out_free_ff; |
fd72faac MS |
430 | |
431 | err = -EIO; | |
2827d0b2 | 432 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
433 | goto out_free_ff; |
434 | ||
51eb01e7 | 435 | fuse_put_request(fc, req); |
c7b7143c MS |
436 | ff->fh = outopen.fh; |
437 | ff->nodeid = outentry.nodeid; | |
438 | ff->open_flags = outopen.open_flags; | |
fd72faac | 439 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 440 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
441 | if (!inode) { |
442 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 443 | fuse_sync_release(ff, flags); |
07e77dca | 444 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
445 | err = -ENOMEM; |
446 | goto out_err; | |
fd72faac | 447 | } |
07e77dca | 448 | kfree(forget); |
fd72faac | 449 | d_instantiate(entry, inode); |
1fb69e78 | 450 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 451 | fuse_invalidate_attr(dir); |
30d90494 AV |
452 | err = finish_open(file, entry, generic_file_open, opened); |
453 | if (err) { | |
8b0797a4 | 454 | fuse_sync_release(ff, flags); |
c8ccbe03 MS |
455 | } else { |
456 | file->private_data = fuse_file_get(ff); | |
457 | fuse_finish_open(inode, file); | |
fd72faac | 458 | } |
d9585277 | 459 | return err; |
fd72faac | 460 | |
c8ccbe03 | 461 | out_free_ff: |
fd72faac | 462 | fuse_file_free(ff); |
c8ccbe03 | 463 | out_put_request: |
fd72faac | 464 | fuse_put_request(fc, req); |
c8ccbe03 | 465 | out_put_forget_req: |
07e77dca | 466 | kfree(forget); |
c8ccbe03 | 467 | out_err: |
d9585277 | 468 | return err; |
c8ccbe03 MS |
469 | } |
470 | ||
471 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 472 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 473 | struct file *file, unsigned flags, |
d9585277 | 474 | umode_t mode, int *opened) |
c8ccbe03 MS |
475 | { |
476 | int err; | |
477 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
478 | struct dentry *res = NULL; |
479 | ||
480 | if (d_unhashed(entry)) { | |
481 | res = fuse_lookup(dir, entry, NULL); | |
482 | if (IS_ERR(res)) | |
d9585277 | 483 | return PTR_ERR(res); |
c8ccbe03 MS |
484 | |
485 | if (res) | |
486 | entry = res; | |
487 | } | |
488 | ||
489 | if (!(flags & O_CREAT) || entry->d_inode) | |
490 | goto no_open; | |
491 | ||
492 | /* Only creates */ | |
47237687 | 493 | *opened |= FILE_CREATED; |
c8ccbe03 MS |
494 | |
495 | if (fc->no_create) | |
496 | goto mknod; | |
497 | ||
30d90494 | 498 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
d9585277 | 499 | if (err == -ENOSYS) { |
c8ccbe03 MS |
500 | fc->no_create = 1; |
501 | goto mknod; | |
502 | } | |
503 | out_dput: | |
504 | dput(res); | |
d9585277 | 505 | return err; |
c8ccbe03 MS |
506 | |
507 | mknod: | |
508 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 509 | if (err) |
c8ccbe03 | 510 | goto out_dput; |
c8ccbe03 | 511 | no_open: |
30d90494 | 512 | finish_no_open(file, res); |
d9585277 | 513 | return 1; |
fd72faac MS |
514 | } |
515 | ||
6f9f1180 MS |
516 | /* |
517 | * Code shared between mknod, mkdir, symlink and link | |
518 | */ | |
9e6268db MS |
519 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
520 | struct inode *dir, struct dentry *entry, | |
541af6a0 | 521 | umode_t mode) |
9e6268db MS |
522 | { |
523 | struct fuse_entry_out outarg; | |
524 | struct inode *inode; | |
9e6268db | 525 | int err; |
07e77dca | 526 | struct fuse_forget_link *forget; |
2d51013e | 527 | |
07e77dca MS |
528 | forget = fuse_alloc_forget(); |
529 | if (!forget) { | |
2d51013e | 530 | fuse_put_request(fc, req); |
07e77dca | 531 | return -ENOMEM; |
2d51013e | 532 | } |
9e6268db | 533 | |
0e9663ee | 534 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 535 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 536 | req->out.numargs = 1; |
0e9663ee MS |
537 | if (fc->minor < 9) |
538 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
539 | else | |
540 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 541 | req->out.args[0].value = &outarg; |
b93f858a | 542 | fuse_request_send(fc, req); |
9e6268db | 543 | err = req->out.h.error; |
2d51013e MS |
544 | fuse_put_request(fc, req); |
545 | if (err) | |
546 | goto out_put_forget_req; | |
547 | ||
39ee059a MS |
548 | err = -EIO; |
549 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 550 | goto out_put_forget_req; |
39ee059a MS |
551 | |
552 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 553 | goto out_put_forget_req; |
39ee059a | 554 | |
9e6268db | 555 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 556 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 557 | if (!inode) { |
07e77dca | 558 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
559 | return -ENOMEM; |
560 | } | |
07e77dca | 561 | kfree(forget); |
9e6268db | 562 | |
d2a85164 MS |
563 | if (S_ISDIR(inode->i_mode)) { |
564 | struct dentry *alias; | |
565 | mutex_lock(&fc->inst_mutex); | |
566 | alias = d_find_alias(inode); | |
567 | if (alias) { | |
568 | /* New directory must have moved since mkdir */ | |
569 | mutex_unlock(&fc->inst_mutex); | |
570 | dput(alias); | |
571 | iput(inode); | |
572 | return -EBUSY; | |
573 | } | |
574 | d_instantiate(entry, inode); | |
575 | mutex_unlock(&fc->inst_mutex); | |
576 | } else | |
577 | d_instantiate(entry, inode); | |
9e6268db | 578 | |
1fb69e78 | 579 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
580 | fuse_invalidate_attr(dir); |
581 | return 0; | |
39ee059a | 582 | |
2d51013e | 583 | out_put_forget_req: |
07e77dca | 584 | kfree(forget); |
39ee059a | 585 | return err; |
9e6268db MS |
586 | } |
587 | ||
1a67aafb | 588 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
589 | dev_t rdev) |
590 | { | |
591 | struct fuse_mknod_in inarg; | |
592 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
593 | struct fuse_req *req = fuse_get_req(fc); |
594 | if (IS_ERR(req)) | |
595 | return PTR_ERR(req); | |
9e6268db | 596 | |
e0a43ddc MS |
597 | if (!fc->dont_mask) |
598 | mode &= ~current_umask(); | |
599 | ||
9e6268db MS |
600 | memset(&inarg, 0, sizeof(inarg)); |
601 | inarg.mode = mode; | |
602 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 603 | inarg.umask = current_umask(); |
9e6268db MS |
604 | req->in.h.opcode = FUSE_MKNOD; |
605 | req->in.numargs = 2; | |
e0a43ddc MS |
606 | req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : |
607 | sizeof(inarg); | |
9e6268db MS |
608 | req->in.args[0].value = &inarg; |
609 | req->in.args[1].size = entry->d_name.len + 1; | |
610 | req->in.args[1].value = entry->d_name.name; | |
611 | return create_new_entry(fc, req, dir, entry, mode); | |
612 | } | |
613 | ||
4acdaf27 | 614 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
615 | struct nameidata *nd) |
616 | { | |
617 | return fuse_mknod(dir, entry, mode, 0); | |
618 | } | |
619 | ||
18bb1db3 | 620 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
621 | { |
622 | struct fuse_mkdir_in inarg; | |
623 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
624 | struct fuse_req *req = fuse_get_req(fc); |
625 | if (IS_ERR(req)) | |
626 | return PTR_ERR(req); | |
9e6268db | 627 | |
e0a43ddc MS |
628 | if (!fc->dont_mask) |
629 | mode &= ~current_umask(); | |
630 | ||
9e6268db MS |
631 | memset(&inarg, 0, sizeof(inarg)); |
632 | inarg.mode = mode; | |
e0a43ddc | 633 | inarg.umask = current_umask(); |
9e6268db MS |
634 | req->in.h.opcode = FUSE_MKDIR; |
635 | req->in.numargs = 2; | |
636 | req->in.args[0].size = sizeof(inarg); | |
637 | req->in.args[0].value = &inarg; | |
638 | req->in.args[1].size = entry->d_name.len + 1; | |
639 | req->in.args[1].value = entry->d_name.name; | |
640 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
641 | } | |
642 | ||
643 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
644 | const char *link) | |
645 | { | |
646 | struct fuse_conn *fc = get_fuse_conn(dir); | |
647 | unsigned len = strlen(link) + 1; | |
ce1d5a49 MS |
648 | struct fuse_req *req = fuse_get_req(fc); |
649 | if (IS_ERR(req)) | |
650 | return PTR_ERR(req); | |
9e6268db MS |
651 | |
652 | req->in.h.opcode = FUSE_SYMLINK; | |
653 | req->in.numargs = 2; | |
654 | req->in.args[0].size = entry->d_name.len + 1; | |
655 | req->in.args[0].value = entry->d_name.name; | |
656 | req->in.args[1].size = len; | |
657 | req->in.args[1].value = link; | |
658 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
659 | } | |
660 | ||
661 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
662 | { | |
663 | int err; | |
664 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
665 | struct fuse_req *req = fuse_get_req(fc); |
666 | if (IS_ERR(req)) | |
667 | return PTR_ERR(req); | |
9e6268db MS |
668 | |
669 | req->in.h.opcode = FUSE_UNLINK; | |
670 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
671 | req->in.numargs = 1; |
672 | req->in.args[0].size = entry->d_name.len + 1; | |
673 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 674 | fuse_request_send(fc, req); |
9e6268db MS |
675 | err = req->out.h.error; |
676 | fuse_put_request(fc, req); | |
677 | if (!err) { | |
678 | struct inode *inode = entry->d_inode; | |
ac45d613 | 679 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 680 | |
ac45d613 MS |
681 | spin_lock(&fc->lock); |
682 | fi->attr_version = ++fc->attr_version; | |
683 | drop_nlink(inode); | |
684 | spin_unlock(&fc->lock); | |
9e6268db MS |
685 | fuse_invalidate_attr(inode); |
686 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 687 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
688 | } else if (err == -EINTR) |
689 | fuse_invalidate_entry(entry); | |
690 | return err; | |
691 | } | |
692 | ||
693 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
694 | { | |
695 | int err; | |
696 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
697 | struct fuse_req *req = fuse_get_req(fc); |
698 | if (IS_ERR(req)) | |
699 | return PTR_ERR(req); | |
9e6268db MS |
700 | |
701 | req->in.h.opcode = FUSE_RMDIR; | |
702 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
703 | req->in.numargs = 1; |
704 | req->in.args[0].size = entry->d_name.len + 1; | |
705 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 706 | fuse_request_send(fc, req); |
9e6268db MS |
707 | err = req->out.h.error; |
708 | fuse_put_request(fc, req); | |
709 | if (!err) { | |
ce71ec36 | 710 | clear_nlink(entry->d_inode); |
9e6268db | 711 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 712 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
713 | } else if (err == -EINTR) |
714 | fuse_invalidate_entry(entry); | |
715 | return err; | |
716 | } | |
717 | ||
718 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
719 | struct inode *newdir, struct dentry *newent) | |
720 | { | |
721 | int err; | |
722 | struct fuse_rename_in inarg; | |
723 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 | 724 | struct fuse_req *req = fuse_get_req(fc); |
e4eaac06 | 725 | |
ce1d5a49 MS |
726 | if (IS_ERR(req)) |
727 | return PTR_ERR(req); | |
9e6268db MS |
728 | |
729 | memset(&inarg, 0, sizeof(inarg)); | |
730 | inarg.newdir = get_node_id(newdir); | |
731 | req->in.h.opcode = FUSE_RENAME; | |
732 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
733 | req->in.numargs = 3; |
734 | req->in.args[0].size = sizeof(inarg); | |
735 | req->in.args[0].value = &inarg; | |
736 | req->in.args[1].size = oldent->d_name.len + 1; | |
737 | req->in.args[1].value = oldent->d_name.name; | |
738 | req->in.args[2].size = newent->d_name.len + 1; | |
739 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 740 | fuse_request_send(fc, req); |
9e6268db MS |
741 | err = req->out.h.error; |
742 | fuse_put_request(fc, req); | |
743 | if (!err) { | |
08b63307 MS |
744 | /* ctime changes */ |
745 | fuse_invalidate_attr(oldent->d_inode); | |
746 | ||
9e6268db MS |
747 | fuse_invalidate_attr(olddir); |
748 | if (olddir != newdir) | |
749 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
750 | |
751 | /* newent will end up negative */ | |
5219f346 MS |
752 | if (newent->d_inode) { |
753 | fuse_invalidate_attr(newent->d_inode); | |
8cbdf1e6 | 754 | fuse_invalidate_entry_cache(newent); |
5219f346 | 755 | } |
9e6268db MS |
756 | } else if (err == -EINTR) { |
757 | /* If request was interrupted, DEITY only knows if the | |
758 | rename actually took place. If the invalidation | |
759 | fails (e.g. some process has CWD under the renamed | |
760 | directory), then there can be inconsistency between | |
761 | the dcache and the real filesystem. Tough luck. */ | |
762 | fuse_invalidate_entry(oldent); | |
763 | if (newent->d_inode) | |
764 | fuse_invalidate_entry(newent); | |
765 | } | |
766 | ||
767 | return err; | |
768 | } | |
769 | ||
770 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
771 | struct dentry *newent) | |
772 | { | |
773 | int err; | |
774 | struct fuse_link_in inarg; | |
775 | struct inode *inode = entry->d_inode; | |
776 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
777 | struct fuse_req *req = fuse_get_req(fc); |
778 | if (IS_ERR(req)) | |
779 | return PTR_ERR(req); | |
9e6268db MS |
780 | |
781 | memset(&inarg, 0, sizeof(inarg)); | |
782 | inarg.oldnodeid = get_node_id(inode); | |
783 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
784 | req->in.numargs = 2; |
785 | req->in.args[0].size = sizeof(inarg); | |
786 | req->in.args[0].value = &inarg; | |
787 | req->in.args[1].size = newent->d_name.len + 1; | |
788 | req->in.args[1].value = newent->d_name.name; | |
789 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
790 | /* Contrary to "normal" filesystems it can happen that link | |
791 | makes two "logical" inodes point to the same "physical" | |
792 | inode. We invalidate the attributes of the old one, so it | |
793 | will reflect changes in the backing inode (link count, | |
794 | etc.) | |
795 | */ | |
ac45d613 MS |
796 | if (!err) { |
797 | struct fuse_inode *fi = get_fuse_inode(inode); | |
798 | ||
799 | spin_lock(&fc->lock); | |
800 | fi->attr_version = ++fc->attr_version; | |
801 | inc_nlink(inode); | |
802 | spin_unlock(&fc->lock); | |
9e6268db | 803 | fuse_invalidate_attr(inode); |
ac45d613 MS |
804 | } else if (err == -EINTR) { |
805 | fuse_invalidate_attr(inode); | |
806 | } | |
9e6268db MS |
807 | return err; |
808 | } | |
809 | ||
1fb69e78 MS |
810 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
811 | struct kstat *stat) | |
812 | { | |
203627bb MS |
813 | unsigned int blkbits; |
814 | ||
1fb69e78 MS |
815 | stat->dev = inode->i_sb->s_dev; |
816 | stat->ino = attr->ino; | |
817 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
818 | stat->nlink = attr->nlink; | |
819 | stat->uid = attr->uid; | |
820 | stat->gid = attr->gid; | |
821 | stat->rdev = inode->i_rdev; | |
822 | stat->atime.tv_sec = attr->atime; | |
823 | stat->atime.tv_nsec = attr->atimensec; | |
824 | stat->mtime.tv_sec = attr->mtime; | |
825 | stat->mtime.tv_nsec = attr->mtimensec; | |
826 | stat->ctime.tv_sec = attr->ctime; | |
827 | stat->ctime.tv_nsec = attr->ctimensec; | |
828 | stat->size = attr->size; | |
829 | stat->blocks = attr->blocks; | |
203627bb MS |
830 | |
831 | if (attr->blksize != 0) | |
832 | blkbits = ilog2(attr->blksize); | |
833 | else | |
834 | blkbits = inode->i_sb->s_blocksize_bits; | |
835 | ||
836 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
837 | } |
838 | ||
c79e322f MS |
839 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
840 | struct file *file) | |
e5e5558e MS |
841 | { |
842 | int err; | |
c79e322f MS |
843 | struct fuse_getattr_in inarg; |
844 | struct fuse_attr_out outarg; | |
e5e5558e | 845 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
846 | struct fuse_req *req; |
847 | u64 attr_version; | |
848 | ||
849 | req = fuse_get_req(fc); | |
ce1d5a49 MS |
850 | if (IS_ERR(req)) |
851 | return PTR_ERR(req); | |
e5e5558e | 852 | |
7dca9fd3 | 853 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 854 | |
c79e322f | 855 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 856 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
857 | /* Directories have separate file-handle space */ |
858 | if (file && S_ISREG(inode->i_mode)) { | |
859 | struct fuse_file *ff = file->private_data; | |
860 | ||
861 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
862 | inarg.fh = ff->fh; | |
863 | } | |
e5e5558e MS |
864 | req->in.h.opcode = FUSE_GETATTR; |
865 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
866 | req->in.numargs = 1; |
867 | req->in.args[0].size = sizeof(inarg); | |
868 | req->in.args[0].value = &inarg; | |
e5e5558e | 869 | req->out.numargs = 1; |
0e9663ee MS |
870 | if (fc->minor < 9) |
871 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
872 | else | |
873 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 874 | req->out.args[0].value = &outarg; |
b93f858a | 875 | fuse_request_send(fc, req); |
e5e5558e MS |
876 | err = req->out.h.error; |
877 | fuse_put_request(fc, req); | |
878 | if (!err) { | |
c79e322f | 879 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
880 | make_bad_inode(inode); |
881 | err = -EIO; | |
882 | } else { | |
c79e322f MS |
883 | fuse_change_attributes(inode, &outarg.attr, |
884 | attr_timeout(&outarg), | |
1fb69e78 MS |
885 | attr_version); |
886 | if (stat) | |
c79e322f | 887 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
888 | } |
889 | } | |
890 | return err; | |
891 | } | |
892 | ||
bcb4be80 MS |
893 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
894 | struct file *file, bool *refreshed) | |
895 | { | |
896 | struct fuse_inode *fi = get_fuse_inode(inode); | |
897 | int err; | |
898 | bool r; | |
899 | ||
900 | if (fi->i_time < get_jiffies_64()) { | |
901 | r = true; | |
902 | err = fuse_do_getattr(inode, stat, file); | |
903 | } else { | |
904 | r = false; | |
905 | err = 0; | |
906 | if (stat) { | |
907 | generic_fillattr(inode, stat); | |
908 | stat->mode = fi->orig_i_mode; | |
45c72cd7 | 909 | stat->ino = fi->orig_ino; |
bcb4be80 MS |
910 | } |
911 | } | |
912 | ||
913 | if (refreshed != NULL) | |
914 | *refreshed = r; | |
915 | ||
916 | return err; | |
917 | } | |
918 | ||
3b463ae0 | 919 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 920 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
921 | { |
922 | int err = -ENOTDIR; | |
923 | struct inode *parent; | |
924 | struct dentry *dir; | |
925 | struct dentry *entry; | |
926 | ||
927 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
928 | if (!parent) | |
929 | return -ENOENT; | |
930 | ||
931 | mutex_lock(&parent->i_mutex); | |
932 | if (!S_ISDIR(parent->i_mode)) | |
933 | goto unlock; | |
934 | ||
935 | err = -ENOENT; | |
936 | dir = d_find_alias(parent); | |
937 | if (!dir) | |
938 | goto unlock; | |
939 | ||
940 | entry = d_lookup(dir, name); | |
941 | dput(dir); | |
942 | if (!entry) | |
943 | goto unlock; | |
944 | ||
945 | fuse_invalidate_attr(parent); | |
946 | fuse_invalidate_entry(entry); | |
451d0f59 JM |
947 | |
948 | if (child_nodeid != 0 && entry->d_inode) { | |
949 | mutex_lock(&entry->d_inode->i_mutex); | |
950 | if (get_node_id(entry->d_inode) != child_nodeid) { | |
951 | err = -ENOENT; | |
952 | goto badentry; | |
953 | } | |
954 | if (d_mountpoint(entry)) { | |
955 | err = -EBUSY; | |
956 | goto badentry; | |
957 | } | |
958 | if (S_ISDIR(entry->d_inode->i_mode)) { | |
959 | shrink_dcache_parent(entry); | |
960 | if (!simple_empty(entry)) { | |
961 | err = -ENOTEMPTY; | |
962 | goto badentry; | |
963 | } | |
964 | entry->d_inode->i_flags |= S_DEAD; | |
965 | } | |
966 | dont_mount(entry); | |
967 | clear_nlink(entry->d_inode); | |
968 | err = 0; | |
969 | badentry: | |
970 | mutex_unlock(&entry->d_inode->i_mutex); | |
971 | if (!err) | |
972 | d_delete(entry); | |
973 | } else { | |
974 | err = 0; | |
975 | } | |
3b463ae0 | 976 | dput(entry); |
3b463ae0 JM |
977 | |
978 | unlock: | |
979 | mutex_unlock(&parent->i_mutex); | |
980 | iput(parent); | |
981 | return err; | |
982 | } | |
983 | ||
87729a55 MS |
984 | /* |
985 | * Calling into a user-controlled filesystem gives the filesystem | |
986 | * daemon ptrace-like capabilities over the requester process. This | |
987 | * means, that the filesystem daemon is able to record the exact | |
988 | * filesystem operations performed, and can also control the behavior | |
989 | * of the requester process in otherwise impossible ways. For example | |
990 | * it can delay the operation for arbitrary length of time allowing | |
991 | * DoS against the requester. | |
992 | * | |
993 | * For this reason only those processes can call into the filesystem, | |
994 | * for which the owner of the mount has ptrace privilege. This | |
995 | * excludes processes started by other users, suid or sgid processes. | |
996 | */ | |
e57ac683 | 997 | int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) |
87729a55 | 998 | { |
c69e8d9c DH |
999 | const struct cred *cred; |
1000 | int ret; | |
87729a55 | 1001 | |
c69e8d9c | 1002 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
1003 | return 1; |
1004 | ||
c69e8d9c DH |
1005 | rcu_read_lock(); |
1006 | ret = 0; | |
1007 | cred = __task_cred(task); | |
1008 | if (cred->euid == fc->user_id && | |
1009 | cred->suid == fc->user_id && | |
1010 | cred->uid == fc->user_id && | |
1011 | cred->egid == fc->group_id && | |
1012 | cred->sgid == fc->group_id && | |
1013 | cred->gid == fc->group_id) | |
1014 | ret = 1; | |
1015 | rcu_read_unlock(); | |
1016 | ||
1017 | return ret; | |
87729a55 MS |
1018 | } |
1019 | ||
31d40d74 MS |
1020 | static int fuse_access(struct inode *inode, int mask) |
1021 | { | |
1022 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1023 | struct fuse_req *req; | |
1024 | struct fuse_access_in inarg; | |
1025 | int err; | |
1026 | ||
1027 | if (fc->no_access) | |
1028 | return 0; | |
1029 | ||
ce1d5a49 MS |
1030 | req = fuse_get_req(fc); |
1031 | if (IS_ERR(req)) | |
1032 | return PTR_ERR(req); | |
31d40d74 MS |
1033 | |
1034 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 1035 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
1036 | req->in.h.opcode = FUSE_ACCESS; |
1037 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
1038 | req->in.numargs = 1; |
1039 | req->in.args[0].size = sizeof(inarg); | |
1040 | req->in.args[0].value = &inarg; | |
b93f858a | 1041 | fuse_request_send(fc, req); |
31d40d74 MS |
1042 | err = req->out.h.error; |
1043 | fuse_put_request(fc, req); | |
1044 | if (err == -ENOSYS) { | |
1045 | fc->no_access = 1; | |
1046 | err = 0; | |
1047 | } | |
1048 | return err; | |
1049 | } | |
1050 | ||
10556cb2 | 1051 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1052 | { |
10556cb2 | 1053 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1054 | return -ECHILD; |
1055 | ||
1056 | return fuse_do_getattr(inode, NULL, NULL); | |
1057 | } | |
1058 | ||
6f9f1180 MS |
1059 | /* |
1060 | * Check permission. The two basic access models of FUSE are: | |
1061 | * | |
1062 | * 1) Local access checking ('default_permissions' mount option) based | |
1063 | * on file mode. This is the plain old disk filesystem permission | |
1064 | * modell. | |
1065 | * | |
1066 | * 2) "Remote" access checking, where server is responsible for | |
1067 | * checking permission in each inode operation. An exception to this | |
1068 | * is if ->permission() was invoked from sys_access() in which case an | |
1069 | * access request is sent. Execute permission is still checked | |
1070 | * locally based on file mode. | |
1071 | */ | |
10556cb2 | 1072 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1073 | { |
1074 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1075 | bool refreshed = false; |
1076 | int err = 0; | |
e5e5558e | 1077 | |
87729a55 | 1078 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 1079 | return -EACCES; |
244f6385 MS |
1080 | |
1081 | /* | |
e8e96157 | 1082 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1083 | */ |
e8e96157 MS |
1084 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1085 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
19690ddb MS |
1086 | struct fuse_inode *fi = get_fuse_inode(inode); |
1087 | ||
1088 | if (fi->i_time < get_jiffies_64()) { | |
1089 | refreshed = true; | |
1090 | ||
10556cb2 | 1091 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1092 | if (err) |
1093 | return err; | |
1094 | } | |
244f6385 MS |
1095 | } |
1096 | ||
1097 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
2830ba7f | 1098 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1099 | |
1100 | /* If permission is denied, try to refresh file | |
1101 | attributes. This is also needed, because the root | |
1102 | node will at first have no permissions */ | |
244f6385 | 1103 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1104 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1105 | if (!err) |
2830ba7f | 1106 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1107 | } |
1108 | ||
6f9f1180 MS |
1109 | /* Note: the opposite of the above test does not |
1110 | exist. So if permissions are revoked this won't be | |
1111 | noticed immediately, only after the attribute | |
1112 | timeout has expired */ | |
9cfcac81 | 1113 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
10556cb2 | 1114 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1115 | return -ECHILD; |
1116 | ||
e8e96157 MS |
1117 | err = fuse_access(inode, mask); |
1118 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1119 | if (!(inode->i_mode & S_IXUGO)) { | |
1120 | if (refreshed) | |
1121 | return -EACCES; | |
1122 | ||
10556cb2 | 1123 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1124 | if (!err && !(inode->i_mode & S_IXUGO)) |
1125 | return -EACCES; | |
1126 | } | |
e5e5558e | 1127 | } |
244f6385 | 1128 | return err; |
e5e5558e MS |
1129 | } |
1130 | ||
1131 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
1132 | void *dstbuf, filldir_t filldir) | |
1133 | { | |
1134 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1135 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1136 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
1137 | int over; | |
1138 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1139 | return -EIO; | |
1140 | if (reclen > nbytes) | |
1141 | break; | |
1142 | ||
1143 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
1144 | file->f_pos, dirent->ino, dirent->type); | |
1145 | if (over) | |
1146 | break; | |
1147 | ||
1148 | buf += reclen; | |
1149 | nbytes -= reclen; | |
1150 | file->f_pos = dirent->off; | |
1151 | } | |
1152 | ||
1153 | return 0; | |
1154 | } | |
1155 | ||
04730fef | 1156 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 1157 | { |
04730fef MS |
1158 | int err; |
1159 | size_t nbytes; | |
1160 | struct page *page; | |
7706a9d6 | 1161 | struct inode *inode = file->f_path.dentry->d_inode; |
e5e5558e | 1162 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 MS |
1163 | struct fuse_req *req; |
1164 | ||
1165 | if (is_bad_inode(inode)) | |
1166 | return -EIO; | |
1167 | ||
ce1d5a49 MS |
1168 | req = fuse_get_req(fc); |
1169 | if (IS_ERR(req)) | |
1170 | return PTR_ERR(req); | |
e5e5558e | 1171 | |
04730fef MS |
1172 | page = alloc_page(GFP_KERNEL); |
1173 | if (!page) { | |
1174 | fuse_put_request(fc, req); | |
1175 | return -ENOMEM; | |
1176 | } | |
f4975c67 | 1177 | req->out.argpages = 1; |
04730fef MS |
1178 | req->num_pages = 1; |
1179 | req->pages[0] = page; | |
2106cb18 | 1180 | fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
b93f858a | 1181 | fuse_request_send(fc, req); |
361b1eb5 | 1182 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1183 | err = req->out.h.error; |
1184 | fuse_put_request(fc, req); | |
1185 | if (!err) | |
04730fef MS |
1186 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
1187 | filldir); | |
e5e5558e | 1188 | |
04730fef | 1189 | __free_page(page); |
b36c31ba | 1190 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 1191 | return err; |
e5e5558e MS |
1192 | } |
1193 | ||
1194 | static char *read_link(struct dentry *dentry) | |
1195 | { | |
1196 | struct inode *inode = dentry->d_inode; | |
1197 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 1198 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
1199 | char *link; |
1200 | ||
ce1d5a49 | 1201 | if (IS_ERR(req)) |
e231c2ee | 1202 | return ERR_CAST(req); |
e5e5558e MS |
1203 | |
1204 | link = (char *) __get_free_page(GFP_KERNEL); | |
1205 | if (!link) { | |
1206 | link = ERR_PTR(-ENOMEM); | |
1207 | goto out; | |
1208 | } | |
1209 | req->in.h.opcode = FUSE_READLINK; | |
1210 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1211 | req->out.argvar = 1; |
1212 | req->out.numargs = 1; | |
1213 | req->out.args[0].size = PAGE_SIZE - 1; | |
1214 | req->out.args[0].value = link; | |
b93f858a | 1215 | fuse_request_send(fc, req); |
e5e5558e MS |
1216 | if (req->out.h.error) { |
1217 | free_page((unsigned long) link); | |
1218 | link = ERR_PTR(req->out.h.error); | |
1219 | } else | |
1220 | link[req->out.args[0].size] = '\0'; | |
1221 | out: | |
1222 | fuse_put_request(fc, req); | |
b36c31ba | 1223 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
1224 | return link; |
1225 | } | |
1226 | ||
1227 | static void free_link(char *link) | |
1228 | { | |
1229 | if (!IS_ERR(link)) | |
1230 | free_page((unsigned long) link); | |
1231 | } | |
1232 | ||
1233 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1234 | { | |
1235 | nd_set_link(nd, read_link(dentry)); | |
1236 | return NULL; | |
1237 | } | |
1238 | ||
1239 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1240 | { | |
1241 | free_link(nd_get_link(nd)); | |
1242 | } | |
1243 | ||
1244 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1245 | { | |
91fe96b4 | 1246 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1247 | } |
1248 | ||
1249 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1250 | { | |
8b0797a4 MS |
1251 | fuse_release_common(file, FUSE_RELEASEDIR); |
1252 | ||
1253 | return 0; | |
e5e5558e MS |
1254 | } |
1255 | ||
02c24a82 JB |
1256 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1257 | int datasync) | |
82547981 | 1258 | { |
02c24a82 | 1259 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1260 | } |
1261 | ||
b18da0c5 MS |
1262 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1263 | unsigned long arg) | |
1264 | { | |
1265 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1266 | ||
1267 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1268 | if (fc->minor < 18) | |
1269 | return -ENOTTY; | |
1270 | ||
1271 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1272 | } | |
1273 | ||
1274 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1275 | unsigned long arg) | |
1276 | { | |
1277 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1278 | ||
1279 | if (fc->minor < 18) | |
1280 | return -ENOTTY; | |
1281 | ||
1282 | return fuse_ioctl_common(file, cmd, arg, | |
1283 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1284 | } | |
1285 | ||
17637cba MS |
1286 | static bool update_mtime(unsigned ivalid) |
1287 | { | |
1288 | /* Always update if mtime is explicitly set */ | |
1289 | if (ivalid & ATTR_MTIME_SET) | |
1290 | return true; | |
1291 | ||
1292 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ | |
1293 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1294 | return false; | |
1295 | ||
1296 | /* In all other cases update */ | |
1297 | return true; | |
1298 | } | |
1299 | ||
befc649c | 1300 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
1301 | { |
1302 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1303 | |
1304 | if (ivalid & ATTR_MODE) | |
befc649c | 1305 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1306 | if (ivalid & ATTR_UID) |
befc649c | 1307 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 1308 | if (ivalid & ATTR_GID) |
befc649c | 1309 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 1310 | if (ivalid & ATTR_SIZE) |
befc649c | 1311 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1312 | if (ivalid & ATTR_ATIME) { |
1313 | arg->valid |= FATTR_ATIME; | |
befc649c | 1314 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1315 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1316 | if (!(ivalid & ATTR_ATIME_SET)) | |
1317 | arg->valid |= FATTR_ATIME_NOW; | |
1318 | } | |
1319 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) { | |
1320 | arg->valid |= FATTR_MTIME; | |
befc649c | 1321 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba MS |
1322 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
1323 | if (!(ivalid & ATTR_MTIME_SET)) | |
1324 | arg->valid |= FATTR_MTIME_NOW; | |
befc649c | 1325 | } |
9e6268db MS |
1326 | } |
1327 | ||
3be5a52b MS |
1328 | /* |
1329 | * Prevent concurrent writepages on inode | |
1330 | * | |
1331 | * This is done by adding a negative bias to the inode write counter | |
1332 | * and waiting for all pending writes to finish. | |
1333 | */ | |
1334 | void fuse_set_nowrite(struct inode *inode) | |
1335 | { | |
1336 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1337 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1338 | ||
1339 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1340 | ||
1341 | spin_lock(&fc->lock); | |
1342 | BUG_ON(fi->writectr < 0); | |
1343 | fi->writectr += FUSE_NOWRITE; | |
1344 | spin_unlock(&fc->lock); | |
1345 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1346 | } | |
1347 | ||
1348 | /* | |
1349 | * Allow writepages on inode | |
1350 | * | |
1351 | * Remove the bias from the writecounter and send any queued | |
1352 | * writepages. | |
1353 | */ | |
1354 | static void __fuse_release_nowrite(struct inode *inode) | |
1355 | { | |
1356 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1357 | ||
1358 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1359 | fi->writectr = 0; | |
1360 | fuse_flush_writepages(inode); | |
1361 | } | |
1362 | ||
1363 | void fuse_release_nowrite(struct inode *inode) | |
1364 | { | |
1365 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1366 | ||
1367 | spin_lock(&fc->lock); | |
1368 | __fuse_release_nowrite(inode); | |
1369 | spin_unlock(&fc->lock); | |
1370 | } | |
1371 | ||
6f9f1180 MS |
1372 | /* |
1373 | * Set attributes, and at the same time refresh them. | |
1374 | * | |
1375 | * Truncation is slightly complicated, because the 'truncate' request | |
1376 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1377 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1378 | * and the actual truncation by hand. | |
6f9f1180 | 1379 | */ |
49d4914f MS |
1380 | static int fuse_do_setattr(struct dentry *entry, struct iattr *attr, |
1381 | struct file *file) | |
9e6268db MS |
1382 | { |
1383 | struct inode *inode = entry->d_inode; | |
1384 | struct fuse_conn *fc = get_fuse_conn(inode); | |
9e6268db MS |
1385 | struct fuse_req *req; |
1386 | struct fuse_setattr_in inarg; | |
1387 | struct fuse_attr_out outarg; | |
3be5a52b MS |
1388 | bool is_truncate = false; |
1389 | loff_t oldsize; | |
9e6268db | 1390 | int err; |
9e6268db | 1391 | |
e57ac683 MS |
1392 | if (!fuse_allow_task(fc, current)) |
1393 | return -EACCES; | |
1394 | ||
db78b877 CH |
1395 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1396 | attr->ia_valid |= ATTR_FORCE; | |
1397 | ||
1398 | err = inode_change_ok(inode, attr); | |
1399 | if (err) | |
1400 | return err; | |
1e9a4ed9 | 1401 | |
8d56addd MS |
1402 | if (attr->ia_valid & ATTR_OPEN) { |
1403 | if (fc->atomic_o_trunc) | |
1404 | return 0; | |
1405 | file = NULL; | |
1406 | } | |
6ff958ed | 1407 | |
2c27c65e | 1408 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1409 | is_truncate = true; |
9e6268db | 1410 | |
ce1d5a49 MS |
1411 | req = fuse_get_req(fc); |
1412 | if (IS_ERR(req)) | |
1413 | return PTR_ERR(req); | |
9e6268db | 1414 | |
3be5a52b MS |
1415 | if (is_truncate) |
1416 | fuse_set_nowrite(inode); | |
1417 | ||
9e6268db | 1418 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1419 | memset(&outarg, 0, sizeof(outarg)); |
befc649c | 1420 | iattr_to_fattr(attr, &inarg); |
49d4914f MS |
1421 | if (file) { |
1422 | struct fuse_file *ff = file->private_data; | |
1423 | inarg.valid |= FATTR_FH; | |
1424 | inarg.fh = ff->fh; | |
1425 | } | |
f3332114 MS |
1426 | if (attr->ia_valid & ATTR_SIZE) { |
1427 | /* For mandatory locking in truncate */ | |
1428 | inarg.valid |= FATTR_LOCKOWNER; | |
1429 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1430 | } | |
9e6268db MS |
1431 | req->in.h.opcode = FUSE_SETATTR; |
1432 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1433 | req->in.numargs = 1; |
1434 | req->in.args[0].size = sizeof(inarg); | |
1435 | req->in.args[0].value = &inarg; | |
1436 | req->out.numargs = 1; | |
0e9663ee MS |
1437 | if (fc->minor < 9) |
1438 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1439 | else | |
1440 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 1441 | req->out.args[0].value = &outarg; |
b93f858a | 1442 | fuse_request_send(fc, req); |
9e6268db MS |
1443 | err = req->out.h.error; |
1444 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1445 | if (err) { |
1446 | if (err == -EINTR) | |
1447 | fuse_invalidate_attr(inode); | |
3be5a52b | 1448 | goto error; |
e00d2c2d | 1449 | } |
9e6268db | 1450 | |
e00d2c2d MS |
1451 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1452 | make_bad_inode(inode); | |
3be5a52b MS |
1453 | err = -EIO; |
1454 | goto error; | |
1455 | } | |
1456 | ||
1457 | spin_lock(&fc->lock); | |
1458 | fuse_change_attributes_common(inode, &outarg.attr, | |
1459 | attr_timeout(&outarg)); | |
1460 | oldsize = inode->i_size; | |
1461 | i_size_write(inode, outarg.attr.size); | |
1462 | ||
1463 | if (is_truncate) { | |
1464 | /* NOTE: this may release/reacquire fc->lock */ | |
1465 | __fuse_release_nowrite(inode); | |
1466 | } | |
1467 | spin_unlock(&fc->lock); | |
1468 | ||
1469 | /* | |
1470 | * Only call invalidate_inode_pages2() after removing | |
1471 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1472 | */ | |
1473 | if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
c08d3b0e | 1474 | truncate_pagecache(inode, oldsize, outarg.attr.size); |
3be5a52b | 1475 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1476 | } |
1477 | ||
e00d2c2d | 1478 | return 0; |
3be5a52b MS |
1479 | |
1480 | error: | |
1481 | if (is_truncate) | |
1482 | fuse_release_nowrite(inode); | |
1483 | ||
1484 | return err; | |
9e6268db MS |
1485 | } |
1486 | ||
49d4914f MS |
1487 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1488 | { | |
1489 | if (attr->ia_valid & ATTR_FILE) | |
1490 | return fuse_do_setattr(entry, attr, attr->ia_file); | |
1491 | else | |
1492 | return fuse_do_setattr(entry, attr, NULL); | |
1493 | } | |
1494 | ||
e5e5558e MS |
1495 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1496 | struct kstat *stat) | |
1497 | { | |
1498 | struct inode *inode = entry->d_inode; | |
244f6385 | 1499 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 MS |
1500 | |
1501 | if (!fuse_allow_task(fc, current)) | |
1502 | return -EACCES; | |
1503 | ||
bcb4be80 | 1504 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1505 | } |
1506 | ||
92a8780e MS |
1507 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1508 | const void *value, size_t size, int flags) | |
1509 | { | |
1510 | struct inode *inode = entry->d_inode; | |
1511 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1512 | struct fuse_req *req; | |
1513 | struct fuse_setxattr_in inarg; | |
1514 | int err; | |
1515 | ||
92a8780e MS |
1516 | if (fc->no_setxattr) |
1517 | return -EOPNOTSUPP; | |
1518 | ||
ce1d5a49 MS |
1519 | req = fuse_get_req(fc); |
1520 | if (IS_ERR(req)) | |
1521 | return PTR_ERR(req); | |
92a8780e MS |
1522 | |
1523 | memset(&inarg, 0, sizeof(inarg)); | |
1524 | inarg.size = size; | |
1525 | inarg.flags = flags; | |
1526 | req->in.h.opcode = FUSE_SETXATTR; | |
1527 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1528 | req->in.numargs = 3; |
1529 | req->in.args[0].size = sizeof(inarg); | |
1530 | req->in.args[0].value = &inarg; | |
1531 | req->in.args[1].size = strlen(name) + 1; | |
1532 | req->in.args[1].value = name; | |
1533 | req->in.args[2].size = size; | |
1534 | req->in.args[2].value = value; | |
b93f858a | 1535 | fuse_request_send(fc, req); |
92a8780e MS |
1536 | err = req->out.h.error; |
1537 | fuse_put_request(fc, req); | |
1538 | if (err == -ENOSYS) { | |
1539 | fc->no_setxattr = 1; | |
1540 | err = -EOPNOTSUPP; | |
1541 | } | |
1542 | return err; | |
1543 | } | |
1544 | ||
1545 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1546 | void *value, size_t size) | |
1547 | { | |
1548 | struct inode *inode = entry->d_inode; | |
1549 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1550 | struct fuse_req *req; | |
1551 | struct fuse_getxattr_in inarg; | |
1552 | struct fuse_getxattr_out outarg; | |
1553 | ssize_t ret; | |
1554 | ||
1555 | if (fc->no_getxattr) | |
1556 | return -EOPNOTSUPP; | |
1557 | ||
ce1d5a49 MS |
1558 | req = fuse_get_req(fc); |
1559 | if (IS_ERR(req)) | |
1560 | return PTR_ERR(req); | |
92a8780e MS |
1561 | |
1562 | memset(&inarg, 0, sizeof(inarg)); | |
1563 | inarg.size = size; | |
1564 | req->in.h.opcode = FUSE_GETXATTR; | |
1565 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1566 | req->in.numargs = 2; |
1567 | req->in.args[0].size = sizeof(inarg); | |
1568 | req->in.args[0].value = &inarg; | |
1569 | req->in.args[1].size = strlen(name) + 1; | |
1570 | req->in.args[1].value = name; | |
1571 | /* This is really two different operations rolled into one */ | |
1572 | req->out.numargs = 1; | |
1573 | if (size) { | |
1574 | req->out.argvar = 1; | |
1575 | req->out.args[0].size = size; | |
1576 | req->out.args[0].value = value; | |
1577 | } else { | |
1578 | req->out.args[0].size = sizeof(outarg); | |
1579 | req->out.args[0].value = &outarg; | |
1580 | } | |
b93f858a | 1581 | fuse_request_send(fc, req); |
92a8780e MS |
1582 | ret = req->out.h.error; |
1583 | if (!ret) | |
1584 | ret = size ? req->out.args[0].size : outarg.size; | |
1585 | else { | |
1586 | if (ret == -ENOSYS) { | |
1587 | fc->no_getxattr = 1; | |
1588 | ret = -EOPNOTSUPP; | |
1589 | } | |
1590 | } | |
1591 | fuse_put_request(fc, req); | |
1592 | return ret; | |
1593 | } | |
1594 | ||
1595 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1596 | { | |
1597 | struct inode *inode = entry->d_inode; | |
1598 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1599 | struct fuse_req *req; | |
1600 | struct fuse_getxattr_in inarg; | |
1601 | struct fuse_getxattr_out outarg; | |
1602 | ssize_t ret; | |
1603 | ||
e57ac683 MS |
1604 | if (!fuse_allow_task(fc, current)) |
1605 | return -EACCES; | |
1606 | ||
92a8780e MS |
1607 | if (fc->no_listxattr) |
1608 | return -EOPNOTSUPP; | |
1609 | ||
ce1d5a49 MS |
1610 | req = fuse_get_req(fc); |
1611 | if (IS_ERR(req)) | |
1612 | return PTR_ERR(req); | |
92a8780e MS |
1613 | |
1614 | memset(&inarg, 0, sizeof(inarg)); | |
1615 | inarg.size = size; | |
1616 | req->in.h.opcode = FUSE_LISTXATTR; | |
1617 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1618 | req->in.numargs = 1; |
1619 | req->in.args[0].size = sizeof(inarg); | |
1620 | req->in.args[0].value = &inarg; | |
1621 | /* This is really two different operations rolled into one */ | |
1622 | req->out.numargs = 1; | |
1623 | if (size) { | |
1624 | req->out.argvar = 1; | |
1625 | req->out.args[0].size = size; | |
1626 | req->out.args[0].value = list; | |
1627 | } else { | |
1628 | req->out.args[0].size = sizeof(outarg); | |
1629 | req->out.args[0].value = &outarg; | |
1630 | } | |
b93f858a | 1631 | fuse_request_send(fc, req); |
92a8780e MS |
1632 | ret = req->out.h.error; |
1633 | if (!ret) | |
1634 | ret = size ? req->out.args[0].size : outarg.size; | |
1635 | else { | |
1636 | if (ret == -ENOSYS) { | |
1637 | fc->no_listxattr = 1; | |
1638 | ret = -EOPNOTSUPP; | |
1639 | } | |
1640 | } | |
1641 | fuse_put_request(fc, req); | |
1642 | return ret; | |
1643 | } | |
1644 | ||
1645 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1646 | { | |
1647 | struct inode *inode = entry->d_inode; | |
1648 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1649 | struct fuse_req *req; | |
1650 | int err; | |
1651 | ||
1652 | if (fc->no_removexattr) | |
1653 | return -EOPNOTSUPP; | |
1654 | ||
ce1d5a49 MS |
1655 | req = fuse_get_req(fc); |
1656 | if (IS_ERR(req)) | |
1657 | return PTR_ERR(req); | |
92a8780e MS |
1658 | |
1659 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1660 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1661 | req->in.numargs = 1; |
1662 | req->in.args[0].size = strlen(name) + 1; | |
1663 | req->in.args[0].value = name; | |
b93f858a | 1664 | fuse_request_send(fc, req); |
92a8780e MS |
1665 | err = req->out.h.error; |
1666 | fuse_put_request(fc, req); | |
1667 | if (err == -ENOSYS) { | |
1668 | fc->no_removexattr = 1; | |
1669 | err = -EOPNOTSUPP; | |
1670 | } | |
1671 | return err; | |
1672 | } | |
1673 | ||
754661f1 | 1674 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1675 | .lookup = fuse_lookup, |
9e6268db MS |
1676 | .mkdir = fuse_mkdir, |
1677 | .symlink = fuse_symlink, | |
1678 | .unlink = fuse_unlink, | |
1679 | .rmdir = fuse_rmdir, | |
1680 | .rename = fuse_rename, | |
1681 | .link = fuse_link, | |
1682 | .setattr = fuse_setattr, | |
1683 | .create = fuse_create, | |
c8ccbe03 | 1684 | .atomic_open = fuse_atomic_open, |
9e6268db | 1685 | .mknod = fuse_mknod, |
e5e5558e MS |
1686 | .permission = fuse_permission, |
1687 | .getattr = fuse_getattr, | |
92a8780e MS |
1688 | .setxattr = fuse_setxattr, |
1689 | .getxattr = fuse_getxattr, | |
1690 | .listxattr = fuse_listxattr, | |
1691 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1692 | }; |
1693 | ||
4b6f5d20 | 1694 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1695 | .llseek = generic_file_llseek, |
e5e5558e MS |
1696 | .read = generic_read_dir, |
1697 | .readdir = fuse_readdir, | |
1698 | .open = fuse_dir_open, | |
1699 | .release = fuse_dir_release, | |
82547981 | 1700 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1701 | .unlocked_ioctl = fuse_dir_ioctl, |
1702 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1703 | }; |
1704 | ||
754661f1 | 1705 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1706 | .setattr = fuse_setattr, |
e5e5558e MS |
1707 | .permission = fuse_permission, |
1708 | .getattr = fuse_getattr, | |
92a8780e MS |
1709 | .setxattr = fuse_setxattr, |
1710 | .getxattr = fuse_getxattr, | |
1711 | .listxattr = fuse_listxattr, | |
1712 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1713 | }; |
1714 | ||
754661f1 | 1715 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1716 | .setattr = fuse_setattr, |
e5e5558e MS |
1717 | .follow_link = fuse_follow_link, |
1718 | .put_link = fuse_put_link, | |
1719 | .readlink = generic_readlink, | |
1720 | .getattr = fuse_getattr, | |
92a8780e MS |
1721 | .setxattr = fuse_setxattr, |
1722 | .getxattr = fuse_getxattr, | |
1723 | .listxattr = fuse_listxattr, | |
1724 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1725 | }; |
1726 | ||
1727 | void fuse_init_common(struct inode *inode) | |
1728 | { | |
1729 | inode->i_op = &fuse_common_inode_operations; | |
1730 | } | |
1731 | ||
1732 | void fuse_init_dir(struct inode *inode) | |
1733 | { | |
1734 | inode->i_op = &fuse_dir_inode_operations; | |
1735 | inode->i_fop = &fuse_dir_operations; | |
1736 | } | |
1737 | ||
1738 | void fuse_init_symlink(struct inode *inode) | |
1739 | { | |
1740 | inode->i_op = &fuse_symlink_inode_operations; | |
1741 | } |