Commit | Line | Data |
---|---|---|
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 | |
8d3af7f3 | 17 | static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
4582a4ab FS |
18 | { |
19 | struct fuse_conn *fc = get_fuse_conn(dir); | |
20 | struct fuse_inode *fi = get_fuse_inode(dir); | |
21 | ||
22 | if (!fc->do_readdirplus) | |
23 | return false; | |
634734b6 EW |
24 | if (!fc->readdirplus_auto) |
25 | return true; | |
4582a4ab FS |
26 | if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state)) |
27 | return true; | |
8d3af7f3 | 28 | if (ctx->pos == 0) |
4582a4ab FS |
29 | return true; |
30 | return false; | |
31 | } | |
32 | ||
33 | static void fuse_advise_use_readdirplus(struct inode *dir) | |
34 | { | |
35 | struct fuse_inode *fi = get_fuse_inode(dir); | |
36 | ||
37 | set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state); | |
38 | } | |
39 | ||
0a0898cf MS |
40 | #if BITS_PER_LONG >= 64 |
41 | static inline void fuse_dentry_settime(struct dentry *entry, u64 time) | |
42 | { | |
43 | entry->d_time = time; | |
44 | } | |
45 | ||
46 | static inline u64 fuse_dentry_time(struct dentry *entry) | |
47 | { | |
48 | return entry->d_time; | |
49 | } | |
50 | #else | |
51 | /* | |
52 | * On 32 bit archs store the high 32 bits of time in d_fsdata | |
53 | */ | |
54 | static void fuse_dentry_settime(struct dentry *entry, u64 time) | |
55 | { | |
56 | entry->d_time = time; | |
57 | entry->d_fsdata = (void *) (unsigned long) (time >> 32); | |
58 | } | |
59 | ||
60 | static u64 fuse_dentry_time(struct dentry *entry) | |
61 | { | |
62 | return (u64) entry->d_time + | |
63 | ((u64) (unsigned long) entry->d_fsdata << 32); | |
64 | } | |
65 | #endif | |
66 | ||
6f9f1180 MS |
67 | /* |
68 | * FUSE caches dentries and attributes with separate timeout. The | |
69 | * time in jiffies until the dentry/attributes are valid is stored in | |
70 | * dentry->d_time and fuse_inode->i_time respectively. | |
71 | */ | |
72 | ||
73 | /* | |
74 | * Calculate the time in jiffies until a dentry/attributes are valid | |
75 | */ | |
0a0898cf | 76 | static u64 time_to_jiffies(unsigned long sec, unsigned long nsec) |
e5e5558e | 77 | { |
685d16dd MS |
78 | if (sec || nsec) { |
79 | struct timespec ts = {sec, nsec}; | |
0a0898cf | 80 | return get_jiffies_64() + timespec_to_jiffies(&ts); |
685d16dd | 81 | } else |
0a0898cf | 82 | return 0; |
e5e5558e MS |
83 | } |
84 | ||
6f9f1180 MS |
85 | /* |
86 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
87 | * replies | |
88 | */ | |
1fb69e78 MS |
89 | static void fuse_change_entry_timeout(struct dentry *entry, |
90 | struct fuse_entry_out *o) | |
0aa7c699 | 91 | { |
0a0898cf MS |
92 | fuse_dentry_settime(entry, |
93 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
1fb69e78 MS |
94 | } |
95 | ||
96 | static u64 attr_timeout(struct fuse_attr_out *o) | |
97 | { | |
98 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
99 | } | |
100 | ||
101 | static u64 entry_attr_timeout(struct fuse_entry_out *o) | |
102 | { | |
103 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
8cbdf1e6 MS |
104 | } |
105 | ||
6f9f1180 MS |
106 | /* |
107 | * Mark the attributes as stale, so that at the next call to | |
108 | * ->getattr() they will be fetched from userspace | |
109 | */ | |
8cbdf1e6 MS |
110 | void fuse_invalidate_attr(struct inode *inode) |
111 | { | |
0a0898cf | 112 | get_fuse_inode(inode)->i_time = 0; |
8cbdf1e6 MS |
113 | } |
114 | ||
451418fc AG |
115 | /** |
116 | * Mark the attributes as stale due to an atime change. Avoid the invalidate if | |
117 | * atime is not used. | |
118 | */ | |
119 | void fuse_invalidate_atime(struct inode *inode) | |
120 | { | |
121 | if (!IS_RDONLY(inode)) | |
122 | fuse_invalidate_attr(inode); | |
123 | } | |
124 | ||
6f9f1180 MS |
125 | /* |
126 | * Just mark the entry as stale, so that a next attempt to look it up | |
127 | * will result in a new lookup call to userspace | |
128 | * | |
129 | * This is called when a dentry is about to become negative and the | |
130 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
131 | * lookup) | |
132 | */ | |
dbd561d2 | 133 | void fuse_invalidate_entry_cache(struct dentry *entry) |
8cbdf1e6 | 134 | { |
0a0898cf | 135 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
136 | } |
137 | ||
6f9f1180 MS |
138 | /* |
139 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
140 | * dentry from the hash | |
141 | */ | |
8cbdf1e6 MS |
142 | static void fuse_invalidate_entry(struct dentry *entry) |
143 | { | |
144 | d_invalidate(entry); | |
145 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
146 | } |
147 | ||
7078187a | 148 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, |
c180eebe | 149 | u64 nodeid, struct qstr *name, |
e5e5558e MS |
150 | struct fuse_entry_out *outarg) |
151 | { | |
0e9663ee | 152 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
7078187a MS |
153 | args->in.h.opcode = FUSE_LOOKUP; |
154 | args->in.h.nodeid = nodeid; | |
155 | args->in.numargs = 1; | |
156 | args->in.args[0].size = name->len + 1; | |
157 | args->in.args[0].value = name->name; | |
158 | args->out.numargs = 1; | |
0e9663ee | 159 | if (fc->minor < 9) |
7078187a | 160 | args->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; |
0e9663ee | 161 | else |
7078187a MS |
162 | args->out.args[0].size = sizeof(struct fuse_entry_out); |
163 | args->out.args[0].value = outarg; | |
e5e5558e MS |
164 | } |
165 | ||
5c5c5e51 | 166 | u64 fuse_get_attr_version(struct fuse_conn *fc) |
7dca9fd3 MS |
167 | { |
168 | u64 curr_version; | |
169 | ||
170 | /* | |
171 | * The spin lock isn't actually needed on 64bit archs, but we | |
172 | * don't yet care too much about such optimizations. | |
173 | */ | |
174 | spin_lock(&fc->lock); | |
175 | curr_version = fc->attr_version; | |
176 | spin_unlock(&fc->lock); | |
177 | ||
178 | return curr_version; | |
179 | } | |
180 | ||
6f9f1180 MS |
181 | /* |
182 | * Check whether the dentry is still valid | |
183 | * | |
184 | * If the entry validity timeout has expired and the dentry is | |
185 | * positive, try to redo the lookup. If the lookup results in a | |
186 | * different inode, then let the VFS invalidate the dentry and redo | |
187 | * the lookup once more. If the lookup results in the same inode, | |
188 | * then refresh the attributes, timeouts and mark the dentry valid. | |
189 | */ | |
0b728e19 | 190 | static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) |
e5e5558e | 191 | { |
34286d66 | 192 | struct inode *inode; |
28420dad MS |
193 | struct dentry *parent; |
194 | struct fuse_conn *fc; | |
6314efee | 195 | struct fuse_inode *fi; |
e2a6b952 | 196 | int ret; |
8cbdf1e6 | 197 | |
e7c0a167 | 198 | inode = ACCESS_ONCE(entry->d_inode); |
8cbdf1e6 | 199 | if (inode && is_bad_inode(inode)) |
e2a6b952 | 200 | goto invalid; |
154210cc AA |
201 | else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) || |
202 | (flags & LOOKUP_REVAL)) { | |
e5e5558e | 203 | struct fuse_entry_out outarg; |
7078187a | 204 | FUSE_ARGS(args); |
07e77dca | 205 | struct fuse_forget_link *forget; |
1fb69e78 | 206 | u64 attr_version; |
8cbdf1e6 | 207 | |
50322fe7 | 208 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 | 209 | if (!inode) |
e2a6b952 | 210 | goto invalid; |
8cbdf1e6 | 211 | |
e2a6b952 | 212 | ret = -ECHILD; |
0b728e19 | 213 | if (flags & LOOKUP_RCU) |
e2a6b952 | 214 | goto out; |
e7c0a167 | 215 | |
8cbdf1e6 | 216 | fc = get_fuse_conn(inode); |
e5e5558e | 217 | |
07e77dca | 218 | forget = fuse_alloc_forget(); |
7078187a MS |
219 | ret = -ENOMEM; |
220 | if (!forget) | |
e2a6b952 | 221 | goto out; |
2d51013e | 222 | |
7dca9fd3 | 223 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 224 | |
e956edd0 | 225 | parent = dget_parent(entry); |
7078187a | 226 | fuse_lookup_init(fc, &args, get_node_id(parent->d_inode), |
c180eebe | 227 | &entry->d_name, &outarg); |
7078187a | 228 | ret = fuse_simple_request(fc, &args); |
e956edd0 | 229 | dput(parent); |
50322fe7 | 230 | /* Zero nodeid is same as -ENOENT */ |
7078187a MS |
231 | if (!ret && !outarg.nodeid) |
232 | ret = -ENOENT; | |
233 | if (!ret) { | |
6314efee | 234 | fi = get_fuse_inode(inode); |
9e6268db | 235 | if (outarg.nodeid != get_node_id(inode)) { |
07e77dca | 236 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
e2a6b952 | 237 | goto invalid; |
9e6268db | 238 | } |
8da5ff23 | 239 | spin_lock(&fc->lock); |
1729a16c | 240 | fi->nlookup++; |
8da5ff23 | 241 | spin_unlock(&fc->lock); |
9e6268db | 242 | } |
07e77dca | 243 | kfree(forget); |
7078187a MS |
244 | if (ret == -ENOMEM) |
245 | goto out; | |
246 | if (ret || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) | |
e2a6b952 | 247 | goto invalid; |
e5e5558e | 248 | |
1fb69e78 MS |
249 | fuse_change_attributes(inode, &outarg.attr, |
250 | entry_attr_timeout(&outarg), | |
251 | attr_version); | |
252 | fuse_change_entry_timeout(entry, &outarg); | |
28420dad | 253 | } else if (inode) { |
6314efee MS |
254 | fi = get_fuse_inode(inode); |
255 | if (flags & LOOKUP_RCU) { | |
256 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) | |
257 | return -ECHILD; | |
258 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { | |
28420dad MS |
259 | parent = dget_parent(entry); |
260 | fuse_advise_use_readdirplus(parent->d_inode); | |
261 | dput(parent); | |
262 | } | |
e5e5558e | 263 | } |
e2a6b952 MS |
264 | ret = 1; |
265 | out: | |
266 | return ret; | |
267 | ||
268 | invalid: | |
269 | ret = 0; | |
270 | goto out; | |
e5e5558e MS |
271 | } |
272 | ||
8bfc016d | 273 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
274 | { |
275 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
276 | } | |
277 | ||
4269590a | 278 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e MS |
279 | .d_revalidate = fuse_dentry_revalidate, |
280 | }; | |
281 | ||
a5bfffac | 282 | int fuse_valid_type(int m) |
39ee059a MS |
283 | { |
284 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
285 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
286 | } | |
287 | ||
c180eebe MS |
288 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, |
289 | struct fuse_entry_out *outarg, struct inode **inode) | |
e5e5558e | 290 | { |
c180eebe | 291 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 292 | FUSE_ARGS(args); |
07e77dca | 293 | struct fuse_forget_link *forget; |
1fb69e78 | 294 | u64 attr_version; |
c180eebe | 295 | int err; |
e5e5558e | 296 | |
c180eebe MS |
297 | *inode = NULL; |
298 | err = -ENAMETOOLONG; | |
299 | if (name->len > FUSE_NAME_MAX) | |
300 | goto out; | |
e5e5558e | 301 | |
e5e5558e | 302 | |
07e77dca MS |
303 | forget = fuse_alloc_forget(); |
304 | err = -ENOMEM; | |
7078187a | 305 | if (!forget) |
c180eebe | 306 | goto out; |
2d51013e | 307 | |
7dca9fd3 | 308 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 309 | |
7078187a MS |
310 | fuse_lookup_init(fc, &args, nodeid, name, outarg); |
311 | err = fuse_simple_request(fc, &args); | |
50322fe7 | 312 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
313 | if (err || !outarg->nodeid) |
314 | goto out_put_forget; | |
315 | ||
316 | err = -EIO; | |
317 | if (!outarg->nodeid) | |
318 | goto out_put_forget; | |
319 | if (!fuse_valid_type(outarg->attr.mode)) | |
320 | goto out_put_forget; | |
321 | ||
322 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
323 | &outarg->attr, entry_attr_timeout(outarg), | |
324 | attr_version); | |
325 | err = -ENOMEM; | |
326 | if (!*inode) { | |
07e77dca | 327 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
c180eebe | 328 | goto out; |
e5e5558e | 329 | } |
c180eebe MS |
330 | err = 0; |
331 | ||
332 | out_put_forget: | |
07e77dca | 333 | kfree(forget); |
c180eebe MS |
334 | out: |
335 | return err; | |
336 | } | |
337 | ||
338 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 339 | unsigned int flags) |
c180eebe MS |
340 | { |
341 | int err; | |
342 | struct fuse_entry_out outarg; | |
343 | struct inode *inode; | |
344 | struct dentry *newent; | |
c180eebe MS |
345 | bool outarg_valid = true; |
346 | ||
347 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, | |
348 | &outarg, &inode); | |
349 | if (err == -ENOENT) { | |
350 | outarg_valid = false; | |
351 | err = 0; | |
352 | } | |
353 | if (err) | |
354 | goto out_err; | |
355 | ||
356 | err = -EIO; | |
357 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
358 | goto out_iput; | |
e5e5558e | 359 | |
41d28bca | 360 | newent = d_splice_alias(inode, entry); |
5835f339 MS |
361 | err = PTR_ERR(newent); |
362 | if (IS_ERR(newent)) | |
363 | goto out_err; | |
d2a85164 | 364 | |
0de6256d | 365 | entry = newent ? newent : entry; |
c180eebe | 366 | if (outarg_valid) |
1fb69e78 | 367 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
368 | else |
369 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 370 | |
4582a4ab | 371 | fuse_advise_use_readdirplus(dir); |
0de6256d | 372 | return newent; |
c180eebe MS |
373 | |
374 | out_iput: | |
375 | iput(inode); | |
376 | out_err: | |
377 | return ERR_PTR(err); | |
e5e5558e MS |
378 | } |
379 | ||
6f9f1180 MS |
380 | /* |
381 | * Atomic create+open operation | |
382 | * | |
383 | * If the filesystem doesn't support this, then fall back to separate | |
384 | * 'mknod' + 'open' requests. | |
385 | */ | |
d9585277 | 386 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 387 | struct file *file, unsigned flags, |
d9585277 | 388 | umode_t mode, int *opened) |
fd72faac MS |
389 | { |
390 | int err; | |
391 | struct inode *inode; | |
392 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 393 | FUSE_ARGS(args); |
07e77dca | 394 | struct fuse_forget_link *forget; |
e0a43ddc | 395 | struct fuse_create_in inarg; |
fd72faac MS |
396 | struct fuse_open_out outopen; |
397 | struct fuse_entry_out outentry; | |
fd72faac | 398 | struct fuse_file *ff; |
fd72faac | 399 | |
af109bca MS |
400 | /* Userspace expects S_IFREG in create mode */ |
401 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
402 | ||
07e77dca | 403 | forget = fuse_alloc_forget(); |
c8ccbe03 | 404 | err = -ENOMEM; |
07e77dca | 405 | if (!forget) |
c8ccbe03 | 406 | goto out_err; |
51eb01e7 | 407 | |
ce1d5a49 | 408 | err = -ENOMEM; |
acf99433 | 409 | ff = fuse_file_alloc(fc); |
fd72faac | 410 | if (!ff) |
7078187a | 411 | goto out_put_forget_req; |
fd72faac | 412 | |
e0a43ddc MS |
413 | if (!fc->dont_mask) |
414 | mode &= ~current_umask(); | |
415 | ||
fd72faac MS |
416 | flags &= ~O_NOCTTY; |
417 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 418 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
419 | inarg.flags = flags; |
420 | inarg.mode = mode; | |
e0a43ddc | 421 | inarg.umask = current_umask(); |
7078187a MS |
422 | args.in.h.opcode = FUSE_CREATE; |
423 | args.in.h.nodeid = get_node_id(dir); | |
424 | args.in.numargs = 2; | |
425 | args.in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : | |
e0a43ddc | 426 | sizeof(inarg); |
7078187a MS |
427 | args.in.args[0].value = &inarg; |
428 | args.in.args[1].size = entry->d_name.len + 1; | |
429 | args.in.args[1].value = entry->d_name.name; | |
430 | args.out.numargs = 2; | |
0e9663ee | 431 | if (fc->minor < 9) |
7078187a | 432 | args.out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; |
0e9663ee | 433 | else |
7078187a MS |
434 | args.out.args[0].size = sizeof(outentry); |
435 | args.out.args[0].value = &outentry; | |
436 | args.out.args[1].size = sizeof(outopen); | |
437 | args.out.args[1].value = &outopen; | |
438 | err = fuse_simple_request(fc, &args); | |
c8ccbe03 | 439 | if (err) |
fd72faac | 440 | goto out_free_ff; |
fd72faac MS |
441 | |
442 | err = -EIO; | |
2827d0b2 | 443 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
444 | goto out_free_ff; |
445 | ||
c7b7143c MS |
446 | ff->fh = outopen.fh; |
447 | ff->nodeid = outentry.nodeid; | |
448 | ff->open_flags = outopen.open_flags; | |
fd72faac | 449 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 450 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
451 | if (!inode) { |
452 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 453 | fuse_sync_release(ff, flags); |
07e77dca | 454 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
455 | err = -ENOMEM; |
456 | goto out_err; | |
fd72faac | 457 | } |
07e77dca | 458 | kfree(forget); |
fd72faac | 459 | d_instantiate(entry, inode); |
1fb69e78 | 460 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 461 | fuse_invalidate_attr(dir); |
30d90494 AV |
462 | err = finish_open(file, entry, generic_file_open, opened); |
463 | if (err) { | |
8b0797a4 | 464 | fuse_sync_release(ff, flags); |
c8ccbe03 MS |
465 | } else { |
466 | file->private_data = fuse_file_get(ff); | |
467 | fuse_finish_open(inode, file); | |
fd72faac | 468 | } |
d9585277 | 469 | return err; |
fd72faac | 470 | |
c8ccbe03 | 471 | out_free_ff: |
fd72faac | 472 | fuse_file_free(ff); |
c8ccbe03 | 473 | out_put_forget_req: |
07e77dca | 474 | kfree(forget); |
c8ccbe03 | 475 | out_err: |
d9585277 | 476 | return err; |
c8ccbe03 MS |
477 | } |
478 | ||
479 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 480 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 481 | struct file *file, unsigned flags, |
d9585277 | 482 | umode_t mode, int *opened) |
c8ccbe03 MS |
483 | { |
484 | int err; | |
485 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
486 | struct dentry *res = NULL; |
487 | ||
488 | if (d_unhashed(entry)) { | |
00cd8dd3 | 489 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 490 | if (IS_ERR(res)) |
d9585277 | 491 | return PTR_ERR(res); |
c8ccbe03 MS |
492 | |
493 | if (res) | |
494 | entry = res; | |
495 | } | |
496 | ||
497 | if (!(flags & O_CREAT) || entry->d_inode) | |
498 | goto no_open; | |
499 | ||
500 | /* Only creates */ | |
47237687 | 501 | *opened |= FILE_CREATED; |
c8ccbe03 MS |
502 | |
503 | if (fc->no_create) | |
504 | goto mknod; | |
505 | ||
30d90494 | 506 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
d9585277 | 507 | if (err == -ENOSYS) { |
c8ccbe03 MS |
508 | fc->no_create = 1; |
509 | goto mknod; | |
510 | } | |
511 | out_dput: | |
512 | dput(res); | |
d9585277 | 513 | return err; |
c8ccbe03 MS |
514 | |
515 | mknod: | |
516 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 517 | if (err) |
c8ccbe03 | 518 | goto out_dput; |
c8ccbe03 | 519 | no_open: |
e45198a6 | 520 | return finish_no_open(file, res); |
fd72faac MS |
521 | } |
522 | ||
6f9f1180 MS |
523 | /* |
524 | * Code shared between mknod, mkdir, symlink and link | |
525 | */ | |
7078187a | 526 | static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args, |
9e6268db | 527 | struct inode *dir, struct dentry *entry, |
541af6a0 | 528 | umode_t mode) |
9e6268db MS |
529 | { |
530 | struct fuse_entry_out outarg; | |
531 | struct inode *inode; | |
9e6268db | 532 | int err; |
07e77dca | 533 | struct fuse_forget_link *forget; |
2d51013e | 534 | |
07e77dca | 535 | forget = fuse_alloc_forget(); |
7078187a | 536 | if (!forget) |
07e77dca | 537 | return -ENOMEM; |
9e6268db | 538 | |
0e9663ee | 539 | memset(&outarg, 0, sizeof(outarg)); |
7078187a MS |
540 | args->in.h.nodeid = get_node_id(dir); |
541 | args->out.numargs = 1; | |
0e9663ee | 542 | if (fc->minor < 9) |
7078187a | 543 | args->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; |
0e9663ee | 544 | else |
7078187a MS |
545 | args->out.args[0].size = sizeof(outarg); |
546 | args->out.args[0].value = &outarg; | |
547 | err = fuse_simple_request(fc, args); | |
2d51013e MS |
548 | if (err) |
549 | goto out_put_forget_req; | |
550 | ||
39ee059a MS |
551 | err = -EIO; |
552 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 553 | goto out_put_forget_req; |
39ee059a MS |
554 | |
555 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 556 | goto out_put_forget_req; |
39ee059a | 557 | |
9e6268db | 558 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 559 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 560 | if (!inode) { |
07e77dca | 561 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
562 | return -ENOMEM; |
563 | } | |
07e77dca | 564 | kfree(forget); |
9e6268db | 565 | |
b70a80e7 MS |
566 | err = d_instantiate_no_diralias(entry, inode); |
567 | if (err) | |
568 | return err; | |
9e6268db | 569 | |
1fb69e78 | 570 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
571 | fuse_invalidate_attr(dir); |
572 | return 0; | |
39ee059a | 573 | |
2d51013e | 574 | out_put_forget_req: |
07e77dca | 575 | kfree(forget); |
39ee059a | 576 | return err; |
9e6268db MS |
577 | } |
578 | ||
1a67aafb | 579 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
580 | dev_t rdev) |
581 | { | |
582 | struct fuse_mknod_in inarg; | |
583 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 584 | FUSE_ARGS(args); |
9e6268db | 585 | |
e0a43ddc MS |
586 | if (!fc->dont_mask) |
587 | mode &= ~current_umask(); | |
588 | ||
9e6268db MS |
589 | memset(&inarg, 0, sizeof(inarg)); |
590 | inarg.mode = mode; | |
591 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 592 | inarg.umask = current_umask(); |
7078187a MS |
593 | args.in.h.opcode = FUSE_MKNOD; |
594 | args.in.numargs = 2; | |
595 | args.in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : | |
e0a43ddc | 596 | sizeof(inarg); |
7078187a MS |
597 | args.in.args[0].value = &inarg; |
598 | args.in.args[1].size = entry->d_name.len + 1; | |
599 | args.in.args[1].value = entry->d_name.name; | |
600 | return create_new_entry(fc, &args, dir, entry, mode); | |
9e6268db MS |
601 | } |
602 | ||
4acdaf27 | 603 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
ebfc3b49 | 604 | bool excl) |
9e6268db MS |
605 | { |
606 | return fuse_mknod(dir, entry, mode, 0); | |
607 | } | |
608 | ||
18bb1db3 | 609 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
610 | { |
611 | struct fuse_mkdir_in inarg; | |
612 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 613 | FUSE_ARGS(args); |
9e6268db | 614 | |
e0a43ddc MS |
615 | if (!fc->dont_mask) |
616 | mode &= ~current_umask(); | |
617 | ||
9e6268db MS |
618 | memset(&inarg, 0, sizeof(inarg)); |
619 | inarg.mode = mode; | |
e0a43ddc | 620 | inarg.umask = current_umask(); |
7078187a MS |
621 | args.in.h.opcode = FUSE_MKDIR; |
622 | args.in.numargs = 2; | |
623 | args.in.args[0].size = sizeof(inarg); | |
624 | args.in.args[0].value = &inarg; | |
625 | args.in.args[1].size = entry->d_name.len + 1; | |
626 | args.in.args[1].value = entry->d_name.name; | |
627 | return create_new_entry(fc, &args, dir, entry, S_IFDIR); | |
9e6268db MS |
628 | } |
629 | ||
630 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
631 | const char *link) | |
632 | { | |
633 | struct fuse_conn *fc = get_fuse_conn(dir); | |
634 | unsigned len = strlen(link) + 1; | |
7078187a | 635 | FUSE_ARGS(args); |
9e6268db | 636 | |
7078187a MS |
637 | args.in.h.opcode = FUSE_SYMLINK; |
638 | args.in.numargs = 2; | |
639 | args.in.args[0].size = entry->d_name.len + 1; | |
640 | args.in.args[0].value = entry->d_name.name; | |
641 | args.in.args[1].size = len; | |
642 | args.in.args[1].value = link; | |
643 | return create_new_entry(fc, &args, dir, entry, S_IFLNK); | |
9e6268db MS |
644 | } |
645 | ||
31f3267b MP |
646 | static inline void fuse_update_ctime(struct inode *inode) |
647 | { | |
648 | if (!IS_NOCMTIME(inode)) { | |
649 | inode->i_ctime = current_fs_time(inode->i_sb); | |
650 | mark_inode_dirty_sync(inode); | |
651 | } | |
652 | } | |
653 | ||
9e6268db MS |
654 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
655 | { | |
656 | int err; | |
657 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a MS |
658 | FUSE_ARGS(args); |
659 | ||
660 | args.in.h.opcode = FUSE_UNLINK; | |
661 | args.in.h.nodeid = get_node_id(dir); | |
662 | args.in.numargs = 1; | |
663 | args.in.args[0].size = entry->d_name.len + 1; | |
664 | args.in.args[0].value = entry->d_name.name; | |
665 | err = fuse_simple_request(fc, &args); | |
9e6268db MS |
666 | if (!err) { |
667 | struct inode *inode = entry->d_inode; | |
ac45d613 | 668 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 669 | |
ac45d613 MS |
670 | spin_lock(&fc->lock); |
671 | fi->attr_version = ++fc->attr_version; | |
dfca7ceb MS |
672 | /* |
673 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
674 | * happen if userspace filesystem is careless. It would be | |
675 | * difficult to enforce correct nlink usage so just ignore this | |
676 | * condition here | |
677 | */ | |
678 | if (inode->i_nlink > 0) | |
679 | drop_nlink(inode); | |
ac45d613 | 680 | spin_unlock(&fc->lock); |
9e6268db MS |
681 | fuse_invalidate_attr(inode); |
682 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 683 | fuse_invalidate_entry_cache(entry); |
31f3267b | 684 | fuse_update_ctime(inode); |
9e6268db MS |
685 | } else if (err == -EINTR) |
686 | fuse_invalidate_entry(entry); | |
687 | return err; | |
688 | } | |
689 | ||
690 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
691 | { | |
692 | int err; | |
693 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a MS |
694 | FUSE_ARGS(args); |
695 | ||
696 | args.in.h.opcode = FUSE_RMDIR; | |
697 | args.in.h.nodeid = get_node_id(dir); | |
698 | args.in.numargs = 1; | |
699 | args.in.args[0].size = entry->d_name.len + 1; | |
700 | args.in.args[0].value = entry->d_name.name; | |
701 | err = fuse_simple_request(fc, &args); | |
9e6268db | 702 | if (!err) { |
ce71ec36 | 703 | clear_nlink(entry->d_inode); |
9e6268db | 704 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 705 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
706 | } else if (err == -EINTR) |
707 | fuse_invalidate_entry(entry); | |
708 | return err; | |
709 | } | |
710 | ||
1560c974 MS |
711 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
712 | struct inode *newdir, struct dentry *newent, | |
713 | unsigned int flags, int opcode, size_t argsize) | |
9e6268db MS |
714 | { |
715 | int err; | |
1560c974 | 716 | struct fuse_rename2_in inarg; |
9e6268db | 717 | struct fuse_conn *fc = get_fuse_conn(olddir); |
7078187a | 718 | FUSE_ARGS(args); |
9e6268db | 719 | |
1560c974 | 720 | memset(&inarg, 0, argsize); |
9e6268db | 721 | inarg.newdir = get_node_id(newdir); |
1560c974 | 722 | inarg.flags = flags; |
7078187a MS |
723 | args.in.h.opcode = opcode; |
724 | args.in.h.nodeid = get_node_id(olddir); | |
725 | args.in.numargs = 3; | |
726 | args.in.args[0].size = argsize; | |
727 | args.in.args[0].value = &inarg; | |
728 | args.in.args[1].size = oldent->d_name.len + 1; | |
729 | args.in.args[1].value = oldent->d_name.name; | |
730 | args.in.args[2].size = newent->d_name.len + 1; | |
731 | args.in.args[2].value = newent->d_name.name; | |
732 | err = fuse_simple_request(fc, &args); | |
9e6268db | 733 | if (!err) { |
08b63307 MS |
734 | /* ctime changes */ |
735 | fuse_invalidate_attr(oldent->d_inode); | |
31f3267b | 736 | fuse_update_ctime(oldent->d_inode); |
08b63307 | 737 | |
1560c974 MS |
738 | if (flags & RENAME_EXCHANGE) { |
739 | fuse_invalidate_attr(newent->d_inode); | |
740 | fuse_update_ctime(newent->d_inode); | |
741 | } | |
742 | ||
9e6268db MS |
743 | fuse_invalidate_attr(olddir); |
744 | if (olddir != newdir) | |
745 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
746 | |
747 | /* newent will end up negative */ | |
1560c974 | 748 | if (!(flags & RENAME_EXCHANGE) && newent->d_inode) { |
5219f346 | 749 | fuse_invalidate_attr(newent->d_inode); |
8cbdf1e6 | 750 | fuse_invalidate_entry_cache(newent); |
31f3267b | 751 | fuse_update_ctime(newent->d_inode); |
5219f346 | 752 | } |
9e6268db MS |
753 | } else if (err == -EINTR) { |
754 | /* If request was interrupted, DEITY only knows if the | |
755 | rename actually took place. If the invalidation | |
756 | fails (e.g. some process has CWD under the renamed | |
757 | directory), then there can be inconsistency between | |
758 | the dcache and the real filesystem. Tough luck. */ | |
759 | fuse_invalidate_entry(oldent); | |
760 | if (newent->d_inode) | |
761 | fuse_invalidate_entry(newent); | |
762 | } | |
763 | ||
764 | return err; | |
765 | } | |
766 | ||
1560c974 MS |
767 | static int fuse_rename2(struct inode *olddir, struct dentry *oldent, |
768 | struct inode *newdir, struct dentry *newent, | |
769 | unsigned int flags) | |
770 | { | |
771 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
772 | int err; | |
773 | ||
774 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) | |
775 | return -EINVAL; | |
776 | ||
4237ba43 MS |
777 | if (flags) { |
778 | if (fc->no_rename2 || fc->minor < 23) | |
779 | return -EINVAL; | |
1560c974 | 780 | |
4237ba43 MS |
781 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, |
782 | FUSE_RENAME2, | |
783 | sizeof(struct fuse_rename2_in)); | |
784 | if (err == -ENOSYS) { | |
785 | fc->no_rename2 = 1; | |
786 | err = -EINVAL; | |
787 | } | |
788 | } else { | |
789 | err = fuse_rename_common(olddir, oldent, newdir, newent, 0, | |
790 | FUSE_RENAME, | |
791 | sizeof(struct fuse_rename_in)); | |
1560c974 | 792 | } |
4237ba43 | 793 | |
1560c974 | 794 | return err; |
4237ba43 | 795 | } |
1560c974 | 796 | |
9e6268db MS |
797 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
798 | struct dentry *newent) | |
799 | { | |
800 | int err; | |
801 | struct fuse_link_in inarg; | |
802 | struct inode *inode = entry->d_inode; | |
803 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 804 | FUSE_ARGS(args); |
9e6268db MS |
805 | |
806 | memset(&inarg, 0, sizeof(inarg)); | |
807 | inarg.oldnodeid = get_node_id(inode); | |
7078187a MS |
808 | args.in.h.opcode = FUSE_LINK; |
809 | args.in.numargs = 2; | |
810 | args.in.args[0].size = sizeof(inarg); | |
811 | args.in.args[0].value = &inarg; | |
812 | args.in.args[1].size = newent->d_name.len + 1; | |
813 | args.in.args[1].value = newent->d_name.name; | |
814 | err = create_new_entry(fc, &args, newdir, newent, inode->i_mode); | |
9e6268db MS |
815 | /* Contrary to "normal" filesystems it can happen that link |
816 | makes two "logical" inodes point to the same "physical" | |
817 | inode. We invalidate the attributes of the old one, so it | |
818 | will reflect changes in the backing inode (link count, | |
819 | etc.) | |
820 | */ | |
ac45d613 MS |
821 | if (!err) { |
822 | struct fuse_inode *fi = get_fuse_inode(inode); | |
823 | ||
824 | spin_lock(&fc->lock); | |
825 | fi->attr_version = ++fc->attr_version; | |
826 | inc_nlink(inode); | |
827 | spin_unlock(&fc->lock); | |
9e6268db | 828 | fuse_invalidate_attr(inode); |
31f3267b | 829 | fuse_update_ctime(inode); |
ac45d613 MS |
830 | } else if (err == -EINTR) { |
831 | fuse_invalidate_attr(inode); | |
832 | } | |
9e6268db MS |
833 | return err; |
834 | } | |
835 | ||
1fb69e78 MS |
836 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
837 | struct kstat *stat) | |
838 | { | |
203627bb | 839 | unsigned int blkbits; |
8373200b PE |
840 | struct fuse_conn *fc = get_fuse_conn(inode); |
841 | ||
842 | /* see the comment in fuse_change_attributes() */ | |
b0aa7606 | 843 | if (fc->writeback_cache && S_ISREG(inode->i_mode)) { |
8373200b | 844 | attr->size = i_size_read(inode); |
b0aa7606 MP |
845 | attr->mtime = inode->i_mtime.tv_sec; |
846 | attr->mtimensec = inode->i_mtime.tv_nsec; | |
31f3267b MP |
847 | attr->ctime = inode->i_ctime.tv_sec; |
848 | attr->ctimensec = inode->i_ctime.tv_nsec; | |
b0aa7606 | 849 | } |
203627bb | 850 | |
1fb69e78 MS |
851 | stat->dev = inode->i_sb->s_dev; |
852 | stat->ino = attr->ino; | |
853 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
854 | stat->nlink = attr->nlink; | |
499dcf20 EB |
855 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
856 | stat->gid = make_kgid(&init_user_ns, attr->gid); | |
1fb69e78 MS |
857 | stat->rdev = inode->i_rdev; |
858 | stat->atime.tv_sec = attr->atime; | |
859 | stat->atime.tv_nsec = attr->atimensec; | |
860 | stat->mtime.tv_sec = attr->mtime; | |
861 | stat->mtime.tv_nsec = attr->mtimensec; | |
862 | stat->ctime.tv_sec = attr->ctime; | |
863 | stat->ctime.tv_nsec = attr->ctimensec; | |
864 | stat->size = attr->size; | |
865 | stat->blocks = attr->blocks; | |
203627bb MS |
866 | |
867 | if (attr->blksize != 0) | |
868 | blkbits = ilog2(attr->blksize); | |
869 | else | |
870 | blkbits = inode->i_sb->s_blocksize_bits; | |
871 | ||
872 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
873 | } |
874 | ||
c79e322f MS |
875 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
876 | struct file *file) | |
e5e5558e MS |
877 | { |
878 | int err; | |
c79e322f MS |
879 | struct fuse_getattr_in inarg; |
880 | struct fuse_attr_out outarg; | |
e5e5558e | 881 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 882 | FUSE_ARGS(args); |
1fb69e78 MS |
883 | u64 attr_version; |
884 | ||
7dca9fd3 | 885 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 886 | |
c79e322f | 887 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 888 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
889 | /* Directories have separate file-handle space */ |
890 | if (file && S_ISREG(inode->i_mode)) { | |
891 | struct fuse_file *ff = file->private_data; | |
892 | ||
893 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
894 | inarg.fh = ff->fh; | |
895 | } | |
7078187a MS |
896 | args.in.h.opcode = FUSE_GETATTR; |
897 | args.in.h.nodeid = get_node_id(inode); | |
898 | args.in.numargs = 1; | |
899 | args.in.args[0].size = sizeof(inarg); | |
900 | args.in.args[0].value = &inarg; | |
901 | args.out.numargs = 1; | |
0e9663ee | 902 | if (fc->minor < 9) |
7078187a | 903 | args.out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; |
0e9663ee | 904 | else |
7078187a MS |
905 | args.out.args[0].size = sizeof(outarg); |
906 | args.out.args[0].value = &outarg; | |
907 | err = fuse_simple_request(fc, &args); | |
e5e5558e | 908 | if (!err) { |
c79e322f | 909 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
910 | make_bad_inode(inode); |
911 | err = -EIO; | |
912 | } else { | |
c79e322f MS |
913 | fuse_change_attributes(inode, &outarg.attr, |
914 | attr_timeout(&outarg), | |
1fb69e78 MS |
915 | attr_version); |
916 | if (stat) | |
c79e322f | 917 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
918 | } |
919 | } | |
920 | return err; | |
921 | } | |
922 | ||
bcb4be80 MS |
923 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
924 | struct file *file, bool *refreshed) | |
925 | { | |
926 | struct fuse_inode *fi = get_fuse_inode(inode); | |
927 | int err; | |
928 | bool r; | |
929 | ||
126b9d43 | 930 | if (time_before64(fi->i_time, get_jiffies_64())) { |
bcb4be80 MS |
931 | r = true; |
932 | err = fuse_do_getattr(inode, stat, file); | |
933 | } else { | |
934 | r = false; | |
935 | err = 0; | |
936 | if (stat) { | |
937 | generic_fillattr(inode, stat); | |
938 | stat->mode = fi->orig_i_mode; | |
45c72cd7 | 939 | stat->ino = fi->orig_ino; |
bcb4be80 MS |
940 | } |
941 | } | |
942 | ||
943 | if (refreshed != NULL) | |
944 | *refreshed = r; | |
945 | ||
946 | return err; | |
947 | } | |
948 | ||
3b463ae0 | 949 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 950 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
951 | { |
952 | int err = -ENOTDIR; | |
953 | struct inode *parent; | |
954 | struct dentry *dir; | |
955 | struct dentry *entry; | |
956 | ||
957 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
958 | if (!parent) | |
959 | return -ENOENT; | |
960 | ||
961 | mutex_lock(&parent->i_mutex); | |
962 | if (!S_ISDIR(parent->i_mode)) | |
963 | goto unlock; | |
964 | ||
965 | err = -ENOENT; | |
966 | dir = d_find_alias(parent); | |
967 | if (!dir) | |
968 | goto unlock; | |
969 | ||
970 | entry = d_lookup(dir, name); | |
971 | dput(dir); | |
972 | if (!entry) | |
973 | goto unlock; | |
974 | ||
975 | fuse_invalidate_attr(parent); | |
976 | fuse_invalidate_entry(entry); | |
451d0f59 JM |
977 | |
978 | if (child_nodeid != 0 && entry->d_inode) { | |
979 | mutex_lock(&entry->d_inode->i_mutex); | |
980 | if (get_node_id(entry->d_inode) != child_nodeid) { | |
981 | err = -ENOENT; | |
982 | goto badentry; | |
983 | } | |
984 | if (d_mountpoint(entry)) { | |
985 | err = -EBUSY; | |
986 | goto badentry; | |
987 | } | |
988 | if (S_ISDIR(entry->d_inode->i_mode)) { | |
989 | shrink_dcache_parent(entry); | |
990 | if (!simple_empty(entry)) { | |
991 | err = -ENOTEMPTY; | |
992 | goto badentry; | |
993 | } | |
994 | entry->d_inode->i_flags |= S_DEAD; | |
995 | } | |
996 | dont_mount(entry); | |
997 | clear_nlink(entry->d_inode); | |
998 | err = 0; | |
999 | badentry: | |
1000 | mutex_unlock(&entry->d_inode->i_mutex); | |
1001 | if (!err) | |
1002 | d_delete(entry); | |
1003 | } else { | |
1004 | err = 0; | |
1005 | } | |
3b463ae0 | 1006 | dput(entry); |
3b463ae0 JM |
1007 | |
1008 | unlock: | |
1009 | mutex_unlock(&parent->i_mutex); | |
1010 | iput(parent); | |
1011 | return err; | |
1012 | } | |
1013 | ||
87729a55 MS |
1014 | /* |
1015 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1016 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1017 | * means, that the filesystem daemon is able to record the exact |
1018 | * filesystem operations performed, and can also control the behavior | |
1019 | * of the requester process in otherwise impossible ways. For example | |
1020 | * it can delay the operation for arbitrary length of time allowing | |
1021 | * DoS against the requester. | |
1022 | * | |
1023 | * For this reason only those processes can call into the filesystem, | |
1024 | * for which the owner of the mount has ptrace privilege. This | |
1025 | * excludes processes started by other users, suid or sgid processes. | |
1026 | */ | |
c2132c1b | 1027 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1028 | { |
c69e8d9c | 1029 | const struct cred *cred; |
87729a55 | 1030 | |
c69e8d9c | 1031 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
1032 | return 1; |
1033 | ||
c2132c1b | 1034 | cred = current_cred(); |
499dcf20 EB |
1035 | if (uid_eq(cred->euid, fc->user_id) && |
1036 | uid_eq(cred->suid, fc->user_id) && | |
1037 | uid_eq(cred->uid, fc->user_id) && | |
1038 | gid_eq(cred->egid, fc->group_id) && | |
1039 | gid_eq(cred->sgid, fc->group_id) && | |
1040 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1041 | return 1; |
c69e8d9c | 1042 | |
c2132c1b | 1043 | return 0; |
87729a55 MS |
1044 | } |
1045 | ||
31d40d74 MS |
1046 | static int fuse_access(struct inode *inode, int mask) |
1047 | { | |
1048 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 1049 | FUSE_ARGS(args); |
31d40d74 MS |
1050 | struct fuse_access_in inarg; |
1051 | int err; | |
1052 | ||
698fa1d1 MS |
1053 | BUG_ON(mask & MAY_NOT_BLOCK); |
1054 | ||
31d40d74 MS |
1055 | if (fc->no_access) |
1056 | return 0; | |
1057 | ||
31d40d74 | 1058 | memset(&inarg, 0, sizeof(inarg)); |
e6305c43 | 1059 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
7078187a MS |
1060 | args.in.h.opcode = FUSE_ACCESS; |
1061 | args.in.h.nodeid = get_node_id(inode); | |
1062 | args.in.numargs = 1; | |
1063 | args.in.args[0].size = sizeof(inarg); | |
1064 | args.in.args[0].value = &inarg; | |
1065 | err = fuse_simple_request(fc, &args); | |
31d40d74 MS |
1066 | if (err == -ENOSYS) { |
1067 | fc->no_access = 1; | |
1068 | err = 0; | |
1069 | } | |
1070 | return err; | |
1071 | } | |
1072 | ||
10556cb2 | 1073 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1074 | { |
10556cb2 | 1075 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1076 | return -ECHILD; |
1077 | ||
1078 | return fuse_do_getattr(inode, NULL, NULL); | |
1079 | } | |
1080 | ||
6f9f1180 MS |
1081 | /* |
1082 | * Check permission. The two basic access models of FUSE are: | |
1083 | * | |
1084 | * 1) Local access checking ('default_permissions' mount option) based | |
1085 | * on file mode. This is the plain old disk filesystem permission | |
1086 | * modell. | |
1087 | * | |
1088 | * 2) "Remote" access checking, where server is responsible for | |
1089 | * checking permission in each inode operation. An exception to this | |
1090 | * is if ->permission() was invoked from sys_access() in which case an | |
1091 | * access request is sent. Execute permission is still checked | |
1092 | * locally based on file mode. | |
1093 | */ | |
10556cb2 | 1094 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1095 | { |
1096 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1097 | bool refreshed = false; |
1098 | int err = 0; | |
e5e5558e | 1099 | |
c2132c1b | 1100 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1101 | return -EACCES; |
244f6385 MS |
1102 | |
1103 | /* | |
e8e96157 | 1104 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1105 | */ |
e8e96157 MS |
1106 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1107 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
19690ddb MS |
1108 | struct fuse_inode *fi = get_fuse_inode(inode); |
1109 | ||
126b9d43 | 1110 | if (time_before64(fi->i_time, get_jiffies_64())) { |
19690ddb MS |
1111 | refreshed = true; |
1112 | ||
10556cb2 | 1113 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1114 | if (err) |
1115 | return err; | |
1116 | } | |
244f6385 MS |
1117 | } |
1118 | ||
1119 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
2830ba7f | 1120 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1121 | |
1122 | /* If permission is denied, try to refresh file | |
1123 | attributes. This is also needed, because the root | |
1124 | node will at first have no permissions */ | |
244f6385 | 1125 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1126 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1127 | if (!err) |
2830ba7f | 1128 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1129 | } |
1130 | ||
6f9f1180 MS |
1131 | /* Note: the opposite of the above test does not |
1132 | exist. So if permissions are revoked this won't be | |
1133 | noticed immediately, only after the attribute | |
1134 | timeout has expired */ | |
9cfcac81 | 1135 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1136 | err = fuse_access(inode, mask); |
1137 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1138 | if (!(inode->i_mode & S_IXUGO)) { | |
1139 | if (refreshed) | |
1140 | return -EACCES; | |
1141 | ||
10556cb2 | 1142 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1143 | if (!err && !(inode->i_mode & S_IXUGO)) |
1144 | return -EACCES; | |
1145 | } | |
e5e5558e | 1146 | } |
244f6385 | 1147 | return err; |
e5e5558e MS |
1148 | } |
1149 | ||
1150 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1151 | struct dir_context *ctx) |
e5e5558e MS |
1152 | { |
1153 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1154 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1155 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
e5e5558e MS |
1156 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
1157 | return -EIO; | |
1158 | if (reclen > nbytes) | |
1159 | break; | |
efeb9e60 MS |
1160 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1161 | return -EIO; | |
e5e5558e | 1162 | |
8d3af7f3 AV |
1163 | if (!dir_emit(ctx, dirent->name, dirent->namelen, |
1164 | dirent->ino, dirent->type)) | |
e5e5558e MS |
1165 | break; |
1166 | ||
1167 | buf += reclen; | |
1168 | nbytes -= reclen; | |
8d3af7f3 | 1169 | ctx->pos = dirent->off; |
e5e5558e MS |
1170 | } |
1171 | ||
1172 | return 0; | |
1173 | } | |
1174 | ||
0b05b183 AA |
1175 | static int fuse_direntplus_link(struct file *file, |
1176 | struct fuse_direntplus *direntplus, | |
1177 | u64 attr_version) | |
1178 | { | |
1179 | int err; | |
1180 | struct fuse_entry_out *o = &direntplus->entry_out; | |
1181 | struct fuse_dirent *dirent = &direntplus->dirent; | |
1182 | struct dentry *parent = file->f_path.dentry; | |
1183 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); | |
1184 | struct dentry *dentry; | |
1185 | struct dentry *alias; | |
1186 | struct inode *dir = parent->d_inode; | |
1187 | struct fuse_conn *fc; | |
1188 | struct inode *inode; | |
1189 | ||
1190 | if (!o->nodeid) { | |
1191 | /* | |
1192 | * Unlike in the case of fuse_lookup, zero nodeid does not mean | |
1193 | * ENOENT. Instead, it only means the userspace filesystem did | |
1194 | * not want to return attributes/handle for this entry. | |
1195 | * | |
1196 | * So do nothing. | |
1197 | */ | |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | if (name.name[0] == '.') { | |
1202 | /* | |
1203 | * We could potentially refresh the attributes of the directory | |
1204 | * and its parent? | |
1205 | */ | |
1206 | if (name.len == 1) | |
1207 | return 0; | |
1208 | if (name.name[1] == '.' && name.len == 2) | |
1209 | return 0; | |
1210 | } | |
a28ef45c MS |
1211 | |
1212 | if (invalid_nodeid(o->nodeid)) | |
1213 | return -EIO; | |
1214 | if (!fuse_valid_type(o->attr.mode)) | |
1215 | return -EIO; | |
1216 | ||
0b05b183 AA |
1217 | fc = get_fuse_conn(dir); |
1218 | ||
1219 | name.hash = full_name_hash(name.name, name.len); | |
1220 | dentry = d_lookup(parent, &name); | |
53ce9a33 | 1221 | if (dentry) { |
0b05b183 | 1222 | inode = dentry->d_inode; |
53ce9a33 NV |
1223 | if (!inode) { |
1224 | d_drop(dentry); | |
a28ef45c MS |
1225 | } else if (get_node_id(inode) != o->nodeid || |
1226 | ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { | |
5542aa2f | 1227 | d_invalidate(dentry); |
a28ef45c MS |
1228 | } else if (is_bad_inode(inode)) { |
1229 | err = -EIO; | |
1230 | goto out; | |
53ce9a33 | 1231 | } else { |
0b05b183 AA |
1232 | struct fuse_inode *fi; |
1233 | fi = get_fuse_inode(inode); | |
1234 | spin_lock(&fc->lock); | |
1235 | fi->nlookup++; | |
1236 | spin_unlock(&fc->lock); | |
1237 | ||
fa2b7213 MS |
1238 | fuse_change_attributes(inode, &o->attr, |
1239 | entry_attr_timeout(o), | |
1240 | attr_version); | |
1241 | ||
0b05b183 AA |
1242 | /* |
1243 | * The other branch to 'found' comes via fuse_iget() | |
1244 | * which bumps nlookup inside | |
1245 | */ | |
1246 | goto found; | |
1247 | } | |
0b05b183 | 1248 | dput(dentry); |
0b05b183 AA |
1249 | } |
1250 | ||
1251 | dentry = d_alloc(parent, &name); | |
1252 | err = -ENOMEM; | |
1253 | if (!dentry) | |
1254 | goto out; | |
1255 | ||
1256 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, | |
1257 | &o->attr, entry_attr_timeout(o), attr_version); | |
1258 | if (!inode) | |
1259 | goto out; | |
1260 | ||
41d28bca | 1261 | alias = d_splice_alias(inode, dentry); |
5835f339 MS |
1262 | err = PTR_ERR(alias); |
1263 | if (IS_ERR(alias)) | |
1264 | goto out; | |
2914941e | 1265 | |
0b05b183 AA |
1266 | if (alias) { |
1267 | dput(dentry); | |
1268 | dentry = alias; | |
1269 | } | |
1270 | ||
1271 | found: | |
6314efee MS |
1272 | if (fc->readdirplus_auto) |
1273 | set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state); | |
0b05b183 AA |
1274 | fuse_change_entry_timeout(dentry, o); |
1275 | ||
1276 | err = 0; | |
1277 | out: | |
c7263bcd | 1278 | dput(dentry); |
0b05b183 AA |
1279 | return err; |
1280 | } | |
1281 | ||
1282 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1283 | struct dir_context *ctx, u64 attr_version) |
0b05b183 AA |
1284 | { |
1285 | struct fuse_direntplus *direntplus; | |
1286 | struct fuse_dirent *dirent; | |
1287 | size_t reclen; | |
1288 | int over = 0; | |
1289 | int ret; | |
1290 | ||
1291 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { | |
1292 | direntplus = (struct fuse_direntplus *) buf; | |
1293 | dirent = &direntplus->dirent; | |
1294 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); | |
1295 | ||
1296 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1297 | return -EIO; | |
1298 | if (reclen > nbytes) | |
1299 | break; | |
efeb9e60 MS |
1300 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1301 | return -EIO; | |
0b05b183 AA |
1302 | |
1303 | if (!over) { | |
1304 | /* We fill entries into dstbuf only as much as | |
1305 | it can hold. But we still continue iterating | |
1306 | over remaining entries to link them. If not, | |
1307 | we need to send a FORGET for each of those | |
1308 | which we did not link. | |
1309 | */ | |
8d3af7f3 AV |
1310 | over = !dir_emit(ctx, dirent->name, dirent->namelen, |
1311 | dirent->ino, dirent->type); | |
1312 | ctx->pos = dirent->off; | |
0b05b183 AA |
1313 | } |
1314 | ||
1315 | buf += reclen; | |
1316 | nbytes -= reclen; | |
1317 | ||
1318 | ret = fuse_direntplus_link(file, direntplus, attr_version); | |
1319 | if (ret) | |
1320 | fuse_force_forget(file, direntplus->entry_out.nodeid); | |
1321 | } | |
1322 | ||
1323 | return 0; | |
1324 | } | |
1325 | ||
8d3af7f3 | 1326 | static int fuse_readdir(struct file *file, struct dir_context *ctx) |
e5e5558e | 1327 | { |
4582a4ab | 1328 | int plus, err; |
04730fef MS |
1329 | size_t nbytes; |
1330 | struct page *page; | |
496ad9aa | 1331 | struct inode *inode = file_inode(file); |
e5e5558e | 1332 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 | 1333 | struct fuse_req *req; |
0b05b183 | 1334 | u64 attr_version = 0; |
248d86e8 MS |
1335 | |
1336 | if (is_bad_inode(inode)) | |
1337 | return -EIO; | |
1338 | ||
b111c8c0 | 1339 | req = fuse_get_req(fc, 1); |
ce1d5a49 MS |
1340 | if (IS_ERR(req)) |
1341 | return PTR_ERR(req); | |
e5e5558e | 1342 | |
04730fef MS |
1343 | page = alloc_page(GFP_KERNEL); |
1344 | if (!page) { | |
1345 | fuse_put_request(fc, req); | |
1346 | return -ENOMEM; | |
1347 | } | |
4582a4ab | 1348 | |
8d3af7f3 | 1349 | plus = fuse_use_readdirplus(inode, ctx); |
f4975c67 | 1350 | req->out.argpages = 1; |
04730fef MS |
1351 | req->num_pages = 1; |
1352 | req->pages[0] = page; | |
85f40aec | 1353 | req->page_descs[0].length = PAGE_SIZE; |
4582a4ab | 1354 | if (plus) { |
0b05b183 | 1355 | attr_version = fuse_get_attr_version(fc); |
8d3af7f3 | 1356 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1357 | FUSE_READDIRPLUS); |
1358 | } else { | |
8d3af7f3 | 1359 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1360 | FUSE_READDIR); |
1361 | } | |
b93f858a | 1362 | fuse_request_send(fc, req); |
361b1eb5 | 1363 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1364 | err = req->out.h.error; |
1365 | fuse_put_request(fc, req); | |
0b05b183 | 1366 | if (!err) { |
4582a4ab | 1367 | if (plus) { |
0b05b183 | 1368 | err = parse_dirplusfile(page_address(page), nbytes, |
8d3af7f3 | 1369 | file, ctx, |
0b05b183 AA |
1370 | attr_version); |
1371 | } else { | |
1372 | err = parse_dirfile(page_address(page), nbytes, file, | |
8d3af7f3 | 1373 | ctx); |
0b05b183 AA |
1374 | } |
1375 | } | |
e5e5558e | 1376 | |
04730fef | 1377 | __free_page(page); |
451418fc | 1378 | fuse_invalidate_atime(inode); |
04730fef | 1379 | return err; |
e5e5558e MS |
1380 | } |
1381 | ||
1382 | static char *read_link(struct dentry *dentry) | |
1383 | { | |
1384 | struct inode *inode = dentry->d_inode; | |
1385 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 1386 | FUSE_ARGS(args); |
e5e5558e | 1387 | char *link; |
7078187a | 1388 | ssize_t ret; |
e5e5558e MS |
1389 | |
1390 | link = (char *) __get_free_page(GFP_KERNEL); | |
7078187a MS |
1391 | if (!link) |
1392 | return ERR_PTR(-ENOMEM); | |
1393 | ||
1394 | args.in.h.opcode = FUSE_READLINK; | |
1395 | args.in.h.nodeid = get_node_id(inode); | |
1396 | args.out.argvar = 1; | |
1397 | args.out.numargs = 1; | |
1398 | args.out.args[0].size = PAGE_SIZE - 1; | |
1399 | args.out.args[0].value = link; | |
1400 | ret = fuse_simple_request(fc, &args); | |
1401 | if (ret < 0) { | |
e5e5558e | 1402 | free_page((unsigned long) link); |
7078187a MS |
1403 | link = ERR_PTR(ret); |
1404 | } else { | |
1405 | link[ret] = '\0'; | |
1406 | } | |
451418fc | 1407 | fuse_invalidate_atime(inode); |
e5e5558e MS |
1408 | return link; |
1409 | } | |
1410 | ||
1411 | static void free_link(char *link) | |
1412 | { | |
1413 | if (!IS_ERR(link)) | |
1414 | free_page((unsigned long) link); | |
1415 | } | |
1416 | ||
1417 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1418 | { | |
1419 | nd_set_link(nd, read_link(dentry)); | |
1420 | return NULL; | |
1421 | } | |
1422 | ||
1423 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1424 | { | |
1425 | free_link(nd_get_link(nd)); | |
1426 | } | |
1427 | ||
1428 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1429 | { | |
91fe96b4 | 1430 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1431 | } |
1432 | ||
1433 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1434 | { | |
8b0797a4 MS |
1435 | fuse_release_common(file, FUSE_RELEASEDIR); |
1436 | ||
1437 | return 0; | |
e5e5558e MS |
1438 | } |
1439 | ||
02c24a82 JB |
1440 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1441 | int datasync) | |
82547981 | 1442 | { |
02c24a82 | 1443 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1444 | } |
1445 | ||
b18da0c5 MS |
1446 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1447 | unsigned long arg) | |
1448 | { | |
1449 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1450 | ||
1451 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1452 | if (fc->minor < 18) | |
1453 | return -ENOTTY; | |
1454 | ||
1455 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1456 | } | |
1457 | ||
1458 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1459 | unsigned long arg) | |
1460 | { | |
1461 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1462 | ||
1463 | if (fc->minor < 18) | |
1464 | return -ENOTTY; | |
1465 | ||
1466 | return fuse_ioctl_common(file, cmd, arg, | |
1467 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1468 | } | |
1469 | ||
b0aa7606 | 1470 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
17637cba MS |
1471 | { |
1472 | /* Always update if mtime is explicitly set */ | |
1473 | if (ivalid & ATTR_MTIME_SET) | |
1474 | return true; | |
1475 | ||
b0aa7606 MP |
1476 | /* Or if kernel i_mtime is the official one */ |
1477 | if (trust_local_mtime) | |
1478 | return true; | |
1479 | ||
17637cba MS |
1480 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
1481 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1482 | return false; | |
1483 | ||
1484 | /* In all other cases update */ | |
1485 | return true; | |
1486 | } | |
1487 | ||
b0aa7606 | 1488 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg, |
3ad22c62 | 1489 | bool trust_local_cmtime) |
9e6268db MS |
1490 | { |
1491 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1492 | |
1493 | if (ivalid & ATTR_MODE) | |
befc649c | 1494 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1495 | if (ivalid & ATTR_UID) |
499dcf20 | 1496 | arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid); |
9e6268db | 1497 | if (ivalid & ATTR_GID) |
499dcf20 | 1498 | arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid); |
9e6268db | 1499 | if (ivalid & ATTR_SIZE) |
befc649c | 1500 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1501 | if (ivalid & ATTR_ATIME) { |
1502 | arg->valid |= FATTR_ATIME; | |
befc649c | 1503 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1504 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1505 | if (!(ivalid & ATTR_ATIME_SET)) | |
1506 | arg->valid |= FATTR_ATIME_NOW; | |
1507 | } | |
3ad22c62 | 1508 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
17637cba | 1509 | arg->valid |= FATTR_MTIME; |
befc649c | 1510 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba | 1511 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
3ad22c62 | 1512 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
17637cba | 1513 | arg->valid |= FATTR_MTIME_NOW; |
befc649c | 1514 | } |
3ad22c62 MP |
1515 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
1516 | arg->valid |= FATTR_CTIME; | |
1517 | arg->ctime = iattr->ia_ctime.tv_sec; | |
1518 | arg->ctimensec = iattr->ia_ctime.tv_nsec; | |
1519 | } | |
9e6268db MS |
1520 | } |
1521 | ||
3be5a52b MS |
1522 | /* |
1523 | * Prevent concurrent writepages on inode | |
1524 | * | |
1525 | * This is done by adding a negative bias to the inode write counter | |
1526 | * and waiting for all pending writes to finish. | |
1527 | */ | |
1528 | void fuse_set_nowrite(struct inode *inode) | |
1529 | { | |
1530 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1531 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1532 | ||
1533 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1534 | ||
1535 | spin_lock(&fc->lock); | |
1536 | BUG_ON(fi->writectr < 0); | |
1537 | fi->writectr += FUSE_NOWRITE; | |
1538 | spin_unlock(&fc->lock); | |
1539 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1540 | } | |
1541 | ||
1542 | /* | |
1543 | * Allow writepages on inode | |
1544 | * | |
1545 | * Remove the bias from the writecounter and send any queued | |
1546 | * writepages. | |
1547 | */ | |
1548 | static void __fuse_release_nowrite(struct inode *inode) | |
1549 | { | |
1550 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1551 | ||
1552 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1553 | fi->writectr = 0; | |
1554 | fuse_flush_writepages(inode); | |
1555 | } | |
1556 | ||
1557 | void fuse_release_nowrite(struct inode *inode) | |
1558 | { | |
1559 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1560 | ||
1561 | spin_lock(&fc->lock); | |
1562 | __fuse_release_nowrite(inode); | |
1563 | spin_unlock(&fc->lock); | |
1564 | } | |
1565 | ||
7078187a | 1566 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args, |
b0aa7606 MP |
1567 | struct inode *inode, |
1568 | struct fuse_setattr_in *inarg_p, | |
1569 | struct fuse_attr_out *outarg_p) | |
1570 | { | |
7078187a MS |
1571 | args->in.h.opcode = FUSE_SETATTR; |
1572 | args->in.h.nodeid = get_node_id(inode); | |
1573 | args->in.numargs = 1; | |
1574 | args->in.args[0].size = sizeof(*inarg_p); | |
1575 | args->in.args[0].value = inarg_p; | |
1576 | args->out.numargs = 1; | |
b0aa7606 | 1577 | if (fc->minor < 9) |
7078187a | 1578 | args->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; |
b0aa7606 | 1579 | else |
7078187a MS |
1580 | args->out.args[0].size = sizeof(*outarg_p); |
1581 | args->out.args[0].value = outarg_p; | |
b0aa7606 MP |
1582 | } |
1583 | ||
1584 | /* | |
1585 | * Flush inode->i_mtime to the server | |
1586 | */ | |
ab9e13f7 | 1587 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
b0aa7606 | 1588 | { |
b0aa7606 | 1589 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 1590 | FUSE_ARGS(args); |
b0aa7606 MP |
1591 | struct fuse_setattr_in inarg; |
1592 | struct fuse_attr_out outarg; | |
b0aa7606 MP |
1593 | |
1594 | memset(&inarg, 0, sizeof(inarg)); | |
1595 | memset(&outarg, 0, sizeof(outarg)); | |
1596 | ||
ab9e13f7 | 1597 | inarg.valid = FATTR_MTIME; |
b0aa7606 MP |
1598 | inarg.mtime = inode->i_mtime.tv_sec; |
1599 | inarg.mtimensec = inode->i_mtime.tv_nsec; | |
ab9e13f7 MP |
1600 | if (fc->minor >= 23) { |
1601 | inarg.valid |= FATTR_CTIME; | |
1602 | inarg.ctime = inode->i_ctime.tv_sec; | |
1603 | inarg.ctimensec = inode->i_ctime.tv_nsec; | |
1604 | } | |
1e18bda8 MS |
1605 | if (ff) { |
1606 | inarg.valid |= FATTR_FH; | |
1607 | inarg.fh = ff->fh; | |
1608 | } | |
7078187a | 1609 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
b0aa7606 | 1610 | |
7078187a | 1611 | return fuse_simple_request(fc, &args); |
b0aa7606 MP |
1612 | } |
1613 | ||
6f9f1180 MS |
1614 | /* |
1615 | * Set attributes, and at the same time refresh them. | |
1616 | * | |
1617 | * Truncation is slightly complicated, because the 'truncate' request | |
1618 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1619 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1620 | * and the actual truncation by hand. | |
6f9f1180 | 1621 | */ |
efb9fa9e MP |
1622 | int fuse_do_setattr(struct inode *inode, struct iattr *attr, |
1623 | struct file *file) | |
9e6268db | 1624 | { |
9e6268db | 1625 | struct fuse_conn *fc = get_fuse_conn(inode); |
06a7c3c2 | 1626 | struct fuse_inode *fi = get_fuse_inode(inode); |
7078187a | 1627 | FUSE_ARGS(args); |
9e6268db MS |
1628 | struct fuse_setattr_in inarg; |
1629 | struct fuse_attr_out outarg; | |
3be5a52b | 1630 | bool is_truncate = false; |
8373200b | 1631 | bool is_wb = fc->writeback_cache; |
3be5a52b | 1632 | loff_t oldsize; |
9e6268db | 1633 | int err; |
3ad22c62 | 1634 | bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode); |
9e6268db | 1635 | |
db78b877 CH |
1636 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1637 | attr->ia_valid |= ATTR_FORCE; | |
1638 | ||
1639 | err = inode_change_ok(inode, attr); | |
1640 | if (err) | |
1641 | return err; | |
1e9a4ed9 | 1642 | |
8d56addd MS |
1643 | if (attr->ia_valid & ATTR_OPEN) { |
1644 | if (fc->atomic_o_trunc) | |
1645 | return 0; | |
1646 | file = NULL; | |
1647 | } | |
6ff958ed | 1648 | |
2c27c65e | 1649 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1650 | is_truncate = true; |
9e6268db | 1651 | |
06a7c3c2 | 1652 | if (is_truncate) { |
3be5a52b | 1653 | fuse_set_nowrite(inode); |
06a7c3c2 | 1654 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3ad22c62 MP |
1655 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
1656 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; | |
06a7c3c2 | 1657 | } |
3be5a52b | 1658 | |
9e6268db | 1659 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1660 | memset(&outarg, 0, sizeof(outarg)); |
3ad22c62 | 1661 | iattr_to_fattr(attr, &inarg, trust_local_cmtime); |
49d4914f MS |
1662 | if (file) { |
1663 | struct fuse_file *ff = file->private_data; | |
1664 | inarg.valid |= FATTR_FH; | |
1665 | inarg.fh = ff->fh; | |
1666 | } | |
f3332114 MS |
1667 | if (attr->ia_valid & ATTR_SIZE) { |
1668 | /* For mandatory locking in truncate */ | |
1669 | inarg.valid |= FATTR_LOCKOWNER; | |
1670 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1671 | } | |
7078187a MS |
1672 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
1673 | err = fuse_simple_request(fc, &args); | |
e00d2c2d MS |
1674 | if (err) { |
1675 | if (err == -EINTR) | |
1676 | fuse_invalidate_attr(inode); | |
3be5a52b | 1677 | goto error; |
e00d2c2d | 1678 | } |
9e6268db | 1679 | |
e00d2c2d MS |
1680 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1681 | make_bad_inode(inode); | |
3be5a52b MS |
1682 | err = -EIO; |
1683 | goto error; | |
1684 | } | |
1685 | ||
1686 | spin_lock(&fc->lock); | |
b0aa7606 | 1687 | /* the kernel maintains i_mtime locally */ |
3ad22c62 MP |
1688 | if (trust_local_cmtime) { |
1689 | if (attr->ia_valid & ATTR_MTIME) | |
1690 | inode->i_mtime = attr->ia_mtime; | |
1691 | if (attr->ia_valid & ATTR_CTIME) | |
1692 | inode->i_ctime = attr->ia_ctime; | |
1e18bda8 | 1693 | /* FIXME: clear I_DIRTY_SYNC? */ |
b0aa7606 MP |
1694 | } |
1695 | ||
3be5a52b MS |
1696 | fuse_change_attributes_common(inode, &outarg.attr, |
1697 | attr_timeout(&outarg)); | |
1698 | oldsize = inode->i_size; | |
8373200b PE |
1699 | /* see the comment in fuse_change_attributes() */ |
1700 | if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) | |
1701 | i_size_write(inode, outarg.attr.size); | |
3be5a52b MS |
1702 | |
1703 | if (is_truncate) { | |
1704 | /* NOTE: this may release/reacquire fc->lock */ | |
1705 | __fuse_release_nowrite(inode); | |
1706 | } | |
1707 | spin_unlock(&fc->lock); | |
1708 | ||
1709 | /* | |
1710 | * Only call invalidate_inode_pages2() after removing | |
1711 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1712 | */ | |
8373200b PE |
1713 | if ((is_truncate || !is_wb) && |
1714 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1715 | truncate_pagecache(inode, outarg.attr.size); |
3be5a52b | 1716 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1717 | } |
1718 | ||
06a7c3c2 | 1719 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
e00d2c2d | 1720 | return 0; |
3be5a52b MS |
1721 | |
1722 | error: | |
1723 | if (is_truncate) | |
1724 | fuse_release_nowrite(inode); | |
1725 | ||
06a7c3c2 | 1726 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3be5a52b | 1727 | return err; |
9e6268db MS |
1728 | } |
1729 | ||
49d4914f MS |
1730 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1731 | { | |
efb9fa9e MP |
1732 | struct inode *inode = entry->d_inode; |
1733 | ||
1734 | if (!fuse_allow_current_process(get_fuse_conn(inode))) | |
1735 | return -EACCES; | |
1736 | ||
49d4914f | 1737 | if (attr->ia_valid & ATTR_FILE) |
efb9fa9e | 1738 | return fuse_do_setattr(inode, attr, attr->ia_file); |
49d4914f | 1739 | else |
efb9fa9e | 1740 | return fuse_do_setattr(inode, attr, NULL); |
49d4914f MS |
1741 | } |
1742 | ||
e5e5558e MS |
1743 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1744 | struct kstat *stat) | |
1745 | { | |
1746 | struct inode *inode = entry->d_inode; | |
244f6385 | 1747 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1748 | |
c2132c1b | 1749 | if (!fuse_allow_current_process(fc)) |
244f6385 MS |
1750 | return -EACCES; |
1751 | ||
bcb4be80 | 1752 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1753 | } |
1754 | ||
92a8780e MS |
1755 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1756 | const void *value, size_t size, int flags) | |
1757 | { | |
1758 | struct inode *inode = entry->d_inode; | |
1759 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 1760 | FUSE_ARGS(args); |
92a8780e MS |
1761 | struct fuse_setxattr_in inarg; |
1762 | int err; | |
1763 | ||
92a8780e MS |
1764 | if (fc->no_setxattr) |
1765 | return -EOPNOTSUPP; | |
1766 | ||
92a8780e MS |
1767 | memset(&inarg, 0, sizeof(inarg)); |
1768 | inarg.size = size; | |
1769 | inarg.flags = flags; | |
7078187a MS |
1770 | args.in.h.opcode = FUSE_SETXATTR; |
1771 | args.in.h.nodeid = get_node_id(inode); | |
1772 | args.in.numargs = 3; | |
1773 | args.in.args[0].size = sizeof(inarg); | |
1774 | args.in.args[0].value = &inarg; | |
1775 | args.in.args[1].size = strlen(name) + 1; | |
1776 | args.in.args[1].value = name; | |
1777 | args.in.args[2].size = size; | |
1778 | args.in.args[2].value = value; | |
1779 | err = fuse_simple_request(fc, &args); | |
92a8780e MS |
1780 | if (err == -ENOSYS) { |
1781 | fc->no_setxattr = 1; | |
1782 | err = -EOPNOTSUPP; | |
1783 | } | |
31f3267b | 1784 | if (!err) { |
d331a415 | 1785 | fuse_invalidate_attr(inode); |
31f3267b MP |
1786 | fuse_update_ctime(inode); |
1787 | } | |
92a8780e MS |
1788 | return err; |
1789 | } | |
1790 | ||
1791 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1792 | void *value, size_t size) | |
1793 | { | |
1794 | struct inode *inode = entry->d_inode; | |
1795 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 1796 | FUSE_ARGS(args); |
92a8780e MS |
1797 | struct fuse_getxattr_in inarg; |
1798 | struct fuse_getxattr_out outarg; | |
1799 | ssize_t ret; | |
1800 | ||
1801 | if (fc->no_getxattr) | |
1802 | return -EOPNOTSUPP; | |
1803 | ||
92a8780e MS |
1804 | memset(&inarg, 0, sizeof(inarg)); |
1805 | inarg.size = size; | |
7078187a MS |
1806 | args.in.h.opcode = FUSE_GETXATTR; |
1807 | args.in.h.nodeid = get_node_id(inode); | |
1808 | args.in.numargs = 2; | |
1809 | args.in.args[0].size = sizeof(inarg); | |
1810 | args.in.args[0].value = &inarg; | |
1811 | args.in.args[1].size = strlen(name) + 1; | |
1812 | args.in.args[1].value = name; | |
92a8780e | 1813 | /* This is really two different operations rolled into one */ |
7078187a | 1814 | args.out.numargs = 1; |
92a8780e | 1815 | if (size) { |
7078187a MS |
1816 | args.out.argvar = 1; |
1817 | args.out.args[0].size = size; | |
1818 | args.out.args[0].value = value; | |
92a8780e | 1819 | } else { |
7078187a MS |
1820 | args.out.args[0].size = sizeof(outarg); |
1821 | args.out.args[0].value = &outarg; | |
92a8780e | 1822 | } |
7078187a MS |
1823 | ret = fuse_simple_request(fc, &args); |
1824 | if (!ret && !size) | |
1825 | ret = outarg.size; | |
1826 | if (ret == -ENOSYS) { | |
1827 | fc->no_getxattr = 1; | |
1828 | ret = -EOPNOTSUPP; | |
92a8780e | 1829 | } |
92a8780e MS |
1830 | return ret; |
1831 | } | |
1832 | ||
1833 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1834 | { | |
1835 | struct inode *inode = entry->d_inode; | |
1836 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 1837 | FUSE_ARGS(args); |
92a8780e MS |
1838 | struct fuse_getxattr_in inarg; |
1839 | struct fuse_getxattr_out outarg; | |
1840 | ssize_t ret; | |
1841 | ||
c2132c1b | 1842 | if (!fuse_allow_current_process(fc)) |
e57ac683 MS |
1843 | return -EACCES; |
1844 | ||
92a8780e MS |
1845 | if (fc->no_listxattr) |
1846 | return -EOPNOTSUPP; | |
1847 | ||
92a8780e MS |
1848 | memset(&inarg, 0, sizeof(inarg)); |
1849 | inarg.size = size; | |
7078187a MS |
1850 | args.in.h.opcode = FUSE_LISTXATTR; |
1851 | args.in.h.nodeid = get_node_id(inode); | |
1852 | args.in.numargs = 1; | |
1853 | args.in.args[0].size = sizeof(inarg); | |
1854 | args.in.args[0].value = &inarg; | |
92a8780e | 1855 | /* This is really two different operations rolled into one */ |
7078187a | 1856 | args.out.numargs = 1; |
92a8780e | 1857 | if (size) { |
7078187a MS |
1858 | args.out.argvar = 1; |
1859 | args.out.args[0].size = size; | |
1860 | args.out.args[0].value = list; | |
92a8780e | 1861 | } else { |
7078187a MS |
1862 | args.out.args[0].size = sizeof(outarg); |
1863 | args.out.args[0].value = &outarg; | |
92a8780e | 1864 | } |
7078187a MS |
1865 | ret = fuse_simple_request(fc, &args); |
1866 | if (!ret && !size) | |
1867 | ret = outarg.size; | |
1868 | if (ret == -ENOSYS) { | |
1869 | fc->no_listxattr = 1; | |
1870 | ret = -EOPNOTSUPP; | |
92a8780e | 1871 | } |
92a8780e MS |
1872 | return ret; |
1873 | } | |
1874 | ||
1875 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1876 | { | |
1877 | struct inode *inode = entry->d_inode; | |
1878 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 1879 | FUSE_ARGS(args); |
92a8780e MS |
1880 | int err; |
1881 | ||
1882 | if (fc->no_removexattr) | |
1883 | return -EOPNOTSUPP; | |
1884 | ||
7078187a MS |
1885 | args.in.h.opcode = FUSE_REMOVEXATTR; |
1886 | args.in.h.nodeid = get_node_id(inode); | |
1887 | args.in.numargs = 1; | |
1888 | args.in.args[0].size = strlen(name) + 1; | |
1889 | args.in.args[0].value = name; | |
1890 | err = fuse_simple_request(fc, &args); | |
92a8780e MS |
1891 | if (err == -ENOSYS) { |
1892 | fc->no_removexattr = 1; | |
1893 | err = -EOPNOTSUPP; | |
1894 | } | |
31f3267b | 1895 | if (!err) { |
d331a415 | 1896 | fuse_invalidate_attr(inode); |
31f3267b MP |
1897 | fuse_update_ctime(inode); |
1898 | } | |
92a8780e MS |
1899 | return err; |
1900 | } | |
1901 | ||
754661f1 | 1902 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1903 | .lookup = fuse_lookup, |
9e6268db MS |
1904 | .mkdir = fuse_mkdir, |
1905 | .symlink = fuse_symlink, | |
1906 | .unlink = fuse_unlink, | |
1907 | .rmdir = fuse_rmdir, | |
1560c974 | 1908 | .rename2 = fuse_rename2, |
9e6268db MS |
1909 | .link = fuse_link, |
1910 | .setattr = fuse_setattr, | |
1911 | .create = fuse_create, | |
c8ccbe03 | 1912 | .atomic_open = fuse_atomic_open, |
9e6268db | 1913 | .mknod = fuse_mknod, |
e5e5558e MS |
1914 | .permission = fuse_permission, |
1915 | .getattr = fuse_getattr, | |
92a8780e MS |
1916 | .setxattr = fuse_setxattr, |
1917 | .getxattr = fuse_getxattr, | |
1918 | .listxattr = fuse_listxattr, | |
1919 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1920 | }; |
1921 | ||
4b6f5d20 | 1922 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1923 | .llseek = generic_file_llseek, |
e5e5558e | 1924 | .read = generic_read_dir, |
8d3af7f3 | 1925 | .iterate = fuse_readdir, |
e5e5558e MS |
1926 | .open = fuse_dir_open, |
1927 | .release = fuse_dir_release, | |
82547981 | 1928 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1929 | .unlocked_ioctl = fuse_dir_ioctl, |
1930 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1931 | }; |
1932 | ||
754661f1 | 1933 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1934 | .setattr = fuse_setattr, |
e5e5558e MS |
1935 | .permission = fuse_permission, |
1936 | .getattr = fuse_getattr, | |
92a8780e MS |
1937 | .setxattr = fuse_setxattr, |
1938 | .getxattr = fuse_getxattr, | |
1939 | .listxattr = fuse_listxattr, | |
1940 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1941 | }; |
1942 | ||
754661f1 | 1943 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1944 | .setattr = fuse_setattr, |
e5e5558e MS |
1945 | .follow_link = fuse_follow_link, |
1946 | .put_link = fuse_put_link, | |
1947 | .readlink = generic_readlink, | |
1948 | .getattr = fuse_getattr, | |
92a8780e MS |
1949 | .setxattr = fuse_setxattr, |
1950 | .getxattr = fuse_getxattr, | |
1951 | .listxattr = fuse_listxattr, | |
1952 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1953 | }; |
1954 | ||
1955 | void fuse_init_common(struct inode *inode) | |
1956 | { | |
1957 | inode->i_op = &fuse_common_inode_operations; | |
1958 | } | |
1959 | ||
1960 | void fuse_init_dir(struct inode *inode) | |
1961 | { | |
1962 | inode->i_op = &fuse_dir_inode_operations; | |
1963 | inode->i_fop = &fuse_dir_operations; | |
1964 | } | |
1965 | ||
1966 | void fuse_init_symlink(struct inode *inode) | |
1967 | { | |
1968 | inode->i_op = &fuse_symlink_inode_operations; | |
1969 | } |