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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 | ||
c180eebe MS |
148 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_req *req, |
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)); |
e5e5558e | 153 | req->in.h.opcode = FUSE_LOOKUP; |
c180eebe | 154 | req->in.h.nodeid = nodeid; |
e5e5558e | 155 | req->in.numargs = 1; |
c180eebe MS |
156 | req->in.args[0].size = name->len + 1; |
157 | req->in.args[0].value = name->name; | |
e5e5558e | 158 | req->out.numargs = 1; |
0e9663ee MS |
159 | if (fc->minor < 9) |
160 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
161 | else | |
162 | req->out.args[0].size = sizeof(struct fuse_entry_out); | |
e5e5558e MS |
163 | req->out.args[0].value = outarg; |
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; |
0a0898cf | 201 | else if (fuse_dentry_time(entry) < get_jiffies_64()) { |
e5e5558e | 202 | int err; |
e5e5558e | 203 | struct fuse_entry_out outarg; |
8cbdf1e6 | 204 | struct fuse_req *req; |
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); |
b111c8c0 | 217 | req = fuse_get_req_nopages(fc); |
e2a6b952 | 218 | ret = PTR_ERR(req); |
ce1d5a49 | 219 | if (IS_ERR(req)) |
e2a6b952 | 220 | goto out; |
e5e5558e | 221 | |
07e77dca MS |
222 | forget = fuse_alloc_forget(); |
223 | if (!forget) { | |
2d51013e | 224 | fuse_put_request(fc, req); |
e2a6b952 MS |
225 | ret = -ENOMEM; |
226 | goto out; | |
2d51013e MS |
227 | } |
228 | ||
7dca9fd3 | 229 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 230 | |
e956edd0 | 231 | parent = dget_parent(entry); |
c180eebe MS |
232 | fuse_lookup_init(fc, req, get_node_id(parent->d_inode), |
233 | &entry->d_name, &outarg); | |
b93f858a | 234 | fuse_request_send(fc, req); |
e956edd0 | 235 | dput(parent); |
e5e5558e | 236 | err = req->out.h.error; |
2d51013e | 237 | fuse_put_request(fc, req); |
50322fe7 MS |
238 | /* Zero nodeid is same as -ENOENT */ |
239 | if (!err && !outarg.nodeid) | |
240 | err = -ENOENT; | |
9e6268db | 241 | if (!err) { |
6314efee | 242 | fi = get_fuse_inode(inode); |
9e6268db | 243 | if (outarg.nodeid != get_node_id(inode)) { |
07e77dca | 244 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
e2a6b952 | 245 | goto invalid; |
9e6268db | 246 | } |
8da5ff23 | 247 | spin_lock(&fc->lock); |
1729a16c | 248 | fi->nlookup++; |
8da5ff23 | 249 | spin_unlock(&fc->lock); |
9e6268db | 250 | } |
07e77dca | 251 | kfree(forget); |
9e6268db | 252 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e2a6b952 | 253 | goto invalid; |
e5e5558e | 254 | |
1fb69e78 MS |
255 | fuse_change_attributes(inode, &outarg.attr, |
256 | entry_attr_timeout(&outarg), | |
257 | attr_version); | |
258 | fuse_change_entry_timeout(entry, &outarg); | |
28420dad | 259 | } else if (inode) { |
6314efee MS |
260 | fi = get_fuse_inode(inode); |
261 | if (flags & LOOKUP_RCU) { | |
262 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) | |
263 | return -ECHILD; | |
264 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { | |
28420dad MS |
265 | parent = dget_parent(entry); |
266 | fuse_advise_use_readdirplus(parent->d_inode); | |
267 | dput(parent); | |
268 | } | |
e5e5558e | 269 | } |
e2a6b952 MS |
270 | ret = 1; |
271 | out: | |
272 | return ret; | |
273 | ||
274 | invalid: | |
275 | ret = 0; | |
3c70b8ee MS |
276 | |
277 | if (!(flags & LOOKUP_RCU) && check_submounts_and_drop(entry) != 0) | |
46ea1562 | 278 | ret = 1; |
e2a6b952 | 279 | goto out; |
e5e5558e MS |
280 | } |
281 | ||
8bfc016d | 282 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
283 | { |
284 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
285 | } | |
286 | ||
4269590a | 287 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e MS |
288 | .d_revalidate = fuse_dentry_revalidate, |
289 | }; | |
290 | ||
a5bfffac | 291 | int fuse_valid_type(int m) |
39ee059a MS |
292 | { |
293 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
294 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
295 | } | |
296 | ||
c180eebe MS |
297 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, |
298 | struct fuse_entry_out *outarg, struct inode **inode) | |
e5e5558e | 299 | { |
c180eebe | 300 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
e5e5558e | 301 | struct fuse_req *req; |
07e77dca | 302 | struct fuse_forget_link *forget; |
1fb69e78 | 303 | u64 attr_version; |
c180eebe | 304 | int err; |
e5e5558e | 305 | |
c180eebe MS |
306 | *inode = NULL; |
307 | err = -ENAMETOOLONG; | |
308 | if (name->len > FUSE_NAME_MAX) | |
309 | goto out; | |
e5e5558e | 310 | |
b111c8c0 | 311 | req = fuse_get_req_nopages(fc); |
c180eebe | 312 | err = PTR_ERR(req); |
ce1d5a49 | 313 | if (IS_ERR(req)) |
c180eebe | 314 | goto out; |
e5e5558e | 315 | |
07e77dca MS |
316 | forget = fuse_alloc_forget(); |
317 | err = -ENOMEM; | |
318 | if (!forget) { | |
2d51013e | 319 | fuse_put_request(fc, req); |
c180eebe | 320 | goto out; |
2d51013e MS |
321 | } |
322 | ||
7dca9fd3 | 323 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 324 | |
c180eebe | 325 | fuse_lookup_init(fc, req, nodeid, name, outarg); |
b93f858a | 326 | fuse_request_send(fc, req); |
e5e5558e | 327 | err = req->out.h.error; |
2d51013e | 328 | fuse_put_request(fc, req); |
50322fe7 | 329 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
330 | if (err || !outarg->nodeid) |
331 | goto out_put_forget; | |
332 | ||
333 | err = -EIO; | |
334 | if (!outarg->nodeid) | |
335 | goto out_put_forget; | |
336 | if (!fuse_valid_type(outarg->attr.mode)) | |
337 | goto out_put_forget; | |
338 | ||
339 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
340 | &outarg->attr, entry_attr_timeout(outarg), | |
341 | attr_version); | |
342 | err = -ENOMEM; | |
343 | if (!*inode) { | |
07e77dca | 344 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
c180eebe | 345 | goto out; |
e5e5558e | 346 | } |
c180eebe MS |
347 | err = 0; |
348 | ||
349 | out_put_forget: | |
07e77dca | 350 | kfree(forget); |
c180eebe MS |
351 | out: |
352 | return err; | |
353 | } | |
354 | ||
355 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 356 | unsigned int flags) |
c180eebe MS |
357 | { |
358 | int err; | |
359 | struct fuse_entry_out outarg; | |
360 | struct inode *inode; | |
361 | struct dentry *newent; | |
c180eebe MS |
362 | bool outarg_valid = true; |
363 | ||
364 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, | |
365 | &outarg, &inode); | |
366 | if (err == -ENOENT) { | |
367 | outarg_valid = false; | |
368 | err = 0; | |
369 | } | |
370 | if (err) | |
371 | goto out_err; | |
372 | ||
373 | err = -EIO; | |
374 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
375 | goto out_iput; | |
e5e5558e | 376 | |
b70a80e7 | 377 | newent = d_materialise_unique(entry, inode); |
5835f339 MS |
378 | err = PTR_ERR(newent); |
379 | if (IS_ERR(newent)) | |
380 | goto out_err; | |
d2a85164 | 381 | |
0de6256d | 382 | entry = newent ? newent : entry; |
c180eebe | 383 | if (outarg_valid) |
1fb69e78 | 384 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
385 | else |
386 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 387 | |
4582a4ab | 388 | fuse_advise_use_readdirplus(dir); |
0de6256d | 389 | return newent; |
c180eebe MS |
390 | |
391 | out_iput: | |
392 | iput(inode); | |
393 | out_err: | |
394 | return ERR_PTR(err); | |
e5e5558e MS |
395 | } |
396 | ||
6f9f1180 MS |
397 | /* |
398 | * Atomic create+open operation | |
399 | * | |
400 | * If the filesystem doesn't support this, then fall back to separate | |
401 | * 'mknod' + 'open' requests. | |
402 | */ | |
d9585277 | 403 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 404 | struct file *file, unsigned flags, |
d9585277 | 405 | umode_t mode, int *opened) |
fd72faac MS |
406 | { |
407 | int err; | |
408 | struct inode *inode; | |
409 | struct fuse_conn *fc = get_fuse_conn(dir); | |
410 | struct fuse_req *req; | |
07e77dca | 411 | struct fuse_forget_link *forget; |
e0a43ddc | 412 | struct fuse_create_in inarg; |
fd72faac MS |
413 | struct fuse_open_out outopen; |
414 | struct fuse_entry_out outentry; | |
fd72faac | 415 | struct fuse_file *ff; |
fd72faac | 416 | |
af109bca MS |
417 | /* Userspace expects S_IFREG in create mode */ |
418 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
419 | ||
07e77dca | 420 | forget = fuse_alloc_forget(); |
c8ccbe03 | 421 | err = -ENOMEM; |
07e77dca | 422 | if (!forget) |
c8ccbe03 | 423 | goto out_err; |
51eb01e7 | 424 | |
b111c8c0 | 425 | req = fuse_get_req_nopages(fc); |
51eb01e7 | 426 | err = PTR_ERR(req); |
ce1d5a49 | 427 | if (IS_ERR(req)) |
51eb01e7 | 428 | goto out_put_forget_req; |
fd72faac | 429 | |
ce1d5a49 | 430 | err = -ENOMEM; |
acf99433 | 431 | ff = fuse_file_alloc(fc); |
fd72faac MS |
432 | if (!ff) |
433 | goto out_put_request; | |
434 | ||
e0a43ddc MS |
435 | if (!fc->dont_mask) |
436 | mode &= ~current_umask(); | |
437 | ||
fd72faac MS |
438 | flags &= ~O_NOCTTY; |
439 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 440 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
441 | inarg.flags = flags; |
442 | inarg.mode = mode; | |
e0a43ddc | 443 | inarg.umask = current_umask(); |
fd72faac MS |
444 | req->in.h.opcode = FUSE_CREATE; |
445 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac | 446 | req->in.numargs = 2; |
e0a43ddc MS |
447 | req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : |
448 | sizeof(inarg); | |
fd72faac MS |
449 | req->in.args[0].value = &inarg; |
450 | req->in.args[1].size = entry->d_name.len + 1; | |
451 | req->in.args[1].value = entry->d_name.name; | |
452 | req->out.numargs = 2; | |
0e9663ee MS |
453 | if (fc->minor < 9) |
454 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
455 | else | |
456 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
457 | req->out.args[0].value = &outentry; |
458 | req->out.args[1].size = sizeof(outopen); | |
459 | req->out.args[1].value = &outopen; | |
b93f858a | 460 | fuse_request_send(fc, req); |
fd72faac | 461 | err = req->out.h.error; |
c8ccbe03 | 462 | if (err) |
fd72faac | 463 | goto out_free_ff; |
fd72faac MS |
464 | |
465 | err = -EIO; | |
2827d0b2 | 466 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
467 | goto out_free_ff; |
468 | ||
51eb01e7 | 469 | fuse_put_request(fc, req); |
c7b7143c MS |
470 | ff->fh = outopen.fh; |
471 | ff->nodeid = outentry.nodeid; | |
472 | ff->open_flags = outopen.open_flags; | |
fd72faac | 473 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 474 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
475 | if (!inode) { |
476 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 477 | fuse_sync_release(ff, flags); |
07e77dca | 478 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
479 | err = -ENOMEM; |
480 | goto out_err; | |
fd72faac | 481 | } |
07e77dca | 482 | kfree(forget); |
fd72faac | 483 | d_instantiate(entry, inode); |
1fb69e78 | 484 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 485 | fuse_invalidate_attr(dir); |
30d90494 AV |
486 | err = finish_open(file, entry, generic_file_open, opened); |
487 | if (err) { | |
8b0797a4 | 488 | fuse_sync_release(ff, flags); |
c8ccbe03 MS |
489 | } else { |
490 | file->private_data = fuse_file_get(ff); | |
491 | fuse_finish_open(inode, file); | |
fd72faac | 492 | } |
d9585277 | 493 | return err; |
fd72faac | 494 | |
c8ccbe03 | 495 | out_free_ff: |
fd72faac | 496 | fuse_file_free(ff); |
c8ccbe03 | 497 | out_put_request: |
fd72faac | 498 | fuse_put_request(fc, req); |
c8ccbe03 | 499 | out_put_forget_req: |
07e77dca | 500 | kfree(forget); |
c8ccbe03 | 501 | out_err: |
d9585277 | 502 | return err; |
c8ccbe03 MS |
503 | } |
504 | ||
505 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 506 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 507 | struct file *file, unsigned flags, |
d9585277 | 508 | umode_t mode, int *opened) |
c8ccbe03 MS |
509 | { |
510 | int err; | |
511 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
512 | struct dentry *res = NULL; |
513 | ||
514 | if (d_unhashed(entry)) { | |
00cd8dd3 | 515 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 516 | if (IS_ERR(res)) |
d9585277 | 517 | return PTR_ERR(res); |
c8ccbe03 MS |
518 | |
519 | if (res) | |
520 | entry = res; | |
521 | } | |
522 | ||
523 | if (!(flags & O_CREAT) || entry->d_inode) | |
524 | goto no_open; | |
525 | ||
526 | /* Only creates */ | |
47237687 | 527 | *opened |= FILE_CREATED; |
c8ccbe03 MS |
528 | |
529 | if (fc->no_create) | |
530 | goto mknod; | |
531 | ||
30d90494 | 532 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
d9585277 | 533 | if (err == -ENOSYS) { |
c8ccbe03 MS |
534 | fc->no_create = 1; |
535 | goto mknod; | |
536 | } | |
537 | out_dput: | |
538 | dput(res); | |
d9585277 | 539 | return err; |
c8ccbe03 MS |
540 | |
541 | mknod: | |
542 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 543 | if (err) |
c8ccbe03 | 544 | goto out_dput; |
c8ccbe03 | 545 | no_open: |
e45198a6 | 546 | return finish_no_open(file, res); |
fd72faac MS |
547 | } |
548 | ||
6f9f1180 MS |
549 | /* |
550 | * Code shared between mknod, mkdir, symlink and link | |
551 | */ | |
9e6268db MS |
552 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
553 | struct inode *dir, struct dentry *entry, | |
541af6a0 | 554 | umode_t mode) |
9e6268db MS |
555 | { |
556 | struct fuse_entry_out outarg; | |
557 | struct inode *inode; | |
9e6268db | 558 | int err; |
07e77dca | 559 | struct fuse_forget_link *forget; |
2d51013e | 560 | |
07e77dca MS |
561 | forget = fuse_alloc_forget(); |
562 | if (!forget) { | |
2d51013e | 563 | fuse_put_request(fc, req); |
07e77dca | 564 | return -ENOMEM; |
2d51013e | 565 | } |
9e6268db | 566 | |
0e9663ee | 567 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 568 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 569 | req->out.numargs = 1; |
0e9663ee MS |
570 | if (fc->minor < 9) |
571 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
572 | else | |
573 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 574 | req->out.args[0].value = &outarg; |
b93f858a | 575 | fuse_request_send(fc, req); |
9e6268db | 576 | err = req->out.h.error; |
2d51013e MS |
577 | fuse_put_request(fc, req); |
578 | if (err) | |
579 | goto out_put_forget_req; | |
580 | ||
39ee059a MS |
581 | err = -EIO; |
582 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 583 | goto out_put_forget_req; |
39ee059a MS |
584 | |
585 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 586 | goto out_put_forget_req; |
39ee059a | 587 | |
9e6268db | 588 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 589 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 590 | if (!inode) { |
07e77dca | 591 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
592 | return -ENOMEM; |
593 | } | |
07e77dca | 594 | kfree(forget); |
9e6268db | 595 | |
b70a80e7 MS |
596 | err = d_instantiate_no_diralias(entry, inode); |
597 | if (err) | |
598 | return err; | |
9e6268db | 599 | |
1fb69e78 | 600 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
601 | fuse_invalidate_attr(dir); |
602 | return 0; | |
39ee059a | 603 | |
2d51013e | 604 | out_put_forget_req: |
07e77dca | 605 | kfree(forget); |
39ee059a | 606 | return err; |
9e6268db MS |
607 | } |
608 | ||
1a67aafb | 609 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
610 | dev_t rdev) |
611 | { | |
612 | struct fuse_mknod_in inarg; | |
613 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 614 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
615 | if (IS_ERR(req)) |
616 | return PTR_ERR(req); | |
9e6268db | 617 | |
e0a43ddc MS |
618 | if (!fc->dont_mask) |
619 | mode &= ~current_umask(); | |
620 | ||
9e6268db MS |
621 | memset(&inarg, 0, sizeof(inarg)); |
622 | inarg.mode = mode; | |
623 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 624 | inarg.umask = current_umask(); |
9e6268db MS |
625 | req->in.h.opcode = FUSE_MKNOD; |
626 | req->in.numargs = 2; | |
e0a43ddc MS |
627 | req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : |
628 | sizeof(inarg); | |
9e6268db MS |
629 | req->in.args[0].value = &inarg; |
630 | req->in.args[1].size = entry->d_name.len + 1; | |
631 | req->in.args[1].value = entry->d_name.name; | |
632 | return create_new_entry(fc, req, dir, entry, mode); | |
633 | } | |
634 | ||
4acdaf27 | 635 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
ebfc3b49 | 636 | bool excl) |
9e6268db MS |
637 | { |
638 | return fuse_mknod(dir, entry, mode, 0); | |
639 | } | |
640 | ||
18bb1db3 | 641 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
642 | { |
643 | struct fuse_mkdir_in inarg; | |
644 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 645 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
646 | if (IS_ERR(req)) |
647 | return PTR_ERR(req); | |
9e6268db | 648 | |
e0a43ddc MS |
649 | if (!fc->dont_mask) |
650 | mode &= ~current_umask(); | |
651 | ||
9e6268db MS |
652 | memset(&inarg, 0, sizeof(inarg)); |
653 | inarg.mode = mode; | |
e0a43ddc | 654 | inarg.umask = current_umask(); |
9e6268db MS |
655 | req->in.h.opcode = FUSE_MKDIR; |
656 | req->in.numargs = 2; | |
657 | req->in.args[0].size = sizeof(inarg); | |
658 | req->in.args[0].value = &inarg; | |
659 | req->in.args[1].size = entry->d_name.len + 1; | |
660 | req->in.args[1].value = entry->d_name.name; | |
661 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
662 | } | |
663 | ||
664 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
665 | const char *link) | |
666 | { | |
667 | struct fuse_conn *fc = get_fuse_conn(dir); | |
668 | unsigned len = strlen(link) + 1; | |
b111c8c0 | 669 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
670 | if (IS_ERR(req)) |
671 | return PTR_ERR(req); | |
9e6268db MS |
672 | |
673 | req->in.h.opcode = FUSE_SYMLINK; | |
674 | req->in.numargs = 2; | |
675 | req->in.args[0].size = entry->d_name.len + 1; | |
676 | req->in.args[0].value = entry->d_name.name; | |
677 | req->in.args[1].size = len; | |
678 | req->in.args[1].value = link; | |
679 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
680 | } | |
681 | ||
31f3267b MP |
682 | static inline void fuse_update_ctime(struct inode *inode) |
683 | { | |
684 | if (!IS_NOCMTIME(inode)) { | |
685 | inode->i_ctime = current_fs_time(inode->i_sb); | |
686 | mark_inode_dirty_sync(inode); | |
687 | } | |
688 | } | |
689 | ||
9e6268db MS |
690 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
691 | { | |
692 | int err; | |
693 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 694 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
695 | if (IS_ERR(req)) |
696 | return PTR_ERR(req); | |
9e6268db MS |
697 | |
698 | req->in.h.opcode = FUSE_UNLINK; | |
699 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
700 | req->in.numargs = 1; |
701 | req->in.args[0].size = entry->d_name.len + 1; | |
702 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 703 | fuse_request_send(fc, req); |
9e6268db MS |
704 | err = req->out.h.error; |
705 | fuse_put_request(fc, req); | |
706 | if (!err) { | |
707 | struct inode *inode = entry->d_inode; | |
ac45d613 | 708 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 709 | |
ac45d613 MS |
710 | spin_lock(&fc->lock); |
711 | fi->attr_version = ++fc->attr_version; | |
dfca7ceb MS |
712 | /* |
713 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
714 | * happen if userspace filesystem is careless. It would be | |
715 | * difficult to enforce correct nlink usage so just ignore this | |
716 | * condition here | |
717 | */ | |
718 | if (inode->i_nlink > 0) | |
719 | drop_nlink(inode); | |
ac45d613 | 720 | spin_unlock(&fc->lock); |
9e6268db MS |
721 | fuse_invalidate_attr(inode); |
722 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 723 | fuse_invalidate_entry_cache(entry); |
31f3267b | 724 | fuse_update_ctime(inode); |
9e6268db MS |
725 | } else if (err == -EINTR) |
726 | fuse_invalidate_entry(entry); | |
727 | return err; | |
728 | } | |
729 | ||
730 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
731 | { | |
732 | int err; | |
733 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 734 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
735 | if (IS_ERR(req)) |
736 | return PTR_ERR(req); | |
9e6268db MS |
737 | |
738 | req->in.h.opcode = FUSE_RMDIR; | |
739 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
740 | req->in.numargs = 1; |
741 | req->in.args[0].size = entry->d_name.len + 1; | |
742 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 743 | fuse_request_send(fc, req); |
9e6268db MS |
744 | err = req->out.h.error; |
745 | fuse_put_request(fc, req); | |
746 | if (!err) { | |
ce71ec36 | 747 | clear_nlink(entry->d_inode); |
9e6268db | 748 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 749 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
750 | } else if (err == -EINTR) |
751 | fuse_invalidate_entry(entry); | |
752 | return err; | |
753 | } | |
754 | ||
755 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
756 | struct inode *newdir, struct dentry *newent) | |
757 | { | |
758 | int err; | |
759 | struct fuse_rename_in inarg; | |
760 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
b111c8c0 | 761 | struct fuse_req *req = fuse_get_req_nopages(fc); |
e4eaac06 | 762 | |
ce1d5a49 MS |
763 | if (IS_ERR(req)) |
764 | return PTR_ERR(req); | |
9e6268db MS |
765 | |
766 | memset(&inarg, 0, sizeof(inarg)); | |
767 | inarg.newdir = get_node_id(newdir); | |
768 | req->in.h.opcode = FUSE_RENAME; | |
769 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
770 | req->in.numargs = 3; |
771 | req->in.args[0].size = sizeof(inarg); | |
772 | req->in.args[0].value = &inarg; | |
773 | req->in.args[1].size = oldent->d_name.len + 1; | |
774 | req->in.args[1].value = oldent->d_name.name; | |
775 | req->in.args[2].size = newent->d_name.len + 1; | |
776 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 777 | fuse_request_send(fc, req); |
9e6268db MS |
778 | err = req->out.h.error; |
779 | fuse_put_request(fc, req); | |
780 | if (!err) { | |
08b63307 MS |
781 | /* ctime changes */ |
782 | fuse_invalidate_attr(oldent->d_inode); | |
31f3267b | 783 | fuse_update_ctime(oldent->d_inode); |
08b63307 | 784 | |
9e6268db MS |
785 | fuse_invalidate_attr(olddir); |
786 | if (olddir != newdir) | |
787 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
788 | |
789 | /* newent will end up negative */ | |
5219f346 MS |
790 | if (newent->d_inode) { |
791 | fuse_invalidate_attr(newent->d_inode); | |
8cbdf1e6 | 792 | fuse_invalidate_entry_cache(newent); |
31f3267b | 793 | fuse_update_ctime(newent->d_inode); |
5219f346 | 794 | } |
9e6268db MS |
795 | } else if (err == -EINTR) { |
796 | /* If request was interrupted, DEITY only knows if the | |
797 | rename actually took place. If the invalidation | |
798 | fails (e.g. some process has CWD under the renamed | |
799 | directory), then there can be inconsistency between | |
800 | the dcache and the real filesystem. Tough luck. */ | |
801 | fuse_invalidate_entry(oldent); | |
802 | if (newent->d_inode) | |
803 | fuse_invalidate_entry(newent); | |
804 | } | |
805 | ||
806 | return err; | |
807 | } | |
808 | ||
809 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
810 | struct dentry *newent) | |
811 | { | |
812 | int err; | |
813 | struct fuse_link_in inarg; | |
814 | struct inode *inode = entry->d_inode; | |
815 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 816 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
817 | if (IS_ERR(req)) |
818 | return PTR_ERR(req); | |
9e6268db MS |
819 | |
820 | memset(&inarg, 0, sizeof(inarg)); | |
821 | inarg.oldnodeid = get_node_id(inode); | |
822 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
823 | req->in.numargs = 2; |
824 | req->in.args[0].size = sizeof(inarg); | |
825 | req->in.args[0].value = &inarg; | |
826 | req->in.args[1].size = newent->d_name.len + 1; | |
827 | req->in.args[1].value = newent->d_name.name; | |
828 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
829 | /* Contrary to "normal" filesystems it can happen that link | |
830 | makes two "logical" inodes point to the same "physical" | |
831 | inode. We invalidate the attributes of the old one, so it | |
832 | will reflect changes in the backing inode (link count, | |
833 | etc.) | |
834 | */ | |
ac45d613 MS |
835 | if (!err) { |
836 | struct fuse_inode *fi = get_fuse_inode(inode); | |
837 | ||
838 | spin_lock(&fc->lock); | |
839 | fi->attr_version = ++fc->attr_version; | |
840 | inc_nlink(inode); | |
841 | spin_unlock(&fc->lock); | |
9e6268db | 842 | fuse_invalidate_attr(inode); |
31f3267b | 843 | fuse_update_ctime(inode); |
ac45d613 MS |
844 | } else if (err == -EINTR) { |
845 | fuse_invalidate_attr(inode); | |
846 | } | |
9e6268db MS |
847 | return err; |
848 | } | |
849 | ||
1fb69e78 MS |
850 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
851 | struct kstat *stat) | |
852 | { | |
203627bb | 853 | unsigned int blkbits; |
8373200b PE |
854 | struct fuse_conn *fc = get_fuse_conn(inode); |
855 | ||
856 | /* see the comment in fuse_change_attributes() */ | |
b0aa7606 | 857 | if (fc->writeback_cache && S_ISREG(inode->i_mode)) { |
8373200b | 858 | attr->size = i_size_read(inode); |
b0aa7606 MP |
859 | attr->mtime = inode->i_mtime.tv_sec; |
860 | attr->mtimensec = inode->i_mtime.tv_nsec; | |
31f3267b MP |
861 | attr->ctime = inode->i_ctime.tv_sec; |
862 | attr->ctimensec = inode->i_ctime.tv_nsec; | |
b0aa7606 | 863 | } |
203627bb | 864 | |
1fb69e78 MS |
865 | stat->dev = inode->i_sb->s_dev; |
866 | stat->ino = attr->ino; | |
867 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
868 | stat->nlink = attr->nlink; | |
499dcf20 EB |
869 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
870 | stat->gid = make_kgid(&init_user_ns, attr->gid); | |
1fb69e78 MS |
871 | stat->rdev = inode->i_rdev; |
872 | stat->atime.tv_sec = attr->atime; | |
873 | stat->atime.tv_nsec = attr->atimensec; | |
874 | stat->mtime.tv_sec = attr->mtime; | |
875 | stat->mtime.tv_nsec = attr->mtimensec; | |
876 | stat->ctime.tv_sec = attr->ctime; | |
877 | stat->ctime.tv_nsec = attr->ctimensec; | |
878 | stat->size = attr->size; | |
879 | stat->blocks = attr->blocks; | |
203627bb MS |
880 | |
881 | if (attr->blksize != 0) | |
882 | blkbits = ilog2(attr->blksize); | |
883 | else | |
884 | blkbits = inode->i_sb->s_blocksize_bits; | |
885 | ||
886 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
887 | } |
888 | ||
c79e322f MS |
889 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
890 | struct file *file) | |
e5e5558e MS |
891 | { |
892 | int err; | |
c79e322f MS |
893 | struct fuse_getattr_in inarg; |
894 | struct fuse_attr_out outarg; | |
e5e5558e | 895 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
896 | struct fuse_req *req; |
897 | u64 attr_version; | |
898 | ||
b111c8c0 | 899 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
900 | if (IS_ERR(req)) |
901 | return PTR_ERR(req); | |
e5e5558e | 902 | |
7dca9fd3 | 903 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 904 | |
c79e322f | 905 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 906 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
907 | /* Directories have separate file-handle space */ |
908 | if (file && S_ISREG(inode->i_mode)) { | |
909 | struct fuse_file *ff = file->private_data; | |
910 | ||
911 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
912 | inarg.fh = ff->fh; | |
913 | } | |
e5e5558e MS |
914 | req->in.h.opcode = FUSE_GETATTR; |
915 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
916 | req->in.numargs = 1; |
917 | req->in.args[0].size = sizeof(inarg); | |
918 | req->in.args[0].value = &inarg; | |
e5e5558e | 919 | req->out.numargs = 1; |
0e9663ee MS |
920 | if (fc->minor < 9) |
921 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
922 | else | |
923 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 924 | req->out.args[0].value = &outarg; |
b93f858a | 925 | fuse_request_send(fc, req); |
e5e5558e MS |
926 | err = req->out.h.error; |
927 | fuse_put_request(fc, req); | |
928 | if (!err) { | |
c79e322f | 929 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
930 | make_bad_inode(inode); |
931 | err = -EIO; | |
932 | } else { | |
c79e322f MS |
933 | fuse_change_attributes(inode, &outarg.attr, |
934 | attr_timeout(&outarg), | |
1fb69e78 MS |
935 | attr_version); |
936 | if (stat) | |
c79e322f | 937 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
938 | } |
939 | } | |
940 | return err; | |
941 | } | |
942 | ||
bcb4be80 MS |
943 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
944 | struct file *file, bool *refreshed) | |
945 | { | |
946 | struct fuse_inode *fi = get_fuse_inode(inode); | |
947 | int err; | |
948 | bool r; | |
949 | ||
950 | if (fi->i_time < get_jiffies_64()) { | |
951 | r = true; | |
952 | err = fuse_do_getattr(inode, stat, file); | |
953 | } else { | |
954 | r = false; | |
955 | err = 0; | |
956 | if (stat) { | |
957 | generic_fillattr(inode, stat); | |
958 | stat->mode = fi->orig_i_mode; | |
45c72cd7 | 959 | stat->ino = fi->orig_ino; |
bcb4be80 MS |
960 | } |
961 | } | |
962 | ||
963 | if (refreshed != NULL) | |
964 | *refreshed = r; | |
965 | ||
966 | return err; | |
967 | } | |
968 | ||
3b463ae0 | 969 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 970 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
971 | { |
972 | int err = -ENOTDIR; | |
973 | struct inode *parent; | |
974 | struct dentry *dir; | |
975 | struct dentry *entry; | |
976 | ||
977 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
978 | if (!parent) | |
979 | return -ENOENT; | |
980 | ||
981 | mutex_lock(&parent->i_mutex); | |
982 | if (!S_ISDIR(parent->i_mode)) | |
983 | goto unlock; | |
984 | ||
985 | err = -ENOENT; | |
986 | dir = d_find_alias(parent); | |
987 | if (!dir) | |
988 | goto unlock; | |
989 | ||
990 | entry = d_lookup(dir, name); | |
991 | dput(dir); | |
992 | if (!entry) | |
993 | goto unlock; | |
994 | ||
995 | fuse_invalidate_attr(parent); | |
996 | fuse_invalidate_entry(entry); | |
451d0f59 JM |
997 | |
998 | if (child_nodeid != 0 && entry->d_inode) { | |
999 | mutex_lock(&entry->d_inode->i_mutex); | |
1000 | if (get_node_id(entry->d_inode) != child_nodeid) { | |
1001 | err = -ENOENT; | |
1002 | goto badentry; | |
1003 | } | |
1004 | if (d_mountpoint(entry)) { | |
1005 | err = -EBUSY; | |
1006 | goto badentry; | |
1007 | } | |
1008 | if (S_ISDIR(entry->d_inode->i_mode)) { | |
1009 | shrink_dcache_parent(entry); | |
1010 | if (!simple_empty(entry)) { | |
1011 | err = -ENOTEMPTY; | |
1012 | goto badentry; | |
1013 | } | |
1014 | entry->d_inode->i_flags |= S_DEAD; | |
1015 | } | |
1016 | dont_mount(entry); | |
1017 | clear_nlink(entry->d_inode); | |
1018 | err = 0; | |
1019 | badentry: | |
1020 | mutex_unlock(&entry->d_inode->i_mutex); | |
1021 | if (!err) | |
1022 | d_delete(entry); | |
1023 | } else { | |
1024 | err = 0; | |
1025 | } | |
3b463ae0 | 1026 | dput(entry); |
3b463ae0 JM |
1027 | |
1028 | unlock: | |
1029 | mutex_unlock(&parent->i_mutex); | |
1030 | iput(parent); | |
1031 | return err; | |
1032 | } | |
1033 | ||
87729a55 MS |
1034 | /* |
1035 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1036 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1037 | * means, that the filesystem daemon is able to record the exact |
1038 | * filesystem operations performed, and can also control the behavior | |
1039 | * of the requester process in otherwise impossible ways. For example | |
1040 | * it can delay the operation for arbitrary length of time allowing | |
1041 | * DoS against the requester. | |
1042 | * | |
1043 | * For this reason only those processes can call into the filesystem, | |
1044 | * for which the owner of the mount has ptrace privilege. This | |
1045 | * excludes processes started by other users, suid or sgid processes. | |
1046 | */ | |
c2132c1b | 1047 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1048 | { |
c69e8d9c | 1049 | const struct cred *cred; |
87729a55 | 1050 | |
c69e8d9c | 1051 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
1052 | return 1; |
1053 | ||
c2132c1b | 1054 | cred = current_cred(); |
499dcf20 EB |
1055 | if (uid_eq(cred->euid, fc->user_id) && |
1056 | uid_eq(cred->suid, fc->user_id) && | |
1057 | uid_eq(cred->uid, fc->user_id) && | |
1058 | gid_eq(cred->egid, fc->group_id) && | |
1059 | gid_eq(cred->sgid, fc->group_id) && | |
1060 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1061 | return 1; |
c69e8d9c | 1062 | |
c2132c1b | 1063 | return 0; |
87729a55 MS |
1064 | } |
1065 | ||
31d40d74 MS |
1066 | static int fuse_access(struct inode *inode, int mask) |
1067 | { | |
1068 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1069 | struct fuse_req *req; | |
1070 | struct fuse_access_in inarg; | |
1071 | int err; | |
1072 | ||
698fa1d1 MS |
1073 | BUG_ON(mask & MAY_NOT_BLOCK); |
1074 | ||
31d40d74 MS |
1075 | if (fc->no_access) |
1076 | return 0; | |
1077 | ||
b111c8c0 | 1078 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1079 | if (IS_ERR(req)) |
1080 | return PTR_ERR(req); | |
31d40d74 MS |
1081 | |
1082 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 1083 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
1084 | req->in.h.opcode = FUSE_ACCESS; |
1085 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
1086 | req->in.numargs = 1; |
1087 | req->in.args[0].size = sizeof(inarg); | |
1088 | req->in.args[0].value = &inarg; | |
b93f858a | 1089 | fuse_request_send(fc, req); |
31d40d74 MS |
1090 | err = req->out.h.error; |
1091 | fuse_put_request(fc, req); | |
1092 | if (err == -ENOSYS) { | |
1093 | fc->no_access = 1; | |
1094 | err = 0; | |
1095 | } | |
1096 | return err; | |
1097 | } | |
1098 | ||
10556cb2 | 1099 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1100 | { |
10556cb2 | 1101 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1102 | return -ECHILD; |
1103 | ||
1104 | return fuse_do_getattr(inode, NULL, NULL); | |
1105 | } | |
1106 | ||
6f9f1180 MS |
1107 | /* |
1108 | * Check permission. The two basic access models of FUSE are: | |
1109 | * | |
1110 | * 1) Local access checking ('default_permissions' mount option) based | |
1111 | * on file mode. This is the plain old disk filesystem permission | |
1112 | * modell. | |
1113 | * | |
1114 | * 2) "Remote" access checking, where server is responsible for | |
1115 | * checking permission in each inode operation. An exception to this | |
1116 | * is if ->permission() was invoked from sys_access() in which case an | |
1117 | * access request is sent. Execute permission is still checked | |
1118 | * locally based on file mode. | |
1119 | */ | |
10556cb2 | 1120 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1121 | { |
1122 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1123 | bool refreshed = false; |
1124 | int err = 0; | |
e5e5558e | 1125 | |
c2132c1b | 1126 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1127 | return -EACCES; |
244f6385 MS |
1128 | |
1129 | /* | |
e8e96157 | 1130 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1131 | */ |
e8e96157 MS |
1132 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1133 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
19690ddb MS |
1134 | struct fuse_inode *fi = get_fuse_inode(inode); |
1135 | ||
1136 | if (fi->i_time < get_jiffies_64()) { | |
1137 | refreshed = true; | |
1138 | ||
10556cb2 | 1139 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1140 | if (err) |
1141 | return err; | |
1142 | } | |
244f6385 MS |
1143 | } |
1144 | ||
1145 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
2830ba7f | 1146 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1147 | |
1148 | /* If permission is denied, try to refresh file | |
1149 | attributes. This is also needed, because the root | |
1150 | node will at first have no permissions */ | |
244f6385 | 1151 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1152 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1153 | if (!err) |
2830ba7f | 1154 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1155 | } |
1156 | ||
6f9f1180 MS |
1157 | /* Note: the opposite of the above test does not |
1158 | exist. So if permissions are revoked this won't be | |
1159 | noticed immediately, only after the attribute | |
1160 | timeout has expired */ | |
9cfcac81 | 1161 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1162 | err = fuse_access(inode, mask); |
1163 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1164 | if (!(inode->i_mode & S_IXUGO)) { | |
1165 | if (refreshed) | |
1166 | return -EACCES; | |
1167 | ||
10556cb2 | 1168 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1169 | if (!err && !(inode->i_mode & S_IXUGO)) |
1170 | return -EACCES; | |
1171 | } | |
e5e5558e | 1172 | } |
244f6385 | 1173 | return err; |
e5e5558e MS |
1174 | } |
1175 | ||
1176 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1177 | struct dir_context *ctx) |
e5e5558e MS |
1178 | { |
1179 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1180 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1181 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
e5e5558e MS |
1182 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
1183 | return -EIO; | |
1184 | if (reclen > nbytes) | |
1185 | break; | |
efeb9e60 MS |
1186 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1187 | return -EIO; | |
e5e5558e | 1188 | |
8d3af7f3 AV |
1189 | if (!dir_emit(ctx, dirent->name, dirent->namelen, |
1190 | dirent->ino, dirent->type)) | |
e5e5558e MS |
1191 | break; |
1192 | ||
1193 | buf += reclen; | |
1194 | nbytes -= reclen; | |
8d3af7f3 | 1195 | ctx->pos = dirent->off; |
e5e5558e MS |
1196 | } |
1197 | ||
1198 | return 0; | |
1199 | } | |
1200 | ||
0b05b183 AA |
1201 | static int fuse_direntplus_link(struct file *file, |
1202 | struct fuse_direntplus *direntplus, | |
1203 | u64 attr_version) | |
1204 | { | |
1205 | int err; | |
1206 | struct fuse_entry_out *o = &direntplus->entry_out; | |
1207 | struct fuse_dirent *dirent = &direntplus->dirent; | |
1208 | struct dentry *parent = file->f_path.dentry; | |
1209 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); | |
1210 | struct dentry *dentry; | |
1211 | struct dentry *alias; | |
1212 | struct inode *dir = parent->d_inode; | |
1213 | struct fuse_conn *fc; | |
1214 | struct inode *inode; | |
1215 | ||
1216 | if (!o->nodeid) { | |
1217 | /* | |
1218 | * Unlike in the case of fuse_lookup, zero nodeid does not mean | |
1219 | * ENOENT. Instead, it only means the userspace filesystem did | |
1220 | * not want to return attributes/handle for this entry. | |
1221 | * | |
1222 | * So do nothing. | |
1223 | */ | |
1224 | return 0; | |
1225 | } | |
1226 | ||
1227 | if (name.name[0] == '.') { | |
1228 | /* | |
1229 | * We could potentially refresh the attributes of the directory | |
1230 | * and its parent? | |
1231 | */ | |
1232 | if (name.len == 1) | |
1233 | return 0; | |
1234 | if (name.name[1] == '.' && name.len == 2) | |
1235 | return 0; | |
1236 | } | |
a28ef45c MS |
1237 | |
1238 | if (invalid_nodeid(o->nodeid)) | |
1239 | return -EIO; | |
1240 | if (!fuse_valid_type(o->attr.mode)) | |
1241 | return -EIO; | |
1242 | ||
0b05b183 AA |
1243 | fc = get_fuse_conn(dir); |
1244 | ||
1245 | name.hash = full_name_hash(name.name, name.len); | |
1246 | dentry = d_lookup(parent, &name); | |
53ce9a33 | 1247 | if (dentry) { |
0b05b183 | 1248 | inode = dentry->d_inode; |
53ce9a33 NV |
1249 | if (!inode) { |
1250 | d_drop(dentry); | |
a28ef45c MS |
1251 | } else if (get_node_id(inode) != o->nodeid || |
1252 | ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { | |
53ce9a33 NV |
1253 | err = d_invalidate(dentry); |
1254 | if (err) | |
1255 | goto out; | |
a28ef45c MS |
1256 | } else if (is_bad_inode(inode)) { |
1257 | err = -EIO; | |
1258 | goto out; | |
53ce9a33 | 1259 | } else { |
0b05b183 AA |
1260 | struct fuse_inode *fi; |
1261 | fi = get_fuse_inode(inode); | |
1262 | spin_lock(&fc->lock); | |
1263 | fi->nlookup++; | |
1264 | spin_unlock(&fc->lock); | |
1265 | ||
fa2b7213 MS |
1266 | fuse_change_attributes(inode, &o->attr, |
1267 | entry_attr_timeout(o), | |
1268 | attr_version); | |
1269 | ||
0b05b183 AA |
1270 | /* |
1271 | * The other branch to 'found' comes via fuse_iget() | |
1272 | * which bumps nlookup inside | |
1273 | */ | |
1274 | goto found; | |
1275 | } | |
0b05b183 | 1276 | dput(dentry); |
0b05b183 AA |
1277 | } |
1278 | ||
1279 | dentry = d_alloc(parent, &name); | |
1280 | err = -ENOMEM; | |
1281 | if (!dentry) | |
1282 | goto out; | |
1283 | ||
1284 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, | |
1285 | &o->attr, entry_attr_timeout(o), attr_version); | |
1286 | if (!inode) | |
1287 | goto out; | |
1288 | ||
b70a80e7 | 1289 | alias = d_materialise_unique(dentry, inode); |
5835f339 MS |
1290 | err = PTR_ERR(alias); |
1291 | if (IS_ERR(alias)) | |
1292 | goto out; | |
2914941e | 1293 | |
0b05b183 AA |
1294 | if (alias) { |
1295 | dput(dentry); | |
1296 | dentry = alias; | |
1297 | } | |
1298 | ||
1299 | found: | |
6314efee MS |
1300 | if (fc->readdirplus_auto) |
1301 | set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state); | |
0b05b183 AA |
1302 | fuse_change_entry_timeout(dentry, o); |
1303 | ||
1304 | err = 0; | |
1305 | out: | |
c7263bcd | 1306 | dput(dentry); |
0b05b183 AA |
1307 | return err; |
1308 | } | |
1309 | ||
1310 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1311 | struct dir_context *ctx, u64 attr_version) |
0b05b183 AA |
1312 | { |
1313 | struct fuse_direntplus *direntplus; | |
1314 | struct fuse_dirent *dirent; | |
1315 | size_t reclen; | |
1316 | int over = 0; | |
1317 | int ret; | |
1318 | ||
1319 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { | |
1320 | direntplus = (struct fuse_direntplus *) buf; | |
1321 | dirent = &direntplus->dirent; | |
1322 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); | |
1323 | ||
1324 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1325 | return -EIO; | |
1326 | if (reclen > nbytes) | |
1327 | break; | |
efeb9e60 MS |
1328 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1329 | return -EIO; | |
0b05b183 AA |
1330 | |
1331 | if (!over) { | |
1332 | /* We fill entries into dstbuf only as much as | |
1333 | it can hold. But we still continue iterating | |
1334 | over remaining entries to link them. If not, | |
1335 | we need to send a FORGET for each of those | |
1336 | which we did not link. | |
1337 | */ | |
8d3af7f3 AV |
1338 | over = !dir_emit(ctx, dirent->name, dirent->namelen, |
1339 | dirent->ino, dirent->type); | |
1340 | ctx->pos = dirent->off; | |
0b05b183 AA |
1341 | } |
1342 | ||
1343 | buf += reclen; | |
1344 | nbytes -= reclen; | |
1345 | ||
1346 | ret = fuse_direntplus_link(file, direntplus, attr_version); | |
1347 | if (ret) | |
1348 | fuse_force_forget(file, direntplus->entry_out.nodeid); | |
1349 | } | |
1350 | ||
1351 | return 0; | |
1352 | } | |
1353 | ||
8d3af7f3 | 1354 | static int fuse_readdir(struct file *file, struct dir_context *ctx) |
e5e5558e | 1355 | { |
4582a4ab | 1356 | int plus, err; |
04730fef MS |
1357 | size_t nbytes; |
1358 | struct page *page; | |
496ad9aa | 1359 | struct inode *inode = file_inode(file); |
e5e5558e | 1360 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 | 1361 | struct fuse_req *req; |
0b05b183 | 1362 | u64 attr_version = 0; |
248d86e8 MS |
1363 | |
1364 | if (is_bad_inode(inode)) | |
1365 | return -EIO; | |
1366 | ||
b111c8c0 | 1367 | req = fuse_get_req(fc, 1); |
ce1d5a49 MS |
1368 | if (IS_ERR(req)) |
1369 | return PTR_ERR(req); | |
e5e5558e | 1370 | |
04730fef MS |
1371 | page = alloc_page(GFP_KERNEL); |
1372 | if (!page) { | |
1373 | fuse_put_request(fc, req); | |
1374 | return -ENOMEM; | |
1375 | } | |
4582a4ab | 1376 | |
8d3af7f3 | 1377 | plus = fuse_use_readdirplus(inode, ctx); |
f4975c67 | 1378 | req->out.argpages = 1; |
04730fef MS |
1379 | req->num_pages = 1; |
1380 | req->pages[0] = page; | |
85f40aec | 1381 | req->page_descs[0].length = PAGE_SIZE; |
4582a4ab | 1382 | if (plus) { |
0b05b183 | 1383 | attr_version = fuse_get_attr_version(fc); |
8d3af7f3 | 1384 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1385 | FUSE_READDIRPLUS); |
1386 | } else { | |
8d3af7f3 | 1387 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1388 | FUSE_READDIR); |
1389 | } | |
b93f858a | 1390 | fuse_request_send(fc, req); |
361b1eb5 | 1391 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1392 | err = req->out.h.error; |
1393 | fuse_put_request(fc, req); | |
0b05b183 | 1394 | if (!err) { |
4582a4ab | 1395 | if (plus) { |
0b05b183 | 1396 | err = parse_dirplusfile(page_address(page), nbytes, |
8d3af7f3 | 1397 | file, ctx, |
0b05b183 AA |
1398 | attr_version); |
1399 | } else { | |
1400 | err = parse_dirfile(page_address(page), nbytes, file, | |
8d3af7f3 | 1401 | ctx); |
0b05b183 AA |
1402 | } |
1403 | } | |
e5e5558e | 1404 | |
04730fef | 1405 | __free_page(page); |
451418fc | 1406 | fuse_invalidate_atime(inode); |
04730fef | 1407 | return err; |
e5e5558e MS |
1408 | } |
1409 | ||
1410 | static char *read_link(struct dentry *dentry) | |
1411 | { | |
1412 | struct inode *inode = dentry->d_inode; | |
1413 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 1414 | struct fuse_req *req = fuse_get_req_nopages(fc); |
e5e5558e MS |
1415 | char *link; |
1416 | ||
ce1d5a49 | 1417 | if (IS_ERR(req)) |
e231c2ee | 1418 | return ERR_CAST(req); |
e5e5558e MS |
1419 | |
1420 | link = (char *) __get_free_page(GFP_KERNEL); | |
1421 | if (!link) { | |
1422 | link = ERR_PTR(-ENOMEM); | |
1423 | goto out; | |
1424 | } | |
1425 | req->in.h.opcode = FUSE_READLINK; | |
1426 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1427 | req->out.argvar = 1; |
1428 | req->out.numargs = 1; | |
1429 | req->out.args[0].size = PAGE_SIZE - 1; | |
1430 | req->out.args[0].value = link; | |
b93f858a | 1431 | fuse_request_send(fc, req); |
e5e5558e MS |
1432 | if (req->out.h.error) { |
1433 | free_page((unsigned long) link); | |
1434 | link = ERR_PTR(req->out.h.error); | |
1435 | } else | |
1436 | link[req->out.args[0].size] = '\0'; | |
1437 | out: | |
1438 | fuse_put_request(fc, req); | |
451418fc | 1439 | fuse_invalidate_atime(inode); |
e5e5558e MS |
1440 | return link; |
1441 | } | |
1442 | ||
1443 | static void free_link(char *link) | |
1444 | { | |
1445 | if (!IS_ERR(link)) | |
1446 | free_page((unsigned long) link); | |
1447 | } | |
1448 | ||
1449 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1450 | { | |
1451 | nd_set_link(nd, read_link(dentry)); | |
1452 | return NULL; | |
1453 | } | |
1454 | ||
1455 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1456 | { | |
1457 | free_link(nd_get_link(nd)); | |
1458 | } | |
1459 | ||
1460 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1461 | { | |
91fe96b4 | 1462 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1463 | } |
1464 | ||
1465 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1466 | { | |
8b0797a4 MS |
1467 | fuse_release_common(file, FUSE_RELEASEDIR); |
1468 | ||
1469 | return 0; | |
e5e5558e MS |
1470 | } |
1471 | ||
02c24a82 JB |
1472 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1473 | int datasync) | |
82547981 | 1474 | { |
02c24a82 | 1475 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1476 | } |
1477 | ||
b18da0c5 MS |
1478 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1479 | unsigned long arg) | |
1480 | { | |
1481 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1482 | ||
1483 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1484 | if (fc->minor < 18) | |
1485 | return -ENOTTY; | |
1486 | ||
1487 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1488 | } | |
1489 | ||
1490 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1491 | unsigned long arg) | |
1492 | { | |
1493 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1494 | ||
1495 | if (fc->minor < 18) | |
1496 | return -ENOTTY; | |
1497 | ||
1498 | return fuse_ioctl_common(file, cmd, arg, | |
1499 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1500 | } | |
1501 | ||
b0aa7606 | 1502 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
17637cba MS |
1503 | { |
1504 | /* Always update if mtime is explicitly set */ | |
1505 | if (ivalid & ATTR_MTIME_SET) | |
1506 | return true; | |
1507 | ||
b0aa7606 MP |
1508 | /* Or if kernel i_mtime is the official one */ |
1509 | if (trust_local_mtime) | |
1510 | return true; | |
1511 | ||
17637cba MS |
1512 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
1513 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1514 | return false; | |
1515 | ||
1516 | /* In all other cases update */ | |
1517 | return true; | |
1518 | } | |
1519 | ||
b0aa7606 | 1520 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg, |
3ad22c62 | 1521 | bool trust_local_cmtime) |
9e6268db MS |
1522 | { |
1523 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1524 | |
1525 | if (ivalid & ATTR_MODE) | |
befc649c | 1526 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1527 | if (ivalid & ATTR_UID) |
499dcf20 | 1528 | arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid); |
9e6268db | 1529 | if (ivalid & ATTR_GID) |
499dcf20 | 1530 | arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid); |
9e6268db | 1531 | if (ivalid & ATTR_SIZE) |
befc649c | 1532 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1533 | if (ivalid & ATTR_ATIME) { |
1534 | arg->valid |= FATTR_ATIME; | |
befc649c | 1535 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1536 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1537 | if (!(ivalid & ATTR_ATIME_SET)) | |
1538 | arg->valid |= FATTR_ATIME_NOW; | |
1539 | } | |
3ad22c62 | 1540 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
17637cba | 1541 | arg->valid |= FATTR_MTIME; |
befc649c | 1542 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba | 1543 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
3ad22c62 | 1544 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
17637cba | 1545 | arg->valid |= FATTR_MTIME_NOW; |
befc649c | 1546 | } |
3ad22c62 MP |
1547 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
1548 | arg->valid |= FATTR_CTIME; | |
1549 | arg->ctime = iattr->ia_ctime.tv_sec; | |
1550 | arg->ctimensec = iattr->ia_ctime.tv_nsec; | |
1551 | } | |
9e6268db MS |
1552 | } |
1553 | ||
3be5a52b MS |
1554 | /* |
1555 | * Prevent concurrent writepages on inode | |
1556 | * | |
1557 | * This is done by adding a negative bias to the inode write counter | |
1558 | * and waiting for all pending writes to finish. | |
1559 | */ | |
1560 | void fuse_set_nowrite(struct inode *inode) | |
1561 | { | |
1562 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1563 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1564 | ||
1565 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1566 | ||
1567 | spin_lock(&fc->lock); | |
1568 | BUG_ON(fi->writectr < 0); | |
1569 | fi->writectr += FUSE_NOWRITE; | |
1570 | spin_unlock(&fc->lock); | |
1571 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1572 | } | |
1573 | ||
1574 | /* | |
1575 | * Allow writepages on inode | |
1576 | * | |
1577 | * Remove the bias from the writecounter and send any queued | |
1578 | * writepages. | |
1579 | */ | |
1580 | static void __fuse_release_nowrite(struct inode *inode) | |
1581 | { | |
1582 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1583 | ||
1584 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1585 | fi->writectr = 0; | |
1586 | fuse_flush_writepages(inode); | |
1587 | } | |
1588 | ||
1589 | void fuse_release_nowrite(struct inode *inode) | |
1590 | { | |
1591 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1592 | ||
1593 | spin_lock(&fc->lock); | |
1594 | __fuse_release_nowrite(inode); | |
1595 | spin_unlock(&fc->lock); | |
1596 | } | |
1597 | ||
b0aa7606 MP |
1598 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_req *req, |
1599 | struct inode *inode, | |
1600 | struct fuse_setattr_in *inarg_p, | |
1601 | struct fuse_attr_out *outarg_p) | |
1602 | { | |
1603 | req->in.h.opcode = FUSE_SETATTR; | |
1604 | req->in.h.nodeid = get_node_id(inode); | |
1605 | req->in.numargs = 1; | |
1606 | req->in.args[0].size = sizeof(*inarg_p); | |
1607 | req->in.args[0].value = inarg_p; | |
1608 | req->out.numargs = 1; | |
1609 | if (fc->minor < 9) | |
1610 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1611 | else | |
1612 | req->out.args[0].size = sizeof(*outarg_p); | |
1613 | req->out.args[0].value = outarg_p; | |
1614 | } | |
1615 | ||
1616 | /* | |
1617 | * Flush inode->i_mtime to the server | |
1618 | */ | |
ab9e13f7 | 1619 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
b0aa7606 | 1620 | { |
b0aa7606 | 1621 | struct fuse_conn *fc = get_fuse_conn(inode); |
1e18bda8 | 1622 | struct fuse_req *req; |
b0aa7606 MP |
1623 | struct fuse_setattr_in inarg; |
1624 | struct fuse_attr_out outarg; | |
1625 | int err; | |
1626 | ||
1e18bda8 MS |
1627 | req = fuse_get_req_nopages(fc); |
1628 | if (IS_ERR(req)) | |
1629 | return PTR_ERR(req); | |
b0aa7606 MP |
1630 | |
1631 | memset(&inarg, 0, sizeof(inarg)); | |
1632 | memset(&outarg, 0, sizeof(outarg)); | |
1633 | ||
ab9e13f7 | 1634 | inarg.valid = FATTR_MTIME; |
b0aa7606 MP |
1635 | inarg.mtime = inode->i_mtime.tv_sec; |
1636 | inarg.mtimensec = inode->i_mtime.tv_nsec; | |
ab9e13f7 MP |
1637 | if (fc->minor >= 23) { |
1638 | inarg.valid |= FATTR_CTIME; | |
1639 | inarg.ctime = inode->i_ctime.tv_sec; | |
1640 | inarg.ctimensec = inode->i_ctime.tv_nsec; | |
1641 | } | |
1e18bda8 MS |
1642 | if (ff) { |
1643 | inarg.valid |= FATTR_FH; | |
1644 | inarg.fh = ff->fh; | |
1645 | } | |
b0aa7606 MP |
1646 | fuse_setattr_fill(fc, req, inode, &inarg, &outarg); |
1647 | fuse_request_send(fc, req); | |
1648 | err = req->out.h.error; | |
1649 | fuse_put_request(fc, req); | |
1650 | ||
b0aa7606 MP |
1651 | return err; |
1652 | } | |
1653 | ||
6f9f1180 MS |
1654 | /* |
1655 | * Set attributes, and at the same time refresh them. | |
1656 | * | |
1657 | * Truncation is slightly complicated, because the 'truncate' request | |
1658 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1659 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1660 | * and the actual truncation by hand. | |
6f9f1180 | 1661 | */ |
efb9fa9e MP |
1662 | int fuse_do_setattr(struct inode *inode, struct iattr *attr, |
1663 | struct file *file) | |
9e6268db | 1664 | { |
9e6268db | 1665 | struct fuse_conn *fc = get_fuse_conn(inode); |
06a7c3c2 | 1666 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db MS |
1667 | struct fuse_req *req; |
1668 | struct fuse_setattr_in inarg; | |
1669 | struct fuse_attr_out outarg; | |
3be5a52b | 1670 | bool is_truncate = false; |
8373200b | 1671 | bool is_wb = fc->writeback_cache; |
3be5a52b | 1672 | loff_t oldsize; |
9e6268db | 1673 | int err; |
3ad22c62 | 1674 | bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode); |
9e6268db | 1675 | |
db78b877 CH |
1676 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1677 | attr->ia_valid |= ATTR_FORCE; | |
1678 | ||
1679 | err = inode_change_ok(inode, attr); | |
1680 | if (err) | |
1681 | return err; | |
1e9a4ed9 | 1682 | |
8d56addd MS |
1683 | if (attr->ia_valid & ATTR_OPEN) { |
1684 | if (fc->atomic_o_trunc) | |
1685 | return 0; | |
1686 | file = NULL; | |
1687 | } | |
6ff958ed | 1688 | |
2c27c65e | 1689 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1690 | is_truncate = true; |
9e6268db | 1691 | |
b111c8c0 | 1692 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1693 | if (IS_ERR(req)) |
1694 | return PTR_ERR(req); | |
9e6268db | 1695 | |
06a7c3c2 | 1696 | if (is_truncate) { |
3be5a52b | 1697 | fuse_set_nowrite(inode); |
06a7c3c2 | 1698 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3ad22c62 MP |
1699 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
1700 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; | |
06a7c3c2 | 1701 | } |
3be5a52b | 1702 | |
9e6268db | 1703 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1704 | memset(&outarg, 0, sizeof(outarg)); |
3ad22c62 | 1705 | iattr_to_fattr(attr, &inarg, trust_local_cmtime); |
49d4914f MS |
1706 | if (file) { |
1707 | struct fuse_file *ff = file->private_data; | |
1708 | inarg.valid |= FATTR_FH; | |
1709 | inarg.fh = ff->fh; | |
1710 | } | |
f3332114 MS |
1711 | if (attr->ia_valid & ATTR_SIZE) { |
1712 | /* For mandatory locking in truncate */ | |
1713 | inarg.valid |= FATTR_LOCKOWNER; | |
1714 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1715 | } | |
b0aa7606 | 1716 | fuse_setattr_fill(fc, req, inode, &inarg, &outarg); |
b93f858a | 1717 | fuse_request_send(fc, req); |
9e6268db MS |
1718 | err = req->out.h.error; |
1719 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1720 | if (err) { |
1721 | if (err == -EINTR) | |
1722 | fuse_invalidate_attr(inode); | |
3be5a52b | 1723 | goto error; |
e00d2c2d | 1724 | } |
9e6268db | 1725 | |
e00d2c2d MS |
1726 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1727 | make_bad_inode(inode); | |
3be5a52b MS |
1728 | err = -EIO; |
1729 | goto error; | |
1730 | } | |
1731 | ||
1732 | spin_lock(&fc->lock); | |
b0aa7606 | 1733 | /* the kernel maintains i_mtime locally */ |
3ad22c62 MP |
1734 | if (trust_local_cmtime) { |
1735 | if (attr->ia_valid & ATTR_MTIME) | |
1736 | inode->i_mtime = attr->ia_mtime; | |
1737 | if (attr->ia_valid & ATTR_CTIME) | |
1738 | inode->i_ctime = attr->ia_ctime; | |
1e18bda8 | 1739 | /* FIXME: clear I_DIRTY_SYNC? */ |
b0aa7606 MP |
1740 | } |
1741 | ||
3be5a52b MS |
1742 | fuse_change_attributes_common(inode, &outarg.attr, |
1743 | attr_timeout(&outarg)); | |
1744 | oldsize = inode->i_size; | |
8373200b PE |
1745 | /* see the comment in fuse_change_attributes() */ |
1746 | if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) | |
1747 | i_size_write(inode, outarg.attr.size); | |
3be5a52b MS |
1748 | |
1749 | if (is_truncate) { | |
1750 | /* NOTE: this may release/reacquire fc->lock */ | |
1751 | __fuse_release_nowrite(inode); | |
1752 | } | |
1753 | spin_unlock(&fc->lock); | |
1754 | ||
1755 | /* | |
1756 | * Only call invalidate_inode_pages2() after removing | |
1757 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1758 | */ | |
8373200b PE |
1759 | if ((is_truncate || !is_wb) && |
1760 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1761 | truncate_pagecache(inode, outarg.attr.size); |
3be5a52b | 1762 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1763 | } |
1764 | ||
06a7c3c2 | 1765 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
e00d2c2d | 1766 | return 0; |
3be5a52b MS |
1767 | |
1768 | error: | |
1769 | if (is_truncate) | |
1770 | fuse_release_nowrite(inode); | |
1771 | ||
06a7c3c2 | 1772 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3be5a52b | 1773 | return err; |
9e6268db MS |
1774 | } |
1775 | ||
49d4914f MS |
1776 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1777 | { | |
efb9fa9e MP |
1778 | struct inode *inode = entry->d_inode; |
1779 | ||
1780 | if (!fuse_allow_current_process(get_fuse_conn(inode))) | |
1781 | return -EACCES; | |
1782 | ||
49d4914f | 1783 | if (attr->ia_valid & ATTR_FILE) |
efb9fa9e | 1784 | return fuse_do_setattr(inode, attr, attr->ia_file); |
49d4914f | 1785 | else |
efb9fa9e | 1786 | return fuse_do_setattr(inode, attr, NULL); |
49d4914f MS |
1787 | } |
1788 | ||
e5e5558e MS |
1789 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1790 | struct kstat *stat) | |
1791 | { | |
1792 | struct inode *inode = entry->d_inode; | |
244f6385 | 1793 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1794 | |
c2132c1b | 1795 | if (!fuse_allow_current_process(fc)) |
244f6385 MS |
1796 | return -EACCES; |
1797 | ||
bcb4be80 | 1798 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1799 | } |
1800 | ||
92a8780e MS |
1801 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1802 | const void *value, size_t size, int flags) | |
1803 | { | |
1804 | struct inode *inode = entry->d_inode; | |
1805 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1806 | struct fuse_req *req; | |
1807 | struct fuse_setxattr_in inarg; | |
1808 | int err; | |
1809 | ||
92a8780e MS |
1810 | if (fc->no_setxattr) |
1811 | return -EOPNOTSUPP; | |
1812 | ||
b111c8c0 | 1813 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1814 | if (IS_ERR(req)) |
1815 | return PTR_ERR(req); | |
92a8780e MS |
1816 | |
1817 | memset(&inarg, 0, sizeof(inarg)); | |
1818 | inarg.size = size; | |
1819 | inarg.flags = flags; | |
1820 | req->in.h.opcode = FUSE_SETXATTR; | |
1821 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1822 | req->in.numargs = 3; |
1823 | req->in.args[0].size = sizeof(inarg); | |
1824 | req->in.args[0].value = &inarg; | |
1825 | req->in.args[1].size = strlen(name) + 1; | |
1826 | req->in.args[1].value = name; | |
1827 | req->in.args[2].size = size; | |
1828 | req->in.args[2].value = value; | |
b93f858a | 1829 | fuse_request_send(fc, req); |
92a8780e MS |
1830 | err = req->out.h.error; |
1831 | fuse_put_request(fc, req); | |
1832 | if (err == -ENOSYS) { | |
1833 | fc->no_setxattr = 1; | |
1834 | err = -EOPNOTSUPP; | |
1835 | } | |
31f3267b | 1836 | if (!err) { |
d331a415 | 1837 | fuse_invalidate_attr(inode); |
31f3267b MP |
1838 | fuse_update_ctime(inode); |
1839 | } | |
92a8780e MS |
1840 | return err; |
1841 | } | |
1842 | ||
1843 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1844 | void *value, size_t size) | |
1845 | { | |
1846 | struct inode *inode = entry->d_inode; | |
1847 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1848 | struct fuse_req *req; | |
1849 | struct fuse_getxattr_in inarg; | |
1850 | struct fuse_getxattr_out outarg; | |
1851 | ssize_t ret; | |
1852 | ||
1853 | if (fc->no_getxattr) | |
1854 | return -EOPNOTSUPP; | |
1855 | ||
b111c8c0 | 1856 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1857 | if (IS_ERR(req)) |
1858 | return PTR_ERR(req); | |
92a8780e MS |
1859 | |
1860 | memset(&inarg, 0, sizeof(inarg)); | |
1861 | inarg.size = size; | |
1862 | req->in.h.opcode = FUSE_GETXATTR; | |
1863 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1864 | req->in.numargs = 2; |
1865 | req->in.args[0].size = sizeof(inarg); | |
1866 | req->in.args[0].value = &inarg; | |
1867 | req->in.args[1].size = strlen(name) + 1; | |
1868 | req->in.args[1].value = name; | |
1869 | /* This is really two different operations rolled into one */ | |
1870 | req->out.numargs = 1; | |
1871 | if (size) { | |
1872 | req->out.argvar = 1; | |
1873 | req->out.args[0].size = size; | |
1874 | req->out.args[0].value = value; | |
1875 | } else { | |
1876 | req->out.args[0].size = sizeof(outarg); | |
1877 | req->out.args[0].value = &outarg; | |
1878 | } | |
b93f858a | 1879 | fuse_request_send(fc, req); |
92a8780e MS |
1880 | ret = req->out.h.error; |
1881 | if (!ret) | |
1882 | ret = size ? req->out.args[0].size : outarg.size; | |
1883 | else { | |
1884 | if (ret == -ENOSYS) { | |
1885 | fc->no_getxattr = 1; | |
1886 | ret = -EOPNOTSUPP; | |
1887 | } | |
1888 | } | |
1889 | fuse_put_request(fc, req); | |
1890 | return ret; | |
1891 | } | |
1892 | ||
1893 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1894 | { | |
1895 | struct inode *inode = entry->d_inode; | |
1896 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1897 | struct fuse_req *req; | |
1898 | struct fuse_getxattr_in inarg; | |
1899 | struct fuse_getxattr_out outarg; | |
1900 | ssize_t ret; | |
1901 | ||
c2132c1b | 1902 | if (!fuse_allow_current_process(fc)) |
e57ac683 MS |
1903 | return -EACCES; |
1904 | ||
92a8780e MS |
1905 | if (fc->no_listxattr) |
1906 | return -EOPNOTSUPP; | |
1907 | ||
b111c8c0 | 1908 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1909 | if (IS_ERR(req)) |
1910 | return PTR_ERR(req); | |
92a8780e MS |
1911 | |
1912 | memset(&inarg, 0, sizeof(inarg)); | |
1913 | inarg.size = size; | |
1914 | req->in.h.opcode = FUSE_LISTXATTR; | |
1915 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1916 | req->in.numargs = 1; |
1917 | req->in.args[0].size = sizeof(inarg); | |
1918 | req->in.args[0].value = &inarg; | |
1919 | /* This is really two different operations rolled into one */ | |
1920 | req->out.numargs = 1; | |
1921 | if (size) { | |
1922 | req->out.argvar = 1; | |
1923 | req->out.args[0].size = size; | |
1924 | req->out.args[0].value = list; | |
1925 | } else { | |
1926 | req->out.args[0].size = sizeof(outarg); | |
1927 | req->out.args[0].value = &outarg; | |
1928 | } | |
b93f858a | 1929 | fuse_request_send(fc, req); |
92a8780e MS |
1930 | ret = req->out.h.error; |
1931 | if (!ret) | |
1932 | ret = size ? req->out.args[0].size : outarg.size; | |
1933 | else { | |
1934 | if (ret == -ENOSYS) { | |
1935 | fc->no_listxattr = 1; | |
1936 | ret = -EOPNOTSUPP; | |
1937 | } | |
1938 | } | |
1939 | fuse_put_request(fc, req); | |
1940 | return ret; | |
1941 | } | |
1942 | ||
1943 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1944 | { | |
1945 | struct inode *inode = entry->d_inode; | |
1946 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1947 | struct fuse_req *req; | |
1948 | int err; | |
1949 | ||
1950 | if (fc->no_removexattr) | |
1951 | return -EOPNOTSUPP; | |
1952 | ||
b111c8c0 | 1953 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1954 | if (IS_ERR(req)) |
1955 | return PTR_ERR(req); | |
92a8780e MS |
1956 | |
1957 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1958 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1959 | req->in.numargs = 1; |
1960 | req->in.args[0].size = strlen(name) + 1; | |
1961 | req->in.args[0].value = name; | |
b93f858a | 1962 | fuse_request_send(fc, req); |
92a8780e MS |
1963 | err = req->out.h.error; |
1964 | fuse_put_request(fc, req); | |
1965 | if (err == -ENOSYS) { | |
1966 | fc->no_removexattr = 1; | |
1967 | err = -EOPNOTSUPP; | |
1968 | } | |
31f3267b | 1969 | if (!err) { |
d331a415 | 1970 | fuse_invalidate_attr(inode); |
31f3267b MP |
1971 | fuse_update_ctime(inode); |
1972 | } | |
92a8780e MS |
1973 | return err; |
1974 | } | |
1975 | ||
754661f1 | 1976 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1977 | .lookup = fuse_lookup, |
9e6268db MS |
1978 | .mkdir = fuse_mkdir, |
1979 | .symlink = fuse_symlink, | |
1980 | .unlink = fuse_unlink, | |
1981 | .rmdir = fuse_rmdir, | |
1982 | .rename = fuse_rename, | |
1983 | .link = fuse_link, | |
1984 | .setattr = fuse_setattr, | |
1985 | .create = fuse_create, | |
c8ccbe03 | 1986 | .atomic_open = fuse_atomic_open, |
9e6268db | 1987 | .mknod = fuse_mknod, |
e5e5558e MS |
1988 | .permission = fuse_permission, |
1989 | .getattr = fuse_getattr, | |
92a8780e MS |
1990 | .setxattr = fuse_setxattr, |
1991 | .getxattr = fuse_getxattr, | |
1992 | .listxattr = fuse_listxattr, | |
1993 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1994 | }; |
1995 | ||
4b6f5d20 | 1996 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1997 | .llseek = generic_file_llseek, |
e5e5558e | 1998 | .read = generic_read_dir, |
8d3af7f3 | 1999 | .iterate = fuse_readdir, |
e5e5558e MS |
2000 | .open = fuse_dir_open, |
2001 | .release = fuse_dir_release, | |
82547981 | 2002 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
2003 | .unlocked_ioctl = fuse_dir_ioctl, |
2004 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
2005 | }; |
2006 | ||
754661f1 | 2007 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 2008 | .setattr = fuse_setattr, |
e5e5558e MS |
2009 | .permission = fuse_permission, |
2010 | .getattr = fuse_getattr, | |
92a8780e MS |
2011 | .setxattr = fuse_setxattr, |
2012 | .getxattr = fuse_getxattr, | |
2013 | .listxattr = fuse_listxattr, | |
2014 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
2015 | }; |
2016 | ||
754661f1 | 2017 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 2018 | .setattr = fuse_setattr, |
e5e5558e MS |
2019 | .follow_link = fuse_follow_link, |
2020 | .put_link = fuse_put_link, | |
2021 | .readlink = generic_readlink, | |
2022 | .getattr = fuse_getattr, | |
92a8780e MS |
2023 | .setxattr = fuse_setxattr, |
2024 | .getxattr = fuse_getxattr, | |
2025 | .listxattr = fuse_listxattr, | |
2026 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
2027 | }; |
2028 | ||
2029 | void fuse_init_common(struct inode *inode) | |
2030 | { | |
2031 | inode->i_op = &fuse_common_inode_operations; | |
2032 | } | |
2033 | ||
2034 | void fuse_init_dir(struct inode *inode) | |
2035 | { | |
2036 | inode->i_op = &fuse_dir_inode_operations; | |
2037 | inode->i_fop = &fuse_dir_operations; | |
2038 | } | |
2039 | ||
2040 | void fuse_init_symlink(struct inode *inode) | |
2041 | { | |
2042 | inode->i_op = &fuse_symlink_inode_operations; | |
2043 | } |