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; |
154210cc AA |
201 | else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) || |
202 | (flags & LOOKUP_REVAL)) { | |
e5e5558e | 203 | int err; |
e5e5558e | 204 | struct fuse_entry_out outarg; |
8cbdf1e6 | 205 | struct fuse_req *req; |
07e77dca | 206 | struct fuse_forget_link *forget; |
1fb69e78 | 207 | u64 attr_version; |
8cbdf1e6 | 208 | |
50322fe7 | 209 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 | 210 | if (!inode) |
e2a6b952 | 211 | goto invalid; |
8cbdf1e6 | 212 | |
e2a6b952 | 213 | ret = -ECHILD; |
0b728e19 | 214 | if (flags & LOOKUP_RCU) |
e2a6b952 | 215 | goto out; |
e7c0a167 | 216 | |
8cbdf1e6 | 217 | fc = get_fuse_conn(inode); |
b111c8c0 | 218 | req = fuse_get_req_nopages(fc); |
e2a6b952 | 219 | ret = PTR_ERR(req); |
ce1d5a49 | 220 | if (IS_ERR(req)) |
e2a6b952 | 221 | goto out; |
e5e5558e | 222 | |
07e77dca MS |
223 | forget = fuse_alloc_forget(); |
224 | if (!forget) { | |
2d51013e | 225 | fuse_put_request(fc, req); |
e2a6b952 MS |
226 | ret = -ENOMEM; |
227 | goto out; | |
2d51013e MS |
228 | } |
229 | ||
7dca9fd3 | 230 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 231 | |
e956edd0 | 232 | parent = dget_parent(entry); |
c180eebe MS |
233 | fuse_lookup_init(fc, req, get_node_id(parent->d_inode), |
234 | &entry->d_name, &outarg); | |
b93f858a | 235 | fuse_request_send(fc, req); |
e956edd0 | 236 | dput(parent); |
e5e5558e | 237 | err = req->out.h.error; |
2d51013e | 238 | fuse_put_request(fc, req); |
50322fe7 MS |
239 | /* Zero nodeid is same as -ENOENT */ |
240 | if (!err && !outarg.nodeid) | |
241 | err = -ENOENT; | |
9e6268db | 242 | if (!err) { |
6314efee | 243 | fi = get_fuse_inode(inode); |
9e6268db | 244 | if (outarg.nodeid != get_node_id(inode)) { |
07e77dca | 245 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
e2a6b952 | 246 | goto invalid; |
9e6268db | 247 | } |
8da5ff23 | 248 | spin_lock(&fc->lock); |
1729a16c | 249 | fi->nlookup++; |
8da5ff23 | 250 | spin_unlock(&fc->lock); |
9e6268db | 251 | } |
07e77dca | 252 | kfree(forget); |
9e6268db | 253 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e2a6b952 | 254 | goto invalid; |
e5e5558e | 255 | |
1fb69e78 MS |
256 | fuse_change_attributes(inode, &outarg.attr, |
257 | entry_attr_timeout(&outarg), | |
258 | attr_version); | |
259 | fuse_change_entry_timeout(entry, &outarg); | |
28420dad | 260 | } else if (inode) { |
6314efee MS |
261 | fi = get_fuse_inode(inode); |
262 | if (flags & LOOKUP_RCU) { | |
263 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) | |
264 | return -ECHILD; | |
265 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { | |
28420dad MS |
266 | parent = dget_parent(entry); |
267 | fuse_advise_use_readdirplus(parent->d_inode); | |
268 | dput(parent); | |
269 | } | |
e5e5558e | 270 | } |
e2a6b952 MS |
271 | ret = 1; |
272 | out: | |
273 | return ret; | |
274 | ||
275 | invalid: | |
276 | ret = 0; | |
277 | goto out; | |
e5e5558e MS |
278 | } |
279 | ||
8bfc016d | 280 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
281 | { |
282 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
283 | } | |
284 | ||
4269590a | 285 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e MS |
286 | .d_revalidate = fuse_dentry_revalidate, |
287 | }; | |
288 | ||
a5bfffac | 289 | int fuse_valid_type(int m) |
39ee059a MS |
290 | { |
291 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
292 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
293 | } | |
294 | ||
c180eebe MS |
295 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, |
296 | struct fuse_entry_out *outarg, struct inode **inode) | |
e5e5558e | 297 | { |
c180eebe | 298 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
e5e5558e | 299 | struct fuse_req *req; |
07e77dca | 300 | struct fuse_forget_link *forget; |
1fb69e78 | 301 | u64 attr_version; |
c180eebe | 302 | int err; |
e5e5558e | 303 | |
c180eebe MS |
304 | *inode = NULL; |
305 | err = -ENAMETOOLONG; | |
306 | if (name->len > FUSE_NAME_MAX) | |
307 | goto out; | |
e5e5558e | 308 | |
b111c8c0 | 309 | req = fuse_get_req_nopages(fc); |
c180eebe | 310 | err = PTR_ERR(req); |
ce1d5a49 | 311 | if (IS_ERR(req)) |
c180eebe | 312 | goto out; |
e5e5558e | 313 | |
07e77dca MS |
314 | forget = fuse_alloc_forget(); |
315 | err = -ENOMEM; | |
316 | if (!forget) { | |
2d51013e | 317 | fuse_put_request(fc, req); |
c180eebe | 318 | goto out; |
2d51013e MS |
319 | } |
320 | ||
7dca9fd3 | 321 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 322 | |
c180eebe | 323 | fuse_lookup_init(fc, req, nodeid, name, outarg); |
b93f858a | 324 | fuse_request_send(fc, req); |
e5e5558e | 325 | err = req->out.h.error; |
2d51013e | 326 | fuse_put_request(fc, req); |
50322fe7 | 327 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
328 | if (err || !outarg->nodeid) |
329 | goto out_put_forget; | |
330 | ||
331 | err = -EIO; | |
332 | if (!outarg->nodeid) | |
333 | goto out_put_forget; | |
334 | if (!fuse_valid_type(outarg->attr.mode)) | |
335 | goto out_put_forget; | |
336 | ||
337 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
338 | &outarg->attr, entry_attr_timeout(outarg), | |
339 | attr_version); | |
340 | err = -ENOMEM; | |
341 | if (!*inode) { | |
07e77dca | 342 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
c180eebe | 343 | goto out; |
e5e5558e | 344 | } |
c180eebe MS |
345 | err = 0; |
346 | ||
347 | out_put_forget: | |
07e77dca | 348 | kfree(forget); |
c180eebe MS |
349 | out: |
350 | return err; | |
351 | } | |
352 | ||
353 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 354 | unsigned int flags) |
c180eebe MS |
355 | { |
356 | int err; | |
357 | struct fuse_entry_out outarg; | |
358 | struct inode *inode; | |
359 | struct dentry *newent; | |
c180eebe MS |
360 | bool outarg_valid = true; |
361 | ||
362 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, | |
363 | &outarg, &inode); | |
364 | if (err == -ENOENT) { | |
365 | outarg_valid = false; | |
366 | err = 0; | |
367 | } | |
368 | if (err) | |
369 | goto out_err; | |
370 | ||
371 | err = -EIO; | |
372 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
373 | goto out_iput; | |
e5e5558e | 374 | |
b70a80e7 | 375 | newent = d_materialise_unique(entry, inode); |
5835f339 MS |
376 | err = PTR_ERR(newent); |
377 | if (IS_ERR(newent)) | |
378 | goto out_err; | |
d2a85164 | 379 | |
0de6256d | 380 | entry = newent ? newent : entry; |
c180eebe | 381 | if (outarg_valid) |
1fb69e78 | 382 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
383 | else |
384 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 385 | |
4582a4ab | 386 | fuse_advise_use_readdirplus(dir); |
0de6256d | 387 | return newent; |
c180eebe MS |
388 | |
389 | out_iput: | |
390 | iput(inode); | |
391 | out_err: | |
392 | return ERR_PTR(err); | |
e5e5558e MS |
393 | } |
394 | ||
6f9f1180 MS |
395 | /* |
396 | * Atomic create+open operation | |
397 | * | |
398 | * If the filesystem doesn't support this, then fall back to separate | |
399 | * 'mknod' + 'open' requests. | |
400 | */ | |
d9585277 | 401 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 402 | struct file *file, unsigned flags, |
d9585277 | 403 | umode_t mode, int *opened) |
fd72faac MS |
404 | { |
405 | int err; | |
406 | struct inode *inode; | |
407 | struct fuse_conn *fc = get_fuse_conn(dir); | |
408 | struct fuse_req *req; | |
07e77dca | 409 | struct fuse_forget_link *forget; |
e0a43ddc | 410 | struct fuse_create_in inarg; |
fd72faac MS |
411 | struct fuse_open_out outopen; |
412 | struct fuse_entry_out outentry; | |
fd72faac | 413 | struct fuse_file *ff; |
fd72faac | 414 | |
af109bca MS |
415 | /* Userspace expects S_IFREG in create mode */ |
416 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
417 | ||
07e77dca | 418 | forget = fuse_alloc_forget(); |
c8ccbe03 | 419 | err = -ENOMEM; |
07e77dca | 420 | if (!forget) |
c8ccbe03 | 421 | goto out_err; |
51eb01e7 | 422 | |
b111c8c0 | 423 | req = fuse_get_req_nopages(fc); |
51eb01e7 | 424 | err = PTR_ERR(req); |
ce1d5a49 | 425 | if (IS_ERR(req)) |
51eb01e7 | 426 | goto out_put_forget_req; |
fd72faac | 427 | |
ce1d5a49 | 428 | err = -ENOMEM; |
acf99433 | 429 | ff = fuse_file_alloc(fc); |
fd72faac MS |
430 | if (!ff) |
431 | goto out_put_request; | |
432 | ||
e0a43ddc MS |
433 | if (!fc->dont_mask) |
434 | mode &= ~current_umask(); | |
435 | ||
fd72faac MS |
436 | flags &= ~O_NOCTTY; |
437 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 438 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
439 | inarg.flags = flags; |
440 | inarg.mode = mode; | |
e0a43ddc | 441 | inarg.umask = current_umask(); |
fd72faac MS |
442 | req->in.h.opcode = FUSE_CREATE; |
443 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac | 444 | req->in.numargs = 2; |
e0a43ddc MS |
445 | req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : |
446 | sizeof(inarg); | |
fd72faac MS |
447 | req->in.args[0].value = &inarg; |
448 | req->in.args[1].size = entry->d_name.len + 1; | |
449 | req->in.args[1].value = entry->d_name.name; | |
450 | req->out.numargs = 2; | |
0e9663ee MS |
451 | if (fc->minor < 9) |
452 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
453 | else | |
454 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
455 | req->out.args[0].value = &outentry; |
456 | req->out.args[1].size = sizeof(outopen); | |
457 | req->out.args[1].value = &outopen; | |
b93f858a | 458 | fuse_request_send(fc, req); |
fd72faac | 459 | err = req->out.h.error; |
c8ccbe03 | 460 | if (err) |
fd72faac | 461 | goto out_free_ff; |
fd72faac MS |
462 | |
463 | err = -EIO; | |
2827d0b2 | 464 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
465 | goto out_free_ff; |
466 | ||
51eb01e7 | 467 | fuse_put_request(fc, req); |
c7b7143c MS |
468 | ff->fh = outopen.fh; |
469 | ff->nodeid = outentry.nodeid; | |
470 | ff->open_flags = outopen.open_flags; | |
fd72faac | 471 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 472 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
473 | if (!inode) { |
474 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 475 | fuse_sync_release(ff, flags); |
07e77dca | 476 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
477 | err = -ENOMEM; |
478 | goto out_err; | |
fd72faac | 479 | } |
07e77dca | 480 | kfree(forget); |
fd72faac | 481 | d_instantiate(entry, inode); |
1fb69e78 | 482 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 483 | fuse_invalidate_attr(dir); |
30d90494 AV |
484 | err = finish_open(file, entry, generic_file_open, opened); |
485 | if (err) { | |
8b0797a4 | 486 | fuse_sync_release(ff, flags); |
c8ccbe03 MS |
487 | } else { |
488 | file->private_data = fuse_file_get(ff); | |
489 | fuse_finish_open(inode, file); | |
fd72faac | 490 | } |
d9585277 | 491 | return err; |
fd72faac | 492 | |
c8ccbe03 | 493 | out_free_ff: |
fd72faac | 494 | fuse_file_free(ff); |
c8ccbe03 | 495 | out_put_request: |
fd72faac | 496 | fuse_put_request(fc, req); |
c8ccbe03 | 497 | out_put_forget_req: |
07e77dca | 498 | kfree(forget); |
c8ccbe03 | 499 | out_err: |
d9585277 | 500 | return err; |
c8ccbe03 MS |
501 | } |
502 | ||
503 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 504 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 505 | struct file *file, unsigned flags, |
d9585277 | 506 | umode_t mode, int *opened) |
c8ccbe03 MS |
507 | { |
508 | int err; | |
509 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
510 | struct dentry *res = NULL; |
511 | ||
512 | if (d_unhashed(entry)) { | |
00cd8dd3 | 513 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 514 | if (IS_ERR(res)) |
d9585277 | 515 | return PTR_ERR(res); |
c8ccbe03 MS |
516 | |
517 | if (res) | |
518 | entry = res; | |
519 | } | |
520 | ||
521 | if (!(flags & O_CREAT) || entry->d_inode) | |
522 | goto no_open; | |
523 | ||
524 | /* Only creates */ | |
47237687 | 525 | *opened |= FILE_CREATED; |
c8ccbe03 MS |
526 | |
527 | if (fc->no_create) | |
528 | goto mknod; | |
529 | ||
30d90494 | 530 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
d9585277 | 531 | if (err == -ENOSYS) { |
c8ccbe03 MS |
532 | fc->no_create = 1; |
533 | goto mknod; | |
534 | } | |
535 | out_dput: | |
536 | dput(res); | |
d9585277 | 537 | return err; |
c8ccbe03 MS |
538 | |
539 | mknod: | |
540 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 541 | if (err) |
c8ccbe03 | 542 | goto out_dput; |
c8ccbe03 | 543 | no_open: |
e45198a6 | 544 | return finish_no_open(file, res); |
fd72faac MS |
545 | } |
546 | ||
6f9f1180 MS |
547 | /* |
548 | * Code shared between mknod, mkdir, symlink and link | |
549 | */ | |
9e6268db MS |
550 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
551 | struct inode *dir, struct dentry *entry, | |
541af6a0 | 552 | umode_t mode) |
9e6268db MS |
553 | { |
554 | struct fuse_entry_out outarg; | |
555 | struct inode *inode; | |
9e6268db | 556 | int err; |
07e77dca | 557 | struct fuse_forget_link *forget; |
2d51013e | 558 | |
07e77dca MS |
559 | forget = fuse_alloc_forget(); |
560 | if (!forget) { | |
2d51013e | 561 | fuse_put_request(fc, req); |
07e77dca | 562 | return -ENOMEM; |
2d51013e | 563 | } |
9e6268db | 564 | |
0e9663ee | 565 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 566 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 567 | req->out.numargs = 1; |
0e9663ee MS |
568 | if (fc->minor < 9) |
569 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
570 | else | |
571 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 572 | req->out.args[0].value = &outarg; |
b93f858a | 573 | fuse_request_send(fc, req); |
9e6268db | 574 | err = req->out.h.error; |
2d51013e MS |
575 | fuse_put_request(fc, req); |
576 | if (err) | |
577 | goto out_put_forget_req; | |
578 | ||
39ee059a MS |
579 | err = -EIO; |
580 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 581 | goto out_put_forget_req; |
39ee059a MS |
582 | |
583 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 584 | goto out_put_forget_req; |
39ee059a | 585 | |
9e6268db | 586 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 587 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 588 | if (!inode) { |
07e77dca | 589 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
590 | return -ENOMEM; |
591 | } | |
07e77dca | 592 | kfree(forget); |
9e6268db | 593 | |
b70a80e7 MS |
594 | err = d_instantiate_no_diralias(entry, inode); |
595 | if (err) | |
596 | return err; | |
9e6268db | 597 | |
1fb69e78 | 598 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
599 | fuse_invalidate_attr(dir); |
600 | return 0; | |
39ee059a | 601 | |
2d51013e | 602 | out_put_forget_req: |
07e77dca | 603 | kfree(forget); |
39ee059a | 604 | return err; |
9e6268db MS |
605 | } |
606 | ||
1a67aafb | 607 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
608 | dev_t rdev) |
609 | { | |
610 | struct fuse_mknod_in inarg; | |
611 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 612 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
613 | if (IS_ERR(req)) |
614 | return PTR_ERR(req); | |
9e6268db | 615 | |
e0a43ddc MS |
616 | if (!fc->dont_mask) |
617 | mode &= ~current_umask(); | |
618 | ||
9e6268db MS |
619 | memset(&inarg, 0, sizeof(inarg)); |
620 | inarg.mode = mode; | |
621 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 622 | inarg.umask = current_umask(); |
9e6268db MS |
623 | req->in.h.opcode = FUSE_MKNOD; |
624 | req->in.numargs = 2; | |
e0a43ddc MS |
625 | req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : |
626 | sizeof(inarg); | |
9e6268db MS |
627 | req->in.args[0].value = &inarg; |
628 | req->in.args[1].size = entry->d_name.len + 1; | |
629 | req->in.args[1].value = entry->d_name.name; | |
630 | return create_new_entry(fc, req, dir, entry, mode); | |
631 | } | |
632 | ||
4acdaf27 | 633 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
ebfc3b49 | 634 | bool excl) |
9e6268db MS |
635 | { |
636 | return fuse_mknod(dir, entry, mode, 0); | |
637 | } | |
638 | ||
18bb1db3 | 639 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
640 | { |
641 | struct fuse_mkdir_in inarg; | |
642 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 643 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
644 | if (IS_ERR(req)) |
645 | return PTR_ERR(req); | |
9e6268db | 646 | |
e0a43ddc MS |
647 | if (!fc->dont_mask) |
648 | mode &= ~current_umask(); | |
649 | ||
9e6268db MS |
650 | memset(&inarg, 0, sizeof(inarg)); |
651 | inarg.mode = mode; | |
e0a43ddc | 652 | inarg.umask = current_umask(); |
9e6268db MS |
653 | req->in.h.opcode = FUSE_MKDIR; |
654 | req->in.numargs = 2; | |
655 | req->in.args[0].size = sizeof(inarg); | |
656 | req->in.args[0].value = &inarg; | |
657 | req->in.args[1].size = entry->d_name.len + 1; | |
658 | req->in.args[1].value = entry->d_name.name; | |
659 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
660 | } | |
661 | ||
662 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
663 | const char *link) | |
664 | { | |
665 | struct fuse_conn *fc = get_fuse_conn(dir); | |
666 | unsigned len = strlen(link) + 1; | |
b111c8c0 | 667 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
668 | if (IS_ERR(req)) |
669 | return PTR_ERR(req); | |
9e6268db MS |
670 | |
671 | req->in.h.opcode = FUSE_SYMLINK; | |
672 | req->in.numargs = 2; | |
673 | req->in.args[0].size = entry->d_name.len + 1; | |
674 | req->in.args[0].value = entry->d_name.name; | |
675 | req->in.args[1].size = len; | |
676 | req->in.args[1].value = link; | |
677 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
678 | } | |
679 | ||
31f3267b MP |
680 | static inline void fuse_update_ctime(struct inode *inode) |
681 | { | |
682 | if (!IS_NOCMTIME(inode)) { | |
683 | inode->i_ctime = current_fs_time(inode->i_sb); | |
684 | mark_inode_dirty_sync(inode); | |
685 | } | |
686 | } | |
687 | ||
9e6268db MS |
688 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
689 | { | |
690 | int err; | |
691 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 692 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
693 | if (IS_ERR(req)) |
694 | return PTR_ERR(req); | |
9e6268db MS |
695 | |
696 | req->in.h.opcode = FUSE_UNLINK; | |
697 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
698 | req->in.numargs = 1; |
699 | req->in.args[0].size = entry->d_name.len + 1; | |
700 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 701 | fuse_request_send(fc, req); |
9e6268db MS |
702 | err = req->out.h.error; |
703 | fuse_put_request(fc, req); | |
704 | if (!err) { | |
705 | struct inode *inode = entry->d_inode; | |
ac45d613 | 706 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 707 | |
ac45d613 MS |
708 | spin_lock(&fc->lock); |
709 | fi->attr_version = ++fc->attr_version; | |
dfca7ceb MS |
710 | /* |
711 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
712 | * happen if userspace filesystem is careless. It would be | |
713 | * difficult to enforce correct nlink usage so just ignore this | |
714 | * condition here | |
715 | */ | |
716 | if (inode->i_nlink > 0) | |
717 | drop_nlink(inode); | |
ac45d613 | 718 | spin_unlock(&fc->lock); |
9e6268db MS |
719 | fuse_invalidate_attr(inode); |
720 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 721 | fuse_invalidate_entry_cache(entry); |
31f3267b | 722 | fuse_update_ctime(inode); |
9e6268db MS |
723 | } else if (err == -EINTR) |
724 | fuse_invalidate_entry(entry); | |
725 | return err; | |
726 | } | |
727 | ||
728 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
729 | { | |
730 | int err; | |
731 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 732 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
733 | if (IS_ERR(req)) |
734 | return PTR_ERR(req); | |
9e6268db MS |
735 | |
736 | req->in.h.opcode = FUSE_RMDIR; | |
737 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
738 | req->in.numargs = 1; |
739 | req->in.args[0].size = entry->d_name.len + 1; | |
740 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 741 | fuse_request_send(fc, req); |
9e6268db MS |
742 | err = req->out.h.error; |
743 | fuse_put_request(fc, req); | |
744 | if (!err) { | |
ce71ec36 | 745 | clear_nlink(entry->d_inode); |
9e6268db | 746 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 747 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
748 | } else if (err == -EINTR) |
749 | fuse_invalidate_entry(entry); | |
750 | return err; | |
751 | } | |
752 | ||
1560c974 MS |
753 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
754 | struct inode *newdir, struct dentry *newent, | |
755 | unsigned int flags, int opcode, size_t argsize) | |
9e6268db MS |
756 | { |
757 | int err; | |
1560c974 | 758 | struct fuse_rename2_in inarg; |
9e6268db | 759 | struct fuse_conn *fc = get_fuse_conn(olddir); |
1560c974 | 760 | struct fuse_req *req; |
e4eaac06 | 761 | |
1560c974 | 762 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
763 | if (IS_ERR(req)) |
764 | return PTR_ERR(req); | |
9e6268db | 765 | |
1560c974 | 766 | memset(&inarg, 0, argsize); |
9e6268db | 767 | inarg.newdir = get_node_id(newdir); |
1560c974 MS |
768 | inarg.flags = flags; |
769 | req->in.h.opcode = opcode; | |
9e6268db | 770 | req->in.h.nodeid = get_node_id(olddir); |
9e6268db | 771 | req->in.numargs = 3; |
1560c974 | 772 | req->in.args[0].size = argsize; |
9e6268db MS |
773 | req->in.args[0].value = &inarg; |
774 | req->in.args[1].size = oldent->d_name.len + 1; | |
775 | req->in.args[1].value = oldent->d_name.name; | |
776 | req->in.args[2].size = newent->d_name.len + 1; | |
777 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 778 | fuse_request_send(fc, req); |
9e6268db MS |
779 | err = req->out.h.error; |
780 | fuse_put_request(fc, req); | |
781 | if (!err) { | |
08b63307 MS |
782 | /* ctime changes */ |
783 | fuse_invalidate_attr(oldent->d_inode); | |
31f3267b | 784 | fuse_update_ctime(oldent->d_inode); |
08b63307 | 785 | |
1560c974 MS |
786 | if (flags & RENAME_EXCHANGE) { |
787 | fuse_invalidate_attr(newent->d_inode); | |
788 | fuse_update_ctime(newent->d_inode); | |
789 | } | |
790 | ||
9e6268db MS |
791 | fuse_invalidate_attr(olddir); |
792 | if (olddir != newdir) | |
793 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
794 | |
795 | /* newent will end up negative */ | |
1560c974 | 796 | if (!(flags & RENAME_EXCHANGE) && newent->d_inode) { |
5219f346 | 797 | fuse_invalidate_attr(newent->d_inode); |
8cbdf1e6 | 798 | fuse_invalidate_entry_cache(newent); |
31f3267b | 799 | fuse_update_ctime(newent->d_inode); |
5219f346 | 800 | } |
9e6268db MS |
801 | } else if (err == -EINTR) { |
802 | /* If request was interrupted, DEITY only knows if the | |
803 | rename actually took place. If the invalidation | |
804 | fails (e.g. some process has CWD under the renamed | |
805 | directory), then there can be inconsistency between | |
806 | the dcache and the real filesystem. Tough luck. */ | |
807 | fuse_invalidate_entry(oldent); | |
808 | if (newent->d_inode) | |
809 | fuse_invalidate_entry(newent); | |
810 | } | |
811 | ||
812 | return err; | |
813 | } | |
814 | ||
1560c974 MS |
815 | static int fuse_rename2(struct inode *olddir, struct dentry *oldent, |
816 | struct inode *newdir, struct dentry *newent, | |
817 | unsigned int flags) | |
818 | { | |
819 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
820 | int err; | |
821 | ||
822 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) | |
823 | return -EINVAL; | |
824 | ||
4237ba43 MS |
825 | if (flags) { |
826 | if (fc->no_rename2 || fc->minor < 23) | |
827 | return -EINVAL; | |
1560c974 | 828 | |
4237ba43 MS |
829 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, |
830 | FUSE_RENAME2, | |
831 | sizeof(struct fuse_rename2_in)); | |
832 | if (err == -ENOSYS) { | |
833 | fc->no_rename2 = 1; | |
834 | err = -EINVAL; | |
835 | } | |
836 | } else { | |
837 | err = fuse_rename_common(olddir, oldent, newdir, newent, 0, | |
838 | FUSE_RENAME, | |
839 | sizeof(struct fuse_rename_in)); | |
1560c974 | 840 | } |
4237ba43 | 841 | |
1560c974 | 842 | return err; |
4237ba43 | 843 | } |
1560c974 | 844 | |
9e6268db MS |
845 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
846 | struct dentry *newent) | |
847 | { | |
848 | int err; | |
849 | struct fuse_link_in inarg; | |
850 | struct inode *inode = entry->d_inode; | |
851 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 852 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
853 | if (IS_ERR(req)) |
854 | return PTR_ERR(req); | |
9e6268db MS |
855 | |
856 | memset(&inarg, 0, sizeof(inarg)); | |
857 | inarg.oldnodeid = get_node_id(inode); | |
858 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
859 | req->in.numargs = 2; |
860 | req->in.args[0].size = sizeof(inarg); | |
861 | req->in.args[0].value = &inarg; | |
862 | req->in.args[1].size = newent->d_name.len + 1; | |
863 | req->in.args[1].value = newent->d_name.name; | |
864 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
865 | /* Contrary to "normal" filesystems it can happen that link | |
866 | makes two "logical" inodes point to the same "physical" | |
867 | inode. We invalidate the attributes of the old one, so it | |
868 | will reflect changes in the backing inode (link count, | |
869 | etc.) | |
870 | */ | |
ac45d613 MS |
871 | if (!err) { |
872 | struct fuse_inode *fi = get_fuse_inode(inode); | |
873 | ||
874 | spin_lock(&fc->lock); | |
875 | fi->attr_version = ++fc->attr_version; | |
876 | inc_nlink(inode); | |
877 | spin_unlock(&fc->lock); | |
9e6268db | 878 | fuse_invalidate_attr(inode); |
31f3267b | 879 | fuse_update_ctime(inode); |
ac45d613 MS |
880 | } else if (err == -EINTR) { |
881 | fuse_invalidate_attr(inode); | |
882 | } | |
9e6268db MS |
883 | return err; |
884 | } | |
885 | ||
1fb69e78 MS |
886 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
887 | struct kstat *stat) | |
888 | { | |
203627bb | 889 | unsigned int blkbits; |
8373200b PE |
890 | struct fuse_conn *fc = get_fuse_conn(inode); |
891 | ||
892 | /* see the comment in fuse_change_attributes() */ | |
b0aa7606 | 893 | if (fc->writeback_cache && S_ISREG(inode->i_mode)) { |
8373200b | 894 | attr->size = i_size_read(inode); |
b0aa7606 MP |
895 | attr->mtime = inode->i_mtime.tv_sec; |
896 | attr->mtimensec = inode->i_mtime.tv_nsec; | |
31f3267b MP |
897 | attr->ctime = inode->i_ctime.tv_sec; |
898 | attr->ctimensec = inode->i_ctime.tv_nsec; | |
b0aa7606 | 899 | } |
203627bb | 900 | |
1fb69e78 MS |
901 | stat->dev = inode->i_sb->s_dev; |
902 | stat->ino = attr->ino; | |
903 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
904 | stat->nlink = attr->nlink; | |
499dcf20 EB |
905 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
906 | stat->gid = make_kgid(&init_user_ns, attr->gid); | |
1fb69e78 MS |
907 | stat->rdev = inode->i_rdev; |
908 | stat->atime.tv_sec = attr->atime; | |
909 | stat->atime.tv_nsec = attr->atimensec; | |
910 | stat->mtime.tv_sec = attr->mtime; | |
911 | stat->mtime.tv_nsec = attr->mtimensec; | |
912 | stat->ctime.tv_sec = attr->ctime; | |
913 | stat->ctime.tv_nsec = attr->ctimensec; | |
914 | stat->size = attr->size; | |
915 | stat->blocks = attr->blocks; | |
203627bb MS |
916 | |
917 | if (attr->blksize != 0) | |
918 | blkbits = ilog2(attr->blksize); | |
919 | else | |
920 | blkbits = inode->i_sb->s_blocksize_bits; | |
921 | ||
922 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
923 | } |
924 | ||
c79e322f MS |
925 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
926 | struct file *file) | |
e5e5558e MS |
927 | { |
928 | int err; | |
c79e322f MS |
929 | struct fuse_getattr_in inarg; |
930 | struct fuse_attr_out outarg; | |
e5e5558e | 931 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
932 | struct fuse_req *req; |
933 | u64 attr_version; | |
934 | ||
b111c8c0 | 935 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
936 | if (IS_ERR(req)) |
937 | return PTR_ERR(req); | |
e5e5558e | 938 | |
7dca9fd3 | 939 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 940 | |
c79e322f | 941 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 942 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
943 | /* Directories have separate file-handle space */ |
944 | if (file && S_ISREG(inode->i_mode)) { | |
945 | struct fuse_file *ff = file->private_data; | |
946 | ||
947 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
948 | inarg.fh = ff->fh; | |
949 | } | |
e5e5558e MS |
950 | req->in.h.opcode = FUSE_GETATTR; |
951 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
952 | req->in.numargs = 1; |
953 | req->in.args[0].size = sizeof(inarg); | |
954 | req->in.args[0].value = &inarg; | |
e5e5558e | 955 | req->out.numargs = 1; |
0e9663ee MS |
956 | if (fc->minor < 9) |
957 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
958 | else | |
959 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 960 | req->out.args[0].value = &outarg; |
b93f858a | 961 | fuse_request_send(fc, req); |
e5e5558e MS |
962 | err = req->out.h.error; |
963 | fuse_put_request(fc, req); | |
964 | if (!err) { | |
c79e322f | 965 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
966 | make_bad_inode(inode); |
967 | err = -EIO; | |
968 | } else { | |
c79e322f MS |
969 | fuse_change_attributes(inode, &outarg.attr, |
970 | attr_timeout(&outarg), | |
1fb69e78 MS |
971 | attr_version); |
972 | if (stat) | |
c79e322f | 973 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
974 | } |
975 | } | |
976 | return err; | |
977 | } | |
978 | ||
bcb4be80 MS |
979 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
980 | struct file *file, bool *refreshed) | |
981 | { | |
982 | struct fuse_inode *fi = get_fuse_inode(inode); | |
983 | int err; | |
984 | bool r; | |
985 | ||
126b9d43 | 986 | if (time_before64(fi->i_time, get_jiffies_64())) { |
bcb4be80 MS |
987 | r = true; |
988 | err = fuse_do_getattr(inode, stat, file); | |
989 | } else { | |
990 | r = false; | |
991 | err = 0; | |
992 | if (stat) { | |
993 | generic_fillattr(inode, stat); | |
994 | stat->mode = fi->orig_i_mode; | |
45c72cd7 | 995 | stat->ino = fi->orig_ino; |
bcb4be80 MS |
996 | } |
997 | } | |
998 | ||
999 | if (refreshed != NULL) | |
1000 | *refreshed = r; | |
1001 | ||
1002 | return err; | |
1003 | } | |
1004 | ||
3b463ae0 | 1005 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 1006 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
1007 | { |
1008 | int err = -ENOTDIR; | |
1009 | struct inode *parent; | |
1010 | struct dentry *dir; | |
1011 | struct dentry *entry; | |
1012 | ||
1013 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
1014 | if (!parent) | |
1015 | return -ENOENT; | |
1016 | ||
1017 | mutex_lock(&parent->i_mutex); | |
1018 | if (!S_ISDIR(parent->i_mode)) | |
1019 | goto unlock; | |
1020 | ||
1021 | err = -ENOENT; | |
1022 | dir = d_find_alias(parent); | |
1023 | if (!dir) | |
1024 | goto unlock; | |
1025 | ||
1026 | entry = d_lookup(dir, name); | |
1027 | dput(dir); | |
1028 | if (!entry) | |
1029 | goto unlock; | |
1030 | ||
1031 | fuse_invalidate_attr(parent); | |
1032 | fuse_invalidate_entry(entry); | |
451d0f59 JM |
1033 | |
1034 | if (child_nodeid != 0 && entry->d_inode) { | |
1035 | mutex_lock(&entry->d_inode->i_mutex); | |
1036 | if (get_node_id(entry->d_inode) != child_nodeid) { | |
1037 | err = -ENOENT; | |
1038 | goto badentry; | |
1039 | } | |
1040 | if (d_mountpoint(entry)) { | |
1041 | err = -EBUSY; | |
1042 | goto badentry; | |
1043 | } | |
1044 | if (S_ISDIR(entry->d_inode->i_mode)) { | |
1045 | shrink_dcache_parent(entry); | |
1046 | if (!simple_empty(entry)) { | |
1047 | err = -ENOTEMPTY; | |
1048 | goto badentry; | |
1049 | } | |
1050 | entry->d_inode->i_flags |= S_DEAD; | |
1051 | } | |
1052 | dont_mount(entry); | |
1053 | clear_nlink(entry->d_inode); | |
1054 | err = 0; | |
1055 | badentry: | |
1056 | mutex_unlock(&entry->d_inode->i_mutex); | |
1057 | if (!err) | |
1058 | d_delete(entry); | |
1059 | } else { | |
1060 | err = 0; | |
1061 | } | |
3b463ae0 | 1062 | dput(entry); |
3b463ae0 JM |
1063 | |
1064 | unlock: | |
1065 | mutex_unlock(&parent->i_mutex); | |
1066 | iput(parent); | |
1067 | return err; | |
1068 | } | |
1069 | ||
87729a55 MS |
1070 | /* |
1071 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1072 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1073 | * means, that the filesystem daemon is able to record the exact |
1074 | * filesystem operations performed, and can also control the behavior | |
1075 | * of the requester process in otherwise impossible ways. For example | |
1076 | * it can delay the operation for arbitrary length of time allowing | |
1077 | * DoS against the requester. | |
1078 | * | |
1079 | * For this reason only those processes can call into the filesystem, | |
1080 | * for which the owner of the mount has ptrace privilege. This | |
1081 | * excludes processes started by other users, suid or sgid processes. | |
1082 | */ | |
c2132c1b | 1083 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1084 | { |
c69e8d9c | 1085 | const struct cred *cred; |
87729a55 | 1086 | |
c69e8d9c | 1087 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
1088 | return 1; |
1089 | ||
c2132c1b | 1090 | cred = current_cred(); |
499dcf20 EB |
1091 | if (uid_eq(cred->euid, fc->user_id) && |
1092 | uid_eq(cred->suid, fc->user_id) && | |
1093 | uid_eq(cred->uid, fc->user_id) && | |
1094 | gid_eq(cred->egid, fc->group_id) && | |
1095 | gid_eq(cred->sgid, fc->group_id) && | |
1096 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1097 | return 1; |
c69e8d9c | 1098 | |
c2132c1b | 1099 | return 0; |
87729a55 MS |
1100 | } |
1101 | ||
31d40d74 MS |
1102 | static int fuse_access(struct inode *inode, int mask) |
1103 | { | |
1104 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1105 | struct fuse_req *req; | |
1106 | struct fuse_access_in inarg; | |
1107 | int err; | |
1108 | ||
698fa1d1 MS |
1109 | BUG_ON(mask & MAY_NOT_BLOCK); |
1110 | ||
31d40d74 MS |
1111 | if (fc->no_access) |
1112 | return 0; | |
1113 | ||
b111c8c0 | 1114 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1115 | if (IS_ERR(req)) |
1116 | return PTR_ERR(req); | |
31d40d74 MS |
1117 | |
1118 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 1119 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
1120 | req->in.h.opcode = FUSE_ACCESS; |
1121 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
1122 | req->in.numargs = 1; |
1123 | req->in.args[0].size = sizeof(inarg); | |
1124 | req->in.args[0].value = &inarg; | |
b93f858a | 1125 | fuse_request_send(fc, req); |
31d40d74 MS |
1126 | err = req->out.h.error; |
1127 | fuse_put_request(fc, req); | |
1128 | if (err == -ENOSYS) { | |
1129 | fc->no_access = 1; | |
1130 | err = 0; | |
1131 | } | |
1132 | return err; | |
1133 | } | |
1134 | ||
10556cb2 | 1135 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1136 | { |
10556cb2 | 1137 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1138 | return -ECHILD; |
1139 | ||
1140 | return fuse_do_getattr(inode, NULL, NULL); | |
1141 | } | |
1142 | ||
6f9f1180 MS |
1143 | /* |
1144 | * Check permission. The two basic access models of FUSE are: | |
1145 | * | |
1146 | * 1) Local access checking ('default_permissions' mount option) based | |
1147 | * on file mode. This is the plain old disk filesystem permission | |
1148 | * modell. | |
1149 | * | |
1150 | * 2) "Remote" access checking, where server is responsible for | |
1151 | * checking permission in each inode operation. An exception to this | |
1152 | * is if ->permission() was invoked from sys_access() in which case an | |
1153 | * access request is sent. Execute permission is still checked | |
1154 | * locally based on file mode. | |
1155 | */ | |
10556cb2 | 1156 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1157 | { |
1158 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1159 | bool refreshed = false; |
1160 | int err = 0; | |
e5e5558e | 1161 | |
c2132c1b | 1162 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1163 | return -EACCES; |
244f6385 MS |
1164 | |
1165 | /* | |
e8e96157 | 1166 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1167 | */ |
e8e96157 MS |
1168 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1169 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
19690ddb MS |
1170 | struct fuse_inode *fi = get_fuse_inode(inode); |
1171 | ||
126b9d43 | 1172 | if (time_before64(fi->i_time, get_jiffies_64())) { |
19690ddb MS |
1173 | refreshed = true; |
1174 | ||
10556cb2 | 1175 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1176 | if (err) |
1177 | return err; | |
1178 | } | |
244f6385 MS |
1179 | } |
1180 | ||
1181 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
2830ba7f | 1182 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1183 | |
1184 | /* If permission is denied, try to refresh file | |
1185 | attributes. This is also needed, because the root | |
1186 | node will at first have no permissions */ | |
244f6385 | 1187 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1188 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1189 | if (!err) |
2830ba7f | 1190 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1191 | } |
1192 | ||
6f9f1180 MS |
1193 | /* Note: the opposite of the above test does not |
1194 | exist. So if permissions are revoked this won't be | |
1195 | noticed immediately, only after the attribute | |
1196 | timeout has expired */ | |
9cfcac81 | 1197 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1198 | err = fuse_access(inode, mask); |
1199 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1200 | if (!(inode->i_mode & S_IXUGO)) { | |
1201 | if (refreshed) | |
1202 | return -EACCES; | |
1203 | ||
10556cb2 | 1204 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1205 | if (!err && !(inode->i_mode & S_IXUGO)) |
1206 | return -EACCES; | |
1207 | } | |
e5e5558e | 1208 | } |
244f6385 | 1209 | return err; |
e5e5558e MS |
1210 | } |
1211 | ||
1212 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1213 | struct dir_context *ctx) |
e5e5558e MS |
1214 | { |
1215 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1216 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1217 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
e5e5558e MS |
1218 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
1219 | return -EIO; | |
1220 | if (reclen > nbytes) | |
1221 | break; | |
efeb9e60 MS |
1222 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1223 | return -EIO; | |
e5e5558e | 1224 | |
8d3af7f3 AV |
1225 | if (!dir_emit(ctx, dirent->name, dirent->namelen, |
1226 | dirent->ino, dirent->type)) | |
e5e5558e MS |
1227 | break; |
1228 | ||
1229 | buf += reclen; | |
1230 | nbytes -= reclen; | |
8d3af7f3 | 1231 | ctx->pos = dirent->off; |
e5e5558e MS |
1232 | } |
1233 | ||
1234 | return 0; | |
1235 | } | |
1236 | ||
0b05b183 AA |
1237 | static int fuse_direntplus_link(struct file *file, |
1238 | struct fuse_direntplus *direntplus, | |
1239 | u64 attr_version) | |
1240 | { | |
1241 | int err; | |
1242 | struct fuse_entry_out *o = &direntplus->entry_out; | |
1243 | struct fuse_dirent *dirent = &direntplus->dirent; | |
1244 | struct dentry *parent = file->f_path.dentry; | |
1245 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); | |
1246 | struct dentry *dentry; | |
1247 | struct dentry *alias; | |
1248 | struct inode *dir = parent->d_inode; | |
1249 | struct fuse_conn *fc; | |
1250 | struct inode *inode; | |
1251 | ||
1252 | if (!o->nodeid) { | |
1253 | /* | |
1254 | * Unlike in the case of fuse_lookup, zero nodeid does not mean | |
1255 | * ENOENT. Instead, it only means the userspace filesystem did | |
1256 | * not want to return attributes/handle for this entry. | |
1257 | * | |
1258 | * So do nothing. | |
1259 | */ | |
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | if (name.name[0] == '.') { | |
1264 | /* | |
1265 | * We could potentially refresh the attributes of the directory | |
1266 | * and its parent? | |
1267 | */ | |
1268 | if (name.len == 1) | |
1269 | return 0; | |
1270 | if (name.name[1] == '.' && name.len == 2) | |
1271 | return 0; | |
1272 | } | |
a28ef45c MS |
1273 | |
1274 | if (invalid_nodeid(o->nodeid)) | |
1275 | return -EIO; | |
1276 | if (!fuse_valid_type(o->attr.mode)) | |
1277 | return -EIO; | |
1278 | ||
0b05b183 AA |
1279 | fc = get_fuse_conn(dir); |
1280 | ||
1281 | name.hash = full_name_hash(name.name, name.len); | |
1282 | dentry = d_lookup(parent, &name); | |
53ce9a33 | 1283 | if (dentry) { |
0b05b183 | 1284 | inode = dentry->d_inode; |
53ce9a33 NV |
1285 | if (!inode) { |
1286 | d_drop(dentry); | |
a28ef45c MS |
1287 | } else if (get_node_id(inode) != o->nodeid || |
1288 | ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { | |
5542aa2f | 1289 | d_invalidate(dentry); |
a28ef45c MS |
1290 | } else if (is_bad_inode(inode)) { |
1291 | err = -EIO; | |
1292 | goto out; | |
53ce9a33 | 1293 | } else { |
0b05b183 AA |
1294 | struct fuse_inode *fi; |
1295 | fi = get_fuse_inode(inode); | |
1296 | spin_lock(&fc->lock); | |
1297 | fi->nlookup++; | |
1298 | spin_unlock(&fc->lock); | |
1299 | ||
fa2b7213 MS |
1300 | fuse_change_attributes(inode, &o->attr, |
1301 | entry_attr_timeout(o), | |
1302 | attr_version); | |
1303 | ||
0b05b183 AA |
1304 | /* |
1305 | * The other branch to 'found' comes via fuse_iget() | |
1306 | * which bumps nlookup inside | |
1307 | */ | |
1308 | goto found; | |
1309 | } | |
0b05b183 | 1310 | dput(dentry); |
0b05b183 AA |
1311 | } |
1312 | ||
1313 | dentry = d_alloc(parent, &name); | |
1314 | err = -ENOMEM; | |
1315 | if (!dentry) | |
1316 | goto out; | |
1317 | ||
1318 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, | |
1319 | &o->attr, entry_attr_timeout(o), attr_version); | |
1320 | if (!inode) | |
1321 | goto out; | |
1322 | ||
b70a80e7 | 1323 | alias = d_materialise_unique(dentry, inode); |
5835f339 MS |
1324 | err = PTR_ERR(alias); |
1325 | if (IS_ERR(alias)) | |
1326 | goto out; | |
2914941e | 1327 | |
0b05b183 AA |
1328 | if (alias) { |
1329 | dput(dentry); | |
1330 | dentry = alias; | |
1331 | } | |
1332 | ||
1333 | found: | |
6314efee MS |
1334 | if (fc->readdirplus_auto) |
1335 | set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state); | |
0b05b183 AA |
1336 | fuse_change_entry_timeout(dentry, o); |
1337 | ||
1338 | err = 0; | |
1339 | out: | |
c7263bcd | 1340 | dput(dentry); |
0b05b183 AA |
1341 | return err; |
1342 | } | |
1343 | ||
1344 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1345 | struct dir_context *ctx, u64 attr_version) |
0b05b183 AA |
1346 | { |
1347 | struct fuse_direntplus *direntplus; | |
1348 | struct fuse_dirent *dirent; | |
1349 | size_t reclen; | |
1350 | int over = 0; | |
1351 | int ret; | |
1352 | ||
1353 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { | |
1354 | direntplus = (struct fuse_direntplus *) buf; | |
1355 | dirent = &direntplus->dirent; | |
1356 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); | |
1357 | ||
1358 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1359 | return -EIO; | |
1360 | if (reclen > nbytes) | |
1361 | break; | |
efeb9e60 MS |
1362 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1363 | return -EIO; | |
0b05b183 AA |
1364 | |
1365 | if (!over) { | |
1366 | /* We fill entries into dstbuf only as much as | |
1367 | it can hold. But we still continue iterating | |
1368 | over remaining entries to link them. If not, | |
1369 | we need to send a FORGET for each of those | |
1370 | which we did not link. | |
1371 | */ | |
8d3af7f3 AV |
1372 | over = !dir_emit(ctx, dirent->name, dirent->namelen, |
1373 | dirent->ino, dirent->type); | |
1374 | ctx->pos = dirent->off; | |
0b05b183 AA |
1375 | } |
1376 | ||
1377 | buf += reclen; | |
1378 | nbytes -= reclen; | |
1379 | ||
1380 | ret = fuse_direntplus_link(file, direntplus, attr_version); | |
1381 | if (ret) | |
1382 | fuse_force_forget(file, direntplus->entry_out.nodeid); | |
1383 | } | |
1384 | ||
1385 | return 0; | |
1386 | } | |
1387 | ||
8d3af7f3 | 1388 | static int fuse_readdir(struct file *file, struct dir_context *ctx) |
e5e5558e | 1389 | { |
4582a4ab | 1390 | int plus, err; |
04730fef MS |
1391 | size_t nbytes; |
1392 | struct page *page; | |
496ad9aa | 1393 | struct inode *inode = file_inode(file); |
e5e5558e | 1394 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 | 1395 | struct fuse_req *req; |
0b05b183 | 1396 | u64 attr_version = 0; |
248d86e8 MS |
1397 | |
1398 | if (is_bad_inode(inode)) | |
1399 | return -EIO; | |
1400 | ||
b111c8c0 | 1401 | req = fuse_get_req(fc, 1); |
ce1d5a49 MS |
1402 | if (IS_ERR(req)) |
1403 | return PTR_ERR(req); | |
e5e5558e | 1404 | |
04730fef MS |
1405 | page = alloc_page(GFP_KERNEL); |
1406 | if (!page) { | |
1407 | fuse_put_request(fc, req); | |
1408 | return -ENOMEM; | |
1409 | } | |
4582a4ab | 1410 | |
8d3af7f3 | 1411 | plus = fuse_use_readdirplus(inode, ctx); |
f4975c67 | 1412 | req->out.argpages = 1; |
04730fef MS |
1413 | req->num_pages = 1; |
1414 | req->pages[0] = page; | |
85f40aec | 1415 | req->page_descs[0].length = PAGE_SIZE; |
4582a4ab | 1416 | if (plus) { |
0b05b183 | 1417 | attr_version = fuse_get_attr_version(fc); |
8d3af7f3 | 1418 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1419 | FUSE_READDIRPLUS); |
1420 | } else { | |
8d3af7f3 | 1421 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1422 | FUSE_READDIR); |
1423 | } | |
b93f858a | 1424 | fuse_request_send(fc, req); |
361b1eb5 | 1425 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1426 | err = req->out.h.error; |
1427 | fuse_put_request(fc, req); | |
0b05b183 | 1428 | if (!err) { |
4582a4ab | 1429 | if (plus) { |
0b05b183 | 1430 | err = parse_dirplusfile(page_address(page), nbytes, |
8d3af7f3 | 1431 | file, ctx, |
0b05b183 AA |
1432 | attr_version); |
1433 | } else { | |
1434 | err = parse_dirfile(page_address(page), nbytes, file, | |
8d3af7f3 | 1435 | ctx); |
0b05b183 AA |
1436 | } |
1437 | } | |
e5e5558e | 1438 | |
04730fef | 1439 | __free_page(page); |
451418fc | 1440 | fuse_invalidate_atime(inode); |
04730fef | 1441 | return err; |
e5e5558e MS |
1442 | } |
1443 | ||
1444 | static char *read_link(struct dentry *dentry) | |
1445 | { | |
1446 | struct inode *inode = dentry->d_inode; | |
1447 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 1448 | struct fuse_req *req = fuse_get_req_nopages(fc); |
e5e5558e MS |
1449 | char *link; |
1450 | ||
ce1d5a49 | 1451 | if (IS_ERR(req)) |
e231c2ee | 1452 | return ERR_CAST(req); |
e5e5558e MS |
1453 | |
1454 | link = (char *) __get_free_page(GFP_KERNEL); | |
1455 | if (!link) { | |
1456 | link = ERR_PTR(-ENOMEM); | |
1457 | goto out; | |
1458 | } | |
1459 | req->in.h.opcode = FUSE_READLINK; | |
1460 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1461 | req->out.argvar = 1; |
1462 | req->out.numargs = 1; | |
1463 | req->out.args[0].size = PAGE_SIZE - 1; | |
1464 | req->out.args[0].value = link; | |
b93f858a | 1465 | fuse_request_send(fc, req); |
e5e5558e MS |
1466 | if (req->out.h.error) { |
1467 | free_page((unsigned long) link); | |
1468 | link = ERR_PTR(req->out.h.error); | |
1469 | } else | |
1470 | link[req->out.args[0].size] = '\0'; | |
1471 | out: | |
1472 | fuse_put_request(fc, req); | |
451418fc | 1473 | fuse_invalidate_atime(inode); |
e5e5558e MS |
1474 | return link; |
1475 | } | |
1476 | ||
1477 | static void free_link(char *link) | |
1478 | { | |
1479 | if (!IS_ERR(link)) | |
1480 | free_page((unsigned long) link); | |
1481 | } | |
1482 | ||
1483 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1484 | { | |
1485 | nd_set_link(nd, read_link(dentry)); | |
1486 | return NULL; | |
1487 | } | |
1488 | ||
1489 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1490 | { | |
1491 | free_link(nd_get_link(nd)); | |
1492 | } | |
1493 | ||
1494 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1495 | { | |
91fe96b4 | 1496 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1497 | } |
1498 | ||
1499 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1500 | { | |
8b0797a4 MS |
1501 | fuse_release_common(file, FUSE_RELEASEDIR); |
1502 | ||
1503 | return 0; | |
e5e5558e MS |
1504 | } |
1505 | ||
02c24a82 JB |
1506 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1507 | int datasync) | |
82547981 | 1508 | { |
02c24a82 | 1509 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1510 | } |
1511 | ||
b18da0c5 MS |
1512 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1513 | unsigned long arg) | |
1514 | { | |
1515 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1516 | ||
1517 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1518 | if (fc->minor < 18) | |
1519 | return -ENOTTY; | |
1520 | ||
1521 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1522 | } | |
1523 | ||
1524 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1525 | unsigned long arg) | |
1526 | { | |
1527 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1528 | ||
1529 | if (fc->minor < 18) | |
1530 | return -ENOTTY; | |
1531 | ||
1532 | return fuse_ioctl_common(file, cmd, arg, | |
1533 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1534 | } | |
1535 | ||
b0aa7606 | 1536 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
17637cba MS |
1537 | { |
1538 | /* Always update if mtime is explicitly set */ | |
1539 | if (ivalid & ATTR_MTIME_SET) | |
1540 | return true; | |
1541 | ||
b0aa7606 MP |
1542 | /* Or if kernel i_mtime is the official one */ |
1543 | if (trust_local_mtime) | |
1544 | return true; | |
1545 | ||
17637cba MS |
1546 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
1547 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1548 | return false; | |
1549 | ||
1550 | /* In all other cases update */ | |
1551 | return true; | |
1552 | } | |
1553 | ||
b0aa7606 | 1554 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg, |
3ad22c62 | 1555 | bool trust_local_cmtime) |
9e6268db MS |
1556 | { |
1557 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1558 | |
1559 | if (ivalid & ATTR_MODE) | |
befc649c | 1560 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1561 | if (ivalid & ATTR_UID) |
499dcf20 | 1562 | arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid); |
9e6268db | 1563 | if (ivalid & ATTR_GID) |
499dcf20 | 1564 | arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid); |
9e6268db | 1565 | if (ivalid & ATTR_SIZE) |
befc649c | 1566 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1567 | if (ivalid & ATTR_ATIME) { |
1568 | arg->valid |= FATTR_ATIME; | |
befc649c | 1569 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1570 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1571 | if (!(ivalid & ATTR_ATIME_SET)) | |
1572 | arg->valid |= FATTR_ATIME_NOW; | |
1573 | } | |
3ad22c62 | 1574 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
17637cba | 1575 | arg->valid |= FATTR_MTIME; |
befc649c | 1576 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba | 1577 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
3ad22c62 | 1578 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
17637cba | 1579 | arg->valid |= FATTR_MTIME_NOW; |
befc649c | 1580 | } |
3ad22c62 MP |
1581 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
1582 | arg->valid |= FATTR_CTIME; | |
1583 | arg->ctime = iattr->ia_ctime.tv_sec; | |
1584 | arg->ctimensec = iattr->ia_ctime.tv_nsec; | |
1585 | } | |
9e6268db MS |
1586 | } |
1587 | ||
3be5a52b MS |
1588 | /* |
1589 | * Prevent concurrent writepages on inode | |
1590 | * | |
1591 | * This is done by adding a negative bias to the inode write counter | |
1592 | * and waiting for all pending writes to finish. | |
1593 | */ | |
1594 | void fuse_set_nowrite(struct inode *inode) | |
1595 | { | |
1596 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1597 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1598 | ||
1599 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1600 | ||
1601 | spin_lock(&fc->lock); | |
1602 | BUG_ON(fi->writectr < 0); | |
1603 | fi->writectr += FUSE_NOWRITE; | |
1604 | spin_unlock(&fc->lock); | |
1605 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1606 | } | |
1607 | ||
1608 | /* | |
1609 | * Allow writepages on inode | |
1610 | * | |
1611 | * Remove the bias from the writecounter and send any queued | |
1612 | * writepages. | |
1613 | */ | |
1614 | static void __fuse_release_nowrite(struct inode *inode) | |
1615 | { | |
1616 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1617 | ||
1618 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1619 | fi->writectr = 0; | |
1620 | fuse_flush_writepages(inode); | |
1621 | } | |
1622 | ||
1623 | void fuse_release_nowrite(struct inode *inode) | |
1624 | { | |
1625 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1626 | ||
1627 | spin_lock(&fc->lock); | |
1628 | __fuse_release_nowrite(inode); | |
1629 | spin_unlock(&fc->lock); | |
1630 | } | |
1631 | ||
b0aa7606 MP |
1632 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_req *req, |
1633 | struct inode *inode, | |
1634 | struct fuse_setattr_in *inarg_p, | |
1635 | struct fuse_attr_out *outarg_p) | |
1636 | { | |
1637 | req->in.h.opcode = FUSE_SETATTR; | |
1638 | req->in.h.nodeid = get_node_id(inode); | |
1639 | req->in.numargs = 1; | |
1640 | req->in.args[0].size = sizeof(*inarg_p); | |
1641 | req->in.args[0].value = inarg_p; | |
1642 | req->out.numargs = 1; | |
1643 | if (fc->minor < 9) | |
1644 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1645 | else | |
1646 | req->out.args[0].size = sizeof(*outarg_p); | |
1647 | req->out.args[0].value = outarg_p; | |
1648 | } | |
1649 | ||
1650 | /* | |
1651 | * Flush inode->i_mtime to the server | |
1652 | */ | |
ab9e13f7 | 1653 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
b0aa7606 | 1654 | { |
b0aa7606 | 1655 | struct fuse_conn *fc = get_fuse_conn(inode); |
1e18bda8 | 1656 | struct fuse_req *req; |
b0aa7606 MP |
1657 | struct fuse_setattr_in inarg; |
1658 | struct fuse_attr_out outarg; | |
1659 | int err; | |
1660 | ||
1e18bda8 MS |
1661 | req = fuse_get_req_nopages(fc); |
1662 | if (IS_ERR(req)) | |
1663 | return PTR_ERR(req); | |
b0aa7606 MP |
1664 | |
1665 | memset(&inarg, 0, sizeof(inarg)); | |
1666 | memset(&outarg, 0, sizeof(outarg)); | |
1667 | ||
ab9e13f7 | 1668 | inarg.valid = FATTR_MTIME; |
b0aa7606 MP |
1669 | inarg.mtime = inode->i_mtime.tv_sec; |
1670 | inarg.mtimensec = inode->i_mtime.tv_nsec; | |
ab9e13f7 MP |
1671 | if (fc->minor >= 23) { |
1672 | inarg.valid |= FATTR_CTIME; | |
1673 | inarg.ctime = inode->i_ctime.tv_sec; | |
1674 | inarg.ctimensec = inode->i_ctime.tv_nsec; | |
1675 | } | |
1e18bda8 MS |
1676 | if (ff) { |
1677 | inarg.valid |= FATTR_FH; | |
1678 | inarg.fh = ff->fh; | |
1679 | } | |
b0aa7606 MP |
1680 | fuse_setattr_fill(fc, req, inode, &inarg, &outarg); |
1681 | fuse_request_send(fc, req); | |
1682 | err = req->out.h.error; | |
1683 | fuse_put_request(fc, req); | |
1684 | ||
b0aa7606 MP |
1685 | return err; |
1686 | } | |
1687 | ||
6f9f1180 MS |
1688 | /* |
1689 | * Set attributes, and at the same time refresh them. | |
1690 | * | |
1691 | * Truncation is slightly complicated, because the 'truncate' request | |
1692 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1693 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1694 | * and the actual truncation by hand. | |
6f9f1180 | 1695 | */ |
efb9fa9e MP |
1696 | int fuse_do_setattr(struct inode *inode, struct iattr *attr, |
1697 | struct file *file) | |
9e6268db | 1698 | { |
9e6268db | 1699 | struct fuse_conn *fc = get_fuse_conn(inode); |
06a7c3c2 | 1700 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db MS |
1701 | struct fuse_req *req; |
1702 | struct fuse_setattr_in inarg; | |
1703 | struct fuse_attr_out outarg; | |
3be5a52b | 1704 | bool is_truncate = false; |
8373200b | 1705 | bool is_wb = fc->writeback_cache; |
3be5a52b | 1706 | loff_t oldsize; |
9e6268db | 1707 | int err; |
3ad22c62 | 1708 | bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode); |
9e6268db | 1709 | |
db78b877 CH |
1710 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1711 | attr->ia_valid |= ATTR_FORCE; | |
1712 | ||
1713 | err = inode_change_ok(inode, attr); | |
1714 | if (err) | |
1715 | return err; | |
1e9a4ed9 | 1716 | |
8d56addd MS |
1717 | if (attr->ia_valid & ATTR_OPEN) { |
1718 | if (fc->atomic_o_trunc) | |
1719 | return 0; | |
1720 | file = NULL; | |
1721 | } | |
6ff958ed | 1722 | |
2c27c65e | 1723 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1724 | is_truncate = true; |
9e6268db | 1725 | |
b111c8c0 | 1726 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1727 | if (IS_ERR(req)) |
1728 | return PTR_ERR(req); | |
9e6268db | 1729 | |
06a7c3c2 | 1730 | if (is_truncate) { |
3be5a52b | 1731 | fuse_set_nowrite(inode); |
06a7c3c2 | 1732 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3ad22c62 MP |
1733 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
1734 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; | |
06a7c3c2 | 1735 | } |
3be5a52b | 1736 | |
9e6268db | 1737 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1738 | memset(&outarg, 0, sizeof(outarg)); |
3ad22c62 | 1739 | iattr_to_fattr(attr, &inarg, trust_local_cmtime); |
49d4914f MS |
1740 | if (file) { |
1741 | struct fuse_file *ff = file->private_data; | |
1742 | inarg.valid |= FATTR_FH; | |
1743 | inarg.fh = ff->fh; | |
1744 | } | |
f3332114 MS |
1745 | if (attr->ia_valid & ATTR_SIZE) { |
1746 | /* For mandatory locking in truncate */ | |
1747 | inarg.valid |= FATTR_LOCKOWNER; | |
1748 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1749 | } | |
b0aa7606 | 1750 | fuse_setattr_fill(fc, req, inode, &inarg, &outarg); |
b93f858a | 1751 | fuse_request_send(fc, req); |
9e6268db MS |
1752 | err = req->out.h.error; |
1753 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1754 | if (err) { |
1755 | if (err == -EINTR) | |
1756 | fuse_invalidate_attr(inode); | |
3be5a52b | 1757 | goto error; |
e00d2c2d | 1758 | } |
9e6268db | 1759 | |
e00d2c2d MS |
1760 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1761 | make_bad_inode(inode); | |
3be5a52b MS |
1762 | err = -EIO; |
1763 | goto error; | |
1764 | } | |
1765 | ||
1766 | spin_lock(&fc->lock); | |
b0aa7606 | 1767 | /* the kernel maintains i_mtime locally */ |
3ad22c62 MP |
1768 | if (trust_local_cmtime) { |
1769 | if (attr->ia_valid & ATTR_MTIME) | |
1770 | inode->i_mtime = attr->ia_mtime; | |
1771 | if (attr->ia_valid & ATTR_CTIME) | |
1772 | inode->i_ctime = attr->ia_ctime; | |
1e18bda8 | 1773 | /* FIXME: clear I_DIRTY_SYNC? */ |
b0aa7606 MP |
1774 | } |
1775 | ||
3be5a52b MS |
1776 | fuse_change_attributes_common(inode, &outarg.attr, |
1777 | attr_timeout(&outarg)); | |
1778 | oldsize = inode->i_size; | |
8373200b PE |
1779 | /* see the comment in fuse_change_attributes() */ |
1780 | if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) | |
1781 | i_size_write(inode, outarg.attr.size); | |
3be5a52b MS |
1782 | |
1783 | if (is_truncate) { | |
1784 | /* NOTE: this may release/reacquire fc->lock */ | |
1785 | __fuse_release_nowrite(inode); | |
1786 | } | |
1787 | spin_unlock(&fc->lock); | |
1788 | ||
1789 | /* | |
1790 | * Only call invalidate_inode_pages2() after removing | |
1791 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1792 | */ | |
8373200b PE |
1793 | if ((is_truncate || !is_wb) && |
1794 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1795 | truncate_pagecache(inode, outarg.attr.size); |
3be5a52b | 1796 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1797 | } |
1798 | ||
06a7c3c2 | 1799 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
e00d2c2d | 1800 | return 0; |
3be5a52b MS |
1801 | |
1802 | error: | |
1803 | if (is_truncate) | |
1804 | fuse_release_nowrite(inode); | |
1805 | ||
06a7c3c2 | 1806 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3be5a52b | 1807 | return err; |
9e6268db MS |
1808 | } |
1809 | ||
49d4914f MS |
1810 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1811 | { | |
efb9fa9e MP |
1812 | struct inode *inode = entry->d_inode; |
1813 | ||
1814 | if (!fuse_allow_current_process(get_fuse_conn(inode))) | |
1815 | return -EACCES; | |
1816 | ||
49d4914f | 1817 | if (attr->ia_valid & ATTR_FILE) |
efb9fa9e | 1818 | return fuse_do_setattr(inode, attr, attr->ia_file); |
49d4914f | 1819 | else |
efb9fa9e | 1820 | return fuse_do_setattr(inode, attr, NULL); |
49d4914f MS |
1821 | } |
1822 | ||
e5e5558e MS |
1823 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1824 | struct kstat *stat) | |
1825 | { | |
1826 | struct inode *inode = entry->d_inode; | |
244f6385 | 1827 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1828 | |
c2132c1b | 1829 | if (!fuse_allow_current_process(fc)) |
244f6385 MS |
1830 | return -EACCES; |
1831 | ||
bcb4be80 | 1832 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1833 | } |
1834 | ||
92a8780e MS |
1835 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1836 | const void *value, size_t size, int flags) | |
1837 | { | |
1838 | struct inode *inode = entry->d_inode; | |
1839 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1840 | struct fuse_req *req; | |
1841 | struct fuse_setxattr_in inarg; | |
1842 | int err; | |
1843 | ||
92a8780e MS |
1844 | if (fc->no_setxattr) |
1845 | return -EOPNOTSUPP; | |
1846 | ||
b111c8c0 | 1847 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1848 | if (IS_ERR(req)) |
1849 | return PTR_ERR(req); | |
92a8780e MS |
1850 | |
1851 | memset(&inarg, 0, sizeof(inarg)); | |
1852 | inarg.size = size; | |
1853 | inarg.flags = flags; | |
1854 | req->in.h.opcode = FUSE_SETXATTR; | |
1855 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1856 | req->in.numargs = 3; |
1857 | req->in.args[0].size = sizeof(inarg); | |
1858 | req->in.args[0].value = &inarg; | |
1859 | req->in.args[1].size = strlen(name) + 1; | |
1860 | req->in.args[1].value = name; | |
1861 | req->in.args[2].size = size; | |
1862 | req->in.args[2].value = value; | |
b93f858a | 1863 | fuse_request_send(fc, req); |
92a8780e MS |
1864 | err = req->out.h.error; |
1865 | fuse_put_request(fc, req); | |
1866 | if (err == -ENOSYS) { | |
1867 | fc->no_setxattr = 1; | |
1868 | err = -EOPNOTSUPP; | |
1869 | } | |
31f3267b | 1870 | if (!err) { |
d331a415 | 1871 | fuse_invalidate_attr(inode); |
31f3267b MP |
1872 | fuse_update_ctime(inode); |
1873 | } | |
92a8780e MS |
1874 | return err; |
1875 | } | |
1876 | ||
1877 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1878 | void *value, size_t size) | |
1879 | { | |
1880 | struct inode *inode = entry->d_inode; | |
1881 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1882 | struct fuse_req *req; | |
1883 | struct fuse_getxattr_in inarg; | |
1884 | struct fuse_getxattr_out outarg; | |
1885 | ssize_t ret; | |
1886 | ||
1887 | if (fc->no_getxattr) | |
1888 | return -EOPNOTSUPP; | |
1889 | ||
b111c8c0 | 1890 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1891 | if (IS_ERR(req)) |
1892 | return PTR_ERR(req); | |
92a8780e MS |
1893 | |
1894 | memset(&inarg, 0, sizeof(inarg)); | |
1895 | inarg.size = size; | |
1896 | req->in.h.opcode = FUSE_GETXATTR; | |
1897 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1898 | req->in.numargs = 2; |
1899 | req->in.args[0].size = sizeof(inarg); | |
1900 | req->in.args[0].value = &inarg; | |
1901 | req->in.args[1].size = strlen(name) + 1; | |
1902 | req->in.args[1].value = name; | |
1903 | /* This is really two different operations rolled into one */ | |
1904 | req->out.numargs = 1; | |
1905 | if (size) { | |
1906 | req->out.argvar = 1; | |
1907 | req->out.args[0].size = size; | |
1908 | req->out.args[0].value = value; | |
1909 | } else { | |
1910 | req->out.args[0].size = sizeof(outarg); | |
1911 | req->out.args[0].value = &outarg; | |
1912 | } | |
b93f858a | 1913 | fuse_request_send(fc, req); |
92a8780e MS |
1914 | ret = req->out.h.error; |
1915 | if (!ret) | |
1916 | ret = size ? req->out.args[0].size : outarg.size; | |
1917 | else { | |
1918 | if (ret == -ENOSYS) { | |
1919 | fc->no_getxattr = 1; | |
1920 | ret = -EOPNOTSUPP; | |
1921 | } | |
1922 | } | |
1923 | fuse_put_request(fc, req); | |
1924 | return ret; | |
1925 | } | |
1926 | ||
1927 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1928 | { | |
1929 | struct inode *inode = entry->d_inode; | |
1930 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1931 | struct fuse_req *req; | |
1932 | struct fuse_getxattr_in inarg; | |
1933 | struct fuse_getxattr_out outarg; | |
1934 | ssize_t ret; | |
1935 | ||
c2132c1b | 1936 | if (!fuse_allow_current_process(fc)) |
e57ac683 MS |
1937 | return -EACCES; |
1938 | ||
92a8780e MS |
1939 | if (fc->no_listxattr) |
1940 | return -EOPNOTSUPP; | |
1941 | ||
b111c8c0 | 1942 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1943 | if (IS_ERR(req)) |
1944 | return PTR_ERR(req); | |
92a8780e MS |
1945 | |
1946 | memset(&inarg, 0, sizeof(inarg)); | |
1947 | inarg.size = size; | |
1948 | req->in.h.opcode = FUSE_LISTXATTR; | |
1949 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1950 | req->in.numargs = 1; |
1951 | req->in.args[0].size = sizeof(inarg); | |
1952 | req->in.args[0].value = &inarg; | |
1953 | /* This is really two different operations rolled into one */ | |
1954 | req->out.numargs = 1; | |
1955 | if (size) { | |
1956 | req->out.argvar = 1; | |
1957 | req->out.args[0].size = size; | |
1958 | req->out.args[0].value = list; | |
1959 | } else { | |
1960 | req->out.args[0].size = sizeof(outarg); | |
1961 | req->out.args[0].value = &outarg; | |
1962 | } | |
b93f858a | 1963 | fuse_request_send(fc, req); |
92a8780e MS |
1964 | ret = req->out.h.error; |
1965 | if (!ret) | |
1966 | ret = size ? req->out.args[0].size : outarg.size; | |
1967 | else { | |
1968 | if (ret == -ENOSYS) { | |
1969 | fc->no_listxattr = 1; | |
1970 | ret = -EOPNOTSUPP; | |
1971 | } | |
1972 | } | |
1973 | fuse_put_request(fc, req); | |
1974 | return ret; | |
1975 | } | |
1976 | ||
1977 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1978 | { | |
1979 | struct inode *inode = entry->d_inode; | |
1980 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1981 | struct fuse_req *req; | |
1982 | int err; | |
1983 | ||
1984 | if (fc->no_removexattr) | |
1985 | return -EOPNOTSUPP; | |
1986 | ||
b111c8c0 | 1987 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1988 | if (IS_ERR(req)) |
1989 | return PTR_ERR(req); | |
92a8780e MS |
1990 | |
1991 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1992 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1993 | req->in.numargs = 1; |
1994 | req->in.args[0].size = strlen(name) + 1; | |
1995 | req->in.args[0].value = name; | |
b93f858a | 1996 | fuse_request_send(fc, req); |
92a8780e MS |
1997 | err = req->out.h.error; |
1998 | fuse_put_request(fc, req); | |
1999 | if (err == -ENOSYS) { | |
2000 | fc->no_removexattr = 1; | |
2001 | err = -EOPNOTSUPP; | |
2002 | } | |
31f3267b | 2003 | if (!err) { |
d331a415 | 2004 | fuse_invalidate_attr(inode); |
31f3267b MP |
2005 | fuse_update_ctime(inode); |
2006 | } | |
92a8780e MS |
2007 | return err; |
2008 | } | |
2009 | ||
754661f1 | 2010 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 2011 | .lookup = fuse_lookup, |
9e6268db MS |
2012 | .mkdir = fuse_mkdir, |
2013 | .symlink = fuse_symlink, | |
2014 | .unlink = fuse_unlink, | |
2015 | .rmdir = fuse_rmdir, | |
1560c974 | 2016 | .rename2 = fuse_rename2, |
9e6268db MS |
2017 | .link = fuse_link, |
2018 | .setattr = fuse_setattr, | |
2019 | .create = fuse_create, | |
c8ccbe03 | 2020 | .atomic_open = fuse_atomic_open, |
9e6268db | 2021 | .mknod = fuse_mknod, |
e5e5558e MS |
2022 | .permission = fuse_permission, |
2023 | .getattr = fuse_getattr, | |
92a8780e MS |
2024 | .setxattr = fuse_setxattr, |
2025 | .getxattr = fuse_getxattr, | |
2026 | .listxattr = fuse_listxattr, | |
2027 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
2028 | }; |
2029 | ||
4b6f5d20 | 2030 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 2031 | .llseek = generic_file_llseek, |
e5e5558e | 2032 | .read = generic_read_dir, |
8d3af7f3 | 2033 | .iterate = fuse_readdir, |
e5e5558e MS |
2034 | .open = fuse_dir_open, |
2035 | .release = fuse_dir_release, | |
82547981 | 2036 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
2037 | .unlocked_ioctl = fuse_dir_ioctl, |
2038 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
2039 | }; |
2040 | ||
754661f1 | 2041 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 2042 | .setattr = fuse_setattr, |
e5e5558e MS |
2043 | .permission = fuse_permission, |
2044 | .getattr = fuse_getattr, | |
92a8780e MS |
2045 | .setxattr = fuse_setxattr, |
2046 | .getxattr = fuse_getxattr, | |
2047 | .listxattr = fuse_listxattr, | |
2048 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
2049 | }; |
2050 | ||
754661f1 | 2051 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 2052 | .setattr = fuse_setattr, |
e5e5558e MS |
2053 | .follow_link = fuse_follow_link, |
2054 | .put_link = fuse_put_link, | |
2055 | .readlink = generic_readlink, | |
2056 | .getattr = fuse_getattr, | |
92a8780e MS |
2057 | .setxattr = fuse_setxattr, |
2058 | .getxattr = fuse_getxattr, | |
2059 | .listxattr = fuse_listxattr, | |
2060 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
2061 | }; |
2062 | ||
2063 | void fuse_init_common(struct inode *inode) | |
2064 | { | |
2065 | inode->i_op = &fuse_common_inode_operations; | |
2066 | } | |
2067 | ||
2068 | void fuse_init_dir(struct inode *inode) | |
2069 | { | |
2070 | inode->i_op = &fuse_dir_inode_operations; | |
2071 | inode->i_fop = &fuse_dir_operations; | |
2072 | } | |
2073 | ||
2074 | void fuse_init_symlink(struct inode *inode) | |
2075 | { | |
2076 | inode->i_op = &fuse_symlink_inode_operations; | |
2077 | } |