]>
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 | ||
1560c974 MS |
755 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
756 | struct inode *newdir, struct dentry *newent, | |
757 | unsigned int flags, int opcode, size_t argsize) | |
9e6268db MS |
758 | { |
759 | int err; | |
1560c974 | 760 | struct fuse_rename2_in inarg; |
9e6268db | 761 | struct fuse_conn *fc = get_fuse_conn(olddir); |
1560c974 | 762 | struct fuse_req *req; |
e4eaac06 | 763 | |
1560c974 | 764 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
765 | if (IS_ERR(req)) |
766 | return PTR_ERR(req); | |
9e6268db | 767 | |
1560c974 | 768 | memset(&inarg, 0, argsize); |
9e6268db | 769 | inarg.newdir = get_node_id(newdir); |
1560c974 MS |
770 | inarg.flags = flags; |
771 | req->in.h.opcode = opcode; | |
9e6268db | 772 | req->in.h.nodeid = get_node_id(olddir); |
9e6268db | 773 | req->in.numargs = 3; |
1560c974 | 774 | req->in.args[0].size = argsize; |
9e6268db MS |
775 | req->in.args[0].value = &inarg; |
776 | req->in.args[1].size = oldent->d_name.len + 1; | |
777 | req->in.args[1].value = oldent->d_name.name; | |
778 | req->in.args[2].size = newent->d_name.len + 1; | |
779 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 780 | fuse_request_send(fc, req); |
9e6268db MS |
781 | err = req->out.h.error; |
782 | fuse_put_request(fc, req); | |
783 | if (!err) { | |
08b63307 MS |
784 | /* ctime changes */ |
785 | fuse_invalidate_attr(oldent->d_inode); | |
31f3267b | 786 | fuse_update_ctime(oldent->d_inode); |
08b63307 | 787 | |
1560c974 MS |
788 | if (flags & RENAME_EXCHANGE) { |
789 | fuse_invalidate_attr(newent->d_inode); | |
790 | fuse_update_ctime(newent->d_inode); | |
791 | } | |
792 | ||
9e6268db MS |
793 | fuse_invalidate_attr(olddir); |
794 | if (olddir != newdir) | |
795 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
796 | |
797 | /* newent will end up negative */ | |
1560c974 | 798 | if (!(flags & RENAME_EXCHANGE) && newent->d_inode) { |
5219f346 | 799 | fuse_invalidate_attr(newent->d_inode); |
8cbdf1e6 | 800 | fuse_invalidate_entry_cache(newent); |
31f3267b | 801 | fuse_update_ctime(newent->d_inode); |
5219f346 | 802 | } |
9e6268db MS |
803 | } else if (err == -EINTR) { |
804 | /* If request was interrupted, DEITY only knows if the | |
805 | rename actually took place. If the invalidation | |
806 | fails (e.g. some process has CWD under the renamed | |
807 | directory), then there can be inconsistency between | |
808 | the dcache and the real filesystem. Tough luck. */ | |
809 | fuse_invalidate_entry(oldent); | |
810 | if (newent->d_inode) | |
811 | fuse_invalidate_entry(newent); | |
812 | } | |
813 | ||
814 | return err; | |
815 | } | |
816 | ||
1560c974 MS |
817 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, |
818 | struct inode *newdir, struct dentry *newent) | |
819 | { | |
820 | return fuse_rename_common(olddir, oldent, newdir, newent, 0, | |
821 | FUSE_RENAME, sizeof(struct fuse_rename_in)); | |
822 | } | |
823 | ||
824 | static int fuse_rename2(struct inode *olddir, struct dentry *oldent, | |
825 | struct inode *newdir, struct dentry *newent, | |
826 | unsigned int flags) | |
827 | { | |
828 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
829 | int err; | |
830 | ||
831 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) | |
832 | return -EINVAL; | |
833 | ||
834 | if (fc->no_rename2 || fc->minor < 23) | |
835 | return -EINVAL; | |
836 | ||
837 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, | |
838 | FUSE_RENAME2, sizeof(struct fuse_rename2_in)); | |
839 | if (err == -ENOSYS) { | |
840 | fc->no_rename2 = 1; | |
841 | err = -EINVAL; | |
842 | } | |
843 | return err; | |
844 | ||
845 | } | |
846 | ||
9e6268db MS |
847 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
848 | struct dentry *newent) | |
849 | { | |
850 | int err; | |
851 | struct fuse_link_in inarg; | |
852 | struct inode *inode = entry->d_inode; | |
853 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 854 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
855 | if (IS_ERR(req)) |
856 | return PTR_ERR(req); | |
9e6268db MS |
857 | |
858 | memset(&inarg, 0, sizeof(inarg)); | |
859 | inarg.oldnodeid = get_node_id(inode); | |
860 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
861 | req->in.numargs = 2; |
862 | req->in.args[0].size = sizeof(inarg); | |
863 | req->in.args[0].value = &inarg; | |
864 | req->in.args[1].size = newent->d_name.len + 1; | |
865 | req->in.args[1].value = newent->d_name.name; | |
866 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
867 | /* Contrary to "normal" filesystems it can happen that link | |
868 | makes two "logical" inodes point to the same "physical" | |
869 | inode. We invalidate the attributes of the old one, so it | |
870 | will reflect changes in the backing inode (link count, | |
871 | etc.) | |
872 | */ | |
ac45d613 MS |
873 | if (!err) { |
874 | struct fuse_inode *fi = get_fuse_inode(inode); | |
875 | ||
876 | spin_lock(&fc->lock); | |
877 | fi->attr_version = ++fc->attr_version; | |
878 | inc_nlink(inode); | |
879 | spin_unlock(&fc->lock); | |
9e6268db | 880 | fuse_invalidate_attr(inode); |
31f3267b | 881 | fuse_update_ctime(inode); |
ac45d613 MS |
882 | } else if (err == -EINTR) { |
883 | fuse_invalidate_attr(inode); | |
884 | } | |
9e6268db MS |
885 | return err; |
886 | } | |
887 | ||
1fb69e78 MS |
888 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
889 | struct kstat *stat) | |
890 | { | |
203627bb | 891 | unsigned int blkbits; |
8373200b PE |
892 | struct fuse_conn *fc = get_fuse_conn(inode); |
893 | ||
894 | /* see the comment in fuse_change_attributes() */ | |
b0aa7606 | 895 | if (fc->writeback_cache && S_ISREG(inode->i_mode)) { |
8373200b | 896 | attr->size = i_size_read(inode); |
b0aa7606 MP |
897 | attr->mtime = inode->i_mtime.tv_sec; |
898 | attr->mtimensec = inode->i_mtime.tv_nsec; | |
31f3267b MP |
899 | attr->ctime = inode->i_ctime.tv_sec; |
900 | attr->ctimensec = inode->i_ctime.tv_nsec; | |
b0aa7606 | 901 | } |
203627bb | 902 | |
1fb69e78 MS |
903 | stat->dev = inode->i_sb->s_dev; |
904 | stat->ino = attr->ino; | |
905 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
906 | stat->nlink = attr->nlink; | |
499dcf20 EB |
907 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
908 | stat->gid = make_kgid(&init_user_ns, attr->gid); | |
1fb69e78 MS |
909 | stat->rdev = inode->i_rdev; |
910 | stat->atime.tv_sec = attr->atime; | |
911 | stat->atime.tv_nsec = attr->atimensec; | |
912 | stat->mtime.tv_sec = attr->mtime; | |
913 | stat->mtime.tv_nsec = attr->mtimensec; | |
914 | stat->ctime.tv_sec = attr->ctime; | |
915 | stat->ctime.tv_nsec = attr->ctimensec; | |
916 | stat->size = attr->size; | |
917 | stat->blocks = attr->blocks; | |
203627bb MS |
918 | |
919 | if (attr->blksize != 0) | |
920 | blkbits = ilog2(attr->blksize); | |
921 | else | |
922 | blkbits = inode->i_sb->s_blocksize_bits; | |
923 | ||
924 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
925 | } |
926 | ||
c79e322f MS |
927 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
928 | struct file *file) | |
e5e5558e MS |
929 | { |
930 | int err; | |
c79e322f MS |
931 | struct fuse_getattr_in inarg; |
932 | struct fuse_attr_out outarg; | |
e5e5558e | 933 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
934 | struct fuse_req *req; |
935 | u64 attr_version; | |
936 | ||
b111c8c0 | 937 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
938 | if (IS_ERR(req)) |
939 | return PTR_ERR(req); | |
e5e5558e | 940 | |
7dca9fd3 | 941 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 942 | |
c79e322f | 943 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 944 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
945 | /* Directories have separate file-handle space */ |
946 | if (file && S_ISREG(inode->i_mode)) { | |
947 | struct fuse_file *ff = file->private_data; | |
948 | ||
949 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
950 | inarg.fh = ff->fh; | |
951 | } | |
e5e5558e MS |
952 | req->in.h.opcode = FUSE_GETATTR; |
953 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
954 | req->in.numargs = 1; |
955 | req->in.args[0].size = sizeof(inarg); | |
956 | req->in.args[0].value = &inarg; | |
e5e5558e | 957 | req->out.numargs = 1; |
0e9663ee MS |
958 | if (fc->minor < 9) |
959 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
960 | else | |
961 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 962 | req->out.args[0].value = &outarg; |
b93f858a | 963 | fuse_request_send(fc, req); |
e5e5558e MS |
964 | err = req->out.h.error; |
965 | fuse_put_request(fc, req); | |
966 | if (!err) { | |
c79e322f | 967 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
968 | make_bad_inode(inode); |
969 | err = -EIO; | |
970 | } else { | |
c79e322f MS |
971 | fuse_change_attributes(inode, &outarg.attr, |
972 | attr_timeout(&outarg), | |
1fb69e78 MS |
973 | attr_version); |
974 | if (stat) | |
c79e322f | 975 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
976 | } |
977 | } | |
978 | return err; | |
979 | } | |
980 | ||
bcb4be80 MS |
981 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
982 | struct file *file, bool *refreshed) | |
983 | { | |
984 | struct fuse_inode *fi = get_fuse_inode(inode); | |
985 | int err; | |
986 | bool r; | |
987 | ||
988 | if (fi->i_time < get_jiffies_64()) { | |
989 | r = true; | |
990 | err = fuse_do_getattr(inode, stat, file); | |
991 | } else { | |
992 | r = false; | |
993 | err = 0; | |
994 | if (stat) { | |
995 | generic_fillattr(inode, stat); | |
996 | stat->mode = fi->orig_i_mode; | |
45c72cd7 | 997 | stat->ino = fi->orig_ino; |
bcb4be80 MS |
998 | } |
999 | } | |
1000 | ||
1001 | if (refreshed != NULL) | |
1002 | *refreshed = r; | |
1003 | ||
1004 | return err; | |
1005 | } | |
1006 | ||
3b463ae0 | 1007 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 1008 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
1009 | { |
1010 | int err = -ENOTDIR; | |
1011 | struct inode *parent; | |
1012 | struct dentry *dir; | |
1013 | struct dentry *entry; | |
1014 | ||
1015 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
1016 | if (!parent) | |
1017 | return -ENOENT; | |
1018 | ||
1019 | mutex_lock(&parent->i_mutex); | |
1020 | if (!S_ISDIR(parent->i_mode)) | |
1021 | goto unlock; | |
1022 | ||
1023 | err = -ENOENT; | |
1024 | dir = d_find_alias(parent); | |
1025 | if (!dir) | |
1026 | goto unlock; | |
1027 | ||
1028 | entry = d_lookup(dir, name); | |
1029 | dput(dir); | |
1030 | if (!entry) | |
1031 | goto unlock; | |
1032 | ||
1033 | fuse_invalidate_attr(parent); | |
1034 | fuse_invalidate_entry(entry); | |
451d0f59 JM |
1035 | |
1036 | if (child_nodeid != 0 && entry->d_inode) { | |
1037 | mutex_lock(&entry->d_inode->i_mutex); | |
1038 | if (get_node_id(entry->d_inode) != child_nodeid) { | |
1039 | err = -ENOENT; | |
1040 | goto badentry; | |
1041 | } | |
1042 | if (d_mountpoint(entry)) { | |
1043 | err = -EBUSY; | |
1044 | goto badentry; | |
1045 | } | |
1046 | if (S_ISDIR(entry->d_inode->i_mode)) { | |
1047 | shrink_dcache_parent(entry); | |
1048 | if (!simple_empty(entry)) { | |
1049 | err = -ENOTEMPTY; | |
1050 | goto badentry; | |
1051 | } | |
1052 | entry->d_inode->i_flags |= S_DEAD; | |
1053 | } | |
1054 | dont_mount(entry); | |
1055 | clear_nlink(entry->d_inode); | |
1056 | err = 0; | |
1057 | badentry: | |
1058 | mutex_unlock(&entry->d_inode->i_mutex); | |
1059 | if (!err) | |
1060 | d_delete(entry); | |
1061 | } else { | |
1062 | err = 0; | |
1063 | } | |
3b463ae0 | 1064 | dput(entry); |
3b463ae0 JM |
1065 | |
1066 | unlock: | |
1067 | mutex_unlock(&parent->i_mutex); | |
1068 | iput(parent); | |
1069 | return err; | |
1070 | } | |
1071 | ||
87729a55 MS |
1072 | /* |
1073 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1074 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1075 | * means, that the filesystem daemon is able to record the exact |
1076 | * filesystem operations performed, and can also control the behavior | |
1077 | * of the requester process in otherwise impossible ways. For example | |
1078 | * it can delay the operation for arbitrary length of time allowing | |
1079 | * DoS against the requester. | |
1080 | * | |
1081 | * For this reason only those processes can call into the filesystem, | |
1082 | * for which the owner of the mount has ptrace privilege. This | |
1083 | * excludes processes started by other users, suid or sgid processes. | |
1084 | */ | |
c2132c1b | 1085 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1086 | { |
c69e8d9c | 1087 | const struct cred *cred; |
87729a55 | 1088 | |
c69e8d9c | 1089 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
1090 | return 1; |
1091 | ||
c2132c1b | 1092 | cred = current_cred(); |
499dcf20 EB |
1093 | if (uid_eq(cred->euid, fc->user_id) && |
1094 | uid_eq(cred->suid, fc->user_id) && | |
1095 | uid_eq(cred->uid, fc->user_id) && | |
1096 | gid_eq(cred->egid, fc->group_id) && | |
1097 | gid_eq(cred->sgid, fc->group_id) && | |
1098 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1099 | return 1; |
c69e8d9c | 1100 | |
c2132c1b | 1101 | return 0; |
87729a55 MS |
1102 | } |
1103 | ||
31d40d74 MS |
1104 | static int fuse_access(struct inode *inode, int mask) |
1105 | { | |
1106 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1107 | struct fuse_req *req; | |
1108 | struct fuse_access_in inarg; | |
1109 | int err; | |
1110 | ||
698fa1d1 MS |
1111 | BUG_ON(mask & MAY_NOT_BLOCK); |
1112 | ||
31d40d74 MS |
1113 | if (fc->no_access) |
1114 | return 0; | |
1115 | ||
b111c8c0 | 1116 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1117 | if (IS_ERR(req)) |
1118 | return PTR_ERR(req); | |
31d40d74 MS |
1119 | |
1120 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 1121 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
1122 | req->in.h.opcode = FUSE_ACCESS; |
1123 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
1124 | req->in.numargs = 1; |
1125 | req->in.args[0].size = sizeof(inarg); | |
1126 | req->in.args[0].value = &inarg; | |
b93f858a | 1127 | fuse_request_send(fc, req); |
31d40d74 MS |
1128 | err = req->out.h.error; |
1129 | fuse_put_request(fc, req); | |
1130 | if (err == -ENOSYS) { | |
1131 | fc->no_access = 1; | |
1132 | err = 0; | |
1133 | } | |
1134 | return err; | |
1135 | } | |
1136 | ||
10556cb2 | 1137 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1138 | { |
10556cb2 | 1139 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1140 | return -ECHILD; |
1141 | ||
1142 | return fuse_do_getattr(inode, NULL, NULL); | |
1143 | } | |
1144 | ||
6f9f1180 MS |
1145 | /* |
1146 | * Check permission. The two basic access models of FUSE are: | |
1147 | * | |
1148 | * 1) Local access checking ('default_permissions' mount option) based | |
1149 | * on file mode. This is the plain old disk filesystem permission | |
1150 | * modell. | |
1151 | * | |
1152 | * 2) "Remote" access checking, where server is responsible for | |
1153 | * checking permission in each inode operation. An exception to this | |
1154 | * is if ->permission() was invoked from sys_access() in which case an | |
1155 | * access request is sent. Execute permission is still checked | |
1156 | * locally based on file mode. | |
1157 | */ | |
10556cb2 | 1158 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1159 | { |
1160 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1161 | bool refreshed = false; |
1162 | int err = 0; | |
e5e5558e | 1163 | |
c2132c1b | 1164 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1165 | return -EACCES; |
244f6385 MS |
1166 | |
1167 | /* | |
e8e96157 | 1168 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1169 | */ |
e8e96157 MS |
1170 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1171 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
19690ddb MS |
1172 | struct fuse_inode *fi = get_fuse_inode(inode); |
1173 | ||
1174 | if (fi->i_time < get_jiffies_64()) { | |
1175 | refreshed = true; | |
1176 | ||
10556cb2 | 1177 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1178 | if (err) |
1179 | return err; | |
1180 | } | |
244f6385 MS |
1181 | } |
1182 | ||
1183 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
2830ba7f | 1184 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1185 | |
1186 | /* If permission is denied, try to refresh file | |
1187 | attributes. This is also needed, because the root | |
1188 | node will at first have no permissions */ | |
244f6385 | 1189 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1190 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1191 | if (!err) |
2830ba7f | 1192 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1193 | } |
1194 | ||
6f9f1180 MS |
1195 | /* Note: the opposite of the above test does not |
1196 | exist. So if permissions are revoked this won't be | |
1197 | noticed immediately, only after the attribute | |
1198 | timeout has expired */ | |
9cfcac81 | 1199 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1200 | err = fuse_access(inode, mask); |
1201 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1202 | if (!(inode->i_mode & S_IXUGO)) { | |
1203 | if (refreshed) | |
1204 | return -EACCES; | |
1205 | ||
10556cb2 | 1206 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1207 | if (!err && !(inode->i_mode & S_IXUGO)) |
1208 | return -EACCES; | |
1209 | } | |
e5e5558e | 1210 | } |
244f6385 | 1211 | return err; |
e5e5558e MS |
1212 | } |
1213 | ||
1214 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1215 | struct dir_context *ctx) |
e5e5558e MS |
1216 | { |
1217 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1218 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1219 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
e5e5558e MS |
1220 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
1221 | return -EIO; | |
1222 | if (reclen > nbytes) | |
1223 | break; | |
efeb9e60 MS |
1224 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1225 | return -EIO; | |
e5e5558e | 1226 | |
8d3af7f3 AV |
1227 | if (!dir_emit(ctx, dirent->name, dirent->namelen, |
1228 | dirent->ino, dirent->type)) | |
e5e5558e MS |
1229 | break; |
1230 | ||
1231 | buf += reclen; | |
1232 | nbytes -= reclen; | |
8d3af7f3 | 1233 | ctx->pos = dirent->off; |
e5e5558e MS |
1234 | } |
1235 | ||
1236 | return 0; | |
1237 | } | |
1238 | ||
0b05b183 AA |
1239 | static int fuse_direntplus_link(struct file *file, |
1240 | struct fuse_direntplus *direntplus, | |
1241 | u64 attr_version) | |
1242 | { | |
1243 | int err; | |
1244 | struct fuse_entry_out *o = &direntplus->entry_out; | |
1245 | struct fuse_dirent *dirent = &direntplus->dirent; | |
1246 | struct dentry *parent = file->f_path.dentry; | |
1247 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); | |
1248 | struct dentry *dentry; | |
1249 | struct dentry *alias; | |
1250 | struct inode *dir = parent->d_inode; | |
1251 | struct fuse_conn *fc; | |
1252 | struct inode *inode; | |
1253 | ||
1254 | if (!o->nodeid) { | |
1255 | /* | |
1256 | * Unlike in the case of fuse_lookup, zero nodeid does not mean | |
1257 | * ENOENT. Instead, it only means the userspace filesystem did | |
1258 | * not want to return attributes/handle for this entry. | |
1259 | * | |
1260 | * So do nothing. | |
1261 | */ | |
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | if (name.name[0] == '.') { | |
1266 | /* | |
1267 | * We could potentially refresh the attributes of the directory | |
1268 | * and its parent? | |
1269 | */ | |
1270 | if (name.len == 1) | |
1271 | return 0; | |
1272 | if (name.name[1] == '.' && name.len == 2) | |
1273 | return 0; | |
1274 | } | |
a28ef45c MS |
1275 | |
1276 | if (invalid_nodeid(o->nodeid)) | |
1277 | return -EIO; | |
1278 | if (!fuse_valid_type(o->attr.mode)) | |
1279 | return -EIO; | |
1280 | ||
0b05b183 AA |
1281 | fc = get_fuse_conn(dir); |
1282 | ||
1283 | name.hash = full_name_hash(name.name, name.len); | |
1284 | dentry = d_lookup(parent, &name); | |
53ce9a33 | 1285 | if (dentry) { |
0b05b183 | 1286 | inode = dentry->d_inode; |
53ce9a33 NV |
1287 | if (!inode) { |
1288 | d_drop(dentry); | |
a28ef45c MS |
1289 | } else if (get_node_id(inode) != o->nodeid || |
1290 | ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { | |
53ce9a33 NV |
1291 | err = d_invalidate(dentry); |
1292 | if (err) | |
1293 | goto out; | |
a28ef45c MS |
1294 | } else if (is_bad_inode(inode)) { |
1295 | err = -EIO; | |
1296 | goto out; | |
53ce9a33 | 1297 | } else { |
0b05b183 AA |
1298 | struct fuse_inode *fi; |
1299 | fi = get_fuse_inode(inode); | |
1300 | spin_lock(&fc->lock); | |
1301 | fi->nlookup++; | |
1302 | spin_unlock(&fc->lock); | |
1303 | ||
fa2b7213 MS |
1304 | fuse_change_attributes(inode, &o->attr, |
1305 | entry_attr_timeout(o), | |
1306 | attr_version); | |
1307 | ||
0b05b183 AA |
1308 | /* |
1309 | * The other branch to 'found' comes via fuse_iget() | |
1310 | * which bumps nlookup inside | |
1311 | */ | |
1312 | goto found; | |
1313 | } | |
0b05b183 | 1314 | dput(dentry); |
0b05b183 AA |
1315 | } |
1316 | ||
1317 | dentry = d_alloc(parent, &name); | |
1318 | err = -ENOMEM; | |
1319 | if (!dentry) | |
1320 | goto out; | |
1321 | ||
1322 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, | |
1323 | &o->attr, entry_attr_timeout(o), attr_version); | |
1324 | if (!inode) | |
1325 | goto out; | |
1326 | ||
b70a80e7 | 1327 | alias = d_materialise_unique(dentry, inode); |
5835f339 MS |
1328 | err = PTR_ERR(alias); |
1329 | if (IS_ERR(alias)) | |
1330 | goto out; | |
2914941e | 1331 | |
0b05b183 AA |
1332 | if (alias) { |
1333 | dput(dentry); | |
1334 | dentry = alias; | |
1335 | } | |
1336 | ||
1337 | found: | |
6314efee MS |
1338 | if (fc->readdirplus_auto) |
1339 | set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state); | |
0b05b183 AA |
1340 | fuse_change_entry_timeout(dentry, o); |
1341 | ||
1342 | err = 0; | |
1343 | out: | |
c7263bcd | 1344 | dput(dentry); |
0b05b183 AA |
1345 | return err; |
1346 | } | |
1347 | ||
1348 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1349 | struct dir_context *ctx, u64 attr_version) |
0b05b183 AA |
1350 | { |
1351 | struct fuse_direntplus *direntplus; | |
1352 | struct fuse_dirent *dirent; | |
1353 | size_t reclen; | |
1354 | int over = 0; | |
1355 | int ret; | |
1356 | ||
1357 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { | |
1358 | direntplus = (struct fuse_direntplus *) buf; | |
1359 | dirent = &direntplus->dirent; | |
1360 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); | |
1361 | ||
1362 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1363 | return -EIO; | |
1364 | if (reclen > nbytes) | |
1365 | break; | |
efeb9e60 MS |
1366 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1367 | return -EIO; | |
0b05b183 AA |
1368 | |
1369 | if (!over) { | |
1370 | /* We fill entries into dstbuf only as much as | |
1371 | it can hold. But we still continue iterating | |
1372 | over remaining entries to link them. If not, | |
1373 | we need to send a FORGET for each of those | |
1374 | which we did not link. | |
1375 | */ | |
8d3af7f3 AV |
1376 | over = !dir_emit(ctx, dirent->name, dirent->namelen, |
1377 | dirent->ino, dirent->type); | |
1378 | ctx->pos = dirent->off; | |
0b05b183 AA |
1379 | } |
1380 | ||
1381 | buf += reclen; | |
1382 | nbytes -= reclen; | |
1383 | ||
1384 | ret = fuse_direntplus_link(file, direntplus, attr_version); | |
1385 | if (ret) | |
1386 | fuse_force_forget(file, direntplus->entry_out.nodeid); | |
1387 | } | |
1388 | ||
1389 | return 0; | |
1390 | } | |
1391 | ||
8d3af7f3 | 1392 | static int fuse_readdir(struct file *file, struct dir_context *ctx) |
e5e5558e | 1393 | { |
4582a4ab | 1394 | int plus, err; |
04730fef MS |
1395 | size_t nbytes; |
1396 | struct page *page; | |
496ad9aa | 1397 | struct inode *inode = file_inode(file); |
e5e5558e | 1398 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 | 1399 | struct fuse_req *req; |
0b05b183 | 1400 | u64 attr_version = 0; |
248d86e8 MS |
1401 | |
1402 | if (is_bad_inode(inode)) | |
1403 | return -EIO; | |
1404 | ||
b111c8c0 | 1405 | req = fuse_get_req(fc, 1); |
ce1d5a49 MS |
1406 | if (IS_ERR(req)) |
1407 | return PTR_ERR(req); | |
e5e5558e | 1408 | |
04730fef MS |
1409 | page = alloc_page(GFP_KERNEL); |
1410 | if (!page) { | |
1411 | fuse_put_request(fc, req); | |
1412 | return -ENOMEM; | |
1413 | } | |
4582a4ab | 1414 | |
8d3af7f3 | 1415 | plus = fuse_use_readdirplus(inode, ctx); |
f4975c67 | 1416 | req->out.argpages = 1; |
04730fef MS |
1417 | req->num_pages = 1; |
1418 | req->pages[0] = page; | |
85f40aec | 1419 | req->page_descs[0].length = PAGE_SIZE; |
4582a4ab | 1420 | if (plus) { |
0b05b183 | 1421 | attr_version = fuse_get_attr_version(fc); |
8d3af7f3 | 1422 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1423 | FUSE_READDIRPLUS); |
1424 | } else { | |
8d3af7f3 | 1425 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1426 | FUSE_READDIR); |
1427 | } | |
b93f858a | 1428 | fuse_request_send(fc, req); |
361b1eb5 | 1429 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1430 | err = req->out.h.error; |
1431 | fuse_put_request(fc, req); | |
0b05b183 | 1432 | if (!err) { |
4582a4ab | 1433 | if (plus) { |
0b05b183 | 1434 | err = parse_dirplusfile(page_address(page), nbytes, |
8d3af7f3 | 1435 | file, ctx, |
0b05b183 AA |
1436 | attr_version); |
1437 | } else { | |
1438 | err = parse_dirfile(page_address(page), nbytes, file, | |
8d3af7f3 | 1439 | ctx); |
0b05b183 AA |
1440 | } |
1441 | } | |
e5e5558e | 1442 | |
04730fef | 1443 | __free_page(page); |
451418fc | 1444 | fuse_invalidate_atime(inode); |
04730fef | 1445 | return err; |
e5e5558e MS |
1446 | } |
1447 | ||
1448 | static char *read_link(struct dentry *dentry) | |
1449 | { | |
1450 | struct inode *inode = dentry->d_inode; | |
1451 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 1452 | struct fuse_req *req = fuse_get_req_nopages(fc); |
e5e5558e MS |
1453 | char *link; |
1454 | ||
ce1d5a49 | 1455 | if (IS_ERR(req)) |
e231c2ee | 1456 | return ERR_CAST(req); |
e5e5558e MS |
1457 | |
1458 | link = (char *) __get_free_page(GFP_KERNEL); | |
1459 | if (!link) { | |
1460 | link = ERR_PTR(-ENOMEM); | |
1461 | goto out; | |
1462 | } | |
1463 | req->in.h.opcode = FUSE_READLINK; | |
1464 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1465 | req->out.argvar = 1; |
1466 | req->out.numargs = 1; | |
1467 | req->out.args[0].size = PAGE_SIZE - 1; | |
1468 | req->out.args[0].value = link; | |
b93f858a | 1469 | fuse_request_send(fc, req); |
e5e5558e MS |
1470 | if (req->out.h.error) { |
1471 | free_page((unsigned long) link); | |
1472 | link = ERR_PTR(req->out.h.error); | |
1473 | } else | |
1474 | link[req->out.args[0].size] = '\0'; | |
1475 | out: | |
1476 | fuse_put_request(fc, req); | |
451418fc | 1477 | fuse_invalidate_atime(inode); |
e5e5558e MS |
1478 | return link; |
1479 | } | |
1480 | ||
1481 | static void free_link(char *link) | |
1482 | { | |
1483 | if (!IS_ERR(link)) | |
1484 | free_page((unsigned long) link); | |
1485 | } | |
1486 | ||
1487 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1488 | { | |
1489 | nd_set_link(nd, read_link(dentry)); | |
1490 | return NULL; | |
1491 | } | |
1492 | ||
1493 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1494 | { | |
1495 | free_link(nd_get_link(nd)); | |
1496 | } | |
1497 | ||
1498 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1499 | { | |
91fe96b4 | 1500 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1501 | } |
1502 | ||
1503 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1504 | { | |
8b0797a4 MS |
1505 | fuse_release_common(file, FUSE_RELEASEDIR); |
1506 | ||
1507 | return 0; | |
e5e5558e MS |
1508 | } |
1509 | ||
02c24a82 JB |
1510 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1511 | int datasync) | |
82547981 | 1512 | { |
02c24a82 | 1513 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1514 | } |
1515 | ||
b18da0c5 MS |
1516 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1517 | unsigned long arg) | |
1518 | { | |
1519 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1520 | ||
1521 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1522 | if (fc->minor < 18) | |
1523 | return -ENOTTY; | |
1524 | ||
1525 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1526 | } | |
1527 | ||
1528 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1529 | unsigned long arg) | |
1530 | { | |
1531 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1532 | ||
1533 | if (fc->minor < 18) | |
1534 | return -ENOTTY; | |
1535 | ||
1536 | return fuse_ioctl_common(file, cmd, arg, | |
1537 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1538 | } | |
1539 | ||
b0aa7606 | 1540 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
17637cba MS |
1541 | { |
1542 | /* Always update if mtime is explicitly set */ | |
1543 | if (ivalid & ATTR_MTIME_SET) | |
1544 | return true; | |
1545 | ||
b0aa7606 MP |
1546 | /* Or if kernel i_mtime is the official one */ |
1547 | if (trust_local_mtime) | |
1548 | return true; | |
1549 | ||
17637cba MS |
1550 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
1551 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1552 | return false; | |
1553 | ||
1554 | /* In all other cases update */ | |
1555 | return true; | |
1556 | } | |
1557 | ||
b0aa7606 | 1558 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg, |
3ad22c62 | 1559 | bool trust_local_cmtime) |
9e6268db MS |
1560 | { |
1561 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1562 | |
1563 | if (ivalid & ATTR_MODE) | |
befc649c | 1564 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1565 | if (ivalid & ATTR_UID) |
499dcf20 | 1566 | arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid); |
9e6268db | 1567 | if (ivalid & ATTR_GID) |
499dcf20 | 1568 | arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid); |
9e6268db | 1569 | if (ivalid & ATTR_SIZE) |
befc649c | 1570 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1571 | if (ivalid & ATTR_ATIME) { |
1572 | arg->valid |= FATTR_ATIME; | |
befc649c | 1573 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1574 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1575 | if (!(ivalid & ATTR_ATIME_SET)) | |
1576 | arg->valid |= FATTR_ATIME_NOW; | |
1577 | } | |
3ad22c62 | 1578 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
17637cba | 1579 | arg->valid |= FATTR_MTIME; |
befc649c | 1580 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba | 1581 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
3ad22c62 | 1582 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
17637cba | 1583 | arg->valid |= FATTR_MTIME_NOW; |
befc649c | 1584 | } |
3ad22c62 MP |
1585 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
1586 | arg->valid |= FATTR_CTIME; | |
1587 | arg->ctime = iattr->ia_ctime.tv_sec; | |
1588 | arg->ctimensec = iattr->ia_ctime.tv_nsec; | |
1589 | } | |
9e6268db MS |
1590 | } |
1591 | ||
3be5a52b MS |
1592 | /* |
1593 | * Prevent concurrent writepages on inode | |
1594 | * | |
1595 | * This is done by adding a negative bias to the inode write counter | |
1596 | * and waiting for all pending writes to finish. | |
1597 | */ | |
1598 | void fuse_set_nowrite(struct inode *inode) | |
1599 | { | |
1600 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1601 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1602 | ||
1603 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1604 | ||
1605 | spin_lock(&fc->lock); | |
1606 | BUG_ON(fi->writectr < 0); | |
1607 | fi->writectr += FUSE_NOWRITE; | |
1608 | spin_unlock(&fc->lock); | |
1609 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1610 | } | |
1611 | ||
1612 | /* | |
1613 | * Allow writepages on inode | |
1614 | * | |
1615 | * Remove the bias from the writecounter and send any queued | |
1616 | * writepages. | |
1617 | */ | |
1618 | static void __fuse_release_nowrite(struct inode *inode) | |
1619 | { | |
1620 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1621 | ||
1622 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1623 | fi->writectr = 0; | |
1624 | fuse_flush_writepages(inode); | |
1625 | } | |
1626 | ||
1627 | void fuse_release_nowrite(struct inode *inode) | |
1628 | { | |
1629 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1630 | ||
1631 | spin_lock(&fc->lock); | |
1632 | __fuse_release_nowrite(inode); | |
1633 | spin_unlock(&fc->lock); | |
1634 | } | |
1635 | ||
b0aa7606 MP |
1636 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_req *req, |
1637 | struct inode *inode, | |
1638 | struct fuse_setattr_in *inarg_p, | |
1639 | struct fuse_attr_out *outarg_p) | |
1640 | { | |
1641 | req->in.h.opcode = FUSE_SETATTR; | |
1642 | req->in.h.nodeid = get_node_id(inode); | |
1643 | req->in.numargs = 1; | |
1644 | req->in.args[0].size = sizeof(*inarg_p); | |
1645 | req->in.args[0].value = inarg_p; | |
1646 | req->out.numargs = 1; | |
1647 | if (fc->minor < 9) | |
1648 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1649 | else | |
1650 | req->out.args[0].size = sizeof(*outarg_p); | |
1651 | req->out.args[0].value = outarg_p; | |
1652 | } | |
1653 | ||
1654 | /* | |
1655 | * Flush inode->i_mtime to the server | |
1656 | */ | |
ab9e13f7 | 1657 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
b0aa7606 | 1658 | { |
b0aa7606 | 1659 | struct fuse_conn *fc = get_fuse_conn(inode); |
1e18bda8 | 1660 | struct fuse_req *req; |
b0aa7606 MP |
1661 | struct fuse_setattr_in inarg; |
1662 | struct fuse_attr_out outarg; | |
1663 | int err; | |
1664 | ||
1e18bda8 MS |
1665 | req = fuse_get_req_nopages(fc); |
1666 | if (IS_ERR(req)) | |
1667 | return PTR_ERR(req); | |
b0aa7606 MP |
1668 | |
1669 | memset(&inarg, 0, sizeof(inarg)); | |
1670 | memset(&outarg, 0, sizeof(outarg)); | |
1671 | ||
ab9e13f7 | 1672 | inarg.valid = FATTR_MTIME; |
b0aa7606 MP |
1673 | inarg.mtime = inode->i_mtime.tv_sec; |
1674 | inarg.mtimensec = inode->i_mtime.tv_nsec; | |
ab9e13f7 MP |
1675 | if (fc->minor >= 23) { |
1676 | inarg.valid |= FATTR_CTIME; | |
1677 | inarg.ctime = inode->i_ctime.tv_sec; | |
1678 | inarg.ctimensec = inode->i_ctime.tv_nsec; | |
1679 | } | |
1e18bda8 MS |
1680 | if (ff) { |
1681 | inarg.valid |= FATTR_FH; | |
1682 | inarg.fh = ff->fh; | |
1683 | } | |
b0aa7606 MP |
1684 | fuse_setattr_fill(fc, req, inode, &inarg, &outarg); |
1685 | fuse_request_send(fc, req); | |
1686 | err = req->out.h.error; | |
1687 | fuse_put_request(fc, req); | |
1688 | ||
b0aa7606 MP |
1689 | return err; |
1690 | } | |
1691 | ||
6f9f1180 MS |
1692 | /* |
1693 | * Set attributes, and at the same time refresh them. | |
1694 | * | |
1695 | * Truncation is slightly complicated, because the 'truncate' request | |
1696 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1697 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1698 | * and the actual truncation by hand. | |
6f9f1180 | 1699 | */ |
efb9fa9e MP |
1700 | int fuse_do_setattr(struct inode *inode, struct iattr *attr, |
1701 | struct file *file) | |
9e6268db | 1702 | { |
9e6268db | 1703 | struct fuse_conn *fc = get_fuse_conn(inode); |
06a7c3c2 | 1704 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db MS |
1705 | struct fuse_req *req; |
1706 | struct fuse_setattr_in inarg; | |
1707 | struct fuse_attr_out outarg; | |
3be5a52b | 1708 | bool is_truncate = false; |
8373200b | 1709 | bool is_wb = fc->writeback_cache; |
3be5a52b | 1710 | loff_t oldsize; |
9e6268db | 1711 | int err; |
3ad22c62 | 1712 | bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode); |
9e6268db | 1713 | |
db78b877 CH |
1714 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1715 | attr->ia_valid |= ATTR_FORCE; | |
1716 | ||
1717 | err = inode_change_ok(inode, attr); | |
1718 | if (err) | |
1719 | return err; | |
1e9a4ed9 | 1720 | |
8d56addd MS |
1721 | if (attr->ia_valid & ATTR_OPEN) { |
1722 | if (fc->atomic_o_trunc) | |
1723 | return 0; | |
1724 | file = NULL; | |
1725 | } | |
6ff958ed | 1726 | |
2c27c65e | 1727 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1728 | is_truncate = true; |
9e6268db | 1729 | |
b111c8c0 | 1730 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1731 | if (IS_ERR(req)) |
1732 | return PTR_ERR(req); | |
9e6268db | 1733 | |
06a7c3c2 | 1734 | if (is_truncate) { |
3be5a52b | 1735 | fuse_set_nowrite(inode); |
06a7c3c2 | 1736 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3ad22c62 MP |
1737 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
1738 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; | |
06a7c3c2 | 1739 | } |
3be5a52b | 1740 | |
9e6268db | 1741 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1742 | memset(&outarg, 0, sizeof(outarg)); |
3ad22c62 | 1743 | iattr_to_fattr(attr, &inarg, trust_local_cmtime); |
49d4914f MS |
1744 | if (file) { |
1745 | struct fuse_file *ff = file->private_data; | |
1746 | inarg.valid |= FATTR_FH; | |
1747 | inarg.fh = ff->fh; | |
1748 | } | |
f3332114 MS |
1749 | if (attr->ia_valid & ATTR_SIZE) { |
1750 | /* For mandatory locking in truncate */ | |
1751 | inarg.valid |= FATTR_LOCKOWNER; | |
1752 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1753 | } | |
b0aa7606 | 1754 | fuse_setattr_fill(fc, req, inode, &inarg, &outarg); |
b93f858a | 1755 | fuse_request_send(fc, req); |
9e6268db MS |
1756 | err = req->out.h.error; |
1757 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1758 | if (err) { |
1759 | if (err == -EINTR) | |
1760 | fuse_invalidate_attr(inode); | |
3be5a52b | 1761 | goto error; |
e00d2c2d | 1762 | } |
9e6268db | 1763 | |
e00d2c2d MS |
1764 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1765 | make_bad_inode(inode); | |
3be5a52b MS |
1766 | err = -EIO; |
1767 | goto error; | |
1768 | } | |
1769 | ||
1770 | spin_lock(&fc->lock); | |
b0aa7606 | 1771 | /* the kernel maintains i_mtime locally */ |
3ad22c62 MP |
1772 | if (trust_local_cmtime) { |
1773 | if (attr->ia_valid & ATTR_MTIME) | |
1774 | inode->i_mtime = attr->ia_mtime; | |
1775 | if (attr->ia_valid & ATTR_CTIME) | |
1776 | inode->i_ctime = attr->ia_ctime; | |
1e18bda8 | 1777 | /* FIXME: clear I_DIRTY_SYNC? */ |
b0aa7606 MP |
1778 | } |
1779 | ||
3be5a52b MS |
1780 | fuse_change_attributes_common(inode, &outarg.attr, |
1781 | attr_timeout(&outarg)); | |
1782 | oldsize = inode->i_size; | |
8373200b PE |
1783 | /* see the comment in fuse_change_attributes() */ |
1784 | if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) | |
1785 | i_size_write(inode, outarg.attr.size); | |
3be5a52b MS |
1786 | |
1787 | if (is_truncate) { | |
1788 | /* NOTE: this may release/reacquire fc->lock */ | |
1789 | __fuse_release_nowrite(inode); | |
1790 | } | |
1791 | spin_unlock(&fc->lock); | |
1792 | ||
1793 | /* | |
1794 | * Only call invalidate_inode_pages2() after removing | |
1795 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1796 | */ | |
8373200b PE |
1797 | if ((is_truncate || !is_wb) && |
1798 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1799 | truncate_pagecache(inode, outarg.attr.size); |
3be5a52b | 1800 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1801 | } |
1802 | ||
06a7c3c2 | 1803 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
e00d2c2d | 1804 | return 0; |
3be5a52b MS |
1805 | |
1806 | error: | |
1807 | if (is_truncate) | |
1808 | fuse_release_nowrite(inode); | |
1809 | ||
06a7c3c2 | 1810 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3be5a52b | 1811 | return err; |
9e6268db MS |
1812 | } |
1813 | ||
49d4914f MS |
1814 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1815 | { | |
efb9fa9e MP |
1816 | struct inode *inode = entry->d_inode; |
1817 | ||
1818 | if (!fuse_allow_current_process(get_fuse_conn(inode))) | |
1819 | return -EACCES; | |
1820 | ||
49d4914f | 1821 | if (attr->ia_valid & ATTR_FILE) |
efb9fa9e | 1822 | return fuse_do_setattr(inode, attr, attr->ia_file); |
49d4914f | 1823 | else |
efb9fa9e | 1824 | return fuse_do_setattr(inode, attr, NULL); |
49d4914f MS |
1825 | } |
1826 | ||
e5e5558e MS |
1827 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1828 | struct kstat *stat) | |
1829 | { | |
1830 | struct inode *inode = entry->d_inode; | |
244f6385 | 1831 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1832 | |
c2132c1b | 1833 | if (!fuse_allow_current_process(fc)) |
244f6385 MS |
1834 | return -EACCES; |
1835 | ||
bcb4be80 | 1836 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1837 | } |
1838 | ||
92a8780e MS |
1839 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1840 | const void *value, size_t size, int flags) | |
1841 | { | |
1842 | struct inode *inode = entry->d_inode; | |
1843 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1844 | struct fuse_req *req; | |
1845 | struct fuse_setxattr_in inarg; | |
1846 | int err; | |
1847 | ||
92a8780e MS |
1848 | if (fc->no_setxattr) |
1849 | return -EOPNOTSUPP; | |
1850 | ||
b111c8c0 | 1851 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1852 | if (IS_ERR(req)) |
1853 | return PTR_ERR(req); | |
92a8780e MS |
1854 | |
1855 | memset(&inarg, 0, sizeof(inarg)); | |
1856 | inarg.size = size; | |
1857 | inarg.flags = flags; | |
1858 | req->in.h.opcode = FUSE_SETXATTR; | |
1859 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1860 | req->in.numargs = 3; |
1861 | req->in.args[0].size = sizeof(inarg); | |
1862 | req->in.args[0].value = &inarg; | |
1863 | req->in.args[1].size = strlen(name) + 1; | |
1864 | req->in.args[1].value = name; | |
1865 | req->in.args[2].size = size; | |
1866 | req->in.args[2].value = value; | |
b93f858a | 1867 | fuse_request_send(fc, req); |
92a8780e MS |
1868 | err = req->out.h.error; |
1869 | fuse_put_request(fc, req); | |
1870 | if (err == -ENOSYS) { | |
1871 | fc->no_setxattr = 1; | |
1872 | err = -EOPNOTSUPP; | |
1873 | } | |
31f3267b | 1874 | if (!err) { |
d331a415 | 1875 | fuse_invalidate_attr(inode); |
31f3267b MP |
1876 | fuse_update_ctime(inode); |
1877 | } | |
92a8780e MS |
1878 | return err; |
1879 | } | |
1880 | ||
1881 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1882 | void *value, size_t size) | |
1883 | { | |
1884 | struct inode *inode = entry->d_inode; | |
1885 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1886 | struct fuse_req *req; | |
1887 | struct fuse_getxattr_in inarg; | |
1888 | struct fuse_getxattr_out outarg; | |
1889 | ssize_t ret; | |
1890 | ||
1891 | if (fc->no_getxattr) | |
1892 | return -EOPNOTSUPP; | |
1893 | ||
b111c8c0 | 1894 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1895 | if (IS_ERR(req)) |
1896 | return PTR_ERR(req); | |
92a8780e MS |
1897 | |
1898 | memset(&inarg, 0, sizeof(inarg)); | |
1899 | inarg.size = size; | |
1900 | req->in.h.opcode = FUSE_GETXATTR; | |
1901 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1902 | req->in.numargs = 2; |
1903 | req->in.args[0].size = sizeof(inarg); | |
1904 | req->in.args[0].value = &inarg; | |
1905 | req->in.args[1].size = strlen(name) + 1; | |
1906 | req->in.args[1].value = name; | |
1907 | /* This is really two different operations rolled into one */ | |
1908 | req->out.numargs = 1; | |
1909 | if (size) { | |
1910 | req->out.argvar = 1; | |
1911 | req->out.args[0].size = size; | |
1912 | req->out.args[0].value = value; | |
1913 | } else { | |
1914 | req->out.args[0].size = sizeof(outarg); | |
1915 | req->out.args[0].value = &outarg; | |
1916 | } | |
b93f858a | 1917 | fuse_request_send(fc, req); |
92a8780e MS |
1918 | ret = req->out.h.error; |
1919 | if (!ret) | |
1920 | ret = size ? req->out.args[0].size : outarg.size; | |
1921 | else { | |
1922 | if (ret == -ENOSYS) { | |
1923 | fc->no_getxattr = 1; | |
1924 | ret = -EOPNOTSUPP; | |
1925 | } | |
1926 | } | |
1927 | fuse_put_request(fc, req); | |
1928 | return ret; | |
1929 | } | |
1930 | ||
1931 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1932 | { | |
1933 | struct inode *inode = entry->d_inode; | |
1934 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1935 | struct fuse_req *req; | |
1936 | struct fuse_getxattr_in inarg; | |
1937 | struct fuse_getxattr_out outarg; | |
1938 | ssize_t ret; | |
1939 | ||
c2132c1b | 1940 | if (!fuse_allow_current_process(fc)) |
e57ac683 MS |
1941 | return -EACCES; |
1942 | ||
92a8780e MS |
1943 | if (fc->no_listxattr) |
1944 | return -EOPNOTSUPP; | |
1945 | ||
b111c8c0 | 1946 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1947 | if (IS_ERR(req)) |
1948 | return PTR_ERR(req); | |
92a8780e MS |
1949 | |
1950 | memset(&inarg, 0, sizeof(inarg)); | |
1951 | inarg.size = size; | |
1952 | req->in.h.opcode = FUSE_LISTXATTR; | |
1953 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1954 | req->in.numargs = 1; |
1955 | req->in.args[0].size = sizeof(inarg); | |
1956 | req->in.args[0].value = &inarg; | |
1957 | /* This is really two different operations rolled into one */ | |
1958 | req->out.numargs = 1; | |
1959 | if (size) { | |
1960 | req->out.argvar = 1; | |
1961 | req->out.args[0].size = size; | |
1962 | req->out.args[0].value = list; | |
1963 | } else { | |
1964 | req->out.args[0].size = sizeof(outarg); | |
1965 | req->out.args[0].value = &outarg; | |
1966 | } | |
b93f858a | 1967 | fuse_request_send(fc, req); |
92a8780e MS |
1968 | ret = req->out.h.error; |
1969 | if (!ret) | |
1970 | ret = size ? req->out.args[0].size : outarg.size; | |
1971 | else { | |
1972 | if (ret == -ENOSYS) { | |
1973 | fc->no_listxattr = 1; | |
1974 | ret = -EOPNOTSUPP; | |
1975 | } | |
1976 | } | |
1977 | fuse_put_request(fc, req); | |
1978 | return ret; | |
1979 | } | |
1980 | ||
1981 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1982 | { | |
1983 | struct inode *inode = entry->d_inode; | |
1984 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1985 | struct fuse_req *req; | |
1986 | int err; | |
1987 | ||
1988 | if (fc->no_removexattr) | |
1989 | return -EOPNOTSUPP; | |
1990 | ||
b111c8c0 | 1991 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1992 | if (IS_ERR(req)) |
1993 | return PTR_ERR(req); | |
92a8780e MS |
1994 | |
1995 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1996 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1997 | req->in.numargs = 1; |
1998 | req->in.args[0].size = strlen(name) + 1; | |
1999 | req->in.args[0].value = name; | |
b93f858a | 2000 | fuse_request_send(fc, req); |
92a8780e MS |
2001 | err = req->out.h.error; |
2002 | fuse_put_request(fc, req); | |
2003 | if (err == -ENOSYS) { | |
2004 | fc->no_removexattr = 1; | |
2005 | err = -EOPNOTSUPP; | |
2006 | } | |
31f3267b | 2007 | if (!err) { |
d331a415 | 2008 | fuse_invalidate_attr(inode); |
31f3267b MP |
2009 | fuse_update_ctime(inode); |
2010 | } | |
92a8780e MS |
2011 | return err; |
2012 | } | |
2013 | ||
754661f1 | 2014 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 2015 | .lookup = fuse_lookup, |
9e6268db MS |
2016 | .mkdir = fuse_mkdir, |
2017 | .symlink = fuse_symlink, | |
2018 | .unlink = fuse_unlink, | |
2019 | .rmdir = fuse_rmdir, | |
2020 | .rename = fuse_rename, | |
1560c974 | 2021 | .rename2 = fuse_rename2, |
9e6268db MS |
2022 | .link = fuse_link, |
2023 | .setattr = fuse_setattr, | |
2024 | .create = fuse_create, | |
c8ccbe03 | 2025 | .atomic_open = fuse_atomic_open, |
9e6268db | 2026 | .mknod = fuse_mknod, |
e5e5558e MS |
2027 | .permission = fuse_permission, |
2028 | .getattr = fuse_getattr, | |
92a8780e MS |
2029 | .setxattr = fuse_setxattr, |
2030 | .getxattr = fuse_getxattr, | |
2031 | .listxattr = fuse_listxattr, | |
2032 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
2033 | }; |
2034 | ||
4b6f5d20 | 2035 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 2036 | .llseek = generic_file_llseek, |
e5e5558e | 2037 | .read = generic_read_dir, |
8d3af7f3 | 2038 | .iterate = fuse_readdir, |
e5e5558e MS |
2039 | .open = fuse_dir_open, |
2040 | .release = fuse_dir_release, | |
82547981 | 2041 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
2042 | .unlocked_ioctl = fuse_dir_ioctl, |
2043 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
2044 | }; |
2045 | ||
754661f1 | 2046 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 2047 | .setattr = fuse_setattr, |
e5e5558e MS |
2048 | .permission = fuse_permission, |
2049 | .getattr = fuse_getattr, | |
92a8780e MS |
2050 | .setxattr = fuse_setxattr, |
2051 | .getxattr = fuse_getxattr, | |
2052 | .listxattr = fuse_listxattr, | |
2053 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
2054 | }; |
2055 | ||
754661f1 | 2056 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 2057 | .setattr = fuse_setattr, |
e5e5558e MS |
2058 | .follow_link = fuse_follow_link, |
2059 | .put_link = fuse_put_link, | |
2060 | .readlink = generic_readlink, | |
2061 | .getattr = fuse_getattr, | |
92a8780e MS |
2062 | .setxattr = fuse_setxattr, |
2063 | .getxattr = fuse_getxattr, | |
2064 | .listxattr = fuse_listxattr, | |
2065 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
2066 | }; |
2067 | ||
2068 | void fuse_init_common(struct inode *inode) | |
2069 | { | |
2070 | inode->i_op = &fuse_common_inode_operations; | |
2071 | } | |
2072 | ||
2073 | void fuse_init_dir(struct inode *inode) | |
2074 | { | |
2075 | inode->i_op = &fuse_dir_inode_operations; | |
2076 | inode->i_fop = &fuse_dir_operations; | |
2077 | } | |
2078 | ||
2079 | void fuse_init_symlink(struct inode *inode) | |
2080 | { | |
2081 | inode->i_op = &fuse_symlink_inode_operations; | |
2082 | } |