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Commit | Line | Data |
---|---|---|
e5e5558e MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
e5e5558e MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/file.h> | |
e5e5558e MS |
13 | #include <linux/sched.h> |
14 | #include <linux/namei.h> | |
07e77dca | 15 | #include <linux/slab.h> |
703c7362 | 16 | #include <linux/xattr.h> |
60bcc88a | 17 | #include <linux/posix_acl.h> |
e5e5558e | 18 | |
8d3af7f3 | 19 | static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
4582a4ab FS |
20 | { |
21 | struct fuse_conn *fc = get_fuse_conn(dir); | |
22 | struct fuse_inode *fi = get_fuse_inode(dir); | |
23 | ||
24 | if (!fc->do_readdirplus) | |
25 | return false; | |
634734b6 EW |
26 | if (!fc->readdirplus_auto) |
27 | return true; | |
4582a4ab FS |
28 | if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state)) |
29 | return true; | |
8d3af7f3 | 30 | if (ctx->pos == 0) |
4582a4ab FS |
31 | return true; |
32 | return false; | |
33 | } | |
34 | ||
35 | static void fuse_advise_use_readdirplus(struct inode *dir) | |
36 | { | |
37 | struct fuse_inode *fi = get_fuse_inode(dir); | |
38 | ||
39 | set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state); | |
40 | } | |
41 | ||
0a0898cf MS |
42 | #if BITS_PER_LONG >= 64 |
43 | static inline void fuse_dentry_settime(struct dentry *entry, u64 time) | |
44 | { | |
45 | entry->d_time = time; | |
46 | } | |
47 | ||
48 | static inline u64 fuse_dentry_time(struct dentry *entry) | |
49 | { | |
50 | return entry->d_time; | |
51 | } | |
52 | #else | |
53 | /* | |
54 | * On 32 bit archs store the high 32 bits of time in d_fsdata | |
55 | */ | |
56 | static void fuse_dentry_settime(struct dentry *entry, u64 time) | |
57 | { | |
58 | entry->d_time = time; | |
59 | entry->d_fsdata = (void *) (unsigned long) (time >> 32); | |
60 | } | |
61 | ||
62 | static u64 fuse_dentry_time(struct dentry *entry) | |
63 | { | |
64 | return (u64) entry->d_time + | |
65 | ((u64) (unsigned long) entry->d_fsdata << 32); | |
66 | } | |
67 | #endif | |
68 | ||
6f9f1180 MS |
69 | /* |
70 | * FUSE caches dentries and attributes with separate timeout. The | |
71 | * time in jiffies until the dentry/attributes are valid is stored in | |
72 | * dentry->d_time and fuse_inode->i_time respectively. | |
73 | */ | |
74 | ||
75 | /* | |
76 | * Calculate the time in jiffies until a dentry/attributes are valid | |
77 | */ | |
0a0898cf | 78 | static u64 time_to_jiffies(unsigned long sec, unsigned long nsec) |
e5e5558e | 79 | { |
685d16dd MS |
80 | if (sec || nsec) { |
81 | struct timespec ts = {sec, nsec}; | |
0a0898cf | 82 | return get_jiffies_64() + timespec_to_jiffies(&ts); |
685d16dd | 83 | } else |
0a0898cf | 84 | return 0; |
e5e5558e MS |
85 | } |
86 | ||
6f9f1180 MS |
87 | /* |
88 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
89 | * replies | |
90 | */ | |
1fb69e78 MS |
91 | static void fuse_change_entry_timeout(struct dentry *entry, |
92 | struct fuse_entry_out *o) | |
0aa7c699 | 93 | { |
0a0898cf MS |
94 | fuse_dentry_settime(entry, |
95 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
1fb69e78 MS |
96 | } |
97 | ||
98 | static u64 attr_timeout(struct fuse_attr_out *o) | |
99 | { | |
100 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
101 | } | |
102 | ||
103 | static u64 entry_attr_timeout(struct fuse_entry_out *o) | |
104 | { | |
105 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
8cbdf1e6 MS |
106 | } |
107 | ||
6f9f1180 MS |
108 | /* |
109 | * Mark the attributes as stale, so that at the next call to | |
110 | * ->getattr() they will be fetched from userspace | |
111 | */ | |
8cbdf1e6 MS |
112 | void fuse_invalidate_attr(struct inode *inode) |
113 | { | |
0a0898cf | 114 | get_fuse_inode(inode)->i_time = 0; |
8cbdf1e6 MS |
115 | } |
116 | ||
451418fc AG |
117 | /** |
118 | * Mark the attributes as stale due to an atime change. Avoid the invalidate if | |
119 | * atime is not used. | |
120 | */ | |
121 | void fuse_invalidate_atime(struct inode *inode) | |
122 | { | |
123 | if (!IS_RDONLY(inode)) | |
124 | fuse_invalidate_attr(inode); | |
125 | } | |
126 | ||
6f9f1180 MS |
127 | /* |
128 | * Just mark the entry as stale, so that a next attempt to look it up | |
129 | * will result in a new lookup call to userspace | |
130 | * | |
131 | * This is called when a dentry is about to become negative and the | |
132 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
133 | * lookup) | |
134 | */ | |
dbd561d2 | 135 | void fuse_invalidate_entry_cache(struct dentry *entry) |
8cbdf1e6 | 136 | { |
0a0898cf | 137 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
138 | } |
139 | ||
6f9f1180 MS |
140 | /* |
141 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
142 | * dentry from the hash | |
143 | */ | |
8cbdf1e6 MS |
144 | static void fuse_invalidate_entry(struct dentry *entry) |
145 | { | |
146 | d_invalidate(entry); | |
147 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
148 | } |
149 | ||
7078187a | 150 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, |
13983d06 | 151 | u64 nodeid, const struct qstr *name, |
e5e5558e MS |
152 | struct fuse_entry_out *outarg) |
153 | { | |
0e9663ee | 154 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
7078187a MS |
155 | args->in.h.opcode = FUSE_LOOKUP; |
156 | args->in.h.nodeid = nodeid; | |
157 | args->in.numargs = 1; | |
158 | args->in.args[0].size = name->len + 1; | |
159 | args->in.args[0].value = name->name; | |
160 | args->out.numargs = 1; | |
21f62174 | 161 | args->out.args[0].size = sizeof(struct fuse_entry_out); |
7078187a | 162 | args->out.args[0].value = outarg; |
e5e5558e MS |
163 | } |
164 | ||
5c5c5e51 | 165 | u64 fuse_get_attr_version(struct fuse_conn *fc) |
7dca9fd3 MS |
166 | { |
167 | u64 curr_version; | |
168 | ||
169 | /* | |
170 | * The spin lock isn't actually needed on 64bit archs, but we | |
171 | * don't yet care too much about such optimizations. | |
172 | */ | |
173 | spin_lock(&fc->lock); | |
174 | curr_version = fc->attr_version; | |
175 | spin_unlock(&fc->lock); | |
176 | ||
177 | return curr_version; | |
178 | } | |
179 | ||
6f9f1180 MS |
180 | /* |
181 | * Check whether the dentry is still valid | |
182 | * | |
183 | * If the entry validity timeout has expired and the dentry is | |
184 | * positive, try to redo the lookup. If the lookup results in a | |
185 | * different inode, then let the VFS invalidate the dentry and redo | |
186 | * the lookup once more. If the lookup results in the same inode, | |
187 | * then refresh the attributes, timeouts and mark the dentry valid. | |
188 | */ | |
0b728e19 | 189 | static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) |
e5e5558e | 190 | { |
34286d66 | 191 | struct inode *inode; |
28420dad MS |
192 | struct dentry *parent; |
193 | struct fuse_conn *fc; | |
6314efee | 194 | struct fuse_inode *fi; |
e2a6b952 | 195 | int ret; |
8cbdf1e6 | 196 | |
2b0143b5 | 197 | inode = d_inode_rcu(entry); |
8cbdf1e6 | 198 | if (inode && is_bad_inode(inode)) |
e2a6b952 | 199 | goto invalid; |
154210cc AA |
200 | else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) || |
201 | (flags & LOOKUP_REVAL)) { | |
e5e5558e | 202 | struct fuse_entry_out outarg; |
7078187a | 203 | FUSE_ARGS(args); |
07e77dca | 204 | struct fuse_forget_link *forget; |
1fb69e78 | 205 | u64 attr_version; |
8cbdf1e6 | 206 | |
50322fe7 | 207 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 | 208 | if (!inode) |
e2a6b952 | 209 | goto invalid; |
8cbdf1e6 | 210 | |
e2a6b952 | 211 | ret = -ECHILD; |
0b728e19 | 212 | if (flags & LOOKUP_RCU) |
e2a6b952 | 213 | goto out; |
e7c0a167 | 214 | |
8cbdf1e6 | 215 | fc = get_fuse_conn(inode); |
e5e5558e | 216 | |
07e77dca | 217 | forget = fuse_alloc_forget(); |
7078187a MS |
218 | ret = -ENOMEM; |
219 | if (!forget) | |
e2a6b952 | 220 | goto out; |
2d51013e | 221 | |
7dca9fd3 | 222 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 223 | |
e956edd0 | 224 | parent = dget_parent(entry); |
2b0143b5 | 225 | fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)), |
c180eebe | 226 | &entry->d_name, &outarg); |
7078187a | 227 | ret = fuse_simple_request(fc, &args); |
e956edd0 | 228 | dput(parent); |
50322fe7 | 229 | /* Zero nodeid is same as -ENOENT */ |
7078187a MS |
230 | if (!ret && !outarg.nodeid) |
231 | ret = -ENOENT; | |
232 | if (!ret) { | |
6314efee | 233 | fi = get_fuse_inode(inode); |
9e6268db | 234 | if (outarg.nodeid != get_node_id(inode)) { |
07e77dca | 235 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
e2a6b952 | 236 | goto invalid; |
9e6268db | 237 | } |
8da5ff23 | 238 | spin_lock(&fc->lock); |
1729a16c | 239 | fi->nlookup++; |
8da5ff23 | 240 | spin_unlock(&fc->lock); |
9e6268db | 241 | } |
07e77dca | 242 | kfree(forget); |
7078187a MS |
243 | if (ret == -ENOMEM) |
244 | goto out; | |
245 | if (ret || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) | |
e2a6b952 | 246 | goto invalid; |
e5e5558e | 247 | |
60bcc88a | 248 | forget_all_cached_acls(inode); |
1fb69e78 MS |
249 | fuse_change_attributes(inode, &outarg.attr, |
250 | entry_attr_timeout(&outarg), | |
251 | attr_version); | |
252 | fuse_change_entry_timeout(entry, &outarg); | |
28420dad | 253 | } else if (inode) { |
6314efee MS |
254 | fi = get_fuse_inode(inode); |
255 | if (flags & LOOKUP_RCU) { | |
256 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) | |
257 | return -ECHILD; | |
258 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { | |
28420dad | 259 | parent = dget_parent(entry); |
2b0143b5 | 260 | fuse_advise_use_readdirplus(d_inode(parent)); |
28420dad MS |
261 | dput(parent); |
262 | } | |
e5e5558e | 263 | } |
e2a6b952 MS |
264 | ret = 1; |
265 | out: | |
266 | return ret; | |
267 | ||
268 | invalid: | |
269 | ret = 0; | |
270 | goto out; | |
e5e5558e MS |
271 | } |
272 | ||
8bfc016d | 273 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
274 | { |
275 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
276 | } | |
277 | ||
4269590a | 278 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e MS |
279 | .d_revalidate = fuse_dentry_revalidate, |
280 | }; | |
281 | ||
a5bfffac | 282 | int fuse_valid_type(int m) |
39ee059a MS |
283 | { |
284 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
285 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
286 | } | |
287 | ||
13983d06 | 288 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name, |
c180eebe | 289 | struct fuse_entry_out *outarg, struct inode **inode) |
e5e5558e | 290 | { |
c180eebe | 291 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 292 | FUSE_ARGS(args); |
07e77dca | 293 | struct fuse_forget_link *forget; |
1fb69e78 | 294 | u64 attr_version; |
c180eebe | 295 | int err; |
e5e5558e | 296 | |
c180eebe MS |
297 | *inode = NULL; |
298 | err = -ENAMETOOLONG; | |
299 | if (name->len > FUSE_NAME_MAX) | |
300 | goto out; | |
e5e5558e | 301 | |
e5e5558e | 302 | |
07e77dca MS |
303 | forget = fuse_alloc_forget(); |
304 | err = -ENOMEM; | |
7078187a | 305 | if (!forget) |
c180eebe | 306 | goto out; |
2d51013e | 307 | |
7dca9fd3 | 308 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 309 | |
7078187a MS |
310 | fuse_lookup_init(fc, &args, nodeid, name, outarg); |
311 | err = fuse_simple_request(fc, &args); | |
50322fe7 | 312 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
313 | if (err || !outarg->nodeid) |
314 | goto out_put_forget; | |
315 | ||
316 | err = -EIO; | |
317 | if (!outarg->nodeid) | |
318 | goto out_put_forget; | |
319 | if (!fuse_valid_type(outarg->attr.mode)) | |
320 | goto out_put_forget; | |
321 | ||
322 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
323 | &outarg->attr, entry_attr_timeout(outarg), | |
324 | attr_version); | |
325 | err = -ENOMEM; | |
326 | if (!*inode) { | |
07e77dca | 327 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
c180eebe | 328 | goto out; |
e5e5558e | 329 | } |
c180eebe MS |
330 | err = 0; |
331 | ||
332 | out_put_forget: | |
07e77dca | 333 | kfree(forget); |
c180eebe MS |
334 | out: |
335 | return err; | |
336 | } | |
337 | ||
338 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 339 | unsigned int flags) |
c180eebe MS |
340 | { |
341 | int err; | |
342 | struct fuse_entry_out outarg; | |
343 | struct inode *inode; | |
344 | struct dentry *newent; | |
c180eebe MS |
345 | bool outarg_valid = true; |
346 | ||
5c672ab3 | 347 | fuse_lock_inode(dir); |
c180eebe MS |
348 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, |
349 | &outarg, &inode); | |
5c672ab3 | 350 | fuse_unlock_inode(dir); |
c180eebe MS |
351 | if (err == -ENOENT) { |
352 | outarg_valid = false; | |
353 | err = 0; | |
354 | } | |
355 | if (err) | |
356 | goto out_err; | |
357 | ||
358 | err = -EIO; | |
359 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
360 | goto out_iput; | |
e5e5558e | 361 | |
41d28bca | 362 | newent = d_splice_alias(inode, entry); |
5835f339 MS |
363 | err = PTR_ERR(newent); |
364 | if (IS_ERR(newent)) | |
365 | goto out_err; | |
d2a85164 | 366 | |
0de6256d | 367 | entry = newent ? newent : entry; |
c180eebe | 368 | if (outarg_valid) |
1fb69e78 | 369 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
370 | else |
371 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 372 | |
4582a4ab | 373 | fuse_advise_use_readdirplus(dir); |
0de6256d | 374 | return newent; |
c180eebe MS |
375 | |
376 | out_iput: | |
377 | iput(inode); | |
378 | out_err: | |
379 | return ERR_PTR(err); | |
e5e5558e MS |
380 | } |
381 | ||
6f9f1180 MS |
382 | /* |
383 | * Atomic create+open operation | |
384 | * | |
385 | * If the filesystem doesn't support this, then fall back to separate | |
386 | * 'mknod' + 'open' requests. | |
387 | */ | |
d9585277 | 388 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 389 | struct file *file, unsigned flags, |
d9585277 | 390 | umode_t mode, int *opened) |
fd72faac MS |
391 | { |
392 | int err; | |
393 | struct inode *inode; | |
394 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 395 | FUSE_ARGS(args); |
07e77dca | 396 | struct fuse_forget_link *forget; |
e0a43ddc | 397 | struct fuse_create_in inarg; |
fd72faac MS |
398 | struct fuse_open_out outopen; |
399 | struct fuse_entry_out outentry; | |
fd72faac | 400 | struct fuse_file *ff; |
fd72faac | 401 | |
af109bca MS |
402 | /* Userspace expects S_IFREG in create mode */ |
403 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
404 | ||
07e77dca | 405 | forget = fuse_alloc_forget(); |
c8ccbe03 | 406 | err = -ENOMEM; |
07e77dca | 407 | if (!forget) |
c8ccbe03 | 408 | goto out_err; |
51eb01e7 | 409 | |
ce1d5a49 | 410 | err = -ENOMEM; |
acf99433 | 411 | ff = fuse_file_alloc(fc); |
fd72faac | 412 | if (!ff) |
7078187a | 413 | goto out_put_forget_req; |
fd72faac | 414 | |
e0a43ddc MS |
415 | if (!fc->dont_mask) |
416 | mode &= ~current_umask(); | |
417 | ||
fd72faac MS |
418 | flags &= ~O_NOCTTY; |
419 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 420 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
421 | inarg.flags = flags; |
422 | inarg.mode = mode; | |
e0a43ddc | 423 | inarg.umask = current_umask(); |
7078187a MS |
424 | args.in.h.opcode = FUSE_CREATE; |
425 | args.in.h.nodeid = get_node_id(dir); | |
426 | args.in.numargs = 2; | |
21f62174 | 427 | args.in.args[0].size = sizeof(inarg); |
7078187a MS |
428 | args.in.args[0].value = &inarg; |
429 | args.in.args[1].size = entry->d_name.len + 1; | |
430 | args.in.args[1].value = entry->d_name.name; | |
431 | args.out.numargs = 2; | |
21f62174 | 432 | args.out.args[0].size = sizeof(outentry); |
7078187a MS |
433 | args.out.args[0].value = &outentry; |
434 | args.out.args[1].size = sizeof(outopen); | |
435 | args.out.args[1].value = &outopen; | |
436 | err = fuse_simple_request(fc, &args); | |
c8ccbe03 | 437 | if (err) |
fd72faac | 438 | goto out_free_ff; |
fd72faac MS |
439 | |
440 | err = -EIO; | |
2827d0b2 | 441 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
442 | goto out_free_ff; |
443 | ||
c7b7143c MS |
444 | ff->fh = outopen.fh; |
445 | ff->nodeid = outentry.nodeid; | |
446 | ff->open_flags = outopen.open_flags; | |
fd72faac | 447 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 448 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
449 | if (!inode) { |
450 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 451 | fuse_sync_release(ff, flags); |
07e77dca | 452 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
453 | err = -ENOMEM; |
454 | goto out_err; | |
fd72faac | 455 | } |
07e77dca | 456 | kfree(forget); |
fd72faac | 457 | d_instantiate(entry, inode); |
1fb69e78 | 458 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 459 | fuse_invalidate_attr(dir); |
30d90494 AV |
460 | err = finish_open(file, entry, generic_file_open, opened); |
461 | if (err) { | |
8b0797a4 | 462 | fuse_sync_release(ff, flags); |
c8ccbe03 MS |
463 | } else { |
464 | file->private_data = fuse_file_get(ff); | |
465 | fuse_finish_open(inode, file); | |
fd72faac | 466 | } |
d9585277 | 467 | return err; |
fd72faac | 468 | |
c8ccbe03 | 469 | out_free_ff: |
fd72faac | 470 | fuse_file_free(ff); |
c8ccbe03 | 471 | out_put_forget_req: |
07e77dca | 472 | kfree(forget); |
c8ccbe03 | 473 | out_err: |
d9585277 | 474 | return err; |
c8ccbe03 MS |
475 | } |
476 | ||
477 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 478 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 479 | struct file *file, unsigned flags, |
d9585277 | 480 | umode_t mode, int *opened) |
c8ccbe03 MS |
481 | { |
482 | int err; | |
483 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
484 | struct dentry *res = NULL; |
485 | ||
00699ad8 | 486 | if (d_in_lookup(entry)) { |
00cd8dd3 | 487 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 488 | if (IS_ERR(res)) |
d9585277 | 489 | return PTR_ERR(res); |
c8ccbe03 MS |
490 | |
491 | if (res) | |
492 | entry = res; | |
493 | } | |
494 | ||
2b0143b5 | 495 | if (!(flags & O_CREAT) || d_really_is_positive(entry)) |
c8ccbe03 MS |
496 | goto no_open; |
497 | ||
498 | /* Only creates */ | |
47237687 | 499 | *opened |= FILE_CREATED; |
c8ccbe03 MS |
500 | |
501 | if (fc->no_create) | |
502 | goto mknod; | |
503 | ||
30d90494 | 504 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
d9585277 | 505 | if (err == -ENOSYS) { |
c8ccbe03 MS |
506 | fc->no_create = 1; |
507 | goto mknod; | |
508 | } | |
509 | out_dput: | |
510 | dput(res); | |
d9585277 | 511 | return err; |
c8ccbe03 MS |
512 | |
513 | mknod: | |
514 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 515 | if (err) |
c8ccbe03 | 516 | goto out_dput; |
c8ccbe03 | 517 | no_open: |
e45198a6 | 518 | return finish_no_open(file, res); |
fd72faac MS |
519 | } |
520 | ||
6f9f1180 MS |
521 | /* |
522 | * Code shared between mknod, mkdir, symlink and link | |
523 | */ | |
7078187a | 524 | static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args, |
9e6268db | 525 | struct inode *dir, struct dentry *entry, |
541af6a0 | 526 | umode_t mode) |
9e6268db MS |
527 | { |
528 | struct fuse_entry_out outarg; | |
529 | struct inode *inode; | |
9e6268db | 530 | int err; |
07e77dca | 531 | struct fuse_forget_link *forget; |
2d51013e | 532 | |
07e77dca | 533 | forget = fuse_alloc_forget(); |
7078187a | 534 | if (!forget) |
07e77dca | 535 | return -ENOMEM; |
9e6268db | 536 | |
0e9663ee | 537 | memset(&outarg, 0, sizeof(outarg)); |
7078187a MS |
538 | args->in.h.nodeid = get_node_id(dir); |
539 | args->out.numargs = 1; | |
21f62174 | 540 | args->out.args[0].size = sizeof(outarg); |
7078187a MS |
541 | args->out.args[0].value = &outarg; |
542 | err = fuse_simple_request(fc, args); | |
2d51013e MS |
543 | if (err) |
544 | goto out_put_forget_req; | |
545 | ||
39ee059a MS |
546 | err = -EIO; |
547 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 548 | goto out_put_forget_req; |
39ee059a MS |
549 | |
550 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 551 | goto out_put_forget_req; |
39ee059a | 552 | |
9e6268db | 553 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 554 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 555 | if (!inode) { |
07e77dca | 556 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
557 | return -ENOMEM; |
558 | } | |
07e77dca | 559 | kfree(forget); |
9e6268db | 560 | |
b70a80e7 MS |
561 | err = d_instantiate_no_diralias(entry, inode); |
562 | if (err) | |
563 | return err; | |
9e6268db | 564 | |
1fb69e78 | 565 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
566 | fuse_invalidate_attr(dir); |
567 | return 0; | |
39ee059a | 568 | |
2d51013e | 569 | out_put_forget_req: |
07e77dca | 570 | kfree(forget); |
39ee059a | 571 | return err; |
9e6268db MS |
572 | } |
573 | ||
1a67aafb | 574 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
575 | dev_t rdev) |
576 | { | |
577 | struct fuse_mknod_in inarg; | |
578 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 579 | FUSE_ARGS(args); |
9e6268db | 580 | |
e0a43ddc MS |
581 | if (!fc->dont_mask) |
582 | mode &= ~current_umask(); | |
583 | ||
9e6268db MS |
584 | memset(&inarg, 0, sizeof(inarg)); |
585 | inarg.mode = mode; | |
586 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 587 | inarg.umask = current_umask(); |
7078187a MS |
588 | args.in.h.opcode = FUSE_MKNOD; |
589 | args.in.numargs = 2; | |
21f62174 | 590 | args.in.args[0].size = sizeof(inarg); |
7078187a MS |
591 | args.in.args[0].value = &inarg; |
592 | args.in.args[1].size = entry->d_name.len + 1; | |
593 | args.in.args[1].value = entry->d_name.name; | |
594 | return create_new_entry(fc, &args, dir, entry, mode); | |
9e6268db MS |
595 | } |
596 | ||
4acdaf27 | 597 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
ebfc3b49 | 598 | bool excl) |
9e6268db MS |
599 | { |
600 | return fuse_mknod(dir, entry, mode, 0); | |
601 | } | |
602 | ||
18bb1db3 | 603 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
604 | { |
605 | struct fuse_mkdir_in inarg; | |
606 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 607 | FUSE_ARGS(args); |
9e6268db | 608 | |
e0a43ddc MS |
609 | if (!fc->dont_mask) |
610 | mode &= ~current_umask(); | |
611 | ||
9e6268db MS |
612 | memset(&inarg, 0, sizeof(inarg)); |
613 | inarg.mode = mode; | |
e0a43ddc | 614 | inarg.umask = current_umask(); |
7078187a MS |
615 | args.in.h.opcode = FUSE_MKDIR; |
616 | args.in.numargs = 2; | |
617 | args.in.args[0].size = sizeof(inarg); | |
618 | args.in.args[0].value = &inarg; | |
619 | args.in.args[1].size = entry->d_name.len + 1; | |
620 | args.in.args[1].value = entry->d_name.name; | |
621 | return create_new_entry(fc, &args, dir, entry, S_IFDIR); | |
9e6268db MS |
622 | } |
623 | ||
624 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
625 | const char *link) | |
626 | { | |
627 | struct fuse_conn *fc = get_fuse_conn(dir); | |
628 | unsigned len = strlen(link) + 1; | |
7078187a | 629 | FUSE_ARGS(args); |
9e6268db | 630 | |
7078187a MS |
631 | args.in.h.opcode = FUSE_SYMLINK; |
632 | args.in.numargs = 2; | |
633 | args.in.args[0].size = entry->d_name.len + 1; | |
634 | args.in.args[0].value = entry->d_name.name; | |
635 | args.in.args[1].size = len; | |
636 | args.in.args[1].value = link; | |
637 | return create_new_entry(fc, &args, dir, entry, S_IFLNK); | |
9e6268db MS |
638 | } |
639 | ||
703c7362 | 640 | void fuse_update_ctime(struct inode *inode) |
31f3267b MP |
641 | { |
642 | if (!IS_NOCMTIME(inode)) { | |
643 | inode->i_ctime = current_fs_time(inode->i_sb); | |
644 | mark_inode_dirty_sync(inode); | |
645 | } | |
646 | } | |
647 | ||
9e6268db MS |
648 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
649 | { | |
650 | int err; | |
651 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a MS |
652 | FUSE_ARGS(args); |
653 | ||
654 | args.in.h.opcode = FUSE_UNLINK; | |
655 | args.in.h.nodeid = get_node_id(dir); | |
656 | args.in.numargs = 1; | |
657 | args.in.args[0].size = entry->d_name.len + 1; | |
658 | args.in.args[0].value = entry->d_name.name; | |
659 | err = fuse_simple_request(fc, &args); | |
9e6268db | 660 | if (!err) { |
2b0143b5 | 661 | struct inode *inode = d_inode(entry); |
ac45d613 | 662 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 663 | |
ac45d613 MS |
664 | spin_lock(&fc->lock); |
665 | fi->attr_version = ++fc->attr_version; | |
dfca7ceb MS |
666 | /* |
667 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
668 | * happen if userspace filesystem is careless. It would be | |
669 | * difficult to enforce correct nlink usage so just ignore this | |
670 | * condition here | |
671 | */ | |
672 | if (inode->i_nlink > 0) | |
673 | drop_nlink(inode); | |
ac45d613 | 674 | spin_unlock(&fc->lock); |
9e6268db MS |
675 | fuse_invalidate_attr(inode); |
676 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 677 | fuse_invalidate_entry_cache(entry); |
31f3267b | 678 | fuse_update_ctime(inode); |
9e6268db MS |
679 | } else if (err == -EINTR) |
680 | fuse_invalidate_entry(entry); | |
681 | return err; | |
682 | } | |
683 | ||
684 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
685 | { | |
686 | int err; | |
687 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a MS |
688 | FUSE_ARGS(args); |
689 | ||
690 | args.in.h.opcode = FUSE_RMDIR; | |
691 | args.in.h.nodeid = get_node_id(dir); | |
692 | args.in.numargs = 1; | |
693 | args.in.args[0].size = entry->d_name.len + 1; | |
694 | args.in.args[0].value = entry->d_name.name; | |
695 | err = fuse_simple_request(fc, &args); | |
9e6268db | 696 | if (!err) { |
2b0143b5 | 697 | clear_nlink(d_inode(entry)); |
9e6268db | 698 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 699 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
700 | } else if (err == -EINTR) |
701 | fuse_invalidate_entry(entry); | |
702 | return err; | |
703 | } | |
704 | ||
1560c974 MS |
705 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
706 | struct inode *newdir, struct dentry *newent, | |
707 | unsigned int flags, int opcode, size_t argsize) | |
9e6268db MS |
708 | { |
709 | int err; | |
1560c974 | 710 | struct fuse_rename2_in inarg; |
9e6268db | 711 | struct fuse_conn *fc = get_fuse_conn(olddir); |
7078187a | 712 | FUSE_ARGS(args); |
9e6268db | 713 | |
1560c974 | 714 | memset(&inarg, 0, argsize); |
9e6268db | 715 | inarg.newdir = get_node_id(newdir); |
1560c974 | 716 | inarg.flags = flags; |
7078187a MS |
717 | args.in.h.opcode = opcode; |
718 | args.in.h.nodeid = get_node_id(olddir); | |
719 | args.in.numargs = 3; | |
720 | args.in.args[0].size = argsize; | |
721 | args.in.args[0].value = &inarg; | |
722 | args.in.args[1].size = oldent->d_name.len + 1; | |
723 | args.in.args[1].value = oldent->d_name.name; | |
724 | args.in.args[2].size = newent->d_name.len + 1; | |
725 | args.in.args[2].value = newent->d_name.name; | |
726 | err = fuse_simple_request(fc, &args); | |
9e6268db | 727 | if (!err) { |
08b63307 | 728 | /* ctime changes */ |
2b0143b5 DH |
729 | fuse_invalidate_attr(d_inode(oldent)); |
730 | fuse_update_ctime(d_inode(oldent)); | |
08b63307 | 731 | |
1560c974 | 732 | if (flags & RENAME_EXCHANGE) { |
2b0143b5 DH |
733 | fuse_invalidate_attr(d_inode(newent)); |
734 | fuse_update_ctime(d_inode(newent)); | |
1560c974 MS |
735 | } |
736 | ||
9e6268db MS |
737 | fuse_invalidate_attr(olddir); |
738 | if (olddir != newdir) | |
739 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
740 | |
741 | /* newent will end up negative */ | |
2b0143b5 DH |
742 | if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) { |
743 | fuse_invalidate_attr(d_inode(newent)); | |
8cbdf1e6 | 744 | fuse_invalidate_entry_cache(newent); |
2b0143b5 | 745 | fuse_update_ctime(d_inode(newent)); |
5219f346 | 746 | } |
9e6268db MS |
747 | } else if (err == -EINTR) { |
748 | /* If request was interrupted, DEITY only knows if the | |
749 | rename actually took place. If the invalidation | |
750 | fails (e.g. some process has CWD under the renamed | |
751 | directory), then there can be inconsistency between | |
752 | the dcache and the real filesystem. Tough luck. */ | |
753 | fuse_invalidate_entry(oldent); | |
2b0143b5 | 754 | if (d_really_is_positive(newent)) |
9e6268db MS |
755 | fuse_invalidate_entry(newent); |
756 | } | |
757 | ||
758 | return err; | |
759 | } | |
760 | ||
1560c974 MS |
761 | static int fuse_rename2(struct inode *olddir, struct dentry *oldent, |
762 | struct inode *newdir, struct dentry *newent, | |
763 | unsigned int flags) | |
764 | { | |
765 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
766 | int err; | |
767 | ||
768 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) | |
769 | return -EINVAL; | |
770 | ||
4237ba43 MS |
771 | if (flags) { |
772 | if (fc->no_rename2 || fc->minor < 23) | |
773 | return -EINVAL; | |
1560c974 | 774 | |
4237ba43 MS |
775 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, |
776 | FUSE_RENAME2, | |
777 | sizeof(struct fuse_rename2_in)); | |
778 | if (err == -ENOSYS) { | |
779 | fc->no_rename2 = 1; | |
780 | err = -EINVAL; | |
781 | } | |
782 | } else { | |
783 | err = fuse_rename_common(olddir, oldent, newdir, newent, 0, | |
784 | FUSE_RENAME, | |
785 | sizeof(struct fuse_rename_in)); | |
1560c974 | 786 | } |
4237ba43 | 787 | |
1560c974 | 788 | return err; |
4237ba43 | 789 | } |
1560c974 | 790 | |
9e6268db MS |
791 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
792 | struct dentry *newent) | |
793 | { | |
794 | int err; | |
795 | struct fuse_link_in inarg; | |
2b0143b5 | 796 | struct inode *inode = d_inode(entry); |
9e6268db | 797 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 798 | FUSE_ARGS(args); |
9e6268db MS |
799 | |
800 | memset(&inarg, 0, sizeof(inarg)); | |
801 | inarg.oldnodeid = get_node_id(inode); | |
7078187a MS |
802 | args.in.h.opcode = FUSE_LINK; |
803 | args.in.numargs = 2; | |
804 | args.in.args[0].size = sizeof(inarg); | |
805 | args.in.args[0].value = &inarg; | |
806 | args.in.args[1].size = newent->d_name.len + 1; | |
807 | args.in.args[1].value = newent->d_name.name; | |
808 | err = create_new_entry(fc, &args, newdir, newent, inode->i_mode); | |
9e6268db MS |
809 | /* Contrary to "normal" filesystems it can happen that link |
810 | makes two "logical" inodes point to the same "physical" | |
811 | inode. We invalidate the attributes of the old one, so it | |
812 | will reflect changes in the backing inode (link count, | |
813 | etc.) | |
814 | */ | |
ac45d613 MS |
815 | if (!err) { |
816 | struct fuse_inode *fi = get_fuse_inode(inode); | |
817 | ||
818 | spin_lock(&fc->lock); | |
819 | fi->attr_version = ++fc->attr_version; | |
820 | inc_nlink(inode); | |
821 | spin_unlock(&fc->lock); | |
9e6268db | 822 | fuse_invalidate_attr(inode); |
31f3267b | 823 | fuse_update_ctime(inode); |
ac45d613 MS |
824 | } else if (err == -EINTR) { |
825 | fuse_invalidate_attr(inode); | |
826 | } | |
9e6268db MS |
827 | return err; |
828 | } | |
829 | ||
1fb69e78 MS |
830 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
831 | struct kstat *stat) | |
832 | { | |
203627bb | 833 | unsigned int blkbits; |
8373200b PE |
834 | struct fuse_conn *fc = get_fuse_conn(inode); |
835 | ||
836 | /* see the comment in fuse_change_attributes() */ | |
b0aa7606 | 837 | if (fc->writeback_cache && S_ISREG(inode->i_mode)) { |
8373200b | 838 | attr->size = i_size_read(inode); |
b0aa7606 MP |
839 | attr->mtime = inode->i_mtime.tv_sec; |
840 | attr->mtimensec = inode->i_mtime.tv_nsec; | |
31f3267b MP |
841 | attr->ctime = inode->i_ctime.tv_sec; |
842 | attr->ctimensec = inode->i_ctime.tv_nsec; | |
b0aa7606 | 843 | } |
203627bb | 844 | |
1fb69e78 MS |
845 | stat->dev = inode->i_sb->s_dev; |
846 | stat->ino = attr->ino; | |
847 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
848 | stat->nlink = attr->nlink; | |
499dcf20 EB |
849 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
850 | stat->gid = make_kgid(&init_user_ns, attr->gid); | |
1fb69e78 MS |
851 | stat->rdev = inode->i_rdev; |
852 | stat->atime.tv_sec = attr->atime; | |
853 | stat->atime.tv_nsec = attr->atimensec; | |
854 | stat->mtime.tv_sec = attr->mtime; | |
855 | stat->mtime.tv_nsec = attr->mtimensec; | |
856 | stat->ctime.tv_sec = attr->ctime; | |
857 | stat->ctime.tv_nsec = attr->ctimensec; | |
858 | stat->size = attr->size; | |
859 | stat->blocks = attr->blocks; | |
203627bb MS |
860 | |
861 | if (attr->blksize != 0) | |
862 | blkbits = ilog2(attr->blksize); | |
863 | else | |
864 | blkbits = inode->i_sb->s_blocksize_bits; | |
865 | ||
866 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
867 | } |
868 | ||
c79e322f MS |
869 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
870 | struct file *file) | |
e5e5558e MS |
871 | { |
872 | int err; | |
c79e322f MS |
873 | struct fuse_getattr_in inarg; |
874 | struct fuse_attr_out outarg; | |
e5e5558e | 875 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 876 | FUSE_ARGS(args); |
1fb69e78 MS |
877 | u64 attr_version; |
878 | ||
7dca9fd3 | 879 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 880 | |
c79e322f | 881 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 882 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
883 | /* Directories have separate file-handle space */ |
884 | if (file && S_ISREG(inode->i_mode)) { | |
885 | struct fuse_file *ff = file->private_data; | |
886 | ||
887 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
888 | inarg.fh = ff->fh; | |
889 | } | |
7078187a MS |
890 | args.in.h.opcode = FUSE_GETATTR; |
891 | args.in.h.nodeid = get_node_id(inode); | |
892 | args.in.numargs = 1; | |
893 | args.in.args[0].size = sizeof(inarg); | |
894 | args.in.args[0].value = &inarg; | |
895 | args.out.numargs = 1; | |
21f62174 | 896 | args.out.args[0].size = sizeof(outarg); |
7078187a MS |
897 | args.out.args[0].value = &outarg; |
898 | err = fuse_simple_request(fc, &args); | |
e5e5558e | 899 | if (!err) { |
c79e322f | 900 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
901 | make_bad_inode(inode); |
902 | err = -EIO; | |
903 | } else { | |
c79e322f MS |
904 | fuse_change_attributes(inode, &outarg.attr, |
905 | attr_timeout(&outarg), | |
1fb69e78 MS |
906 | attr_version); |
907 | if (stat) | |
c79e322f | 908 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
909 | } |
910 | } | |
911 | return err; | |
912 | } | |
913 | ||
bcb4be80 MS |
914 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
915 | struct file *file, bool *refreshed) | |
916 | { | |
917 | struct fuse_inode *fi = get_fuse_inode(inode); | |
918 | int err; | |
919 | bool r; | |
920 | ||
126b9d43 | 921 | if (time_before64(fi->i_time, get_jiffies_64())) { |
bcb4be80 | 922 | r = true; |
60bcc88a | 923 | forget_all_cached_acls(inode); |
bcb4be80 MS |
924 | err = fuse_do_getattr(inode, stat, file); |
925 | } else { | |
926 | r = false; | |
927 | err = 0; | |
928 | if (stat) { | |
929 | generic_fillattr(inode, stat); | |
930 | stat->mode = fi->orig_i_mode; | |
45c72cd7 | 931 | stat->ino = fi->orig_ino; |
bcb4be80 MS |
932 | } |
933 | } | |
934 | ||
935 | if (refreshed != NULL) | |
936 | *refreshed = r; | |
937 | ||
938 | return err; | |
939 | } | |
940 | ||
3b463ae0 | 941 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 942 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
943 | { |
944 | int err = -ENOTDIR; | |
945 | struct inode *parent; | |
946 | struct dentry *dir; | |
947 | struct dentry *entry; | |
948 | ||
949 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
950 | if (!parent) | |
951 | return -ENOENT; | |
952 | ||
5955102c | 953 | inode_lock(parent); |
3b463ae0 JM |
954 | if (!S_ISDIR(parent->i_mode)) |
955 | goto unlock; | |
956 | ||
957 | err = -ENOENT; | |
958 | dir = d_find_alias(parent); | |
959 | if (!dir) | |
960 | goto unlock; | |
961 | ||
8387ff25 | 962 | name->hash = full_name_hash(dir, name->name, name->len); |
3b463ae0 JM |
963 | entry = d_lookup(dir, name); |
964 | dput(dir); | |
965 | if (!entry) | |
966 | goto unlock; | |
967 | ||
968 | fuse_invalidate_attr(parent); | |
969 | fuse_invalidate_entry(entry); | |
451d0f59 | 970 | |
2b0143b5 | 971 | if (child_nodeid != 0 && d_really_is_positive(entry)) { |
5955102c | 972 | inode_lock(d_inode(entry)); |
2b0143b5 | 973 | if (get_node_id(d_inode(entry)) != child_nodeid) { |
451d0f59 JM |
974 | err = -ENOENT; |
975 | goto badentry; | |
976 | } | |
977 | if (d_mountpoint(entry)) { | |
978 | err = -EBUSY; | |
979 | goto badentry; | |
980 | } | |
e36cb0b8 | 981 | if (d_is_dir(entry)) { |
451d0f59 JM |
982 | shrink_dcache_parent(entry); |
983 | if (!simple_empty(entry)) { | |
984 | err = -ENOTEMPTY; | |
985 | goto badentry; | |
986 | } | |
2b0143b5 | 987 | d_inode(entry)->i_flags |= S_DEAD; |
451d0f59 JM |
988 | } |
989 | dont_mount(entry); | |
2b0143b5 | 990 | clear_nlink(d_inode(entry)); |
451d0f59 JM |
991 | err = 0; |
992 | badentry: | |
5955102c | 993 | inode_unlock(d_inode(entry)); |
451d0f59 JM |
994 | if (!err) |
995 | d_delete(entry); | |
996 | } else { | |
997 | err = 0; | |
998 | } | |
3b463ae0 | 999 | dput(entry); |
3b463ae0 JM |
1000 | |
1001 | unlock: | |
5955102c | 1002 | inode_unlock(parent); |
3b463ae0 JM |
1003 | iput(parent); |
1004 | return err; | |
1005 | } | |
1006 | ||
87729a55 MS |
1007 | /* |
1008 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1009 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1010 | * means, that the filesystem daemon is able to record the exact |
1011 | * filesystem operations performed, and can also control the behavior | |
1012 | * of the requester process in otherwise impossible ways. For example | |
1013 | * it can delay the operation for arbitrary length of time allowing | |
1014 | * DoS against the requester. | |
1015 | * | |
1016 | * For this reason only those processes can call into the filesystem, | |
1017 | * for which the owner of the mount has ptrace privilege. This | |
1018 | * excludes processes started by other users, suid or sgid processes. | |
1019 | */ | |
c2132c1b | 1020 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1021 | { |
c69e8d9c | 1022 | const struct cred *cred; |
87729a55 | 1023 | |
c69e8d9c | 1024 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
1025 | return 1; |
1026 | ||
c2132c1b | 1027 | cred = current_cred(); |
499dcf20 EB |
1028 | if (uid_eq(cred->euid, fc->user_id) && |
1029 | uid_eq(cred->suid, fc->user_id) && | |
1030 | uid_eq(cred->uid, fc->user_id) && | |
1031 | gid_eq(cred->egid, fc->group_id) && | |
1032 | gid_eq(cred->sgid, fc->group_id) && | |
1033 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1034 | return 1; |
c69e8d9c | 1035 | |
c2132c1b | 1036 | return 0; |
87729a55 MS |
1037 | } |
1038 | ||
31d40d74 MS |
1039 | static int fuse_access(struct inode *inode, int mask) |
1040 | { | |
1041 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 1042 | FUSE_ARGS(args); |
31d40d74 MS |
1043 | struct fuse_access_in inarg; |
1044 | int err; | |
1045 | ||
698fa1d1 MS |
1046 | BUG_ON(mask & MAY_NOT_BLOCK); |
1047 | ||
31d40d74 MS |
1048 | if (fc->no_access) |
1049 | return 0; | |
1050 | ||
31d40d74 | 1051 | memset(&inarg, 0, sizeof(inarg)); |
e6305c43 | 1052 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
7078187a MS |
1053 | args.in.h.opcode = FUSE_ACCESS; |
1054 | args.in.h.nodeid = get_node_id(inode); | |
1055 | args.in.numargs = 1; | |
1056 | args.in.args[0].size = sizeof(inarg); | |
1057 | args.in.args[0].value = &inarg; | |
1058 | err = fuse_simple_request(fc, &args); | |
31d40d74 MS |
1059 | if (err == -ENOSYS) { |
1060 | fc->no_access = 1; | |
1061 | err = 0; | |
1062 | } | |
1063 | return err; | |
1064 | } | |
1065 | ||
10556cb2 | 1066 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1067 | { |
10556cb2 | 1068 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1069 | return -ECHILD; |
1070 | ||
60bcc88a | 1071 | forget_all_cached_acls(inode); |
19690ddb MS |
1072 | return fuse_do_getattr(inode, NULL, NULL); |
1073 | } | |
1074 | ||
6f9f1180 MS |
1075 | /* |
1076 | * Check permission. The two basic access models of FUSE are: | |
1077 | * | |
1078 | * 1) Local access checking ('default_permissions' mount option) based | |
1079 | * on file mode. This is the plain old disk filesystem permission | |
1080 | * modell. | |
1081 | * | |
1082 | * 2) "Remote" access checking, where server is responsible for | |
1083 | * checking permission in each inode operation. An exception to this | |
1084 | * is if ->permission() was invoked from sys_access() in which case an | |
1085 | * access request is sent. Execute permission is still checked | |
1086 | * locally based on file mode. | |
1087 | */ | |
10556cb2 | 1088 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1089 | { |
1090 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1091 | bool refreshed = false; |
1092 | int err = 0; | |
e5e5558e | 1093 | |
c2132c1b | 1094 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1095 | return -EACCES; |
244f6385 MS |
1096 | |
1097 | /* | |
e8e96157 | 1098 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1099 | */ |
e8e96157 MS |
1100 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1101 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
19690ddb MS |
1102 | struct fuse_inode *fi = get_fuse_inode(inode); |
1103 | ||
126b9d43 | 1104 | if (time_before64(fi->i_time, get_jiffies_64())) { |
19690ddb MS |
1105 | refreshed = true; |
1106 | ||
10556cb2 | 1107 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1108 | if (err) |
1109 | return err; | |
1110 | } | |
244f6385 MS |
1111 | } |
1112 | ||
1113 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
2830ba7f | 1114 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1115 | |
1116 | /* If permission is denied, try to refresh file | |
1117 | attributes. This is also needed, because the root | |
1118 | node will at first have no permissions */ | |
244f6385 | 1119 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1120 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1121 | if (!err) |
2830ba7f | 1122 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1123 | } |
1124 | ||
6f9f1180 MS |
1125 | /* Note: the opposite of the above test does not |
1126 | exist. So if permissions are revoked this won't be | |
1127 | noticed immediately, only after the attribute | |
1128 | timeout has expired */ | |
9cfcac81 | 1129 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1130 | err = fuse_access(inode, mask); |
1131 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1132 | if (!(inode->i_mode & S_IXUGO)) { | |
1133 | if (refreshed) | |
1134 | return -EACCES; | |
1135 | ||
10556cb2 | 1136 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1137 | if (!err && !(inode->i_mode & S_IXUGO)) |
1138 | return -EACCES; | |
1139 | } | |
e5e5558e | 1140 | } |
244f6385 | 1141 | return err; |
e5e5558e MS |
1142 | } |
1143 | ||
1144 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1145 | struct dir_context *ctx) |
e5e5558e MS |
1146 | { |
1147 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1148 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1149 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
e5e5558e MS |
1150 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
1151 | return -EIO; | |
1152 | if (reclen > nbytes) | |
1153 | break; | |
efeb9e60 MS |
1154 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1155 | return -EIO; | |
e5e5558e | 1156 | |
8d3af7f3 AV |
1157 | if (!dir_emit(ctx, dirent->name, dirent->namelen, |
1158 | dirent->ino, dirent->type)) | |
e5e5558e MS |
1159 | break; |
1160 | ||
1161 | buf += reclen; | |
1162 | nbytes -= reclen; | |
8d3af7f3 | 1163 | ctx->pos = dirent->off; |
e5e5558e MS |
1164 | } |
1165 | ||
1166 | return 0; | |
1167 | } | |
1168 | ||
0b05b183 AA |
1169 | static int fuse_direntplus_link(struct file *file, |
1170 | struct fuse_direntplus *direntplus, | |
1171 | u64 attr_version) | |
1172 | { | |
0b05b183 AA |
1173 | struct fuse_entry_out *o = &direntplus->entry_out; |
1174 | struct fuse_dirent *dirent = &direntplus->dirent; | |
1175 | struct dentry *parent = file->f_path.dentry; | |
1176 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); | |
1177 | struct dentry *dentry; | |
1178 | struct dentry *alias; | |
2b0143b5 | 1179 | struct inode *dir = d_inode(parent); |
0b05b183 AA |
1180 | struct fuse_conn *fc; |
1181 | struct inode *inode; | |
d9b3dbdc | 1182 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
0b05b183 AA |
1183 | |
1184 | if (!o->nodeid) { | |
1185 | /* | |
1186 | * Unlike in the case of fuse_lookup, zero nodeid does not mean | |
1187 | * ENOENT. Instead, it only means the userspace filesystem did | |
1188 | * not want to return attributes/handle for this entry. | |
1189 | * | |
1190 | * So do nothing. | |
1191 | */ | |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | if (name.name[0] == '.') { | |
1196 | /* | |
1197 | * We could potentially refresh the attributes of the directory | |
1198 | * and its parent? | |
1199 | */ | |
1200 | if (name.len == 1) | |
1201 | return 0; | |
1202 | if (name.name[1] == '.' && name.len == 2) | |
1203 | return 0; | |
1204 | } | |
a28ef45c MS |
1205 | |
1206 | if (invalid_nodeid(o->nodeid)) | |
1207 | return -EIO; | |
1208 | if (!fuse_valid_type(o->attr.mode)) | |
1209 | return -EIO; | |
1210 | ||
0b05b183 AA |
1211 | fc = get_fuse_conn(dir); |
1212 | ||
8387ff25 | 1213 | name.hash = full_name_hash(parent, name.name, name.len); |
0b05b183 | 1214 | dentry = d_lookup(parent, &name); |
d9b3dbdc AV |
1215 | if (!dentry) { |
1216 | retry: | |
1217 | dentry = d_alloc_parallel(parent, &name, &wq); | |
1218 | if (IS_ERR(dentry)) | |
1219 | return PTR_ERR(dentry); | |
1220 | } | |
1221 | if (!d_in_lookup(dentry)) { | |
1222 | struct fuse_inode *fi; | |
2b0143b5 | 1223 | inode = d_inode(dentry); |
d9b3dbdc AV |
1224 | if (!inode || |
1225 | get_node_id(inode) != o->nodeid || | |
1226 | ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { | |
5542aa2f | 1227 | d_invalidate(dentry); |
d9b3dbdc AV |
1228 | dput(dentry); |
1229 | goto retry; | |
1230 | } | |
1231 | if (is_bad_inode(inode)) { | |
1232 | dput(dentry); | |
1233 | return -EIO; | |
0b05b183 | 1234 | } |
0b05b183 | 1235 | |
d9b3dbdc AV |
1236 | fi = get_fuse_inode(inode); |
1237 | spin_lock(&fc->lock); | |
1238 | fi->nlookup++; | |
1239 | spin_unlock(&fc->lock); | |
0b05b183 | 1240 | |
60bcc88a | 1241 | forget_all_cached_acls(inode); |
d9b3dbdc AV |
1242 | fuse_change_attributes(inode, &o->attr, |
1243 | entry_attr_timeout(o), | |
1244 | attr_version); | |
1245 | /* | |
1246 | * The other branch comes via fuse_iget() | |
1247 | * which bumps nlookup inside | |
1248 | */ | |
1249 | } else { | |
1250 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, | |
1251 | &o->attr, entry_attr_timeout(o), | |
1252 | attr_version); | |
1253 | if (!inode) | |
1254 | inode = ERR_PTR(-ENOMEM); | |
2914941e | 1255 | |
d9b3dbdc AV |
1256 | alias = d_splice_alias(inode, dentry); |
1257 | d_lookup_done(dentry); | |
1258 | if (alias) { | |
1259 | dput(dentry); | |
1260 | dentry = alias; | |
1261 | } | |
1262 | if (IS_ERR(dentry)) | |
1263 | return PTR_ERR(dentry); | |
0b05b183 | 1264 | } |
6314efee MS |
1265 | if (fc->readdirplus_auto) |
1266 | set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state); | |
0b05b183 AA |
1267 | fuse_change_entry_timeout(dentry, o); |
1268 | ||
c7263bcd | 1269 | dput(dentry); |
d9b3dbdc | 1270 | return 0; |
0b05b183 AA |
1271 | } |
1272 | ||
1273 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1274 | struct dir_context *ctx, u64 attr_version) |
0b05b183 AA |
1275 | { |
1276 | struct fuse_direntplus *direntplus; | |
1277 | struct fuse_dirent *dirent; | |
1278 | size_t reclen; | |
1279 | int over = 0; | |
1280 | int ret; | |
1281 | ||
1282 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { | |
1283 | direntplus = (struct fuse_direntplus *) buf; | |
1284 | dirent = &direntplus->dirent; | |
1285 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); | |
1286 | ||
1287 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1288 | return -EIO; | |
1289 | if (reclen > nbytes) | |
1290 | break; | |
efeb9e60 MS |
1291 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1292 | return -EIO; | |
0b05b183 AA |
1293 | |
1294 | if (!over) { | |
1295 | /* We fill entries into dstbuf only as much as | |
1296 | it can hold. But we still continue iterating | |
1297 | over remaining entries to link them. If not, | |
1298 | we need to send a FORGET for each of those | |
1299 | which we did not link. | |
1300 | */ | |
8d3af7f3 AV |
1301 | over = !dir_emit(ctx, dirent->name, dirent->namelen, |
1302 | dirent->ino, dirent->type); | |
1303 | ctx->pos = dirent->off; | |
0b05b183 AA |
1304 | } |
1305 | ||
1306 | buf += reclen; | |
1307 | nbytes -= reclen; | |
1308 | ||
1309 | ret = fuse_direntplus_link(file, direntplus, attr_version); | |
1310 | if (ret) | |
1311 | fuse_force_forget(file, direntplus->entry_out.nodeid); | |
1312 | } | |
1313 | ||
1314 | return 0; | |
1315 | } | |
1316 | ||
8d3af7f3 | 1317 | static int fuse_readdir(struct file *file, struct dir_context *ctx) |
e5e5558e | 1318 | { |
4582a4ab | 1319 | int plus, err; |
04730fef MS |
1320 | size_t nbytes; |
1321 | struct page *page; | |
496ad9aa | 1322 | struct inode *inode = file_inode(file); |
e5e5558e | 1323 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 | 1324 | struct fuse_req *req; |
0b05b183 | 1325 | u64 attr_version = 0; |
248d86e8 MS |
1326 | |
1327 | if (is_bad_inode(inode)) | |
1328 | return -EIO; | |
1329 | ||
b111c8c0 | 1330 | req = fuse_get_req(fc, 1); |
ce1d5a49 MS |
1331 | if (IS_ERR(req)) |
1332 | return PTR_ERR(req); | |
e5e5558e | 1333 | |
04730fef MS |
1334 | page = alloc_page(GFP_KERNEL); |
1335 | if (!page) { | |
1336 | fuse_put_request(fc, req); | |
1337 | return -ENOMEM; | |
1338 | } | |
4582a4ab | 1339 | |
8d3af7f3 | 1340 | plus = fuse_use_readdirplus(inode, ctx); |
f4975c67 | 1341 | req->out.argpages = 1; |
04730fef MS |
1342 | req->num_pages = 1; |
1343 | req->pages[0] = page; | |
85f40aec | 1344 | req->page_descs[0].length = PAGE_SIZE; |
4582a4ab | 1345 | if (plus) { |
0b05b183 | 1346 | attr_version = fuse_get_attr_version(fc); |
8d3af7f3 | 1347 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1348 | FUSE_READDIRPLUS); |
1349 | } else { | |
8d3af7f3 | 1350 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1351 | FUSE_READDIR); |
1352 | } | |
5c672ab3 | 1353 | fuse_lock_inode(inode); |
b93f858a | 1354 | fuse_request_send(fc, req); |
5c672ab3 | 1355 | fuse_unlock_inode(inode); |
361b1eb5 | 1356 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1357 | err = req->out.h.error; |
1358 | fuse_put_request(fc, req); | |
0b05b183 | 1359 | if (!err) { |
4582a4ab | 1360 | if (plus) { |
0b05b183 | 1361 | err = parse_dirplusfile(page_address(page), nbytes, |
8d3af7f3 | 1362 | file, ctx, |
0b05b183 AA |
1363 | attr_version); |
1364 | } else { | |
1365 | err = parse_dirfile(page_address(page), nbytes, file, | |
8d3af7f3 | 1366 | ctx); |
0b05b183 AA |
1367 | } |
1368 | } | |
e5e5558e | 1369 | |
04730fef | 1370 | __free_page(page); |
451418fc | 1371 | fuse_invalidate_atime(inode); |
04730fef | 1372 | return err; |
e5e5558e MS |
1373 | } |
1374 | ||
6b255391 | 1375 | static const char *fuse_get_link(struct dentry *dentry, |
fceef393 AV |
1376 | struct inode *inode, |
1377 | struct delayed_call *done) | |
e5e5558e | 1378 | { |
e5e5558e | 1379 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 1380 | FUSE_ARGS(args); |
e5e5558e | 1381 | char *link; |
7078187a | 1382 | ssize_t ret; |
e5e5558e | 1383 | |
6b255391 AV |
1384 | if (!dentry) |
1385 | return ERR_PTR(-ECHILD); | |
1386 | ||
cd3417c8 | 1387 | link = kmalloc(PAGE_SIZE, GFP_KERNEL); |
7078187a MS |
1388 | if (!link) |
1389 | return ERR_PTR(-ENOMEM); | |
1390 | ||
1391 | args.in.h.opcode = FUSE_READLINK; | |
1392 | args.in.h.nodeid = get_node_id(inode); | |
1393 | args.out.argvar = 1; | |
1394 | args.out.numargs = 1; | |
1395 | args.out.args[0].size = PAGE_SIZE - 1; | |
1396 | args.out.args[0].value = link; | |
1397 | ret = fuse_simple_request(fc, &args); | |
1398 | if (ret < 0) { | |
cd3417c8 | 1399 | kfree(link); |
7078187a MS |
1400 | link = ERR_PTR(ret); |
1401 | } else { | |
1402 | link[ret] = '\0'; | |
fceef393 | 1403 | set_delayed_call(done, kfree_link, link); |
7078187a | 1404 | } |
451418fc | 1405 | fuse_invalidate_atime(inode); |
e5e5558e MS |
1406 | return link; |
1407 | } | |
1408 | ||
e5e5558e MS |
1409 | static int fuse_dir_open(struct inode *inode, struct file *file) |
1410 | { | |
91fe96b4 | 1411 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1412 | } |
1413 | ||
1414 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1415 | { | |
8b0797a4 MS |
1416 | fuse_release_common(file, FUSE_RELEASEDIR); |
1417 | ||
1418 | return 0; | |
e5e5558e MS |
1419 | } |
1420 | ||
02c24a82 JB |
1421 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1422 | int datasync) | |
82547981 | 1423 | { |
02c24a82 | 1424 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1425 | } |
1426 | ||
b18da0c5 MS |
1427 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1428 | unsigned long arg) | |
1429 | { | |
1430 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1431 | ||
1432 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1433 | if (fc->minor < 18) | |
1434 | return -ENOTTY; | |
1435 | ||
1436 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1437 | } | |
1438 | ||
1439 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1440 | unsigned long arg) | |
1441 | { | |
1442 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1443 | ||
1444 | if (fc->minor < 18) | |
1445 | return -ENOTTY; | |
1446 | ||
1447 | return fuse_ioctl_common(file, cmd, arg, | |
1448 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1449 | } | |
1450 | ||
b0aa7606 | 1451 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
17637cba MS |
1452 | { |
1453 | /* Always update if mtime is explicitly set */ | |
1454 | if (ivalid & ATTR_MTIME_SET) | |
1455 | return true; | |
1456 | ||
b0aa7606 MP |
1457 | /* Or if kernel i_mtime is the official one */ |
1458 | if (trust_local_mtime) | |
1459 | return true; | |
1460 | ||
17637cba MS |
1461 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
1462 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1463 | return false; | |
1464 | ||
1465 | /* In all other cases update */ | |
1466 | return true; | |
1467 | } | |
1468 | ||
b0aa7606 | 1469 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg, |
3ad22c62 | 1470 | bool trust_local_cmtime) |
9e6268db MS |
1471 | { |
1472 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1473 | |
1474 | if (ivalid & ATTR_MODE) | |
befc649c | 1475 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1476 | if (ivalid & ATTR_UID) |
499dcf20 | 1477 | arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid); |
9e6268db | 1478 | if (ivalid & ATTR_GID) |
499dcf20 | 1479 | arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid); |
9e6268db | 1480 | if (ivalid & ATTR_SIZE) |
befc649c | 1481 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1482 | if (ivalid & ATTR_ATIME) { |
1483 | arg->valid |= FATTR_ATIME; | |
befc649c | 1484 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1485 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1486 | if (!(ivalid & ATTR_ATIME_SET)) | |
1487 | arg->valid |= FATTR_ATIME_NOW; | |
1488 | } | |
3ad22c62 | 1489 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
17637cba | 1490 | arg->valid |= FATTR_MTIME; |
befc649c | 1491 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba | 1492 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
3ad22c62 | 1493 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
17637cba | 1494 | arg->valid |= FATTR_MTIME_NOW; |
befc649c | 1495 | } |
3ad22c62 MP |
1496 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
1497 | arg->valid |= FATTR_CTIME; | |
1498 | arg->ctime = iattr->ia_ctime.tv_sec; | |
1499 | arg->ctimensec = iattr->ia_ctime.tv_nsec; | |
1500 | } | |
9e6268db MS |
1501 | } |
1502 | ||
3be5a52b MS |
1503 | /* |
1504 | * Prevent concurrent writepages on inode | |
1505 | * | |
1506 | * This is done by adding a negative bias to the inode write counter | |
1507 | * and waiting for all pending writes to finish. | |
1508 | */ | |
1509 | void fuse_set_nowrite(struct inode *inode) | |
1510 | { | |
1511 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1512 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1513 | ||
5955102c | 1514 | BUG_ON(!inode_is_locked(inode)); |
3be5a52b MS |
1515 | |
1516 | spin_lock(&fc->lock); | |
1517 | BUG_ON(fi->writectr < 0); | |
1518 | fi->writectr += FUSE_NOWRITE; | |
1519 | spin_unlock(&fc->lock); | |
1520 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1521 | } | |
1522 | ||
1523 | /* | |
1524 | * Allow writepages on inode | |
1525 | * | |
1526 | * Remove the bias from the writecounter and send any queued | |
1527 | * writepages. | |
1528 | */ | |
1529 | static void __fuse_release_nowrite(struct inode *inode) | |
1530 | { | |
1531 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1532 | ||
1533 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1534 | fi->writectr = 0; | |
1535 | fuse_flush_writepages(inode); | |
1536 | } | |
1537 | ||
1538 | void fuse_release_nowrite(struct inode *inode) | |
1539 | { | |
1540 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1541 | ||
1542 | spin_lock(&fc->lock); | |
1543 | __fuse_release_nowrite(inode); | |
1544 | spin_unlock(&fc->lock); | |
1545 | } | |
1546 | ||
7078187a | 1547 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args, |
b0aa7606 MP |
1548 | struct inode *inode, |
1549 | struct fuse_setattr_in *inarg_p, | |
1550 | struct fuse_attr_out *outarg_p) | |
1551 | { | |
7078187a MS |
1552 | args->in.h.opcode = FUSE_SETATTR; |
1553 | args->in.h.nodeid = get_node_id(inode); | |
1554 | args->in.numargs = 1; | |
1555 | args->in.args[0].size = sizeof(*inarg_p); | |
1556 | args->in.args[0].value = inarg_p; | |
1557 | args->out.numargs = 1; | |
21f62174 | 1558 | args->out.args[0].size = sizeof(*outarg_p); |
7078187a | 1559 | args->out.args[0].value = outarg_p; |
b0aa7606 MP |
1560 | } |
1561 | ||
1562 | /* | |
1563 | * Flush inode->i_mtime to the server | |
1564 | */ | |
ab9e13f7 | 1565 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
b0aa7606 | 1566 | { |
b0aa7606 | 1567 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 1568 | FUSE_ARGS(args); |
b0aa7606 MP |
1569 | struct fuse_setattr_in inarg; |
1570 | struct fuse_attr_out outarg; | |
b0aa7606 MP |
1571 | |
1572 | memset(&inarg, 0, sizeof(inarg)); | |
1573 | memset(&outarg, 0, sizeof(outarg)); | |
1574 | ||
ab9e13f7 | 1575 | inarg.valid = FATTR_MTIME; |
b0aa7606 MP |
1576 | inarg.mtime = inode->i_mtime.tv_sec; |
1577 | inarg.mtimensec = inode->i_mtime.tv_nsec; | |
ab9e13f7 MP |
1578 | if (fc->minor >= 23) { |
1579 | inarg.valid |= FATTR_CTIME; | |
1580 | inarg.ctime = inode->i_ctime.tv_sec; | |
1581 | inarg.ctimensec = inode->i_ctime.tv_nsec; | |
1582 | } | |
1e18bda8 MS |
1583 | if (ff) { |
1584 | inarg.valid |= FATTR_FH; | |
1585 | inarg.fh = ff->fh; | |
1586 | } | |
7078187a | 1587 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
b0aa7606 | 1588 | |
7078187a | 1589 | return fuse_simple_request(fc, &args); |
b0aa7606 MP |
1590 | } |
1591 | ||
6f9f1180 MS |
1592 | /* |
1593 | * Set attributes, and at the same time refresh them. | |
1594 | * | |
1595 | * Truncation is slightly complicated, because the 'truncate' request | |
1596 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1597 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1598 | * and the actual truncation by hand. | |
6f9f1180 | 1599 | */ |
efb9fa9e MP |
1600 | int fuse_do_setattr(struct inode *inode, struct iattr *attr, |
1601 | struct file *file) | |
9e6268db | 1602 | { |
9e6268db | 1603 | struct fuse_conn *fc = get_fuse_conn(inode); |
06a7c3c2 | 1604 | struct fuse_inode *fi = get_fuse_inode(inode); |
7078187a | 1605 | FUSE_ARGS(args); |
9e6268db MS |
1606 | struct fuse_setattr_in inarg; |
1607 | struct fuse_attr_out outarg; | |
3be5a52b | 1608 | bool is_truncate = false; |
8373200b | 1609 | bool is_wb = fc->writeback_cache; |
3be5a52b | 1610 | loff_t oldsize; |
9e6268db | 1611 | int err; |
3ad22c62 | 1612 | bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode); |
9e6268db | 1613 | |
db78b877 CH |
1614 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1615 | attr->ia_valid |= ATTR_FORCE; | |
1616 | ||
1617 | err = inode_change_ok(inode, attr); | |
1618 | if (err) | |
1619 | return err; | |
1e9a4ed9 | 1620 | |
8d56addd MS |
1621 | if (attr->ia_valid & ATTR_OPEN) { |
1622 | if (fc->atomic_o_trunc) | |
1623 | return 0; | |
1624 | file = NULL; | |
1625 | } | |
6ff958ed | 1626 | |
2c27c65e | 1627 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1628 | is_truncate = true; |
9e6268db | 1629 | |
06a7c3c2 | 1630 | if (is_truncate) { |
3be5a52b | 1631 | fuse_set_nowrite(inode); |
06a7c3c2 | 1632 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3ad22c62 MP |
1633 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
1634 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; | |
06a7c3c2 | 1635 | } |
3be5a52b | 1636 | |
9e6268db | 1637 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1638 | memset(&outarg, 0, sizeof(outarg)); |
3ad22c62 | 1639 | iattr_to_fattr(attr, &inarg, trust_local_cmtime); |
49d4914f MS |
1640 | if (file) { |
1641 | struct fuse_file *ff = file->private_data; | |
1642 | inarg.valid |= FATTR_FH; | |
1643 | inarg.fh = ff->fh; | |
1644 | } | |
f3332114 MS |
1645 | if (attr->ia_valid & ATTR_SIZE) { |
1646 | /* For mandatory locking in truncate */ | |
1647 | inarg.valid |= FATTR_LOCKOWNER; | |
1648 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1649 | } | |
7078187a MS |
1650 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
1651 | err = fuse_simple_request(fc, &args); | |
e00d2c2d MS |
1652 | if (err) { |
1653 | if (err == -EINTR) | |
1654 | fuse_invalidate_attr(inode); | |
3be5a52b | 1655 | goto error; |
e00d2c2d | 1656 | } |
9e6268db | 1657 | |
e00d2c2d MS |
1658 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1659 | make_bad_inode(inode); | |
3be5a52b MS |
1660 | err = -EIO; |
1661 | goto error; | |
1662 | } | |
1663 | ||
1664 | spin_lock(&fc->lock); | |
b0aa7606 | 1665 | /* the kernel maintains i_mtime locally */ |
3ad22c62 MP |
1666 | if (trust_local_cmtime) { |
1667 | if (attr->ia_valid & ATTR_MTIME) | |
1668 | inode->i_mtime = attr->ia_mtime; | |
1669 | if (attr->ia_valid & ATTR_CTIME) | |
1670 | inode->i_ctime = attr->ia_ctime; | |
1e18bda8 | 1671 | /* FIXME: clear I_DIRTY_SYNC? */ |
b0aa7606 MP |
1672 | } |
1673 | ||
3be5a52b MS |
1674 | fuse_change_attributes_common(inode, &outarg.attr, |
1675 | attr_timeout(&outarg)); | |
1676 | oldsize = inode->i_size; | |
8373200b PE |
1677 | /* see the comment in fuse_change_attributes() */ |
1678 | if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) | |
1679 | i_size_write(inode, outarg.attr.size); | |
3be5a52b MS |
1680 | |
1681 | if (is_truncate) { | |
1682 | /* NOTE: this may release/reacquire fc->lock */ | |
1683 | __fuse_release_nowrite(inode); | |
1684 | } | |
1685 | spin_unlock(&fc->lock); | |
1686 | ||
1687 | /* | |
1688 | * Only call invalidate_inode_pages2() after removing | |
1689 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1690 | */ | |
8373200b PE |
1691 | if ((is_truncate || !is_wb) && |
1692 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1693 | truncate_pagecache(inode, outarg.attr.size); |
3be5a52b | 1694 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1695 | } |
1696 | ||
06a7c3c2 | 1697 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
e00d2c2d | 1698 | return 0; |
3be5a52b MS |
1699 | |
1700 | error: | |
1701 | if (is_truncate) | |
1702 | fuse_release_nowrite(inode); | |
1703 | ||
06a7c3c2 | 1704 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3be5a52b | 1705 | return err; |
9e6268db MS |
1706 | } |
1707 | ||
49d4914f MS |
1708 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1709 | { | |
2b0143b5 | 1710 | struct inode *inode = d_inode(entry); |
5e940c1d | 1711 | struct fuse_conn *fc = get_fuse_conn(inode); |
a09f99ed | 1712 | struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL; |
5e2b8828 | 1713 | int ret; |
efb9fa9e MP |
1714 | |
1715 | if (!fuse_allow_current_process(get_fuse_conn(inode))) | |
1716 | return -EACCES; | |
1717 | ||
a09f99ed | 1718 | if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) { |
a09f99ed MS |
1719 | attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | |
1720 | ATTR_MODE); | |
5e940c1d | 1721 | |
a09f99ed | 1722 | /* |
5e940c1d MS |
1723 | * The only sane way to reliably kill suid/sgid is to do it in |
1724 | * the userspace filesystem | |
1725 | * | |
1726 | * This should be done on write(), truncate() and chown(). | |
a09f99ed | 1727 | */ |
5e940c1d MS |
1728 | if (!fc->handle_killpriv) { |
1729 | int kill; | |
1730 | ||
1731 | /* | |
1732 | * ia_mode calculation may have used stale i_mode. | |
1733 | * Refresh and recalculate. | |
1734 | */ | |
1735 | ret = fuse_do_getattr(inode, NULL, file); | |
1736 | if (ret) | |
1737 | return ret; | |
1738 | ||
1739 | attr->ia_mode = inode->i_mode; | |
1740 | kill = should_remove_suid(entry); | |
1741 | if (kill & ATTR_KILL_SUID) { | |
1742 | attr->ia_valid |= ATTR_MODE; | |
1743 | attr->ia_mode &= ~S_ISUID; | |
1744 | } | |
1745 | if (kill & ATTR_KILL_SGID) { | |
1746 | attr->ia_valid |= ATTR_MODE; | |
1747 | attr->ia_mode &= ~S_ISGID; | |
1748 | } | |
a09f99ed MS |
1749 | } |
1750 | } | |
1751 | if (!attr->ia_valid) | |
1752 | return 0; | |
5e2b8828 | 1753 | |
a09f99ed | 1754 | ret = fuse_do_setattr(inode, attr, file); |
5e2b8828 | 1755 | if (!ret) { |
60bcc88a SF |
1756 | /* |
1757 | * If filesystem supports acls it may have updated acl xattrs in | |
1758 | * the filesystem, so forget cached acls for the inode. | |
1759 | */ | |
1760 | if (fc->posix_acl) | |
1761 | forget_all_cached_acls(inode); | |
1762 | ||
5e2b8828 MS |
1763 | /* Directory mode changed, may need to revalidate access */ |
1764 | if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE)) | |
1765 | fuse_invalidate_entry_cache(entry); | |
1766 | } | |
1767 | return ret; | |
49d4914f MS |
1768 | } |
1769 | ||
e5e5558e MS |
1770 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1771 | struct kstat *stat) | |
1772 | { | |
2b0143b5 | 1773 | struct inode *inode = d_inode(entry); |
244f6385 | 1774 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1775 | |
c2132c1b | 1776 | if (!fuse_allow_current_process(fc)) |
244f6385 MS |
1777 | return -EACCES; |
1778 | ||
bcb4be80 | 1779 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1780 | } |
1781 | ||
754661f1 | 1782 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1783 | .lookup = fuse_lookup, |
9e6268db MS |
1784 | .mkdir = fuse_mkdir, |
1785 | .symlink = fuse_symlink, | |
1786 | .unlink = fuse_unlink, | |
1787 | .rmdir = fuse_rmdir, | |
1560c974 | 1788 | .rename2 = fuse_rename2, |
9e6268db MS |
1789 | .link = fuse_link, |
1790 | .setattr = fuse_setattr, | |
1791 | .create = fuse_create, | |
c8ccbe03 | 1792 | .atomic_open = fuse_atomic_open, |
9e6268db | 1793 | .mknod = fuse_mknod, |
e5e5558e MS |
1794 | .permission = fuse_permission, |
1795 | .getattr = fuse_getattr, | |
703c7362 SF |
1796 | .setxattr = generic_setxattr, |
1797 | .getxattr = generic_getxattr, | |
92a8780e | 1798 | .listxattr = fuse_listxattr, |
703c7362 | 1799 | .removexattr = generic_removexattr, |
60bcc88a SF |
1800 | .get_acl = fuse_get_acl, |
1801 | .set_acl = fuse_set_acl, | |
e5e5558e MS |
1802 | }; |
1803 | ||
4b6f5d20 | 1804 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1805 | .llseek = generic_file_llseek, |
e5e5558e | 1806 | .read = generic_read_dir, |
d9b3dbdc | 1807 | .iterate_shared = fuse_readdir, |
e5e5558e MS |
1808 | .open = fuse_dir_open, |
1809 | .release = fuse_dir_release, | |
82547981 | 1810 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1811 | .unlocked_ioctl = fuse_dir_ioctl, |
1812 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1813 | }; |
1814 | ||
754661f1 | 1815 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1816 | .setattr = fuse_setattr, |
e5e5558e MS |
1817 | .permission = fuse_permission, |
1818 | .getattr = fuse_getattr, | |
703c7362 SF |
1819 | .setxattr = generic_setxattr, |
1820 | .getxattr = generic_getxattr, | |
92a8780e | 1821 | .listxattr = fuse_listxattr, |
703c7362 | 1822 | .removexattr = generic_removexattr, |
60bcc88a SF |
1823 | .get_acl = fuse_get_acl, |
1824 | .set_acl = fuse_set_acl, | |
e5e5558e MS |
1825 | }; |
1826 | ||
754661f1 | 1827 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1828 | .setattr = fuse_setattr, |
6b255391 | 1829 | .get_link = fuse_get_link, |
e5e5558e MS |
1830 | .readlink = generic_readlink, |
1831 | .getattr = fuse_getattr, | |
703c7362 SF |
1832 | .setxattr = generic_setxattr, |
1833 | .getxattr = generic_getxattr, | |
92a8780e | 1834 | .listxattr = fuse_listxattr, |
703c7362 | 1835 | .removexattr = generic_removexattr, |
e5e5558e MS |
1836 | }; |
1837 | ||
1838 | void fuse_init_common(struct inode *inode) | |
1839 | { | |
1840 | inode->i_op = &fuse_common_inode_operations; | |
1841 | } | |
1842 | ||
1843 | void fuse_init_dir(struct inode *inode) | |
1844 | { | |
1845 | inode->i_op = &fuse_dir_inode_operations; | |
1846 | inode->i_fop = &fuse_dir_operations; | |
1847 | } | |
1848 | ||
1849 | void fuse_init_symlink(struct inode *inode) | |
1850 | { | |
1851 | inode->i_op = &fuse_symlink_inode_operations; | |
1852 | } |