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 | ||
6f9f1180 MS |
115 | /* |
116 | * Just mark the entry as stale, so that a next attempt to look it up | |
117 | * will result in a new lookup call to userspace | |
118 | * | |
119 | * This is called when a dentry is about to become negative and the | |
120 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
121 | * lookup) | |
122 | */ | |
dbd561d2 | 123 | void fuse_invalidate_entry_cache(struct dentry *entry) |
8cbdf1e6 | 124 | { |
0a0898cf | 125 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
126 | } |
127 | ||
6f9f1180 MS |
128 | /* |
129 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
130 | * dentry from the hash | |
131 | */ | |
8cbdf1e6 MS |
132 | static void fuse_invalidate_entry(struct dentry *entry) |
133 | { | |
134 | d_invalidate(entry); | |
135 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
136 | } |
137 | ||
c180eebe MS |
138 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_req *req, |
139 | u64 nodeid, struct qstr *name, | |
e5e5558e MS |
140 | struct fuse_entry_out *outarg) |
141 | { | |
0e9663ee | 142 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
e5e5558e | 143 | req->in.h.opcode = FUSE_LOOKUP; |
c180eebe | 144 | req->in.h.nodeid = nodeid; |
e5e5558e | 145 | req->in.numargs = 1; |
c180eebe MS |
146 | req->in.args[0].size = name->len + 1; |
147 | req->in.args[0].value = name->name; | |
e5e5558e | 148 | req->out.numargs = 1; |
0e9663ee MS |
149 | if (fc->minor < 9) |
150 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
151 | else | |
152 | req->out.args[0].size = sizeof(struct fuse_entry_out); | |
e5e5558e MS |
153 | req->out.args[0].value = outarg; |
154 | } | |
155 | ||
5c5c5e51 | 156 | u64 fuse_get_attr_version(struct fuse_conn *fc) |
7dca9fd3 MS |
157 | { |
158 | u64 curr_version; | |
159 | ||
160 | /* | |
161 | * The spin lock isn't actually needed on 64bit archs, but we | |
162 | * don't yet care too much about such optimizations. | |
163 | */ | |
164 | spin_lock(&fc->lock); | |
165 | curr_version = fc->attr_version; | |
166 | spin_unlock(&fc->lock); | |
167 | ||
168 | return curr_version; | |
169 | } | |
170 | ||
6f9f1180 MS |
171 | /* |
172 | * Check whether the dentry is still valid | |
173 | * | |
174 | * If the entry validity timeout has expired and the dentry is | |
175 | * positive, try to redo the lookup. If the lookup results in a | |
176 | * different inode, then let the VFS invalidate the dentry and redo | |
177 | * the lookup once more. If the lookup results in the same inode, | |
178 | * then refresh the attributes, timeouts and mark the dentry valid. | |
179 | */ | |
0b728e19 | 180 | static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) |
e5e5558e | 181 | { |
34286d66 | 182 | struct inode *inode; |
28420dad MS |
183 | struct dentry *parent; |
184 | struct fuse_conn *fc; | |
6314efee | 185 | struct fuse_inode *fi; |
e2a6b952 | 186 | int ret; |
8cbdf1e6 | 187 | |
e7c0a167 | 188 | inode = ACCESS_ONCE(entry->d_inode); |
8cbdf1e6 | 189 | if (inode && is_bad_inode(inode)) |
e2a6b952 | 190 | goto invalid; |
0a0898cf | 191 | else if (fuse_dentry_time(entry) < get_jiffies_64()) { |
e5e5558e | 192 | int err; |
e5e5558e | 193 | struct fuse_entry_out outarg; |
8cbdf1e6 | 194 | struct fuse_req *req; |
07e77dca | 195 | struct fuse_forget_link *forget; |
1fb69e78 | 196 | u64 attr_version; |
8cbdf1e6 | 197 | |
50322fe7 | 198 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 | 199 | if (!inode) |
e2a6b952 | 200 | goto invalid; |
8cbdf1e6 | 201 | |
e2a6b952 | 202 | ret = -ECHILD; |
0b728e19 | 203 | if (flags & LOOKUP_RCU) |
e2a6b952 | 204 | goto out; |
e7c0a167 | 205 | |
8cbdf1e6 | 206 | fc = get_fuse_conn(inode); |
b111c8c0 | 207 | req = fuse_get_req_nopages(fc); |
e2a6b952 | 208 | ret = PTR_ERR(req); |
ce1d5a49 | 209 | if (IS_ERR(req)) |
e2a6b952 | 210 | goto out; |
e5e5558e | 211 | |
07e77dca MS |
212 | forget = fuse_alloc_forget(); |
213 | if (!forget) { | |
2d51013e | 214 | fuse_put_request(fc, req); |
e2a6b952 MS |
215 | ret = -ENOMEM; |
216 | goto out; | |
2d51013e MS |
217 | } |
218 | ||
7dca9fd3 | 219 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 220 | |
e956edd0 | 221 | parent = dget_parent(entry); |
c180eebe MS |
222 | fuse_lookup_init(fc, req, get_node_id(parent->d_inode), |
223 | &entry->d_name, &outarg); | |
b93f858a | 224 | fuse_request_send(fc, req); |
e956edd0 | 225 | dput(parent); |
e5e5558e | 226 | err = req->out.h.error; |
2d51013e | 227 | fuse_put_request(fc, req); |
50322fe7 MS |
228 | /* Zero nodeid is same as -ENOENT */ |
229 | if (!err && !outarg.nodeid) | |
230 | err = -ENOENT; | |
9e6268db | 231 | if (!err) { |
6314efee | 232 | fi = get_fuse_inode(inode); |
9e6268db | 233 | if (outarg.nodeid != get_node_id(inode)) { |
07e77dca | 234 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
e2a6b952 | 235 | goto invalid; |
9e6268db | 236 | } |
8da5ff23 | 237 | spin_lock(&fc->lock); |
1729a16c | 238 | fi->nlookup++; |
8da5ff23 | 239 | spin_unlock(&fc->lock); |
9e6268db | 240 | } |
07e77dca | 241 | kfree(forget); |
9e6268db | 242 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e2a6b952 | 243 | goto invalid; |
e5e5558e | 244 | |
1fb69e78 MS |
245 | fuse_change_attributes(inode, &outarg.attr, |
246 | entry_attr_timeout(&outarg), | |
247 | attr_version); | |
248 | fuse_change_entry_timeout(entry, &outarg); | |
28420dad | 249 | } else if (inode) { |
6314efee MS |
250 | fi = get_fuse_inode(inode); |
251 | if (flags & LOOKUP_RCU) { | |
252 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) | |
253 | return -ECHILD; | |
254 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { | |
28420dad MS |
255 | parent = dget_parent(entry); |
256 | fuse_advise_use_readdirplus(parent->d_inode); | |
257 | dput(parent); | |
258 | } | |
e5e5558e | 259 | } |
e2a6b952 MS |
260 | ret = 1; |
261 | out: | |
262 | return ret; | |
263 | ||
264 | invalid: | |
265 | ret = 0; | |
3c70b8ee MS |
266 | |
267 | if (!(flags & LOOKUP_RCU) && check_submounts_and_drop(entry) != 0) | |
46ea1562 | 268 | ret = 1; |
e2a6b952 | 269 | goto out; |
e5e5558e MS |
270 | } |
271 | ||
8bfc016d | 272 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
273 | { |
274 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
275 | } | |
276 | ||
4269590a | 277 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e MS |
278 | .d_revalidate = fuse_dentry_revalidate, |
279 | }; | |
280 | ||
a5bfffac | 281 | int fuse_valid_type(int m) |
39ee059a MS |
282 | { |
283 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
284 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
285 | } | |
286 | ||
c180eebe MS |
287 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, |
288 | struct fuse_entry_out *outarg, struct inode **inode) | |
e5e5558e | 289 | { |
c180eebe | 290 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
e5e5558e | 291 | struct fuse_req *req; |
07e77dca | 292 | struct fuse_forget_link *forget; |
1fb69e78 | 293 | u64 attr_version; |
c180eebe | 294 | int err; |
e5e5558e | 295 | |
c180eebe MS |
296 | *inode = NULL; |
297 | err = -ENAMETOOLONG; | |
298 | if (name->len > FUSE_NAME_MAX) | |
299 | goto out; | |
e5e5558e | 300 | |
b111c8c0 | 301 | req = fuse_get_req_nopages(fc); |
c180eebe | 302 | err = PTR_ERR(req); |
ce1d5a49 | 303 | if (IS_ERR(req)) |
c180eebe | 304 | goto out; |
e5e5558e | 305 | |
07e77dca MS |
306 | forget = fuse_alloc_forget(); |
307 | err = -ENOMEM; | |
308 | if (!forget) { | |
2d51013e | 309 | fuse_put_request(fc, req); |
c180eebe | 310 | goto out; |
2d51013e MS |
311 | } |
312 | ||
7dca9fd3 | 313 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 314 | |
c180eebe | 315 | fuse_lookup_init(fc, req, nodeid, name, outarg); |
b93f858a | 316 | fuse_request_send(fc, req); |
e5e5558e | 317 | err = req->out.h.error; |
2d51013e | 318 | fuse_put_request(fc, req); |
50322fe7 | 319 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
320 | if (err || !outarg->nodeid) |
321 | goto out_put_forget; | |
322 | ||
323 | err = -EIO; | |
324 | if (!outarg->nodeid) | |
325 | goto out_put_forget; | |
326 | if (!fuse_valid_type(outarg->attr.mode)) | |
327 | goto out_put_forget; | |
328 | ||
329 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
330 | &outarg->attr, entry_attr_timeout(outarg), | |
331 | attr_version); | |
332 | err = -ENOMEM; | |
333 | if (!*inode) { | |
07e77dca | 334 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
c180eebe | 335 | goto out; |
e5e5558e | 336 | } |
c180eebe MS |
337 | err = 0; |
338 | ||
339 | out_put_forget: | |
07e77dca | 340 | kfree(forget); |
c180eebe MS |
341 | out: |
342 | return err; | |
343 | } | |
344 | ||
5835f339 MS |
345 | static struct dentry *fuse_materialise_dentry(struct dentry *dentry, |
346 | struct inode *inode) | |
347 | { | |
348 | struct dentry *newent; | |
349 | ||
350 | if (inode && S_ISDIR(inode->i_mode)) { | |
351 | struct fuse_conn *fc = get_fuse_conn(inode); | |
352 | ||
353 | mutex_lock(&fc->inst_mutex); | |
354 | newent = d_materialise_unique(dentry, inode); | |
355 | mutex_unlock(&fc->inst_mutex); | |
356 | } else { | |
357 | newent = d_materialise_unique(dentry, inode); | |
358 | } | |
359 | ||
360 | return newent; | |
361 | } | |
362 | ||
c180eebe | 363 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, |
00cd8dd3 | 364 | unsigned int flags) |
c180eebe MS |
365 | { |
366 | int err; | |
367 | struct fuse_entry_out outarg; | |
368 | struct inode *inode; | |
369 | struct dentry *newent; | |
c180eebe MS |
370 | bool outarg_valid = true; |
371 | ||
372 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, | |
373 | &outarg, &inode); | |
374 | if (err == -ENOENT) { | |
375 | outarg_valid = false; | |
376 | err = 0; | |
377 | } | |
378 | if (err) | |
379 | goto out_err; | |
380 | ||
381 | err = -EIO; | |
382 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
383 | goto out_iput; | |
e5e5558e | 384 | |
5835f339 MS |
385 | newent = fuse_materialise_dentry(entry, inode); |
386 | err = PTR_ERR(newent); | |
387 | if (IS_ERR(newent)) | |
388 | goto out_err; | |
d2a85164 | 389 | |
0de6256d | 390 | entry = newent ? newent : entry; |
c180eebe | 391 | if (outarg_valid) |
1fb69e78 | 392 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
393 | else |
394 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 395 | |
4582a4ab | 396 | fuse_advise_use_readdirplus(dir); |
0de6256d | 397 | return newent; |
c180eebe MS |
398 | |
399 | out_iput: | |
400 | iput(inode); | |
401 | out_err: | |
402 | return ERR_PTR(err); | |
e5e5558e MS |
403 | } |
404 | ||
6f9f1180 MS |
405 | /* |
406 | * Atomic create+open operation | |
407 | * | |
408 | * If the filesystem doesn't support this, then fall back to separate | |
409 | * 'mknod' + 'open' requests. | |
410 | */ | |
d9585277 | 411 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 412 | struct file *file, unsigned flags, |
d9585277 | 413 | umode_t mode, int *opened) |
fd72faac MS |
414 | { |
415 | int err; | |
416 | struct inode *inode; | |
417 | struct fuse_conn *fc = get_fuse_conn(dir); | |
418 | struct fuse_req *req; | |
07e77dca | 419 | struct fuse_forget_link *forget; |
e0a43ddc | 420 | struct fuse_create_in inarg; |
fd72faac MS |
421 | struct fuse_open_out outopen; |
422 | struct fuse_entry_out outentry; | |
fd72faac | 423 | struct fuse_file *ff; |
fd72faac | 424 | |
af109bca MS |
425 | /* Userspace expects S_IFREG in create mode */ |
426 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
427 | ||
07e77dca | 428 | forget = fuse_alloc_forget(); |
c8ccbe03 | 429 | err = -ENOMEM; |
07e77dca | 430 | if (!forget) |
c8ccbe03 | 431 | goto out_err; |
51eb01e7 | 432 | |
b111c8c0 | 433 | req = fuse_get_req_nopages(fc); |
51eb01e7 | 434 | err = PTR_ERR(req); |
ce1d5a49 | 435 | if (IS_ERR(req)) |
51eb01e7 | 436 | goto out_put_forget_req; |
fd72faac | 437 | |
ce1d5a49 | 438 | err = -ENOMEM; |
acf99433 | 439 | ff = fuse_file_alloc(fc); |
fd72faac MS |
440 | if (!ff) |
441 | goto out_put_request; | |
442 | ||
e0a43ddc MS |
443 | if (!fc->dont_mask) |
444 | mode &= ~current_umask(); | |
445 | ||
fd72faac MS |
446 | flags &= ~O_NOCTTY; |
447 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 448 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
449 | inarg.flags = flags; |
450 | inarg.mode = mode; | |
e0a43ddc | 451 | inarg.umask = current_umask(); |
fd72faac MS |
452 | req->in.h.opcode = FUSE_CREATE; |
453 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac | 454 | req->in.numargs = 2; |
e0a43ddc MS |
455 | req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : |
456 | sizeof(inarg); | |
fd72faac MS |
457 | req->in.args[0].value = &inarg; |
458 | req->in.args[1].size = entry->d_name.len + 1; | |
459 | req->in.args[1].value = entry->d_name.name; | |
460 | req->out.numargs = 2; | |
0e9663ee MS |
461 | if (fc->minor < 9) |
462 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
463 | else | |
464 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
465 | req->out.args[0].value = &outentry; |
466 | req->out.args[1].size = sizeof(outopen); | |
467 | req->out.args[1].value = &outopen; | |
b93f858a | 468 | fuse_request_send(fc, req); |
fd72faac | 469 | err = req->out.h.error; |
c8ccbe03 | 470 | if (err) |
fd72faac | 471 | goto out_free_ff; |
fd72faac MS |
472 | |
473 | err = -EIO; | |
2827d0b2 | 474 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
475 | goto out_free_ff; |
476 | ||
51eb01e7 | 477 | fuse_put_request(fc, req); |
c7b7143c MS |
478 | ff->fh = outopen.fh; |
479 | ff->nodeid = outentry.nodeid; | |
480 | ff->open_flags = outopen.open_flags; | |
fd72faac | 481 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 482 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
483 | if (!inode) { |
484 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 485 | fuse_sync_release(ff, flags); |
07e77dca | 486 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
487 | err = -ENOMEM; |
488 | goto out_err; | |
fd72faac | 489 | } |
07e77dca | 490 | kfree(forget); |
fd72faac | 491 | d_instantiate(entry, inode); |
1fb69e78 | 492 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 493 | fuse_invalidate_attr(dir); |
30d90494 AV |
494 | err = finish_open(file, entry, generic_file_open, opened); |
495 | if (err) { | |
8b0797a4 | 496 | fuse_sync_release(ff, flags); |
c8ccbe03 MS |
497 | } else { |
498 | file->private_data = fuse_file_get(ff); | |
499 | fuse_finish_open(inode, file); | |
fd72faac | 500 | } |
d9585277 | 501 | return err; |
fd72faac | 502 | |
c8ccbe03 | 503 | out_free_ff: |
fd72faac | 504 | fuse_file_free(ff); |
c8ccbe03 | 505 | out_put_request: |
fd72faac | 506 | fuse_put_request(fc, req); |
c8ccbe03 | 507 | out_put_forget_req: |
07e77dca | 508 | kfree(forget); |
c8ccbe03 | 509 | out_err: |
d9585277 | 510 | return err; |
c8ccbe03 MS |
511 | } |
512 | ||
513 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 514 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 515 | struct file *file, unsigned flags, |
d9585277 | 516 | umode_t mode, int *opened) |
c8ccbe03 MS |
517 | { |
518 | int err; | |
519 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
520 | struct dentry *res = NULL; |
521 | ||
522 | if (d_unhashed(entry)) { | |
00cd8dd3 | 523 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 524 | if (IS_ERR(res)) |
d9585277 | 525 | return PTR_ERR(res); |
c8ccbe03 MS |
526 | |
527 | if (res) | |
528 | entry = res; | |
529 | } | |
530 | ||
531 | if (!(flags & O_CREAT) || entry->d_inode) | |
532 | goto no_open; | |
533 | ||
534 | /* Only creates */ | |
47237687 | 535 | *opened |= FILE_CREATED; |
c8ccbe03 MS |
536 | |
537 | if (fc->no_create) | |
538 | goto mknod; | |
539 | ||
30d90494 | 540 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
d9585277 | 541 | if (err == -ENOSYS) { |
c8ccbe03 MS |
542 | fc->no_create = 1; |
543 | goto mknod; | |
544 | } | |
545 | out_dput: | |
546 | dput(res); | |
d9585277 | 547 | return err; |
c8ccbe03 MS |
548 | |
549 | mknod: | |
550 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 551 | if (err) |
c8ccbe03 | 552 | goto out_dput; |
c8ccbe03 | 553 | no_open: |
e45198a6 | 554 | return finish_no_open(file, res); |
fd72faac MS |
555 | } |
556 | ||
6f9f1180 MS |
557 | /* |
558 | * Code shared between mknod, mkdir, symlink and link | |
559 | */ | |
9e6268db MS |
560 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
561 | struct inode *dir, struct dentry *entry, | |
541af6a0 | 562 | umode_t mode) |
9e6268db MS |
563 | { |
564 | struct fuse_entry_out outarg; | |
565 | struct inode *inode; | |
9e6268db | 566 | int err; |
07e77dca | 567 | struct fuse_forget_link *forget; |
2d51013e | 568 | |
07e77dca MS |
569 | forget = fuse_alloc_forget(); |
570 | if (!forget) { | |
2d51013e | 571 | fuse_put_request(fc, req); |
07e77dca | 572 | return -ENOMEM; |
2d51013e | 573 | } |
9e6268db | 574 | |
0e9663ee | 575 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 576 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 577 | req->out.numargs = 1; |
0e9663ee MS |
578 | if (fc->minor < 9) |
579 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
580 | else | |
581 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 582 | req->out.args[0].value = &outarg; |
b93f858a | 583 | fuse_request_send(fc, req); |
9e6268db | 584 | err = req->out.h.error; |
2d51013e MS |
585 | fuse_put_request(fc, req); |
586 | if (err) | |
587 | goto out_put_forget_req; | |
588 | ||
39ee059a MS |
589 | err = -EIO; |
590 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 591 | goto out_put_forget_req; |
39ee059a MS |
592 | |
593 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 594 | goto out_put_forget_req; |
39ee059a | 595 | |
9e6268db | 596 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 597 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 598 | if (!inode) { |
07e77dca | 599 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
600 | return -ENOMEM; |
601 | } | |
07e77dca | 602 | kfree(forget); |
9e6268db | 603 | |
d2a85164 MS |
604 | if (S_ISDIR(inode->i_mode)) { |
605 | struct dentry *alias; | |
606 | mutex_lock(&fc->inst_mutex); | |
607 | alias = d_find_alias(inode); | |
608 | if (alias) { | |
609 | /* New directory must have moved since mkdir */ | |
610 | mutex_unlock(&fc->inst_mutex); | |
611 | dput(alias); | |
612 | iput(inode); | |
613 | return -EBUSY; | |
614 | } | |
615 | d_instantiate(entry, inode); | |
616 | mutex_unlock(&fc->inst_mutex); | |
617 | } else | |
618 | d_instantiate(entry, inode); | |
9e6268db | 619 | |
1fb69e78 | 620 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
621 | fuse_invalidate_attr(dir); |
622 | return 0; | |
39ee059a | 623 | |
2d51013e | 624 | out_put_forget_req: |
07e77dca | 625 | kfree(forget); |
39ee059a | 626 | return err; |
9e6268db MS |
627 | } |
628 | ||
1a67aafb | 629 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
630 | dev_t rdev) |
631 | { | |
632 | struct fuse_mknod_in inarg; | |
633 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 634 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
635 | if (IS_ERR(req)) |
636 | return PTR_ERR(req); | |
9e6268db | 637 | |
e0a43ddc MS |
638 | if (!fc->dont_mask) |
639 | mode &= ~current_umask(); | |
640 | ||
9e6268db MS |
641 | memset(&inarg, 0, sizeof(inarg)); |
642 | inarg.mode = mode; | |
643 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 644 | inarg.umask = current_umask(); |
9e6268db MS |
645 | req->in.h.opcode = FUSE_MKNOD; |
646 | req->in.numargs = 2; | |
e0a43ddc MS |
647 | req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : |
648 | sizeof(inarg); | |
9e6268db MS |
649 | req->in.args[0].value = &inarg; |
650 | req->in.args[1].size = entry->d_name.len + 1; | |
651 | req->in.args[1].value = entry->d_name.name; | |
652 | return create_new_entry(fc, req, dir, entry, mode); | |
653 | } | |
654 | ||
4acdaf27 | 655 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
ebfc3b49 | 656 | bool excl) |
9e6268db MS |
657 | { |
658 | return fuse_mknod(dir, entry, mode, 0); | |
659 | } | |
660 | ||
18bb1db3 | 661 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
662 | { |
663 | struct fuse_mkdir_in inarg; | |
664 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 665 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
666 | if (IS_ERR(req)) |
667 | return PTR_ERR(req); | |
9e6268db | 668 | |
e0a43ddc MS |
669 | if (!fc->dont_mask) |
670 | mode &= ~current_umask(); | |
671 | ||
9e6268db MS |
672 | memset(&inarg, 0, sizeof(inarg)); |
673 | inarg.mode = mode; | |
e0a43ddc | 674 | inarg.umask = current_umask(); |
9e6268db MS |
675 | req->in.h.opcode = FUSE_MKDIR; |
676 | req->in.numargs = 2; | |
677 | req->in.args[0].size = sizeof(inarg); | |
678 | req->in.args[0].value = &inarg; | |
679 | req->in.args[1].size = entry->d_name.len + 1; | |
680 | req->in.args[1].value = entry->d_name.name; | |
681 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
682 | } | |
683 | ||
684 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
685 | const char *link) | |
686 | { | |
687 | struct fuse_conn *fc = get_fuse_conn(dir); | |
688 | unsigned len = strlen(link) + 1; | |
b111c8c0 | 689 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
690 | if (IS_ERR(req)) |
691 | return PTR_ERR(req); | |
9e6268db MS |
692 | |
693 | req->in.h.opcode = FUSE_SYMLINK; | |
694 | req->in.numargs = 2; | |
695 | req->in.args[0].size = entry->d_name.len + 1; | |
696 | req->in.args[0].value = entry->d_name.name; | |
697 | req->in.args[1].size = len; | |
698 | req->in.args[1].value = link; | |
699 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
700 | } | |
701 | ||
702 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
703 | { | |
704 | int err; | |
705 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 706 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
707 | if (IS_ERR(req)) |
708 | return PTR_ERR(req); | |
9e6268db MS |
709 | |
710 | req->in.h.opcode = FUSE_UNLINK; | |
711 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
712 | req->in.numargs = 1; |
713 | req->in.args[0].size = entry->d_name.len + 1; | |
714 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 715 | fuse_request_send(fc, req); |
9e6268db MS |
716 | err = req->out.h.error; |
717 | fuse_put_request(fc, req); | |
718 | if (!err) { | |
719 | struct inode *inode = entry->d_inode; | |
ac45d613 | 720 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 721 | |
ac45d613 MS |
722 | spin_lock(&fc->lock); |
723 | fi->attr_version = ++fc->attr_version; | |
dfca7ceb MS |
724 | /* |
725 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
726 | * happen if userspace filesystem is careless. It would be | |
727 | * difficult to enforce correct nlink usage so just ignore this | |
728 | * condition here | |
729 | */ | |
730 | if (inode->i_nlink > 0) | |
731 | drop_nlink(inode); | |
ac45d613 | 732 | spin_unlock(&fc->lock); |
9e6268db MS |
733 | fuse_invalidate_attr(inode); |
734 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 735 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
736 | } else if (err == -EINTR) |
737 | fuse_invalidate_entry(entry); | |
738 | return err; | |
739 | } | |
740 | ||
741 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
742 | { | |
743 | int err; | |
744 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 745 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
746 | if (IS_ERR(req)) |
747 | return PTR_ERR(req); | |
9e6268db MS |
748 | |
749 | req->in.h.opcode = FUSE_RMDIR; | |
750 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
751 | req->in.numargs = 1; |
752 | req->in.args[0].size = entry->d_name.len + 1; | |
753 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 754 | fuse_request_send(fc, req); |
9e6268db MS |
755 | err = req->out.h.error; |
756 | fuse_put_request(fc, req); | |
757 | if (!err) { | |
ce71ec36 | 758 | clear_nlink(entry->d_inode); |
9e6268db | 759 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 760 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
761 | } else if (err == -EINTR) |
762 | fuse_invalidate_entry(entry); | |
763 | return err; | |
764 | } | |
765 | ||
766 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
767 | struct inode *newdir, struct dentry *newent) | |
768 | { | |
769 | int err; | |
770 | struct fuse_rename_in inarg; | |
771 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
b111c8c0 | 772 | struct fuse_req *req = fuse_get_req_nopages(fc); |
e4eaac06 | 773 | |
ce1d5a49 MS |
774 | if (IS_ERR(req)) |
775 | return PTR_ERR(req); | |
9e6268db MS |
776 | |
777 | memset(&inarg, 0, sizeof(inarg)); | |
778 | inarg.newdir = get_node_id(newdir); | |
779 | req->in.h.opcode = FUSE_RENAME; | |
780 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
781 | req->in.numargs = 3; |
782 | req->in.args[0].size = sizeof(inarg); | |
783 | req->in.args[0].value = &inarg; | |
784 | req->in.args[1].size = oldent->d_name.len + 1; | |
785 | req->in.args[1].value = oldent->d_name.name; | |
786 | req->in.args[2].size = newent->d_name.len + 1; | |
787 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 788 | fuse_request_send(fc, req); |
9e6268db MS |
789 | err = req->out.h.error; |
790 | fuse_put_request(fc, req); | |
791 | if (!err) { | |
08b63307 MS |
792 | /* ctime changes */ |
793 | fuse_invalidate_attr(oldent->d_inode); | |
794 | ||
9e6268db MS |
795 | fuse_invalidate_attr(olddir); |
796 | if (olddir != newdir) | |
797 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
798 | |
799 | /* newent will end up negative */ | |
5219f346 MS |
800 | if (newent->d_inode) { |
801 | fuse_invalidate_attr(newent->d_inode); | |
8cbdf1e6 | 802 | fuse_invalidate_entry_cache(newent); |
5219f346 | 803 | } |
9e6268db MS |
804 | } else if (err == -EINTR) { |
805 | /* If request was interrupted, DEITY only knows if the | |
806 | rename actually took place. If the invalidation | |
807 | fails (e.g. some process has CWD under the renamed | |
808 | directory), then there can be inconsistency between | |
809 | the dcache and the real filesystem. Tough luck. */ | |
810 | fuse_invalidate_entry(oldent); | |
811 | if (newent->d_inode) | |
812 | fuse_invalidate_entry(newent); | |
813 | } | |
814 | ||
815 | return err; | |
816 | } | |
817 | ||
818 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
819 | struct dentry *newent) | |
820 | { | |
821 | int err; | |
822 | struct fuse_link_in inarg; | |
823 | struct inode *inode = entry->d_inode; | |
824 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 825 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
826 | if (IS_ERR(req)) |
827 | return PTR_ERR(req); | |
9e6268db MS |
828 | |
829 | memset(&inarg, 0, sizeof(inarg)); | |
830 | inarg.oldnodeid = get_node_id(inode); | |
831 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
832 | req->in.numargs = 2; |
833 | req->in.args[0].size = sizeof(inarg); | |
834 | req->in.args[0].value = &inarg; | |
835 | req->in.args[1].size = newent->d_name.len + 1; | |
836 | req->in.args[1].value = newent->d_name.name; | |
837 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
838 | /* Contrary to "normal" filesystems it can happen that link | |
839 | makes two "logical" inodes point to the same "physical" | |
840 | inode. We invalidate the attributes of the old one, so it | |
841 | will reflect changes in the backing inode (link count, | |
842 | etc.) | |
843 | */ | |
ac45d613 MS |
844 | if (!err) { |
845 | struct fuse_inode *fi = get_fuse_inode(inode); | |
846 | ||
847 | spin_lock(&fc->lock); | |
848 | fi->attr_version = ++fc->attr_version; | |
849 | inc_nlink(inode); | |
850 | spin_unlock(&fc->lock); | |
9e6268db | 851 | fuse_invalidate_attr(inode); |
ac45d613 MS |
852 | } else if (err == -EINTR) { |
853 | fuse_invalidate_attr(inode); | |
854 | } | |
9e6268db MS |
855 | return err; |
856 | } | |
857 | ||
1fb69e78 MS |
858 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
859 | struct kstat *stat) | |
860 | { | |
203627bb MS |
861 | unsigned int blkbits; |
862 | ||
1fb69e78 MS |
863 | stat->dev = inode->i_sb->s_dev; |
864 | stat->ino = attr->ino; | |
865 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
866 | stat->nlink = attr->nlink; | |
499dcf20 EB |
867 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
868 | stat->gid = make_kgid(&init_user_ns, attr->gid); | |
1fb69e78 MS |
869 | stat->rdev = inode->i_rdev; |
870 | stat->atime.tv_sec = attr->atime; | |
871 | stat->atime.tv_nsec = attr->atimensec; | |
872 | stat->mtime.tv_sec = attr->mtime; | |
873 | stat->mtime.tv_nsec = attr->mtimensec; | |
874 | stat->ctime.tv_sec = attr->ctime; | |
875 | stat->ctime.tv_nsec = attr->ctimensec; | |
876 | stat->size = attr->size; | |
877 | stat->blocks = attr->blocks; | |
203627bb MS |
878 | |
879 | if (attr->blksize != 0) | |
880 | blkbits = ilog2(attr->blksize); | |
881 | else | |
882 | blkbits = inode->i_sb->s_blocksize_bits; | |
883 | ||
884 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
885 | } |
886 | ||
c79e322f MS |
887 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
888 | struct file *file) | |
e5e5558e MS |
889 | { |
890 | int err; | |
c79e322f MS |
891 | struct fuse_getattr_in inarg; |
892 | struct fuse_attr_out outarg; | |
e5e5558e | 893 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
894 | struct fuse_req *req; |
895 | u64 attr_version; | |
896 | ||
b111c8c0 | 897 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
898 | if (IS_ERR(req)) |
899 | return PTR_ERR(req); | |
e5e5558e | 900 | |
7dca9fd3 | 901 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 902 | |
c79e322f | 903 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 904 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
905 | /* Directories have separate file-handle space */ |
906 | if (file && S_ISREG(inode->i_mode)) { | |
907 | struct fuse_file *ff = file->private_data; | |
908 | ||
909 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
910 | inarg.fh = ff->fh; | |
911 | } | |
e5e5558e MS |
912 | req->in.h.opcode = FUSE_GETATTR; |
913 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
914 | req->in.numargs = 1; |
915 | req->in.args[0].size = sizeof(inarg); | |
916 | req->in.args[0].value = &inarg; | |
e5e5558e | 917 | req->out.numargs = 1; |
0e9663ee MS |
918 | if (fc->minor < 9) |
919 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
920 | else | |
921 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 922 | req->out.args[0].value = &outarg; |
b93f858a | 923 | fuse_request_send(fc, req); |
e5e5558e MS |
924 | err = req->out.h.error; |
925 | fuse_put_request(fc, req); | |
926 | if (!err) { | |
c79e322f | 927 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
928 | make_bad_inode(inode); |
929 | err = -EIO; | |
930 | } else { | |
c79e322f MS |
931 | fuse_change_attributes(inode, &outarg.attr, |
932 | attr_timeout(&outarg), | |
1fb69e78 MS |
933 | attr_version); |
934 | if (stat) | |
c79e322f | 935 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
936 | } |
937 | } | |
938 | return err; | |
939 | } | |
940 | ||
bcb4be80 MS |
941 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
942 | struct file *file, bool *refreshed) | |
943 | { | |
944 | struct fuse_inode *fi = get_fuse_inode(inode); | |
945 | int err; | |
946 | bool r; | |
947 | ||
948 | if (fi->i_time < get_jiffies_64()) { | |
949 | r = true; | |
950 | err = fuse_do_getattr(inode, stat, file); | |
951 | } else { | |
952 | r = false; | |
953 | err = 0; | |
954 | if (stat) { | |
955 | generic_fillattr(inode, stat); | |
956 | stat->mode = fi->orig_i_mode; | |
45c72cd7 | 957 | stat->ino = fi->orig_ino; |
bcb4be80 MS |
958 | } |
959 | } | |
960 | ||
961 | if (refreshed != NULL) | |
962 | *refreshed = r; | |
963 | ||
964 | return err; | |
965 | } | |
966 | ||
3b463ae0 | 967 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 968 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
969 | { |
970 | int err = -ENOTDIR; | |
971 | struct inode *parent; | |
972 | struct dentry *dir; | |
973 | struct dentry *entry; | |
974 | ||
975 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
976 | if (!parent) | |
977 | return -ENOENT; | |
978 | ||
979 | mutex_lock(&parent->i_mutex); | |
980 | if (!S_ISDIR(parent->i_mode)) | |
981 | goto unlock; | |
982 | ||
983 | err = -ENOENT; | |
984 | dir = d_find_alias(parent); | |
985 | if (!dir) | |
986 | goto unlock; | |
987 | ||
988 | entry = d_lookup(dir, name); | |
989 | dput(dir); | |
990 | if (!entry) | |
991 | goto unlock; | |
992 | ||
993 | fuse_invalidate_attr(parent); | |
994 | fuse_invalidate_entry(entry); | |
451d0f59 JM |
995 | |
996 | if (child_nodeid != 0 && entry->d_inode) { | |
997 | mutex_lock(&entry->d_inode->i_mutex); | |
998 | if (get_node_id(entry->d_inode) != child_nodeid) { | |
999 | err = -ENOENT; | |
1000 | goto badentry; | |
1001 | } | |
1002 | if (d_mountpoint(entry)) { | |
1003 | err = -EBUSY; | |
1004 | goto badentry; | |
1005 | } | |
1006 | if (S_ISDIR(entry->d_inode->i_mode)) { | |
1007 | shrink_dcache_parent(entry); | |
1008 | if (!simple_empty(entry)) { | |
1009 | err = -ENOTEMPTY; | |
1010 | goto badentry; | |
1011 | } | |
1012 | entry->d_inode->i_flags |= S_DEAD; | |
1013 | } | |
1014 | dont_mount(entry); | |
1015 | clear_nlink(entry->d_inode); | |
1016 | err = 0; | |
1017 | badentry: | |
1018 | mutex_unlock(&entry->d_inode->i_mutex); | |
1019 | if (!err) | |
1020 | d_delete(entry); | |
1021 | } else { | |
1022 | err = 0; | |
1023 | } | |
3b463ae0 | 1024 | dput(entry); |
3b463ae0 JM |
1025 | |
1026 | unlock: | |
1027 | mutex_unlock(&parent->i_mutex); | |
1028 | iput(parent); | |
1029 | return err; | |
1030 | } | |
1031 | ||
87729a55 MS |
1032 | /* |
1033 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1034 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1035 | * means, that the filesystem daemon is able to record the exact |
1036 | * filesystem operations performed, and can also control the behavior | |
1037 | * of the requester process in otherwise impossible ways. For example | |
1038 | * it can delay the operation for arbitrary length of time allowing | |
1039 | * DoS against the requester. | |
1040 | * | |
1041 | * For this reason only those processes can call into the filesystem, | |
1042 | * for which the owner of the mount has ptrace privilege. This | |
1043 | * excludes processes started by other users, suid or sgid processes. | |
1044 | */ | |
c2132c1b | 1045 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1046 | { |
c69e8d9c | 1047 | const struct cred *cred; |
87729a55 | 1048 | |
c69e8d9c | 1049 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
1050 | return 1; |
1051 | ||
c2132c1b | 1052 | cred = current_cred(); |
499dcf20 EB |
1053 | if (uid_eq(cred->euid, fc->user_id) && |
1054 | uid_eq(cred->suid, fc->user_id) && | |
1055 | uid_eq(cred->uid, fc->user_id) && | |
1056 | gid_eq(cred->egid, fc->group_id) && | |
1057 | gid_eq(cred->sgid, fc->group_id) && | |
1058 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1059 | return 1; |
c69e8d9c | 1060 | |
c2132c1b | 1061 | return 0; |
87729a55 MS |
1062 | } |
1063 | ||
31d40d74 MS |
1064 | static int fuse_access(struct inode *inode, int mask) |
1065 | { | |
1066 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1067 | struct fuse_req *req; | |
1068 | struct fuse_access_in inarg; | |
1069 | int err; | |
1070 | ||
698fa1d1 MS |
1071 | BUG_ON(mask & MAY_NOT_BLOCK); |
1072 | ||
31d40d74 MS |
1073 | if (fc->no_access) |
1074 | return 0; | |
1075 | ||
b111c8c0 | 1076 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1077 | if (IS_ERR(req)) |
1078 | return PTR_ERR(req); | |
31d40d74 MS |
1079 | |
1080 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 1081 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
1082 | req->in.h.opcode = FUSE_ACCESS; |
1083 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
1084 | req->in.numargs = 1; |
1085 | req->in.args[0].size = sizeof(inarg); | |
1086 | req->in.args[0].value = &inarg; | |
b93f858a | 1087 | fuse_request_send(fc, req); |
31d40d74 MS |
1088 | err = req->out.h.error; |
1089 | fuse_put_request(fc, req); | |
1090 | if (err == -ENOSYS) { | |
1091 | fc->no_access = 1; | |
1092 | err = 0; | |
1093 | } | |
1094 | return err; | |
1095 | } | |
1096 | ||
10556cb2 | 1097 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1098 | { |
10556cb2 | 1099 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1100 | return -ECHILD; |
1101 | ||
1102 | return fuse_do_getattr(inode, NULL, NULL); | |
1103 | } | |
1104 | ||
6f9f1180 MS |
1105 | /* |
1106 | * Check permission. The two basic access models of FUSE are: | |
1107 | * | |
1108 | * 1) Local access checking ('default_permissions' mount option) based | |
1109 | * on file mode. This is the plain old disk filesystem permission | |
1110 | * modell. | |
1111 | * | |
1112 | * 2) "Remote" access checking, where server is responsible for | |
1113 | * checking permission in each inode operation. An exception to this | |
1114 | * is if ->permission() was invoked from sys_access() in which case an | |
1115 | * access request is sent. Execute permission is still checked | |
1116 | * locally based on file mode. | |
1117 | */ | |
10556cb2 | 1118 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1119 | { |
1120 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1121 | bool refreshed = false; |
1122 | int err = 0; | |
e5e5558e | 1123 | |
c2132c1b | 1124 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1125 | return -EACCES; |
244f6385 MS |
1126 | |
1127 | /* | |
e8e96157 | 1128 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1129 | */ |
e8e96157 MS |
1130 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1131 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
19690ddb MS |
1132 | struct fuse_inode *fi = get_fuse_inode(inode); |
1133 | ||
1134 | if (fi->i_time < get_jiffies_64()) { | |
1135 | refreshed = true; | |
1136 | ||
10556cb2 | 1137 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1138 | if (err) |
1139 | return err; | |
1140 | } | |
244f6385 MS |
1141 | } |
1142 | ||
1143 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
2830ba7f | 1144 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1145 | |
1146 | /* If permission is denied, try to refresh file | |
1147 | attributes. This is also needed, because the root | |
1148 | node will at first have no permissions */ | |
244f6385 | 1149 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1150 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1151 | if (!err) |
2830ba7f | 1152 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1153 | } |
1154 | ||
6f9f1180 MS |
1155 | /* Note: the opposite of the above test does not |
1156 | exist. So if permissions are revoked this won't be | |
1157 | noticed immediately, only after the attribute | |
1158 | timeout has expired */ | |
9cfcac81 | 1159 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1160 | err = fuse_access(inode, mask); |
1161 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1162 | if (!(inode->i_mode & S_IXUGO)) { | |
1163 | if (refreshed) | |
1164 | return -EACCES; | |
1165 | ||
10556cb2 | 1166 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1167 | if (!err && !(inode->i_mode & S_IXUGO)) |
1168 | return -EACCES; | |
1169 | } | |
e5e5558e | 1170 | } |
244f6385 | 1171 | return err; |
e5e5558e MS |
1172 | } |
1173 | ||
1174 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1175 | struct dir_context *ctx) |
e5e5558e MS |
1176 | { |
1177 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1178 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1179 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
e5e5558e MS |
1180 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
1181 | return -EIO; | |
1182 | if (reclen > nbytes) | |
1183 | break; | |
efeb9e60 MS |
1184 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1185 | return -EIO; | |
e5e5558e | 1186 | |
8d3af7f3 AV |
1187 | if (!dir_emit(ctx, dirent->name, dirent->namelen, |
1188 | dirent->ino, dirent->type)) | |
e5e5558e MS |
1189 | break; |
1190 | ||
1191 | buf += reclen; | |
1192 | nbytes -= reclen; | |
8d3af7f3 | 1193 | ctx->pos = dirent->off; |
e5e5558e MS |
1194 | } |
1195 | ||
1196 | return 0; | |
1197 | } | |
1198 | ||
0b05b183 AA |
1199 | static int fuse_direntplus_link(struct file *file, |
1200 | struct fuse_direntplus *direntplus, | |
1201 | u64 attr_version) | |
1202 | { | |
1203 | int err; | |
1204 | struct fuse_entry_out *o = &direntplus->entry_out; | |
1205 | struct fuse_dirent *dirent = &direntplus->dirent; | |
1206 | struct dentry *parent = file->f_path.dentry; | |
1207 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); | |
1208 | struct dentry *dentry; | |
1209 | struct dentry *alias; | |
1210 | struct inode *dir = parent->d_inode; | |
1211 | struct fuse_conn *fc; | |
1212 | struct inode *inode; | |
1213 | ||
1214 | if (!o->nodeid) { | |
1215 | /* | |
1216 | * Unlike in the case of fuse_lookup, zero nodeid does not mean | |
1217 | * ENOENT. Instead, it only means the userspace filesystem did | |
1218 | * not want to return attributes/handle for this entry. | |
1219 | * | |
1220 | * So do nothing. | |
1221 | */ | |
1222 | return 0; | |
1223 | } | |
1224 | ||
1225 | if (name.name[0] == '.') { | |
1226 | /* | |
1227 | * We could potentially refresh the attributes of the directory | |
1228 | * and its parent? | |
1229 | */ | |
1230 | if (name.len == 1) | |
1231 | return 0; | |
1232 | if (name.name[1] == '.' && name.len == 2) | |
1233 | return 0; | |
1234 | } | |
a28ef45c MS |
1235 | |
1236 | if (invalid_nodeid(o->nodeid)) | |
1237 | return -EIO; | |
1238 | if (!fuse_valid_type(o->attr.mode)) | |
1239 | return -EIO; | |
1240 | ||
0b05b183 AA |
1241 | fc = get_fuse_conn(dir); |
1242 | ||
1243 | name.hash = full_name_hash(name.name, name.len); | |
1244 | dentry = d_lookup(parent, &name); | |
53ce9a33 | 1245 | if (dentry) { |
0b05b183 | 1246 | inode = dentry->d_inode; |
53ce9a33 NV |
1247 | if (!inode) { |
1248 | d_drop(dentry); | |
a28ef45c MS |
1249 | } else if (get_node_id(inode) != o->nodeid || |
1250 | ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { | |
53ce9a33 NV |
1251 | err = d_invalidate(dentry); |
1252 | if (err) | |
1253 | goto out; | |
a28ef45c MS |
1254 | } else if (is_bad_inode(inode)) { |
1255 | err = -EIO; | |
1256 | goto out; | |
53ce9a33 | 1257 | } else { |
0b05b183 AA |
1258 | struct fuse_inode *fi; |
1259 | fi = get_fuse_inode(inode); | |
1260 | spin_lock(&fc->lock); | |
1261 | fi->nlookup++; | |
1262 | spin_unlock(&fc->lock); | |
1263 | ||
fa2b7213 MS |
1264 | fuse_change_attributes(inode, &o->attr, |
1265 | entry_attr_timeout(o), | |
1266 | attr_version); | |
1267 | ||
0b05b183 AA |
1268 | /* |
1269 | * The other branch to 'found' comes via fuse_iget() | |
1270 | * which bumps nlookup inside | |
1271 | */ | |
1272 | goto found; | |
1273 | } | |
0b05b183 | 1274 | dput(dentry); |
0b05b183 AA |
1275 | } |
1276 | ||
1277 | dentry = d_alloc(parent, &name); | |
1278 | err = -ENOMEM; | |
1279 | if (!dentry) | |
1280 | goto out; | |
1281 | ||
1282 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, | |
1283 | &o->attr, entry_attr_timeout(o), attr_version); | |
1284 | if (!inode) | |
1285 | goto out; | |
1286 | ||
5835f339 MS |
1287 | alias = fuse_materialise_dentry(dentry, inode); |
1288 | err = PTR_ERR(alias); | |
1289 | if (IS_ERR(alias)) | |
1290 | goto out; | |
2914941e | 1291 | |
0b05b183 AA |
1292 | if (alias) { |
1293 | dput(dentry); | |
1294 | dentry = alias; | |
1295 | } | |
1296 | ||
1297 | found: | |
6314efee MS |
1298 | if (fc->readdirplus_auto) |
1299 | set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state); | |
0b05b183 AA |
1300 | fuse_change_entry_timeout(dentry, o); |
1301 | ||
1302 | err = 0; | |
1303 | out: | |
c7263bcd | 1304 | dput(dentry); |
0b05b183 AA |
1305 | return err; |
1306 | } | |
1307 | ||
1308 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1309 | struct dir_context *ctx, u64 attr_version) |
0b05b183 AA |
1310 | { |
1311 | struct fuse_direntplus *direntplus; | |
1312 | struct fuse_dirent *dirent; | |
1313 | size_t reclen; | |
1314 | int over = 0; | |
1315 | int ret; | |
1316 | ||
1317 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { | |
1318 | direntplus = (struct fuse_direntplus *) buf; | |
1319 | dirent = &direntplus->dirent; | |
1320 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); | |
1321 | ||
1322 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1323 | return -EIO; | |
1324 | if (reclen > nbytes) | |
1325 | break; | |
efeb9e60 MS |
1326 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1327 | return -EIO; | |
0b05b183 AA |
1328 | |
1329 | if (!over) { | |
1330 | /* We fill entries into dstbuf only as much as | |
1331 | it can hold. But we still continue iterating | |
1332 | over remaining entries to link them. If not, | |
1333 | we need to send a FORGET for each of those | |
1334 | which we did not link. | |
1335 | */ | |
8d3af7f3 AV |
1336 | over = !dir_emit(ctx, dirent->name, dirent->namelen, |
1337 | dirent->ino, dirent->type); | |
1338 | ctx->pos = dirent->off; | |
0b05b183 AA |
1339 | } |
1340 | ||
1341 | buf += reclen; | |
1342 | nbytes -= reclen; | |
1343 | ||
1344 | ret = fuse_direntplus_link(file, direntplus, attr_version); | |
1345 | if (ret) | |
1346 | fuse_force_forget(file, direntplus->entry_out.nodeid); | |
1347 | } | |
1348 | ||
1349 | return 0; | |
1350 | } | |
1351 | ||
8d3af7f3 | 1352 | static int fuse_readdir(struct file *file, struct dir_context *ctx) |
e5e5558e | 1353 | { |
4582a4ab | 1354 | int plus, err; |
04730fef MS |
1355 | size_t nbytes; |
1356 | struct page *page; | |
496ad9aa | 1357 | struct inode *inode = file_inode(file); |
e5e5558e | 1358 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 | 1359 | struct fuse_req *req; |
0b05b183 | 1360 | u64 attr_version = 0; |
248d86e8 MS |
1361 | |
1362 | if (is_bad_inode(inode)) | |
1363 | return -EIO; | |
1364 | ||
b111c8c0 | 1365 | req = fuse_get_req(fc, 1); |
ce1d5a49 MS |
1366 | if (IS_ERR(req)) |
1367 | return PTR_ERR(req); | |
e5e5558e | 1368 | |
04730fef MS |
1369 | page = alloc_page(GFP_KERNEL); |
1370 | if (!page) { | |
1371 | fuse_put_request(fc, req); | |
1372 | return -ENOMEM; | |
1373 | } | |
4582a4ab | 1374 | |
8d3af7f3 | 1375 | plus = fuse_use_readdirplus(inode, ctx); |
f4975c67 | 1376 | req->out.argpages = 1; |
04730fef MS |
1377 | req->num_pages = 1; |
1378 | req->pages[0] = page; | |
85f40aec | 1379 | req->page_descs[0].length = PAGE_SIZE; |
4582a4ab | 1380 | if (plus) { |
0b05b183 | 1381 | attr_version = fuse_get_attr_version(fc); |
8d3af7f3 | 1382 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1383 | FUSE_READDIRPLUS); |
1384 | } else { | |
8d3af7f3 | 1385 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1386 | FUSE_READDIR); |
1387 | } | |
b93f858a | 1388 | fuse_request_send(fc, req); |
361b1eb5 | 1389 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1390 | err = req->out.h.error; |
1391 | fuse_put_request(fc, req); | |
0b05b183 | 1392 | if (!err) { |
4582a4ab | 1393 | if (plus) { |
0b05b183 | 1394 | err = parse_dirplusfile(page_address(page), nbytes, |
8d3af7f3 | 1395 | file, ctx, |
0b05b183 AA |
1396 | attr_version); |
1397 | } else { | |
1398 | err = parse_dirfile(page_address(page), nbytes, file, | |
8d3af7f3 | 1399 | ctx); |
0b05b183 AA |
1400 | } |
1401 | } | |
e5e5558e | 1402 | |
04730fef | 1403 | __free_page(page); |
b36c31ba | 1404 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 1405 | return err; |
e5e5558e MS |
1406 | } |
1407 | ||
1408 | static char *read_link(struct dentry *dentry) | |
1409 | { | |
1410 | struct inode *inode = dentry->d_inode; | |
1411 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 1412 | struct fuse_req *req = fuse_get_req_nopages(fc); |
e5e5558e MS |
1413 | char *link; |
1414 | ||
ce1d5a49 | 1415 | if (IS_ERR(req)) |
e231c2ee | 1416 | return ERR_CAST(req); |
e5e5558e MS |
1417 | |
1418 | link = (char *) __get_free_page(GFP_KERNEL); | |
1419 | if (!link) { | |
1420 | link = ERR_PTR(-ENOMEM); | |
1421 | goto out; | |
1422 | } | |
1423 | req->in.h.opcode = FUSE_READLINK; | |
1424 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1425 | req->out.argvar = 1; |
1426 | req->out.numargs = 1; | |
1427 | req->out.args[0].size = PAGE_SIZE - 1; | |
1428 | req->out.args[0].value = link; | |
b93f858a | 1429 | fuse_request_send(fc, req); |
e5e5558e MS |
1430 | if (req->out.h.error) { |
1431 | free_page((unsigned long) link); | |
1432 | link = ERR_PTR(req->out.h.error); | |
1433 | } else | |
1434 | link[req->out.args[0].size] = '\0'; | |
1435 | out: | |
1436 | fuse_put_request(fc, req); | |
b36c31ba | 1437 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
1438 | return link; |
1439 | } | |
1440 | ||
1441 | static void free_link(char *link) | |
1442 | { | |
1443 | if (!IS_ERR(link)) | |
1444 | free_page((unsigned long) link); | |
1445 | } | |
1446 | ||
1447 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1448 | { | |
1449 | nd_set_link(nd, read_link(dentry)); | |
1450 | return NULL; | |
1451 | } | |
1452 | ||
1453 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1454 | { | |
1455 | free_link(nd_get_link(nd)); | |
1456 | } | |
1457 | ||
1458 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1459 | { | |
91fe96b4 | 1460 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1461 | } |
1462 | ||
1463 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1464 | { | |
8b0797a4 MS |
1465 | fuse_release_common(file, FUSE_RELEASEDIR); |
1466 | ||
1467 | return 0; | |
e5e5558e MS |
1468 | } |
1469 | ||
02c24a82 JB |
1470 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1471 | int datasync) | |
82547981 | 1472 | { |
02c24a82 | 1473 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1474 | } |
1475 | ||
b18da0c5 MS |
1476 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1477 | unsigned long arg) | |
1478 | { | |
1479 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1480 | ||
1481 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1482 | if (fc->minor < 18) | |
1483 | return -ENOTTY; | |
1484 | ||
1485 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1486 | } | |
1487 | ||
1488 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1489 | unsigned long arg) | |
1490 | { | |
1491 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1492 | ||
1493 | if (fc->minor < 18) | |
1494 | return -ENOTTY; | |
1495 | ||
1496 | return fuse_ioctl_common(file, cmd, arg, | |
1497 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1498 | } | |
1499 | ||
17637cba MS |
1500 | static bool update_mtime(unsigned ivalid) |
1501 | { | |
1502 | /* Always update if mtime is explicitly set */ | |
1503 | if (ivalid & ATTR_MTIME_SET) | |
1504 | return true; | |
1505 | ||
1506 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ | |
1507 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1508 | return false; | |
1509 | ||
1510 | /* In all other cases update */ | |
1511 | return true; | |
1512 | } | |
1513 | ||
befc649c | 1514 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
1515 | { |
1516 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1517 | |
1518 | if (ivalid & ATTR_MODE) | |
befc649c | 1519 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1520 | if (ivalid & ATTR_UID) |
499dcf20 | 1521 | arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid); |
9e6268db | 1522 | if (ivalid & ATTR_GID) |
499dcf20 | 1523 | arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid); |
9e6268db | 1524 | if (ivalid & ATTR_SIZE) |
befc649c | 1525 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1526 | if (ivalid & ATTR_ATIME) { |
1527 | arg->valid |= FATTR_ATIME; | |
befc649c | 1528 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1529 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1530 | if (!(ivalid & ATTR_ATIME_SET)) | |
1531 | arg->valid |= FATTR_ATIME_NOW; | |
1532 | } | |
1533 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) { | |
1534 | arg->valid |= FATTR_MTIME; | |
befc649c | 1535 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba MS |
1536 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
1537 | if (!(ivalid & ATTR_MTIME_SET)) | |
1538 | arg->valid |= FATTR_MTIME_NOW; | |
befc649c | 1539 | } |
9e6268db MS |
1540 | } |
1541 | ||
3be5a52b MS |
1542 | /* |
1543 | * Prevent concurrent writepages on inode | |
1544 | * | |
1545 | * This is done by adding a negative bias to the inode write counter | |
1546 | * and waiting for all pending writes to finish. | |
1547 | */ | |
1548 | void fuse_set_nowrite(struct inode *inode) | |
1549 | { | |
1550 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1551 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1552 | ||
1553 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1554 | ||
1555 | spin_lock(&fc->lock); | |
1556 | BUG_ON(fi->writectr < 0); | |
1557 | fi->writectr += FUSE_NOWRITE; | |
1558 | spin_unlock(&fc->lock); | |
1559 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1560 | } | |
1561 | ||
1562 | /* | |
1563 | * Allow writepages on inode | |
1564 | * | |
1565 | * Remove the bias from the writecounter and send any queued | |
1566 | * writepages. | |
1567 | */ | |
1568 | static void __fuse_release_nowrite(struct inode *inode) | |
1569 | { | |
1570 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1571 | ||
1572 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1573 | fi->writectr = 0; | |
1574 | fuse_flush_writepages(inode); | |
1575 | } | |
1576 | ||
1577 | void fuse_release_nowrite(struct inode *inode) | |
1578 | { | |
1579 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1580 | ||
1581 | spin_lock(&fc->lock); | |
1582 | __fuse_release_nowrite(inode); | |
1583 | spin_unlock(&fc->lock); | |
1584 | } | |
1585 | ||
6f9f1180 MS |
1586 | /* |
1587 | * Set attributes, and at the same time refresh them. | |
1588 | * | |
1589 | * Truncation is slightly complicated, because the 'truncate' request | |
1590 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1591 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1592 | * and the actual truncation by hand. | |
6f9f1180 | 1593 | */ |
efb9fa9e MP |
1594 | int fuse_do_setattr(struct inode *inode, struct iattr *attr, |
1595 | struct file *file) | |
9e6268db | 1596 | { |
9e6268db | 1597 | struct fuse_conn *fc = get_fuse_conn(inode); |
06a7c3c2 | 1598 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db MS |
1599 | struct fuse_req *req; |
1600 | struct fuse_setattr_in inarg; | |
1601 | struct fuse_attr_out outarg; | |
3be5a52b MS |
1602 | bool is_truncate = false; |
1603 | loff_t oldsize; | |
9e6268db | 1604 | int err; |
9e6268db | 1605 | |
db78b877 CH |
1606 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1607 | attr->ia_valid |= ATTR_FORCE; | |
1608 | ||
1609 | err = inode_change_ok(inode, attr); | |
1610 | if (err) | |
1611 | return err; | |
1e9a4ed9 | 1612 | |
8d56addd MS |
1613 | if (attr->ia_valid & ATTR_OPEN) { |
1614 | if (fc->atomic_o_trunc) | |
1615 | return 0; | |
1616 | file = NULL; | |
1617 | } | |
6ff958ed | 1618 | |
2c27c65e | 1619 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1620 | is_truncate = true; |
9e6268db | 1621 | |
b111c8c0 | 1622 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1623 | if (IS_ERR(req)) |
1624 | return PTR_ERR(req); | |
9e6268db | 1625 | |
06a7c3c2 | 1626 | if (is_truncate) { |
3be5a52b | 1627 | fuse_set_nowrite(inode); |
06a7c3c2 MP |
1628 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
1629 | } | |
3be5a52b | 1630 | |
9e6268db | 1631 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1632 | memset(&outarg, 0, sizeof(outarg)); |
befc649c | 1633 | iattr_to_fattr(attr, &inarg); |
49d4914f MS |
1634 | if (file) { |
1635 | struct fuse_file *ff = file->private_data; | |
1636 | inarg.valid |= FATTR_FH; | |
1637 | inarg.fh = ff->fh; | |
1638 | } | |
f3332114 MS |
1639 | if (attr->ia_valid & ATTR_SIZE) { |
1640 | /* For mandatory locking in truncate */ | |
1641 | inarg.valid |= FATTR_LOCKOWNER; | |
1642 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1643 | } | |
9e6268db MS |
1644 | req->in.h.opcode = FUSE_SETATTR; |
1645 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1646 | req->in.numargs = 1; |
1647 | req->in.args[0].size = sizeof(inarg); | |
1648 | req->in.args[0].value = &inarg; | |
1649 | req->out.numargs = 1; | |
0e9663ee MS |
1650 | if (fc->minor < 9) |
1651 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1652 | else | |
1653 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 1654 | req->out.args[0].value = &outarg; |
b93f858a | 1655 | fuse_request_send(fc, req); |
9e6268db MS |
1656 | err = req->out.h.error; |
1657 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1658 | if (err) { |
1659 | if (err == -EINTR) | |
1660 | fuse_invalidate_attr(inode); | |
3be5a52b | 1661 | goto error; |
e00d2c2d | 1662 | } |
9e6268db | 1663 | |
e00d2c2d MS |
1664 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1665 | make_bad_inode(inode); | |
3be5a52b MS |
1666 | err = -EIO; |
1667 | goto error; | |
1668 | } | |
1669 | ||
1670 | spin_lock(&fc->lock); | |
1671 | fuse_change_attributes_common(inode, &outarg.attr, | |
1672 | attr_timeout(&outarg)); | |
1673 | oldsize = inode->i_size; | |
1674 | i_size_write(inode, outarg.attr.size); | |
1675 | ||
1676 | if (is_truncate) { | |
1677 | /* NOTE: this may release/reacquire fc->lock */ | |
1678 | __fuse_release_nowrite(inode); | |
1679 | } | |
1680 | spin_unlock(&fc->lock); | |
1681 | ||
1682 | /* | |
1683 | * Only call invalidate_inode_pages2() after removing | |
1684 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1685 | */ | |
1686 | if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1687 | truncate_pagecache(inode, outarg.attr.size); |
3be5a52b | 1688 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1689 | } |
1690 | ||
06a7c3c2 | 1691 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
e00d2c2d | 1692 | return 0; |
3be5a52b MS |
1693 | |
1694 | error: | |
1695 | if (is_truncate) | |
1696 | fuse_release_nowrite(inode); | |
1697 | ||
06a7c3c2 | 1698 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3be5a52b | 1699 | return err; |
9e6268db MS |
1700 | } |
1701 | ||
49d4914f MS |
1702 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1703 | { | |
efb9fa9e MP |
1704 | struct inode *inode = entry->d_inode; |
1705 | ||
1706 | if (!fuse_allow_current_process(get_fuse_conn(inode))) | |
1707 | return -EACCES; | |
1708 | ||
49d4914f | 1709 | if (attr->ia_valid & ATTR_FILE) |
efb9fa9e | 1710 | return fuse_do_setattr(inode, attr, attr->ia_file); |
49d4914f | 1711 | else |
efb9fa9e | 1712 | return fuse_do_setattr(inode, attr, NULL); |
49d4914f MS |
1713 | } |
1714 | ||
e5e5558e MS |
1715 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1716 | struct kstat *stat) | |
1717 | { | |
1718 | struct inode *inode = entry->d_inode; | |
244f6385 | 1719 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1720 | |
c2132c1b | 1721 | if (!fuse_allow_current_process(fc)) |
244f6385 MS |
1722 | return -EACCES; |
1723 | ||
bcb4be80 | 1724 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1725 | } |
1726 | ||
92a8780e MS |
1727 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1728 | const void *value, size_t size, int flags) | |
1729 | { | |
1730 | struct inode *inode = entry->d_inode; | |
1731 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1732 | struct fuse_req *req; | |
1733 | struct fuse_setxattr_in inarg; | |
1734 | int err; | |
1735 | ||
92a8780e MS |
1736 | if (fc->no_setxattr) |
1737 | return -EOPNOTSUPP; | |
1738 | ||
b111c8c0 | 1739 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1740 | if (IS_ERR(req)) |
1741 | return PTR_ERR(req); | |
92a8780e MS |
1742 | |
1743 | memset(&inarg, 0, sizeof(inarg)); | |
1744 | inarg.size = size; | |
1745 | inarg.flags = flags; | |
1746 | req->in.h.opcode = FUSE_SETXATTR; | |
1747 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1748 | req->in.numargs = 3; |
1749 | req->in.args[0].size = sizeof(inarg); | |
1750 | req->in.args[0].value = &inarg; | |
1751 | req->in.args[1].size = strlen(name) + 1; | |
1752 | req->in.args[1].value = name; | |
1753 | req->in.args[2].size = size; | |
1754 | req->in.args[2].value = value; | |
b93f858a | 1755 | fuse_request_send(fc, req); |
92a8780e MS |
1756 | err = req->out.h.error; |
1757 | fuse_put_request(fc, req); | |
1758 | if (err == -ENOSYS) { | |
1759 | fc->no_setxattr = 1; | |
1760 | err = -EOPNOTSUPP; | |
1761 | } | |
d331a415 AA |
1762 | if (!err) |
1763 | fuse_invalidate_attr(inode); | |
92a8780e MS |
1764 | return err; |
1765 | } | |
1766 | ||
1767 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1768 | void *value, size_t size) | |
1769 | { | |
1770 | struct inode *inode = entry->d_inode; | |
1771 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1772 | struct fuse_req *req; | |
1773 | struct fuse_getxattr_in inarg; | |
1774 | struct fuse_getxattr_out outarg; | |
1775 | ssize_t ret; | |
1776 | ||
1777 | if (fc->no_getxattr) | |
1778 | return -EOPNOTSUPP; | |
1779 | ||
b111c8c0 | 1780 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1781 | if (IS_ERR(req)) |
1782 | return PTR_ERR(req); | |
92a8780e MS |
1783 | |
1784 | memset(&inarg, 0, sizeof(inarg)); | |
1785 | inarg.size = size; | |
1786 | req->in.h.opcode = FUSE_GETXATTR; | |
1787 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1788 | req->in.numargs = 2; |
1789 | req->in.args[0].size = sizeof(inarg); | |
1790 | req->in.args[0].value = &inarg; | |
1791 | req->in.args[1].size = strlen(name) + 1; | |
1792 | req->in.args[1].value = name; | |
1793 | /* This is really two different operations rolled into one */ | |
1794 | req->out.numargs = 1; | |
1795 | if (size) { | |
1796 | req->out.argvar = 1; | |
1797 | req->out.args[0].size = size; | |
1798 | req->out.args[0].value = value; | |
1799 | } else { | |
1800 | req->out.args[0].size = sizeof(outarg); | |
1801 | req->out.args[0].value = &outarg; | |
1802 | } | |
b93f858a | 1803 | fuse_request_send(fc, req); |
92a8780e MS |
1804 | ret = req->out.h.error; |
1805 | if (!ret) | |
1806 | ret = size ? req->out.args[0].size : outarg.size; | |
1807 | else { | |
1808 | if (ret == -ENOSYS) { | |
1809 | fc->no_getxattr = 1; | |
1810 | ret = -EOPNOTSUPP; | |
1811 | } | |
1812 | } | |
1813 | fuse_put_request(fc, req); | |
1814 | return ret; | |
1815 | } | |
1816 | ||
1817 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1818 | { | |
1819 | struct inode *inode = entry->d_inode; | |
1820 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1821 | struct fuse_req *req; | |
1822 | struct fuse_getxattr_in inarg; | |
1823 | struct fuse_getxattr_out outarg; | |
1824 | ssize_t ret; | |
1825 | ||
c2132c1b | 1826 | if (!fuse_allow_current_process(fc)) |
e57ac683 MS |
1827 | return -EACCES; |
1828 | ||
92a8780e MS |
1829 | if (fc->no_listxattr) |
1830 | return -EOPNOTSUPP; | |
1831 | ||
b111c8c0 | 1832 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1833 | if (IS_ERR(req)) |
1834 | return PTR_ERR(req); | |
92a8780e MS |
1835 | |
1836 | memset(&inarg, 0, sizeof(inarg)); | |
1837 | inarg.size = size; | |
1838 | req->in.h.opcode = FUSE_LISTXATTR; | |
1839 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1840 | req->in.numargs = 1; |
1841 | req->in.args[0].size = sizeof(inarg); | |
1842 | req->in.args[0].value = &inarg; | |
1843 | /* This is really two different operations rolled into one */ | |
1844 | req->out.numargs = 1; | |
1845 | if (size) { | |
1846 | req->out.argvar = 1; | |
1847 | req->out.args[0].size = size; | |
1848 | req->out.args[0].value = list; | |
1849 | } else { | |
1850 | req->out.args[0].size = sizeof(outarg); | |
1851 | req->out.args[0].value = &outarg; | |
1852 | } | |
b93f858a | 1853 | fuse_request_send(fc, req); |
92a8780e MS |
1854 | ret = req->out.h.error; |
1855 | if (!ret) | |
1856 | ret = size ? req->out.args[0].size : outarg.size; | |
1857 | else { | |
1858 | if (ret == -ENOSYS) { | |
1859 | fc->no_listxattr = 1; | |
1860 | ret = -EOPNOTSUPP; | |
1861 | } | |
1862 | } | |
1863 | fuse_put_request(fc, req); | |
1864 | return ret; | |
1865 | } | |
1866 | ||
1867 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1868 | { | |
1869 | struct inode *inode = entry->d_inode; | |
1870 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1871 | struct fuse_req *req; | |
1872 | int err; | |
1873 | ||
1874 | if (fc->no_removexattr) | |
1875 | return -EOPNOTSUPP; | |
1876 | ||
b111c8c0 | 1877 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1878 | if (IS_ERR(req)) |
1879 | return PTR_ERR(req); | |
92a8780e MS |
1880 | |
1881 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1882 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1883 | req->in.numargs = 1; |
1884 | req->in.args[0].size = strlen(name) + 1; | |
1885 | req->in.args[0].value = name; | |
b93f858a | 1886 | fuse_request_send(fc, req); |
92a8780e MS |
1887 | err = req->out.h.error; |
1888 | fuse_put_request(fc, req); | |
1889 | if (err == -ENOSYS) { | |
1890 | fc->no_removexattr = 1; | |
1891 | err = -EOPNOTSUPP; | |
1892 | } | |
d331a415 AA |
1893 | if (!err) |
1894 | fuse_invalidate_attr(inode); | |
92a8780e MS |
1895 | return err; |
1896 | } | |
1897 | ||
754661f1 | 1898 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1899 | .lookup = fuse_lookup, |
9e6268db MS |
1900 | .mkdir = fuse_mkdir, |
1901 | .symlink = fuse_symlink, | |
1902 | .unlink = fuse_unlink, | |
1903 | .rmdir = fuse_rmdir, | |
1904 | .rename = fuse_rename, | |
1905 | .link = fuse_link, | |
1906 | .setattr = fuse_setattr, | |
1907 | .create = fuse_create, | |
c8ccbe03 | 1908 | .atomic_open = fuse_atomic_open, |
9e6268db | 1909 | .mknod = fuse_mknod, |
e5e5558e MS |
1910 | .permission = fuse_permission, |
1911 | .getattr = fuse_getattr, | |
92a8780e MS |
1912 | .setxattr = fuse_setxattr, |
1913 | .getxattr = fuse_getxattr, | |
1914 | .listxattr = fuse_listxattr, | |
1915 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1916 | }; |
1917 | ||
4b6f5d20 | 1918 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1919 | .llseek = generic_file_llseek, |
e5e5558e | 1920 | .read = generic_read_dir, |
8d3af7f3 | 1921 | .iterate = fuse_readdir, |
e5e5558e MS |
1922 | .open = fuse_dir_open, |
1923 | .release = fuse_dir_release, | |
82547981 | 1924 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1925 | .unlocked_ioctl = fuse_dir_ioctl, |
1926 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1927 | }; |
1928 | ||
754661f1 | 1929 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1930 | .setattr = fuse_setattr, |
e5e5558e MS |
1931 | .permission = fuse_permission, |
1932 | .getattr = fuse_getattr, | |
92a8780e MS |
1933 | .setxattr = fuse_setxattr, |
1934 | .getxattr = fuse_getxattr, | |
1935 | .listxattr = fuse_listxattr, | |
1936 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1937 | }; |
1938 | ||
754661f1 | 1939 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1940 | .setattr = fuse_setattr, |
e5e5558e MS |
1941 | .follow_link = fuse_follow_link, |
1942 | .put_link = fuse_put_link, | |
1943 | .readlink = generic_readlink, | |
1944 | .getattr = fuse_getattr, | |
92a8780e MS |
1945 | .setxattr = fuse_setxattr, |
1946 | .getxattr = fuse_getxattr, | |
1947 | .listxattr = fuse_listxattr, | |
1948 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1949 | }; |
1950 | ||
1951 | void fuse_init_common(struct inode *inode) | |
1952 | { | |
1953 | inode->i_op = &fuse_common_inode_operations; | |
1954 | } | |
1955 | ||
1956 | void fuse_init_dir(struct inode *inode) | |
1957 | { | |
1958 | inode->i_op = &fuse_dir_inode_operations; | |
1959 | inode->i_fop = &fuse_dir_operations; | |
1960 | } | |
1961 | ||
1962 | void fuse_init_symlink(struct inode *inode) | |
1963 | { | |
1964 | inode->i_op = &fuse_symlink_inode_operations; | |
1965 | } |