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 | ||
345 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 346 | unsigned int flags) |
c180eebe MS |
347 | { |
348 | int err; | |
349 | struct fuse_entry_out outarg; | |
350 | struct inode *inode; | |
351 | struct dentry *newent; | |
c180eebe MS |
352 | bool outarg_valid = true; |
353 | ||
354 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, | |
355 | &outarg, &inode); | |
356 | if (err == -ENOENT) { | |
357 | outarg_valid = false; | |
358 | err = 0; | |
359 | } | |
360 | if (err) | |
361 | goto out_err; | |
362 | ||
363 | err = -EIO; | |
364 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
365 | goto out_iput; | |
e5e5558e | 366 | |
b70a80e7 | 367 | newent = d_materialise_unique(entry, inode); |
5835f339 MS |
368 | err = PTR_ERR(newent); |
369 | if (IS_ERR(newent)) | |
370 | goto out_err; | |
d2a85164 | 371 | |
0de6256d | 372 | entry = newent ? newent : entry; |
c180eebe | 373 | if (outarg_valid) |
1fb69e78 | 374 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
375 | else |
376 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 377 | |
4582a4ab | 378 | fuse_advise_use_readdirplus(dir); |
0de6256d | 379 | return newent; |
c180eebe MS |
380 | |
381 | out_iput: | |
382 | iput(inode); | |
383 | out_err: | |
384 | return ERR_PTR(err); | |
e5e5558e MS |
385 | } |
386 | ||
6f9f1180 MS |
387 | /* |
388 | * Atomic create+open operation | |
389 | * | |
390 | * If the filesystem doesn't support this, then fall back to separate | |
391 | * 'mknod' + 'open' requests. | |
392 | */ | |
d9585277 | 393 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 394 | struct file *file, unsigned flags, |
d9585277 | 395 | umode_t mode, int *opened) |
fd72faac MS |
396 | { |
397 | int err; | |
398 | struct inode *inode; | |
399 | struct fuse_conn *fc = get_fuse_conn(dir); | |
400 | struct fuse_req *req; | |
07e77dca | 401 | struct fuse_forget_link *forget; |
e0a43ddc | 402 | struct fuse_create_in inarg; |
fd72faac MS |
403 | struct fuse_open_out outopen; |
404 | struct fuse_entry_out outentry; | |
fd72faac | 405 | struct fuse_file *ff; |
fd72faac | 406 | |
af109bca MS |
407 | /* Userspace expects S_IFREG in create mode */ |
408 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
409 | ||
07e77dca | 410 | forget = fuse_alloc_forget(); |
c8ccbe03 | 411 | err = -ENOMEM; |
07e77dca | 412 | if (!forget) |
c8ccbe03 | 413 | goto out_err; |
51eb01e7 | 414 | |
b111c8c0 | 415 | req = fuse_get_req_nopages(fc); |
51eb01e7 | 416 | err = PTR_ERR(req); |
ce1d5a49 | 417 | if (IS_ERR(req)) |
51eb01e7 | 418 | goto out_put_forget_req; |
fd72faac | 419 | |
ce1d5a49 | 420 | err = -ENOMEM; |
acf99433 | 421 | ff = fuse_file_alloc(fc); |
fd72faac MS |
422 | if (!ff) |
423 | goto out_put_request; | |
424 | ||
e0a43ddc MS |
425 | if (!fc->dont_mask) |
426 | mode &= ~current_umask(); | |
427 | ||
fd72faac MS |
428 | flags &= ~O_NOCTTY; |
429 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 430 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
431 | inarg.flags = flags; |
432 | inarg.mode = mode; | |
e0a43ddc | 433 | inarg.umask = current_umask(); |
fd72faac MS |
434 | req->in.h.opcode = FUSE_CREATE; |
435 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac | 436 | req->in.numargs = 2; |
e0a43ddc MS |
437 | req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : |
438 | sizeof(inarg); | |
fd72faac MS |
439 | req->in.args[0].value = &inarg; |
440 | req->in.args[1].size = entry->d_name.len + 1; | |
441 | req->in.args[1].value = entry->d_name.name; | |
442 | req->out.numargs = 2; | |
0e9663ee MS |
443 | if (fc->minor < 9) |
444 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
445 | else | |
446 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
447 | req->out.args[0].value = &outentry; |
448 | req->out.args[1].size = sizeof(outopen); | |
449 | req->out.args[1].value = &outopen; | |
b93f858a | 450 | fuse_request_send(fc, req); |
fd72faac | 451 | err = req->out.h.error; |
c8ccbe03 | 452 | if (err) |
fd72faac | 453 | goto out_free_ff; |
fd72faac MS |
454 | |
455 | err = -EIO; | |
2827d0b2 | 456 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
457 | goto out_free_ff; |
458 | ||
51eb01e7 | 459 | fuse_put_request(fc, req); |
c7b7143c MS |
460 | ff->fh = outopen.fh; |
461 | ff->nodeid = outentry.nodeid; | |
462 | ff->open_flags = outopen.open_flags; | |
fd72faac | 463 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 464 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
465 | if (!inode) { |
466 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 467 | fuse_sync_release(ff, flags); |
07e77dca | 468 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
469 | err = -ENOMEM; |
470 | goto out_err; | |
fd72faac | 471 | } |
07e77dca | 472 | kfree(forget); |
fd72faac | 473 | d_instantiate(entry, inode); |
1fb69e78 | 474 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 475 | fuse_invalidate_attr(dir); |
30d90494 AV |
476 | err = finish_open(file, entry, generic_file_open, opened); |
477 | if (err) { | |
8b0797a4 | 478 | fuse_sync_release(ff, flags); |
c8ccbe03 MS |
479 | } else { |
480 | file->private_data = fuse_file_get(ff); | |
481 | fuse_finish_open(inode, file); | |
fd72faac | 482 | } |
d9585277 | 483 | return err; |
fd72faac | 484 | |
c8ccbe03 | 485 | out_free_ff: |
fd72faac | 486 | fuse_file_free(ff); |
c8ccbe03 | 487 | out_put_request: |
fd72faac | 488 | fuse_put_request(fc, req); |
c8ccbe03 | 489 | out_put_forget_req: |
07e77dca | 490 | kfree(forget); |
c8ccbe03 | 491 | out_err: |
d9585277 | 492 | return err; |
c8ccbe03 MS |
493 | } |
494 | ||
495 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 496 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 497 | struct file *file, unsigned flags, |
d9585277 | 498 | umode_t mode, int *opened) |
c8ccbe03 MS |
499 | { |
500 | int err; | |
501 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
502 | struct dentry *res = NULL; |
503 | ||
504 | if (d_unhashed(entry)) { | |
00cd8dd3 | 505 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 506 | if (IS_ERR(res)) |
d9585277 | 507 | return PTR_ERR(res); |
c8ccbe03 MS |
508 | |
509 | if (res) | |
510 | entry = res; | |
511 | } | |
512 | ||
513 | if (!(flags & O_CREAT) || entry->d_inode) | |
514 | goto no_open; | |
515 | ||
516 | /* Only creates */ | |
47237687 | 517 | *opened |= FILE_CREATED; |
c8ccbe03 MS |
518 | |
519 | if (fc->no_create) | |
520 | goto mknod; | |
521 | ||
30d90494 | 522 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
d9585277 | 523 | if (err == -ENOSYS) { |
c8ccbe03 MS |
524 | fc->no_create = 1; |
525 | goto mknod; | |
526 | } | |
527 | out_dput: | |
528 | dput(res); | |
d9585277 | 529 | return err; |
c8ccbe03 MS |
530 | |
531 | mknod: | |
532 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 533 | if (err) |
c8ccbe03 | 534 | goto out_dput; |
c8ccbe03 | 535 | no_open: |
e45198a6 | 536 | return finish_no_open(file, res); |
fd72faac MS |
537 | } |
538 | ||
6f9f1180 MS |
539 | /* |
540 | * Code shared between mknod, mkdir, symlink and link | |
541 | */ | |
9e6268db MS |
542 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
543 | struct inode *dir, struct dentry *entry, | |
541af6a0 | 544 | umode_t mode) |
9e6268db MS |
545 | { |
546 | struct fuse_entry_out outarg; | |
547 | struct inode *inode; | |
9e6268db | 548 | int err; |
07e77dca | 549 | struct fuse_forget_link *forget; |
2d51013e | 550 | |
07e77dca MS |
551 | forget = fuse_alloc_forget(); |
552 | if (!forget) { | |
2d51013e | 553 | fuse_put_request(fc, req); |
07e77dca | 554 | return -ENOMEM; |
2d51013e | 555 | } |
9e6268db | 556 | |
0e9663ee | 557 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 558 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 559 | req->out.numargs = 1; |
0e9663ee MS |
560 | if (fc->minor < 9) |
561 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
562 | else | |
563 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 564 | req->out.args[0].value = &outarg; |
b93f858a | 565 | fuse_request_send(fc, req); |
9e6268db | 566 | err = req->out.h.error; |
2d51013e MS |
567 | fuse_put_request(fc, req); |
568 | if (err) | |
569 | goto out_put_forget_req; | |
570 | ||
39ee059a MS |
571 | err = -EIO; |
572 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 573 | goto out_put_forget_req; |
39ee059a MS |
574 | |
575 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 576 | goto out_put_forget_req; |
39ee059a | 577 | |
9e6268db | 578 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 579 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 580 | if (!inode) { |
07e77dca | 581 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
582 | return -ENOMEM; |
583 | } | |
07e77dca | 584 | kfree(forget); |
9e6268db | 585 | |
b70a80e7 MS |
586 | err = d_instantiate_no_diralias(entry, inode); |
587 | if (err) | |
588 | return err; | |
9e6268db | 589 | |
1fb69e78 | 590 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
591 | fuse_invalidate_attr(dir); |
592 | return 0; | |
39ee059a | 593 | |
2d51013e | 594 | out_put_forget_req: |
07e77dca | 595 | kfree(forget); |
39ee059a | 596 | return err; |
9e6268db MS |
597 | } |
598 | ||
1a67aafb | 599 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
600 | dev_t rdev) |
601 | { | |
602 | struct fuse_mknod_in inarg; | |
603 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 604 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
605 | if (IS_ERR(req)) |
606 | return PTR_ERR(req); | |
9e6268db | 607 | |
e0a43ddc MS |
608 | if (!fc->dont_mask) |
609 | mode &= ~current_umask(); | |
610 | ||
9e6268db MS |
611 | memset(&inarg, 0, sizeof(inarg)); |
612 | inarg.mode = mode; | |
613 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 614 | inarg.umask = current_umask(); |
9e6268db MS |
615 | req->in.h.opcode = FUSE_MKNOD; |
616 | req->in.numargs = 2; | |
e0a43ddc MS |
617 | req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : |
618 | sizeof(inarg); | |
9e6268db MS |
619 | req->in.args[0].value = &inarg; |
620 | req->in.args[1].size = entry->d_name.len + 1; | |
621 | req->in.args[1].value = entry->d_name.name; | |
622 | return create_new_entry(fc, req, dir, entry, mode); | |
623 | } | |
624 | ||
4acdaf27 | 625 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
ebfc3b49 | 626 | bool excl) |
9e6268db MS |
627 | { |
628 | return fuse_mknod(dir, entry, mode, 0); | |
629 | } | |
630 | ||
18bb1db3 | 631 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
632 | { |
633 | struct fuse_mkdir_in inarg; | |
634 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 635 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
636 | if (IS_ERR(req)) |
637 | return PTR_ERR(req); | |
9e6268db | 638 | |
e0a43ddc MS |
639 | if (!fc->dont_mask) |
640 | mode &= ~current_umask(); | |
641 | ||
9e6268db MS |
642 | memset(&inarg, 0, sizeof(inarg)); |
643 | inarg.mode = mode; | |
e0a43ddc | 644 | inarg.umask = current_umask(); |
9e6268db MS |
645 | req->in.h.opcode = FUSE_MKDIR; |
646 | req->in.numargs = 2; | |
647 | req->in.args[0].size = sizeof(inarg); | |
648 | req->in.args[0].value = &inarg; | |
649 | req->in.args[1].size = entry->d_name.len + 1; | |
650 | req->in.args[1].value = entry->d_name.name; | |
651 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
652 | } | |
653 | ||
654 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
655 | const char *link) | |
656 | { | |
657 | struct fuse_conn *fc = get_fuse_conn(dir); | |
658 | unsigned len = strlen(link) + 1; | |
b111c8c0 | 659 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
660 | if (IS_ERR(req)) |
661 | return PTR_ERR(req); | |
9e6268db MS |
662 | |
663 | req->in.h.opcode = FUSE_SYMLINK; | |
664 | req->in.numargs = 2; | |
665 | req->in.args[0].size = entry->d_name.len + 1; | |
666 | req->in.args[0].value = entry->d_name.name; | |
667 | req->in.args[1].size = len; | |
668 | req->in.args[1].value = link; | |
669 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
670 | } | |
671 | ||
672 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
673 | { | |
674 | int err; | |
675 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 676 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
677 | if (IS_ERR(req)) |
678 | return PTR_ERR(req); | |
9e6268db MS |
679 | |
680 | req->in.h.opcode = FUSE_UNLINK; | |
681 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
682 | req->in.numargs = 1; |
683 | req->in.args[0].size = entry->d_name.len + 1; | |
684 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 685 | fuse_request_send(fc, req); |
9e6268db MS |
686 | err = req->out.h.error; |
687 | fuse_put_request(fc, req); | |
688 | if (!err) { | |
689 | struct inode *inode = entry->d_inode; | |
ac45d613 | 690 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 691 | |
ac45d613 MS |
692 | spin_lock(&fc->lock); |
693 | fi->attr_version = ++fc->attr_version; | |
dfca7ceb MS |
694 | /* |
695 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
696 | * happen if userspace filesystem is careless. It would be | |
697 | * difficult to enforce correct nlink usage so just ignore this | |
698 | * condition here | |
699 | */ | |
700 | if (inode->i_nlink > 0) | |
701 | drop_nlink(inode); | |
ac45d613 | 702 | spin_unlock(&fc->lock); |
9e6268db MS |
703 | fuse_invalidate_attr(inode); |
704 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 705 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
706 | } else if (err == -EINTR) |
707 | fuse_invalidate_entry(entry); | |
708 | return err; | |
709 | } | |
710 | ||
711 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
712 | { | |
713 | int err; | |
714 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 715 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
716 | if (IS_ERR(req)) |
717 | return PTR_ERR(req); | |
9e6268db MS |
718 | |
719 | req->in.h.opcode = FUSE_RMDIR; | |
720 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
721 | req->in.numargs = 1; |
722 | req->in.args[0].size = entry->d_name.len + 1; | |
723 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 724 | fuse_request_send(fc, req); |
9e6268db MS |
725 | err = req->out.h.error; |
726 | fuse_put_request(fc, req); | |
727 | if (!err) { | |
ce71ec36 | 728 | clear_nlink(entry->d_inode); |
9e6268db | 729 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 730 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
731 | } else if (err == -EINTR) |
732 | fuse_invalidate_entry(entry); | |
733 | return err; | |
734 | } | |
735 | ||
736 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
737 | struct inode *newdir, struct dentry *newent) | |
738 | { | |
739 | int err; | |
740 | struct fuse_rename_in inarg; | |
741 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
b111c8c0 | 742 | struct fuse_req *req = fuse_get_req_nopages(fc); |
e4eaac06 | 743 | |
ce1d5a49 MS |
744 | if (IS_ERR(req)) |
745 | return PTR_ERR(req); | |
9e6268db MS |
746 | |
747 | memset(&inarg, 0, sizeof(inarg)); | |
748 | inarg.newdir = get_node_id(newdir); | |
749 | req->in.h.opcode = FUSE_RENAME; | |
750 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
751 | req->in.numargs = 3; |
752 | req->in.args[0].size = sizeof(inarg); | |
753 | req->in.args[0].value = &inarg; | |
754 | req->in.args[1].size = oldent->d_name.len + 1; | |
755 | req->in.args[1].value = oldent->d_name.name; | |
756 | req->in.args[2].size = newent->d_name.len + 1; | |
757 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 758 | fuse_request_send(fc, req); |
9e6268db MS |
759 | err = req->out.h.error; |
760 | fuse_put_request(fc, req); | |
761 | if (!err) { | |
08b63307 MS |
762 | /* ctime changes */ |
763 | fuse_invalidate_attr(oldent->d_inode); | |
764 | ||
9e6268db MS |
765 | fuse_invalidate_attr(olddir); |
766 | if (olddir != newdir) | |
767 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
768 | |
769 | /* newent will end up negative */ | |
5219f346 MS |
770 | if (newent->d_inode) { |
771 | fuse_invalidate_attr(newent->d_inode); | |
8cbdf1e6 | 772 | fuse_invalidate_entry_cache(newent); |
5219f346 | 773 | } |
9e6268db MS |
774 | } else if (err == -EINTR) { |
775 | /* If request was interrupted, DEITY only knows if the | |
776 | rename actually took place. If the invalidation | |
777 | fails (e.g. some process has CWD under the renamed | |
778 | directory), then there can be inconsistency between | |
779 | the dcache and the real filesystem. Tough luck. */ | |
780 | fuse_invalidate_entry(oldent); | |
781 | if (newent->d_inode) | |
782 | fuse_invalidate_entry(newent); | |
783 | } | |
784 | ||
785 | return err; | |
786 | } | |
787 | ||
788 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
789 | struct dentry *newent) | |
790 | { | |
791 | int err; | |
792 | struct fuse_link_in inarg; | |
793 | struct inode *inode = entry->d_inode; | |
794 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 795 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
796 | if (IS_ERR(req)) |
797 | return PTR_ERR(req); | |
9e6268db MS |
798 | |
799 | memset(&inarg, 0, sizeof(inarg)); | |
800 | inarg.oldnodeid = get_node_id(inode); | |
801 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
802 | req->in.numargs = 2; |
803 | req->in.args[0].size = sizeof(inarg); | |
804 | req->in.args[0].value = &inarg; | |
805 | req->in.args[1].size = newent->d_name.len + 1; | |
806 | req->in.args[1].value = newent->d_name.name; | |
807 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
808 | /* Contrary to "normal" filesystems it can happen that link | |
809 | makes two "logical" inodes point to the same "physical" | |
810 | inode. We invalidate the attributes of the old one, so it | |
811 | will reflect changes in the backing inode (link count, | |
812 | etc.) | |
813 | */ | |
ac45d613 MS |
814 | if (!err) { |
815 | struct fuse_inode *fi = get_fuse_inode(inode); | |
816 | ||
817 | spin_lock(&fc->lock); | |
818 | fi->attr_version = ++fc->attr_version; | |
819 | inc_nlink(inode); | |
820 | spin_unlock(&fc->lock); | |
9e6268db | 821 | fuse_invalidate_attr(inode); |
ac45d613 MS |
822 | } else if (err == -EINTR) { |
823 | fuse_invalidate_attr(inode); | |
824 | } | |
9e6268db MS |
825 | return err; |
826 | } | |
827 | ||
1fb69e78 MS |
828 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
829 | struct kstat *stat) | |
830 | { | |
203627bb MS |
831 | unsigned int blkbits; |
832 | ||
1fb69e78 MS |
833 | stat->dev = inode->i_sb->s_dev; |
834 | stat->ino = attr->ino; | |
835 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
836 | stat->nlink = attr->nlink; | |
499dcf20 EB |
837 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
838 | stat->gid = make_kgid(&init_user_ns, attr->gid); | |
1fb69e78 MS |
839 | stat->rdev = inode->i_rdev; |
840 | stat->atime.tv_sec = attr->atime; | |
841 | stat->atime.tv_nsec = attr->atimensec; | |
842 | stat->mtime.tv_sec = attr->mtime; | |
843 | stat->mtime.tv_nsec = attr->mtimensec; | |
844 | stat->ctime.tv_sec = attr->ctime; | |
845 | stat->ctime.tv_nsec = attr->ctimensec; | |
846 | stat->size = attr->size; | |
847 | stat->blocks = attr->blocks; | |
203627bb MS |
848 | |
849 | if (attr->blksize != 0) | |
850 | blkbits = ilog2(attr->blksize); | |
851 | else | |
852 | blkbits = inode->i_sb->s_blocksize_bits; | |
853 | ||
854 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
855 | } |
856 | ||
c79e322f MS |
857 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
858 | struct file *file) | |
e5e5558e MS |
859 | { |
860 | int err; | |
c79e322f MS |
861 | struct fuse_getattr_in inarg; |
862 | struct fuse_attr_out outarg; | |
e5e5558e | 863 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
864 | struct fuse_req *req; |
865 | u64 attr_version; | |
866 | ||
b111c8c0 | 867 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
868 | if (IS_ERR(req)) |
869 | return PTR_ERR(req); | |
e5e5558e | 870 | |
7dca9fd3 | 871 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 872 | |
c79e322f | 873 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 874 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
875 | /* Directories have separate file-handle space */ |
876 | if (file && S_ISREG(inode->i_mode)) { | |
877 | struct fuse_file *ff = file->private_data; | |
878 | ||
879 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
880 | inarg.fh = ff->fh; | |
881 | } | |
e5e5558e MS |
882 | req->in.h.opcode = FUSE_GETATTR; |
883 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
884 | req->in.numargs = 1; |
885 | req->in.args[0].size = sizeof(inarg); | |
886 | req->in.args[0].value = &inarg; | |
e5e5558e | 887 | req->out.numargs = 1; |
0e9663ee MS |
888 | if (fc->minor < 9) |
889 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
890 | else | |
891 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 892 | req->out.args[0].value = &outarg; |
b93f858a | 893 | fuse_request_send(fc, req); |
e5e5558e MS |
894 | err = req->out.h.error; |
895 | fuse_put_request(fc, req); | |
896 | if (!err) { | |
c79e322f | 897 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
898 | make_bad_inode(inode); |
899 | err = -EIO; | |
900 | } else { | |
c79e322f MS |
901 | fuse_change_attributes(inode, &outarg.attr, |
902 | attr_timeout(&outarg), | |
1fb69e78 MS |
903 | attr_version); |
904 | if (stat) | |
c79e322f | 905 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
906 | } |
907 | } | |
908 | return err; | |
909 | } | |
910 | ||
bcb4be80 MS |
911 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
912 | struct file *file, bool *refreshed) | |
913 | { | |
914 | struct fuse_inode *fi = get_fuse_inode(inode); | |
915 | int err; | |
916 | bool r; | |
917 | ||
918 | if (fi->i_time < get_jiffies_64()) { | |
919 | r = true; | |
920 | err = fuse_do_getattr(inode, stat, file); | |
921 | } else { | |
922 | r = false; | |
923 | err = 0; | |
924 | if (stat) { | |
925 | generic_fillattr(inode, stat); | |
926 | stat->mode = fi->orig_i_mode; | |
45c72cd7 | 927 | stat->ino = fi->orig_ino; |
bcb4be80 MS |
928 | } |
929 | } | |
930 | ||
931 | if (refreshed != NULL) | |
932 | *refreshed = r; | |
933 | ||
934 | return err; | |
935 | } | |
936 | ||
3b463ae0 | 937 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 938 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
939 | { |
940 | int err = -ENOTDIR; | |
941 | struct inode *parent; | |
942 | struct dentry *dir; | |
943 | struct dentry *entry; | |
944 | ||
945 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
946 | if (!parent) | |
947 | return -ENOENT; | |
948 | ||
949 | mutex_lock(&parent->i_mutex); | |
950 | if (!S_ISDIR(parent->i_mode)) | |
951 | goto unlock; | |
952 | ||
953 | err = -ENOENT; | |
954 | dir = d_find_alias(parent); | |
955 | if (!dir) | |
956 | goto unlock; | |
957 | ||
958 | entry = d_lookup(dir, name); | |
959 | dput(dir); | |
960 | if (!entry) | |
961 | goto unlock; | |
962 | ||
963 | fuse_invalidate_attr(parent); | |
964 | fuse_invalidate_entry(entry); | |
451d0f59 JM |
965 | |
966 | if (child_nodeid != 0 && entry->d_inode) { | |
967 | mutex_lock(&entry->d_inode->i_mutex); | |
968 | if (get_node_id(entry->d_inode) != child_nodeid) { | |
969 | err = -ENOENT; | |
970 | goto badentry; | |
971 | } | |
972 | if (d_mountpoint(entry)) { | |
973 | err = -EBUSY; | |
974 | goto badentry; | |
975 | } | |
976 | if (S_ISDIR(entry->d_inode->i_mode)) { | |
977 | shrink_dcache_parent(entry); | |
978 | if (!simple_empty(entry)) { | |
979 | err = -ENOTEMPTY; | |
980 | goto badentry; | |
981 | } | |
982 | entry->d_inode->i_flags |= S_DEAD; | |
983 | } | |
984 | dont_mount(entry); | |
985 | clear_nlink(entry->d_inode); | |
986 | err = 0; | |
987 | badentry: | |
988 | mutex_unlock(&entry->d_inode->i_mutex); | |
989 | if (!err) | |
990 | d_delete(entry); | |
991 | } else { | |
992 | err = 0; | |
993 | } | |
3b463ae0 | 994 | dput(entry); |
3b463ae0 JM |
995 | |
996 | unlock: | |
997 | mutex_unlock(&parent->i_mutex); | |
998 | iput(parent); | |
999 | return err; | |
1000 | } | |
1001 | ||
87729a55 MS |
1002 | /* |
1003 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1004 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1005 | * means, that the filesystem daemon is able to record the exact |
1006 | * filesystem operations performed, and can also control the behavior | |
1007 | * of the requester process in otherwise impossible ways. For example | |
1008 | * it can delay the operation for arbitrary length of time allowing | |
1009 | * DoS against the requester. | |
1010 | * | |
1011 | * For this reason only those processes can call into the filesystem, | |
1012 | * for which the owner of the mount has ptrace privilege. This | |
1013 | * excludes processes started by other users, suid or sgid processes. | |
1014 | */ | |
c2132c1b | 1015 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1016 | { |
c69e8d9c | 1017 | const struct cred *cred; |
87729a55 | 1018 | |
c69e8d9c | 1019 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
1020 | return 1; |
1021 | ||
c2132c1b | 1022 | cred = current_cred(); |
499dcf20 EB |
1023 | if (uid_eq(cred->euid, fc->user_id) && |
1024 | uid_eq(cred->suid, fc->user_id) && | |
1025 | uid_eq(cred->uid, fc->user_id) && | |
1026 | gid_eq(cred->egid, fc->group_id) && | |
1027 | gid_eq(cred->sgid, fc->group_id) && | |
1028 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1029 | return 1; |
c69e8d9c | 1030 | |
c2132c1b | 1031 | return 0; |
87729a55 MS |
1032 | } |
1033 | ||
31d40d74 MS |
1034 | static int fuse_access(struct inode *inode, int mask) |
1035 | { | |
1036 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1037 | struct fuse_req *req; | |
1038 | struct fuse_access_in inarg; | |
1039 | int err; | |
1040 | ||
698fa1d1 MS |
1041 | BUG_ON(mask & MAY_NOT_BLOCK); |
1042 | ||
31d40d74 MS |
1043 | if (fc->no_access) |
1044 | return 0; | |
1045 | ||
b111c8c0 | 1046 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1047 | if (IS_ERR(req)) |
1048 | return PTR_ERR(req); | |
31d40d74 MS |
1049 | |
1050 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 1051 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
1052 | req->in.h.opcode = FUSE_ACCESS; |
1053 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
1054 | req->in.numargs = 1; |
1055 | req->in.args[0].size = sizeof(inarg); | |
1056 | req->in.args[0].value = &inarg; | |
b93f858a | 1057 | fuse_request_send(fc, req); |
31d40d74 MS |
1058 | err = req->out.h.error; |
1059 | fuse_put_request(fc, req); | |
1060 | if (err == -ENOSYS) { | |
1061 | fc->no_access = 1; | |
1062 | err = 0; | |
1063 | } | |
1064 | return err; | |
1065 | } | |
1066 | ||
10556cb2 | 1067 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1068 | { |
10556cb2 | 1069 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1070 | return -ECHILD; |
1071 | ||
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 | ||
1104 | if (fi->i_time < get_jiffies_64()) { | |
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 | { | |
1173 | int err; | |
1174 | struct fuse_entry_out *o = &direntplus->entry_out; | |
1175 | struct fuse_dirent *dirent = &direntplus->dirent; | |
1176 | struct dentry *parent = file->f_path.dentry; | |
1177 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); | |
1178 | struct dentry *dentry; | |
1179 | struct dentry *alias; | |
1180 | struct inode *dir = parent->d_inode; | |
1181 | struct fuse_conn *fc; | |
1182 | struct inode *inode; | |
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 | ||
1213 | name.hash = full_name_hash(name.name, name.len); | |
1214 | dentry = d_lookup(parent, &name); | |
53ce9a33 | 1215 | if (dentry) { |
0b05b183 | 1216 | inode = dentry->d_inode; |
53ce9a33 NV |
1217 | if (!inode) { |
1218 | d_drop(dentry); | |
a28ef45c MS |
1219 | } else if (get_node_id(inode) != o->nodeid || |
1220 | ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { | |
53ce9a33 NV |
1221 | err = d_invalidate(dentry); |
1222 | if (err) | |
1223 | goto out; | |
a28ef45c MS |
1224 | } else if (is_bad_inode(inode)) { |
1225 | err = -EIO; | |
1226 | goto out; | |
53ce9a33 | 1227 | } else { |
0b05b183 AA |
1228 | struct fuse_inode *fi; |
1229 | fi = get_fuse_inode(inode); | |
1230 | spin_lock(&fc->lock); | |
1231 | fi->nlookup++; | |
1232 | spin_unlock(&fc->lock); | |
1233 | ||
fa2b7213 MS |
1234 | fuse_change_attributes(inode, &o->attr, |
1235 | entry_attr_timeout(o), | |
1236 | attr_version); | |
1237 | ||
0b05b183 AA |
1238 | /* |
1239 | * The other branch to 'found' comes via fuse_iget() | |
1240 | * which bumps nlookup inside | |
1241 | */ | |
1242 | goto found; | |
1243 | } | |
0b05b183 | 1244 | dput(dentry); |
0b05b183 AA |
1245 | } |
1246 | ||
1247 | dentry = d_alloc(parent, &name); | |
1248 | err = -ENOMEM; | |
1249 | if (!dentry) | |
1250 | goto out; | |
1251 | ||
1252 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, | |
1253 | &o->attr, entry_attr_timeout(o), attr_version); | |
1254 | if (!inode) | |
1255 | goto out; | |
1256 | ||
b70a80e7 | 1257 | alias = d_materialise_unique(dentry, inode); |
5835f339 MS |
1258 | err = PTR_ERR(alias); |
1259 | if (IS_ERR(alias)) | |
1260 | goto out; | |
2914941e | 1261 | |
0b05b183 AA |
1262 | if (alias) { |
1263 | dput(dentry); | |
1264 | dentry = alias; | |
1265 | } | |
1266 | ||
1267 | found: | |
6314efee MS |
1268 | if (fc->readdirplus_auto) |
1269 | set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state); | |
0b05b183 AA |
1270 | fuse_change_entry_timeout(dentry, o); |
1271 | ||
1272 | err = 0; | |
1273 | out: | |
c7263bcd | 1274 | dput(dentry); |
0b05b183 AA |
1275 | return err; |
1276 | } | |
1277 | ||
1278 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1279 | struct dir_context *ctx, u64 attr_version) |
0b05b183 AA |
1280 | { |
1281 | struct fuse_direntplus *direntplus; | |
1282 | struct fuse_dirent *dirent; | |
1283 | size_t reclen; | |
1284 | int over = 0; | |
1285 | int ret; | |
1286 | ||
1287 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { | |
1288 | direntplus = (struct fuse_direntplus *) buf; | |
1289 | dirent = &direntplus->dirent; | |
1290 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); | |
1291 | ||
1292 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1293 | return -EIO; | |
1294 | if (reclen > nbytes) | |
1295 | break; | |
efeb9e60 MS |
1296 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1297 | return -EIO; | |
0b05b183 AA |
1298 | |
1299 | if (!over) { | |
1300 | /* We fill entries into dstbuf only as much as | |
1301 | it can hold. But we still continue iterating | |
1302 | over remaining entries to link them. If not, | |
1303 | we need to send a FORGET for each of those | |
1304 | which we did not link. | |
1305 | */ | |
8d3af7f3 AV |
1306 | over = !dir_emit(ctx, dirent->name, dirent->namelen, |
1307 | dirent->ino, dirent->type); | |
1308 | ctx->pos = dirent->off; | |
0b05b183 AA |
1309 | } |
1310 | ||
1311 | buf += reclen; | |
1312 | nbytes -= reclen; | |
1313 | ||
1314 | ret = fuse_direntplus_link(file, direntplus, attr_version); | |
1315 | if (ret) | |
1316 | fuse_force_forget(file, direntplus->entry_out.nodeid); | |
1317 | } | |
1318 | ||
1319 | return 0; | |
1320 | } | |
1321 | ||
8d3af7f3 | 1322 | static int fuse_readdir(struct file *file, struct dir_context *ctx) |
e5e5558e | 1323 | { |
4582a4ab | 1324 | int plus, err; |
04730fef MS |
1325 | size_t nbytes; |
1326 | struct page *page; | |
496ad9aa | 1327 | struct inode *inode = file_inode(file); |
e5e5558e | 1328 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 | 1329 | struct fuse_req *req; |
0b05b183 | 1330 | u64 attr_version = 0; |
248d86e8 MS |
1331 | |
1332 | if (is_bad_inode(inode)) | |
1333 | return -EIO; | |
1334 | ||
b111c8c0 | 1335 | req = fuse_get_req(fc, 1); |
ce1d5a49 MS |
1336 | if (IS_ERR(req)) |
1337 | return PTR_ERR(req); | |
e5e5558e | 1338 | |
04730fef MS |
1339 | page = alloc_page(GFP_KERNEL); |
1340 | if (!page) { | |
1341 | fuse_put_request(fc, req); | |
1342 | return -ENOMEM; | |
1343 | } | |
4582a4ab | 1344 | |
8d3af7f3 | 1345 | plus = fuse_use_readdirplus(inode, ctx); |
f4975c67 | 1346 | req->out.argpages = 1; |
04730fef MS |
1347 | req->num_pages = 1; |
1348 | req->pages[0] = page; | |
85f40aec | 1349 | req->page_descs[0].length = PAGE_SIZE; |
4582a4ab | 1350 | if (plus) { |
0b05b183 | 1351 | attr_version = fuse_get_attr_version(fc); |
8d3af7f3 | 1352 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1353 | FUSE_READDIRPLUS); |
1354 | } else { | |
8d3af7f3 | 1355 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1356 | FUSE_READDIR); |
1357 | } | |
b93f858a | 1358 | fuse_request_send(fc, req); |
361b1eb5 | 1359 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1360 | err = req->out.h.error; |
1361 | fuse_put_request(fc, req); | |
0b05b183 | 1362 | if (!err) { |
4582a4ab | 1363 | if (plus) { |
0b05b183 | 1364 | err = parse_dirplusfile(page_address(page), nbytes, |
8d3af7f3 | 1365 | file, ctx, |
0b05b183 AA |
1366 | attr_version); |
1367 | } else { | |
1368 | err = parse_dirfile(page_address(page), nbytes, file, | |
8d3af7f3 | 1369 | ctx); |
0b05b183 AA |
1370 | } |
1371 | } | |
e5e5558e | 1372 | |
04730fef | 1373 | __free_page(page); |
b36c31ba | 1374 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 1375 | return err; |
e5e5558e MS |
1376 | } |
1377 | ||
1378 | static char *read_link(struct dentry *dentry) | |
1379 | { | |
1380 | struct inode *inode = dentry->d_inode; | |
1381 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 1382 | struct fuse_req *req = fuse_get_req_nopages(fc); |
e5e5558e MS |
1383 | char *link; |
1384 | ||
ce1d5a49 | 1385 | if (IS_ERR(req)) |
e231c2ee | 1386 | return ERR_CAST(req); |
e5e5558e MS |
1387 | |
1388 | link = (char *) __get_free_page(GFP_KERNEL); | |
1389 | if (!link) { | |
1390 | link = ERR_PTR(-ENOMEM); | |
1391 | goto out; | |
1392 | } | |
1393 | req->in.h.opcode = FUSE_READLINK; | |
1394 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1395 | req->out.argvar = 1; |
1396 | req->out.numargs = 1; | |
1397 | req->out.args[0].size = PAGE_SIZE - 1; | |
1398 | req->out.args[0].value = link; | |
b93f858a | 1399 | fuse_request_send(fc, req); |
e5e5558e MS |
1400 | if (req->out.h.error) { |
1401 | free_page((unsigned long) link); | |
1402 | link = ERR_PTR(req->out.h.error); | |
1403 | } else | |
1404 | link[req->out.args[0].size] = '\0'; | |
1405 | out: | |
1406 | fuse_put_request(fc, req); | |
b36c31ba | 1407 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
1408 | return link; |
1409 | } | |
1410 | ||
1411 | static void free_link(char *link) | |
1412 | { | |
1413 | if (!IS_ERR(link)) | |
1414 | free_page((unsigned long) link); | |
1415 | } | |
1416 | ||
1417 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1418 | { | |
1419 | nd_set_link(nd, read_link(dentry)); | |
1420 | return NULL; | |
1421 | } | |
1422 | ||
1423 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1424 | { | |
1425 | free_link(nd_get_link(nd)); | |
1426 | } | |
1427 | ||
1428 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1429 | { | |
91fe96b4 | 1430 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1431 | } |
1432 | ||
1433 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1434 | { | |
8b0797a4 MS |
1435 | fuse_release_common(file, FUSE_RELEASEDIR); |
1436 | ||
1437 | return 0; | |
e5e5558e MS |
1438 | } |
1439 | ||
02c24a82 JB |
1440 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1441 | int datasync) | |
82547981 | 1442 | { |
02c24a82 | 1443 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1444 | } |
1445 | ||
b18da0c5 MS |
1446 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1447 | unsigned long arg) | |
1448 | { | |
1449 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1450 | ||
1451 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1452 | if (fc->minor < 18) | |
1453 | return -ENOTTY; | |
1454 | ||
1455 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1456 | } | |
1457 | ||
1458 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1459 | unsigned long arg) | |
1460 | { | |
1461 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1462 | ||
1463 | if (fc->minor < 18) | |
1464 | return -ENOTTY; | |
1465 | ||
1466 | return fuse_ioctl_common(file, cmd, arg, | |
1467 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1468 | } | |
1469 | ||
17637cba MS |
1470 | static bool update_mtime(unsigned ivalid) |
1471 | { | |
1472 | /* Always update if mtime is explicitly set */ | |
1473 | if (ivalid & ATTR_MTIME_SET) | |
1474 | return true; | |
1475 | ||
1476 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ | |
1477 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1478 | return false; | |
1479 | ||
1480 | /* In all other cases update */ | |
1481 | return true; | |
1482 | } | |
1483 | ||
befc649c | 1484 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
1485 | { |
1486 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1487 | |
1488 | if (ivalid & ATTR_MODE) | |
befc649c | 1489 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1490 | if (ivalid & ATTR_UID) |
499dcf20 | 1491 | arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid); |
9e6268db | 1492 | if (ivalid & ATTR_GID) |
499dcf20 | 1493 | arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid); |
9e6268db | 1494 | if (ivalid & ATTR_SIZE) |
befc649c | 1495 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1496 | if (ivalid & ATTR_ATIME) { |
1497 | arg->valid |= FATTR_ATIME; | |
befc649c | 1498 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1499 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1500 | if (!(ivalid & ATTR_ATIME_SET)) | |
1501 | arg->valid |= FATTR_ATIME_NOW; | |
1502 | } | |
1503 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) { | |
1504 | arg->valid |= FATTR_MTIME; | |
befc649c | 1505 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba MS |
1506 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
1507 | if (!(ivalid & ATTR_MTIME_SET)) | |
1508 | arg->valid |= FATTR_MTIME_NOW; | |
befc649c | 1509 | } |
9e6268db MS |
1510 | } |
1511 | ||
3be5a52b MS |
1512 | /* |
1513 | * Prevent concurrent writepages on inode | |
1514 | * | |
1515 | * This is done by adding a negative bias to the inode write counter | |
1516 | * and waiting for all pending writes to finish. | |
1517 | */ | |
1518 | void fuse_set_nowrite(struct inode *inode) | |
1519 | { | |
1520 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1521 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1522 | ||
1523 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1524 | ||
1525 | spin_lock(&fc->lock); | |
1526 | BUG_ON(fi->writectr < 0); | |
1527 | fi->writectr += FUSE_NOWRITE; | |
1528 | spin_unlock(&fc->lock); | |
1529 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1530 | } | |
1531 | ||
1532 | /* | |
1533 | * Allow writepages on inode | |
1534 | * | |
1535 | * Remove the bias from the writecounter and send any queued | |
1536 | * writepages. | |
1537 | */ | |
1538 | static void __fuse_release_nowrite(struct inode *inode) | |
1539 | { | |
1540 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1541 | ||
1542 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1543 | fi->writectr = 0; | |
1544 | fuse_flush_writepages(inode); | |
1545 | } | |
1546 | ||
1547 | void fuse_release_nowrite(struct inode *inode) | |
1548 | { | |
1549 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1550 | ||
1551 | spin_lock(&fc->lock); | |
1552 | __fuse_release_nowrite(inode); | |
1553 | spin_unlock(&fc->lock); | |
1554 | } | |
1555 | ||
6f9f1180 MS |
1556 | /* |
1557 | * Set attributes, and at the same time refresh them. | |
1558 | * | |
1559 | * Truncation is slightly complicated, because the 'truncate' request | |
1560 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1561 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1562 | * and the actual truncation by hand. | |
6f9f1180 | 1563 | */ |
efb9fa9e MP |
1564 | int fuse_do_setattr(struct inode *inode, struct iattr *attr, |
1565 | struct file *file) | |
9e6268db | 1566 | { |
9e6268db | 1567 | struct fuse_conn *fc = get_fuse_conn(inode); |
06a7c3c2 | 1568 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db MS |
1569 | struct fuse_req *req; |
1570 | struct fuse_setattr_in inarg; | |
1571 | struct fuse_attr_out outarg; | |
3be5a52b MS |
1572 | bool is_truncate = false; |
1573 | loff_t oldsize; | |
9e6268db | 1574 | int err; |
9e6268db | 1575 | |
db78b877 CH |
1576 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1577 | attr->ia_valid |= ATTR_FORCE; | |
1578 | ||
1579 | err = inode_change_ok(inode, attr); | |
1580 | if (err) | |
1581 | return err; | |
1e9a4ed9 | 1582 | |
8d56addd MS |
1583 | if (attr->ia_valid & ATTR_OPEN) { |
1584 | if (fc->atomic_o_trunc) | |
1585 | return 0; | |
1586 | file = NULL; | |
1587 | } | |
6ff958ed | 1588 | |
2c27c65e | 1589 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1590 | is_truncate = true; |
9e6268db | 1591 | |
b111c8c0 | 1592 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1593 | if (IS_ERR(req)) |
1594 | return PTR_ERR(req); | |
9e6268db | 1595 | |
06a7c3c2 | 1596 | if (is_truncate) { |
3be5a52b | 1597 | fuse_set_nowrite(inode); |
06a7c3c2 MP |
1598 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
1599 | } | |
3be5a52b | 1600 | |
9e6268db | 1601 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1602 | memset(&outarg, 0, sizeof(outarg)); |
befc649c | 1603 | iattr_to_fattr(attr, &inarg); |
49d4914f MS |
1604 | if (file) { |
1605 | struct fuse_file *ff = file->private_data; | |
1606 | inarg.valid |= FATTR_FH; | |
1607 | inarg.fh = ff->fh; | |
1608 | } | |
f3332114 MS |
1609 | if (attr->ia_valid & ATTR_SIZE) { |
1610 | /* For mandatory locking in truncate */ | |
1611 | inarg.valid |= FATTR_LOCKOWNER; | |
1612 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1613 | } | |
9e6268db MS |
1614 | req->in.h.opcode = FUSE_SETATTR; |
1615 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1616 | req->in.numargs = 1; |
1617 | req->in.args[0].size = sizeof(inarg); | |
1618 | req->in.args[0].value = &inarg; | |
1619 | req->out.numargs = 1; | |
0e9663ee MS |
1620 | if (fc->minor < 9) |
1621 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1622 | else | |
1623 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 1624 | req->out.args[0].value = &outarg; |
b93f858a | 1625 | fuse_request_send(fc, req); |
9e6268db MS |
1626 | err = req->out.h.error; |
1627 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1628 | if (err) { |
1629 | if (err == -EINTR) | |
1630 | fuse_invalidate_attr(inode); | |
3be5a52b | 1631 | goto error; |
e00d2c2d | 1632 | } |
9e6268db | 1633 | |
e00d2c2d MS |
1634 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1635 | make_bad_inode(inode); | |
3be5a52b MS |
1636 | err = -EIO; |
1637 | goto error; | |
1638 | } | |
1639 | ||
1640 | spin_lock(&fc->lock); | |
1641 | fuse_change_attributes_common(inode, &outarg.attr, | |
1642 | attr_timeout(&outarg)); | |
1643 | oldsize = inode->i_size; | |
1644 | i_size_write(inode, outarg.attr.size); | |
1645 | ||
1646 | if (is_truncate) { | |
1647 | /* NOTE: this may release/reacquire fc->lock */ | |
1648 | __fuse_release_nowrite(inode); | |
1649 | } | |
1650 | spin_unlock(&fc->lock); | |
1651 | ||
1652 | /* | |
1653 | * Only call invalidate_inode_pages2() after removing | |
1654 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1655 | */ | |
1656 | if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1657 | truncate_pagecache(inode, outarg.attr.size); |
3be5a52b | 1658 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1659 | } |
1660 | ||
06a7c3c2 | 1661 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
e00d2c2d | 1662 | return 0; |
3be5a52b MS |
1663 | |
1664 | error: | |
1665 | if (is_truncate) | |
1666 | fuse_release_nowrite(inode); | |
1667 | ||
06a7c3c2 | 1668 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3be5a52b | 1669 | return err; |
9e6268db MS |
1670 | } |
1671 | ||
49d4914f MS |
1672 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1673 | { | |
efb9fa9e MP |
1674 | struct inode *inode = entry->d_inode; |
1675 | ||
1676 | if (!fuse_allow_current_process(get_fuse_conn(inode))) | |
1677 | return -EACCES; | |
1678 | ||
49d4914f | 1679 | if (attr->ia_valid & ATTR_FILE) |
efb9fa9e | 1680 | return fuse_do_setattr(inode, attr, attr->ia_file); |
49d4914f | 1681 | else |
efb9fa9e | 1682 | return fuse_do_setattr(inode, attr, NULL); |
49d4914f MS |
1683 | } |
1684 | ||
e5e5558e MS |
1685 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1686 | struct kstat *stat) | |
1687 | { | |
1688 | struct inode *inode = entry->d_inode; | |
244f6385 | 1689 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1690 | |
c2132c1b | 1691 | if (!fuse_allow_current_process(fc)) |
244f6385 MS |
1692 | return -EACCES; |
1693 | ||
bcb4be80 | 1694 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1695 | } |
1696 | ||
92a8780e MS |
1697 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1698 | const void *value, size_t size, int flags) | |
1699 | { | |
1700 | struct inode *inode = entry->d_inode; | |
1701 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1702 | struct fuse_req *req; | |
1703 | struct fuse_setxattr_in inarg; | |
1704 | int err; | |
1705 | ||
92a8780e MS |
1706 | if (fc->no_setxattr) |
1707 | return -EOPNOTSUPP; | |
1708 | ||
b111c8c0 | 1709 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1710 | if (IS_ERR(req)) |
1711 | return PTR_ERR(req); | |
92a8780e MS |
1712 | |
1713 | memset(&inarg, 0, sizeof(inarg)); | |
1714 | inarg.size = size; | |
1715 | inarg.flags = flags; | |
1716 | req->in.h.opcode = FUSE_SETXATTR; | |
1717 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1718 | req->in.numargs = 3; |
1719 | req->in.args[0].size = sizeof(inarg); | |
1720 | req->in.args[0].value = &inarg; | |
1721 | req->in.args[1].size = strlen(name) + 1; | |
1722 | req->in.args[1].value = name; | |
1723 | req->in.args[2].size = size; | |
1724 | req->in.args[2].value = value; | |
b93f858a | 1725 | fuse_request_send(fc, req); |
92a8780e MS |
1726 | err = req->out.h.error; |
1727 | fuse_put_request(fc, req); | |
1728 | if (err == -ENOSYS) { | |
1729 | fc->no_setxattr = 1; | |
1730 | err = -EOPNOTSUPP; | |
1731 | } | |
d331a415 AA |
1732 | if (!err) |
1733 | fuse_invalidate_attr(inode); | |
92a8780e MS |
1734 | return err; |
1735 | } | |
1736 | ||
1737 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1738 | void *value, size_t size) | |
1739 | { | |
1740 | struct inode *inode = entry->d_inode; | |
1741 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1742 | struct fuse_req *req; | |
1743 | struct fuse_getxattr_in inarg; | |
1744 | struct fuse_getxattr_out outarg; | |
1745 | ssize_t ret; | |
1746 | ||
1747 | if (fc->no_getxattr) | |
1748 | return -EOPNOTSUPP; | |
1749 | ||
b111c8c0 | 1750 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1751 | if (IS_ERR(req)) |
1752 | return PTR_ERR(req); | |
92a8780e MS |
1753 | |
1754 | memset(&inarg, 0, sizeof(inarg)); | |
1755 | inarg.size = size; | |
1756 | req->in.h.opcode = FUSE_GETXATTR; | |
1757 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1758 | req->in.numargs = 2; |
1759 | req->in.args[0].size = sizeof(inarg); | |
1760 | req->in.args[0].value = &inarg; | |
1761 | req->in.args[1].size = strlen(name) + 1; | |
1762 | req->in.args[1].value = name; | |
1763 | /* This is really two different operations rolled into one */ | |
1764 | req->out.numargs = 1; | |
1765 | if (size) { | |
1766 | req->out.argvar = 1; | |
1767 | req->out.args[0].size = size; | |
1768 | req->out.args[0].value = value; | |
1769 | } else { | |
1770 | req->out.args[0].size = sizeof(outarg); | |
1771 | req->out.args[0].value = &outarg; | |
1772 | } | |
b93f858a | 1773 | fuse_request_send(fc, req); |
92a8780e MS |
1774 | ret = req->out.h.error; |
1775 | if (!ret) | |
1776 | ret = size ? req->out.args[0].size : outarg.size; | |
1777 | else { | |
1778 | if (ret == -ENOSYS) { | |
1779 | fc->no_getxattr = 1; | |
1780 | ret = -EOPNOTSUPP; | |
1781 | } | |
1782 | } | |
1783 | fuse_put_request(fc, req); | |
1784 | return ret; | |
1785 | } | |
1786 | ||
1787 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1788 | { | |
1789 | struct inode *inode = entry->d_inode; | |
1790 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1791 | struct fuse_req *req; | |
1792 | struct fuse_getxattr_in inarg; | |
1793 | struct fuse_getxattr_out outarg; | |
1794 | ssize_t ret; | |
1795 | ||
c2132c1b | 1796 | if (!fuse_allow_current_process(fc)) |
e57ac683 MS |
1797 | return -EACCES; |
1798 | ||
92a8780e MS |
1799 | if (fc->no_listxattr) |
1800 | return -EOPNOTSUPP; | |
1801 | ||
b111c8c0 | 1802 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1803 | if (IS_ERR(req)) |
1804 | return PTR_ERR(req); | |
92a8780e MS |
1805 | |
1806 | memset(&inarg, 0, sizeof(inarg)); | |
1807 | inarg.size = size; | |
1808 | req->in.h.opcode = FUSE_LISTXATTR; | |
1809 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1810 | req->in.numargs = 1; |
1811 | req->in.args[0].size = sizeof(inarg); | |
1812 | req->in.args[0].value = &inarg; | |
1813 | /* This is really two different operations rolled into one */ | |
1814 | req->out.numargs = 1; | |
1815 | if (size) { | |
1816 | req->out.argvar = 1; | |
1817 | req->out.args[0].size = size; | |
1818 | req->out.args[0].value = list; | |
1819 | } else { | |
1820 | req->out.args[0].size = sizeof(outarg); | |
1821 | req->out.args[0].value = &outarg; | |
1822 | } | |
b93f858a | 1823 | fuse_request_send(fc, req); |
92a8780e MS |
1824 | ret = req->out.h.error; |
1825 | if (!ret) | |
1826 | ret = size ? req->out.args[0].size : outarg.size; | |
1827 | else { | |
1828 | if (ret == -ENOSYS) { | |
1829 | fc->no_listxattr = 1; | |
1830 | ret = -EOPNOTSUPP; | |
1831 | } | |
1832 | } | |
1833 | fuse_put_request(fc, req); | |
1834 | return ret; | |
1835 | } | |
1836 | ||
1837 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1838 | { | |
1839 | struct inode *inode = entry->d_inode; | |
1840 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1841 | struct fuse_req *req; | |
1842 | int err; | |
1843 | ||
1844 | if (fc->no_removexattr) | |
1845 | return -EOPNOTSUPP; | |
1846 | ||
b111c8c0 | 1847 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1848 | if (IS_ERR(req)) |
1849 | return PTR_ERR(req); | |
92a8780e MS |
1850 | |
1851 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1852 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1853 | req->in.numargs = 1; |
1854 | req->in.args[0].size = strlen(name) + 1; | |
1855 | req->in.args[0].value = name; | |
b93f858a | 1856 | fuse_request_send(fc, req); |
92a8780e MS |
1857 | err = req->out.h.error; |
1858 | fuse_put_request(fc, req); | |
1859 | if (err == -ENOSYS) { | |
1860 | fc->no_removexattr = 1; | |
1861 | err = -EOPNOTSUPP; | |
1862 | } | |
d331a415 AA |
1863 | if (!err) |
1864 | fuse_invalidate_attr(inode); | |
92a8780e MS |
1865 | return err; |
1866 | } | |
1867 | ||
754661f1 | 1868 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1869 | .lookup = fuse_lookup, |
9e6268db MS |
1870 | .mkdir = fuse_mkdir, |
1871 | .symlink = fuse_symlink, | |
1872 | .unlink = fuse_unlink, | |
1873 | .rmdir = fuse_rmdir, | |
1874 | .rename = fuse_rename, | |
1875 | .link = fuse_link, | |
1876 | .setattr = fuse_setattr, | |
1877 | .create = fuse_create, | |
c8ccbe03 | 1878 | .atomic_open = fuse_atomic_open, |
9e6268db | 1879 | .mknod = fuse_mknod, |
e5e5558e MS |
1880 | .permission = fuse_permission, |
1881 | .getattr = fuse_getattr, | |
92a8780e MS |
1882 | .setxattr = fuse_setxattr, |
1883 | .getxattr = fuse_getxattr, | |
1884 | .listxattr = fuse_listxattr, | |
1885 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1886 | }; |
1887 | ||
4b6f5d20 | 1888 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1889 | .llseek = generic_file_llseek, |
e5e5558e | 1890 | .read = generic_read_dir, |
8d3af7f3 | 1891 | .iterate = fuse_readdir, |
e5e5558e MS |
1892 | .open = fuse_dir_open, |
1893 | .release = fuse_dir_release, | |
82547981 | 1894 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1895 | .unlocked_ioctl = fuse_dir_ioctl, |
1896 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1897 | }; |
1898 | ||
754661f1 | 1899 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1900 | .setattr = fuse_setattr, |
e5e5558e MS |
1901 | .permission = fuse_permission, |
1902 | .getattr = fuse_getattr, | |
92a8780e MS |
1903 | .setxattr = fuse_setxattr, |
1904 | .getxattr = fuse_getxattr, | |
1905 | .listxattr = fuse_listxattr, | |
1906 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1907 | }; |
1908 | ||
754661f1 | 1909 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1910 | .setattr = fuse_setattr, |
e5e5558e MS |
1911 | .follow_link = fuse_follow_link, |
1912 | .put_link = fuse_put_link, | |
1913 | .readlink = generic_readlink, | |
1914 | .getattr = fuse_getattr, | |
92a8780e MS |
1915 | .setxattr = fuse_setxattr, |
1916 | .getxattr = fuse_getxattr, | |
1917 | .listxattr = fuse_listxattr, | |
1918 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1919 | }; |
1920 | ||
1921 | void fuse_init_common(struct inode *inode) | |
1922 | { | |
1923 | inode->i_op = &fuse_common_inode_operations; | |
1924 | } | |
1925 | ||
1926 | void fuse_init_dir(struct inode *inode) | |
1927 | { | |
1928 | inode->i_op = &fuse_dir_inode_operations; | |
1929 | inode->i_fop = &fuse_dir_operations; | |
1930 | } | |
1931 | ||
1932 | void fuse_init_symlink(struct inode *inode) | |
1933 | { | |
1934 | inode->i_op = &fuse_symlink_inode_operations; | |
1935 | } |