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 | |
4582a4ab FS |
17 | static bool fuse_use_readdirplus(struct inode *dir, struct file *filp) |
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; | |
28 | if (filp->f_pos == 0) | |
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; |
8cbdf1e6 | 183 | |
e7c0a167 | 184 | inode = ACCESS_ONCE(entry->d_inode); |
8cbdf1e6 | 185 | if (inode && is_bad_inode(inode)) |
e5e5558e | 186 | return 0; |
0a0898cf | 187 | else if (fuse_dentry_time(entry) < get_jiffies_64()) { |
e5e5558e | 188 | int err; |
e5e5558e | 189 | struct fuse_entry_out outarg; |
8cbdf1e6 MS |
190 | struct fuse_conn *fc; |
191 | struct fuse_req *req; | |
07e77dca | 192 | struct fuse_forget_link *forget; |
e956edd0 | 193 | struct dentry *parent; |
1fb69e78 | 194 | u64 attr_version; |
8cbdf1e6 | 195 | |
50322fe7 | 196 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 MS |
197 | if (!inode) |
198 | return 0; | |
199 | ||
0b728e19 | 200 | if (flags & LOOKUP_RCU) |
e7c0a167 MS |
201 | return -ECHILD; |
202 | ||
8cbdf1e6 | 203 | fc = get_fuse_conn(inode); |
b111c8c0 | 204 | req = fuse_get_req_nopages(fc); |
ce1d5a49 | 205 | if (IS_ERR(req)) |
e5e5558e MS |
206 | return 0; |
207 | ||
07e77dca MS |
208 | forget = fuse_alloc_forget(); |
209 | if (!forget) { | |
2d51013e MS |
210 | fuse_put_request(fc, req); |
211 | return 0; | |
212 | } | |
213 | ||
7dca9fd3 | 214 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 215 | |
e956edd0 | 216 | parent = dget_parent(entry); |
c180eebe MS |
217 | fuse_lookup_init(fc, req, get_node_id(parent->d_inode), |
218 | &entry->d_name, &outarg); | |
b93f858a | 219 | fuse_request_send(fc, req); |
e956edd0 | 220 | dput(parent); |
e5e5558e | 221 | err = req->out.h.error; |
2d51013e | 222 | fuse_put_request(fc, req); |
50322fe7 MS |
223 | /* Zero nodeid is same as -ENOENT */ |
224 | if (!err && !outarg.nodeid) | |
225 | err = -ENOENT; | |
9e6268db | 226 | if (!err) { |
8cbdf1e6 | 227 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 228 | if (outarg.nodeid != get_node_id(inode)) { |
07e77dca | 229 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
230 | return 0; |
231 | } | |
8da5ff23 | 232 | spin_lock(&fc->lock); |
1729a16c | 233 | fi->nlookup++; |
8da5ff23 | 234 | spin_unlock(&fc->lock); |
9e6268db | 235 | } |
07e77dca | 236 | kfree(forget); |
9e6268db | 237 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
238 | return 0; |
239 | ||
1fb69e78 MS |
240 | fuse_change_attributes(inode, &outarg.attr, |
241 | entry_attr_timeout(&outarg), | |
242 | attr_version); | |
243 | fuse_change_entry_timeout(entry, &outarg); | |
e5e5558e | 244 | } |
4582a4ab | 245 | fuse_advise_use_readdirplus(inode); |
e5e5558e MS |
246 | return 1; |
247 | } | |
248 | ||
8bfc016d | 249 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
250 | { |
251 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
252 | } | |
253 | ||
4269590a | 254 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e MS |
255 | .d_revalidate = fuse_dentry_revalidate, |
256 | }; | |
257 | ||
a5bfffac | 258 | int fuse_valid_type(int m) |
39ee059a MS |
259 | { |
260 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
261 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
262 | } | |
263 | ||
d2a85164 MS |
264 | /* |
265 | * Add a directory inode to a dentry, ensuring that no other dentry | |
266 | * refers to this inode. Called with fc->inst_mutex. | |
267 | */ | |
0de6256d MS |
268 | static struct dentry *fuse_d_add_directory(struct dentry *entry, |
269 | struct inode *inode) | |
d2a85164 MS |
270 | { |
271 | struct dentry *alias = d_find_alias(inode); | |
0de6256d | 272 | if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) { |
d2a85164 MS |
273 | /* This tries to shrink the subtree below alias */ |
274 | fuse_invalidate_entry(alias); | |
275 | dput(alias); | |
b3d9b7a3 | 276 | if (!hlist_empty(&inode->i_dentry)) |
0de6256d MS |
277 | return ERR_PTR(-EBUSY); |
278 | } else { | |
279 | dput(alias); | |
d2a85164 | 280 | } |
0de6256d | 281 | return d_splice_alias(inode, entry); |
d2a85164 MS |
282 | } |
283 | ||
c180eebe MS |
284 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, |
285 | struct fuse_entry_out *outarg, struct inode **inode) | |
e5e5558e | 286 | { |
c180eebe | 287 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
e5e5558e | 288 | struct fuse_req *req; |
07e77dca | 289 | struct fuse_forget_link *forget; |
1fb69e78 | 290 | u64 attr_version; |
c180eebe | 291 | int err; |
e5e5558e | 292 | |
c180eebe MS |
293 | *inode = NULL; |
294 | err = -ENAMETOOLONG; | |
295 | if (name->len > FUSE_NAME_MAX) | |
296 | goto out; | |
e5e5558e | 297 | |
b111c8c0 | 298 | req = fuse_get_req_nopages(fc); |
c180eebe | 299 | err = PTR_ERR(req); |
ce1d5a49 | 300 | if (IS_ERR(req)) |
c180eebe | 301 | goto out; |
e5e5558e | 302 | |
07e77dca MS |
303 | forget = fuse_alloc_forget(); |
304 | err = -ENOMEM; | |
305 | if (!forget) { | |
2d51013e | 306 | fuse_put_request(fc, req); |
c180eebe | 307 | goto out; |
2d51013e MS |
308 | } |
309 | ||
7dca9fd3 | 310 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 311 | |
c180eebe | 312 | fuse_lookup_init(fc, req, nodeid, name, outarg); |
b93f858a | 313 | fuse_request_send(fc, req); |
e5e5558e | 314 | err = req->out.h.error; |
2d51013e | 315 | fuse_put_request(fc, req); |
50322fe7 | 316 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
317 | if (err || !outarg->nodeid) |
318 | goto out_put_forget; | |
319 | ||
320 | err = -EIO; | |
321 | if (!outarg->nodeid) | |
322 | goto out_put_forget; | |
323 | if (!fuse_valid_type(outarg->attr.mode)) | |
324 | goto out_put_forget; | |
325 | ||
326 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
327 | &outarg->attr, entry_attr_timeout(outarg), | |
328 | attr_version); | |
329 | err = -ENOMEM; | |
330 | if (!*inode) { | |
07e77dca | 331 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
c180eebe | 332 | goto out; |
e5e5558e | 333 | } |
c180eebe MS |
334 | err = 0; |
335 | ||
336 | out_put_forget: | |
07e77dca | 337 | kfree(forget); |
c180eebe MS |
338 | out: |
339 | return err; | |
340 | } | |
341 | ||
342 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 343 | unsigned int flags) |
c180eebe MS |
344 | { |
345 | int err; | |
346 | struct fuse_entry_out outarg; | |
347 | struct inode *inode; | |
348 | struct dentry *newent; | |
349 | struct fuse_conn *fc = get_fuse_conn(dir); | |
350 | bool outarg_valid = true; | |
351 | ||
352 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, | |
353 | &outarg, &inode); | |
354 | if (err == -ENOENT) { | |
355 | outarg_valid = false; | |
356 | err = 0; | |
357 | } | |
358 | if (err) | |
359 | goto out_err; | |
360 | ||
361 | err = -EIO; | |
362 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
363 | goto out_iput; | |
e5e5558e | 364 | |
d2a85164 MS |
365 | if (inode && S_ISDIR(inode->i_mode)) { |
366 | mutex_lock(&fc->inst_mutex); | |
0de6256d | 367 | newent = fuse_d_add_directory(entry, inode); |
d2a85164 | 368 | mutex_unlock(&fc->inst_mutex); |
c180eebe MS |
369 | err = PTR_ERR(newent); |
370 | if (IS_ERR(newent)) | |
371 | goto out_iput; | |
372 | } else { | |
0de6256d | 373 | newent = d_splice_alias(inode, entry); |
c180eebe | 374 | } |
d2a85164 | 375 | |
0de6256d | 376 | entry = newent ? newent : entry; |
c180eebe | 377 | if (outarg_valid) |
1fb69e78 | 378 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
379 | else |
380 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 381 | |
4582a4ab | 382 | fuse_advise_use_readdirplus(dir); |
0de6256d | 383 | return newent; |
c180eebe MS |
384 | |
385 | out_iput: | |
386 | iput(inode); | |
387 | out_err: | |
388 | return ERR_PTR(err); | |
e5e5558e MS |
389 | } |
390 | ||
6f9f1180 MS |
391 | /* |
392 | * Atomic create+open operation | |
393 | * | |
394 | * If the filesystem doesn't support this, then fall back to separate | |
395 | * 'mknod' + 'open' requests. | |
396 | */ | |
d9585277 | 397 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 398 | struct file *file, unsigned flags, |
d9585277 | 399 | umode_t mode, int *opened) |
fd72faac MS |
400 | { |
401 | int err; | |
402 | struct inode *inode; | |
403 | struct fuse_conn *fc = get_fuse_conn(dir); | |
404 | struct fuse_req *req; | |
07e77dca | 405 | struct fuse_forget_link *forget; |
e0a43ddc | 406 | struct fuse_create_in inarg; |
fd72faac MS |
407 | struct fuse_open_out outopen; |
408 | struct fuse_entry_out outentry; | |
fd72faac | 409 | struct fuse_file *ff; |
fd72faac | 410 | |
af109bca MS |
411 | /* Userspace expects S_IFREG in create mode */ |
412 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
413 | ||
07e77dca | 414 | forget = fuse_alloc_forget(); |
c8ccbe03 | 415 | err = -ENOMEM; |
07e77dca | 416 | if (!forget) |
c8ccbe03 | 417 | goto out_err; |
51eb01e7 | 418 | |
b111c8c0 | 419 | req = fuse_get_req_nopages(fc); |
51eb01e7 | 420 | err = PTR_ERR(req); |
ce1d5a49 | 421 | if (IS_ERR(req)) |
51eb01e7 | 422 | goto out_put_forget_req; |
fd72faac | 423 | |
ce1d5a49 | 424 | err = -ENOMEM; |
acf99433 | 425 | ff = fuse_file_alloc(fc); |
fd72faac MS |
426 | if (!ff) |
427 | goto out_put_request; | |
428 | ||
e0a43ddc MS |
429 | if (!fc->dont_mask) |
430 | mode &= ~current_umask(); | |
431 | ||
fd72faac MS |
432 | flags &= ~O_NOCTTY; |
433 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 434 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
435 | inarg.flags = flags; |
436 | inarg.mode = mode; | |
e0a43ddc | 437 | inarg.umask = current_umask(); |
fd72faac MS |
438 | req->in.h.opcode = FUSE_CREATE; |
439 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac | 440 | req->in.numargs = 2; |
e0a43ddc MS |
441 | req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : |
442 | sizeof(inarg); | |
fd72faac MS |
443 | req->in.args[0].value = &inarg; |
444 | req->in.args[1].size = entry->d_name.len + 1; | |
445 | req->in.args[1].value = entry->d_name.name; | |
446 | req->out.numargs = 2; | |
0e9663ee MS |
447 | if (fc->minor < 9) |
448 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
449 | else | |
450 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
451 | req->out.args[0].value = &outentry; |
452 | req->out.args[1].size = sizeof(outopen); | |
453 | req->out.args[1].value = &outopen; | |
b93f858a | 454 | fuse_request_send(fc, req); |
fd72faac | 455 | err = req->out.h.error; |
c8ccbe03 | 456 | if (err) |
fd72faac | 457 | goto out_free_ff; |
fd72faac MS |
458 | |
459 | err = -EIO; | |
2827d0b2 | 460 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
461 | goto out_free_ff; |
462 | ||
51eb01e7 | 463 | fuse_put_request(fc, req); |
c7b7143c MS |
464 | ff->fh = outopen.fh; |
465 | ff->nodeid = outentry.nodeid; | |
466 | ff->open_flags = outopen.open_flags; | |
fd72faac | 467 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 468 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
469 | if (!inode) { |
470 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 471 | fuse_sync_release(ff, flags); |
07e77dca | 472 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
473 | err = -ENOMEM; |
474 | goto out_err; | |
fd72faac | 475 | } |
07e77dca | 476 | kfree(forget); |
fd72faac | 477 | d_instantiate(entry, inode); |
1fb69e78 | 478 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 479 | fuse_invalidate_attr(dir); |
30d90494 AV |
480 | err = finish_open(file, entry, generic_file_open, opened); |
481 | if (err) { | |
8b0797a4 | 482 | fuse_sync_release(ff, flags); |
c8ccbe03 MS |
483 | } else { |
484 | file->private_data = fuse_file_get(ff); | |
485 | fuse_finish_open(inode, file); | |
fd72faac | 486 | } |
d9585277 | 487 | return err; |
fd72faac | 488 | |
c8ccbe03 | 489 | out_free_ff: |
fd72faac | 490 | fuse_file_free(ff); |
c8ccbe03 | 491 | out_put_request: |
fd72faac | 492 | fuse_put_request(fc, req); |
c8ccbe03 | 493 | out_put_forget_req: |
07e77dca | 494 | kfree(forget); |
c8ccbe03 | 495 | out_err: |
d9585277 | 496 | return err; |
c8ccbe03 MS |
497 | } |
498 | ||
499 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 500 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 501 | struct file *file, unsigned flags, |
d9585277 | 502 | umode_t mode, int *opened) |
c8ccbe03 MS |
503 | { |
504 | int err; | |
505 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
506 | struct dentry *res = NULL; |
507 | ||
508 | if (d_unhashed(entry)) { | |
00cd8dd3 | 509 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 510 | if (IS_ERR(res)) |
d9585277 | 511 | return PTR_ERR(res); |
c8ccbe03 MS |
512 | |
513 | if (res) | |
514 | entry = res; | |
515 | } | |
516 | ||
517 | if (!(flags & O_CREAT) || entry->d_inode) | |
518 | goto no_open; | |
519 | ||
520 | /* Only creates */ | |
47237687 | 521 | *opened |= FILE_CREATED; |
c8ccbe03 MS |
522 | |
523 | if (fc->no_create) | |
524 | goto mknod; | |
525 | ||
30d90494 | 526 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
d9585277 | 527 | if (err == -ENOSYS) { |
c8ccbe03 MS |
528 | fc->no_create = 1; |
529 | goto mknod; | |
530 | } | |
531 | out_dput: | |
532 | dput(res); | |
d9585277 | 533 | return err; |
c8ccbe03 MS |
534 | |
535 | mknod: | |
536 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 537 | if (err) |
c8ccbe03 | 538 | goto out_dput; |
c8ccbe03 | 539 | no_open: |
e45198a6 | 540 | return finish_no_open(file, res); |
fd72faac MS |
541 | } |
542 | ||
6f9f1180 MS |
543 | /* |
544 | * Code shared between mknod, mkdir, symlink and link | |
545 | */ | |
9e6268db MS |
546 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
547 | struct inode *dir, struct dentry *entry, | |
541af6a0 | 548 | umode_t mode) |
9e6268db MS |
549 | { |
550 | struct fuse_entry_out outarg; | |
551 | struct inode *inode; | |
9e6268db | 552 | int err; |
07e77dca | 553 | struct fuse_forget_link *forget; |
2d51013e | 554 | |
07e77dca MS |
555 | forget = fuse_alloc_forget(); |
556 | if (!forget) { | |
2d51013e | 557 | fuse_put_request(fc, req); |
07e77dca | 558 | return -ENOMEM; |
2d51013e | 559 | } |
9e6268db | 560 | |
0e9663ee | 561 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 562 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 563 | req->out.numargs = 1; |
0e9663ee MS |
564 | if (fc->minor < 9) |
565 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
566 | else | |
567 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 568 | req->out.args[0].value = &outarg; |
b93f858a | 569 | fuse_request_send(fc, req); |
9e6268db | 570 | err = req->out.h.error; |
2d51013e MS |
571 | fuse_put_request(fc, req); |
572 | if (err) | |
573 | goto out_put_forget_req; | |
574 | ||
39ee059a MS |
575 | err = -EIO; |
576 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 577 | goto out_put_forget_req; |
39ee059a MS |
578 | |
579 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 580 | goto out_put_forget_req; |
39ee059a | 581 | |
9e6268db | 582 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 583 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 584 | if (!inode) { |
07e77dca | 585 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
586 | return -ENOMEM; |
587 | } | |
07e77dca | 588 | kfree(forget); |
9e6268db | 589 | |
d2a85164 MS |
590 | if (S_ISDIR(inode->i_mode)) { |
591 | struct dentry *alias; | |
592 | mutex_lock(&fc->inst_mutex); | |
593 | alias = d_find_alias(inode); | |
594 | if (alias) { | |
595 | /* New directory must have moved since mkdir */ | |
596 | mutex_unlock(&fc->inst_mutex); | |
597 | dput(alias); | |
598 | iput(inode); | |
599 | return -EBUSY; | |
600 | } | |
601 | d_instantiate(entry, inode); | |
602 | mutex_unlock(&fc->inst_mutex); | |
603 | } else | |
604 | d_instantiate(entry, inode); | |
9e6268db | 605 | |
1fb69e78 | 606 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
607 | fuse_invalidate_attr(dir); |
608 | return 0; | |
39ee059a | 609 | |
2d51013e | 610 | out_put_forget_req: |
07e77dca | 611 | kfree(forget); |
39ee059a | 612 | return err; |
9e6268db MS |
613 | } |
614 | ||
1a67aafb | 615 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
616 | dev_t rdev) |
617 | { | |
618 | struct fuse_mknod_in inarg; | |
619 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 620 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
621 | if (IS_ERR(req)) |
622 | return PTR_ERR(req); | |
9e6268db | 623 | |
e0a43ddc MS |
624 | if (!fc->dont_mask) |
625 | mode &= ~current_umask(); | |
626 | ||
9e6268db MS |
627 | memset(&inarg, 0, sizeof(inarg)); |
628 | inarg.mode = mode; | |
629 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 630 | inarg.umask = current_umask(); |
9e6268db MS |
631 | req->in.h.opcode = FUSE_MKNOD; |
632 | req->in.numargs = 2; | |
e0a43ddc MS |
633 | req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : |
634 | sizeof(inarg); | |
9e6268db MS |
635 | req->in.args[0].value = &inarg; |
636 | req->in.args[1].size = entry->d_name.len + 1; | |
637 | req->in.args[1].value = entry->d_name.name; | |
638 | return create_new_entry(fc, req, dir, entry, mode); | |
639 | } | |
640 | ||
4acdaf27 | 641 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
ebfc3b49 | 642 | bool excl) |
9e6268db MS |
643 | { |
644 | return fuse_mknod(dir, entry, mode, 0); | |
645 | } | |
646 | ||
18bb1db3 | 647 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
648 | { |
649 | struct fuse_mkdir_in inarg; | |
650 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 651 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
652 | if (IS_ERR(req)) |
653 | return PTR_ERR(req); | |
9e6268db | 654 | |
e0a43ddc MS |
655 | if (!fc->dont_mask) |
656 | mode &= ~current_umask(); | |
657 | ||
9e6268db MS |
658 | memset(&inarg, 0, sizeof(inarg)); |
659 | inarg.mode = mode; | |
e0a43ddc | 660 | inarg.umask = current_umask(); |
9e6268db MS |
661 | req->in.h.opcode = FUSE_MKDIR; |
662 | req->in.numargs = 2; | |
663 | req->in.args[0].size = sizeof(inarg); | |
664 | req->in.args[0].value = &inarg; | |
665 | req->in.args[1].size = entry->d_name.len + 1; | |
666 | req->in.args[1].value = entry->d_name.name; | |
667 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
668 | } | |
669 | ||
670 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
671 | const char *link) | |
672 | { | |
673 | struct fuse_conn *fc = get_fuse_conn(dir); | |
674 | unsigned len = strlen(link) + 1; | |
b111c8c0 | 675 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
676 | if (IS_ERR(req)) |
677 | return PTR_ERR(req); | |
9e6268db MS |
678 | |
679 | req->in.h.opcode = FUSE_SYMLINK; | |
680 | req->in.numargs = 2; | |
681 | req->in.args[0].size = entry->d_name.len + 1; | |
682 | req->in.args[0].value = entry->d_name.name; | |
683 | req->in.args[1].size = len; | |
684 | req->in.args[1].value = link; | |
685 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
686 | } | |
687 | ||
688 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
689 | { | |
690 | int err; | |
691 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 692 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
693 | if (IS_ERR(req)) |
694 | return PTR_ERR(req); | |
9e6268db MS |
695 | |
696 | req->in.h.opcode = FUSE_UNLINK; | |
697 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
698 | req->in.numargs = 1; |
699 | req->in.args[0].size = entry->d_name.len + 1; | |
700 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 701 | fuse_request_send(fc, req); |
9e6268db MS |
702 | err = req->out.h.error; |
703 | fuse_put_request(fc, req); | |
704 | if (!err) { | |
705 | struct inode *inode = entry->d_inode; | |
ac45d613 | 706 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 707 | |
ac45d613 MS |
708 | spin_lock(&fc->lock); |
709 | fi->attr_version = ++fc->attr_version; | |
dfca7ceb MS |
710 | /* |
711 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
712 | * happen if userspace filesystem is careless. It would be | |
713 | * difficult to enforce correct nlink usage so just ignore this | |
714 | * condition here | |
715 | */ | |
716 | if (inode->i_nlink > 0) | |
717 | drop_nlink(inode); | |
ac45d613 | 718 | spin_unlock(&fc->lock); |
9e6268db MS |
719 | fuse_invalidate_attr(inode); |
720 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 721 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
722 | } else if (err == -EINTR) |
723 | fuse_invalidate_entry(entry); | |
724 | return err; | |
725 | } | |
726 | ||
727 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
728 | { | |
729 | int err; | |
730 | struct fuse_conn *fc = get_fuse_conn(dir); | |
b111c8c0 | 731 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
732 | if (IS_ERR(req)) |
733 | return PTR_ERR(req); | |
9e6268db MS |
734 | |
735 | req->in.h.opcode = FUSE_RMDIR; | |
736 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
737 | req->in.numargs = 1; |
738 | req->in.args[0].size = entry->d_name.len + 1; | |
739 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 740 | fuse_request_send(fc, req); |
9e6268db MS |
741 | err = req->out.h.error; |
742 | fuse_put_request(fc, req); | |
743 | if (!err) { | |
ce71ec36 | 744 | clear_nlink(entry->d_inode); |
9e6268db | 745 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 746 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
747 | } else if (err == -EINTR) |
748 | fuse_invalidate_entry(entry); | |
749 | return err; | |
750 | } | |
751 | ||
752 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
753 | struct inode *newdir, struct dentry *newent) | |
754 | { | |
755 | int err; | |
756 | struct fuse_rename_in inarg; | |
757 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
b111c8c0 | 758 | struct fuse_req *req = fuse_get_req_nopages(fc); |
e4eaac06 | 759 | |
ce1d5a49 MS |
760 | if (IS_ERR(req)) |
761 | return PTR_ERR(req); | |
9e6268db MS |
762 | |
763 | memset(&inarg, 0, sizeof(inarg)); | |
764 | inarg.newdir = get_node_id(newdir); | |
765 | req->in.h.opcode = FUSE_RENAME; | |
766 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
767 | req->in.numargs = 3; |
768 | req->in.args[0].size = sizeof(inarg); | |
769 | req->in.args[0].value = &inarg; | |
770 | req->in.args[1].size = oldent->d_name.len + 1; | |
771 | req->in.args[1].value = oldent->d_name.name; | |
772 | req->in.args[2].size = newent->d_name.len + 1; | |
773 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 774 | fuse_request_send(fc, req); |
9e6268db MS |
775 | err = req->out.h.error; |
776 | fuse_put_request(fc, req); | |
777 | if (!err) { | |
08b63307 MS |
778 | /* ctime changes */ |
779 | fuse_invalidate_attr(oldent->d_inode); | |
780 | ||
9e6268db MS |
781 | fuse_invalidate_attr(olddir); |
782 | if (olddir != newdir) | |
783 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
784 | |
785 | /* newent will end up negative */ | |
5219f346 MS |
786 | if (newent->d_inode) { |
787 | fuse_invalidate_attr(newent->d_inode); | |
8cbdf1e6 | 788 | fuse_invalidate_entry_cache(newent); |
5219f346 | 789 | } |
9e6268db MS |
790 | } else if (err == -EINTR) { |
791 | /* If request was interrupted, DEITY only knows if the | |
792 | rename actually took place. If the invalidation | |
793 | fails (e.g. some process has CWD under the renamed | |
794 | directory), then there can be inconsistency between | |
795 | the dcache and the real filesystem. Tough luck. */ | |
796 | fuse_invalidate_entry(oldent); | |
797 | if (newent->d_inode) | |
798 | fuse_invalidate_entry(newent); | |
799 | } | |
800 | ||
801 | return err; | |
802 | } | |
803 | ||
804 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
805 | struct dentry *newent) | |
806 | { | |
807 | int err; | |
808 | struct fuse_link_in inarg; | |
809 | struct inode *inode = entry->d_inode; | |
810 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 811 | struct fuse_req *req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
812 | if (IS_ERR(req)) |
813 | return PTR_ERR(req); | |
9e6268db MS |
814 | |
815 | memset(&inarg, 0, sizeof(inarg)); | |
816 | inarg.oldnodeid = get_node_id(inode); | |
817 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
818 | req->in.numargs = 2; |
819 | req->in.args[0].size = sizeof(inarg); | |
820 | req->in.args[0].value = &inarg; | |
821 | req->in.args[1].size = newent->d_name.len + 1; | |
822 | req->in.args[1].value = newent->d_name.name; | |
823 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
824 | /* Contrary to "normal" filesystems it can happen that link | |
825 | makes two "logical" inodes point to the same "physical" | |
826 | inode. We invalidate the attributes of the old one, so it | |
827 | will reflect changes in the backing inode (link count, | |
828 | etc.) | |
829 | */ | |
ac45d613 MS |
830 | if (!err) { |
831 | struct fuse_inode *fi = get_fuse_inode(inode); | |
832 | ||
833 | spin_lock(&fc->lock); | |
834 | fi->attr_version = ++fc->attr_version; | |
835 | inc_nlink(inode); | |
836 | spin_unlock(&fc->lock); | |
9e6268db | 837 | fuse_invalidate_attr(inode); |
ac45d613 MS |
838 | } else if (err == -EINTR) { |
839 | fuse_invalidate_attr(inode); | |
840 | } | |
9e6268db MS |
841 | return err; |
842 | } | |
843 | ||
1fb69e78 MS |
844 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
845 | struct kstat *stat) | |
846 | { | |
203627bb MS |
847 | unsigned int blkbits; |
848 | ||
1fb69e78 MS |
849 | stat->dev = inode->i_sb->s_dev; |
850 | stat->ino = attr->ino; | |
851 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
852 | stat->nlink = attr->nlink; | |
499dcf20 EB |
853 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
854 | stat->gid = make_kgid(&init_user_ns, attr->gid); | |
1fb69e78 MS |
855 | stat->rdev = inode->i_rdev; |
856 | stat->atime.tv_sec = attr->atime; | |
857 | stat->atime.tv_nsec = attr->atimensec; | |
858 | stat->mtime.tv_sec = attr->mtime; | |
859 | stat->mtime.tv_nsec = attr->mtimensec; | |
860 | stat->ctime.tv_sec = attr->ctime; | |
861 | stat->ctime.tv_nsec = attr->ctimensec; | |
862 | stat->size = attr->size; | |
863 | stat->blocks = attr->blocks; | |
203627bb MS |
864 | |
865 | if (attr->blksize != 0) | |
866 | blkbits = ilog2(attr->blksize); | |
867 | else | |
868 | blkbits = inode->i_sb->s_blocksize_bits; | |
869 | ||
870 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
871 | } |
872 | ||
c79e322f MS |
873 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
874 | struct file *file) | |
e5e5558e MS |
875 | { |
876 | int err; | |
c79e322f MS |
877 | struct fuse_getattr_in inarg; |
878 | struct fuse_attr_out outarg; | |
e5e5558e | 879 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
880 | struct fuse_req *req; |
881 | u64 attr_version; | |
882 | ||
b111c8c0 | 883 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
884 | if (IS_ERR(req)) |
885 | return PTR_ERR(req); | |
e5e5558e | 886 | |
7dca9fd3 | 887 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 888 | |
c79e322f | 889 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 890 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
891 | /* Directories have separate file-handle space */ |
892 | if (file && S_ISREG(inode->i_mode)) { | |
893 | struct fuse_file *ff = file->private_data; | |
894 | ||
895 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
896 | inarg.fh = ff->fh; | |
897 | } | |
e5e5558e MS |
898 | req->in.h.opcode = FUSE_GETATTR; |
899 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
900 | req->in.numargs = 1; |
901 | req->in.args[0].size = sizeof(inarg); | |
902 | req->in.args[0].value = &inarg; | |
e5e5558e | 903 | req->out.numargs = 1; |
0e9663ee MS |
904 | if (fc->minor < 9) |
905 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
906 | else | |
907 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 908 | req->out.args[0].value = &outarg; |
b93f858a | 909 | fuse_request_send(fc, req); |
e5e5558e MS |
910 | err = req->out.h.error; |
911 | fuse_put_request(fc, req); | |
912 | if (!err) { | |
c79e322f | 913 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
914 | make_bad_inode(inode); |
915 | err = -EIO; | |
916 | } else { | |
c79e322f MS |
917 | fuse_change_attributes(inode, &outarg.attr, |
918 | attr_timeout(&outarg), | |
1fb69e78 MS |
919 | attr_version); |
920 | if (stat) | |
c79e322f | 921 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
922 | } |
923 | } | |
924 | return err; | |
925 | } | |
926 | ||
bcb4be80 MS |
927 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
928 | struct file *file, bool *refreshed) | |
929 | { | |
930 | struct fuse_inode *fi = get_fuse_inode(inode); | |
931 | int err; | |
932 | bool r; | |
933 | ||
934 | if (fi->i_time < get_jiffies_64()) { | |
935 | r = true; | |
936 | err = fuse_do_getattr(inode, stat, file); | |
937 | } else { | |
938 | r = false; | |
939 | err = 0; | |
940 | if (stat) { | |
941 | generic_fillattr(inode, stat); | |
942 | stat->mode = fi->orig_i_mode; | |
45c72cd7 | 943 | stat->ino = fi->orig_ino; |
bcb4be80 MS |
944 | } |
945 | } | |
946 | ||
947 | if (refreshed != NULL) | |
948 | *refreshed = r; | |
949 | ||
950 | return err; | |
951 | } | |
952 | ||
3b463ae0 | 953 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 954 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
955 | { |
956 | int err = -ENOTDIR; | |
957 | struct inode *parent; | |
958 | struct dentry *dir; | |
959 | struct dentry *entry; | |
960 | ||
961 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
962 | if (!parent) | |
963 | return -ENOENT; | |
964 | ||
965 | mutex_lock(&parent->i_mutex); | |
966 | if (!S_ISDIR(parent->i_mode)) | |
967 | goto unlock; | |
968 | ||
969 | err = -ENOENT; | |
970 | dir = d_find_alias(parent); | |
971 | if (!dir) | |
972 | goto unlock; | |
973 | ||
974 | entry = d_lookup(dir, name); | |
975 | dput(dir); | |
976 | if (!entry) | |
977 | goto unlock; | |
978 | ||
979 | fuse_invalidate_attr(parent); | |
980 | fuse_invalidate_entry(entry); | |
451d0f59 JM |
981 | |
982 | if (child_nodeid != 0 && entry->d_inode) { | |
983 | mutex_lock(&entry->d_inode->i_mutex); | |
984 | if (get_node_id(entry->d_inode) != child_nodeid) { | |
985 | err = -ENOENT; | |
986 | goto badentry; | |
987 | } | |
988 | if (d_mountpoint(entry)) { | |
989 | err = -EBUSY; | |
990 | goto badentry; | |
991 | } | |
992 | if (S_ISDIR(entry->d_inode->i_mode)) { | |
993 | shrink_dcache_parent(entry); | |
994 | if (!simple_empty(entry)) { | |
995 | err = -ENOTEMPTY; | |
996 | goto badentry; | |
997 | } | |
998 | entry->d_inode->i_flags |= S_DEAD; | |
999 | } | |
1000 | dont_mount(entry); | |
1001 | clear_nlink(entry->d_inode); | |
1002 | err = 0; | |
1003 | badentry: | |
1004 | mutex_unlock(&entry->d_inode->i_mutex); | |
1005 | if (!err) | |
1006 | d_delete(entry); | |
1007 | } else { | |
1008 | err = 0; | |
1009 | } | |
3b463ae0 | 1010 | dput(entry); |
3b463ae0 JM |
1011 | |
1012 | unlock: | |
1013 | mutex_unlock(&parent->i_mutex); | |
1014 | iput(parent); | |
1015 | return err; | |
1016 | } | |
1017 | ||
87729a55 MS |
1018 | /* |
1019 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1020 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1021 | * means, that the filesystem daemon is able to record the exact |
1022 | * filesystem operations performed, and can also control the behavior | |
1023 | * of the requester process in otherwise impossible ways. For example | |
1024 | * it can delay the operation for arbitrary length of time allowing | |
1025 | * DoS against the requester. | |
1026 | * | |
1027 | * For this reason only those processes can call into the filesystem, | |
1028 | * for which the owner of the mount has ptrace privilege. This | |
1029 | * excludes processes started by other users, suid or sgid processes. | |
1030 | */ | |
c2132c1b | 1031 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1032 | { |
c69e8d9c | 1033 | const struct cred *cred; |
87729a55 | 1034 | |
c69e8d9c | 1035 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
1036 | return 1; |
1037 | ||
c2132c1b | 1038 | cred = current_cred(); |
499dcf20 EB |
1039 | if (uid_eq(cred->euid, fc->user_id) && |
1040 | uid_eq(cred->suid, fc->user_id) && | |
1041 | uid_eq(cred->uid, fc->user_id) && | |
1042 | gid_eq(cred->egid, fc->group_id) && | |
1043 | gid_eq(cred->sgid, fc->group_id) && | |
1044 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1045 | return 1; |
c69e8d9c | 1046 | |
c2132c1b | 1047 | return 0; |
87729a55 MS |
1048 | } |
1049 | ||
31d40d74 MS |
1050 | static int fuse_access(struct inode *inode, int mask) |
1051 | { | |
1052 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1053 | struct fuse_req *req; | |
1054 | struct fuse_access_in inarg; | |
1055 | int err; | |
1056 | ||
1057 | if (fc->no_access) | |
1058 | return 0; | |
1059 | ||
b111c8c0 | 1060 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1061 | if (IS_ERR(req)) |
1062 | return PTR_ERR(req); | |
31d40d74 MS |
1063 | |
1064 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 1065 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
1066 | req->in.h.opcode = FUSE_ACCESS; |
1067 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
1068 | req->in.numargs = 1; |
1069 | req->in.args[0].size = sizeof(inarg); | |
1070 | req->in.args[0].value = &inarg; | |
b93f858a | 1071 | fuse_request_send(fc, req); |
31d40d74 MS |
1072 | err = req->out.h.error; |
1073 | fuse_put_request(fc, req); | |
1074 | if (err == -ENOSYS) { | |
1075 | fc->no_access = 1; | |
1076 | err = 0; | |
1077 | } | |
1078 | return err; | |
1079 | } | |
1080 | ||
10556cb2 | 1081 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1082 | { |
10556cb2 | 1083 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1084 | return -ECHILD; |
1085 | ||
1086 | return fuse_do_getattr(inode, NULL, NULL); | |
1087 | } | |
1088 | ||
6f9f1180 MS |
1089 | /* |
1090 | * Check permission. The two basic access models of FUSE are: | |
1091 | * | |
1092 | * 1) Local access checking ('default_permissions' mount option) based | |
1093 | * on file mode. This is the plain old disk filesystem permission | |
1094 | * modell. | |
1095 | * | |
1096 | * 2) "Remote" access checking, where server is responsible for | |
1097 | * checking permission in each inode operation. An exception to this | |
1098 | * is if ->permission() was invoked from sys_access() in which case an | |
1099 | * access request is sent. Execute permission is still checked | |
1100 | * locally based on file mode. | |
1101 | */ | |
10556cb2 | 1102 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1103 | { |
1104 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1105 | bool refreshed = false; |
1106 | int err = 0; | |
e5e5558e | 1107 | |
c2132c1b | 1108 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1109 | return -EACCES; |
244f6385 MS |
1110 | |
1111 | /* | |
e8e96157 | 1112 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1113 | */ |
e8e96157 MS |
1114 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1115 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
19690ddb MS |
1116 | struct fuse_inode *fi = get_fuse_inode(inode); |
1117 | ||
1118 | if (fi->i_time < get_jiffies_64()) { | |
1119 | refreshed = true; | |
1120 | ||
10556cb2 | 1121 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1122 | if (err) |
1123 | return err; | |
1124 | } | |
244f6385 MS |
1125 | } |
1126 | ||
1127 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
2830ba7f | 1128 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1129 | |
1130 | /* If permission is denied, try to refresh file | |
1131 | attributes. This is also needed, because the root | |
1132 | node will at first have no permissions */ | |
244f6385 | 1133 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1134 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1135 | if (!err) |
2830ba7f | 1136 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1137 | } |
1138 | ||
6f9f1180 MS |
1139 | /* Note: the opposite of the above test does not |
1140 | exist. So if permissions are revoked this won't be | |
1141 | noticed immediately, only after the attribute | |
1142 | timeout has expired */ | |
9cfcac81 | 1143 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
10556cb2 | 1144 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1145 | return -ECHILD; |
1146 | ||
e8e96157 MS |
1147 | err = fuse_access(inode, mask); |
1148 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1149 | if (!(inode->i_mode & S_IXUGO)) { | |
1150 | if (refreshed) | |
1151 | return -EACCES; | |
1152 | ||
10556cb2 | 1153 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1154 | if (!err && !(inode->i_mode & S_IXUGO)) |
1155 | return -EACCES; | |
1156 | } | |
e5e5558e | 1157 | } |
244f6385 | 1158 | return err; |
e5e5558e MS |
1159 | } |
1160 | ||
1161 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
1162 | void *dstbuf, filldir_t filldir) | |
1163 | { | |
1164 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1165 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1166 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
1167 | int over; | |
1168 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1169 | return -EIO; | |
1170 | if (reclen > nbytes) | |
1171 | break; | |
1172 | ||
1173 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
1174 | file->f_pos, dirent->ino, dirent->type); | |
1175 | if (over) | |
1176 | break; | |
1177 | ||
1178 | buf += reclen; | |
1179 | nbytes -= reclen; | |
1180 | file->f_pos = dirent->off; | |
1181 | } | |
1182 | ||
1183 | return 0; | |
1184 | } | |
1185 | ||
0b05b183 AA |
1186 | static int fuse_direntplus_link(struct file *file, |
1187 | struct fuse_direntplus *direntplus, | |
1188 | u64 attr_version) | |
1189 | { | |
1190 | int err; | |
1191 | struct fuse_entry_out *o = &direntplus->entry_out; | |
1192 | struct fuse_dirent *dirent = &direntplus->dirent; | |
1193 | struct dentry *parent = file->f_path.dentry; | |
1194 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); | |
1195 | struct dentry *dentry; | |
1196 | struct dentry *alias; | |
1197 | struct inode *dir = parent->d_inode; | |
1198 | struct fuse_conn *fc; | |
1199 | struct inode *inode; | |
1200 | ||
1201 | if (!o->nodeid) { | |
1202 | /* | |
1203 | * Unlike in the case of fuse_lookup, zero nodeid does not mean | |
1204 | * ENOENT. Instead, it only means the userspace filesystem did | |
1205 | * not want to return attributes/handle for this entry. | |
1206 | * | |
1207 | * So do nothing. | |
1208 | */ | |
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | if (name.name[0] == '.') { | |
1213 | /* | |
1214 | * We could potentially refresh the attributes of the directory | |
1215 | * and its parent? | |
1216 | */ | |
1217 | if (name.len == 1) | |
1218 | return 0; | |
1219 | if (name.name[1] == '.' && name.len == 2) | |
1220 | return 0; | |
1221 | } | |
1222 | fc = get_fuse_conn(dir); | |
1223 | ||
1224 | name.hash = full_name_hash(name.name, name.len); | |
1225 | dentry = d_lookup(parent, &name); | |
1226 | if (dentry && dentry->d_inode) { | |
1227 | inode = dentry->d_inode; | |
1228 | if (get_node_id(inode) == o->nodeid) { | |
1229 | struct fuse_inode *fi; | |
1230 | fi = get_fuse_inode(inode); | |
1231 | spin_lock(&fc->lock); | |
1232 | fi->nlookup++; | |
1233 | spin_unlock(&fc->lock); | |
1234 | ||
1235 | /* | |
1236 | * The other branch to 'found' comes via fuse_iget() | |
1237 | * which bumps nlookup inside | |
1238 | */ | |
1239 | goto found; | |
1240 | } | |
1241 | err = d_invalidate(dentry); | |
1242 | if (err) | |
1243 | goto out; | |
1244 | dput(dentry); | |
1245 | dentry = NULL; | |
1246 | } | |
1247 | ||
1248 | dentry = d_alloc(parent, &name); | |
1249 | err = -ENOMEM; | |
1250 | if (!dentry) | |
1251 | goto out; | |
1252 | ||
1253 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, | |
1254 | &o->attr, entry_attr_timeout(o), attr_version); | |
1255 | if (!inode) | |
1256 | goto out; | |
1257 | ||
1258 | alias = d_materialise_unique(dentry, inode); | |
1259 | err = PTR_ERR(alias); | |
1260 | if (IS_ERR(alias)) | |
1261 | goto out; | |
1262 | if (alias) { | |
1263 | dput(dentry); | |
1264 | dentry = alias; | |
1265 | } | |
1266 | ||
1267 | found: | |
1268 | fuse_change_attributes(inode, &o->attr, entry_attr_timeout(o), | |
1269 | attr_version); | |
1270 | ||
1271 | fuse_change_entry_timeout(dentry, o); | |
1272 | ||
1273 | err = 0; | |
1274 | out: | |
1275 | if (dentry) | |
1276 | dput(dentry); | |
1277 | return err; | |
1278 | } | |
1279 | ||
1280 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, | |
1281 | void *dstbuf, filldir_t filldir, u64 attr_version) | |
1282 | { | |
1283 | struct fuse_direntplus *direntplus; | |
1284 | struct fuse_dirent *dirent; | |
1285 | size_t reclen; | |
1286 | int over = 0; | |
1287 | int ret; | |
1288 | ||
1289 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { | |
1290 | direntplus = (struct fuse_direntplus *) buf; | |
1291 | dirent = &direntplus->dirent; | |
1292 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); | |
1293 | ||
1294 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1295 | return -EIO; | |
1296 | if (reclen > nbytes) | |
1297 | break; | |
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 | */ | |
1306 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
1307 | file->f_pos, dirent->ino, | |
1308 | dirent->type); | |
1309 | file->f_pos = dirent->off; | |
1310 | } | |
1311 | ||
1312 | buf += reclen; | |
1313 | nbytes -= reclen; | |
1314 | ||
1315 | ret = fuse_direntplus_link(file, direntplus, attr_version); | |
1316 | if (ret) | |
1317 | fuse_force_forget(file, direntplus->entry_out.nodeid); | |
1318 | } | |
1319 | ||
1320 | return 0; | |
1321 | } | |
1322 | ||
04730fef | 1323 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 1324 | { |
4582a4ab | 1325 | int plus, err; |
04730fef MS |
1326 | size_t nbytes; |
1327 | struct page *page; | |
496ad9aa | 1328 | struct inode *inode = file_inode(file); |
e5e5558e | 1329 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 | 1330 | struct fuse_req *req; |
0b05b183 | 1331 | u64 attr_version = 0; |
248d86e8 MS |
1332 | |
1333 | if (is_bad_inode(inode)) | |
1334 | return -EIO; | |
1335 | ||
b111c8c0 | 1336 | req = fuse_get_req(fc, 1); |
ce1d5a49 MS |
1337 | if (IS_ERR(req)) |
1338 | return PTR_ERR(req); | |
e5e5558e | 1339 | |
04730fef MS |
1340 | page = alloc_page(GFP_KERNEL); |
1341 | if (!page) { | |
1342 | fuse_put_request(fc, req); | |
1343 | return -ENOMEM; | |
1344 | } | |
4582a4ab FS |
1345 | |
1346 | plus = fuse_use_readdirplus(inode, file); | |
f4975c67 | 1347 | req->out.argpages = 1; |
04730fef MS |
1348 | req->num_pages = 1; |
1349 | req->pages[0] = page; | |
85f40aec | 1350 | req->page_descs[0].length = PAGE_SIZE; |
4582a4ab | 1351 | if (plus) { |
0b05b183 AA |
1352 | attr_version = fuse_get_attr_version(fc); |
1353 | fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, | |
1354 | FUSE_READDIRPLUS); | |
1355 | } else { | |
1356 | fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, | |
1357 | FUSE_READDIR); | |
1358 | } | |
b93f858a | 1359 | fuse_request_send(fc, req); |
361b1eb5 | 1360 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1361 | err = req->out.h.error; |
1362 | fuse_put_request(fc, req); | |
0b05b183 | 1363 | if (!err) { |
4582a4ab | 1364 | if (plus) { |
0b05b183 AA |
1365 | err = parse_dirplusfile(page_address(page), nbytes, |
1366 | file, dstbuf, filldir, | |
1367 | attr_version); | |
1368 | } else { | |
1369 | err = parse_dirfile(page_address(page), nbytes, file, | |
1370 | dstbuf, filldir); | |
1371 | } | |
1372 | } | |
e5e5558e | 1373 | |
04730fef | 1374 | __free_page(page); |
b36c31ba | 1375 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 1376 | return err; |
e5e5558e MS |
1377 | } |
1378 | ||
1379 | static char *read_link(struct dentry *dentry) | |
1380 | { | |
1381 | struct inode *inode = dentry->d_inode; | |
1382 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b111c8c0 | 1383 | struct fuse_req *req = fuse_get_req_nopages(fc); |
e5e5558e MS |
1384 | char *link; |
1385 | ||
ce1d5a49 | 1386 | if (IS_ERR(req)) |
e231c2ee | 1387 | return ERR_CAST(req); |
e5e5558e MS |
1388 | |
1389 | link = (char *) __get_free_page(GFP_KERNEL); | |
1390 | if (!link) { | |
1391 | link = ERR_PTR(-ENOMEM); | |
1392 | goto out; | |
1393 | } | |
1394 | req->in.h.opcode = FUSE_READLINK; | |
1395 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1396 | req->out.argvar = 1; |
1397 | req->out.numargs = 1; | |
1398 | req->out.args[0].size = PAGE_SIZE - 1; | |
1399 | req->out.args[0].value = link; | |
b93f858a | 1400 | fuse_request_send(fc, req); |
e5e5558e MS |
1401 | if (req->out.h.error) { |
1402 | free_page((unsigned long) link); | |
1403 | link = ERR_PTR(req->out.h.error); | |
1404 | } else | |
1405 | link[req->out.args[0].size] = '\0'; | |
1406 | out: | |
1407 | fuse_put_request(fc, req); | |
b36c31ba | 1408 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
1409 | return link; |
1410 | } | |
1411 | ||
1412 | static void free_link(char *link) | |
1413 | { | |
1414 | if (!IS_ERR(link)) | |
1415 | free_page((unsigned long) link); | |
1416 | } | |
1417 | ||
1418 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1419 | { | |
1420 | nd_set_link(nd, read_link(dentry)); | |
1421 | return NULL; | |
1422 | } | |
1423 | ||
1424 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1425 | { | |
1426 | free_link(nd_get_link(nd)); | |
1427 | } | |
1428 | ||
1429 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1430 | { | |
91fe96b4 | 1431 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1432 | } |
1433 | ||
1434 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1435 | { | |
8b0797a4 MS |
1436 | fuse_release_common(file, FUSE_RELEASEDIR); |
1437 | ||
1438 | return 0; | |
e5e5558e MS |
1439 | } |
1440 | ||
02c24a82 JB |
1441 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1442 | int datasync) | |
82547981 | 1443 | { |
02c24a82 | 1444 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1445 | } |
1446 | ||
b18da0c5 MS |
1447 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1448 | unsigned long arg) | |
1449 | { | |
1450 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1451 | ||
1452 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1453 | if (fc->minor < 18) | |
1454 | return -ENOTTY; | |
1455 | ||
1456 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1457 | } | |
1458 | ||
1459 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1460 | unsigned long arg) | |
1461 | { | |
1462 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1463 | ||
1464 | if (fc->minor < 18) | |
1465 | return -ENOTTY; | |
1466 | ||
1467 | return fuse_ioctl_common(file, cmd, arg, | |
1468 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1469 | } | |
1470 | ||
17637cba MS |
1471 | static bool update_mtime(unsigned ivalid) |
1472 | { | |
1473 | /* Always update if mtime is explicitly set */ | |
1474 | if (ivalid & ATTR_MTIME_SET) | |
1475 | return true; | |
1476 | ||
1477 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ | |
1478 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1479 | return false; | |
1480 | ||
1481 | /* In all other cases update */ | |
1482 | return true; | |
1483 | } | |
1484 | ||
befc649c | 1485 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
1486 | { |
1487 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1488 | |
1489 | if (ivalid & ATTR_MODE) | |
befc649c | 1490 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1491 | if (ivalid & ATTR_UID) |
499dcf20 | 1492 | arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid); |
9e6268db | 1493 | if (ivalid & ATTR_GID) |
499dcf20 | 1494 | arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid); |
9e6268db | 1495 | if (ivalid & ATTR_SIZE) |
befc649c | 1496 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1497 | if (ivalid & ATTR_ATIME) { |
1498 | arg->valid |= FATTR_ATIME; | |
befc649c | 1499 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1500 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1501 | if (!(ivalid & ATTR_ATIME_SET)) | |
1502 | arg->valid |= FATTR_ATIME_NOW; | |
1503 | } | |
1504 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) { | |
1505 | arg->valid |= FATTR_MTIME; | |
befc649c | 1506 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba MS |
1507 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
1508 | if (!(ivalid & ATTR_MTIME_SET)) | |
1509 | arg->valid |= FATTR_MTIME_NOW; | |
befc649c | 1510 | } |
9e6268db MS |
1511 | } |
1512 | ||
3be5a52b MS |
1513 | /* |
1514 | * Prevent concurrent writepages on inode | |
1515 | * | |
1516 | * This is done by adding a negative bias to the inode write counter | |
1517 | * and waiting for all pending writes to finish. | |
1518 | */ | |
1519 | void fuse_set_nowrite(struct inode *inode) | |
1520 | { | |
1521 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1522 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1523 | ||
1524 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1525 | ||
1526 | spin_lock(&fc->lock); | |
1527 | BUG_ON(fi->writectr < 0); | |
1528 | fi->writectr += FUSE_NOWRITE; | |
1529 | spin_unlock(&fc->lock); | |
1530 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1531 | } | |
1532 | ||
1533 | /* | |
1534 | * Allow writepages on inode | |
1535 | * | |
1536 | * Remove the bias from the writecounter and send any queued | |
1537 | * writepages. | |
1538 | */ | |
1539 | static void __fuse_release_nowrite(struct inode *inode) | |
1540 | { | |
1541 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1542 | ||
1543 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1544 | fi->writectr = 0; | |
1545 | fuse_flush_writepages(inode); | |
1546 | } | |
1547 | ||
1548 | void fuse_release_nowrite(struct inode *inode) | |
1549 | { | |
1550 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1551 | ||
1552 | spin_lock(&fc->lock); | |
1553 | __fuse_release_nowrite(inode); | |
1554 | spin_unlock(&fc->lock); | |
1555 | } | |
1556 | ||
6f9f1180 MS |
1557 | /* |
1558 | * Set attributes, and at the same time refresh them. | |
1559 | * | |
1560 | * Truncation is slightly complicated, because the 'truncate' request | |
1561 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1562 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1563 | * and the actual truncation by hand. | |
6f9f1180 | 1564 | */ |
49d4914f MS |
1565 | static int fuse_do_setattr(struct dentry *entry, struct iattr *attr, |
1566 | struct file *file) | |
9e6268db MS |
1567 | { |
1568 | struct inode *inode = entry->d_inode; | |
1569 | struct fuse_conn *fc = get_fuse_conn(inode); | |
9e6268db MS |
1570 | struct fuse_req *req; |
1571 | struct fuse_setattr_in inarg; | |
1572 | struct fuse_attr_out outarg; | |
3be5a52b MS |
1573 | bool is_truncate = false; |
1574 | loff_t oldsize; | |
9e6268db | 1575 | int err; |
9e6268db | 1576 | |
c2132c1b | 1577 | if (!fuse_allow_current_process(fc)) |
e57ac683 MS |
1578 | return -EACCES; |
1579 | ||
db78b877 CH |
1580 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1581 | attr->ia_valid |= ATTR_FORCE; | |
1582 | ||
1583 | err = inode_change_ok(inode, attr); | |
1584 | if (err) | |
1585 | return err; | |
1e9a4ed9 | 1586 | |
8d56addd MS |
1587 | if (attr->ia_valid & ATTR_OPEN) { |
1588 | if (fc->atomic_o_trunc) | |
1589 | return 0; | |
1590 | file = NULL; | |
1591 | } | |
6ff958ed | 1592 | |
2c27c65e | 1593 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1594 | is_truncate = true; |
9e6268db | 1595 | |
b111c8c0 | 1596 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1597 | if (IS_ERR(req)) |
1598 | return PTR_ERR(req); | |
9e6268db | 1599 | |
3be5a52b MS |
1600 | if (is_truncate) |
1601 | fuse_set_nowrite(inode); | |
1602 | ||
9e6268db | 1603 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1604 | memset(&outarg, 0, sizeof(outarg)); |
befc649c | 1605 | iattr_to_fattr(attr, &inarg); |
49d4914f MS |
1606 | if (file) { |
1607 | struct fuse_file *ff = file->private_data; | |
1608 | inarg.valid |= FATTR_FH; | |
1609 | inarg.fh = ff->fh; | |
1610 | } | |
f3332114 MS |
1611 | if (attr->ia_valid & ATTR_SIZE) { |
1612 | /* For mandatory locking in truncate */ | |
1613 | inarg.valid |= FATTR_LOCKOWNER; | |
1614 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1615 | } | |
9e6268db MS |
1616 | req->in.h.opcode = FUSE_SETATTR; |
1617 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1618 | req->in.numargs = 1; |
1619 | req->in.args[0].size = sizeof(inarg); | |
1620 | req->in.args[0].value = &inarg; | |
1621 | req->out.numargs = 1; | |
0e9663ee MS |
1622 | if (fc->minor < 9) |
1623 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1624 | else | |
1625 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 1626 | req->out.args[0].value = &outarg; |
b93f858a | 1627 | fuse_request_send(fc, req); |
9e6268db MS |
1628 | err = req->out.h.error; |
1629 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1630 | if (err) { |
1631 | if (err == -EINTR) | |
1632 | fuse_invalidate_attr(inode); | |
3be5a52b | 1633 | goto error; |
e00d2c2d | 1634 | } |
9e6268db | 1635 | |
e00d2c2d MS |
1636 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1637 | make_bad_inode(inode); | |
3be5a52b MS |
1638 | err = -EIO; |
1639 | goto error; | |
1640 | } | |
1641 | ||
1642 | spin_lock(&fc->lock); | |
1643 | fuse_change_attributes_common(inode, &outarg.attr, | |
1644 | attr_timeout(&outarg)); | |
1645 | oldsize = inode->i_size; | |
1646 | i_size_write(inode, outarg.attr.size); | |
1647 | ||
1648 | if (is_truncate) { | |
1649 | /* NOTE: this may release/reacquire fc->lock */ | |
1650 | __fuse_release_nowrite(inode); | |
1651 | } | |
1652 | spin_unlock(&fc->lock); | |
1653 | ||
1654 | /* | |
1655 | * Only call invalidate_inode_pages2() after removing | |
1656 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1657 | */ | |
1658 | if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
c08d3b0e | 1659 | truncate_pagecache(inode, oldsize, outarg.attr.size); |
3be5a52b | 1660 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1661 | } |
1662 | ||
e00d2c2d | 1663 | return 0; |
3be5a52b MS |
1664 | |
1665 | error: | |
1666 | if (is_truncate) | |
1667 | fuse_release_nowrite(inode); | |
1668 | ||
1669 | return err; | |
9e6268db MS |
1670 | } |
1671 | ||
49d4914f MS |
1672 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1673 | { | |
1674 | if (attr->ia_valid & ATTR_FILE) | |
1675 | return fuse_do_setattr(entry, attr, attr->ia_file); | |
1676 | else | |
1677 | return fuse_do_setattr(entry, attr, NULL); | |
1678 | } | |
1679 | ||
e5e5558e MS |
1680 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1681 | struct kstat *stat) | |
1682 | { | |
1683 | struct inode *inode = entry->d_inode; | |
244f6385 | 1684 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1685 | |
c2132c1b | 1686 | if (!fuse_allow_current_process(fc)) |
244f6385 MS |
1687 | return -EACCES; |
1688 | ||
bcb4be80 | 1689 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1690 | } |
1691 | ||
92a8780e MS |
1692 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1693 | const void *value, size_t size, int flags) | |
1694 | { | |
1695 | struct inode *inode = entry->d_inode; | |
1696 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1697 | struct fuse_req *req; | |
1698 | struct fuse_setxattr_in inarg; | |
1699 | int err; | |
1700 | ||
92a8780e MS |
1701 | if (fc->no_setxattr) |
1702 | return -EOPNOTSUPP; | |
1703 | ||
b111c8c0 | 1704 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1705 | if (IS_ERR(req)) |
1706 | return PTR_ERR(req); | |
92a8780e MS |
1707 | |
1708 | memset(&inarg, 0, sizeof(inarg)); | |
1709 | inarg.size = size; | |
1710 | inarg.flags = flags; | |
1711 | req->in.h.opcode = FUSE_SETXATTR; | |
1712 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1713 | req->in.numargs = 3; |
1714 | req->in.args[0].size = sizeof(inarg); | |
1715 | req->in.args[0].value = &inarg; | |
1716 | req->in.args[1].size = strlen(name) + 1; | |
1717 | req->in.args[1].value = name; | |
1718 | req->in.args[2].size = size; | |
1719 | req->in.args[2].value = value; | |
b93f858a | 1720 | fuse_request_send(fc, req); |
92a8780e MS |
1721 | err = req->out.h.error; |
1722 | fuse_put_request(fc, req); | |
1723 | if (err == -ENOSYS) { | |
1724 | fc->no_setxattr = 1; | |
1725 | err = -EOPNOTSUPP; | |
1726 | } | |
1727 | return err; | |
1728 | } | |
1729 | ||
1730 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1731 | void *value, size_t size) | |
1732 | { | |
1733 | struct inode *inode = entry->d_inode; | |
1734 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1735 | struct fuse_req *req; | |
1736 | struct fuse_getxattr_in inarg; | |
1737 | struct fuse_getxattr_out outarg; | |
1738 | ssize_t ret; | |
1739 | ||
1740 | if (fc->no_getxattr) | |
1741 | return -EOPNOTSUPP; | |
1742 | ||
b111c8c0 | 1743 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1744 | if (IS_ERR(req)) |
1745 | return PTR_ERR(req); | |
92a8780e MS |
1746 | |
1747 | memset(&inarg, 0, sizeof(inarg)); | |
1748 | inarg.size = size; | |
1749 | req->in.h.opcode = FUSE_GETXATTR; | |
1750 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1751 | req->in.numargs = 2; |
1752 | req->in.args[0].size = sizeof(inarg); | |
1753 | req->in.args[0].value = &inarg; | |
1754 | req->in.args[1].size = strlen(name) + 1; | |
1755 | req->in.args[1].value = name; | |
1756 | /* This is really two different operations rolled into one */ | |
1757 | req->out.numargs = 1; | |
1758 | if (size) { | |
1759 | req->out.argvar = 1; | |
1760 | req->out.args[0].size = size; | |
1761 | req->out.args[0].value = value; | |
1762 | } else { | |
1763 | req->out.args[0].size = sizeof(outarg); | |
1764 | req->out.args[0].value = &outarg; | |
1765 | } | |
b93f858a | 1766 | fuse_request_send(fc, req); |
92a8780e MS |
1767 | ret = req->out.h.error; |
1768 | if (!ret) | |
1769 | ret = size ? req->out.args[0].size : outarg.size; | |
1770 | else { | |
1771 | if (ret == -ENOSYS) { | |
1772 | fc->no_getxattr = 1; | |
1773 | ret = -EOPNOTSUPP; | |
1774 | } | |
1775 | } | |
1776 | fuse_put_request(fc, req); | |
1777 | return ret; | |
1778 | } | |
1779 | ||
1780 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1781 | { | |
1782 | struct inode *inode = entry->d_inode; | |
1783 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1784 | struct fuse_req *req; | |
1785 | struct fuse_getxattr_in inarg; | |
1786 | struct fuse_getxattr_out outarg; | |
1787 | ssize_t ret; | |
1788 | ||
c2132c1b | 1789 | if (!fuse_allow_current_process(fc)) |
e57ac683 MS |
1790 | return -EACCES; |
1791 | ||
92a8780e MS |
1792 | if (fc->no_listxattr) |
1793 | return -EOPNOTSUPP; | |
1794 | ||
b111c8c0 | 1795 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1796 | if (IS_ERR(req)) |
1797 | return PTR_ERR(req); | |
92a8780e MS |
1798 | |
1799 | memset(&inarg, 0, sizeof(inarg)); | |
1800 | inarg.size = size; | |
1801 | req->in.h.opcode = FUSE_LISTXATTR; | |
1802 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1803 | req->in.numargs = 1; |
1804 | req->in.args[0].size = sizeof(inarg); | |
1805 | req->in.args[0].value = &inarg; | |
1806 | /* This is really two different operations rolled into one */ | |
1807 | req->out.numargs = 1; | |
1808 | if (size) { | |
1809 | req->out.argvar = 1; | |
1810 | req->out.args[0].size = size; | |
1811 | req->out.args[0].value = list; | |
1812 | } else { | |
1813 | req->out.args[0].size = sizeof(outarg); | |
1814 | req->out.args[0].value = &outarg; | |
1815 | } | |
b93f858a | 1816 | fuse_request_send(fc, req); |
92a8780e MS |
1817 | ret = req->out.h.error; |
1818 | if (!ret) | |
1819 | ret = size ? req->out.args[0].size : outarg.size; | |
1820 | else { | |
1821 | if (ret == -ENOSYS) { | |
1822 | fc->no_listxattr = 1; | |
1823 | ret = -EOPNOTSUPP; | |
1824 | } | |
1825 | } | |
1826 | fuse_put_request(fc, req); | |
1827 | return ret; | |
1828 | } | |
1829 | ||
1830 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1831 | { | |
1832 | struct inode *inode = entry->d_inode; | |
1833 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1834 | struct fuse_req *req; | |
1835 | int err; | |
1836 | ||
1837 | if (fc->no_removexattr) | |
1838 | return -EOPNOTSUPP; | |
1839 | ||
b111c8c0 | 1840 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
1841 | if (IS_ERR(req)) |
1842 | return PTR_ERR(req); | |
92a8780e MS |
1843 | |
1844 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1845 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1846 | req->in.numargs = 1; |
1847 | req->in.args[0].size = strlen(name) + 1; | |
1848 | req->in.args[0].value = name; | |
b93f858a | 1849 | fuse_request_send(fc, req); |
92a8780e MS |
1850 | err = req->out.h.error; |
1851 | fuse_put_request(fc, req); | |
1852 | if (err == -ENOSYS) { | |
1853 | fc->no_removexattr = 1; | |
1854 | err = -EOPNOTSUPP; | |
1855 | } | |
1856 | return err; | |
1857 | } | |
1858 | ||
754661f1 | 1859 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1860 | .lookup = fuse_lookup, |
9e6268db MS |
1861 | .mkdir = fuse_mkdir, |
1862 | .symlink = fuse_symlink, | |
1863 | .unlink = fuse_unlink, | |
1864 | .rmdir = fuse_rmdir, | |
1865 | .rename = fuse_rename, | |
1866 | .link = fuse_link, | |
1867 | .setattr = fuse_setattr, | |
1868 | .create = fuse_create, | |
c8ccbe03 | 1869 | .atomic_open = fuse_atomic_open, |
9e6268db | 1870 | .mknod = fuse_mknod, |
e5e5558e MS |
1871 | .permission = fuse_permission, |
1872 | .getattr = fuse_getattr, | |
92a8780e MS |
1873 | .setxattr = fuse_setxattr, |
1874 | .getxattr = fuse_getxattr, | |
1875 | .listxattr = fuse_listxattr, | |
1876 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1877 | }; |
1878 | ||
4b6f5d20 | 1879 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1880 | .llseek = generic_file_llseek, |
e5e5558e MS |
1881 | .read = generic_read_dir, |
1882 | .readdir = fuse_readdir, | |
1883 | .open = fuse_dir_open, | |
1884 | .release = fuse_dir_release, | |
82547981 | 1885 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1886 | .unlocked_ioctl = fuse_dir_ioctl, |
1887 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1888 | }; |
1889 | ||
754661f1 | 1890 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1891 | .setattr = fuse_setattr, |
e5e5558e MS |
1892 | .permission = fuse_permission, |
1893 | .getattr = fuse_getattr, | |
92a8780e MS |
1894 | .setxattr = fuse_setxattr, |
1895 | .getxattr = fuse_getxattr, | |
1896 | .listxattr = fuse_listxattr, | |
1897 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1898 | }; |
1899 | ||
754661f1 | 1900 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1901 | .setattr = fuse_setattr, |
e5e5558e MS |
1902 | .follow_link = fuse_follow_link, |
1903 | .put_link = fuse_put_link, | |
1904 | .readlink = generic_readlink, | |
1905 | .getattr = fuse_getattr, | |
92a8780e MS |
1906 | .setxattr = fuse_setxattr, |
1907 | .getxattr = fuse_getxattr, | |
1908 | .listxattr = fuse_listxattr, | |
1909 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1910 | }; |
1911 | ||
1912 | void fuse_init_common(struct inode *inode) | |
1913 | { | |
1914 | inode->i_op = &fuse_common_inode_operations; | |
1915 | } | |
1916 | ||
1917 | void fuse_init_dir(struct inode *inode) | |
1918 | { | |
1919 | inode->i_op = &fuse_dir_inode_operations; | |
1920 | inode->i_fop = &fuse_dir_operations; | |
1921 | } | |
1922 | ||
1923 | void fuse_init_symlink(struct inode *inode) | |
1924 | { | |
1925 | inode->i_op = &fuse_symlink_inode_operations; | |
1926 | } |