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Commit | Line | Data |
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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> | |
13 | #include <linux/gfp.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/namei.h> | |
16 | ||
0a0898cf MS |
17 | #if BITS_PER_LONG >= 64 |
18 | static inline void fuse_dentry_settime(struct dentry *entry, u64 time) | |
19 | { | |
20 | entry->d_time = time; | |
21 | } | |
22 | ||
23 | static inline u64 fuse_dentry_time(struct dentry *entry) | |
24 | { | |
25 | return entry->d_time; | |
26 | } | |
27 | #else | |
28 | /* | |
29 | * On 32 bit archs store the high 32 bits of time in d_fsdata | |
30 | */ | |
31 | static void fuse_dentry_settime(struct dentry *entry, u64 time) | |
32 | { | |
33 | entry->d_time = time; | |
34 | entry->d_fsdata = (void *) (unsigned long) (time >> 32); | |
35 | } | |
36 | ||
37 | static u64 fuse_dentry_time(struct dentry *entry) | |
38 | { | |
39 | return (u64) entry->d_time + | |
40 | ((u64) (unsigned long) entry->d_fsdata << 32); | |
41 | } | |
42 | #endif | |
43 | ||
6f9f1180 MS |
44 | /* |
45 | * FUSE caches dentries and attributes with separate timeout. The | |
46 | * time in jiffies until the dentry/attributes are valid is stored in | |
47 | * dentry->d_time and fuse_inode->i_time respectively. | |
48 | */ | |
49 | ||
50 | /* | |
51 | * Calculate the time in jiffies until a dentry/attributes are valid | |
52 | */ | |
0a0898cf | 53 | static u64 time_to_jiffies(unsigned long sec, unsigned long nsec) |
e5e5558e | 54 | { |
685d16dd MS |
55 | if (sec || nsec) { |
56 | struct timespec ts = {sec, nsec}; | |
0a0898cf | 57 | return get_jiffies_64() + timespec_to_jiffies(&ts); |
685d16dd | 58 | } else |
0a0898cf | 59 | return 0; |
e5e5558e MS |
60 | } |
61 | ||
6f9f1180 MS |
62 | /* |
63 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
64 | * replies | |
65 | */ | |
1fb69e78 MS |
66 | static void fuse_change_entry_timeout(struct dentry *entry, |
67 | struct fuse_entry_out *o) | |
0aa7c699 | 68 | { |
0a0898cf MS |
69 | fuse_dentry_settime(entry, |
70 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
1fb69e78 MS |
71 | } |
72 | ||
73 | static u64 attr_timeout(struct fuse_attr_out *o) | |
74 | { | |
75 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
76 | } | |
77 | ||
78 | static u64 entry_attr_timeout(struct fuse_entry_out *o) | |
79 | { | |
80 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
8cbdf1e6 MS |
81 | } |
82 | ||
6f9f1180 MS |
83 | /* |
84 | * Mark the attributes as stale, so that at the next call to | |
85 | * ->getattr() they will be fetched from userspace | |
86 | */ | |
8cbdf1e6 MS |
87 | void fuse_invalidate_attr(struct inode *inode) |
88 | { | |
0a0898cf | 89 | get_fuse_inode(inode)->i_time = 0; |
8cbdf1e6 MS |
90 | } |
91 | ||
6f9f1180 MS |
92 | /* |
93 | * Just mark the entry as stale, so that a next attempt to look it up | |
94 | * will result in a new lookup call to userspace | |
95 | * | |
96 | * This is called when a dentry is about to become negative and the | |
97 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
98 | * lookup) | |
99 | */ | |
dbd561d2 | 100 | void fuse_invalidate_entry_cache(struct dentry *entry) |
8cbdf1e6 | 101 | { |
0a0898cf | 102 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
103 | } |
104 | ||
6f9f1180 MS |
105 | /* |
106 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
107 | * dentry from the hash | |
108 | */ | |
8cbdf1e6 MS |
109 | static void fuse_invalidate_entry(struct dentry *entry) |
110 | { | |
111 | d_invalidate(entry); | |
112 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
113 | } |
114 | ||
c180eebe MS |
115 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_req *req, |
116 | u64 nodeid, struct qstr *name, | |
e5e5558e MS |
117 | struct fuse_entry_out *outarg) |
118 | { | |
0e9663ee | 119 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
e5e5558e | 120 | req->in.h.opcode = FUSE_LOOKUP; |
c180eebe | 121 | req->in.h.nodeid = nodeid; |
e5e5558e | 122 | req->in.numargs = 1; |
c180eebe MS |
123 | req->in.args[0].size = name->len + 1; |
124 | req->in.args[0].value = name->name; | |
e5e5558e | 125 | req->out.numargs = 1; |
0e9663ee MS |
126 | if (fc->minor < 9) |
127 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
128 | else | |
129 | req->out.args[0].size = sizeof(struct fuse_entry_out); | |
e5e5558e MS |
130 | req->out.args[0].value = outarg; |
131 | } | |
132 | ||
5c5c5e51 | 133 | u64 fuse_get_attr_version(struct fuse_conn *fc) |
7dca9fd3 MS |
134 | { |
135 | u64 curr_version; | |
136 | ||
137 | /* | |
138 | * The spin lock isn't actually needed on 64bit archs, but we | |
139 | * don't yet care too much about such optimizations. | |
140 | */ | |
141 | spin_lock(&fc->lock); | |
142 | curr_version = fc->attr_version; | |
143 | spin_unlock(&fc->lock); | |
144 | ||
145 | return curr_version; | |
146 | } | |
147 | ||
6f9f1180 MS |
148 | /* |
149 | * Check whether the dentry is still valid | |
150 | * | |
151 | * If the entry validity timeout has expired and the dentry is | |
152 | * positive, try to redo the lookup. If the lookup results in a | |
153 | * different inode, then let the VFS invalidate the dentry and redo | |
154 | * the lookup once more. If the lookup results in the same inode, | |
155 | * then refresh the attributes, timeouts and mark the dentry valid. | |
156 | */ | |
e5e5558e MS |
157 | static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd) |
158 | { | |
8cbdf1e6 MS |
159 | struct inode *inode = entry->d_inode; |
160 | ||
161 | if (inode && is_bad_inode(inode)) | |
e5e5558e | 162 | return 0; |
0a0898cf | 163 | else if (fuse_dentry_time(entry) < get_jiffies_64()) { |
e5e5558e | 164 | int err; |
e5e5558e | 165 | struct fuse_entry_out outarg; |
8cbdf1e6 MS |
166 | struct fuse_conn *fc; |
167 | struct fuse_req *req; | |
2d51013e | 168 | struct fuse_req *forget_req; |
e956edd0 | 169 | struct dentry *parent; |
1fb69e78 | 170 | u64 attr_version; |
8cbdf1e6 | 171 | |
50322fe7 | 172 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 MS |
173 | if (!inode) |
174 | return 0; | |
175 | ||
176 | fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
177 | req = fuse_get_req(fc); |
178 | if (IS_ERR(req)) | |
e5e5558e MS |
179 | return 0; |
180 | ||
2d51013e MS |
181 | forget_req = fuse_get_req(fc); |
182 | if (IS_ERR(forget_req)) { | |
183 | fuse_put_request(fc, req); | |
184 | return 0; | |
185 | } | |
186 | ||
7dca9fd3 | 187 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 188 | |
e956edd0 | 189 | parent = dget_parent(entry); |
c180eebe MS |
190 | fuse_lookup_init(fc, req, get_node_id(parent->d_inode), |
191 | &entry->d_name, &outarg); | |
b93f858a | 192 | fuse_request_send(fc, req); |
e956edd0 | 193 | dput(parent); |
e5e5558e | 194 | err = req->out.h.error; |
2d51013e | 195 | fuse_put_request(fc, req); |
50322fe7 MS |
196 | /* Zero nodeid is same as -ENOENT */ |
197 | if (!err && !outarg.nodeid) | |
198 | err = -ENOENT; | |
9e6268db | 199 | if (!err) { |
8cbdf1e6 | 200 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 201 | if (outarg.nodeid != get_node_id(inode)) { |
2d51013e MS |
202 | fuse_send_forget(fc, forget_req, |
203 | outarg.nodeid, 1); | |
9e6268db MS |
204 | return 0; |
205 | } | |
8da5ff23 | 206 | spin_lock(&fc->lock); |
1729a16c | 207 | fi->nlookup++; |
8da5ff23 | 208 | spin_unlock(&fc->lock); |
9e6268db | 209 | } |
2d51013e | 210 | fuse_put_request(fc, forget_req); |
9e6268db | 211 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
212 | return 0; |
213 | ||
1fb69e78 MS |
214 | fuse_change_attributes(inode, &outarg.attr, |
215 | entry_attr_timeout(&outarg), | |
216 | attr_version); | |
217 | fuse_change_entry_timeout(entry, &outarg); | |
e5e5558e MS |
218 | } |
219 | return 1; | |
220 | } | |
221 | ||
8bfc016d | 222 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
223 | { |
224 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
225 | } | |
226 | ||
4269590a | 227 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e MS |
228 | .d_revalidate = fuse_dentry_revalidate, |
229 | }; | |
230 | ||
a5bfffac | 231 | int fuse_valid_type(int m) |
39ee059a MS |
232 | { |
233 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
234 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
235 | } | |
236 | ||
d2a85164 MS |
237 | /* |
238 | * Add a directory inode to a dentry, ensuring that no other dentry | |
239 | * refers to this inode. Called with fc->inst_mutex. | |
240 | */ | |
0de6256d MS |
241 | static struct dentry *fuse_d_add_directory(struct dentry *entry, |
242 | struct inode *inode) | |
d2a85164 MS |
243 | { |
244 | struct dentry *alias = d_find_alias(inode); | |
0de6256d | 245 | if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) { |
d2a85164 MS |
246 | /* This tries to shrink the subtree below alias */ |
247 | fuse_invalidate_entry(alias); | |
248 | dput(alias); | |
249 | if (!list_empty(&inode->i_dentry)) | |
0de6256d MS |
250 | return ERR_PTR(-EBUSY); |
251 | } else { | |
252 | dput(alias); | |
d2a85164 | 253 | } |
0de6256d | 254 | return d_splice_alias(inode, entry); |
d2a85164 MS |
255 | } |
256 | ||
c180eebe MS |
257 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, |
258 | struct fuse_entry_out *outarg, struct inode **inode) | |
e5e5558e | 259 | { |
c180eebe | 260 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
e5e5558e | 261 | struct fuse_req *req; |
2d51013e | 262 | struct fuse_req *forget_req; |
1fb69e78 | 263 | u64 attr_version; |
c180eebe | 264 | int err; |
e5e5558e | 265 | |
c180eebe MS |
266 | *inode = NULL; |
267 | err = -ENAMETOOLONG; | |
268 | if (name->len > FUSE_NAME_MAX) | |
269 | goto out; | |
e5e5558e | 270 | |
ce1d5a49 | 271 | req = fuse_get_req(fc); |
c180eebe | 272 | err = PTR_ERR(req); |
ce1d5a49 | 273 | if (IS_ERR(req)) |
c180eebe | 274 | goto out; |
e5e5558e | 275 | |
2d51013e | 276 | forget_req = fuse_get_req(fc); |
c180eebe | 277 | err = PTR_ERR(forget_req); |
2d51013e MS |
278 | if (IS_ERR(forget_req)) { |
279 | fuse_put_request(fc, req); | |
c180eebe | 280 | goto out; |
2d51013e MS |
281 | } |
282 | ||
7dca9fd3 | 283 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 284 | |
c180eebe | 285 | fuse_lookup_init(fc, req, nodeid, name, outarg); |
b93f858a | 286 | fuse_request_send(fc, req); |
e5e5558e | 287 | err = req->out.h.error; |
2d51013e | 288 | fuse_put_request(fc, req); |
50322fe7 | 289 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
290 | if (err || !outarg->nodeid) |
291 | goto out_put_forget; | |
292 | ||
293 | err = -EIO; | |
294 | if (!outarg->nodeid) | |
295 | goto out_put_forget; | |
296 | if (!fuse_valid_type(outarg->attr.mode)) | |
297 | goto out_put_forget; | |
298 | ||
299 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
300 | &outarg->attr, entry_attr_timeout(outarg), | |
301 | attr_version); | |
302 | err = -ENOMEM; | |
303 | if (!*inode) { | |
304 | fuse_send_forget(fc, forget_req, outarg->nodeid, 1); | |
305 | goto out; | |
e5e5558e | 306 | } |
c180eebe MS |
307 | err = 0; |
308 | ||
309 | out_put_forget: | |
2d51013e | 310 | fuse_put_request(fc, forget_req); |
c180eebe MS |
311 | out: |
312 | return err; | |
313 | } | |
314 | ||
315 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
316 | struct nameidata *nd) | |
317 | { | |
318 | int err; | |
319 | struct fuse_entry_out outarg; | |
320 | struct inode *inode; | |
321 | struct dentry *newent; | |
322 | struct fuse_conn *fc = get_fuse_conn(dir); | |
323 | bool outarg_valid = true; | |
324 | ||
325 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, | |
326 | &outarg, &inode); | |
327 | if (err == -ENOENT) { | |
328 | outarg_valid = false; | |
329 | err = 0; | |
330 | } | |
331 | if (err) | |
332 | goto out_err; | |
333 | ||
334 | err = -EIO; | |
335 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
336 | goto out_iput; | |
e5e5558e | 337 | |
d2a85164 MS |
338 | if (inode && S_ISDIR(inode->i_mode)) { |
339 | mutex_lock(&fc->inst_mutex); | |
0de6256d | 340 | newent = fuse_d_add_directory(entry, inode); |
d2a85164 | 341 | mutex_unlock(&fc->inst_mutex); |
c180eebe MS |
342 | err = PTR_ERR(newent); |
343 | if (IS_ERR(newent)) | |
344 | goto out_iput; | |
345 | } else { | |
0de6256d | 346 | newent = d_splice_alias(inode, entry); |
c180eebe | 347 | } |
d2a85164 | 348 | |
0de6256d | 349 | entry = newent ? newent : entry; |
e5e5558e | 350 | entry->d_op = &fuse_dentry_operations; |
c180eebe | 351 | if (outarg_valid) |
1fb69e78 | 352 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
353 | else |
354 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 355 | |
0de6256d | 356 | return newent; |
c180eebe MS |
357 | |
358 | out_iput: | |
359 | iput(inode); | |
360 | out_err: | |
361 | return ERR_PTR(err); | |
e5e5558e MS |
362 | } |
363 | ||
6f9f1180 MS |
364 | /* |
365 | * Atomic create+open operation | |
366 | * | |
367 | * If the filesystem doesn't support this, then fall back to separate | |
368 | * 'mknod' + 'open' requests. | |
369 | */ | |
fd72faac MS |
370 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, |
371 | struct nameidata *nd) | |
372 | { | |
373 | int err; | |
374 | struct inode *inode; | |
375 | struct fuse_conn *fc = get_fuse_conn(dir); | |
376 | struct fuse_req *req; | |
51eb01e7 | 377 | struct fuse_req *forget_req; |
e0a43ddc | 378 | struct fuse_create_in inarg; |
fd72faac MS |
379 | struct fuse_open_out outopen; |
380 | struct fuse_entry_out outentry; | |
fd72faac MS |
381 | struct fuse_file *ff; |
382 | struct file *file; | |
383 | int flags = nd->intent.open.flags - 1; | |
384 | ||
fd72faac | 385 | if (fc->no_create) |
ce1d5a49 | 386 | return -ENOSYS; |
fd72faac | 387 | |
51eb01e7 MS |
388 | forget_req = fuse_get_req(fc); |
389 | if (IS_ERR(forget_req)) | |
390 | return PTR_ERR(forget_req); | |
391 | ||
ce1d5a49 | 392 | req = fuse_get_req(fc); |
51eb01e7 | 393 | err = PTR_ERR(req); |
ce1d5a49 | 394 | if (IS_ERR(req)) |
51eb01e7 | 395 | goto out_put_forget_req; |
fd72faac | 396 | |
ce1d5a49 | 397 | err = -ENOMEM; |
acf99433 | 398 | ff = fuse_file_alloc(fc); |
fd72faac MS |
399 | if (!ff) |
400 | goto out_put_request; | |
401 | ||
e0a43ddc MS |
402 | if (!fc->dont_mask) |
403 | mode &= ~current_umask(); | |
404 | ||
fd72faac MS |
405 | flags &= ~O_NOCTTY; |
406 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 407 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
408 | inarg.flags = flags; |
409 | inarg.mode = mode; | |
e0a43ddc | 410 | inarg.umask = current_umask(); |
fd72faac MS |
411 | req->in.h.opcode = FUSE_CREATE; |
412 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac | 413 | req->in.numargs = 2; |
e0a43ddc MS |
414 | req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : |
415 | sizeof(inarg); | |
fd72faac MS |
416 | req->in.args[0].value = &inarg; |
417 | req->in.args[1].size = entry->d_name.len + 1; | |
418 | req->in.args[1].value = entry->d_name.name; | |
419 | req->out.numargs = 2; | |
0e9663ee MS |
420 | if (fc->minor < 9) |
421 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
422 | else | |
423 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
424 | req->out.args[0].value = &outentry; |
425 | req->out.args[1].size = sizeof(outopen); | |
426 | req->out.args[1].value = &outopen; | |
b93f858a | 427 | fuse_request_send(fc, req); |
fd72faac MS |
428 | err = req->out.h.error; |
429 | if (err) { | |
430 | if (err == -ENOSYS) | |
431 | fc->no_create = 1; | |
432 | goto out_free_ff; | |
433 | } | |
434 | ||
435 | err = -EIO; | |
2827d0b2 | 436 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
437 | goto out_free_ff; |
438 | ||
51eb01e7 | 439 | fuse_put_request(fc, req); |
c7b7143c MS |
440 | ff->fh = outopen.fh; |
441 | ff->nodeid = outentry.nodeid; | |
442 | ff->open_flags = outopen.open_flags; | |
fd72faac | 443 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 444 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
445 | if (!inode) { |
446 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 447 | fuse_sync_release(ff, flags); |
51eb01e7 MS |
448 | fuse_send_forget(fc, forget_req, outentry.nodeid, 1); |
449 | return -ENOMEM; | |
fd72faac | 450 | } |
51eb01e7 | 451 | fuse_put_request(fc, forget_req); |
fd72faac | 452 | d_instantiate(entry, inode); |
1fb69e78 | 453 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 454 | fuse_invalidate_attr(dir); |
fd72faac MS |
455 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
456 | if (IS_ERR(file)) { | |
8b0797a4 | 457 | fuse_sync_release(ff, flags); |
fd72faac MS |
458 | return PTR_ERR(file); |
459 | } | |
c7b7143c MS |
460 | file->private_data = fuse_file_get(ff); |
461 | fuse_finish_open(inode, file); | |
fd72faac MS |
462 | return 0; |
463 | ||
464 | out_free_ff: | |
465 | fuse_file_free(ff); | |
466 | out_put_request: | |
467 | fuse_put_request(fc, req); | |
51eb01e7 MS |
468 | out_put_forget_req: |
469 | fuse_put_request(fc, forget_req); | |
fd72faac MS |
470 | return err; |
471 | } | |
472 | ||
6f9f1180 MS |
473 | /* |
474 | * Code shared between mknod, mkdir, symlink and link | |
475 | */ | |
9e6268db MS |
476 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
477 | struct inode *dir, struct dentry *entry, | |
478 | int mode) | |
479 | { | |
480 | struct fuse_entry_out outarg; | |
481 | struct inode *inode; | |
9e6268db | 482 | int err; |
2d51013e MS |
483 | struct fuse_req *forget_req; |
484 | ||
485 | forget_req = fuse_get_req(fc); | |
486 | if (IS_ERR(forget_req)) { | |
487 | fuse_put_request(fc, req); | |
488 | return PTR_ERR(forget_req); | |
489 | } | |
9e6268db | 490 | |
0e9663ee | 491 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 492 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 493 | req->out.numargs = 1; |
0e9663ee MS |
494 | if (fc->minor < 9) |
495 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
496 | else | |
497 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 498 | req->out.args[0].value = &outarg; |
b93f858a | 499 | fuse_request_send(fc, req); |
9e6268db | 500 | err = req->out.h.error; |
2d51013e MS |
501 | fuse_put_request(fc, req); |
502 | if (err) | |
503 | goto out_put_forget_req; | |
504 | ||
39ee059a MS |
505 | err = -EIO; |
506 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 507 | goto out_put_forget_req; |
39ee059a MS |
508 | |
509 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 510 | goto out_put_forget_req; |
39ee059a | 511 | |
9e6268db | 512 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 513 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 514 | if (!inode) { |
2d51013e | 515 | fuse_send_forget(fc, forget_req, outarg.nodeid, 1); |
9e6268db MS |
516 | return -ENOMEM; |
517 | } | |
2d51013e | 518 | fuse_put_request(fc, forget_req); |
9e6268db | 519 | |
d2a85164 MS |
520 | if (S_ISDIR(inode->i_mode)) { |
521 | struct dentry *alias; | |
522 | mutex_lock(&fc->inst_mutex); | |
523 | alias = d_find_alias(inode); | |
524 | if (alias) { | |
525 | /* New directory must have moved since mkdir */ | |
526 | mutex_unlock(&fc->inst_mutex); | |
527 | dput(alias); | |
528 | iput(inode); | |
529 | return -EBUSY; | |
530 | } | |
531 | d_instantiate(entry, inode); | |
532 | mutex_unlock(&fc->inst_mutex); | |
533 | } else | |
534 | d_instantiate(entry, inode); | |
9e6268db | 535 | |
1fb69e78 | 536 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
537 | fuse_invalidate_attr(dir); |
538 | return 0; | |
39ee059a | 539 | |
2d51013e MS |
540 | out_put_forget_req: |
541 | fuse_put_request(fc, forget_req); | |
39ee059a | 542 | return err; |
9e6268db MS |
543 | } |
544 | ||
545 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
546 | dev_t rdev) | |
547 | { | |
548 | struct fuse_mknod_in inarg; | |
549 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
550 | struct fuse_req *req = fuse_get_req(fc); |
551 | if (IS_ERR(req)) | |
552 | return PTR_ERR(req); | |
9e6268db | 553 | |
e0a43ddc MS |
554 | if (!fc->dont_mask) |
555 | mode &= ~current_umask(); | |
556 | ||
9e6268db MS |
557 | memset(&inarg, 0, sizeof(inarg)); |
558 | inarg.mode = mode; | |
559 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 560 | inarg.umask = current_umask(); |
9e6268db MS |
561 | req->in.h.opcode = FUSE_MKNOD; |
562 | req->in.numargs = 2; | |
e0a43ddc MS |
563 | req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : |
564 | sizeof(inarg); | |
9e6268db MS |
565 | req->in.args[0].value = &inarg; |
566 | req->in.args[1].size = entry->d_name.len + 1; | |
567 | req->in.args[1].value = entry->d_name.name; | |
568 | return create_new_entry(fc, req, dir, entry, mode); | |
569 | } | |
570 | ||
571 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
572 | struct nameidata *nd) | |
573 | { | |
b9ba347f | 574 | if (nd && (nd->flags & LOOKUP_OPEN)) { |
fd72faac MS |
575 | int err = fuse_create_open(dir, entry, mode, nd); |
576 | if (err != -ENOSYS) | |
577 | return err; | |
578 | /* Fall back on mknod */ | |
579 | } | |
9e6268db MS |
580 | return fuse_mknod(dir, entry, mode, 0); |
581 | } | |
582 | ||
583 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
584 | { | |
585 | struct fuse_mkdir_in inarg; | |
586 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
587 | struct fuse_req *req = fuse_get_req(fc); |
588 | if (IS_ERR(req)) | |
589 | return PTR_ERR(req); | |
9e6268db | 590 | |
e0a43ddc MS |
591 | if (!fc->dont_mask) |
592 | mode &= ~current_umask(); | |
593 | ||
9e6268db MS |
594 | memset(&inarg, 0, sizeof(inarg)); |
595 | inarg.mode = mode; | |
e0a43ddc | 596 | inarg.umask = current_umask(); |
9e6268db MS |
597 | req->in.h.opcode = FUSE_MKDIR; |
598 | req->in.numargs = 2; | |
599 | req->in.args[0].size = sizeof(inarg); | |
600 | req->in.args[0].value = &inarg; | |
601 | req->in.args[1].size = entry->d_name.len + 1; | |
602 | req->in.args[1].value = entry->d_name.name; | |
603 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
604 | } | |
605 | ||
606 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
607 | const char *link) | |
608 | { | |
609 | struct fuse_conn *fc = get_fuse_conn(dir); | |
610 | unsigned len = strlen(link) + 1; | |
ce1d5a49 MS |
611 | struct fuse_req *req = fuse_get_req(fc); |
612 | if (IS_ERR(req)) | |
613 | return PTR_ERR(req); | |
9e6268db MS |
614 | |
615 | req->in.h.opcode = FUSE_SYMLINK; | |
616 | req->in.numargs = 2; | |
617 | req->in.args[0].size = entry->d_name.len + 1; | |
618 | req->in.args[0].value = entry->d_name.name; | |
619 | req->in.args[1].size = len; | |
620 | req->in.args[1].value = link; | |
621 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
622 | } | |
623 | ||
624 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
625 | { | |
626 | int err; | |
627 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
628 | struct fuse_req *req = fuse_get_req(fc); |
629 | if (IS_ERR(req)) | |
630 | return PTR_ERR(req); | |
9e6268db MS |
631 | |
632 | req->in.h.opcode = FUSE_UNLINK; | |
633 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
634 | req->in.numargs = 1; |
635 | req->in.args[0].size = entry->d_name.len + 1; | |
636 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 637 | fuse_request_send(fc, req); |
9e6268db MS |
638 | err = req->out.h.error; |
639 | fuse_put_request(fc, req); | |
640 | if (!err) { | |
641 | struct inode *inode = entry->d_inode; | |
642 | ||
1729a16c MS |
643 | /* |
644 | * Set nlink to zero so the inode can be cleared, if the inode | |
645 | * does have more links this will be discovered at the next | |
646 | * lookup/getattr. | |
647 | */ | |
ce71ec36 | 648 | clear_nlink(inode); |
9e6268db MS |
649 | fuse_invalidate_attr(inode); |
650 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 651 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
652 | } else if (err == -EINTR) |
653 | fuse_invalidate_entry(entry); | |
654 | return err; | |
655 | } | |
656 | ||
657 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
658 | { | |
659 | int err; | |
660 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
661 | struct fuse_req *req = fuse_get_req(fc); |
662 | if (IS_ERR(req)) | |
663 | return PTR_ERR(req); | |
9e6268db MS |
664 | |
665 | req->in.h.opcode = FUSE_RMDIR; | |
666 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
667 | req->in.numargs = 1; |
668 | req->in.args[0].size = entry->d_name.len + 1; | |
669 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 670 | fuse_request_send(fc, req); |
9e6268db MS |
671 | err = req->out.h.error; |
672 | fuse_put_request(fc, req); | |
673 | if (!err) { | |
ce71ec36 | 674 | clear_nlink(entry->d_inode); |
9e6268db | 675 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 676 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
677 | } else if (err == -EINTR) |
678 | fuse_invalidate_entry(entry); | |
679 | return err; | |
680 | } | |
681 | ||
682 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
683 | struct inode *newdir, struct dentry *newent) | |
684 | { | |
685 | int err; | |
686 | struct fuse_rename_in inarg; | |
687 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 MS |
688 | struct fuse_req *req = fuse_get_req(fc); |
689 | if (IS_ERR(req)) | |
690 | return PTR_ERR(req); | |
9e6268db MS |
691 | |
692 | memset(&inarg, 0, sizeof(inarg)); | |
693 | inarg.newdir = get_node_id(newdir); | |
694 | req->in.h.opcode = FUSE_RENAME; | |
695 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
696 | req->in.numargs = 3; |
697 | req->in.args[0].size = sizeof(inarg); | |
698 | req->in.args[0].value = &inarg; | |
699 | req->in.args[1].size = oldent->d_name.len + 1; | |
700 | req->in.args[1].value = oldent->d_name.name; | |
701 | req->in.args[2].size = newent->d_name.len + 1; | |
702 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 703 | fuse_request_send(fc, req); |
9e6268db MS |
704 | err = req->out.h.error; |
705 | fuse_put_request(fc, req); | |
706 | if (!err) { | |
08b63307 MS |
707 | /* ctime changes */ |
708 | fuse_invalidate_attr(oldent->d_inode); | |
709 | ||
9e6268db MS |
710 | fuse_invalidate_attr(olddir); |
711 | if (olddir != newdir) | |
712 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
713 | |
714 | /* newent will end up negative */ | |
715 | if (newent->d_inode) | |
716 | fuse_invalidate_entry_cache(newent); | |
9e6268db MS |
717 | } else if (err == -EINTR) { |
718 | /* If request was interrupted, DEITY only knows if the | |
719 | rename actually took place. If the invalidation | |
720 | fails (e.g. some process has CWD under the renamed | |
721 | directory), then there can be inconsistency between | |
722 | the dcache and the real filesystem. Tough luck. */ | |
723 | fuse_invalidate_entry(oldent); | |
724 | if (newent->d_inode) | |
725 | fuse_invalidate_entry(newent); | |
726 | } | |
727 | ||
728 | return err; | |
729 | } | |
730 | ||
731 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
732 | struct dentry *newent) | |
733 | { | |
734 | int err; | |
735 | struct fuse_link_in inarg; | |
736 | struct inode *inode = entry->d_inode; | |
737 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
738 | struct fuse_req *req = fuse_get_req(fc); |
739 | if (IS_ERR(req)) | |
740 | return PTR_ERR(req); | |
9e6268db MS |
741 | |
742 | memset(&inarg, 0, sizeof(inarg)); | |
743 | inarg.oldnodeid = get_node_id(inode); | |
744 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
745 | req->in.numargs = 2; |
746 | req->in.args[0].size = sizeof(inarg); | |
747 | req->in.args[0].value = &inarg; | |
748 | req->in.args[1].size = newent->d_name.len + 1; | |
749 | req->in.args[1].value = newent->d_name.name; | |
750 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
751 | /* Contrary to "normal" filesystems it can happen that link | |
752 | makes two "logical" inodes point to the same "physical" | |
753 | inode. We invalidate the attributes of the old one, so it | |
754 | will reflect changes in the backing inode (link count, | |
755 | etc.) | |
756 | */ | |
757 | if (!err || err == -EINTR) | |
758 | fuse_invalidate_attr(inode); | |
759 | return err; | |
760 | } | |
761 | ||
1fb69e78 MS |
762 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
763 | struct kstat *stat) | |
764 | { | |
765 | stat->dev = inode->i_sb->s_dev; | |
766 | stat->ino = attr->ino; | |
767 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
768 | stat->nlink = attr->nlink; | |
769 | stat->uid = attr->uid; | |
770 | stat->gid = attr->gid; | |
771 | stat->rdev = inode->i_rdev; | |
772 | stat->atime.tv_sec = attr->atime; | |
773 | stat->atime.tv_nsec = attr->atimensec; | |
774 | stat->mtime.tv_sec = attr->mtime; | |
775 | stat->mtime.tv_nsec = attr->mtimensec; | |
776 | stat->ctime.tv_sec = attr->ctime; | |
777 | stat->ctime.tv_nsec = attr->ctimensec; | |
778 | stat->size = attr->size; | |
779 | stat->blocks = attr->blocks; | |
780 | stat->blksize = (1 << inode->i_blkbits); | |
781 | } | |
782 | ||
c79e322f MS |
783 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
784 | struct file *file) | |
e5e5558e MS |
785 | { |
786 | int err; | |
c79e322f MS |
787 | struct fuse_getattr_in inarg; |
788 | struct fuse_attr_out outarg; | |
e5e5558e | 789 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
790 | struct fuse_req *req; |
791 | u64 attr_version; | |
792 | ||
793 | req = fuse_get_req(fc); | |
ce1d5a49 MS |
794 | if (IS_ERR(req)) |
795 | return PTR_ERR(req); | |
e5e5558e | 796 | |
7dca9fd3 | 797 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 798 | |
c79e322f | 799 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 800 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
801 | /* Directories have separate file-handle space */ |
802 | if (file && S_ISREG(inode->i_mode)) { | |
803 | struct fuse_file *ff = file->private_data; | |
804 | ||
805 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
806 | inarg.fh = ff->fh; | |
807 | } | |
e5e5558e MS |
808 | req->in.h.opcode = FUSE_GETATTR; |
809 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
810 | req->in.numargs = 1; |
811 | req->in.args[0].size = sizeof(inarg); | |
812 | req->in.args[0].value = &inarg; | |
e5e5558e | 813 | req->out.numargs = 1; |
0e9663ee MS |
814 | if (fc->minor < 9) |
815 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
816 | else | |
817 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 818 | req->out.args[0].value = &outarg; |
b93f858a | 819 | fuse_request_send(fc, req); |
e5e5558e MS |
820 | err = req->out.h.error; |
821 | fuse_put_request(fc, req); | |
822 | if (!err) { | |
c79e322f | 823 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
824 | make_bad_inode(inode); |
825 | err = -EIO; | |
826 | } else { | |
c79e322f MS |
827 | fuse_change_attributes(inode, &outarg.attr, |
828 | attr_timeout(&outarg), | |
1fb69e78 MS |
829 | attr_version); |
830 | if (stat) | |
c79e322f | 831 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
832 | } |
833 | } | |
834 | return err; | |
835 | } | |
836 | ||
bcb4be80 MS |
837 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
838 | struct file *file, bool *refreshed) | |
839 | { | |
840 | struct fuse_inode *fi = get_fuse_inode(inode); | |
841 | int err; | |
842 | bool r; | |
843 | ||
844 | if (fi->i_time < get_jiffies_64()) { | |
845 | r = true; | |
846 | err = fuse_do_getattr(inode, stat, file); | |
847 | } else { | |
848 | r = false; | |
849 | err = 0; | |
850 | if (stat) { | |
851 | generic_fillattr(inode, stat); | |
852 | stat->mode = fi->orig_i_mode; | |
853 | } | |
854 | } | |
855 | ||
856 | if (refreshed != NULL) | |
857 | *refreshed = r; | |
858 | ||
859 | return err; | |
860 | } | |
861 | ||
3b463ae0 JM |
862 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
863 | struct qstr *name) | |
864 | { | |
865 | int err = -ENOTDIR; | |
866 | struct inode *parent; | |
867 | struct dentry *dir; | |
868 | struct dentry *entry; | |
869 | ||
870 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
871 | if (!parent) | |
872 | return -ENOENT; | |
873 | ||
874 | mutex_lock(&parent->i_mutex); | |
875 | if (!S_ISDIR(parent->i_mode)) | |
876 | goto unlock; | |
877 | ||
878 | err = -ENOENT; | |
879 | dir = d_find_alias(parent); | |
880 | if (!dir) | |
881 | goto unlock; | |
882 | ||
883 | entry = d_lookup(dir, name); | |
884 | dput(dir); | |
885 | if (!entry) | |
886 | goto unlock; | |
887 | ||
888 | fuse_invalidate_attr(parent); | |
889 | fuse_invalidate_entry(entry); | |
890 | dput(entry); | |
891 | err = 0; | |
892 | ||
893 | unlock: | |
894 | mutex_unlock(&parent->i_mutex); | |
895 | iput(parent); | |
896 | return err; | |
897 | } | |
898 | ||
87729a55 MS |
899 | /* |
900 | * Calling into a user-controlled filesystem gives the filesystem | |
901 | * daemon ptrace-like capabilities over the requester process. This | |
902 | * means, that the filesystem daemon is able to record the exact | |
903 | * filesystem operations performed, and can also control the behavior | |
904 | * of the requester process in otherwise impossible ways. For example | |
905 | * it can delay the operation for arbitrary length of time allowing | |
906 | * DoS against the requester. | |
907 | * | |
908 | * For this reason only those processes can call into the filesystem, | |
909 | * for which the owner of the mount has ptrace privilege. This | |
910 | * excludes processes started by other users, suid or sgid processes. | |
911 | */ | |
e57ac683 | 912 | int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) |
87729a55 | 913 | { |
c69e8d9c DH |
914 | const struct cred *cred; |
915 | int ret; | |
87729a55 | 916 | |
c69e8d9c | 917 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
918 | return 1; |
919 | ||
c69e8d9c DH |
920 | rcu_read_lock(); |
921 | ret = 0; | |
922 | cred = __task_cred(task); | |
923 | if (cred->euid == fc->user_id && | |
924 | cred->suid == fc->user_id && | |
925 | cred->uid == fc->user_id && | |
926 | cred->egid == fc->group_id && | |
927 | cred->sgid == fc->group_id && | |
928 | cred->gid == fc->group_id) | |
929 | ret = 1; | |
930 | rcu_read_unlock(); | |
931 | ||
932 | return ret; | |
87729a55 MS |
933 | } |
934 | ||
31d40d74 MS |
935 | static int fuse_access(struct inode *inode, int mask) |
936 | { | |
937 | struct fuse_conn *fc = get_fuse_conn(inode); | |
938 | struct fuse_req *req; | |
939 | struct fuse_access_in inarg; | |
940 | int err; | |
941 | ||
942 | if (fc->no_access) | |
943 | return 0; | |
944 | ||
ce1d5a49 MS |
945 | req = fuse_get_req(fc); |
946 | if (IS_ERR(req)) | |
947 | return PTR_ERR(req); | |
31d40d74 MS |
948 | |
949 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 950 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
951 | req->in.h.opcode = FUSE_ACCESS; |
952 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
953 | req->in.numargs = 1; |
954 | req->in.args[0].size = sizeof(inarg); | |
955 | req->in.args[0].value = &inarg; | |
b93f858a | 956 | fuse_request_send(fc, req); |
31d40d74 MS |
957 | err = req->out.h.error; |
958 | fuse_put_request(fc, req); | |
959 | if (err == -ENOSYS) { | |
960 | fc->no_access = 1; | |
961 | err = 0; | |
962 | } | |
963 | return err; | |
964 | } | |
965 | ||
6f9f1180 MS |
966 | /* |
967 | * Check permission. The two basic access models of FUSE are: | |
968 | * | |
969 | * 1) Local access checking ('default_permissions' mount option) based | |
970 | * on file mode. This is the plain old disk filesystem permission | |
971 | * modell. | |
972 | * | |
973 | * 2) "Remote" access checking, where server is responsible for | |
974 | * checking permission in each inode operation. An exception to this | |
975 | * is if ->permission() was invoked from sys_access() in which case an | |
976 | * access request is sent. Execute permission is still checked | |
977 | * locally based on file mode. | |
978 | */ | |
e6305c43 | 979 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
980 | { |
981 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
982 | bool refreshed = false; |
983 | int err = 0; | |
e5e5558e | 984 | |
87729a55 | 985 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 986 | return -EACCES; |
244f6385 MS |
987 | |
988 | /* | |
e8e96157 | 989 | * If attributes are needed, refresh them before proceeding |
244f6385 | 990 | */ |
e8e96157 MS |
991 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
992 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
bcb4be80 MS |
993 | err = fuse_update_attributes(inode, NULL, NULL, &refreshed); |
994 | if (err) | |
995 | return err; | |
244f6385 MS |
996 | } |
997 | ||
998 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
1a823ac9 | 999 | err = generic_permission(inode, mask, NULL); |
1e9a4ed9 MS |
1000 | |
1001 | /* If permission is denied, try to refresh file | |
1002 | attributes. This is also needed, because the root | |
1003 | node will at first have no permissions */ | |
244f6385 | 1004 | if (err == -EACCES && !refreshed) { |
c79e322f | 1005 | err = fuse_do_getattr(inode, NULL, NULL); |
1e9a4ed9 MS |
1006 | if (!err) |
1007 | err = generic_permission(inode, mask, NULL); | |
1008 | } | |
1009 | ||
6f9f1180 MS |
1010 | /* Note: the opposite of the above test does not |
1011 | exist. So if permissions are revoked this won't be | |
1012 | noticed immediately, only after the attribute | |
1013 | timeout has expired */ | |
a110343f | 1014 | } else if (mask & MAY_ACCESS) { |
e8e96157 MS |
1015 | err = fuse_access(inode, mask); |
1016 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1017 | if (!(inode->i_mode & S_IXUGO)) { | |
1018 | if (refreshed) | |
1019 | return -EACCES; | |
1020 | ||
c79e322f | 1021 | err = fuse_do_getattr(inode, NULL, NULL); |
e8e96157 MS |
1022 | if (!err && !(inode->i_mode & S_IXUGO)) |
1023 | return -EACCES; | |
1024 | } | |
e5e5558e | 1025 | } |
244f6385 | 1026 | return err; |
e5e5558e MS |
1027 | } |
1028 | ||
1029 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
1030 | void *dstbuf, filldir_t filldir) | |
1031 | { | |
1032 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1033 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1034 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
1035 | int over; | |
1036 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1037 | return -EIO; | |
1038 | if (reclen > nbytes) | |
1039 | break; | |
1040 | ||
1041 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
1042 | file->f_pos, dirent->ino, dirent->type); | |
1043 | if (over) | |
1044 | break; | |
1045 | ||
1046 | buf += reclen; | |
1047 | nbytes -= reclen; | |
1048 | file->f_pos = dirent->off; | |
1049 | } | |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
04730fef | 1054 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 1055 | { |
04730fef MS |
1056 | int err; |
1057 | size_t nbytes; | |
1058 | struct page *page; | |
7706a9d6 | 1059 | struct inode *inode = file->f_path.dentry->d_inode; |
e5e5558e | 1060 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 MS |
1061 | struct fuse_req *req; |
1062 | ||
1063 | if (is_bad_inode(inode)) | |
1064 | return -EIO; | |
1065 | ||
ce1d5a49 MS |
1066 | req = fuse_get_req(fc); |
1067 | if (IS_ERR(req)) | |
1068 | return PTR_ERR(req); | |
e5e5558e | 1069 | |
04730fef MS |
1070 | page = alloc_page(GFP_KERNEL); |
1071 | if (!page) { | |
1072 | fuse_put_request(fc, req); | |
1073 | return -ENOMEM; | |
1074 | } | |
f4975c67 | 1075 | req->out.argpages = 1; |
04730fef MS |
1076 | req->num_pages = 1; |
1077 | req->pages[0] = page; | |
2106cb18 | 1078 | fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
b93f858a | 1079 | fuse_request_send(fc, req); |
361b1eb5 | 1080 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1081 | err = req->out.h.error; |
1082 | fuse_put_request(fc, req); | |
1083 | if (!err) | |
04730fef MS |
1084 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
1085 | filldir); | |
e5e5558e | 1086 | |
04730fef | 1087 | __free_page(page); |
b36c31ba | 1088 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 1089 | return err; |
e5e5558e MS |
1090 | } |
1091 | ||
1092 | static char *read_link(struct dentry *dentry) | |
1093 | { | |
1094 | struct inode *inode = dentry->d_inode; | |
1095 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 1096 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
1097 | char *link; |
1098 | ||
ce1d5a49 | 1099 | if (IS_ERR(req)) |
e231c2ee | 1100 | return ERR_CAST(req); |
e5e5558e MS |
1101 | |
1102 | link = (char *) __get_free_page(GFP_KERNEL); | |
1103 | if (!link) { | |
1104 | link = ERR_PTR(-ENOMEM); | |
1105 | goto out; | |
1106 | } | |
1107 | req->in.h.opcode = FUSE_READLINK; | |
1108 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1109 | req->out.argvar = 1; |
1110 | req->out.numargs = 1; | |
1111 | req->out.args[0].size = PAGE_SIZE - 1; | |
1112 | req->out.args[0].value = link; | |
b93f858a | 1113 | fuse_request_send(fc, req); |
e5e5558e MS |
1114 | if (req->out.h.error) { |
1115 | free_page((unsigned long) link); | |
1116 | link = ERR_PTR(req->out.h.error); | |
1117 | } else | |
1118 | link[req->out.args[0].size] = '\0'; | |
1119 | out: | |
1120 | fuse_put_request(fc, req); | |
b36c31ba | 1121 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
1122 | return link; |
1123 | } | |
1124 | ||
1125 | static void free_link(char *link) | |
1126 | { | |
1127 | if (!IS_ERR(link)) | |
1128 | free_page((unsigned long) link); | |
1129 | } | |
1130 | ||
1131 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1132 | { | |
1133 | nd_set_link(nd, read_link(dentry)); | |
1134 | return NULL; | |
1135 | } | |
1136 | ||
1137 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1138 | { | |
1139 | free_link(nd_get_link(nd)); | |
1140 | } | |
1141 | ||
1142 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1143 | { | |
91fe96b4 | 1144 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1145 | } |
1146 | ||
1147 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1148 | { | |
8b0797a4 MS |
1149 | fuse_release_common(file, FUSE_RELEASEDIR); |
1150 | ||
1151 | return 0; | |
e5e5558e MS |
1152 | } |
1153 | ||
82547981 MS |
1154 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) |
1155 | { | |
1156 | /* nfsd can call this with no file */ | |
1157 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; | |
1158 | } | |
1159 | ||
17637cba MS |
1160 | static bool update_mtime(unsigned ivalid) |
1161 | { | |
1162 | /* Always update if mtime is explicitly set */ | |
1163 | if (ivalid & ATTR_MTIME_SET) | |
1164 | return true; | |
1165 | ||
1166 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ | |
1167 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1168 | return false; | |
1169 | ||
1170 | /* In all other cases update */ | |
1171 | return true; | |
1172 | } | |
1173 | ||
befc649c | 1174 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
1175 | { |
1176 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1177 | |
1178 | if (ivalid & ATTR_MODE) | |
befc649c | 1179 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1180 | if (ivalid & ATTR_UID) |
befc649c | 1181 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 1182 | if (ivalid & ATTR_GID) |
befc649c | 1183 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 1184 | if (ivalid & ATTR_SIZE) |
befc649c | 1185 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1186 | if (ivalid & ATTR_ATIME) { |
1187 | arg->valid |= FATTR_ATIME; | |
befc649c | 1188 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1189 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1190 | if (!(ivalid & ATTR_ATIME_SET)) | |
1191 | arg->valid |= FATTR_ATIME_NOW; | |
1192 | } | |
1193 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) { | |
1194 | arg->valid |= FATTR_MTIME; | |
befc649c | 1195 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba MS |
1196 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
1197 | if (!(ivalid & ATTR_MTIME_SET)) | |
1198 | arg->valid |= FATTR_MTIME_NOW; | |
befc649c | 1199 | } |
9e6268db MS |
1200 | } |
1201 | ||
3be5a52b MS |
1202 | /* |
1203 | * Prevent concurrent writepages on inode | |
1204 | * | |
1205 | * This is done by adding a negative bias to the inode write counter | |
1206 | * and waiting for all pending writes to finish. | |
1207 | */ | |
1208 | void fuse_set_nowrite(struct inode *inode) | |
1209 | { | |
1210 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1211 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1212 | ||
1213 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1214 | ||
1215 | spin_lock(&fc->lock); | |
1216 | BUG_ON(fi->writectr < 0); | |
1217 | fi->writectr += FUSE_NOWRITE; | |
1218 | spin_unlock(&fc->lock); | |
1219 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Allow writepages on inode | |
1224 | * | |
1225 | * Remove the bias from the writecounter and send any queued | |
1226 | * writepages. | |
1227 | */ | |
1228 | static void __fuse_release_nowrite(struct inode *inode) | |
1229 | { | |
1230 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1231 | ||
1232 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1233 | fi->writectr = 0; | |
1234 | fuse_flush_writepages(inode); | |
1235 | } | |
1236 | ||
1237 | void fuse_release_nowrite(struct inode *inode) | |
1238 | { | |
1239 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1240 | ||
1241 | spin_lock(&fc->lock); | |
1242 | __fuse_release_nowrite(inode); | |
1243 | spin_unlock(&fc->lock); | |
1244 | } | |
1245 | ||
6f9f1180 MS |
1246 | /* |
1247 | * Set attributes, and at the same time refresh them. | |
1248 | * | |
1249 | * Truncation is slightly complicated, because the 'truncate' request | |
1250 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1251 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1252 | * and the actual truncation by hand. | |
6f9f1180 | 1253 | */ |
49d4914f MS |
1254 | static int fuse_do_setattr(struct dentry *entry, struct iattr *attr, |
1255 | struct file *file) | |
9e6268db MS |
1256 | { |
1257 | struct inode *inode = entry->d_inode; | |
1258 | struct fuse_conn *fc = get_fuse_conn(inode); | |
9e6268db MS |
1259 | struct fuse_req *req; |
1260 | struct fuse_setattr_in inarg; | |
1261 | struct fuse_attr_out outarg; | |
3be5a52b MS |
1262 | bool is_truncate = false; |
1263 | loff_t oldsize; | |
9e6268db | 1264 | int err; |
9e6268db | 1265 | |
e57ac683 MS |
1266 | if (!fuse_allow_task(fc, current)) |
1267 | return -EACCES; | |
1268 | ||
1e9a4ed9 MS |
1269 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
1270 | err = inode_change_ok(inode, attr); | |
1271 | if (err) | |
1272 | return err; | |
1273 | } | |
1274 | ||
6ff958ed MS |
1275 | if ((attr->ia_valid & ATTR_OPEN) && fc->atomic_o_trunc) |
1276 | return 0; | |
1277 | ||
9e6268db | 1278 | if (attr->ia_valid & ATTR_SIZE) { |
c08d3b0e | 1279 | err = inode_newsize_ok(inode, attr->ia_size); |
1280 | if (err) | |
1281 | return err; | |
3be5a52b | 1282 | is_truncate = true; |
9e6268db MS |
1283 | } |
1284 | ||
ce1d5a49 MS |
1285 | req = fuse_get_req(fc); |
1286 | if (IS_ERR(req)) | |
1287 | return PTR_ERR(req); | |
9e6268db | 1288 | |
3be5a52b MS |
1289 | if (is_truncate) |
1290 | fuse_set_nowrite(inode); | |
1291 | ||
9e6268db | 1292 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1293 | memset(&outarg, 0, sizeof(outarg)); |
befc649c | 1294 | iattr_to_fattr(attr, &inarg); |
49d4914f MS |
1295 | if (file) { |
1296 | struct fuse_file *ff = file->private_data; | |
1297 | inarg.valid |= FATTR_FH; | |
1298 | inarg.fh = ff->fh; | |
1299 | } | |
f3332114 MS |
1300 | if (attr->ia_valid & ATTR_SIZE) { |
1301 | /* For mandatory locking in truncate */ | |
1302 | inarg.valid |= FATTR_LOCKOWNER; | |
1303 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1304 | } | |
9e6268db MS |
1305 | req->in.h.opcode = FUSE_SETATTR; |
1306 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1307 | req->in.numargs = 1; |
1308 | req->in.args[0].size = sizeof(inarg); | |
1309 | req->in.args[0].value = &inarg; | |
1310 | req->out.numargs = 1; | |
0e9663ee MS |
1311 | if (fc->minor < 9) |
1312 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1313 | else | |
1314 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 1315 | req->out.args[0].value = &outarg; |
b93f858a | 1316 | fuse_request_send(fc, req); |
9e6268db MS |
1317 | err = req->out.h.error; |
1318 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1319 | if (err) { |
1320 | if (err == -EINTR) | |
1321 | fuse_invalidate_attr(inode); | |
3be5a52b | 1322 | goto error; |
e00d2c2d | 1323 | } |
9e6268db | 1324 | |
e00d2c2d MS |
1325 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1326 | make_bad_inode(inode); | |
3be5a52b MS |
1327 | err = -EIO; |
1328 | goto error; | |
1329 | } | |
1330 | ||
1331 | spin_lock(&fc->lock); | |
1332 | fuse_change_attributes_common(inode, &outarg.attr, | |
1333 | attr_timeout(&outarg)); | |
1334 | oldsize = inode->i_size; | |
1335 | i_size_write(inode, outarg.attr.size); | |
1336 | ||
1337 | if (is_truncate) { | |
1338 | /* NOTE: this may release/reacquire fc->lock */ | |
1339 | __fuse_release_nowrite(inode); | |
1340 | } | |
1341 | spin_unlock(&fc->lock); | |
1342 | ||
1343 | /* | |
1344 | * Only call invalidate_inode_pages2() after removing | |
1345 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1346 | */ | |
1347 | if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
c08d3b0e | 1348 | truncate_pagecache(inode, oldsize, outarg.attr.size); |
3be5a52b | 1349 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1350 | } |
1351 | ||
e00d2c2d | 1352 | return 0; |
3be5a52b MS |
1353 | |
1354 | error: | |
1355 | if (is_truncate) | |
1356 | fuse_release_nowrite(inode); | |
1357 | ||
1358 | return err; | |
9e6268db MS |
1359 | } |
1360 | ||
49d4914f MS |
1361 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1362 | { | |
1363 | if (attr->ia_valid & ATTR_FILE) | |
1364 | return fuse_do_setattr(entry, attr, attr->ia_file); | |
1365 | else | |
1366 | return fuse_do_setattr(entry, attr, NULL); | |
1367 | } | |
1368 | ||
e5e5558e MS |
1369 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1370 | struct kstat *stat) | |
1371 | { | |
1372 | struct inode *inode = entry->d_inode; | |
244f6385 | 1373 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 MS |
1374 | |
1375 | if (!fuse_allow_task(fc, current)) | |
1376 | return -EACCES; | |
1377 | ||
bcb4be80 | 1378 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1379 | } |
1380 | ||
92a8780e MS |
1381 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1382 | const void *value, size_t size, int flags) | |
1383 | { | |
1384 | struct inode *inode = entry->d_inode; | |
1385 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1386 | struct fuse_req *req; | |
1387 | struct fuse_setxattr_in inarg; | |
1388 | int err; | |
1389 | ||
92a8780e MS |
1390 | if (fc->no_setxattr) |
1391 | return -EOPNOTSUPP; | |
1392 | ||
ce1d5a49 MS |
1393 | req = fuse_get_req(fc); |
1394 | if (IS_ERR(req)) | |
1395 | return PTR_ERR(req); | |
92a8780e MS |
1396 | |
1397 | memset(&inarg, 0, sizeof(inarg)); | |
1398 | inarg.size = size; | |
1399 | inarg.flags = flags; | |
1400 | req->in.h.opcode = FUSE_SETXATTR; | |
1401 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1402 | req->in.numargs = 3; |
1403 | req->in.args[0].size = sizeof(inarg); | |
1404 | req->in.args[0].value = &inarg; | |
1405 | req->in.args[1].size = strlen(name) + 1; | |
1406 | req->in.args[1].value = name; | |
1407 | req->in.args[2].size = size; | |
1408 | req->in.args[2].value = value; | |
b93f858a | 1409 | fuse_request_send(fc, req); |
92a8780e MS |
1410 | err = req->out.h.error; |
1411 | fuse_put_request(fc, req); | |
1412 | if (err == -ENOSYS) { | |
1413 | fc->no_setxattr = 1; | |
1414 | err = -EOPNOTSUPP; | |
1415 | } | |
1416 | return err; | |
1417 | } | |
1418 | ||
1419 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1420 | void *value, size_t size) | |
1421 | { | |
1422 | struct inode *inode = entry->d_inode; | |
1423 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1424 | struct fuse_req *req; | |
1425 | struct fuse_getxattr_in inarg; | |
1426 | struct fuse_getxattr_out outarg; | |
1427 | ssize_t ret; | |
1428 | ||
1429 | if (fc->no_getxattr) | |
1430 | return -EOPNOTSUPP; | |
1431 | ||
ce1d5a49 MS |
1432 | req = fuse_get_req(fc); |
1433 | if (IS_ERR(req)) | |
1434 | return PTR_ERR(req); | |
92a8780e MS |
1435 | |
1436 | memset(&inarg, 0, sizeof(inarg)); | |
1437 | inarg.size = size; | |
1438 | req->in.h.opcode = FUSE_GETXATTR; | |
1439 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1440 | req->in.numargs = 2; |
1441 | req->in.args[0].size = sizeof(inarg); | |
1442 | req->in.args[0].value = &inarg; | |
1443 | req->in.args[1].size = strlen(name) + 1; | |
1444 | req->in.args[1].value = name; | |
1445 | /* This is really two different operations rolled into one */ | |
1446 | req->out.numargs = 1; | |
1447 | if (size) { | |
1448 | req->out.argvar = 1; | |
1449 | req->out.args[0].size = size; | |
1450 | req->out.args[0].value = value; | |
1451 | } else { | |
1452 | req->out.args[0].size = sizeof(outarg); | |
1453 | req->out.args[0].value = &outarg; | |
1454 | } | |
b93f858a | 1455 | fuse_request_send(fc, req); |
92a8780e MS |
1456 | ret = req->out.h.error; |
1457 | if (!ret) | |
1458 | ret = size ? req->out.args[0].size : outarg.size; | |
1459 | else { | |
1460 | if (ret == -ENOSYS) { | |
1461 | fc->no_getxattr = 1; | |
1462 | ret = -EOPNOTSUPP; | |
1463 | } | |
1464 | } | |
1465 | fuse_put_request(fc, req); | |
1466 | return ret; | |
1467 | } | |
1468 | ||
1469 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1470 | { | |
1471 | struct inode *inode = entry->d_inode; | |
1472 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1473 | struct fuse_req *req; | |
1474 | struct fuse_getxattr_in inarg; | |
1475 | struct fuse_getxattr_out outarg; | |
1476 | ssize_t ret; | |
1477 | ||
e57ac683 MS |
1478 | if (!fuse_allow_task(fc, current)) |
1479 | return -EACCES; | |
1480 | ||
92a8780e MS |
1481 | if (fc->no_listxattr) |
1482 | return -EOPNOTSUPP; | |
1483 | ||
ce1d5a49 MS |
1484 | req = fuse_get_req(fc); |
1485 | if (IS_ERR(req)) | |
1486 | return PTR_ERR(req); | |
92a8780e MS |
1487 | |
1488 | memset(&inarg, 0, sizeof(inarg)); | |
1489 | inarg.size = size; | |
1490 | req->in.h.opcode = FUSE_LISTXATTR; | |
1491 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1492 | req->in.numargs = 1; |
1493 | req->in.args[0].size = sizeof(inarg); | |
1494 | req->in.args[0].value = &inarg; | |
1495 | /* This is really two different operations rolled into one */ | |
1496 | req->out.numargs = 1; | |
1497 | if (size) { | |
1498 | req->out.argvar = 1; | |
1499 | req->out.args[0].size = size; | |
1500 | req->out.args[0].value = list; | |
1501 | } else { | |
1502 | req->out.args[0].size = sizeof(outarg); | |
1503 | req->out.args[0].value = &outarg; | |
1504 | } | |
b93f858a | 1505 | fuse_request_send(fc, req); |
92a8780e MS |
1506 | ret = req->out.h.error; |
1507 | if (!ret) | |
1508 | ret = size ? req->out.args[0].size : outarg.size; | |
1509 | else { | |
1510 | if (ret == -ENOSYS) { | |
1511 | fc->no_listxattr = 1; | |
1512 | ret = -EOPNOTSUPP; | |
1513 | } | |
1514 | } | |
1515 | fuse_put_request(fc, req); | |
1516 | return ret; | |
1517 | } | |
1518 | ||
1519 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1520 | { | |
1521 | struct inode *inode = entry->d_inode; | |
1522 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1523 | struct fuse_req *req; | |
1524 | int err; | |
1525 | ||
1526 | if (fc->no_removexattr) | |
1527 | return -EOPNOTSUPP; | |
1528 | ||
ce1d5a49 MS |
1529 | req = fuse_get_req(fc); |
1530 | if (IS_ERR(req)) | |
1531 | return PTR_ERR(req); | |
92a8780e MS |
1532 | |
1533 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1534 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1535 | req->in.numargs = 1; |
1536 | req->in.args[0].size = strlen(name) + 1; | |
1537 | req->in.args[0].value = name; | |
b93f858a | 1538 | fuse_request_send(fc, req); |
92a8780e MS |
1539 | err = req->out.h.error; |
1540 | fuse_put_request(fc, req); | |
1541 | if (err == -ENOSYS) { | |
1542 | fc->no_removexattr = 1; | |
1543 | err = -EOPNOTSUPP; | |
1544 | } | |
1545 | return err; | |
1546 | } | |
1547 | ||
754661f1 | 1548 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1549 | .lookup = fuse_lookup, |
9e6268db MS |
1550 | .mkdir = fuse_mkdir, |
1551 | .symlink = fuse_symlink, | |
1552 | .unlink = fuse_unlink, | |
1553 | .rmdir = fuse_rmdir, | |
1554 | .rename = fuse_rename, | |
1555 | .link = fuse_link, | |
1556 | .setattr = fuse_setattr, | |
1557 | .create = fuse_create, | |
1558 | .mknod = fuse_mknod, | |
e5e5558e MS |
1559 | .permission = fuse_permission, |
1560 | .getattr = fuse_getattr, | |
92a8780e MS |
1561 | .setxattr = fuse_setxattr, |
1562 | .getxattr = fuse_getxattr, | |
1563 | .listxattr = fuse_listxattr, | |
1564 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1565 | }; |
1566 | ||
4b6f5d20 | 1567 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1568 | .llseek = generic_file_llseek, |
e5e5558e MS |
1569 | .read = generic_read_dir, |
1570 | .readdir = fuse_readdir, | |
1571 | .open = fuse_dir_open, | |
1572 | .release = fuse_dir_release, | |
82547981 | 1573 | .fsync = fuse_dir_fsync, |
e5e5558e MS |
1574 | }; |
1575 | ||
754661f1 | 1576 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1577 | .setattr = fuse_setattr, |
e5e5558e MS |
1578 | .permission = fuse_permission, |
1579 | .getattr = fuse_getattr, | |
92a8780e MS |
1580 | .setxattr = fuse_setxattr, |
1581 | .getxattr = fuse_getxattr, | |
1582 | .listxattr = fuse_listxattr, | |
1583 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1584 | }; |
1585 | ||
754661f1 | 1586 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1587 | .setattr = fuse_setattr, |
e5e5558e MS |
1588 | .follow_link = fuse_follow_link, |
1589 | .put_link = fuse_put_link, | |
1590 | .readlink = generic_readlink, | |
1591 | .getattr = fuse_getattr, | |
92a8780e MS |
1592 | .setxattr = fuse_setxattr, |
1593 | .getxattr = fuse_getxattr, | |
1594 | .listxattr = fuse_listxattr, | |
1595 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1596 | }; |
1597 | ||
1598 | void fuse_init_common(struct inode *inode) | |
1599 | { | |
1600 | inode->i_op = &fuse_common_inode_operations; | |
1601 | } | |
1602 | ||
1603 | void fuse_init_dir(struct inode *inode) | |
1604 | { | |
1605 | inode->i_op = &fuse_dir_inode_operations; | |
1606 | inode->i_fop = &fuse_dir_operations; | |
1607 | } | |
1608 | ||
1609 | void fuse_init_symlink(struct inode *inode) | |
1610 | { | |
1611 | inode->i_op = &fuse_symlink_inode_operations; | |
1612 | } |