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> | |
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 | { | |
34286d66 | 159 | struct inode *inode; |
8cbdf1e6 | 160 | |
34286d66 NP |
161 | if (nd->flags & LOOKUP_RCU) |
162 | return -ECHILD; | |
163 | ||
164 | inode = entry->d_inode; | |
8cbdf1e6 | 165 | if (inode && is_bad_inode(inode)) |
e5e5558e | 166 | return 0; |
0a0898cf | 167 | else if (fuse_dentry_time(entry) < get_jiffies_64()) { |
e5e5558e | 168 | int err; |
e5e5558e | 169 | struct fuse_entry_out outarg; |
8cbdf1e6 MS |
170 | struct fuse_conn *fc; |
171 | struct fuse_req *req; | |
2d51013e | 172 | struct fuse_req *forget_req; |
e956edd0 | 173 | struct dentry *parent; |
1fb69e78 | 174 | u64 attr_version; |
8cbdf1e6 | 175 | |
50322fe7 | 176 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 MS |
177 | if (!inode) |
178 | return 0; | |
179 | ||
180 | fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
181 | req = fuse_get_req(fc); |
182 | if (IS_ERR(req)) | |
e5e5558e MS |
183 | return 0; |
184 | ||
2d51013e MS |
185 | forget_req = fuse_get_req(fc); |
186 | if (IS_ERR(forget_req)) { | |
187 | fuse_put_request(fc, req); | |
188 | return 0; | |
189 | } | |
190 | ||
7dca9fd3 | 191 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 192 | |
e956edd0 | 193 | parent = dget_parent(entry); |
c180eebe MS |
194 | fuse_lookup_init(fc, req, get_node_id(parent->d_inode), |
195 | &entry->d_name, &outarg); | |
b93f858a | 196 | fuse_request_send(fc, req); |
e956edd0 | 197 | dput(parent); |
e5e5558e | 198 | err = req->out.h.error; |
2d51013e | 199 | fuse_put_request(fc, req); |
50322fe7 MS |
200 | /* Zero nodeid is same as -ENOENT */ |
201 | if (!err && !outarg.nodeid) | |
202 | err = -ENOENT; | |
9e6268db | 203 | if (!err) { |
8cbdf1e6 | 204 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 205 | if (outarg.nodeid != get_node_id(inode)) { |
2d51013e MS |
206 | fuse_send_forget(fc, forget_req, |
207 | outarg.nodeid, 1); | |
9e6268db MS |
208 | return 0; |
209 | } | |
8da5ff23 | 210 | spin_lock(&fc->lock); |
1729a16c | 211 | fi->nlookup++; |
8da5ff23 | 212 | spin_unlock(&fc->lock); |
9e6268db | 213 | } |
2d51013e | 214 | fuse_put_request(fc, forget_req); |
9e6268db | 215 | if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) |
e5e5558e MS |
216 | return 0; |
217 | ||
1fb69e78 MS |
218 | fuse_change_attributes(inode, &outarg.attr, |
219 | entry_attr_timeout(&outarg), | |
220 | attr_version); | |
221 | fuse_change_entry_timeout(entry, &outarg); | |
e5e5558e MS |
222 | } |
223 | return 1; | |
224 | } | |
225 | ||
8bfc016d | 226 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
227 | { |
228 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
229 | } | |
230 | ||
4269590a | 231 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e MS |
232 | .d_revalidate = fuse_dentry_revalidate, |
233 | }; | |
234 | ||
a5bfffac | 235 | int fuse_valid_type(int m) |
39ee059a MS |
236 | { |
237 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
238 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
239 | } | |
240 | ||
d2a85164 MS |
241 | /* |
242 | * Add a directory inode to a dentry, ensuring that no other dentry | |
243 | * refers to this inode. Called with fc->inst_mutex. | |
244 | */ | |
0de6256d MS |
245 | static struct dentry *fuse_d_add_directory(struct dentry *entry, |
246 | struct inode *inode) | |
d2a85164 MS |
247 | { |
248 | struct dentry *alias = d_find_alias(inode); | |
0de6256d | 249 | if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) { |
d2a85164 MS |
250 | /* This tries to shrink the subtree below alias */ |
251 | fuse_invalidate_entry(alias); | |
252 | dput(alias); | |
253 | if (!list_empty(&inode->i_dentry)) | |
0de6256d MS |
254 | return ERR_PTR(-EBUSY); |
255 | } else { | |
256 | dput(alias); | |
d2a85164 | 257 | } |
0de6256d | 258 | return d_splice_alias(inode, entry); |
d2a85164 MS |
259 | } |
260 | ||
c180eebe MS |
261 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, |
262 | struct fuse_entry_out *outarg, struct inode **inode) | |
e5e5558e | 263 | { |
c180eebe | 264 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
e5e5558e | 265 | struct fuse_req *req; |
2d51013e | 266 | struct fuse_req *forget_req; |
1fb69e78 | 267 | u64 attr_version; |
c180eebe | 268 | int err; |
e5e5558e | 269 | |
c180eebe MS |
270 | *inode = NULL; |
271 | err = -ENAMETOOLONG; | |
272 | if (name->len > FUSE_NAME_MAX) | |
273 | goto out; | |
e5e5558e | 274 | |
ce1d5a49 | 275 | req = fuse_get_req(fc); |
c180eebe | 276 | err = PTR_ERR(req); |
ce1d5a49 | 277 | if (IS_ERR(req)) |
c180eebe | 278 | goto out; |
e5e5558e | 279 | |
2d51013e | 280 | forget_req = fuse_get_req(fc); |
c180eebe | 281 | err = PTR_ERR(forget_req); |
2d51013e MS |
282 | if (IS_ERR(forget_req)) { |
283 | fuse_put_request(fc, req); | |
c180eebe | 284 | goto out; |
2d51013e MS |
285 | } |
286 | ||
7dca9fd3 | 287 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 288 | |
c180eebe | 289 | fuse_lookup_init(fc, req, nodeid, name, outarg); |
b93f858a | 290 | fuse_request_send(fc, req); |
e5e5558e | 291 | err = req->out.h.error; |
2d51013e | 292 | fuse_put_request(fc, req); |
50322fe7 | 293 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
294 | if (err || !outarg->nodeid) |
295 | goto out_put_forget; | |
296 | ||
297 | err = -EIO; | |
298 | if (!outarg->nodeid) | |
299 | goto out_put_forget; | |
300 | if (!fuse_valid_type(outarg->attr.mode)) | |
301 | goto out_put_forget; | |
302 | ||
303 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
304 | &outarg->attr, entry_attr_timeout(outarg), | |
305 | attr_version); | |
306 | err = -ENOMEM; | |
307 | if (!*inode) { | |
308 | fuse_send_forget(fc, forget_req, outarg->nodeid, 1); | |
309 | goto out; | |
e5e5558e | 310 | } |
c180eebe MS |
311 | err = 0; |
312 | ||
313 | out_put_forget: | |
2d51013e | 314 | fuse_put_request(fc, forget_req); |
c180eebe MS |
315 | out: |
316 | return err; | |
317 | } | |
318 | ||
319 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
320 | struct nameidata *nd) | |
321 | { | |
322 | int err; | |
323 | struct fuse_entry_out outarg; | |
324 | struct inode *inode; | |
325 | struct dentry *newent; | |
326 | struct fuse_conn *fc = get_fuse_conn(dir); | |
327 | bool outarg_valid = true; | |
328 | ||
329 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, | |
330 | &outarg, &inode); | |
331 | if (err == -ENOENT) { | |
332 | outarg_valid = false; | |
333 | err = 0; | |
334 | } | |
335 | if (err) | |
336 | goto out_err; | |
337 | ||
338 | err = -EIO; | |
339 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
340 | goto out_iput; | |
e5e5558e | 341 | |
d2a85164 MS |
342 | if (inode && S_ISDIR(inode->i_mode)) { |
343 | mutex_lock(&fc->inst_mutex); | |
0de6256d | 344 | newent = fuse_d_add_directory(entry, inode); |
d2a85164 | 345 | mutex_unlock(&fc->inst_mutex); |
c180eebe MS |
346 | err = PTR_ERR(newent); |
347 | if (IS_ERR(newent)) | |
348 | goto out_iput; | |
349 | } else { | |
0de6256d | 350 | newent = d_splice_alias(inode, entry); |
c180eebe | 351 | } |
d2a85164 | 352 | |
0de6256d | 353 | entry = newent ? newent : entry; |
fb045adb | 354 | d_set_d_op(entry, &fuse_dentry_operations); |
c180eebe | 355 | if (outarg_valid) |
1fb69e78 | 356 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
357 | else |
358 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 359 | |
0de6256d | 360 | return newent; |
c180eebe MS |
361 | |
362 | out_iput: | |
363 | iput(inode); | |
364 | out_err: | |
365 | return ERR_PTR(err); | |
e5e5558e MS |
366 | } |
367 | ||
6f9f1180 MS |
368 | /* |
369 | * Atomic create+open operation | |
370 | * | |
371 | * If the filesystem doesn't support this, then fall back to separate | |
372 | * 'mknod' + 'open' requests. | |
373 | */ | |
fd72faac MS |
374 | static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, |
375 | struct nameidata *nd) | |
376 | { | |
377 | int err; | |
378 | struct inode *inode; | |
379 | struct fuse_conn *fc = get_fuse_conn(dir); | |
380 | struct fuse_req *req; | |
51eb01e7 | 381 | struct fuse_req *forget_req; |
e0a43ddc | 382 | struct fuse_create_in inarg; |
fd72faac MS |
383 | struct fuse_open_out outopen; |
384 | struct fuse_entry_out outentry; | |
fd72faac MS |
385 | struct fuse_file *ff; |
386 | struct file *file; | |
387 | int flags = nd->intent.open.flags - 1; | |
388 | ||
fd72faac | 389 | if (fc->no_create) |
ce1d5a49 | 390 | return -ENOSYS; |
fd72faac | 391 | |
1b732396 CH |
392 | if (flags & O_DIRECT) |
393 | return -EINVAL; | |
394 | ||
51eb01e7 MS |
395 | forget_req = fuse_get_req(fc); |
396 | if (IS_ERR(forget_req)) | |
397 | return PTR_ERR(forget_req); | |
398 | ||
ce1d5a49 | 399 | req = fuse_get_req(fc); |
51eb01e7 | 400 | err = PTR_ERR(req); |
ce1d5a49 | 401 | if (IS_ERR(req)) |
51eb01e7 | 402 | goto out_put_forget_req; |
fd72faac | 403 | |
ce1d5a49 | 404 | err = -ENOMEM; |
acf99433 | 405 | ff = fuse_file_alloc(fc); |
fd72faac MS |
406 | if (!ff) |
407 | goto out_put_request; | |
408 | ||
e0a43ddc MS |
409 | if (!fc->dont_mask) |
410 | mode &= ~current_umask(); | |
411 | ||
fd72faac MS |
412 | flags &= ~O_NOCTTY; |
413 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 414 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
415 | inarg.flags = flags; |
416 | inarg.mode = mode; | |
e0a43ddc | 417 | inarg.umask = current_umask(); |
fd72faac MS |
418 | req->in.h.opcode = FUSE_CREATE; |
419 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac | 420 | req->in.numargs = 2; |
e0a43ddc MS |
421 | req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) : |
422 | sizeof(inarg); | |
fd72faac MS |
423 | req->in.args[0].value = &inarg; |
424 | req->in.args[1].size = entry->d_name.len + 1; | |
425 | req->in.args[1].value = entry->d_name.name; | |
426 | req->out.numargs = 2; | |
0e9663ee MS |
427 | if (fc->minor < 9) |
428 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
429 | else | |
430 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
431 | req->out.args[0].value = &outentry; |
432 | req->out.args[1].size = sizeof(outopen); | |
433 | req->out.args[1].value = &outopen; | |
b93f858a | 434 | fuse_request_send(fc, req); |
fd72faac MS |
435 | err = req->out.h.error; |
436 | if (err) { | |
437 | if (err == -ENOSYS) | |
438 | fc->no_create = 1; | |
439 | goto out_free_ff; | |
440 | } | |
441 | ||
442 | err = -EIO; | |
2827d0b2 | 443 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
444 | goto out_free_ff; |
445 | ||
51eb01e7 | 446 | fuse_put_request(fc, req); |
c7b7143c MS |
447 | ff->fh = outopen.fh; |
448 | ff->nodeid = outentry.nodeid; | |
449 | ff->open_flags = outopen.open_flags; | |
fd72faac | 450 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 451 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
452 | if (!inode) { |
453 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 454 | fuse_sync_release(ff, flags); |
51eb01e7 MS |
455 | fuse_send_forget(fc, forget_req, outentry.nodeid, 1); |
456 | return -ENOMEM; | |
fd72faac | 457 | } |
51eb01e7 | 458 | fuse_put_request(fc, forget_req); |
fd72faac | 459 | d_instantiate(entry, inode); |
1fb69e78 | 460 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 461 | fuse_invalidate_attr(dir); |
fd72faac MS |
462 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
463 | if (IS_ERR(file)) { | |
8b0797a4 | 464 | fuse_sync_release(ff, flags); |
fd72faac MS |
465 | return PTR_ERR(file); |
466 | } | |
c7b7143c MS |
467 | file->private_data = fuse_file_get(ff); |
468 | fuse_finish_open(inode, file); | |
fd72faac MS |
469 | return 0; |
470 | ||
471 | out_free_ff: | |
472 | fuse_file_free(ff); | |
473 | out_put_request: | |
474 | fuse_put_request(fc, req); | |
51eb01e7 MS |
475 | out_put_forget_req: |
476 | fuse_put_request(fc, forget_req); | |
fd72faac MS |
477 | return err; |
478 | } | |
479 | ||
6f9f1180 MS |
480 | /* |
481 | * Code shared between mknod, mkdir, symlink and link | |
482 | */ | |
9e6268db MS |
483 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
484 | struct inode *dir, struct dentry *entry, | |
485 | int mode) | |
486 | { | |
487 | struct fuse_entry_out outarg; | |
488 | struct inode *inode; | |
9e6268db | 489 | int err; |
2d51013e MS |
490 | struct fuse_req *forget_req; |
491 | ||
492 | forget_req = fuse_get_req(fc); | |
493 | if (IS_ERR(forget_req)) { | |
494 | fuse_put_request(fc, req); | |
495 | return PTR_ERR(forget_req); | |
496 | } | |
9e6268db | 497 | |
0e9663ee | 498 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 499 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 500 | req->out.numargs = 1; |
0e9663ee MS |
501 | if (fc->minor < 9) |
502 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
503 | else | |
504 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 505 | req->out.args[0].value = &outarg; |
b93f858a | 506 | fuse_request_send(fc, req); |
9e6268db | 507 | err = req->out.h.error; |
2d51013e MS |
508 | fuse_put_request(fc, req); |
509 | if (err) | |
510 | goto out_put_forget_req; | |
511 | ||
39ee059a MS |
512 | err = -EIO; |
513 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 514 | goto out_put_forget_req; |
39ee059a MS |
515 | |
516 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 517 | goto out_put_forget_req; |
39ee059a | 518 | |
9e6268db | 519 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 520 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 521 | if (!inode) { |
2d51013e | 522 | fuse_send_forget(fc, forget_req, outarg.nodeid, 1); |
9e6268db MS |
523 | return -ENOMEM; |
524 | } | |
2d51013e | 525 | fuse_put_request(fc, forget_req); |
9e6268db | 526 | |
d2a85164 MS |
527 | if (S_ISDIR(inode->i_mode)) { |
528 | struct dentry *alias; | |
529 | mutex_lock(&fc->inst_mutex); | |
530 | alias = d_find_alias(inode); | |
531 | if (alias) { | |
532 | /* New directory must have moved since mkdir */ | |
533 | mutex_unlock(&fc->inst_mutex); | |
534 | dput(alias); | |
535 | iput(inode); | |
536 | return -EBUSY; | |
537 | } | |
538 | d_instantiate(entry, inode); | |
539 | mutex_unlock(&fc->inst_mutex); | |
540 | } else | |
541 | d_instantiate(entry, inode); | |
9e6268db | 542 | |
1fb69e78 | 543 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
544 | fuse_invalidate_attr(dir); |
545 | return 0; | |
39ee059a | 546 | |
2d51013e MS |
547 | out_put_forget_req: |
548 | fuse_put_request(fc, forget_req); | |
39ee059a | 549 | return err; |
9e6268db MS |
550 | } |
551 | ||
552 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
553 | dev_t rdev) | |
554 | { | |
555 | struct fuse_mknod_in inarg; | |
556 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
557 | struct fuse_req *req = fuse_get_req(fc); |
558 | if (IS_ERR(req)) | |
559 | return PTR_ERR(req); | |
9e6268db | 560 | |
e0a43ddc MS |
561 | if (!fc->dont_mask) |
562 | mode &= ~current_umask(); | |
563 | ||
9e6268db MS |
564 | memset(&inarg, 0, sizeof(inarg)); |
565 | inarg.mode = mode; | |
566 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 567 | inarg.umask = current_umask(); |
9e6268db MS |
568 | req->in.h.opcode = FUSE_MKNOD; |
569 | req->in.numargs = 2; | |
e0a43ddc MS |
570 | req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE : |
571 | sizeof(inarg); | |
9e6268db MS |
572 | req->in.args[0].value = &inarg; |
573 | req->in.args[1].size = entry->d_name.len + 1; | |
574 | req->in.args[1].value = entry->d_name.name; | |
575 | return create_new_entry(fc, req, dir, entry, mode); | |
576 | } | |
577 | ||
578 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
579 | struct nameidata *nd) | |
580 | { | |
b9ba347f | 581 | if (nd && (nd->flags & LOOKUP_OPEN)) { |
fd72faac MS |
582 | int err = fuse_create_open(dir, entry, mode, nd); |
583 | if (err != -ENOSYS) | |
584 | return err; | |
585 | /* Fall back on mknod */ | |
586 | } | |
9e6268db MS |
587 | return fuse_mknod(dir, entry, mode, 0); |
588 | } | |
589 | ||
590 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
591 | { | |
592 | struct fuse_mkdir_in inarg; | |
593 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
594 | struct fuse_req *req = fuse_get_req(fc); |
595 | if (IS_ERR(req)) | |
596 | return PTR_ERR(req); | |
9e6268db | 597 | |
e0a43ddc MS |
598 | if (!fc->dont_mask) |
599 | mode &= ~current_umask(); | |
600 | ||
9e6268db MS |
601 | memset(&inarg, 0, sizeof(inarg)); |
602 | inarg.mode = mode; | |
e0a43ddc | 603 | inarg.umask = current_umask(); |
9e6268db MS |
604 | req->in.h.opcode = FUSE_MKDIR; |
605 | req->in.numargs = 2; | |
606 | req->in.args[0].size = sizeof(inarg); | |
607 | req->in.args[0].value = &inarg; | |
608 | req->in.args[1].size = entry->d_name.len + 1; | |
609 | req->in.args[1].value = entry->d_name.name; | |
610 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
611 | } | |
612 | ||
613 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
614 | const char *link) | |
615 | { | |
616 | struct fuse_conn *fc = get_fuse_conn(dir); | |
617 | unsigned len = strlen(link) + 1; | |
ce1d5a49 MS |
618 | struct fuse_req *req = fuse_get_req(fc); |
619 | if (IS_ERR(req)) | |
620 | return PTR_ERR(req); | |
9e6268db MS |
621 | |
622 | req->in.h.opcode = FUSE_SYMLINK; | |
623 | req->in.numargs = 2; | |
624 | req->in.args[0].size = entry->d_name.len + 1; | |
625 | req->in.args[0].value = entry->d_name.name; | |
626 | req->in.args[1].size = len; | |
627 | req->in.args[1].value = link; | |
628 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
629 | } | |
630 | ||
631 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
632 | { | |
633 | int err; | |
634 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
635 | struct fuse_req *req = fuse_get_req(fc); |
636 | if (IS_ERR(req)) | |
637 | return PTR_ERR(req); | |
9e6268db MS |
638 | |
639 | req->in.h.opcode = FUSE_UNLINK; | |
640 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
641 | req->in.numargs = 1; |
642 | req->in.args[0].size = entry->d_name.len + 1; | |
643 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 644 | fuse_request_send(fc, req); |
9e6268db MS |
645 | err = req->out.h.error; |
646 | fuse_put_request(fc, req); | |
647 | if (!err) { | |
648 | struct inode *inode = entry->d_inode; | |
649 | ||
1729a16c MS |
650 | /* |
651 | * Set nlink to zero so the inode can be cleared, if the inode | |
652 | * does have more links this will be discovered at the next | |
653 | * lookup/getattr. | |
654 | */ | |
ce71ec36 | 655 | clear_nlink(inode); |
9e6268db MS |
656 | fuse_invalidate_attr(inode); |
657 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 658 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
659 | } else if (err == -EINTR) |
660 | fuse_invalidate_entry(entry); | |
661 | return err; | |
662 | } | |
663 | ||
664 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
665 | { | |
666 | int err; | |
667 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
668 | struct fuse_req *req = fuse_get_req(fc); |
669 | if (IS_ERR(req)) | |
670 | return PTR_ERR(req); | |
9e6268db MS |
671 | |
672 | req->in.h.opcode = FUSE_RMDIR; | |
673 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
674 | req->in.numargs = 1; |
675 | req->in.args[0].size = entry->d_name.len + 1; | |
676 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 677 | fuse_request_send(fc, req); |
9e6268db MS |
678 | err = req->out.h.error; |
679 | fuse_put_request(fc, req); | |
680 | if (!err) { | |
ce71ec36 | 681 | clear_nlink(entry->d_inode); |
9e6268db | 682 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 683 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
684 | } else if (err == -EINTR) |
685 | fuse_invalidate_entry(entry); | |
686 | return err; | |
687 | } | |
688 | ||
689 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
690 | struct inode *newdir, struct dentry *newent) | |
691 | { | |
692 | int err; | |
693 | struct fuse_rename_in inarg; | |
694 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 MS |
695 | struct fuse_req *req = fuse_get_req(fc); |
696 | if (IS_ERR(req)) | |
697 | return PTR_ERR(req); | |
9e6268db MS |
698 | |
699 | memset(&inarg, 0, sizeof(inarg)); | |
700 | inarg.newdir = get_node_id(newdir); | |
701 | req->in.h.opcode = FUSE_RENAME; | |
702 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
703 | req->in.numargs = 3; |
704 | req->in.args[0].size = sizeof(inarg); | |
705 | req->in.args[0].value = &inarg; | |
706 | req->in.args[1].size = oldent->d_name.len + 1; | |
707 | req->in.args[1].value = oldent->d_name.name; | |
708 | req->in.args[2].size = newent->d_name.len + 1; | |
709 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 710 | fuse_request_send(fc, req); |
9e6268db MS |
711 | err = req->out.h.error; |
712 | fuse_put_request(fc, req); | |
713 | if (!err) { | |
08b63307 MS |
714 | /* ctime changes */ |
715 | fuse_invalidate_attr(oldent->d_inode); | |
716 | ||
9e6268db MS |
717 | fuse_invalidate_attr(olddir); |
718 | if (olddir != newdir) | |
719 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
720 | |
721 | /* newent will end up negative */ | |
5219f346 MS |
722 | if (newent->d_inode) { |
723 | fuse_invalidate_attr(newent->d_inode); | |
8cbdf1e6 | 724 | fuse_invalidate_entry_cache(newent); |
5219f346 | 725 | } |
9e6268db MS |
726 | } else if (err == -EINTR) { |
727 | /* If request was interrupted, DEITY only knows if the | |
728 | rename actually took place. If the invalidation | |
729 | fails (e.g. some process has CWD under the renamed | |
730 | directory), then there can be inconsistency between | |
731 | the dcache and the real filesystem. Tough luck. */ | |
732 | fuse_invalidate_entry(oldent); | |
733 | if (newent->d_inode) | |
734 | fuse_invalidate_entry(newent); | |
735 | } | |
736 | ||
737 | return err; | |
738 | } | |
739 | ||
740 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
741 | struct dentry *newent) | |
742 | { | |
743 | int err; | |
744 | struct fuse_link_in inarg; | |
745 | struct inode *inode = entry->d_inode; | |
746 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
747 | struct fuse_req *req = fuse_get_req(fc); |
748 | if (IS_ERR(req)) | |
749 | return PTR_ERR(req); | |
9e6268db MS |
750 | |
751 | memset(&inarg, 0, sizeof(inarg)); | |
752 | inarg.oldnodeid = get_node_id(inode); | |
753 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
754 | req->in.numargs = 2; |
755 | req->in.args[0].size = sizeof(inarg); | |
756 | req->in.args[0].value = &inarg; | |
757 | req->in.args[1].size = newent->d_name.len + 1; | |
758 | req->in.args[1].value = newent->d_name.name; | |
759 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
760 | /* Contrary to "normal" filesystems it can happen that link | |
761 | makes two "logical" inodes point to the same "physical" | |
762 | inode. We invalidate the attributes of the old one, so it | |
763 | will reflect changes in the backing inode (link count, | |
764 | etc.) | |
765 | */ | |
766 | if (!err || err == -EINTR) | |
767 | fuse_invalidate_attr(inode); | |
768 | return err; | |
769 | } | |
770 | ||
1fb69e78 MS |
771 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
772 | struct kstat *stat) | |
773 | { | |
774 | stat->dev = inode->i_sb->s_dev; | |
775 | stat->ino = attr->ino; | |
776 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
777 | stat->nlink = attr->nlink; | |
778 | stat->uid = attr->uid; | |
779 | stat->gid = attr->gid; | |
780 | stat->rdev = inode->i_rdev; | |
781 | stat->atime.tv_sec = attr->atime; | |
782 | stat->atime.tv_nsec = attr->atimensec; | |
783 | stat->mtime.tv_sec = attr->mtime; | |
784 | stat->mtime.tv_nsec = attr->mtimensec; | |
785 | stat->ctime.tv_sec = attr->ctime; | |
786 | stat->ctime.tv_nsec = attr->ctimensec; | |
787 | stat->size = attr->size; | |
788 | stat->blocks = attr->blocks; | |
789 | stat->blksize = (1 << inode->i_blkbits); | |
790 | } | |
791 | ||
c79e322f MS |
792 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
793 | struct file *file) | |
e5e5558e MS |
794 | { |
795 | int err; | |
c79e322f MS |
796 | struct fuse_getattr_in inarg; |
797 | struct fuse_attr_out outarg; | |
e5e5558e | 798 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
799 | struct fuse_req *req; |
800 | u64 attr_version; | |
801 | ||
802 | req = fuse_get_req(fc); | |
ce1d5a49 MS |
803 | if (IS_ERR(req)) |
804 | return PTR_ERR(req); | |
e5e5558e | 805 | |
7dca9fd3 | 806 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 807 | |
c79e322f | 808 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 809 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
810 | /* Directories have separate file-handle space */ |
811 | if (file && S_ISREG(inode->i_mode)) { | |
812 | struct fuse_file *ff = file->private_data; | |
813 | ||
814 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
815 | inarg.fh = ff->fh; | |
816 | } | |
e5e5558e MS |
817 | req->in.h.opcode = FUSE_GETATTR; |
818 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
819 | req->in.numargs = 1; |
820 | req->in.args[0].size = sizeof(inarg); | |
821 | req->in.args[0].value = &inarg; | |
e5e5558e | 822 | req->out.numargs = 1; |
0e9663ee MS |
823 | if (fc->minor < 9) |
824 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
825 | else | |
826 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 827 | req->out.args[0].value = &outarg; |
b93f858a | 828 | fuse_request_send(fc, req); |
e5e5558e MS |
829 | err = req->out.h.error; |
830 | fuse_put_request(fc, req); | |
831 | if (!err) { | |
c79e322f | 832 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
833 | make_bad_inode(inode); |
834 | err = -EIO; | |
835 | } else { | |
c79e322f MS |
836 | fuse_change_attributes(inode, &outarg.attr, |
837 | attr_timeout(&outarg), | |
1fb69e78 MS |
838 | attr_version); |
839 | if (stat) | |
c79e322f | 840 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
841 | } |
842 | } | |
843 | return err; | |
844 | } | |
845 | ||
bcb4be80 MS |
846 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
847 | struct file *file, bool *refreshed) | |
848 | { | |
849 | struct fuse_inode *fi = get_fuse_inode(inode); | |
850 | int err; | |
851 | bool r; | |
852 | ||
853 | if (fi->i_time < get_jiffies_64()) { | |
854 | r = true; | |
855 | err = fuse_do_getattr(inode, stat, file); | |
856 | } else { | |
857 | r = false; | |
858 | err = 0; | |
859 | if (stat) { | |
860 | generic_fillattr(inode, stat); | |
861 | stat->mode = fi->orig_i_mode; | |
862 | } | |
863 | } | |
864 | ||
865 | if (refreshed != NULL) | |
866 | *refreshed = r; | |
867 | ||
868 | return err; | |
869 | } | |
870 | ||
3b463ae0 JM |
871 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
872 | struct qstr *name) | |
873 | { | |
874 | int err = -ENOTDIR; | |
875 | struct inode *parent; | |
876 | struct dentry *dir; | |
877 | struct dentry *entry; | |
878 | ||
879 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
880 | if (!parent) | |
881 | return -ENOENT; | |
882 | ||
883 | mutex_lock(&parent->i_mutex); | |
884 | if (!S_ISDIR(parent->i_mode)) | |
885 | goto unlock; | |
886 | ||
887 | err = -ENOENT; | |
888 | dir = d_find_alias(parent); | |
889 | if (!dir) | |
890 | goto unlock; | |
891 | ||
892 | entry = d_lookup(dir, name); | |
893 | dput(dir); | |
894 | if (!entry) | |
895 | goto unlock; | |
896 | ||
897 | fuse_invalidate_attr(parent); | |
898 | fuse_invalidate_entry(entry); | |
899 | dput(entry); | |
900 | err = 0; | |
901 | ||
902 | unlock: | |
903 | mutex_unlock(&parent->i_mutex); | |
904 | iput(parent); | |
905 | return err; | |
906 | } | |
907 | ||
87729a55 MS |
908 | /* |
909 | * Calling into a user-controlled filesystem gives the filesystem | |
910 | * daemon ptrace-like capabilities over the requester process. This | |
911 | * means, that the filesystem daemon is able to record the exact | |
912 | * filesystem operations performed, and can also control the behavior | |
913 | * of the requester process in otherwise impossible ways. For example | |
914 | * it can delay the operation for arbitrary length of time allowing | |
915 | * DoS against the requester. | |
916 | * | |
917 | * For this reason only those processes can call into the filesystem, | |
918 | * for which the owner of the mount has ptrace privilege. This | |
919 | * excludes processes started by other users, suid or sgid processes. | |
920 | */ | |
e57ac683 | 921 | int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) |
87729a55 | 922 | { |
c69e8d9c DH |
923 | const struct cred *cred; |
924 | int ret; | |
87729a55 | 925 | |
c69e8d9c | 926 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
927 | return 1; |
928 | ||
c69e8d9c DH |
929 | rcu_read_lock(); |
930 | ret = 0; | |
931 | cred = __task_cred(task); | |
932 | if (cred->euid == fc->user_id && | |
933 | cred->suid == fc->user_id && | |
934 | cred->uid == fc->user_id && | |
935 | cred->egid == fc->group_id && | |
936 | cred->sgid == fc->group_id && | |
937 | cred->gid == fc->group_id) | |
938 | ret = 1; | |
939 | rcu_read_unlock(); | |
940 | ||
941 | return ret; | |
87729a55 MS |
942 | } |
943 | ||
31d40d74 MS |
944 | static int fuse_access(struct inode *inode, int mask) |
945 | { | |
946 | struct fuse_conn *fc = get_fuse_conn(inode); | |
947 | struct fuse_req *req; | |
948 | struct fuse_access_in inarg; | |
949 | int err; | |
950 | ||
951 | if (fc->no_access) | |
952 | return 0; | |
953 | ||
ce1d5a49 MS |
954 | req = fuse_get_req(fc); |
955 | if (IS_ERR(req)) | |
956 | return PTR_ERR(req); | |
31d40d74 MS |
957 | |
958 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 959 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
960 | req->in.h.opcode = FUSE_ACCESS; |
961 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
962 | req->in.numargs = 1; |
963 | req->in.args[0].size = sizeof(inarg); | |
964 | req->in.args[0].value = &inarg; | |
b93f858a | 965 | fuse_request_send(fc, req); |
31d40d74 MS |
966 | err = req->out.h.error; |
967 | fuse_put_request(fc, req); | |
968 | if (err == -ENOSYS) { | |
969 | fc->no_access = 1; | |
970 | err = 0; | |
971 | } | |
972 | return err; | |
973 | } | |
974 | ||
6f9f1180 MS |
975 | /* |
976 | * Check permission. The two basic access models of FUSE are: | |
977 | * | |
978 | * 1) Local access checking ('default_permissions' mount option) based | |
979 | * on file mode. This is the plain old disk filesystem permission | |
980 | * modell. | |
981 | * | |
982 | * 2) "Remote" access checking, where server is responsible for | |
983 | * checking permission in each inode operation. An exception to this | |
984 | * is if ->permission() was invoked from sys_access() in which case an | |
985 | * access request is sent. Execute permission is still checked | |
986 | * locally based on file mode. | |
987 | */ | |
b74c79e9 | 988 | static int fuse_permission(struct inode *inode, int mask, unsigned int flags) |
e5e5558e MS |
989 | { |
990 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
991 | bool refreshed = false; |
992 | int err = 0; | |
e5e5558e | 993 | |
b74c79e9 NP |
994 | if (flags & IPERM_FLAG_RCU) |
995 | return -ECHILD; | |
996 | ||
87729a55 | 997 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 998 | return -EACCES; |
244f6385 MS |
999 | |
1000 | /* | |
e8e96157 | 1001 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1002 | */ |
e8e96157 MS |
1003 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
1004 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
bcb4be80 MS |
1005 | err = fuse_update_attributes(inode, NULL, NULL, &refreshed); |
1006 | if (err) | |
1007 | return err; | |
244f6385 MS |
1008 | } |
1009 | ||
1010 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
b74c79e9 | 1011 | err = generic_permission(inode, mask, flags, NULL); |
1e9a4ed9 MS |
1012 | |
1013 | /* If permission is denied, try to refresh file | |
1014 | attributes. This is also needed, because the root | |
1015 | node will at first have no permissions */ | |
244f6385 | 1016 | if (err == -EACCES && !refreshed) { |
c79e322f | 1017 | err = fuse_do_getattr(inode, NULL, NULL); |
1e9a4ed9 | 1018 | if (!err) |
b74c79e9 NP |
1019 | err = generic_permission(inode, mask, |
1020 | flags, NULL); | |
1e9a4ed9 MS |
1021 | } |
1022 | ||
6f9f1180 MS |
1023 | /* Note: the opposite of the above test does not |
1024 | exist. So if permissions are revoked this won't be | |
1025 | noticed immediately, only after the attribute | |
1026 | timeout has expired */ | |
9cfcac81 | 1027 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1028 | err = fuse_access(inode, mask); |
1029 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1030 | if (!(inode->i_mode & S_IXUGO)) { | |
1031 | if (refreshed) | |
1032 | return -EACCES; | |
1033 | ||
c79e322f | 1034 | err = fuse_do_getattr(inode, NULL, NULL); |
e8e96157 MS |
1035 | if (!err && !(inode->i_mode & S_IXUGO)) |
1036 | return -EACCES; | |
1037 | } | |
e5e5558e | 1038 | } |
244f6385 | 1039 | return err; |
e5e5558e MS |
1040 | } |
1041 | ||
1042 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
1043 | void *dstbuf, filldir_t filldir) | |
1044 | { | |
1045 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1046 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1047 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
1048 | int over; | |
1049 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1050 | return -EIO; | |
1051 | if (reclen > nbytes) | |
1052 | break; | |
1053 | ||
1054 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
1055 | file->f_pos, dirent->ino, dirent->type); | |
1056 | if (over) | |
1057 | break; | |
1058 | ||
1059 | buf += reclen; | |
1060 | nbytes -= reclen; | |
1061 | file->f_pos = dirent->off; | |
1062 | } | |
1063 | ||
1064 | return 0; | |
1065 | } | |
1066 | ||
04730fef | 1067 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 1068 | { |
04730fef MS |
1069 | int err; |
1070 | size_t nbytes; | |
1071 | struct page *page; | |
7706a9d6 | 1072 | struct inode *inode = file->f_path.dentry->d_inode; |
e5e5558e | 1073 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 MS |
1074 | struct fuse_req *req; |
1075 | ||
1076 | if (is_bad_inode(inode)) | |
1077 | return -EIO; | |
1078 | ||
ce1d5a49 MS |
1079 | req = fuse_get_req(fc); |
1080 | if (IS_ERR(req)) | |
1081 | return PTR_ERR(req); | |
e5e5558e | 1082 | |
04730fef MS |
1083 | page = alloc_page(GFP_KERNEL); |
1084 | if (!page) { | |
1085 | fuse_put_request(fc, req); | |
1086 | return -ENOMEM; | |
1087 | } | |
f4975c67 | 1088 | req->out.argpages = 1; |
04730fef MS |
1089 | req->num_pages = 1; |
1090 | req->pages[0] = page; | |
2106cb18 | 1091 | fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
b93f858a | 1092 | fuse_request_send(fc, req); |
361b1eb5 | 1093 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1094 | err = req->out.h.error; |
1095 | fuse_put_request(fc, req); | |
1096 | if (!err) | |
04730fef MS |
1097 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
1098 | filldir); | |
e5e5558e | 1099 | |
04730fef | 1100 | __free_page(page); |
b36c31ba | 1101 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 1102 | return err; |
e5e5558e MS |
1103 | } |
1104 | ||
1105 | static char *read_link(struct dentry *dentry) | |
1106 | { | |
1107 | struct inode *inode = dentry->d_inode; | |
1108 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 1109 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
1110 | char *link; |
1111 | ||
ce1d5a49 | 1112 | if (IS_ERR(req)) |
e231c2ee | 1113 | return ERR_CAST(req); |
e5e5558e MS |
1114 | |
1115 | link = (char *) __get_free_page(GFP_KERNEL); | |
1116 | if (!link) { | |
1117 | link = ERR_PTR(-ENOMEM); | |
1118 | goto out; | |
1119 | } | |
1120 | req->in.h.opcode = FUSE_READLINK; | |
1121 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1122 | req->out.argvar = 1; |
1123 | req->out.numargs = 1; | |
1124 | req->out.args[0].size = PAGE_SIZE - 1; | |
1125 | req->out.args[0].value = link; | |
b93f858a | 1126 | fuse_request_send(fc, req); |
e5e5558e MS |
1127 | if (req->out.h.error) { |
1128 | free_page((unsigned long) link); | |
1129 | link = ERR_PTR(req->out.h.error); | |
1130 | } else | |
1131 | link[req->out.args[0].size] = '\0'; | |
1132 | out: | |
1133 | fuse_put_request(fc, req); | |
b36c31ba | 1134 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
1135 | return link; |
1136 | } | |
1137 | ||
1138 | static void free_link(char *link) | |
1139 | { | |
1140 | if (!IS_ERR(link)) | |
1141 | free_page((unsigned long) link); | |
1142 | } | |
1143 | ||
1144 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1145 | { | |
1146 | nd_set_link(nd, read_link(dentry)); | |
1147 | return NULL; | |
1148 | } | |
1149 | ||
1150 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1151 | { | |
1152 | free_link(nd_get_link(nd)); | |
1153 | } | |
1154 | ||
1155 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1156 | { | |
91fe96b4 | 1157 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1158 | } |
1159 | ||
1160 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1161 | { | |
8b0797a4 MS |
1162 | fuse_release_common(file, FUSE_RELEASEDIR); |
1163 | ||
1164 | return 0; | |
e5e5558e MS |
1165 | } |
1166 | ||
7ea80859 | 1167 | static int fuse_dir_fsync(struct file *file, int datasync) |
82547981 | 1168 | { |
7ea80859 | 1169 | return fuse_fsync_common(file, datasync, 1); |
82547981 MS |
1170 | } |
1171 | ||
17637cba MS |
1172 | static bool update_mtime(unsigned ivalid) |
1173 | { | |
1174 | /* Always update if mtime is explicitly set */ | |
1175 | if (ivalid & ATTR_MTIME_SET) | |
1176 | return true; | |
1177 | ||
1178 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ | |
1179 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1180 | return false; | |
1181 | ||
1182 | /* In all other cases update */ | |
1183 | return true; | |
1184 | } | |
1185 | ||
befc649c | 1186 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
1187 | { |
1188 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1189 | |
1190 | if (ivalid & ATTR_MODE) | |
befc649c | 1191 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1192 | if (ivalid & ATTR_UID) |
befc649c | 1193 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 1194 | if (ivalid & ATTR_GID) |
befc649c | 1195 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 1196 | if (ivalid & ATTR_SIZE) |
befc649c | 1197 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1198 | if (ivalid & ATTR_ATIME) { |
1199 | arg->valid |= FATTR_ATIME; | |
befc649c | 1200 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1201 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1202 | if (!(ivalid & ATTR_ATIME_SET)) | |
1203 | arg->valid |= FATTR_ATIME_NOW; | |
1204 | } | |
1205 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) { | |
1206 | arg->valid |= FATTR_MTIME; | |
befc649c | 1207 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba MS |
1208 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
1209 | if (!(ivalid & ATTR_MTIME_SET)) | |
1210 | arg->valid |= FATTR_MTIME_NOW; | |
befc649c | 1211 | } |
9e6268db MS |
1212 | } |
1213 | ||
3be5a52b MS |
1214 | /* |
1215 | * Prevent concurrent writepages on inode | |
1216 | * | |
1217 | * This is done by adding a negative bias to the inode write counter | |
1218 | * and waiting for all pending writes to finish. | |
1219 | */ | |
1220 | void fuse_set_nowrite(struct inode *inode) | |
1221 | { | |
1222 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1223 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1224 | ||
1225 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1226 | ||
1227 | spin_lock(&fc->lock); | |
1228 | BUG_ON(fi->writectr < 0); | |
1229 | fi->writectr += FUSE_NOWRITE; | |
1230 | spin_unlock(&fc->lock); | |
1231 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * Allow writepages on inode | |
1236 | * | |
1237 | * Remove the bias from the writecounter and send any queued | |
1238 | * writepages. | |
1239 | */ | |
1240 | static void __fuse_release_nowrite(struct inode *inode) | |
1241 | { | |
1242 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1243 | ||
1244 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1245 | fi->writectr = 0; | |
1246 | fuse_flush_writepages(inode); | |
1247 | } | |
1248 | ||
1249 | void fuse_release_nowrite(struct inode *inode) | |
1250 | { | |
1251 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1252 | ||
1253 | spin_lock(&fc->lock); | |
1254 | __fuse_release_nowrite(inode); | |
1255 | spin_unlock(&fc->lock); | |
1256 | } | |
1257 | ||
6f9f1180 MS |
1258 | /* |
1259 | * Set attributes, and at the same time refresh them. | |
1260 | * | |
1261 | * Truncation is slightly complicated, because the 'truncate' request | |
1262 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1263 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1264 | * and the actual truncation by hand. | |
6f9f1180 | 1265 | */ |
49d4914f MS |
1266 | static int fuse_do_setattr(struct dentry *entry, struct iattr *attr, |
1267 | struct file *file) | |
9e6268db MS |
1268 | { |
1269 | struct inode *inode = entry->d_inode; | |
1270 | struct fuse_conn *fc = get_fuse_conn(inode); | |
9e6268db MS |
1271 | struct fuse_req *req; |
1272 | struct fuse_setattr_in inarg; | |
1273 | struct fuse_attr_out outarg; | |
3be5a52b MS |
1274 | bool is_truncate = false; |
1275 | loff_t oldsize; | |
9e6268db | 1276 | int err; |
9e6268db | 1277 | |
e57ac683 MS |
1278 | if (!fuse_allow_task(fc, current)) |
1279 | return -EACCES; | |
1280 | ||
db78b877 CH |
1281 | if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) |
1282 | attr->ia_valid |= ATTR_FORCE; | |
1283 | ||
1284 | err = inode_change_ok(inode, attr); | |
1285 | if (err) | |
1286 | return err; | |
1e9a4ed9 | 1287 | |
6ff958ed MS |
1288 | if ((attr->ia_valid & ATTR_OPEN) && fc->atomic_o_trunc) |
1289 | return 0; | |
1290 | ||
2c27c65e | 1291 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1292 | is_truncate = true; |
9e6268db | 1293 | |
ce1d5a49 MS |
1294 | req = fuse_get_req(fc); |
1295 | if (IS_ERR(req)) | |
1296 | return PTR_ERR(req); | |
9e6268db | 1297 | |
3be5a52b MS |
1298 | if (is_truncate) |
1299 | fuse_set_nowrite(inode); | |
1300 | ||
9e6268db | 1301 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1302 | memset(&outarg, 0, sizeof(outarg)); |
befc649c | 1303 | iattr_to_fattr(attr, &inarg); |
49d4914f MS |
1304 | if (file) { |
1305 | struct fuse_file *ff = file->private_data; | |
1306 | inarg.valid |= FATTR_FH; | |
1307 | inarg.fh = ff->fh; | |
1308 | } | |
f3332114 MS |
1309 | if (attr->ia_valid & ATTR_SIZE) { |
1310 | /* For mandatory locking in truncate */ | |
1311 | inarg.valid |= FATTR_LOCKOWNER; | |
1312 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1313 | } | |
9e6268db MS |
1314 | req->in.h.opcode = FUSE_SETATTR; |
1315 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1316 | req->in.numargs = 1; |
1317 | req->in.args[0].size = sizeof(inarg); | |
1318 | req->in.args[0].value = &inarg; | |
1319 | req->out.numargs = 1; | |
0e9663ee MS |
1320 | if (fc->minor < 9) |
1321 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1322 | else | |
1323 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 1324 | req->out.args[0].value = &outarg; |
b93f858a | 1325 | fuse_request_send(fc, req); |
9e6268db MS |
1326 | err = req->out.h.error; |
1327 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1328 | if (err) { |
1329 | if (err == -EINTR) | |
1330 | fuse_invalidate_attr(inode); | |
3be5a52b | 1331 | goto error; |
e00d2c2d | 1332 | } |
9e6268db | 1333 | |
e00d2c2d MS |
1334 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1335 | make_bad_inode(inode); | |
3be5a52b MS |
1336 | err = -EIO; |
1337 | goto error; | |
1338 | } | |
1339 | ||
1340 | spin_lock(&fc->lock); | |
1341 | fuse_change_attributes_common(inode, &outarg.attr, | |
1342 | attr_timeout(&outarg)); | |
1343 | oldsize = inode->i_size; | |
1344 | i_size_write(inode, outarg.attr.size); | |
1345 | ||
1346 | if (is_truncate) { | |
1347 | /* NOTE: this may release/reacquire fc->lock */ | |
1348 | __fuse_release_nowrite(inode); | |
1349 | } | |
1350 | spin_unlock(&fc->lock); | |
1351 | ||
1352 | /* | |
1353 | * Only call invalidate_inode_pages2() after removing | |
1354 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1355 | */ | |
1356 | if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
c08d3b0e | 1357 | truncate_pagecache(inode, oldsize, outarg.attr.size); |
3be5a52b | 1358 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1359 | } |
1360 | ||
e00d2c2d | 1361 | return 0; |
3be5a52b MS |
1362 | |
1363 | error: | |
1364 | if (is_truncate) | |
1365 | fuse_release_nowrite(inode); | |
1366 | ||
1367 | return err; | |
9e6268db MS |
1368 | } |
1369 | ||
49d4914f MS |
1370 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1371 | { | |
1372 | if (attr->ia_valid & ATTR_FILE) | |
1373 | return fuse_do_setattr(entry, attr, attr->ia_file); | |
1374 | else | |
1375 | return fuse_do_setattr(entry, attr, NULL); | |
1376 | } | |
1377 | ||
e5e5558e MS |
1378 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1379 | struct kstat *stat) | |
1380 | { | |
1381 | struct inode *inode = entry->d_inode; | |
244f6385 | 1382 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 MS |
1383 | |
1384 | if (!fuse_allow_task(fc, current)) | |
1385 | return -EACCES; | |
1386 | ||
bcb4be80 | 1387 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1388 | } |
1389 | ||
92a8780e MS |
1390 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1391 | const void *value, size_t size, int flags) | |
1392 | { | |
1393 | struct inode *inode = entry->d_inode; | |
1394 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1395 | struct fuse_req *req; | |
1396 | struct fuse_setxattr_in inarg; | |
1397 | int err; | |
1398 | ||
92a8780e MS |
1399 | if (fc->no_setxattr) |
1400 | return -EOPNOTSUPP; | |
1401 | ||
ce1d5a49 MS |
1402 | req = fuse_get_req(fc); |
1403 | if (IS_ERR(req)) | |
1404 | return PTR_ERR(req); | |
92a8780e MS |
1405 | |
1406 | memset(&inarg, 0, sizeof(inarg)); | |
1407 | inarg.size = size; | |
1408 | inarg.flags = flags; | |
1409 | req->in.h.opcode = FUSE_SETXATTR; | |
1410 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1411 | req->in.numargs = 3; |
1412 | req->in.args[0].size = sizeof(inarg); | |
1413 | req->in.args[0].value = &inarg; | |
1414 | req->in.args[1].size = strlen(name) + 1; | |
1415 | req->in.args[1].value = name; | |
1416 | req->in.args[2].size = size; | |
1417 | req->in.args[2].value = value; | |
b93f858a | 1418 | fuse_request_send(fc, req); |
92a8780e MS |
1419 | err = req->out.h.error; |
1420 | fuse_put_request(fc, req); | |
1421 | if (err == -ENOSYS) { | |
1422 | fc->no_setxattr = 1; | |
1423 | err = -EOPNOTSUPP; | |
1424 | } | |
1425 | return err; | |
1426 | } | |
1427 | ||
1428 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1429 | void *value, size_t size) | |
1430 | { | |
1431 | struct inode *inode = entry->d_inode; | |
1432 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1433 | struct fuse_req *req; | |
1434 | struct fuse_getxattr_in inarg; | |
1435 | struct fuse_getxattr_out outarg; | |
1436 | ssize_t ret; | |
1437 | ||
1438 | if (fc->no_getxattr) | |
1439 | return -EOPNOTSUPP; | |
1440 | ||
ce1d5a49 MS |
1441 | req = fuse_get_req(fc); |
1442 | if (IS_ERR(req)) | |
1443 | return PTR_ERR(req); | |
92a8780e MS |
1444 | |
1445 | memset(&inarg, 0, sizeof(inarg)); | |
1446 | inarg.size = size; | |
1447 | req->in.h.opcode = FUSE_GETXATTR; | |
1448 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1449 | req->in.numargs = 2; |
1450 | req->in.args[0].size = sizeof(inarg); | |
1451 | req->in.args[0].value = &inarg; | |
1452 | req->in.args[1].size = strlen(name) + 1; | |
1453 | req->in.args[1].value = name; | |
1454 | /* This is really two different operations rolled into one */ | |
1455 | req->out.numargs = 1; | |
1456 | if (size) { | |
1457 | req->out.argvar = 1; | |
1458 | req->out.args[0].size = size; | |
1459 | req->out.args[0].value = value; | |
1460 | } else { | |
1461 | req->out.args[0].size = sizeof(outarg); | |
1462 | req->out.args[0].value = &outarg; | |
1463 | } | |
b93f858a | 1464 | fuse_request_send(fc, req); |
92a8780e MS |
1465 | ret = req->out.h.error; |
1466 | if (!ret) | |
1467 | ret = size ? req->out.args[0].size : outarg.size; | |
1468 | else { | |
1469 | if (ret == -ENOSYS) { | |
1470 | fc->no_getxattr = 1; | |
1471 | ret = -EOPNOTSUPP; | |
1472 | } | |
1473 | } | |
1474 | fuse_put_request(fc, req); | |
1475 | return ret; | |
1476 | } | |
1477 | ||
1478 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1479 | { | |
1480 | struct inode *inode = entry->d_inode; | |
1481 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1482 | struct fuse_req *req; | |
1483 | struct fuse_getxattr_in inarg; | |
1484 | struct fuse_getxattr_out outarg; | |
1485 | ssize_t ret; | |
1486 | ||
e57ac683 MS |
1487 | if (!fuse_allow_task(fc, current)) |
1488 | return -EACCES; | |
1489 | ||
92a8780e MS |
1490 | if (fc->no_listxattr) |
1491 | return -EOPNOTSUPP; | |
1492 | ||
ce1d5a49 MS |
1493 | req = fuse_get_req(fc); |
1494 | if (IS_ERR(req)) | |
1495 | return PTR_ERR(req); | |
92a8780e MS |
1496 | |
1497 | memset(&inarg, 0, sizeof(inarg)); | |
1498 | inarg.size = size; | |
1499 | req->in.h.opcode = FUSE_LISTXATTR; | |
1500 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1501 | req->in.numargs = 1; |
1502 | req->in.args[0].size = sizeof(inarg); | |
1503 | req->in.args[0].value = &inarg; | |
1504 | /* This is really two different operations rolled into one */ | |
1505 | req->out.numargs = 1; | |
1506 | if (size) { | |
1507 | req->out.argvar = 1; | |
1508 | req->out.args[0].size = size; | |
1509 | req->out.args[0].value = list; | |
1510 | } else { | |
1511 | req->out.args[0].size = sizeof(outarg); | |
1512 | req->out.args[0].value = &outarg; | |
1513 | } | |
b93f858a | 1514 | fuse_request_send(fc, req); |
92a8780e MS |
1515 | ret = req->out.h.error; |
1516 | if (!ret) | |
1517 | ret = size ? req->out.args[0].size : outarg.size; | |
1518 | else { | |
1519 | if (ret == -ENOSYS) { | |
1520 | fc->no_listxattr = 1; | |
1521 | ret = -EOPNOTSUPP; | |
1522 | } | |
1523 | } | |
1524 | fuse_put_request(fc, req); | |
1525 | return ret; | |
1526 | } | |
1527 | ||
1528 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1529 | { | |
1530 | struct inode *inode = entry->d_inode; | |
1531 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1532 | struct fuse_req *req; | |
1533 | int err; | |
1534 | ||
1535 | if (fc->no_removexattr) | |
1536 | return -EOPNOTSUPP; | |
1537 | ||
ce1d5a49 MS |
1538 | req = fuse_get_req(fc); |
1539 | if (IS_ERR(req)) | |
1540 | return PTR_ERR(req); | |
92a8780e MS |
1541 | |
1542 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1543 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1544 | req->in.numargs = 1; |
1545 | req->in.args[0].size = strlen(name) + 1; | |
1546 | req->in.args[0].value = name; | |
b93f858a | 1547 | fuse_request_send(fc, req); |
92a8780e MS |
1548 | err = req->out.h.error; |
1549 | fuse_put_request(fc, req); | |
1550 | if (err == -ENOSYS) { | |
1551 | fc->no_removexattr = 1; | |
1552 | err = -EOPNOTSUPP; | |
1553 | } | |
1554 | return err; | |
1555 | } | |
1556 | ||
754661f1 | 1557 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1558 | .lookup = fuse_lookup, |
9e6268db MS |
1559 | .mkdir = fuse_mkdir, |
1560 | .symlink = fuse_symlink, | |
1561 | .unlink = fuse_unlink, | |
1562 | .rmdir = fuse_rmdir, | |
1563 | .rename = fuse_rename, | |
1564 | .link = fuse_link, | |
1565 | .setattr = fuse_setattr, | |
1566 | .create = fuse_create, | |
1567 | .mknod = fuse_mknod, | |
e5e5558e MS |
1568 | .permission = fuse_permission, |
1569 | .getattr = fuse_getattr, | |
92a8780e MS |
1570 | .setxattr = fuse_setxattr, |
1571 | .getxattr = fuse_getxattr, | |
1572 | .listxattr = fuse_listxattr, | |
1573 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1574 | }; |
1575 | ||
4b6f5d20 | 1576 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1577 | .llseek = generic_file_llseek, |
e5e5558e MS |
1578 | .read = generic_read_dir, |
1579 | .readdir = fuse_readdir, | |
1580 | .open = fuse_dir_open, | |
1581 | .release = fuse_dir_release, | |
82547981 | 1582 | .fsync = fuse_dir_fsync, |
e5e5558e MS |
1583 | }; |
1584 | ||
754661f1 | 1585 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1586 | .setattr = fuse_setattr, |
e5e5558e MS |
1587 | .permission = fuse_permission, |
1588 | .getattr = fuse_getattr, | |
92a8780e MS |
1589 | .setxattr = fuse_setxattr, |
1590 | .getxattr = fuse_getxattr, | |
1591 | .listxattr = fuse_listxattr, | |
1592 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1593 | }; |
1594 | ||
754661f1 | 1595 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1596 | .setattr = fuse_setattr, |
e5e5558e MS |
1597 | .follow_link = fuse_follow_link, |
1598 | .put_link = fuse_put_link, | |
1599 | .readlink = generic_readlink, | |
1600 | .getattr = fuse_getattr, | |
92a8780e MS |
1601 | .setxattr = fuse_setxattr, |
1602 | .getxattr = fuse_getxattr, | |
1603 | .listxattr = fuse_listxattr, | |
1604 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1605 | }; |
1606 | ||
1607 | void fuse_init_common(struct inode *inode) | |
1608 | { | |
1609 | inode->i_op = &fuse_common_inode_operations; | |
1610 | } | |
1611 | ||
1612 | void fuse_init_dir(struct inode *inode) | |
1613 | { | |
1614 | inode->i_op = &fuse_dir_inode_operations; | |
1615 | inode->i_fop = &fuse_dir_operations; | |
1616 | } | |
1617 | ||
1618 | void fuse_init_symlink(struct inode *inode) | |
1619 | { | |
1620 | inode->i_op = &fuse_symlink_inode_operations; | |
1621 | } |