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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; |
fd72faac MS |
378 | struct fuse_open_in inarg; |
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 | ||
402 | flags &= ~O_NOCTTY; | |
403 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 404 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
405 | inarg.flags = flags; |
406 | inarg.mode = mode; | |
407 | req->in.h.opcode = FUSE_CREATE; | |
408 | req->in.h.nodeid = get_node_id(dir); | |
fd72faac MS |
409 | req->in.numargs = 2; |
410 | req->in.args[0].size = sizeof(inarg); | |
411 | req->in.args[0].value = &inarg; | |
412 | req->in.args[1].size = entry->d_name.len + 1; | |
413 | req->in.args[1].value = entry->d_name.name; | |
414 | req->out.numargs = 2; | |
0e9663ee MS |
415 | if (fc->minor < 9) |
416 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
417 | else | |
418 | req->out.args[0].size = sizeof(outentry); | |
fd72faac MS |
419 | req->out.args[0].value = &outentry; |
420 | req->out.args[1].size = sizeof(outopen); | |
421 | req->out.args[1].value = &outopen; | |
b93f858a | 422 | fuse_request_send(fc, req); |
fd72faac MS |
423 | err = req->out.h.error; |
424 | if (err) { | |
425 | if (err == -ENOSYS) | |
426 | fc->no_create = 1; | |
427 | goto out_free_ff; | |
428 | } | |
429 | ||
430 | err = -EIO; | |
2827d0b2 | 431 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
432 | goto out_free_ff; |
433 | ||
51eb01e7 | 434 | fuse_put_request(fc, req); |
c7b7143c MS |
435 | ff->fh = outopen.fh; |
436 | ff->nodeid = outentry.nodeid; | |
437 | ff->open_flags = outopen.open_flags; | |
fd72faac | 438 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 439 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
440 | if (!inode) { |
441 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 442 | fuse_sync_release(ff, flags); |
51eb01e7 MS |
443 | fuse_send_forget(fc, forget_req, outentry.nodeid, 1); |
444 | return -ENOMEM; | |
fd72faac | 445 | } |
51eb01e7 | 446 | fuse_put_request(fc, forget_req); |
fd72faac | 447 | d_instantiate(entry, inode); |
1fb69e78 | 448 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 449 | fuse_invalidate_attr(dir); |
fd72faac MS |
450 | file = lookup_instantiate_filp(nd, entry, generic_file_open); |
451 | if (IS_ERR(file)) { | |
8b0797a4 | 452 | fuse_sync_release(ff, flags); |
fd72faac MS |
453 | return PTR_ERR(file); |
454 | } | |
c7b7143c MS |
455 | file->private_data = fuse_file_get(ff); |
456 | fuse_finish_open(inode, file); | |
fd72faac MS |
457 | return 0; |
458 | ||
459 | out_free_ff: | |
460 | fuse_file_free(ff); | |
461 | out_put_request: | |
462 | fuse_put_request(fc, req); | |
51eb01e7 MS |
463 | out_put_forget_req: |
464 | fuse_put_request(fc, forget_req); | |
fd72faac MS |
465 | return err; |
466 | } | |
467 | ||
6f9f1180 MS |
468 | /* |
469 | * Code shared between mknod, mkdir, symlink and link | |
470 | */ | |
9e6268db MS |
471 | static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req, |
472 | struct inode *dir, struct dentry *entry, | |
473 | int mode) | |
474 | { | |
475 | struct fuse_entry_out outarg; | |
476 | struct inode *inode; | |
9e6268db | 477 | int err; |
2d51013e MS |
478 | struct fuse_req *forget_req; |
479 | ||
480 | forget_req = fuse_get_req(fc); | |
481 | if (IS_ERR(forget_req)) { | |
482 | fuse_put_request(fc, req); | |
483 | return PTR_ERR(forget_req); | |
484 | } | |
9e6268db | 485 | |
0e9663ee | 486 | memset(&outarg, 0, sizeof(outarg)); |
9e6268db | 487 | req->in.h.nodeid = get_node_id(dir); |
9e6268db | 488 | req->out.numargs = 1; |
0e9663ee MS |
489 | if (fc->minor < 9) |
490 | req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE; | |
491 | else | |
492 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 493 | req->out.args[0].value = &outarg; |
b93f858a | 494 | fuse_request_send(fc, req); |
9e6268db | 495 | err = req->out.h.error; |
2d51013e MS |
496 | fuse_put_request(fc, req); |
497 | if (err) | |
498 | goto out_put_forget_req; | |
499 | ||
39ee059a MS |
500 | err = -EIO; |
501 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 502 | goto out_put_forget_req; |
39ee059a MS |
503 | |
504 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 505 | goto out_put_forget_req; |
39ee059a | 506 | |
9e6268db | 507 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 508 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 509 | if (!inode) { |
2d51013e | 510 | fuse_send_forget(fc, forget_req, outarg.nodeid, 1); |
9e6268db MS |
511 | return -ENOMEM; |
512 | } | |
2d51013e | 513 | fuse_put_request(fc, forget_req); |
9e6268db | 514 | |
d2a85164 MS |
515 | if (S_ISDIR(inode->i_mode)) { |
516 | struct dentry *alias; | |
517 | mutex_lock(&fc->inst_mutex); | |
518 | alias = d_find_alias(inode); | |
519 | if (alias) { | |
520 | /* New directory must have moved since mkdir */ | |
521 | mutex_unlock(&fc->inst_mutex); | |
522 | dput(alias); | |
523 | iput(inode); | |
524 | return -EBUSY; | |
525 | } | |
526 | d_instantiate(entry, inode); | |
527 | mutex_unlock(&fc->inst_mutex); | |
528 | } else | |
529 | d_instantiate(entry, inode); | |
9e6268db | 530 | |
1fb69e78 | 531 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
532 | fuse_invalidate_attr(dir); |
533 | return 0; | |
39ee059a | 534 | |
2d51013e MS |
535 | out_put_forget_req: |
536 | fuse_put_request(fc, forget_req); | |
39ee059a | 537 | return err; |
9e6268db MS |
538 | } |
539 | ||
540 | static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode, | |
541 | dev_t rdev) | |
542 | { | |
543 | struct fuse_mknod_in inarg; | |
544 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
545 | struct fuse_req *req = fuse_get_req(fc); |
546 | if (IS_ERR(req)) | |
547 | return PTR_ERR(req); | |
9e6268db MS |
548 | |
549 | memset(&inarg, 0, sizeof(inarg)); | |
550 | inarg.mode = mode; | |
551 | inarg.rdev = new_encode_dev(rdev); | |
552 | req->in.h.opcode = FUSE_MKNOD; | |
553 | req->in.numargs = 2; | |
554 | req->in.args[0].size = sizeof(inarg); | |
555 | req->in.args[0].value = &inarg; | |
556 | req->in.args[1].size = entry->d_name.len + 1; | |
557 | req->in.args[1].value = entry->d_name.name; | |
558 | return create_new_entry(fc, req, dir, entry, mode); | |
559 | } | |
560 | ||
561 | static int fuse_create(struct inode *dir, struct dentry *entry, int mode, | |
562 | struct nameidata *nd) | |
563 | { | |
b9ba347f | 564 | if (nd && (nd->flags & LOOKUP_OPEN)) { |
fd72faac MS |
565 | int err = fuse_create_open(dir, entry, mode, nd); |
566 | if (err != -ENOSYS) | |
567 | return err; | |
568 | /* Fall back on mknod */ | |
569 | } | |
9e6268db MS |
570 | return fuse_mknod(dir, entry, mode, 0); |
571 | } | |
572 | ||
573 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode) | |
574 | { | |
575 | struct fuse_mkdir_in inarg; | |
576 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
577 | struct fuse_req *req = fuse_get_req(fc); |
578 | if (IS_ERR(req)) | |
579 | return PTR_ERR(req); | |
9e6268db MS |
580 | |
581 | memset(&inarg, 0, sizeof(inarg)); | |
582 | inarg.mode = mode; | |
583 | req->in.h.opcode = FUSE_MKDIR; | |
584 | req->in.numargs = 2; | |
585 | req->in.args[0].size = sizeof(inarg); | |
586 | req->in.args[0].value = &inarg; | |
587 | req->in.args[1].size = entry->d_name.len + 1; | |
588 | req->in.args[1].value = entry->d_name.name; | |
589 | return create_new_entry(fc, req, dir, entry, S_IFDIR); | |
590 | } | |
591 | ||
592 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
593 | const char *link) | |
594 | { | |
595 | struct fuse_conn *fc = get_fuse_conn(dir); | |
596 | unsigned len = strlen(link) + 1; | |
ce1d5a49 MS |
597 | struct fuse_req *req = fuse_get_req(fc); |
598 | if (IS_ERR(req)) | |
599 | return PTR_ERR(req); | |
9e6268db MS |
600 | |
601 | req->in.h.opcode = FUSE_SYMLINK; | |
602 | req->in.numargs = 2; | |
603 | req->in.args[0].size = entry->d_name.len + 1; | |
604 | req->in.args[0].value = entry->d_name.name; | |
605 | req->in.args[1].size = len; | |
606 | req->in.args[1].value = link; | |
607 | return create_new_entry(fc, req, dir, entry, S_IFLNK); | |
608 | } | |
609 | ||
610 | static int fuse_unlink(struct inode *dir, struct dentry *entry) | |
611 | { | |
612 | int err; | |
613 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
614 | struct fuse_req *req = fuse_get_req(fc); |
615 | if (IS_ERR(req)) | |
616 | return PTR_ERR(req); | |
9e6268db MS |
617 | |
618 | req->in.h.opcode = FUSE_UNLINK; | |
619 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
620 | req->in.numargs = 1; |
621 | req->in.args[0].size = entry->d_name.len + 1; | |
622 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 623 | fuse_request_send(fc, req); |
9e6268db MS |
624 | err = req->out.h.error; |
625 | fuse_put_request(fc, req); | |
626 | if (!err) { | |
627 | struct inode *inode = entry->d_inode; | |
628 | ||
1729a16c MS |
629 | /* |
630 | * Set nlink to zero so the inode can be cleared, if the inode | |
631 | * does have more links this will be discovered at the next | |
632 | * lookup/getattr. | |
633 | */ | |
ce71ec36 | 634 | clear_nlink(inode); |
9e6268db MS |
635 | fuse_invalidate_attr(inode); |
636 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 637 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
638 | } else if (err == -EINTR) |
639 | fuse_invalidate_entry(entry); | |
640 | return err; | |
641 | } | |
642 | ||
643 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
644 | { | |
645 | int err; | |
646 | struct fuse_conn *fc = get_fuse_conn(dir); | |
ce1d5a49 MS |
647 | struct fuse_req *req = fuse_get_req(fc); |
648 | if (IS_ERR(req)) | |
649 | return PTR_ERR(req); | |
9e6268db MS |
650 | |
651 | req->in.h.opcode = FUSE_RMDIR; | |
652 | req->in.h.nodeid = get_node_id(dir); | |
9e6268db MS |
653 | req->in.numargs = 1; |
654 | req->in.args[0].size = entry->d_name.len + 1; | |
655 | req->in.args[0].value = entry->d_name.name; | |
b93f858a | 656 | fuse_request_send(fc, req); |
9e6268db MS |
657 | err = req->out.h.error; |
658 | fuse_put_request(fc, req); | |
659 | if (!err) { | |
ce71ec36 | 660 | clear_nlink(entry->d_inode); |
9e6268db | 661 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 662 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
663 | } else if (err == -EINTR) |
664 | fuse_invalidate_entry(entry); | |
665 | return err; | |
666 | } | |
667 | ||
668 | static int fuse_rename(struct inode *olddir, struct dentry *oldent, | |
669 | struct inode *newdir, struct dentry *newent) | |
670 | { | |
671 | int err; | |
672 | struct fuse_rename_in inarg; | |
673 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
ce1d5a49 MS |
674 | struct fuse_req *req = fuse_get_req(fc); |
675 | if (IS_ERR(req)) | |
676 | return PTR_ERR(req); | |
9e6268db MS |
677 | |
678 | memset(&inarg, 0, sizeof(inarg)); | |
679 | inarg.newdir = get_node_id(newdir); | |
680 | req->in.h.opcode = FUSE_RENAME; | |
681 | req->in.h.nodeid = get_node_id(olddir); | |
9e6268db MS |
682 | req->in.numargs = 3; |
683 | req->in.args[0].size = sizeof(inarg); | |
684 | req->in.args[0].value = &inarg; | |
685 | req->in.args[1].size = oldent->d_name.len + 1; | |
686 | req->in.args[1].value = oldent->d_name.name; | |
687 | req->in.args[2].size = newent->d_name.len + 1; | |
688 | req->in.args[2].value = newent->d_name.name; | |
b93f858a | 689 | fuse_request_send(fc, req); |
9e6268db MS |
690 | err = req->out.h.error; |
691 | fuse_put_request(fc, req); | |
692 | if (!err) { | |
08b63307 MS |
693 | /* ctime changes */ |
694 | fuse_invalidate_attr(oldent->d_inode); | |
695 | ||
9e6268db MS |
696 | fuse_invalidate_attr(olddir); |
697 | if (olddir != newdir) | |
698 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
699 | |
700 | /* newent will end up negative */ | |
701 | if (newent->d_inode) | |
702 | fuse_invalidate_entry_cache(newent); | |
9e6268db MS |
703 | } else if (err == -EINTR) { |
704 | /* If request was interrupted, DEITY only knows if the | |
705 | rename actually took place. If the invalidation | |
706 | fails (e.g. some process has CWD under the renamed | |
707 | directory), then there can be inconsistency between | |
708 | the dcache and the real filesystem. Tough luck. */ | |
709 | fuse_invalidate_entry(oldent); | |
710 | if (newent->d_inode) | |
711 | fuse_invalidate_entry(newent); | |
712 | } | |
713 | ||
714 | return err; | |
715 | } | |
716 | ||
717 | static int fuse_link(struct dentry *entry, struct inode *newdir, | |
718 | struct dentry *newent) | |
719 | { | |
720 | int err; | |
721 | struct fuse_link_in inarg; | |
722 | struct inode *inode = entry->d_inode; | |
723 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 MS |
724 | struct fuse_req *req = fuse_get_req(fc); |
725 | if (IS_ERR(req)) | |
726 | return PTR_ERR(req); | |
9e6268db MS |
727 | |
728 | memset(&inarg, 0, sizeof(inarg)); | |
729 | inarg.oldnodeid = get_node_id(inode); | |
730 | req->in.h.opcode = FUSE_LINK; | |
9e6268db MS |
731 | req->in.numargs = 2; |
732 | req->in.args[0].size = sizeof(inarg); | |
733 | req->in.args[0].value = &inarg; | |
734 | req->in.args[1].size = newent->d_name.len + 1; | |
735 | req->in.args[1].value = newent->d_name.name; | |
736 | err = create_new_entry(fc, req, newdir, newent, inode->i_mode); | |
737 | /* Contrary to "normal" filesystems it can happen that link | |
738 | makes two "logical" inodes point to the same "physical" | |
739 | inode. We invalidate the attributes of the old one, so it | |
740 | will reflect changes in the backing inode (link count, | |
741 | etc.) | |
742 | */ | |
743 | if (!err || err == -EINTR) | |
744 | fuse_invalidate_attr(inode); | |
745 | return err; | |
746 | } | |
747 | ||
1fb69e78 MS |
748 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
749 | struct kstat *stat) | |
750 | { | |
751 | stat->dev = inode->i_sb->s_dev; | |
752 | stat->ino = attr->ino; | |
753 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
754 | stat->nlink = attr->nlink; | |
755 | stat->uid = attr->uid; | |
756 | stat->gid = attr->gid; | |
757 | stat->rdev = inode->i_rdev; | |
758 | stat->atime.tv_sec = attr->atime; | |
759 | stat->atime.tv_nsec = attr->atimensec; | |
760 | stat->mtime.tv_sec = attr->mtime; | |
761 | stat->mtime.tv_nsec = attr->mtimensec; | |
762 | stat->ctime.tv_sec = attr->ctime; | |
763 | stat->ctime.tv_nsec = attr->ctimensec; | |
764 | stat->size = attr->size; | |
765 | stat->blocks = attr->blocks; | |
766 | stat->blksize = (1 << inode->i_blkbits); | |
767 | } | |
768 | ||
c79e322f MS |
769 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
770 | struct file *file) | |
e5e5558e MS |
771 | { |
772 | int err; | |
c79e322f MS |
773 | struct fuse_getattr_in inarg; |
774 | struct fuse_attr_out outarg; | |
e5e5558e | 775 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 MS |
776 | struct fuse_req *req; |
777 | u64 attr_version; | |
778 | ||
779 | req = fuse_get_req(fc); | |
ce1d5a49 MS |
780 | if (IS_ERR(req)) |
781 | return PTR_ERR(req); | |
e5e5558e | 782 | |
7dca9fd3 | 783 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 784 | |
c79e322f | 785 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 786 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
787 | /* Directories have separate file-handle space */ |
788 | if (file && S_ISREG(inode->i_mode)) { | |
789 | struct fuse_file *ff = file->private_data; | |
790 | ||
791 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
792 | inarg.fh = ff->fh; | |
793 | } | |
e5e5558e MS |
794 | req->in.h.opcode = FUSE_GETATTR; |
795 | req->in.h.nodeid = get_node_id(inode); | |
c79e322f MS |
796 | req->in.numargs = 1; |
797 | req->in.args[0].size = sizeof(inarg); | |
798 | req->in.args[0].value = &inarg; | |
e5e5558e | 799 | req->out.numargs = 1; |
0e9663ee MS |
800 | if (fc->minor < 9) |
801 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
802 | else | |
803 | req->out.args[0].size = sizeof(outarg); | |
c79e322f | 804 | req->out.args[0].value = &outarg; |
b93f858a | 805 | fuse_request_send(fc, req); |
e5e5558e MS |
806 | err = req->out.h.error; |
807 | fuse_put_request(fc, req); | |
808 | if (!err) { | |
c79e322f | 809 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
810 | make_bad_inode(inode); |
811 | err = -EIO; | |
812 | } else { | |
c79e322f MS |
813 | fuse_change_attributes(inode, &outarg.attr, |
814 | attr_timeout(&outarg), | |
1fb69e78 MS |
815 | attr_version); |
816 | if (stat) | |
c79e322f | 817 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
818 | } |
819 | } | |
820 | return err; | |
821 | } | |
822 | ||
bcb4be80 MS |
823 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
824 | struct file *file, bool *refreshed) | |
825 | { | |
826 | struct fuse_inode *fi = get_fuse_inode(inode); | |
827 | int err; | |
828 | bool r; | |
829 | ||
830 | if (fi->i_time < get_jiffies_64()) { | |
831 | r = true; | |
832 | err = fuse_do_getattr(inode, stat, file); | |
833 | } else { | |
834 | r = false; | |
835 | err = 0; | |
836 | if (stat) { | |
837 | generic_fillattr(inode, stat); | |
838 | stat->mode = fi->orig_i_mode; | |
839 | } | |
840 | } | |
841 | ||
842 | if (refreshed != NULL) | |
843 | *refreshed = r; | |
844 | ||
845 | return err; | |
846 | } | |
847 | ||
87729a55 MS |
848 | /* |
849 | * Calling into a user-controlled filesystem gives the filesystem | |
850 | * daemon ptrace-like capabilities over the requester process. This | |
851 | * means, that the filesystem daemon is able to record the exact | |
852 | * filesystem operations performed, and can also control the behavior | |
853 | * of the requester process in otherwise impossible ways. For example | |
854 | * it can delay the operation for arbitrary length of time allowing | |
855 | * DoS against the requester. | |
856 | * | |
857 | * For this reason only those processes can call into the filesystem, | |
858 | * for which the owner of the mount has ptrace privilege. This | |
859 | * excludes processes started by other users, suid or sgid processes. | |
860 | */ | |
e57ac683 | 861 | int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task) |
87729a55 | 862 | { |
c69e8d9c DH |
863 | const struct cred *cred; |
864 | int ret; | |
87729a55 | 865 | |
c69e8d9c | 866 | if (fc->flags & FUSE_ALLOW_OTHER) |
87729a55 MS |
867 | return 1; |
868 | ||
c69e8d9c DH |
869 | rcu_read_lock(); |
870 | ret = 0; | |
871 | cred = __task_cred(task); | |
872 | if (cred->euid == fc->user_id && | |
873 | cred->suid == fc->user_id && | |
874 | cred->uid == fc->user_id && | |
875 | cred->egid == fc->group_id && | |
876 | cred->sgid == fc->group_id && | |
877 | cred->gid == fc->group_id) | |
878 | ret = 1; | |
879 | rcu_read_unlock(); | |
880 | ||
881 | return ret; | |
87729a55 MS |
882 | } |
883 | ||
31d40d74 MS |
884 | static int fuse_access(struct inode *inode, int mask) |
885 | { | |
886 | struct fuse_conn *fc = get_fuse_conn(inode); | |
887 | struct fuse_req *req; | |
888 | struct fuse_access_in inarg; | |
889 | int err; | |
890 | ||
891 | if (fc->no_access) | |
892 | return 0; | |
893 | ||
ce1d5a49 MS |
894 | req = fuse_get_req(fc); |
895 | if (IS_ERR(req)) | |
896 | return PTR_ERR(req); | |
31d40d74 MS |
897 | |
898 | memset(&inarg, 0, sizeof(inarg)); | |
e6305c43 | 899 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
31d40d74 MS |
900 | req->in.h.opcode = FUSE_ACCESS; |
901 | req->in.h.nodeid = get_node_id(inode); | |
31d40d74 MS |
902 | req->in.numargs = 1; |
903 | req->in.args[0].size = sizeof(inarg); | |
904 | req->in.args[0].value = &inarg; | |
b93f858a | 905 | fuse_request_send(fc, req); |
31d40d74 MS |
906 | err = req->out.h.error; |
907 | fuse_put_request(fc, req); | |
908 | if (err == -ENOSYS) { | |
909 | fc->no_access = 1; | |
910 | err = 0; | |
911 | } | |
912 | return err; | |
913 | } | |
914 | ||
6f9f1180 MS |
915 | /* |
916 | * Check permission. The two basic access models of FUSE are: | |
917 | * | |
918 | * 1) Local access checking ('default_permissions' mount option) based | |
919 | * on file mode. This is the plain old disk filesystem permission | |
920 | * modell. | |
921 | * | |
922 | * 2) "Remote" access checking, where server is responsible for | |
923 | * checking permission in each inode operation. An exception to this | |
924 | * is if ->permission() was invoked from sys_access() in which case an | |
925 | * access request is sent. Execute permission is still checked | |
926 | * locally based on file mode. | |
927 | */ | |
e6305c43 | 928 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
929 | { |
930 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
931 | bool refreshed = false; |
932 | int err = 0; | |
e5e5558e | 933 | |
87729a55 | 934 | if (!fuse_allow_task(fc, current)) |
e5e5558e | 935 | return -EACCES; |
244f6385 MS |
936 | |
937 | /* | |
e8e96157 | 938 | * If attributes are needed, refresh them before proceeding |
244f6385 | 939 | */ |
e8e96157 MS |
940 | if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) || |
941 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { | |
bcb4be80 MS |
942 | err = fuse_update_attributes(inode, NULL, NULL, &refreshed); |
943 | if (err) | |
944 | return err; | |
244f6385 MS |
945 | } |
946 | ||
947 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { | |
1a823ac9 | 948 | err = generic_permission(inode, mask, NULL); |
1e9a4ed9 MS |
949 | |
950 | /* If permission is denied, try to refresh file | |
951 | attributes. This is also needed, because the root | |
952 | node will at first have no permissions */ | |
244f6385 | 953 | if (err == -EACCES && !refreshed) { |
c79e322f | 954 | err = fuse_do_getattr(inode, NULL, NULL); |
1e9a4ed9 MS |
955 | if (!err) |
956 | err = generic_permission(inode, mask, NULL); | |
957 | } | |
958 | ||
6f9f1180 MS |
959 | /* Note: the opposite of the above test does not |
960 | exist. So if permissions are revoked this won't be | |
961 | noticed immediately, only after the attribute | |
962 | timeout has expired */ | |
a110343f | 963 | } else if (mask & MAY_ACCESS) { |
e8e96157 MS |
964 | err = fuse_access(inode, mask); |
965 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
966 | if (!(inode->i_mode & S_IXUGO)) { | |
967 | if (refreshed) | |
968 | return -EACCES; | |
969 | ||
c79e322f | 970 | err = fuse_do_getattr(inode, NULL, NULL); |
e8e96157 MS |
971 | if (!err && !(inode->i_mode & S_IXUGO)) |
972 | return -EACCES; | |
973 | } | |
e5e5558e | 974 | } |
244f6385 | 975 | return err; |
e5e5558e MS |
976 | } |
977 | ||
978 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
979 | void *dstbuf, filldir_t filldir) | |
980 | { | |
981 | while (nbytes >= FUSE_NAME_OFFSET) { | |
982 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
983 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
984 | int over; | |
985 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
986 | return -EIO; | |
987 | if (reclen > nbytes) | |
988 | break; | |
989 | ||
990 | over = filldir(dstbuf, dirent->name, dirent->namelen, | |
991 | file->f_pos, dirent->ino, dirent->type); | |
992 | if (over) | |
993 | break; | |
994 | ||
995 | buf += reclen; | |
996 | nbytes -= reclen; | |
997 | file->f_pos = dirent->off; | |
998 | } | |
999 | ||
1000 | return 0; | |
1001 | } | |
1002 | ||
04730fef | 1003 | static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) |
e5e5558e | 1004 | { |
04730fef MS |
1005 | int err; |
1006 | size_t nbytes; | |
1007 | struct page *page; | |
7706a9d6 | 1008 | struct inode *inode = file->f_path.dentry->d_inode; |
e5e5558e | 1009 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 MS |
1010 | struct fuse_req *req; |
1011 | ||
1012 | if (is_bad_inode(inode)) | |
1013 | return -EIO; | |
1014 | ||
ce1d5a49 MS |
1015 | req = fuse_get_req(fc); |
1016 | if (IS_ERR(req)) | |
1017 | return PTR_ERR(req); | |
e5e5558e | 1018 | |
04730fef MS |
1019 | page = alloc_page(GFP_KERNEL); |
1020 | if (!page) { | |
1021 | fuse_put_request(fc, req); | |
1022 | return -ENOMEM; | |
1023 | } | |
f4975c67 | 1024 | req->out.argpages = 1; |
04730fef MS |
1025 | req->num_pages = 1; |
1026 | req->pages[0] = page; | |
2106cb18 | 1027 | fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR); |
b93f858a | 1028 | fuse_request_send(fc, req); |
361b1eb5 | 1029 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1030 | err = req->out.h.error; |
1031 | fuse_put_request(fc, req); | |
1032 | if (!err) | |
04730fef MS |
1033 | err = parse_dirfile(page_address(page), nbytes, file, dstbuf, |
1034 | filldir); | |
e5e5558e | 1035 | |
04730fef | 1036 | __free_page(page); |
b36c31ba | 1037 | fuse_invalidate_attr(inode); /* atime changed */ |
04730fef | 1038 | return err; |
e5e5558e MS |
1039 | } |
1040 | ||
1041 | static char *read_link(struct dentry *dentry) | |
1042 | { | |
1043 | struct inode *inode = dentry->d_inode; | |
1044 | struct fuse_conn *fc = get_fuse_conn(inode); | |
ce1d5a49 | 1045 | struct fuse_req *req = fuse_get_req(fc); |
e5e5558e MS |
1046 | char *link; |
1047 | ||
ce1d5a49 | 1048 | if (IS_ERR(req)) |
e231c2ee | 1049 | return ERR_CAST(req); |
e5e5558e MS |
1050 | |
1051 | link = (char *) __get_free_page(GFP_KERNEL); | |
1052 | if (!link) { | |
1053 | link = ERR_PTR(-ENOMEM); | |
1054 | goto out; | |
1055 | } | |
1056 | req->in.h.opcode = FUSE_READLINK; | |
1057 | req->in.h.nodeid = get_node_id(inode); | |
e5e5558e MS |
1058 | req->out.argvar = 1; |
1059 | req->out.numargs = 1; | |
1060 | req->out.args[0].size = PAGE_SIZE - 1; | |
1061 | req->out.args[0].value = link; | |
b93f858a | 1062 | fuse_request_send(fc, req); |
e5e5558e MS |
1063 | if (req->out.h.error) { |
1064 | free_page((unsigned long) link); | |
1065 | link = ERR_PTR(req->out.h.error); | |
1066 | } else | |
1067 | link[req->out.args[0].size] = '\0'; | |
1068 | out: | |
1069 | fuse_put_request(fc, req); | |
b36c31ba | 1070 | fuse_invalidate_attr(inode); /* atime changed */ |
e5e5558e MS |
1071 | return link; |
1072 | } | |
1073 | ||
1074 | static void free_link(char *link) | |
1075 | { | |
1076 | if (!IS_ERR(link)) | |
1077 | free_page((unsigned long) link); | |
1078 | } | |
1079 | ||
1080 | static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1081 | { | |
1082 | nd_set_link(nd, read_link(dentry)); | |
1083 | return NULL; | |
1084 | } | |
1085 | ||
1086 | static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) | |
1087 | { | |
1088 | free_link(nd_get_link(nd)); | |
1089 | } | |
1090 | ||
1091 | static int fuse_dir_open(struct inode *inode, struct file *file) | |
1092 | { | |
91fe96b4 | 1093 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1094 | } |
1095 | ||
1096 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1097 | { | |
8b0797a4 MS |
1098 | fuse_release_common(file, FUSE_RELEASEDIR); |
1099 | ||
1100 | return 0; | |
e5e5558e MS |
1101 | } |
1102 | ||
82547981 MS |
1103 | static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) |
1104 | { | |
1105 | /* nfsd can call this with no file */ | |
1106 | return file ? fuse_fsync_common(file, de, datasync, 1) : 0; | |
1107 | } | |
1108 | ||
17637cba MS |
1109 | static bool update_mtime(unsigned ivalid) |
1110 | { | |
1111 | /* Always update if mtime is explicitly set */ | |
1112 | if (ivalid & ATTR_MTIME_SET) | |
1113 | return true; | |
1114 | ||
1115 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ | |
1116 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1117 | return false; | |
1118 | ||
1119 | /* In all other cases update */ | |
1120 | return true; | |
1121 | } | |
1122 | ||
befc649c | 1123 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg) |
9e6268db MS |
1124 | { |
1125 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1126 | |
1127 | if (ivalid & ATTR_MODE) | |
befc649c | 1128 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1129 | if (ivalid & ATTR_UID) |
befc649c | 1130 | arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid; |
9e6268db | 1131 | if (ivalid & ATTR_GID) |
befc649c | 1132 | arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid; |
9e6268db | 1133 | if (ivalid & ATTR_SIZE) |
befc649c | 1134 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1135 | if (ivalid & ATTR_ATIME) { |
1136 | arg->valid |= FATTR_ATIME; | |
befc649c | 1137 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1138 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1139 | if (!(ivalid & ATTR_ATIME_SET)) | |
1140 | arg->valid |= FATTR_ATIME_NOW; | |
1141 | } | |
1142 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) { | |
1143 | arg->valid |= FATTR_MTIME; | |
befc649c | 1144 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba MS |
1145 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
1146 | if (!(ivalid & ATTR_MTIME_SET)) | |
1147 | arg->valid |= FATTR_MTIME_NOW; | |
befc649c | 1148 | } |
9e6268db MS |
1149 | } |
1150 | ||
3be5a52b MS |
1151 | /* |
1152 | * Prevent concurrent writepages on inode | |
1153 | * | |
1154 | * This is done by adding a negative bias to the inode write counter | |
1155 | * and waiting for all pending writes to finish. | |
1156 | */ | |
1157 | void fuse_set_nowrite(struct inode *inode) | |
1158 | { | |
1159 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1160 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1161 | ||
1162 | BUG_ON(!mutex_is_locked(&inode->i_mutex)); | |
1163 | ||
1164 | spin_lock(&fc->lock); | |
1165 | BUG_ON(fi->writectr < 0); | |
1166 | fi->writectr += FUSE_NOWRITE; | |
1167 | spin_unlock(&fc->lock); | |
1168 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | * Allow writepages on inode | |
1173 | * | |
1174 | * Remove the bias from the writecounter and send any queued | |
1175 | * writepages. | |
1176 | */ | |
1177 | static void __fuse_release_nowrite(struct inode *inode) | |
1178 | { | |
1179 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1180 | ||
1181 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1182 | fi->writectr = 0; | |
1183 | fuse_flush_writepages(inode); | |
1184 | } | |
1185 | ||
1186 | void fuse_release_nowrite(struct inode *inode) | |
1187 | { | |
1188 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1189 | ||
1190 | spin_lock(&fc->lock); | |
1191 | __fuse_release_nowrite(inode); | |
1192 | spin_unlock(&fc->lock); | |
1193 | } | |
1194 | ||
6f9f1180 MS |
1195 | /* |
1196 | * Set attributes, and at the same time refresh them. | |
1197 | * | |
1198 | * Truncation is slightly complicated, because the 'truncate' request | |
1199 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1200 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1201 | * and the actual truncation by hand. | |
6f9f1180 | 1202 | */ |
49d4914f MS |
1203 | static int fuse_do_setattr(struct dentry *entry, struct iattr *attr, |
1204 | struct file *file) | |
9e6268db MS |
1205 | { |
1206 | struct inode *inode = entry->d_inode; | |
1207 | struct fuse_conn *fc = get_fuse_conn(inode); | |
9e6268db MS |
1208 | struct fuse_req *req; |
1209 | struct fuse_setattr_in inarg; | |
1210 | struct fuse_attr_out outarg; | |
3be5a52b MS |
1211 | bool is_truncate = false; |
1212 | loff_t oldsize; | |
9e6268db | 1213 | int err; |
9e6268db | 1214 | |
e57ac683 MS |
1215 | if (!fuse_allow_task(fc, current)) |
1216 | return -EACCES; | |
1217 | ||
1e9a4ed9 MS |
1218 | if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { |
1219 | err = inode_change_ok(inode, attr); | |
1220 | if (err) | |
1221 | return err; | |
1222 | } | |
1223 | ||
6ff958ed MS |
1224 | if ((attr->ia_valid & ATTR_OPEN) && fc->atomic_o_trunc) |
1225 | return 0; | |
1226 | ||
9e6268db MS |
1227 | if (attr->ia_valid & ATTR_SIZE) { |
1228 | unsigned long limit; | |
b2d2272f MS |
1229 | if (IS_SWAPFILE(inode)) |
1230 | return -ETXTBSY; | |
9e6268db MS |
1231 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
1232 | if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) { | |
1233 | send_sig(SIGXFSZ, current, 0); | |
1234 | return -EFBIG; | |
1235 | } | |
3be5a52b | 1236 | is_truncate = true; |
9e6268db MS |
1237 | } |
1238 | ||
ce1d5a49 MS |
1239 | req = fuse_get_req(fc); |
1240 | if (IS_ERR(req)) | |
1241 | return PTR_ERR(req); | |
9e6268db | 1242 | |
3be5a52b MS |
1243 | if (is_truncate) |
1244 | fuse_set_nowrite(inode); | |
1245 | ||
9e6268db | 1246 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1247 | memset(&outarg, 0, sizeof(outarg)); |
befc649c | 1248 | iattr_to_fattr(attr, &inarg); |
49d4914f MS |
1249 | if (file) { |
1250 | struct fuse_file *ff = file->private_data; | |
1251 | inarg.valid |= FATTR_FH; | |
1252 | inarg.fh = ff->fh; | |
1253 | } | |
f3332114 MS |
1254 | if (attr->ia_valid & ATTR_SIZE) { |
1255 | /* For mandatory locking in truncate */ | |
1256 | inarg.valid |= FATTR_LOCKOWNER; | |
1257 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1258 | } | |
9e6268db MS |
1259 | req->in.h.opcode = FUSE_SETATTR; |
1260 | req->in.h.nodeid = get_node_id(inode); | |
9e6268db MS |
1261 | req->in.numargs = 1; |
1262 | req->in.args[0].size = sizeof(inarg); | |
1263 | req->in.args[0].value = &inarg; | |
1264 | req->out.numargs = 1; | |
0e9663ee MS |
1265 | if (fc->minor < 9) |
1266 | req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE; | |
1267 | else | |
1268 | req->out.args[0].size = sizeof(outarg); | |
9e6268db | 1269 | req->out.args[0].value = &outarg; |
b93f858a | 1270 | fuse_request_send(fc, req); |
9e6268db MS |
1271 | err = req->out.h.error; |
1272 | fuse_put_request(fc, req); | |
e00d2c2d MS |
1273 | if (err) { |
1274 | if (err == -EINTR) | |
1275 | fuse_invalidate_attr(inode); | |
3be5a52b | 1276 | goto error; |
e00d2c2d | 1277 | } |
9e6268db | 1278 | |
e00d2c2d MS |
1279 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1280 | make_bad_inode(inode); | |
3be5a52b MS |
1281 | err = -EIO; |
1282 | goto error; | |
1283 | } | |
1284 | ||
1285 | spin_lock(&fc->lock); | |
1286 | fuse_change_attributes_common(inode, &outarg.attr, | |
1287 | attr_timeout(&outarg)); | |
1288 | oldsize = inode->i_size; | |
1289 | i_size_write(inode, outarg.attr.size); | |
1290 | ||
1291 | if (is_truncate) { | |
1292 | /* NOTE: this may release/reacquire fc->lock */ | |
1293 | __fuse_release_nowrite(inode); | |
1294 | } | |
1295 | spin_unlock(&fc->lock); | |
1296 | ||
1297 | /* | |
1298 | * Only call invalidate_inode_pages2() after removing | |
1299 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1300 | */ | |
1301 | if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
1302 | if (outarg.attr.size < oldsize) | |
1303 | fuse_truncate(inode->i_mapping, outarg.attr.size); | |
1304 | invalidate_inode_pages2(inode->i_mapping); | |
e00d2c2d MS |
1305 | } |
1306 | ||
e00d2c2d | 1307 | return 0; |
3be5a52b MS |
1308 | |
1309 | error: | |
1310 | if (is_truncate) | |
1311 | fuse_release_nowrite(inode); | |
1312 | ||
1313 | return err; | |
9e6268db MS |
1314 | } |
1315 | ||
49d4914f MS |
1316 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1317 | { | |
1318 | if (attr->ia_valid & ATTR_FILE) | |
1319 | return fuse_do_setattr(entry, attr, attr->ia_file); | |
1320 | else | |
1321 | return fuse_do_setattr(entry, attr, NULL); | |
1322 | } | |
1323 | ||
e5e5558e MS |
1324 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1325 | struct kstat *stat) | |
1326 | { | |
1327 | struct inode *inode = entry->d_inode; | |
244f6385 | 1328 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 MS |
1329 | |
1330 | if (!fuse_allow_task(fc, current)) | |
1331 | return -EACCES; | |
1332 | ||
bcb4be80 | 1333 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1334 | } |
1335 | ||
92a8780e MS |
1336 | static int fuse_setxattr(struct dentry *entry, const char *name, |
1337 | const void *value, size_t size, int flags) | |
1338 | { | |
1339 | struct inode *inode = entry->d_inode; | |
1340 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1341 | struct fuse_req *req; | |
1342 | struct fuse_setxattr_in inarg; | |
1343 | int err; | |
1344 | ||
92a8780e MS |
1345 | if (fc->no_setxattr) |
1346 | return -EOPNOTSUPP; | |
1347 | ||
ce1d5a49 MS |
1348 | req = fuse_get_req(fc); |
1349 | if (IS_ERR(req)) | |
1350 | return PTR_ERR(req); | |
92a8780e MS |
1351 | |
1352 | memset(&inarg, 0, sizeof(inarg)); | |
1353 | inarg.size = size; | |
1354 | inarg.flags = flags; | |
1355 | req->in.h.opcode = FUSE_SETXATTR; | |
1356 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1357 | req->in.numargs = 3; |
1358 | req->in.args[0].size = sizeof(inarg); | |
1359 | req->in.args[0].value = &inarg; | |
1360 | req->in.args[1].size = strlen(name) + 1; | |
1361 | req->in.args[1].value = name; | |
1362 | req->in.args[2].size = size; | |
1363 | req->in.args[2].value = value; | |
b93f858a | 1364 | fuse_request_send(fc, req); |
92a8780e MS |
1365 | err = req->out.h.error; |
1366 | fuse_put_request(fc, req); | |
1367 | if (err == -ENOSYS) { | |
1368 | fc->no_setxattr = 1; | |
1369 | err = -EOPNOTSUPP; | |
1370 | } | |
1371 | return err; | |
1372 | } | |
1373 | ||
1374 | static ssize_t fuse_getxattr(struct dentry *entry, const char *name, | |
1375 | void *value, size_t size) | |
1376 | { | |
1377 | struct inode *inode = entry->d_inode; | |
1378 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1379 | struct fuse_req *req; | |
1380 | struct fuse_getxattr_in inarg; | |
1381 | struct fuse_getxattr_out outarg; | |
1382 | ssize_t ret; | |
1383 | ||
1384 | if (fc->no_getxattr) | |
1385 | return -EOPNOTSUPP; | |
1386 | ||
ce1d5a49 MS |
1387 | req = fuse_get_req(fc); |
1388 | if (IS_ERR(req)) | |
1389 | return PTR_ERR(req); | |
92a8780e MS |
1390 | |
1391 | memset(&inarg, 0, sizeof(inarg)); | |
1392 | inarg.size = size; | |
1393 | req->in.h.opcode = FUSE_GETXATTR; | |
1394 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1395 | req->in.numargs = 2; |
1396 | req->in.args[0].size = sizeof(inarg); | |
1397 | req->in.args[0].value = &inarg; | |
1398 | req->in.args[1].size = strlen(name) + 1; | |
1399 | req->in.args[1].value = name; | |
1400 | /* This is really two different operations rolled into one */ | |
1401 | req->out.numargs = 1; | |
1402 | if (size) { | |
1403 | req->out.argvar = 1; | |
1404 | req->out.args[0].size = size; | |
1405 | req->out.args[0].value = value; | |
1406 | } else { | |
1407 | req->out.args[0].size = sizeof(outarg); | |
1408 | req->out.args[0].value = &outarg; | |
1409 | } | |
b93f858a | 1410 | fuse_request_send(fc, req); |
92a8780e MS |
1411 | ret = req->out.h.error; |
1412 | if (!ret) | |
1413 | ret = size ? req->out.args[0].size : outarg.size; | |
1414 | else { | |
1415 | if (ret == -ENOSYS) { | |
1416 | fc->no_getxattr = 1; | |
1417 | ret = -EOPNOTSUPP; | |
1418 | } | |
1419 | } | |
1420 | fuse_put_request(fc, req); | |
1421 | return ret; | |
1422 | } | |
1423 | ||
1424 | static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) | |
1425 | { | |
1426 | struct inode *inode = entry->d_inode; | |
1427 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1428 | struct fuse_req *req; | |
1429 | struct fuse_getxattr_in inarg; | |
1430 | struct fuse_getxattr_out outarg; | |
1431 | ssize_t ret; | |
1432 | ||
e57ac683 MS |
1433 | if (!fuse_allow_task(fc, current)) |
1434 | return -EACCES; | |
1435 | ||
92a8780e MS |
1436 | if (fc->no_listxattr) |
1437 | return -EOPNOTSUPP; | |
1438 | ||
ce1d5a49 MS |
1439 | req = fuse_get_req(fc); |
1440 | if (IS_ERR(req)) | |
1441 | return PTR_ERR(req); | |
92a8780e MS |
1442 | |
1443 | memset(&inarg, 0, sizeof(inarg)); | |
1444 | inarg.size = size; | |
1445 | req->in.h.opcode = FUSE_LISTXATTR; | |
1446 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1447 | req->in.numargs = 1; |
1448 | req->in.args[0].size = sizeof(inarg); | |
1449 | req->in.args[0].value = &inarg; | |
1450 | /* This is really two different operations rolled into one */ | |
1451 | req->out.numargs = 1; | |
1452 | if (size) { | |
1453 | req->out.argvar = 1; | |
1454 | req->out.args[0].size = size; | |
1455 | req->out.args[0].value = list; | |
1456 | } else { | |
1457 | req->out.args[0].size = sizeof(outarg); | |
1458 | req->out.args[0].value = &outarg; | |
1459 | } | |
b93f858a | 1460 | fuse_request_send(fc, req); |
92a8780e MS |
1461 | ret = req->out.h.error; |
1462 | if (!ret) | |
1463 | ret = size ? req->out.args[0].size : outarg.size; | |
1464 | else { | |
1465 | if (ret == -ENOSYS) { | |
1466 | fc->no_listxattr = 1; | |
1467 | ret = -EOPNOTSUPP; | |
1468 | } | |
1469 | } | |
1470 | fuse_put_request(fc, req); | |
1471 | return ret; | |
1472 | } | |
1473 | ||
1474 | static int fuse_removexattr(struct dentry *entry, const char *name) | |
1475 | { | |
1476 | struct inode *inode = entry->d_inode; | |
1477 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1478 | struct fuse_req *req; | |
1479 | int err; | |
1480 | ||
1481 | if (fc->no_removexattr) | |
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 | req->in.h.opcode = FUSE_REMOVEXATTR; | |
1489 | req->in.h.nodeid = get_node_id(inode); | |
92a8780e MS |
1490 | req->in.numargs = 1; |
1491 | req->in.args[0].size = strlen(name) + 1; | |
1492 | req->in.args[0].value = name; | |
b93f858a | 1493 | fuse_request_send(fc, req); |
92a8780e MS |
1494 | err = req->out.h.error; |
1495 | fuse_put_request(fc, req); | |
1496 | if (err == -ENOSYS) { | |
1497 | fc->no_removexattr = 1; | |
1498 | err = -EOPNOTSUPP; | |
1499 | } | |
1500 | return err; | |
1501 | } | |
1502 | ||
754661f1 | 1503 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1504 | .lookup = fuse_lookup, |
9e6268db MS |
1505 | .mkdir = fuse_mkdir, |
1506 | .symlink = fuse_symlink, | |
1507 | .unlink = fuse_unlink, | |
1508 | .rmdir = fuse_rmdir, | |
1509 | .rename = fuse_rename, | |
1510 | .link = fuse_link, | |
1511 | .setattr = fuse_setattr, | |
1512 | .create = fuse_create, | |
1513 | .mknod = fuse_mknod, | |
e5e5558e MS |
1514 | .permission = fuse_permission, |
1515 | .getattr = fuse_getattr, | |
92a8780e MS |
1516 | .setxattr = fuse_setxattr, |
1517 | .getxattr = fuse_getxattr, | |
1518 | .listxattr = fuse_listxattr, | |
1519 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1520 | }; |
1521 | ||
4b6f5d20 | 1522 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1523 | .llseek = generic_file_llseek, |
e5e5558e MS |
1524 | .read = generic_read_dir, |
1525 | .readdir = fuse_readdir, | |
1526 | .open = fuse_dir_open, | |
1527 | .release = fuse_dir_release, | |
82547981 | 1528 | .fsync = fuse_dir_fsync, |
e5e5558e MS |
1529 | }; |
1530 | ||
754661f1 | 1531 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1532 | .setattr = fuse_setattr, |
e5e5558e MS |
1533 | .permission = fuse_permission, |
1534 | .getattr = fuse_getattr, | |
92a8780e MS |
1535 | .setxattr = fuse_setxattr, |
1536 | .getxattr = fuse_getxattr, | |
1537 | .listxattr = fuse_listxattr, | |
1538 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1539 | }; |
1540 | ||
754661f1 | 1541 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1542 | .setattr = fuse_setattr, |
e5e5558e MS |
1543 | .follow_link = fuse_follow_link, |
1544 | .put_link = fuse_put_link, | |
1545 | .readlink = generic_readlink, | |
1546 | .getattr = fuse_getattr, | |
92a8780e MS |
1547 | .setxattr = fuse_setxattr, |
1548 | .getxattr = fuse_getxattr, | |
1549 | .listxattr = fuse_listxattr, | |
1550 | .removexattr = fuse_removexattr, | |
e5e5558e MS |
1551 | }; |
1552 | ||
1553 | void fuse_init_common(struct inode *inode) | |
1554 | { | |
1555 | inode->i_op = &fuse_common_inode_operations; | |
1556 | } | |
1557 | ||
1558 | void fuse_init_dir(struct inode *inode) | |
1559 | { | |
1560 | inode->i_op = &fuse_dir_inode_operations; | |
1561 | inode->i_fop = &fuse_dir_operations; | |
1562 | } | |
1563 | ||
1564 | void fuse_init_symlink(struct inode *inode) | |
1565 | { | |
1566 | inode->i_op = &fuse_symlink_inode_operations; | |
1567 | } |