Commit | Line | Data |
---|---|---|
e5e5558e MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
e5e5558e MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/file.h> | |
e5e5558e MS |
13 | #include <linux/sched.h> |
14 | #include <linux/namei.h> | |
07e77dca | 15 | #include <linux/slab.h> |
703c7362 | 16 | #include <linux/xattr.h> |
60bcc88a | 17 | #include <linux/posix_acl.h> |
e5e5558e | 18 | |
8d3af7f3 | 19 | static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx) |
4582a4ab FS |
20 | { |
21 | struct fuse_conn *fc = get_fuse_conn(dir); | |
22 | struct fuse_inode *fi = get_fuse_inode(dir); | |
23 | ||
24 | if (!fc->do_readdirplus) | |
25 | return false; | |
634734b6 EW |
26 | if (!fc->readdirplus_auto) |
27 | return true; | |
4582a4ab FS |
28 | if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state)) |
29 | return true; | |
8d3af7f3 | 30 | if (ctx->pos == 0) |
4582a4ab FS |
31 | return true; |
32 | return false; | |
33 | } | |
34 | ||
35 | static void fuse_advise_use_readdirplus(struct inode *dir) | |
36 | { | |
37 | struct fuse_inode *fi = get_fuse_inode(dir); | |
38 | ||
39 | set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state); | |
40 | } | |
41 | ||
f75fdf22 MS |
42 | union fuse_dentry { |
43 | u64 time; | |
44 | struct rcu_head rcu; | |
45 | }; | |
46 | ||
0a0898cf MS |
47 | static inline void fuse_dentry_settime(struct dentry *entry, u64 time) |
48 | { | |
f75fdf22 | 49 | ((union fuse_dentry *) entry->d_fsdata)->time = time; |
0a0898cf MS |
50 | } |
51 | ||
52 | static inline u64 fuse_dentry_time(struct dentry *entry) | |
53 | { | |
f75fdf22 | 54 | return ((union fuse_dentry *) entry->d_fsdata)->time; |
0a0898cf | 55 | } |
0a0898cf | 56 | |
6f9f1180 MS |
57 | /* |
58 | * FUSE caches dentries and attributes with separate timeout. The | |
59 | * time in jiffies until the dentry/attributes are valid is stored in | |
f75fdf22 | 60 | * dentry->d_fsdata and fuse_inode->i_time respectively. |
6f9f1180 MS |
61 | */ |
62 | ||
63 | /* | |
64 | * Calculate the time in jiffies until a dentry/attributes are valid | |
65 | */ | |
bcb6f6d2 | 66 | static u64 time_to_jiffies(u64 sec, u32 nsec) |
e5e5558e | 67 | { |
685d16dd | 68 | if (sec || nsec) { |
bcb6f6d2 MS |
69 | struct timespec64 ts = { |
70 | sec, | |
71 | max_t(u32, nsec, NSEC_PER_SEC - 1) | |
72 | }; | |
73 | ||
74 | return get_jiffies_64() + timespec64_to_jiffies(&ts); | |
685d16dd | 75 | } else |
0a0898cf | 76 | return 0; |
e5e5558e MS |
77 | } |
78 | ||
6f9f1180 MS |
79 | /* |
80 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
81 | * replies | |
82 | */ | |
1fb69e78 MS |
83 | static void fuse_change_entry_timeout(struct dentry *entry, |
84 | struct fuse_entry_out *o) | |
0aa7c699 | 85 | { |
0a0898cf MS |
86 | fuse_dentry_settime(entry, |
87 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
1fb69e78 MS |
88 | } |
89 | ||
90 | static u64 attr_timeout(struct fuse_attr_out *o) | |
91 | { | |
92 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
93 | } | |
94 | ||
95 | static u64 entry_attr_timeout(struct fuse_entry_out *o) | |
96 | { | |
97 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
8cbdf1e6 MS |
98 | } |
99 | ||
6f9f1180 MS |
100 | /* |
101 | * Mark the attributes as stale, so that at the next call to | |
102 | * ->getattr() they will be fetched from userspace | |
103 | */ | |
8cbdf1e6 MS |
104 | void fuse_invalidate_attr(struct inode *inode) |
105 | { | |
0a0898cf | 106 | get_fuse_inode(inode)->i_time = 0; |
8cbdf1e6 MS |
107 | } |
108 | ||
451418fc AG |
109 | /** |
110 | * Mark the attributes as stale due to an atime change. Avoid the invalidate if | |
111 | * atime is not used. | |
112 | */ | |
113 | void fuse_invalidate_atime(struct inode *inode) | |
114 | { | |
115 | if (!IS_RDONLY(inode)) | |
116 | fuse_invalidate_attr(inode); | |
117 | } | |
118 | ||
6f9f1180 MS |
119 | /* |
120 | * Just mark the entry as stale, so that a next attempt to look it up | |
121 | * will result in a new lookup call to userspace | |
122 | * | |
123 | * This is called when a dentry is about to become negative and the | |
124 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
125 | * lookup) | |
126 | */ | |
dbd561d2 | 127 | void fuse_invalidate_entry_cache(struct dentry *entry) |
8cbdf1e6 | 128 | { |
0a0898cf | 129 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
130 | } |
131 | ||
6f9f1180 MS |
132 | /* |
133 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
134 | * dentry from the hash | |
135 | */ | |
8cbdf1e6 MS |
136 | static void fuse_invalidate_entry(struct dentry *entry) |
137 | { | |
138 | d_invalidate(entry); | |
139 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
140 | } |
141 | ||
7078187a | 142 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, |
13983d06 | 143 | u64 nodeid, const struct qstr *name, |
e5e5558e MS |
144 | struct fuse_entry_out *outarg) |
145 | { | |
0e9663ee | 146 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
7078187a MS |
147 | args->in.h.opcode = FUSE_LOOKUP; |
148 | args->in.h.nodeid = nodeid; | |
149 | args->in.numargs = 1; | |
150 | args->in.args[0].size = name->len + 1; | |
151 | args->in.args[0].value = name->name; | |
152 | args->out.numargs = 1; | |
21f62174 | 153 | args->out.args[0].size = sizeof(struct fuse_entry_out); |
7078187a | 154 | args->out.args[0].value = outarg; |
e5e5558e MS |
155 | } |
156 | ||
5c5c5e51 | 157 | u64 fuse_get_attr_version(struct fuse_conn *fc) |
7dca9fd3 MS |
158 | { |
159 | u64 curr_version; | |
160 | ||
161 | /* | |
162 | * The spin lock isn't actually needed on 64bit archs, but we | |
163 | * don't yet care too much about such optimizations. | |
164 | */ | |
165 | spin_lock(&fc->lock); | |
166 | curr_version = fc->attr_version; | |
167 | spin_unlock(&fc->lock); | |
168 | ||
169 | return curr_version; | |
170 | } | |
171 | ||
6f9f1180 MS |
172 | /* |
173 | * Check whether the dentry is still valid | |
174 | * | |
175 | * If the entry validity timeout has expired and the dentry is | |
176 | * positive, try to redo the lookup. If the lookup results in a | |
177 | * different inode, then let the VFS invalidate the dentry and redo | |
178 | * the lookup once more. If the lookup results in the same inode, | |
179 | * then refresh the attributes, timeouts and mark the dentry valid. | |
180 | */ | |
0b728e19 | 181 | static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) |
e5e5558e | 182 | { |
34286d66 | 183 | struct inode *inode; |
28420dad MS |
184 | struct dentry *parent; |
185 | struct fuse_conn *fc; | |
6314efee | 186 | struct fuse_inode *fi; |
e2a6b952 | 187 | int ret; |
8cbdf1e6 | 188 | |
2b0143b5 | 189 | inode = d_inode_rcu(entry); |
8cbdf1e6 | 190 | if (inode && is_bad_inode(inode)) |
e2a6b952 | 191 | goto invalid; |
154210cc AA |
192 | else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) || |
193 | (flags & LOOKUP_REVAL)) { | |
e5e5558e | 194 | struct fuse_entry_out outarg; |
7078187a | 195 | FUSE_ARGS(args); |
07e77dca | 196 | struct fuse_forget_link *forget; |
1fb69e78 | 197 | u64 attr_version; |
8cbdf1e6 | 198 | |
50322fe7 | 199 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 | 200 | if (!inode) |
e2a6b952 | 201 | goto invalid; |
8cbdf1e6 | 202 | |
e2a6b952 | 203 | ret = -ECHILD; |
0b728e19 | 204 | if (flags & LOOKUP_RCU) |
e2a6b952 | 205 | goto out; |
e7c0a167 | 206 | |
8cbdf1e6 | 207 | fc = get_fuse_conn(inode); |
e5e5558e | 208 | |
07e77dca | 209 | forget = fuse_alloc_forget(); |
7078187a MS |
210 | ret = -ENOMEM; |
211 | if (!forget) | |
e2a6b952 | 212 | goto out; |
2d51013e | 213 | |
7dca9fd3 | 214 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 215 | |
e956edd0 | 216 | parent = dget_parent(entry); |
2b0143b5 | 217 | fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)), |
c180eebe | 218 | &entry->d_name, &outarg); |
7078187a | 219 | ret = fuse_simple_request(fc, &args); |
e956edd0 | 220 | dput(parent); |
50322fe7 | 221 | /* Zero nodeid is same as -ENOENT */ |
7078187a MS |
222 | if (!ret && !outarg.nodeid) |
223 | ret = -ENOENT; | |
224 | if (!ret) { | |
6314efee | 225 | fi = get_fuse_inode(inode); |
9e6268db | 226 | if (outarg.nodeid != get_node_id(inode)) { |
07e77dca | 227 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
e2a6b952 | 228 | goto invalid; |
9e6268db | 229 | } |
8da5ff23 | 230 | spin_lock(&fc->lock); |
1729a16c | 231 | fi->nlookup++; |
8da5ff23 | 232 | spin_unlock(&fc->lock); |
9e6268db | 233 | } |
07e77dca | 234 | kfree(forget); |
7078187a MS |
235 | if (ret == -ENOMEM) |
236 | goto out; | |
237 | if (ret || (outarg.attr.mode ^ inode->i_mode) & S_IFMT) | |
e2a6b952 | 238 | goto invalid; |
e5e5558e | 239 | |
60bcc88a | 240 | forget_all_cached_acls(inode); |
1fb69e78 MS |
241 | fuse_change_attributes(inode, &outarg.attr, |
242 | entry_attr_timeout(&outarg), | |
243 | attr_version); | |
244 | fuse_change_entry_timeout(entry, &outarg); | |
28420dad | 245 | } else if (inode) { |
6314efee MS |
246 | fi = get_fuse_inode(inode); |
247 | if (flags & LOOKUP_RCU) { | |
248 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) | |
249 | return -ECHILD; | |
250 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { | |
28420dad | 251 | parent = dget_parent(entry); |
2b0143b5 | 252 | fuse_advise_use_readdirplus(d_inode(parent)); |
28420dad MS |
253 | dput(parent); |
254 | } | |
e5e5558e | 255 | } |
e2a6b952 MS |
256 | ret = 1; |
257 | out: | |
258 | return ret; | |
259 | ||
260 | invalid: | |
261 | ret = 0; | |
262 | goto out; | |
e5e5558e MS |
263 | } |
264 | ||
8bfc016d | 265 | static int invalid_nodeid(u64 nodeid) |
2827d0b2 MS |
266 | { |
267 | return !nodeid || nodeid == FUSE_ROOT_ID; | |
268 | } | |
269 | ||
f75fdf22 MS |
270 | static int fuse_dentry_init(struct dentry *dentry) |
271 | { | |
272 | dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), GFP_KERNEL); | |
273 | ||
274 | return dentry->d_fsdata ? 0 : -ENOMEM; | |
275 | } | |
276 | static void fuse_dentry_release(struct dentry *dentry) | |
277 | { | |
278 | union fuse_dentry *fd = dentry->d_fsdata; | |
279 | ||
280 | kfree_rcu(fd, rcu); | |
281 | } | |
282 | ||
4269590a | 283 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e | 284 | .d_revalidate = fuse_dentry_revalidate, |
f75fdf22 MS |
285 | .d_init = fuse_dentry_init, |
286 | .d_release = fuse_dentry_release, | |
e5e5558e MS |
287 | }; |
288 | ||
a5bfffac | 289 | int fuse_valid_type(int m) |
39ee059a MS |
290 | { |
291 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
292 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
293 | } | |
294 | ||
13983d06 | 295 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name, |
c180eebe | 296 | struct fuse_entry_out *outarg, struct inode **inode) |
e5e5558e | 297 | { |
c180eebe | 298 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 299 | FUSE_ARGS(args); |
07e77dca | 300 | struct fuse_forget_link *forget; |
1fb69e78 | 301 | u64 attr_version; |
c180eebe | 302 | int err; |
e5e5558e | 303 | |
c180eebe MS |
304 | *inode = NULL; |
305 | err = -ENAMETOOLONG; | |
306 | if (name->len > FUSE_NAME_MAX) | |
307 | goto out; | |
e5e5558e | 308 | |
e5e5558e | 309 | |
07e77dca MS |
310 | forget = fuse_alloc_forget(); |
311 | err = -ENOMEM; | |
7078187a | 312 | if (!forget) |
c180eebe | 313 | goto out; |
2d51013e | 314 | |
7dca9fd3 | 315 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 316 | |
7078187a MS |
317 | fuse_lookup_init(fc, &args, nodeid, name, outarg); |
318 | err = fuse_simple_request(fc, &args); | |
50322fe7 | 319 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
320 | if (err || !outarg->nodeid) |
321 | goto out_put_forget; | |
322 | ||
323 | err = -EIO; | |
324 | if (!outarg->nodeid) | |
325 | goto out_put_forget; | |
326 | if (!fuse_valid_type(outarg->attr.mode)) | |
327 | goto out_put_forget; | |
328 | ||
329 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
330 | &outarg->attr, entry_attr_timeout(outarg), | |
331 | attr_version); | |
332 | err = -ENOMEM; | |
333 | if (!*inode) { | |
07e77dca | 334 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
c180eebe | 335 | goto out; |
e5e5558e | 336 | } |
c180eebe MS |
337 | err = 0; |
338 | ||
339 | out_put_forget: | |
07e77dca | 340 | kfree(forget); |
c180eebe MS |
341 | out: |
342 | return err; | |
343 | } | |
344 | ||
345 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 346 | unsigned int flags) |
c180eebe MS |
347 | { |
348 | int err; | |
349 | struct fuse_entry_out outarg; | |
350 | struct inode *inode; | |
351 | struct dentry *newent; | |
c180eebe MS |
352 | bool outarg_valid = true; |
353 | ||
5c672ab3 | 354 | fuse_lock_inode(dir); |
c180eebe MS |
355 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, |
356 | &outarg, &inode); | |
5c672ab3 | 357 | fuse_unlock_inode(dir); |
c180eebe MS |
358 | if (err == -ENOENT) { |
359 | outarg_valid = false; | |
360 | err = 0; | |
361 | } | |
362 | if (err) | |
363 | goto out_err; | |
364 | ||
365 | err = -EIO; | |
366 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
367 | goto out_iput; | |
e5e5558e | 368 | |
41d28bca | 369 | newent = d_splice_alias(inode, entry); |
5835f339 MS |
370 | err = PTR_ERR(newent); |
371 | if (IS_ERR(newent)) | |
372 | goto out_err; | |
d2a85164 | 373 | |
0de6256d | 374 | entry = newent ? newent : entry; |
c180eebe | 375 | if (outarg_valid) |
1fb69e78 | 376 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
377 | else |
378 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 379 | |
4582a4ab | 380 | fuse_advise_use_readdirplus(dir); |
0de6256d | 381 | return newent; |
c180eebe MS |
382 | |
383 | out_iput: | |
384 | iput(inode); | |
385 | out_err: | |
386 | return ERR_PTR(err); | |
e5e5558e MS |
387 | } |
388 | ||
6f9f1180 MS |
389 | /* |
390 | * Atomic create+open operation | |
391 | * | |
392 | * If the filesystem doesn't support this, then fall back to separate | |
393 | * 'mknod' + 'open' requests. | |
394 | */ | |
d9585277 | 395 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 396 | struct file *file, unsigned flags, |
d9585277 | 397 | umode_t mode, int *opened) |
fd72faac MS |
398 | { |
399 | int err; | |
400 | struct inode *inode; | |
401 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 402 | FUSE_ARGS(args); |
07e77dca | 403 | struct fuse_forget_link *forget; |
e0a43ddc | 404 | struct fuse_create_in inarg; |
fd72faac MS |
405 | struct fuse_open_out outopen; |
406 | struct fuse_entry_out outentry; | |
fd72faac | 407 | struct fuse_file *ff; |
fd72faac | 408 | |
af109bca MS |
409 | /* Userspace expects S_IFREG in create mode */ |
410 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
411 | ||
07e77dca | 412 | forget = fuse_alloc_forget(); |
c8ccbe03 | 413 | err = -ENOMEM; |
07e77dca | 414 | if (!forget) |
c8ccbe03 | 415 | goto out_err; |
51eb01e7 | 416 | |
ce1d5a49 | 417 | err = -ENOMEM; |
acf99433 | 418 | ff = fuse_file_alloc(fc); |
fd72faac | 419 | if (!ff) |
7078187a | 420 | goto out_put_forget_req; |
fd72faac | 421 | |
e0a43ddc MS |
422 | if (!fc->dont_mask) |
423 | mode &= ~current_umask(); | |
424 | ||
fd72faac MS |
425 | flags &= ~O_NOCTTY; |
426 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 427 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
428 | inarg.flags = flags; |
429 | inarg.mode = mode; | |
e0a43ddc | 430 | inarg.umask = current_umask(); |
7078187a MS |
431 | args.in.h.opcode = FUSE_CREATE; |
432 | args.in.h.nodeid = get_node_id(dir); | |
433 | args.in.numargs = 2; | |
21f62174 | 434 | args.in.args[0].size = sizeof(inarg); |
7078187a MS |
435 | args.in.args[0].value = &inarg; |
436 | args.in.args[1].size = entry->d_name.len + 1; | |
437 | args.in.args[1].value = entry->d_name.name; | |
438 | args.out.numargs = 2; | |
21f62174 | 439 | args.out.args[0].size = sizeof(outentry); |
7078187a MS |
440 | args.out.args[0].value = &outentry; |
441 | args.out.args[1].size = sizeof(outopen); | |
442 | args.out.args[1].value = &outopen; | |
443 | err = fuse_simple_request(fc, &args); | |
c8ccbe03 | 444 | if (err) |
fd72faac | 445 | goto out_free_ff; |
fd72faac MS |
446 | |
447 | err = -EIO; | |
2827d0b2 | 448 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid)) |
fd72faac MS |
449 | goto out_free_ff; |
450 | ||
c7b7143c MS |
451 | ff->fh = outopen.fh; |
452 | ff->nodeid = outentry.nodeid; | |
453 | ff->open_flags = outopen.open_flags; | |
fd72faac | 454 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 455 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
456 | if (!inode) { |
457 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
8b0797a4 | 458 | fuse_sync_release(ff, flags); |
07e77dca | 459 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
460 | err = -ENOMEM; |
461 | goto out_err; | |
fd72faac | 462 | } |
07e77dca | 463 | kfree(forget); |
fd72faac | 464 | d_instantiate(entry, inode); |
1fb69e78 | 465 | fuse_change_entry_timeout(entry, &outentry); |
0952b2a4 | 466 | fuse_invalidate_attr(dir); |
30d90494 AV |
467 | err = finish_open(file, entry, generic_file_open, opened); |
468 | if (err) { | |
8b0797a4 | 469 | fuse_sync_release(ff, flags); |
c8ccbe03 MS |
470 | } else { |
471 | file->private_data = fuse_file_get(ff); | |
472 | fuse_finish_open(inode, file); | |
fd72faac | 473 | } |
d9585277 | 474 | return err; |
fd72faac | 475 | |
c8ccbe03 | 476 | out_free_ff: |
fd72faac | 477 | fuse_file_free(ff); |
c8ccbe03 | 478 | out_put_forget_req: |
07e77dca | 479 | kfree(forget); |
c8ccbe03 | 480 | out_err: |
d9585277 | 481 | return err; |
c8ccbe03 MS |
482 | } |
483 | ||
484 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 485 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 486 | struct file *file, unsigned flags, |
d9585277 | 487 | umode_t mode, int *opened) |
c8ccbe03 MS |
488 | { |
489 | int err; | |
490 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
491 | struct dentry *res = NULL; |
492 | ||
00699ad8 | 493 | if (d_in_lookup(entry)) { |
00cd8dd3 | 494 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 495 | if (IS_ERR(res)) |
d9585277 | 496 | return PTR_ERR(res); |
c8ccbe03 MS |
497 | |
498 | if (res) | |
499 | entry = res; | |
500 | } | |
501 | ||
2b0143b5 | 502 | if (!(flags & O_CREAT) || d_really_is_positive(entry)) |
c8ccbe03 MS |
503 | goto no_open; |
504 | ||
505 | /* Only creates */ | |
47237687 | 506 | *opened |= FILE_CREATED; |
c8ccbe03 MS |
507 | |
508 | if (fc->no_create) | |
509 | goto mknod; | |
510 | ||
30d90494 | 511 | err = fuse_create_open(dir, entry, file, flags, mode, opened); |
d9585277 | 512 | if (err == -ENOSYS) { |
c8ccbe03 MS |
513 | fc->no_create = 1; |
514 | goto mknod; | |
515 | } | |
516 | out_dput: | |
517 | dput(res); | |
d9585277 | 518 | return err; |
c8ccbe03 MS |
519 | |
520 | mknod: | |
521 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 522 | if (err) |
c8ccbe03 | 523 | goto out_dput; |
c8ccbe03 | 524 | no_open: |
e45198a6 | 525 | return finish_no_open(file, res); |
fd72faac MS |
526 | } |
527 | ||
6f9f1180 MS |
528 | /* |
529 | * Code shared between mknod, mkdir, symlink and link | |
530 | */ | |
7078187a | 531 | static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args, |
9e6268db | 532 | struct inode *dir, struct dentry *entry, |
541af6a0 | 533 | umode_t mode) |
9e6268db MS |
534 | { |
535 | struct fuse_entry_out outarg; | |
536 | struct inode *inode; | |
9e6268db | 537 | int err; |
07e77dca | 538 | struct fuse_forget_link *forget; |
2d51013e | 539 | |
07e77dca | 540 | forget = fuse_alloc_forget(); |
7078187a | 541 | if (!forget) |
07e77dca | 542 | return -ENOMEM; |
9e6268db | 543 | |
0e9663ee | 544 | memset(&outarg, 0, sizeof(outarg)); |
7078187a MS |
545 | args->in.h.nodeid = get_node_id(dir); |
546 | args->out.numargs = 1; | |
21f62174 | 547 | args->out.args[0].size = sizeof(outarg); |
7078187a MS |
548 | args->out.args[0].value = &outarg; |
549 | err = fuse_simple_request(fc, args); | |
2d51013e MS |
550 | if (err) |
551 | goto out_put_forget_req; | |
552 | ||
39ee059a MS |
553 | err = -EIO; |
554 | if (invalid_nodeid(outarg.nodeid)) | |
2d51013e | 555 | goto out_put_forget_req; |
39ee059a MS |
556 | |
557 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 558 | goto out_put_forget_req; |
39ee059a | 559 | |
9e6268db | 560 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 561 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 562 | if (!inode) { |
07e77dca | 563 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
564 | return -ENOMEM; |
565 | } | |
07e77dca | 566 | kfree(forget); |
9e6268db | 567 | |
b70a80e7 MS |
568 | err = d_instantiate_no_diralias(entry, inode); |
569 | if (err) | |
570 | return err; | |
9e6268db | 571 | |
1fb69e78 | 572 | fuse_change_entry_timeout(entry, &outarg); |
9e6268db MS |
573 | fuse_invalidate_attr(dir); |
574 | return 0; | |
39ee059a | 575 | |
2d51013e | 576 | out_put_forget_req: |
07e77dca | 577 | kfree(forget); |
39ee059a | 578 | return err; |
9e6268db MS |
579 | } |
580 | ||
1a67aafb | 581 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
582 | dev_t rdev) |
583 | { | |
584 | struct fuse_mknod_in inarg; | |
585 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 586 | FUSE_ARGS(args); |
9e6268db | 587 | |
e0a43ddc MS |
588 | if (!fc->dont_mask) |
589 | mode &= ~current_umask(); | |
590 | ||
9e6268db MS |
591 | memset(&inarg, 0, sizeof(inarg)); |
592 | inarg.mode = mode; | |
593 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 594 | inarg.umask = current_umask(); |
7078187a MS |
595 | args.in.h.opcode = FUSE_MKNOD; |
596 | args.in.numargs = 2; | |
21f62174 | 597 | args.in.args[0].size = sizeof(inarg); |
7078187a MS |
598 | args.in.args[0].value = &inarg; |
599 | args.in.args[1].size = entry->d_name.len + 1; | |
600 | args.in.args[1].value = entry->d_name.name; | |
601 | return create_new_entry(fc, &args, dir, entry, mode); | |
9e6268db MS |
602 | } |
603 | ||
4acdaf27 | 604 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
ebfc3b49 | 605 | bool excl) |
9e6268db MS |
606 | { |
607 | return fuse_mknod(dir, entry, mode, 0); | |
608 | } | |
609 | ||
18bb1db3 | 610 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
611 | { |
612 | struct fuse_mkdir_in inarg; | |
613 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 614 | FUSE_ARGS(args); |
9e6268db | 615 | |
e0a43ddc MS |
616 | if (!fc->dont_mask) |
617 | mode &= ~current_umask(); | |
618 | ||
9e6268db MS |
619 | memset(&inarg, 0, sizeof(inarg)); |
620 | inarg.mode = mode; | |
e0a43ddc | 621 | inarg.umask = current_umask(); |
7078187a MS |
622 | args.in.h.opcode = FUSE_MKDIR; |
623 | args.in.numargs = 2; | |
624 | args.in.args[0].size = sizeof(inarg); | |
625 | args.in.args[0].value = &inarg; | |
626 | args.in.args[1].size = entry->d_name.len + 1; | |
627 | args.in.args[1].value = entry->d_name.name; | |
628 | return create_new_entry(fc, &args, dir, entry, S_IFDIR); | |
9e6268db MS |
629 | } |
630 | ||
631 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
632 | const char *link) | |
633 | { | |
634 | struct fuse_conn *fc = get_fuse_conn(dir); | |
635 | unsigned len = strlen(link) + 1; | |
7078187a | 636 | FUSE_ARGS(args); |
9e6268db | 637 | |
7078187a MS |
638 | args.in.h.opcode = FUSE_SYMLINK; |
639 | args.in.numargs = 2; | |
640 | args.in.args[0].size = entry->d_name.len + 1; | |
641 | args.in.args[0].value = entry->d_name.name; | |
642 | args.in.args[1].size = len; | |
643 | args.in.args[1].value = link; | |
644 | return create_new_entry(fc, &args, dir, entry, S_IFLNK); | |
9e6268db MS |
645 | } |
646 | ||
703c7362 | 647 | void fuse_update_ctime(struct inode *inode) |
31f3267b MP |
648 | { |
649 | if (!IS_NOCMTIME(inode)) { | |
c2050a45 | 650 | inode->i_ctime = current_time(inode); |
31f3267b MP |
651 | mark_inode_dirty_sync(inode); |
652 | } | |
653 | } | |
654 | ||
9e6268db MS |
655 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
656 | { | |
657 | int err; | |
658 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a MS |
659 | FUSE_ARGS(args); |
660 | ||
661 | args.in.h.opcode = FUSE_UNLINK; | |
662 | args.in.h.nodeid = get_node_id(dir); | |
663 | args.in.numargs = 1; | |
664 | args.in.args[0].size = entry->d_name.len + 1; | |
665 | args.in.args[0].value = entry->d_name.name; | |
666 | err = fuse_simple_request(fc, &args); | |
9e6268db | 667 | if (!err) { |
2b0143b5 | 668 | struct inode *inode = d_inode(entry); |
ac45d613 | 669 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 670 | |
ac45d613 MS |
671 | spin_lock(&fc->lock); |
672 | fi->attr_version = ++fc->attr_version; | |
dfca7ceb MS |
673 | /* |
674 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
675 | * happen if userspace filesystem is careless. It would be | |
676 | * difficult to enforce correct nlink usage so just ignore this | |
677 | * condition here | |
678 | */ | |
679 | if (inode->i_nlink > 0) | |
680 | drop_nlink(inode); | |
ac45d613 | 681 | spin_unlock(&fc->lock); |
9e6268db MS |
682 | fuse_invalidate_attr(inode); |
683 | fuse_invalidate_attr(dir); | |
8cbdf1e6 | 684 | fuse_invalidate_entry_cache(entry); |
31f3267b | 685 | fuse_update_ctime(inode); |
9e6268db MS |
686 | } else if (err == -EINTR) |
687 | fuse_invalidate_entry(entry); | |
688 | return err; | |
689 | } | |
690 | ||
691 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
692 | { | |
693 | int err; | |
694 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a MS |
695 | FUSE_ARGS(args); |
696 | ||
697 | args.in.h.opcode = FUSE_RMDIR; | |
698 | args.in.h.nodeid = get_node_id(dir); | |
699 | args.in.numargs = 1; | |
700 | args.in.args[0].size = entry->d_name.len + 1; | |
701 | args.in.args[0].value = entry->d_name.name; | |
702 | err = fuse_simple_request(fc, &args); | |
9e6268db | 703 | if (!err) { |
2b0143b5 | 704 | clear_nlink(d_inode(entry)); |
9e6268db | 705 | fuse_invalidate_attr(dir); |
8cbdf1e6 | 706 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
707 | } else if (err == -EINTR) |
708 | fuse_invalidate_entry(entry); | |
709 | return err; | |
710 | } | |
711 | ||
1560c974 MS |
712 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
713 | struct inode *newdir, struct dentry *newent, | |
714 | unsigned int flags, int opcode, size_t argsize) | |
9e6268db MS |
715 | { |
716 | int err; | |
1560c974 | 717 | struct fuse_rename2_in inarg; |
9e6268db | 718 | struct fuse_conn *fc = get_fuse_conn(olddir); |
7078187a | 719 | FUSE_ARGS(args); |
9e6268db | 720 | |
1560c974 | 721 | memset(&inarg, 0, argsize); |
9e6268db | 722 | inarg.newdir = get_node_id(newdir); |
1560c974 | 723 | inarg.flags = flags; |
7078187a MS |
724 | args.in.h.opcode = opcode; |
725 | args.in.h.nodeid = get_node_id(olddir); | |
726 | args.in.numargs = 3; | |
727 | args.in.args[0].size = argsize; | |
728 | args.in.args[0].value = &inarg; | |
729 | args.in.args[1].size = oldent->d_name.len + 1; | |
730 | args.in.args[1].value = oldent->d_name.name; | |
731 | args.in.args[2].size = newent->d_name.len + 1; | |
732 | args.in.args[2].value = newent->d_name.name; | |
733 | err = fuse_simple_request(fc, &args); | |
9e6268db | 734 | if (!err) { |
08b63307 | 735 | /* ctime changes */ |
2b0143b5 DH |
736 | fuse_invalidate_attr(d_inode(oldent)); |
737 | fuse_update_ctime(d_inode(oldent)); | |
08b63307 | 738 | |
1560c974 | 739 | if (flags & RENAME_EXCHANGE) { |
2b0143b5 DH |
740 | fuse_invalidate_attr(d_inode(newent)); |
741 | fuse_update_ctime(d_inode(newent)); | |
1560c974 MS |
742 | } |
743 | ||
9e6268db MS |
744 | fuse_invalidate_attr(olddir); |
745 | if (olddir != newdir) | |
746 | fuse_invalidate_attr(newdir); | |
8cbdf1e6 MS |
747 | |
748 | /* newent will end up negative */ | |
2b0143b5 DH |
749 | if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) { |
750 | fuse_invalidate_attr(d_inode(newent)); | |
8cbdf1e6 | 751 | fuse_invalidate_entry_cache(newent); |
2b0143b5 | 752 | fuse_update_ctime(d_inode(newent)); |
5219f346 | 753 | } |
9e6268db MS |
754 | } else if (err == -EINTR) { |
755 | /* If request was interrupted, DEITY only knows if the | |
756 | rename actually took place. If the invalidation | |
757 | fails (e.g. some process has CWD under the renamed | |
758 | directory), then there can be inconsistency between | |
759 | the dcache and the real filesystem. Tough luck. */ | |
760 | fuse_invalidate_entry(oldent); | |
2b0143b5 | 761 | if (d_really_is_positive(newent)) |
9e6268db MS |
762 | fuse_invalidate_entry(newent); |
763 | } | |
764 | ||
765 | return err; | |
766 | } | |
767 | ||
1560c974 MS |
768 | static int fuse_rename2(struct inode *olddir, struct dentry *oldent, |
769 | struct inode *newdir, struct dentry *newent, | |
770 | unsigned int flags) | |
771 | { | |
772 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
773 | int err; | |
774 | ||
775 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) | |
776 | return -EINVAL; | |
777 | ||
4237ba43 MS |
778 | if (flags) { |
779 | if (fc->no_rename2 || fc->minor < 23) | |
780 | return -EINVAL; | |
1560c974 | 781 | |
4237ba43 MS |
782 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, |
783 | FUSE_RENAME2, | |
784 | sizeof(struct fuse_rename2_in)); | |
785 | if (err == -ENOSYS) { | |
786 | fc->no_rename2 = 1; | |
787 | err = -EINVAL; | |
788 | } | |
789 | } else { | |
790 | err = fuse_rename_common(olddir, oldent, newdir, newent, 0, | |
791 | FUSE_RENAME, | |
792 | sizeof(struct fuse_rename_in)); | |
1560c974 | 793 | } |
4237ba43 | 794 | |
1560c974 | 795 | return err; |
4237ba43 | 796 | } |
1560c974 | 797 | |
9e6268db MS |
798 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
799 | struct dentry *newent) | |
800 | { | |
801 | int err; | |
802 | struct fuse_link_in inarg; | |
2b0143b5 | 803 | struct inode *inode = d_inode(entry); |
9e6268db | 804 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 805 | FUSE_ARGS(args); |
9e6268db MS |
806 | |
807 | memset(&inarg, 0, sizeof(inarg)); | |
808 | inarg.oldnodeid = get_node_id(inode); | |
7078187a MS |
809 | args.in.h.opcode = FUSE_LINK; |
810 | args.in.numargs = 2; | |
811 | args.in.args[0].size = sizeof(inarg); | |
812 | args.in.args[0].value = &inarg; | |
813 | args.in.args[1].size = newent->d_name.len + 1; | |
814 | args.in.args[1].value = newent->d_name.name; | |
815 | err = create_new_entry(fc, &args, newdir, newent, inode->i_mode); | |
9e6268db MS |
816 | /* Contrary to "normal" filesystems it can happen that link |
817 | makes two "logical" inodes point to the same "physical" | |
818 | inode. We invalidate the attributes of the old one, so it | |
819 | will reflect changes in the backing inode (link count, | |
820 | etc.) | |
821 | */ | |
ac45d613 MS |
822 | if (!err) { |
823 | struct fuse_inode *fi = get_fuse_inode(inode); | |
824 | ||
825 | spin_lock(&fc->lock); | |
826 | fi->attr_version = ++fc->attr_version; | |
827 | inc_nlink(inode); | |
828 | spin_unlock(&fc->lock); | |
9e6268db | 829 | fuse_invalidate_attr(inode); |
31f3267b | 830 | fuse_update_ctime(inode); |
ac45d613 MS |
831 | } else if (err == -EINTR) { |
832 | fuse_invalidate_attr(inode); | |
833 | } | |
9e6268db MS |
834 | return err; |
835 | } | |
836 | ||
1fb69e78 MS |
837 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
838 | struct kstat *stat) | |
839 | { | |
203627bb | 840 | unsigned int blkbits; |
8373200b PE |
841 | struct fuse_conn *fc = get_fuse_conn(inode); |
842 | ||
843 | /* see the comment in fuse_change_attributes() */ | |
b0aa7606 | 844 | if (fc->writeback_cache && S_ISREG(inode->i_mode)) { |
8373200b | 845 | attr->size = i_size_read(inode); |
b0aa7606 MP |
846 | attr->mtime = inode->i_mtime.tv_sec; |
847 | attr->mtimensec = inode->i_mtime.tv_nsec; | |
31f3267b MP |
848 | attr->ctime = inode->i_ctime.tv_sec; |
849 | attr->ctimensec = inode->i_ctime.tv_nsec; | |
b0aa7606 | 850 | } |
203627bb | 851 | |
1fb69e78 MS |
852 | stat->dev = inode->i_sb->s_dev; |
853 | stat->ino = attr->ino; | |
854 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
855 | stat->nlink = attr->nlink; | |
499dcf20 EB |
856 | stat->uid = make_kuid(&init_user_ns, attr->uid); |
857 | stat->gid = make_kgid(&init_user_ns, attr->gid); | |
1fb69e78 MS |
858 | stat->rdev = inode->i_rdev; |
859 | stat->atime.tv_sec = attr->atime; | |
860 | stat->atime.tv_nsec = attr->atimensec; | |
861 | stat->mtime.tv_sec = attr->mtime; | |
862 | stat->mtime.tv_nsec = attr->mtimensec; | |
863 | stat->ctime.tv_sec = attr->ctime; | |
864 | stat->ctime.tv_nsec = attr->ctimensec; | |
865 | stat->size = attr->size; | |
866 | stat->blocks = attr->blocks; | |
203627bb MS |
867 | |
868 | if (attr->blksize != 0) | |
869 | blkbits = ilog2(attr->blksize); | |
870 | else | |
871 | blkbits = inode->i_sb->s_blocksize_bits; | |
872 | ||
873 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
874 | } |
875 | ||
c79e322f MS |
876 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
877 | struct file *file) | |
e5e5558e MS |
878 | { |
879 | int err; | |
c79e322f MS |
880 | struct fuse_getattr_in inarg; |
881 | struct fuse_attr_out outarg; | |
e5e5558e | 882 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 883 | FUSE_ARGS(args); |
1fb69e78 MS |
884 | u64 attr_version; |
885 | ||
7dca9fd3 | 886 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 887 | |
c79e322f | 888 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 889 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
890 | /* Directories have separate file-handle space */ |
891 | if (file && S_ISREG(inode->i_mode)) { | |
892 | struct fuse_file *ff = file->private_data; | |
893 | ||
894 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
895 | inarg.fh = ff->fh; | |
896 | } | |
7078187a MS |
897 | args.in.h.opcode = FUSE_GETATTR; |
898 | args.in.h.nodeid = get_node_id(inode); | |
899 | args.in.numargs = 1; | |
900 | args.in.args[0].size = sizeof(inarg); | |
901 | args.in.args[0].value = &inarg; | |
902 | args.out.numargs = 1; | |
21f62174 | 903 | args.out.args[0].size = sizeof(outarg); |
7078187a MS |
904 | args.out.args[0].value = &outarg; |
905 | err = fuse_simple_request(fc, &args); | |
e5e5558e | 906 | if (!err) { |
c79e322f | 907 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
e5e5558e MS |
908 | make_bad_inode(inode); |
909 | err = -EIO; | |
910 | } else { | |
c79e322f MS |
911 | fuse_change_attributes(inode, &outarg.attr, |
912 | attr_timeout(&outarg), | |
1fb69e78 MS |
913 | attr_version); |
914 | if (stat) | |
c79e322f | 915 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
916 | } |
917 | } | |
918 | return err; | |
919 | } | |
920 | ||
bcb4be80 MS |
921 | int fuse_update_attributes(struct inode *inode, struct kstat *stat, |
922 | struct file *file, bool *refreshed) | |
923 | { | |
924 | struct fuse_inode *fi = get_fuse_inode(inode); | |
925 | int err; | |
926 | bool r; | |
927 | ||
126b9d43 | 928 | if (time_before64(fi->i_time, get_jiffies_64())) { |
bcb4be80 | 929 | r = true; |
60bcc88a | 930 | forget_all_cached_acls(inode); |
bcb4be80 MS |
931 | err = fuse_do_getattr(inode, stat, file); |
932 | } else { | |
933 | r = false; | |
934 | err = 0; | |
935 | if (stat) { | |
936 | generic_fillattr(inode, stat); | |
937 | stat->mode = fi->orig_i_mode; | |
45c72cd7 | 938 | stat->ino = fi->orig_ino; |
bcb4be80 MS |
939 | } |
940 | } | |
941 | ||
942 | if (refreshed != NULL) | |
943 | *refreshed = r; | |
944 | ||
945 | return err; | |
946 | } | |
947 | ||
3b463ae0 | 948 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 949 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
950 | { |
951 | int err = -ENOTDIR; | |
952 | struct inode *parent; | |
953 | struct dentry *dir; | |
954 | struct dentry *entry; | |
955 | ||
956 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
957 | if (!parent) | |
958 | return -ENOENT; | |
959 | ||
5955102c | 960 | inode_lock(parent); |
3b463ae0 JM |
961 | if (!S_ISDIR(parent->i_mode)) |
962 | goto unlock; | |
963 | ||
964 | err = -ENOENT; | |
965 | dir = d_find_alias(parent); | |
966 | if (!dir) | |
967 | goto unlock; | |
968 | ||
8387ff25 | 969 | name->hash = full_name_hash(dir, name->name, name->len); |
3b463ae0 JM |
970 | entry = d_lookup(dir, name); |
971 | dput(dir); | |
972 | if (!entry) | |
973 | goto unlock; | |
974 | ||
975 | fuse_invalidate_attr(parent); | |
976 | fuse_invalidate_entry(entry); | |
451d0f59 | 977 | |
2b0143b5 | 978 | if (child_nodeid != 0 && d_really_is_positive(entry)) { |
5955102c | 979 | inode_lock(d_inode(entry)); |
2b0143b5 | 980 | if (get_node_id(d_inode(entry)) != child_nodeid) { |
451d0f59 JM |
981 | err = -ENOENT; |
982 | goto badentry; | |
983 | } | |
984 | if (d_mountpoint(entry)) { | |
985 | err = -EBUSY; | |
986 | goto badentry; | |
987 | } | |
e36cb0b8 | 988 | if (d_is_dir(entry)) { |
451d0f59 JM |
989 | shrink_dcache_parent(entry); |
990 | if (!simple_empty(entry)) { | |
991 | err = -ENOTEMPTY; | |
992 | goto badentry; | |
993 | } | |
2b0143b5 | 994 | d_inode(entry)->i_flags |= S_DEAD; |
451d0f59 JM |
995 | } |
996 | dont_mount(entry); | |
2b0143b5 | 997 | clear_nlink(d_inode(entry)); |
451d0f59 JM |
998 | err = 0; |
999 | badentry: | |
5955102c | 1000 | inode_unlock(d_inode(entry)); |
451d0f59 JM |
1001 | if (!err) |
1002 | d_delete(entry); | |
1003 | } else { | |
1004 | err = 0; | |
1005 | } | |
3b463ae0 | 1006 | dput(entry); |
3b463ae0 JM |
1007 | |
1008 | unlock: | |
5955102c | 1009 | inode_unlock(parent); |
3b463ae0 JM |
1010 | iput(parent); |
1011 | return err; | |
1012 | } | |
1013 | ||
87729a55 MS |
1014 | /* |
1015 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1016 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1017 | * means, that the filesystem daemon is able to record the exact |
1018 | * filesystem operations performed, and can also control the behavior | |
1019 | * of the requester process in otherwise impossible ways. For example | |
1020 | * it can delay the operation for arbitrary length of time allowing | |
1021 | * DoS against the requester. | |
1022 | * | |
1023 | * For this reason only those processes can call into the filesystem, | |
1024 | * for which the owner of the mount has ptrace privilege. This | |
1025 | * excludes processes started by other users, suid or sgid processes. | |
1026 | */ | |
c2132c1b | 1027 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1028 | { |
c69e8d9c | 1029 | const struct cred *cred; |
87729a55 | 1030 | |
29433a29 | 1031 | if (fc->allow_other) |
87729a55 MS |
1032 | return 1; |
1033 | ||
c2132c1b | 1034 | cred = current_cred(); |
499dcf20 EB |
1035 | if (uid_eq(cred->euid, fc->user_id) && |
1036 | uid_eq(cred->suid, fc->user_id) && | |
1037 | uid_eq(cred->uid, fc->user_id) && | |
1038 | gid_eq(cred->egid, fc->group_id) && | |
1039 | gid_eq(cred->sgid, fc->group_id) && | |
1040 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1041 | return 1; |
c69e8d9c | 1042 | |
c2132c1b | 1043 | return 0; |
87729a55 MS |
1044 | } |
1045 | ||
31d40d74 MS |
1046 | static int fuse_access(struct inode *inode, int mask) |
1047 | { | |
1048 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 1049 | FUSE_ARGS(args); |
31d40d74 MS |
1050 | struct fuse_access_in inarg; |
1051 | int err; | |
1052 | ||
698fa1d1 MS |
1053 | BUG_ON(mask & MAY_NOT_BLOCK); |
1054 | ||
31d40d74 MS |
1055 | if (fc->no_access) |
1056 | return 0; | |
1057 | ||
31d40d74 | 1058 | memset(&inarg, 0, sizeof(inarg)); |
e6305c43 | 1059 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
7078187a MS |
1060 | args.in.h.opcode = FUSE_ACCESS; |
1061 | args.in.h.nodeid = get_node_id(inode); | |
1062 | args.in.numargs = 1; | |
1063 | args.in.args[0].size = sizeof(inarg); | |
1064 | args.in.args[0].value = &inarg; | |
1065 | err = fuse_simple_request(fc, &args); | |
31d40d74 MS |
1066 | if (err == -ENOSYS) { |
1067 | fc->no_access = 1; | |
1068 | err = 0; | |
1069 | } | |
1070 | return err; | |
1071 | } | |
1072 | ||
10556cb2 | 1073 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1074 | { |
10556cb2 | 1075 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1076 | return -ECHILD; |
1077 | ||
60bcc88a | 1078 | forget_all_cached_acls(inode); |
19690ddb MS |
1079 | return fuse_do_getattr(inode, NULL, NULL); |
1080 | } | |
1081 | ||
6f9f1180 MS |
1082 | /* |
1083 | * Check permission. The two basic access models of FUSE are: | |
1084 | * | |
1085 | * 1) Local access checking ('default_permissions' mount option) based | |
1086 | * on file mode. This is the plain old disk filesystem permission | |
1087 | * modell. | |
1088 | * | |
1089 | * 2) "Remote" access checking, where server is responsible for | |
1090 | * checking permission in each inode operation. An exception to this | |
1091 | * is if ->permission() was invoked from sys_access() in which case an | |
1092 | * access request is sent. Execute permission is still checked | |
1093 | * locally based on file mode. | |
1094 | */ | |
10556cb2 | 1095 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1096 | { |
1097 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1098 | bool refreshed = false; |
1099 | int err = 0; | |
e5e5558e | 1100 | |
c2132c1b | 1101 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1102 | return -EACCES; |
244f6385 MS |
1103 | |
1104 | /* | |
e8e96157 | 1105 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1106 | */ |
29433a29 | 1107 | if (fc->default_permissions || |
e8e96157 | 1108 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { |
19690ddb MS |
1109 | struct fuse_inode *fi = get_fuse_inode(inode); |
1110 | ||
126b9d43 | 1111 | if (time_before64(fi->i_time, get_jiffies_64())) { |
19690ddb MS |
1112 | refreshed = true; |
1113 | ||
10556cb2 | 1114 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1115 | if (err) |
1116 | return err; | |
1117 | } | |
244f6385 MS |
1118 | } |
1119 | ||
29433a29 | 1120 | if (fc->default_permissions) { |
2830ba7f | 1121 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1122 | |
1123 | /* If permission is denied, try to refresh file | |
1124 | attributes. This is also needed, because the root | |
1125 | node will at first have no permissions */ | |
244f6385 | 1126 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1127 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1128 | if (!err) |
2830ba7f | 1129 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1130 | } |
1131 | ||
6f9f1180 MS |
1132 | /* Note: the opposite of the above test does not |
1133 | exist. So if permissions are revoked this won't be | |
1134 | noticed immediately, only after the attribute | |
1135 | timeout has expired */ | |
9cfcac81 | 1136 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1137 | err = fuse_access(inode, mask); |
1138 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1139 | if (!(inode->i_mode & S_IXUGO)) { | |
1140 | if (refreshed) | |
1141 | return -EACCES; | |
1142 | ||
10556cb2 | 1143 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1144 | if (!err && !(inode->i_mode & S_IXUGO)) |
1145 | return -EACCES; | |
1146 | } | |
e5e5558e | 1147 | } |
244f6385 | 1148 | return err; |
e5e5558e MS |
1149 | } |
1150 | ||
1151 | static int parse_dirfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1152 | struct dir_context *ctx) |
e5e5558e MS |
1153 | { |
1154 | while (nbytes >= FUSE_NAME_OFFSET) { | |
1155 | struct fuse_dirent *dirent = (struct fuse_dirent *) buf; | |
1156 | size_t reclen = FUSE_DIRENT_SIZE(dirent); | |
e5e5558e MS |
1157 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) |
1158 | return -EIO; | |
1159 | if (reclen > nbytes) | |
1160 | break; | |
efeb9e60 MS |
1161 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1162 | return -EIO; | |
e5e5558e | 1163 | |
8d3af7f3 AV |
1164 | if (!dir_emit(ctx, dirent->name, dirent->namelen, |
1165 | dirent->ino, dirent->type)) | |
e5e5558e MS |
1166 | break; |
1167 | ||
1168 | buf += reclen; | |
1169 | nbytes -= reclen; | |
8d3af7f3 | 1170 | ctx->pos = dirent->off; |
e5e5558e MS |
1171 | } |
1172 | ||
1173 | return 0; | |
1174 | } | |
1175 | ||
0b05b183 AA |
1176 | static int fuse_direntplus_link(struct file *file, |
1177 | struct fuse_direntplus *direntplus, | |
1178 | u64 attr_version) | |
1179 | { | |
0b05b183 AA |
1180 | struct fuse_entry_out *o = &direntplus->entry_out; |
1181 | struct fuse_dirent *dirent = &direntplus->dirent; | |
1182 | struct dentry *parent = file->f_path.dentry; | |
1183 | struct qstr name = QSTR_INIT(dirent->name, dirent->namelen); | |
1184 | struct dentry *dentry; | |
1185 | struct dentry *alias; | |
2b0143b5 | 1186 | struct inode *dir = d_inode(parent); |
0b05b183 AA |
1187 | struct fuse_conn *fc; |
1188 | struct inode *inode; | |
d9b3dbdc | 1189 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
0b05b183 AA |
1190 | |
1191 | if (!o->nodeid) { | |
1192 | /* | |
1193 | * Unlike in the case of fuse_lookup, zero nodeid does not mean | |
1194 | * ENOENT. Instead, it only means the userspace filesystem did | |
1195 | * not want to return attributes/handle for this entry. | |
1196 | * | |
1197 | * So do nothing. | |
1198 | */ | |
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | if (name.name[0] == '.') { | |
1203 | /* | |
1204 | * We could potentially refresh the attributes of the directory | |
1205 | * and its parent? | |
1206 | */ | |
1207 | if (name.len == 1) | |
1208 | return 0; | |
1209 | if (name.name[1] == '.' && name.len == 2) | |
1210 | return 0; | |
1211 | } | |
a28ef45c MS |
1212 | |
1213 | if (invalid_nodeid(o->nodeid)) | |
1214 | return -EIO; | |
1215 | if (!fuse_valid_type(o->attr.mode)) | |
1216 | return -EIO; | |
1217 | ||
0b05b183 AA |
1218 | fc = get_fuse_conn(dir); |
1219 | ||
8387ff25 | 1220 | name.hash = full_name_hash(parent, name.name, name.len); |
0b05b183 | 1221 | dentry = d_lookup(parent, &name); |
d9b3dbdc AV |
1222 | if (!dentry) { |
1223 | retry: | |
1224 | dentry = d_alloc_parallel(parent, &name, &wq); | |
1225 | if (IS_ERR(dentry)) | |
1226 | return PTR_ERR(dentry); | |
1227 | } | |
1228 | if (!d_in_lookup(dentry)) { | |
1229 | struct fuse_inode *fi; | |
2b0143b5 | 1230 | inode = d_inode(dentry); |
d9b3dbdc AV |
1231 | if (!inode || |
1232 | get_node_id(inode) != o->nodeid || | |
1233 | ((o->attr.mode ^ inode->i_mode) & S_IFMT)) { | |
5542aa2f | 1234 | d_invalidate(dentry); |
d9b3dbdc AV |
1235 | dput(dentry); |
1236 | goto retry; | |
1237 | } | |
1238 | if (is_bad_inode(inode)) { | |
1239 | dput(dentry); | |
1240 | return -EIO; | |
0b05b183 | 1241 | } |
0b05b183 | 1242 | |
d9b3dbdc AV |
1243 | fi = get_fuse_inode(inode); |
1244 | spin_lock(&fc->lock); | |
1245 | fi->nlookup++; | |
1246 | spin_unlock(&fc->lock); | |
0b05b183 | 1247 | |
60bcc88a | 1248 | forget_all_cached_acls(inode); |
d9b3dbdc AV |
1249 | fuse_change_attributes(inode, &o->attr, |
1250 | entry_attr_timeout(o), | |
1251 | attr_version); | |
1252 | /* | |
1253 | * The other branch comes via fuse_iget() | |
1254 | * which bumps nlookup inside | |
1255 | */ | |
1256 | } else { | |
1257 | inode = fuse_iget(dir->i_sb, o->nodeid, o->generation, | |
1258 | &o->attr, entry_attr_timeout(o), | |
1259 | attr_version); | |
1260 | if (!inode) | |
1261 | inode = ERR_PTR(-ENOMEM); | |
2914941e | 1262 | |
d9b3dbdc AV |
1263 | alias = d_splice_alias(inode, dentry); |
1264 | d_lookup_done(dentry); | |
1265 | if (alias) { | |
1266 | dput(dentry); | |
1267 | dentry = alias; | |
1268 | } | |
1269 | if (IS_ERR(dentry)) | |
1270 | return PTR_ERR(dentry); | |
0b05b183 | 1271 | } |
6314efee MS |
1272 | if (fc->readdirplus_auto) |
1273 | set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state); | |
0b05b183 AA |
1274 | fuse_change_entry_timeout(dentry, o); |
1275 | ||
c7263bcd | 1276 | dput(dentry); |
d9b3dbdc | 1277 | return 0; |
0b05b183 AA |
1278 | } |
1279 | ||
1280 | static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file, | |
8d3af7f3 | 1281 | struct dir_context *ctx, u64 attr_version) |
0b05b183 AA |
1282 | { |
1283 | struct fuse_direntplus *direntplus; | |
1284 | struct fuse_dirent *dirent; | |
1285 | size_t reclen; | |
1286 | int over = 0; | |
1287 | int ret; | |
1288 | ||
1289 | while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) { | |
1290 | direntplus = (struct fuse_direntplus *) buf; | |
1291 | dirent = &direntplus->dirent; | |
1292 | reclen = FUSE_DIRENTPLUS_SIZE(direntplus); | |
1293 | ||
1294 | if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX) | |
1295 | return -EIO; | |
1296 | if (reclen > nbytes) | |
1297 | break; | |
efeb9e60 MS |
1298 | if (memchr(dirent->name, '/', dirent->namelen) != NULL) |
1299 | return -EIO; | |
0b05b183 AA |
1300 | |
1301 | if (!over) { | |
1302 | /* We fill entries into dstbuf only as much as | |
1303 | it can hold. But we still continue iterating | |
1304 | over remaining entries to link them. If not, | |
1305 | we need to send a FORGET for each of those | |
1306 | which we did not link. | |
1307 | */ | |
8d3af7f3 AV |
1308 | over = !dir_emit(ctx, dirent->name, dirent->namelen, |
1309 | dirent->ino, dirent->type); | |
1310 | ctx->pos = dirent->off; | |
0b05b183 AA |
1311 | } |
1312 | ||
1313 | buf += reclen; | |
1314 | nbytes -= reclen; | |
1315 | ||
1316 | ret = fuse_direntplus_link(file, direntplus, attr_version); | |
1317 | if (ret) | |
1318 | fuse_force_forget(file, direntplus->entry_out.nodeid); | |
1319 | } | |
1320 | ||
1321 | return 0; | |
1322 | } | |
1323 | ||
8d3af7f3 | 1324 | static int fuse_readdir(struct file *file, struct dir_context *ctx) |
e5e5558e | 1325 | { |
4582a4ab | 1326 | int plus, err; |
04730fef MS |
1327 | size_t nbytes; |
1328 | struct page *page; | |
496ad9aa | 1329 | struct inode *inode = file_inode(file); |
e5e5558e | 1330 | struct fuse_conn *fc = get_fuse_conn(inode); |
248d86e8 | 1331 | struct fuse_req *req; |
0b05b183 | 1332 | u64 attr_version = 0; |
248d86e8 MS |
1333 | |
1334 | if (is_bad_inode(inode)) | |
1335 | return -EIO; | |
1336 | ||
b111c8c0 | 1337 | req = fuse_get_req(fc, 1); |
ce1d5a49 MS |
1338 | if (IS_ERR(req)) |
1339 | return PTR_ERR(req); | |
e5e5558e | 1340 | |
04730fef MS |
1341 | page = alloc_page(GFP_KERNEL); |
1342 | if (!page) { | |
1343 | fuse_put_request(fc, req); | |
1344 | return -ENOMEM; | |
1345 | } | |
4582a4ab | 1346 | |
8d3af7f3 | 1347 | plus = fuse_use_readdirplus(inode, ctx); |
f4975c67 | 1348 | req->out.argpages = 1; |
04730fef MS |
1349 | req->num_pages = 1; |
1350 | req->pages[0] = page; | |
85f40aec | 1351 | req->page_descs[0].length = PAGE_SIZE; |
4582a4ab | 1352 | if (plus) { |
0b05b183 | 1353 | attr_version = fuse_get_attr_version(fc); |
8d3af7f3 | 1354 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1355 | FUSE_READDIRPLUS); |
1356 | } else { | |
8d3af7f3 | 1357 | fuse_read_fill(req, file, ctx->pos, PAGE_SIZE, |
0b05b183 AA |
1358 | FUSE_READDIR); |
1359 | } | |
5c672ab3 | 1360 | fuse_lock_inode(inode); |
b93f858a | 1361 | fuse_request_send(fc, req); |
5c672ab3 | 1362 | fuse_unlock_inode(inode); |
361b1eb5 | 1363 | nbytes = req->out.args[0].size; |
e5e5558e MS |
1364 | err = req->out.h.error; |
1365 | fuse_put_request(fc, req); | |
0b05b183 | 1366 | if (!err) { |
4582a4ab | 1367 | if (plus) { |
0b05b183 | 1368 | err = parse_dirplusfile(page_address(page), nbytes, |
8d3af7f3 | 1369 | file, ctx, |
0b05b183 AA |
1370 | attr_version); |
1371 | } else { | |
1372 | err = parse_dirfile(page_address(page), nbytes, file, | |
8d3af7f3 | 1373 | ctx); |
0b05b183 AA |
1374 | } |
1375 | } | |
e5e5558e | 1376 | |
04730fef | 1377 | __free_page(page); |
451418fc | 1378 | fuse_invalidate_atime(inode); |
04730fef | 1379 | return err; |
e5e5558e MS |
1380 | } |
1381 | ||
6b255391 | 1382 | static const char *fuse_get_link(struct dentry *dentry, |
fceef393 AV |
1383 | struct inode *inode, |
1384 | struct delayed_call *done) | |
e5e5558e | 1385 | { |
e5e5558e | 1386 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 1387 | FUSE_ARGS(args); |
e5e5558e | 1388 | char *link; |
7078187a | 1389 | ssize_t ret; |
e5e5558e | 1390 | |
6b255391 AV |
1391 | if (!dentry) |
1392 | return ERR_PTR(-ECHILD); | |
1393 | ||
cd3417c8 | 1394 | link = kmalloc(PAGE_SIZE, GFP_KERNEL); |
7078187a MS |
1395 | if (!link) |
1396 | return ERR_PTR(-ENOMEM); | |
1397 | ||
1398 | args.in.h.opcode = FUSE_READLINK; | |
1399 | args.in.h.nodeid = get_node_id(inode); | |
1400 | args.out.argvar = 1; | |
1401 | args.out.numargs = 1; | |
1402 | args.out.args[0].size = PAGE_SIZE - 1; | |
1403 | args.out.args[0].value = link; | |
1404 | ret = fuse_simple_request(fc, &args); | |
1405 | if (ret < 0) { | |
cd3417c8 | 1406 | kfree(link); |
7078187a MS |
1407 | link = ERR_PTR(ret); |
1408 | } else { | |
1409 | link[ret] = '\0'; | |
fceef393 | 1410 | set_delayed_call(done, kfree_link, link); |
7078187a | 1411 | } |
451418fc | 1412 | fuse_invalidate_atime(inode); |
e5e5558e MS |
1413 | return link; |
1414 | } | |
1415 | ||
e5e5558e MS |
1416 | static int fuse_dir_open(struct inode *inode, struct file *file) |
1417 | { | |
91fe96b4 | 1418 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1419 | } |
1420 | ||
1421 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1422 | { | |
8b0797a4 MS |
1423 | fuse_release_common(file, FUSE_RELEASEDIR); |
1424 | ||
1425 | return 0; | |
e5e5558e MS |
1426 | } |
1427 | ||
02c24a82 JB |
1428 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1429 | int datasync) | |
82547981 | 1430 | { |
02c24a82 | 1431 | return fuse_fsync_common(file, start, end, datasync, 1); |
82547981 MS |
1432 | } |
1433 | ||
b18da0c5 MS |
1434 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1435 | unsigned long arg) | |
1436 | { | |
1437 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1438 | ||
1439 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1440 | if (fc->minor < 18) | |
1441 | return -ENOTTY; | |
1442 | ||
1443 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1444 | } | |
1445 | ||
1446 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1447 | unsigned long arg) | |
1448 | { | |
1449 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1450 | ||
1451 | if (fc->minor < 18) | |
1452 | return -ENOTTY; | |
1453 | ||
1454 | return fuse_ioctl_common(file, cmd, arg, | |
1455 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1456 | } | |
1457 | ||
b0aa7606 | 1458 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
17637cba MS |
1459 | { |
1460 | /* Always update if mtime is explicitly set */ | |
1461 | if (ivalid & ATTR_MTIME_SET) | |
1462 | return true; | |
1463 | ||
b0aa7606 MP |
1464 | /* Or if kernel i_mtime is the official one */ |
1465 | if (trust_local_mtime) | |
1466 | return true; | |
1467 | ||
17637cba MS |
1468 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
1469 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1470 | return false; | |
1471 | ||
1472 | /* In all other cases update */ | |
1473 | return true; | |
1474 | } | |
1475 | ||
b0aa7606 | 1476 | static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg, |
3ad22c62 | 1477 | bool trust_local_cmtime) |
9e6268db MS |
1478 | { |
1479 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1480 | |
1481 | if (ivalid & ATTR_MODE) | |
befc649c | 1482 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1483 | if (ivalid & ATTR_UID) |
499dcf20 | 1484 | arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid); |
9e6268db | 1485 | if (ivalid & ATTR_GID) |
499dcf20 | 1486 | arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid); |
9e6268db | 1487 | if (ivalid & ATTR_SIZE) |
befc649c | 1488 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1489 | if (ivalid & ATTR_ATIME) { |
1490 | arg->valid |= FATTR_ATIME; | |
befc649c | 1491 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1492 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1493 | if (!(ivalid & ATTR_ATIME_SET)) | |
1494 | arg->valid |= FATTR_ATIME_NOW; | |
1495 | } | |
3ad22c62 | 1496 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
17637cba | 1497 | arg->valid |= FATTR_MTIME; |
befc649c | 1498 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba | 1499 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
3ad22c62 | 1500 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
17637cba | 1501 | arg->valid |= FATTR_MTIME_NOW; |
befc649c | 1502 | } |
3ad22c62 MP |
1503 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
1504 | arg->valid |= FATTR_CTIME; | |
1505 | arg->ctime = iattr->ia_ctime.tv_sec; | |
1506 | arg->ctimensec = iattr->ia_ctime.tv_nsec; | |
1507 | } | |
9e6268db MS |
1508 | } |
1509 | ||
3be5a52b MS |
1510 | /* |
1511 | * Prevent concurrent writepages on inode | |
1512 | * | |
1513 | * This is done by adding a negative bias to the inode write counter | |
1514 | * and waiting for all pending writes to finish. | |
1515 | */ | |
1516 | void fuse_set_nowrite(struct inode *inode) | |
1517 | { | |
1518 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1519 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1520 | ||
5955102c | 1521 | BUG_ON(!inode_is_locked(inode)); |
3be5a52b MS |
1522 | |
1523 | spin_lock(&fc->lock); | |
1524 | BUG_ON(fi->writectr < 0); | |
1525 | fi->writectr += FUSE_NOWRITE; | |
1526 | spin_unlock(&fc->lock); | |
1527 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * Allow writepages on inode | |
1532 | * | |
1533 | * Remove the bias from the writecounter and send any queued | |
1534 | * writepages. | |
1535 | */ | |
1536 | static void __fuse_release_nowrite(struct inode *inode) | |
1537 | { | |
1538 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1539 | ||
1540 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1541 | fi->writectr = 0; | |
1542 | fuse_flush_writepages(inode); | |
1543 | } | |
1544 | ||
1545 | void fuse_release_nowrite(struct inode *inode) | |
1546 | { | |
1547 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1548 | ||
1549 | spin_lock(&fc->lock); | |
1550 | __fuse_release_nowrite(inode); | |
1551 | spin_unlock(&fc->lock); | |
1552 | } | |
1553 | ||
7078187a | 1554 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args, |
b0aa7606 MP |
1555 | struct inode *inode, |
1556 | struct fuse_setattr_in *inarg_p, | |
1557 | struct fuse_attr_out *outarg_p) | |
1558 | { | |
7078187a MS |
1559 | args->in.h.opcode = FUSE_SETATTR; |
1560 | args->in.h.nodeid = get_node_id(inode); | |
1561 | args->in.numargs = 1; | |
1562 | args->in.args[0].size = sizeof(*inarg_p); | |
1563 | args->in.args[0].value = inarg_p; | |
1564 | args->out.numargs = 1; | |
21f62174 | 1565 | args->out.args[0].size = sizeof(*outarg_p); |
7078187a | 1566 | args->out.args[0].value = outarg_p; |
b0aa7606 MP |
1567 | } |
1568 | ||
1569 | /* | |
1570 | * Flush inode->i_mtime to the server | |
1571 | */ | |
ab9e13f7 | 1572 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
b0aa7606 | 1573 | { |
b0aa7606 | 1574 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 1575 | FUSE_ARGS(args); |
b0aa7606 MP |
1576 | struct fuse_setattr_in inarg; |
1577 | struct fuse_attr_out outarg; | |
b0aa7606 MP |
1578 | |
1579 | memset(&inarg, 0, sizeof(inarg)); | |
1580 | memset(&outarg, 0, sizeof(outarg)); | |
1581 | ||
ab9e13f7 | 1582 | inarg.valid = FATTR_MTIME; |
b0aa7606 MP |
1583 | inarg.mtime = inode->i_mtime.tv_sec; |
1584 | inarg.mtimensec = inode->i_mtime.tv_nsec; | |
ab9e13f7 MP |
1585 | if (fc->minor >= 23) { |
1586 | inarg.valid |= FATTR_CTIME; | |
1587 | inarg.ctime = inode->i_ctime.tv_sec; | |
1588 | inarg.ctimensec = inode->i_ctime.tv_nsec; | |
1589 | } | |
1e18bda8 MS |
1590 | if (ff) { |
1591 | inarg.valid |= FATTR_FH; | |
1592 | inarg.fh = ff->fh; | |
1593 | } | |
7078187a | 1594 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
b0aa7606 | 1595 | |
7078187a | 1596 | return fuse_simple_request(fc, &args); |
b0aa7606 MP |
1597 | } |
1598 | ||
6f9f1180 MS |
1599 | /* |
1600 | * Set attributes, and at the same time refresh them. | |
1601 | * | |
1602 | * Truncation is slightly complicated, because the 'truncate' request | |
1603 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1604 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1605 | * and the actual truncation by hand. | |
6f9f1180 | 1606 | */ |
62490330 | 1607 | int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, |
efb9fa9e | 1608 | struct file *file) |
9e6268db | 1609 | { |
62490330 | 1610 | struct inode *inode = d_inode(dentry); |
9e6268db | 1611 | struct fuse_conn *fc = get_fuse_conn(inode); |
06a7c3c2 | 1612 | struct fuse_inode *fi = get_fuse_inode(inode); |
7078187a | 1613 | FUSE_ARGS(args); |
9e6268db MS |
1614 | struct fuse_setattr_in inarg; |
1615 | struct fuse_attr_out outarg; | |
3be5a52b | 1616 | bool is_truncate = false; |
8373200b | 1617 | bool is_wb = fc->writeback_cache; |
3be5a52b | 1618 | loff_t oldsize; |
9e6268db | 1619 | int err; |
3ad22c62 | 1620 | bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode); |
9e6268db | 1621 | |
29433a29 | 1622 | if (!fc->default_permissions) |
db78b877 CH |
1623 | attr->ia_valid |= ATTR_FORCE; |
1624 | ||
31051c85 | 1625 | err = setattr_prepare(dentry, attr); |
db78b877 CH |
1626 | if (err) |
1627 | return err; | |
1e9a4ed9 | 1628 | |
8d56addd MS |
1629 | if (attr->ia_valid & ATTR_OPEN) { |
1630 | if (fc->atomic_o_trunc) | |
1631 | return 0; | |
1632 | file = NULL; | |
1633 | } | |
6ff958ed | 1634 | |
2c27c65e | 1635 | if (attr->ia_valid & ATTR_SIZE) |
3be5a52b | 1636 | is_truncate = true; |
9e6268db | 1637 | |
06a7c3c2 | 1638 | if (is_truncate) { |
3be5a52b | 1639 | fuse_set_nowrite(inode); |
06a7c3c2 | 1640 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3ad22c62 MP |
1641 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
1642 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; | |
06a7c3c2 | 1643 | } |
3be5a52b | 1644 | |
9e6268db | 1645 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1646 | memset(&outarg, 0, sizeof(outarg)); |
3ad22c62 | 1647 | iattr_to_fattr(attr, &inarg, trust_local_cmtime); |
49d4914f MS |
1648 | if (file) { |
1649 | struct fuse_file *ff = file->private_data; | |
1650 | inarg.valid |= FATTR_FH; | |
1651 | inarg.fh = ff->fh; | |
1652 | } | |
f3332114 MS |
1653 | if (attr->ia_valid & ATTR_SIZE) { |
1654 | /* For mandatory locking in truncate */ | |
1655 | inarg.valid |= FATTR_LOCKOWNER; | |
1656 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1657 | } | |
7078187a MS |
1658 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
1659 | err = fuse_simple_request(fc, &args); | |
e00d2c2d MS |
1660 | if (err) { |
1661 | if (err == -EINTR) | |
1662 | fuse_invalidate_attr(inode); | |
3be5a52b | 1663 | goto error; |
e00d2c2d | 1664 | } |
9e6268db | 1665 | |
e00d2c2d MS |
1666 | if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) { |
1667 | make_bad_inode(inode); | |
3be5a52b MS |
1668 | err = -EIO; |
1669 | goto error; | |
1670 | } | |
1671 | ||
1672 | spin_lock(&fc->lock); | |
b0aa7606 | 1673 | /* the kernel maintains i_mtime locally */ |
3ad22c62 MP |
1674 | if (trust_local_cmtime) { |
1675 | if (attr->ia_valid & ATTR_MTIME) | |
1676 | inode->i_mtime = attr->ia_mtime; | |
1677 | if (attr->ia_valid & ATTR_CTIME) | |
1678 | inode->i_ctime = attr->ia_ctime; | |
1e18bda8 | 1679 | /* FIXME: clear I_DIRTY_SYNC? */ |
b0aa7606 MP |
1680 | } |
1681 | ||
3be5a52b MS |
1682 | fuse_change_attributes_common(inode, &outarg.attr, |
1683 | attr_timeout(&outarg)); | |
1684 | oldsize = inode->i_size; | |
8373200b PE |
1685 | /* see the comment in fuse_change_attributes() */ |
1686 | if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) | |
1687 | i_size_write(inode, outarg.attr.size); | |
3be5a52b MS |
1688 | |
1689 | if (is_truncate) { | |
1690 | /* NOTE: this may release/reacquire fc->lock */ | |
1691 | __fuse_release_nowrite(inode); | |
1692 | } | |
1693 | spin_unlock(&fc->lock); | |
1694 | ||
1695 | /* | |
1696 | * Only call invalidate_inode_pages2() after removing | |
1697 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1698 | */ | |
8373200b PE |
1699 | if ((is_truncate || !is_wb) && |
1700 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1701 | truncate_pagecache(inode, outarg.attr.size); |
3be5a52b | 1702 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1703 | } |
1704 | ||
06a7c3c2 | 1705 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
e00d2c2d | 1706 | return 0; |
3be5a52b MS |
1707 | |
1708 | error: | |
1709 | if (is_truncate) | |
1710 | fuse_release_nowrite(inode); | |
1711 | ||
06a7c3c2 | 1712 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3be5a52b | 1713 | return err; |
9e6268db MS |
1714 | } |
1715 | ||
49d4914f MS |
1716 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1717 | { | |
2b0143b5 | 1718 | struct inode *inode = d_inode(entry); |
5e940c1d | 1719 | struct fuse_conn *fc = get_fuse_conn(inode); |
a09f99ed | 1720 | struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL; |
5e2b8828 | 1721 | int ret; |
efb9fa9e MP |
1722 | |
1723 | if (!fuse_allow_current_process(get_fuse_conn(inode))) | |
1724 | return -EACCES; | |
1725 | ||
a09f99ed | 1726 | if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) { |
a09f99ed MS |
1727 | attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | |
1728 | ATTR_MODE); | |
5e940c1d | 1729 | |
a09f99ed | 1730 | /* |
5e940c1d MS |
1731 | * The only sane way to reliably kill suid/sgid is to do it in |
1732 | * the userspace filesystem | |
1733 | * | |
1734 | * This should be done on write(), truncate() and chown(). | |
a09f99ed | 1735 | */ |
5e940c1d MS |
1736 | if (!fc->handle_killpriv) { |
1737 | int kill; | |
1738 | ||
1739 | /* | |
1740 | * ia_mode calculation may have used stale i_mode. | |
1741 | * Refresh and recalculate. | |
1742 | */ | |
1743 | ret = fuse_do_getattr(inode, NULL, file); | |
1744 | if (ret) | |
1745 | return ret; | |
1746 | ||
1747 | attr->ia_mode = inode->i_mode; | |
1748 | kill = should_remove_suid(entry); | |
1749 | if (kill & ATTR_KILL_SUID) { | |
1750 | attr->ia_valid |= ATTR_MODE; | |
1751 | attr->ia_mode &= ~S_ISUID; | |
1752 | } | |
1753 | if (kill & ATTR_KILL_SGID) { | |
1754 | attr->ia_valid |= ATTR_MODE; | |
1755 | attr->ia_mode &= ~S_ISGID; | |
1756 | } | |
a09f99ed MS |
1757 | } |
1758 | } | |
1759 | if (!attr->ia_valid) | |
1760 | return 0; | |
5e2b8828 | 1761 | |
abb5a14f | 1762 | ret = fuse_do_setattr(entry, attr, file); |
5e2b8828 | 1763 | if (!ret) { |
60bcc88a SF |
1764 | /* |
1765 | * If filesystem supports acls it may have updated acl xattrs in | |
1766 | * the filesystem, so forget cached acls for the inode. | |
1767 | */ | |
1768 | if (fc->posix_acl) | |
1769 | forget_all_cached_acls(inode); | |
1770 | ||
5e2b8828 MS |
1771 | /* Directory mode changed, may need to revalidate access */ |
1772 | if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE)) | |
1773 | fuse_invalidate_entry_cache(entry); | |
1774 | } | |
1775 | return ret; | |
49d4914f MS |
1776 | } |
1777 | ||
e5e5558e MS |
1778 | static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry, |
1779 | struct kstat *stat) | |
1780 | { | |
2b0143b5 | 1781 | struct inode *inode = d_inode(entry); |
244f6385 | 1782 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1783 | |
c2132c1b | 1784 | if (!fuse_allow_current_process(fc)) |
244f6385 MS |
1785 | return -EACCES; |
1786 | ||
bcb4be80 | 1787 | return fuse_update_attributes(inode, stat, NULL, NULL); |
e5e5558e MS |
1788 | } |
1789 | ||
754661f1 | 1790 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1791 | .lookup = fuse_lookup, |
9e6268db MS |
1792 | .mkdir = fuse_mkdir, |
1793 | .symlink = fuse_symlink, | |
1794 | .unlink = fuse_unlink, | |
1795 | .rmdir = fuse_rmdir, | |
2773bf00 | 1796 | .rename = fuse_rename2, |
9e6268db MS |
1797 | .link = fuse_link, |
1798 | .setattr = fuse_setattr, | |
1799 | .create = fuse_create, | |
c8ccbe03 | 1800 | .atomic_open = fuse_atomic_open, |
9e6268db | 1801 | .mknod = fuse_mknod, |
e5e5558e MS |
1802 | .permission = fuse_permission, |
1803 | .getattr = fuse_getattr, | |
92a8780e | 1804 | .listxattr = fuse_listxattr, |
60bcc88a SF |
1805 | .get_acl = fuse_get_acl, |
1806 | .set_acl = fuse_set_acl, | |
e5e5558e MS |
1807 | }; |
1808 | ||
4b6f5d20 | 1809 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1810 | .llseek = generic_file_llseek, |
e5e5558e | 1811 | .read = generic_read_dir, |
d9b3dbdc | 1812 | .iterate_shared = fuse_readdir, |
e5e5558e MS |
1813 | .open = fuse_dir_open, |
1814 | .release = fuse_dir_release, | |
82547981 | 1815 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1816 | .unlocked_ioctl = fuse_dir_ioctl, |
1817 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1818 | }; |
1819 | ||
754661f1 | 1820 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1821 | .setattr = fuse_setattr, |
e5e5558e MS |
1822 | .permission = fuse_permission, |
1823 | .getattr = fuse_getattr, | |
92a8780e | 1824 | .listxattr = fuse_listxattr, |
60bcc88a SF |
1825 | .get_acl = fuse_get_acl, |
1826 | .set_acl = fuse_set_acl, | |
e5e5558e MS |
1827 | }; |
1828 | ||
754661f1 | 1829 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1830 | .setattr = fuse_setattr, |
6b255391 | 1831 | .get_link = fuse_get_link, |
e5e5558e MS |
1832 | .readlink = generic_readlink, |
1833 | .getattr = fuse_getattr, | |
92a8780e | 1834 | .listxattr = fuse_listxattr, |
e5e5558e MS |
1835 | }; |
1836 | ||
1837 | void fuse_init_common(struct inode *inode) | |
1838 | { | |
1839 | inode->i_op = &fuse_common_inode_operations; | |
1840 | } | |
1841 | ||
1842 | void fuse_init_dir(struct inode *inode) | |
1843 | { | |
1844 | inode->i_op = &fuse_dir_inode_operations; | |
1845 | inode->i_fop = &fuse_dir_operations; | |
1846 | } | |
1847 | ||
1848 | void fuse_init_symlink(struct inode *inode) | |
1849 | { | |
1850 | inode->i_op = &fuse_symlink_inode_operations; | |
1851 | } |