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> |
261aaba7 | 17 | #include <linux/iversion.h> |
60bcc88a | 18 | #include <linux/posix_acl.h> |
e5e5558e | 19 | |
4582a4ab FS |
20 | static void fuse_advise_use_readdirplus(struct inode *dir) |
21 | { | |
22 | struct fuse_inode *fi = get_fuse_inode(dir); | |
23 | ||
24 | set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state); | |
25 | } | |
26 | ||
30c6a23d KK |
27 | #if BITS_PER_LONG >= 64 |
28 | static inline void __fuse_dentry_settime(struct dentry *entry, u64 time) | |
29 | { | |
30 | entry->d_fsdata = (void *) time; | |
31 | } | |
32 | ||
33 | static inline u64 fuse_dentry_time(const struct dentry *entry) | |
34 | { | |
35 | return (u64)entry->d_fsdata; | |
36 | } | |
37 | ||
38 | #else | |
f75fdf22 MS |
39 | union fuse_dentry { |
40 | u64 time; | |
41 | struct rcu_head rcu; | |
42 | }; | |
43 | ||
30c6a23d KK |
44 | static inline void __fuse_dentry_settime(struct dentry *dentry, u64 time) |
45 | { | |
46 | ((union fuse_dentry *) dentry->d_fsdata)->time = time; | |
47 | } | |
48 | ||
49 | static inline u64 fuse_dentry_time(const struct dentry *entry) | |
50 | { | |
51 | return ((union fuse_dentry *) entry->d_fsdata)->time; | |
52 | } | |
53 | #endif | |
54 | ||
8fab0106 | 55 | static void fuse_dentry_settime(struct dentry *dentry, u64 time) |
0a0898cf | 56 | { |
8fab0106 MS |
57 | struct fuse_conn *fc = get_fuse_conn_super(dentry->d_sb); |
58 | bool delete = !time && fc->delete_stale; | |
59 | /* | |
60 | * Mess with DCACHE_OP_DELETE because dput() will be faster without it. | |
61 | * Don't care about races, either way it's just an optimization | |
62 | */ | |
63 | if ((!delete && (dentry->d_flags & DCACHE_OP_DELETE)) || | |
64 | (delete && !(dentry->d_flags & DCACHE_OP_DELETE))) { | |
65 | spin_lock(&dentry->d_lock); | |
66 | if (!delete) | |
67 | dentry->d_flags &= ~DCACHE_OP_DELETE; | |
68 | else | |
69 | dentry->d_flags |= DCACHE_OP_DELETE; | |
70 | spin_unlock(&dentry->d_lock); | |
71 | } | |
72 | ||
30c6a23d | 73 | __fuse_dentry_settime(dentry, time); |
0a0898cf | 74 | } |
0a0898cf | 75 | |
6f9f1180 MS |
76 | /* |
77 | * FUSE caches dentries and attributes with separate timeout. The | |
78 | * time in jiffies until the dentry/attributes are valid is stored in | |
f75fdf22 | 79 | * dentry->d_fsdata and fuse_inode->i_time respectively. |
6f9f1180 MS |
80 | */ |
81 | ||
82 | /* | |
83 | * Calculate the time in jiffies until a dentry/attributes are valid | |
84 | */ | |
bcb6f6d2 | 85 | static u64 time_to_jiffies(u64 sec, u32 nsec) |
e5e5558e | 86 | { |
685d16dd | 87 | if (sec || nsec) { |
bcb6f6d2 MS |
88 | struct timespec64 ts = { |
89 | sec, | |
21067527 | 90 | min_t(u32, nsec, NSEC_PER_SEC - 1) |
bcb6f6d2 MS |
91 | }; |
92 | ||
93 | return get_jiffies_64() + timespec64_to_jiffies(&ts); | |
685d16dd | 94 | } else |
0a0898cf | 95 | return 0; |
e5e5558e MS |
96 | } |
97 | ||
6f9f1180 MS |
98 | /* |
99 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
100 | * replies | |
101 | */ | |
d123d8e1 | 102 | void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o) |
0aa7c699 | 103 | { |
0a0898cf MS |
104 | fuse_dentry_settime(entry, |
105 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
1fb69e78 MS |
106 | } |
107 | ||
108 | static u64 attr_timeout(struct fuse_attr_out *o) | |
109 | { | |
110 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
111 | } | |
112 | ||
d123d8e1 | 113 | u64 entry_attr_timeout(struct fuse_entry_out *o) |
1fb69e78 MS |
114 | { |
115 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
8cbdf1e6 MS |
116 | } |
117 | ||
2f1e8196 MS |
118 | static void fuse_invalidate_attr_mask(struct inode *inode, u32 mask) |
119 | { | |
120 | set_mask_bits(&get_fuse_inode(inode)->inval_mask, 0, mask); | |
121 | } | |
122 | ||
6f9f1180 MS |
123 | /* |
124 | * Mark the attributes as stale, so that at the next call to | |
125 | * ->getattr() they will be fetched from userspace | |
126 | */ | |
8cbdf1e6 MS |
127 | void fuse_invalidate_attr(struct inode *inode) |
128 | { | |
2f1e8196 | 129 | fuse_invalidate_attr_mask(inode, STATX_BASIC_STATS); |
8cbdf1e6 MS |
130 | } |
131 | ||
261aaba7 MS |
132 | static void fuse_dir_changed(struct inode *dir) |
133 | { | |
134 | fuse_invalidate_attr(dir); | |
135 | inode_maybe_inc_iversion(dir, false); | |
136 | } | |
137 | ||
451418fc AG |
138 | /** |
139 | * Mark the attributes as stale due to an atime change. Avoid the invalidate if | |
140 | * atime is not used. | |
141 | */ | |
142 | void fuse_invalidate_atime(struct inode *inode) | |
143 | { | |
144 | if (!IS_RDONLY(inode)) | |
2f1e8196 | 145 | fuse_invalidate_attr_mask(inode, STATX_ATIME); |
451418fc AG |
146 | } |
147 | ||
6f9f1180 MS |
148 | /* |
149 | * Just mark the entry as stale, so that a next attempt to look it up | |
150 | * will result in a new lookup call to userspace | |
151 | * | |
152 | * This is called when a dentry is about to become negative and the | |
153 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
154 | * lookup) | |
155 | */ | |
dbd561d2 | 156 | void fuse_invalidate_entry_cache(struct dentry *entry) |
8cbdf1e6 | 157 | { |
0a0898cf | 158 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
159 | } |
160 | ||
6f9f1180 MS |
161 | /* |
162 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
163 | * dentry from the hash | |
164 | */ | |
8cbdf1e6 MS |
165 | static void fuse_invalidate_entry(struct dentry *entry) |
166 | { | |
167 | d_invalidate(entry); | |
168 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
169 | } |
170 | ||
7078187a | 171 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, |
13983d06 | 172 | u64 nodeid, const struct qstr *name, |
e5e5558e MS |
173 | struct fuse_entry_out *outarg) |
174 | { | |
0e9663ee | 175 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
d5b48543 MS |
176 | args->opcode = FUSE_LOOKUP; |
177 | args->nodeid = nodeid; | |
178 | args->in_numargs = 1; | |
179 | args->in_args[0].size = name->len + 1; | |
180 | args->in_args[0].value = name->name; | |
181 | args->out_numargs = 1; | |
182 | args->out_args[0].size = sizeof(struct fuse_entry_out); | |
183 | args->out_args[0].value = outarg; | |
e5e5558e MS |
184 | } |
185 | ||
6f9f1180 MS |
186 | /* |
187 | * Check whether the dentry is still valid | |
188 | * | |
189 | * If the entry validity timeout has expired and the dentry is | |
190 | * positive, try to redo the lookup. If the lookup results in a | |
191 | * different inode, then let the VFS invalidate the dentry and redo | |
192 | * the lookup once more. If the lookup results in the same inode, | |
193 | * then refresh the attributes, timeouts and mark the dentry valid. | |
194 | */ | |
0b728e19 | 195 | static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) |
e5e5558e | 196 | { |
34286d66 | 197 | struct inode *inode; |
28420dad MS |
198 | struct dentry *parent; |
199 | struct fuse_conn *fc; | |
6314efee | 200 | struct fuse_inode *fi; |
e2a6b952 | 201 | int ret; |
8cbdf1e6 | 202 | |
2b0143b5 | 203 | inode = d_inode_rcu(entry); |
8cbdf1e6 | 204 | if (inode && is_bad_inode(inode)) |
e2a6b952 | 205 | goto invalid; |
154210cc AA |
206 | else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) || |
207 | (flags & LOOKUP_REVAL)) { | |
e5e5558e | 208 | struct fuse_entry_out outarg; |
7078187a | 209 | FUSE_ARGS(args); |
07e77dca | 210 | struct fuse_forget_link *forget; |
1fb69e78 | 211 | u64 attr_version; |
8cbdf1e6 | 212 | |
50322fe7 | 213 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 | 214 | if (!inode) |
e2a6b952 | 215 | goto invalid; |
8cbdf1e6 | 216 | |
e2a6b952 | 217 | ret = -ECHILD; |
0b728e19 | 218 | if (flags & LOOKUP_RCU) |
e2a6b952 | 219 | goto out; |
e7c0a167 | 220 | |
8cbdf1e6 | 221 | fc = get_fuse_conn(inode); |
e5e5558e | 222 | |
07e77dca | 223 | forget = fuse_alloc_forget(); |
7078187a MS |
224 | ret = -ENOMEM; |
225 | if (!forget) | |
e2a6b952 | 226 | goto out; |
2d51013e | 227 | |
7dca9fd3 | 228 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 229 | |
e956edd0 | 230 | parent = dget_parent(entry); |
2b0143b5 | 231 | fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)), |
c180eebe | 232 | &entry->d_name, &outarg); |
7078187a | 233 | ret = fuse_simple_request(fc, &args); |
e956edd0 | 234 | dput(parent); |
50322fe7 | 235 | /* Zero nodeid is same as -ENOENT */ |
7078187a MS |
236 | if (!ret && !outarg.nodeid) |
237 | ret = -ENOENT; | |
238 | if (!ret) { | |
6314efee | 239 | fi = get_fuse_inode(inode); |
9e6268db | 240 | if (outarg.nodeid != get_node_id(inode)) { |
07e77dca | 241 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
e2a6b952 | 242 | goto invalid; |
9e6268db | 243 | } |
c9d8f5f0 | 244 | spin_lock(&fi->lock); |
1729a16c | 245 | fi->nlookup++; |
c9d8f5f0 | 246 | spin_unlock(&fi->lock); |
9e6268db | 247 | } |
07e77dca | 248 | kfree(forget); |
7078187a MS |
249 | if (ret == -ENOMEM) |
250 | goto out; | |
eb59bd17 MS |
251 | if (ret || fuse_invalid_attr(&outarg.attr) || |
252 | (outarg.attr.mode ^ inode->i_mode) & S_IFMT) | |
e2a6b952 | 253 | goto invalid; |
e5e5558e | 254 | |
60bcc88a | 255 | forget_all_cached_acls(inode); |
1fb69e78 MS |
256 | fuse_change_attributes(inode, &outarg.attr, |
257 | entry_attr_timeout(&outarg), | |
258 | attr_version); | |
259 | fuse_change_entry_timeout(entry, &outarg); | |
28420dad | 260 | } else if (inode) { |
6314efee MS |
261 | fi = get_fuse_inode(inode); |
262 | if (flags & LOOKUP_RCU) { | |
263 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) | |
264 | return -ECHILD; | |
265 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { | |
28420dad | 266 | parent = dget_parent(entry); |
2b0143b5 | 267 | fuse_advise_use_readdirplus(d_inode(parent)); |
28420dad MS |
268 | dput(parent); |
269 | } | |
e5e5558e | 270 | } |
e2a6b952 MS |
271 | ret = 1; |
272 | out: | |
273 | return ret; | |
274 | ||
275 | invalid: | |
276 | ret = 0; | |
277 | goto out; | |
e5e5558e MS |
278 | } |
279 | ||
30c6a23d | 280 | #if BITS_PER_LONG < 64 |
f75fdf22 MS |
281 | static int fuse_dentry_init(struct dentry *dentry) |
282 | { | |
dc69e98c KK |
283 | dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), |
284 | GFP_KERNEL_ACCOUNT | __GFP_RECLAIMABLE); | |
f75fdf22 MS |
285 | |
286 | return dentry->d_fsdata ? 0 : -ENOMEM; | |
287 | } | |
288 | static void fuse_dentry_release(struct dentry *dentry) | |
289 | { | |
290 | union fuse_dentry *fd = dentry->d_fsdata; | |
291 | ||
292 | kfree_rcu(fd, rcu); | |
293 | } | |
30c6a23d | 294 | #endif |
f75fdf22 | 295 | |
8fab0106 MS |
296 | static int fuse_dentry_delete(const struct dentry *dentry) |
297 | { | |
298 | return time_before64(fuse_dentry_time(dentry), get_jiffies_64()); | |
299 | } | |
300 | ||
4269590a | 301 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e | 302 | .d_revalidate = fuse_dentry_revalidate, |
8fab0106 | 303 | .d_delete = fuse_dentry_delete, |
30c6a23d | 304 | #if BITS_PER_LONG < 64 |
f75fdf22 MS |
305 | .d_init = fuse_dentry_init, |
306 | .d_release = fuse_dentry_release, | |
30c6a23d | 307 | #endif |
e5e5558e MS |
308 | }; |
309 | ||
0ce267ff | 310 | const struct dentry_operations fuse_root_dentry_operations = { |
30c6a23d | 311 | #if BITS_PER_LONG < 64 |
0ce267ff MS |
312 | .d_init = fuse_dentry_init, |
313 | .d_release = fuse_dentry_release, | |
30c6a23d | 314 | #endif |
0ce267ff MS |
315 | }; |
316 | ||
a5bfffac | 317 | int fuse_valid_type(int m) |
39ee059a MS |
318 | { |
319 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
320 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
321 | } | |
322 | ||
eb59bd17 MS |
323 | bool fuse_invalid_attr(struct fuse_attr *attr) |
324 | { | |
325 | return !fuse_valid_type(attr->mode) || | |
326 | attr->size > LLONG_MAX; | |
327 | } | |
328 | ||
13983d06 | 329 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name, |
c180eebe | 330 | struct fuse_entry_out *outarg, struct inode **inode) |
e5e5558e | 331 | { |
c180eebe | 332 | struct fuse_conn *fc = get_fuse_conn_super(sb); |
7078187a | 333 | FUSE_ARGS(args); |
07e77dca | 334 | struct fuse_forget_link *forget; |
1fb69e78 | 335 | u64 attr_version; |
c180eebe | 336 | int err; |
e5e5558e | 337 | |
c180eebe MS |
338 | *inode = NULL; |
339 | err = -ENAMETOOLONG; | |
340 | if (name->len > FUSE_NAME_MAX) | |
341 | goto out; | |
e5e5558e | 342 | |
e5e5558e | 343 | |
07e77dca MS |
344 | forget = fuse_alloc_forget(); |
345 | err = -ENOMEM; | |
7078187a | 346 | if (!forget) |
c180eebe | 347 | goto out; |
2d51013e | 348 | |
7dca9fd3 | 349 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 350 | |
7078187a MS |
351 | fuse_lookup_init(fc, &args, nodeid, name, outarg); |
352 | err = fuse_simple_request(fc, &args); | |
50322fe7 | 353 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
354 | if (err || !outarg->nodeid) |
355 | goto out_put_forget; | |
356 | ||
357 | err = -EIO; | |
358 | if (!outarg->nodeid) | |
359 | goto out_put_forget; | |
eb59bd17 | 360 | if (fuse_invalid_attr(&outarg->attr)) |
c180eebe MS |
361 | goto out_put_forget; |
362 | ||
363 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
364 | &outarg->attr, entry_attr_timeout(outarg), | |
365 | attr_version); | |
366 | err = -ENOMEM; | |
367 | if (!*inode) { | |
07e77dca | 368 | fuse_queue_forget(fc, forget, outarg->nodeid, 1); |
c180eebe | 369 | goto out; |
e5e5558e | 370 | } |
c180eebe MS |
371 | err = 0; |
372 | ||
373 | out_put_forget: | |
07e77dca | 374 | kfree(forget); |
c180eebe MS |
375 | out: |
376 | return err; | |
377 | } | |
378 | ||
379 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 380 | unsigned int flags) |
c180eebe MS |
381 | { |
382 | int err; | |
383 | struct fuse_entry_out outarg; | |
384 | struct inode *inode; | |
385 | struct dentry *newent; | |
c180eebe | 386 | bool outarg_valid = true; |
63576c13 | 387 | bool locked; |
c180eebe | 388 | |
63576c13 | 389 | locked = fuse_lock_inode(dir); |
c180eebe MS |
390 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, |
391 | &outarg, &inode); | |
63576c13 | 392 | fuse_unlock_inode(dir, locked); |
c180eebe MS |
393 | if (err == -ENOENT) { |
394 | outarg_valid = false; | |
395 | err = 0; | |
396 | } | |
397 | if (err) | |
398 | goto out_err; | |
399 | ||
400 | err = -EIO; | |
401 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
402 | goto out_iput; | |
e5e5558e | 403 | |
41d28bca | 404 | newent = d_splice_alias(inode, entry); |
5835f339 MS |
405 | err = PTR_ERR(newent); |
406 | if (IS_ERR(newent)) | |
407 | goto out_err; | |
d2a85164 | 408 | |
0de6256d | 409 | entry = newent ? newent : entry; |
c180eebe | 410 | if (outarg_valid) |
1fb69e78 | 411 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
412 | else |
413 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 414 | |
6c26f717 MS |
415 | if (inode) |
416 | fuse_advise_use_readdirplus(dir); | |
0de6256d | 417 | return newent; |
c180eebe MS |
418 | |
419 | out_iput: | |
420 | iput(inode); | |
421 | out_err: | |
422 | return ERR_PTR(err); | |
e5e5558e MS |
423 | } |
424 | ||
6f9f1180 MS |
425 | /* |
426 | * Atomic create+open operation | |
427 | * | |
428 | * If the filesystem doesn't support this, then fall back to separate | |
429 | * 'mknod' + 'open' requests. | |
430 | */ | |
d9585277 | 431 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 432 | struct file *file, unsigned flags, |
b452a458 | 433 | umode_t mode) |
fd72faac MS |
434 | { |
435 | int err; | |
436 | struct inode *inode; | |
437 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 438 | FUSE_ARGS(args); |
07e77dca | 439 | struct fuse_forget_link *forget; |
e0a43ddc | 440 | struct fuse_create_in inarg; |
fd72faac MS |
441 | struct fuse_open_out outopen; |
442 | struct fuse_entry_out outentry; | |
ebf84d0c | 443 | struct fuse_inode *fi; |
fd72faac | 444 | struct fuse_file *ff; |
fd72faac | 445 | |
af109bca MS |
446 | /* Userspace expects S_IFREG in create mode */ |
447 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
448 | ||
07e77dca | 449 | forget = fuse_alloc_forget(); |
c8ccbe03 | 450 | err = -ENOMEM; |
07e77dca | 451 | if (!forget) |
c8ccbe03 | 452 | goto out_err; |
51eb01e7 | 453 | |
ce1d5a49 | 454 | err = -ENOMEM; |
acf99433 | 455 | ff = fuse_file_alloc(fc); |
fd72faac | 456 | if (!ff) |
7078187a | 457 | goto out_put_forget_req; |
fd72faac | 458 | |
e0a43ddc MS |
459 | if (!fc->dont_mask) |
460 | mode &= ~current_umask(); | |
461 | ||
fd72faac MS |
462 | flags &= ~O_NOCTTY; |
463 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 464 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
465 | inarg.flags = flags; |
466 | inarg.mode = mode; | |
e0a43ddc | 467 | inarg.umask = current_umask(); |
d5b48543 MS |
468 | args.opcode = FUSE_CREATE; |
469 | args.nodeid = get_node_id(dir); | |
470 | args.in_numargs = 2; | |
471 | args.in_args[0].size = sizeof(inarg); | |
472 | args.in_args[0].value = &inarg; | |
473 | args.in_args[1].size = entry->d_name.len + 1; | |
474 | args.in_args[1].value = entry->d_name.name; | |
475 | args.out_numargs = 2; | |
476 | args.out_args[0].size = sizeof(outentry); | |
477 | args.out_args[0].value = &outentry; | |
478 | args.out_args[1].size = sizeof(outopen); | |
479 | args.out_args[1].value = &outopen; | |
7078187a | 480 | err = fuse_simple_request(fc, &args); |
c8ccbe03 | 481 | if (err) |
fd72faac | 482 | goto out_free_ff; |
fd72faac MS |
483 | |
484 | err = -EIO; | |
eb59bd17 MS |
485 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid) || |
486 | fuse_invalid_attr(&outentry.attr)) | |
fd72faac MS |
487 | goto out_free_ff; |
488 | ||
c7b7143c MS |
489 | ff->fh = outopen.fh; |
490 | ff->nodeid = outentry.nodeid; | |
491 | ff->open_flags = outopen.open_flags; | |
fd72faac | 492 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 493 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
494 | if (!inode) { |
495 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
ebf84d0c | 496 | fuse_sync_release(NULL, ff, flags); |
07e77dca | 497 | fuse_queue_forget(fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
498 | err = -ENOMEM; |
499 | goto out_err; | |
fd72faac | 500 | } |
07e77dca | 501 | kfree(forget); |
fd72faac | 502 | d_instantiate(entry, inode); |
1fb69e78 | 503 | fuse_change_entry_timeout(entry, &outentry); |
261aaba7 | 504 | fuse_dir_changed(dir); |
be12af3e | 505 | err = finish_open(file, entry, generic_file_open); |
30d90494 | 506 | if (err) { |
ebf84d0c KT |
507 | fi = get_fuse_inode(inode); |
508 | fuse_sync_release(fi, ff, flags); | |
c8ccbe03 | 509 | } else { |
267d8444 | 510 | file->private_data = ff; |
c8ccbe03 | 511 | fuse_finish_open(inode, file); |
fd72faac | 512 | } |
d9585277 | 513 | return err; |
fd72faac | 514 | |
c8ccbe03 | 515 | out_free_ff: |
fd72faac | 516 | fuse_file_free(ff); |
c8ccbe03 | 517 | out_put_forget_req: |
07e77dca | 518 | kfree(forget); |
c8ccbe03 | 519 | out_err: |
d9585277 | 520 | return err; |
c8ccbe03 MS |
521 | } |
522 | ||
523 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 524 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 525 | struct file *file, unsigned flags, |
44907d79 | 526 | umode_t mode) |
c8ccbe03 MS |
527 | { |
528 | int err; | |
529 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
530 | struct dentry *res = NULL; |
531 | ||
00699ad8 | 532 | if (d_in_lookup(entry)) { |
00cd8dd3 | 533 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 534 | if (IS_ERR(res)) |
d9585277 | 535 | return PTR_ERR(res); |
c8ccbe03 MS |
536 | |
537 | if (res) | |
538 | entry = res; | |
539 | } | |
540 | ||
2b0143b5 | 541 | if (!(flags & O_CREAT) || d_really_is_positive(entry)) |
c8ccbe03 MS |
542 | goto no_open; |
543 | ||
544 | /* Only creates */ | |
73a09dd9 | 545 | file->f_mode |= FMODE_CREATED; |
c8ccbe03 MS |
546 | |
547 | if (fc->no_create) | |
548 | goto mknod; | |
549 | ||
b452a458 | 550 | err = fuse_create_open(dir, entry, file, flags, mode); |
d9585277 | 551 | if (err == -ENOSYS) { |
c8ccbe03 MS |
552 | fc->no_create = 1; |
553 | goto mknod; | |
554 | } | |
555 | out_dput: | |
556 | dput(res); | |
d9585277 | 557 | return err; |
c8ccbe03 MS |
558 | |
559 | mknod: | |
560 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 561 | if (err) |
c8ccbe03 | 562 | goto out_dput; |
c8ccbe03 | 563 | no_open: |
e45198a6 | 564 | return finish_no_open(file, res); |
fd72faac MS |
565 | } |
566 | ||
6f9f1180 MS |
567 | /* |
568 | * Code shared between mknod, mkdir, symlink and link | |
569 | */ | |
7078187a | 570 | static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args, |
9e6268db | 571 | struct inode *dir, struct dentry *entry, |
541af6a0 | 572 | umode_t mode) |
9e6268db MS |
573 | { |
574 | struct fuse_entry_out outarg; | |
575 | struct inode *inode; | |
c971e6a0 | 576 | struct dentry *d; |
9e6268db | 577 | int err; |
07e77dca | 578 | struct fuse_forget_link *forget; |
2d51013e | 579 | |
07e77dca | 580 | forget = fuse_alloc_forget(); |
7078187a | 581 | if (!forget) |
07e77dca | 582 | return -ENOMEM; |
9e6268db | 583 | |
0e9663ee | 584 | memset(&outarg, 0, sizeof(outarg)); |
d5b48543 MS |
585 | args->nodeid = get_node_id(dir); |
586 | args->out_numargs = 1; | |
587 | args->out_args[0].size = sizeof(outarg); | |
588 | args->out_args[0].value = &outarg; | |
7078187a | 589 | err = fuse_simple_request(fc, args); |
2d51013e MS |
590 | if (err) |
591 | goto out_put_forget_req; | |
592 | ||
39ee059a | 593 | err = -EIO; |
eb59bd17 | 594 | if (invalid_nodeid(outarg.nodeid) || fuse_invalid_attr(&outarg.attr)) |
2d51013e | 595 | goto out_put_forget_req; |
39ee059a MS |
596 | |
597 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 598 | goto out_put_forget_req; |
39ee059a | 599 | |
9e6268db | 600 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 601 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 602 | if (!inode) { |
07e77dca | 603 | fuse_queue_forget(fc, forget, outarg.nodeid, 1); |
9e6268db MS |
604 | return -ENOMEM; |
605 | } | |
07e77dca | 606 | kfree(forget); |
9e6268db | 607 | |
c971e6a0 AV |
608 | d_drop(entry); |
609 | d = d_splice_alias(inode, entry); | |
610 | if (IS_ERR(d)) | |
611 | return PTR_ERR(d); | |
9e6268db | 612 | |
c971e6a0 AV |
613 | if (d) { |
614 | fuse_change_entry_timeout(d, &outarg); | |
615 | dput(d); | |
616 | } else { | |
617 | fuse_change_entry_timeout(entry, &outarg); | |
618 | } | |
261aaba7 | 619 | fuse_dir_changed(dir); |
9e6268db | 620 | return 0; |
39ee059a | 621 | |
2d51013e | 622 | out_put_forget_req: |
07e77dca | 623 | kfree(forget); |
39ee059a | 624 | return err; |
9e6268db MS |
625 | } |
626 | ||
1a67aafb | 627 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
628 | dev_t rdev) |
629 | { | |
630 | struct fuse_mknod_in inarg; | |
631 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 632 | FUSE_ARGS(args); |
9e6268db | 633 | |
e0a43ddc MS |
634 | if (!fc->dont_mask) |
635 | mode &= ~current_umask(); | |
636 | ||
9e6268db MS |
637 | memset(&inarg, 0, sizeof(inarg)); |
638 | inarg.mode = mode; | |
639 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 640 | inarg.umask = current_umask(); |
d5b48543 MS |
641 | args.opcode = FUSE_MKNOD; |
642 | args.in_numargs = 2; | |
643 | args.in_args[0].size = sizeof(inarg); | |
644 | args.in_args[0].value = &inarg; | |
645 | args.in_args[1].size = entry->d_name.len + 1; | |
646 | args.in_args[1].value = entry->d_name.name; | |
7078187a | 647 | return create_new_entry(fc, &args, dir, entry, mode); |
9e6268db MS |
648 | } |
649 | ||
4acdaf27 | 650 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
ebfc3b49 | 651 | bool excl) |
9e6268db MS |
652 | { |
653 | return fuse_mknod(dir, entry, mode, 0); | |
654 | } | |
655 | ||
18bb1db3 | 656 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
657 | { |
658 | struct fuse_mkdir_in inarg; | |
659 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a | 660 | FUSE_ARGS(args); |
9e6268db | 661 | |
e0a43ddc MS |
662 | if (!fc->dont_mask) |
663 | mode &= ~current_umask(); | |
664 | ||
9e6268db MS |
665 | memset(&inarg, 0, sizeof(inarg)); |
666 | inarg.mode = mode; | |
e0a43ddc | 667 | inarg.umask = current_umask(); |
d5b48543 MS |
668 | args.opcode = FUSE_MKDIR; |
669 | args.in_numargs = 2; | |
670 | args.in_args[0].size = sizeof(inarg); | |
671 | args.in_args[0].value = &inarg; | |
672 | args.in_args[1].size = entry->d_name.len + 1; | |
673 | args.in_args[1].value = entry->d_name.name; | |
7078187a | 674 | return create_new_entry(fc, &args, dir, entry, S_IFDIR); |
9e6268db MS |
675 | } |
676 | ||
677 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
678 | const char *link) | |
679 | { | |
680 | struct fuse_conn *fc = get_fuse_conn(dir); | |
681 | unsigned len = strlen(link) + 1; | |
7078187a | 682 | FUSE_ARGS(args); |
9e6268db | 683 | |
d5b48543 MS |
684 | args.opcode = FUSE_SYMLINK; |
685 | args.in_numargs = 2; | |
686 | args.in_args[0].size = entry->d_name.len + 1; | |
687 | args.in_args[0].value = entry->d_name.name; | |
688 | args.in_args[1].size = len; | |
689 | args.in_args[1].value = link; | |
7078187a | 690 | return create_new_entry(fc, &args, dir, entry, S_IFLNK); |
9e6268db MS |
691 | } |
692 | ||
703c7362 | 693 | void fuse_update_ctime(struct inode *inode) |
31f3267b MP |
694 | { |
695 | if (!IS_NOCMTIME(inode)) { | |
c2050a45 | 696 | inode->i_ctime = current_time(inode); |
31f3267b MP |
697 | mark_inode_dirty_sync(inode); |
698 | } | |
699 | } | |
700 | ||
9e6268db MS |
701 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
702 | { | |
703 | int err; | |
704 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a MS |
705 | FUSE_ARGS(args); |
706 | ||
d5b48543 MS |
707 | args.opcode = FUSE_UNLINK; |
708 | args.nodeid = get_node_id(dir); | |
709 | args.in_numargs = 1; | |
710 | args.in_args[0].size = entry->d_name.len + 1; | |
711 | args.in_args[0].value = entry->d_name.name; | |
7078187a | 712 | err = fuse_simple_request(fc, &args); |
9e6268db | 713 | if (!err) { |
2b0143b5 | 714 | struct inode *inode = d_inode(entry); |
ac45d613 | 715 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 716 | |
f15ecfef | 717 | spin_lock(&fi->lock); |
4510d86f | 718 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
dfca7ceb MS |
719 | /* |
720 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
721 | * happen if userspace filesystem is careless. It would be | |
722 | * difficult to enforce correct nlink usage so just ignore this | |
723 | * condition here | |
724 | */ | |
725 | if (inode->i_nlink > 0) | |
726 | drop_nlink(inode); | |
f15ecfef | 727 | spin_unlock(&fi->lock); |
9e6268db | 728 | fuse_invalidate_attr(inode); |
261aaba7 | 729 | fuse_dir_changed(dir); |
8cbdf1e6 | 730 | fuse_invalidate_entry_cache(entry); |
31f3267b | 731 | fuse_update_ctime(inode); |
9e6268db MS |
732 | } else if (err == -EINTR) |
733 | fuse_invalidate_entry(entry); | |
734 | return err; | |
735 | } | |
736 | ||
737 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
738 | { | |
739 | int err; | |
740 | struct fuse_conn *fc = get_fuse_conn(dir); | |
7078187a MS |
741 | FUSE_ARGS(args); |
742 | ||
d5b48543 MS |
743 | args.opcode = FUSE_RMDIR; |
744 | args.nodeid = get_node_id(dir); | |
745 | args.in_numargs = 1; | |
746 | args.in_args[0].size = entry->d_name.len + 1; | |
747 | args.in_args[0].value = entry->d_name.name; | |
7078187a | 748 | err = fuse_simple_request(fc, &args); |
9e6268db | 749 | if (!err) { |
2b0143b5 | 750 | clear_nlink(d_inode(entry)); |
261aaba7 | 751 | fuse_dir_changed(dir); |
8cbdf1e6 | 752 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
753 | } else if (err == -EINTR) |
754 | fuse_invalidate_entry(entry); | |
755 | return err; | |
756 | } | |
757 | ||
1560c974 MS |
758 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
759 | struct inode *newdir, struct dentry *newent, | |
760 | unsigned int flags, int opcode, size_t argsize) | |
9e6268db MS |
761 | { |
762 | int err; | |
1560c974 | 763 | struct fuse_rename2_in inarg; |
9e6268db | 764 | struct fuse_conn *fc = get_fuse_conn(olddir); |
7078187a | 765 | FUSE_ARGS(args); |
9e6268db | 766 | |
1560c974 | 767 | memset(&inarg, 0, argsize); |
9e6268db | 768 | inarg.newdir = get_node_id(newdir); |
1560c974 | 769 | inarg.flags = flags; |
d5b48543 MS |
770 | args.opcode = opcode; |
771 | args.nodeid = get_node_id(olddir); | |
772 | args.in_numargs = 3; | |
773 | args.in_args[0].size = argsize; | |
774 | args.in_args[0].value = &inarg; | |
775 | args.in_args[1].size = oldent->d_name.len + 1; | |
776 | args.in_args[1].value = oldent->d_name.name; | |
777 | args.in_args[2].size = newent->d_name.len + 1; | |
778 | args.in_args[2].value = newent->d_name.name; | |
7078187a | 779 | err = fuse_simple_request(fc, &args); |
9e6268db | 780 | if (!err) { |
08b63307 | 781 | /* ctime changes */ |
2b0143b5 DH |
782 | fuse_invalidate_attr(d_inode(oldent)); |
783 | fuse_update_ctime(d_inode(oldent)); | |
08b63307 | 784 | |
1560c974 | 785 | if (flags & RENAME_EXCHANGE) { |
2b0143b5 DH |
786 | fuse_invalidate_attr(d_inode(newent)); |
787 | fuse_update_ctime(d_inode(newent)); | |
1560c974 MS |
788 | } |
789 | ||
261aaba7 | 790 | fuse_dir_changed(olddir); |
9e6268db | 791 | if (olddir != newdir) |
261aaba7 | 792 | fuse_dir_changed(newdir); |
8cbdf1e6 MS |
793 | |
794 | /* newent will end up negative */ | |
2b0143b5 DH |
795 | if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) { |
796 | fuse_invalidate_attr(d_inode(newent)); | |
8cbdf1e6 | 797 | fuse_invalidate_entry_cache(newent); |
2b0143b5 | 798 | fuse_update_ctime(d_inode(newent)); |
5219f346 | 799 | } |
9e6268db MS |
800 | } else if (err == -EINTR) { |
801 | /* If request was interrupted, DEITY only knows if the | |
802 | rename actually took place. If the invalidation | |
803 | fails (e.g. some process has CWD under the renamed | |
804 | directory), then there can be inconsistency between | |
805 | the dcache and the real filesystem. Tough luck. */ | |
806 | fuse_invalidate_entry(oldent); | |
2b0143b5 | 807 | if (d_really_is_positive(newent)) |
9e6268db MS |
808 | fuse_invalidate_entry(newent); |
809 | } | |
810 | ||
811 | return err; | |
812 | } | |
813 | ||
1560c974 MS |
814 | static int fuse_rename2(struct inode *olddir, struct dentry *oldent, |
815 | struct inode *newdir, struct dentry *newent, | |
816 | unsigned int flags) | |
817 | { | |
818 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
819 | int err; | |
820 | ||
519525fa | 821 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
1560c974 MS |
822 | return -EINVAL; |
823 | ||
4237ba43 MS |
824 | if (flags) { |
825 | if (fc->no_rename2 || fc->minor < 23) | |
826 | return -EINVAL; | |
1560c974 | 827 | |
4237ba43 MS |
828 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, |
829 | FUSE_RENAME2, | |
830 | sizeof(struct fuse_rename2_in)); | |
831 | if (err == -ENOSYS) { | |
832 | fc->no_rename2 = 1; | |
833 | err = -EINVAL; | |
834 | } | |
835 | } else { | |
836 | err = fuse_rename_common(olddir, oldent, newdir, newent, 0, | |
837 | FUSE_RENAME, | |
838 | sizeof(struct fuse_rename_in)); | |
1560c974 | 839 | } |
4237ba43 | 840 | |
1560c974 | 841 | return err; |
4237ba43 | 842 | } |
1560c974 | 843 | |
9e6268db MS |
844 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
845 | struct dentry *newent) | |
846 | { | |
847 | int err; | |
848 | struct fuse_link_in inarg; | |
2b0143b5 | 849 | struct inode *inode = d_inode(entry); |
9e6268db | 850 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 851 | FUSE_ARGS(args); |
9e6268db MS |
852 | |
853 | memset(&inarg, 0, sizeof(inarg)); | |
854 | inarg.oldnodeid = get_node_id(inode); | |
d5b48543 MS |
855 | args.opcode = FUSE_LINK; |
856 | args.in_numargs = 2; | |
857 | args.in_args[0].size = sizeof(inarg); | |
858 | args.in_args[0].value = &inarg; | |
859 | args.in_args[1].size = newent->d_name.len + 1; | |
860 | args.in_args[1].value = newent->d_name.name; | |
7078187a | 861 | err = create_new_entry(fc, &args, newdir, newent, inode->i_mode); |
9e6268db MS |
862 | /* Contrary to "normal" filesystems it can happen that link |
863 | makes two "logical" inodes point to the same "physical" | |
864 | inode. We invalidate the attributes of the old one, so it | |
865 | will reflect changes in the backing inode (link count, | |
866 | etc.) | |
867 | */ | |
ac45d613 MS |
868 | if (!err) { |
869 | struct fuse_inode *fi = get_fuse_inode(inode); | |
870 | ||
f15ecfef | 871 | spin_lock(&fi->lock); |
4510d86f | 872 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
c634da71 MS |
873 | if (likely(inode->i_nlink < UINT_MAX)) |
874 | inc_nlink(inode); | |
f15ecfef | 875 | spin_unlock(&fi->lock); |
9e6268db | 876 | fuse_invalidate_attr(inode); |
31f3267b | 877 | fuse_update_ctime(inode); |
ac45d613 MS |
878 | } else if (err == -EINTR) { |
879 | fuse_invalidate_attr(inode); | |
880 | } | |
9e6268db MS |
881 | return err; |
882 | } | |
883 | ||
1fb69e78 MS |
884 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
885 | struct kstat *stat) | |
886 | { | |
203627bb | 887 | unsigned int blkbits; |
8373200b PE |
888 | struct fuse_conn *fc = get_fuse_conn(inode); |
889 | ||
890 | /* see the comment in fuse_change_attributes() */ | |
b0aa7606 | 891 | if (fc->writeback_cache && S_ISREG(inode->i_mode)) { |
8373200b | 892 | attr->size = i_size_read(inode); |
b0aa7606 MP |
893 | attr->mtime = inode->i_mtime.tv_sec; |
894 | attr->mtimensec = inode->i_mtime.tv_nsec; | |
31f3267b MP |
895 | attr->ctime = inode->i_ctime.tv_sec; |
896 | attr->ctimensec = inode->i_ctime.tv_nsec; | |
b0aa7606 | 897 | } |
203627bb | 898 | |
1fb69e78 MS |
899 | stat->dev = inode->i_sb->s_dev; |
900 | stat->ino = attr->ino; | |
901 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
902 | stat->nlink = attr->nlink; | |
8cb08329 EB |
903 | stat->uid = make_kuid(fc->user_ns, attr->uid); |
904 | stat->gid = make_kgid(fc->user_ns, attr->gid); | |
1fb69e78 MS |
905 | stat->rdev = inode->i_rdev; |
906 | stat->atime.tv_sec = attr->atime; | |
907 | stat->atime.tv_nsec = attr->atimensec; | |
908 | stat->mtime.tv_sec = attr->mtime; | |
909 | stat->mtime.tv_nsec = attr->mtimensec; | |
910 | stat->ctime.tv_sec = attr->ctime; | |
911 | stat->ctime.tv_nsec = attr->ctimensec; | |
912 | stat->size = attr->size; | |
913 | stat->blocks = attr->blocks; | |
203627bb MS |
914 | |
915 | if (attr->blksize != 0) | |
916 | blkbits = ilog2(attr->blksize); | |
917 | else | |
918 | blkbits = inode->i_sb->s_blocksize_bits; | |
919 | ||
920 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
921 | } |
922 | ||
c79e322f MS |
923 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
924 | struct file *file) | |
e5e5558e MS |
925 | { |
926 | int err; | |
c79e322f MS |
927 | struct fuse_getattr_in inarg; |
928 | struct fuse_attr_out outarg; | |
e5e5558e | 929 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 930 | FUSE_ARGS(args); |
1fb69e78 MS |
931 | u64 attr_version; |
932 | ||
7dca9fd3 | 933 | attr_version = fuse_get_attr_version(fc); |
1fb69e78 | 934 | |
c79e322f | 935 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 936 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
937 | /* Directories have separate file-handle space */ |
938 | if (file && S_ISREG(inode->i_mode)) { | |
939 | struct fuse_file *ff = file->private_data; | |
940 | ||
941 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
942 | inarg.fh = ff->fh; | |
943 | } | |
d5b48543 MS |
944 | args.opcode = FUSE_GETATTR; |
945 | args.nodeid = get_node_id(inode); | |
946 | args.in_numargs = 1; | |
947 | args.in_args[0].size = sizeof(inarg); | |
948 | args.in_args[0].value = &inarg; | |
949 | args.out_numargs = 1; | |
950 | args.out_args[0].size = sizeof(outarg); | |
951 | args.out_args[0].value = &outarg; | |
7078187a | 952 | err = fuse_simple_request(fc, &args); |
e5e5558e | 953 | if (!err) { |
eb59bd17 MS |
954 | if (fuse_invalid_attr(&outarg.attr) || |
955 | (inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
e5e5558e MS |
956 | make_bad_inode(inode); |
957 | err = -EIO; | |
958 | } else { | |
c79e322f MS |
959 | fuse_change_attributes(inode, &outarg.attr, |
960 | attr_timeout(&outarg), | |
1fb69e78 MS |
961 | attr_version); |
962 | if (stat) | |
c79e322f | 963 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
964 | } |
965 | } | |
966 | return err; | |
967 | } | |
968 | ||
5b97eeac | 969 | static int fuse_update_get_attr(struct inode *inode, struct file *file, |
2f1e8196 MS |
970 | struct kstat *stat, u32 request_mask, |
971 | unsigned int flags) | |
bcb4be80 MS |
972 | { |
973 | struct fuse_inode *fi = get_fuse_inode(inode); | |
5b97eeac | 974 | int err = 0; |
bf5c1898 | 975 | bool sync; |
bcb4be80 | 976 | |
bf5c1898 MS |
977 | if (flags & AT_STATX_FORCE_SYNC) |
978 | sync = true; | |
979 | else if (flags & AT_STATX_DONT_SYNC) | |
980 | sync = false; | |
2f1e8196 MS |
981 | else if (request_mask & READ_ONCE(fi->inval_mask)) |
982 | sync = true; | |
bf5c1898 MS |
983 | else |
984 | sync = time_before64(fi->i_time, get_jiffies_64()); | |
985 | ||
986 | if (sync) { | |
60bcc88a | 987 | forget_all_cached_acls(inode); |
bcb4be80 | 988 | err = fuse_do_getattr(inode, stat, file); |
5b97eeac MS |
989 | } else if (stat) { |
990 | generic_fillattr(inode, stat); | |
991 | stat->mode = fi->orig_i_mode; | |
992 | stat->ino = fi->orig_ino; | |
bcb4be80 MS |
993 | } |
994 | ||
bcb4be80 MS |
995 | return err; |
996 | } | |
997 | ||
5b97eeac MS |
998 | int fuse_update_attributes(struct inode *inode, struct file *file) |
999 | { | |
802dc049 MS |
1000 | /* Do *not* need to get atime for internal purposes */ |
1001 | return fuse_update_get_attr(inode, file, NULL, | |
1002 | STATX_BASIC_STATS & ~STATX_ATIME, 0); | |
5b97eeac MS |
1003 | } |
1004 | ||
3b463ae0 | 1005 | int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, |
451d0f59 | 1006 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
1007 | { |
1008 | int err = -ENOTDIR; | |
1009 | struct inode *parent; | |
1010 | struct dentry *dir; | |
1011 | struct dentry *entry; | |
1012 | ||
1013 | parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid); | |
1014 | if (!parent) | |
1015 | return -ENOENT; | |
1016 | ||
5955102c | 1017 | inode_lock(parent); |
3b463ae0 JM |
1018 | if (!S_ISDIR(parent->i_mode)) |
1019 | goto unlock; | |
1020 | ||
1021 | err = -ENOENT; | |
1022 | dir = d_find_alias(parent); | |
1023 | if (!dir) | |
1024 | goto unlock; | |
1025 | ||
8387ff25 | 1026 | name->hash = full_name_hash(dir, name->name, name->len); |
3b463ae0 JM |
1027 | entry = d_lookup(dir, name); |
1028 | dput(dir); | |
1029 | if (!entry) | |
1030 | goto unlock; | |
1031 | ||
261aaba7 | 1032 | fuse_dir_changed(parent); |
3b463ae0 | 1033 | fuse_invalidate_entry(entry); |
451d0f59 | 1034 | |
2b0143b5 | 1035 | if (child_nodeid != 0 && d_really_is_positive(entry)) { |
5955102c | 1036 | inode_lock(d_inode(entry)); |
2b0143b5 | 1037 | if (get_node_id(d_inode(entry)) != child_nodeid) { |
451d0f59 JM |
1038 | err = -ENOENT; |
1039 | goto badentry; | |
1040 | } | |
1041 | if (d_mountpoint(entry)) { | |
1042 | err = -EBUSY; | |
1043 | goto badentry; | |
1044 | } | |
e36cb0b8 | 1045 | if (d_is_dir(entry)) { |
451d0f59 JM |
1046 | shrink_dcache_parent(entry); |
1047 | if (!simple_empty(entry)) { | |
1048 | err = -ENOTEMPTY; | |
1049 | goto badentry; | |
1050 | } | |
2b0143b5 | 1051 | d_inode(entry)->i_flags |= S_DEAD; |
451d0f59 JM |
1052 | } |
1053 | dont_mount(entry); | |
2b0143b5 | 1054 | clear_nlink(d_inode(entry)); |
451d0f59 JM |
1055 | err = 0; |
1056 | badentry: | |
5955102c | 1057 | inode_unlock(d_inode(entry)); |
451d0f59 JM |
1058 | if (!err) |
1059 | d_delete(entry); | |
1060 | } else { | |
1061 | err = 0; | |
1062 | } | |
3b463ae0 | 1063 | dput(entry); |
3b463ae0 JM |
1064 | |
1065 | unlock: | |
5955102c | 1066 | inode_unlock(parent); |
3b463ae0 JM |
1067 | iput(parent); |
1068 | return err; | |
1069 | } | |
1070 | ||
87729a55 MS |
1071 | /* |
1072 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1073 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1074 | * means, that the filesystem daemon is able to record the exact |
1075 | * filesystem operations performed, and can also control the behavior | |
1076 | * of the requester process in otherwise impossible ways. For example | |
1077 | * it can delay the operation for arbitrary length of time allowing | |
1078 | * DoS against the requester. | |
1079 | * | |
1080 | * For this reason only those processes can call into the filesystem, | |
1081 | * for which the owner of the mount has ptrace privilege. This | |
1082 | * excludes processes started by other users, suid or sgid processes. | |
1083 | */ | |
c2132c1b | 1084 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1085 | { |
c69e8d9c | 1086 | const struct cred *cred; |
87729a55 | 1087 | |
29433a29 | 1088 | if (fc->allow_other) |
73f03c2b | 1089 | return current_in_userns(fc->user_ns); |
87729a55 | 1090 | |
c2132c1b | 1091 | cred = current_cred(); |
499dcf20 EB |
1092 | if (uid_eq(cred->euid, fc->user_id) && |
1093 | uid_eq(cred->suid, fc->user_id) && | |
1094 | uid_eq(cred->uid, fc->user_id) && | |
1095 | gid_eq(cred->egid, fc->group_id) && | |
1096 | gid_eq(cred->sgid, fc->group_id) && | |
1097 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1098 | return 1; |
c69e8d9c | 1099 | |
c2132c1b | 1100 | return 0; |
87729a55 MS |
1101 | } |
1102 | ||
31d40d74 MS |
1103 | static int fuse_access(struct inode *inode, int mask) |
1104 | { | |
1105 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 1106 | FUSE_ARGS(args); |
31d40d74 MS |
1107 | struct fuse_access_in inarg; |
1108 | int err; | |
1109 | ||
698fa1d1 MS |
1110 | BUG_ON(mask & MAY_NOT_BLOCK); |
1111 | ||
31d40d74 MS |
1112 | if (fc->no_access) |
1113 | return 0; | |
1114 | ||
31d40d74 | 1115 | memset(&inarg, 0, sizeof(inarg)); |
e6305c43 | 1116 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
d5b48543 MS |
1117 | args.opcode = FUSE_ACCESS; |
1118 | args.nodeid = get_node_id(inode); | |
1119 | args.in_numargs = 1; | |
1120 | args.in_args[0].size = sizeof(inarg); | |
1121 | args.in_args[0].value = &inarg; | |
7078187a | 1122 | err = fuse_simple_request(fc, &args); |
31d40d74 MS |
1123 | if (err == -ENOSYS) { |
1124 | fc->no_access = 1; | |
1125 | err = 0; | |
1126 | } | |
1127 | return err; | |
1128 | } | |
1129 | ||
10556cb2 | 1130 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1131 | { |
10556cb2 | 1132 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1133 | return -ECHILD; |
1134 | ||
60bcc88a | 1135 | forget_all_cached_acls(inode); |
19690ddb MS |
1136 | return fuse_do_getattr(inode, NULL, NULL); |
1137 | } | |
1138 | ||
6f9f1180 MS |
1139 | /* |
1140 | * Check permission. The two basic access models of FUSE are: | |
1141 | * | |
1142 | * 1) Local access checking ('default_permissions' mount option) based | |
1143 | * on file mode. This is the plain old disk filesystem permission | |
1144 | * modell. | |
1145 | * | |
1146 | * 2) "Remote" access checking, where server is responsible for | |
1147 | * checking permission in each inode operation. An exception to this | |
1148 | * is if ->permission() was invoked from sys_access() in which case an | |
1149 | * access request is sent. Execute permission is still checked | |
1150 | * locally based on file mode. | |
1151 | */ | |
10556cb2 | 1152 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1153 | { |
1154 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1155 | bool refreshed = false; |
1156 | int err = 0; | |
e5e5558e | 1157 | |
c2132c1b | 1158 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1159 | return -EACCES; |
244f6385 MS |
1160 | |
1161 | /* | |
e8e96157 | 1162 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1163 | */ |
29433a29 | 1164 | if (fc->default_permissions || |
e8e96157 | 1165 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { |
19690ddb | 1166 | struct fuse_inode *fi = get_fuse_inode(inode); |
d233c7dd | 1167 | u32 perm_mask = STATX_MODE | STATX_UID | STATX_GID; |
19690ddb | 1168 | |
d233c7dd MS |
1169 | if (perm_mask & READ_ONCE(fi->inval_mask) || |
1170 | time_before64(fi->i_time, get_jiffies_64())) { | |
19690ddb MS |
1171 | refreshed = true; |
1172 | ||
10556cb2 | 1173 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1174 | if (err) |
1175 | return err; | |
1176 | } | |
244f6385 MS |
1177 | } |
1178 | ||
29433a29 | 1179 | if (fc->default_permissions) { |
2830ba7f | 1180 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1181 | |
1182 | /* If permission is denied, try to refresh file | |
1183 | attributes. This is also needed, because the root | |
1184 | node will at first have no permissions */ | |
244f6385 | 1185 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1186 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1187 | if (!err) |
2830ba7f | 1188 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1189 | } |
1190 | ||
6f9f1180 MS |
1191 | /* Note: the opposite of the above test does not |
1192 | exist. So if permissions are revoked this won't be | |
1193 | noticed immediately, only after the attribute | |
1194 | timeout has expired */ | |
9cfcac81 | 1195 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1196 | err = fuse_access(inode, mask); |
1197 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1198 | if (!(inode->i_mode & S_IXUGO)) { | |
1199 | if (refreshed) | |
1200 | return -EACCES; | |
1201 | ||
10556cb2 | 1202 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1203 | if (!err && !(inode->i_mode & S_IXUGO)) |
1204 | return -EACCES; | |
1205 | } | |
e5e5558e | 1206 | } |
244f6385 | 1207 | return err; |
e5e5558e MS |
1208 | } |
1209 | ||
5571f1e6 | 1210 | static int fuse_readlink_page(struct inode *inode, struct page *page) |
e5e5558e | 1211 | { |
e5e5558e | 1212 | struct fuse_conn *fc = get_fuse_conn(inode); |
4c29afec MS |
1213 | struct fuse_page_desc desc = { .length = PAGE_SIZE - 1 }; |
1214 | struct fuse_args_pages ap = { | |
1215 | .num_pages = 1, | |
1216 | .pages = &page, | |
1217 | .descs = &desc, | |
1218 | }; | |
1219 | char *link; | |
1220 | ssize_t res; | |
1221 | ||
1222 | ap.args.opcode = FUSE_READLINK; | |
1223 | ap.args.nodeid = get_node_id(inode); | |
1224 | ap.args.out_pages = true; | |
1225 | ap.args.out_argvar = true; | |
1226 | ap.args.page_zeroing = true; | |
1227 | ap.args.out_numargs = 1; | |
1228 | ap.args.out_args[0].size = desc.length; | |
1229 | res = fuse_simple_request(fc, &ap.args); | |
e5e5558e | 1230 | |
4c29afec | 1231 | fuse_invalidate_atime(inode); |
6b255391 | 1232 | |
4c29afec MS |
1233 | if (res < 0) |
1234 | return res; | |
7078187a | 1235 | |
4c29afec MS |
1236 | if (WARN_ON(res >= PAGE_SIZE)) |
1237 | return -EIO; | |
5571f1e6 | 1238 | |
4c29afec MS |
1239 | link = page_address(page); |
1240 | link[res] = '\0'; | |
5571f1e6 | 1241 | |
4c29afec | 1242 | return 0; |
5571f1e6 DS |
1243 | } |
1244 | ||
1245 | static const char *fuse_get_link(struct dentry *dentry, struct inode *inode, | |
1246 | struct delayed_call *callback) | |
1247 | { | |
1248 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1249 | struct page *page; | |
1250 | int err; | |
1251 | ||
1252 | err = -EIO; | |
1253 | if (is_bad_inode(inode)) | |
1254 | goto out_err; | |
1255 | ||
1256 | if (fc->cache_symlinks) | |
1257 | return page_get_link(dentry, inode, callback); | |
1258 | ||
1259 | err = -ECHILD; | |
1260 | if (!dentry) | |
1261 | goto out_err; | |
1262 | ||
1263 | page = alloc_page(GFP_KERNEL); | |
1264 | err = -ENOMEM; | |
1265 | if (!page) | |
1266 | goto out_err; | |
1267 | ||
1268 | err = fuse_readlink_page(inode, page); | |
1269 | if (err) { | |
1270 | __free_page(page); | |
1271 | goto out_err; | |
1272 | } | |
1273 | ||
1274 | set_delayed_call(callback, page_put_link, page); | |
1275 | ||
1276 | return page_address(page); | |
1277 | ||
1278 | out_err: | |
1279 | return ERR_PTR(err); | |
e5e5558e MS |
1280 | } |
1281 | ||
e5e5558e MS |
1282 | static int fuse_dir_open(struct inode *inode, struct file *file) |
1283 | { | |
91fe96b4 | 1284 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1285 | } |
1286 | ||
1287 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1288 | { | |
2e64ff15 | 1289 | fuse_release_common(file, true); |
8b0797a4 MS |
1290 | |
1291 | return 0; | |
e5e5558e MS |
1292 | } |
1293 | ||
02c24a82 JB |
1294 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1295 | int datasync) | |
82547981 | 1296 | { |
a9c2d1e8 MS |
1297 | struct inode *inode = file->f_mapping->host; |
1298 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1299 | int err; | |
1300 | ||
1301 | if (is_bad_inode(inode)) | |
1302 | return -EIO; | |
1303 | ||
1304 | if (fc->no_fsyncdir) | |
1305 | return 0; | |
1306 | ||
1307 | inode_lock(inode); | |
1308 | err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNCDIR); | |
1309 | if (err == -ENOSYS) { | |
1310 | fc->no_fsyncdir = 1; | |
1311 | err = 0; | |
1312 | } | |
1313 | inode_unlock(inode); | |
1314 | ||
1315 | return err; | |
82547981 MS |
1316 | } |
1317 | ||
b18da0c5 MS |
1318 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1319 | unsigned long arg) | |
1320 | { | |
1321 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1322 | ||
1323 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1324 | if (fc->minor < 18) | |
1325 | return -ENOTTY; | |
1326 | ||
1327 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1328 | } | |
1329 | ||
1330 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1331 | unsigned long arg) | |
1332 | { | |
1333 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1334 | ||
1335 | if (fc->minor < 18) | |
1336 | return -ENOTTY; | |
1337 | ||
1338 | return fuse_ioctl_common(file, cmd, arg, | |
1339 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1340 | } | |
1341 | ||
b0aa7606 | 1342 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
17637cba MS |
1343 | { |
1344 | /* Always update if mtime is explicitly set */ | |
1345 | if (ivalid & ATTR_MTIME_SET) | |
1346 | return true; | |
1347 | ||
b0aa7606 MP |
1348 | /* Or if kernel i_mtime is the official one */ |
1349 | if (trust_local_mtime) | |
1350 | return true; | |
1351 | ||
17637cba MS |
1352 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
1353 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1354 | return false; | |
1355 | ||
1356 | /* In all other cases update */ | |
1357 | return true; | |
1358 | } | |
1359 | ||
8cb08329 EB |
1360 | static void iattr_to_fattr(struct fuse_conn *fc, struct iattr *iattr, |
1361 | struct fuse_setattr_in *arg, bool trust_local_cmtime) | |
9e6268db MS |
1362 | { |
1363 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1364 | |
1365 | if (ivalid & ATTR_MODE) | |
befc649c | 1366 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1367 | if (ivalid & ATTR_UID) |
8cb08329 | 1368 | arg->valid |= FATTR_UID, arg->uid = from_kuid(fc->user_ns, iattr->ia_uid); |
9e6268db | 1369 | if (ivalid & ATTR_GID) |
8cb08329 | 1370 | arg->valid |= FATTR_GID, arg->gid = from_kgid(fc->user_ns, iattr->ia_gid); |
9e6268db | 1371 | if (ivalid & ATTR_SIZE) |
befc649c | 1372 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1373 | if (ivalid & ATTR_ATIME) { |
1374 | arg->valid |= FATTR_ATIME; | |
befc649c | 1375 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1376 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1377 | if (!(ivalid & ATTR_ATIME_SET)) | |
1378 | arg->valid |= FATTR_ATIME_NOW; | |
1379 | } | |
3ad22c62 | 1380 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
17637cba | 1381 | arg->valid |= FATTR_MTIME; |
befc649c | 1382 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba | 1383 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
3ad22c62 | 1384 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
17637cba | 1385 | arg->valid |= FATTR_MTIME_NOW; |
befc649c | 1386 | } |
3ad22c62 MP |
1387 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
1388 | arg->valid |= FATTR_CTIME; | |
1389 | arg->ctime = iattr->ia_ctime.tv_sec; | |
1390 | arg->ctimensec = iattr->ia_ctime.tv_nsec; | |
1391 | } | |
9e6268db MS |
1392 | } |
1393 | ||
3be5a52b MS |
1394 | /* |
1395 | * Prevent concurrent writepages on inode | |
1396 | * | |
1397 | * This is done by adding a negative bias to the inode write counter | |
1398 | * and waiting for all pending writes to finish. | |
1399 | */ | |
1400 | void fuse_set_nowrite(struct inode *inode) | |
1401 | { | |
3be5a52b MS |
1402 | struct fuse_inode *fi = get_fuse_inode(inode); |
1403 | ||
5955102c | 1404 | BUG_ON(!inode_is_locked(inode)); |
3be5a52b | 1405 | |
f15ecfef | 1406 | spin_lock(&fi->lock); |
3be5a52b MS |
1407 | BUG_ON(fi->writectr < 0); |
1408 | fi->writectr += FUSE_NOWRITE; | |
f15ecfef | 1409 | spin_unlock(&fi->lock); |
3be5a52b MS |
1410 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * Allow writepages on inode | |
1415 | * | |
1416 | * Remove the bias from the writecounter and send any queued | |
1417 | * writepages. | |
1418 | */ | |
1419 | static void __fuse_release_nowrite(struct inode *inode) | |
1420 | { | |
1421 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1422 | ||
1423 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1424 | fi->writectr = 0; | |
1425 | fuse_flush_writepages(inode); | |
1426 | } | |
1427 | ||
1428 | void fuse_release_nowrite(struct inode *inode) | |
1429 | { | |
f15ecfef | 1430 | struct fuse_inode *fi = get_fuse_inode(inode); |
3be5a52b | 1431 | |
f15ecfef | 1432 | spin_lock(&fi->lock); |
3be5a52b | 1433 | __fuse_release_nowrite(inode); |
f15ecfef | 1434 | spin_unlock(&fi->lock); |
3be5a52b MS |
1435 | } |
1436 | ||
7078187a | 1437 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args, |
b0aa7606 MP |
1438 | struct inode *inode, |
1439 | struct fuse_setattr_in *inarg_p, | |
1440 | struct fuse_attr_out *outarg_p) | |
1441 | { | |
d5b48543 MS |
1442 | args->opcode = FUSE_SETATTR; |
1443 | args->nodeid = get_node_id(inode); | |
1444 | args->in_numargs = 1; | |
1445 | args->in_args[0].size = sizeof(*inarg_p); | |
1446 | args->in_args[0].value = inarg_p; | |
1447 | args->out_numargs = 1; | |
1448 | args->out_args[0].size = sizeof(*outarg_p); | |
1449 | args->out_args[0].value = outarg_p; | |
b0aa7606 MP |
1450 | } |
1451 | ||
1452 | /* | |
1453 | * Flush inode->i_mtime to the server | |
1454 | */ | |
ab9e13f7 | 1455 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
b0aa7606 | 1456 | { |
b0aa7606 | 1457 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a | 1458 | FUSE_ARGS(args); |
b0aa7606 MP |
1459 | struct fuse_setattr_in inarg; |
1460 | struct fuse_attr_out outarg; | |
b0aa7606 MP |
1461 | |
1462 | memset(&inarg, 0, sizeof(inarg)); | |
1463 | memset(&outarg, 0, sizeof(outarg)); | |
1464 | ||
ab9e13f7 | 1465 | inarg.valid = FATTR_MTIME; |
b0aa7606 MP |
1466 | inarg.mtime = inode->i_mtime.tv_sec; |
1467 | inarg.mtimensec = inode->i_mtime.tv_nsec; | |
ab9e13f7 MP |
1468 | if (fc->minor >= 23) { |
1469 | inarg.valid |= FATTR_CTIME; | |
1470 | inarg.ctime = inode->i_ctime.tv_sec; | |
1471 | inarg.ctimensec = inode->i_ctime.tv_nsec; | |
1472 | } | |
1e18bda8 MS |
1473 | if (ff) { |
1474 | inarg.valid |= FATTR_FH; | |
1475 | inarg.fh = ff->fh; | |
1476 | } | |
7078187a | 1477 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
b0aa7606 | 1478 | |
7078187a | 1479 | return fuse_simple_request(fc, &args); |
b0aa7606 MP |
1480 | } |
1481 | ||
6f9f1180 MS |
1482 | /* |
1483 | * Set attributes, and at the same time refresh them. | |
1484 | * | |
1485 | * Truncation is slightly complicated, because the 'truncate' request | |
1486 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1487 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1488 | * and the actual truncation by hand. | |
6f9f1180 | 1489 | */ |
62490330 | 1490 | int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, |
efb9fa9e | 1491 | struct file *file) |
9e6268db | 1492 | { |
62490330 | 1493 | struct inode *inode = d_inode(dentry); |
9e6268db | 1494 | struct fuse_conn *fc = get_fuse_conn(inode); |
06a7c3c2 | 1495 | struct fuse_inode *fi = get_fuse_inode(inode); |
7078187a | 1496 | FUSE_ARGS(args); |
9e6268db MS |
1497 | struct fuse_setattr_in inarg; |
1498 | struct fuse_attr_out outarg; | |
3be5a52b | 1499 | bool is_truncate = false; |
8373200b | 1500 | bool is_wb = fc->writeback_cache; |
3be5a52b | 1501 | loff_t oldsize; |
9e6268db | 1502 | int err; |
3ad22c62 | 1503 | bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode); |
9e6268db | 1504 | |
29433a29 | 1505 | if (!fc->default_permissions) |
db78b877 CH |
1506 | attr->ia_valid |= ATTR_FORCE; |
1507 | ||
31051c85 | 1508 | err = setattr_prepare(dentry, attr); |
db78b877 CH |
1509 | if (err) |
1510 | return err; | |
1e9a4ed9 | 1511 | |
8d56addd | 1512 | if (attr->ia_valid & ATTR_OPEN) { |
df0e91d4 MS |
1513 | /* This is coming from open(..., ... | O_TRUNC); */ |
1514 | WARN_ON(!(attr->ia_valid & ATTR_SIZE)); | |
1515 | WARN_ON(attr->ia_size != 0); | |
1516 | if (fc->atomic_o_trunc) { | |
1517 | /* | |
1518 | * No need to send request to userspace, since actual | |
1519 | * truncation has already been done by OPEN. But still | |
1520 | * need to truncate page cache. | |
1521 | */ | |
1522 | i_size_write(inode, 0); | |
1523 | truncate_pagecache(inode, 0); | |
8d56addd | 1524 | return 0; |
df0e91d4 | 1525 | } |
8d56addd MS |
1526 | file = NULL; |
1527 | } | |
6ff958ed | 1528 | |
ab2257e9 MS |
1529 | if (attr->ia_valid & ATTR_SIZE) { |
1530 | if (WARN_ON(!S_ISREG(inode->i_mode))) | |
1531 | return -EIO; | |
3be5a52b | 1532 | is_truncate = true; |
ab2257e9 | 1533 | } |
9e6268db | 1534 | |
b24e7598 MS |
1535 | /* Flush dirty data/metadata before non-truncate SETATTR */ |
1536 | if (is_wb && S_ISREG(inode->i_mode) && | |
1537 | attr->ia_valid & | |
1538 | (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_MTIME_SET | | |
1539 | ATTR_TIMES_SET)) { | |
1540 | err = write_inode_now(inode, true); | |
1541 | if (err) | |
1542 | return err; | |
1543 | ||
1544 | fuse_set_nowrite(inode); | |
1545 | fuse_release_nowrite(inode); | |
1546 | } | |
1547 | ||
06a7c3c2 | 1548 | if (is_truncate) { |
3be5a52b | 1549 | fuse_set_nowrite(inode); |
06a7c3c2 | 1550 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3ad22c62 MP |
1551 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
1552 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; | |
06a7c3c2 | 1553 | } |
3be5a52b | 1554 | |
9e6268db | 1555 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1556 | memset(&outarg, 0, sizeof(outarg)); |
8cb08329 | 1557 | iattr_to_fattr(fc, attr, &inarg, trust_local_cmtime); |
49d4914f MS |
1558 | if (file) { |
1559 | struct fuse_file *ff = file->private_data; | |
1560 | inarg.valid |= FATTR_FH; | |
1561 | inarg.fh = ff->fh; | |
1562 | } | |
f3332114 MS |
1563 | if (attr->ia_valid & ATTR_SIZE) { |
1564 | /* For mandatory locking in truncate */ | |
1565 | inarg.valid |= FATTR_LOCKOWNER; | |
1566 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
1567 | } | |
7078187a MS |
1568 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
1569 | err = fuse_simple_request(fc, &args); | |
e00d2c2d MS |
1570 | if (err) { |
1571 | if (err == -EINTR) | |
1572 | fuse_invalidate_attr(inode); | |
3be5a52b | 1573 | goto error; |
e00d2c2d | 1574 | } |
9e6268db | 1575 | |
eb59bd17 MS |
1576 | if (fuse_invalid_attr(&outarg.attr) || |
1577 | (inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
e00d2c2d | 1578 | make_bad_inode(inode); |
3be5a52b MS |
1579 | err = -EIO; |
1580 | goto error; | |
1581 | } | |
1582 | ||
f15ecfef | 1583 | spin_lock(&fi->lock); |
b0aa7606 | 1584 | /* the kernel maintains i_mtime locally */ |
3ad22c62 MP |
1585 | if (trust_local_cmtime) { |
1586 | if (attr->ia_valid & ATTR_MTIME) | |
1587 | inode->i_mtime = attr->ia_mtime; | |
1588 | if (attr->ia_valid & ATTR_CTIME) | |
1589 | inode->i_ctime = attr->ia_ctime; | |
1e18bda8 | 1590 | /* FIXME: clear I_DIRTY_SYNC? */ |
b0aa7606 MP |
1591 | } |
1592 | ||
3be5a52b MS |
1593 | fuse_change_attributes_common(inode, &outarg.attr, |
1594 | attr_timeout(&outarg)); | |
1595 | oldsize = inode->i_size; | |
8373200b PE |
1596 | /* see the comment in fuse_change_attributes() */ |
1597 | if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) | |
1598 | i_size_write(inode, outarg.attr.size); | |
3be5a52b MS |
1599 | |
1600 | if (is_truncate) { | |
f15ecfef | 1601 | /* NOTE: this may release/reacquire fi->lock */ |
3be5a52b MS |
1602 | __fuse_release_nowrite(inode); |
1603 | } | |
f15ecfef | 1604 | spin_unlock(&fi->lock); |
3be5a52b MS |
1605 | |
1606 | /* | |
1607 | * Only call invalidate_inode_pages2() after removing | |
1608 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1609 | */ | |
8373200b PE |
1610 | if ((is_truncate || !is_wb) && |
1611 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1612 | truncate_pagecache(inode, outarg.attr.size); |
3be5a52b | 1613 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1614 | } |
1615 | ||
06a7c3c2 | 1616 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
e00d2c2d | 1617 | return 0; |
3be5a52b MS |
1618 | |
1619 | error: | |
1620 | if (is_truncate) | |
1621 | fuse_release_nowrite(inode); | |
1622 | ||
06a7c3c2 | 1623 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3be5a52b | 1624 | return err; |
9e6268db MS |
1625 | } |
1626 | ||
49d4914f MS |
1627 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1628 | { | |
2b0143b5 | 1629 | struct inode *inode = d_inode(entry); |
5e940c1d | 1630 | struct fuse_conn *fc = get_fuse_conn(inode); |
a09f99ed | 1631 | struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL; |
5e2b8828 | 1632 | int ret; |
efb9fa9e MP |
1633 | |
1634 | if (!fuse_allow_current_process(get_fuse_conn(inode))) | |
1635 | return -EACCES; | |
1636 | ||
a09f99ed | 1637 | if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) { |
a09f99ed MS |
1638 | attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | |
1639 | ATTR_MODE); | |
5e940c1d | 1640 | |
a09f99ed | 1641 | /* |
5e940c1d MS |
1642 | * The only sane way to reliably kill suid/sgid is to do it in |
1643 | * the userspace filesystem | |
1644 | * | |
1645 | * This should be done on write(), truncate() and chown(). | |
a09f99ed | 1646 | */ |
5e940c1d | 1647 | if (!fc->handle_killpriv) { |
5e940c1d MS |
1648 | /* |
1649 | * ia_mode calculation may have used stale i_mode. | |
1650 | * Refresh and recalculate. | |
1651 | */ | |
1652 | ret = fuse_do_getattr(inode, NULL, file); | |
1653 | if (ret) | |
1654 | return ret; | |
1655 | ||
1656 | attr->ia_mode = inode->i_mode; | |
c01638f5 | 1657 | if (inode->i_mode & S_ISUID) { |
5e940c1d MS |
1658 | attr->ia_valid |= ATTR_MODE; |
1659 | attr->ia_mode &= ~S_ISUID; | |
1660 | } | |
c01638f5 | 1661 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { |
5e940c1d MS |
1662 | attr->ia_valid |= ATTR_MODE; |
1663 | attr->ia_mode &= ~S_ISGID; | |
1664 | } | |
a09f99ed MS |
1665 | } |
1666 | } | |
1667 | if (!attr->ia_valid) | |
1668 | return 0; | |
5e2b8828 | 1669 | |
abb5a14f | 1670 | ret = fuse_do_setattr(entry, attr, file); |
5e2b8828 | 1671 | if (!ret) { |
60bcc88a SF |
1672 | /* |
1673 | * If filesystem supports acls it may have updated acl xattrs in | |
1674 | * the filesystem, so forget cached acls for the inode. | |
1675 | */ | |
1676 | if (fc->posix_acl) | |
1677 | forget_all_cached_acls(inode); | |
1678 | ||
5e2b8828 MS |
1679 | /* Directory mode changed, may need to revalidate access */ |
1680 | if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE)) | |
1681 | fuse_invalidate_entry_cache(entry); | |
1682 | } | |
1683 | return ret; | |
49d4914f MS |
1684 | } |
1685 | ||
a528d35e DH |
1686 | static int fuse_getattr(const struct path *path, struct kstat *stat, |
1687 | u32 request_mask, unsigned int flags) | |
e5e5558e | 1688 | { |
a528d35e | 1689 | struct inode *inode = d_inode(path->dentry); |
244f6385 | 1690 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1691 | |
c2132c1b | 1692 | if (!fuse_allow_current_process(fc)) |
244f6385 MS |
1693 | return -EACCES; |
1694 | ||
2f1e8196 | 1695 | return fuse_update_get_attr(inode, NULL, stat, request_mask, flags); |
e5e5558e MS |
1696 | } |
1697 | ||
754661f1 | 1698 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1699 | .lookup = fuse_lookup, |
9e6268db MS |
1700 | .mkdir = fuse_mkdir, |
1701 | .symlink = fuse_symlink, | |
1702 | .unlink = fuse_unlink, | |
1703 | .rmdir = fuse_rmdir, | |
2773bf00 | 1704 | .rename = fuse_rename2, |
9e6268db MS |
1705 | .link = fuse_link, |
1706 | .setattr = fuse_setattr, | |
1707 | .create = fuse_create, | |
c8ccbe03 | 1708 | .atomic_open = fuse_atomic_open, |
9e6268db | 1709 | .mknod = fuse_mknod, |
e5e5558e MS |
1710 | .permission = fuse_permission, |
1711 | .getattr = fuse_getattr, | |
92a8780e | 1712 | .listxattr = fuse_listxattr, |
60bcc88a SF |
1713 | .get_acl = fuse_get_acl, |
1714 | .set_acl = fuse_set_acl, | |
e5e5558e MS |
1715 | }; |
1716 | ||
4b6f5d20 | 1717 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1718 | .llseek = generic_file_llseek, |
e5e5558e | 1719 | .read = generic_read_dir, |
d9b3dbdc | 1720 | .iterate_shared = fuse_readdir, |
e5e5558e MS |
1721 | .open = fuse_dir_open, |
1722 | .release = fuse_dir_release, | |
82547981 | 1723 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1724 | .unlocked_ioctl = fuse_dir_ioctl, |
1725 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1726 | }; |
1727 | ||
754661f1 | 1728 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1729 | .setattr = fuse_setattr, |
e5e5558e MS |
1730 | .permission = fuse_permission, |
1731 | .getattr = fuse_getattr, | |
92a8780e | 1732 | .listxattr = fuse_listxattr, |
60bcc88a SF |
1733 | .get_acl = fuse_get_acl, |
1734 | .set_acl = fuse_set_acl, | |
e5e5558e MS |
1735 | }; |
1736 | ||
754661f1 | 1737 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1738 | .setattr = fuse_setattr, |
6b255391 | 1739 | .get_link = fuse_get_link, |
e5e5558e | 1740 | .getattr = fuse_getattr, |
92a8780e | 1741 | .listxattr = fuse_listxattr, |
e5e5558e MS |
1742 | }; |
1743 | ||
1744 | void fuse_init_common(struct inode *inode) | |
1745 | { | |
1746 | inode->i_op = &fuse_common_inode_operations; | |
1747 | } | |
1748 | ||
1749 | void fuse_init_dir(struct inode *inode) | |
1750 | { | |
ab2257e9 MS |
1751 | struct fuse_inode *fi = get_fuse_inode(inode); |
1752 | ||
e5e5558e MS |
1753 | inode->i_op = &fuse_dir_inode_operations; |
1754 | inode->i_fop = &fuse_dir_operations; | |
ab2257e9 MS |
1755 | |
1756 | spin_lock_init(&fi->rdc.lock); | |
1757 | fi->rdc.cached = false; | |
1758 | fi->rdc.size = 0; | |
1759 | fi->rdc.pos = 0; | |
1760 | fi->rdc.version = 0; | |
e5e5558e MS |
1761 | } |
1762 | ||
5571f1e6 DS |
1763 | static int fuse_symlink_readpage(struct file *null, struct page *page) |
1764 | { | |
1765 | int err = fuse_readlink_page(page->mapping->host, page); | |
1766 | ||
1767 | if (!err) | |
1768 | SetPageUptodate(page); | |
1769 | ||
1770 | unlock_page(page); | |
1771 | ||
1772 | return err; | |
1773 | } | |
1774 | ||
1775 | static const struct address_space_operations fuse_symlink_aops = { | |
1776 | .readpage = fuse_symlink_readpage, | |
1777 | }; | |
1778 | ||
e5e5558e MS |
1779 | void fuse_init_symlink(struct inode *inode) |
1780 | { | |
1781 | inode->i_op = &fuse_symlink_inode_operations; | |
5571f1e6 DS |
1782 | inode->i_data.a_ops = &fuse_symlink_aops; |
1783 | inode_nohighmem(inode); | |
e5e5558e | 1784 | } |