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> | |
bf109c64 | 13 | #include <linux/fs_context.h> |
e5e5558e MS |
14 | #include <linux/sched.h> |
15 | #include <linux/namei.h> | |
07e77dca | 16 | #include <linux/slab.h> |
703c7362 | 17 | #include <linux/xattr.h> |
261aaba7 | 18 | #include <linux/iversion.h> |
60bcc88a | 19 | #include <linux/posix_acl.h> |
3e2b6fdb VG |
20 | #include <linux/security.h> |
21 | #include <linux/types.h> | |
22 | #include <linux/kernel.h> | |
e5e5558e | 23 | |
4582a4ab FS |
24 | static void fuse_advise_use_readdirplus(struct inode *dir) |
25 | { | |
26 | struct fuse_inode *fi = get_fuse_inode(dir); | |
27 | ||
28 | set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state); | |
29 | } | |
30 | ||
30c6a23d KK |
31 | #if BITS_PER_LONG >= 64 |
32 | static inline void __fuse_dentry_settime(struct dentry *entry, u64 time) | |
33 | { | |
34 | entry->d_fsdata = (void *) time; | |
35 | } | |
36 | ||
37 | static inline u64 fuse_dentry_time(const struct dentry *entry) | |
38 | { | |
39 | return (u64)entry->d_fsdata; | |
40 | } | |
41 | ||
42 | #else | |
f75fdf22 MS |
43 | union fuse_dentry { |
44 | u64 time; | |
45 | struct rcu_head rcu; | |
46 | }; | |
47 | ||
30c6a23d KK |
48 | static inline void __fuse_dentry_settime(struct dentry *dentry, u64 time) |
49 | { | |
50 | ((union fuse_dentry *) dentry->d_fsdata)->time = time; | |
51 | } | |
52 | ||
53 | static inline u64 fuse_dentry_time(const struct dentry *entry) | |
54 | { | |
55 | return ((union fuse_dentry *) entry->d_fsdata)->time; | |
56 | } | |
57 | #endif | |
58 | ||
8fab0106 | 59 | static void fuse_dentry_settime(struct dentry *dentry, u64 time) |
0a0898cf | 60 | { |
8fab0106 MS |
61 | struct fuse_conn *fc = get_fuse_conn_super(dentry->d_sb); |
62 | bool delete = !time && fc->delete_stale; | |
63 | /* | |
64 | * Mess with DCACHE_OP_DELETE because dput() will be faster without it. | |
65 | * Don't care about races, either way it's just an optimization | |
66 | */ | |
67 | if ((!delete && (dentry->d_flags & DCACHE_OP_DELETE)) || | |
68 | (delete && !(dentry->d_flags & DCACHE_OP_DELETE))) { | |
69 | spin_lock(&dentry->d_lock); | |
70 | if (!delete) | |
71 | dentry->d_flags &= ~DCACHE_OP_DELETE; | |
72 | else | |
73 | dentry->d_flags |= DCACHE_OP_DELETE; | |
74 | spin_unlock(&dentry->d_lock); | |
75 | } | |
76 | ||
30c6a23d | 77 | __fuse_dentry_settime(dentry, time); |
0a0898cf | 78 | } |
0a0898cf | 79 | |
6f9f1180 MS |
80 | /* |
81 | * FUSE caches dentries and attributes with separate timeout. The | |
82 | * time in jiffies until the dentry/attributes are valid is stored in | |
f75fdf22 | 83 | * dentry->d_fsdata and fuse_inode->i_time respectively. |
6f9f1180 MS |
84 | */ |
85 | ||
86 | /* | |
87 | * Calculate the time in jiffies until a dentry/attributes are valid | |
88 | */ | |
bcb6f6d2 | 89 | static u64 time_to_jiffies(u64 sec, u32 nsec) |
e5e5558e | 90 | { |
685d16dd | 91 | if (sec || nsec) { |
bcb6f6d2 MS |
92 | struct timespec64 ts = { |
93 | sec, | |
21067527 | 94 | min_t(u32, nsec, NSEC_PER_SEC - 1) |
bcb6f6d2 MS |
95 | }; |
96 | ||
97 | return get_jiffies_64() + timespec64_to_jiffies(&ts); | |
685d16dd | 98 | } else |
0a0898cf | 99 | return 0; |
e5e5558e MS |
100 | } |
101 | ||
6f9f1180 MS |
102 | /* |
103 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
104 | * replies | |
105 | */ | |
d123d8e1 | 106 | void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o) |
0aa7c699 | 107 | { |
0a0898cf MS |
108 | fuse_dentry_settime(entry, |
109 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
1fb69e78 MS |
110 | } |
111 | ||
112 | static u64 attr_timeout(struct fuse_attr_out *o) | |
113 | { | |
114 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
115 | } | |
116 | ||
d123d8e1 | 117 | u64 entry_attr_timeout(struct fuse_entry_out *o) |
1fb69e78 MS |
118 | { |
119 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
8cbdf1e6 MS |
120 | } |
121 | ||
fa5eee57 | 122 | void fuse_invalidate_attr_mask(struct inode *inode, u32 mask) |
2f1e8196 MS |
123 | { |
124 | set_mask_bits(&get_fuse_inode(inode)->inval_mask, 0, mask); | |
125 | } | |
126 | ||
6f9f1180 MS |
127 | /* |
128 | * Mark the attributes as stale, so that at the next call to | |
129 | * ->getattr() they will be fetched from userspace | |
130 | */ | |
8cbdf1e6 MS |
131 | void fuse_invalidate_attr(struct inode *inode) |
132 | { | |
2f1e8196 | 133 | fuse_invalidate_attr_mask(inode, STATX_BASIC_STATS); |
8cbdf1e6 MS |
134 | } |
135 | ||
261aaba7 MS |
136 | static void fuse_dir_changed(struct inode *dir) |
137 | { | |
138 | fuse_invalidate_attr(dir); | |
139 | inode_maybe_inc_iversion(dir, false); | |
140 | } | |
141 | ||
451418fc AG |
142 | /** |
143 | * Mark the attributes as stale due to an atime change. Avoid the invalidate if | |
144 | * atime is not used. | |
145 | */ | |
146 | void fuse_invalidate_atime(struct inode *inode) | |
147 | { | |
148 | if (!IS_RDONLY(inode)) | |
2f1e8196 | 149 | fuse_invalidate_attr_mask(inode, STATX_ATIME); |
451418fc AG |
150 | } |
151 | ||
6f9f1180 MS |
152 | /* |
153 | * Just mark the entry as stale, so that a next attempt to look it up | |
154 | * will result in a new lookup call to userspace | |
155 | * | |
156 | * This is called when a dentry is about to become negative and the | |
157 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
158 | * lookup) | |
159 | */ | |
dbd561d2 | 160 | void fuse_invalidate_entry_cache(struct dentry *entry) |
8cbdf1e6 | 161 | { |
0a0898cf | 162 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
163 | } |
164 | ||
6f9f1180 MS |
165 | /* |
166 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
167 | * dentry from the hash | |
168 | */ | |
8cbdf1e6 MS |
169 | static void fuse_invalidate_entry(struct dentry *entry) |
170 | { | |
171 | d_invalidate(entry); | |
172 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
173 | } |
174 | ||
7078187a | 175 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, |
13983d06 | 176 | u64 nodeid, const struct qstr *name, |
e5e5558e MS |
177 | struct fuse_entry_out *outarg) |
178 | { | |
0e9663ee | 179 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
d5b48543 MS |
180 | args->opcode = FUSE_LOOKUP; |
181 | args->nodeid = nodeid; | |
182 | args->in_numargs = 1; | |
183 | args->in_args[0].size = name->len + 1; | |
184 | args->in_args[0].value = name->name; | |
185 | args->out_numargs = 1; | |
186 | args->out_args[0].size = sizeof(struct fuse_entry_out); | |
187 | args->out_args[0].value = outarg; | |
e5e5558e MS |
188 | } |
189 | ||
6f9f1180 MS |
190 | /* |
191 | * Check whether the dentry is still valid | |
192 | * | |
193 | * If the entry validity timeout has expired and the dentry is | |
194 | * positive, try to redo the lookup. If the lookup results in a | |
195 | * different inode, then let the VFS invalidate the dentry and redo | |
196 | * the lookup once more. If the lookup results in the same inode, | |
197 | * then refresh the attributes, timeouts and mark the dentry valid. | |
198 | */ | |
0b728e19 | 199 | static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) |
e5e5558e | 200 | { |
34286d66 | 201 | struct inode *inode; |
28420dad | 202 | struct dentry *parent; |
fcee216b | 203 | struct fuse_mount *fm; |
6314efee | 204 | struct fuse_inode *fi; |
e2a6b952 | 205 | int ret; |
8cbdf1e6 | 206 | |
2b0143b5 | 207 | inode = d_inode_rcu(entry); |
5d069dbe | 208 | if (inode && fuse_is_bad(inode)) |
e2a6b952 | 209 | goto invalid; |
154210cc | 210 | else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) || |
df8629af | 211 | (flags & (LOOKUP_EXCL | LOOKUP_REVAL))) { |
e5e5558e | 212 | struct fuse_entry_out outarg; |
7078187a | 213 | FUSE_ARGS(args); |
07e77dca | 214 | struct fuse_forget_link *forget; |
1fb69e78 | 215 | u64 attr_version; |
8cbdf1e6 | 216 | |
50322fe7 | 217 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 | 218 | if (!inode) |
e2a6b952 | 219 | goto invalid; |
8cbdf1e6 | 220 | |
e2a6b952 | 221 | ret = -ECHILD; |
0b728e19 | 222 | if (flags & LOOKUP_RCU) |
e2a6b952 | 223 | goto out; |
e7c0a167 | 224 | |
fcee216b | 225 | fm = get_fuse_mount(inode); |
e5e5558e | 226 | |
07e77dca | 227 | forget = fuse_alloc_forget(); |
7078187a MS |
228 | ret = -ENOMEM; |
229 | if (!forget) | |
e2a6b952 | 230 | goto out; |
2d51013e | 231 | |
fcee216b | 232 | attr_version = fuse_get_attr_version(fm->fc); |
1fb69e78 | 233 | |
e956edd0 | 234 | parent = dget_parent(entry); |
fcee216b | 235 | fuse_lookup_init(fm->fc, &args, get_node_id(d_inode(parent)), |
c180eebe | 236 | &entry->d_name, &outarg); |
fcee216b | 237 | ret = fuse_simple_request(fm, &args); |
e956edd0 | 238 | dput(parent); |
50322fe7 | 239 | /* Zero nodeid is same as -ENOENT */ |
7078187a MS |
240 | if (!ret && !outarg.nodeid) |
241 | ret = -ENOENT; | |
242 | if (!ret) { | |
6314efee | 243 | fi = get_fuse_inode(inode); |
bf109c64 MR |
244 | if (outarg.nodeid != get_node_id(inode) || |
245 | (bool) IS_AUTOMOUNT(inode) != (bool) (outarg.attr.flags & FUSE_ATTR_SUBMOUNT)) { | |
fcee216b MR |
246 | fuse_queue_forget(fm->fc, forget, |
247 | outarg.nodeid, 1); | |
e2a6b952 | 248 | goto invalid; |
9e6268db | 249 | } |
c9d8f5f0 | 250 | spin_lock(&fi->lock); |
1729a16c | 251 | fi->nlookup++; |
c9d8f5f0 | 252 | spin_unlock(&fi->lock); |
9e6268db | 253 | } |
07e77dca | 254 | kfree(forget); |
7078187a MS |
255 | if (ret == -ENOMEM) |
256 | goto out; | |
eb59bd17 | 257 | if (ret || fuse_invalid_attr(&outarg.attr) || |
15db1683 | 258 | fuse_stale_inode(inode, outarg.generation, &outarg.attr)) |
e2a6b952 | 259 | goto invalid; |
e5e5558e | 260 | |
60bcc88a | 261 | forget_all_cached_acls(inode); |
1fb69e78 MS |
262 | fuse_change_attributes(inode, &outarg.attr, |
263 | entry_attr_timeout(&outarg), | |
264 | attr_version); | |
265 | fuse_change_entry_timeout(entry, &outarg); | |
28420dad | 266 | } else if (inode) { |
6314efee MS |
267 | fi = get_fuse_inode(inode); |
268 | if (flags & LOOKUP_RCU) { | |
269 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) | |
270 | return -ECHILD; | |
271 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { | |
28420dad | 272 | parent = dget_parent(entry); |
2b0143b5 | 273 | fuse_advise_use_readdirplus(d_inode(parent)); |
28420dad MS |
274 | dput(parent); |
275 | } | |
e5e5558e | 276 | } |
e2a6b952 MS |
277 | ret = 1; |
278 | out: | |
279 | return ret; | |
280 | ||
281 | invalid: | |
282 | ret = 0; | |
283 | goto out; | |
e5e5558e MS |
284 | } |
285 | ||
30c6a23d | 286 | #if BITS_PER_LONG < 64 |
f75fdf22 MS |
287 | static int fuse_dentry_init(struct dentry *dentry) |
288 | { | |
dc69e98c KK |
289 | dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), |
290 | GFP_KERNEL_ACCOUNT | __GFP_RECLAIMABLE); | |
f75fdf22 MS |
291 | |
292 | return dentry->d_fsdata ? 0 : -ENOMEM; | |
293 | } | |
294 | static void fuse_dentry_release(struct dentry *dentry) | |
295 | { | |
296 | union fuse_dentry *fd = dentry->d_fsdata; | |
297 | ||
298 | kfree_rcu(fd, rcu); | |
299 | } | |
30c6a23d | 300 | #endif |
f75fdf22 | 301 | |
8fab0106 MS |
302 | static int fuse_dentry_delete(const struct dentry *dentry) |
303 | { | |
304 | return time_before64(fuse_dentry_time(dentry), get_jiffies_64()); | |
305 | } | |
306 | ||
bf109c64 MR |
307 | /* |
308 | * Create a fuse_mount object with a new superblock (with path->dentry | |
309 | * as the root), and return that mount so it can be auto-mounted on | |
310 | * @path. | |
311 | */ | |
312 | static struct vfsmount *fuse_dentry_automount(struct path *path) | |
313 | { | |
314 | struct fs_context *fsc; | |
bf109c64 MR |
315 | struct vfsmount *mnt; |
316 | struct fuse_inode *mp_fi = get_fuse_inode(d_inode(path->dentry)); | |
bf109c64 MR |
317 | |
318 | fsc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry); | |
29e0e4df GK |
319 | if (IS_ERR(fsc)) |
320 | return ERR_CAST(fsc); | |
bf109c64 | 321 | |
266eb3f2 GK |
322 | /* Pass the FUSE inode of the mount for fuse_get_tree_submount() */ |
323 | fsc->fs_private = mp_fi; | |
bf109c64 | 324 | |
bf109c64 | 325 | /* Create the submount */ |
29e0e4df GK |
326 | mnt = fc_mount(fsc); |
327 | if (!IS_ERR(mnt)) | |
328 | mntget(mnt); | |
bf109c64 | 329 | |
bf109c64 | 330 | put_fs_context(fsc); |
29e0e4df | 331 | return mnt; |
bf109c64 MR |
332 | } |
333 | ||
4269590a | 334 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e | 335 | .d_revalidate = fuse_dentry_revalidate, |
8fab0106 | 336 | .d_delete = fuse_dentry_delete, |
30c6a23d | 337 | #if BITS_PER_LONG < 64 |
f75fdf22 MS |
338 | .d_init = fuse_dentry_init, |
339 | .d_release = fuse_dentry_release, | |
30c6a23d | 340 | #endif |
bf109c64 | 341 | .d_automount = fuse_dentry_automount, |
e5e5558e MS |
342 | }; |
343 | ||
0ce267ff | 344 | const struct dentry_operations fuse_root_dentry_operations = { |
30c6a23d | 345 | #if BITS_PER_LONG < 64 |
0ce267ff MS |
346 | .d_init = fuse_dentry_init, |
347 | .d_release = fuse_dentry_release, | |
30c6a23d | 348 | #endif |
0ce267ff MS |
349 | }; |
350 | ||
a5bfffac | 351 | int fuse_valid_type(int m) |
39ee059a MS |
352 | { |
353 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
354 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
355 | } | |
356 | ||
eb59bd17 MS |
357 | bool fuse_invalid_attr(struct fuse_attr *attr) |
358 | { | |
359 | return !fuse_valid_type(attr->mode) || | |
360 | attr->size > LLONG_MAX; | |
361 | } | |
362 | ||
13983d06 | 363 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name, |
c180eebe | 364 | struct fuse_entry_out *outarg, struct inode **inode) |
e5e5558e | 365 | { |
fcee216b | 366 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
7078187a | 367 | FUSE_ARGS(args); |
07e77dca | 368 | struct fuse_forget_link *forget; |
1fb69e78 | 369 | u64 attr_version; |
c180eebe | 370 | int err; |
e5e5558e | 371 | |
c180eebe MS |
372 | *inode = NULL; |
373 | err = -ENAMETOOLONG; | |
374 | if (name->len > FUSE_NAME_MAX) | |
375 | goto out; | |
e5e5558e | 376 | |
e5e5558e | 377 | |
07e77dca MS |
378 | forget = fuse_alloc_forget(); |
379 | err = -ENOMEM; | |
7078187a | 380 | if (!forget) |
c180eebe | 381 | goto out; |
2d51013e | 382 | |
fcee216b | 383 | attr_version = fuse_get_attr_version(fm->fc); |
1fb69e78 | 384 | |
fcee216b MR |
385 | fuse_lookup_init(fm->fc, &args, nodeid, name, outarg); |
386 | err = fuse_simple_request(fm, &args); | |
50322fe7 | 387 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
388 | if (err || !outarg->nodeid) |
389 | goto out_put_forget; | |
390 | ||
391 | err = -EIO; | |
392 | if (!outarg->nodeid) | |
393 | goto out_put_forget; | |
eb59bd17 | 394 | if (fuse_invalid_attr(&outarg->attr)) |
c180eebe MS |
395 | goto out_put_forget; |
396 | ||
397 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
398 | &outarg->attr, entry_attr_timeout(outarg), | |
399 | attr_version); | |
400 | err = -ENOMEM; | |
401 | if (!*inode) { | |
fcee216b | 402 | fuse_queue_forget(fm->fc, forget, outarg->nodeid, 1); |
c180eebe | 403 | goto out; |
e5e5558e | 404 | } |
c180eebe MS |
405 | err = 0; |
406 | ||
407 | out_put_forget: | |
07e77dca | 408 | kfree(forget); |
c180eebe MS |
409 | out: |
410 | return err; | |
411 | } | |
412 | ||
413 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 414 | unsigned int flags) |
c180eebe MS |
415 | { |
416 | int err; | |
417 | struct fuse_entry_out outarg; | |
418 | struct inode *inode; | |
419 | struct dentry *newent; | |
c180eebe | 420 | bool outarg_valid = true; |
63576c13 | 421 | bool locked; |
c180eebe | 422 | |
5d069dbe MS |
423 | if (fuse_is_bad(dir)) |
424 | return ERR_PTR(-EIO); | |
425 | ||
63576c13 | 426 | locked = fuse_lock_inode(dir); |
c180eebe MS |
427 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, |
428 | &outarg, &inode); | |
63576c13 | 429 | fuse_unlock_inode(dir, locked); |
c180eebe MS |
430 | if (err == -ENOENT) { |
431 | outarg_valid = false; | |
432 | err = 0; | |
433 | } | |
434 | if (err) | |
435 | goto out_err; | |
436 | ||
437 | err = -EIO; | |
438 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
439 | goto out_iput; | |
e5e5558e | 440 | |
41d28bca | 441 | newent = d_splice_alias(inode, entry); |
5835f339 MS |
442 | err = PTR_ERR(newent); |
443 | if (IS_ERR(newent)) | |
444 | goto out_err; | |
d2a85164 | 445 | |
0de6256d | 446 | entry = newent ? newent : entry; |
c180eebe | 447 | if (outarg_valid) |
1fb69e78 | 448 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
449 | else |
450 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 451 | |
6c26f717 MS |
452 | if (inode) |
453 | fuse_advise_use_readdirplus(dir); | |
0de6256d | 454 | return newent; |
c180eebe MS |
455 | |
456 | out_iput: | |
457 | iput(inode); | |
458 | out_err: | |
459 | return ERR_PTR(err); | |
e5e5558e MS |
460 | } |
461 | ||
3e2b6fdb VG |
462 | static int get_security_context(struct dentry *entry, umode_t mode, |
463 | void **security_ctx, u32 *security_ctxlen) | |
464 | { | |
465 | struct fuse_secctx *fctx; | |
466 | struct fuse_secctx_header *header; | |
467 | void *ctx = NULL, *ptr; | |
468 | u32 ctxlen, total_len = sizeof(*header); | |
469 | int err, nr_ctx = 0; | |
470 | const char *name; | |
471 | size_t namelen; | |
472 | ||
473 | err = security_dentry_init_security(entry, mode, &entry->d_name, | |
474 | &name, &ctx, &ctxlen); | |
475 | if (err) { | |
476 | if (err != -EOPNOTSUPP) | |
477 | goto out_err; | |
478 | /* No LSM is supporting this security hook. Ignore error */ | |
479 | ctxlen = 0; | |
480 | ctx = NULL; | |
481 | } | |
482 | ||
483 | if (ctxlen) { | |
484 | nr_ctx = 1; | |
485 | namelen = strlen(name) + 1; | |
486 | err = -EIO; | |
487 | if (WARN_ON(namelen > XATTR_NAME_MAX + 1 || ctxlen > S32_MAX)) | |
488 | goto out_err; | |
489 | total_len += FUSE_REC_ALIGN(sizeof(*fctx) + namelen + ctxlen); | |
490 | } | |
491 | ||
492 | err = -ENOMEM; | |
493 | header = ptr = kzalloc(total_len, GFP_KERNEL); | |
494 | if (!ptr) | |
495 | goto out_err; | |
496 | ||
497 | header->nr_secctx = nr_ctx; | |
498 | header->size = total_len; | |
499 | ptr += sizeof(*header); | |
500 | if (nr_ctx) { | |
501 | fctx = ptr; | |
502 | fctx->size = ctxlen; | |
503 | ptr += sizeof(*fctx); | |
504 | ||
505 | strcpy(ptr, name); | |
506 | ptr += namelen; | |
507 | ||
508 | memcpy(ptr, ctx, ctxlen); | |
509 | } | |
510 | *security_ctxlen = total_len; | |
511 | *security_ctx = header; | |
512 | err = 0; | |
513 | out_err: | |
514 | kfree(ctx); | |
515 | return err; | |
516 | } | |
517 | ||
6f9f1180 MS |
518 | /* |
519 | * Atomic create+open operation | |
520 | * | |
521 | * If the filesystem doesn't support this, then fall back to separate | |
522 | * 'mknod' + 'open' requests. | |
523 | */ | |
d9585277 | 524 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
54d601cb | 525 | struct file *file, unsigned int flags, |
b452a458 | 526 | umode_t mode) |
fd72faac MS |
527 | { |
528 | int err; | |
529 | struct inode *inode; | |
fcee216b | 530 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a | 531 | FUSE_ARGS(args); |
07e77dca | 532 | struct fuse_forget_link *forget; |
e0a43ddc | 533 | struct fuse_create_in inarg; |
fd72faac MS |
534 | struct fuse_open_out outopen; |
535 | struct fuse_entry_out outentry; | |
ebf84d0c | 536 | struct fuse_inode *fi; |
fd72faac | 537 | struct fuse_file *ff; |
3e2b6fdb VG |
538 | void *security_ctx = NULL; |
539 | u32 security_ctxlen; | |
fd72faac | 540 | |
af109bca MS |
541 | /* Userspace expects S_IFREG in create mode */ |
542 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
543 | ||
07e77dca | 544 | forget = fuse_alloc_forget(); |
c8ccbe03 | 545 | err = -ENOMEM; |
07e77dca | 546 | if (!forget) |
c8ccbe03 | 547 | goto out_err; |
51eb01e7 | 548 | |
ce1d5a49 | 549 | err = -ENOMEM; |
fcee216b | 550 | ff = fuse_file_alloc(fm); |
fd72faac | 551 | if (!ff) |
7078187a | 552 | goto out_put_forget_req; |
fd72faac | 553 | |
fcee216b | 554 | if (!fm->fc->dont_mask) |
e0a43ddc MS |
555 | mode &= ~current_umask(); |
556 | ||
fd72faac MS |
557 | flags &= ~O_NOCTTY; |
558 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 559 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
560 | inarg.flags = flags; |
561 | inarg.mode = mode; | |
e0a43ddc | 562 | inarg.umask = current_umask(); |
643a666a VG |
563 | |
564 | if (fm->fc->handle_killpriv_v2 && (flags & O_TRUNC) && | |
565 | !(flags & O_EXCL) && !capable(CAP_FSETID)) { | |
566 | inarg.open_flags |= FUSE_OPEN_KILL_SUIDGID; | |
567 | } | |
568 | ||
d5b48543 MS |
569 | args.opcode = FUSE_CREATE; |
570 | args.nodeid = get_node_id(dir); | |
571 | args.in_numargs = 2; | |
572 | args.in_args[0].size = sizeof(inarg); | |
573 | args.in_args[0].value = &inarg; | |
574 | args.in_args[1].size = entry->d_name.len + 1; | |
575 | args.in_args[1].value = entry->d_name.name; | |
576 | args.out_numargs = 2; | |
577 | args.out_args[0].size = sizeof(outentry); | |
578 | args.out_args[0].value = &outentry; | |
579 | args.out_args[1].size = sizeof(outopen); | |
580 | args.out_args[1].value = &outopen; | |
3e2b6fdb VG |
581 | |
582 | if (fm->fc->init_security) { | |
583 | err = get_security_context(entry, mode, &security_ctx, | |
584 | &security_ctxlen); | |
585 | if (err) | |
586 | goto out_put_forget_req; | |
587 | ||
588 | args.in_numargs = 3; | |
589 | args.in_args[2].size = security_ctxlen; | |
590 | args.in_args[2].value = security_ctx; | |
591 | } | |
592 | ||
fcee216b | 593 | err = fuse_simple_request(fm, &args); |
3e2b6fdb | 594 | kfree(security_ctx); |
c8ccbe03 | 595 | if (err) |
fd72faac | 596 | goto out_free_ff; |
fd72faac MS |
597 | |
598 | err = -EIO; | |
eb59bd17 MS |
599 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid) || |
600 | fuse_invalid_attr(&outentry.attr)) | |
fd72faac MS |
601 | goto out_free_ff; |
602 | ||
c7b7143c MS |
603 | ff->fh = outopen.fh; |
604 | ff->nodeid = outentry.nodeid; | |
605 | ff->open_flags = outopen.open_flags; | |
fd72faac | 606 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 607 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
608 | if (!inode) { |
609 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
ebf84d0c | 610 | fuse_sync_release(NULL, ff, flags); |
fcee216b | 611 | fuse_queue_forget(fm->fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
612 | err = -ENOMEM; |
613 | goto out_err; | |
fd72faac | 614 | } |
07e77dca | 615 | kfree(forget); |
fd72faac | 616 | d_instantiate(entry, inode); |
1fb69e78 | 617 | fuse_change_entry_timeout(entry, &outentry); |
261aaba7 | 618 | fuse_dir_changed(dir); |
be12af3e | 619 | err = finish_open(file, entry, generic_file_open); |
30d90494 | 620 | if (err) { |
ebf84d0c KT |
621 | fi = get_fuse_inode(inode); |
622 | fuse_sync_release(fi, ff, flags); | |
c8ccbe03 | 623 | } else { |
267d8444 | 624 | file->private_data = ff; |
c8ccbe03 | 625 | fuse_finish_open(inode, file); |
fd72faac | 626 | } |
d9585277 | 627 | return err; |
fd72faac | 628 | |
c8ccbe03 | 629 | out_free_ff: |
fd72faac | 630 | fuse_file_free(ff); |
c8ccbe03 | 631 | out_put_forget_req: |
07e77dca | 632 | kfree(forget); |
c8ccbe03 | 633 | out_err: |
d9585277 | 634 | return err; |
c8ccbe03 MS |
635 | } |
636 | ||
549c7297 CB |
637 | static int fuse_mknod(struct user_namespace *, struct inode *, struct dentry *, |
638 | umode_t, dev_t); | |
d9585277 | 639 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 640 | struct file *file, unsigned flags, |
44907d79 | 641 | umode_t mode) |
c8ccbe03 MS |
642 | { |
643 | int err; | |
644 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
645 | struct dentry *res = NULL; |
646 | ||
5d069dbe MS |
647 | if (fuse_is_bad(dir)) |
648 | return -EIO; | |
649 | ||
00699ad8 | 650 | if (d_in_lookup(entry)) { |
00cd8dd3 | 651 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 652 | if (IS_ERR(res)) |
d9585277 | 653 | return PTR_ERR(res); |
c8ccbe03 MS |
654 | |
655 | if (res) | |
656 | entry = res; | |
657 | } | |
658 | ||
2b0143b5 | 659 | if (!(flags & O_CREAT) || d_really_is_positive(entry)) |
c8ccbe03 MS |
660 | goto no_open; |
661 | ||
662 | /* Only creates */ | |
73a09dd9 | 663 | file->f_mode |= FMODE_CREATED; |
c8ccbe03 MS |
664 | |
665 | if (fc->no_create) | |
666 | goto mknod; | |
667 | ||
b452a458 | 668 | err = fuse_create_open(dir, entry, file, flags, mode); |
d9585277 | 669 | if (err == -ENOSYS) { |
c8ccbe03 MS |
670 | fc->no_create = 1; |
671 | goto mknod; | |
672 | } | |
673 | out_dput: | |
674 | dput(res); | |
d9585277 | 675 | return err; |
c8ccbe03 MS |
676 | |
677 | mknod: | |
549c7297 | 678 | err = fuse_mknod(&init_user_ns, dir, entry, mode, 0); |
d9585277 | 679 | if (err) |
c8ccbe03 | 680 | goto out_dput; |
c8ccbe03 | 681 | no_open: |
e45198a6 | 682 | return finish_no_open(file, res); |
fd72faac MS |
683 | } |
684 | ||
6f9f1180 MS |
685 | /* |
686 | * Code shared between mknod, mkdir, symlink and link | |
687 | */ | |
fcee216b | 688 | static int create_new_entry(struct fuse_mount *fm, struct fuse_args *args, |
9e6268db | 689 | struct inode *dir, struct dentry *entry, |
541af6a0 | 690 | umode_t mode) |
9e6268db MS |
691 | { |
692 | struct fuse_entry_out outarg; | |
693 | struct inode *inode; | |
c971e6a0 | 694 | struct dentry *d; |
9e6268db | 695 | int err; |
07e77dca | 696 | struct fuse_forget_link *forget; |
3e2b6fdb VG |
697 | void *security_ctx = NULL; |
698 | u32 security_ctxlen; | |
2d51013e | 699 | |
5d069dbe MS |
700 | if (fuse_is_bad(dir)) |
701 | return -EIO; | |
702 | ||
07e77dca | 703 | forget = fuse_alloc_forget(); |
7078187a | 704 | if (!forget) |
07e77dca | 705 | return -ENOMEM; |
9e6268db | 706 | |
0e9663ee | 707 | memset(&outarg, 0, sizeof(outarg)); |
d5b48543 MS |
708 | args->nodeid = get_node_id(dir); |
709 | args->out_numargs = 1; | |
710 | args->out_args[0].size = sizeof(outarg); | |
711 | args->out_args[0].value = &outarg; | |
3e2b6fdb VG |
712 | |
713 | if (fm->fc->init_security && args->opcode != FUSE_LINK) { | |
714 | err = get_security_context(entry, mode, &security_ctx, | |
715 | &security_ctxlen); | |
716 | if (err) | |
717 | goto out_put_forget_req; | |
718 | ||
719 | BUG_ON(args->in_numargs != 2); | |
720 | ||
721 | args->in_numargs = 3; | |
722 | args->in_args[2].size = security_ctxlen; | |
723 | args->in_args[2].value = security_ctx; | |
724 | } | |
725 | ||
fcee216b | 726 | err = fuse_simple_request(fm, args); |
3e2b6fdb | 727 | kfree(security_ctx); |
2d51013e MS |
728 | if (err) |
729 | goto out_put_forget_req; | |
730 | ||
39ee059a | 731 | err = -EIO; |
eb59bd17 | 732 | if (invalid_nodeid(outarg.nodeid) || fuse_invalid_attr(&outarg.attr)) |
2d51013e | 733 | goto out_put_forget_req; |
39ee059a MS |
734 | |
735 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 736 | goto out_put_forget_req; |
39ee059a | 737 | |
9e6268db | 738 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 739 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 740 | if (!inode) { |
fcee216b | 741 | fuse_queue_forget(fm->fc, forget, outarg.nodeid, 1); |
9e6268db MS |
742 | return -ENOMEM; |
743 | } | |
07e77dca | 744 | kfree(forget); |
9e6268db | 745 | |
c971e6a0 AV |
746 | d_drop(entry); |
747 | d = d_splice_alias(inode, entry); | |
748 | if (IS_ERR(d)) | |
749 | return PTR_ERR(d); | |
9e6268db | 750 | |
c971e6a0 AV |
751 | if (d) { |
752 | fuse_change_entry_timeout(d, &outarg); | |
753 | dput(d); | |
754 | } else { | |
755 | fuse_change_entry_timeout(entry, &outarg); | |
756 | } | |
261aaba7 | 757 | fuse_dir_changed(dir); |
9e6268db | 758 | return 0; |
39ee059a | 759 | |
2d51013e | 760 | out_put_forget_req: |
07e77dca | 761 | kfree(forget); |
39ee059a | 762 | return err; |
9e6268db MS |
763 | } |
764 | ||
549c7297 CB |
765 | static int fuse_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
766 | struct dentry *entry, umode_t mode, dev_t rdev) | |
9e6268db MS |
767 | { |
768 | struct fuse_mknod_in inarg; | |
fcee216b | 769 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a | 770 | FUSE_ARGS(args); |
9e6268db | 771 | |
fcee216b | 772 | if (!fm->fc->dont_mask) |
e0a43ddc MS |
773 | mode &= ~current_umask(); |
774 | ||
9e6268db MS |
775 | memset(&inarg, 0, sizeof(inarg)); |
776 | inarg.mode = mode; | |
777 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 778 | inarg.umask = current_umask(); |
d5b48543 MS |
779 | args.opcode = FUSE_MKNOD; |
780 | args.in_numargs = 2; | |
781 | args.in_args[0].size = sizeof(inarg); | |
782 | args.in_args[0].value = &inarg; | |
783 | args.in_args[1].size = entry->d_name.len + 1; | |
784 | args.in_args[1].value = entry->d_name.name; | |
fcee216b | 785 | return create_new_entry(fm, &args, dir, entry, mode); |
9e6268db MS |
786 | } |
787 | ||
549c7297 CB |
788 | static int fuse_create(struct user_namespace *mnt_userns, struct inode *dir, |
789 | struct dentry *entry, umode_t mode, bool excl) | |
9e6268db | 790 | { |
549c7297 | 791 | return fuse_mknod(&init_user_ns, dir, entry, mode, 0); |
9e6268db MS |
792 | } |
793 | ||
549c7297 CB |
794 | static int fuse_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
795 | struct dentry *entry, umode_t mode) | |
9e6268db MS |
796 | { |
797 | struct fuse_mkdir_in inarg; | |
fcee216b | 798 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a | 799 | FUSE_ARGS(args); |
9e6268db | 800 | |
fcee216b | 801 | if (!fm->fc->dont_mask) |
e0a43ddc MS |
802 | mode &= ~current_umask(); |
803 | ||
9e6268db MS |
804 | memset(&inarg, 0, sizeof(inarg)); |
805 | inarg.mode = mode; | |
e0a43ddc | 806 | inarg.umask = current_umask(); |
d5b48543 MS |
807 | args.opcode = FUSE_MKDIR; |
808 | args.in_numargs = 2; | |
809 | args.in_args[0].size = sizeof(inarg); | |
810 | args.in_args[0].value = &inarg; | |
811 | args.in_args[1].size = entry->d_name.len + 1; | |
812 | args.in_args[1].value = entry->d_name.name; | |
fcee216b | 813 | return create_new_entry(fm, &args, dir, entry, S_IFDIR); |
9e6268db MS |
814 | } |
815 | ||
549c7297 CB |
816 | static int fuse_symlink(struct user_namespace *mnt_userns, struct inode *dir, |
817 | struct dentry *entry, const char *link) | |
9e6268db | 818 | { |
fcee216b | 819 | struct fuse_mount *fm = get_fuse_mount(dir); |
9e6268db | 820 | unsigned len = strlen(link) + 1; |
7078187a | 821 | FUSE_ARGS(args); |
9e6268db | 822 | |
d5b48543 MS |
823 | args.opcode = FUSE_SYMLINK; |
824 | args.in_numargs = 2; | |
825 | args.in_args[0].size = entry->d_name.len + 1; | |
826 | args.in_args[0].value = entry->d_name.name; | |
827 | args.in_args[1].size = len; | |
828 | args.in_args[1].value = link; | |
fcee216b | 829 | return create_new_entry(fm, &args, dir, entry, S_IFLNK); |
9e6268db MS |
830 | } |
831 | ||
5c791fe1 MS |
832 | void fuse_flush_time_update(struct inode *inode) |
833 | { | |
834 | int err = sync_inode_metadata(inode, 1); | |
835 | ||
836 | mapping_set_error(inode->i_mapping, err); | |
837 | } | |
838 | ||
97f044f6 | 839 | static void fuse_update_ctime_in_cache(struct inode *inode) |
31f3267b MP |
840 | { |
841 | if (!IS_NOCMTIME(inode)) { | |
c2050a45 | 842 | inode->i_ctime = current_time(inode); |
31f3267b | 843 | mark_inode_dirty_sync(inode); |
5c791fe1 | 844 | fuse_flush_time_update(inode); |
31f3267b MP |
845 | } |
846 | } | |
847 | ||
97f044f6 MS |
848 | void fuse_update_ctime(struct inode *inode) |
849 | { | |
fa5eee57 | 850 | fuse_invalidate_attr_mask(inode, STATX_CTIME); |
97f044f6 MS |
851 | fuse_update_ctime_in_cache(inode); |
852 | } | |
853 | ||
cefd1b83 MS |
854 | static void fuse_entry_unlinked(struct dentry *entry) |
855 | { | |
856 | struct inode *inode = d_inode(entry); | |
857 | struct fuse_conn *fc = get_fuse_conn(inode); | |
858 | struct fuse_inode *fi = get_fuse_inode(inode); | |
859 | ||
860 | spin_lock(&fi->lock); | |
861 | fi->attr_version = atomic64_inc_return(&fc->attr_version); | |
862 | /* | |
863 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
864 | * happen if userspace filesystem is careless. It would be | |
865 | * difficult to enforce correct nlink usage so just ignore this | |
866 | * condition here | |
867 | */ | |
868 | if (S_ISDIR(inode->i_mode)) | |
869 | clear_nlink(inode); | |
870 | else if (inode->i_nlink > 0) | |
871 | drop_nlink(inode); | |
872 | spin_unlock(&fi->lock); | |
873 | fuse_invalidate_entry_cache(entry); | |
874 | fuse_update_ctime(inode); | |
875 | } | |
876 | ||
9e6268db MS |
877 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
878 | { | |
879 | int err; | |
fcee216b | 880 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a MS |
881 | FUSE_ARGS(args); |
882 | ||
5d069dbe MS |
883 | if (fuse_is_bad(dir)) |
884 | return -EIO; | |
885 | ||
d5b48543 MS |
886 | args.opcode = FUSE_UNLINK; |
887 | args.nodeid = get_node_id(dir); | |
888 | args.in_numargs = 1; | |
889 | args.in_args[0].size = entry->d_name.len + 1; | |
890 | args.in_args[0].value = entry->d_name.name; | |
fcee216b | 891 | err = fuse_simple_request(fm, &args); |
9e6268db | 892 | if (!err) { |
261aaba7 | 893 | fuse_dir_changed(dir); |
cefd1b83 | 894 | fuse_entry_unlinked(entry); |
9e6268db MS |
895 | } else if (err == -EINTR) |
896 | fuse_invalidate_entry(entry); | |
897 | return err; | |
898 | } | |
899 | ||
900 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
901 | { | |
902 | int err; | |
fcee216b | 903 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a MS |
904 | FUSE_ARGS(args); |
905 | ||
5d069dbe MS |
906 | if (fuse_is_bad(dir)) |
907 | return -EIO; | |
908 | ||
d5b48543 MS |
909 | args.opcode = FUSE_RMDIR; |
910 | args.nodeid = get_node_id(dir); | |
911 | args.in_numargs = 1; | |
912 | args.in_args[0].size = entry->d_name.len + 1; | |
913 | args.in_args[0].value = entry->d_name.name; | |
fcee216b | 914 | err = fuse_simple_request(fm, &args); |
9e6268db | 915 | if (!err) { |
261aaba7 | 916 | fuse_dir_changed(dir); |
cefd1b83 | 917 | fuse_entry_unlinked(entry); |
9e6268db MS |
918 | } else if (err == -EINTR) |
919 | fuse_invalidate_entry(entry); | |
920 | return err; | |
921 | } | |
922 | ||
1560c974 MS |
923 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
924 | struct inode *newdir, struct dentry *newent, | |
925 | unsigned int flags, int opcode, size_t argsize) | |
9e6268db MS |
926 | { |
927 | int err; | |
1560c974 | 928 | struct fuse_rename2_in inarg; |
fcee216b | 929 | struct fuse_mount *fm = get_fuse_mount(olddir); |
7078187a | 930 | FUSE_ARGS(args); |
9e6268db | 931 | |
1560c974 | 932 | memset(&inarg, 0, argsize); |
9e6268db | 933 | inarg.newdir = get_node_id(newdir); |
1560c974 | 934 | inarg.flags = flags; |
d5b48543 MS |
935 | args.opcode = opcode; |
936 | args.nodeid = get_node_id(olddir); | |
937 | args.in_numargs = 3; | |
938 | args.in_args[0].size = argsize; | |
939 | args.in_args[0].value = &inarg; | |
940 | args.in_args[1].size = oldent->d_name.len + 1; | |
941 | args.in_args[1].value = oldent->d_name.name; | |
942 | args.in_args[2].size = newent->d_name.len + 1; | |
943 | args.in_args[2].value = newent->d_name.name; | |
fcee216b | 944 | err = fuse_simple_request(fm, &args); |
9e6268db | 945 | if (!err) { |
08b63307 | 946 | /* ctime changes */ |
2b0143b5 | 947 | fuse_update_ctime(d_inode(oldent)); |
08b63307 | 948 | |
371e8fd0 | 949 | if (flags & RENAME_EXCHANGE) |
2b0143b5 | 950 | fuse_update_ctime(d_inode(newent)); |
1560c974 | 951 | |
261aaba7 | 952 | fuse_dir_changed(olddir); |
9e6268db | 953 | if (olddir != newdir) |
261aaba7 | 954 | fuse_dir_changed(newdir); |
8cbdf1e6 MS |
955 | |
956 | /* newent will end up negative */ | |
cefd1b83 MS |
957 | if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) |
958 | fuse_entry_unlinked(newent); | |
9e6268db MS |
959 | } else if (err == -EINTR) { |
960 | /* If request was interrupted, DEITY only knows if the | |
961 | rename actually took place. If the invalidation | |
962 | fails (e.g. some process has CWD under the renamed | |
963 | directory), then there can be inconsistency between | |
964 | the dcache and the real filesystem. Tough luck. */ | |
965 | fuse_invalidate_entry(oldent); | |
2b0143b5 | 966 | if (d_really_is_positive(newent)) |
9e6268db MS |
967 | fuse_invalidate_entry(newent); |
968 | } | |
969 | ||
970 | return err; | |
971 | } | |
972 | ||
549c7297 CB |
973 | static int fuse_rename2(struct user_namespace *mnt_userns, struct inode *olddir, |
974 | struct dentry *oldent, struct inode *newdir, | |
975 | struct dentry *newent, unsigned int flags) | |
1560c974 MS |
976 | { |
977 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
978 | int err; | |
979 | ||
5d069dbe MS |
980 | if (fuse_is_bad(olddir)) |
981 | return -EIO; | |
982 | ||
519525fa | 983 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
1560c974 MS |
984 | return -EINVAL; |
985 | ||
4237ba43 MS |
986 | if (flags) { |
987 | if (fc->no_rename2 || fc->minor < 23) | |
988 | return -EINVAL; | |
1560c974 | 989 | |
4237ba43 MS |
990 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, |
991 | FUSE_RENAME2, | |
992 | sizeof(struct fuse_rename2_in)); | |
993 | if (err == -ENOSYS) { | |
994 | fc->no_rename2 = 1; | |
995 | err = -EINVAL; | |
996 | } | |
997 | } else { | |
998 | err = fuse_rename_common(olddir, oldent, newdir, newent, 0, | |
999 | FUSE_RENAME, | |
1000 | sizeof(struct fuse_rename_in)); | |
1560c974 | 1001 | } |
4237ba43 | 1002 | |
1560c974 | 1003 | return err; |
4237ba43 | 1004 | } |
1560c974 | 1005 | |
9e6268db MS |
1006 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
1007 | struct dentry *newent) | |
1008 | { | |
1009 | int err; | |
1010 | struct fuse_link_in inarg; | |
2b0143b5 | 1011 | struct inode *inode = d_inode(entry); |
fcee216b | 1012 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1013 | FUSE_ARGS(args); |
9e6268db MS |
1014 | |
1015 | memset(&inarg, 0, sizeof(inarg)); | |
1016 | inarg.oldnodeid = get_node_id(inode); | |
d5b48543 MS |
1017 | args.opcode = FUSE_LINK; |
1018 | args.in_numargs = 2; | |
1019 | args.in_args[0].size = sizeof(inarg); | |
1020 | args.in_args[0].value = &inarg; | |
1021 | args.in_args[1].size = newent->d_name.len + 1; | |
1022 | args.in_args[1].value = newent->d_name.name; | |
fcee216b | 1023 | err = create_new_entry(fm, &args, newdir, newent, inode->i_mode); |
97f044f6 MS |
1024 | if (!err) |
1025 | fuse_update_ctime_in_cache(inode); | |
1026 | else if (err == -EINTR) | |
ac45d613 | 1027 | fuse_invalidate_attr(inode); |
97f044f6 | 1028 | |
9e6268db MS |
1029 | return err; |
1030 | } | |
1031 | ||
1fb69e78 MS |
1032 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
1033 | struct kstat *stat) | |
1034 | { | |
203627bb | 1035 | unsigned int blkbits; |
8373200b PE |
1036 | struct fuse_conn *fc = get_fuse_conn(inode); |
1037 | ||
1fb69e78 MS |
1038 | stat->dev = inode->i_sb->s_dev; |
1039 | stat->ino = attr->ino; | |
1040 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
1041 | stat->nlink = attr->nlink; | |
8cb08329 EB |
1042 | stat->uid = make_kuid(fc->user_ns, attr->uid); |
1043 | stat->gid = make_kgid(fc->user_ns, attr->gid); | |
1fb69e78 MS |
1044 | stat->rdev = inode->i_rdev; |
1045 | stat->atime.tv_sec = attr->atime; | |
1046 | stat->atime.tv_nsec = attr->atimensec; | |
1047 | stat->mtime.tv_sec = attr->mtime; | |
1048 | stat->mtime.tv_nsec = attr->mtimensec; | |
1049 | stat->ctime.tv_sec = attr->ctime; | |
1050 | stat->ctime.tv_nsec = attr->ctimensec; | |
1051 | stat->size = attr->size; | |
1052 | stat->blocks = attr->blocks; | |
203627bb MS |
1053 | |
1054 | if (attr->blksize != 0) | |
1055 | blkbits = ilog2(attr->blksize); | |
1056 | else | |
1057 | blkbits = inode->i_sb->s_blocksize_bits; | |
1058 | ||
1059 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
1060 | } |
1061 | ||
c79e322f MS |
1062 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
1063 | struct file *file) | |
e5e5558e MS |
1064 | { |
1065 | int err; | |
c79e322f MS |
1066 | struct fuse_getattr_in inarg; |
1067 | struct fuse_attr_out outarg; | |
fcee216b | 1068 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1069 | FUSE_ARGS(args); |
1fb69e78 MS |
1070 | u64 attr_version; |
1071 | ||
fcee216b | 1072 | attr_version = fuse_get_attr_version(fm->fc); |
1fb69e78 | 1073 | |
c79e322f | 1074 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1075 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
1076 | /* Directories have separate file-handle space */ |
1077 | if (file && S_ISREG(inode->i_mode)) { | |
1078 | struct fuse_file *ff = file->private_data; | |
1079 | ||
1080 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
1081 | inarg.fh = ff->fh; | |
1082 | } | |
d5b48543 MS |
1083 | args.opcode = FUSE_GETATTR; |
1084 | args.nodeid = get_node_id(inode); | |
1085 | args.in_numargs = 1; | |
1086 | args.in_args[0].size = sizeof(inarg); | |
1087 | args.in_args[0].value = &inarg; | |
1088 | args.out_numargs = 1; | |
1089 | args.out_args[0].size = sizeof(outarg); | |
1090 | args.out_args[0].value = &outarg; | |
fcee216b | 1091 | err = fuse_simple_request(fm, &args); |
e5e5558e | 1092 | if (!err) { |
eb59bd17 | 1093 | if (fuse_invalid_attr(&outarg.attr) || |
6e3e2c43 | 1094 | inode_wrong_type(inode, outarg.attr.mode)) { |
5d069dbe | 1095 | fuse_make_bad(inode); |
e5e5558e MS |
1096 | err = -EIO; |
1097 | } else { | |
c79e322f MS |
1098 | fuse_change_attributes(inode, &outarg.attr, |
1099 | attr_timeout(&outarg), | |
1fb69e78 MS |
1100 | attr_version); |
1101 | if (stat) | |
c79e322f | 1102 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
1103 | } |
1104 | } | |
1105 | return err; | |
1106 | } | |
1107 | ||
5b97eeac | 1108 | static int fuse_update_get_attr(struct inode *inode, struct file *file, |
2f1e8196 MS |
1109 | struct kstat *stat, u32 request_mask, |
1110 | unsigned int flags) | |
bcb4be80 MS |
1111 | { |
1112 | struct fuse_inode *fi = get_fuse_inode(inode); | |
5b97eeac | 1113 | int err = 0; |
bf5c1898 | 1114 | bool sync; |
ec855375 MS |
1115 | u32 inval_mask = READ_ONCE(fi->inval_mask); |
1116 | u32 cache_mask = fuse_get_cache_mask(inode); | |
bcb4be80 | 1117 | |
bf5c1898 MS |
1118 | if (flags & AT_STATX_FORCE_SYNC) |
1119 | sync = true; | |
1120 | else if (flags & AT_STATX_DONT_SYNC) | |
1121 | sync = false; | |
ec855375 | 1122 | else if (request_mask & inval_mask & ~cache_mask) |
2f1e8196 | 1123 | sync = true; |
bf5c1898 MS |
1124 | else |
1125 | sync = time_before64(fi->i_time, get_jiffies_64()); | |
1126 | ||
1127 | if (sync) { | |
60bcc88a | 1128 | forget_all_cached_acls(inode); |
bcb4be80 | 1129 | err = fuse_do_getattr(inode, stat, file); |
5b97eeac | 1130 | } else if (stat) { |
0d56a451 | 1131 | generic_fillattr(&init_user_ns, inode, stat); |
5b97eeac MS |
1132 | stat->mode = fi->orig_i_mode; |
1133 | stat->ino = fi->orig_ino; | |
bcb4be80 MS |
1134 | } |
1135 | ||
bcb4be80 MS |
1136 | return err; |
1137 | } | |
1138 | ||
c6c745b8 | 1139 | int fuse_update_attributes(struct inode *inode, struct file *file, u32 mask) |
5b97eeac | 1140 | { |
c6c745b8 | 1141 | return fuse_update_get_attr(inode, file, NULL, mask, 0); |
5b97eeac MS |
1142 | } |
1143 | ||
fcee216b | 1144 | int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid, |
451d0f59 | 1145 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
1146 | { |
1147 | int err = -ENOTDIR; | |
1148 | struct inode *parent; | |
1149 | struct dentry *dir; | |
1150 | struct dentry *entry; | |
1151 | ||
fcee216b | 1152 | parent = fuse_ilookup(fc, parent_nodeid, NULL); |
3b463ae0 JM |
1153 | if (!parent) |
1154 | return -ENOENT; | |
1155 | ||
bda9a719 | 1156 | inode_lock_nested(parent, I_MUTEX_PARENT); |
3b463ae0 JM |
1157 | if (!S_ISDIR(parent->i_mode)) |
1158 | goto unlock; | |
1159 | ||
1160 | err = -ENOENT; | |
1161 | dir = d_find_alias(parent); | |
1162 | if (!dir) | |
1163 | goto unlock; | |
1164 | ||
8387ff25 | 1165 | name->hash = full_name_hash(dir, name->name, name->len); |
3b463ae0 JM |
1166 | entry = d_lookup(dir, name); |
1167 | dput(dir); | |
1168 | if (!entry) | |
1169 | goto unlock; | |
1170 | ||
261aaba7 | 1171 | fuse_dir_changed(parent); |
3b463ae0 | 1172 | fuse_invalidate_entry(entry); |
451d0f59 | 1173 | |
2b0143b5 | 1174 | if (child_nodeid != 0 && d_really_is_positive(entry)) { |
5955102c | 1175 | inode_lock(d_inode(entry)); |
2b0143b5 | 1176 | if (get_node_id(d_inode(entry)) != child_nodeid) { |
451d0f59 JM |
1177 | err = -ENOENT; |
1178 | goto badentry; | |
1179 | } | |
1180 | if (d_mountpoint(entry)) { | |
1181 | err = -EBUSY; | |
1182 | goto badentry; | |
1183 | } | |
e36cb0b8 | 1184 | if (d_is_dir(entry)) { |
451d0f59 JM |
1185 | shrink_dcache_parent(entry); |
1186 | if (!simple_empty(entry)) { | |
1187 | err = -ENOTEMPTY; | |
1188 | goto badentry; | |
1189 | } | |
2b0143b5 | 1190 | d_inode(entry)->i_flags |= S_DEAD; |
451d0f59 JM |
1191 | } |
1192 | dont_mount(entry); | |
2b0143b5 | 1193 | clear_nlink(d_inode(entry)); |
451d0f59 JM |
1194 | err = 0; |
1195 | badentry: | |
5955102c | 1196 | inode_unlock(d_inode(entry)); |
451d0f59 JM |
1197 | if (!err) |
1198 | d_delete(entry); | |
1199 | } else { | |
1200 | err = 0; | |
1201 | } | |
3b463ae0 | 1202 | dput(entry); |
3b463ae0 JM |
1203 | |
1204 | unlock: | |
5955102c | 1205 | inode_unlock(parent); |
3b463ae0 JM |
1206 | iput(parent); |
1207 | return err; | |
1208 | } | |
1209 | ||
87729a55 MS |
1210 | /* |
1211 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1212 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1213 | * means, that the filesystem daemon is able to record the exact |
1214 | * filesystem operations performed, and can also control the behavior | |
1215 | * of the requester process in otherwise impossible ways. For example | |
1216 | * it can delay the operation for arbitrary length of time allowing | |
1217 | * DoS against the requester. | |
1218 | * | |
1219 | * For this reason only those processes can call into the filesystem, | |
1220 | * for which the owner of the mount has ptrace privilege. This | |
1221 | * excludes processes started by other users, suid or sgid processes. | |
1222 | */ | |
c2132c1b | 1223 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1224 | { |
c69e8d9c | 1225 | const struct cred *cred; |
87729a55 | 1226 | |
29433a29 | 1227 | if (fc->allow_other) |
73f03c2b | 1228 | return current_in_userns(fc->user_ns); |
87729a55 | 1229 | |
c2132c1b | 1230 | cred = current_cred(); |
499dcf20 EB |
1231 | if (uid_eq(cred->euid, fc->user_id) && |
1232 | uid_eq(cred->suid, fc->user_id) && | |
1233 | uid_eq(cred->uid, fc->user_id) && | |
1234 | gid_eq(cred->egid, fc->group_id) && | |
1235 | gid_eq(cred->sgid, fc->group_id) && | |
1236 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1237 | return 1; |
c69e8d9c | 1238 | |
c2132c1b | 1239 | return 0; |
87729a55 MS |
1240 | } |
1241 | ||
31d40d74 MS |
1242 | static int fuse_access(struct inode *inode, int mask) |
1243 | { | |
fcee216b | 1244 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1245 | FUSE_ARGS(args); |
31d40d74 MS |
1246 | struct fuse_access_in inarg; |
1247 | int err; | |
1248 | ||
698fa1d1 MS |
1249 | BUG_ON(mask & MAY_NOT_BLOCK); |
1250 | ||
fcee216b | 1251 | if (fm->fc->no_access) |
31d40d74 MS |
1252 | return 0; |
1253 | ||
31d40d74 | 1254 | memset(&inarg, 0, sizeof(inarg)); |
e6305c43 | 1255 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
d5b48543 MS |
1256 | args.opcode = FUSE_ACCESS; |
1257 | args.nodeid = get_node_id(inode); | |
1258 | args.in_numargs = 1; | |
1259 | args.in_args[0].size = sizeof(inarg); | |
1260 | args.in_args[0].value = &inarg; | |
fcee216b | 1261 | err = fuse_simple_request(fm, &args); |
31d40d74 | 1262 | if (err == -ENOSYS) { |
fcee216b | 1263 | fm->fc->no_access = 1; |
31d40d74 MS |
1264 | err = 0; |
1265 | } | |
1266 | return err; | |
1267 | } | |
1268 | ||
10556cb2 | 1269 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1270 | { |
10556cb2 | 1271 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1272 | return -ECHILD; |
1273 | ||
60bcc88a | 1274 | forget_all_cached_acls(inode); |
19690ddb MS |
1275 | return fuse_do_getattr(inode, NULL, NULL); |
1276 | } | |
1277 | ||
6f9f1180 MS |
1278 | /* |
1279 | * Check permission. The two basic access models of FUSE are: | |
1280 | * | |
1281 | * 1) Local access checking ('default_permissions' mount option) based | |
1282 | * on file mode. This is the plain old disk filesystem permission | |
1283 | * modell. | |
1284 | * | |
1285 | * 2) "Remote" access checking, where server is responsible for | |
1286 | * checking permission in each inode operation. An exception to this | |
1287 | * is if ->permission() was invoked from sys_access() in which case an | |
1288 | * access request is sent. Execute permission is still checked | |
1289 | * locally based on file mode. | |
1290 | */ | |
549c7297 CB |
1291 | static int fuse_permission(struct user_namespace *mnt_userns, |
1292 | struct inode *inode, int mask) | |
e5e5558e MS |
1293 | { |
1294 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1295 | bool refreshed = false; |
1296 | int err = 0; | |
e5e5558e | 1297 | |
5d069dbe MS |
1298 | if (fuse_is_bad(inode)) |
1299 | return -EIO; | |
1300 | ||
c2132c1b | 1301 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1302 | return -EACCES; |
244f6385 MS |
1303 | |
1304 | /* | |
e8e96157 | 1305 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1306 | */ |
29433a29 | 1307 | if (fc->default_permissions || |
e8e96157 | 1308 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { |
19690ddb | 1309 | struct fuse_inode *fi = get_fuse_inode(inode); |
d233c7dd | 1310 | u32 perm_mask = STATX_MODE | STATX_UID | STATX_GID; |
19690ddb | 1311 | |
d233c7dd MS |
1312 | if (perm_mask & READ_ONCE(fi->inval_mask) || |
1313 | time_before64(fi->i_time, get_jiffies_64())) { | |
19690ddb MS |
1314 | refreshed = true; |
1315 | ||
10556cb2 | 1316 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1317 | if (err) |
1318 | return err; | |
1319 | } | |
244f6385 MS |
1320 | } |
1321 | ||
29433a29 | 1322 | if (fc->default_permissions) { |
47291baa | 1323 | err = generic_permission(&init_user_ns, inode, mask); |
1e9a4ed9 MS |
1324 | |
1325 | /* If permission is denied, try to refresh file | |
1326 | attributes. This is also needed, because the root | |
1327 | node will at first have no permissions */ | |
244f6385 | 1328 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1329 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1330 | if (!err) |
47291baa CB |
1331 | err = generic_permission(&init_user_ns, |
1332 | inode, mask); | |
1e9a4ed9 MS |
1333 | } |
1334 | ||
6f9f1180 MS |
1335 | /* Note: the opposite of the above test does not |
1336 | exist. So if permissions are revoked this won't be | |
1337 | noticed immediately, only after the attribute | |
1338 | timeout has expired */ | |
9cfcac81 | 1339 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1340 | err = fuse_access(inode, mask); |
1341 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1342 | if (!(inode->i_mode & S_IXUGO)) { | |
1343 | if (refreshed) | |
1344 | return -EACCES; | |
1345 | ||
10556cb2 | 1346 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1347 | if (!err && !(inode->i_mode & S_IXUGO)) |
1348 | return -EACCES; | |
1349 | } | |
e5e5558e | 1350 | } |
244f6385 | 1351 | return err; |
e5e5558e MS |
1352 | } |
1353 | ||
5571f1e6 | 1354 | static int fuse_readlink_page(struct inode *inode, struct page *page) |
e5e5558e | 1355 | { |
fcee216b | 1356 | struct fuse_mount *fm = get_fuse_mount(inode); |
4c29afec MS |
1357 | struct fuse_page_desc desc = { .length = PAGE_SIZE - 1 }; |
1358 | struct fuse_args_pages ap = { | |
1359 | .num_pages = 1, | |
1360 | .pages = &page, | |
1361 | .descs = &desc, | |
1362 | }; | |
1363 | char *link; | |
1364 | ssize_t res; | |
1365 | ||
1366 | ap.args.opcode = FUSE_READLINK; | |
1367 | ap.args.nodeid = get_node_id(inode); | |
1368 | ap.args.out_pages = true; | |
1369 | ap.args.out_argvar = true; | |
1370 | ap.args.page_zeroing = true; | |
1371 | ap.args.out_numargs = 1; | |
1372 | ap.args.out_args[0].size = desc.length; | |
fcee216b | 1373 | res = fuse_simple_request(fm, &ap.args); |
e5e5558e | 1374 | |
4c29afec | 1375 | fuse_invalidate_atime(inode); |
6b255391 | 1376 | |
4c29afec MS |
1377 | if (res < 0) |
1378 | return res; | |
7078187a | 1379 | |
4c29afec MS |
1380 | if (WARN_ON(res >= PAGE_SIZE)) |
1381 | return -EIO; | |
5571f1e6 | 1382 | |
4c29afec MS |
1383 | link = page_address(page); |
1384 | link[res] = '\0'; | |
5571f1e6 | 1385 | |
4c29afec | 1386 | return 0; |
5571f1e6 DS |
1387 | } |
1388 | ||
1389 | static const char *fuse_get_link(struct dentry *dentry, struct inode *inode, | |
1390 | struct delayed_call *callback) | |
1391 | { | |
1392 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1393 | struct page *page; | |
1394 | int err; | |
1395 | ||
1396 | err = -EIO; | |
5d069dbe | 1397 | if (fuse_is_bad(inode)) |
5571f1e6 DS |
1398 | goto out_err; |
1399 | ||
1400 | if (fc->cache_symlinks) | |
1401 | return page_get_link(dentry, inode, callback); | |
1402 | ||
1403 | err = -ECHILD; | |
1404 | if (!dentry) | |
1405 | goto out_err; | |
1406 | ||
1407 | page = alloc_page(GFP_KERNEL); | |
1408 | err = -ENOMEM; | |
1409 | if (!page) | |
1410 | goto out_err; | |
1411 | ||
1412 | err = fuse_readlink_page(inode, page); | |
1413 | if (err) { | |
1414 | __free_page(page); | |
1415 | goto out_err; | |
1416 | } | |
1417 | ||
1418 | set_delayed_call(callback, page_put_link, page); | |
1419 | ||
1420 | return page_address(page); | |
1421 | ||
1422 | out_err: | |
1423 | return ERR_PTR(err); | |
e5e5558e MS |
1424 | } |
1425 | ||
e5e5558e MS |
1426 | static int fuse_dir_open(struct inode *inode, struct file *file) |
1427 | { | |
91fe96b4 | 1428 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1429 | } |
1430 | ||
1431 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1432 | { | |
2e64ff15 | 1433 | fuse_release_common(file, true); |
8b0797a4 MS |
1434 | |
1435 | return 0; | |
e5e5558e MS |
1436 | } |
1437 | ||
02c24a82 JB |
1438 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1439 | int datasync) | |
82547981 | 1440 | { |
a9c2d1e8 MS |
1441 | struct inode *inode = file->f_mapping->host; |
1442 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1443 | int err; | |
1444 | ||
5d069dbe | 1445 | if (fuse_is_bad(inode)) |
a9c2d1e8 MS |
1446 | return -EIO; |
1447 | ||
1448 | if (fc->no_fsyncdir) | |
1449 | return 0; | |
1450 | ||
1451 | inode_lock(inode); | |
1452 | err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNCDIR); | |
1453 | if (err == -ENOSYS) { | |
1454 | fc->no_fsyncdir = 1; | |
1455 | err = 0; | |
1456 | } | |
1457 | inode_unlock(inode); | |
1458 | ||
1459 | return err; | |
82547981 MS |
1460 | } |
1461 | ||
b18da0c5 MS |
1462 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1463 | unsigned long arg) | |
1464 | { | |
1465 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1466 | ||
1467 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1468 | if (fc->minor < 18) | |
1469 | return -ENOTTY; | |
1470 | ||
1471 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1472 | } | |
1473 | ||
1474 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1475 | unsigned long arg) | |
1476 | { | |
1477 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1478 | ||
1479 | if (fc->minor < 18) | |
1480 | return -ENOTTY; | |
1481 | ||
1482 | return fuse_ioctl_common(file, cmd, arg, | |
1483 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1484 | } | |
1485 | ||
b0aa7606 | 1486 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
17637cba MS |
1487 | { |
1488 | /* Always update if mtime is explicitly set */ | |
1489 | if (ivalid & ATTR_MTIME_SET) | |
1490 | return true; | |
1491 | ||
b0aa7606 MP |
1492 | /* Or if kernel i_mtime is the official one */ |
1493 | if (trust_local_mtime) | |
1494 | return true; | |
1495 | ||
17637cba MS |
1496 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
1497 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1498 | return false; | |
1499 | ||
1500 | /* In all other cases update */ | |
1501 | return true; | |
1502 | } | |
1503 | ||
8cb08329 EB |
1504 | static void iattr_to_fattr(struct fuse_conn *fc, struct iattr *iattr, |
1505 | struct fuse_setattr_in *arg, bool trust_local_cmtime) | |
9e6268db MS |
1506 | { |
1507 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1508 | |
1509 | if (ivalid & ATTR_MODE) | |
befc649c | 1510 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1511 | if (ivalid & ATTR_UID) |
8cb08329 | 1512 | arg->valid |= FATTR_UID, arg->uid = from_kuid(fc->user_ns, iattr->ia_uid); |
9e6268db | 1513 | if (ivalid & ATTR_GID) |
8cb08329 | 1514 | arg->valid |= FATTR_GID, arg->gid = from_kgid(fc->user_ns, iattr->ia_gid); |
9e6268db | 1515 | if (ivalid & ATTR_SIZE) |
befc649c | 1516 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1517 | if (ivalid & ATTR_ATIME) { |
1518 | arg->valid |= FATTR_ATIME; | |
befc649c | 1519 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1520 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1521 | if (!(ivalid & ATTR_ATIME_SET)) | |
1522 | arg->valid |= FATTR_ATIME_NOW; | |
1523 | } | |
3ad22c62 | 1524 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
17637cba | 1525 | arg->valid |= FATTR_MTIME; |
befc649c | 1526 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba | 1527 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
3ad22c62 | 1528 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
17637cba | 1529 | arg->valid |= FATTR_MTIME_NOW; |
befc649c | 1530 | } |
3ad22c62 MP |
1531 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
1532 | arg->valid |= FATTR_CTIME; | |
1533 | arg->ctime = iattr->ia_ctime.tv_sec; | |
1534 | arg->ctimensec = iattr->ia_ctime.tv_nsec; | |
1535 | } | |
9e6268db MS |
1536 | } |
1537 | ||
3be5a52b MS |
1538 | /* |
1539 | * Prevent concurrent writepages on inode | |
1540 | * | |
1541 | * This is done by adding a negative bias to the inode write counter | |
1542 | * and waiting for all pending writes to finish. | |
1543 | */ | |
1544 | void fuse_set_nowrite(struct inode *inode) | |
1545 | { | |
3be5a52b MS |
1546 | struct fuse_inode *fi = get_fuse_inode(inode); |
1547 | ||
5955102c | 1548 | BUG_ON(!inode_is_locked(inode)); |
3be5a52b | 1549 | |
f15ecfef | 1550 | spin_lock(&fi->lock); |
3be5a52b MS |
1551 | BUG_ON(fi->writectr < 0); |
1552 | fi->writectr += FUSE_NOWRITE; | |
f15ecfef | 1553 | spin_unlock(&fi->lock); |
3be5a52b MS |
1554 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); |
1555 | } | |
1556 | ||
1557 | /* | |
1558 | * Allow writepages on inode | |
1559 | * | |
1560 | * Remove the bias from the writecounter and send any queued | |
1561 | * writepages. | |
1562 | */ | |
1563 | static void __fuse_release_nowrite(struct inode *inode) | |
1564 | { | |
1565 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1566 | ||
1567 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1568 | fi->writectr = 0; | |
1569 | fuse_flush_writepages(inode); | |
1570 | } | |
1571 | ||
1572 | void fuse_release_nowrite(struct inode *inode) | |
1573 | { | |
f15ecfef | 1574 | struct fuse_inode *fi = get_fuse_inode(inode); |
3be5a52b | 1575 | |
f15ecfef | 1576 | spin_lock(&fi->lock); |
3be5a52b | 1577 | __fuse_release_nowrite(inode); |
f15ecfef | 1578 | spin_unlock(&fi->lock); |
3be5a52b MS |
1579 | } |
1580 | ||
7078187a | 1581 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args, |
b0aa7606 MP |
1582 | struct inode *inode, |
1583 | struct fuse_setattr_in *inarg_p, | |
1584 | struct fuse_attr_out *outarg_p) | |
1585 | { | |
d5b48543 MS |
1586 | args->opcode = FUSE_SETATTR; |
1587 | args->nodeid = get_node_id(inode); | |
1588 | args->in_numargs = 1; | |
1589 | args->in_args[0].size = sizeof(*inarg_p); | |
1590 | args->in_args[0].value = inarg_p; | |
1591 | args->out_numargs = 1; | |
1592 | args->out_args[0].size = sizeof(*outarg_p); | |
1593 | args->out_args[0].value = outarg_p; | |
b0aa7606 MP |
1594 | } |
1595 | ||
1596 | /* | |
1597 | * Flush inode->i_mtime to the server | |
1598 | */ | |
ab9e13f7 | 1599 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
b0aa7606 | 1600 | { |
fcee216b | 1601 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1602 | FUSE_ARGS(args); |
b0aa7606 MP |
1603 | struct fuse_setattr_in inarg; |
1604 | struct fuse_attr_out outarg; | |
b0aa7606 MP |
1605 | |
1606 | memset(&inarg, 0, sizeof(inarg)); | |
1607 | memset(&outarg, 0, sizeof(outarg)); | |
1608 | ||
ab9e13f7 | 1609 | inarg.valid = FATTR_MTIME; |
b0aa7606 MP |
1610 | inarg.mtime = inode->i_mtime.tv_sec; |
1611 | inarg.mtimensec = inode->i_mtime.tv_nsec; | |
fcee216b | 1612 | if (fm->fc->minor >= 23) { |
ab9e13f7 MP |
1613 | inarg.valid |= FATTR_CTIME; |
1614 | inarg.ctime = inode->i_ctime.tv_sec; | |
1615 | inarg.ctimensec = inode->i_ctime.tv_nsec; | |
1616 | } | |
1e18bda8 MS |
1617 | if (ff) { |
1618 | inarg.valid |= FATTR_FH; | |
1619 | inarg.fh = ff->fh; | |
1620 | } | |
fcee216b | 1621 | fuse_setattr_fill(fm->fc, &args, inode, &inarg, &outarg); |
b0aa7606 | 1622 | |
fcee216b | 1623 | return fuse_simple_request(fm, &args); |
b0aa7606 MP |
1624 | } |
1625 | ||
6f9f1180 MS |
1626 | /* |
1627 | * Set attributes, and at the same time refresh them. | |
1628 | * | |
1629 | * Truncation is slightly complicated, because the 'truncate' request | |
1630 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1631 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1632 | * and the actual truncation by hand. | |
6f9f1180 | 1633 | */ |
62490330 | 1634 | int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, |
efb9fa9e | 1635 | struct file *file) |
9e6268db | 1636 | { |
62490330 | 1637 | struct inode *inode = d_inode(dentry); |
fcee216b MR |
1638 | struct fuse_mount *fm = get_fuse_mount(inode); |
1639 | struct fuse_conn *fc = fm->fc; | |
06a7c3c2 | 1640 | struct fuse_inode *fi = get_fuse_inode(inode); |
8bcbbe9c | 1641 | struct address_space *mapping = inode->i_mapping; |
7078187a | 1642 | FUSE_ARGS(args); |
9e6268db MS |
1643 | struct fuse_setattr_in inarg; |
1644 | struct fuse_attr_out outarg; | |
3be5a52b | 1645 | bool is_truncate = false; |
c15016b7 | 1646 | bool is_wb = fc->writeback_cache && S_ISREG(inode->i_mode); |
3be5a52b | 1647 | loff_t oldsize; |
9e6268db | 1648 | int err; |
c15016b7 | 1649 | bool trust_local_cmtime = is_wb; |
6ae330ca | 1650 | bool fault_blocked = false; |
9e6268db | 1651 | |
29433a29 | 1652 | if (!fc->default_permissions) |
db78b877 CH |
1653 | attr->ia_valid |= ATTR_FORCE; |
1654 | ||
2f221d6f | 1655 | err = setattr_prepare(&init_user_ns, dentry, attr); |
db78b877 CH |
1656 | if (err) |
1657 | return err; | |
1e9a4ed9 | 1658 | |
6ae330ca VG |
1659 | if (attr->ia_valid & ATTR_SIZE) { |
1660 | if (WARN_ON(!S_ISREG(inode->i_mode))) | |
1661 | return -EIO; | |
1662 | is_truncate = true; | |
1663 | } | |
1664 | ||
1665 | if (FUSE_IS_DAX(inode) && is_truncate) { | |
8bcbbe9c | 1666 | filemap_invalidate_lock(mapping); |
6ae330ca VG |
1667 | fault_blocked = true; |
1668 | err = fuse_dax_break_layouts(inode, 0, 0); | |
1669 | if (err) { | |
8bcbbe9c | 1670 | filemap_invalidate_unlock(mapping); |
6ae330ca VG |
1671 | return err; |
1672 | } | |
1673 | } | |
1674 | ||
8d56addd | 1675 | if (attr->ia_valid & ATTR_OPEN) { |
df0e91d4 MS |
1676 | /* This is coming from open(..., ... | O_TRUNC); */ |
1677 | WARN_ON(!(attr->ia_valid & ATTR_SIZE)); | |
1678 | WARN_ON(attr->ia_size != 0); | |
1679 | if (fc->atomic_o_trunc) { | |
1680 | /* | |
1681 | * No need to send request to userspace, since actual | |
1682 | * truncation has already been done by OPEN. But still | |
1683 | * need to truncate page cache. | |
1684 | */ | |
1685 | i_size_write(inode, 0); | |
1686 | truncate_pagecache(inode, 0); | |
6ae330ca | 1687 | goto out; |
df0e91d4 | 1688 | } |
8d56addd MS |
1689 | file = NULL; |
1690 | } | |
6ff958ed | 1691 | |
b24e7598 | 1692 | /* Flush dirty data/metadata before non-truncate SETATTR */ |
c15016b7 | 1693 | if (is_wb && |
b24e7598 MS |
1694 | attr->ia_valid & |
1695 | (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_MTIME_SET | | |
1696 | ATTR_TIMES_SET)) { | |
1697 | err = write_inode_now(inode, true); | |
1698 | if (err) | |
1699 | return err; | |
1700 | ||
1701 | fuse_set_nowrite(inode); | |
1702 | fuse_release_nowrite(inode); | |
1703 | } | |
1704 | ||
06a7c3c2 | 1705 | if (is_truncate) { |
3be5a52b | 1706 | fuse_set_nowrite(inode); |
06a7c3c2 | 1707 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3ad22c62 MP |
1708 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
1709 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; | |
06a7c3c2 | 1710 | } |
3be5a52b | 1711 | |
9e6268db | 1712 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1713 | memset(&outarg, 0, sizeof(outarg)); |
8cb08329 | 1714 | iattr_to_fattr(fc, attr, &inarg, trust_local_cmtime); |
49d4914f MS |
1715 | if (file) { |
1716 | struct fuse_file *ff = file->private_data; | |
1717 | inarg.valid |= FATTR_FH; | |
1718 | inarg.fh = ff->fh; | |
1719 | } | |
31792161 VG |
1720 | |
1721 | /* Kill suid/sgid for non-directory chown unconditionally */ | |
1722 | if (fc->handle_killpriv_v2 && !S_ISDIR(inode->i_mode) && | |
1723 | attr->ia_valid & (ATTR_UID | ATTR_GID)) | |
1724 | inarg.valid |= FATTR_KILL_SUIDGID; | |
1725 | ||
f3332114 MS |
1726 | if (attr->ia_valid & ATTR_SIZE) { |
1727 | /* For mandatory locking in truncate */ | |
1728 | inarg.valid |= FATTR_LOCKOWNER; | |
1729 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
31792161 VG |
1730 | |
1731 | /* Kill suid/sgid for truncate only if no CAP_FSETID */ | |
1732 | if (fc->handle_killpriv_v2 && !capable(CAP_FSETID)) | |
1733 | inarg.valid |= FATTR_KILL_SUIDGID; | |
f3332114 | 1734 | } |
7078187a | 1735 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
fcee216b | 1736 | err = fuse_simple_request(fm, &args); |
e00d2c2d MS |
1737 | if (err) { |
1738 | if (err == -EINTR) | |
1739 | fuse_invalidate_attr(inode); | |
3be5a52b | 1740 | goto error; |
e00d2c2d | 1741 | } |
9e6268db | 1742 | |
eb59bd17 | 1743 | if (fuse_invalid_attr(&outarg.attr) || |
6e3e2c43 | 1744 | inode_wrong_type(inode, outarg.attr.mode)) { |
5d069dbe | 1745 | fuse_make_bad(inode); |
3be5a52b MS |
1746 | err = -EIO; |
1747 | goto error; | |
1748 | } | |
1749 | ||
f15ecfef | 1750 | spin_lock(&fi->lock); |
b0aa7606 | 1751 | /* the kernel maintains i_mtime locally */ |
3ad22c62 MP |
1752 | if (trust_local_cmtime) { |
1753 | if (attr->ia_valid & ATTR_MTIME) | |
1754 | inode->i_mtime = attr->ia_mtime; | |
1755 | if (attr->ia_valid & ATTR_CTIME) | |
1756 | inode->i_ctime = attr->ia_ctime; | |
1e18bda8 | 1757 | /* FIXME: clear I_DIRTY_SYNC? */ |
b0aa7606 MP |
1758 | } |
1759 | ||
3be5a52b | 1760 | fuse_change_attributes_common(inode, &outarg.attr, |
4b52f059 MS |
1761 | attr_timeout(&outarg), |
1762 | fuse_get_cache_mask(inode)); | |
3be5a52b | 1763 | oldsize = inode->i_size; |
8373200b | 1764 | /* see the comment in fuse_change_attributes() */ |
c15016b7 | 1765 | if (!is_wb || is_truncate) |
8373200b | 1766 | i_size_write(inode, outarg.attr.size); |
3be5a52b MS |
1767 | |
1768 | if (is_truncate) { | |
f15ecfef | 1769 | /* NOTE: this may release/reacquire fi->lock */ |
3be5a52b MS |
1770 | __fuse_release_nowrite(inode); |
1771 | } | |
f15ecfef | 1772 | spin_unlock(&fi->lock); |
3be5a52b MS |
1773 | |
1774 | /* | |
1775 | * Only call invalidate_inode_pages2() after removing | |
1776 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1777 | */ | |
8373200b PE |
1778 | if ((is_truncate || !is_wb) && |
1779 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1780 | truncate_pagecache(inode, outarg.attr.size); |
8bcbbe9c | 1781 | invalidate_inode_pages2(mapping); |
e00d2c2d MS |
1782 | } |
1783 | ||
06a7c3c2 | 1784 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
6ae330ca VG |
1785 | out: |
1786 | if (fault_blocked) | |
8bcbbe9c | 1787 | filemap_invalidate_unlock(mapping); |
6ae330ca | 1788 | |
e00d2c2d | 1789 | return 0; |
3be5a52b MS |
1790 | |
1791 | error: | |
1792 | if (is_truncate) | |
1793 | fuse_release_nowrite(inode); | |
1794 | ||
06a7c3c2 | 1795 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
6ae330ca VG |
1796 | |
1797 | if (fault_blocked) | |
8bcbbe9c | 1798 | filemap_invalidate_unlock(mapping); |
3be5a52b | 1799 | return err; |
9e6268db MS |
1800 | } |
1801 | ||
549c7297 CB |
1802 | static int fuse_setattr(struct user_namespace *mnt_userns, struct dentry *entry, |
1803 | struct iattr *attr) | |
49d4914f | 1804 | { |
2b0143b5 | 1805 | struct inode *inode = d_inode(entry); |
5e940c1d | 1806 | struct fuse_conn *fc = get_fuse_conn(inode); |
a09f99ed | 1807 | struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL; |
5e2b8828 | 1808 | int ret; |
efb9fa9e | 1809 | |
5d069dbe MS |
1810 | if (fuse_is_bad(inode)) |
1811 | return -EIO; | |
1812 | ||
efb9fa9e MP |
1813 | if (!fuse_allow_current_process(get_fuse_conn(inode))) |
1814 | return -EACCES; | |
1815 | ||
a09f99ed | 1816 | if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) { |
a09f99ed MS |
1817 | attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | |
1818 | ATTR_MODE); | |
5e940c1d | 1819 | |
a09f99ed | 1820 | /* |
5e940c1d MS |
1821 | * The only sane way to reliably kill suid/sgid is to do it in |
1822 | * the userspace filesystem | |
1823 | * | |
1824 | * This should be done on write(), truncate() and chown(). | |
a09f99ed | 1825 | */ |
8981bdfd | 1826 | if (!fc->handle_killpriv && !fc->handle_killpriv_v2) { |
5e940c1d MS |
1827 | /* |
1828 | * ia_mode calculation may have used stale i_mode. | |
1829 | * Refresh and recalculate. | |
1830 | */ | |
1831 | ret = fuse_do_getattr(inode, NULL, file); | |
1832 | if (ret) | |
1833 | return ret; | |
1834 | ||
1835 | attr->ia_mode = inode->i_mode; | |
c01638f5 | 1836 | if (inode->i_mode & S_ISUID) { |
5e940c1d MS |
1837 | attr->ia_valid |= ATTR_MODE; |
1838 | attr->ia_mode &= ~S_ISUID; | |
1839 | } | |
c01638f5 | 1840 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { |
5e940c1d MS |
1841 | attr->ia_valid |= ATTR_MODE; |
1842 | attr->ia_mode &= ~S_ISGID; | |
1843 | } | |
a09f99ed MS |
1844 | } |
1845 | } | |
1846 | if (!attr->ia_valid) | |
1847 | return 0; | |
5e2b8828 | 1848 | |
abb5a14f | 1849 | ret = fuse_do_setattr(entry, attr, file); |
5e2b8828 | 1850 | if (!ret) { |
60bcc88a SF |
1851 | /* |
1852 | * If filesystem supports acls it may have updated acl xattrs in | |
1853 | * the filesystem, so forget cached acls for the inode. | |
1854 | */ | |
1855 | if (fc->posix_acl) | |
1856 | forget_all_cached_acls(inode); | |
1857 | ||
5e2b8828 MS |
1858 | /* Directory mode changed, may need to revalidate access */ |
1859 | if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE)) | |
1860 | fuse_invalidate_entry_cache(entry); | |
1861 | } | |
1862 | return ret; | |
49d4914f MS |
1863 | } |
1864 | ||
549c7297 CB |
1865 | static int fuse_getattr(struct user_namespace *mnt_userns, |
1866 | const struct path *path, struct kstat *stat, | |
a528d35e | 1867 | u32 request_mask, unsigned int flags) |
e5e5558e | 1868 | { |
a528d35e | 1869 | struct inode *inode = d_inode(path->dentry); |
244f6385 | 1870 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1871 | |
5d069dbe MS |
1872 | if (fuse_is_bad(inode)) |
1873 | return -EIO; | |
1874 | ||
5157da2c MS |
1875 | if (!fuse_allow_current_process(fc)) { |
1876 | if (!request_mask) { | |
1877 | /* | |
1878 | * If user explicitly requested *nothing* then don't | |
1879 | * error out, but return st_dev only. | |
1880 | */ | |
1881 | stat->result_mask = 0; | |
1882 | stat->dev = inode->i_sb->s_dev; | |
1883 | return 0; | |
1884 | } | |
244f6385 | 1885 | return -EACCES; |
5157da2c | 1886 | } |
244f6385 | 1887 | |
2f1e8196 | 1888 | return fuse_update_get_attr(inode, NULL, stat, request_mask, flags); |
e5e5558e MS |
1889 | } |
1890 | ||
754661f1 | 1891 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1892 | .lookup = fuse_lookup, |
9e6268db MS |
1893 | .mkdir = fuse_mkdir, |
1894 | .symlink = fuse_symlink, | |
1895 | .unlink = fuse_unlink, | |
1896 | .rmdir = fuse_rmdir, | |
2773bf00 | 1897 | .rename = fuse_rename2, |
9e6268db MS |
1898 | .link = fuse_link, |
1899 | .setattr = fuse_setattr, | |
1900 | .create = fuse_create, | |
c8ccbe03 | 1901 | .atomic_open = fuse_atomic_open, |
9e6268db | 1902 | .mknod = fuse_mknod, |
e5e5558e MS |
1903 | .permission = fuse_permission, |
1904 | .getattr = fuse_getattr, | |
92a8780e | 1905 | .listxattr = fuse_listxattr, |
60bcc88a SF |
1906 | .get_acl = fuse_get_acl, |
1907 | .set_acl = fuse_set_acl, | |
72227eac MS |
1908 | .fileattr_get = fuse_fileattr_get, |
1909 | .fileattr_set = fuse_fileattr_set, | |
e5e5558e MS |
1910 | }; |
1911 | ||
4b6f5d20 | 1912 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1913 | .llseek = generic_file_llseek, |
e5e5558e | 1914 | .read = generic_read_dir, |
d9b3dbdc | 1915 | .iterate_shared = fuse_readdir, |
e5e5558e MS |
1916 | .open = fuse_dir_open, |
1917 | .release = fuse_dir_release, | |
82547981 | 1918 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1919 | .unlocked_ioctl = fuse_dir_ioctl, |
1920 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1921 | }; |
1922 | ||
754661f1 | 1923 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1924 | .setattr = fuse_setattr, |
e5e5558e MS |
1925 | .permission = fuse_permission, |
1926 | .getattr = fuse_getattr, | |
92a8780e | 1927 | .listxattr = fuse_listxattr, |
60bcc88a SF |
1928 | .get_acl = fuse_get_acl, |
1929 | .set_acl = fuse_set_acl, | |
72227eac MS |
1930 | .fileattr_get = fuse_fileattr_get, |
1931 | .fileattr_set = fuse_fileattr_set, | |
e5e5558e MS |
1932 | }; |
1933 | ||
754661f1 | 1934 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1935 | .setattr = fuse_setattr, |
6b255391 | 1936 | .get_link = fuse_get_link, |
e5e5558e | 1937 | .getattr = fuse_getattr, |
92a8780e | 1938 | .listxattr = fuse_listxattr, |
e5e5558e MS |
1939 | }; |
1940 | ||
1941 | void fuse_init_common(struct inode *inode) | |
1942 | { | |
1943 | inode->i_op = &fuse_common_inode_operations; | |
1944 | } | |
1945 | ||
1946 | void fuse_init_dir(struct inode *inode) | |
1947 | { | |
ab2257e9 MS |
1948 | struct fuse_inode *fi = get_fuse_inode(inode); |
1949 | ||
e5e5558e MS |
1950 | inode->i_op = &fuse_dir_inode_operations; |
1951 | inode->i_fop = &fuse_dir_operations; | |
ab2257e9 MS |
1952 | |
1953 | spin_lock_init(&fi->rdc.lock); | |
1954 | fi->rdc.cached = false; | |
1955 | fi->rdc.size = 0; | |
1956 | fi->rdc.pos = 0; | |
1957 | fi->rdc.version = 0; | |
e5e5558e MS |
1958 | } |
1959 | ||
5571f1e6 DS |
1960 | static int fuse_symlink_readpage(struct file *null, struct page *page) |
1961 | { | |
1962 | int err = fuse_readlink_page(page->mapping->host, page); | |
1963 | ||
1964 | if (!err) | |
1965 | SetPageUptodate(page); | |
1966 | ||
1967 | unlock_page(page); | |
1968 | ||
1969 | return err; | |
1970 | } | |
1971 | ||
1972 | static const struct address_space_operations fuse_symlink_aops = { | |
1973 | .readpage = fuse_symlink_readpage, | |
1974 | }; | |
1975 | ||
e5e5558e MS |
1976 | void fuse_init_symlink(struct inode *inode) |
1977 | { | |
1978 | inode->i_op = &fuse_symlink_inode_operations; | |
5571f1e6 DS |
1979 | inode->i_data.a_ops = &fuse_symlink_aops; |
1980 | inode_nohighmem(inode); | |
e5e5558e | 1981 | } |