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> |
9ccf47b2 | 14 | #include <linux/moduleparam.h> |
e5e5558e MS |
15 | #include <linux/sched.h> |
16 | #include <linux/namei.h> | |
07e77dca | 17 | #include <linux/slab.h> |
703c7362 | 18 | #include <linux/xattr.h> |
261aaba7 | 19 | #include <linux/iversion.h> |
60bcc88a | 20 | #include <linux/posix_acl.h> |
3e2b6fdb VG |
21 | #include <linux/security.h> |
22 | #include <linux/types.h> | |
23 | #include <linux/kernel.h> | |
e5e5558e | 24 | |
9ccf47b2 DM |
25 | static bool __read_mostly allow_sys_admin_access; |
26 | module_param(allow_sys_admin_access, bool, 0644); | |
27 | MODULE_PARM_DESC(allow_sys_admin_access, | |
28 | "Allow users with CAP_SYS_ADMIN in initial userns to bypass allow_other access check"); | |
29 | ||
4582a4ab FS |
30 | static void fuse_advise_use_readdirplus(struct inode *dir) |
31 | { | |
32 | struct fuse_inode *fi = get_fuse_inode(dir); | |
33 | ||
34 | set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state); | |
35 | } | |
36 | ||
30c6a23d KK |
37 | #if BITS_PER_LONG >= 64 |
38 | static inline void __fuse_dentry_settime(struct dentry *entry, u64 time) | |
39 | { | |
40 | entry->d_fsdata = (void *) time; | |
41 | } | |
42 | ||
43 | static inline u64 fuse_dentry_time(const struct dentry *entry) | |
44 | { | |
45 | return (u64)entry->d_fsdata; | |
46 | } | |
47 | ||
48 | #else | |
f75fdf22 MS |
49 | union fuse_dentry { |
50 | u64 time; | |
51 | struct rcu_head rcu; | |
52 | }; | |
53 | ||
30c6a23d KK |
54 | static inline void __fuse_dentry_settime(struct dentry *dentry, u64 time) |
55 | { | |
56 | ((union fuse_dentry *) dentry->d_fsdata)->time = time; | |
57 | } | |
58 | ||
59 | static inline u64 fuse_dentry_time(const struct dentry *entry) | |
60 | { | |
61 | return ((union fuse_dentry *) entry->d_fsdata)->time; | |
62 | } | |
63 | #endif | |
64 | ||
8fab0106 | 65 | static void fuse_dentry_settime(struct dentry *dentry, u64 time) |
0a0898cf | 66 | { |
8fab0106 MS |
67 | struct fuse_conn *fc = get_fuse_conn_super(dentry->d_sb); |
68 | bool delete = !time && fc->delete_stale; | |
69 | /* | |
70 | * Mess with DCACHE_OP_DELETE because dput() will be faster without it. | |
71 | * Don't care about races, either way it's just an optimization | |
72 | */ | |
73 | if ((!delete && (dentry->d_flags & DCACHE_OP_DELETE)) || | |
74 | (delete && !(dentry->d_flags & DCACHE_OP_DELETE))) { | |
75 | spin_lock(&dentry->d_lock); | |
76 | if (!delete) | |
77 | dentry->d_flags &= ~DCACHE_OP_DELETE; | |
78 | else | |
79 | dentry->d_flags |= DCACHE_OP_DELETE; | |
80 | spin_unlock(&dentry->d_lock); | |
81 | } | |
82 | ||
30c6a23d | 83 | __fuse_dentry_settime(dentry, time); |
0a0898cf | 84 | } |
0a0898cf | 85 | |
6f9f1180 MS |
86 | /* |
87 | * FUSE caches dentries and attributes with separate timeout. The | |
88 | * time in jiffies until the dentry/attributes are valid is stored in | |
f75fdf22 | 89 | * dentry->d_fsdata and fuse_inode->i_time respectively. |
6f9f1180 MS |
90 | */ |
91 | ||
92 | /* | |
93 | * Calculate the time in jiffies until a dentry/attributes are valid | |
94 | */ | |
bcb6f6d2 | 95 | static u64 time_to_jiffies(u64 sec, u32 nsec) |
e5e5558e | 96 | { |
685d16dd | 97 | if (sec || nsec) { |
bcb6f6d2 MS |
98 | struct timespec64 ts = { |
99 | sec, | |
21067527 | 100 | min_t(u32, nsec, NSEC_PER_SEC - 1) |
bcb6f6d2 MS |
101 | }; |
102 | ||
103 | return get_jiffies_64() + timespec64_to_jiffies(&ts); | |
685d16dd | 104 | } else |
0a0898cf | 105 | return 0; |
e5e5558e MS |
106 | } |
107 | ||
6f9f1180 MS |
108 | /* |
109 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
110 | * replies | |
111 | */ | |
d123d8e1 | 112 | void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o) |
0aa7c699 | 113 | { |
0a0898cf MS |
114 | fuse_dentry_settime(entry, |
115 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
1fb69e78 MS |
116 | } |
117 | ||
118 | static u64 attr_timeout(struct fuse_attr_out *o) | |
119 | { | |
120 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
121 | } | |
122 | ||
d123d8e1 | 123 | u64 entry_attr_timeout(struct fuse_entry_out *o) |
1fb69e78 MS |
124 | { |
125 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
8cbdf1e6 MS |
126 | } |
127 | ||
fa5eee57 | 128 | void fuse_invalidate_attr_mask(struct inode *inode, u32 mask) |
2f1e8196 MS |
129 | { |
130 | set_mask_bits(&get_fuse_inode(inode)->inval_mask, 0, mask); | |
131 | } | |
132 | ||
6f9f1180 MS |
133 | /* |
134 | * Mark the attributes as stale, so that at the next call to | |
135 | * ->getattr() they will be fetched from userspace | |
136 | */ | |
8cbdf1e6 MS |
137 | void fuse_invalidate_attr(struct inode *inode) |
138 | { | |
2f1e8196 | 139 | fuse_invalidate_attr_mask(inode, STATX_BASIC_STATS); |
8cbdf1e6 MS |
140 | } |
141 | ||
261aaba7 MS |
142 | static void fuse_dir_changed(struct inode *dir) |
143 | { | |
144 | fuse_invalidate_attr(dir); | |
145 | inode_maybe_inc_iversion(dir, false); | |
146 | } | |
147 | ||
451418fc AG |
148 | /** |
149 | * Mark the attributes as stale due to an atime change. Avoid the invalidate if | |
150 | * atime is not used. | |
151 | */ | |
152 | void fuse_invalidate_atime(struct inode *inode) | |
153 | { | |
154 | if (!IS_RDONLY(inode)) | |
2f1e8196 | 155 | fuse_invalidate_attr_mask(inode, STATX_ATIME); |
451418fc AG |
156 | } |
157 | ||
6f9f1180 MS |
158 | /* |
159 | * Just mark the entry as stale, so that a next attempt to look it up | |
160 | * will result in a new lookup call to userspace | |
161 | * | |
162 | * This is called when a dentry is about to become negative and the | |
163 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
164 | * lookup) | |
165 | */ | |
dbd561d2 | 166 | void fuse_invalidate_entry_cache(struct dentry *entry) |
8cbdf1e6 | 167 | { |
0a0898cf | 168 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
169 | } |
170 | ||
6f9f1180 MS |
171 | /* |
172 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
173 | * dentry from the hash | |
174 | */ | |
8cbdf1e6 MS |
175 | static void fuse_invalidate_entry(struct dentry *entry) |
176 | { | |
177 | d_invalidate(entry); | |
178 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
179 | } |
180 | ||
7078187a | 181 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, |
13983d06 | 182 | u64 nodeid, const struct qstr *name, |
e5e5558e MS |
183 | struct fuse_entry_out *outarg) |
184 | { | |
0e9663ee | 185 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
d5b48543 MS |
186 | args->opcode = FUSE_LOOKUP; |
187 | args->nodeid = nodeid; | |
188 | args->in_numargs = 1; | |
189 | args->in_args[0].size = name->len + 1; | |
190 | args->in_args[0].value = name->name; | |
191 | args->out_numargs = 1; | |
192 | args->out_args[0].size = sizeof(struct fuse_entry_out); | |
193 | args->out_args[0].value = outarg; | |
e5e5558e MS |
194 | } |
195 | ||
6f9f1180 MS |
196 | /* |
197 | * Check whether the dentry is still valid | |
198 | * | |
199 | * If the entry validity timeout has expired and the dentry is | |
200 | * positive, try to redo the lookup. If the lookup results in a | |
201 | * different inode, then let the VFS invalidate the dentry and redo | |
202 | * the lookup once more. If the lookup results in the same inode, | |
203 | * then refresh the attributes, timeouts and mark the dentry valid. | |
204 | */ | |
0b728e19 | 205 | static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) |
e5e5558e | 206 | { |
34286d66 | 207 | struct inode *inode; |
28420dad | 208 | struct dentry *parent; |
fcee216b | 209 | struct fuse_mount *fm; |
6314efee | 210 | struct fuse_inode *fi; |
e2a6b952 | 211 | int ret; |
8cbdf1e6 | 212 | |
2b0143b5 | 213 | inode = d_inode_rcu(entry); |
5d069dbe | 214 | if (inode && fuse_is_bad(inode)) |
e2a6b952 | 215 | goto invalid; |
154210cc | 216 | else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) || |
ccc031e2 | 217 | (flags & (LOOKUP_EXCL | LOOKUP_REVAL | LOOKUP_RENAME_TARGET))) { |
e5e5558e | 218 | struct fuse_entry_out outarg; |
7078187a | 219 | FUSE_ARGS(args); |
07e77dca | 220 | struct fuse_forget_link *forget; |
1fb69e78 | 221 | u64 attr_version; |
8cbdf1e6 | 222 | |
50322fe7 | 223 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 | 224 | if (!inode) |
e2a6b952 | 225 | goto invalid; |
8cbdf1e6 | 226 | |
e2a6b952 | 227 | ret = -ECHILD; |
0b728e19 | 228 | if (flags & LOOKUP_RCU) |
e2a6b952 | 229 | goto out; |
e7c0a167 | 230 | |
fcee216b | 231 | fm = get_fuse_mount(inode); |
e5e5558e | 232 | |
07e77dca | 233 | forget = fuse_alloc_forget(); |
7078187a MS |
234 | ret = -ENOMEM; |
235 | if (!forget) | |
e2a6b952 | 236 | goto out; |
2d51013e | 237 | |
fcee216b | 238 | attr_version = fuse_get_attr_version(fm->fc); |
1fb69e78 | 239 | |
e956edd0 | 240 | parent = dget_parent(entry); |
fcee216b | 241 | fuse_lookup_init(fm->fc, &args, get_node_id(d_inode(parent)), |
c180eebe | 242 | &entry->d_name, &outarg); |
fcee216b | 243 | ret = fuse_simple_request(fm, &args); |
e956edd0 | 244 | dput(parent); |
50322fe7 | 245 | /* Zero nodeid is same as -ENOENT */ |
7078187a MS |
246 | if (!ret && !outarg.nodeid) |
247 | ret = -ENOENT; | |
248 | if (!ret) { | |
6314efee | 249 | fi = get_fuse_inode(inode); |
bf109c64 MR |
250 | if (outarg.nodeid != get_node_id(inode) || |
251 | (bool) IS_AUTOMOUNT(inode) != (bool) (outarg.attr.flags & FUSE_ATTR_SUBMOUNT)) { | |
fcee216b MR |
252 | fuse_queue_forget(fm->fc, forget, |
253 | outarg.nodeid, 1); | |
e2a6b952 | 254 | goto invalid; |
9e6268db | 255 | } |
c9d8f5f0 | 256 | spin_lock(&fi->lock); |
1729a16c | 257 | fi->nlookup++; |
c9d8f5f0 | 258 | spin_unlock(&fi->lock); |
9e6268db | 259 | } |
07e77dca | 260 | kfree(forget); |
7078187a MS |
261 | if (ret == -ENOMEM) |
262 | goto out; | |
eb59bd17 | 263 | if (ret || fuse_invalid_attr(&outarg.attr) || |
15db1683 | 264 | fuse_stale_inode(inode, outarg.generation, &outarg.attr)) |
e2a6b952 | 265 | goto invalid; |
e5e5558e | 266 | |
60bcc88a | 267 | forget_all_cached_acls(inode); |
1fb69e78 MS |
268 | fuse_change_attributes(inode, &outarg.attr, |
269 | entry_attr_timeout(&outarg), | |
270 | attr_version); | |
271 | fuse_change_entry_timeout(entry, &outarg); | |
28420dad | 272 | } else if (inode) { |
6314efee MS |
273 | fi = get_fuse_inode(inode); |
274 | if (flags & LOOKUP_RCU) { | |
275 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) | |
276 | return -ECHILD; | |
277 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { | |
28420dad | 278 | parent = dget_parent(entry); |
2b0143b5 | 279 | fuse_advise_use_readdirplus(d_inode(parent)); |
28420dad MS |
280 | dput(parent); |
281 | } | |
e5e5558e | 282 | } |
e2a6b952 MS |
283 | ret = 1; |
284 | out: | |
285 | return ret; | |
286 | ||
287 | invalid: | |
288 | ret = 0; | |
289 | goto out; | |
e5e5558e MS |
290 | } |
291 | ||
30c6a23d | 292 | #if BITS_PER_LONG < 64 |
f75fdf22 MS |
293 | static int fuse_dentry_init(struct dentry *dentry) |
294 | { | |
dc69e98c KK |
295 | dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), |
296 | GFP_KERNEL_ACCOUNT | __GFP_RECLAIMABLE); | |
f75fdf22 MS |
297 | |
298 | return dentry->d_fsdata ? 0 : -ENOMEM; | |
299 | } | |
300 | static void fuse_dentry_release(struct dentry *dentry) | |
301 | { | |
302 | union fuse_dentry *fd = dentry->d_fsdata; | |
303 | ||
304 | kfree_rcu(fd, rcu); | |
305 | } | |
30c6a23d | 306 | #endif |
f75fdf22 | 307 | |
8fab0106 MS |
308 | static int fuse_dentry_delete(const struct dentry *dentry) |
309 | { | |
310 | return time_before64(fuse_dentry_time(dentry), get_jiffies_64()); | |
311 | } | |
312 | ||
bf109c64 MR |
313 | /* |
314 | * Create a fuse_mount object with a new superblock (with path->dentry | |
315 | * as the root), and return that mount so it can be auto-mounted on | |
316 | * @path. | |
317 | */ | |
318 | static struct vfsmount *fuse_dentry_automount(struct path *path) | |
319 | { | |
320 | struct fs_context *fsc; | |
bf109c64 MR |
321 | struct vfsmount *mnt; |
322 | struct fuse_inode *mp_fi = get_fuse_inode(d_inode(path->dentry)); | |
bf109c64 MR |
323 | |
324 | fsc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry); | |
29e0e4df GK |
325 | if (IS_ERR(fsc)) |
326 | return ERR_CAST(fsc); | |
bf109c64 | 327 | |
266eb3f2 GK |
328 | /* Pass the FUSE inode of the mount for fuse_get_tree_submount() */ |
329 | fsc->fs_private = mp_fi; | |
bf109c64 | 330 | |
bf109c64 | 331 | /* Create the submount */ |
29e0e4df GK |
332 | mnt = fc_mount(fsc); |
333 | if (!IS_ERR(mnt)) | |
334 | mntget(mnt); | |
bf109c64 | 335 | |
bf109c64 | 336 | put_fs_context(fsc); |
29e0e4df | 337 | return mnt; |
bf109c64 MR |
338 | } |
339 | ||
4269590a | 340 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e | 341 | .d_revalidate = fuse_dentry_revalidate, |
8fab0106 | 342 | .d_delete = fuse_dentry_delete, |
30c6a23d | 343 | #if BITS_PER_LONG < 64 |
f75fdf22 MS |
344 | .d_init = fuse_dentry_init, |
345 | .d_release = fuse_dentry_release, | |
30c6a23d | 346 | #endif |
bf109c64 | 347 | .d_automount = fuse_dentry_automount, |
e5e5558e MS |
348 | }; |
349 | ||
0ce267ff | 350 | const struct dentry_operations fuse_root_dentry_operations = { |
30c6a23d | 351 | #if BITS_PER_LONG < 64 |
0ce267ff MS |
352 | .d_init = fuse_dentry_init, |
353 | .d_release = fuse_dentry_release, | |
30c6a23d | 354 | #endif |
0ce267ff MS |
355 | }; |
356 | ||
a5bfffac | 357 | int fuse_valid_type(int m) |
39ee059a MS |
358 | { |
359 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
360 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
361 | } | |
362 | ||
eb59bd17 MS |
363 | bool fuse_invalid_attr(struct fuse_attr *attr) |
364 | { | |
365 | return !fuse_valid_type(attr->mode) || | |
366 | attr->size > LLONG_MAX; | |
367 | } | |
368 | ||
13983d06 | 369 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name, |
c180eebe | 370 | struct fuse_entry_out *outarg, struct inode **inode) |
e5e5558e | 371 | { |
fcee216b | 372 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
7078187a | 373 | FUSE_ARGS(args); |
07e77dca | 374 | struct fuse_forget_link *forget; |
1fb69e78 | 375 | u64 attr_version; |
c180eebe | 376 | int err; |
e5e5558e | 377 | |
c180eebe MS |
378 | *inode = NULL; |
379 | err = -ENAMETOOLONG; | |
380 | if (name->len > FUSE_NAME_MAX) | |
381 | goto out; | |
e5e5558e | 382 | |
e5e5558e | 383 | |
07e77dca MS |
384 | forget = fuse_alloc_forget(); |
385 | err = -ENOMEM; | |
7078187a | 386 | if (!forget) |
c180eebe | 387 | goto out; |
2d51013e | 388 | |
fcee216b | 389 | attr_version = fuse_get_attr_version(fm->fc); |
1fb69e78 | 390 | |
fcee216b MR |
391 | fuse_lookup_init(fm->fc, &args, nodeid, name, outarg); |
392 | err = fuse_simple_request(fm, &args); | |
50322fe7 | 393 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
394 | if (err || !outarg->nodeid) |
395 | goto out_put_forget; | |
396 | ||
397 | err = -EIO; | |
398 | if (!outarg->nodeid) | |
399 | goto out_put_forget; | |
eb59bd17 | 400 | if (fuse_invalid_attr(&outarg->attr)) |
c180eebe MS |
401 | goto out_put_forget; |
402 | ||
403 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
404 | &outarg->attr, entry_attr_timeout(outarg), | |
405 | attr_version); | |
406 | err = -ENOMEM; | |
407 | if (!*inode) { | |
fcee216b | 408 | fuse_queue_forget(fm->fc, forget, outarg->nodeid, 1); |
c180eebe | 409 | goto out; |
e5e5558e | 410 | } |
c180eebe MS |
411 | err = 0; |
412 | ||
413 | out_put_forget: | |
07e77dca | 414 | kfree(forget); |
c180eebe MS |
415 | out: |
416 | return err; | |
417 | } | |
418 | ||
419 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 420 | unsigned int flags) |
c180eebe MS |
421 | { |
422 | int err; | |
423 | struct fuse_entry_out outarg; | |
424 | struct inode *inode; | |
425 | struct dentry *newent; | |
c180eebe | 426 | bool outarg_valid = true; |
63576c13 | 427 | bool locked; |
c180eebe | 428 | |
5d069dbe MS |
429 | if (fuse_is_bad(dir)) |
430 | return ERR_PTR(-EIO); | |
431 | ||
63576c13 | 432 | locked = fuse_lock_inode(dir); |
c180eebe MS |
433 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, |
434 | &outarg, &inode); | |
63576c13 | 435 | fuse_unlock_inode(dir, locked); |
c180eebe MS |
436 | if (err == -ENOENT) { |
437 | outarg_valid = false; | |
438 | err = 0; | |
439 | } | |
440 | if (err) | |
441 | goto out_err; | |
442 | ||
443 | err = -EIO; | |
444 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
445 | goto out_iput; | |
e5e5558e | 446 | |
41d28bca | 447 | newent = d_splice_alias(inode, entry); |
5835f339 MS |
448 | err = PTR_ERR(newent); |
449 | if (IS_ERR(newent)) | |
450 | goto out_err; | |
d2a85164 | 451 | |
0de6256d | 452 | entry = newent ? newent : entry; |
c180eebe | 453 | if (outarg_valid) |
1fb69e78 | 454 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
455 | else |
456 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 457 | |
6c26f717 MS |
458 | if (inode) |
459 | fuse_advise_use_readdirplus(dir); | |
0de6256d | 460 | return newent; |
c180eebe MS |
461 | |
462 | out_iput: | |
463 | iput(inode); | |
464 | out_err: | |
465 | return ERR_PTR(err); | |
e5e5558e MS |
466 | } |
467 | ||
3e2b6fdb VG |
468 | static int get_security_context(struct dentry *entry, umode_t mode, |
469 | void **security_ctx, u32 *security_ctxlen) | |
470 | { | |
471 | struct fuse_secctx *fctx; | |
472 | struct fuse_secctx_header *header; | |
473 | void *ctx = NULL, *ptr; | |
474 | u32 ctxlen, total_len = sizeof(*header); | |
475 | int err, nr_ctx = 0; | |
476 | const char *name; | |
477 | size_t namelen; | |
478 | ||
479 | err = security_dentry_init_security(entry, mode, &entry->d_name, | |
480 | &name, &ctx, &ctxlen); | |
481 | if (err) { | |
482 | if (err != -EOPNOTSUPP) | |
483 | goto out_err; | |
484 | /* No LSM is supporting this security hook. Ignore error */ | |
485 | ctxlen = 0; | |
486 | ctx = NULL; | |
487 | } | |
488 | ||
489 | if (ctxlen) { | |
490 | nr_ctx = 1; | |
491 | namelen = strlen(name) + 1; | |
492 | err = -EIO; | |
493 | if (WARN_ON(namelen > XATTR_NAME_MAX + 1 || ctxlen > S32_MAX)) | |
494 | goto out_err; | |
495 | total_len += FUSE_REC_ALIGN(sizeof(*fctx) + namelen + ctxlen); | |
496 | } | |
497 | ||
498 | err = -ENOMEM; | |
499 | header = ptr = kzalloc(total_len, GFP_KERNEL); | |
500 | if (!ptr) | |
501 | goto out_err; | |
502 | ||
503 | header->nr_secctx = nr_ctx; | |
504 | header->size = total_len; | |
505 | ptr += sizeof(*header); | |
506 | if (nr_ctx) { | |
507 | fctx = ptr; | |
508 | fctx->size = ctxlen; | |
509 | ptr += sizeof(*fctx); | |
510 | ||
511 | strcpy(ptr, name); | |
512 | ptr += namelen; | |
513 | ||
514 | memcpy(ptr, ctx, ctxlen); | |
515 | } | |
516 | *security_ctxlen = total_len; | |
517 | *security_ctx = header; | |
518 | err = 0; | |
519 | out_err: | |
520 | kfree(ctx); | |
521 | return err; | |
522 | } | |
523 | ||
6f9f1180 MS |
524 | /* |
525 | * Atomic create+open operation | |
526 | * | |
527 | * If the filesystem doesn't support this, then fall back to separate | |
528 | * 'mknod' + 'open' requests. | |
529 | */ | |
d9585277 | 530 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
54d601cb | 531 | struct file *file, unsigned int flags, |
7d375390 | 532 | umode_t mode, u32 opcode) |
fd72faac MS |
533 | { |
534 | int err; | |
535 | struct inode *inode; | |
fcee216b | 536 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a | 537 | FUSE_ARGS(args); |
07e77dca | 538 | struct fuse_forget_link *forget; |
e0a43ddc | 539 | struct fuse_create_in inarg; |
fd72faac MS |
540 | struct fuse_open_out outopen; |
541 | struct fuse_entry_out outentry; | |
ebf84d0c | 542 | struct fuse_inode *fi; |
fd72faac | 543 | struct fuse_file *ff; |
3e2b6fdb VG |
544 | void *security_ctx = NULL; |
545 | u32 security_ctxlen; | |
2fdbb8dd | 546 | bool trunc = flags & O_TRUNC; |
fd72faac | 547 | |
af109bca MS |
548 | /* Userspace expects S_IFREG in create mode */ |
549 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
550 | ||
07e77dca | 551 | forget = fuse_alloc_forget(); |
c8ccbe03 | 552 | err = -ENOMEM; |
07e77dca | 553 | if (!forget) |
c8ccbe03 | 554 | goto out_err; |
51eb01e7 | 555 | |
ce1d5a49 | 556 | err = -ENOMEM; |
fcee216b | 557 | ff = fuse_file_alloc(fm); |
fd72faac | 558 | if (!ff) |
7078187a | 559 | goto out_put_forget_req; |
fd72faac | 560 | |
fcee216b | 561 | if (!fm->fc->dont_mask) |
e0a43ddc MS |
562 | mode &= ~current_umask(); |
563 | ||
fd72faac MS |
564 | flags &= ~O_NOCTTY; |
565 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 566 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
567 | inarg.flags = flags; |
568 | inarg.mode = mode; | |
e0a43ddc | 569 | inarg.umask = current_umask(); |
643a666a | 570 | |
2fdbb8dd | 571 | if (fm->fc->handle_killpriv_v2 && trunc && |
643a666a VG |
572 | !(flags & O_EXCL) && !capable(CAP_FSETID)) { |
573 | inarg.open_flags |= FUSE_OPEN_KILL_SUIDGID; | |
574 | } | |
575 | ||
7d375390 | 576 | args.opcode = opcode; |
d5b48543 MS |
577 | args.nodeid = get_node_id(dir); |
578 | args.in_numargs = 2; | |
579 | args.in_args[0].size = sizeof(inarg); | |
580 | args.in_args[0].value = &inarg; | |
581 | args.in_args[1].size = entry->d_name.len + 1; | |
582 | args.in_args[1].value = entry->d_name.name; | |
583 | args.out_numargs = 2; | |
584 | args.out_args[0].size = sizeof(outentry); | |
585 | args.out_args[0].value = &outentry; | |
586 | args.out_args[1].size = sizeof(outopen); | |
587 | args.out_args[1].value = &outopen; | |
3e2b6fdb VG |
588 | |
589 | if (fm->fc->init_security) { | |
590 | err = get_security_context(entry, mode, &security_ctx, | |
591 | &security_ctxlen); | |
592 | if (err) | |
593 | goto out_put_forget_req; | |
594 | ||
595 | args.in_numargs = 3; | |
596 | args.in_args[2].size = security_ctxlen; | |
597 | args.in_args[2].value = security_ctx; | |
598 | } | |
599 | ||
fcee216b | 600 | err = fuse_simple_request(fm, &args); |
3e2b6fdb | 601 | kfree(security_ctx); |
c8ccbe03 | 602 | if (err) |
fd72faac | 603 | goto out_free_ff; |
fd72faac MS |
604 | |
605 | err = -EIO; | |
eb59bd17 MS |
606 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid) || |
607 | fuse_invalid_attr(&outentry.attr)) | |
fd72faac MS |
608 | goto out_free_ff; |
609 | ||
c7b7143c MS |
610 | ff->fh = outopen.fh; |
611 | ff->nodeid = outentry.nodeid; | |
612 | ff->open_flags = outopen.open_flags; | |
fd72faac | 613 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 614 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
615 | if (!inode) { |
616 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
ebf84d0c | 617 | fuse_sync_release(NULL, ff, flags); |
fcee216b | 618 | fuse_queue_forget(fm->fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
619 | err = -ENOMEM; |
620 | goto out_err; | |
fd72faac | 621 | } |
07e77dca | 622 | kfree(forget); |
fd72faac | 623 | d_instantiate(entry, inode); |
1fb69e78 | 624 | fuse_change_entry_timeout(entry, &outentry); |
261aaba7 | 625 | fuse_dir_changed(dir); |
be12af3e | 626 | err = finish_open(file, entry, generic_file_open); |
30d90494 | 627 | if (err) { |
ebf84d0c KT |
628 | fi = get_fuse_inode(inode); |
629 | fuse_sync_release(fi, ff, flags); | |
c8ccbe03 | 630 | } else { |
267d8444 | 631 | file->private_data = ff; |
c8ccbe03 | 632 | fuse_finish_open(inode, file); |
2fdbb8dd MS |
633 | if (fm->fc->atomic_o_trunc && trunc) |
634 | truncate_pagecache(inode, 0); | |
635 | else if (!(ff->open_flags & FOPEN_KEEP_CACHE)) | |
636 | invalidate_inode_pages2(inode->i_mapping); | |
fd72faac | 637 | } |
d9585277 | 638 | return err; |
fd72faac | 639 | |
c8ccbe03 | 640 | out_free_ff: |
fd72faac | 641 | fuse_file_free(ff); |
c8ccbe03 | 642 | out_put_forget_req: |
07e77dca | 643 | kfree(forget); |
c8ccbe03 | 644 | out_err: |
d9585277 | 645 | return err; |
c8ccbe03 MS |
646 | } |
647 | ||
5ebb29be | 648 | static int fuse_mknod(struct mnt_idmap *, struct inode *, struct dentry *, |
549c7297 | 649 | umode_t, dev_t); |
d9585277 | 650 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 651 | struct file *file, unsigned flags, |
44907d79 | 652 | umode_t mode) |
c8ccbe03 MS |
653 | { |
654 | int err; | |
655 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
656 | struct dentry *res = NULL; |
657 | ||
5d069dbe MS |
658 | if (fuse_is_bad(dir)) |
659 | return -EIO; | |
660 | ||
00699ad8 | 661 | if (d_in_lookup(entry)) { |
00cd8dd3 | 662 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 663 | if (IS_ERR(res)) |
d9585277 | 664 | return PTR_ERR(res); |
c8ccbe03 MS |
665 | |
666 | if (res) | |
667 | entry = res; | |
668 | } | |
669 | ||
2b0143b5 | 670 | if (!(flags & O_CREAT) || d_really_is_positive(entry)) |
c8ccbe03 MS |
671 | goto no_open; |
672 | ||
673 | /* Only creates */ | |
73a09dd9 | 674 | file->f_mode |= FMODE_CREATED; |
c8ccbe03 MS |
675 | |
676 | if (fc->no_create) | |
677 | goto mknod; | |
678 | ||
7d375390 | 679 | err = fuse_create_open(dir, entry, file, flags, mode, FUSE_CREATE); |
d9585277 | 680 | if (err == -ENOSYS) { |
c8ccbe03 MS |
681 | fc->no_create = 1; |
682 | goto mknod; | |
683 | } | |
684 | out_dput: | |
685 | dput(res); | |
d9585277 | 686 | return err; |
c8ccbe03 MS |
687 | |
688 | mknod: | |
5ebb29be | 689 | err = fuse_mknod(&nop_mnt_idmap, dir, entry, mode, 0); |
d9585277 | 690 | if (err) |
c8ccbe03 | 691 | goto out_dput; |
c8ccbe03 | 692 | no_open: |
e45198a6 | 693 | return finish_no_open(file, res); |
fd72faac MS |
694 | } |
695 | ||
6f9f1180 MS |
696 | /* |
697 | * Code shared between mknod, mkdir, symlink and link | |
698 | */ | |
fcee216b | 699 | static int create_new_entry(struct fuse_mount *fm, struct fuse_args *args, |
9e6268db | 700 | struct inode *dir, struct dentry *entry, |
541af6a0 | 701 | umode_t mode) |
9e6268db MS |
702 | { |
703 | struct fuse_entry_out outarg; | |
704 | struct inode *inode; | |
c971e6a0 | 705 | struct dentry *d; |
9e6268db | 706 | int err; |
07e77dca | 707 | struct fuse_forget_link *forget; |
3e2b6fdb VG |
708 | void *security_ctx = NULL; |
709 | u32 security_ctxlen; | |
2d51013e | 710 | |
5d069dbe MS |
711 | if (fuse_is_bad(dir)) |
712 | return -EIO; | |
713 | ||
07e77dca | 714 | forget = fuse_alloc_forget(); |
7078187a | 715 | if (!forget) |
07e77dca | 716 | return -ENOMEM; |
9e6268db | 717 | |
0e9663ee | 718 | memset(&outarg, 0, sizeof(outarg)); |
d5b48543 MS |
719 | args->nodeid = get_node_id(dir); |
720 | args->out_numargs = 1; | |
721 | args->out_args[0].size = sizeof(outarg); | |
722 | args->out_args[0].value = &outarg; | |
3e2b6fdb VG |
723 | |
724 | if (fm->fc->init_security && args->opcode != FUSE_LINK) { | |
725 | err = get_security_context(entry, mode, &security_ctx, | |
726 | &security_ctxlen); | |
727 | if (err) | |
728 | goto out_put_forget_req; | |
729 | ||
730 | BUG_ON(args->in_numargs != 2); | |
731 | ||
732 | args->in_numargs = 3; | |
733 | args->in_args[2].size = security_ctxlen; | |
734 | args->in_args[2].value = security_ctx; | |
735 | } | |
736 | ||
fcee216b | 737 | err = fuse_simple_request(fm, args); |
3e2b6fdb | 738 | kfree(security_ctx); |
2d51013e MS |
739 | if (err) |
740 | goto out_put_forget_req; | |
741 | ||
39ee059a | 742 | err = -EIO; |
eb59bd17 | 743 | if (invalid_nodeid(outarg.nodeid) || fuse_invalid_attr(&outarg.attr)) |
2d51013e | 744 | goto out_put_forget_req; |
39ee059a MS |
745 | |
746 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 747 | goto out_put_forget_req; |
39ee059a | 748 | |
9e6268db | 749 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 750 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 751 | if (!inode) { |
fcee216b | 752 | fuse_queue_forget(fm->fc, forget, outarg.nodeid, 1); |
9e6268db MS |
753 | return -ENOMEM; |
754 | } | |
07e77dca | 755 | kfree(forget); |
9e6268db | 756 | |
c971e6a0 AV |
757 | d_drop(entry); |
758 | d = d_splice_alias(inode, entry); | |
759 | if (IS_ERR(d)) | |
760 | return PTR_ERR(d); | |
9e6268db | 761 | |
c971e6a0 AV |
762 | if (d) { |
763 | fuse_change_entry_timeout(d, &outarg); | |
764 | dput(d); | |
765 | } else { | |
766 | fuse_change_entry_timeout(entry, &outarg); | |
767 | } | |
261aaba7 | 768 | fuse_dir_changed(dir); |
9e6268db | 769 | return 0; |
39ee059a | 770 | |
2d51013e | 771 | out_put_forget_req: |
07e77dca | 772 | kfree(forget); |
39ee059a | 773 | return err; |
9e6268db MS |
774 | } |
775 | ||
5ebb29be | 776 | static int fuse_mknod(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 777 | struct dentry *entry, umode_t mode, dev_t rdev) |
9e6268db MS |
778 | { |
779 | struct fuse_mknod_in inarg; | |
fcee216b | 780 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a | 781 | FUSE_ARGS(args); |
9e6268db | 782 | |
fcee216b | 783 | if (!fm->fc->dont_mask) |
e0a43ddc MS |
784 | mode &= ~current_umask(); |
785 | ||
9e6268db MS |
786 | memset(&inarg, 0, sizeof(inarg)); |
787 | inarg.mode = mode; | |
788 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 789 | inarg.umask = current_umask(); |
d5b48543 MS |
790 | args.opcode = FUSE_MKNOD; |
791 | args.in_numargs = 2; | |
792 | args.in_args[0].size = sizeof(inarg); | |
793 | args.in_args[0].value = &inarg; | |
794 | args.in_args[1].size = entry->d_name.len + 1; | |
795 | args.in_args[1].value = entry->d_name.name; | |
fcee216b | 796 | return create_new_entry(fm, &args, dir, entry, mode); |
9e6268db MS |
797 | } |
798 | ||
6c960e68 | 799 | static int fuse_create(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 800 | struct dentry *entry, umode_t mode, bool excl) |
9e6268db | 801 | { |
5ebb29be | 802 | return fuse_mknod(&nop_mnt_idmap, dir, entry, mode, 0); |
9e6268db MS |
803 | } |
804 | ||
7d375390 MS |
805 | static int fuse_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, |
806 | struct file *file, umode_t mode) | |
807 | { | |
808 | struct fuse_conn *fc = get_fuse_conn(dir); | |
809 | int err; | |
810 | ||
811 | if (fc->no_tmpfile) | |
812 | return -EOPNOTSUPP; | |
813 | ||
814 | err = fuse_create_open(dir, file->f_path.dentry, file, file->f_flags, mode, FUSE_TMPFILE); | |
815 | if (err == -ENOSYS) { | |
816 | fc->no_tmpfile = 1; | |
817 | err = -EOPNOTSUPP; | |
818 | } | |
819 | return err; | |
820 | } | |
821 | ||
c54bd91e | 822 | static int fuse_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 823 | struct dentry *entry, umode_t mode) |
9e6268db MS |
824 | { |
825 | struct fuse_mkdir_in inarg; | |
fcee216b | 826 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a | 827 | FUSE_ARGS(args); |
9e6268db | 828 | |
fcee216b | 829 | if (!fm->fc->dont_mask) |
e0a43ddc MS |
830 | mode &= ~current_umask(); |
831 | ||
9e6268db MS |
832 | memset(&inarg, 0, sizeof(inarg)); |
833 | inarg.mode = mode; | |
e0a43ddc | 834 | inarg.umask = current_umask(); |
d5b48543 MS |
835 | args.opcode = FUSE_MKDIR; |
836 | args.in_numargs = 2; | |
837 | args.in_args[0].size = sizeof(inarg); | |
838 | args.in_args[0].value = &inarg; | |
839 | args.in_args[1].size = entry->d_name.len + 1; | |
840 | args.in_args[1].value = entry->d_name.name; | |
fcee216b | 841 | return create_new_entry(fm, &args, dir, entry, S_IFDIR); |
9e6268db MS |
842 | } |
843 | ||
7a77db95 | 844 | static int fuse_symlink(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 845 | struct dentry *entry, const char *link) |
9e6268db | 846 | { |
fcee216b | 847 | struct fuse_mount *fm = get_fuse_mount(dir); |
9e6268db | 848 | unsigned len = strlen(link) + 1; |
7078187a | 849 | FUSE_ARGS(args); |
9e6268db | 850 | |
d5b48543 MS |
851 | args.opcode = FUSE_SYMLINK; |
852 | args.in_numargs = 2; | |
853 | args.in_args[0].size = entry->d_name.len + 1; | |
854 | args.in_args[0].value = entry->d_name.name; | |
855 | args.in_args[1].size = len; | |
856 | args.in_args[1].value = link; | |
fcee216b | 857 | return create_new_entry(fm, &args, dir, entry, S_IFLNK); |
9e6268db MS |
858 | } |
859 | ||
5c791fe1 MS |
860 | void fuse_flush_time_update(struct inode *inode) |
861 | { | |
862 | int err = sync_inode_metadata(inode, 1); | |
863 | ||
864 | mapping_set_error(inode->i_mapping, err); | |
865 | } | |
866 | ||
97f044f6 | 867 | static void fuse_update_ctime_in_cache(struct inode *inode) |
31f3267b MP |
868 | { |
869 | if (!IS_NOCMTIME(inode)) { | |
c2050a45 | 870 | inode->i_ctime = current_time(inode); |
31f3267b | 871 | mark_inode_dirty_sync(inode); |
5c791fe1 | 872 | fuse_flush_time_update(inode); |
31f3267b MP |
873 | } |
874 | } | |
875 | ||
97f044f6 MS |
876 | void fuse_update_ctime(struct inode *inode) |
877 | { | |
fa5eee57 | 878 | fuse_invalidate_attr_mask(inode, STATX_CTIME); |
97f044f6 MS |
879 | fuse_update_ctime_in_cache(inode); |
880 | } | |
881 | ||
cefd1b83 MS |
882 | static void fuse_entry_unlinked(struct dentry *entry) |
883 | { | |
884 | struct inode *inode = d_inode(entry); | |
885 | struct fuse_conn *fc = get_fuse_conn(inode); | |
886 | struct fuse_inode *fi = get_fuse_inode(inode); | |
887 | ||
888 | spin_lock(&fi->lock); | |
889 | fi->attr_version = atomic64_inc_return(&fc->attr_version); | |
890 | /* | |
891 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
892 | * happen if userspace filesystem is careless. It would be | |
893 | * difficult to enforce correct nlink usage so just ignore this | |
894 | * condition here | |
895 | */ | |
896 | if (S_ISDIR(inode->i_mode)) | |
897 | clear_nlink(inode); | |
898 | else if (inode->i_nlink > 0) | |
899 | drop_nlink(inode); | |
900 | spin_unlock(&fi->lock); | |
901 | fuse_invalidate_entry_cache(entry); | |
902 | fuse_update_ctime(inode); | |
903 | } | |
904 | ||
9e6268db MS |
905 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
906 | { | |
907 | int err; | |
fcee216b | 908 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a MS |
909 | FUSE_ARGS(args); |
910 | ||
5d069dbe MS |
911 | if (fuse_is_bad(dir)) |
912 | return -EIO; | |
913 | ||
d5b48543 MS |
914 | args.opcode = FUSE_UNLINK; |
915 | args.nodeid = get_node_id(dir); | |
916 | args.in_numargs = 1; | |
917 | args.in_args[0].size = entry->d_name.len + 1; | |
918 | args.in_args[0].value = entry->d_name.name; | |
fcee216b | 919 | err = fuse_simple_request(fm, &args); |
9e6268db | 920 | if (!err) { |
261aaba7 | 921 | fuse_dir_changed(dir); |
cefd1b83 | 922 | fuse_entry_unlinked(entry); |
9e6268db MS |
923 | } else if (err == -EINTR) |
924 | fuse_invalidate_entry(entry); | |
925 | return err; | |
926 | } | |
927 | ||
928 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
929 | { | |
930 | int err; | |
fcee216b | 931 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a MS |
932 | FUSE_ARGS(args); |
933 | ||
5d069dbe MS |
934 | if (fuse_is_bad(dir)) |
935 | return -EIO; | |
936 | ||
d5b48543 MS |
937 | args.opcode = FUSE_RMDIR; |
938 | args.nodeid = get_node_id(dir); | |
939 | args.in_numargs = 1; | |
940 | args.in_args[0].size = entry->d_name.len + 1; | |
941 | args.in_args[0].value = entry->d_name.name; | |
fcee216b | 942 | err = fuse_simple_request(fm, &args); |
9e6268db | 943 | if (!err) { |
261aaba7 | 944 | fuse_dir_changed(dir); |
cefd1b83 | 945 | fuse_entry_unlinked(entry); |
9e6268db MS |
946 | } else if (err == -EINTR) |
947 | fuse_invalidate_entry(entry); | |
948 | return err; | |
949 | } | |
950 | ||
1560c974 MS |
951 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
952 | struct inode *newdir, struct dentry *newent, | |
953 | unsigned int flags, int opcode, size_t argsize) | |
9e6268db MS |
954 | { |
955 | int err; | |
1560c974 | 956 | struct fuse_rename2_in inarg; |
fcee216b | 957 | struct fuse_mount *fm = get_fuse_mount(olddir); |
7078187a | 958 | FUSE_ARGS(args); |
9e6268db | 959 | |
1560c974 | 960 | memset(&inarg, 0, argsize); |
9e6268db | 961 | inarg.newdir = get_node_id(newdir); |
1560c974 | 962 | inarg.flags = flags; |
d5b48543 MS |
963 | args.opcode = opcode; |
964 | args.nodeid = get_node_id(olddir); | |
965 | args.in_numargs = 3; | |
966 | args.in_args[0].size = argsize; | |
967 | args.in_args[0].value = &inarg; | |
968 | args.in_args[1].size = oldent->d_name.len + 1; | |
969 | args.in_args[1].value = oldent->d_name.name; | |
970 | args.in_args[2].size = newent->d_name.len + 1; | |
971 | args.in_args[2].value = newent->d_name.name; | |
fcee216b | 972 | err = fuse_simple_request(fm, &args); |
9e6268db | 973 | if (!err) { |
08b63307 | 974 | /* ctime changes */ |
2b0143b5 | 975 | fuse_update_ctime(d_inode(oldent)); |
08b63307 | 976 | |
371e8fd0 | 977 | if (flags & RENAME_EXCHANGE) |
2b0143b5 | 978 | fuse_update_ctime(d_inode(newent)); |
1560c974 | 979 | |
261aaba7 | 980 | fuse_dir_changed(olddir); |
9e6268db | 981 | if (olddir != newdir) |
261aaba7 | 982 | fuse_dir_changed(newdir); |
8cbdf1e6 MS |
983 | |
984 | /* newent will end up negative */ | |
cefd1b83 MS |
985 | if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) |
986 | fuse_entry_unlinked(newent); | |
9e6268db MS |
987 | } else if (err == -EINTR) { |
988 | /* If request was interrupted, DEITY only knows if the | |
989 | rename actually took place. If the invalidation | |
990 | fails (e.g. some process has CWD under the renamed | |
991 | directory), then there can be inconsistency between | |
992 | the dcache and the real filesystem. Tough luck. */ | |
993 | fuse_invalidate_entry(oldent); | |
2b0143b5 | 994 | if (d_really_is_positive(newent)) |
9e6268db MS |
995 | fuse_invalidate_entry(newent); |
996 | } | |
997 | ||
998 | return err; | |
999 | } | |
1000 | ||
549c7297 CB |
1001 | static int fuse_rename2(struct user_namespace *mnt_userns, struct inode *olddir, |
1002 | struct dentry *oldent, struct inode *newdir, | |
1003 | struct dentry *newent, unsigned int flags) | |
1560c974 MS |
1004 | { |
1005 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
1006 | int err; | |
1007 | ||
5d069dbe MS |
1008 | if (fuse_is_bad(olddir)) |
1009 | return -EIO; | |
1010 | ||
519525fa | 1011 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
1560c974 MS |
1012 | return -EINVAL; |
1013 | ||
4237ba43 MS |
1014 | if (flags) { |
1015 | if (fc->no_rename2 || fc->minor < 23) | |
1016 | return -EINVAL; | |
1560c974 | 1017 | |
4237ba43 MS |
1018 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, |
1019 | FUSE_RENAME2, | |
1020 | sizeof(struct fuse_rename2_in)); | |
1021 | if (err == -ENOSYS) { | |
1022 | fc->no_rename2 = 1; | |
1023 | err = -EINVAL; | |
1024 | } | |
1025 | } else { | |
1026 | err = fuse_rename_common(olddir, oldent, newdir, newent, 0, | |
1027 | FUSE_RENAME, | |
1028 | sizeof(struct fuse_rename_in)); | |
1560c974 | 1029 | } |
4237ba43 | 1030 | |
1560c974 | 1031 | return err; |
4237ba43 | 1032 | } |
1560c974 | 1033 | |
9e6268db MS |
1034 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
1035 | struct dentry *newent) | |
1036 | { | |
1037 | int err; | |
1038 | struct fuse_link_in inarg; | |
2b0143b5 | 1039 | struct inode *inode = d_inode(entry); |
fcee216b | 1040 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1041 | FUSE_ARGS(args); |
9e6268db MS |
1042 | |
1043 | memset(&inarg, 0, sizeof(inarg)); | |
1044 | inarg.oldnodeid = get_node_id(inode); | |
d5b48543 MS |
1045 | args.opcode = FUSE_LINK; |
1046 | args.in_numargs = 2; | |
1047 | args.in_args[0].size = sizeof(inarg); | |
1048 | args.in_args[0].value = &inarg; | |
1049 | args.in_args[1].size = newent->d_name.len + 1; | |
1050 | args.in_args[1].value = newent->d_name.name; | |
fcee216b | 1051 | err = create_new_entry(fm, &args, newdir, newent, inode->i_mode); |
97f044f6 MS |
1052 | if (!err) |
1053 | fuse_update_ctime_in_cache(inode); | |
1054 | else if (err == -EINTR) | |
ac45d613 | 1055 | fuse_invalidate_attr(inode); |
97f044f6 | 1056 | |
9e6268db MS |
1057 | return err; |
1058 | } | |
1059 | ||
1fb69e78 MS |
1060 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
1061 | struct kstat *stat) | |
1062 | { | |
203627bb | 1063 | unsigned int blkbits; |
8373200b PE |
1064 | struct fuse_conn *fc = get_fuse_conn(inode); |
1065 | ||
1fb69e78 MS |
1066 | stat->dev = inode->i_sb->s_dev; |
1067 | stat->ino = attr->ino; | |
1068 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
1069 | stat->nlink = attr->nlink; | |
8cb08329 EB |
1070 | stat->uid = make_kuid(fc->user_ns, attr->uid); |
1071 | stat->gid = make_kgid(fc->user_ns, attr->gid); | |
1fb69e78 MS |
1072 | stat->rdev = inode->i_rdev; |
1073 | stat->atime.tv_sec = attr->atime; | |
1074 | stat->atime.tv_nsec = attr->atimensec; | |
1075 | stat->mtime.tv_sec = attr->mtime; | |
1076 | stat->mtime.tv_nsec = attr->mtimensec; | |
1077 | stat->ctime.tv_sec = attr->ctime; | |
1078 | stat->ctime.tv_nsec = attr->ctimensec; | |
1079 | stat->size = attr->size; | |
1080 | stat->blocks = attr->blocks; | |
203627bb MS |
1081 | |
1082 | if (attr->blksize != 0) | |
1083 | blkbits = ilog2(attr->blksize); | |
1084 | else | |
1085 | blkbits = inode->i_sb->s_blocksize_bits; | |
1086 | ||
1087 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
1088 | } |
1089 | ||
c79e322f MS |
1090 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
1091 | struct file *file) | |
e5e5558e MS |
1092 | { |
1093 | int err; | |
c79e322f MS |
1094 | struct fuse_getattr_in inarg; |
1095 | struct fuse_attr_out outarg; | |
fcee216b | 1096 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1097 | FUSE_ARGS(args); |
1fb69e78 MS |
1098 | u64 attr_version; |
1099 | ||
fcee216b | 1100 | attr_version = fuse_get_attr_version(fm->fc); |
1fb69e78 | 1101 | |
c79e322f | 1102 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1103 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
1104 | /* Directories have separate file-handle space */ |
1105 | if (file && S_ISREG(inode->i_mode)) { | |
1106 | struct fuse_file *ff = file->private_data; | |
1107 | ||
1108 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
1109 | inarg.fh = ff->fh; | |
1110 | } | |
d5b48543 MS |
1111 | args.opcode = FUSE_GETATTR; |
1112 | args.nodeid = get_node_id(inode); | |
1113 | args.in_numargs = 1; | |
1114 | args.in_args[0].size = sizeof(inarg); | |
1115 | args.in_args[0].value = &inarg; | |
1116 | args.out_numargs = 1; | |
1117 | args.out_args[0].size = sizeof(outarg); | |
1118 | args.out_args[0].value = &outarg; | |
fcee216b | 1119 | err = fuse_simple_request(fm, &args); |
e5e5558e | 1120 | if (!err) { |
eb59bd17 | 1121 | if (fuse_invalid_attr(&outarg.attr) || |
6e3e2c43 | 1122 | inode_wrong_type(inode, outarg.attr.mode)) { |
5d069dbe | 1123 | fuse_make_bad(inode); |
e5e5558e MS |
1124 | err = -EIO; |
1125 | } else { | |
c79e322f MS |
1126 | fuse_change_attributes(inode, &outarg.attr, |
1127 | attr_timeout(&outarg), | |
1fb69e78 MS |
1128 | attr_version); |
1129 | if (stat) | |
c79e322f | 1130 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
1131 | } |
1132 | } | |
1133 | return err; | |
1134 | } | |
1135 | ||
5b97eeac | 1136 | static int fuse_update_get_attr(struct inode *inode, struct file *file, |
2f1e8196 MS |
1137 | struct kstat *stat, u32 request_mask, |
1138 | unsigned int flags) | |
bcb4be80 MS |
1139 | { |
1140 | struct fuse_inode *fi = get_fuse_inode(inode); | |
5b97eeac | 1141 | int err = 0; |
bf5c1898 | 1142 | bool sync; |
ec855375 MS |
1143 | u32 inval_mask = READ_ONCE(fi->inval_mask); |
1144 | u32 cache_mask = fuse_get_cache_mask(inode); | |
bcb4be80 | 1145 | |
bf5c1898 MS |
1146 | if (flags & AT_STATX_FORCE_SYNC) |
1147 | sync = true; | |
1148 | else if (flags & AT_STATX_DONT_SYNC) | |
1149 | sync = false; | |
ec855375 | 1150 | else if (request_mask & inval_mask & ~cache_mask) |
2f1e8196 | 1151 | sync = true; |
bf5c1898 MS |
1152 | else |
1153 | sync = time_before64(fi->i_time, get_jiffies_64()); | |
1154 | ||
1155 | if (sync) { | |
60bcc88a | 1156 | forget_all_cached_acls(inode); |
bcb4be80 | 1157 | err = fuse_do_getattr(inode, stat, file); |
5b97eeac | 1158 | } else if (stat) { |
b74d24f7 | 1159 | generic_fillattr(&nop_mnt_idmap, inode, stat); |
5b97eeac MS |
1160 | stat->mode = fi->orig_i_mode; |
1161 | stat->ino = fi->orig_ino; | |
bcb4be80 MS |
1162 | } |
1163 | ||
bcb4be80 MS |
1164 | return err; |
1165 | } | |
1166 | ||
c6c745b8 | 1167 | int fuse_update_attributes(struct inode *inode, struct file *file, u32 mask) |
5b97eeac | 1168 | { |
c6c745b8 | 1169 | return fuse_update_get_attr(inode, file, NULL, mask, 0); |
5b97eeac MS |
1170 | } |
1171 | ||
fcee216b | 1172 | int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid, |
4f8d3702 | 1173 | u64 child_nodeid, struct qstr *name, u32 flags) |
3b463ae0 JM |
1174 | { |
1175 | int err = -ENOTDIR; | |
1176 | struct inode *parent; | |
1177 | struct dentry *dir; | |
1178 | struct dentry *entry; | |
1179 | ||
fcee216b | 1180 | parent = fuse_ilookup(fc, parent_nodeid, NULL); |
3b463ae0 JM |
1181 | if (!parent) |
1182 | return -ENOENT; | |
1183 | ||
bda9a719 | 1184 | inode_lock_nested(parent, I_MUTEX_PARENT); |
3b463ae0 JM |
1185 | if (!S_ISDIR(parent->i_mode)) |
1186 | goto unlock; | |
1187 | ||
1188 | err = -ENOENT; | |
1189 | dir = d_find_alias(parent); | |
1190 | if (!dir) | |
1191 | goto unlock; | |
1192 | ||
8387ff25 | 1193 | name->hash = full_name_hash(dir, name->name, name->len); |
3b463ae0 JM |
1194 | entry = d_lookup(dir, name); |
1195 | dput(dir); | |
1196 | if (!entry) | |
1197 | goto unlock; | |
1198 | ||
261aaba7 | 1199 | fuse_dir_changed(parent); |
4f8d3702 MS |
1200 | if (!(flags & FUSE_EXPIRE_ONLY)) |
1201 | d_invalidate(entry); | |
1202 | fuse_invalidate_entry_cache(entry); | |
451d0f59 | 1203 | |
2b0143b5 | 1204 | if (child_nodeid != 0 && d_really_is_positive(entry)) { |
5955102c | 1205 | inode_lock(d_inode(entry)); |
2b0143b5 | 1206 | if (get_node_id(d_inode(entry)) != child_nodeid) { |
451d0f59 JM |
1207 | err = -ENOENT; |
1208 | goto badentry; | |
1209 | } | |
1210 | if (d_mountpoint(entry)) { | |
1211 | err = -EBUSY; | |
1212 | goto badentry; | |
1213 | } | |
e36cb0b8 | 1214 | if (d_is_dir(entry)) { |
451d0f59 JM |
1215 | shrink_dcache_parent(entry); |
1216 | if (!simple_empty(entry)) { | |
1217 | err = -ENOTEMPTY; | |
1218 | goto badentry; | |
1219 | } | |
2b0143b5 | 1220 | d_inode(entry)->i_flags |= S_DEAD; |
451d0f59 JM |
1221 | } |
1222 | dont_mount(entry); | |
2b0143b5 | 1223 | clear_nlink(d_inode(entry)); |
451d0f59 JM |
1224 | err = 0; |
1225 | badentry: | |
5955102c | 1226 | inode_unlock(d_inode(entry)); |
451d0f59 JM |
1227 | if (!err) |
1228 | d_delete(entry); | |
1229 | } else { | |
1230 | err = 0; | |
1231 | } | |
3b463ae0 | 1232 | dput(entry); |
3b463ae0 JM |
1233 | |
1234 | unlock: | |
5955102c | 1235 | inode_unlock(parent); |
3b463ae0 JM |
1236 | iput(parent); |
1237 | return err; | |
1238 | } | |
1239 | ||
b1387777 DM |
1240 | static inline bool fuse_permissible_uidgid(struct fuse_conn *fc) |
1241 | { | |
1242 | const struct cred *cred = current_cred(); | |
1243 | ||
1244 | return (uid_eq(cred->euid, fc->user_id) && | |
1245 | uid_eq(cred->suid, fc->user_id) && | |
1246 | uid_eq(cred->uid, fc->user_id) && | |
1247 | gid_eq(cred->egid, fc->group_id) && | |
1248 | gid_eq(cred->sgid, fc->group_id) && | |
1249 | gid_eq(cred->gid, fc->group_id)); | |
1250 | } | |
1251 | ||
87729a55 MS |
1252 | /* |
1253 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1254 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1255 | * means, that the filesystem daemon is able to record the exact |
1256 | * filesystem operations performed, and can also control the behavior | |
1257 | * of the requester process in otherwise impossible ways. For example | |
1258 | * it can delay the operation for arbitrary length of time allowing | |
1259 | * DoS against the requester. | |
1260 | * | |
1261 | * For this reason only those processes can call into the filesystem, | |
1262 | * for which the owner of the mount has ptrace privilege. This | |
1263 | * excludes processes started by other users, suid or sgid processes. | |
1264 | */ | |
b1387777 | 1265 | bool fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1266 | { |
b1387777 | 1267 | bool allow; |
9ccf47b2 | 1268 | |
29433a29 | 1269 | if (fc->allow_other) |
b1387777 DM |
1270 | allow = current_in_userns(fc->user_ns); |
1271 | else | |
1272 | allow = fuse_permissible_uidgid(fc); | |
87729a55 | 1273 | |
b1387777 DM |
1274 | if (!allow && allow_sys_admin_access && capable(CAP_SYS_ADMIN)) |
1275 | allow = true; | |
c69e8d9c | 1276 | |
b1387777 | 1277 | return allow; |
87729a55 MS |
1278 | } |
1279 | ||
31d40d74 MS |
1280 | static int fuse_access(struct inode *inode, int mask) |
1281 | { | |
fcee216b | 1282 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1283 | FUSE_ARGS(args); |
31d40d74 MS |
1284 | struct fuse_access_in inarg; |
1285 | int err; | |
1286 | ||
698fa1d1 MS |
1287 | BUG_ON(mask & MAY_NOT_BLOCK); |
1288 | ||
fcee216b | 1289 | if (fm->fc->no_access) |
31d40d74 MS |
1290 | return 0; |
1291 | ||
31d40d74 | 1292 | memset(&inarg, 0, sizeof(inarg)); |
e6305c43 | 1293 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
d5b48543 MS |
1294 | args.opcode = FUSE_ACCESS; |
1295 | args.nodeid = get_node_id(inode); | |
1296 | args.in_numargs = 1; | |
1297 | args.in_args[0].size = sizeof(inarg); | |
1298 | args.in_args[0].value = &inarg; | |
fcee216b | 1299 | err = fuse_simple_request(fm, &args); |
31d40d74 | 1300 | if (err == -ENOSYS) { |
fcee216b | 1301 | fm->fc->no_access = 1; |
31d40d74 MS |
1302 | err = 0; |
1303 | } | |
1304 | return err; | |
1305 | } | |
1306 | ||
10556cb2 | 1307 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1308 | { |
10556cb2 | 1309 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1310 | return -ECHILD; |
1311 | ||
60bcc88a | 1312 | forget_all_cached_acls(inode); |
19690ddb MS |
1313 | return fuse_do_getattr(inode, NULL, NULL); |
1314 | } | |
1315 | ||
6f9f1180 MS |
1316 | /* |
1317 | * Check permission. The two basic access models of FUSE are: | |
1318 | * | |
1319 | * 1) Local access checking ('default_permissions' mount option) based | |
1320 | * on file mode. This is the plain old disk filesystem permission | |
1321 | * modell. | |
1322 | * | |
1323 | * 2) "Remote" access checking, where server is responsible for | |
1324 | * checking permission in each inode operation. An exception to this | |
1325 | * is if ->permission() was invoked from sys_access() in which case an | |
1326 | * access request is sent. Execute permission is still checked | |
1327 | * locally based on file mode. | |
1328 | */ | |
549c7297 CB |
1329 | static int fuse_permission(struct user_namespace *mnt_userns, |
1330 | struct inode *inode, int mask) | |
e5e5558e MS |
1331 | { |
1332 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1333 | bool refreshed = false; |
1334 | int err = 0; | |
e5e5558e | 1335 | |
5d069dbe MS |
1336 | if (fuse_is_bad(inode)) |
1337 | return -EIO; | |
1338 | ||
c2132c1b | 1339 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1340 | return -EACCES; |
244f6385 MS |
1341 | |
1342 | /* | |
e8e96157 | 1343 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1344 | */ |
29433a29 | 1345 | if (fc->default_permissions || |
e8e96157 | 1346 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { |
19690ddb | 1347 | struct fuse_inode *fi = get_fuse_inode(inode); |
d233c7dd | 1348 | u32 perm_mask = STATX_MODE | STATX_UID | STATX_GID; |
19690ddb | 1349 | |
d233c7dd MS |
1350 | if (perm_mask & READ_ONCE(fi->inval_mask) || |
1351 | time_before64(fi->i_time, get_jiffies_64())) { | |
19690ddb MS |
1352 | refreshed = true; |
1353 | ||
10556cb2 | 1354 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1355 | if (err) |
1356 | return err; | |
1357 | } | |
244f6385 MS |
1358 | } |
1359 | ||
29433a29 | 1360 | if (fc->default_permissions) { |
47291baa | 1361 | err = generic_permission(&init_user_ns, inode, mask); |
1e9a4ed9 MS |
1362 | |
1363 | /* If permission is denied, try to refresh file | |
1364 | attributes. This is also needed, because the root | |
1365 | node will at first have no permissions */ | |
244f6385 | 1366 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1367 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1368 | if (!err) |
47291baa CB |
1369 | err = generic_permission(&init_user_ns, |
1370 | inode, mask); | |
1e9a4ed9 MS |
1371 | } |
1372 | ||
6f9f1180 MS |
1373 | /* Note: the opposite of the above test does not |
1374 | exist. So if permissions are revoked this won't be | |
1375 | noticed immediately, only after the attribute | |
1376 | timeout has expired */ | |
9cfcac81 | 1377 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1378 | err = fuse_access(inode, mask); |
1379 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1380 | if (!(inode->i_mode & S_IXUGO)) { | |
1381 | if (refreshed) | |
1382 | return -EACCES; | |
1383 | ||
10556cb2 | 1384 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1385 | if (!err && !(inode->i_mode & S_IXUGO)) |
1386 | return -EACCES; | |
1387 | } | |
e5e5558e | 1388 | } |
244f6385 | 1389 | return err; |
e5e5558e MS |
1390 | } |
1391 | ||
5571f1e6 | 1392 | static int fuse_readlink_page(struct inode *inode, struct page *page) |
e5e5558e | 1393 | { |
fcee216b | 1394 | struct fuse_mount *fm = get_fuse_mount(inode); |
4c29afec MS |
1395 | struct fuse_page_desc desc = { .length = PAGE_SIZE - 1 }; |
1396 | struct fuse_args_pages ap = { | |
1397 | .num_pages = 1, | |
1398 | .pages = &page, | |
1399 | .descs = &desc, | |
1400 | }; | |
1401 | char *link; | |
1402 | ssize_t res; | |
1403 | ||
1404 | ap.args.opcode = FUSE_READLINK; | |
1405 | ap.args.nodeid = get_node_id(inode); | |
1406 | ap.args.out_pages = true; | |
1407 | ap.args.out_argvar = true; | |
1408 | ap.args.page_zeroing = true; | |
1409 | ap.args.out_numargs = 1; | |
1410 | ap.args.out_args[0].size = desc.length; | |
fcee216b | 1411 | res = fuse_simple_request(fm, &ap.args); |
e5e5558e | 1412 | |
4c29afec | 1413 | fuse_invalidate_atime(inode); |
6b255391 | 1414 | |
4c29afec MS |
1415 | if (res < 0) |
1416 | return res; | |
7078187a | 1417 | |
4c29afec MS |
1418 | if (WARN_ON(res >= PAGE_SIZE)) |
1419 | return -EIO; | |
5571f1e6 | 1420 | |
4c29afec MS |
1421 | link = page_address(page); |
1422 | link[res] = '\0'; | |
5571f1e6 | 1423 | |
4c29afec | 1424 | return 0; |
5571f1e6 DS |
1425 | } |
1426 | ||
1427 | static const char *fuse_get_link(struct dentry *dentry, struct inode *inode, | |
1428 | struct delayed_call *callback) | |
1429 | { | |
1430 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1431 | struct page *page; | |
1432 | int err; | |
1433 | ||
1434 | err = -EIO; | |
5d069dbe | 1435 | if (fuse_is_bad(inode)) |
5571f1e6 DS |
1436 | goto out_err; |
1437 | ||
1438 | if (fc->cache_symlinks) | |
1439 | return page_get_link(dentry, inode, callback); | |
1440 | ||
1441 | err = -ECHILD; | |
1442 | if (!dentry) | |
1443 | goto out_err; | |
1444 | ||
1445 | page = alloc_page(GFP_KERNEL); | |
1446 | err = -ENOMEM; | |
1447 | if (!page) | |
1448 | goto out_err; | |
1449 | ||
1450 | err = fuse_readlink_page(inode, page); | |
1451 | if (err) { | |
1452 | __free_page(page); | |
1453 | goto out_err; | |
1454 | } | |
1455 | ||
1456 | set_delayed_call(callback, page_put_link, page); | |
1457 | ||
1458 | return page_address(page); | |
1459 | ||
1460 | out_err: | |
1461 | return ERR_PTR(err); | |
e5e5558e MS |
1462 | } |
1463 | ||
e5e5558e MS |
1464 | static int fuse_dir_open(struct inode *inode, struct file *file) |
1465 | { | |
91fe96b4 | 1466 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1467 | } |
1468 | ||
1469 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1470 | { | |
2e64ff15 | 1471 | fuse_release_common(file, true); |
8b0797a4 MS |
1472 | |
1473 | return 0; | |
e5e5558e MS |
1474 | } |
1475 | ||
02c24a82 JB |
1476 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1477 | int datasync) | |
82547981 | 1478 | { |
a9c2d1e8 MS |
1479 | struct inode *inode = file->f_mapping->host; |
1480 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1481 | int err; | |
1482 | ||
5d069dbe | 1483 | if (fuse_is_bad(inode)) |
a9c2d1e8 MS |
1484 | return -EIO; |
1485 | ||
1486 | if (fc->no_fsyncdir) | |
1487 | return 0; | |
1488 | ||
1489 | inode_lock(inode); | |
1490 | err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNCDIR); | |
1491 | if (err == -ENOSYS) { | |
1492 | fc->no_fsyncdir = 1; | |
1493 | err = 0; | |
1494 | } | |
1495 | inode_unlock(inode); | |
1496 | ||
1497 | return err; | |
82547981 MS |
1498 | } |
1499 | ||
b18da0c5 MS |
1500 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1501 | unsigned long arg) | |
1502 | { | |
1503 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1504 | ||
1505 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1506 | if (fc->minor < 18) | |
1507 | return -ENOTTY; | |
1508 | ||
1509 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1510 | } | |
1511 | ||
1512 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1513 | unsigned long arg) | |
1514 | { | |
1515 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1516 | ||
1517 | if (fc->minor < 18) | |
1518 | return -ENOTTY; | |
1519 | ||
1520 | return fuse_ioctl_common(file, cmd, arg, | |
1521 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1522 | } | |
1523 | ||
b0aa7606 | 1524 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
17637cba MS |
1525 | { |
1526 | /* Always update if mtime is explicitly set */ | |
1527 | if (ivalid & ATTR_MTIME_SET) | |
1528 | return true; | |
1529 | ||
b0aa7606 MP |
1530 | /* Or if kernel i_mtime is the official one */ |
1531 | if (trust_local_mtime) | |
1532 | return true; | |
1533 | ||
17637cba MS |
1534 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
1535 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1536 | return false; | |
1537 | ||
1538 | /* In all other cases update */ | |
1539 | return true; | |
1540 | } | |
1541 | ||
8cb08329 EB |
1542 | static void iattr_to_fattr(struct fuse_conn *fc, struct iattr *iattr, |
1543 | struct fuse_setattr_in *arg, bool trust_local_cmtime) | |
9e6268db MS |
1544 | { |
1545 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1546 | |
1547 | if (ivalid & ATTR_MODE) | |
befc649c | 1548 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1549 | if (ivalid & ATTR_UID) |
8cb08329 | 1550 | arg->valid |= FATTR_UID, arg->uid = from_kuid(fc->user_ns, iattr->ia_uid); |
9e6268db | 1551 | if (ivalid & ATTR_GID) |
8cb08329 | 1552 | arg->valid |= FATTR_GID, arg->gid = from_kgid(fc->user_ns, iattr->ia_gid); |
9e6268db | 1553 | if (ivalid & ATTR_SIZE) |
befc649c | 1554 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1555 | if (ivalid & ATTR_ATIME) { |
1556 | arg->valid |= FATTR_ATIME; | |
befc649c | 1557 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1558 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1559 | if (!(ivalid & ATTR_ATIME_SET)) | |
1560 | arg->valid |= FATTR_ATIME_NOW; | |
1561 | } | |
3ad22c62 | 1562 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
17637cba | 1563 | arg->valid |= FATTR_MTIME; |
befc649c | 1564 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba | 1565 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
3ad22c62 | 1566 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
17637cba | 1567 | arg->valid |= FATTR_MTIME_NOW; |
befc649c | 1568 | } |
3ad22c62 MP |
1569 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
1570 | arg->valid |= FATTR_CTIME; | |
1571 | arg->ctime = iattr->ia_ctime.tv_sec; | |
1572 | arg->ctimensec = iattr->ia_ctime.tv_nsec; | |
1573 | } | |
9e6268db MS |
1574 | } |
1575 | ||
3be5a52b MS |
1576 | /* |
1577 | * Prevent concurrent writepages on inode | |
1578 | * | |
1579 | * This is done by adding a negative bias to the inode write counter | |
1580 | * and waiting for all pending writes to finish. | |
1581 | */ | |
1582 | void fuse_set_nowrite(struct inode *inode) | |
1583 | { | |
3be5a52b MS |
1584 | struct fuse_inode *fi = get_fuse_inode(inode); |
1585 | ||
5955102c | 1586 | BUG_ON(!inode_is_locked(inode)); |
3be5a52b | 1587 | |
f15ecfef | 1588 | spin_lock(&fi->lock); |
3be5a52b MS |
1589 | BUG_ON(fi->writectr < 0); |
1590 | fi->writectr += FUSE_NOWRITE; | |
f15ecfef | 1591 | spin_unlock(&fi->lock); |
3be5a52b MS |
1592 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * Allow writepages on inode | |
1597 | * | |
1598 | * Remove the bias from the writecounter and send any queued | |
1599 | * writepages. | |
1600 | */ | |
1601 | static void __fuse_release_nowrite(struct inode *inode) | |
1602 | { | |
1603 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1604 | ||
1605 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1606 | fi->writectr = 0; | |
1607 | fuse_flush_writepages(inode); | |
1608 | } | |
1609 | ||
1610 | void fuse_release_nowrite(struct inode *inode) | |
1611 | { | |
f15ecfef | 1612 | struct fuse_inode *fi = get_fuse_inode(inode); |
3be5a52b | 1613 | |
f15ecfef | 1614 | spin_lock(&fi->lock); |
3be5a52b | 1615 | __fuse_release_nowrite(inode); |
f15ecfef | 1616 | spin_unlock(&fi->lock); |
3be5a52b MS |
1617 | } |
1618 | ||
7078187a | 1619 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args, |
b0aa7606 MP |
1620 | struct inode *inode, |
1621 | struct fuse_setattr_in *inarg_p, | |
1622 | struct fuse_attr_out *outarg_p) | |
1623 | { | |
d5b48543 MS |
1624 | args->opcode = FUSE_SETATTR; |
1625 | args->nodeid = get_node_id(inode); | |
1626 | args->in_numargs = 1; | |
1627 | args->in_args[0].size = sizeof(*inarg_p); | |
1628 | args->in_args[0].value = inarg_p; | |
1629 | args->out_numargs = 1; | |
1630 | args->out_args[0].size = sizeof(*outarg_p); | |
1631 | args->out_args[0].value = outarg_p; | |
b0aa7606 MP |
1632 | } |
1633 | ||
1634 | /* | |
1635 | * Flush inode->i_mtime to the server | |
1636 | */ | |
ab9e13f7 | 1637 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
b0aa7606 | 1638 | { |
fcee216b | 1639 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1640 | FUSE_ARGS(args); |
b0aa7606 MP |
1641 | struct fuse_setattr_in inarg; |
1642 | struct fuse_attr_out outarg; | |
b0aa7606 MP |
1643 | |
1644 | memset(&inarg, 0, sizeof(inarg)); | |
1645 | memset(&outarg, 0, sizeof(outarg)); | |
1646 | ||
ab9e13f7 | 1647 | inarg.valid = FATTR_MTIME; |
b0aa7606 MP |
1648 | inarg.mtime = inode->i_mtime.tv_sec; |
1649 | inarg.mtimensec = inode->i_mtime.tv_nsec; | |
fcee216b | 1650 | if (fm->fc->minor >= 23) { |
ab9e13f7 MP |
1651 | inarg.valid |= FATTR_CTIME; |
1652 | inarg.ctime = inode->i_ctime.tv_sec; | |
1653 | inarg.ctimensec = inode->i_ctime.tv_nsec; | |
1654 | } | |
1e18bda8 MS |
1655 | if (ff) { |
1656 | inarg.valid |= FATTR_FH; | |
1657 | inarg.fh = ff->fh; | |
1658 | } | |
fcee216b | 1659 | fuse_setattr_fill(fm->fc, &args, inode, &inarg, &outarg); |
b0aa7606 | 1660 | |
fcee216b | 1661 | return fuse_simple_request(fm, &args); |
b0aa7606 MP |
1662 | } |
1663 | ||
6f9f1180 MS |
1664 | /* |
1665 | * Set attributes, and at the same time refresh them. | |
1666 | * | |
1667 | * Truncation is slightly complicated, because the 'truncate' request | |
1668 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1669 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1670 | * and the actual truncation by hand. | |
6f9f1180 | 1671 | */ |
62490330 | 1672 | int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, |
efb9fa9e | 1673 | struct file *file) |
9e6268db | 1674 | { |
62490330 | 1675 | struct inode *inode = d_inode(dentry); |
fcee216b MR |
1676 | struct fuse_mount *fm = get_fuse_mount(inode); |
1677 | struct fuse_conn *fc = fm->fc; | |
06a7c3c2 | 1678 | struct fuse_inode *fi = get_fuse_inode(inode); |
8bcbbe9c | 1679 | struct address_space *mapping = inode->i_mapping; |
7078187a | 1680 | FUSE_ARGS(args); |
9e6268db MS |
1681 | struct fuse_setattr_in inarg; |
1682 | struct fuse_attr_out outarg; | |
3be5a52b | 1683 | bool is_truncate = false; |
c15016b7 | 1684 | bool is_wb = fc->writeback_cache && S_ISREG(inode->i_mode); |
3be5a52b | 1685 | loff_t oldsize; |
9e6268db | 1686 | int err; |
c15016b7 | 1687 | bool trust_local_cmtime = is_wb; |
6ae330ca | 1688 | bool fault_blocked = false; |
9e6268db | 1689 | |
29433a29 | 1690 | if (!fc->default_permissions) |
db78b877 CH |
1691 | attr->ia_valid |= ATTR_FORCE; |
1692 | ||
c1632a0f | 1693 | err = setattr_prepare(&nop_mnt_idmap, dentry, attr); |
db78b877 CH |
1694 | if (err) |
1695 | return err; | |
1e9a4ed9 | 1696 | |
6ae330ca VG |
1697 | if (attr->ia_valid & ATTR_SIZE) { |
1698 | if (WARN_ON(!S_ISREG(inode->i_mode))) | |
1699 | return -EIO; | |
1700 | is_truncate = true; | |
1701 | } | |
1702 | ||
1703 | if (FUSE_IS_DAX(inode) && is_truncate) { | |
8bcbbe9c | 1704 | filemap_invalidate_lock(mapping); |
6ae330ca VG |
1705 | fault_blocked = true; |
1706 | err = fuse_dax_break_layouts(inode, 0, 0); | |
1707 | if (err) { | |
8bcbbe9c | 1708 | filemap_invalidate_unlock(mapping); |
6ae330ca VG |
1709 | return err; |
1710 | } | |
1711 | } | |
1712 | ||
8d56addd | 1713 | if (attr->ia_valid & ATTR_OPEN) { |
df0e91d4 MS |
1714 | /* This is coming from open(..., ... | O_TRUNC); */ |
1715 | WARN_ON(!(attr->ia_valid & ATTR_SIZE)); | |
1716 | WARN_ON(attr->ia_size != 0); | |
1717 | if (fc->atomic_o_trunc) { | |
1718 | /* | |
1719 | * No need to send request to userspace, since actual | |
1720 | * truncation has already been done by OPEN. But still | |
1721 | * need to truncate page cache. | |
1722 | */ | |
1723 | i_size_write(inode, 0); | |
1724 | truncate_pagecache(inode, 0); | |
6ae330ca | 1725 | goto out; |
df0e91d4 | 1726 | } |
8d56addd MS |
1727 | file = NULL; |
1728 | } | |
6ff958ed | 1729 | |
b24e7598 | 1730 | /* Flush dirty data/metadata before non-truncate SETATTR */ |
c15016b7 | 1731 | if (is_wb && |
b24e7598 MS |
1732 | attr->ia_valid & |
1733 | (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_MTIME_SET | | |
1734 | ATTR_TIMES_SET)) { | |
1735 | err = write_inode_now(inode, true); | |
1736 | if (err) | |
1737 | return err; | |
1738 | ||
1739 | fuse_set_nowrite(inode); | |
1740 | fuse_release_nowrite(inode); | |
1741 | } | |
1742 | ||
06a7c3c2 | 1743 | if (is_truncate) { |
3be5a52b | 1744 | fuse_set_nowrite(inode); |
06a7c3c2 | 1745 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3ad22c62 MP |
1746 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
1747 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; | |
06a7c3c2 | 1748 | } |
3be5a52b | 1749 | |
9e6268db | 1750 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1751 | memset(&outarg, 0, sizeof(outarg)); |
8cb08329 | 1752 | iattr_to_fattr(fc, attr, &inarg, trust_local_cmtime); |
49d4914f MS |
1753 | if (file) { |
1754 | struct fuse_file *ff = file->private_data; | |
1755 | inarg.valid |= FATTR_FH; | |
1756 | inarg.fh = ff->fh; | |
1757 | } | |
31792161 VG |
1758 | |
1759 | /* Kill suid/sgid for non-directory chown unconditionally */ | |
1760 | if (fc->handle_killpriv_v2 && !S_ISDIR(inode->i_mode) && | |
1761 | attr->ia_valid & (ATTR_UID | ATTR_GID)) | |
1762 | inarg.valid |= FATTR_KILL_SUIDGID; | |
1763 | ||
f3332114 MS |
1764 | if (attr->ia_valid & ATTR_SIZE) { |
1765 | /* For mandatory locking in truncate */ | |
1766 | inarg.valid |= FATTR_LOCKOWNER; | |
1767 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
31792161 VG |
1768 | |
1769 | /* Kill suid/sgid for truncate only if no CAP_FSETID */ | |
1770 | if (fc->handle_killpriv_v2 && !capable(CAP_FSETID)) | |
1771 | inarg.valid |= FATTR_KILL_SUIDGID; | |
f3332114 | 1772 | } |
7078187a | 1773 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
fcee216b | 1774 | err = fuse_simple_request(fm, &args); |
e00d2c2d MS |
1775 | if (err) { |
1776 | if (err == -EINTR) | |
1777 | fuse_invalidate_attr(inode); | |
3be5a52b | 1778 | goto error; |
e00d2c2d | 1779 | } |
9e6268db | 1780 | |
eb59bd17 | 1781 | if (fuse_invalid_attr(&outarg.attr) || |
6e3e2c43 | 1782 | inode_wrong_type(inode, outarg.attr.mode)) { |
5d069dbe | 1783 | fuse_make_bad(inode); |
3be5a52b MS |
1784 | err = -EIO; |
1785 | goto error; | |
1786 | } | |
1787 | ||
f15ecfef | 1788 | spin_lock(&fi->lock); |
b0aa7606 | 1789 | /* the kernel maintains i_mtime locally */ |
3ad22c62 MP |
1790 | if (trust_local_cmtime) { |
1791 | if (attr->ia_valid & ATTR_MTIME) | |
1792 | inode->i_mtime = attr->ia_mtime; | |
1793 | if (attr->ia_valid & ATTR_CTIME) | |
1794 | inode->i_ctime = attr->ia_ctime; | |
1e18bda8 | 1795 | /* FIXME: clear I_DIRTY_SYNC? */ |
b0aa7606 MP |
1796 | } |
1797 | ||
3be5a52b | 1798 | fuse_change_attributes_common(inode, &outarg.attr, |
4b52f059 MS |
1799 | attr_timeout(&outarg), |
1800 | fuse_get_cache_mask(inode)); | |
3be5a52b | 1801 | oldsize = inode->i_size; |
8373200b | 1802 | /* see the comment in fuse_change_attributes() */ |
c15016b7 | 1803 | if (!is_wb || is_truncate) |
8373200b | 1804 | i_size_write(inode, outarg.attr.size); |
3be5a52b MS |
1805 | |
1806 | if (is_truncate) { | |
f15ecfef | 1807 | /* NOTE: this may release/reacquire fi->lock */ |
3be5a52b MS |
1808 | __fuse_release_nowrite(inode); |
1809 | } | |
f15ecfef | 1810 | spin_unlock(&fi->lock); |
3be5a52b MS |
1811 | |
1812 | /* | |
1813 | * Only call invalidate_inode_pages2() after removing | |
2bf06b8e | 1814 | * FUSE_NOWRITE, otherwise fuse_launder_folio() would deadlock. |
3be5a52b | 1815 | */ |
8373200b PE |
1816 | if ((is_truncate || !is_wb) && |
1817 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1818 | truncate_pagecache(inode, outarg.attr.size); |
8bcbbe9c | 1819 | invalidate_inode_pages2(mapping); |
e00d2c2d MS |
1820 | } |
1821 | ||
06a7c3c2 | 1822 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
6ae330ca VG |
1823 | out: |
1824 | if (fault_blocked) | |
8bcbbe9c | 1825 | filemap_invalidate_unlock(mapping); |
6ae330ca | 1826 | |
e00d2c2d | 1827 | return 0; |
3be5a52b MS |
1828 | |
1829 | error: | |
1830 | if (is_truncate) | |
1831 | fuse_release_nowrite(inode); | |
1832 | ||
06a7c3c2 | 1833 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
6ae330ca VG |
1834 | |
1835 | if (fault_blocked) | |
8bcbbe9c | 1836 | filemap_invalidate_unlock(mapping); |
3be5a52b | 1837 | return err; |
9e6268db MS |
1838 | } |
1839 | ||
c1632a0f | 1840 | static int fuse_setattr(struct mnt_idmap *idmap, struct dentry *entry, |
549c7297 | 1841 | struct iattr *attr) |
49d4914f | 1842 | { |
2b0143b5 | 1843 | struct inode *inode = d_inode(entry); |
5e940c1d | 1844 | struct fuse_conn *fc = get_fuse_conn(inode); |
a09f99ed | 1845 | struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL; |
5e2b8828 | 1846 | int ret; |
efb9fa9e | 1847 | |
5d069dbe MS |
1848 | if (fuse_is_bad(inode)) |
1849 | return -EIO; | |
1850 | ||
efb9fa9e MP |
1851 | if (!fuse_allow_current_process(get_fuse_conn(inode))) |
1852 | return -EACCES; | |
1853 | ||
a09f99ed | 1854 | if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) { |
a09f99ed MS |
1855 | attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | |
1856 | ATTR_MODE); | |
5e940c1d | 1857 | |
a09f99ed | 1858 | /* |
5e940c1d MS |
1859 | * The only sane way to reliably kill suid/sgid is to do it in |
1860 | * the userspace filesystem | |
1861 | * | |
1862 | * This should be done on write(), truncate() and chown(). | |
a09f99ed | 1863 | */ |
8981bdfd | 1864 | if (!fc->handle_killpriv && !fc->handle_killpriv_v2) { |
5e940c1d MS |
1865 | /* |
1866 | * ia_mode calculation may have used stale i_mode. | |
1867 | * Refresh and recalculate. | |
1868 | */ | |
1869 | ret = fuse_do_getattr(inode, NULL, file); | |
1870 | if (ret) | |
1871 | return ret; | |
1872 | ||
1873 | attr->ia_mode = inode->i_mode; | |
c01638f5 | 1874 | if (inode->i_mode & S_ISUID) { |
5e940c1d MS |
1875 | attr->ia_valid |= ATTR_MODE; |
1876 | attr->ia_mode &= ~S_ISUID; | |
1877 | } | |
c01638f5 | 1878 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { |
5e940c1d MS |
1879 | attr->ia_valid |= ATTR_MODE; |
1880 | attr->ia_mode &= ~S_ISGID; | |
1881 | } | |
a09f99ed MS |
1882 | } |
1883 | } | |
1884 | if (!attr->ia_valid) | |
1885 | return 0; | |
5e2b8828 | 1886 | |
abb5a14f | 1887 | ret = fuse_do_setattr(entry, attr, file); |
5e2b8828 | 1888 | if (!ret) { |
60bcc88a SF |
1889 | /* |
1890 | * If filesystem supports acls it may have updated acl xattrs in | |
1891 | * the filesystem, so forget cached acls for the inode. | |
1892 | */ | |
1893 | if (fc->posix_acl) | |
1894 | forget_all_cached_acls(inode); | |
1895 | ||
5e2b8828 MS |
1896 | /* Directory mode changed, may need to revalidate access */ |
1897 | if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE)) | |
1898 | fuse_invalidate_entry_cache(entry); | |
1899 | } | |
1900 | return ret; | |
49d4914f MS |
1901 | } |
1902 | ||
b74d24f7 | 1903 | static int fuse_getattr(struct mnt_idmap *idmap, |
549c7297 | 1904 | const struct path *path, struct kstat *stat, |
a528d35e | 1905 | u32 request_mask, unsigned int flags) |
e5e5558e | 1906 | { |
a528d35e | 1907 | struct inode *inode = d_inode(path->dentry); |
244f6385 | 1908 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1909 | |
5d069dbe MS |
1910 | if (fuse_is_bad(inode)) |
1911 | return -EIO; | |
1912 | ||
5157da2c MS |
1913 | if (!fuse_allow_current_process(fc)) { |
1914 | if (!request_mask) { | |
1915 | /* | |
1916 | * If user explicitly requested *nothing* then don't | |
1917 | * error out, but return st_dev only. | |
1918 | */ | |
1919 | stat->result_mask = 0; | |
1920 | stat->dev = inode->i_sb->s_dev; | |
1921 | return 0; | |
1922 | } | |
244f6385 | 1923 | return -EACCES; |
5157da2c | 1924 | } |
244f6385 | 1925 | |
2f1e8196 | 1926 | return fuse_update_get_attr(inode, NULL, stat, request_mask, flags); |
e5e5558e MS |
1927 | } |
1928 | ||
754661f1 | 1929 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1930 | .lookup = fuse_lookup, |
9e6268db MS |
1931 | .mkdir = fuse_mkdir, |
1932 | .symlink = fuse_symlink, | |
1933 | .unlink = fuse_unlink, | |
1934 | .rmdir = fuse_rmdir, | |
2773bf00 | 1935 | .rename = fuse_rename2, |
9e6268db MS |
1936 | .link = fuse_link, |
1937 | .setattr = fuse_setattr, | |
1938 | .create = fuse_create, | |
c8ccbe03 | 1939 | .atomic_open = fuse_atomic_open, |
7d375390 | 1940 | .tmpfile = fuse_tmpfile, |
9e6268db | 1941 | .mknod = fuse_mknod, |
e5e5558e MS |
1942 | .permission = fuse_permission, |
1943 | .getattr = fuse_getattr, | |
92a8780e | 1944 | .listxattr = fuse_listxattr, |
cac2f8b8 | 1945 | .get_inode_acl = fuse_get_acl, |
60bcc88a | 1946 | .set_acl = fuse_set_acl, |
72227eac MS |
1947 | .fileattr_get = fuse_fileattr_get, |
1948 | .fileattr_set = fuse_fileattr_set, | |
e5e5558e MS |
1949 | }; |
1950 | ||
4b6f5d20 | 1951 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1952 | .llseek = generic_file_llseek, |
e5e5558e | 1953 | .read = generic_read_dir, |
d9b3dbdc | 1954 | .iterate_shared = fuse_readdir, |
e5e5558e MS |
1955 | .open = fuse_dir_open, |
1956 | .release = fuse_dir_release, | |
82547981 | 1957 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1958 | .unlocked_ioctl = fuse_dir_ioctl, |
1959 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1960 | }; |
1961 | ||
754661f1 | 1962 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1963 | .setattr = fuse_setattr, |
e5e5558e MS |
1964 | .permission = fuse_permission, |
1965 | .getattr = fuse_getattr, | |
92a8780e | 1966 | .listxattr = fuse_listxattr, |
cac2f8b8 | 1967 | .get_inode_acl = fuse_get_acl, |
60bcc88a | 1968 | .set_acl = fuse_set_acl, |
72227eac MS |
1969 | .fileattr_get = fuse_fileattr_get, |
1970 | .fileattr_set = fuse_fileattr_set, | |
e5e5558e MS |
1971 | }; |
1972 | ||
754661f1 | 1973 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1974 | .setattr = fuse_setattr, |
6b255391 | 1975 | .get_link = fuse_get_link, |
e5e5558e | 1976 | .getattr = fuse_getattr, |
92a8780e | 1977 | .listxattr = fuse_listxattr, |
e5e5558e MS |
1978 | }; |
1979 | ||
1980 | void fuse_init_common(struct inode *inode) | |
1981 | { | |
1982 | inode->i_op = &fuse_common_inode_operations; | |
1983 | } | |
1984 | ||
1985 | void fuse_init_dir(struct inode *inode) | |
1986 | { | |
ab2257e9 MS |
1987 | struct fuse_inode *fi = get_fuse_inode(inode); |
1988 | ||
e5e5558e MS |
1989 | inode->i_op = &fuse_dir_inode_operations; |
1990 | inode->i_fop = &fuse_dir_operations; | |
ab2257e9 MS |
1991 | |
1992 | spin_lock_init(&fi->rdc.lock); | |
1993 | fi->rdc.cached = false; | |
1994 | fi->rdc.size = 0; | |
1995 | fi->rdc.pos = 0; | |
1996 | fi->rdc.version = 0; | |
e5e5558e MS |
1997 | } |
1998 | ||
5efd00e4 | 1999 | static int fuse_symlink_read_folio(struct file *null, struct folio *folio) |
5571f1e6 | 2000 | { |
5efd00e4 | 2001 | int err = fuse_readlink_page(folio->mapping->host, &folio->page); |
5571f1e6 DS |
2002 | |
2003 | if (!err) | |
5efd00e4 | 2004 | folio_mark_uptodate(folio); |
5571f1e6 | 2005 | |
5efd00e4 | 2006 | folio_unlock(folio); |
5571f1e6 DS |
2007 | |
2008 | return err; | |
2009 | } | |
2010 | ||
2011 | static const struct address_space_operations fuse_symlink_aops = { | |
5efd00e4 | 2012 | .read_folio = fuse_symlink_read_folio, |
5571f1e6 DS |
2013 | }; |
2014 | ||
e5e5558e MS |
2015 | void fuse_init_symlink(struct inode *inode) |
2016 | { | |
2017 | inode->i_op = &fuse_symlink_inode_operations; | |
5571f1e6 DS |
2018 | inode->i_data.a_ops = &fuse_symlink_aops; |
2019 | inode_nohighmem(inode); | |
e5e5558e | 2020 | } |