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> |
e5e5558e | 20 | |
4582a4ab FS |
21 | static void fuse_advise_use_readdirplus(struct inode *dir) |
22 | { | |
23 | struct fuse_inode *fi = get_fuse_inode(dir); | |
24 | ||
25 | set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state); | |
26 | } | |
27 | ||
30c6a23d KK |
28 | #if BITS_PER_LONG >= 64 |
29 | static inline void __fuse_dentry_settime(struct dentry *entry, u64 time) | |
30 | { | |
31 | entry->d_fsdata = (void *) time; | |
32 | } | |
33 | ||
34 | static inline u64 fuse_dentry_time(const struct dentry *entry) | |
35 | { | |
36 | return (u64)entry->d_fsdata; | |
37 | } | |
38 | ||
39 | #else | |
f75fdf22 MS |
40 | union fuse_dentry { |
41 | u64 time; | |
42 | struct rcu_head rcu; | |
43 | }; | |
44 | ||
30c6a23d KK |
45 | static inline void __fuse_dentry_settime(struct dentry *dentry, u64 time) |
46 | { | |
47 | ((union fuse_dentry *) dentry->d_fsdata)->time = time; | |
48 | } | |
49 | ||
50 | static inline u64 fuse_dentry_time(const struct dentry *entry) | |
51 | { | |
52 | return ((union fuse_dentry *) entry->d_fsdata)->time; | |
53 | } | |
54 | #endif | |
55 | ||
8fab0106 | 56 | static void fuse_dentry_settime(struct dentry *dentry, u64 time) |
0a0898cf | 57 | { |
8fab0106 MS |
58 | struct fuse_conn *fc = get_fuse_conn_super(dentry->d_sb); |
59 | bool delete = !time && fc->delete_stale; | |
60 | /* | |
61 | * Mess with DCACHE_OP_DELETE because dput() will be faster without it. | |
62 | * Don't care about races, either way it's just an optimization | |
63 | */ | |
64 | if ((!delete && (dentry->d_flags & DCACHE_OP_DELETE)) || | |
65 | (delete && !(dentry->d_flags & DCACHE_OP_DELETE))) { | |
66 | spin_lock(&dentry->d_lock); | |
67 | if (!delete) | |
68 | dentry->d_flags &= ~DCACHE_OP_DELETE; | |
69 | else | |
70 | dentry->d_flags |= DCACHE_OP_DELETE; | |
71 | spin_unlock(&dentry->d_lock); | |
72 | } | |
73 | ||
30c6a23d | 74 | __fuse_dentry_settime(dentry, time); |
0a0898cf | 75 | } |
0a0898cf | 76 | |
6f9f1180 MS |
77 | /* |
78 | * FUSE caches dentries and attributes with separate timeout. The | |
79 | * time in jiffies until the dentry/attributes are valid is stored in | |
f75fdf22 | 80 | * dentry->d_fsdata and fuse_inode->i_time respectively. |
6f9f1180 MS |
81 | */ |
82 | ||
83 | /* | |
84 | * Calculate the time in jiffies until a dentry/attributes are valid | |
85 | */ | |
bcb6f6d2 | 86 | static u64 time_to_jiffies(u64 sec, u32 nsec) |
e5e5558e | 87 | { |
685d16dd | 88 | if (sec || nsec) { |
bcb6f6d2 MS |
89 | struct timespec64 ts = { |
90 | sec, | |
21067527 | 91 | min_t(u32, nsec, NSEC_PER_SEC - 1) |
bcb6f6d2 MS |
92 | }; |
93 | ||
94 | return get_jiffies_64() + timespec64_to_jiffies(&ts); | |
685d16dd | 95 | } else |
0a0898cf | 96 | return 0; |
e5e5558e MS |
97 | } |
98 | ||
6f9f1180 MS |
99 | /* |
100 | * Set dentry and possibly attribute timeouts from the lookup/mk* | |
101 | * replies | |
102 | */ | |
d123d8e1 | 103 | void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o) |
0aa7c699 | 104 | { |
0a0898cf MS |
105 | fuse_dentry_settime(entry, |
106 | time_to_jiffies(o->entry_valid, o->entry_valid_nsec)); | |
1fb69e78 MS |
107 | } |
108 | ||
109 | static u64 attr_timeout(struct fuse_attr_out *o) | |
110 | { | |
111 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
112 | } | |
113 | ||
d123d8e1 | 114 | u64 entry_attr_timeout(struct fuse_entry_out *o) |
1fb69e78 MS |
115 | { |
116 | return time_to_jiffies(o->attr_valid, o->attr_valid_nsec); | |
8cbdf1e6 MS |
117 | } |
118 | ||
2f1e8196 MS |
119 | static void fuse_invalidate_attr_mask(struct inode *inode, u32 mask) |
120 | { | |
121 | set_mask_bits(&get_fuse_inode(inode)->inval_mask, 0, mask); | |
122 | } | |
123 | ||
6f9f1180 MS |
124 | /* |
125 | * Mark the attributes as stale, so that at the next call to | |
126 | * ->getattr() they will be fetched from userspace | |
127 | */ | |
8cbdf1e6 MS |
128 | void fuse_invalidate_attr(struct inode *inode) |
129 | { | |
2f1e8196 | 130 | fuse_invalidate_attr_mask(inode, STATX_BASIC_STATS); |
8cbdf1e6 MS |
131 | } |
132 | ||
261aaba7 MS |
133 | static void fuse_dir_changed(struct inode *dir) |
134 | { | |
135 | fuse_invalidate_attr(dir); | |
136 | inode_maybe_inc_iversion(dir, false); | |
137 | } | |
138 | ||
451418fc AG |
139 | /** |
140 | * Mark the attributes as stale due to an atime change. Avoid the invalidate if | |
141 | * atime is not used. | |
142 | */ | |
143 | void fuse_invalidate_atime(struct inode *inode) | |
144 | { | |
145 | if (!IS_RDONLY(inode)) | |
2f1e8196 | 146 | fuse_invalidate_attr_mask(inode, STATX_ATIME); |
451418fc AG |
147 | } |
148 | ||
6f9f1180 MS |
149 | /* |
150 | * Just mark the entry as stale, so that a next attempt to look it up | |
151 | * will result in a new lookup call to userspace | |
152 | * | |
153 | * This is called when a dentry is about to become negative and the | |
154 | * timeout is unknown (unlink, rmdir, rename and in some cases | |
155 | * lookup) | |
156 | */ | |
dbd561d2 | 157 | void fuse_invalidate_entry_cache(struct dentry *entry) |
8cbdf1e6 | 158 | { |
0a0898cf | 159 | fuse_dentry_settime(entry, 0); |
8cbdf1e6 MS |
160 | } |
161 | ||
6f9f1180 MS |
162 | /* |
163 | * Same as fuse_invalidate_entry_cache(), but also try to remove the | |
164 | * dentry from the hash | |
165 | */ | |
8cbdf1e6 MS |
166 | static void fuse_invalidate_entry(struct dentry *entry) |
167 | { | |
168 | d_invalidate(entry); | |
169 | fuse_invalidate_entry_cache(entry); | |
0aa7c699 MS |
170 | } |
171 | ||
7078187a | 172 | static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, |
13983d06 | 173 | u64 nodeid, const struct qstr *name, |
e5e5558e MS |
174 | struct fuse_entry_out *outarg) |
175 | { | |
0e9663ee | 176 | memset(outarg, 0, sizeof(struct fuse_entry_out)); |
d5b48543 MS |
177 | args->opcode = FUSE_LOOKUP; |
178 | args->nodeid = nodeid; | |
179 | args->in_numargs = 1; | |
180 | args->in_args[0].size = name->len + 1; | |
181 | args->in_args[0].value = name->name; | |
182 | args->out_numargs = 1; | |
183 | args->out_args[0].size = sizeof(struct fuse_entry_out); | |
184 | args->out_args[0].value = outarg; | |
e5e5558e MS |
185 | } |
186 | ||
6f9f1180 MS |
187 | /* |
188 | * Check whether the dentry is still valid | |
189 | * | |
190 | * If the entry validity timeout has expired and the dentry is | |
191 | * positive, try to redo the lookup. If the lookup results in a | |
192 | * different inode, then let the VFS invalidate the dentry and redo | |
193 | * the lookup once more. If the lookup results in the same inode, | |
194 | * then refresh the attributes, timeouts and mark the dentry valid. | |
195 | */ | |
0b728e19 | 196 | static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) |
e5e5558e | 197 | { |
34286d66 | 198 | struct inode *inode; |
28420dad | 199 | struct dentry *parent; |
fcee216b | 200 | struct fuse_mount *fm; |
6314efee | 201 | struct fuse_inode *fi; |
e2a6b952 | 202 | int ret; |
8cbdf1e6 | 203 | |
2b0143b5 | 204 | inode = d_inode_rcu(entry); |
8cbdf1e6 | 205 | if (inode && is_bad_inode(inode)) |
e2a6b952 | 206 | goto invalid; |
154210cc | 207 | else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) || |
df8629af | 208 | (flags & (LOOKUP_EXCL | LOOKUP_REVAL))) { |
e5e5558e | 209 | struct fuse_entry_out outarg; |
7078187a | 210 | FUSE_ARGS(args); |
07e77dca | 211 | struct fuse_forget_link *forget; |
1fb69e78 | 212 | u64 attr_version; |
8cbdf1e6 | 213 | |
50322fe7 | 214 | /* For negative dentries, always do a fresh lookup */ |
8cbdf1e6 | 215 | if (!inode) |
e2a6b952 | 216 | goto invalid; |
8cbdf1e6 | 217 | |
e2a6b952 | 218 | ret = -ECHILD; |
0b728e19 | 219 | if (flags & LOOKUP_RCU) |
e2a6b952 | 220 | goto out; |
e7c0a167 | 221 | |
fcee216b | 222 | fm = get_fuse_mount(inode); |
e5e5558e | 223 | |
07e77dca | 224 | forget = fuse_alloc_forget(); |
7078187a MS |
225 | ret = -ENOMEM; |
226 | if (!forget) | |
e2a6b952 | 227 | goto out; |
2d51013e | 228 | |
fcee216b | 229 | attr_version = fuse_get_attr_version(fm->fc); |
1fb69e78 | 230 | |
e956edd0 | 231 | parent = dget_parent(entry); |
fcee216b | 232 | fuse_lookup_init(fm->fc, &args, get_node_id(d_inode(parent)), |
c180eebe | 233 | &entry->d_name, &outarg); |
fcee216b | 234 | ret = fuse_simple_request(fm, &args); |
e956edd0 | 235 | dput(parent); |
50322fe7 | 236 | /* Zero nodeid is same as -ENOENT */ |
7078187a MS |
237 | if (!ret && !outarg.nodeid) |
238 | ret = -ENOENT; | |
239 | if (!ret) { | |
6314efee | 240 | fi = get_fuse_inode(inode); |
bf109c64 MR |
241 | if (outarg.nodeid != get_node_id(inode) || |
242 | (bool) IS_AUTOMOUNT(inode) != (bool) (outarg.attr.flags & FUSE_ATTR_SUBMOUNT)) { | |
fcee216b MR |
243 | fuse_queue_forget(fm->fc, forget, |
244 | outarg.nodeid, 1); | |
e2a6b952 | 245 | goto invalid; |
9e6268db | 246 | } |
c9d8f5f0 | 247 | spin_lock(&fi->lock); |
1729a16c | 248 | fi->nlookup++; |
c9d8f5f0 | 249 | spin_unlock(&fi->lock); |
9e6268db | 250 | } |
07e77dca | 251 | kfree(forget); |
7078187a MS |
252 | if (ret == -ENOMEM) |
253 | goto out; | |
eb59bd17 MS |
254 | if (ret || fuse_invalid_attr(&outarg.attr) || |
255 | (outarg.attr.mode ^ inode->i_mode) & S_IFMT) | |
e2a6b952 | 256 | goto invalid; |
e5e5558e | 257 | |
60bcc88a | 258 | forget_all_cached_acls(inode); |
1fb69e78 MS |
259 | fuse_change_attributes(inode, &outarg.attr, |
260 | entry_attr_timeout(&outarg), | |
261 | attr_version); | |
262 | fuse_change_entry_timeout(entry, &outarg); | |
28420dad | 263 | } else if (inode) { |
6314efee MS |
264 | fi = get_fuse_inode(inode); |
265 | if (flags & LOOKUP_RCU) { | |
266 | if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state)) | |
267 | return -ECHILD; | |
268 | } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) { | |
28420dad | 269 | parent = dget_parent(entry); |
2b0143b5 | 270 | fuse_advise_use_readdirplus(d_inode(parent)); |
28420dad MS |
271 | dput(parent); |
272 | } | |
e5e5558e | 273 | } |
e2a6b952 MS |
274 | ret = 1; |
275 | out: | |
276 | return ret; | |
277 | ||
278 | invalid: | |
279 | ret = 0; | |
280 | goto out; | |
e5e5558e MS |
281 | } |
282 | ||
30c6a23d | 283 | #if BITS_PER_LONG < 64 |
f75fdf22 MS |
284 | static int fuse_dentry_init(struct dentry *dentry) |
285 | { | |
dc69e98c KK |
286 | dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), |
287 | GFP_KERNEL_ACCOUNT | __GFP_RECLAIMABLE); | |
f75fdf22 MS |
288 | |
289 | return dentry->d_fsdata ? 0 : -ENOMEM; | |
290 | } | |
291 | static void fuse_dentry_release(struct dentry *dentry) | |
292 | { | |
293 | union fuse_dentry *fd = dentry->d_fsdata; | |
294 | ||
295 | kfree_rcu(fd, rcu); | |
296 | } | |
30c6a23d | 297 | #endif |
f75fdf22 | 298 | |
8fab0106 MS |
299 | static int fuse_dentry_delete(const struct dentry *dentry) |
300 | { | |
301 | return time_before64(fuse_dentry_time(dentry), get_jiffies_64()); | |
302 | } | |
303 | ||
bf109c64 MR |
304 | /* |
305 | * Create a fuse_mount object with a new superblock (with path->dentry | |
306 | * as the root), and return that mount so it can be auto-mounted on | |
307 | * @path. | |
308 | */ | |
309 | static struct vfsmount *fuse_dentry_automount(struct path *path) | |
310 | { | |
311 | struct fs_context *fsc; | |
312 | struct fuse_mount *parent_fm = get_fuse_mount_super(path->mnt->mnt_sb); | |
313 | struct fuse_conn *fc = parent_fm->fc; | |
314 | struct fuse_mount *fm; | |
315 | struct vfsmount *mnt; | |
316 | struct fuse_inode *mp_fi = get_fuse_inode(d_inode(path->dentry)); | |
317 | struct super_block *sb; | |
318 | int err; | |
319 | ||
320 | fsc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry); | |
321 | if (IS_ERR(fsc)) { | |
322 | err = PTR_ERR(fsc); | |
323 | goto out; | |
324 | } | |
325 | ||
326 | err = -ENOMEM; | |
327 | fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL); | |
328 | if (!fm) | |
329 | goto out_put_fsc; | |
330 | ||
bf109c64 MR |
331 | fsc->s_fs_info = fm; |
332 | sb = sget_fc(fsc, NULL, set_anon_super_fc); | |
333 | if (IS_ERR(sb)) { | |
334 | err = PTR_ERR(sb); | |
514b5e3f | 335 | kfree(fm); |
bf109c64 MR |
336 | goto out_put_fsc; |
337 | } | |
338 | fm->fc = fuse_conn_get(fc); | |
339 | ||
340 | /* Initialize superblock, making @mp_fi its root */ | |
341 | err = fuse_fill_super_submount(sb, mp_fi); | |
342 | if (err) | |
343 | goto out_put_sb; | |
344 | ||
345 | sb->s_flags |= SB_ACTIVE; | |
346 | fsc->root = dget(sb->s_root); | |
347 | /* We are done configuring the superblock, so unlock it */ | |
348 | up_write(&sb->s_umount); | |
349 | ||
350 | down_write(&fc->killsb); | |
351 | list_add_tail(&fm->fc_entry, &fc->mounts); | |
352 | up_write(&fc->killsb); | |
353 | ||
354 | /* Create the submount */ | |
355 | mnt = vfs_create_mount(fsc); | |
356 | if (IS_ERR(mnt)) { | |
357 | err = PTR_ERR(mnt); | |
358 | goto out_put_fsc; | |
359 | } | |
360 | mntget(mnt); | |
361 | put_fs_context(fsc); | |
362 | return mnt; | |
363 | ||
364 | out_put_sb: | |
365 | /* | |
366 | * Only jump here when fsc->root is NULL and sb is still locked | |
367 | * (otherwise put_fs_context() will put the superblock) | |
368 | */ | |
369 | deactivate_locked_super(sb); | |
370 | out_put_fsc: | |
371 | put_fs_context(fsc); | |
372 | out: | |
373 | return ERR_PTR(err); | |
374 | } | |
375 | ||
4269590a | 376 | const struct dentry_operations fuse_dentry_operations = { |
e5e5558e | 377 | .d_revalidate = fuse_dentry_revalidate, |
8fab0106 | 378 | .d_delete = fuse_dentry_delete, |
30c6a23d | 379 | #if BITS_PER_LONG < 64 |
f75fdf22 MS |
380 | .d_init = fuse_dentry_init, |
381 | .d_release = fuse_dentry_release, | |
30c6a23d | 382 | #endif |
bf109c64 | 383 | .d_automount = fuse_dentry_automount, |
e5e5558e MS |
384 | }; |
385 | ||
0ce267ff | 386 | const struct dentry_operations fuse_root_dentry_operations = { |
30c6a23d | 387 | #if BITS_PER_LONG < 64 |
0ce267ff MS |
388 | .d_init = fuse_dentry_init, |
389 | .d_release = fuse_dentry_release, | |
30c6a23d | 390 | #endif |
0ce267ff MS |
391 | }; |
392 | ||
a5bfffac | 393 | int fuse_valid_type(int m) |
39ee059a MS |
394 | { |
395 | return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) || | |
396 | S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m); | |
397 | } | |
398 | ||
eb59bd17 MS |
399 | bool fuse_invalid_attr(struct fuse_attr *attr) |
400 | { | |
401 | return !fuse_valid_type(attr->mode) || | |
402 | attr->size > LLONG_MAX; | |
403 | } | |
404 | ||
13983d06 | 405 | int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name, |
c180eebe | 406 | struct fuse_entry_out *outarg, struct inode **inode) |
e5e5558e | 407 | { |
fcee216b | 408 | struct fuse_mount *fm = get_fuse_mount_super(sb); |
7078187a | 409 | FUSE_ARGS(args); |
07e77dca | 410 | struct fuse_forget_link *forget; |
1fb69e78 | 411 | u64 attr_version; |
c180eebe | 412 | int err; |
e5e5558e | 413 | |
c180eebe MS |
414 | *inode = NULL; |
415 | err = -ENAMETOOLONG; | |
416 | if (name->len > FUSE_NAME_MAX) | |
417 | goto out; | |
e5e5558e | 418 | |
e5e5558e | 419 | |
07e77dca MS |
420 | forget = fuse_alloc_forget(); |
421 | err = -ENOMEM; | |
7078187a | 422 | if (!forget) |
c180eebe | 423 | goto out; |
2d51013e | 424 | |
fcee216b | 425 | attr_version = fuse_get_attr_version(fm->fc); |
1fb69e78 | 426 | |
fcee216b MR |
427 | fuse_lookup_init(fm->fc, &args, nodeid, name, outarg); |
428 | err = fuse_simple_request(fm, &args); | |
50322fe7 | 429 | /* Zero nodeid is same as -ENOENT, but with valid timeout */ |
c180eebe MS |
430 | if (err || !outarg->nodeid) |
431 | goto out_put_forget; | |
432 | ||
433 | err = -EIO; | |
434 | if (!outarg->nodeid) | |
435 | goto out_put_forget; | |
eb59bd17 | 436 | if (fuse_invalid_attr(&outarg->attr)) |
c180eebe MS |
437 | goto out_put_forget; |
438 | ||
439 | *inode = fuse_iget(sb, outarg->nodeid, outarg->generation, | |
440 | &outarg->attr, entry_attr_timeout(outarg), | |
441 | attr_version); | |
442 | err = -ENOMEM; | |
443 | if (!*inode) { | |
fcee216b | 444 | fuse_queue_forget(fm->fc, forget, outarg->nodeid, 1); |
c180eebe | 445 | goto out; |
e5e5558e | 446 | } |
c180eebe MS |
447 | err = 0; |
448 | ||
449 | out_put_forget: | |
07e77dca | 450 | kfree(forget); |
c180eebe MS |
451 | out: |
452 | return err; | |
453 | } | |
454 | ||
455 | static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, | |
00cd8dd3 | 456 | unsigned int flags) |
c180eebe MS |
457 | { |
458 | int err; | |
459 | struct fuse_entry_out outarg; | |
460 | struct inode *inode; | |
461 | struct dentry *newent; | |
c180eebe | 462 | bool outarg_valid = true; |
63576c13 | 463 | bool locked; |
c180eebe | 464 | |
63576c13 | 465 | locked = fuse_lock_inode(dir); |
c180eebe MS |
466 | err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name, |
467 | &outarg, &inode); | |
63576c13 | 468 | fuse_unlock_inode(dir, locked); |
c180eebe MS |
469 | if (err == -ENOENT) { |
470 | outarg_valid = false; | |
471 | err = 0; | |
472 | } | |
473 | if (err) | |
474 | goto out_err; | |
475 | ||
476 | err = -EIO; | |
477 | if (inode && get_node_id(inode) == FUSE_ROOT_ID) | |
478 | goto out_iput; | |
e5e5558e | 479 | |
41d28bca | 480 | newent = d_splice_alias(inode, entry); |
5835f339 MS |
481 | err = PTR_ERR(newent); |
482 | if (IS_ERR(newent)) | |
483 | goto out_err; | |
d2a85164 | 484 | |
0de6256d | 485 | entry = newent ? newent : entry; |
c180eebe | 486 | if (outarg_valid) |
1fb69e78 | 487 | fuse_change_entry_timeout(entry, &outarg); |
8cbdf1e6 MS |
488 | else |
489 | fuse_invalidate_entry_cache(entry); | |
c180eebe | 490 | |
6c26f717 MS |
491 | if (inode) |
492 | fuse_advise_use_readdirplus(dir); | |
0de6256d | 493 | return newent; |
c180eebe MS |
494 | |
495 | out_iput: | |
496 | iput(inode); | |
497 | out_err: | |
498 | return ERR_PTR(err); | |
e5e5558e MS |
499 | } |
500 | ||
6f9f1180 MS |
501 | /* |
502 | * Atomic create+open operation | |
503 | * | |
504 | * If the filesystem doesn't support this, then fall back to separate | |
505 | * 'mknod' + 'open' requests. | |
506 | */ | |
d9585277 | 507 | static int fuse_create_open(struct inode *dir, struct dentry *entry, |
30d90494 | 508 | struct file *file, unsigned flags, |
b452a458 | 509 | umode_t mode) |
fd72faac MS |
510 | { |
511 | int err; | |
512 | struct inode *inode; | |
fcee216b | 513 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a | 514 | FUSE_ARGS(args); |
07e77dca | 515 | struct fuse_forget_link *forget; |
e0a43ddc | 516 | struct fuse_create_in inarg; |
fd72faac MS |
517 | struct fuse_open_out outopen; |
518 | struct fuse_entry_out outentry; | |
ebf84d0c | 519 | struct fuse_inode *fi; |
fd72faac | 520 | struct fuse_file *ff; |
fd72faac | 521 | |
af109bca MS |
522 | /* Userspace expects S_IFREG in create mode */ |
523 | BUG_ON((mode & S_IFMT) != S_IFREG); | |
524 | ||
07e77dca | 525 | forget = fuse_alloc_forget(); |
c8ccbe03 | 526 | err = -ENOMEM; |
07e77dca | 527 | if (!forget) |
c8ccbe03 | 528 | goto out_err; |
51eb01e7 | 529 | |
ce1d5a49 | 530 | err = -ENOMEM; |
fcee216b | 531 | ff = fuse_file_alloc(fm); |
fd72faac | 532 | if (!ff) |
7078187a | 533 | goto out_put_forget_req; |
fd72faac | 534 | |
fcee216b | 535 | if (!fm->fc->dont_mask) |
e0a43ddc MS |
536 | mode &= ~current_umask(); |
537 | ||
fd72faac MS |
538 | flags &= ~O_NOCTTY; |
539 | memset(&inarg, 0, sizeof(inarg)); | |
0e9663ee | 540 | memset(&outentry, 0, sizeof(outentry)); |
fd72faac MS |
541 | inarg.flags = flags; |
542 | inarg.mode = mode; | |
e0a43ddc | 543 | inarg.umask = current_umask(); |
d5b48543 MS |
544 | args.opcode = FUSE_CREATE; |
545 | args.nodeid = get_node_id(dir); | |
546 | args.in_numargs = 2; | |
547 | args.in_args[0].size = sizeof(inarg); | |
548 | args.in_args[0].value = &inarg; | |
549 | args.in_args[1].size = entry->d_name.len + 1; | |
550 | args.in_args[1].value = entry->d_name.name; | |
551 | args.out_numargs = 2; | |
552 | args.out_args[0].size = sizeof(outentry); | |
553 | args.out_args[0].value = &outentry; | |
554 | args.out_args[1].size = sizeof(outopen); | |
555 | args.out_args[1].value = &outopen; | |
fcee216b | 556 | err = fuse_simple_request(fm, &args); |
c8ccbe03 | 557 | if (err) |
fd72faac | 558 | goto out_free_ff; |
fd72faac MS |
559 | |
560 | err = -EIO; | |
eb59bd17 MS |
561 | if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid) || |
562 | fuse_invalid_attr(&outentry.attr)) | |
fd72faac MS |
563 | goto out_free_ff; |
564 | ||
c7b7143c MS |
565 | ff->fh = outopen.fh; |
566 | ff->nodeid = outentry.nodeid; | |
567 | ff->open_flags = outopen.open_flags; | |
fd72faac | 568 | inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, |
1fb69e78 | 569 | &outentry.attr, entry_attr_timeout(&outentry), 0); |
fd72faac MS |
570 | if (!inode) { |
571 | flags &= ~(O_CREAT | O_EXCL | O_TRUNC); | |
ebf84d0c | 572 | fuse_sync_release(NULL, ff, flags); |
fcee216b | 573 | fuse_queue_forget(fm->fc, forget, outentry.nodeid, 1); |
c8ccbe03 MS |
574 | err = -ENOMEM; |
575 | goto out_err; | |
fd72faac | 576 | } |
07e77dca | 577 | kfree(forget); |
fd72faac | 578 | d_instantiate(entry, inode); |
1fb69e78 | 579 | fuse_change_entry_timeout(entry, &outentry); |
261aaba7 | 580 | fuse_dir_changed(dir); |
be12af3e | 581 | err = finish_open(file, entry, generic_file_open); |
30d90494 | 582 | if (err) { |
ebf84d0c KT |
583 | fi = get_fuse_inode(inode); |
584 | fuse_sync_release(fi, ff, flags); | |
c8ccbe03 | 585 | } else { |
267d8444 | 586 | file->private_data = ff; |
c8ccbe03 | 587 | fuse_finish_open(inode, file); |
fd72faac | 588 | } |
d9585277 | 589 | return err; |
fd72faac | 590 | |
c8ccbe03 | 591 | out_free_ff: |
fd72faac | 592 | fuse_file_free(ff); |
c8ccbe03 | 593 | out_put_forget_req: |
07e77dca | 594 | kfree(forget); |
c8ccbe03 | 595 | out_err: |
d9585277 | 596 | return err; |
c8ccbe03 MS |
597 | } |
598 | ||
599 | static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t); | |
d9585277 | 600 | static int fuse_atomic_open(struct inode *dir, struct dentry *entry, |
30d90494 | 601 | struct file *file, unsigned flags, |
44907d79 | 602 | umode_t mode) |
c8ccbe03 MS |
603 | { |
604 | int err; | |
605 | struct fuse_conn *fc = get_fuse_conn(dir); | |
c8ccbe03 MS |
606 | struct dentry *res = NULL; |
607 | ||
00699ad8 | 608 | if (d_in_lookup(entry)) { |
00cd8dd3 | 609 | res = fuse_lookup(dir, entry, 0); |
c8ccbe03 | 610 | if (IS_ERR(res)) |
d9585277 | 611 | return PTR_ERR(res); |
c8ccbe03 MS |
612 | |
613 | if (res) | |
614 | entry = res; | |
615 | } | |
616 | ||
2b0143b5 | 617 | if (!(flags & O_CREAT) || d_really_is_positive(entry)) |
c8ccbe03 MS |
618 | goto no_open; |
619 | ||
620 | /* Only creates */ | |
73a09dd9 | 621 | file->f_mode |= FMODE_CREATED; |
c8ccbe03 MS |
622 | |
623 | if (fc->no_create) | |
624 | goto mknod; | |
625 | ||
b452a458 | 626 | err = fuse_create_open(dir, entry, file, flags, mode); |
d9585277 | 627 | if (err == -ENOSYS) { |
c8ccbe03 MS |
628 | fc->no_create = 1; |
629 | goto mknod; | |
630 | } | |
631 | out_dput: | |
632 | dput(res); | |
d9585277 | 633 | return err; |
c8ccbe03 MS |
634 | |
635 | mknod: | |
636 | err = fuse_mknod(dir, entry, mode, 0); | |
d9585277 | 637 | if (err) |
c8ccbe03 | 638 | goto out_dput; |
c8ccbe03 | 639 | no_open: |
e45198a6 | 640 | return finish_no_open(file, res); |
fd72faac MS |
641 | } |
642 | ||
6f9f1180 MS |
643 | /* |
644 | * Code shared between mknod, mkdir, symlink and link | |
645 | */ | |
fcee216b | 646 | static int create_new_entry(struct fuse_mount *fm, struct fuse_args *args, |
9e6268db | 647 | struct inode *dir, struct dentry *entry, |
541af6a0 | 648 | umode_t mode) |
9e6268db MS |
649 | { |
650 | struct fuse_entry_out outarg; | |
651 | struct inode *inode; | |
c971e6a0 | 652 | struct dentry *d; |
9e6268db | 653 | int err; |
07e77dca | 654 | struct fuse_forget_link *forget; |
2d51013e | 655 | |
07e77dca | 656 | forget = fuse_alloc_forget(); |
7078187a | 657 | if (!forget) |
07e77dca | 658 | return -ENOMEM; |
9e6268db | 659 | |
0e9663ee | 660 | memset(&outarg, 0, sizeof(outarg)); |
d5b48543 MS |
661 | args->nodeid = get_node_id(dir); |
662 | args->out_numargs = 1; | |
663 | args->out_args[0].size = sizeof(outarg); | |
664 | args->out_args[0].value = &outarg; | |
fcee216b | 665 | err = fuse_simple_request(fm, args); |
2d51013e MS |
666 | if (err) |
667 | goto out_put_forget_req; | |
668 | ||
39ee059a | 669 | err = -EIO; |
eb59bd17 | 670 | if (invalid_nodeid(outarg.nodeid) || fuse_invalid_attr(&outarg.attr)) |
2d51013e | 671 | goto out_put_forget_req; |
39ee059a MS |
672 | |
673 | if ((outarg.attr.mode ^ mode) & S_IFMT) | |
2d51013e | 674 | goto out_put_forget_req; |
39ee059a | 675 | |
9e6268db | 676 | inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation, |
1fb69e78 | 677 | &outarg.attr, entry_attr_timeout(&outarg), 0); |
9e6268db | 678 | if (!inode) { |
fcee216b | 679 | fuse_queue_forget(fm->fc, forget, outarg.nodeid, 1); |
9e6268db MS |
680 | return -ENOMEM; |
681 | } | |
07e77dca | 682 | kfree(forget); |
9e6268db | 683 | |
c971e6a0 AV |
684 | d_drop(entry); |
685 | d = d_splice_alias(inode, entry); | |
686 | if (IS_ERR(d)) | |
687 | return PTR_ERR(d); | |
9e6268db | 688 | |
c971e6a0 AV |
689 | if (d) { |
690 | fuse_change_entry_timeout(d, &outarg); | |
691 | dput(d); | |
692 | } else { | |
693 | fuse_change_entry_timeout(entry, &outarg); | |
694 | } | |
261aaba7 | 695 | fuse_dir_changed(dir); |
9e6268db | 696 | return 0; |
39ee059a | 697 | |
2d51013e | 698 | out_put_forget_req: |
07e77dca | 699 | kfree(forget); |
39ee059a | 700 | return err; |
9e6268db MS |
701 | } |
702 | ||
1a67aafb | 703 | static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, |
9e6268db MS |
704 | dev_t rdev) |
705 | { | |
706 | struct fuse_mknod_in inarg; | |
fcee216b | 707 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a | 708 | FUSE_ARGS(args); |
9e6268db | 709 | |
fcee216b | 710 | if (!fm->fc->dont_mask) |
e0a43ddc MS |
711 | mode &= ~current_umask(); |
712 | ||
9e6268db MS |
713 | memset(&inarg, 0, sizeof(inarg)); |
714 | inarg.mode = mode; | |
715 | inarg.rdev = new_encode_dev(rdev); | |
e0a43ddc | 716 | inarg.umask = current_umask(); |
d5b48543 MS |
717 | args.opcode = FUSE_MKNOD; |
718 | args.in_numargs = 2; | |
719 | args.in_args[0].size = sizeof(inarg); | |
720 | args.in_args[0].value = &inarg; | |
721 | args.in_args[1].size = entry->d_name.len + 1; | |
722 | args.in_args[1].value = entry->d_name.name; | |
fcee216b | 723 | return create_new_entry(fm, &args, dir, entry, mode); |
9e6268db MS |
724 | } |
725 | ||
4acdaf27 | 726 | static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode, |
ebfc3b49 | 727 | bool excl) |
9e6268db MS |
728 | { |
729 | return fuse_mknod(dir, entry, mode, 0); | |
730 | } | |
731 | ||
18bb1db3 | 732 | static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) |
9e6268db MS |
733 | { |
734 | struct fuse_mkdir_in inarg; | |
fcee216b | 735 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a | 736 | FUSE_ARGS(args); |
9e6268db | 737 | |
fcee216b | 738 | if (!fm->fc->dont_mask) |
e0a43ddc MS |
739 | mode &= ~current_umask(); |
740 | ||
9e6268db MS |
741 | memset(&inarg, 0, sizeof(inarg)); |
742 | inarg.mode = mode; | |
e0a43ddc | 743 | inarg.umask = current_umask(); |
d5b48543 MS |
744 | args.opcode = FUSE_MKDIR; |
745 | args.in_numargs = 2; | |
746 | args.in_args[0].size = sizeof(inarg); | |
747 | args.in_args[0].value = &inarg; | |
748 | args.in_args[1].size = entry->d_name.len + 1; | |
749 | args.in_args[1].value = entry->d_name.name; | |
fcee216b | 750 | return create_new_entry(fm, &args, dir, entry, S_IFDIR); |
9e6268db MS |
751 | } |
752 | ||
753 | static int fuse_symlink(struct inode *dir, struct dentry *entry, | |
754 | const char *link) | |
755 | { | |
fcee216b | 756 | struct fuse_mount *fm = get_fuse_mount(dir); |
9e6268db | 757 | unsigned len = strlen(link) + 1; |
7078187a | 758 | FUSE_ARGS(args); |
9e6268db | 759 | |
d5b48543 MS |
760 | args.opcode = FUSE_SYMLINK; |
761 | args.in_numargs = 2; | |
762 | args.in_args[0].size = entry->d_name.len + 1; | |
763 | args.in_args[0].value = entry->d_name.name; | |
764 | args.in_args[1].size = len; | |
765 | args.in_args[1].value = link; | |
fcee216b | 766 | return create_new_entry(fm, &args, dir, entry, S_IFLNK); |
9e6268db MS |
767 | } |
768 | ||
703c7362 | 769 | void fuse_update_ctime(struct inode *inode) |
31f3267b MP |
770 | { |
771 | if (!IS_NOCMTIME(inode)) { | |
c2050a45 | 772 | inode->i_ctime = current_time(inode); |
31f3267b MP |
773 | mark_inode_dirty_sync(inode); |
774 | } | |
775 | } | |
776 | ||
9e6268db MS |
777 | static int fuse_unlink(struct inode *dir, struct dentry *entry) |
778 | { | |
779 | int err; | |
fcee216b | 780 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a MS |
781 | FUSE_ARGS(args); |
782 | ||
d5b48543 MS |
783 | args.opcode = FUSE_UNLINK; |
784 | args.nodeid = get_node_id(dir); | |
785 | args.in_numargs = 1; | |
786 | args.in_args[0].size = entry->d_name.len + 1; | |
787 | args.in_args[0].value = entry->d_name.name; | |
fcee216b | 788 | err = fuse_simple_request(fm, &args); |
9e6268db | 789 | if (!err) { |
2b0143b5 | 790 | struct inode *inode = d_inode(entry); |
ac45d613 | 791 | struct fuse_inode *fi = get_fuse_inode(inode); |
9e6268db | 792 | |
f15ecfef | 793 | spin_lock(&fi->lock); |
fcee216b | 794 | fi->attr_version = atomic64_inc_return(&fm->fc->attr_version); |
dfca7ceb MS |
795 | /* |
796 | * If i_nlink == 0 then unlink doesn't make sense, yet this can | |
797 | * happen if userspace filesystem is careless. It would be | |
798 | * difficult to enforce correct nlink usage so just ignore this | |
799 | * condition here | |
800 | */ | |
801 | if (inode->i_nlink > 0) | |
802 | drop_nlink(inode); | |
f15ecfef | 803 | spin_unlock(&fi->lock); |
9e6268db | 804 | fuse_invalidate_attr(inode); |
261aaba7 | 805 | fuse_dir_changed(dir); |
8cbdf1e6 | 806 | fuse_invalidate_entry_cache(entry); |
31f3267b | 807 | fuse_update_ctime(inode); |
9e6268db MS |
808 | } else if (err == -EINTR) |
809 | fuse_invalidate_entry(entry); | |
810 | return err; | |
811 | } | |
812 | ||
813 | static int fuse_rmdir(struct inode *dir, struct dentry *entry) | |
814 | { | |
815 | int err; | |
fcee216b | 816 | struct fuse_mount *fm = get_fuse_mount(dir); |
7078187a MS |
817 | FUSE_ARGS(args); |
818 | ||
d5b48543 MS |
819 | args.opcode = FUSE_RMDIR; |
820 | args.nodeid = get_node_id(dir); | |
821 | args.in_numargs = 1; | |
822 | args.in_args[0].size = entry->d_name.len + 1; | |
823 | args.in_args[0].value = entry->d_name.name; | |
fcee216b | 824 | err = fuse_simple_request(fm, &args); |
9e6268db | 825 | if (!err) { |
2b0143b5 | 826 | clear_nlink(d_inode(entry)); |
261aaba7 | 827 | fuse_dir_changed(dir); |
8cbdf1e6 | 828 | fuse_invalidate_entry_cache(entry); |
9e6268db MS |
829 | } else if (err == -EINTR) |
830 | fuse_invalidate_entry(entry); | |
831 | return err; | |
832 | } | |
833 | ||
1560c974 MS |
834 | static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, |
835 | struct inode *newdir, struct dentry *newent, | |
836 | unsigned int flags, int opcode, size_t argsize) | |
9e6268db MS |
837 | { |
838 | int err; | |
1560c974 | 839 | struct fuse_rename2_in inarg; |
fcee216b | 840 | struct fuse_mount *fm = get_fuse_mount(olddir); |
7078187a | 841 | FUSE_ARGS(args); |
9e6268db | 842 | |
1560c974 | 843 | memset(&inarg, 0, argsize); |
9e6268db | 844 | inarg.newdir = get_node_id(newdir); |
1560c974 | 845 | inarg.flags = flags; |
d5b48543 MS |
846 | args.opcode = opcode; |
847 | args.nodeid = get_node_id(olddir); | |
848 | args.in_numargs = 3; | |
849 | args.in_args[0].size = argsize; | |
850 | args.in_args[0].value = &inarg; | |
851 | args.in_args[1].size = oldent->d_name.len + 1; | |
852 | args.in_args[1].value = oldent->d_name.name; | |
853 | args.in_args[2].size = newent->d_name.len + 1; | |
854 | args.in_args[2].value = newent->d_name.name; | |
fcee216b | 855 | err = fuse_simple_request(fm, &args); |
9e6268db | 856 | if (!err) { |
08b63307 | 857 | /* ctime changes */ |
2b0143b5 DH |
858 | fuse_invalidate_attr(d_inode(oldent)); |
859 | fuse_update_ctime(d_inode(oldent)); | |
08b63307 | 860 | |
1560c974 | 861 | if (flags & RENAME_EXCHANGE) { |
2b0143b5 DH |
862 | fuse_invalidate_attr(d_inode(newent)); |
863 | fuse_update_ctime(d_inode(newent)); | |
1560c974 MS |
864 | } |
865 | ||
261aaba7 | 866 | fuse_dir_changed(olddir); |
9e6268db | 867 | if (olddir != newdir) |
261aaba7 | 868 | fuse_dir_changed(newdir); |
8cbdf1e6 MS |
869 | |
870 | /* newent will end up negative */ | |
2b0143b5 DH |
871 | if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) { |
872 | fuse_invalidate_attr(d_inode(newent)); | |
8cbdf1e6 | 873 | fuse_invalidate_entry_cache(newent); |
2b0143b5 | 874 | fuse_update_ctime(d_inode(newent)); |
5219f346 | 875 | } |
9e6268db MS |
876 | } else if (err == -EINTR) { |
877 | /* If request was interrupted, DEITY only knows if the | |
878 | rename actually took place. If the invalidation | |
879 | fails (e.g. some process has CWD under the renamed | |
880 | directory), then there can be inconsistency between | |
881 | the dcache and the real filesystem. Tough luck. */ | |
882 | fuse_invalidate_entry(oldent); | |
2b0143b5 | 883 | if (d_really_is_positive(newent)) |
9e6268db MS |
884 | fuse_invalidate_entry(newent); |
885 | } | |
886 | ||
887 | return err; | |
888 | } | |
889 | ||
1560c974 MS |
890 | static int fuse_rename2(struct inode *olddir, struct dentry *oldent, |
891 | struct inode *newdir, struct dentry *newent, | |
892 | unsigned int flags) | |
893 | { | |
894 | struct fuse_conn *fc = get_fuse_conn(olddir); | |
895 | int err; | |
896 | ||
519525fa | 897 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
1560c974 MS |
898 | return -EINVAL; |
899 | ||
4237ba43 MS |
900 | if (flags) { |
901 | if (fc->no_rename2 || fc->minor < 23) | |
902 | return -EINVAL; | |
1560c974 | 903 | |
4237ba43 MS |
904 | err = fuse_rename_common(olddir, oldent, newdir, newent, flags, |
905 | FUSE_RENAME2, | |
906 | sizeof(struct fuse_rename2_in)); | |
907 | if (err == -ENOSYS) { | |
908 | fc->no_rename2 = 1; | |
909 | err = -EINVAL; | |
910 | } | |
911 | } else { | |
912 | err = fuse_rename_common(olddir, oldent, newdir, newent, 0, | |
913 | FUSE_RENAME, | |
914 | sizeof(struct fuse_rename_in)); | |
1560c974 | 915 | } |
4237ba43 | 916 | |
1560c974 | 917 | return err; |
4237ba43 | 918 | } |
1560c974 | 919 | |
9e6268db MS |
920 | static int fuse_link(struct dentry *entry, struct inode *newdir, |
921 | struct dentry *newent) | |
922 | { | |
923 | int err; | |
924 | struct fuse_link_in inarg; | |
2b0143b5 | 925 | struct inode *inode = d_inode(entry); |
fcee216b | 926 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 927 | FUSE_ARGS(args); |
9e6268db MS |
928 | |
929 | memset(&inarg, 0, sizeof(inarg)); | |
930 | inarg.oldnodeid = get_node_id(inode); | |
d5b48543 MS |
931 | args.opcode = FUSE_LINK; |
932 | args.in_numargs = 2; | |
933 | args.in_args[0].size = sizeof(inarg); | |
934 | args.in_args[0].value = &inarg; | |
935 | args.in_args[1].size = newent->d_name.len + 1; | |
936 | args.in_args[1].value = newent->d_name.name; | |
fcee216b | 937 | err = create_new_entry(fm, &args, newdir, newent, inode->i_mode); |
9e6268db MS |
938 | /* Contrary to "normal" filesystems it can happen that link |
939 | makes two "logical" inodes point to the same "physical" | |
940 | inode. We invalidate the attributes of the old one, so it | |
941 | will reflect changes in the backing inode (link count, | |
942 | etc.) | |
943 | */ | |
ac45d613 MS |
944 | if (!err) { |
945 | struct fuse_inode *fi = get_fuse_inode(inode); | |
946 | ||
f15ecfef | 947 | spin_lock(&fi->lock); |
fcee216b | 948 | fi->attr_version = atomic64_inc_return(&fm->fc->attr_version); |
c634da71 MS |
949 | if (likely(inode->i_nlink < UINT_MAX)) |
950 | inc_nlink(inode); | |
f15ecfef | 951 | spin_unlock(&fi->lock); |
9e6268db | 952 | fuse_invalidate_attr(inode); |
31f3267b | 953 | fuse_update_ctime(inode); |
ac45d613 MS |
954 | } else if (err == -EINTR) { |
955 | fuse_invalidate_attr(inode); | |
956 | } | |
9e6268db MS |
957 | return err; |
958 | } | |
959 | ||
1fb69e78 MS |
960 | static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, |
961 | struct kstat *stat) | |
962 | { | |
203627bb | 963 | unsigned int blkbits; |
8373200b PE |
964 | struct fuse_conn *fc = get_fuse_conn(inode); |
965 | ||
966 | /* see the comment in fuse_change_attributes() */ | |
b0aa7606 | 967 | if (fc->writeback_cache && S_ISREG(inode->i_mode)) { |
8373200b | 968 | attr->size = i_size_read(inode); |
b0aa7606 MP |
969 | attr->mtime = inode->i_mtime.tv_sec; |
970 | attr->mtimensec = inode->i_mtime.tv_nsec; | |
31f3267b MP |
971 | attr->ctime = inode->i_ctime.tv_sec; |
972 | attr->ctimensec = inode->i_ctime.tv_nsec; | |
b0aa7606 | 973 | } |
203627bb | 974 | |
1fb69e78 MS |
975 | stat->dev = inode->i_sb->s_dev; |
976 | stat->ino = attr->ino; | |
977 | stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); | |
978 | stat->nlink = attr->nlink; | |
8cb08329 EB |
979 | stat->uid = make_kuid(fc->user_ns, attr->uid); |
980 | stat->gid = make_kgid(fc->user_ns, attr->gid); | |
1fb69e78 MS |
981 | stat->rdev = inode->i_rdev; |
982 | stat->atime.tv_sec = attr->atime; | |
983 | stat->atime.tv_nsec = attr->atimensec; | |
984 | stat->mtime.tv_sec = attr->mtime; | |
985 | stat->mtime.tv_nsec = attr->mtimensec; | |
986 | stat->ctime.tv_sec = attr->ctime; | |
987 | stat->ctime.tv_nsec = attr->ctimensec; | |
988 | stat->size = attr->size; | |
989 | stat->blocks = attr->blocks; | |
203627bb MS |
990 | |
991 | if (attr->blksize != 0) | |
992 | blkbits = ilog2(attr->blksize); | |
993 | else | |
994 | blkbits = inode->i_sb->s_blocksize_bits; | |
995 | ||
996 | stat->blksize = 1 << blkbits; | |
1fb69e78 MS |
997 | } |
998 | ||
c79e322f MS |
999 | static int fuse_do_getattr(struct inode *inode, struct kstat *stat, |
1000 | struct file *file) | |
e5e5558e MS |
1001 | { |
1002 | int err; | |
c79e322f MS |
1003 | struct fuse_getattr_in inarg; |
1004 | struct fuse_attr_out outarg; | |
fcee216b | 1005 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1006 | FUSE_ARGS(args); |
1fb69e78 MS |
1007 | u64 attr_version; |
1008 | ||
fcee216b | 1009 | attr_version = fuse_get_attr_version(fm->fc); |
1fb69e78 | 1010 | |
c79e322f | 1011 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1012 | memset(&outarg, 0, sizeof(outarg)); |
c79e322f MS |
1013 | /* Directories have separate file-handle space */ |
1014 | if (file && S_ISREG(inode->i_mode)) { | |
1015 | struct fuse_file *ff = file->private_data; | |
1016 | ||
1017 | inarg.getattr_flags |= FUSE_GETATTR_FH; | |
1018 | inarg.fh = ff->fh; | |
1019 | } | |
d5b48543 MS |
1020 | args.opcode = FUSE_GETATTR; |
1021 | args.nodeid = get_node_id(inode); | |
1022 | args.in_numargs = 1; | |
1023 | args.in_args[0].size = sizeof(inarg); | |
1024 | args.in_args[0].value = &inarg; | |
1025 | args.out_numargs = 1; | |
1026 | args.out_args[0].size = sizeof(outarg); | |
1027 | args.out_args[0].value = &outarg; | |
fcee216b | 1028 | err = fuse_simple_request(fm, &args); |
e5e5558e | 1029 | if (!err) { |
eb59bd17 MS |
1030 | if (fuse_invalid_attr(&outarg.attr) || |
1031 | (inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
e5e5558e MS |
1032 | make_bad_inode(inode); |
1033 | err = -EIO; | |
1034 | } else { | |
c79e322f MS |
1035 | fuse_change_attributes(inode, &outarg.attr, |
1036 | attr_timeout(&outarg), | |
1fb69e78 MS |
1037 | attr_version); |
1038 | if (stat) | |
c79e322f | 1039 | fuse_fillattr(inode, &outarg.attr, stat); |
e5e5558e MS |
1040 | } |
1041 | } | |
1042 | return err; | |
1043 | } | |
1044 | ||
5b97eeac | 1045 | static int fuse_update_get_attr(struct inode *inode, struct file *file, |
2f1e8196 MS |
1046 | struct kstat *stat, u32 request_mask, |
1047 | unsigned int flags) | |
bcb4be80 MS |
1048 | { |
1049 | struct fuse_inode *fi = get_fuse_inode(inode); | |
5b97eeac | 1050 | int err = 0; |
bf5c1898 | 1051 | bool sync; |
bcb4be80 | 1052 | |
bf5c1898 MS |
1053 | if (flags & AT_STATX_FORCE_SYNC) |
1054 | sync = true; | |
1055 | else if (flags & AT_STATX_DONT_SYNC) | |
1056 | sync = false; | |
2f1e8196 MS |
1057 | else if (request_mask & READ_ONCE(fi->inval_mask)) |
1058 | sync = true; | |
bf5c1898 MS |
1059 | else |
1060 | sync = time_before64(fi->i_time, get_jiffies_64()); | |
1061 | ||
1062 | if (sync) { | |
60bcc88a | 1063 | forget_all_cached_acls(inode); |
bcb4be80 | 1064 | err = fuse_do_getattr(inode, stat, file); |
5b97eeac MS |
1065 | } else if (stat) { |
1066 | generic_fillattr(inode, stat); | |
1067 | stat->mode = fi->orig_i_mode; | |
1068 | stat->ino = fi->orig_ino; | |
bcb4be80 MS |
1069 | } |
1070 | ||
bcb4be80 MS |
1071 | return err; |
1072 | } | |
1073 | ||
5b97eeac MS |
1074 | int fuse_update_attributes(struct inode *inode, struct file *file) |
1075 | { | |
802dc049 MS |
1076 | /* Do *not* need to get atime for internal purposes */ |
1077 | return fuse_update_get_attr(inode, file, NULL, | |
1078 | STATX_BASIC_STATS & ~STATX_ATIME, 0); | |
5b97eeac MS |
1079 | } |
1080 | ||
fcee216b | 1081 | int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid, |
451d0f59 | 1082 | u64 child_nodeid, struct qstr *name) |
3b463ae0 JM |
1083 | { |
1084 | int err = -ENOTDIR; | |
1085 | struct inode *parent; | |
1086 | struct dentry *dir; | |
1087 | struct dentry *entry; | |
1088 | ||
fcee216b | 1089 | parent = fuse_ilookup(fc, parent_nodeid, NULL); |
3b463ae0 JM |
1090 | if (!parent) |
1091 | return -ENOENT; | |
1092 | ||
5955102c | 1093 | inode_lock(parent); |
3b463ae0 JM |
1094 | if (!S_ISDIR(parent->i_mode)) |
1095 | goto unlock; | |
1096 | ||
1097 | err = -ENOENT; | |
1098 | dir = d_find_alias(parent); | |
1099 | if (!dir) | |
1100 | goto unlock; | |
1101 | ||
8387ff25 | 1102 | name->hash = full_name_hash(dir, name->name, name->len); |
3b463ae0 JM |
1103 | entry = d_lookup(dir, name); |
1104 | dput(dir); | |
1105 | if (!entry) | |
1106 | goto unlock; | |
1107 | ||
261aaba7 | 1108 | fuse_dir_changed(parent); |
3b463ae0 | 1109 | fuse_invalidate_entry(entry); |
451d0f59 | 1110 | |
2b0143b5 | 1111 | if (child_nodeid != 0 && d_really_is_positive(entry)) { |
5955102c | 1112 | inode_lock(d_inode(entry)); |
2b0143b5 | 1113 | if (get_node_id(d_inode(entry)) != child_nodeid) { |
451d0f59 JM |
1114 | err = -ENOENT; |
1115 | goto badentry; | |
1116 | } | |
1117 | if (d_mountpoint(entry)) { | |
1118 | err = -EBUSY; | |
1119 | goto badentry; | |
1120 | } | |
e36cb0b8 | 1121 | if (d_is_dir(entry)) { |
451d0f59 JM |
1122 | shrink_dcache_parent(entry); |
1123 | if (!simple_empty(entry)) { | |
1124 | err = -ENOTEMPTY; | |
1125 | goto badentry; | |
1126 | } | |
2b0143b5 | 1127 | d_inode(entry)->i_flags |= S_DEAD; |
451d0f59 JM |
1128 | } |
1129 | dont_mount(entry); | |
2b0143b5 | 1130 | clear_nlink(d_inode(entry)); |
451d0f59 JM |
1131 | err = 0; |
1132 | badentry: | |
5955102c | 1133 | inode_unlock(d_inode(entry)); |
451d0f59 JM |
1134 | if (!err) |
1135 | d_delete(entry); | |
1136 | } else { | |
1137 | err = 0; | |
1138 | } | |
3b463ae0 | 1139 | dput(entry); |
3b463ae0 JM |
1140 | |
1141 | unlock: | |
5955102c | 1142 | inode_unlock(parent); |
3b463ae0 JM |
1143 | iput(parent); |
1144 | return err; | |
1145 | } | |
1146 | ||
87729a55 MS |
1147 | /* |
1148 | * Calling into a user-controlled filesystem gives the filesystem | |
c2132c1b | 1149 | * daemon ptrace-like capabilities over the current process. This |
87729a55 MS |
1150 | * means, that the filesystem daemon is able to record the exact |
1151 | * filesystem operations performed, and can also control the behavior | |
1152 | * of the requester process in otherwise impossible ways. For example | |
1153 | * it can delay the operation for arbitrary length of time allowing | |
1154 | * DoS against the requester. | |
1155 | * | |
1156 | * For this reason only those processes can call into the filesystem, | |
1157 | * for which the owner of the mount has ptrace privilege. This | |
1158 | * excludes processes started by other users, suid or sgid processes. | |
1159 | */ | |
c2132c1b | 1160 | int fuse_allow_current_process(struct fuse_conn *fc) |
87729a55 | 1161 | { |
c69e8d9c | 1162 | const struct cred *cred; |
87729a55 | 1163 | |
29433a29 | 1164 | if (fc->allow_other) |
73f03c2b | 1165 | return current_in_userns(fc->user_ns); |
87729a55 | 1166 | |
c2132c1b | 1167 | cred = current_cred(); |
499dcf20 EB |
1168 | if (uid_eq(cred->euid, fc->user_id) && |
1169 | uid_eq(cred->suid, fc->user_id) && | |
1170 | uid_eq(cred->uid, fc->user_id) && | |
1171 | gid_eq(cred->egid, fc->group_id) && | |
1172 | gid_eq(cred->sgid, fc->group_id) && | |
1173 | gid_eq(cred->gid, fc->group_id)) | |
c2132c1b | 1174 | return 1; |
c69e8d9c | 1175 | |
c2132c1b | 1176 | return 0; |
87729a55 MS |
1177 | } |
1178 | ||
31d40d74 MS |
1179 | static int fuse_access(struct inode *inode, int mask) |
1180 | { | |
fcee216b | 1181 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1182 | FUSE_ARGS(args); |
31d40d74 MS |
1183 | struct fuse_access_in inarg; |
1184 | int err; | |
1185 | ||
698fa1d1 MS |
1186 | BUG_ON(mask & MAY_NOT_BLOCK); |
1187 | ||
fcee216b | 1188 | if (fm->fc->no_access) |
31d40d74 MS |
1189 | return 0; |
1190 | ||
31d40d74 | 1191 | memset(&inarg, 0, sizeof(inarg)); |
e6305c43 | 1192 | inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC); |
d5b48543 MS |
1193 | args.opcode = FUSE_ACCESS; |
1194 | args.nodeid = get_node_id(inode); | |
1195 | args.in_numargs = 1; | |
1196 | args.in_args[0].size = sizeof(inarg); | |
1197 | args.in_args[0].value = &inarg; | |
fcee216b | 1198 | err = fuse_simple_request(fm, &args); |
31d40d74 | 1199 | if (err == -ENOSYS) { |
fcee216b | 1200 | fm->fc->no_access = 1; |
31d40d74 MS |
1201 | err = 0; |
1202 | } | |
1203 | return err; | |
1204 | } | |
1205 | ||
10556cb2 | 1206 | static int fuse_perm_getattr(struct inode *inode, int mask) |
19690ddb | 1207 | { |
10556cb2 | 1208 | if (mask & MAY_NOT_BLOCK) |
19690ddb MS |
1209 | return -ECHILD; |
1210 | ||
60bcc88a | 1211 | forget_all_cached_acls(inode); |
19690ddb MS |
1212 | return fuse_do_getattr(inode, NULL, NULL); |
1213 | } | |
1214 | ||
6f9f1180 MS |
1215 | /* |
1216 | * Check permission. The two basic access models of FUSE are: | |
1217 | * | |
1218 | * 1) Local access checking ('default_permissions' mount option) based | |
1219 | * on file mode. This is the plain old disk filesystem permission | |
1220 | * modell. | |
1221 | * | |
1222 | * 2) "Remote" access checking, where server is responsible for | |
1223 | * checking permission in each inode operation. An exception to this | |
1224 | * is if ->permission() was invoked from sys_access() in which case an | |
1225 | * access request is sent. Execute permission is still checked | |
1226 | * locally based on file mode. | |
1227 | */ | |
10556cb2 | 1228 | static int fuse_permission(struct inode *inode, int mask) |
e5e5558e MS |
1229 | { |
1230 | struct fuse_conn *fc = get_fuse_conn(inode); | |
244f6385 MS |
1231 | bool refreshed = false; |
1232 | int err = 0; | |
e5e5558e | 1233 | |
c2132c1b | 1234 | if (!fuse_allow_current_process(fc)) |
e5e5558e | 1235 | return -EACCES; |
244f6385 MS |
1236 | |
1237 | /* | |
e8e96157 | 1238 | * If attributes are needed, refresh them before proceeding |
244f6385 | 1239 | */ |
29433a29 | 1240 | if (fc->default_permissions || |
e8e96157 | 1241 | ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) { |
19690ddb | 1242 | struct fuse_inode *fi = get_fuse_inode(inode); |
d233c7dd | 1243 | u32 perm_mask = STATX_MODE | STATX_UID | STATX_GID; |
19690ddb | 1244 | |
d233c7dd MS |
1245 | if (perm_mask & READ_ONCE(fi->inval_mask) || |
1246 | time_before64(fi->i_time, get_jiffies_64())) { | |
19690ddb MS |
1247 | refreshed = true; |
1248 | ||
10556cb2 | 1249 | err = fuse_perm_getattr(inode, mask); |
19690ddb MS |
1250 | if (err) |
1251 | return err; | |
1252 | } | |
244f6385 MS |
1253 | } |
1254 | ||
29433a29 | 1255 | if (fc->default_permissions) { |
2830ba7f | 1256 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1257 | |
1258 | /* If permission is denied, try to refresh file | |
1259 | attributes. This is also needed, because the root | |
1260 | node will at first have no permissions */ | |
244f6385 | 1261 | if (err == -EACCES && !refreshed) { |
10556cb2 | 1262 | err = fuse_perm_getattr(inode, mask); |
1e9a4ed9 | 1263 | if (!err) |
2830ba7f | 1264 | err = generic_permission(inode, mask); |
1e9a4ed9 MS |
1265 | } |
1266 | ||
6f9f1180 MS |
1267 | /* Note: the opposite of the above test does not |
1268 | exist. So if permissions are revoked this won't be | |
1269 | noticed immediately, only after the attribute | |
1270 | timeout has expired */ | |
9cfcac81 | 1271 | } else if (mask & (MAY_ACCESS | MAY_CHDIR)) { |
e8e96157 MS |
1272 | err = fuse_access(inode, mask); |
1273 | } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { | |
1274 | if (!(inode->i_mode & S_IXUGO)) { | |
1275 | if (refreshed) | |
1276 | return -EACCES; | |
1277 | ||
10556cb2 | 1278 | err = fuse_perm_getattr(inode, mask); |
e8e96157 MS |
1279 | if (!err && !(inode->i_mode & S_IXUGO)) |
1280 | return -EACCES; | |
1281 | } | |
e5e5558e | 1282 | } |
244f6385 | 1283 | return err; |
e5e5558e MS |
1284 | } |
1285 | ||
5571f1e6 | 1286 | static int fuse_readlink_page(struct inode *inode, struct page *page) |
e5e5558e | 1287 | { |
fcee216b | 1288 | struct fuse_mount *fm = get_fuse_mount(inode); |
4c29afec MS |
1289 | struct fuse_page_desc desc = { .length = PAGE_SIZE - 1 }; |
1290 | struct fuse_args_pages ap = { | |
1291 | .num_pages = 1, | |
1292 | .pages = &page, | |
1293 | .descs = &desc, | |
1294 | }; | |
1295 | char *link; | |
1296 | ssize_t res; | |
1297 | ||
1298 | ap.args.opcode = FUSE_READLINK; | |
1299 | ap.args.nodeid = get_node_id(inode); | |
1300 | ap.args.out_pages = true; | |
1301 | ap.args.out_argvar = true; | |
1302 | ap.args.page_zeroing = true; | |
1303 | ap.args.out_numargs = 1; | |
1304 | ap.args.out_args[0].size = desc.length; | |
fcee216b | 1305 | res = fuse_simple_request(fm, &ap.args); |
e5e5558e | 1306 | |
4c29afec | 1307 | fuse_invalidate_atime(inode); |
6b255391 | 1308 | |
4c29afec MS |
1309 | if (res < 0) |
1310 | return res; | |
7078187a | 1311 | |
4c29afec MS |
1312 | if (WARN_ON(res >= PAGE_SIZE)) |
1313 | return -EIO; | |
5571f1e6 | 1314 | |
4c29afec MS |
1315 | link = page_address(page); |
1316 | link[res] = '\0'; | |
5571f1e6 | 1317 | |
4c29afec | 1318 | return 0; |
5571f1e6 DS |
1319 | } |
1320 | ||
1321 | static const char *fuse_get_link(struct dentry *dentry, struct inode *inode, | |
1322 | struct delayed_call *callback) | |
1323 | { | |
1324 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1325 | struct page *page; | |
1326 | int err; | |
1327 | ||
1328 | err = -EIO; | |
1329 | if (is_bad_inode(inode)) | |
1330 | goto out_err; | |
1331 | ||
1332 | if (fc->cache_symlinks) | |
1333 | return page_get_link(dentry, inode, callback); | |
1334 | ||
1335 | err = -ECHILD; | |
1336 | if (!dentry) | |
1337 | goto out_err; | |
1338 | ||
1339 | page = alloc_page(GFP_KERNEL); | |
1340 | err = -ENOMEM; | |
1341 | if (!page) | |
1342 | goto out_err; | |
1343 | ||
1344 | err = fuse_readlink_page(inode, page); | |
1345 | if (err) { | |
1346 | __free_page(page); | |
1347 | goto out_err; | |
1348 | } | |
1349 | ||
1350 | set_delayed_call(callback, page_put_link, page); | |
1351 | ||
1352 | return page_address(page); | |
1353 | ||
1354 | out_err: | |
1355 | return ERR_PTR(err); | |
e5e5558e MS |
1356 | } |
1357 | ||
e5e5558e MS |
1358 | static int fuse_dir_open(struct inode *inode, struct file *file) |
1359 | { | |
91fe96b4 | 1360 | return fuse_open_common(inode, file, true); |
e5e5558e MS |
1361 | } |
1362 | ||
1363 | static int fuse_dir_release(struct inode *inode, struct file *file) | |
1364 | { | |
2e64ff15 | 1365 | fuse_release_common(file, true); |
8b0797a4 MS |
1366 | |
1367 | return 0; | |
e5e5558e MS |
1368 | } |
1369 | ||
02c24a82 JB |
1370 | static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end, |
1371 | int datasync) | |
82547981 | 1372 | { |
a9c2d1e8 MS |
1373 | struct inode *inode = file->f_mapping->host; |
1374 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1375 | int err; | |
1376 | ||
1377 | if (is_bad_inode(inode)) | |
1378 | return -EIO; | |
1379 | ||
1380 | if (fc->no_fsyncdir) | |
1381 | return 0; | |
1382 | ||
1383 | inode_lock(inode); | |
1384 | err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNCDIR); | |
1385 | if (err == -ENOSYS) { | |
1386 | fc->no_fsyncdir = 1; | |
1387 | err = 0; | |
1388 | } | |
1389 | inode_unlock(inode); | |
1390 | ||
1391 | return err; | |
82547981 MS |
1392 | } |
1393 | ||
b18da0c5 MS |
1394 | static long fuse_dir_ioctl(struct file *file, unsigned int cmd, |
1395 | unsigned long arg) | |
1396 | { | |
1397 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1398 | ||
1399 | /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */ | |
1400 | if (fc->minor < 18) | |
1401 | return -ENOTTY; | |
1402 | ||
1403 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR); | |
1404 | } | |
1405 | ||
1406 | static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd, | |
1407 | unsigned long arg) | |
1408 | { | |
1409 | struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host); | |
1410 | ||
1411 | if (fc->minor < 18) | |
1412 | return -ENOTTY; | |
1413 | ||
1414 | return fuse_ioctl_common(file, cmd, arg, | |
1415 | FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR); | |
1416 | } | |
1417 | ||
b0aa7606 | 1418 | static bool update_mtime(unsigned ivalid, bool trust_local_mtime) |
17637cba MS |
1419 | { |
1420 | /* Always update if mtime is explicitly set */ | |
1421 | if (ivalid & ATTR_MTIME_SET) | |
1422 | return true; | |
1423 | ||
b0aa7606 MP |
1424 | /* Or if kernel i_mtime is the official one */ |
1425 | if (trust_local_mtime) | |
1426 | return true; | |
1427 | ||
17637cba MS |
1428 | /* If it's an open(O_TRUNC) or an ftruncate(), don't update */ |
1429 | if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE))) | |
1430 | return false; | |
1431 | ||
1432 | /* In all other cases update */ | |
1433 | return true; | |
1434 | } | |
1435 | ||
8cb08329 EB |
1436 | static void iattr_to_fattr(struct fuse_conn *fc, struct iattr *iattr, |
1437 | struct fuse_setattr_in *arg, bool trust_local_cmtime) | |
9e6268db MS |
1438 | { |
1439 | unsigned ivalid = iattr->ia_valid; | |
9e6268db MS |
1440 | |
1441 | if (ivalid & ATTR_MODE) | |
befc649c | 1442 | arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode; |
9e6268db | 1443 | if (ivalid & ATTR_UID) |
8cb08329 | 1444 | arg->valid |= FATTR_UID, arg->uid = from_kuid(fc->user_ns, iattr->ia_uid); |
9e6268db | 1445 | if (ivalid & ATTR_GID) |
8cb08329 | 1446 | arg->valid |= FATTR_GID, arg->gid = from_kgid(fc->user_ns, iattr->ia_gid); |
9e6268db | 1447 | if (ivalid & ATTR_SIZE) |
befc649c | 1448 | arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size; |
17637cba MS |
1449 | if (ivalid & ATTR_ATIME) { |
1450 | arg->valid |= FATTR_ATIME; | |
befc649c | 1451 | arg->atime = iattr->ia_atime.tv_sec; |
17637cba MS |
1452 | arg->atimensec = iattr->ia_atime.tv_nsec; |
1453 | if (!(ivalid & ATTR_ATIME_SET)) | |
1454 | arg->valid |= FATTR_ATIME_NOW; | |
1455 | } | |
3ad22c62 | 1456 | if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) { |
17637cba | 1457 | arg->valid |= FATTR_MTIME; |
befc649c | 1458 | arg->mtime = iattr->ia_mtime.tv_sec; |
17637cba | 1459 | arg->mtimensec = iattr->ia_mtime.tv_nsec; |
3ad22c62 | 1460 | if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime) |
17637cba | 1461 | arg->valid |= FATTR_MTIME_NOW; |
befc649c | 1462 | } |
3ad22c62 MP |
1463 | if ((ivalid & ATTR_CTIME) && trust_local_cmtime) { |
1464 | arg->valid |= FATTR_CTIME; | |
1465 | arg->ctime = iattr->ia_ctime.tv_sec; | |
1466 | arg->ctimensec = iattr->ia_ctime.tv_nsec; | |
1467 | } | |
9e6268db MS |
1468 | } |
1469 | ||
3be5a52b MS |
1470 | /* |
1471 | * Prevent concurrent writepages on inode | |
1472 | * | |
1473 | * This is done by adding a negative bias to the inode write counter | |
1474 | * and waiting for all pending writes to finish. | |
1475 | */ | |
1476 | void fuse_set_nowrite(struct inode *inode) | |
1477 | { | |
3be5a52b MS |
1478 | struct fuse_inode *fi = get_fuse_inode(inode); |
1479 | ||
5955102c | 1480 | BUG_ON(!inode_is_locked(inode)); |
3be5a52b | 1481 | |
f15ecfef | 1482 | spin_lock(&fi->lock); |
3be5a52b MS |
1483 | BUG_ON(fi->writectr < 0); |
1484 | fi->writectr += FUSE_NOWRITE; | |
f15ecfef | 1485 | spin_unlock(&fi->lock); |
3be5a52b MS |
1486 | wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE); |
1487 | } | |
1488 | ||
1489 | /* | |
1490 | * Allow writepages on inode | |
1491 | * | |
1492 | * Remove the bias from the writecounter and send any queued | |
1493 | * writepages. | |
1494 | */ | |
1495 | static void __fuse_release_nowrite(struct inode *inode) | |
1496 | { | |
1497 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1498 | ||
1499 | BUG_ON(fi->writectr != FUSE_NOWRITE); | |
1500 | fi->writectr = 0; | |
1501 | fuse_flush_writepages(inode); | |
1502 | } | |
1503 | ||
1504 | void fuse_release_nowrite(struct inode *inode) | |
1505 | { | |
f15ecfef | 1506 | struct fuse_inode *fi = get_fuse_inode(inode); |
3be5a52b | 1507 | |
f15ecfef | 1508 | spin_lock(&fi->lock); |
3be5a52b | 1509 | __fuse_release_nowrite(inode); |
f15ecfef | 1510 | spin_unlock(&fi->lock); |
3be5a52b MS |
1511 | } |
1512 | ||
7078187a | 1513 | static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args, |
b0aa7606 MP |
1514 | struct inode *inode, |
1515 | struct fuse_setattr_in *inarg_p, | |
1516 | struct fuse_attr_out *outarg_p) | |
1517 | { | |
d5b48543 MS |
1518 | args->opcode = FUSE_SETATTR; |
1519 | args->nodeid = get_node_id(inode); | |
1520 | args->in_numargs = 1; | |
1521 | args->in_args[0].size = sizeof(*inarg_p); | |
1522 | args->in_args[0].value = inarg_p; | |
1523 | args->out_numargs = 1; | |
1524 | args->out_args[0].size = sizeof(*outarg_p); | |
1525 | args->out_args[0].value = outarg_p; | |
b0aa7606 MP |
1526 | } |
1527 | ||
1528 | /* | |
1529 | * Flush inode->i_mtime to the server | |
1530 | */ | |
ab9e13f7 | 1531 | int fuse_flush_times(struct inode *inode, struct fuse_file *ff) |
b0aa7606 | 1532 | { |
fcee216b | 1533 | struct fuse_mount *fm = get_fuse_mount(inode); |
7078187a | 1534 | FUSE_ARGS(args); |
b0aa7606 MP |
1535 | struct fuse_setattr_in inarg; |
1536 | struct fuse_attr_out outarg; | |
b0aa7606 MP |
1537 | |
1538 | memset(&inarg, 0, sizeof(inarg)); | |
1539 | memset(&outarg, 0, sizeof(outarg)); | |
1540 | ||
ab9e13f7 | 1541 | inarg.valid = FATTR_MTIME; |
b0aa7606 MP |
1542 | inarg.mtime = inode->i_mtime.tv_sec; |
1543 | inarg.mtimensec = inode->i_mtime.tv_nsec; | |
fcee216b | 1544 | if (fm->fc->minor >= 23) { |
ab9e13f7 MP |
1545 | inarg.valid |= FATTR_CTIME; |
1546 | inarg.ctime = inode->i_ctime.tv_sec; | |
1547 | inarg.ctimensec = inode->i_ctime.tv_nsec; | |
1548 | } | |
1e18bda8 MS |
1549 | if (ff) { |
1550 | inarg.valid |= FATTR_FH; | |
1551 | inarg.fh = ff->fh; | |
1552 | } | |
fcee216b | 1553 | fuse_setattr_fill(fm->fc, &args, inode, &inarg, &outarg); |
b0aa7606 | 1554 | |
fcee216b | 1555 | return fuse_simple_request(fm, &args); |
b0aa7606 MP |
1556 | } |
1557 | ||
6f9f1180 MS |
1558 | /* |
1559 | * Set attributes, and at the same time refresh them. | |
1560 | * | |
1561 | * Truncation is slightly complicated, because the 'truncate' request | |
1562 | * may fail, in which case we don't want to touch the mapping. | |
9ffbb916 MS |
1563 | * vmtruncate() doesn't allow for this case, so do the rlimit checking |
1564 | * and the actual truncation by hand. | |
6f9f1180 | 1565 | */ |
62490330 | 1566 | int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, |
efb9fa9e | 1567 | struct file *file) |
9e6268db | 1568 | { |
62490330 | 1569 | struct inode *inode = d_inode(dentry); |
fcee216b MR |
1570 | struct fuse_mount *fm = get_fuse_mount(inode); |
1571 | struct fuse_conn *fc = fm->fc; | |
06a7c3c2 | 1572 | struct fuse_inode *fi = get_fuse_inode(inode); |
7078187a | 1573 | FUSE_ARGS(args); |
9e6268db MS |
1574 | struct fuse_setattr_in inarg; |
1575 | struct fuse_attr_out outarg; | |
3be5a52b | 1576 | bool is_truncate = false; |
8373200b | 1577 | bool is_wb = fc->writeback_cache; |
3be5a52b | 1578 | loff_t oldsize; |
9e6268db | 1579 | int err; |
3ad22c62 | 1580 | bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode); |
6ae330ca | 1581 | bool fault_blocked = false; |
9e6268db | 1582 | |
29433a29 | 1583 | if (!fc->default_permissions) |
db78b877 CH |
1584 | attr->ia_valid |= ATTR_FORCE; |
1585 | ||
31051c85 | 1586 | err = setattr_prepare(dentry, attr); |
db78b877 CH |
1587 | if (err) |
1588 | return err; | |
1e9a4ed9 | 1589 | |
6ae330ca VG |
1590 | if (attr->ia_valid & ATTR_SIZE) { |
1591 | if (WARN_ON(!S_ISREG(inode->i_mode))) | |
1592 | return -EIO; | |
1593 | is_truncate = true; | |
1594 | } | |
1595 | ||
1596 | if (FUSE_IS_DAX(inode) && is_truncate) { | |
1597 | down_write(&fi->i_mmap_sem); | |
1598 | fault_blocked = true; | |
1599 | err = fuse_dax_break_layouts(inode, 0, 0); | |
1600 | if (err) { | |
1601 | up_write(&fi->i_mmap_sem); | |
1602 | return err; | |
1603 | } | |
1604 | } | |
1605 | ||
8d56addd | 1606 | if (attr->ia_valid & ATTR_OPEN) { |
df0e91d4 MS |
1607 | /* This is coming from open(..., ... | O_TRUNC); */ |
1608 | WARN_ON(!(attr->ia_valid & ATTR_SIZE)); | |
1609 | WARN_ON(attr->ia_size != 0); | |
1610 | if (fc->atomic_o_trunc) { | |
1611 | /* | |
1612 | * No need to send request to userspace, since actual | |
1613 | * truncation has already been done by OPEN. But still | |
1614 | * need to truncate page cache. | |
1615 | */ | |
1616 | i_size_write(inode, 0); | |
1617 | truncate_pagecache(inode, 0); | |
6ae330ca | 1618 | goto out; |
df0e91d4 | 1619 | } |
8d56addd MS |
1620 | file = NULL; |
1621 | } | |
6ff958ed | 1622 | |
b24e7598 MS |
1623 | /* Flush dirty data/metadata before non-truncate SETATTR */ |
1624 | if (is_wb && S_ISREG(inode->i_mode) && | |
1625 | attr->ia_valid & | |
1626 | (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_MTIME_SET | | |
1627 | ATTR_TIMES_SET)) { | |
1628 | err = write_inode_now(inode, true); | |
1629 | if (err) | |
1630 | return err; | |
1631 | ||
1632 | fuse_set_nowrite(inode); | |
1633 | fuse_release_nowrite(inode); | |
1634 | } | |
1635 | ||
06a7c3c2 | 1636 | if (is_truncate) { |
3be5a52b | 1637 | fuse_set_nowrite(inode); |
06a7c3c2 | 1638 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
3ad22c62 MP |
1639 | if (trust_local_cmtime && attr->ia_size != inode->i_size) |
1640 | attr->ia_valid |= ATTR_MTIME | ATTR_CTIME; | |
06a7c3c2 | 1641 | } |
3be5a52b | 1642 | |
9e6268db | 1643 | memset(&inarg, 0, sizeof(inarg)); |
0e9663ee | 1644 | memset(&outarg, 0, sizeof(outarg)); |
8cb08329 | 1645 | iattr_to_fattr(fc, attr, &inarg, trust_local_cmtime); |
49d4914f MS |
1646 | if (file) { |
1647 | struct fuse_file *ff = file->private_data; | |
1648 | inarg.valid |= FATTR_FH; | |
1649 | inarg.fh = ff->fh; | |
1650 | } | |
31792161 VG |
1651 | |
1652 | /* Kill suid/sgid for non-directory chown unconditionally */ | |
1653 | if (fc->handle_killpriv_v2 && !S_ISDIR(inode->i_mode) && | |
1654 | attr->ia_valid & (ATTR_UID | ATTR_GID)) | |
1655 | inarg.valid |= FATTR_KILL_SUIDGID; | |
1656 | ||
f3332114 MS |
1657 | if (attr->ia_valid & ATTR_SIZE) { |
1658 | /* For mandatory locking in truncate */ | |
1659 | inarg.valid |= FATTR_LOCKOWNER; | |
1660 | inarg.lock_owner = fuse_lock_owner_id(fc, current->files); | |
31792161 VG |
1661 | |
1662 | /* Kill suid/sgid for truncate only if no CAP_FSETID */ | |
1663 | if (fc->handle_killpriv_v2 && !capable(CAP_FSETID)) | |
1664 | inarg.valid |= FATTR_KILL_SUIDGID; | |
f3332114 | 1665 | } |
7078187a | 1666 | fuse_setattr_fill(fc, &args, inode, &inarg, &outarg); |
fcee216b | 1667 | err = fuse_simple_request(fm, &args); |
e00d2c2d MS |
1668 | if (err) { |
1669 | if (err == -EINTR) | |
1670 | fuse_invalidate_attr(inode); | |
3be5a52b | 1671 | goto error; |
e00d2c2d | 1672 | } |
9e6268db | 1673 | |
eb59bd17 MS |
1674 | if (fuse_invalid_attr(&outarg.attr) || |
1675 | (inode->i_mode ^ outarg.attr.mode) & S_IFMT) { | |
e00d2c2d | 1676 | make_bad_inode(inode); |
3be5a52b MS |
1677 | err = -EIO; |
1678 | goto error; | |
1679 | } | |
1680 | ||
f15ecfef | 1681 | spin_lock(&fi->lock); |
b0aa7606 | 1682 | /* the kernel maintains i_mtime locally */ |
3ad22c62 MP |
1683 | if (trust_local_cmtime) { |
1684 | if (attr->ia_valid & ATTR_MTIME) | |
1685 | inode->i_mtime = attr->ia_mtime; | |
1686 | if (attr->ia_valid & ATTR_CTIME) | |
1687 | inode->i_ctime = attr->ia_ctime; | |
1e18bda8 | 1688 | /* FIXME: clear I_DIRTY_SYNC? */ |
b0aa7606 MP |
1689 | } |
1690 | ||
3be5a52b MS |
1691 | fuse_change_attributes_common(inode, &outarg.attr, |
1692 | attr_timeout(&outarg)); | |
1693 | oldsize = inode->i_size; | |
8373200b PE |
1694 | /* see the comment in fuse_change_attributes() */ |
1695 | if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) | |
1696 | i_size_write(inode, outarg.attr.size); | |
3be5a52b MS |
1697 | |
1698 | if (is_truncate) { | |
f15ecfef | 1699 | /* NOTE: this may release/reacquire fi->lock */ |
3be5a52b MS |
1700 | __fuse_release_nowrite(inode); |
1701 | } | |
f15ecfef | 1702 | spin_unlock(&fi->lock); |
3be5a52b MS |
1703 | |
1704 | /* | |
1705 | * Only call invalidate_inode_pages2() after removing | |
1706 | * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. | |
1707 | */ | |
8373200b PE |
1708 | if ((is_truncate || !is_wb) && |
1709 | S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { | |
7caef267 | 1710 | truncate_pagecache(inode, outarg.attr.size); |
3be5a52b | 1711 | invalidate_inode_pages2(inode->i_mapping); |
e00d2c2d MS |
1712 | } |
1713 | ||
06a7c3c2 | 1714 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
6ae330ca VG |
1715 | out: |
1716 | if (fault_blocked) | |
1717 | up_write(&fi->i_mmap_sem); | |
1718 | ||
e00d2c2d | 1719 | return 0; |
3be5a52b MS |
1720 | |
1721 | error: | |
1722 | if (is_truncate) | |
1723 | fuse_release_nowrite(inode); | |
1724 | ||
06a7c3c2 | 1725 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
6ae330ca VG |
1726 | |
1727 | if (fault_blocked) | |
1728 | up_write(&fi->i_mmap_sem); | |
3be5a52b | 1729 | return err; |
9e6268db MS |
1730 | } |
1731 | ||
49d4914f MS |
1732 | static int fuse_setattr(struct dentry *entry, struct iattr *attr) |
1733 | { | |
2b0143b5 | 1734 | struct inode *inode = d_inode(entry); |
5e940c1d | 1735 | struct fuse_conn *fc = get_fuse_conn(inode); |
a09f99ed | 1736 | struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL; |
5e2b8828 | 1737 | int ret; |
efb9fa9e MP |
1738 | |
1739 | if (!fuse_allow_current_process(get_fuse_conn(inode))) | |
1740 | return -EACCES; | |
1741 | ||
a09f99ed | 1742 | if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) { |
a09f99ed MS |
1743 | attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | |
1744 | ATTR_MODE); | |
5e940c1d | 1745 | |
a09f99ed | 1746 | /* |
5e940c1d MS |
1747 | * The only sane way to reliably kill suid/sgid is to do it in |
1748 | * the userspace filesystem | |
1749 | * | |
1750 | * This should be done on write(), truncate() and chown(). | |
a09f99ed | 1751 | */ |
5e940c1d | 1752 | if (!fc->handle_killpriv) { |
5e940c1d MS |
1753 | /* |
1754 | * ia_mode calculation may have used stale i_mode. | |
1755 | * Refresh and recalculate. | |
1756 | */ | |
1757 | ret = fuse_do_getattr(inode, NULL, file); | |
1758 | if (ret) | |
1759 | return ret; | |
1760 | ||
1761 | attr->ia_mode = inode->i_mode; | |
c01638f5 | 1762 | if (inode->i_mode & S_ISUID) { |
5e940c1d MS |
1763 | attr->ia_valid |= ATTR_MODE; |
1764 | attr->ia_mode &= ~S_ISUID; | |
1765 | } | |
c01638f5 | 1766 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { |
5e940c1d MS |
1767 | attr->ia_valid |= ATTR_MODE; |
1768 | attr->ia_mode &= ~S_ISGID; | |
1769 | } | |
a09f99ed MS |
1770 | } |
1771 | } | |
1772 | if (!attr->ia_valid) | |
1773 | return 0; | |
5e2b8828 | 1774 | |
abb5a14f | 1775 | ret = fuse_do_setattr(entry, attr, file); |
5e2b8828 | 1776 | if (!ret) { |
60bcc88a SF |
1777 | /* |
1778 | * If filesystem supports acls it may have updated acl xattrs in | |
1779 | * the filesystem, so forget cached acls for the inode. | |
1780 | */ | |
1781 | if (fc->posix_acl) | |
1782 | forget_all_cached_acls(inode); | |
1783 | ||
5e2b8828 MS |
1784 | /* Directory mode changed, may need to revalidate access */ |
1785 | if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE)) | |
1786 | fuse_invalidate_entry_cache(entry); | |
1787 | } | |
1788 | return ret; | |
49d4914f MS |
1789 | } |
1790 | ||
a528d35e DH |
1791 | static int fuse_getattr(const struct path *path, struct kstat *stat, |
1792 | u32 request_mask, unsigned int flags) | |
e5e5558e | 1793 | { |
a528d35e | 1794 | struct inode *inode = d_inode(path->dentry); |
244f6385 | 1795 | struct fuse_conn *fc = get_fuse_conn(inode); |
244f6385 | 1796 | |
5157da2c MS |
1797 | if (!fuse_allow_current_process(fc)) { |
1798 | if (!request_mask) { | |
1799 | /* | |
1800 | * If user explicitly requested *nothing* then don't | |
1801 | * error out, but return st_dev only. | |
1802 | */ | |
1803 | stat->result_mask = 0; | |
1804 | stat->dev = inode->i_sb->s_dev; | |
1805 | return 0; | |
1806 | } | |
244f6385 | 1807 | return -EACCES; |
5157da2c | 1808 | } |
244f6385 | 1809 | |
2f1e8196 | 1810 | return fuse_update_get_attr(inode, NULL, stat, request_mask, flags); |
e5e5558e MS |
1811 | } |
1812 | ||
754661f1 | 1813 | static const struct inode_operations fuse_dir_inode_operations = { |
e5e5558e | 1814 | .lookup = fuse_lookup, |
9e6268db MS |
1815 | .mkdir = fuse_mkdir, |
1816 | .symlink = fuse_symlink, | |
1817 | .unlink = fuse_unlink, | |
1818 | .rmdir = fuse_rmdir, | |
2773bf00 | 1819 | .rename = fuse_rename2, |
9e6268db MS |
1820 | .link = fuse_link, |
1821 | .setattr = fuse_setattr, | |
1822 | .create = fuse_create, | |
c8ccbe03 | 1823 | .atomic_open = fuse_atomic_open, |
9e6268db | 1824 | .mknod = fuse_mknod, |
e5e5558e MS |
1825 | .permission = fuse_permission, |
1826 | .getattr = fuse_getattr, | |
92a8780e | 1827 | .listxattr = fuse_listxattr, |
60bcc88a SF |
1828 | .get_acl = fuse_get_acl, |
1829 | .set_acl = fuse_set_acl, | |
e5e5558e MS |
1830 | }; |
1831 | ||
4b6f5d20 | 1832 | static const struct file_operations fuse_dir_operations = { |
b6aeaded | 1833 | .llseek = generic_file_llseek, |
e5e5558e | 1834 | .read = generic_read_dir, |
d9b3dbdc | 1835 | .iterate_shared = fuse_readdir, |
e5e5558e MS |
1836 | .open = fuse_dir_open, |
1837 | .release = fuse_dir_release, | |
82547981 | 1838 | .fsync = fuse_dir_fsync, |
b18da0c5 MS |
1839 | .unlocked_ioctl = fuse_dir_ioctl, |
1840 | .compat_ioctl = fuse_dir_compat_ioctl, | |
e5e5558e MS |
1841 | }; |
1842 | ||
754661f1 | 1843 | static const struct inode_operations fuse_common_inode_operations = { |
9e6268db | 1844 | .setattr = fuse_setattr, |
e5e5558e MS |
1845 | .permission = fuse_permission, |
1846 | .getattr = fuse_getattr, | |
92a8780e | 1847 | .listxattr = fuse_listxattr, |
60bcc88a SF |
1848 | .get_acl = fuse_get_acl, |
1849 | .set_acl = fuse_set_acl, | |
e5e5558e MS |
1850 | }; |
1851 | ||
754661f1 | 1852 | static const struct inode_operations fuse_symlink_inode_operations = { |
9e6268db | 1853 | .setattr = fuse_setattr, |
6b255391 | 1854 | .get_link = fuse_get_link, |
e5e5558e | 1855 | .getattr = fuse_getattr, |
92a8780e | 1856 | .listxattr = fuse_listxattr, |
e5e5558e MS |
1857 | }; |
1858 | ||
1859 | void fuse_init_common(struct inode *inode) | |
1860 | { | |
1861 | inode->i_op = &fuse_common_inode_operations; | |
1862 | } | |
1863 | ||
1864 | void fuse_init_dir(struct inode *inode) | |
1865 | { | |
ab2257e9 MS |
1866 | struct fuse_inode *fi = get_fuse_inode(inode); |
1867 | ||
e5e5558e MS |
1868 | inode->i_op = &fuse_dir_inode_operations; |
1869 | inode->i_fop = &fuse_dir_operations; | |
ab2257e9 MS |
1870 | |
1871 | spin_lock_init(&fi->rdc.lock); | |
1872 | fi->rdc.cached = false; | |
1873 | fi->rdc.size = 0; | |
1874 | fi->rdc.pos = 0; | |
1875 | fi->rdc.version = 0; | |
e5e5558e MS |
1876 | } |
1877 | ||
5571f1e6 DS |
1878 | static int fuse_symlink_readpage(struct file *null, struct page *page) |
1879 | { | |
1880 | int err = fuse_readlink_page(page->mapping->host, page); | |
1881 | ||
1882 | if (!err) | |
1883 | SetPageUptodate(page); | |
1884 | ||
1885 | unlock_page(page); | |
1886 | ||
1887 | return err; | |
1888 | } | |
1889 | ||
1890 | static const struct address_space_operations fuse_symlink_aops = { | |
1891 | .readpage = fuse_symlink_readpage, | |
1892 | }; | |
1893 | ||
e5e5558e MS |
1894 | void fuse_init_symlink(struct inode *inode) |
1895 | { | |
1896 | inode->i_op = &fuse_symlink_inode_operations; | |
5571f1e6 DS |
1897 | inode->i_data.a_ops = &fuse_symlink_aops; |
1898 | inode_nohighmem(inode); | |
e5e5558e | 1899 | } |