1 /* 2 FUSE: Filesystem in Userspace 3 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> 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/slab.h> 13 #include <linux/file.h> 14 #include <linux/seq_file.h> 15 #include <linux/init.h> 16 #include <linux/module.h> 17 #include <linux/moduleparam.h> 18 #include <linux/parser.h> 19 #include <linux/statfs.h> 20 #include <linux/random.h> 21 #include <linux/sched.h> 22 #include <linux/exportfs.h> 23 #include <linux/posix_acl.h> 24 #include <linux/pid_namespace.h> 25 26 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); 27 MODULE_DESCRIPTION("Filesystem in Userspace"); 28 MODULE_LICENSE("GPL"); 29 30 static struct kmem_cache *fuse_inode_cachep; 31 struct list_head fuse_conn_list; 32 DEFINE_MUTEX(fuse_mutex); 33 34 static int set_global_limit(const char *val, struct kernel_param *kp); 35 36 unsigned max_user_bgreq; 37 module_param_call(max_user_bgreq, set_global_limit, param_get_uint, 38 &max_user_bgreq, 0644); 39 __MODULE_PARM_TYPE(max_user_bgreq, "uint"); 40 MODULE_PARM_DESC(max_user_bgreq, 41 "Global limit for the maximum number of backgrounded requests an " 42 "unprivileged user can set"); 43 44 unsigned max_user_congthresh; 45 module_param_call(max_user_congthresh, set_global_limit, param_get_uint, 46 &max_user_congthresh, 0644); 47 __MODULE_PARM_TYPE(max_user_congthresh, "uint"); 48 MODULE_PARM_DESC(max_user_congthresh, 49 "Global limit for the maximum congestion threshold an " 50 "unprivileged user can set"); 51 52 #define FUSE_SUPER_MAGIC 0x65735546 53 54 #define FUSE_DEFAULT_BLKSIZE 512 55 56 /** Maximum number of outstanding background requests */ 57 #define FUSE_DEFAULT_MAX_BACKGROUND 12 58 59 /** Congestion starts at 75% of maximum */ 60 #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) 61 62 struct fuse_mount_data { 63 int fd; 64 unsigned rootmode; 65 kuid_t user_id; 66 kgid_t group_id; 67 unsigned fd_present:1; 68 unsigned rootmode_present:1; 69 unsigned user_id_present:1; 70 unsigned group_id_present:1; 71 unsigned default_permissions:1; 72 unsigned allow_other:1; 73 unsigned max_read; 74 unsigned blksize; 75 }; 76 77 struct fuse_forget_link *fuse_alloc_forget(void) 78 { 79 return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); 80 } 81 82 static struct inode *fuse_alloc_inode(struct super_block *sb) 83 { 84 struct inode *inode; 85 struct fuse_inode *fi; 86 87 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); 88 if (!inode) 89 return NULL; 90 91 fi = get_fuse_inode(inode); 92 fi->i_time = 0; 93 fi->nodeid = 0; 94 fi->nlookup = 0; 95 fi->attr_version = 0; 96 fi->writectr = 0; 97 fi->orig_ino = 0; 98 fi->state = 0; 99 INIT_LIST_HEAD(&fi->write_files); 100 INIT_LIST_HEAD(&fi->queued_writes); 101 INIT_LIST_HEAD(&fi->writepages); 102 init_waitqueue_head(&fi->page_waitq); 103 mutex_init(&fi->mutex); 104 fi->forget = fuse_alloc_forget(); 105 if (!fi->forget) { 106 kmem_cache_free(fuse_inode_cachep, inode); 107 return NULL; 108 } 109 110 return inode; 111 } 112 113 static void fuse_i_callback(struct rcu_head *head) 114 { 115 struct inode *inode = container_of(head, struct inode, i_rcu); 116 kmem_cache_free(fuse_inode_cachep, inode); 117 } 118 119 static void fuse_destroy_inode(struct inode *inode) 120 { 121 struct fuse_inode *fi = get_fuse_inode(inode); 122 BUG_ON(!list_empty(&fi->write_files)); 123 BUG_ON(!list_empty(&fi->queued_writes)); 124 mutex_destroy(&fi->mutex); 125 kfree(fi->forget); 126 call_rcu(&inode->i_rcu, fuse_i_callback); 127 } 128 129 static void fuse_evict_inode(struct inode *inode) 130 { 131 truncate_inode_pages_final(&inode->i_data); 132 clear_inode(inode); 133 if (inode->i_sb->s_flags & MS_ACTIVE) { 134 struct fuse_conn *fc = get_fuse_conn(inode); 135 struct fuse_inode *fi = get_fuse_inode(inode); 136 fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); 137 fi->forget = NULL; 138 } 139 } 140 141 static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) 142 { 143 sync_filesystem(sb); 144 if (*flags & MS_MANDLOCK) 145 return -EINVAL; 146 147 return 0; 148 } 149 150 /* 151 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down 152 * so that it will fit. 153 */ 154 static ino_t fuse_squash_ino(u64 ino64) 155 { 156 ino_t ino = (ino_t) ino64; 157 if (sizeof(ino_t) < sizeof(u64)) 158 ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; 159 return ino; 160 } 161 162 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, 163 u64 attr_valid) 164 { 165 struct fuse_conn *fc = get_fuse_conn(inode); 166 struct fuse_inode *fi = get_fuse_inode(inode); 167 168 fi->attr_version = ++fc->attr_version; 169 fi->i_time = attr_valid; 170 171 inode->i_ino = fuse_squash_ino(attr->ino); 172 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); 173 set_nlink(inode, attr->nlink); 174 inode->i_uid = make_kuid(&init_user_ns, attr->uid); 175 inode->i_gid = make_kgid(&init_user_ns, attr->gid); 176 inode->i_blocks = attr->blocks; 177 inode->i_atime.tv_sec = attr->atime; 178 inode->i_atime.tv_nsec = attr->atimensec; 179 /* mtime from server may be stale due to local buffered write */ 180 if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { 181 inode->i_mtime.tv_sec = attr->mtime; 182 inode->i_mtime.tv_nsec = attr->mtimensec; 183 inode->i_ctime.tv_sec = attr->ctime; 184 inode->i_ctime.tv_nsec = attr->ctimensec; 185 } 186 187 if (attr->blksize != 0) 188 inode->i_blkbits = ilog2(attr->blksize); 189 else 190 inode->i_blkbits = inode->i_sb->s_blocksize_bits; 191 192 /* 193 * Don't set the sticky bit in i_mode, unless we want the VFS 194 * to check permissions. This prevents failures due to the 195 * check in may_delete(). 196 */ 197 fi->orig_i_mode = inode->i_mode; 198 if (!fc->default_permissions) 199 inode->i_mode &= ~S_ISVTX; 200 201 fi->orig_ino = attr->ino; 202 } 203 204 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, 205 u64 attr_valid, u64 attr_version) 206 { 207 struct fuse_conn *fc = get_fuse_conn(inode); 208 struct fuse_inode *fi = get_fuse_inode(inode); 209 bool is_wb = fc->writeback_cache; 210 loff_t oldsize; 211 struct timespec old_mtime; 212 213 spin_lock(&fc->lock); 214 if ((attr_version != 0 && fi->attr_version > attr_version) || 215 test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { 216 spin_unlock(&fc->lock); 217 return; 218 } 219 220 old_mtime = inode->i_mtime; 221 fuse_change_attributes_common(inode, attr, attr_valid); 222 223 oldsize = inode->i_size; 224 /* 225 * In case of writeback_cache enabled, the cached writes beyond EOF 226 * extend local i_size without keeping userspace server in sync. So, 227 * attr->size coming from server can be stale. We cannot trust it. 228 */ 229 if (!is_wb || !S_ISREG(inode->i_mode)) 230 i_size_write(inode, attr->size); 231 spin_unlock(&fc->lock); 232 233 if (!is_wb && S_ISREG(inode->i_mode)) { 234 bool inval = false; 235 236 if (oldsize != attr->size) { 237 truncate_pagecache(inode, attr->size); 238 inval = true; 239 } else if (fc->auto_inval_data) { 240 struct timespec new_mtime = { 241 .tv_sec = attr->mtime, 242 .tv_nsec = attr->mtimensec, 243 }; 244 245 /* 246 * Auto inval mode also checks and invalidates if mtime 247 * has changed. 248 */ 249 if (!timespec_equal(&old_mtime, &new_mtime)) 250 inval = true; 251 } 252 253 if (inval) 254 invalidate_inode_pages2(inode->i_mapping); 255 } 256 } 257 258 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) 259 { 260 inode->i_mode = attr->mode & S_IFMT; 261 inode->i_size = attr->size; 262 inode->i_mtime.tv_sec = attr->mtime; 263 inode->i_mtime.tv_nsec = attr->mtimensec; 264 inode->i_ctime.tv_sec = attr->ctime; 265 inode->i_ctime.tv_nsec = attr->ctimensec; 266 if (S_ISREG(inode->i_mode)) { 267 fuse_init_common(inode); 268 fuse_init_file_inode(inode); 269 } else if (S_ISDIR(inode->i_mode)) 270 fuse_init_dir(inode); 271 else if (S_ISLNK(inode->i_mode)) 272 fuse_init_symlink(inode); 273 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || 274 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { 275 fuse_init_common(inode); 276 init_special_inode(inode, inode->i_mode, 277 new_decode_dev(attr->rdev)); 278 } else 279 BUG(); 280 } 281 282 int fuse_inode_eq(struct inode *inode, void *_nodeidp) 283 { 284 u64 nodeid = *(u64 *) _nodeidp; 285 if (get_node_id(inode) == nodeid) 286 return 1; 287 else 288 return 0; 289 } 290 291 static int fuse_inode_set(struct inode *inode, void *_nodeidp) 292 { 293 u64 nodeid = *(u64 *) _nodeidp; 294 get_fuse_inode(inode)->nodeid = nodeid; 295 return 0; 296 } 297 298 struct inode *fuse_iget(struct super_block *sb, u64 nodeid, 299 int generation, struct fuse_attr *attr, 300 u64 attr_valid, u64 attr_version) 301 { 302 struct inode *inode; 303 struct fuse_inode *fi; 304 struct fuse_conn *fc = get_fuse_conn_super(sb); 305 306 retry: 307 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); 308 if (!inode) 309 return NULL; 310 311 if ((inode->i_state & I_NEW)) { 312 inode->i_flags |= S_NOATIME; 313 if (!fc->writeback_cache || !S_ISREG(attr->mode)) 314 inode->i_flags |= S_NOCMTIME; 315 inode->i_generation = generation; 316 fuse_init_inode(inode, attr); 317 unlock_new_inode(inode); 318 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { 319 /* Inode has changed type, any I/O on the old should fail */ 320 make_bad_inode(inode); 321 iput(inode); 322 goto retry; 323 } 324 325 fi = get_fuse_inode(inode); 326 spin_lock(&fc->lock); 327 fi->nlookup++; 328 spin_unlock(&fc->lock); 329 fuse_change_attributes(inode, attr, attr_valid, attr_version); 330 331 return inode; 332 } 333 334 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, 335 loff_t offset, loff_t len) 336 { 337 struct inode *inode; 338 pgoff_t pg_start; 339 pgoff_t pg_end; 340 341 inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); 342 if (!inode) 343 return -ENOENT; 344 345 fuse_invalidate_attr(inode); 346 forget_all_cached_acls(inode); 347 if (offset >= 0) { 348 pg_start = offset >> PAGE_SHIFT; 349 if (len <= 0) 350 pg_end = -1; 351 else 352 pg_end = (offset + len - 1) >> PAGE_SHIFT; 353 invalidate_inode_pages2_range(inode->i_mapping, 354 pg_start, pg_end); 355 } 356 iput(inode); 357 return 0; 358 } 359 360 void fuse_lock_inode(struct inode *inode) 361 { 362 if (!get_fuse_conn(inode)->parallel_dirops) 363 mutex_lock(&get_fuse_inode(inode)->mutex); 364 } 365 366 void fuse_unlock_inode(struct inode *inode) 367 { 368 if (!get_fuse_conn(inode)->parallel_dirops) 369 mutex_unlock(&get_fuse_inode(inode)->mutex); 370 } 371 372 static void fuse_umount_begin(struct super_block *sb) 373 { 374 fuse_abort_conn(get_fuse_conn_super(sb)); 375 } 376 377 static void fuse_send_destroy(struct fuse_conn *fc) 378 { 379 struct fuse_req *req = fc->destroy_req; 380 if (req && fc->conn_init) { 381 fc->destroy_req = NULL; 382 req->in.h.opcode = FUSE_DESTROY; 383 __set_bit(FR_FORCE, &req->flags); 384 __clear_bit(FR_BACKGROUND, &req->flags); 385 fuse_request_send(fc, req); 386 fuse_put_request(fc, req); 387 } 388 } 389 390 static void fuse_put_super(struct super_block *sb) 391 { 392 struct fuse_conn *fc = get_fuse_conn_super(sb); 393 394 fuse_send_destroy(fc); 395 396 fuse_abort_conn(fc); 397 mutex_lock(&fuse_mutex); 398 list_del(&fc->entry); 399 fuse_ctl_remove_conn(fc); 400 mutex_unlock(&fuse_mutex); 401 402 fuse_conn_put(fc); 403 } 404 405 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) 406 { 407 stbuf->f_type = FUSE_SUPER_MAGIC; 408 stbuf->f_bsize = attr->bsize; 409 stbuf->f_frsize = attr->frsize; 410 stbuf->f_blocks = attr->blocks; 411 stbuf->f_bfree = attr->bfree; 412 stbuf->f_bavail = attr->bavail; 413 stbuf->f_files = attr->files; 414 stbuf->f_ffree = attr->ffree; 415 stbuf->f_namelen = attr->namelen; 416 /* fsid is left zero */ 417 } 418 419 static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) 420 { 421 struct super_block *sb = dentry->d_sb; 422 struct fuse_conn *fc = get_fuse_conn_super(sb); 423 FUSE_ARGS(args); 424 struct fuse_statfs_out outarg; 425 int err; 426 427 if (!fuse_allow_current_process(fc)) { 428 buf->f_type = FUSE_SUPER_MAGIC; 429 return 0; 430 } 431 432 memset(&outarg, 0, sizeof(outarg)); 433 args.in.numargs = 0; 434 args.in.h.opcode = FUSE_STATFS; 435 args.in.h.nodeid = get_node_id(d_inode(dentry)); 436 args.out.numargs = 1; 437 args.out.args[0].size = sizeof(outarg); 438 args.out.args[0].value = &outarg; 439 err = fuse_simple_request(fc, &args); 440 if (!err) 441 convert_fuse_statfs(buf, &outarg.st); 442 return err; 443 } 444 445 enum { 446 OPT_FD, 447 OPT_ROOTMODE, 448 OPT_USER_ID, 449 OPT_GROUP_ID, 450 OPT_DEFAULT_PERMISSIONS, 451 OPT_ALLOW_OTHER, 452 OPT_MAX_READ, 453 OPT_BLKSIZE, 454 OPT_ERR 455 }; 456 457 static const match_table_t tokens = { 458 {OPT_FD, "fd=%u"}, 459 {OPT_ROOTMODE, "rootmode=%o"}, 460 {OPT_USER_ID, "user_id=%u"}, 461 {OPT_GROUP_ID, "group_id=%u"}, 462 {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, 463 {OPT_ALLOW_OTHER, "allow_other"}, 464 {OPT_MAX_READ, "max_read=%u"}, 465 {OPT_BLKSIZE, "blksize=%u"}, 466 {OPT_ERR, NULL} 467 }; 468 469 static int fuse_match_uint(substring_t *s, unsigned int *res) 470 { 471 int err = -ENOMEM; 472 char *buf = match_strdup(s); 473 if (buf) { 474 err = kstrtouint(buf, 10, res); 475 kfree(buf); 476 } 477 return err; 478 } 479 480 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) 481 { 482 char *p; 483 memset(d, 0, sizeof(struct fuse_mount_data)); 484 d->max_read = ~0; 485 d->blksize = FUSE_DEFAULT_BLKSIZE; 486 487 while ((p = strsep(&opt, ",")) != NULL) { 488 int token; 489 int value; 490 unsigned uv; 491 substring_t args[MAX_OPT_ARGS]; 492 if (!*p) 493 continue; 494 495 token = match_token(p, tokens, args); 496 switch (token) { 497 case OPT_FD: 498 if (match_int(&args[0], &value)) 499 return 0; 500 d->fd = value; 501 d->fd_present = 1; 502 break; 503 504 case OPT_ROOTMODE: 505 if (match_octal(&args[0], &value)) 506 return 0; 507 if (!fuse_valid_type(value)) 508 return 0; 509 d->rootmode = value; 510 d->rootmode_present = 1; 511 break; 512 513 case OPT_USER_ID: 514 if (fuse_match_uint(&args[0], &uv)) 515 return 0; 516 d->user_id = make_kuid(current_user_ns(), uv); 517 if (!uid_valid(d->user_id)) 518 return 0; 519 d->user_id_present = 1; 520 break; 521 522 case OPT_GROUP_ID: 523 if (fuse_match_uint(&args[0], &uv)) 524 return 0; 525 d->group_id = make_kgid(current_user_ns(), uv); 526 if (!gid_valid(d->group_id)) 527 return 0; 528 d->group_id_present = 1; 529 break; 530 531 case OPT_DEFAULT_PERMISSIONS: 532 d->default_permissions = 1; 533 break; 534 535 case OPT_ALLOW_OTHER: 536 d->allow_other = 1; 537 break; 538 539 case OPT_MAX_READ: 540 if (match_int(&args[0], &value)) 541 return 0; 542 d->max_read = value; 543 break; 544 545 case OPT_BLKSIZE: 546 if (!is_bdev || match_int(&args[0], &value)) 547 return 0; 548 d->blksize = value; 549 break; 550 551 default: 552 return 0; 553 } 554 } 555 556 if (!d->fd_present || !d->rootmode_present || 557 !d->user_id_present || !d->group_id_present) 558 return 0; 559 560 return 1; 561 } 562 563 static int fuse_show_options(struct seq_file *m, struct dentry *root) 564 { 565 struct super_block *sb = root->d_sb; 566 struct fuse_conn *fc = get_fuse_conn_super(sb); 567 568 seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id)); 569 seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id)); 570 if (fc->default_permissions) 571 seq_puts(m, ",default_permissions"); 572 if (fc->allow_other) 573 seq_puts(m, ",allow_other"); 574 if (fc->max_read != ~0) 575 seq_printf(m, ",max_read=%u", fc->max_read); 576 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) 577 seq_printf(m, ",blksize=%lu", sb->s_blocksize); 578 return 0; 579 } 580 581 static void fuse_iqueue_init(struct fuse_iqueue *fiq) 582 { 583 memset(fiq, 0, sizeof(struct fuse_iqueue)); 584 init_waitqueue_head(&fiq->waitq); 585 INIT_LIST_HEAD(&fiq->pending); 586 INIT_LIST_HEAD(&fiq->interrupts); 587 fiq->forget_list_tail = &fiq->forget_list_head; 588 fiq->connected = 1; 589 } 590 591 static void fuse_pqueue_init(struct fuse_pqueue *fpq) 592 { 593 memset(fpq, 0, sizeof(struct fuse_pqueue)); 594 spin_lock_init(&fpq->lock); 595 INIT_LIST_HEAD(&fpq->processing); 596 INIT_LIST_HEAD(&fpq->io); 597 fpq->connected = 1; 598 } 599 600 void fuse_conn_init(struct fuse_conn *fc) 601 { 602 memset(fc, 0, sizeof(*fc)); 603 spin_lock_init(&fc->lock); 604 init_rwsem(&fc->killsb); 605 refcount_set(&fc->count, 1); 606 atomic_set(&fc->dev_count, 1); 607 init_waitqueue_head(&fc->blocked_waitq); 608 init_waitqueue_head(&fc->reserved_req_waitq); 609 fuse_iqueue_init(&fc->iq); 610 INIT_LIST_HEAD(&fc->bg_queue); 611 INIT_LIST_HEAD(&fc->entry); 612 INIT_LIST_HEAD(&fc->devices); 613 atomic_set(&fc->num_waiting, 0); 614 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; 615 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; 616 fc->khctr = 0; 617 fc->polled_files = RB_ROOT; 618 fc->blocked = 0; 619 fc->initialized = 0; 620 fc->connected = 1; 621 fc->attr_version = 1; 622 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); 623 fc->pid_ns = get_pid_ns(task_active_pid_ns(current)); 624 } 625 EXPORT_SYMBOL_GPL(fuse_conn_init); 626 627 void fuse_conn_put(struct fuse_conn *fc) 628 { 629 if (refcount_dec_and_test(&fc->count)) { 630 if (fc->destroy_req) 631 fuse_request_free(fc->destroy_req); 632 put_pid_ns(fc->pid_ns); 633 fc->release(fc); 634 } 635 } 636 EXPORT_SYMBOL_GPL(fuse_conn_put); 637 638 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) 639 { 640 refcount_inc(&fc->count); 641 return fc; 642 } 643 EXPORT_SYMBOL_GPL(fuse_conn_get); 644 645 static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) 646 { 647 struct fuse_attr attr; 648 memset(&attr, 0, sizeof(attr)); 649 650 attr.mode = mode; 651 attr.ino = FUSE_ROOT_ID; 652 attr.nlink = 1; 653 return fuse_iget(sb, 1, 0, &attr, 0, 0); 654 } 655 656 struct fuse_inode_handle { 657 u64 nodeid; 658 u32 generation; 659 }; 660 661 static struct dentry *fuse_get_dentry(struct super_block *sb, 662 struct fuse_inode_handle *handle) 663 { 664 struct fuse_conn *fc = get_fuse_conn_super(sb); 665 struct inode *inode; 666 struct dentry *entry; 667 int err = -ESTALE; 668 669 if (handle->nodeid == 0) 670 goto out_err; 671 672 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); 673 if (!inode) { 674 struct fuse_entry_out outarg; 675 const struct qstr name = QSTR_INIT(".", 1); 676 677 if (!fc->export_support) 678 goto out_err; 679 680 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, 681 &inode); 682 if (err && err != -ENOENT) 683 goto out_err; 684 if (err || !inode) { 685 err = -ESTALE; 686 goto out_err; 687 } 688 err = -EIO; 689 if (get_node_id(inode) != handle->nodeid) 690 goto out_iput; 691 } 692 err = -ESTALE; 693 if (inode->i_generation != handle->generation) 694 goto out_iput; 695 696 entry = d_obtain_alias(inode); 697 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) 698 fuse_invalidate_entry_cache(entry); 699 700 return entry; 701 702 out_iput: 703 iput(inode); 704 out_err: 705 return ERR_PTR(err); 706 } 707 708 static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, 709 struct inode *parent) 710 { 711 int len = parent ? 6 : 3; 712 u64 nodeid; 713 u32 generation; 714 715 if (*max_len < len) { 716 *max_len = len; 717 return FILEID_INVALID; 718 } 719 720 nodeid = get_fuse_inode(inode)->nodeid; 721 generation = inode->i_generation; 722 723 fh[0] = (u32)(nodeid >> 32); 724 fh[1] = (u32)(nodeid & 0xffffffff); 725 fh[2] = generation; 726 727 if (parent) { 728 nodeid = get_fuse_inode(parent)->nodeid; 729 generation = parent->i_generation; 730 731 fh[3] = (u32)(nodeid >> 32); 732 fh[4] = (u32)(nodeid & 0xffffffff); 733 fh[5] = generation; 734 } 735 736 *max_len = len; 737 return parent ? 0x82 : 0x81; 738 } 739 740 static struct dentry *fuse_fh_to_dentry(struct super_block *sb, 741 struct fid *fid, int fh_len, int fh_type) 742 { 743 struct fuse_inode_handle handle; 744 745 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) 746 return NULL; 747 748 handle.nodeid = (u64) fid->raw[0] << 32; 749 handle.nodeid |= (u64) fid->raw[1]; 750 handle.generation = fid->raw[2]; 751 return fuse_get_dentry(sb, &handle); 752 } 753 754 static struct dentry *fuse_fh_to_parent(struct super_block *sb, 755 struct fid *fid, int fh_len, int fh_type) 756 { 757 struct fuse_inode_handle parent; 758 759 if (fh_type != 0x82 || fh_len < 6) 760 return NULL; 761 762 parent.nodeid = (u64) fid->raw[3] << 32; 763 parent.nodeid |= (u64) fid->raw[4]; 764 parent.generation = fid->raw[5]; 765 return fuse_get_dentry(sb, &parent); 766 } 767 768 static struct dentry *fuse_get_parent(struct dentry *child) 769 { 770 struct inode *child_inode = d_inode(child); 771 struct fuse_conn *fc = get_fuse_conn(child_inode); 772 struct inode *inode; 773 struct dentry *parent; 774 struct fuse_entry_out outarg; 775 const struct qstr name = QSTR_INIT("..", 2); 776 int err; 777 778 if (!fc->export_support) 779 return ERR_PTR(-ESTALE); 780 781 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), 782 &name, &outarg, &inode); 783 if (err) { 784 if (err == -ENOENT) 785 return ERR_PTR(-ESTALE); 786 return ERR_PTR(err); 787 } 788 789 parent = d_obtain_alias(inode); 790 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) 791 fuse_invalidate_entry_cache(parent); 792 793 return parent; 794 } 795 796 static const struct export_operations fuse_export_operations = { 797 .fh_to_dentry = fuse_fh_to_dentry, 798 .fh_to_parent = fuse_fh_to_parent, 799 .encode_fh = fuse_encode_fh, 800 .get_parent = fuse_get_parent, 801 }; 802 803 static const struct super_operations fuse_super_operations = { 804 .alloc_inode = fuse_alloc_inode, 805 .destroy_inode = fuse_destroy_inode, 806 .evict_inode = fuse_evict_inode, 807 .write_inode = fuse_write_inode, 808 .drop_inode = generic_delete_inode, 809 .remount_fs = fuse_remount_fs, 810 .put_super = fuse_put_super, 811 .umount_begin = fuse_umount_begin, 812 .statfs = fuse_statfs, 813 .show_options = fuse_show_options, 814 }; 815 816 static void sanitize_global_limit(unsigned *limit) 817 { 818 if (*limit == 0) 819 *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / 820 sizeof(struct fuse_req); 821 822 if (*limit >= 1 << 16) 823 *limit = (1 << 16) - 1; 824 } 825 826 static int set_global_limit(const char *val, struct kernel_param *kp) 827 { 828 int rv; 829 830 rv = param_set_uint(val, kp); 831 if (rv) 832 return rv; 833 834 sanitize_global_limit((unsigned *)kp->arg); 835 836 return 0; 837 } 838 839 static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) 840 { 841 int cap_sys_admin = capable(CAP_SYS_ADMIN); 842 843 if (arg->minor < 13) 844 return; 845 846 sanitize_global_limit(&max_user_bgreq); 847 sanitize_global_limit(&max_user_congthresh); 848 849 if (arg->max_background) { 850 fc->max_background = arg->max_background; 851 852 if (!cap_sys_admin && fc->max_background > max_user_bgreq) 853 fc->max_background = max_user_bgreq; 854 } 855 if (arg->congestion_threshold) { 856 fc->congestion_threshold = arg->congestion_threshold; 857 858 if (!cap_sys_admin && 859 fc->congestion_threshold > max_user_congthresh) 860 fc->congestion_threshold = max_user_congthresh; 861 } 862 } 863 864 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 865 { 866 struct fuse_init_out *arg = &req->misc.init_out; 867 868 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) 869 fc->conn_error = 1; 870 else { 871 unsigned long ra_pages; 872 873 process_init_limits(fc, arg); 874 875 if (arg->minor >= 6) { 876 ra_pages = arg->max_readahead / PAGE_SIZE; 877 if (arg->flags & FUSE_ASYNC_READ) 878 fc->async_read = 1; 879 if (!(arg->flags & FUSE_POSIX_LOCKS)) 880 fc->no_lock = 1; 881 if (arg->minor >= 17) { 882 if (!(arg->flags & FUSE_FLOCK_LOCKS)) 883 fc->no_flock = 1; 884 } else { 885 if (!(arg->flags & FUSE_POSIX_LOCKS)) 886 fc->no_flock = 1; 887 } 888 if (arg->flags & FUSE_ATOMIC_O_TRUNC) 889 fc->atomic_o_trunc = 1; 890 if (arg->minor >= 9) { 891 /* LOOKUP has dependency on proto version */ 892 if (arg->flags & FUSE_EXPORT_SUPPORT) 893 fc->export_support = 1; 894 } 895 if (arg->flags & FUSE_BIG_WRITES) 896 fc->big_writes = 1; 897 if (arg->flags & FUSE_DONT_MASK) 898 fc->dont_mask = 1; 899 if (arg->flags & FUSE_AUTO_INVAL_DATA) 900 fc->auto_inval_data = 1; 901 if (arg->flags & FUSE_DO_READDIRPLUS) { 902 fc->do_readdirplus = 1; 903 if (arg->flags & FUSE_READDIRPLUS_AUTO) 904 fc->readdirplus_auto = 1; 905 } 906 if (arg->flags & FUSE_ASYNC_DIO) 907 fc->async_dio = 1; 908 if (arg->flags & FUSE_WRITEBACK_CACHE) 909 fc->writeback_cache = 1; 910 if (arg->flags & FUSE_PARALLEL_DIROPS) 911 fc->parallel_dirops = 1; 912 if (arg->flags & FUSE_HANDLE_KILLPRIV) 913 fc->handle_killpriv = 1; 914 if (arg->time_gran && arg->time_gran <= 1000000000) 915 fc->sb->s_time_gran = arg->time_gran; 916 if ((arg->flags & FUSE_POSIX_ACL)) { 917 fc->default_permissions = 1; 918 fc->posix_acl = 1; 919 fc->sb->s_xattr = fuse_acl_xattr_handlers; 920 } 921 } else { 922 ra_pages = fc->max_read / PAGE_SIZE; 923 fc->no_lock = 1; 924 fc->no_flock = 1; 925 } 926 927 fc->sb->s_bdi->ra_pages = 928 min(fc->sb->s_bdi->ra_pages, ra_pages); 929 fc->minor = arg->minor; 930 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; 931 fc->max_write = max_t(unsigned, 4096, fc->max_write); 932 fc->conn_init = 1; 933 } 934 fuse_set_initialized(fc); 935 wake_up_all(&fc->blocked_waitq); 936 } 937 938 static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) 939 { 940 struct fuse_init_in *arg = &req->misc.init_in; 941 942 arg->major = FUSE_KERNEL_VERSION; 943 arg->minor = FUSE_KERNEL_MINOR_VERSION; 944 arg->max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE; 945 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | 946 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | 947 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | 948 FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | 949 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | 950 FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | 951 FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL; 952 req->in.h.opcode = FUSE_INIT; 953 req->in.numargs = 1; 954 req->in.args[0].size = sizeof(*arg); 955 req->in.args[0].value = arg; 956 req->out.numargs = 1; 957 /* Variable length argument used for backward compatibility 958 with interface version < 7.5. Rest of init_out is zeroed 959 by do_get_request(), so a short reply is not a problem */ 960 req->out.argvar = 1; 961 req->out.args[0].size = sizeof(struct fuse_init_out); 962 req->out.args[0].value = &req->misc.init_out; 963 req->end = process_init_reply; 964 fuse_request_send_background(fc, req); 965 } 966 967 static void fuse_free_conn(struct fuse_conn *fc) 968 { 969 WARN_ON(!list_empty(&fc->devices)); 970 kfree_rcu(fc, rcu); 971 } 972 973 static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) 974 { 975 int err; 976 char *suffix = ""; 977 978 if (sb->s_bdev) { 979 suffix = "-fuseblk"; 980 /* 981 * sb->s_bdi points to blkdev's bdi however we want to redirect 982 * it to our private bdi... 983 */ 984 bdi_put(sb->s_bdi); 985 sb->s_bdi = &noop_backing_dev_info; 986 } 987 err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), 988 MINOR(fc->dev), suffix); 989 if (err) 990 return err; 991 992 sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE; 993 /* fuse does it's own writeback accounting */ 994 sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; 995 996 /* 997 * For a single fuse filesystem use max 1% of dirty + 998 * writeback threshold. 999 * 1000 * This gives about 1M of write buffer for memory maps on a 1001 * machine with 1G and 10% dirty_ratio, which should be more 1002 * than enough. 1003 * 1004 * Privileged users can raise it by writing to 1005 * 1006 * /sys/class/bdi/<bdi>/max_ratio 1007 */ 1008 bdi_set_max_ratio(sb->s_bdi, 1); 1009 1010 return 0; 1011 } 1012 1013 struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc) 1014 { 1015 struct fuse_dev *fud; 1016 1017 fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); 1018 if (fud) { 1019 fud->fc = fuse_conn_get(fc); 1020 fuse_pqueue_init(&fud->pq); 1021 1022 spin_lock(&fc->lock); 1023 list_add_tail(&fud->entry, &fc->devices); 1024 spin_unlock(&fc->lock); 1025 } 1026 1027 return fud; 1028 } 1029 EXPORT_SYMBOL_GPL(fuse_dev_alloc); 1030 1031 void fuse_dev_free(struct fuse_dev *fud) 1032 { 1033 struct fuse_conn *fc = fud->fc; 1034 1035 if (fc) { 1036 spin_lock(&fc->lock); 1037 list_del(&fud->entry); 1038 spin_unlock(&fc->lock); 1039 1040 fuse_conn_put(fc); 1041 } 1042 kfree(fud); 1043 } 1044 EXPORT_SYMBOL_GPL(fuse_dev_free); 1045 1046 static int fuse_fill_super(struct super_block *sb, void *data, int silent) 1047 { 1048 struct fuse_dev *fud; 1049 struct fuse_conn *fc; 1050 struct inode *root; 1051 struct fuse_mount_data d; 1052 struct file *file; 1053 struct dentry *root_dentry; 1054 struct fuse_req *init_req; 1055 int err; 1056 int is_bdev = sb->s_bdev != NULL; 1057 1058 err = -EINVAL; 1059 if (sb->s_flags & MS_MANDLOCK) 1060 goto err; 1061 1062 sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION); 1063 1064 if (!parse_fuse_opt(data, &d, is_bdev)) 1065 goto err; 1066 1067 if (is_bdev) { 1068 #ifdef CONFIG_BLOCK 1069 err = -EINVAL; 1070 if (!sb_set_blocksize(sb, d.blksize)) 1071 goto err; 1072 #endif 1073 } else { 1074 sb->s_blocksize = PAGE_SIZE; 1075 sb->s_blocksize_bits = PAGE_SHIFT; 1076 } 1077 sb->s_magic = FUSE_SUPER_MAGIC; 1078 sb->s_op = &fuse_super_operations; 1079 sb->s_xattr = fuse_xattr_handlers; 1080 sb->s_maxbytes = MAX_LFS_FILESIZE; 1081 sb->s_time_gran = 1; 1082 sb->s_export_op = &fuse_export_operations; 1083 1084 file = fget(d.fd); 1085 err = -EINVAL; 1086 if (!file) 1087 goto err; 1088 1089 if ((file->f_op != &fuse_dev_operations) || 1090 (file->f_cred->user_ns != &init_user_ns)) 1091 goto err_fput; 1092 1093 fc = kmalloc(sizeof(*fc), GFP_KERNEL); 1094 err = -ENOMEM; 1095 if (!fc) 1096 goto err_fput; 1097 1098 fuse_conn_init(fc); 1099 fc->release = fuse_free_conn; 1100 1101 fud = fuse_dev_alloc(fc); 1102 if (!fud) 1103 goto err_put_conn; 1104 1105 fc->dev = sb->s_dev; 1106 fc->sb = sb; 1107 err = fuse_bdi_init(fc, sb); 1108 if (err) 1109 goto err_dev_free; 1110 1111 /* Handle umasking inside the fuse code */ 1112 if (sb->s_flags & MS_POSIXACL) 1113 fc->dont_mask = 1; 1114 sb->s_flags |= MS_POSIXACL; 1115 1116 fc->default_permissions = d.default_permissions; 1117 fc->allow_other = d.allow_other; 1118 fc->user_id = d.user_id; 1119 fc->group_id = d.group_id; 1120 fc->max_read = max_t(unsigned, 4096, d.max_read); 1121 1122 /* Used by get_root_inode() */ 1123 sb->s_fs_info = fc; 1124 1125 err = -ENOMEM; 1126 root = fuse_get_root_inode(sb, d.rootmode); 1127 sb->s_d_op = &fuse_root_dentry_operations; 1128 root_dentry = d_make_root(root); 1129 if (!root_dentry) 1130 goto err_dev_free; 1131 /* Root dentry doesn't have .d_revalidate */ 1132 sb->s_d_op = &fuse_dentry_operations; 1133 1134 init_req = fuse_request_alloc(0); 1135 if (!init_req) 1136 goto err_put_root; 1137 __set_bit(FR_BACKGROUND, &init_req->flags); 1138 1139 if (is_bdev) { 1140 fc->destroy_req = fuse_request_alloc(0); 1141 if (!fc->destroy_req) 1142 goto err_free_init_req; 1143 } 1144 1145 mutex_lock(&fuse_mutex); 1146 err = -EINVAL; 1147 if (file->private_data) 1148 goto err_unlock; 1149 1150 err = fuse_ctl_add_conn(fc); 1151 if (err) 1152 goto err_unlock; 1153 1154 list_add_tail(&fc->entry, &fuse_conn_list); 1155 sb->s_root = root_dentry; 1156 file->private_data = fud; 1157 mutex_unlock(&fuse_mutex); 1158 /* 1159 * atomic_dec_and_test() in fput() provides the necessary 1160 * memory barrier for file->private_data to be visible on all 1161 * CPUs after this 1162 */ 1163 fput(file); 1164 1165 fuse_send_init(fc, init_req); 1166 1167 return 0; 1168 1169 err_unlock: 1170 mutex_unlock(&fuse_mutex); 1171 err_free_init_req: 1172 fuse_request_free(init_req); 1173 err_put_root: 1174 dput(root_dentry); 1175 err_dev_free: 1176 fuse_dev_free(fud); 1177 err_put_conn: 1178 fuse_conn_put(fc); 1179 err_fput: 1180 fput(file); 1181 err: 1182 return err; 1183 } 1184 1185 static struct dentry *fuse_mount(struct file_system_type *fs_type, 1186 int flags, const char *dev_name, 1187 void *raw_data) 1188 { 1189 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); 1190 } 1191 1192 static void fuse_kill_sb_anon(struct super_block *sb) 1193 { 1194 struct fuse_conn *fc = get_fuse_conn_super(sb); 1195 1196 if (fc) { 1197 down_write(&fc->killsb); 1198 fc->sb = NULL; 1199 up_write(&fc->killsb); 1200 } 1201 1202 kill_anon_super(sb); 1203 } 1204 1205 static struct file_system_type fuse_fs_type = { 1206 .owner = THIS_MODULE, 1207 .name = "fuse", 1208 .fs_flags = FS_HAS_SUBTYPE, 1209 .mount = fuse_mount, 1210 .kill_sb = fuse_kill_sb_anon, 1211 }; 1212 MODULE_ALIAS_FS("fuse"); 1213 1214 #ifdef CONFIG_BLOCK 1215 static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, 1216 int flags, const char *dev_name, 1217 void *raw_data) 1218 { 1219 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); 1220 } 1221 1222 static void fuse_kill_sb_blk(struct super_block *sb) 1223 { 1224 struct fuse_conn *fc = get_fuse_conn_super(sb); 1225 1226 if (fc) { 1227 down_write(&fc->killsb); 1228 fc->sb = NULL; 1229 up_write(&fc->killsb); 1230 } 1231 1232 kill_block_super(sb); 1233 } 1234 1235 static struct file_system_type fuseblk_fs_type = { 1236 .owner = THIS_MODULE, 1237 .name = "fuseblk", 1238 .mount = fuse_mount_blk, 1239 .kill_sb = fuse_kill_sb_blk, 1240 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, 1241 }; 1242 MODULE_ALIAS_FS("fuseblk"); 1243 1244 static inline int register_fuseblk(void) 1245 { 1246 return register_filesystem(&fuseblk_fs_type); 1247 } 1248 1249 static inline void unregister_fuseblk(void) 1250 { 1251 unregister_filesystem(&fuseblk_fs_type); 1252 } 1253 #else 1254 static inline int register_fuseblk(void) 1255 { 1256 return 0; 1257 } 1258 1259 static inline void unregister_fuseblk(void) 1260 { 1261 } 1262 #endif 1263 1264 static void fuse_inode_init_once(void *foo) 1265 { 1266 struct inode *inode = foo; 1267 1268 inode_init_once(inode); 1269 } 1270 1271 static int __init fuse_fs_init(void) 1272 { 1273 int err; 1274 1275 fuse_inode_cachep = kmem_cache_create("fuse_inode", 1276 sizeof(struct fuse_inode), 0, 1277 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, 1278 fuse_inode_init_once); 1279 err = -ENOMEM; 1280 if (!fuse_inode_cachep) 1281 goto out; 1282 1283 err = register_fuseblk(); 1284 if (err) 1285 goto out2; 1286 1287 err = register_filesystem(&fuse_fs_type); 1288 if (err) 1289 goto out3; 1290 1291 return 0; 1292 1293 out3: 1294 unregister_fuseblk(); 1295 out2: 1296 kmem_cache_destroy(fuse_inode_cachep); 1297 out: 1298 return err; 1299 } 1300 1301 static void fuse_fs_cleanup(void) 1302 { 1303 unregister_filesystem(&fuse_fs_type); 1304 unregister_fuseblk(); 1305 1306 /* 1307 * Make sure all delayed rcu free inodes are flushed before we 1308 * destroy cache. 1309 */ 1310 rcu_barrier(); 1311 kmem_cache_destroy(fuse_inode_cachep); 1312 } 1313 1314 static struct kobject *fuse_kobj; 1315 1316 static int fuse_sysfs_init(void) 1317 { 1318 int err; 1319 1320 fuse_kobj = kobject_create_and_add("fuse", fs_kobj); 1321 if (!fuse_kobj) { 1322 err = -ENOMEM; 1323 goto out_err; 1324 } 1325 1326 err = sysfs_create_mount_point(fuse_kobj, "connections"); 1327 if (err) 1328 goto out_fuse_unregister; 1329 1330 return 0; 1331 1332 out_fuse_unregister: 1333 kobject_put(fuse_kobj); 1334 out_err: 1335 return err; 1336 } 1337 1338 static void fuse_sysfs_cleanup(void) 1339 { 1340 sysfs_remove_mount_point(fuse_kobj, "connections"); 1341 kobject_put(fuse_kobj); 1342 } 1343 1344 static int __init fuse_init(void) 1345 { 1346 int res; 1347 1348 printk(KERN_INFO "fuse init (API version %i.%i)\n", 1349 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); 1350 1351 INIT_LIST_HEAD(&fuse_conn_list); 1352 res = fuse_fs_init(); 1353 if (res) 1354 goto err; 1355 1356 res = fuse_dev_init(); 1357 if (res) 1358 goto err_fs_cleanup; 1359 1360 res = fuse_sysfs_init(); 1361 if (res) 1362 goto err_dev_cleanup; 1363 1364 res = fuse_ctl_init(); 1365 if (res) 1366 goto err_sysfs_cleanup; 1367 1368 sanitize_global_limit(&max_user_bgreq); 1369 sanitize_global_limit(&max_user_congthresh); 1370 1371 return 0; 1372 1373 err_sysfs_cleanup: 1374 fuse_sysfs_cleanup(); 1375 err_dev_cleanup: 1376 fuse_dev_cleanup(); 1377 err_fs_cleanup: 1378 fuse_fs_cleanup(); 1379 err: 1380 return res; 1381 } 1382 1383 static void __exit fuse_exit(void) 1384 { 1385 printk(KERN_DEBUG "fuse exit\n"); 1386 1387 fuse_ctl_cleanup(); 1388 fuse_sysfs_cleanup(); 1389 fuse_fs_cleanup(); 1390 fuse_dev_cleanup(); 1391 } 1392 1393 module_init(fuse_init); 1394 module_exit(fuse_exit); 1395