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 25 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); 26 MODULE_DESCRIPTION("Filesystem in Userspace"); 27 MODULE_LICENSE("GPL"); 28 29 static struct kmem_cache *fuse_inode_cachep; 30 struct list_head fuse_conn_list; 31 DEFINE_MUTEX(fuse_mutex); 32 33 static int set_global_limit(const char *val, struct kernel_param *kp); 34 35 unsigned max_user_bgreq; 36 module_param_call(max_user_bgreq, set_global_limit, param_get_uint, 37 &max_user_bgreq, 0644); 38 __MODULE_PARM_TYPE(max_user_bgreq, "uint"); 39 MODULE_PARM_DESC(max_user_bgreq, 40 "Global limit for the maximum number of backgrounded requests an " 41 "unprivileged user can set"); 42 43 unsigned max_user_congthresh; 44 module_param_call(max_user_congthresh, set_global_limit, param_get_uint, 45 &max_user_congthresh, 0644); 46 __MODULE_PARM_TYPE(max_user_congthresh, "uint"); 47 MODULE_PARM_DESC(max_user_congthresh, 48 "Global limit for the maximum congestion threshold an " 49 "unprivileged user can set"); 50 51 #define FUSE_SUPER_MAGIC 0x65735546 52 53 #define FUSE_DEFAULT_BLKSIZE 512 54 55 /** Maximum number of outstanding background requests */ 56 #define FUSE_DEFAULT_MAX_BACKGROUND 12 57 58 /** Congestion starts at 75% of maximum */ 59 #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4) 60 61 struct fuse_mount_data { 62 int fd; 63 unsigned rootmode; 64 kuid_t user_id; 65 kgid_t group_id; 66 unsigned fd_present:1; 67 unsigned rootmode_present:1; 68 unsigned user_id_present:1; 69 unsigned group_id_present:1; 70 unsigned default_permissions:1; 71 unsigned allow_other:1; 72 unsigned max_read; 73 unsigned blksize; 74 }; 75 76 struct fuse_forget_link *fuse_alloc_forget(void) 77 { 78 return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL); 79 } 80 81 static struct inode *fuse_alloc_inode(struct super_block *sb) 82 { 83 struct inode *inode; 84 struct fuse_inode *fi; 85 86 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); 87 if (!inode) 88 return NULL; 89 90 fi = get_fuse_inode(inode); 91 fi->i_time = 0; 92 fi->nodeid = 0; 93 fi->nlookup = 0; 94 fi->attr_version = 0; 95 fi->writectr = 0; 96 fi->orig_ino = 0; 97 fi->state = 0; 98 INIT_LIST_HEAD(&fi->write_files); 99 INIT_LIST_HEAD(&fi->queued_writes); 100 INIT_LIST_HEAD(&fi->writepages); 101 init_waitqueue_head(&fi->page_waitq); 102 mutex_init(&fi->mutex); 103 fi->forget = fuse_alloc_forget(); 104 if (!fi->forget) { 105 kmem_cache_free(fuse_inode_cachep, inode); 106 return NULL; 107 } 108 109 return inode; 110 } 111 112 static void fuse_i_callback(struct rcu_head *head) 113 { 114 struct inode *inode = container_of(head, struct inode, i_rcu); 115 kmem_cache_free(fuse_inode_cachep, inode); 116 } 117 118 static void fuse_destroy_inode(struct inode *inode) 119 { 120 struct fuse_inode *fi = get_fuse_inode(inode); 121 BUG_ON(!list_empty(&fi->write_files)); 122 BUG_ON(!list_empty(&fi->queued_writes)); 123 mutex_destroy(&fi->mutex); 124 kfree(fi->forget); 125 call_rcu(&inode->i_rcu, fuse_i_callback); 126 } 127 128 static void fuse_evict_inode(struct inode *inode) 129 { 130 truncate_inode_pages_final(&inode->i_data); 131 clear_inode(inode); 132 if (inode->i_sb->s_flags & MS_ACTIVE) { 133 struct fuse_conn *fc = get_fuse_conn(inode); 134 struct fuse_inode *fi = get_fuse_inode(inode); 135 fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup); 136 fi->forget = NULL; 137 } 138 } 139 140 static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) 141 { 142 sync_filesystem(sb); 143 if (*flags & MS_MANDLOCK) 144 return -EINVAL; 145 146 return 0; 147 } 148 149 /* 150 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down 151 * so that it will fit. 152 */ 153 static ino_t fuse_squash_ino(u64 ino64) 154 { 155 ino_t ino = (ino_t) ino64; 156 if (sizeof(ino_t) < sizeof(u64)) 157 ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; 158 return ino; 159 } 160 161 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, 162 u64 attr_valid) 163 { 164 struct fuse_conn *fc = get_fuse_conn(inode); 165 struct fuse_inode *fi = get_fuse_inode(inode); 166 167 fi->attr_version = ++fc->attr_version; 168 fi->i_time = attr_valid; 169 170 inode->i_ino = fuse_squash_ino(attr->ino); 171 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); 172 set_nlink(inode, attr->nlink); 173 inode->i_uid = make_kuid(&init_user_ns, attr->uid); 174 inode->i_gid = make_kgid(&init_user_ns, attr->gid); 175 inode->i_blocks = attr->blocks; 176 inode->i_atime.tv_sec = attr->atime; 177 inode->i_atime.tv_nsec = attr->atimensec; 178 /* mtime from server may be stale due to local buffered write */ 179 if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) { 180 inode->i_mtime.tv_sec = attr->mtime; 181 inode->i_mtime.tv_nsec = attr->mtimensec; 182 inode->i_ctime.tv_sec = attr->ctime; 183 inode->i_ctime.tv_nsec = attr->ctimensec; 184 } 185 186 if (attr->blksize != 0) 187 inode->i_blkbits = ilog2(attr->blksize); 188 else 189 inode->i_blkbits = inode->i_sb->s_blocksize_bits; 190 191 /* 192 * Don't set the sticky bit in i_mode, unless we want the VFS 193 * to check permissions. This prevents failures due to the 194 * check in may_delete(). 195 */ 196 fi->orig_i_mode = inode->i_mode; 197 if (!fc->default_permissions) 198 inode->i_mode &= ~S_ISVTX; 199 200 fi->orig_ino = attr->ino; 201 } 202 203 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, 204 u64 attr_valid, u64 attr_version) 205 { 206 struct fuse_conn *fc = get_fuse_conn(inode); 207 struct fuse_inode *fi = get_fuse_inode(inode); 208 bool is_wb = fc->writeback_cache; 209 loff_t oldsize; 210 struct timespec old_mtime; 211 212 spin_lock(&fc->lock); 213 if ((attr_version != 0 && fi->attr_version > attr_version) || 214 test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { 215 spin_unlock(&fc->lock); 216 return; 217 } 218 219 old_mtime = inode->i_mtime; 220 fuse_change_attributes_common(inode, attr, attr_valid); 221 222 oldsize = inode->i_size; 223 /* 224 * In case of writeback_cache enabled, the cached writes beyond EOF 225 * extend local i_size without keeping userspace server in sync. So, 226 * attr->size coming from server can be stale. We cannot trust it. 227 */ 228 if (!is_wb || !S_ISREG(inode->i_mode)) 229 i_size_write(inode, attr->size); 230 spin_unlock(&fc->lock); 231 232 if (!is_wb && S_ISREG(inode->i_mode)) { 233 bool inval = false; 234 235 if (oldsize != attr->size) { 236 truncate_pagecache(inode, attr->size); 237 inval = true; 238 } else if (fc->auto_inval_data) { 239 struct timespec new_mtime = { 240 .tv_sec = attr->mtime, 241 .tv_nsec = attr->mtimensec, 242 }; 243 244 /* 245 * Auto inval mode also checks and invalidates if mtime 246 * has changed. 247 */ 248 if (!timespec_equal(&old_mtime, &new_mtime)) 249 inval = true; 250 } 251 252 if (inval) 253 invalidate_inode_pages2(inode->i_mapping); 254 } 255 } 256 257 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) 258 { 259 inode->i_mode = attr->mode & S_IFMT; 260 inode->i_size = attr->size; 261 inode->i_mtime.tv_sec = attr->mtime; 262 inode->i_mtime.tv_nsec = attr->mtimensec; 263 inode->i_ctime.tv_sec = attr->ctime; 264 inode->i_ctime.tv_nsec = attr->ctimensec; 265 if (S_ISREG(inode->i_mode)) { 266 fuse_init_common(inode); 267 fuse_init_file_inode(inode); 268 } else if (S_ISDIR(inode->i_mode)) 269 fuse_init_dir(inode); 270 else if (S_ISLNK(inode->i_mode)) 271 fuse_init_symlink(inode); 272 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || 273 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { 274 fuse_init_common(inode); 275 init_special_inode(inode, inode->i_mode, 276 new_decode_dev(attr->rdev)); 277 } else 278 BUG(); 279 } 280 281 int fuse_inode_eq(struct inode *inode, void *_nodeidp) 282 { 283 u64 nodeid = *(u64 *) _nodeidp; 284 if (get_node_id(inode) == nodeid) 285 return 1; 286 else 287 return 0; 288 } 289 290 static int fuse_inode_set(struct inode *inode, void *_nodeidp) 291 { 292 u64 nodeid = *(u64 *) _nodeidp; 293 get_fuse_inode(inode)->nodeid = nodeid; 294 return 0; 295 } 296 297 struct inode *fuse_iget(struct super_block *sb, u64 nodeid, 298 int generation, struct fuse_attr *attr, 299 u64 attr_valid, u64 attr_version) 300 { 301 struct inode *inode; 302 struct fuse_inode *fi; 303 struct fuse_conn *fc = get_fuse_conn_super(sb); 304 305 retry: 306 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); 307 if (!inode) 308 return NULL; 309 310 if ((inode->i_state & I_NEW)) { 311 inode->i_flags |= S_NOATIME; 312 if (!fc->writeback_cache || !S_ISREG(attr->mode)) 313 inode->i_flags |= S_NOCMTIME; 314 inode->i_generation = generation; 315 fuse_init_inode(inode, attr); 316 unlock_new_inode(inode); 317 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { 318 /* Inode has changed type, any I/O on the old should fail */ 319 make_bad_inode(inode); 320 iput(inode); 321 goto retry; 322 } 323 324 fi = get_fuse_inode(inode); 325 spin_lock(&fc->lock); 326 fi->nlookup++; 327 spin_unlock(&fc->lock); 328 fuse_change_attributes(inode, attr, attr_valid, attr_version); 329 330 return inode; 331 } 332 333 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, 334 loff_t offset, loff_t len) 335 { 336 struct inode *inode; 337 pgoff_t pg_start; 338 pgoff_t pg_end; 339 340 inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid); 341 if (!inode) 342 return -ENOENT; 343 344 fuse_invalidate_attr(inode); 345 forget_all_cached_acls(inode); 346 if (offset >= 0) { 347 pg_start = offset >> PAGE_SHIFT; 348 if (len <= 0) 349 pg_end = -1; 350 else 351 pg_end = (offset + len - 1) >> PAGE_SHIFT; 352 invalidate_inode_pages2_range(inode->i_mapping, 353 pg_start, pg_end); 354 } 355 iput(inode); 356 return 0; 357 } 358 359 void fuse_lock_inode(struct inode *inode) 360 { 361 if (!get_fuse_conn(inode)->parallel_dirops) 362 mutex_lock(&get_fuse_inode(inode)->mutex); 363 } 364 365 void fuse_unlock_inode(struct inode *inode) 366 { 367 if (!get_fuse_conn(inode)->parallel_dirops) 368 mutex_unlock(&get_fuse_inode(inode)->mutex); 369 } 370 371 static void fuse_umount_begin(struct super_block *sb) 372 { 373 fuse_abort_conn(get_fuse_conn_super(sb)); 374 } 375 376 static void fuse_send_destroy(struct fuse_conn *fc) 377 { 378 struct fuse_req *req = fc->destroy_req; 379 if (req && fc->conn_init) { 380 fc->destroy_req = NULL; 381 req->in.h.opcode = FUSE_DESTROY; 382 __set_bit(FR_FORCE, &req->flags); 383 __clear_bit(FR_BACKGROUND, &req->flags); 384 fuse_request_send(fc, req); 385 fuse_put_request(fc, req); 386 } 387 } 388 389 static void fuse_bdi_destroy(struct fuse_conn *fc) 390 { 391 if (fc->bdi_initialized) 392 bdi_destroy(&fc->bdi); 393 } 394 395 static void fuse_put_super(struct super_block *sb) 396 { 397 struct fuse_conn *fc = get_fuse_conn_super(sb); 398 399 fuse_send_destroy(fc); 400 401 fuse_abort_conn(fc); 402 mutex_lock(&fuse_mutex); 403 list_del(&fc->entry); 404 fuse_ctl_remove_conn(fc); 405 mutex_unlock(&fuse_mutex); 406 fuse_bdi_destroy(fc); 407 408 fuse_conn_put(fc); 409 } 410 411 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) 412 { 413 stbuf->f_type = FUSE_SUPER_MAGIC; 414 stbuf->f_bsize = attr->bsize; 415 stbuf->f_frsize = attr->frsize; 416 stbuf->f_blocks = attr->blocks; 417 stbuf->f_bfree = attr->bfree; 418 stbuf->f_bavail = attr->bavail; 419 stbuf->f_files = attr->files; 420 stbuf->f_ffree = attr->ffree; 421 stbuf->f_namelen = attr->namelen; 422 /* fsid is left zero */ 423 } 424 425 static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) 426 { 427 struct super_block *sb = dentry->d_sb; 428 struct fuse_conn *fc = get_fuse_conn_super(sb); 429 FUSE_ARGS(args); 430 struct fuse_statfs_out outarg; 431 int err; 432 433 if (!fuse_allow_current_process(fc)) { 434 buf->f_type = FUSE_SUPER_MAGIC; 435 return 0; 436 } 437 438 memset(&outarg, 0, sizeof(outarg)); 439 args.in.numargs = 0; 440 args.in.h.opcode = FUSE_STATFS; 441 args.in.h.nodeid = get_node_id(d_inode(dentry)); 442 args.out.numargs = 1; 443 args.out.args[0].size = sizeof(outarg); 444 args.out.args[0].value = &outarg; 445 err = fuse_simple_request(fc, &args); 446 if (!err) 447 convert_fuse_statfs(buf, &outarg.st); 448 return err; 449 } 450 451 enum { 452 OPT_FD, 453 OPT_ROOTMODE, 454 OPT_USER_ID, 455 OPT_GROUP_ID, 456 OPT_DEFAULT_PERMISSIONS, 457 OPT_ALLOW_OTHER, 458 OPT_MAX_READ, 459 OPT_BLKSIZE, 460 OPT_ERR 461 }; 462 463 static const match_table_t tokens = { 464 {OPT_FD, "fd=%u"}, 465 {OPT_ROOTMODE, "rootmode=%o"}, 466 {OPT_USER_ID, "user_id=%u"}, 467 {OPT_GROUP_ID, "group_id=%u"}, 468 {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, 469 {OPT_ALLOW_OTHER, "allow_other"}, 470 {OPT_MAX_READ, "max_read=%u"}, 471 {OPT_BLKSIZE, "blksize=%u"}, 472 {OPT_ERR, NULL} 473 }; 474 475 static int fuse_match_uint(substring_t *s, unsigned int *res) 476 { 477 int err = -ENOMEM; 478 char *buf = match_strdup(s); 479 if (buf) { 480 err = kstrtouint(buf, 10, res); 481 kfree(buf); 482 } 483 return err; 484 } 485 486 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) 487 { 488 char *p; 489 memset(d, 0, sizeof(struct fuse_mount_data)); 490 d->max_read = ~0; 491 d->blksize = FUSE_DEFAULT_BLKSIZE; 492 493 while ((p = strsep(&opt, ",")) != NULL) { 494 int token; 495 int value; 496 unsigned uv; 497 substring_t args[MAX_OPT_ARGS]; 498 if (!*p) 499 continue; 500 501 token = match_token(p, tokens, args); 502 switch (token) { 503 case OPT_FD: 504 if (match_int(&args[0], &value)) 505 return 0; 506 d->fd = value; 507 d->fd_present = 1; 508 break; 509 510 case OPT_ROOTMODE: 511 if (match_octal(&args[0], &value)) 512 return 0; 513 if (!fuse_valid_type(value)) 514 return 0; 515 d->rootmode = value; 516 d->rootmode_present = 1; 517 break; 518 519 case OPT_USER_ID: 520 if (fuse_match_uint(&args[0], &uv)) 521 return 0; 522 d->user_id = make_kuid(current_user_ns(), uv); 523 if (!uid_valid(d->user_id)) 524 return 0; 525 d->user_id_present = 1; 526 break; 527 528 case OPT_GROUP_ID: 529 if (fuse_match_uint(&args[0], &uv)) 530 return 0; 531 d->group_id = make_kgid(current_user_ns(), uv); 532 if (!gid_valid(d->group_id)) 533 return 0; 534 d->group_id_present = 1; 535 break; 536 537 case OPT_DEFAULT_PERMISSIONS: 538 d->default_permissions = 1; 539 break; 540 541 case OPT_ALLOW_OTHER: 542 d->allow_other = 1; 543 break; 544 545 case OPT_MAX_READ: 546 if (match_int(&args[0], &value)) 547 return 0; 548 d->max_read = value; 549 break; 550 551 case OPT_BLKSIZE: 552 if (!is_bdev || match_int(&args[0], &value)) 553 return 0; 554 d->blksize = value; 555 break; 556 557 default: 558 return 0; 559 } 560 } 561 562 if (!d->fd_present || !d->rootmode_present || 563 !d->user_id_present || !d->group_id_present) 564 return 0; 565 566 return 1; 567 } 568 569 static int fuse_show_options(struct seq_file *m, struct dentry *root) 570 { 571 struct super_block *sb = root->d_sb; 572 struct fuse_conn *fc = get_fuse_conn_super(sb); 573 574 seq_printf(m, ",user_id=%u", from_kuid_munged(&init_user_ns, fc->user_id)); 575 seq_printf(m, ",group_id=%u", from_kgid_munged(&init_user_ns, fc->group_id)); 576 if (fc->default_permissions) 577 seq_puts(m, ",default_permissions"); 578 if (fc->allow_other) 579 seq_puts(m, ",allow_other"); 580 if (fc->max_read != ~0) 581 seq_printf(m, ",max_read=%u", fc->max_read); 582 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) 583 seq_printf(m, ",blksize=%lu", sb->s_blocksize); 584 return 0; 585 } 586 587 static void fuse_iqueue_init(struct fuse_iqueue *fiq) 588 { 589 memset(fiq, 0, sizeof(struct fuse_iqueue)); 590 init_waitqueue_head(&fiq->waitq); 591 INIT_LIST_HEAD(&fiq->pending); 592 INIT_LIST_HEAD(&fiq->interrupts); 593 fiq->forget_list_tail = &fiq->forget_list_head; 594 fiq->connected = 1; 595 } 596 597 static void fuse_pqueue_init(struct fuse_pqueue *fpq) 598 { 599 memset(fpq, 0, sizeof(struct fuse_pqueue)); 600 spin_lock_init(&fpq->lock); 601 INIT_LIST_HEAD(&fpq->processing); 602 INIT_LIST_HEAD(&fpq->io); 603 fpq->connected = 1; 604 } 605 606 void fuse_conn_init(struct fuse_conn *fc) 607 { 608 memset(fc, 0, sizeof(*fc)); 609 spin_lock_init(&fc->lock); 610 init_rwsem(&fc->killsb); 611 atomic_set(&fc->count, 1); 612 atomic_set(&fc->dev_count, 1); 613 init_waitqueue_head(&fc->blocked_waitq); 614 init_waitqueue_head(&fc->reserved_req_waitq); 615 fuse_iqueue_init(&fc->iq); 616 INIT_LIST_HEAD(&fc->bg_queue); 617 INIT_LIST_HEAD(&fc->entry); 618 INIT_LIST_HEAD(&fc->devices); 619 atomic_set(&fc->num_waiting, 0); 620 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; 621 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; 622 fc->khctr = 0; 623 fc->polled_files = RB_ROOT; 624 fc->blocked = 0; 625 fc->initialized = 0; 626 fc->connected = 1; 627 fc->attr_version = 1; 628 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); 629 } 630 EXPORT_SYMBOL_GPL(fuse_conn_init); 631 632 void fuse_conn_put(struct fuse_conn *fc) 633 { 634 if (atomic_dec_and_test(&fc->count)) { 635 if (fc->destroy_req) 636 fuse_request_free(fc->destroy_req); 637 fc->release(fc); 638 } 639 } 640 EXPORT_SYMBOL_GPL(fuse_conn_put); 641 642 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) 643 { 644 atomic_inc(&fc->count); 645 return fc; 646 } 647 EXPORT_SYMBOL_GPL(fuse_conn_get); 648 649 static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) 650 { 651 struct fuse_attr attr; 652 memset(&attr, 0, sizeof(attr)); 653 654 attr.mode = mode; 655 attr.ino = FUSE_ROOT_ID; 656 attr.nlink = 1; 657 return fuse_iget(sb, 1, 0, &attr, 0, 0); 658 } 659 660 struct fuse_inode_handle { 661 u64 nodeid; 662 u32 generation; 663 }; 664 665 static struct dentry *fuse_get_dentry(struct super_block *sb, 666 struct fuse_inode_handle *handle) 667 { 668 struct fuse_conn *fc = get_fuse_conn_super(sb); 669 struct inode *inode; 670 struct dentry *entry; 671 int err = -ESTALE; 672 673 if (handle->nodeid == 0) 674 goto out_err; 675 676 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); 677 if (!inode) { 678 struct fuse_entry_out outarg; 679 const struct qstr name = QSTR_INIT(".", 1); 680 681 if (!fc->export_support) 682 goto out_err; 683 684 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, 685 &inode); 686 if (err && err != -ENOENT) 687 goto out_err; 688 if (err || !inode) { 689 err = -ESTALE; 690 goto out_err; 691 } 692 err = -EIO; 693 if (get_node_id(inode) != handle->nodeid) 694 goto out_iput; 695 } 696 err = -ESTALE; 697 if (inode->i_generation != handle->generation) 698 goto out_iput; 699 700 entry = d_obtain_alias(inode); 701 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) 702 fuse_invalidate_entry_cache(entry); 703 704 return entry; 705 706 out_iput: 707 iput(inode); 708 out_err: 709 return ERR_PTR(err); 710 } 711 712 static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, 713 struct inode *parent) 714 { 715 int len = parent ? 6 : 3; 716 u64 nodeid; 717 u32 generation; 718 719 if (*max_len < len) { 720 *max_len = len; 721 return FILEID_INVALID; 722 } 723 724 nodeid = get_fuse_inode(inode)->nodeid; 725 generation = inode->i_generation; 726 727 fh[0] = (u32)(nodeid >> 32); 728 fh[1] = (u32)(nodeid & 0xffffffff); 729 fh[2] = generation; 730 731 if (parent) { 732 nodeid = get_fuse_inode(parent)->nodeid; 733 generation = parent->i_generation; 734 735 fh[3] = (u32)(nodeid >> 32); 736 fh[4] = (u32)(nodeid & 0xffffffff); 737 fh[5] = generation; 738 } 739 740 *max_len = len; 741 return parent ? 0x82 : 0x81; 742 } 743 744 static struct dentry *fuse_fh_to_dentry(struct super_block *sb, 745 struct fid *fid, int fh_len, int fh_type) 746 { 747 struct fuse_inode_handle handle; 748 749 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) 750 return NULL; 751 752 handle.nodeid = (u64) fid->raw[0] << 32; 753 handle.nodeid |= (u64) fid->raw[1]; 754 handle.generation = fid->raw[2]; 755 return fuse_get_dentry(sb, &handle); 756 } 757 758 static struct dentry *fuse_fh_to_parent(struct super_block *sb, 759 struct fid *fid, int fh_len, int fh_type) 760 { 761 struct fuse_inode_handle parent; 762 763 if (fh_type != 0x82 || fh_len < 6) 764 return NULL; 765 766 parent.nodeid = (u64) fid->raw[3] << 32; 767 parent.nodeid |= (u64) fid->raw[4]; 768 parent.generation = fid->raw[5]; 769 return fuse_get_dentry(sb, &parent); 770 } 771 772 static struct dentry *fuse_get_parent(struct dentry *child) 773 { 774 struct inode *child_inode = d_inode(child); 775 struct fuse_conn *fc = get_fuse_conn(child_inode); 776 struct inode *inode; 777 struct dentry *parent; 778 struct fuse_entry_out outarg; 779 const struct qstr name = QSTR_INIT("..", 2); 780 int err; 781 782 if (!fc->export_support) 783 return ERR_PTR(-ESTALE); 784 785 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), 786 &name, &outarg, &inode); 787 if (err) { 788 if (err == -ENOENT) 789 return ERR_PTR(-ESTALE); 790 return ERR_PTR(err); 791 } 792 793 parent = d_obtain_alias(inode); 794 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) 795 fuse_invalidate_entry_cache(parent); 796 797 return parent; 798 } 799 800 static const struct export_operations fuse_export_operations = { 801 .fh_to_dentry = fuse_fh_to_dentry, 802 .fh_to_parent = fuse_fh_to_parent, 803 .encode_fh = fuse_encode_fh, 804 .get_parent = fuse_get_parent, 805 }; 806 807 static const struct super_operations fuse_super_operations = { 808 .alloc_inode = fuse_alloc_inode, 809 .destroy_inode = fuse_destroy_inode, 810 .evict_inode = fuse_evict_inode, 811 .write_inode = fuse_write_inode, 812 .drop_inode = generic_delete_inode, 813 .remount_fs = fuse_remount_fs, 814 .put_super = fuse_put_super, 815 .umount_begin = fuse_umount_begin, 816 .statfs = fuse_statfs, 817 .show_options = fuse_show_options, 818 }; 819 820 static void sanitize_global_limit(unsigned *limit) 821 { 822 if (*limit == 0) 823 *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / 824 sizeof(struct fuse_req); 825 826 if (*limit >= 1 << 16) 827 *limit = (1 << 16) - 1; 828 } 829 830 static int set_global_limit(const char *val, struct kernel_param *kp) 831 { 832 int rv; 833 834 rv = param_set_uint(val, kp); 835 if (rv) 836 return rv; 837 838 sanitize_global_limit((unsigned *)kp->arg); 839 840 return 0; 841 } 842 843 static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) 844 { 845 int cap_sys_admin = capable(CAP_SYS_ADMIN); 846 847 if (arg->minor < 13) 848 return; 849 850 sanitize_global_limit(&max_user_bgreq); 851 sanitize_global_limit(&max_user_congthresh); 852 853 if (arg->max_background) { 854 fc->max_background = arg->max_background; 855 856 if (!cap_sys_admin && fc->max_background > max_user_bgreq) 857 fc->max_background = max_user_bgreq; 858 } 859 if (arg->congestion_threshold) { 860 fc->congestion_threshold = arg->congestion_threshold; 861 862 if (!cap_sys_admin && 863 fc->congestion_threshold > max_user_congthresh) 864 fc->congestion_threshold = max_user_congthresh; 865 } 866 } 867 868 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 869 { 870 struct fuse_init_out *arg = &req->misc.init_out; 871 872 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) 873 fc->conn_error = 1; 874 else { 875 unsigned long ra_pages; 876 877 process_init_limits(fc, arg); 878 879 if (arg->minor >= 6) { 880 ra_pages = arg->max_readahead / PAGE_SIZE; 881 if (arg->flags & FUSE_ASYNC_READ) 882 fc->async_read = 1; 883 if (!(arg->flags & FUSE_POSIX_LOCKS)) 884 fc->no_lock = 1; 885 if (arg->minor >= 17) { 886 if (!(arg->flags & FUSE_FLOCK_LOCKS)) 887 fc->no_flock = 1; 888 } else { 889 if (!(arg->flags & FUSE_POSIX_LOCKS)) 890 fc->no_flock = 1; 891 } 892 if (arg->flags & FUSE_ATOMIC_O_TRUNC) 893 fc->atomic_o_trunc = 1; 894 if (arg->minor >= 9) { 895 /* LOOKUP has dependency on proto version */ 896 if (arg->flags & FUSE_EXPORT_SUPPORT) 897 fc->export_support = 1; 898 } 899 if (arg->flags & FUSE_BIG_WRITES) 900 fc->big_writes = 1; 901 if (arg->flags & FUSE_DONT_MASK) 902 fc->dont_mask = 1; 903 if (arg->flags & FUSE_AUTO_INVAL_DATA) 904 fc->auto_inval_data = 1; 905 if (arg->flags & FUSE_DO_READDIRPLUS) { 906 fc->do_readdirplus = 1; 907 if (arg->flags & FUSE_READDIRPLUS_AUTO) 908 fc->readdirplus_auto = 1; 909 } 910 if (arg->flags & FUSE_ASYNC_DIO) 911 fc->async_dio = 1; 912 if (arg->flags & FUSE_WRITEBACK_CACHE) 913 fc->writeback_cache = 1; 914 if (arg->flags & FUSE_PARALLEL_DIROPS) 915 fc->parallel_dirops = 1; 916 if (arg->flags & FUSE_HANDLE_KILLPRIV) 917 fc->handle_killpriv = 1; 918 if (arg->time_gran && arg->time_gran <= 1000000000) 919 fc->sb->s_time_gran = arg->time_gran; 920 if ((arg->flags & FUSE_POSIX_ACL)) { 921 fc->default_permissions = 1; 922 fc->posix_acl = 1; 923 fc->sb->s_xattr = fuse_acl_xattr_handlers; 924 } 925 } else { 926 ra_pages = fc->max_read / PAGE_SIZE; 927 fc->no_lock = 1; 928 fc->no_flock = 1; 929 } 930 931 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); 932 fc->minor = arg->minor; 933 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; 934 fc->max_write = max_t(unsigned, 4096, fc->max_write); 935 fc->conn_init = 1; 936 } 937 fuse_set_initialized(fc); 938 wake_up_all(&fc->blocked_waitq); 939 } 940 941 static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) 942 { 943 struct fuse_init_in *arg = &req->misc.init_in; 944 945 arg->major = FUSE_KERNEL_VERSION; 946 arg->minor = FUSE_KERNEL_MINOR_VERSION; 947 arg->max_readahead = fc->bdi.ra_pages * PAGE_SIZE; 948 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | 949 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | 950 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | 951 FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | 952 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | 953 FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | 954 FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL; 955 req->in.h.opcode = FUSE_INIT; 956 req->in.numargs = 1; 957 req->in.args[0].size = sizeof(*arg); 958 req->in.args[0].value = arg; 959 req->out.numargs = 1; 960 /* Variable length argument used for backward compatibility 961 with interface version < 7.5. Rest of init_out is zeroed 962 by do_get_request(), so a short reply is not a problem */ 963 req->out.argvar = 1; 964 req->out.args[0].size = sizeof(struct fuse_init_out); 965 req->out.args[0].value = &req->misc.init_out; 966 req->end = process_init_reply; 967 fuse_request_send_background(fc, req); 968 } 969 970 static void fuse_free_conn(struct fuse_conn *fc) 971 { 972 WARN_ON(!list_empty(&fc->devices)); 973 kfree_rcu(fc, rcu); 974 } 975 976 static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) 977 { 978 int err; 979 980 fc->bdi.name = "fuse"; 981 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE; 982 /* fuse does it's own writeback accounting */ 983 fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; 984 985 err = bdi_init(&fc->bdi); 986 if (err) 987 return err; 988 989 fc->bdi_initialized = 1; 990 991 if (sb->s_bdev) { 992 err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", 993 MAJOR(fc->dev), MINOR(fc->dev)); 994 } else { 995 err = bdi_register_dev(&fc->bdi, fc->dev); 996 } 997 998 if (err) 999 return err; 1000 1001 /* 1002 * For a single fuse filesystem use max 1% of dirty + 1003 * writeback threshold. 1004 * 1005 * This gives about 1M of write buffer for memory maps on a 1006 * machine with 1G and 10% dirty_ratio, which should be more 1007 * than enough. 1008 * 1009 * Privileged users can raise it by writing to 1010 * 1011 * /sys/class/bdi/<bdi>/max_ratio 1012 */ 1013 bdi_set_max_ratio(&fc->bdi, 1); 1014 1015 return 0; 1016 } 1017 1018 struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc) 1019 { 1020 struct fuse_dev *fud; 1021 1022 fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); 1023 if (fud) { 1024 fud->fc = fuse_conn_get(fc); 1025 fuse_pqueue_init(&fud->pq); 1026 1027 spin_lock(&fc->lock); 1028 list_add_tail(&fud->entry, &fc->devices); 1029 spin_unlock(&fc->lock); 1030 } 1031 1032 return fud; 1033 } 1034 EXPORT_SYMBOL_GPL(fuse_dev_alloc); 1035 1036 void fuse_dev_free(struct fuse_dev *fud) 1037 { 1038 struct fuse_conn *fc = fud->fc; 1039 1040 if (fc) { 1041 spin_lock(&fc->lock); 1042 list_del(&fud->entry); 1043 spin_unlock(&fc->lock); 1044 1045 fuse_conn_put(fc); 1046 } 1047 kfree(fud); 1048 } 1049 EXPORT_SYMBOL_GPL(fuse_dev_free); 1050 1051 static int fuse_fill_super(struct super_block *sb, void *data, int silent) 1052 { 1053 struct fuse_dev *fud; 1054 struct fuse_conn *fc; 1055 struct inode *root; 1056 struct fuse_mount_data d; 1057 struct file *file; 1058 struct dentry *root_dentry; 1059 struct fuse_req *init_req; 1060 int err; 1061 int is_bdev = sb->s_bdev != NULL; 1062 1063 err = -EINVAL; 1064 if (sb->s_flags & MS_MANDLOCK) 1065 goto err; 1066 1067 sb->s_flags &= ~(MS_NOSEC | MS_I_VERSION); 1068 1069 if (!parse_fuse_opt(data, &d, is_bdev)) 1070 goto err; 1071 1072 if (is_bdev) { 1073 #ifdef CONFIG_BLOCK 1074 err = -EINVAL; 1075 if (!sb_set_blocksize(sb, d.blksize)) 1076 goto err; 1077 #endif 1078 } else { 1079 sb->s_blocksize = PAGE_SIZE; 1080 sb->s_blocksize_bits = PAGE_SHIFT; 1081 } 1082 sb->s_magic = FUSE_SUPER_MAGIC; 1083 sb->s_op = &fuse_super_operations; 1084 sb->s_xattr = fuse_xattr_handlers; 1085 sb->s_maxbytes = MAX_LFS_FILESIZE; 1086 sb->s_time_gran = 1; 1087 sb->s_export_op = &fuse_export_operations; 1088 1089 file = fget(d.fd); 1090 err = -EINVAL; 1091 if (!file) 1092 goto err; 1093 1094 if ((file->f_op != &fuse_dev_operations) || 1095 (file->f_cred->user_ns != &init_user_ns)) 1096 goto err_fput; 1097 1098 fc = kmalloc(sizeof(*fc), GFP_KERNEL); 1099 err = -ENOMEM; 1100 if (!fc) 1101 goto err_fput; 1102 1103 fuse_conn_init(fc); 1104 fc->release = fuse_free_conn; 1105 1106 fud = fuse_dev_alloc(fc); 1107 if (!fud) 1108 goto err_put_conn; 1109 1110 fc->dev = sb->s_dev; 1111 fc->sb = sb; 1112 err = fuse_bdi_init(fc, sb); 1113 if (err) 1114 goto err_dev_free; 1115 1116 sb->s_bdi = &fc->bdi; 1117 1118 /* Handle umasking inside the fuse code */ 1119 if (sb->s_flags & MS_POSIXACL) 1120 fc->dont_mask = 1; 1121 sb->s_flags |= MS_POSIXACL; 1122 1123 fc->default_permissions = d.default_permissions; 1124 fc->allow_other = d.allow_other; 1125 fc->user_id = d.user_id; 1126 fc->group_id = d.group_id; 1127 fc->max_read = max_t(unsigned, 4096, d.max_read); 1128 1129 /* Used by get_root_inode() */ 1130 sb->s_fs_info = fc; 1131 1132 err = -ENOMEM; 1133 root = fuse_get_root_inode(sb, d.rootmode); 1134 root_dentry = d_make_root(root); 1135 if (!root_dentry) 1136 goto err_dev_free; 1137 /* only now - we want root dentry with NULL ->d_op */ 1138 sb->s_d_op = &fuse_dentry_operations; 1139 1140 init_req = fuse_request_alloc(0); 1141 if (!init_req) 1142 goto err_put_root; 1143 __set_bit(FR_BACKGROUND, &init_req->flags); 1144 1145 if (is_bdev) { 1146 fc->destroy_req = fuse_request_alloc(0); 1147 if (!fc->destroy_req) 1148 goto err_free_init_req; 1149 } 1150 1151 mutex_lock(&fuse_mutex); 1152 err = -EINVAL; 1153 if (file->private_data) 1154 goto err_unlock; 1155 1156 err = fuse_ctl_add_conn(fc); 1157 if (err) 1158 goto err_unlock; 1159 1160 list_add_tail(&fc->entry, &fuse_conn_list); 1161 sb->s_root = root_dentry; 1162 file->private_data = fud; 1163 mutex_unlock(&fuse_mutex); 1164 /* 1165 * atomic_dec_and_test() in fput() provides the necessary 1166 * memory barrier for file->private_data to be visible on all 1167 * CPUs after this 1168 */ 1169 fput(file); 1170 1171 fuse_send_init(fc, init_req); 1172 1173 return 0; 1174 1175 err_unlock: 1176 mutex_unlock(&fuse_mutex); 1177 err_free_init_req: 1178 fuse_request_free(init_req); 1179 err_put_root: 1180 dput(root_dentry); 1181 err_dev_free: 1182 fuse_dev_free(fud); 1183 err_put_conn: 1184 fuse_bdi_destroy(fc); 1185 fuse_conn_put(fc); 1186 err_fput: 1187 fput(file); 1188 err: 1189 return err; 1190 } 1191 1192 static struct dentry *fuse_mount(struct file_system_type *fs_type, 1193 int flags, const char *dev_name, 1194 void *raw_data) 1195 { 1196 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); 1197 } 1198 1199 static void fuse_kill_sb_anon(struct super_block *sb) 1200 { 1201 struct fuse_conn *fc = get_fuse_conn_super(sb); 1202 1203 if (fc) { 1204 down_write(&fc->killsb); 1205 fc->sb = NULL; 1206 up_write(&fc->killsb); 1207 } 1208 1209 kill_anon_super(sb); 1210 } 1211 1212 static struct file_system_type fuse_fs_type = { 1213 .owner = THIS_MODULE, 1214 .name = "fuse", 1215 .fs_flags = FS_HAS_SUBTYPE, 1216 .mount = fuse_mount, 1217 .kill_sb = fuse_kill_sb_anon, 1218 }; 1219 MODULE_ALIAS_FS("fuse"); 1220 1221 #ifdef CONFIG_BLOCK 1222 static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, 1223 int flags, const char *dev_name, 1224 void *raw_data) 1225 { 1226 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); 1227 } 1228 1229 static void fuse_kill_sb_blk(struct super_block *sb) 1230 { 1231 struct fuse_conn *fc = get_fuse_conn_super(sb); 1232 1233 if (fc) { 1234 down_write(&fc->killsb); 1235 fc->sb = NULL; 1236 up_write(&fc->killsb); 1237 } 1238 1239 kill_block_super(sb); 1240 } 1241 1242 static struct file_system_type fuseblk_fs_type = { 1243 .owner = THIS_MODULE, 1244 .name = "fuseblk", 1245 .mount = fuse_mount_blk, 1246 .kill_sb = fuse_kill_sb_blk, 1247 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, 1248 }; 1249 MODULE_ALIAS_FS("fuseblk"); 1250 1251 static inline int register_fuseblk(void) 1252 { 1253 return register_filesystem(&fuseblk_fs_type); 1254 } 1255 1256 static inline void unregister_fuseblk(void) 1257 { 1258 unregister_filesystem(&fuseblk_fs_type); 1259 } 1260 #else 1261 static inline int register_fuseblk(void) 1262 { 1263 return 0; 1264 } 1265 1266 static inline void unregister_fuseblk(void) 1267 { 1268 } 1269 #endif 1270 1271 static void fuse_inode_init_once(void *foo) 1272 { 1273 struct inode *inode = foo; 1274 1275 inode_init_once(inode); 1276 } 1277 1278 static int __init fuse_fs_init(void) 1279 { 1280 int err; 1281 1282 fuse_inode_cachep = kmem_cache_create("fuse_inode", 1283 sizeof(struct fuse_inode), 0, 1284 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, 1285 fuse_inode_init_once); 1286 err = -ENOMEM; 1287 if (!fuse_inode_cachep) 1288 goto out; 1289 1290 err = register_fuseblk(); 1291 if (err) 1292 goto out2; 1293 1294 err = register_filesystem(&fuse_fs_type); 1295 if (err) 1296 goto out3; 1297 1298 return 0; 1299 1300 out3: 1301 unregister_fuseblk(); 1302 out2: 1303 kmem_cache_destroy(fuse_inode_cachep); 1304 out: 1305 return err; 1306 } 1307 1308 static void fuse_fs_cleanup(void) 1309 { 1310 unregister_filesystem(&fuse_fs_type); 1311 unregister_fuseblk(); 1312 1313 /* 1314 * Make sure all delayed rcu free inodes are flushed before we 1315 * destroy cache. 1316 */ 1317 rcu_barrier(); 1318 kmem_cache_destroy(fuse_inode_cachep); 1319 } 1320 1321 static struct kobject *fuse_kobj; 1322 1323 static int fuse_sysfs_init(void) 1324 { 1325 int err; 1326 1327 fuse_kobj = kobject_create_and_add("fuse", fs_kobj); 1328 if (!fuse_kobj) { 1329 err = -ENOMEM; 1330 goto out_err; 1331 } 1332 1333 err = sysfs_create_mount_point(fuse_kobj, "connections"); 1334 if (err) 1335 goto out_fuse_unregister; 1336 1337 return 0; 1338 1339 out_fuse_unregister: 1340 kobject_put(fuse_kobj); 1341 out_err: 1342 return err; 1343 } 1344 1345 static void fuse_sysfs_cleanup(void) 1346 { 1347 sysfs_remove_mount_point(fuse_kobj, "connections"); 1348 kobject_put(fuse_kobj); 1349 } 1350 1351 static int __init fuse_init(void) 1352 { 1353 int res; 1354 1355 printk(KERN_INFO "fuse init (API version %i.%i)\n", 1356 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); 1357 1358 INIT_LIST_HEAD(&fuse_conn_list); 1359 res = fuse_fs_init(); 1360 if (res) 1361 goto err; 1362 1363 res = fuse_dev_init(); 1364 if (res) 1365 goto err_fs_cleanup; 1366 1367 res = fuse_sysfs_init(); 1368 if (res) 1369 goto err_dev_cleanup; 1370 1371 res = fuse_ctl_init(); 1372 if (res) 1373 goto err_sysfs_cleanup; 1374 1375 sanitize_global_limit(&max_user_bgreq); 1376 sanitize_global_limit(&max_user_congthresh); 1377 1378 return 0; 1379 1380 err_sysfs_cleanup: 1381 fuse_sysfs_cleanup(); 1382 err_dev_cleanup: 1383 fuse_dev_cleanup(); 1384 err_fs_cleanup: 1385 fuse_fs_cleanup(); 1386 err: 1387 return res; 1388 } 1389 1390 static void __exit fuse_exit(void) 1391 { 1392 printk(KERN_DEBUG "fuse exit\n"); 1393 1394 fuse_ctl_cleanup(); 1395 fuse_sysfs_cleanup(); 1396 fuse_fs_cleanup(); 1397 fuse_dev_cleanup(); 1398 } 1399 1400 module_init(fuse_init); 1401 module_exit(fuse_exit); 1402