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, const 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 & SB_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 & SB_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(fc->user_ns, attr->uid); 175 inode->i_gid = make_kgid(fc->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 timespec64 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 timespec64 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 (!timespec64_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 bool fuse_lock_inode(struct inode *inode) 361 { 362 bool locked = false; 363 364 if (!get_fuse_conn(inode)->parallel_dirops) { 365 mutex_lock(&get_fuse_inode(inode)->mutex); 366 locked = true; 367 } 368 369 return locked; 370 } 371 372 void fuse_unlock_inode(struct inode *inode, bool locked) 373 { 374 if (locked) 375 mutex_unlock(&get_fuse_inode(inode)->mutex); 376 } 377 378 static void fuse_umount_begin(struct super_block *sb) 379 { 380 fuse_abort_conn(get_fuse_conn_super(sb), false); 381 } 382 383 static void fuse_send_destroy(struct fuse_conn *fc) 384 { 385 struct fuse_req *req = fc->destroy_req; 386 if (req && fc->conn_init) { 387 fc->destroy_req = NULL; 388 req->in.h.opcode = FUSE_DESTROY; 389 __set_bit(FR_FORCE, &req->flags); 390 __clear_bit(FR_BACKGROUND, &req->flags); 391 fuse_request_send(fc, req); 392 fuse_put_request(fc, req); 393 } 394 } 395 396 static void fuse_put_super(struct super_block *sb) 397 { 398 struct fuse_conn *fc = get_fuse_conn_super(sb); 399 400 mutex_lock(&fuse_mutex); 401 list_del(&fc->entry); 402 fuse_ctl_remove_conn(fc); 403 mutex_unlock(&fuse_mutex); 404 405 fuse_conn_put(fc); 406 } 407 408 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) 409 { 410 stbuf->f_type = FUSE_SUPER_MAGIC; 411 stbuf->f_bsize = attr->bsize; 412 stbuf->f_frsize = attr->frsize; 413 stbuf->f_blocks = attr->blocks; 414 stbuf->f_bfree = attr->bfree; 415 stbuf->f_bavail = attr->bavail; 416 stbuf->f_files = attr->files; 417 stbuf->f_ffree = attr->ffree; 418 stbuf->f_namelen = attr->namelen; 419 /* fsid is left zero */ 420 } 421 422 static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) 423 { 424 struct super_block *sb = dentry->d_sb; 425 struct fuse_conn *fc = get_fuse_conn_super(sb); 426 FUSE_ARGS(args); 427 struct fuse_statfs_out outarg; 428 int err; 429 430 if (!fuse_allow_current_process(fc)) { 431 buf->f_type = FUSE_SUPER_MAGIC; 432 return 0; 433 } 434 435 memset(&outarg, 0, sizeof(outarg)); 436 args.in.numargs = 0; 437 args.in.h.opcode = FUSE_STATFS; 438 args.in.h.nodeid = get_node_id(d_inode(dentry)); 439 args.out.numargs = 1; 440 args.out.args[0].size = sizeof(outarg); 441 args.out.args[0].value = &outarg; 442 err = fuse_simple_request(fc, &args); 443 if (!err) 444 convert_fuse_statfs(buf, &outarg.st); 445 return err; 446 } 447 448 enum { 449 OPT_FD, 450 OPT_ROOTMODE, 451 OPT_USER_ID, 452 OPT_GROUP_ID, 453 OPT_DEFAULT_PERMISSIONS, 454 OPT_ALLOW_OTHER, 455 OPT_MAX_READ, 456 OPT_BLKSIZE, 457 OPT_ERR 458 }; 459 460 static const match_table_t tokens = { 461 {OPT_FD, "fd=%u"}, 462 {OPT_ROOTMODE, "rootmode=%o"}, 463 {OPT_USER_ID, "user_id=%u"}, 464 {OPT_GROUP_ID, "group_id=%u"}, 465 {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, 466 {OPT_ALLOW_OTHER, "allow_other"}, 467 {OPT_MAX_READ, "max_read=%u"}, 468 {OPT_BLKSIZE, "blksize=%u"}, 469 {OPT_ERR, NULL} 470 }; 471 472 static int fuse_match_uint(substring_t *s, unsigned int *res) 473 { 474 int err = -ENOMEM; 475 char *buf = match_strdup(s); 476 if (buf) { 477 err = kstrtouint(buf, 10, res); 478 kfree(buf); 479 } 480 return err; 481 } 482 483 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev, 484 struct user_namespace *user_ns) 485 { 486 char *p; 487 memset(d, 0, sizeof(struct fuse_mount_data)); 488 d->max_read = ~0; 489 d->blksize = FUSE_DEFAULT_BLKSIZE; 490 491 while ((p = strsep(&opt, ",")) != NULL) { 492 int token; 493 int value; 494 unsigned uv; 495 substring_t args[MAX_OPT_ARGS]; 496 if (!*p) 497 continue; 498 499 token = match_token(p, tokens, args); 500 switch (token) { 501 case OPT_FD: 502 if (match_int(&args[0], &value)) 503 return 0; 504 d->fd = value; 505 d->fd_present = 1; 506 break; 507 508 case OPT_ROOTMODE: 509 if (match_octal(&args[0], &value)) 510 return 0; 511 if (!fuse_valid_type(value)) 512 return 0; 513 d->rootmode = value; 514 d->rootmode_present = 1; 515 break; 516 517 case OPT_USER_ID: 518 if (fuse_match_uint(&args[0], &uv)) 519 return 0; 520 d->user_id = make_kuid(user_ns, uv); 521 if (!uid_valid(d->user_id)) 522 return 0; 523 d->user_id_present = 1; 524 break; 525 526 case OPT_GROUP_ID: 527 if (fuse_match_uint(&args[0], &uv)) 528 return 0; 529 d->group_id = make_kgid(user_ns, uv); 530 if (!gid_valid(d->group_id)) 531 return 0; 532 d->group_id_present = 1; 533 break; 534 535 case OPT_DEFAULT_PERMISSIONS: 536 d->default_permissions = 1; 537 break; 538 539 case OPT_ALLOW_OTHER: 540 d->allow_other = 1; 541 break; 542 543 case OPT_MAX_READ: 544 if (match_int(&args[0], &value)) 545 return 0; 546 d->max_read = value; 547 break; 548 549 case OPT_BLKSIZE: 550 if (!is_bdev || match_int(&args[0], &value)) 551 return 0; 552 d->blksize = value; 553 break; 554 555 default: 556 return 0; 557 } 558 } 559 560 if (!d->fd_present || !d->rootmode_present || 561 !d->user_id_present || !d->group_id_present) 562 return 0; 563 564 return 1; 565 } 566 567 static int fuse_show_options(struct seq_file *m, struct dentry *root) 568 { 569 struct super_block *sb = root->d_sb; 570 struct fuse_conn *fc = get_fuse_conn_super(sb); 571 572 seq_printf(m, ",user_id=%u", from_kuid_munged(fc->user_ns, fc->user_id)); 573 seq_printf(m, ",group_id=%u", from_kgid_munged(fc->user_ns, fc->group_id)); 574 if (fc->default_permissions) 575 seq_puts(m, ",default_permissions"); 576 if (fc->allow_other) 577 seq_puts(m, ",allow_other"); 578 if (fc->max_read != ~0) 579 seq_printf(m, ",max_read=%u", fc->max_read); 580 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE) 581 seq_printf(m, ",blksize=%lu", sb->s_blocksize); 582 return 0; 583 } 584 585 static void fuse_iqueue_init(struct fuse_iqueue *fiq) 586 { 587 memset(fiq, 0, sizeof(struct fuse_iqueue)); 588 init_waitqueue_head(&fiq->waitq); 589 INIT_LIST_HEAD(&fiq->pending); 590 INIT_LIST_HEAD(&fiq->interrupts); 591 fiq->forget_list_tail = &fiq->forget_list_head; 592 fiq->connected = 1; 593 } 594 595 static void fuse_pqueue_init(struct fuse_pqueue *fpq) 596 { 597 memset(fpq, 0, sizeof(struct fuse_pqueue)); 598 spin_lock_init(&fpq->lock); 599 INIT_LIST_HEAD(&fpq->processing); 600 INIT_LIST_HEAD(&fpq->io); 601 fpq->connected = 1; 602 } 603 604 void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns) 605 { 606 memset(fc, 0, sizeof(*fc)); 607 spin_lock_init(&fc->lock); 608 init_rwsem(&fc->killsb); 609 refcount_set(&fc->count, 1); 610 atomic_set(&fc->dev_count, 1); 611 init_waitqueue_head(&fc->blocked_waitq); 612 init_waitqueue_head(&fc->reserved_req_waitq); 613 fuse_iqueue_init(&fc->iq); 614 INIT_LIST_HEAD(&fc->bg_queue); 615 INIT_LIST_HEAD(&fc->entry); 616 INIT_LIST_HEAD(&fc->devices); 617 atomic_set(&fc->num_waiting, 0); 618 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND; 619 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD; 620 fc->khctr = 0; 621 fc->polled_files = RB_ROOT; 622 fc->blocked = 0; 623 fc->initialized = 0; 624 fc->connected = 1; 625 fc->attr_version = 1; 626 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); 627 fc->pid_ns = get_pid_ns(task_active_pid_ns(current)); 628 fc->user_ns = get_user_ns(user_ns); 629 } 630 EXPORT_SYMBOL_GPL(fuse_conn_init); 631 632 void fuse_conn_put(struct fuse_conn *fc) 633 { 634 if (refcount_dec_and_test(&fc->count)) { 635 if (fc->destroy_req) 636 fuse_request_free(fc->destroy_req); 637 put_pid_ns(fc->pid_ns); 638 put_user_ns(fc->user_ns); 639 fc->release(fc); 640 } 641 } 642 EXPORT_SYMBOL_GPL(fuse_conn_put); 643 644 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) 645 { 646 refcount_inc(&fc->count); 647 return fc; 648 } 649 EXPORT_SYMBOL_GPL(fuse_conn_get); 650 651 static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) 652 { 653 struct fuse_attr attr; 654 memset(&attr, 0, sizeof(attr)); 655 656 attr.mode = mode; 657 attr.ino = FUSE_ROOT_ID; 658 attr.nlink = 1; 659 return fuse_iget(sb, 1, 0, &attr, 0, 0); 660 } 661 662 struct fuse_inode_handle { 663 u64 nodeid; 664 u32 generation; 665 }; 666 667 static struct dentry *fuse_get_dentry(struct super_block *sb, 668 struct fuse_inode_handle *handle) 669 { 670 struct fuse_conn *fc = get_fuse_conn_super(sb); 671 struct inode *inode; 672 struct dentry *entry; 673 int err = -ESTALE; 674 675 if (handle->nodeid == 0) 676 goto out_err; 677 678 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); 679 if (!inode) { 680 struct fuse_entry_out outarg; 681 const struct qstr name = QSTR_INIT(".", 1); 682 683 if (!fc->export_support) 684 goto out_err; 685 686 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg, 687 &inode); 688 if (err && err != -ENOENT) 689 goto out_err; 690 if (err || !inode) { 691 err = -ESTALE; 692 goto out_err; 693 } 694 err = -EIO; 695 if (get_node_id(inode) != handle->nodeid) 696 goto out_iput; 697 } 698 err = -ESTALE; 699 if (inode->i_generation != handle->generation) 700 goto out_iput; 701 702 entry = d_obtain_alias(inode); 703 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) 704 fuse_invalidate_entry_cache(entry); 705 706 return entry; 707 708 out_iput: 709 iput(inode); 710 out_err: 711 return ERR_PTR(err); 712 } 713 714 static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len, 715 struct inode *parent) 716 { 717 int len = parent ? 6 : 3; 718 u64 nodeid; 719 u32 generation; 720 721 if (*max_len < len) { 722 *max_len = len; 723 return FILEID_INVALID; 724 } 725 726 nodeid = get_fuse_inode(inode)->nodeid; 727 generation = inode->i_generation; 728 729 fh[0] = (u32)(nodeid >> 32); 730 fh[1] = (u32)(nodeid & 0xffffffff); 731 fh[2] = generation; 732 733 if (parent) { 734 nodeid = get_fuse_inode(parent)->nodeid; 735 generation = parent->i_generation; 736 737 fh[3] = (u32)(nodeid >> 32); 738 fh[4] = (u32)(nodeid & 0xffffffff); 739 fh[5] = generation; 740 } 741 742 *max_len = len; 743 return parent ? 0x82 : 0x81; 744 } 745 746 static struct dentry *fuse_fh_to_dentry(struct super_block *sb, 747 struct fid *fid, int fh_len, int fh_type) 748 { 749 struct fuse_inode_handle handle; 750 751 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3) 752 return NULL; 753 754 handle.nodeid = (u64) fid->raw[0] << 32; 755 handle.nodeid |= (u64) fid->raw[1]; 756 handle.generation = fid->raw[2]; 757 return fuse_get_dentry(sb, &handle); 758 } 759 760 static struct dentry *fuse_fh_to_parent(struct super_block *sb, 761 struct fid *fid, int fh_len, int fh_type) 762 { 763 struct fuse_inode_handle parent; 764 765 if (fh_type != 0x82 || fh_len < 6) 766 return NULL; 767 768 parent.nodeid = (u64) fid->raw[3] << 32; 769 parent.nodeid |= (u64) fid->raw[4]; 770 parent.generation = fid->raw[5]; 771 return fuse_get_dentry(sb, &parent); 772 } 773 774 static struct dentry *fuse_get_parent(struct dentry *child) 775 { 776 struct inode *child_inode = d_inode(child); 777 struct fuse_conn *fc = get_fuse_conn(child_inode); 778 struct inode *inode; 779 struct dentry *parent; 780 struct fuse_entry_out outarg; 781 const struct qstr name = QSTR_INIT("..", 2); 782 int err; 783 784 if (!fc->export_support) 785 return ERR_PTR(-ESTALE); 786 787 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode), 788 &name, &outarg, &inode); 789 if (err) { 790 if (err == -ENOENT) 791 return ERR_PTR(-ESTALE); 792 return ERR_PTR(err); 793 } 794 795 parent = d_obtain_alias(inode); 796 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) 797 fuse_invalidate_entry_cache(parent); 798 799 return parent; 800 } 801 802 static const struct export_operations fuse_export_operations = { 803 .fh_to_dentry = fuse_fh_to_dentry, 804 .fh_to_parent = fuse_fh_to_parent, 805 .encode_fh = fuse_encode_fh, 806 .get_parent = fuse_get_parent, 807 }; 808 809 static const struct super_operations fuse_super_operations = { 810 .alloc_inode = fuse_alloc_inode, 811 .destroy_inode = fuse_destroy_inode, 812 .evict_inode = fuse_evict_inode, 813 .write_inode = fuse_write_inode, 814 .drop_inode = generic_delete_inode, 815 .remount_fs = fuse_remount_fs, 816 .put_super = fuse_put_super, 817 .umount_begin = fuse_umount_begin, 818 .statfs = fuse_statfs, 819 .show_options = fuse_show_options, 820 }; 821 822 static void sanitize_global_limit(unsigned *limit) 823 { 824 if (*limit == 0) 825 *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / 826 sizeof(struct fuse_req); 827 828 if (*limit >= 1 << 16) 829 *limit = (1 << 16) - 1; 830 } 831 832 static int set_global_limit(const char *val, const struct kernel_param *kp) 833 { 834 int rv; 835 836 rv = param_set_uint(val, kp); 837 if (rv) 838 return rv; 839 840 sanitize_global_limit((unsigned *)kp->arg); 841 842 return 0; 843 } 844 845 static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg) 846 { 847 int cap_sys_admin = capable(CAP_SYS_ADMIN); 848 849 if (arg->minor < 13) 850 return; 851 852 sanitize_global_limit(&max_user_bgreq); 853 sanitize_global_limit(&max_user_congthresh); 854 855 if (arg->max_background) { 856 fc->max_background = arg->max_background; 857 858 if (!cap_sys_admin && fc->max_background > max_user_bgreq) 859 fc->max_background = max_user_bgreq; 860 } 861 if (arg->congestion_threshold) { 862 fc->congestion_threshold = arg->congestion_threshold; 863 864 if (!cap_sys_admin && 865 fc->congestion_threshold > max_user_congthresh) 866 fc->congestion_threshold = max_user_congthresh; 867 } 868 } 869 870 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 871 { 872 struct fuse_init_out *arg = &req->misc.init_out; 873 874 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) 875 fc->conn_error = 1; 876 else { 877 unsigned long ra_pages; 878 879 process_init_limits(fc, arg); 880 881 if (arg->minor >= 6) { 882 ra_pages = arg->max_readahead / PAGE_SIZE; 883 if (arg->flags & FUSE_ASYNC_READ) 884 fc->async_read = 1; 885 if (!(arg->flags & FUSE_POSIX_LOCKS)) 886 fc->no_lock = 1; 887 if (arg->minor >= 17) { 888 if (!(arg->flags & FUSE_FLOCK_LOCKS)) 889 fc->no_flock = 1; 890 } else { 891 if (!(arg->flags & FUSE_POSIX_LOCKS)) 892 fc->no_flock = 1; 893 } 894 if (arg->flags & FUSE_ATOMIC_O_TRUNC) 895 fc->atomic_o_trunc = 1; 896 if (arg->minor >= 9) { 897 /* LOOKUP has dependency on proto version */ 898 if (arg->flags & FUSE_EXPORT_SUPPORT) 899 fc->export_support = 1; 900 } 901 if (arg->flags & FUSE_BIG_WRITES) 902 fc->big_writes = 1; 903 if (arg->flags & FUSE_DONT_MASK) 904 fc->dont_mask = 1; 905 if (arg->flags & FUSE_AUTO_INVAL_DATA) 906 fc->auto_inval_data = 1; 907 if (arg->flags & FUSE_DO_READDIRPLUS) { 908 fc->do_readdirplus = 1; 909 if (arg->flags & FUSE_READDIRPLUS_AUTO) 910 fc->readdirplus_auto = 1; 911 } 912 if (arg->flags & FUSE_ASYNC_DIO) 913 fc->async_dio = 1; 914 if (arg->flags & FUSE_WRITEBACK_CACHE) 915 fc->writeback_cache = 1; 916 if (arg->flags & FUSE_PARALLEL_DIROPS) 917 fc->parallel_dirops = 1; 918 if (arg->flags & FUSE_HANDLE_KILLPRIV) 919 fc->handle_killpriv = 1; 920 if (arg->time_gran && arg->time_gran <= 1000000000) 921 fc->sb->s_time_gran = arg->time_gran; 922 if ((arg->flags & FUSE_POSIX_ACL)) { 923 fc->default_permissions = 1; 924 fc->posix_acl = 1; 925 fc->sb->s_xattr = fuse_acl_xattr_handlers; 926 } 927 if (arg->flags & FUSE_ABORT_ERROR) 928 fc->abort_err = 1; 929 } else { 930 ra_pages = fc->max_read / PAGE_SIZE; 931 fc->no_lock = 1; 932 fc->no_flock = 1; 933 } 934 935 fc->sb->s_bdi->ra_pages = 936 min(fc->sb->s_bdi->ra_pages, ra_pages); 937 fc->minor = arg->minor; 938 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; 939 fc->max_write = max_t(unsigned, 4096, fc->max_write); 940 fc->conn_init = 1; 941 } 942 fuse_set_initialized(fc); 943 wake_up_all(&fc->blocked_waitq); 944 } 945 946 static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) 947 { 948 struct fuse_init_in *arg = &req->misc.init_in; 949 950 arg->major = FUSE_KERNEL_VERSION; 951 arg->minor = FUSE_KERNEL_MINOR_VERSION; 952 arg->max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE; 953 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC | 954 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK | 955 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ | 956 FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA | 957 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO | 958 FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT | 959 FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL | 960 FUSE_ABORT_ERROR; 961 req->in.h.opcode = FUSE_INIT; 962 req->in.numargs = 1; 963 req->in.args[0].size = sizeof(*arg); 964 req->in.args[0].value = arg; 965 req->out.numargs = 1; 966 /* Variable length argument used for backward compatibility 967 with interface version < 7.5. Rest of init_out is zeroed 968 by do_get_request(), so a short reply is not a problem */ 969 req->out.argvar = 1; 970 req->out.args[0].size = sizeof(struct fuse_init_out); 971 req->out.args[0].value = &req->misc.init_out; 972 req->end = process_init_reply; 973 fuse_request_send_background(fc, req); 974 } 975 976 static void fuse_free_conn(struct fuse_conn *fc) 977 { 978 WARN_ON(!list_empty(&fc->devices)); 979 kfree_rcu(fc, rcu); 980 } 981 982 static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) 983 { 984 int err; 985 char *suffix = ""; 986 987 if (sb->s_bdev) { 988 suffix = "-fuseblk"; 989 /* 990 * sb->s_bdi points to blkdev's bdi however we want to redirect 991 * it to our private bdi... 992 */ 993 bdi_put(sb->s_bdi); 994 sb->s_bdi = &noop_backing_dev_info; 995 } 996 err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev), 997 MINOR(fc->dev), suffix); 998 if (err) 999 return err; 1000 1001 sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE; 1002 /* fuse does it's own writeback accounting */ 1003 sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT; 1004 1005 /* 1006 * For a single fuse filesystem use max 1% of dirty + 1007 * writeback threshold. 1008 * 1009 * This gives about 1M of write buffer for memory maps on a 1010 * machine with 1G and 10% dirty_ratio, which should be more 1011 * than enough. 1012 * 1013 * Privileged users can raise it by writing to 1014 * 1015 * /sys/class/bdi/<bdi>/max_ratio 1016 */ 1017 bdi_set_max_ratio(sb->s_bdi, 1); 1018 1019 return 0; 1020 } 1021 1022 struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc) 1023 { 1024 struct fuse_dev *fud; 1025 1026 fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL); 1027 if (fud) { 1028 fud->fc = fuse_conn_get(fc); 1029 fuse_pqueue_init(&fud->pq); 1030 1031 spin_lock(&fc->lock); 1032 list_add_tail(&fud->entry, &fc->devices); 1033 spin_unlock(&fc->lock); 1034 } 1035 1036 return fud; 1037 } 1038 EXPORT_SYMBOL_GPL(fuse_dev_alloc); 1039 1040 void fuse_dev_free(struct fuse_dev *fud) 1041 { 1042 struct fuse_conn *fc = fud->fc; 1043 1044 if (fc) { 1045 spin_lock(&fc->lock); 1046 list_del(&fud->entry); 1047 spin_unlock(&fc->lock); 1048 1049 fuse_conn_put(fc); 1050 } 1051 kfree(fud); 1052 } 1053 EXPORT_SYMBOL_GPL(fuse_dev_free); 1054 1055 static int fuse_fill_super(struct super_block *sb, void *data, int silent) 1056 { 1057 struct fuse_dev *fud; 1058 struct fuse_conn *fc; 1059 struct inode *root; 1060 struct fuse_mount_data d; 1061 struct file *file; 1062 struct dentry *root_dentry; 1063 struct fuse_req *init_req; 1064 int err; 1065 int is_bdev = sb->s_bdev != NULL; 1066 1067 err = -EINVAL; 1068 if (sb->s_flags & SB_MANDLOCK) 1069 goto err; 1070 1071 sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION); 1072 1073 if (!parse_fuse_opt(data, &d, is_bdev, sb->s_user_ns)) 1074 goto err; 1075 1076 if (is_bdev) { 1077 #ifdef CONFIG_BLOCK 1078 err = -EINVAL; 1079 if (!sb_set_blocksize(sb, d.blksize)) 1080 goto err; 1081 #endif 1082 } else { 1083 sb->s_blocksize = PAGE_SIZE; 1084 sb->s_blocksize_bits = PAGE_SHIFT; 1085 } 1086 sb->s_magic = FUSE_SUPER_MAGIC; 1087 sb->s_op = &fuse_super_operations; 1088 sb->s_xattr = fuse_xattr_handlers; 1089 sb->s_maxbytes = MAX_LFS_FILESIZE; 1090 sb->s_time_gran = 1; 1091 sb->s_export_op = &fuse_export_operations; 1092 sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE; 1093 if (sb->s_user_ns != &init_user_ns) 1094 sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER; 1095 1096 file = fget(d.fd); 1097 err = -EINVAL; 1098 if (!file) 1099 goto err; 1100 1101 /* 1102 * Require mount to happen from the same user namespace which 1103 * opened /dev/fuse to prevent potential attacks. 1104 */ 1105 if (file->f_op != &fuse_dev_operations || 1106 file->f_cred->user_ns != sb->s_user_ns) 1107 goto err_fput; 1108 1109 /* 1110 * If we are not in the initial user namespace posix 1111 * acls must be translated. 1112 */ 1113 if (sb->s_user_ns != &init_user_ns) 1114 sb->s_xattr = fuse_no_acl_xattr_handlers; 1115 1116 fc = kmalloc(sizeof(*fc), GFP_KERNEL); 1117 err = -ENOMEM; 1118 if (!fc) 1119 goto err_fput; 1120 1121 fuse_conn_init(fc, sb->s_user_ns); 1122 fc->release = fuse_free_conn; 1123 1124 fud = fuse_dev_alloc(fc); 1125 if (!fud) 1126 goto err_put_conn; 1127 1128 fc->dev = sb->s_dev; 1129 fc->sb = sb; 1130 err = fuse_bdi_init(fc, sb); 1131 if (err) 1132 goto err_dev_free; 1133 1134 /* Handle umasking inside the fuse code */ 1135 if (sb->s_flags & SB_POSIXACL) 1136 fc->dont_mask = 1; 1137 sb->s_flags |= SB_POSIXACL; 1138 1139 fc->default_permissions = d.default_permissions; 1140 fc->allow_other = d.allow_other; 1141 fc->user_id = d.user_id; 1142 fc->group_id = d.group_id; 1143 fc->max_read = max_t(unsigned, 4096, d.max_read); 1144 1145 /* Used by get_root_inode() */ 1146 sb->s_fs_info = fc; 1147 1148 err = -ENOMEM; 1149 root = fuse_get_root_inode(sb, d.rootmode); 1150 sb->s_d_op = &fuse_root_dentry_operations; 1151 root_dentry = d_make_root(root); 1152 if (!root_dentry) 1153 goto err_dev_free; 1154 /* Root dentry doesn't have .d_revalidate */ 1155 sb->s_d_op = &fuse_dentry_operations; 1156 1157 init_req = fuse_request_alloc(0); 1158 if (!init_req) 1159 goto err_put_root; 1160 __set_bit(FR_BACKGROUND, &init_req->flags); 1161 1162 if (is_bdev) { 1163 fc->destroy_req = fuse_request_alloc(0); 1164 if (!fc->destroy_req) 1165 goto err_free_init_req; 1166 } 1167 1168 mutex_lock(&fuse_mutex); 1169 err = -EINVAL; 1170 if (file->private_data) 1171 goto err_unlock; 1172 1173 err = fuse_ctl_add_conn(fc); 1174 if (err) 1175 goto err_unlock; 1176 1177 list_add_tail(&fc->entry, &fuse_conn_list); 1178 sb->s_root = root_dentry; 1179 file->private_data = fud; 1180 mutex_unlock(&fuse_mutex); 1181 /* 1182 * atomic_dec_and_test() in fput() provides the necessary 1183 * memory barrier for file->private_data to be visible on all 1184 * CPUs after this 1185 */ 1186 fput(file); 1187 1188 fuse_send_init(fc, init_req); 1189 1190 return 0; 1191 1192 err_unlock: 1193 mutex_unlock(&fuse_mutex); 1194 err_free_init_req: 1195 fuse_request_free(init_req); 1196 err_put_root: 1197 dput(root_dentry); 1198 err_dev_free: 1199 fuse_dev_free(fud); 1200 err_put_conn: 1201 fuse_conn_put(fc); 1202 sb->s_fs_info = NULL; 1203 err_fput: 1204 fput(file); 1205 err: 1206 return err; 1207 } 1208 1209 static struct dentry *fuse_mount(struct file_system_type *fs_type, 1210 int flags, const char *dev_name, 1211 void *raw_data) 1212 { 1213 return mount_nodev(fs_type, flags, raw_data, fuse_fill_super); 1214 } 1215 1216 static void fuse_sb_destroy(struct super_block *sb) 1217 { 1218 struct fuse_conn *fc = get_fuse_conn_super(sb); 1219 1220 if (fc) { 1221 fuse_send_destroy(fc); 1222 1223 fuse_abort_conn(fc, false); 1224 fuse_wait_aborted(fc); 1225 1226 down_write(&fc->killsb); 1227 fc->sb = NULL; 1228 up_write(&fc->killsb); 1229 } 1230 } 1231 1232 static void fuse_kill_sb_anon(struct super_block *sb) 1233 { 1234 fuse_sb_destroy(sb); 1235 kill_anon_super(sb); 1236 } 1237 1238 static struct file_system_type fuse_fs_type = { 1239 .owner = THIS_MODULE, 1240 .name = "fuse", 1241 .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT, 1242 .mount = fuse_mount, 1243 .kill_sb = fuse_kill_sb_anon, 1244 }; 1245 MODULE_ALIAS_FS("fuse"); 1246 1247 #ifdef CONFIG_BLOCK 1248 static struct dentry *fuse_mount_blk(struct file_system_type *fs_type, 1249 int flags, const char *dev_name, 1250 void *raw_data) 1251 { 1252 return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super); 1253 } 1254 1255 static void fuse_kill_sb_blk(struct super_block *sb) 1256 { 1257 fuse_sb_destroy(sb); 1258 kill_block_super(sb); 1259 } 1260 1261 static struct file_system_type fuseblk_fs_type = { 1262 .owner = THIS_MODULE, 1263 .name = "fuseblk", 1264 .mount = fuse_mount_blk, 1265 .kill_sb = fuse_kill_sb_blk, 1266 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, 1267 }; 1268 MODULE_ALIAS_FS("fuseblk"); 1269 1270 static inline int register_fuseblk(void) 1271 { 1272 return register_filesystem(&fuseblk_fs_type); 1273 } 1274 1275 static inline void unregister_fuseblk(void) 1276 { 1277 unregister_filesystem(&fuseblk_fs_type); 1278 } 1279 #else 1280 static inline int register_fuseblk(void) 1281 { 1282 return 0; 1283 } 1284 1285 static inline void unregister_fuseblk(void) 1286 { 1287 } 1288 #endif 1289 1290 static void fuse_inode_init_once(void *foo) 1291 { 1292 struct inode *inode = foo; 1293 1294 inode_init_once(inode); 1295 } 1296 1297 static int __init fuse_fs_init(void) 1298 { 1299 int err; 1300 1301 fuse_inode_cachep = kmem_cache_create("fuse_inode", 1302 sizeof(struct fuse_inode), 0, 1303 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT, 1304 fuse_inode_init_once); 1305 err = -ENOMEM; 1306 if (!fuse_inode_cachep) 1307 goto out; 1308 1309 err = register_fuseblk(); 1310 if (err) 1311 goto out2; 1312 1313 err = register_filesystem(&fuse_fs_type); 1314 if (err) 1315 goto out3; 1316 1317 return 0; 1318 1319 out3: 1320 unregister_fuseblk(); 1321 out2: 1322 kmem_cache_destroy(fuse_inode_cachep); 1323 out: 1324 return err; 1325 } 1326 1327 static void fuse_fs_cleanup(void) 1328 { 1329 unregister_filesystem(&fuse_fs_type); 1330 unregister_fuseblk(); 1331 1332 /* 1333 * Make sure all delayed rcu free inodes are flushed before we 1334 * destroy cache. 1335 */ 1336 rcu_barrier(); 1337 kmem_cache_destroy(fuse_inode_cachep); 1338 } 1339 1340 static struct kobject *fuse_kobj; 1341 1342 static int fuse_sysfs_init(void) 1343 { 1344 int err; 1345 1346 fuse_kobj = kobject_create_and_add("fuse", fs_kobj); 1347 if (!fuse_kobj) { 1348 err = -ENOMEM; 1349 goto out_err; 1350 } 1351 1352 err = sysfs_create_mount_point(fuse_kobj, "connections"); 1353 if (err) 1354 goto out_fuse_unregister; 1355 1356 return 0; 1357 1358 out_fuse_unregister: 1359 kobject_put(fuse_kobj); 1360 out_err: 1361 return err; 1362 } 1363 1364 static void fuse_sysfs_cleanup(void) 1365 { 1366 sysfs_remove_mount_point(fuse_kobj, "connections"); 1367 kobject_put(fuse_kobj); 1368 } 1369 1370 static int __init fuse_init(void) 1371 { 1372 int res; 1373 1374 printk(KERN_INFO "fuse init (API version %i.%i)\n", 1375 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); 1376 1377 INIT_LIST_HEAD(&fuse_conn_list); 1378 res = fuse_fs_init(); 1379 if (res) 1380 goto err; 1381 1382 res = fuse_dev_init(); 1383 if (res) 1384 goto err_fs_cleanup; 1385 1386 res = fuse_sysfs_init(); 1387 if (res) 1388 goto err_dev_cleanup; 1389 1390 res = fuse_ctl_init(); 1391 if (res) 1392 goto err_sysfs_cleanup; 1393 1394 sanitize_global_limit(&max_user_bgreq); 1395 sanitize_global_limit(&max_user_congthresh); 1396 1397 return 0; 1398 1399 err_sysfs_cleanup: 1400 fuse_sysfs_cleanup(); 1401 err_dev_cleanup: 1402 fuse_dev_cleanup(); 1403 err_fs_cleanup: 1404 fuse_fs_cleanup(); 1405 err: 1406 return res; 1407 } 1408 1409 static void __exit fuse_exit(void) 1410 { 1411 printk(KERN_DEBUG "fuse exit\n"); 1412 1413 fuse_ctl_cleanup(); 1414 fuse_sysfs_cleanup(); 1415 fuse_fs_cleanup(); 1416 fuse_dev_cleanup(); 1417 } 1418 1419 module_init(fuse_init); 1420 module_exit(fuse_exit); 1421