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