1 /* 2 FUSE: Filesystem in Userspace 3 Copyright (C) 2001-2006 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/parser.h> 18 #include <linux/statfs.h> 19 #include <linux/random.h> 20 #include <linux/sched.h> 21 22 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); 23 MODULE_DESCRIPTION("Filesystem in Userspace"); 24 MODULE_LICENSE("GPL"); 25 26 static struct kmem_cache *fuse_inode_cachep; 27 struct list_head fuse_conn_list; 28 DEFINE_MUTEX(fuse_mutex); 29 30 #define FUSE_SUPER_MAGIC 0x65735546 31 32 struct fuse_mount_data { 33 int fd; 34 unsigned rootmode; 35 unsigned user_id; 36 unsigned group_id; 37 unsigned fd_present : 1; 38 unsigned rootmode_present : 1; 39 unsigned user_id_present : 1; 40 unsigned group_id_present : 1; 41 unsigned flags; 42 unsigned max_read; 43 unsigned blksize; 44 }; 45 46 static struct inode *fuse_alloc_inode(struct super_block *sb) 47 { 48 struct inode *inode; 49 struct fuse_inode *fi; 50 51 inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL); 52 if (!inode) 53 return NULL; 54 55 fi = get_fuse_inode(inode); 56 fi->i_time = 0; 57 fi->nodeid = 0; 58 fi->nlookup = 0; 59 fi->attr_version = 0; 60 INIT_LIST_HEAD(&fi->write_files); 61 fi->forget_req = fuse_request_alloc(); 62 if (!fi->forget_req) { 63 kmem_cache_free(fuse_inode_cachep, inode); 64 return NULL; 65 } 66 67 return inode; 68 } 69 70 static void fuse_destroy_inode(struct inode *inode) 71 { 72 struct fuse_inode *fi = get_fuse_inode(inode); 73 BUG_ON(!list_empty(&fi->write_files)); 74 if (fi->forget_req) 75 fuse_request_free(fi->forget_req); 76 kmem_cache_free(fuse_inode_cachep, inode); 77 } 78 79 static void fuse_read_inode(struct inode *inode) 80 { 81 /* No op */ 82 } 83 84 void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, 85 unsigned long nodeid, u64 nlookup) 86 { 87 struct fuse_forget_in *inarg = &req->misc.forget_in; 88 inarg->nlookup = nlookup; 89 req->in.h.opcode = FUSE_FORGET; 90 req->in.h.nodeid = nodeid; 91 req->in.numargs = 1; 92 req->in.args[0].size = sizeof(struct fuse_forget_in); 93 req->in.args[0].value = inarg; 94 request_send_noreply(fc, req); 95 } 96 97 static void fuse_clear_inode(struct inode *inode) 98 { 99 if (inode->i_sb->s_flags & MS_ACTIVE) { 100 struct fuse_conn *fc = get_fuse_conn(inode); 101 struct fuse_inode *fi = get_fuse_inode(inode); 102 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); 103 fi->forget_req = NULL; 104 } 105 } 106 107 static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) 108 { 109 if (*flags & MS_MANDLOCK) 110 return -EINVAL; 111 112 return 0; 113 } 114 115 static void fuse_truncate(struct address_space *mapping, loff_t offset) 116 { 117 /* See vmtruncate() */ 118 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); 119 truncate_inode_pages(mapping, offset); 120 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); 121 } 122 123 124 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, 125 u64 attr_valid, u64 attr_version) 126 { 127 struct fuse_conn *fc = get_fuse_conn(inode); 128 struct fuse_inode *fi = get_fuse_inode(inode); 129 loff_t oldsize; 130 131 spin_lock(&fc->lock); 132 if (attr_version != 0 && fi->attr_version > attr_version) { 133 spin_unlock(&fc->lock); 134 return; 135 } 136 fi->attr_version = ++fc->attr_version; 137 fi->i_time = attr_valid; 138 139 inode->i_ino = attr->ino; 140 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); 141 inode->i_nlink = attr->nlink; 142 inode->i_uid = attr->uid; 143 inode->i_gid = attr->gid; 144 inode->i_blocks = attr->blocks; 145 inode->i_atime.tv_sec = attr->atime; 146 inode->i_atime.tv_nsec = attr->atimensec; 147 inode->i_mtime.tv_sec = attr->mtime; 148 inode->i_mtime.tv_nsec = attr->mtimensec; 149 inode->i_ctime.tv_sec = attr->ctime; 150 inode->i_ctime.tv_nsec = attr->ctimensec; 151 152 if (attr->blksize != 0) 153 inode->i_blkbits = ilog2(attr->blksize); 154 else 155 inode->i_blkbits = inode->i_sb->s_blocksize_bits; 156 157 /* 158 * Don't set the sticky bit in i_mode, unless we want the VFS 159 * to check permissions. This prevents failures due to the 160 * check in may_delete(). 161 */ 162 fi->orig_i_mode = inode->i_mode; 163 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) 164 inode->i_mode &= ~S_ISVTX; 165 166 oldsize = inode->i_size; 167 i_size_write(inode, attr->size); 168 spin_unlock(&fc->lock); 169 170 if (S_ISREG(inode->i_mode) && oldsize != attr->size) { 171 if (attr->size < oldsize) 172 fuse_truncate(inode->i_mapping, attr->size); 173 invalidate_inode_pages2(inode->i_mapping); 174 } 175 } 176 177 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) 178 { 179 inode->i_mode = attr->mode & S_IFMT; 180 inode->i_size = attr->size; 181 if (S_ISREG(inode->i_mode)) { 182 fuse_init_common(inode); 183 fuse_init_file_inode(inode); 184 } else if (S_ISDIR(inode->i_mode)) 185 fuse_init_dir(inode); 186 else if (S_ISLNK(inode->i_mode)) 187 fuse_init_symlink(inode); 188 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || 189 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { 190 fuse_init_common(inode); 191 init_special_inode(inode, inode->i_mode, 192 new_decode_dev(attr->rdev)); 193 } else 194 BUG(); 195 } 196 197 static int fuse_inode_eq(struct inode *inode, void *_nodeidp) 198 { 199 unsigned long nodeid = *(unsigned long *) _nodeidp; 200 if (get_node_id(inode) == nodeid) 201 return 1; 202 else 203 return 0; 204 } 205 206 static int fuse_inode_set(struct inode *inode, void *_nodeidp) 207 { 208 unsigned long nodeid = *(unsigned long *) _nodeidp; 209 get_fuse_inode(inode)->nodeid = nodeid; 210 return 0; 211 } 212 213 struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, 214 int generation, struct fuse_attr *attr, 215 u64 attr_valid, u64 attr_version) 216 { 217 struct inode *inode; 218 struct fuse_inode *fi; 219 struct fuse_conn *fc = get_fuse_conn_super(sb); 220 221 retry: 222 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); 223 if (!inode) 224 return NULL; 225 226 if ((inode->i_state & I_NEW)) { 227 inode->i_flags |= S_NOATIME|S_NOCMTIME; 228 inode->i_generation = generation; 229 inode->i_data.backing_dev_info = &fc->bdi; 230 fuse_init_inode(inode, attr); 231 unlock_new_inode(inode); 232 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { 233 /* Inode has changed type, any I/O on the old should fail */ 234 make_bad_inode(inode); 235 iput(inode); 236 goto retry; 237 } 238 239 fi = get_fuse_inode(inode); 240 spin_lock(&fc->lock); 241 fi->nlookup ++; 242 spin_unlock(&fc->lock); 243 fuse_change_attributes(inode, attr, attr_valid, attr_version); 244 245 return inode; 246 } 247 248 static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags) 249 { 250 if (flags & MNT_FORCE) 251 fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb)); 252 } 253 254 static void fuse_send_destroy(struct fuse_conn *fc) 255 { 256 struct fuse_req *req = fc->destroy_req; 257 if (req && fc->conn_init) { 258 fc->destroy_req = NULL; 259 req->in.h.opcode = FUSE_DESTROY; 260 req->force = 1; 261 request_send(fc, req); 262 fuse_put_request(fc, req); 263 } 264 } 265 266 static void fuse_put_super(struct super_block *sb) 267 { 268 struct fuse_conn *fc = get_fuse_conn_super(sb); 269 270 fuse_send_destroy(fc); 271 spin_lock(&fc->lock); 272 fc->connected = 0; 273 fc->blocked = 0; 274 spin_unlock(&fc->lock); 275 /* Flush all readers on this fs */ 276 kill_fasync(&fc->fasync, SIGIO, POLL_IN); 277 wake_up_all(&fc->waitq); 278 wake_up_all(&fc->blocked_waitq); 279 wake_up_all(&fc->reserved_req_waitq); 280 mutex_lock(&fuse_mutex); 281 list_del(&fc->entry); 282 fuse_ctl_remove_conn(fc); 283 mutex_unlock(&fuse_mutex); 284 fuse_conn_put(fc); 285 } 286 287 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) 288 { 289 stbuf->f_type = FUSE_SUPER_MAGIC; 290 stbuf->f_bsize = attr->bsize; 291 stbuf->f_frsize = attr->frsize; 292 stbuf->f_blocks = attr->blocks; 293 stbuf->f_bfree = attr->bfree; 294 stbuf->f_bavail = attr->bavail; 295 stbuf->f_files = attr->files; 296 stbuf->f_ffree = attr->ffree; 297 stbuf->f_namelen = attr->namelen; 298 /* fsid is left zero */ 299 } 300 301 static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) 302 { 303 struct super_block *sb = dentry->d_sb; 304 struct fuse_conn *fc = get_fuse_conn_super(sb); 305 struct fuse_req *req; 306 struct fuse_statfs_out outarg; 307 int err; 308 309 if (!fuse_allow_task(fc, current)) { 310 buf->f_type = FUSE_SUPER_MAGIC; 311 return 0; 312 } 313 314 req = fuse_get_req(fc); 315 if (IS_ERR(req)) 316 return PTR_ERR(req); 317 318 memset(&outarg, 0, sizeof(outarg)); 319 req->in.numargs = 0; 320 req->in.h.opcode = FUSE_STATFS; 321 req->in.h.nodeid = get_node_id(dentry->d_inode); 322 req->out.numargs = 1; 323 req->out.args[0].size = 324 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); 325 req->out.args[0].value = &outarg; 326 request_send(fc, req); 327 err = req->out.h.error; 328 if (!err) 329 convert_fuse_statfs(buf, &outarg.st); 330 fuse_put_request(fc, req); 331 return err; 332 } 333 334 enum { 335 OPT_FD, 336 OPT_ROOTMODE, 337 OPT_USER_ID, 338 OPT_GROUP_ID, 339 OPT_DEFAULT_PERMISSIONS, 340 OPT_ALLOW_OTHER, 341 OPT_MAX_READ, 342 OPT_BLKSIZE, 343 OPT_ERR 344 }; 345 346 static match_table_t tokens = { 347 {OPT_FD, "fd=%u"}, 348 {OPT_ROOTMODE, "rootmode=%o"}, 349 {OPT_USER_ID, "user_id=%u"}, 350 {OPT_GROUP_ID, "group_id=%u"}, 351 {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, 352 {OPT_ALLOW_OTHER, "allow_other"}, 353 {OPT_MAX_READ, "max_read=%u"}, 354 {OPT_BLKSIZE, "blksize=%u"}, 355 {OPT_ERR, NULL} 356 }; 357 358 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) 359 { 360 char *p; 361 memset(d, 0, sizeof(struct fuse_mount_data)); 362 d->max_read = ~0; 363 d->blksize = 512; 364 365 while ((p = strsep(&opt, ",")) != NULL) { 366 int token; 367 int value; 368 substring_t args[MAX_OPT_ARGS]; 369 if (!*p) 370 continue; 371 372 token = match_token(p, tokens, args); 373 switch (token) { 374 case OPT_FD: 375 if (match_int(&args[0], &value)) 376 return 0; 377 d->fd = value; 378 d->fd_present = 1; 379 break; 380 381 case OPT_ROOTMODE: 382 if (match_octal(&args[0], &value)) 383 return 0; 384 if (!fuse_valid_type(value)) 385 return 0; 386 d->rootmode = value; 387 d->rootmode_present = 1; 388 break; 389 390 case OPT_USER_ID: 391 if (match_int(&args[0], &value)) 392 return 0; 393 d->user_id = value; 394 d->user_id_present = 1; 395 break; 396 397 case OPT_GROUP_ID: 398 if (match_int(&args[0], &value)) 399 return 0; 400 d->group_id = value; 401 d->group_id_present = 1; 402 break; 403 404 case OPT_DEFAULT_PERMISSIONS: 405 d->flags |= FUSE_DEFAULT_PERMISSIONS; 406 break; 407 408 case OPT_ALLOW_OTHER: 409 d->flags |= FUSE_ALLOW_OTHER; 410 break; 411 412 case OPT_MAX_READ: 413 if (match_int(&args[0], &value)) 414 return 0; 415 d->max_read = value; 416 break; 417 418 case OPT_BLKSIZE: 419 if (!is_bdev || match_int(&args[0], &value)) 420 return 0; 421 d->blksize = value; 422 break; 423 424 default: 425 return 0; 426 } 427 } 428 429 if (!d->fd_present || !d->rootmode_present || 430 !d->user_id_present || !d->group_id_present) 431 return 0; 432 433 return 1; 434 } 435 436 static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) 437 { 438 struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); 439 440 seq_printf(m, ",user_id=%u", fc->user_id); 441 seq_printf(m, ",group_id=%u", fc->group_id); 442 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) 443 seq_puts(m, ",default_permissions"); 444 if (fc->flags & FUSE_ALLOW_OTHER) 445 seq_puts(m, ",allow_other"); 446 if (fc->max_read != ~0) 447 seq_printf(m, ",max_read=%u", fc->max_read); 448 return 0; 449 } 450 451 static struct fuse_conn *new_conn(void) 452 { 453 struct fuse_conn *fc; 454 int err; 455 456 fc = kzalloc(sizeof(*fc), GFP_KERNEL); 457 if (fc) { 458 spin_lock_init(&fc->lock); 459 mutex_init(&fc->inst_mutex); 460 atomic_set(&fc->count, 1); 461 init_waitqueue_head(&fc->waitq); 462 init_waitqueue_head(&fc->blocked_waitq); 463 init_waitqueue_head(&fc->reserved_req_waitq); 464 INIT_LIST_HEAD(&fc->pending); 465 INIT_LIST_HEAD(&fc->processing); 466 INIT_LIST_HEAD(&fc->io); 467 INIT_LIST_HEAD(&fc->interrupts); 468 atomic_set(&fc->num_waiting, 0); 469 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; 470 fc->bdi.unplug_io_fn = default_unplug_io_fn; 471 err = bdi_init(&fc->bdi); 472 if (err) { 473 kfree(fc); 474 fc = NULL; 475 goto out; 476 } 477 fc->reqctr = 0; 478 fc->blocked = 1; 479 fc->attr_version = 1; 480 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); 481 } 482 out: 483 return fc; 484 } 485 486 void fuse_conn_put(struct fuse_conn *fc) 487 { 488 if (atomic_dec_and_test(&fc->count)) { 489 if (fc->destroy_req) 490 fuse_request_free(fc->destroy_req); 491 mutex_destroy(&fc->inst_mutex); 492 bdi_destroy(&fc->bdi); 493 kfree(fc); 494 } 495 } 496 497 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) 498 { 499 atomic_inc(&fc->count); 500 return fc; 501 } 502 503 static struct inode *get_root_inode(struct super_block *sb, unsigned mode) 504 { 505 struct fuse_attr attr; 506 memset(&attr, 0, sizeof(attr)); 507 508 attr.mode = mode; 509 attr.ino = FUSE_ROOT_ID; 510 attr.nlink = 1; 511 return fuse_iget(sb, 1, 0, &attr, 0, 0); 512 } 513 514 static const struct super_operations fuse_super_operations = { 515 .alloc_inode = fuse_alloc_inode, 516 .destroy_inode = fuse_destroy_inode, 517 .read_inode = fuse_read_inode, 518 .clear_inode = fuse_clear_inode, 519 .drop_inode = generic_delete_inode, 520 .remount_fs = fuse_remount_fs, 521 .put_super = fuse_put_super, 522 .umount_begin = fuse_umount_begin, 523 .statfs = fuse_statfs, 524 .show_options = fuse_show_options, 525 }; 526 527 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 528 { 529 struct fuse_init_out *arg = &req->misc.init_out; 530 531 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) 532 fc->conn_error = 1; 533 else { 534 unsigned long ra_pages; 535 536 if (arg->minor >= 6) { 537 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; 538 if (arg->flags & FUSE_ASYNC_READ) 539 fc->async_read = 1; 540 if (!(arg->flags & FUSE_POSIX_LOCKS)) 541 fc->no_lock = 1; 542 if (arg->flags & FUSE_ATOMIC_O_TRUNC) 543 fc->atomic_o_trunc = 1; 544 } else { 545 ra_pages = fc->max_read / PAGE_CACHE_SIZE; 546 fc->no_lock = 1; 547 } 548 549 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); 550 fc->minor = arg->minor; 551 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; 552 fc->conn_init = 1; 553 } 554 fuse_put_request(fc, req); 555 fc->blocked = 0; 556 wake_up_all(&fc->blocked_waitq); 557 } 558 559 static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) 560 { 561 struct fuse_init_in *arg = &req->misc.init_in; 562 563 arg->major = FUSE_KERNEL_VERSION; 564 arg->minor = FUSE_KERNEL_MINOR_VERSION; 565 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; 566 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC; 567 req->in.h.opcode = FUSE_INIT; 568 req->in.numargs = 1; 569 req->in.args[0].size = sizeof(*arg); 570 req->in.args[0].value = arg; 571 req->out.numargs = 1; 572 /* Variable length arguement used for backward compatibility 573 with interface version < 7.5. Rest of init_out is zeroed 574 by do_get_request(), so a short reply is not a problem */ 575 req->out.argvar = 1; 576 req->out.args[0].size = sizeof(struct fuse_init_out); 577 req->out.args[0].value = &req->misc.init_out; 578 req->end = process_init_reply; 579 request_send_background(fc, req); 580 } 581 582 static u64 conn_id(void) 583 { 584 static u64 ctr = 1; 585 return ctr++; 586 } 587 588 static int fuse_fill_super(struct super_block *sb, void *data, int silent) 589 { 590 struct fuse_conn *fc; 591 struct inode *root; 592 struct fuse_mount_data d; 593 struct file *file; 594 struct dentry *root_dentry; 595 struct fuse_req *init_req; 596 int err; 597 int is_bdev = sb->s_bdev != NULL; 598 599 if (sb->s_flags & MS_MANDLOCK) 600 return -EINVAL; 601 602 if (!parse_fuse_opt((char *) data, &d, is_bdev)) 603 return -EINVAL; 604 605 if (is_bdev) { 606 #ifdef CONFIG_BLOCK 607 if (!sb_set_blocksize(sb, d.blksize)) 608 return -EINVAL; 609 #endif 610 } else { 611 sb->s_blocksize = PAGE_CACHE_SIZE; 612 sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 613 } 614 sb->s_magic = FUSE_SUPER_MAGIC; 615 sb->s_op = &fuse_super_operations; 616 sb->s_maxbytes = MAX_LFS_FILESIZE; 617 618 file = fget(d.fd); 619 if (!file) 620 return -EINVAL; 621 622 if (file->f_op != &fuse_dev_operations) 623 return -EINVAL; 624 625 fc = new_conn(); 626 if (!fc) 627 return -ENOMEM; 628 629 fc->flags = d.flags; 630 fc->user_id = d.user_id; 631 fc->group_id = d.group_id; 632 fc->max_read = d.max_read; 633 634 /* Used by get_root_inode() */ 635 sb->s_fs_info = fc; 636 637 err = -ENOMEM; 638 root = get_root_inode(sb, d.rootmode); 639 if (!root) 640 goto err; 641 642 root_dentry = d_alloc_root(root); 643 if (!root_dentry) { 644 iput(root); 645 goto err; 646 } 647 648 init_req = fuse_request_alloc(); 649 if (!init_req) 650 goto err_put_root; 651 652 if (is_bdev) { 653 fc->destroy_req = fuse_request_alloc(); 654 if (!fc->destroy_req) 655 goto err_put_root; 656 } 657 658 mutex_lock(&fuse_mutex); 659 err = -EINVAL; 660 if (file->private_data) 661 goto err_unlock; 662 663 fc->id = conn_id(); 664 err = fuse_ctl_add_conn(fc); 665 if (err) 666 goto err_unlock; 667 668 list_add_tail(&fc->entry, &fuse_conn_list); 669 sb->s_root = root_dentry; 670 fc->connected = 1; 671 file->private_data = fuse_conn_get(fc); 672 mutex_unlock(&fuse_mutex); 673 /* 674 * atomic_dec_and_test() in fput() provides the necessary 675 * memory barrier for file->private_data to be visible on all 676 * CPUs after this 677 */ 678 fput(file); 679 680 fuse_send_init(fc, init_req); 681 682 return 0; 683 684 err_unlock: 685 mutex_unlock(&fuse_mutex); 686 fuse_request_free(init_req); 687 err_put_root: 688 dput(root_dentry); 689 err: 690 fput(file); 691 fuse_conn_put(fc); 692 return err; 693 } 694 695 static int fuse_get_sb(struct file_system_type *fs_type, 696 int flags, const char *dev_name, 697 void *raw_data, struct vfsmount *mnt) 698 { 699 return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt); 700 } 701 702 static struct file_system_type fuse_fs_type = { 703 .owner = THIS_MODULE, 704 .name = "fuse", 705 .fs_flags = FS_HAS_SUBTYPE, 706 .get_sb = fuse_get_sb, 707 .kill_sb = kill_anon_super, 708 }; 709 710 #ifdef CONFIG_BLOCK 711 static int fuse_get_sb_blk(struct file_system_type *fs_type, 712 int flags, const char *dev_name, 713 void *raw_data, struct vfsmount *mnt) 714 { 715 return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super, 716 mnt); 717 } 718 719 static struct file_system_type fuseblk_fs_type = { 720 .owner = THIS_MODULE, 721 .name = "fuseblk", 722 .get_sb = fuse_get_sb_blk, 723 .kill_sb = kill_block_super, 724 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE, 725 }; 726 727 static inline int register_fuseblk(void) 728 { 729 return register_filesystem(&fuseblk_fs_type); 730 } 731 732 static inline void unregister_fuseblk(void) 733 { 734 unregister_filesystem(&fuseblk_fs_type); 735 } 736 #else 737 static inline int register_fuseblk(void) 738 { 739 return 0; 740 } 741 742 static inline void unregister_fuseblk(void) 743 { 744 } 745 #endif 746 747 static void fuse_inode_init_once(struct kmem_cache *cachep, void *foo) 748 { 749 struct inode * inode = foo; 750 751 inode_init_once(inode); 752 } 753 754 static int __init fuse_fs_init(void) 755 { 756 int err; 757 758 err = register_filesystem(&fuse_fs_type); 759 if (err) 760 goto out; 761 762 err = register_fuseblk(); 763 if (err) 764 goto out_unreg; 765 766 fuse_inode_cachep = kmem_cache_create("fuse_inode", 767 sizeof(struct fuse_inode), 768 0, SLAB_HWCACHE_ALIGN, 769 fuse_inode_init_once); 770 err = -ENOMEM; 771 if (!fuse_inode_cachep) 772 goto out_unreg2; 773 774 return 0; 775 776 out_unreg2: 777 unregister_fuseblk(); 778 out_unreg: 779 unregister_filesystem(&fuse_fs_type); 780 out: 781 return err; 782 } 783 784 static void fuse_fs_cleanup(void) 785 { 786 unregister_filesystem(&fuse_fs_type); 787 unregister_fuseblk(); 788 kmem_cache_destroy(fuse_inode_cachep); 789 } 790 791 static struct kobject *fuse_kobj; 792 static struct kobject *connections_kobj; 793 794 static int fuse_sysfs_init(void) 795 { 796 int err; 797 798 fuse_kobj = kobject_create_and_add("fuse", fs_kobj); 799 if (!fuse_kobj) { 800 err = -ENOMEM; 801 goto out_err; 802 } 803 804 connections_kobj = kobject_create_and_add("connections", fuse_kobj); 805 if (!connections_kobj) { 806 err = -ENOMEM; 807 goto out_fuse_unregister; 808 } 809 810 return 0; 811 812 out_fuse_unregister: 813 kobject_put(fuse_kobj); 814 out_err: 815 return err; 816 } 817 818 static void fuse_sysfs_cleanup(void) 819 { 820 kobject_put(connections_kobj); 821 kobject_put(fuse_kobj); 822 } 823 824 static int __init fuse_init(void) 825 { 826 int res; 827 828 printk("fuse init (API version %i.%i)\n", 829 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); 830 831 INIT_LIST_HEAD(&fuse_conn_list); 832 res = fuse_fs_init(); 833 if (res) 834 goto err; 835 836 res = fuse_dev_init(); 837 if (res) 838 goto err_fs_cleanup; 839 840 res = fuse_sysfs_init(); 841 if (res) 842 goto err_dev_cleanup; 843 844 res = fuse_ctl_init(); 845 if (res) 846 goto err_sysfs_cleanup; 847 848 return 0; 849 850 err_sysfs_cleanup: 851 fuse_sysfs_cleanup(); 852 err_dev_cleanup: 853 fuse_dev_cleanup(); 854 err_fs_cleanup: 855 fuse_fs_cleanup(); 856 err: 857 return res; 858 } 859 860 static void __exit fuse_exit(void) 861 { 862 printk(KERN_DEBUG "fuse exit\n"); 863 864 fuse_ctl_cleanup(); 865 fuse_sysfs_cleanup(); 866 fuse_fs_cleanup(); 867 fuse_dev_cleanup(); 868 } 869 870 module_init(fuse_init); 871 module_exit(fuse_exit); 872