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 INIT_LIST_HEAD(&fi->write_files); 60 fi->forget_req = fuse_request_alloc(); 61 if (!fi->forget_req) { 62 kmem_cache_free(fuse_inode_cachep, inode); 63 return NULL; 64 } 65 66 return inode; 67 } 68 69 static void fuse_destroy_inode(struct inode *inode) 70 { 71 struct fuse_inode *fi = get_fuse_inode(inode); 72 BUG_ON(!list_empty(&fi->write_files)); 73 if (fi->forget_req) 74 fuse_request_free(fi->forget_req); 75 kmem_cache_free(fuse_inode_cachep, inode); 76 } 77 78 static void fuse_read_inode(struct inode *inode) 79 { 80 /* No op */ 81 } 82 83 void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, 84 unsigned long nodeid, u64 nlookup) 85 { 86 struct fuse_forget_in *inarg = &req->misc.forget_in; 87 inarg->nlookup = nlookup; 88 req->in.h.opcode = FUSE_FORGET; 89 req->in.h.nodeid = nodeid; 90 req->in.numargs = 1; 91 req->in.args[0].size = sizeof(struct fuse_forget_in); 92 req->in.args[0].value = inarg; 93 request_send_noreply(fc, req); 94 } 95 96 static void fuse_clear_inode(struct inode *inode) 97 { 98 if (inode->i_sb->s_flags & MS_ACTIVE) { 99 struct fuse_conn *fc = get_fuse_conn(inode); 100 struct fuse_inode *fi = get_fuse_inode(inode); 101 fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); 102 fi->forget_req = NULL; 103 } 104 } 105 106 static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) 107 { 108 if (*flags & MS_MANDLOCK) 109 return -EINVAL; 110 111 return 0; 112 } 113 114 static void fuse_truncate(struct address_space *mapping, loff_t offset) 115 { 116 /* See vmtruncate() */ 117 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); 118 truncate_inode_pages(mapping, offset); 119 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1); 120 } 121 122 123 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, 124 u64 attr_valid, u64 attr_version) 125 { 126 struct fuse_conn *fc = get_fuse_conn(inode); 127 struct fuse_inode *fi = get_fuse_inode(inode); 128 loff_t oldsize; 129 130 spin_lock(&fc->lock); 131 if (attr_version != 0 && fi->attr_version > attr_version) { 132 spin_unlock(&fc->lock); 133 return; 134 } 135 fi->attr_version = ++fc->attr_version; 136 fi->i_time = attr_valid; 137 138 inode->i_ino = attr->ino; 139 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); 140 inode->i_nlink = attr->nlink; 141 inode->i_uid = attr->uid; 142 inode->i_gid = attr->gid; 143 inode->i_blocks = attr->blocks; 144 inode->i_atime.tv_sec = attr->atime; 145 inode->i_atime.tv_nsec = attr->atimensec; 146 inode->i_mtime.tv_sec = attr->mtime; 147 inode->i_mtime.tv_nsec = attr->mtimensec; 148 inode->i_ctime.tv_sec = attr->ctime; 149 inode->i_ctime.tv_nsec = attr->ctimensec; 150 151 if (attr->blksize != 0) 152 inode->i_blkbits = ilog2(attr->blksize); 153 else 154 inode->i_blkbits = inode->i_sb->s_blocksize_bits; 155 156 /* 157 * Don't set the sticky bit in i_mode, unless we want the VFS 158 * to check permissions. This prevents failures due to the 159 * check in may_delete(). 160 */ 161 fi->orig_i_mode = inode->i_mode; 162 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) 163 inode->i_mode &= ~S_ISVTX; 164 165 oldsize = inode->i_size; 166 i_size_write(inode, attr->size); 167 spin_unlock(&fc->lock); 168 169 if (S_ISREG(inode->i_mode) && oldsize != attr->size) { 170 if (attr->size < oldsize) 171 fuse_truncate(inode->i_mapping, attr->size); 172 invalidate_inode_pages2(inode->i_mapping); 173 } 174 } 175 176 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) 177 { 178 inode->i_mode = attr->mode & S_IFMT; 179 inode->i_size = attr->size; 180 if (S_ISREG(inode->i_mode)) { 181 fuse_init_common(inode); 182 fuse_init_file_inode(inode); 183 } else if (S_ISDIR(inode->i_mode)) 184 fuse_init_dir(inode); 185 else if (S_ISLNK(inode->i_mode)) 186 fuse_init_symlink(inode); 187 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || 188 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { 189 fuse_init_common(inode); 190 init_special_inode(inode, inode->i_mode, 191 new_decode_dev(attr->rdev)); 192 } else 193 BUG(); 194 } 195 196 static int fuse_inode_eq(struct inode *inode, void *_nodeidp) 197 { 198 unsigned long nodeid = *(unsigned long *) _nodeidp; 199 if (get_node_id(inode) == nodeid) 200 return 1; 201 else 202 return 0; 203 } 204 205 static int fuse_inode_set(struct inode *inode, void *_nodeidp) 206 { 207 unsigned long nodeid = *(unsigned long *) _nodeidp; 208 get_fuse_inode(inode)->nodeid = nodeid; 209 return 0; 210 } 211 212 struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, 213 int generation, struct fuse_attr *attr, 214 u64 attr_valid, u64 attr_version) 215 { 216 struct inode *inode; 217 struct fuse_inode *fi; 218 struct fuse_conn *fc = get_fuse_conn_super(sb); 219 220 retry: 221 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); 222 if (!inode) 223 return NULL; 224 225 if ((inode->i_state & I_NEW)) { 226 inode->i_flags |= S_NOATIME|S_NOCMTIME; 227 inode->i_generation = generation; 228 inode->i_data.backing_dev_info = &fc->bdi; 229 fuse_init_inode(inode, attr); 230 unlock_new_inode(inode); 231 } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { 232 /* Inode has changed type, any I/O on the old should fail */ 233 make_bad_inode(inode); 234 iput(inode); 235 goto retry; 236 } 237 238 fi = get_fuse_inode(inode); 239 spin_lock(&fc->lock); 240 fi->nlookup ++; 241 spin_unlock(&fc->lock); 242 fuse_change_attributes(inode, attr, attr_valid, attr_version); 243 244 return inode; 245 } 246 247 static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags) 248 { 249 if (flags & MNT_FORCE) 250 fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb)); 251 } 252 253 static void fuse_send_destroy(struct fuse_conn *fc) 254 { 255 struct fuse_req *req = fc->destroy_req; 256 if (req && fc->conn_init) { 257 fc->destroy_req = NULL; 258 req->in.h.opcode = FUSE_DESTROY; 259 req->force = 1; 260 request_send(fc, req); 261 fuse_put_request(fc, req); 262 } 263 } 264 265 static void fuse_put_super(struct super_block *sb) 266 { 267 struct fuse_conn *fc = get_fuse_conn_super(sb); 268 269 fuse_send_destroy(fc); 270 spin_lock(&fc->lock); 271 fc->connected = 0; 272 fc->blocked = 0; 273 spin_unlock(&fc->lock); 274 /* Flush all readers on this fs */ 275 kill_fasync(&fc->fasync, SIGIO, POLL_IN); 276 wake_up_all(&fc->waitq); 277 wake_up_all(&fc->blocked_waitq); 278 wake_up_all(&fc->reserved_req_waitq); 279 mutex_lock(&fuse_mutex); 280 list_del(&fc->entry); 281 fuse_ctl_remove_conn(fc); 282 mutex_unlock(&fuse_mutex); 283 fuse_conn_put(fc); 284 } 285 286 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) 287 { 288 stbuf->f_type = FUSE_SUPER_MAGIC; 289 stbuf->f_bsize = attr->bsize; 290 stbuf->f_frsize = attr->frsize; 291 stbuf->f_blocks = attr->blocks; 292 stbuf->f_bfree = attr->bfree; 293 stbuf->f_bavail = attr->bavail; 294 stbuf->f_files = attr->files; 295 stbuf->f_ffree = attr->ffree; 296 stbuf->f_namelen = attr->namelen; 297 /* fsid is left zero */ 298 } 299 300 static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) 301 { 302 struct super_block *sb = dentry->d_sb; 303 struct fuse_conn *fc = get_fuse_conn_super(sb); 304 struct fuse_req *req; 305 struct fuse_statfs_out outarg; 306 int err; 307 308 if (!fuse_allow_task(fc, current)) { 309 buf->f_type = FUSE_SUPER_MAGIC; 310 return 0; 311 } 312 313 req = fuse_get_req(fc); 314 if (IS_ERR(req)) 315 return PTR_ERR(req); 316 317 memset(&outarg, 0, sizeof(outarg)); 318 req->in.numargs = 0; 319 req->in.h.opcode = FUSE_STATFS; 320 req->in.h.nodeid = get_node_id(dentry->d_inode); 321 req->out.numargs = 1; 322 req->out.args[0].size = 323 fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); 324 req->out.args[0].value = &outarg; 325 request_send(fc, req); 326 err = req->out.h.error; 327 if (!err) 328 convert_fuse_statfs(buf, &outarg.st); 329 fuse_put_request(fc, req); 330 return err; 331 } 332 333 enum { 334 OPT_FD, 335 OPT_ROOTMODE, 336 OPT_USER_ID, 337 OPT_GROUP_ID, 338 OPT_DEFAULT_PERMISSIONS, 339 OPT_ALLOW_OTHER, 340 OPT_MAX_READ, 341 OPT_BLKSIZE, 342 OPT_ERR 343 }; 344 345 static match_table_t tokens = { 346 {OPT_FD, "fd=%u"}, 347 {OPT_ROOTMODE, "rootmode=%o"}, 348 {OPT_USER_ID, "user_id=%u"}, 349 {OPT_GROUP_ID, "group_id=%u"}, 350 {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, 351 {OPT_ALLOW_OTHER, "allow_other"}, 352 {OPT_MAX_READ, "max_read=%u"}, 353 {OPT_BLKSIZE, "blksize=%u"}, 354 {OPT_ERR, NULL} 355 }; 356 357 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) 358 { 359 char *p; 360 memset(d, 0, sizeof(struct fuse_mount_data)); 361 d->max_read = ~0; 362 d->blksize = 512; 363 364 while ((p = strsep(&opt, ",")) != NULL) { 365 int token; 366 int value; 367 substring_t args[MAX_OPT_ARGS]; 368 if (!*p) 369 continue; 370 371 token = match_token(p, tokens, args); 372 switch (token) { 373 case OPT_FD: 374 if (match_int(&args[0], &value)) 375 return 0; 376 d->fd = value; 377 d->fd_present = 1; 378 break; 379 380 case OPT_ROOTMODE: 381 if (match_octal(&args[0], &value)) 382 return 0; 383 if (!fuse_valid_type(value)) 384 return 0; 385 d->rootmode = value; 386 d->rootmode_present = 1; 387 break; 388 389 case OPT_USER_ID: 390 if (match_int(&args[0], &value)) 391 return 0; 392 d->user_id = value; 393 d->user_id_present = 1; 394 break; 395 396 case OPT_GROUP_ID: 397 if (match_int(&args[0], &value)) 398 return 0; 399 d->group_id = value; 400 d->group_id_present = 1; 401 break; 402 403 case OPT_DEFAULT_PERMISSIONS: 404 d->flags |= FUSE_DEFAULT_PERMISSIONS; 405 break; 406 407 case OPT_ALLOW_OTHER: 408 d->flags |= FUSE_ALLOW_OTHER; 409 break; 410 411 case OPT_MAX_READ: 412 if (match_int(&args[0], &value)) 413 return 0; 414 d->max_read = value; 415 break; 416 417 case OPT_BLKSIZE: 418 if (!is_bdev || match_int(&args[0], &value)) 419 return 0; 420 d->blksize = value; 421 break; 422 423 default: 424 return 0; 425 } 426 } 427 428 if (!d->fd_present || !d->rootmode_present || 429 !d->user_id_present || !d->group_id_present) 430 return 0; 431 432 return 1; 433 } 434 435 static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) 436 { 437 struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); 438 439 seq_printf(m, ",user_id=%u", fc->user_id); 440 seq_printf(m, ",group_id=%u", fc->group_id); 441 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) 442 seq_puts(m, ",default_permissions"); 443 if (fc->flags & FUSE_ALLOW_OTHER) 444 seq_puts(m, ",allow_other"); 445 if (fc->max_read != ~0) 446 seq_printf(m, ",max_read=%u", fc->max_read); 447 return 0; 448 } 449 450 static struct fuse_conn *new_conn(void) 451 { 452 struct fuse_conn *fc; 453 int err; 454 455 fc = kzalloc(sizeof(*fc), GFP_KERNEL); 456 if (fc) { 457 spin_lock_init(&fc->lock); 458 mutex_init(&fc->inst_mutex); 459 atomic_set(&fc->count, 1); 460 init_waitqueue_head(&fc->waitq); 461 init_waitqueue_head(&fc->blocked_waitq); 462 init_waitqueue_head(&fc->reserved_req_waitq); 463 INIT_LIST_HEAD(&fc->pending); 464 INIT_LIST_HEAD(&fc->processing); 465 INIT_LIST_HEAD(&fc->io); 466 INIT_LIST_HEAD(&fc->interrupts); 467 atomic_set(&fc->num_waiting, 0); 468 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; 469 fc->bdi.unplug_io_fn = default_unplug_io_fn; 470 err = bdi_init(&fc->bdi); 471 if (err) { 472 kfree(fc); 473 fc = NULL; 474 goto out; 475 } 476 fc->reqctr = 0; 477 fc->blocked = 1; 478 fc->attr_version = 1; 479 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); 480 } 481 out: 482 return fc; 483 } 484 485 void fuse_conn_put(struct fuse_conn *fc) 486 { 487 if (atomic_dec_and_test(&fc->count)) { 488 if (fc->destroy_req) 489 fuse_request_free(fc->destroy_req); 490 mutex_destroy(&fc->inst_mutex); 491 bdi_destroy(&fc->bdi); 492 kfree(fc); 493 } 494 } 495 496 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) 497 { 498 atomic_inc(&fc->count); 499 return fc; 500 } 501 502 static struct inode *get_root_inode(struct super_block *sb, unsigned mode) 503 { 504 struct fuse_attr attr; 505 memset(&attr, 0, sizeof(attr)); 506 507 attr.mode = mode; 508 attr.ino = FUSE_ROOT_ID; 509 attr.nlink = 1; 510 return fuse_iget(sb, 1, 0, &attr, 0, 0); 511 } 512 513 static const struct super_operations fuse_super_operations = { 514 .alloc_inode = fuse_alloc_inode, 515 .destroy_inode = fuse_destroy_inode, 516 .read_inode = fuse_read_inode, 517 .clear_inode = fuse_clear_inode, 518 .drop_inode = generic_delete_inode, 519 .remount_fs = fuse_remount_fs, 520 .put_super = fuse_put_super, 521 .umount_begin = fuse_umount_begin, 522 .statfs = fuse_statfs, 523 .show_options = fuse_show_options, 524 }; 525 526 static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 527 { 528 struct fuse_init_out *arg = &req->misc.init_out; 529 530 if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) 531 fc->conn_error = 1; 532 else { 533 unsigned long ra_pages; 534 535 if (arg->minor >= 6) { 536 ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; 537 if (arg->flags & FUSE_ASYNC_READ) 538 fc->async_read = 1; 539 if (!(arg->flags & FUSE_POSIX_LOCKS)) 540 fc->no_lock = 1; 541 if (arg->flags & FUSE_ATOMIC_O_TRUNC) 542 fc->atomic_o_trunc = 1; 543 } else { 544 ra_pages = fc->max_read / PAGE_CACHE_SIZE; 545 fc->no_lock = 1; 546 } 547 548 fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); 549 fc->minor = arg->minor; 550 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; 551 fc->conn_init = 1; 552 } 553 fuse_put_request(fc, req); 554 fc->blocked = 0; 555 wake_up_all(&fc->blocked_waitq); 556 } 557 558 static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) 559 { 560 struct fuse_init_in *arg = &req->misc.init_in; 561 562 arg->major = FUSE_KERNEL_VERSION; 563 arg->minor = FUSE_KERNEL_MINOR_VERSION; 564 arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; 565 arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_FILE_OPS | 566 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 decl_subsys(fuse, NULL, NULL); 748 static decl_subsys(connections, NULL, NULL); 749 750 static void fuse_inode_init_once(struct kmem_cache *cachep, void *foo) 751 { 752 struct inode * inode = foo; 753 754 inode_init_once(inode); 755 } 756 757 static int __init fuse_fs_init(void) 758 { 759 int err; 760 761 err = register_filesystem(&fuse_fs_type); 762 if (err) 763 goto out; 764 765 err = register_fuseblk(); 766 if (err) 767 goto out_unreg; 768 769 fuse_inode_cachep = kmem_cache_create("fuse_inode", 770 sizeof(struct fuse_inode), 771 0, SLAB_HWCACHE_ALIGN, 772 fuse_inode_init_once); 773 err = -ENOMEM; 774 if (!fuse_inode_cachep) 775 goto out_unreg2; 776 777 return 0; 778 779 out_unreg2: 780 unregister_fuseblk(); 781 out_unreg: 782 unregister_filesystem(&fuse_fs_type); 783 out: 784 return err; 785 } 786 787 static void fuse_fs_cleanup(void) 788 { 789 unregister_filesystem(&fuse_fs_type); 790 unregister_fuseblk(); 791 kmem_cache_destroy(fuse_inode_cachep); 792 } 793 794 static int fuse_sysfs_init(void) 795 { 796 int err; 797 798 kobj_set_kset_s(&fuse_subsys, fs_subsys); 799 err = subsystem_register(&fuse_subsys); 800 if (err) 801 goto out_err; 802 803 kobj_set_kset_s(&connections_subsys, fuse_subsys); 804 err = subsystem_register(&connections_subsys); 805 if (err) 806 goto out_fuse_unregister; 807 808 return 0; 809 810 out_fuse_unregister: 811 subsystem_unregister(&fuse_subsys); 812 out_err: 813 return err; 814 } 815 816 static void fuse_sysfs_cleanup(void) 817 { 818 subsystem_unregister(&connections_subsys); 819 subsystem_unregister(&fuse_subsys); 820 } 821 822 static int __init fuse_init(void) 823 { 824 int res; 825 826 printk("fuse init (API version %i.%i)\n", 827 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); 828 829 INIT_LIST_HEAD(&fuse_conn_list); 830 res = fuse_fs_init(); 831 if (res) 832 goto err; 833 834 res = fuse_dev_init(); 835 if (res) 836 goto err_fs_cleanup; 837 838 res = fuse_sysfs_init(); 839 if (res) 840 goto err_dev_cleanup; 841 842 res = fuse_ctl_init(); 843 if (res) 844 goto err_sysfs_cleanup; 845 846 return 0; 847 848 err_sysfs_cleanup: 849 fuse_sysfs_cleanup(); 850 err_dev_cleanup: 851 fuse_dev_cleanup(); 852 err_fs_cleanup: 853 fuse_fs_cleanup(); 854 err: 855 return res; 856 } 857 858 static void __exit fuse_exit(void) 859 { 860 printk(KERN_DEBUG "fuse exit\n"); 861 862 fuse_ctl_cleanup(); 863 fuse_sysfs_cleanup(); 864 fuse_fs_cleanup(); 865 fuse_dev_cleanup(); 866 } 867 868 module_init(fuse_init); 869 module_exit(fuse_exit); 870