1 /* 2 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Alex Hornung <ahornung@gmail.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/mount.h> 38 #include <sys/vnode.h> 39 #include <sys/types.h> 40 #include <sys/lock.h> 41 #include <sys/msgport.h> 42 #include <sys/msgport2.h> 43 #include <sys/spinlock2.h> 44 #include <sys/sysctl.h> 45 #include <sys/ucred.h> 46 #include <sys/param.h> 47 #include <sys/sysref2.h> 48 #include <sys/systm.h> 49 #include <sys/devfs.h> 50 #include <sys/devfs_rules.h> 51 #include <sys/hotplug.h> 52 53 MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations"); 54 DEVFS_DECLARE_CLONE_BITMAP(ops_id); 55 /* 56 * SYSREF Integration - reference counting, allocation, 57 * sysid and syslink integration. 58 */ 59 static void devfs_cdev_terminate(cdev_t dev); 60 static void devfs_cdev_lock(cdev_t dev); 61 static void devfs_cdev_unlock(cdev_t dev); 62 static struct sysref_class cdev_sysref_class = { 63 .name = "cdev", 64 .mtype = M_DEVFS, 65 .proto = SYSREF_PROTO_DEV, 66 .offset = offsetof(struct cdev, si_sysref), 67 .objsize = sizeof(struct cdev), 68 .mag_capacity = 32, 69 .flags = 0, 70 .ops = { 71 .terminate = (sysref_terminate_func_t)devfs_cdev_terminate, 72 .lock = (sysref_lock_func_t)devfs_cdev_lock, 73 .unlock = (sysref_unlock_func_t)devfs_cdev_unlock 74 } 75 }; 76 77 static struct objcache *devfs_node_cache; 78 static struct objcache *devfs_msg_cache; 79 static struct objcache *devfs_dev_cache; 80 81 static struct objcache_malloc_args devfs_node_malloc_args = { 82 sizeof(struct devfs_node), M_DEVFS }; 83 struct objcache_malloc_args devfs_msg_malloc_args = { 84 sizeof(struct devfs_msg), M_DEVFS }; 85 struct objcache_malloc_args devfs_dev_malloc_args = { 86 sizeof(struct cdev), M_DEVFS }; 87 88 static struct devfs_dev_head devfs_dev_list = 89 TAILQ_HEAD_INITIALIZER(devfs_dev_list); 90 static struct devfs_mnt_head devfs_mnt_list = 91 TAILQ_HEAD_INITIALIZER(devfs_mnt_list); 92 static struct devfs_chandler_head devfs_chandler_list = 93 TAILQ_HEAD_INITIALIZER(devfs_chandler_list); 94 static struct devfs_alias_head devfs_alias_list = 95 TAILQ_HEAD_INITIALIZER(devfs_alias_list); 96 static struct devfs_dev_ops_head devfs_dev_ops_list = 97 TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list); 98 99 struct lock devfs_lock; 100 static struct lwkt_port devfs_dispose_port; 101 static struct lwkt_port devfs_msg_port; 102 static struct thread *td_core; 103 104 static struct spinlock ino_lock; 105 static ino_t d_ino; 106 static int devfs_debug_enable; 107 static int devfs_run; 108 109 static ino_t devfs_fetch_ino(void); 110 static int devfs_create_all_dev_worker(struct devfs_node *); 111 static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int); 112 static int devfs_destroy_dev_worker(cdev_t); 113 static int devfs_destroy_subnames_worker(char *); 114 static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int); 115 static int devfs_propagate_dev(cdev_t, int); 116 static int devfs_unlink_dev(cdev_t dev); 117 static void devfs_msg_exec(devfs_msg_t msg); 118 119 static int devfs_chandler_add_worker(const char *, d_clone_t *); 120 static int devfs_chandler_del_worker(const char *); 121 122 static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t); 123 static void devfs_msg_core(void *); 124 125 static int devfs_find_device_by_name_worker(devfs_msg_t); 126 static int devfs_find_device_by_udev_worker(devfs_msg_t); 127 128 static int devfs_apply_reset_rules_caller(char *, int); 129 130 static int devfs_scan_callback_worker(devfs_scan_t *); 131 132 static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *, 133 char *, size_t, int); 134 135 static int devfs_make_alias_worker(struct devfs_alias *); 136 static int devfs_alias_remove(cdev_t); 137 static int devfs_alias_reap(void); 138 static int devfs_alias_propagate(struct devfs_alias *); 139 static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *); 140 static int devfs_alias_check_create(struct devfs_node *); 141 142 static int devfs_clr_subnames_flag_worker(char *, uint32_t); 143 static int devfs_destroy_subnames_without_flag_worker(char *, uint32_t); 144 145 static void *devfs_reaperp_callback(struct devfs_node *, void *); 146 static void *devfs_gc_dirs_callback(struct devfs_node *, void *); 147 static void *devfs_gc_links_callback(struct devfs_node *, struct devfs_node *); 148 static void * 149 devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *); 150 151 /* hotplug */ 152 void (*devfs_node_added)(struct hotplug_device*) = NULL; 153 void (*devfs_node_removed)(struct hotplug_device*) = NULL; 154 155 /* 156 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function 157 * using kvprintf 158 */ 159 int 160 devfs_debug(int level, char *fmt, ...) 161 { 162 __va_list ap; 163 164 __va_start(ap, fmt); 165 if (level <= devfs_debug_enable) 166 kvprintf(fmt, ap); 167 __va_end(ap); 168 169 return 0; 170 } 171 172 /* 173 * devfs_allocp() Allocates a new devfs node with the specified 174 * parameters. The node is also automatically linked into the topology 175 * if a parent is specified. It also calls the rule and alias stuff to 176 * be applied on the new node 177 */ 178 struct devfs_node * 179 devfs_allocp(devfs_nodetype devfsnodetype, char *name, 180 struct devfs_node *parent, struct mount *mp, cdev_t dev) 181 { 182 struct devfs_node *node = NULL; 183 size_t namlen = strlen(name); 184 185 node = objcache_get(devfs_node_cache, M_WAITOK); 186 bzero(node, sizeof(*node)); 187 188 atomic_add_long(&(DEVFS_MNTDATA(mp)->leak_count), 1); 189 190 node->d_dev = NULL; 191 node->nchildren = 1; 192 node->mp = mp; 193 node->d_dir.d_ino = devfs_fetch_ino(); 194 195 /* 196 * Cookie jar for children. Leave 0 and 1 for '.' and '..' entries 197 * respectively. 198 */ 199 node->cookie_jar = 2; 200 201 /* 202 * Access Control members 203 */ 204 node->mode = DEVFS_DEFAULT_MODE; 205 node->uid = DEVFS_DEFAULT_UID; 206 node->gid = DEVFS_DEFAULT_GID; 207 208 switch (devfsnodetype) { 209 case Proot: 210 /* 211 * Ensure that we don't recycle the root vnode by marking it as 212 * linked into the topology. 213 */ 214 node->flags |= DEVFS_NODE_LINKED; 215 case Pdir: 216 TAILQ_INIT(DEVFS_DENODE_HEAD(node)); 217 node->d_dir.d_type = DT_DIR; 218 node->nchildren = 2; 219 break; 220 221 case Plink: 222 node->d_dir.d_type = DT_LNK; 223 break; 224 225 case Preg: 226 node->d_dir.d_type = DT_REG; 227 break; 228 229 case Pdev: 230 if (dev != NULL) { 231 node->d_dir.d_type = DT_CHR; 232 node->d_dev = dev; 233 234 node->mode = dev->si_perms; 235 node->uid = dev->si_uid; 236 node->gid = dev->si_gid; 237 238 devfs_alias_check_create(node); 239 } 240 break; 241 242 default: 243 panic("devfs_allocp: unknown node type"); 244 } 245 246 node->v_node = NULL; 247 node->node_type = devfsnodetype; 248 249 /* Initialize the dirent structure of each devfs vnode */ 250 node->d_dir.d_namlen = namlen; 251 node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK); 252 memcpy(node->d_dir.d_name, name, namlen); 253 node->d_dir.d_name[namlen] = '\0'; 254 255 /* Initialize the parent node element */ 256 node->parent = parent; 257 258 /* Apply rules */ 259 devfs_rule_check_apply(node, NULL); 260 261 /* Initialize *time members */ 262 nanotime(&node->atime); 263 node->mtime = node->ctime = node->atime; 264 265 /* 266 * Associate with parent as last step, clean out namecache 267 * reference. 268 */ 269 if ((parent != NULL) && 270 ((parent->node_type == Proot) || (parent->node_type == Pdir))) { 271 parent->nchildren++; 272 node->cookie = parent->cookie_jar++; 273 node->flags |= DEVFS_NODE_LINKED; 274 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link); 275 276 /* This forces negative namecache lookups to clear */ 277 ++mp->mnt_namecache_gen; 278 } 279 280 ++DEVFS_MNTDATA(mp)->file_count; 281 282 return node; 283 } 284 285 /* 286 * devfs_allocv() allocates a new vnode based on a devfs node. 287 */ 288 int 289 devfs_allocv(struct vnode **vpp, struct devfs_node *node) 290 { 291 struct vnode *vp; 292 int error = 0; 293 294 KKASSERT(node); 295 296 try_again: 297 while ((vp = node->v_node) != NULL) { 298 error = vget(vp, LK_EXCLUSIVE); 299 if (error != ENOENT) { 300 *vpp = vp; 301 goto out; 302 } 303 } 304 305 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0) 306 goto out; 307 308 vp = *vpp; 309 310 if (node->v_node != NULL) { 311 vp->v_type = VBAD; 312 vx_put(vp); 313 goto try_again; 314 } 315 316 vp->v_data = node; 317 node->v_node = vp; 318 319 switch (node->node_type) { 320 case Proot: 321 vsetflags(vp, VROOT); 322 /* fall through */ 323 case Pdir: 324 vp->v_type = VDIR; 325 break; 326 327 case Plink: 328 vp->v_type = VLNK; 329 break; 330 331 case Preg: 332 vp->v_type = VREG; 333 break; 334 335 case Pdev: 336 vp->v_type = VCHR; 337 KKASSERT(node->d_dev); 338 339 vp->v_uminor = node->d_dev->si_uminor; 340 vp->v_umajor = 0; 341 342 v_associate_rdev(vp, node->d_dev); 343 vp->v_ops = &node->mp->mnt_vn_spec_ops; 344 break; 345 346 default: 347 panic("devfs_allocv: unknown node type"); 348 } 349 350 out: 351 return error; 352 } 353 354 /* 355 * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode 356 * based on the newly created devfs node. 357 */ 358 int 359 devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype, 360 char *name, struct devfs_node *parent, cdev_t dev) 361 { 362 struct devfs_node *node; 363 364 node = devfs_allocp(devfsnodetype, name, parent, mp, dev); 365 366 if (node != NULL) 367 devfs_allocv(vpp, node); 368 else 369 *vpp = NULL; 370 371 return 0; 372 } 373 374 /* 375 * Destroy the devfs_node. The node must be unlinked from the topology. 376 * 377 * This function will also destroy any vnode association with the node 378 * and device. 379 * 380 * The cdev_t itself remains intact. 381 */ 382 int 383 devfs_freep(struct devfs_node *node) 384 { 385 struct vnode *vp; 386 387 KKASSERT(node); 388 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) || 389 (node->node_type == Proot)); 390 KKASSERT((node->flags & DEVFS_DESTROYED) == 0); 391 392 atomic_subtract_long(&(DEVFS_MNTDATA(node->mp)->leak_count), 1); 393 if (node->symlink_name) { 394 kfree(node->symlink_name, M_DEVFS); 395 node->symlink_name = NULL; 396 } 397 398 /* 399 * Remove the node from the orphan list if it is still on it. 400 */ 401 if (node->flags & DEVFS_ORPHANED) 402 devfs_tracer_del_orphan(node); 403 404 /* 405 * Disassociate the vnode from the node. This also prevents the 406 * vnode's reclaim code from double-freeing the node. 407 * 408 * The vget is needed to safely modify the vp. It also serves 409 * to cycle the refs and terminate the vnode if it happens to 410 * be inactive, otherwise namecache references may not get cleared. 411 */ 412 while ((vp = node->v_node) != NULL) { 413 if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0) 414 break; 415 v_release_rdev(vp); 416 vp->v_data = NULL; 417 node->v_node = NULL; 418 cache_inval_vp(vp, CINV_DESTROY); 419 vput(vp); 420 } 421 if (node->d_dir.d_name) { 422 kfree(node->d_dir.d_name, M_DEVFS); 423 node->d_dir.d_name = NULL; 424 } 425 node->flags |= DEVFS_DESTROYED; 426 427 --DEVFS_MNTDATA(node->mp)->file_count; 428 429 objcache_put(devfs_node_cache, node); 430 431 return 0; 432 } 433 434 /* 435 * Unlink the devfs node from the topology and add it to the orphan list. 436 * The node will later be destroyed by freep. 437 * 438 * Any vnode association, including the v_rdev and v_data, remains intact 439 * until the freep. 440 */ 441 int 442 devfs_unlinkp(struct devfs_node *node) 443 { 444 struct devfs_node *parent; 445 struct hotplug_device *hpdev; 446 KKASSERT(node); 447 448 /* 449 * Add the node to the orphan list, so it is referenced somewhere, to 450 * so we don't leak it. 451 */ 452 devfs_tracer_add_orphan(node); 453 454 parent = node->parent; 455 456 /* 457 * If the parent is known we can unlink the node out of the topology 458 */ 459 if (parent) { 460 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link); 461 parent->nchildren--; 462 KKASSERT((parent->nchildren >= 0)); 463 node->flags &= ~DEVFS_NODE_LINKED; 464 } 465 /* hotplug handler */ 466 if(devfs_node_removed) { 467 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK); 468 hpdev->dev = node->d_dev; 469 if(hpdev->dev) 470 hpdev->name = node->d_dev->si_name; 471 devfs_node_removed(hpdev); 472 kfree(hpdev, M_TEMP); 473 } 474 node->parent = NULL; 475 return 0; 476 } 477 478 void * 479 devfs_iterate_topology(struct devfs_node *node, 480 devfs_iterate_callback_t *callback, void *arg1) 481 { 482 struct devfs_node *node1, *node2; 483 void *ret = NULL; 484 485 if ((node->node_type == Proot) || (node->node_type == Pdir)) { 486 if (node->nchildren > 2) { 487 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), 488 link, node2) { 489 if ((ret = devfs_iterate_topology(node1, callback, arg1))) 490 return ret; 491 } 492 } 493 } 494 495 ret = callback(node, arg1); 496 return ret; 497 } 498 499 /* 500 * devfs_reaperp() is a recursive function that iterates through all the 501 * topology, unlinking and freeing all devfs nodes. 502 */ 503 static void * 504 devfs_reaperp_callback(struct devfs_node *node, void *unused) 505 { 506 devfs_unlinkp(node); 507 devfs_freep(node); 508 509 return NULL; 510 } 511 512 static void * 513 devfs_gc_dirs_callback(struct devfs_node *node, void *unused) 514 { 515 if (node->node_type == Pdir) { 516 if (node->nchildren == 2) { 517 devfs_unlinkp(node); 518 devfs_freep(node); 519 } 520 } 521 522 return NULL; 523 } 524 525 static void * 526 devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target) 527 { 528 if ((node->node_type == Plink) && (node->link_target == target)) { 529 devfs_unlinkp(node); 530 devfs_freep(node); 531 } 532 533 return NULL; 534 } 535 536 /* 537 * devfs_gc() is devfs garbage collector. It takes care of unlinking and 538 * freeing a node, but also removes empty directories and links that link 539 * via devfs auto-link mechanism to the node being deleted. 540 */ 541 int 542 devfs_gc(struct devfs_node *node) 543 { 544 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node; 545 546 if (node->nlinks > 0) 547 devfs_iterate_topology(root_node, 548 (devfs_iterate_callback_t *)devfs_gc_links_callback, node); 549 550 devfs_unlinkp(node); 551 devfs_iterate_topology(root_node, 552 (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL); 553 554 devfs_freep(node); 555 556 return 0; 557 } 558 559 /* 560 * devfs_create_dev() is the asynchronous entry point for device creation. 561 * It just sends a message with the relevant details to the devfs core. 562 * 563 * This function will reference the passed device. The reference is owned 564 * by devfs and represents all of the device's node associations. 565 */ 566 int 567 devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms) 568 { 569 reference_dev(dev); 570 devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms); 571 572 return 0; 573 } 574 575 /* 576 * devfs_destroy_dev() is the asynchronous entry point for device destruction. 577 * It just sends a message with the relevant details to the devfs core. 578 */ 579 int 580 devfs_destroy_dev(cdev_t dev) 581 { 582 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0); 583 return 0; 584 } 585 586 /* 587 * devfs_mount_add() is the synchronous entry point for adding a new devfs 588 * mount. It sends a synchronous message with the relevant details to the 589 * devfs core. 590 */ 591 int 592 devfs_mount_add(struct devfs_mnt_data *mnt) 593 { 594 devfs_msg_t msg; 595 596 msg = devfs_msg_get(); 597 msg->mdv_mnt = mnt; 598 msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg); 599 devfs_msg_put(msg); 600 601 return 0; 602 } 603 604 /* 605 * devfs_mount_del() is the synchronous entry point for removing a devfs mount. 606 * It sends a synchronous message with the relevant details to the devfs core. 607 */ 608 int 609 devfs_mount_del(struct devfs_mnt_data *mnt) 610 { 611 devfs_msg_t msg; 612 613 msg = devfs_msg_get(); 614 msg->mdv_mnt = mnt; 615 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg); 616 devfs_msg_put(msg); 617 618 return 0; 619 } 620 621 /* 622 * devfs_destroy_subnames() is the synchronous entry point for device 623 * destruction by subname. It just sends a message with the relevant details to 624 * the devfs core. 625 */ 626 int 627 devfs_destroy_subnames(char *name) 628 { 629 devfs_msg_t msg; 630 631 msg = devfs_msg_get(); 632 msg->mdv_load = name; 633 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES, msg); 634 devfs_msg_put(msg); 635 return 0; 636 } 637 638 int 639 devfs_clr_subnames_flag(char *name, uint32_t flag) 640 { 641 devfs_msg_t msg; 642 643 msg = devfs_msg_get(); 644 msg->mdv_flags.name = name; 645 msg->mdv_flags.flag = flag; 646 msg = devfs_msg_send_sync(DEVFS_CLR_SUBNAMES_FLAG, msg); 647 devfs_msg_put(msg); 648 649 return 0; 650 } 651 652 int 653 devfs_destroy_subnames_without_flag(char *name, uint32_t flag) 654 { 655 devfs_msg_t msg; 656 657 msg = devfs_msg_get(); 658 msg->mdv_flags.name = name; 659 msg->mdv_flags.flag = flag; 660 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES_WO_FLAG, msg); 661 devfs_msg_put(msg); 662 663 return 0; 664 } 665 666 /* 667 * devfs_create_all_dev is the asynchronous entry point to trigger device 668 * node creation. It just sends a message with the relevant details to 669 * the devfs core. 670 */ 671 int 672 devfs_create_all_dev(struct devfs_node *root) 673 { 674 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root); 675 return 0; 676 } 677 678 /* 679 * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all 680 * devices with a specific set of dev_ops and minor. It just sends a 681 * message with the relevant details to the devfs core. 682 */ 683 int 684 devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor) 685 { 686 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor); 687 return 0; 688 } 689 690 /* 691 * devfs_clone_handler_add is the synchronous entry point to add a new 692 * clone handler. It just sends a message with the relevant details to 693 * the devfs core. 694 */ 695 int 696 devfs_clone_handler_add(const char *name, d_clone_t *nhandler) 697 { 698 devfs_msg_t msg; 699 700 msg = devfs_msg_get(); 701 msg->mdv_chandler.name = name; 702 msg->mdv_chandler.nhandler = nhandler; 703 msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg); 704 devfs_msg_put(msg); 705 return 0; 706 } 707 708 /* 709 * devfs_clone_handler_del is the synchronous entry point to remove a 710 * clone handler. It just sends a message with the relevant details to 711 * the devfs core. 712 */ 713 int 714 devfs_clone_handler_del(const char *name) 715 { 716 devfs_msg_t msg; 717 718 msg = devfs_msg_get(); 719 msg->mdv_chandler.name = name; 720 msg->mdv_chandler.nhandler = NULL; 721 msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg); 722 devfs_msg_put(msg); 723 return 0; 724 } 725 726 /* 727 * devfs_find_device_by_name is the synchronous entry point to find a 728 * device given its name. It sends a synchronous message with the 729 * relevant details to the devfs core and returns the answer. 730 */ 731 cdev_t 732 devfs_find_device_by_name(const char *fmt, ...) 733 { 734 cdev_t found = NULL; 735 devfs_msg_t msg; 736 char *target; 737 __va_list ap; 738 739 if (fmt == NULL) 740 return NULL; 741 742 __va_start(ap, fmt); 743 kvasnrprintf(&target, PATH_MAX, 10, fmt, ap); 744 __va_end(ap); 745 746 msg = devfs_msg_get(); 747 msg->mdv_name = target; 748 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg); 749 found = msg->mdv_cdev; 750 devfs_msg_put(msg); 751 kvasfree(&target); 752 753 return found; 754 } 755 756 /* 757 * devfs_find_device_by_udev is the synchronous entry point to find a 758 * device given its udev number. It sends a synchronous message with 759 * the relevant details to the devfs core and returns the answer. 760 */ 761 cdev_t 762 devfs_find_device_by_udev(udev_t udev) 763 { 764 cdev_t found = NULL; 765 devfs_msg_t msg; 766 767 msg = devfs_msg_get(); 768 msg->mdv_udev = udev; 769 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg); 770 found = msg->mdv_cdev; 771 devfs_msg_put(msg); 772 773 devfs_debug(DEVFS_DEBUG_DEBUG, 774 "devfs_find_device_by_udev found? %s -end:3-\n", 775 ((found) ? found->si_name:"NO")); 776 return found; 777 } 778 779 struct vnode * 780 devfs_inode_to_vnode(struct mount *mp, ino_t target) 781 { 782 struct vnode *vp = NULL; 783 devfs_msg_t msg; 784 785 if (mp == NULL) 786 return NULL; 787 788 msg = devfs_msg_get(); 789 msg->mdv_ino.mp = mp; 790 msg->mdv_ino.ino = target; 791 msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg); 792 vp = msg->mdv_ino.vp; 793 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 794 devfs_msg_put(msg); 795 796 return vp; 797 } 798 799 /* 800 * devfs_make_alias is the asynchronous entry point to register an alias 801 * for a device. It just sends a message with the relevant details to the 802 * devfs core. 803 */ 804 int 805 devfs_make_alias(const char *name, cdev_t dev_target) 806 { 807 struct devfs_alias *alias; 808 size_t len; 809 810 len = strlen(name); 811 812 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK); 813 alias->name = kstrdup(name, M_DEVFS); 814 alias->namlen = len; 815 alias->dev_target = dev_target; 816 817 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias); 818 return 0; 819 } 820 821 /* 822 * devfs_apply_rules is the asynchronous entry point to trigger application 823 * of all rules. It just sends a message with the relevant details to the 824 * devfs core. 825 */ 826 int 827 devfs_apply_rules(char *mntto) 828 { 829 char *new_name; 830 831 new_name = kstrdup(mntto, M_DEVFS); 832 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name); 833 834 return 0; 835 } 836 837 /* 838 * devfs_reset_rules is the asynchronous entry point to trigger reset of all 839 * rules. It just sends a message with the relevant details to the devfs core. 840 */ 841 int 842 devfs_reset_rules(char *mntto) 843 { 844 char *new_name; 845 846 new_name = kstrdup(mntto, M_DEVFS); 847 devfs_msg_send_name(DEVFS_RESET_RULES, new_name); 848 849 return 0; 850 } 851 852 853 /* 854 * devfs_scan_callback is the asynchronous entry point to call a callback 855 * on all cdevs. 856 * It just sends a message with the relevant details to the devfs core. 857 */ 858 int 859 devfs_scan_callback(devfs_scan_t *callback) 860 { 861 devfs_msg_t msg; 862 863 KKASSERT(sizeof(callback) == sizeof(void *)); 864 865 msg = devfs_msg_get(); 866 msg->mdv_load = callback; 867 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg); 868 devfs_msg_put(msg); 869 870 return 0; 871 } 872 873 874 /* 875 * Acts as a message drain. Any message that is replied to here gets destroyed 876 * and the memory freed. 877 */ 878 static void 879 devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg) 880 { 881 devfs_msg_put((devfs_msg_t)msg); 882 } 883 884 /* 885 * devfs_msg_get allocates a new devfs msg and returns it. 886 */ 887 devfs_msg_t 888 devfs_msg_get(void) 889 { 890 return objcache_get(devfs_msg_cache, M_WAITOK); 891 } 892 893 /* 894 * devfs_msg_put deallocates a given devfs msg. 895 */ 896 int 897 devfs_msg_put(devfs_msg_t msg) 898 { 899 objcache_put(devfs_msg_cache, msg); 900 return 0; 901 } 902 903 /* 904 * devfs_msg_send is the generic asynchronous message sending facility 905 * for devfs. By default the reply port is the automatic disposal port. 906 * 907 * If the current thread is the devfs_msg_port thread we execute the 908 * operation synchronously. 909 */ 910 void 911 devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg) 912 { 913 lwkt_port_t port = &devfs_msg_port; 914 915 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0); 916 917 devfs_msg->hdr.u.ms_result = cmd; 918 919 if (port->mpu_td == curthread) { 920 devfs_msg_exec(devfs_msg); 921 lwkt_replymsg(&devfs_msg->hdr, 0); 922 } else { 923 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg); 924 } 925 } 926 927 /* 928 * devfs_msg_send_sync is the generic synchronous message sending 929 * facility for devfs. It initializes a local reply port and waits 930 * for the core's answer. This answer is then returned. 931 */ 932 devfs_msg_t 933 devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg) 934 { 935 struct lwkt_port rep_port; 936 devfs_msg_t msg_incoming; 937 lwkt_port_t port = &devfs_msg_port; 938 939 lwkt_initport_thread(&rep_port, curthread); 940 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0); 941 942 devfs_msg->hdr.u.ms_result = cmd; 943 944 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg); 945 msg_incoming = lwkt_waitport(&rep_port, 0); 946 947 return msg_incoming; 948 } 949 950 /* 951 * sends a message with a generic argument. 952 */ 953 void 954 devfs_msg_send_generic(uint32_t cmd, void *load) 955 { 956 devfs_msg_t devfs_msg = devfs_msg_get(); 957 958 devfs_msg->mdv_load = load; 959 devfs_msg_send(cmd, devfs_msg); 960 } 961 962 /* 963 * sends a message with a name argument. 964 */ 965 void 966 devfs_msg_send_name(uint32_t cmd, char *name) 967 { 968 devfs_msg_t devfs_msg = devfs_msg_get(); 969 970 devfs_msg->mdv_name = name; 971 devfs_msg_send(cmd, devfs_msg); 972 } 973 974 /* 975 * sends a message with a mount argument. 976 */ 977 void 978 devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt) 979 { 980 devfs_msg_t devfs_msg = devfs_msg_get(); 981 982 devfs_msg->mdv_mnt = mnt; 983 devfs_msg_send(cmd, devfs_msg); 984 } 985 986 /* 987 * sends a message with an ops argument. 988 */ 989 void 990 devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor) 991 { 992 devfs_msg_t devfs_msg = devfs_msg_get(); 993 994 devfs_msg->mdv_ops.ops = ops; 995 devfs_msg->mdv_ops.minor = minor; 996 devfs_msg_send(cmd, devfs_msg); 997 } 998 999 /* 1000 * sends a message with a clone handler argument. 1001 */ 1002 void 1003 devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler) 1004 { 1005 devfs_msg_t devfs_msg = devfs_msg_get(); 1006 1007 devfs_msg->mdv_chandler.name = name; 1008 devfs_msg->mdv_chandler.nhandler = handler; 1009 devfs_msg_send(cmd, devfs_msg); 1010 } 1011 1012 /* 1013 * sends a message with a device argument. 1014 */ 1015 void 1016 devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms) 1017 { 1018 devfs_msg_t devfs_msg = devfs_msg_get(); 1019 1020 devfs_msg->mdv_dev.dev = dev; 1021 devfs_msg->mdv_dev.uid = uid; 1022 devfs_msg->mdv_dev.gid = gid; 1023 devfs_msg->mdv_dev.perms = perms; 1024 1025 devfs_msg_send(cmd, devfs_msg); 1026 } 1027 1028 /* 1029 * sends a message with a link argument. 1030 */ 1031 void 1032 devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp) 1033 { 1034 devfs_msg_t devfs_msg = devfs_msg_get(); 1035 1036 devfs_msg->mdv_link.name = name; 1037 devfs_msg->mdv_link.target = target; 1038 devfs_msg->mdv_link.mp = mp; 1039 devfs_msg_send(cmd, devfs_msg); 1040 } 1041 1042 /* 1043 * devfs_msg_core is the main devfs thread. It handles all incoming messages 1044 * and calls the relevant worker functions. By using messages it's assured 1045 * that events occur in the correct order. 1046 */ 1047 static void 1048 devfs_msg_core(void *arg) 1049 { 1050 devfs_msg_t msg; 1051 1052 devfs_run = 1; 1053 lwkt_initport_thread(&devfs_msg_port, curthread); 1054 wakeup(td_core); 1055 1056 while (devfs_run) { 1057 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0); 1058 devfs_debug(DEVFS_DEBUG_DEBUG, 1059 "devfs_msg_core, new msg: %x\n", 1060 (unsigned int)msg->hdr.u.ms_result); 1061 devfs_msg_exec(msg); 1062 lwkt_replymsg(&msg->hdr, 0); 1063 } 1064 wakeup(td_core); 1065 lwkt_exit(); 1066 } 1067 1068 static void 1069 devfs_msg_exec(devfs_msg_t msg) 1070 { 1071 struct devfs_mnt_data *mnt; 1072 struct devfs_node *node; 1073 cdev_t dev; 1074 1075 /* 1076 * Acquire the devfs lock to ensure safety of all called functions 1077 */ 1078 lockmgr(&devfs_lock, LK_EXCLUSIVE); 1079 1080 switch (msg->hdr.u.ms_result) { 1081 case DEVFS_DEVICE_CREATE: 1082 dev = msg->mdv_dev.dev; 1083 devfs_create_dev_worker(dev, 1084 msg->mdv_dev.uid, 1085 msg->mdv_dev.gid, 1086 msg->mdv_dev.perms); 1087 break; 1088 case DEVFS_DEVICE_DESTROY: 1089 dev = msg->mdv_dev.dev; 1090 devfs_destroy_dev_worker(dev); 1091 break; 1092 case DEVFS_DESTROY_SUBNAMES: 1093 devfs_destroy_subnames_worker(msg->mdv_load); 1094 break; 1095 case DEVFS_DESTROY_DEV_BY_OPS: 1096 devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops, 1097 msg->mdv_ops.minor); 1098 break; 1099 case DEVFS_CREATE_ALL_DEV: 1100 node = (struct devfs_node *)msg->mdv_load; 1101 devfs_create_all_dev_worker(node); 1102 break; 1103 case DEVFS_MOUNT_ADD: 1104 mnt = msg->mdv_mnt; 1105 TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link); 1106 devfs_create_all_dev_worker(mnt->root_node); 1107 break; 1108 case DEVFS_MOUNT_DEL: 1109 mnt = msg->mdv_mnt; 1110 TAILQ_REMOVE(&devfs_mnt_list, mnt, link); 1111 devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback, 1112 NULL); 1113 if (mnt->leak_count) { 1114 devfs_debug(DEVFS_DEBUG_SHOW, 1115 "Leaked %ld devfs_node elements!\n", 1116 mnt->leak_count); 1117 } 1118 break; 1119 case DEVFS_CHANDLER_ADD: 1120 devfs_chandler_add_worker(msg->mdv_chandler.name, 1121 msg->mdv_chandler.nhandler); 1122 break; 1123 case DEVFS_CHANDLER_DEL: 1124 devfs_chandler_del_worker(msg->mdv_chandler.name); 1125 break; 1126 case DEVFS_FIND_DEVICE_BY_NAME: 1127 devfs_find_device_by_name_worker(msg); 1128 break; 1129 case DEVFS_FIND_DEVICE_BY_UDEV: 1130 devfs_find_device_by_udev_worker(msg); 1131 break; 1132 case DEVFS_MAKE_ALIAS: 1133 devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load); 1134 break; 1135 case DEVFS_APPLY_RULES: 1136 devfs_apply_reset_rules_caller(msg->mdv_name, 1); 1137 break; 1138 case DEVFS_RESET_RULES: 1139 devfs_apply_reset_rules_caller(msg->mdv_name, 0); 1140 break; 1141 case DEVFS_SCAN_CALLBACK: 1142 devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load); 1143 break; 1144 case DEVFS_CLR_SUBNAMES_FLAG: 1145 devfs_clr_subnames_flag_worker(msg->mdv_flags.name, 1146 msg->mdv_flags.flag); 1147 break; 1148 case DEVFS_DESTROY_SUBNAMES_WO_FLAG: 1149 devfs_destroy_subnames_without_flag_worker(msg->mdv_flags.name, 1150 msg->mdv_flags.flag); 1151 break; 1152 case DEVFS_INODE_TO_VNODE: 1153 msg->mdv_ino.vp = devfs_iterate_topology( 1154 DEVFS_MNTDATA(msg->mdv_ino.mp)->root_node, 1155 (devfs_iterate_callback_t *)devfs_inode_to_vnode_worker_callback, 1156 &msg->mdv_ino.ino); 1157 break; 1158 case DEVFS_TERMINATE_CORE: 1159 devfs_run = 0; 1160 break; 1161 case DEVFS_SYNC: 1162 break; 1163 default: 1164 devfs_debug(DEVFS_DEBUG_WARNING, 1165 "devfs_msg_core: unknown message " 1166 "received at core\n"); 1167 break; 1168 } 1169 lockmgr(&devfs_lock, LK_RELEASE); 1170 } 1171 1172 /* 1173 * Worker function to insert a new dev into the dev list and initialize its 1174 * permissions. It also calls devfs_propagate_dev which in turn propagates 1175 * the change to all mount points. 1176 * 1177 * The passed dev is already referenced. This reference is eaten by this 1178 * function and represents the dev's linkage into devfs_dev_list. 1179 */ 1180 static int 1181 devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms) 1182 { 1183 KKASSERT(dev); 1184 1185 dev->si_uid = uid; 1186 dev->si_gid = gid; 1187 dev->si_perms = perms; 1188 1189 devfs_link_dev(dev); 1190 devfs_propagate_dev(dev, 1); 1191 1192 return 0; 1193 } 1194 1195 /* 1196 * Worker function to delete a dev from the dev list and free the cdev. 1197 * It also calls devfs_propagate_dev which in turn propagates the change 1198 * to all mount points. 1199 */ 1200 static int 1201 devfs_destroy_dev_worker(cdev_t dev) 1202 { 1203 int error; 1204 1205 KKASSERT(dev); 1206 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE); 1207 1208 error = devfs_unlink_dev(dev); 1209 devfs_propagate_dev(dev, 0); 1210 if (error == 0) 1211 release_dev(dev); /* link ref */ 1212 release_dev(dev); 1213 release_dev(dev); 1214 1215 return 0; 1216 } 1217 1218 /* 1219 * Worker function to destroy all devices with a certain basename. 1220 * Calls devfs_destroy_dev_worker for the actual destruction. 1221 */ 1222 static int 1223 devfs_destroy_subnames_worker(char *name) 1224 { 1225 cdev_t dev, dev1; 1226 size_t len = strlen(name); 1227 1228 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { 1229 if ((!strncmp(dev->si_name, name, len)) && 1230 (dev->si_name[len] != '\0')) { 1231 devfs_destroy_dev_worker(dev); 1232 } 1233 } 1234 return 0; 1235 } 1236 1237 static int 1238 devfs_clr_subnames_flag_worker(char *name, uint32_t flag) 1239 { 1240 cdev_t dev, dev1; 1241 size_t len = strlen(name); 1242 1243 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { 1244 if ((!strncmp(dev->si_name, name, len)) && 1245 (dev->si_name[len] != '\0')) { 1246 dev->si_flags &= ~flag; 1247 } 1248 } 1249 1250 return 0; 1251 } 1252 1253 static int 1254 devfs_destroy_subnames_without_flag_worker(char *name, uint32_t flag) 1255 { 1256 cdev_t dev, dev1; 1257 size_t len = strlen(name); 1258 1259 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { 1260 if ((!strncmp(dev->si_name, name, len)) && 1261 (dev->si_name[len] != '\0')) { 1262 if (!(dev->si_flags & flag)) { 1263 devfs_destroy_dev_worker(dev); 1264 } 1265 } 1266 } 1267 1268 return 0; 1269 } 1270 1271 /* 1272 * Worker function that creates all device nodes on top of a devfs 1273 * root node. 1274 */ 1275 static int 1276 devfs_create_all_dev_worker(struct devfs_node *root) 1277 { 1278 cdev_t dev; 1279 1280 KKASSERT(root); 1281 1282 TAILQ_FOREACH(dev, &devfs_dev_list, link) { 1283 devfs_create_device_node(root, dev, NULL, NULL); 1284 } 1285 1286 return 0; 1287 } 1288 1289 /* 1290 * Worker function that destroys all devices that match a specific 1291 * dev_ops and/or minor. If minor is less than 0, it is not matched 1292 * against. It also propagates all changes. 1293 */ 1294 static int 1295 devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor) 1296 { 1297 cdev_t dev, dev1; 1298 1299 KKASSERT(ops); 1300 1301 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { 1302 if (dev->si_ops != ops) 1303 continue; 1304 if ((minor < 0) || (dev->si_uminor == minor)) { 1305 devfs_destroy_dev_worker(dev); 1306 } 1307 } 1308 1309 return 0; 1310 } 1311 1312 /* 1313 * Worker function that registers a new clone handler in devfs. 1314 */ 1315 static int 1316 devfs_chandler_add_worker(const char *name, d_clone_t *nhandler) 1317 { 1318 struct devfs_clone_handler *chandler = NULL; 1319 u_char len = strlen(name); 1320 1321 if (len == 0) 1322 return 1; 1323 1324 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) { 1325 if (chandler->namlen != len) 1326 continue; 1327 1328 if (!memcmp(chandler->name, name, len)) { 1329 /* Clonable basename already exists */ 1330 return 1; 1331 } 1332 } 1333 1334 chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO); 1335 chandler->name = kstrdup(name, M_DEVFS); 1336 chandler->namlen = len; 1337 chandler->nhandler = nhandler; 1338 1339 TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link); 1340 return 0; 1341 } 1342 1343 /* 1344 * Worker function that removes a given clone handler from the 1345 * clone handler list. 1346 */ 1347 static int 1348 devfs_chandler_del_worker(const char *name) 1349 { 1350 struct devfs_clone_handler *chandler, *chandler2; 1351 u_char len = strlen(name); 1352 1353 if (len == 0) 1354 return 1; 1355 1356 TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) { 1357 if (chandler->namlen != len) 1358 continue; 1359 if (memcmp(chandler->name, name, len)) 1360 continue; 1361 1362 TAILQ_REMOVE(&devfs_chandler_list, chandler, link); 1363 kfree(chandler->name, M_DEVFS); 1364 kfree(chandler, M_DEVFS); 1365 break; 1366 } 1367 1368 return 0; 1369 } 1370 1371 /* 1372 * Worker function that finds a given device name and changes 1373 * the message received accordingly so that when replied to, 1374 * the answer is returned to the caller. 1375 */ 1376 static int 1377 devfs_find_device_by_name_worker(devfs_msg_t devfs_msg) 1378 { 1379 struct devfs_alias *alias; 1380 cdev_t dev; 1381 cdev_t found = NULL; 1382 1383 TAILQ_FOREACH(dev, &devfs_dev_list, link) { 1384 if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) { 1385 found = dev; 1386 break; 1387 } 1388 } 1389 if (found == NULL) { 1390 TAILQ_FOREACH(alias, &devfs_alias_list, link) { 1391 if (strcmp(devfs_msg->mdv_name, alias->name) == 0) { 1392 found = alias->dev_target; 1393 break; 1394 } 1395 } 1396 } 1397 devfs_msg->mdv_cdev = found; 1398 1399 return 0; 1400 } 1401 1402 /* 1403 * Worker function that finds a given device udev and changes 1404 * the message received accordingly so that when replied to, 1405 * the answer is returned to the caller. 1406 */ 1407 static int 1408 devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg) 1409 { 1410 cdev_t dev, dev1; 1411 cdev_t found = NULL; 1412 1413 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { 1414 if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) { 1415 found = dev; 1416 break; 1417 } 1418 } 1419 devfs_msg->mdv_cdev = found; 1420 1421 return 0; 1422 } 1423 1424 /* 1425 * Worker function that inserts a given alias into the 1426 * alias list, and propagates the alias to all mount 1427 * points. 1428 */ 1429 static int 1430 devfs_make_alias_worker(struct devfs_alias *alias) 1431 { 1432 struct devfs_alias *alias2; 1433 size_t len = strlen(alias->name); 1434 int found = 0; 1435 1436 TAILQ_FOREACH(alias2, &devfs_alias_list, link) { 1437 if (len != alias2->namlen) 1438 continue; 1439 1440 if (!memcmp(alias->name, alias2->name, len)) { 1441 found = 1; 1442 break; 1443 } 1444 } 1445 1446 if (!found) { 1447 /* 1448 * The alias doesn't exist yet, so we add it to the alias list 1449 */ 1450 TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link); 1451 devfs_alias_propagate(alias); 1452 } else { 1453 devfs_debug(DEVFS_DEBUG_WARNING, 1454 "Warning: duplicate devfs_make_alias for %s\n", 1455 alias->name); 1456 kfree(alias->name, M_DEVFS); 1457 kfree(alias, M_DEVFS); 1458 } 1459 1460 return 0; 1461 } 1462 1463 /* 1464 * Function that removes and frees all aliases. 1465 */ 1466 static int 1467 devfs_alias_reap(void) 1468 { 1469 struct devfs_alias *alias, *alias2; 1470 1471 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) { 1472 TAILQ_REMOVE(&devfs_alias_list, alias, link); 1473 kfree(alias, M_DEVFS); 1474 } 1475 return 0; 1476 } 1477 1478 /* 1479 * Function that removes an alias matching a specific cdev and frees 1480 * it accordingly. 1481 */ 1482 static int 1483 devfs_alias_remove(cdev_t dev) 1484 { 1485 struct devfs_alias *alias, *alias2; 1486 1487 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) { 1488 if (alias->dev_target == dev) { 1489 TAILQ_REMOVE(&devfs_alias_list, alias, link); 1490 kfree(alias, M_DEVFS); 1491 } 1492 } 1493 return 0; 1494 } 1495 1496 /* 1497 * This function propagates a new alias to all mount points. 1498 */ 1499 static int 1500 devfs_alias_propagate(struct devfs_alias *alias) 1501 { 1502 struct devfs_mnt_data *mnt; 1503 1504 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { 1505 devfs_alias_apply(mnt->root_node, alias); 1506 } 1507 return 0; 1508 } 1509 1510 /* 1511 * This function is a recursive function iterating through 1512 * all device nodes in the topology and, if applicable, 1513 * creating the relevant alias for a device node. 1514 */ 1515 static int 1516 devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias) 1517 { 1518 struct devfs_node *node1, *node2; 1519 1520 KKASSERT(alias != NULL); 1521 1522 if ((node->node_type == Proot) || (node->node_type == Pdir)) { 1523 if (node->nchildren > 2) { 1524 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) { 1525 devfs_alias_apply(node1, alias); 1526 } 1527 } 1528 } else { 1529 if (node->d_dev == alias->dev_target) 1530 devfs_alias_create(alias->name, node, 0); 1531 } 1532 return 0; 1533 } 1534 1535 /* 1536 * This function checks if any alias possibly is applicable 1537 * to the given node. If so, the alias is created. 1538 */ 1539 static int 1540 devfs_alias_check_create(struct devfs_node *node) 1541 { 1542 struct devfs_alias *alias; 1543 1544 TAILQ_FOREACH(alias, &devfs_alias_list, link) { 1545 if (node->d_dev == alias->dev_target) 1546 devfs_alias_create(alias->name, node, 0); 1547 } 1548 return 0; 1549 } 1550 1551 /* 1552 * This function creates an alias with a given name 1553 * linking to a given devfs node. It also increments 1554 * the link count on the target node. 1555 */ 1556 int 1557 devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based) 1558 { 1559 struct mount *mp = target->mp; 1560 struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node; 1561 struct devfs_node *linknode; 1562 struct hotplug_device *hpdev; 1563 char *create_path = NULL; 1564 char *name; 1565 char *name_buf; 1566 int result = 0; 1567 1568 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE); 1569 1570 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); 1571 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name); 1572 1573 if (create_path) 1574 parent = devfs_resolve_or_create_path(parent, create_path, 1); 1575 1576 1577 if (devfs_find_device_node_by_name(parent, name)) { 1578 devfs_debug(DEVFS_DEBUG_WARNING, 1579 "Node already exists: %s " 1580 "(devfs_make_alias_worker)!\n", 1581 name); 1582 result = 1; 1583 goto done; 1584 } 1585 1586 linknode = devfs_allocp(Plink, name, parent, mp, NULL); 1587 if (linknode == NULL) { 1588 result = 1; 1589 goto done; 1590 } 1591 1592 linknode->link_target = target; 1593 target->nlinks++; 1594 1595 if (rule_based) 1596 linknode->flags |= DEVFS_RULE_CREATED; 1597 1598 done: 1599 /* hotplug handler */ 1600 if(devfs_node_added) { 1601 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK); 1602 hpdev->dev = target->d_dev; 1603 hpdev->name = name_orig; 1604 devfs_node_added(hpdev); 1605 kfree(hpdev, M_TEMP); 1606 } 1607 kfree(name_buf, M_TEMP); 1608 return (result); 1609 } 1610 1611 /* 1612 * This function is called by the core and handles mount point 1613 * strings. It either calls the relevant worker (devfs_apply_ 1614 * reset_rules_worker) on all mountpoints or only a specific 1615 * one. 1616 */ 1617 static int 1618 devfs_apply_reset_rules_caller(char *mountto, int apply) 1619 { 1620 struct devfs_mnt_data *mnt; 1621 1622 if (mountto[0] == '*') { 1623 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { 1624 devfs_iterate_topology(mnt->root_node, 1625 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node), 1626 NULL); 1627 } 1628 } else { 1629 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { 1630 if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) { 1631 devfs_iterate_topology(mnt->root_node, 1632 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node), 1633 NULL); 1634 break; 1635 } 1636 } 1637 } 1638 1639 kfree(mountto, M_DEVFS); 1640 return 0; 1641 } 1642 1643 /* 1644 * This function calls a given callback function for 1645 * every dev node in the devfs dev list. 1646 */ 1647 static int 1648 devfs_scan_callback_worker(devfs_scan_t *callback) 1649 { 1650 cdev_t dev, dev1; 1651 1652 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { 1653 callback(dev); 1654 } 1655 1656 return 0; 1657 } 1658 1659 /* 1660 * This function tries to resolve a given directory, or if not 1661 * found and creation requested, creates the given directory. 1662 */ 1663 static struct devfs_node * 1664 devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name, 1665 size_t name_len, int create) 1666 { 1667 struct devfs_node *node, *found = NULL; 1668 1669 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) { 1670 if (name_len != node->d_dir.d_namlen) 1671 continue; 1672 1673 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) { 1674 found = node; 1675 break; 1676 } 1677 } 1678 1679 if ((found == NULL) && (create)) { 1680 found = devfs_allocp(Pdir, dir_name, parent, parent->mp, NULL); 1681 } 1682 1683 return found; 1684 } 1685 1686 /* 1687 * This function tries to resolve a complete path. If creation is requested, 1688 * if a given part of the path cannot be resolved (because it doesn't exist), 1689 * it is created. 1690 */ 1691 struct devfs_node * 1692 devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create) 1693 { 1694 struct devfs_node *node = parent; 1695 char *buf; 1696 size_t idx = 0; 1697 1698 if (path == NULL) 1699 return parent; 1700 1701 buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); 1702 1703 while (*path && idx < PATH_MAX - 1) { 1704 if (*path != '/') { 1705 buf[idx++] = *path; 1706 } else { 1707 buf[idx] = '\0'; 1708 node = devfs_resolve_or_create_dir(node, buf, idx, create); 1709 if (node == NULL) { 1710 kfree(buf, M_TEMP); 1711 return NULL; 1712 } 1713 idx = 0; 1714 } 1715 ++path; 1716 } 1717 buf[idx] = '\0'; 1718 node = devfs_resolve_or_create_dir(node, buf, idx, create); 1719 kfree (buf, M_TEMP); 1720 return (node); 1721 } 1722 1723 /* 1724 * Takes a full path and strips it into a directory path and a name. 1725 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It 1726 * requires a working buffer with enough size to keep the whole 1727 * fullpath. 1728 */ 1729 int 1730 devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep) 1731 { 1732 char *name = NULL; 1733 char *path = NULL; 1734 size_t len = strlen(fullpath) + 1; 1735 int i; 1736 1737 KKASSERT((fullpath != NULL) && (buf != NULL)); 1738 KKASSERT((pathp != NULL) && (namep != NULL)); 1739 1740 memcpy(buf, fullpath, len); 1741 1742 for (i = len-1; i>= 0; i--) { 1743 if (buf[i] == '/') { 1744 buf[i] = '\0'; 1745 name = &(buf[i+1]); 1746 path = buf; 1747 break; 1748 } 1749 } 1750 1751 *pathp = path; 1752 1753 if (name) { 1754 *namep = name; 1755 } else { 1756 *namep = buf; 1757 } 1758 1759 return 0; 1760 } 1761 1762 /* 1763 * This function creates a new devfs node for a given device. It can 1764 * handle a complete path as device name, and accordingly creates 1765 * the path and the final device node. 1766 * 1767 * The reference count on the passed dev remains unchanged. 1768 */ 1769 struct devfs_node * 1770 devfs_create_device_node(struct devfs_node *root, cdev_t dev, 1771 char *dev_name, char *path_fmt, ...) 1772 { 1773 struct devfs_node *parent, *node = NULL; 1774 struct hotplug_device *hpdev; 1775 char *path = NULL; 1776 char *name; 1777 char *name_buf; 1778 __va_list ap; 1779 int i, found; 1780 char *create_path = NULL; 1781 char *names = "pqrsPQRS"; 1782 1783 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); 1784 1785 if (path_fmt != NULL) { 1786 __va_start(ap, path_fmt); 1787 kvasnrprintf(&path, PATH_MAX, 10, path_fmt, ap); 1788 __va_end(ap); 1789 } 1790 1791 parent = devfs_resolve_or_create_path(root, path, 1); 1792 KKASSERT(parent); 1793 1794 devfs_resolve_name_path( 1795 ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name), 1796 name_buf, &create_path, &name); 1797 1798 if (create_path) 1799 parent = devfs_resolve_or_create_path(parent, create_path, 1); 1800 1801 1802 if (devfs_find_device_node_by_name(parent, name)) { 1803 devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: " 1804 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name); 1805 goto out; 1806 } 1807 1808 node = devfs_allocp(Pdev, name, parent, parent->mp, dev); 1809 nanotime(&parent->mtime); 1810 1811 /* 1812 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their 1813 * directory 1814 */ 1815 if ((dev) && (strlen(dev->si_name) >= 4) && 1816 (!memcmp(dev->si_name, "ptm/", 4))) { 1817 node->parent->flags |= DEVFS_HIDDEN; 1818 node->flags |= DEVFS_HIDDEN; 1819 } 1820 1821 /* 1822 * Ugly pty magic, to tag pty devices as such and hide them if needed. 1823 */ 1824 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3))) 1825 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE); 1826 1827 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) { 1828 found = 0; 1829 for (i = 0; i < strlen(names); i++) { 1830 if (name[3] == names[i]) { 1831 found = 1; 1832 break; 1833 } 1834 } 1835 if (found) 1836 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE); 1837 } 1838 /* hotplug handler */ 1839 if(devfs_node_added) { 1840 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK); 1841 hpdev->dev = node->d_dev; 1842 hpdev->name = node->d_dev->si_name; 1843 devfs_node_added(hpdev); 1844 kfree(hpdev, M_TEMP); 1845 } 1846 1847 out: 1848 kfree(name_buf, M_TEMP); 1849 kvasfree(&path); 1850 return node; 1851 } 1852 1853 /* 1854 * This function finds a given device node in the topology with a given 1855 * cdev. 1856 */ 1857 void * 1858 devfs_find_device_node_callback(struct devfs_node *node, cdev_t target) 1859 { 1860 if ((node->node_type == Pdev) && (node->d_dev == target)) { 1861 return node; 1862 } 1863 1864 return NULL; 1865 } 1866 1867 /* 1868 * This function finds a device node in the given parent directory by its 1869 * name and returns it. 1870 */ 1871 struct devfs_node * 1872 devfs_find_device_node_by_name(struct devfs_node *parent, char *target) 1873 { 1874 struct devfs_node *node, *found = NULL; 1875 size_t len = strlen(target); 1876 1877 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) { 1878 if (len != node->d_dir.d_namlen) 1879 continue; 1880 1881 if (!memcmp(node->d_dir.d_name, target, len)) { 1882 found = node; 1883 break; 1884 } 1885 } 1886 1887 return found; 1888 } 1889 1890 static void * 1891 devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop) 1892 { 1893 struct vnode *vp = NULL; 1894 ino_t target = *inop; 1895 1896 if (node->d_dir.d_ino == target) { 1897 if (node->v_node) { 1898 vp = node->v_node; 1899 vget(vp, LK_EXCLUSIVE | LK_RETRY); 1900 vn_unlock(vp); 1901 } else { 1902 devfs_allocv(&vp, node); 1903 vn_unlock(vp); 1904 } 1905 } 1906 1907 return vp; 1908 } 1909 1910 /* 1911 * This function takes a cdev and removes its devfs node in the 1912 * given topology. The cdev remains intact. 1913 */ 1914 int 1915 devfs_destroy_device_node(struct devfs_node *root, cdev_t target) 1916 { 1917 struct devfs_node *node, *parent; 1918 char *name; 1919 char *name_buf; 1920 char *create_path = NULL; 1921 1922 KKASSERT(target); 1923 1924 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); 1925 ksnprintf(name_buf, PATH_MAX, "%s", target->si_name); 1926 1927 devfs_resolve_name_path(target->si_name, name_buf, &create_path, &name); 1928 1929 if (create_path) 1930 parent = devfs_resolve_or_create_path(root, create_path, 0); 1931 else 1932 parent = root; 1933 1934 if (parent == NULL) { 1935 kfree(name_buf, M_TEMP); 1936 return 1; 1937 } 1938 1939 node = devfs_find_device_node_by_name(parent, name); 1940 1941 if (node) { 1942 nanotime(&node->parent->mtime); 1943 devfs_gc(node); 1944 } 1945 1946 kfree(name_buf, M_TEMP); 1947 1948 return 0; 1949 } 1950 1951 /* 1952 * Just set perms and ownership for given node. 1953 */ 1954 int 1955 devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid, 1956 u_short mode, u_long flags) 1957 { 1958 node->mode = mode; 1959 node->uid = uid; 1960 node->gid = gid; 1961 1962 return 0; 1963 } 1964 1965 /* 1966 * Propagates a device attach/detach to all mount 1967 * points. Also takes care of automatic alias removal 1968 * for a deleted cdev. 1969 */ 1970 static int 1971 devfs_propagate_dev(cdev_t dev, int attach) 1972 { 1973 struct devfs_mnt_data *mnt; 1974 1975 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { 1976 if (attach) { 1977 /* Device is being attached */ 1978 devfs_create_device_node(mnt->root_node, dev, 1979 NULL, NULL ); 1980 } else { 1981 /* Device is being detached */ 1982 devfs_alias_remove(dev); 1983 devfs_destroy_device_node(mnt->root_node, dev); 1984 } 1985 } 1986 return 0; 1987 } 1988 1989 /* 1990 * devfs_clone either returns a basename from a complete name by 1991 * returning the length of the name without trailing digits, or, 1992 * if clone != 0, calls the device's clone handler to get a new 1993 * device, which in turn is returned in devp. 1994 */ 1995 cdev_t 1996 devfs_clone(cdev_t dev, const char *name, size_t len, int mode, 1997 struct ucred *cred) 1998 { 1999 int error; 2000 struct devfs_clone_handler *chandler; 2001 struct dev_clone_args ap; 2002 2003 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) { 2004 if (chandler->namlen != len) 2005 continue; 2006 if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) { 2007 lockmgr(&devfs_lock, LK_RELEASE); 2008 devfs_config(); 2009 lockmgr(&devfs_lock, LK_EXCLUSIVE); 2010 2011 ap.a_head.a_dev = dev; 2012 ap.a_dev = NULL; 2013 ap.a_name = name; 2014 ap.a_namelen = len; 2015 ap.a_mode = mode; 2016 ap.a_cred = cred; 2017 error = (chandler->nhandler)(&ap); 2018 if (error) 2019 continue; 2020 2021 return ap.a_dev; 2022 } 2023 } 2024 2025 return NULL; 2026 } 2027 2028 2029 /* 2030 * Registers a new orphan in the orphan list. 2031 */ 2032 void 2033 devfs_tracer_add_orphan(struct devfs_node *node) 2034 { 2035 struct devfs_orphan *orphan; 2036 2037 KKASSERT(node); 2038 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK); 2039 orphan->node = node; 2040 2041 KKASSERT((node->flags & DEVFS_ORPHANED) == 0); 2042 node->flags |= DEVFS_ORPHANED; 2043 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link); 2044 } 2045 2046 /* 2047 * Removes an orphan from the orphan list. 2048 */ 2049 void 2050 devfs_tracer_del_orphan(struct devfs_node *node) 2051 { 2052 struct devfs_orphan *orphan; 2053 2054 KKASSERT(node); 2055 2056 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) { 2057 if (orphan->node == node) { 2058 node->flags &= ~DEVFS_ORPHANED; 2059 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link); 2060 kfree(orphan, M_DEVFS); 2061 break; 2062 } 2063 } 2064 } 2065 2066 /* 2067 * Counts the orphans in the orphan list, and if cleanup 2068 * is specified, also frees the orphan and removes it from 2069 * the list. 2070 */ 2071 size_t 2072 devfs_tracer_orphan_count(struct mount *mp, int cleanup) 2073 { 2074 struct devfs_orphan *orphan, *orphan2; 2075 size_t count = 0; 2076 2077 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) { 2078 count++; 2079 /* 2080 * If we are instructed to clean up, we do so. 2081 */ 2082 if (cleanup) { 2083 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link); 2084 orphan->node->flags &= ~DEVFS_ORPHANED; 2085 devfs_freep(orphan->node); 2086 kfree(orphan, M_DEVFS); 2087 } 2088 } 2089 2090 return count; 2091 } 2092 2093 /* 2094 * Fetch an ino_t from the global d_ino by increasing it 2095 * while spinlocked. 2096 */ 2097 static ino_t 2098 devfs_fetch_ino(void) 2099 { 2100 ino_t ret; 2101 2102 spin_lock_wr(&ino_lock); 2103 ret = d_ino++; 2104 spin_unlock_wr(&ino_lock); 2105 2106 return ret; 2107 } 2108 2109 /* 2110 * Allocates a new cdev and initializes it's most basic 2111 * fields. 2112 */ 2113 cdev_t 2114 devfs_new_cdev(struct dev_ops *ops, int minor, struct dev_ops *bops) 2115 { 2116 cdev_t dev = sysref_alloc(&cdev_sysref_class); 2117 2118 sysref_activate(&dev->si_sysref); 2119 reference_dev(dev); 2120 bzero(dev, offsetof(struct cdev, si_sysref)); 2121 2122 dev->si_uid = 0; 2123 dev->si_gid = 0; 2124 dev->si_perms = 0; 2125 dev->si_drv1 = NULL; 2126 dev->si_drv2 = NULL; 2127 dev->si_lastread = 0; /* time_second */ 2128 dev->si_lastwrite = 0; /* time_second */ 2129 2130 dev->si_ops = ops; 2131 dev->si_flags = 0; 2132 dev->si_umajor = 0; 2133 dev->si_uminor = minor; 2134 dev->si_bops = bops; 2135 /* If there is a backing device, we reference its ops */ 2136 dev->si_inode = makeudev( 2137 devfs_reference_ops((bops)?(bops):(ops)), 2138 minor ); 2139 2140 return dev; 2141 } 2142 2143 static void 2144 devfs_cdev_terminate(cdev_t dev) 2145 { 2146 int locked = 0; 2147 2148 /* Check if it is locked already. if not, we acquire the devfs lock */ 2149 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) { 2150 lockmgr(&devfs_lock, LK_EXCLUSIVE); 2151 locked = 1; 2152 } 2153 2154 /* Propagate destruction, just in case */ 2155 devfs_propagate_dev(dev, 0); 2156 2157 /* If we acquired the lock, we also get rid of it */ 2158 if (locked) 2159 lockmgr(&devfs_lock, LK_RELEASE); 2160 2161 /* If there is a backing device, we release the backing device's ops */ 2162 devfs_release_ops((dev->si_bops)?(dev->si_bops):(dev->si_ops)); 2163 2164 /* Finally destroy the device */ 2165 sysref_put(&dev->si_sysref); 2166 } 2167 2168 /* 2169 * Dummies for now (individual locks for MPSAFE) 2170 */ 2171 static void 2172 devfs_cdev_lock(cdev_t dev) 2173 { 2174 } 2175 2176 static void 2177 devfs_cdev_unlock(cdev_t dev) 2178 { 2179 } 2180 2181 /* 2182 * Links a given cdev into the dev list. 2183 */ 2184 int 2185 devfs_link_dev(cdev_t dev) 2186 { 2187 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0); 2188 dev->si_flags |= SI_DEVFS_LINKED; 2189 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link); 2190 2191 return 0; 2192 } 2193 2194 /* 2195 * Removes a given cdev from the dev list. The caller is responsible for 2196 * releasing the reference on the device associated with the linkage. 2197 * 2198 * Returns EALREADY if the dev has already been unlinked. 2199 */ 2200 static int 2201 devfs_unlink_dev(cdev_t dev) 2202 { 2203 if ((dev->si_flags & SI_DEVFS_LINKED)) { 2204 TAILQ_REMOVE(&devfs_dev_list, dev, link); 2205 dev->si_flags &= ~SI_DEVFS_LINKED; 2206 return (0); 2207 } 2208 return (EALREADY); 2209 } 2210 2211 int 2212 devfs_node_is_accessible(struct devfs_node *node) 2213 { 2214 if ((node) && (!(node->flags & DEVFS_HIDDEN))) 2215 return 1; 2216 else 2217 return 0; 2218 } 2219 2220 int 2221 devfs_reference_ops(struct dev_ops *ops) 2222 { 2223 int unit; 2224 struct devfs_dev_ops *found = NULL; 2225 struct devfs_dev_ops *devops; 2226 2227 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) { 2228 if (devops->ops == ops) { 2229 found = devops; 2230 break; 2231 } 2232 } 2233 2234 if (!found) { 2235 found = kmalloc(sizeof(struct devfs_dev_ops), M_DEVFS, M_WAITOK); 2236 found->ops = ops; 2237 found->ref_count = 0; 2238 TAILQ_INSERT_TAIL(&devfs_dev_ops_list, found, link); 2239 } 2240 2241 KKASSERT(found); 2242 2243 if (found->ref_count == 0) { 2244 found->id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255); 2245 if (found->id == -1) { 2246 /* Ran out of unique ids */ 2247 devfs_debug(DEVFS_DEBUG_WARNING, 2248 "devfs_reference_ops: WARNING: ran out of unique ids\n"); 2249 } 2250 } 2251 unit = found->id; 2252 ++found->ref_count; 2253 2254 return unit; 2255 } 2256 2257 void 2258 devfs_release_ops(struct dev_ops *ops) 2259 { 2260 struct devfs_dev_ops *found = NULL; 2261 struct devfs_dev_ops *devops; 2262 2263 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) { 2264 if (devops->ops == ops) { 2265 found = devops; 2266 break; 2267 } 2268 } 2269 2270 KKASSERT(found); 2271 2272 --found->ref_count; 2273 2274 if (found->ref_count == 0) { 2275 TAILQ_REMOVE(&devfs_dev_ops_list, found, link); 2276 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), found->id); 2277 kfree(found, M_DEVFS); 2278 } 2279 } 2280 2281 void 2282 devfs_config(void) 2283 { 2284 devfs_msg_t msg; 2285 2286 msg = devfs_msg_get(); 2287 msg = devfs_msg_send_sync(DEVFS_SYNC, msg); 2288 devfs_msg_put(msg); 2289 } 2290 2291 /* 2292 * Called on init of devfs; creates the objcaches and 2293 * spawns off the devfs core thread. Also initializes 2294 * locks. 2295 */ 2296 static void 2297 devfs_init(void) 2298 { 2299 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n"); 2300 /* Create objcaches for nodes, msgs and devs */ 2301 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0, 2302 NULL, NULL, NULL, 2303 objcache_malloc_alloc, 2304 objcache_malloc_free, 2305 &devfs_node_malloc_args ); 2306 2307 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0, 2308 NULL, NULL, NULL, 2309 objcache_malloc_alloc, 2310 objcache_malloc_free, 2311 &devfs_msg_malloc_args ); 2312 2313 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0, 2314 NULL, NULL, NULL, 2315 objcache_malloc_alloc, 2316 objcache_malloc_free, 2317 &devfs_dev_malloc_args ); 2318 2319 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id)); 2320 2321 /* Initialize the reply-only port which acts as a message drain */ 2322 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply); 2323 2324 /* Initialize *THE* devfs lock */ 2325 lockinit(&devfs_lock, "devfs_core lock", 0, 0); 2326 2327 2328 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL, 2329 0, 0, "devfs_msg_core"); 2330 2331 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0); 2332 2333 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n"); 2334 } 2335 2336 /* 2337 * Called on unload of devfs; takes care of destroying the core 2338 * and the objcaches. Also removes aliases that are no longer needed. 2339 */ 2340 static void 2341 devfs_uninit(void) 2342 { 2343 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n"); 2344 2345 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL); 2346 2347 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0); 2348 tsleep(td_core/*devfs_id*/, 0, "devfsc", 10000); 2349 2350 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id)); 2351 2352 /* Destroy the objcaches */ 2353 objcache_destroy(devfs_msg_cache); 2354 objcache_destroy(devfs_node_cache); 2355 objcache_destroy(devfs_dev_cache); 2356 2357 devfs_alias_reap(); 2358 } 2359 2360 /* 2361 * This is a sysctl handler to assist userland devname(3) to 2362 * find the device name for a given udev. 2363 */ 2364 static int 2365 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS) 2366 { 2367 udev_t udev; 2368 cdev_t found; 2369 int error; 2370 2371 2372 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t)))) 2373 return (error); 2374 2375 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev); 2376 2377 if (udev == NOUDEV) 2378 return(EINVAL); 2379 2380 if ((found = devfs_find_device_by_udev(udev)) == NULL) 2381 return(ENOENT); 2382 2383 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1)); 2384 } 2385 2386 2387 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY, 2388 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)"); 2389 2390 SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs"); 2391 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable); 2392 SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable, 2393 0, "Enable DevFS debugging"); 2394 2395 SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, 2396 devfs_init, NULL); 2397 SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, 2398 devfs_uninit, NULL); 2399