| 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/sysctl.h> |
| 43 | #include <sys/ucred.h> |
| 44 | #include <sys/param.h> |
| 45 | #include <sys/systm.h> |
| 46 | #include <sys/devfs.h> |
| 47 | #include <sys/devfs_rules.h> |
| 48 | #include <sys/udev.h> |
| 49 | |
| 50 | #include <sys/msgport2.h> |
| 51 | #include <sys/spinlock2.h> |
| 52 | #include <sys/mplock2.h> |
| 53 | #include <sys/sysref2.h> |
| 54 | |
| 55 | MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations"); |
| 56 | DEVFS_DECLARE_CLONE_BITMAP(ops_id); |
| 57 | /* |
| 58 | * SYSREF Integration - reference counting, allocation, |
| 59 | * sysid and syslink integration. |
| 60 | */ |
| 61 | static void devfs_cdev_terminate(cdev_t dev); |
| 62 | static void devfs_cdev_lock(cdev_t dev); |
| 63 | static void devfs_cdev_unlock(cdev_t dev); |
| 64 | static struct sysref_class cdev_sysref_class = { |
| 65 | .name = "cdev", |
| 66 | .mtype = M_DEVFS, |
| 67 | .proto = SYSREF_PROTO_DEV, |
| 68 | .offset = offsetof(struct cdev, si_sysref), |
| 69 | .objsize = sizeof(struct cdev), |
| 70 | .mag_capacity = 32, |
| 71 | .flags = 0, |
| 72 | .ops = { |
| 73 | .terminate = (sysref_terminate_func_t)devfs_cdev_terminate, |
| 74 | .lock = (sysref_lock_func_t)devfs_cdev_lock, |
| 75 | .unlock = (sysref_unlock_func_t)devfs_cdev_unlock |
| 76 | } |
| 77 | }; |
| 78 | |
| 79 | static struct objcache *devfs_node_cache; |
| 80 | static struct objcache *devfs_msg_cache; |
| 81 | static struct objcache *devfs_dev_cache; |
| 82 | |
| 83 | static struct objcache_malloc_args devfs_node_malloc_args = { |
| 84 | sizeof(struct devfs_node), M_DEVFS }; |
| 85 | struct objcache_malloc_args devfs_msg_malloc_args = { |
| 86 | sizeof(struct devfs_msg), M_DEVFS }; |
| 87 | struct objcache_malloc_args devfs_dev_malloc_args = { |
| 88 | sizeof(struct cdev), M_DEVFS }; |
| 89 | |
| 90 | static struct devfs_dev_head devfs_dev_list = |
| 91 | TAILQ_HEAD_INITIALIZER(devfs_dev_list); |
| 92 | static struct devfs_mnt_head devfs_mnt_list = |
| 93 | TAILQ_HEAD_INITIALIZER(devfs_mnt_list); |
| 94 | static struct devfs_chandler_head devfs_chandler_list = |
| 95 | TAILQ_HEAD_INITIALIZER(devfs_chandler_list); |
| 96 | static struct devfs_alias_head devfs_alias_list = |
| 97 | TAILQ_HEAD_INITIALIZER(devfs_alias_list); |
| 98 | static struct devfs_dev_ops_head devfs_dev_ops_list = |
| 99 | TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list); |
| 100 | |
| 101 | struct lock devfs_lock; |
| 102 | static struct lwkt_port devfs_dispose_port; |
| 103 | static struct lwkt_port devfs_msg_port; |
| 104 | static struct thread *td_core; |
| 105 | |
| 106 | static struct spinlock ino_lock; |
| 107 | static ino_t d_ino; |
| 108 | static int devfs_debug_enable; |
| 109 | static int devfs_run; |
| 110 | |
| 111 | static ino_t devfs_fetch_ino(void); |
| 112 | static int devfs_create_all_dev_worker(struct devfs_node *); |
| 113 | static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int); |
| 114 | static int devfs_destroy_dev_worker(cdev_t); |
| 115 | static int devfs_destroy_subnames_worker(char *); |
| 116 | static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int); |
| 117 | static int devfs_propagate_dev(cdev_t, int); |
| 118 | static int devfs_unlink_dev(cdev_t dev); |
| 119 | static void devfs_msg_exec(devfs_msg_t msg); |
| 120 | |
| 121 | static int devfs_chandler_add_worker(const char *, d_clone_t *); |
| 122 | static int devfs_chandler_del_worker(const char *); |
| 123 | |
| 124 | static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t); |
| 125 | static void devfs_msg_core(void *); |
| 126 | |
| 127 | static int devfs_find_device_by_name_worker(devfs_msg_t); |
| 128 | static int devfs_find_device_by_udev_worker(devfs_msg_t); |
| 129 | |
| 130 | static int devfs_apply_reset_rules_caller(char *, int); |
| 131 | |
| 132 | static int devfs_scan_callback_worker(devfs_scan_t *, void *); |
| 133 | |
| 134 | static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *, |
| 135 | char *, size_t, int); |
| 136 | |
| 137 | static int devfs_make_alias_worker(struct devfs_alias *); |
| 138 | static int devfs_destroy_alias_worker(struct devfs_alias *); |
| 139 | static int devfs_alias_remove(cdev_t); |
| 140 | static int devfs_alias_reap(void); |
| 141 | static int devfs_alias_propagate(struct devfs_alias *, int); |
| 142 | static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *); |
| 143 | static int devfs_alias_check_create(struct devfs_node *); |
| 144 | |
| 145 | static int devfs_clr_subnames_flag_worker(char *, uint32_t); |
| 146 | static int devfs_destroy_subnames_without_flag_worker(char *, uint32_t); |
| 147 | |
| 148 | static void *devfs_reaperp_callback(struct devfs_node *, void *); |
| 149 | static void *devfs_gc_dirs_callback(struct devfs_node *, void *); |
| 150 | static void *devfs_gc_links_callback(struct devfs_node *, struct devfs_node *); |
| 151 | static void * |
| 152 | devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *); |
| 153 | |
| 154 | /* |
| 155 | * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function |
| 156 | * using kvprintf |
| 157 | */ |
| 158 | int |
| 159 | devfs_debug(int level, char *fmt, ...) |
| 160 | { |
| 161 | __va_list ap; |
| 162 | |
| 163 | __va_start(ap, fmt); |
| 164 | if (level <= devfs_debug_enable) |
| 165 | kvprintf(fmt, ap); |
| 166 | __va_end(ap); |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * devfs_allocp() Allocates a new devfs node with the specified |
| 173 | * parameters. The node is also automatically linked into the topology |
| 174 | * if a parent is specified. It also calls the rule and alias stuff to |
| 175 | * be applied on the new node |
| 176 | */ |
| 177 | struct devfs_node * |
| 178 | devfs_allocp(devfs_nodetype devfsnodetype, char *name, |
| 179 | struct devfs_node *parent, struct mount *mp, cdev_t dev) |
| 180 | { |
| 181 | struct devfs_node *node = NULL; |
| 182 | size_t namlen = strlen(name); |
| 183 | |
| 184 | node = objcache_get(devfs_node_cache, M_WAITOK); |
| 185 | bzero(node, sizeof(*node)); |
| 186 | |
| 187 | atomic_add_long(&DEVFS_MNTDATA(mp)->leak_count, 1); |
| 188 | |
| 189 | node->d_dev = NULL; |
| 190 | node->nchildren = 1; |
| 191 | node->mp = mp; |
| 192 | node->d_dir.d_ino = devfs_fetch_ino(); |
| 193 | |
| 194 | /* |
| 195 | * Cookie jar for children. Leave 0 and 1 for '.' and '..' entries |
| 196 | * respectively. |
| 197 | */ |
| 198 | node->cookie_jar = 2; |
| 199 | |
| 200 | /* |
| 201 | * Access Control members |
| 202 | */ |
| 203 | node->mode = DEVFS_DEFAULT_MODE; |
| 204 | node->uid = DEVFS_DEFAULT_UID; |
| 205 | node->gid = DEVFS_DEFAULT_GID; |
| 206 | |
| 207 | switch (devfsnodetype) { |
| 208 | case Proot: |
| 209 | /* |
| 210 | * Ensure that we don't recycle the root vnode by marking it as |
| 211 | * linked into the topology. |
| 212 | */ |
| 213 | node->flags |= DEVFS_NODE_LINKED; |
| 214 | case Pdir: |
| 215 | TAILQ_INIT(DEVFS_DENODE_HEAD(node)); |
| 216 | node->d_dir.d_type = DT_DIR; |
| 217 | node->nchildren = 2; |
| 218 | break; |
| 219 | |
| 220 | case Plink: |
| 221 | node->d_dir.d_type = DT_LNK; |
| 222 | break; |
| 223 | |
| 224 | case Preg: |
| 225 | node->d_dir.d_type = DT_REG; |
| 226 | break; |
| 227 | |
| 228 | case Pdev: |
| 229 | if (dev != NULL) { |
| 230 | node->d_dir.d_type = DT_CHR; |
| 231 | node->d_dev = dev; |
| 232 | |
| 233 | node->mode = dev->si_perms; |
| 234 | node->uid = dev->si_uid; |
| 235 | node->gid = dev->si_gid; |
| 236 | |
| 237 | devfs_alias_check_create(node); |
| 238 | } |
| 239 | break; |
| 240 | |
| 241 | default: |
| 242 | panic("devfs_allocp: unknown node type"); |
| 243 | } |
| 244 | |
| 245 | node->v_node = NULL; |
| 246 | node->node_type = devfsnodetype; |
| 247 | |
| 248 | /* Initialize the dirent structure of each devfs vnode */ |
| 249 | node->d_dir.d_namlen = namlen; |
| 250 | node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK); |
| 251 | memcpy(node->d_dir.d_name, name, namlen); |
| 252 | node->d_dir.d_name[namlen] = '\0'; |
| 253 | |
| 254 | /* Initialize the parent node element */ |
| 255 | node->parent = parent; |
| 256 | |
| 257 | /* Apply rules */ |
| 258 | devfs_rule_check_apply(node, NULL); |
| 259 | |
| 260 | /* Initialize *time members */ |
| 261 | nanotime(&node->atime); |
| 262 | node->mtime = node->ctime = node->atime; |
| 263 | |
| 264 | /* |
| 265 | * Associate with parent as last step, clean out namecache |
| 266 | * reference. |
| 267 | */ |
| 268 | if ((parent != NULL) && |
| 269 | ((parent->node_type == Proot) || (parent->node_type == Pdir))) { |
| 270 | parent->nchildren++; |
| 271 | node->cookie = parent->cookie_jar++; |
| 272 | node->flags |= DEVFS_NODE_LINKED; |
| 273 | TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link); |
| 274 | |
| 275 | /* This forces negative namecache lookups to clear */ |
| 276 | ++mp->mnt_namecache_gen; |
| 277 | } |
| 278 | |
| 279 | atomic_add_long(&DEVFS_MNTDATA(mp)->file_count, 1); |
| 280 | |
| 281 | return node; |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * devfs_allocv() allocates a new vnode based on a devfs node. |
| 286 | */ |
| 287 | int |
| 288 | devfs_allocv(struct vnode **vpp, struct devfs_node *node) |
| 289 | { |
| 290 | struct vnode *vp; |
| 291 | int error = 0; |
| 292 | |
| 293 | KKASSERT(node); |
| 294 | |
| 295 | try_again: |
| 296 | while ((vp = node->v_node) != NULL) { |
| 297 | error = vget(vp, LK_EXCLUSIVE); |
| 298 | if (error != ENOENT) { |
| 299 | *vpp = vp; |
| 300 | goto out; |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0) |
| 305 | goto out; |
| 306 | |
| 307 | vp = *vpp; |
| 308 | |
| 309 | if (node->v_node != NULL) { |
| 310 | vp->v_type = VBAD; |
| 311 | vx_put(vp); |
| 312 | goto try_again; |
| 313 | } |
| 314 | |
| 315 | vp->v_data = node; |
| 316 | node->v_node = vp; |
| 317 | |
| 318 | switch (node->node_type) { |
| 319 | case Proot: |
| 320 | vsetflags(vp, VROOT); |
| 321 | /* fall through */ |
| 322 | case Pdir: |
| 323 | vp->v_type = VDIR; |
| 324 | break; |
| 325 | |
| 326 | case Plink: |
| 327 | vp->v_type = VLNK; |
| 328 | break; |
| 329 | |
| 330 | case Preg: |
| 331 | vp->v_type = VREG; |
| 332 | break; |
| 333 | |
| 334 | case Pdev: |
| 335 | vp->v_type = VCHR; |
| 336 | KKASSERT(node->d_dev); |
| 337 | |
| 338 | vp->v_uminor = node->d_dev->si_uminor; |
| 339 | vp->v_umajor = 0; |
| 340 | |
| 341 | v_associate_rdev(vp, node->d_dev); |
| 342 | vp->v_ops = &node->mp->mnt_vn_spec_ops; |
| 343 | break; |
| 344 | |
| 345 | default: |
| 346 | panic("devfs_allocv: unknown node type"); |
| 347 | } |
| 348 | |
| 349 | out: |
| 350 | return error; |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode |
| 355 | * based on the newly created devfs node. |
| 356 | */ |
| 357 | int |
| 358 | devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype, |
| 359 | char *name, struct devfs_node *parent, cdev_t dev) |
| 360 | { |
| 361 | struct devfs_node *node; |
| 362 | |
| 363 | node = devfs_allocp(devfsnodetype, name, parent, mp, dev); |
| 364 | |
| 365 | if (node != NULL) |
| 366 | devfs_allocv(vpp, node); |
| 367 | else |
| 368 | *vpp = NULL; |
| 369 | |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Destroy the devfs_node. The node must be unlinked from the topology. |
| 375 | * |
| 376 | * This function will also destroy any vnode association with the node |
| 377 | * and device. |
| 378 | * |
| 379 | * The cdev_t itself remains intact. |
| 380 | * |
| 381 | * The core lock is not necessarily held on call and must be temporarily |
| 382 | * released if it is to avoid a deadlock. |
| 383 | */ |
| 384 | int |
| 385 | devfs_freep(struct devfs_node *node) |
| 386 | { |
| 387 | struct vnode *vp; |
| 388 | int relock; |
| 389 | |
| 390 | KKASSERT(node); |
| 391 | KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) || |
| 392 | (node->node_type == Proot)); |
| 393 | |
| 394 | /* |
| 395 | * Protect against double frees |
| 396 | */ |
| 397 | KKASSERT((node->flags & DEVFS_DESTROYED) == 0); |
| 398 | node->flags |= DEVFS_DESTROYED; |
| 399 | |
| 400 | /* |
| 401 | * Avoid deadlocks between devfs_lock and the vnode lock when |
| 402 | * disassociating the vnode (stress2 pty vs ls -la /dev/pts). |
| 403 | * |
| 404 | * This also prevents the vnode reclaim code from double-freeing |
| 405 | * the node. The vget() is required to safely modified the vp |
| 406 | * and cycle the refs to terminate an inactive vp. |
| 407 | */ |
| 408 | if (lockstatus(&devfs_lock, curthread) == LK_EXCLUSIVE) { |
| 409 | lockmgr(&devfs_lock, LK_RELEASE); |
| 410 | relock = 1; |
| 411 | } else { |
| 412 | relock = 0; |
| 413 | } |
| 414 | |
| 415 | while ((vp = node->v_node) != NULL) { |
| 416 | if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0) |
| 417 | break; |
| 418 | v_release_rdev(vp); |
| 419 | vp->v_data = NULL; |
| 420 | node->v_node = NULL; |
| 421 | cache_inval_vp(vp, CINV_DESTROY); |
| 422 | vput(vp); |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * Remaining cleanup |
| 427 | */ |
| 428 | atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->leak_count, 1); |
| 429 | if (node->symlink_name) { |
| 430 | kfree(node->symlink_name, M_DEVFS); |
| 431 | node->symlink_name = NULL; |
| 432 | } |
| 433 | |
| 434 | /* |
| 435 | * Remove the node from the orphan list if it is still on it. |
| 436 | */ |
| 437 | if (node->flags & DEVFS_ORPHANED) |
| 438 | devfs_tracer_del_orphan(node); |
| 439 | |
| 440 | if (node->d_dir.d_name) { |
| 441 | kfree(node->d_dir.d_name, M_DEVFS); |
| 442 | node->d_dir.d_name = NULL; |
| 443 | } |
| 444 | atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->file_count, 1); |
| 445 | objcache_put(devfs_node_cache, node); |
| 446 | |
| 447 | if (relock) |
| 448 | lockmgr(&devfs_lock, LK_EXCLUSIVE); |
| 449 | |
| 450 | return 0; |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * Unlink the devfs node from the topology and add it to the orphan list. |
| 455 | * The node will later be destroyed by freep. |
| 456 | * |
| 457 | * Any vnode association, including the v_rdev and v_data, remains intact |
| 458 | * until the freep. |
| 459 | */ |
| 460 | int |
| 461 | devfs_unlinkp(struct devfs_node *node) |
| 462 | { |
| 463 | struct devfs_node *parent; |
| 464 | KKASSERT(node); |
| 465 | |
| 466 | /* |
| 467 | * Add the node to the orphan list, so it is referenced somewhere, to |
| 468 | * so we don't leak it. |
| 469 | */ |
| 470 | devfs_tracer_add_orphan(node); |
| 471 | |
| 472 | parent = node->parent; |
| 473 | |
| 474 | /* |
| 475 | * If the parent is known we can unlink the node out of the topology |
| 476 | */ |
| 477 | if (parent) { |
| 478 | TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link); |
| 479 | parent->nchildren--; |
| 480 | node->flags &= ~DEVFS_NODE_LINKED; |
| 481 | } |
| 482 | |
| 483 | node->parent = NULL; |
| 484 | return 0; |
| 485 | } |
| 486 | |
| 487 | void * |
| 488 | devfs_iterate_topology(struct devfs_node *node, |
| 489 | devfs_iterate_callback_t *callback, void *arg1) |
| 490 | { |
| 491 | struct devfs_node *node1, *node2; |
| 492 | void *ret = NULL; |
| 493 | |
| 494 | if ((node->node_type == Proot) || (node->node_type == Pdir)) { |
| 495 | if (node->nchildren > 2) { |
| 496 | TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), |
| 497 | link, node2) { |
| 498 | if ((ret = devfs_iterate_topology(node1, callback, arg1))) |
| 499 | return ret; |
| 500 | } |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | ret = callback(node, arg1); |
| 505 | return ret; |
| 506 | } |
| 507 | |
| 508 | /* |
| 509 | * devfs_reaperp() is a recursive function that iterates through all the |
| 510 | * topology, unlinking and freeing all devfs nodes. |
| 511 | */ |
| 512 | static void * |
| 513 | devfs_reaperp_callback(struct devfs_node *node, void *unused) |
| 514 | { |
| 515 | devfs_unlinkp(node); |
| 516 | devfs_freep(node); |
| 517 | |
| 518 | return NULL; |
| 519 | } |
| 520 | |
| 521 | static void * |
| 522 | devfs_gc_dirs_callback(struct devfs_node *node, void *unused) |
| 523 | { |
| 524 | if (node->node_type == Pdir) { |
| 525 | if ((node->nchildren == 2) && |
| 526 | !(node->flags & DEVFS_USER_CREATED)) { |
| 527 | devfs_unlinkp(node); |
| 528 | devfs_freep(node); |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | return NULL; |
| 533 | } |
| 534 | |
| 535 | static void * |
| 536 | devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target) |
| 537 | { |
| 538 | if ((node->node_type == Plink) && (node->link_target == target)) { |
| 539 | devfs_unlinkp(node); |
| 540 | devfs_freep(node); |
| 541 | } |
| 542 | |
| 543 | return NULL; |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * devfs_gc() is devfs garbage collector. It takes care of unlinking and |
| 548 | * freeing a node, but also removes empty directories and links that link |
| 549 | * via devfs auto-link mechanism to the node being deleted. |
| 550 | */ |
| 551 | int |
| 552 | devfs_gc(struct devfs_node *node) |
| 553 | { |
| 554 | struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node; |
| 555 | |
| 556 | if (node->nlinks > 0) |
| 557 | devfs_iterate_topology(root_node, |
| 558 | (devfs_iterate_callback_t *)devfs_gc_links_callback, node); |
| 559 | |
| 560 | devfs_unlinkp(node); |
| 561 | devfs_iterate_topology(root_node, |
| 562 | (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL); |
| 563 | |
| 564 | devfs_freep(node); |
| 565 | |
| 566 | return 0; |
| 567 | } |
| 568 | |
| 569 | /* |
| 570 | * devfs_create_dev() is the asynchronous entry point for device creation. |
| 571 | * It just sends a message with the relevant details to the devfs core. |
| 572 | * |
| 573 | * This function will reference the passed device. The reference is owned |
| 574 | * by devfs and represents all of the device's node associations. |
| 575 | */ |
| 576 | int |
| 577 | devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms) |
| 578 | { |
| 579 | reference_dev(dev); |
| 580 | devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms); |
| 581 | |
| 582 | return 0; |
| 583 | } |
| 584 | |
| 585 | /* |
| 586 | * devfs_destroy_dev() is the asynchronous entry point for device destruction. |
| 587 | * It just sends a message with the relevant details to the devfs core. |
| 588 | */ |
| 589 | int |
| 590 | devfs_destroy_dev(cdev_t dev) |
| 591 | { |
| 592 | devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0); |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | /* |
| 597 | * devfs_mount_add() is the synchronous entry point for adding a new devfs |
| 598 | * mount. It sends a synchronous message with the relevant details to the |
| 599 | * devfs core. |
| 600 | */ |
| 601 | int |
| 602 | devfs_mount_add(struct devfs_mnt_data *mnt) |
| 603 | { |
| 604 | devfs_msg_t msg; |
| 605 | |
| 606 | msg = devfs_msg_get(); |
| 607 | msg->mdv_mnt = mnt; |
| 608 | msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg); |
| 609 | devfs_msg_put(msg); |
| 610 | |
| 611 | return 0; |
| 612 | } |
| 613 | |
| 614 | /* |
| 615 | * devfs_mount_del() is the synchronous entry point for removing a devfs mount. |
| 616 | * It sends a synchronous message with the relevant details to the devfs core. |
| 617 | */ |
| 618 | int |
| 619 | devfs_mount_del(struct devfs_mnt_data *mnt) |
| 620 | { |
| 621 | devfs_msg_t msg; |
| 622 | |
| 623 | msg = devfs_msg_get(); |
| 624 | msg->mdv_mnt = mnt; |
| 625 | msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg); |
| 626 | devfs_msg_put(msg); |
| 627 | |
| 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | /* |
| 632 | * devfs_destroy_subnames() is the synchronous entry point for device |
| 633 | * destruction by subname. It just sends a message with the relevant details to |
| 634 | * the devfs core. |
| 635 | */ |
| 636 | int |
| 637 | devfs_destroy_subnames(char *name) |
| 638 | { |
| 639 | devfs_msg_t msg; |
| 640 | |
| 641 | msg = devfs_msg_get(); |
| 642 | msg->mdv_load = name; |
| 643 | msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES, msg); |
| 644 | devfs_msg_put(msg); |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | int |
| 649 | devfs_clr_subnames_flag(char *name, uint32_t flag) |
| 650 | { |
| 651 | devfs_msg_t msg; |
| 652 | |
| 653 | msg = devfs_msg_get(); |
| 654 | msg->mdv_flags.name = name; |
| 655 | msg->mdv_flags.flag = flag; |
| 656 | msg = devfs_msg_send_sync(DEVFS_CLR_SUBNAMES_FLAG, msg); |
| 657 | devfs_msg_put(msg); |
| 658 | |
| 659 | return 0; |
| 660 | } |
| 661 | |
| 662 | int |
| 663 | devfs_destroy_subnames_without_flag(char *name, uint32_t flag) |
| 664 | { |
| 665 | devfs_msg_t msg; |
| 666 | |
| 667 | msg = devfs_msg_get(); |
| 668 | msg->mdv_flags.name = name; |
| 669 | msg->mdv_flags.flag = flag; |
| 670 | msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES_WO_FLAG, msg); |
| 671 | devfs_msg_put(msg); |
| 672 | |
| 673 | return 0; |
| 674 | } |
| 675 | |
| 676 | /* |
| 677 | * devfs_create_all_dev is the asynchronous entry point to trigger device |
| 678 | * node creation. It just sends a message with the relevant details to |
| 679 | * the devfs core. |
| 680 | */ |
| 681 | int |
| 682 | devfs_create_all_dev(struct devfs_node *root) |
| 683 | { |
| 684 | devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root); |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | /* |
| 689 | * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all |
| 690 | * devices with a specific set of dev_ops and minor. It just sends a |
| 691 | * message with the relevant details to the devfs core. |
| 692 | */ |
| 693 | int |
| 694 | devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor) |
| 695 | { |
| 696 | devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor); |
| 697 | return 0; |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * devfs_clone_handler_add is the synchronous entry point to add a new |
| 702 | * clone handler. It just sends a message with the relevant details to |
| 703 | * the devfs core. |
| 704 | */ |
| 705 | int |
| 706 | devfs_clone_handler_add(const char *name, d_clone_t *nhandler) |
| 707 | { |
| 708 | devfs_msg_t msg; |
| 709 | |
| 710 | msg = devfs_msg_get(); |
| 711 | msg->mdv_chandler.name = name; |
| 712 | msg->mdv_chandler.nhandler = nhandler; |
| 713 | msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg); |
| 714 | devfs_msg_put(msg); |
| 715 | return 0; |
| 716 | } |
| 717 | |
| 718 | /* |
| 719 | * devfs_clone_handler_del is the synchronous entry point to remove a |
| 720 | * clone handler. It just sends a message with the relevant details to |
| 721 | * the devfs core. |
| 722 | */ |
| 723 | int |
| 724 | devfs_clone_handler_del(const char *name) |
| 725 | { |
| 726 | devfs_msg_t msg; |
| 727 | |
| 728 | msg = devfs_msg_get(); |
| 729 | msg->mdv_chandler.name = name; |
| 730 | msg->mdv_chandler.nhandler = NULL; |
| 731 | msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg); |
| 732 | devfs_msg_put(msg); |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 736 | /* |
| 737 | * devfs_find_device_by_name is the synchronous entry point to find a |
| 738 | * device given its name. It sends a synchronous message with the |
| 739 | * relevant details to the devfs core and returns the answer. |
| 740 | */ |
| 741 | cdev_t |
| 742 | devfs_find_device_by_name(const char *fmt, ...) |
| 743 | { |
| 744 | cdev_t found = NULL; |
| 745 | devfs_msg_t msg; |
| 746 | char *target; |
| 747 | __va_list ap; |
| 748 | |
| 749 | if (fmt == NULL) |
| 750 | return NULL; |
| 751 | |
| 752 | __va_start(ap, fmt); |
| 753 | kvasnrprintf(&target, PATH_MAX, 10, fmt, ap); |
| 754 | __va_end(ap); |
| 755 | |
| 756 | msg = devfs_msg_get(); |
| 757 | msg->mdv_name = target; |
| 758 | msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg); |
| 759 | found = msg->mdv_cdev; |
| 760 | devfs_msg_put(msg); |
| 761 | kvasfree(&target); |
| 762 | |
| 763 | return found; |
| 764 | } |
| 765 | |
| 766 | /* |
| 767 | * devfs_find_device_by_udev is the synchronous entry point to find a |
| 768 | * device given its udev number. It sends a synchronous message with |
| 769 | * the relevant details to the devfs core and returns the answer. |
| 770 | */ |
| 771 | cdev_t |
| 772 | devfs_find_device_by_udev(udev_t udev) |
| 773 | { |
| 774 | cdev_t found = NULL; |
| 775 | devfs_msg_t msg; |
| 776 | |
| 777 | msg = devfs_msg_get(); |
| 778 | msg->mdv_udev = udev; |
| 779 | msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg); |
| 780 | found = msg->mdv_cdev; |
| 781 | devfs_msg_put(msg); |
| 782 | |
| 783 | devfs_debug(DEVFS_DEBUG_DEBUG, |
| 784 | "devfs_find_device_by_udev found? %s -end:3-\n", |
| 785 | ((found) ? found->si_name:"NO")); |
| 786 | return found; |
| 787 | } |
| 788 | |
| 789 | struct vnode * |
| 790 | devfs_inode_to_vnode(struct mount *mp, ino_t target) |
| 791 | { |
| 792 | struct vnode *vp = NULL; |
| 793 | devfs_msg_t msg; |
| 794 | |
| 795 | if (mp == NULL) |
| 796 | return NULL; |
| 797 | |
| 798 | msg = devfs_msg_get(); |
| 799 | msg->mdv_ino.mp = mp; |
| 800 | msg->mdv_ino.ino = target; |
| 801 | msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg); |
| 802 | vp = msg->mdv_ino.vp; |
| 803 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 804 | devfs_msg_put(msg); |
| 805 | |
| 806 | return vp; |
| 807 | } |
| 808 | |
| 809 | /* |
| 810 | * devfs_make_alias is the asynchronous entry point to register an alias |
| 811 | * for a device. It just sends a message with the relevant details to the |
| 812 | * devfs core. |
| 813 | */ |
| 814 | int |
| 815 | devfs_make_alias(const char *name, cdev_t dev_target) |
| 816 | { |
| 817 | struct devfs_alias *alias; |
| 818 | size_t len; |
| 819 | |
| 820 | len = strlen(name); |
| 821 | |
| 822 | alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK); |
| 823 | alias->name = kstrdup(name, M_DEVFS); |
| 824 | alias->namlen = len; |
| 825 | alias->dev_target = dev_target; |
| 826 | |
| 827 | devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias); |
| 828 | return 0; |
| 829 | } |
| 830 | |
| 831 | /* |
| 832 | * devfs_destroy_alias is the asynchronous entry point to deregister an alias |
| 833 | * for a device. It just sends a message with the relevant details to the |
| 834 | * devfs core. |
| 835 | */ |
| 836 | int |
| 837 | devfs_destroy_alias(const char *name, cdev_t dev_target) |
| 838 | { |
| 839 | struct devfs_alias *alias; |
| 840 | size_t len; |
| 841 | |
| 842 | len = strlen(name); |
| 843 | |
| 844 | alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK); |
| 845 | alias->name = kstrdup(name, M_DEVFS); |
| 846 | alias->namlen = len; |
| 847 | alias->dev_target = dev_target; |
| 848 | |
| 849 | devfs_msg_send_generic(DEVFS_DESTROY_ALIAS, alias); |
| 850 | return 0; |
| 851 | } |
| 852 | |
| 853 | /* |
| 854 | * devfs_apply_rules is the asynchronous entry point to trigger application |
| 855 | * of all rules. It just sends a message with the relevant details to the |
| 856 | * devfs core. |
| 857 | */ |
| 858 | int |
| 859 | devfs_apply_rules(char *mntto) |
| 860 | { |
| 861 | char *new_name; |
| 862 | |
| 863 | new_name = kstrdup(mntto, M_DEVFS); |
| 864 | devfs_msg_send_name(DEVFS_APPLY_RULES, new_name); |
| 865 | |
| 866 | return 0; |
| 867 | } |
| 868 | |
| 869 | /* |
| 870 | * devfs_reset_rules is the asynchronous entry point to trigger reset of all |
| 871 | * rules. It just sends a message with the relevant details to the devfs core. |
| 872 | */ |
| 873 | int |
| 874 | devfs_reset_rules(char *mntto) |
| 875 | { |
| 876 | char *new_name; |
| 877 | |
| 878 | new_name = kstrdup(mntto, M_DEVFS); |
| 879 | devfs_msg_send_name(DEVFS_RESET_RULES, new_name); |
| 880 | |
| 881 | return 0; |
| 882 | } |
| 883 | |
| 884 | |
| 885 | /* |
| 886 | * devfs_scan_callback is the asynchronous entry point to call a callback |
| 887 | * on all cdevs. |
| 888 | * It just sends a message with the relevant details to the devfs core. |
| 889 | */ |
| 890 | int |
| 891 | devfs_scan_callback(devfs_scan_t *callback, void *arg) |
| 892 | { |
| 893 | devfs_msg_t msg; |
| 894 | |
| 895 | KKASSERT(sizeof(callback) == sizeof(void *)); |
| 896 | |
| 897 | msg = devfs_msg_get(); |
| 898 | msg->mdv_load = callback; |
| 899 | msg->mdv_load2 = arg; |
| 900 | msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg); |
| 901 | devfs_msg_put(msg); |
| 902 | |
| 903 | return 0; |
| 904 | } |
| 905 | |
| 906 | |
| 907 | /* |
| 908 | * Acts as a message drain. Any message that is replied to here gets destroyed |
| 909 | * and the memory freed. |
| 910 | */ |
| 911 | static void |
| 912 | devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg) |
| 913 | { |
| 914 | devfs_msg_put((devfs_msg_t)msg); |
| 915 | } |
| 916 | |
| 917 | /* |
| 918 | * devfs_msg_get allocates a new devfs msg and returns it. |
| 919 | */ |
| 920 | devfs_msg_t |
| 921 | devfs_msg_get(void) |
| 922 | { |
| 923 | return objcache_get(devfs_msg_cache, M_WAITOK); |
| 924 | } |
| 925 | |
| 926 | /* |
| 927 | * devfs_msg_put deallocates a given devfs msg. |
| 928 | */ |
| 929 | int |
| 930 | devfs_msg_put(devfs_msg_t msg) |
| 931 | { |
| 932 | objcache_put(devfs_msg_cache, msg); |
| 933 | return 0; |
| 934 | } |
| 935 | |
| 936 | /* |
| 937 | * devfs_msg_send is the generic asynchronous message sending facility |
| 938 | * for devfs. By default the reply port is the automatic disposal port. |
| 939 | * |
| 940 | * If the current thread is the devfs_msg_port thread we execute the |
| 941 | * operation synchronously. |
| 942 | */ |
| 943 | void |
| 944 | devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg) |
| 945 | { |
| 946 | lwkt_port_t port = &devfs_msg_port; |
| 947 | |
| 948 | lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0); |
| 949 | |
| 950 | devfs_msg->hdr.u.ms_result = cmd; |
| 951 | |
| 952 | if (port->mpu_td == curthread) { |
| 953 | devfs_msg_exec(devfs_msg); |
| 954 | lwkt_replymsg(&devfs_msg->hdr, 0); |
| 955 | } else { |
| 956 | lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg); |
| 957 | } |
| 958 | } |
| 959 | |
| 960 | /* |
| 961 | * devfs_msg_send_sync is the generic synchronous message sending |
| 962 | * facility for devfs. It initializes a local reply port and waits |
| 963 | * for the core's answer. This answer is then returned. |
| 964 | */ |
| 965 | devfs_msg_t |
| 966 | devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg) |
| 967 | { |
| 968 | struct lwkt_port rep_port; |
| 969 | devfs_msg_t msg_incoming; |
| 970 | lwkt_port_t port = &devfs_msg_port; |
| 971 | |
| 972 | lwkt_initport_thread(&rep_port, curthread); |
| 973 | lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0); |
| 974 | |
| 975 | devfs_msg->hdr.u.ms_result = cmd; |
| 976 | |
| 977 | lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg); |
| 978 | msg_incoming = lwkt_waitport(&rep_port, 0); |
| 979 | |
| 980 | return msg_incoming; |
| 981 | } |
| 982 | |
| 983 | /* |
| 984 | * sends a message with a generic argument. |
| 985 | */ |
| 986 | void |
| 987 | devfs_msg_send_generic(uint32_t cmd, void *load) |
| 988 | { |
| 989 | devfs_msg_t devfs_msg = devfs_msg_get(); |
| 990 | |
| 991 | devfs_msg->mdv_load = load; |
| 992 | devfs_msg_send(cmd, devfs_msg); |
| 993 | } |
| 994 | |
| 995 | /* |
| 996 | * sends a message with a name argument. |
| 997 | */ |
| 998 | void |
| 999 | devfs_msg_send_name(uint32_t cmd, char *name) |
| 1000 | { |
| 1001 | devfs_msg_t devfs_msg = devfs_msg_get(); |
| 1002 | |
| 1003 | devfs_msg->mdv_name = name; |
| 1004 | devfs_msg_send(cmd, devfs_msg); |
| 1005 | } |
| 1006 | |
| 1007 | /* |
| 1008 | * sends a message with a mount argument. |
| 1009 | */ |
| 1010 | void |
| 1011 | devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt) |
| 1012 | { |
| 1013 | devfs_msg_t devfs_msg = devfs_msg_get(); |
| 1014 | |
| 1015 | devfs_msg->mdv_mnt = mnt; |
| 1016 | devfs_msg_send(cmd, devfs_msg); |
| 1017 | } |
| 1018 | |
| 1019 | /* |
| 1020 | * sends a message with an ops argument. |
| 1021 | */ |
| 1022 | void |
| 1023 | devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor) |
| 1024 | { |
| 1025 | devfs_msg_t devfs_msg = devfs_msg_get(); |
| 1026 | |
| 1027 | devfs_msg->mdv_ops.ops = ops; |
| 1028 | devfs_msg->mdv_ops.minor = minor; |
| 1029 | devfs_msg_send(cmd, devfs_msg); |
| 1030 | } |
| 1031 | |
| 1032 | /* |
| 1033 | * sends a message with a clone handler argument. |
| 1034 | */ |
| 1035 | void |
| 1036 | devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler) |
| 1037 | { |
| 1038 | devfs_msg_t devfs_msg = devfs_msg_get(); |
| 1039 | |
| 1040 | devfs_msg->mdv_chandler.name = name; |
| 1041 | devfs_msg->mdv_chandler.nhandler = handler; |
| 1042 | devfs_msg_send(cmd, devfs_msg); |
| 1043 | } |
| 1044 | |
| 1045 | /* |
| 1046 | * sends a message with a device argument. |
| 1047 | */ |
| 1048 | void |
| 1049 | devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms) |
| 1050 | { |
| 1051 | devfs_msg_t devfs_msg = devfs_msg_get(); |
| 1052 | |
| 1053 | devfs_msg->mdv_dev.dev = dev; |
| 1054 | devfs_msg->mdv_dev.uid = uid; |
| 1055 | devfs_msg->mdv_dev.gid = gid; |
| 1056 | devfs_msg->mdv_dev.perms = perms; |
| 1057 | |
| 1058 | devfs_msg_send(cmd, devfs_msg); |
| 1059 | } |
| 1060 | |
| 1061 | /* |
| 1062 | * sends a message with a link argument. |
| 1063 | */ |
| 1064 | void |
| 1065 | devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp) |
| 1066 | { |
| 1067 | devfs_msg_t devfs_msg = devfs_msg_get(); |
| 1068 | |
| 1069 | devfs_msg->mdv_link.name = name; |
| 1070 | devfs_msg->mdv_link.target = target; |
| 1071 | devfs_msg->mdv_link.mp = mp; |
| 1072 | devfs_msg_send(cmd, devfs_msg); |
| 1073 | } |
| 1074 | |
| 1075 | /* |
| 1076 | * devfs_msg_core is the main devfs thread. It handles all incoming messages |
| 1077 | * and calls the relevant worker functions. By using messages it's assured |
| 1078 | * that events occur in the correct order. |
| 1079 | */ |
| 1080 | static void |
| 1081 | devfs_msg_core(void *arg) |
| 1082 | { |
| 1083 | devfs_msg_t msg; |
| 1084 | |
| 1085 | lwkt_initport_thread(&devfs_msg_port, curthread); |
| 1086 | |
| 1087 | lockmgr(&devfs_lock, LK_EXCLUSIVE); |
| 1088 | devfs_run = 1; |
| 1089 | wakeup(td_core); |
| 1090 | lockmgr(&devfs_lock, LK_RELEASE); |
| 1091 | |
| 1092 | get_mplock(); /* mpsafe yet? */ |
| 1093 | |
| 1094 | while (devfs_run) { |
| 1095 | msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0); |
| 1096 | devfs_debug(DEVFS_DEBUG_DEBUG, |
| 1097 | "devfs_msg_core, new msg: %x\n", |
| 1098 | (unsigned int)msg->hdr.u.ms_result); |
| 1099 | devfs_msg_exec(msg); |
| 1100 | lwkt_replymsg(&msg->hdr, 0); |
| 1101 | } |
| 1102 | |
| 1103 | rel_mplock(); |
| 1104 | wakeup(td_core); |
| 1105 | |
| 1106 | lwkt_exit(); |
| 1107 | } |
| 1108 | |
| 1109 | static void |
| 1110 | devfs_msg_exec(devfs_msg_t msg) |
| 1111 | { |
| 1112 | struct devfs_mnt_data *mnt; |
| 1113 | struct devfs_node *node; |
| 1114 | cdev_t dev; |
| 1115 | |
| 1116 | /* |
| 1117 | * Acquire the devfs lock to ensure safety of all called functions |
| 1118 | */ |
| 1119 | lockmgr(&devfs_lock, LK_EXCLUSIVE); |
| 1120 | |
| 1121 | switch (msg->hdr.u.ms_result) { |
| 1122 | case DEVFS_DEVICE_CREATE: |
| 1123 | dev = msg->mdv_dev.dev; |
| 1124 | devfs_create_dev_worker(dev, |
| 1125 | msg->mdv_dev.uid, |
| 1126 | msg->mdv_dev.gid, |
| 1127 | msg->mdv_dev.perms); |
| 1128 | break; |
| 1129 | case DEVFS_DEVICE_DESTROY: |
| 1130 | dev = msg->mdv_dev.dev; |
| 1131 | devfs_destroy_dev_worker(dev); |
| 1132 | break; |
| 1133 | case DEVFS_DESTROY_SUBNAMES: |
| 1134 | devfs_destroy_subnames_worker(msg->mdv_load); |
| 1135 | break; |
| 1136 | case DEVFS_DESTROY_DEV_BY_OPS: |
| 1137 | devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops, |
| 1138 | msg->mdv_ops.minor); |
| 1139 | break; |
| 1140 | case DEVFS_CREATE_ALL_DEV: |
| 1141 | node = (struct devfs_node *)msg->mdv_load; |
| 1142 | devfs_create_all_dev_worker(node); |
| 1143 | break; |
| 1144 | case DEVFS_MOUNT_ADD: |
| 1145 | mnt = msg->mdv_mnt; |
| 1146 | TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link); |
| 1147 | devfs_create_all_dev_worker(mnt->root_node); |
| 1148 | break; |
| 1149 | case DEVFS_MOUNT_DEL: |
| 1150 | mnt = msg->mdv_mnt; |
| 1151 | TAILQ_REMOVE(&devfs_mnt_list, mnt, link); |
| 1152 | devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback, |
| 1153 | NULL); |
| 1154 | if (mnt->leak_count) { |
| 1155 | devfs_debug(DEVFS_DEBUG_SHOW, |
| 1156 | "Leaked %ld devfs_node elements!\n", |
| 1157 | mnt->leak_count); |
| 1158 | } |
| 1159 | break; |
| 1160 | case DEVFS_CHANDLER_ADD: |
| 1161 | devfs_chandler_add_worker(msg->mdv_chandler.name, |
| 1162 | msg->mdv_chandler.nhandler); |
| 1163 | break; |
| 1164 | case DEVFS_CHANDLER_DEL: |
| 1165 | devfs_chandler_del_worker(msg->mdv_chandler.name); |
| 1166 | break; |
| 1167 | case DEVFS_FIND_DEVICE_BY_NAME: |
| 1168 | devfs_find_device_by_name_worker(msg); |
| 1169 | break; |
| 1170 | case DEVFS_FIND_DEVICE_BY_UDEV: |
| 1171 | devfs_find_device_by_udev_worker(msg); |
| 1172 | break; |
| 1173 | case DEVFS_MAKE_ALIAS: |
| 1174 | devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load); |
| 1175 | break; |
| 1176 | case DEVFS_DESTROY_ALIAS: |
| 1177 | devfs_destroy_alias_worker((struct devfs_alias *)msg->mdv_load); |
| 1178 | break; |
| 1179 | case DEVFS_APPLY_RULES: |
| 1180 | devfs_apply_reset_rules_caller(msg->mdv_name, 1); |
| 1181 | break; |
| 1182 | case DEVFS_RESET_RULES: |
| 1183 | devfs_apply_reset_rules_caller(msg->mdv_name, 0); |
| 1184 | break; |
| 1185 | case DEVFS_SCAN_CALLBACK: |
| 1186 | devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load, |
| 1187 | msg->mdv_load2); |
| 1188 | break; |
| 1189 | case DEVFS_CLR_SUBNAMES_FLAG: |
| 1190 | devfs_clr_subnames_flag_worker(msg->mdv_flags.name, |
| 1191 | msg->mdv_flags.flag); |
| 1192 | break; |
| 1193 | case DEVFS_DESTROY_SUBNAMES_WO_FLAG: |
| 1194 | devfs_destroy_subnames_without_flag_worker(msg->mdv_flags.name, |
| 1195 | msg->mdv_flags.flag); |
| 1196 | break; |
| 1197 | case DEVFS_INODE_TO_VNODE: |
| 1198 | msg->mdv_ino.vp = devfs_iterate_topology( |
| 1199 | DEVFS_MNTDATA(msg->mdv_ino.mp)->root_node, |
| 1200 | (devfs_iterate_callback_t *)devfs_inode_to_vnode_worker_callback, |
| 1201 | &msg->mdv_ino.ino); |
| 1202 | break; |
| 1203 | case DEVFS_TERMINATE_CORE: |
| 1204 | devfs_run = 0; |
| 1205 | break; |
| 1206 | case DEVFS_SYNC: |
| 1207 | break; |
| 1208 | default: |
| 1209 | devfs_debug(DEVFS_DEBUG_WARNING, |
| 1210 | "devfs_msg_core: unknown message " |
| 1211 | "received at core\n"); |
| 1212 | break; |
| 1213 | } |
| 1214 | lockmgr(&devfs_lock, LK_RELEASE); |
| 1215 | } |
| 1216 | |
| 1217 | /* |
| 1218 | * Worker function to insert a new dev into the dev list and initialize its |
| 1219 | * permissions. It also calls devfs_propagate_dev which in turn propagates |
| 1220 | * the change to all mount points. |
| 1221 | * |
| 1222 | * The passed dev is already referenced. This reference is eaten by this |
| 1223 | * function and represents the dev's linkage into devfs_dev_list. |
| 1224 | */ |
| 1225 | static int |
| 1226 | devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms) |
| 1227 | { |
| 1228 | KKASSERT(dev); |
| 1229 | |
| 1230 | dev->si_uid = uid; |
| 1231 | dev->si_gid = gid; |
| 1232 | dev->si_perms = perms; |
| 1233 | |
| 1234 | devfs_link_dev(dev); |
| 1235 | devfs_propagate_dev(dev, 1); |
| 1236 | |
| 1237 | udev_event_attach(dev, NULL, 0); |
| 1238 | |
| 1239 | return 0; |
| 1240 | } |
| 1241 | |
| 1242 | /* |
| 1243 | * Worker function to delete a dev from the dev list and free the cdev. |
| 1244 | * It also calls devfs_propagate_dev which in turn propagates the change |
| 1245 | * to all mount points. |
| 1246 | */ |
| 1247 | static int |
| 1248 | devfs_destroy_dev_worker(cdev_t dev) |
| 1249 | { |
| 1250 | int error; |
| 1251 | |
| 1252 | KKASSERT(dev); |
| 1253 | KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE); |
| 1254 | |
| 1255 | error = devfs_unlink_dev(dev); |
| 1256 | devfs_propagate_dev(dev, 0); |
| 1257 | |
| 1258 | udev_event_detach(dev, NULL, 0); |
| 1259 | |
| 1260 | if (error == 0) |
| 1261 | release_dev(dev); /* link ref */ |
| 1262 | release_dev(dev); |
| 1263 | release_dev(dev); |
| 1264 | |
| 1265 | return 0; |
| 1266 | } |
| 1267 | |
| 1268 | /* |
| 1269 | * Worker function to destroy all devices with a certain basename. |
| 1270 | * Calls devfs_destroy_dev_worker for the actual destruction. |
| 1271 | */ |
| 1272 | static int |
| 1273 | devfs_destroy_subnames_worker(char *name) |
| 1274 | { |
| 1275 | cdev_t dev, dev1; |
| 1276 | size_t len = strlen(name); |
| 1277 | |
| 1278 | TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { |
| 1279 | if ((!strncmp(dev->si_name, name, len)) && |
| 1280 | (dev->si_name[len] != '\0')) { |
| 1281 | devfs_destroy_dev_worker(dev); |
| 1282 | } |
| 1283 | } |
| 1284 | return 0; |
| 1285 | } |
| 1286 | |
| 1287 | static int |
| 1288 | devfs_clr_subnames_flag_worker(char *name, uint32_t flag) |
| 1289 | { |
| 1290 | cdev_t dev, dev1; |
| 1291 | size_t len = strlen(name); |
| 1292 | |
| 1293 | TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { |
| 1294 | if ((!strncmp(dev->si_name, name, len)) && |
| 1295 | (dev->si_name[len] != '\0')) { |
| 1296 | dev->si_flags &= ~flag; |
| 1297 | } |
| 1298 | } |
| 1299 | |
| 1300 | return 0; |
| 1301 | } |
| 1302 | |
| 1303 | static int |
| 1304 | devfs_destroy_subnames_without_flag_worker(char *name, uint32_t flag) |
| 1305 | { |
| 1306 | cdev_t dev, dev1; |
| 1307 | size_t len = strlen(name); |
| 1308 | |
| 1309 | TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { |
| 1310 | if ((!strncmp(dev->si_name, name, len)) && |
| 1311 | (dev->si_name[len] != '\0')) { |
| 1312 | if (!(dev->si_flags & flag)) { |
| 1313 | devfs_destroy_dev_worker(dev); |
| 1314 | } |
| 1315 | } |
| 1316 | } |
| 1317 | |
| 1318 | return 0; |
| 1319 | } |
| 1320 | |
| 1321 | /* |
| 1322 | * Worker function that creates all device nodes on top of a devfs |
| 1323 | * root node. |
| 1324 | */ |
| 1325 | static int |
| 1326 | devfs_create_all_dev_worker(struct devfs_node *root) |
| 1327 | { |
| 1328 | cdev_t dev; |
| 1329 | |
| 1330 | KKASSERT(root); |
| 1331 | |
| 1332 | TAILQ_FOREACH(dev, &devfs_dev_list, link) { |
| 1333 | devfs_create_device_node(root, dev, NULL, NULL); |
| 1334 | } |
| 1335 | |
| 1336 | return 0; |
| 1337 | } |
| 1338 | |
| 1339 | /* |
| 1340 | * Worker function that destroys all devices that match a specific |
| 1341 | * dev_ops and/or minor. If minor is less than 0, it is not matched |
| 1342 | * against. It also propagates all changes. |
| 1343 | */ |
| 1344 | static int |
| 1345 | devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor) |
| 1346 | { |
| 1347 | cdev_t dev, dev1; |
| 1348 | |
| 1349 | KKASSERT(ops); |
| 1350 | |
| 1351 | TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { |
| 1352 | if (dev->si_ops != ops) |
| 1353 | continue; |
| 1354 | if ((minor < 0) || (dev->si_uminor == minor)) { |
| 1355 | devfs_destroy_dev_worker(dev); |
| 1356 | } |
| 1357 | } |
| 1358 | |
| 1359 | return 0; |
| 1360 | } |
| 1361 | |
| 1362 | /* |
| 1363 | * Worker function that registers a new clone handler in devfs. |
| 1364 | */ |
| 1365 | static int |
| 1366 | devfs_chandler_add_worker(const char *name, d_clone_t *nhandler) |
| 1367 | { |
| 1368 | struct devfs_clone_handler *chandler = NULL; |
| 1369 | u_char len = strlen(name); |
| 1370 | |
| 1371 | if (len == 0) |
| 1372 | return 1; |
| 1373 | |
| 1374 | TAILQ_FOREACH(chandler, &devfs_chandler_list, link) { |
| 1375 | if (chandler->namlen != len) |
| 1376 | continue; |
| 1377 | |
| 1378 | if (!memcmp(chandler->name, name, len)) { |
| 1379 | /* Clonable basename already exists */ |
| 1380 | return 1; |
| 1381 | } |
| 1382 | } |
| 1383 | |
| 1384 | chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO); |
| 1385 | chandler->name = kstrdup(name, M_DEVFS); |
| 1386 | chandler->namlen = len; |
| 1387 | chandler->nhandler = nhandler; |
| 1388 | |
| 1389 | TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link); |
| 1390 | return 0; |
| 1391 | } |
| 1392 | |
| 1393 | /* |
| 1394 | * Worker function that removes a given clone handler from the |
| 1395 | * clone handler list. |
| 1396 | */ |
| 1397 | static int |
| 1398 | devfs_chandler_del_worker(const char *name) |
| 1399 | { |
| 1400 | struct devfs_clone_handler *chandler, *chandler2; |
| 1401 | u_char len = strlen(name); |
| 1402 | |
| 1403 | if (len == 0) |
| 1404 | return 1; |
| 1405 | |
| 1406 | TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) { |
| 1407 | if (chandler->namlen != len) |
| 1408 | continue; |
| 1409 | if (memcmp(chandler->name, name, len)) |
| 1410 | continue; |
| 1411 | |
| 1412 | TAILQ_REMOVE(&devfs_chandler_list, chandler, link); |
| 1413 | kfree(chandler->name, M_DEVFS); |
| 1414 | kfree(chandler, M_DEVFS); |
| 1415 | break; |
| 1416 | } |
| 1417 | |
| 1418 | return 0; |
| 1419 | } |
| 1420 | |
| 1421 | /* |
| 1422 | * Worker function that finds a given device name and changes |
| 1423 | * the message received accordingly so that when replied to, |
| 1424 | * the answer is returned to the caller. |
| 1425 | */ |
| 1426 | static int |
| 1427 | devfs_find_device_by_name_worker(devfs_msg_t devfs_msg) |
| 1428 | { |
| 1429 | struct devfs_alias *alias; |
| 1430 | cdev_t dev; |
| 1431 | cdev_t found = NULL; |
| 1432 | |
| 1433 | TAILQ_FOREACH(dev, &devfs_dev_list, link) { |
| 1434 | if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) { |
| 1435 | found = dev; |
| 1436 | break; |
| 1437 | } |
| 1438 | } |
| 1439 | if (found == NULL) { |
| 1440 | TAILQ_FOREACH(alias, &devfs_alias_list, link) { |
| 1441 | if (strcmp(devfs_msg->mdv_name, alias->name) == 0) { |
| 1442 | found = alias->dev_target; |
| 1443 | break; |
| 1444 | } |
| 1445 | } |
| 1446 | } |
| 1447 | devfs_msg->mdv_cdev = found; |
| 1448 | |
| 1449 | return 0; |
| 1450 | } |
| 1451 | |
| 1452 | /* |
| 1453 | * Worker function that finds a given device udev and changes |
| 1454 | * the message received accordingly so that when replied to, |
| 1455 | * the answer is returned to the caller. |
| 1456 | */ |
| 1457 | static int |
| 1458 | devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg) |
| 1459 | { |
| 1460 | cdev_t dev, dev1; |
| 1461 | cdev_t found = NULL; |
| 1462 | |
| 1463 | TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { |
| 1464 | if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) { |
| 1465 | found = dev; |
| 1466 | break; |
| 1467 | } |
| 1468 | } |
| 1469 | devfs_msg->mdv_cdev = found; |
| 1470 | |
| 1471 | return 0; |
| 1472 | } |
| 1473 | |
| 1474 | /* |
| 1475 | * Worker function that inserts a given alias into the |
| 1476 | * alias list, and propagates the alias to all mount |
| 1477 | * points. |
| 1478 | */ |
| 1479 | static int |
| 1480 | devfs_make_alias_worker(struct devfs_alias *alias) |
| 1481 | { |
| 1482 | struct devfs_alias *alias2; |
| 1483 | size_t len = strlen(alias->name); |
| 1484 | int found = 0; |
| 1485 | |
| 1486 | TAILQ_FOREACH(alias2, &devfs_alias_list, link) { |
| 1487 | if (len != alias2->namlen) |
| 1488 | continue; |
| 1489 | |
| 1490 | if (!memcmp(alias->name, alias2->name, len)) { |
| 1491 | found = 1; |
| 1492 | break; |
| 1493 | } |
| 1494 | } |
| 1495 | |
| 1496 | if (!found) { |
| 1497 | /* |
| 1498 | * The alias doesn't exist yet, so we add it to the alias list |
| 1499 | */ |
| 1500 | TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link); |
| 1501 | devfs_alias_propagate(alias, 0); |
| 1502 | udev_event_attach(alias->dev_target, alias->name, 1); |
| 1503 | } else { |
| 1504 | devfs_debug(DEVFS_DEBUG_WARNING, |
| 1505 | "Warning: duplicate devfs_make_alias for %s\n", |
| 1506 | alias->name); |
| 1507 | kfree(alias->name, M_DEVFS); |
| 1508 | kfree(alias, M_DEVFS); |
| 1509 | } |
| 1510 | |
| 1511 | return 0; |
| 1512 | } |
| 1513 | |
| 1514 | /* |
| 1515 | * Worker function that delete a given alias from the |
| 1516 | * alias list, and propagates the removal to all mount |
| 1517 | * points. |
| 1518 | */ |
| 1519 | static int |
| 1520 | devfs_destroy_alias_worker(struct devfs_alias *alias) |
| 1521 | { |
| 1522 | struct devfs_alias *alias2; |
| 1523 | int found = 0; |
| 1524 | |
| 1525 | TAILQ_FOREACH(alias2, &devfs_alias_list, link) { |
| 1526 | if (alias->dev_target != alias2->dev_target) |
| 1527 | continue; |
| 1528 | |
| 1529 | if (devfs_WildCmp(alias->name, alias2->name) == 0) { |
| 1530 | found = 1; |
| 1531 | break; |
| 1532 | } |
| 1533 | } |
| 1534 | |
| 1535 | if (!found) { |
| 1536 | devfs_debug(DEVFS_DEBUG_WARNING, |
| 1537 | "Warning: devfs_destroy_alias for inexistant alias: %s\n", |
| 1538 | alias->name); |
| 1539 | kfree(alias->name, M_DEVFS); |
| 1540 | kfree(alias, M_DEVFS); |
| 1541 | } else { |
| 1542 | /* |
| 1543 | * The alias exists, so we delete it from the alias list |
| 1544 | */ |
| 1545 | TAILQ_REMOVE(&devfs_alias_list, alias2, link); |
| 1546 | devfs_alias_propagate(alias2, 1); |
| 1547 | udev_event_detach(alias2->dev_target, alias2->name, 1); |
| 1548 | kfree(alias->name, M_DEVFS); |
| 1549 | kfree(alias, M_DEVFS); |
| 1550 | kfree(alias2->name, M_DEVFS); |
| 1551 | kfree(alias2, M_DEVFS); |
| 1552 | } |
| 1553 | |
| 1554 | return 0; |
| 1555 | } |
| 1556 | |
| 1557 | /* |
| 1558 | * Function that removes and frees all aliases. |
| 1559 | */ |
| 1560 | static int |
| 1561 | devfs_alias_reap(void) |
| 1562 | { |
| 1563 | struct devfs_alias *alias, *alias2; |
| 1564 | |
| 1565 | TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) { |
| 1566 | TAILQ_REMOVE(&devfs_alias_list, alias, link); |
| 1567 | kfree(alias->name, M_DEVFS); |
| 1568 | kfree(alias, M_DEVFS); |
| 1569 | } |
| 1570 | return 0; |
| 1571 | } |
| 1572 | |
| 1573 | /* |
| 1574 | * Function that removes an alias matching a specific cdev and frees |
| 1575 | * it accordingly. |
| 1576 | */ |
| 1577 | static int |
| 1578 | devfs_alias_remove(cdev_t dev) |
| 1579 | { |
| 1580 | struct devfs_alias *alias, *alias2; |
| 1581 | |
| 1582 | TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) { |
| 1583 | if (alias->dev_target == dev) { |
| 1584 | TAILQ_REMOVE(&devfs_alias_list, alias, link); |
| 1585 | udev_event_detach(alias->dev_target, alias->name, 1); |
| 1586 | kfree(alias->name, M_DEVFS); |
| 1587 | kfree(alias, M_DEVFS); |
| 1588 | } |
| 1589 | } |
| 1590 | return 0; |
| 1591 | } |
| 1592 | |
| 1593 | /* |
| 1594 | * This function propagates an alias addition or removal to |
| 1595 | * all mount points. |
| 1596 | */ |
| 1597 | static int |
| 1598 | devfs_alias_propagate(struct devfs_alias *alias, int remove) |
| 1599 | { |
| 1600 | struct devfs_mnt_data *mnt; |
| 1601 | |
| 1602 | TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { |
| 1603 | if (remove) { |
| 1604 | devfs_destroy_node(mnt->root_node, alias->name); |
| 1605 | } else { |
| 1606 | devfs_alias_apply(mnt->root_node, alias); |
| 1607 | } |
| 1608 | } |
| 1609 | return 0; |
| 1610 | } |
| 1611 | |
| 1612 | /* |
| 1613 | * This function is a recursive function iterating through |
| 1614 | * all device nodes in the topology and, if applicable, |
| 1615 | * creating the relevant alias for a device node. |
| 1616 | */ |
| 1617 | static int |
| 1618 | devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias) |
| 1619 | { |
| 1620 | struct devfs_node *node1, *node2; |
| 1621 | |
| 1622 | KKASSERT(alias != NULL); |
| 1623 | |
| 1624 | if ((node->node_type == Proot) || (node->node_type == Pdir)) { |
| 1625 | if (node->nchildren > 2) { |
| 1626 | TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) { |
| 1627 | devfs_alias_apply(node1, alias); |
| 1628 | } |
| 1629 | } |
| 1630 | } else { |
| 1631 | if (node->d_dev == alias->dev_target) |
| 1632 | devfs_alias_create(alias->name, node, 0); |
| 1633 | } |
| 1634 | return 0; |
| 1635 | } |
| 1636 | |
| 1637 | /* |
| 1638 | * This function checks if any alias possibly is applicable |
| 1639 | * to the given node. If so, the alias is created. |
| 1640 | */ |
| 1641 | static int |
| 1642 | devfs_alias_check_create(struct devfs_node *node) |
| 1643 | { |
| 1644 | struct devfs_alias *alias; |
| 1645 | |
| 1646 | TAILQ_FOREACH(alias, &devfs_alias_list, link) { |
| 1647 | if (node->d_dev == alias->dev_target) |
| 1648 | devfs_alias_create(alias->name, node, 0); |
| 1649 | } |
| 1650 | return 0; |
| 1651 | } |
| 1652 | |
| 1653 | /* |
| 1654 | * This function creates an alias with a given name |
| 1655 | * linking to a given devfs node. It also increments |
| 1656 | * the link count on the target node. |
| 1657 | */ |
| 1658 | int |
| 1659 | devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based) |
| 1660 | { |
| 1661 | struct mount *mp = target->mp; |
| 1662 | struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node; |
| 1663 | struct devfs_node *linknode; |
| 1664 | char *create_path = NULL; |
| 1665 | char *name; |
| 1666 | char *name_buf; |
| 1667 | int result = 0; |
| 1668 | |
| 1669 | KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE); |
| 1670 | |
| 1671 | name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); |
| 1672 | devfs_resolve_name_path(name_orig, name_buf, &create_path, &name); |
| 1673 | |
| 1674 | if (create_path) |
| 1675 | parent = devfs_resolve_or_create_path(parent, create_path, 1); |
| 1676 | |
| 1677 | |
| 1678 | if (devfs_find_device_node_by_name(parent, name)) { |
| 1679 | devfs_debug(DEVFS_DEBUG_WARNING, |
| 1680 | "Node already exists: %s " |
| 1681 | "(devfs_make_alias_worker)!\n", |
| 1682 | name); |
| 1683 | result = 1; |
| 1684 | goto done; |
| 1685 | } |
| 1686 | |
| 1687 | linknode = devfs_allocp(Plink, name, parent, mp, NULL); |
| 1688 | if (linknode == NULL) { |
| 1689 | result = 1; |
| 1690 | goto done; |
| 1691 | } |
| 1692 | |
| 1693 | linknode->link_target = target; |
| 1694 | target->nlinks++; |
| 1695 | |
| 1696 | if (rule_based) |
| 1697 | linknode->flags |= DEVFS_RULE_CREATED; |
| 1698 | |
| 1699 | done: |
| 1700 | kfree(name_buf, M_TEMP); |
| 1701 | return (result); |
| 1702 | } |
| 1703 | |
| 1704 | /* |
| 1705 | * This function is called by the core and handles mount point |
| 1706 | * strings. It either calls the relevant worker (devfs_apply_ |
| 1707 | * reset_rules_worker) on all mountpoints or only a specific |
| 1708 | * one. |
| 1709 | */ |
| 1710 | static int |
| 1711 | devfs_apply_reset_rules_caller(char *mountto, int apply) |
| 1712 | { |
| 1713 | struct devfs_mnt_data *mnt; |
| 1714 | |
| 1715 | if (mountto[0] == '*') { |
| 1716 | TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { |
| 1717 | devfs_iterate_topology(mnt->root_node, |
| 1718 | (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node), |
| 1719 | NULL); |
| 1720 | } |
| 1721 | } else { |
| 1722 | TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { |
| 1723 | if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) { |
| 1724 | devfs_iterate_topology(mnt->root_node, |
| 1725 | (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node), |
| 1726 | NULL); |
| 1727 | break; |
| 1728 | } |
| 1729 | } |
| 1730 | } |
| 1731 | |
| 1732 | kfree(mountto, M_DEVFS); |
| 1733 | return 0; |
| 1734 | } |
| 1735 | |
| 1736 | /* |
| 1737 | * This function calls a given callback function for |
| 1738 | * every dev node in the devfs dev list. |
| 1739 | */ |
| 1740 | static int |
| 1741 | devfs_scan_callback_worker(devfs_scan_t *callback, void *arg) |
| 1742 | { |
| 1743 | cdev_t dev, dev1; |
| 1744 | |
| 1745 | TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { |
| 1746 | callback(dev, arg); |
| 1747 | } |
| 1748 | |
| 1749 | return 0; |
| 1750 | } |
| 1751 | |
| 1752 | /* |
| 1753 | * This function tries to resolve a given directory, or if not |
| 1754 | * found and creation requested, creates the given directory. |
| 1755 | */ |
| 1756 | static struct devfs_node * |
| 1757 | devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name, |
| 1758 | size_t name_len, int create) |
| 1759 | { |
| 1760 | struct devfs_node *node, *found = NULL; |
| 1761 | |
| 1762 | TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) { |
| 1763 | if (name_len != node->d_dir.d_namlen) |
| 1764 | continue; |
| 1765 | |
| 1766 | if (!memcmp(dir_name, node->d_dir.d_name, name_len)) { |
| 1767 | found = node; |
| 1768 | break; |
| 1769 | } |
| 1770 | } |
| 1771 | |
| 1772 | if ((found == NULL) && (create)) { |
| 1773 | found = devfs_allocp(Pdir, dir_name, parent, parent->mp, NULL); |
| 1774 | } |
| 1775 | |
| 1776 | return found; |
| 1777 | } |
| 1778 | |
| 1779 | /* |
| 1780 | * This function tries to resolve a complete path. If creation is requested, |
| 1781 | * if a given part of the path cannot be resolved (because it doesn't exist), |
| 1782 | * it is created. |
| 1783 | */ |
| 1784 | struct devfs_node * |
| 1785 | devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create) |
| 1786 | { |
| 1787 | struct devfs_node *node = parent; |
| 1788 | char *buf; |
| 1789 | size_t idx = 0; |
| 1790 | |
| 1791 | if (path == NULL) |
| 1792 | return parent; |
| 1793 | |
| 1794 | buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); |
| 1795 | |
| 1796 | while (*path && idx < PATH_MAX - 1) { |
| 1797 | if (*path != '/') { |
| 1798 | buf[idx++] = *path; |
| 1799 | } else { |
| 1800 | buf[idx] = '\0'; |
| 1801 | node = devfs_resolve_or_create_dir(node, buf, idx, create); |
| 1802 | if (node == NULL) { |
| 1803 | kfree(buf, M_TEMP); |
| 1804 | return NULL; |
| 1805 | } |
| 1806 | idx = 0; |
| 1807 | } |
| 1808 | ++path; |
| 1809 | } |
| 1810 | buf[idx] = '\0'; |
| 1811 | node = devfs_resolve_or_create_dir(node, buf, idx, create); |
| 1812 | kfree (buf, M_TEMP); |
| 1813 | return (node); |
| 1814 | } |
| 1815 | |
| 1816 | /* |
| 1817 | * Takes a full path and strips it into a directory path and a name. |
| 1818 | * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It |
| 1819 | * requires a working buffer with enough size to keep the whole |
| 1820 | * fullpath. |
| 1821 | */ |
| 1822 | int |
| 1823 | devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep) |
| 1824 | { |
| 1825 | char *name = NULL; |
| 1826 | char *path = NULL; |
| 1827 | size_t len = strlen(fullpath) + 1; |
| 1828 | int i; |
| 1829 | |
| 1830 | KKASSERT((fullpath != NULL) && (buf != NULL)); |
| 1831 | KKASSERT((pathp != NULL) && (namep != NULL)); |
| 1832 | |
| 1833 | memcpy(buf, fullpath, len); |
| 1834 | |
| 1835 | for (i = len-1; i>= 0; i--) { |
| 1836 | if (buf[i] == '/') { |
| 1837 | buf[i] = '\0'; |
| 1838 | name = &(buf[i+1]); |
| 1839 | path = buf; |
| 1840 | break; |
| 1841 | } |
| 1842 | } |
| 1843 | |
| 1844 | *pathp = path; |
| 1845 | |
| 1846 | if (name) { |
| 1847 | *namep = name; |
| 1848 | } else { |
| 1849 | *namep = buf; |
| 1850 | } |
| 1851 | |
| 1852 | return 0; |
| 1853 | } |
| 1854 | |
| 1855 | /* |
| 1856 | * This function creates a new devfs node for a given device. It can |
| 1857 | * handle a complete path as device name, and accordingly creates |
| 1858 | * the path and the final device node. |
| 1859 | * |
| 1860 | * The reference count on the passed dev remains unchanged. |
| 1861 | */ |
| 1862 | struct devfs_node * |
| 1863 | devfs_create_device_node(struct devfs_node *root, cdev_t dev, |
| 1864 | char *dev_name, char *path_fmt, ...) |
| 1865 | { |
| 1866 | struct devfs_node *parent, *node = NULL; |
| 1867 | char *path = NULL; |
| 1868 | char *name; |
| 1869 | char *name_buf; |
| 1870 | __va_list ap; |
| 1871 | int i, found; |
| 1872 | char *create_path = NULL; |
| 1873 | char *names = "pqrsPQRS"; |
| 1874 | |
| 1875 | name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); |
| 1876 | |
| 1877 | if (path_fmt != NULL) { |
| 1878 | __va_start(ap, path_fmt); |
| 1879 | kvasnrprintf(&path, PATH_MAX, 10, path_fmt, ap); |
| 1880 | __va_end(ap); |
| 1881 | } |
| 1882 | |
| 1883 | parent = devfs_resolve_or_create_path(root, path, 1); |
| 1884 | KKASSERT(parent); |
| 1885 | |
| 1886 | devfs_resolve_name_path( |
| 1887 | ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name), |
| 1888 | name_buf, &create_path, &name); |
| 1889 | |
| 1890 | if (create_path) |
| 1891 | parent = devfs_resolve_or_create_path(parent, create_path, 1); |
| 1892 | |
| 1893 | |
| 1894 | if (devfs_find_device_node_by_name(parent, name)) { |
| 1895 | devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: " |
| 1896 | "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name); |
| 1897 | goto out; |
| 1898 | } |
| 1899 | |
| 1900 | node = devfs_allocp(Pdev, name, parent, parent->mp, dev); |
| 1901 | nanotime(&parent->mtime); |
| 1902 | |
| 1903 | /* |
| 1904 | * Ugly unix98 pty magic, to hide pty master (ptm) devices and their |
| 1905 | * directory |
| 1906 | */ |
| 1907 | if ((dev) && (strlen(dev->si_name) >= 4) && |
| 1908 | (!memcmp(dev->si_name, "ptm/", 4))) { |
| 1909 | node->parent->flags |= DEVFS_HIDDEN; |
| 1910 | node->flags |= DEVFS_HIDDEN; |
| 1911 | } |
| 1912 | |
| 1913 | /* |
| 1914 | * Ugly pty magic, to tag pty devices as such and hide them if needed. |
| 1915 | */ |
| 1916 | if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3))) |
| 1917 | node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE); |
| 1918 | |
| 1919 | if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) { |
| 1920 | found = 0; |
| 1921 | for (i = 0; i < strlen(names); i++) { |
| 1922 | if (name[3] == names[i]) { |
| 1923 | found = 1; |
| 1924 | break; |
| 1925 | } |
| 1926 | } |
| 1927 | if (found) |
| 1928 | node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE); |
| 1929 | } |
| 1930 | |
| 1931 | out: |
| 1932 | kfree(name_buf, M_TEMP); |
| 1933 | kvasfree(&path); |
| 1934 | return node; |
| 1935 | } |
| 1936 | |
| 1937 | /* |
| 1938 | * This function finds a given device node in the topology with a given |
| 1939 | * cdev. |
| 1940 | */ |
| 1941 | void * |
| 1942 | devfs_find_device_node_callback(struct devfs_node *node, cdev_t target) |
| 1943 | { |
| 1944 | if ((node->node_type == Pdev) && (node->d_dev == target)) { |
| 1945 | return node; |
| 1946 | } |
| 1947 | |
| 1948 | return NULL; |
| 1949 | } |
| 1950 | |
| 1951 | /* |
| 1952 | * This function finds a device node in the given parent directory by its |
| 1953 | * name and returns it. |
| 1954 | */ |
| 1955 | struct devfs_node * |
| 1956 | devfs_find_device_node_by_name(struct devfs_node *parent, char *target) |
| 1957 | { |
| 1958 | struct devfs_node *node, *found = NULL; |
| 1959 | size_t len = strlen(target); |
| 1960 | |
| 1961 | TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) { |
| 1962 | if (len != node->d_dir.d_namlen) |
| 1963 | continue; |
| 1964 | |
| 1965 | if (!memcmp(node->d_dir.d_name, target, len)) { |
| 1966 | found = node; |
| 1967 | break; |
| 1968 | } |
| 1969 | } |
| 1970 | |
| 1971 | return found; |
| 1972 | } |
| 1973 | |
| 1974 | static void * |
| 1975 | devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop) |
| 1976 | { |
| 1977 | struct vnode *vp = NULL; |
| 1978 | ino_t target = *inop; |
| 1979 | |
| 1980 | if (node->d_dir.d_ino == target) { |
| 1981 | if (node->v_node) { |
| 1982 | vp = node->v_node; |
| 1983 | vget(vp, LK_EXCLUSIVE | LK_RETRY); |
| 1984 | vn_unlock(vp); |
| 1985 | } else { |
| 1986 | devfs_allocv(&vp, node); |
| 1987 | vn_unlock(vp); |
| 1988 | } |
| 1989 | } |
| 1990 | |
| 1991 | return vp; |
| 1992 | } |
| 1993 | |
| 1994 | /* |
| 1995 | * This function takes a cdev and removes its devfs node in the |
| 1996 | * given topology. The cdev remains intact. |
| 1997 | */ |
| 1998 | int |
| 1999 | devfs_destroy_device_node(struct devfs_node *root, cdev_t target) |
| 2000 | { |
| 2001 | KKASSERT(target != NULL); |
| 2002 | return devfs_destroy_node(root, target->si_name); |
| 2003 | } |
| 2004 | |
| 2005 | /* |
| 2006 | * This function takes a path to a devfs node, resolves it and |
| 2007 | * removes the devfs node from the given topology. |
| 2008 | */ |
| 2009 | int |
| 2010 | devfs_destroy_node(struct devfs_node *root, char *target) |
| 2011 | { |
| 2012 | struct devfs_node *node, *parent; |
| 2013 | char *name; |
| 2014 | char *name_buf; |
| 2015 | char *create_path = NULL; |
| 2016 | |
| 2017 | KKASSERT(target); |
| 2018 | |
| 2019 | name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); |
| 2020 | ksnprintf(name_buf, PATH_MAX, "%s", target); |
| 2021 | |
| 2022 | devfs_resolve_name_path(target, name_buf, &create_path, &name); |
| 2023 | |
| 2024 | if (create_path) |
| 2025 | parent = devfs_resolve_or_create_path(root, create_path, 0); |
| 2026 | else |
| 2027 | parent = root; |
| 2028 | |
| 2029 | if (parent == NULL) { |
| 2030 | kfree(name_buf, M_TEMP); |
| 2031 | return 1; |
| 2032 | } |
| 2033 | |
| 2034 | node = devfs_find_device_node_by_name(parent, name); |
| 2035 | |
| 2036 | if (node) { |
| 2037 | nanotime(&node->parent->mtime); |
| 2038 | devfs_gc(node); |
| 2039 | } |
| 2040 | |
| 2041 | kfree(name_buf, M_TEMP); |
| 2042 | |
| 2043 | return 0; |
| 2044 | } |
| 2045 | |
| 2046 | /* |
| 2047 | * Just set perms and ownership for given node. |
| 2048 | */ |
| 2049 | int |
| 2050 | devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid, |
| 2051 | u_short mode, u_long flags) |
| 2052 | { |
| 2053 | node->mode = mode; |
| 2054 | node->uid = uid; |
| 2055 | node->gid = gid; |
| 2056 | |
| 2057 | return 0; |
| 2058 | } |
| 2059 | |
| 2060 | /* |
| 2061 | * Propagates a device attach/detach to all mount |
| 2062 | * points. Also takes care of automatic alias removal |
| 2063 | * for a deleted cdev. |
| 2064 | */ |
| 2065 | static int |
| 2066 | devfs_propagate_dev(cdev_t dev, int attach) |
| 2067 | { |
| 2068 | struct devfs_mnt_data *mnt; |
| 2069 | |
| 2070 | TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { |
| 2071 | if (attach) { |
| 2072 | /* Device is being attached */ |
| 2073 | devfs_create_device_node(mnt->root_node, dev, |
| 2074 | NULL, NULL ); |
| 2075 | } else { |
| 2076 | /* Device is being detached */ |
| 2077 | devfs_alias_remove(dev); |
| 2078 | devfs_destroy_device_node(mnt->root_node, dev); |
| 2079 | } |
| 2080 | } |
| 2081 | return 0; |
| 2082 | } |
| 2083 | |
| 2084 | /* |
| 2085 | * devfs_clone either returns a basename from a complete name by |
| 2086 | * returning the length of the name without trailing digits, or, |
| 2087 | * if clone != 0, calls the device's clone handler to get a new |
| 2088 | * device, which in turn is returned in devp. |
| 2089 | */ |
| 2090 | cdev_t |
| 2091 | devfs_clone(cdev_t dev, const char *name, size_t len, int mode, |
| 2092 | struct ucred *cred) |
| 2093 | { |
| 2094 | int error; |
| 2095 | struct devfs_clone_handler *chandler; |
| 2096 | struct dev_clone_args ap; |
| 2097 | |
| 2098 | TAILQ_FOREACH(chandler, &devfs_chandler_list, link) { |
| 2099 | if (chandler->namlen != len) |
| 2100 | continue; |
| 2101 | if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) { |
| 2102 | lockmgr(&devfs_lock, LK_RELEASE); |
| 2103 | devfs_config(); |
| 2104 | lockmgr(&devfs_lock, LK_EXCLUSIVE); |
| 2105 | |
| 2106 | ap.a_head.a_dev = dev; |
| 2107 | ap.a_dev = NULL; |
| 2108 | ap.a_name = name; |
| 2109 | ap.a_namelen = len; |
| 2110 | ap.a_mode = mode; |
| 2111 | ap.a_cred = cred; |
| 2112 | error = (chandler->nhandler)(&ap); |
| 2113 | if (error) |
| 2114 | continue; |
| 2115 | |
| 2116 | return ap.a_dev; |
| 2117 | } |
| 2118 | } |
| 2119 | |
| 2120 | return NULL; |
| 2121 | } |
| 2122 | |
| 2123 | |
| 2124 | /* |
| 2125 | * Registers a new orphan in the orphan list. |
| 2126 | */ |
| 2127 | void |
| 2128 | devfs_tracer_add_orphan(struct devfs_node *node) |
| 2129 | { |
| 2130 | struct devfs_orphan *orphan; |
| 2131 | |
| 2132 | KKASSERT(node); |
| 2133 | orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK); |
| 2134 | orphan->node = node; |
| 2135 | |
| 2136 | KKASSERT((node->flags & DEVFS_ORPHANED) == 0); |
| 2137 | node->flags |= DEVFS_ORPHANED; |
| 2138 | TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link); |
| 2139 | } |
| 2140 | |
| 2141 | /* |
| 2142 | * Removes an orphan from the orphan list. |
| 2143 | */ |
| 2144 | void |
| 2145 | devfs_tracer_del_orphan(struct devfs_node *node) |
| 2146 | { |
| 2147 | struct devfs_orphan *orphan; |
| 2148 | |
| 2149 | KKASSERT(node); |
| 2150 | |
| 2151 | TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) { |
| 2152 | if (orphan->node == node) { |
| 2153 | node->flags &= ~DEVFS_ORPHANED; |
| 2154 | TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link); |
| 2155 | kfree(orphan, M_DEVFS); |
| 2156 | break; |
| 2157 | } |
| 2158 | } |
| 2159 | } |
| 2160 | |
| 2161 | /* |
| 2162 | * Counts the orphans in the orphan list, and if cleanup |
| 2163 | * is specified, also frees the orphan and removes it from |
| 2164 | * the list. |
| 2165 | */ |
| 2166 | size_t |
| 2167 | devfs_tracer_orphan_count(struct mount *mp, int cleanup) |
| 2168 | { |
| 2169 | struct devfs_orphan *orphan, *orphan2; |
| 2170 | size_t count = 0; |
| 2171 | |
| 2172 | TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) { |
| 2173 | count++; |
| 2174 | /* |
| 2175 | * If we are instructed to clean up, we do so. |
| 2176 | */ |
| 2177 | if (cleanup) { |
| 2178 | TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link); |
| 2179 | orphan->node->flags &= ~DEVFS_ORPHANED; |
| 2180 | devfs_freep(orphan->node); |
| 2181 | kfree(orphan, M_DEVFS); |
| 2182 | } |
| 2183 | } |
| 2184 | |
| 2185 | return count; |
| 2186 | } |
| 2187 | |
| 2188 | /* |
| 2189 | * Fetch an ino_t from the global d_ino by increasing it |
| 2190 | * while spinlocked. |
| 2191 | */ |
| 2192 | static ino_t |
| 2193 | devfs_fetch_ino(void) |
| 2194 | { |
| 2195 | ino_t ret; |
| 2196 | |
| 2197 | spin_lock(&ino_lock); |
| 2198 | ret = d_ino++; |
| 2199 | spin_unlock(&ino_lock); |
| 2200 | |
| 2201 | return ret; |
| 2202 | } |
| 2203 | |
| 2204 | /* |
| 2205 | * Allocates a new cdev and initializes it's most basic |
| 2206 | * fields. |
| 2207 | */ |
| 2208 | cdev_t |
| 2209 | devfs_new_cdev(struct dev_ops *ops, int minor, struct dev_ops *bops) |
| 2210 | { |
| 2211 | cdev_t dev = sysref_alloc(&cdev_sysref_class); |
| 2212 | |
| 2213 | sysref_activate(&dev->si_sysref); |
| 2214 | reference_dev(dev); |
| 2215 | bzero(dev, offsetof(struct cdev, si_sysref)); |
| 2216 | |
| 2217 | dev->si_uid = 0; |
| 2218 | dev->si_gid = 0; |
| 2219 | dev->si_perms = 0; |
| 2220 | dev->si_drv1 = NULL; |
| 2221 | dev->si_drv2 = NULL; |
| 2222 | dev->si_lastread = 0; /* time_second */ |
| 2223 | dev->si_lastwrite = 0; /* time_second */ |
| 2224 | |
| 2225 | dev->si_dict = NULL; |
| 2226 | dev->si_ops = ops; |
| 2227 | dev->si_flags = 0; |
| 2228 | dev->si_umajor = 0; |
| 2229 | dev->si_uminor = minor; |
| 2230 | dev->si_bops = bops; |
| 2231 | /* If there is a backing device, we reference its ops */ |
| 2232 | dev->si_inode = makeudev( |
| 2233 | devfs_reference_ops((bops)?(bops):(ops)), |
| 2234 | minor ); |
| 2235 | |
| 2236 | return dev; |
| 2237 | } |
| 2238 | |
| 2239 | static void |
| 2240 | devfs_cdev_terminate(cdev_t dev) |
| 2241 | { |
| 2242 | int locked = 0; |
| 2243 | |
| 2244 | /* Check if it is locked already. if not, we acquire the devfs lock */ |
| 2245 | if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) { |
| 2246 | lockmgr(&devfs_lock, LK_EXCLUSIVE); |
| 2247 | locked = 1; |
| 2248 | } |
| 2249 | |
| 2250 | /* Propagate destruction, just in case */ |
| 2251 | devfs_propagate_dev(dev, 0); |
| 2252 | |
| 2253 | /* If we acquired the lock, we also get rid of it */ |
| 2254 | if (locked) |
| 2255 | lockmgr(&devfs_lock, LK_RELEASE); |
| 2256 | |
| 2257 | /* If there is a backing device, we release the backing device's ops */ |
| 2258 | devfs_release_ops((dev->si_bops)?(dev->si_bops):(dev->si_ops)); |
| 2259 | |
| 2260 | /* Finally destroy the device */ |
| 2261 | sysref_put(&dev->si_sysref); |
| 2262 | } |
| 2263 | |
| 2264 | /* |
| 2265 | * Dummies for now (individual locks for MPSAFE) |
| 2266 | */ |
| 2267 | static void |
| 2268 | devfs_cdev_lock(cdev_t dev) |
| 2269 | { |
| 2270 | } |
| 2271 | |
| 2272 | static void |
| 2273 | devfs_cdev_unlock(cdev_t dev) |
| 2274 | { |
| 2275 | } |
| 2276 | |
| 2277 | static int |
| 2278 | devfs_detached_filter_eof(struct knote *kn, long hint) |
| 2279 | { |
| 2280 | kn->kn_flags |= EV_EOF; |
| 2281 | return (1); |
| 2282 | } |
| 2283 | |
| 2284 | static void |
| 2285 | devfs_detached_filter_detach(struct knote *kn) |
| 2286 | { |
| 2287 | cdev_t dev = (cdev_t)kn->kn_hook; |
| 2288 | |
| 2289 | knote_remove(&dev->si_kqinfo.ki_note, kn); |
| 2290 | } |
| 2291 | |
| 2292 | static struct filterops devfs_detached_filterops = |
| 2293 | { FILTEROP_ISFD, NULL, |
| 2294 | devfs_detached_filter_detach, |
| 2295 | devfs_detached_filter_eof }; |
| 2296 | |
| 2297 | /* |
| 2298 | * Delegates knote filter handling responsibility to devfs |
| 2299 | * |
| 2300 | * Any device that implements kqfilter event handling and could be detached |
| 2301 | * or shut down out from under the kevent subsystem must allow devfs to |
| 2302 | * assume responsibility for any knotes it may hold. |
| 2303 | */ |
| 2304 | void |
| 2305 | devfs_assume_knotes(cdev_t dev, struct kqinfo *kqi) |
| 2306 | { |
| 2307 | /* |
| 2308 | * Let kern/kern_event.c do the heavy lifting. |
| 2309 | */ |
| 2310 | knote_assume_knotes(kqi, &dev->si_kqinfo, |
| 2311 | &devfs_detached_filterops, (void *)dev); |
| 2312 | |
| 2313 | /* |
| 2314 | * These should probably be activated individually, but doing so |
| 2315 | * would require refactoring kq's public in-kernel interface. |
| 2316 | */ |
| 2317 | KNOTE(&dev->si_kqinfo.ki_note, 0); |
| 2318 | } |
| 2319 | |
| 2320 | /* |
| 2321 | * Links a given cdev into the dev list. |
| 2322 | */ |
| 2323 | int |
| 2324 | devfs_link_dev(cdev_t dev) |
| 2325 | { |
| 2326 | KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0); |
| 2327 | dev->si_flags |= SI_DEVFS_LINKED; |
| 2328 | TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link); |
| 2329 | |
| 2330 | return 0; |
| 2331 | } |
| 2332 | |
| 2333 | /* |
| 2334 | * Removes a given cdev from the dev list. The caller is responsible for |
| 2335 | * releasing the reference on the device associated with the linkage. |
| 2336 | * |
| 2337 | * Returns EALREADY if the dev has already been unlinked. |
| 2338 | */ |
| 2339 | static int |
| 2340 | devfs_unlink_dev(cdev_t dev) |
| 2341 | { |
| 2342 | if ((dev->si_flags & SI_DEVFS_LINKED)) { |
| 2343 | TAILQ_REMOVE(&devfs_dev_list, dev, link); |
| 2344 | dev->si_flags &= ~SI_DEVFS_LINKED; |
| 2345 | return (0); |
| 2346 | } |
| 2347 | return (EALREADY); |
| 2348 | } |
| 2349 | |
| 2350 | int |
| 2351 | devfs_node_is_accessible(struct devfs_node *node) |
| 2352 | { |
| 2353 | if ((node) && (!(node->flags & DEVFS_HIDDEN))) |
| 2354 | return 1; |
| 2355 | else |
| 2356 | return 0; |
| 2357 | } |
| 2358 | |
| 2359 | int |
| 2360 | devfs_reference_ops(struct dev_ops *ops) |
| 2361 | { |
| 2362 | int unit; |
| 2363 | struct devfs_dev_ops *found = NULL; |
| 2364 | struct devfs_dev_ops *devops; |
| 2365 | |
| 2366 | TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) { |
| 2367 | if (devops->ops == ops) { |
| 2368 | found = devops; |
| 2369 | break; |
| 2370 | } |
| 2371 | } |
| 2372 | |
| 2373 | if (!found) { |
| 2374 | found = kmalloc(sizeof(struct devfs_dev_ops), M_DEVFS, M_WAITOK); |
| 2375 | found->ops = ops; |
| 2376 | found->ref_count = 0; |
| 2377 | TAILQ_INSERT_TAIL(&devfs_dev_ops_list, found, link); |
| 2378 | } |
| 2379 | |
| 2380 | KKASSERT(found); |
| 2381 | |
| 2382 | if (found->ref_count == 0) { |
| 2383 | found->id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255); |
| 2384 | if (found->id == -1) { |
| 2385 | /* Ran out of unique ids */ |
| 2386 | devfs_debug(DEVFS_DEBUG_WARNING, |
| 2387 | "devfs_reference_ops: WARNING: ran out of unique ids\n"); |
| 2388 | } |
| 2389 | } |
| 2390 | unit = found->id; |
| 2391 | ++found->ref_count; |
| 2392 | |
| 2393 | return unit; |
| 2394 | } |
| 2395 | |
| 2396 | void |
| 2397 | devfs_release_ops(struct dev_ops *ops) |
| 2398 | { |
| 2399 | struct devfs_dev_ops *found = NULL; |
| 2400 | struct devfs_dev_ops *devops; |
| 2401 | |
| 2402 | TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) { |
| 2403 | if (devops->ops == ops) { |
| 2404 | found = devops; |
| 2405 | break; |
| 2406 | } |
| 2407 | } |
| 2408 | |
| 2409 | KKASSERT(found); |
| 2410 | |
| 2411 | --found->ref_count; |
| 2412 | |
| 2413 | if (found->ref_count == 0) { |
| 2414 | TAILQ_REMOVE(&devfs_dev_ops_list, found, link); |
| 2415 | devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), found->id); |
| 2416 | kfree(found, M_DEVFS); |
| 2417 | } |
| 2418 | } |
| 2419 | |
| 2420 | /* |
| 2421 | * Wait for asynchronous messages to complete in the devfs helper |
| 2422 | * thread, then return. Do nothing if the helper thread is dead |
| 2423 | * or we are being indirectly called from the helper thread itself. |
| 2424 | */ |
| 2425 | void |
| 2426 | devfs_config(void) |
| 2427 | { |
| 2428 | devfs_msg_t msg; |
| 2429 | |
| 2430 | if (devfs_run && curthread != td_core) { |
| 2431 | msg = devfs_msg_get(); |
| 2432 | msg = devfs_msg_send_sync(DEVFS_SYNC, msg); |
| 2433 | devfs_msg_put(msg); |
| 2434 | } |
| 2435 | } |
| 2436 | |
| 2437 | /* |
| 2438 | * Called on init of devfs; creates the objcaches and |
| 2439 | * spawns off the devfs core thread. Also initializes |
| 2440 | * locks. |
| 2441 | */ |
| 2442 | static void |
| 2443 | devfs_init(void) |
| 2444 | { |
| 2445 | devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n"); |
| 2446 | /* Create objcaches for nodes, msgs and devs */ |
| 2447 | devfs_node_cache = objcache_create("devfs-node-cache", 0, 0, |
| 2448 | NULL, NULL, NULL, |
| 2449 | objcache_malloc_alloc, |
| 2450 | objcache_malloc_free, |
| 2451 | &devfs_node_malloc_args ); |
| 2452 | |
| 2453 | devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0, |
| 2454 | NULL, NULL, NULL, |
| 2455 | objcache_malloc_alloc, |
| 2456 | objcache_malloc_free, |
| 2457 | &devfs_msg_malloc_args ); |
| 2458 | |
| 2459 | devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0, |
| 2460 | NULL, NULL, NULL, |
| 2461 | objcache_malloc_alloc, |
| 2462 | objcache_malloc_free, |
| 2463 | &devfs_dev_malloc_args ); |
| 2464 | |
| 2465 | devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id)); |
| 2466 | |
| 2467 | /* Initialize the reply-only port which acts as a message drain */ |
| 2468 | lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply); |
| 2469 | |
| 2470 | /* Initialize *THE* devfs lock */ |
| 2471 | lockinit(&devfs_lock, "devfs_core lock", 0, 0); |
| 2472 | |
| 2473 | lockmgr(&devfs_lock, LK_EXCLUSIVE); |
| 2474 | lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL, |
| 2475 | 0, 0, "devfs_msg_core"); |
| 2476 | while (devfs_run == 0) |
| 2477 | lksleep(td_core, &devfs_lock, 0, "devfsc", 0); |
| 2478 | lockmgr(&devfs_lock, LK_RELEASE); |
| 2479 | |
| 2480 | devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n"); |
| 2481 | } |
| 2482 | |
| 2483 | /* |
| 2484 | * Called on unload of devfs; takes care of destroying the core |
| 2485 | * and the objcaches. Also removes aliases that are no longer needed. |
| 2486 | */ |
| 2487 | static void |
| 2488 | devfs_uninit(void) |
| 2489 | { |
| 2490 | devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n"); |
| 2491 | |
| 2492 | devfs_msg_send(DEVFS_TERMINATE_CORE, NULL); |
| 2493 | while (devfs_run) |
| 2494 | tsleep(td_core, 0, "devfsc", hz*10); |
| 2495 | tsleep(td_core, 0, "devfsc", hz); |
| 2496 | |
| 2497 | devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id)); |
| 2498 | |
| 2499 | /* Destroy the objcaches */ |
| 2500 | objcache_destroy(devfs_msg_cache); |
| 2501 | objcache_destroy(devfs_node_cache); |
| 2502 | objcache_destroy(devfs_dev_cache); |
| 2503 | |
| 2504 | devfs_alias_reap(); |
| 2505 | } |
| 2506 | |
| 2507 | /* |
| 2508 | * This is a sysctl handler to assist userland devname(3) to |
| 2509 | * find the device name for a given udev. |
| 2510 | */ |
| 2511 | static int |
| 2512 | devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS) |
| 2513 | { |
| 2514 | udev_t udev; |
| 2515 | cdev_t found; |
| 2516 | int error; |
| 2517 | |
| 2518 | |
| 2519 | if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t)))) |
| 2520 | return (error); |
| 2521 | |
| 2522 | devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev); |
| 2523 | |
| 2524 | if (udev == NOUDEV) |
| 2525 | return(EINVAL); |
| 2526 | |
| 2527 | if ((found = devfs_find_device_by_udev(udev)) == NULL) |
| 2528 | return(ENOENT); |
| 2529 | |
| 2530 | return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1)); |
| 2531 | } |
| 2532 | |
| 2533 | |
| 2534 | SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY, |
| 2535 | NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)"); |
| 2536 | |
| 2537 | SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs"); |
| 2538 | TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable); |
| 2539 | SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable, |
| 2540 | 0, "Enable DevFS debugging"); |
| 2541 | |
| 2542 | SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, |
| 2543 | devfs_init, NULL); |
| 2544 | SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, |
| 2545 | devfs_uninit, NULL); |
| 2546 | |
| 2547 | /* |
| 2548 | * WildCmp() - compare wild string to sane string |
| 2549 | * |
| 2550 | * Returns 0 on success, -1 on failure. |
| 2551 | */ |
| 2552 | static int |
| 2553 | wildCmp(const char **mary, int d, const char *w, const char *s) |
| 2554 | { |
| 2555 | int i; |
| 2556 | |
| 2557 | /* |
| 2558 | * skip fixed portion |
| 2559 | */ |
| 2560 | for (;;) { |
| 2561 | switch(*w) { |
| 2562 | case '*': |
| 2563 | /* |
| 2564 | * optimize terminator |
| 2565 | */ |
| 2566 | if (w[1] == 0) |
| 2567 | return(0); |
| 2568 | if (w[1] != '?' && w[1] != '*') { |
| 2569 | /* |
| 2570 | * optimize * followed by non-wild |
| 2571 | */ |
| 2572 | for (i = 0; s + i < mary[d]; ++i) { |
| 2573 | if (s[i] == w[1] && wildCmp(mary, d + 1, w + 1, s + i) == 0) |
| 2574 | return(0); |
| 2575 | } |
| 2576 | } else { |
| 2577 | /* |
| 2578 | * less-optimal |
| 2579 | */ |
| 2580 | for (i = 0; s + i < mary[d]; ++i) { |
| 2581 | if (wildCmp(mary, d + 1, w + 1, s + i) == 0) |
| 2582 | return(0); |
| 2583 | } |
| 2584 | } |
| 2585 | mary[d] = s; |
| 2586 | return(-1); |
| 2587 | case '?': |
| 2588 | if (*s == 0) |
| 2589 | return(-1); |
| 2590 | ++w; |
| 2591 | ++s; |
| 2592 | break; |
| 2593 | default: |
| 2594 | if (*w != *s) |
| 2595 | return(-1); |
| 2596 | if (*w == 0) /* terminator */ |
| 2597 | return(0); |
| 2598 | ++w; |
| 2599 | ++s; |
| 2600 | break; |
| 2601 | } |
| 2602 | } |
| 2603 | /* not reached */ |
| 2604 | return(-1); |
| 2605 | } |
| 2606 | |
| 2607 | |
| 2608 | /* |
| 2609 | * WildCaseCmp() - compare wild string to sane string, case insensitive |
| 2610 | * |
| 2611 | * Returns 0 on success, -1 on failure. |
| 2612 | */ |
| 2613 | static int |
| 2614 | wildCaseCmp(const char **mary, int d, const char *w, const char *s) |
| 2615 | { |
| 2616 | int i; |
| 2617 | |
| 2618 | /* |
| 2619 | * skip fixed portion |
| 2620 | */ |
| 2621 | for (;;) { |
| 2622 | switch(*w) { |
| 2623 | case '*': |
| 2624 | /* |
| 2625 | * optimize terminator |
| 2626 | */ |
| 2627 | if (w[1] == 0) |
| 2628 | return(0); |
| 2629 | if (w[1] != '?' && w[1] != '*') { |
| 2630 | /* |
| 2631 | * optimize * followed by non-wild |
| 2632 | */ |
| 2633 | for (i = 0; s + i < mary[d]; ++i) { |
| 2634 | if (s[i] == w[1] && wildCaseCmp(mary, d + 1, w + 1, s + i) == 0) |
| 2635 | return(0); |
| 2636 | } |
| 2637 | } else { |
| 2638 | /* |
| 2639 | * less-optimal |
| 2640 | */ |
| 2641 | for (i = 0; s + i < mary[d]; ++i) { |
| 2642 | if (wildCaseCmp(mary, d + 1, w + 1, s + i) == 0) |
| 2643 | return(0); |
| 2644 | } |
| 2645 | } |
| 2646 | mary[d] = s; |
| 2647 | return(-1); |
| 2648 | case '?': |
| 2649 | if (*s == 0) |
| 2650 | return(-1); |
| 2651 | ++w; |
| 2652 | ++s; |
| 2653 | break; |
| 2654 | default: |
| 2655 | if (*w != *s) { |
| 2656 | #define tolower(x) ((x >= 'A' && x <= 'Z')?(x+('a'-'A')):(x)) |
| 2657 | if (tolower(*w) != tolower(*s)) |
| 2658 | return(-1); |
| 2659 | } |
| 2660 | if (*w == 0) /* terminator */ |
| 2661 | return(0); |
| 2662 | ++w; |
| 2663 | ++s; |
| 2664 | break; |
| 2665 | } |
| 2666 | } |
| 2667 | /* not reached */ |
| 2668 | return(-1); |
| 2669 | } |
| 2670 | |
| 2671 | int |
| 2672 | devfs_WildCmp(const char *w, const char *s) |
| 2673 | { |
| 2674 | int i; |
| 2675 | int c; |
| 2676 | int slen = strlen(s); |
| 2677 | const char **mary; |
| 2678 | |
| 2679 | for (i = c = 0; w[i]; ++i) { |
| 2680 | if (w[i] == '*') |
| 2681 | ++c; |
| 2682 | } |
| 2683 | mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK); |
| 2684 | for (i = 0; i < c; ++i) |
| 2685 | mary[i] = s + slen; |
| 2686 | i = wildCmp(mary, 0, w, s); |
| 2687 | kfree(mary, M_DEVFS); |
| 2688 | return(i); |
| 2689 | } |
| 2690 | |
| 2691 | int |
| 2692 | devfs_WildCaseCmp(const char *w, const char *s) |
| 2693 | { |
| 2694 | int i; |
| 2695 | int c; |
| 2696 | int slen = strlen(s); |
| 2697 | const char **mary; |
| 2698 | |
| 2699 | for (i = c = 0; w[i]; ++i) { |
| 2700 | if (w[i] == '*') |
| 2701 | ++c; |
| 2702 | } |
| 2703 | mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK); |
| 2704 | for (i = 0; i < c; ++i) |
| 2705 | mary[i] = s + slen; |
| 2706 | i = wildCaseCmp(mary, 0, w, s); |
| 2707 | kfree(mary, M_DEVFS); |
| 2708 | return(i); |
| 2709 | } |
| 2710 | |