kevent: Restore old EV_EOF semantics
[dragonfly.git] / sys / vfs / devfs / devfs_core.c
CommitLineData
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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>
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42#include <sys/sysctl.h>
43#include <sys/ucred.h>
44#include <sys/param.h>
7cbab9da 45#include <sys/systm.h>
2c1e28dd
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46#include <sys/devfs.h>
47#include <sys/devfs_rules.h>
3a3826b3 48#include <sys/udev.h>
21864bc5 49
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50#include <sys/msgport2.h>
51#include <sys/spinlock2.h>
52#include <sys/mplock2.h>
53#include <sys/sysref2.h>
54
21864bc5 55MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations");
7cbab9da 56DEVFS_DECLARE_CLONE_BITMAP(ops_id);
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57/*
58 * SYSREF Integration - reference counting, allocation,
59 * sysid and syslink integration.
60 */
61static void devfs_cdev_terminate(cdev_t dev);
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62static void devfs_cdev_lock(cdev_t dev);
63static void devfs_cdev_unlock(cdev_t dev);
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64static 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),
521f81c7 70 .nom_cache = 32,
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71 .flags = 0,
72 .ops = {
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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
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76 }
77};
78
79static struct objcache *devfs_node_cache;
80static struct objcache *devfs_msg_cache;
81static struct objcache *devfs_dev_cache;
82
83static struct objcache_malloc_args devfs_node_malloc_args = {
84 sizeof(struct devfs_node), M_DEVFS };
85struct objcache_malloc_args devfs_msg_malloc_args = {
86 sizeof(struct devfs_msg), M_DEVFS };
87struct objcache_malloc_args devfs_dev_malloc_args = {
88 sizeof(struct cdev), M_DEVFS };
89
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90static struct devfs_dev_head devfs_dev_list =
91 TAILQ_HEAD_INITIALIZER(devfs_dev_list);
92static struct devfs_mnt_head devfs_mnt_list =
93 TAILQ_HEAD_INITIALIZER(devfs_mnt_list);
94static struct devfs_chandler_head devfs_chandler_list =
95 TAILQ_HEAD_INITIALIZER(devfs_chandler_list);
96static struct devfs_alias_head devfs_alias_list =
97 TAILQ_HEAD_INITIALIZER(devfs_alias_list);
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98static struct devfs_dev_ops_head devfs_dev_ops_list =
99 TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list);
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100
101struct lock devfs_lock;
102static struct lwkt_port devfs_dispose_port;
103static struct lwkt_port devfs_msg_port;
104static struct thread *td_core;
21864bc5 105
21864bc5 106static struct spinlock ino_lock;
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107static ino_t d_ino;
108static int devfs_debug_enable;
109static int devfs_run;
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110
111static ino_t devfs_fetch_ino(void);
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112static int devfs_create_all_dev_worker(struct devfs_node *);
113static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int);
114static int devfs_destroy_dev_worker(cdev_t);
72ea429e 115static int devfs_destroy_related_worker(cdev_t);
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116static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int);
117static int devfs_propagate_dev(cdev_t, int);
ca8d7677 118static int devfs_unlink_dev(cdev_t dev);
d0fe8596 119static void devfs_msg_exec(devfs_msg_t msg);
21864bc5 120
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121static int devfs_chandler_add_worker(const char *, d_clone_t *);
122static int devfs_chandler_del_worker(const char *);
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123
124static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
125static void devfs_msg_core(void *);
126
127static int devfs_find_device_by_name_worker(devfs_msg_t);
128static int devfs_find_device_by_udev_worker(devfs_msg_t);
129
130static int devfs_apply_reset_rules_caller(char *, int);
21864bc5 131
3a3826b3 132static int devfs_scan_callback_worker(devfs_scan_t *, void *);
21864bc5 133
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134static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *,
135 char *, size_t, int);
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136
137static int devfs_make_alias_worker(struct devfs_alias *);
8312ca30 138static int devfs_destroy_alias_worker(struct devfs_alias *);
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139static int devfs_alias_remove(cdev_t);
140static int devfs_alias_reap(void);
8312ca30 141static int devfs_alias_propagate(struct devfs_alias *, int);
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142static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *);
143static int devfs_alias_check_create(struct devfs_node *);
144
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145static int devfs_clr_related_flag_worker(cdev_t, uint32_t);
146static int devfs_destroy_related_without_flag_worker(cdev_t, uint32_t);
ca8d7677 147
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148static void *devfs_reaperp_callback(struct devfs_node *, void *);
149static void *devfs_gc_dirs_callback(struct devfs_node *, void *);
150static void *devfs_gc_links_callback(struct devfs_node *, struct devfs_node *);
151static void *
152devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *);
153
21864bc5 154/*
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155 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function
156 * using kvprintf
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157 */
158int
159devfs_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/*
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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
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176 */
177struct devfs_node *
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178devfs_allocp(devfs_nodetype devfsnodetype, char *name,
179 struct devfs_node *parent, struct mount *mp, cdev_t dev)
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180{
181 struct devfs_node *node = NULL;
182 size_t namlen = strlen(name);
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183
184 node = objcache_get(devfs_node_cache, M_WAITOK);
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185 bzero(node, sizeof(*node));
186
d4f19b8b 187 atomic_add_long(&DEVFS_MNTDATA(mp)->leak_count, 1);
21864bc5 188
ca8d7677 189 node->d_dev = NULL;
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190 node->nchildren = 1;
191 node->mp = mp;
192 node->d_dir.d_ino = devfs_fetch_ino();
21864bc5 193
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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;
21864bc5 206
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207 switch (devfsnodetype) {
208 case Proot:
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209 /*
210 * Ensure that we don't recycle the root vnode by marking it as
211 * linked into the topology.
212 */
894bbb25 213 node->flags |= DEVFS_NODE_LINKED;
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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;
21864bc5 232
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233 node->mode = dev->si_perms;
234 node->uid = dev->si_uid;
235 node->gid = dev->si_gid;
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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
bc185c5a 248 /* Initialize the dirent structure of each devfs vnode */
21864bc5 249 node->d_dir.d_namlen = namlen;
ca8d7677 250 node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK);
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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
bc185c5a 257 /* Initialize *time members */
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258 nanotime(&node->atime);
259 node->mtime = node->ctime = node->atime;
260
261 /*
262 * Associate with parent as last step, clean out namecache
263 * reference.
264 */
21864bc5 265 if ((parent != NULL) &&
ca8d7677 266 ((parent->node_type == Proot) || (parent->node_type == Pdir))) {
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267 parent->nchildren++;
268 node->cookie = parent->cookie_jar++;
269 node->flags |= DEVFS_NODE_LINKED;
ca8d7677 270 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link);
21864bc5 271
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272 /* This forces negative namecache lookups to clear */
273 ++mp->mnt_namecache_gen;
274 }
21864bc5 275
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276 /* Apply rules */
277 devfs_rule_check_apply(node, NULL);
278
d4f19b8b 279 atomic_add_long(&DEVFS_MNTDATA(mp)->file_count, 1);
aee6fa68 280
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281 return node;
282}
283
284/*
285 * devfs_allocv() allocates a new vnode based on a devfs node.
286 */
287int
288devfs_allocv(struct vnode **vpp, struct devfs_node *node)
289{
290 struct vnode *vp;
291 int error = 0;
292
293 KKASSERT(node);
294
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295try_again:
296 while ((vp = node->v_node) != NULL) {
297 error = vget(vp, LK_EXCLUSIVE);
298 if (error != ENOENT) {
299 *vpp = vp;
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300 goto out;
301 }
302 }
21864bc5 303
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304 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0)
305 goto out;
306
307 vp = *vpp;
308
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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;
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317
318 switch (node->node_type) {
319 case Proot:
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320 vsetflags(vp, VROOT);
321 /* fall through */
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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;
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336 KKASSERT(node->d_dev);
337
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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;
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343 break;
344
345 default:
346 panic("devfs_allocv: unknown node type");
347 }
348
349out:
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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 */
357int
358devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype,
bc185c5a 359 char *name, struct devfs_node *parent, cdev_t dev)
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360{
361 struct devfs_node *node;
362
21864bc5 363 node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
bc185c5a 364
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365 if (node != NULL)
366 devfs_allocv(vpp, node);
367 else
368 *vpp = NULL;
369
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370 return 0;
371}
372
373/*
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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.
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380 *
381 * The core lock is not necessarily held on call and must be temporarily
382 * released if it is to avoid a deadlock.
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383 */
384int
385devfs_freep(struct devfs_node *node)
386{
ca8d7677 387 struct vnode *vp;
d4f19b8b 388 int relock;
ca8d7677 389
21864bc5 390 KKASSERT(node);
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391 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) ||
392 (node->node_type == Proot));
21864bc5 393
ca8d7677 394 /*
a4141af4 395 * Protect against double frees
ca8d7677 396 */
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397 KKASSERT((node->flags & DEVFS_DESTROYED) == 0);
398 node->flags |= DEVFS_DESTROYED;
21864bc5 399
ca8d7677 400 /*
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401 * Avoid deadlocks between devfs_lock and the vnode lock when
402 * disassociating the vnode (stress2 pty vs ls -la /dev/pts).
e23485a5 403 *
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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.
ca8d7677 407 */
d4f19b8b
MD
408 if (lockstatus(&devfs_lock, curthread) == LK_EXCLUSIVE) {
409 lockmgr(&devfs_lock, LK_RELEASE);
410 relock = 1;
411 } else {
412 relock = 0;
413 }
a4141af4 414
e23485a5
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415 while ((vp = node->v_node) != NULL) {
416 if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0)
417 break;
9b823501 418 v_release_rdev(vp);
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419 vp->v_data = NULL;
420 node->v_node = NULL;
71f27d2d 421 cache_inval_vp(vp, CINV_DESTROY);
e23485a5 422 vput(vp);
ca8d7677 423 }
a4141af4
MD
424
425 /*
426 * Remaining cleanup
427 */
d4f19b8b 428 atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->leak_count, 1);
a4141af4
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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
4062d050 440 if (node->d_dir.d_name) {
ca8d7677 441 kfree(node->d_dir.d_name, M_DEVFS);
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442 node->d_dir.d_name = NULL;
443 }
d4f19b8b 444 atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->file_count, 1);
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445 objcache_put(devfs_node_cache, node);
446
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447 if (relock)
448 lockmgr(&devfs_lock, LK_EXCLUSIVE);
449
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450 return 0;
451}
452
453/*
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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.
21864bc5
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459 */
460int
461devfs_unlinkp(struct devfs_node *node)
462{
463 struct devfs_node *parent;
464 KKASSERT(node);
465
bc185c5a
AH
466 /*
467 * Add the node to the orphan list, so it is referenced somewhere, to
468 * so we don't leak it.
469 */
21864bc5 470 devfs_tracer_add_orphan(node);
bc185c5a 471
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472 parent = node->parent;
473
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474 /*
475 * If the parent is known we can unlink the node out of the topology
476 */
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477 if (parent) {
478 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
479 parent->nchildren--;
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480 node->flags &= ~DEVFS_NODE_LINKED;
481 }
8312ca30 482
21864bc5 483 node->parent = NULL;
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484 return 0;
485}
486
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487void *
488devfs_iterate_topology(struct devfs_node *node,
489 devfs_iterate_callback_t *callback, void *arg1)
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490{
491 struct devfs_node *node1, *node2;
66abefa5 492 void *ret = NULL;
21864bc5 493
21864bc5 494 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
21864bc5 495 if (node->nchildren > 2) {
ca8d7677 496 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node),
bc185c5a 497 link, node2) {
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498 if ((ret = devfs_iterate_topology(node1, callback, arg1)))
499 return ret;
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500 }
501 }
502 }
21864bc5 503
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504 ret = callback(node, arg1);
505 return ret;
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506}
507
508/*
66abefa5
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509 * devfs_reaperp() is a recursive function that iterates through all the
510 * topology, unlinking and freeing all devfs nodes.
21864bc5 511 */
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512static void *
513devfs_reaperp_callback(struct devfs_node *node, void *unused)
21864bc5 514{
21864bc5 515 devfs_unlinkp(node);
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516 devfs_freep(node);
517
66abefa5 518 return NULL;
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519}
520
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AH
521static void *
522devfs_gc_dirs_callback(struct devfs_node *node, void *unused)
21864bc5 523{
66abefa5 524 if (node->node_type == Pdir) {
39a08947
AH
525 if ((node->nchildren == 2) &&
526 !(node->flags & DEVFS_USER_CREATED)) {
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527 devfs_unlinkp(node);
528 devfs_freep(node);
529 }
530 }
531
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AH
532 return NULL;
533}
534
535static void *
536devfs_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;
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544}
545
546/*
66abefa5
AH
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.
21864bc5 550 */
66abefa5
AH
551int
552devfs_gc(struct devfs_node *node)
21864bc5 553{
66abefa5 554 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
21864bc5 555
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AH
556 if (node->nlinks > 0)
557 devfs_iterate_topology(root_node,
558 (devfs_iterate_callback_t *)devfs_gc_links_callback, node);
21864bc5 559
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AH
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);
21864bc5 565
66abefa5 566 return 0;
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567}
568
569/*
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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.
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575 */
576int
577devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
578{
ca8d7677 579 reference_dev(dev);
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AH
580 devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
581
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582 return 0;
583}
584
585/*
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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.
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588 */
589int
590devfs_destroy_dev(cdev_t dev)
591{
592 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
593 return 0;
594}
595
596/*
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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.
21864bc5
MD
600 */
601int
602devfs_mount_add(struct devfs_mnt_data *mnt)
603{
604 devfs_msg_t msg;
605
606 msg = devfs_msg_get();
ca8d7677 607 msg->mdv_mnt = mnt;
21864bc5
MD
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 */
618int
619devfs_mount_del(struct devfs_mnt_data *mnt)
620{
621 devfs_msg_t msg;
622
623 msg = devfs_msg_get();
ca8d7677 624 msg->mdv_mnt = mnt;
21864bc5
MD
625 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
626 devfs_msg_put(msg);
627
628 return 0;
629}
630
631/*
72ea429e 632 * devfs_destroy_related() is the synchronous entry point for device
bc185c5a
AH
633 * destruction by subname. It just sends a message with the relevant details to
634 * the devfs core.
21864bc5
MD
635 */
636int
72ea429e 637devfs_destroy_related(cdev_t dev)
21864bc5 638{
ca8d7677
MD
639 devfs_msg_t msg;
640
641 msg = devfs_msg_get();
72ea429e
AH
642 msg->mdv_load = dev;
643 msg = devfs_msg_send_sync(DEVFS_DESTROY_RELATED, msg);
ca8d7677
MD
644 devfs_msg_put(msg);
645 return 0;
646}
647
648int
72ea429e 649devfs_clr_related_flag(cdev_t dev, uint32_t flag)
ca8d7677
MD
650{
651 devfs_msg_t msg;
652
653 msg = devfs_msg_get();
72ea429e 654 msg->mdv_flags.dev = dev;
ca8d7677 655 msg->mdv_flags.flag = flag;
72ea429e 656 msg = devfs_msg_send_sync(DEVFS_CLR_RELATED_FLAG, msg);
ca8d7677
MD
657 devfs_msg_put(msg);
658
659 return 0;
660}
661
662int
72ea429e 663devfs_destroy_related_without_flag(cdev_t dev, uint32_t flag)
ca8d7677
MD
664{
665 devfs_msg_t msg;
666
667 msg = devfs_msg_get();
72ea429e 668 msg->mdv_flags.dev = dev;
ca8d7677 669 msg->mdv_flags.flag = flag;
72ea429e 670 msg = devfs_msg_send_sync(DEVFS_DESTROY_RELATED_WO_FLAG, msg);
ca8d7677
MD
671 devfs_msg_put(msg);
672
21864bc5
MD
673 return 0;
674}
675
676/*
ca8d7677
MD
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.
21864bc5
MD
680 */
681int
682devfs_create_all_dev(struct devfs_node *root)
683{
684 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
685 return 0;
686}
687
688/*
ca8d7677
MD
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.
21864bc5
MD
692 */
693int
694devfs_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/*
ca8d7677
MD
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.
21864bc5
MD
704 */
705int
07dfa375 706devfs_clone_handler_add(const char *name, d_clone_t *nhandler)
21864bc5 707{
ca8d7677
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708 devfs_msg_t msg;
709
710 msg = devfs_msg_get();
d0fe8596 711 msg->mdv_chandler.name = name;
ca8d7677
MD
712 msg->mdv_chandler.nhandler = nhandler;
713 msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg);
714 devfs_msg_put(msg);
21864bc5
MD
715 return 0;
716}
717
718/*
ca8d7677
MD
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.
21864bc5
MD
722 */
723int
07dfa375 724devfs_clone_handler_del(const char *name)
21864bc5 725{
ca8d7677
MD
726 devfs_msg_t msg;
727
728 msg = devfs_msg_get();
d0fe8596 729 msg->mdv_chandler.name = name;
ca8d7677
MD
730 msg->mdv_chandler.nhandler = NULL;
731 msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg);
732 devfs_msg_put(msg);
21864bc5
MD
733 return 0;
734}
735
736/*
ca8d7677
MD
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.
21864bc5
MD
740 */
741cdev_t
742devfs_find_device_by_name(const char *fmt, ...)
743{
744 cdev_t found = NULL;
745 devfs_msg_t msg;
da655383 746 char *target;
21864bc5 747 __va_list ap;
21864bc5
MD
748
749 if (fmt == NULL)
750 return NULL;
751
21864bc5 752 __va_start(ap, fmt);
da655383 753 kvasnrprintf(&target, PATH_MAX, 10, fmt, ap);
21864bc5
MD
754 __va_end(ap);
755
21864bc5 756 msg = devfs_msg_get();
ca8d7677 757 msg->mdv_name = target;
21864bc5 758 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
ca8d7677 759 found = msg->mdv_cdev;
21864bc5 760 devfs_msg_put(msg);
da655383 761 kvasfree(&target);
21864bc5 762
21864bc5
MD
763 return found;
764}
765
766/*
ca8d7677
MD
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.
21864bc5
MD
770 */
771cdev_t
772devfs_find_device_by_udev(udev_t udev)
773{
774 cdev_t found = NULL;
775 devfs_msg_t msg;
776
777 msg = devfs_msg_get();
ca8d7677 778 msg->mdv_udev = udev;
21864bc5 779 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
ca8d7677 780 found = msg->mdv_cdev;
21864bc5
MD
781 devfs_msg_put(msg);
782
ca8d7677
MD
783 devfs_debug(DEVFS_DEBUG_DEBUG,
784 "devfs_find_device_by_udev found? %s -end:3-\n",
785 ((found) ? found->si_name:"NO"));
21864bc5
MD
786 return found;
787}
788
fa7e6f37
AH
789struct vnode *
790devfs_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
21864bc5 809/*
ca8d7677
MD
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.
21864bc5
MD
813 */
814int
07dfa375 815devfs_make_alias(const char *name, cdev_t dev_target)
21864bc5 816{
ca8d7677 817 struct devfs_alias *alias;
5298e788
AH
818 size_t len;
819
820 len = strlen(name);
ca8d7677
MD
821
822 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
07dfa375 823 alias->name = kstrdup(name, M_DEVFS);
5298e788 824 alias->namlen = len;
21864bc5
MD
825 alias->dev_target = dev_target;
826
827 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
828 return 0;
829}
830
8312ca30
AH
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 */
836int
837devfs_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
21864bc5 853/*
ca8d7677
MD
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.
21864bc5
MD
857 */
858int
859devfs_apply_rules(char *mntto)
860{
861 char *new_name;
21864bc5 862
07dfa375 863 new_name = kstrdup(mntto, M_DEVFS);
21864bc5 864 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
bc185c5a 865
21864bc5
MD
866 return 0;
867}
868
869/*
bc185c5a
AH
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.
21864bc5
MD
872 */
873int
874devfs_reset_rules(char *mntto)
875{
876 char *new_name;
21864bc5 877
07dfa375 878 new_name = kstrdup(mntto, M_DEVFS);
21864bc5 879 devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
bc185c5a 880
21864bc5
MD
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 */
890int
3a3826b3 891devfs_scan_callback(devfs_scan_t *callback, void *arg)
21864bc5
MD
892{
893 devfs_msg_t msg;
894
21864bc5
MD
895 KKASSERT(sizeof(callback) == sizeof(void *));
896
897 msg = devfs_msg_get();
ca8d7677 898 msg->mdv_load = callback;
3a3826b3 899 msg->mdv_load2 = arg;
21864bc5
MD
900 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
901 devfs_msg_put(msg);
902
903 return 0;
904}
905
906
907/*
bc185c5a
AH
908 * Acts as a message drain. Any message that is replied to here gets destroyed
909 * and the memory freed.
21864bc5
MD
910 */
911static void
912devfs_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 */
920devfs_msg_t
b815579b 921devfs_msg_get(void)
21864bc5
MD
922{
923 return objcache_get(devfs_msg_cache, M_WAITOK);
924}
925
926/*
927 * devfs_msg_put deallocates a given devfs msg.
928 */
929int
930devfs_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.
d0fe8596
MD
939 *
940 * If the current thread is the devfs_msg_port thread we execute the
941 * operation synchronously.
21864bc5 942 */
d0fe8596 943void
21864bc5
MD
944devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
945{
946 lwkt_port_t port = &devfs_msg_port;
947
d0fe8596 948 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
21864bc5 949
d0fe8596 950 devfs_msg->hdr.u.ms_result = cmd;
21864bc5 951
d0fe8596
MD
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 }
21864bc5
MD
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 */
965devfs_msg_t
966devfs_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);
d0fe8596 973 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
21864bc5 974
d0fe8596 975 devfs_msg->hdr.u.ms_result = cmd;
21864bc5 976
d0fe8596 977 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
21864bc5
MD
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 */
d0fe8596 986void
21864bc5
MD
987devfs_msg_send_generic(uint32_t cmd, void *load)
988{
d0fe8596 989 devfs_msg_t devfs_msg = devfs_msg_get();
21864bc5 990
d0fe8596
MD
991 devfs_msg->mdv_load = load;
992 devfs_msg_send(cmd, devfs_msg);
21864bc5
MD
993}
994
995/*
996 * sends a message with a name argument.
997 */
d0fe8596 998void
21864bc5
MD
999devfs_msg_send_name(uint32_t cmd, char *name)
1000{
d0fe8596 1001 devfs_msg_t devfs_msg = devfs_msg_get();
21864bc5 1002
d0fe8596
MD
1003 devfs_msg->mdv_name = name;
1004 devfs_msg_send(cmd, devfs_msg);
21864bc5
MD
1005}
1006
1007/*
1008 * sends a message with a mount argument.
1009 */
d0fe8596 1010void
21864bc5
MD
1011devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt)
1012{
d0fe8596 1013 devfs_msg_t devfs_msg = devfs_msg_get();
21864bc5 1014
d0fe8596
MD
1015 devfs_msg->mdv_mnt = mnt;
1016 devfs_msg_send(cmd, devfs_msg);
21864bc5
MD
1017}
1018
1019/*
1020 * sends a message with an ops argument.
1021 */
d0fe8596 1022void
21864bc5
MD
1023devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor)
1024{
d0fe8596 1025 devfs_msg_t devfs_msg = devfs_msg_get();
21864bc5 1026
d0fe8596
MD
1027 devfs_msg->mdv_ops.ops = ops;
1028 devfs_msg->mdv_ops.minor = minor;
1029 devfs_msg_send(cmd, devfs_msg);
21864bc5
MD
1030}
1031
1032/*
1033 * sends a message with a clone handler argument.
1034 */
d0fe8596 1035void
21864bc5
MD
1036devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler)
1037{
d0fe8596 1038 devfs_msg_t devfs_msg = devfs_msg_get();
21864bc5 1039
d0fe8596
MD
1040 devfs_msg->mdv_chandler.name = name;
1041 devfs_msg->mdv_chandler.nhandler = handler;
1042 devfs_msg_send(cmd, devfs_msg);
21864bc5
MD
1043}
1044
1045/*
1046 * sends a message with a device argument.
1047 */
d0fe8596 1048void
21864bc5
MD
1049devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms)
1050{
d0fe8596
MD
1051 devfs_msg_t devfs_msg = devfs_msg_get();
1052
1053 devfs_msg->mdv_dev.dev = dev;
ca8d7677
MD
1054 devfs_msg->mdv_dev.uid = uid;
1055 devfs_msg->mdv_dev.gid = gid;
1056 devfs_msg->mdv_dev.perms = perms;
21864bc5 1057
d0fe8596 1058 devfs_msg_send(cmd, devfs_msg);
21864bc5
MD
1059}
1060
1061/*
1062 * sends a message with a link argument.
1063 */
d0fe8596 1064void
21864bc5
MD
1065devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp)
1066{
d0fe8596
MD
1067 devfs_msg_t devfs_msg = devfs_msg_get();
1068
1069 devfs_msg->mdv_link.name = name;
ca8d7677
MD
1070 devfs_msg->mdv_link.target = target;
1071 devfs_msg->mdv_link.mp = mp;
d0fe8596 1072 devfs_msg_send(cmd, devfs_msg);
21864bc5
MD
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 */
1080static void
1081devfs_msg_core(void *arg)
1082{
ca8d7677 1083 devfs_msg_t msg;
21864bc5 1084
21864bc5 1085 lwkt_initport_thread(&devfs_msg_port, curthread);
c9e9fb21
MD
1086
1087 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1088 devfs_run = 1;
bc185c5a 1089 wakeup(td_core);
c9e9fb21
MD
1090 lockmgr(&devfs_lock, LK_RELEASE);
1091
1092 get_mplock(); /* mpsafe yet? */
21864bc5 1093
d0fe8596 1094 while (devfs_run) {
ca8d7677 1095 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0);
bc185c5a 1096 devfs_debug(DEVFS_DEBUG_DEBUG,
d0fe8596
MD
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 }
c9e9fb21
MD
1102
1103 rel_mplock();
d0fe8596 1104 wakeup(td_core);
c9e9fb21 1105
d0fe8596
MD
1106 lwkt_exit();
1107}
21864bc5 1108
d0fe8596
MD
1109static void
1110devfs_msg_exec(devfs_msg_t msg)
1111{
1112 struct devfs_mnt_data *mnt;
1113 struct devfs_node *node;
1114 cdev_t dev;
fa7e6f37 1115
d0fe8596
MD
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;
72ea429e
AH
1133 case DEVFS_DESTROY_RELATED:
1134 devfs_destroy_related_worker(msg->mdv_load);
d0fe8596
MD
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);
66abefa5
AH
1152 devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback,
1153 NULL);
d0fe8596
MD
1154 if (mnt->leak_count) {
1155 devfs_debug(DEVFS_DEBUG_SHOW,
71f27d2d 1156 "Leaked %ld devfs_node elements!\n",
d0fe8596 1157 mnt->leak_count);
ca8d7677 1158 }
d0fe8596
MD
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;
8312ca30
AH
1176 case DEVFS_DESTROY_ALIAS:
1177 devfs_destroy_alias_worker((struct devfs_alias *)msg->mdv_load);
1178 break;
d0fe8596
MD
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:
3a3826b3
AH
1186 devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load,
1187 msg->mdv_load2);
d0fe8596 1188 break;
72ea429e
AH
1189 case DEVFS_CLR_RELATED_FLAG:
1190 devfs_clr_related_flag_worker(msg->mdv_flags.dev,
d0fe8596
MD
1191 msg->mdv_flags.flag);
1192 break;
72ea429e
AH
1193 case DEVFS_DESTROY_RELATED_WO_FLAG:
1194 devfs_destroy_related_without_flag_worker(msg->mdv_flags.dev,
d0fe8596
MD
1195 msg->mdv_flags.flag);
1196 break;
1197 case DEVFS_INODE_TO_VNODE:
66abefa5
AH
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);
d0fe8596
MD
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;
ca8d7677 1213 }
d0fe8596 1214 lockmgr(&devfs_lock, LK_RELEASE);
21864bc5
MD
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.
ca8d7677
MD
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.
21864bc5
MD
1224 */
1225static int
1226devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms)
1227{
1228 KKASSERT(dev);
21864bc5
MD
1229
1230 dev->si_uid = uid;
1231 dev->si_gid = gid;
1232 dev->si_perms = perms;
1233
1234 devfs_link_dev(dev);
21864bc5
MD
1235 devfs_propagate_dev(dev, 1);
1236
3a3826b3
AH
1237 udev_event_attach(dev, NULL, 0);
1238
21864bc5
MD
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 */
1247static int
1248devfs_destroy_dev_worker(cdev_t dev)
1249{
ca8d7677
MD
1250 int error;
1251
21864bc5
MD
1252 KKASSERT(dev);
1253 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1254
ca8d7677 1255 error = devfs_unlink_dev(dev);
21864bc5 1256 devfs_propagate_dev(dev, 0);
3a3826b3
AH
1257
1258 udev_event_detach(dev, NULL, 0);
1259
ca8d7677
MD
1260 if (error == 0)
1261 release_dev(dev); /* link ref */
21864bc5
MD
1262 release_dev(dev);
1263 release_dev(dev);
21864bc5 1264
21864bc5
MD
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 */
1272static int
72ea429e 1273devfs_destroy_related_worker(cdev_t needle)
21864bc5 1274{
72ea429e 1275 cdev_t dev;
21864bc5 1276
72ea429e
AH
1277restart:
1278 devfs_debug(DEVFS_DEBUG_DEBUG, "related worker: %s\n",
1279 needle->si_name);
1280 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1281 if (dev->si_parent == needle) {
1282 devfs_destroy_related_worker(dev);
bc185c5a 1283 devfs_destroy_dev_worker(dev);
72ea429e 1284 goto restart;
21864bc5 1285 }
ca8d7677
MD
1286 }
1287 return 0;
1288}
1289
1290static int
72ea429e 1291devfs_clr_related_flag_worker(cdev_t needle, uint32_t flag)
ca8d7677
MD
1292{
1293 cdev_t dev, dev1;
ca8d7677
MD
1294
1295 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
72ea429e
AH
1296 if (dev->si_parent == needle) {
1297 devfs_clr_related_flag_worker(dev, flag);
bc185c5a 1298 dev->si_flags &= ~flag;
ca8d7677
MD
1299 }
1300 }
1301
1302 return 0;
1303}
1304
1305static int
72ea429e 1306devfs_destroy_related_without_flag_worker(cdev_t needle, uint32_t flag)
ca8d7677 1307{
72ea429e 1308 cdev_t dev;
ca8d7677 1309
72ea429e
AH
1310restart:
1311 devfs_debug(DEVFS_DEBUG_DEBUG, "related_wo_flag: %s\n",
1312 needle->si_name);
1313
1314 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1315 if (dev->si_parent == needle) {
1316 devfs_destroy_related_without_flag_worker(dev, flag);
bc185c5a
AH
1317 if (!(dev->si_flags & flag)) {
1318 devfs_destroy_dev_worker(dev);
72ea429e
AH
1319 devfs_debug(DEVFS_DEBUG_DEBUG,
1320 "related_wo_flag: %s restart\n", dev->si_name);
1321 goto restart;
ca8d7677
MD
1322 }
1323 }
1324 }
21864bc5
MD
1325
1326 return 0;
1327}
1328
1329/*
1330 * Worker function that creates all device nodes on top of a devfs
1331 * root node.
1332 */
1333static int
1334devfs_create_all_dev_worker(struct devfs_node *root)
1335{
1336 cdev_t dev;
1337
1338 KKASSERT(root);
21864bc5 1339
d0fe8596 1340 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
21864bc5 1341 devfs_create_device_node(root, dev, NULL, NULL);
d0fe8596 1342 }
bc185c5a 1343
21864bc5
MD
1344 return 0;
1345}
1346
1347/*
1348 * Worker function that destroys all devices that match a specific
1349 * dev_ops and/or minor. If minor is less than 0, it is not matched
1350 * against. It also propagates all changes.
1351 */
1352static int
1353devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor)
1354{
1355 cdev_t dev, dev1;
1356
1357 KKASSERT(ops);
ca8d7677
MD
1358
1359 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1360 if (dev->si_ops != ops)
1361 continue;
1362 if ((minor < 0) || (dev->si_uminor == minor)) {
ca8d7677 1363 devfs_destroy_dev_worker(dev);
21864bc5 1364 }
ca8d7677 1365 }
bc185c5a 1366
21864bc5
MD
1367 return 0;
1368}
1369
1370/*
1371 * Worker function that registers a new clone handler in devfs.
1372 */
1373static int
07dfa375 1374devfs_chandler_add_worker(const char *name, d_clone_t *nhandler)
21864bc5
MD
1375{
1376 struct devfs_clone_handler *chandler = NULL;
1377 u_char len = strlen(name);
1378
ca8d7677 1379 if (len == 0)
21864bc5
MD
1380 return 1;
1381
ca8d7677 1382 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
bc185c5a
AH
1383 if (chandler->namlen != len)
1384 continue;
1385
1386 if (!memcmp(chandler->name, name, len)) {
1387 /* Clonable basename already exists */
1388 return 1;
21864bc5
MD
1389 }
1390 }
1391
ca8d7677 1392 chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO);
07dfa375 1393 chandler->name = kstrdup(name, M_DEVFS);
21864bc5
MD
1394 chandler->namlen = len;
1395 chandler->nhandler = nhandler;
1396
1397 TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link);
1398 return 0;
1399}
1400
1401/*
1402 * Worker function that removes a given clone handler from the
1403 * clone handler list.
1404 */
1405static int
07dfa375 1406devfs_chandler_del_worker(const char *name)
21864bc5
MD
1407{
1408 struct devfs_clone_handler *chandler, *chandler2;
1409 u_char len = strlen(name);
1410
ca8d7677 1411 if (len == 0)
21864bc5
MD
1412 return 1;
1413
ca8d7677
MD
1414 TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) {
1415 if (chandler->namlen != len)
1416 continue;
1417 if (memcmp(chandler->name, name, len))
1418 continue;
bc185c5a 1419
ca8d7677 1420 TAILQ_REMOVE(&devfs_chandler_list, chandler, link);
5298e788 1421 kfree(chandler->name, M_DEVFS);
ca8d7677 1422 kfree(chandler, M_DEVFS);
5298e788 1423 break;
21864bc5
MD
1424 }
1425
1426 return 0;
1427}
1428
1429/*
1430 * Worker function that finds a given device name and changes
1431 * the message received accordingly so that when replied to,
1432 * the answer is returned to the caller.
1433 */
1434static int
1435devfs_find_device_by_name_worker(devfs_msg_t devfs_msg)
1436{
6507240b
MD
1437 struct devfs_alias *alias;
1438 cdev_t dev;
21864bc5 1439 cdev_t found = NULL;
21864bc5 1440
6507240b
MD
1441 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1442 if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) {
21864bc5
MD
1443 found = dev;
1444 break;
1445 }
ca8d7677 1446 }
6507240b
MD
1447 if (found == NULL) {
1448 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1449 if (strcmp(devfs_msg->mdv_name, alias->name) == 0) {
1450 found = alias->dev_target;
1451 break;
1452 }
1453 }
1454 }
ca8d7677 1455 devfs_msg->mdv_cdev = found;
21864bc5
MD
1456
1457 return 0;
1458}
1459
1460/*
1461 * Worker function that finds a given device udev and changes
1462 * the message received accordingly so that when replied to,
1463 * the answer is returned to the caller.
1464 */
1465static int
1466devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg)
1467{
1468 cdev_t dev, dev1;
1469 cdev_t found = NULL;
21864bc5 1470
ca8d7677
MD
1471 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1472 if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) {
21864bc5
MD
1473 found = dev;
1474 break;
1475 }
ca8d7677
MD
1476 }
1477 devfs_msg->mdv_cdev = found;
21864bc5
MD
1478
1479 return 0;
1480}
1481
1482/*
1483 * Worker function that inserts a given alias into the
1484 * alias list, and propagates the alias to all mount
1485 * points.
1486 */
1487static int
1488devfs_make_alias_worker(struct devfs_alias *alias)
1489{
1490 struct devfs_alias *alias2;
1491 size_t len = strlen(alias->name);
1492 int found = 0;
1493
1494 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
bc185c5a
AH
1495 if (len != alias2->namlen)
1496 continue;
1497
1498 if (!memcmp(alias->name, alias2->name, len)) {
1499 found = 1;
1500 break;
21864bc5
MD
1501 }
1502 }
1503
1504 if (!found) {
bc185c5a
AH
1505 /*
1506 * The alias doesn't exist yet, so we add it to the alias list
1507 */
21864bc5 1508 TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link);
8312ca30 1509 devfs_alias_propagate(alias, 0);
3a3826b3 1510 udev_event_attach(alias->dev_target, alias->name, 1);
21864bc5 1511 } else {
5298e788 1512 devfs_debug(DEVFS_DEBUG_WARNING,
ca8d7677
MD
1513 "Warning: duplicate devfs_make_alias for %s\n",
1514 alias->name);
5298e788 1515 kfree(alias->name, M_DEVFS);
21864bc5
MD
1516 kfree(alias, M_DEVFS);
1517 }
1518
1519 return 0;
1520}
1521
8312ca30
AH
1522/*
1523 * Worker function that delete a given alias from the
1524 * alias list, and propagates the removal to all mount
1525 * points.
1526 */
1527static int
1528devfs_destroy_alias_worker(struct devfs_alias *alias)
1529{
1530 struct devfs_alias *alias2;
1531 int found = 0;
1532
1533 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1534 if (alias->dev_target != alias2->dev_target)
1535 continue;
1536
1537 if (devfs_WildCmp(alias->name, alias2->name) == 0) {
1538 found = 1;
1539 break;
1540 }
1541 }
1542
1543 if (!found) {
1544 devfs_debug(DEVFS_DEBUG_WARNING,
1545 "Warning: devfs_destroy_alias for inexistant alias: %s\n",
1546 alias->name);
1547 kfree(alias->name, M_DEVFS);
1548 kfree(alias, M_DEVFS);
1549 } else {
1550 /*
1551 * The alias exists, so we delete it from the alias list
1552 */
1553 TAILQ_REMOVE(&devfs_alias_list, alias2, link);
1554 devfs_alias_propagate(alias2, 1);
1555 udev_event_detach(alias2->dev_target, alias2->name, 1);
1556 kfree(alias->name, M_DEVFS);
1557 kfree(alias, M_DEVFS);
1558 kfree(alias2->name, M_DEVFS);
1559 kfree(alias2, M_DEVFS);
1560 }
1561
1562 return 0;
1563}
1564
21864bc5
MD
1565/*
1566 * Function that removes and frees all aliases.
1567 */
1568static int
1569devfs_alias_reap(void)
1570{
1571 struct devfs_alias *alias, *alias2;
1572
1573 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1574 TAILQ_REMOVE(&devfs_alias_list, alias, link);
8312ca30 1575 kfree(alias->name, M_DEVFS);
21864bc5
MD
1576 kfree(alias, M_DEVFS);
1577 }
1578 return 0;
1579}
1580
1581/*
1582 * Function that removes an alias matching a specific cdev and frees
1583 * it accordingly.
1584 */
1585static int
1586devfs_alias_remove(cdev_t dev)
1587{
1588 struct devfs_alias *alias, *alias2;
1589
1590 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1591 if (alias->dev_target == dev) {
1592 TAILQ_REMOVE(&devfs_alias_list, alias, link);
3a3826b3 1593 udev_event_detach(alias->dev_target, alias->name, 1);
8312ca30 1594 kfree(alias->name, M_DEVFS);
21864bc5
MD
1595 kfree(alias, M_DEVFS);
1596 }
1597 }
1598 return 0;
1599}
1600
1601/*
8312ca30
AH
1602 * This function propagates an alias addition or removal to
1603 * all mount points.
21864bc5
MD
1604 */
1605static int
8312ca30 1606devfs_alias_propagate(struct devfs_alias *alias, int remove)
21864bc5
MD
1607{
1608 struct devfs_mnt_data *mnt;
1609
1610 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
8312ca30
AH
1611 if (remove) {
1612 devfs_destroy_node(mnt->root_node, alias->name);
1613 } else {
1614 devfs_alias_apply(mnt->root_node, alias);
1615 }
21864bc5
MD
1616 }
1617 return 0;
1618}
1619
1620/*
1621 * This function is a recursive function iterating through
1622 * all device nodes in the topology and, if applicable,
1623 * creating the relevant alias for a device node.
1624 */
1625static int
1626devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias)
1627{
1628 struct devfs_node *node1, *node2;
1629
1630 KKASSERT(alias != NULL);
1631
1632 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
21864bc5 1633 if (node->nchildren > 2) {
ca8d7677 1634 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
21864bc5
MD
1635 devfs_alias_apply(node1, alias);
1636 }
1637 }
1638 } else {
1639 if (node->d_dev == alias->dev_target)
1cb12919 1640 devfs_alias_create(alias->name, node, 0);
21864bc5
MD
1641 }
1642 return 0;
1643}
1644
1645/*
1646 * This function checks if any alias possibly is applicable
1647 * to the given node. If so, the alias is created.
1648 */
1649static int
1650devfs_alias_check_create(struct devfs_node *node)
1651{
1652 struct devfs_alias *alias;
1653
1654 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1655 if (node->d_dev == alias->dev_target)
1cb12919 1656 devfs_alias_create(alias->name, node, 0);
21864bc5
MD
1657 }
1658 return 0;
1659}
1660
1661/*
1662 * This function creates an alias with a given name
1663 * linking to a given devfs node. It also increments
1664 * the link count on the target node.
1665 */
1666int
1cb12919 1667devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based)
21864bc5
MD
1668{
1669 struct mount *mp = target->mp;
1670 struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node;
1671 struct devfs_node *linknode;
21864bc5 1672 char *create_path = NULL;
da655383
MD
1673 char *name;
1674 char *name_buf;
1675 int result = 0;
21864bc5 1676
21864bc5
MD
1677 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1678
da655383 1679 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
21864bc5
MD
1680 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name);
1681
1682 if (create_path)
1683 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1684
1685
1686 if (devfs_find_device_node_by_name(parent, name)) {
bc185c5a 1687 devfs_debug(DEVFS_DEBUG_WARNING,
ca8d7677
MD
1688 "Node already exists: %s "
1689 "(devfs_make_alias_worker)!\n",
1690 name);
da655383
MD
1691 result = 1;
1692 goto done;
21864bc5
MD
1693 }
1694
21864bc5 1695 linknode = devfs_allocp(Plink, name, parent, mp, NULL);
da655383
MD
1696 if (linknode == NULL) {
1697 result = 1;
1698 goto done;
1699 }
21864bc5
MD
1700
1701 linknode->link_target = target;
1702 target->nlinks++;
21864bc5 1703
1cb12919
AH
1704 if (rule_based)
1705 linknode->flags |= DEVFS_RULE_CREATED;
1706
da655383
MD
1707done:
1708 kfree(name_buf, M_TEMP);
1709 return (result);
21864bc5
MD
1710}
1711
1712/*
1713 * This function is called by the core and handles mount point
1714 * strings. It either calls the relevant worker (devfs_apply_
1715 * reset_rules_worker) on all mountpoints or only a specific
1716 * one.
1717 */
1718static int
1719devfs_apply_reset_rules_caller(char *mountto, int apply)
1720{
21864bc5 1721 struct devfs_mnt_data *mnt;
21864bc5 1722
bc185c5a 1723 if (mountto[0] == '*') {
21864bc5 1724 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
66abefa5
AH
1725 devfs_iterate_topology(mnt->root_node,
1726 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1727 NULL);
21864bc5
MD
1728 }
1729 } else {
1730 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
9cf39e57 1731 if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) {
66abefa5
AH
1732 devfs_iterate_topology(mnt->root_node,
1733 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1734 NULL);
bc185c5a
AH
1735 break;
1736 }
21864bc5
MD
1737 }
1738 }
1739
1740 kfree(mountto, M_DEVFS);
1741 return 0;
1742}
1743
21864bc5
MD
1744/*
1745 * This function calls a given callback function for
1746 * every dev node in the devfs dev list.
1747 */
1748static int
3a3826b3 1749devfs_scan_callback_worker(devfs_scan_t *callback, void *arg)
21864bc5
MD
1750{
1751 cdev_t dev, dev1;
1752
d0fe8596 1753 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
3a3826b3 1754 callback(dev, arg);
d0fe8596 1755 }
21864bc5 1756
21864bc5
MD
1757 return 0;
1758}
1759
21864bc5
MD
1760/*
1761 * This function tries to resolve a given directory, or if not
1762 * found and creation requested, creates the given directory.
1763 */
1764static struct devfs_node *
ca8d7677
MD
1765devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name,
1766 size_t name_len, int create)
21864bc5
MD
1767{
1768 struct devfs_node *node, *found = NULL;
1769
1770 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
bc185c5a
AH
1771 if (name_len != node->d_dir.d_namlen)
1772 continue;
1773
1774 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) {
1775 found = node;
1776 break;
21864bc5
MD
1777 }
1778 }
1779
1780 if ((found == NULL) && (create)) {
1781 found = devfs_allocp(Pdir, dir_name, parent, parent->mp, NULL);
1782 }
1783
1784 return found;
1785}
1786
1787/*
1788 * This function tries to resolve a complete path. If creation is requested,
1789 * if a given part of the path cannot be resolved (because it doesn't exist),
1790 * it is created.
1791 */
1792struct devfs_node *
1793devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create)
1794{
1795 struct devfs_node *node = parent;
da655383 1796 char *buf;
21864bc5
MD
1797 size_t idx = 0;
1798
21864bc5
MD
1799 if (path == NULL)
1800 return parent;
1801
da655383 1802 buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
21864bc5 1803
da655383 1804 while (*path && idx < PATH_MAX - 1) {
21864bc5
MD
1805 if (*path != '/') {
1806 buf[idx++] = *path;
1807 } else {
1808 buf[idx] = '\0';
1809 node = devfs_resolve_or_create_dir(node, buf, idx, create);
da655383
MD
1810 if (node == NULL) {
1811 kfree(buf, M_TEMP);
21864bc5 1812 return NULL;
da655383 1813 }
21864bc5
MD
1814 idx = 0;
1815 }
da655383 1816 ++path;
21864bc5
MD
1817 }
1818 buf[idx] = '\0';
da655383
MD
1819 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1820 kfree (buf, M_TEMP);
1821 return (node);
21864bc5
MD
1822}
1823
1824/*
1825 * Takes a full path and strips it into a directory path and a name.
1826 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It
1827 * requires a working buffer with enough size to keep the whole
1828 * fullpath.
1829 */
1830int
1831devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep)
1832{
1833 char *name = NULL;
1834 char *path = NULL;
1835 size_t len = strlen(fullpath) + 1;
1836 int i;
1837
bc185c5a
AH
1838 KKASSERT((fullpath != NULL) && (buf != NULL));
1839 KKASSERT((pathp != NULL) && (namep != NULL));
21864bc5
MD
1840
1841 memcpy(buf, fullpath, len);
1842
1843 for (i = len-1; i>= 0; i--) {
1844 if (buf[i] == '/') {
1845 buf[i] = '\0';
1846 name = &(buf[i+1]);
1847 path = buf;
1848 break;
1849 }
1850 }
1851
1852 *pathp = path;
1853
1854 if (name) {
1855 *namep = name;
1856 } else {
1857 *namep = buf;
1858 }
1859
1860 return 0;
1861}
1862
1863/*
ca8d7677 1864 * This function creates a new devfs node for a given device. It can
21864bc5
MD
1865 * handle a complete path as device name, and accordingly creates
1866 * the path and the final device node.
ca8d7677
MD
1867 *
1868 * The reference count on the passed dev remains unchanged.
21864bc5
MD
1869 */
1870struct devfs_node *
ca8d7677
MD
1871devfs_create_device_node(struct devfs_node *root, cdev_t dev,
1872 char *dev_name, char *path_fmt, ...)
21864bc5
MD
1873{
1874 struct devfs_node *parent, *node = NULL;
1875 char *path = NULL;
da655383
MD
1876 char *name;
1877 char *name_buf;
21864bc5
MD
1878 __va_list ap;
1879 int i, found;
21864bc5
MD
1880 char *create_path = NULL;
1881 char *names = "pqrsPQRS";
1882
da655383 1883 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
21864bc5 1884
da655383 1885 if (path_fmt != NULL) {
21864bc5 1886 __va_start(ap, path_fmt);
da655383 1887 kvasnrprintf(&path, PATH_MAX, 10, path_fmt, ap);
21864bc5
MD
1888 __va_end(ap);
1889 }
1890
1891 parent = devfs_resolve_or_create_path(root, path, 1);
1892 KKASSERT(parent);
1893
bc185c5a
AH
1894 devfs_resolve_name_path(
1895 ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name),
1896 name_buf, &create_path, &name);
21864bc5
MD
1897
1898 if (create_path)
1899 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1900
1901
1902 if (devfs_find_device_node_by_name(parent, name)) {
bc185c5a 1903 devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: "
894bbb25 1904 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name);
21864bc5
MD
1905 goto out;
1906 }
bc185c5a 1907
21864bc5 1908 node = devfs_allocp(Pdev, name, parent, parent->mp, dev);
07dfa375 1909 nanotime(&parent->mtime);
0182b316 1910
bc185c5a
AH
1911 /*
1912 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their
1913 * directory
1914 */
1915 if ((dev) && (strlen(dev->si_name) >= 4) &&
1916 (!memcmp(dev->si_name, "ptm/", 4))) {
894bbb25
AH
1917 node->parent->flags |= DEVFS_HIDDEN;
1918 node->flags |= DEVFS_HIDDEN;
21864bc5 1919 }
bc185c5a
AH
1920
1921 /*
1922 * Ugly pty magic, to tag pty devices as such and hide them if needed.
1923 */
21864bc5
MD
1924 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3)))
1925 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1926
21864bc5
MD
1927 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) {
1928 found = 0;
1929 for (i = 0; i < strlen(names); i++) {
1930 if (name[3] == names[i]) {
1931 found = 1;
1932 break;
1933 }
1934 }
1935 if (found)
1936 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1937 }
21864bc5
MD
1938
1939out:
da655383
MD
1940 kfree(name_buf, M_TEMP);
1941 kvasfree(&path);
21864bc5
MD
1942 return node;
1943}
1944
1945/*
1946 * This function finds a given device node in the topology with a given
1947 * cdev.
1948 */
66abefa5
AH
1949void *
1950devfs_find_device_node_callback(struct devfs_node *node, cdev_t target)
21864bc5 1951{
66abefa5
AH
1952 if ((node->node_type == Pdev) && (node->d_dev == target)) {
1953 return node;
21864bc5 1954 }
21864bc5
MD
1955
1956 return NULL;
1957}
1958
1959/*
66abefa5 1960 * This function finds a device node in the given parent directory by its
21864bc5
MD
1961 * name and returns it.
1962 */
1963struct devfs_node *
1964devfs_find_device_node_by_name(struct devfs_node *parent, char *target)
1965{
1966 struct devfs_node *node, *found = NULL;
1967 size_t len = strlen(target);
1968
1969 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
bc185c5a
AH
1970 if (len != node->d_dir.d_namlen)
1971 continue;
1972
1973 if (!memcmp(node->d_dir.d_name, target, len)) {
21864bc5
MD
1974 found = node;
1975 break;
1976 }
1977 }
1978
1979 return found;
1980}
1981
66abefa5
AH
1982static void *
1983devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop)
fa7e6f37 1984{
66abefa5
AH
1985 struct vnode *vp = NULL;
1986 ino_t target = *inop;
bc185c5a 1987
fa7e6f37
AH
1988 if (node->d_dir.d_ino == target) {
1989 if (node->v_node) {
1990 vp = node->v_node;
1991 vget(vp, LK_EXCLUSIVE | LK_RETRY);
1992 vn_unlock(vp);
1993 } else {
1994 devfs_allocv(&vp, node);
1995 vn_unlock(vp);
1996 }
fa7e6f37
AH
1997 }
1998
66abefa5 1999 return vp;
fa7e6f37
AH
2000}
2001
21864bc5 2002/*
ca8d7677
MD
2003 * This function takes a cdev and removes its devfs node in the
2004 * given topology. The cdev remains intact.
21864bc5
MD
2005 */
2006int
2007devfs_destroy_device_node(struct devfs_node *root, cdev_t target)
8312ca30
AH
2008{
2009 KKASSERT(target != NULL);
2010 return devfs_destroy_node(root, target->si_name);
2011}
2012
2013/*
2014 * This function takes a path to a devfs node, resolves it and
2015 * removes the devfs node from the given topology.
2016 */
2017int
2018devfs_destroy_node(struct devfs_node *root, char *target)
21864bc5
MD
2019{
2020 struct devfs_node *node, *parent;
da655383
MD
2021 char *name;
2022 char *name_buf;
21864bc5
MD
2023 char *create_path = NULL;
2024
2025 KKASSERT(target);
2026
da655383 2027 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
8312ca30 2028 ksnprintf(name_buf, PATH_MAX, "%s", target);
21864bc5 2029
8312ca30 2030 devfs_resolve_name_path(target, name_buf, &create_path, &name);
21864bc5
MD
2031
2032 if (create_path)
2033 parent = devfs_resolve_or_create_path(root, create_path, 0);
2034 else
2035 parent = root;
bc185c5a 2036
ab3436e7
MD
2037 if (parent == NULL) {
2038 kfree(name_buf, M_TEMP);
21864bc5 2039 return 1;
ab3436e7 2040 }
bc185c5a 2041
21864bc5 2042 node = devfs_find_device_node_by_name(parent, name);
bc185c5a 2043
07dfa375
AH
2044 if (node) {
2045 nanotime(&node->parent->mtime);
21864bc5 2046 devfs_gc(node);
07dfa375 2047 }
115f9a72 2048
da655383 2049 kfree(name_buf, M_TEMP);
21864bc5
MD
2050
2051 return 0;
2052}
2053
2054/*
2055 * Just set perms and ownership for given node.
2056 */
2057int
bc185c5a
AH
2058devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid,
2059 u_short mode, u_long flags)
21864bc5 2060{
bc185c5a
AH
2061 node->mode = mode;
2062 node->uid = uid;
2063 node->gid = gid;
21864bc5
MD
2064
2065 return 0;
2066}
2067
2068/*
2069 * Propagates a device attach/detach to all mount
2070 * points. Also takes care of automatic alias removal
2071 * for a deleted cdev.
2072 */
2073static int
2074devfs_propagate_dev(cdev_t dev, int attach)
2075{
2076 struct devfs_mnt_data *mnt;
2077
21864bc5 2078 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
21864bc5
MD
2079 if (attach) {
2080 /* Device is being attached */
ca8d7677
MD
2081 devfs_create_device_node(mnt->root_node, dev,
2082 NULL, NULL );
21864bc5
MD
2083 } else {
2084 /* Device is being detached */
21864bc5
MD
2085 devfs_alias_remove(dev);
2086 devfs_destroy_device_node(mnt->root_node, dev);
2087 }
2088 }
21864bc5
MD
2089 return 0;
2090}
2091
21864bc5
MD
2092/*
2093 * devfs_clone either returns a basename from a complete name by
2094 * returning the length of the name without trailing digits, or,
2095 * if clone != 0, calls the device's clone handler to get a new
2096 * device, which in turn is returned in devp.
2097 */
07dfa375
AH
2098cdev_t
2099devfs_clone(cdev_t dev, const char *name, size_t len, int mode,
bc185c5a 2100 struct ucred *cred)
21864bc5 2101{
07dfa375 2102 int error;
21864bc5
MD
2103 struct devfs_clone_handler *chandler;
2104 struct dev_clone_args ap;
2105
d0fe8596 2106 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
07dfa375
AH
2107 if (chandler->namlen != len)
2108 continue;
2109 if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) {
2110 lockmgr(&devfs_lock, LK_RELEASE);
2111 devfs_config();
2112 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2113
2114 ap.a_head.a_dev = dev;
2115 ap.a_dev = NULL;
2116 ap.a_name = name;
2117 ap.a_namelen = len;
2118 ap.a_mode = mode;
2119 ap.a_cred = cred;
2120 error = (chandler->nhandler)(&ap);
2121 if (error)
2122 continue;
21864bc5 2123
07dfa375 2124 return ap.a_dev;
21864bc5
MD
2125 }
2126 }
2127
07dfa375 2128 return NULL;
21864bc5
MD
2129}
2130
2131
2132/*
2133 * Registers a new orphan in the orphan list.
2134 */
2135void
2136devfs_tracer_add_orphan(struct devfs_node *node)
2137{
2138 struct devfs_orphan *orphan;
2139
2140 KKASSERT(node);
2141 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK);
2142 orphan->node = node;
2143
ca8d7677
MD
2144 KKASSERT((node->flags & DEVFS_ORPHANED) == 0);
2145 node->flags |= DEVFS_ORPHANED;
21864bc5
MD
2146 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link);
2147}
2148
2149/*
2150 * Removes an orphan from the orphan list.
2151 */
2152void
2153devfs_tracer_del_orphan(struct devfs_node *node)
2154{
2155 struct devfs_orphan *orphan;
2156
2157 KKASSERT(node);
2158
2159 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) {
2160 if (orphan->node == node) {
ca8d7677 2161 node->flags &= ~DEVFS_ORPHANED;
21864bc5
MD
2162 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link);
2163 kfree(orphan, M_DEVFS);
2164 break;
2165 }
2166 }
2167}
2168
2169/*
2170 * Counts the orphans in the orphan list, and if cleanup
2171 * is specified, also frees the orphan and removes it from
2172 * the list.
2173 */
2174size_t
2175devfs_tracer_orphan_count(struct mount *mp, int cleanup)
2176{
2177 struct devfs_orphan *orphan, *orphan2;
2178 size_t count = 0;
2179
2180 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) {
2181 count++;
bc185c5a
AH
2182 /*
2183 * If we are instructed to clean up, we do so.
2184 */
21864bc5 2185 if (cleanup) {
21864bc5 2186 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link);
ca8d7677
MD
2187 orphan->node->flags &= ~DEVFS_ORPHANED;
2188 devfs_freep(orphan->node);
21864bc5
MD
2189 kfree(orphan, M_DEVFS);
2190 }
2191 }
2192
2193 return count;
2194}
2195
2196/*
2197 * Fetch an ino_t from the global d_ino by increasing it
2198 * while spinlocked.
2199 */
2200static ino_t
2201devfs_fetch_ino(void)
2202{
2203 ino_t ret;
2204
287a8577 2205 spin_lock(&ino_lock);
21864bc5 2206 ret = d_ino++;
287a8577 2207 spin_unlock(&ino_lock);
21864bc5
MD
2208
2209 return ret;
2210}
2211
2212/*
2213 * Allocates a new cdev and initializes it's most basic
2214 * fields.
2215 */
2216cdev_t
8f960aa9 2217devfs_new_cdev(struct dev_ops *ops, int minor, struct dev_ops *bops)
21864bc5 2218{
21864bc5 2219 cdev_t dev = sysref_alloc(&cdev_sysref_class);
da655383 2220
21864bc5
MD
2221 sysref_activate(&dev->si_sysref);
2222 reference_dev(dev);
da655383 2223 bzero(dev, offsetof(struct cdev, si_sysref));
21864bc5
MD
2224
2225 dev->si_uid = 0;
2226 dev->si_gid = 0;
2227 dev->si_perms = 0;
2228 dev->si_drv1 = NULL;
2229 dev->si_drv2 = NULL;
2230 dev->si_lastread = 0; /* time_second */
2231 dev->si_lastwrite = 0; /* time_second */
2232
f5d8307c 2233 dev->si_dict = NULL;
72ea429e 2234 dev->si_parent = NULL;
21864bc5 2235 dev->si_ops = ops;
894bbb25 2236 dev->si_flags = 0;
d9f8f778 2237 dev->si_umajor = 0;
21864bc5 2238 dev->si_uminor = minor;
8f960aa9 2239 dev->si_bops = bops;
bf390b25
AH
2240
2241 /*
2242 * Since the disk subsystem is in the way, we need to
2243 * propagate the D_CANFREE from bops (and ops) to
2244 * si_flags.
2245 */
2246 if (bops && (bops->head.flags & D_CANFREE)) {
2247 dev->si_flags |= SI_CANFREE;
2248 } else if (ops->head.flags & D_CANFREE) {
2249 dev->si_flags |= SI_CANFREE;
2250 }
2251
47ae500f 2252 /* If there is a backing device, we reference its ops */
d9f8f778
SW
2253 dev->si_inode = makeudev(
2254 devfs_reference_ops((bops)?(bops):(ops)),
2255 minor );
21864bc5
MD
2256
2257 return dev;
2258}
2259
ca8d7677
MD
2260static void
2261devfs_cdev_terminate(cdev_t dev)
21864bc5
MD
2262{
2263 int locked = 0;
2264
2265 /* Check if it is locked already. if not, we acquire the devfs lock */
2266 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
2267 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2268 locked = 1;
2269 }
2270
e4ff5ef9
AH
2271 /*
2272 * Make sure the node isn't linked anymore. Otherwise we've screwed
2273 * up somewhere, since normal devs are unlinked on the call to
2274 * destroy_dev and only-cdevs that have not been used for cloning
2275 * are not linked in the first place. only-cdevs used for cloning
2276 * will be linked in, too, and should only be destroyed via
2277 * destroy_dev, not destroy_only_dev, so we catch that problem, too.
2278 */
2279 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
21864bc5
MD
2280
2281 /* If we acquired the lock, we also get rid of it */
2282 if (locked)
2283 lockmgr(&devfs_lock, LK_RELEASE);
2284
47ae500f 2285 /* If there is a backing device, we release the backing device's ops */
8f960aa9 2286 devfs_release_ops((dev->si_bops)?(dev->si_bops):(dev->si_ops));
7cbab9da 2287
21864bc5
MD
2288 /* Finally destroy the device */
2289 sysref_put(&dev->si_sysref);
2290}
2291
e654922c
MD
2292/*
2293 * Dummies for now (individual locks for MPSAFE)
2294 */
2295static void
2296devfs_cdev_lock(cdev_t dev)
2297{
2298}
2299
2300static void
2301devfs_cdev_unlock(cdev_t dev)
2302{
2303}
2304
3bd9e88a
SG
2305static int
2306devfs_detached_filter_eof(struct knote *kn, long hint)
2307{
3bcb6e5e 2308 kn->kn_flags |= (EV_EOF | EV_NODATA);
3bd9e88a
SG
2309 return (1);
2310}
2311
2312static void
2313devfs_detached_filter_detach(struct knote *kn)
2314{
2315 cdev_t dev = (cdev_t)kn->kn_hook;
2316
2317 knote_remove(&dev->si_kqinfo.ki_note, kn);
2318}
2319
2320static struct filterops devfs_detached_filterops =
2321 { FILTEROP_ISFD, NULL,
2322 devfs_detached_filter_detach,
2323 devfs_detached_filter_eof };
2324
2325/*
2326 * Delegates knote filter handling responsibility to devfs
2327 *
2328 * Any device that implements kqfilter event handling and could be detached
2329 * or shut down out from under the kevent subsystem must allow devfs to
2330 * assume responsibility for any knotes it may hold.
2331 */
2332void
2333devfs_assume_knotes(cdev_t dev, struct kqinfo *kqi)
2334{
377c3461
MD
2335 /*
2336 * Let kern/kern_event.c do the heavy lifting.
2337 */
2338 knote_assume_knotes(kqi, &dev->si_kqinfo,
2339 &devfs_detached_filterops, (void *)dev);
3bd9e88a
SG
2340
2341 /*
2342 * These should probably be activated individually, but doing so
2343 * would require refactoring kq's public in-kernel interface.
2344 */
2345 KNOTE(&dev->si_kqinfo.ki_note, 0);
3bd9e88a
SG
2346}
2347
21864bc5
MD
2348/*
2349 * Links a given cdev into the dev list.
2350 */
2351int
2352devfs_link_dev(cdev_t dev)
2353{
ca8d7677 2354 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
21864bc5
MD
2355 dev->si_flags |= SI_DEVFS_LINKED;
2356 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link);
2357
2358 return 0;
2359}
2360
2361/*
ca8d7677
MD
2362 * Removes a given cdev from the dev list. The caller is responsible for
2363 * releasing the reference on the device associated with the linkage.
2364 *
2365 * Returns EALREADY if the dev has already been unlinked.
21864bc5 2366 */
ca8d7677 2367static int
21864bc5
MD
2368devfs_unlink_dev(cdev_t dev)
2369{
2370 if ((dev->si_flags & SI_DEVFS_LINKED)) {
2371 TAILQ_REMOVE(&devfs_dev_list, dev, link);
2372 dev->si_flags &= ~SI_DEVFS_LINKED;
ca8d7677 2373 return (0);
21864bc5 2374 }
ca8d7677 2375 return (EALREADY);
21864bc5
MD
2376}
2377
894bbb25
AH
2378int
2379devfs_node_is_accessible(struct devfs_node *node)
2380{
2381 if ((node) && (!(node->flags & DEVFS_HIDDEN)))
2382 return 1;
2383 else
2384 return 0;
2385}
2386
7cbab9da
AH
2387int
2388devfs_reference_ops(struct dev_ops *ops)
2389{
2390 int unit;
176de024
AH
2391 struct devfs_dev_ops *found = NULL;
2392 struct devfs_dev_ops *devops;
7cbab9da 2393
176de024
AH
2394 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2395 if (devops->ops == ops) {
2396 found = devops;
2397 break;
2398 }
2399 }
2400
2401 if (!found) {
2402 found = kmalloc(sizeof(struct devfs_dev_ops), M_DEVFS, M_WAITOK);
2403 found->ops = ops;
2404 found->ref_count = 0;
2405 TAILQ_INSERT_TAIL(&devfs_dev_ops_list, found, link);
2406 }
2407
2408 KKASSERT(found);
2409
2410 if (found->ref_count == 0) {
2411 found->id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255);
2412 if (found->id == -1) {
7cbab9da 2413 /* Ran out of unique ids */
bc185c5a
AH
2414 devfs_debug(DEVFS_DEBUG_WARNING,
2415 "devfs_reference_ops: WARNING: ran out of unique ids\n");
7cbab9da
AH
2416 }
2417 }
176de024
AH
2418 unit = found->id;
2419 ++found->ref_count;
7cbab9da
AH
2420
2421 return unit;
2422}
2423
2424void
2425devfs_release_ops(struct dev_ops *ops)
2426{
176de024
AH
2427 struct devfs_dev_ops *found = NULL;
2428 struct devfs_dev_ops *devops;
2429
2430 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2431 if (devops->ops == ops) {
2432 found = devops;
2433 break;
2434 }
2435 }
2436
2437 KKASSERT(found);
2438
2439 --found->ref_count;
7cbab9da 2440
176de024
AH
2441 if (found->ref_count == 0) {
2442 TAILQ_REMOVE(&devfs_dev_ops_list, found, link);
2443 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), found->id);
2444 kfree(found, M_DEVFS);
7cbab9da
AH
2445 }
2446}
2447
a4141af4
MD
2448/*
2449 * Wait for asynchronous messages to complete in the devfs helper
2450 * thread, then return. Do nothing if the helper thread is dead
1c375cd1 2451 * or we are being indirectly called from the helper thread itself.
a4141af4 2452 */
21864bc5 2453void
d0fe8596 2454devfs_config(void)
21864bc5
MD
2455{
2456 devfs_msg_t msg;
2457
1c375cd1 2458 if (devfs_run && curthread != td_core) {
a4141af4
MD
2459 msg = devfs_msg_get();
2460 msg = devfs_msg_send_sync(DEVFS_SYNC, msg);
2461 devfs_msg_put(msg);
2462 }
21864bc5
MD
2463}
2464
2465/*
2466 * Called on init of devfs; creates the objcaches and
2467 * spawns off the devfs core thread. Also initializes
2468 * locks.
2469 */
2470static void
2471devfs_init(void)
2472{
2473 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n");
2474 /* Create objcaches for nodes, msgs and devs */
d0fe8596
MD
2475 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0,
2476 NULL, NULL, NULL,
2477 objcache_malloc_alloc,
2478 objcache_malloc_free,
2479 &devfs_node_malloc_args );
2480
2481 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0,
2482 NULL, NULL, NULL,
2483 objcache_malloc_alloc,
2484 objcache_malloc_free,
2485 &devfs_msg_malloc_args );
2486
2487 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0,
2488 NULL, NULL, NULL,
2489 objcache_malloc_alloc,
2490 objcache_malloc_free,
2491 &devfs_dev_malloc_args );
21864bc5 2492
7cbab9da 2493 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id));
7cbab9da 2494
21864bc5
MD
2495 /* Initialize the reply-only port which acts as a message drain */
2496 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply);
2497
2498 /* Initialize *THE* devfs lock */
2499 lockinit(&devfs_lock, "devfs_core lock", 0, 0);
2500
c9e9fb21 2501 lockmgr(&devfs_lock, LK_EXCLUSIVE);
21864bc5 2502 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL,
fdce8919 2503 0, 0, "devfs_msg_core");
1c375cd1 2504 while (devfs_run == 0)
c9e9fb21
MD
2505 lksleep(td_core, &devfs_lock, 0, "devfsc", 0);
2506 lockmgr(&devfs_lock, LK_RELEASE);
21864bc5
MD
2507
2508 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n");
2509}
2510
2511/*
2512 * Called on unload of devfs; takes care of destroying the core
2513 * and the objcaches. Also removes aliases that are no longer needed.
2514 */
2515static void
2516devfs_uninit(void)
2517{
2518 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
2519
2520 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL);
1c375cd1
MD
2521 while (devfs_run)
2522 tsleep(td_core, 0, "devfsc", hz*10);
2523 tsleep(td_core, 0, "devfsc", hz);
21864bc5 2524
7cbab9da
AH
2525 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id));
2526
21864bc5
MD
2527 /* Destroy the objcaches */
2528 objcache_destroy(devfs_msg_cache);
2529 objcache_destroy(devfs_node_cache);
2530 objcache_destroy(devfs_dev_cache);
2531
2532 devfs_alias_reap();
2533}
2534
2535/*
2536 * This is a sysctl handler to assist userland devname(3) to
2537 * find the device name for a given udev.
2538 */
2539static int
2540devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS)
2541{
2542 udev_t udev;
2543 cdev_t found;
2544 int error;
2545
2546
2547 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t))))
2548 return (error);
2549
2550 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev);
2551
2552 if (udev == NOUDEV)
2553 return(EINVAL);
2554
2555 if ((found = devfs_find_device_by_udev(udev)) == NULL)
2556 return(ENOENT);
2557
2558 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1));
2559}
2560
2561
2562SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
2563 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)");
2564
3a1032a6 2565SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
21864bc5 2566TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable);
bc185c5a
AH
2567SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable,
2568 0, "Enable DevFS debugging");
21864bc5 2569
bc185c5a
AH
2570SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST,
2571 devfs_init, NULL);
2572SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY,
2573 devfs_uninit, NULL);
8312ca30
AH
2574
2575/*
2576 * WildCmp() - compare wild string to sane string
2577 *
2578 * Returns 0 on success, -1 on failure.
2579 */
2580static int
2581wildCmp(const char **mary, int d, const char *w, const char *s)
2582{
2583 int i;
2584
2585 /*
2586 * skip fixed portion
2587 */
2588 for (;;) {
2589 switch(*w) {
2590 case '*':
2591 /*
2592 * optimize terminator
2593 */
2594 if (w[1] == 0)
2595 return(0);
2596 if (w[1] != '?' && w[1] != '*') {
2597 /*
2598 * optimize * followed by non-wild
2599 */
2600 for (i = 0; s + i < mary[d]; ++i) {
2601 if (s[i] == w[1] && wildCmp(mary, d + 1, w + 1, s + i) == 0)
2602 return(0);
2603 }
2604 } else {
2605 /*
2606 * less-optimal
2607 */
2608 for (i = 0; s + i < mary[d]; ++i) {
2609 if (wildCmp(mary, d + 1, w + 1, s + i) == 0)
2610 return(0);
2611 }
2612 }
2613 mary[d] = s;
2614 return(-1);
2615 case '?':
2616 if (*s == 0)
2617 return(-1);
2618 ++w;
2619 ++s;
2620 break;
2621 default:
2622 if (*w != *s)
2623 return(-1);
2624 if (*w == 0) /* terminator */
2625 return(0);
2626 ++w;
2627 ++s;
2628 break;
2629 }
2630 }
2631 /* not reached */
2632 return(-1);
2633}
2634
2635
2636/*
2637 * WildCaseCmp() - compare wild string to sane string, case insensitive
2638 *
2639 * Returns 0 on success, -1 on failure.
2640 */
2641static int
2642wildCaseCmp(const char **mary, int d, const char *w, const char *s)
2643{
2644 int i;
2645
2646 /*
2647 * skip fixed portion
2648 */
2649 for (;;) {
2650 switch(*w) {
2651 case '*':
2652 /*
2653 * optimize terminator
2654 */
2655 if (w[1] == 0)
2656 return(0);
2657 if (w[1] != '?' && w[1] != '*') {
2658 /*
2659 * optimize * followed by non-wild
2660 */
2661 for (i = 0; s + i < mary[d]; ++i) {
2662 if (s[i] == w[1] && wildCaseCmp(mary, d + 1, w + 1, s + i) == 0)
2663 return(0);
2664 }
2665 } else {
2666 /*
2667 * less-optimal
2668 */
2669 for (i = 0; s + i < mary[d]; ++i) {
2670 if (wildCaseCmp(mary, d + 1, w + 1, s + i) == 0)
2671 return(0);
2672 }
2673 }
2674 mary[d] = s;
2675 return(-1);
2676 case '?':
2677 if (*s == 0)
2678 return(-1);
2679 ++w;
2680 ++s;
2681 break;
2682 default:
2683 if (*w != *s) {
2684#define tolower(x) ((x >= 'A' && x <= 'Z')?(x+('a'-'A')):(x))
2685 if (tolower(*w) != tolower(*s))
2686 return(-1);
2687 }
2688 if (*w == 0) /* terminator */
2689 return(0);
2690 ++w;
2691 ++s;
2692 break;
2693 }
2694 }
2695 /* not reached */
2696 return(-1);
2697}
2698
2699int
2700devfs_WildCmp(const char *w, const char *s)
2701{
2702 int i;
2703 int c;
2704 int slen = strlen(s);
2705 const char **mary;
2706
2707 for (i = c = 0; w[i]; ++i) {
2708 if (w[i] == '*')
2709 ++c;
2710 }
2711 mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK);
2712 for (i = 0; i < c; ++i)
2713 mary[i] = s + slen;
2714 i = wildCmp(mary, 0, w, s);
2715 kfree(mary, M_DEVFS);
2716 return(i);
2717}
2718
2719int
2720devfs_WildCaseCmp(const char *w, const char *s)
2721{
2722 int i;
2723 int c;
2724 int slen = strlen(s);
2725 const char **mary;
2726
2727 for (i = c = 0; w[i]; ++i) {
2728 if (w[i] == '*')
2729 ++c;
2730 }
2731 mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK);
2732 for (i = 0; i < c; ++i)
2733 mary[i] = s + slen;
2734 i = wildCaseCmp(mary, 0, w, s);
2735 kfree(mary, M_DEVFS);
2736 return(i);
2737}
2738