Commit | Line | Data |
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21864bc5 MD |
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> | |
21864bc5 MD |
42 | #include <sys/sysctl.h> |
43 | #include <sys/ucred.h> | |
44 | #include <sys/param.h> | |
7cbab9da | 45 | #include <sys/systm.h> |
2c1e28dd AH |
46 | #include <sys/devfs.h> |
47 | #include <sys/devfs_rules.h> | |
3a3826b3 | 48 | #include <sys/udev.h> |
21864bc5 | 49 | |
c9e9fb21 MD |
50 | #include <sys/msgport2.h> |
51 | #include <sys/spinlock2.h> | |
52 | #include <sys/mplock2.h> | |
53 | #include <sys/sysref2.h> | |
54 | ||
21864bc5 | 55 | MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations"); |
7cbab9da | 56 | DEVFS_DECLARE_CLONE_BITMAP(ops_id); |
21864bc5 MD |
57 | /* |
58 | * SYSREF Integration - reference counting, allocation, | |
59 | * sysid and syslink integration. | |
60 | */ | |
61 | static void devfs_cdev_terminate(cdev_t dev); | |
e654922c MD |
62 | static void devfs_cdev_lock(cdev_t dev); |
63 | static void devfs_cdev_unlock(cdev_t dev); | |
21864bc5 MD |
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), | |
521f81c7 | 70 | .nom_cache = 32, |
21864bc5 MD |
71 | .flags = 0, |
72 | .ops = { | |
e654922c MD |
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 | |
21864bc5 MD |
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 | ||
bc185c5a AH |
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); | |
176de024 AH |
98 | static struct devfs_dev_ops_head devfs_dev_ops_list = |
99 | TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list); | |
21864bc5 MD |
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; | |
21864bc5 | 105 | |
21864bc5 | 106 | static struct spinlock ino_lock; |
d0fe8596 MD |
107 | static ino_t d_ino; |
108 | static int devfs_debug_enable; | |
109 | static int devfs_run; | |
21864bc5 MD |
110 | |
111 | static ino_t devfs_fetch_ino(void); | |
21864bc5 MD |
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); | |
72ea429e | 115 | static int devfs_destroy_related_worker(cdev_t); |
21864bc5 MD |
116 | static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int); |
117 | static int devfs_propagate_dev(cdev_t, int); | |
ca8d7677 | 118 | static int devfs_unlink_dev(cdev_t dev); |
d0fe8596 | 119 | static void devfs_msg_exec(devfs_msg_t msg); |
21864bc5 | 120 | |
07dfa375 AH |
121 | static int devfs_chandler_add_worker(const char *, d_clone_t *); |
122 | static int devfs_chandler_del_worker(const char *); | |
21864bc5 MD |
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); | |
21864bc5 | 131 | |
3a3826b3 | 132 | static int devfs_scan_callback_worker(devfs_scan_t *, void *); |
21864bc5 | 133 | |
bc185c5a AH |
134 | static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *, |
135 | char *, size_t, int); | |
21864bc5 MD |
136 | |
137 | static int devfs_make_alias_worker(struct devfs_alias *); | |
8312ca30 | 138 | static int devfs_destroy_alias_worker(struct devfs_alias *); |
21864bc5 MD |
139 | static int devfs_alias_remove(cdev_t); |
140 | static int devfs_alias_reap(void); | |
8312ca30 | 141 | static int devfs_alias_propagate(struct devfs_alias *, int); |
21864bc5 MD |
142 | static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *); |
143 | static int devfs_alias_check_create(struct devfs_node *); | |
144 | ||
72ea429e AH |
145 | static int devfs_clr_related_flag_worker(cdev_t, uint32_t); |
146 | static int devfs_destroy_related_without_flag_worker(cdev_t, uint32_t); | |
ca8d7677 | 147 | |
66abefa5 AH |
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 | ||
21864bc5 | 154 | /* |
bc185c5a AH |
155 | * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function |
156 | * using kvprintf | |
21864bc5 MD |
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 | /* | |
ca8d7677 MD |
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 | |
21864bc5 MD |
176 | */ |
177 | struct devfs_node * | |
ca8d7677 MD |
178 | devfs_allocp(devfs_nodetype devfsnodetype, char *name, |
179 | struct devfs_node *parent, struct mount *mp, cdev_t dev) | |
21864bc5 MD |
180 | { |
181 | struct devfs_node *node = NULL; | |
182 | size_t namlen = strlen(name); | |
21864bc5 MD |
183 | |
184 | node = objcache_get(devfs_node_cache, M_WAITOK); | |
ca8d7677 MD |
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; |
21864bc5 MD |
190 | node->nchildren = 1; |
191 | node->mp = mp; | |
192 | node->d_dir.d_ino = devfs_fetch_ino(); | |
21864bc5 | 193 | |
bc185c5a AH |
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 | |
21864bc5 | 207 | switch (devfsnodetype) { |
8e78a293 | 208 | case Nroot: |
bc185c5a AH |
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; |
8e78a293 | 214 | case Ndir: |
21864bc5 MD |
215 | TAILQ_INIT(DEVFS_DENODE_HEAD(node)); |
216 | node->d_dir.d_type = DT_DIR; | |
217 | node->nchildren = 2; | |
218 | break; | |
219 | ||
8e78a293 | 220 | case Nlink: |
21864bc5 MD |
221 | node->d_dir.d_type = DT_LNK; |
222 | break; | |
223 | ||
8e78a293 | 224 | case Nreg: |
21864bc5 MD |
225 | node->d_dir.d_type = DT_REG; |
226 | break; | |
227 | ||
8e78a293 | 228 | case Ndev: |
21864bc5 MD |
229 | if (dev != NULL) { |
230 | node->d_dir.d_type = DT_CHR; | |
231 | node->d_dev = dev; | |
21864bc5 | 232 | |
bc185c5a AH |
233 | node->mode = dev->si_perms; |
234 | node->uid = dev->si_uid; | |
235 | node->gid = dev->si_gid; | |
21864bc5 MD |
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); |
21864bc5 MD |
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 */ |
ca8d7677 MD |
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) && |
8e78a293 | 266 | ((parent->node_type == Nroot) || (parent->node_type == Ndir))) { |
21864bc5 MD |
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 | |
ca8d7677 MD |
272 | /* This forces negative namecache lookups to clear */ |
273 | ++mp->mnt_namecache_gen; | |
274 | } | |
21864bc5 | 275 | |
951cde04 AH |
276 | /* Apply rules */ |
277 | devfs_rule_check_apply(node, NULL); | |
278 | ||
d4f19b8b | 279 | atomic_add_long(&DEVFS_MNTDATA(mp)->file_count, 1); |
aee6fa68 | 280 | |
21864bc5 MD |
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 | ||
21864bc5 MD |
295 | try_again: |
296 | while ((vp = node->v_node) != NULL) { | |
297 | error = vget(vp, LK_EXCLUSIVE); | |
495d3a1e | 298 | if (error == 0) { |
21864bc5 | 299 | *vpp = vp; |
21864bc5 MD |
300 | goto out; |
301 | } | |
495d3a1e MD |
302 | if (error != ENOENT) { |
303 | *vpp = NULL; | |
304 | goto out; | |
305 | } | |
21864bc5 | 306 | } |
21864bc5 | 307 | |
21864bc5 MD |
308 | if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0) |
309 | goto out; | |
310 | ||
311 | vp = *vpp; | |
312 | ||
21864bc5 MD |
313 | if (node->v_node != NULL) { |
314 | vp->v_type = VBAD; | |
315 | vx_put(vp); | |
316 | goto try_again; | |
317 | } | |
318 | ||
319 | vp->v_data = node; | |
320 | node->v_node = vp; | |
21864bc5 MD |
321 | |
322 | switch (node->node_type) { | |
8e78a293 | 323 | case Nroot: |
2247fe02 MD |
324 | vsetflags(vp, VROOT); |
325 | /* fall through */ | |
8e78a293 | 326 | case Ndir: |
21864bc5 MD |
327 | vp->v_type = VDIR; |
328 | break; | |
329 | ||
8e78a293 | 330 | case Nlink: |
21864bc5 MD |
331 | vp->v_type = VLNK; |
332 | break; | |
333 | ||
8e78a293 | 334 | case Nreg: |
21864bc5 MD |
335 | vp->v_type = VREG; |
336 | break; | |
337 | ||
8e78a293 | 338 | case Ndev: |
21864bc5 | 339 | vp->v_type = VCHR; |
21864bc5 MD |
340 | KKASSERT(node->d_dev); |
341 | ||
bc185c5a | 342 | vp->v_uminor = node->d_dev->si_uminor; |
619e8f47 | 343 | vp->v_umajor = node->d_dev->si_umajor; |
bc185c5a AH |
344 | |
345 | v_associate_rdev(vp, node->d_dev); | |
346 | vp->v_ops = &node->mp->mnt_vn_spec_ops; | |
21864bc5 MD |
347 | break; |
348 | ||
349 | default: | |
350 | panic("devfs_allocv: unknown node type"); | |
351 | } | |
352 | ||
353 | out: | |
21864bc5 MD |
354 | return error; |
355 | } | |
356 | ||
357 | /* | |
358 | * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode | |
359 | * based on the newly created devfs node. | |
360 | */ | |
361 | int | |
362 | devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype, | |
bc185c5a | 363 | char *name, struct devfs_node *parent, cdev_t dev) |
21864bc5 MD |
364 | { |
365 | struct devfs_node *node; | |
366 | ||
21864bc5 | 367 | node = devfs_allocp(devfsnodetype, name, parent, mp, dev); |
bc185c5a | 368 | |
21864bc5 MD |
369 | if (node != NULL) |
370 | devfs_allocv(vpp, node); | |
371 | else | |
372 | *vpp = NULL; | |
373 | ||
21864bc5 MD |
374 | return 0; |
375 | } | |
376 | ||
377 | /* | |
ca8d7677 MD |
378 | * Destroy the devfs_node. The node must be unlinked from the topology. |
379 | * | |
380 | * This function will also destroy any vnode association with the node | |
381 | * and device. | |
382 | * | |
383 | * The cdev_t itself remains intact. | |
d4f19b8b MD |
384 | * |
385 | * The core lock is not necessarily held on call and must be temporarily | |
386 | * released if it is to avoid a deadlock. | |
21864bc5 MD |
387 | */ |
388 | int | |
389 | devfs_freep(struct devfs_node *node) | |
390 | { | |
ca8d7677 | 391 | struct vnode *vp; |
d4f19b8b | 392 | int relock; |
ca8d7677 | 393 | |
21864bc5 | 394 | KKASSERT(node); |
ca8d7677 | 395 | KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) || |
8e78a293 | 396 | (node->node_type == Nroot)); |
21864bc5 | 397 | |
ca8d7677 | 398 | /* |
a4141af4 | 399 | * Protect against double frees |
ca8d7677 | 400 | */ |
a4141af4 MD |
401 | KKASSERT((node->flags & DEVFS_DESTROYED) == 0); |
402 | node->flags |= DEVFS_DESTROYED; | |
21864bc5 | 403 | |
ca8d7677 | 404 | /* |
a4141af4 MD |
405 | * Avoid deadlocks between devfs_lock and the vnode lock when |
406 | * disassociating the vnode (stress2 pty vs ls -la /dev/pts). | |
e23485a5 | 407 | * |
a4141af4 MD |
408 | * This also prevents the vnode reclaim code from double-freeing |
409 | * the node. The vget() is required to safely modified the vp | |
410 | * and cycle the refs to terminate an inactive vp. | |
ca8d7677 | 411 | */ |
d4f19b8b MD |
412 | if (lockstatus(&devfs_lock, curthread) == LK_EXCLUSIVE) { |
413 | lockmgr(&devfs_lock, LK_RELEASE); | |
414 | relock = 1; | |
415 | } else { | |
416 | relock = 0; | |
417 | } | |
a4141af4 | 418 | |
e23485a5 MD |
419 | while ((vp = node->v_node) != NULL) { |
420 | if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0) | |
421 | break; | |
9b823501 | 422 | v_release_rdev(vp); |
ca8d7677 MD |
423 | vp->v_data = NULL; |
424 | node->v_node = NULL; | |
71f27d2d | 425 | cache_inval_vp(vp, CINV_DESTROY); |
e23485a5 | 426 | vput(vp); |
ca8d7677 | 427 | } |
a4141af4 MD |
428 | |
429 | /* | |
430 | * Remaining cleanup | |
431 | */ | |
d4f19b8b | 432 | atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->leak_count, 1); |
a4141af4 MD |
433 | if (node->symlink_name) { |
434 | kfree(node->symlink_name, M_DEVFS); | |
435 | node->symlink_name = NULL; | |
436 | } | |
437 | ||
438 | /* | |
439 | * Remove the node from the orphan list if it is still on it. | |
440 | */ | |
441 | if (node->flags & DEVFS_ORPHANED) | |
442 | devfs_tracer_del_orphan(node); | |
443 | ||
4062d050 | 444 | if (node->d_dir.d_name) { |
ca8d7677 | 445 | kfree(node->d_dir.d_name, M_DEVFS); |
4062d050 MD |
446 | node->d_dir.d_name = NULL; |
447 | } | |
d4f19b8b | 448 | atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->file_count, 1); |
21864bc5 MD |
449 | objcache_put(devfs_node_cache, node); |
450 | ||
d4f19b8b MD |
451 | if (relock) |
452 | lockmgr(&devfs_lock, LK_EXCLUSIVE); | |
453 | ||
21864bc5 MD |
454 | return 0; |
455 | } | |
456 | ||
457 | /* | |
ca8d7677 MD |
458 | * Unlink the devfs node from the topology and add it to the orphan list. |
459 | * The node will later be destroyed by freep. | |
460 | * | |
461 | * Any vnode association, including the v_rdev and v_data, remains intact | |
462 | * until the freep. | |
21864bc5 MD |
463 | */ |
464 | int | |
465 | devfs_unlinkp(struct devfs_node *node) | |
466 | { | |
467 | struct devfs_node *parent; | |
468 | KKASSERT(node); | |
469 | ||
bc185c5a AH |
470 | /* |
471 | * Add the node to the orphan list, so it is referenced somewhere, to | |
472 | * so we don't leak it. | |
473 | */ | |
21864bc5 | 474 | devfs_tracer_add_orphan(node); |
bc185c5a | 475 | |
21864bc5 MD |
476 | parent = node->parent; |
477 | ||
ca8d7677 MD |
478 | /* |
479 | * If the parent is known we can unlink the node out of the topology | |
480 | */ | |
21864bc5 MD |
481 | if (parent) { |
482 | TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link); | |
483 | parent->nchildren--; | |
21864bc5 MD |
484 | node->flags &= ~DEVFS_NODE_LINKED; |
485 | } | |
8312ca30 | 486 | |
21864bc5 | 487 | node->parent = NULL; |
21864bc5 MD |
488 | return 0; |
489 | } | |
490 | ||
66abefa5 AH |
491 | void * |
492 | devfs_iterate_topology(struct devfs_node *node, | |
493 | devfs_iterate_callback_t *callback, void *arg1) | |
21864bc5 MD |
494 | { |
495 | struct devfs_node *node1, *node2; | |
66abefa5 | 496 | void *ret = NULL; |
21864bc5 | 497 | |
8e78a293 | 498 | if ((node->node_type == Nroot) || (node->node_type == Ndir)) { |
21864bc5 | 499 | if (node->nchildren > 2) { |
ca8d7677 | 500 | TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), |
bc185c5a | 501 | link, node2) { |
66abefa5 AH |
502 | if ((ret = devfs_iterate_topology(node1, callback, arg1))) |
503 | return ret; | |
21864bc5 MD |
504 | } |
505 | } | |
506 | } | |
21864bc5 | 507 | |
66abefa5 AH |
508 | ret = callback(node, arg1); |
509 | return ret; | |
21864bc5 MD |
510 | } |
511 | ||
512 | /* | |
66abefa5 AH |
513 | * devfs_reaperp() is a recursive function that iterates through all the |
514 | * topology, unlinking and freeing all devfs nodes. | |
21864bc5 | 515 | */ |
66abefa5 AH |
516 | static void * |
517 | devfs_reaperp_callback(struct devfs_node *node, void *unused) | |
21864bc5 | 518 | { |
21864bc5 | 519 | devfs_unlinkp(node); |
21864bc5 MD |
520 | devfs_freep(node); |
521 | ||
66abefa5 | 522 | return NULL; |
21864bc5 MD |
523 | } |
524 | ||
66abefa5 AH |
525 | static void * |
526 | devfs_gc_dirs_callback(struct devfs_node *node, void *unused) | |
21864bc5 | 527 | { |
8e78a293 | 528 | if (node->node_type == Ndir) { |
39a08947 AH |
529 | if ((node->nchildren == 2) && |
530 | !(node->flags & DEVFS_USER_CREATED)) { | |
21864bc5 MD |
531 | devfs_unlinkp(node); |
532 | devfs_freep(node); | |
533 | } | |
534 | } | |
535 | ||
66abefa5 AH |
536 | return NULL; |
537 | } | |
538 | ||
539 | static void * | |
540 | devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target) | |
541 | { | |
8e78a293 | 542 | if ((node->node_type == Nlink) && (node->link_target == target)) { |
66abefa5 AH |
543 | devfs_unlinkp(node); |
544 | devfs_freep(node); | |
545 | } | |
546 | ||
547 | return NULL; | |
21864bc5 MD |
548 | } |
549 | ||
550 | /* | |
66abefa5 AH |
551 | * devfs_gc() is devfs garbage collector. It takes care of unlinking and |
552 | * freeing a node, but also removes empty directories and links that link | |
553 | * via devfs auto-link mechanism to the node being deleted. | |
21864bc5 | 554 | */ |
66abefa5 AH |
555 | int |
556 | devfs_gc(struct devfs_node *node) | |
21864bc5 | 557 | { |
66abefa5 | 558 | struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node; |
21864bc5 | 559 | |
66abefa5 AH |
560 | if (node->nlinks > 0) |
561 | devfs_iterate_topology(root_node, | |
562 | (devfs_iterate_callback_t *)devfs_gc_links_callback, node); | |
21864bc5 | 563 | |
66abefa5 AH |
564 | devfs_unlinkp(node); |
565 | devfs_iterate_topology(root_node, | |
566 | (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL); | |
567 | ||
568 | devfs_freep(node); | |
21864bc5 | 569 | |
66abefa5 | 570 | return 0; |
21864bc5 MD |
571 | } |
572 | ||
573 | /* | |
ca8d7677 MD |
574 | * devfs_create_dev() is the asynchronous entry point for device creation. |
575 | * It just sends a message with the relevant details to the devfs core. | |
576 | * | |
577 | * This function will reference the passed device. The reference is owned | |
578 | * by devfs and represents all of the device's node associations. | |
21864bc5 MD |
579 | */ |
580 | int | |
581 | devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms) | |
582 | { | |
ca8d7677 | 583 | reference_dev(dev); |
bc185c5a AH |
584 | devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms); |
585 | ||
21864bc5 MD |
586 | return 0; |
587 | } | |
588 | ||
589 | /* | |
ca8d7677 MD |
590 | * devfs_destroy_dev() is the asynchronous entry point for device destruction. |
591 | * It just sends a message with the relevant details to the devfs core. | |
21864bc5 MD |
592 | */ |
593 | int | |
594 | devfs_destroy_dev(cdev_t dev) | |
595 | { | |
596 | devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0); | |
597 | return 0; | |
598 | } | |
599 | ||
600 | /* | |
ca8d7677 MD |
601 | * devfs_mount_add() is the synchronous entry point for adding a new devfs |
602 | * mount. It sends a synchronous message with the relevant details to the | |
603 | * devfs core. | |
21864bc5 MD |
604 | */ |
605 | int | |
606 | devfs_mount_add(struct devfs_mnt_data *mnt) | |
607 | { | |
608 | devfs_msg_t msg; | |
609 | ||
610 | msg = devfs_msg_get(); | |
ca8d7677 | 611 | msg->mdv_mnt = mnt; |
21864bc5 MD |
612 | msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg); |
613 | devfs_msg_put(msg); | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
618 | /* | |
619 | * devfs_mount_del() is the synchronous entry point for removing a devfs mount. | |
620 | * It sends a synchronous message with the relevant details to the devfs core. | |
621 | */ | |
622 | int | |
623 | devfs_mount_del(struct devfs_mnt_data *mnt) | |
624 | { | |
625 | devfs_msg_t msg; | |
626 | ||
627 | msg = devfs_msg_get(); | |
ca8d7677 | 628 | msg->mdv_mnt = mnt; |
21864bc5 MD |
629 | msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg); |
630 | devfs_msg_put(msg); | |
631 | ||
632 | return 0; | |
633 | } | |
634 | ||
635 | /* | |
72ea429e | 636 | * devfs_destroy_related() is the synchronous entry point for device |
bc185c5a AH |
637 | * destruction by subname. It just sends a message with the relevant details to |
638 | * the devfs core. | |
21864bc5 MD |
639 | */ |
640 | int | |
72ea429e | 641 | devfs_destroy_related(cdev_t dev) |
21864bc5 | 642 | { |
ca8d7677 MD |
643 | devfs_msg_t msg; |
644 | ||
645 | msg = devfs_msg_get(); | |
72ea429e AH |
646 | msg->mdv_load = dev; |
647 | msg = devfs_msg_send_sync(DEVFS_DESTROY_RELATED, msg); | |
ca8d7677 MD |
648 | devfs_msg_put(msg); |
649 | return 0; | |
650 | } | |
651 | ||
652 | int | |
72ea429e | 653 | devfs_clr_related_flag(cdev_t dev, uint32_t flag) |
ca8d7677 MD |
654 | { |
655 | devfs_msg_t msg; | |
656 | ||
657 | msg = devfs_msg_get(); | |
72ea429e | 658 | msg->mdv_flags.dev = dev; |
ca8d7677 | 659 | msg->mdv_flags.flag = flag; |
72ea429e | 660 | msg = devfs_msg_send_sync(DEVFS_CLR_RELATED_FLAG, msg); |
ca8d7677 MD |
661 | devfs_msg_put(msg); |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
666 | int | |
72ea429e | 667 | devfs_destroy_related_without_flag(cdev_t dev, uint32_t flag) |
ca8d7677 MD |
668 | { |
669 | devfs_msg_t msg; | |
670 | ||
671 | msg = devfs_msg_get(); | |
72ea429e | 672 | msg->mdv_flags.dev = dev; |
ca8d7677 | 673 | msg->mdv_flags.flag = flag; |
72ea429e | 674 | msg = devfs_msg_send_sync(DEVFS_DESTROY_RELATED_WO_FLAG, msg); |
ca8d7677 MD |
675 | devfs_msg_put(msg); |
676 | ||
21864bc5 MD |
677 | return 0; |
678 | } | |
679 | ||
680 | /* | |
ca8d7677 MD |
681 | * devfs_create_all_dev is the asynchronous entry point to trigger device |
682 | * node creation. It just sends a message with the relevant details to | |
683 | * the devfs core. | |
21864bc5 MD |
684 | */ |
685 | int | |
686 | devfs_create_all_dev(struct devfs_node *root) | |
687 | { | |
688 | devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | /* | |
ca8d7677 MD |
693 | * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all |
694 | * devices with a specific set of dev_ops and minor. It just sends a | |
695 | * message with the relevant details to the devfs core. | |
21864bc5 MD |
696 | */ |
697 | int | |
698 | devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor) | |
699 | { | |
700 | devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor); | |
701 | return 0; | |
702 | } | |
703 | ||
704 | /* | |
ca8d7677 MD |
705 | * devfs_clone_handler_add is the synchronous entry point to add a new |
706 | * clone handler. It just sends a message with the relevant details to | |
707 | * the devfs core. | |
21864bc5 MD |
708 | */ |
709 | int | |
07dfa375 | 710 | devfs_clone_handler_add(const char *name, d_clone_t *nhandler) |
21864bc5 | 711 | { |
ca8d7677 MD |
712 | devfs_msg_t msg; |
713 | ||
714 | msg = devfs_msg_get(); | |
d0fe8596 | 715 | msg->mdv_chandler.name = name; |
ca8d7677 MD |
716 | msg->mdv_chandler.nhandler = nhandler; |
717 | msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg); | |
718 | devfs_msg_put(msg); | |
21864bc5 MD |
719 | return 0; |
720 | } | |
721 | ||
722 | /* | |
ca8d7677 MD |
723 | * devfs_clone_handler_del is the synchronous entry point to remove a |
724 | * clone handler. It just sends a message with the relevant details to | |
725 | * the devfs core. | |
21864bc5 MD |
726 | */ |
727 | int | |
07dfa375 | 728 | devfs_clone_handler_del(const char *name) |
21864bc5 | 729 | { |
ca8d7677 MD |
730 | devfs_msg_t msg; |
731 | ||
732 | msg = devfs_msg_get(); | |
d0fe8596 | 733 | msg->mdv_chandler.name = name; |
ca8d7677 MD |
734 | msg->mdv_chandler.nhandler = NULL; |
735 | msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg); | |
736 | devfs_msg_put(msg); | |
21864bc5 MD |
737 | return 0; |
738 | } | |
739 | ||
740 | /* | |
ca8d7677 MD |
741 | * devfs_find_device_by_name is the synchronous entry point to find a |
742 | * device given its name. It sends a synchronous message with the | |
743 | * relevant details to the devfs core and returns the answer. | |
21864bc5 MD |
744 | */ |
745 | cdev_t | |
746 | devfs_find_device_by_name(const char *fmt, ...) | |
747 | { | |
748 | cdev_t found = NULL; | |
749 | devfs_msg_t msg; | |
da655383 | 750 | char *target; |
21864bc5 | 751 | __va_list ap; |
21864bc5 MD |
752 | |
753 | if (fmt == NULL) | |
754 | return NULL; | |
755 | ||
21864bc5 | 756 | __va_start(ap, fmt); |
da655383 | 757 | kvasnrprintf(&target, PATH_MAX, 10, fmt, ap); |
21864bc5 MD |
758 | __va_end(ap); |
759 | ||
21864bc5 | 760 | msg = devfs_msg_get(); |
ca8d7677 | 761 | msg->mdv_name = target; |
21864bc5 | 762 | msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg); |
ca8d7677 | 763 | found = msg->mdv_cdev; |
21864bc5 | 764 | devfs_msg_put(msg); |
da655383 | 765 | kvasfree(&target); |
21864bc5 | 766 | |
21864bc5 MD |
767 | return found; |
768 | } | |
769 | ||
770 | /* | |
ca8d7677 MD |
771 | * devfs_find_device_by_udev is the synchronous entry point to find a |
772 | * device given its udev number. It sends a synchronous message with | |
773 | * the relevant details to the devfs core and returns the answer. | |
21864bc5 MD |
774 | */ |
775 | cdev_t | |
776 | devfs_find_device_by_udev(udev_t udev) | |
777 | { | |
778 | cdev_t found = NULL; | |
779 | devfs_msg_t msg; | |
780 | ||
781 | msg = devfs_msg_get(); | |
ca8d7677 | 782 | msg->mdv_udev = udev; |
21864bc5 | 783 | msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg); |
ca8d7677 | 784 | found = msg->mdv_cdev; |
21864bc5 MD |
785 | devfs_msg_put(msg); |
786 | ||
ca8d7677 MD |
787 | devfs_debug(DEVFS_DEBUG_DEBUG, |
788 | "devfs_find_device_by_udev found? %s -end:3-\n", | |
789 | ((found) ? found->si_name:"NO")); | |
21864bc5 MD |
790 | return found; |
791 | } | |
792 | ||
fa7e6f37 AH |
793 | struct vnode * |
794 | devfs_inode_to_vnode(struct mount *mp, ino_t target) | |
795 | { | |
796 | struct vnode *vp = NULL; | |
797 | devfs_msg_t msg; | |
798 | ||
799 | if (mp == NULL) | |
800 | return NULL; | |
801 | ||
802 | msg = devfs_msg_get(); | |
803 | msg->mdv_ino.mp = mp; | |
804 | msg->mdv_ino.ino = target; | |
805 | msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg); | |
806 | vp = msg->mdv_ino.vp; | |
807 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); | |
808 | devfs_msg_put(msg); | |
809 | ||
810 | return vp; | |
811 | } | |
812 | ||
21864bc5 | 813 | /* |
ca8d7677 MD |
814 | * devfs_make_alias is the asynchronous entry point to register an alias |
815 | * for a device. It just sends a message with the relevant details to the | |
816 | * devfs core. | |
21864bc5 MD |
817 | */ |
818 | int | |
07dfa375 | 819 | devfs_make_alias(const char *name, cdev_t dev_target) |
21864bc5 | 820 | { |
ca8d7677 | 821 | struct devfs_alias *alias; |
5298e788 AH |
822 | size_t len; |
823 | ||
824 | len = strlen(name); | |
ca8d7677 MD |
825 | |
826 | alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK); | |
07dfa375 | 827 | alias->name = kstrdup(name, M_DEVFS); |
5298e788 | 828 | alias->namlen = len; |
21864bc5 MD |
829 | alias->dev_target = dev_target; |
830 | ||
831 | devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias); | |
832 | return 0; | |
833 | } | |
834 | ||
8312ca30 AH |
835 | /* |
836 | * devfs_destroy_alias is the asynchronous entry point to deregister an alias | |
837 | * for a device. It just sends a message with the relevant details to the | |
838 | * devfs core. | |
839 | */ | |
840 | int | |
841 | devfs_destroy_alias(const char *name, cdev_t dev_target) | |
842 | { | |
843 | struct devfs_alias *alias; | |
844 | size_t len; | |
845 | ||
846 | len = strlen(name); | |
847 | ||
848 | alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK); | |
849 | alias->name = kstrdup(name, M_DEVFS); | |
850 | alias->namlen = len; | |
851 | alias->dev_target = dev_target; | |
852 | ||
853 | devfs_msg_send_generic(DEVFS_DESTROY_ALIAS, alias); | |
854 | return 0; | |
855 | } | |
856 | ||
21864bc5 | 857 | /* |
ca8d7677 MD |
858 | * devfs_apply_rules is the asynchronous entry point to trigger application |
859 | * of all rules. It just sends a message with the relevant details to the | |
860 | * devfs core. | |
21864bc5 MD |
861 | */ |
862 | int | |
863 | devfs_apply_rules(char *mntto) | |
864 | { | |
865 | char *new_name; | |
21864bc5 | 866 | |
07dfa375 | 867 | new_name = kstrdup(mntto, M_DEVFS); |
21864bc5 | 868 | devfs_msg_send_name(DEVFS_APPLY_RULES, new_name); |
bc185c5a | 869 | |
21864bc5 MD |
870 | return 0; |
871 | } | |
872 | ||
873 | /* | |
bc185c5a AH |
874 | * devfs_reset_rules is the asynchronous entry point to trigger reset of all |
875 | * rules. It just sends a message with the relevant details to the devfs core. | |
21864bc5 MD |
876 | */ |
877 | int | |
878 | devfs_reset_rules(char *mntto) | |
879 | { | |
880 | char *new_name; | |
21864bc5 | 881 | |
07dfa375 | 882 | new_name = kstrdup(mntto, M_DEVFS); |
21864bc5 | 883 | devfs_msg_send_name(DEVFS_RESET_RULES, new_name); |
bc185c5a | 884 | |
21864bc5 MD |
885 | return 0; |
886 | } | |
887 | ||
888 | ||
889 | /* | |
890 | * devfs_scan_callback is the asynchronous entry point to call a callback | |
891 | * on all cdevs. | |
892 | * It just sends a message with the relevant details to the devfs core. | |
893 | */ | |
894 | int | |
3a3826b3 | 895 | devfs_scan_callback(devfs_scan_t *callback, void *arg) |
21864bc5 MD |
896 | { |
897 | devfs_msg_t msg; | |
898 | ||
2d7c4a1e | 899 | KKASSERT(callback); |
21864bc5 MD |
900 | |
901 | msg = devfs_msg_get(); | |
ca8d7677 | 902 | msg->mdv_load = callback; |
3a3826b3 | 903 | msg->mdv_load2 = arg; |
21864bc5 MD |
904 | msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg); |
905 | devfs_msg_put(msg); | |
906 | ||
907 | return 0; | |
908 | } | |
909 | ||
910 | ||
911 | /* | |
bc185c5a AH |
912 | * Acts as a message drain. Any message that is replied to here gets destroyed |
913 | * and the memory freed. | |
21864bc5 MD |
914 | */ |
915 | static void | |
916 | devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg) | |
917 | { | |
918 | devfs_msg_put((devfs_msg_t)msg); | |
919 | } | |
920 | ||
921 | /* | |
922 | * devfs_msg_get allocates a new devfs msg and returns it. | |
923 | */ | |
924 | devfs_msg_t | |
b815579b | 925 | devfs_msg_get(void) |
21864bc5 MD |
926 | { |
927 | return objcache_get(devfs_msg_cache, M_WAITOK); | |
928 | } | |
929 | ||
930 | /* | |
931 | * devfs_msg_put deallocates a given devfs msg. | |
932 | */ | |
933 | int | |
934 | devfs_msg_put(devfs_msg_t msg) | |
935 | { | |
936 | objcache_put(devfs_msg_cache, msg); | |
937 | return 0; | |
938 | } | |
939 | ||
940 | /* | |
941 | * devfs_msg_send is the generic asynchronous message sending facility | |
942 | * for devfs. By default the reply port is the automatic disposal port. | |
d0fe8596 MD |
943 | * |
944 | * If the current thread is the devfs_msg_port thread we execute the | |
945 | * operation synchronously. | |
21864bc5 | 946 | */ |
d0fe8596 | 947 | void |
21864bc5 MD |
948 | devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg) |
949 | { | |
950 | lwkt_port_t port = &devfs_msg_port; | |
951 | ||
d0fe8596 | 952 | lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0); |
21864bc5 | 953 | |
d0fe8596 | 954 | devfs_msg->hdr.u.ms_result = cmd; |
21864bc5 | 955 | |
d0fe8596 MD |
956 | if (port->mpu_td == curthread) { |
957 | devfs_msg_exec(devfs_msg); | |
958 | lwkt_replymsg(&devfs_msg->hdr, 0); | |
959 | } else { | |
960 | lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg); | |
961 | } | |
21864bc5 MD |
962 | } |
963 | ||
964 | /* | |
965 | * devfs_msg_send_sync is the generic synchronous message sending | |
966 | * facility for devfs. It initializes a local reply port and waits | |
967 | * for the core's answer. This answer is then returned. | |
968 | */ | |
969 | devfs_msg_t | |
970 | devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg) | |
971 | { | |
972 | struct lwkt_port rep_port; | |
973 | devfs_msg_t msg_incoming; | |
974 | lwkt_port_t port = &devfs_msg_port; | |
975 | ||
976 | lwkt_initport_thread(&rep_port, curthread); | |
d0fe8596 | 977 | lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0); |
21864bc5 | 978 | |
d0fe8596 | 979 | devfs_msg->hdr.u.ms_result = cmd; |
21864bc5 | 980 | |
d0fe8596 | 981 | lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg); |
21864bc5 MD |
982 | msg_incoming = lwkt_waitport(&rep_port, 0); |
983 | ||
984 | return msg_incoming; | |
985 | } | |
986 | ||
987 | /* | |
988 | * sends a message with a generic argument. | |
989 | */ | |
d0fe8596 | 990 | void |
21864bc5 MD |
991 | devfs_msg_send_generic(uint32_t cmd, void *load) |
992 | { | |
d0fe8596 | 993 | devfs_msg_t devfs_msg = devfs_msg_get(); |
21864bc5 | 994 | |
d0fe8596 MD |
995 | devfs_msg->mdv_load = load; |
996 | devfs_msg_send(cmd, devfs_msg); | |
21864bc5 MD |
997 | } |
998 | ||
999 | /* | |
1000 | * sends a message with a name argument. | |
1001 | */ | |
d0fe8596 | 1002 | void |
21864bc5 MD |
1003 | devfs_msg_send_name(uint32_t cmd, char *name) |
1004 | { | |
d0fe8596 | 1005 | devfs_msg_t devfs_msg = devfs_msg_get(); |
21864bc5 | 1006 | |
d0fe8596 MD |
1007 | devfs_msg->mdv_name = name; |
1008 | devfs_msg_send(cmd, devfs_msg); | |
21864bc5 MD |
1009 | } |
1010 | ||
1011 | /* | |
1012 | * sends a message with a mount argument. | |
1013 | */ | |
d0fe8596 | 1014 | void |
21864bc5 MD |
1015 | devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt) |
1016 | { | |
d0fe8596 | 1017 | devfs_msg_t devfs_msg = devfs_msg_get(); |
21864bc5 | 1018 | |
d0fe8596 MD |
1019 | devfs_msg->mdv_mnt = mnt; |
1020 | devfs_msg_send(cmd, devfs_msg); | |
21864bc5 MD |
1021 | } |
1022 | ||
1023 | /* | |
1024 | * sends a message with an ops argument. | |
1025 | */ | |
d0fe8596 | 1026 | void |
21864bc5 MD |
1027 | devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor) |
1028 | { | |
d0fe8596 | 1029 | devfs_msg_t devfs_msg = devfs_msg_get(); |
21864bc5 | 1030 | |
d0fe8596 MD |
1031 | devfs_msg->mdv_ops.ops = ops; |
1032 | devfs_msg->mdv_ops.minor = minor; | |
1033 | devfs_msg_send(cmd, devfs_msg); | |
21864bc5 MD |
1034 | } |
1035 | ||
1036 | /* | |
1037 | * sends a message with a clone handler argument. | |
1038 | */ | |
d0fe8596 | 1039 | void |
21864bc5 MD |
1040 | devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler) |
1041 | { | |
d0fe8596 | 1042 | devfs_msg_t devfs_msg = devfs_msg_get(); |
21864bc5 | 1043 | |
d0fe8596 MD |
1044 | devfs_msg->mdv_chandler.name = name; |
1045 | devfs_msg->mdv_chandler.nhandler = handler; | |
1046 | devfs_msg_send(cmd, devfs_msg); | |
21864bc5 MD |
1047 | } |
1048 | ||
1049 | /* | |
1050 | * sends a message with a device argument. | |
1051 | */ | |
d0fe8596 | 1052 | void |
21864bc5 MD |
1053 | devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms) |
1054 | { | |
d0fe8596 MD |
1055 | devfs_msg_t devfs_msg = devfs_msg_get(); |
1056 | ||
1057 | devfs_msg->mdv_dev.dev = dev; | |
ca8d7677 MD |
1058 | devfs_msg->mdv_dev.uid = uid; |
1059 | devfs_msg->mdv_dev.gid = gid; | |
1060 | devfs_msg->mdv_dev.perms = perms; | |
21864bc5 | 1061 | |
d0fe8596 | 1062 | devfs_msg_send(cmd, devfs_msg); |
21864bc5 MD |
1063 | } |
1064 | ||
1065 | /* | |
1066 | * sends a message with a link argument. | |
1067 | */ | |
d0fe8596 | 1068 | void |
21864bc5 MD |
1069 | devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp) |
1070 | { | |
d0fe8596 MD |
1071 | devfs_msg_t devfs_msg = devfs_msg_get(); |
1072 | ||
1073 | devfs_msg->mdv_link.name = name; | |
ca8d7677 MD |
1074 | devfs_msg->mdv_link.target = target; |
1075 | devfs_msg->mdv_link.mp = mp; | |
d0fe8596 | 1076 | devfs_msg_send(cmd, devfs_msg); |
21864bc5 MD |
1077 | } |
1078 | ||
1079 | /* | |
1080 | * devfs_msg_core is the main devfs thread. It handles all incoming messages | |
1081 | * and calls the relevant worker functions. By using messages it's assured | |
1082 | * that events occur in the correct order. | |
1083 | */ | |
1084 | static void | |
1085 | devfs_msg_core(void *arg) | |
1086 | { | |
ca8d7677 | 1087 | devfs_msg_t msg; |
21864bc5 | 1088 | |
21864bc5 | 1089 | lwkt_initport_thread(&devfs_msg_port, curthread); |
c9e9fb21 MD |
1090 | |
1091 | lockmgr(&devfs_lock, LK_EXCLUSIVE); | |
1092 | devfs_run = 1; | |
bc185c5a | 1093 | wakeup(td_core); |
c9e9fb21 MD |
1094 | lockmgr(&devfs_lock, LK_RELEASE); |
1095 | ||
1096 | get_mplock(); /* mpsafe yet? */ | |
21864bc5 | 1097 | |
d0fe8596 | 1098 | while (devfs_run) { |
ca8d7677 | 1099 | msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0); |
bc185c5a | 1100 | devfs_debug(DEVFS_DEBUG_DEBUG, |
d0fe8596 MD |
1101 | "devfs_msg_core, new msg: %x\n", |
1102 | (unsigned int)msg->hdr.u.ms_result); | |
1103 | devfs_msg_exec(msg); | |
1104 | lwkt_replymsg(&msg->hdr, 0); | |
1105 | } | |
c9e9fb21 MD |
1106 | |
1107 | rel_mplock(); | |
d0fe8596 | 1108 | wakeup(td_core); |
c9e9fb21 | 1109 | |
d0fe8596 MD |
1110 | lwkt_exit(); |
1111 | } | |
21864bc5 | 1112 | |
d0fe8596 MD |
1113 | static void |
1114 | devfs_msg_exec(devfs_msg_t msg) | |
1115 | { | |
1116 | struct devfs_mnt_data *mnt; | |
1117 | struct devfs_node *node; | |
1118 | cdev_t dev; | |
fa7e6f37 | 1119 | |
d0fe8596 MD |
1120 | /* |
1121 | * Acquire the devfs lock to ensure safety of all called functions | |
1122 | */ | |
1123 | lockmgr(&devfs_lock, LK_EXCLUSIVE); | |
1124 | ||
1125 | switch (msg->hdr.u.ms_result) { | |
1126 | case DEVFS_DEVICE_CREATE: | |
1127 | dev = msg->mdv_dev.dev; | |
1128 | devfs_create_dev_worker(dev, | |
1129 | msg->mdv_dev.uid, | |
1130 | msg->mdv_dev.gid, | |
1131 | msg->mdv_dev.perms); | |
1132 | break; | |
1133 | case DEVFS_DEVICE_DESTROY: | |
1134 | dev = msg->mdv_dev.dev; | |
1135 | devfs_destroy_dev_worker(dev); | |
1136 | break; | |
72ea429e AH |
1137 | case DEVFS_DESTROY_RELATED: |
1138 | devfs_destroy_related_worker(msg->mdv_load); | |
d0fe8596 MD |
1139 | break; |
1140 | case DEVFS_DESTROY_DEV_BY_OPS: | |
1141 | devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops, | |
1142 | msg->mdv_ops.minor); | |
1143 | break; | |
1144 | case DEVFS_CREATE_ALL_DEV: | |
1145 | node = (struct devfs_node *)msg->mdv_load; | |
1146 | devfs_create_all_dev_worker(node); | |
1147 | break; | |
1148 | case DEVFS_MOUNT_ADD: | |
1149 | mnt = msg->mdv_mnt; | |
1150 | TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link); | |
1151 | devfs_create_all_dev_worker(mnt->root_node); | |
1152 | break; | |
1153 | case DEVFS_MOUNT_DEL: | |
1154 | mnt = msg->mdv_mnt; | |
1155 | TAILQ_REMOVE(&devfs_mnt_list, mnt, link); | |
66abefa5 AH |
1156 | devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback, |
1157 | NULL); | |
d0fe8596 MD |
1158 | if (mnt->leak_count) { |
1159 | devfs_debug(DEVFS_DEBUG_SHOW, | |
71f27d2d | 1160 | "Leaked %ld devfs_node elements!\n", |
d0fe8596 | 1161 | mnt->leak_count); |
ca8d7677 | 1162 | } |
d0fe8596 MD |
1163 | break; |
1164 | case DEVFS_CHANDLER_ADD: | |
1165 | devfs_chandler_add_worker(msg->mdv_chandler.name, | |
1166 | msg->mdv_chandler.nhandler); | |
1167 | break; | |
1168 | case DEVFS_CHANDLER_DEL: | |
1169 | devfs_chandler_del_worker(msg->mdv_chandler.name); | |
1170 | break; | |
1171 | case DEVFS_FIND_DEVICE_BY_NAME: | |
1172 | devfs_find_device_by_name_worker(msg); | |
1173 | break; | |
1174 | case DEVFS_FIND_DEVICE_BY_UDEV: | |
1175 | devfs_find_device_by_udev_worker(msg); | |
1176 | break; | |
1177 | case DEVFS_MAKE_ALIAS: | |
1178 | devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load); | |
1179 | break; | |
8312ca30 AH |
1180 | case DEVFS_DESTROY_ALIAS: |
1181 | devfs_destroy_alias_worker((struct devfs_alias *)msg->mdv_load); | |
1182 | break; | |
d0fe8596 MD |
1183 | case DEVFS_APPLY_RULES: |
1184 | devfs_apply_reset_rules_caller(msg->mdv_name, 1); | |
1185 | break; | |
1186 | case DEVFS_RESET_RULES: | |
1187 | devfs_apply_reset_rules_caller(msg->mdv_name, 0); | |
1188 | break; | |
1189 | case DEVFS_SCAN_CALLBACK: | |
3a3826b3 AH |
1190 | devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load, |
1191 | msg->mdv_load2); | |
d0fe8596 | 1192 | break; |
72ea429e AH |
1193 | case DEVFS_CLR_RELATED_FLAG: |
1194 | devfs_clr_related_flag_worker(msg->mdv_flags.dev, | |
d0fe8596 MD |
1195 | msg->mdv_flags.flag); |
1196 | break; | |
72ea429e AH |
1197 | case DEVFS_DESTROY_RELATED_WO_FLAG: |
1198 | devfs_destroy_related_without_flag_worker(msg->mdv_flags.dev, | |
d0fe8596 MD |
1199 | msg->mdv_flags.flag); |
1200 | break; | |
1201 | case DEVFS_INODE_TO_VNODE: | |
66abefa5 AH |
1202 | msg->mdv_ino.vp = devfs_iterate_topology( |
1203 | DEVFS_MNTDATA(msg->mdv_ino.mp)->root_node, | |
1204 | (devfs_iterate_callback_t *)devfs_inode_to_vnode_worker_callback, | |
1205 | &msg->mdv_ino.ino); | |
d0fe8596 MD |
1206 | break; |
1207 | case DEVFS_TERMINATE_CORE: | |
1208 | devfs_run = 0; | |
1209 | break; | |
1210 | case DEVFS_SYNC: | |
1211 | break; | |
1212 | default: | |
1213 | devfs_debug(DEVFS_DEBUG_WARNING, | |
1214 | "devfs_msg_core: unknown message " | |
1215 | "received at core\n"); | |
1216 | break; | |
ca8d7677 | 1217 | } |
d0fe8596 | 1218 | lockmgr(&devfs_lock, LK_RELEASE); |
21864bc5 MD |
1219 | } |
1220 | ||
1221 | /* | |
1222 | * Worker function to insert a new dev into the dev list and initialize its | |
1223 | * permissions. It also calls devfs_propagate_dev which in turn propagates | |
1224 | * the change to all mount points. | |
ca8d7677 MD |
1225 | * |
1226 | * The passed dev is already referenced. This reference is eaten by this | |
1227 | * function and represents the dev's linkage into devfs_dev_list. | |
21864bc5 MD |
1228 | */ |
1229 | static int | |
1230 | devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms) | |
1231 | { | |
1232 | KKASSERT(dev); | |
21864bc5 MD |
1233 | |
1234 | dev->si_uid = uid; | |
1235 | dev->si_gid = gid; | |
1236 | dev->si_perms = perms; | |
1237 | ||
1238 | devfs_link_dev(dev); | |
21864bc5 MD |
1239 | devfs_propagate_dev(dev, 1); |
1240 | ||
3a3826b3 AH |
1241 | udev_event_attach(dev, NULL, 0); |
1242 | ||
21864bc5 MD |
1243 | return 0; |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * Worker function to delete a dev from the dev list and free the cdev. | |
1248 | * It also calls devfs_propagate_dev which in turn propagates the change | |
1249 | * to all mount points. | |
1250 | */ | |
1251 | static int | |
1252 | devfs_destroy_dev_worker(cdev_t dev) | |
1253 | { | |
ca8d7677 MD |
1254 | int error; |
1255 | ||
21864bc5 MD |
1256 | KKASSERT(dev); |
1257 | KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE); | |
1258 | ||
ca8d7677 | 1259 | error = devfs_unlink_dev(dev); |
21864bc5 | 1260 | devfs_propagate_dev(dev, 0); |
3a3826b3 AH |
1261 | |
1262 | udev_event_detach(dev, NULL, 0); | |
1263 | ||
ca8d7677 MD |
1264 | if (error == 0) |
1265 | release_dev(dev); /* link ref */ | |
21864bc5 MD |
1266 | release_dev(dev); |
1267 | release_dev(dev); | |
21864bc5 | 1268 | |
21864bc5 MD |
1269 | return 0; |
1270 | } | |
1271 | ||
1272 | /* | |
1273 | * Worker function to destroy all devices with a certain basename. | |
1274 | * Calls devfs_destroy_dev_worker for the actual destruction. | |
1275 | */ | |
1276 | static int | |
72ea429e | 1277 | devfs_destroy_related_worker(cdev_t needle) |
21864bc5 | 1278 | { |
72ea429e | 1279 | cdev_t dev; |
21864bc5 | 1280 | |
72ea429e AH |
1281 | restart: |
1282 | devfs_debug(DEVFS_DEBUG_DEBUG, "related worker: %s\n", | |
1283 | needle->si_name); | |
1284 | TAILQ_FOREACH(dev, &devfs_dev_list, link) { | |
1285 | if (dev->si_parent == needle) { | |
1286 | devfs_destroy_related_worker(dev); | |
bc185c5a | 1287 | devfs_destroy_dev_worker(dev); |
72ea429e | 1288 | goto restart; |
21864bc5 | 1289 | } |
ca8d7677 MD |
1290 | } |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | static int | |
72ea429e | 1295 | devfs_clr_related_flag_worker(cdev_t needle, uint32_t flag) |
ca8d7677 MD |
1296 | { |
1297 | cdev_t dev, dev1; | |
ca8d7677 MD |
1298 | |
1299 | TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { | |
72ea429e AH |
1300 | if (dev->si_parent == needle) { |
1301 | devfs_clr_related_flag_worker(dev, flag); | |
bc185c5a | 1302 | dev->si_flags &= ~flag; |
ca8d7677 MD |
1303 | } |
1304 | } | |
1305 | ||
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | static int | |
72ea429e | 1310 | devfs_destroy_related_without_flag_worker(cdev_t needle, uint32_t flag) |
ca8d7677 | 1311 | { |
72ea429e | 1312 | cdev_t dev; |
ca8d7677 | 1313 | |
72ea429e AH |
1314 | restart: |
1315 | devfs_debug(DEVFS_DEBUG_DEBUG, "related_wo_flag: %s\n", | |
1316 | needle->si_name); | |
1317 | ||
1318 | TAILQ_FOREACH(dev, &devfs_dev_list, link) { | |
1319 | if (dev->si_parent == needle) { | |
1320 | devfs_destroy_related_without_flag_worker(dev, flag); | |
bc185c5a AH |
1321 | if (!(dev->si_flags & flag)) { |
1322 | devfs_destroy_dev_worker(dev); | |
72ea429e AH |
1323 | devfs_debug(DEVFS_DEBUG_DEBUG, |
1324 | "related_wo_flag: %s restart\n", dev->si_name); | |
1325 | goto restart; | |
ca8d7677 MD |
1326 | } |
1327 | } | |
1328 | } | |
21864bc5 MD |
1329 | |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * Worker function that creates all device nodes on top of a devfs | |
1335 | * root node. | |
1336 | */ | |
1337 | static int | |
1338 | devfs_create_all_dev_worker(struct devfs_node *root) | |
1339 | { | |
1340 | cdev_t dev; | |
1341 | ||
1342 | KKASSERT(root); | |
21864bc5 | 1343 | |
d0fe8596 | 1344 | TAILQ_FOREACH(dev, &devfs_dev_list, link) { |
21864bc5 | 1345 | devfs_create_device_node(root, dev, NULL, NULL); |
d0fe8596 | 1346 | } |
bc185c5a | 1347 | |
21864bc5 MD |
1348 | return 0; |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * Worker function that destroys all devices that match a specific | |
1353 | * dev_ops and/or minor. If minor is less than 0, it is not matched | |
1354 | * against. It also propagates all changes. | |
1355 | */ | |
1356 | static int | |
1357 | devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor) | |
1358 | { | |
1359 | cdev_t dev, dev1; | |
1360 | ||
1361 | KKASSERT(ops); | |
ca8d7677 MD |
1362 | |
1363 | TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { | |
1364 | if (dev->si_ops != ops) | |
1365 | continue; | |
1366 | if ((minor < 0) || (dev->si_uminor == minor)) { | |
ca8d7677 | 1367 | devfs_destroy_dev_worker(dev); |
21864bc5 | 1368 | } |
ca8d7677 | 1369 | } |
bc185c5a | 1370 | |
21864bc5 MD |
1371 | return 0; |
1372 | } | |
1373 | ||
1374 | /* | |
1375 | * Worker function that registers a new clone handler in devfs. | |
1376 | */ | |
1377 | static int | |
07dfa375 | 1378 | devfs_chandler_add_worker(const char *name, d_clone_t *nhandler) |
21864bc5 MD |
1379 | { |
1380 | struct devfs_clone_handler *chandler = NULL; | |
1381 | u_char len = strlen(name); | |
1382 | ||
ca8d7677 | 1383 | if (len == 0) |
21864bc5 MD |
1384 | return 1; |
1385 | ||
ca8d7677 | 1386 | TAILQ_FOREACH(chandler, &devfs_chandler_list, link) { |
bc185c5a AH |
1387 | if (chandler->namlen != len) |
1388 | continue; | |
1389 | ||
1390 | if (!memcmp(chandler->name, name, len)) { | |
1391 | /* Clonable basename already exists */ | |
1392 | return 1; | |
21864bc5 MD |
1393 | } |
1394 | } | |
1395 | ||
ca8d7677 | 1396 | chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO); |
07dfa375 | 1397 | chandler->name = kstrdup(name, M_DEVFS); |
21864bc5 MD |
1398 | chandler->namlen = len; |
1399 | chandler->nhandler = nhandler; | |
1400 | ||
1401 | TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link); | |
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | /* | |
1406 | * Worker function that removes a given clone handler from the | |
1407 | * clone handler list. | |
1408 | */ | |
1409 | static int | |
07dfa375 | 1410 | devfs_chandler_del_worker(const char *name) |
21864bc5 MD |
1411 | { |
1412 | struct devfs_clone_handler *chandler, *chandler2; | |
1413 | u_char len = strlen(name); | |
1414 | ||
ca8d7677 | 1415 | if (len == 0) |
21864bc5 MD |
1416 | return 1; |
1417 | ||
ca8d7677 MD |
1418 | TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) { |
1419 | if (chandler->namlen != len) | |
1420 | continue; | |
1421 | if (memcmp(chandler->name, name, len)) | |
1422 | continue; | |
bc185c5a | 1423 | |
ca8d7677 | 1424 | TAILQ_REMOVE(&devfs_chandler_list, chandler, link); |
5298e788 | 1425 | kfree(chandler->name, M_DEVFS); |
ca8d7677 | 1426 | kfree(chandler, M_DEVFS); |
5298e788 | 1427 | break; |
21864bc5 MD |
1428 | } |
1429 | ||
1430 | return 0; | |
1431 | } | |
1432 | ||
1433 | /* | |
1434 | * Worker function that finds a given device name and changes | |
1435 | * the message received accordingly so that when replied to, | |
1436 | * the answer is returned to the caller. | |
1437 | */ | |
1438 | static int | |
1439 | devfs_find_device_by_name_worker(devfs_msg_t devfs_msg) | |
1440 | { | |
6507240b MD |
1441 | struct devfs_alias *alias; |
1442 | cdev_t dev; | |
21864bc5 | 1443 | cdev_t found = NULL; |
21864bc5 | 1444 | |
6507240b MD |
1445 | TAILQ_FOREACH(dev, &devfs_dev_list, link) { |
1446 | if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) { | |
21864bc5 MD |
1447 | found = dev; |
1448 | break; | |
1449 | } | |
ca8d7677 | 1450 | } |
6507240b MD |
1451 | if (found == NULL) { |
1452 | TAILQ_FOREACH(alias, &devfs_alias_list, link) { | |
1453 | if (strcmp(devfs_msg->mdv_name, alias->name) == 0) { | |
1454 | found = alias->dev_target; | |
1455 | break; | |
1456 | } | |
1457 | } | |
1458 | } | |
ca8d7677 | 1459 | devfs_msg->mdv_cdev = found; |
21864bc5 MD |
1460 | |
1461 | return 0; | |
1462 | } | |
1463 | ||
1464 | /* | |
1465 | * Worker function that finds a given device udev and changes | |
1466 | * the message received accordingly so that when replied to, | |
1467 | * the answer is returned to the caller. | |
1468 | */ | |
1469 | static int | |
1470 | devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg) | |
1471 | { | |
1472 | cdev_t dev, dev1; | |
1473 | cdev_t found = NULL; | |
21864bc5 | 1474 | |
ca8d7677 MD |
1475 | TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { |
1476 | if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) { | |
21864bc5 MD |
1477 | found = dev; |
1478 | break; | |
1479 | } | |
ca8d7677 MD |
1480 | } |
1481 | devfs_msg->mdv_cdev = found; | |
21864bc5 MD |
1482 | |
1483 | return 0; | |
1484 | } | |
1485 | ||
1486 | /* | |
1487 | * Worker function that inserts a given alias into the | |
1488 | * alias list, and propagates the alias to all mount | |
1489 | * points. | |
1490 | */ | |
1491 | static int | |
1492 | devfs_make_alias_worker(struct devfs_alias *alias) | |
1493 | { | |
1494 | struct devfs_alias *alias2; | |
1495 | size_t len = strlen(alias->name); | |
1496 | int found = 0; | |
1497 | ||
1498 | TAILQ_FOREACH(alias2, &devfs_alias_list, link) { | |
bc185c5a AH |
1499 | if (len != alias2->namlen) |
1500 | continue; | |
1501 | ||
1502 | if (!memcmp(alias->name, alias2->name, len)) { | |
1503 | found = 1; | |
1504 | break; | |
21864bc5 MD |
1505 | } |
1506 | } | |
1507 | ||
1508 | if (!found) { | |
bc185c5a AH |
1509 | /* |
1510 | * The alias doesn't exist yet, so we add it to the alias list | |
1511 | */ | |
21864bc5 | 1512 | TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link); |
8312ca30 | 1513 | devfs_alias_propagate(alias, 0); |
3a3826b3 | 1514 | udev_event_attach(alias->dev_target, alias->name, 1); |
21864bc5 | 1515 | } else { |
5298e788 | 1516 | devfs_debug(DEVFS_DEBUG_WARNING, |
ca8d7677 MD |
1517 | "Warning: duplicate devfs_make_alias for %s\n", |
1518 | alias->name); | |
5298e788 | 1519 | kfree(alias->name, M_DEVFS); |
21864bc5 MD |
1520 | kfree(alias, M_DEVFS); |
1521 | } | |
1522 | ||
1523 | return 0; | |
1524 | } | |
1525 | ||
8312ca30 AH |
1526 | /* |
1527 | * Worker function that delete a given alias from the | |
1528 | * alias list, and propagates the removal to all mount | |
1529 | * points. | |
1530 | */ | |
1531 | static int | |
1532 | devfs_destroy_alias_worker(struct devfs_alias *alias) | |
1533 | { | |
1534 | struct devfs_alias *alias2; | |
1535 | int found = 0; | |
1536 | ||
1537 | TAILQ_FOREACH(alias2, &devfs_alias_list, link) { | |
1538 | if (alias->dev_target != alias2->dev_target) | |
1539 | continue; | |
1540 | ||
1541 | if (devfs_WildCmp(alias->name, alias2->name) == 0) { | |
1542 | found = 1; | |
1543 | break; | |
1544 | } | |
1545 | } | |
1546 | ||
1547 | if (!found) { | |
1548 | devfs_debug(DEVFS_DEBUG_WARNING, | |
1549 | "Warning: devfs_destroy_alias for inexistant alias: %s\n", | |
1550 | alias->name); | |
1551 | kfree(alias->name, M_DEVFS); | |
1552 | kfree(alias, M_DEVFS); | |
1553 | } else { | |
1554 | /* | |
1555 | * The alias exists, so we delete it from the alias list | |
1556 | */ | |
1557 | TAILQ_REMOVE(&devfs_alias_list, alias2, link); | |
1558 | devfs_alias_propagate(alias2, 1); | |
1559 | udev_event_detach(alias2->dev_target, alias2->name, 1); | |
1560 | kfree(alias->name, M_DEVFS); | |
1561 | kfree(alias, M_DEVFS); | |
1562 | kfree(alias2->name, M_DEVFS); | |
1563 | kfree(alias2, M_DEVFS); | |
1564 | } | |
1565 | ||
1566 | return 0; | |
1567 | } | |
1568 | ||
21864bc5 MD |
1569 | /* |
1570 | * Function that removes and frees all aliases. | |
1571 | */ | |
1572 | static int | |
1573 | devfs_alias_reap(void) | |
1574 | { | |
1575 | struct devfs_alias *alias, *alias2; | |
1576 | ||
1577 | TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) { | |
1578 | TAILQ_REMOVE(&devfs_alias_list, alias, link); | |
8312ca30 | 1579 | kfree(alias->name, M_DEVFS); |
21864bc5 MD |
1580 | kfree(alias, M_DEVFS); |
1581 | } | |
1582 | return 0; | |
1583 | } | |
1584 | ||
1585 | /* | |
1586 | * Function that removes an alias matching a specific cdev and frees | |
1587 | * it accordingly. | |
1588 | */ | |
1589 | static int | |
1590 | devfs_alias_remove(cdev_t dev) | |
1591 | { | |
1592 | struct devfs_alias *alias, *alias2; | |
1593 | ||
1594 | TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) { | |
1595 | if (alias->dev_target == dev) { | |
1596 | TAILQ_REMOVE(&devfs_alias_list, alias, link); | |
3a3826b3 | 1597 | udev_event_detach(alias->dev_target, alias->name, 1); |
8312ca30 | 1598 | kfree(alias->name, M_DEVFS); |
21864bc5 MD |
1599 | kfree(alias, M_DEVFS); |
1600 | } | |
1601 | } | |
1602 | return 0; | |
1603 | } | |
1604 | ||
1605 | /* | |
8312ca30 AH |
1606 | * This function propagates an alias addition or removal to |
1607 | * all mount points. | |
21864bc5 MD |
1608 | */ |
1609 | static int | |
8312ca30 | 1610 | devfs_alias_propagate(struct devfs_alias *alias, int remove) |
21864bc5 MD |
1611 | { |
1612 | struct devfs_mnt_data *mnt; | |
1613 | ||
1614 | TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { | |
8312ca30 AH |
1615 | if (remove) { |
1616 | devfs_destroy_node(mnt->root_node, alias->name); | |
1617 | } else { | |
1618 | devfs_alias_apply(mnt->root_node, alias); | |
1619 | } | |
21864bc5 MD |
1620 | } |
1621 | return 0; | |
1622 | } | |
1623 | ||
1624 | /* | |
1625 | * This function is a recursive function iterating through | |
1626 | * all device nodes in the topology and, if applicable, | |
1627 | * creating the relevant alias for a device node. | |
1628 | */ | |
1629 | static int | |
1630 | devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias) | |
1631 | { | |
1632 | struct devfs_node *node1, *node2; | |
1633 | ||
1634 | KKASSERT(alias != NULL); | |
1635 | ||
8e78a293 | 1636 | if ((node->node_type == Nroot) || (node->node_type == Ndir)) { |
21864bc5 | 1637 | if (node->nchildren > 2) { |
ca8d7677 | 1638 | TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) { |
21864bc5 MD |
1639 | devfs_alias_apply(node1, alias); |
1640 | } | |
1641 | } | |
1642 | } else { | |
1643 | if (node->d_dev == alias->dev_target) | |
1cb12919 | 1644 | devfs_alias_create(alias->name, node, 0); |
21864bc5 MD |
1645 | } |
1646 | return 0; | |
1647 | } | |
1648 | ||
1649 | /* | |
1650 | * This function checks if any alias possibly is applicable | |
1651 | * to the given node. If so, the alias is created. | |
1652 | */ | |
1653 | static int | |
1654 | devfs_alias_check_create(struct devfs_node *node) | |
1655 | { | |
1656 | struct devfs_alias *alias; | |
1657 | ||
1658 | TAILQ_FOREACH(alias, &devfs_alias_list, link) { | |
1659 | if (node->d_dev == alias->dev_target) | |
1cb12919 | 1660 | devfs_alias_create(alias->name, node, 0); |
21864bc5 MD |
1661 | } |
1662 | return 0; | |
1663 | } | |
1664 | ||
1665 | /* | |
1666 | * This function creates an alias with a given name | |
1667 | * linking to a given devfs node. It also increments | |
1668 | * the link count on the target node. | |
1669 | */ | |
1670 | int | |
1cb12919 | 1671 | devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based) |
21864bc5 MD |
1672 | { |
1673 | struct mount *mp = target->mp; | |
1674 | struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node; | |
1675 | struct devfs_node *linknode; | |
21864bc5 | 1676 | char *create_path = NULL; |
da655383 MD |
1677 | char *name; |
1678 | char *name_buf; | |
1679 | int result = 0; | |
21864bc5 | 1680 | |
21864bc5 MD |
1681 | KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE); |
1682 | ||
da655383 | 1683 | name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); |
21864bc5 MD |
1684 | devfs_resolve_name_path(name_orig, name_buf, &create_path, &name); |
1685 | ||
1686 | if (create_path) | |
1687 | parent = devfs_resolve_or_create_path(parent, create_path, 1); | |
1688 | ||
1689 | ||
1690 | if (devfs_find_device_node_by_name(parent, name)) { | |
bc185c5a | 1691 | devfs_debug(DEVFS_DEBUG_WARNING, |
ca8d7677 MD |
1692 | "Node already exists: %s " |
1693 | "(devfs_make_alias_worker)!\n", | |
1694 | name); | |
da655383 MD |
1695 | result = 1; |
1696 | goto done; | |
21864bc5 MD |
1697 | } |
1698 | ||
8e78a293 | 1699 | linknode = devfs_allocp(Nlink, name, parent, mp, NULL); |
da655383 MD |
1700 | if (linknode == NULL) { |
1701 | result = 1; | |
1702 | goto done; | |
1703 | } | |
21864bc5 MD |
1704 | |
1705 | linknode->link_target = target; | |
1706 | target->nlinks++; | |
21864bc5 | 1707 | |
1cb12919 AH |
1708 | if (rule_based) |
1709 | linknode->flags |= DEVFS_RULE_CREATED; | |
1710 | ||
da655383 MD |
1711 | done: |
1712 | kfree(name_buf, M_TEMP); | |
1713 | return (result); | |
21864bc5 MD |
1714 | } |
1715 | ||
1716 | /* | |
1717 | * This function is called by the core and handles mount point | |
1718 | * strings. It either calls the relevant worker (devfs_apply_ | |
1719 | * reset_rules_worker) on all mountpoints or only a specific | |
1720 | * one. | |
1721 | */ | |
1722 | static int | |
1723 | devfs_apply_reset_rules_caller(char *mountto, int apply) | |
1724 | { | |
21864bc5 | 1725 | struct devfs_mnt_data *mnt; |
21864bc5 | 1726 | |
bc185c5a | 1727 | if (mountto[0] == '*') { |
21864bc5 | 1728 | TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { |
66abefa5 AH |
1729 | devfs_iterate_topology(mnt->root_node, |
1730 | (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node), | |
1731 | NULL); | |
21864bc5 MD |
1732 | } |
1733 | } else { | |
1734 | TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { | |
9cf39e57 | 1735 | if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) { |
66abefa5 AH |
1736 | devfs_iterate_topology(mnt->root_node, |
1737 | (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node), | |
1738 | NULL); | |
bc185c5a AH |
1739 | break; |
1740 | } | |
21864bc5 MD |
1741 | } |
1742 | } | |
1743 | ||
1744 | kfree(mountto, M_DEVFS); | |
1745 | return 0; | |
1746 | } | |
1747 | ||
21864bc5 MD |
1748 | /* |
1749 | * This function calls a given callback function for | |
1750 | * every dev node in the devfs dev list. | |
1751 | */ | |
1752 | static int | |
3a3826b3 | 1753 | devfs_scan_callback_worker(devfs_scan_t *callback, void *arg) |
21864bc5 MD |
1754 | { |
1755 | cdev_t dev, dev1; | |
b28e21ef | 1756 | struct devfs_alias *alias, *alias1; |
21864bc5 | 1757 | |
d0fe8596 | 1758 | TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) { |
b28e21ef SW |
1759 | callback(dev->si_name, dev, false, arg); |
1760 | } | |
1761 | TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias1) { | |
1762 | callback(alias->name, alias->dev_target, true, arg); | |
d0fe8596 | 1763 | } |
21864bc5 | 1764 | |
21864bc5 MD |
1765 | return 0; |
1766 | } | |
1767 | ||
21864bc5 MD |
1768 | /* |
1769 | * This function tries to resolve a given directory, or if not | |
1770 | * found and creation requested, creates the given directory. | |
1771 | */ | |
1772 | static struct devfs_node * | |
ca8d7677 MD |
1773 | devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name, |
1774 | size_t name_len, int create) | |
21864bc5 MD |
1775 | { |
1776 | struct devfs_node *node, *found = NULL; | |
1777 | ||
1778 | TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) { | |
bc185c5a AH |
1779 | if (name_len != node->d_dir.d_namlen) |
1780 | continue; | |
1781 | ||
1782 | if (!memcmp(dir_name, node->d_dir.d_name, name_len)) { | |
1783 | found = node; | |
1784 | break; | |
21864bc5 MD |
1785 | } |
1786 | } | |
1787 | ||
1788 | if ((found == NULL) && (create)) { | |
8e78a293 | 1789 | found = devfs_allocp(Ndir, dir_name, parent, parent->mp, NULL); |
21864bc5 MD |
1790 | } |
1791 | ||
1792 | return found; | |
1793 | } | |
1794 | ||
1795 | /* | |
1796 | * This function tries to resolve a complete path. If creation is requested, | |
1797 | * if a given part of the path cannot be resolved (because it doesn't exist), | |
1798 | * it is created. | |
1799 | */ | |
1800 | struct devfs_node * | |
1801 | devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create) | |
1802 | { | |
1803 | struct devfs_node *node = parent; | |
da655383 | 1804 | char *buf; |
21864bc5 MD |
1805 | size_t idx = 0; |
1806 | ||
21864bc5 MD |
1807 | if (path == NULL) |
1808 | return parent; | |
1809 | ||
da655383 | 1810 | buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); |
21864bc5 | 1811 | |
da655383 | 1812 | while (*path && idx < PATH_MAX - 1) { |
21864bc5 MD |
1813 | if (*path != '/') { |
1814 | buf[idx++] = *path; | |
1815 | } else { | |
1816 | buf[idx] = '\0'; | |
1817 | node = devfs_resolve_or_create_dir(node, buf, idx, create); | |
da655383 MD |
1818 | if (node == NULL) { |
1819 | kfree(buf, M_TEMP); | |
21864bc5 | 1820 | return NULL; |
da655383 | 1821 | } |
21864bc5 MD |
1822 | idx = 0; |
1823 | } | |
da655383 | 1824 | ++path; |
21864bc5 MD |
1825 | } |
1826 | buf[idx] = '\0'; | |
da655383 MD |
1827 | node = devfs_resolve_or_create_dir(node, buf, idx, create); |
1828 | kfree (buf, M_TEMP); | |
1829 | return (node); | |
21864bc5 MD |
1830 | } |
1831 | ||
1832 | /* | |
1833 | * Takes a full path and strips it into a directory path and a name. | |
1834 | * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It | |
1835 | * requires a working buffer with enough size to keep the whole | |
1836 | * fullpath. | |
1837 | */ | |
1838 | int | |
1839 | devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep) | |
1840 | { | |
1841 | char *name = NULL; | |
1842 | char *path = NULL; | |
1843 | size_t len = strlen(fullpath) + 1; | |
1844 | int i; | |
1845 | ||
bc185c5a AH |
1846 | KKASSERT((fullpath != NULL) && (buf != NULL)); |
1847 | KKASSERT((pathp != NULL) && (namep != NULL)); | |
21864bc5 MD |
1848 | |
1849 | memcpy(buf, fullpath, len); | |
1850 | ||
1851 | for (i = len-1; i>= 0; i--) { | |
1852 | if (buf[i] == '/') { | |
1853 | buf[i] = '\0'; | |
1854 | name = &(buf[i+1]); | |
1855 | path = buf; | |
1856 | break; | |
1857 | } | |
1858 | } | |
1859 | ||
1860 | *pathp = path; | |
1861 | ||
1862 | if (name) { | |
1863 | *namep = name; | |
1864 | } else { | |
1865 | *namep = buf; | |
1866 | } | |
1867 | ||
1868 | return 0; | |
1869 | } | |
1870 | ||
1871 | /* | |
ca8d7677 | 1872 | * This function creates a new devfs node for a given device. It can |
21864bc5 MD |
1873 | * handle a complete path as device name, and accordingly creates |
1874 | * the path and the final device node. | |
ca8d7677 MD |
1875 | * |
1876 | * The reference count on the passed dev remains unchanged. | |
21864bc5 MD |
1877 | */ |
1878 | struct devfs_node * | |
ca8d7677 MD |
1879 | devfs_create_device_node(struct devfs_node *root, cdev_t dev, |
1880 | char *dev_name, char *path_fmt, ...) | |
21864bc5 MD |
1881 | { |
1882 | struct devfs_node *parent, *node = NULL; | |
1883 | char *path = NULL; | |
da655383 MD |
1884 | char *name; |
1885 | char *name_buf; | |
21864bc5 MD |
1886 | __va_list ap; |
1887 | int i, found; | |
21864bc5 MD |
1888 | char *create_path = NULL; |
1889 | char *names = "pqrsPQRS"; | |
1890 | ||
da655383 | 1891 | name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); |
21864bc5 | 1892 | |
da655383 | 1893 | if (path_fmt != NULL) { |
21864bc5 | 1894 | __va_start(ap, path_fmt); |
da655383 | 1895 | kvasnrprintf(&path, PATH_MAX, 10, path_fmt, ap); |
21864bc5 MD |
1896 | __va_end(ap); |
1897 | } | |
1898 | ||
1899 | parent = devfs_resolve_or_create_path(root, path, 1); | |
1900 | KKASSERT(parent); | |
1901 | ||
bc185c5a AH |
1902 | devfs_resolve_name_path( |
1903 | ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name), | |
1904 | name_buf, &create_path, &name); | |
21864bc5 MD |
1905 | |
1906 | if (create_path) | |
1907 | parent = devfs_resolve_or_create_path(parent, create_path, 1); | |
1908 | ||
1909 | ||
1910 | if (devfs_find_device_node_by_name(parent, name)) { | |
bc185c5a | 1911 | devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: " |
894bbb25 | 1912 | "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name); |
21864bc5 MD |
1913 | goto out; |
1914 | } | |
bc185c5a | 1915 | |
8e78a293 | 1916 | node = devfs_allocp(Ndev, name, parent, parent->mp, dev); |
07dfa375 | 1917 | nanotime(&parent->mtime); |
0182b316 | 1918 | |
bc185c5a AH |
1919 | /* |
1920 | * Ugly unix98 pty magic, to hide pty master (ptm) devices and their | |
1921 | * directory | |
1922 | */ | |
1923 | if ((dev) && (strlen(dev->si_name) >= 4) && | |
1924 | (!memcmp(dev->si_name, "ptm/", 4))) { | |
894bbb25 AH |
1925 | node->parent->flags |= DEVFS_HIDDEN; |
1926 | node->flags |= DEVFS_HIDDEN; | |
21864bc5 | 1927 | } |
bc185c5a AH |
1928 | |
1929 | /* | |
1930 | * Ugly pty magic, to tag pty devices as such and hide them if needed. | |
1931 | */ | |
21864bc5 MD |
1932 | if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3))) |
1933 | node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE); | |
1934 | ||
21864bc5 MD |
1935 | if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) { |
1936 | found = 0; | |
1937 | for (i = 0; i < strlen(names); i++) { | |
1938 | if (name[3] == names[i]) { | |
1939 | found = 1; | |
1940 | break; | |
1941 | } | |
1942 | } | |
1943 | if (found) | |
1944 | node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE); | |
1945 | } | |
21864bc5 MD |
1946 | |
1947 | out: | |
da655383 MD |
1948 | kfree(name_buf, M_TEMP); |
1949 | kvasfree(&path); | |
21864bc5 MD |
1950 | return node; |
1951 | } | |
1952 | ||
1953 | /* | |
1954 | * This function finds a given device node in the topology with a given | |
1955 | * cdev. | |
1956 | */ | |
66abefa5 AH |
1957 | void * |
1958 | devfs_find_device_node_callback(struct devfs_node *node, cdev_t target) | |
21864bc5 | 1959 | { |
8e78a293 | 1960 | if ((node->node_type == Ndev) && (node->d_dev == target)) { |
66abefa5 | 1961 | return node; |
21864bc5 | 1962 | } |
21864bc5 MD |
1963 | |
1964 | return NULL; | |
1965 | } | |
1966 | ||
1967 | /* | |
66abefa5 | 1968 | * This function finds a device node in the given parent directory by its |
21864bc5 MD |
1969 | * name and returns it. |
1970 | */ | |
1971 | struct devfs_node * | |
1972 | devfs_find_device_node_by_name(struct devfs_node *parent, char *target) | |
1973 | { | |
1974 | struct devfs_node *node, *found = NULL; | |
1975 | size_t len = strlen(target); | |
1976 | ||
1977 | TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) { | |
bc185c5a AH |
1978 | if (len != node->d_dir.d_namlen) |
1979 | continue; | |
1980 | ||
1981 | if (!memcmp(node->d_dir.d_name, target, len)) { | |
21864bc5 MD |
1982 | found = node; |
1983 | break; | |
1984 | } | |
1985 | } | |
1986 | ||
1987 | return found; | |
1988 | } | |
1989 | ||
66abefa5 AH |
1990 | static void * |
1991 | devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop) | |
fa7e6f37 | 1992 | { |
66abefa5 AH |
1993 | struct vnode *vp = NULL; |
1994 | ino_t target = *inop; | |
bc185c5a | 1995 | |
fa7e6f37 AH |
1996 | if (node->d_dir.d_ino == target) { |
1997 | if (node->v_node) { | |
1998 | vp = node->v_node; | |
1999 | vget(vp, LK_EXCLUSIVE | LK_RETRY); | |
2000 | vn_unlock(vp); | |
2001 | } else { | |
2002 | devfs_allocv(&vp, node); | |
2003 | vn_unlock(vp); | |
2004 | } | |
fa7e6f37 AH |
2005 | } |
2006 | ||
66abefa5 | 2007 | return vp; |
fa7e6f37 AH |
2008 | } |
2009 | ||
21864bc5 | 2010 | /* |
ca8d7677 MD |
2011 | * This function takes a cdev and removes its devfs node in the |
2012 | * given topology. The cdev remains intact. | |
21864bc5 MD |
2013 | */ |
2014 | int | |
2015 | devfs_destroy_device_node(struct devfs_node *root, cdev_t target) | |
8312ca30 AH |
2016 | { |
2017 | KKASSERT(target != NULL); | |
2018 | return devfs_destroy_node(root, target->si_name); | |
2019 | } | |
2020 | ||
2021 | /* | |
2022 | * This function takes a path to a devfs node, resolves it and | |
2023 | * removes the devfs node from the given topology. | |
2024 | */ | |
2025 | int | |
2026 | devfs_destroy_node(struct devfs_node *root, char *target) | |
21864bc5 MD |
2027 | { |
2028 | struct devfs_node *node, *parent; | |
da655383 MD |
2029 | char *name; |
2030 | char *name_buf; | |
21864bc5 MD |
2031 | char *create_path = NULL; |
2032 | ||
2033 | KKASSERT(target); | |
2034 | ||
da655383 | 2035 | name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK); |
8312ca30 | 2036 | ksnprintf(name_buf, PATH_MAX, "%s", target); |
21864bc5 | 2037 | |
8312ca30 | 2038 | devfs_resolve_name_path(target, name_buf, &create_path, &name); |
21864bc5 MD |
2039 | |
2040 | if (create_path) | |
2041 | parent = devfs_resolve_or_create_path(root, create_path, 0); | |
2042 | else | |
2043 | parent = root; | |
bc185c5a | 2044 | |
ab3436e7 MD |
2045 | if (parent == NULL) { |
2046 | kfree(name_buf, M_TEMP); | |
21864bc5 | 2047 | return 1; |
ab3436e7 | 2048 | } |
bc185c5a | 2049 | |
21864bc5 | 2050 | node = devfs_find_device_node_by_name(parent, name); |
bc185c5a | 2051 | |
07dfa375 AH |
2052 | if (node) { |
2053 | nanotime(&node->parent->mtime); | |
21864bc5 | 2054 | devfs_gc(node); |
07dfa375 | 2055 | } |
115f9a72 | 2056 | |
da655383 | 2057 | kfree(name_buf, M_TEMP); |
21864bc5 MD |
2058 | |
2059 | return 0; | |
2060 | } | |
2061 | ||
2062 | /* | |
2063 | * Just set perms and ownership for given node. | |
2064 | */ | |
2065 | int | |
bc185c5a AH |
2066 | devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid, |
2067 | u_short mode, u_long flags) | |
21864bc5 | 2068 | { |
bc185c5a AH |
2069 | node->mode = mode; |
2070 | node->uid = uid; | |
2071 | node->gid = gid; | |
21864bc5 MD |
2072 | |
2073 | return 0; | |
2074 | } | |
2075 | ||
2076 | /* | |
2077 | * Propagates a device attach/detach to all mount | |
2078 | * points. Also takes care of automatic alias removal | |
2079 | * for a deleted cdev. | |
2080 | */ | |
2081 | static int | |
2082 | devfs_propagate_dev(cdev_t dev, int attach) | |
2083 | { | |
2084 | struct devfs_mnt_data *mnt; | |
2085 | ||
21864bc5 | 2086 | TAILQ_FOREACH(mnt, &devfs_mnt_list, link) { |
21864bc5 MD |
2087 | if (attach) { |
2088 | /* Device is being attached */ | |
ca8d7677 MD |
2089 | devfs_create_device_node(mnt->root_node, dev, |
2090 | NULL, NULL ); | |
21864bc5 MD |
2091 | } else { |
2092 | /* Device is being detached */ | |
21864bc5 MD |
2093 | devfs_alias_remove(dev); |
2094 | devfs_destroy_device_node(mnt->root_node, dev); | |
2095 | } | |
2096 | } | |
21864bc5 MD |
2097 | return 0; |
2098 | } | |
2099 | ||
21864bc5 MD |
2100 | /* |
2101 | * devfs_clone either returns a basename from a complete name by | |
2102 | * returning the length of the name without trailing digits, or, | |
2103 | * if clone != 0, calls the device's clone handler to get a new | |
2104 | * device, which in turn is returned in devp. | |
2105 | */ | |
07dfa375 AH |
2106 | cdev_t |
2107 | devfs_clone(cdev_t dev, const char *name, size_t len, int mode, | |
bc185c5a | 2108 | struct ucred *cred) |
21864bc5 | 2109 | { |
07dfa375 | 2110 | int error; |
21864bc5 MD |
2111 | struct devfs_clone_handler *chandler; |
2112 | struct dev_clone_args ap; | |
2113 | ||
d0fe8596 | 2114 | TAILQ_FOREACH(chandler, &devfs_chandler_list, link) { |
07dfa375 AH |
2115 | if (chandler->namlen != len) |
2116 | continue; | |
2117 | if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) { | |
2118 | lockmgr(&devfs_lock, LK_RELEASE); | |
2119 | devfs_config(); | |
2120 | lockmgr(&devfs_lock, LK_EXCLUSIVE); | |
2121 | ||
2122 | ap.a_head.a_dev = dev; | |
2123 | ap.a_dev = NULL; | |
2124 | ap.a_name = name; | |
2125 | ap.a_namelen = len; | |
2126 | ap.a_mode = mode; | |
2127 | ap.a_cred = cred; | |
2128 | error = (chandler->nhandler)(&ap); | |
2129 | if (error) | |
2130 | continue; | |
21864bc5 | 2131 | |
07dfa375 | 2132 | return ap.a_dev; |
21864bc5 MD |
2133 | } |
2134 | } | |
2135 | ||
07dfa375 | 2136 | return NULL; |
21864bc5 MD |
2137 | } |
2138 | ||
2139 | ||
2140 | /* | |
2141 | * Registers a new orphan in the orphan list. | |
2142 | */ | |
2143 | void | |
2144 | devfs_tracer_add_orphan(struct devfs_node *node) | |
2145 | { | |
2146 | struct devfs_orphan *orphan; | |
2147 | ||
2148 | KKASSERT(node); | |
2149 | orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK); | |
2150 | orphan->node = node; | |
2151 | ||
ca8d7677 MD |
2152 | KKASSERT((node->flags & DEVFS_ORPHANED) == 0); |
2153 | node->flags |= DEVFS_ORPHANED; | |
21864bc5 MD |
2154 | TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link); |
2155 | } | |
2156 | ||
2157 | /* | |
2158 | * Removes an orphan from the orphan list. | |
2159 | */ | |
2160 | void | |
2161 | devfs_tracer_del_orphan(struct devfs_node *node) | |
2162 | { | |
2163 | struct devfs_orphan *orphan; | |
2164 | ||
2165 | KKASSERT(node); | |
2166 | ||
2167 | TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) { | |
2168 | if (orphan->node == node) { | |
ca8d7677 | 2169 | node->flags &= ~DEVFS_ORPHANED; |
21864bc5 MD |
2170 | TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link); |
2171 | kfree(orphan, M_DEVFS); | |
2172 | break; | |
2173 | } | |
2174 | } | |
2175 | } | |
2176 | ||
2177 | /* | |
2178 | * Counts the orphans in the orphan list, and if cleanup | |
2179 | * is specified, also frees the orphan and removes it from | |
2180 | * the list. | |
2181 | */ | |
2182 | size_t | |
2183 | devfs_tracer_orphan_count(struct mount *mp, int cleanup) | |
2184 | { | |
2185 | struct devfs_orphan *orphan, *orphan2; | |
2186 | size_t count = 0; | |
2187 | ||
2188 | TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) { | |
2189 | count++; | |
bc185c5a AH |
2190 | /* |
2191 | * If we are instructed to clean up, we do so. | |
2192 | */ | |
21864bc5 | 2193 | if (cleanup) { |
21864bc5 | 2194 | TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link); |
ca8d7677 MD |
2195 | orphan->node->flags &= ~DEVFS_ORPHANED; |
2196 | devfs_freep(orphan->node); | |
21864bc5 MD |
2197 | kfree(orphan, M_DEVFS); |
2198 | } | |
2199 | } | |
2200 | ||
2201 | return count; | |
2202 | } | |
2203 | ||
2204 | /* | |
2205 | * Fetch an ino_t from the global d_ino by increasing it | |
2206 | * while spinlocked. | |
2207 | */ | |
2208 | static ino_t | |
2209 | devfs_fetch_ino(void) | |
2210 | { | |
2211 | ino_t ret; | |
2212 | ||
287a8577 | 2213 | spin_lock(&ino_lock); |
21864bc5 | 2214 | ret = d_ino++; |
287a8577 | 2215 | spin_unlock(&ino_lock); |
21864bc5 MD |
2216 | |
2217 | return ret; | |
2218 | } | |
2219 | ||
2220 | /* | |
2221 | * Allocates a new cdev and initializes it's most basic | |
2222 | * fields. | |
2223 | */ | |
2224 | cdev_t | |
8f960aa9 | 2225 | devfs_new_cdev(struct dev_ops *ops, int minor, struct dev_ops *bops) |
21864bc5 | 2226 | { |
21864bc5 | 2227 | cdev_t dev = sysref_alloc(&cdev_sysref_class); |
da655383 | 2228 | |
21864bc5 MD |
2229 | sysref_activate(&dev->si_sysref); |
2230 | reference_dev(dev); | |
da655383 | 2231 | bzero(dev, offsetof(struct cdev, si_sysref)); |
21864bc5 MD |
2232 | |
2233 | dev->si_uid = 0; | |
2234 | dev->si_gid = 0; | |
2235 | dev->si_perms = 0; | |
2236 | dev->si_drv1 = NULL; | |
2237 | dev->si_drv2 = NULL; | |
2238 | dev->si_lastread = 0; /* time_second */ | |
2239 | dev->si_lastwrite = 0; /* time_second */ | |
2240 | ||
f5d8307c | 2241 | dev->si_dict = NULL; |
72ea429e | 2242 | dev->si_parent = NULL; |
21864bc5 | 2243 | dev->si_ops = ops; |
894bbb25 | 2244 | dev->si_flags = 0; |
21864bc5 | 2245 | dev->si_uminor = minor; |
8f960aa9 | 2246 | dev->si_bops = bops; |
bf390b25 AH |
2247 | |
2248 | /* | |
2249 | * Since the disk subsystem is in the way, we need to | |
2250 | * propagate the D_CANFREE from bops (and ops) to | |
2251 | * si_flags. | |
2252 | */ | |
2253 | if (bops && (bops->head.flags & D_CANFREE)) { | |
2254 | dev->si_flags |= SI_CANFREE; | |
2255 | } else if (ops->head.flags & D_CANFREE) { | |
2256 | dev->si_flags |= SI_CANFREE; | |
2257 | } | |
2258 | ||
47ae500f | 2259 | /* If there is a backing device, we reference its ops */ |
d9f8f778 SW |
2260 | dev->si_inode = makeudev( |
2261 | devfs_reference_ops((bops)?(bops):(ops)), | |
2262 | minor ); | |
619e8f47 | 2263 | dev->si_umajor = umajor(dev->si_inode); |
21864bc5 MD |
2264 | |
2265 | return dev; | |
2266 | } | |
2267 | ||
ca8d7677 MD |
2268 | static void |
2269 | devfs_cdev_terminate(cdev_t dev) | |
21864bc5 MD |
2270 | { |
2271 | int locked = 0; | |
2272 | ||
2273 | /* Check if it is locked already. if not, we acquire the devfs lock */ | |
2274 | if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) { | |
2275 | lockmgr(&devfs_lock, LK_EXCLUSIVE); | |
2276 | locked = 1; | |
2277 | } | |
2278 | ||
e4ff5ef9 AH |
2279 | /* |
2280 | * Make sure the node isn't linked anymore. Otherwise we've screwed | |
2281 | * up somewhere, since normal devs are unlinked on the call to | |
2282 | * destroy_dev and only-cdevs that have not been used for cloning | |
2283 | * are not linked in the first place. only-cdevs used for cloning | |
2284 | * will be linked in, too, and should only be destroyed via | |
2285 | * destroy_dev, not destroy_only_dev, so we catch that problem, too. | |
2286 | */ | |
2287 | KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0); | |
21864bc5 MD |
2288 | |
2289 | /* If we acquired the lock, we also get rid of it */ | |
2290 | if (locked) | |
2291 | lockmgr(&devfs_lock, LK_RELEASE); | |
2292 | ||
47ae500f | 2293 | /* If there is a backing device, we release the backing device's ops */ |
8f960aa9 | 2294 | devfs_release_ops((dev->si_bops)?(dev->si_bops):(dev->si_ops)); |
7cbab9da | 2295 | |
21864bc5 MD |
2296 | /* Finally destroy the device */ |
2297 | sysref_put(&dev->si_sysref); | |
2298 | } | |
2299 | ||
e654922c MD |
2300 | /* |
2301 | * Dummies for now (individual locks for MPSAFE) | |
2302 | */ | |
2303 | static void | |
2304 | devfs_cdev_lock(cdev_t dev) | |
2305 | { | |
2306 | } | |
2307 | ||
2308 | static void | |
2309 | devfs_cdev_unlock(cdev_t dev) | |
2310 | { | |
2311 | } | |
2312 | ||
3bd9e88a SG |
2313 | static int |
2314 | devfs_detached_filter_eof(struct knote *kn, long hint) | |
2315 | { | |
3bcb6e5e | 2316 | kn->kn_flags |= (EV_EOF | EV_NODATA); |
3bd9e88a SG |
2317 | return (1); |
2318 | } | |
2319 | ||
2320 | static void | |
2321 | devfs_detached_filter_detach(struct knote *kn) | |
2322 | { | |
2323 | cdev_t dev = (cdev_t)kn->kn_hook; | |
2324 | ||
2325 | knote_remove(&dev->si_kqinfo.ki_note, kn); | |
2326 | } | |
2327 | ||
2328 | static struct filterops devfs_detached_filterops = | |
2329 | { FILTEROP_ISFD, NULL, | |
2330 | devfs_detached_filter_detach, | |
2331 | devfs_detached_filter_eof }; | |
2332 | ||
2333 | /* | |
2334 | * Delegates knote filter handling responsibility to devfs | |
2335 | * | |
2336 | * Any device that implements kqfilter event handling and could be detached | |
2337 | * or shut down out from under the kevent subsystem must allow devfs to | |
2338 | * assume responsibility for any knotes it may hold. | |
2339 | */ | |
2340 | void | |
2341 | devfs_assume_knotes(cdev_t dev, struct kqinfo *kqi) | |
2342 | { | |
377c3461 MD |
2343 | /* |
2344 | * Let kern/kern_event.c do the heavy lifting. | |
2345 | */ | |
2346 | knote_assume_knotes(kqi, &dev->si_kqinfo, | |
2347 | &devfs_detached_filterops, (void *)dev); | |
3bd9e88a SG |
2348 | |
2349 | /* | |
2350 | * These should probably be activated individually, but doing so | |
2351 | * would require refactoring kq's public in-kernel interface. | |
2352 | */ | |
2353 | KNOTE(&dev->si_kqinfo.ki_note, 0); | |
3bd9e88a SG |
2354 | } |
2355 | ||
21864bc5 MD |
2356 | /* |
2357 | * Links a given cdev into the dev list. | |
2358 | */ | |
2359 | int | |
2360 | devfs_link_dev(cdev_t dev) | |
2361 | { | |
ca8d7677 | 2362 | KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0); |
21864bc5 MD |
2363 | dev->si_flags |= SI_DEVFS_LINKED; |
2364 | TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link); | |
2365 | ||
2366 | return 0; | |
2367 | } | |
2368 | ||
2369 | /* | |
ca8d7677 MD |
2370 | * Removes a given cdev from the dev list. The caller is responsible for |
2371 | * releasing the reference on the device associated with the linkage. | |
2372 | * | |
2373 | * Returns EALREADY if the dev has already been unlinked. | |
21864bc5 | 2374 | */ |
ca8d7677 | 2375 | static int |
21864bc5 MD |
2376 | devfs_unlink_dev(cdev_t dev) |
2377 | { | |
2378 | if ((dev->si_flags & SI_DEVFS_LINKED)) { | |
2379 | TAILQ_REMOVE(&devfs_dev_list, dev, link); | |
2380 | dev->si_flags &= ~SI_DEVFS_LINKED; | |
ca8d7677 | 2381 | return (0); |
21864bc5 | 2382 | } |
ca8d7677 | 2383 | return (EALREADY); |
21864bc5 MD |
2384 | } |
2385 | ||
894bbb25 AH |
2386 | int |
2387 | devfs_node_is_accessible(struct devfs_node *node) | |
2388 | { | |
2389 | if ((node) && (!(node->flags & DEVFS_HIDDEN))) | |
2390 | return 1; | |
2391 | else | |
2392 | return 0; | |
2393 | } | |
2394 | ||
7cbab9da AH |
2395 | int |
2396 | devfs_reference_ops(struct dev_ops *ops) | |
2397 | { | |
2398 | int unit; | |
176de024 AH |
2399 | struct devfs_dev_ops *found = NULL; |
2400 | struct devfs_dev_ops *devops; | |
7cbab9da | 2401 | |
176de024 AH |
2402 | TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) { |
2403 | if (devops->ops == ops) { | |
2404 | found = devops; | |
2405 | break; | |
2406 | } | |
2407 | } | |
2408 | ||
2409 | if (!found) { | |
2410 | found = kmalloc(sizeof(struct devfs_dev_ops), M_DEVFS, M_WAITOK); | |
2411 | found->ops = ops; | |
2412 | found->ref_count = 0; | |
2413 | TAILQ_INSERT_TAIL(&devfs_dev_ops_list, found, link); | |
2414 | } | |
2415 | ||
2416 | KKASSERT(found); | |
2417 | ||
2418 | if (found->ref_count == 0) { | |
2419 | found->id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255); | |
2420 | if (found->id == -1) { | |
7cbab9da | 2421 | /* Ran out of unique ids */ |
bc185c5a AH |
2422 | devfs_debug(DEVFS_DEBUG_WARNING, |
2423 | "devfs_reference_ops: WARNING: ran out of unique ids\n"); | |
7cbab9da AH |
2424 | } |
2425 | } | |
176de024 AH |
2426 | unit = found->id; |
2427 | ++found->ref_count; | |
7cbab9da AH |
2428 | |
2429 | return unit; | |
2430 | } | |
2431 | ||
2432 | void | |
2433 | devfs_release_ops(struct dev_ops *ops) | |
2434 | { | |
176de024 AH |
2435 | struct devfs_dev_ops *found = NULL; |
2436 | struct devfs_dev_ops *devops; | |
2437 | ||
2438 | TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) { | |
2439 | if (devops->ops == ops) { | |
2440 | found = devops; | |
2441 | break; | |
2442 | } | |
2443 | } | |
2444 | ||
2445 | KKASSERT(found); | |
2446 | ||
2447 | --found->ref_count; | |
7cbab9da | 2448 | |
176de024 AH |
2449 | if (found->ref_count == 0) { |
2450 | TAILQ_REMOVE(&devfs_dev_ops_list, found, link); | |
2451 | devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), found->id); | |
2452 | kfree(found, M_DEVFS); | |
7cbab9da AH |
2453 | } |
2454 | } | |
2455 | ||
a4141af4 MD |
2456 | /* |
2457 | * Wait for asynchronous messages to complete in the devfs helper | |
2458 | * thread, then return. Do nothing if the helper thread is dead | |
1c375cd1 | 2459 | * or we are being indirectly called from the helper thread itself. |
a4141af4 | 2460 | */ |
21864bc5 | 2461 | void |
d0fe8596 | 2462 | devfs_config(void) |
21864bc5 MD |
2463 | { |
2464 | devfs_msg_t msg; | |
2465 | ||
1c375cd1 | 2466 | if (devfs_run && curthread != td_core) { |
a4141af4 MD |
2467 | msg = devfs_msg_get(); |
2468 | msg = devfs_msg_send_sync(DEVFS_SYNC, msg); | |
2469 | devfs_msg_put(msg); | |
2470 | } | |
21864bc5 MD |
2471 | } |
2472 | ||
2473 | /* | |
2474 | * Called on init of devfs; creates the objcaches and | |
2475 | * spawns off the devfs core thread. Also initializes | |
2476 | * locks. | |
2477 | */ | |
2478 | static void | |
2479 | devfs_init(void) | |
2480 | { | |
2481 | devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n"); | |
2482 | /* Create objcaches for nodes, msgs and devs */ | |
d0fe8596 MD |
2483 | devfs_node_cache = objcache_create("devfs-node-cache", 0, 0, |
2484 | NULL, NULL, NULL, | |
2485 | objcache_malloc_alloc, | |
2486 | objcache_malloc_free, | |
2487 | &devfs_node_malloc_args ); | |
2488 | ||
2489 | devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0, | |
2490 | NULL, NULL, NULL, | |
2491 | objcache_malloc_alloc, | |
2492 | objcache_malloc_free, | |
2493 | &devfs_msg_malloc_args ); | |
2494 | ||
2495 | devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0, | |
2496 | NULL, NULL, NULL, | |
2497 | objcache_malloc_alloc, | |
2498 | objcache_malloc_free, | |
2499 | &devfs_dev_malloc_args ); | |
21864bc5 | 2500 | |
7cbab9da | 2501 | devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id)); |
7cbab9da | 2502 | |
21864bc5 MD |
2503 | /* Initialize the reply-only port which acts as a message drain */ |
2504 | lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply); | |
2505 | ||
2506 | /* Initialize *THE* devfs lock */ | |
2507 | lockinit(&devfs_lock, "devfs_core lock", 0, 0); | |
2508 | ||
c9e9fb21 | 2509 | lockmgr(&devfs_lock, LK_EXCLUSIVE); |
21864bc5 | 2510 | lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL, |
d2d8515b | 2511 | 0, -1, "devfs_msg_core"); |
1c375cd1 | 2512 | while (devfs_run == 0) |
c9e9fb21 MD |
2513 | lksleep(td_core, &devfs_lock, 0, "devfsc", 0); |
2514 | lockmgr(&devfs_lock, LK_RELEASE); | |
21864bc5 MD |
2515 | |
2516 | devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n"); | |
2517 | } | |
2518 | ||
2519 | /* | |
2520 | * Called on unload of devfs; takes care of destroying the core | |
2521 | * and the objcaches. Also removes aliases that are no longer needed. | |
2522 | */ | |
2523 | static void | |
2524 | devfs_uninit(void) | |
2525 | { | |
2526 | devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n"); | |
2527 | ||
2528 | devfs_msg_send(DEVFS_TERMINATE_CORE, NULL); | |
1c375cd1 MD |
2529 | while (devfs_run) |
2530 | tsleep(td_core, 0, "devfsc", hz*10); | |
2531 | tsleep(td_core, 0, "devfsc", hz); | |
21864bc5 | 2532 | |
7cbab9da AH |
2533 | devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id)); |
2534 | ||
21864bc5 MD |
2535 | /* Destroy the objcaches */ |
2536 | objcache_destroy(devfs_msg_cache); | |
2537 | objcache_destroy(devfs_node_cache); | |
2538 | objcache_destroy(devfs_dev_cache); | |
2539 | ||
2540 | devfs_alias_reap(); | |
2541 | } | |
2542 | ||
2543 | /* | |
2544 | * This is a sysctl handler to assist userland devname(3) to | |
2545 | * find the device name for a given udev. | |
2546 | */ | |
2547 | static int | |
2548 | devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS) | |
2549 | { | |
2550 | udev_t udev; | |
2551 | cdev_t found; | |
2552 | int error; | |
2553 | ||
2554 | ||
2555 | if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t)))) | |
2556 | return (error); | |
2557 | ||
2558 | devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev); | |
2559 | ||
2560 | if (udev == NOUDEV) | |
2561 | return(EINVAL); | |
2562 | ||
2563 | if ((found = devfs_find_device_by_udev(udev)) == NULL) | |
2564 | return(ENOENT); | |
2565 | ||
2566 | return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1)); | |
2567 | } | |
2568 | ||
2569 | ||
2570 | SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY, | |
2571 | NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)"); | |
2572 | ||
3a1032a6 | 2573 | SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs"); |
21864bc5 | 2574 | TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable); |
bc185c5a AH |
2575 | SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable, |
2576 | 0, "Enable DevFS debugging"); | |
21864bc5 | 2577 | |
bc185c5a AH |
2578 | SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, |
2579 | devfs_init, NULL); | |
2580 | SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, | |
2581 | devfs_uninit, NULL); | |
8312ca30 AH |
2582 | |
2583 | /* | |
2584 | * WildCmp() - compare wild string to sane string | |
2585 | * | |
2586 | * Returns 0 on success, -1 on failure. | |
2587 | */ | |
2588 | static int | |
2589 | wildCmp(const char **mary, int d, const char *w, const char *s) | |
2590 | { | |
2591 | int i; | |
2592 | ||
2593 | /* | |
2594 | * skip fixed portion | |
2595 | */ | |
2596 | for (;;) { | |
2597 | switch(*w) { | |
2598 | case '*': | |
2599 | /* | |
2600 | * optimize terminator | |
2601 | */ | |
2602 | if (w[1] == 0) | |
2603 | return(0); | |
2604 | if (w[1] != '?' && w[1] != '*') { | |
2605 | /* | |
2606 | * optimize * followed by non-wild | |
2607 | */ | |
2608 | for (i = 0; s + i < mary[d]; ++i) { | |
2609 | if (s[i] == w[1] && wildCmp(mary, d + 1, w + 1, s + i) == 0) | |
2610 | return(0); | |
2611 | } | |
2612 | } else { | |
2613 | /* | |
2614 | * less-optimal | |
2615 | */ | |
2616 | for (i = 0; s + i < mary[d]; ++i) { | |
2617 | if (wildCmp(mary, d + 1, w + 1, s + i) == 0) | |
2618 | return(0); | |
2619 | } | |
2620 | } | |
2621 | mary[d] = s; | |
2622 | return(-1); | |
2623 | case '?': | |
2624 | if (*s == 0) | |
2625 | return(-1); | |
2626 | ++w; | |
2627 | ++s; | |
2628 | break; | |
2629 | default: | |
2630 | if (*w != *s) | |
2631 | return(-1); | |
2632 | if (*w == 0) /* terminator */ | |
2633 | return(0); | |
2634 | ++w; | |
2635 | ++s; | |
2636 | break; | |
2637 | } | |
2638 | } | |
2639 | /* not reached */ | |
2640 | return(-1); | |
2641 | } | |
2642 | ||
2643 | ||
2644 | /* | |
2645 | * WildCaseCmp() - compare wild string to sane string, case insensitive | |
2646 | * | |
2647 | * Returns 0 on success, -1 on failure. | |
2648 | */ | |
2649 | static int | |
2650 | wildCaseCmp(const char **mary, int d, const char *w, const char *s) | |
2651 | { | |
2652 | int i; | |
2653 | ||
2654 | /* | |
2655 | * skip fixed portion | |
2656 | */ | |
2657 | for (;;) { | |
2658 | switch(*w) { | |
2659 | case '*': | |
2660 | /* | |
2661 | * optimize terminator | |
2662 | */ | |
2663 | if (w[1] == 0) | |
2664 | return(0); | |
2665 | if (w[1] != '?' && w[1] != '*') { | |
2666 | /* | |
2667 | * optimize * followed by non-wild | |
2668 | */ | |
2669 | for (i = 0; s + i < mary[d]; ++i) { | |
2670 | if (s[i] == w[1] && wildCaseCmp(mary, d + 1, w + 1, s + i) == 0) | |
2671 | return(0); | |
2672 | } | |
2673 | } else { | |
2674 | /* | |
2675 | * less-optimal | |
2676 | */ | |
2677 | for (i = 0; s + i < mary[d]; ++i) { | |
2678 | if (wildCaseCmp(mary, d + 1, w + 1, s + i) == 0) | |
2679 | return(0); | |
2680 | } | |
2681 | } | |
2682 | mary[d] = s; | |
2683 | return(-1); | |
2684 | case '?': | |
2685 | if (*s == 0) | |
2686 | return(-1); | |
2687 | ++w; | |
2688 | ++s; | |
2689 | break; | |
2690 | default: | |
2691 | if (*w != *s) { | |
2692 | #define tolower(x) ((x >= 'A' && x <= 'Z')?(x+('a'-'A')):(x)) | |
2693 | if (tolower(*w) != tolower(*s)) | |
2694 | return(-1); | |
2695 | } | |
2696 | if (*w == 0) /* terminator */ | |
2697 | return(0); | |
2698 | ++w; | |
2699 | ++s; | |
2700 | break; | |
2701 | } | |
2702 | } | |
2703 | /* not reached */ | |
2704 | return(-1); | |
2705 | } | |
2706 | ||
2707 | int | |
2708 | devfs_WildCmp(const char *w, const char *s) | |
2709 | { | |
2710 | int i; | |
2711 | int c; | |
2712 | int slen = strlen(s); | |
2713 | const char **mary; | |
2714 | ||
2715 | for (i = c = 0; w[i]; ++i) { | |
2716 | if (w[i] == '*') | |
2717 | ++c; | |
2718 | } | |
2719 | mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK); | |
2720 | for (i = 0; i < c; ++i) | |
2721 | mary[i] = s + slen; | |
2722 | i = wildCmp(mary, 0, w, s); | |
2723 | kfree(mary, M_DEVFS); | |
2724 | return(i); | |
2725 | } | |
2726 | ||
2727 | int | |
2728 | devfs_WildCaseCmp(const char *w, const char *s) | |
2729 | { | |
2730 | int i; | |
2731 | int c; | |
2732 | int slen = strlen(s); | |
2733 | const char **mary; | |
2734 | ||
2735 | for (i = c = 0; w[i]; ++i) { | |
2736 | if (w[i] == '*') | |
2737 | ++c; | |
2738 | } | |
2739 | mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK); | |
2740 | for (i = 0; i < c; ++i) | |
2741 | mary[i] = s + slen; | |
2742 | i = wildCaseCmp(mary, 0, w, s); | |
2743 | kfree(mary, M_DEVFS); | |
2744 | return(i); | |
2745 | } | |
2746 |