2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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
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>
41 #include <sys/msgport.h>
42 #include <sys/sysctl.h>
43 #include <sys/ucred.h>
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/devfs.h>
47 #include <sys/devfs_rules.h>
50 #include <sys/msgport2.h>
51 #include <sys/spinlock2.h>
52 #include <sys/mplock2.h>
53 #include <sys/sysref2.h>
55 MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations");
56 DEVFS_DECLARE_CLONE_BITMAP(ops_id);
58 * SYSREF Integration - reference counting, allocation,
59 * sysid and syslink integration.
61 static void devfs_cdev_terminate(cdev_t dev);
62 static void devfs_cdev_lock(cdev_t dev);
63 static void devfs_cdev_unlock(cdev_t dev);
64 static struct sysref_class cdev_sysref_class = {
67 .proto = SYSREF_PROTO_DEV,
68 .offset = offsetof(struct cdev, si_sysref),
69 .objsize = sizeof(struct cdev),
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
79 static struct objcache *devfs_node_cache;
80 static struct objcache *devfs_msg_cache;
81 static struct objcache *devfs_dev_cache;
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 };
90 static struct devfs_dev_head devfs_dev_list =
91 TAILQ_HEAD_INITIALIZER(devfs_dev_list);
92 static struct devfs_mnt_head devfs_mnt_list =
93 TAILQ_HEAD_INITIALIZER(devfs_mnt_list);
94 static struct devfs_chandler_head devfs_chandler_list =
95 TAILQ_HEAD_INITIALIZER(devfs_chandler_list);
96 static struct devfs_alias_head devfs_alias_list =
97 TAILQ_HEAD_INITIALIZER(devfs_alias_list);
98 static struct devfs_dev_ops_head devfs_dev_ops_list =
99 TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list);
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;
106 static struct spinlock ino_lock;
108 static int devfs_debug_enable;
109 static int devfs_run;
111 static ino_t devfs_fetch_ino(void);
112 static int devfs_create_all_dev_worker(struct devfs_node *);
113 static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int);
114 static int devfs_destroy_dev_worker(cdev_t);
115 static int devfs_destroy_related_worker(cdev_t);
116 static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int);
117 static int devfs_propagate_dev(cdev_t, int);
118 static int devfs_unlink_dev(cdev_t dev);
119 static void devfs_msg_exec(devfs_msg_t msg);
121 static int devfs_chandler_add_worker(const char *, d_clone_t *);
122 static int devfs_chandler_del_worker(const char *);
124 static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
125 static void devfs_msg_core(void *);
127 static int devfs_find_device_by_name_worker(devfs_msg_t);
128 static int devfs_find_device_by_udev_worker(devfs_msg_t);
130 static int devfs_apply_reset_rules_caller(char *, int);
132 static int devfs_scan_callback_worker(devfs_scan_t *, void *);
134 static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *,
135 char *, size_t, int);
137 static int devfs_make_alias_worker(struct devfs_alias *);
138 static int devfs_destroy_alias_worker(struct devfs_alias *);
139 static int devfs_alias_remove(cdev_t);
140 static int devfs_alias_reap(void);
141 static int devfs_alias_propagate(struct devfs_alias *, int);
142 static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *);
143 static int devfs_alias_check_create(struct devfs_node *);
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);
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 *);
152 devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *);
155 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function
159 devfs_debug(int level, char *fmt, ...)
164 if (level <= devfs_debug_enable)
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
178 devfs_allocp(devfs_nodetype devfsnodetype, char *name,
179 struct devfs_node *parent, struct mount *mp, cdev_t dev)
181 struct devfs_node *node = NULL;
182 size_t namlen = strlen(name);
184 node = objcache_get(devfs_node_cache, M_WAITOK);
185 bzero(node, sizeof(*node));
187 atomic_add_long(&DEVFS_MNTDATA(mp)->leak_count, 1);
192 node->d_dir.d_ino = devfs_fetch_ino();
195 * Cookie jar for children. Leave 0 and 1 for '.' and '..' entries
198 node->cookie_jar = 2;
201 * Access Control members
203 node->mode = DEVFS_DEFAULT_MODE;
204 node->uid = DEVFS_DEFAULT_UID;
205 node->gid = DEVFS_DEFAULT_GID;
207 switch (devfsnodetype) {
210 * Ensure that we don't recycle the root vnode by marking it as
211 * linked into the topology.
213 node->flags |= DEVFS_NODE_LINKED;
215 TAILQ_INIT(DEVFS_DENODE_HEAD(node));
216 node->d_dir.d_type = DT_DIR;
221 node->d_dir.d_type = DT_LNK;
225 node->d_dir.d_type = DT_REG;
230 node->d_dir.d_type = DT_CHR;
233 node->mode = dev->si_perms;
234 node->uid = dev->si_uid;
235 node->gid = dev->si_gid;
237 devfs_alias_check_create(node);
242 panic("devfs_allocp: unknown node type");
246 node->node_type = devfsnodetype;
248 /* Initialize the dirent structure of each devfs vnode */
249 node->d_dir.d_namlen = namlen;
250 node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK);
251 memcpy(node->d_dir.d_name, name, namlen);
252 node->d_dir.d_name[namlen] = '\0';
254 /* Initialize the parent node element */
255 node->parent = parent;
257 /* Initialize *time members */
258 nanotime(&node->atime);
259 node->mtime = node->ctime = node->atime;
262 * Associate with parent as last step, clean out namecache
265 if ((parent != NULL) &&
266 ((parent->node_type == Nroot) || (parent->node_type == Ndir))) {
268 node->cookie = parent->cookie_jar++;
269 node->flags |= DEVFS_NODE_LINKED;
270 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link);
272 /* This forces negative namecache lookups to clear */
273 ++mp->mnt_namecache_gen;
277 devfs_rule_check_apply(node, NULL);
279 atomic_add_long(&DEVFS_MNTDATA(mp)->file_count, 1);
285 * devfs_allocv() allocates a new vnode based on a devfs node.
288 devfs_allocv(struct vnode **vpp, struct devfs_node *node)
296 while ((vp = node->v_node) != NULL) {
297 error = vget(vp, LK_EXCLUSIVE);
302 if (error != ENOENT) {
308 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0)
313 if (node->v_node != NULL) {
322 switch (node->node_type) {
324 vsetflags(vp, VROOT);
340 KKASSERT(node->d_dev);
342 vp->v_uminor = node->d_dev->si_uminor;
345 v_associate_rdev(vp, node->d_dev);
346 vp->v_ops = &node->mp->mnt_vn_spec_ops;
350 panic("devfs_allocv: unknown node type");
358 * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode
359 * based on the newly created devfs node.
362 devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype,
363 char *name, struct devfs_node *parent, cdev_t dev)
365 struct devfs_node *node;
367 node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
370 devfs_allocv(vpp, node);
378 * Destroy the devfs_node. The node must be unlinked from the topology.
380 * This function will also destroy any vnode association with the node
383 * The cdev_t itself remains intact.
385 * The core lock is not necessarily held on call and must be temporarily
386 * released if it is to avoid a deadlock.
389 devfs_freep(struct devfs_node *node)
395 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) ||
396 (node->node_type == Nroot));
399 * Protect against double frees
401 KKASSERT((node->flags & DEVFS_DESTROYED) == 0);
402 node->flags |= DEVFS_DESTROYED;
405 * Avoid deadlocks between devfs_lock and the vnode lock when
406 * disassociating the vnode (stress2 pty vs ls -la /dev/pts).
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.
412 if (lockstatus(&devfs_lock, curthread) == LK_EXCLUSIVE) {
413 lockmgr(&devfs_lock, LK_RELEASE);
419 while ((vp = node->v_node) != NULL) {
420 if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0)
425 cache_inval_vp(vp, CINV_DESTROY);
432 atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->leak_count, 1);
433 if (node->symlink_name) {
434 kfree(node->symlink_name, M_DEVFS);
435 node->symlink_name = NULL;
439 * Remove the node from the orphan list if it is still on it.
441 if (node->flags & DEVFS_ORPHANED)
442 devfs_tracer_del_orphan(node);
444 if (node->d_dir.d_name) {
445 kfree(node->d_dir.d_name, M_DEVFS);
446 node->d_dir.d_name = NULL;
448 atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->file_count, 1);
449 objcache_put(devfs_node_cache, node);
452 lockmgr(&devfs_lock, LK_EXCLUSIVE);
458 * Unlink the devfs node from the topology and add it to the orphan list.
459 * The node will later be destroyed by freep.
461 * Any vnode association, including the v_rdev and v_data, remains intact
465 devfs_unlinkp(struct devfs_node *node)
467 struct devfs_node *parent;
471 * Add the node to the orphan list, so it is referenced somewhere, to
472 * so we don't leak it.
474 devfs_tracer_add_orphan(node);
476 parent = node->parent;
479 * If the parent is known we can unlink the node out of the topology
482 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
484 node->flags &= ~DEVFS_NODE_LINKED;
492 devfs_iterate_topology(struct devfs_node *node,
493 devfs_iterate_callback_t *callback, void *arg1)
495 struct devfs_node *node1, *node2;
498 if ((node->node_type == Nroot) || (node->node_type == Ndir)) {
499 if (node->nchildren > 2) {
500 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node),
502 if ((ret = devfs_iterate_topology(node1, callback, arg1)))
508 ret = callback(node, arg1);
513 * devfs_reaperp() is a recursive function that iterates through all the
514 * topology, unlinking and freeing all devfs nodes.
517 devfs_reaperp_callback(struct devfs_node *node, void *unused)
526 devfs_gc_dirs_callback(struct devfs_node *node, void *unused)
528 if (node->node_type == Ndir) {
529 if ((node->nchildren == 2) &&
530 !(node->flags & DEVFS_USER_CREATED)) {
540 devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target)
542 if ((node->node_type == Nlink) && (node->link_target == target)) {
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.
556 devfs_gc(struct devfs_node *node)
558 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
560 if (node->nlinks > 0)
561 devfs_iterate_topology(root_node,
562 (devfs_iterate_callback_t *)devfs_gc_links_callback, node);
565 devfs_iterate_topology(root_node,
566 (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL);
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.
577 * This function will reference the passed device. The reference is owned
578 * by devfs and represents all of the device's node associations.
581 devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
584 devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
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.
594 devfs_destroy_dev(cdev_t dev)
596 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
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
606 devfs_mount_add(struct devfs_mnt_data *mnt)
610 msg = devfs_msg_get();
612 msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg);
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.
623 devfs_mount_del(struct devfs_mnt_data *mnt)
627 msg = devfs_msg_get();
629 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
636 * devfs_destroy_related() is the synchronous entry point for device
637 * destruction by subname. It just sends a message with the relevant details to
641 devfs_destroy_related(cdev_t dev)
645 msg = devfs_msg_get();
647 msg = devfs_msg_send_sync(DEVFS_DESTROY_RELATED, msg);
653 devfs_clr_related_flag(cdev_t dev, uint32_t flag)
657 msg = devfs_msg_get();
658 msg->mdv_flags.dev = dev;
659 msg->mdv_flags.flag = flag;
660 msg = devfs_msg_send_sync(DEVFS_CLR_RELATED_FLAG, msg);
667 devfs_destroy_related_without_flag(cdev_t dev, uint32_t flag)
671 msg = devfs_msg_get();
672 msg->mdv_flags.dev = dev;
673 msg->mdv_flags.flag = flag;
674 msg = devfs_msg_send_sync(DEVFS_DESTROY_RELATED_WO_FLAG, msg);
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
686 devfs_create_all_dev(struct devfs_node *root)
688 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
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.
698 devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor)
700 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor);
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
710 devfs_clone_handler_add(const char *name, d_clone_t *nhandler)
714 msg = devfs_msg_get();
715 msg->mdv_chandler.name = name;
716 msg->mdv_chandler.nhandler = nhandler;
717 msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg);
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
728 devfs_clone_handler_del(const char *name)
732 msg = devfs_msg_get();
733 msg->mdv_chandler.name = name;
734 msg->mdv_chandler.nhandler = NULL;
735 msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg);
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.
746 devfs_find_device_by_name(const char *fmt, ...)
757 kvasnrprintf(&target, PATH_MAX, 10, fmt, ap);
760 msg = devfs_msg_get();
761 msg->mdv_name = target;
762 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
763 found = msg->mdv_cdev;
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.
776 devfs_find_device_by_udev(udev_t udev)
781 msg = devfs_msg_get();
782 msg->mdv_udev = udev;
783 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
784 found = msg->mdv_cdev;
787 devfs_debug(DEVFS_DEBUG_DEBUG,
788 "devfs_find_device_by_udev found? %s -end:3-\n",
789 ((found) ? found->si_name:"NO"));
794 devfs_inode_to_vnode(struct mount *mp, ino_t target)
796 struct vnode *vp = NULL;
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);
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
819 devfs_make_alias(const char *name, cdev_t dev_target)
821 struct devfs_alias *alias;
826 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
827 alias->name = kstrdup(name, M_DEVFS);
829 alias->dev_target = dev_target;
831 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
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
841 devfs_destroy_alias(const char *name, cdev_t dev_target)
843 struct devfs_alias *alias;
848 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
849 alias->name = kstrdup(name, M_DEVFS);
851 alias->dev_target = dev_target;
853 devfs_msg_send_generic(DEVFS_DESTROY_ALIAS, alias);
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
863 devfs_apply_rules(char *mntto)
867 new_name = kstrdup(mntto, M_DEVFS);
868 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
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.
878 devfs_reset_rules(char *mntto)
882 new_name = kstrdup(mntto, M_DEVFS);
883 devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
890 * devfs_scan_callback is the asynchronous entry point to call a callback
892 * It just sends a message with the relevant details to the devfs core.
895 devfs_scan_callback(devfs_scan_t *callback, void *arg)
901 msg = devfs_msg_get();
902 msg->mdv_load = callback;
903 msg->mdv_load2 = arg;
904 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
912 * Acts as a message drain. Any message that is replied to here gets destroyed
913 * and the memory freed.
916 devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
918 devfs_msg_put((devfs_msg_t)msg);
922 * devfs_msg_get allocates a new devfs msg and returns it.
927 return objcache_get(devfs_msg_cache, M_WAITOK);
931 * devfs_msg_put deallocates a given devfs msg.
934 devfs_msg_put(devfs_msg_t msg)
936 objcache_put(devfs_msg_cache, msg);
941 * devfs_msg_send is the generic asynchronous message sending facility
942 * for devfs. By default the reply port is the automatic disposal port.
944 * If the current thread is the devfs_msg_port thread we execute the
945 * operation synchronously.
948 devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
950 lwkt_port_t port = &devfs_msg_port;
952 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
954 devfs_msg->hdr.u.ms_result = cmd;
956 if (port->mpu_td == curthread) {
957 devfs_msg_exec(devfs_msg);
958 lwkt_replymsg(&devfs_msg->hdr, 0);
960 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
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.
970 devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg)
972 struct lwkt_port rep_port;
973 devfs_msg_t msg_incoming;
974 lwkt_port_t port = &devfs_msg_port;
976 lwkt_initport_thread(&rep_port, curthread);
977 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
979 devfs_msg->hdr.u.ms_result = cmd;
981 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
982 msg_incoming = lwkt_waitport(&rep_port, 0);
988 * sends a message with a generic argument.
991 devfs_msg_send_generic(uint32_t cmd, void *load)
993 devfs_msg_t devfs_msg = devfs_msg_get();
995 devfs_msg->mdv_load = load;
996 devfs_msg_send(cmd, devfs_msg);
1000 * sends a message with a name argument.
1003 devfs_msg_send_name(uint32_t cmd, char *name)
1005 devfs_msg_t devfs_msg = devfs_msg_get();
1007 devfs_msg->mdv_name = name;
1008 devfs_msg_send(cmd, devfs_msg);
1012 * sends a message with a mount argument.
1015 devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt)
1017 devfs_msg_t devfs_msg = devfs_msg_get();
1019 devfs_msg->mdv_mnt = mnt;
1020 devfs_msg_send(cmd, devfs_msg);
1024 * sends a message with an ops argument.
1027 devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor)
1029 devfs_msg_t devfs_msg = devfs_msg_get();
1031 devfs_msg->mdv_ops.ops = ops;
1032 devfs_msg->mdv_ops.minor = minor;
1033 devfs_msg_send(cmd, devfs_msg);
1037 * sends a message with a clone handler argument.
1040 devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler)
1042 devfs_msg_t devfs_msg = devfs_msg_get();
1044 devfs_msg->mdv_chandler.name = name;
1045 devfs_msg->mdv_chandler.nhandler = handler;
1046 devfs_msg_send(cmd, devfs_msg);
1050 * sends a message with a device argument.
1053 devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms)
1055 devfs_msg_t devfs_msg = devfs_msg_get();
1057 devfs_msg->mdv_dev.dev = dev;
1058 devfs_msg->mdv_dev.uid = uid;
1059 devfs_msg->mdv_dev.gid = gid;
1060 devfs_msg->mdv_dev.perms = perms;
1062 devfs_msg_send(cmd, devfs_msg);
1066 * sends a message with a link argument.
1069 devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp)
1071 devfs_msg_t devfs_msg = devfs_msg_get();
1073 devfs_msg->mdv_link.name = name;
1074 devfs_msg->mdv_link.target = target;
1075 devfs_msg->mdv_link.mp = mp;
1076 devfs_msg_send(cmd, devfs_msg);
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.
1085 devfs_msg_core(void *arg)
1089 lwkt_initport_thread(&devfs_msg_port, curthread);
1091 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1094 lockmgr(&devfs_lock, LK_RELEASE);
1096 get_mplock(); /* mpsafe yet? */
1099 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0);
1100 devfs_debug(DEVFS_DEBUG_DEBUG,
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);
1114 devfs_msg_exec(devfs_msg_t msg)
1116 struct devfs_mnt_data *mnt;
1117 struct devfs_node *node;
1121 * Acquire the devfs lock to ensure safety of all called functions
1123 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1125 switch (msg->hdr.u.ms_result) {
1126 case DEVFS_DEVICE_CREATE:
1127 dev = msg->mdv_dev.dev;
1128 devfs_create_dev_worker(dev,
1131 msg->mdv_dev.perms);
1133 case DEVFS_DEVICE_DESTROY:
1134 dev = msg->mdv_dev.dev;
1135 devfs_destroy_dev_worker(dev);
1137 case DEVFS_DESTROY_RELATED:
1138 devfs_destroy_related_worker(msg->mdv_load);
1140 case DEVFS_DESTROY_DEV_BY_OPS:
1141 devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops,
1142 msg->mdv_ops.minor);
1144 case DEVFS_CREATE_ALL_DEV:
1145 node = (struct devfs_node *)msg->mdv_load;
1146 devfs_create_all_dev_worker(node);
1148 case DEVFS_MOUNT_ADD:
1150 TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link);
1151 devfs_create_all_dev_worker(mnt->root_node);
1153 case DEVFS_MOUNT_DEL:
1155 TAILQ_REMOVE(&devfs_mnt_list, mnt, link);
1156 devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback,
1158 if (mnt->leak_count) {
1159 devfs_debug(DEVFS_DEBUG_SHOW,
1160 "Leaked %ld devfs_node elements!\n",
1164 case DEVFS_CHANDLER_ADD:
1165 devfs_chandler_add_worker(msg->mdv_chandler.name,
1166 msg->mdv_chandler.nhandler);
1168 case DEVFS_CHANDLER_DEL:
1169 devfs_chandler_del_worker(msg->mdv_chandler.name);
1171 case DEVFS_FIND_DEVICE_BY_NAME:
1172 devfs_find_device_by_name_worker(msg);
1174 case DEVFS_FIND_DEVICE_BY_UDEV:
1175 devfs_find_device_by_udev_worker(msg);
1177 case DEVFS_MAKE_ALIAS:
1178 devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load);
1180 case DEVFS_DESTROY_ALIAS:
1181 devfs_destroy_alias_worker((struct devfs_alias *)msg->mdv_load);
1183 case DEVFS_APPLY_RULES:
1184 devfs_apply_reset_rules_caller(msg->mdv_name, 1);
1186 case DEVFS_RESET_RULES:
1187 devfs_apply_reset_rules_caller(msg->mdv_name, 0);
1189 case DEVFS_SCAN_CALLBACK:
1190 devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load,
1193 case DEVFS_CLR_RELATED_FLAG:
1194 devfs_clr_related_flag_worker(msg->mdv_flags.dev,
1195 msg->mdv_flags.flag);
1197 case DEVFS_DESTROY_RELATED_WO_FLAG:
1198 devfs_destroy_related_without_flag_worker(msg->mdv_flags.dev,
1199 msg->mdv_flags.flag);
1201 case DEVFS_INODE_TO_VNODE:
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,
1207 case DEVFS_TERMINATE_CORE:
1213 devfs_debug(DEVFS_DEBUG_WARNING,
1214 "devfs_msg_core: unknown message "
1215 "received at core\n");
1218 lockmgr(&devfs_lock, LK_RELEASE);
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.
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.
1230 devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms)
1236 dev->si_perms = perms;
1238 devfs_link_dev(dev);
1239 devfs_propagate_dev(dev, 1);
1241 udev_event_attach(dev, NULL, 0);
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.
1252 devfs_destroy_dev_worker(cdev_t dev)
1257 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1259 error = devfs_unlink_dev(dev);
1260 devfs_propagate_dev(dev, 0);
1262 udev_event_detach(dev, NULL, 0);
1265 release_dev(dev); /* link ref */
1273 * Worker function to destroy all devices with a certain basename.
1274 * Calls devfs_destroy_dev_worker for the actual destruction.
1277 devfs_destroy_related_worker(cdev_t needle)
1282 devfs_debug(DEVFS_DEBUG_DEBUG, "related worker: %s\n",
1284 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1285 if (dev->si_parent == needle) {
1286 devfs_destroy_related_worker(dev);
1287 devfs_destroy_dev_worker(dev);
1295 devfs_clr_related_flag_worker(cdev_t needle, uint32_t flag)
1299 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1300 if (dev->si_parent == needle) {
1301 devfs_clr_related_flag_worker(dev, flag);
1302 dev->si_flags &= ~flag;
1310 devfs_destroy_related_without_flag_worker(cdev_t needle, uint32_t flag)
1315 devfs_debug(DEVFS_DEBUG_DEBUG, "related_wo_flag: %s\n",
1318 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1319 if (dev->si_parent == needle) {
1320 devfs_destroy_related_without_flag_worker(dev, flag);
1321 if (!(dev->si_flags & flag)) {
1322 devfs_destroy_dev_worker(dev);
1323 devfs_debug(DEVFS_DEBUG_DEBUG,
1324 "related_wo_flag: %s restart\n", dev->si_name);
1334 * Worker function that creates all device nodes on top of a devfs
1338 devfs_create_all_dev_worker(struct devfs_node *root)
1344 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1345 devfs_create_device_node(root, dev, NULL, NULL);
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.
1357 devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor)
1363 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1364 if (dev->si_ops != ops)
1366 if ((minor < 0) || (dev->si_uminor == minor)) {
1367 devfs_destroy_dev_worker(dev);
1375 * Worker function that registers a new clone handler in devfs.
1378 devfs_chandler_add_worker(const char *name, d_clone_t *nhandler)
1380 struct devfs_clone_handler *chandler = NULL;
1381 u_char len = strlen(name);
1386 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1387 if (chandler->namlen != len)
1390 if (!memcmp(chandler->name, name, len)) {
1391 /* Clonable basename already exists */
1396 chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO);
1397 chandler->name = kstrdup(name, M_DEVFS);
1398 chandler->namlen = len;
1399 chandler->nhandler = nhandler;
1401 TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link);
1406 * Worker function that removes a given clone handler from the
1407 * clone handler list.
1410 devfs_chandler_del_worker(const char *name)
1412 struct devfs_clone_handler *chandler, *chandler2;
1413 u_char len = strlen(name);
1418 TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) {
1419 if (chandler->namlen != len)
1421 if (memcmp(chandler->name, name, len))
1424 TAILQ_REMOVE(&devfs_chandler_list, chandler, link);
1425 kfree(chandler->name, M_DEVFS);
1426 kfree(chandler, M_DEVFS);
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.
1439 devfs_find_device_by_name_worker(devfs_msg_t devfs_msg)
1441 struct devfs_alias *alias;
1443 cdev_t found = NULL;
1445 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1446 if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) {
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;
1459 devfs_msg->mdv_cdev = found;
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.
1470 devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg)
1473 cdev_t found = NULL;
1475 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1476 if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) {
1481 devfs_msg->mdv_cdev = found;
1487 * Worker function that inserts a given alias into the
1488 * alias list, and propagates the alias to all mount
1492 devfs_make_alias_worker(struct devfs_alias *alias)
1494 struct devfs_alias *alias2;
1495 size_t len = strlen(alias->name);
1498 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1499 if (len != alias2->namlen)
1502 if (!memcmp(alias->name, alias2->name, len)) {
1510 * The alias doesn't exist yet, so we add it to the alias list
1512 TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link);
1513 devfs_alias_propagate(alias, 0);
1514 udev_event_attach(alias->dev_target, alias->name, 1);
1516 devfs_debug(DEVFS_DEBUG_WARNING,
1517 "Warning: duplicate devfs_make_alias for %s\n",
1519 kfree(alias->name, M_DEVFS);
1520 kfree(alias, M_DEVFS);
1527 * Worker function that delete a given alias from the
1528 * alias list, and propagates the removal to all mount
1532 devfs_destroy_alias_worker(struct devfs_alias *alias)
1534 struct devfs_alias *alias2;
1537 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1538 if (alias->dev_target != alias2->dev_target)
1541 if (devfs_WildCmp(alias->name, alias2->name) == 0) {
1548 devfs_debug(DEVFS_DEBUG_WARNING,
1549 "Warning: devfs_destroy_alias for inexistant alias: %s\n",
1551 kfree(alias->name, M_DEVFS);
1552 kfree(alias, M_DEVFS);
1555 * The alias exists, so we delete it from the alias list
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);
1570 * Function that removes and frees all aliases.
1573 devfs_alias_reap(void)
1575 struct devfs_alias *alias, *alias2;
1577 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1578 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1579 kfree(alias->name, M_DEVFS);
1580 kfree(alias, M_DEVFS);
1586 * Function that removes an alias matching a specific cdev and frees
1590 devfs_alias_remove(cdev_t dev)
1592 struct devfs_alias *alias, *alias2;
1594 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1595 if (alias->dev_target == dev) {
1596 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1597 udev_event_detach(alias->dev_target, alias->name, 1);
1598 kfree(alias->name, M_DEVFS);
1599 kfree(alias, M_DEVFS);
1606 * This function propagates an alias addition or removal to
1610 devfs_alias_propagate(struct devfs_alias *alias, int remove)
1612 struct devfs_mnt_data *mnt;
1614 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1616 devfs_destroy_node(mnt->root_node, alias->name);
1618 devfs_alias_apply(mnt->root_node, alias);
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.
1630 devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias)
1632 struct devfs_node *node1, *node2;
1634 KKASSERT(alias != NULL);
1636 if ((node->node_type == Nroot) || (node->node_type == Ndir)) {
1637 if (node->nchildren > 2) {
1638 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
1639 devfs_alias_apply(node1, alias);
1643 if (node->d_dev == alias->dev_target)
1644 devfs_alias_create(alias->name, node, 0);
1650 * This function checks if any alias possibly is applicable
1651 * to the given node. If so, the alias is created.
1654 devfs_alias_check_create(struct devfs_node *node)
1656 struct devfs_alias *alias;
1658 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1659 if (node->d_dev == alias->dev_target)
1660 devfs_alias_create(alias->name, node, 0);
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.
1671 devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based)
1673 struct mount *mp = target->mp;
1674 struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node;
1675 struct devfs_node *linknode;
1676 char *create_path = NULL;
1681 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1683 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1684 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name);
1687 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1690 if (devfs_find_device_node_by_name(parent, name)) {
1691 devfs_debug(DEVFS_DEBUG_WARNING,
1692 "Node already exists: %s "
1693 "(devfs_make_alias_worker)!\n",
1699 linknode = devfs_allocp(Nlink, name, parent, mp, NULL);
1700 if (linknode == NULL) {
1705 linknode->link_target = target;
1709 linknode->flags |= DEVFS_RULE_CREATED;
1712 kfree(name_buf, M_TEMP);
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
1723 devfs_apply_reset_rules_caller(char *mountto, int apply)
1725 struct devfs_mnt_data *mnt;
1727 if (mountto[0] == '*') {
1728 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1729 devfs_iterate_topology(mnt->root_node,
1730 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1734 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1735 if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) {
1736 devfs_iterate_topology(mnt->root_node,
1737 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1744 kfree(mountto, M_DEVFS);
1749 * This function calls a given callback function for
1750 * every dev node in the devfs dev list.
1753 devfs_scan_callback_worker(devfs_scan_t *callback, void *arg)
1756 struct devfs_alias *alias, *alias1;
1758 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1759 callback(dev->si_name, dev, false, arg);
1761 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias1) {
1762 callback(alias->name, alias->dev_target, true, arg);
1769 * This function tries to resolve a given directory, or if not
1770 * found and creation requested, creates the given directory.
1772 static struct devfs_node *
1773 devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name,
1774 size_t name_len, int create)
1776 struct devfs_node *node, *found = NULL;
1778 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1779 if (name_len != node->d_dir.d_namlen)
1782 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) {
1788 if ((found == NULL) && (create)) {
1789 found = devfs_allocp(Ndir, dir_name, parent, parent->mp, NULL);
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),
1801 devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create)
1803 struct devfs_node *node = parent;
1810 buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1812 while (*path && idx < PATH_MAX - 1) {
1817 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1827 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1828 kfree (buf, M_TEMP);
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
1839 devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep)
1843 size_t len = strlen(fullpath) + 1;
1846 KKASSERT((fullpath != NULL) && (buf != NULL));
1847 KKASSERT((pathp != NULL) && (namep != NULL));
1849 memcpy(buf, fullpath, len);
1851 for (i = len-1; i>= 0; i--) {
1852 if (buf[i] == '/') {
1872 * This function creates a new devfs node for a given device. It can
1873 * handle a complete path as device name, and accordingly creates
1874 * the path and the final device node.
1876 * The reference count on the passed dev remains unchanged.
1879 devfs_create_device_node(struct devfs_node *root, cdev_t dev,
1880 char *dev_name, char *path_fmt, ...)
1882 struct devfs_node *parent, *node = NULL;
1888 char *create_path = NULL;
1889 char *names = "pqrsPQRS";
1891 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1893 if (path_fmt != NULL) {
1894 __va_start(ap, path_fmt);
1895 kvasnrprintf(&path, PATH_MAX, 10, path_fmt, ap);
1899 parent = devfs_resolve_or_create_path(root, path, 1);
1902 devfs_resolve_name_path(
1903 ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name),
1904 name_buf, &create_path, &name);
1907 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1910 if (devfs_find_device_node_by_name(parent, name)) {
1911 devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: "
1912 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name);
1916 node = devfs_allocp(Ndev, name, parent, parent->mp, dev);
1917 nanotime(&parent->mtime);
1920 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their
1923 if ((dev) && (strlen(dev->si_name) >= 4) &&
1924 (!memcmp(dev->si_name, "ptm/", 4))) {
1925 node->parent->flags |= DEVFS_HIDDEN;
1926 node->flags |= DEVFS_HIDDEN;
1930 * Ugly pty magic, to tag pty devices as such and hide them if needed.
1932 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3)))
1933 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1935 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) {
1937 for (i = 0; i < strlen(names); i++) {
1938 if (name[3] == names[i]) {
1944 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1948 kfree(name_buf, M_TEMP);
1954 * This function finds a given device node in the topology with a given
1958 devfs_find_device_node_callback(struct devfs_node *node, cdev_t target)
1960 if ((node->node_type == Ndev) && (node->d_dev == target)) {
1968 * This function finds a device node in the given parent directory by its
1969 * name and returns it.
1972 devfs_find_device_node_by_name(struct devfs_node *parent, char *target)
1974 struct devfs_node *node, *found = NULL;
1975 size_t len = strlen(target);
1977 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1978 if (len != node->d_dir.d_namlen)
1981 if (!memcmp(node->d_dir.d_name, target, len)) {
1991 devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop)
1993 struct vnode *vp = NULL;
1994 ino_t target = *inop;
1996 if (node->d_dir.d_ino == target) {
1999 vget(vp, LK_EXCLUSIVE | LK_RETRY);
2002 devfs_allocv(&vp, node);
2011 * This function takes a cdev and removes its devfs node in the
2012 * given topology. The cdev remains intact.
2015 devfs_destroy_device_node(struct devfs_node *root, cdev_t target)
2017 KKASSERT(target != NULL);
2018 return devfs_destroy_node(root, target->si_name);
2022 * This function takes a path to a devfs node, resolves it and
2023 * removes the devfs node from the given topology.
2026 devfs_destroy_node(struct devfs_node *root, char *target)
2028 struct devfs_node *node, *parent;
2031 char *create_path = NULL;
2035 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
2036 ksnprintf(name_buf, PATH_MAX, "%s", target);
2038 devfs_resolve_name_path(target, name_buf, &create_path, &name);
2041 parent = devfs_resolve_or_create_path(root, create_path, 0);
2045 if (parent == NULL) {
2046 kfree(name_buf, M_TEMP);
2050 node = devfs_find_device_node_by_name(parent, name);
2053 nanotime(&node->parent->mtime);
2057 kfree(name_buf, M_TEMP);
2063 * Just set perms and ownership for given node.
2066 devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid,
2067 u_short mode, u_long flags)
2077 * Propagates a device attach/detach to all mount
2078 * points. Also takes care of automatic alias removal
2079 * for a deleted cdev.
2082 devfs_propagate_dev(cdev_t dev, int attach)
2084 struct devfs_mnt_data *mnt;
2086 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
2088 /* Device is being attached */
2089 devfs_create_device_node(mnt->root_node, dev,
2092 /* Device is being detached */
2093 devfs_alias_remove(dev);
2094 devfs_destroy_device_node(mnt->root_node, dev);
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.
2107 devfs_clone(cdev_t dev, const char *name, size_t len, int mode,
2111 struct devfs_clone_handler *chandler;
2112 struct dev_clone_args ap;
2114 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
2115 if (chandler->namlen != len)
2117 if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) {
2118 lockmgr(&devfs_lock, LK_RELEASE);
2120 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2122 ap.a_head.a_dev = dev;
2128 error = (chandler->nhandler)(&ap);
2141 * Registers a new orphan in the orphan list.
2144 devfs_tracer_add_orphan(struct devfs_node *node)
2146 struct devfs_orphan *orphan;
2149 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK);
2150 orphan->node = node;
2152 KKASSERT((node->flags & DEVFS_ORPHANED) == 0);
2153 node->flags |= DEVFS_ORPHANED;
2154 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link);
2158 * Removes an orphan from the orphan list.
2161 devfs_tracer_del_orphan(struct devfs_node *node)
2163 struct devfs_orphan *orphan;
2167 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) {
2168 if (orphan->node == node) {
2169 node->flags &= ~DEVFS_ORPHANED;
2170 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link);
2171 kfree(orphan, M_DEVFS);
2178 * Counts the orphans in the orphan list, and if cleanup
2179 * is specified, also frees the orphan and removes it from
2183 devfs_tracer_orphan_count(struct mount *mp, int cleanup)
2185 struct devfs_orphan *orphan, *orphan2;
2188 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) {
2191 * If we are instructed to clean up, we do so.
2194 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link);
2195 orphan->node->flags &= ~DEVFS_ORPHANED;
2196 devfs_freep(orphan->node);
2197 kfree(orphan, M_DEVFS);
2205 * Fetch an ino_t from the global d_ino by increasing it
2209 devfs_fetch_ino(void)
2213 spin_lock(&ino_lock);
2215 spin_unlock(&ino_lock);
2221 * Allocates a new cdev and initializes it's most basic
2225 devfs_new_cdev(struct dev_ops *ops, int minor, struct dev_ops *bops)
2227 cdev_t dev = sysref_alloc(&cdev_sysref_class);
2229 sysref_activate(&dev->si_sysref);
2231 bzero(dev, offsetof(struct cdev, si_sysref));
2236 dev->si_drv1 = NULL;
2237 dev->si_drv2 = NULL;
2238 dev->si_lastread = 0; /* time_second */
2239 dev->si_lastwrite = 0; /* time_second */
2241 dev->si_dict = NULL;
2242 dev->si_parent = NULL;
2246 dev->si_uminor = minor;
2247 dev->si_bops = bops;
2250 * Since the disk subsystem is in the way, we need to
2251 * propagate the D_CANFREE from bops (and ops) to
2254 if (bops && (bops->head.flags & D_CANFREE)) {
2255 dev->si_flags |= SI_CANFREE;
2256 } else if (ops->head.flags & D_CANFREE) {
2257 dev->si_flags |= SI_CANFREE;
2260 /* If there is a backing device, we reference its ops */
2261 dev->si_inode = makeudev(
2262 devfs_reference_ops((bops)?(bops):(ops)),
2269 devfs_cdev_terminate(cdev_t dev)
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);
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.
2287 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
2289 /* If we acquired the lock, we also get rid of it */
2291 lockmgr(&devfs_lock, LK_RELEASE);
2293 /* If there is a backing device, we release the backing device's ops */
2294 devfs_release_ops((dev->si_bops)?(dev->si_bops):(dev->si_ops));
2296 /* Finally destroy the device */
2297 sysref_put(&dev->si_sysref);
2301 * Dummies for now (individual locks for MPSAFE)
2304 devfs_cdev_lock(cdev_t dev)
2309 devfs_cdev_unlock(cdev_t dev)
2314 devfs_detached_filter_eof(struct knote *kn, long hint)
2316 kn->kn_flags |= (EV_EOF | EV_NODATA);
2321 devfs_detached_filter_detach(struct knote *kn)
2323 cdev_t dev = (cdev_t)kn->kn_hook;
2325 knote_remove(&dev->si_kqinfo.ki_note, kn);
2328 static struct filterops devfs_detached_filterops =
2329 { FILTEROP_ISFD, NULL,
2330 devfs_detached_filter_detach,
2331 devfs_detached_filter_eof };
2334 * Delegates knote filter handling responsibility to devfs
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.
2341 devfs_assume_knotes(cdev_t dev, struct kqinfo *kqi)
2344 * Let kern/kern_event.c do the heavy lifting.
2346 knote_assume_knotes(kqi, &dev->si_kqinfo,
2347 &devfs_detached_filterops, (void *)dev);
2350 * These should probably be activated individually, but doing so
2351 * would require refactoring kq's public in-kernel interface.
2353 KNOTE(&dev->si_kqinfo.ki_note, 0);
2357 * Links a given cdev into the dev list.
2360 devfs_link_dev(cdev_t dev)
2362 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
2363 dev->si_flags |= SI_DEVFS_LINKED;
2364 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link);
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.
2373 * Returns EALREADY if the dev has already been unlinked.
2376 devfs_unlink_dev(cdev_t dev)
2378 if ((dev->si_flags & SI_DEVFS_LINKED)) {
2379 TAILQ_REMOVE(&devfs_dev_list, dev, link);
2380 dev->si_flags &= ~SI_DEVFS_LINKED;
2387 devfs_node_is_accessible(struct devfs_node *node)
2389 if ((node) && (!(node->flags & DEVFS_HIDDEN)))
2396 devfs_reference_ops(struct dev_ops *ops)
2399 struct devfs_dev_ops *found = NULL;
2400 struct devfs_dev_ops *devops;
2402 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2403 if (devops->ops == ops) {
2410 found = kmalloc(sizeof(struct devfs_dev_ops), M_DEVFS, M_WAITOK);
2412 found->ref_count = 0;
2413 TAILQ_INSERT_TAIL(&devfs_dev_ops_list, found, link);
2418 if (found->ref_count == 0) {
2419 found->id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255);
2420 if (found->id == -1) {
2421 /* Ran out of unique ids */
2422 devfs_debug(DEVFS_DEBUG_WARNING,
2423 "devfs_reference_ops: WARNING: ran out of unique ids\n");
2433 devfs_release_ops(struct dev_ops *ops)
2435 struct devfs_dev_ops *found = NULL;
2436 struct devfs_dev_ops *devops;
2438 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2439 if (devops->ops == ops) {
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);
2457 * Wait for asynchronous messages to complete in the devfs helper
2458 * thread, then return. Do nothing if the helper thread is dead
2459 * or we are being indirectly called from the helper thread itself.
2466 if (devfs_run && curthread != td_core) {
2467 msg = devfs_msg_get();
2468 msg = devfs_msg_send_sync(DEVFS_SYNC, msg);
2474 * Called on init of devfs; creates the objcaches and
2475 * spawns off the devfs core thread. Also initializes
2481 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n");
2482 /* Create objcaches for nodes, msgs and devs */
2483 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0,
2485 objcache_malloc_alloc,
2486 objcache_malloc_free,
2487 &devfs_node_malloc_args );
2489 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0,
2491 objcache_malloc_alloc,
2492 objcache_malloc_free,
2493 &devfs_msg_malloc_args );
2495 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0,
2497 objcache_malloc_alloc,
2498 objcache_malloc_free,
2499 &devfs_dev_malloc_args );
2501 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id));
2503 /* Initialize the reply-only port which acts as a message drain */
2504 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply);
2506 /* Initialize *THE* devfs lock */
2507 lockinit(&devfs_lock, "devfs_core lock", 0, 0);
2509 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2510 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL,
2511 0, -1, "devfs_msg_core");
2512 while (devfs_run == 0)
2513 lksleep(td_core, &devfs_lock, 0, "devfsc", 0);
2514 lockmgr(&devfs_lock, LK_RELEASE);
2516 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n");
2520 * Called on unload of devfs; takes care of destroying the core
2521 * and the objcaches. Also removes aliases that are no longer needed.
2526 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
2528 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL);
2530 tsleep(td_core, 0, "devfsc", hz*10);
2531 tsleep(td_core, 0, "devfsc", hz);
2533 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id));
2535 /* Destroy the objcaches */
2536 objcache_destroy(devfs_msg_cache);
2537 objcache_destroy(devfs_node_cache);
2538 objcache_destroy(devfs_dev_cache);
2544 * This is a sysctl handler to assist userland devname(3) to
2545 * find the device name for a given udev.
2548 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS)
2555 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t))))
2558 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev);
2563 if ((found = devfs_find_device_by_udev(udev)) == NULL)
2566 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1));
2570 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
2571 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)");
2573 SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
2574 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable);
2575 SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable,
2576 0, "Enable DevFS debugging");
2578 SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST,
2580 SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY,
2581 devfs_uninit, NULL);
2584 * WildCmp() - compare wild string to sane string
2586 * Returns 0 on success, -1 on failure.
2589 wildCmp(const char **mary, int d, const char *w, const char *s)
2594 * skip fixed portion
2600 * optimize terminator
2604 if (w[1] != '?' && w[1] != '*') {
2606 * optimize * followed by non-wild
2608 for (i = 0; s + i < mary[d]; ++i) {
2609 if (s[i] == w[1] && wildCmp(mary, d + 1, w + 1, s + i) == 0)
2616 for (i = 0; s + i < mary[d]; ++i) {
2617 if (wildCmp(mary, d + 1, w + 1, s + i) == 0)
2632 if (*w == 0) /* terminator */
2645 * WildCaseCmp() - compare wild string to sane string, case insensitive
2647 * Returns 0 on success, -1 on failure.
2650 wildCaseCmp(const char **mary, int d, const char *w, const char *s)
2655 * skip fixed portion
2661 * optimize terminator
2665 if (w[1] != '?' && w[1] != '*') {
2667 * optimize * followed by non-wild
2669 for (i = 0; s + i < mary[d]; ++i) {
2670 if (s[i] == w[1] && wildCaseCmp(mary, d + 1, w + 1, s + i) == 0)
2677 for (i = 0; s + i < mary[d]; ++i) {
2678 if (wildCaseCmp(mary, d + 1, w + 1, s + i) == 0)
2692 #define tolower(x) ((x >= 'A' && x <= 'Z')?(x+('a'-'A')):(x))
2693 if (tolower(*w) != tolower(*s))
2696 if (*w == 0) /* terminator */
2708 devfs_WildCmp(const char *w, const char *s)
2712 int slen = strlen(s);
2715 for (i = c = 0; w[i]; ++i) {
2719 mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK);
2720 for (i = 0; i < c; ++i)
2722 i = wildCmp(mary, 0, w, s);
2723 kfree(mary, M_DEVFS);
2728 devfs_WildCaseCmp(const char *w, const char *s)
2732 int slen = strlen(s);
2735 for (i = c = 0; w[i]; ++i) {
2739 mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK);
2740 for (i = 0; i < c; ++i)
2742 i = wildCaseCmp(mary, 0, w, s);
2743 kfree(mary, M_DEVFS);