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 * devfs master lock must not be held across a vget() call, we have
297 * to hold our ad-hoc vp to avoid a free race from destroying the
298 * contents of the structure. The vget() will interlock recycles
302 while ((vp = node->v_node) != NULL) {
304 lockmgr(&devfs_lock, LK_RELEASE);
305 error = vget(vp, LK_EXCLUSIVE);
307 lockmgr(&devfs_lock, LK_EXCLUSIVE);
312 if (error != ENOENT) {
319 * devfs master lock must not be held across a getnewvnode() call.
321 lockmgr(&devfs_lock, LK_RELEASE);
322 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0) {
323 lockmgr(&devfs_lock, LK_EXCLUSIVE);
326 lockmgr(&devfs_lock, LK_EXCLUSIVE);
330 if (node->v_node != NULL) {
339 switch (node->node_type) {
341 vsetflags(vp, VROOT);
357 KKASSERT(node->d_dev);
359 vp->v_uminor = node->d_dev->si_uminor;
360 vp->v_umajor = node->d_dev->si_umajor;
362 v_associate_rdev(vp, node->d_dev);
363 vp->v_ops = &node->mp->mnt_vn_spec_ops;
367 panic("devfs_allocv: unknown node type");
375 * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode
376 * based on the newly created devfs node.
379 devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype,
380 char *name, struct devfs_node *parent, cdev_t dev)
382 struct devfs_node *node;
384 node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
387 devfs_allocv(vpp, node);
395 * Destroy the devfs_node. The node must be unlinked from the topology.
397 * This function will also destroy any vnode association with the node
400 * The cdev_t itself remains intact.
402 * The core lock is not necessarily held on call and must be temporarily
403 * released if it is to avoid a deadlock.
406 devfs_freep(struct devfs_node *node)
412 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) ||
413 (node->node_type == Nroot));
416 * Protect against double frees
418 KKASSERT((node->flags & DEVFS_DESTROYED) == 0);
419 node->flags |= DEVFS_DESTROYED;
422 * Avoid deadlocks between devfs_lock and the vnode lock when
423 * disassociating the vnode (stress2 pty vs ls -la /dev/pts).
425 * This also prevents the vnode reclaim code from double-freeing
426 * the node. The vget() is required to safely modified the vp
427 * and cycle the refs to terminate an inactive vp.
429 if (lockstatus(&devfs_lock, curthread) == LK_EXCLUSIVE) {
430 lockmgr(&devfs_lock, LK_RELEASE);
436 while ((vp = node->v_node) != NULL) {
437 if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0)
442 cache_inval_vp(vp, CINV_DESTROY);
449 atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->leak_count, 1);
450 if (node->symlink_name) {
451 kfree(node->symlink_name, M_DEVFS);
452 node->symlink_name = NULL;
456 * Remove the node from the orphan list if it is still on it.
458 if (node->flags & DEVFS_ORPHANED)
459 devfs_tracer_del_orphan(node);
461 if (node->d_dir.d_name) {
462 kfree(node->d_dir.d_name, M_DEVFS);
463 node->d_dir.d_name = NULL;
465 atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->file_count, 1);
466 objcache_put(devfs_node_cache, node);
469 lockmgr(&devfs_lock, LK_EXCLUSIVE);
475 * Unlink the devfs node from the topology and add it to the orphan list.
476 * The node will later be destroyed by freep.
478 * Any vnode association, including the v_rdev and v_data, remains intact
482 devfs_unlinkp(struct devfs_node *node)
484 struct devfs_node *parent;
488 * Add the node to the orphan list, so it is referenced somewhere, to
489 * so we don't leak it.
491 devfs_tracer_add_orphan(node);
493 parent = node->parent;
496 * If the parent is known we can unlink the node out of the topology
499 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
501 node->flags &= ~DEVFS_NODE_LINKED;
509 devfs_iterate_topology(struct devfs_node *node,
510 devfs_iterate_callback_t *callback, void *arg1)
512 struct devfs_node *node1, *node2;
515 if ((node->node_type == Nroot) || (node->node_type == Ndir)) {
516 if (node->nchildren > 2) {
517 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node),
519 if ((ret = devfs_iterate_topology(node1, callback, arg1)))
525 ret = callback(node, arg1);
530 * devfs_reaperp() is a recursive function that iterates through all the
531 * topology, unlinking and freeing all devfs nodes.
534 devfs_reaperp_callback(struct devfs_node *node, void *unused)
543 devfs_gc_dirs_callback(struct devfs_node *node, void *unused)
545 if (node->node_type == Ndir) {
546 if ((node->nchildren == 2) &&
547 !(node->flags & DEVFS_USER_CREATED)) {
557 devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target)
559 if ((node->node_type == Nlink) && (node->link_target == target)) {
568 * devfs_gc() is devfs garbage collector. It takes care of unlinking and
569 * freeing a node, but also removes empty directories and links that link
570 * via devfs auto-link mechanism to the node being deleted.
573 devfs_gc(struct devfs_node *node)
575 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
577 if (node->nlinks > 0)
578 devfs_iterate_topology(root_node,
579 (devfs_iterate_callback_t *)devfs_gc_links_callback, node);
582 devfs_iterate_topology(root_node,
583 (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL);
591 * devfs_create_dev() is the asynchronous entry point for device creation.
592 * It just sends a message with the relevant details to the devfs core.
594 * This function will reference the passed device. The reference is owned
595 * by devfs and represents all of the device's node associations.
598 devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
601 devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
607 * devfs_destroy_dev() is the asynchronous entry point for device destruction.
608 * It just sends a message with the relevant details to the devfs core.
611 devfs_destroy_dev(cdev_t dev)
613 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
618 * devfs_mount_add() is the synchronous entry point for adding a new devfs
619 * mount. It sends a synchronous message with the relevant details to the
623 devfs_mount_add(struct devfs_mnt_data *mnt)
627 msg = devfs_msg_get();
629 msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg);
636 * devfs_mount_del() is the synchronous entry point for removing a devfs mount.
637 * It sends a synchronous message with the relevant details to the devfs core.
640 devfs_mount_del(struct devfs_mnt_data *mnt)
644 msg = devfs_msg_get();
646 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
653 * devfs_destroy_related() is the synchronous entry point for device
654 * destruction by subname. It just sends a message with the relevant details to
658 devfs_destroy_related(cdev_t dev)
662 msg = devfs_msg_get();
664 msg = devfs_msg_send_sync(DEVFS_DESTROY_RELATED, msg);
670 devfs_clr_related_flag(cdev_t dev, uint32_t flag)
674 msg = devfs_msg_get();
675 msg->mdv_flags.dev = dev;
676 msg->mdv_flags.flag = flag;
677 msg = devfs_msg_send_sync(DEVFS_CLR_RELATED_FLAG, msg);
684 devfs_destroy_related_without_flag(cdev_t dev, uint32_t flag)
688 msg = devfs_msg_get();
689 msg->mdv_flags.dev = dev;
690 msg->mdv_flags.flag = flag;
691 msg = devfs_msg_send_sync(DEVFS_DESTROY_RELATED_WO_FLAG, msg);
698 * devfs_create_all_dev is the asynchronous entry point to trigger device
699 * node creation. It just sends a message with the relevant details to
703 devfs_create_all_dev(struct devfs_node *root)
705 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
710 * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all
711 * devices with a specific set of dev_ops and minor. It just sends a
712 * message with the relevant details to the devfs core.
715 devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor)
717 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor);
722 * devfs_clone_handler_add is the synchronous entry point to add a new
723 * clone handler. It just sends a message with the relevant details to
727 devfs_clone_handler_add(const char *name, d_clone_t *nhandler)
731 msg = devfs_msg_get();
732 msg->mdv_chandler.name = name;
733 msg->mdv_chandler.nhandler = nhandler;
734 msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg);
740 * devfs_clone_handler_del is the synchronous entry point to remove a
741 * clone handler. It just sends a message with the relevant details to
745 devfs_clone_handler_del(const char *name)
749 msg = devfs_msg_get();
750 msg->mdv_chandler.name = name;
751 msg->mdv_chandler.nhandler = NULL;
752 msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg);
758 * devfs_find_device_by_name is the synchronous entry point to find a
759 * device given its name. It sends a synchronous message with the
760 * relevant details to the devfs core and returns the answer.
763 devfs_find_device_by_name(const char *fmt, ...)
774 kvasnrprintf(&target, PATH_MAX, 10, fmt, ap);
777 msg = devfs_msg_get();
778 msg->mdv_name = target;
779 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
780 found = msg->mdv_cdev;
788 * devfs_find_device_by_udev is the synchronous entry point to find a
789 * device given its udev number. It sends a synchronous message with
790 * the relevant details to the devfs core and returns the answer.
793 devfs_find_device_by_udev(udev_t udev)
798 msg = devfs_msg_get();
799 msg->mdv_udev = udev;
800 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
801 found = msg->mdv_cdev;
804 devfs_debug(DEVFS_DEBUG_DEBUG,
805 "devfs_find_device_by_udev found? %s -end:3-\n",
806 ((found) ? found->si_name:"NO"));
811 devfs_inode_to_vnode(struct mount *mp, ino_t target)
813 struct vnode *vp = NULL;
819 msg = devfs_msg_get();
820 msg->mdv_ino.mp = mp;
821 msg->mdv_ino.ino = target;
822 msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg);
823 vp = msg->mdv_ino.vp;
824 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
831 * devfs_make_alias is the asynchronous entry point to register an alias
832 * for a device. It just sends a message with the relevant details to the
836 devfs_make_alias(const char *name, cdev_t dev_target)
838 struct devfs_alias *alias;
843 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
844 alias->name = kstrdup(name, M_DEVFS);
846 alias->dev_target = dev_target;
848 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
853 * devfs_destroy_alias is the asynchronous entry point to deregister an alias
854 * for a device. It just sends a message with the relevant details to the
858 devfs_destroy_alias(const char *name, cdev_t dev_target)
860 struct devfs_alias *alias;
865 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
866 alias->name = kstrdup(name, M_DEVFS);
868 alias->dev_target = dev_target;
870 devfs_msg_send_generic(DEVFS_DESTROY_ALIAS, alias);
875 * devfs_apply_rules is the asynchronous entry point to trigger application
876 * of all rules. It just sends a message with the relevant details to the
880 devfs_apply_rules(char *mntto)
884 new_name = kstrdup(mntto, M_DEVFS);
885 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
891 * devfs_reset_rules is the asynchronous entry point to trigger reset of all
892 * rules. It just sends a message with the relevant details to the devfs core.
895 devfs_reset_rules(char *mntto)
899 new_name = kstrdup(mntto, M_DEVFS);
900 devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
907 * devfs_scan_callback is the asynchronous entry point to call a callback
909 * It just sends a message with the relevant details to the devfs core.
912 devfs_scan_callback(devfs_scan_t *callback, void *arg)
918 msg = devfs_msg_get();
919 msg->mdv_load = callback;
920 msg->mdv_load2 = arg;
921 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
929 * Acts as a message drain. Any message that is replied to here gets destroyed
930 * and the memory freed.
933 devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
935 devfs_msg_put((devfs_msg_t)msg);
939 * devfs_msg_get allocates a new devfs msg and returns it.
944 return objcache_get(devfs_msg_cache, M_WAITOK);
948 * devfs_msg_put deallocates a given devfs msg.
951 devfs_msg_put(devfs_msg_t msg)
953 objcache_put(devfs_msg_cache, msg);
958 * devfs_msg_send is the generic asynchronous message sending facility
959 * for devfs. By default the reply port is the automatic disposal port.
961 * If the current thread is the devfs_msg_port thread we execute the
962 * operation synchronously.
965 devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
967 lwkt_port_t port = &devfs_msg_port;
969 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
971 devfs_msg->hdr.u.ms_result = cmd;
973 if (port->mpu_td == curthread) {
974 devfs_msg_exec(devfs_msg);
975 lwkt_replymsg(&devfs_msg->hdr, 0);
977 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
982 * devfs_msg_send_sync is the generic synchronous message sending
983 * facility for devfs. It initializes a local reply port and waits
984 * for the core's answer. This answer is then returned.
987 devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg)
989 struct lwkt_port rep_port;
990 devfs_msg_t msg_incoming;
991 lwkt_port_t port = &devfs_msg_port;
993 lwkt_initport_thread(&rep_port, curthread);
994 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
996 devfs_msg->hdr.u.ms_result = cmd;
998 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
999 msg_incoming = lwkt_waitport(&rep_port, 0);
1001 return msg_incoming;
1005 * sends a message with a generic argument.
1008 devfs_msg_send_generic(uint32_t cmd, void *load)
1010 devfs_msg_t devfs_msg = devfs_msg_get();
1012 devfs_msg->mdv_load = load;
1013 devfs_msg_send(cmd, devfs_msg);
1017 * sends a message with a name argument.
1020 devfs_msg_send_name(uint32_t cmd, char *name)
1022 devfs_msg_t devfs_msg = devfs_msg_get();
1024 devfs_msg->mdv_name = name;
1025 devfs_msg_send(cmd, devfs_msg);
1029 * sends a message with a mount argument.
1032 devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt)
1034 devfs_msg_t devfs_msg = devfs_msg_get();
1036 devfs_msg->mdv_mnt = mnt;
1037 devfs_msg_send(cmd, devfs_msg);
1041 * sends a message with an ops argument.
1044 devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor)
1046 devfs_msg_t devfs_msg = devfs_msg_get();
1048 devfs_msg->mdv_ops.ops = ops;
1049 devfs_msg->mdv_ops.minor = minor;
1050 devfs_msg_send(cmd, devfs_msg);
1054 * sends a message with a clone handler argument.
1057 devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler)
1059 devfs_msg_t devfs_msg = devfs_msg_get();
1061 devfs_msg->mdv_chandler.name = name;
1062 devfs_msg->mdv_chandler.nhandler = handler;
1063 devfs_msg_send(cmd, devfs_msg);
1067 * sends a message with a device argument.
1070 devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms)
1072 devfs_msg_t devfs_msg = devfs_msg_get();
1074 devfs_msg->mdv_dev.dev = dev;
1075 devfs_msg->mdv_dev.uid = uid;
1076 devfs_msg->mdv_dev.gid = gid;
1077 devfs_msg->mdv_dev.perms = perms;
1079 devfs_msg_send(cmd, devfs_msg);
1083 * sends a message with a link argument.
1086 devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp)
1088 devfs_msg_t devfs_msg = devfs_msg_get();
1090 devfs_msg->mdv_link.name = name;
1091 devfs_msg->mdv_link.target = target;
1092 devfs_msg->mdv_link.mp = mp;
1093 devfs_msg_send(cmd, devfs_msg);
1097 * devfs_msg_core is the main devfs thread. It handles all incoming messages
1098 * and calls the relevant worker functions. By using messages it's assured
1099 * that events occur in the correct order.
1102 devfs_msg_core(void *arg)
1106 lwkt_initport_thread(&devfs_msg_port, curthread);
1108 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1111 lockmgr(&devfs_lock, LK_RELEASE);
1113 get_mplock(); /* mpsafe yet? */
1116 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0);
1117 devfs_debug(DEVFS_DEBUG_DEBUG,
1118 "devfs_msg_core, new msg: %x\n",
1119 (unsigned int)msg->hdr.u.ms_result);
1120 devfs_msg_exec(msg);
1121 lwkt_replymsg(&msg->hdr, 0);
1131 devfs_msg_exec(devfs_msg_t msg)
1133 struct devfs_mnt_data *mnt;
1134 struct devfs_node *node;
1138 * Acquire the devfs lock to ensure safety of all called functions
1140 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1142 switch (msg->hdr.u.ms_result) {
1143 case DEVFS_DEVICE_CREATE:
1144 dev = msg->mdv_dev.dev;
1145 devfs_create_dev_worker(dev,
1148 msg->mdv_dev.perms);
1150 case DEVFS_DEVICE_DESTROY:
1151 dev = msg->mdv_dev.dev;
1152 devfs_destroy_dev_worker(dev);
1154 case DEVFS_DESTROY_RELATED:
1155 devfs_destroy_related_worker(msg->mdv_load);
1157 case DEVFS_DESTROY_DEV_BY_OPS:
1158 devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops,
1159 msg->mdv_ops.minor);
1161 case DEVFS_CREATE_ALL_DEV:
1162 node = (struct devfs_node *)msg->mdv_load;
1163 devfs_create_all_dev_worker(node);
1165 case DEVFS_MOUNT_ADD:
1167 TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link);
1168 devfs_create_all_dev_worker(mnt->root_node);
1170 case DEVFS_MOUNT_DEL:
1172 TAILQ_REMOVE(&devfs_mnt_list, mnt, link);
1173 devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback,
1175 if (mnt->leak_count) {
1176 devfs_debug(DEVFS_DEBUG_SHOW,
1177 "Leaked %ld devfs_node elements!\n",
1181 case DEVFS_CHANDLER_ADD:
1182 devfs_chandler_add_worker(msg->mdv_chandler.name,
1183 msg->mdv_chandler.nhandler);
1185 case DEVFS_CHANDLER_DEL:
1186 devfs_chandler_del_worker(msg->mdv_chandler.name);
1188 case DEVFS_FIND_DEVICE_BY_NAME:
1189 devfs_find_device_by_name_worker(msg);
1191 case DEVFS_FIND_DEVICE_BY_UDEV:
1192 devfs_find_device_by_udev_worker(msg);
1194 case DEVFS_MAKE_ALIAS:
1195 devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load);
1197 case DEVFS_DESTROY_ALIAS:
1198 devfs_destroy_alias_worker((struct devfs_alias *)msg->mdv_load);
1200 case DEVFS_APPLY_RULES:
1201 devfs_apply_reset_rules_caller(msg->mdv_name, 1);
1203 case DEVFS_RESET_RULES:
1204 devfs_apply_reset_rules_caller(msg->mdv_name, 0);
1206 case DEVFS_SCAN_CALLBACK:
1207 devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load,
1210 case DEVFS_CLR_RELATED_FLAG:
1211 devfs_clr_related_flag_worker(msg->mdv_flags.dev,
1212 msg->mdv_flags.flag);
1214 case DEVFS_DESTROY_RELATED_WO_FLAG:
1215 devfs_destroy_related_without_flag_worker(msg->mdv_flags.dev,
1216 msg->mdv_flags.flag);
1218 case DEVFS_INODE_TO_VNODE:
1219 msg->mdv_ino.vp = devfs_iterate_topology(
1220 DEVFS_MNTDATA(msg->mdv_ino.mp)->root_node,
1221 (devfs_iterate_callback_t *)devfs_inode_to_vnode_worker_callback,
1224 case DEVFS_TERMINATE_CORE:
1230 devfs_debug(DEVFS_DEBUG_WARNING,
1231 "devfs_msg_core: unknown message "
1232 "received at core\n");
1235 lockmgr(&devfs_lock, LK_RELEASE);
1239 * Worker function to insert a new dev into the dev list and initialize its
1240 * permissions. It also calls devfs_propagate_dev which in turn propagates
1241 * the change to all mount points.
1243 * The passed dev is already referenced. This reference is eaten by this
1244 * function and represents the dev's linkage into devfs_dev_list.
1247 devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms)
1253 dev->si_perms = perms;
1255 devfs_link_dev(dev);
1256 devfs_propagate_dev(dev, 1);
1258 udev_event_attach(dev, NULL, 0);
1264 * Worker function to delete a dev from the dev list and free the cdev.
1265 * It also calls devfs_propagate_dev which in turn propagates the change
1266 * to all mount points.
1269 devfs_destroy_dev_worker(cdev_t dev)
1274 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1276 error = devfs_unlink_dev(dev);
1277 devfs_propagate_dev(dev, 0);
1279 udev_event_detach(dev, NULL, 0);
1282 release_dev(dev); /* link ref */
1290 * Worker function to destroy all devices with a certain basename.
1291 * Calls devfs_destroy_dev_worker for the actual destruction.
1294 devfs_destroy_related_worker(cdev_t needle)
1299 devfs_debug(DEVFS_DEBUG_DEBUG, "related worker: %s\n",
1301 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1302 if (dev->si_parent == needle) {
1303 devfs_destroy_related_worker(dev);
1304 devfs_destroy_dev_worker(dev);
1312 devfs_clr_related_flag_worker(cdev_t needle, uint32_t flag)
1316 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1317 if (dev->si_parent == needle) {
1318 devfs_clr_related_flag_worker(dev, flag);
1319 dev->si_flags &= ~flag;
1327 devfs_destroy_related_without_flag_worker(cdev_t needle, uint32_t flag)
1332 devfs_debug(DEVFS_DEBUG_DEBUG, "related_wo_flag: %s\n",
1335 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1336 if (dev->si_parent == needle) {
1337 devfs_destroy_related_without_flag_worker(dev, flag);
1338 if (!(dev->si_flags & flag)) {
1339 devfs_destroy_dev_worker(dev);
1340 devfs_debug(DEVFS_DEBUG_DEBUG,
1341 "related_wo_flag: %s restart\n", dev->si_name);
1351 * Worker function that creates all device nodes on top of a devfs
1355 devfs_create_all_dev_worker(struct devfs_node *root)
1361 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1362 devfs_create_device_node(root, dev, NULL, NULL);
1369 * Worker function that destroys all devices that match a specific
1370 * dev_ops and/or minor. If minor is less than 0, it is not matched
1371 * against. It also propagates all changes.
1374 devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor)
1380 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1381 if (dev->si_ops != ops)
1383 if ((minor < 0) || (dev->si_uminor == minor)) {
1384 devfs_destroy_dev_worker(dev);
1392 * Worker function that registers a new clone handler in devfs.
1395 devfs_chandler_add_worker(const char *name, d_clone_t *nhandler)
1397 struct devfs_clone_handler *chandler = NULL;
1398 u_char len = strlen(name);
1403 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1404 if (chandler->namlen != len)
1407 if (!memcmp(chandler->name, name, len)) {
1408 /* Clonable basename already exists */
1413 chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO);
1414 chandler->name = kstrdup(name, M_DEVFS);
1415 chandler->namlen = len;
1416 chandler->nhandler = nhandler;
1418 TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link);
1423 * Worker function that removes a given clone handler from the
1424 * clone handler list.
1427 devfs_chandler_del_worker(const char *name)
1429 struct devfs_clone_handler *chandler, *chandler2;
1430 u_char len = strlen(name);
1435 TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) {
1436 if (chandler->namlen != len)
1438 if (memcmp(chandler->name, name, len))
1441 TAILQ_REMOVE(&devfs_chandler_list, chandler, link);
1442 kfree(chandler->name, M_DEVFS);
1443 kfree(chandler, M_DEVFS);
1451 * Worker function that finds a given device name and changes
1452 * the message received accordingly so that when replied to,
1453 * the answer is returned to the caller.
1456 devfs_find_device_by_name_worker(devfs_msg_t devfs_msg)
1458 struct devfs_alias *alias;
1460 cdev_t found = NULL;
1462 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1463 if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) {
1468 if (found == NULL) {
1469 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1470 if (strcmp(devfs_msg->mdv_name, alias->name) == 0) {
1471 found = alias->dev_target;
1476 devfs_msg->mdv_cdev = found;
1482 * Worker function that finds a given device udev and changes
1483 * the message received accordingly so that when replied to,
1484 * the answer is returned to the caller.
1487 devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg)
1490 cdev_t found = NULL;
1492 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1493 if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) {
1498 devfs_msg->mdv_cdev = found;
1504 * Worker function that inserts a given alias into the
1505 * alias list, and propagates the alias to all mount
1509 devfs_make_alias_worker(struct devfs_alias *alias)
1511 struct devfs_alias *alias2;
1512 size_t len = strlen(alias->name);
1515 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1516 if (len != alias2->namlen)
1519 if (!memcmp(alias->name, alias2->name, len)) {
1527 * The alias doesn't exist yet, so we add it to the alias list
1529 TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link);
1530 devfs_alias_propagate(alias, 0);
1531 udev_event_attach(alias->dev_target, alias->name, 1);
1533 devfs_debug(DEVFS_DEBUG_WARNING,
1534 "Warning: duplicate devfs_make_alias for %s\n",
1536 kfree(alias->name, M_DEVFS);
1537 kfree(alias, M_DEVFS);
1544 * Worker function that delete a given alias from the
1545 * alias list, and propagates the removal to all mount
1549 devfs_destroy_alias_worker(struct devfs_alias *alias)
1551 struct devfs_alias *alias2;
1554 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1555 if (alias->dev_target != alias2->dev_target)
1558 if (devfs_WildCmp(alias->name, alias2->name) == 0) {
1565 devfs_debug(DEVFS_DEBUG_WARNING,
1566 "Warning: devfs_destroy_alias for inexistant alias: %s\n",
1568 kfree(alias->name, M_DEVFS);
1569 kfree(alias, M_DEVFS);
1572 * The alias exists, so we delete it from the alias list
1574 TAILQ_REMOVE(&devfs_alias_list, alias2, link);
1575 devfs_alias_propagate(alias2, 1);
1576 udev_event_detach(alias2->dev_target, alias2->name, 1);
1577 kfree(alias->name, M_DEVFS);
1578 kfree(alias, M_DEVFS);
1579 kfree(alias2->name, M_DEVFS);
1580 kfree(alias2, M_DEVFS);
1587 * Function that removes and frees all aliases.
1590 devfs_alias_reap(void)
1592 struct devfs_alias *alias, *alias2;
1594 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1595 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1596 kfree(alias->name, M_DEVFS);
1597 kfree(alias, M_DEVFS);
1603 * Function that removes an alias matching a specific cdev and frees
1607 devfs_alias_remove(cdev_t dev)
1609 struct devfs_alias *alias, *alias2;
1611 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1612 if (alias->dev_target == dev) {
1613 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1614 udev_event_detach(alias->dev_target, alias->name, 1);
1615 kfree(alias->name, M_DEVFS);
1616 kfree(alias, M_DEVFS);
1623 * This function propagates an alias addition or removal to
1627 devfs_alias_propagate(struct devfs_alias *alias, int remove)
1629 struct devfs_mnt_data *mnt;
1631 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1633 devfs_destroy_node(mnt->root_node, alias->name);
1635 devfs_alias_apply(mnt->root_node, alias);
1642 * This function is a recursive function iterating through
1643 * all device nodes in the topology and, if applicable,
1644 * creating the relevant alias for a device node.
1647 devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias)
1649 struct devfs_node *node1, *node2;
1651 KKASSERT(alias != NULL);
1653 if ((node->node_type == Nroot) || (node->node_type == Ndir)) {
1654 if (node->nchildren > 2) {
1655 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
1656 devfs_alias_apply(node1, alias);
1660 if (node->d_dev == alias->dev_target)
1661 devfs_alias_create(alias->name, node, 0);
1667 * This function checks if any alias possibly is applicable
1668 * to the given node. If so, the alias is created.
1671 devfs_alias_check_create(struct devfs_node *node)
1673 struct devfs_alias *alias;
1675 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1676 if (node->d_dev == alias->dev_target)
1677 devfs_alias_create(alias->name, node, 0);
1683 * This function creates an alias with a given name
1684 * linking to a given devfs node. It also increments
1685 * the link count on the target node.
1688 devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based)
1690 struct mount *mp = target->mp;
1691 struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node;
1692 struct devfs_node *linknode;
1693 char *create_path = NULL;
1698 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1700 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1701 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name);
1704 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1707 if (devfs_find_device_node_by_name(parent, name)) {
1708 devfs_debug(DEVFS_DEBUG_WARNING,
1709 "Node already exists: %s "
1710 "(devfs_make_alias_worker)!\n",
1716 linknode = devfs_allocp(Nlink, name, parent, mp, NULL);
1717 if (linknode == NULL) {
1722 linknode->link_target = target;
1726 linknode->flags |= DEVFS_RULE_CREATED;
1729 kfree(name_buf, M_TEMP);
1734 * This function is called by the core and handles mount point
1735 * strings. It either calls the relevant worker (devfs_apply_
1736 * reset_rules_worker) on all mountpoints or only a specific
1740 devfs_apply_reset_rules_caller(char *mountto, int apply)
1742 struct devfs_mnt_data *mnt;
1744 if (mountto[0] == '*') {
1745 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1746 devfs_iterate_topology(mnt->root_node,
1747 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1751 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1752 if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) {
1753 devfs_iterate_topology(mnt->root_node,
1754 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1761 kfree(mountto, M_DEVFS);
1766 * This function calls a given callback function for
1767 * every dev node in the devfs dev list.
1770 devfs_scan_callback_worker(devfs_scan_t *callback, void *arg)
1773 struct devfs_alias *alias, *alias1;
1775 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1776 callback(dev->si_name, dev, false, arg);
1778 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias1) {
1779 callback(alias->name, alias->dev_target, true, arg);
1786 * This function tries to resolve a given directory, or if not
1787 * found and creation requested, creates the given directory.
1789 static struct devfs_node *
1790 devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name,
1791 size_t name_len, int create)
1793 struct devfs_node *node, *found = NULL;
1795 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1796 if (name_len != node->d_dir.d_namlen)
1799 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) {
1805 if ((found == NULL) && (create)) {
1806 found = devfs_allocp(Ndir, dir_name, parent, parent->mp, NULL);
1813 * This function tries to resolve a complete path. If creation is requested,
1814 * if a given part of the path cannot be resolved (because it doesn't exist),
1818 devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create)
1820 struct devfs_node *node = parent;
1827 buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1829 while (*path && idx < PATH_MAX - 1) {
1834 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1844 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1845 kfree (buf, M_TEMP);
1850 * Takes a full path and strips it into a directory path and a name.
1851 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It
1852 * requires a working buffer with enough size to keep the whole
1856 devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep)
1860 size_t len = strlen(fullpath) + 1;
1863 KKASSERT((fullpath != NULL) && (buf != NULL));
1864 KKASSERT((pathp != NULL) && (namep != NULL));
1866 memcpy(buf, fullpath, len);
1868 for (i = len-1; i>= 0; i--) {
1869 if (buf[i] == '/') {
1889 * This function creates a new devfs node for a given device. It can
1890 * handle a complete path as device name, and accordingly creates
1891 * the path and the final device node.
1893 * The reference count on the passed dev remains unchanged.
1896 devfs_create_device_node(struct devfs_node *root, cdev_t dev,
1897 char *dev_name, char *path_fmt, ...)
1899 struct devfs_node *parent, *node = NULL;
1905 char *create_path = NULL;
1906 char *names = "pqrsPQRS";
1908 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1910 if (path_fmt != NULL) {
1911 __va_start(ap, path_fmt);
1912 kvasnrprintf(&path, PATH_MAX, 10, path_fmt, ap);
1916 parent = devfs_resolve_or_create_path(root, path, 1);
1919 devfs_resolve_name_path(
1920 ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name),
1921 name_buf, &create_path, &name);
1924 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1927 if (devfs_find_device_node_by_name(parent, name)) {
1928 devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: "
1929 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name);
1933 node = devfs_allocp(Ndev, name, parent, parent->mp, dev);
1934 nanotime(&parent->mtime);
1937 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their
1940 if ((dev) && (strlen(dev->si_name) >= 4) &&
1941 (!memcmp(dev->si_name, "ptm/", 4))) {
1942 node->parent->flags |= DEVFS_HIDDEN;
1943 node->flags |= DEVFS_HIDDEN;
1947 * Ugly pty magic, to tag pty devices as such and hide them if needed.
1949 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3)))
1950 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1952 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) {
1954 for (i = 0; i < strlen(names); i++) {
1955 if (name[3] == names[i]) {
1961 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1965 kfree(name_buf, M_TEMP);
1971 * This function finds a given device node in the topology with a given
1975 devfs_find_device_node_callback(struct devfs_node *node, cdev_t target)
1977 if ((node->node_type == Ndev) && (node->d_dev == target)) {
1985 * This function finds a device node in the given parent directory by its
1986 * name and returns it.
1989 devfs_find_device_node_by_name(struct devfs_node *parent, char *target)
1991 struct devfs_node *node, *found = NULL;
1992 size_t len = strlen(target);
1994 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1995 if (len != node->d_dir.d_namlen)
1998 if (!memcmp(node->d_dir.d_name, target, len)) {
2008 devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop)
2010 struct vnode *vp = NULL;
2011 ino_t target = *inop;
2013 if (node->d_dir.d_ino == target) {
2016 vget(vp, LK_EXCLUSIVE | LK_RETRY);
2019 devfs_allocv(&vp, node);
2028 * This function takes a cdev and removes its devfs node in the
2029 * given topology. The cdev remains intact.
2032 devfs_destroy_device_node(struct devfs_node *root, cdev_t target)
2034 KKASSERT(target != NULL);
2035 return devfs_destroy_node(root, target->si_name);
2039 * This function takes a path to a devfs node, resolves it and
2040 * removes the devfs node from the given topology.
2043 devfs_destroy_node(struct devfs_node *root, char *target)
2045 struct devfs_node *node, *parent;
2048 char *create_path = NULL;
2052 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
2053 ksnprintf(name_buf, PATH_MAX, "%s", target);
2055 devfs_resolve_name_path(target, name_buf, &create_path, &name);
2058 parent = devfs_resolve_or_create_path(root, create_path, 0);
2062 if (parent == NULL) {
2063 kfree(name_buf, M_TEMP);
2067 node = devfs_find_device_node_by_name(parent, name);
2070 nanotime(&node->parent->mtime);
2074 kfree(name_buf, M_TEMP);
2080 * Just set perms and ownership for given node.
2083 devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid,
2084 u_short mode, u_long flags)
2094 * Propagates a device attach/detach to all mount
2095 * points. Also takes care of automatic alias removal
2096 * for a deleted cdev.
2099 devfs_propagate_dev(cdev_t dev, int attach)
2101 struct devfs_mnt_data *mnt;
2103 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
2105 /* Device is being attached */
2106 devfs_create_device_node(mnt->root_node, dev,
2109 /* Device is being detached */
2110 devfs_alias_remove(dev);
2111 devfs_destroy_device_node(mnt->root_node, dev);
2118 * devfs_clone either returns a basename from a complete name by
2119 * returning the length of the name without trailing digits, or,
2120 * if clone != 0, calls the device's clone handler to get a new
2121 * device, which in turn is returned in devp.
2124 devfs_clone(cdev_t dev, const char *name, size_t len, int mode,
2128 struct devfs_clone_handler *chandler;
2129 struct dev_clone_args ap;
2131 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
2132 if (chandler->namlen != len)
2134 if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) {
2135 lockmgr(&devfs_lock, LK_RELEASE);
2137 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2139 ap.a_head.a_dev = dev;
2145 error = (chandler->nhandler)(&ap);
2158 * Registers a new orphan in the orphan list.
2161 devfs_tracer_add_orphan(struct devfs_node *node)
2163 struct devfs_orphan *orphan;
2166 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK);
2167 orphan->node = node;
2169 KKASSERT((node->flags & DEVFS_ORPHANED) == 0);
2170 node->flags |= DEVFS_ORPHANED;
2171 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link);
2175 * Removes an orphan from the orphan list.
2178 devfs_tracer_del_orphan(struct devfs_node *node)
2180 struct devfs_orphan *orphan;
2184 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) {
2185 if (orphan->node == node) {
2186 node->flags &= ~DEVFS_ORPHANED;
2187 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link);
2188 kfree(orphan, M_DEVFS);
2195 * Counts the orphans in the orphan list, and if cleanup
2196 * is specified, also frees the orphan and removes it from
2200 devfs_tracer_orphan_count(struct mount *mp, int cleanup)
2202 struct devfs_orphan *orphan, *orphan2;
2205 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) {
2208 * If we are instructed to clean up, we do so.
2211 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link);
2212 orphan->node->flags &= ~DEVFS_ORPHANED;
2213 devfs_freep(orphan->node);
2214 kfree(orphan, M_DEVFS);
2222 * Fetch an ino_t from the global d_ino by increasing it
2226 devfs_fetch_ino(void)
2230 spin_lock(&ino_lock);
2232 spin_unlock(&ino_lock);
2238 * Allocates a new cdev and initializes it's most basic
2242 devfs_new_cdev(struct dev_ops *ops, int minor, struct dev_ops *bops)
2244 cdev_t dev = sysref_alloc(&cdev_sysref_class);
2246 sysref_activate(&dev->si_sysref);
2248 bzero(dev, offsetof(struct cdev, si_sysref));
2253 dev->si_drv1 = NULL;
2254 dev->si_drv2 = NULL;
2255 dev->si_lastread = 0; /* time_second */
2256 dev->si_lastwrite = 0; /* time_second */
2258 dev->si_dict = NULL;
2259 dev->si_parent = NULL;
2262 dev->si_uminor = minor;
2263 dev->si_bops = bops;
2266 * Since the disk subsystem is in the way, we need to
2267 * propagate the D_CANFREE from bops (and ops) to
2270 if (bops && (bops->head.flags & D_CANFREE)) {
2271 dev->si_flags |= SI_CANFREE;
2272 } else if (ops->head.flags & D_CANFREE) {
2273 dev->si_flags |= SI_CANFREE;
2276 /* If there is a backing device, we reference its ops */
2277 dev->si_inode = makeudev(
2278 devfs_reference_ops((bops)?(bops):(ops)),
2280 dev->si_umajor = umajor(dev->si_inode);
2286 devfs_cdev_terminate(cdev_t dev)
2290 /* Check if it is locked already. if not, we acquire the devfs lock */
2291 if ((lockstatus(&devfs_lock, curthread)) != LK_EXCLUSIVE) {
2292 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2297 * Make sure the node isn't linked anymore. Otherwise we've screwed
2298 * up somewhere, since normal devs are unlinked on the call to
2299 * destroy_dev and only-cdevs that have not been used for cloning
2300 * are not linked in the first place. only-cdevs used for cloning
2301 * will be linked in, too, and should only be destroyed via
2302 * destroy_dev, not destroy_only_dev, so we catch that problem, too.
2304 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
2306 /* If we acquired the lock, we also get rid of it */
2308 lockmgr(&devfs_lock, LK_RELEASE);
2310 /* If there is a backing device, we release the backing device's ops */
2311 devfs_release_ops((dev->si_bops)?(dev->si_bops):(dev->si_ops));
2313 /* Finally destroy the device */
2314 sysref_put(&dev->si_sysref);
2318 * Dummies for now (individual locks for MPSAFE)
2321 devfs_cdev_lock(cdev_t dev)
2326 devfs_cdev_unlock(cdev_t dev)
2331 devfs_detached_filter_eof(struct knote *kn, long hint)
2333 kn->kn_flags |= (EV_EOF | EV_NODATA);
2338 devfs_detached_filter_detach(struct knote *kn)
2340 cdev_t dev = (cdev_t)kn->kn_hook;
2342 knote_remove(&dev->si_kqinfo.ki_note, kn);
2345 static struct filterops devfs_detached_filterops =
2346 { FILTEROP_ISFD, NULL,
2347 devfs_detached_filter_detach,
2348 devfs_detached_filter_eof };
2351 * Delegates knote filter handling responsibility to devfs
2353 * Any device that implements kqfilter event handling and could be detached
2354 * or shut down out from under the kevent subsystem must allow devfs to
2355 * assume responsibility for any knotes it may hold.
2358 devfs_assume_knotes(cdev_t dev, struct kqinfo *kqi)
2361 * Let kern/kern_event.c do the heavy lifting.
2363 knote_assume_knotes(kqi, &dev->si_kqinfo,
2364 &devfs_detached_filterops, (void *)dev);
2367 * These should probably be activated individually, but doing so
2368 * would require refactoring kq's public in-kernel interface.
2370 KNOTE(&dev->si_kqinfo.ki_note, 0);
2374 * Links a given cdev into the dev list.
2377 devfs_link_dev(cdev_t dev)
2379 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
2380 dev->si_flags |= SI_DEVFS_LINKED;
2381 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link);
2387 * Removes a given cdev from the dev list. The caller is responsible for
2388 * releasing the reference on the device associated with the linkage.
2390 * Returns EALREADY if the dev has already been unlinked.
2393 devfs_unlink_dev(cdev_t dev)
2395 if ((dev->si_flags & SI_DEVFS_LINKED)) {
2396 TAILQ_REMOVE(&devfs_dev_list, dev, link);
2397 dev->si_flags &= ~SI_DEVFS_LINKED;
2404 devfs_node_is_accessible(struct devfs_node *node)
2406 if ((node) && (!(node->flags & DEVFS_HIDDEN)))
2413 devfs_reference_ops(struct dev_ops *ops)
2416 struct devfs_dev_ops *found = NULL;
2417 struct devfs_dev_ops *devops;
2419 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2420 if (devops->ops == ops) {
2427 found = kmalloc(sizeof(struct devfs_dev_ops), M_DEVFS, M_WAITOK);
2429 found->ref_count = 0;
2430 TAILQ_INSERT_TAIL(&devfs_dev_ops_list, found, link);
2435 if (found->ref_count == 0) {
2436 found->id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255);
2437 if (found->id == -1) {
2438 /* Ran out of unique ids */
2439 devfs_debug(DEVFS_DEBUG_WARNING,
2440 "devfs_reference_ops: WARNING: ran out of unique ids\n");
2450 devfs_release_ops(struct dev_ops *ops)
2452 struct devfs_dev_ops *found = NULL;
2453 struct devfs_dev_ops *devops;
2455 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2456 if (devops->ops == ops) {
2466 if (found->ref_count == 0) {
2467 TAILQ_REMOVE(&devfs_dev_ops_list, found, link);
2468 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), found->id);
2469 kfree(found, M_DEVFS);
2474 * Wait for asynchronous messages to complete in the devfs helper
2475 * thread, then return. Do nothing if the helper thread is dead
2476 * or we are being indirectly called from the helper thread itself.
2483 if (devfs_run && curthread != td_core) {
2484 msg = devfs_msg_get();
2485 msg = devfs_msg_send_sync(DEVFS_SYNC, msg);
2491 * Called on init of devfs; creates the objcaches and
2492 * spawns off the devfs core thread. Also initializes
2498 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n");
2499 /* Create objcaches for nodes, msgs and devs */
2500 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0,
2502 objcache_malloc_alloc,
2503 objcache_malloc_free,
2504 &devfs_node_malloc_args );
2506 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0,
2508 objcache_malloc_alloc,
2509 objcache_malloc_free,
2510 &devfs_msg_malloc_args );
2512 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0,
2514 objcache_malloc_alloc,
2515 objcache_malloc_free,
2516 &devfs_dev_malloc_args );
2518 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id));
2520 /* Initialize the reply-only port which acts as a message drain */
2521 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply);
2523 /* Initialize *THE* devfs lock */
2524 lockinit(&devfs_lock, "devfs_core lock", 0, 0);
2526 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2527 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL,
2528 0, -1, "devfs_msg_core");
2529 while (devfs_run == 0)
2530 lksleep(td_core, &devfs_lock, 0, "devfsc", 0);
2531 lockmgr(&devfs_lock, LK_RELEASE);
2533 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n");
2537 * Called on unload of devfs; takes care of destroying the core
2538 * and the objcaches. Also removes aliases that are no longer needed.
2543 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
2545 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL);
2547 tsleep(td_core, 0, "devfsc", hz*10);
2548 tsleep(td_core, 0, "devfsc", hz);
2550 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id));
2552 /* Destroy the objcaches */
2553 objcache_destroy(devfs_msg_cache);
2554 objcache_destroy(devfs_node_cache);
2555 objcache_destroy(devfs_dev_cache);
2561 * This is a sysctl handler to assist userland devname(3) to
2562 * find the device name for a given udev.
2565 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS)
2572 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t))))
2575 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev);
2580 if ((found = devfs_find_device_by_udev(udev)) == NULL)
2583 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1));
2587 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
2588 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)");
2590 SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
2591 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable);
2592 SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable,
2593 0, "Enable DevFS debugging");
2595 SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST,
2597 SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY,
2598 devfs_uninit, NULL);
2601 * WildCmp() - compare wild string to sane string
2603 * Returns 0 on success, -1 on failure.
2606 wildCmp(const char **mary, int d, const char *w, const char *s)
2611 * skip fixed portion
2617 * optimize terminator
2621 if (w[1] != '?' && w[1] != '*') {
2623 * optimize * followed by non-wild
2625 for (i = 0; s + i < mary[d]; ++i) {
2626 if (s[i] == w[1] && wildCmp(mary, d + 1, w + 1, s + i) == 0)
2633 for (i = 0; s + i < mary[d]; ++i) {
2634 if (wildCmp(mary, d + 1, w + 1, s + i) == 0)
2649 if (*w == 0) /* terminator */
2662 * WildCaseCmp() - compare wild string to sane string, case insensitive
2664 * Returns 0 on success, -1 on failure.
2667 wildCaseCmp(const char **mary, int d, const char *w, const char *s)
2672 * skip fixed portion
2678 * optimize terminator
2682 if (w[1] != '?' && w[1] != '*') {
2684 * optimize * followed by non-wild
2686 for (i = 0; s + i < mary[d]; ++i) {
2687 if (s[i] == w[1] && wildCaseCmp(mary, d + 1, w + 1, s + i) == 0)
2694 for (i = 0; s + i < mary[d]; ++i) {
2695 if (wildCaseCmp(mary, d + 1, w + 1, s + i) == 0)
2709 #define tolower(x) ((x >= 'A' && x <= 'Z')?(x+('a'-'A')):(x))
2710 if (tolower(*w) != tolower(*s))
2713 if (*w == 0) /* terminator */
2725 devfs_WildCmp(const char *w, const char *s)
2729 int slen = strlen(s);
2732 for (i = c = 0; w[i]; ++i) {
2736 mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK);
2737 for (i = 0; i < c; ++i)
2739 i = wildCmp(mary, 0, w, s);
2740 kfree(mary, M_DEVFS);
2745 devfs_WildCaseCmp(const char *w, const char *s)
2749 int slen = strlen(s);
2752 for (i = c = 0; w[i]; ++i) {
2756 mary = kmalloc(sizeof(char *) * (c + 1), M_DEVFS, M_WAITOK);
2757 for (i = 0; i < c; ++i)
2759 i = wildCaseCmp(mary, 0, w, s);
2760 kfree(mary, M_DEVFS);