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/msgport2.h>
43 #include <sys/spinlock2.h>
44 #include <sys/sysctl.h>
45 #include <sys/ucred.h>
46 #include <sys/param.h>
47 #include <sys/sysref2.h>
48 #include <sys/systm.h>
49 #include <sys/devfs.h>
50 #include <sys/devfs_rules.h>
51 #include <sys/hotplug.h>
54 MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations");
55 DEVFS_DECLARE_CLONE_BITMAP(ops_id);
57 * SYSREF Integration - reference counting, allocation,
58 * sysid and syslink integration.
60 static void devfs_cdev_terminate(cdev_t dev);
61 static void devfs_cdev_lock(cdev_t dev);
62 static void devfs_cdev_unlock(cdev_t dev);
63 static struct sysref_class cdev_sysref_class = {
66 .proto = SYSREF_PROTO_DEV,
67 .offset = offsetof(struct cdev, si_sysref),
68 .objsize = sizeof(struct cdev),
72 .terminate = (sysref_terminate_func_t)devfs_cdev_terminate,
73 .lock = (sysref_lock_func_t)devfs_cdev_lock,
74 .unlock = (sysref_unlock_func_t)devfs_cdev_unlock
78 static struct objcache *devfs_node_cache;
79 static struct objcache *devfs_msg_cache;
80 static struct objcache *devfs_dev_cache;
82 static struct objcache_malloc_args devfs_node_malloc_args = {
83 sizeof(struct devfs_node), M_DEVFS };
84 struct objcache_malloc_args devfs_msg_malloc_args = {
85 sizeof(struct devfs_msg), M_DEVFS };
86 struct objcache_malloc_args devfs_dev_malloc_args = {
87 sizeof(struct cdev), M_DEVFS };
89 static struct devfs_dev_head devfs_dev_list =
90 TAILQ_HEAD_INITIALIZER(devfs_dev_list);
91 static struct devfs_mnt_head devfs_mnt_list =
92 TAILQ_HEAD_INITIALIZER(devfs_mnt_list);
93 static struct devfs_chandler_head devfs_chandler_list =
94 TAILQ_HEAD_INITIALIZER(devfs_chandler_list);
95 static struct devfs_alias_head devfs_alias_list =
96 TAILQ_HEAD_INITIALIZER(devfs_alias_list);
97 static struct devfs_dev_ops_head devfs_dev_ops_list =
98 TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list);
100 struct lock devfs_lock;
101 static struct lwkt_port devfs_dispose_port;
102 static struct lwkt_port devfs_msg_port;
103 static struct thread *td_core;
105 static struct spinlock ino_lock;
107 static int devfs_debug_enable;
108 static int devfs_run;
110 static ino_t devfs_fetch_ino(void);
111 static int devfs_create_all_dev_worker(struct devfs_node *);
112 static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int);
113 static int devfs_destroy_dev_worker(cdev_t);
114 static int devfs_destroy_subnames_worker(char *);
115 static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int);
116 static int devfs_propagate_dev(cdev_t, int);
117 static int devfs_unlink_dev(cdev_t dev);
118 static void devfs_msg_exec(devfs_msg_t msg);
120 static int devfs_chandler_add_worker(const char *, d_clone_t *);
121 static int devfs_chandler_del_worker(const char *);
123 static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
124 static void devfs_msg_core(void *);
126 static int devfs_find_device_by_name_worker(devfs_msg_t);
127 static int devfs_find_device_by_udev_worker(devfs_msg_t);
129 static int devfs_apply_reset_rules_caller(char *, int);
131 static int devfs_scan_callback_worker(devfs_scan_t *, void *);
133 static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *,
134 char *, size_t, int);
136 static int devfs_make_alias_worker(struct devfs_alias *);
137 static int devfs_alias_remove(cdev_t);
138 static int devfs_alias_reap(void);
139 static int devfs_alias_propagate(struct devfs_alias *);
140 static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *);
141 static int devfs_alias_check_create(struct devfs_node *);
143 static int devfs_clr_subnames_flag_worker(char *, uint32_t);
144 static int devfs_destroy_subnames_without_flag_worker(char *, uint32_t);
146 static void *devfs_reaperp_callback(struct devfs_node *, void *);
147 static void *devfs_gc_dirs_callback(struct devfs_node *, void *);
148 static void *devfs_gc_links_callback(struct devfs_node *, struct devfs_node *);
150 devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *);
153 void (*devfs_node_added)(struct hotplug_device*) = NULL;
154 void (*devfs_node_removed)(struct hotplug_device*) = NULL;
157 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function
161 devfs_debug(int level, char *fmt, ...)
166 if (level <= devfs_debug_enable)
174 * devfs_allocp() Allocates a new devfs node with the specified
175 * parameters. The node is also automatically linked into the topology
176 * if a parent is specified. It also calls the rule and alias stuff to
177 * be applied on the new node
180 devfs_allocp(devfs_nodetype devfsnodetype, char *name,
181 struct devfs_node *parent, struct mount *mp, cdev_t dev)
183 struct devfs_node *node = NULL;
184 size_t namlen = strlen(name);
186 node = objcache_get(devfs_node_cache, M_WAITOK);
187 bzero(node, sizeof(*node));
189 atomic_add_long(&(DEVFS_MNTDATA(mp)->leak_count), 1);
194 node->d_dir.d_ino = devfs_fetch_ino();
197 * Cookie jar for children. Leave 0 and 1 for '.' and '..' entries
200 node->cookie_jar = 2;
203 * Access Control members
205 node->mode = DEVFS_DEFAULT_MODE;
206 node->uid = DEVFS_DEFAULT_UID;
207 node->gid = DEVFS_DEFAULT_GID;
209 switch (devfsnodetype) {
212 * Ensure that we don't recycle the root vnode by marking it as
213 * linked into the topology.
215 node->flags |= DEVFS_NODE_LINKED;
217 TAILQ_INIT(DEVFS_DENODE_HEAD(node));
218 node->d_dir.d_type = DT_DIR;
223 node->d_dir.d_type = DT_LNK;
227 node->d_dir.d_type = DT_REG;
232 node->d_dir.d_type = DT_CHR;
235 node->mode = dev->si_perms;
236 node->uid = dev->si_uid;
237 node->gid = dev->si_gid;
239 devfs_alias_check_create(node);
244 panic("devfs_allocp: unknown node type");
248 node->node_type = devfsnodetype;
250 /* Initialize the dirent structure of each devfs vnode */
251 node->d_dir.d_namlen = namlen;
252 node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK);
253 memcpy(node->d_dir.d_name, name, namlen);
254 node->d_dir.d_name[namlen] = '\0';
256 /* Initialize the parent node element */
257 node->parent = parent;
260 devfs_rule_check_apply(node, NULL);
262 /* Initialize *time members */
263 nanotime(&node->atime);
264 node->mtime = node->ctime = node->atime;
267 * Associate with parent as last step, clean out namecache
270 if ((parent != NULL) &&
271 ((parent->node_type == Proot) || (parent->node_type == Pdir))) {
273 node->cookie = parent->cookie_jar++;
274 node->flags |= DEVFS_NODE_LINKED;
275 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link);
277 /* This forces negative namecache lookups to clear */
278 ++mp->mnt_namecache_gen;
281 ++DEVFS_MNTDATA(mp)->file_count;
287 * devfs_allocv() allocates a new vnode based on a devfs node.
290 devfs_allocv(struct vnode **vpp, struct devfs_node *node)
298 while ((vp = node->v_node) != NULL) {
299 error = vget(vp, LK_EXCLUSIVE);
300 if (error != ENOENT) {
306 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0)
311 if (node->v_node != NULL) {
320 switch (node->node_type) {
322 vsetflags(vp, VROOT);
338 KKASSERT(node->d_dev);
340 vp->v_uminor = node->d_dev->si_uminor;
343 v_associate_rdev(vp, node->d_dev);
344 vp->v_ops = &node->mp->mnt_vn_spec_ops;
348 panic("devfs_allocv: unknown node type");
356 * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode
357 * based on the newly created devfs node.
360 devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype,
361 char *name, struct devfs_node *parent, cdev_t dev)
363 struct devfs_node *node;
365 node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
368 devfs_allocv(vpp, node);
376 * Destroy the devfs_node. The node must be unlinked from the topology.
378 * This function will also destroy any vnode association with the node
381 * The cdev_t itself remains intact.
384 devfs_freep(struct devfs_node *node)
389 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) ||
390 (node->node_type == Proot));
391 KKASSERT((node->flags & DEVFS_DESTROYED) == 0);
393 atomic_subtract_long(&(DEVFS_MNTDATA(node->mp)->leak_count), 1);
394 if (node->symlink_name) {
395 kfree(node->symlink_name, M_DEVFS);
396 node->symlink_name = NULL;
400 * Remove the node from the orphan list if it is still on it.
402 if (node->flags & DEVFS_ORPHANED)
403 devfs_tracer_del_orphan(node);
406 * Disassociate the vnode from the node. This also prevents the
407 * vnode's reclaim code from double-freeing the node.
409 * The vget is needed to safely modify the vp. It also serves
410 * to cycle the refs and terminate the vnode if it happens to
411 * be inactive, otherwise namecache references may not get cleared.
413 while ((vp = node->v_node) != NULL) {
414 if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0)
419 cache_inval_vp(vp, CINV_DESTROY);
422 if (node->d_dir.d_name) {
423 kfree(node->d_dir.d_name, M_DEVFS);
424 node->d_dir.d_name = NULL;
426 node->flags |= DEVFS_DESTROYED;
428 --DEVFS_MNTDATA(node->mp)->file_count;
430 objcache_put(devfs_node_cache, node);
436 * Unlink the devfs node from the topology and add it to the orphan list.
437 * The node will later be destroyed by freep.
439 * Any vnode association, including the v_rdev and v_data, remains intact
443 devfs_unlinkp(struct devfs_node *node)
445 struct devfs_node *parent;
446 struct hotplug_device *hpdev;
450 * Add the node to the orphan list, so it is referenced somewhere, to
451 * so we don't leak it.
453 devfs_tracer_add_orphan(node);
455 parent = node->parent;
458 * If the parent is known we can unlink the node out of the topology
461 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
463 KKASSERT((parent->nchildren >= 0));
464 node->flags &= ~DEVFS_NODE_LINKED;
466 /* hotplug handler */
467 if(devfs_node_removed) {
468 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK);
469 hpdev->dev = node->d_dev;
471 hpdev->name = node->d_dev->si_name;
472 devfs_node_removed(hpdev);
473 kfree(hpdev, M_TEMP);
480 devfs_iterate_topology(struct devfs_node *node,
481 devfs_iterate_callback_t *callback, void *arg1)
483 struct devfs_node *node1, *node2;
486 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
487 if (node->nchildren > 2) {
488 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node),
490 if ((ret = devfs_iterate_topology(node1, callback, arg1)))
496 ret = callback(node, arg1);
501 * devfs_reaperp() is a recursive function that iterates through all the
502 * topology, unlinking and freeing all devfs nodes.
505 devfs_reaperp_callback(struct devfs_node *node, void *unused)
514 devfs_gc_dirs_callback(struct devfs_node *node, void *unused)
516 if (node->node_type == Pdir) {
517 if ((node->nchildren == 2) &&
518 !(node->flags & DEVFS_USER_CREATED)) {
528 devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target)
530 if ((node->node_type == Plink) && (node->link_target == target)) {
539 * devfs_gc() is devfs garbage collector. It takes care of unlinking and
540 * freeing a node, but also removes empty directories and links that link
541 * via devfs auto-link mechanism to the node being deleted.
544 devfs_gc(struct devfs_node *node)
546 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
548 if (node->nlinks > 0)
549 devfs_iterate_topology(root_node,
550 (devfs_iterate_callback_t *)devfs_gc_links_callback, node);
553 devfs_iterate_topology(root_node,
554 (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL);
562 * devfs_create_dev() is the asynchronous entry point for device creation.
563 * It just sends a message with the relevant details to the devfs core.
565 * This function will reference the passed device. The reference is owned
566 * by devfs and represents all of the device's node associations.
569 devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
572 devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
578 * devfs_destroy_dev() is the asynchronous entry point for device destruction.
579 * It just sends a message with the relevant details to the devfs core.
582 devfs_destroy_dev(cdev_t dev)
584 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
589 * devfs_mount_add() is the synchronous entry point for adding a new devfs
590 * mount. It sends a synchronous message with the relevant details to the
594 devfs_mount_add(struct devfs_mnt_data *mnt)
598 msg = devfs_msg_get();
600 msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg);
607 * devfs_mount_del() is the synchronous entry point for removing a devfs mount.
608 * It sends a synchronous message with the relevant details to the devfs core.
611 devfs_mount_del(struct devfs_mnt_data *mnt)
615 msg = devfs_msg_get();
617 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
624 * devfs_destroy_subnames() is the synchronous entry point for device
625 * destruction by subname. It just sends a message with the relevant details to
629 devfs_destroy_subnames(char *name)
633 msg = devfs_msg_get();
634 msg->mdv_load = name;
635 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES, msg);
641 devfs_clr_subnames_flag(char *name, uint32_t flag)
645 msg = devfs_msg_get();
646 msg->mdv_flags.name = name;
647 msg->mdv_flags.flag = flag;
648 msg = devfs_msg_send_sync(DEVFS_CLR_SUBNAMES_FLAG, msg);
655 devfs_destroy_subnames_without_flag(char *name, uint32_t flag)
659 msg = devfs_msg_get();
660 msg->mdv_flags.name = name;
661 msg->mdv_flags.flag = flag;
662 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES_WO_FLAG, msg);
669 * devfs_create_all_dev is the asynchronous entry point to trigger device
670 * node creation. It just sends a message with the relevant details to
674 devfs_create_all_dev(struct devfs_node *root)
676 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
681 * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all
682 * devices with a specific set of dev_ops and minor. It just sends a
683 * message with the relevant details to the devfs core.
686 devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor)
688 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor);
693 * devfs_clone_handler_add is the synchronous entry point to add a new
694 * clone handler. It just sends a message with the relevant details to
698 devfs_clone_handler_add(const char *name, d_clone_t *nhandler)
702 msg = devfs_msg_get();
703 msg->mdv_chandler.name = name;
704 msg->mdv_chandler.nhandler = nhandler;
705 msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg);
711 * devfs_clone_handler_del is the synchronous entry point to remove a
712 * clone handler. It just sends a message with the relevant details to
716 devfs_clone_handler_del(const char *name)
720 msg = devfs_msg_get();
721 msg->mdv_chandler.name = name;
722 msg->mdv_chandler.nhandler = NULL;
723 msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg);
729 * devfs_find_device_by_name is the synchronous entry point to find a
730 * device given its name. It sends a synchronous message with the
731 * relevant details to the devfs core and returns the answer.
734 devfs_find_device_by_name(const char *fmt, ...)
745 kvasnrprintf(&target, PATH_MAX, 10, fmt, ap);
748 msg = devfs_msg_get();
749 msg->mdv_name = target;
750 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
751 found = msg->mdv_cdev;
759 * devfs_find_device_by_udev is the synchronous entry point to find a
760 * device given its udev number. It sends a synchronous message with
761 * the relevant details to the devfs core and returns the answer.
764 devfs_find_device_by_udev(udev_t udev)
769 msg = devfs_msg_get();
770 msg->mdv_udev = udev;
771 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
772 found = msg->mdv_cdev;
775 devfs_debug(DEVFS_DEBUG_DEBUG,
776 "devfs_find_device_by_udev found? %s -end:3-\n",
777 ((found) ? found->si_name:"NO"));
782 devfs_inode_to_vnode(struct mount *mp, ino_t target)
784 struct vnode *vp = NULL;
790 msg = devfs_msg_get();
791 msg->mdv_ino.mp = mp;
792 msg->mdv_ino.ino = target;
793 msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg);
794 vp = msg->mdv_ino.vp;
795 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
802 * devfs_make_alias is the asynchronous entry point to register an alias
803 * for a device. It just sends a message with the relevant details to the
807 devfs_make_alias(const char *name, cdev_t dev_target)
809 struct devfs_alias *alias;
814 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
815 alias->name = kstrdup(name, M_DEVFS);
817 alias->dev_target = dev_target;
819 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
824 * devfs_apply_rules is the asynchronous entry point to trigger application
825 * of all rules. It just sends a message with the relevant details to the
829 devfs_apply_rules(char *mntto)
833 new_name = kstrdup(mntto, M_DEVFS);
834 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
840 * devfs_reset_rules is the asynchronous entry point to trigger reset of all
841 * rules. It just sends a message with the relevant details to the devfs core.
844 devfs_reset_rules(char *mntto)
848 new_name = kstrdup(mntto, M_DEVFS);
849 devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
856 * devfs_scan_callback is the asynchronous entry point to call a callback
858 * It just sends a message with the relevant details to the devfs core.
861 devfs_scan_callback(devfs_scan_t *callback, void *arg)
865 KKASSERT(sizeof(callback) == sizeof(void *));
867 msg = devfs_msg_get();
868 msg->mdv_load = callback;
869 msg->mdv_load2 = arg;
870 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
878 * Acts as a message drain. Any message that is replied to here gets destroyed
879 * and the memory freed.
882 devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
884 devfs_msg_put((devfs_msg_t)msg);
888 * devfs_msg_get allocates a new devfs msg and returns it.
893 return objcache_get(devfs_msg_cache, M_WAITOK);
897 * devfs_msg_put deallocates a given devfs msg.
900 devfs_msg_put(devfs_msg_t msg)
902 objcache_put(devfs_msg_cache, msg);
907 * devfs_msg_send is the generic asynchronous message sending facility
908 * for devfs. By default the reply port is the automatic disposal port.
910 * If the current thread is the devfs_msg_port thread we execute the
911 * operation synchronously.
914 devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
916 lwkt_port_t port = &devfs_msg_port;
918 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
920 devfs_msg->hdr.u.ms_result = cmd;
922 if (port->mpu_td == curthread) {
923 devfs_msg_exec(devfs_msg);
924 lwkt_replymsg(&devfs_msg->hdr, 0);
926 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
931 * devfs_msg_send_sync is the generic synchronous message sending
932 * facility for devfs. It initializes a local reply port and waits
933 * for the core's answer. This answer is then returned.
936 devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg)
938 struct lwkt_port rep_port;
939 devfs_msg_t msg_incoming;
940 lwkt_port_t port = &devfs_msg_port;
942 lwkt_initport_thread(&rep_port, curthread);
943 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
945 devfs_msg->hdr.u.ms_result = cmd;
947 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
948 msg_incoming = lwkt_waitport(&rep_port, 0);
954 * sends a message with a generic argument.
957 devfs_msg_send_generic(uint32_t cmd, void *load)
959 devfs_msg_t devfs_msg = devfs_msg_get();
961 devfs_msg->mdv_load = load;
962 devfs_msg_send(cmd, devfs_msg);
966 * sends a message with a name argument.
969 devfs_msg_send_name(uint32_t cmd, char *name)
971 devfs_msg_t devfs_msg = devfs_msg_get();
973 devfs_msg->mdv_name = name;
974 devfs_msg_send(cmd, devfs_msg);
978 * sends a message with a mount argument.
981 devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt)
983 devfs_msg_t devfs_msg = devfs_msg_get();
985 devfs_msg->mdv_mnt = mnt;
986 devfs_msg_send(cmd, devfs_msg);
990 * sends a message with an ops argument.
993 devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor)
995 devfs_msg_t devfs_msg = devfs_msg_get();
997 devfs_msg->mdv_ops.ops = ops;
998 devfs_msg->mdv_ops.minor = minor;
999 devfs_msg_send(cmd, devfs_msg);
1003 * sends a message with a clone handler argument.
1006 devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler)
1008 devfs_msg_t devfs_msg = devfs_msg_get();
1010 devfs_msg->mdv_chandler.name = name;
1011 devfs_msg->mdv_chandler.nhandler = handler;
1012 devfs_msg_send(cmd, devfs_msg);
1016 * sends a message with a device argument.
1019 devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms)
1021 devfs_msg_t devfs_msg = devfs_msg_get();
1023 devfs_msg->mdv_dev.dev = dev;
1024 devfs_msg->mdv_dev.uid = uid;
1025 devfs_msg->mdv_dev.gid = gid;
1026 devfs_msg->mdv_dev.perms = perms;
1028 devfs_msg_send(cmd, devfs_msg);
1032 * sends a message with a link argument.
1035 devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp)
1037 devfs_msg_t devfs_msg = devfs_msg_get();
1039 devfs_msg->mdv_link.name = name;
1040 devfs_msg->mdv_link.target = target;
1041 devfs_msg->mdv_link.mp = mp;
1042 devfs_msg_send(cmd, devfs_msg);
1046 * devfs_msg_core is the main devfs thread. It handles all incoming messages
1047 * and calls the relevant worker functions. By using messages it's assured
1048 * that events occur in the correct order.
1051 devfs_msg_core(void *arg)
1056 lwkt_initport_thread(&devfs_msg_port, curthread);
1060 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0);
1061 devfs_debug(DEVFS_DEBUG_DEBUG,
1062 "devfs_msg_core, new msg: %x\n",
1063 (unsigned int)msg->hdr.u.ms_result);
1064 devfs_msg_exec(msg);
1065 lwkt_replymsg(&msg->hdr, 0);
1072 devfs_msg_exec(devfs_msg_t msg)
1074 struct devfs_mnt_data *mnt;
1075 struct devfs_node *node;
1079 * Acquire the devfs lock to ensure safety of all called functions
1081 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1083 switch (msg->hdr.u.ms_result) {
1084 case DEVFS_DEVICE_CREATE:
1085 dev = msg->mdv_dev.dev;
1086 devfs_create_dev_worker(dev,
1089 msg->mdv_dev.perms);
1091 case DEVFS_DEVICE_DESTROY:
1092 dev = msg->mdv_dev.dev;
1093 devfs_destroy_dev_worker(dev);
1095 case DEVFS_DESTROY_SUBNAMES:
1096 devfs_destroy_subnames_worker(msg->mdv_load);
1098 case DEVFS_DESTROY_DEV_BY_OPS:
1099 devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops,
1100 msg->mdv_ops.minor);
1102 case DEVFS_CREATE_ALL_DEV:
1103 node = (struct devfs_node *)msg->mdv_load;
1104 devfs_create_all_dev_worker(node);
1106 case DEVFS_MOUNT_ADD:
1108 TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link);
1109 devfs_create_all_dev_worker(mnt->root_node);
1111 case DEVFS_MOUNT_DEL:
1113 TAILQ_REMOVE(&devfs_mnt_list, mnt, link);
1114 devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback,
1116 if (mnt->leak_count) {
1117 devfs_debug(DEVFS_DEBUG_SHOW,
1118 "Leaked %ld devfs_node elements!\n",
1122 case DEVFS_CHANDLER_ADD:
1123 devfs_chandler_add_worker(msg->mdv_chandler.name,
1124 msg->mdv_chandler.nhandler);
1126 case DEVFS_CHANDLER_DEL:
1127 devfs_chandler_del_worker(msg->mdv_chandler.name);
1129 case DEVFS_FIND_DEVICE_BY_NAME:
1130 devfs_find_device_by_name_worker(msg);
1132 case DEVFS_FIND_DEVICE_BY_UDEV:
1133 devfs_find_device_by_udev_worker(msg);
1135 case DEVFS_MAKE_ALIAS:
1136 devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load);
1138 case DEVFS_APPLY_RULES:
1139 devfs_apply_reset_rules_caller(msg->mdv_name, 1);
1141 case DEVFS_RESET_RULES:
1142 devfs_apply_reset_rules_caller(msg->mdv_name, 0);
1144 case DEVFS_SCAN_CALLBACK:
1145 devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load,
1148 case DEVFS_CLR_SUBNAMES_FLAG:
1149 devfs_clr_subnames_flag_worker(msg->mdv_flags.name,
1150 msg->mdv_flags.flag);
1152 case DEVFS_DESTROY_SUBNAMES_WO_FLAG:
1153 devfs_destroy_subnames_without_flag_worker(msg->mdv_flags.name,
1154 msg->mdv_flags.flag);
1156 case DEVFS_INODE_TO_VNODE:
1157 msg->mdv_ino.vp = devfs_iterate_topology(
1158 DEVFS_MNTDATA(msg->mdv_ino.mp)->root_node,
1159 (devfs_iterate_callback_t *)devfs_inode_to_vnode_worker_callback,
1162 case DEVFS_TERMINATE_CORE:
1168 devfs_debug(DEVFS_DEBUG_WARNING,
1169 "devfs_msg_core: unknown message "
1170 "received at core\n");
1173 lockmgr(&devfs_lock, LK_RELEASE);
1177 * Worker function to insert a new dev into the dev list and initialize its
1178 * permissions. It also calls devfs_propagate_dev which in turn propagates
1179 * the change to all mount points.
1181 * The passed dev is already referenced. This reference is eaten by this
1182 * function and represents the dev's linkage into devfs_dev_list.
1185 devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms)
1191 dev->si_perms = perms;
1193 devfs_link_dev(dev);
1194 devfs_propagate_dev(dev, 1);
1196 udev_event_attach(dev, NULL, 0);
1202 * Worker function to delete a dev from the dev list and free the cdev.
1203 * It also calls devfs_propagate_dev which in turn propagates the change
1204 * to all mount points.
1207 devfs_destroy_dev_worker(cdev_t dev)
1212 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1214 error = devfs_unlink_dev(dev);
1215 devfs_propagate_dev(dev, 0);
1217 udev_event_detach(dev, NULL, 0);
1220 release_dev(dev); /* link ref */
1228 * Worker function to destroy all devices with a certain basename.
1229 * Calls devfs_destroy_dev_worker for the actual destruction.
1232 devfs_destroy_subnames_worker(char *name)
1235 size_t len = strlen(name);
1237 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1238 if ((!strncmp(dev->si_name, name, len)) &&
1239 (dev->si_name[len] != '\0')) {
1240 devfs_destroy_dev_worker(dev);
1247 devfs_clr_subnames_flag_worker(char *name, uint32_t flag)
1250 size_t len = strlen(name);
1252 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1253 if ((!strncmp(dev->si_name, name, len)) &&
1254 (dev->si_name[len] != '\0')) {
1255 dev->si_flags &= ~flag;
1263 devfs_destroy_subnames_without_flag_worker(char *name, uint32_t flag)
1266 size_t len = strlen(name);
1268 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1269 if ((!strncmp(dev->si_name, name, len)) &&
1270 (dev->si_name[len] != '\0')) {
1271 if (!(dev->si_flags & flag)) {
1272 devfs_destroy_dev_worker(dev);
1281 * Worker function that creates all device nodes on top of a devfs
1285 devfs_create_all_dev_worker(struct devfs_node *root)
1291 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1292 devfs_create_device_node(root, dev, NULL, NULL);
1299 * Worker function that destroys all devices that match a specific
1300 * dev_ops and/or minor. If minor is less than 0, it is not matched
1301 * against. It also propagates all changes.
1304 devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor)
1310 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1311 if (dev->si_ops != ops)
1313 if ((minor < 0) || (dev->si_uminor == minor)) {
1314 devfs_destroy_dev_worker(dev);
1322 * Worker function that registers a new clone handler in devfs.
1325 devfs_chandler_add_worker(const char *name, d_clone_t *nhandler)
1327 struct devfs_clone_handler *chandler = NULL;
1328 u_char len = strlen(name);
1333 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1334 if (chandler->namlen != len)
1337 if (!memcmp(chandler->name, name, len)) {
1338 /* Clonable basename already exists */
1343 chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO);
1344 chandler->name = kstrdup(name, M_DEVFS);
1345 chandler->namlen = len;
1346 chandler->nhandler = nhandler;
1348 TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link);
1353 * Worker function that removes a given clone handler from the
1354 * clone handler list.
1357 devfs_chandler_del_worker(const char *name)
1359 struct devfs_clone_handler *chandler, *chandler2;
1360 u_char len = strlen(name);
1365 TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) {
1366 if (chandler->namlen != len)
1368 if (memcmp(chandler->name, name, len))
1371 TAILQ_REMOVE(&devfs_chandler_list, chandler, link);
1372 kfree(chandler->name, M_DEVFS);
1373 kfree(chandler, M_DEVFS);
1381 * Worker function that finds a given device name and changes
1382 * the message received accordingly so that when replied to,
1383 * the answer is returned to the caller.
1386 devfs_find_device_by_name_worker(devfs_msg_t devfs_msg)
1388 struct devfs_alias *alias;
1390 cdev_t found = NULL;
1392 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1393 if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) {
1398 if (found == NULL) {
1399 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1400 if (strcmp(devfs_msg->mdv_name, alias->name) == 0) {
1401 found = alias->dev_target;
1406 devfs_msg->mdv_cdev = found;
1412 * Worker function that finds a given device udev and changes
1413 * the message received accordingly so that when replied to,
1414 * the answer is returned to the caller.
1417 devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg)
1420 cdev_t found = NULL;
1422 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1423 if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) {
1428 devfs_msg->mdv_cdev = found;
1434 * Worker function that inserts a given alias into the
1435 * alias list, and propagates the alias to all mount
1439 devfs_make_alias_worker(struct devfs_alias *alias)
1441 struct devfs_alias *alias2;
1442 size_t len = strlen(alias->name);
1445 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1446 if (len != alias2->namlen)
1449 if (!memcmp(alias->name, alias2->name, len)) {
1457 * The alias doesn't exist yet, so we add it to the alias list
1459 TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link);
1460 devfs_alias_propagate(alias);
1461 udev_event_attach(alias->dev_target, alias->name, 1);
1463 devfs_debug(DEVFS_DEBUG_WARNING,
1464 "Warning: duplicate devfs_make_alias for %s\n",
1466 kfree(alias->name, M_DEVFS);
1467 kfree(alias, M_DEVFS);
1474 * Function that removes and frees all aliases.
1477 devfs_alias_reap(void)
1479 struct devfs_alias *alias, *alias2;
1481 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1482 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1483 kfree(alias, M_DEVFS);
1489 * Function that removes an alias matching a specific cdev and frees
1493 devfs_alias_remove(cdev_t dev)
1495 struct devfs_alias *alias, *alias2;
1497 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1498 if (alias->dev_target == dev) {
1499 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1500 udev_event_detach(alias->dev_target, alias->name, 1);
1501 kfree(alias, M_DEVFS);
1508 * This function propagates a new alias to all mount points.
1511 devfs_alias_propagate(struct devfs_alias *alias)
1513 struct devfs_mnt_data *mnt;
1515 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1516 devfs_alias_apply(mnt->root_node, alias);
1522 * This function is a recursive function iterating through
1523 * all device nodes in the topology and, if applicable,
1524 * creating the relevant alias for a device node.
1527 devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias)
1529 struct devfs_node *node1, *node2;
1531 KKASSERT(alias != NULL);
1533 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
1534 if (node->nchildren > 2) {
1535 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
1536 devfs_alias_apply(node1, alias);
1540 if (node->d_dev == alias->dev_target)
1541 devfs_alias_create(alias->name, node, 0);
1547 * This function checks if any alias possibly is applicable
1548 * to the given node. If so, the alias is created.
1551 devfs_alias_check_create(struct devfs_node *node)
1553 struct devfs_alias *alias;
1555 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1556 if (node->d_dev == alias->dev_target)
1557 devfs_alias_create(alias->name, node, 0);
1563 * This function creates an alias with a given name
1564 * linking to a given devfs node. It also increments
1565 * the link count on the target node.
1568 devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based)
1570 struct mount *mp = target->mp;
1571 struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node;
1572 struct devfs_node *linknode;
1573 struct hotplug_device *hpdev;
1574 char *create_path = NULL;
1579 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1581 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1582 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name);
1585 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1588 if (devfs_find_device_node_by_name(parent, name)) {
1589 devfs_debug(DEVFS_DEBUG_WARNING,
1590 "Node already exists: %s "
1591 "(devfs_make_alias_worker)!\n",
1597 linknode = devfs_allocp(Plink, name, parent, mp, NULL);
1598 if (linknode == NULL) {
1603 linknode->link_target = target;
1607 linknode->flags |= DEVFS_RULE_CREATED;
1610 /* hotplug handler */
1611 if(devfs_node_added) {
1612 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK);
1613 hpdev->dev = target->d_dev;
1614 hpdev->name = name_orig;
1615 devfs_node_added(hpdev);
1616 kfree(hpdev, M_TEMP);
1618 kfree(name_buf, M_TEMP);
1623 * This function is called by the core and handles mount point
1624 * strings. It either calls the relevant worker (devfs_apply_
1625 * reset_rules_worker) on all mountpoints or only a specific
1629 devfs_apply_reset_rules_caller(char *mountto, int apply)
1631 struct devfs_mnt_data *mnt;
1633 if (mountto[0] == '*') {
1634 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1635 devfs_iterate_topology(mnt->root_node,
1636 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1640 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1641 if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) {
1642 devfs_iterate_topology(mnt->root_node,
1643 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1650 kfree(mountto, M_DEVFS);
1655 * This function calls a given callback function for
1656 * every dev node in the devfs dev list.
1659 devfs_scan_callback_worker(devfs_scan_t *callback, void *arg)
1663 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1671 * This function tries to resolve a given directory, or if not
1672 * found and creation requested, creates the given directory.
1674 static struct devfs_node *
1675 devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name,
1676 size_t name_len, int create)
1678 struct devfs_node *node, *found = NULL;
1680 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1681 if (name_len != node->d_dir.d_namlen)
1684 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) {
1690 if ((found == NULL) && (create)) {
1691 found = devfs_allocp(Pdir, dir_name, parent, parent->mp, NULL);
1698 * This function tries to resolve a complete path. If creation is requested,
1699 * if a given part of the path cannot be resolved (because it doesn't exist),
1703 devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create)
1705 struct devfs_node *node = parent;
1712 buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1714 while (*path && idx < PATH_MAX - 1) {
1719 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1729 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1730 kfree (buf, M_TEMP);
1735 * Takes a full path and strips it into a directory path and a name.
1736 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It
1737 * requires a working buffer with enough size to keep the whole
1741 devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep)
1745 size_t len = strlen(fullpath) + 1;
1748 KKASSERT((fullpath != NULL) && (buf != NULL));
1749 KKASSERT((pathp != NULL) && (namep != NULL));
1751 memcpy(buf, fullpath, len);
1753 for (i = len-1; i>= 0; i--) {
1754 if (buf[i] == '/') {
1774 * This function creates a new devfs node for a given device. It can
1775 * handle a complete path as device name, and accordingly creates
1776 * the path and the final device node.
1778 * The reference count on the passed dev remains unchanged.
1781 devfs_create_device_node(struct devfs_node *root, cdev_t dev,
1782 char *dev_name, char *path_fmt, ...)
1784 struct devfs_node *parent, *node = NULL;
1785 struct hotplug_device *hpdev;
1791 char *create_path = NULL;
1792 char *names = "pqrsPQRS";
1794 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1796 if (path_fmt != NULL) {
1797 __va_start(ap, path_fmt);
1798 kvasnrprintf(&path, PATH_MAX, 10, path_fmt, ap);
1802 parent = devfs_resolve_or_create_path(root, path, 1);
1805 devfs_resolve_name_path(
1806 ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name),
1807 name_buf, &create_path, &name);
1810 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1813 if (devfs_find_device_node_by_name(parent, name)) {
1814 devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: "
1815 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name);
1819 node = devfs_allocp(Pdev, name, parent, parent->mp, dev);
1820 nanotime(&parent->mtime);
1823 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their
1826 if ((dev) && (strlen(dev->si_name) >= 4) &&
1827 (!memcmp(dev->si_name, "ptm/", 4))) {
1828 node->parent->flags |= DEVFS_HIDDEN;
1829 node->flags |= DEVFS_HIDDEN;
1833 * Ugly pty magic, to tag pty devices as such and hide them if needed.
1835 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3)))
1836 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1838 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) {
1840 for (i = 0; i < strlen(names); i++) {
1841 if (name[3] == names[i]) {
1847 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1849 /* hotplug handler */
1850 if(devfs_node_added) {
1851 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK);
1852 hpdev->dev = node->d_dev;
1853 hpdev->name = node->d_dev->si_name;
1854 devfs_node_added(hpdev);
1855 kfree(hpdev, M_TEMP);
1859 kfree(name_buf, M_TEMP);
1865 * This function finds a given device node in the topology with a given
1869 devfs_find_device_node_callback(struct devfs_node *node, cdev_t target)
1871 if ((node->node_type == Pdev) && (node->d_dev == target)) {
1879 * This function finds a device node in the given parent directory by its
1880 * name and returns it.
1883 devfs_find_device_node_by_name(struct devfs_node *parent, char *target)
1885 struct devfs_node *node, *found = NULL;
1886 size_t len = strlen(target);
1888 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1889 if (len != node->d_dir.d_namlen)
1892 if (!memcmp(node->d_dir.d_name, target, len)) {
1902 devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop)
1904 struct vnode *vp = NULL;
1905 ino_t target = *inop;
1907 if (node->d_dir.d_ino == target) {
1910 vget(vp, LK_EXCLUSIVE | LK_RETRY);
1913 devfs_allocv(&vp, node);
1922 * This function takes a cdev and removes its devfs node in the
1923 * given topology. The cdev remains intact.
1926 devfs_destroy_device_node(struct devfs_node *root, cdev_t target)
1928 struct devfs_node *node, *parent;
1931 char *create_path = NULL;
1935 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1936 ksnprintf(name_buf, PATH_MAX, "%s", target->si_name);
1938 devfs_resolve_name_path(target->si_name, name_buf, &create_path, &name);
1941 parent = devfs_resolve_or_create_path(root, create_path, 0);
1945 if (parent == NULL) {
1946 kfree(name_buf, M_TEMP);
1950 node = devfs_find_device_node_by_name(parent, name);
1953 nanotime(&node->parent->mtime);
1957 kfree(name_buf, M_TEMP);
1963 * Just set perms and ownership for given node.
1966 devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid,
1967 u_short mode, u_long flags)
1977 * Propagates a device attach/detach to all mount
1978 * points. Also takes care of automatic alias removal
1979 * for a deleted cdev.
1982 devfs_propagate_dev(cdev_t dev, int attach)
1984 struct devfs_mnt_data *mnt;
1986 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1988 /* Device is being attached */
1989 devfs_create_device_node(mnt->root_node, dev,
1992 /* Device is being detached */
1993 devfs_alias_remove(dev);
1994 devfs_destroy_device_node(mnt->root_node, dev);
2001 * devfs_clone either returns a basename from a complete name by
2002 * returning the length of the name without trailing digits, or,
2003 * if clone != 0, calls the device's clone handler to get a new
2004 * device, which in turn is returned in devp.
2007 devfs_clone(cdev_t dev, const char *name, size_t len, int mode,
2011 struct devfs_clone_handler *chandler;
2012 struct dev_clone_args ap;
2014 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
2015 if (chandler->namlen != len)
2017 if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) {
2018 lockmgr(&devfs_lock, LK_RELEASE);
2020 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2022 ap.a_head.a_dev = dev;
2028 error = (chandler->nhandler)(&ap);
2041 * Registers a new orphan in the orphan list.
2044 devfs_tracer_add_orphan(struct devfs_node *node)
2046 struct devfs_orphan *orphan;
2049 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK);
2050 orphan->node = node;
2052 KKASSERT((node->flags & DEVFS_ORPHANED) == 0);
2053 node->flags |= DEVFS_ORPHANED;
2054 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link);
2058 * Removes an orphan from the orphan list.
2061 devfs_tracer_del_orphan(struct devfs_node *node)
2063 struct devfs_orphan *orphan;
2067 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) {
2068 if (orphan->node == node) {
2069 node->flags &= ~DEVFS_ORPHANED;
2070 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link);
2071 kfree(orphan, M_DEVFS);
2078 * Counts the orphans in the orphan list, and if cleanup
2079 * is specified, also frees the orphan and removes it from
2083 devfs_tracer_orphan_count(struct mount *mp, int cleanup)
2085 struct devfs_orphan *orphan, *orphan2;
2088 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) {
2091 * If we are instructed to clean up, we do so.
2094 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link);
2095 orphan->node->flags &= ~DEVFS_ORPHANED;
2096 devfs_freep(orphan->node);
2097 kfree(orphan, M_DEVFS);
2105 * Fetch an ino_t from the global d_ino by increasing it
2109 devfs_fetch_ino(void)
2113 spin_lock_wr(&ino_lock);
2115 spin_unlock_wr(&ino_lock);
2121 * Allocates a new cdev and initializes it's most basic
2125 devfs_new_cdev(struct dev_ops *ops, int minor, struct dev_ops *bops)
2127 cdev_t dev = sysref_alloc(&cdev_sysref_class);
2129 sysref_activate(&dev->si_sysref);
2131 bzero(dev, offsetof(struct cdev, si_sysref));
2136 dev->si_drv1 = NULL;
2137 dev->si_drv2 = NULL;
2138 dev->si_lastread = 0; /* time_second */
2139 dev->si_lastwrite = 0; /* time_second */
2144 dev->si_uminor = minor;
2145 dev->si_bops = bops;
2146 /* If there is a backing device, we reference its ops */
2147 dev->si_inode = makeudev(
2148 devfs_reference_ops((bops)?(bops):(ops)),
2155 devfs_cdev_terminate(cdev_t dev)
2159 /* Check if it is locked already. if not, we acquire the devfs lock */
2160 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
2161 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2165 /* Propagate destruction, just in case */
2166 devfs_propagate_dev(dev, 0);
2168 /* If we acquired the lock, we also get rid of it */
2170 lockmgr(&devfs_lock, LK_RELEASE);
2172 /* If there is a backing device, we release the backing device's ops */
2173 devfs_release_ops((dev->si_bops)?(dev->si_bops):(dev->si_ops));
2175 /* Finally destroy the device */
2176 sysref_put(&dev->si_sysref);
2180 * Dummies for now (individual locks for MPSAFE)
2183 devfs_cdev_lock(cdev_t dev)
2188 devfs_cdev_unlock(cdev_t dev)
2193 * Links a given cdev into the dev list.
2196 devfs_link_dev(cdev_t dev)
2198 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
2199 dev->si_flags |= SI_DEVFS_LINKED;
2200 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link);
2206 * Removes a given cdev from the dev list. The caller is responsible for
2207 * releasing the reference on the device associated with the linkage.
2209 * Returns EALREADY if the dev has already been unlinked.
2212 devfs_unlink_dev(cdev_t dev)
2214 if ((dev->si_flags & SI_DEVFS_LINKED)) {
2215 TAILQ_REMOVE(&devfs_dev_list, dev, link);
2216 dev->si_flags &= ~SI_DEVFS_LINKED;
2223 devfs_node_is_accessible(struct devfs_node *node)
2225 if ((node) && (!(node->flags & DEVFS_HIDDEN)))
2232 devfs_reference_ops(struct dev_ops *ops)
2235 struct devfs_dev_ops *found = NULL;
2236 struct devfs_dev_ops *devops;
2238 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2239 if (devops->ops == ops) {
2246 found = kmalloc(sizeof(struct devfs_dev_ops), M_DEVFS, M_WAITOK);
2248 found->ref_count = 0;
2249 TAILQ_INSERT_TAIL(&devfs_dev_ops_list, found, link);
2254 if (found->ref_count == 0) {
2255 found->id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255);
2256 if (found->id == -1) {
2257 /* Ran out of unique ids */
2258 devfs_debug(DEVFS_DEBUG_WARNING,
2259 "devfs_reference_ops: WARNING: ran out of unique ids\n");
2269 devfs_release_ops(struct dev_ops *ops)
2271 struct devfs_dev_ops *found = NULL;
2272 struct devfs_dev_ops *devops;
2274 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2275 if (devops->ops == ops) {
2285 if (found->ref_count == 0) {
2286 TAILQ_REMOVE(&devfs_dev_ops_list, found, link);
2287 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), found->id);
2288 kfree(found, M_DEVFS);
2297 msg = devfs_msg_get();
2298 msg = devfs_msg_send_sync(DEVFS_SYNC, msg);
2303 * Called on init of devfs; creates the objcaches and
2304 * spawns off the devfs core thread. Also initializes
2310 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n");
2311 /* Create objcaches for nodes, msgs and devs */
2312 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0,
2314 objcache_malloc_alloc,
2315 objcache_malloc_free,
2316 &devfs_node_malloc_args );
2318 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0,
2320 objcache_malloc_alloc,
2321 objcache_malloc_free,
2322 &devfs_msg_malloc_args );
2324 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0,
2326 objcache_malloc_alloc,
2327 objcache_malloc_free,
2328 &devfs_dev_malloc_args );
2330 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id));
2332 /* Initialize the reply-only port which acts as a message drain */
2333 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply);
2335 /* Initialize *THE* devfs lock */
2336 lockinit(&devfs_lock, "devfs_core lock", 0, 0);
2339 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL,
2340 0, 0, "devfs_msg_core");
2342 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2344 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n");
2348 * Called on unload of devfs; takes care of destroying the core
2349 * and the objcaches. Also removes aliases that are no longer needed.
2354 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
2356 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL);
2358 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2359 tsleep(td_core/*devfs_id*/, 0, "devfsc", 10000);
2361 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id));
2363 /* Destroy the objcaches */
2364 objcache_destroy(devfs_msg_cache);
2365 objcache_destroy(devfs_node_cache);
2366 objcache_destroy(devfs_dev_cache);
2372 * This is a sysctl handler to assist userland devname(3) to
2373 * find the device name for a given udev.
2376 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS)
2383 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t))))
2386 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev);
2391 if ((found = devfs_find_device_by_udev(udev)) == NULL)
2394 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1));
2398 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
2399 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)");
2401 SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
2402 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable);
2403 SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable,
2404 0, "Enable DevFS debugging");
2406 SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST,
2408 SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY,
2409 devfs_uninit, NULL);