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 <vfs/devfs/devfs.h>
50 #include <vfs/devfs/devfs_rules.h>
52 MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations");
53 DEVFS_DECLARE_CLONE_BITMAP(ops_id);
55 * SYSREF Integration - reference counting, allocation,
56 * sysid and syslink integration.
58 static void devfs_cdev_terminate(cdev_t dev);
59 static struct sysref_class cdev_sysref_class = {
62 .proto = SYSREF_PROTO_DEV,
63 .offset = offsetof(struct cdev, si_sysref),
64 .objsize = sizeof(struct cdev),
68 .terminate = (sysref_terminate_func_t)devfs_cdev_terminate
72 static struct objcache *devfs_node_cache;
73 static struct objcache *devfs_msg_cache;
74 static struct objcache *devfs_dev_cache;
76 static struct objcache_malloc_args devfs_node_malloc_args = {
77 sizeof(struct devfs_node), M_DEVFS };
78 struct objcache_malloc_args devfs_msg_malloc_args = {
79 sizeof(struct devfs_msg), M_DEVFS };
80 struct objcache_malloc_args devfs_dev_malloc_args = {
81 sizeof(struct cdev), M_DEVFS };
83 static struct devfs_dev_head devfs_dev_list =
84 TAILQ_HEAD_INITIALIZER(devfs_dev_list);
85 static struct devfs_mnt_head devfs_mnt_list =
86 TAILQ_HEAD_INITIALIZER(devfs_mnt_list);
87 static struct devfs_chandler_head devfs_chandler_list =
88 TAILQ_HEAD_INITIALIZER(devfs_chandler_list);
89 static struct devfs_alias_head devfs_alias_list =
90 TAILQ_HEAD_INITIALIZER(devfs_alias_list);
92 struct lock devfs_lock;
93 static struct lwkt_port devfs_dispose_port;
94 static struct lwkt_port devfs_msg_port;
95 static struct thread *td_core;
97 static struct spinlock ino_lock;
99 static int devfs_debug_enable;
100 static int devfs_run;
102 static ino_t devfs_fetch_ino(void);
103 static int devfs_create_all_dev_worker(struct devfs_node *);
104 static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int);
105 static int devfs_destroy_dev_worker(cdev_t);
106 static int devfs_destroy_subnames_worker(char *);
107 static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int);
108 static int devfs_propagate_dev(cdev_t, int);
109 static int devfs_unlink_dev(cdev_t dev);
110 static void devfs_msg_exec(devfs_msg_t msg);
112 static int devfs_chandler_add_worker(const char *, d_clone_t *);
113 static int devfs_chandler_del_worker(const char *);
115 static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
116 static void devfs_msg_core(void *);
118 static int devfs_find_device_by_name_worker(devfs_msg_t);
119 static int devfs_find_device_by_udev_worker(devfs_msg_t);
121 static int devfs_apply_reset_rules_caller(char *, int);
123 static int devfs_scan_callback_worker(devfs_scan_t *);
125 static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *,
126 char *, size_t, int);
128 static int devfs_make_alias_worker(struct devfs_alias *);
129 static int devfs_alias_remove(cdev_t);
130 static int devfs_alias_reap(void);
131 static int devfs_alias_propagate(struct devfs_alias *);
132 static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *);
133 static int devfs_alias_check_create(struct devfs_node *);
135 static int devfs_clr_subnames_flag_worker(char *, uint32_t);
136 static int devfs_destroy_subnames_without_flag_worker(char *, uint32_t);
138 static void *devfs_reaperp_callback(struct devfs_node *, void *);
139 static void *devfs_gc_dirs_callback(struct devfs_node *, void *);
140 static void *devfs_gc_links_callback(struct devfs_node *, struct devfs_node *);
142 devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *);
145 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function
149 devfs_debug(int level, char *fmt, ...)
154 if (level <= devfs_debug_enable)
162 * devfs_allocp() Allocates a new devfs node with the specified
163 * parameters. The node is also automatically linked into the topology
164 * if a parent is specified. It also calls the rule and alias stuff to
165 * be applied on the new node
168 devfs_allocp(devfs_nodetype devfsnodetype, char *name,
169 struct devfs_node *parent, struct mount *mp, cdev_t dev)
171 struct devfs_node *node = NULL;
172 size_t namlen = strlen(name);
174 node = objcache_get(devfs_node_cache, M_WAITOK);
175 bzero(node, sizeof(*node));
177 atomic_add_long(&(DEVFS_MNTDATA(mp)->leak_count), 1);
182 node->d_dir.d_ino = devfs_fetch_ino();
185 * Cookie jar for children. Leave 0 and 1 for '.' and '..' entries
188 node->cookie_jar = 2;
191 * Access Control members
193 node->mode = DEVFS_DEFAULT_MODE;
194 node->uid = DEVFS_DEFAULT_UID;
195 node->gid = DEVFS_DEFAULT_GID;
197 switch (devfsnodetype) {
200 * Ensure that we don't recycle the root vnode by marking it as
201 * linked into the topology.
203 node->flags |= DEVFS_NODE_LINKED;
205 TAILQ_INIT(DEVFS_DENODE_HEAD(node));
206 node->d_dir.d_type = DT_DIR;
211 node->d_dir.d_type = DT_LNK;
215 node->d_dir.d_type = DT_REG;
220 node->d_dir.d_type = DT_CHR;
223 node->mode = dev->si_perms;
224 node->uid = dev->si_uid;
225 node->gid = dev->si_gid;
227 devfs_alias_check_create(node);
232 panic("devfs_allocp: unknown node type");
236 node->node_type = devfsnodetype;
238 /* Initialize the dirent structure of each devfs vnode */
239 KKASSERT(namlen < 256);
240 node->d_dir.d_namlen = namlen;
241 node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK);
242 memcpy(node->d_dir.d_name, name, namlen);
243 node->d_dir.d_name[namlen] = '\0';
245 /* Initialize the parent node element */
246 node->parent = parent;
249 devfs_rule_check_apply(node, NULL);
251 /* Initialize *time members */
252 nanotime(&node->atime);
253 node->mtime = node->ctime = node->atime;
256 * Associate with parent as last step, clean out namecache
259 if ((parent != NULL) &&
260 ((parent->node_type == Proot) || (parent->node_type == Pdir))) {
262 node->cookie = parent->cookie_jar++;
263 node->flags |= DEVFS_NODE_LINKED;
264 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link);
266 /* This forces negative namecache lookups to clear */
267 ++mp->mnt_namecache_gen;
274 * devfs_allocv() allocates a new vnode based on a devfs node.
277 devfs_allocv(struct vnode **vpp, struct devfs_node *node)
285 while ((vp = node->v_node) != NULL) {
286 error = vget(vp, LK_EXCLUSIVE);
287 if (error != ENOENT) {
293 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0)
298 if (node->v_node != NULL) {
307 switch (node->node_type) {
324 KKASSERT(node->d_dev);
326 vp->v_uminor = node->d_dev->si_uminor;
329 v_associate_rdev(vp, node->d_dev);
330 vp->v_ops = &node->mp->mnt_vn_spec_ops;
334 panic("devfs_allocv: unknown node type");
342 * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode
343 * based on the newly created devfs node.
346 devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype,
347 char *name, struct devfs_node *parent, cdev_t dev)
349 struct devfs_node *node;
351 node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
354 devfs_allocv(vpp, node);
362 * Destroy the devfs_node. The node must be unlinked from the topology.
364 * This function will also destroy any vnode association with the node
367 * The cdev_t itself remains intact.
370 devfs_freep(struct devfs_node *node)
375 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) ||
376 (node->node_type == Proot));
377 KKASSERT((node->flags & DEVFS_DESTROYED) == 0);
379 atomic_subtract_long(&(DEVFS_MNTDATA(node->mp)->leak_count), 1);
380 if (node->symlink_name) {
381 kfree(node->symlink_name, M_DEVFS);
382 node->symlink_name = NULL;
386 * Remove the node from the orphan list if it is still on it.
388 if (node->flags & DEVFS_ORPHANED)
389 devfs_tracer_del_orphan(node);
392 * Disassociate the vnode from the node. This also prevents the
393 * vnode's reclaim code from double-freeing the node.
395 * The vget is needed to safely modify the vp. It also serves
396 * to cycle the refs and terminate the vnode if it happens to
397 * be inactive, otherwise namecache references may not get cleared.
399 while ((vp = node->v_node) != NULL) {
400 if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0)
405 cache_inval_vp(vp, CINV_DESTROY);
408 if (node->d_dir.d_name) {
409 kfree(node->d_dir.d_name, M_DEVFS);
410 node->d_dir.d_name = NULL;
412 node->flags |= DEVFS_DESTROYED;
414 objcache_put(devfs_node_cache, node);
420 * Unlink the devfs node from the topology and add it to the orphan list.
421 * The node will later be destroyed by freep.
423 * Any vnode association, including the v_rdev and v_data, remains intact
427 devfs_unlinkp(struct devfs_node *node)
429 struct devfs_node *parent;
433 * Add the node to the orphan list, so it is referenced somewhere, to
434 * so we don't leak it.
436 devfs_tracer_add_orphan(node);
438 parent = node->parent;
441 * If the parent is known we can unlink the node out of the topology
444 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
446 KKASSERT((parent->nchildren >= 0));
447 node->flags &= ~DEVFS_NODE_LINKED;
454 devfs_iterate_topology(struct devfs_node *node,
455 devfs_iterate_callback_t *callback, void *arg1)
457 struct devfs_node *node1, *node2;
460 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
461 if (node->nchildren > 2) {
462 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node),
464 if ((ret = devfs_iterate_topology(node1, callback, arg1)))
470 ret = callback(node, arg1);
475 * devfs_reaperp() is a recursive function that iterates through all the
476 * topology, unlinking and freeing all devfs nodes.
479 devfs_reaperp_callback(struct devfs_node *node, void *unused)
488 devfs_gc_dirs_callback(struct devfs_node *node, void *unused)
490 if (node->node_type == Pdir) {
491 if (node->nchildren == 2) {
501 devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target)
503 if ((node->node_type == Plink) && (node->link_target == target)) {
512 * devfs_gc() is devfs garbage collector. It takes care of unlinking and
513 * freeing a node, but also removes empty directories and links that link
514 * via devfs auto-link mechanism to the node being deleted.
517 devfs_gc(struct devfs_node *node)
519 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
521 if (node->nlinks > 0)
522 devfs_iterate_topology(root_node,
523 (devfs_iterate_callback_t *)devfs_gc_links_callback, node);
526 devfs_iterate_topology(root_node,
527 (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL);
535 * devfs_create_dev() is the asynchronous entry point for device creation.
536 * It just sends a message with the relevant details to the devfs core.
538 * This function will reference the passed device. The reference is owned
539 * by devfs and represents all of the device's node associations.
542 devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
545 devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
551 * devfs_destroy_dev() is the asynchronous entry point for device destruction.
552 * It just sends a message with the relevant details to the devfs core.
555 devfs_destroy_dev(cdev_t dev)
557 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
562 * devfs_mount_add() is the synchronous entry point for adding a new devfs
563 * mount. It sends a synchronous message with the relevant details to the
567 devfs_mount_add(struct devfs_mnt_data *mnt)
571 msg = devfs_msg_get();
573 msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg);
580 * devfs_mount_del() is the synchronous entry point for removing a devfs mount.
581 * It sends a synchronous message with the relevant details to the devfs core.
584 devfs_mount_del(struct devfs_mnt_data *mnt)
588 msg = devfs_msg_get();
590 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
597 * devfs_destroy_subnames() is the synchronous entry point for device
598 * destruction by subname. It just sends a message with the relevant details to
602 devfs_destroy_subnames(char *name)
606 msg = devfs_msg_get();
607 msg->mdv_load = name;
608 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES, msg);
614 devfs_clr_subnames_flag(char *name, uint32_t flag)
618 msg = devfs_msg_get();
619 msg->mdv_flags.name = name;
620 msg->mdv_flags.flag = flag;
621 msg = devfs_msg_send_sync(DEVFS_CLR_SUBNAMES_FLAG, msg);
628 devfs_destroy_subnames_without_flag(char *name, uint32_t flag)
632 msg = devfs_msg_get();
633 msg->mdv_flags.name = name;
634 msg->mdv_flags.flag = flag;
635 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES_WO_FLAG, msg);
642 * devfs_create_all_dev is the asynchronous entry point to trigger device
643 * node creation. It just sends a message with the relevant details to
647 devfs_create_all_dev(struct devfs_node *root)
649 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
654 * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all
655 * devices with a specific set of dev_ops and minor. It just sends a
656 * message with the relevant details to the devfs core.
659 devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor)
661 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor);
666 * devfs_clone_handler_add is the synchronous entry point to add a new
667 * clone handler. It just sends a message with the relevant details to
671 devfs_clone_handler_add(const char *name, d_clone_t *nhandler)
675 msg = devfs_msg_get();
676 msg->mdv_chandler.name = name;
677 msg->mdv_chandler.nhandler = nhandler;
678 msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg);
684 * devfs_clone_handler_del is the synchronous entry point to remove a
685 * clone handler. It just sends a message with the relevant details to
689 devfs_clone_handler_del(const char *name)
693 msg = devfs_msg_get();
694 msg->mdv_chandler.name = name;
695 msg->mdv_chandler.nhandler = NULL;
696 msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg);
702 * devfs_find_device_by_name is the synchronous entry point to find a
703 * device given its name. It sends a synchronous message with the
704 * relevant details to the devfs core and returns the answer.
707 devfs_find_device_by_name(const char *fmt, ...)
711 char target[PATH_MAX+1];
719 i = kvcprintf(fmt, NULL, target, 10, ap);
723 msg = devfs_msg_get();
724 msg->mdv_name = target;
725 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
726 found = msg->mdv_cdev;
733 * devfs_find_device_by_udev is the synchronous entry point to find a
734 * device given its udev number. It sends a synchronous message with
735 * the relevant details to the devfs core and returns the answer.
738 devfs_find_device_by_udev(udev_t udev)
743 msg = devfs_msg_get();
744 msg->mdv_udev = udev;
745 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
746 found = msg->mdv_cdev;
749 devfs_debug(DEVFS_DEBUG_DEBUG,
750 "devfs_find_device_by_udev found? %s -end:3-\n",
751 ((found) ? found->si_name:"NO"));
756 devfs_inode_to_vnode(struct mount *mp, ino_t target)
758 struct vnode *vp = NULL;
764 msg = devfs_msg_get();
765 msg->mdv_ino.mp = mp;
766 msg->mdv_ino.ino = target;
767 msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg);
768 vp = msg->mdv_ino.vp;
769 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
776 * devfs_make_alias is the asynchronous entry point to register an alias
777 * for a device. It just sends a message with the relevant details to the
781 devfs_make_alias(const char *name, cdev_t dev_target)
783 struct devfs_alias *alias;
788 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
789 alias->name = kstrdup(name, M_DEVFS);
791 alias->dev_target = dev_target;
793 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
798 * devfs_apply_rules is the asynchronous entry point to trigger application
799 * of all rules. It just sends a message with the relevant details to the
803 devfs_apply_rules(char *mntto)
807 new_name = kstrdup(mntto, M_DEVFS);
808 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
814 * devfs_reset_rules is the asynchronous entry point to trigger reset of all
815 * rules. It just sends a message with the relevant details to the devfs core.
818 devfs_reset_rules(char *mntto)
822 new_name = kstrdup(mntto, M_DEVFS);
823 devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
830 * devfs_scan_callback is the asynchronous entry point to call a callback
832 * It just sends a message with the relevant details to the devfs core.
835 devfs_scan_callback(devfs_scan_t *callback)
839 KKASSERT(sizeof(callback) == sizeof(void *));
841 msg = devfs_msg_get();
842 msg->mdv_load = callback;
843 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
851 * Acts as a message drain. Any message that is replied to here gets destroyed
852 * and the memory freed.
855 devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
857 devfs_msg_put((devfs_msg_t)msg);
861 * devfs_msg_get allocates a new devfs msg and returns it.
866 return objcache_get(devfs_msg_cache, M_WAITOK);
870 * devfs_msg_put deallocates a given devfs msg.
873 devfs_msg_put(devfs_msg_t msg)
875 objcache_put(devfs_msg_cache, msg);
880 * devfs_msg_send is the generic asynchronous message sending facility
881 * for devfs. By default the reply port is the automatic disposal port.
883 * If the current thread is the devfs_msg_port thread we execute the
884 * operation synchronously.
887 devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
889 lwkt_port_t port = &devfs_msg_port;
891 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
893 devfs_msg->hdr.u.ms_result = cmd;
895 if (port->mpu_td == curthread) {
896 devfs_msg_exec(devfs_msg);
897 lwkt_replymsg(&devfs_msg->hdr, 0);
899 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
904 * devfs_msg_send_sync is the generic synchronous message sending
905 * facility for devfs. It initializes a local reply port and waits
906 * for the core's answer. This answer is then returned.
909 devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg)
911 struct lwkt_port rep_port;
912 devfs_msg_t msg_incoming;
913 lwkt_port_t port = &devfs_msg_port;
915 lwkt_initport_thread(&rep_port, curthread);
916 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
918 devfs_msg->hdr.u.ms_result = cmd;
920 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
921 msg_incoming = lwkt_waitport(&rep_port, 0);
927 * sends a message with a generic argument.
930 devfs_msg_send_generic(uint32_t cmd, void *load)
932 devfs_msg_t devfs_msg = devfs_msg_get();
934 devfs_msg->mdv_load = load;
935 devfs_msg_send(cmd, devfs_msg);
939 * sends a message with a name argument.
942 devfs_msg_send_name(uint32_t cmd, char *name)
944 devfs_msg_t devfs_msg = devfs_msg_get();
946 devfs_msg->mdv_name = name;
947 devfs_msg_send(cmd, devfs_msg);
951 * sends a message with a mount argument.
954 devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt)
956 devfs_msg_t devfs_msg = devfs_msg_get();
958 devfs_msg->mdv_mnt = mnt;
959 devfs_msg_send(cmd, devfs_msg);
963 * sends a message with an ops argument.
966 devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor)
968 devfs_msg_t devfs_msg = devfs_msg_get();
970 devfs_msg->mdv_ops.ops = ops;
971 devfs_msg->mdv_ops.minor = minor;
972 devfs_msg_send(cmd, devfs_msg);
976 * sends a message with a clone handler argument.
979 devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler)
981 devfs_msg_t devfs_msg = devfs_msg_get();
983 devfs_msg->mdv_chandler.name = name;
984 devfs_msg->mdv_chandler.nhandler = handler;
985 devfs_msg_send(cmd, devfs_msg);
989 * sends a message with a device argument.
992 devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms)
994 devfs_msg_t devfs_msg = devfs_msg_get();
996 devfs_msg->mdv_dev.dev = dev;
997 devfs_msg->mdv_dev.uid = uid;
998 devfs_msg->mdv_dev.gid = gid;
999 devfs_msg->mdv_dev.perms = perms;
1001 devfs_msg_send(cmd, devfs_msg);
1005 * sends a message with a link argument.
1008 devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp)
1010 devfs_msg_t devfs_msg = devfs_msg_get();
1012 devfs_msg->mdv_link.name = name;
1013 devfs_msg->mdv_link.target = target;
1014 devfs_msg->mdv_link.mp = mp;
1015 devfs_msg_send(cmd, devfs_msg);
1019 * devfs_msg_core is the main devfs thread. It handles all incoming messages
1020 * and calls the relevant worker functions. By using messages it's assured
1021 * that events occur in the correct order.
1024 devfs_msg_core(void *arg)
1029 lwkt_initport_thread(&devfs_msg_port, curthread);
1033 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0);
1034 devfs_debug(DEVFS_DEBUG_DEBUG,
1035 "devfs_msg_core, new msg: %x\n",
1036 (unsigned int)msg->hdr.u.ms_result);
1037 devfs_msg_exec(msg);
1038 lwkt_replymsg(&msg->hdr, 0);
1045 devfs_msg_exec(devfs_msg_t msg)
1047 struct devfs_mnt_data *mnt;
1048 struct devfs_node *node;
1052 * Acquire the devfs lock to ensure safety of all called functions
1054 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1056 switch (msg->hdr.u.ms_result) {
1057 case DEVFS_DEVICE_CREATE:
1058 dev = msg->mdv_dev.dev;
1059 devfs_create_dev_worker(dev,
1062 msg->mdv_dev.perms);
1064 case DEVFS_DEVICE_DESTROY:
1065 dev = msg->mdv_dev.dev;
1066 devfs_destroy_dev_worker(dev);
1068 case DEVFS_DESTROY_SUBNAMES:
1069 devfs_destroy_subnames_worker(msg->mdv_load);
1071 case DEVFS_DESTROY_DEV_BY_OPS:
1072 devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops,
1073 msg->mdv_ops.minor);
1075 case DEVFS_CREATE_ALL_DEV:
1076 node = (struct devfs_node *)msg->mdv_load;
1077 devfs_create_all_dev_worker(node);
1079 case DEVFS_MOUNT_ADD:
1081 TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link);
1082 devfs_create_all_dev_worker(mnt->root_node);
1084 case DEVFS_MOUNT_DEL:
1086 TAILQ_REMOVE(&devfs_mnt_list, mnt, link);
1087 devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback,
1089 if (mnt->leak_count) {
1090 devfs_debug(DEVFS_DEBUG_SHOW,
1091 "Leaked %ld devfs_node elements!\n",
1095 case DEVFS_CHANDLER_ADD:
1096 devfs_chandler_add_worker(msg->mdv_chandler.name,
1097 msg->mdv_chandler.nhandler);
1099 case DEVFS_CHANDLER_DEL:
1100 devfs_chandler_del_worker(msg->mdv_chandler.name);
1102 case DEVFS_FIND_DEVICE_BY_NAME:
1103 devfs_find_device_by_name_worker(msg);
1105 case DEVFS_FIND_DEVICE_BY_UDEV:
1106 devfs_find_device_by_udev_worker(msg);
1108 case DEVFS_MAKE_ALIAS:
1109 devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load);
1111 case DEVFS_APPLY_RULES:
1112 devfs_apply_reset_rules_caller(msg->mdv_name, 1);
1114 case DEVFS_RESET_RULES:
1115 devfs_apply_reset_rules_caller(msg->mdv_name, 0);
1117 case DEVFS_SCAN_CALLBACK:
1118 devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load);
1120 case DEVFS_CLR_SUBNAMES_FLAG:
1121 devfs_clr_subnames_flag_worker(msg->mdv_flags.name,
1122 msg->mdv_flags.flag);
1124 case DEVFS_DESTROY_SUBNAMES_WO_FLAG:
1125 devfs_destroy_subnames_without_flag_worker(msg->mdv_flags.name,
1126 msg->mdv_flags.flag);
1128 case DEVFS_INODE_TO_VNODE:
1129 msg->mdv_ino.vp = devfs_iterate_topology(
1130 DEVFS_MNTDATA(msg->mdv_ino.mp)->root_node,
1131 (devfs_iterate_callback_t *)devfs_inode_to_vnode_worker_callback,
1134 case DEVFS_TERMINATE_CORE:
1140 devfs_debug(DEVFS_DEBUG_WARNING,
1141 "devfs_msg_core: unknown message "
1142 "received at core\n");
1145 lockmgr(&devfs_lock, LK_RELEASE);
1149 * Worker function to insert a new dev into the dev list and initialize its
1150 * permissions. It also calls devfs_propagate_dev which in turn propagates
1151 * the change to all mount points.
1153 * The passed dev is already referenced. This reference is eaten by this
1154 * function and represents the dev's linkage into devfs_dev_list.
1157 devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms)
1163 dev->si_perms = perms;
1165 devfs_link_dev(dev);
1166 devfs_propagate_dev(dev, 1);
1172 * Worker function to delete a dev from the dev list and free the cdev.
1173 * It also calls devfs_propagate_dev which in turn propagates the change
1174 * to all mount points.
1177 devfs_destroy_dev_worker(cdev_t dev)
1182 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1184 error = devfs_unlink_dev(dev);
1185 devfs_propagate_dev(dev, 0);
1187 release_dev(dev); /* link ref */
1195 * Worker function to destroy all devices with a certain basename.
1196 * Calls devfs_destroy_dev_worker for the actual destruction.
1199 devfs_destroy_subnames_worker(char *name)
1202 size_t len = strlen(name);
1204 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1205 if ((!strncmp(dev->si_name, name, len)) &&
1206 (dev->si_name[len] != '\0')) {
1207 devfs_destroy_dev_worker(dev);
1214 devfs_clr_subnames_flag_worker(char *name, uint32_t flag)
1217 size_t len = strlen(name);
1219 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1220 if ((!strncmp(dev->si_name, name, len)) &&
1221 (dev->si_name[len] != '\0')) {
1222 dev->si_flags &= ~flag;
1230 devfs_destroy_subnames_without_flag_worker(char *name, uint32_t flag)
1233 size_t len = strlen(name);
1235 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1236 if ((!strncmp(dev->si_name, name, len)) &&
1237 (dev->si_name[len] != '\0')) {
1238 if (!(dev->si_flags & flag)) {
1239 devfs_destroy_dev_worker(dev);
1248 * Worker function that creates all device nodes on top of a devfs
1252 devfs_create_all_dev_worker(struct devfs_node *root)
1258 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1259 devfs_create_device_node(root, dev, NULL, NULL);
1266 * Worker function that destroys all devices that match a specific
1267 * dev_ops and/or minor. If minor is less than 0, it is not matched
1268 * against. It also propagates all changes.
1271 devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor)
1277 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1278 if (dev->si_ops != ops)
1280 if ((minor < 0) || (dev->si_uminor == minor)) {
1281 devfs_destroy_dev_worker(dev);
1289 * Worker function that registers a new clone handler in devfs.
1292 devfs_chandler_add_worker(const char *name, d_clone_t *nhandler)
1294 struct devfs_clone_handler *chandler = NULL;
1295 u_char len = strlen(name);
1300 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1301 if (chandler->namlen != len)
1304 if (!memcmp(chandler->name, name, len)) {
1305 /* Clonable basename already exists */
1310 chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO);
1311 chandler->name = kstrdup(name, M_DEVFS);
1312 chandler->namlen = len;
1313 chandler->nhandler = nhandler;
1315 TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link);
1320 * Worker function that removes a given clone handler from the
1321 * clone handler list.
1324 devfs_chandler_del_worker(const char *name)
1326 struct devfs_clone_handler *chandler, *chandler2;
1327 u_char len = strlen(name);
1332 TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) {
1333 if (chandler->namlen != len)
1335 if (memcmp(chandler->name, name, len))
1338 TAILQ_REMOVE(&devfs_chandler_list, chandler, link);
1339 kfree(chandler->name, M_DEVFS);
1340 kfree(chandler, M_DEVFS);
1348 * Worker function that finds a given device name and changes
1349 * the message received accordingly so that when replied to,
1350 * the answer is returned to the caller.
1353 devfs_find_device_by_name_worker(devfs_msg_t devfs_msg)
1355 struct devfs_alias *alias;
1357 cdev_t found = NULL;
1359 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1360 if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) {
1365 if (found == NULL) {
1366 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1367 if (strcmp(devfs_msg->mdv_name, alias->name) == 0) {
1368 found = alias->dev_target;
1373 devfs_msg->mdv_cdev = found;
1379 * Worker function that finds a given device udev and changes
1380 * the message received accordingly so that when replied to,
1381 * the answer is returned to the caller.
1384 devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg)
1387 cdev_t found = NULL;
1389 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1390 if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) {
1395 devfs_msg->mdv_cdev = found;
1401 * Worker function that inserts a given alias into the
1402 * alias list, and propagates the alias to all mount
1406 devfs_make_alias_worker(struct devfs_alias *alias)
1408 struct devfs_alias *alias2;
1409 size_t len = strlen(alias->name);
1412 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1413 if (len != alias2->namlen)
1416 if (!memcmp(alias->name, alias2->name, len)) {
1424 * The alias doesn't exist yet, so we add it to the alias list
1426 TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link);
1427 devfs_alias_propagate(alias);
1429 devfs_debug(DEVFS_DEBUG_WARNING,
1430 "Warning: duplicate devfs_make_alias for %s\n",
1432 kfree(alias->name, M_DEVFS);
1433 kfree(alias, M_DEVFS);
1440 * Function that removes and frees all aliases.
1443 devfs_alias_reap(void)
1445 struct devfs_alias *alias, *alias2;
1447 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1448 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1449 kfree(alias, M_DEVFS);
1455 * Function that removes an alias matching a specific cdev and frees
1459 devfs_alias_remove(cdev_t dev)
1461 struct devfs_alias *alias, *alias2;
1463 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1464 if (alias->dev_target == dev) {
1465 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1466 kfree(alias, M_DEVFS);
1473 * This function propagates a new alias to all mount points.
1476 devfs_alias_propagate(struct devfs_alias *alias)
1478 struct devfs_mnt_data *mnt;
1480 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1481 devfs_alias_apply(mnt->root_node, alias);
1487 * This function is a recursive function iterating through
1488 * all device nodes in the topology and, if applicable,
1489 * creating the relevant alias for a device node.
1492 devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias)
1494 struct devfs_node *node1, *node2;
1496 KKASSERT(alias != NULL);
1498 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
1499 if (node->nchildren > 2) {
1500 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
1501 devfs_alias_apply(node1, alias);
1505 if (node->d_dev == alias->dev_target)
1506 devfs_alias_create(alias->name, node, 0);
1512 * This function checks if any alias possibly is applicable
1513 * to the given node. If so, the alias is created.
1516 devfs_alias_check_create(struct devfs_node *node)
1518 struct devfs_alias *alias;
1520 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1521 if (node->d_dev == alias->dev_target)
1522 devfs_alias_create(alias->name, node, 0);
1528 * This function creates an alias with a given name
1529 * linking to a given devfs node. It also increments
1530 * the link count on the target node.
1533 devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based)
1535 struct mount *mp = target->mp;
1536 struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node;
1537 struct devfs_node *linknode;
1538 char *create_path = NULL;
1539 char *name, name_buf[PATH_MAX];
1541 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1543 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name);
1546 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1549 if (devfs_find_device_node_by_name(parent, name)) {
1550 devfs_debug(DEVFS_DEBUG_WARNING,
1551 "Node already exists: %s "
1552 "(devfs_make_alias_worker)!\n",
1558 linknode = devfs_allocp(Plink, name, parent, mp, NULL);
1559 if (linknode == NULL)
1562 linknode->link_target = target;
1566 linknode->flags |= DEVFS_RULE_CREATED;
1572 * This function is called by the core and handles mount point
1573 * strings. It either calls the relevant worker (devfs_apply_
1574 * reset_rules_worker) on all mountpoints or only a specific
1578 devfs_apply_reset_rules_caller(char *mountto, int apply)
1580 struct devfs_mnt_data *mnt;
1581 size_t len = strlen(mountto);
1583 if (mountto[0] == '*') {
1584 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1585 devfs_iterate_topology(mnt->root_node,
1586 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1590 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1591 if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) {
1592 devfs_iterate_topology(mnt->root_node,
1593 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1600 kfree(mountto, M_DEVFS);
1605 * This function calls a given callback function for
1606 * every dev node in the devfs dev list.
1609 devfs_scan_callback_worker(devfs_scan_t *callback)
1613 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1621 * This function tries to resolve a given directory, or if not
1622 * found and creation requested, creates the given directory.
1624 static struct devfs_node *
1625 devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name,
1626 size_t name_len, int create)
1628 struct devfs_node *node, *found = NULL;
1630 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1631 if (name_len != node->d_dir.d_namlen)
1634 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) {
1640 if ((found == NULL) && (create)) {
1641 found = devfs_allocp(Pdir, dir_name, parent, parent->mp, NULL);
1648 * This function tries to resolve a complete path. If creation is requested,
1649 * if a given part of the path cannot be resolved (because it doesn't exist),
1653 devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create)
1655 struct devfs_node *node = parent;
1664 for (; *path != '\0' ; path++) {
1669 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1676 return devfs_resolve_or_create_dir(node, buf, idx, create);
1680 * Takes a full path and strips it into a directory path and a name.
1681 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It
1682 * requires a working buffer with enough size to keep the whole
1686 devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep)
1690 size_t len = strlen(fullpath) + 1;
1693 KKASSERT((fullpath != NULL) && (buf != NULL));
1694 KKASSERT((pathp != NULL) && (namep != NULL));
1696 memcpy(buf, fullpath, len);
1698 for (i = len-1; i>= 0; i--) {
1699 if (buf[i] == '/') {
1719 * This function creates a new devfs node for a given device. It can
1720 * handle a complete path as device name, and accordingly creates
1721 * the path and the final device node.
1723 * The reference count on the passed dev remains unchanged.
1726 devfs_create_device_node(struct devfs_node *root, cdev_t dev,
1727 char *dev_name, char *path_fmt, ...)
1729 struct devfs_node *parent, *node = NULL;
1731 char *name, name_buf[PATH_MAX];
1735 char *create_path = NULL;
1736 char *names = "pqrsPQRS";
1738 if (path_fmt != NULL) {
1739 path = kmalloc(PATH_MAX+1, M_DEVFS, M_WAITOK);
1741 __va_start(ap, path_fmt);
1742 i = kvcprintf(path_fmt, NULL, path, 10, ap);
1747 parent = devfs_resolve_or_create_path(root, path, 1);
1750 devfs_resolve_name_path(
1751 ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name),
1752 name_buf, &create_path, &name);
1755 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1758 if (devfs_find_device_node_by_name(parent, name)) {
1759 devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: "
1760 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name);
1764 node = devfs_allocp(Pdev, name, parent, parent->mp, dev);
1765 nanotime(&parent->mtime);
1768 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their
1771 if ((dev) && (strlen(dev->si_name) >= 4) &&
1772 (!memcmp(dev->si_name, "ptm/", 4))) {
1773 node->parent->flags |= DEVFS_HIDDEN;
1774 node->flags |= DEVFS_HIDDEN;
1779 * Ugly pty magic, to tag pty devices as such and hide them if needed.
1781 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3)))
1782 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1784 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) {
1786 for (i = 0; i < strlen(names); i++) {
1787 if (name[3] == names[i]) {
1793 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1797 if (path_fmt != NULL)
1798 kfree(path, M_DEVFS);
1804 * This function finds a given device node in the topology with a given
1808 devfs_find_device_node_callback(struct devfs_node *node, cdev_t target)
1810 if ((node->node_type == Pdev) && (node->d_dev == target)) {
1818 * This function finds a device node in the given parent directory by its
1819 * name and returns it.
1822 devfs_find_device_node_by_name(struct devfs_node *parent, char *target)
1824 struct devfs_node *node, *found = NULL;
1825 size_t len = strlen(target);
1827 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1828 if (len != node->d_dir.d_namlen)
1831 if (!memcmp(node->d_dir.d_name, target, len)) {
1841 devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop)
1843 struct vnode *vp = NULL;
1844 ino_t target = *inop;
1846 if (node->d_dir.d_ino == target) {
1849 vget(vp, LK_EXCLUSIVE | LK_RETRY);
1852 devfs_allocv(&vp, node);
1861 * This function takes a cdev and removes its devfs node in the
1862 * given topology. The cdev remains intact.
1865 devfs_destroy_device_node(struct devfs_node *root, cdev_t target)
1867 struct devfs_node *node, *parent;
1868 char *name, name_buf[PATH_MAX];
1869 char *create_path = NULL;
1873 memcpy(name_buf, target->si_name, strlen(target->si_name)+1);
1875 devfs_resolve_name_path(target->si_name, name_buf, &create_path, &name);
1878 parent = devfs_resolve_or_create_path(root, create_path, 0);
1885 node = devfs_find_device_node_by_name(parent, name);
1888 nanotime(&node->parent->mtime);
1896 * Just set perms and ownership for given node.
1899 devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid,
1900 u_short mode, u_long flags)
1910 * Propagates a device attach/detach to all mount
1911 * points. Also takes care of automatic alias removal
1912 * for a deleted cdev.
1915 devfs_propagate_dev(cdev_t dev, int attach)
1917 struct devfs_mnt_data *mnt;
1919 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1921 /* Device is being attached */
1922 devfs_create_device_node(mnt->root_node, dev,
1925 /* Device is being detached */
1926 devfs_alias_remove(dev);
1927 devfs_destroy_device_node(mnt->root_node, dev);
1934 * devfs_node_to_path takes a node and a buffer of a size of
1935 * at least PATH_MAX, resolves the full path from the root
1936 * node and writes it in a humanly-readable format into the
1938 * If DEVFS_STASH_DEPTH is less than the directory level up
1939 * to the root node, only the last DEVFS_STASH_DEPTH levels
1940 * of the path are resolved.
1943 devfs_node_to_path(struct devfs_node *node, char *buffer)
1945 #define DEVFS_STASH_DEPTH 32
1946 struct devfs_node *node_stash[DEVFS_STASH_DEPTH];
1948 memset(buffer, 0, PATH_MAX);
1950 for (i = 0; (i < DEVFS_STASH_DEPTH) && (node->node_type != Proot); i++) {
1951 node_stash[i] = node;
1952 node = node->parent;
1956 for (offset = 0; i >= 0; i--) {
1957 memcpy(buffer+offset, node_stash[i]->d_dir.d_name,
1958 node_stash[i]->d_dir.d_namlen);
1959 offset += node_stash[i]->d_dir.d_namlen;
1961 *(buffer+offset) = '/';
1965 #undef DEVFS_STASH_DEPTH
1970 * devfs_clone either returns a basename from a complete name by
1971 * returning the length of the name without trailing digits, or,
1972 * if clone != 0, calls the device's clone handler to get a new
1973 * device, which in turn is returned in devp.
1976 devfs_clone(cdev_t dev, const char *name, size_t len, int mode,
1980 struct devfs_clone_handler *chandler;
1981 struct dev_clone_args ap;
1983 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1984 if (chandler->namlen != len)
1986 if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) {
1987 lockmgr(&devfs_lock, LK_RELEASE);
1989 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1991 ap.a_head.a_dev = dev;
1997 error = (chandler->nhandler)(&ap);
2010 * Registers a new orphan in the orphan list.
2013 devfs_tracer_add_orphan(struct devfs_node *node)
2015 struct devfs_orphan *orphan;
2018 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK);
2019 orphan->node = node;
2021 KKASSERT((node->flags & DEVFS_ORPHANED) == 0);
2022 node->flags |= DEVFS_ORPHANED;
2023 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link);
2027 * Removes an orphan from the orphan list.
2030 devfs_tracer_del_orphan(struct devfs_node *node)
2032 struct devfs_orphan *orphan;
2036 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) {
2037 if (orphan->node == node) {
2038 node->flags &= ~DEVFS_ORPHANED;
2039 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link);
2040 kfree(orphan, M_DEVFS);
2047 * Counts the orphans in the orphan list, and if cleanup
2048 * is specified, also frees the orphan and removes it from
2052 devfs_tracer_orphan_count(struct mount *mp, int cleanup)
2054 struct devfs_orphan *orphan, *orphan2;
2057 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) {
2060 * If we are instructed to clean up, we do so.
2063 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link);
2064 orphan->node->flags &= ~DEVFS_ORPHANED;
2065 devfs_freep(orphan->node);
2066 kfree(orphan, M_DEVFS);
2074 * Fetch an ino_t from the global d_ino by increasing it
2078 devfs_fetch_ino(void)
2082 spin_lock_wr(&ino_lock);
2084 spin_unlock_wr(&ino_lock);
2090 * Allocates a new cdev and initializes it's most basic
2094 devfs_new_cdev(struct dev_ops *ops, int minor)
2096 cdev_t dev = sysref_alloc(&cdev_sysref_class);
2097 sysref_activate(&dev->si_sysref);
2099 memset(dev, 0, offsetof(struct cdev, si_sysref));
2104 dev->si_drv1 = NULL;
2105 dev->si_drv2 = NULL;
2106 dev->si_lastread = 0; /* time_second */
2107 dev->si_lastwrite = 0; /* time_second */
2112 dev->si_uminor = minor;
2113 dev->si_inode = makeudev(devfs_reference_ops(ops), minor);
2119 devfs_cdev_terminate(cdev_t dev)
2123 /* Check if it is locked already. if not, we acquire the devfs lock */
2124 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
2125 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2129 /* Propagate destruction, just in case */
2130 devfs_propagate_dev(dev, 0);
2132 /* If we acquired the lock, we also get rid of it */
2134 lockmgr(&devfs_lock, LK_RELEASE);
2136 devfs_release_ops(dev->si_ops);
2138 /* Finally destroy the device */
2139 sysref_put(&dev->si_sysref);
2143 * Links a given cdev into the dev list.
2146 devfs_link_dev(cdev_t dev)
2148 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
2149 dev->si_flags |= SI_DEVFS_LINKED;
2150 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link);
2156 * Removes a given cdev from the dev list. The caller is responsible for
2157 * releasing the reference on the device associated with the linkage.
2159 * Returns EALREADY if the dev has already been unlinked.
2162 devfs_unlink_dev(cdev_t dev)
2164 if ((dev->si_flags & SI_DEVFS_LINKED)) {
2165 TAILQ_REMOVE(&devfs_dev_list, dev, link);
2166 dev->si_flags &= ~SI_DEVFS_LINKED;
2173 devfs_node_is_accessible(struct devfs_node *node)
2175 if ((node) && (!(node->flags & DEVFS_HIDDEN)))
2182 devfs_reference_ops(struct dev_ops *ops)
2186 if (ops->head.refs == 0) {
2187 ops->head.id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255);
2188 if (ops->head.id == -1) {
2189 /* Ran out of unique ids */
2190 devfs_debug(DEVFS_DEBUG_WARNING,
2191 "devfs_reference_ops: WARNING: ran out of unique ids\n");
2194 unit = ops->head.id;
2201 devfs_release_ops(struct dev_ops *ops)
2205 if (ops->head.refs == 0) {
2206 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), ops->head.id);
2215 msg = devfs_msg_get();
2216 msg = devfs_msg_send_sync(DEVFS_SYNC, msg);
2221 * Called on init of devfs; creates the objcaches and
2222 * spawns off the devfs core thread. Also initializes
2228 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n");
2229 /* Create objcaches for nodes, msgs and devs */
2230 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0,
2232 objcache_malloc_alloc,
2233 objcache_malloc_free,
2234 &devfs_node_malloc_args );
2236 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0,
2238 objcache_malloc_alloc,
2239 objcache_malloc_free,
2240 &devfs_msg_malloc_args );
2242 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0,
2244 objcache_malloc_alloc,
2245 objcache_malloc_free,
2246 &devfs_dev_malloc_args );
2248 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id));
2250 /* Initialize the reply-only port which acts as a message drain */
2251 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply);
2253 /* Initialize *THE* devfs lock */
2254 lockinit(&devfs_lock, "devfs_core lock", 0, 0);
2257 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL,
2258 0, 0, "devfs_msg_core");
2260 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2262 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n");
2266 * Called on unload of devfs; takes care of destroying the core
2267 * and the objcaches. Also removes aliases that are no longer needed.
2272 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
2274 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL);
2276 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2277 tsleep(td_core/*devfs_id*/, 0, "devfsc", 10000);
2279 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id));
2281 /* Destroy the objcaches */
2282 objcache_destroy(devfs_msg_cache);
2283 objcache_destroy(devfs_node_cache);
2284 objcache_destroy(devfs_dev_cache);
2290 * This is a sysctl handler to assist userland devname(3) to
2291 * find the device name for a given udev.
2294 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS)
2301 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t))))
2304 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev);
2309 if ((found = devfs_find_device_by_udev(udev)) == NULL)
2312 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1));
2316 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
2317 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)");
2319 static SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
2320 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable);
2321 SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable,
2322 0, "Enable DevFS debugging");
2324 SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST,
2326 SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY,
2327 devfs_uninit, NULL);