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>
53 MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations");
54 DEVFS_DECLARE_CLONE_BITMAP(ops_id);
56 * SYSREF Integration - reference counting, allocation,
57 * sysid and syslink integration.
59 static void devfs_cdev_terminate(cdev_t dev);
60 static struct sysref_class cdev_sysref_class = {
63 .proto = SYSREF_PROTO_DEV,
64 .offset = offsetof(struct cdev, si_sysref),
65 .objsize = sizeof(struct cdev),
69 .terminate = (sysref_terminate_func_t)devfs_cdev_terminate
73 static struct objcache *devfs_node_cache;
74 static struct objcache *devfs_msg_cache;
75 static struct objcache *devfs_dev_cache;
77 static struct objcache_malloc_args devfs_node_malloc_args = {
78 sizeof(struct devfs_node), M_DEVFS };
79 struct objcache_malloc_args devfs_msg_malloc_args = {
80 sizeof(struct devfs_msg), M_DEVFS };
81 struct objcache_malloc_args devfs_dev_malloc_args = {
82 sizeof(struct cdev), M_DEVFS };
84 static struct devfs_dev_head devfs_dev_list =
85 TAILQ_HEAD_INITIALIZER(devfs_dev_list);
86 static struct devfs_mnt_head devfs_mnt_list =
87 TAILQ_HEAD_INITIALIZER(devfs_mnt_list);
88 static struct devfs_chandler_head devfs_chandler_list =
89 TAILQ_HEAD_INITIALIZER(devfs_chandler_list);
90 static struct devfs_alias_head devfs_alias_list =
91 TAILQ_HEAD_INITIALIZER(devfs_alias_list);
92 static struct devfs_dev_ops_head devfs_dev_ops_list =
93 TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list);
95 struct lock devfs_lock;
96 static struct lwkt_port devfs_dispose_port;
97 static struct lwkt_port devfs_msg_port;
98 static struct thread *td_core;
100 static struct spinlock ino_lock;
102 static int devfs_debug_enable;
103 static int devfs_run;
105 static ino_t devfs_fetch_ino(void);
106 static int devfs_create_all_dev_worker(struct devfs_node *);
107 static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int);
108 static int devfs_destroy_dev_worker(cdev_t);
109 static int devfs_destroy_subnames_worker(char *);
110 static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int);
111 static int devfs_propagate_dev(cdev_t, int);
112 static int devfs_unlink_dev(cdev_t dev);
113 static void devfs_msg_exec(devfs_msg_t msg);
115 static int devfs_chandler_add_worker(const char *, d_clone_t *);
116 static int devfs_chandler_del_worker(const char *);
118 static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
119 static void devfs_msg_core(void *);
121 static int devfs_find_device_by_name_worker(devfs_msg_t);
122 static int devfs_find_device_by_udev_worker(devfs_msg_t);
124 static int devfs_apply_reset_rules_caller(char *, int);
126 static int devfs_scan_callback_worker(devfs_scan_t *);
128 static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *,
129 char *, size_t, int);
131 static int devfs_make_alias_worker(struct devfs_alias *);
132 static int devfs_alias_remove(cdev_t);
133 static int devfs_alias_reap(void);
134 static int devfs_alias_propagate(struct devfs_alias *);
135 static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *);
136 static int devfs_alias_check_create(struct devfs_node *);
138 static int devfs_clr_subnames_flag_worker(char *, uint32_t);
139 static int devfs_destroy_subnames_without_flag_worker(char *, uint32_t);
141 static void *devfs_reaperp_callback(struct devfs_node *, void *);
142 static void *devfs_gc_dirs_callback(struct devfs_node *, void *);
143 static void *devfs_gc_links_callback(struct devfs_node *, struct devfs_node *);
145 devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *);
148 void (*devfs_node_added)(struct hotplug_device*) = NULL;
149 void (*devfs_node_removed)(struct hotplug_device*) = NULL;
152 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function
156 devfs_debug(int level, char *fmt, ...)
161 if (level <= devfs_debug_enable)
169 * devfs_allocp() Allocates a new devfs node with the specified
170 * parameters. The node is also automatically linked into the topology
171 * if a parent is specified. It also calls the rule and alias stuff to
172 * be applied on the new node
175 devfs_allocp(devfs_nodetype devfsnodetype, char *name,
176 struct devfs_node *parent, struct mount *mp, cdev_t dev)
178 struct devfs_node *node = NULL;
179 size_t namlen = strlen(name);
181 node = objcache_get(devfs_node_cache, M_WAITOK);
182 bzero(node, sizeof(*node));
184 atomic_add_long(&(DEVFS_MNTDATA(mp)->leak_count), 1);
189 node->d_dir.d_ino = devfs_fetch_ino();
192 * Cookie jar for children. Leave 0 and 1 for '.' and '..' entries
195 node->cookie_jar = 2;
198 * Access Control members
200 node->mode = DEVFS_DEFAULT_MODE;
201 node->uid = DEVFS_DEFAULT_UID;
202 node->gid = DEVFS_DEFAULT_GID;
204 switch (devfsnodetype) {
207 * Ensure that we don't recycle the root vnode by marking it as
208 * linked into the topology.
210 node->flags |= DEVFS_NODE_LINKED;
212 TAILQ_INIT(DEVFS_DENODE_HEAD(node));
213 node->d_dir.d_type = DT_DIR;
218 node->d_dir.d_type = DT_LNK;
222 node->d_dir.d_type = DT_REG;
227 node->d_dir.d_type = DT_CHR;
230 node->mode = dev->si_perms;
231 node->uid = dev->si_uid;
232 node->gid = dev->si_gid;
234 devfs_alias_check_create(node);
239 panic("devfs_allocp: unknown node type");
243 node->node_type = devfsnodetype;
245 /* Initialize the dirent structure of each devfs vnode */
246 KKASSERT(namlen < 256);
247 node->d_dir.d_namlen = namlen;
248 node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK);
249 memcpy(node->d_dir.d_name, name, namlen);
250 node->d_dir.d_name[namlen] = '\0';
252 /* Initialize the parent node element */
253 node->parent = parent;
256 devfs_rule_check_apply(node, NULL);
258 /* Initialize *time members */
259 nanotime(&node->atime);
260 node->mtime = node->ctime = node->atime;
263 * Associate with parent as last step, clean out namecache
266 if ((parent != NULL) &&
267 ((parent->node_type == Proot) || (parent->node_type == Pdir))) {
269 node->cookie = parent->cookie_jar++;
270 node->flags |= DEVFS_NODE_LINKED;
271 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link);
273 /* This forces negative namecache lookups to clear */
274 ++mp->mnt_namecache_gen;
277 ++DEVFS_MNTDATA(mp)->file_count;
283 * devfs_allocv() allocates a new vnode based on a devfs node.
286 devfs_allocv(struct vnode **vpp, struct devfs_node *node)
294 while ((vp = node->v_node) != NULL) {
295 error = vget(vp, LK_EXCLUSIVE);
296 if (error != ENOENT) {
302 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0)
307 if (node->v_node != NULL) {
316 switch (node->node_type) {
333 KKASSERT(node->d_dev);
335 vp->v_uminor = node->d_dev->si_uminor;
338 v_associate_rdev(vp, node->d_dev);
339 vp->v_ops = &node->mp->mnt_vn_spec_ops;
343 panic("devfs_allocv: unknown node type");
351 * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode
352 * based on the newly created devfs node.
355 devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype,
356 char *name, struct devfs_node *parent, cdev_t dev)
358 struct devfs_node *node;
360 node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
363 devfs_allocv(vpp, node);
371 * Destroy the devfs_node. The node must be unlinked from the topology.
373 * This function will also destroy any vnode association with the node
376 * The cdev_t itself remains intact.
379 devfs_freep(struct devfs_node *node)
384 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) ||
385 (node->node_type == Proot));
386 KKASSERT((node->flags & DEVFS_DESTROYED) == 0);
388 atomic_subtract_long(&(DEVFS_MNTDATA(node->mp)->leak_count), 1);
389 if (node->symlink_name) {
390 kfree(node->symlink_name, M_DEVFS);
391 node->symlink_name = NULL;
395 * Remove the node from the orphan list if it is still on it.
397 if (node->flags & DEVFS_ORPHANED)
398 devfs_tracer_del_orphan(node);
401 * Disassociate the vnode from the node. This also prevents the
402 * vnode's reclaim code from double-freeing the node.
404 * The vget is needed to safely modify the vp. It also serves
405 * to cycle the refs and terminate the vnode if it happens to
406 * be inactive, otherwise namecache references may not get cleared.
408 while ((vp = node->v_node) != NULL) {
409 if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0)
414 cache_inval_vp(vp, CINV_DESTROY);
417 if (node->d_dir.d_name) {
418 kfree(node->d_dir.d_name, M_DEVFS);
419 node->d_dir.d_name = NULL;
421 node->flags |= DEVFS_DESTROYED;
423 --DEVFS_MNTDATA(node->mp)->file_count;
425 objcache_put(devfs_node_cache, node);
431 * Unlink the devfs node from the topology and add it to the orphan list.
432 * The node will later be destroyed by freep.
434 * Any vnode association, including the v_rdev and v_data, remains intact
438 devfs_unlinkp(struct devfs_node *node)
440 struct devfs_node *parent;
441 struct hotplug_device *hpdev;
445 * Add the node to the orphan list, so it is referenced somewhere, to
446 * so we don't leak it.
448 devfs_tracer_add_orphan(node);
450 parent = node->parent;
453 * If the parent is known we can unlink the node out of the topology
456 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
458 KKASSERT((parent->nchildren >= 0));
459 node->flags &= ~DEVFS_NODE_LINKED;
461 /* hotplug handler */
462 if(devfs_node_removed) {
463 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK);
464 hpdev->dev = node->d_dev;
466 hpdev->name = node->d_dev->si_name;
467 devfs_node_removed(hpdev);
468 kfree(hpdev, M_TEMP);
475 devfs_iterate_topology(struct devfs_node *node,
476 devfs_iterate_callback_t *callback, void *arg1)
478 struct devfs_node *node1, *node2;
481 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
482 if (node->nchildren > 2) {
483 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node),
485 if ((ret = devfs_iterate_topology(node1, callback, arg1)))
491 ret = callback(node, arg1);
496 * devfs_reaperp() is a recursive function that iterates through all the
497 * topology, unlinking and freeing all devfs nodes.
500 devfs_reaperp_callback(struct devfs_node *node, void *unused)
509 devfs_gc_dirs_callback(struct devfs_node *node, void *unused)
511 if (node->node_type == Pdir) {
512 if (node->nchildren == 2) {
522 devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target)
524 if ((node->node_type == Plink) && (node->link_target == target)) {
533 * devfs_gc() is devfs garbage collector. It takes care of unlinking and
534 * freeing a node, but also removes empty directories and links that link
535 * via devfs auto-link mechanism to the node being deleted.
538 devfs_gc(struct devfs_node *node)
540 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
542 if (node->nlinks > 0)
543 devfs_iterate_topology(root_node,
544 (devfs_iterate_callback_t *)devfs_gc_links_callback, node);
547 devfs_iterate_topology(root_node,
548 (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL);
556 * devfs_create_dev() is the asynchronous entry point for device creation.
557 * It just sends a message with the relevant details to the devfs core.
559 * This function will reference the passed device. The reference is owned
560 * by devfs and represents all of the device's node associations.
563 devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
566 devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
572 * devfs_destroy_dev() is the asynchronous entry point for device destruction.
573 * It just sends a message with the relevant details to the devfs core.
576 devfs_destroy_dev(cdev_t dev)
578 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
583 * devfs_mount_add() is the synchronous entry point for adding a new devfs
584 * mount. It sends a synchronous message with the relevant details to the
588 devfs_mount_add(struct devfs_mnt_data *mnt)
592 msg = devfs_msg_get();
594 msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg);
601 * devfs_mount_del() is the synchronous entry point for removing a devfs mount.
602 * It sends a synchronous message with the relevant details to the devfs core.
605 devfs_mount_del(struct devfs_mnt_data *mnt)
609 msg = devfs_msg_get();
611 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
618 * devfs_destroy_subnames() is the synchronous entry point for device
619 * destruction by subname. It just sends a message with the relevant details to
623 devfs_destroy_subnames(char *name)
627 msg = devfs_msg_get();
628 msg->mdv_load = name;
629 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES, msg);
635 devfs_clr_subnames_flag(char *name, uint32_t flag)
639 msg = devfs_msg_get();
640 msg->mdv_flags.name = name;
641 msg->mdv_flags.flag = flag;
642 msg = devfs_msg_send_sync(DEVFS_CLR_SUBNAMES_FLAG, msg);
649 devfs_destroy_subnames_without_flag(char *name, uint32_t flag)
653 msg = devfs_msg_get();
654 msg->mdv_flags.name = name;
655 msg->mdv_flags.flag = flag;
656 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES_WO_FLAG, msg);
663 * devfs_create_all_dev is the asynchronous entry point to trigger device
664 * node creation. It just sends a message with the relevant details to
668 devfs_create_all_dev(struct devfs_node *root)
670 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
675 * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all
676 * devices with a specific set of dev_ops and minor. It just sends a
677 * message with the relevant details to the devfs core.
680 devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor)
682 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor);
687 * devfs_clone_handler_add is the synchronous entry point to add a new
688 * clone handler. It just sends a message with the relevant details to
692 devfs_clone_handler_add(const char *name, d_clone_t *nhandler)
696 msg = devfs_msg_get();
697 msg->mdv_chandler.name = name;
698 msg->mdv_chandler.nhandler = nhandler;
699 msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg);
705 * devfs_clone_handler_del is the synchronous entry point to remove a
706 * clone handler. It just sends a message with the relevant details to
710 devfs_clone_handler_del(const char *name)
714 msg = devfs_msg_get();
715 msg->mdv_chandler.name = name;
716 msg->mdv_chandler.nhandler = NULL;
717 msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg);
723 * devfs_find_device_by_name is the synchronous entry point to find a
724 * device given its name. It sends a synchronous message with the
725 * relevant details to the devfs core and returns the answer.
728 devfs_find_device_by_name(const char *fmt, ...)
739 kvasnrprintf(&target, PATH_MAX, 10, fmt, ap);
742 msg = devfs_msg_get();
743 msg->mdv_name = target;
744 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
745 found = msg->mdv_cdev;
753 * devfs_find_device_by_udev is the synchronous entry point to find a
754 * device given its udev number. It sends a synchronous message with
755 * the relevant details to the devfs core and returns the answer.
758 devfs_find_device_by_udev(udev_t udev)
763 msg = devfs_msg_get();
764 msg->mdv_udev = udev;
765 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
766 found = msg->mdv_cdev;
769 devfs_debug(DEVFS_DEBUG_DEBUG,
770 "devfs_find_device_by_udev found? %s -end:3-\n",
771 ((found) ? found->si_name:"NO"));
776 devfs_inode_to_vnode(struct mount *mp, ino_t target)
778 struct vnode *vp = NULL;
784 msg = devfs_msg_get();
785 msg->mdv_ino.mp = mp;
786 msg->mdv_ino.ino = target;
787 msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg);
788 vp = msg->mdv_ino.vp;
789 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
796 * devfs_make_alias is the asynchronous entry point to register an alias
797 * for a device. It just sends a message with the relevant details to the
801 devfs_make_alias(const char *name, cdev_t dev_target)
803 struct devfs_alias *alias;
808 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
809 alias->name = kstrdup(name, M_DEVFS);
811 alias->dev_target = dev_target;
813 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
818 * devfs_apply_rules is the asynchronous entry point to trigger application
819 * of all rules. It just sends a message with the relevant details to the
823 devfs_apply_rules(char *mntto)
827 new_name = kstrdup(mntto, M_DEVFS);
828 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
834 * devfs_reset_rules is the asynchronous entry point to trigger reset of all
835 * rules. It just sends a message with the relevant details to the devfs core.
838 devfs_reset_rules(char *mntto)
842 new_name = kstrdup(mntto, M_DEVFS);
843 devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
850 * devfs_scan_callback is the asynchronous entry point to call a callback
852 * It just sends a message with the relevant details to the devfs core.
855 devfs_scan_callback(devfs_scan_t *callback)
859 KKASSERT(sizeof(callback) == sizeof(void *));
861 msg = devfs_msg_get();
862 msg->mdv_load = callback;
863 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
871 * Acts as a message drain. Any message that is replied to here gets destroyed
872 * and the memory freed.
875 devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
877 devfs_msg_put((devfs_msg_t)msg);
881 * devfs_msg_get allocates a new devfs msg and returns it.
886 return objcache_get(devfs_msg_cache, M_WAITOK);
890 * devfs_msg_put deallocates a given devfs msg.
893 devfs_msg_put(devfs_msg_t msg)
895 objcache_put(devfs_msg_cache, msg);
900 * devfs_msg_send is the generic asynchronous message sending facility
901 * for devfs. By default the reply port is the automatic disposal port.
903 * If the current thread is the devfs_msg_port thread we execute the
904 * operation synchronously.
907 devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
909 lwkt_port_t port = &devfs_msg_port;
911 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
913 devfs_msg->hdr.u.ms_result = cmd;
915 if (port->mpu_td == curthread) {
916 devfs_msg_exec(devfs_msg);
917 lwkt_replymsg(&devfs_msg->hdr, 0);
919 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
924 * devfs_msg_send_sync is the generic synchronous message sending
925 * facility for devfs. It initializes a local reply port and waits
926 * for the core's answer. This answer is then returned.
929 devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg)
931 struct lwkt_port rep_port;
932 devfs_msg_t msg_incoming;
933 lwkt_port_t port = &devfs_msg_port;
935 lwkt_initport_thread(&rep_port, curthread);
936 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
938 devfs_msg->hdr.u.ms_result = cmd;
940 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
941 msg_incoming = lwkt_waitport(&rep_port, 0);
947 * sends a message with a generic argument.
950 devfs_msg_send_generic(uint32_t cmd, void *load)
952 devfs_msg_t devfs_msg = devfs_msg_get();
954 devfs_msg->mdv_load = load;
955 devfs_msg_send(cmd, devfs_msg);
959 * sends a message with a name argument.
962 devfs_msg_send_name(uint32_t cmd, char *name)
964 devfs_msg_t devfs_msg = devfs_msg_get();
966 devfs_msg->mdv_name = name;
967 devfs_msg_send(cmd, devfs_msg);
971 * sends a message with a mount argument.
974 devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt)
976 devfs_msg_t devfs_msg = devfs_msg_get();
978 devfs_msg->mdv_mnt = mnt;
979 devfs_msg_send(cmd, devfs_msg);
983 * sends a message with an ops argument.
986 devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor)
988 devfs_msg_t devfs_msg = devfs_msg_get();
990 devfs_msg->mdv_ops.ops = ops;
991 devfs_msg->mdv_ops.minor = minor;
992 devfs_msg_send(cmd, devfs_msg);
996 * sends a message with a clone handler argument.
999 devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler)
1001 devfs_msg_t devfs_msg = devfs_msg_get();
1003 devfs_msg->mdv_chandler.name = name;
1004 devfs_msg->mdv_chandler.nhandler = handler;
1005 devfs_msg_send(cmd, devfs_msg);
1009 * sends a message with a device argument.
1012 devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms)
1014 devfs_msg_t devfs_msg = devfs_msg_get();
1016 devfs_msg->mdv_dev.dev = dev;
1017 devfs_msg->mdv_dev.uid = uid;
1018 devfs_msg->mdv_dev.gid = gid;
1019 devfs_msg->mdv_dev.perms = perms;
1021 devfs_msg_send(cmd, devfs_msg);
1025 * sends a message with a link argument.
1028 devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp)
1030 devfs_msg_t devfs_msg = devfs_msg_get();
1032 devfs_msg->mdv_link.name = name;
1033 devfs_msg->mdv_link.target = target;
1034 devfs_msg->mdv_link.mp = mp;
1035 devfs_msg_send(cmd, devfs_msg);
1039 * devfs_msg_core is the main devfs thread. It handles all incoming messages
1040 * and calls the relevant worker functions. By using messages it's assured
1041 * that events occur in the correct order.
1044 devfs_msg_core(void *arg)
1049 lwkt_initport_thread(&devfs_msg_port, curthread);
1053 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0);
1054 devfs_debug(DEVFS_DEBUG_DEBUG,
1055 "devfs_msg_core, new msg: %x\n",
1056 (unsigned int)msg->hdr.u.ms_result);
1057 devfs_msg_exec(msg);
1058 lwkt_replymsg(&msg->hdr, 0);
1065 devfs_msg_exec(devfs_msg_t msg)
1067 struct devfs_mnt_data *mnt;
1068 struct devfs_node *node;
1072 * Acquire the devfs lock to ensure safety of all called functions
1074 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1076 switch (msg->hdr.u.ms_result) {
1077 case DEVFS_DEVICE_CREATE:
1078 dev = msg->mdv_dev.dev;
1079 devfs_create_dev_worker(dev,
1082 msg->mdv_dev.perms);
1084 case DEVFS_DEVICE_DESTROY:
1085 dev = msg->mdv_dev.dev;
1086 devfs_destroy_dev_worker(dev);
1088 case DEVFS_DESTROY_SUBNAMES:
1089 devfs_destroy_subnames_worker(msg->mdv_load);
1091 case DEVFS_DESTROY_DEV_BY_OPS:
1092 devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops,
1093 msg->mdv_ops.minor);
1095 case DEVFS_CREATE_ALL_DEV:
1096 node = (struct devfs_node *)msg->mdv_load;
1097 devfs_create_all_dev_worker(node);
1099 case DEVFS_MOUNT_ADD:
1101 TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link);
1102 devfs_create_all_dev_worker(mnt->root_node);
1104 case DEVFS_MOUNT_DEL:
1106 TAILQ_REMOVE(&devfs_mnt_list, mnt, link);
1107 devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback,
1109 if (mnt->leak_count) {
1110 devfs_debug(DEVFS_DEBUG_SHOW,
1111 "Leaked %ld devfs_node elements!\n",
1115 case DEVFS_CHANDLER_ADD:
1116 devfs_chandler_add_worker(msg->mdv_chandler.name,
1117 msg->mdv_chandler.nhandler);
1119 case DEVFS_CHANDLER_DEL:
1120 devfs_chandler_del_worker(msg->mdv_chandler.name);
1122 case DEVFS_FIND_DEVICE_BY_NAME:
1123 devfs_find_device_by_name_worker(msg);
1125 case DEVFS_FIND_DEVICE_BY_UDEV:
1126 devfs_find_device_by_udev_worker(msg);
1128 case DEVFS_MAKE_ALIAS:
1129 devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load);
1131 case DEVFS_APPLY_RULES:
1132 devfs_apply_reset_rules_caller(msg->mdv_name, 1);
1134 case DEVFS_RESET_RULES:
1135 devfs_apply_reset_rules_caller(msg->mdv_name, 0);
1137 case DEVFS_SCAN_CALLBACK:
1138 devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load);
1140 case DEVFS_CLR_SUBNAMES_FLAG:
1141 devfs_clr_subnames_flag_worker(msg->mdv_flags.name,
1142 msg->mdv_flags.flag);
1144 case DEVFS_DESTROY_SUBNAMES_WO_FLAG:
1145 devfs_destroy_subnames_without_flag_worker(msg->mdv_flags.name,
1146 msg->mdv_flags.flag);
1148 case DEVFS_INODE_TO_VNODE:
1149 msg->mdv_ino.vp = devfs_iterate_topology(
1150 DEVFS_MNTDATA(msg->mdv_ino.mp)->root_node,
1151 (devfs_iterate_callback_t *)devfs_inode_to_vnode_worker_callback,
1154 case DEVFS_TERMINATE_CORE:
1160 devfs_debug(DEVFS_DEBUG_WARNING,
1161 "devfs_msg_core: unknown message "
1162 "received at core\n");
1165 lockmgr(&devfs_lock, LK_RELEASE);
1169 * Worker function to insert a new dev into the dev list and initialize its
1170 * permissions. It also calls devfs_propagate_dev which in turn propagates
1171 * the change to all mount points.
1173 * The passed dev is already referenced. This reference is eaten by this
1174 * function and represents the dev's linkage into devfs_dev_list.
1177 devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms)
1183 dev->si_perms = perms;
1185 devfs_link_dev(dev);
1186 devfs_propagate_dev(dev, 1);
1192 * Worker function to delete a dev from the dev list and free the cdev.
1193 * It also calls devfs_propagate_dev which in turn propagates the change
1194 * to all mount points.
1197 devfs_destroy_dev_worker(cdev_t dev)
1202 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1204 error = devfs_unlink_dev(dev);
1205 devfs_propagate_dev(dev, 0);
1207 release_dev(dev); /* link ref */
1215 * Worker function to destroy all devices with a certain basename.
1216 * Calls devfs_destroy_dev_worker for the actual destruction.
1219 devfs_destroy_subnames_worker(char *name)
1222 size_t len = strlen(name);
1224 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1225 if ((!strncmp(dev->si_name, name, len)) &&
1226 (dev->si_name[len] != '\0')) {
1227 devfs_destroy_dev_worker(dev);
1234 devfs_clr_subnames_flag_worker(char *name, uint32_t flag)
1237 size_t len = strlen(name);
1239 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1240 if ((!strncmp(dev->si_name, name, len)) &&
1241 (dev->si_name[len] != '\0')) {
1242 dev->si_flags &= ~flag;
1250 devfs_destroy_subnames_without_flag_worker(char *name, uint32_t flag)
1253 size_t len = strlen(name);
1255 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1256 if ((!strncmp(dev->si_name, name, len)) &&
1257 (dev->si_name[len] != '\0')) {
1258 if (!(dev->si_flags & flag)) {
1259 devfs_destroy_dev_worker(dev);
1268 * Worker function that creates all device nodes on top of a devfs
1272 devfs_create_all_dev_worker(struct devfs_node *root)
1278 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1279 devfs_create_device_node(root, dev, NULL, NULL);
1286 * Worker function that destroys all devices that match a specific
1287 * dev_ops and/or minor. If minor is less than 0, it is not matched
1288 * against. It also propagates all changes.
1291 devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor)
1297 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1298 if (dev->si_ops != ops)
1300 if ((minor < 0) || (dev->si_uminor == minor)) {
1301 devfs_destroy_dev_worker(dev);
1309 * Worker function that registers a new clone handler in devfs.
1312 devfs_chandler_add_worker(const char *name, d_clone_t *nhandler)
1314 struct devfs_clone_handler *chandler = NULL;
1315 u_char len = strlen(name);
1320 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1321 if (chandler->namlen != len)
1324 if (!memcmp(chandler->name, name, len)) {
1325 /* Clonable basename already exists */
1330 chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO);
1331 chandler->name = kstrdup(name, M_DEVFS);
1332 chandler->namlen = len;
1333 chandler->nhandler = nhandler;
1335 TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link);
1340 * Worker function that removes a given clone handler from the
1341 * clone handler list.
1344 devfs_chandler_del_worker(const char *name)
1346 struct devfs_clone_handler *chandler, *chandler2;
1347 u_char len = strlen(name);
1352 TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) {
1353 if (chandler->namlen != len)
1355 if (memcmp(chandler->name, name, len))
1358 TAILQ_REMOVE(&devfs_chandler_list, chandler, link);
1359 kfree(chandler->name, M_DEVFS);
1360 kfree(chandler, M_DEVFS);
1368 * Worker function that finds a given device name and changes
1369 * the message received accordingly so that when replied to,
1370 * the answer is returned to the caller.
1373 devfs_find_device_by_name_worker(devfs_msg_t devfs_msg)
1375 struct devfs_alias *alias;
1377 cdev_t found = NULL;
1379 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1380 if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) {
1385 if (found == NULL) {
1386 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1387 if (strcmp(devfs_msg->mdv_name, alias->name) == 0) {
1388 found = alias->dev_target;
1393 devfs_msg->mdv_cdev = found;
1399 * Worker function that finds a given device udev and changes
1400 * the message received accordingly so that when replied to,
1401 * the answer is returned to the caller.
1404 devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg)
1407 cdev_t found = NULL;
1409 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1410 if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) {
1415 devfs_msg->mdv_cdev = found;
1421 * Worker function that inserts a given alias into the
1422 * alias list, and propagates the alias to all mount
1426 devfs_make_alias_worker(struct devfs_alias *alias)
1428 struct devfs_alias *alias2;
1429 size_t len = strlen(alias->name);
1432 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1433 if (len != alias2->namlen)
1436 if (!memcmp(alias->name, alias2->name, len)) {
1444 * The alias doesn't exist yet, so we add it to the alias list
1446 TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link);
1447 devfs_alias_propagate(alias);
1449 devfs_debug(DEVFS_DEBUG_WARNING,
1450 "Warning: duplicate devfs_make_alias for %s\n",
1452 kfree(alias->name, M_DEVFS);
1453 kfree(alias, M_DEVFS);
1460 * Function that removes and frees all aliases.
1463 devfs_alias_reap(void)
1465 struct devfs_alias *alias, *alias2;
1467 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1468 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1469 kfree(alias, M_DEVFS);
1475 * Function that removes an alias matching a specific cdev and frees
1479 devfs_alias_remove(cdev_t dev)
1481 struct devfs_alias *alias, *alias2;
1483 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1484 if (alias->dev_target == dev) {
1485 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1486 kfree(alias, M_DEVFS);
1493 * This function propagates a new alias to all mount points.
1496 devfs_alias_propagate(struct devfs_alias *alias)
1498 struct devfs_mnt_data *mnt;
1500 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1501 devfs_alias_apply(mnt->root_node, alias);
1507 * This function is a recursive function iterating through
1508 * all device nodes in the topology and, if applicable,
1509 * creating the relevant alias for a device node.
1512 devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias)
1514 struct devfs_node *node1, *node2;
1516 KKASSERT(alias != NULL);
1518 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
1519 if (node->nchildren > 2) {
1520 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
1521 devfs_alias_apply(node1, alias);
1525 if (node->d_dev == alias->dev_target)
1526 devfs_alias_create(alias->name, node, 0);
1532 * This function checks if any alias possibly is applicable
1533 * to the given node. If so, the alias is created.
1536 devfs_alias_check_create(struct devfs_node *node)
1538 struct devfs_alias *alias;
1540 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1541 if (node->d_dev == alias->dev_target)
1542 devfs_alias_create(alias->name, node, 0);
1548 * This function creates an alias with a given name
1549 * linking to a given devfs node. It also increments
1550 * the link count on the target node.
1553 devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based)
1555 struct mount *mp = target->mp;
1556 struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node;
1557 struct devfs_node *linknode;
1558 struct hotplug_device *hpdev;
1559 char *create_path = NULL;
1564 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1566 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1567 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name);
1570 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1573 if (devfs_find_device_node_by_name(parent, name)) {
1574 devfs_debug(DEVFS_DEBUG_WARNING,
1575 "Node already exists: %s "
1576 "(devfs_make_alias_worker)!\n",
1582 linknode = devfs_allocp(Plink, name, parent, mp, NULL);
1583 if (linknode == NULL) {
1588 linknode->link_target = target;
1592 linknode->flags |= DEVFS_RULE_CREATED;
1595 /* hotplug handler */
1596 if(devfs_node_added) {
1597 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK);
1598 hpdev->dev = target->d_dev;
1599 hpdev->name = name_orig;
1600 devfs_node_added(hpdev);
1601 kfree(hpdev, M_TEMP);
1603 kfree(name_buf, M_TEMP);
1608 * This function is called by the core and handles mount point
1609 * strings. It either calls the relevant worker (devfs_apply_
1610 * reset_rules_worker) on all mountpoints or only a specific
1614 devfs_apply_reset_rules_caller(char *mountto, int apply)
1616 struct devfs_mnt_data *mnt;
1618 if (mountto[0] == '*') {
1619 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1620 devfs_iterate_topology(mnt->root_node,
1621 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1625 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1626 if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) {
1627 devfs_iterate_topology(mnt->root_node,
1628 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1635 kfree(mountto, M_DEVFS);
1640 * This function calls a given callback function for
1641 * every dev node in the devfs dev list.
1644 devfs_scan_callback_worker(devfs_scan_t *callback)
1648 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1656 * This function tries to resolve a given directory, or if not
1657 * found and creation requested, creates the given directory.
1659 static struct devfs_node *
1660 devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name,
1661 size_t name_len, int create)
1663 struct devfs_node *node, *found = NULL;
1665 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1666 if (name_len != node->d_dir.d_namlen)
1669 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) {
1675 if ((found == NULL) && (create)) {
1676 found = devfs_allocp(Pdir, dir_name, parent, parent->mp, NULL);
1683 * This function tries to resolve a complete path. If creation is requested,
1684 * if a given part of the path cannot be resolved (because it doesn't exist),
1688 devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create)
1690 struct devfs_node *node = parent;
1697 buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1699 while (*path && idx < PATH_MAX - 1) {
1704 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1714 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1715 kfree (buf, M_TEMP);
1720 * Takes a full path and strips it into a directory path and a name.
1721 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It
1722 * requires a working buffer with enough size to keep the whole
1726 devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep)
1730 size_t len = strlen(fullpath) + 1;
1733 KKASSERT((fullpath != NULL) && (buf != NULL));
1734 KKASSERT((pathp != NULL) && (namep != NULL));
1736 memcpy(buf, fullpath, len);
1738 for (i = len-1; i>= 0; i--) {
1739 if (buf[i] == '/') {
1759 * This function creates a new devfs node for a given device. It can
1760 * handle a complete path as device name, and accordingly creates
1761 * the path and the final device node.
1763 * The reference count on the passed dev remains unchanged.
1766 devfs_create_device_node(struct devfs_node *root, cdev_t dev,
1767 char *dev_name, char *path_fmt, ...)
1769 struct devfs_node *parent, *node = NULL;
1770 struct hotplug_device *hpdev;
1776 char *create_path = NULL;
1777 char *names = "pqrsPQRS";
1779 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1781 if (path_fmt != NULL) {
1782 __va_start(ap, path_fmt);
1783 kvasnrprintf(&path, PATH_MAX, 10, path_fmt, ap);
1787 parent = devfs_resolve_or_create_path(root, path, 1);
1790 devfs_resolve_name_path(
1791 ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name),
1792 name_buf, &create_path, &name);
1795 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1798 if (devfs_find_device_node_by_name(parent, name)) {
1799 devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: "
1800 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name);
1804 node = devfs_allocp(Pdev, name, parent, parent->mp, dev);
1805 nanotime(&parent->mtime);
1808 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their
1811 if ((dev) && (strlen(dev->si_name) >= 4) &&
1812 (!memcmp(dev->si_name, "ptm/", 4))) {
1813 node->parent->flags |= DEVFS_HIDDEN;
1814 node->flags |= DEVFS_HIDDEN;
1818 * Ugly pty magic, to tag pty devices as such and hide them if needed.
1820 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3)))
1821 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1823 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) {
1825 for (i = 0; i < strlen(names); i++) {
1826 if (name[3] == names[i]) {
1832 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1834 /* hotplug handler */
1835 if(devfs_node_added) {
1836 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK);
1837 hpdev->dev = node->d_dev;
1838 hpdev->name = node->d_dev->si_name;
1839 devfs_node_added(hpdev);
1840 kfree(hpdev, M_TEMP);
1844 kfree(name_buf, M_TEMP);
1850 * This function finds a given device node in the topology with a given
1854 devfs_find_device_node_callback(struct devfs_node *node, cdev_t target)
1856 if ((node->node_type == Pdev) && (node->d_dev == target)) {
1864 * This function finds a device node in the given parent directory by its
1865 * name and returns it.
1868 devfs_find_device_node_by_name(struct devfs_node *parent, char *target)
1870 struct devfs_node *node, *found = NULL;
1871 size_t len = strlen(target);
1873 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1874 if (len != node->d_dir.d_namlen)
1877 if (!memcmp(node->d_dir.d_name, target, len)) {
1887 devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop)
1889 struct vnode *vp = NULL;
1890 ino_t target = *inop;
1892 if (node->d_dir.d_ino == target) {
1895 vget(vp, LK_EXCLUSIVE | LK_RETRY);
1898 devfs_allocv(&vp, node);
1907 * This function takes a cdev and removes its devfs node in the
1908 * given topology. The cdev remains intact.
1911 devfs_destroy_device_node(struct devfs_node *root, cdev_t target)
1913 struct devfs_node *node, *parent;
1916 char *create_path = NULL;
1920 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1921 ksnprintf(name_buf, PATH_MAX, "%s", target->si_name);
1923 devfs_resolve_name_path(target->si_name, name_buf, &create_path, &name);
1926 parent = devfs_resolve_or_create_path(root, create_path, 0);
1933 node = devfs_find_device_node_by_name(parent, name);
1936 nanotime(&node->parent->mtime);
1940 kfree(name_buf, M_TEMP);
1946 * Just set perms and ownership for given node.
1949 devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid,
1950 u_short mode, u_long flags)
1960 * Propagates a device attach/detach to all mount
1961 * points. Also takes care of automatic alias removal
1962 * for a deleted cdev.
1965 devfs_propagate_dev(cdev_t dev, int attach)
1967 struct devfs_mnt_data *mnt;
1969 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1971 /* Device is being attached */
1972 devfs_create_device_node(mnt->root_node, dev,
1975 /* Device is being detached */
1976 devfs_alias_remove(dev);
1977 devfs_destroy_device_node(mnt->root_node, dev);
1984 * devfs_clone either returns a basename from a complete name by
1985 * returning the length of the name without trailing digits, or,
1986 * if clone != 0, calls the device's clone handler to get a new
1987 * device, which in turn is returned in devp.
1990 devfs_clone(cdev_t dev, const char *name, size_t len, int mode,
1994 struct devfs_clone_handler *chandler;
1995 struct dev_clone_args ap;
1997 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1998 if (chandler->namlen != len)
2000 if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) {
2001 lockmgr(&devfs_lock, LK_RELEASE);
2003 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2005 ap.a_head.a_dev = dev;
2011 error = (chandler->nhandler)(&ap);
2024 * Registers a new orphan in the orphan list.
2027 devfs_tracer_add_orphan(struct devfs_node *node)
2029 struct devfs_orphan *orphan;
2032 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK);
2033 orphan->node = node;
2035 KKASSERT((node->flags & DEVFS_ORPHANED) == 0);
2036 node->flags |= DEVFS_ORPHANED;
2037 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link);
2041 * Removes an orphan from the orphan list.
2044 devfs_tracer_del_orphan(struct devfs_node *node)
2046 struct devfs_orphan *orphan;
2050 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) {
2051 if (orphan->node == node) {
2052 node->flags &= ~DEVFS_ORPHANED;
2053 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link);
2054 kfree(orphan, M_DEVFS);
2061 * Counts the orphans in the orphan list, and if cleanup
2062 * is specified, also frees the orphan and removes it from
2066 devfs_tracer_orphan_count(struct mount *mp, int cleanup)
2068 struct devfs_orphan *orphan, *orphan2;
2071 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) {
2074 * If we are instructed to clean up, we do so.
2077 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link);
2078 orphan->node->flags &= ~DEVFS_ORPHANED;
2079 devfs_freep(orphan->node);
2080 kfree(orphan, M_DEVFS);
2088 * Fetch an ino_t from the global d_ino by increasing it
2092 devfs_fetch_ino(void)
2096 spin_lock_wr(&ino_lock);
2098 spin_unlock_wr(&ino_lock);
2104 * Allocates a new cdev and initializes it's most basic
2108 devfs_new_cdev(struct dev_ops *ops, int minor, struct dev_ops *bops)
2110 cdev_t dev = sysref_alloc(&cdev_sysref_class);
2112 sysref_activate(&dev->si_sysref);
2114 bzero(dev, offsetof(struct cdev, si_sysref));
2119 dev->si_drv1 = NULL;
2120 dev->si_drv2 = NULL;
2121 dev->si_lastread = 0; /* time_second */
2122 dev->si_lastwrite = 0; /* time_second */
2127 dev->si_uminor = minor;
2128 dev->si_bops = bops;
2129 /* If there is a backing device, we reference its ops */
2130 dev->si_inode = makeudev(
2131 devfs_reference_ops((bops)?(bops):(ops)),
2138 devfs_cdev_terminate(cdev_t dev)
2142 /* Check if it is locked already. if not, we acquire the devfs lock */
2143 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
2144 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2148 /* Propagate destruction, just in case */
2149 devfs_propagate_dev(dev, 0);
2151 /* If we acquired the lock, we also get rid of it */
2153 lockmgr(&devfs_lock, LK_RELEASE);
2155 /* If there is a backing device, we release the backing device's ops */
2156 devfs_release_ops((dev->si_bops)?(dev->si_bops):(dev->si_ops));
2158 /* Finally destroy the device */
2159 sysref_put(&dev->si_sysref);
2163 * Links a given cdev into the dev list.
2166 devfs_link_dev(cdev_t dev)
2168 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
2169 dev->si_flags |= SI_DEVFS_LINKED;
2170 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link);
2176 * Removes a given cdev from the dev list. The caller is responsible for
2177 * releasing the reference on the device associated with the linkage.
2179 * Returns EALREADY if the dev has already been unlinked.
2182 devfs_unlink_dev(cdev_t dev)
2184 if ((dev->si_flags & SI_DEVFS_LINKED)) {
2185 TAILQ_REMOVE(&devfs_dev_list, dev, link);
2186 dev->si_flags &= ~SI_DEVFS_LINKED;
2193 devfs_node_is_accessible(struct devfs_node *node)
2195 if ((node) && (!(node->flags & DEVFS_HIDDEN)))
2202 devfs_reference_ops(struct dev_ops *ops)
2205 struct devfs_dev_ops *found = NULL;
2206 struct devfs_dev_ops *devops;
2208 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2209 if (devops->ops == ops) {
2216 found = kmalloc(sizeof(struct devfs_dev_ops), M_DEVFS, M_WAITOK);
2218 found->ref_count = 0;
2219 TAILQ_INSERT_TAIL(&devfs_dev_ops_list, found, link);
2224 if (found->ref_count == 0) {
2225 found->id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255);
2226 if (found->id == -1) {
2227 /* Ran out of unique ids */
2228 devfs_debug(DEVFS_DEBUG_WARNING,
2229 "devfs_reference_ops: WARNING: ran out of unique ids\n");
2239 devfs_release_ops(struct dev_ops *ops)
2241 struct devfs_dev_ops *found = NULL;
2242 struct devfs_dev_ops *devops;
2244 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2245 if (devops->ops == ops) {
2255 if (found->ref_count == 0) {
2256 TAILQ_REMOVE(&devfs_dev_ops_list, found, link);
2257 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), found->id);
2258 kfree(found, M_DEVFS);
2267 msg = devfs_msg_get();
2268 msg = devfs_msg_send_sync(DEVFS_SYNC, msg);
2273 * Called on init of devfs; creates the objcaches and
2274 * spawns off the devfs core thread. Also initializes
2280 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n");
2281 /* Create objcaches for nodes, msgs and devs */
2282 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0,
2284 objcache_malloc_alloc,
2285 objcache_malloc_free,
2286 &devfs_node_malloc_args );
2288 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0,
2290 objcache_malloc_alloc,
2291 objcache_malloc_free,
2292 &devfs_msg_malloc_args );
2294 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0,
2296 objcache_malloc_alloc,
2297 objcache_malloc_free,
2298 &devfs_dev_malloc_args );
2300 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id));
2302 /* Initialize the reply-only port which acts as a message drain */
2303 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply);
2305 /* Initialize *THE* devfs lock */
2306 lockinit(&devfs_lock, "devfs_core lock", 0, 0);
2309 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL,
2310 0, 0, "devfs_msg_core");
2312 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2314 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n");
2318 * Called on unload of devfs; takes care of destroying the core
2319 * and the objcaches. Also removes aliases that are no longer needed.
2324 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
2326 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL);
2328 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2329 tsleep(td_core/*devfs_id*/, 0, "devfsc", 10000);
2331 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id));
2333 /* Destroy the objcaches */
2334 objcache_destroy(devfs_msg_cache);
2335 objcache_destroy(devfs_node_cache);
2336 objcache_destroy(devfs_dev_cache);
2342 * This is a sysctl handler to assist userland devname(3) to
2343 * find the device name for a given udev.
2346 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS)
2353 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t))))
2356 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev);
2361 if ((found = devfs_find_device_by_udev(udev)) == NULL)
2364 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1));
2368 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
2369 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)");
2371 SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
2372 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable);
2373 SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable,
2374 0, "Enable DevFS debugging");
2376 SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST,
2378 SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY,
2379 devfs_uninit, NULL);