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>
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);
91 static struct devfs_dev_ops_head devfs_dev_ops_list =
92 TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list);
94 struct lock devfs_lock;
95 static struct lwkt_port devfs_dispose_port;
96 static struct lwkt_port devfs_msg_port;
97 static struct thread *td_core;
99 static struct spinlock ino_lock;
101 static int devfs_debug_enable;
102 static int devfs_run;
104 static ino_t devfs_fetch_ino(void);
105 static int devfs_create_all_dev_worker(struct devfs_node *);
106 static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int);
107 static int devfs_destroy_dev_worker(cdev_t);
108 static int devfs_destroy_subnames_worker(char *);
109 static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int);
110 static int devfs_propagate_dev(cdev_t, int);
111 static int devfs_unlink_dev(cdev_t dev);
112 static void devfs_msg_exec(devfs_msg_t msg);
114 static int devfs_chandler_add_worker(const char *, d_clone_t *);
115 static int devfs_chandler_del_worker(const char *);
117 static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
118 static void devfs_msg_core(void *);
120 static int devfs_find_device_by_name_worker(devfs_msg_t);
121 static int devfs_find_device_by_udev_worker(devfs_msg_t);
123 static int devfs_apply_reset_rules_caller(char *, int);
125 static int devfs_scan_callback_worker(devfs_scan_t *);
127 static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *,
128 char *, size_t, int);
130 static int devfs_make_alias_worker(struct devfs_alias *);
131 static int devfs_alias_remove(cdev_t);
132 static int devfs_alias_reap(void);
133 static int devfs_alias_propagate(struct devfs_alias *);
134 static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *);
135 static int devfs_alias_check_create(struct devfs_node *);
137 static int devfs_clr_subnames_flag_worker(char *, uint32_t);
138 static int devfs_destroy_subnames_without_flag_worker(char *, uint32_t);
140 static void *devfs_reaperp_callback(struct devfs_node *, void *);
141 static void *devfs_gc_dirs_callback(struct devfs_node *, void *);
142 static void *devfs_gc_links_callback(struct devfs_node *, struct devfs_node *);
144 devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *);
147 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function
151 devfs_debug(int level, char *fmt, ...)
156 if (level <= devfs_debug_enable)
164 * devfs_allocp() Allocates a new devfs node with the specified
165 * parameters. The node is also automatically linked into the topology
166 * if a parent is specified. It also calls the rule and alias stuff to
167 * be applied on the new node
170 devfs_allocp(devfs_nodetype devfsnodetype, char *name,
171 struct devfs_node *parent, struct mount *mp, cdev_t dev)
173 struct devfs_node *node = NULL;
174 size_t namlen = strlen(name);
176 node = objcache_get(devfs_node_cache, M_WAITOK);
177 bzero(node, sizeof(*node));
179 atomic_add_long(&(DEVFS_MNTDATA(mp)->leak_count), 1);
184 node->d_dir.d_ino = devfs_fetch_ino();
187 * Cookie jar for children. Leave 0 and 1 for '.' and '..' entries
190 node->cookie_jar = 2;
193 * Access Control members
195 node->mode = DEVFS_DEFAULT_MODE;
196 node->uid = DEVFS_DEFAULT_UID;
197 node->gid = DEVFS_DEFAULT_GID;
199 switch (devfsnodetype) {
202 * Ensure that we don't recycle the root vnode by marking it as
203 * linked into the topology.
205 node->flags |= DEVFS_NODE_LINKED;
207 TAILQ_INIT(DEVFS_DENODE_HEAD(node));
208 node->d_dir.d_type = DT_DIR;
213 node->d_dir.d_type = DT_LNK;
217 node->d_dir.d_type = DT_REG;
222 node->d_dir.d_type = DT_CHR;
225 node->mode = dev->si_perms;
226 node->uid = dev->si_uid;
227 node->gid = dev->si_gid;
229 devfs_alias_check_create(node);
234 panic("devfs_allocp: unknown node type");
238 node->node_type = devfsnodetype;
240 /* Initialize the dirent structure of each devfs vnode */
241 KKASSERT(namlen < 256);
242 node->d_dir.d_namlen = namlen;
243 node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK);
244 memcpy(node->d_dir.d_name, name, namlen);
245 node->d_dir.d_name[namlen] = '\0';
247 /* Initialize the parent node element */
248 node->parent = parent;
251 devfs_rule_check_apply(node, NULL);
253 /* Initialize *time members */
254 nanotime(&node->atime);
255 node->mtime = node->ctime = node->atime;
258 * Associate with parent as last step, clean out namecache
261 if ((parent != NULL) &&
262 ((parent->node_type == Proot) || (parent->node_type == Pdir))) {
264 node->cookie = parent->cookie_jar++;
265 node->flags |= DEVFS_NODE_LINKED;
266 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link);
268 /* This forces negative namecache lookups to clear */
269 ++mp->mnt_namecache_gen;
272 ++DEVFS_MNTDATA(mp)->file_count;
278 * devfs_allocv() allocates a new vnode based on a devfs node.
281 devfs_allocv(struct vnode **vpp, struct devfs_node *node)
289 while ((vp = node->v_node) != NULL) {
290 error = vget(vp, LK_EXCLUSIVE);
291 if (error != ENOENT) {
297 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0)
302 if (node->v_node != NULL) {
311 switch (node->node_type) {
328 KKASSERT(node->d_dev);
330 vp->v_uminor = node->d_dev->si_uminor;
333 v_associate_rdev(vp, node->d_dev);
334 vp->v_ops = &node->mp->mnt_vn_spec_ops;
338 panic("devfs_allocv: unknown node type");
346 * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode
347 * based on the newly created devfs node.
350 devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype,
351 char *name, struct devfs_node *parent, cdev_t dev)
353 struct devfs_node *node;
355 node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
358 devfs_allocv(vpp, node);
366 * Destroy the devfs_node. The node must be unlinked from the topology.
368 * This function will also destroy any vnode association with the node
371 * The cdev_t itself remains intact.
374 devfs_freep(struct devfs_node *node)
379 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) ||
380 (node->node_type == Proot));
381 KKASSERT((node->flags & DEVFS_DESTROYED) == 0);
383 atomic_subtract_long(&(DEVFS_MNTDATA(node->mp)->leak_count), 1);
384 if (node->symlink_name) {
385 kfree(node->symlink_name, M_DEVFS);
386 node->symlink_name = NULL;
390 * Remove the node from the orphan list if it is still on it.
392 if (node->flags & DEVFS_ORPHANED)
393 devfs_tracer_del_orphan(node);
396 * Disassociate the vnode from the node. This also prevents the
397 * vnode's reclaim code from double-freeing the node.
399 * The vget is needed to safely modify the vp. It also serves
400 * to cycle the refs and terminate the vnode if it happens to
401 * be inactive, otherwise namecache references may not get cleared.
403 while ((vp = node->v_node) != NULL) {
404 if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0)
409 cache_inval_vp(vp, CINV_DESTROY);
412 if (node->d_dir.d_name) {
413 kfree(node->d_dir.d_name, M_DEVFS);
414 node->d_dir.d_name = NULL;
416 node->flags |= DEVFS_DESTROYED;
418 --DEVFS_MNTDATA(node->mp)->file_count;
420 objcache_put(devfs_node_cache, node);
426 * Unlink the devfs node from the topology and add it to the orphan list.
427 * The node will later be destroyed by freep.
429 * Any vnode association, including the v_rdev and v_data, remains intact
433 devfs_unlinkp(struct devfs_node *node)
435 struct devfs_node *parent;
439 * Add the node to the orphan list, so it is referenced somewhere, to
440 * so we don't leak it.
442 devfs_tracer_add_orphan(node);
444 parent = node->parent;
447 * If the parent is known we can unlink the node out of the topology
450 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
452 KKASSERT((parent->nchildren >= 0));
453 node->flags &= ~DEVFS_NODE_LINKED;
460 devfs_iterate_topology(struct devfs_node *node,
461 devfs_iterate_callback_t *callback, void *arg1)
463 struct devfs_node *node1, *node2;
466 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
467 if (node->nchildren > 2) {
468 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node),
470 if ((ret = devfs_iterate_topology(node1, callback, arg1)))
476 ret = callback(node, arg1);
481 * devfs_reaperp() is a recursive function that iterates through all the
482 * topology, unlinking and freeing all devfs nodes.
485 devfs_reaperp_callback(struct devfs_node *node, void *unused)
494 devfs_gc_dirs_callback(struct devfs_node *node, void *unused)
496 if (node->node_type == Pdir) {
497 if (node->nchildren == 2) {
507 devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target)
509 if ((node->node_type == Plink) && (node->link_target == target)) {
518 * devfs_gc() is devfs garbage collector. It takes care of unlinking and
519 * freeing a node, but also removes empty directories and links that link
520 * via devfs auto-link mechanism to the node being deleted.
523 devfs_gc(struct devfs_node *node)
525 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
527 if (node->nlinks > 0)
528 devfs_iterate_topology(root_node,
529 (devfs_iterate_callback_t *)devfs_gc_links_callback, node);
532 devfs_iterate_topology(root_node,
533 (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL);
541 * devfs_create_dev() is the asynchronous entry point for device creation.
542 * It just sends a message with the relevant details to the devfs core.
544 * This function will reference the passed device. The reference is owned
545 * by devfs and represents all of the device's node associations.
548 devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
551 devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
557 * devfs_destroy_dev() is the asynchronous entry point for device destruction.
558 * It just sends a message with the relevant details to the devfs core.
561 devfs_destroy_dev(cdev_t dev)
563 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
568 * devfs_mount_add() is the synchronous entry point for adding a new devfs
569 * mount. It sends a synchronous message with the relevant details to the
573 devfs_mount_add(struct devfs_mnt_data *mnt)
577 msg = devfs_msg_get();
579 msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg);
586 * devfs_mount_del() is the synchronous entry point for removing a devfs mount.
587 * It sends a synchronous message with the relevant details to the devfs core.
590 devfs_mount_del(struct devfs_mnt_data *mnt)
594 msg = devfs_msg_get();
596 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
603 * devfs_destroy_subnames() is the synchronous entry point for device
604 * destruction by subname. It just sends a message with the relevant details to
608 devfs_destroy_subnames(char *name)
612 msg = devfs_msg_get();
613 msg->mdv_load = name;
614 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES, msg);
620 devfs_clr_subnames_flag(char *name, uint32_t flag)
624 msg = devfs_msg_get();
625 msg->mdv_flags.name = name;
626 msg->mdv_flags.flag = flag;
627 msg = devfs_msg_send_sync(DEVFS_CLR_SUBNAMES_FLAG, msg);
634 devfs_destroy_subnames_without_flag(char *name, uint32_t flag)
638 msg = devfs_msg_get();
639 msg->mdv_flags.name = name;
640 msg->mdv_flags.flag = flag;
641 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES_WO_FLAG, msg);
648 * devfs_create_all_dev is the asynchronous entry point to trigger device
649 * node creation. It just sends a message with the relevant details to
653 devfs_create_all_dev(struct devfs_node *root)
655 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
660 * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all
661 * devices with a specific set of dev_ops and minor. It just sends a
662 * message with the relevant details to the devfs core.
665 devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor)
667 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor);
672 * devfs_clone_handler_add is the synchronous entry point to add a new
673 * clone handler. It just sends a message with the relevant details to
677 devfs_clone_handler_add(const char *name, d_clone_t *nhandler)
681 msg = devfs_msg_get();
682 msg->mdv_chandler.name = name;
683 msg->mdv_chandler.nhandler = nhandler;
684 msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg);
690 * devfs_clone_handler_del is the synchronous entry point to remove a
691 * clone handler. It just sends a message with the relevant details to
695 devfs_clone_handler_del(const char *name)
699 msg = devfs_msg_get();
700 msg->mdv_chandler.name = name;
701 msg->mdv_chandler.nhandler = NULL;
702 msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg);
708 * devfs_find_device_by_name is the synchronous entry point to find a
709 * device given its name. It sends a synchronous message with the
710 * relevant details to the devfs core and returns the answer.
713 devfs_find_device_by_name(const char *fmt, ...)
724 kvasnrprintf(&target, PATH_MAX, 10, fmt, ap);
727 msg = devfs_msg_get();
728 msg->mdv_name = target;
729 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
730 found = msg->mdv_cdev;
738 * devfs_find_device_by_udev is the synchronous entry point to find a
739 * device given its udev number. It sends a synchronous message with
740 * the relevant details to the devfs core and returns the answer.
743 devfs_find_device_by_udev(udev_t udev)
748 msg = devfs_msg_get();
749 msg->mdv_udev = udev;
750 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
751 found = msg->mdv_cdev;
754 devfs_debug(DEVFS_DEBUG_DEBUG,
755 "devfs_find_device_by_udev found? %s -end:3-\n",
756 ((found) ? found->si_name:"NO"));
761 devfs_inode_to_vnode(struct mount *mp, ino_t target)
763 struct vnode *vp = NULL;
769 msg = devfs_msg_get();
770 msg->mdv_ino.mp = mp;
771 msg->mdv_ino.ino = target;
772 msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg);
773 vp = msg->mdv_ino.vp;
774 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
781 * devfs_make_alias is the asynchronous entry point to register an alias
782 * for a device. It just sends a message with the relevant details to the
786 devfs_make_alias(const char *name, cdev_t dev_target)
788 struct devfs_alias *alias;
793 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
794 alias->name = kstrdup(name, M_DEVFS);
796 alias->dev_target = dev_target;
798 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
803 * devfs_apply_rules is the asynchronous entry point to trigger application
804 * of all rules. It just sends a message with the relevant details to the
808 devfs_apply_rules(char *mntto)
812 new_name = kstrdup(mntto, M_DEVFS);
813 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
819 * devfs_reset_rules is the asynchronous entry point to trigger reset of all
820 * rules. It just sends a message with the relevant details to the devfs core.
823 devfs_reset_rules(char *mntto)
827 new_name = kstrdup(mntto, M_DEVFS);
828 devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
835 * devfs_scan_callback is the asynchronous entry point to call a callback
837 * It just sends a message with the relevant details to the devfs core.
840 devfs_scan_callback(devfs_scan_t *callback)
844 KKASSERT(sizeof(callback) == sizeof(void *));
846 msg = devfs_msg_get();
847 msg->mdv_load = callback;
848 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
856 * Acts as a message drain. Any message that is replied to here gets destroyed
857 * and the memory freed.
860 devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
862 devfs_msg_put((devfs_msg_t)msg);
866 * devfs_msg_get allocates a new devfs msg and returns it.
871 return objcache_get(devfs_msg_cache, M_WAITOK);
875 * devfs_msg_put deallocates a given devfs msg.
878 devfs_msg_put(devfs_msg_t msg)
880 objcache_put(devfs_msg_cache, msg);
885 * devfs_msg_send is the generic asynchronous message sending facility
886 * for devfs. By default the reply port is the automatic disposal port.
888 * If the current thread is the devfs_msg_port thread we execute the
889 * operation synchronously.
892 devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
894 lwkt_port_t port = &devfs_msg_port;
896 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
898 devfs_msg->hdr.u.ms_result = cmd;
900 if (port->mpu_td == curthread) {
901 devfs_msg_exec(devfs_msg);
902 lwkt_replymsg(&devfs_msg->hdr, 0);
904 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
909 * devfs_msg_send_sync is the generic synchronous message sending
910 * facility for devfs. It initializes a local reply port and waits
911 * for the core's answer. This answer is then returned.
914 devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg)
916 struct lwkt_port rep_port;
917 devfs_msg_t msg_incoming;
918 lwkt_port_t port = &devfs_msg_port;
920 lwkt_initport_thread(&rep_port, curthread);
921 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
923 devfs_msg->hdr.u.ms_result = cmd;
925 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
926 msg_incoming = lwkt_waitport(&rep_port, 0);
932 * sends a message with a generic argument.
935 devfs_msg_send_generic(uint32_t cmd, void *load)
937 devfs_msg_t devfs_msg = devfs_msg_get();
939 devfs_msg->mdv_load = load;
940 devfs_msg_send(cmd, devfs_msg);
944 * sends a message with a name argument.
947 devfs_msg_send_name(uint32_t cmd, char *name)
949 devfs_msg_t devfs_msg = devfs_msg_get();
951 devfs_msg->mdv_name = name;
952 devfs_msg_send(cmd, devfs_msg);
956 * sends a message with a mount argument.
959 devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt)
961 devfs_msg_t devfs_msg = devfs_msg_get();
963 devfs_msg->mdv_mnt = mnt;
964 devfs_msg_send(cmd, devfs_msg);
968 * sends a message with an ops argument.
971 devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor)
973 devfs_msg_t devfs_msg = devfs_msg_get();
975 devfs_msg->mdv_ops.ops = ops;
976 devfs_msg->mdv_ops.minor = minor;
977 devfs_msg_send(cmd, devfs_msg);
981 * sends a message with a clone handler argument.
984 devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler)
986 devfs_msg_t devfs_msg = devfs_msg_get();
988 devfs_msg->mdv_chandler.name = name;
989 devfs_msg->mdv_chandler.nhandler = handler;
990 devfs_msg_send(cmd, devfs_msg);
994 * sends a message with a device argument.
997 devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms)
999 devfs_msg_t devfs_msg = devfs_msg_get();
1001 devfs_msg->mdv_dev.dev = dev;
1002 devfs_msg->mdv_dev.uid = uid;
1003 devfs_msg->mdv_dev.gid = gid;
1004 devfs_msg->mdv_dev.perms = perms;
1006 devfs_msg_send(cmd, devfs_msg);
1010 * sends a message with a link argument.
1013 devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp)
1015 devfs_msg_t devfs_msg = devfs_msg_get();
1017 devfs_msg->mdv_link.name = name;
1018 devfs_msg->mdv_link.target = target;
1019 devfs_msg->mdv_link.mp = mp;
1020 devfs_msg_send(cmd, devfs_msg);
1024 * devfs_msg_core is the main devfs thread. It handles all incoming messages
1025 * and calls the relevant worker functions. By using messages it's assured
1026 * that events occur in the correct order.
1029 devfs_msg_core(void *arg)
1034 lwkt_initport_thread(&devfs_msg_port, curthread);
1038 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0);
1039 devfs_debug(DEVFS_DEBUG_DEBUG,
1040 "devfs_msg_core, new msg: %x\n",
1041 (unsigned int)msg->hdr.u.ms_result);
1042 devfs_msg_exec(msg);
1043 lwkt_replymsg(&msg->hdr, 0);
1050 devfs_msg_exec(devfs_msg_t msg)
1052 struct devfs_mnt_data *mnt;
1053 struct devfs_node *node;
1057 * Acquire the devfs lock to ensure safety of all called functions
1059 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1061 switch (msg->hdr.u.ms_result) {
1062 case DEVFS_DEVICE_CREATE:
1063 dev = msg->mdv_dev.dev;
1064 devfs_create_dev_worker(dev,
1067 msg->mdv_dev.perms);
1069 case DEVFS_DEVICE_DESTROY:
1070 dev = msg->mdv_dev.dev;
1071 devfs_destroy_dev_worker(dev);
1073 case DEVFS_DESTROY_SUBNAMES:
1074 devfs_destroy_subnames_worker(msg->mdv_load);
1076 case DEVFS_DESTROY_DEV_BY_OPS:
1077 devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops,
1078 msg->mdv_ops.minor);
1080 case DEVFS_CREATE_ALL_DEV:
1081 node = (struct devfs_node *)msg->mdv_load;
1082 devfs_create_all_dev_worker(node);
1084 case DEVFS_MOUNT_ADD:
1086 TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link);
1087 devfs_create_all_dev_worker(mnt->root_node);
1089 case DEVFS_MOUNT_DEL:
1091 TAILQ_REMOVE(&devfs_mnt_list, mnt, link);
1092 devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback,
1094 if (mnt->leak_count) {
1095 devfs_debug(DEVFS_DEBUG_SHOW,
1096 "Leaked %ld devfs_node elements!\n",
1100 case DEVFS_CHANDLER_ADD:
1101 devfs_chandler_add_worker(msg->mdv_chandler.name,
1102 msg->mdv_chandler.nhandler);
1104 case DEVFS_CHANDLER_DEL:
1105 devfs_chandler_del_worker(msg->mdv_chandler.name);
1107 case DEVFS_FIND_DEVICE_BY_NAME:
1108 devfs_find_device_by_name_worker(msg);
1110 case DEVFS_FIND_DEVICE_BY_UDEV:
1111 devfs_find_device_by_udev_worker(msg);
1113 case DEVFS_MAKE_ALIAS:
1114 devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load);
1116 case DEVFS_APPLY_RULES:
1117 devfs_apply_reset_rules_caller(msg->mdv_name, 1);
1119 case DEVFS_RESET_RULES:
1120 devfs_apply_reset_rules_caller(msg->mdv_name, 0);
1122 case DEVFS_SCAN_CALLBACK:
1123 devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load);
1125 case DEVFS_CLR_SUBNAMES_FLAG:
1126 devfs_clr_subnames_flag_worker(msg->mdv_flags.name,
1127 msg->mdv_flags.flag);
1129 case DEVFS_DESTROY_SUBNAMES_WO_FLAG:
1130 devfs_destroy_subnames_without_flag_worker(msg->mdv_flags.name,
1131 msg->mdv_flags.flag);
1133 case DEVFS_INODE_TO_VNODE:
1134 msg->mdv_ino.vp = devfs_iterate_topology(
1135 DEVFS_MNTDATA(msg->mdv_ino.mp)->root_node,
1136 (devfs_iterate_callback_t *)devfs_inode_to_vnode_worker_callback,
1139 case DEVFS_TERMINATE_CORE:
1145 devfs_debug(DEVFS_DEBUG_WARNING,
1146 "devfs_msg_core: unknown message "
1147 "received at core\n");
1150 lockmgr(&devfs_lock, LK_RELEASE);
1154 * Worker function to insert a new dev into the dev list and initialize its
1155 * permissions. It also calls devfs_propagate_dev which in turn propagates
1156 * the change to all mount points.
1158 * The passed dev is already referenced. This reference is eaten by this
1159 * function and represents the dev's linkage into devfs_dev_list.
1162 devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms)
1168 dev->si_perms = perms;
1170 devfs_link_dev(dev);
1171 devfs_propagate_dev(dev, 1);
1177 * Worker function to delete a dev from the dev list and free the cdev.
1178 * It also calls devfs_propagate_dev which in turn propagates the change
1179 * to all mount points.
1182 devfs_destroy_dev_worker(cdev_t dev)
1187 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1189 error = devfs_unlink_dev(dev);
1190 devfs_propagate_dev(dev, 0);
1192 release_dev(dev); /* link ref */
1200 * Worker function to destroy all devices with a certain basename.
1201 * Calls devfs_destroy_dev_worker for the actual destruction.
1204 devfs_destroy_subnames_worker(char *name)
1207 size_t len = strlen(name);
1209 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1210 if ((!strncmp(dev->si_name, name, len)) &&
1211 (dev->si_name[len] != '\0')) {
1212 devfs_destroy_dev_worker(dev);
1219 devfs_clr_subnames_flag_worker(char *name, uint32_t flag)
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 dev->si_flags &= ~flag;
1235 devfs_destroy_subnames_without_flag_worker(char *name, uint32_t flag)
1238 size_t len = strlen(name);
1240 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1241 if ((!strncmp(dev->si_name, name, len)) &&
1242 (dev->si_name[len] != '\0')) {
1243 if (!(dev->si_flags & flag)) {
1244 devfs_destroy_dev_worker(dev);
1253 * Worker function that creates all device nodes on top of a devfs
1257 devfs_create_all_dev_worker(struct devfs_node *root)
1263 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1264 devfs_create_device_node(root, dev, NULL, NULL);
1271 * Worker function that destroys all devices that match a specific
1272 * dev_ops and/or minor. If minor is less than 0, it is not matched
1273 * against. It also propagates all changes.
1276 devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor)
1282 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1283 if (dev->si_ops != ops)
1285 if ((minor < 0) || (dev->si_uminor == minor)) {
1286 devfs_destroy_dev_worker(dev);
1294 * Worker function that registers a new clone handler in devfs.
1297 devfs_chandler_add_worker(const char *name, d_clone_t *nhandler)
1299 struct devfs_clone_handler *chandler = NULL;
1300 u_char len = strlen(name);
1305 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1306 if (chandler->namlen != len)
1309 if (!memcmp(chandler->name, name, len)) {
1310 /* Clonable basename already exists */
1315 chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO);
1316 chandler->name = kstrdup(name, M_DEVFS);
1317 chandler->namlen = len;
1318 chandler->nhandler = nhandler;
1320 TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link);
1325 * Worker function that removes a given clone handler from the
1326 * clone handler list.
1329 devfs_chandler_del_worker(const char *name)
1331 struct devfs_clone_handler *chandler, *chandler2;
1332 u_char len = strlen(name);
1337 TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) {
1338 if (chandler->namlen != len)
1340 if (memcmp(chandler->name, name, len))
1343 TAILQ_REMOVE(&devfs_chandler_list, chandler, link);
1344 kfree(chandler->name, M_DEVFS);
1345 kfree(chandler, M_DEVFS);
1353 * Worker function that finds a given device name and changes
1354 * the message received accordingly so that when replied to,
1355 * the answer is returned to the caller.
1358 devfs_find_device_by_name_worker(devfs_msg_t devfs_msg)
1360 struct devfs_alias *alias;
1362 cdev_t found = NULL;
1364 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1365 if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) {
1370 if (found == NULL) {
1371 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1372 if (strcmp(devfs_msg->mdv_name, alias->name) == 0) {
1373 found = alias->dev_target;
1378 devfs_msg->mdv_cdev = found;
1384 * Worker function that finds a given device udev and changes
1385 * the message received accordingly so that when replied to,
1386 * the answer is returned to the caller.
1389 devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg)
1392 cdev_t found = NULL;
1394 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1395 if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) {
1400 devfs_msg->mdv_cdev = found;
1406 * Worker function that inserts a given alias into the
1407 * alias list, and propagates the alias to all mount
1411 devfs_make_alias_worker(struct devfs_alias *alias)
1413 struct devfs_alias *alias2;
1414 size_t len = strlen(alias->name);
1417 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1418 if (len != alias2->namlen)
1421 if (!memcmp(alias->name, alias2->name, len)) {
1429 * The alias doesn't exist yet, so we add it to the alias list
1431 TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link);
1432 devfs_alias_propagate(alias);
1434 devfs_debug(DEVFS_DEBUG_WARNING,
1435 "Warning: duplicate devfs_make_alias for %s\n",
1437 kfree(alias->name, M_DEVFS);
1438 kfree(alias, M_DEVFS);
1445 * Function that removes and frees all aliases.
1448 devfs_alias_reap(void)
1450 struct devfs_alias *alias, *alias2;
1452 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1453 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1454 kfree(alias, M_DEVFS);
1460 * Function that removes an alias matching a specific cdev and frees
1464 devfs_alias_remove(cdev_t dev)
1466 struct devfs_alias *alias, *alias2;
1468 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1469 if (alias->dev_target == dev) {
1470 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1471 kfree(alias, M_DEVFS);
1478 * This function propagates a new alias to all mount points.
1481 devfs_alias_propagate(struct devfs_alias *alias)
1483 struct devfs_mnt_data *mnt;
1485 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1486 devfs_alias_apply(mnt->root_node, alias);
1492 * This function is a recursive function iterating through
1493 * all device nodes in the topology and, if applicable,
1494 * creating the relevant alias for a device node.
1497 devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias)
1499 struct devfs_node *node1, *node2;
1501 KKASSERT(alias != NULL);
1503 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
1504 if (node->nchildren > 2) {
1505 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
1506 devfs_alias_apply(node1, alias);
1510 if (node->d_dev == alias->dev_target)
1511 devfs_alias_create(alias->name, node, 0);
1517 * This function checks if any alias possibly is applicable
1518 * to the given node. If so, the alias is created.
1521 devfs_alias_check_create(struct devfs_node *node)
1523 struct devfs_alias *alias;
1525 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1526 if (node->d_dev == alias->dev_target)
1527 devfs_alias_create(alias->name, node, 0);
1533 * This function creates an alias with a given name
1534 * linking to a given devfs node. It also increments
1535 * the link count on the target node.
1538 devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based)
1540 struct mount *mp = target->mp;
1541 struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node;
1542 struct devfs_node *linknode;
1543 char *create_path = NULL;
1548 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1550 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1551 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name);
1554 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1557 if (devfs_find_device_node_by_name(parent, name)) {
1558 devfs_debug(DEVFS_DEBUG_WARNING,
1559 "Node already exists: %s "
1560 "(devfs_make_alias_worker)!\n",
1566 linknode = devfs_allocp(Plink, name, parent, mp, NULL);
1567 if (linknode == NULL) {
1572 linknode->link_target = target;
1576 linknode->flags |= DEVFS_RULE_CREATED;
1579 kfree(name_buf, M_TEMP);
1584 * This function is called by the core and handles mount point
1585 * strings. It either calls the relevant worker (devfs_apply_
1586 * reset_rules_worker) on all mountpoints or only a specific
1590 devfs_apply_reset_rules_caller(char *mountto, int apply)
1592 struct devfs_mnt_data *mnt;
1594 if (mountto[0] == '*') {
1595 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1596 devfs_iterate_topology(mnt->root_node,
1597 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1601 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1602 if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) {
1603 devfs_iterate_topology(mnt->root_node,
1604 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1611 kfree(mountto, M_DEVFS);
1616 * This function calls a given callback function for
1617 * every dev node in the devfs dev list.
1620 devfs_scan_callback_worker(devfs_scan_t *callback)
1624 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1632 * This function tries to resolve a given directory, or if not
1633 * found and creation requested, creates the given directory.
1635 static struct devfs_node *
1636 devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name,
1637 size_t name_len, int create)
1639 struct devfs_node *node, *found = NULL;
1641 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1642 if (name_len != node->d_dir.d_namlen)
1645 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) {
1651 if ((found == NULL) && (create)) {
1652 found = devfs_allocp(Pdir, dir_name, parent, parent->mp, NULL);
1659 * This function tries to resolve a complete path. If creation is requested,
1660 * if a given part of the path cannot be resolved (because it doesn't exist),
1664 devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create)
1666 struct devfs_node *node = parent;
1673 buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1675 while (*path && idx < PATH_MAX - 1) {
1680 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1690 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1691 kfree (buf, M_TEMP);
1696 * Takes a full path and strips it into a directory path and a name.
1697 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It
1698 * requires a working buffer with enough size to keep the whole
1702 devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep)
1706 size_t len = strlen(fullpath) + 1;
1709 KKASSERT((fullpath != NULL) && (buf != NULL));
1710 KKASSERT((pathp != NULL) && (namep != NULL));
1712 memcpy(buf, fullpath, len);
1714 for (i = len-1; i>= 0; i--) {
1715 if (buf[i] == '/') {
1735 * This function creates a new devfs node for a given device. It can
1736 * handle a complete path as device name, and accordingly creates
1737 * the path and the final device node.
1739 * The reference count on the passed dev remains unchanged.
1742 devfs_create_device_node(struct devfs_node *root, cdev_t dev,
1743 char *dev_name, char *path_fmt, ...)
1745 struct devfs_node *parent, *node = NULL;
1751 char *create_path = NULL;
1752 char *names = "pqrsPQRS";
1754 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1756 if (path_fmt != NULL) {
1757 __va_start(ap, path_fmt);
1758 kvasnrprintf(&path, PATH_MAX, 10, path_fmt, ap);
1762 parent = devfs_resolve_or_create_path(root, path, 1);
1765 devfs_resolve_name_path(
1766 ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name),
1767 name_buf, &create_path, &name);
1770 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1773 if (devfs_find_device_node_by_name(parent, name)) {
1774 devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: "
1775 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name);
1779 node = devfs_allocp(Pdev, name, parent, parent->mp, dev);
1780 nanotime(&parent->mtime);
1783 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their
1786 if ((dev) && (strlen(dev->si_name) >= 4) &&
1787 (!memcmp(dev->si_name, "ptm/", 4))) {
1788 node->parent->flags |= DEVFS_HIDDEN;
1789 node->flags |= DEVFS_HIDDEN;
1793 * Ugly pty magic, to tag pty devices as such and hide them if needed.
1795 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3)))
1796 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1798 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) {
1800 for (i = 0; i < strlen(names); i++) {
1801 if (name[3] == names[i]) {
1807 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1811 kfree(name_buf, M_TEMP);
1817 * This function finds a given device node in the topology with a given
1821 devfs_find_device_node_callback(struct devfs_node *node, cdev_t target)
1823 if ((node->node_type == Pdev) && (node->d_dev == target)) {
1831 * This function finds a device node in the given parent directory by its
1832 * name and returns it.
1835 devfs_find_device_node_by_name(struct devfs_node *parent, char *target)
1837 struct devfs_node *node, *found = NULL;
1838 size_t len = strlen(target);
1840 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1841 if (len != node->d_dir.d_namlen)
1844 if (!memcmp(node->d_dir.d_name, target, len)) {
1854 devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop)
1856 struct vnode *vp = NULL;
1857 ino_t target = *inop;
1859 if (node->d_dir.d_ino == target) {
1862 vget(vp, LK_EXCLUSIVE | LK_RETRY);
1865 devfs_allocv(&vp, node);
1874 * This function takes a cdev and removes its devfs node in the
1875 * given topology. The cdev remains intact.
1878 devfs_destroy_device_node(struct devfs_node *root, cdev_t target)
1880 struct devfs_node *node, *parent;
1883 char *create_path = NULL;
1887 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1888 ksnprintf(name_buf, PATH_MAX, "%s", target->si_name);
1890 devfs_resolve_name_path(target->si_name, name_buf, &create_path, &name);
1893 parent = devfs_resolve_or_create_path(root, create_path, 0);
1900 node = devfs_find_device_node_by_name(parent, name);
1903 nanotime(&node->parent->mtime);
1906 kfree(name_buf, M_TEMP);
1912 * Just set perms and ownership for given node.
1915 devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid,
1916 u_short mode, u_long flags)
1926 * Propagates a device attach/detach to all mount
1927 * points. Also takes care of automatic alias removal
1928 * for a deleted cdev.
1931 devfs_propagate_dev(cdev_t dev, int attach)
1933 struct devfs_mnt_data *mnt;
1935 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1937 /* Device is being attached */
1938 devfs_create_device_node(mnt->root_node, dev,
1941 /* Device is being detached */
1942 devfs_alias_remove(dev);
1943 devfs_destroy_device_node(mnt->root_node, dev);
1950 * devfs_clone either returns a basename from a complete name by
1951 * returning the length of the name without trailing digits, or,
1952 * if clone != 0, calls the device's clone handler to get a new
1953 * device, which in turn is returned in devp.
1956 devfs_clone(cdev_t dev, const char *name, size_t len, int mode,
1960 struct devfs_clone_handler *chandler;
1961 struct dev_clone_args ap;
1963 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1964 if (chandler->namlen != len)
1966 if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) {
1967 lockmgr(&devfs_lock, LK_RELEASE);
1969 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1971 ap.a_head.a_dev = dev;
1977 error = (chandler->nhandler)(&ap);
1990 * Registers a new orphan in the orphan list.
1993 devfs_tracer_add_orphan(struct devfs_node *node)
1995 struct devfs_orphan *orphan;
1998 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK);
1999 orphan->node = node;
2001 KKASSERT((node->flags & DEVFS_ORPHANED) == 0);
2002 node->flags |= DEVFS_ORPHANED;
2003 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link);
2007 * Removes an orphan from the orphan list.
2010 devfs_tracer_del_orphan(struct devfs_node *node)
2012 struct devfs_orphan *orphan;
2016 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) {
2017 if (orphan->node == node) {
2018 node->flags &= ~DEVFS_ORPHANED;
2019 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link);
2020 kfree(orphan, M_DEVFS);
2027 * Counts the orphans in the orphan list, and if cleanup
2028 * is specified, also frees the orphan and removes it from
2032 devfs_tracer_orphan_count(struct mount *mp, int cleanup)
2034 struct devfs_orphan *orphan, *orphan2;
2037 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) {
2040 * If we are instructed to clean up, we do so.
2043 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link);
2044 orphan->node->flags &= ~DEVFS_ORPHANED;
2045 devfs_freep(orphan->node);
2046 kfree(orphan, M_DEVFS);
2054 * Fetch an ino_t from the global d_ino by increasing it
2058 devfs_fetch_ino(void)
2062 spin_lock_wr(&ino_lock);
2064 spin_unlock_wr(&ino_lock);
2070 * Allocates a new cdev and initializes it's most basic
2074 devfs_new_cdev(struct dev_ops *ops, int minor, struct dev_ops *bops)
2076 cdev_t dev = sysref_alloc(&cdev_sysref_class);
2078 sysref_activate(&dev->si_sysref);
2080 bzero(dev, offsetof(struct cdev, si_sysref));
2085 dev->si_drv1 = NULL;
2086 dev->si_drv2 = NULL;
2087 dev->si_lastread = 0; /* time_second */
2088 dev->si_lastwrite = 0; /* time_second */
2093 dev->si_uminor = minor;
2094 dev->si_bops = bops;
2095 /* If there is a backing device, we reference its ops */
2096 dev->si_inode = makeudev(
2097 devfs_reference_ops((bops)?(bops):(ops)),
2104 devfs_cdev_terminate(cdev_t dev)
2108 /* Check if it is locked already. if not, we acquire the devfs lock */
2109 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
2110 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2114 /* Propagate destruction, just in case */
2115 devfs_propagate_dev(dev, 0);
2117 /* If we acquired the lock, we also get rid of it */
2119 lockmgr(&devfs_lock, LK_RELEASE);
2121 /* If there is a backing device, we release the backing device's ops */
2122 devfs_release_ops((dev->si_bops)?(dev->si_bops):(dev->si_ops));
2124 /* Finally destroy the device */
2125 sysref_put(&dev->si_sysref);
2129 * Links a given cdev into the dev list.
2132 devfs_link_dev(cdev_t dev)
2134 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
2135 dev->si_flags |= SI_DEVFS_LINKED;
2136 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link);
2142 * Removes a given cdev from the dev list. The caller is responsible for
2143 * releasing the reference on the device associated with the linkage.
2145 * Returns EALREADY if the dev has already been unlinked.
2148 devfs_unlink_dev(cdev_t dev)
2150 if ((dev->si_flags & SI_DEVFS_LINKED)) {
2151 TAILQ_REMOVE(&devfs_dev_list, dev, link);
2152 dev->si_flags &= ~SI_DEVFS_LINKED;
2159 devfs_node_is_accessible(struct devfs_node *node)
2161 if ((node) && (!(node->flags & DEVFS_HIDDEN)))
2168 devfs_reference_ops(struct dev_ops *ops)
2171 struct devfs_dev_ops *found = NULL;
2172 struct devfs_dev_ops *devops;
2174 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2175 if (devops->ops == ops) {
2182 found = kmalloc(sizeof(struct devfs_dev_ops), M_DEVFS, M_WAITOK);
2184 found->ref_count = 0;
2185 TAILQ_INSERT_TAIL(&devfs_dev_ops_list, found, link);
2190 if (found->ref_count == 0) {
2191 found->id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255);
2192 if (found->id == -1) {
2193 /* Ran out of unique ids */
2194 devfs_debug(DEVFS_DEBUG_WARNING,
2195 "devfs_reference_ops: WARNING: ran out of unique ids\n");
2205 devfs_release_ops(struct dev_ops *ops)
2207 struct devfs_dev_ops *found = NULL;
2208 struct devfs_dev_ops *devops;
2210 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2211 if (devops->ops == ops) {
2221 if (found->ref_count == 0) {
2222 TAILQ_REMOVE(&devfs_dev_ops_list, found, link);
2223 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), found->id);
2224 kfree(found, M_DEVFS);
2233 msg = devfs_msg_get();
2234 msg = devfs_msg_send_sync(DEVFS_SYNC, msg);
2239 * Called on init of devfs; creates the objcaches and
2240 * spawns off the devfs core thread. Also initializes
2246 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n");
2247 /* Create objcaches for nodes, msgs and devs */
2248 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0,
2250 objcache_malloc_alloc,
2251 objcache_malloc_free,
2252 &devfs_node_malloc_args );
2254 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0,
2256 objcache_malloc_alloc,
2257 objcache_malloc_free,
2258 &devfs_msg_malloc_args );
2260 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0,
2262 objcache_malloc_alloc,
2263 objcache_malloc_free,
2264 &devfs_dev_malloc_args );
2266 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id));
2268 /* Initialize the reply-only port which acts as a message drain */
2269 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply);
2271 /* Initialize *THE* devfs lock */
2272 lockinit(&devfs_lock, "devfs_core lock", 0, 0);
2275 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL,
2276 0, 0, "devfs_msg_core");
2278 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2280 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n");
2284 * Called on unload of devfs; takes care of destroying the core
2285 * and the objcaches. Also removes aliases that are no longer needed.
2290 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
2292 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL);
2294 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2295 tsleep(td_core/*devfs_id*/, 0, "devfsc", 10000);
2297 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id));
2299 /* Destroy the objcaches */
2300 objcache_destroy(devfs_msg_cache);
2301 objcache_destroy(devfs_node_cache);
2302 objcache_destroy(devfs_dev_cache);
2308 * This is a sysctl handler to assist userland devname(3) to
2309 * find the device name for a given udev.
2312 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS)
2319 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t))))
2322 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev);
2327 if ((found = devfs_find_device_by_udev(udev)) == NULL)
2330 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1));
2334 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
2335 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)");
2337 static SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
2338 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable);
2339 SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable,
2340 0, "Enable DevFS debugging");
2342 SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST,
2344 SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY,
2345 devfs_uninit, NULL);