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 void devfs_cdev_lock(cdev_t dev);
61 static void devfs_cdev_unlock(cdev_t dev);
62 static struct sysref_class cdev_sysref_class = {
65 .proto = SYSREF_PROTO_DEV,
66 .offset = offsetof(struct cdev, si_sysref),
67 .objsize = sizeof(struct cdev),
71 .terminate = (sysref_terminate_func_t)devfs_cdev_terminate,
72 .lock = (sysref_lock_func_t)devfs_cdev_lock,
73 .unlock = (sysref_unlock_func_t)devfs_cdev_unlock
77 static struct objcache *devfs_node_cache;
78 static struct objcache *devfs_msg_cache;
79 static struct objcache *devfs_dev_cache;
81 static struct objcache_malloc_args devfs_node_malloc_args = {
82 sizeof(struct devfs_node), M_DEVFS };
83 struct objcache_malloc_args devfs_msg_malloc_args = {
84 sizeof(struct devfs_msg), M_DEVFS };
85 struct objcache_malloc_args devfs_dev_malloc_args = {
86 sizeof(struct cdev), M_DEVFS };
88 static struct devfs_dev_head devfs_dev_list =
89 TAILQ_HEAD_INITIALIZER(devfs_dev_list);
90 static struct devfs_mnt_head devfs_mnt_list =
91 TAILQ_HEAD_INITIALIZER(devfs_mnt_list);
92 static struct devfs_chandler_head devfs_chandler_list =
93 TAILQ_HEAD_INITIALIZER(devfs_chandler_list);
94 static struct devfs_alias_head devfs_alias_list =
95 TAILQ_HEAD_INITIALIZER(devfs_alias_list);
96 static struct devfs_dev_ops_head devfs_dev_ops_list =
97 TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list);
99 struct lock devfs_lock;
100 static struct lwkt_port devfs_dispose_port;
101 static struct lwkt_port devfs_msg_port;
102 static struct thread *td_core;
104 static struct spinlock ino_lock;
106 static int devfs_debug_enable;
107 static int devfs_run;
109 static ino_t devfs_fetch_ino(void);
110 static int devfs_create_all_dev_worker(struct devfs_node *);
111 static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int);
112 static int devfs_destroy_dev_worker(cdev_t);
113 static int devfs_destroy_subnames_worker(char *);
114 static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int);
115 static int devfs_propagate_dev(cdev_t, int);
116 static int devfs_unlink_dev(cdev_t dev);
117 static void devfs_msg_exec(devfs_msg_t msg);
119 static int devfs_chandler_add_worker(const char *, d_clone_t *);
120 static int devfs_chandler_del_worker(const char *);
122 static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
123 static void devfs_msg_core(void *);
125 static int devfs_find_device_by_name_worker(devfs_msg_t);
126 static int devfs_find_device_by_udev_worker(devfs_msg_t);
128 static int devfs_apply_reset_rules_caller(char *, int);
130 static int devfs_scan_callback_worker(devfs_scan_t *);
132 static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *,
133 char *, size_t, int);
135 static int devfs_make_alias_worker(struct devfs_alias *);
136 static int devfs_alias_remove(cdev_t);
137 static int devfs_alias_reap(void);
138 static int devfs_alias_propagate(struct devfs_alias *);
139 static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *);
140 static int devfs_alias_check_create(struct devfs_node *);
142 static int devfs_clr_subnames_flag_worker(char *, uint32_t);
143 static int devfs_destroy_subnames_without_flag_worker(char *, uint32_t);
145 static void *devfs_reaperp_callback(struct devfs_node *, void *);
146 static void *devfs_gc_dirs_callback(struct devfs_node *, void *);
147 static void *devfs_gc_links_callback(struct devfs_node *, struct devfs_node *);
149 devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *);
152 void (*devfs_node_added)(struct hotplug_device*) = NULL;
153 void (*devfs_node_removed)(struct hotplug_device*) = NULL;
156 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function
160 devfs_debug(int level, char *fmt, ...)
165 if (level <= devfs_debug_enable)
173 * devfs_allocp() Allocates a new devfs node with the specified
174 * parameters. The node is also automatically linked into the topology
175 * if a parent is specified. It also calls the rule and alias stuff to
176 * be applied on the new node
179 devfs_allocp(devfs_nodetype devfsnodetype, char *name,
180 struct devfs_node *parent, struct mount *mp, cdev_t dev)
182 struct devfs_node *node = NULL;
183 size_t namlen = strlen(name);
185 node = objcache_get(devfs_node_cache, M_WAITOK);
186 bzero(node, sizeof(*node));
188 atomic_add_long(&(DEVFS_MNTDATA(mp)->leak_count), 1);
193 node->d_dir.d_ino = devfs_fetch_ino();
196 * Cookie jar for children. Leave 0 and 1 for '.' and '..' entries
199 node->cookie_jar = 2;
202 * Access Control members
204 node->mode = DEVFS_DEFAULT_MODE;
205 node->uid = DEVFS_DEFAULT_UID;
206 node->gid = DEVFS_DEFAULT_GID;
208 switch (devfsnodetype) {
211 * Ensure that we don't recycle the root vnode by marking it as
212 * linked into the topology.
214 node->flags |= DEVFS_NODE_LINKED;
216 TAILQ_INIT(DEVFS_DENODE_HEAD(node));
217 node->d_dir.d_type = DT_DIR;
222 node->d_dir.d_type = DT_LNK;
226 node->d_dir.d_type = DT_REG;
231 node->d_dir.d_type = DT_CHR;
234 node->mode = dev->si_perms;
235 node->uid = dev->si_uid;
236 node->gid = dev->si_gid;
238 devfs_alias_check_create(node);
243 panic("devfs_allocp: unknown node type");
247 node->node_type = devfsnodetype;
249 /* Initialize the dirent structure of each devfs vnode */
250 KKASSERT(namlen < 256);
251 node->d_dir.d_namlen = namlen;
252 node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK);
253 memcpy(node->d_dir.d_name, name, namlen);
254 node->d_dir.d_name[namlen] = '\0';
256 /* Initialize the parent node element */
257 node->parent = parent;
260 devfs_rule_check_apply(node, NULL);
262 /* Initialize *time members */
263 nanotime(&node->atime);
264 node->mtime = node->ctime = node->atime;
267 * Associate with parent as last step, clean out namecache
270 if ((parent != NULL) &&
271 ((parent->node_type == Proot) || (parent->node_type == Pdir))) {
273 node->cookie = parent->cookie_jar++;
274 node->flags |= DEVFS_NODE_LINKED;
275 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link);
277 /* This forces negative namecache lookups to clear */
278 ++mp->mnt_namecache_gen;
281 ++DEVFS_MNTDATA(mp)->file_count;
287 * devfs_allocv() allocates a new vnode based on a devfs node.
290 devfs_allocv(struct vnode **vpp, struct devfs_node *node)
298 while ((vp = node->v_node) != NULL) {
299 error = vget(vp, LK_EXCLUSIVE);
300 if (error != ENOENT) {
306 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0)
311 if (node->v_node != NULL) {
320 switch (node->node_type) {
322 vsetflags(vp, VROOT);
338 KKASSERT(node->d_dev);
340 vp->v_uminor = node->d_dev->si_uminor;
343 v_associate_rdev(vp, node->d_dev);
344 vp->v_ops = &node->mp->mnt_vn_spec_ops;
348 panic("devfs_allocv: unknown node type");
356 * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode
357 * based on the newly created devfs node.
360 devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype,
361 char *name, struct devfs_node *parent, cdev_t dev)
363 struct devfs_node *node;
365 node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
368 devfs_allocv(vpp, node);
376 * Destroy the devfs_node. The node must be unlinked from the topology.
378 * This function will also destroy any vnode association with the node
381 * The cdev_t itself remains intact.
384 devfs_freep(struct devfs_node *node)
389 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) ||
390 (node->node_type == Proot));
391 KKASSERT((node->flags & DEVFS_DESTROYED) == 0);
393 atomic_subtract_long(&(DEVFS_MNTDATA(node->mp)->leak_count), 1);
394 if (node->symlink_name) {
395 kfree(node->symlink_name, M_DEVFS);
396 node->symlink_name = NULL;
400 * Remove the node from the orphan list if it is still on it.
402 if (node->flags & DEVFS_ORPHANED)
403 devfs_tracer_del_orphan(node);
406 * Disassociate the vnode from the node. This also prevents the
407 * vnode's reclaim code from double-freeing the node.
409 * The vget is needed to safely modify the vp. It also serves
410 * to cycle the refs and terminate the vnode if it happens to
411 * be inactive, otherwise namecache references may not get cleared.
413 while ((vp = node->v_node) != NULL) {
414 if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0)
419 cache_inval_vp(vp, CINV_DESTROY);
422 if (node->d_dir.d_name) {
423 kfree(node->d_dir.d_name, M_DEVFS);
424 node->d_dir.d_name = NULL;
426 node->flags |= DEVFS_DESTROYED;
428 --DEVFS_MNTDATA(node->mp)->file_count;
430 objcache_put(devfs_node_cache, node);
436 * Unlink the devfs node from the topology and add it to the orphan list.
437 * The node will later be destroyed by freep.
439 * Any vnode association, including the v_rdev and v_data, remains intact
443 devfs_unlinkp(struct devfs_node *node)
445 struct devfs_node *parent;
446 struct hotplug_device *hpdev;
450 * Add the node to the orphan list, so it is referenced somewhere, to
451 * so we don't leak it.
453 devfs_tracer_add_orphan(node);
455 parent = node->parent;
458 * If the parent is known we can unlink the node out of the topology
461 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
463 KKASSERT((parent->nchildren >= 0));
464 node->flags &= ~DEVFS_NODE_LINKED;
466 /* hotplug handler */
467 if(devfs_node_removed) {
468 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK);
469 hpdev->dev = node->d_dev;
471 hpdev->name = node->d_dev->si_name;
472 devfs_node_removed(hpdev);
473 kfree(hpdev, M_TEMP);
480 devfs_iterate_topology(struct devfs_node *node,
481 devfs_iterate_callback_t *callback, void *arg1)
483 struct devfs_node *node1, *node2;
486 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
487 if (node->nchildren > 2) {
488 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node),
490 if ((ret = devfs_iterate_topology(node1, callback, arg1)))
496 ret = callback(node, arg1);
501 * devfs_reaperp() is a recursive function that iterates through all the
502 * topology, unlinking and freeing all devfs nodes.
505 devfs_reaperp_callback(struct devfs_node *node, void *unused)
514 devfs_gc_dirs_callback(struct devfs_node *node, void *unused)
516 if (node->node_type == Pdir) {
517 if (node->nchildren == 2) {
527 devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target)
529 if ((node->node_type == Plink) && (node->link_target == target)) {
538 * devfs_gc() is devfs garbage collector. It takes care of unlinking and
539 * freeing a node, but also removes empty directories and links that link
540 * via devfs auto-link mechanism to the node being deleted.
543 devfs_gc(struct devfs_node *node)
545 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
547 if (node->nlinks > 0)
548 devfs_iterate_topology(root_node,
549 (devfs_iterate_callback_t *)devfs_gc_links_callback, node);
552 devfs_iterate_topology(root_node,
553 (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL);
561 * devfs_create_dev() is the asynchronous entry point for device creation.
562 * It just sends a message with the relevant details to the devfs core.
564 * This function will reference the passed device. The reference is owned
565 * by devfs and represents all of the device's node associations.
568 devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
571 devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
577 * devfs_destroy_dev() is the asynchronous entry point for device destruction.
578 * It just sends a message with the relevant details to the devfs core.
581 devfs_destroy_dev(cdev_t dev)
583 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
588 * devfs_mount_add() is the synchronous entry point for adding a new devfs
589 * mount. It sends a synchronous message with the relevant details to the
593 devfs_mount_add(struct devfs_mnt_data *mnt)
597 msg = devfs_msg_get();
599 msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg);
606 * devfs_mount_del() is the synchronous entry point for removing a devfs mount.
607 * It sends a synchronous message with the relevant details to the devfs core.
610 devfs_mount_del(struct devfs_mnt_data *mnt)
614 msg = devfs_msg_get();
616 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
623 * devfs_destroy_subnames() is the synchronous entry point for device
624 * destruction by subname. It just sends a message with the relevant details to
628 devfs_destroy_subnames(char *name)
632 msg = devfs_msg_get();
633 msg->mdv_load = name;
634 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES, msg);
640 devfs_clr_subnames_flag(char *name, uint32_t flag)
644 msg = devfs_msg_get();
645 msg->mdv_flags.name = name;
646 msg->mdv_flags.flag = flag;
647 msg = devfs_msg_send_sync(DEVFS_CLR_SUBNAMES_FLAG, msg);
654 devfs_destroy_subnames_without_flag(char *name, uint32_t flag)
658 msg = devfs_msg_get();
659 msg->mdv_flags.name = name;
660 msg->mdv_flags.flag = flag;
661 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES_WO_FLAG, msg);
668 * devfs_create_all_dev is the asynchronous entry point to trigger device
669 * node creation. It just sends a message with the relevant details to
673 devfs_create_all_dev(struct devfs_node *root)
675 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
680 * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all
681 * devices with a specific set of dev_ops and minor. It just sends a
682 * message with the relevant details to the devfs core.
685 devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor)
687 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor);
692 * devfs_clone_handler_add is the synchronous entry point to add a new
693 * clone handler. It just sends a message with the relevant details to
697 devfs_clone_handler_add(const char *name, d_clone_t *nhandler)
701 msg = devfs_msg_get();
702 msg->mdv_chandler.name = name;
703 msg->mdv_chandler.nhandler = nhandler;
704 msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg);
710 * devfs_clone_handler_del is the synchronous entry point to remove a
711 * clone handler. It just sends a message with the relevant details to
715 devfs_clone_handler_del(const char *name)
719 msg = devfs_msg_get();
720 msg->mdv_chandler.name = name;
721 msg->mdv_chandler.nhandler = NULL;
722 msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg);
728 * devfs_find_device_by_name is the synchronous entry point to find a
729 * device given its name. It sends a synchronous message with the
730 * relevant details to the devfs core and returns the answer.
733 devfs_find_device_by_name(const char *fmt, ...)
744 kvasnrprintf(&target, PATH_MAX, 10, fmt, ap);
747 msg = devfs_msg_get();
748 msg->mdv_name = target;
749 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
750 found = msg->mdv_cdev;
758 * devfs_find_device_by_udev is the synchronous entry point to find a
759 * device given its udev number. It sends a synchronous message with
760 * the relevant details to the devfs core and returns the answer.
763 devfs_find_device_by_udev(udev_t udev)
768 msg = devfs_msg_get();
769 msg->mdv_udev = udev;
770 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
771 found = msg->mdv_cdev;
774 devfs_debug(DEVFS_DEBUG_DEBUG,
775 "devfs_find_device_by_udev found? %s -end:3-\n",
776 ((found) ? found->si_name:"NO"));
781 devfs_inode_to_vnode(struct mount *mp, ino_t target)
783 struct vnode *vp = NULL;
789 msg = devfs_msg_get();
790 msg->mdv_ino.mp = mp;
791 msg->mdv_ino.ino = target;
792 msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg);
793 vp = msg->mdv_ino.vp;
794 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
801 * devfs_make_alias is the asynchronous entry point to register an alias
802 * for a device. It just sends a message with the relevant details to the
806 devfs_make_alias(const char *name, cdev_t dev_target)
808 struct devfs_alias *alias;
813 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
814 alias->name = kstrdup(name, M_DEVFS);
816 alias->dev_target = dev_target;
818 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
823 * devfs_apply_rules is the asynchronous entry point to trigger application
824 * of all rules. It just sends a message with the relevant details to the
828 devfs_apply_rules(char *mntto)
832 new_name = kstrdup(mntto, M_DEVFS);
833 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
839 * devfs_reset_rules is the asynchronous entry point to trigger reset of all
840 * rules. It just sends a message with the relevant details to the devfs core.
843 devfs_reset_rules(char *mntto)
847 new_name = kstrdup(mntto, M_DEVFS);
848 devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
855 * devfs_scan_callback is the asynchronous entry point to call a callback
857 * It just sends a message with the relevant details to the devfs core.
860 devfs_scan_callback(devfs_scan_t *callback)
864 KKASSERT(sizeof(callback) == sizeof(void *));
866 msg = devfs_msg_get();
867 msg->mdv_load = callback;
868 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
876 * Acts as a message drain. Any message that is replied to here gets destroyed
877 * and the memory freed.
880 devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
882 devfs_msg_put((devfs_msg_t)msg);
886 * devfs_msg_get allocates a new devfs msg and returns it.
891 return objcache_get(devfs_msg_cache, M_WAITOK);
895 * devfs_msg_put deallocates a given devfs msg.
898 devfs_msg_put(devfs_msg_t msg)
900 objcache_put(devfs_msg_cache, msg);
905 * devfs_msg_send is the generic asynchronous message sending facility
906 * for devfs. By default the reply port is the automatic disposal port.
908 * If the current thread is the devfs_msg_port thread we execute the
909 * operation synchronously.
912 devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
914 lwkt_port_t port = &devfs_msg_port;
916 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
918 devfs_msg->hdr.u.ms_result = cmd;
920 if (port->mpu_td == curthread) {
921 devfs_msg_exec(devfs_msg);
922 lwkt_replymsg(&devfs_msg->hdr, 0);
924 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
929 * devfs_msg_send_sync is the generic synchronous message sending
930 * facility for devfs. It initializes a local reply port and waits
931 * for the core's answer. This answer is then returned.
934 devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg)
936 struct lwkt_port rep_port;
937 devfs_msg_t msg_incoming;
938 lwkt_port_t port = &devfs_msg_port;
940 lwkt_initport_thread(&rep_port, curthread);
941 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
943 devfs_msg->hdr.u.ms_result = cmd;
945 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
946 msg_incoming = lwkt_waitport(&rep_port, 0);
952 * sends a message with a generic argument.
955 devfs_msg_send_generic(uint32_t cmd, void *load)
957 devfs_msg_t devfs_msg = devfs_msg_get();
959 devfs_msg->mdv_load = load;
960 devfs_msg_send(cmd, devfs_msg);
964 * sends a message with a name argument.
967 devfs_msg_send_name(uint32_t cmd, char *name)
969 devfs_msg_t devfs_msg = devfs_msg_get();
971 devfs_msg->mdv_name = name;
972 devfs_msg_send(cmd, devfs_msg);
976 * sends a message with a mount argument.
979 devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt)
981 devfs_msg_t devfs_msg = devfs_msg_get();
983 devfs_msg->mdv_mnt = mnt;
984 devfs_msg_send(cmd, devfs_msg);
988 * sends a message with an ops argument.
991 devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor)
993 devfs_msg_t devfs_msg = devfs_msg_get();
995 devfs_msg->mdv_ops.ops = ops;
996 devfs_msg->mdv_ops.minor = minor;
997 devfs_msg_send(cmd, devfs_msg);
1001 * sends a message with a clone handler argument.
1004 devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler)
1006 devfs_msg_t devfs_msg = devfs_msg_get();
1008 devfs_msg->mdv_chandler.name = name;
1009 devfs_msg->mdv_chandler.nhandler = handler;
1010 devfs_msg_send(cmd, devfs_msg);
1014 * sends a message with a device argument.
1017 devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms)
1019 devfs_msg_t devfs_msg = devfs_msg_get();
1021 devfs_msg->mdv_dev.dev = dev;
1022 devfs_msg->mdv_dev.uid = uid;
1023 devfs_msg->mdv_dev.gid = gid;
1024 devfs_msg->mdv_dev.perms = perms;
1026 devfs_msg_send(cmd, devfs_msg);
1030 * sends a message with a link argument.
1033 devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp)
1035 devfs_msg_t devfs_msg = devfs_msg_get();
1037 devfs_msg->mdv_link.name = name;
1038 devfs_msg->mdv_link.target = target;
1039 devfs_msg->mdv_link.mp = mp;
1040 devfs_msg_send(cmd, devfs_msg);
1044 * devfs_msg_core is the main devfs thread. It handles all incoming messages
1045 * and calls the relevant worker functions. By using messages it's assured
1046 * that events occur in the correct order.
1049 devfs_msg_core(void *arg)
1054 lwkt_initport_thread(&devfs_msg_port, curthread);
1058 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0);
1059 devfs_debug(DEVFS_DEBUG_DEBUG,
1060 "devfs_msg_core, new msg: %x\n",
1061 (unsigned int)msg->hdr.u.ms_result);
1062 devfs_msg_exec(msg);
1063 lwkt_replymsg(&msg->hdr, 0);
1070 devfs_msg_exec(devfs_msg_t msg)
1072 struct devfs_mnt_data *mnt;
1073 struct devfs_node *node;
1077 * Acquire the devfs lock to ensure safety of all called functions
1079 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1081 switch (msg->hdr.u.ms_result) {
1082 case DEVFS_DEVICE_CREATE:
1083 dev = msg->mdv_dev.dev;
1084 devfs_create_dev_worker(dev,
1087 msg->mdv_dev.perms);
1089 case DEVFS_DEVICE_DESTROY:
1090 dev = msg->mdv_dev.dev;
1091 devfs_destroy_dev_worker(dev);
1093 case DEVFS_DESTROY_SUBNAMES:
1094 devfs_destroy_subnames_worker(msg->mdv_load);
1096 case DEVFS_DESTROY_DEV_BY_OPS:
1097 devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops,
1098 msg->mdv_ops.minor);
1100 case DEVFS_CREATE_ALL_DEV:
1101 node = (struct devfs_node *)msg->mdv_load;
1102 devfs_create_all_dev_worker(node);
1104 case DEVFS_MOUNT_ADD:
1106 TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link);
1107 devfs_create_all_dev_worker(mnt->root_node);
1109 case DEVFS_MOUNT_DEL:
1111 TAILQ_REMOVE(&devfs_mnt_list, mnt, link);
1112 devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback,
1114 if (mnt->leak_count) {
1115 devfs_debug(DEVFS_DEBUG_SHOW,
1116 "Leaked %ld devfs_node elements!\n",
1120 case DEVFS_CHANDLER_ADD:
1121 devfs_chandler_add_worker(msg->mdv_chandler.name,
1122 msg->mdv_chandler.nhandler);
1124 case DEVFS_CHANDLER_DEL:
1125 devfs_chandler_del_worker(msg->mdv_chandler.name);
1127 case DEVFS_FIND_DEVICE_BY_NAME:
1128 devfs_find_device_by_name_worker(msg);
1130 case DEVFS_FIND_DEVICE_BY_UDEV:
1131 devfs_find_device_by_udev_worker(msg);
1133 case DEVFS_MAKE_ALIAS:
1134 devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load);
1136 case DEVFS_APPLY_RULES:
1137 devfs_apply_reset_rules_caller(msg->mdv_name, 1);
1139 case DEVFS_RESET_RULES:
1140 devfs_apply_reset_rules_caller(msg->mdv_name, 0);
1142 case DEVFS_SCAN_CALLBACK:
1143 devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load);
1145 case DEVFS_CLR_SUBNAMES_FLAG:
1146 devfs_clr_subnames_flag_worker(msg->mdv_flags.name,
1147 msg->mdv_flags.flag);
1149 case DEVFS_DESTROY_SUBNAMES_WO_FLAG:
1150 devfs_destroy_subnames_without_flag_worker(msg->mdv_flags.name,
1151 msg->mdv_flags.flag);
1153 case DEVFS_INODE_TO_VNODE:
1154 msg->mdv_ino.vp = devfs_iterate_topology(
1155 DEVFS_MNTDATA(msg->mdv_ino.mp)->root_node,
1156 (devfs_iterate_callback_t *)devfs_inode_to_vnode_worker_callback,
1159 case DEVFS_TERMINATE_CORE:
1165 devfs_debug(DEVFS_DEBUG_WARNING,
1166 "devfs_msg_core: unknown message "
1167 "received at core\n");
1170 lockmgr(&devfs_lock, LK_RELEASE);
1174 * Worker function to insert a new dev into the dev list and initialize its
1175 * permissions. It also calls devfs_propagate_dev which in turn propagates
1176 * the change to all mount points.
1178 * The passed dev is already referenced. This reference is eaten by this
1179 * function and represents the dev's linkage into devfs_dev_list.
1182 devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms)
1188 dev->si_perms = perms;
1190 devfs_link_dev(dev);
1191 devfs_propagate_dev(dev, 1);
1197 * Worker function to delete a dev from the dev list and free the cdev.
1198 * It also calls devfs_propagate_dev which in turn propagates the change
1199 * to all mount points.
1202 devfs_destroy_dev_worker(cdev_t dev)
1207 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1209 error = devfs_unlink_dev(dev);
1210 devfs_propagate_dev(dev, 0);
1212 release_dev(dev); /* link ref */
1220 * Worker function to destroy all devices with a certain basename.
1221 * Calls devfs_destroy_dev_worker for the actual destruction.
1224 devfs_destroy_subnames_worker(char *name)
1227 size_t len = strlen(name);
1229 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1230 if ((!strncmp(dev->si_name, name, len)) &&
1231 (dev->si_name[len] != '\0')) {
1232 devfs_destroy_dev_worker(dev);
1239 devfs_clr_subnames_flag_worker(char *name, uint32_t flag)
1242 size_t len = strlen(name);
1244 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1245 if ((!strncmp(dev->si_name, name, len)) &&
1246 (dev->si_name[len] != '\0')) {
1247 dev->si_flags &= ~flag;
1255 devfs_destroy_subnames_without_flag_worker(char *name, uint32_t flag)
1258 size_t len = strlen(name);
1260 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1261 if ((!strncmp(dev->si_name, name, len)) &&
1262 (dev->si_name[len] != '\0')) {
1263 if (!(dev->si_flags & flag)) {
1264 devfs_destroy_dev_worker(dev);
1273 * Worker function that creates all device nodes on top of a devfs
1277 devfs_create_all_dev_worker(struct devfs_node *root)
1283 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1284 devfs_create_device_node(root, dev, NULL, NULL);
1291 * Worker function that destroys all devices that match a specific
1292 * dev_ops and/or minor. If minor is less than 0, it is not matched
1293 * against. It also propagates all changes.
1296 devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor)
1302 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1303 if (dev->si_ops != ops)
1305 if ((minor < 0) || (dev->si_uminor == minor)) {
1306 devfs_destroy_dev_worker(dev);
1314 * Worker function that registers a new clone handler in devfs.
1317 devfs_chandler_add_worker(const char *name, d_clone_t *nhandler)
1319 struct devfs_clone_handler *chandler = NULL;
1320 u_char len = strlen(name);
1325 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1326 if (chandler->namlen != len)
1329 if (!memcmp(chandler->name, name, len)) {
1330 /* Clonable basename already exists */
1335 chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO);
1336 chandler->name = kstrdup(name, M_DEVFS);
1337 chandler->namlen = len;
1338 chandler->nhandler = nhandler;
1340 TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link);
1345 * Worker function that removes a given clone handler from the
1346 * clone handler list.
1349 devfs_chandler_del_worker(const char *name)
1351 struct devfs_clone_handler *chandler, *chandler2;
1352 u_char len = strlen(name);
1357 TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) {
1358 if (chandler->namlen != len)
1360 if (memcmp(chandler->name, name, len))
1363 TAILQ_REMOVE(&devfs_chandler_list, chandler, link);
1364 kfree(chandler->name, M_DEVFS);
1365 kfree(chandler, M_DEVFS);
1373 * Worker function that finds a given device name and changes
1374 * the message received accordingly so that when replied to,
1375 * the answer is returned to the caller.
1378 devfs_find_device_by_name_worker(devfs_msg_t devfs_msg)
1380 struct devfs_alias *alias;
1382 cdev_t found = NULL;
1384 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1385 if (strcmp(devfs_msg->mdv_name, dev->si_name) == 0) {
1390 if (found == NULL) {
1391 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1392 if (strcmp(devfs_msg->mdv_name, alias->name) == 0) {
1393 found = alias->dev_target;
1398 devfs_msg->mdv_cdev = found;
1404 * Worker function that finds a given device udev and changes
1405 * the message received accordingly so that when replied to,
1406 * the answer is returned to the caller.
1409 devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg)
1412 cdev_t found = NULL;
1414 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1415 if (((udev_t)dev->si_inode) == devfs_msg->mdv_udev) {
1420 devfs_msg->mdv_cdev = found;
1426 * Worker function that inserts a given alias into the
1427 * alias list, and propagates the alias to all mount
1431 devfs_make_alias_worker(struct devfs_alias *alias)
1433 struct devfs_alias *alias2;
1434 size_t len = strlen(alias->name);
1437 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1438 if (len != alias2->namlen)
1441 if (!memcmp(alias->name, alias2->name, len)) {
1449 * The alias doesn't exist yet, so we add it to the alias list
1451 TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link);
1452 devfs_alias_propagate(alias);
1454 devfs_debug(DEVFS_DEBUG_WARNING,
1455 "Warning: duplicate devfs_make_alias for %s\n",
1457 kfree(alias->name, M_DEVFS);
1458 kfree(alias, M_DEVFS);
1465 * Function that removes and frees all aliases.
1468 devfs_alias_reap(void)
1470 struct devfs_alias *alias, *alias2;
1472 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1473 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1474 kfree(alias, M_DEVFS);
1480 * Function that removes an alias matching a specific cdev and frees
1484 devfs_alias_remove(cdev_t dev)
1486 struct devfs_alias *alias, *alias2;
1488 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1489 if (alias->dev_target == dev) {
1490 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1491 kfree(alias, M_DEVFS);
1498 * This function propagates a new alias to all mount points.
1501 devfs_alias_propagate(struct devfs_alias *alias)
1503 struct devfs_mnt_data *mnt;
1505 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1506 devfs_alias_apply(mnt->root_node, alias);
1512 * This function is a recursive function iterating through
1513 * all device nodes in the topology and, if applicable,
1514 * creating the relevant alias for a device node.
1517 devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias)
1519 struct devfs_node *node1, *node2;
1521 KKASSERT(alias != NULL);
1523 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
1524 if (node->nchildren > 2) {
1525 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
1526 devfs_alias_apply(node1, alias);
1530 if (node->d_dev == alias->dev_target)
1531 devfs_alias_create(alias->name, node, 0);
1537 * This function checks if any alias possibly is applicable
1538 * to the given node. If so, the alias is created.
1541 devfs_alias_check_create(struct devfs_node *node)
1543 struct devfs_alias *alias;
1545 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1546 if (node->d_dev == alias->dev_target)
1547 devfs_alias_create(alias->name, node, 0);
1553 * This function creates an alias with a given name
1554 * linking to a given devfs node. It also increments
1555 * the link count on the target node.
1558 devfs_alias_create(char *name_orig, struct devfs_node *target, int rule_based)
1560 struct mount *mp = target->mp;
1561 struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node;
1562 struct devfs_node *linknode;
1563 struct hotplug_device *hpdev;
1564 char *create_path = NULL;
1569 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1571 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1572 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name);
1575 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1578 if (devfs_find_device_node_by_name(parent, name)) {
1579 devfs_debug(DEVFS_DEBUG_WARNING,
1580 "Node already exists: %s "
1581 "(devfs_make_alias_worker)!\n",
1587 linknode = devfs_allocp(Plink, name, parent, mp, NULL);
1588 if (linknode == NULL) {
1593 linknode->link_target = target;
1597 linknode->flags |= DEVFS_RULE_CREATED;
1600 /* hotplug handler */
1601 if(devfs_node_added) {
1602 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK);
1603 hpdev->dev = target->d_dev;
1604 hpdev->name = name_orig;
1605 devfs_node_added(hpdev);
1606 kfree(hpdev, M_TEMP);
1608 kfree(name_buf, M_TEMP);
1613 * This function is called by the core and handles mount point
1614 * strings. It either calls the relevant worker (devfs_apply_
1615 * reset_rules_worker) on all mountpoints or only a specific
1619 devfs_apply_reset_rules_caller(char *mountto, int apply)
1621 struct devfs_mnt_data *mnt;
1623 if (mountto[0] == '*') {
1624 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1625 devfs_iterate_topology(mnt->root_node,
1626 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1630 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1631 if (!strcmp(mnt->mp->mnt_stat.f_mntonname, mountto)) {
1632 devfs_iterate_topology(mnt->root_node,
1633 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1640 kfree(mountto, M_DEVFS);
1645 * This function calls a given callback function for
1646 * every dev node in the devfs dev list.
1649 devfs_scan_callback_worker(devfs_scan_t *callback)
1653 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1661 * This function tries to resolve a given directory, or if not
1662 * found and creation requested, creates the given directory.
1664 static struct devfs_node *
1665 devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name,
1666 size_t name_len, int create)
1668 struct devfs_node *node, *found = NULL;
1670 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1671 if (name_len != node->d_dir.d_namlen)
1674 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) {
1680 if ((found == NULL) && (create)) {
1681 found = devfs_allocp(Pdir, dir_name, parent, parent->mp, NULL);
1688 * This function tries to resolve a complete path. If creation is requested,
1689 * if a given part of the path cannot be resolved (because it doesn't exist),
1693 devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create)
1695 struct devfs_node *node = parent;
1702 buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1704 while (*path && idx < PATH_MAX - 1) {
1709 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1719 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1720 kfree (buf, M_TEMP);
1725 * Takes a full path and strips it into a directory path and a name.
1726 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It
1727 * requires a working buffer with enough size to keep the whole
1731 devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep)
1735 size_t len = strlen(fullpath) + 1;
1738 KKASSERT((fullpath != NULL) && (buf != NULL));
1739 KKASSERT((pathp != NULL) && (namep != NULL));
1741 memcpy(buf, fullpath, len);
1743 for (i = len-1; i>= 0; i--) {
1744 if (buf[i] == '/') {
1764 * This function creates a new devfs node for a given device. It can
1765 * handle a complete path as device name, and accordingly creates
1766 * the path and the final device node.
1768 * The reference count on the passed dev remains unchanged.
1771 devfs_create_device_node(struct devfs_node *root, cdev_t dev,
1772 char *dev_name, char *path_fmt, ...)
1774 struct devfs_node *parent, *node = NULL;
1775 struct hotplug_device *hpdev;
1781 char *create_path = NULL;
1782 char *names = "pqrsPQRS";
1784 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1786 if (path_fmt != NULL) {
1787 __va_start(ap, path_fmt);
1788 kvasnrprintf(&path, PATH_MAX, 10, path_fmt, ap);
1792 parent = devfs_resolve_or_create_path(root, path, 1);
1795 devfs_resolve_name_path(
1796 ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name),
1797 name_buf, &create_path, &name);
1800 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1803 if (devfs_find_device_node_by_name(parent, name)) {
1804 devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: "
1805 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name);
1809 node = devfs_allocp(Pdev, name, parent, parent->mp, dev);
1810 nanotime(&parent->mtime);
1813 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their
1816 if ((dev) && (strlen(dev->si_name) >= 4) &&
1817 (!memcmp(dev->si_name, "ptm/", 4))) {
1818 node->parent->flags |= DEVFS_HIDDEN;
1819 node->flags |= DEVFS_HIDDEN;
1823 * Ugly pty magic, to tag pty devices as such and hide them if needed.
1825 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3)))
1826 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1828 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) {
1830 for (i = 0; i < strlen(names); i++) {
1831 if (name[3] == names[i]) {
1837 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1839 /* hotplug handler */
1840 if(devfs_node_added) {
1841 hpdev = kmalloc(sizeof(struct hotplug_device), M_TEMP, M_WAITOK);
1842 hpdev->dev = node->d_dev;
1843 hpdev->name = node->d_dev->si_name;
1844 devfs_node_added(hpdev);
1845 kfree(hpdev, M_TEMP);
1849 kfree(name_buf, M_TEMP);
1855 * This function finds a given device node in the topology with a given
1859 devfs_find_device_node_callback(struct devfs_node *node, cdev_t target)
1861 if ((node->node_type == Pdev) && (node->d_dev == target)) {
1869 * This function finds a device node in the given parent directory by its
1870 * name and returns it.
1873 devfs_find_device_node_by_name(struct devfs_node *parent, char *target)
1875 struct devfs_node *node, *found = NULL;
1876 size_t len = strlen(target);
1878 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1879 if (len != node->d_dir.d_namlen)
1882 if (!memcmp(node->d_dir.d_name, target, len)) {
1892 devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop)
1894 struct vnode *vp = NULL;
1895 ino_t target = *inop;
1897 if (node->d_dir.d_ino == target) {
1900 vget(vp, LK_EXCLUSIVE | LK_RETRY);
1903 devfs_allocv(&vp, node);
1912 * This function takes a cdev and removes its devfs node in the
1913 * given topology. The cdev remains intact.
1916 devfs_destroy_device_node(struct devfs_node *root, cdev_t target)
1918 struct devfs_node *node, *parent;
1921 char *create_path = NULL;
1925 name_buf = kmalloc(PATH_MAX, M_TEMP, M_WAITOK);
1926 ksnprintf(name_buf, PATH_MAX, "%s", target->si_name);
1928 devfs_resolve_name_path(target->si_name, name_buf, &create_path, &name);
1931 parent = devfs_resolve_or_create_path(root, create_path, 0);
1935 if (parent == NULL) {
1936 kfree(name_buf, M_TEMP);
1940 node = devfs_find_device_node_by_name(parent, name);
1943 nanotime(&node->parent->mtime);
1947 kfree(name_buf, M_TEMP);
1953 * Just set perms and ownership for given node.
1956 devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid,
1957 u_short mode, u_long flags)
1967 * Propagates a device attach/detach to all mount
1968 * points. Also takes care of automatic alias removal
1969 * for a deleted cdev.
1972 devfs_propagate_dev(cdev_t dev, int attach)
1974 struct devfs_mnt_data *mnt;
1976 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1978 /* Device is being attached */
1979 devfs_create_device_node(mnt->root_node, dev,
1982 /* Device is being detached */
1983 devfs_alias_remove(dev);
1984 devfs_destroy_device_node(mnt->root_node, dev);
1991 * devfs_clone either returns a basename from a complete name by
1992 * returning the length of the name without trailing digits, or,
1993 * if clone != 0, calls the device's clone handler to get a new
1994 * device, which in turn is returned in devp.
1997 devfs_clone(cdev_t dev, const char *name, size_t len, int mode,
2001 struct devfs_clone_handler *chandler;
2002 struct dev_clone_args ap;
2004 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
2005 if (chandler->namlen != len)
2007 if ((!memcmp(chandler->name, name, len)) && (chandler->nhandler)) {
2008 lockmgr(&devfs_lock, LK_RELEASE);
2010 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2012 ap.a_head.a_dev = dev;
2018 error = (chandler->nhandler)(&ap);
2031 * Registers a new orphan in the orphan list.
2034 devfs_tracer_add_orphan(struct devfs_node *node)
2036 struct devfs_orphan *orphan;
2039 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK);
2040 orphan->node = node;
2042 KKASSERT((node->flags & DEVFS_ORPHANED) == 0);
2043 node->flags |= DEVFS_ORPHANED;
2044 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link);
2048 * Removes an orphan from the orphan list.
2051 devfs_tracer_del_orphan(struct devfs_node *node)
2053 struct devfs_orphan *orphan;
2057 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) {
2058 if (orphan->node == node) {
2059 node->flags &= ~DEVFS_ORPHANED;
2060 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link);
2061 kfree(orphan, M_DEVFS);
2068 * Counts the orphans in the orphan list, and if cleanup
2069 * is specified, also frees the orphan and removes it from
2073 devfs_tracer_orphan_count(struct mount *mp, int cleanup)
2075 struct devfs_orphan *orphan, *orphan2;
2078 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) {
2081 * If we are instructed to clean up, we do so.
2084 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link);
2085 orphan->node->flags &= ~DEVFS_ORPHANED;
2086 devfs_freep(orphan->node);
2087 kfree(orphan, M_DEVFS);
2095 * Fetch an ino_t from the global d_ino by increasing it
2099 devfs_fetch_ino(void)
2103 spin_lock_wr(&ino_lock);
2105 spin_unlock_wr(&ino_lock);
2111 * Allocates a new cdev and initializes it's most basic
2115 devfs_new_cdev(struct dev_ops *ops, int minor, struct dev_ops *bops)
2117 cdev_t dev = sysref_alloc(&cdev_sysref_class);
2119 sysref_activate(&dev->si_sysref);
2121 bzero(dev, offsetof(struct cdev, si_sysref));
2126 dev->si_drv1 = NULL;
2127 dev->si_drv2 = NULL;
2128 dev->si_lastread = 0; /* time_second */
2129 dev->si_lastwrite = 0; /* time_second */
2134 dev->si_uminor = minor;
2135 dev->si_bops = bops;
2136 /* If there is a backing device, we reference its ops */
2137 dev->si_inode = makeudev(
2138 devfs_reference_ops((bops)?(bops):(ops)),
2145 devfs_cdev_terminate(cdev_t dev)
2149 /* Check if it is locked already. if not, we acquire the devfs lock */
2150 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
2151 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2155 /* Propagate destruction, just in case */
2156 devfs_propagate_dev(dev, 0);
2158 /* If we acquired the lock, we also get rid of it */
2160 lockmgr(&devfs_lock, LK_RELEASE);
2162 /* If there is a backing device, we release the backing device's ops */
2163 devfs_release_ops((dev->si_bops)?(dev->si_bops):(dev->si_ops));
2165 /* Finally destroy the device */
2166 sysref_put(&dev->si_sysref);
2170 * Dummies for now (individual locks for MPSAFE)
2173 devfs_cdev_lock(cdev_t dev)
2178 devfs_cdev_unlock(cdev_t dev)
2183 * Links a given cdev into the dev list.
2186 devfs_link_dev(cdev_t dev)
2188 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
2189 dev->si_flags |= SI_DEVFS_LINKED;
2190 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link);
2196 * Removes a given cdev from the dev list. The caller is responsible for
2197 * releasing the reference on the device associated with the linkage.
2199 * Returns EALREADY if the dev has already been unlinked.
2202 devfs_unlink_dev(cdev_t dev)
2204 if ((dev->si_flags & SI_DEVFS_LINKED)) {
2205 TAILQ_REMOVE(&devfs_dev_list, dev, link);
2206 dev->si_flags &= ~SI_DEVFS_LINKED;
2213 devfs_node_is_accessible(struct devfs_node *node)
2215 if ((node) && (!(node->flags & DEVFS_HIDDEN)))
2222 devfs_reference_ops(struct dev_ops *ops)
2225 struct devfs_dev_ops *found = NULL;
2226 struct devfs_dev_ops *devops;
2228 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2229 if (devops->ops == ops) {
2236 found = kmalloc(sizeof(struct devfs_dev_ops), M_DEVFS, M_WAITOK);
2238 found->ref_count = 0;
2239 TAILQ_INSERT_TAIL(&devfs_dev_ops_list, found, link);
2244 if (found->ref_count == 0) {
2245 found->id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255);
2246 if (found->id == -1) {
2247 /* Ran out of unique ids */
2248 devfs_debug(DEVFS_DEBUG_WARNING,
2249 "devfs_reference_ops: WARNING: ran out of unique ids\n");
2259 devfs_release_ops(struct dev_ops *ops)
2261 struct devfs_dev_ops *found = NULL;
2262 struct devfs_dev_ops *devops;
2264 TAILQ_FOREACH(devops, &devfs_dev_ops_list, link) {
2265 if (devops->ops == ops) {
2275 if (found->ref_count == 0) {
2276 TAILQ_REMOVE(&devfs_dev_ops_list, found, link);
2277 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), found->id);
2278 kfree(found, M_DEVFS);
2287 msg = devfs_msg_get();
2288 msg = devfs_msg_send_sync(DEVFS_SYNC, msg);
2293 * Called on init of devfs; creates the objcaches and
2294 * spawns off the devfs core thread. Also initializes
2300 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n");
2301 /* Create objcaches for nodes, msgs and devs */
2302 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0,
2304 objcache_malloc_alloc,
2305 objcache_malloc_free,
2306 &devfs_node_malloc_args );
2308 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0,
2310 objcache_malloc_alloc,
2311 objcache_malloc_free,
2312 &devfs_msg_malloc_args );
2314 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0,
2316 objcache_malloc_alloc,
2317 objcache_malloc_free,
2318 &devfs_dev_malloc_args );
2320 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id));
2322 /* Initialize the reply-only port which acts as a message drain */
2323 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply);
2325 /* Initialize *THE* devfs lock */
2326 lockinit(&devfs_lock, "devfs_core lock", 0, 0);
2329 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL,
2330 0, 0, "devfs_msg_core");
2332 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2334 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n");
2338 * Called on unload of devfs; takes care of destroying the core
2339 * and the objcaches. Also removes aliases that are no longer needed.
2344 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
2346 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL);
2348 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2349 tsleep(td_core/*devfs_id*/, 0, "devfsc", 10000);
2351 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id));
2353 /* Destroy the objcaches */
2354 objcache_destroy(devfs_msg_cache);
2355 objcache_destroy(devfs_node_cache);
2356 objcache_destroy(devfs_dev_cache);
2362 * This is a sysctl handler to assist userland devname(3) to
2363 * find the device name for a given udev.
2366 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS)
2373 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t))))
2376 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev);
2381 if ((found = devfs_find_device_by_udev(udev)) == NULL)
2384 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1));
2388 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
2389 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)");
2391 SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
2392 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable);
2393 SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable,
2394 0, "Enable DevFS debugging");
2396 SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST,
2398 SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY,
2399 devfs_uninit, NULL);