2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/mount.h>
38 #include <sys/vnode.h>
39 #include <sys/types.h>
41 #include <sys/msgport.h>
42 #include <sys/msgport2.h>
43 #include <sys/spinlock2.h>
44 #include <sys/sysctl.h>
45 #include <sys/ucred.h>
46 #include <sys/param.h>
47 #include <sys/sysref2.h>
48 #include <sys/systm.h>
49 #include <vfs/devfs/devfs.h>
50 #include <vfs/devfs/devfs_rules.h>
52 MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations");
53 DEVFS_DECLARE_CLONE_BITMAP(ops_id);
55 * SYSREF Integration - reference counting, allocation,
56 * sysid and syslink integration.
58 static void devfs_cdev_terminate(cdev_t dev);
59 static struct sysref_class cdev_sysref_class = {
62 .proto = SYSREF_PROTO_DEV,
63 .offset = offsetof(struct cdev, si_sysref),
64 .objsize = sizeof(struct cdev),
68 .terminate = (sysref_terminate_func_t)devfs_cdev_terminate
72 static struct objcache *devfs_node_cache;
73 static struct objcache *devfs_msg_cache;
74 static struct objcache *devfs_dev_cache;
76 static struct objcache_malloc_args devfs_node_malloc_args = {
77 sizeof(struct devfs_node), M_DEVFS };
78 struct objcache_malloc_args devfs_msg_malloc_args = {
79 sizeof(struct devfs_msg), M_DEVFS };
80 struct objcache_malloc_args devfs_dev_malloc_args = {
81 sizeof(struct cdev), M_DEVFS };
83 static struct devfs_dev_head devfs_dev_list =
84 TAILQ_HEAD_INITIALIZER(devfs_dev_list);
85 static struct devfs_mnt_head devfs_mnt_list =
86 TAILQ_HEAD_INITIALIZER(devfs_mnt_list);
87 static struct devfs_chandler_head devfs_chandler_list =
88 TAILQ_HEAD_INITIALIZER(devfs_chandler_list);
89 static struct devfs_alias_head devfs_alias_list =
90 TAILQ_HEAD_INITIALIZER(devfs_alias_list);
92 struct lock devfs_lock;
93 static struct lwkt_port devfs_dispose_port;
94 static struct lwkt_port devfs_msg_port;
95 static struct thread *td_core;
97 static struct spinlock ino_lock;
99 static int devfs_debug_enable;
100 static int devfs_run;
102 static ino_t devfs_fetch_ino(void);
103 static int devfs_create_all_dev_worker(struct devfs_node *);
104 static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int);
105 static int devfs_destroy_dev_worker(cdev_t);
106 static int devfs_destroy_subnames_worker(char *);
107 static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int);
108 static int devfs_propagate_dev(cdev_t, int);
109 static int devfs_unlink_dev(cdev_t dev);
110 static void devfs_msg_exec(devfs_msg_t msg);
112 static int devfs_chandler_add_worker(char *, d_clone_t *);
113 static int devfs_chandler_del_worker(char *);
115 static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
116 static void devfs_msg_core(void *);
118 static int devfs_find_device_by_name_worker(devfs_msg_t);
119 static int devfs_find_device_by_udev_worker(devfs_msg_t);
121 static int devfs_apply_reset_rules_caller(char *, int);
123 static int devfs_scan_callback_worker(devfs_scan_t *);
125 static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *,
126 char *, size_t, int);
128 static int devfs_make_alias_worker(struct devfs_alias *);
129 static int devfs_alias_remove(cdev_t);
130 static int devfs_alias_reap(void);
131 static int devfs_alias_propagate(struct devfs_alias *);
132 static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *);
133 static int devfs_alias_check_create(struct devfs_node *);
135 static int devfs_clr_subnames_flag_worker(char *, uint32_t);
136 static int devfs_destroy_subnames_without_flag_worker(char *, uint32_t);
138 static void *devfs_reaperp_callback(struct devfs_node *, void *);
139 static void *devfs_gc_dirs_callback(struct devfs_node *, void *);
140 static void *devfs_gc_links_callback(struct devfs_node *, struct devfs_node *);
142 devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *);
145 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function
149 devfs_debug(int level, char *fmt, ...)
154 if (level <= devfs_debug_enable)
162 * devfs_allocp() Allocates a new devfs node with the specified
163 * parameters. The node is also automatically linked into the topology
164 * if a parent is specified. It also calls the rule and alias stuff to
165 * be applied on the new node
168 devfs_allocp(devfs_nodetype devfsnodetype, char *name,
169 struct devfs_node *parent, struct mount *mp, cdev_t dev)
171 struct devfs_node *node = NULL;
172 size_t namlen = strlen(name);
174 node = objcache_get(devfs_node_cache, M_WAITOK);
175 bzero(node, sizeof(*node));
177 atomic_add_int(&(DEVFS_MNTDATA(mp)->leak_count), 1);
182 node->d_dir.d_ino = devfs_fetch_ino();
185 * Cookie jar for children. Leave 0 and 1 for '.' and '..' entries
188 node->cookie_jar = 2;
191 * Access Control members
193 node->mode = DEVFS_DEFAULT_MODE;
194 node->uid = DEVFS_DEFAULT_UID;
195 node->gid = DEVFS_DEFAULT_GID;
197 switch (devfsnodetype) {
200 * Ensure that we don't recycle the root vnode by marking it as
201 * linked into the topology.
203 node->flags |= DEVFS_NODE_LINKED;
205 TAILQ_INIT(DEVFS_DENODE_HEAD(node));
206 node->d_dir.d_type = DT_DIR;
211 node->d_dir.d_type = DT_LNK;
215 node->d_dir.d_type = DT_REG;
220 node->d_dir.d_type = DT_CHR;
223 node->mode = dev->si_perms;
224 node->uid = dev->si_uid;
225 node->gid = dev->si_gid;
227 devfs_alias_check_create(node);
232 panic("devfs_allocp: unknown node type");
236 node->node_type = devfsnodetype;
238 /* Initialize the dirent structure of each devfs vnode */
239 KKASSERT(namlen < 256);
240 node->d_dir.d_namlen = namlen;
241 node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK);
242 memcpy(node->d_dir.d_name, name, namlen);
243 node->d_dir.d_name[namlen] = '\0';
245 /* Initialize the parent node element */
246 node->parent = parent;
249 devfs_rule_check_apply(node, NULL);
251 /* Initialize *time members */
252 nanotime(&node->atime);
253 node->mtime = node->ctime = node->atime;
256 * Associate with parent as last step, clean out namecache
259 if ((parent != NULL) &&
260 ((parent->node_type == Proot) || (parent->node_type == Pdir))) {
262 node->cookie = parent->cookie_jar++;
263 node->flags |= DEVFS_NODE_LINKED;
264 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link);
266 /* This forces negative namecache lookups to clear */
267 ++mp->mnt_namecache_gen;
274 * devfs_allocv() allocates a new vnode based on a devfs node.
277 devfs_allocv(struct vnode **vpp, struct devfs_node *node)
285 while ((vp = node->v_node) != NULL) {
286 error = vget(vp, LK_EXCLUSIVE);
287 if (error != ENOENT) {
293 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0)
298 if (node->v_node != NULL) {
307 switch (node->node_type) {
324 KKASSERT(node->d_dev);
326 vp->v_uminor = node->d_dev->si_uminor;
329 v_associate_rdev(vp, node->d_dev);
330 vp->v_ops = &node->mp->mnt_vn_spec_ops;
334 panic("devfs_allocv: unknown node type");
342 * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode
343 * based on the newly created devfs node.
346 devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype,
347 char *name, struct devfs_node *parent, cdev_t dev)
349 struct devfs_node *node;
351 node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
354 devfs_allocv(vpp, node);
362 * Destroy the devfs_node. The node must be unlinked from the topology.
364 * This function will also destroy any vnode association with the node
367 * The cdev_t itself remains intact.
370 devfs_freep(struct devfs_node *node)
375 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) ||
376 (node->node_type == Proot));
377 KKASSERT((node->flags & DEVFS_DESTROYED) == 0);
379 atomic_subtract_int(&(DEVFS_MNTDATA(node->mp)->leak_count), 1);
380 if (node->symlink_name) {
381 kfree(node->symlink_name, M_DEVFS);
382 node->symlink_name = NULL;
386 * Remove the node from the orphan list if it is still on it.
388 if (node->flags & DEVFS_ORPHANED)
389 devfs_tracer_del_orphan(node);
392 * Disassociate the vnode from the node. This also prevents the
393 * vnode's reclaim code from double-freeing the node.
395 * The vget is needed to safely modify the vp. It also serves
396 * to cycle the refs and terminate the vnode if it happens to
397 * be inactive, otherwise namecache references may not get cleared.
399 while ((vp = node->v_node) != NULL) {
400 if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0)
407 if (node->d_dir.d_name)
408 kfree(node->d_dir.d_name, M_DEVFS);
409 node->flags |= DEVFS_DESTROYED;
411 objcache_put(devfs_node_cache, node);
417 * Unlink the devfs node from the topology and add it to the orphan list.
418 * The node will later be destroyed by freep.
420 * Any vnode association, including the v_rdev and v_data, remains intact
424 devfs_unlinkp(struct devfs_node *node)
426 struct devfs_node *parent;
430 * Add the node to the orphan list, so it is referenced somewhere, to
431 * so we don't leak it.
433 devfs_tracer_add_orphan(node);
435 parent = node->parent;
438 * If the parent is known we can unlink the node out of the topology
441 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
443 KKASSERT((parent->nchildren >= 0));
444 node->flags &= ~DEVFS_NODE_LINKED;
451 devfs_iterate_topology(struct devfs_node *node,
452 devfs_iterate_callback_t *callback, void *arg1)
454 struct devfs_node *node1, *node2;
457 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
458 if (node->nchildren > 2) {
459 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node),
461 if ((ret = devfs_iterate_topology(node1, callback, arg1)))
467 ret = callback(node, arg1);
472 * devfs_reaperp() is a recursive function that iterates through all the
473 * topology, unlinking and freeing all devfs nodes.
476 devfs_reaperp_callback(struct devfs_node *node, void *unused)
485 devfs_gc_dirs_callback(struct devfs_node *node, void *unused)
487 if (node->node_type == Pdir) {
488 if (node->nchildren == 2) {
498 devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target)
500 if ((node->node_type == Plink) && (node->link_target == target)) {
509 * devfs_gc() is devfs garbage collector. It takes care of unlinking and
510 * freeing a node, but also removes empty directories and links that link
511 * via devfs auto-link mechanism to the node being deleted.
514 devfs_gc(struct devfs_node *node)
516 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
518 if (node->nlinks > 0)
519 devfs_iterate_topology(root_node,
520 (devfs_iterate_callback_t *)devfs_gc_links_callback, node);
523 devfs_iterate_topology(root_node,
524 (devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL);
532 * devfs_create_dev() is the asynchronous entry point for device creation.
533 * It just sends a message with the relevant details to the devfs core.
535 * This function will reference the passed device. The reference is owned
536 * by devfs and represents all of the device's node associations.
539 devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
542 devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
548 * devfs_destroy_dev() is the asynchronous entry point for device destruction.
549 * It just sends a message with the relevant details to the devfs core.
552 devfs_destroy_dev(cdev_t dev)
554 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
559 * devfs_mount_add() is the synchronous entry point for adding a new devfs
560 * mount. It sends a synchronous message with the relevant details to the
564 devfs_mount_add(struct devfs_mnt_data *mnt)
568 msg = devfs_msg_get();
570 msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg);
577 * devfs_mount_del() is the synchronous entry point for removing a devfs mount.
578 * It sends a synchronous message with the relevant details to the devfs core.
581 devfs_mount_del(struct devfs_mnt_data *mnt)
585 msg = devfs_msg_get();
587 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
594 * devfs_destroy_subnames() is the synchronous entry point for device
595 * destruction by subname. It just sends a message with the relevant details to
599 devfs_destroy_subnames(char *name)
603 msg = devfs_msg_get();
604 msg->mdv_load = name;
605 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES, msg);
611 devfs_clr_subnames_flag(char *name, uint32_t flag)
615 msg = devfs_msg_get();
616 msg->mdv_flags.name = name;
617 msg->mdv_flags.flag = flag;
618 msg = devfs_msg_send_sync(DEVFS_CLR_SUBNAMES_FLAG, msg);
625 devfs_destroy_subnames_without_flag(char *name, uint32_t flag)
629 msg = devfs_msg_get();
630 msg->mdv_flags.name = name;
631 msg->mdv_flags.flag = flag;
632 msg = devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES_WO_FLAG, msg);
639 * devfs_create_all_dev is the asynchronous entry point to trigger device
640 * node creation. It just sends a message with the relevant details to
644 devfs_create_all_dev(struct devfs_node *root)
646 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
651 * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all
652 * devices with a specific set of dev_ops and minor. It just sends a
653 * message with the relevant details to the devfs core.
656 devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor)
658 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor);
663 * devfs_clone_handler_add is the synchronous entry point to add a new
664 * clone handler. It just sends a message with the relevant details to
668 devfs_clone_handler_add(char *name, d_clone_t *nhandler)
672 msg = devfs_msg_get();
673 msg->mdv_chandler.name = name;
674 msg->mdv_chandler.nhandler = nhandler;
675 msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg);
681 * devfs_clone_handler_del is the synchronous entry point to remove a
682 * clone handler. It just sends a message with the relevant details to
686 devfs_clone_handler_del(char *name)
690 msg = devfs_msg_get();
691 msg->mdv_chandler.name = name;
692 msg->mdv_chandler.nhandler = NULL;
693 msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg);
699 * devfs_find_device_by_name is the synchronous entry point to find a
700 * device given its name. It sends a synchronous message with the
701 * relevant details to the devfs core and returns the answer.
704 devfs_find_device_by_name(const char *fmt, ...)
708 char target[PATH_MAX+1];
716 i = kvcprintf(fmt, NULL, target, 10, ap);
720 msg = devfs_msg_get();
721 msg->mdv_name = target;
722 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
723 found = msg->mdv_cdev;
730 * devfs_find_device_by_udev is the synchronous entry point to find a
731 * device given its udev number. It sends a synchronous message with
732 * the relevant details to the devfs core and returns the answer.
735 devfs_find_device_by_udev(udev_t udev)
740 msg = devfs_msg_get();
741 msg->mdv_udev = udev;
742 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
743 found = msg->mdv_cdev;
746 devfs_debug(DEVFS_DEBUG_DEBUG,
747 "devfs_find_device_by_udev found? %s -end:3-\n",
748 ((found) ? found->si_name:"NO"));
753 devfs_inode_to_vnode(struct mount *mp, ino_t target)
755 struct vnode *vp = NULL;
761 msg = devfs_msg_get();
762 msg->mdv_ino.mp = mp;
763 msg->mdv_ino.ino = target;
764 msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg);
765 vp = msg->mdv_ino.vp;
766 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
773 * devfs_make_alias is the asynchronous entry point to register an alias
774 * for a device. It just sends a message with the relevant details to the
778 devfs_make_alias(char *name, cdev_t dev_target)
780 struct devfs_alias *alias;
785 alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
786 alias->name = kmalloc(len + 1, M_DEVFS, M_WAITOK);
787 memcpy(alias->name, name, len + 1);
789 alias->dev_target = dev_target;
791 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
796 * devfs_apply_rules is the asynchronous entry point to trigger application
797 * of all rules. It just sends a message with the relevant details to the
801 devfs_apply_rules(char *mntto)
806 namelen = strlen(mntto) + 1;
807 new_name = kmalloc(namelen, M_DEVFS, M_WAITOK);
808 memcpy(new_name, mntto, namelen);
809 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
815 * devfs_reset_rules is the asynchronous entry point to trigger reset of all
816 * rules. It just sends a message with the relevant details to the devfs core.
819 devfs_reset_rules(char *mntto)
824 namelen = strlen(mntto) + 1;
825 new_name = kmalloc(namelen, M_DEVFS, M_WAITOK);
826 memcpy(new_name, mntto, namelen);
827 devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
834 * devfs_scan_callback is the asynchronous entry point to call a callback
836 * It just sends a message with the relevant details to the devfs core.
839 devfs_scan_callback(devfs_scan_t *callback)
843 KKASSERT(sizeof(callback) == sizeof(void *));
845 msg = devfs_msg_get();
846 msg->mdv_load = callback;
847 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
855 * Acts as a message drain. Any message that is replied to here gets destroyed
856 * and the memory freed.
859 devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
861 devfs_msg_put((devfs_msg_t)msg);
865 * devfs_msg_get allocates a new devfs msg and returns it.
870 return objcache_get(devfs_msg_cache, M_WAITOK);
874 * devfs_msg_put deallocates a given devfs msg.
877 devfs_msg_put(devfs_msg_t msg)
879 objcache_put(devfs_msg_cache, msg);
884 * devfs_msg_send is the generic asynchronous message sending facility
885 * for devfs. By default the reply port is the automatic disposal port.
887 * If the current thread is the devfs_msg_port thread we execute the
888 * operation synchronously.
891 devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
893 lwkt_port_t port = &devfs_msg_port;
895 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
897 devfs_msg->hdr.u.ms_result = cmd;
899 if (port->mpu_td == curthread) {
900 devfs_msg_exec(devfs_msg);
901 lwkt_replymsg(&devfs_msg->hdr, 0);
903 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
908 * devfs_msg_send_sync is the generic synchronous message sending
909 * facility for devfs. It initializes a local reply port and waits
910 * for the core's answer. This answer is then returned.
913 devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg)
915 struct lwkt_port rep_port;
916 devfs_msg_t msg_incoming;
917 lwkt_port_t port = &devfs_msg_port;
919 lwkt_initport_thread(&rep_port, curthread);
920 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
922 devfs_msg->hdr.u.ms_result = cmd;
924 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
925 msg_incoming = lwkt_waitport(&rep_port, 0);
931 * sends a message with a generic argument.
934 devfs_msg_send_generic(uint32_t cmd, void *load)
936 devfs_msg_t devfs_msg = devfs_msg_get();
938 devfs_msg->mdv_load = load;
939 devfs_msg_send(cmd, devfs_msg);
943 * sends a message with a name argument.
946 devfs_msg_send_name(uint32_t cmd, char *name)
948 devfs_msg_t devfs_msg = devfs_msg_get();
950 devfs_msg->mdv_name = name;
951 devfs_msg_send(cmd, devfs_msg);
955 * sends a message with a mount argument.
958 devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt)
960 devfs_msg_t devfs_msg = devfs_msg_get();
962 devfs_msg->mdv_mnt = mnt;
963 devfs_msg_send(cmd, devfs_msg);
967 * sends a message with an ops argument.
970 devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor)
972 devfs_msg_t devfs_msg = devfs_msg_get();
974 devfs_msg->mdv_ops.ops = ops;
975 devfs_msg->mdv_ops.minor = minor;
976 devfs_msg_send(cmd, devfs_msg);
980 * sends a message with a clone handler argument.
983 devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler)
985 devfs_msg_t devfs_msg = devfs_msg_get();
987 devfs_msg->mdv_chandler.name = name;
988 devfs_msg->mdv_chandler.nhandler = handler;
989 devfs_msg_send(cmd, devfs_msg);
993 * sends a message with a device argument.
996 devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms)
998 devfs_msg_t devfs_msg = devfs_msg_get();
1000 devfs_msg->mdv_dev.dev = dev;
1001 devfs_msg->mdv_dev.uid = uid;
1002 devfs_msg->mdv_dev.gid = gid;
1003 devfs_msg->mdv_dev.perms = perms;
1005 devfs_msg_send(cmd, devfs_msg);
1009 * sends a message with a link argument.
1012 devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp)
1014 devfs_msg_t devfs_msg = devfs_msg_get();
1016 devfs_msg->mdv_link.name = name;
1017 devfs_msg->mdv_link.target = target;
1018 devfs_msg->mdv_link.mp = mp;
1019 devfs_msg_send(cmd, devfs_msg);
1023 * devfs_msg_core is the main devfs thread. It handles all incoming messages
1024 * and calls the relevant worker functions. By using messages it's assured
1025 * that events occur in the correct order.
1028 devfs_msg_core(void *arg)
1033 lwkt_initport_thread(&devfs_msg_port, curthread);
1037 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0);
1038 devfs_debug(DEVFS_DEBUG_DEBUG,
1039 "devfs_msg_core, new msg: %x\n",
1040 (unsigned int)msg->hdr.u.ms_result);
1041 devfs_msg_exec(msg);
1042 lwkt_replymsg(&msg->hdr, 0);
1049 devfs_msg_exec(devfs_msg_t msg)
1051 struct devfs_mnt_data *mnt;
1052 struct devfs_node *node;
1056 * Acquire the devfs lock to ensure safety of all called functions
1058 lockmgr(&devfs_lock, LK_EXCLUSIVE);
1060 switch (msg->hdr.u.ms_result) {
1061 case DEVFS_DEVICE_CREATE:
1062 dev = msg->mdv_dev.dev;
1063 devfs_create_dev_worker(dev,
1066 msg->mdv_dev.perms);
1068 case DEVFS_DEVICE_DESTROY:
1069 dev = msg->mdv_dev.dev;
1070 devfs_destroy_dev_worker(dev);
1072 case DEVFS_DESTROY_SUBNAMES:
1073 devfs_destroy_subnames_worker(msg->mdv_load);
1075 case DEVFS_DESTROY_DEV_BY_OPS:
1076 devfs_destroy_dev_by_ops_worker(msg->mdv_ops.ops,
1077 msg->mdv_ops.minor);
1079 case DEVFS_CREATE_ALL_DEV:
1080 node = (struct devfs_node *)msg->mdv_load;
1081 devfs_create_all_dev_worker(node);
1083 case DEVFS_MOUNT_ADD:
1085 TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link);
1086 devfs_create_all_dev_worker(mnt->root_node);
1088 case DEVFS_MOUNT_DEL:
1090 TAILQ_REMOVE(&devfs_mnt_list, mnt, link);
1091 devfs_iterate_topology(mnt->root_node, devfs_reaperp_callback,
1093 if (mnt->leak_count) {
1094 devfs_debug(DEVFS_DEBUG_SHOW,
1095 "Leaked %d devfs_node elements!\n",
1099 case DEVFS_CHANDLER_ADD:
1100 devfs_chandler_add_worker(msg->mdv_chandler.name,
1101 msg->mdv_chandler.nhandler);
1103 case DEVFS_CHANDLER_DEL:
1104 devfs_chandler_del_worker(msg->mdv_chandler.name);
1106 case DEVFS_FIND_DEVICE_BY_NAME:
1107 devfs_find_device_by_name_worker(msg);
1109 case DEVFS_FIND_DEVICE_BY_UDEV:
1110 devfs_find_device_by_udev_worker(msg);
1112 case DEVFS_MAKE_ALIAS:
1113 devfs_make_alias_worker((struct devfs_alias *)msg->mdv_load);
1115 case DEVFS_APPLY_RULES:
1116 devfs_apply_reset_rules_caller(msg->mdv_name, 1);
1118 case DEVFS_RESET_RULES:
1119 devfs_apply_reset_rules_caller(msg->mdv_name, 0);
1121 case DEVFS_SCAN_CALLBACK:
1122 devfs_scan_callback_worker((devfs_scan_t *)msg->mdv_load);
1124 case DEVFS_CLR_SUBNAMES_FLAG:
1125 devfs_clr_subnames_flag_worker(msg->mdv_flags.name,
1126 msg->mdv_flags.flag);
1128 case DEVFS_DESTROY_SUBNAMES_WO_FLAG:
1129 devfs_destroy_subnames_without_flag_worker(msg->mdv_flags.name,
1130 msg->mdv_flags.flag);
1132 case DEVFS_INODE_TO_VNODE:
1133 msg->mdv_ino.vp = devfs_iterate_topology(
1134 DEVFS_MNTDATA(msg->mdv_ino.mp)->root_node,
1135 (devfs_iterate_callback_t *)devfs_inode_to_vnode_worker_callback,
1138 case DEVFS_TERMINATE_CORE:
1144 devfs_debug(DEVFS_DEBUG_WARNING,
1145 "devfs_msg_core: unknown message "
1146 "received at core\n");
1149 lockmgr(&devfs_lock, LK_RELEASE);
1153 * Worker function to insert a new dev into the dev list and initialize its
1154 * permissions. It also calls devfs_propagate_dev which in turn propagates
1155 * the change to all mount points.
1157 * The passed dev is already referenced. This reference is eaten by this
1158 * function and represents the dev's linkage into devfs_dev_list.
1161 devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms)
1167 dev->si_perms = perms;
1169 devfs_link_dev(dev);
1170 devfs_propagate_dev(dev, 1);
1176 * Worker function to delete a dev from the dev list and free the cdev.
1177 * It also calls devfs_propagate_dev which in turn propagates the change
1178 * to all mount points.
1181 devfs_destroy_dev_worker(cdev_t dev)
1186 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1188 error = devfs_unlink_dev(dev);
1189 devfs_propagate_dev(dev, 0);
1191 release_dev(dev); /* link ref */
1199 * Worker function to destroy all devices with a certain basename.
1200 * Calls devfs_destroy_dev_worker for the actual destruction.
1203 devfs_destroy_subnames_worker(char *name)
1206 size_t len = strlen(name);
1208 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1209 if ((!strncmp(dev->si_name, name, len)) &&
1210 (dev->si_name[len] != '\0')) {
1211 devfs_destroy_dev_worker(dev);
1218 devfs_clr_subnames_flag_worker(char *name, uint32_t flag)
1221 size_t len = strlen(name);
1223 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1224 if ((!strncmp(dev->si_name, name, len)) &&
1225 (dev->si_name[len] != '\0')) {
1226 dev->si_flags &= ~flag;
1234 devfs_destroy_subnames_without_flag_worker(char *name, uint32_t flag)
1237 size_t len = strlen(name);
1239 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1240 if ((!strncmp(dev->si_name, name, len)) &&
1241 (dev->si_name[len] != '\0')) {
1242 if (!(dev->si_flags & flag)) {
1243 devfs_destroy_dev_worker(dev);
1252 * Worker function that creates all device nodes on top of a devfs
1256 devfs_create_all_dev_worker(struct devfs_node *root)
1262 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1263 devfs_create_device_node(root, dev, NULL, NULL);
1270 * Worker function that destroys all devices that match a specific
1271 * dev_ops and/or minor. If minor is less than 0, it is not matched
1272 * against. It also propagates all changes.
1275 devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor)
1281 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1282 if (dev->si_ops != ops)
1284 if ((minor < 0) || (dev->si_uminor == minor)) {
1285 devfs_destroy_dev_worker(dev);
1293 * Worker function that registers a new clone handler in devfs.
1296 devfs_chandler_add_worker(char *name, d_clone_t *nhandler)
1298 struct devfs_clone_handler *chandler = NULL;
1299 u_char len = strlen(name);
1304 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1305 if (chandler->namlen != len)
1308 if (!memcmp(chandler->name, name, len)) {
1309 /* Clonable basename already exists */
1314 chandler = kmalloc(sizeof(*chandler), M_DEVFS, M_WAITOK | M_ZERO);
1315 chandler->name = kmalloc(len+1, M_DEVFS, M_WAITOK);
1316 memcpy(chandler->name, name, len+1);
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(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;
1544 char *name, name_buf[PATH_MAX];
1546 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1548 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name);
1551 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1554 if (devfs_find_device_node_by_name(parent, name)) {
1555 devfs_debug(DEVFS_DEBUG_WARNING,
1556 "Node already exists: %s "
1557 "(devfs_make_alias_worker)!\n",
1563 linknode = devfs_allocp(Plink, name, parent, mp, NULL);
1564 if (linknode == NULL)
1567 linknode->link_target = target;
1571 linknode->flags |= DEVFS_RULE_CREATED;
1577 * This function is called by the core and handles mount point
1578 * strings. It either calls the relevant worker (devfs_apply_
1579 * reset_rules_worker) on all mountpoints or only a specific
1583 devfs_apply_reset_rules_caller(char *mountto, int apply)
1585 struct devfs_mnt_data *mnt;
1586 size_t len = strlen(mountto);
1588 if (mountto[0] == '*') {
1589 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1590 devfs_iterate_topology(mnt->root_node,
1591 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1595 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1596 if ((len != mnt->mntonnamelen))
1599 if (!memcmp(mnt->mp->mnt_stat.f_mntonname, mountto, len)) {
1600 devfs_iterate_topology(mnt->root_node,
1601 (apply)?(devfs_rule_check_apply):(devfs_rule_reset_node),
1608 kfree(mountto, M_DEVFS);
1613 * This function calls a given callback function for
1614 * every dev node in the devfs dev list.
1617 devfs_scan_callback_worker(devfs_scan_t *callback)
1621 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1629 * This function tries to resolve a given directory, or if not
1630 * found and creation requested, creates the given directory.
1632 static struct devfs_node *
1633 devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name,
1634 size_t name_len, int create)
1636 struct devfs_node *node, *found = NULL;
1638 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1639 if (name_len != node->d_dir.d_namlen)
1642 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) {
1648 if ((found == NULL) && (create)) {
1649 found = devfs_allocp(Pdir, dir_name, parent, parent->mp, NULL);
1656 * This function tries to resolve a complete path. If creation is requested,
1657 * if a given part of the path cannot be resolved (because it doesn't exist),
1661 devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create)
1663 struct devfs_node *node = parent;
1672 for (; *path != '\0' ; path++) {
1677 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1684 return devfs_resolve_or_create_dir(node, buf, idx, create);
1688 * Takes a full path and strips it into a directory path and a name.
1689 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It
1690 * requires a working buffer with enough size to keep the whole
1694 devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep)
1698 size_t len = strlen(fullpath) + 1;
1701 KKASSERT((fullpath != NULL) && (buf != NULL));
1702 KKASSERT((pathp != NULL) && (namep != NULL));
1704 memcpy(buf, fullpath, len);
1706 for (i = len-1; i>= 0; i--) {
1707 if (buf[i] == '/') {
1727 * This function creates a new devfs node for a given device. It can
1728 * handle a complete path as device name, and accordingly creates
1729 * the path and the final device node.
1731 * The reference count on the passed dev remains unchanged.
1734 devfs_create_device_node(struct devfs_node *root, cdev_t dev,
1735 char *dev_name, char *path_fmt, ...)
1737 struct devfs_node *parent, *node = NULL;
1739 char *name, name_buf[PATH_MAX];
1743 char *create_path = NULL;
1744 char *names = "pqrsPQRS";
1746 if (path_fmt != NULL) {
1747 path = kmalloc(PATH_MAX+1, M_DEVFS, M_WAITOK);
1749 __va_start(ap, path_fmt);
1750 i = kvcprintf(path_fmt, NULL, path, 10, ap);
1755 parent = devfs_resolve_or_create_path(root, path, 1);
1758 devfs_resolve_name_path(
1759 ((dev_name == NULL) && (dev))?(dev->si_name):(dev_name),
1760 name_buf, &create_path, &name);
1763 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1766 if (devfs_find_device_node_by_name(parent, name)) {
1767 devfs_debug(DEVFS_DEBUG_WARNING, "devfs_create_device_node: "
1768 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name);
1772 node = devfs_allocp(Pdev, name, parent, parent->mp, dev);
1776 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their
1779 if ((dev) && (strlen(dev->si_name) >= 4) &&
1780 (!memcmp(dev->si_name, "ptm/", 4))) {
1781 node->parent->flags |= DEVFS_HIDDEN;
1782 node->flags |= DEVFS_HIDDEN;
1787 * Ugly pty magic, to tag pty devices as such and hide them if needed.
1789 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3)))
1790 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1792 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) {
1794 for (i = 0; i < strlen(names); i++) {
1795 if (name[3] == names[i]) {
1801 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1805 if (path_fmt != NULL)
1806 kfree(path, M_DEVFS);
1812 * This function finds a given device node in the topology with a given
1816 devfs_find_device_node_callback(struct devfs_node *node, cdev_t target)
1818 if ((node->node_type == Pdev) && (node->d_dev == target)) {
1826 * This function finds a device node in the given parent directory by its
1827 * name and returns it.
1830 devfs_find_device_node_by_name(struct devfs_node *parent, char *target)
1832 struct devfs_node *node, *found = NULL;
1833 size_t len = strlen(target);
1835 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1836 if (len != node->d_dir.d_namlen)
1839 if (!memcmp(node->d_dir.d_name, target, len)) {
1849 devfs_inode_to_vnode_worker_callback(struct devfs_node *node, ino_t *inop)
1851 struct vnode *vp = NULL;
1852 ino_t target = *inop;
1854 if (node->d_dir.d_ino == target) {
1857 vget(vp, LK_EXCLUSIVE | LK_RETRY);
1860 devfs_allocv(&vp, node);
1869 * This function takes a cdev and removes its devfs node in the
1870 * given topology. The cdev remains intact.
1873 devfs_destroy_device_node(struct devfs_node *root, cdev_t target)
1875 struct devfs_node *node, *parent;
1876 char *name, name_buf[PATH_MAX];
1877 char *create_path = NULL;
1881 memcpy(name_buf, target->si_name, strlen(target->si_name)+1);
1883 devfs_resolve_name_path(target->si_name, name_buf, &create_path, &name);
1886 parent = devfs_resolve_or_create_path(root, create_path, 0);
1893 node = devfs_find_device_node_by_name(parent, name);
1902 * Just set perms and ownership for given node.
1905 devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid,
1906 u_short mode, u_long flags)
1916 * Propagates a device attach/detach to all mount
1917 * points. Also takes care of automatic alias removal
1918 * for a deleted cdev.
1921 devfs_propagate_dev(cdev_t dev, int attach)
1923 struct devfs_mnt_data *mnt;
1925 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1927 /* Device is being attached */
1928 devfs_create_device_node(mnt->root_node, dev,
1931 /* Device is being detached */
1932 devfs_alias_remove(dev);
1933 devfs_destroy_device_node(mnt->root_node, dev);
1940 * devfs_node_to_path takes a node and a buffer of a size of
1941 * at least PATH_MAX, resolves the full path from the root
1942 * node and writes it in a humanly-readable format into the
1944 * If DEVFS_STASH_DEPTH is less than the directory level up
1945 * to the root node, only the last DEVFS_STASH_DEPTH levels
1946 * of the path are resolved.
1949 devfs_node_to_path(struct devfs_node *node, char *buffer)
1951 #define DEVFS_STASH_DEPTH 32
1952 struct devfs_node *node_stash[DEVFS_STASH_DEPTH];
1954 memset(buffer, 0, PATH_MAX);
1956 for (i = 0; (i < DEVFS_STASH_DEPTH) && (node->node_type != Proot); i++) {
1957 node_stash[i] = node;
1958 node = node->parent;
1962 for (offset = 0; i >= 0; i--) {
1963 memcpy(buffer+offset, node_stash[i]->d_dir.d_name,
1964 node_stash[i]->d_dir.d_namlen);
1965 offset += node_stash[i]->d_dir.d_namlen;
1967 *(buffer+offset) = '/';
1971 #undef DEVFS_STASH_DEPTH
1976 * devfs_clone either returns a basename from a complete name by
1977 * returning the length of the name without trailing digits, or,
1978 * if clone != 0, calls the device's clone handler to get a new
1979 * device, which in turn is returned in devp.
1982 devfs_clone(char *name, size_t *namlenp, cdev_t *devp, int clone,
1987 size_t len = *namlenp;
1989 struct devfs_clone_handler *chandler;
1990 struct dev_clone_args ap;
1993 for (; (len > 0) && (DEVFS_ISDIGIT(name[len-1])); len--);
1996 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1997 if ((chandler->namlen == len) &&
1998 (!memcmp(chandler->name, name, len)) &&
1999 (chandler->nhandler)) {
2005 error = (chandler->nhandler)(&ap);
2022 * Registers a new orphan in the orphan list.
2025 devfs_tracer_add_orphan(struct devfs_node *node)
2027 struct devfs_orphan *orphan;
2030 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK);
2031 orphan->node = node;
2033 KKASSERT((node->flags & DEVFS_ORPHANED) == 0);
2034 node->flags |= DEVFS_ORPHANED;
2035 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link);
2039 * Removes an orphan from the orphan list.
2042 devfs_tracer_del_orphan(struct devfs_node *node)
2044 struct devfs_orphan *orphan;
2048 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) {
2049 if (orphan->node == node) {
2050 node->flags &= ~DEVFS_ORPHANED;
2051 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link);
2052 kfree(orphan, M_DEVFS);
2059 * Counts the orphans in the orphan list, and if cleanup
2060 * is specified, also frees the orphan and removes it from
2064 devfs_tracer_orphan_count(struct mount *mp, int cleanup)
2066 struct devfs_orphan *orphan, *orphan2;
2069 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) {
2072 * If we are instructed to clean up, we do so.
2075 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link);
2076 orphan->node->flags &= ~DEVFS_ORPHANED;
2077 devfs_freep(orphan->node);
2078 kfree(orphan, M_DEVFS);
2086 * Fetch an ino_t from the global d_ino by increasing it
2090 devfs_fetch_ino(void)
2094 spin_lock_wr(&ino_lock);
2096 spin_unlock_wr(&ino_lock);
2102 * Allocates a new cdev and initializes it's most basic
2106 devfs_new_cdev(struct dev_ops *ops, int minor)
2108 cdev_t dev = sysref_alloc(&cdev_sysref_class);
2109 sysref_activate(&dev->si_sysref);
2111 memset(dev, 0, offsetof(struct cdev, si_sysref));
2116 dev->si_drv1 = NULL;
2117 dev->si_drv2 = NULL;
2118 dev->si_lastread = 0; /* time_second */
2119 dev->si_lastwrite = 0; /* time_second */
2124 dev->si_uminor = minor;
2125 dev->si_inode = makeudev(devfs_reference_ops(ops), minor);
2131 devfs_cdev_terminate(cdev_t dev)
2135 /* Check if it is locked already. if not, we acquire the devfs lock */
2136 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
2137 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2141 /* Propagate destruction, just in case */
2142 devfs_propagate_dev(dev, 0);
2144 /* If we acquired the lock, we also get rid of it */
2146 lockmgr(&devfs_lock, LK_RELEASE);
2148 devfs_release_ops(dev->si_ops);
2150 /* Finally destroy the device */
2151 sysref_put(&dev->si_sysref);
2155 * Links a given cdev into the dev list.
2158 devfs_link_dev(cdev_t dev)
2160 KKASSERT((dev->si_flags & SI_DEVFS_LINKED) == 0);
2161 dev->si_flags |= SI_DEVFS_LINKED;
2162 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link);
2168 * Removes a given cdev from the dev list. The caller is responsible for
2169 * releasing the reference on the device associated with the linkage.
2171 * Returns EALREADY if the dev has already been unlinked.
2174 devfs_unlink_dev(cdev_t dev)
2176 if ((dev->si_flags & SI_DEVFS_LINKED)) {
2177 TAILQ_REMOVE(&devfs_dev_list, dev, link);
2178 dev->si_flags &= ~SI_DEVFS_LINKED;
2185 devfs_node_is_accessible(struct devfs_node *node)
2187 if ((node) && (!(node->flags & DEVFS_HIDDEN)))
2194 devfs_reference_ops(struct dev_ops *ops)
2198 if (ops->head.refs == 0) {
2199 ops->head.id = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id), 255);
2200 if (ops->head.id == -1) {
2201 /* Ran out of unique ids */
2202 devfs_debug(DEVFS_DEBUG_WARNING,
2203 "devfs_reference_ops: WARNING: ran out of unique ids\n");
2206 unit = ops->head.id;
2213 devfs_release_ops(struct dev_ops *ops)
2217 if (ops->head.refs == 0) {
2218 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id), ops->head.id);
2227 msg = devfs_msg_get();
2228 msg = devfs_msg_send_sync(DEVFS_SYNC, msg);
2233 * Called on init of devfs; creates the objcaches and
2234 * spawns off the devfs core thread. Also initializes
2240 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n");
2241 /* Create objcaches for nodes, msgs and devs */
2242 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0,
2244 objcache_malloc_alloc,
2245 objcache_malloc_free,
2246 &devfs_node_malloc_args );
2248 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0,
2250 objcache_malloc_alloc,
2251 objcache_malloc_free,
2252 &devfs_msg_malloc_args );
2254 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0,
2256 objcache_malloc_alloc,
2257 objcache_malloc_free,
2258 &devfs_dev_malloc_args );
2260 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id));
2262 /* Initialize the reply-only port which acts as a message drain */
2263 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply);
2265 /* Initialize *THE* devfs lock */
2266 lockinit(&devfs_lock, "devfs_core lock", 0, 0);
2269 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL,
2270 0, 0, "devfs_msg_core");
2272 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2274 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n");
2278 * Called on unload of devfs; takes care of destroying the core
2279 * and the objcaches. Also removes aliases that are no longer needed.
2284 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
2286 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL);
2288 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2289 tsleep(td_core/*devfs_id*/, 0, "devfsc", 10000);
2291 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id));
2293 /* Destroy the objcaches */
2294 objcache_destroy(devfs_msg_cache);
2295 objcache_destroy(devfs_node_cache);
2296 objcache_destroy(devfs_dev_cache);
2302 * This is a sysctl handler to assist userland devname(3) to
2303 * find the device name for a given udev.
2306 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS)
2313 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t))))
2316 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev);
2321 if ((found = devfs_find_device_by_udev(udev)) == NULL)
2324 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1));
2328 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
2329 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)");
2331 static SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
2332 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable);
2333 SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable,
2334 0, "Enable DevFS debugging");
2336 SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST,
2338 SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY,
2339 devfs_uninit, NULL);