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 <vfs/devfs/devfs.h>
49 #include <vfs/devfs/devfs_rules.h>
51 MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations");
54 * SYSREF Integration - reference counting, allocation,
55 * sysid and syslink integration.
57 static void devfs_cdev_terminate(cdev_t dev);
58 static struct sysref_class cdev_sysref_class = {
61 .proto = SYSREF_PROTO_DEV,
62 .offset = offsetof(struct cdev, si_sysref),
63 .objsize = sizeof(struct cdev),
67 .terminate = (sysref_terminate_func_t)devfs_cdev_terminate
71 static struct objcache *devfs_node_cache;
72 static struct objcache *devfs_msg_cache;
73 static struct objcache *devfs_dev_cache;
75 static struct objcache_malloc_args devfs_node_malloc_args = {
76 sizeof(struct devfs_node), M_DEVFS };
77 struct objcache_malloc_args devfs_msg_malloc_args = {
78 sizeof(struct devfs_msg), M_DEVFS };
79 struct objcache_malloc_args devfs_dev_malloc_args = {
80 sizeof(struct cdev), M_DEVFS };
82 static struct devfs_dev_head devfs_dev_list = TAILQ_HEAD_INITIALIZER(devfs_dev_list);
83 static struct devfs_mnt_head devfs_mnt_list = TAILQ_HEAD_INITIALIZER(devfs_mnt_list);
84 static struct devfs_chandler_head devfs_chandler_list = TAILQ_HEAD_INITIALIZER(devfs_chandler_list);
85 static struct devfs_alias_head devfs_alias_list = TAILQ_HEAD_INITIALIZER(devfs_alias_list);
87 struct lock devfs_lock;
88 static struct lwkt_port devfs_dispose_port;
89 static struct lwkt_port devfs_msg_port;
90 static struct thread *td_core;
91 //static void *devfs_id = (void *)0xDE33A;
93 static ino_t d_ino = 0;
94 static __uint32_t msg_id = 0;
95 static struct spinlock ino_lock;
96 static int devfs_debug_enable = 0;
98 static ino_t devfs_fetch_ino(void);
99 static int devfs_gc_dirs(struct devfs_node *);
100 static int devfs_gc_links(struct devfs_node *, struct devfs_node *, size_t);
101 static int devfs_create_all_dev_worker(struct devfs_node *);
102 static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int);
103 static int devfs_destroy_dev_worker(cdev_t);
104 static int devfs_destroy_subnames_worker(char *);
105 static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int);
106 static int devfs_propagate_dev(cdev_t, int);
108 static int devfs_chandler_add_worker(char *, d_clone_t *);
109 static int devfs_chandler_del_worker(char *);
111 static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
112 static void devfs_msg_core(void *);
114 static int devfs_find_device_by_name_worker(devfs_msg_t);
115 static int devfs_find_device_by_udev_worker(devfs_msg_t);
117 static int devfs_apply_reset_rules_caller(char *, int);
118 static int devfs_apply_reset_rules_worker(struct devfs_node *, int);
120 static int devfs_scan_callback_worker(devfs_scan_t *);
122 static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *, char *, size_t, int);
124 static int devfs_make_alias_worker(struct devfs_alias *);
125 static int devfs_alias_remove(cdev_t);
126 static int devfs_alias_reap(void);
127 static int devfs_alias_propagate(struct devfs_alias *);
128 static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *);
129 static int devfs_alias_check_create(struct devfs_node *);
132 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function using kvprintf
135 devfs_debug(int level, char *fmt, ...)
140 if (level <= devfs_debug_enable)
148 * devfs_allocp() Allocates a new devfs node with the specified parameters. The node is also automatically linked
149 * into the topology if a parent is specified. It also calls the rule and alias stuff to be applied on the new
153 devfs_allocp(devfs_nodetype devfsnodetype, char *name, struct devfs_node *parent, struct mount *mp, cdev_t dev)
155 struct devfs_node *node = NULL;
156 size_t namlen = strlen(name);
157 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocp -1- for %s\n", name?name:"NULL");
159 node = objcache_get(devfs_node_cache, M_WAITOK);
161 atomic_add_int(&(DEVFS_MNTDATA(mp)->leak_count), 1);
165 node->d_dir.d_ino = devfs_fetch_ino();
167 node->cookie_jar = 2; /* Leave 0 and 1 for '.' and '..', respectively */
169 /* Access Control members */
170 node->mode = DEVFS_DEFAULT_MODE; /* files access mode and type */
171 node->uid = DEVFS_DEFAULT_UID; /* owner user id */
172 node->gid = DEVFS_DEFAULT_GID; /* owner group id */
174 /* Null the symlink */
175 node->symlink_name = NULL;
176 node->symlink_namelen = 0;
177 node->link_target = NULL;
179 /* Null the count of links to this node */
182 switch (devfsnodetype) {
184 node->flags |= DEVFS_NODE_LINKED; //Make sure we don't recycle the root vnode
186 TAILQ_INIT(DEVFS_DENODE_HEAD(node));
187 node->d_dir.d_type = DT_DIR;
192 node->d_dir.d_type = DT_LNK;
196 node->d_dir.d_type = DT_REG;
201 node->d_dir.d_type = DT_CHR;
203 node->d_dir.d_ino = dev->si_inode;
205 node->mode = dev->si_perms; /* files access mode and type */
206 node->uid = dev->si_uid; /* owner user id */
207 node->gid = dev->si_gid; /* owner group id */
209 devfs_alias_check_create(node);
214 panic("devfs_allocp: unknown node type");
218 node->node_type = devfsnodetype;
220 /* Init the dirent structure of each devfs vnode */
221 node->d_dir.d_namlen = namlen;
222 memcpy(node->d_dir.d_name, name, namlen);
223 node->d_dir.d_name[namlen] = '\0';
225 /* Initialize the parent node element */
226 node->parent = parent;
229 devfs_rule_check_apply(node);
231 /* If there is a parent, increment the number of his children and add the new
232 * child to the parent's list of children */
233 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocp: about to insert node\n");
234 if ((parent != NULL) &&
235 ((parent->node_type == Proot) || (parent->node_type == Pdir))) {
236 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link);
237 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocp: node inserted\n");
239 node->cookie = parent->cookie_jar++;
240 node->flags |= DEVFS_NODE_LINKED;
244 nanotime(&node->atime);
245 node->mtime = node->ctime = node->atime;
247 /* Null out open references to this "file" */
250 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocp -end:2-\n");
255 * devfs_allocv() allocates a new vnode based on a devfs node.
258 devfs_allocv(struct vnode **vpp, struct devfs_node *node)
265 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv -1-\n");
268 while ((vp = node->v_node) != NULL) {
269 error = vget(vp, LK_EXCLUSIVE);
270 if (error != ENOENT) {
272 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv, code path 2...\n");
276 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv -3-\n");
278 //XXX: afaik getnewvnode doesn't return anything but 0.
280 if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0)
285 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv -4-\n");
287 if (node->v_node != NULL) {
295 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv -5-\n");
297 switch (node->node_type) {
314 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv -6-\n");
315 KKASSERT(node->d_dev);
318 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv -7-\n");
319 vp->v_uminor = node->d_dev->si_uminor;
321 vp->v_rdev = node->d_dev;
322 vp->v_ops = &node->mp->mnt_vn_spec_ops;
323 //v_associate_rdev(vp, node->d_dev);
324 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv -8-\n");
326 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv: type is Pdev but d_dev is not set!!!!\n");
328 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv -9-\n");
332 panic("devfs_allocv: unknown node type");
336 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv -10-\n");
337 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocv -end:11-\n");
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 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocvp -1-\n");
352 node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
353 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocvp -2-\n");
355 devfs_allocv(vpp, node);
359 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_allocvp -end:3-\n");
365 * devfs_freep frees a devfs node *ONLY* if it is the root node or the node is not linked
366 * into the topology anymore. It also calls the tracer helper to keep track of possible
370 devfs_freep(struct devfs_node *node)
373 KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) || (node->node_type == Proot));
375 atomic_subtract_int(&(DEVFS_MNTDATA(node->mp)->leak_count), 1);
376 if (node->symlink_name) {
377 kfree(node->symlink_name, M_DEVFS);
378 node->symlink_name = NULL;
381 if ((node->flags & DEVFS_NO_TRACE) == 0)
382 devfs_tracer_del_orphan(node);
384 //XXX: Add something to make sure that no vnode is associated with this devfs node
385 objcache_put(devfs_node_cache, node);
391 * devfs_unlinkp unlinks a devfs node out of the topology and adds the node
392 * to the orphan list. It is later removed by freep.
393 * If a vnode is still associated to the devfs node, then the vnode's rdev
397 devfs_unlinkp(struct devfs_node *node)
399 struct devfs_node *parent;
402 devfs_tracer_add_orphan(node);
403 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_unlinkp for %s\n", node->d_dir.d_name);
404 parent = node->parent;
406 /* If the parent is known we can unlink the node out of the topology */
408 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
410 KKASSERT((parent->nchildren >= 0));
411 node->flags &= ~DEVFS_NODE_LINKED;
415 /* Invalidate vnode as a device node */
417 node->v_node->v_rdev = NULL;
423 * devfs_reaperp() is a recursive function that iterates through all the topology,
424 * unlinking and freeing all devfs nodes.
427 devfs_reaperp(struct devfs_node *node)
429 struct devfs_node *node1, *node2;
431 //devfs_debug(DEVFS_DEBUG_DEBUG, "This node is called %s\n", node->d_dir.d_name);
432 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
433 devfs_debug(DEVFS_DEBUG_DEBUG, "This node is Pdir or Proot; has %d children\n", node->nchildren);
434 if (node->nchildren > 2) {
435 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
436 devfs_reaperp(node1);
440 //devfs_debug(DEVFS_DEBUG_DEBUG, "This node is called %s and it is being freed\n", node->d_dir.d_name);
448 * devfs_gc() is devfs garbage collector. It takes care of unlinking and freeing a
449 * node, but also removes empty directories and links that link via devfs auto-link
450 * mechanism to the node being deleted.
453 devfs_gc(struct devfs_node *node)
455 struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
457 devfs_gc_links(root_node, node, node->nlinks);
459 devfs_gc_dirs(root_node);
467 * devfs_gc_dirs() is a helper function for devfs_gc, unlinking and freeing
471 devfs_gc_dirs(struct devfs_node *node)
473 struct devfs_node *node1, *node2;
475 //devfs_debug(DEVFS_DEBUG_DEBUG, "This node is called %s\n", node->d_dir.d_name);
477 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
478 devfs_debug(DEVFS_DEBUG_DEBUG, "This node is Pdir or Proot; has %d children\n", node->nchildren);
479 if (node->nchildren > 2) {
480 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
481 devfs_gc_dirs(node1);
485 if (node->nchildren == 2) {
486 devfs_debug(DEVFS_DEBUG_DEBUG, "This node is called %s and it is empty\n", node->d_dir.d_name);
496 * devfs_gc_links() is a helper function for devfs_gc, unlinking and freeing
497 * eauto-linked nodes linking to the node being deleted.
500 devfs_gc_links(struct devfs_node *node, struct devfs_node *target, size_t nlinks)
502 struct devfs_node *node1, *node2;
505 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
506 devfs_debug(DEVFS_DEBUG_DEBUG, "This node is Pdir or Proot; has %d children\n", node->nchildren);
507 if (node->nchildren > 2) {
508 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
509 nlinks = devfs_gc_links(node1, target, nlinks);
512 } else if (node->link_target == target) {
519 KKASSERT(nlinks >= 0);
525 * devfs_create_dev() is the asynchronous entry point for device creation. It
526 * just sends a message with the relevant details to the devfs core.
529 devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
532 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_dev -1-, name: %s (%p)\n", dev->si_name, dev);
533 id = devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
534 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_dev -end:2- (unique id: %x) / (%p)\n", id, dev);
539 * devfs_destroy_dev() is the asynchronous entry point for device destruction. It
540 * just sends a message with the relevant details to the devfs core.
543 devfs_destroy_dev(cdev_t dev)
545 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
550 * devfs_mount_add() is the synchronous entry point for adding a new devfs mount.
551 * It sends a synchronous message with the relevant details to the devfs core.
554 devfs_mount_add(struct devfs_mnt_data *mnt)
558 msg = devfs_msg_get();
560 msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg);
567 * devfs_mount_del() is the synchronous entry point for removing a devfs mount.
568 * It sends a synchronous message with the relevant details to the devfs core.
571 devfs_mount_del(struct devfs_mnt_data *mnt)
575 msg = devfs_msg_get();
577 msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
584 * devfs_destroy_subnames() is the asynchronous entry point for device destruction
585 * by subname. It just sends a message with the relevant details to the devfs core.
588 devfs_destroy_subnames(char *name)
590 devfs_msg_send_generic(DEVFS_DESTROY_SUBNAMES, name);
595 * devfs_create_all_dev is the asynchronous entry point to trigger device node creation.
596 * It just sends a message with the relevant details to the devfs core.
599 devfs_create_all_dev(struct devfs_node *root)
601 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
606 * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all devices with
607 * a specific set of dev_ops and minor.
608 * It just sends a message with the relevant details to the devfs core.
611 devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor)
613 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor);
618 * devfs_clone_handler_add is the asynchronous entry point to add a new clone handler.
619 * It just sends a message with the relevant details to the devfs core.
622 devfs_clone_handler_add(char *name, d_clone_t *nhandler)
624 devfs_msg_send_chandler(DEVFS_CHANDLER_ADD, name, nhandler);
629 * devfs_clone_handler_del is the asynchronous entry point to remove a clone handler.
630 * It just sends a message with the relevant details to the devfs core.
633 devfs_clone_handler_del(char *name)
635 devfs_msg_send_chandler(DEVFS_CHANDLER_DEL, name, NULL);
640 * devfs_find_device_by_name is the synchronous entry point to find a device given
642 * It sends a synchronous message with the relevant details to the devfs core and
643 * returns the answer.
646 devfs_find_device_by_name(const char *fmt, ...)
650 char target[PATH_MAX+1];
659 i = kvcprintf(fmt, NULL, target, 10, ap);
664 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_find_device_by_name: %s -1-\n", target);
665 msg = devfs_msg_get();
666 msg->m_name = target;
667 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
671 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_find_device_by_name found? %s -end:2-\n", (found)?"YES":"NO");
676 * devfs_find_device_by_udev is the synchronous entry point to find a device given
678 * It sends a synchronous message with the relevant details to the devfs core and
679 * returns the answer.
682 devfs_find_device_by_udev(udev_t udev)
687 msg = devfs_msg_get();
689 msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
693 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_find_device_by_udev found? %s -end:3-\n", (found)?found->si_name:"NO");
698 * devfs_make_alias is the asynchronous entry point to register an alias for a device.
699 * It just sends a message with the relevant details to the devfs core.
702 devfs_make_alias(char *name, cdev_t dev_target)
704 struct devfs_alias *alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
705 memcpy(alias->name, name, strlen(name) + 1);
706 alias->dev_target = dev_target;
708 devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
713 * devfs_apply_rules is the asynchronous entry point to trigger application of all rules.
714 * It just sends a message with the relevant details to the devfs core.
717 devfs_apply_rules(char *mntto)
722 namelen = strlen(mntto) + 1;
724 new_name = kmalloc(namelen, M_DEVFS, M_WAITOK);
726 memcpy(new_name, mntto, namelen);
728 devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
733 * devfs_reset_rules is the asynchronous entry point to trigger reset of all rules.
734 * It just sends a message with the relevant details to the devfs core.
737 devfs_reset_rules(char *mntto)
742 namelen = strlen(mntto) + 1;
744 new_name = kmalloc(namelen, M_DEVFS, M_WAITOK);
746 memcpy(new_name, mntto, namelen);
748 devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
754 * devfs_scan_callback is the asynchronous entry point to call a callback
756 * It just sends a message with the relevant details to the devfs core.
759 devfs_scan_callback(devfs_scan_t *callback)
763 /* Make sure that function pointers have the size of a generic pointer (innecessary) */
764 KKASSERT(sizeof(callback) == sizeof(void *));
766 msg = devfs_msg_get();
767 msg->m_load = callback;
768 msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
776 * Acts as a message drain. Any message that is replied to here gets destroyed and
780 devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
782 devfs_msg_put((devfs_msg_t)msg);
786 * devfs_msg_get allocates a new devfs msg and returns it.
791 return objcache_get(devfs_msg_cache, M_WAITOK);
795 * devfs_msg_put deallocates a given devfs msg.
798 devfs_msg_put(devfs_msg_t msg)
800 objcache_put(devfs_msg_cache, msg);
805 * devfs_msg_send is the generic asynchronous message sending facility
806 * for devfs. By default the reply port is the automatic disposal port.
809 devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
811 lwkt_port_t port = &devfs_msg_port;
813 lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
815 devfs_msg->hdr.u.ms_result = cmd;
816 devfs_msg->id = atomic_fetchadd_int(&msg_id, 1);
818 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
820 return devfs_msg->id;
824 * devfs_msg_send_sync is the generic synchronous message sending
825 * facility for devfs. It initializes a local reply port and waits
826 * for the core's answer. This answer is then returned.
829 devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg)
831 struct lwkt_port rep_port;
832 devfs_msg_t msg_incoming;
833 lwkt_port_t port = &devfs_msg_port;
835 lwkt_initport_thread(&rep_port, curthread);
836 lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
838 devfs_msg->hdr.u.ms_result = cmd;
839 devfs_msg->id = atomic_fetchadd_int(&msg_id, 1);
841 lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
842 msg_incoming = lwkt_waitport(&rep_port, 0);
848 * sends a message with a generic argument.
851 devfs_msg_send_generic(uint32_t cmd, void *load)
853 devfs_msg_t devfs_msg = devfs_msg_get();
854 devfs_msg->m_load = load;
856 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_send_generic -1- (%p)\n", load);
858 return devfs_msg_send(cmd, devfs_msg);
862 * sends a message with a name argument.
865 devfs_msg_send_name(uint32_t cmd, char *name)
867 devfs_msg_t devfs_msg = devfs_msg_get();
868 devfs_msg->m_name = name;
870 return devfs_msg_send(cmd, devfs_msg);
874 * sends a message with a mount argument.
877 devfs_msg_send_mount(uint32_t cmd, struct devfs_mnt_data *mnt)
879 devfs_msg_t devfs_msg = devfs_msg_get();
880 devfs_msg->m_mnt = mnt;
882 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_send_mp -1- (%p)\n", mnt);
884 return devfs_msg_send(cmd, devfs_msg);
888 * sends a message with an ops argument.
891 devfs_msg_send_ops(uint32_t cmd, struct dev_ops *ops, int minor)
893 devfs_msg_t devfs_msg = devfs_msg_get();
894 devfs_msg->m_ops.ops = ops;
895 devfs_msg->m_ops.minor = minor;
897 return devfs_msg_send(cmd, devfs_msg);
901 * sends a message with a clone handler argument.
904 devfs_msg_send_chandler(uint32_t cmd, char *name, d_clone_t handler)
906 devfs_msg_t devfs_msg = devfs_msg_get();
907 devfs_msg->m_chandler.name = name;
908 devfs_msg->m_chandler.nhandler = handler;
910 return devfs_msg_send(cmd, devfs_msg);
914 * sends a message with a device argument.
917 devfs_msg_send_dev(uint32_t cmd, cdev_t dev, uid_t uid, gid_t gid, int perms)
919 devfs_msg_t devfs_msg = devfs_msg_get();
920 devfs_msg->m_dev.dev = dev;
921 devfs_msg->m_dev.uid = uid;
922 devfs_msg->m_dev.gid = gid;
923 devfs_msg->m_dev.perms = perms;
925 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_send_dev -1- (%p)\n", dev);
927 return devfs_msg_send(cmd, devfs_msg);
931 * sends a message with a link argument.
935 devfs_msg_send_link(uint32_t cmd, char *name, char *target, struct mount *mp)
937 devfs_msg_t devfs_msg = devfs_msg_get();
938 devfs_msg->m_link.name = name;
939 devfs_msg->m_link.target = target;
940 devfs_msg->m_link.mp = mp;
943 return devfs_msg_send(cmd, devfs_msg);
947 * devfs_msg_core is the main devfs thread. It handles all incoming messages
948 * and calls the relevant worker functions. By using messages it's assured
949 * that events occur in the correct order.
952 devfs_msg_core(void *arg)
957 struct devfs_mnt_data *mnt;
958 struct devfs_node *node;
960 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_core -1-\n");
961 lwkt_initport_thread(&devfs_msg_port, curthread);
962 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_core -2-\n");
963 wakeup(td_core/*devfs_id*/);
964 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_core -3-\n");
967 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_core -loop:4-\n");
968 msg = (devfs_msg_t)lwkt_waitport(&devfs_msg_port, 0);
969 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_core, new msg: %x (unique id: %x)\n", (unsigned int)msg->hdr.u.ms_result, msg->id);
970 lockmgr(&devfs_lock, LK_EXCLUSIVE);
971 switch (msg->hdr.u.ms_result) {
973 case DEVFS_DEVICE_CREATE:
974 dev = msg->m_dev.dev;
975 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_core device create msg %s (%p)\n", dev->si_name, dev);
976 devfs_create_dev_worker(dev, msg->m_dev.uid, msg->m_dev.gid, msg->m_dev.perms);
979 case DEVFS_DEVICE_DESTROY:
980 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_core device destroy msg\n");
981 dev = msg->m_dev.dev;
982 devfs_destroy_dev_worker(dev);
985 case DEVFS_DESTROY_SUBNAMES:
986 devfs_destroy_subnames_worker(msg->m_load);
989 case DEVFS_DESTROY_DEV_BY_OPS:
990 devfs_destroy_dev_by_ops_worker(msg->m_ops.ops, msg->m_ops.minor);
993 case DEVFS_CREATE_ALL_DEV:
994 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_core device create ALL msg\n");
995 node = (struct devfs_node *)msg->m_load;
996 devfs_create_all_dev_worker(node);
999 case DEVFS_MOUNT_ADD:
1001 TAILQ_INSERT_TAIL(&devfs_mnt_list, mnt, link);
1002 devfs_create_all_dev_worker(mnt->root_node);
1005 case DEVFS_MOUNT_DEL:
1007 TAILQ_REMOVE(&devfs_mnt_list, mnt, link);
1008 devfs_debug(DEVFS_DEBUG_DEBUG, "There are still %d devfs_node elements!!!\n", mnt->leak_count);
1009 devfs_reaperp(mnt->root_node);
1010 devfs_debug(DEVFS_DEBUG_DEBUG, "Leaked %d devfs_node elements!!!\n", mnt->leak_count);
1013 case DEVFS_CHANDLER_ADD:
1014 devfs_chandler_add_worker(msg->m_chandler.name, msg->m_chandler.nhandler);
1017 case DEVFS_CHANDLER_DEL:
1018 devfs_chandler_del_worker(msg->m_chandler.name);
1021 case DEVFS_FIND_DEVICE_BY_NAME:
1022 devfs_find_device_by_name_worker(msg);
1025 case DEVFS_FIND_DEVICE_BY_UDEV:
1026 devfs_find_device_by_udev_worker(msg);
1029 case DEVFS_MAKE_ALIAS:
1030 devfs_make_alias_worker((struct devfs_alias *)msg->m_load);
1033 case DEVFS_APPLY_RULES:
1034 devfs_apply_reset_rules_caller(msg->m_name, 1);
1037 case DEVFS_RESET_RULES:
1038 devfs_apply_reset_rules_caller(msg->m_name, 0);
1041 case DEVFS_SCAN_CALLBACK:
1042 devfs_scan_callback_worker((devfs_scan_t *)msg->m_load);
1045 case DEVFS_TERMINATE_CORE:
1053 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_msg_core: unknown message received at core\n");
1055 lockmgr(&devfs_lock, LK_RELEASE);
1057 lwkt_replymsg((lwkt_msg_t)msg, 0);
1059 wakeup(td_core/*devfs_id*/);
1064 * Worker function to insert a new dev into the dev list and initialize its
1065 * permissions. It also calls devfs_propagate_dev which in turn propagates
1066 * the change to all mount points.
1069 devfs_create_dev_worker(cdev_t dev, uid_t uid, gid_t gid, int perms)
1072 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_dev_worker -1- -%s- (%p)\n", dev->si_name, dev);
1076 dev->si_perms = perms;
1078 devfs_link_dev(dev);
1080 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_dev_worker -2-\n");
1081 devfs_propagate_dev(dev, 1);
1083 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_dev_worker -end:3-\n");
1088 * Worker function to delete a dev from the dev list and free the cdev.
1089 * It also calls devfs_propagate_dev which in turn propagates the change
1090 * to all mount points.
1093 devfs_destroy_dev_worker(cdev_t dev)
1096 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1098 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_destroy_dev_worker -1- %s\n", dev->si_name);
1099 devfs_unlink_dev(dev);
1100 devfs_propagate_dev(dev, 0);
1103 //objcache_put(devfs_dev_cache, dev);
1105 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_destroy_dev_worker -end:5-\n");
1110 * Worker function to destroy all devices with a certain basename.
1111 * Calls devfs_destroy_dev_worker for the actual destruction.
1114 devfs_destroy_subnames_worker(char *name)
1117 //cdev_t found = NULL;
1118 size_t len = strlen(name);
1120 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1121 if (!strncmp(dev->si_name, name, len)) {
1122 if (dev->si_name[len] != '\0')
1123 devfs_destroy_dev_worker(dev);
1131 * Worker function that creates all device nodes on top of a devfs
1135 devfs_create_all_dev_worker(struct devfs_node *root)
1140 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_all_dev_worker -1-\n");
1142 TAILQ_FOREACH(dev, &devfs_dev_list, link) {
1143 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_all_dev_worker -loop:2- -%s-\n", dev->si_name);
1144 devfs_create_device_node(root, dev, NULL, NULL);
1146 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_all_dev_worker -end:3-\n");
1151 * Worker function that destroys all devices that match a specific
1152 * dev_ops and/or minor. If minor is less than 0, it is not matched
1153 * against. It also propagates all changes.
1156 devfs_destroy_dev_by_ops_worker(struct dev_ops *ops, int minor)
1161 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_destroy_dev_by_ops_worker -1-\n");
1163 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1164 if (dev->si_ops == ops) {
1165 if ((minor < 0) || (dev->si_uminor == minor)) {
1166 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_destroy_dev_by_ops_worker -loop:2- -%s-\n", dev->si_name);
1167 //TAILQ_REMOVE(&devfs_dev_list, dev, link);
1168 devfs_unlink_dev(dev);
1169 devfs_propagate_dev(dev, 0);
1171 //objcache_put(devfs_dev_cache, dev);
1175 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_destroy_dev_by_ops_worker -end:3-\n");
1180 * Worker function that registers a new clone handler in devfs.
1183 devfs_chandler_add_worker(char *name, d_clone_t *nhandler)
1185 struct devfs_clone_handler *chandler = NULL;
1186 u_char len = strlen(name);
1191 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1192 if (chandler->namlen == len) {
1193 if (!memcmp(chandler->name, name, len)) {
1194 /* Clonable basename already exists */
1200 chandler = kmalloc(sizeof(struct devfs_clone_handler), M_DEVFS, M_WAITOK);
1201 memcpy(chandler->name, name, len+1);
1202 chandler->namlen = len;
1203 chandler->nhandler = nhandler;
1205 TAILQ_INSERT_TAIL(&devfs_chandler_list, chandler, link);
1210 * Worker function that removes a given clone handler from the
1211 * clone handler list.
1214 devfs_chandler_del_worker(char *name)
1216 struct devfs_clone_handler *chandler, *chandler2;
1217 u_char len = strlen(name);
1222 TAILQ_FOREACH_MUTABLE(chandler, &devfs_chandler_list, link, chandler2) {
1223 if (chandler->namlen == len) {
1224 if (!memcmp(chandler->name, name, len)) {
1225 TAILQ_REMOVE(&devfs_chandler_list, chandler, link);
1226 kfree(chandler, M_DEVFS);
1236 * Worker function that finds a given device name and changes
1237 * the message received accordingly so that when replied to,
1238 * the answer is returned to the caller.
1241 devfs_find_device_by_name_worker(devfs_msg_t devfs_msg)
1244 cdev_t found = NULL;
1245 //devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_find_device_by_name: %s -1-\n", target);
1247 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1248 //devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_find_device_by_name -loop:2- -%s-\n", dev->si_name);
1249 if (!strcmp(devfs_msg->m_name, dev->si_name)) {
1254 devfs_msg->m_cdev = found;
1260 * Worker function that finds a given device udev and changes
1261 * the message received accordingly so that when replied to,
1262 * the answer is returned to the caller.
1265 devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg)
1268 cdev_t found = NULL;
1269 //devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_find_device_by_name: %s -1-\n", target);
1271 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1272 //devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_find_device_by_name -loop:2- -%s-\n", dev->si_name);
1273 if (((udev_t)dev->si_inode) == devfs_msg->m_udev) {
1278 devfs_msg->m_cdev = found;
1284 * Worker function that inserts a given alias into the
1285 * alias list, and propagates the alias to all mount
1289 devfs_make_alias_worker(struct devfs_alias *alias)
1291 struct devfs_alias *alias2;
1292 size_t len = strlen(alias->name);
1295 TAILQ_FOREACH(alias2, &devfs_alias_list, link) {
1296 if (!memcmp(alias->name, alias2->name, len)) {
1303 TAILQ_INSERT_TAIL(&devfs_alias_list, alias, link);
1304 devfs_alias_propagate(alias);
1306 devfs_debug(DEVFS_DEBUG_DEBUG, "Warning: duplicate devfs_make_alias for %s\n", alias->name);
1307 kfree(alias, M_DEVFS);
1314 * Function that removes and frees all aliases.
1317 devfs_alias_reap(void)
1319 struct devfs_alias *alias, *alias2;
1321 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1322 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1323 kfree(alias, M_DEVFS);
1329 * Function that removes an alias matching a specific cdev and frees
1333 devfs_alias_remove(cdev_t dev)
1335 struct devfs_alias *alias, *alias2;
1337 TAILQ_FOREACH_MUTABLE(alias, &devfs_alias_list, link, alias2) {
1338 if (alias->dev_target == dev) {
1339 TAILQ_REMOVE(&devfs_alias_list, alias, link);
1340 kfree(alias, M_DEVFS);
1347 * This function propagates a new alias to all mount points.
1350 devfs_alias_propagate(struct devfs_alias *alias)
1352 struct devfs_mnt_data *mnt;
1354 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1355 devfs_alias_apply(mnt->root_node, alias);
1361 * This function is a recursive function iterating through
1362 * all device nodes in the topology and, if applicable,
1363 * creating the relevant alias for a device node.
1366 devfs_alias_apply(struct devfs_node *node, struct devfs_alias *alias)
1368 struct devfs_node *node1, *node2;
1370 KKASSERT(alias != NULL);
1372 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
1373 devfs_debug(DEVFS_DEBUG_DEBUG, "This node is Pdir or Proot; has %d children\n", node->nchildren);
1374 if (node->nchildren > 2) {
1375 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
1376 devfs_alias_apply(node1, alias);
1380 if (node->d_dev == alias->dev_target)
1381 devfs_alias_create(alias->name, node);
1387 * This function checks if any alias possibly is applicable
1388 * to the given node. If so, the alias is created.
1391 devfs_alias_check_create(struct devfs_node *node)
1393 struct devfs_alias *alias;
1395 TAILQ_FOREACH(alias, &devfs_alias_list, link) {
1396 if (node->d_dev == alias->dev_target)
1397 devfs_alias_create(alias->name, node);
1403 * This function creates an alias with a given name
1404 * linking to a given devfs node. It also increments
1405 * the link count on the target node.
1408 devfs_alias_create(char *name_orig, struct devfs_node *target)
1410 struct mount *mp = target->mp;
1411 struct devfs_node *parent = DEVFS_MNTDATA(mp)->root_node;
1412 struct devfs_node *linknode;
1414 //char *path = NULL;
1415 char *create_path = NULL;
1416 char *name, name_buf[PATH_MAX];
1418 //XXX: possibly put this in many worker functions (at least those with ext. API)
1419 KKASSERT((lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE);
1421 devfs_resolve_name_path(name_orig, name_buf, &create_path, &name);
1424 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1427 if (devfs_find_device_node_by_name(parent, name)) {
1428 devfs_debug(DEVFS_DEBUG_DEBUG, "Node already exists: %s (devfs_make_alias_worker)!\n", name);
1433 linknode = devfs_allocp(Plink, name, parent, mp, NULL);
1434 if (linknode == NULL)
1437 linknode->link_target = target;
1439 //linknode->flags |= DEVFS_LINK;
1445 * This function is called by the core and handles mount point
1446 * strings. It either calls the relevant worker (devfs_apply_
1447 * reset_rules_worker) on all mountpoints or only a specific
1451 devfs_apply_reset_rules_caller(char *mountto, int apply)
1454 struct devfs_mnt_data *mnt;
1455 size_t len = strlen(mountto);
1457 if (mountto[0] != '*') {
1458 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1459 if ((len == mnt->mntonnamelen) &&
1460 (!memcmp(mnt->mp->mnt_stat.f_mntonname, mountto, len))) {
1461 devfs_apply_reset_rules_worker(mnt->root_node, apply);
1466 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1467 devfs_apply_reset_rules_worker(mnt->root_node, apply);
1471 kfree(mountto, M_DEVFS);
1476 * This worker function applies or resets, depending on the arguments, a rule
1477 * to the whole given topology. *RECURSIVE*
1480 devfs_apply_reset_rules_worker(struct devfs_node *node, int apply)
1482 struct devfs_node *node1, *node2;
1484 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
1485 devfs_debug(DEVFS_DEBUG_DEBUG, "This node is Pdir or Proot; has %d children\n", node->nchildren);
1486 if (node->nchildren > 2) {
1487 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
1488 devfs_apply_reset_rules_worker(node1, apply);
1494 devfs_rule_check_apply(node);
1496 devfs_rule_reset_node(node);
1503 * This function calls a given callback function for
1504 * every dev node in the devfs dev list.
1507 devfs_scan_callback_worker(devfs_scan_t *callback)
1511 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_scan_callback: %p -1-\n", callback);
1513 TAILQ_FOREACH_MUTABLE(dev, &devfs_dev_list, link, dev1) {
1517 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_scan_callback: finished\n");
1523 * This function tries to resolve a given directory, or if not
1524 * found and creation requested, creates the given directory.
1526 static struct devfs_node *
1527 devfs_resolve_or_create_dir(struct devfs_node *parent, char *dir_name, size_t name_len, int create)
1529 struct devfs_node *node, *found = NULL;
1531 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1532 if (name_len == node->d_dir.d_namlen) {
1533 if (!memcmp(dir_name, node->d_dir.d_name, name_len)) {
1540 if ((found == NULL) && (create)) {
1541 found = devfs_allocp(Pdir, dir_name, parent, parent->mp, NULL);
1548 * This function tries to resolve a complete path. If creation is requested,
1549 * if a given part of the path cannot be resolved (because it doesn't exist),
1553 devfs_resolve_or_create_path(struct devfs_node *parent, char *path, int create)
1555 struct devfs_node *node = parent;
1564 for (; *path != '\0' ; path++) {
1569 node = devfs_resolve_or_create_dir(node, buf, idx, create);
1576 return devfs_resolve_or_create_dir(node, buf, idx, create);
1580 * Takes a full path and strips it into a directory path and a name.
1581 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It
1582 * requires a working buffer with enough size to keep the whole
1586 devfs_resolve_name_path(char *fullpath, char *buf, char **pathp, char **namep)
1590 size_t len = strlen(fullpath) + 1;
1593 KKASSERT((fullpath != NULL) && (buf != NULL) && (pathp != NULL) && (namep != NULL));
1595 memcpy(buf, fullpath, len);
1597 for (i = len-1; i>= 0; i--) {
1598 if (buf[i] == '/') {
1618 * This function creates a new devfs node for a given device. It can
1619 * handle a complete path as device name, and accordingly creates
1620 * the path and the final device node.
1623 devfs_create_device_node(struct devfs_node *root, cdev_t dev, char *dev_name, char *path_fmt, ...)
1625 struct devfs_node *parent, *node = NULL;
1627 char *name, name_buf[PATH_MAX];
1631 char *create_path = NULL;
1632 char *names = "pqrsPQRS";
1635 //devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_device_node : -%s- (%p)\n", dev->si_name, dev);
1637 if (path_fmt != NULL) {
1638 path = kmalloc(PATH_MAX+1, M_DEVFS, M_WAITOK);
1640 __va_start(ap, path_fmt);
1641 i = kvcprintf(path_fmt, NULL, path, 10, ap);
1646 parent = devfs_resolve_or_create_path(root, path, 1);
1652 devfs_resolve_name_path(((dev_name == NULL) && (dev))?(dev->si_name):(dev_name), name_buf, &create_path, &name);
1655 parent = devfs_resolve_or_create_path(parent, create_path, 1);
1658 if (devfs_find_device_node_by_name(parent, name)) {
1659 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_device_node: DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name);
1662 devfs_debug(DEVFS_DEBUG_DEBUG, "parent->d_dir.d_name=%s\n", parent->d_dir.d_name);
1663 node = devfs_allocp(Pdev, name, parent, parent->mp, dev);
1664 devfs_debug(DEVFS_DEBUG_DEBUG, "node->d_dir.d_name=%s\n", node->d_dir.d_name);
1666 /* Ugly unix98 pty magic, to hide pty master (ptm) devices and their directory */
1667 if ((dev) && (strlen(dev->si_name) >= 4) && (!memcmp(dev->si_name, "ptm/", 4))) {
1668 //node->parent->flags |= DEVFS_HIDDEN;
1669 //node->flags |= DEVFS_HIDDEN;
1671 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_device_node: marker A\n");
1672 /* Ugly pty magic, to tag pty devices as such and hide them if needed */
1673 if ((strlen(name) >= 3) && (!memcmp(name, "pty", 3)))
1674 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1676 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_device_node: marker B\n");
1677 if ((strlen(name) >= 3) && (!memcmp(name, "tty", 3))) {
1679 for (i = 0; i < strlen(names); i++) {
1680 if (name[3] == names[i]) {
1686 node->flags |= (DEVFS_PTY | DEVFS_INVISIBLE);
1688 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_create_device_node: marker C\n");
1691 if (path_fmt != NULL)
1692 kfree(path, M_DEVFS);
1700 * This function finds a given device node in the topology with a given
1704 devfs_find_device_node(struct devfs_node *node, cdev_t target)
1706 struct devfs_node *node1, *node2, *found = NULL;
1708 if ((node->node_type == Proot) || (node->node_type == Pdir)) {
1709 devfs_debug(DEVFS_DEBUG_DEBUG, "This node is Pdir or Proot; has %d children\n", node->nchildren);
1710 if (node->nchildren > 2) {
1711 TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node), link, node2) {
1712 if ((found = devfs_find_device_node(node1, target)))
1716 } else if (node->node_type == Pdev) {
1717 if (node->d_dev == target)
1720 //devfs_debug(DEVFS_DEBUG_DEBUG, "This node is called %s\n", (found)?found->d_dir.d_name:"NOTFOUND");
1726 * This function finds a device node in the topology by its
1727 * name and returns it.
1730 devfs_find_device_node_by_name(struct devfs_node *parent, char *target)
1732 struct devfs_node *node, *found = NULL;
1733 size_t len = strlen(target);
1735 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(parent), link) {
1736 if ((len == node->d_dir.d_namlen) && (!memcmp(node->d_dir.d_name, target, len))) {
1746 * This function takes a cdev and destroys its devfs node in the
1750 devfs_destroy_device_node(struct devfs_node *root, cdev_t target)
1752 struct devfs_node *node, *parent;
1754 char *name, name_buf[PATH_MAX];
1758 char *create_path = NULL;
1764 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_destroy_device_node\n");
1765 memcpy(name_buf, target->si_name, strlen(target->si_name)+1);
1767 devfs_resolve_name_path(target->si_name, name_buf, &create_path, &name);
1768 devfs_debug(DEVFS_DEBUG_DEBUG, "create_path: %s\n", create_path);
1769 devfs_debug(DEVFS_DEBUG_DEBUG, "name: %s\n", name);
1772 parent = devfs_resolve_or_create_path(root, create_path, 0);
1775 devfs_debug(DEVFS_DEBUG_DEBUG, "-> marker <-\n");
1778 devfs_debug(DEVFS_DEBUG_DEBUG, "->d_dir.d_name=%s\n", parent->d_dir.d_name);
1779 node = devfs_find_device_node_by_name(parent, name);
1780 devfs_debug(DEVFS_DEBUG_DEBUG, "->d_dir.d_name=%s\n", (node)?(node->d_dir.d_name):"SHIT!");
1789 * Just set perms and ownership for given node.
1792 devfs_set_perms(struct devfs_node *node, uid_t uid, gid_t gid, u_short mode, u_long flags)
1794 node->mode = mode; /* files access mode and type */
1795 node->uid = uid; /* owner user id */
1796 node->gid = gid; /* owner group id */
1797 //node->flags = flags;
1803 * Propagates a device attach/detach to all mount
1804 * points. Also takes care of automatic alias removal
1805 * for a deleted cdev.
1808 devfs_propagate_dev(cdev_t dev, int attach)
1810 struct devfs_mnt_data *mnt;
1812 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_propagate_dev -1-\n");
1813 TAILQ_FOREACH(mnt, &devfs_mnt_list, link) {
1814 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_propagate_dev -loop:2-\n");
1816 /* Device is being attached */
1817 //devfs_create_device_node(struct devfs_node *root, struct devfs_dev *dev, char *dev_name, char *path_fmt, ...)
1818 devfs_create_device_node(mnt->root_node, dev, NULL, NULL );
1820 /* Device is being detached */
1821 //devfs_destroy_device_node(struct devfs_node *root, struct devfs_dev *target)
1822 devfs_alias_remove(dev);
1823 devfs_destroy_device_node(mnt->root_node, dev);
1826 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_propagate_dev -end:3-\n");
1831 * devfs_node_to_path takes a node and a buffer of a size of
1832 * at least PATH_MAX, resolves the full path from the root
1833 * node and writes it in a humanly-readable format into the
1835 * If DEVFS_STASH_DEPTH is less than the directory level up
1836 * to the root node, only the last DEVFS_STASH_DEPTH levels
1837 * of the path are resolved.
1840 devfs_node_to_path(struct devfs_node *node, char *buffer)
1842 #define DEVFS_STASH_DEPTH 32
1843 struct devfs_node *node_stash[DEVFS_STASH_DEPTH];
1845 memset(buffer, 0, PATH_MAX);
1847 for (i = 0; (i < DEVFS_STASH_DEPTH) && (node->node_type != Proot); i++) {
1848 node_stash[i] = node;
1849 node = node->parent;
1853 for (offset = 0; i >= 0; i--) {
1854 memcpy(buffer+offset, node_stash[i]->d_dir.d_name, node_stash[i]->d_dir.d_namlen);
1855 offset += node_stash[i]->d_dir.d_namlen;
1857 *(buffer+offset) = '/';
1861 #undef DEVFS_STASH_DEPTH
1866 * devfs_clone either returns a basename from a complete name by
1867 * returning the length of the name without trailing digits, or,
1868 * if clone != 0, calls the device's clone handler to get a new
1869 * device, which in turn is returned in devp.
1872 devfs_clone(char *name, size_t *namlenp, cdev_t *devp, int clone, struct ucred *cred)
1876 size_t len = *namlenp;
1878 struct devfs_clone_handler *chandler;
1879 struct dev_clone_args ap;
1882 for (; (len > 0) && (DEVFS_ISDIGIT(name[len-1])); len--);
1885 TAILQ_FOREACH(chandler, &devfs_chandler_list, link) {
1886 devfs_debug(DEVFS_DEBUG_DEBUG, "len=%d, chandler->namlen=%d\n", len, chandler->namlen);
1887 devfs_debug(DEVFS_DEBUG_DEBUG, "name=%s, chandler->name=%s\n", name, chandler->name);
1888 if ((chandler->namlen == len) &&
1889 (!memcmp(chandler->name, name, len)) &&
1890 (chandler->nhandler)) {
1891 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_nclone: found clone handler for the base name at %p\n", chandler->nhandler);
1897 error = (chandler->nhandler)(&ap);
1914 * Registers a new orphan in the orphan list.
1917 devfs_tracer_add_orphan(struct devfs_node *node)
1919 struct devfs_orphan *orphan;
1922 orphan = kmalloc(sizeof(struct devfs_orphan), M_DEVFS, M_WAITOK);
1923 orphan->node = node;
1925 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node->mp), orphan, link);
1929 * Removes an orphan from the orphan list.
1932 devfs_tracer_del_orphan(struct devfs_node *node)
1934 struct devfs_orphan *orphan;
1938 TAILQ_FOREACH(orphan, DEVFS_ORPHANLIST(node->mp), link) {
1939 if (orphan->node == node) {
1940 TAILQ_REMOVE(DEVFS_ORPHANLIST(node->mp), orphan, link);
1941 kfree(orphan, M_DEVFS);
1948 * Counts the orphans in the orphan list, and if cleanup
1949 * is specified, also frees the orphan and removes it from
1953 devfs_tracer_orphan_count(struct mount *mp, int cleanup)
1955 struct devfs_orphan *orphan, *orphan2;
1958 TAILQ_FOREACH_MUTABLE(orphan, DEVFS_ORPHANLIST(mp), link, orphan2) {
1961 orphan->node->flags |= DEVFS_NO_TRACE;
1962 devfs_freep(orphan->node);
1963 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp), orphan, link);
1964 kfree(orphan, M_DEVFS);
1972 * Fetch an ino_t from the global d_ino by increasing it
1976 devfs_fetch_ino(void)
1980 spin_lock_wr(&ino_lock);
1982 spin_unlock_wr(&ino_lock);
1988 * Allocates a new cdev and initializes it's most basic
1992 devfs_new_cdev(struct dev_ops *ops, int minor)
1994 // cdev_t dev = objcache_get(devfs_dev_cache, M_WAITOK);
1995 // memset(dev, 0, sizeof(struct cdev));
1997 cdev_t dev = sysref_alloc(&cdev_sysref_class);
1998 sysref_activate(&dev->si_sysref);
2000 devfs_debug(DEVFS_DEBUG_DEBUG, "new_cdev: clearing first %d bytes\n", offsetof(struct cdev, si_sysref));
2001 memset(dev, 0, offsetof(struct cdev, si_sysref));
2006 dev->si_drv1 = NULL;
2007 dev->si_drv2 = NULL;
2008 dev->si_lastread = 0; /* time_second */
2009 dev->si_lastwrite = 0; /* time_second */
2012 dev->si_flags = SI_HASHED | SI_ADHOC; //XXX: any real use?
2014 dev->si_uminor = minor;
2015 dev->si_inode = devfs_fetch_ino();
2021 static void devfs_cdev_terminate(cdev_t dev)
2025 /* Check if it is locked already. if not, we acquire the devfs lock */
2026 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
2027 lockmgr(&devfs_lock, LK_EXCLUSIVE);
2031 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_cdev_terminate: Taking care of dev->si_name=%s\n", dev->si_name);
2033 /* Propagate destruction, just in case */
2034 devfs_propagate_dev(dev, 0);
2036 /* If we acquired the lock, we also get rid of it */
2038 lockmgr(&devfs_lock, LK_RELEASE);
2040 /* Finally destroy the device */
2041 sysref_put(&dev->si_sysref);
2045 * Frees a given cdev
2048 devfs_destroy_cdev(cdev_t dev)
2051 //objcache_put(devfs_dev_cache, dev);
2056 * Links a given cdev into the dev list.
2059 devfs_link_dev(cdev_t dev)
2061 dev->si_flags |= SI_DEVFS_LINKED;
2062 TAILQ_INSERT_TAIL(&devfs_dev_list, dev, link);
2068 * Removes a given cdev from the dev list.
2071 devfs_unlink_dev(cdev_t dev)
2073 if ((dev->si_flags & SI_DEVFS_LINKED)) {
2074 TAILQ_REMOVE(&devfs_dev_list, dev, link);
2075 dev->si_flags &= ~SI_DEVFS_LINKED;
2082 devfs_config(void *arg)
2086 msg = devfs_msg_get();
2088 kprintf("devfs_config: sync'ing up\n");
2089 msg = devfs_msg_send_sync(DEVFS_SYNC, msg);
2094 * Called on init of devfs; creates the objcaches and
2095 * spawns off the devfs core thread. Also initializes
2101 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init() called\n");
2102 /* Create objcaches for nodes, msgs and devs */
2103 devfs_node_cache = objcache_create("devfs-node-cache", 0, 0,
2105 objcache_malloc_alloc,
2106 objcache_malloc_free,
2107 &devfs_node_malloc_args );
2109 devfs_msg_cache = objcache_create("devfs-msg-cache", 0, 0,
2111 objcache_malloc_alloc,
2112 objcache_malloc_free,
2113 &devfs_msg_malloc_args );
2115 devfs_dev_cache = objcache_create("devfs-dev-cache", 0, 0,
2117 objcache_malloc_alloc,
2118 objcache_malloc_free,
2119 &devfs_dev_malloc_args );
2121 /* Initialize the reply-only port which acts as a message drain */
2122 lwkt_initport_replyonly(&devfs_dispose_port, devfs_msg_autofree_reply);
2124 /* Initialize *THE* devfs lock */
2125 lockinit(&devfs_lock, "devfs_core lock", 0, 0);
2128 lwkt_create(devfs_msg_core, /*args*/NULL, &td_core, NULL,
2129 0, 0, "devfs_msg_core");
2131 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2133 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_init finished\n");
2137 * Called on unload of devfs; takes care of destroying the core
2138 * and the objcaches. Also removes aliases that are no longer needed.
2143 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
2145 devfs_msg_send(DEVFS_TERMINATE_CORE, NULL);
2147 tsleep(td_core/*devfs_id*/, 0, "devfsc", 0);
2148 tsleep(td_core/*devfs_id*/, 0, "devfsc", 10000);
2150 /* Destroy the objcaches */
2151 objcache_destroy(devfs_msg_cache);
2152 objcache_destroy(devfs_node_cache);
2153 objcache_destroy(devfs_dev_cache);
2159 * This is a sysctl handler to assist userland devname(3) to
2160 * find the device name for a given udev.
2163 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS)
2170 if ((error = SYSCTL_IN(req, &udev, sizeof(udev_t))))
2173 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs sysctl, received udev: %d\n", udev);
2178 if ((found = devfs_find_device_by_udev(udev)) == NULL)
2181 return(SYSCTL_OUT(req, found->si_name, strlen(found->si_name) + 1));
2185 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
2186 NULL, 0, devfs_sysctl_devname_helper, "", "helper for devname(3)");
2188 static SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
2189 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable);
2190 SYSCTL_INT(_vfs_devfs, OID_AUTO, debug, CTLFLAG_RW, &devfs_debug_enable, 0, "Enable DevFS debugging");
2192 SYSINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, devfs_init, NULL);
2193 SYSUNINIT(vfs_devfs_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, devfs_uninit, NULL);