2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/mount.h>
38 #include <sys/vnode.h>
39 #include <sys/types.h>
41 #include <sys/msgport.h>
42 #include <sys/msgport2.h>
43 #include <sys/spinlock2.h>
44 #include <sys/sysctl.h>
45 #include <sys/ucred.h>
46 #include <sys/param.h>
47 #include <sys/sysref2.h>
48 #include <sys/systm.h>
49 #include <sys/devfs.h>
50 #include <sys/devfs_rules.h>
52 MALLOC_DEFINE(M_DEVFS
, "devfs", "Device File System (devfs) allocations");
53 DEVFS_DECLARE_CLONE_BITMAP(ops_id
);
55 * SYSREF Integration - reference counting, allocation,
56 * sysid and syslink integration.
58 static void devfs_cdev_terminate(cdev_t dev
);
59 static struct sysref_class cdev_sysref_class
= {
62 .proto
= SYSREF_PROTO_DEV
,
63 .offset
= offsetof(struct cdev
, si_sysref
),
64 .objsize
= sizeof(struct cdev
),
68 .terminate
= (sysref_terminate_func_t
)devfs_cdev_terminate
72 static struct objcache
*devfs_node_cache
;
73 static struct objcache
*devfs_msg_cache
;
74 static struct objcache
*devfs_dev_cache
;
76 static struct objcache_malloc_args devfs_node_malloc_args
= {
77 sizeof(struct devfs_node
), M_DEVFS
};
78 struct objcache_malloc_args devfs_msg_malloc_args
= {
79 sizeof(struct devfs_msg
), M_DEVFS
};
80 struct objcache_malloc_args devfs_dev_malloc_args
= {
81 sizeof(struct cdev
), M_DEVFS
};
83 static struct devfs_dev_head devfs_dev_list
=
84 TAILQ_HEAD_INITIALIZER(devfs_dev_list
);
85 static struct devfs_mnt_head devfs_mnt_list
=
86 TAILQ_HEAD_INITIALIZER(devfs_mnt_list
);
87 static struct devfs_chandler_head devfs_chandler_list
=
88 TAILQ_HEAD_INITIALIZER(devfs_chandler_list
);
89 static struct devfs_alias_head devfs_alias_list
=
90 TAILQ_HEAD_INITIALIZER(devfs_alias_list
);
91 static struct devfs_dev_ops_head devfs_dev_ops_list
=
92 TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list
);
94 struct lock devfs_lock
;
95 static struct lwkt_port devfs_dispose_port
;
96 static struct lwkt_port devfs_msg_port
;
97 static struct thread
*td_core
;
99 static struct spinlock ino_lock
;
101 static int devfs_debug_enable
;
102 static int devfs_run
;
104 static ino_t
devfs_fetch_ino(void);
105 static int devfs_create_all_dev_worker(struct devfs_node
*);
106 static int devfs_create_dev_worker(cdev_t
, uid_t
, gid_t
, int);
107 static int devfs_destroy_dev_worker(cdev_t
);
108 static int devfs_destroy_subnames_worker(char *);
109 static int devfs_destroy_dev_by_ops_worker(struct dev_ops
*, int);
110 static int devfs_propagate_dev(cdev_t
, int);
111 static int devfs_unlink_dev(cdev_t dev
);
112 static void devfs_msg_exec(devfs_msg_t msg
);
114 static int devfs_chandler_add_worker(const char *, d_clone_t
*);
115 static int devfs_chandler_del_worker(const char *);
117 static void devfs_msg_autofree_reply(lwkt_port_t
, lwkt_msg_t
);
118 static void devfs_msg_core(void *);
120 static int devfs_find_device_by_name_worker(devfs_msg_t
);
121 static int devfs_find_device_by_udev_worker(devfs_msg_t
);
123 static int devfs_apply_reset_rules_caller(char *, int);
125 static int devfs_scan_callback_worker(devfs_scan_t
*);
127 static struct devfs_node
*devfs_resolve_or_create_dir(struct devfs_node
*,
128 char *, size_t, int);
130 static int devfs_make_alias_worker(struct devfs_alias
*);
131 static int devfs_alias_remove(cdev_t
);
132 static int devfs_alias_reap(void);
133 static int devfs_alias_propagate(struct devfs_alias
*);
134 static int devfs_alias_apply(struct devfs_node
*, struct devfs_alias
*);
135 static int devfs_alias_check_create(struct devfs_node
*);
137 static int devfs_clr_subnames_flag_worker(char *, uint32_t);
138 static int devfs_destroy_subnames_without_flag_worker(char *, uint32_t);
140 static void *devfs_reaperp_callback(struct devfs_node
*, void *);
141 static void *devfs_gc_dirs_callback(struct devfs_node
*, void *);
142 static void *devfs_gc_links_callback(struct devfs_node
*, struct devfs_node
*);
144 devfs_inode_to_vnode_worker_callback(struct devfs_node
*, ino_t
*);
147 * devfs_debug() is a SYSCTL and TUNABLE controlled debug output function
151 devfs_debug(int level
, char *fmt
, ...)
156 if (level
<= devfs_debug_enable
)
164 * devfs_allocp() Allocates a new devfs node with the specified
165 * parameters. The node is also automatically linked into the topology
166 * if a parent is specified. It also calls the rule and alias stuff to
167 * be applied on the new node
170 devfs_allocp(devfs_nodetype devfsnodetype
, char *name
,
171 struct devfs_node
*parent
, struct mount
*mp
, cdev_t dev
)
173 struct devfs_node
*node
= NULL
;
174 size_t namlen
= strlen(name
);
176 node
= objcache_get(devfs_node_cache
, M_WAITOK
);
177 bzero(node
, sizeof(*node
));
179 atomic_add_long(&(DEVFS_MNTDATA(mp
)->leak_count
), 1);
184 node
->d_dir
.d_ino
= devfs_fetch_ino();
187 * Cookie jar for children. Leave 0 and 1 for '.' and '..' entries
190 node
->cookie_jar
= 2;
193 * Access Control members
195 node
->mode
= DEVFS_DEFAULT_MODE
;
196 node
->uid
= DEVFS_DEFAULT_UID
;
197 node
->gid
= DEVFS_DEFAULT_GID
;
199 switch (devfsnodetype
) {
202 * Ensure that we don't recycle the root vnode by marking it as
203 * linked into the topology.
205 node
->flags
|= DEVFS_NODE_LINKED
;
207 TAILQ_INIT(DEVFS_DENODE_HEAD(node
));
208 node
->d_dir
.d_type
= DT_DIR
;
213 node
->d_dir
.d_type
= DT_LNK
;
217 node
->d_dir
.d_type
= DT_REG
;
222 node
->d_dir
.d_type
= DT_CHR
;
225 node
->mode
= dev
->si_perms
;
226 node
->uid
= dev
->si_uid
;
227 node
->gid
= dev
->si_gid
;
229 devfs_alias_check_create(node
);
234 panic("devfs_allocp: unknown node type");
238 node
->node_type
= devfsnodetype
;
240 /* Initialize the dirent structure of each devfs vnode */
241 KKASSERT(namlen
< 256);
242 node
->d_dir
.d_namlen
= namlen
;
243 node
->d_dir
.d_name
= kmalloc(namlen
+1, M_DEVFS
, M_WAITOK
);
244 memcpy(node
->d_dir
.d_name
, name
, namlen
);
245 node
->d_dir
.d_name
[namlen
] = '\0';
247 /* Initialize the parent node element */
248 node
->parent
= parent
;
251 devfs_rule_check_apply(node
, NULL
);
253 /* Initialize *time members */
254 nanotime(&node
->atime
);
255 node
->mtime
= node
->ctime
= node
->atime
;
258 * Associate with parent as last step, clean out namecache
261 if ((parent
!= NULL
) &&
262 ((parent
->node_type
== Proot
) || (parent
->node_type
== Pdir
))) {
264 node
->cookie
= parent
->cookie_jar
++;
265 node
->flags
|= DEVFS_NODE_LINKED
;
266 TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent
), node
, link
);
268 /* This forces negative namecache lookups to clear */
269 ++mp
->mnt_namecache_gen
;
272 ++DEVFS_MNTDATA(mp
)->file_count
;
278 * devfs_allocv() allocates a new vnode based on a devfs node.
281 devfs_allocv(struct vnode
**vpp
, struct devfs_node
*node
)
289 while ((vp
= node
->v_node
) != NULL
) {
290 error
= vget(vp
, LK_EXCLUSIVE
);
291 if (error
!= ENOENT
) {
297 if ((error
= getnewvnode(VT_DEVFS
, node
->mp
, vpp
, 0, 0)) != 0)
302 if (node
->v_node
!= NULL
) {
311 switch (node
->node_type
) {
328 KKASSERT(node
->d_dev
);
330 vp
->v_uminor
= node
->d_dev
->si_uminor
;
333 v_associate_rdev(vp
, node
->d_dev
);
334 vp
->v_ops
= &node
->mp
->mnt_vn_spec_ops
;
338 panic("devfs_allocv: unknown node type");
346 * devfs_allocvp allocates both a devfs node (with the given settings) and a vnode
347 * based on the newly created devfs node.
350 devfs_allocvp(struct mount
*mp
, struct vnode
**vpp
, devfs_nodetype devfsnodetype
,
351 char *name
, struct devfs_node
*parent
, cdev_t dev
)
353 struct devfs_node
*node
;
355 node
= devfs_allocp(devfsnodetype
, name
, parent
, mp
, dev
);
358 devfs_allocv(vpp
, node
);
366 * Destroy the devfs_node. The node must be unlinked from the topology.
368 * This function will also destroy any vnode association with the node
371 * The cdev_t itself remains intact.
374 devfs_freep(struct devfs_node
*node
)
379 KKASSERT(((node
->flags
& DEVFS_NODE_LINKED
) == 0) ||
380 (node
->node_type
== Proot
));
381 KKASSERT((node
->flags
& DEVFS_DESTROYED
) == 0);
383 atomic_subtract_long(&(DEVFS_MNTDATA(node
->mp
)->leak_count
), 1);
384 if (node
->symlink_name
) {
385 kfree(node
->symlink_name
, M_DEVFS
);
386 node
->symlink_name
= NULL
;
390 * Remove the node from the orphan list if it is still on it.
392 if (node
->flags
& DEVFS_ORPHANED
)
393 devfs_tracer_del_orphan(node
);
396 * Disassociate the vnode from the node. This also prevents the
397 * vnode's reclaim code from double-freeing the node.
399 * The vget is needed to safely modify the vp. It also serves
400 * to cycle the refs and terminate the vnode if it happens to
401 * be inactive, otherwise namecache references may not get cleared.
403 while ((vp
= node
->v_node
) != NULL
) {
404 if (vget(vp
, LK_EXCLUSIVE
| LK_RETRY
) != 0)
409 cache_inval_vp(vp
, CINV_DESTROY
);
412 if (node
->d_dir
.d_name
) {
413 kfree(node
->d_dir
.d_name
, M_DEVFS
);
414 node
->d_dir
.d_name
= NULL
;
416 node
->flags
|= DEVFS_DESTROYED
;
418 --DEVFS_MNTDATA(node
->mp
)->file_count
;
420 objcache_put(devfs_node_cache
, node
);
426 * Unlink the devfs node from the topology and add it to the orphan list.
427 * The node will later be destroyed by freep.
429 * Any vnode association, including the v_rdev and v_data, remains intact
433 devfs_unlinkp(struct devfs_node
*node
)
435 struct devfs_node
*parent
;
439 * Add the node to the orphan list, so it is referenced somewhere, to
440 * so we don't leak it.
442 devfs_tracer_add_orphan(node
);
444 parent
= node
->parent
;
447 * If the parent is known we can unlink the node out of the topology
450 TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent
), node
, link
);
452 KKASSERT((parent
->nchildren
>= 0));
453 node
->flags
&= ~DEVFS_NODE_LINKED
;
460 devfs_iterate_topology(struct devfs_node
*node
,
461 devfs_iterate_callback_t
*callback
, void *arg1
)
463 struct devfs_node
*node1
, *node2
;
466 if ((node
->node_type
== Proot
) || (node
->node_type
== Pdir
)) {
467 if (node
->nchildren
> 2) {
468 TAILQ_FOREACH_MUTABLE(node1
, DEVFS_DENODE_HEAD(node
),
470 if ((ret
= devfs_iterate_topology(node1
, callback
, arg1
)))
476 ret
= callback(node
, arg1
);
481 * devfs_reaperp() is a recursive function that iterates through all the
482 * topology, unlinking and freeing all devfs nodes.
485 devfs_reaperp_callback(struct devfs_node
*node
, void *unused
)
494 devfs_gc_dirs_callback(struct devfs_node
*node
, void *unused
)
496 if (node
->node_type
== Pdir
) {
497 if (node
->nchildren
== 2) {
507 devfs_gc_links_callback(struct devfs_node
*node
, struct devfs_node
*target
)
509 if ((node
->node_type
== Plink
) && (node
->link_target
== target
)) {
518 * devfs_gc() is devfs garbage collector. It takes care of unlinking and
519 * freeing a node, but also removes empty directories and links that link
520 * via devfs auto-link mechanism to the node being deleted.
523 devfs_gc(struct devfs_node
*node
)
525 struct devfs_node
*root_node
= DEVFS_MNTDATA(node
->mp
)->root_node
;
527 if (node
->nlinks
> 0)
528 devfs_iterate_topology(root_node
,
529 (devfs_iterate_callback_t
*)devfs_gc_links_callback
, node
);
532 devfs_iterate_topology(root_node
,
533 (devfs_iterate_callback_t
*)devfs_gc_dirs_callback
, NULL
);
541 * devfs_create_dev() is the asynchronous entry point for device creation.
542 * It just sends a message with the relevant details to the devfs core.
544 * This function will reference the passed device. The reference is owned
545 * by devfs and represents all of the device's node associations.
548 devfs_create_dev(cdev_t dev
, uid_t uid
, gid_t gid
, int perms
)
551 devfs_msg_send_dev(DEVFS_DEVICE_CREATE
, dev
, uid
, gid
, perms
);
557 * devfs_destroy_dev() is the asynchronous entry point for device destruction.
558 * It just sends a message with the relevant details to the devfs core.
561 devfs_destroy_dev(cdev_t dev
)
563 devfs_msg_send_dev(DEVFS_DEVICE_DESTROY
, dev
, 0, 0, 0);
568 * devfs_mount_add() is the synchronous entry point for adding a new devfs
569 * mount. It sends a synchronous message with the relevant details to the
573 devfs_mount_add(struct devfs_mnt_data
*mnt
)
577 msg
= devfs_msg_get();
579 msg
= devfs_msg_send_sync(DEVFS_MOUNT_ADD
, msg
);
586 * devfs_mount_del() is the synchronous entry point for removing a devfs mount.
587 * It sends a synchronous message with the relevant details to the devfs core.
590 devfs_mount_del(struct devfs_mnt_data
*mnt
)
594 msg
= devfs_msg_get();
596 msg
= devfs_msg_send_sync(DEVFS_MOUNT_DEL
, msg
);
603 * devfs_destroy_subnames() is the synchronous entry point for device
604 * destruction by subname. It just sends a message with the relevant details to
608 devfs_destroy_subnames(char *name
)
612 msg
= devfs_msg_get();
613 msg
->mdv_load
= name
;
614 msg
= devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES
, msg
);
620 devfs_clr_subnames_flag(char *name
, uint32_t flag
)
624 msg
= devfs_msg_get();
625 msg
->mdv_flags
.name
= name
;
626 msg
->mdv_flags
.flag
= flag
;
627 msg
= devfs_msg_send_sync(DEVFS_CLR_SUBNAMES_FLAG
, msg
);
634 devfs_destroy_subnames_without_flag(char *name
, uint32_t flag
)
638 msg
= devfs_msg_get();
639 msg
->mdv_flags
.name
= name
;
640 msg
->mdv_flags
.flag
= flag
;
641 msg
= devfs_msg_send_sync(DEVFS_DESTROY_SUBNAMES_WO_FLAG
, msg
);
648 * devfs_create_all_dev is the asynchronous entry point to trigger device
649 * node creation. It just sends a message with the relevant details to
653 devfs_create_all_dev(struct devfs_node
*root
)
655 devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV
, root
);
660 * devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all
661 * devices with a specific set of dev_ops and minor. It just sends a
662 * message with the relevant details to the devfs core.
665 devfs_destroy_dev_by_ops(struct dev_ops
*ops
, int minor
)
667 devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS
, ops
, minor
);
672 * devfs_clone_handler_add is the synchronous entry point to add a new
673 * clone handler. It just sends a message with the relevant details to
677 devfs_clone_handler_add(const char *name
, d_clone_t
*nhandler
)
681 msg
= devfs_msg_get();
682 msg
->mdv_chandler
.name
= name
;
683 msg
->mdv_chandler
.nhandler
= nhandler
;
684 msg
= devfs_msg_send_sync(DEVFS_CHANDLER_ADD
, msg
);
690 * devfs_clone_handler_del is the synchronous entry point to remove a
691 * clone handler. It just sends a message with the relevant details to
695 devfs_clone_handler_del(const char *name
)
699 msg
= devfs_msg_get();
700 msg
->mdv_chandler
.name
= name
;
701 msg
->mdv_chandler
.nhandler
= NULL
;
702 msg
= devfs_msg_send_sync(DEVFS_CHANDLER_DEL
, msg
);
708 * devfs_find_device_by_name is the synchronous entry point to find a
709 * device given its name. It sends a synchronous message with the
710 * relevant details to the devfs core and returns the answer.
713 devfs_find_device_by_name(const char *fmt
, ...)
724 kvasnrprintf(&target
, PATH_MAX
, 10, fmt
, ap
);
727 msg
= devfs_msg_get();
728 msg
->mdv_name
= target
;
729 msg
= devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME
, msg
);
730 found
= msg
->mdv_cdev
;
738 * devfs_find_device_by_udev is the synchronous entry point to find a
739 * device given its udev number. It sends a synchronous message with
740 * the relevant details to the devfs core and returns the answer.
743 devfs_find_device_by_udev(udev_t udev
)
748 msg
= devfs_msg_get();
749 msg
->mdv_udev
= udev
;
750 msg
= devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV
, msg
);
751 found
= msg
->mdv_cdev
;
754 devfs_debug(DEVFS_DEBUG_DEBUG
,
755 "devfs_find_device_by_udev found? %s -end:3-\n",
756 ((found
) ? found
->si_name
:"NO"));
761 devfs_inode_to_vnode(struct mount
*mp
, ino_t target
)
763 struct vnode
*vp
= NULL
;
769 msg
= devfs_msg_get();
770 msg
->mdv_ino
.mp
= mp
;
771 msg
->mdv_ino
.ino
= target
;
772 msg
= devfs_msg_send_sync(DEVFS_INODE_TO_VNODE
, msg
);
773 vp
= msg
->mdv_ino
.vp
;
774 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
781 * devfs_make_alias is the asynchronous entry point to register an alias
782 * for a device. It just sends a message with the relevant details to the
786 devfs_make_alias(const char *name
, cdev_t dev_target
)
788 struct devfs_alias
*alias
;
793 alias
= kmalloc(sizeof(struct devfs_alias
), M_DEVFS
, M_WAITOK
);
794 alias
->name
= kstrdup(name
, M_DEVFS
);
796 alias
->dev_target
= dev_target
;
798 devfs_msg_send_generic(DEVFS_MAKE_ALIAS
, alias
);
803 * devfs_apply_rules is the asynchronous entry point to trigger application
804 * of all rules. It just sends a message with the relevant details to the
808 devfs_apply_rules(char *mntto
)
812 new_name
= kstrdup(mntto
, M_DEVFS
);
813 devfs_msg_send_name(DEVFS_APPLY_RULES
, new_name
);
819 * devfs_reset_rules is the asynchronous entry point to trigger reset of all
820 * rules. It just sends a message with the relevant details to the devfs core.
823 devfs_reset_rules(char *mntto
)
827 new_name
= kstrdup(mntto
, M_DEVFS
);
828 devfs_msg_send_name(DEVFS_RESET_RULES
, new_name
);
835 * devfs_scan_callback is the asynchronous entry point to call a callback
837 * It just sends a message with the relevant details to the devfs core.
840 devfs_scan_callback(devfs_scan_t
*callback
)
844 KKASSERT(sizeof(callback
) == sizeof(void *));
846 msg
= devfs_msg_get();
847 msg
->mdv_load
= callback
;
848 msg
= devfs_msg_send_sync(DEVFS_SCAN_CALLBACK
, msg
);
856 * Acts as a message drain. Any message that is replied to here gets destroyed
857 * and the memory freed.
860 devfs_msg_autofree_reply(lwkt_port_t port
, lwkt_msg_t msg
)
862 devfs_msg_put((devfs_msg_t
)msg
);
866 * devfs_msg_get allocates a new devfs msg and returns it.
871 return objcache_get(devfs_msg_cache
, M_WAITOK
);
875 * devfs_msg_put deallocates a given devfs msg.
878 devfs_msg_put(devfs_msg_t msg
)
880 objcache_put(devfs_msg_cache
, msg
);
885 * devfs_msg_send is the generic asynchronous message sending facility
886 * for devfs. By default the reply port is the automatic disposal port.
888 * If the current thread is the devfs_msg_port thread we execute the
889 * operation synchronously.
892 devfs_msg_send(uint32_t cmd
, devfs_msg_t devfs_msg
)
894 lwkt_port_t port
= &devfs_msg_port
;
896 lwkt_initmsg(&devfs_msg
->hdr
, &devfs_dispose_port
, 0);
898 devfs_msg
->hdr
.u
.ms_result
= cmd
;
900 if (port
->mpu_td
== curthread
) {
901 devfs_msg_exec(devfs_msg
);
902 lwkt_replymsg(&devfs_msg
->hdr
, 0);
904 lwkt_sendmsg(port
, (lwkt_msg_t
)devfs_msg
);
909 * devfs_msg_send_sync is the generic synchronous message sending
910 * facility for devfs. It initializes a local reply port and waits
911 * for the core's answer. This answer is then returned.
914 devfs_msg_send_sync(uint32_t cmd
, devfs_msg_t devfs_msg
)
916 struct lwkt_port rep_port
;
917 devfs_msg_t msg_incoming
;
918 lwkt_port_t port
= &devfs_msg_port
;
920 lwkt_initport_thread(&rep_port
, curthread
);
921 lwkt_initmsg(&devfs_msg
->hdr
, &rep_port
, 0);
923 devfs_msg
->hdr
.u
.ms_result
= cmd
;
925 lwkt_sendmsg(port
, (lwkt_msg_t
)devfs_msg
);
926 msg_incoming
= lwkt_waitport(&rep_port
, 0);
932 * sends a message with a generic argument.
935 devfs_msg_send_generic(uint32_t cmd
, void *load
)
937 devfs_msg_t devfs_msg
= devfs_msg_get();
939 devfs_msg
->mdv_load
= load
;
940 devfs_msg_send(cmd
, devfs_msg
);
944 * sends a message with a name argument.
947 devfs_msg_send_name(uint32_t cmd
, char *name
)
949 devfs_msg_t devfs_msg
= devfs_msg_get();
951 devfs_msg
->mdv_name
= name
;
952 devfs_msg_send(cmd
, devfs_msg
);
956 * sends a message with a mount argument.
959 devfs_msg_send_mount(uint32_t cmd
, struct devfs_mnt_data
*mnt
)
961 devfs_msg_t devfs_msg
= devfs_msg_get();
963 devfs_msg
->mdv_mnt
= mnt
;
964 devfs_msg_send(cmd
, devfs_msg
);
968 * sends a message with an ops argument.
971 devfs_msg_send_ops(uint32_t cmd
, struct dev_ops
*ops
, int minor
)
973 devfs_msg_t devfs_msg
= devfs_msg_get();
975 devfs_msg
->mdv_ops
.ops
= ops
;
976 devfs_msg
->mdv_ops
.minor
= minor
;
977 devfs_msg_send(cmd
, devfs_msg
);
981 * sends a message with a clone handler argument.
984 devfs_msg_send_chandler(uint32_t cmd
, char *name
, d_clone_t handler
)
986 devfs_msg_t devfs_msg
= devfs_msg_get();
988 devfs_msg
->mdv_chandler
.name
= name
;
989 devfs_msg
->mdv_chandler
.nhandler
= handler
;
990 devfs_msg_send(cmd
, devfs_msg
);
994 * sends a message with a device argument.
997 devfs_msg_send_dev(uint32_t cmd
, cdev_t dev
, uid_t uid
, gid_t gid
, int perms
)
999 devfs_msg_t devfs_msg
= devfs_msg_get();
1001 devfs_msg
->mdv_dev
.dev
= dev
;
1002 devfs_msg
->mdv_dev
.uid
= uid
;
1003 devfs_msg
->mdv_dev
.gid
= gid
;
1004 devfs_msg
->mdv_dev
.perms
= perms
;
1006 devfs_msg_send(cmd
, devfs_msg
);
1010 * sends a message with a link argument.
1013 devfs_msg_send_link(uint32_t cmd
, char *name
, char *target
, struct mount
*mp
)
1015 devfs_msg_t devfs_msg
= devfs_msg_get();
1017 devfs_msg
->mdv_link
.name
= name
;
1018 devfs_msg
->mdv_link
.target
= target
;
1019 devfs_msg
->mdv_link
.mp
= mp
;
1020 devfs_msg_send(cmd
, devfs_msg
);
1024 * devfs_msg_core is the main devfs thread. It handles all incoming messages
1025 * and calls the relevant worker functions. By using messages it's assured
1026 * that events occur in the correct order.
1029 devfs_msg_core(void *arg
)
1034 lwkt_initport_thread(&devfs_msg_port
, curthread
);
1038 msg
= (devfs_msg_t
)lwkt_waitport(&devfs_msg_port
, 0);
1039 devfs_debug(DEVFS_DEBUG_DEBUG
,
1040 "devfs_msg_core, new msg: %x\n",
1041 (unsigned int)msg
->hdr
.u
.ms_result
);
1042 devfs_msg_exec(msg
);
1043 lwkt_replymsg(&msg
->hdr
, 0);
1050 devfs_msg_exec(devfs_msg_t msg
)
1052 struct devfs_mnt_data
*mnt
;
1053 struct devfs_node
*node
;
1057 * Acquire the devfs lock to ensure safety of all called functions
1059 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
1061 switch (msg
->hdr
.u
.ms_result
) {
1062 case DEVFS_DEVICE_CREATE
:
1063 dev
= msg
->mdv_dev
.dev
;
1064 devfs_create_dev_worker(dev
,
1067 msg
->mdv_dev
.perms
);
1069 case DEVFS_DEVICE_DESTROY
:
1070 dev
= msg
->mdv_dev
.dev
;
1071 devfs_destroy_dev_worker(dev
);
1073 case DEVFS_DESTROY_SUBNAMES
:
1074 devfs_destroy_subnames_worker(msg
->mdv_load
);
1076 case DEVFS_DESTROY_DEV_BY_OPS
:
1077 devfs_destroy_dev_by_ops_worker(msg
->mdv_ops
.ops
,
1078 msg
->mdv_ops
.minor
);
1080 case DEVFS_CREATE_ALL_DEV
:
1081 node
= (struct devfs_node
*)msg
->mdv_load
;
1082 devfs_create_all_dev_worker(node
);
1084 case DEVFS_MOUNT_ADD
:
1086 TAILQ_INSERT_TAIL(&devfs_mnt_list
, mnt
, link
);
1087 devfs_create_all_dev_worker(mnt
->root_node
);
1089 case DEVFS_MOUNT_DEL
:
1091 TAILQ_REMOVE(&devfs_mnt_list
, mnt
, link
);
1092 devfs_iterate_topology(mnt
->root_node
, devfs_reaperp_callback
,
1094 if (mnt
->leak_count
) {
1095 devfs_debug(DEVFS_DEBUG_SHOW
,
1096 "Leaked %ld devfs_node elements!\n",
1100 case DEVFS_CHANDLER_ADD
:
1101 devfs_chandler_add_worker(msg
->mdv_chandler
.name
,
1102 msg
->mdv_chandler
.nhandler
);
1104 case DEVFS_CHANDLER_DEL
:
1105 devfs_chandler_del_worker(msg
->mdv_chandler
.name
);
1107 case DEVFS_FIND_DEVICE_BY_NAME
:
1108 devfs_find_device_by_name_worker(msg
);
1110 case DEVFS_FIND_DEVICE_BY_UDEV
:
1111 devfs_find_device_by_udev_worker(msg
);
1113 case DEVFS_MAKE_ALIAS
:
1114 devfs_make_alias_worker((struct devfs_alias
*)msg
->mdv_load
);
1116 case DEVFS_APPLY_RULES
:
1117 devfs_apply_reset_rules_caller(msg
->mdv_name
, 1);
1119 case DEVFS_RESET_RULES
:
1120 devfs_apply_reset_rules_caller(msg
->mdv_name
, 0);
1122 case DEVFS_SCAN_CALLBACK
:
1123 devfs_scan_callback_worker((devfs_scan_t
*)msg
->mdv_load
);
1125 case DEVFS_CLR_SUBNAMES_FLAG
:
1126 devfs_clr_subnames_flag_worker(msg
->mdv_flags
.name
,
1127 msg
->mdv_flags
.flag
);
1129 case DEVFS_DESTROY_SUBNAMES_WO_FLAG
:
1130 devfs_destroy_subnames_without_flag_worker(msg
->mdv_flags
.name
,
1131 msg
->mdv_flags
.flag
);
1133 case DEVFS_INODE_TO_VNODE
:
1134 msg
->mdv_ino
.vp
= devfs_iterate_topology(
1135 DEVFS_MNTDATA(msg
->mdv_ino
.mp
)->root_node
,
1136 (devfs_iterate_callback_t
*)devfs_inode_to_vnode_worker_callback
,
1139 case DEVFS_TERMINATE_CORE
:
1145 devfs_debug(DEVFS_DEBUG_WARNING
,
1146 "devfs_msg_core: unknown message "
1147 "received at core\n");
1150 lockmgr(&devfs_lock
, LK_RELEASE
);
1154 * Worker function to insert a new dev into the dev list and initialize its
1155 * permissions. It also calls devfs_propagate_dev which in turn propagates
1156 * the change to all mount points.
1158 * The passed dev is already referenced. This reference is eaten by this
1159 * function and represents the dev's linkage into devfs_dev_list.
1162 devfs_create_dev_worker(cdev_t dev
, uid_t uid
, gid_t gid
, int perms
)
1168 dev
->si_perms
= perms
;
1170 devfs_link_dev(dev
);
1171 devfs_propagate_dev(dev
, 1);
1177 * Worker function to delete a dev from the dev list and free the cdev.
1178 * It also calls devfs_propagate_dev which in turn propagates the change
1179 * to all mount points.
1182 devfs_destroy_dev_worker(cdev_t dev
)
1187 KKASSERT((lockstatus(&devfs_lock
, curthread
)) == LK_EXCLUSIVE
);
1189 error
= devfs_unlink_dev(dev
);
1190 devfs_propagate_dev(dev
, 0);
1192 release_dev(dev
); /* link ref */
1200 * Worker function to destroy all devices with a certain basename.
1201 * Calls devfs_destroy_dev_worker for the actual destruction.
1204 devfs_destroy_subnames_worker(char *name
)
1207 size_t len
= strlen(name
);
1209 TAILQ_FOREACH_MUTABLE(dev
, &devfs_dev_list
, link
, dev1
) {
1210 if ((!strncmp(dev
->si_name
, name
, len
)) &&
1211 (dev
->si_name
[len
] != '\0')) {
1212 devfs_destroy_dev_worker(dev
);
1219 devfs_clr_subnames_flag_worker(char *name
, uint32_t flag
)
1222 size_t len
= strlen(name
);
1224 TAILQ_FOREACH_MUTABLE(dev
, &devfs_dev_list
, link
, dev1
) {
1225 if ((!strncmp(dev
->si_name
, name
, len
)) &&
1226 (dev
->si_name
[len
] != '\0')) {
1227 dev
->si_flags
&= ~flag
;
1235 devfs_destroy_subnames_without_flag_worker(char *name
, uint32_t flag
)
1238 size_t len
= strlen(name
);
1240 TAILQ_FOREACH_MUTABLE(dev
, &devfs_dev_list
, link
, dev1
) {
1241 if ((!strncmp(dev
->si_name
, name
, len
)) &&
1242 (dev
->si_name
[len
] != '\0')) {
1243 if (!(dev
->si_flags
& flag
)) {
1244 devfs_destroy_dev_worker(dev
);
1253 * Worker function that creates all device nodes on top of a devfs
1257 devfs_create_all_dev_worker(struct devfs_node
*root
)
1263 TAILQ_FOREACH(dev
, &devfs_dev_list
, link
) {
1264 devfs_create_device_node(root
, dev
, NULL
, NULL
);
1271 * Worker function that destroys all devices that match a specific
1272 * dev_ops and/or minor. If minor is less than 0, it is not matched
1273 * against. It also propagates all changes.
1276 devfs_destroy_dev_by_ops_worker(struct dev_ops
*ops
, int minor
)
1282 TAILQ_FOREACH_MUTABLE(dev
, &devfs_dev_list
, link
, dev1
) {
1283 if (dev
->si_ops
!= ops
)
1285 if ((minor
< 0) || (dev
->si_uminor
== minor
)) {
1286 devfs_destroy_dev_worker(dev
);
1294 * Worker function that registers a new clone handler in devfs.
1297 devfs_chandler_add_worker(const char *name
, d_clone_t
*nhandler
)
1299 struct devfs_clone_handler
*chandler
= NULL
;
1300 u_char len
= strlen(name
);
1305 TAILQ_FOREACH(chandler
, &devfs_chandler_list
, link
) {
1306 if (chandler
->namlen
!= len
)
1309 if (!memcmp(chandler
->name
, name
, len
)) {
1310 /* Clonable basename already exists */
1315 chandler
= kmalloc(sizeof(*chandler
), M_DEVFS
, M_WAITOK
| M_ZERO
);
1316 chandler
->name
= kstrdup(name
, M_DEVFS
);
1317 chandler
->namlen
= len
;
1318 chandler
->nhandler
= nhandler
;
1320 TAILQ_INSERT_TAIL(&devfs_chandler_list
, chandler
, link
);
1325 * Worker function that removes a given clone handler from the
1326 * clone handler list.
1329 devfs_chandler_del_worker(const char *name
)
1331 struct devfs_clone_handler
*chandler
, *chandler2
;
1332 u_char len
= strlen(name
);
1337 TAILQ_FOREACH_MUTABLE(chandler
, &devfs_chandler_list
, link
, chandler2
) {
1338 if (chandler
->namlen
!= len
)
1340 if (memcmp(chandler
->name
, name
, len
))
1343 TAILQ_REMOVE(&devfs_chandler_list
, chandler
, link
);
1344 kfree(chandler
->name
, M_DEVFS
);
1345 kfree(chandler
, M_DEVFS
);
1353 * Worker function that finds a given device name and changes
1354 * the message received accordingly so that when replied to,
1355 * the answer is returned to the caller.
1358 devfs_find_device_by_name_worker(devfs_msg_t devfs_msg
)
1360 struct devfs_alias
*alias
;
1362 cdev_t found
= NULL
;
1364 TAILQ_FOREACH(dev
, &devfs_dev_list
, link
) {
1365 if (strcmp(devfs_msg
->mdv_name
, dev
->si_name
) == 0) {
1370 if (found
== NULL
) {
1371 TAILQ_FOREACH(alias
, &devfs_alias_list
, link
) {
1372 if (strcmp(devfs_msg
->mdv_name
, alias
->name
) == 0) {
1373 found
= alias
->dev_target
;
1378 devfs_msg
->mdv_cdev
= found
;
1384 * Worker function that finds a given device udev and changes
1385 * the message received accordingly so that when replied to,
1386 * the answer is returned to the caller.
1389 devfs_find_device_by_udev_worker(devfs_msg_t devfs_msg
)
1392 cdev_t found
= NULL
;
1394 TAILQ_FOREACH_MUTABLE(dev
, &devfs_dev_list
, link
, dev1
) {
1395 if (((udev_t
)dev
->si_inode
) == devfs_msg
->mdv_udev
) {
1400 devfs_msg
->mdv_cdev
= found
;
1406 * Worker function that inserts a given alias into the
1407 * alias list, and propagates the alias to all mount
1411 devfs_make_alias_worker(struct devfs_alias
*alias
)
1413 struct devfs_alias
*alias2
;
1414 size_t len
= strlen(alias
->name
);
1417 TAILQ_FOREACH(alias2
, &devfs_alias_list
, link
) {
1418 if (len
!= alias2
->namlen
)
1421 if (!memcmp(alias
->name
, alias2
->name
, len
)) {
1429 * The alias doesn't exist yet, so we add it to the alias list
1431 TAILQ_INSERT_TAIL(&devfs_alias_list
, alias
, link
);
1432 devfs_alias_propagate(alias
);
1434 devfs_debug(DEVFS_DEBUG_WARNING
,
1435 "Warning: duplicate devfs_make_alias for %s\n",
1437 kfree(alias
->name
, M_DEVFS
);
1438 kfree(alias
, M_DEVFS
);
1445 * Function that removes and frees all aliases.
1448 devfs_alias_reap(void)
1450 struct devfs_alias
*alias
, *alias2
;
1452 TAILQ_FOREACH_MUTABLE(alias
, &devfs_alias_list
, link
, alias2
) {
1453 TAILQ_REMOVE(&devfs_alias_list
, alias
, link
);
1454 kfree(alias
, M_DEVFS
);
1460 * Function that removes an alias matching a specific cdev and frees
1464 devfs_alias_remove(cdev_t dev
)
1466 struct devfs_alias
*alias
, *alias2
;
1468 TAILQ_FOREACH_MUTABLE(alias
, &devfs_alias_list
, link
, alias2
) {
1469 if (alias
->dev_target
== dev
) {
1470 TAILQ_REMOVE(&devfs_alias_list
, alias
, link
);
1471 kfree(alias
, M_DEVFS
);
1478 * This function propagates a new alias to all mount points.
1481 devfs_alias_propagate(struct devfs_alias
*alias
)
1483 struct devfs_mnt_data
*mnt
;
1485 TAILQ_FOREACH(mnt
, &devfs_mnt_list
, link
) {
1486 devfs_alias_apply(mnt
->root_node
, alias
);
1492 * This function is a recursive function iterating through
1493 * all device nodes in the topology and, if applicable,
1494 * creating the relevant alias for a device node.
1497 devfs_alias_apply(struct devfs_node
*node
, struct devfs_alias
*alias
)
1499 struct devfs_node
*node1
, *node2
;
1501 KKASSERT(alias
!= NULL
);
1503 if ((node
->node_type
== Proot
) || (node
->node_type
== Pdir
)) {
1504 if (node
->nchildren
> 2) {
1505 TAILQ_FOREACH_MUTABLE(node1
, DEVFS_DENODE_HEAD(node
), link
, node2
) {
1506 devfs_alias_apply(node1
, alias
);
1510 if (node
->d_dev
== alias
->dev_target
)
1511 devfs_alias_create(alias
->name
, node
, 0);
1517 * This function checks if any alias possibly is applicable
1518 * to the given node. If so, the alias is created.
1521 devfs_alias_check_create(struct devfs_node
*node
)
1523 struct devfs_alias
*alias
;
1525 TAILQ_FOREACH(alias
, &devfs_alias_list
, link
) {
1526 if (node
->d_dev
== alias
->dev_target
)
1527 devfs_alias_create(alias
->name
, node
, 0);
1533 * This function creates an alias with a given name
1534 * linking to a given devfs node. It also increments
1535 * the link count on the target node.
1538 devfs_alias_create(char *name_orig
, struct devfs_node
*target
, int rule_based
)
1540 struct mount
*mp
= target
->mp
;
1541 struct devfs_node
*parent
= DEVFS_MNTDATA(mp
)->root_node
;
1542 struct devfs_node
*linknode
;
1543 char *create_path
= NULL
;
1548 KKASSERT((lockstatus(&devfs_lock
, curthread
)) == LK_EXCLUSIVE
);
1550 name_buf
= kmalloc(PATH_MAX
, M_TEMP
, M_WAITOK
);
1551 devfs_resolve_name_path(name_orig
, name_buf
, &create_path
, &name
);
1554 parent
= devfs_resolve_or_create_path(parent
, create_path
, 1);
1557 if (devfs_find_device_node_by_name(parent
, name
)) {
1558 devfs_debug(DEVFS_DEBUG_WARNING
,
1559 "Node already exists: %s "
1560 "(devfs_make_alias_worker)!\n",
1566 linknode
= devfs_allocp(Plink
, name
, parent
, mp
, NULL
);
1567 if (linknode
== NULL
) {
1572 linknode
->link_target
= target
;
1576 linknode
->flags
|= DEVFS_RULE_CREATED
;
1579 kfree(name_buf
, M_TEMP
);
1584 * This function is called by the core and handles mount point
1585 * strings. It either calls the relevant worker (devfs_apply_
1586 * reset_rules_worker) on all mountpoints or only a specific
1590 devfs_apply_reset_rules_caller(char *mountto
, int apply
)
1592 struct devfs_mnt_data
*mnt
;
1594 if (mountto
[0] == '*') {
1595 TAILQ_FOREACH(mnt
, &devfs_mnt_list
, link
) {
1596 devfs_iterate_topology(mnt
->root_node
,
1597 (apply
)?(devfs_rule_check_apply
):(devfs_rule_reset_node
),
1601 TAILQ_FOREACH(mnt
, &devfs_mnt_list
, link
) {
1602 if (!strcmp(mnt
->mp
->mnt_stat
.f_mntonname
, mountto
)) {
1603 devfs_iterate_topology(mnt
->root_node
,
1604 (apply
)?(devfs_rule_check_apply
):(devfs_rule_reset_node
),
1611 kfree(mountto
, M_DEVFS
);
1616 * This function calls a given callback function for
1617 * every dev node in the devfs dev list.
1620 devfs_scan_callback_worker(devfs_scan_t
*callback
)
1624 TAILQ_FOREACH_MUTABLE(dev
, &devfs_dev_list
, link
, dev1
) {
1632 * This function tries to resolve a given directory, or if not
1633 * found and creation requested, creates the given directory.
1635 static struct devfs_node
*
1636 devfs_resolve_or_create_dir(struct devfs_node
*parent
, char *dir_name
,
1637 size_t name_len
, int create
)
1639 struct devfs_node
*node
, *found
= NULL
;
1641 TAILQ_FOREACH(node
, DEVFS_DENODE_HEAD(parent
), link
) {
1642 if (name_len
!= node
->d_dir
.d_namlen
)
1645 if (!memcmp(dir_name
, node
->d_dir
.d_name
, name_len
)) {
1651 if ((found
== NULL
) && (create
)) {
1652 found
= devfs_allocp(Pdir
, dir_name
, parent
, parent
->mp
, NULL
);
1659 * This function tries to resolve a complete path. If creation is requested,
1660 * if a given part of the path cannot be resolved (because it doesn't exist),
1664 devfs_resolve_or_create_path(struct devfs_node
*parent
, char *path
, int create
)
1666 struct devfs_node
*node
= parent
;
1673 buf
= kmalloc(PATH_MAX
, M_TEMP
, M_WAITOK
);
1675 while (*path
&& idx
< PATH_MAX
- 1) {
1680 node
= devfs_resolve_or_create_dir(node
, buf
, idx
, create
);
1690 node
= devfs_resolve_or_create_dir(node
, buf
, idx
, create
);
1691 kfree (buf
, M_TEMP
);
1696 * Takes a full path and strips it into a directory path and a name.
1697 * For a/b/c/foo, it returns foo in namep and a/b/c in pathp. It
1698 * requires a working buffer with enough size to keep the whole
1702 devfs_resolve_name_path(char *fullpath
, char *buf
, char **pathp
, char **namep
)
1706 size_t len
= strlen(fullpath
) + 1;
1709 KKASSERT((fullpath
!= NULL
) && (buf
!= NULL
));
1710 KKASSERT((pathp
!= NULL
) && (namep
!= NULL
));
1712 memcpy(buf
, fullpath
, len
);
1714 for (i
= len
-1; i
>= 0; i
--) {
1715 if (buf
[i
] == '/') {
1735 * This function creates a new devfs node for a given device. It can
1736 * handle a complete path as device name, and accordingly creates
1737 * the path and the final device node.
1739 * The reference count on the passed dev remains unchanged.
1742 devfs_create_device_node(struct devfs_node
*root
, cdev_t dev
,
1743 char *dev_name
, char *path_fmt
, ...)
1745 struct devfs_node
*parent
, *node
= NULL
;
1751 char *create_path
= NULL
;
1752 char *names
= "pqrsPQRS";
1754 name_buf
= kmalloc(PATH_MAX
, M_TEMP
, M_WAITOK
);
1756 if (path_fmt
!= NULL
) {
1757 __va_start(ap
, path_fmt
);
1758 kvasnrprintf(&path
, PATH_MAX
, 10, path_fmt
, ap
);
1762 parent
= devfs_resolve_or_create_path(root
, path
, 1);
1765 devfs_resolve_name_path(
1766 ((dev_name
== NULL
) && (dev
))?(dev
->si_name
):(dev_name
),
1767 name_buf
, &create_path
, &name
);
1770 parent
= devfs_resolve_or_create_path(parent
, create_path
, 1);
1773 if (devfs_find_device_node_by_name(parent
, name
)) {
1774 devfs_debug(DEVFS_DEBUG_WARNING
, "devfs_create_device_node: "
1775 "DEVICE %s ALREADY EXISTS!!! Ignoring creation request.\n", name
);
1779 node
= devfs_allocp(Pdev
, name
, parent
, parent
->mp
, dev
);
1780 nanotime(&parent
->mtime
);
1783 * Ugly unix98 pty magic, to hide pty master (ptm) devices and their
1786 if ((dev
) && (strlen(dev
->si_name
) >= 4) &&
1787 (!memcmp(dev
->si_name
, "ptm/", 4))) {
1788 node
->parent
->flags
|= DEVFS_HIDDEN
;
1789 node
->flags
|= DEVFS_HIDDEN
;
1793 * Ugly pty magic, to tag pty devices as such and hide them if needed.
1795 if ((strlen(name
) >= 3) && (!memcmp(name
, "pty", 3)))
1796 node
->flags
|= (DEVFS_PTY
| DEVFS_INVISIBLE
);
1798 if ((strlen(name
) >= 3) && (!memcmp(name
, "tty", 3))) {
1800 for (i
= 0; i
< strlen(names
); i
++) {
1801 if (name
[3] == names
[i
]) {
1807 node
->flags
|= (DEVFS_PTY
| DEVFS_INVISIBLE
);
1811 kfree(name_buf
, M_TEMP
);
1817 * This function finds a given device node in the topology with a given
1821 devfs_find_device_node_callback(struct devfs_node
*node
, cdev_t target
)
1823 if ((node
->node_type
== Pdev
) && (node
->d_dev
== target
)) {
1831 * This function finds a device node in the given parent directory by its
1832 * name and returns it.
1835 devfs_find_device_node_by_name(struct devfs_node
*parent
, char *target
)
1837 struct devfs_node
*node
, *found
= NULL
;
1838 size_t len
= strlen(target
);
1840 TAILQ_FOREACH(node
, DEVFS_DENODE_HEAD(parent
), link
) {
1841 if (len
!= node
->d_dir
.d_namlen
)
1844 if (!memcmp(node
->d_dir
.d_name
, target
, len
)) {
1854 devfs_inode_to_vnode_worker_callback(struct devfs_node
*node
, ino_t
*inop
)
1856 struct vnode
*vp
= NULL
;
1857 ino_t target
= *inop
;
1859 if (node
->d_dir
.d_ino
== target
) {
1862 vget(vp
, LK_EXCLUSIVE
| LK_RETRY
);
1865 devfs_allocv(&vp
, node
);
1874 * This function takes a cdev and removes its devfs node in the
1875 * given topology. The cdev remains intact.
1878 devfs_destroy_device_node(struct devfs_node
*root
, cdev_t target
)
1880 struct devfs_node
*node
, *parent
;
1883 char *create_path
= NULL
;
1887 name_buf
= kmalloc(PATH_MAX
, M_TEMP
, M_WAITOK
);
1888 ksnprintf(name_buf
, PATH_MAX
, "%s", target
->si_name
);
1890 devfs_resolve_name_path(target
->si_name
, name_buf
, &create_path
, &name
);
1893 parent
= devfs_resolve_or_create_path(root
, create_path
, 0);
1900 node
= devfs_find_device_node_by_name(parent
, name
);
1903 nanotime(&node
->parent
->mtime
);
1906 kfree(name_buf
, M_TEMP
);
1912 * Just set perms and ownership for given node.
1915 devfs_set_perms(struct devfs_node
*node
, uid_t uid
, gid_t gid
,
1916 u_short mode
, u_long flags
)
1926 * Propagates a device attach/detach to all mount
1927 * points. Also takes care of automatic alias removal
1928 * for a deleted cdev.
1931 devfs_propagate_dev(cdev_t dev
, int attach
)
1933 struct devfs_mnt_data
*mnt
;
1935 TAILQ_FOREACH(mnt
, &devfs_mnt_list
, link
) {
1937 /* Device is being attached */
1938 devfs_create_device_node(mnt
->root_node
, dev
,
1941 /* Device is being detached */
1942 devfs_alias_remove(dev
);
1943 devfs_destroy_device_node(mnt
->root_node
, dev
);
1950 * devfs_clone either returns a basename from a complete name by
1951 * returning the length of the name without trailing digits, or,
1952 * if clone != 0, calls the device's clone handler to get a new
1953 * device, which in turn is returned in devp.
1956 devfs_clone(cdev_t dev
, const char *name
, size_t len
, int mode
,
1960 struct devfs_clone_handler
*chandler
;
1961 struct dev_clone_args ap
;
1963 TAILQ_FOREACH(chandler
, &devfs_chandler_list
, link
) {
1964 if (chandler
->namlen
!= len
)
1966 if ((!memcmp(chandler
->name
, name
, len
)) && (chandler
->nhandler
)) {
1967 lockmgr(&devfs_lock
, LK_RELEASE
);
1969 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
1971 ap
.a_head
.a_dev
= dev
;
1977 error
= (chandler
->nhandler
)(&ap
);
1990 * Registers a new orphan in the orphan list.
1993 devfs_tracer_add_orphan(struct devfs_node
*node
)
1995 struct devfs_orphan
*orphan
;
1998 orphan
= kmalloc(sizeof(struct devfs_orphan
), M_DEVFS
, M_WAITOK
);
1999 orphan
->node
= node
;
2001 KKASSERT((node
->flags
& DEVFS_ORPHANED
) == 0);
2002 node
->flags
|= DEVFS_ORPHANED
;
2003 TAILQ_INSERT_TAIL(DEVFS_ORPHANLIST(node
->mp
), orphan
, link
);
2007 * Removes an orphan from the orphan list.
2010 devfs_tracer_del_orphan(struct devfs_node
*node
)
2012 struct devfs_orphan
*orphan
;
2016 TAILQ_FOREACH(orphan
, DEVFS_ORPHANLIST(node
->mp
), link
) {
2017 if (orphan
->node
== node
) {
2018 node
->flags
&= ~DEVFS_ORPHANED
;
2019 TAILQ_REMOVE(DEVFS_ORPHANLIST(node
->mp
), orphan
, link
);
2020 kfree(orphan
, M_DEVFS
);
2027 * Counts the orphans in the orphan list, and if cleanup
2028 * is specified, also frees the orphan and removes it from
2032 devfs_tracer_orphan_count(struct mount
*mp
, int cleanup
)
2034 struct devfs_orphan
*orphan
, *orphan2
;
2037 TAILQ_FOREACH_MUTABLE(orphan
, DEVFS_ORPHANLIST(mp
), link
, orphan2
) {
2040 * If we are instructed to clean up, we do so.
2043 TAILQ_REMOVE(DEVFS_ORPHANLIST(mp
), orphan
, link
);
2044 orphan
->node
->flags
&= ~DEVFS_ORPHANED
;
2045 devfs_freep(orphan
->node
);
2046 kfree(orphan
, M_DEVFS
);
2054 * Fetch an ino_t from the global d_ino by increasing it
2058 devfs_fetch_ino(void)
2062 spin_lock_wr(&ino_lock
);
2064 spin_unlock_wr(&ino_lock
);
2070 * Allocates a new cdev and initializes it's most basic
2074 devfs_new_cdev(struct dev_ops
*ops
, int minor
, struct dev_ops
*bops
)
2076 cdev_t dev
= sysref_alloc(&cdev_sysref_class
);
2078 sysref_activate(&dev
->si_sysref
);
2080 bzero(dev
, offsetof(struct cdev
, si_sysref
));
2085 dev
->si_drv1
= NULL
;
2086 dev
->si_drv2
= NULL
;
2087 dev
->si_lastread
= 0; /* time_second */
2088 dev
->si_lastwrite
= 0; /* time_second */
2093 dev
->si_uminor
= minor
;
2094 dev
->si_bops
= bops
;
2095 /* If there is a backing device, we reference its ops */
2096 dev
->si_inode
= makeudev(
2097 devfs_reference_ops((bops
)?(bops
):(ops
)),
2104 devfs_cdev_terminate(cdev_t dev
)
2108 /* Check if it is locked already. if not, we acquire the devfs lock */
2109 if (!(lockstatus(&devfs_lock
, curthread
)) == LK_EXCLUSIVE
) {
2110 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
2114 /* Propagate destruction, just in case */
2115 devfs_propagate_dev(dev
, 0);
2117 /* If we acquired the lock, we also get rid of it */
2119 lockmgr(&devfs_lock
, LK_RELEASE
);
2121 /* If there is a backing device, we release the backing device's ops */
2122 devfs_release_ops((dev
->si_bops
)?(dev
->si_bops
):(dev
->si_ops
));
2124 /* Finally destroy the device */
2125 sysref_put(&dev
->si_sysref
);
2129 * Links a given cdev into the dev list.
2132 devfs_link_dev(cdev_t dev
)
2134 KKASSERT((dev
->si_flags
& SI_DEVFS_LINKED
) == 0);
2135 dev
->si_flags
|= SI_DEVFS_LINKED
;
2136 TAILQ_INSERT_TAIL(&devfs_dev_list
, dev
, link
);
2142 * Removes a given cdev from the dev list. The caller is responsible for
2143 * releasing the reference on the device associated with the linkage.
2145 * Returns EALREADY if the dev has already been unlinked.
2148 devfs_unlink_dev(cdev_t dev
)
2150 if ((dev
->si_flags
& SI_DEVFS_LINKED
)) {
2151 TAILQ_REMOVE(&devfs_dev_list
, dev
, link
);
2152 dev
->si_flags
&= ~SI_DEVFS_LINKED
;
2159 devfs_node_is_accessible(struct devfs_node
*node
)
2161 if ((node
) && (!(node
->flags
& DEVFS_HIDDEN
)))
2168 devfs_reference_ops(struct dev_ops
*ops
)
2171 struct devfs_dev_ops
*found
= NULL
;
2172 struct devfs_dev_ops
*devops
;
2174 TAILQ_FOREACH(devops
, &devfs_dev_ops_list
, link
) {
2175 if (devops
->ops
== ops
) {
2182 found
= kmalloc(sizeof(struct devfs_dev_ops
), M_DEVFS
, M_WAITOK
);
2184 found
->ref_count
= 0;
2185 TAILQ_INSERT_TAIL(&devfs_dev_ops_list
, found
, link
);
2190 if (found
->ref_count
== 0) {
2191 found
->id
= devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(ops_id
), 255);
2192 if (found
->id
== -1) {
2193 /* Ran out of unique ids */
2194 devfs_debug(DEVFS_DEBUG_WARNING
,
2195 "devfs_reference_ops: WARNING: ran out of unique ids\n");
2205 devfs_release_ops(struct dev_ops
*ops
)
2207 struct devfs_dev_ops
*found
= NULL
;
2208 struct devfs_dev_ops
*devops
;
2210 TAILQ_FOREACH(devops
, &devfs_dev_ops_list
, link
) {
2211 if (devops
->ops
== ops
) {
2221 if (found
->ref_count
== 0) {
2222 TAILQ_REMOVE(&devfs_dev_ops_list
, found
, link
);
2223 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(ops_id
), found
->id
);
2224 kfree(found
, M_DEVFS
);
2233 msg
= devfs_msg_get();
2234 msg
= devfs_msg_send_sync(DEVFS_SYNC
, msg
);
2239 * Called on init of devfs; creates the objcaches and
2240 * spawns off the devfs core thread. Also initializes
2246 devfs_debug(DEVFS_DEBUG_DEBUG
, "devfs_init() called\n");
2247 /* Create objcaches for nodes, msgs and devs */
2248 devfs_node_cache
= objcache_create("devfs-node-cache", 0, 0,
2250 objcache_malloc_alloc
,
2251 objcache_malloc_free
,
2252 &devfs_node_malloc_args
);
2254 devfs_msg_cache
= objcache_create("devfs-msg-cache", 0, 0,
2256 objcache_malloc_alloc
,
2257 objcache_malloc_free
,
2258 &devfs_msg_malloc_args
);
2260 devfs_dev_cache
= objcache_create("devfs-dev-cache", 0, 0,
2262 objcache_malloc_alloc
,
2263 objcache_malloc_free
,
2264 &devfs_dev_malloc_args
);
2266 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(ops_id
));
2268 /* Initialize the reply-only port which acts as a message drain */
2269 lwkt_initport_replyonly(&devfs_dispose_port
, devfs_msg_autofree_reply
);
2271 /* Initialize *THE* devfs lock */
2272 lockinit(&devfs_lock
, "devfs_core lock", 0, 0);
2275 lwkt_create(devfs_msg_core
, /*args*/NULL
, &td_core
, NULL
,
2276 0, 0, "devfs_msg_core");
2278 tsleep(td_core
/*devfs_id*/, 0, "devfsc", 0);
2280 devfs_debug(DEVFS_DEBUG_DEBUG
, "devfs_init finished\n");
2284 * Called on unload of devfs; takes care of destroying the core
2285 * and the objcaches. Also removes aliases that are no longer needed.
2290 devfs_debug(DEVFS_DEBUG_DEBUG
, "devfs_uninit() called\n");
2292 devfs_msg_send(DEVFS_TERMINATE_CORE
, NULL
);
2294 tsleep(td_core
/*devfs_id*/, 0, "devfsc", 0);
2295 tsleep(td_core
/*devfs_id*/, 0, "devfsc", 10000);
2297 devfs_clone_bitmap_uninit(&DEVFS_CLONE_BITMAP(ops_id
));
2299 /* Destroy the objcaches */
2300 objcache_destroy(devfs_msg_cache
);
2301 objcache_destroy(devfs_node_cache
);
2302 objcache_destroy(devfs_dev_cache
);
2308 * This is a sysctl handler to assist userland devname(3) to
2309 * find the device name for a given udev.
2312 devfs_sysctl_devname_helper(SYSCTL_HANDLER_ARGS
)
2319 if ((error
= SYSCTL_IN(req
, &udev
, sizeof(udev_t
))))
2322 devfs_debug(DEVFS_DEBUG_DEBUG
, "devfs sysctl, received udev: %d\n", udev
);
2327 if ((found
= devfs_find_device_by_udev(udev
)) == NULL
)
2330 return(SYSCTL_OUT(req
, found
->si_name
, strlen(found
->si_name
) + 1));
2334 SYSCTL_PROC(_kern
, OID_AUTO
, devname
, CTLTYPE_OPAQUE
|CTLFLAG_RW
|CTLFLAG_ANYBODY
,
2335 NULL
, 0, devfs_sysctl_devname_helper
, "", "helper for devname(3)");
2337 static SYSCTL_NODE(_vfs
, OID_AUTO
, devfs
, CTLFLAG_RW
, 0, "devfs");
2338 TUNABLE_INT("vfs.devfs.debug", &devfs_debug_enable
);
2339 SYSCTL_INT(_vfs_devfs
, OID_AUTO
, debug
, CTLFLAG_RW
, &devfs_debug_enable
,
2340 0, "Enable DevFS debugging");
2342 SYSINIT(vfs_devfs_register
, SI_SUB_PRE_DRIVERS
, SI_ORDER_FIRST
,
2344 SYSUNINIT(vfs_devfs_register
, SI_SUB_PRE_DRIVERS
, SI_ORDER_ANY
,
2345 devfs_uninit
, NULL
);