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devfs_core.c
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devfs_core.c
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/*
* Copyright (c) 2009 The DragonFly Project. All rights reserved.
*
* This code is derived from software contributed to The DragonFly Project
* by Alex Hornung <ahornung@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of The DragonFly Project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific, prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/types.h>
#include <sys/lock.h>
#include <sys/msgport.h>
#include <sys/sysctl.h>
#include <sys/ucred.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/devfs.h>
#include <sys/devfs_rules.h>
#include <sys/udev.h>
#include <sys/msgport2.h>
#include <sys/spinlock2.h>
#include <sys/mplock2.h>
#include <sys/sysref2.h>
MALLOC_DEFINE(M_DEVFS, "devfs", "Device File System (devfs) allocations");
DEVFS_DECLARE_CLONE_BITMAP(ops_id);
/*
* SYSREF Integration - reference counting, allocation,
* sysid and syslink integration.
*/
static void devfs_cdev_terminate(cdev_t dev);
static void devfs_cdev_lock(cdev_t dev);
static void devfs_cdev_unlock(cdev_t dev);
static struct sysref_class cdev_sysref_class = {
.name = "cdev",
.mtype = M_DEVFS,
.proto = SYSREF_PROTO_DEV,
.offset = offsetof(struct cdev, si_sysref),
.objsize = sizeof(struct cdev),
.nom_cache = 32,
.flags = 0,
.ops = {
.terminate = (sysref_terminate_func_t)devfs_cdev_terminate,
.lock = (sysref_lock_func_t)devfs_cdev_lock,
.unlock = (sysref_unlock_func_t)devfs_cdev_unlock
}
};
static struct objcache *devfs_node_cache;
static struct objcache *devfs_msg_cache;
static struct objcache *devfs_dev_cache;
static struct objcache_malloc_args devfs_node_malloc_args = {
sizeof(struct devfs_node), M_DEVFS };
struct objcache_malloc_args devfs_msg_malloc_args = {
sizeof(struct devfs_msg), M_DEVFS };
struct objcache_malloc_args devfs_dev_malloc_args = {
sizeof(struct cdev), M_DEVFS };
static struct devfs_dev_head devfs_dev_list =
TAILQ_HEAD_INITIALIZER(devfs_dev_list);
static struct devfs_mnt_head devfs_mnt_list =
TAILQ_HEAD_INITIALIZER(devfs_mnt_list);
static struct devfs_chandler_head devfs_chandler_list =
TAILQ_HEAD_INITIALIZER(devfs_chandler_list);
static struct devfs_alias_head devfs_alias_list =
TAILQ_HEAD_INITIALIZER(devfs_alias_list);
static struct devfs_dev_ops_head devfs_dev_ops_list =
TAILQ_HEAD_INITIALIZER(devfs_dev_ops_list);
struct lock devfs_lock;
static struct lwkt_port devfs_dispose_port;
static struct lwkt_port devfs_msg_port;
static struct thread *td_core;
static struct spinlock ino_lock;
static ino_t d_ino;
static int devfs_debug_enable;
static int devfs_run;
static ino_t devfs_fetch_ino(void);
static int devfs_create_all_dev_worker(struct devfs_node *);
static int devfs_create_dev_worker(cdev_t, uid_t, gid_t, int);
static int devfs_destroy_dev_worker(cdev_t);
static int devfs_destroy_related_worker(cdev_t);
static int devfs_destroy_dev_by_ops_worker(struct dev_ops *, int);
static int devfs_propagate_dev(cdev_t, int);
static int devfs_unlink_dev(cdev_t dev);
static void devfs_msg_exec(devfs_msg_t msg);
static int devfs_chandler_add_worker(const char *, d_clone_t *);
static int devfs_chandler_del_worker(const char *);
static void devfs_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
static void devfs_msg_core(void *);
static int devfs_find_device_by_name_worker(devfs_msg_t);
static int devfs_find_device_by_udev_worker(devfs_msg_t);
static int devfs_apply_reset_rules_caller(char *, int);
static int devfs_scan_callback_worker(devfs_scan_t *, void *);
static struct devfs_node *devfs_resolve_or_create_dir(struct devfs_node *,
char *, size_t, int);
static int devfs_make_alias_worker(struct devfs_alias *);
static int devfs_destroy_alias_worker(struct devfs_alias *);
static int devfs_alias_remove(cdev_t);
static int devfs_alias_reap(void);
static int devfs_alias_propagate(struct devfs_alias *, int);
static int devfs_alias_apply(struct devfs_node *, struct devfs_alias *);
static int devfs_alias_check_create(struct devfs_node *);
static int devfs_clr_related_flag_worker(cdev_t, uint32_t);
static int devfs_destroy_related_without_flag_worker(cdev_t, uint32_t);
static void *devfs_reaperp_callback(struct devfs_node *, void *);
static void *devfs_gc_dirs_callback(struct devfs_node *, void *);
static void *devfs_gc_links_callback(struct devfs_node *, struct devfs_node *);
static void *
devfs_inode_to_vnode_worker_callback(struct devfs_node *, ino_t *);
/*
* devfs_debug() is a SYSCTL and TUNABLE controlled debug output function
* using kvprintf
*/
int
devfs_debug(int level, char *fmt, ...)
{
__va_list ap;
__va_start(ap, fmt);
if (level <= devfs_debug_enable)
kvprintf(fmt, ap);
__va_end(ap);
return 0;
}
/*
* devfs_allocp() Allocates a new devfs node with the specified
* parameters. The node is also automatically linked into the topology
* if a parent is specified. It also calls the rule and alias stuff to
* be applied on the new node
*/
struct devfs_node *
devfs_allocp(devfs_nodetype devfsnodetype, char *name,
struct devfs_node *parent, struct mount *mp, cdev_t dev)
{
struct devfs_node *node = NULL;
size_t namlen = strlen(name);
node = objcache_get(devfs_node_cache, M_WAITOK);
bzero(node, sizeof(*node));
atomic_add_long(&DEVFS_MNTDATA(mp)->leak_count, 1);
node->d_dev = NULL;
node->nchildren = 1;
node->mp = mp;
node->d_dir.d_ino = devfs_fetch_ino();
/*
* Cookie jar for children. Leave 0 and 1 for '.' and '..' entries
* respectively.
*/
node->cookie_jar = 2;
/*
* Access Control members
*/
node->mode = DEVFS_DEFAULT_MODE;
node->uid = DEVFS_DEFAULT_UID;
node->gid = DEVFS_DEFAULT_GID;
switch (devfsnodetype) {
case Proot:
/*
* Ensure that we don't recycle the root vnode by marking it as
* linked into the topology.
*/
node->flags |= DEVFS_NODE_LINKED;
case Pdir:
TAILQ_INIT(DEVFS_DENODE_HEAD(node));
node->d_dir.d_type = DT_DIR;
node->nchildren = 2;
break;
case Plink:
node->d_dir.d_type = DT_LNK;
break;
case Preg:
node->d_dir.d_type = DT_REG;
break;
case Pdev:
if (dev != NULL) {
node->d_dir.d_type = DT_CHR;
node->d_dev = dev;
node->mode = dev->si_perms;
node->uid = dev->si_uid;
node->gid = dev->si_gid;
devfs_alias_check_create(node);
}
break;
default:
panic("devfs_allocp: unknown node type");
}
node->v_node = NULL;
node->node_type = devfsnodetype;
/* Initialize the dirent structure of each devfs vnode */
node->d_dir.d_namlen = namlen;
node->d_dir.d_name = kmalloc(namlen+1, M_DEVFS, M_WAITOK);
memcpy(node->d_dir.d_name, name, namlen);
node->d_dir.d_name[namlen] = '\0';
/* Initialize the parent node element */
node->parent = parent;
/* Initialize *time members */
nanotime(&node->atime);
node->mtime = node->ctime = node->atime;
/*
* Associate with parent as last step, clean out namecache
* reference.
*/
if ((parent != NULL) &&
((parent->node_type == Proot) || (parent->node_type == Pdir))) {
parent->nchildren++;
node->cookie = parent->cookie_jar++;
node->flags |= DEVFS_NODE_LINKED;
TAILQ_INSERT_TAIL(DEVFS_DENODE_HEAD(parent), node, link);
/* This forces negative namecache lookups to clear */
++mp->mnt_namecache_gen;
}
/* Apply rules */
devfs_rule_check_apply(node, NULL);
atomic_add_long(&DEVFS_MNTDATA(mp)->file_count, 1);
return node;
}
/*
* devfs_allocv() allocates a new vnode based on a devfs node.
*/
int
devfs_allocv(struct vnode **vpp, struct devfs_node *node)
{
struct vnode *vp;
int error = 0;
KKASSERT(node);
try_again:
while ((vp = node->v_node) != NULL) {
error = vget(vp, LK_EXCLUSIVE);
if (error != ENOENT) {
*vpp = vp;
goto out;
}
}
if ((error = getnewvnode(VT_DEVFS, node->mp, vpp, 0, 0)) != 0)
goto out;
vp = *vpp;
if (node->v_node != NULL) {
vp->v_type = VBAD;
vx_put(vp);
goto try_again;
}
vp->v_data = node;
node->v_node = vp;
switch (node->node_type) {
case Proot:
vsetflags(vp, VROOT);
/* fall through */
case Pdir:
vp->v_type = VDIR;
break;
case Plink:
vp->v_type = VLNK;
break;
case Preg:
vp->v_type = VREG;
break;
case Pdev:
vp->v_type = VCHR;
KKASSERT(node->d_dev);
vp->v_uminor = node->d_dev->si_uminor;
vp->v_umajor = 0;
v_associate_rdev(vp, node->d_dev);
vp->v_ops = &node->mp->mnt_vn_spec_ops;
break;
default:
panic("devfs_allocv: unknown node type");
}
out:
return error;
}
/*
* devfs_allocvp allocates both a devfs node (with the given settings) and a vnode
* based on the newly created devfs node.
*/
int
devfs_allocvp(struct mount *mp, struct vnode **vpp, devfs_nodetype devfsnodetype,
char *name, struct devfs_node *parent, cdev_t dev)
{
struct devfs_node *node;
node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
if (node != NULL)
devfs_allocv(vpp, node);
else
*vpp = NULL;
return 0;
}
/*
* Destroy the devfs_node. The node must be unlinked from the topology.
*
* This function will also destroy any vnode association with the node
* and device.
*
* The cdev_t itself remains intact.
*
* The core lock is not necessarily held on call and must be temporarily
* released if it is to avoid a deadlock.
*/
int
devfs_freep(struct devfs_node *node)
{
struct vnode *vp;
int relock;
KKASSERT(node);
KKASSERT(((node->flags & DEVFS_NODE_LINKED) == 0) ||
(node->node_type == Proot));
/*
* Protect against double frees
*/
KKASSERT((node->flags & DEVFS_DESTROYED) == 0);
node->flags |= DEVFS_DESTROYED;
/*
* Avoid deadlocks between devfs_lock and the vnode lock when
* disassociating the vnode (stress2 pty vs ls -la /dev/pts).
*
* This also prevents the vnode reclaim code from double-freeing
* the node. The vget() is required to safely modified the vp
* and cycle the refs to terminate an inactive vp.
*/
if (lockstatus(&devfs_lock, curthread) == LK_EXCLUSIVE) {
lockmgr(&devfs_lock, LK_RELEASE);
relock = 1;
} else {
relock = 0;
}
while ((vp = node->v_node) != NULL) {
if (vget(vp, LK_EXCLUSIVE | LK_RETRY) != 0)
break;
v_release_rdev(vp);
vp->v_data = NULL;
node->v_node = NULL;
cache_inval_vp(vp, CINV_DESTROY);
vput(vp);
}
/*
* Remaining cleanup
*/
atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->leak_count, 1);
if (node->symlink_name) {
kfree(node->symlink_name, M_DEVFS);
node->symlink_name = NULL;
}
/*
* Remove the node from the orphan list if it is still on it.
*/
if (node->flags & DEVFS_ORPHANED)
devfs_tracer_del_orphan(node);
if (node->d_dir.d_name) {
kfree(node->d_dir.d_name, M_DEVFS);
node->d_dir.d_name = NULL;
}
atomic_subtract_long(&DEVFS_MNTDATA(node->mp)->file_count, 1);
objcache_put(devfs_node_cache, node);
if (relock)
lockmgr(&devfs_lock, LK_EXCLUSIVE);
return 0;
}
/*
* Unlink the devfs node from the topology and add it to the orphan list.
* The node will later be destroyed by freep.
*
* Any vnode association, including the v_rdev and v_data, remains intact
* until the freep.
*/
int
devfs_unlinkp(struct devfs_node *node)
{
struct devfs_node *parent;
KKASSERT(node);
/*
* Add the node to the orphan list, so it is referenced somewhere, to
* so we don't leak it.
*/
devfs_tracer_add_orphan(node);
parent = node->parent;
/*
* If the parent is known we can unlink the node out of the topology
*/
if (parent) {
TAILQ_REMOVE(DEVFS_DENODE_HEAD(parent), node, link);
parent->nchildren--;
node->flags &= ~DEVFS_NODE_LINKED;
}
node->parent = NULL;
return 0;
}
void *
devfs_iterate_topology(struct devfs_node *node,
devfs_iterate_callback_t *callback, void *arg1)
{
struct devfs_node *node1, *node2;
void *ret = NULL;
if ((node->node_type == Proot) || (node->node_type == Pdir)) {
if (node->nchildren > 2) {
TAILQ_FOREACH_MUTABLE(node1, DEVFS_DENODE_HEAD(node),
link, node2) {
if ((ret = devfs_iterate_topology(node1, callback, arg1)))
return ret;
}
}
}
ret = callback(node, arg1);
return ret;
}
/*
* devfs_reaperp() is a recursive function that iterates through all the
* topology, unlinking and freeing all devfs nodes.
*/
static void *
devfs_reaperp_callback(struct devfs_node *node, void *unused)
{
devfs_unlinkp(node);
devfs_freep(node);
return NULL;
}
static void *
devfs_gc_dirs_callback(struct devfs_node *node, void *unused)
{
if (node->node_type == Pdir) {
if ((node->nchildren == 2) &&
!(node->flags & DEVFS_USER_CREATED)) {
devfs_unlinkp(node);
devfs_freep(node);
}
}
return NULL;
}
static void *
devfs_gc_links_callback(struct devfs_node *node, struct devfs_node *target)
{
if ((node->node_type == Plink) && (node->link_target == target)) {
devfs_unlinkp(node);
devfs_freep(node);
}
return NULL;
}
/*
* devfs_gc() is devfs garbage collector. It takes care of unlinking and
* freeing a node, but also removes empty directories and links that link
* via devfs auto-link mechanism to the node being deleted.
*/
int
devfs_gc(struct devfs_node *node)
{
struct devfs_node *root_node = DEVFS_MNTDATA(node->mp)->root_node;
if (node->nlinks > 0)
devfs_iterate_topology(root_node,
(devfs_iterate_callback_t *)devfs_gc_links_callback, node);
devfs_unlinkp(node);
devfs_iterate_topology(root_node,
(devfs_iterate_callback_t *)devfs_gc_dirs_callback, NULL);
devfs_freep(node);
return 0;
}
/*
* devfs_create_dev() is the asynchronous entry point for device creation.
* It just sends a message with the relevant details to the devfs core.
*
* This function will reference the passed device. The reference is owned
* by devfs and represents all of the device's node associations.
*/
int
devfs_create_dev(cdev_t dev, uid_t uid, gid_t gid, int perms)
{
reference_dev(dev);
devfs_msg_send_dev(DEVFS_DEVICE_CREATE, dev, uid, gid, perms);
return 0;
}
/*
* devfs_destroy_dev() is the asynchronous entry point for device destruction.
* It just sends a message with the relevant details to the devfs core.
*/
int
devfs_destroy_dev(cdev_t dev)
{
devfs_msg_send_dev(DEVFS_DEVICE_DESTROY, dev, 0, 0, 0);
return 0;
}
/*
* devfs_mount_add() is the synchronous entry point for adding a new devfs
* mount. It sends a synchronous message with the relevant details to the
* devfs core.
*/
int
devfs_mount_add(struct devfs_mnt_data *mnt)
{
devfs_msg_t msg;
msg = devfs_msg_get();
msg->mdv_mnt = mnt;
msg = devfs_msg_send_sync(DEVFS_MOUNT_ADD, msg);
devfs_msg_put(msg);
return 0;
}
/*
* devfs_mount_del() is the synchronous entry point for removing a devfs mount.
* It sends a synchronous message with the relevant details to the devfs core.
*/
int
devfs_mount_del(struct devfs_mnt_data *mnt)
{
devfs_msg_t msg;
msg = devfs_msg_get();
msg->mdv_mnt = mnt;
msg = devfs_msg_send_sync(DEVFS_MOUNT_DEL, msg);
devfs_msg_put(msg);
return 0;
}
/*
* devfs_destroy_related() is the synchronous entry point for device
* destruction by subname. It just sends a message with the relevant details to
* the devfs core.
*/
int
devfs_destroy_related(cdev_t dev)
{
devfs_msg_t msg;
msg = devfs_msg_get();
msg->mdv_load = dev;
msg = devfs_msg_send_sync(DEVFS_DESTROY_RELATED, msg);
devfs_msg_put(msg);
return 0;
}
int
devfs_clr_related_flag(cdev_t dev, uint32_t flag)
{
devfs_msg_t msg;
msg = devfs_msg_get();
msg->mdv_flags.dev = dev;
msg->mdv_flags.flag = flag;
msg = devfs_msg_send_sync(DEVFS_CLR_RELATED_FLAG, msg);
devfs_msg_put(msg);
return 0;
}
int
devfs_destroy_related_without_flag(cdev_t dev, uint32_t flag)
{
devfs_msg_t msg;
msg = devfs_msg_get();
msg->mdv_flags.dev = dev;
msg->mdv_flags.flag = flag;
msg = devfs_msg_send_sync(DEVFS_DESTROY_RELATED_WO_FLAG, msg);
devfs_msg_put(msg);
return 0;
}
/*
* devfs_create_all_dev is the asynchronous entry point to trigger device
* node creation. It just sends a message with the relevant details to
* the devfs core.
*/
int
devfs_create_all_dev(struct devfs_node *root)
{
devfs_msg_send_generic(DEVFS_CREATE_ALL_DEV, root);
return 0;
}
/*
* devfs_destroy_dev_by_ops is the asynchronous entry point to destroy all
* devices with a specific set of dev_ops and minor. It just sends a
* message with the relevant details to the devfs core.
*/
int
devfs_destroy_dev_by_ops(struct dev_ops *ops, int minor)
{
devfs_msg_send_ops(DEVFS_DESTROY_DEV_BY_OPS, ops, minor);
return 0;
}
/*
* devfs_clone_handler_add is the synchronous entry point to add a new
* clone handler. It just sends a message with the relevant details to
* the devfs core.
*/
int
devfs_clone_handler_add(const char *name, d_clone_t *nhandler)
{
devfs_msg_t msg;
msg = devfs_msg_get();
msg->mdv_chandler.name = name;
msg->mdv_chandler.nhandler = nhandler;
msg = devfs_msg_send_sync(DEVFS_CHANDLER_ADD, msg);
devfs_msg_put(msg);
return 0;
}
/*
* devfs_clone_handler_del is the synchronous entry point to remove a
* clone handler. It just sends a message with the relevant details to
* the devfs core.
*/
int
devfs_clone_handler_del(const char *name)
{
devfs_msg_t msg;
msg = devfs_msg_get();
msg->mdv_chandler.name = name;
msg->mdv_chandler.nhandler = NULL;
msg = devfs_msg_send_sync(DEVFS_CHANDLER_DEL, msg);
devfs_msg_put(msg);
return 0;
}
/*
* devfs_find_device_by_name is the synchronous entry point to find a
* device given its name. It sends a synchronous message with the
* relevant details to the devfs core and returns the answer.
*/
cdev_t
devfs_find_device_by_name(const char *fmt, ...)
{
cdev_t found = NULL;
devfs_msg_t msg;
char *target;
__va_list ap;
if (fmt == NULL)
return NULL;
__va_start(ap, fmt);
kvasnrprintf(&target, PATH_MAX, 10, fmt, ap);
__va_end(ap);
msg = devfs_msg_get();
msg->mdv_name = target;
msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_NAME, msg);
found = msg->mdv_cdev;
devfs_msg_put(msg);
kvasfree(&target);
return found;
}
/*
* devfs_find_device_by_udev is the synchronous entry point to find a
* device given its udev number. It sends a synchronous message with
* the relevant details to the devfs core and returns the answer.
*/
cdev_t
devfs_find_device_by_udev(udev_t udev)
{
cdev_t found = NULL;
devfs_msg_t msg;
msg = devfs_msg_get();
msg->mdv_udev = udev;
msg = devfs_msg_send_sync(DEVFS_FIND_DEVICE_BY_UDEV, msg);
found = msg->mdv_cdev;
devfs_msg_put(msg);
devfs_debug(DEVFS_DEBUG_DEBUG,
"devfs_find_device_by_udev found? %s -end:3-\n",
((found) ? found->si_name:"NO"));
return found;
}
struct vnode *
devfs_inode_to_vnode(struct mount *mp, ino_t target)
{
struct vnode *vp = NULL;
devfs_msg_t msg;
if (mp == NULL)
return NULL;
msg = devfs_msg_get();
msg->mdv_ino.mp = mp;
msg->mdv_ino.ino = target;
msg = devfs_msg_send_sync(DEVFS_INODE_TO_VNODE, msg);
vp = msg->mdv_ino.vp;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
devfs_msg_put(msg);
return vp;
}
/*
* devfs_make_alias is the asynchronous entry point to register an alias
* for a device. It just sends a message with the relevant details to the
* devfs core.
*/
int
devfs_make_alias(const char *name, cdev_t dev_target)
{
struct devfs_alias *alias;
size_t len;
len = strlen(name);
alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
alias->name = kstrdup(name, M_DEVFS);
alias->namlen = len;
alias->dev_target = dev_target;
devfs_msg_send_generic(DEVFS_MAKE_ALIAS, alias);
return 0;
}
/*
* devfs_destroy_alias is the asynchronous entry point to deregister an alias
* for a device. It just sends a message with the relevant details to the
* devfs core.
*/
int
devfs_destroy_alias(const char *name, cdev_t dev_target)
{
struct devfs_alias *alias;
size_t len;
len = strlen(name);
alias = kmalloc(sizeof(struct devfs_alias), M_DEVFS, M_WAITOK);
alias->name = kstrdup(name, M_DEVFS);
alias->namlen = len;
alias->dev_target = dev_target;
devfs_msg_send_generic(DEVFS_DESTROY_ALIAS, alias);
return 0;
}
/*
* devfs_apply_rules is the asynchronous entry point to trigger application
* of all rules. It just sends a message with the relevant details to the
* devfs core.
*/
int
devfs_apply_rules(char *mntto)
{
char *new_name;
new_name = kstrdup(mntto, M_DEVFS);
devfs_msg_send_name(DEVFS_APPLY_RULES, new_name);
return 0;
}
/*
* devfs_reset_rules is the asynchronous entry point to trigger reset of all
* rules. It just sends a message with the relevant details to the devfs core.
*/
int
devfs_reset_rules(char *mntto)
{
char *new_name;
new_name = kstrdup(mntto, M_DEVFS);
devfs_msg_send_name(DEVFS_RESET_RULES, new_name);
return 0;
}
/*
* devfs_scan_callback is the asynchronous entry point to call a callback
* on all cdevs.
* It just sends a message with the relevant details to the devfs core.
*/
int
devfs_scan_callback(devfs_scan_t *callback, void *arg)
{
devfs_msg_t msg;
KKASSERT(sizeof(callback) == sizeof(void *));
msg = devfs_msg_get();
msg->mdv_load = callback;
msg->mdv_load2 = arg;
msg = devfs_msg_send_sync(DEVFS_SCAN_CALLBACK, msg);
devfs_msg_put(msg);
return 0;
}
/*
* Acts as a message drain. Any message that is replied to here gets destroyed
* and the memory freed.
*/
static void
devfs_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
{
devfs_msg_put((devfs_msg_t)msg);
}
/*
* devfs_msg_get allocates a new devfs msg and returns it.
*/
devfs_msg_t
devfs_msg_get(void)
{
return objcache_get(devfs_msg_cache, M_WAITOK);
}
/*
* devfs_msg_put deallocates a given devfs msg.
*/
int
devfs_msg_put(devfs_msg_t msg)
{
objcache_put(devfs_msg_cache, msg);
return 0;
}
/*
* devfs_msg_send is the generic asynchronous message sending facility
* for devfs. By default the reply port is the automatic disposal port.
*
* If the current thread is the devfs_msg_port thread we execute the
* operation synchronously.
*/
void
devfs_msg_send(uint32_t cmd, devfs_msg_t devfs_msg)
{
lwkt_port_t port = &devfs_msg_port;
lwkt_initmsg(&devfs_msg->hdr, &devfs_dispose_port, 0);
devfs_msg->hdr.u.ms_result = cmd;
if (port->mpu_td == curthread) {
devfs_msg_exec(devfs_msg);
lwkt_replymsg(&devfs_msg->hdr, 0);
} else {
lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
}
}
/*
* devfs_msg_send_sync is the generic synchronous message sending
* facility for devfs. It initializes a local reply port and waits
* for the core's answer. This answer is then returned.
*/
devfs_msg_t
devfs_msg_send_sync(uint32_t cmd, devfs_msg_t devfs_msg)
{
struct lwkt_port rep_port;
devfs_msg_t msg_incoming;
lwkt_port_t port = &devfs_msg_port;
lwkt_initport_thread(&rep_port, curthread);
lwkt_initmsg(&devfs_msg->hdr, &rep_port, 0);
devfs_msg->hdr.u.ms_result = cmd;
lwkt_sendmsg(port, (lwkt_msg_t)devfs_msg);
msg_incoming = lwkt_waitport(&rep_port, 0);
return msg_incoming;
}
/*
* sends a message with a generic argument.
*/
void
devfs_msg_send_generic(uint32_t cmd, void *load)
{
devfs_msg_t devfs_msg = devfs_msg_get();
devfs_msg->mdv_load = load;
devfs_msg_send(cmd, devfs_msg);
}
/*
* sends a message with a name argument.
*/
void
devfs_msg_send_name(uint32_t cmd, char *name)
{