HardenedBSD/sys/cam/ctl/ctl_backend.c
Alexander Motin 0c629e2884 Add initial support for CTL module unloading.
It is only a first step and not perfect, but better then nothing.
The main blocker is CAM target frontend, that can not be unloaded,
since CAM does not have mechanism to unregister periph driver now.

MFC after:	2 weeks
2017-01-21 19:38:26 +00:00

232 lines
5.9 KiB
C

/*-
* Copyright (c) 2003 Silicon Graphics International Corp.
* All rights reserved.
*
* 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,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
*
* NO WARRANTY
* 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 MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*
* $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.c#3 $
*/
/*
* CTL backend driver registration routines
*
* Author: Ken Merry <ken@FreeBSD.org>
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_da.h>
#include <cam/ctl/ctl_io.h>
#include <cam/ctl/ctl.h>
#include <cam/ctl/ctl_frontend.h>
#include <cam/ctl/ctl_backend.h>
#include <cam/ctl/ctl_ioctl.h>
#include <cam/ctl/ctl_ha.h>
#include <cam/ctl/ctl_private.h>
#include <cam/ctl/ctl_debug.h>
extern struct ctl_softc *control_softc;
int
ctl_backend_register(struct ctl_backend_driver *be)
{
struct ctl_softc *softc = control_softc;
struct ctl_backend_driver *be_tmp;
int error;
/* Sanity check, make sure this isn't a duplicate registration. */
mtx_lock(&softc->ctl_lock);
STAILQ_FOREACH(be_tmp, &softc->be_list, links) {
if (strcmp(be_tmp->name, be->name) == 0) {
mtx_unlock(&softc->ctl_lock);
return (-1);
}
}
mtx_unlock(&softc->ctl_lock);
#ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED
be->config_move_done = ctl_config_move_done;
#endif
be->num_luns = 0;
/* Call the backend's initialization routine. */
if (be->init != NULL) {
if ((error = be->init()) != 0) {
printf("%s backend init error: %d\n",
be->name, error);
return (error);
}
}
mtx_lock(&softc->ctl_lock);
STAILQ_INSERT_TAIL(&softc->be_list, be, links);
softc->num_backends++;
mtx_unlock(&softc->ctl_lock);
return (0);
}
int
ctl_backend_deregister(struct ctl_backend_driver *be)
{
struct ctl_softc *softc = control_softc;
int error;
/* Call the backend's shutdown routine. */
if (be->shutdown != NULL) {
if ((error = be->shutdown()) != 0) {
printf("%s backend shutdown error: %d\n",
be->name, error);
return (error);
}
}
mtx_lock(&softc->ctl_lock);
STAILQ_REMOVE(&softc->be_list, be, ctl_backend_driver, links);
softc->num_backends--;
mtx_unlock(&softc->ctl_lock);
return (0);
}
struct ctl_backend_driver *
ctl_backend_find(char *backend_name)
{
struct ctl_softc *softc = control_softc;
struct ctl_backend_driver *be_tmp;
mtx_lock(&softc->ctl_lock);
STAILQ_FOREACH(be_tmp, &softc->be_list, links) {
if (strcmp(be_tmp->name, backend_name) == 0) {
mtx_unlock(&softc->ctl_lock);
return (be_tmp);
}
}
mtx_unlock(&softc->ctl_lock);
return (NULL);
}
void
ctl_init_opts(ctl_options_t *opts, int num_args, struct ctl_be_arg *args)
{
struct ctl_option *opt;
int i;
STAILQ_INIT(opts);
for (i = 0; i < num_args; i++) {
if ((args[i].flags & CTL_BEARG_RD) == 0)
continue;
if ((args[i].flags & CTL_BEARG_ASCII) == 0)
continue;
opt = malloc(sizeof(*opt), M_CTL, M_WAITOK);
opt->name = strdup(args[i].kname, M_CTL);
opt->value = strdup(args[i].kvalue, M_CTL);
STAILQ_INSERT_TAIL(opts, opt, links);
}
}
void
ctl_update_opts(ctl_options_t *opts, int num_args, struct ctl_be_arg *args)
{
struct ctl_option *opt;
int i;
for (i = 0; i < num_args; i++) {
if ((args[i].flags & CTL_BEARG_RD) == 0)
continue;
if ((args[i].flags & CTL_BEARG_ASCII) == 0)
continue;
STAILQ_FOREACH(opt, opts, links) {
if (strcmp(opt->name, args[i].kname) == 0)
break;
}
if (args[i].kvalue != NULL &&
((char *)args[i].kvalue)[0] != 0) {
if (opt) {
free(opt->value, M_CTL);
opt->value = strdup(args[i].kvalue, M_CTL);
} else {
opt = malloc(sizeof(*opt), M_CTL, M_WAITOK);
opt->name = strdup(args[i].kname, M_CTL);
opt->value = strdup(args[i].kvalue, M_CTL);
STAILQ_INSERT_TAIL(opts, opt, links);
}
} else if (opt) {
STAILQ_REMOVE(opts, opt, ctl_option, links);
free(opt->name, M_CTL);
free(opt->value, M_CTL);
free(opt, M_CTL);
}
}
}
void
ctl_free_opts(ctl_options_t *opts)
{
struct ctl_option *opt;
while ((opt = STAILQ_FIRST(opts)) != NULL) {
STAILQ_REMOVE_HEAD(opts, links);
free(opt->name, M_CTL);
free(opt->value, M_CTL);
free(opt, M_CTL);
}
}
char *
ctl_get_opt(ctl_options_t *opts, const char *name)
{
struct ctl_option *opt;
STAILQ_FOREACH(opt, opts, links) {
if (strcmp(opt->name, name) == 0) {
return (opt->value);
}
}
return (NULL);
}
int
ctl_get_opt_number(ctl_options_t *opts, const char *name, uint64_t *val)
{
const char *value;
value = ctl_get_opt(opts, name);
if (value == NULL)
return (-2);
return (ctl_expand_number(value, val));
}