OpenSolaris_b135/lib/libdiskmgt/common/inuse_svm.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Creates and maintains a cache of slices used by SVM.
*/
#include <meta.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <libintl.h>
#include <synch.h>
#include <thread.h>
#include <dlfcn.h>
#include <link.h>
#include <libsysevent.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/sysevent/eventdefs.h>
#include "libdiskmgt.h"
#include "disks_private.h"
/*
* The list of SVM slices in use.
*/
struct svm_list {
struct svm_list *next;
char *slice;
char *name;
char *type;
};
static struct svm_list *svm_listp = NULL;
static rwlock_t svm_lock = DEFAULTRWLOCK;
static int initialized = 0;
static mutex_t init_lock = DEFAULTMUTEX;
static int add_use_record(char *devname, char *type, char *mname);
static int diskset_info(mdsetname_t *sp);
static int drive_in_diskset(char *dpath, char *setname);
static void event_handler();
static void free_names(mdnamelist_t *nlp);
static void free_svm(struct svm_list *listp);
static int init_svm();
static int load_svm();
static int new_entry(char *sname, char *type, char *mname,
mdsetname_t *sp);
/*
* Pointers to libmeta functions that we dynamically resolve.
*/
static set_t (*mdl_get_max_sets)(md_error_t *ep);
static void (*mdl_mdclrerror)(md_error_t *ep);
static md_error_t *mdl_mdnullerror;
static void (*mdl_metaflushnames)(int flush_sr_cache);
static void (*mdl_metaflushsetname)(mdsetname_t *sp);
static void (*mdl_metafreenamelist)(mdnamelist_t *nlp);
static void (*mdl_metafreereplicalist)(md_replicalist_t *rlp);
static md_drive_desc *(*mdl_metaget_drivedesc)(mdsetname_t *sp, int flags,
md_error_t *ep);
static mdname_t *(*mdl_metaname)(mdsetname_t **spp, char *uname,
meta_device_type_t uname_type, md_error_t *ep);
static int (*mdl_metareplicalist)(mdsetname_t *sp, int flags,
md_replicalist_t **rlpp, md_error_t *ep);
static mdsetname_t *(*mdl_metasetnosetname)(set_t setno, md_error_t *ep);
static int (*mdl_meta_get_hotspare_names)(mdsetname_t *sp,
mdnamelist_t **nlpp, int options, md_error_t *ep);
static md_raid_t *(*mdl_meta_get_raid)(mdsetname_t *sp, mdname_t *raidnp,
md_error_t *ep);
static int (*mdl_meta_get_raid_names)(mdsetname_t *sp,
mdnamelist_t **nlpp, int options, md_error_t *ep);
static md_sp_t *(*mdl_meta_get_sp)(mdsetname_t *sp, mdname_t *np,
md_error_t *ep);
static int (*mdl_meta_get_sp_names)(mdsetname_t *sp,
mdnamelist_t **nlpp, int options, md_error_t *ep);
static md_stripe_t *(*mdl_meta_get_stripe)(mdsetname_t *sp,
mdname_t *stripenp, md_error_t *ep);
static int (*mdl_meta_get_stripe_names)(mdsetname_t *sp,
mdnamelist_t **nlpp, int options, md_error_t *ep);
static int (*mdl_meta_get_trans_names)(mdsetname_t *sp,
mdnamelist_t **nlpp, int options, md_error_t *ep);
static void (*mdl_meta_invalidate_name)(mdname_t *np);
static void (*mdl_sdssc_bind_library)();
/*
* Search the list of devices under SVM for the specified device.
*/
int
inuse_svm(char *slice, nvlist_t *attrs, int *errp)
{
struct svm_list *listp;
int found = 0;
*errp = 0;
if (slice == NULL) {
return (found);
}
(void) mutex_lock(&init_lock);
if (!initialized) {
/* dynamically load libmeta */
if (init_svm()) {
/*
* need to initialize the cluster library to
* avoid seg faults
*/
(mdl_sdssc_bind_library)();
/* load the SVM cache */
*errp = load_svm();
if (*errp == 0) {
/* start a thread to monitor the svm config */
sysevent_handle_t *shp;
const char *subclass_list[1];
/*
* Only start the svmevent thread if
* we are not doing an install
*/
if (getenv("_LIBDISKMGT_INSTALL") == NULL) {
shp = sysevent_bind_handle(
event_handler);
if (shp != NULL) {
subclass_list[0] = EC_SUB_ALL;
if (sysevent_subscribe_event(
shp, EC_SVM_CONFIG,
subclass_list, 1) != 0) {
*errp = errno;
}
} else {
*errp = errno;
}
if (*errp) {
/*
* If the sysevent thread fails,
* log the error but continue
* on. This failing to start
* is not catastrophic in
* particular for short lived
* consumers of libdiskmgt.
*/
syslog(LOG_WARNING,
dgettext(TEXT_DOMAIN,
"libdiskmgt: sysevent "
"thread for SVM failed "
"to start\n"));
*errp = 0;
}
}
}
}
if (*errp == 0) {
initialized = 1;
}
}
(void) mutex_unlock(&init_lock);
(void) rw_rdlock(&svm_lock);
listp = svm_listp;
while (listp != NULL) {
if (strcmp(slice, listp->slice) == 0) {
libdiskmgt_add_str(attrs, DM_USED_BY, DM_USE_SVM, errp);
if (strcmp(listp->type, "mdb") == 0 ||
strcmp(listp->type, "hs") == 0) {
libdiskmgt_add_str(attrs, DM_USED_NAME, listp->type, errp);
} else {
char name[MAXPATHLEN];
(void) snprintf(name, MAXPATHLEN, "%s:%s", listp->type,
listp->name);
libdiskmgt_add_str(attrs, DM_USED_NAME, name, errp);
}
found = 1;
break;
}
listp = listp->next;
}
(void) rw_unlock(&svm_lock);
return (found);
}
static int
add_use_record(char *devname, char *type, char *mname)
{
struct svm_list *sp;
/* If prev. record is a dup, skip it. */
if (svm_listp != NULL && strcmp(svm_listp->slice, devname) == 0 &&
strcmp(svm_listp->type, type) == 0) {
return (0);
}
sp = (struct svm_list *)malloc(sizeof (struct svm_list));
if (sp == NULL) {
return (ENOMEM);
}
if ((sp->slice = strdup(devname)) == NULL) {
free(sp);
return (ENOMEM);
}
if ((sp->name = strdup(mname)) == NULL) {
free(sp->slice);
free(sp);
return (ENOMEM);
}
if ((sp->type = strdup(type)) == NULL) {
free(sp->slice);
free(sp->name);
free(sp);
return (ENOMEM);
}
sp->next = svm_listp;
svm_listp = sp;
return (0);
}
static int
diskset_info(mdsetname_t *sp)
{
md_error_t error = *mdl_mdnullerror;
md_replicalist_t *replica_list = NULL;
mdnamelist_t *trans_list = NULL;
mdnamelist_t *raid_list = NULL;
mdnamelist_t *stripe_list = NULL;
mdnamelist_t *sp_list = NULL;
mdnamelist_t *spare_list = NULL;
if ((mdl_metareplicalist)(sp, MD_BASICNAME_OK, &replica_list, &error)
>= 0) {
md_replicalist_t *nlp;
for (nlp = replica_list; nlp != NULL; nlp = nlp->rl_next) {
if (new_entry(nlp->rl_repp->r_namep->bname, "mdb",
nlp->rl_repp->r_namep->cname, sp)) {
(mdl_metafreereplicalist)(replica_list);
return (ENOMEM);
}
}
(mdl_metafreereplicalist)(replica_list);
} else {
(mdl_mdclrerror)(&error);
/* there are no metadb's; that is ok, no need to check the rest */
return (0);
}
(mdl_mdclrerror)(&error);
if ((mdl_meta_get_trans_names)(sp, &trans_list, 0, &error) >= 0) {
mdnamelist_t *nlp;
for (nlp = trans_list; nlp != NULL; nlp = nlp->next) {
if (new_entry(nlp->namep->bname, "trans", nlp->namep->cname,
sp)) {
free_names(trans_list);
return (ENOMEM);
}
}
free_names(trans_list);
}
(mdl_mdclrerror)(&error);
if ((mdl_meta_get_raid_names)(sp, &raid_list, 0, &error) >= 0) {
mdnamelist_t *nlp;
for (nlp = raid_list; nlp != NULL; nlp = nlp->next) {
mdname_t *mdn;
md_raid_t *raid;
mdn = (mdl_metaname)(&sp, nlp->namep->cname,
META_DEVICE, &error);
(mdl_mdclrerror)(&error);
if (mdn == NULL) {
continue;
}
raid = (mdl_meta_get_raid)(sp, mdn, &error);
(mdl_mdclrerror)(&error);
if (raid != NULL) {
int i;
for (i = 0; i < raid->cols.cols_len; i++) {
if (new_entry(raid->cols.cols_val[i].colnamep->bname,
"raid", nlp->namep->cname, sp)) {
free_names(raid_list);
return (ENOMEM);
}
}
}
}
free_names(raid_list);
}
(mdl_mdclrerror)(&error);
if ((mdl_meta_get_stripe_names)(sp, &stripe_list, 0, &error) >= 0) {
mdnamelist_t *nlp;
for (nlp = stripe_list; nlp != NULL; nlp = nlp->next) {
mdname_t *mdn;
md_stripe_t *stripe;
mdn = (mdl_metaname)(&sp, nlp->namep->cname,
META_DEVICE, &error);
(mdl_mdclrerror)(&error);
if (mdn == NULL) {
continue;
}
stripe = (mdl_meta_get_stripe)(sp, mdn, &error);
(mdl_mdclrerror)(&error);
if (stripe != NULL) {
int i;
for (i = 0; i < stripe->rows.rows_len; i++) {
md_row_t *rowp;
int j;
rowp = &stripe->rows.rows_val[i];
for (j = 0; j < rowp->comps.comps_len; j++) {
md_comp_t *component;
component = &rowp->comps.comps_val[j];
if (new_entry(component->compnamep->bname, "stripe",
nlp->namep->cname, sp)) {
free_names(stripe_list);
return (ENOMEM);
}
}
}
}
}
free_names(stripe_list);
}
(mdl_mdclrerror)(&error);
if ((mdl_meta_get_sp_names)(sp, &sp_list, 0, &error) >= 0) {
mdnamelist_t *nlp;
for (nlp = sp_list; nlp != NULL; nlp = nlp->next) {
mdname_t *mdn;
md_sp_t *soft_part;
mdn = (mdl_metaname)(&sp, nlp->namep->cname,
META_DEVICE, &error);
(mdl_mdclrerror)(&error);
if (mdn == NULL) {
continue;
}
soft_part = (mdl_meta_get_sp)(sp, mdn, &error);
(mdl_mdclrerror)(&error);
if (soft_part != NULL) {
if (new_entry(soft_part->compnamep->bname, "sp",
nlp->namep->cname, sp)) {
free_names(sp_list);
return (ENOMEM);
}
}
}
free_names(sp_list);
}
(mdl_mdclrerror)(&error);
if ((mdl_meta_get_hotspare_names)(sp, &spare_list, 0, &error) >= 0) {
mdnamelist_t *nlp;
for (nlp = spare_list; nlp != NULL; nlp = nlp->next) {
if (new_entry(nlp->namep->bname, "hs", nlp->namep->cname, sp)) {
free_names(spare_list);
return (ENOMEM);
}
}
free_names(spare_list);
}
(mdl_mdclrerror)(&error);
return (0);
}
/*
* SVM uses "drive names" (ctd name without trailing slice) for drives
* in disksets. Since it massages these names there is no direct correspondence
* with the slice device names in /dev. So, we need to massage these names
* back to something we can match on when a slice comes in. We create an
* entry for each possible slice since we don't know what slices actually
* exist. Slice 0 & 7 are probably enough, but the user could have
* repartitioned the drive after they added it to the diskset and removed the
* mdb.
*/
static int
drive_in_diskset(char *dpath, char *setname)
{
int i;
char path[MAXPATHLEN];
(void) strlcpy(path, dpath, sizeof (path));
if (strncmp(path, "/dev/rdsk/", 10) == 0) {
/* change rdsk to dsk */
char *p;
/* start p pointing to r in rdsk */
for (p = path + 5; *p; p++) {
*p = *(p + 1);
}
} else if (strncmp(path, "/dev/did/rdsk/", 14) == 0) {
/* change rdsk to dsk */
char *p;
/* start p pointing to r in rdsk */
for (p = path + 9; *p; p++) {
*p = *(p + 1);
}
}
for (i = 0; i < 8; i++) {
char slice[MAXPATHLEN];
(void) snprintf(slice, sizeof (slice), "%ss%d", path, i);
if (add_use_record(slice, "diskset", setname)) {
return (ENOMEM);
}
}
return (0);
}
static void
event_handler()
{
(void) rw_wrlock(&svm_lock);
free_svm(svm_listp);
svm_listp = NULL;
(mdl_metaflushnames)(0);
(void) load_svm();
(void) rw_unlock(&svm_lock);
}
static void
free_names(mdnamelist_t *nlp)
{
mdnamelist_t *p;
for (p = nlp; p != NULL; p = p->next) {
(mdl_meta_invalidate_name)(p->namep);
p->namep = NULL;
}
(mdl_metafreenamelist)(nlp);
}
/*
* Free the list of SVM entries.
*/
static void
free_svm(struct svm_list *listp) {
struct svm_list *nextp;
while (listp != NULL) {
nextp = listp->next;
free((void *)listp->slice);
free((void *)listp->name);
free((void *)listp->type);
free((void *)listp);
listp = nextp;
}
}
/*
* Try to dynamically link the libmeta functions we need.
*/
static int
init_svm()
{
void *lh;
if ((lh = dlopen("/usr/lib/libmeta.so", RTLD_NOW)) == NULL) {
return (0);
}
mdl_get_max_sets = (set_t (*)(md_error_t *))dlsym(lh, "get_max_sets");
mdl_mdclrerror = (void(*)(md_error_t *))dlsym(lh, "mdclrerror");
mdl_mdnullerror = (md_error_t *)dlsym(lh, "mdnullerror");
mdl_metaflushnames = (void (*)(int))dlsym(lh, "metaflushnames");
mdl_metaflushsetname = (void (*)(mdsetname_t *))dlsym(lh,
"metaflushsetname");
mdl_metafreenamelist = (void (*)(mdnamelist_t *))dlsym(lh,
"metafreenamelist");
mdl_metafreereplicalist = (void (*)(md_replicalist_t *))dlsym(lh,
"metafreereplicalist");
mdl_metaget_drivedesc = (md_drive_desc *(*)(mdsetname_t *, int,
md_error_t *))dlsym(lh, "metaget_drivedesc");
mdl_metaname = (mdname_t *(*)(mdsetname_t **, char *,
meta_device_type_t, md_error_t *))dlsym(lh, "metaname");
mdl_metareplicalist = (int (*)(mdsetname_t *, int, md_replicalist_t **,
md_error_t *))dlsym(lh, "metareplicalist");
mdl_metasetnosetname = (mdsetname_t *(*)(set_t, md_error_t *))dlsym(lh,
"metasetnosetname");
mdl_meta_get_hotspare_names = (int (*)(mdsetname_t *, mdnamelist_t **,
int, md_error_t *))dlsym(lh, "meta_get_hotspare_names");
mdl_meta_get_raid = (md_raid_t *(*)(mdsetname_t *, mdname_t *,
md_error_t *))dlsym(lh, "meta_get_raid");
mdl_meta_get_raid_names = (int (*)(mdsetname_t *, mdnamelist_t **,
int, md_error_t *))dlsym(lh, "meta_get_raid_names");
mdl_meta_get_sp = (md_sp_t *(*)(mdsetname_t *, mdname_t *,
md_error_t *))dlsym(lh, "meta_get_sp");
mdl_meta_get_sp_names = (int (*)(mdsetname_t *, mdnamelist_t **,
int, md_error_t *))dlsym(lh, "meta_get_sp_names");
mdl_meta_get_stripe = (md_stripe_t *(*)(mdsetname_t *, mdname_t *,
md_error_t *))dlsym(lh, "meta_get_stripe");
mdl_meta_get_stripe_names = (int (*)(mdsetname_t *, mdnamelist_t **,
int, md_error_t *))dlsym(lh, "meta_get_stripe_names");
mdl_meta_get_trans_names = (int (*)(mdsetname_t *, mdnamelist_t **,
int, md_error_t *))dlsym(lh, "meta_get_trans_names");
mdl_meta_invalidate_name = (void (*)(mdname_t *))dlsym(lh,
"meta_invalidate_name");
mdl_sdssc_bind_library = (void (*)())dlsym(lh, "sdssc_bind_library");
return (1);
}
/*
* Create a list of SVM devices
*/
static int
load_svm()
{
int max_sets;
md_error_t error = *mdl_mdnullerror;
int i;
if ((max_sets = (mdl_get_max_sets)(&error)) == 0) {
return (0);
}
if (!mdisok(&error)) {
(mdl_mdclrerror)(&error);
return (0);
}
/* for each possible set number, see if we really have a diskset */
for (i = 0; i < max_sets; i++) {
mdsetname_t *sp;
if ((sp = (mdl_metasetnosetname)(i, &error)) == NULL) {
if (!mdisok(&error) &&
mdisrpcerror(&error, RPC_PROGNOTREGISTERED)) {
/* metad rpc program not registered - no metasets */
break;
}
(mdl_mdclrerror)(&error);
continue;
}
(mdl_mdclrerror)(&error);
/* pick up drives in disksets with no mdbs/metadevices */
if (sp->setno != 0) {
md_drive_desc *dd;
dd = (mdl_metaget_drivedesc)(sp, MD_BASICNAME_OK | PRINT_FAST,
&error);
(mdl_mdclrerror)(&error);
for (; dd != NULL; dd = dd->dd_next) {
if (drive_in_diskset(dd->dd_dnp->rname, sp->setname)) {
(mdl_metaflushsetname)(sp);
return (ENOMEM);
}
}
}
if (diskset_info(sp)) {
(mdl_metaflushsetname)(sp);
return (ENOMEM);
}
(mdl_metaflushsetname)(sp);
}
(mdl_mdclrerror)(&error);
return (0);
}
static int
new_entry(char *sname, char *type, char *mname, mdsetname_t *sp)
{
mdname_t *mdn;
md_error_t error = *mdl_mdnullerror;
mdn = (mdl_metaname)(&sp, sname, UNKNOWN, &error);
if (!mdisok(&error)) {
(mdl_mdclrerror)(&error);
return (0);
}
if (mdn != NULL && (
mdn->drivenamep->type == MDT_ACCES ||
mdn->drivenamep->type == MDT_COMP ||
mdn->drivenamep->type == MDT_FAST_COMP)) {
return (add_use_record(mdn->bname, type, mname));
}
return (0);
}