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samba-mirror/ctdb/common/ctdb_util.c
Andrew Tridgell c60988325d added support for persistent databases in ctdbd
(This used to be ctdb commit 3115090a0d882beca9d70761130b74bb0821f201)
2007-09-21 12:24:02 +10:00

343 lines
7.4 KiB
C

/*
ctdb utility code
Copyright (C) Andrew Tridgell 2006
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/events/events.h"
#include "lib/tdb/include/tdb.h"
#include "system/network.h"
#include "system/filesys.h"
#include "../include/ctdb_private.h"
int LogLevel;
/*
return error string for last error
*/
const char *ctdb_errstr(struct ctdb_context *ctdb)
{
return ctdb->err_msg;
}
/*
remember an error message
*/
void ctdb_set_error(struct ctdb_context *ctdb, const char *fmt, ...)
{
va_list ap;
talloc_free(ctdb->err_msg);
va_start(ap, fmt);
ctdb->err_msg = talloc_vasprintf(ctdb, fmt, ap);
DEBUG(0,("ctdb error: %s\n", ctdb->err_msg));
va_end(ap);
}
/*
a fatal internal error occurred - no hope for recovery
*/
void ctdb_fatal(struct ctdb_context *ctdb, const char *msg)
{
DEBUG(0,("ctdb fatal error: %s\n", msg));
abort();
}
/*
parse a IP:port pair
*/
int ctdb_parse_address(struct ctdb_context *ctdb,
TALLOC_CTX *mem_ctx, const char *str,
struct ctdb_address *address)
{
struct servent *se;
setservent(0);
se = getservbyname("ctdb", "tcp");
endservent();
address->address = talloc_strdup(mem_ctx, str);
if (se == NULL) {
address->port = CTDB_PORT;
} else {
address->port = ntohs(se->s_port);
}
return 0;
}
/*
check if two addresses are the same
*/
bool ctdb_same_address(struct ctdb_address *a1, struct ctdb_address *a2)
{
return strcmp(a1->address, a2->address) == 0 && a1->port == a2->port;
}
/*
hash function for mapping data to a VNN - taken from tdb
*/
uint32_t ctdb_hash(const TDB_DATA *key)
{
uint32_t value; /* Used to compute the hash value. */
uint32_t i; /* Used to cycle through random values. */
/* Set the initial value from the key size. */
for (value = 0x238F13AF * key->dsize, i=0; i < key->dsize; i++)
value = (value + (key->dptr[i] << (i*5 % 24)));
return (1103515243 * value + 12345);
}
/*
a type checking varient of idr_find
*/
static void *_idr_find_type(struct idr_context *idp, int id, const char *type, const char *location)
{
void *p = idr_find(idp, id);
if (p && talloc_check_name(p, type) == NULL) {
DEBUG(0,("%s idr_find_type expected type %s but got %s\n",
location, type, talloc_get_name(p)));
return NULL;
}
return p;
}
/*
update a max latency number
*/
void ctdb_latency(double *latency, struct timeval t)
{
double l = timeval_elapsed(&t);
if (l > *latency) {
*latency = l;
}
}
uint32_t ctdb_reqid_new(struct ctdb_context *ctdb, void *state)
{
uint32_t id;
id = ctdb->idr_cnt++ & 0xFFFF;
id |= (idr_get_new(ctdb->idr, state, 0xFFFF)<<16);
return id;
}
void *_ctdb_reqid_find(struct ctdb_context *ctdb, uint32_t reqid, const char *type, const char *location)
{
void *p;
p = _idr_find_type(ctdb->idr, (reqid>>16)&0xFFFF, type, location);
if (p == NULL) {
DEBUG(0, ("Could not find idr:%u\n",reqid));
}
return p;
}
void ctdb_reqid_remove(struct ctdb_context *ctdb, uint32_t reqid)
{
int ret;
ret = idr_remove(ctdb->idr, (reqid>>16)&0xFFFF);
if (ret != 0) {
DEBUG(0, ("Removing idr that does not exist\n"));
}
}
/*
form a ctdb_rec_data record from a key/data pair
note that header may be NULL. If not NULL then it is included in the data portion
of the record
*/
struct ctdb_rec_data *ctdb_marshall_record(TALLOC_CTX *mem_ctx, uint32_t reqid,
TDB_DATA key,
struct ctdb_ltdb_header *header,
TDB_DATA data)
{
size_t length;
struct ctdb_rec_data *d;
length = offsetof(struct ctdb_rec_data, data) + key.dsize +
data.dsize + (header?sizeof(*header):0);
d = (struct ctdb_rec_data *)talloc_size(mem_ctx, length);
if (d == NULL) {
return NULL;
}
d->length = length;
d->reqid = reqid;
d->keylen = key.dsize;
memcpy(&d->data[0], key.dptr, key.dsize);
if (header) {
d->datalen = data.dsize + sizeof(*header);
memcpy(&d->data[key.dsize], header, sizeof(*header));
memcpy(&d->data[key.dsize+sizeof(*header)], data.dptr, data.dsize);
} else {
d->datalen = data.dsize;
memcpy(&d->data[key.dsize], data.dptr, data.dsize);
}
return d;
}
#if HAVE_SCHED_H
#include <sched.h>
#endif
/*
if possible, make this task real time
*/
void ctdb_set_scheduler(struct ctdb_context *ctdb)
{
#if HAVE_SCHED_SETSCHEDULER
struct sched_param p;
if (ctdb->saved_scheduler_param == NULL) {
ctdb->saved_scheduler_param = talloc_size(ctdb, sizeof(p));
}
if (sched_getparam(0, (struct sched_param *)ctdb->saved_scheduler_param) == -1) {
DEBUG(0,("Unable to get old scheduler params\n"));
return;
}
p = *(struct sched_param *)ctdb->saved_scheduler_param;
p.sched_priority = 1;
if (sched_setscheduler(0, SCHED_FIFO, &p) == -1) {
DEBUG(0,("Unable to set scheduler to SCHED_FIFO (%s)\n",
strerror(errno)));
} else {
DEBUG(0,("Set scheduler to SCHED_FIFO\n"));
}
#endif
}
/*
restore previous scheduler parameters
*/
void ctdb_restore_scheduler(struct ctdb_context *ctdb)
{
#if HAVE_SCHED_SETSCHEDULER
if (ctdb->saved_scheduler_param == NULL) {
ctdb_fatal(ctdb, "No saved scheduler parameters\n");
}
if (sched_setscheduler(0, SCHED_OTHER, (struct sched_param *)ctdb->saved_scheduler_param) == -1) {
ctdb_fatal(ctdb, "Unable to restore old scheduler parameters\n");
}
#endif
}
void set_nonblocking(int fd)
{
unsigned v;
v = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, v | O_NONBLOCK);
}
void set_close_on_exec(int fd)
{
unsigned v;
v = fcntl(fd, F_GETFD, 0);
fcntl(fd, F_SETFD, v | FD_CLOEXEC);
}
/*
parse a ip:num pair with the given separator
*/
static bool parse_ip_num(const char *s, struct in_addr *addr, unsigned *num, const char sep)
{
const char *p;
char *endp = NULL;
char buf[16];
p = strchr(s, sep);
if (p == NULL) {
return false;
}
if (p - s > 15) {
return false;
}
*num = strtoul(p+1, &endp, 10);
if (endp == NULL || *endp != 0) {
/* trailing garbage */
return false;
}
strlcpy(buf, s, 1+p-s);
if (inet_aton(buf, addr) == 0) {
return false;
}
return true;
}
/*
parse a ip:port pair
*/
bool parse_ip_port(const char *s, struct sockaddr_in *ip)
{
unsigned port;
if (!parse_ip_num(s, &ip->sin_addr, &port, ':')) {
return false;
}
ip->sin_family = AF_INET;
ip->sin_port = htons(port);
return true;
}
/*
parse a ip/mask pair
*/
bool parse_ip_mask(const char *s, struct sockaddr_in *ip, unsigned *mask)
{
if (!parse_ip_num(s, &ip->sin_addr, mask, '/')) {
return false;
}
if (*mask > 32) {
return false;
}
ip->sin_family = AF_INET;
ip->sin_port = 0;
return true;
}
/*
compare two sockaddr_in structures - matching only on IP
*/
bool ctdb_same_ip(const struct sockaddr_in *ip1, const struct sockaddr_in *ip2)
{
return ip1->sin_family == ip2->sin_family &&
ip1->sin_addr.s_addr == ip2->sin_addr.s_addr;
}
/*
compare two sockaddr_in structures
*/
bool ctdb_same_sockaddr(const struct sockaddr_in *ip1, const struct sockaddr_in *ip2)
{
return ctdb_same_ip(ip1, ip2) && ip1->sin_port == ip2->sin_port;
}