diff options
Diffstat (limited to 'source4/cluster/ctdb/common/ctdb_util.c')
| -rw-r--r-- | source4/cluster/ctdb/common/ctdb_util.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/source4/cluster/ctdb/common/ctdb_util.c b/source4/cluster/ctdb/common/ctdb_util.c new file mode 100644 index 0000000000..f11388331d --- /dev/null +++ b/source4/cluster/ctdb/common/ctdb_util.c @@ -0,0 +1,285 @@ +/* + 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 +*/ +_NORETURN_ 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 + */ +struct ctdb_rec_data *ctdb_marshall_record(TALLOC_CTX *mem_ctx, uint32_t reqid, TDB_DATA key, TDB_DATA data) +{ + size_t length; + struct ctdb_rec_data *d; + + length = offsetof(struct ctdb_rec_data, data) + key.dsize + data.dsize; + 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; + d->datalen = data.dsize; + memcpy(&d->data[0], key.dptr, key.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:port pair + */ +bool parse_ip_port(const char *s, struct sockaddr_in *ip) +{ + const char *p; + char *endp = NULL; + unsigned port; + char buf[16]; + + ip->sin_family = AF_INET; + + p = strchr(s, ':'); + if (p == NULL) { + return false; + } + + if (p - s > 15) { + return false; + } + + port = strtoul(p+1, &endp, 10); + if (endp == NULL || *endp != 0) { + /* trailing garbage */ + return false; + } + ip->sin_port = htons(port); + + strlcpy(buf, s, 1+p-s); + + if (inet_aton(buf, &ip->sin_addr) == 0) { + return false; + } + + return true; +} |