| /* |
| drbdadm_adjust.c |
| |
| This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
| |
| Copyright (C) 2003-2008, LINBIT Information Technologies GmbH. |
| Copyright (C) 2003-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
| Copyright (C) 2003-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. |
| |
| drbd 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 2, or (at your option) |
| any later version. |
| |
| drbd 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 drbd; see the file COPYING. If not, write to |
| the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #define _GNU_SOURCE |
| |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <ctype.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <stdarg.h> |
| |
| #include "drbdadm.h" |
| #include "drbdtool_common.h" |
| #include "drbdadm_parser.h" |
| |
| /* drbdsetup show might complain that the device minor does |
| not exist at all. Redirect stderr to /dev/null therefore. |
| */ |
| static FILE *m_popen(int *pid,char** argv) |
| { |
| int mpid; |
| int pipes[2]; |
| int dev_null; |
| |
| if(pipe(pipes)) { |
| perror("Creation of pipes failed"); |
| exit(E_EXEC_ERROR); |
| } |
| |
| dev_null = open("/dev/null", O_WRONLY); |
| if (dev_null == -1) { |
| perror("Opening /dev/null failed"); |
| exit(E_EXEC_ERROR); |
| } |
| |
| mpid = fork(); |
| if(mpid == -1) { |
| fprintf(stderr,"Can not fork"); |
| exit(E_EXEC_ERROR); |
| } |
| if(mpid == 0) { |
| close(pipes[0]); // close reading end |
| dup2(pipes[1], fileno(stdout)); |
| close(pipes[1]); |
| dup2(dev_null, fileno(stderr)); |
| close(dev_null); |
| execvp(argv[0],argv); |
| fprintf(stderr,"Can not exec"); |
| exit(E_EXEC_ERROR); |
| } |
| |
| close(pipes[1]); // close writing end |
| close(dev_null); |
| *pid=mpid; |
| return fdopen(pipes[0],"r"); |
| } |
| |
| /* option value equal? */ |
| static int ov_eq(char* val1, char* val2) |
| { |
| unsigned long long v1,v2; |
| |
| if(val1 == NULL && val2 == NULL) return 1; |
| if(val1 == NULL || val2 == NULL) return 0; |
| |
| if(new_strtoll(val1,0,&v1) == MSE_OK && |
| new_strtoll(val2,0,&v2) == MSE_OK) return v1 == v2; |
| |
| return !strcmp(val1,val2); |
| } |
| |
| static int opts_equal(struct d_option* conf, struct d_option* running) |
| { |
| struct d_option* opt; |
| |
| while(running) { |
| if((opt=find_opt(conf,running->name))) { |
| if(!ov_eq(running->value,opt->value)) { |
| /* printf("Value of '%s' differs: r=%s c=%s\n", |
| opt->name,running->value,opt->value); */ |
| return 0; |
| } |
| opt->mentioned=1; |
| } else { |
| if(!running->is_default) { |
| /*printf("Only in running config %s: %s\n", |
| running->name,running->value);*/ |
| return 0; |
| } |
| } |
| running=running->next; |
| } |
| |
| while(conf) { |
| if(conf->mentioned==0) { |
| /*printf("Only in config file %s: %s\n", |
| conf->name,conf->value);*/ |
| return 0; |
| } |
| conf=conf->next; |
| } |
| return 1; |
| } |
| |
| static int addr_equal(struct d_resource* conf, struct d_resource* running) |
| { |
| int equal; |
| |
| if (conf->peer == NULL && running->peer == NULL) return 1; |
| if (running->peer == NULL) return 0; |
| |
| equal = !strcmp(conf->me->address, running->me->address) && |
| !strcmp(conf->me->port, running->me->port) && |
| !strcmp(conf->me->address_family, running->me->address_family); |
| |
| if(conf->me->proxy) |
| equal = equal && |
| !strcmp(conf->me->proxy->inside_addr, running->peer->address) && |
| !strcmp(conf->me->proxy->inside_port, running->peer->port) && |
| !strcmp(conf->me->proxy->inside_af, running->peer->address_family); |
| else |
| equal = equal && conf->peer && |
| !strcmp(conf->peer->address, running->peer->address) && |
| !strcmp(conf->peer->port, running->peer->port) && |
| !strcmp(conf->peer->address_family, running->peer->address_family); |
| |
| return equal; |
| } |
| |
| static int proto_equal(struct d_resource* conf, struct d_resource* running) |
| { |
| if (conf->protocol == NULL && running->protocol == NULL) return 1; |
| if (conf->protocol == NULL || running->protocol == NULL) return 0; |
| |
| return !strcmp(conf->protocol, running->protocol); |
| } |
| |
| /* Are both internal, or are both not internal. */ |
| static int int_eq(char* m_conf, char* m_running) |
| { |
| return !strcmp(m_conf,"internal") == !strcmp(m_running,"internal"); |
| } |
| |
| static int disk_equal(struct d_host_info* conf, struct d_host_info* running) |
| { |
| int eq = 1; |
| |
| if (conf->disk == NULL && running->disk == NULL) return 1; |
| if (conf->disk == NULL || running->disk == NULL) return 0; |
| |
| eq &= !strcmp(conf->disk,running->disk); |
| eq &= int_eq(conf->meta_disk,running->meta_disk); |
| if(!strcmp(conf->meta_disk,"internal")) return eq; |
| eq &= !strcmp(conf->meta_disk,running->meta_disk); |
| |
| return eq; |
| } |
| |
| |
| /* NULL terminated */ |
| static void find_option_in_resources(char *name, |
| struct d_option *list, struct d_option **opt, ...) |
| { |
| va_list va; |
| |
| va_start(va, opt); |
| /* We need to keep setting *opt to NULL, even if a list == NULL. */ |
| while (list || opt) { |
| while (list) { |
| if (strcmp(list->name, name) == 0) |
| break; |
| list = list->next; |
| } |
| |
| *opt = list; |
| |
| list = va_arg(va, struct d_option*); |
| opt = va_arg(va, struct d_option**); |
| } |
| } |
| |
| static int do_proxy_reconf(struct d_resource *res, const char *cmd) |
| { |
| int rv; |
| char *argv[4] = { drbd_proxy_ctl, "-c", (char*)cmd, NULL }; |
| |
| rv = m_system_ex(argv, SLEEPS_SHORT, res->name); |
| return rv; |
| } |
| |
| #define MAX_PLUGINS (10) |
| #define MAX_PLUGIN_NAME (16) |
| |
| /* The new name is appended to the alist. */ |
| int _is_plugin_in_list(char *string, |
| char slist[MAX_PLUGINS][MAX_PLUGIN_NAME], |
| char alist[MAX_PLUGINS][MAX_PLUGIN_NAME], |
| int list_len) |
| { |
| int word_len, i; |
| char *copy; |
| |
| for(word_len=0; string[word_len]; word_len++) |
| if (isspace(string[word_len])) |
| break; |
| |
| if (word_len+1 >= MAX_PLUGIN_NAME) { |
| fprintf(stderr, "Wrong proxy plugin name %*.*s", |
| word_len, word_len, string); |
| exit(E_CONFIG_INVALID); |
| } |
| |
| copy = alist[list_len]; |
| strncpy(copy, string, word_len); |
| copy[word_len] = 0; |
| |
| |
| for(i=0; i<list_len && *slist; i++) { |
| if (strcmp(slist[i], copy) == 0) |
| return 1; |
| } |
| |
| /* Not found, insert into list. */ |
| if (list_len >= MAX_PLUGINS) { |
| fprintf(stderr, "Too many proxy plugins."); |
| exit(E_CONFIG_INVALID); |
| } |
| |
| return 0; |
| } |
| |
| |
| static int proxy_reconf(struct d_resource *res, struct d_resource *running) |
| { |
| int reconn = 0; |
| struct d_option* res_o, *run_o; |
| unsigned long long v1, v2, minimum; |
| char *plugin_changes[MAX_PLUGINS], *cp, *conn_name; |
| /* It's less memory usage when we're storing char[]. malloc overhead for |
| * the few bytes + pointers is much more. */ |
| char p_res[MAX_PLUGINS][MAX_PLUGIN_NAME], |
| p_run[MAX_PLUGINS][MAX_PLUGIN_NAME]; |
| int used, i, re_do; |
| |
| reconn = 0; |
| |
| |
| find_option_in_resources("memlimit", |
| res->proxy_options, &res_o, |
| running->proxy_options, &run_o, |
| NULL, NULL); |
| v1 = res_o ? m_strtoll(res_o->value, 1) : 0; |
| v2 = run_o ? m_strtoll(run_o->value, 1) : 0; |
| minimum = v1 < v2 ? v1 : v2; |
| /* We allow an Ñ” [epsilon] of 2%, so that small (rounding) deviations do |
| * not cause the connection to be re-established. */ |
| if (res_o && |
| (!run_o || abs(v1-v2)/(float)minimum > 0.02)) |
| { |
| redo_whole_conn: |
| /* As the memory is in use while the connection is allocated we have to |
| * completely destroy and rebuild the connection. */ |
| schedule_dcmd( do_proxy_conn_down, res, NULL, 0); |
| schedule_dcmd( do_proxy_conn_up, res, NULL, 1); |
| schedule_dcmd( do_proxy_conn_plugins, res, NULL, 2); |
| |
| /* With connection cleanup and reopen everything is rebuild anyway, and |
| * DRBD will get a reconnect too. */ |
| return 0; |
| } |
| |
| |
| res_o = res->proxy_plugins; |
| run_o = running->proxy_plugins; |
| used = 0; |
| conn_name = proxy_connection_name(res); |
| for(i=0; i<MAX_PLUGINS; i++) |
| { |
| if (used >= sizeof(plugin_changes)-1) { |
| fprintf(stderr, "Too many proxy plugin changes"); |
| exit(E_CONFIG_INVALID); |
| } |
| /* Now we can be sure that we can store another pointer. */ |
| |
| if (!res_o) { |
| if (run_o) { |
| /* More plugins running than configured - just stop here. */ |
| m_asprintf(&cp, "set plugin %s %d end", conn_name, i); |
| plugin_changes[used++] = cp; |
| } |
| else { |
| /* Both at the end? ok, quit loop */ |
| } |
| break; |
| } |
| |
| /* res_o != NULL. */ |
| |
| if (!run_o) { |
| p_run[i][0] = 0; |
| if (_is_plugin_in_list(res_o->name, p_run, p_res, i)) { |
| /* Current plugin was already active, just at another position. |
| * Redo the whole connection. */ |
| goto redo_whole_conn; |
| } |
| |
| /* More configured than running - just add it, if it's not already |
| * somewhere else. */ |
| m_asprintf(&cp, "set plugin %s %d %s", conn_name, i, res_o->name); |
| plugin_changes[used++] = cp; |
| } else { |
| /* If we get here, both lists have been filled in parallel, so we |
| * can simply use the common counter. */ |
| re_do = _is_plugin_in_list(res_o->name, p_run, p_res, i) || |
| _is_plugin_in_list(run_o->name, p_res, p_run, i); |
| if (re_do) { |
| /* Plugin(s) were moved, not simple reconfigured. |
| * Re-do the whole connection. */ |
| goto redo_whole_conn; |
| } |
| |
| /* TODO: We don't (yet) account for possible different ordering of |
| * the parameters to the plugin. |
| * plugin A 1 B 2 |
| * should be treated as equal to |
| * plugin B 2 A 1. */ |
| if (strcmp(run_o->name, res_o->name) != 0) { |
| /* Either a different plugin, or just different settings |
| * - plugin can be overwritten. */ |
| m_asprintf(&cp, "set plugin %s %d %s", conn_name, i, res_o->name); |
| plugin_changes[used++] = cp; |
| } |
| } |
| |
| |
| if (res_o) |
| res_o = res_o->next; |
| if (run_o) |
| run_o = run_o->next; |
| } |
| |
| /* change only a few plugin settings. */ |
| for(i=0; i<used; i++) |
| schedule_dcmd(do_proxy_reconf, res, plugin_changes[i], 2); |
| |
| return reconn; |
| } |
| |
| int need_trigger_kobj_change(struct d_resource *res) |
| { |
| struct stat sbuf; |
| char *link_name; |
| int err; |
| |
| m_asprintf(&link_name, "/dev/drbd/by-res/%s", res->name); |
| |
| err = stat("/dev/drbd/by-res", &sbuf); |
| if (err) /* probably no udev rules in use */ |
| return 0; |
| |
| err = stat(link_name, &sbuf); |
| if (err) |
| /* resource link cannot be stat()ed. */ |
| return 1; |
| |
| /* double check device information */ |
| if (!S_ISBLK(sbuf.st_mode)) |
| return 1; |
| if (major(sbuf.st_rdev) != DRBD_MAJOR) |
| return 1; |
| if (minor(sbuf.st_rdev) != res->me->device_minor) |
| return 1; |
| |
| /* Link exists, and is expected block major:minor. |
| * Do nothing. */ |
| return 0; |
| } |
| |
| /* |
| * CAUTION this modifies global static char * config_file! |
| */ |
| int adm_adjust(struct d_resource* res,char* unused __attribute((unused))) |
| { |
| char* argv[20]; |
| int pid,argc, i; |
| struct d_resource* running; |
| int do_attach=0,do_connect=0,do_syncer=0; |
| int have_disk=0,have_net=0,can_do_proxy=1; |
| char config_file_dummy[250], *conn_name, show_conn[128]; |
| |
| /* disable check_uniq, so it won't interfere |
| * with parsing of drbdsetup show output */ |
| config_valid = 2; |
| |
| |
| /* setup error reporting context for the parsing routines */ |
| line = 1; |
| sprintf(config_file_dummy,"drbdsetup %u show", res->me->device_minor); |
| config_file = config_file_dummy; |
| |
| argc=0; |
| argv[argc++]=drbdsetup; |
| argv[argc++]=res->me->device; |
| argv[argc++]="show"; |
| argv[argc++]=0; |
| |
| /* actually parse drbdsetup show output */ |
| yyin = m_popen(&pid,argv); |
| running = parse_resource(res->name, IgnDiscardMyData); |
| fclose(yyin); |
| |
| waitpid(pid,0,0); |
| /* Sets "me" and "peer" pointer */ |
| post_parse(running, 0); |
| set_peer_in_resource(running, 0); |
| |
| |
| /* Parse proxy settings, if this host has a proxy definition */ |
| if (res->me->proxy) { |
| line = 1; |
| conn_name = proxy_connection_name(res); |
| i=snprintf(show_conn, sizeof(show_conn), "show proxy-settings %s", conn_name); |
| if (i>= sizeof(show_conn)-1) { |
| fprintf(stderr,"connection name too long"); |
| exit(E_THINKO); |
| } |
| sprintf(config_file_dummy,"drbd-proxy-ctl -c '%s'", show_conn); |
| config_file = config_file_dummy; |
| |
| argc=0; |
| argv[argc++]=drbd_proxy_ctl; |
| argv[argc++]="-c"; |
| argv[argc++]=show_conn; |
| argv[argc++]=0; |
| |
| /* actually parse "drbd-proxy-ctl show" output */ |
| yyin = m_popen(&pid,argv); |
| can_do_proxy = !parse_proxy_settings(running, |
| PARSER_CHECK_PROXY_KEYWORD | PARSER_STOP_IF_INVALID); |
| fclose(yyin); |
| |
| waitpid(pid,0,0); |
| } |
| |
| |
| do_attach = !opts_equal(res->disk_options, running->disk_options); |
| if(running->me) { |
| do_attach |= (res->me->device_minor != running->me->device_minor); |
| do_attach |= !disk_equal(res->me, running->me); |
| have_disk = (running->me->disk != NULL); |
| } else do_attach |= 1; |
| |
| do_connect = !opts_equal(res->net_options, running->net_options); |
| do_connect |= !addr_equal(res,running); |
| do_connect |= !proto_equal(res,running); |
| /* No adjust support for drbd proxy version 1. */ |
| if (res->me->proxy && can_do_proxy) |
| do_connect |= proxy_reconf(res,running); |
| have_net = (running->protocol != NULL); |
| |
| do_syncer = !opts_equal(res->sync_options, running->sync_options); |
| |
| /* Special case: nothing changed, but the resource name. |
| * Trigger a no-op syncer request, which will cause a KOBJ_CHANGE |
| * to be broadcast, so udev may pick up the resource name change |
| * and update its symlinks. */ |
| if (!(do_attach || do_syncer || do_connect)) |
| do_syncer = need_trigger_kobj_change(running); |
| |
| if(do_attach) { |
| if(have_disk) schedule_dcmd(adm_generic_s,res,"detach",0); |
| schedule_dcmd(adm_attach,res,"attach",0); |
| } |
| if(do_syncer) schedule_dcmd(adm_syncer,res,"syncer",1); |
| if(do_connect) { |
| if (have_net && res->peer) |
| schedule_dcmd(adm_generic_s,res,"disconnect",0); |
| schedule_dcmd(adm_connect,res,"connect",2); |
| } |
| |
| return 0; |
| } |