mirror of
git://sourceware.org/git/lvm2.git
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282 lines
7.2 KiB
C
282 lines
7.2 KiB
C
/*
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* Copyright (C) 2005 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "libdevmapper.h"
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#include "libdevmapper-event.h"
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#include "lvm2cmd.h"
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <syslog.h> /* FIXME Replace syslog with multilog */
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/* FIXME Missing openlog? */
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#define ME_IGNORE 0
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#define ME_INSYNC 1
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#define ME_FAILURE 2
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/*
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* register_device() is called first and performs initialisation.
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* Only one device may be registered or unregistered at a time.
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*/
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static pthread_mutex_t _register_mutex = PTHREAD_MUTEX_INITIALIZER;
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/*
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* Number of active registrations.
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*/
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static int _register_count = 0;
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static struct dm_pool *_mem_pool = NULL;
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static void *_lvm_handle = NULL;
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/*
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* Currently only one event can be processed at a time.
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*/
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static pthread_mutex_t _event_mutex = PTHREAD_MUTEX_INITIALIZER;
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static int _get_mirror_event(char *params)
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{
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int i, r = ME_INSYNC;
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char **args = NULL;
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char *dev_status_str;
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char *log_status_str;
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char *sync_str;
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char *p = NULL;
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int log_argc, num_devs;
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/*
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* dm core parms: 0 409600 mirror
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* Mirror core parms: 2 253:4 253:5 400/400
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* New-style failure params: 1 AA
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* New-style log params: 3 cluster 253:3 A
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* or 3 disk 253:3 A
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* or 1 core
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*/
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/* number of devices */
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if (!dm_split_words(params, 1, 0, &p))
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goto out_parse;
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if (!(num_devs = atoi(p)))
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goto out_parse;
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p += strlen(p) + 1;
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/* devices names + "400/400" + "1 AA" + 1 or 3 log parms + NULL */
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args = dm_malloc((num_devs + 7) * sizeof(char *));
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if (!args || dm_split_words(p, num_devs + 7, 0, args) < num_devs + 5)
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goto out_parse;
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dev_status_str = args[2 + num_devs];
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log_argc = atoi(args[3 + num_devs]);
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log_status_str = args[3 + num_devs + log_argc];
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sync_str = args[num_devs];
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/* Check for bad mirror devices */
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for (i = 0; i < num_devs; i++)
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if (dev_status_str[i] == 'D') {
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syslog(LOG_ERR, "Mirror device, %s, has failed.\n", args[i]);
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r = ME_FAILURE;
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}
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/* Check for bad disk log device */
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if (log_argc > 1 && log_status_str[0] == 'D') {
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syslog(LOG_ERR, "Log device, %s, has failed.\n",
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args[2 + num_devs + log_argc]);
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r = ME_FAILURE;
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}
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if (r == ME_FAILURE)
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goto out;
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p = strstr(sync_str, "/");
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if (p) {
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p[0] = '\0';
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if (strcmp(sync_str, p+1))
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r = ME_IGNORE;
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p[0] = '/';
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} else
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goto out_parse;
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out:
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if (args)
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dm_free(args);
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return r;
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out_parse:
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if (args)
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dm_free(args);
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syslog(LOG_ERR, "Unable to parse mirror status string.");
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return ME_IGNORE;
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}
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static void _temporary_log_fn(int level, const char *file,
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int line, const char *format)
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{
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if (!strncmp(format, "WARNING: ", 9) && (level < 5))
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syslog(LOG_CRIT, "%s", format);
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else
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syslog(LOG_DEBUG, "%s", format);
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}
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static int _remove_failed_devices(const char *device)
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{
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int r;
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#define CMD_SIZE 256 /* FIXME Use system restriction */
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char cmd_str[CMD_SIZE];
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char *vg = NULL, *lv = NULL, *layer = NULL;
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if (strlen(device) > 200) /* FIXME Use real restriction */
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return -ENAMETOOLONG; /* FIXME These return code distinctions are not used so remove them! */
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if (!dm_split_lvm_name(_mem_pool, device, &vg, &lv, &layer)) {
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syslog(LOG_ERR, "Unable to determine VG name from %s",
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device);
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return -ENOMEM; /* FIXME Replace with generic error return - reason for failure has already got logged */
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}
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/* FIXME Is any sanity-checking required on %s? */
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if (CMD_SIZE <= snprintf(cmd_str, CMD_SIZE, "vgreduce --removemissing %s", vg)) {
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/* this error should be caught above, but doesn't hurt to check again */
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syslog(LOG_ERR, "Unable to form LVM command: Device name too long");
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dm_pool_empty(_mem_pool); /* FIXME: not safe with multiple threads */
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return -ENAMETOOLONG; /* FIXME Replace with generic error return - reason for failure has already got logged */
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}
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r = lvm2_run(_lvm_handle, cmd_str);
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dm_pool_empty(_mem_pool); /* FIXME: not safe with multiple threads */
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return (r == 1) ? 0 : -1;
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}
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void process_event(struct dm_task *dmt, enum dm_event_mask event,
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void **unused __attribute((unused)))
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{
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void *next = NULL;
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uint64_t start, length;
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char *target_type = NULL;
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char *params;
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const char *device = dm_task_get_name(dmt);
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if (pthread_mutex_trylock(&_event_mutex)) {
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syslog(LOG_NOTICE, "Another thread is handling an event. Waiting...");
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pthread_mutex_lock(&_event_mutex);
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}
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do {
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next = dm_get_next_target(dmt, next, &start, &length,
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&target_type, ¶ms);
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if (!target_type) {
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syslog(LOG_INFO, "%s mapping lost.\n", device);
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continue;
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}
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if (strcmp(target_type, "mirror")) {
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syslog(LOG_INFO, "%s has unmirrored portion.\n", device);
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continue;
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}
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switch(_get_mirror_event(params)) {
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case ME_INSYNC:
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/* FIXME: all we really know is that this
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_part_ of the device is in sync
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Also, this is not an error
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*/
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syslog(LOG_NOTICE, "%s is now in-sync\n", device);
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break;
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case ME_FAILURE:
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syslog(LOG_ERR, "Device failure in %s\n", device);
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if (_remove_failed_devices(device))
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/* FIXME Why are all the error return codes unused? Get rid of them? */
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syslog(LOG_ERR, "Failed to remove faulty devices in %s\n",
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device);
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/* Should check before warning user that device is now linear
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else
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syslog(LOG_NOTICE, "%s is now a linear device.\n",
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device);
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*/
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break;
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case ME_IGNORE:
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break;
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default:
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/* FIXME Provide value then! */
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syslog(LOG_INFO, "Unknown event received.\n");
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}
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} while (next);
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pthread_mutex_unlock(&_event_mutex);
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}
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int register_device(const char *device, const char *uuid, int major, int minor,
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void **unused __attribute((unused)))
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{
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int r = 0;
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pthread_mutex_lock(&_register_mutex);
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syslog(LOG_INFO, "Monitoring mirror device %s for events\n", device);
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/*
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* Need some space for allocations. 1024 should be more
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* than enough for what we need (device mapper name splitting)
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*/
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if (!_mem_pool && !(_mem_pool = dm_pool_create("mirror_dso", 1024)))
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goto out;
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if (!_lvm_handle) {
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lvm2_log_fn(_temporary_log_fn);
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if (!(_lvm_handle = lvm2_init())) {
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dm_pool_destroy(_mem_pool);
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_mem_pool = NULL;
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goto out;
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}
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lvm2_log_level(_lvm_handle, LVM2_LOG_SUPPRESS);
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/* FIXME Temporary: move to dmeventd core */
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lvm2_run(_lvm_handle, "_memlock_inc");
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}
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_register_count++;
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r = 1;
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out:
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pthread_mutex_unlock(&_register_mutex);
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return r;
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}
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int unregister_device(const char *device, const char *uuid, int major, int minor,
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void **unused __attribute((unused)))
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{
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pthread_mutex_lock(&_register_mutex);
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syslog(LOG_INFO, "No longer monitoring mirror device %s for events\n",
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device);
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if (!--_register_count) {
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dm_pool_destroy(_mem_pool);
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_mem_pool = NULL;
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lvm2_run(_lvm_handle, "_memlock_dec");
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lvm2_exit(_lvm_handle);
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_lvm_handle = NULL;
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}
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pthread_mutex_unlock(&_register_mutex);
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return 1;
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}
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