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dmeventd

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This commit is contained in:
Alasdair Kergon 2008-11-04 15:55:27 +00:00
parent 56d8844068
commit a479de2e75
11 changed files with 11 additions and 604 deletions
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4
Makefile.in
View File

@ -43,13 +43,13 @@ include make.tmpl
libdm: include
lib: libdm
daemons: lib
tools: lib
tools: lib device-mapper
po: tools daemons
libdm.device-mapper: include.device-mapper
daemons.device-mapper: libdm.device-mapper
tools.device-mapper: libdm.device-mapper
device-mapper: tools.device-mapper daemons.device-mapper
device-mapper: tools.device-mapper daemons.device-mapper man.device-mapper
ifeq ("@INTL@", "yes")
lib.pofile: include.pofile

5
daemons/Makefile.in
View File

@ -15,6 +15,8 @@ srcdir = @srcdir@
top_srcdir = @top_srcdir@
VPATH = @srcdir@
.PHONY: dmeventd clvmd
ifneq ("@CLVMD@", "none")
SUBDIRS = clvmd
endif
@ -23,7 +25,6 @@ ifeq ("@DMEVENTD@", "yes")
SUBDIRS += dmeventd
endif
device-mapper: dmeventd
include $(top_srcdir)/make.tmpl
device-mapper: dmeventd.device-mapper

1
daemons/dmeventd/Makefile.in
View File

@ -37,6 +37,7 @@ endif
include $(top_srcdir)/make.tmpl
all: dmeventd
device-mapper: dmeventd
LDFLAGS += -ldl -ldevmapper -lpthread
CLDFLAGS += -ldl -ldevmapper -lpthread

22
dmeventd/Makefile.in
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@ -1,22 +0,0 @@
#
# Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
# Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
#
# This file is part of LVM2.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
srcdir = @srcdir@
top_srcdir = @top_srcdir@
VPATH = @srcdir@
SUBDIRS += mirror snapshot
include $(top_srcdir)/make.tmpl

3
dmeventd/mirror/.exported_symbols
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@ -1,3 +0,0 @@
process_event
register_device
unregister_device

35
dmeventd/mirror/Makefile.in
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@ -1,35 +0,0 @@
#
# Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
# Copyright (C) 2004-2005, 2008 Red Hat, Inc. All rights reserved.
#
# This file is part of LVM2.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
srcdir = @srcdir@
top_srcdir = @top_srcdir@
VPATH = @srcdir@
INCLUDES += -I${top_srcdir}/tools
CLDFLAGS += -L${top_srcdir}/tools -ldevmapper @LVM2CMD_LIB@
SOURCES = dmeventd_mirror.c
ifeq ("@LIB_SUFFIX@","dylib")
LIB_SHARED = libdevmapper-event-lvm2mirror.dylib
else
LIB_SHARED = libdevmapper-event-lvm2mirror.so
endif
include $(top_srcdir)/make.tmpl
install: libdevmapper-event-lvm2mirror.$(LIB_SUFFIX)
$(INSTALL) -D $(OWNER) $(GROUP) -m 555 $(STRIP) $< \
$(libdir)/$<.$(LIB_VERSION)
$(LN_S) -f $<.$(LIB_VERSION) $(libdir)/$<

289
dmeventd/mirror/dmeventd_mirror.c
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@ -1,289 +0,0 @@
/*
* Copyright (C) 2005 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lvm2cmd.h"
#include <libdevmapper.h>
#include <libdevmapper-event.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <syslog.h> /* FIXME Replace syslog with multilog */
/* FIXME Missing openlog? */
#define ME_IGNORE 0
#define ME_INSYNC 1
#define ME_FAILURE 2
/*
* register_device() is called first and performs initialisation.
* Only one device may be registered or unregistered at a time.
*/
static pthread_mutex_t _register_mutex = PTHREAD_MUTEX_INITIALIZER;
/*
* Number of active registrations.
*/
static int _register_count = 0;
static struct dm_pool *_mem_pool = NULL;
static void *_lvm_handle = NULL;
/*
* Currently only one event can be processed at a time.
*/
static pthread_mutex_t _event_mutex = PTHREAD_MUTEX_INITIALIZER;
static int _get_mirror_event(char *params)
{
int i, r = ME_INSYNC;
char **args = NULL;
char *dev_status_str;
char *log_status_str;
char *sync_str;
char *p = NULL;
int log_argc, num_devs;
/*
* dm core parms: 0 409600 mirror
* Mirror core parms: 2 253:4 253:5 400/400
* New-style failure params: 1 AA
* New-style log params: 3 cluster 253:3 A
* or 3 disk 253:3 A
* or 1 core
*/
/* number of devices */
if (!dm_split_words(params, 1, 0, &p))
goto out_parse;
if (!(num_devs = atoi(p)))
goto out_parse;
p += strlen(p) + 1;
/* devices names + "400/400" + "1 AA" + 1 or 3 log parms + NULL */
args = dm_malloc((num_devs + 7) * sizeof(char *));
if (!args || dm_split_words(p, num_devs + 7, 0, args) < num_devs + 5)
goto out_parse;
dev_status_str = args[2 + num_devs];
log_argc = atoi(args[3 + num_devs]);
log_status_str = args[3 + num_devs + log_argc];
sync_str = args[num_devs];
/* Check for bad mirror devices */
for (i = 0; i < num_devs; i++)
if (dev_status_str[i] == 'D') {
syslog(LOG_ERR, "Mirror device, %s, has failed.\n", args[i]);
r = ME_FAILURE;
}
/* Check for bad disk log device */
if (log_argc > 1 && log_status_str[0] == 'D') {
syslog(LOG_ERR, "Log device, %s, has failed.\n",
args[2 + num_devs + log_argc]);
r = ME_FAILURE;
}
if (r == ME_FAILURE)
goto out;
p = strstr(sync_str, "/");
if (p) {
p[0] = '\0';
if (strcmp(sync_str, p+1))
r = ME_IGNORE;
p[0] = '/';
} else
goto out_parse;
out:
if (args)
dm_free(args);
return r;
out_parse:
if (args)
dm_free(args);
syslog(LOG_ERR, "Unable to parse mirror status string.");
return ME_IGNORE;
}
static void _temporary_log_fn(int level, const char *file __attribute((unused)),
int line __attribute((unused)),
const char *format)
{
if (!strncmp(format, "WARNING: ", 9) && (level < 5))
syslog(LOG_CRIT, "%s", format);
else
syslog(LOG_DEBUG, "%s", format);
}
static int _remove_failed_devices(const char *device)
{
int r;
#define CMD_SIZE 256 /* FIXME Use system restriction */
char cmd_str[CMD_SIZE];
char *vg = NULL, *lv = NULL, *layer = NULL;
if (strlen(device) > 200) /* FIXME Use real restriction */
return -ENAMETOOLONG; /* FIXME These return code distinctions are not used so remove them! */
if (!dm_split_lvm_name(_mem_pool, device, &vg, &lv, &layer)) {
syslog(LOG_ERR, "Unable to determine VG name from %s",
device);
return -ENOMEM; /* FIXME Replace with generic error return - reason for failure has already got logged */
}
/* FIXME Is any sanity-checking required on %s? */
if (CMD_SIZE <= snprintf(cmd_str, CMD_SIZE, "vgreduce --config devices{ignore_suspended_devices=1} --removemissing --force %s", vg)) {
/* this error should be caught above, but doesn't hurt to check again */
syslog(LOG_ERR, "Unable to form LVM command: Device name too long");
dm_pool_empty(_mem_pool); /* FIXME: not safe with multiple threads */
return -ENAMETOOLONG; /* FIXME Replace with generic error return - reason for failure has already got logged */
}
r = lvm2_run(_lvm_handle, cmd_str);
dm_pool_empty(_mem_pool); /* FIXME: not safe with multiple threads */
return (r == 1) ? 0 : -1;
}
void process_event(struct dm_task *dmt,
enum dm_event_mask event __attribute((unused)),
void **unused __attribute((unused)))
{
void *next = NULL;
uint64_t start, length;
char *target_type = NULL;
char *params;
const char *device = dm_task_get_name(dmt);
if (pthread_mutex_trylock(&_event_mutex)) {
syslog(LOG_NOTICE, "Another thread is handling an event. Waiting...");
pthread_mutex_lock(&_event_mutex);
}
do {
next = dm_get_next_target(dmt, next, &start, &length,
&target_type, &params);
if (!target_type) {
syslog(LOG_INFO, "%s mapping lost.\n", device);
continue;
}
if (strcmp(target_type, "mirror")) {
syslog(LOG_INFO, "%s has unmirrored portion.\n", device);
continue;
}
switch(_get_mirror_event(params)) {
case ME_INSYNC:
/* FIXME: all we really know is that this
_part_ of the device is in sync
Also, this is not an error
*/
syslog(LOG_NOTICE, "%s is now in-sync\n", device);
break;
case ME_FAILURE:
syslog(LOG_ERR, "Device failure in %s\n", device);
if (_remove_failed_devices(device))
/* FIXME Why are all the error return codes unused? Get rid of them? */
syslog(LOG_ERR, "Failed to remove faulty devices in %s\n",
device);
/* Should check before warning user that device is now linear
else
syslog(LOG_NOTICE, "%s is now a linear device.\n",
device);
*/
break;
case ME_IGNORE:
break;
default:
/* FIXME Provide value then! */
syslog(LOG_INFO, "Unknown event received.\n");
}
} while (next);
pthread_mutex_unlock(&_event_mutex);
}
int register_device(const char *device,
const char *uuid __attribute((unused)),
int major __attribute((unused)),
int minor __attribute((unused)),
void **unused __attribute((unused)))
{
int r = 0;
pthread_mutex_lock(&_register_mutex);
syslog(LOG_INFO, "Monitoring mirror device %s for events\n", device);
/*
* Need some space for allocations. 1024 should be more
* than enough for what we need (device mapper name splitting)
*/
if (!_mem_pool && !(_mem_pool = dm_pool_create("mirror_dso", 1024)))
goto out;
if (!_lvm_handle) {
lvm2_log_fn(_temporary_log_fn);
if (!(_lvm_handle = lvm2_init())) {
dm_pool_destroy(_mem_pool);
_mem_pool = NULL;
goto out;
}
lvm2_log_level(_lvm_handle, LVM2_LOG_SUPPRESS);
/* FIXME Temporary: move to dmeventd core */
lvm2_run(_lvm_handle, "_memlock_inc");
}
_register_count++;
r = 1;
out:
pthread_mutex_unlock(&_register_mutex);
return r;
}
int unregister_device(const char *device,
const char *uuid __attribute((unused)),
int major __attribute((unused)),
int minor __attribute((unused)),
void **unused __attribute((unused)))
{
pthread_mutex_lock(&_register_mutex);
syslog(LOG_INFO, "No longer monitoring mirror device %s for events\n",
device);
if (!--_register_count) {
dm_pool_destroy(_mem_pool);
_mem_pool = NULL;
lvm2_run(_lvm_handle, "_memlock_dec");
lvm2_exit(_lvm_handle);
_lvm_handle = NULL;
}
pthread_mutex_unlock(&_register_mutex);
return 1;
}

3
dmeventd/snapshot/.exported_symbols
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@ -1,3 +0,0 @@
process_event
register_device
unregister_device

35
dmeventd/snapshot/Makefile.in
View File

@ -1,35 +0,0 @@
#
# Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
# Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
#
# This file is part of the LVM2.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
srcdir = @srcdir@
top_srcdir = @top_srcdir@
VPATH = @srcdir@
INCLUDES += -I${top_srcdir}/tools
CLDFLAGS += -L${top_srcdir}/tools -ldevmapper @LVM2CMD_LIB@
SOURCES = dmeventd_snapshot.c
ifeq ("@LIB_SUFFIX@","dylib")
LIB_SHARED = libdevmapper-event-lvm2snapshot.dylib
else
LIB_SHARED = libdevmapper-event-lvm2snapshot.so
endif
include $(top_srcdir)/make.tmpl
install: libdevmapper-event-lvm2snapshot.$(LIB_SUFFIX)
$(INSTALL) -D $(OWNER) $(GROUP) -m 555 $(STRIP) $< \
$(libdir)/$<.$(LIB_VERSION)
$(LN_S) -f $<.$(LIB_VERSION) $(libdir)/$<

213
dmeventd/snapshot/dmeventd_snapshot.c
View File

@ -1,213 +0,0 @@
/*
* Copyright (C) 2007-2008 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "libdevmapper.h"
#include "libdevmapper-event.h"
#include "lvm2cmd.h"
#include "lvm-string.h"
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <syslog.h> /* FIXME Replace syslog with multilog */
/* FIXME Missing openlog? */
/* First warning when snapshot is 80% full. */
#define WARNING_THRESH 80
/* Further warnings at 85%, 90% and 95% fullness. */
#define WARNING_STEP 5
static pthread_mutex_t _register_mutex = PTHREAD_MUTEX_INITIALIZER;
/*
* Number of active registrations.
*/
static int _register_count = 0;
static struct dm_pool *_mem_pool = NULL;
static void *_lvm_handle = NULL;
struct snap_status {
int invalid;
int used;
int max;
};
/*
* Currently only one event can be processed at a time.
*/
static pthread_mutex_t _event_mutex = PTHREAD_MUTEX_INITIALIZER;
static void _temporary_log_fn(int level,
const char *file __attribute((unused)),
int line __attribute((unused)),
const char *format)
{
if (!strncmp(format, "WARNING: ", 9) && (level < 5))
syslog(LOG_CRIT, "%s", format);
else
syslog(LOG_DEBUG, "%s", format);
}
/* FIXME possibly reconcile this with target_percent when we gain
access to regular LVM library here. */
static void _parse_snapshot_params(char *params, struct snap_status *stat)
{
char *p;
/*
* xx/xx -- fractions used/max
* Invalid -- snapshot invalidated
* Unknown -- status unknown
*/
stat->used = stat->max = 0;
if (!strncmp(params, "Invalid", 7)) {
stat->invalid = 1;
return;
}
/*
* When we return without setting non-zero max, the parent is
* responsible for reporting errors.
*/
if (!strncmp(params, "Unknown", 7))
return;
if (!(p = strstr(params, "/")))
return;
*p = '\0';
p++;
stat->used = atoi(params);
stat->max = atoi(p);
}
void process_event(struct dm_task *dmt,
enum dm_event_mask event __attribute((unused)),
void **private)
{
void *next = NULL;
uint64_t start, length;
char *target_type = NULL;
char *params;
struct snap_status stat = { 0 };
const char *device = dm_task_get_name(dmt);
int percent, *percent_warning = (int*)private;
/* No longer monitoring, waiting for remove */
if (!*percent_warning)
return;
if (pthread_mutex_trylock(&_event_mutex)) {
syslog(LOG_NOTICE, "Another thread is handling an event. Waiting...");
pthread_mutex_lock(&_event_mutex);
}
dm_get_next_target(dmt, next, &start, &length, &target_type, &params);
if (!target_type)
goto out;
_parse_snapshot_params(params, &stat);
/*
* If the snapshot has been invalidated or we failed to parse
* the status string. Report the full status string to syslog.
*/
if (stat.invalid || !stat.max) {
syslog(LOG_ERR, "Snapshot %s changed state to: %s\n", device, params);
*percent_warning = 0;
goto out;
}
percent = 100 * stat.used / stat.max;
if (percent >= *percent_warning) {
syslog(LOG_WARNING, "Snapshot %s is now %i%% full.\n", device, percent);
/* Print warning on the next multiple of WARNING_STEP. */
*percent_warning = (percent / WARNING_STEP) * WARNING_STEP + WARNING_STEP;
}
out:
pthread_mutex_unlock(&_event_mutex);
}
int register_device(const char *device,
const char *uuid __attribute((unused)),
int major __attribute((unused)),
int minor __attribute((unused)),
void **private)
{
int r = 0;
int *percent_warning = (int*)private;
pthread_mutex_lock(&_register_mutex);
/*
* Need some space for allocations. 1024 should be more
* than enough for what we need (device mapper name splitting)
*/
if (!_mem_pool && !(_mem_pool = dm_pool_create("snapshot_dso", 1024)))
goto out;
*percent_warning = WARNING_THRESH; /* Print warning if snapshot is full */
if (!_lvm_handle) {
lvm2_log_fn(_temporary_log_fn);
if (!(_lvm_handle = lvm2_init())) {
dm_pool_destroy(_mem_pool);
_mem_pool = NULL;
goto out;
}
lvm2_log_level(_lvm_handle, LVM2_LOG_SUPPRESS);
/* FIXME Temporary: move to dmeventd core */
lvm2_run(_lvm_handle, "_memlock_inc");
}
syslog(LOG_INFO, "Monitoring snapshot %s\n", device);
_register_count++;
r = 1;
out:
pthread_mutex_unlock(&_register_mutex);
return r;
}
int unregister_device(const char *device,
const char *uuid __attribute((unused)),
int major __attribute((unused)),
int minor __attribute((unused)),
void **unused __attribute((unused)))
{
pthread_mutex_lock(&_register_mutex);
syslog(LOG_INFO, "No longer monitoring snapshot %s\n",
device);
if (!--_register_count) {
dm_pool_destroy(_mem_pool);
_mem_pool = NULL;
lvm2_run(_lvm_handle, "_memlock_dec");
lvm2_exit(_lvm_handle);
_lvm_handle = NULL;
}
pthread_mutex_unlock(&_register_mutex);
return 1;
}

5
make.tmpl.in
View File

@ -86,6 +86,11 @@ endif
LDFLAGS += -L$(top_srcdir)/libdm -L$(top_srcdir)/lib
CLDFLAGS += -L$(top_srcdir)/libdm -L$(top_srcdir)/lib
ifeq ("@DMEVENTD@", "yes")
LDFLAGS += -L$(top_srcdir)/daemons/dmeventd
CLDFLAGS += -L$(top_srcdir)/daemons/dmeventd
endif
ifeq ("@DM_COMPAT@", "yes")
DEFS += -DDM_COMPAT
endif