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devices: rework libudev usage

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related to config settings:
  obtain_device_info_from_udev (controls if lvm gets
    a list of devices from readdir /dev or from libudev)
  external_device_info_source (controls if lvm asks
    libudev for device information)

. Make the obtain_device_list_from_udev setting
  affect only the choice of readdir /dev vs libudev.
  The setting no longer controls if udev is used for
  device type checks.

. Change obtain_device_list_from_udev default to 0.
  This helps avoid boot timeouts due to slow libudev
  queries, avoids reported failures from
  udev_enumerate_scan_devices, and avoids delays from
  "device not initialized in udev database" errors.
  Even without errors, for a system booting with 1024 PVs,
  lvm2-pvscan times improve from about 100 sec to 15 sec,
  and the pvscan command from about 64 sec to about 4 sec.

. For external_device_info_source="none", remove all
  libudev device info queries, and use only lvm
  native device info.

. For external_device_info_source="udev", first check
  lvm native device info, then check libudev info.

. Remove sleep/retry loop when attempting libudev
  queries for device info.  udev info will simply
  be skipped if it's not immediately available.

. Only set up a libdev connection if it will be used by
  obtain_device_list_from_udev/external_device_info_source.

. For native multipath component detection, use
  /etc/multipath/wwids.  If a device has a wwid
  matching an entry in the wwids file, then it's
  considered a multipath component.  This is
  necessary to natively detect multipath
  components when the mpath device is not set up.
This commit is contained in:
David Teigland 2021-06-08 17:12:09 -05:00
parent db22a389cf
commit 9048565093
22 changed files with 659 additions and 683 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
lib/Makefile.in
View File

@ -34,6 +34,7 @@ SOURCES =\
device/dev-ext.c \
device/dev-io.c \
device/dev-md.c \
device/dev-mpath.c \
device/dev-swap.c \
device/dev-type.c \
device/dev-luks.c \

6
lib/cache/lvmcache.c vendored
View File

@ -692,7 +692,7 @@ next:
*/
info = lvmcache_info_from_pvid(pvid, NULL, 0);
if (info && dev_is_md_component(info->dev, NULL, 1)) {
if (info && dev_is_md_component(cmd, info->dev, NULL, 1)) {
/* does not go in del_cache_devs which become unused_duplicates */
log_debug_cache("PV %s drop MD component from scan selection %s", pvid, dev_name(info->dev));
lvmcache_del(info);
@ -700,7 +700,7 @@ next:
}
dm_list_iterate_items_safe(devl, devl_safe, &altdevs) {
if (dev_is_md_component(devl->dev, NULL, 1)) {
if (dev_is_md_component(cmd, devl->dev, NULL, 1)) {
log_debug_cache("PV %s drop MD component from scan duplicates %s", pvid, dev_name(devl->dev));
dm_list_del(&devl->list);
}
@ -1204,7 +1204,7 @@ void lvmcache_extra_md_component_checks(struct cmd_context *cmd)
(unsigned long long)pvsize, (unsigned long long)devsize,
device_hint ?: "none", dev_name(dev));
if (dev_is_md_component(dev, NULL, 1)) {
if (dev_is_md_component(cmd, dev, NULL, 1)) {
log_debug("dropping PV from md component %s", dev_name(dev));
dev->flags &= ~DEV_SCAN_FOUND_LABEL;
/* lvmcache_del will also delete vginfo if info was last one */

56
lib/commands/toolcontext.c
View File

@ -402,15 +402,12 @@ static void _init_logging(struct cmd_context *cmd)
reset_lvm_errno(1);
}
static int _check_disable_udev(const char *msg) {
static int _check_disable_udev(const char *msg)
{
if (getenv("DM_DISABLE_UDEV")) {
log_very_verbose("DM_DISABLE_UDEV environment variable set. "
"Overriding configuration to use "
"udev_rules=0, udev_sync=0, verify_udev_operations=1.");
if (udev_is_running())
log_warn("Udev is running and DM_DISABLE_UDEV environment variable is set. "
"Bypassing udev, LVM will %s.", msg);
log_very_verbose("DM_DISABLE_UDEV environment variable set.");
log_very_verbose("Overriding configuration to use udev_rules=0, udev_sync=0, verify_udev_operations=1.");
log_very_verbose("LVM will %s.", msg);
return 1;
}
@ -563,7 +560,7 @@ static int _init_system_id(struct cmd_context *cmd)
static int _process_config(struct cmd_context *cmd)
{
mode_t old_umask;
const char *dev_ext_info_src;
const char *dev_ext_info_src = NULL;
const char *read_ahead;
struct stat st;
const struct dm_config_node *cn;
@ -597,15 +594,26 @@ static int _process_config(struct cmd_context *cmd)
#endif
dev_ext_info_src = find_config_tree_str(cmd, devices_external_device_info_source_CFG, NULL);
if (dev_ext_info_src && !strcmp(dev_ext_info_src, "none"))
init_external_device_info_source(DEV_EXT_NONE);
else if (dev_ext_info_src && !strcmp(dev_ext_info_src, "udev"))
init_external_device_info_source(DEV_EXT_UDEV);
else {
log_error("Invalid external device info source specification.");
return 0;
if (dev_ext_info_src &&
strcmp(dev_ext_info_src, "none") &&
strcmp(dev_ext_info_src, "udev")) {
log_warn("WARNING: unknown external device info source, using none.");
dev_ext_info_src = NULL;
}
if (dev_ext_info_src && !strcmp(dev_ext_info_src, "udev")) {
if (udev_init_library_context()) {
init_external_device_info_source(DEV_EXT_UDEV);
} else {
log_warn("WARNING: failed to init udev for external device info, using none.");
dev_ext_info_src = NULL;
}
}
if (!dev_ext_info_src || !strcmp(dev_ext_info_src, "none"))
init_external_device_info_source(DEV_EXT_NONE);
/* proc dir */
if (dm_snprintf(cmd->proc_dir, sizeof(cmd->proc_dir), "%s",
find_config_tree_str(cmd, global_proc_CFG, NULL)) < 0) {
@ -1018,16 +1026,10 @@ static int _init_dev_cache(struct cmd_context *cmd)
if (!dev_cache_init(cmd))
return_0;
/*
* Override existing config and hardcode device_list_from_udev = 0 if:
* - udev is not running
* - udev is disabled using DM_DISABLE_UDEV environment variable
*/
if (_check_disable_udev("obtain device list by scanning device directory"))
device_list_from_udev = 0;
else
device_list_from_udev = udev_is_running() ?
find_config_tree_bool(cmd, devices_obtain_device_list_from_udev_CFG, NULL) : 0;
if ((device_list_from_udev = find_config_tree_bool(cmd, devices_obtain_device_list_from_udev_CFG, NULL))) {
if (!udev_init_library_context())
device_list_from_udev = 0;
}
init_obtain_device_list_from_udev(device_list_from_udev);
@ -1182,7 +1184,7 @@ static struct dev_filter *_init_filter_chain(struct cmd_context *cmd)
nr_filt++;
}
if (!(composite = composite_filter_create(nr_filt, 1, filters)))
if (!(composite = composite_filter_create(nr_filt, filters)))
goto_bad;
return composite;

24
lib/config/config_settings.h
View File

@ -238,22 +238,10 @@ cfg(devices_obtain_device_list_from_udev_CFG, "obtain_device_list_from_udev", de
"udev support for this setting to apply.\n")
cfg(devices_external_device_info_source_CFG, "external_device_info_source", devices_CFG_SECTION, 0, CFG_TYPE_STRING, DEFAULT_EXTERNAL_DEVICE_INFO_SOURCE, vsn(2, 2, 116), NULL, 0, NULL,
"Select an external device information source.\n"
"Some information may already be available in the system and LVM can\n"
"use this information to determine the exact type or use of devices it\n"
"processes. Using an existing external device information source can\n"
"speed up device processing as LVM does not need to run its own native\n"
"routines to acquire this information. For example, this information\n"
"is used to drive LVM filtering like MD component detection, multipath\n"
"component detection, partition detection and others.\n"
"#\n"
"Accepted values:\n"
" none\n"
" No external device information source is used.\n"
" udev\n"
" Reuse existing udev database records. Applicable only if LVM is\n"
" compiled with udev support.\n"
"#\n")
"Enable device information from udev.\n"
"If set to \"udev\", lvm will supplement its own native device information\n"
"with information from libudev. This can potentially improve the detection\n"
"of MD component devices and multipath component devices.\n")
cfg(devices_hints_CFG, "hints", devices_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_STRING, DEFAULT_HINTS, vsn(2, 3, 2), NULL, 0, NULL,
"Use a local file to remember which devices have PVs on them.\n"
@ -393,6 +381,10 @@ cfg(devices_scan_lvs_CFG, "scan_lvs", devices_CFG_SECTION, 0, CFG_TYPE_BOOL, DEF
cfg(devices_multipath_component_detection_CFG, "multipath_component_detection", devices_CFG_SECTION, 0, CFG_TYPE_BOOL, DEFAULT_MULTIPATH_COMPONENT_DETECTION, vsn(2, 2, 89), NULL, 0, NULL,
"Ignore devices that are components of DM multipath devices.\n")
cfg(devices_multipath_wwids_file_CFG, "multipath_wwids_file", devices_CFG_SECTION, CFG_DEFAULT_COMMENTED | CFG_ALLOW_EMPTY, CFG_TYPE_STRING, DEFAULT_WWIDS_FILE, vsn(2, 3, 13), NULL, 0, NULL,
"The path to the multipath wwids file used for multipath component detection.\n"
"Set this to an empty string to disable the use of the multipath wwids file.\n")
cfg(devices_md_component_detection_CFG, "md_component_detection", devices_CFG_SECTION, 0, CFG_TYPE_BOOL, DEFAULT_MD_COMPONENT_DETECTION, vsn(1, 0, 18), NULL, 0, NULL,
"Enable detection and exclusion of MD component devices.\n"
"An MD component device is a block device that MD uses as part\n"

4
lib/config/defaults.h
View File

@ -42,7 +42,7 @@
#define DEFAULT_DEV_DIR "/dev"
#define DEFAULT_PROC_DIR "/proc"
#define DEFAULT_SYSTEM_ID_SOURCE "none"
#define DEFAULT_OBTAIN_DEVICE_LIST_FROM_UDEV 1
#define DEFAULT_OBTAIN_DEVICE_LIST_FROM_UDEV 0
#define DEFAULT_EXTERNAL_DEVICE_INFO_SOURCE "none"
#define DEFAULT_SYSFS_SCAN 1
#define DEFAULT_MD_COMPONENT_DETECTION 1
@ -327,4 +327,6 @@
#define DEFAULT_SEARCH_FOR_DEVNAMES "auto"
#define DEFAULT_WWIDS_FILE "/etc/multipath/wwids"
#endif /* _LVM_DEFAULTS_H */

2
lib/device/dev-luks.c
View File

@ -18,7 +18,7 @@
#define LUKS_SIGNATURE "LUKS\xba\xbe"
#define LUKS_SIGNATURE_SIZE 6
int dev_is_luks(struct device *dev, uint64_t *offset_found, int full)
int dev_is_luks(struct cmd_context *cmd, struct device *dev, uint64_t *offset_found, int full)
{
char buf[LUKS_SIGNATURE_SIZE];
int ret = -1;

75
lib/device/dev-md.c
View File

@ -17,6 +17,7 @@
#include "lib/device/dev-type.h"
#include "lib/mm/xlate.h"
#include "lib/misc/crc.h"
#include "lib/commands/toolcontext.h"
#ifdef UDEV_SYNC_SUPPORT
#include <libudev.h> /* for MD detection using udev db records */
#include "lib/device/dev-ext-udev-constants.h"
@ -144,25 +145,16 @@ static int _dev_has_ddf_magic(struct device *dev, uint64_t devsize_sectors, uint
return 0;
}
/*
* _udev_dev_is_md_component() only works if
* external_device_info_source="udev"
*
* but
*
* udev_dev_is_md_component() in dev-type.c only works if
* obtain_device_list_from_udev=1
*
* and neither of those config setting matches very well
* with what we're doing here.
*/
#ifdef UDEV_SYNC_SUPPORT
static int _udev_dev_is_md_component(struct device *dev)
static int _dev_is_md_component_udev(struct device *dev)
{
const char *value;
struct dev_ext *ext;
/*
* external_device_info_source="udev" enables these udev checks.
* external_device_info_source="none" disables them.
*/
if (!(ext = dev_ext_get(dev)))
return_0;
@ -172,7 +164,7 @@ static int _udev_dev_is_md_component(struct device *dev)
return !strcmp(value, DEV_EXT_UDEV_BLKID_TYPE_SW_RAID);
}
#else
static int _udev_dev_is_md_component(struct device *dev)
static int _dev_is_md_component_udev(struct device *dev)
{
return 0;
}
@ -181,13 +173,16 @@ static int _udev_dev_is_md_component(struct device *dev)
/*
* Returns -1 on error
*/
static int _native_dev_is_md_component(struct device *dev, uint64_t *offset_found, int full)
static int _dev_is_md_component_native(struct device *dev, uint64_t *offset_found, int full)
{
uint64_t size, sb_offset = 0;
int ret;
if (!scan_bcache)
return -EAGAIN;
/* i/o layer has not been set up */
if (!scan_bcache) {
log_error(INTERNAL_ERROR "dev_is_md_component_native requires io layer.");
return -1;
}
if (!dev_get_size(dev, &size)) {
stack;
@ -295,41 +290,20 @@ out:
return ret;
}
int dev_is_md_component(struct device *dev, uint64_t *offset_found, int full)
int dev_is_md_component(struct cmd_context *cmd, struct device *dev, uint64_t *offset_found, int full)
{
int ret;
if (_dev_is_md_component_native(dev, offset_found, full) == 1)
goto found;
/*
* If non-native device status source is selected, use it
* only if offset_found is not requested as this
* information is not in udev db.
*/
if ((dev->ext.src == DEV_EXT_NONE) || offset_found) {
ret = _native_dev_is_md_component(dev, offset_found, full);
if (!full) {
if (!ret || (ret == -EAGAIN)) {
if (udev_dev_is_md_component(dev))
ret = 1;
}
}
if (ret && (ret != -EAGAIN))
dev->flags |= DEV_IS_MD_COMPONENT;
return ret;
if (external_device_info_source() == DEV_EXT_UDEV) {
if (_dev_is_md_component_udev(dev) == 1)
goto found;
}
return 0;
if (dev->ext.src == DEV_EXT_UDEV) {
ret = _udev_dev_is_md_component(dev);
if (ret && (ret != -EAGAIN))
dev->flags |= DEV_IS_MD_COMPONENT;
return ret;
}
log_error(INTERNAL_ERROR "Missing hook for MD device recognition "
"using external device info source %s", dev_ext_name(dev));
return -1;
found:
dev->flags |= DEV_IS_MD_COMPONENT;
return 1;
}
static int _md_sysfs_attribute_snprintf(char *path, size_t size,
@ -552,7 +526,8 @@ int dev_is_md_with_end_superblock(struct dev_types *dt, struct device *dev)
#else
int dev_is_md_component(struct device *dev __attribute__((unused)),
int dev_is_md_component(struct cmd_context *cmd __attribute__((unused)),
struct device *dev __attribute__((unused)),
uint64_t *sb __attribute__((unused)))
{
return 0;

486
lib/device/dev-mpath.c Normal file
View File

@ -0,0 +1,486 @@
/*
* Copyright (C) 2011 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "base/memory/zalloc.h"
#include "lib/misc/lib.h"
#include "lib/activate/activate.h"
#include "lib/commands/toolcontext.h"
#include "lib/device/device_id.h"
#ifdef UDEV_SYNC_SUPPORT
#include <libudev.h>
#include "lib/device/dev-ext-udev-constants.h"
#endif
#include <dirent.h>
#define MPATH_PREFIX "mpath-"
/*
* This hash table keeps track of whether a given dm device
* is a mpath device or not.
*
* If dm-3 is an mpath device, then the constant "2" is stored in
* the hash table with the key of the dm minor number ("3" for dm-3).
* If dm-3 is not an mpath device, then the constant "1" is stored in
* the hash table with the key of the dm minor number.
*/
static struct dm_pool *_hash_mem;
static struct dm_hash_table *_minor_hash_tab;
static struct dm_hash_table *_wwid_hash_tab;
#define MAX_WWID_LINE 512
/*
* do we need to check the multipath.conf blacklist?
*/
static void _read_wwid_file(const char *config_wwids_file)
{
FILE *fp;
char line[MAX_WWID_LINE];
char *wwid, *p;
int count = 0;
if (config_wwids_file[0] != '/') {
log_print("Ignoring unknown multipath_wwids_file.");
return;
}
if (!(fp = fopen(config_wwids_file, "r"))) {
log_debug("multipath wwids file not found");
return;
}
while (fgets(line, sizeof(line), fp)) {
if (line[0] == '#')
continue;
wwid = line;
if (line[0] == '/')
wwid++;
/* skip the initial '3' */
wwid++;
if ((p = strchr(wwid, '/')))
*p = '\0';
(void) dm_hash_insert_binary(_wwid_hash_tab, wwid, strlen(wwid), (void*)1);
count++;
}
if (fclose(fp))
stack;
log_debug("multipath wwids read %d from %s", count, config_wwids_file);
}
int dev_mpath_init(const char *config_wwids_file)
{
struct dm_pool *mem;
struct dm_hash_table *minor_tab;
struct dm_hash_table *wwid_tab;
if (!(mem = dm_pool_create("mpath", 256))) {
log_error("mpath pool creation failed.");
return 0;
}
if (!(minor_tab = dm_hash_create(110))) {
log_error("mpath hash table creation failed.");
dm_pool_destroy(mem);
return 0;
}
_hash_mem = mem;
_minor_hash_tab = minor_tab;
/* multipath_wwids_file="" disables the use of the file */
if (config_wwids_file && !strlen(config_wwids_file)) {
log_debug("multipath wwids file disabled.");
return 1;
}
if (!(wwid_tab = dm_hash_create(110))) {
log_error("mpath hash table creation failed.");
dm_hash_destroy(_minor_hash_tab);
dm_pool_destroy(_hash_mem);
_minor_hash_tab = NULL;
_hash_mem = NULL;
return 0;
}
_wwid_hash_tab = wwid_tab;
_read_wwid_file(config_wwids_file);
return 1;
}
void dev_mpath_exit(void)
{
if (_minor_hash_tab)
dm_hash_destroy(_minor_hash_tab);
if (_wwid_hash_tab)
dm_hash_destroy(_wwid_hash_tab);
if (_hash_mem)
dm_pool_destroy(_hash_mem);
_minor_hash_tab = NULL;
_wwid_hash_tab = NULL;
_hash_mem = NULL;
}
/*
* given "/dev/foo" return "foo"
*/
static const char *_get_sysfs_name(struct device *dev)
{
const char *name;
if (!(name = strrchr(dev_name(dev), '/'))) {
log_error("Cannot find '/' in device name.");
return NULL;
}
name++;
if (!*name) {
log_error("Device name is not valid.");
return NULL;
}
return name;
}
/*
* given major:minor
* readlink translates /sys/dev/block/major:minor to /sys/.../foo
* from /sys/.../foo return "foo"
*/
static const char *_get_sysfs_name_by_devt(const char *sysfs_dir, dev_t devno,
char *buf, size_t buf_size)
{
const char *name;
char path[PATH_MAX];
int size;
if (dm_snprintf(path, sizeof(path), "%sdev/block/%d:%d", sysfs_dir,
(int) MAJOR(devno), (int) MINOR(devno)) < 0) {
log_error("Sysfs path string is too long.");
return NULL;
}
if ((size = readlink(path, buf, buf_size - 1)) < 0) {
log_sys_error("readlink", path);
return NULL;
}
buf[size] = '\0';
if (!(name = strrchr(buf, '/'))) {
log_error("Cannot find device name in sysfs path.");
return NULL;
}
name++;
return name;
}
static int _get_sysfs_string(const char *path, char *buffer, int max_size)
{
FILE *fp;
int r = 0;
if (!(fp = fopen(path, "r"))) {
log_sys_error("fopen", path);
return 0;
}
if (!fgets(buffer, max_size, fp))
log_sys_error("fgets", path);
else
r = 1;
if (fclose(fp))
log_sys_error("fclose", path);
return r;
}
static int _get_sysfs_dm_mpath(struct dev_types *dt, const char *sysfs_dir, const char *holder_name)
{
char path[PATH_MAX];
char buffer[128];
if (dm_snprintf(path, sizeof(path), "%sblock/%s/dm/uuid", sysfs_dir, holder_name) < 0) {
log_error("Sysfs path string is too long.");
return 0;
}
buffer[0] = '\0';
if (!_get_sysfs_string(path, buffer, sizeof(buffer)))
return_0;
if (!strncmp(buffer, MPATH_PREFIX, 6))
return 1;
return 0;
}
static int _get_holder_name(const char *dir, char *name, int max_size)
{
struct dirent *d;
DIR *dr;
int r = 0;
if (!(dr = opendir(dir))) {
log_sys_error("opendir", dir);
return 0;
}
*name = '\0';
while ((d = readdir(dr))) {
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
/* There should be only one holder if it is multipath */
if (*name) {
r = 0;
break;
}
strncpy(name, d->d_name, max_size);
r = 1;
}
if (closedir(dr))
log_sys_debug("closedir", dir);
return r;
}
#ifdef UDEV_SYNC_SUPPORT
static int _dev_is_mpath_component_udev(struct device *dev)
{
const char *value;
struct dev_ext *ext;
/*
* external_device_info_source="udev" enables these udev checks.
* external_device_info_source="none" disables them.
*/
if (!(ext = dev_ext_get(dev)))
return_0;
value = udev_device_get_property_value((struct udev_device *)ext->handle, DEV_EXT_UDEV_BLKID_TYPE);
if (value && !strcmp(value, DEV_EXT_UDEV_BLKID_TYPE_MPATH))
return 1;
value = udev_device_get_property_value((struct udev_device *)ext->handle, DEV_EXT_UDEV_MPATH_DEVICE_PATH);
if (value && !strcmp(value, "1"))
return 1;
return 0;
}
#else
static int _dev_is_mpath_component_udev(struct device *dev)
{
return 0;
}
#endif
static int _dev_is_mpath_component_sysfs(struct cmd_context *cmd, struct device *dev)
{
struct dev_types *dt = cmd->dev_types;
const char *part_name;
const char *name; /* e.g. "sda" for "/dev/sda" */
char link_path[PATH_MAX]; /* some obscure, unpredictable sysfs path */
char holders_path[PATH_MAX]; /* e.g. "/sys/block/sda/holders/" */
char dm_dev_path[PATH_MAX]; /* e.g. "/dev/dm-1" */
char holder_name[256]; /* e.g. "dm-1" */
const char *sysfs_dir = dm_sysfs_dir();
int dev_major = MAJOR(dev->dev);
int dev_minor = MINOR(dev->dev);
int dm_dev_major;
int dm_dev_minor;
struct stat info;
dev_t primary_dev;
/* multipathing is only known to exist for SCSI or NVME devices */
if (!major_is_scsi_device(dt, dev_major) && !dev_is_nvme(dt, dev))
return 0;
switch (dev_get_primary_dev(dt, dev, &primary_dev)) {
case 2: /* The dev is partition. */
part_name = dev_name(dev); /* name of original dev for log_debug msg */
/* gets "foo" for "/dev/foo" where "/dev/foo" comes from major:minor */
if (!(name = _get_sysfs_name_by_devt(sysfs_dir, primary_dev, link_path, sizeof(link_path))))
return_0;
log_debug_devs("%s: Device is a partition, using primary "
"device %s for mpath component detection",
part_name, name);
break;
case 1: /* The dev is already a primary dev. Just continue with the dev. */
/* gets "foo" for "/dev/foo" */
if (!(name = _get_sysfs_name(dev)))
return_0;
break;
default: /* 0, error. */
log_warn("Failed to get primary device for %d:%d.", dev_major, dev_minor);
return 0;
}
if (dm_snprintf(holders_path, sizeof(holders_path), "%sblock/%s/holders", sysfs_dir, name) < 0) {
log_warn("Sysfs path to check mpath is too long.");
return 0;
}
/* also will filter out partitions */
if (stat(holders_path, &info))
return 0;
if (!S_ISDIR(info.st_mode)) {
log_warn("Path %s is not a directory.", holders_path);
return 0;
}
/*
* If holders dir contains an entry such as "dm-1", then this sets
* holder_name to "dm-1".
*
* If holders dir is empty, return 0 (this is generally where
* devs that are not mpath components return.)
*/
if (!_get_holder_name(holders_path, holder_name, sizeof(holder_name)))
return 0;
if (dm_snprintf(dm_dev_path, sizeof(dm_dev_path), "%s/%s", cmd->dev_dir, holder_name) < 0) {
log_warn("dm device path to check mpath is too long.");
return 0;
}
/*
* stat "/dev/dm-1" which is the holder of the dev we're checking
* dm_dev_major:dm_dev_minor come from stat("/dev/dm-1")
*/
if (stat(dm_dev_path, &info)) {
log_debug_devs("dev_is_mpath_component %s holder %s stat result %d",
dev_name(dev), dm_dev_path, errno);
return 0;
}
dm_dev_major = (int)MAJOR(info.st_rdev);
dm_dev_minor = (int)MINOR(info.st_rdev);
if (dm_dev_major != dt->device_mapper_major) {
log_debug_devs("dev_is_mpath_component %s holder %s %d:%d does not have dm major",
dev_name(dev), dm_dev_path, dm_dev_major, dm_dev_minor);
return 0;
}
/*
* Save the result of checking that "/dev/dm-1" is an mpath device
* to avoid repeating it for each path component.
* The minor number of "/dev/dm-1" is added to the hash table with
* const value 2 meaning that dm minor 1 (for /dev/dm-1) is a multipath dev
* and const value 1 meaning that dm minor 1 is not a multipath dev.
*/
if (_minor_hash_tab) {
long look = (long) dm_hash_lookup_binary(_minor_hash_tab, &dm_dev_minor, sizeof(dm_dev_minor));
if (look > 0) {
log_debug_devs("dev_is_mpath_component %s holder %s %u:%u already checked as %sbeing mpath.",
dev_name(dev), holder_name, dm_dev_major, dm_dev_minor, (look > 1) ? "" : "not ");
return (look > 1) ? 1 : 0;
}
}
/*
* Returns 1 if /sys/block/<holder_name>/dm/uuid indicates that
* <holder_name> is a dm device with dm uuid prefix mpath-.
* When true, <holder_name> will be something like "dm-1".
*/
if (_get_sysfs_dm_mpath(dt, sysfs_dir, holder_name)) {
log_debug_devs("dev_is_mpath_component %s holder %s %u:%u ignore mpath component",
dev_name(dev), holder_name, dm_dev_major, dm_dev_minor);
if (_minor_hash_tab)
(void) dm_hash_insert_binary(_minor_hash_tab, &dm_dev_minor, sizeof(dm_dev_minor), (void*)2);
return 1;
}
if (_minor_hash_tab)
(void) dm_hash_insert_binary(_minor_hash_tab, &dm_dev_minor, sizeof(dm_dev_minor), (void*)1);
return 0;
}
static int _dev_in_wwid_file(struct cmd_context *cmd, struct device *dev)
{
char sysbuf[PATH_MAX] = { 0 };
char *wwid;
long look;
if (!_wwid_hash_tab)
return 0;
if (!read_sys_block(cmd, dev, "device/wwid", sysbuf, sizeof(sysbuf)))
return 0;
if (!sysbuf[0])
return 0;
/*
* sysfs prints wwid as <typestr>.<value>
* multipath wwid uses '3'<value>
* does "<typestr>." always correspond to "3"?
*/
if (!(wwid = strchr(sysbuf, '.')))
return 0;
/* skip the type and dot, just as '3' was skipped from wwids entry */
wwid++;
look = (long) dm_hash_lookup_binary(_wwid_hash_tab, wwid, strlen(wwid));
if (look) {
log_debug_devs("dev_is_mpath_component %s multipath wwid %s", dev_name(dev), wwid);
return 1;
}
return 0;
}
int dev_is_mpath_component(struct cmd_context *cmd, struct device *dev)
{
if (_dev_is_mpath_component_sysfs(cmd, dev) == 1)
goto found;
if (_dev_in_wwid_file(cmd, dev))
goto found;
if (external_device_info_source() == DEV_EXT_UDEV) {
if (_dev_is_mpath_component_udev(dev) == 1)
goto found;
}
return 0;
found:
return 1;
}

2
lib/device/dev-swap.c
View File

@ -35,7 +35,7 @@ static int _swap_detect_signature(const char *buf)
return 0;
}
int dev_is_swap(struct device *dev, uint64_t *offset_found, int full)
int dev_is_swap(struct cmd_context *cmd, struct device *dev, uint64_t *offset_found, int full)
{
char buf[10];
uint64_t size;

197
lib/device/dev-type.c
View File

@ -621,12 +621,16 @@ static int _has_partition_table(struct device *dev)
}
#ifdef UDEV_SYNC_SUPPORT
static int _udev_dev_is_partitioned(struct dev_types *dt, struct device *dev)
static int _dev_is_partitioned_udev(struct dev_types *dt, struct device *dev)
{
struct dev_ext *ext;
struct udev_device *device;
const char *value;
/*
* external_device_info_source="udev" enables these udev checks.
* external_device_info_source="none" disables them.
*/
if (!(ext = dev_ext_get(dev)))
return_0;
@ -657,21 +661,20 @@ static int _udev_dev_is_partitioned(struct dev_types *dt, struct device *dev)
return !strcmp(value, DEV_EXT_UDEV_DEVTYPE_DISK);
}
#else
static int _udev_dev_is_partitioned(struct dev_types *dt, struct device *dev)
static int _dev_is_partitioned_udev(struct dev_types *dt, struct device *dev)
{
return 0;
}
#endif
static int _native_dev_is_partitioned(struct dev_types *dt, struct device *dev)
static int _dev_is_partitioned_native(struct dev_types *dt, struct device *dev)
{
int r;
if (!scan_bcache)
return -EAGAIN;
if (!_is_partitionable(dt, dev))
return 0;
if (!scan_bcache) {
log_error(INTERNAL_ERROR "dev_is_partitioned_native requires i/o.");
return -1;
}
/* Unpartitioned DASD devices are not supported. */
if ((MAJOR(dev->dev) == dt->dasd_major) && dasd_is_cdl_formatted(dev))
@ -682,16 +685,20 @@ static int _native_dev_is_partitioned(struct dev_types *dt, struct device *dev)
return r;
}
int dev_is_partitioned(struct dev_types *dt, struct device *dev)
int dev_is_partitioned(struct cmd_context *cmd, struct device *dev)
{
if (dev->ext.src == DEV_EXT_NONE)
return _native_dev_is_partitioned(dt, dev);
struct dev_types *dt = cmd->dev_types;
if (dev->ext.src == DEV_EXT_UDEV)
return _udev_dev_is_partitioned(dt, dev);
if (!_is_partitionable(dt, dev))
return 0;
log_error(INTERNAL_ERROR "Missing hook for partition table recognition "
"using external device info source %s", dev_ext_name(dev));
if (_dev_is_partitioned_native(dt, dev) == 1)
return 1;
if (external_device_info_source() == DEV_EXT_UDEV) {
if (_dev_is_partitioned_udev(dt, dev) == 1)
return 1;
}
return 0;
}
@ -1003,14 +1010,14 @@ out:
#endif /* BLKID_WIPING_SUPPORT */
static int _wipe_signature(struct device *dev, const char *type, const char *name,
static int _wipe_signature(struct cmd_context *cmd, struct device *dev, const char *type, const char *name,
int wipe_len, int yes, force_t force, int *wiped,
int (*signature_detection_fn)(struct device *dev, uint64_t *offset_found, int full))
int (*signature_detection_fn)(struct cmd_context *cmd, struct device *dev, uint64_t *offset_found, int full))
{
int wipe;
uint64_t offset_found = 0;
wipe = signature_detection_fn(dev, &offset_found, 1);
wipe = signature_detection_fn(cmd, dev, &offset_found, 1);
if (wipe == -1) {
log_error("Fatal error while trying to detect %s on %s.",
type, name);
@ -1038,7 +1045,7 @@ static int _wipe_signature(struct device *dev, const char *type, const char *nam
return 1;
}
static int _wipe_known_signatures_with_lvm(struct device *dev, const char *name,
static int _wipe_known_signatures_with_lvm(struct cmd_context *cmd, struct device *dev, const char *name,
uint32_t types_to_exclude __attribute__((unused)),
uint32_t types_no_prompt __attribute__((unused)),
int yes, force_t force, int *wiped)
@ -1049,9 +1056,9 @@ static int _wipe_known_signatures_with_lvm(struct device *dev, const char *name,
wiped = &wiped_tmp;
*wiped = 0;
if (!_wipe_signature(dev, "software RAID md superblock", name, 4, yes, force, wiped, dev_is_md_component) ||
!_wipe_signature(dev, "swap signature", name, 10, yes, force, wiped, dev_is_swap) ||
!_wipe_signature(dev, "LUKS signature", name, 8, yes, force, wiped, dev_is_luks))
if (!_wipe_signature(cmd, dev, "software RAID md superblock", name, 4, yes, force, wiped, dev_is_md_component) ||
!_wipe_signature(cmd, dev, "swap signature", name, 10, yes, force, wiped, dev_is_swap) ||
!_wipe_signature(cmd, dev, "LUKS signature", name, 8, yes, force, wiped, dev_is_luks))
return 0;
return 1;
@ -1076,7 +1083,7 @@ int wipe_known_signatures(struct cmd_context *cmd, struct device *dev,
"while LVM is not compiled with blkid wiping support.");
log_warn("WARNING: Falling back to native LVM signature detection.");
}
return _wipe_known_signatures_with_lvm(dev, name,
return _wipe_known_signatures_with_lvm(cmd, dev, name,
types_to_exclude,
types_no_prompt,
yes, force, wiped);
@ -1266,147 +1273,3 @@ int dev_is_pmem(struct dev_types *dt, struct device *dev)
}
#endif
#ifdef UDEV_SYNC_SUPPORT
/*
* Udev daemon usually has 30s timeout to process each event by default.
* But still, that value can be changed in udev configuration and we
* don't have libudev API to read the actual timeout value used.
*/
/* FIXME: Is this long enough to wait for udev db to get initialized?
*
* Take also into consideration that this check is done for each
* device that is scanned so we don't want to wait for a long time
* if there's something wrong with udev, e.g. timeouts! With current
* libudev API, we can't recognize whether the event processing has
* not finished yet and it's still being processed or whether it has
* failed already due to timeout in udev - in both cases the
* udev_device_get_is_initialized returns 0.
*/
#define UDEV_DEV_IS_COMPONENT_ITERATION_COUNT 100
#define UDEV_DEV_IS_COMPONENT_USLEEP 100000
static struct udev_device *_udev_get_dev(struct device *dev)
{
struct udev *udev_context = udev_get_library_context();
struct udev_device *udev_device = NULL;
int initialized = 0;
unsigned i = 0;
if (!udev_context) {
log_warn("WARNING: No udev context available to check if device %s is multipath component.", dev_name(dev));
return NULL;
}
while (1) {
if (i >= UDEV_DEV_IS_COMPONENT_ITERATION_COUNT)
break;
if (udev_device)
udev_device_unref(udev_device);
if (!(udev_device = udev_device_new_from_devnum(udev_context, 'b', dev->dev))) {
log_warn("WARNING: Failed to get udev device handler for device %s.", dev_name(dev));
return NULL;
}
#ifdef HAVE_LIBUDEV_UDEV_DEVICE_GET_IS_INITIALIZED
if ((initialized = udev_device_get_is_initialized(udev_device)))
break;
#else
if ((initialized = (udev_device_get_property_value(udev_device, DEV_EXT_UDEV_DEVLINKS) != NULL)))
break;
#endif
log_debug("Device %s not initialized in udev database (%u/%u, %u microseconds).", dev_name(dev),
i + 1, UDEV_DEV_IS_COMPONENT_ITERATION_COUNT,
i * UDEV_DEV_IS_COMPONENT_USLEEP);
if (!udev_sleeping())
break;
usleep(UDEV_DEV_IS_COMPONENT_USLEEP);
i++;
}
if (!initialized) {
log_warn("WARNING: Device %s not initialized in udev database even after waiting %u microseconds.",
dev_name(dev), i * UDEV_DEV_IS_COMPONENT_USLEEP);
goto out;
}
out:
return udev_device;
}
int udev_dev_is_mpath_component(struct device *dev)
{
struct udev_device *udev_device;
const char *value;
int ret = 0;
if (!obtain_device_list_from_udev())
return 0;
if (!(udev_device = _udev_get_dev(dev)))
return 0;
value = udev_device_get_property_value(udev_device, DEV_EXT_UDEV_BLKID_TYPE);
if (value && !strcmp(value, DEV_EXT_UDEV_BLKID_TYPE_MPATH)) {
log_debug("Device %s is multipath component based on blkid variable in udev db (%s=\"%s\").",
dev_name(dev), DEV_EXT_UDEV_BLKID_TYPE, value);
ret = 1;
goto out;
}
value = udev_device_get_property_value(udev_device, DEV_EXT_UDEV_MPATH_DEVICE_PATH);
if (value && !strcmp(value, "1")) {
log_debug("Device %s is multipath component based on multipath variable in udev db (%s=\"%s\").",
dev_name(dev), DEV_EXT_UDEV_MPATH_DEVICE_PATH, value);
ret = 1;
goto out;
}
out:
udev_device_unref(udev_device);
return ret;
}
int udev_dev_is_md_component(struct device *dev)
{
struct udev_device *udev_device;
const char *value;
int ret = 0;
if (!obtain_device_list_from_udev())
return 0;
if (!(udev_device = _udev_get_dev(dev)))
return 0;
value = udev_device_get_property_value(udev_device, DEV_EXT_UDEV_BLKID_TYPE);
if (value && !strcmp(value, DEV_EXT_UDEV_BLKID_TYPE_SW_RAID)) {
log_debug("Device %s is md raid component based on blkid variable in udev db (%s=\"%s\").",
dev_name(dev), DEV_EXT_UDEV_BLKID_TYPE, value);
dev->flags |= DEV_IS_MD_COMPONENT;
ret = 1;
goto out;
}
out:
udev_device_unref(udev_device);
return ret;
}
#else
int udev_dev_is_mpath_component(struct device *dev)
{
return 0;
}
int udev_dev_is_md_component(struct device *dev)
{
return 0;
}
#endif

11
lib/device/dev-type.h
View File

@ -57,12 +57,11 @@ const char *dev_subsystem_name(struct dev_types *dt, struct device *dev);
int major_is_scsi_device(struct dev_types *dt, int major);
/* Signature/superblock recognition with position returned where found. */
int dev_is_md_component(struct device *dev, uint64_t *sb, int full);
int dev_is_swap(struct device *dev, uint64_t *signature, int full);
int dev_is_luks(struct device *dev, uint64_t *signature, int full);
int dev_is_md_component(struct cmd_context *cmd, struct device *dev, uint64_t *sb, int full);
int dev_is_mpath_component(struct cmd_context *cmd, struct device *dev);
int dev_is_swap(struct cmd_context *cmd, struct device *dev, uint64_t *signature, int full);
int dev_is_luks(struct cmd_context *cmd, struct device *dev, uint64_t *signature, int full);
int dasd_is_cdl_formatted(struct device *dev);
int udev_dev_is_mpath_component(struct device *dev);
int udev_dev_is_md_component(struct device *dev);
int dev_is_lvm1(struct device *dev, char *buf, int buflen);
int dev_is_pool(struct device *dev, char *buf, int buflen);
@ -81,7 +80,7 @@ int dev_is_md_with_end_superblock(struct dev_types *dt, struct device *dev);
/* Partitioning */
int major_max_partitions(struct dev_types *dt, int major);
int dev_is_partitioned(struct dev_types *dt, struct device *dev);
int dev_is_partitioned(struct cmd_context *cmd, struct device *dev);
int dev_get_primary_dev(struct dev_types *dt, struct device *dev, dev_t *result);
int dev_get_partition_number(struct device *dev, int *num);

3
lib/device/device.h
View File

@ -205,4 +205,7 @@ void dev_destroy_file(struct device *dev);
/* Return a valid device name from the alias list; NULL otherwise */
const char *dev_name_confirmed(struct device *dev, int quiet);
int dev_mpath_init(const char *config_wwids_file);
void dev_mpath_exit(void);
#endif

38
lib/device/device_id.c
View File

@ -180,7 +180,7 @@ void free_dids(struct dm_list *ids)
}
}
static int _read_sys_block(struct cmd_context *cmd, struct device *dev, const char *suffix, char *sysbuf, int sysbufsize)
int read_sys_block(struct cmd_context *cmd, struct device *dev, const char *suffix, char *sysbuf, int sysbufsize)
{
char path[PATH_MAX];
dev_t devt = dev->dev;
@ -246,7 +246,7 @@ static int _dev_has_mpath_uuid(struct cmd_context *cmd, struct device *dev, cons
char sysbuf[PATH_MAX] = { 0 };
const char *idname;
if (!_read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
if (!read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
return 0;
if (!_dm_uuid_has_prefix(sysbuf, "mpath-"))
@ -265,7 +265,7 @@ static int _dev_has_crypt_uuid(struct cmd_context *cmd, struct device *dev, cons
char sysbuf[PATH_MAX] = { 0 };
const char *idname;
if (!_read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
if (!read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
return 0;
if (!_dm_uuid_has_prefix(sysbuf, "CRYPT-"))
@ -284,7 +284,7 @@ static int _dev_has_lvmlv_uuid(struct cmd_context *cmd, struct device *dev, cons
char sysbuf[PATH_MAX] = { 0 };
const char *idname;
if (!_read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
if (!read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
return 0;
if (!_dm_uuid_has_prefix(sysbuf, "LVM-"))
@ -304,10 +304,10 @@ const char *device_id_system_read(struct cmd_context *cmd, struct device *dev, u
const char *idname = NULL;
if (idtype == DEV_ID_TYPE_SYS_WWID) {
_read_sys_block(cmd, dev, "device/wwid", sysbuf, sizeof(sysbuf));
read_sys_block(cmd, dev, "device/wwid", sysbuf, sizeof(sysbuf));
if (!sysbuf[0])
_read_sys_block(cmd, dev, "wwid", sysbuf, sizeof(sysbuf));
read_sys_block(cmd, dev, "wwid", sysbuf, sizeof(sysbuf));
/* scsi_debug wwid begins "t10.Linux scsi_debug ..." */
if (strstr(sysbuf, "scsi_debug"))
@ -319,22 +319,22 @@ const char *device_id_system_read(struct cmd_context *cmd, struct device *dev, u
}
else if (idtype == DEV_ID_TYPE_SYS_SERIAL)
_read_sys_block(cmd, dev, "device/serial", sysbuf, sizeof(sysbuf));
read_sys_block(cmd, dev, "device/serial", sysbuf, sizeof(sysbuf));
else if (idtype == DEV_ID_TYPE_MPATH_UUID)
_read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf));
read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf));
else if (idtype == DEV_ID_TYPE_CRYPT_UUID)
_read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf));
read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf));
else if (idtype == DEV_ID_TYPE_LVMLV_UUID)
_read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf));
read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf));
else if (idtype == DEV_ID_TYPE_MD_UUID)
_read_sys_block(cmd, dev, "md/uuid", sysbuf, sizeof(sysbuf));
read_sys_block(cmd, dev, "md/uuid", sysbuf, sizeof(sysbuf));
else if (idtype == DEV_ID_TYPE_LOOP_FILE) {
_read_sys_block(cmd, dev, "loop/backing_file", sysbuf, sizeof(sysbuf));
read_sys_block(cmd, dev, "loop/backing_file", sysbuf, sizeof(sysbuf));
/* if backing file is deleted, fall back to devname */
if (strstr(sysbuf, "(deleted)"))
sysbuf[0] = '\0';
@ -372,17 +372,17 @@ static int _dev_has_stable_id(struct cmd_context *cmd, struct device *dev)
return 1;
}
if (_read_sys_block(cmd, dev, "device/wwid", sysbuf, sizeof(sysbuf)))
if (read_sys_block(cmd, dev, "device/wwid", sysbuf, sizeof(sysbuf)))
return 1;
if (_read_sys_block(cmd, dev, "wwid", sysbuf, sizeof(sysbuf)))
if (read_sys_block(cmd, dev, "wwid", sysbuf, sizeof(sysbuf)))
return 1;
if (_read_sys_block(cmd, dev, "device/serial", sysbuf, sizeof(sysbuf)))
if (read_sys_block(cmd, dev, "device/serial", sysbuf, sizeof(sysbuf)))
return 1;
if ((MAJOR(dev->dev) == cmd->dev_types->device_mapper_major)) {
if (!_read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
if (!read_sys_block(cmd, dev, "dm/uuid", sysbuf, sizeof(sysbuf)))
goto_out;
if (_dm_uuid_has_prefix(sysbuf, "mpath-"))
@ -394,11 +394,11 @@ static int _dev_has_stable_id(struct cmd_context *cmd, struct device *dev)
}
if ((MAJOR(dev->dev) == cmd->dev_types->md_major) &&
_read_sys_block(cmd, dev, "md/uuid", sysbuf, sizeof(sysbuf)))
read_sys_block(cmd, dev, "md/uuid", sysbuf, sizeof(sysbuf)))
return 1;
if ((MAJOR(dev->dev) == cmd->dev_types->loop_major) &&
_read_sys_block(cmd, dev, "loop/backing_file", sysbuf, sizeof(sysbuf)))
read_sys_block(cmd, dev, "loop/backing_file", sysbuf, sizeof(sysbuf)))
return 1;
out:
/* DEV_ID_TYPE_DEVNAME would be used for this dev. */
@ -1190,7 +1190,7 @@ id_done:
if (!label_scan_open(du_devid->dev))
log_warn("Cannot open %s", dev_name(du_devid->dev));
if (dev_is_partitioned(cmd->dev_types, du_devid->dev)) {
if (dev_is_partitioned(cmd, du_devid->dev)) {
/* Check if existing entry is whole device and new entry is a partition of it. */
ret1 = dev_get_primary_dev(cmd->dev_types, dev, &devt1);
if ((ret1 == 2) && (devt1 == du_devid->dev->dev))

2
lib/device/device_id.h
View File

@ -52,4 +52,6 @@ void devices_file_exit(struct cmd_context *cmd);
void unlink_searched_devnames(struct cmd_context *cmd);
int read_sys_block(struct cmd_context *cmd, struct device *dev, const char *suffix, char *sysbuf, int sysbufsize);
#endif

25
lib/filters/filter-composite.c
View File

@ -21,29 +21,24 @@
static int _and_p(struct cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name)
{
struct dev_filter **filters;
int ret;
int ret = 1;
dev_ext_enable(dev, external_device_info_source());
for (filters = (struct dev_filter **) f->private; *filters; ++filters) {
if (use_filter_name && strcmp((*filters)->name, use_filter_name))
continue;
ret = (*filters)->passes_filter(cmd, *filters, dev, use_filter_name);
if (!ret)
return 0; /* No 'stack': a filter, not an error. */
if (!ret) {
ret = 0; /* No 'stack': a filter, not an error. */
break;
}
}
return 1;
}
static int _and_p_with_dev_ext_info(struct cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name)
{
int r;
dev_ext_enable(dev, external_device_info_source());
r = _and_p(cmd, f, dev, use_filter_name);
dev_ext_disable(dev);
return r;
return ret;
}
static void _composite_destroy(struct dev_filter *f)
@ -72,7 +67,7 @@ static void _wipe(struct cmd_context *cmd, struct dev_filter *f, struct device *
}
}
struct dev_filter *composite_filter_create(int n, int use_dev_ext_info, struct dev_filter **filters)
struct dev_filter *composite_filter_create(int n, struct dev_filter **filters)
{
struct dev_filter **filters_copy, *cft;
@ -93,7 +88,7 @@ struct dev_filter *composite_filter_create(int n, int use_dev_ext_info, struct d
return NULL;
}
cft->passes_filter = use_dev_ext_info ? _and_p_with_dev_ext_info : _and_p;
cft->passes_filter = _and_p;
cft->destroy = _composite_destroy;
cft->wipe = _wipe;
cft->use_count = 0;

2
lib/filters/filter-md.c
View File

@ -98,7 +98,7 @@ static int _passes_md_filter(struct cmd_context *cmd, struct dev_filter *f __att
if (!md_filtering())
return 1;
ret = dev_is_md_component(dev, NULL, cmd->use_full_md_check);
ret = dev_is_md_component(cmd, dev, NULL, cmd->use_full_md_check);
if (ret == -EAGAIN) {
/* let pass, call again after scan */

362
lib/filters/filter-mpath.c
View File

@ -17,333 +17,17 @@
#include "lib/filters/filter.h"
#include "lib/activate/activate.h"
#include "lib/commands/toolcontext.h"
#ifdef UDEV_SYNC_SUPPORT
#include <libudev.h>
#include "lib/device/dev-ext-udev-constants.h"
#endif
#ifdef __linux__
#include <dirent.h>
#define MPATH_PREFIX "mpath-"
struct mpath_priv {
struct dm_pool *mem;
struct dev_filter f;
struct dev_types *dt;
struct dm_hash_table *hash;
};
/*
* given "/dev/foo" return "foo"
*/
static const char *_get_sysfs_name(struct device *dev)
{
const char *name;
if (!(name = strrchr(dev_name(dev), '/'))) {
log_error("Cannot find '/' in device name.");
return NULL;
}
name++;
if (!*name) {
log_error("Device name is not valid.");
return NULL;
}
return name;
}
/*
* given major:minor
* readlink translates /sys/dev/block/major:minor to /sys/.../foo
* from /sys/.../foo return "foo"
*/
static const char *_get_sysfs_name_by_devt(const char *sysfs_dir, dev_t devno,
char *buf, size_t buf_size)
{
const char *name;
char path[PATH_MAX];
int size;
if (dm_snprintf(path, sizeof(path), "%sdev/block/%d:%d", sysfs_dir,
(int) MAJOR(devno), (int) MINOR(devno)) < 0) {
log_error("Sysfs path string is too long.");
return NULL;
}
if ((size = readlink(path, buf, buf_size - 1)) < 0) {
log_sys_error("readlink", path);
return NULL;
}
buf[size] = '\0';
if (!(name = strrchr(buf, '/'))) {
log_error("Cannot find device name in sysfs path.");
return NULL;
}
name++;
return name;
}
static int _get_sysfs_string(const char *path, char *buffer, int max_size)
{
FILE *fp;
int r = 0;
if (!(fp = fopen(path, "r"))) {
log_sys_error("fopen", path);
return 0;
}
if (!fgets(buffer, max_size, fp))
log_sys_error("fgets", path);
else
r = 1;
if (fclose(fp))
log_sys_error("fclose", path);
return r;
}
static int _get_sysfs_dm_mpath(struct dev_types *dt, const char *sysfs_dir, const char *holder_name)
{
char path[PATH_MAX];
char buffer[128];
if (dm_snprintf(path, sizeof(path), "%sblock/%s/dm/uuid", sysfs_dir, holder_name) < 0) {
log_error("Sysfs path string is too long.");
return 0;
}
buffer[0] = '\0';
if (!_get_sysfs_string(path, buffer, sizeof(buffer)))
return_0;
if (!strncmp(buffer, MPATH_PREFIX, 6))
return 1;
return 0;
}
static int _get_holder_name(const char *dir, char *name, int max_size)
{
struct dirent *d;
DIR *dr;
int r = 0;
if (!(dr = opendir(dir))) {
log_sys_error("opendir", dir);
return 0;
}
*name = '\0';
while ((d = readdir(dr))) {
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
/* There should be only one holder if it is multipath */
if (*name) {
r = 0;
break;
}
strncpy(name, d->d_name, max_size);
r = 1;
}
if (closedir(dr))
log_sys_debug("closedir", dir);
return r;
}
#ifdef UDEV_SYNC_SUPPORT
static int _udev_dev_is_mpath_component(struct device *dev)
{
const char *value;
struct dev_ext *ext;
if (!(ext = dev_ext_get(dev)))
return_0;
value = udev_device_get_property_value((struct udev_device *)ext->handle, DEV_EXT_UDEV_BLKID_TYPE);
if (value && !strcmp(value, DEV_EXT_UDEV_BLKID_TYPE_MPATH))
return 1;
value = udev_device_get_property_value((struct udev_device *)ext->handle, DEV_EXT_UDEV_MPATH_DEVICE_PATH);
if (value && !strcmp(value, "1"))
return 1;
return 0;
}
#else
static int _udev_dev_is_mpath_component(struct device *dev)
{
return 0;
}
#endif
static int _native_dev_is_mpath_component(struct cmd_context *cmd, struct dev_filter *f, struct device *dev)
{
struct mpath_priv *mp = (struct mpath_priv *) f->private;
struct dev_types *dt = mp->dt;
const char *part_name;
const char *name; /* e.g. "sda" for "/dev/sda" */
char link_path[PATH_MAX]; /* some obscure, unpredictable sysfs path */
char holders_path[PATH_MAX]; /* e.g. "/sys/block/sda/holders/" */
char dm_dev_path[PATH_MAX]; /* e.g. "/dev/dm-1" */
char holder_name[256]; /* e.g. "dm-1" */
const char *sysfs_dir = dm_sysfs_dir();
int dev_major = MAJOR(dev->dev);
int dev_minor = MINOR(dev->dev);
int dm_dev_major;
int dm_dev_minor;
struct stat info;
dev_t primary_dev;
long look;
/* Limit this filter to SCSI or NVME devices */
if (!major_is_scsi_device(dt, dev_major) && !dev_is_nvme(dt, dev))
return 0;
switch (dev_get_primary_dev(dt, dev, &primary_dev)) {
case 2: /* The dev is partition. */
part_name = dev_name(dev); /* name of original dev for log_debug msg */
/* gets "foo" for "/dev/foo" where "/dev/foo" comes from major:minor */
if (!(name = _get_sysfs_name_by_devt(sysfs_dir, primary_dev, link_path, sizeof(link_path))))
return_0;
log_debug_devs("%s: Device is a partition, using primary "
"device %s for mpath component detection",
part_name, name);
break;
case 1: /* The dev is already a primary dev. Just continue with the dev. */
/* gets "foo" for "/dev/foo" */
if (!(name = _get_sysfs_name(dev)))
return_0;
break;
default: /* 0, error. */
log_warn("Failed to get primary device for %d:%d.", dev_major, dev_minor);
return 0;
}
if (dm_snprintf(holders_path, sizeof(holders_path), "%sblock/%s/holders", sysfs_dir, name) < 0) {
log_warn("Sysfs path to check mpath is too long.");
return 0;
}
/* also will filter out partitions */
if (stat(holders_path, &info))
return 0;
if (!S_ISDIR(info.st_mode)) {
log_warn("Path %s is not a directory.", holders_path);
return 0;
}
/*
* If holders dir contains an entry such as "dm-1", then this sets
* holder_name to "dm-1".
*
* If holders dir is empty, return 0 (this is generally where
* devs that are not mpath components return.)
*/
if (!_get_holder_name(holders_path, holder_name, sizeof(holder_name)))
return 0;
if (dm_snprintf(dm_dev_path, sizeof(dm_dev_path), "%s/%s", cmd->dev_dir, holder_name) < 0) {
log_warn("dm device path to check mpath is too long.");
return 0;
}
/*
* stat "/dev/dm-1" which is the holder of the dev we're checking
* dm_dev_major:dm_dev_minor come from stat("/dev/dm-1")
*/
if (stat(dm_dev_path, &info)) {
log_debug("filter-mpath %s holder %s stat result %d",
dev_name(dev), dm_dev_path, errno);
return 0;
}
dm_dev_major = (int)MAJOR(info.st_rdev);
dm_dev_minor = (int)MINOR(info.st_rdev);
if (dm_dev_major != dt->device_mapper_major) {
log_debug_devs("filter-mpath %s holder %s %d:%d does not have dm major",
dev_name(dev), dm_dev_path, dm_dev_major, dm_dev_minor);
return 0;
}
/*
* Save the result of checking that "/dev/dm-1" is an mpath device
* to avoid repeating it for each path component.
* The minor number of "/dev/dm-1" is added to the hash table with
* const value 2 meaning that dm minor 1 (for /dev/dm-1) is a multipath dev
* and const value 1 meaning that dm minor 1 is not a multipath dev.
*/
look = (long) dm_hash_lookup_binary(mp->hash, &dm_dev_minor, sizeof(dm_dev_minor));
if (look > 0) {
log_debug_devs("filter-mpath %s holder %s %u:%u already checked as %sbeing mpath.",
dev_name(dev), holder_name, dm_dev_major, dm_dev_minor, (look > 1) ? "" : "not ");
return (look > 1) ? 1 : 0;
}
/*
* Returns 1 if /sys/block/<holder_name>/dm/uuid indicates that
* <holder_name> is a dm device with dm uuid prefix mpath-.
* When true, <holder_name> will be something like "dm-1".
*
* (Is a hash table worth it to avoid reading one sysfs file?)
*/
if (_get_sysfs_dm_mpath(dt, sysfs_dir, holder_name)) {
log_debug_devs("filter-mpath %s holder %s %u:%u ignore mpath component",
dev_name(dev), holder_name, dm_dev_major, dm_dev_minor);
(void) dm_hash_insert_binary(mp->hash, &dm_dev_minor, sizeof(dm_dev_minor), (void*)2);
return 1;
}
(void) dm_hash_insert_binary(mp->hash, &dm_dev_minor, sizeof(dm_dev_minor), (void*)1);
return 0;
}
static int _dev_is_mpath_component(struct cmd_context *cmd, struct dev_filter *f, struct device *dev)
{
if (dev->ext.src == DEV_EXT_NONE)
return _native_dev_is_mpath_component(cmd, f, dev);
if (dev->ext.src == DEV_EXT_UDEV)
return _udev_dev_is_mpath_component(dev);
log_error(INTERNAL_ERROR "Missing hook for mpath recognition "
"using external device info source %s", dev_ext_name(dev));
return 0;
}
#define MSG_SKIPPING "%s: Skipping mpath component device"
static int _ignore_mpath_component(struct cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name)
{
dev->filtered_flags &= ~DEV_FILTERED_MPATH_COMPONENT;
if (_dev_is_mpath_component(cmd, f, dev) == 1) {
if (dev->ext.src == DEV_EXT_NONE)
log_debug_devs(MSG_SKIPPING, dev_name(dev));
else
log_debug_devs(MSG_SKIPPING " [%s:%p]", dev_name(dev),
dev_ext_name(dev), dev->ext.handle);
if (dev_is_mpath_component(cmd, dev)) {
log_debug_devs("%s: Skipping mpath component device", dev_name(dev));
dev->filtered_flags |= DEV_FILTERED_MPATH_COMPONENT;
return 0;
}
@ -353,59 +37,33 @@ static int _ignore_mpath_component(struct cmd_context *cmd, struct dev_filter *f
static void _destroy(struct dev_filter *f)
{
struct mpath_priv *mp = (struct mpath_priv*) f->private;
if (f->use_count)
log_error(INTERNAL_ERROR "Destroying mpath filter while in use %u times.", f->use_count);
dm_hash_destroy(mp->hash);
dm_pool_destroy(mp->mem);
}
struct dev_filter *mpath_filter_create(struct dev_types *dt)
{
struct dev_filter *f;
const char *sysfs_dir = dm_sysfs_dir();
struct mpath_priv *mp;
struct dm_pool *mem;
struct dm_hash_table *hash;
if (!*sysfs_dir) {
log_verbose("No proc filesystem found: skipping multipath filter");
return NULL;
}
if (!(hash = dm_hash_create(110))) {
log_error("mpath hash table creation failed.");
if (!(f = zalloc(sizeof(*f)))) {
log_error("mpath filter allocation failed");
return NULL;
}
if (!(mem = dm_pool_create("mpath", 256))) {
log_error("mpath pool creation failed.");
dm_hash_destroy(hash);
return NULL;
}
if (!(mp = dm_pool_zalloc(mem, sizeof(*mp)))) {
log_error("mpath filter allocation failed.");
goto bad;
}
mp->f.passes_filter = _ignore_mpath_component;
mp->f.destroy = _destroy;
mp->f.use_count = 0;
mp->f.private = mp;
mp->f.name = "mpath";
mp->dt = dt;
mp->mem = mem;
mp->hash = hash;
f->passes_filter = _ignore_mpath_component;
f->destroy = _destroy;
f->use_count = 0;
f->name = "mpath";
log_debug_devs("mpath filter initialised.");
return &mp->f;
bad:
dm_pool_destroy(mem);
dm_hash_destroy(hash);
return NULL;
return f;
}
#else

4
lib/filters/filter-partitioned.c
View File

@ -22,7 +22,6 @@
static int _passes_partitioned_filter(struct cmd_context *cmd, struct dev_filter *f, struct device *dev, const char *use_filter_name)
{
struct dev_types *dt = (struct dev_types *) f->private;
int ret;
if (cmd->filter_nodata_only)
@ -30,7 +29,7 @@ static int _passes_partitioned_filter(struct cmd_context *cmd, struct dev_filter
dev->filtered_flags &= ~DEV_FILTERED_PARTITIONED;
ret = dev_is_partitioned(dt, dev);
ret = dev_is_partitioned(cmd, dev);
if (ret == -EAGAIN) {
/* let pass, call again after scan */
@ -72,7 +71,6 @@ struct dev_filter *partitioned_filter_create(struct dev_types *dt)
f->passes_filter = _passes_partitioned_filter;
f->destroy = _partitioned_filter_destroy;
f->use_count = 0;
f->private = dt;
f->name = "partitioned";
log_debug_devs("Partitioned filter initialised.");

2
lib/filters/filter.h
View File

@ -20,7 +20,7 @@
#include "lib/device/dev-cache.h"
#include "lib/device/dev-type.h"
struct dev_filter *composite_filter_create(int n, int use_dev_ext_info, struct dev_filter **filters);
struct dev_filter *composite_filter_create(int n, struct dev_filter **filters);
struct dev_filter *lvm_type_filter_create(struct dev_types *dt);
struct dev_filter *md_filter_create(struct cmd_context *cmd, struct dev_types *dt);

14
lib/misc/lvm-wrappers.c
View File

@ -25,19 +25,29 @@ struct udev *_udev;
int udev_init_library_context(void)
{
if (_udev)
udev_unref(_udev);
return 1;
if (getenv("DM_DISABLE_UDEV"))
return 0;
if (!(_udev = udev_new())) {
log_error("Failed to create udev library context.");
return 0;
}
if (!udev_is_running()) {
udev_unref(_udev);
_udev = NULL;
return 0;
}
return 1;
}
void udev_fin_library_context(void)
{
udev_unref(_udev);
if (_udev)
udev_unref(_udev);
_udev = NULL;
}

14
tools/lvmcmdline.c
View File

@ -3228,6 +3228,11 @@ int lvm_run_command(struct cmd_context *cmd, int argc, char **argv)
_init_md_checks(cmd);
if (!dev_mpath_init(find_config_tree_str_allow_empty(cmd, devices_multipath_wwids_file_CFG, NULL))) {
ret = ECMD_FAILED;
goto_out;
}
if (!_cmd_no_meta_proc(cmd) && !_init_lvmlockd(cmd)) {
ret = ECMD_FAILED;
goto_out;
@ -3248,6 +3253,7 @@ int lvm_run_command(struct cmd_context *cmd, int argc, char **argv)
out:
dev_mpath_exit();
hints_exit(cmd);
lvmcache_destroy(cmd, 1, 1);
label_scan_destroy(cmd);
@ -3541,9 +3547,6 @@ struct cmd_context *init_lvm(unsigned set_connections,
{
struct cmd_context *cmd;
if (!udev_init_library_context())
stack;
/*
* It's not necessary to use name mangling for LVM:
* - the character set used for LV names is subset of udev character set
@ -3551,9 +3554,7 @@ struct cmd_context *init_lvm(unsigned set_connections,
*/
dm_set_name_mangling_mode(DM_STRING_MANGLING_NONE);
if (!(cmd = create_toolcontext(0, NULL, 1, threaded,
set_connections, set_filters))) {
udev_fin_library_context();
if (!(cmd = create_toolcontext(0, NULL, 1, threaded, set_connections, set_filters))) {
return_NULL;
}
@ -3561,7 +3562,6 @@ struct cmd_context *init_lvm(unsigned set_connections,
if (stored_errno()) {
destroy_toolcontext(cmd);
udev_fin_library_context();
return_NULL;
}

12
tools/pvscan.c
View File

@ -1193,16 +1193,6 @@ static int _online_devs(struct cmd_context *cmd, int do_all, struct dm_list *pvs
log_debug("online_devs %s %s", dev_name(dev), dev->pvid);
/*
* This should already have been done by the filter, but make
* another check directly with udev in case the filter was not
* using udev and the native version didn't catch it.
*/
if (udev_dev_is_mpath_component(dev)) {
log_print("pvscan[%d] ignore multipath component %s.", getpid(), dev_name(dev));
continue;
}
if (!(info = lvmcache_info_from_pvid(dev->pvid, dev, 0))) {
if (!do_all)
log_print("pvscan[%d] ignore %s with no lvm info.", getpid(), dev_name(dev));
@ -1257,7 +1247,7 @@ static int _online_devs(struct cmd_context *cmd, int do_all, struct dm_list *pvs
if (pv->device_hint && !strncmp(pv->device_hint, "/dev/md", 7))
do_full_check = 1;
}
if (do_full_check && dev_is_md_component(dev, NULL, 1)) {
if (do_full_check && dev_is_md_component(cmd, dev, NULL, 1)) {
log_print("pvscan[%d] ignore md component %s.", getpid(), dev_name(dev));
release_vg(vg);
continue;