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lvm2/lib/device/dev-type.c

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2001-09-25 16:49:28 +04:00
/*
* Copyright (C) 2013 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,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
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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,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
#include "base/memory/zalloc.h"
#include "lib/misc/lib.h"
#include "lib/device/dev-type.h"
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#include "lib/device/device-types.h"
#include "lib/mm/xlate.h"
#include "lib/config/config.h"
#include "lib/metadata/metadata.h"
#include "lib/device/bcache.h"
#include "lib/label/label.h"
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#ifdef BLKID_WIPING_SUPPORT
#include <blkid.h>
#endif
#ifdef UDEV_SYNC_SUPPORT
#include <libudev.h>
#include "lib/device/dev-ext-udev-constants.h"
#endif
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#include <libgen.h>
#include <ctype.h>
/*
* dev is pmem if /sys/dev/block/<major>:<minor>/queue/dax is 1
*/
int dev_is_pmem(struct device *dev)
{
FILE *fp;
char path[PATH_MAX];
int is_pmem = 0;
if (dm_snprintf(path, sizeof(path), "%sdev/block/%d:%d/queue/dax",
dm_sysfs_dir(),
(int) MAJOR(dev->dev),
(int) MINOR(dev->dev)) < 0) {
log_warn("Sysfs path for %s dax is too long.", dev_name(dev));
return 0;
}
if (!(fp = fopen(path, "r")))
return 0;
if (fscanf(fp, "%d", &is_pmem) != 1)
log_warn("Failed to parse DAX %s.", path);
if (is_pmem)
log_debug("%s is pmem", dev_name(dev));
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if (fclose(fp))
log_sys_debug("fclose", path);
return is_pmem ? 1 : 0;
}
int dev_is_lv(struct device *dev)
{
FILE *fp;
char path[PATH_MAX];
char buffer[64];
int ret = 0;
if (dm_snprintf(path, sizeof(path), "%sdev/block/%d:%d/dm/uuid",
dm_sysfs_dir(),
(int) MAJOR(dev->dev),
(int) MINOR(dev->dev)) < 0) {
log_warn("Sysfs dm uuid path for %s is too long.", dev_name(dev));
return 0;
}
if (!(fp = fopen(path, "r")))
return 0;
if (!fgets(buffer, sizeof(buffer), fp))
log_debug("Failed to read %s.", path);
else if (!strncmp(buffer, "LVM-", 4))
ret = 1;
if (fclose(fp))
log_sys_debug("fclose", path);
return ret;
}
struct dev_types *create_dev_types(const char *proc_dir,
const struct dm_config_node *cn)
{
struct dev_types *dt;
char line[80];
char proc_devices[PATH_MAX];
FILE *pd = NULL;
int i, j = 0;
int line_maj = 0;
int blocksection = 0;
size_t dev_len = 0;
const struct dm_config_value *cv;
const char *name;
char *nl;
if (!(dt = zalloc(sizeof(struct dev_types)))) {
log_error("Failed to allocate device type register.");
return NULL;
}
if (!*proc_dir) {
log_verbose("No proc filesystem found: using all block device types");
for (i = 0; i < NUMBER_OF_MAJORS; i++)
dt->dev_type_array[i].max_partitions = 1;
return dt;
}
if (dm_snprintf(proc_devices, sizeof(proc_devices),
"%s/devices", proc_dir) < 0) {
log_error("Failed to create /proc/devices string");
goto bad;
}
if (!(pd = fopen(proc_devices, "r"))) {
log_sys_error("fopen", proc_devices);
goto bad;
}
while (fgets(line, sizeof(line), pd) != NULL) {
i = 0;
while (line[i] == ' ')
i++;
/* If it's not a number it may be name of section */
line_maj = atoi(line + i);
if (line_maj < 0 || line_maj >= NUMBER_OF_MAJORS) {
/*
* Device numbers shown in /proc/devices are actually direct
* numbers passed to registering function, however the kernel
* uses only 12 bits, so use just 12 bits for major.
*/
if ((nl = strchr(line, '\n'))) *nl = '\0';
log_warn("WARNING: /proc/devices line: %s, replacing major with %d.",
line, line_maj & (NUMBER_OF_MAJORS - 1));
line_maj &= (NUMBER_OF_MAJORS - 1);
}
if (!line_maj) {
blocksection = (line[i] == 'B') ? 1 : 0;
continue;
}
/* We only want block devices ... */
if (!blocksection)
continue;
/* Find the start of the device major name */
while (line[i] != ' ' && line[i] != '\0')
i++;
while (line[i] == ' ')
i++;
/* Look for md device */
if (!strncmp("md", line + i, 2) && isspace(*(line + i + 2)))
dt->md_major = line_maj;
/* Look for blkext device */
if (!strncmp("blkext", line + i, 6) && isspace(*(line + i + 6)))
dt->blkext_major = line_maj;
/* Look for drbd device */
if (!strncmp("drbd", line + i, 4) && isspace(*(line + i + 4)))
dt->drbd_major = line_maj;
/* Look for DASD */
if (!strncmp("dasd", line + i, 4) && isspace(*(line + i + 4)))
dt->dasd_major = line_maj;
/* Look for EMC powerpath */
if (!strncmp("emcpower", line + i, 8) && isspace(*(line + i + 8)))
dt->emcpower_major = line_maj;
/* Look for Veritas Dynamic Multipathing */
if (!strncmp("VxDMP", line + i, 5) && isspace(*(line + i + 5)))
dt->vxdmp_major = line_maj;
if (!strncmp("loop", line + i, 4) && isspace(*(line + i + 4)))
dt->loop_major = line_maj;
if (!strncmp("power2", line + i, 6) && isspace(*(line + i + 6)))
dt->power2_major = line_maj;
/* Look for device-mapper device */
/* FIXME Cope with multiple majors */
if (!strncmp("device-mapper", line + i, 13) && isspace(*(line + i + 13)))
dt->device_mapper_major = line_maj;
/* Major is SCSI device */
if (!strncmp("sd", line + i, 2) && isspace(*(line + i + 2)))
dt->dev_type_array[line_maj].flags |= PARTITION_SCSI_DEVICE;
/* Go through the valid device names and if there is a
match store max number of partitions */
for (j = 0; _dev_known_types[j].name[0]; j++) {
dev_len = strlen(_dev_known_types[j].name);
if (dev_len <= strlen(line + i) &&
!strncmp(_dev_known_types[j].name, line + i, dev_len) &&
(line_maj < NUMBER_OF_MAJORS)) {
dt->dev_type_array[line_maj].max_partitions =
_dev_known_types[j].max_partitions;
break;
}
}
if (!cn)
continue;
/* Check devices/types for local variations */
for (cv = cn->v; cv; cv = cv->next) {
if (cv->type != DM_CFG_STRING) {
log_error("Expecting string in devices/types "
"in config file");
if (fclose(pd))
log_sys_error("fclose", proc_devices);
goto bad;
}
dev_len = strlen(cv->v.str);
name = cv->v.str;
cv = cv->next;
if (!cv || cv->type != DM_CFG_INT) {
log_error("Max partition count missing for %s "
"in devices/types in config file",
name);
if (fclose(pd))
log_sys_error("fclose", proc_devices);
goto bad;
}
if (!cv->v.i) {
log_error("Zero partition count invalid for "
"%s in devices/types in config file",
name);
if (fclose(pd))
log_sys_error("fclose", proc_devices);
goto bad;
}
if (dev_len <= strlen(line + i) &&
!strncmp(name, line + i, dev_len) &&
(line_maj < NUMBER_OF_MAJORS)) {
dt->dev_type_array[line_maj].max_partitions = cv->v.i;
break;
}
}
}
if (fclose(pd))
log_sys_error("fclose", proc_devices);
return dt;
bad:
free(dt);
return NULL;
}
int dev_subsystem_part_major(struct dev_types *dt, struct device *dev)
{
dev_t primary_dev;
if (MAJOR(dev->dev) == dt->device_mapper_major)
return 1;
if (MAJOR(dev->dev) == dt->md_major)
return 1;
if (MAJOR(dev->dev) == dt->drbd_major)
return 1;
if (MAJOR(dev->dev) == dt->emcpower_major)
return 1;
if (MAJOR(dev->dev) == dt->power2_major)
return 1;
if (MAJOR(dev->dev) == dt->vxdmp_major)
return 1;
if ((MAJOR(dev->dev) == dt->blkext_major) &&
dev_get_primary_dev(dt, dev, &primary_dev) &&
(MAJOR(primary_dev) == dt->md_major))
return 1;
return 0;
}
const char *dev_subsystem_name(struct dev_types *dt, struct device *dev)
{
devices: improve handling of duplicate PVs Example: /dev/loop0 and /dev/loop1 are duplicates, created by copying one backing file to the other. 'identity /dev/loopX' creates an identity mapping for loopX named idmloopX, which adds a duplicate for the named device. The duplicate selection code for lvmetad is incomplete, and lvmetad is disabled for this example. [~]# losetup -f loopfile0 [~]# pvs PV VG Fmt Attr PSize PFree /dev/loop0 foo lvm2 a-- 308.00m 296.00m [~]# losetup -f loopfile1 [~]# pvs Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/loop1 not /dev/loop0 Using duplicate PV /dev/loop1 which is more recent, replacing /dev/loop0 PV VG Fmt Attr PSize PFree /dev/loop1 foo lvm2 a-- 308.00m 308.00m [~]# ./identity /dev/loop0 [~]# pvs Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/loop1 not /dev/loop0 Using duplicate PV /dev/loop1 without holders, replacing /dev/loop0 Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/mapper/idmloop0 not /dev/loop1 Using duplicate PV /dev/mapper/idmloop0 from subsystem DM, replacing /dev/loop1 PV VG Fmt Attr PSize PFree /dev/mapper/idmloop0 foo lvm2 a-- 308.00m 296.00m [~]# ./identity /dev/loop1 [~]# pvs WARNING: duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV is being used from both devices /dev/loop0 and /dev/loop1 Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/loop1 not /dev/loop0 Using duplicate PV /dev/loop1 which is more recent, replacing /dev/loop0 Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/mapper/idmloop0 not /dev/loop1 Using duplicate PV /dev/mapper/idmloop0 from subsystem DM, replacing /dev/loop1 Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/mapper/idmloop1 not /dev/mapper/idmloop0 Using duplicate PV /dev/mapper/idmloop1 which is more recent, replacing /dev/mapper/idmloop0 PV VG Fmt Attr PSize PFree /dev/mapper/idmloop1 foo lvm2 a-- 308.00m 308.00m
2015-04-24 22:58:58 +03:00
if (MAJOR(dev->dev) == dt->device_mapper_major)
return "DM";
if (MAJOR(dev->dev) == dt->md_major)
return "MD";
if (MAJOR(dev->dev) == dt->drbd_major)
return "DRBD";
if (MAJOR(dev->dev) == dt->dasd_major)
return "DASD";
if (MAJOR(dev->dev) == dt->emcpower_major)
return "EMCPOWER";
if (MAJOR(dev->dev) == dt->power2_major)
return "POWER2";
if (MAJOR(dev->dev) == dt->vxdmp_major)
return "VXDMP";
if (MAJOR(dev->dev) == dt->blkext_major)
return "BLKEXT";
if (MAJOR(dev->dev) == dt->loop_major)
return "LOOP";
return "";
}
int major_max_partitions(struct dev_types *dt, int major)
{
if (major >= NUMBER_OF_MAJORS)
return 0;
return dt->dev_type_array[major].max_partitions;
}
int major_is_scsi_device(struct dev_types *dt, int major)
{
if (major >= NUMBER_OF_MAJORS)
return 0;
return (dt->dev_type_array[major].flags & PARTITION_SCSI_DEVICE) ? 1 : 0;
}
static int _loop_is_with_partscan(struct device *dev)
{
FILE *fp;
int partscan = 0;
char path[PATH_MAX];
char buffer[64];
if (dm_snprintf(path, sizeof(path), "%sdev/block/%d:%d/loop/partscan",
dm_sysfs_dir(),
(int) MAJOR(dev->dev),
(int) MINOR(dev->dev)) < 0) {
log_warn("Sysfs path for partscan is too long.");
return 0;
}
if (!(fp = fopen(path, "r")))
return 0; /* not there -> no partscan */
if (!fgets(buffer, sizeof(buffer), fp)) {
log_warn("Failed to read %s.", path);
} else if (sscanf(buffer, "%d", &partscan) != 1) {
log_warn("Failed to parse %s '%s'.", path, buffer);
partscan = 0;
}
if (fclose(fp))
log_sys_debug("fclose", path);
return partscan;
}
/* See linux/genhd.h and fs/partitions/msdos */
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#define PART_MAGIC 0xAA55
#define PART_MAGIC_OFFSET UINT64_C(0x1FE)
#define PART_OFFSET UINT64_C(0x1BE)
struct partition {
2008-01-30 17:00:02 +03:00
uint8_t boot_ind;
uint8_t head;
uint8_t sector;
uint8_t cyl;
uint8_t sys_ind; /* partition type */
uint8_t end_head;
uint8_t end_sector;
uint8_t end_cyl;
uint32_t start_sect;
uint32_t nr_sects;
} __attribute__((packed));
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static int _is_partitionable(struct dev_types *dt, struct device *dev)
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{
int parts = major_max_partitions(dt, MAJOR(dev->dev));
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if (MAJOR(dev->dev) == dt->device_mapper_major)
return 1;
/* All MD devices are partitionable via blkext (as of 2.6.28) */
if (MAJOR(dev->dev) == dt->md_major)
return 1;
/* All loop devices are partitionable via blkext (as of 3.2) */
if ((MAJOR(dev->dev) == dt->loop_major) &&
_loop_is_with_partscan(dev))
return 1;
if ((parts <= 1) || (MINOR(dev->dev) % parts))
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return 0;
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return 1;
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}
static int _has_partition_table(struct device *dev)
{
int ret = 0;
unsigned p;
struct {
uint8_t skip[PART_OFFSET];
struct partition part[4];
uint16_t magic;
} __attribute__((packed)) buf; /* sizeof() == SECTOR_SIZE */
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if (!dev_read_bytes(dev, UINT64_C(0), sizeof(buf), &buf))
return_0;
/* FIXME Check for other types of partition table too */
/* Check for msdos partition table */
if (buf.magic == xlate16(PART_MAGIC)) {
for (p = 0; p < 4; ++p) {
/* Table is invalid if boot indicator not 0 or 0x80 */
if (buf.part[p].boot_ind & 0x7f) {
ret = 0;
break;
}
/* Must have at least one non-empty partition */
if (buf.part[p].nr_sects)
ret = 1;
}
}
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return ret;
}
#ifdef UDEV_SYNC_SUPPORT
static int _udev_dev_is_partitioned(struct dev_types *dt, struct device *dev)
{
struct dev_ext *ext;
struct udev_device *device;
const char *value;
if (!(ext = dev_ext_get(dev)))
return_0;
device = (struct udev_device *) ext->handle;
if (!(value = udev_device_get_property_value(device, DEV_EXT_UDEV_BLKID_PART_TABLE_TYPE)))
return 0;
/*
* Device-mapper devices have DEV_EXT_UDEV_BLKID_PART_TABLE_TYPE
* variable set if there's partition table found on whole device.
* Partitions do not have this variable set - it's enough to use
* only this variable to decide whether this device has partition
* table on it.
*/
if (MAJOR(dev->dev) == dt->device_mapper_major)
return 1;
/*
* Other devices have DEV_EXT_UDEV_BLKID_PART_TABLE_TYPE set for
* *both* whole device and partitions. We need to look at the
* DEV_EXT_UDEV_DEVTYPE in addition to decide - whole device
* with partition table on it has this variable set to
* DEV_EXT_UDEV_DEVTYPE_DISK.
*/
if (!(value = udev_device_get_property_value(device, DEV_EXT_UDEV_DEVTYPE)))
return_0;
return !strcmp(value, DEV_EXT_UDEV_DEVTYPE_DISK);
}
#else
static int _udev_dev_is_partitioned(struct dev_types *dt, struct device *dev)
{
return 0;
}
#endif
static int _native_dev_is_partitioned(struct dev_types *dt, struct device *dev)
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{
int r;
if (!scan_bcache)
return -EAGAIN;
if (!_is_partitionable(dt, dev))
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return 0;
/* Unpartitioned DASD devices are not supported. */
if ((MAJOR(dev->dev) == dt->dasd_major) && dasd_is_cdl_formatted(dev))
return 1;
r = _has_partition_table(dev);
return r;
}
int dev_is_partitioned(struct dev_types *dt, struct device *dev)
{
if (dev->ext.src == DEV_EXT_NONE)
return _native_dev_is_partitioned(dt, dev);
if (dev->ext.src == DEV_EXT_UDEV)
return _udev_dev_is_partitioned(dt, dev);
log_error(INTERNAL_ERROR "Missing hook for partition table recognition "
"using external device info source %s", dev_ext_name(dev));
return 0;
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}
/*
* Get primary dev for the dev supplied.
*
* We can get a primary device for a partition either by:
* A: knowing the number of partitions allowed for the dev and also
* which major:minor number represents the primary and partition device
* (by using the dev_types->dev_type_array)
* B: by the existence of the 'partition' sysfs attribute
* (/dev/block/<major>:<minor>/partition)
*
* Method A is tried first, then method B as a fallback if A fails.
*
* N.B. Method B can only do the decision based on the pure existence of
* the 'partition' sysfs item. There's no direct scan for partition
* tables whatsoever!
*
* Returns:
* 0 on error
* 1 if the dev is already a primary dev, primary dev in 'result'
* 2 if the dev is a partition, primary dev in 'result'
*/
int dev_get_primary_dev(struct dev_types *dt, struct device *dev, dev_t *result)
{
const char *sysfs_dir = dm_sysfs_dir();
int major = (int) MAJOR(dev->dev);
int minor = (int) MINOR(dev->dev);
char path[PATH_MAX];
char temp_path[PATH_MAX];
char buffer[64];
struct stat info;
FILE *fp = NULL;
int parts, residue, size, ret = 0;
/*
* Try to get the primary dev out of the
* list of known device types first.
*/
if ((parts = dt->dev_type_array[major].max_partitions) > 1) {
if ((residue = minor % parts)) {
*result = MKDEV(major, (minor - residue));
ret = 2;
} else {
*result = dev->dev;
ret = 1; /* dev is not a partition! */
}
goto out;
}
/*
* If we can't get the primary dev out of the list of known device
* types, try to look at sysfs directly then. This is more complex
* way and it also requires certain sysfs layout to be present
* which might not be there in old kernels!
*/
/* check if dev is a partition */
if (dm_snprintf(path, sizeof(path), "%s/dev/block/%d:%d/partition",
sysfs_dir, major, minor) < 0) {
log_error("dm_snprintf partition failed");
goto out;
}
if (stat(path, &info) == -1) {
if (errno != ENOENT)
log_sys_error("stat", path);
*result = dev->dev;
ret = 1;
goto out; /* dev is not a partition! */
}
/*
* extract parent's path from the partition's symlink, e.g.:
* - readlink /sys/dev/block/259:0 = ../../block/md0/md0p1
* - dirname ../../block/md0/md0p1 = ../../block/md0
* - basename ../../block/md0/md0 = md0
* Parent's 'dev' sysfs attribute = /sys/block/md0/dev
*/
if ((size = readlink(dirname(path), temp_path, sizeof(temp_path) - 1)) < 0) {
log_sys_error("readlink", path);
goto out;
}
temp_path[size] = '\0';
if (dm_snprintf(path, sizeof(path), "%s/block/%s/dev",
sysfs_dir, basename(dirname(temp_path))) < 0) {
log_error("dm_snprintf dev failed");
goto out;
}
/* finally, parse 'dev' attribute and create corresponding dev_t */
if (!(fp = fopen(path, "r"))) {
if (errno == ENOENT)
log_error("sysfs file %s does not exist.", path);
else
log_sys_error("fopen", path);
goto out;
}
if (!fgets(buffer, sizeof(buffer), fp)) {
log_sys_error("fgets", path);
goto out;
}
if (sscanf(buffer, "%d:%d", &major, &minor) != 2) {
log_error("sysfs file %s not in expected MAJ:MIN format: %s",
path, buffer);
goto out;
}
*result = MKDEV(major, minor);
ret = 2;
out:
if (fp && fclose(fp))
log_sys_error("fclose", path);
return ret;
}
Allow dm-integrity to be used for raid images dm-integrity stores checksums of the data written to an LV, and returns an error if data read from the LV does not match the previously saved checksum. When used on raid images, dm-raid will correct the error by reading the block from another image, and the device user sees no error. The integrity metadata (checksums) are stored on an internal LV allocated by lvm for each linear image. The internal LV is allocated on the same PV as the image. Create a raid LV with an integrity layer over each raid image (for raid levels 1,4,5,6,10): lvcreate --type raidN --raidintegrity y [options] Add an integrity layer to images of an existing raid LV: lvconvert --raidintegrity y LV Remove the integrity layer from images of a raid LV: lvconvert --raidintegrity n LV Settings Use --raidintegritymode journal|bitmap (journal is default) to configure the method used by dm-integrity to ensure crash consistency. Initialization When integrity is added to an LV, the kernel needs to initialize the integrity metadata/checksums for all blocks in the LV. The data corruption checking performed by dm-integrity will only operate on areas of the LV that are already initialized. The progress of integrity initialization is reported by the "syncpercent" LV reporting field (and under the Cpy%Sync lvs column.) Example: create a raid1 LV with integrity: $ lvcreate --type raid1 -m1 --raidintegrity y -n rr -L1G foo Creating integrity metadata LV rr_rimage_0_imeta with size 12.00 MiB. Logical volume "rr_rimage_0_imeta" created. Creating integrity metadata LV rr_rimage_1_imeta with size 12.00 MiB. Logical volume "rr_rimage_1_imeta" created. Logical volume "rr" created. $ lvs -a foo LV VG Attr LSize Origin Cpy%Sync rr foo rwi-a-r--- 1.00g 4.93 [rr_rimage_0] foo gwi-aor--- 1.00g [rr_rimage_0_iorig] 41.02 [rr_rimage_0_imeta] foo ewi-ao---- 12.00m [rr_rimage_0_iorig] foo -wi-ao---- 1.00g [rr_rimage_1] foo gwi-aor--- 1.00g [rr_rimage_1_iorig] 39.45 [rr_rimage_1_imeta] foo ewi-ao---- 12.00m [rr_rimage_1_iorig] foo -wi-ao---- 1.00g [rr_rmeta_0] foo ewi-aor--- 4.00m [rr_rmeta_1] foo ewi-aor--- 4.00m
2019-11-21 01:07:27 +03:00
#ifdef BLKID_WIPING_SUPPORT
int get_fs_block_size(struct device *dev, uint32_t *fs_block_size)
{
2020-06-11 20:43:07 +03:00
char *block_size_str = NULL;
Allow dm-integrity to be used for raid images dm-integrity stores checksums of the data written to an LV, and returns an error if data read from the LV does not match the previously saved checksum. When used on raid images, dm-raid will correct the error by reading the block from another image, and the device user sees no error. The integrity metadata (checksums) are stored on an internal LV allocated by lvm for each linear image. The internal LV is allocated on the same PV as the image. Create a raid LV with an integrity layer over each raid image (for raid levels 1,4,5,6,10): lvcreate --type raidN --raidintegrity y [options] Add an integrity layer to images of an existing raid LV: lvconvert --raidintegrity y LV Remove the integrity layer from images of a raid LV: lvconvert --raidintegrity n LV Settings Use --raidintegritymode journal|bitmap (journal is default) to configure the method used by dm-integrity to ensure crash consistency. Initialization When integrity is added to an LV, the kernel needs to initialize the integrity metadata/checksums for all blocks in the LV. The data corruption checking performed by dm-integrity will only operate on areas of the LV that are already initialized. The progress of integrity initialization is reported by the "syncpercent" LV reporting field (and under the Cpy%Sync lvs column.) Example: create a raid1 LV with integrity: $ lvcreate --type raid1 -m1 --raidintegrity y -n rr -L1G foo Creating integrity metadata LV rr_rimage_0_imeta with size 12.00 MiB. Logical volume "rr_rimage_0_imeta" created. Creating integrity metadata LV rr_rimage_1_imeta with size 12.00 MiB. Logical volume "rr_rimage_1_imeta" created. Logical volume "rr" created. $ lvs -a foo LV VG Attr LSize Origin Cpy%Sync rr foo rwi-a-r--- 1.00g 4.93 [rr_rimage_0] foo gwi-aor--- 1.00g [rr_rimage_0_iorig] 41.02 [rr_rimage_0_imeta] foo ewi-ao---- 12.00m [rr_rimage_0_iorig] foo -wi-ao---- 1.00g [rr_rimage_1] foo gwi-aor--- 1.00g [rr_rimage_1_iorig] 39.45 [rr_rimage_1_imeta] foo ewi-ao---- 12.00m [rr_rimage_1_iorig] foo -wi-ao---- 1.00g [rr_rmeta_0] foo ewi-aor--- 4.00m [rr_rmeta_1] foo ewi-aor--- 4.00m
2019-11-21 01:07:27 +03:00
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if ((block_size_str = blkid_get_tag_value(NULL, "BLOCK_SIZE", dev_name(dev)))) {
*fs_block_size = (uint32_t)atoi(block_size_str);
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free(block_size_str);
log_debug("Found blkid BLOCK_SIZE %u for fs on %s", *fs_block_size, dev_name(dev));
return 1;
} else {
log_debug("No blkid BLOCK_SIZE for fs on %s", dev_name(dev));
*fs_block_size = 0;
return 0;
Allow dm-integrity to be used for raid images dm-integrity stores checksums of the data written to an LV, and returns an error if data read from the LV does not match the previously saved checksum. When used on raid images, dm-raid will correct the error by reading the block from another image, and the device user sees no error. The integrity metadata (checksums) are stored on an internal LV allocated by lvm for each linear image. The internal LV is allocated on the same PV as the image. Create a raid LV with an integrity layer over each raid image (for raid levels 1,4,5,6,10): lvcreate --type raidN --raidintegrity y [options] Add an integrity layer to images of an existing raid LV: lvconvert --raidintegrity y LV Remove the integrity layer from images of a raid LV: lvconvert --raidintegrity n LV Settings Use --raidintegritymode journal|bitmap (journal is default) to configure the method used by dm-integrity to ensure crash consistency. Initialization When integrity is added to an LV, the kernel needs to initialize the integrity metadata/checksums for all blocks in the LV. The data corruption checking performed by dm-integrity will only operate on areas of the LV that are already initialized. The progress of integrity initialization is reported by the "syncpercent" LV reporting field (and under the Cpy%Sync lvs column.) Example: create a raid1 LV with integrity: $ lvcreate --type raid1 -m1 --raidintegrity y -n rr -L1G foo Creating integrity metadata LV rr_rimage_0_imeta with size 12.00 MiB. Logical volume "rr_rimage_0_imeta" created. Creating integrity metadata LV rr_rimage_1_imeta with size 12.00 MiB. Logical volume "rr_rimage_1_imeta" created. Logical volume "rr" created. $ lvs -a foo LV VG Attr LSize Origin Cpy%Sync rr foo rwi-a-r--- 1.00g 4.93 [rr_rimage_0] foo gwi-aor--- 1.00g [rr_rimage_0_iorig] 41.02 [rr_rimage_0_imeta] foo ewi-ao---- 12.00m [rr_rimage_0_iorig] foo -wi-ao---- 1.00g [rr_rimage_1] foo gwi-aor--- 1.00g [rr_rimage_1_iorig] 39.45 [rr_rimage_1_imeta] foo ewi-ao---- 12.00m [rr_rimage_1_iorig] foo -wi-ao---- 1.00g [rr_rmeta_0] foo ewi-aor--- 4.00m [rr_rmeta_1] foo ewi-aor--- 4.00m
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}
}
#else
int get_fs_block_size(struct device *dev, uint32_t *fs_block_size)
{
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log_debug("Disabled blkid BLOCK_SIZE for fs.");
Allow dm-integrity to be used for raid images dm-integrity stores checksums of the data written to an LV, and returns an error if data read from the LV does not match the previously saved checksum. When used on raid images, dm-raid will correct the error by reading the block from another image, and the device user sees no error. The integrity metadata (checksums) are stored on an internal LV allocated by lvm for each linear image. The internal LV is allocated on the same PV as the image. Create a raid LV with an integrity layer over each raid image (for raid levels 1,4,5,6,10): lvcreate --type raidN --raidintegrity y [options] Add an integrity layer to images of an existing raid LV: lvconvert --raidintegrity y LV Remove the integrity layer from images of a raid LV: lvconvert --raidintegrity n LV Settings Use --raidintegritymode journal|bitmap (journal is default) to configure the method used by dm-integrity to ensure crash consistency. Initialization When integrity is added to an LV, the kernel needs to initialize the integrity metadata/checksums for all blocks in the LV. The data corruption checking performed by dm-integrity will only operate on areas of the LV that are already initialized. The progress of integrity initialization is reported by the "syncpercent" LV reporting field (and under the Cpy%Sync lvs column.) Example: create a raid1 LV with integrity: $ lvcreate --type raid1 -m1 --raidintegrity y -n rr -L1G foo Creating integrity metadata LV rr_rimage_0_imeta with size 12.00 MiB. Logical volume "rr_rimage_0_imeta" created. Creating integrity metadata LV rr_rimage_1_imeta with size 12.00 MiB. Logical volume "rr_rimage_1_imeta" created. Logical volume "rr" created. $ lvs -a foo LV VG Attr LSize Origin Cpy%Sync rr foo rwi-a-r--- 1.00g 4.93 [rr_rimage_0] foo gwi-aor--- 1.00g [rr_rimage_0_iorig] 41.02 [rr_rimage_0_imeta] foo ewi-ao---- 12.00m [rr_rimage_0_iorig] foo -wi-ao---- 1.00g [rr_rimage_1] foo gwi-aor--- 1.00g [rr_rimage_1_iorig] 39.45 [rr_rimage_1_imeta] foo ewi-ao---- 12.00m [rr_rimage_1_iorig] foo -wi-ao---- 1.00g [rr_rmeta_0] foo ewi-aor--- 4.00m [rr_rmeta_1] foo ewi-aor--- 4.00m
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*fs_block_size = 0;
return 0;
}
#endif
#ifdef BLKID_WIPING_SUPPORT
static inline int _type_in_flag_list(const char *type, uint32_t flag_list)
{
return (((flag_list & TYPE_LVM2_MEMBER) && !strcmp(type, "LVM2_member")) ||
((flag_list & TYPE_LVM1_MEMBER) && !strcmp(type, "LVM1_member")) ||
((flag_list & TYPE_DM_SNAPSHOT_COW) && !strcmp(type, "DM_snapshot_cow")));
}
#define MSG_FAILED_SIG_OFFSET "Failed to get offset of the %s signature on %s."
#define MSG_FAILED_SIG_LENGTH "Failed to get length of the %s signature on %s."
#define MSG_WIPING_SKIPPED " Wiping skipped."
static int _blkid_wipe(blkid_probe probe, struct device *dev, const char *name,
uint32_t types_to_exclude, uint32_t types_no_prompt,
int yes, force_t force)
{
static const char _msg_wiping[] = "Wiping %s signature on %s.";
const char *offset = NULL, *type = NULL, *magic = NULL,
*usage = NULL, *label = NULL, *uuid = NULL;
loff_t offset_value;
size_t len;
if (!blkid_probe_lookup_value(probe, "TYPE", &type, NULL)) {
if (_type_in_flag_list(type, types_to_exclude))
return 2;
if (blkid_probe_lookup_value(probe, "SBMAGIC_OFFSET", &offset, NULL)) {
if (force < DONT_PROMPT) {
log_error(MSG_FAILED_SIG_OFFSET, type, name);
return 0;
}
log_error("WARNING: " MSG_FAILED_SIG_OFFSET MSG_WIPING_SKIPPED, type, name);
return 2;
}
if (blkid_probe_lookup_value(probe, "SBMAGIC", &magic, &len)) {
if (force < DONT_PROMPT) {
log_error(MSG_FAILED_SIG_LENGTH, type, name);
return 0;
}
log_warn("WARNING: " MSG_FAILED_SIG_LENGTH MSG_WIPING_SKIPPED, type, name);
return 2;
}
} else if (!blkid_probe_lookup_value(probe, "PTTYPE", &type, NULL)) {
if (blkid_probe_lookup_value(probe, "PTMAGIC_OFFSET", &offset, NULL)) {
if (force < DONT_PROMPT) {
log_error(MSG_FAILED_SIG_OFFSET, type, name);
return 0;
}
log_warn("WARNING: " MSG_FAILED_SIG_OFFSET MSG_WIPING_SKIPPED, type, name);
return 2;
}
if (blkid_probe_lookup_value(probe, "PTMAGIC", &magic, &len)) {
if (force < DONT_PROMPT) {
log_error(MSG_FAILED_SIG_LENGTH, type, name);
return 0;
}
log_warn("WARNING: " MSG_FAILED_SIG_LENGTH MSG_WIPING_SKIPPED, type, name);
return 2;
}
usage = "partition table";
} else
return_0;
offset_value = strtoll(offset, NULL, 10);
if (!usage)
(void) blkid_probe_lookup_value(probe, "USAGE", &usage, NULL);
(void) blkid_probe_lookup_value(probe, "LABEL", &label, NULL);
(void) blkid_probe_lookup_value(probe, "UUID", &uuid, NULL);
/* Return values ignored here, in the worst case we print NULL */
log_verbose("Found existing signature on %s at offset %s: LABEL=\"%s\" "
"UUID=\"%s\" TYPE=\"%s\" USAGE=\"%s\"",
name, offset, label, uuid, type, usage);
if (!_type_in_flag_list(type, types_no_prompt)) {
if (!yes && (force == PROMPT) &&
yes_no_prompt("WARNING: %s signature detected on %s at offset %s. "
"Wipe it? [y/n]: ", type, name, offset) == 'n') {
log_error("Aborted wiping of %s.", type);
return 0;
}
2014-02-10 00:33:36 +04:00
log_print_unless_silent(_msg_wiping, type, name);
} else
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log_verbose(_msg_wiping, type, name);
if (!dev_write_zeros(dev, offset_value, len)) {
log_error("Failed to wipe %s signature on %s.", type, name);
return 0;
}
return 1;
}
static int _wipe_known_signatures_with_blkid(struct device *dev, const char *name,
uint32_t types_to_exclude,
uint32_t types_no_prompt,
int yes, force_t force, int *wiped)
{
blkid_probe probe = NULL;
int found = 0, left = 0, wiped_tmp;
int r_wipe;
int r = 0;
if (!wiped)
wiped = &wiped_tmp;
*wiped = 0;
/* TODO: Should we check for valid dev - _dev_is_valid(dev)? */
if (!(probe = blkid_new_probe_from_filename(dev_name(dev)))) {
log_error("Failed to create a new blkid probe for device %s.", dev_name(dev));
goto out;
}
blkid_probe_enable_partitions(probe, 1);
blkid_probe_set_partitions_flags(probe, BLKID_PARTS_MAGIC);
blkid_probe_enable_superblocks(probe, 1);
blkid_probe_set_superblocks_flags(probe, BLKID_SUBLKS_LABEL |
BLKID_SUBLKS_UUID |
BLKID_SUBLKS_TYPE |
BLKID_SUBLKS_USAGE |
BLKID_SUBLKS_VERSION |
BLKID_SUBLKS_MAGIC |
BLKID_SUBLKS_BADCSUM);
while (!blkid_do_probe(probe)) {
if ((r_wipe = _blkid_wipe(probe, dev, name, types_to_exclude, types_no_prompt, yes, force)) == 1) {
(*wiped)++;
if (blkid_probe_step_back(probe)) {
log_error("Failed to step back blkid probe to check just wiped signature.");
goto out;
}
}
/* do not count excluded types */
if (r_wipe != 2)
found++;
}
if (!found)
r = 1;
left = found - *wiped;
if (!left)
r = 1;
else
log_warn("%d existing signature%s left on the device.",
left, left > 1 ? "s" : "");
out:
if (probe)
blkid_free_probe(probe);
return r;
}
#endif /* BLKID_WIPING_SUPPORT */
static int _wipe_signature(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 wipe;
uint64_t offset_found;
wipe = signature_detection_fn(dev, &offset_found, 1);
if (wipe == -1) {
log_error("Fatal error while trying to detect %s on %s.",
type, name);
return 0;
}
if (wipe == 0)
return 1;
/* Specifying --yes => do not ask. */
if (!yes && (force == PROMPT) &&
yes_no_prompt("WARNING: %s detected on %s. Wipe it? [y/n]: ",
type, name) == 'n') {
log_error("Aborted wiping of %s.", type);
return 0;
}
log_print_unless_silent("Wiping %s on %s.", type, name);
if (!dev_write_zeros(dev, offset_found, wipe_len)) {
log_error("Failed to wipe %s on %s.", type, name);
return 0;
}
(*wiped)++;
return 1;
}
static int _wipe_known_signatures_with_lvm(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)
{
int wiped_tmp;
if (!wiped)
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))
return 0;
return 1;
}
int wipe_known_signatures(struct cmd_context *cmd, struct device *dev,
const char *name, uint32_t types_to_exclude,
uint32_t types_no_prompt, int yes, force_t force,
int *wiped)
{
int blkid_wiping_enabled = find_config_tree_bool(cmd, allocation_use_blkid_wiping_CFG, NULL);
#ifdef BLKID_WIPING_SUPPORT
if (blkid_wiping_enabled)
return _wipe_known_signatures_with_blkid(dev, name,
types_to_exclude,
types_no_prompt,
yes, force, wiped);
#endif
if (blkid_wiping_enabled) {
log_warn("allocation/use_blkid_wiping=1 configuration setting is set "
"while LVM is not compiled with blkid wiping support.");
log_warn("Falling back to native LVM signature detection.");
}
return _wipe_known_signatures_with_lvm(dev, name,
types_to_exclude,
types_no_prompt,
yes, force, wiped);
}
#ifdef __linux__
static int _snprintf_attr(char *buf, size_t buf_size, const char *sysfs_dir,
const char *attribute, dev_t dev)
{
if (dm_snprintf(buf, buf_size, "%s/dev/block/%d:%d/%s", sysfs_dir,
(int)MAJOR(dev), (int)MINOR(dev),
attribute) < 0) {
log_warn("dm_snprintf %s failed.", attribute);
return 0;
}
return 1;
}
static unsigned long _dev_topology_attribute(struct dev_types *dt,
const char *attribute,
struct device *dev,
unsigned long default_value)
{
const char *sysfs_dir = dm_sysfs_dir();
char path[PATH_MAX], buffer[64];
FILE *fp;
struct stat info;
dev_t uninitialized_var(primary);
unsigned long result = default_value;
unsigned long value = 0UL;
if (!attribute || !*attribute)
goto_out;
if (!sysfs_dir || !*sysfs_dir)
goto_out;
if (!_snprintf_attr(path, sizeof(path), sysfs_dir, attribute, dev->dev))
goto_out;
/*
* check if the desired sysfs attribute exists
* - if not: either the kernel doesn't have topology support
* or the device could be a partition
*/
if (stat(path, &info) == -1) {
if (errno != ENOENT) {
log_sys_debug("stat", path);
goto out;
}
if (!dev_get_primary_dev(dt, dev, &primary))
goto out;
/* get attribute from partition's primary device */
if (!_snprintf_attr(path, sizeof(path), sysfs_dir, attribute, primary))
goto_out;
if (stat(path, &info) == -1) {
if (errno != ENOENT)
log_sys_debug("stat", path);
goto out;
}
}
if (!(fp = fopen(path, "r"))) {
log_sys_debug("fopen", path);
goto out;
}
if (!fgets(buffer, sizeof(buffer), fp)) {
log_sys_debug("fgets", path);
goto out_close;
}
if (sscanf(buffer, "%lu", &value) != 1) {
log_warn("sysfs file %s not in expected format: %s", path, buffer);
goto out_close;
}
log_very_verbose("Device %s: %s is %lu%s.",
dev_name(dev), attribute, value, default_value ? "" : " bytes");
result = value >> SECTOR_SHIFT;
if (!result && value) {
2016-03-11 03:19:16 +03:00
log_warn("WARNING: Device %s: %s is %lu and is unexpectedly less than sector.",
dev_name(dev), attribute, value);
result = 1;
}
out_close:
if (fclose(fp))
log_sys_debug("fclose", path);
out:
return result;
}
unsigned long dev_alignment_offset(struct dev_types *dt, struct device *dev)
{
return _dev_topology_attribute(dt, "alignment_offset", dev, 0UL);
}
unsigned long dev_minimum_io_size(struct dev_types *dt, struct device *dev)
{
return _dev_topology_attribute(dt, "queue/minimum_io_size", dev, 0UL);
}
unsigned long dev_optimal_io_size(struct dev_types *dt, struct device *dev)
{
return _dev_topology_attribute(dt, "queue/optimal_io_size", dev, 0UL);
}
unsigned long dev_discard_max_bytes(struct dev_types *dt, struct device *dev)
{
return _dev_topology_attribute(dt, "queue/discard_max_bytes", dev, 0UL);
}
unsigned long dev_discard_granularity(struct dev_types *dt, struct device *dev)
{
return _dev_topology_attribute(dt, "queue/discard_granularity", dev, 0UL);
}
int dev_is_rotational(struct dev_types *dt, struct device *dev)
{
return (int) _dev_topology_attribute(dt, "queue/rotational", dev, 1UL);
}
#else
int dev_get_primary_dev(struct dev_types *dt, struct device *dev, dev_t *result)
{
return 0;
}
unsigned long dev_alignment_offset(struct dev_types *dt, struct device *dev)
{
return 0UL;
}
unsigned long dev_minimum_io_size(struct dev_types *dt, struct device *dev)
{
return 0UL;
}
unsigned long dev_optimal_io_size(struct dev_types *dt, struct device *dev)
{
return 0UL;
}
unsigned long dev_discard_max_bytes(struct dev_types *dt, struct device *dev)
{
return 0UL;
}
unsigned long dev_discard_granularity(struct dev_types *dt, struct device *dev)
{
return 0UL;
}
int dev_is_rotational(struct dev_types *dt, struct device *dev)
{
return 1;
}
#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()) {
dev->flags |= DEV_UDEV_INFO_MISSING;
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)
{
dev->flags |= DEV_UDEV_INFO_MISSING;
return 0;
}
#endif