mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-21 13:34:40 +03:00
3ae5569570
dm-writecache is used like dm-cache with a standard LV as the cache. $ lvcreate -n main -L 128M -an foo /dev/loop0 $ lvcreate -n fast -L 32M -an foo /dev/pmem0 $ lvconvert --type writecache --cachepool fast foo/main $ lvs -a foo -o+devices LV VG Attr LSize Origin Devices [fast] foo -wi------- 32.00m /dev/pmem0(0) main foo Cwi------- 128.00m [main_wcorig] main_wcorig(0) [main_wcorig] foo -wi------- 128.00m /dev/loop0(0) $ lvchange -ay foo/main $ dmsetup table foo-main_wcorig: 0 262144 linear 7:0 2048 foo-main: 0 262144 writecache p 253:4 253:3 4096 0 foo-fast: 0 65536 linear 259:0 2048 $ lvchange -an foo/main $ lvconvert --splitcache foo/main $ lvs -a foo -o+devices LV VG Attr LSize Devices fast foo -wi------- 32.00m /dev/pmem0(0) main foo -wi------- 128.00m /dev/loop0(0)
98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/*
|
|
* Copyright (C) 2013 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
|
|
*/
|
|
|
|
#ifndef _LVM_DEV_TYPE_H
|
|
#define _LVM_DEV_TYPE_H
|
|
|
|
#include "lib/device/device.h"
|
|
#include "lib/display/display.h"
|
|
#include "lib/label/label.h"
|
|
|
|
#define NUMBER_OF_MAJORS 4096
|
|
|
|
#ifdef __linux__
|
|
# include "libdm/misc/kdev_t.h"
|
|
#else
|
|
# define MAJOR(x) major((x))
|
|
# define MINOR(x) minor((x))
|
|
# define MKDEV(x,y) makedev((x),(y))
|
|
#endif
|
|
|
|
#define PARTITION_SCSI_DEVICE (1 << 0)
|
|
|
|
struct dev_type_def {
|
|
int max_partitions; /* 0 means LVM won't use this major number. */
|
|
int flags;
|
|
};
|
|
|
|
struct dev_types {
|
|
int md_major;
|
|
int blkext_major;
|
|
int drbd_major;
|
|
int device_mapper_major;
|
|
int emcpower_major;
|
|
int vxdmp_major;
|
|
int power2_major;
|
|
int dasd_major;
|
|
int loop_major;
|
|
struct dev_type_def dev_type_array[NUMBER_OF_MAJORS];
|
|
};
|
|
|
|
struct dev_types *create_dev_types(const char *proc_dir, const struct dm_config_node *cn);
|
|
|
|
/* Subsystems */
|
|
int dev_subsystem_part_major(struct dev_types *dt, struct device *dev);
|
|
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(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 dasd_is_cdl_formatted(struct device *dev);
|
|
int udev_dev_is_mpath_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);
|
|
|
|
/* Signature wiping. */
|
|
#define TYPE_LVM1_MEMBER 0x001
|
|
#define TYPE_LVM2_MEMBER 0x002
|
|
#define TYPE_DM_SNAPSHOT_COW 0x004
|
|
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);
|
|
|
|
/* Type-specific device properties */
|
|
unsigned long dev_md_stripe_width(struct dev_types *dt, struct device *dev);
|
|
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_get_primary_dev(struct dev_types *dt, struct device *dev, dev_t *result);
|
|
|
|
/* Various device properties */
|
|
unsigned long dev_alignment_offset(struct dev_types *dt, struct device *dev);
|
|
unsigned long dev_minimum_io_size(struct dev_types *dt, struct device *dev);
|
|
unsigned long dev_optimal_io_size(struct dev_types *dt, struct device *dev);
|
|
unsigned long dev_discard_max_bytes(struct dev_types *dt, struct device *dev);
|
|
unsigned long dev_discard_granularity(struct dev_types *dt, struct device *dev);
|
|
|
|
int dev_is_rotational(struct dev_types *dt, struct device *dev);
|
|
|
|
int dev_is_pmem(struct device *dev);
|
|
|
|
#endif
|