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812c699c8d
slightly different from the current LVM1 method.
lvcreate --persistent y --minor 10 (to specify when created)
lvchange --persistent n (to turn off)
lvchange --persistent y --minor 11 (to change)
--persistent uses a new LV status flag stored on disk
minor number is stored on disk the same way as LVM1 does
(but major number stored is 0; any LVM1 major/minor setting gets lost)
lvchange -ay --minor 12 (to activate using minor 12, regardless of the
on-disk setting, which doesn't get changed)
--minor == -m
--persistent == -M
329 lines
7.9 KiB
C
329 lines
7.9 KiB
C
/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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*
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* This file is released under the LGPL.
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*
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* This is the in core representation of a volume group and its
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* associated physical and logical volumes.
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*/
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#ifndef _LVM_METADATA_H
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#define _LVM_METADATA_H
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#include <sys/types.h>
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#include <asm/page.h>
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#include "dev-cache.h"
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#include "list.h"
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#include "uuid.h"
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#define NAME_LEN 128
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#define MAX_STRIPES 128
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#define SECTOR_SIZE 512
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#define STRIPE_SIZE_DEFAULT 16 /* 16KB */
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#define STRIPE_SIZE_MIN ( PAGE_SIZE/SECTOR_SIZE) /* PAGESIZE in sectors */
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#define STRIPE_SIZE_MAX ( 512L * 1024 / SECTOR_SIZE) /* 512 KB in sectors */
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/* Various flags */
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/* Note that the bits no longer necessarily correspond to LVM1 disk format */
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#define EXPORTED_VG 0x00000002 /* VG PV */
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#define RESIZEABLE_VG 0x00000004 /* VG */
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#define PARTIAL_VG 0x00000040 /* VG */
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/* May any free extents on this PV be used or must they be left free? */
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#define ALLOCATABLE_PV 0x00000008 /* PV */
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#define SPINDOWN_LV 0x00000010 /* LV */
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#define BADBLOCK_ON 0x00000020 /* LV */
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#define FIXED_MINOR 0x00000080 /* LV */
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/* FIXME: do we really set read/write for a whole vg ? */
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#define LVM_READ 0x00000100 /* LV VG */
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#define LVM_WRITE 0x00000200 /* LV VG */
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#define CLUSTERED 0x00000400 /* VG */
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#define SHARED 0x00000800 /* VG */
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/* FIXME: This should be an enum rather than a bitset,
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remove from status - EJT */
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#define ALLOC_SIMPLE 0x00001000 /* LV */
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#define ALLOC_STRICT 0x00002000 /* LV */
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#define ALLOC_CONTIGUOUS 0x00004000 /* LV */
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#define SNAPSHOT 0x00010000 /* LV */
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#define SNAPSHOT_ORG 0x00020000 /* LV */
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struct physical_volume {
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struct id id;
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struct device *dev;
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char *vg_name;
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uint32_t status;
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uint64_t size;
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/* physical extents */
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uint64_t pe_size;
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uint64_t pe_start;
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uint32_t pe_count;
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uint32_t pe_allocated; /* FIXME: change the name to alloc_count ? */
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};
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struct cmd_context;
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struct volume_group {
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struct cmd_context *cmd;
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struct id id;
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char *name;
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char *system_id;
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uint32_t status;
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uint32_t extent_size;
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uint32_t extent_count;
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uint32_t free_count;
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uint32_t max_lv;
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uint32_t max_pv;
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/* physical volumes */
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uint32_t pv_count;
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struct list pvs;
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/* logical volumes */
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uint32_t lv_count;
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struct list lvs;
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};
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struct stripe_segment {
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struct list list;
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struct logical_volume *lv;
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uint32_t le;
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uint32_t len;
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uint32_t stripe_size;
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uint32_t stripes;
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/* There will be one area for each stripe */
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struct {
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struct physical_volume *pv;
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uint32_t pe;
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} area[0];
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};
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struct logical_volume {
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struct id id;
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char *name;
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struct volume_group *vg;
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uint32_t status;
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uint32_t read_ahead;
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int32_t minor;
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uint64_t size;
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uint32_t le_count;
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struct list segments;
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};
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struct name_list {
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struct list list;
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char *name;
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};
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struct pv_list {
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struct list list;
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struct physical_volume *pv;
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};
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struct lv_list {
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struct list list;
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struct logical_volume *lv;
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};
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struct cmd_context {
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/* format handler allocates all objects from here */
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struct pool *mem;
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/* misc. vars needed by format handler */
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char *dev_dir;
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struct dev_filter *filter;
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struct config_file *cf;
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};
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struct format_instance {
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struct cmd_context *cmd;
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struct format_handler *ops;
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void *private;
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};
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/*
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* Ownership of objects passes to caller.
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*/
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struct format_handler {
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/*
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* Returns a name_list of vg's.
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*/
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struct list *(*get_vgs)(struct format_instance *fi);
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/*
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* Returns pv_list of fully-populated pv structures.
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*/
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struct list *(*get_pvs)(struct format_instance *fi);
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/*
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* Return PV with given path.
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*/
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struct physical_volume *(*pv_read)(struct format_instance *fi,
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const char *pv_name);
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/*
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* Tweak an already filled out a pv ready for importing into a
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* vg. eg. pe_count is format specific.
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*/
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int (*pv_setup)(struct format_instance *fi, struct physical_volume *pv,
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struct volume_group *vg);
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/*
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* Write a PV structure to disk. Fails if the PV is in a VG ie
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* pv->vg_name must be null.
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*/
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int (*pv_write)(struct format_instance *fi,
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struct physical_volume *pv);
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/*
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* Tweak an already filled out a lv eg, check there
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* aren't too many extents.
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*/
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int (*lv_setup)(struct format_instance *fi, struct logical_volume *lv);
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/*
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* Tweak an already filled out vg. eg, max_pv is format
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* specific.
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*/
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int (*vg_setup)(struct format_instance *fi, struct volume_group *vg);
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/*
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* The name may be prefixed with the dev_dir from the
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* job_context.
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*/
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struct volume_group *(*vg_read)(struct format_instance *fi,
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const char *vg_name);
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/*
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* Write out complete VG metadata. You must ensure internal
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* consistency before calling. eg. PEs can't refer to PVs not
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* part of the VG.
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*
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* It is also the responsibility of the caller to ensure external
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* consistency, eg by calling pv_write() if removing PVs from
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* a VG or calling vg_write() a second time if splitting a VG
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* into two.
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*
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* vg_write() must not read or write from any PVs not included
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* in the volume_group structure it is handed. Note: format1
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* does read all pv's currently.
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*/
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int (*vg_write)(struct format_instance *fi, struct volume_group *vg);
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/*
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* Destructor for this object.
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*/
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void (*destroy)(struct format_instance *fi);
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};
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/*
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* Utility functions
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*/
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struct physical_volume *pv_create(struct format_instance *fi,
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const char *name,
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struct id *id);
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struct volume_group *vg_create(struct format_instance *fi, const char *name,
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uint32_t extent_size, int max_pv, int max_lv,
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int pv_count, char **pv_names);
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/*
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* This needs the format instance to check the
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* pv's are orphaned.
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*/
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int vg_extend(struct format_instance *fi,
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struct volume_group *vg, int pv_count, char **pv_names);
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/*
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* Create a new LV within a given volume group.
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*
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*/
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struct logical_volume *lv_create(struct format_instance *fi,
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const char *name,
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uint32_t status,
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uint32_t stripes,
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uint32_t stripe_size,
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uint32_t extents,
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struct volume_group *vg,
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struct list *acceptable_pvs);
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int lv_reduce(struct format_instance *fi,
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struct logical_volume *lv, uint32_t extents);
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int lv_extend(struct format_instance *fi,
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struct logical_volume *lv,
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uint32_t stripes,
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uint32_t stripe_size,
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uint32_t extents,
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struct list *allocatable_pvs);
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/* lv must be part of vg->lvs */
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int lv_remove(struct volume_group *vg, struct logical_volume *lv);
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/* FIXME: Move to other files */
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int id_eq(struct id *op1, struct id *op2);
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/* Manipulate PV structures */
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int pv_add(struct volume_group *vg, struct physical_volume *pv);
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int pv_remove(struct volume_group *vg, struct physical_volume *pv);
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struct physical_volume *pv_find(struct volume_group *vg,
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const char *pv_name);
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/* Find a PV within a given VG */
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struct pv_list *find_pv_in_vg(struct volume_group *vg, const char *pv_name);
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/* Find an LV within a given VG */
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struct lv_list *find_lv_in_vg(struct volume_group *vg, const char *lv_name);
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/* Return the VG that contains a given LV (based on path given in lv_name) */
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/* or environment var */
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struct volume_group *find_vg_with_lv(const char *lv_name);
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/* FIXME Merge these functions with ones above */
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struct physical_volume *find_pv(struct volume_group *vg, struct device *dev);
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struct logical_volume *find_lv(struct volume_group *vg, const char *lv_name);
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/*
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* Remove a dev_dir if present.
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*/
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const char *strip_dir(const char *vg_name, const char *dir);
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/*
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* Checks that an lv has no gaps or overlapping segments.
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*/
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int lv_check_segments(struct logical_volume *lv);
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/*
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* Sometimes (eg, after an lvextend), it is possible to merge two
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* adjacent segments into a single segment. This function trys
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* to merge as many segments as possible.
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*/
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int lv_merge_segments(struct logical_volume *lv);
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#endif
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