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486 lines
14 KiB
C
486 lines
14 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 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,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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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,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* This is the representation of LVM metadata that is being adapted
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* for library export.
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*/
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#ifndef _LVM_METADATA_EXPORTED_H
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#define _LVM_METADATA_EXPORTED_H
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#include "uuid.h"
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struct physical_volume;
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typedef struct physical_volume pv_t;
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struct volume_group;
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typedef struct volume_group vg_t;
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struct logical_volume;
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struct lv_segment;
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struct pv_segment;
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#define MAX_STRIPES 128U
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#define SECTOR_SHIFT 9L
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#define STRIPE_SIZE_MIN ( (unsigned) lvm_getpagesize() >> SECTOR_SHIFT) /* PAGESIZE in sectors */
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#define STRIPE_SIZE_MAX ( 512L * 1024L >> SECTOR_SHIFT) /* 512 KB in sectors */
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#define STRIPE_SIZE_LIMIT ((UINT_MAX >> 2) + 1)
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#define PV_MIN_SIZE ( 512L * 1024L >> SECTOR_SHIFT) /* 512 KB in sectors */
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#define MAX_RESTRICTED_LVS 255 /* Used by FMT_RESTRICTED_LVIDS */
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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 PARTIAL_VG 0x00000001U /* VG */
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#define EXPORTED_VG 0x00000002U /* VG PV */
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#define RESIZEABLE_VG 0x00000004U /* 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 0x00000008U /* PV */
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//#define SPINDOWN_LV 0x00000010U /* LV */
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//#define BADBLOCK_ON 0x00000020U /* LV */
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#define VISIBLE_LV 0x00000040U /* LV */
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#define FIXED_MINOR 0x00000080U /* LV */
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/* FIXME Remove when metadata restructuring is completed */
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#define SNAPSHOT 0x00001000U /* LV - internal use only */
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#define PVMOVE 0x00002000U /* VG LV SEG */
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#define LOCKED 0x00004000U /* LV */
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#define MIRRORED 0x00008000U /* LV - internal use only */
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//#define VIRTUAL 0x00010000U /* LV - internal use only */
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#define MIRROR_LOG 0x00020000U /* LV */
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#define MIRROR_IMAGE 0x00040000U /* LV */
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#define MIRROR_NOTSYNCED 0x00080000U /* LV */
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//#define ACTIVATE_EXCL 0x00100000U /* LV - internal use only */
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//#define PRECOMMITTED 0x00200000U /* VG - internal use only */
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#define LVM_READ 0x00000100U /* LV VG */
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#define LVM_WRITE 0x00000200U /* LV VG */
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#define CLUSTERED 0x00000400U /* VG */
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//#define SHARED 0x00000800U /* VG */
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/* Format features flags */
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#define FMT_SEGMENTS 0x00000001U /* Arbitrary segment params? */
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#define FMT_MDAS 0x00000002U /* Proper metadata areas? */
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#define FMT_TAGS 0x00000004U /* Tagging? */
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#define FMT_UNLIMITED_VOLS 0x00000008U /* Unlimited PVs/LVs? */
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#define FMT_RESTRICTED_LVIDS 0x00000010U /* LVID <= 255 */
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#define FMT_ORPHAN_ALLOCATABLE 0x00000020U /* Orphan PV allocatable? */
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//#define FMT_PRECOMMIT 0x00000040U /* Supports pre-commit? */
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#define FMT_RESIZE_PV 0x00000080U /* Supports pvresize? */
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#define FMT_UNLIMITED_STRIPESIZE 0x00000100U /* Unlimited stripe size? */
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#define FMT_RESTRICTED_READAHEAD 0x00000200U /* Readahead restricted to 2-120? */
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/* LVM2 external library flags */
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#define CORRECT_INCONSISTENT 0x00000001U /* Correct inconsistent metadata */
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#define FAIL_INCONSISTENT 0x00000002U /* Fail if metadata inconsistent */
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/* Ordered list - see lv_manip.c */
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typedef enum {
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ALLOC_INVALID,
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ALLOC_CONTIGUOUS,
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ALLOC_CLING,
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ALLOC_NORMAL,
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ALLOC_ANYWHERE,
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ALLOC_INHERIT
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} alloc_policy_t;
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typedef enum {
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AREA_UNASSIGNED,
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AREA_PV,
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AREA_LV
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} area_type_t;
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/*
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* Whether or not to force an operation.
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*/
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typedef enum {
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PROMPT = 0, /* Issue yes/no prompt to confirm operation */
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DONT_PROMPT = 1, /* Skip yes/no prompt */
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DONT_PROMPT_OVERRIDE = 2 /* Skip prompt + override a second condition */
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} force_t;
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struct cmd_context;
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struct format_handler;
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struct labeller;
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struct format_type {
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struct list list;
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struct cmd_context *cmd;
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struct format_handler *ops;
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struct labeller *labeller;
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const char *name;
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const char *alias;
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uint32_t features;
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void *library;
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void *private;
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};
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struct pv_segment {
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struct list list; /* Member of pv->segments: ordered list
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* covering entire data area on this PV */
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struct physical_volume *pv;
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uint32_t pe;
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uint32_t len;
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struct lv_segment *lvseg; /* NULL if free space */
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uint32_t lv_area; /* Index to area in LV segment */
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};
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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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const struct format_type *fmt;
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const char *vg_name;
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struct id vgid;
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uint32_t status;
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uint64_t size;
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/* physical extents */
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uint32_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_alloc_count;
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struct list segments; /* Ordered pv_segments covering complete PV */
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struct list tags;
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};
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struct format_instance {
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const struct format_type *fmt;
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struct list metadata_areas; /* e.g. metadata locations */
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void *private;
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};
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struct volume_group {
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struct cmd_context *cmd;
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struct format_instance *fid;
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uint32_t seqno; /* Metadata sequence number */
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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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alloc_policy_t alloc;
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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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uint32_t snapshot_count;
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struct list lvs;
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struct list tags;
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};
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/* There will be one area for each stripe */
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struct lv_segment_area {
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area_type_t type;
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union {
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struct {
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struct pv_segment *pvseg;
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} pv;
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struct {
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struct logical_volume *lv;
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uint32_t le;
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} lv;
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} u;
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};
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struct segment_type;
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struct lv_segment {
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struct list list;
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struct logical_volume *lv;
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const struct segment_type *segtype;
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uint32_t le;
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uint32_t len;
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uint32_t status;
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/* FIXME Fields depend on segment type */
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uint32_t stripe_size;
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uint32_t area_count;
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uint32_t area_len;
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struct logical_volume *origin;
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struct logical_volume *cow;
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struct list origin_list;
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uint32_t chunk_size; /* For snapshots - in sectors */
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uint32_t region_size; /* For mirrors - in sectors */
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uint32_t extents_copied;
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struct logical_volume *log_lv;
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struct lv_segment *mirror_seg;
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struct list tags;
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struct lv_segment_area *areas;
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};
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#define seg_type(seg, s) (seg)->areas[(s)].type
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#define seg_pv(seg, s) (seg)->areas[(s)].u.pv.pvseg->pv
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#define seg_lv(seg, s) (seg)->areas[(s)].u.lv.lv
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struct logical_volume {
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union lvid lvid;
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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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alloc_policy_t alloc;
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uint32_t read_ahead;
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int32_t major;
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int32_t minor;
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uint64_t size; /* Sectors */
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uint32_t le_count;
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uint32_t origin_count;
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struct list snapshot_segs;
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struct lv_segment *snapshot;
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struct list segments;
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struct list tags;
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};
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struct pe_range {
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struct list list;
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uint32_t start; /* PEs */
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uint32_t count; /* PEs */
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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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struct list *mdas; /* Metadata areas */
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struct list *pe_ranges; /* Ranges of PEs e.g. for allocation */
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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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/*
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* Utility functions
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*/
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int vg_write(struct volume_group *vg);
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int vg_commit(struct volume_group *vg);
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int vg_revert(struct volume_group *vg);
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struct volume_group *vg_read(struct cmd_context *cmd, const char *vg_name,
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const char *vgid, int *consistent);
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struct physical_volume *pv_read(struct cmd_context *cmd, const char *pv_name,
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struct list *mdas, uint64_t *label_sector,
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int warnings);
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struct list *get_pvs(struct cmd_context *cmd);
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/* Set full_scan to 1 to re-read every (filtered) device label */
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struct list *get_vgs(struct cmd_context *cmd, int full_scan);
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struct list *get_vgids(struct cmd_context *cmd, int full_scan);
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int pv_write(struct cmd_context *cmd, struct physical_volume *pv,
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struct list *mdas, int64_t label_sector);
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int is_orphan_vg(const char *vg_name);
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int is_orphan(pv_t *pv);
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vg_t *vg_lock_and_read(struct cmd_context *cmd, const char *vg_name,
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uint32_t lock_flags, uint32_t status_flags,
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uint32_t misc_flags);
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/* pe_start and pe_end relate to any existing data so that new metadata
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* areas can avoid overlap */
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pv_t *pv_create(const struct format_type *fmt,
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struct device *dev,
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struct id *id,
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uint64_t size,
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uint64_t pe_start,
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uint32_t existing_extent_count,
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uint32_t existing_extent_size,
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int pvmetadatacopies,
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uint64_t pvmetadatasize, struct list *mdas);
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int pv_resize(struct physical_volume *pv, struct volume_group *vg,
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uint32_t new_pe_count);
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int pv_resize_single(struct cmd_context *cmd,
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struct volume_group *vg,
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struct physical_volume *pv,
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uint64_t new_size);
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int pv_analyze(struct cmd_context *cmd, const char *pv_name,
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uint64_t label_sector);
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/* FIXME: move internal to library */
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uint32_t pv_list_extents_free(const struct list *pvh);
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struct volume_group *vg_create(struct cmd_context *cmd, const char *name,
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uint32_t extent_size, uint32_t max_pv,
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uint32_t max_lv, alloc_policy_t alloc,
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int pv_count, char **pv_names);
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int vg_remove(struct volume_group *vg);
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int vg_remove_single(struct cmd_context *cmd, const char *vg_name,
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struct volume_group *vg, int consistent,
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force_t force);
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int vg_rename(struct cmd_context *cmd, struct volume_group *vg,
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const char *new_name);
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int vg_extend(struct volume_group *vg, int pv_count, char **pv_names);
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int vg_change_pesize(struct cmd_context *cmd, struct volume_group *vg,
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uint32_t new_extent_size);
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int vg_split_mdas(struct cmd_context *cmd, struct volume_group *vg_from,
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struct volume_group *vg_to);
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/* Manipulate LVs */
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struct logical_volume *lv_create_empty(const char *name,
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union lvid *lvid,
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uint32_t status,
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alloc_policy_t alloc,
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int import,
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struct volume_group *vg);
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/* Reduce the size of an LV by extents */
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int lv_reduce(struct logical_volume *lv, uint32_t extents);
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/* Empty an LV prior to deleting it */
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int lv_empty(struct logical_volume *lv);
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/* Entry point for all LV extent allocations */
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int lv_extend(struct logical_volume *lv,
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const struct segment_type *segtype,
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uint32_t stripes, uint32_t stripe_size,
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uint32_t mirrors, uint32_t extents,
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struct physical_volume *mirrored_pv, uint32_t mirrored_pe,
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uint32_t status, struct list *allocatable_pvs,
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alloc_policy_t alloc);
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/* lv must be part of lv->vg->lvs */
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int lv_remove(struct logical_volume *lv);
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int lv_remove_single(struct cmd_context *cmd, struct logical_volume *lv,
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force_t force);
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int lv_rename(struct cmd_context *cmd, struct logical_volume *lv,
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const char *new_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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pv_t *find_pv_in_vg_by_uuid(struct volume_group *vg, struct id *id);
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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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/* FIXME Merge these functions with ones above */
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struct logical_volume *find_lv(struct volume_group *vg, const char *lv_name);
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struct physical_volume *find_pv_by_name(struct cmd_context *cmd,
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const char *pv_name);
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/* Find LV segment containing given LE */
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struct lv_segment *first_seg(struct logical_volume *lv);
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/*
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* Useful functions for managing snapshots.
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*/
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int lv_is_origin(const struct logical_volume *lv);
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int lv_is_cow(const struct logical_volume *lv);
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int lv_is_visible(const struct logical_volume *lv);
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int pv_is_in_vg(struct volume_group *vg, struct physical_volume *pv);
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/* Given a cow LV, return return the snapshot lv_segment that uses it */
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struct lv_segment *find_cow(const struct logical_volume *lv);
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/* Given a cow LV, return its origin */
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struct logical_volume *origin_from_cow(const struct logical_volume *lv);
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int vg_add_snapshot(const char *name,
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struct logical_volume *origin, struct logical_volume *cow,
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union lvid *lvid, uint32_t extent_count,
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uint32_t chunk_size);
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int vg_remove_snapshot(struct logical_volume *cow);
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int vg_check_status(const struct volume_group *vg, uint32_t status);
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/*
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* Mirroring functions
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*/
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struct alloc_handle;
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uint32_t adjusted_mirror_region_size(uint32_t extent_size, uint32_t extents,
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uint32_t region_size);
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int create_mirror_layers(struct alloc_handle *ah,
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uint32_t first_area,
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uint32_t num_mirrors,
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struct logical_volume *lv,
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const struct segment_type *segtype,
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uint32_t status,
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uint32_t region_size,
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struct logical_volume *log_lv);
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int remove_mirror_images(struct lv_segment *mirrored_seg, uint32_t num_mirrors,
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struct list *removable_pvs, unsigned remove_log);
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int reconfigure_mirror_images(struct lv_segment *mirrored_seg, uint32_t num_mirrors,
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struct list *removable_pvs, unsigned remove_log);
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int insert_pvmove_mirrors(struct cmd_context *cmd,
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struct logical_volume *lv_mirr,
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struct list *source_pvl,
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struct logical_volume *lv,
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struct list *allocatable_pvs,
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alloc_policy_t alloc,
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struct list *lvs_changed);
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int remove_pvmove_mirrors(struct volume_group *vg,
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struct logical_volume *lv_mirr);
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struct logical_volume *find_pvmove_lv(struct volume_group *vg,
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struct device *dev, uint32_t lv_type);
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struct logical_volume *find_pvmove_lv_from_pvname(struct cmd_context *cmd,
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struct volume_group *vg,
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const char *name,
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uint32_t lv_type);
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const char *get_pvmove_pvname_from_lv(struct logical_volume *lv);
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const char *get_pvmove_pvname_from_lv_mirr(struct logical_volume *lv_mirr);
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float copy_percent(struct logical_volume *lv_mirr);
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struct list *lvs_using_lv(struct cmd_context *cmd, struct volume_group *vg,
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struct logical_volume *lv);
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uint32_t find_free_lvnum(struct logical_volume *lv);
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char *generate_lv_name(struct volume_group *vg, const char *format,
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char *buffer, size_t len);
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/*
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* Begin skeleton for external LVM library
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*/
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struct device *pv_dev(const pv_t *pv);
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const char *pv_vg_name(const pv_t *pv);
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const char *pv_dev_name(const pv_t *pv);
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uint64_t pv_size(const pv_t *pv);
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uint32_t pv_status(const pv_t *pv);
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uint32_t pv_pe_size(const pv_t *pv);
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uint64_t pv_pe_start(const pv_t *pv);
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uint32_t pv_pe_count(const pv_t *pv);
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uint32_t pv_pe_alloc_count(const pv_t *pv);
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uint32_t vg_status(const vg_t *vg);
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#endif
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