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lvm2/lib/metadata/metadata.h

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* This is the in core representation of a volume group and its
* associated physical and logical volumes.
*/
#ifndef _LVM_METADATA_H
#define _LVM_METADATA_H
#include "ctype.h"
#include "dev-cache.h"
#include "lvm-string.h"
#include "metadata-exported.h"
//#define MAX_STRIPES 128U
//#define SECTOR_SHIFT 9L
#define SECTOR_SIZE ( 1L << SECTOR_SHIFT )
//#define STRIPE_SIZE_MIN ( (unsigned) lvm_getpagesize() >> SECTOR_SHIFT) /* PAGESIZE in sectors */
//#define STRIPE_SIZE_MAX ( 512L * 1024L >> SECTOR_SHIFT) /* 512 KB in sectors */
//#define STRIPE_SIZE_LIMIT ((UINT_MAX >> 2) + 1)
//#define PV_MIN_SIZE ( 512L * 1024L >> SECTOR_SHIFT) /* 512 KB in sectors */
//#define MAX_RESTRICTED_LVS 255 /* Used by FMT_RESTRICTED_LVIDS */
#define MIRROR_LOG_OFFSET 2 /* sectors */
#define VG_MEMPOOL_CHUNK 10240 /* in bytes, hint only */
/*
* Ceiling(n / sz)
*/
#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
/*
* Ceiling(n / size) * size
*/
#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
/* Various flags */
/* Note that the bits no longer necessarily correspond to LVM1 disk format */
//#define PARTIAL_VG 0x00000001U /* VG */
//#define EXPORTED_VG 0x00000002U /* VG PV */
//#define RESIZEABLE_VG 0x00000004U /* VG */
/* May any free extents on this PV be used or must they be left free? */
//#define ALLOCATABLE_PV 0x00000008U /* PV */
#define SPINDOWN_LV 0x00000010U /* LV */
#define BADBLOCK_ON 0x00000020U /* LV */
//#define VISIBLE_LV 0x00000040U /* LV */
//#define FIXED_MINOR 0x00000080U /* LV */
/* FIXME Remove when metadata restructuring is completed */
//#define SNAPSHOT 0x00001000U /* LV - internal use only */
//#define PVMOVE 0x00002000U /* VG LV SEG */
//#define LOCKED 0x00004000U /* LV */
//#define MIRRORED 0x00008000U /* LV - internal use only */
#define VIRTUAL 0x00010000U /* LV - internal use only */
//#define MIRROR_LOG 0x00020000U /* LV */
//#define MIRROR_IMAGE 0x00040000U /* LV */
//#define MIRROR_NOTSYNCED 0x00080000U /* LV */
#define ACTIVATE_EXCL 0x00100000U /* LV - internal use only */
#define PRECOMMITTED 0x00200000U /* VG - internal use only */
//#define CONVERTING 0x00400000U /* LV */
//#define MISSING_PV 0x00800000U /* PV */
//#define PARTIAL_LV 0x01000000U /* LV - derived flag, not
// written out in metadata*/
#define POSTORDER_FLAG 0x02000000U /* Not real flags, reserved for */
#define POSTORDER_OPEN_FLAG 0x04000000U /* temporary use inside vg_read_internal. */
#define VIRTUAL_ORIGIN 0x08000000U /* LV - internal use only */
//#define LVM_READ 0x00000100U /* LV VG */
//#define LVM_WRITE 0x00000200U /* LV VG */
//#define CLUSTERED 0x00000400U /* VG */
#define SHARED 0x00000800U /* VG */
/* Format features flags */
//#define FMT_SEGMENTS 0x00000001U /* Arbitrary segment params? */
//#define FMT_MDAS 0x00000002U /* Proper metadata areas? */
//#define FMT_TAGS 0x00000004U /* Tagging? */
//#define FMT_UNLIMITED_VOLS 0x00000008U /* Unlimited PVs/LVs? */
//#define FMT_RESTRICTED_LVIDS 0x00000010U /* LVID <= 255 */
//#define FMT_ORPHAN_ALLOCATABLE 0x00000020U /* Orphan PV allocatable? */
#define FMT_PRECOMMIT 0x00000040U /* Supports pre-commit? */
//#define FMT_RESIZE_PV 0x00000080U /* Supports pvresize? */
//#define FMT_UNLIMITED_STRIPESIZE 0x00000100U /* Unlimited stripe size? */
struct metadata_area;
/* Per-format per-metadata area operations */
struct metadata_area_ops {
struct volume_group *(*vg_read) (struct format_instance * fi,
const char *vg_name,
struct metadata_area * mda);
struct volume_group *(*vg_read_precommit) (struct format_instance * fi,
const char *vg_name,
struct metadata_area * mda);
/*
* Write out complete VG metadata. You must ensure internal
* consistency before calling. eg. PEs can't refer to PVs not
* part of the VG.
*
* It is also the responsibility of the caller to ensure external
* consistency, eg by calling pv_write() if removing PVs from
* a VG or calling vg_write() a second time if splitting a VG
* into two.
*
* vg_write() should not read or write from any PVs not included
* in the volume_group structure it is handed.
* (format1 currently breaks this rule.)
*/
int (*vg_write) (struct format_instance * fid, struct volume_group * vg,
struct metadata_area * mda);
int (*vg_precommit) (struct format_instance * fid,
struct volume_group * vg,
struct metadata_area * mda);
int (*vg_commit) (struct format_instance * fid,
struct volume_group * vg, struct metadata_area * mda);
int (*vg_revert) (struct format_instance * fid,
struct volume_group * vg, struct metadata_area * mda);
int (*vg_remove) (struct format_instance * fi, struct volume_group * vg,
struct metadata_area * mda);
/*
* Returns number of free sectors in given metadata area.
*/
uint64_t (*mda_free_sectors) (struct metadata_area *mda);
/*
* Returns number of total sectors in given metadata area.
*/
uint64_t (*mda_total_sectors) (struct metadata_area *mda);
/*
* Check if metadata area belongs to vg
*/
int (*mda_in_vg) (struct format_instance * fi,
struct volume_group * vg, struct metadata_area *mda);
/*
* Analyze a metadata area on a PV.
*/
int (*pv_analyze_mda) (const struct format_type * fmt,
struct metadata_area *mda);
};
struct metadata_area {
struct dm_list list;
struct metadata_area_ops *ops;
void *metadata_locn;
};
#define seg_pvseg(seg, s) (seg)->areas[(s)].u.pv.pvseg
#define seg_dev(seg, s) (seg)->areas[(s)].u.pv.pvseg->pv->dev
#define seg_pe(seg, s) (seg)->areas[(s)].u.pv.pvseg->pe
#define seg_le(seg, s) (seg)->areas[(s)].u.lv.le
struct name_list {
struct dm_list list;
char *name;
};
struct mda_list {
struct dm_list list;
struct device_area mda;
};
struct peg_list {
struct dm_list list;
struct pv_segment *peg;
};
struct seg_list {
struct dm_list list;
unsigned count;
struct lv_segment *seg;
};
/*
* Ownership of objects passes to caller.
*/
struct format_handler {
/*
* Scan any metadata areas that aren't referenced in PV labels
*/
int (*scan) (const struct format_type * fmt);
/*
* Return PV with given path.
*/
int (*pv_read) (const struct format_type * fmt, const char *pv_name,
struct physical_volume * pv, struct dm_list *mdas,
int scan_label_only);
/*
* Tweak an already filled out a pv ready for importing into a
* vg. eg. pe_count is format specific.
*/
int (*pv_setup) (const struct format_type * fmt,
uint64_t pe_start, uint32_t extent_count,
uint32_t extent_size, unsigned long data_alignment,
int pvmetadatacopies,
uint64_t pvmetadatasize, struct dm_list * mdas,
struct physical_volume * pv, struct volume_group * vg);
/*
* Write a PV structure to disk. Fails if the PV is in a VG ie
* pv->vg_name must be a valid orphan VG name
*/
int (*pv_write) (const struct format_type * fmt,
struct physical_volume * pv, struct dm_list * mdas,
int64_t label_sector);
/*
* Tweak an already filled out a lv eg, check there
* aren't too many extents.
*/
int (*lv_setup) (struct format_instance * fi,
struct logical_volume * lv);
/*
* Tweak an already filled out vg. eg, max_pv is format
* specific.
*/
int (*vg_setup) (struct format_instance * fi, struct volume_group * vg);
/*
* Check whether particular segment type is supported.
*/
int (*segtype_supported) (struct format_instance *fid,
const struct segment_type *segtype);
/*
* Create format instance with a particular metadata area
*/
struct format_instance *(*create_instance) (const struct format_type *
fmt, const char *vgname,
const char *vgid,
void *context);
/*
* Destructor for format instance
*/
void (*destroy_instance) (struct format_instance * fid);
/*
* Destructor for format type
*/
void (*destroy) (const struct format_type * fmt);
};
/*
* Utility functions
*/
unsigned long set_pe_align(struct physical_volume *pv, unsigned long data_alignment);
int vg_validate(struct volume_group *vg);
int pv_write_orphan(struct cmd_context *cmd, struct physical_volume *pv);
/* Manipulate PV structures */
int pv_add(struct volume_group *vg, struct physical_volume *pv);
int pv_remove(struct volume_group *vg, struct physical_volume *pv);
struct physical_volume *pv_find(struct volume_group *vg, const char *pv_name);
/* Find a PV within a given VG */
int get_pv_from_vg_by_id(const struct format_type *fmt, const char *vg_name,
const char *vgid, const char *pvid,
struct physical_volume *pv);
struct lv_list *find_lv_in_vg_by_lvid(struct volume_group *vg,
const union lvid *lvid);
struct lv_list *find_lv_in_lv_list(const struct dm_list *ll,
const struct logical_volume *lv);
/* Return the VG that contains a given LV (based on path given in lv_name) */
/* or environment var */
struct volume_group *find_vg_with_lv(const char *lv_name);
/* Find LV with given lvid (used during activation) */
struct logical_volume *lv_from_lvid(struct cmd_context *cmd,
const char *lvid_s,
unsigned precommitted);
/* FIXME Merge these functions with ones above */
struct physical_volume *find_pv(struct volume_group *vg, struct device *dev);
struct pv_list *find_pv_in_pv_list(const struct dm_list *pl,
const struct physical_volume *pv);
/* Find LV segment containing given LE */
struct lv_segment *find_seg_by_le(const struct logical_volume *lv, uint32_t le);
/* Find PV segment containing given LE */
struct pv_segment *find_peg_by_pe(const struct physical_volume *pv, uint32_t pe);
/*
* Remove a dev_dir if present.
*/
const char *strip_dir(const char *vg_name, const char *dir);
/*
* Checks that an lv has no gaps or overlapping segments.
* Set complete_vg to perform additional VG level checks.
*/
int check_lv_segments(struct logical_volume *lv, int complete_vg);
/*
* Sometimes (eg, after an lvextend), it is possible to merge two
* adjacent segments into a single segment. This function trys
* to merge as many segments as possible.
*/
int lv_merge_segments(struct logical_volume *lv);
/*
* Ensure there's a segment boundary at a given LE, splitting if necessary
*/
int lv_split_segment(struct logical_volume *lv, uint32_t le);
/*
* Add/remove upward link from underlying LV to the segment using it
* FIXME: ridiculously long name
*/
int add_seg_to_segs_using_this_lv(struct logical_volume *lv, struct lv_segment *seg);
int remove_seg_from_segs_using_this_lv(struct logical_volume *lv, struct lv_segment *seg);
struct lv_segment *get_only_segment_using_this_lv(struct logical_volume *lv);
/*
* Count LVs that are visible from user's perspective.
*/
unsigned displayable_lvs_in_vg(const struct volume_group *vg);
/*
* Count snapshot LVs.
*/
unsigned snapshot_count(const struct volume_group *vg);
/*
* For internal metadata caching.
*/
int export_vg_to_buffer(struct volume_group *vg, char **buf);
struct volume_group *import_vg_from_buffer(char *buf,
struct format_instance *fid);
/*
* Mirroring functions
*/
/*
* Given mirror image or mirror log segment, find corresponding mirror segment
*/
int fixup_imported_mirrors(struct volume_group *vg);
/*
* Begin skeleton for external LVM library
*/
struct id pv_id(const pv_t *pv);
const struct format_type *pv_format_type(const pv_t *pv);
struct id pv_vgid(const pv_t *pv);
pv_t *pv_by_path(struct cmd_context *cmd, const char *pv_name);
int add_pv_to_vg(struct volume_group *vg, const char *pv_name,
struct physical_volume *pv);
#endif
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