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258 lines
6.1 KiB
C
258 lines
6.1 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 GPL.
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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 "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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/* Various flags */
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/* Note that the bits no longer necessarily correspond to LVM1 disk format */
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#define ACTIVE 0x00000001 /* PV VG LV */
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#define EXPORTED_VG 0x00000002 /* VG */ /* And PV too perhaps? */
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#define EXTENDABLE_VG 0x00000004 /* VG */
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#define ALLOCATED_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 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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#define ALLOC_STRICT 0x00001000 /* LV */
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#define ALLOC_CONTIGUOUS 0x00002000 /* LV */
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#define SNAPSHOT 0x00004000 /* LV */
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#define SNAPSHOT_ORG 0x00008000 /* LV */
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#define EXPORTED_TAG "PV_EXP" /* Identifier of exported PV */
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#define IMPORTED_TAG "PV_IMP" /* Identifier of imported PV */
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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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char *exported;
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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;
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};
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struct pe_specifier {
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struct physical_volume *pv;
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uint32_t pe;
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};
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struct volume_group {
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struct id id;
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char *name;
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uint32_t status;
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uint64_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 logical_volume {
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/* disk */
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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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uint32_t stripes;
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uint64_t size;
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uint32_t le_count;
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/* le -> pe mapping array */
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struct pe_specifier *map;
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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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/*
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* Ownership of objects passes to caller.
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*/
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struct io_space {
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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 io_space *is);
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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 io_space *is);
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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 io_space *is,
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const char *pv_name);
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/*
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* Tweak an already filled out a pv ready
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* for importing into a vg. eg. pe_count
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* is format specific.
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*/
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int (*pv_setup)(struct io_space *is, 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
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* the PV is in a VG ie pv->vg_name must
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* be null.
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*/
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int (*pv_write)(struct io_space *is, struct physical_volume *pv);
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/*
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* Tweak an already filled out vg. eg,
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* max_pv is format specific.
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*/
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int (*vg_setup)(struct io_space *is, struct volume_group *vg);
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/*
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* If vg_name doesn't contain any slash,
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* this function adds prefix.
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*/
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struct volume_group *(*vg_read)(struct io_space *is,
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const char *vg_name);
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/*
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* Write out complete VG metadata. Ensure
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* *internal* consistency before writing
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* anything. eg. PEs can't refer to PVs
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* not part of the VG. Order write sequence
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* to aid recovery if process is aborted
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* (eg flush entire set of changes to each
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* disk in turn) It is the responsibility
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* of the caller to ensure external
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* consistency, eg by calling pv_write()
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* if removing PVs from a VG or calling
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* vg_write() a second time if splitting a
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* VG into two. vg_write() must not read
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* or write from any PVs not included in
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* the volume_group structure it is
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* handed.
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*/
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int (*vg_write)(struct io_space *is, 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 io_space *is);
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/*
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* Current volume group prefix.
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*/
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char *prefix;
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struct pool *mem;
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struct dev_filter *filter;
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void *private;
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};
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/*
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* Utility functions
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*/
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struct volume_group *vg_create(struct io_space *ios, const char *name,
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uint64_t extent_size, int max_pv, int max_lv,
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int pv_count, char **pv_names);
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struct physical_volume *pv_create(struct io_space *ios, const char *name);
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int vg_extend(struct io_space *ios, struct volume_group *vg, int pv_count,
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char **pv_names);
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/* FIXME: Move to other files */
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struct io_space *create_text_format(struct dev_filter *filter,
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const char *text_file);
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int id_eq(struct id *op1, struct id *op2);
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/* Create consistent new empty structures, populated with defaults */
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struct volume_group *vg_create();
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int vg_destroy(struct volume_group *vg);
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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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/* Add an LV to a given VG */
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int lv_add(struct volume_group *vg, struct logical_volume *lv);
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/* Remove an LV from a given VG */
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int lv_remove(struct volume_group *vg, struct list *lvh);
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/* Find a PV within a given VG */
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struct 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 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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#endif
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