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494 lines
16 KiB
C
494 lines
16 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2013 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 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 "ctype.h"
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#include "dev-cache.h"
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#include "lvm-string.h"
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#include "metadata-exported.h"
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//#define MAX_STRIPES 128U
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//#define SECTOR_SHIFT 9L
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//#define SECTOR_SIZE ( 1L << SECTOR_SHIFT )
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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 MAX_RESTRICTED_LVS 255 /* Used by FMT_RESTRICTED_LVIDS */
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#define MIRROR_LOG_OFFSET 2 /* sectors */
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#define VG_MEMPOOL_CHUNK 10240 /* in bytes, hint only */
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/*
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* Ceiling(n / sz)
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*/
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#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
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/*
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* Ceiling(n / size) * size
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*/
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#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
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/* Various flags */
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/* See metadata-exported.h for the complete list. */
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/* Note that the bits no longer necessarily correspond to LVM1 disk format */
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/* May any free extents on this PV be used or must they be left free? */
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#define SPINDOWN_LV UINT64_C(0x00000010) /* LV */
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#define BADBLOCK_ON UINT64_C(0x00000020) /* LV */
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#define VIRTUAL UINT64_C(0x00010000) /* LV - internal use only */
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#define PRECOMMITTED UINT64_C(0x00200000) /* VG - internal use only */
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#define POSTORDER_FLAG UINT64_C(0x02000000) /* Not real flags, reserved for */
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#define POSTORDER_OPEN_FLAG UINT64_C(0x04000000) /* temporary use inside vg_read_internal. */
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#define VIRTUAL_ORIGIN UINT64_C(0x08000000) /* LV - internal use only */
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#define SHARED UINT64_C(0x00000800) /* VG */
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/* Format features flags */
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#define FMT_PRECOMMIT 0x00000040U /* Supports pre-commit? */
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struct dm_config_tree;
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struct metadata_area;
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struct alloc_handle;
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struct lvmcache_info;
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/* Per-format per-metadata area operations */
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struct metadata_area_ops {
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struct dm_list list;
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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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struct metadata_area * mda,
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int single_device);
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struct volume_group *(*vg_read_precommit) (struct format_instance * fi,
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const char *vg_name,
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struct metadata_area * mda);
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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() should not read or write from any PVs not included
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* in the volume_group structure it is handed.
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* (format1 currently breaks this rule.)
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*/
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int (*vg_write) (struct format_instance * fid, struct volume_group * vg,
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struct metadata_area * mda);
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int (*vg_precommit) (struct format_instance * fid,
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struct volume_group * vg,
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struct metadata_area * mda);
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int (*vg_commit) (struct format_instance * fid,
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struct volume_group * vg, struct metadata_area * mda);
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int (*vg_revert) (struct format_instance * fid,
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struct volume_group * vg, struct metadata_area * mda);
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int (*vg_remove) (struct format_instance * fi, struct volume_group * vg,
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struct metadata_area * mda);
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/*
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* Per location copy constructor.
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*/
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void *(*mda_metadata_locn_copy) (struct dm_pool *mem, void *metadata_locn);
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/*
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* Per location description for logging.
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*/
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const char *(*mda_metadata_locn_name) (void *metadata_locn);
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uint64_t (*mda_metadata_locn_offset) (void *metadata_locn);
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/*
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* Returns number of free sectors in given metadata area.
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*/
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uint64_t (*mda_free_sectors) (struct metadata_area *mda);
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/*
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* Returns number of total sectors in given metadata area.
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*/
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uint64_t (*mda_total_sectors) (struct metadata_area *mda);
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/*
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* Check if metadata area belongs to vg
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*/
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int (*mda_in_vg) (struct format_instance * fi,
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struct volume_group * vg, struct metadata_area *mda);
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/*
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* Analyze a metadata area on a PV.
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*/
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int (*pv_analyze_mda) (const struct format_type * fmt,
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struct metadata_area *mda);
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/*
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* Do these two metadata_area structures match with respect to
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* their underlying location?
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*/
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unsigned (*mda_locns_match)(struct metadata_area *mda1,
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struct metadata_area *mda2);
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struct device *(*mda_get_device)(struct metadata_area *mda);
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int (*mda_export_text)(struct metadata_area *mda, struct dm_config_tree *cft,
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struct dm_config_node *parent);
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int (*mda_import_text)(struct lvmcache_info *info, const struct dm_config_node *cn);
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};
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#define MDA_IGNORED 0x00000001
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#define MDA_INCONSISTENT 0x00000002
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#define MDA_FAILED 0x00000004
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struct metadata_area {
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struct dm_list list;
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struct metadata_area_ops *ops;
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void *metadata_locn;
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uint32_t status;
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};
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struct metadata_area *mda_copy(struct dm_pool *mem,
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struct metadata_area *mda);
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unsigned mda_is_ignored(struct metadata_area *mda);
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void mda_set_ignored(struct metadata_area *mda, unsigned ignored);
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unsigned mda_locns_match(struct metadata_area *mda1, struct metadata_area *mda2);
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struct device *mda_get_device(struct metadata_area *mda);
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struct format_instance_ctx {
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uint32_t type;
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union {
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const char *pv_id;
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struct {
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const char *vg_name;
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const char *vg_id;
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} vg_ref;
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void *private;
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} context;
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};
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struct format_instance *alloc_fid(const struct format_type *fmt,
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const struct format_instance_ctx *fic);
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/*
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* Format instance must always be set using pv_set_fid or vg_set_fid
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* (NULL value as well), never asign it directly! This is essential
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* for proper reference counting for the format instance.
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*/
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void pv_set_fid(struct physical_volume *pv, struct format_instance *fid);
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void vg_set_fid(struct volume_group *vg, struct format_instance *fid);
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/* FIXME: Add generic interface for mda counts based on given key. */
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int fid_add_mda(struct format_instance *fid, struct metadata_area *mda,
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const char *key, size_t key_len, const unsigned sub_key);
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int fid_add_mdas(struct format_instance *fid, struct dm_list *mdas,
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const char *key, size_t key_len);
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int fid_remove_mda(struct format_instance *fid, struct metadata_area *mda,
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const char *key, size_t key_len, const unsigned sub_key);
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struct metadata_area *fid_get_mda_indexed(struct format_instance *fid,
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const char *key, size_t key_len, const unsigned sub_key);
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int mdas_empty_or_ignored(struct dm_list *mdas);
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#define seg_pvseg(seg, s) (seg)->areas[(s)].u.pv.pvseg
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#define seg_dev(seg, s) (seg)->areas[(s)].u.pv.pvseg->pv->dev
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#define seg_pe(seg, s) (seg)->areas[(s)].u.pv.pvseg->pe
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#define seg_le(seg, s) (seg)->areas[(s)].u.lv.le
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#define seg_metale(seg, s) (seg)->meta_areas[(s)].u.lv.le
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struct name_list {
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struct dm_list list;
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char *name;
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};
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struct mda_list {
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struct dm_list list;
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struct device_area mda;
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};
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struct peg_list {
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struct dm_list list;
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struct pv_segment *peg;
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};
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struct seg_list {
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struct dm_list list;
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unsigned count;
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struct lv_segment *seg;
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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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* Scan any metadata areas that aren't referenced in PV labels
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*/
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int (*scan) (const struct format_type * fmt, const char *vgname);
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/*
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* Return PV with given path.
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*/
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int (*pv_read) (const struct format_type * fmt, const char *pv_name,
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struct physical_volume * pv, int scan_label_only);
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/*
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* Initialise a new PV.
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*/
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int (*pv_initialise) (const struct format_type * fmt,
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int64_t label_sector,
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unsigned long data_alignment,
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unsigned long data_alignment_offset,
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struct pvcreate_restorable_params *rp,
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struct physical_volume * pv);
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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) (const struct format_type * fmt,
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struct physical_volume * pv,
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struct volume_group * vg);
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/*
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* Add metadata area to a PV. Changes will take effect on pv_write.
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*/
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int (*pv_add_metadata_area) (const struct format_type * fmt,
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struct physical_volume * pv,
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int pe_start_locked,
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unsigned metadata_index,
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uint64_t metadata_size,
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unsigned metadata_ignored);
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/*
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* Remove metadata area from a PV. Changes will take effect on pv_write.
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*/
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int (*pv_remove_metadata_area) (const struct format_type *fmt,
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struct physical_volume *pv,
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unsigned metadata_index);
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/*
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* Recalculate the PV size taking into account any existing metadata areas.
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*/
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int (*pv_resize) (const struct format_type *fmt,
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struct physical_volume *pv,
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struct volume_group *vg,
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uint64_t size);
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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 a valid orphan VG name
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*/
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int (*pv_write) (const struct format_type * fmt,
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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,
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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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* Check whether particular segment type is supported.
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*/
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int (*segtype_supported) (struct format_instance *fid,
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const struct segment_type *segtype);
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/*
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* Create format instance with a particular metadata area
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*/
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struct format_instance *(*create_instance) (const struct format_type *fmt,
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const struct format_instance_ctx *fic);
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/*
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* Destructor for format instance
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*/
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void (*destroy_instance) (struct format_instance * fid);
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/*
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* Destructor for format type
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*/
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void (*destroy) (struct format_type * fmt);
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};
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/*
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* Utility functions
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*/
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unsigned long set_pe_align(struct physical_volume *pv, unsigned long data_alignment);
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unsigned long set_pe_align_offset(struct physical_volume *pv,
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unsigned long data_alignment_offset);
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int pv_write_orphan(struct cmd_context *cmd, struct physical_volume *pv);
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int pvremove_single(struct cmd_context *cmd, const char *pv_name,
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void *handle __attribute__((unused)), unsigned force_count,
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unsigned prompt);
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struct physical_volume *pvcreate_vol(struct cmd_context *cmd, const char *pv_name,
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struct pvcreate_params *pp, int write_now);
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int check_dev_block_size_for_vg(struct device *dev, const struct volume_group *vg,
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unsigned int *max_phys_block_size_found);
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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, const char *pv_name);
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/* Find a PV within a given VG */
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int get_pv_from_vg_by_id(const struct format_type *fmt, const char *vg_name,
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const char *vgid, const char *pvid,
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struct physical_volume *pv);
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struct lv_list *find_lv_in_vg_by_lvid(struct volume_group *vg,
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const union lvid *lvid);
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struct lv_list *find_lv_in_lv_list(const struct dm_list *ll,
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const struct logical_volume *lv);
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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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/* Find LV with given lvid (used during activation) */
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struct logical_volume *lv_from_lvid(struct cmd_context *cmd,
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const char *lvid_s,
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unsigned precommitted);
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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 pv_list *find_pv_in_pv_list(const struct dm_list *pl,
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const struct physical_volume *pv);
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/* Find LV segment containing given LE */
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struct lv_segment *find_seg_by_le(const struct logical_volume *lv, uint32_t le);
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/* Find pool LV segment given a thin pool data or metadata segment. */
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struct lv_segment *find_pool_seg(const struct lv_segment *seg);
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/* Find some unused device_id for thin pool LV segment. */
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uint32_t get_free_pool_device_id(struct lv_segment *thin_pool_seg);
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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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struct logical_volume *alloc_lv(struct dm_pool *mem);
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/*
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* Checks that an lv has no gaps or overlapping segments.
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* Set complete_vg to perform additional VG level checks.
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*/
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int check_lv_segments(struct logical_volume *lv, int complete_vg);
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/*
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* Checks that a replicator segment is correct.
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*/
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int check_replicator_segment(const struct lv_segment *replicator_seg);
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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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/*
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* Ensure there's a segment boundary at a given LE, splitting if necessary
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*/
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int lv_split_segment(struct logical_volume *lv, uint32_t le);
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/*
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* Add/remove upward link from underlying LV to the segment using it
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* FIXME: ridiculously long name
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*/
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int add_seg_to_segs_using_this_lv(struct logical_volume *lv, struct lv_segment *seg);
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int remove_seg_from_segs_using_this_lv(struct logical_volume *lv, struct lv_segment *seg);
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struct lv_segment *get_only_segment_using_this_lv(struct logical_volume *lv);
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int for_each_sub_lv(struct logical_volume *lv,
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int (*fn)(struct logical_volume *lv, void *data),
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void *data);
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int move_lv_segments(struct logical_volume *lv_to,
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struct logical_volume *lv_from,
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uint64_t set_status, uint64_t reset_status);
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/*
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* Calculate readahead from underlying PV devices
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*/
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void lv_calculate_readahead(const struct logical_volume *lv, uint32_t *read_ahead);
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/*
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* For internal metadata caching.
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*/
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size_t export_vg_to_buffer(struct volume_group *vg, char **buf);
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struct dm_config_tree *export_vg_to_config_tree(struct volume_group *vg);
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struct volume_group *import_vg_from_buffer(const char *buf,
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struct format_instance *fid);
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struct volume_group *import_vg_from_config_tree(const struct dm_config_tree *cft,
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struct format_instance *fid);
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/*
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* Mirroring functions
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*/
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/*
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* Given mirror image or mirror log segment, find corresponding mirror segment
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*/
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int fixup_imported_mirrors(struct volume_group *vg);
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/*
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* From thin_manip.c
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*/
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int attach_pool_lv(struct lv_segment *seg, struct logical_volume *pool_lv,
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struct logical_volume *origin_lv, struct logical_volume *merge_lv);
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int detach_pool_lv(struct lv_segment *seg);
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int attach_pool_message(struct lv_segment *pool_seg, dm_thin_message_t type,
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struct logical_volume *lv, uint32_t delete_id,
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int auto_increment);
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int lv_is_merging_thin_snapshot(const struct logical_volume *lv);
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int pool_has_message(const struct lv_segment *seg,
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const struct logical_volume *lv, uint32_t device_id);
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int pool_below_threshold(const struct lv_segment *pool_seg);
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int create_pool(struct logical_volume *lv, const struct segment_type *segtype,
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struct alloc_handle *ah, uint32_t stripes, uint32_t stripe_size);
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/*
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* Begin skeleton for external LVM library
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*/
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struct id pv_id(const struct physical_volume *pv);
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const struct format_type *pv_format_type(const struct physical_volume *pv);
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struct id pv_vgid(const struct physical_volume *pv);
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int add_pv_to_vg(struct volume_group *vg, const char *pv_name,
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struct physical_volume *pv, struct pvcreate_params *pp);
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uint64_t find_min_mda_size(struct dm_list *mdas);
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char *tags_format_and_copy(struct dm_pool *mem, const struct dm_list *tagsl);
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#endif
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