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9194610f42
Flags are set on the initial I/O and passed to any callbacks that may in turn issue further I/O using the inherited flags.
116 lines
3.8 KiB
C
116 lines
3.8 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _LVM_TEXT_LAYOUT_H
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#define _LVM_TEXT_LAYOUT_H
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#include "config.h"
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#include "format-text.h"
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#include "metadata.h"
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#include "lvmcache.h"
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#include "uuid.h"
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/* disk_locn and data_area_list are defined in format-text.h */
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/*
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* PV header extension versions:
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* - version 1: bootloader area support
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* - version 2: PV_EXT_USED flag support
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*/
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#define PV_HEADER_EXTENSION_VSN 2
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struct pv_header_extension {
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uint32_t version;
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uint32_t flags;
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/* NULL-terminated list of bootloader areas */
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struct disk_locn bootloader_areas_xl[0];
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} __attribute__ ((packed));
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/* Fields with the suffix _xl should be xlate'd wherever they appear */
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/* On disk */
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struct pv_header {
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int8_t pv_uuid[ID_LEN];
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/* This size can be overridden if PV belongs to a VG */
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uint64_t device_size_xl; /* Bytes */
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/* NULL-terminated list of data areas followed by */
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/* NULL-terminated list of metadata area headers */
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struct disk_locn disk_areas_xl[0]; /* Two lists */
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} __attribute__ ((packed));
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/*
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* Ignore this raw location. This allows us to
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* ignored metadata areas easily, and thus balance
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* metadata across VGs with many PVs.
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*/
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#define RAW_LOCN_IGNORED 0x00000001
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/* On disk */
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struct raw_locn {
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uint64_t offset; /* Offset in bytes to start sector */
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uint64_t size; /* Bytes */
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uint32_t checksum;
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uint32_t flags;
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} __attribute__ ((packed));
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int rlocn_is_ignored(const struct raw_locn *rlocn);
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void rlocn_set_ignored(struct raw_locn *rlocn, unsigned mda_ignored);
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/* On disk */
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/* Structure size limited to one sector */
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struct mda_header {
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uint32_t checksum_xl; /* Checksum of rest of mda_header */
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int8_t magic[16]; /* To aid scans for metadata */
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uint32_t version;
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uint64_t start; /* Absolute start byte of mda_header */
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uint64_t size; /* Size of metadata area */
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struct raw_locn raw_locns[0]; /* NULL-terminated list */
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} __attribute__ ((packed));
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struct mda_header *raw_read_mda_header(struct dm_pool *mem, struct device_area *dev_area, int primary_mda);
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int raw_read_mda_header_callback(struct dm_pool *mem, struct device_area *dev_area, int primary_mda,
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unsigned ioflags, lvm_callback_fn_t mdah_callback_fn, void *mdah_callback_context);
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struct mda_lists {
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struct dm_list dirs;
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struct dm_list raws;
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struct metadata_area_ops *file_ops;
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struct metadata_area_ops *raw_ops;
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};
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struct mda_context {
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struct device_area area;
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uint64_t free_sectors;
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struct raw_locn rlocn; /* Store inbetween write and commit */
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};
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/* FIXME Convert this at runtime */
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#define FMTT_MAGIC "\040\114\126\115\062\040\170\133\065\101\045\162\060\116\052\076"
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#define FMTT_VERSION 1
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#define MDA_HEADER_SIZE 512
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#define LVM2_LABEL "LVM2 001"
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#define MDA_SIZE_MIN (8 * (unsigned) lvm_getpagesize())
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#define MDA_ORIGINAL_ALIGNMENT 512 /* Original alignment used for start of VG metadata content */
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#define MDA_ALIGNMENT 4096 /* Default alignment in bytes since 2.02.177 for start of VG metadata content. */
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int vgname_from_mda(const struct format_type *fmt, const struct mda_header *mdah, int primary_mda,
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struct device_area *dev_area, struct lvmcache_vgsummary *vgsummary,
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uint64_t *mda_free_sectors, unsigned ioflags,
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lvm_callback_fn_t update_vgsummary_callback_fn, void *update_vgsummary_callback_context);
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#endif
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