/* $NetBSD: label.h,v 1.1.1.1 2008/12/22 00:18:47 haad Exp $ */ /* * Copyright (C) 2002-2004 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 */ #ifndef _LVM_LABEL_H #define _LVM_LABEL_H #include "uuid.h" #include "device.h" #define LABEL_ID "LABELONE" #define LABEL_SIZE SECTOR_SIZE /* Think very carefully before changing this */ #define LABEL_SCAN_SECTORS 4L #define LABEL_SCAN_SIZE (LABEL_SCAN_SECTORS << SECTOR_SHIFT) struct labeller; /* On disk - 32 bytes */ struct label_header { int8_t id[8]; /* LABELONE */ uint64_t sector_xl; /* Sector number of this label */ uint32_t crc_xl; /* From next field to end of sector */ uint32_t offset_xl; /* Offset from start of struct to contents */ int8_t type[8]; /* LVM2 001 */ } __attribute__ ((packed)); /* In core */ struct label { char type[8]; uint64_t sector; struct labeller *labeller; void *info; }; struct labeller; struct label_ops { /* * Is the device labelled with this format ? */ int (*can_handle) (struct labeller * l, void *buf, uint64_t sector); /* * Write a label to a volume. */ int (*write) (struct label * label, void *buf); /* * Read a label from a volume. */ int (*read) (struct labeller * l, struct device * dev, void *buf, struct label ** label); /* * Additional consistency checks for the paranoid. */ int (*verify) (struct labeller * l, void *buf, uint64_t sector); /* * Populate label_type etc. */ int (*initialise_label) (struct labeller * l, struct label * label); /* * Destroy a previously read label. */ void (*destroy_label) (struct labeller * l, struct label * label); /* * Destructor. */ void (*destroy) (struct labeller * l); }; struct labeller { struct label_ops *ops; const void *private; }; int label_init(void); void label_exit(void); int label_register_handler(const char *name, struct labeller *handler); struct labeller *label_get_handler(const char *name); int label_remove(struct device *dev); int label_read(struct device *dev, struct label **result, uint64_t scan_sector); int label_write(struct device *dev, struct label *label); int label_verify(struct device *dev); struct label *label_create(struct labeller *labeller); void label_destroy(struct label *label); #endif