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96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
/*
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* Copyright (C) 2002 Sistina Software (UK) Limited.
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*
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* This file is released under the LGPL.
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*/
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#ifndef _LVM_LABEL_H
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#define _LVM_LABEL_H
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#include "cache.h"
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#include "uuid.h"
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#include "device.h"
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#define LABEL_ID "LABELONE"
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#define LABEL_SIZE SECTOR_SIZE /* Think very carefully before changing this */
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#define LABEL_SCAN_SECTORS 4L
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#define LABEL_SCAN_SIZE (LABEL_SCAN_SECTORS << SECTOR_SHIFT)
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/* On disk - 32 bytes */
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struct label_header {
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uint8_t id[8]; /* LABELONE */
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uint64_t sector_xl; /* Sector number of this label */
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uint32_t crc_xl; /* From next field to end of sector */
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uint32_t offset_xl; /* Offset from start of struct to contents */
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uint8_t type[8]; /* LVM2 001 */
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} __attribute__ ((packed));
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/* In core */
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struct label {
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char type[8];
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uint64_t sector;
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struct labeller *labeller;
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void *info;
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};
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struct labeller;
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struct label_ops {
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/*
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* Is the device labelled with this format ?
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*/
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int (*can_handle) (struct labeller * l, char *buf, uint64_t sector);
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/*
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* Write a label to a volume.
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*/
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int (*write) (struct label * label, char *buf);
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/*
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* Read a label from a volume.
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*/
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int (*read) (struct labeller * l, struct device * dev,
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char *buf, struct label ** label);
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/*
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* Additional consistency checks for the paranoid.
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*/
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int (*verify) (struct labeller * l, char *buf, uint64_t sector);
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/*
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* Populate label_type etc.
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*/
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int (*initialise_label) (struct labeller * l, struct label * label);
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/*
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* Destroy a previously read label.
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*/
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void (*destroy_label) (struct labeller * l, struct label * label);
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/*
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* Destructor.
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*/
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void (*destroy) (struct labeller * l);
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};
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struct labeller {
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struct label_ops *ops;
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const void *private;
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};
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int label_init(void);
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void label_exit(void);
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int label_register_handler(const char *name, struct labeller *handler);
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struct labeller *label_get_handler(const char *name);
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int label_remove(struct device *dev);
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int label_read(struct device *dev, struct label **result);
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int label_write(struct device *dev, struct label *label);
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int label_verify(struct device *dev);
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struct label *label_create(struct labeller *labeller);
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void label_destroy(struct label *label);
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#endif
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