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fc63d04f42
o First pass at low level labelling switch. This allows us to register different label types (eg, lvm1, lvm2).
85 lines
1.6 KiB
C
85 lines
1.6 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 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 "uuid.h"
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#include "device.h"
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struct label {
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struct uuid id;
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char volume_type[32];
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uint32_t version[3];
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size_t extra_len;
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char *extra_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, struct device *dev);
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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 labeller *l,
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struct device *dev, struct label *label);
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/*
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* Remove a label from a device.
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*/
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int (*remove)(struct labeller *l, struct device *dev);
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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,
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struct device *dev, 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, struct device *dev);
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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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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(const char *path);
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int label_read(const char *path, struct label **result);
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int label_verify(const char *path);
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void label_free(struct label *l);
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/*
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* We'll support two label types: the 'pretend the
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* LVM1 pv structure at the begining of the disk
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* is a label' hack, and pjc's 1 sector labels at
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* the front and back of the device.
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*/
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#endif
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