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include/zfs/vdev_impl.h
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/* * GRUB -- GRand Unified Bootloader * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. * |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_VDEV_IMPL_H
#define _SYS_VDEV_IMPL_H
#define VDEV_SKIP_SIZE (8 << 10)
#define VDEV_BOOT_HEADER_SIZE (8 << 10)
#define VDEV_PHYS_SIZE (112 << 10)
#define VDEV_UBERBLOCK_RING (128 << 10)
/* ZFS boot block */
#define VDEV_BOOT_MAGIC 0x2f5b007b10cULL
#define VDEV_BOOT_VERSION 1 /* version number */
typedef struct vdev_boot_header {
uint64_t vb_magic; /* VDEV_BOOT_MAGIC */
uint64_t vb_version; /* VDEV_BOOT_VERSION */
uint64_t vb_offset; /* start offset (bytes) */
uint64_t vb_size; /* size (bytes) */
char vb_pad[VDEV_BOOT_HEADER_SIZE - 4 * sizeof(uint64_t)];
} vdev_boot_header_t;
typedef struct vdev_phys {
char vp_nvlist[VDEV_PHYS_SIZE - sizeof(zio_eck_t)];
zio_eck_t vp_zbt;
} vdev_phys_t;
typedef struct vdev_label {
char vl_pad[VDEV_SKIP_SIZE]; /* 8K */
vdev_boot_header_t vl_boot_header; /* 8K */
vdev_phys_t vl_vdev_phys; /* 112K */
char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */
} vdev_label_t; /* 256K total */
/*
* Size and offset of embedded boot loader region on each label.
* The total size of the first two labels plus the boot area is 4MB.
*/
#define VDEV_BOOT_OFFSET (2 * sizeof(vdev_label_t))
#define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
/*
* Size of label regions at the start and end of each leaf device.
*/
#define VDEV_LABEL_START_SIZE (2 * sizeof(vdev_label_t) + VDEV_BOOT_SIZE)
#define VDEV_LABEL_END_SIZE (2 * sizeof(vdev_label_t))
#define VDEV_LABELS 4
#endif /* _SYS_VDEV_IMPL_H */
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