include/zfs/vdev_impl.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /*
  20  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  21  * Use is subject to license terms.
  22  */
  23
  24 #ifndef _SYS_VDEV_IMPL_H
  25 #define _SYS_VDEV_IMPL_H
  26
  27 #define VDEV_SKIP_SIZE          (8 << 10)
  28 #define VDEV_BOOT_HEADER_SIZE   (8 << 10)
  29 #define VDEV_PHYS_SIZE          (112 << 10)
  30 #define VDEV_UBERBLOCK_RING     (128 << 10)
  31
  32 /* ZFS boot block */
  33 #define VDEV_BOOT_MAGIC         0x2f5b007b10cULL
  34 #define VDEV_BOOT_VERSION       1               /* version number       */
  35
  36 typedef struct vdev_boot_header {
  37         uint64_t        vb_magic;               /* VDEV_BOOT_MAGIC      */
  38         uint64_t        vb_version;             /* VDEV_BOOT_VERSION    */
  39         uint64_t        vb_offset;              /* start offset (bytes) */
  40         uint64_t        vb_size;                /* size (bytes)         */
  41         char            vb_pad[VDEV_BOOT_HEADER_SIZE - 4 * sizeof(uint64_t)];
  42 } vdev_boot_header_t;
  43
  44 typedef struct vdev_phys {
  45         char            vp_nvlist[VDEV_PHYS_SIZE - sizeof(zio_eck_t)];
  46         zio_eck_t       vp_zbt;
  47 } vdev_phys_t;
  48
  49 typedef struct vdev_label {
  50         char            vl_pad[VDEV_SKIP_SIZE];                 /*   8K */
  51         vdev_boot_header_t vl_boot_header;                      /*   8K */
  52         vdev_phys_t     vl_vdev_phys;                           /* 112K */
  53         char            vl_uberblock[VDEV_UBERBLOCK_RING];      /* 128K */
  54 } vdev_label_t;                                                 /* 256K total */
  55
  56 /*
  57  * Size and offset of embedded boot loader region on each label.
  58  * The total size of the first two labels plus the boot area is 4MB.
  59  */
  60 #define VDEV_BOOT_OFFSET        (2 * sizeof(vdev_label_t))
  61 #define VDEV_BOOT_SIZE          (7ULL << 19)                    /* 3.5M */
  62
  63 /*
  64  * Size of label regions at the start and end of each leaf device.
  65  */
  66 #define VDEV_LABEL_START_SIZE   (2 * sizeof(vdev_label_t) + VDEV_BOOT_SIZE)
  67 #define VDEV_LABEL_END_SIZE     (2 * sizeof(vdev_label_t))
  68 #define VDEV_LABELS             4
  69
  70 #endif  /* _SYS_VDEV_IMPL_H */