vdev_impl.h 1.7 KB

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  1. /* SPDX-License-Identifier: GPL-2.0+ */
  2. /*
  3. * GRUB -- GRand Unified Bootloader
  4. * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
  5. */
  6. /*
  7. * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
  8. * Use is subject to license terms.
  9. */
  10. #ifndef _SYS_VDEV_IMPL_H
  11. #define _SYS_VDEV_IMPL_H
  12. #define VDEV_SKIP_SIZE (8 << 10)
  13. #define VDEV_BOOT_HEADER_SIZE (8 << 10)
  14. #define VDEV_PHYS_SIZE (112 << 10)
  15. #define VDEV_UBERBLOCK_RING (128 << 10)
  16. /* ZFS boot block */
  17. #define VDEV_BOOT_MAGIC 0x2f5b007b10cULL
  18. #define VDEV_BOOT_VERSION 1 /* version number */
  19. typedef struct vdev_boot_header {
  20. uint64_t vb_magic; /* VDEV_BOOT_MAGIC */
  21. uint64_t vb_version; /* VDEV_BOOT_VERSION */
  22. uint64_t vb_offset; /* start offset (bytes) */
  23. uint64_t vb_size; /* size (bytes) */
  24. char vb_pad[VDEV_BOOT_HEADER_SIZE - 4 * sizeof(uint64_t)];
  25. } vdev_boot_header_t;
  26. typedef struct vdev_phys {
  27. char vp_nvlist[VDEV_PHYS_SIZE - sizeof(zio_eck_t)];
  28. zio_eck_t vp_zbt;
  29. } vdev_phys_t;
  30. typedef struct vdev_label {
  31. char vl_pad[VDEV_SKIP_SIZE]; /* 8K */
  32. vdev_boot_header_t vl_boot_header; /* 8K */
  33. vdev_phys_t vl_vdev_phys; /* 112K */
  34. char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */
  35. } vdev_label_t; /* 256K total */
  36. /*
  37. * Size and offset of embedded boot loader region on each label.
  38. * The total size of the first two labels plus the boot area is 4MB.
  39. */
  40. #define VDEV_BOOT_OFFSET (2 * sizeof(vdev_label_t))
  41. #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
  42. /*
  43. * Size of label regions at the start and end of each leaf device.
  44. */
  45. #define VDEV_LABEL_START_SIZE (2 * sizeof(vdev_label_t) + VDEV_BOOT_SIZE)
  46. #define VDEV_LABEL_END_SIZE (2 * sizeof(vdev_label_t))
  47. #define VDEV_LABELS 4
  48. #endif /* _SYS_VDEV_IMPL_H */