include/grub/raid.h

   1 /* raid.h - On disk structures for RAID. */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2006,2007,2008  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef GRUB_RAID_H
  21 #define GRUB_RAID_H     1
  22
  23 #include <grub/types.h>
  24
  25 #define GRUB_RAID_MAX_DEVICES   32
  26
  27 #define GRUB_RAID_LAYOUT_LEFT_ASYMMETRIC        0
  28 #define GRUB_RAID_LAYOUT_RIGHT_ASYMMETRIC       1
  29 #define GRUB_RAID_LAYOUT_LEFT_SYMMETRIC         2
  30 #define GRUB_RAID_LAYOUT_RIGHT_SYMMETRIC        3
  31
  32 #define GRUB_RAID_LAYOUT_RIGHT_MASK             1
  33 #define GRUB_RAID_LAYOUT_SYMMETRIC_MASK         2
  34
  35 struct grub_raid_array
  36 {
  37   int number;              /* The device number, taken from md_minor so we
  38                               are consistent with the device name in
  39                               Linux. */
  40   int level;               /* RAID levels, only 0, 1 or 5 at the moment. */
  41   int layout;              /* Layout for RAID 5/6.  */
  42   unsigned int total_devs; /* Total number of devices in the array. */
  43   grub_size_t chunk_size;  /* The size of a chunk, in 512 byte sectors. */
  44   grub_uint64_t disk_size; /* Size of an individual disk, in 512 byte
  45                               sectors. */
  46   int index;               /* Index of current device.  */
  47   int uuid_len;            /* The length of uuid.  */
  48   char *uuid;              /* The UUID of the device. */
  49
  50   /* The following field is setup by the caller.  */
  51   char *name;              /* That will be "md<number>". */
  52   unsigned int nr_devs;    /* The number of devices we've found so far. */
  53   grub_disk_t device[GRUB_RAID_MAX_DEVICES];  /* Array of total_devs devices. */
  54   struct grub_raid_array *next;
  55 };
  56
  57 struct grub_raid
  58 {
  59   const char *name;
  60
  61   grub_err_t (*detect) (grub_disk_t disk, struct grub_raid_array *array);
  62
  63   struct grub_raid *next;
  64 };
  65 typedef struct grub_raid *grub_raid_t;
  66
  67 void grub_raid_register (grub_raid_t raid);
  68 void grub_raid_unregister (grub_raid_t raid);
  69
  70 void grub_raid_block_xor (char *buf1, const char *buf2, int size);
  71
  72 typedef grub_err_t (*grub_raid5_recover_func_t) (struct grub_raid_array *array,
  73                                                  int disknr, char *buf,
  74                                                  grub_disk_addr_t sector,
  75                                                  int size);
  76
  77 typedef grub_err_t (*grub_raid6_recover_func_t) (struct grub_raid_array *array,
  78                                                  int disknr, int p, char *buf,
  79                                                  grub_disk_addr_t sector,
  80                                                  int size);
  81
  82 extern grub_raid5_recover_func_t grub_raid5_recover_func;
  83 extern grub_raid6_recover_func_t grub_raid6_recover_func;
  84
  85 #endif /* ! GRUB_RAID_H */