include/linux/raid/md.h

   1 /*
   2    md.h : Multiple Devices driver for Linux
   3           Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
   4           Copyright (C) 1994-96 Marc ZYNGIER
   5           <zyngier@ufr-info-p7.ibp.fr> or
   6           <maz@gloups.fdn.fr>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    You should have received a copy of the GNU General Public License
  14    (for example /usr/src/linux/COPYING); if not, write to the Free
  15    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16 */
  17
  18 #ifndef _MD_H
  19 #define _MD_H
  20
  21 #include <linux/blkdev.h>
  22 #include <asm/semaphore.h>
  23 #include <linux/major.h>
  24 #include <linux/ioctl.h>
  25 #include <linux/types.h>
  26 #include <linux/bitops.h>
  27 #include <linux/module.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/smp_lock.h>
  32 #include <linux/delay.h>
  33 #include <net/checksum.h>
  34 #include <linux/random.h>
  35 #include <linux/kernel_stat.h>
  36 #include <asm/io.h>
  37 #include <linux/completion.h>
  38 #include <linux/mempool.h>
  39 #include <linux/list.h>
  40 #include <linux/reboot.h>
  41 #include <linux/vmalloc.h>
  42 #include <linux/blkpg.h>
  43 #include <linux/bio.h>
  44
  45 /*
  46  * 'md_p.h' holds the 'physical' layout of RAID devices
  47  * 'md_u.h' holds the user <=> kernel API
  48  *
  49  * 'md_k.h' holds kernel internal definitions
  50  */
  51
  52 #include <linux/raid/md_p.h>
  53 #include <linux/raid/md_u.h>
  54 #include <linux/raid/md_k.h>
  55
  56 /*
  57  * Different major versions are not compatible.
  58  * Different minor versions are only downward compatible.
  59  * Different patchlevel versions are downward and upward compatible.
  60  */
  61 #define MD_MAJOR_VERSION                0
  62 #define MD_MINOR_VERSION                90
  63 /*
  64  * MD_PATCHLEVEL_VERSION indicates kernel functionality.
  65  * >=1 means different superblock formats are selectable using SET_ARRAY_INFO
  66  *     and major_version/minor_version accordingly
  67  * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
  68  *     in the super status byte
  69  */
  70 #define MD_PATCHLEVEL_VERSION           2
  71
  72 extern int register_md_personality (int p_num, mdk_personality_t *p);
  73 extern int unregister_md_personality (int p_num);
  74 extern mdk_thread_t * md_register_thread (void (*run) (mddev_t *mddev),
  75                                 mddev_t *mddev, const char *name);
  76 extern void md_unregister_thread (mdk_thread_t *thread);
  77 extern void md_wakeup_thread(mdk_thread_t *thread);
  78 extern void md_check_recovery(mddev_t *mddev);
  79 extern void md_write_start(mddev_t *mddev, struct bio *bi);
  80 extern void md_write_end(mddev_t *mddev);
  81 extern void md_handle_safemode(mddev_t *mddev);
  82 extern void md_done_sync(mddev_t *mddev, int blocks, int ok);
  83 extern void md_error (mddev_t *mddev, mdk_rdev_t *rdev);
  84 extern void md_unplug_mddev(mddev_t *mddev);
  85
  86 extern void md_print_devices (void);
  87
  88 extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
  89                            sector_t sector, int size, struct page *page);
  90 extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
  91                         struct page *page, int rw);
  92
  93
  94 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
  95
  96 #endif
  97