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 <linux/major.h>
  23 #include <linux/ioctl.h>
  24 #include <linux/types.h>
  25 #include <linux/bitops.h>
  26 #include <linux/module.h>
  27 #include <linux/hdreg.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/seq_file.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/delay.h>
  32 #include <net/checksum.h>
  33 #include <linux/random.h>
  34 #include <linux/kernel_stat.h>
  35 #include <asm/io.h>
  36 #include <linux/completion.h>
  37 #include <linux/mempool.h>
  38 #include <linux/list.h>
  39 #include <linux/reboot.h>
  40 #include <linux/vmalloc.h>
  41 #include <linux/blkpg.h>
  42 #include <linux/bio.h>
  43
  44 /*
  45  * 'md_p.h' holds the 'physical' layout of RAID devices
  46  * 'md_u.h' holds the user <=> kernel API
  47  *
  48  * 'md_k.h' holds kernel internal definitions
  49  */
  50
  51 #include <linux/raid/md_p.h>
  52 #include <linux/raid/md_u.h>
  53 #include <linux/raid/md_k.h>
  54
  55 #ifdef CONFIG_MD
  56
  57 /*
  58  * Different major versions are not compatible.
  59  * Different minor versions are only downward compatible.
  60  * Different patchlevel versions are downward and upward compatible.
  61  */
  62 #define MD_MAJOR_VERSION                0
  63 #define MD_MINOR_VERSION                90
  64 /*
  65  * MD_PATCHLEVEL_VERSION indicates kernel functionality.
  66  * >=1 means different superblock formats are selectable using SET_ARRAY_INFO
  67  *     and major_version/minor_version accordingly
  68  * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
  69  *     in the super status byte
  70  * >=3 means that bitmap superblock version 4 is supported, which uses
  71  *     little-ending representation rather than host-endian
  72  */
  73 #define MD_PATCHLEVEL_VERSION           3
  74
  75 extern int mdp_major;
  76
  77 extern int register_md_personality (struct mdk_personality *p);
  78 extern int unregister_md_personality (struct mdk_personality *p);
  79 extern mdk_thread_t * md_register_thread (void (*run) (mddev_t *mddev),
  80                                 mddev_t *mddev, const char *name);
  81 extern void md_unregister_thread (mdk_thread_t *thread);
  82 extern void md_wakeup_thread(mdk_thread_t *thread);
  83 extern void md_check_recovery(mddev_t *mddev);
  84 extern void md_write_start(mddev_t *mddev, struct bio *bi);
  85 extern void md_write_end(mddev_t *mddev);
  86 extern void md_handle_safemode(mddev_t *mddev);
  87 extern void md_done_sync(mddev_t *mddev, int blocks, int ok);
  88 extern void md_error (mddev_t *mddev, mdk_rdev_t *rdev);
  89 extern void md_unplug_mddev(mddev_t *mddev);
  90
  91 extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
  92                            sector_t sector, int size, struct page *page);
  93 extern void md_super_wait(mddev_t *mddev);
  94 extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
  95                         struct page *page, int rw);
  96 extern void md_do_sync(mddev_t *mddev);
  97 extern void md_new_event(mddev_t *mddev);
  98 extern int md_allow_write(mddev_t *mddev);
  99 extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
 100
 101 #endif /* CONFIG_MD */
 102 #endif
 103