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/seq_file.h>

    23 

    24 /*

    25  * 'md_p.h' holds the 'physical' layout of RAID devices

    26  * 'md_u.h' holds the user <=> kernel API

    27  *

    28  * 'md_k.h' holds kernel internal definitions

    29  */

    30 

    31 #include <linux/raid/md_p.h>

    32 #include <linux/raid/md_u.h>

    33 #include <linux/raid/md_k.h>

    34 

    35 #ifdef CONFIG_MD

    36 

    37 /*

    38  * Different major versions are not compatible.

    39  * Different minor versions are only downward compatible.

    40  * Different patchlevel versions are downward and upward compatible.

    41  */

    42 #define MD_MAJOR_VERSION                0

    43 #define MD_MINOR_VERSION                90

    44 /*

    45  * MD_PATCHLEVEL_VERSION indicates kernel functionality.

    46  * >=1 means different superblock formats are selectable using SET_ARRAY_INFO

    47  *     and major_version/minor_version accordingly

    48  * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT

    49  *     in the super status byte

    50  * >=3 means that bitmap superblock version 4 is supported, which uses

    51  *     little-ending representation rather than host-endian

    52  */

    53 #define MD_PATCHLEVEL_VERSION           3

    54 

    55 extern int mdp_major;

    56 

    57 extern int register_md_personality(struct mdk_personality *p);

    58 extern int unregister_md_personality(struct mdk_personality *p);

    59 extern mdk_thread_t * md_register_thread(void (*run) (mddev_t *mddev),

    60 				mddev_t *mddev, const char *name);

    61 extern void md_unregister_thread(mdk_thread_t *thread);

    62 extern void md_wakeup_thread(mdk_thread_t *thread);

    63 extern void md_check_recovery(mddev_t *mddev);

    64 extern void md_write_start(mddev_t *mddev, struct bio *bi);

    65 extern void md_write_end(mddev_t *mddev);

    66 extern void md_done_sync(mddev_t *mddev, int blocks, int ok);

    67 extern void md_error(mddev_t *mddev, mdk_rdev_t *rdev);

    68 

    69 extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,

    70 			   sector_t sector, int size, struct page *page);

    71 extern void md_super_wait(mddev_t *mddev);

    72 extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,

    73 			struct page *page, int rw);

    74 extern void md_do_sync(mddev_t *mddev);

    75 extern void md_new_event(mddev_t *mddev);

    76 extern int md_allow_write(mddev_t *mddev);

    77 extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);

    78 

    79 #endif /* CONFIG_MD */

    80 #endif 

    81