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 82