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
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)
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.
21 #include <linux/blkdev.h>
22 #include <linux/seq_file.h>
25 * 'md_p.h' holds the 'physical' layout of RAID devices
26 * 'md_u.h' holds the user <=> kernel API
28 * 'md_k.h' holds kernel internal definitions
31 #include <linux/raid/md_p.h>
32 #include <linux/raid/md_u.h>
33 #include <linux/raid/md_k.h>
38 * Different major versions are not compatible.
39 * Different minor versions are only downward compatible.
40 * Different patchlevel versions are downward and upward compatible.
42 #define MD_MAJOR_VERSION 0
43 #define MD_MINOR_VERSION 90
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
53 #define MD_PATCHLEVEL_VERSION 3
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);
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);
79 #endif /* CONFIG_MD */