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 #ifdef CONFIG_MD
57
58 /*
59 * Different major versions are not compatible.
60 * Different minor versions are only downward compatible.
61 * Different patchlevel versions are downward and upward compatible.
62 */
63 #define MD_MAJOR_VERSION 0
64 #define MD_MINOR_VERSION 90
65 /*
66 * MD_PATCHLEVEL_VERSION indicates kernel functionality.
67 * >=1 means different superblock formats are selectable using SET_ARRAY_INFO
68 * and major_version/minor_version accordingly
69 * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
70 * in the super status byte
71 * >=3 means that bitmap superblock version 4 is supported, which uses
72 * little-ending representation rather than host-endian
73 */
74 #define MD_PATCHLEVEL_VERSION 3
75
76 extern int register_md_personality (struct mdk_personality *p);
77 extern int unregister_md_personality (struct mdk_personality *p);
78 extern mdk_thread_t * md_register_thread (void (*run) (mddev_t *mddev),
79 mddev_t *mddev, const char *name);
80 extern void md_unregister_thread (mdk_thread_t *thread);
81 extern void md_wakeup_thread(mdk_thread_t *thread);
82 extern void md_check_recovery(mddev_t *mddev);
83 extern void md_write_start(mddev_t *mddev, struct bio *bi);
84 extern void md_write_end(mddev_t *mddev);
85 extern void md_handle_safemode(mddev_t *mddev);
86 extern void md_done_sync(mddev_t *mddev, int blocks, int ok);
87 extern void md_error (mddev_t *mddev, mdk_rdev_t *rdev);
88 extern void md_unplug_mddev(mddev_t *mddev);
89
90 extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
91 sector_t sector, int size, struct page *page);
92 extern void md_super_wait(mddev_t *mddev);
93 extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
94 struct page *page, int rw);
95 extern void md_do_sync(mddev_t *mddev);
96 extern void md_new_event(mddev_t *mddev);
97 extern void md_allow_write(mddev_t *mddev);
98
99 #endif /* CONFIG_MD */
100 #endif
101
102
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