raid5.c (18b0033491f584a2d79697da714b1ef9d6b27d22) raid5.c (f701d589aa34d7531183c9ac6f7713ba14212b02)
1/*
2 * raid5.c : Multiple Devices driver for Linux
3 * Copyright (C) 1996, 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman
4 * Copyright (C) 1999, 2000 Ingo Molnar
5 * Copyright (C) 2002, 2003 H. Peter Anvin
6 *
7 * RAID-4/5/6 management functions.
8 * Thanks to Penguin Computing for making the RAID-6 development possible

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40 * When we notice that bm_flush > bm_write, we write out all pending updates
41 * to the bitmap, and advance bm_write to where bm_flush was.
42 * This may occasionally write a bit out twice, but is sure never to
43 * miss any bits.
44 */
45
46#include <linux/blkdev.h>
47#include <linux/kthread.h>
1/*
2 * raid5.c : Multiple Devices driver for Linux
3 * Copyright (C) 1996, 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman
4 * Copyright (C) 1999, 2000 Ingo Molnar
5 * Copyright (C) 2002, 2003 H. Peter Anvin
6 *
7 * RAID-4/5/6 management functions.
8 * Thanks to Penguin Computing for making the RAID-6 development possible

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40 * When we notice that bm_flush > bm_write, we write out all pending updates
41 * to the bitmap, and advance bm_write to where bm_flush was.
42 * This may occasionally write a bit out twice, but is sure never to
43 * miss any bits.
44 */
45
46#include <linux/blkdev.h>
47#include <linux/kthread.h>
48#include <linux/raid/pq.h>
48#include <linux/async_tx.h>
49#include <linux/seq_file.h>
50#include "md.h"
51#include "raid5.h"
49#include <linux/async_tx.h>
50#include <linux/seq_file.h>
51#include "md.h"
52#include "raid5.h"
52#include "raid6.h"
53#include "bitmap.h"
54
55/*
56 * Stripe cache
57 */
58
59#define NR_STRIPES 256
60#define STRIPE_SIZE PAGE_SIZE

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89
90#ifdef DEBUG
91#define inline
92#define __inline__
93#endif
94
95#define printk_rl(args...) ((void) (printk_ratelimit() && printk(args)))
96
53#include "bitmap.h"
54
55/*
56 * Stripe cache
57 */
58
59#define NR_STRIPES 256
60#define STRIPE_SIZE PAGE_SIZE

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89
90#ifdef DEBUG
91#define inline
92#define __inline__
93#endif
94
95#define printk_rl(args...) ((void) (printk_ratelimit() && printk(args)))
96
97#if !RAID6_USE_EMPTY_ZERO_PAGE
98/* In .bss so it's zeroed */
99const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));
100#endif
101
102/*
103 * We maintain a biased count of active stripes in the bottom 16 bits of
104 * bi_phys_segments, and a count of processed stripes in the upper 16 bits
105 */
106static inline int raid5_bi_phys_segments(struct bio *bio)
107{
108 return bio->bi_phys_segments & 0xffff;
109}

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5148 .check_reshape = raid5_check_reshape,
5149 .start_reshape = raid5_start_reshape,
5150#endif
5151 .quiesce = raid5_quiesce,
5152};
5153
5154static int __init raid5_init(void)
5155{
97/*
98 * We maintain a biased count of active stripes in the bottom 16 bits of
99 * bi_phys_segments, and a count of processed stripes in the upper 16 bits
100 */
101static inline int raid5_bi_phys_segments(struct bio *bio)
102{
103 return bio->bi_phys_segments & 0xffff;
104}

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5143 .check_reshape = raid5_check_reshape,
5144 .start_reshape = raid5_start_reshape,
5145#endif
5146 .quiesce = raid5_quiesce,
5147};
5148
5149static int __init raid5_init(void)
5150{
5156 int e;
5157
5158 e = raid6_select_algo();
5159 if ( e )
5160 return e;
5161 register_md_personality(&raid6_personality);
5162 register_md_personality(&raid5_personality);
5163 register_md_personality(&raid4_personality);
5164 return 0;
5165}
5166
5167static void raid5_exit(void)
5168{

--- 20 unchanged lines hidden --- 		5151 register_md_personality(&raid6_personality);
5152 register_md_personality(&raid5_personality);
5153 register_md_personality(&raid4_personality);
5154 return 0;
5155}
5156
5157static void raid5_exit(void)
5158{

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