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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _RAID1_H
2#define _RAID1_H
3
4#include <linux/raid/md.h>
5
6typedef struct mirror_info mirror_info_t;
7
8struct mirror_info {
9 mdk_rdev_t *rdev;
10 sector_t head_position;
11};
12
13/*
14 * memory pools need a pointer to the mddev, so they can force an unplug
15 * when memory is tight, and a count of the number of drives that the
16 * pool was allocated for, so they know how much to allocate and free.
17 * mddev->raid_disks cannot be used, as it can change while a pool is active
18 * These two datums are stored in a kmalloced struct.
19 */
20
21struct pool_info {
22 mddev_t *mddev;
23 int raid_disks;
24};
25
26
27typedef struct r1bio_s r1bio_t;
28
29struct r1_private_data_s {
30 mddev_t *mddev;
31 mirror_info_t *mirrors;
32 int raid_disks;
33 int working_disks;
34 int last_used;
35 sector_t next_seq_sect;
36 spinlock_t device_lock;
37
38 struct list_head retry_list;
NeilBrown191ea9b2005-06-21 17:17:23 -070039 /* queue pending writes and submit them on unplug */
40 struct bio_list pending_bio_list;
41 /* queue of writes that have been unplugged */
42 struct bio_list flushing_bio_list;
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 /* for use when syncing mirrors: */
45
46 spinlock_t resync_lock;
NeilBrown191ea9b2005-06-21 17:17:23 -070047 int nr_pending;
48 int barrier;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 sector_t next_resync;
NeilBrown191ea9b2005-06-21 17:17:23 -070050 int fullsync; /* set to 1 if a full sync is needed,
51 * (fresh device added).
52 * Cleared when a sync completes.
53 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55 wait_queue_head_t wait_idle;
56 wait_queue_head_t wait_resume;
57
58 struct pool_info *poolinfo;
59
60 mempool_t *r1bio_pool;
61 mempool_t *r1buf_pool;
62};
63
64typedef struct r1_private_data_s conf_t;
65
66/*
67 * this is the only point in the RAID code where we violate
68 * C type safety. mddev->private is an 'opaque' pointer.
69 */
70#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
71
72/*
73 * this is our 'private' RAID1 bio.
74 *
75 * it contains information about what kind of IO operations were started
76 * for this RAID1 operation, and about their status:
77 */
78
79struct r1bio_s {
80 atomic_t remaining; /* 'have we finished' count,
81 * used from IRQ handlers
82 */
NeilBrown4b6d2872005-09-09 16:23:47 -070083 atomic_t behind_remaining; /* number of write-behind ios remaining
84 * in this BehindIO request
85 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 sector_t sector;
87 int sectors;
88 unsigned long state;
89 mddev_t *mddev;
90 /*
91 * original bio going to /dev/mdx
92 */
93 struct bio *master_bio;
94 /*
95 * if the IO is in READ direction, then this is where we read
96 */
97 int read_disk;
98
99 struct list_head retry_list;
NeilBrown191ea9b2005-06-21 17:17:23 -0700100 struct bitmap_update *bitmap_update;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 /*
102 * if the IO is in WRITE direction, then multiple bios are used.
103 * We choose the number when they are allocated.
104 */
105 struct bio *bios[0];
NeilBrown191ea9b2005-06-21 17:17:23 -0700106 /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107};
108
109/* bits for r1bio.state */
110#define R1BIO_Uptodate 0
111#define R1BIO_IsSync 1
NeilBrown191ea9b2005-06-21 17:17:23 -0700112#define R1BIO_Degraded 2
NeilBrowna9701a32005-11-08 21:39:34 -0800113#define R1BIO_BehindIO 3
114#define R1BIO_Barrier 4
115#define R1BIO_BarrierRetry 5
NeilBrown4b6d2872005-09-09 16:23:47 -0700116/* For write-behind requests, we call bi_end_io when
117 * the last non-write-behind device completes, providing
118 * any write was successful. Otherwise we call when
119 * any write-behind write succeeds, otherwise we call
120 * with failure when last write completes (and all failed).
121 * Record that bi_end_io was called with this flag...
122 */
123#define R1BIO_Returned 4
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125#endif