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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _RAID1_H
2#define _RAID1_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004typedef struct mirror_info mirror_info_t;
5
6struct mirror_info {
7 mdk_rdev_t *rdev;
8 sector_t head_position;
9};
10
11/*
12 * memory pools need a pointer to the mddev, so they can force an unplug
13 * when memory is tight, and a count of the number of drives that the
14 * pool was allocated for, so they know how much to allocate and free.
15 * mddev->raid_disks cannot be used, as it can change while a pool is active
16 * These two datums are stored in a kmalloced struct.
17 */
18
19struct pool_info {
20 mddev_t *mddev;
21 int raid_disks;
22};
23
24
25typedef struct r1bio_s r1bio_t;
26
27struct r1_private_data_s {
28 mddev_t *mddev;
29 mirror_info_t *mirrors;
30 int raid_disks;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 int last_used;
32 sector_t next_seq_sect;
33 spinlock_t device_lock;
34
35 struct list_head retry_list;
NeilBrown191ea9b2005-06-21 17:17:23 -070036 /* queue pending writes and submit them on unplug */
37 struct bio_list pending_bio_list;
NeilBrown191ea9b2005-06-21 17:17:23 -070038
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 /* for use when syncing mirrors: */
40
41 spinlock_t resync_lock;
NeilBrown191ea9b2005-06-21 17:17:23 -070042 int nr_pending;
NeilBrown17999be2006-01-06 00:20:12 -080043 int nr_waiting;
NeilBrownddaf22a2006-01-06 00:20:19 -080044 int nr_queued;
NeilBrown191ea9b2005-06-21 17:17:23 -070045 int barrier;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 sector_t next_resync;
NeilBrown191ea9b2005-06-21 17:17:23 -070047 int fullsync; /* set to 1 if a full sync is needed,
48 * (fresh device added).
49 * Cleared when a sync completes.
50 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
NeilBrown17999be2006-01-06 00:20:12 -080052 wait_queue_head_t wait_barrier;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54 struct pool_info *poolinfo;
55
NeilBrownddaf22a2006-01-06 00:20:19 -080056 struct page *tmppage;
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 mempool_t *r1bio_pool;
59 mempool_t *r1buf_pool;
NeilBrown709ae482009-12-14 12:49:51 +110060
61 /* When taking over an array from a different personality, we store
62 * the new thread here until we fully activate the array.
63 */
64 struct mdk_thread_s *thread;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065};
66
67typedef struct r1_private_data_s conf_t;
68
69/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 * this is our 'private' RAID1 bio.
71 *
72 * it contains information about what kind of IO operations were started
73 * for this RAID1 operation, and about their status:
74 */
75
76struct r1bio_s {
77 atomic_t remaining; /* 'have we finished' count,
78 * used from IRQ handlers
79 */
NeilBrown4b6d2872005-09-09 16:23:47 -070080 atomic_t behind_remaining; /* number of write-behind ios remaining
81 * in this BehindIO request
82 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 sector_t sector;
84 int sectors;
85 unsigned long state;
86 mddev_t *mddev;
87 /*
88 * original bio going to /dev/mdx
89 */
90 struct bio *master_bio;
91 /*
92 * if the IO is in READ direction, then this is where we read
93 */
94 int read_disk;
95
96 struct list_head retry_list;
NeilBrownaf6d7b72011-05-11 14:51:19 +100097 /* Next two are only valid when R1BIO_BehindIO is set */
98 struct page **behind_pages;
99 int behind_page_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 /*
101 * if the IO is in WRITE direction, then multiple bios are used.
102 * We choose the number when they are allocated.
103 */
104 struct bio *bios[0];
NeilBrown191ea9b2005-06-21 17:17:23 -0700105 /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106};
107
NeilBrowncf30a472006-01-06 00:20:23 -0800108/* when we get a read error on a read-only array, we redirect to another
109 * device without failing the first device, or trying to over-write to
110 * correct the read error. To keep track of bad blocks on a per-bio
111 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
112 */
113#define IO_BLOCKED ((struct bio*)1)
114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115/* bits for r1bio.state */
116#define R1BIO_Uptodate 0
117#define R1BIO_IsSync 1
NeilBrown191ea9b2005-06-21 17:17:23 -0700118#define R1BIO_Degraded 2
NeilBrowna9701a32005-11-08 21:39:34 -0800119#define R1BIO_BehindIO 3
NeilBrown4b6d2872005-09-09 16:23:47 -0700120/* For write-behind requests, we call bi_end_io when
121 * the last non-write-behind device completes, providing
122 * any write was successful. Otherwise we call when
123 * any write-behind write succeeds, otherwise we call
124 * with failure when last write completes (and all failed).
125 * Record that bi_end_io was called with this flag...
126 */
NeilBrown9e71f9c2006-03-23 02:59:22 -0800127#define R1BIO_Returned 6
NeilBrown4b6d2872005-09-09 16:23:47 -0700128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129#endif