Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _RAID10_H
3#define _RAID10_H
4
5struct raid10_info {
6 struct md_rdev *rdev, *replacement;
7 sector_t head_position;
8 int recovery_disabled; /* matches
9 * mddev->recovery_disabled
10 * when we shouldn't try
11 * recovering this device.
12 */
13};
14
15struct r10conf {
16 struct mddev *mddev;
17 struct raid10_info *mirrors;
18 struct raid10_info *mirrors_new, *mirrors_old;
19 spinlock_t device_lock;
20
21 /* geometry */
22 struct geom {
23 int raid_disks;
24 int near_copies; /* number of copies laid out
25 * raid0 style */
26 int far_copies; /* number of copies laid out
27 * at large strides across drives
28 */
29 int far_offset; /* far_copies are offset by 1
30 * stripe instead of many
31 */
32 sector_t stride; /* distance between far copies.
33 * This is size / far_copies unless
34 * far_offset, in which case it is
35 * 1 stripe.
36 */
37 int far_set_size; /* The number of devices in a set,
38 * where a 'set' are devices that
39 * contain far/offset copies of
40 * each other.
41 */
42 int chunk_shift; /* shift from chunks to sectors */
43 sector_t chunk_mask;
44 } prev, geo;
45 int copies; /* near_copies * far_copies.
46 * must be <= raid_disks
47 */
48
49 sector_t dev_sectors; /* temp copy of
50 * mddev->dev_sectors */
51 sector_t reshape_progress;
52 sector_t reshape_safe;
53 unsigned long reshape_checkpoint;
54 sector_t offset_diff;
55
56 struct list_head retry_list;
57 /* A separate list of r1bio which just need raid_end_bio_io called.
58 * This mustn't happen for writes which had any errors if the superblock
59 * needs to be written.
60 */
61 struct list_head bio_end_io_list;
62
63 /* queue pending writes and submit them on unplug */
64 struct bio_list pending_bio_list;
65 int pending_count;
66
67 spinlock_t resync_lock;
68 atomic_t nr_pending;
69 int nr_waiting;
70 int nr_queued;
71 int barrier;
72 int array_freeze_pending;
73 sector_t next_resync;
74 int fullsync; /* set to 1 if a full sync is needed,
75 * (fresh device added).
76 * Cleared when a sync completes.
77 */
78 int have_replacement; /* There is at least one
79 * replacement device.
80 */
81 wait_queue_head_t wait_barrier;
82
83 mempool_t *r10bio_pool;
84 mempool_t *r10buf_pool;
85 struct page *tmppage;
86 struct bio_set *bio_split;
87
88 /* When taking over an array from a different personality, we store
89 * the new thread here until we fully activate the array.
90 */
91 struct md_thread *thread;
92
93 /*
94 * Keep track of cluster resync window to send to other nodes.
95 */
96 sector_t cluster_sync_low;
97 sector_t cluster_sync_high;
98};
99
100/*
101 * this is our 'private' RAID10 bio.
102 *
103 * it contains information about what kind of IO operations were started
104 * for this RAID10 operation, and about their status:
105 */
106
107struct r10bio {
108 atomic_t remaining; /* 'have we finished' count,
109 * used from IRQ handlers
110 */
111 sector_t sector; /* virtual sector number */
112 int sectors;
113 unsigned long state;
114 struct mddev *mddev;
115 /*
116 * original bio going to /dev/mdx
117 */
118 struct bio *master_bio;
119 /*
120 * if the IO is in READ direction, then this is where we read
121 */
122 int read_slot;
123
124 struct list_head retry_list;
125 /*
126 * if the IO is in WRITE direction, then multiple bios are used,
127 * one for each copy.
128 * When resyncing we also use one for each copy.
129 * When reconstructing, we use 2 bios, one for read, one for write.
130 * We choose the number when they are allocated.
131 * We sometimes need an extra bio to write to the replacement.
132 */
133 struct r10dev {
134 struct bio *bio;
135 union {
136 struct bio *repl_bio; /* used for resync and
137 * writes */
138 struct md_rdev *rdev; /* used for reads
139 * (read_slot >= 0) */
140 };
141 sector_t addr;
142 int devnum;
143 } devs[0];
144};
145
146/* bits for r10bio.state */
147enum r10bio_state {
148 R10BIO_Uptodate,
149 R10BIO_IsSync,
150 R10BIO_IsRecover,
151 R10BIO_IsReshape,
152 R10BIO_Degraded,
153/* Set ReadError on bios that experience a read error
154 * so that raid10d knows what to do with them.
155 */
156 R10BIO_ReadError,
157/* If a write for this request means we can clear some
158 * known-bad-block records, we set this flag.
159 */
160 R10BIO_MadeGood,
161 R10BIO_WriteError,
162/* During a reshape we might be performing IO on the
163 * 'previous' part of the array, in which case this
164 * flag is set
165 */
166 R10BIO_Previous,
167/* failfast devices did receive failfast requests. */
168 R10BIO_FailFast,
169};
170#endif