]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - drivers/md/raid10.h
md/raid10: avoid writing to known bad blocks on known bad drives.
[mirror_ubuntu-bionic-kernel.git] / drivers / md / raid10.h
CommitLineData
1da177e4
LT
1#ifndef _RAID10_H
2#define _RAID10_H
3
1da177e4
LT
4typedef struct mirror_info mirror_info_t;
5
6struct mirror_info {
7 mdk_rdev_t *rdev;
8 sector_t head_position;
2bb77736
N
9 int recovery_disabled; /* matches
10 * mddev->recovery_disabled
11 * when we shouldn't try
12 * recovering this device.
13 */
1da177e4
LT
14};
15
16typedef struct r10bio_s r10bio_t;
17
18struct r10_private_data_s {
19 mddev_t *mddev;
20 mirror_info_t *mirrors;
21 int raid_disks;
1da177e4
LT
22 spinlock_t device_lock;
23
24 /* geometry */
25985edc
LDM
25 int near_copies; /* number of copies laid out raid0 style */
26 int far_copies; /* number of copies laid out
1da177e4
LT
27 * at large strides across drives
28 */
c93983bf
N
29 int far_offset; /* far_copies are offset by 1 stripe
30 * instead of many
31 */
1da177e4
LT
32 int copies; /* near_copies * far_copies.
33 * must be <= raid_disks
34 */
35 sector_t stride; /* distance between far copies.
c93983bf
N
36 * This is size / far_copies unless
37 * far_offset, in which case it is
38 * 1 stripe.
1da177e4
LT
39 */
40
dab8b292
TM
41 sector_t dev_sectors; /* temp copy of mddev->dev_sectors */
42
1da177e4
LT
43 int chunk_shift; /* shift from chunks to sectors */
44 sector_t chunk_mask;
45
46 struct list_head retry_list;
6cce3b23
N
47 /* queue pending writes and submit them on unplug */
48 struct bio_list pending_bio_list;
49
1da177e4
LT
50
51 spinlock_t resync_lock;
52 int nr_pending;
0a27ec96 53 int nr_waiting;
4443ae10 54 int nr_queued;
1da177e4
LT
55 int barrier;
56 sector_t next_resync;
6cce3b23
N
57 int fullsync; /* set to 1 if a full sync is needed,
58 * (fresh device added).
59 * Cleared when a sync completes.
60 */
1da177e4 61
0a27ec96 62 wait_queue_head_t wait_barrier;
1da177e4
LT
63
64 mempool_t *r10bio_pool;
65 mempool_t *r10buf_pool;
4443ae10 66 struct page *tmppage;
dab8b292
TM
67
68 /* When taking over an array from a different personality, we store
69 * the new thread here until we fully activate the array.
70 */
71 struct mdk_thread_s *thread;
1da177e4
LT
72};
73
74typedef struct r10_private_data_s conf_t;
75
1da177e4
LT
76/*
77 * this is our 'private' RAID10 bio.
78 *
79 * it contains information about what kind of IO operations were started
80 * for this RAID10 operation, and about their status:
81 */
82
83struct r10bio_s {
84 atomic_t remaining; /* 'have we finished' count,
85 * used from IRQ handlers
86 */
87 sector_t sector; /* virtual sector number */
88 int sectors;
89 unsigned long state;
90 mddev_t *mddev;
91 /*
92 * original bio going to /dev/mdx
93 */
94 struct bio *master_bio;
95 /*
96 * if the IO is in READ direction, then this is where we read
97 */
98 int read_slot;
99
100 struct list_head retry_list;
101 /*
102 * if the IO is in WRITE direction, then multiple bios are used,
103 * one for each copy.
104 * When resyncing we also use one for each copy.
105 * When reconstructing, we use 2 bios, one for read, one for write.
106 * We choose the number when they are allocated.
107 */
108 struct {
109 struct bio *bio;
110 sector_t addr;
111 int devnum;
112 } devs[0];
113};
114
0eb3ff12
N
115/* when we get a read error on a read-only array, we redirect to another
116 * device without failing the first device, or trying to over-write to
117 * correct the read error. To keep track of bad blocks on a per-bio
118 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
119 */
120#define IO_BLOCKED ((struct bio*)1)
121
1da177e4
LT
122/* bits for r10bio.state */
123#define R10BIO_Uptodate 0
124#define R10BIO_IsSync 1
125#define R10BIO_IsRecover 2
6cce3b23 126#define R10BIO_Degraded 3
856e08e2
N
127/* Set ReadError on bios that experience a read error
128 * so that raid10d knows what to do with them.
129 */
130#define R10BIO_ReadError 4
1da177e4 131#endif