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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9e0e252a VV |
2 | #ifndef _LINUX_BADBLOCKS_H |
3 | #define _LINUX_BADBLOCKS_H | |
4 | ||
5 | #include <linux/seqlock.h> | |
16263ff6 | 6 | #include <linux/device.h> |
9e0e252a VV |
7 | #include <linux/kernel.h> |
8 | #include <linux/stddef.h> | |
9 | #include <linux/types.h> | |
10 | ||
11 | #define BB_LEN_MASK (0x00000000000001FFULL) | |
12 | #define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL) | |
13 | #define BB_ACK_MASK (0x8000000000000000ULL) | |
14 | #define BB_MAX_LEN 512 | |
15 | #define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9) | |
16 | #define BB_LEN(x) (((x) & BB_LEN_MASK) + 1) | |
17 | #define BB_ACK(x) (!!((x) & BB_ACK_MASK)) | |
e850d9a5 | 18 | #define BB_END(x) (BB_OFFSET(x) + BB_LEN(x)) |
9e0e252a VV |
19 | #define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63)) |
20 | ||
21 | /* Bad block numbers are stored sorted in a single page. | |
22 | * 64bits is used for each block or extent. | |
23 | * 54 bits are sector number, 9 bits are extent size, | |
24 | * 1 bit is an 'acknowledged' flag. | |
25 | */ | |
26 | #define MAX_BADBLOCKS (PAGE_SIZE/8) | |
27 | ||
28 | struct badblocks { | |
16263ff6 | 29 | struct device *dev; /* set by devm_init_badblocks */ |
9e0e252a VV |
30 | int count; /* count of bad blocks */ |
31 | int unacked_exist; /* there probably are unacknowledged | |
32 | * bad blocks. This is only cleared | |
33 | * when a read discovers none | |
34 | */ | |
35 | int shift; /* shift from sectors to block size | |
36 | * a -ve shift means badblocks are | |
37 | * disabled.*/ | |
38 | u64 *page; /* badblock list */ | |
39 | int changed; | |
40 | seqlock_t lock; | |
41 | sector_t sector; | |
42 | sector_t size; /* in sectors */ | |
43 | }; | |
44 | ||
e850d9a5 CL |
45 | struct badblocks_context { |
46 | sector_t start; | |
47 | sector_t len; | |
48 | int ack; | |
49 | }; | |
50 | ||
9e0e252a VV |
51 | int badblocks_check(struct badblocks *bb, sector_t s, int sectors, |
52 | sector_t *first_bad, int *bad_sectors); | |
53 | int badblocks_set(struct badblocks *bb, sector_t s, int sectors, | |
54 | int acknowledged); | |
55 | int badblocks_clear(struct badblocks *bb, sector_t s, int sectors); | |
56 | void ack_all_badblocks(struct badblocks *bb); | |
57 | ssize_t badblocks_show(struct badblocks *bb, char *page, int unack); | |
58 | ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len, | |
59 | int unack); | |
60 | int badblocks_init(struct badblocks *bb, int enable); | |
d3b407fb | 61 | void badblocks_exit(struct badblocks *bb); |
16263ff6 DW |
62 | struct device; |
63 | int devm_init_badblocks(struct device *dev, struct badblocks *bb); | |
64 | static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb) | |
65 | { | |
66 | if (bb->dev != dev) { | |
67 | dev_WARN_ONCE(dev, 1, "%s: badblocks instance not associated\n", | |
68 | __func__); | |
69 | return; | |
70 | } | |
71 | badblocks_exit(bb); | |
72 | } | |
e850d9a5 CL |
73 | |
74 | static inline int badblocks_full(struct badblocks *bb) | |
75 | { | |
76 | return (bb->count >= MAX_BADBLOCKS); | |
77 | } | |
78 | ||
79 | static inline int badblocks_empty(struct badblocks *bb) | |
80 | { | |
81 | return (bb->count == 0); | |
82 | } | |
83 | ||
84 | static inline void set_changed(struct badblocks *bb) | |
85 | { | |
86 | if (bb->changed != 1) | |
87 | bb->changed = 1; | |
88 | } | |
89 | ||
90 | static inline void clear_changed(struct badblocks *bb) | |
91 | { | |
92 | if (bb->changed != 0) | |
93 | bb->changed = 0; | |
94 | } | |
95 | ||
9e0e252a | 96 | #endif |