1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_BADBLOCKS_H |
3 | #define _LINUX_BADBLOCKS_H |
4 | |
5 | #include <linux/seqlock.h> |
6 | #include <linux/device.h> |
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)) |
18 | #define BB_END(x) (BB_OFFSET(x) + BB_LEN(x)) |
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 { |
29 | struct device *dev; /* set by devm_init_badblocks */ |
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 | |
45 | struct badblocks_context { |
46 | sector_t start; |
47 | sector_t len; |
48 | int ack; |
49 | }; |
50 | |
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); |
61 | void badblocks_exit(struct badblocks *bb); |
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 | } |
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 | |
96 | #endif |
97 | |