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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)) | |
18 | #define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63)) | |
19 | ||
20 | /* Bad block numbers are stored sorted in a single page. | |
21 | * 64bits is used for each block or extent. | |
22 | * 54 bits are sector number, 9 bits are extent size, | |
23 | * 1 bit is an 'acknowledged' flag. | |
24 | */ | |
25 | #define MAX_BADBLOCKS (PAGE_SIZE/8) | |
26 | ||
27 | struct badblocks { | |
16263ff6 | 28 | struct device *dev; /* set by devm_init_badblocks */ |
9e0e252a VV |
29 | int count; /* count of bad blocks */ |
30 | int unacked_exist; /* there probably are unacknowledged | |
31 | * bad blocks. This is only cleared | |
32 | * when a read discovers none | |
33 | */ | |
34 | int shift; /* shift from sectors to block size | |
35 | * a -ve shift means badblocks are | |
36 | * disabled.*/ | |
37 | u64 *page; /* badblock list */ | |
38 | int changed; | |
39 | seqlock_t lock; | |
40 | sector_t sector; | |
41 | sector_t size; /* in sectors */ | |
42 | }; | |
43 | ||
44 | int badblocks_check(struct badblocks *bb, sector_t s, int sectors, | |
45 | sector_t *first_bad, int *bad_sectors); | |
46 | int badblocks_set(struct badblocks *bb, sector_t s, int sectors, | |
47 | int acknowledged); | |
48 | int badblocks_clear(struct badblocks *bb, sector_t s, int sectors); | |
49 | void ack_all_badblocks(struct badblocks *bb); | |
50 | ssize_t badblocks_show(struct badblocks *bb, char *page, int unack); | |
51 | ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len, | |
52 | int unack); | |
53 | int badblocks_init(struct badblocks *bb, int enable); | |
d3b407fb | 54 | void badblocks_exit(struct badblocks *bb); |
16263ff6 DW |
55 | struct device; |
56 | int devm_init_badblocks(struct device *dev, struct badblocks *bb); | |
57 | static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb) | |
58 | { | |
59 | if (bb->dev != dev) { | |
60 | dev_WARN_ONCE(dev, 1, "%s: badblocks instance not associated\n", | |
61 | __func__); | |
62 | return; | |
63 | } | |
64 | badblocks_exit(bb); | |
65 | } | |
9e0e252a | 66 | #endif |