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_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 { |
28 | struct device *dev; /* set by devm_init_badblocks */ |
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); |
54 | void badblocks_exit(struct badblocks *bb); |
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 | } |
66 | #endif |
67 | |