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1 | #ifndef _LINUX_BADBLOCKS_H |
2 | #define _LINUX_BADBLOCKS_H | |
3 | ||
4 | #include <linux/seqlock.h> | |
5 | #include <linux/kernel.h> | |
6 | #include <linux/stddef.h> | |
7 | #include <linux/types.h> | |
8 | ||
9 | #define BB_LEN_MASK (0x00000000000001FFULL) | |
10 | #define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL) | |
11 | #define BB_ACK_MASK (0x8000000000000000ULL) | |
12 | #define BB_MAX_LEN 512 | |
13 | #define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9) | |
14 | #define BB_LEN(x) (((x) & BB_LEN_MASK) + 1) | |
15 | #define BB_ACK(x) (!!((x) & BB_ACK_MASK)) | |
16 | #define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63)) | |
17 | ||
18 | /* Bad block numbers are stored sorted in a single page. | |
19 | * 64bits is used for each block or extent. | |
20 | * 54 bits are sector number, 9 bits are extent size, | |
21 | * 1 bit is an 'acknowledged' flag. | |
22 | */ | |
23 | #define MAX_BADBLOCKS (PAGE_SIZE/8) | |
24 | ||
25 | struct badblocks { | |
26 | int count; /* count of bad blocks */ | |
27 | int unacked_exist; /* there probably are unacknowledged | |
28 | * bad blocks. This is only cleared | |
29 | * when a read discovers none | |
30 | */ | |
31 | int shift; /* shift from sectors to block size | |
32 | * a -ve shift means badblocks are | |
33 | * disabled.*/ | |
34 | u64 *page; /* badblock list */ | |
35 | int changed; | |
36 | seqlock_t lock; | |
37 | sector_t sector; | |
38 | sector_t size; /* in sectors */ | |
39 | }; | |
40 | ||
41 | int badblocks_check(struct badblocks *bb, sector_t s, int sectors, | |
42 | sector_t *first_bad, int *bad_sectors); | |
43 | int badblocks_set(struct badblocks *bb, sector_t s, int sectors, | |
44 | int acknowledged); | |
45 | int badblocks_clear(struct badblocks *bb, sector_t s, int sectors); | |
46 | void ack_all_badblocks(struct badblocks *bb); | |
47 | ssize_t badblocks_show(struct badblocks *bb, char *page, int unack); | |
48 | ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len, | |
49 | int unack); | |
50 | int badblocks_init(struct badblocks *bb, int enable); | |
51 | void badblocks_free(struct badblocks *bb); | |
52 | ||
53 | #endif |