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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_BADBLOCKS_H
3 #define _LINUX_BADBLOCKS_H
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>
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))
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.
25 #define MAX_BADBLOCKS (PAGE_SIZE/8)
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
34 int shift
; /* shift from sectors to block size
35 * a -ve shift means badblocks are
37 u64
*page
; /* badblock list */
41 sector_t size
; /* in sectors */
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
,
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
,
53 int badblocks_init(struct badblocks
*bb
, int enable
);
54 void badblocks_exit(struct badblocks
*bb
);
56 int devm_init_badblocks(struct device
*dev
, struct badblocks
*bb
);
57 static inline void devm_exit_badblocks(struct device
*dev
, struct badblocks
*bb
)
60 dev_WARN_ONCE(dev
, 1, "%s: badblocks instance not associated\n",