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 28struct 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 45struct badblocks_context { 46 sector_t start; 47 sector_t len; 48 int ack; 49}; 50 51int badblocks_check(struct badblocks *bb, sector_t s, int sectors, 52 sector_t *first_bad, int *bad_sectors); 53int badblocks_set(struct badblocks *bb, sector_t s, int sectors, 54 int acknowledged); 55int badblocks_clear(struct badblocks *bb, sector_t s, int sectors); 56void ack_all_badblocks(struct badblocks *bb); 57ssize_t badblocks_show(struct badblocks *bb, char *page, int unack); 58ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len, 59 int unack); 60int badblocks_init(struct badblocks *bb, int enable); 61void badblocks_exit(struct badblocks *bb); 62struct device; 63int devm_init_badblocks(struct device *dev, struct badblocks *bb); 64static 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 74static inline int badblocks_full(struct badblocks *bb) 75{ 76 return (bb->count >= MAX_BADBLOCKS); 77} 78 79static inline int badblocks_empty(struct badblocks *bb) 80{ 81 return (bb->count == 0); 82} 83 84static inline void set_changed(struct badblocks *bb) 85{ 86 if (bb->changed != 1) 87 bb->changed = 1; 88} 89 90static inline void clear_changed(struct badblocks *bb) 91{ 92 if (bb->changed != 0) 93 bb->changed = 0; 94} 95 96#endif 97