97 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _LINUX_BADBLOCKS_H3#define _LINUX_BADBLOCKS_H4 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 51215#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 unacknowledged32 * bad blocks. This is only cleared33 * when a read discovers none34 */35 int shift; /* shift from sectors to block size36 * a -ve shift means badblocks are37 * 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#endif97