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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_BADBLOCKS_H#define _LINUX_BADBLOCKS_H
#include <linux/seqlock.h>#include <linux/device.h>#include <linux/kernel.h>#include <linux/stddef.h>#include <linux/types.h>
#define BB_LEN_MASK (0x00000000000001FFULL)#define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL)#define BB_ACK_MASK (0x8000000000000000ULL)#define BB_MAX_LEN 512#define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9)#define BB_LEN(x) (((x) & BB_LEN_MASK) + 1)#define BB_ACK(x) (!!((x) & BB_ACK_MASK))#define BB_END(x) (BB_OFFSET(x) + BB_LEN(x))#define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
/* Bad block numbers are stored sorted in a single page. * 64bits is used for each block or extent. * 54 bits are sector number, 9 bits are extent size, * 1 bit is an 'acknowledged' flag. */#define MAX_BADBLOCKS (PAGE_SIZE/8)
struct badblocks { struct device *dev; /* set by devm_init_badblocks */ int count; /* count of bad blocks */ int unacked_exist; /* there probably are unacknowledged * bad blocks. This is only cleared * when a read discovers none */ int shift; /* shift from sectors to block size * a -ve shift means badblocks are * disabled.*/ u64 *page; /* badblock list */ int changed; seqlock_t lock; sector_t sector; sector_t size; /* in sectors */};
struct badblocks_context { sector_t start; sector_t len; int ack;};
int badblocks_check(struct badblocks *bb, sector_t s, sector_t sectors, sector_t *first_bad, sector_t *bad_sectors);bool badblocks_set(struct badblocks *bb, sector_t s, sector_t sectors, int acknowledged);bool badblocks_clear(struct badblocks *bb, sector_t s, sector_t sectors);void ack_all_badblocks(struct badblocks *bb);ssize_t badblocks_show(struct badblocks *bb, char *page, int unack);ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);int badblocks_init(struct badblocks *bb, int enable);void badblocks_exit(struct badblocks *bb);struct device;int devm_init_badblocks(struct device *dev, struct badblocks *bb);static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb){ if (bb->dev != dev) { dev_WARN_ONCE(dev, 1, "%s: badblocks instance not associated\n", __func__); return; } badblocks_exit(bb);}
static inline int badblocks_full(struct badblocks *bb){ return (bb->count >= MAX_BADBLOCKS);}
static inline int badblocks_empty(struct badblocks *bb){ return (bb->count == 0);}
static inline void set_changed(struct badblocks *bb){ if (bb->changed != 1) bb->changed = 1;}
static inline void clear_changed(struct badblocks *bb){ if (bb->changed != 0) bb->changed = 0;}
#endif