#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_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 */}; int badblocks_check(struct badblocks *bb, sector_t s, int sectors,		   sector_t *first_bad, int *bad_sectors);int badblocks_set(struct badblocks *bb, sector_t s, int sectors,			int acknowledged);int badblocks_clear(struct badblocks *bb, sector_t s, int 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);}#endif