/* 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_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