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_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63)) 19 20 /* Bad block numbers are stored sorted in a single page. 21 * 64bits is used for each block or extent. 22 * 54 bits are sector number, 9 bits are extent size, 23 * 1 bit is an 'acknowledged' flag. 24 */ 25 #define MAX_BADBLOCKS (PAGE_SIZE/8) 26 27 struct badblocks { 28 struct device *dev; /* set by devm_init_badblocks */ 29 int count; /* count of bad blocks */ 30 int unacked_exist; /* there probably are unacknowledged 31 * bad blocks. This is only cleared 32 * when a read discovers none 33 */ 34 int shift; /* shift from sectors to block size 35 * a -ve shift means badblocks are 36 * disabled.*/ 37 u64 *page; /* badblock list */ 38 int changed; 39 seqlock_t lock; 40 sector_t sector; 41 sector_t size; /* in sectors */ 42 }; 43 44 int badblocks_check(struct badblocks *bb, sector_t s, int sectors, 45 sector_t *first_bad, int *bad_sectors); 46 int badblocks_set(struct badblocks *bb, sector_t s, int sectors, 47 int acknowledged); 48 int badblocks_clear(struct badblocks *bb, sector_t s, int sectors); 49 void ack_all_badblocks(struct badblocks *bb); 50 ssize_t badblocks_show(struct badblocks *bb, char *page, int unack); 51 ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len, 52 int unack); 53 int badblocks_init(struct badblocks *bb, int enable); 54 void badblocks_exit(struct badblocks *bb); 55 struct device; 56 int devm_init_badblocks(struct device *dev, struct badblocks *bb); 57 static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb) 58 { 59 if (bb->dev != dev) { 60 dev_WARN_ONCE(dev, 1, "%s: badblocks instance not associated\n", 61 __func__); 62 return; 63 } 64 badblocks_exit(bb); 65 } 66 #endif 67