1 #ifndef _LINUX_BADBLOCKS_H 2 #define _LINUX_BADBLOCKS_H 3 4 #include <linux/seqlock.h> 5 #include <linux/device.h> 6 #include <linux/kernel.h> 7 #include <linux/stddef.h> 8 #include <linux/types.h> 9 10 #define BB_LEN_MASK (0x00000000000001FFULL) 11 #define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL) 12 #define BB_ACK_MASK (0x8000000000000000ULL) 13 #define BB_MAX_LEN 512 14 #define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9) 15 #define BB_LEN(x) (((x) & BB_LEN_MASK) + 1) 16 #define BB_ACK(x) (!!((x) & BB_ACK_MASK)) 17 #define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63)) 18 19 /* Bad block numbers are stored sorted in a single page. 20 * 64bits is used for each block or extent. 21 * 54 bits are sector number, 9 bits are extent size, 22 * 1 bit is an 'acknowledged' flag. 23 */ 24 #define MAX_BADBLOCKS (PAGE_SIZE/8) 25 26 struct badblocks { 27 struct device *dev; /* set by devm_init_badblocks */ 28 int count; /* count of bad blocks */ 29 int unacked_exist; /* there probably are unacknowledged 30 * bad blocks. This is only cleared 31 * when a read discovers none 32 */ 33 int shift; /* shift from sectors to block size 34 * a -ve shift means badblocks are 35 * disabled.*/ 36 u64 *page; /* badblock list */ 37 int changed; 38 seqlock_t lock; 39 sector_t sector; 40 sector_t size; /* in sectors */ 41 }; 42 43 int badblocks_check(struct badblocks *bb, sector_t s, int sectors, 44 sector_t *first_bad, int *bad_sectors); 45 int badblocks_set(struct badblocks *bb, sector_t s, int sectors, 46 int acknowledged); 47 int badblocks_clear(struct badblocks *bb, sector_t s, int sectors); 48 void ack_all_badblocks(struct badblocks *bb); 49 ssize_t badblocks_show(struct badblocks *bb, char *page, int unack); 50 ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len, 51 int unack); 52 int badblocks_init(struct badblocks *bb, int enable); 53 void badblocks_exit(struct badblocks *bb); 54 struct device; 55 int devm_init_badblocks(struct device *dev, struct badblocks *bb); 56 static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb) 57 { 58 if (bb->dev != dev) { 59 dev_WARN_ONCE(dev, 1, "%s: badblocks instance not associated\n", 60 __func__); 61 return; 62 } 63 badblocks_exit(bb); 64 } 65 #endif 66