| 1 |
|
| 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 | |
| 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;
|
| 29 | int count;
|
| 30 | int unacked_exist; |
| 31 | * bad blocks. This is only cleared
|
| 32 | * when a read discovers none
|
| 33 |
|
| 34 | int shift; |
| 35 | * a -ve shift means badblocks are
|
| 36 | * disabled.
|
| 37 | u64 *page;
|
| 38 | int changed;
|
| 39 | seqlock_t lock;
|
| 40 | sector_t sector;
|
| 41 | sector_t size;
|
| 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
|