projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 9e0e252a VV |
2 | #ifndef _LINUX_BADBLOCKS_H |
| 3 | #define _LINUX_BADBLOCKS_H | |
| 4 | ||
| 5 | #include <linux/seqlock.h> | |
| 16263ff6 | 6 | #include <linux/device.h> |
| 9e0e252a VV |
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 { | |
| 16263ff6 | 28 | struct device *dev; /* set by devm_init_badblocks */ |
| 9e0e252a VV |
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); | |
| d3b407fb | 54 | void badblocks_exit(struct badblocks *bb); |
| 16263ff6 DW |
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 | } | |
| 9e0e252a | 66 | #endif |