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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);
devm_exit_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