LXR linux/include/linux/badblocks.h

   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
  26struct 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
  43int badblocks_check(struct badblocks *bb, sector_t s, int sectors,
  44                   sector_t *first_bad, int *bad_sectors);
  45int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
  46                        int acknowledged);
  47int badblocks_clear(struct badblocks *bb, sector_t s, int sectors);
  48void ack_all_badblocks(struct badblocks *bb);
  49ssize_t badblocks_show(struct badblocks *bb, char *page, int unack);
  50ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len,
  51                        int unack);
  52int badblocks_init(struct badblocks *bb, int enable);
  53void badblocks_exit(struct badblocks *bb);
  54struct device;
  55int devm_init_badblocks(struct device *dev, struct badblocks *bb);
  56static 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