badblocks.h 2.1 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. #ifndef _LINUX_BADBLOCKS_H
  3. #define _LINUX_BADBLOCKS_H
  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. #define BB_LEN_MASK (0x00000000000001FFULL)
  10. #define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL)
  11. #define BB_ACK_MASK (0x8000000000000000ULL)
  12. #define BB_MAX_LEN 512
  13. #define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9)
  14. #define BB_LEN(x) (((x) & BB_LEN_MASK) + 1)
  15. #define BB_ACK(x) (!!((x) & BB_ACK_MASK))
  16. #define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
  17. /* Bad block numbers are stored sorted in a single page.
  18. * 64bits is used for each block or extent.
  19. * 54 bits are sector number, 9 bits are extent size,
  20. * 1 bit is an 'acknowledged' flag.
  21. */
  22. #define MAX_BADBLOCKS (PAGE_SIZE/8)
  23. struct badblocks {
  24. struct device *dev; /* set by devm_init_badblocks */
  25. int count; /* count of bad blocks */
  26. int unacked_exist; /* there probably are unacknowledged
  27. * bad blocks. This is only cleared
  28. * when a read discovers none
  29. */
  30. int shift; /* shift from sectors to block size
  31. * a -ve shift means badblocks are
  32. * disabled.*/
  33. u64 *page; /* badblock list */
  34. int changed;
  35. seqlock_t lock;
  36. sector_t sector;
  37. sector_t size; /* in sectors */
  38. };
  39. int badblocks_check(struct badblocks *bb, sector_t s, int sectors,
  40. sector_t *first_bad, int *bad_sectors);
  41. int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
  42. int acknowledged);
  43. int badblocks_clear(struct badblocks *bb, sector_t s, int sectors);
  44. void ack_all_badblocks(struct badblocks *bb);
  45. ssize_t badblocks_show(struct badblocks *bb, char *page, int unack);
  46. ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len,
  47. int unack);
  48. int badblocks_init(struct badblocks *bb, int enable);
  49. void badblocks_exit(struct badblocks *bb);
  50. struct device;
  51. int devm_init_badblocks(struct device *dev, struct badblocks *bb);
  52. static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb)
  53. {
  54. if (bb->dev != dev) {
  55. dev_WARN_ONCE(dev, 1, "%s: badblocks instance not associated\n",
  56. __func__);
  57. return;
  58. }
  59. badblocks_exit(bb);
  60. }
  61. #endif