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libxfs
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xfs_rmap_btree.h

xfs_rmap_btree.h 2.2 KB
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  1. // SPDX-License-Identifier: GPL-2.0
    2. 

  2. /*
    3. 

  3.  * Copyright (c) 2014 Red Hat, Inc.
    4. 

  4.  * All Rights Reserved.
    5. 

  5.  */
    6. 

  6. #ifndef __XFS_RMAP_BTREE_H__
    7. 

  7. #define __XFS_RMAP_BTREE_H__
    8. 

  8. 

  9. struct xfs_buf;
    10. 

  10. struct xfs_btree_cur;
    11. 

  11. struct xfs_mount;
    12. 

  12. struct xbtree_afakeroot;
    13. 

  13. 

  14. /* rmaps only exist on crc enabled filesystems */
    15. 

  15. #define XFS_RMAP_BLOCK_LEN	XFS_BTREE_SBLOCK_CRC_LEN
    16. 

  16. 

  17. /*
    18. 

  18.  * Record, key, and pointer address macros for btree blocks.
    19. 

  19.  *
    20. 

  20.  * (note that some of these may appear unused, but they are used in userspace)
    21. 

  21.  */
    22. 

  22. #define XFS_RMAP_REC_ADDR(block, index) \
    23. 

  23. 	((struct xfs_rmap_rec *) \
    24. 

  24. 		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
    25. 

  25. 		 (((index) - 1) * sizeof(struct xfs_rmap_rec))))
    26. 

  26. 

  27. #define XFS_RMAP_KEY_ADDR(block, index) \
    28. 

  28. 	((struct xfs_rmap_key *) \
    29. 

  29. 		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
    30. 

  30. 		 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
    31. 

  31. 

  32. #define XFS_RMAP_HIGH_KEY_ADDR(block, index) \
    33. 

  33. 	((struct xfs_rmap_key *) \
    34. 

  34. 		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
    35. 

  35. 		 sizeof(struct xfs_rmap_key) + \
    36. 

  36. 		 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
    37. 

  37. 

  38. #define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \
    39. 

  39. 	((xfs_rmap_ptr_t *) \
    40. 

  40. 		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
    41. 

  41. 		 (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \
    42. 

  42. 		 ((index) - 1) * sizeof(xfs_rmap_ptr_t)))
    43. 

  43. 

  44. struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp,
    45. 

  45. 				struct xfs_trans *tp, struct xfs_buf *bp,
    46. 

  46. 				struct xfs_perag *pag);
    47. 

  47. struct xfs_btree_cur *xfs_rmapbt_stage_cursor(struct xfs_mount *mp,
    48. 

  48. 		struct xbtree_afakeroot *afake, struct xfs_perag *pag);
    49. 

  49. void xfs_rmapbt_commit_staged_btree(struct xfs_btree_cur *cur,
    50. 

  50. 		struct xfs_trans *tp, struct xfs_buf *agbp);
    51. 

  51. int xfs_rmapbt_maxrecs(int blocklen, int leaf);
    52. 

  52. extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp);
    53. 

  53. 

  54. extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp,
    55. 

  55. 		unsigned long long len);
    56. 

  56. extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp,
    57. 

  57. 		xfs_agblock_t agblocks);
    58. 

  58. 

  59. extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp, struct xfs_trans *tp,
    60. 

  60. 		struct xfs_perag *pag, xfs_extlen_t *ask, xfs_extlen_t *used);
    61. 

  61. 

  62. unsigned int xfs_rmapbt_maxlevels_ondisk(void);
    63. 

  63. 

  64. int __init xfs_rmapbt_init_cur_cache(void);
    65. 

  65. void xfs_rmapbt_destroy_cur_cache(void);
    66. 

  66. 

  67. #endif /* __XFS_RMAP_BTREE_H__ */
    68.