btree.h 2.0 KB

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  1. /* SPDX-License-Identifier: GPL-2.0+ */
  2. /*
  3. * btree.h - NILFS B-tree.
  4. *
  5. * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
  6. *
  7. * Written by Koji Sato.
  8. */
  9. #ifndef _NILFS_BTREE_H
  10. #define _NILFS_BTREE_H
  11. #include <linux/types.h>
  12. #include <linux/buffer_head.h>
  13. #include <linux/list.h>
  14. #include <linux/nilfs2_ondisk.h> /* nilfs_btree_node */
  15. #include "btnode.h"
  16. #include "bmap.h"
  17. /**
  18. * struct nilfs_btree_path - A path on which B-tree operations are executed
  19. * @bp_bh: buffer head of node block
  20. * @bp_sib_bh: buffer head of sibling node block
  21. * @bp_index: index of child node
  22. * @bp_oldreq: ptr end request for old ptr
  23. * @bp_newreq: ptr alloc request for new ptr
  24. * @bp_op: rebalance operation
  25. */
  26. struct nilfs_btree_path {
  27. struct buffer_head *bp_bh;
  28. struct buffer_head *bp_sib_bh;
  29. int bp_index;
  30. union nilfs_bmap_ptr_req bp_oldreq;
  31. union nilfs_bmap_ptr_req bp_newreq;
  32. struct nilfs_btnode_chkey_ctxt bp_ctxt;
  33. void (*bp_op)(struct nilfs_bmap *, struct nilfs_btree_path *,
  34. int, __u64 *, __u64 *);
  35. };
  36. #define NILFS_BTREE_ROOT_SIZE NILFS_BMAP_SIZE
  37. #define NILFS_BTREE_ROOT_NCHILDREN_MAX \
  38. ((NILFS_BTREE_ROOT_SIZE - sizeof(struct nilfs_btree_node)) / \
  39. (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */)))
  40. #define NILFS_BTREE_ROOT_NCHILDREN_MIN 0
  41. #define NILFS_BTREE_NODE_EXTRA_PAD_SIZE (sizeof(__le64))
  42. #define NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) \
  43. (((nodesize) - sizeof(struct nilfs_btree_node) - \
  44. NILFS_BTREE_NODE_EXTRA_PAD_SIZE) / \
  45. (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */)))
  46. #define NILFS_BTREE_NODE_NCHILDREN_MIN(nodesize) \
  47. ((NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) - 1) / 2 + 1)
  48. #define NILFS_BTREE_KEY_MIN ((__u64)0)
  49. #define NILFS_BTREE_KEY_MAX (~(__u64)0)
  50. extern struct kmem_cache *nilfs_btree_path_cache;
  51. int nilfs_btree_init(struct nilfs_bmap *);
  52. int nilfs_btree_convert_and_insert(struct nilfs_bmap *, __u64, __u64,
  53. const __u64 *, const __u64 *, int);
  54. void nilfs_btree_init_gc(struct nilfs_bmap *);
  55. int nilfs_btree_broken_node_block(struct buffer_head *bh);
  56. #endif /* _NILFS_BTREE_H */