fs/xfs/scrub/rcbag_btree.h

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2022-2024 Oracle.  All Rights Reserved.
   4  * Author: Darrick J. Wong <djwong@kernel.org>
   5  */
   6 #ifndef __XFS_SCRUB_RCBAG_BTREE_H__
   7 #define __XFS_SCRUB_RCBAG_BTREE_H__
   8
   9 #ifdef CONFIG_XFS_BTREE_IN_MEM
  10
  11 struct xfs_buf;
  12 struct xfs_btree_cur;
  13 struct xfs_mount;
  14
  15 #define RCBAG_MAGIC     0x74826671      /* 'JRBG' */
  16
  17 struct rcbag_key {
  18         uint32_t        rbg_startblock;
  19         uint32_t        rbg_blockcount;
  20 };
  21
  22 struct rcbag_rec {
  23         uint32_t        rbg_startblock;
  24         uint32_t        rbg_blockcount;
  25         uint64_t        rbg_refcount;
  26 };
  27
  28 typedef __be64 rcbag_ptr_t;
  29
  30 /* reflinks only exist on crc enabled filesystems */
  31 #define RCBAG_BLOCK_LEN XFS_BTREE_LBLOCK_CRC_LEN
  32
  33 /*
  34  * Record, key, and pointer address macros for btree blocks.
  35  *
  36  * (note that some of these may appear unused, but they are used in userspace)
  37  */
  38 #define RCBAG_REC_ADDR(block, index) \
  39         ((struct rcbag_rec *) \
  40                 ((char *)(block) + RCBAG_BLOCK_LEN + \
  41                  (((index) - 1) * sizeof(struct rcbag_rec))))
  42
  43 #define RCBAG_KEY_ADDR(block, index) \
  44         ((struct rcbag_key *) \
  45                 ((char *)(block) + RCBAG_BLOCK_LEN + \
  46                  ((index) - 1) * sizeof(struct rcbag_key)))
  47
  48 #define RCBAG_PTR_ADDR(block, index, maxrecs) \
  49         ((rcbag_ptr_t *) \
  50                 ((char *)(block) + RCBAG_BLOCK_LEN + \
  51                  (maxrecs) * sizeof(struct rcbag_key) + \
  52                  ((index) - 1) * sizeof(rcbag_ptr_t)))
  53
  54 unsigned int rcbagbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen,
  55                 bool leaf);
  56
  57 unsigned long long rcbagbt_calc_size(unsigned long long nr_records);
  58
  59 unsigned int rcbagbt_maxlevels_possible(void);
  60
  61 int __init rcbagbt_init_cur_cache(void);
  62 void rcbagbt_destroy_cur_cache(void);
  63
  64 struct xfs_btree_cur *rcbagbt_mem_cursor(struct xfs_mount *mp,
  65                 struct xfs_trans *tp, struct xfbtree *xfbtree);
  66 int rcbagbt_mem_init(struct xfs_mount *mp, struct xfbtree *xfbtree,
  67                 struct xfs_buftarg *btp);
  68
  69 int rcbagbt_lookup_eq(struct xfs_btree_cur *cur,
  70                 const struct xfs_rmap_irec *rmap, int *success);
  71 int rcbagbt_get_rec(struct xfs_btree_cur *cur, struct rcbag_rec *rec, int *has);
  72 int rcbagbt_update(struct xfs_btree_cur *cur, const struct rcbag_rec *rec);
  73 int rcbagbt_insert(struct xfs_btree_cur *cur, const struct rcbag_rec *rec,
  74                 int *success);
  75
  76 #else
  77 # define rcbagbt_init_cur_cache()               0
  78 # define rcbagbt_destroy_cur_cache()            ((void)0)
  79 #endif /* CONFIG_XFS_BTREE_IN_MEM */
  80
  81 #endif /* __XFS_SCRUB_RCBAG_BTREE_H__ */