libxfs/xfs_ialloc.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_IALLOC_H__
   7 #define __XFS_IALLOC_H__
   8
   9 struct xfs_buf;
  10 struct xfs_dinode;
  11 struct xfs_imap;
  12 struct xfs_mount;
  13 struct xfs_trans;
  14 struct xfs_btree_cur;
  15 struct xfs_perag;
  16
  17 /* Move inodes in clusters of this size */
  18 #define XFS_INODE_BIG_CLUSTER_SIZE      8192
  19
  20 struct xfs_icluster {
  21         bool            deleted;        /* record is deleted */
  22         xfs_ino_t       first_ino;      /* first inode number */
  23         uint64_t        alloc;          /* inode phys. allocation bitmap for
  24                                          * sparse chunks */
  25 };
  26
  27 /*
  28  * Make an inode pointer out of the buffer/offset.
  29  */
  30 static inline struct xfs_dinode *
  31 xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
  32 {
  33         return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog);
  34 }
  35
  36 /*
  37  * Allocate an inode on disk.  Mode is used to tell whether the new inode will
  38  * need space, and whether it is a directory.
  39  */
  40 int xfs_dialloc(struct xfs_trans **tpp, xfs_ino_t parent, umode_t mode,
  41                 xfs_ino_t *new_ino);
  42
  43 int xfs_difree(struct xfs_trans *tp, struct xfs_perag *pag,
  44                 xfs_ino_t ino, struct xfs_icluster *ifree);
  45
  46 /*
  47  * Return the location of the inode in imap, for mapping it into a buffer.
  48  */
  49 int
  50 xfs_imap(
  51         struct xfs_perag *pag,
  52         struct xfs_trans *tp,           /* transaction pointer */
  53         xfs_ino_t       ino,            /* inode to locate */
  54         struct xfs_imap *imap,          /* location map structure */
  55         uint            flags);         /* flags for inode btree lookup */
  56
  57 /*
  58  * Log specified fields for the ag hdr (inode section)
  59  */
  60 void
  61 xfs_ialloc_log_agi(
  62         struct xfs_trans *tp,           /* transaction pointer */
  63         struct xfs_buf  *bp,            /* allocation group header buffer */
  64         uint32_t        fields);        /* bitmask of fields to log */
  65
  66 int xfs_read_agi(struct xfs_perag *pag, struct xfs_trans *tp,
  67                 struct xfs_buf **agibpp);
  68 int xfs_ialloc_read_agi(struct xfs_perag *pag, struct xfs_trans *tp,
  69                 struct xfs_buf **agibpp);
  70
  71 /*
  72  * Lookup a record by ino in the btree given by cur.
  73  */
  74 int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
  75                 xfs_lookup_t dir, int *stat);
  76
  77 /*
  78  * Get the data from the pointed-to record.
  79  */
  80 int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
  81                 xfs_inobt_rec_incore_t *rec, int *stat);
  82
  83 /*
  84  * Inode chunk initialisation routine
  85  */
  86 int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp,
  87                           struct list_head *buffer_list, int icount,
  88                           xfs_agnumber_t agno, xfs_agblock_t agbno,
  89                           xfs_agblock_t length, unsigned int gen);
  90
  91
  92 union xfs_btree_rec;
  93 void xfs_inobt_btrec_to_irec(struct xfs_mount *mp,
  94                 const union xfs_btree_rec *rec,
  95                 struct xfs_inobt_rec_incore *irec);
  96 xfs_failaddr_t xfs_inobt_check_irec(struct xfs_btree_cur *cur,
  97                 const struct xfs_inobt_rec_incore *irec);
  98 int xfs_ialloc_has_inodes_at_extent(struct xfs_btree_cur *cur,
  99                 xfs_agblock_t bno, xfs_extlen_t len,
 100                 enum xbtree_recpacking *outcome);
 101 int xfs_ialloc_count_inodes(struct xfs_btree_cur *cur, xfs_agino_t *count,
 102                 xfs_agino_t *freecount);
 103 int xfs_inobt_insert_rec(struct xfs_btree_cur *cur, uint16_t holemask,
 104                 uint8_t count, int32_t freecount, xfs_inofree_t free,
 105                 int *stat);
 106
 107 int xfs_ialloc_cluster_alignment(struct xfs_mount *mp);
 108 void xfs_ialloc_setup_geometry(struct xfs_mount *mp);
 109 xfs_ino_t xfs_ialloc_calc_rootino(struct xfs_mount *mp, int sunit);
 110
 111 int xfs_ialloc_check_shrink(struct xfs_perag *pag, struct xfs_trans *tp,
 112                 struct xfs_buf *agibp, xfs_agblock_t new_length);
 113
 114 #endif  /* __XFS_IALLOC_H__ */