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
  16 /* Move inodes in clusters of this size */
  17 #define XFS_INODE_BIG_CLUSTER_SIZE      8192
  18
  19 struct xfs_icluster {
  20         bool            deleted;        /* record is deleted */
  21         xfs_ino_t       first_ino;      /* first inode number */
  22         uint64_t        alloc;          /* inode phys. allocation bitmap for
  23                                          * sparse chunks */
  24 };
  25
  26 /*
  27  * Make an inode pointer out of the buffer/offset.
  28  */
  29 static inline struct xfs_dinode *
  30 xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
  31 {
  32         return xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog);
  33 }
  34
  35 /*
  36  * Allocate an inode on disk.  Mode is used to tell whether the new inode will
  37  * need space, and whether it is a directory.
  38  */
  39 int xfs_dialloc(struct xfs_trans **tpp, xfs_ino_t parent, umode_t mode,
  40                 xfs_ino_t *new_ino);
  41
  42 /*
  43  * Free disk inode.  Carefully avoids touching the incore inode, all
  44  * manipulations incore are the caller's responsibility.
  45  * The on-disk inode is not changed by this operation, only the
  46  * btree (free inode mask) is changed.
  47  */
  48 int                                     /* error */
  49 xfs_difree(
  50         struct xfs_trans *tp,           /* transaction pointer */
  51         xfs_ino_t       inode,          /* inode to be freed */
  52         struct xfs_icluster *ifree);    /* cluster info if deleted */
  53
  54 /*
  55  * Return the location of the inode in imap, for mapping it into a buffer.
  56  */
  57 int
  58 xfs_imap(
  59         struct xfs_mount *mp,           /* file system mount structure */
  60         struct xfs_trans *tp,           /* transaction pointer */
  61         xfs_ino_t       ino,            /* inode to locate */
  62         struct xfs_imap *imap,          /* location map structure */
  63         uint            flags);         /* flags for inode btree lookup */
  64
  65 /*
  66  * Log specified fields for the ag hdr (inode section)
  67  */
  68 void
  69 xfs_ialloc_log_agi(
  70         struct xfs_trans *tp,           /* transaction pointer */
  71         struct xfs_buf  *bp,            /* allocation group header buffer */
  72         int             fields);        /* bitmask of fields to log */
  73
  74 /*
  75  * Read in the allocation group header (inode allocation section)
  76  */
  77 int                                     /* error */
  78 xfs_ialloc_read_agi(
  79         struct xfs_mount *mp,           /* file system mount structure */
  80         struct xfs_trans *tp,           /* transaction pointer */
  81         xfs_agnumber_t  agno,           /* allocation group number */
  82         struct xfs_buf  **bpp);         /* allocation group hdr buf */
  83
  84 /*
  85  * Read in the allocation group header to initialise the per-ag data
  86  * in the mount structure
  87  */
  88 int
  89 xfs_ialloc_pagi_init(
  90         struct xfs_mount *mp,           /* file system mount structure */
  91         struct xfs_trans *tp,           /* transaction pointer */
  92         xfs_agnumber_t  agno);          /* allocation group number */
  93
  94 /*
  95  * Lookup a record by ino in the btree given by cur.
  96  */
  97 int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
  98                 xfs_lookup_t dir, int *stat);
  99
 100 /*
 101  * Get the data from the pointed-to record.
 102  */
 103 int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
 104                 xfs_inobt_rec_incore_t *rec, int *stat);
 105
 106 /*
 107  * Inode chunk initialisation routine
 108  */
 109 int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp,
 110                           struct list_head *buffer_list, int icount,
 111                           xfs_agnumber_t agno, xfs_agblock_t agbno,
 112                           xfs_agblock_t length, unsigned int gen);
 113
 114 int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp,
 115                 xfs_agnumber_t agno, struct xfs_buf **bpp);
 116
 117 union xfs_btree_rec;
 118 void xfs_inobt_btrec_to_irec(struct xfs_mount *mp, union xfs_btree_rec *rec,
 119                 struct xfs_inobt_rec_incore *irec);
 120 int xfs_ialloc_has_inodes_at_extent(struct xfs_btree_cur *cur,
 121                 xfs_agblock_t bno, xfs_extlen_t len, bool *exists);
 122 int xfs_ialloc_has_inode_record(struct xfs_btree_cur *cur, xfs_agino_t low,
 123                 xfs_agino_t high, bool *exists);
 124 int xfs_ialloc_count_inodes(struct xfs_btree_cur *cur, xfs_agino_t *count,
 125                 xfs_agino_t *freecount);
 126 int xfs_inobt_insert_rec(struct xfs_btree_cur *cur, uint16_t holemask,
 127                 uint8_t count, int32_t freecount, xfs_inofree_t free,
 128                 int *stat);
 129
 130 int xfs_ialloc_cluster_alignment(struct xfs_mount *mp);
 131 void xfs_ialloc_setup_geometry(struct xfs_mount *mp);
 132 xfs_ino_t xfs_ialloc_calc_rootino(struct xfs_mount *mp, int sunit);
 133
 134 #endif  /* __XFS_IALLOC_H__ */