fs/xfs/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 struct xfs_icreate_args;
  37
  38 /*
  39  * Allocate an inode on disk.  Mode is used to tell whether the new inode will
  40  * need space, and whether it is a directory.
  41  */
  42 int xfs_dialloc(struct xfs_trans **tpp, const struct xfs_icreate_args *args,
  43                 xfs_ino_t *new_ino);
  44
  45 int xfs_difree(struct xfs_trans *tp, struct xfs_perag *pag,
  46                 xfs_ino_t ino, struct xfs_icluster *ifree);
  47
  48 /*
  49  * Return the location of the inode in imap, for mapping it into a buffer.
  50  */
  51 int
  52 xfs_imap(
  53         struct xfs_perag *pag,
  54         struct xfs_trans *tp,           /* transaction pointer */
  55         xfs_ino_t       ino,            /* inode to locate */
  56         struct xfs_imap *imap,          /* location map structure */
  57         uint            flags);         /* flags for inode btree lookup */
  58
  59 /*
  60  * Log specified fields for the ag hdr (inode section)
  61  */
  62 void
  63 xfs_ialloc_log_agi(
  64         struct xfs_trans *tp,           /* transaction pointer */
  65         struct xfs_buf  *bp,            /* allocation group header buffer */
  66         uint32_t        fields);        /* bitmask of fields to log */
  67
  68 int xfs_read_agi(struct xfs_perag *pag, struct xfs_trans *tp, xfs_buf_flags_t flags,
  69                 struct xfs_buf **agibpp);
  70 int xfs_ialloc_read_agi(struct xfs_perag *pag, struct xfs_trans *tp,
  71                 int flags, struct xfs_buf **agibpp);
  72 #define XFS_IALLOC_FLAG_TRYLOCK (1U << 0)  /* use trylock for buffer locking */
  73
  74 /*
  75  * Lookup a record by ino in the btree given by cur.
  76  */
  77 int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
  78                 xfs_lookup_t dir, int *stat);
  79
  80 /*
  81  * Get the data from the pointed-to record.
  82  */
  83 int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
  84                 xfs_inobt_rec_incore_t *rec, int *stat);
  85 uint8_t xfs_inobt_rec_freecount(const struct xfs_inobt_rec_incore *irec);
  86
  87 /*
  88  * Inode chunk initialisation routine
  89  */
  90 int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp,
  91                           struct list_head *buffer_list, int icount,
  92                           xfs_agnumber_t agno, xfs_agblock_t agbno,
  93                           xfs_agblock_t length, unsigned int gen);
  94
  95
  96 union xfs_btree_rec;
  97 void xfs_inobt_btrec_to_irec(struct xfs_mount *mp,
  98                 const union xfs_btree_rec *rec,
  99                 struct xfs_inobt_rec_incore *irec);
 100 xfs_failaddr_t xfs_inobt_check_irec(struct xfs_perag *pag,
 101                 const struct xfs_inobt_rec_incore *irec);
 102 int xfs_ialloc_has_inodes_at_extent(struct xfs_btree_cur *cur,
 103                 xfs_agblock_t bno, xfs_extlen_t len,
 104                 enum xbtree_recpacking *outcome);
 105 int xfs_ialloc_count_inodes(struct xfs_btree_cur *cur, xfs_agino_t *count,
 106                 xfs_agino_t *freecount);
 107 int xfs_inobt_insert_rec(struct xfs_btree_cur *cur, uint16_t holemask,
 108                 uint8_t count, int32_t freecount, xfs_inofree_t free,
 109                 int *stat);
 110
 111 int xfs_ialloc_cluster_alignment(struct xfs_mount *mp);
 112 void xfs_ialloc_setup_geometry(struct xfs_mount *mp);
 113 xfs_ino_t xfs_ialloc_calc_rootino(struct xfs_mount *mp, int sunit);
 114
 115 int xfs_ialloc_check_shrink(struct xfs_perag *pag, struct xfs_trans *tp,
 116                 struct xfs_buf *agibp, xfs_agblock_t new_length);
 117
 118 #endif  /* __XFS_IALLOC_H__ */