linux/fs/xfs/xfs_ialloc.h
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   1/*
   2 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#ifndef __XFS_IALLOC_H__
  19#define __XFS_IALLOC_H__
  20
  21struct xfs_buf;
  22struct xfs_dinode;
  23struct xfs_imap;
  24struct xfs_mount;
  25struct xfs_trans;
  26
  27/*
  28 * Allocation parameters for inode allocation.
  29 */
  30#define XFS_IALLOC_INODES(mp)   (mp)->m_ialloc_inos
  31#define XFS_IALLOC_BLOCKS(mp)   (mp)->m_ialloc_blks
  32
  33/*
  34 * Move inodes in clusters of this size.
  35 */
  36#define XFS_INODE_BIG_CLUSTER_SIZE      8192
  37#define XFS_INODE_CLUSTER_SIZE(mp)      (mp)->m_inode_cluster_size
  38
  39/*
  40 * Make an inode pointer out of the buffer/offset.
  41 */
  42static inline struct xfs_dinode *
  43xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
  44{
  45        return (xfs_dinode_t *)
  46                (xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog));
  47}
  48
  49/*
  50 * Allocate an inode on disk.
  51 * Mode is used to tell whether the new inode will need space, and whether
  52 * it is a directory.
  53 *
  54 * To work within the constraint of one allocation per transaction,
  55 * xfs_dialloc() is designed to be called twice if it has to do an
  56 * allocation to make more free inodes.  If an inode is
  57 * available without an allocation, agbp would be set to the current
  58 * agbp and alloc_done set to false.
  59 * If an allocation needed to be done, agbp would be set to the
  60 * inode header of the allocation group and alloc_done set to true.
  61 * The caller should then commit the current transaction and allocate a new
  62 * transaction.  xfs_dialloc() should then be called again with
  63 * the agbp value returned from the previous call.
  64 *
  65 * Once we successfully pick an inode its number is returned and the
  66 * on-disk data structures are updated.  The inode itself is not read
  67 * in, since doing so would break ordering constraints with xfs_reclaim.
  68 *
  69 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
  70 */
  71int                                     /* error */
  72xfs_dialloc(
  73        struct xfs_trans *tp,           /* transaction pointer */
  74        xfs_ino_t       parent,         /* parent inode (directory) */
  75        umode_t         mode,           /* mode bits for new inode */
  76        int             okalloc,        /* ok to allocate more space */
  77        struct xfs_buf  **agbp,         /* buf for a.g. inode header */
  78        xfs_ino_t       *inop);         /* inode number allocated */
  79
  80/*
  81 * Free disk inode.  Carefully avoids touching the incore inode, all
  82 * manipulations incore are the caller's responsibility.
  83 * The on-disk inode is not changed by this operation, only the
  84 * btree (free inode mask) is changed.
  85 */
  86int                                     /* error */
  87xfs_difree(
  88        struct xfs_trans *tp,           /* transaction pointer */
  89        xfs_ino_t       inode,          /* inode to be freed */
  90        struct xfs_bmap_free *flist,    /* extents to free */
  91        int             *delete,        /* set if inode cluster was deleted */
  92        xfs_ino_t       *first_ino);    /* first inode in deleted cluster */
  93
  94/*
  95 * Return the location of the inode in imap, for mapping it into a buffer.
  96 */
  97int
  98xfs_imap(
  99        struct xfs_mount *mp,           /* file system mount structure */
 100        struct xfs_trans *tp,           /* transaction pointer */
 101        xfs_ino_t       ino,            /* inode to locate */
 102        struct xfs_imap *imap,          /* location map structure */
 103        uint            flags);         /* flags for inode btree lookup */
 104
 105/*
 106 * Compute and fill in value of m_in_maxlevels.
 107 */
 108void
 109xfs_ialloc_compute_maxlevels(
 110        struct xfs_mount *mp);          /* file system mount structure */
 111
 112/*
 113 * Log specified fields for the ag hdr (inode section)
 114 */
 115void
 116xfs_ialloc_log_agi(
 117        struct xfs_trans *tp,           /* transaction pointer */
 118        struct xfs_buf  *bp,            /* allocation group header buffer */
 119        int             fields);        /* bitmask of fields to log */
 120
 121/*
 122 * Read in the allocation group header (inode allocation section)
 123 */
 124int                                     /* error */
 125xfs_ialloc_read_agi(
 126        struct xfs_mount *mp,           /* file system mount structure */
 127        struct xfs_trans *tp,           /* transaction pointer */
 128        xfs_agnumber_t  agno,           /* allocation group number */
 129        struct xfs_buf  **bpp);         /* allocation group hdr buf */
 130
 131/*
 132 * Read in the allocation group header to initialise the per-ag data
 133 * in the mount structure
 134 */
 135int
 136xfs_ialloc_pagi_init(
 137        struct xfs_mount *mp,           /* file system mount structure */
 138        struct xfs_trans *tp,           /* transaction pointer */
 139        xfs_agnumber_t  agno);          /* allocation group number */
 140
 141/*
 142 * Lookup a record by ino in the btree given by cur.
 143 */
 144int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
 145                xfs_lookup_t dir, int *stat);
 146
 147/*
 148 * Get the data from the pointed-to record.
 149 */
 150int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
 151                xfs_inobt_rec_incore_t *rec, int *stat);
 152
 153extern const struct xfs_buf_ops xfs_agi_buf_ops;
 154
 155#endif  /* __XFS_IALLOC_H__ */
 156
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