fs/xfs/xfs_ialloc.h

   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
  21 struct xfs_buf;
  22 struct xfs_dinode;
  23 struct xfs_imap;
  24 struct xfs_mount;
  25 struct 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  */
  42 #define XFS_MAKE_IPTR(mp,b,o)           xfs_make_iptr(mp,b,o)
  43 static inline struct xfs_dinode *
  44 xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
  45 {
  46         return (xfs_dinode_t *)
  47                 (xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog));
  48 }
  49
  50 /*
  51  * Find a free (set) bit in the inode bitmask.
  52  */
  53 #define XFS_IALLOC_FIND_FREE(fp)        xfs_ialloc_find_free(fp)
  54 static inline int xfs_ialloc_find_free(xfs_inofree_t *fp)
  55 {
  56         return xfs_lowbit64(*fp);
  57 }
  58
  59
  60 /*
  61  * Allocate an inode on disk.
  62  * Mode is used to tell whether the new inode will need space, and whether
  63  * it is a directory.
  64  *
  65  * To work within the constraint of one allocation per transaction,
  66  * xfs_dialloc() is designed to be called twice if it has to do an
  67  * allocation to make more free inodes.  If an inode is
  68  * available without an allocation, agbp would be set to the current
  69  * agbp and alloc_done set to false.
  70  * If an allocation needed to be done, agbp would be set to the
  71  * inode header of the allocation group and alloc_done set to true.
  72  * The caller should then commit the current transaction and allocate a new
  73  * transaction.  xfs_dialloc() should then be called again with
  74  * the agbp value returned from the previous call.
  75  *
  76  * Once we successfully pick an inode its number is returned and the
  77  * on-disk data structures are updated.  The inode itself is not read
  78  * in, since doing so would break ordering constraints with xfs_reclaim.
  79  *
  80  * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
  81  */
  82 int                                     /* error */
  83 xfs_dialloc(
  84         struct xfs_trans *tp,           /* transaction pointer */
  85         xfs_ino_t       parent,         /* parent inode (directory) */
  86         mode_t          mode,           /* mode bits for new inode */
  87         int             okalloc,        /* ok to allocate more space */
  88         struct xfs_buf  **agbp,         /* buf for a.g. inode header */
  89         boolean_t       *alloc_done,    /* an allocation was done to replenish
  90                                            the free inodes */
  91         xfs_ino_t       *inop);         /* inode number allocated */
  92
  93 /*
  94  * Free disk inode.  Carefully avoids touching the incore inode, all
  95  * manipulations incore are the caller's responsibility.
  96  * The on-disk inode is not changed by this operation, only the
  97  * btree (free inode mask) is changed.
  98  */
  99 int                                     /* error */
 100 xfs_difree(
 101         struct xfs_trans *tp,           /* transaction pointer */
 102         xfs_ino_t       inode,          /* inode to be freed */
 103         struct xfs_bmap_free *flist,    /* extents to free */
 104         int             *delete,        /* set if inode cluster was deleted */
 105         xfs_ino_t       *first_ino);    /* first inode in deleted cluster */
 106
 107 /*
 108  * Return the location of the inode in imap, for mapping it into a buffer.
 109  */
 110 int
 111 xfs_imap(
 112         struct xfs_mount *mp,           /* file system mount structure */
 113         struct xfs_trans *tp,           /* transaction pointer */
 114         xfs_ino_t       ino,            /* inode to locate */
 115         struct xfs_imap *imap,          /* location map structure */
 116         uint            flags);         /* flags for inode btree lookup */
 117
 118 /*
 119  * Compute and fill in value of m_in_maxlevels.
 120  */
 121 void
 122 xfs_ialloc_compute_maxlevels(
 123         struct xfs_mount *mp);          /* file system mount structure */
 124
 125 /*
 126  * Log specified fields for the ag hdr (inode section)
 127  */
 128 void
 129 xfs_ialloc_log_agi(
 130         struct xfs_trans *tp,           /* transaction pointer */
 131         struct xfs_buf  *bp,            /* allocation group header buffer */
 132         int             fields);        /* bitmask of fields to log */
 133
 134 /*
 135  * Read in the allocation group header (inode allocation section)
 136  */
 137 int                                     /* error */
 138 xfs_ialloc_read_agi(
 139         struct xfs_mount *mp,           /* file system mount structure */
 140         struct xfs_trans *tp,           /* transaction pointer */
 141         xfs_agnumber_t  agno,           /* allocation group number */
 142         struct xfs_buf  **bpp);         /* allocation group hdr buf */
 143
 144 /*
 145  * Read in the allocation group header to initialise the per-ag data
 146  * in the mount structure
 147  */
 148 int
 149 xfs_ialloc_pagi_init(
 150         struct xfs_mount *mp,           /* file system mount structure */
 151         struct xfs_trans *tp,           /* transaction pointer */
 152         xfs_agnumber_t  agno);          /* allocation group number */
 153
 154 /*
 155  * Lookup the first record greater than or equal to ino
 156  * in the btree given by cur.
 157  */
 158 int xfs_inobt_lookup_ge(struct xfs_btree_cur *cur, xfs_agino_t ino,
 159                 __int32_t fcnt, xfs_inofree_t free, int *stat);
 160
 161 /*
 162  * Lookup the first record less than or equal to ino
 163  * in the btree given by cur.
 164  */
 165 int xfs_inobt_lookup_le(struct xfs_btree_cur *cur, xfs_agino_t ino,
 166                 __int32_t fcnt, xfs_inofree_t free, int *stat);
 167
 168 /*
 169  * Get the data from the pointed-to record.
 170  */
 171 extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur, xfs_agino_t *ino,
 172                              __int32_t *fcnt, xfs_inofree_t *free, int *stat);
 173
 174 #endif  /* __XFS_IALLOC_H__ */