fs/xfs/xfs_ialloc_btree.h

   1 /*
   2  * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_IALLOC_BTREE_H__
  33 #define __XFS_IALLOC_BTREE_H__
  34
  35 /*
  36  * Inode map on-disk structures
  37  */
  38
  39 struct xfs_buf;
  40 struct xfs_btree_cur;
  41 struct xfs_btree_sblock;
  42 struct xfs_mount;
  43
  44 /*
  45  * There is a btree for the inode map per allocation group.
  46  */
  47 #define XFS_IBT_MAGIC   0x49414254      /* 'IABT' */
  48
  49 typedef __uint64_t      xfs_inofree_t;
  50 #define XFS_INODES_PER_CHUNK    (NBBY * sizeof(xfs_inofree_t))
  51 #define XFS_INODES_PER_CHUNK_LOG        (XFS_NBBYLOG + 3)
  52 #define XFS_INOBT_ALL_FREE      ((xfs_inofree_t)-1)
  53
  54 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_MASKN)
  55 xfs_inofree_t xfs_inobt_maskn(int i, int n);
  56 #define XFS_INOBT_MASKN(i,n)            xfs_inobt_maskn(i,n)
  57 #else
  58 #define XFS_INOBT_MASKN(i,n)    \
  59         ((((n) >= XFS_INODES_PER_CHUNK ? \
  60                 (xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i))
  61 #endif
  62
  63 /*
  64  * Data record structure
  65  */
  66 typedef struct xfs_inobt_rec
  67 {
  68         xfs_agino_t     ir_startino;    /* starting inode number */
  69         __int32_t       ir_freecount;   /* count of free inodes (set bits) */
  70         xfs_inofree_t   ir_free;        /* free inode mask */
  71 } xfs_inobt_rec_t;
  72
  73 /*
  74  * Key structure
  75  */
  76 typedef struct xfs_inobt_key
  77 {
  78         xfs_agino_t     ir_startino;    /* starting inode number */
  79 } xfs_inobt_key_t;
  80
  81 typedef xfs_agblock_t xfs_inobt_ptr_t;  /* btree pointer type */
  82                                         /* btree block header type */
  83 typedef struct xfs_btree_sblock xfs_inobt_block_t;
  84
  85 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_INOBT_BLOCK)
  86 xfs_inobt_block_t *xfs_buf_to_inobt_block(struct xfs_buf *bp);
  87 #define XFS_BUF_TO_INOBT_BLOCK(bp)      xfs_buf_to_inobt_block(bp)
  88 #else
  89 #define XFS_BUF_TO_INOBT_BLOCK(bp) ((xfs_inobt_block_t *)(XFS_BUF_PTR(bp)))
  90 #endif
  91
  92 /*
  93  * Bit manipulations for ir_free.
  94  */
  95 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_MASK)
  96 xfs_inofree_t xfs_inobt_mask(int i);
  97 #define XFS_INOBT_MASK(i)               xfs_inobt_mask(i)
  98 #else
  99 #define XFS_INOBT_MASK(i)               ((xfs_inofree_t)1 << (i))
 100 #endif
 101 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_IS_FREE)
 102 int xfs_inobt_is_free(xfs_inobt_rec_t *rp, int i);
 103 #define XFS_INOBT_IS_FREE(rp,i)         xfs_inobt_is_free(rp,i)
 104 #define XFS_INOBT_IS_FREE_DISK(rp,i)    xfs_inobt_is_free_disk(rp,i)
 105 #else
 106 #define XFS_INOBT_IS_FREE(rp,i) \
 107         (((rp)->ir_free & XFS_INOBT_MASK(i)) != 0)
 108 #define XFS_INOBT_IS_FREE_DISK(rp,i) \
 109         ((INT_GET((rp)->ir_free, ARCH_CONVERT) & XFS_INOBT_MASK(i)) != 0)
 110 #endif
 111 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_SET_FREE)
 112 void xfs_inobt_set_free(xfs_inobt_rec_t *rp, int i);
 113 #define XFS_INOBT_SET_FREE(rp,i)        xfs_inobt_set_free(rp,i)
 114 #else
 115 #define XFS_INOBT_SET_FREE(rp,i)        ((rp)->ir_free |= XFS_INOBT_MASK(i))
 116 #endif
 117 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_CLR_FREE)
 118 void xfs_inobt_clr_free(xfs_inobt_rec_t *rp, int i);
 119 #define XFS_INOBT_CLR_FREE(rp,i)        xfs_inobt_clr_free(rp,i)
 120 #else
 121 #define XFS_INOBT_CLR_FREE(rp,i)        ((rp)->ir_free &= ~XFS_INOBT_MASK(i))
 122 #endif
 123
 124 /*
 125  * Real block structures have a size equal to the disk block size.
 126  */
 127 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_BLOCK_SIZE)
 128 int xfs_inobt_block_size(int lev, struct xfs_btree_cur *cur);
 129 #define XFS_INOBT_BLOCK_SIZE(lev,cur)   xfs_inobt_block_size(lev,cur)
 130 #else
 131 #define XFS_INOBT_BLOCK_SIZE(lev,cur)   (1 << (cur)->bc_blocklog)
 132 #endif
 133
 134 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_BLOCK_MAXRECS)
 135 int xfs_inobt_block_maxrecs(int lev, struct xfs_btree_cur *cur);
 136 #define XFS_INOBT_BLOCK_MAXRECS(lev,cur)        xfs_inobt_block_maxrecs(lev,cur)
 137 #else
 138 #define XFS_INOBT_BLOCK_MAXRECS(lev,cur)        \
 139         ((cur)->bc_mp->m_inobt_mxr[lev != 0])
 140 #endif
 141 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_BLOCK_MINRECS)
 142 int xfs_inobt_block_minrecs(int lev, struct xfs_btree_cur *cur);
 143 #define XFS_INOBT_BLOCK_MINRECS(lev,cur)        xfs_inobt_block_minrecs(lev,cur)
 144 #else
 145 #define XFS_INOBT_BLOCK_MINRECS(lev,cur)        \
 146         ((cur)->bc_mp->m_inobt_mnr[lev != 0])
 147 #endif
 148
 149 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_IS_LAST_REC)
 150 int xfs_inobt_is_last_rec(struct xfs_btree_cur *cur);
 151 #define XFS_INOBT_IS_LAST_REC(cur)      xfs_inobt_is_last_rec(cur)
 152 #else
 153 #define XFS_INOBT_IS_LAST_REC(cur)      \
 154         ((cur)->bc_ptrs[0] == \
 155                 INT_GET(XFS_BUF_TO_INOBT_BLOCK((cur)->bc_bufs[0])->bb_numrecs, ARCH_CONVERT))
 156 #endif
 157
 158 /*
 159  * Maximum number of inode btree levels.
 160  */
 161 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IN_MAXLEVELS)
 162 int xfs_in_maxlevels(struct xfs_mount *mp);
 163 #define XFS_IN_MAXLEVELS(mp)            xfs_in_maxlevels(mp)
 164 #else
 165 #define XFS_IN_MAXLEVELS(mp)            ((mp)->m_in_maxlevels)
 166 #endif
 167
 168 /*
 169  * block numbers in the AG.
 170  */
 171 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IBT_BLOCK)
 172 xfs_agblock_t xfs_ibt_block(struct xfs_mount *mp);
 173 #define XFS_IBT_BLOCK(mp)               xfs_ibt_block(mp)
 174 #else
 175 #define XFS_IBT_BLOCK(mp)       ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
 176 #endif
 177 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_PREALLOC_BLOCKS)
 178 xfs_agblock_t xfs_prealloc_blocks(struct xfs_mount *mp);
 179 #define XFS_PREALLOC_BLOCKS(mp)         xfs_prealloc_blocks(mp)
 180 #else
 181 #define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
 182 #endif
 183
 184 /*
 185  * Record, key, and pointer address macros for btree blocks.
 186  */
 187 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_REC_ADDR)
 188 xfs_inobt_rec_t *
 189 xfs_inobt_rec_addr(xfs_inobt_block_t *bb, int i, struct xfs_btree_cur *cur);
 190 #define XFS_INOBT_REC_ADDR(bb,i,cur)    xfs_inobt_rec_addr(bb,i,cur)
 191 #else
 192 #define XFS_INOBT_REC_ADDR(bb,i,cur)    \
 193         XFS_BTREE_REC_ADDR(XFS_INOBT_BLOCK_SIZE(0,cur), xfs_inobt, bb, i, \
 194                 XFS_INOBT_BLOCK_MAXRECS(0, cur))
 195 #endif
 196
 197 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_KEY_ADDR)
 198 xfs_inobt_key_t *
 199 xfs_inobt_key_addr(xfs_inobt_block_t *bb, int i, struct xfs_btree_cur *cur);
 200 #define XFS_INOBT_KEY_ADDR(bb,i,cur)    xfs_inobt_key_addr(bb,i,cur)
 201 #else
 202 #define XFS_INOBT_KEY_ADDR(bb,i,cur)    \
 203         XFS_BTREE_KEY_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, i, \
 204                 XFS_INOBT_BLOCK_MAXRECS(1, cur))
 205 #endif
 206
 207 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INOBT_PTR_ADDR)
 208 xfs_inobt_ptr_t *
 209 xfs_inobt_ptr_addr(xfs_inobt_block_t *bb, int i, struct xfs_btree_cur *cur);
 210 #define XFS_INOBT_PTR_ADDR(bb,i,cur)    xfs_inobt_ptr_addr(bb,i,cur)
 211 #else
 212 #define XFS_INOBT_PTR_ADDR(bb,i,cur)    \
 213         XFS_BTREE_PTR_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, i, \
 214                 XFS_INOBT_BLOCK_MAXRECS(1, cur))
 215 #endif
 216
 217 /*
 218  * Prototypes for externally visible routines.
 219  */
 220
 221 /*
 222  * Decrement cursor by one record at the level.
 223  * For nonzero levels the leaf-ward information is untouched.
 224  */
 225 int                                     /* error */
 226 xfs_inobt_decrement(
 227         struct xfs_btree_cur    *cur,   /* btree cursor */
 228         int                     level,  /* level in btree, 0 is leaf */
 229         int                     *stat); /* success/failure */
 230
 231 /*
 232  * Delete the record pointed to by cur.
 233  * The cursor refers to the place where the record was (could be inserted)
 234  * when the operation returns.
 235  */
 236 int                                     /* error */
 237 xfs_inobt_delete(
 238         struct xfs_btree_cur    *cur,   /* btree cursor */
 239         int                     *stat); /* success/failure */
 240
 241 /*
 242  * Get the data from the pointed-to record.
 243  */
 244 int                                     /* error */
 245 xfs_inobt_get_rec(
 246         struct xfs_btree_cur    *cur,   /* btree cursor */
 247         xfs_agino_t             *ino,   /* output: starting inode of chunk */
 248         __int32_t               *fcnt,  /* output: number of free inodes */
 249         xfs_inofree_t           *free,  /* output: free inode mask */
 250         int                     *stat); /* output: success/failure */
 251
 252 /*
 253  * Increment cursor by one record at the level.
 254  * For nonzero levels the leaf-ward information is untouched.
 255  */
 256 int                                     /* error */
 257 xfs_inobt_increment(
 258         struct xfs_btree_cur    *cur,   /* btree cursor */
 259         int                     level,  /* level in btree, 0 is leaf */
 260         int                     *stat); /* success/failure */
 261
 262 /*
 263  * Insert the current record at the point referenced by cur.
 264  * The cursor may be inconsistent on return if splits have been done.
 265  */
 266 int                                     /* error */
 267 xfs_inobt_insert(
 268         struct xfs_btree_cur    *cur,   /* btree cursor */
 269         int                     *stat); /* success/failure */
 270
 271 /*
 272  * Lookup the record equal to ino in the btree given by cur.
 273  */
 274 int                                     /* error */
 275 xfs_inobt_lookup_eq(
 276         struct xfs_btree_cur    *cur,   /* btree cursor */
 277         xfs_agino_t             ino,    /* starting inode of chunk */
 278         __int32_t               fcnt,   /* free inode count */
 279         xfs_inofree_t           free,   /* free inode mask */
 280         int                     *stat); /* success/failure */
 281
 282 /*
 283  * Lookup the first record greater than or equal to ino
 284  * in the btree given by cur.
 285  */
 286 int                                     /* error */
 287 xfs_inobt_lookup_ge(
 288         struct xfs_btree_cur    *cur,   /* btree cursor */
 289         xfs_agino_t             ino,    /* starting inode of chunk */
 290         __int32_t               fcnt,   /* free inode count */
 291         xfs_inofree_t           free,   /* free inode mask */
 292         int                     *stat); /* success/failure */
 293
 294 /*
 295  * Lookup the first record less than or equal to ino
 296  * in the btree given by cur.
 297  */
 298 int                                     /* error */
 299 xfs_inobt_lookup_le(
 300         struct xfs_btree_cur    *cur,   /* btree cursor */
 301         xfs_agino_t             ino,    /* starting inode of chunk */
 302         __int32_t               fcnt,   /* free inode count */
 303         xfs_inofree_t           free,   /* free inode mask */
 304         int                     *stat); /* success/failure */
 305
 306 /*
 307  * Update the record referred to by cur, to the value given
 308  * by [ino, fcnt, free].
 309  * This either works (return 0) or gets an EFSCORRUPTED error.
 310  */
 311 int                                     /* error */
 312 xfs_inobt_update(
 313         struct xfs_btree_cur    *cur,   /* btree cursor */
 314         xfs_agino_t             ino,    /* starting inode of chunk */
 315         __int32_t               fcnt,   /* free inode count */
 316         xfs_inofree_t           free);  /* free inode mask */
 317
 318 #endif  /* __XFS_IALLOC_BTREE_H__ */