1 /* 2 * Copyright (c) 2000-2003,2005 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_INUM_H__ 19 #define __XFS_INUM_H__ 20 21 /* 22 * Inode number format: 23 * low inopblog bits - offset in block 24 * next agblklog bits - block number in ag 25 * next agno_log bits - ag number 26 * high agno_log-agblklog-inopblog bits - 0 27 */ 28 29 typedef __uint32_t xfs_agino_t; /* within allocation grp inode number */ 30 31 /* 32 * Useful inode bits for this kernel. 33 * Used in some places where having 64-bits in the 32-bit kernels 34 * costs too much. 35 */ 36 #if XFS_BIG_INUMS 37 typedef xfs_ino_t xfs_intino_t; 38 #else 39 typedef __uint32_t xfs_intino_t; 40 #endif 41 42 #define NULLFSINO ((xfs_ino_t)-1) 43 #define NULLAGINO ((xfs_agino_t)-1) 44 45 struct xfs_mount; 46 47 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) 48 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 49 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 50 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 51 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 52 #define XFS_INO_BITS(mp) \ 53 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 54 #define XFS_INO_TO_AGNO(mp,i) \ 55 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 56 #define XFS_INO_TO_AGINO(mp,i) \ 57 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 58 #define XFS_INO_TO_AGBNO(mp,i) \ 59 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 60 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 61 #define XFS_INO_TO_OFFSET(mp,i) \ 62 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 63 #define XFS_INO_TO_FSB(mp,i) \ 64 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 65 #define XFS_AGINO_TO_INO(mp,a,i) \ 66 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 67 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 68 #define XFS_AGINO_TO_OFFSET(mp,i) \ 69 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 70 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 71 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 72 73 #if XFS_BIG_INUMS 74 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 75 #else 76 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 32) - 1ULL)) 77 #endif 78 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 79 80 #endif /* __XFS_INUM_H__ */ 81