1 files changed, 64 insertions, 0 deletions

diff --git a/fs/xfs/libxfs/xfs_inum.h b/fs/xfs/libxfs/xfs_inum.h
new file mode 100644
index 000000000000..90efdaf1706f
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_inum.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef __XFS_INUM_H__
+#define __XFS_INUM_H__
+
+/*
+ * Inode number format:
+ * low inopblog bits - offset in block
+ * next agblklog bits - block number in ag
+ * next agno_log bits - ag number
+ * high agno_log-agblklog-inopblog bits - 0
+ */
+
+struct xfs_mount;
+
+#define XFS_INO_MASK(k)                 (__uint32_t)((1ULL << (k)) - 1)
+#define XFS_INO_OFFSET_BITS(mp)         (mp)->m_sb.sb_inopblog
+#define XFS_INO_AGBNO_BITS(mp)          (mp)->m_sb.sb_agblklog
+#define XFS_INO_AGINO_BITS(mp)          (mp)->m_agino_log
+#define XFS_INO_AGNO_BITS(mp)           (mp)->m_agno_log
+#define XFS_INO_BITS(mp)                \
+        XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
+#define XFS_INO_TO_AGNO(mp,i)           \
+        ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
+#define XFS_INO_TO_AGINO(mp,i)          \
+        ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
+#define XFS_INO_TO_AGBNO(mp,i)          \
+        (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
+                XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
+#define XFS_INO_TO_OFFSET(mp,i)         \
+        ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
+#define XFS_INO_TO_FSB(mp,i)            \
+        XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
+#define XFS_AGINO_TO_INO(mp,a,i)        \
+        (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
+#define XFS_AGINO_TO_AGBNO(mp,i)        ((i) >> XFS_INO_OFFSET_BITS(mp))
+#define XFS_AGINO_TO_OFFSET(mp,i)       \
+        ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
+#define XFS_OFFBNO_TO_AGINO(mp,b,o)     \
+        ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
+
+#if XFS_BIG_INUMS
+#define XFS_MAXINUMBER          ((xfs_ino_t)((1ULL << 56) - 1ULL))
+#else
+#define XFS_MAXINUMBER          ((xfs_ino_t)((1ULL << 32) - 1ULL))
+#endif
+#define XFS_MAXINUMBER_32       ((xfs_ino_t)((1ULL << 32) - 1ULL))
+
+#endif  /* __XFS_INUM_H__ */