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@@ -0,0 +1,173 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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+ * Copyright (C) 2017 Oracle.
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+ * All Rights Reserved.
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+ */
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+#include "xfs.h"
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+#include "xfs_fs.h"
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+#include "xfs_format.h"
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+#include "xfs_log_format.h"
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+#include "xfs_shared.h"
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+#include "xfs_trans_resv.h"
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+#include "xfs_bit.h"
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+#include "xfs_sb.h"
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+#include "xfs_mount.h"
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+#include "xfs_defer.h"
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+#include "xfs_inode.h"
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+#include "xfs_btree.h"
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+#include "xfs_rmap.h"
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+#include "xfs_alloc_btree.h"
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+#include "xfs_alloc.h"
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+#include "xfs_ialloc.h"
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+
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+/* Find the size of the AG, in blocks. */
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+xfs_agblock_t
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+xfs_ag_block_count(
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+ struct xfs_mount *mp,
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+ xfs_agnumber_t agno)
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+{
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+ ASSERT(agno < mp->m_sb.sb_agcount);
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+
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+ if (agno < mp->m_sb.sb_agcount - 1)
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+ return mp->m_sb.sb_agblocks;
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+ return mp->m_sb.sb_dblocks - (agno * mp->m_sb.sb_agblocks);
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+}
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+
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+/*
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+ * Verify that an AG block number pointer neither points outside the AG
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+ * nor points at static metadata.
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+ */
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+bool
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+xfs_verify_agbno(
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+ struct xfs_mount *mp,
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+ xfs_agnumber_t agno,
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+ xfs_agblock_t agbno)
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+{
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+ xfs_agblock_t eoag;
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+
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+ eoag = xfs_ag_block_count(mp, agno);
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+ if (agbno >= eoag)
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+ return false;
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+ if (agbno <= XFS_AGFL_BLOCK(mp))
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+ return false;
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+ return true;
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+}
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+
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+/*
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+ * Verify that an FS block number pointer neither points outside the
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+ * filesystem nor points at static AG metadata.
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+ */
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+bool
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+xfs_verify_fsbno(
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+ struct xfs_mount *mp,
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+ xfs_fsblock_t fsbno)
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+{
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+ xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, fsbno);
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+
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+ if (agno >= mp->m_sb.sb_agcount)
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+ return false;
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+ return xfs_verify_agbno(mp, agno, XFS_FSB_TO_AGBNO(mp, fsbno));
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+}
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+
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+/* Calculate the first and last possible inode number in an AG. */
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+void
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+xfs_agino_range(
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+ struct xfs_mount *mp,
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+ xfs_agnumber_t agno,
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+ xfs_agino_t *first,
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+ xfs_agino_t *last)
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+{
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+ xfs_agblock_t bno;
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+ xfs_agblock_t eoag;
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+
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+ eoag = xfs_ag_block_count(mp, agno);
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+
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+ /*
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+ * Calculate the first inode, which will be in the first
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+ * cluster-aligned block after the AGFL.
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+ */
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+ bno = round_up(XFS_AGFL_BLOCK(mp) + 1,
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+ xfs_ialloc_cluster_alignment(mp));
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+ *first = XFS_OFFBNO_TO_AGINO(mp, bno, 0);
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+
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+ /*
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+ * Calculate the last inode, which will be at the end of the
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+ * last (aligned) cluster that can be allocated in the AG.
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+ */
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+ bno = round_down(eoag, xfs_ialloc_cluster_alignment(mp));
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+ *last = XFS_OFFBNO_TO_AGINO(mp, bno, 0) - 1;
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+}
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+
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+/*
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+ * Verify that an AG inode number pointer neither points outside the AG
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+ * nor points at static metadata.
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+ */
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+bool
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+xfs_verify_agino(
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+ struct xfs_mount *mp,
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+ xfs_agnumber_t agno,
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+ xfs_agino_t agino)
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+{
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+ xfs_agino_t first;
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+ xfs_agino_t last;
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+
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+ xfs_agino_range(mp, agno, &first, &last);
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+ return agino >= first && agino <= last;
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+}
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+
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+/*
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+ * Verify that an FS inode number pointer neither points outside the
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+ * filesystem nor points at static AG metadata.
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+ */
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+bool
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+xfs_verify_ino(
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+ struct xfs_mount *mp,
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+ xfs_ino_t ino)
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+{
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+ xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, ino);
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+ xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino);
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+
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+ if (agno >= mp->m_sb.sb_agcount)
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+ return false;
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+ if (XFS_AGINO_TO_INO(mp, agno, agino) != ino)
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+ return false;
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+ return xfs_verify_agino(mp, agno, agino);
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+}
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+
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+/* Is this an internal inode number? */
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+bool
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+xfs_internal_inum(
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+ struct xfs_mount *mp,
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+ xfs_ino_t ino)
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+{
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+ return ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
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+ (xfs_sb_version_hasquota(&mp->m_sb) &&
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+ xfs_is_quota_inode(&mp->m_sb, ino));
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+}
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+
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+/*
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+ * Verify that a directory entry's inode number doesn't point at an internal
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+ * inode, empty space, or static AG metadata.
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+ */
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+bool
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+xfs_verify_dir_ino(
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+ struct xfs_mount *mp,
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+ xfs_ino_t ino)
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+{
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+ if (xfs_internal_inum(mp, ino))
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+ return false;
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+ return xfs_verify_ino(mp, ino);
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+}
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+
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+/*
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+ * Verify that an realtime block number pointer doesn't point off the
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+ * end of the realtime device.
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+ */
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+bool
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+xfs_verify_rtbno(
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+ struct xfs_mount *mp,
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+ xfs_rtblock_t rtbno)
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+{
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+ return rtbno < mp->m_sb.sb_rblocks;
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+}
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Dave Chinner