// 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_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_mount.h"
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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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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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* 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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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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* 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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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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/* 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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eoag = xfs_ag_block_count(mp, agno);
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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, M_IGEO(mp)->cluster_align);
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*first = XFS_AGB_TO_AGINO(mp, bno);
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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, M_IGEO(mp)->cluster_align);
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*last = XFS_AGB_TO_AGINO(mp, bno) - 1;
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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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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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* Verify that an AG inode number pointer neither points outside the AG
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* nor points at static metadata, or is NULLAGINO.
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*/
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bool
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xfs_verify_agino_or_null(
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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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return agino == NULLAGINO || xfs_verify_agino(mp, agno, agino);
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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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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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/* 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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* 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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* 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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/* Calculate the range of valid icount values. */
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void
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xfs_icount_range(
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struct xfs_mount *mp,
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unsigned long long *min,
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unsigned long long *max)
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{
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unsigned long long nr_inos = 0;
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xfs_agnumber_t agno;
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/* root, rtbitmap, rtsum all live in the first chunk */
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*min = XFS_INODES_PER_CHUNK;
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for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
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xfs_agino_t first, last;
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xfs_agino_range(mp, agno, &first, &last);
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nr_inos += last - first + 1;
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}
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*max = nr_inos;
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}
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/* Sanity-checking of inode counts. */
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bool
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xfs_verify_icount(
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struct xfs_mount *mp,
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unsigned long long icount)
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{
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unsigned long long min, max;
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xfs_icount_range(mp, &min, &max);
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return icount >= min && icount <= max;
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}
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/* Sanity-checking of dir/attr block offsets. */
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bool
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xfs_verify_dablk(
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struct xfs_mount *mp,
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xfs_fileoff_t dabno)
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{
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xfs_dablk_t max_dablk = -1U;
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return dabno <= max_dablk;
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}
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