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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
* Copyright (C) 2017 Oracle.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_shared.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_mount.h"
#include "xfs_ag.h"
#include "xfs_rtbitmap.h"
#include "xfs_rtgroup.h"
/*
* Verify that an AG block number pointer neither points outside the AG
* nor points at static metadata.
*/
static inline bool
xfs_verify_agno_agbno(
struct xfs_mount *mp,
xfs_agnumber_t agno,
xfs_agblock_t agbno)
{
xfs_agblock_t eoag;
eoag = xfs_ag_block_count(mp, agno);
if (agbno >= eoag)
return false;
if (agbno <= XFS_AGFL_BLOCK(mp))
return false;
return true;
}
/*
* Verify that an FS block number pointer neither points outside the
* filesystem nor points at static AG metadata.
*/
inline bool
xfs_verify_fsbno(
struct xfs_mount *mp,
xfs_fsblock_t fsbno)
{
xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, fsbno);
if (agno >= mp->m_sb.sb_agcount)
return false;
return xfs_verify_agno_agbno(mp, agno, XFS_FSB_TO_AGBNO(mp, fsbno));
}
/*
* Verify that a data device extent is fully contained inside the filesystem,
* does not cross an AG boundary, and does not point at static metadata.
*/
bool
xfs_verify_fsbext(
struct xfs_mount *mp,
xfs_fsblock_t fsbno,
xfs_fsblock_t len)
{
if (fsbno + len <= fsbno)
return false;
if (!xfs_verify_fsbno(mp, fsbno))
return false;
if (!xfs_verify_fsbno(mp, fsbno + len - 1))
return false;
return XFS_FSB_TO_AGNO(mp, fsbno) ==
XFS_FSB_TO_AGNO(mp, fsbno + len - 1);
}
/*
* Verify that an AG inode number pointer neither points outside the AG
* nor points at static metadata.
*/
static inline bool
xfs_verify_agno_agino(
struct xfs_mount *mp,
xfs_agnumber_t agno,
xfs_agino_t agino)
{
xfs_agino_t first;
xfs_agino_t last;
xfs_agino_range(mp, agno, &first, &last);
return agino >= first && agino <= last;
}
/*
* Verify that an FS inode number pointer neither points outside the
* filesystem nor points at static AG metadata.
*/
inline bool
xfs_verify_ino(
struct xfs_mount *mp,
xfs_ino_t ino)
{
xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, ino);
xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino);
if (agno >= mp->m_sb.sb_agcount)
return false;
if (XFS_AGINO_TO_INO(mp, agno, agino) != ino)
return false;
return xfs_verify_agno_agino(mp, agno, agino);
}
/* Is this an internal inode number? */
inline bool
xfs_is_sb_inum(
struct xfs_mount *mp,
xfs_ino_t ino)
{
return ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
(xfs_has_quota(mp) &&
xfs_is_quota_inode(&mp->m_sb, ino));
}
/*
* Verify that a directory entry's inode number doesn't point at an internal
* inode, empty space, or static AG metadata.
*/
bool
xfs_verify_dir_ino(
struct xfs_mount *mp,
xfs_ino_t ino)
{
if (xfs_is_sb_inum(mp, ino))
return false;
return xfs_verify_ino(mp, ino);
}
/*
* Verify that a realtime block number pointer neither points outside the
* allocatable areas of the rtgroup nor off the end of the realtime
* device.
*/
inline bool
xfs_verify_rtbno(
struct xfs_mount *mp,
xfs_rtblock_t rtbno)
{
if (xfs_has_rtgroups(mp)) {
xfs_rgnumber_t rgno = xfs_rtb_to_rgno(mp, rtbno);
xfs_rtxnum_t rtx = xfs_rtb_to_rtx(mp, rtbno);
if (rgno >= mp->m_sb.sb_rgcount)
return false;
if (rtx >= xfs_rtgroup_extents(mp, rgno))
return false;
if (xfs_has_rtsb(mp) && rgno == 0 && rtx == 0)
return false;
return true;
}
return rtbno < mp->m_sb.sb_rblocks;
}
/*
* Verify that an allocated realtime device extent neither points outside
* allocatable areas of the rtgroup, across an rtgroup boundary, nor off the
* end of the realtime device.
*/
bool
xfs_verify_rtbext(
struct xfs_mount *mp,
xfs_rtblock_t rtbno,
xfs_filblks_t len)
{
if (rtbno + len <= rtbno)
return false;
if (!xfs_verify_rtbno(mp, rtbno))
return false;
if (!xfs_verify_rtbno(mp, rtbno + len - 1))
return false;
if (xfs_has_rtgroups(mp) &&
xfs_rtb_to_rgno(mp, rtbno) != xfs_rtb_to_rgno(mp, rtbno + len - 1))
return false;
return true;
}
/* Calculate the range of valid icount values. */
inline void
xfs_icount_range(
struct xfs_mount *mp,
unsigned long long *min,
unsigned long long *max)
{
unsigned long long nr_inos = 0;
struct xfs_perag *pag = NULL;
/* root, rtbitmap, rtsum all live in the first chunk */
*min = XFS_INODES_PER_CHUNK;
while ((pag = xfs_perag_next(mp, pag)))
nr_inos += pag->agino_max - pag->agino_min + 1;
*max = nr_inos;
}
/* Sanity-checking of inode counts. */
bool
xfs_verify_icount(
struct xfs_mount *mp,
unsigned long long icount)
{
unsigned long long min, max;
xfs_icount_range(mp, &min, &max);
return icount >= min && icount <= max;
}
/* Sanity-checking of dir/attr block offsets. */
bool
xfs_verify_dablk(
struct xfs_mount *mp,
xfs_fileoff_t dabno)
{
xfs_dablk_t max_dablk = -1U;
return dabno <= max_dablk;
}
/* Check that a file block offset does not exceed the maximum. */
bool
xfs_verify_fileoff(
struct xfs_mount *mp,
xfs_fileoff_t off)
{
return off <= XFS_MAX_FILEOFF;
}
/* Check that a range of file block offsets do not exceed the maximum. */
bool
xfs_verify_fileext(
struct xfs_mount *mp,
xfs_fileoff_t off,
xfs_fileoff_t len)
{
if (off + len <= off)
return false;
if (!xfs_verify_fileoff(mp, off))
return false;
return xfs_verify_fileoff(mp, off + len - 1);
}
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