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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2017-2023 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_rtbitmap.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
/* Set us up with the realtime metadata locked. */
int
xchk_setup_rtbitmap(
struct xfs_scrub *sc)
{
int error;
error = xchk_trans_alloc(sc, 0);
if (error)
return error;
error = xchk_install_live_inode(sc, sc->mp->m_rbmip);
if (error)
return error;
xchk_ilock(sc, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP);
return 0;
}
/* Realtime bitmap. */
/* Scrub a free extent record from the realtime bitmap. */
STATIC int
xchk_rtbitmap_rec(
struct xfs_mount *mp,
struct xfs_trans *tp,
const struct xfs_rtalloc_rec *rec,
void *priv)
{
struct xfs_scrub *sc = priv;
xfs_rtblock_t startblock;
xfs_filblks_t blockcount;
startblock = rec->ar_startext * mp->m_sb.sb_rextsize;
blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize;
if (!xfs_verify_rtbext(mp, startblock, blockcount))
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
return 0;
}
/* Make sure the entire rtbitmap file is mapped with written extents. */
STATIC int
xchk_rtbitmap_check_extents(
struct xfs_scrub *sc)
{
struct xfs_mount *mp = sc->mp;
struct xfs_bmbt_irec map;
xfs_rtblock_t off;
int nmap;
int error = 0;
for (off = 0; off < mp->m_sb.sb_rbmblocks;) {
if (xchk_should_terminate(sc, &error) ||
(sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
break;
/* Make sure we have a written extent. */
nmap = 1;
error = xfs_bmapi_read(mp->m_rbmip, off,
mp->m_sb.sb_rbmblocks - off, &map, &nmap,
XFS_DATA_FORK);
if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, off, &error))
break;
if (nmap != 1 || !xfs_bmap_is_written_extent(&map)) {
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, off);
break;
}
off += map.br_blockcount;
}
return error;
}
/* Scrub the realtime bitmap. */
int
xchk_rtbitmap(
struct xfs_scrub *sc)
{
int error;
/* Is the size of the rtbitmap correct? */
if (sc->mp->m_rbmip->i_disk_size !=
XFS_FSB_TO_B(sc->mp, sc->mp->m_sb.sb_rbmblocks)) {
xchk_ino_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
return 0;
}
/* Invoke the fork scrubber. */
error = xchk_metadata_inode_forks(sc);
if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
return error;
error = xchk_rtbitmap_check_extents(sc);
if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
return error;
error = xfs_rtalloc_query_all(sc->mp, sc->tp, xchk_rtbitmap_rec, sc);
if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
goto out;
out:
return error;
}
/* xref check that the extent is not free in the rtbitmap */
void
xchk_xref_is_used_rt_space(
struct xfs_scrub *sc,
xfs_rtblock_t fsbno,
xfs_extlen_t len)
{
xfs_rtxnum_t startext;
xfs_rtxnum_t endext;
xfs_rtxlen_t extcount;
bool is_free;
int error;
if (xchk_skip_xref(sc->sm))
return;
startext = fsbno;
endext = fsbno + len - 1;
do_div(startext, sc->mp->m_sb.sb_rextsize);
do_div(endext, sc->mp->m_sb.sb_rextsize);
extcount = endext - startext + 1;
xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
&is_free);
if (!xchk_should_check_xref(sc, &error, NULL))
goto out_unlock;
if (is_free)
xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
out_unlock:
xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
}
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