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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#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_btree.h"
#include "xfs_alloc.h"
#include "xfs_rmap.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/btree.h"
#include "xfs_ag.h"
/*
* Set us up to scrub free space btrees.
*/
int
xchk_setup_ag_allocbt(
struct xfs_scrub *sc)
{
return xchk_setup_ag_btree(sc, false);
}
/* Free space btree scrubber. */
/*
* Ensure there's a corresponding cntbt/bnobt record matching this
* bnobt/cntbt record, respectively.
*/
STATIC void
xchk_allocbt_xref_other(
struct xfs_scrub *sc,
xfs_agblock_t agbno,
xfs_extlen_t len)
{
struct xfs_btree_cur **pcur;
xfs_agblock_t fbno;
xfs_extlen_t flen;
int has_otherrec;
int error;
if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
pcur = &sc->sa.cnt_cur;
else
pcur = &sc->sa.bno_cur;
if (!*pcur || xchk_skip_xref(sc->sm))
return;
error = xfs_alloc_lookup_le(*pcur, agbno, len, &has_otherrec);
if (!xchk_should_check_xref(sc, &error, pcur))
return;
if (!has_otherrec) {
xchk_btree_xref_set_corrupt(sc, *pcur, 0);
return;
}
error = xfs_alloc_get_rec(*pcur, &fbno, &flen, &has_otherrec);
if (!xchk_should_check_xref(sc, &error, pcur))
return;
if (!has_otherrec) {
xchk_btree_xref_set_corrupt(sc, *pcur, 0);
return;
}
if (fbno != agbno || flen != len)
xchk_btree_xref_set_corrupt(sc, *pcur, 0);
}
/* Cross-reference with the other btrees. */
STATIC void
xchk_allocbt_xref(
struct xfs_scrub *sc,
xfs_agblock_t agbno,
xfs_extlen_t len)
{
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return;
xchk_allocbt_xref_other(sc, agbno, len);
xchk_xref_is_not_inode_chunk(sc, agbno, len);
xchk_xref_has_no_owner(sc, agbno, len);
xchk_xref_is_not_shared(sc, agbno, len);
}
/* Scrub a bnobt/cntbt record. */
STATIC int
xchk_allocbt_rec(
struct xchk_btree *bs,
const union xfs_btree_rec *rec)
{
struct xfs_perag *pag = bs->cur->bc_ag.pag;
xfs_agblock_t bno;
xfs_extlen_t len;
bno = be32_to_cpu(rec->alloc.ar_startblock);
len = be32_to_cpu(rec->alloc.ar_blockcount);
if (bno + len <= bno ||
!xfs_verify_agbno(pag, bno) ||
!xfs_verify_agbno(pag, bno + len - 1))
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
xchk_allocbt_xref(bs->sc, bno, len);
return 0;
}
/* Scrub the freespace btrees for some AG. */
STATIC int
xchk_allocbt(
struct xfs_scrub *sc,
xfs_btnum_t which)
{
struct xfs_btree_cur *cur;
cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur;
return xchk_btree(sc, cur, xchk_allocbt_rec, &XFS_RMAP_OINFO_AG, NULL);
}
int
xchk_bnobt(
struct xfs_scrub *sc)
{
return xchk_allocbt(sc, XFS_BTNUM_BNO);
}
int
xchk_cntbt(
struct xfs_scrub *sc)
{
return xchk_allocbt(sc, XFS_BTNUM_CNT);
}
/* xref check that the extent is not free */
void
xchk_xref_is_used_space(
struct xfs_scrub *sc,
xfs_agblock_t agbno,
xfs_extlen_t len)
{
bool is_freesp;
int error;
if (!sc->sa.bno_cur || xchk_skip_xref(sc->sm))
return;
error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp);
if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur))
return;
if (is_freesp)
xchk_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0);
}
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