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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_rmap.h"
#include "xfs_refcount.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/btree.h"
#include "xfs_ag.h"
/*
* Set us up to scrub reverse mapping btrees.
*/
int
xchk_setup_ag_rmapbt(
struct xfs_scrub *sc)
{
return xchk_setup_ag_btree(sc, false);
}
/* Reverse-mapping scrubber. */
/* Cross-reference a rmap against the refcount btree. */
STATIC void
xchk_rmapbt_xref_refc(
struct xfs_scrub *sc,
struct xfs_rmap_irec *irec)
{
xfs_agblock_t fbno;
xfs_extlen_t flen;
bool non_inode;
bool is_bmbt;
bool is_attr;
bool is_unwritten;
int error;
if (!sc->sa.refc_cur || xchk_skip_xref(sc->sm))
return;
non_inode = XFS_RMAP_NON_INODE_OWNER(irec->rm_owner);
is_bmbt = irec->rm_flags & XFS_RMAP_BMBT_BLOCK;
is_attr = irec->rm_flags & XFS_RMAP_ATTR_FORK;
is_unwritten = irec->rm_flags & XFS_RMAP_UNWRITTEN;
/* If this is shared, must be a data fork extent. */
error = xfs_refcount_find_shared(sc->sa.refc_cur, irec->rm_startblock,
irec->rm_blockcount, &fbno, &flen, false);
if (!xchk_should_check_xref(sc, &error, &sc->sa.refc_cur))
return;
if (flen != 0 && (non_inode || is_attr || is_bmbt || is_unwritten))
xchk_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0);
}
/* Cross-reference with the other btrees. */
STATIC void
xchk_rmapbt_xref(
struct xfs_scrub *sc,
struct xfs_rmap_irec *irec)
{
xfs_agblock_t agbno = irec->rm_startblock;
xfs_extlen_t len = irec->rm_blockcount;
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return;
xchk_xref_is_used_space(sc, agbno, len);
if (irec->rm_owner == XFS_RMAP_OWN_INODES)
xchk_xref_is_inode_chunk(sc, agbno, len);
else
xchk_xref_is_not_inode_chunk(sc, agbno, len);
if (irec->rm_owner == XFS_RMAP_OWN_COW)
xchk_xref_is_cow_staging(sc, irec->rm_startblock,
irec->rm_blockcount);
else
xchk_rmapbt_xref_refc(sc, irec);
}
/* Scrub an rmapbt record. */
STATIC int
xchk_rmapbt_rec(
struct xchk_btree *bs,
const union xfs_btree_rec *rec)
{
struct xfs_mount *mp = bs->cur->bc_mp;
struct xfs_rmap_irec irec;
xfs_agnumber_t agno = bs->cur->bc_ag.pag->pag_agno;
bool non_inode;
bool is_unwritten;
bool is_bmbt;
bool is_attr;
int error;
error = xfs_rmap_btrec_to_irec(rec, &irec);
if (!xchk_btree_process_error(bs->sc, bs->cur, 0, &error))
goto out;
/* Check extent. */
if (irec.rm_startblock + irec.rm_blockcount <= irec.rm_startblock)
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
if (irec.rm_owner == XFS_RMAP_OWN_FS) {
/*
* xfs_verify_agbno returns false for static fs metadata.
* Since that only exists at the start of the AG, validate
* that by hand.
*/
if (irec.rm_startblock != 0 ||
irec.rm_blockcount != XFS_AGFL_BLOCK(mp) + 1)
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
} else {
/*
* Otherwise we must point somewhere past the static metadata
* but before the end of the FS. Run the regular check.
*/
if (!xfs_verify_agbno(mp, agno, irec.rm_startblock) ||
!xfs_verify_agbno(mp, agno, irec.rm_startblock +
irec.rm_blockcount - 1))
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
}
/* Check flags. */
non_inode = XFS_RMAP_NON_INODE_OWNER(irec.rm_owner);
is_bmbt = irec.rm_flags & XFS_RMAP_BMBT_BLOCK;
is_attr = irec.rm_flags & XFS_RMAP_ATTR_FORK;
is_unwritten = irec.rm_flags & XFS_RMAP_UNWRITTEN;
if (is_bmbt && irec.rm_offset != 0)
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
if (non_inode && irec.rm_offset != 0)
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
if (is_unwritten && (is_bmbt || non_inode || is_attr))
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
if (non_inode && (is_bmbt || is_unwritten || is_attr))
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
if (!non_inode) {
if (!xfs_verify_ino(mp, irec.rm_owner))
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
} else {
/* Non-inode owner within the magic values? */
if (irec.rm_owner <= XFS_RMAP_OWN_MIN ||
irec.rm_owner > XFS_RMAP_OWN_FS)
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
}
xchk_rmapbt_xref(bs->sc, &irec);
out:
return error;
}
/* Scrub the rmap btree for some AG. */
int
xchk_rmapbt(
struct xfs_scrub *sc)
{
return xchk_btree(sc, sc->sa.rmap_cur, xchk_rmapbt_rec,
&XFS_RMAP_OINFO_AG, NULL);
}
/* xref check that the extent is owned by a given owner */
static inline void
xchk_xref_check_owner(
struct xfs_scrub *sc,
xfs_agblock_t bno,
xfs_extlen_t len,
const struct xfs_owner_info *oinfo,
bool should_have_rmap)
{
bool has_rmap;
int error;
if (!sc->sa.rmap_cur || xchk_skip_xref(sc->sm))
return;
error = xfs_rmap_record_exists(sc->sa.rmap_cur, bno, len, oinfo,
&has_rmap);
if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
return;
if (has_rmap != should_have_rmap)
xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
}
/* xref check that the extent is owned by a given owner */
void
xchk_xref_is_owned_by(
struct xfs_scrub *sc,
xfs_agblock_t bno,
xfs_extlen_t len,
const struct xfs_owner_info *oinfo)
{
xchk_xref_check_owner(sc, bno, len, oinfo, true);
}
/* xref check that the extent is not owned by a given owner */
void
xchk_xref_is_not_owned_by(
struct xfs_scrub *sc,
xfs_agblock_t bno,
xfs_extlen_t len,
const struct xfs_owner_info *oinfo)
{
xchk_xref_check_owner(sc, bno, len, oinfo, false);
}
/* xref check that the extent has no reverse mapping at all */
void
xchk_xref_has_no_owner(
struct xfs_scrub *sc,
xfs_agblock_t bno,
xfs_extlen_t len)
{
bool has_rmap;
int error;
if (!sc->sa.rmap_cur || xchk_skip_xref(sc->sm))
return;
error = xfs_rmap_has_record(sc->sa.rmap_cur, bno, len, &has_rmap);
if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
return;
if (has_rmap)
xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
}
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