// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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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_shared.h"
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#include "xfs_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_btree.h"
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#include "xfs_rmap.h"
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#include "xfs_refcount.h"
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#include "scrub/scrub.h"
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#include "scrub/common.h"
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#include "scrub/btree.h"
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/*
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* Set us up to scrub reverse mapping btrees.
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*/
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int
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xchk_setup_ag_rmapbt(
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struct xfs_scrub *sc,
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struct xfs_inode *ip)
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{
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return xchk_setup_ag_btree(sc, ip, false);
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}
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/* Reverse-mapping scrubber. */
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/* Cross-reference a rmap against the refcount btree. */
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STATIC void
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xchk_rmapbt_xref_refc(
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struct xfs_scrub *sc,
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struct xfs_rmap_irec *irec)
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{
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xfs_agblock_t fbno;
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xfs_extlen_t flen;
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bool non_inode;
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bool is_bmbt;
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bool is_attr;
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bool is_unwritten;
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int error;
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if (!sc->sa.refc_cur || xchk_skip_xref(sc->sm))
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return;
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non_inode = XFS_RMAP_NON_INODE_OWNER(irec->rm_owner);
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is_bmbt = irec->rm_flags & XFS_RMAP_BMBT_BLOCK;
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is_attr = irec->rm_flags & XFS_RMAP_ATTR_FORK;
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is_unwritten = irec->rm_flags & XFS_RMAP_UNWRITTEN;
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/* If this is shared, must be a data fork extent. */
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error = xfs_refcount_find_shared(sc->sa.refc_cur, irec->rm_startblock,
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irec->rm_blockcount, &fbno, &flen, false);
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if (!xchk_should_check_xref(sc, &error, &sc->sa.refc_cur))
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return;
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if (flen != 0 && (non_inode || is_attr || is_bmbt || is_unwritten))
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xchk_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0);
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}
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/* Cross-reference with the other btrees. */
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STATIC void
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xchk_rmapbt_xref(
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struct xfs_scrub *sc,
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struct xfs_rmap_irec *irec)
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{
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xfs_agblock_t agbno = irec->rm_startblock;
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xfs_extlen_t len = irec->rm_blockcount;
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if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
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return;
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xchk_xref_is_used_space(sc, agbno, len);
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if (irec->rm_owner == XFS_RMAP_OWN_INODES)
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xchk_xref_is_inode_chunk(sc, agbno, len);
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else
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xchk_xref_is_not_inode_chunk(sc, agbno, len);
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if (irec->rm_owner == XFS_RMAP_OWN_COW)
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xchk_xref_is_cow_staging(sc, irec->rm_startblock,
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irec->rm_blockcount);
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else
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xchk_rmapbt_xref_refc(sc, irec);
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}
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/* Scrub an rmapbt record. */
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STATIC int
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xchk_rmapbt_rec(
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struct xchk_btree *bs,
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union xfs_btree_rec *rec)
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{
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struct xfs_mount *mp = bs->cur->bc_mp;
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struct xfs_rmap_irec irec;
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xfs_agnumber_t agno = bs->cur->bc_ag.agno;
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bool non_inode;
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bool is_unwritten;
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bool is_bmbt;
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bool is_attr;
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int error;
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error = xfs_rmap_btrec_to_irec(rec, &irec);
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if (!xchk_btree_process_error(bs->sc, bs->cur, 0, &error))
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goto out;
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/* Check extent. */
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if (irec.rm_startblock + irec.rm_blockcount <= irec.rm_startblock)
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xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
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if (irec.rm_owner == XFS_RMAP_OWN_FS) {
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/*
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* xfs_verify_agbno returns false for static fs metadata.
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* Since that only exists at the start of the AG, validate
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* that by hand.
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*/
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if (irec.rm_startblock != 0 ||
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irec.rm_blockcount != XFS_AGFL_BLOCK(mp) + 1)
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xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
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} else {
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/*
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* Otherwise we must point somewhere past the static metadata
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* but before the end of the FS. Run the regular check.
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*/
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if (!xfs_verify_agbno(mp, agno, irec.rm_startblock) ||
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!xfs_verify_agbno(mp, agno, irec.rm_startblock +
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irec.rm_blockcount - 1))
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xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
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}
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/* Check flags. */
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non_inode = XFS_RMAP_NON_INODE_OWNER(irec.rm_owner);
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is_bmbt = irec.rm_flags & XFS_RMAP_BMBT_BLOCK;
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is_attr = irec.rm_flags & XFS_RMAP_ATTR_FORK;
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is_unwritten = irec.rm_flags & XFS_RMAP_UNWRITTEN;
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if (is_bmbt && irec.rm_offset != 0)
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xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
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if (non_inode && irec.rm_offset != 0)
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xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
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if (is_unwritten && (is_bmbt || non_inode || is_attr))
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xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
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if (non_inode && (is_bmbt || is_unwritten || is_attr))
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xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
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if (!non_inode) {
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if (!xfs_verify_ino(mp, irec.rm_owner))
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xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
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} else {
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/* Non-inode owner within the magic values? */
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if (irec.rm_owner <= XFS_RMAP_OWN_MIN ||
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irec.rm_owner > XFS_RMAP_OWN_FS)
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xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
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}
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xchk_rmapbt_xref(bs->sc, &irec);
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out:
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return error;
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}
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/* Scrub the rmap btree for some AG. */
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int
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xchk_rmapbt(
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struct xfs_scrub *sc)
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{
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return xchk_btree(sc, sc->sa.rmap_cur, xchk_rmapbt_rec,
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&XFS_RMAP_OINFO_AG, NULL);
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}
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/* xref check that the extent is owned by a given owner */
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static inline void
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xchk_xref_check_owner(
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struct xfs_scrub *sc,
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xfs_agblock_t bno,
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xfs_extlen_t len,
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const struct xfs_owner_info *oinfo,
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bool should_have_rmap)
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{
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bool has_rmap;
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int error;
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if (!sc->sa.rmap_cur || xchk_skip_xref(sc->sm))
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return;
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error = xfs_rmap_record_exists(sc->sa.rmap_cur, bno, len, oinfo,
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&has_rmap);
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if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
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return;
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if (has_rmap != should_have_rmap)
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xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
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}
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/* xref check that the extent is owned by a given owner */
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void
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xchk_xref_is_owned_by(
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struct xfs_scrub *sc,
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xfs_agblock_t bno,
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xfs_extlen_t len,
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const struct xfs_owner_info *oinfo)
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{
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xchk_xref_check_owner(sc, bno, len, oinfo, true);
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}
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/* xref check that the extent is not owned by a given owner */
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void
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xchk_xref_is_not_owned_by(
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struct xfs_scrub *sc,
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xfs_agblock_t bno,
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xfs_extlen_t len,
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const struct xfs_owner_info *oinfo)
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{
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xchk_xref_check_owner(sc, bno, len, oinfo, false);
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}
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/* xref check that the extent has no reverse mapping at all */
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void
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xchk_xref_has_no_owner(
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struct xfs_scrub *sc,
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xfs_agblock_t bno,
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xfs_extlen_t len)
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{
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bool has_rmap;
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int error;
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if (!sc->sa.rmap_cur || xchk_skip_xref(sc->sm))
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return;
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error = xfs_rmap_has_record(sc->sa.rmap_cur, bno, len, &has_rmap);
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if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
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return;
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if (has_rmap)
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xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
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}
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