| // 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" |
| |
| /* |
| * 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, |
| 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.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); |
| } |