1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2017 Oracle. All Rights Reserved. 4 * Author: Darrick J. Wong <darrick.wong@oracle.com> 5 */ 6 #include "xfs.h" 7 #include "xfs_fs.h" 8 #include "xfs_shared.h" 9 #include "xfs_format.h" 10 #include "xfs_trans_resv.h" 11 #include "xfs_mount.h" 12 #include "xfs_btree.h" 13 #include "xfs_alloc.h" 14 #include "xfs_rmap.h" 15 #include "scrub/scrub.h" 16 #include "scrub/common.h" 17 #include "scrub/btree.h" 18 #include "xfs_ag.h" 19 20 /* 21 * Set us up to scrub free space btrees. 22 */ 23 int 24 xchk_setup_ag_allocbt( 25 struct xfs_scrub *sc) 26 { 27 return xchk_setup_ag_btree(sc, false); 28 } 29 30 /* Free space btree scrubber. */ 31 /* 32 * Ensure there's a corresponding cntbt/bnobt record matching this 33 * bnobt/cntbt record, respectively. 34 */ 35 STATIC void 36 xchk_allocbt_xref_other( 37 struct xfs_scrub *sc, 38 xfs_agblock_t agbno, 39 xfs_extlen_t len) 40 { 41 struct xfs_btree_cur **pcur; 42 xfs_agblock_t fbno; 43 xfs_extlen_t flen; 44 int has_otherrec; 45 int error; 46 47 if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT) 48 pcur = &sc->sa.cnt_cur; 49 else 50 pcur = &sc->sa.bno_cur; 51 if (!*pcur || xchk_skip_xref(sc->sm)) 52 return; 53 54 error = xfs_alloc_lookup_le(*pcur, agbno, len, &has_otherrec); 55 if (!xchk_should_check_xref(sc, &error, pcur)) 56 return; 57 if (!has_otherrec) { 58 xchk_btree_xref_set_corrupt(sc, *pcur, 0); 59 return; 60 } 61 62 error = xfs_alloc_get_rec(*pcur, &fbno, &flen, &has_otherrec); 63 if (!xchk_should_check_xref(sc, &error, pcur)) 64 return; 65 if (!has_otherrec) { 66 xchk_btree_xref_set_corrupt(sc, *pcur, 0); 67 return; 68 } 69 70 if (fbno != agbno || flen != len) 71 xchk_btree_xref_set_corrupt(sc, *pcur, 0); 72 } 73 74 /* Cross-reference with the other btrees. */ 75 STATIC void 76 xchk_allocbt_xref( 77 struct xfs_scrub *sc, 78 xfs_agblock_t agbno, 79 xfs_extlen_t len) 80 { 81 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) 82 return; 83 84 xchk_allocbt_xref_other(sc, agbno, len); 85 xchk_xref_is_not_inode_chunk(sc, agbno, len); 86 xchk_xref_has_no_owner(sc, agbno, len); 87 xchk_xref_is_not_shared(sc, agbno, len); 88 } 89 90 /* Scrub a bnobt/cntbt record. */ 91 STATIC int 92 xchk_allocbt_rec( 93 struct xchk_btree *bs, 94 union xfs_btree_rec *rec) 95 { 96 struct xfs_mount *mp = bs->cur->bc_mp; 97 xfs_agnumber_t agno = bs->cur->bc_ag.pag->pag_agno; 98 xfs_agblock_t bno; 99 xfs_extlen_t len; 100 101 bno = be32_to_cpu(rec->alloc.ar_startblock); 102 len = be32_to_cpu(rec->alloc.ar_blockcount); 103 104 if (bno + len <= bno || 105 !xfs_verify_agbno(mp, agno, bno) || 106 !xfs_verify_agbno(mp, agno, bno + len - 1)) 107 xchk_btree_set_corrupt(bs->sc, bs->cur, 0); 108 109 xchk_allocbt_xref(bs->sc, bno, len); 110 111 return 0; 112 } 113 114 /* Scrub the freespace btrees for some AG. */ 115 STATIC int 116 xchk_allocbt( 117 struct xfs_scrub *sc, 118 xfs_btnum_t which) 119 { 120 struct xfs_btree_cur *cur; 121 122 cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur; 123 return xchk_btree(sc, cur, xchk_allocbt_rec, &XFS_RMAP_OINFO_AG, NULL); 124 } 125 126 int 127 xchk_bnobt( 128 struct xfs_scrub *sc) 129 { 130 return xchk_allocbt(sc, XFS_BTNUM_BNO); 131 } 132 133 int 134 xchk_cntbt( 135 struct xfs_scrub *sc) 136 { 137 return xchk_allocbt(sc, XFS_BTNUM_CNT); 138 } 139 140 /* xref check that the extent is not free */ 141 void 142 xchk_xref_is_used_space( 143 struct xfs_scrub *sc, 144 xfs_agblock_t agbno, 145 xfs_extlen_t len) 146 { 147 bool is_freesp; 148 int error; 149 150 if (!sc->sa.bno_cur || xchk_skip_xref(sc->sm)) 151 return; 152 153 error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp); 154 if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur)) 155 return; 156 if (is_freesp) 157 xchk_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0); 158 } 159