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_rmap.h" 14 #include "xfs_refcount.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 reverse mapping btrees. 22 */ 23 int 24 xchk_setup_ag_rmapbt( 25 struct xfs_scrub *sc) 26 { 27 return xchk_setup_ag_btree(sc, false); 28 } 29 30 /* Reverse-mapping scrubber. */ 31 32 /* Cross-reference a rmap against the refcount btree. */ 33 STATIC void 34 xchk_rmapbt_xref_refc( 35 struct xfs_scrub *sc, 36 struct xfs_rmap_irec *irec) 37 { 38 xfs_agblock_t fbno; 39 xfs_extlen_t flen; 40 bool non_inode; 41 bool is_bmbt; 42 bool is_attr; 43 bool is_unwritten; 44 int error; 45 46 if (!sc->sa.refc_cur || xchk_skip_xref(sc->sm)) 47 return; 48 49 non_inode = XFS_RMAP_NON_INODE_OWNER(irec->rm_owner); 50 is_bmbt = irec->rm_flags & XFS_RMAP_BMBT_BLOCK; 51 is_attr = irec->rm_flags & XFS_RMAP_ATTR_FORK; 52 is_unwritten = irec->rm_flags & XFS_RMAP_UNWRITTEN; 53 54 /* If this is shared, must be a data fork extent. */ 55 error = xfs_refcount_find_shared(sc->sa.refc_cur, irec->rm_startblock, 56 irec->rm_blockcount, &fbno, &flen, false); 57 if (!xchk_should_check_xref(sc, &error, &sc->sa.refc_cur)) 58 return; 59 if (flen != 0 && (non_inode || is_attr || is_bmbt || is_unwritten)) 60 xchk_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0); 61 } 62 63 /* Cross-reference with the other btrees. */ 64 STATIC void 65 xchk_rmapbt_xref( 66 struct xfs_scrub *sc, 67 struct xfs_rmap_irec *irec) 68 { 69 xfs_agblock_t agbno = irec->rm_startblock; 70 xfs_extlen_t len = irec->rm_blockcount; 71 72 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) 73 return; 74 75 xchk_xref_is_used_space(sc, agbno, len); 76 if (irec->rm_owner == XFS_RMAP_OWN_INODES) 77 xchk_xref_is_inode_chunk(sc, agbno, len); 78 else 79 xchk_xref_is_not_inode_chunk(sc, agbno, len); 80 if (irec->rm_owner == XFS_RMAP_OWN_COW) 81 xchk_xref_is_cow_staging(sc, irec->rm_startblock, 82 irec->rm_blockcount); 83 else 84 xchk_rmapbt_xref_refc(sc, irec); 85 } 86 87 /* Scrub an rmapbt record. */ 88 STATIC int 89 xchk_rmapbt_rec( 90 struct xchk_btree *bs, 91 const union xfs_btree_rec *rec) 92 { 93 struct xfs_mount *mp = bs->cur->bc_mp; 94 struct xfs_rmap_irec irec; 95 xfs_agnumber_t agno = bs->cur->bc_ag.pag->pag_agno; 96 bool non_inode; 97 bool is_unwritten; 98 bool is_bmbt; 99 bool is_attr; 100 int error; 101 102 error = xfs_rmap_btrec_to_irec(rec, &irec); 103 if (!xchk_btree_process_error(bs->sc, bs->cur, 0, &error)) 104 goto out; 105 106 /* Check extent. */ 107 if (irec.rm_startblock + irec.rm_blockcount <= irec.rm_startblock) 108 xchk_btree_set_corrupt(bs->sc, bs->cur, 0); 109 110 if (irec.rm_owner == XFS_RMAP_OWN_FS) { 111 /* 112 * xfs_verify_agbno returns false for static fs metadata. 113 * Since that only exists at the start of the AG, validate 114 * that by hand. 115 */ 116 if (irec.rm_startblock != 0 || 117 irec.rm_blockcount != XFS_AGFL_BLOCK(mp) + 1) 118 xchk_btree_set_corrupt(bs->sc, bs->cur, 0); 119 } else { 120 /* 121 * Otherwise we must point somewhere past the static metadata 122 * but before the end of the FS. Run the regular check. 123 */ 124 if (!xfs_verify_agbno(mp, agno, irec.rm_startblock) || 125 !xfs_verify_agbno(mp, agno, irec.rm_startblock + 126 irec.rm_blockcount - 1)) 127 xchk_btree_set_corrupt(bs->sc, bs->cur, 0); 128 } 129 130 /* Check flags. */ 131 non_inode = XFS_RMAP_NON_INODE_OWNER(irec.rm_owner); 132 is_bmbt = irec.rm_flags & XFS_RMAP_BMBT_BLOCK; 133 is_attr = irec.rm_flags & XFS_RMAP_ATTR_FORK; 134 is_unwritten = irec.rm_flags & XFS_RMAP_UNWRITTEN; 135 136 if (is_bmbt && irec.rm_offset != 0) 137 xchk_btree_set_corrupt(bs->sc, bs->cur, 0); 138 139 if (non_inode && irec.rm_offset != 0) 140 xchk_btree_set_corrupt(bs->sc, bs->cur, 0); 141 142 if (is_unwritten && (is_bmbt || non_inode || is_attr)) 143 xchk_btree_set_corrupt(bs->sc, bs->cur, 0); 144 145 if (non_inode && (is_bmbt || is_unwritten || is_attr)) 146 xchk_btree_set_corrupt(bs->sc, bs->cur, 0); 147 148 if (!non_inode) { 149 if (!xfs_verify_ino(mp, irec.rm_owner)) 150 xchk_btree_set_corrupt(bs->sc, bs->cur, 0); 151 } else { 152 /* Non-inode owner within the magic values? */ 153 if (irec.rm_owner <= XFS_RMAP_OWN_MIN || 154 irec.rm_owner > XFS_RMAP_OWN_FS) 155 xchk_btree_set_corrupt(bs->sc, bs->cur, 0); 156 } 157 158 xchk_rmapbt_xref(bs->sc, &irec); 159 out: 160 return error; 161 } 162 163 /* Scrub the rmap btree for some AG. */ 164 int 165 xchk_rmapbt( 166 struct xfs_scrub *sc) 167 { 168 return xchk_btree(sc, sc->sa.rmap_cur, xchk_rmapbt_rec, 169 &XFS_RMAP_OINFO_AG, NULL); 170 } 171 172 /* xref check that the extent is owned by a given owner */ 173 static inline void 174 xchk_xref_check_owner( 175 struct xfs_scrub *sc, 176 xfs_agblock_t bno, 177 xfs_extlen_t len, 178 const struct xfs_owner_info *oinfo, 179 bool should_have_rmap) 180 { 181 bool has_rmap; 182 int error; 183 184 if (!sc->sa.rmap_cur || xchk_skip_xref(sc->sm)) 185 return; 186 187 error = xfs_rmap_record_exists(sc->sa.rmap_cur, bno, len, oinfo, 188 &has_rmap); 189 if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur)) 190 return; 191 if (has_rmap != should_have_rmap) 192 xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0); 193 } 194 195 /* xref check that the extent is owned by a given owner */ 196 void 197 xchk_xref_is_owned_by( 198 struct xfs_scrub *sc, 199 xfs_agblock_t bno, 200 xfs_extlen_t len, 201 const struct xfs_owner_info *oinfo) 202 { 203 xchk_xref_check_owner(sc, bno, len, oinfo, true); 204 } 205 206 /* xref check that the extent is not owned by a given owner */ 207 void 208 xchk_xref_is_not_owned_by( 209 struct xfs_scrub *sc, 210 xfs_agblock_t bno, 211 xfs_extlen_t len, 212 const struct xfs_owner_info *oinfo) 213 { 214 xchk_xref_check_owner(sc, bno, len, oinfo, false); 215 } 216 217 /* xref check that the extent has no reverse mapping at all */ 218 void 219 xchk_xref_has_no_owner( 220 struct xfs_scrub *sc, 221 xfs_agblock_t bno, 222 xfs_extlen_t len) 223 { 224 bool has_rmap; 225 int error; 226 227 if (!sc->sa.rmap_cur || xchk_skip_xref(sc->sm)) 228 return; 229 230 error = xfs_rmap_has_record(sc->sa.rmap_cur, bno, len, &has_rmap); 231 if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur)) 232 return; 233 if (has_rmap) 234 xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0); 235 } 236