1 /* 2 * Copyright (C) 2017 Oracle. All Rights Reserved. 3 * 4 * Author: Darrick J. Wong <darrick.wong@oracle.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it would be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. 19 */ 20 #include "xfs.h" 21 #include "xfs_fs.h" 22 #include "xfs_shared.h" 23 #include "xfs_format.h" 24 #include "xfs_trans_resv.h" 25 #include "xfs_mount.h" 26 #include "xfs_defer.h" 27 #include "xfs_btree.h" 28 #include "xfs_bit.h" 29 #include "xfs_log_format.h" 30 #include "xfs_trans.h" 31 #include "xfs_sb.h" 32 #include "xfs_alloc.h" 33 #include "xfs_ialloc.h" 34 #include "xfs_rmap.h" 35 #include "scrub/xfs_scrub.h" 36 #include "scrub/scrub.h" 37 #include "scrub/common.h" 38 #include "scrub/btree.h" 39 #include "scrub/trace.h" 40 41 /* 42 * Set us up to scrub reverse mapping btrees. 43 */ 44 int 45 xfs_scrub_setup_ag_rmapbt( 46 struct xfs_scrub_context *sc, 47 struct xfs_inode *ip) 48 { 49 return xfs_scrub_setup_ag_btree(sc, ip, false); 50 } 51 52 /* Reverse-mapping scrubber. */ 53 54 /* Scrub an rmapbt record. */ 55 STATIC int 56 xfs_scrub_rmapbt_rec( 57 struct xfs_scrub_btree *bs, 58 union xfs_btree_rec *rec) 59 { 60 struct xfs_mount *mp = bs->cur->bc_mp; 61 struct xfs_rmap_irec irec; 62 xfs_agnumber_t agno = bs->cur->bc_private.a.agno; 63 bool non_inode; 64 bool is_unwritten; 65 bool is_bmbt; 66 bool is_attr; 67 int error; 68 69 error = xfs_rmap_btrec_to_irec(rec, &irec); 70 if (!xfs_scrub_btree_process_error(bs->sc, bs->cur, 0, &error)) 71 goto out; 72 73 /* Check extent. */ 74 if (irec.rm_startblock + irec.rm_blockcount <= irec.rm_startblock) 75 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 76 77 if (irec.rm_owner == XFS_RMAP_OWN_FS) { 78 /* 79 * xfs_verify_agbno returns false for static fs metadata. 80 * Since that only exists at the start of the AG, validate 81 * that by hand. 82 */ 83 if (irec.rm_startblock != 0 || 84 irec.rm_blockcount != XFS_AGFL_BLOCK(mp) + 1) 85 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 86 } else { 87 /* 88 * Otherwise we must point somewhere past the static metadata 89 * but before the end of the FS. Run the regular check. 90 */ 91 if (!xfs_verify_agbno(mp, agno, irec.rm_startblock) || 92 !xfs_verify_agbno(mp, agno, irec.rm_startblock + 93 irec.rm_blockcount - 1)) 94 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 95 } 96 97 /* Check flags. */ 98 non_inode = XFS_RMAP_NON_INODE_OWNER(irec.rm_owner); 99 is_bmbt = irec.rm_flags & XFS_RMAP_BMBT_BLOCK; 100 is_attr = irec.rm_flags & XFS_RMAP_ATTR_FORK; 101 is_unwritten = irec.rm_flags & XFS_RMAP_UNWRITTEN; 102 103 if (is_bmbt && irec.rm_offset != 0) 104 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 105 106 if (non_inode && irec.rm_offset != 0) 107 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 108 109 if (is_unwritten && (is_bmbt || non_inode || is_attr)) 110 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 111 112 if (non_inode && (is_bmbt || is_unwritten || is_attr)) 113 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 114 115 if (!non_inode) { 116 if (!xfs_verify_ino(mp, irec.rm_owner)) 117 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 118 } else { 119 /* Non-inode owner within the magic values? */ 120 if (irec.rm_owner <= XFS_RMAP_OWN_MIN || 121 irec.rm_owner > XFS_RMAP_OWN_FS) 122 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 123 } 124 out: 125 return error; 126 } 127 128 /* Scrub the rmap btree for some AG. */ 129 int 130 xfs_scrub_rmapbt( 131 struct xfs_scrub_context *sc) 132 { 133 struct xfs_owner_info oinfo; 134 135 xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG); 136 return xfs_scrub_btree(sc, sc->sa.rmap_cur, xfs_scrub_rmapbt_rec, 137 &oinfo, NULL); 138 } 139