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_rmap.h" 34 #include "scrub/xfs_scrub.h" 35 #include "scrub/scrub.h" 36 #include "scrub/common.h" 37 #include "scrub/btree.h" 38 #include "scrub/trace.h" 39 40 /* 41 * Set us up to scrub reference count btrees. 42 */ 43 int 44 xfs_scrub_setup_ag_refcountbt( 45 struct xfs_scrub_context *sc, 46 struct xfs_inode *ip) 47 { 48 return xfs_scrub_setup_ag_btree(sc, ip, false); 49 } 50 51 /* Reference count btree scrubber. */ 52 53 /* Scrub a refcountbt record. */ 54 STATIC int 55 xfs_scrub_refcountbt_rec( 56 struct xfs_scrub_btree *bs, 57 union xfs_btree_rec *rec) 58 { 59 struct xfs_mount *mp = bs->cur->bc_mp; 60 xfs_agnumber_t agno = bs->cur->bc_private.a.agno; 61 xfs_agblock_t bno; 62 xfs_extlen_t len; 63 xfs_nlink_t refcount; 64 bool has_cowflag; 65 int error = 0; 66 67 bno = be32_to_cpu(rec->refc.rc_startblock); 68 len = be32_to_cpu(rec->refc.rc_blockcount); 69 refcount = be32_to_cpu(rec->refc.rc_refcount); 70 71 /* Only CoW records can have refcount == 1. */ 72 has_cowflag = (bno & XFS_REFC_COW_START); 73 if ((refcount == 1 && !has_cowflag) || (refcount != 1 && has_cowflag)) 74 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 75 76 /* Check the extent. */ 77 bno &= ~XFS_REFC_COW_START; 78 if (bno + len <= bno || 79 !xfs_verify_agbno(mp, agno, bno) || 80 !xfs_verify_agbno(mp, agno, bno + len - 1)) 81 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 82 83 if (refcount == 0) 84 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0); 85 86 return error; 87 } 88 89 /* Scrub the refcount btree for some AG. */ 90 int 91 xfs_scrub_refcountbt( 92 struct xfs_scrub_context *sc) 93 { 94 struct xfs_owner_info oinfo; 95 96 xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_REFC); 97 return xfs_scrub_btree(sc, sc->sa.refc_cur, xfs_scrub_refcountbt_rec, 98 &oinfo, NULL); 99 } 100