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_log_format.h" 13 #include "xfs_trans.h" 14 #include "xfs_rtalloc.h" 15 #include "xfs_inode.h" 16 #include "xfs_bmap.h" 17 #include "scrub/scrub.h" 18 #include "scrub/common.h" 19 20 /* Set us up with the realtime metadata locked. */ 21 int 22 xchk_setup_rt( 23 struct xfs_scrub *sc, 24 struct xfs_inode *ip) 25 { 26 int error; 27 28 error = xchk_setup_fs(sc, ip); 29 if (error) 30 return error; 31 32 sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP; 33 sc->ip = sc->mp->m_rbmip; 34 xfs_ilock(sc->ip, sc->ilock_flags); 35 36 return 0; 37 } 38 39 /* Realtime bitmap. */ 40 41 /* Scrub a free extent record from the realtime bitmap. */ 42 STATIC int 43 xchk_rtbitmap_rec( 44 struct xfs_trans *tp, 45 struct xfs_rtalloc_rec *rec, 46 void *priv) 47 { 48 struct xfs_scrub *sc = priv; 49 xfs_rtblock_t startblock; 50 xfs_rtblock_t blockcount; 51 52 startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize; 53 blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize; 54 55 if (startblock + blockcount <= startblock || 56 !xfs_verify_rtbno(sc->mp, startblock) || 57 !xfs_verify_rtbno(sc->mp, startblock + blockcount - 1)) 58 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0); 59 return 0; 60 } 61 62 /* Make sure the entire rtbitmap file is mapped with written extents. */ 63 STATIC int 64 xchk_rtbitmap_check_extents( 65 struct xfs_scrub *sc) 66 { 67 struct xfs_mount *mp = sc->mp; 68 struct xfs_bmbt_irec map; 69 xfs_rtblock_t off; 70 int nmap; 71 int error = 0; 72 73 for (off = 0; off < mp->m_sb.sb_rbmblocks;) { 74 if (xchk_should_terminate(sc, &error) || 75 (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) 76 break; 77 78 /* Make sure we have a written extent. */ 79 nmap = 1; 80 error = xfs_bmapi_read(mp->m_rbmip, off, 81 mp->m_sb.sb_rbmblocks - off, &map, &nmap, 82 XFS_DATA_FORK); 83 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, off, &error)) 84 break; 85 86 if (nmap != 1 || !xfs_bmap_is_written_extent(&map)) { 87 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, off); 88 break; 89 } 90 91 off += map.br_blockcount; 92 } 93 94 return error; 95 } 96 97 /* Scrub the realtime bitmap. */ 98 int 99 xchk_rtbitmap( 100 struct xfs_scrub *sc) 101 { 102 int error; 103 104 /* Is the size of the rtbitmap correct? */ 105 if (sc->mp->m_rbmip->i_d.di_size != 106 XFS_FSB_TO_B(sc->mp, sc->mp->m_sb.sb_rbmblocks)) { 107 xchk_ino_set_corrupt(sc, sc->mp->m_rbmip->i_ino); 108 return 0; 109 } 110 111 /* Invoke the fork scrubber. */ 112 error = xchk_metadata_inode_forks(sc); 113 if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) 114 return error; 115 116 error = xchk_rtbitmap_check_extents(sc); 117 if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) 118 return error; 119 120 error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc); 121 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error)) 122 goto out; 123 124 out: 125 return error; 126 } 127 128 /* Scrub the realtime summary. */ 129 int 130 xchk_rtsummary( 131 struct xfs_scrub *sc) 132 { 133 struct xfs_inode *rsumip = sc->mp->m_rsumip; 134 struct xfs_inode *old_ip = sc->ip; 135 uint old_ilock_flags = sc->ilock_flags; 136 int error = 0; 137 138 /* 139 * We ILOCK'd the rt bitmap ip in the setup routine, now lock the 140 * rt summary ip in compliance with the rt inode locking rules. 141 * 142 * Since we switch sc->ip to rsumip we have to save the old ilock 143 * flags so that we don't mix up the inode state that @sc tracks. 144 */ 145 sc->ip = rsumip; 146 sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM; 147 xfs_ilock(sc->ip, sc->ilock_flags); 148 149 /* Invoke the fork scrubber. */ 150 error = xchk_metadata_inode_forks(sc); 151 if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) 152 goto out; 153 154 /* XXX: implement this some day */ 155 xchk_set_incomplete(sc); 156 out: 157 /* Switch back to the rtbitmap inode and lock flags. */ 158 xfs_iunlock(sc->ip, sc->ilock_flags); 159 sc->ilock_flags = old_ilock_flags; 160 sc->ip = old_ip; 161 return error; 162 } 163 164 165 /* xref check that the extent is not free in the rtbitmap */ 166 void 167 xchk_xref_is_used_rt_space( 168 struct xfs_scrub *sc, 169 xfs_rtblock_t fsbno, 170 xfs_extlen_t len) 171 { 172 xfs_rtblock_t startext; 173 xfs_rtblock_t endext; 174 xfs_rtblock_t extcount; 175 bool is_free; 176 int error; 177 178 if (xchk_skip_xref(sc->sm)) 179 return; 180 181 startext = fsbno; 182 endext = fsbno + len - 1; 183 do_div(startext, sc->mp->m_sb.sb_rextsize); 184 do_div(endext, sc->mp->m_sb.sb_rextsize); 185 extcount = endext - startext + 1; 186 xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP); 187 error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount, 188 &is_free); 189 if (!xchk_should_check_xref(sc, &error, NULL)) 190 goto out_unlock; 191 if (is_free) 192 xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino); 193 out_unlock: 194 xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP); 195 } 196