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