1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2017-2023 Oracle. All Rights Reserved. 4 * Author: Darrick J. Wong <djwong@kernel.org> 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_rtbitmap.h" 15 #include "xfs_inode.h" 16 #include "xfs_bmap.h" 17 #include "xfs_sb.h" 18 #include "scrub/scrub.h" 19 #include "scrub/common.h" 20 21 /* Set us up with the realtime metadata locked. */ 22 int 23 xchk_setup_rtbitmap( 24 struct xfs_scrub *sc) 25 { 26 int error; 27 28 error = xchk_trans_alloc(sc, 0); 29 if (error) 30 return error; 31 32 error = xchk_install_live_inode(sc, sc->mp->m_rbmip); 33 if (error) 34 return error; 35 36 xchk_ilock(sc, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP); 37 return 0; 38 } 39 40 /* Realtime bitmap. */ 41 42 /* Scrub a free extent record from the realtime bitmap. */ 43 STATIC int 44 xchk_rtbitmap_rec( 45 struct xfs_mount *mp, 46 struct xfs_trans *tp, 47 const struct xfs_rtalloc_rec *rec, 48 void *priv) 49 { 50 struct xfs_scrub *sc = priv; 51 xfs_rtblock_t startblock; 52 xfs_rtblock_t blockcount; 53 54 startblock = rec->ar_startext * mp->m_sb.sb_rextsize; 55 blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize; 56 57 if (!xfs_verify_rtext(mp, startblock, blockcount)) 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_disk_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->mp, 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 /* xref check that the extent is not free in the rtbitmap */ 129 void 130 xchk_xref_is_used_rt_space( 131 struct xfs_scrub *sc, 132 xfs_rtblock_t fsbno, 133 xfs_extlen_t len) 134 { 135 xfs_rtblock_t startext; 136 xfs_rtblock_t endext; 137 xfs_rtblock_t extcount; 138 bool is_free; 139 int error; 140 141 if (xchk_skip_xref(sc->sm)) 142 return; 143 144 startext = fsbno; 145 endext = fsbno + len - 1; 146 do_div(startext, sc->mp->m_sb.sb_rextsize); 147 do_div(endext, sc->mp->m_sb.sb_rextsize); 148 extcount = endext - startext + 1; 149 xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP); 150 error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount, 151 &is_free); 152 if (!xchk_should_check_xref(sc, &error, NULL)) 153 goto out_unlock; 154 if (is_free) 155 xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino); 156 out_unlock: 157 xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP); 158 } 159