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 "scrub/scrub.h" 18 #include "scrub/common.h" 19 20 /* Set us up with the realtime metadata locked. */ 21 int 22 xchk_setup_rtbitmap( 23 struct xfs_scrub *sc) 24 { 25 int error; 26 27 error = xchk_trans_alloc(sc, 0); 28 if (error) 29 return error; 30 31 error = xchk_install_live_inode(sc, sc->mp->m_rbmip); 32 if (error) 33 return error; 34 35 xchk_ilock(sc, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP); 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_mount *mp, 45 struct xfs_trans *tp, 46 const struct xfs_rtalloc_rec *rec, 47 void *priv) 48 { 49 struct xfs_scrub *sc = priv; 50 xfs_rtblock_t startblock; 51 xfs_filblks_t blockcount; 52 53 startblock = xfs_rtx_to_rtb(mp, rec->ar_startext); 54 blockcount = xfs_rtx_to_rtb(mp, rec->ar_extcount); 55 56 if (!xfs_verify_rtbext(mp, startblock, blockcount)) 57 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0); 58 return 0; 59 } 60 61 /* Make sure the entire rtbitmap file is mapped with written extents. */ 62 STATIC int 63 xchk_rtbitmap_check_extents( 64 struct xfs_scrub *sc) 65 { 66 struct xfs_mount *mp = sc->mp; 67 struct xfs_bmbt_irec map; 68 xfs_rtblock_t off; 69 int nmap; 70 int error = 0; 71 72 for (off = 0; off < mp->m_sb.sb_rbmblocks;) { 73 if (xchk_should_terminate(sc, &error) || 74 (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) 75 break; 76 77 /* Make sure we have a written extent. */ 78 nmap = 1; 79 error = xfs_bmapi_read(mp->m_rbmip, off, 80 mp->m_sb.sb_rbmblocks - off, &map, &nmap, 81 XFS_DATA_FORK); 82 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, off, &error)) 83 break; 84 85 if (nmap != 1 || !xfs_bmap_is_written_extent(&map)) { 86 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, off); 87 break; 88 } 89 90 off += map.br_blockcount; 91 } 92 93 return error; 94 } 95 96 /* Scrub the realtime bitmap. */ 97 int 98 xchk_rtbitmap( 99 struct xfs_scrub *sc) 100 { 101 int error; 102 103 /* Is the size of the rtbitmap correct? */ 104 if (sc->mp->m_rbmip->i_disk_size != 105 XFS_FSB_TO_B(sc->mp, sc->mp->m_sb.sb_rbmblocks)) { 106 xchk_ino_set_corrupt(sc, sc->mp->m_rbmip->i_ino); 107 return 0; 108 } 109 110 /* Invoke the fork scrubber. */ 111 error = xchk_metadata_inode_forks(sc); 112 if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) 113 return error; 114 115 error = xchk_rtbitmap_check_extents(sc); 116 if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) 117 return error; 118 119 error = xfs_rtalloc_query_all(sc->mp, sc->tp, xchk_rtbitmap_rec, sc); 120 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error)) 121 goto out; 122 123 out: 124 return error; 125 } 126 127 /* xref check that the extent is not free in the rtbitmap */ 128 void 129 xchk_xref_is_used_rt_space( 130 struct xfs_scrub *sc, 131 xfs_rtblock_t rtbno, 132 xfs_extlen_t len) 133 { 134 xfs_rtxnum_t startext; 135 xfs_rtxnum_t endext; 136 bool is_free; 137 int error; 138 139 if (xchk_skip_xref(sc->sm)) 140 return; 141 142 startext = xfs_rtb_to_rtx(sc->mp, rtbno); 143 endext = xfs_rtb_to_rtx(sc->mp, rtbno + len - 1); 144 xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP); 145 error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, 146 endext - startext + 1, &is_free); 147 if (!xchk_should_check_xref(sc, &error, NULL)) 148 goto out_unlock; 149 if (is_free) 150 xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino); 151 out_unlock: 152 xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP); 153 } 154