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[linux.git] / fs / xfs / scrub / rtbitmap.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2017-2023 Oracle.  All Rights Reserved.
4  * Author: Darrick J. Wong <[email protected]>
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_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_rtblock_t           blockcount;
52
53         startblock = rec->ar_startext * mp->m_sb.sb_rextsize;
54         blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize;
55
56         if (!xfs_verify_rtext(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           fsbno,
132         xfs_extlen_t            len)
133 {
134         xfs_rtblock_t           startext;
135         xfs_rtblock_t           endext;
136         xfs_rtblock_t           extcount;
137         bool                    is_free;
138         int                     error;
139
140         if (xchk_skip_xref(sc->sm))
141                 return;
142
143         startext = fsbno;
144         endext = fsbno + len - 1;
145         do_div(startext, sc->mp->m_sb.sb_rextsize);
146         do_div(endext, sc->mp->m_sb.sb_rextsize);
147         extcount = endext - startext + 1;
148         xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
149         error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
150                         &is_free);
151         if (!xchk_should_check_xref(sc, &error, NULL))
152                 goto out_unlock;
153         if (is_free)
154                 xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
155 out_unlock:
156         xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
157 }
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