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[J-linux.git] / fs / xfs / scrub / rgsuper.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) 2022-2024 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_rtgroup.h"
13 #include "xfs_log_format.h"
14 #include "xfs_trans.h"
15 #include "xfs_sb.h"
16 #include "scrub/scrub.h"
17 #include "scrub/common.h"
18 #include "scrub/repair.h"
19
20 /* Set us up with a transaction and an empty context. */
21 int
22 xchk_setup_rgsuperblock(
23         struct xfs_scrub        *sc)
24 {
25         return xchk_trans_alloc(sc, 0);
26 }
27
28 /* Cross-reference with the other rt metadata. */
29 STATIC void
30 xchk_rgsuperblock_xref(
31         struct xfs_scrub        *sc)
32 {
33         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
34                 return;
35
36         xchk_xref_is_used_rt_space(sc, xfs_rgbno_to_rtb(sc->sr.rtg, 0), 1);
37 }
38
39 int
40 xchk_rgsuperblock(
41         struct xfs_scrub        *sc)
42 {
43         xfs_rgnumber_t          rgno = sc->sm->sm_agno;
44         int                     error;
45
46         /*
47          * Only rtgroup 0 has a superblock.  We may someday want to use higher
48          * rgno for other functions, similar to what we do with the primary
49          * super scrub function.
50          */
51         if (rgno != 0)
52                 return -ENOENT;
53
54         /*
55          * Grab an active reference to the rtgroup structure.  If we can't get
56          * it, we're racing with something that's tearing down the group, so
57          * signal that the group no longer exists.  Take the rtbitmap in shared
58          * mode so that the group can't change while we're doing things.
59          */
60         error = xchk_rtgroup_init_existing(sc, rgno, &sc->sr);
61         if (!xchk_xref_process_error(sc, 0, 0, &error))
62                 return error;
63
64         xchk_rtgroup_lock(&sc->sr, XFS_RTGLOCK_BITMAP_SHARED);
65
66         /*
67          * Since we already validated the rt superblock at mount time, we don't
68          * need to check its contents again.  All we need is to cross-reference.
69          */
70         xchk_rgsuperblock_xref(sc);
71         return 0;
72 }
73
74 #ifdef CONFIG_XFS_ONLINE_REPAIR
75 int
76 xrep_rgsuperblock(
77         struct xfs_scrub        *sc)
78 {
79         ASSERT(rtg_rgno(sc->sr.rtg) == 0);
80
81         xfs_log_sb(sc->tp);
82         return 0;
83 }
84 #endif /* CONFIG_XFS_ONLINE_REPAIR */
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