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 <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_rtgroup.h"
13#include "xfs_log_format.h"
14#include "xfs_trans.h"
15#include "xfs_sb.h"
16#include "xfs_rmap.h"
17#include "scrub/scrub.h"
18#include "scrub/common.h"
19#include "scrub/repair.h"
20
21/* Set us up with a transaction and an empty context. */
22int
23xchk_setup_rgsuperblock(
24	struct xfs_scrub	*sc)
25{
26	return xchk_trans_alloc(sc, 0);
27}
28
29/* Cross-reference with the other rt metadata. */
30STATIC void
31xchk_rgsuperblock_xref(
32	struct xfs_scrub	*sc)
33{
34	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
35		return;
36
37	xchk_xref_is_used_rt_space(sc, xfs_rgbno_to_rtb(sc->sr.rtg, 0), 1);
38	xchk_xref_is_only_rt_owned_by(sc, 0, 1, &XFS_RMAP_OINFO_FS);
39}
40
41int
42xchk_rgsuperblock(
43	struct xfs_scrub	*sc)
44{
45	xfs_rgnumber_t		rgno = sc->sm->sm_agno;
46	int			error;
47
48	/*
49	 * Only rtgroup 0 has a superblock.  We may someday want to use higher
50	 * rgno for other functions, similar to what we do with the primary
51	 * super scrub function.
52	 */
53	if (rgno != 0)
54		return -ENOENT;
55
56	/*
57	 * Grab an active reference to the rtgroup structure.  If we can't get
58	 * it, we're racing with something that's tearing down the group, so
59	 * signal that the group no longer exists.  Take the rtbitmap in shared
60	 * mode so that the group can't change while we're doing things.
61	 */
62	error = xchk_rtgroup_init_existing(sc, rgno, &sc->sr);
63	if (!xchk_xref_process_error(sc, 0, 0, &error))
64		return error;
65
66	error = xchk_rtgroup_lock(sc, &sc->sr, XFS_RTGLOCK_BITMAP_SHARED);
67	if (error)
68		return error;
69
70	/*
71	 * Since we already validated the rt superblock at mount time, we don't
72	 * need to check its contents again.  All we need is to cross-reference.
73	 */
74	xchk_rgsuperblock_xref(sc);
75	return 0;
76}
77
78#ifdef CONFIG_XFS_ONLINE_REPAIR
79int
80xrep_rgsuperblock(
81	struct xfs_scrub	*sc)
82{
83	ASSERT(rtg_rgno(sc->sr.rtg) == 0);
84
85	xfs_log_sb(sc->tp);
86	return 0;
87}
88#endif /* CONFIG_XFS_ONLINE_REPAIR */