Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2017 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
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_btree.h"
13#include "xfs_alloc.h"
14#include "xfs_rmap.h"
15#include "scrub/scrub.h"
16#include "scrub/common.h"
17#include "scrub/btree.h"
18
19/*
20 * Set us up to scrub free space btrees.
21 */
22int
23xchk_setup_ag_allocbt(
24 struct xfs_scrub *sc,
25 struct xfs_inode *ip)
26{
27 return xchk_setup_ag_btree(sc, ip, false);
28}
29
30/* Free space btree scrubber. */
31/*
32 * Ensure there's a corresponding cntbt/bnobt record matching this
33 * bnobt/cntbt record, respectively.
34 */
35STATIC void
36xchk_allocbt_xref_other(
37 struct xfs_scrub *sc,
38 xfs_agblock_t agbno,
39 xfs_extlen_t len)
40{
41 struct xfs_btree_cur **pcur;
42 xfs_agblock_t fbno;
43 xfs_extlen_t flen;
44 int has_otherrec;
45 int error;
46
47 if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
48 pcur = &sc->sa.cnt_cur;
49 else
50 pcur = &sc->sa.bno_cur;
51 if (!*pcur || xchk_skip_xref(sc->sm))
52 return;
53
54 error = xfs_alloc_lookup_le(*pcur, agbno, len, &has_otherrec);
55 if (!xchk_should_check_xref(sc, &error, pcur))
56 return;
57 if (!has_otherrec) {
58 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
59 return;
60 }
61
62 error = xfs_alloc_get_rec(*pcur, &fbno, &flen, &has_otherrec);
63 if (!xchk_should_check_xref(sc, &error, pcur))
64 return;
65 if (!has_otherrec) {
66 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
67 return;
68 }
69
70 if (fbno != agbno || flen != len)
71 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
72}
73
74/* Cross-reference with the other btrees. */
75STATIC void
76xchk_allocbt_xref(
77 struct xfs_scrub *sc,
78 xfs_agblock_t agbno,
79 xfs_extlen_t len)
80{
81 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
82 return;
83
84 xchk_allocbt_xref_other(sc, agbno, len);
85 xchk_xref_is_not_inode_chunk(sc, agbno, len);
86 xchk_xref_has_no_owner(sc, agbno, len);
87 xchk_xref_is_not_shared(sc, agbno, len);
88}
89
90/* Scrub a bnobt/cntbt record. */
91STATIC int
92xchk_allocbt_rec(
93 struct xchk_btree *bs,
94 union xfs_btree_rec *rec)
95{
96 struct xfs_mount *mp = bs->cur->bc_mp;
97 xfs_agnumber_t agno = bs->cur->bc_private.a.agno;
98 xfs_agblock_t bno;
99 xfs_extlen_t len;
100 int error = 0;
101
102 bno = be32_to_cpu(rec->alloc.ar_startblock);
103 len = be32_to_cpu(rec->alloc.ar_blockcount);
104
105 if (bno + len <= bno ||
106 !xfs_verify_agbno(mp, agno, bno) ||
107 !xfs_verify_agbno(mp, agno, bno + len - 1))
108 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
109
110 xchk_allocbt_xref(bs->sc, bno, len);
111
112 return error;
113}
114
115/* Scrub the freespace btrees for some AG. */
116STATIC int
117xchk_allocbt(
118 struct xfs_scrub *sc,
119 xfs_btnum_t which)
120{
121 struct xfs_btree_cur *cur;
122
123 cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur;
124 return xchk_btree(sc, cur, xchk_allocbt_rec, &XFS_RMAP_OINFO_AG, NULL);
125}
126
127int
128xchk_bnobt(
129 struct xfs_scrub *sc)
130{
131 return xchk_allocbt(sc, XFS_BTNUM_BNO);
132}
133
134int
135xchk_cntbt(
136 struct xfs_scrub *sc)
137{
138 return xchk_allocbt(sc, XFS_BTNUM_CNT);
139}
140
141/* xref check that the extent is not free */
142void
143xchk_xref_is_used_space(
144 struct xfs_scrub *sc,
145 xfs_agblock_t agbno,
146 xfs_extlen_t len)
147{
148 bool is_freesp;
149 int error;
150
151 if (!sc->sa.bno_cur || xchk_skip_xref(sc->sm))
152 return;
153
154 error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp);
155 if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur))
156 return;
157 if (is_freesp)
158 xchk_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0);
159}