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_defer.h"
13 #include "xfs_btree.h"
14 #include "xfs_bit.h"
15 #include "xfs_log_format.h"
16 #include "xfs_trans.h"
17 #include "xfs_sb.h"
18 #include "xfs_alloc.h"
19 #include "xfs_rmap.h"
20 #include "scrub/xfs_scrub.h"
21 #include "scrub/scrub.h"
22 #include "scrub/common.h"
23 #include "scrub/btree.h"
24 #include "scrub/trace.h"
25
26 /*
27 * Set us up to scrub free space btrees.
28 */
29 int
xchk_setup_ag_allocbt(struct xfs_scrub * sc,struct xfs_inode * ip)30 xchk_setup_ag_allocbt(
31 struct xfs_scrub *sc,
32 struct xfs_inode *ip)
33 {
34 return xchk_setup_ag_btree(sc, ip, false);
35 }
36
37 /* Free space btree scrubber. */
38 /*
39 * Ensure there's a corresponding cntbt/bnobt record matching this
40 * bnobt/cntbt record, respectively.
41 */
42 STATIC void
xchk_allocbt_xref_other(struct xfs_scrub * sc,xfs_agblock_t agbno,xfs_extlen_t len)43 xchk_allocbt_xref_other(
44 struct xfs_scrub *sc,
45 xfs_agblock_t agbno,
46 xfs_extlen_t len)
47 {
48 struct xfs_btree_cur **pcur;
49 xfs_agblock_t fbno;
50 xfs_extlen_t flen;
51 int has_otherrec;
52 int error;
53
54 if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
55 pcur = &sc->sa.cnt_cur;
56 else
57 pcur = &sc->sa.bno_cur;
58 if (!*pcur || xchk_skip_xref(sc->sm))
59 return;
60
61 error = xfs_alloc_lookup_le(*pcur, agbno, len, &has_otherrec);
62 if (!xchk_should_check_xref(sc, &error, pcur))
63 return;
64 if (!has_otherrec) {
65 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
66 return;
67 }
68
69 error = xfs_alloc_get_rec(*pcur, &fbno, &flen, &has_otherrec);
70 if (!xchk_should_check_xref(sc, &error, pcur))
71 return;
72 if (!has_otherrec) {
73 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
74 return;
75 }
76
77 if (fbno != agbno || flen != len)
78 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
79 }
80
81 /* Cross-reference with the other btrees. */
82 STATIC void
xchk_allocbt_xref(struct xfs_scrub * sc,xfs_agblock_t agbno,xfs_extlen_t len)83 xchk_allocbt_xref(
84 struct xfs_scrub *sc,
85 xfs_agblock_t agbno,
86 xfs_extlen_t len)
87 {
88 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
89 return;
90
91 xchk_allocbt_xref_other(sc, agbno, len);
92 xchk_xref_is_not_inode_chunk(sc, agbno, len);
93 xchk_xref_has_no_owner(sc, agbno, len);
94 xchk_xref_is_not_shared(sc, agbno, len);
95 }
96
97 /* Scrub a bnobt/cntbt record. */
98 STATIC int
xchk_allocbt_rec(struct xchk_btree * bs,union xfs_btree_rec * rec)99 xchk_allocbt_rec(
100 struct xchk_btree *bs,
101 union xfs_btree_rec *rec)
102 {
103 struct xfs_mount *mp = bs->cur->bc_mp;
104 xfs_agnumber_t agno = bs->cur->bc_private.a.agno;
105 xfs_agblock_t bno;
106 xfs_extlen_t len;
107 int error = 0;
108
109 bno = be32_to_cpu(rec->alloc.ar_startblock);
110 len = be32_to_cpu(rec->alloc.ar_blockcount);
111
112 if (bno + len <= bno ||
113 !xfs_verify_agbno(mp, agno, bno) ||
114 !xfs_verify_agbno(mp, agno, bno + len - 1))
115 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
116
117 xchk_allocbt_xref(bs->sc, bno, len);
118
119 return error;
120 }
121
122 /* Scrub the freespace btrees for some AG. */
123 STATIC int
xchk_allocbt(struct xfs_scrub * sc,xfs_btnum_t which)124 xchk_allocbt(
125 struct xfs_scrub *sc,
126 xfs_btnum_t which)
127 {
128 struct xfs_owner_info oinfo;
129 struct xfs_btree_cur *cur;
130
131 xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
132 cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur;
133 return xchk_btree(sc, cur, xchk_allocbt_rec, &oinfo, NULL);
134 }
135
136 int
xchk_bnobt(struct xfs_scrub * sc)137 xchk_bnobt(
138 struct xfs_scrub *sc)
139 {
140 return xchk_allocbt(sc, XFS_BTNUM_BNO);
141 }
142
143 int
xchk_cntbt(struct xfs_scrub * sc)144 xchk_cntbt(
145 struct xfs_scrub *sc)
146 {
147 return xchk_allocbt(sc, XFS_BTNUM_CNT);
148 }
149
150 /* xref check that the extent is not free */
151 void
xchk_xref_is_used_space(struct xfs_scrub * sc,xfs_agblock_t agbno,xfs_extlen_t len)152 xchk_xref_is_used_space(
153 struct xfs_scrub *sc,
154 xfs_agblock_t agbno,
155 xfs_extlen_t len)
156 {
157 bool is_freesp;
158 int error;
159
160 if (!sc->sa.bno_cur || xchk_skip_xref(sc->sm))
161 return;
162
163 error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp);
164 if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur))
165 return;
166 if (is_freesp)
167 xchk_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0);
168 }
169