1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2017-2023 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_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 #include "xfs_ag.h"
19
20 /*
21 * Set us up to scrub free space btrees.
22 */
23 int
xchk_setup_ag_allocbt(struct xfs_scrub * sc)24 xchk_setup_ag_allocbt(
25 struct xfs_scrub *sc)
26 {
27 if (xchk_need_intent_drain(sc))
28 xchk_fsgates_enable(sc, XCHK_FSGATES_DRAIN);
29
30 return xchk_setup_ag_btree(sc, false);
31 }
32
33 /* Free space btree scrubber. */
34
35 struct xchk_alloc {
36 /* Previous free space extent. */
37 struct xfs_alloc_rec_incore prev;
38 };
39
40 /*
41 * Ensure there's a corresponding cntbt/bnobt record matching this
42 * bnobt/cntbt record, respectively.
43 */
44 STATIC void
xchk_allocbt_xref_other(struct xfs_scrub * sc,xfs_agblock_t agbno,xfs_extlen_t len)45 xchk_allocbt_xref_other(
46 struct xfs_scrub *sc,
47 xfs_agblock_t agbno,
48 xfs_extlen_t len)
49 {
50 struct xfs_btree_cur **pcur;
51 xfs_agblock_t fbno;
52 xfs_extlen_t flen;
53 int has_otherrec;
54 int error;
55
56 if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
57 pcur = &sc->sa.cnt_cur;
58 else
59 pcur = &sc->sa.bno_cur;
60 if (!*pcur || xchk_skip_xref(sc->sm))
61 return;
62
63 error = xfs_alloc_lookup_le(*pcur, agbno, len, &has_otherrec);
64 if (!xchk_should_check_xref(sc, &error, pcur))
65 return;
66 if (!has_otherrec) {
67 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
68 return;
69 }
70
71 error = xfs_alloc_get_rec(*pcur, &fbno, &flen, &has_otherrec);
72 if (!xchk_should_check_xref(sc, &error, pcur))
73 return;
74 if (!has_otherrec) {
75 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
76 return;
77 }
78
79 if (fbno != agbno || flen != len)
80 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
81 }
82
83 /* Cross-reference with the other btrees. */
84 STATIC void
xchk_allocbt_xref(struct xfs_scrub * sc,const struct xfs_alloc_rec_incore * irec)85 xchk_allocbt_xref(
86 struct xfs_scrub *sc,
87 const struct xfs_alloc_rec_incore *irec)
88 {
89 xfs_agblock_t agbno = irec->ar_startblock;
90 xfs_extlen_t len = irec->ar_blockcount;
91
92 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
93 return;
94
95 xchk_allocbt_xref_other(sc, agbno, len);
96 xchk_xref_is_not_inode_chunk(sc, agbno, len);
97 xchk_xref_has_no_owner(sc, agbno, len);
98 xchk_xref_is_not_shared(sc, agbno, len);
99 xchk_xref_is_not_cow_staging(sc, agbno, len);
100 }
101
102 /* Flag failures for records that could be merged. */
103 STATIC void
xchk_allocbt_mergeable(struct xchk_btree * bs,struct xchk_alloc * ca,const struct xfs_alloc_rec_incore * irec)104 xchk_allocbt_mergeable(
105 struct xchk_btree *bs,
106 struct xchk_alloc *ca,
107 const struct xfs_alloc_rec_incore *irec)
108 {
109 if (bs->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
110 return;
111
112 if (ca->prev.ar_blockcount > 0 &&
113 ca->prev.ar_startblock + ca->prev.ar_blockcount == irec->ar_startblock &&
114 ca->prev.ar_blockcount + irec->ar_blockcount < (uint32_t)~0U)
115 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
116
117 memcpy(&ca->prev, irec, sizeof(*irec));
118 }
119
120 /* Scrub a bnobt/cntbt record. */
121 STATIC int
xchk_allocbt_rec(struct xchk_btree * bs,const union xfs_btree_rec * rec)122 xchk_allocbt_rec(
123 struct xchk_btree *bs,
124 const union xfs_btree_rec *rec)
125 {
126 struct xfs_alloc_rec_incore irec;
127 struct xchk_alloc *ca = bs->private;
128
129 xfs_alloc_btrec_to_irec(rec, &irec);
130 if (xfs_alloc_check_irec(bs->cur, &irec) != NULL) {
131 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
132 return 0;
133 }
134
135 xchk_allocbt_mergeable(bs, ca, &irec);
136 xchk_allocbt_xref(bs->sc, &irec);
137
138 return 0;
139 }
140
141 /* Scrub the freespace btrees for some AG. */
142 STATIC int
xchk_allocbt(struct xfs_scrub * sc,xfs_btnum_t which)143 xchk_allocbt(
144 struct xfs_scrub *sc,
145 xfs_btnum_t which)
146 {
147 struct xchk_alloc ca = { };
148 struct xfs_btree_cur *cur;
149
150 cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur;
151 return xchk_btree(sc, cur, xchk_allocbt_rec, &XFS_RMAP_OINFO_AG, &ca);
152 }
153
154 int
xchk_bnobt(struct xfs_scrub * sc)155 xchk_bnobt(
156 struct xfs_scrub *sc)
157 {
158 return xchk_allocbt(sc, XFS_BTNUM_BNO);
159 }
160
161 int
xchk_cntbt(struct xfs_scrub * sc)162 xchk_cntbt(
163 struct xfs_scrub *sc)
164 {
165 return xchk_allocbt(sc, XFS_BTNUM_CNT);
166 }
167
168 /* xref check that the extent is not free */
169 void
xchk_xref_is_used_space(struct xfs_scrub * sc,xfs_agblock_t agbno,xfs_extlen_t len)170 xchk_xref_is_used_space(
171 struct xfs_scrub *sc,
172 xfs_agblock_t agbno,
173 xfs_extlen_t len)
174 {
175 enum xbtree_recpacking outcome;
176 int error;
177
178 if (!sc->sa.bno_cur || xchk_skip_xref(sc->sm))
179 return;
180
181 error = xfs_alloc_has_records(sc->sa.bno_cur, agbno, len, &outcome);
182 if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur))
183 return;
184 if (outcome != XBTREE_RECPACKING_EMPTY)
185 xchk_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0);
186 }
187