summaryrefslogtreecommitdiff
path: root/fs/xfs/scrub/alloc.c
blob: 517c079d3f68db704a803469bbcdc742c2a42851 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/*
 * Copyright (C) 2017 Oracle.  All Rights Reserved.
 *
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_btree.h"
#include "xfs_bit.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_alloc.h"
#include "xfs_rmap.h"
#include "xfs_alloc.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/btree.h"
#include "scrub/trace.h"

/*
 * Set us up to scrub free space btrees.
 */
int
xfs_scrub_setup_ag_allocbt(
	struct xfs_scrub_context	*sc,
	struct xfs_inode		*ip)
{
	return xfs_scrub_setup_ag_btree(sc, ip, false);
}

/* Free space btree scrubber. */
/*
 * Ensure there's a corresponding cntbt/bnobt record matching this
 * bnobt/cntbt record, respectively.
 */
STATIC void
xfs_scrub_allocbt_xref_other(
	struct xfs_scrub_context	*sc,
	xfs_agblock_t			agbno,
	xfs_extlen_t			len)
{
	struct xfs_btree_cur		**pcur;
	xfs_agblock_t			fbno;
	xfs_extlen_t			flen;
	int				has_otherrec;
	int				error;

	if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
		pcur = &sc->sa.cnt_cur;
	else
		pcur = &sc->sa.bno_cur;
	if (!*pcur)
		return;

	error = xfs_alloc_lookup_le(*pcur, agbno, len, &has_otherrec);
	if (!xfs_scrub_should_check_xref(sc, &error, pcur))
		return;
	if (!has_otherrec) {
		xfs_scrub_btree_xref_set_corrupt(sc, *pcur, 0);
		return;
	}

	error = xfs_alloc_get_rec(*pcur, &fbno, &flen, &has_otherrec);
	if (!xfs_scrub_should_check_xref(sc, &error, pcur))
		return;
	if (!has_otherrec) {
		xfs_scrub_btree_xref_set_corrupt(sc, *pcur, 0);
		return;
	}

	if (fbno != agbno || flen != len)
		xfs_scrub_btree_xref_set_corrupt(sc, *pcur, 0);
}

/* Cross-reference with the other btrees. */
STATIC void
xfs_scrub_allocbt_xref(
	struct xfs_scrub_context	*sc,
	xfs_agblock_t			agbno,
	xfs_extlen_t			len)
{
	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
		return;

	xfs_scrub_allocbt_xref_other(sc, agbno, len);
	xfs_scrub_xref_is_not_inode_chunk(sc, agbno, len);
	xfs_scrub_xref_has_no_owner(sc, agbno, len);
	xfs_scrub_xref_is_not_shared(sc, agbno, len);
}

/* Scrub a bnobt/cntbt record. */
STATIC int
xfs_scrub_allocbt_rec(
	struct xfs_scrub_btree		*bs,
	union xfs_btree_rec		*rec)
{
	struct xfs_mount		*mp = bs->cur->bc_mp;
	xfs_agnumber_t			agno = bs->cur->bc_private.a.agno;
	xfs_agblock_t			bno;
	xfs_extlen_t			len;
	int				error = 0;

	bno = be32_to_cpu(rec->alloc.ar_startblock);
	len = be32_to_cpu(rec->alloc.ar_blockcount);

	if (bno + len <= bno ||
	    !xfs_verify_agbno(mp, agno, bno) ||
	    !xfs_verify_agbno(mp, agno, bno + len - 1))
		xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);

	xfs_scrub_allocbt_xref(bs->sc, bno, len);

	return error;
}

/* Scrub the freespace btrees for some AG. */
STATIC int
xfs_scrub_allocbt(
	struct xfs_scrub_context	*sc,
	xfs_btnum_t			which)
{
	struct xfs_owner_info		oinfo;
	struct xfs_btree_cur		*cur;

	xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
	cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur;
	return xfs_scrub_btree(sc, cur, xfs_scrub_allocbt_rec, &oinfo, NULL);
}

int
xfs_scrub_bnobt(
	struct xfs_scrub_context	*sc)
{
	return xfs_scrub_allocbt(sc, XFS_BTNUM_BNO);
}

int
xfs_scrub_cntbt(
	struct xfs_scrub_context	*sc)
{
	return xfs_scrub_allocbt(sc, XFS_BTNUM_CNT);
}

/* xref check that the extent is not free */
void
xfs_scrub_xref_is_used_space(
	struct xfs_scrub_context	*sc,
	xfs_agblock_t			agbno,
	xfs_extlen_t			len)
{
	bool				is_freesp;
	int				error;

	if (!sc->sa.bno_cur)
		return;

	error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp);
	if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.bno_cur))
		return;
	if (is_freesp)
		xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0);
}