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