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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_btree.h"
#include "xfs_sb.h"
#include "xfs_health.h"
#include "scrub/scrub.h"
/*
* Scrub and In-Core Filesystem Health Assessments
* ===============================================
*
* Online scrub and repair have the time and the ability to perform stronger
* checks than we can do from the metadata verifiers, because they can
* cross-reference records between data structures. Therefore, scrub is in a
* good position to update the online filesystem health assessments to reflect
* the good/bad state of the data structure.
*
* We therefore extend scrub in the following ways to achieve this:
*
* 1. Create a "sick_mask" field in the scrub context. When we're setting up a
* scrub call, set this to the default XFS_SICK_* flag(s) for the selected
* scrub type (call it A). Scrub and repair functions can override the default
* sick_mask value if they choose.
*
* 2. If the scrubber returns a runtime error code, we exit making no changes
* to the incore sick state.
*
* 3. If the scrubber finds that A is clean, use sick_mask to clear the incore
* sick flags before exiting.
*
* 4. If the scrubber finds that A is corrupt, use sick_mask to set the incore
* sick flags. If the user didn't want to repair then we exit, leaving the
* metadata structure unfixed and the sick flag set.
*
* 5. Now we know that A is corrupt and the user wants to repair, so run the
* repairer. If the repairer returns an error code, we exit with that error
* code, having made no further changes to the incore sick state.
*
* 6. If repair rebuilds A correctly and the subsequent re-scrub of A is clean,
* use sick_mask to clear the incore sick flags. This should have the effect
* that A is no longer marked sick.
*
* 7. If repair rebuilds A incorrectly, the re-scrub will find it corrupt and
* use sick_mask to set the incore sick flags. This should have no externally
* visible effect since we already set them in step (4).
*
* There are some complications to this story, however. For certain types of
* complementary metadata indices (e.g. inobt/finobt), it is easier to rebuild
* both structures at the same time. The following principles apply to this
* type of repair strategy:
*
* 8. Any repair function that rebuilds multiple structures should update
* sick_mask_visible to reflect whatever other structures are rebuilt, and
* verify that all the rebuilt structures can pass a scrub check. The outcomes
* of 5-7 still apply, but with a sick_mask that covers everything being
* rebuilt.
*/
/* Map our scrub type to a sick mask and a set of health update functions. */
enum xchk_health_group {
XHG_FS = 1,
XHG_RT,
XHG_AG,
XHG_INO,
};
struct xchk_health_map {
enum xchk_health_group group;
unsigned int sick_mask;
};
static const struct xchk_health_map type_to_health_flag[XFS_SCRUB_TYPE_NR] = {
[XFS_SCRUB_TYPE_SB] = { XHG_AG, XFS_SICK_AG_SB },
[XFS_SCRUB_TYPE_AGF] = { XHG_AG, XFS_SICK_AG_AGF },
[XFS_SCRUB_TYPE_AGFL] = { XHG_AG, XFS_SICK_AG_AGFL },
[XFS_SCRUB_TYPE_AGI] = { XHG_AG, XFS_SICK_AG_AGI },
[XFS_SCRUB_TYPE_BNOBT] = { XHG_AG, XFS_SICK_AG_BNOBT },
[XFS_SCRUB_TYPE_CNTBT] = { XHG_AG, XFS_SICK_AG_CNTBT },
[XFS_SCRUB_TYPE_INOBT] = { XHG_AG, XFS_SICK_AG_INOBT },
[XFS_SCRUB_TYPE_FINOBT] = { XHG_AG, XFS_SICK_AG_FINOBT },
[XFS_SCRUB_TYPE_RMAPBT] = { XHG_AG, XFS_SICK_AG_RMAPBT },
[XFS_SCRUB_TYPE_REFCNTBT] = { XHG_AG, XFS_SICK_AG_REFCNTBT },
[XFS_SCRUB_TYPE_INODE] = { XHG_INO, XFS_SICK_INO_CORE },
[XFS_SCRUB_TYPE_BMBTD] = { XHG_INO, XFS_SICK_INO_BMBTD },
[XFS_SCRUB_TYPE_BMBTA] = { XHG_INO, XFS_SICK_INO_BMBTA },
[XFS_SCRUB_TYPE_BMBTC] = { XHG_INO, XFS_SICK_INO_BMBTC },
[XFS_SCRUB_TYPE_DIR] = { XHG_INO, XFS_SICK_INO_DIR },
[XFS_SCRUB_TYPE_XATTR] = { XHG_INO, XFS_SICK_INO_XATTR },
[XFS_SCRUB_TYPE_SYMLINK] = { XHG_INO, XFS_SICK_INO_SYMLINK },
[XFS_SCRUB_TYPE_PARENT] = { XHG_INO, XFS_SICK_INO_PARENT },
[XFS_SCRUB_TYPE_RTBITMAP] = { XHG_RT, XFS_SICK_RT_BITMAP },
[XFS_SCRUB_TYPE_RTSUM] = { XHG_RT, XFS_SICK_RT_SUMMARY },
[XFS_SCRUB_TYPE_UQUOTA] = { XHG_FS, XFS_SICK_FS_UQUOTA },
[XFS_SCRUB_TYPE_GQUOTA] = { XHG_FS, XFS_SICK_FS_GQUOTA },
[XFS_SCRUB_TYPE_PQUOTA] = { XHG_FS, XFS_SICK_FS_PQUOTA },
[XFS_SCRUB_TYPE_FSCOUNTERS] = { XHG_FS, XFS_SICK_FS_COUNTERS },
};
/* Return the health status mask for this scrub type. */
unsigned int
xchk_health_mask_for_scrub_type(
__u32 scrub_type)
{
return type_to_health_flag[scrub_type].sick_mask;
}
/*
* Update filesystem health assessments based on what we found and did.
*
* If the scrubber finds errors, we mark sick whatever's mentioned in
* sick_mask, no matter whether this is a first scan or an
* evaluation of repair effectiveness.
*
* Otherwise, no direct corruption was found, so mark whatever's in
* sick_mask as healthy.
*/
void
xchk_update_health(
struct xfs_scrub *sc)
{
struct xfs_perag *pag;
bool bad;
if (!sc->sick_mask)
return;
bad = (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT);
switch (type_to_health_flag[sc->sm->sm_type].group) {
case XHG_AG:
pag = xfs_perag_get(sc->mp, sc->sm->sm_agno);
if (bad)
xfs_ag_mark_sick(pag, sc->sick_mask);
else
xfs_ag_mark_healthy(pag, sc->sick_mask);
xfs_perag_put(pag);
break;
case XHG_INO:
if (!sc->ip)
return;
if (bad)
xfs_inode_mark_sick(sc->ip, sc->sick_mask);
else
xfs_inode_mark_healthy(sc->ip, sc->sick_mask);
break;
case XHG_FS:
if (bad)
xfs_fs_mark_sick(sc->mp, sc->sick_mask);
else
xfs_fs_mark_healthy(sc->mp, sc->sick_mask);
break;
case XHG_RT:
if (bad)
xfs_rt_mark_sick(sc->mp, sc->sick_mask);
else
xfs_rt_mark_healthy(sc->mp, sc->sick_mask);
break;
default:
ASSERT(0);
break;
}
}
/* Is the given per-AG btree healthy enough for scanning? */
bool
xchk_ag_btree_healthy_enough(
struct xfs_scrub *sc,
struct xfs_perag *pag,
xfs_btnum_t btnum)
{
unsigned int mask = 0;
/*
* We always want the cursor if it's the same type as whatever we're
* scrubbing, even if we already know the structure is corrupt.
*
* Otherwise, we're only interested in the btree for cross-referencing.
* If we know the btree is bad then don't bother, just set XFAIL.
*/
switch (btnum) {
case XFS_BTNUM_BNO:
if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
return true;
mask = XFS_SICK_AG_BNOBT;
break;
case XFS_BTNUM_CNT:
if (sc->sm->sm_type == XFS_SCRUB_TYPE_CNTBT)
return true;
mask = XFS_SICK_AG_CNTBT;
break;
case XFS_BTNUM_INO:
if (sc->sm->sm_type == XFS_SCRUB_TYPE_INOBT)
return true;
mask = XFS_SICK_AG_INOBT;
break;
case XFS_BTNUM_FINO:
if (sc->sm->sm_type == XFS_SCRUB_TYPE_FINOBT)
return true;
mask = XFS_SICK_AG_FINOBT;
break;
case XFS_BTNUM_RMAP:
if (sc->sm->sm_type == XFS_SCRUB_TYPE_RMAPBT)
return true;
mask = XFS_SICK_AG_RMAPBT;
break;
case XFS_BTNUM_REFC:
if (sc->sm->sm_type == XFS_SCRUB_TYPE_REFCNTBT)
return true;
mask = XFS_SICK_AG_REFCNTBT;
break;
default:
ASSERT(0);
return true;
}
if (xfs_ag_has_sickness(pag, mask)) {
sc->sm->sm_flags |= XFS_SCRUB_OFLAG_XFAIL;
return false;
}
return true;
}
|
