1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2019 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
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"
15 #include "xfs_log_format.h"
16 #include "xfs_trans.h"
18 #include "xfs_inode.h"
19 #include "xfs_health.h"
20 #include "scrub/scrub.h"
21 #include "scrub/health.h"
24 * Scrub and In-Core Filesystem Health Assessments
25 * ===============================================
27 * Online scrub and repair have the time and the ability to perform stronger
28 * checks than we can do from the metadata verifiers, because they can
29 * cross-reference records between data structures. Therefore, scrub is in a
30 * good position to update the online filesystem health assessments to reflect
31 * the good/bad state of the data structure.
33 * We therefore extend scrub in the following ways to achieve this:
35 * 1. Create a "sick_mask" field in the scrub context. When we're setting up a
36 * scrub call, set this to the default XFS_SICK_* flag(s) for the selected
37 * scrub type (call it A). Scrub and repair functions can override the default
38 * sick_mask value if they choose.
40 * 2. If the scrubber returns a runtime error code, we exit making no changes
41 * to the incore sick state.
43 * 3. If the scrubber finds that A is clean, use sick_mask to clear the incore
44 * sick flags before exiting.
46 * 4. If the scrubber finds that A is corrupt, use sick_mask to set the incore
47 * sick flags. If the user didn't want to repair then we exit, leaving the
48 * metadata structure unfixed and the sick flag set.
50 * 5. Now we know that A is corrupt and the user wants to repair, so run the
51 * repairer. If the repairer returns an error code, we exit with that error
52 * code, having made no further changes to the incore sick state.
54 * 6. If repair rebuilds A correctly and the subsequent re-scrub of A is clean,
55 * use sick_mask to clear the incore sick flags. This should have the effect
56 * that A is no longer marked sick.
58 * 7. If repair rebuilds A incorrectly, the re-scrub will find it corrupt and
59 * use sick_mask to set the incore sick flags. This should have no externally
60 * visible effect since we already set them in step (4).
62 * There are some complications to this story, however. For certain types of
63 * complementary metadata indices (e.g. inobt/finobt), it is easier to rebuild
64 * both structures at the same time. The following principles apply to this
65 * type of repair strategy:
67 * 8. Any repair function that rebuilds multiple structures should update
68 * sick_mask_visible to reflect whatever other structures are rebuilt, and
69 * verify that all the rebuilt structures can pass a scrub check. The outcomes
70 * of 5-7 still apply, but with a sick_mask that covers everything being
74 /* Map our scrub type to a sick mask and a set of health update functions. */
76 enum xchk_health_group {
83 struct xchk_health_map {
84 enum xchk_health_group group;
85 unsigned int sick_mask;
88 static const struct xchk_health_map type_to_health_flag[XFS_SCRUB_TYPE_NR] = {
89 [XFS_SCRUB_TYPE_SB] = { XHG_AG, XFS_SICK_AG_SB },
90 [XFS_SCRUB_TYPE_AGF] = { XHG_AG, XFS_SICK_AG_AGF },
91 [XFS_SCRUB_TYPE_AGFL] = { XHG_AG, XFS_SICK_AG_AGFL },
92 [XFS_SCRUB_TYPE_AGI] = { XHG_AG, XFS_SICK_AG_AGI },
93 [XFS_SCRUB_TYPE_BNOBT] = { XHG_AG, XFS_SICK_AG_BNOBT },
94 [XFS_SCRUB_TYPE_CNTBT] = { XHG_AG, XFS_SICK_AG_CNTBT },
95 [XFS_SCRUB_TYPE_INOBT] = { XHG_AG, XFS_SICK_AG_INOBT },
96 [XFS_SCRUB_TYPE_FINOBT] = { XHG_AG, XFS_SICK_AG_FINOBT },
97 [XFS_SCRUB_TYPE_RMAPBT] = { XHG_AG, XFS_SICK_AG_RMAPBT },
98 [XFS_SCRUB_TYPE_REFCNTBT] = { XHG_AG, XFS_SICK_AG_REFCNTBT },
99 [XFS_SCRUB_TYPE_INODE] = { XHG_INO, XFS_SICK_INO_CORE },
100 [XFS_SCRUB_TYPE_BMBTD] = { XHG_INO, XFS_SICK_INO_BMBTD },
101 [XFS_SCRUB_TYPE_BMBTA] = { XHG_INO, XFS_SICK_INO_BMBTA },
102 [XFS_SCRUB_TYPE_BMBTC] = { XHG_INO, XFS_SICK_INO_BMBTC },
103 [XFS_SCRUB_TYPE_DIR] = { XHG_INO, XFS_SICK_INO_DIR },
104 [XFS_SCRUB_TYPE_XATTR] = { XHG_INO, XFS_SICK_INO_XATTR },
105 [XFS_SCRUB_TYPE_SYMLINK] = { XHG_INO, XFS_SICK_INO_SYMLINK },
106 [XFS_SCRUB_TYPE_PARENT] = { XHG_INO, XFS_SICK_INO_PARENT },
107 [XFS_SCRUB_TYPE_RTBITMAP] = { XHG_RT, XFS_SICK_RT_BITMAP },
108 [XFS_SCRUB_TYPE_RTSUM] = { XHG_RT, XFS_SICK_RT_SUMMARY },
109 [XFS_SCRUB_TYPE_UQUOTA] = { XHG_FS, XFS_SICK_FS_UQUOTA },
110 [XFS_SCRUB_TYPE_GQUOTA] = { XHG_FS, XFS_SICK_FS_GQUOTA },
111 [XFS_SCRUB_TYPE_PQUOTA] = { XHG_FS, XFS_SICK_FS_PQUOTA },
112 [XFS_SCRUB_TYPE_FSCOUNTERS] = { XHG_FS, XFS_SICK_FS_COUNTERS },
115 /* Return the health status mask for this scrub type. */
117 xchk_health_mask_for_scrub_type(
120 return type_to_health_flag[scrub_type].sick_mask;
124 * Update filesystem health assessments based on what we found and did.
126 * If the scrubber finds errors, we mark sick whatever's mentioned in
127 * sick_mask, no matter whether this is a first scan or an
128 * evaluation of repair effectiveness.
130 * Otherwise, no direct corruption was found, so mark whatever's in
131 * sick_mask as healthy.
135 struct xfs_scrub *sc)
137 struct xfs_perag *pag;
143 bad = (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT);
144 switch (type_to_health_flag[sc->sm->sm_type].group) {
146 pag = xfs_perag_get(sc->mp, sc->sm->sm_agno);
148 xfs_ag_mark_sick(pag, sc->sick_mask);
150 xfs_ag_mark_healthy(pag, sc->sick_mask);
157 xfs_inode_mark_sick(sc->ip, sc->sick_mask);
159 xfs_inode_mark_healthy(sc->ip, sc->sick_mask);
163 xfs_fs_mark_sick(sc->mp, sc->sick_mask);
165 xfs_fs_mark_healthy(sc->mp, sc->sick_mask);
169 xfs_rt_mark_sick(sc->mp, sc->sick_mask);
171 xfs_rt_mark_healthy(sc->mp, sc->sick_mask);
179 /* Is the given per-AG btree healthy enough for scanning? */
181 xchk_ag_btree_healthy_enough(
182 struct xfs_scrub *sc,
183 struct xfs_perag *pag,
186 unsigned int mask = 0;
189 * We always want the cursor if it's the same type as whatever we're
190 * scrubbing, even if we already know the structure is corrupt.
192 * Otherwise, we're only interested in the btree for cross-referencing.
193 * If we know the btree is bad then don't bother, just set XFAIL.
197 if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
199 mask = XFS_SICK_AG_BNOBT;
202 if (sc->sm->sm_type == XFS_SCRUB_TYPE_CNTBT)
204 mask = XFS_SICK_AG_CNTBT;
207 if (sc->sm->sm_type == XFS_SCRUB_TYPE_INOBT)
209 mask = XFS_SICK_AG_INOBT;
212 if (sc->sm->sm_type == XFS_SCRUB_TYPE_FINOBT)
214 mask = XFS_SICK_AG_FINOBT;
217 if (sc->sm->sm_type == XFS_SCRUB_TYPE_RMAPBT)
219 mask = XFS_SICK_AG_RMAPBT;
222 if (sc->sm->sm_type == XFS_SCRUB_TYPE_REFCNTBT)
224 mask = XFS_SICK_AG_REFCNTBT;
231 if (xfs_ag_has_sickness(pag, mask)) {
232 sc->sm->sm_flags |= XFS_SCRUB_OFLAG_XFAIL;