1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2018-2024 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_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_inode.h"
19 #include "xfs_alloc.h"
20 #include "xfs_ialloc.h"
21 #include "xfs_rmap.h"
22 #include "xfs_health.h"
23 #include "scrub/xfs_scrub.h"
24 #include "scrub/scrub.h"
25 #include "scrub/common.h"
26 #include "scrub/trace.h"
27 #include "scrub/repair.h"
28 #include "scrub/fscounters.h"
29
30 /*
31 * FS Summary Counters
32 * ===================
33 *
34 * We correct errors in the filesystem summary counters by setting them to the
35 * values computed during the obligatory scrub phase. However, we must be
36 * careful not to allow any other thread to change the counters while we're
37 * computing and setting new values. To achieve this, we freeze the
38 * filesystem for the whole operation if the REPAIR flag is set. The checking
39 * function is stricter when we've frozen the fs.
40 */
41
42 /*
43 * Reset the superblock counters. Caller is responsible for freezing the
44 * filesystem during the calculation and reset phases.
45 */
46 int
47 xrep_fscounters(
48 struct xfs_scrub *sc)
49 {
50 struct xfs_mount *mp = sc->mp;
51 struct xchk_fscounters *fsc = sc->buf;
52
53 /*
54 * Reinitialize the in-core counters from what we computed. We froze
55 * the filesystem, so there shouldn't be anyone else trying to modify
56 * these counters.
57 */
58 if (!fsc->frozen) {
59 ASSERT(fsc->frozen);
60 return -EFSCORRUPTED;
61 }
62
63 trace_xrep_reset_counters(mp, fsc);
64
65 percpu_counter_set(&mp->m_icount, fsc->icount);
66 percpu_counter_set(&mp->m_ifree, fsc->ifree);
67 percpu_counter_set(&mp->m_fdblocks, fsc->fdblocks);
68
69 /*
70 * Online repair is only supported on v5 file systems, which require
71 * lazy sb counters and thus no update of sb_fdblocks here. But as of
72 * now we don't support lazy counting sb_frextents yet, and thus need
73 * to also update it directly here. And for that we need to keep
74 * track of the delalloc reservations separately, as they are are
75 * subtracted from m_frextents, but not included in sb_frextents.
76 */
77 percpu_counter_set(&mp->m_frextents,
78 fsc->frextents - fsc->frextents_delayed);
79 mp->m_sb.sb_frextents = fsc->frextents;
80
81 return 0;
82 }
83
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