1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2020-2024 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_btree.h"
13#include "xfs_log_format.h"
14#include "xfs_trans.h"
15#include "xfs_rtalloc.h"
16#include "xfs_inode.h"
17#include "xfs_bit.h"
18#include "xfs_bmap.h"
19#include "xfs_bmap_btree.h"
20#include "xfs_exchmaps.h"
21#include "xfs_rtbitmap.h"
22#include "scrub/scrub.h"
23#include "scrub/common.h"
24#include "scrub/trace.h"
25#include "scrub/repair.h"
26#include "scrub/tempfile.h"
27#include "scrub/tempexch.h"
28#include "scrub/reap.h"
29#include "scrub/xfile.h"
30#include "scrub/rtsummary.h"
31
32/* Set us up to repair the rtsummary file. */
33int
34xrep_setup_rtsummary(
35 struct xfs_scrub *sc,
36 struct xchk_rtsummary *rts)
37{
38 struct xfs_mount *mp = sc->mp;
39 unsigned long long blocks;
40 int error;
41
42 error = xrep_tempfile_create(sc, S_IFREG);
43 if (error)
44 return error;
45
46 /*
47 * If we're doing a repair, we reserve enough blocks to write out a
48 * completely new summary file, plus twice as many blocks as we would
49 * need if we can only allocate one block per data fork mapping. This
50 * should cover the preallocation of the temporary file and exchanging
51 * the extent mappings.
52 *
53 * We cannot use xfs_exchmaps_estimate because we have not yet
54 * constructed the replacement rtsummary and therefore do not know how
55 * many extents it will use. By the time we do, we will have a dirty
56 * transaction (which we cannot drop because we cannot drop the
57 * rtsummary ILOCK) and cannot ask for more reservation.
58 */
59 blocks = mp->m_rsumblocks;
60 blocks += xfs_bmbt_calc_size(mp, blocks) * 2;
61 if (blocks > UINT_MAX)
62 return -EOPNOTSUPP;
63
64 rts->resblks += blocks;
65 return 0;
66}
67
68static int
69xrep_rtsummary_prep_buf(
70 struct xfs_scrub *sc,
71 struct xfs_buf *bp,
72 void *data)
73{
74 struct xchk_rtsummary *rts = data;
75 struct xfs_mount *mp = sc->mp;
76 union xfs_suminfo_raw *ondisk;
77 int error;
78
79 rts->args.mp = mp;
80 rts->args.tp = sc->tp;
81 rts->args.rtg = sc->sr.rtg;
82 rts->args.sumbp = bp;
83 ondisk = xfs_rsumblock_infoptr(&rts->args, 0);
84 rts->args.sumbp = NULL;
85
86 error = xfsum_copyout(sc, rts->prep_wordoff, ondisk, mp->m_blockwsize);
87 if (error)
88 return error;
89
90 if (xfs_has_rtgroups(sc->mp)) {
91 struct xfs_rtbuf_blkinfo *hdr = bp->b_addr;
92
93 hdr->rt_magic = cpu_to_be32(XFS_RTSUMMARY_MAGIC);
94 hdr->rt_owner = cpu_to_be64(sc->ip->i_ino);
95 hdr->rt_blkno = cpu_to_be64(xfs_buf_daddr(bp));
96 hdr->rt_lsn = 0;
97 uuid_copy(&hdr->rt_uuid, &sc->mp->m_sb.sb_meta_uuid);
98 bp->b_ops = &xfs_rtsummary_buf_ops;
99 } else {
100 bp->b_ops = &xfs_rtbuf_ops;
101 }
102
103 rts->prep_wordoff += mp->m_blockwsize;
104 xfs_trans_buf_set_type(sc->tp, bp, XFS_BLFT_RTSUMMARY_BUF);
105 return 0;
106}
107
108/* Repair the realtime summary. */
109int
110xrep_rtsummary(
111 struct xfs_scrub *sc)
112{
113 struct xchk_rtsummary *rts = sc->buf;
114 struct xfs_mount *mp = sc->mp;
115 int error;
116
117 /* We require the rmapbt to rebuild anything. */
118 if (!xfs_has_rmapbt(mp))
119 return -EOPNOTSUPP;
120 /* We require atomic file exchange range to rebuild anything. */
121 if (!xfs_has_exchange_range(mp))
122 return -EOPNOTSUPP;
123
124 /* Walk away if we disagree on the size of the rt bitmap. */
125 if (rts->rbmblocks != mp->m_sb.sb_rbmblocks)
126 return 0;
127
128 /* Make sure any problems with the fork are fixed. */
129 error = xrep_metadata_inode_forks(sc);
130 if (error)
131 return error;
132
133 /*
134 * Try to take ILOCK_EXCL of the temporary file. We had better be the
135 * only ones holding onto this inode, but we can't block while holding
136 * the rtsummary file's ILOCK_EXCL.
137 */
138 while (!xrep_tempfile_ilock_nowait(sc)) {
139 if (xchk_should_terminate(sc, &error))
140 return error;
141 delay(1);
142 }
143
144 /* Make sure we have space allocated for the entire summary file. */
145 xfs_trans_ijoin(sc->tp, sc->ip, 0);
146 xfs_trans_ijoin(sc->tp, sc->tempip, 0);
147 error = xrep_tempfile_prealloc(sc, 0, rts->rsumblocks);
148 if (error)
149 return error;
150
151 /* Last chance to abort before we start committing fixes. */
152 if (xchk_should_terminate(sc, &error))
153 return error;
154
155 /* Copy the rtsummary file that we generated. */
156 error = xrep_tempfile_copyin(sc, 0, rts->rsumblocks,
157 xrep_rtsummary_prep_buf, rts);
158 if (error)
159 return error;
160 error = xrep_tempfile_set_isize(sc, XFS_FSB_TO_B(mp, rts->rsumblocks));
161 if (error)
162 return error;
163
164 /*
165 * Now exchange the contents. Nothing in repair uses the temporary
166 * buffer, so we can reuse it for the tempfile exchrange information.
167 */
168 error = xrep_tempexch_trans_reserve(sc, XFS_DATA_FORK, 0,
169 rts->rsumblocks, &rts->tempexch);
170 if (error)
171 return error;
172
173 error = xrep_tempexch_contents(sc, &rts->tempexch);
174 if (error)
175 return error;
176
177 /* Reset incore state and blow out the summary cache. */
178 if (sc->sr.rtg->rtg_rsum_cache)
179 memset(sc->sr.rtg->rtg_rsum_cache, 0xFF, mp->m_sb.sb_rbmblocks);
180
181 mp->m_rsumlevels = rts->rsumlevels;
182 mp->m_rsumblocks = rts->rsumblocks;
183
184 /* Free the old rtsummary blocks if they're not in use. */
185 return xrep_reap_ifork(sc, sc->tempip, XFS_DATA_FORK);
186}
187

source code of linux/fs/xfs/scrub/rtsummary_repair.c