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_rtalloc.h"
20 #include "xfs_inode.h"
21 #include "scrub/xfs_scrub.h"
22 #include "scrub/scrub.h"
23 #include "scrub/common.h"
24 #include "scrub/trace.h"
25
26 /* Set us up with the realtime metadata locked. */
27 int
xchk_setup_rt(struct xfs_scrub * sc,struct xfs_inode * ip)28 xchk_setup_rt(
29 struct xfs_scrub *sc,
30 struct xfs_inode *ip)
31 {
32 int error;
33
34 error = xchk_setup_fs(sc, ip);
35 if (error)
36 return error;
37
38 sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP;
39 sc->ip = sc->mp->m_rbmip;
40 xfs_ilock(sc->ip, sc->ilock_flags);
41
42 return 0;
43 }
44
45 /* Realtime bitmap. */
46
47 /* Scrub a free extent record from the realtime bitmap. */
48 STATIC int
xchk_rtbitmap_rec(struct xfs_trans * tp,struct xfs_rtalloc_rec * rec,void * priv)49 xchk_rtbitmap_rec(
50 struct xfs_trans *tp,
51 struct xfs_rtalloc_rec *rec,
52 void *priv)
53 {
54 struct xfs_scrub *sc = priv;
55 xfs_rtblock_t startblock;
56 xfs_rtblock_t blockcount;
57
58 startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize;
59 blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize;
60
61 if (startblock + blockcount <= startblock ||
62 !xfs_verify_rtbno(sc->mp, startblock) ||
63 !xfs_verify_rtbno(sc->mp, startblock + blockcount - 1))
64 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
65 return 0;
66 }
67
68 /* Scrub the realtime bitmap. */
69 int
xchk_rtbitmap(struct xfs_scrub * sc)70 xchk_rtbitmap(
71 struct xfs_scrub *sc)
72 {
73 int error;
74
75 /* Invoke the fork scrubber. */
76 error = xchk_metadata_inode_forks(sc);
77 if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
78 return error;
79
80 error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc);
81 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
82 goto out;
83
84 out:
85 return error;
86 }
87
88 /* Scrub the realtime summary. */
89 int
xchk_rtsummary(struct xfs_scrub * sc)90 xchk_rtsummary(
91 struct xfs_scrub *sc)
92 {
93 struct xfs_inode *rsumip = sc->mp->m_rsumip;
94 struct xfs_inode *old_ip = sc->ip;
95 uint old_ilock_flags = sc->ilock_flags;
96 int error = 0;
97
98 /*
99 * We ILOCK'd the rt bitmap ip in the setup routine, now lock the
100 * rt summary ip in compliance with the rt inode locking rules.
101 *
102 * Since we switch sc->ip to rsumip we have to save the old ilock
103 * flags so that we don't mix up the inode state that @sc tracks.
104 */
105 sc->ip = rsumip;
106 sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
107 xfs_ilock(sc->ip, sc->ilock_flags);
108
109 /* Invoke the fork scrubber. */
110 error = xchk_metadata_inode_forks(sc);
111 if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
112 goto out;
113
114 /* XXX: implement this some day */
115 xchk_set_incomplete(sc);
116 out:
117 /* Switch back to the rtbitmap inode and lock flags. */
118 xfs_iunlock(sc->ip, sc->ilock_flags);
119 sc->ilock_flags = old_ilock_flags;
120 sc->ip = old_ip;
121 return error;
122 }
123
124
125 /* xref check that the extent is not free in the rtbitmap */
126 void
xchk_xref_is_used_rt_space(struct xfs_scrub * sc,xfs_rtblock_t fsbno,xfs_extlen_t len)127 xchk_xref_is_used_rt_space(
128 struct xfs_scrub *sc,
129 xfs_rtblock_t fsbno,
130 xfs_extlen_t len)
131 {
132 xfs_rtblock_t startext;
133 xfs_rtblock_t endext;
134 xfs_rtblock_t extcount;
135 bool is_free;
136 int error;
137
138 if (xchk_skip_xref(sc->sm))
139 return;
140
141 startext = fsbno;
142 endext = fsbno + len - 1;
143 do_div(startext, sc->mp->m_sb.sb_rextsize);
144 if (do_div(endext, sc->mp->m_sb.sb_rextsize))
145 endext++;
146 extcount = endext - startext;
147 xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
148 error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
149 &is_free);
150 if (!xchk_should_check_xref(sc, &error, NULL))
151 goto out_unlock;
152 if (is_free)
153 xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
154 out_unlock:
155 xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
156 }
157