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Merge tag 'char-misc-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregk...
[linux.git] / fs / xfs / scrub / rtbitmap.c
1 /*
2  * Copyright (C) 2017 Oracle.  All Rights Reserved.
3  *
4  * Author: Darrick J. Wong <[email protected]>
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version 2
9  * of the License, or (at your option) any later version.
10  *
11  * This program is distributed in the hope that it would be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write the Free Software Foundation,
18  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
19  */
20 #include "xfs.h"
21 #include "xfs_fs.h"
22 #include "xfs_shared.h"
23 #include "xfs_format.h"
24 #include "xfs_trans_resv.h"
25 #include "xfs_mount.h"
26 #include "xfs_defer.h"
27 #include "xfs_btree.h"
28 #include "xfs_bit.h"
29 #include "xfs_log_format.h"
30 #include "xfs_trans.h"
31 #include "xfs_sb.h"
32 #include "xfs_alloc.h"
33 #include "xfs_rtalloc.h"
34 #include "xfs_inode.h"
35 #include "scrub/xfs_scrub.h"
36 #include "scrub/scrub.h"
37 #include "scrub/common.h"
38 #include "scrub/trace.h"
39
40 /* Set us up with the realtime metadata locked. */
41 int
42 xfs_scrub_setup_rt(
43         struct xfs_scrub_context        *sc,
44         struct xfs_inode                *ip)
45 {
46         int                             error;
47
48         error = xfs_scrub_setup_fs(sc, ip);
49         if (error)
50                 return error;
51
52         sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP;
53         sc->ip = sc->mp->m_rbmip;
54         xfs_ilock(sc->ip, sc->ilock_flags);
55
56         return 0;
57 }
58
59 /* Realtime bitmap. */
60
61 /* Scrub a free extent record from the realtime bitmap. */
62 STATIC int
63 xfs_scrub_rtbitmap_rec(
64         struct xfs_trans                *tp,
65         struct xfs_rtalloc_rec          *rec,
66         void                            *priv)
67 {
68         struct xfs_scrub_context        *sc = priv;
69         xfs_rtblock_t                   startblock;
70         xfs_rtblock_t                   blockcount;
71
72         startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize;
73         blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize;
74
75         if (startblock + blockcount <= startblock ||
76             !xfs_verify_rtbno(sc->mp, startblock) ||
77             !xfs_verify_rtbno(sc->mp, startblock + blockcount - 1))
78                 xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
79         return 0;
80 }
81
82 /* Scrub the realtime bitmap. */
83 int
84 xfs_scrub_rtbitmap(
85         struct xfs_scrub_context        *sc)
86 {
87         int                             error;
88
89         /* Invoke the fork scrubber. */
90         error = xfs_scrub_metadata_inode_forks(sc);
91         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
92                 return error;
93
94         error = xfs_rtalloc_query_all(sc->tp, xfs_scrub_rtbitmap_rec, sc);
95         if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
96                 goto out;
97
98 out:
99         return error;
100 }
101
102 /* Scrub the realtime summary. */
103 int
104 xfs_scrub_rtsummary(
105         struct xfs_scrub_context        *sc)
106 {
107         struct xfs_inode                *rsumip = sc->mp->m_rsumip;
108         struct xfs_inode                *old_ip = sc->ip;
109         uint                            old_ilock_flags = sc->ilock_flags;
110         int                             error = 0;
111
112         /*
113          * We ILOCK'd the rt bitmap ip in the setup routine, now lock the
114          * rt summary ip in compliance with the rt inode locking rules.
115          *
116          * Since we switch sc->ip to rsumip we have to save the old ilock
117          * flags so that we don't mix up the inode state that @sc tracks.
118          */
119         sc->ip = rsumip;
120         sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
121         xfs_ilock(sc->ip, sc->ilock_flags);
122
123         /* Invoke the fork scrubber. */
124         error = xfs_scrub_metadata_inode_forks(sc);
125         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
126                 goto out;
127
128         /* XXX: implement this some day */
129         xfs_scrub_set_incomplete(sc);
130 out:
131         /* Switch back to the rtbitmap inode and lock flags. */
132         xfs_iunlock(sc->ip, sc->ilock_flags);
133         sc->ilock_flags = old_ilock_flags;
134         sc->ip = old_ip;
135         return error;
136 }
137
138
139 /* xref check that the extent is not free in the rtbitmap */
140 void
141 xfs_scrub_xref_is_used_rt_space(
142         struct xfs_scrub_context        *sc,
143         xfs_rtblock_t                   fsbno,
144         xfs_extlen_t                    len)
145 {
146         xfs_rtblock_t                   startext;
147         xfs_rtblock_t                   endext;
148         xfs_rtblock_t                   extcount;
149         bool                            is_free;
150         int                             error;
151
152         if (xfs_scrub_skip_xref(sc->sm))
153                 return;
154
155         startext = fsbno;
156         endext = fsbno + len - 1;
157         do_div(startext, sc->mp->m_sb.sb_rextsize);
158         if (do_div(endext, sc->mp->m_sb.sb_rextsize))
159                 endext++;
160         extcount = endext - startext;
161         xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
162         error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
163                         &is_free);
164         if (!xfs_scrub_should_check_xref(sc, &error, NULL))
165                 goto out_unlock;
166         if (is_free)
167                 xfs_scrub_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
168 out_unlock:
169         xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
170 }
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