xfs: prevent NMI timeouts in cmn_err
[pandora-kernel.git] / fs / xfs / xfs_error.c
1 /*
2  * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_log.h"
22 #include "xfs_inum.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_mount.h"
27 #include "xfs_bmap_btree.h"
28 #include "xfs_dinode.h"
29 #include "xfs_inode.h"
30 #include "xfs_utils.h"
31 #include "xfs_error.h"
32
33 #ifdef DEBUG
34
35 int     xfs_etrap[XFS_ERROR_NTRAP] = {
36         0,
37 };
38
39 int
40 xfs_error_trap(int e)
41 {
42         int i;
43
44         if (!e)
45                 return 0;
46         for (i = 0; i < XFS_ERROR_NTRAP; i++) {
47                 if (xfs_etrap[i] == 0)
48                         break;
49                 if (e != xfs_etrap[i])
50                         continue;
51                 cmn_err(CE_NOTE, "xfs_error_trap: error %d", e);
52                 BUG();
53                 break;
54         }
55         return e;
56 }
57
58 int     xfs_etest[XFS_NUM_INJECT_ERROR];
59 int64_t xfs_etest_fsid[XFS_NUM_INJECT_ERROR];
60 char *  xfs_etest_fsname[XFS_NUM_INJECT_ERROR];
61 int     xfs_error_test_active;
62
63 int
64 xfs_error_test(int error_tag, int *fsidp, char *expression,
65                int line, char *file, unsigned long randfactor)
66 {
67         int i;
68         int64_t fsid;
69
70         if (random32() % randfactor)
71                 return 0;
72
73         memcpy(&fsid, fsidp, sizeof(xfs_fsid_t));
74
75         for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
76                 if (xfs_etest[i] == error_tag && xfs_etest_fsid[i] == fsid) {
77                         cmn_err(CE_WARN,
78         "Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
79                                 expression, file, line, xfs_etest_fsname[i]);
80                         return 1;
81                 }
82         }
83
84         return 0;
85 }
86
87 int
88 xfs_errortag_add(int error_tag, xfs_mount_t *mp)
89 {
90         int i;
91         int len;
92         int64_t fsid;
93
94         memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
95
96         for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
97                 if (xfs_etest_fsid[i] == fsid && xfs_etest[i] == error_tag) {
98                         cmn_err(CE_WARN, "XFS error tag #%d on", error_tag);
99                         return 0;
100                 }
101         }
102
103         for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
104                 if (xfs_etest[i] == 0) {
105                         cmn_err(CE_WARN, "Turned on XFS error tag #%d",
106                                 error_tag);
107                         xfs_etest[i] = error_tag;
108                         xfs_etest_fsid[i] = fsid;
109                         len = strlen(mp->m_fsname);
110                         xfs_etest_fsname[i] = kmem_alloc(len + 1, KM_SLEEP);
111                         strcpy(xfs_etest_fsname[i], mp->m_fsname);
112                         xfs_error_test_active++;
113                         return 0;
114                 }
115         }
116
117         cmn_err(CE_WARN, "error tag overflow, too many turned on");
118
119         return 1;
120 }
121
122 int
123 xfs_errortag_clearall(xfs_mount_t *mp, int loud)
124 {
125         int64_t fsid;
126         int cleared = 0;
127         int i;
128
129         memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
130
131
132         for (i = 0; i < XFS_NUM_INJECT_ERROR; i++) {
133                 if ((fsid == 0LL || xfs_etest_fsid[i] == fsid) &&
134                      xfs_etest[i] != 0) {
135                         cleared = 1;
136                         cmn_err(CE_WARN, "Clearing XFS error tag #%d",
137                                 xfs_etest[i]);
138                         xfs_etest[i] = 0;
139                         xfs_etest_fsid[i] = 0LL;
140                         kmem_free(xfs_etest_fsname[i]);
141                         xfs_etest_fsname[i] = NULL;
142                         xfs_error_test_active--;
143                 }
144         }
145
146         if (loud || cleared)
147                 cmn_err(CE_WARN,
148                         "Cleared all XFS error tags for filesystem \"%s\"",
149                         mp->m_fsname);
150
151         return 0;
152 }
153 #endif /* DEBUG */
154
155 void
156 xfs_error_report(
157         const char              *tag,
158         int                     level,
159         struct xfs_mount        *mp,
160         const char              *filename,
161         int                     linenum,
162         inst_t                  *ra)
163 {
164         if (level <= xfs_error_level) {
165                 xfs_cmn_err(XFS_PTAG_ERROR_REPORT,
166                             CE_ALERT, mp,
167                 "XFS internal error %s at line %d of file %s.  Caller 0x%p\n",
168                             tag, linenum, filename, ra);
169
170                 xfs_stack_trace();
171         }
172 }
173
174 void
175 xfs_corruption_error(
176         const char              *tag,
177         int                     level,
178         struct xfs_mount        *mp,
179         void                    *p,
180         const char              *filename,
181         int                     linenum,
182         inst_t                  *ra)
183 {
184         if (level <= xfs_error_level)
185                 xfs_hex_dump(p, 16);
186         xfs_error_report(tag, level, mp, filename, linenum, ra);
187 }