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
xfs_error_trap(int e)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 		xfs_notice(NULL, "%s: error %d", __func__, 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
xfs_error_test(int error_tag,int * fsidp,char * expression,int line,char * file,unsigned long randfactor)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 			xfs_warn(NULL,
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
xfs_errortag_add(int error_tag,xfs_mount_t * mp)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 			xfs_warn(mp, "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 			xfs_warn(mp, "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 	xfs_warn(mp, "error tag overflow, too many turned on");
118 
119 	return 1;
120 }
121 
122 int
xfs_errortag_clearall(xfs_mount_t * mp,int loud)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 			xfs_warn(mp, "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 		xfs_warn(mp, "Cleared all XFS error tags for filesystem");
148 
149 	return 0;
150 }
151 #endif /* DEBUG */
152 
153 void
xfs_error_report(const char * tag,int level,struct xfs_mount * mp,const char * filename,int linenum,inst_t * ra)154 xfs_error_report(
155 	const char		*tag,
156 	int			level,
157 	struct xfs_mount	*mp,
158 	const char		*filename,
159 	int			linenum,
160 	inst_t			*ra)
161 {
162 	if (level <= xfs_error_level) {
163 		xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
164 		"Internal error %s at line %d of file %s.  Caller 0x%p\n",
165 			    tag, linenum, filename, ra);
166 
167 		xfs_stack_trace();
168 	}
169 }
170 
171 void
xfs_corruption_error(const char * tag,int level,struct xfs_mount * mp,void * p,const char * filename,int linenum,inst_t * ra)172 xfs_corruption_error(
173 	const char		*tag,
174 	int			level,
175 	struct xfs_mount	*mp,
176 	void			*p,
177 	const char		*filename,
178 	int			linenum,
179 	inst_t			*ra)
180 {
181 	if (level <= xfs_error_level)
182 		xfs_hex_dump(p, 16);
183 	xfs_error_report(tag, level, mp, filename, linenum, ra);
184 	xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
185 }
186