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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_format.h"
20 #include "xfs_fs.h"
21 #include "xfs_log_format.h"
22 #include "xfs_trans_resv.h"
23 #include "xfs_mount.h"
24 #include "xfs_error.h"
25 
26 #ifdef DEBUG
27 
28 int	xfs_etest[XFS_NUM_INJECT_ERROR];
29 int64_t	xfs_etest_fsid[XFS_NUM_INJECT_ERROR];
30 char *	xfs_etest_fsname[XFS_NUM_INJECT_ERROR];
31 int	xfs_error_test_active;
32 
33 int
xfs_error_test(int error_tag,int * fsidp,char * expression,int line,char * file,unsigned long randfactor)34 xfs_error_test(int error_tag, int *fsidp, char *expression,
35 	       int line, char *file, unsigned long randfactor)
36 {
37 	int i;
38 	int64_t fsid;
39 
40 	if (prandom_u32() % randfactor)
41 		return 0;
42 
43 	memcpy(&fsid, fsidp, sizeof(xfs_fsid_t));
44 
45 	for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
46 		if (xfs_etest[i] == error_tag && xfs_etest_fsid[i] == fsid) {
47 			xfs_warn(NULL,
48 	"Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
49 				expression, file, line, xfs_etest_fsname[i]);
50 			return 1;
51 		}
52 	}
53 
54 	return 0;
55 }
56 
57 int
xfs_errortag_add(int error_tag,xfs_mount_t * mp)58 xfs_errortag_add(int error_tag, xfs_mount_t *mp)
59 {
60 	int i;
61 	int len;
62 	int64_t fsid;
63 
64 	memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
65 
66 	for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
67 		if (xfs_etest_fsid[i] == fsid && xfs_etest[i] == error_tag) {
68 			xfs_warn(mp, "error tag #%d on", error_tag);
69 			return 0;
70 		}
71 	}
72 
73 	for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
74 		if (xfs_etest[i] == 0) {
75 			xfs_warn(mp, "Turned on XFS error tag #%d",
76 				error_tag);
77 			xfs_etest[i] = error_tag;
78 			xfs_etest_fsid[i] = fsid;
79 			len = strlen(mp->m_fsname);
80 			xfs_etest_fsname[i] = kmem_alloc(len + 1, KM_SLEEP);
81 			strcpy(xfs_etest_fsname[i], mp->m_fsname);
82 			xfs_error_test_active++;
83 			return 0;
84 		}
85 	}
86 
87 	xfs_warn(mp, "error tag overflow, too many turned on");
88 
89 	return 1;
90 }
91 
92 int
xfs_errortag_clearall(xfs_mount_t * mp,int loud)93 xfs_errortag_clearall(xfs_mount_t *mp, int loud)
94 {
95 	int64_t fsid;
96 	int cleared = 0;
97 	int i;
98 
99 	memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
100 
101 
102 	for (i = 0; i < XFS_NUM_INJECT_ERROR; i++) {
103 		if ((fsid == 0LL || xfs_etest_fsid[i] == fsid) &&
104 		     xfs_etest[i] != 0) {
105 			cleared = 1;
106 			xfs_warn(mp, "Clearing XFS error tag #%d",
107 				xfs_etest[i]);
108 			xfs_etest[i] = 0;
109 			xfs_etest_fsid[i] = 0LL;
110 			kmem_free(xfs_etest_fsname[i]);
111 			xfs_etest_fsname[i] = NULL;
112 			xfs_error_test_active--;
113 		}
114 	}
115 
116 	if (loud || cleared)
117 		xfs_warn(mp, "Cleared all XFS error tags for filesystem");
118 
119 	return 0;
120 }
121 #endif /* DEBUG */
122 
123 void
xfs_error_report(const char * tag,int level,struct xfs_mount * mp,const char * filename,int linenum,void * ra)124 xfs_error_report(
125 	const char		*tag,
126 	int			level,
127 	struct xfs_mount	*mp,
128 	const char		*filename,
129 	int			linenum,
130 	void			*ra)
131 {
132 	if (level <= xfs_error_level) {
133 		xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
134 		"Internal error %s at line %d of file %s.  Caller %pS",
135 			    tag, linenum, filename, ra);
136 
137 		xfs_stack_trace();
138 	}
139 }
140 
141 void
xfs_corruption_error(const char * tag,int level,struct xfs_mount * mp,void * p,const char * filename,int linenum,void * ra)142 xfs_corruption_error(
143 	const char		*tag,
144 	int			level,
145 	struct xfs_mount	*mp,
146 	void			*p,
147 	const char		*filename,
148 	int			linenum,
149 	void			*ra)
150 {
151 	if (level <= xfs_error_level)
152 		xfs_hex_dump(p, 64);
153 	xfs_error_report(tag, level, mp, filename, linenum, ra);
154 	xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
155 }
156 
157 /*
158  * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
159  * values, and omit the stack trace unless the error level is tuned high.
160  */
161 void
xfs_verifier_error(struct xfs_buf * bp)162 xfs_verifier_error(
163 	struct xfs_buf		*bp)
164 {
165 	struct xfs_mount *mp = bp->b_target->bt_mount;
166 
167 	xfs_alert(mp, "Metadata %s detected at %pF, %s block 0x%llx",
168 		  bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
169 		  __return_address, bp->b_ops->name, bp->b_bn);
170 
171 	xfs_alert(mp, "Unmount and run xfs_repair");
172 
173 	if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
174 		xfs_alert(mp, "First 64 bytes of corrupted metadata buffer:");
175 		xfs_hex_dump(xfs_buf_offset(bp, 0), 64);
176 	}
177 
178 	if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
179 		xfs_stack_trace();
180 }
181