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TOMOYO Linux Cross Reference
Linux/fs/xfs/xfs_error.c

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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 #include "xfs_sysfs.h"
 26 
 27 #ifdef DEBUG
 28 
 29 static unsigned int xfs_errortag_random_default[] = {
 30         XFS_RANDOM_DEFAULT,
 31         XFS_RANDOM_IFLUSH_1,
 32         XFS_RANDOM_IFLUSH_2,
 33         XFS_RANDOM_IFLUSH_3,
 34         XFS_RANDOM_IFLUSH_4,
 35         XFS_RANDOM_IFLUSH_5,
 36         XFS_RANDOM_IFLUSH_6,
 37         XFS_RANDOM_DA_READ_BUF,
 38         XFS_RANDOM_BTREE_CHECK_LBLOCK,
 39         XFS_RANDOM_BTREE_CHECK_SBLOCK,
 40         XFS_RANDOM_ALLOC_READ_AGF,
 41         XFS_RANDOM_IALLOC_READ_AGI,
 42         XFS_RANDOM_ITOBP_INOTOBP,
 43         XFS_RANDOM_IUNLINK,
 44         XFS_RANDOM_IUNLINK_REMOVE,
 45         XFS_RANDOM_DIR_INO_VALIDATE,
 46         XFS_RANDOM_BULKSTAT_READ_CHUNK,
 47         XFS_RANDOM_IODONE_IOERR,
 48         XFS_RANDOM_STRATREAD_IOERR,
 49         XFS_RANDOM_STRATCMPL_IOERR,
 50         XFS_RANDOM_DIOWRITE_IOERR,
 51         XFS_RANDOM_BMAPIFORMAT,
 52         XFS_RANDOM_FREE_EXTENT,
 53         XFS_RANDOM_RMAP_FINISH_ONE,
 54         XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE,
 55         XFS_RANDOM_REFCOUNT_FINISH_ONE,
 56         XFS_RANDOM_BMAP_FINISH_ONE,
 57         XFS_RANDOM_AG_RESV_CRITICAL,
 58         XFS_RANDOM_DROP_WRITES,
 59         XFS_RANDOM_LOG_BAD_CRC,
 60 };
 61 
 62 struct xfs_errortag_attr {
 63         struct attribute        attr;
 64         unsigned int            tag;
 65 };
 66 
 67 static inline struct xfs_errortag_attr *
 68 to_attr(struct attribute *attr)
 69 {
 70         return container_of(attr, struct xfs_errortag_attr, attr);
 71 }
 72 
 73 static inline struct xfs_mount *
 74 to_mp(struct kobject *kobject)
 75 {
 76         struct xfs_kobj *kobj = to_kobj(kobject);
 77 
 78         return container_of(kobj, struct xfs_mount, m_errortag_kobj);
 79 }
 80 
 81 STATIC ssize_t
 82 xfs_errortag_attr_store(
 83         struct kobject          *kobject,
 84         struct attribute        *attr,
 85         const char              *buf,
 86         size_t                  count)
 87 {
 88         struct xfs_mount        *mp = to_mp(kobject);
 89         struct xfs_errortag_attr *xfs_attr = to_attr(attr);
 90         int                     ret;
 91         unsigned int            val;
 92 
 93         if (strcmp(buf, "default") == 0) {
 94                 val = xfs_errortag_random_default[xfs_attr->tag];
 95         } else {
 96                 ret = kstrtouint(buf, 0, &val);
 97                 if (ret)
 98                         return ret;
 99         }
100 
101         ret = xfs_errortag_set(mp, xfs_attr->tag, val);
102         if (ret)
103                 return ret;
104         return count;
105 }
106 
107 STATIC ssize_t
108 xfs_errortag_attr_show(
109         struct kobject          *kobject,
110         struct attribute        *attr,
111         char                    *buf)
112 {
113         struct xfs_mount        *mp = to_mp(kobject);
114         struct xfs_errortag_attr *xfs_attr = to_attr(attr);
115 
116         return snprintf(buf, PAGE_SIZE, "%u\n",
117                         xfs_errortag_get(mp, xfs_attr->tag));
118 }
119 
120 static const struct sysfs_ops xfs_errortag_sysfs_ops = {
121         .show = xfs_errortag_attr_show,
122         .store = xfs_errortag_attr_store,
123 };
124 
125 #define XFS_ERRORTAG_ATTR_RW(_name, _tag) \
126 static struct xfs_errortag_attr xfs_errortag_attr_##_name = {           \
127         .attr = {.name = __stringify(_name),                            \
128                  .mode = VERIFY_OCTAL_PERMISSIONS(S_IWUSR | S_IRUGO) }, \
129         .tag    = (_tag),                                               \
130 }
131 
132 #define XFS_ERRORTAG_ATTR_LIST(_name) &xfs_errortag_attr_##_name.attr
133 
134 XFS_ERRORTAG_ATTR_RW(noerror,           XFS_ERRTAG_NOERROR);
135 XFS_ERRORTAG_ATTR_RW(iflush1,           XFS_ERRTAG_IFLUSH_1);
136 XFS_ERRORTAG_ATTR_RW(iflush2,           XFS_ERRTAG_IFLUSH_2);
137 XFS_ERRORTAG_ATTR_RW(iflush3,           XFS_ERRTAG_IFLUSH_3);
138 XFS_ERRORTAG_ATTR_RW(iflush4,           XFS_ERRTAG_IFLUSH_4);
139 XFS_ERRORTAG_ATTR_RW(iflush5,           XFS_ERRTAG_IFLUSH_5);
140 XFS_ERRORTAG_ATTR_RW(iflush6,           XFS_ERRTAG_IFLUSH_6);
141 XFS_ERRORTAG_ATTR_RW(dareadbuf,         XFS_ERRTAG_DA_READ_BUF);
142 XFS_ERRORTAG_ATTR_RW(btree_chk_lblk,    XFS_ERRTAG_BTREE_CHECK_LBLOCK);
143 XFS_ERRORTAG_ATTR_RW(btree_chk_sblk,    XFS_ERRTAG_BTREE_CHECK_SBLOCK);
144 XFS_ERRORTAG_ATTR_RW(readagf,           XFS_ERRTAG_ALLOC_READ_AGF);
145 XFS_ERRORTAG_ATTR_RW(readagi,           XFS_ERRTAG_IALLOC_READ_AGI);
146 XFS_ERRORTAG_ATTR_RW(itobp,             XFS_ERRTAG_ITOBP_INOTOBP);
147 XFS_ERRORTAG_ATTR_RW(iunlink,           XFS_ERRTAG_IUNLINK);
148 XFS_ERRORTAG_ATTR_RW(iunlinkrm,         XFS_ERRTAG_IUNLINK_REMOVE);
149 XFS_ERRORTAG_ATTR_RW(dirinovalid,       XFS_ERRTAG_DIR_INO_VALIDATE);
150 XFS_ERRORTAG_ATTR_RW(bulkstat,          XFS_ERRTAG_BULKSTAT_READ_CHUNK);
151 XFS_ERRORTAG_ATTR_RW(logiodone,         XFS_ERRTAG_IODONE_IOERR);
152 XFS_ERRORTAG_ATTR_RW(stratread,         XFS_ERRTAG_STRATREAD_IOERR);
153 XFS_ERRORTAG_ATTR_RW(stratcmpl,         XFS_ERRTAG_STRATCMPL_IOERR);
154 XFS_ERRORTAG_ATTR_RW(diowrite,          XFS_ERRTAG_DIOWRITE_IOERR);
155 XFS_ERRORTAG_ATTR_RW(bmapifmt,          XFS_ERRTAG_BMAPIFORMAT);
156 XFS_ERRORTAG_ATTR_RW(free_extent,       XFS_ERRTAG_FREE_EXTENT);
157 XFS_ERRORTAG_ATTR_RW(rmap_finish_one,   XFS_ERRTAG_RMAP_FINISH_ONE);
158 XFS_ERRORTAG_ATTR_RW(refcount_continue_update,  XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE);
159 XFS_ERRORTAG_ATTR_RW(refcount_finish_one,       XFS_ERRTAG_REFCOUNT_FINISH_ONE);
160 XFS_ERRORTAG_ATTR_RW(bmap_finish_one,   XFS_ERRTAG_BMAP_FINISH_ONE);
161 XFS_ERRORTAG_ATTR_RW(ag_resv_critical,  XFS_ERRTAG_AG_RESV_CRITICAL);
162 XFS_ERRORTAG_ATTR_RW(drop_writes,       XFS_ERRTAG_DROP_WRITES);
163 XFS_ERRORTAG_ATTR_RW(log_bad_crc,       XFS_ERRTAG_LOG_BAD_CRC);
164 
165 static struct attribute *xfs_errortag_attrs[] = {
166         XFS_ERRORTAG_ATTR_LIST(noerror),
167         XFS_ERRORTAG_ATTR_LIST(iflush1),
168         XFS_ERRORTAG_ATTR_LIST(iflush2),
169         XFS_ERRORTAG_ATTR_LIST(iflush3),
170         XFS_ERRORTAG_ATTR_LIST(iflush4),
171         XFS_ERRORTAG_ATTR_LIST(iflush5),
172         XFS_ERRORTAG_ATTR_LIST(iflush6),
173         XFS_ERRORTAG_ATTR_LIST(dareadbuf),
174         XFS_ERRORTAG_ATTR_LIST(btree_chk_lblk),
175         XFS_ERRORTAG_ATTR_LIST(btree_chk_sblk),
176         XFS_ERRORTAG_ATTR_LIST(readagf),
177         XFS_ERRORTAG_ATTR_LIST(readagi),
178         XFS_ERRORTAG_ATTR_LIST(itobp),
179         XFS_ERRORTAG_ATTR_LIST(iunlink),
180         XFS_ERRORTAG_ATTR_LIST(iunlinkrm),
181         XFS_ERRORTAG_ATTR_LIST(dirinovalid),
182         XFS_ERRORTAG_ATTR_LIST(bulkstat),
183         XFS_ERRORTAG_ATTR_LIST(logiodone),
184         XFS_ERRORTAG_ATTR_LIST(stratread),
185         XFS_ERRORTAG_ATTR_LIST(stratcmpl),
186         XFS_ERRORTAG_ATTR_LIST(diowrite),
187         XFS_ERRORTAG_ATTR_LIST(bmapifmt),
188         XFS_ERRORTAG_ATTR_LIST(free_extent),
189         XFS_ERRORTAG_ATTR_LIST(rmap_finish_one),
190         XFS_ERRORTAG_ATTR_LIST(refcount_continue_update),
191         XFS_ERRORTAG_ATTR_LIST(refcount_finish_one),
192         XFS_ERRORTAG_ATTR_LIST(bmap_finish_one),
193         XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
194         XFS_ERRORTAG_ATTR_LIST(drop_writes),
195         XFS_ERRORTAG_ATTR_LIST(log_bad_crc),
196         NULL,
197 };
198 
199 struct kobj_type xfs_errortag_ktype = {
200         .release = xfs_sysfs_release,
201         .sysfs_ops = &xfs_errortag_sysfs_ops,
202         .default_attrs = xfs_errortag_attrs,
203 };
204 
205 int
206 xfs_errortag_init(
207         struct xfs_mount        *mp)
208 {
209         mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
210                         KM_SLEEP | KM_MAYFAIL);
211         if (!mp->m_errortag)
212                 return -ENOMEM;
213 
214         return xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
215                                &mp->m_kobj, "errortag");
216 }
217 
218 void
219 xfs_errortag_del(
220         struct xfs_mount        *mp)
221 {
222         xfs_sysfs_del(&mp->m_errortag_kobj);
223         kmem_free(mp->m_errortag);
224 }
225 
226 bool
227 xfs_errortag_test(
228         struct xfs_mount        *mp,
229         const char              *expression,
230         const char              *file,
231         int                     line,
232         unsigned int            error_tag)
233 {
234         unsigned int            randfactor;
235 
236         /*
237          * To be able to use error injection anywhere, we need to ensure error
238          * injection mechanism is already initialized.
239          *
240          * Code paths like I/O completion can be called before the
241          * initialization is complete, but be able to inject errors in such
242          * places is still useful.
243          */
244         if (!mp->m_errortag)
245                 return false;
246 
247         ASSERT(error_tag < XFS_ERRTAG_MAX);
248         randfactor = mp->m_errortag[error_tag];
249         if (!randfactor || prandom_u32() % randfactor)
250                 return false;
251 
252         xfs_warn_ratelimited(mp,
253 "Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
254                         expression, file, line, mp->m_fsname);
255         return true;
256 }
257 
258 int
259 xfs_errortag_get(
260         struct xfs_mount        *mp,
261         unsigned int            error_tag)
262 {
263         if (error_tag >= XFS_ERRTAG_MAX)
264                 return -EINVAL;
265 
266         return mp->m_errortag[error_tag];
267 }
268 
269 int
270 xfs_errortag_set(
271         struct xfs_mount        *mp,
272         unsigned int            error_tag,
273         unsigned int            tag_value)
274 {
275         if (error_tag >= XFS_ERRTAG_MAX)
276                 return -EINVAL;
277 
278         mp->m_errortag[error_tag] = tag_value;
279         return 0;
280 }
281 
282 int
283 xfs_errortag_add(
284         struct xfs_mount        *mp,
285         unsigned int            error_tag)
286 {
287         if (error_tag >= XFS_ERRTAG_MAX)
288                 return -EINVAL;
289 
290         return xfs_errortag_set(mp, error_tag,
291                         xfs_errortag_random_default[error_tag]);
292 }
293 
294 int
295 xfs_errortag_clearall(
296         struct xfs_mount        *mp)
297 {
298         memset(mp->m_errortag, 0, sizeof(unsigned int) * XFS_ERRTAG_MAX);
299         return 0;
300 }
301 #endif /* DEBUG */
302 
303 void
304 xfs_error_report(
305         const char              *tag,
306         int                     level,
307         struct xfs_mount        *mp,
308         const char              *filename,
309         int                     linenum,
310         void                    *ra)
311 {
312         if (level <= xfs_error_level) {
313                 xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
314                 "Internal error %s at line %d of file %s.  Caller %pS",
315                             tag, linenum, filename, ra);
316 
317                 xfs_stack_trace();
318         }
319 }
320 
321 void
322 xfs_corruption_error(
323         const char              *tag,
324         int                     level,
325         struct xfs_mount        *mp,
326         void                    *p,
327         const char              *filename,
328         int                     linenum,
329         void                    *ra)
330 {
331         if (level <= xfs_error_level)
332                 xfs_hex_dump(p, 64);
333         xfs_error_report(tag, level, mp, filename, linenum, ra);
334         xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
335 }
336 
337 /*
338  * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
339  * values, and omit the stack trace unless the error level is tuned high.
340  */
341 void
342 xfs_verifier_error(
343         struct xfs_buf          *bp)
344 {
345         struct xfs_mount *mp = bp->b_target->bt_mount;
346 
347         xfs_alert(mp, "Metadata %s detected at %pS, %s block 0x%llx",
348                   bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
349                   __return_address, bp->b_ops->name, bp->b_bn);
350 
351         xfs_alert(mp, "Unmount and run xfs_repair");
352 
353         if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
354                 xfs_alert(mp, "First 64 bytes of corrupted metadata buffer:");
355                 xfs_hex_dump(xfs_buf_offset(bp, 0), 64);
356         }
357 
358         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
359                 xfs_stack_trace();
360 }
361 

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