1 // SPDX-License-Identifier: GPL-2.0
2 #include "bcachefs.h"
3 #include "btree_iter.h"
4 #include "error.h"
5 #include "journal.h"
6 #include "recovery_passes.h"
7 #include "super.h"
8 #include "thread_with_file.h"
9
10 #define FSCK_ERR_RATELIMIT_NR 10
11
12 bool bch2_inconsistent_error(struct bch_fs *c)
13 {
14 set_bit(BCH_FS_error, &c->flags);
15
16 switch (c->opts.errors) {
17 case BCH_ON_ERROR_continue:
18 return false;
19 case BCH_ON_ERROR_fix_safe:
20 case BCH_ON_ERROR_ro:
21 if (bch2_fs_emergency_read_only(c))
22 bch_err(c, "inconsistency detected - emergency read only at journal seq %llu",
23 journal_cur_seq(&c->journal));
24 return true;
25 case BCH_ON_ERROR_panic:
26 panic(bch2_fmt(c, "panic after error"));
27 return true;
28 default:
29 BUG();
30 }
31 }
32
33 int bch2_topology_error(struct bch_fs *c)
34 {
35 set_bit(BCH_FS_topology_error, &c->flags);
36 if (!test_bit(BCH_FS_fsck_running, &c->flags)) {
37 bch2_inconsistent_error(c);
38 return -BCH_ERR_btree_need_topology_repair;
39 } else {
40 return bch2_run_explicit_recovery_pass(c, BCH_RECOVERY_PASS_check_topology) ?:
41 -BCH_ERR_btree_node_read_validate_error;
42 }
43 }
44
45 void bch2_fatal_error(struct bch_fs *c)
46 {
47 if (bch2_fs_emergency_read_only(c))
48 bch_err(c, "fatal error - emergency read only");
49 }
50
51 void bch2_io_error_work(struct work_struct *work)
52 {
53 struct bch_dev *ca = container_of(work, struct bch_dev, io_error_work);
54 struct bch_fs *c = ca->fs;
55 bool dev;
56
57 down_write(&c->state_lock);
58 dev = bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_ro,
59 BCH_FORCE_IF_DEGRADED);
60 if (dev
61 ? __bch2_dev_set_state(c, ca, BCH_MEMBER_STATE_ro,
62 BCH_FORCE_IF_DEGRADED)
63 : bch2_fs_emergency_read_only(c))
64 bch_err(ca,
65 "too many IO errors, setting %s RO",
66 dev ? "device" : "filesystem");
67 up_write(&c->state_lock);
68 }
69
70 void bch2_io_error(struct bch_dev *ca, enum bch_member_error_type type)
71 {
72 atomic64_inc(&ca->errors[type]);
73 //queue_work(system_long_wq, &ca->io_error_work);
74 }
75
76 enum ask_yn {
77 YN_NO,
78 YN_YES,
79 YN_ALLNO,
80 YN_ALLYES,
81 };
82
83 static enum ask_yn parse_yn_response(char *buf)
84 {
85 buf = strim(buf);
86
87 if (strlen(buf) == 1)
88 switch (buf[0]) {
89 case 'n':
90 return YN_NO;
91 case 'y':
92 return YN_YES;
93 case 'N':
94 return YN_ALLNO;
95 case 'Y':
96 return YN_ALLYES;
97 }
98 return -1;
99 }
100
101 #ifdef __KERNEL__
102 static enum ask_yn bch2_fsck_ask_yn(struct bch_fs *c, struct btree_trans *trans)
103 {
104 struct stdio_redirect *stdio = c->stdio;
105
106 if (c->stdio_filter && c->stdio_filter != current)
107 stdio = NULL;
108
109 if (!stdio)
110 return YN_NO;
111
112 if (trans)
113 bch2_trans_unlock(trans);
114
115 unsigned long unlock_long_at = trans ? jiffies + HZ * 2 : 0;
116 darray_char line = {};
117 int ret;
118
119 do {
120 unsigned long t;
121 bch2_print(c, " (y,n, or Y,N for all errors of this type) ");
122 rewait:
123 t = unlock_long_at
124 ? max_t(long, unlock_long_at - jiffies, 0)
125 : MAX_SCHEDULE_TIMEOUT;
126
127 int r = bch2_stdio_redirect_readline_timeout(stdio, &line, t);
128 if (r == -ETIME) {
129 bch2_trans_unlock_long(trans);
130 unlock_long_at = 0;
131 goto rewait;
132 }
133
134 if (r < 0) {
135 ret = YN_NO;
136 break;
137 }
138
139 darray_last(line) = '\0';
140 } while ((ret = parse_yn_response(line.data)) < 0);
141
142 darray_exit(&line);
143 return ret;
144 }
145 #else
146
147 #include "tools-util.h"
148
149 static enum ask_yn bch2_fsck_ask_yn(struct bch_fs *c, struct btree_trans *trans)
150 {
151 char *buf = NULL;
152 size_t buflen = 0;
153 int ret;
154
155 do {
156 fputs(" (y,n, or Y,N for all errors of this type) ", stdout);
157 fflush(stdout);
158
159 if (getline(&buf, &buflen, stdin) < 0)
160 die("error reading from standard input");
161 } while ((ret = parse_yn_response(buf)) < 0);
162
163 free(buf);
164 return ret;
165 }
166
167 #endif
168
169 static struct fsck_err_state *fsck_err_get(struct bch_fs *c, const char *fmt)
170 {
171 struct fsck_err_state *s;
172
173 if (!test_bit(BCH_FS_fsck_running, &c->flags))
174 return NULL;
175
176 list_for_each_entry(s, &c->fsck_error_msgs, list)
177 if (s->fmt == fmt) {
178 /*
179 * move it to the head of the list: repeated fsck errors
180 * are common
181 */
182 list_move(&s->list, &c->fsck_error_msgs);
183 return s;
184 }
185
186 s = kzalloc(sizeof(*s), GFP_NOFS);
187 if (!s) {
188 if (!c->fsck_alloc_msgs_err)
189 bch_err(c, "kmalloc err, cannot ratelimit fsck errs");
190 c->fsck_alloc_msgs_err = true;
191 return NULL;
192 }
193
194 INIT_LIST_HEAD(&s->list);
195 s->fmt = fmt;
196 list_add(&s->list, &c->fsck_error_msgs);
197 return s;
198 }
199
200 /* s/fix?/fixing/ s/recreate?/recreating/ */
201 static void prt_actioning(struct printbuf *out, const char *action)
202 {
203 unsigned len = strlen(action);
204
205 BUG_ON(action[len - 1] != '?');
206 --len;
207
208 if (action[len - 1] == 'e')
209 --len;
210
211 prt_bytes(out, action, len);
212 prt_str(out, "ing");
213 }
214
215 static const u8 fsck_flags_extra[] = {
216 #define x(t, n, flags) [BCH_FSCK_ERR_##t] = flags,
217 BCH_SB_ERRS()
218 #undef x
219 };
220
221 int __bch2_fsck_err(struct bch_fs *c,
222 struct btree_trans *trans,
223 enum bch_fsck_flags flags,
224 enum bch_sb_error_id err,
225 const char *fmt, ...)
226 {
227 struct fsck_err_state *s = NULL;
228 va_list args;
229 bool print = true, suppressing = false, inconsistent = false;
230 struct printbuf buf = PRINTBUF, *out = &buf;
231 int ret = -BCH_ERR_fsck_ignore;
232 const char *action_orig = "fix?", *action = action_orig;
233
234 might_sleep();
235
236 if (!WARN_ON(err >= ARRAY_SIZE(fsck_flags_extra)))
237 flags |= fsck_flags_extra[err];
238
239 if (!c)
240 c = trans->c;
241
242 WARN_ON(!trans && bch2_current_has_btree_trans(c));
243
244 if ((flags & FSCK_CAN_FIX) &&
245 test_bit(err, c->sb.errors_silent))
246 return -BCH_ERR_fsck_fix;
247
248 bch2_sb_error_count(c, err);
249
250 va_start(args, fmt);
251 prt_vprintf(out, fmt, args);
252 va_end(args);
253
254 /* Custom fix/continue/recreate/etc.? */
255 if (out->buf[out->pos - 1] == '?') {
256 const char *p = strrchr(out->buf, ',');
257 if (p) {
258 out->pos = p - out->buf;
259 action = kstrdup(p + 2, GFP_KERNEL);
260 if (!action) {
261 ret = -ENOMEM;
262 goto err;
263 }
264 }
265 }
266
267 mutex_lock(&c->fsck_error_msgs_lock);
268 s = fsck_err_get(c, fmt);
269 if (s) {
270 /*
271 * We may be called multiple times for the same error on
272 * transaction restart - this memoizes instead of asking the user
273 * multiple times for the same error:
274 */
275 if (s->last_msg && !strcmp(buf.buf, s->last_msg)) {
276 ret = s->ret;
277 mutex_unlock(&c->fsck_error_msgs_lock);
278 goto err;
279 }
280
281 kfree(s->last_msg);
282 s->last_msg = kstrdup(buf.buf, GFP_KERNEL);
283 if (!s->last_msg) {
284 mutex_unlock(&c->fsck_error_msgs_lock);
285 ret = -ENOMEM;
286 goto err;
287 }
288
289 if (c->opts.ratelimit_errors &&
290 !(flags & FSCK_NO_RATELIMIT) &&
291 s->nr >= FSCK_ERR_RATELIMIT_NR) {
292 if (s->nr == FSCK_ERR_RATELIMIT_NR)
293 suppressing = true;
294 else
295 print = false;
296 }
297
298 s->nr++;
299 }
300
301 #ifdef BCACHEFS_LOG_PREFIX
302 if (!strncmp(fmt, "bcachefs:", 9))
303 prt_printf(out, bch2_log_msg(c, ""));
304 #endif
305
306 if ((flags & FSCK_CAN_FIX) &&
307 (flags & FSCK_AUTOFIX) &&
308 (c->opts.errors == BCH_ON_ERROR_continue ||
309 c->opts.errors == BCH_ON_ERROR_fix_safe)) {
310 prt_str(out, ", ");
311 prt_actioning(out, action);
312 ret = -BCH_ERR_fsck_fix;
313 } else if (!test_bit(BCH_FS_fsck_running, &c->flags)) {
314 if (c->opts.errors != BCH_ON_ERROR_continue ||
315 !(flags & (FSCK_CAN_FIX|FSCK_CAN_IGNORE))) {
316 prt_str(out, ", shutting down");
317 inconsistent = true;
318 ret = -BCH_ERR_fsck_errors_not_fixed;
319 } else if (flags & FSCK_CAN_FIX) {
320 prt_str(out, ", ");
321 prt_actioning(out, action);
322 ret = -BCH_ERR_fsck_fix;
323 } else {
324 prt_str(out, ", continuing");
325 ret = -BCH_ERR_fsck_ignore;
326 }
327 } else if (c->opts.fix_errors == FSCK_FIX_exit) {
328 prt_str(out, ", exiting");
329 ret = -BCH_ERR_fsck_errors_not_fixed;
330 } else if (flags & FSCK_CAN_FIX) {
331 int fix = s && s->fix
332 ? s->fix
333 : c->opts.fix_errors;
334
335 if (fix == FSCK_FIX_ask) {
336 prt_str(out, ", ");
337 prt_str(out, action);
338
339 if (bch2_fs_stdio_redirect(c))
340 bch2_print(c, "%s", out->buf);
341 else
342 bch2_print_string_as_lines(KERN_ERR, out->buf);
343 print = false;
344
345 int ask = bch2_fsck_ask_yn(c, trans);
346
347 if (trans) {
348 ret = bch2_trans_relock(trans);
349 if (ret) {
350 mutex_unlock(&c->fsck_error_msgs_lock);
351 goto err;
352 }
353 }
354
355 if (ask >= YN_ALLNO && s)
356 s->fix = ask == YN_ALLNO
357 ? FSCK_FIX_no
358 : FSCK_FIX_yes;
359
360 ret = ask & 1
361 ? -BCH_ERR_fsck_fix
362 : -BCH_ERR_fsck_ignore;
363 } else if (fix == FSCK_FIX_yes ||
364 (c->opts.nochanges &&
365 !(flags & FSCK_CAN_IGNORE))) {
366 prt_str(out, ", ");
367 prt_actioning(out, action);
368 ret = -BCH_ERR_fsck_fix;
369 } else {
370 prt_str(out, ", not ");
371 prt_actioning(out, action);
372 }
373 } else if (flags & FSCK_NEED_FSCK) {
374 prt_str(out, " (run fsck to correct)");
375 } else {
376 prt_str(out, " (repair unimplemented)");
377 }
378
379 if (ret == -BCH_ERR_fsck_ignore &&
380 (c->opts.fix_errors == FSCK_FIX_exit ||
381 !(flags & FSCK_CAN_IGNORE)))
382 ret = -BCH_ERR_fsck_errors_not_fixed;
383
384 if (print) {
385 if (bch2_fs_stdio_redirect(c))
386 bch2_print(c, "%s\n", out->buf);
387 else
388 bch2_print_string_as_lines(KERN_ERR, out->buf);
389 }
390
391 if (test_bit(BCH_FS_fsck_running, &c->flags) &&
392 (ret != -BCH_ERR_fsck_fix &&
393 ret != -BCH_ERR_fsck_ignore))
394 bch_err(c, "Unable to continue, halting");
395 else if (suppressing)
396 bch_err(c, "Ratelimiting new instances of previous error");
397
398 if (s)
399 s->ret = ret;
400
401 mutex_unlock(&c->fsck_error_msgs_lock);
402
403 if (inconsistent)
404 bch2_inconsistent_error(c);
405
406 if (ret == -BCH_ERR_fsck_fix) {
407 set_bit(BCH_FS_errors_fixed, &c->flags);
408 } else {
409 set_bit(BCH_FS_errors_not_fixed, &c->flags);
410 set_bit(BCH_FS_error, &c->flags);
411 }
412 err:
413 if (action != action_orig)
414 kfree(action);
415 printbuf_exit(&buf);
416 return ret;
417 }
418
419 void bch2_flush_fsck_errs(struct bch_fs *c)
420 {
421 struct fsck_err_state *s, *n;
422
423 mutex_lock(&c->fsck_error_msgs_lock);
424
425 list_for_each_entry_safe(s, n, &c->fsck_error_msgs, list) {
426 if (s->ratelimited && s->last_msg)
427 bch_err(c, "Saw %llu errors like:\n %s", s->nr, s->last_msg);
428
429 list_del(&s->list);
430 kfree(s->last_msg);
431 kfree(s);
432 }
433
434 mutex_unlock(&c->fsck_error_msgs_lock);
435 }
436
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