summaryrefslogtreecommitdiffstats
path: root/fs/bcachefs/error.c
blob: c66eeffcd7f2a85d85da7873125aba0ef2df41a7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "error.h"
#include "journal.h"
#include "recovery_passes.h"
#include "super.h"
#include "thread_with_file.h"

#define FSCK_ERR_RATELIMIT_NR	10

bool bch2_inconsistent_error(struct bch_fs *c)
{
	set_bit(BCH_FS_error, &c->flags);

	switch (c->opts.errors) {
	case BCH_ON_ERROR_continue:
		return false;
	case BCH_ON_ERROR_ro:
		if (bch2_fs_emergency_read_only(c))
			bch_err(c, "inconsistency detected - emergency read only at journal seq %llu",
				journal_cur_seq(&c->journal));
		return true;
	case BCH_ON_ERROR_panic:
		panic(bch2_fmt(c, "panic after error"));
		return true;
	default:
		BUG();
	}
}

int bch2_topology_error(struct bch_fs *c)
{
	set_bit(BCH_FS_topology_error, &c->flags);
	if (!test_bit(BCH_FS_fsck_running, &c->flags)) {
		bch2_inconsistent_error(c);
		return -BCH_ERR_btree_need_topology_repair;
	} else {
		return bch2_run_explicit_recovery_pass(c, BCH_RECOVERY_PASS_check_topology) ?:
			-BCH_ERR_btree_node_read_validate_error;
	}
}

void bch2_fatal_error(struct bch_fs *c)
{
	if (bch2_fs_emergency_read_only(c))
		bch_err(c, "fatal error - emergency read only");
}

void bch2_io_error_work(struct work_struct *work)
{
	struct bch_dev *ca = container_of(work, struct bch_dev, io_error_work);
	struct bch_fs *c = ca->fs;
	bool dev;

	down_write(&c->state_lock);
	dev = bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_ro,
				    BCH_FORCE_IF_DEGRADED);
	if (dev
	    ? __bch2_dev_set_state(c, ca, BCH_MEMBER_STATE_ro,
				  BCH_FORCE_IF_DEGRADED)
	    : bch2_fs_emergency_read_only(c))
		bch_err(ca,
			"too many IO errors, setting %s RO",
			dev ? "device" : "filesystem");
	up_write(&c->state_lock);
}

void bch2_io_error(struct bch_dev *ca, enum bch_member_error_type type)
{
	atomic64_inc(&ca->errors[type]);
	//queue_work(system_long_wq, &ca->io_error_work);
}

enum ask_yn {
	YN_NO,
	YN_YES,
	YN_ALLNO,
	YN_ALLYES,
};

static enum ask_yn parse_yn_response(char *buf)
{
	buf = strim(buf);

	if (strlen(buf) == 1)
		switch (buf[0]) {
		case 'n':
			return YN_NO;
		case 'y':
			return YN_YES;
		case 'N':
			return YN_ALLNO;
		case 'Y':
			return YN_ALLYES;
		}
	return -1;
}

#ifdef __KERNEL__
static enum ask_yn bch2_fsck_ask_yn(struct bch_fs *c)
{
	struct stdio_redirect *stdio = c->stdio;

	if (c->stdio_filter && c->stdio_filter != current)
		stdio = NULL;

	if (!stdio)
		return YN_NO;

	char buf[100];
	int ret;

	do {
		bch2_print(c, " (y,n, or Y,N for all errors of this type) ");

		int r = bch2_stdio_redirect_readline(stdio, buf, sizeof(buf) - 1);
		if (r < 0)
			return YN_NO;
		buf[r] = '\0';
	} while ((ret = parse_yn_response(buf)) < 0);

	return ret;
}
#else

#include "tools-util.h"

static enum ask_yn bch2_fsck_ask_yn(struct bch_fs *c)
{
	char *buf = NULL;
	size_t buflen = 0;
	int ret;

	do {
		fputs(" (y,n, or Y,N for all errors of this type) ", stdout);
		fflush(stdout);

		if (getline(&buf, &buflen, stdin) < 0)
			die("error reading from standard input");
	} while ((ret = parse_yn_response(buf)) < 0);

	free(buf);
	return ret;
}

#endif

static struct fsck_err_state *fsck_err_get(struct bch_fs *c, const char *fmt)
{
	struct fsck_err_state *s;

	if (!test_bit(BCH_FS_fsck_running, &c->flags))
		return NULL;

	list_for_each_entry(s, &c->fsck_error_msgs, list)
		if (s->fmt == fmt) {
			/*
			 * move it to the head of the list: repeated fsck errors
			 * are common
			 */
			list_move(&s->list, &c->fsck_error_msgs);
			return s;
		}

	s = kzalloc(sizeof(*s), GFP_NOFS);
	if (!s) {
		if (!c->fsck_alloc_msgs_err)
			bch_err(c, "kmalloc err, cannot ratelimit fsck errs");
		c->fsck_alloc_msgs_err = true;
		return NULL;
	}

	INIT_LIST_HEAD(&s->list);
	s->fmt = fmt;
	list_add(&s->list, &c->fsck_error_msgs);
	return s;
}

/* s/fix?/fixing/ s/recreate?/recreating/ */
static void prt_actioning(struct printbuf *out, const char *action)
{
	unsigned len = strlen(action);

	BUG_ON(action[len - 1] != '?');
	--len;

	if (action[len - 1] == 'e')
		--len;

	prt_bytes(out, action, len);
	prt_str(out, "ing");
}

int bch2_fsck_err(struct bch_fs *c,
		  enum bch_fsck_flags flags,
		  enum bch_sb_error_id err,
		  const char *fmt, ...)
{
	struct fsck_err_state *s = NULL;
	va_list args;
	bool print = true, suppressing = false, inconsistent = false;
	struct printbuf buf = PRINTBUF, *out = &buf;
	int ret = -BCH_ERR_fsck_ignore;
	const char *action_orig = "fix?", *action = action_orig;

	if ((flags & FSCK_CAN_FIX) &&
	    test_bit(err, c->sb.errors_silent))
		return -BCH_ERR_fsck_fix;

	bch2_sb_error_count(c, err);

	va_start(args, fmt);
	prt_vprintf(out, fmt, args);
	va_end(args);

	/* Custom fix/continue/recreate/etc.? */
	if (out->buf[out->pos - 1] == '?') {
		const char *p = strrchr(out->buf, ',');
		if (p) {
			out->pos = p - out->buf;
			action = kstrdup(p + 2, GFP_KERNEL);
			if (!action) {
				ret = -ENOMEM;
				goto err;
			}
		}
	}

	mutex_lock(&c->fsck_error_msgs_lock);
	s = fsck_err_get(c, fmt);
	if (s) {
		/*
		 * We may be called multiple times for the same error on
		 * transaction restart - this memoizes instead of asking the user
		 * multiple times for the same error:
		 */
		if (s->last_msg && !strcmp(buf.buf, s->last_msg)) {
			ret = s->ret;
			mutex_unlock(&c->fsck_error_msgs_lock);
			goto err;
		}

		kfree(s->last_msg);
		s->last_msg = kstrdup(buf.buf, GFP_KERNEL);
		if (!s->last_msg) {
			mutex_unlock(&c->fsck_error_msgs_lock);
			ret = -ENOMEM;
			goto err;
		}

		if (c->opts.ratelimit_errors &&
		    !(flags & FSCK_NO_RATELIMIT) &&
		    s->nr >= FSCK_ERR_RATELIMIT_NR) {
			if (s->nr == FSCK_ERR_RATELIMIT_NR)
				suppressing = true;
			else
				print = false;
		}

		s->nr++;
	}

#ifdef BCACHEFS_LOG_PREFIX
	if (!strncmp(fmt, "bcachefs:", 9))
		prt_printf(out, bch2_log_msg(c, ""));
#endif

	if (!test_bit(BCH_FS_fsck_running, &c->flags)) {
		if (c->opts.errors != BCH_ON_ERROR_continue ||
		    !(flags & (FSCK_CAN_FIX|FSCK_CAN_IGNORE))) {
			prt_str(out, ", shutting down");
			inconsistent = true;
			ret = -BCH_ERR_fsck_errors_not_fixed;
		} else if (flags & FSCK_CAN_FIX) {
			prt_str(out, ", ");
			prt_actioning(out, action);
			ret = -BCH_ERR_fsck_fix;
		} else {
			prt_str(out, ", continuing");
			ret = -BCH_ERR_fsck_ignore;
		}
	} else if (c->opts.fix_errors == FSCK_FIX_exit) {
		prt_str(out, ", exiting");
		ret = -BCH_ERR_fsck_errors_not_fixed;
	} else if (flags & FSCK_CAN_FIX) {
		int fix = s && s->fix
			? s->fix
			: c->opts.fix_errors;

		if (fix == FSCK_FIX_ask) {
			prt_str(out, ", ");
			prt_str(out, action);

			if (bch2_fs_stdio_redirect(c))
				bch2_print(c, "%s", out->buf);
			else
				bch2_print_string_as_lines(KERN_ERR, out->buf);
			print = false;

			int ask = bch2_fsck_ask_yn(c);

			if (ask >= YN_ALLNO && s)
				s->fix = ask == YN_ALLNO
					? FSCK_FIX_no
					: FSCK_FIX_yes;

			ret = ask & 1
				? -BCH_ERR_fsck_fix
				: -BCH_ERR_fsck_ignore;
		} else if (fix == FSCK_FIX_yes ||
			   (c->opts.nochanges &&
			    !(flags & FSCK_CAN_IGNORE))) {
			prt_str(out, ", ");
			prt_actioning(out, action);
			ret = -BCH_ERR_fsck_fix;
		} else {
			prt_str(out, ", not ");
			prt_actioning(out, action);
		}
	} else if (flags & FSCK_NEED_FSCK) {
		prt_str(out, " (run fsck to correct)");
	} else {
		prt_str(out, " (repair unimplemented)");
	}

	if (ret == -BCH_ERR_fsck_ignore &&
	    (c->opts.fix_errors == FSCK_FIX_exit ||
	     !(flags & FSCK_CAN_IGNORE)))
		ret = -BCH_ERR_fsck_errors_not_fixed;

	if (print) {
		if (bch2_fs_stdio_redirect(c))
			bch2_print(c, "%s\n", out->buf);
		else
			bch2_print_string_as_lines(KERN_ERR, out->buf);
	}

	if (test_bit(BCH_FS_fsck_running, &c->flags) &&
	    (ret != -BCH_ERR_fsck_fix &&
	     ret != -BCH_ERR_fsck_ignore))
		bch_err(c, "Unable to continue, halting");
	else if (suppressing)
		bch_err(c, "Ratelimiting new instances of previous error");

	if (s)
		s->ret = ret;

	mutex_unlock(&c->fsck_error_msgs_lock);

	if (inconsistent)
		bch2_inconsistent_error(c);

	if (ret == -BCH_ERR_fsck_fix) {
		set_bit(BCH_FS_errors_fixed, &c->flags);
	} else {
		set_bit(BCH_FS_errors_not_fixed, &c->flags);
		set_bit(BCH_FS_error, &c->flags);
	}
err:
	if (action != action_orig)
		kfree(action);
	printbuf_exit(&buf);
	return ret;
}

void bch2_flush_fsck_errs(struct bch_fs *c)
{
	struct fsck_err_state *s, *n;

	mutex_lock(&c->fsck_error_msgs_lock);

	list_for_each_entry_safe(s, n, &c->fsck_error_msgs, list) {
		if (s->ratelimited && s->last_msg)
			bch_err(c, "Saw %llu errors like:\n    %s", s->nr, s->last_msg);

		list_del(&s->list);
		kfree(s->last_msg);
		kfree(s);
	}

	mutex_unlock(&c->fsck_error_msgs_lock);
}