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  1// SPDX-License-Identifier: GPL-2.0
  2#include "bcachefs.h"
  3#include "error.h"
  4#include "super.h"
  5#include "thread_with_file.h"
  6
  7#define FSCK_ERR_RATELIMIT_NR	10
  8
  9bool bch2_inconsistent_error(struct bch_fs *c)
 10{
 11	set_bit(BCH_FS_error, &c->flags);
 12
 13	switch (c->opts.errors) {
 14	case BCH_ON_ERROR_continue:
 15		return false;
 16	case BCH_ON_ERROR_ro:
 17		if (bch2_fs_emergency_read_only(c))
 18			bch_err(c, "inconsistency detected - emergency read only");
 19		return true;
 20	case BCH_ON_ERROR_panic:
 21		panic(bch2_fmt(c, "panic after error"));
 22		return true;
 23	default:
 24		BUG();
 25	}
 26}
 27
 28void bch2_topology_error(struct bch_fs *c)
 29{
 30	set_bit(BCH_FS_topology_error, &c->flags);
 31	if (!test_bit(BCH_FS_fsck_running, &c->flags))
 32		bch2_inconsistent_error(c);
 33}
 34
 35void bch2_fatal_error(struct bch_fs *c)
 36{
 37	if (bch2_fs_emergency_read_only(c))
 38		bch_err(c, "fatal error - emergency read only");
 39}
 40
 41void bch2_io_error_work(struct work_struct *work)
 42{
 43	struct bch_dev *ca = container_of(work, struct bch_dev, io_error_work);
 44	struct bch_fs *c = ca->fs;
 45	bool dev;
 46
 47	down_write(&c->state_lock);
 48	dev = bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_ro,
 49				    BCH_FORCE_IF_DEGRADED);
 50	if (dev
 51	    ? __bch2_dev_set_state(c, ca, BCH_MEMBER_STATE_ro,
 52				  BCH_FORCE_IF_DEGRADED)
 53	    : bch2_fs_emergency_read_only(c))
 54		bch_err(ca,
 55			"too many IO errors, setting %s RO",
 56			dev ? "device" : "filesystem");
 57	up_write(&c->state_lock);
 58}
 59
 60void bch2_io_error(struct bch_dev *ca, enum bch_member_error_type type)
 61{
 62	atomic64_inc(&ca->errors[type]);
 63	//queue_work(system_long_wq, &ca->io_error_work);
 64}
 65
 66enum ask_yn {
 67	YN_NO,
 68	YN_YES,
 69	YN_ALLNO,
 70	YN_ALLYES,
 71};
 72
 73static enum ask_yn parse_yn_response(char *buf)
 74{
 75	buf = strim(buf);
 76
 77	if (strlen(buf) == 1)
 78		switch (buf[0]) {
 79		case 'n':
 80			return YN_NO;
 81		case 'y':
 82			return YN_YES;
 83		case 'N':
 84			return YN_ALLNO;
 85		case 'Y':
 86			return YN_ALLYES;
 87		}
 88	return -1;
 89}
 90
 91#ifdef __KERNEL__
 92static enum ask_yn bch2_fsck_ask_yn(struct bch_fs *c)
 93{
 94	struct stdio_redirect *stdio = c->stdio;
 95
 96	if (c->stdio_filter && c->stdio_filter != current)
 97		stdio = NULL;
 98
 99	if (!stdio)
100		return YN_NO;
101
102	char buf[100];
103	int ret;
104
105	do {
106		bch2_print(c, " (y,n, or Y,N for all errors of this type) ");
107
108		int r = bch2_stdio_redirect_readline(stdio, buf, sizeof(buf) - 1);
109		if (r < 0)
110			return YN_NO;
111		buf[r] = '\0';
112	} while ((ret = parse_yn_response(buf)) < 0);
113
114	return ret;
115}
116#else
117
118#include "tools-util.h"
119
120static enum ask_yn bch2_fsck_ask_yn(struct bch_fs *c)
121{
122	char *buf = NULL;
123	size_t buflen = 0;
124	int ret;
125
126	do {
127		fputs(" (y,n, or Y,N for all errors of this type) ", stdout);
128		fflush(stdout);
129
130		if (getline(&buf, &buflen, stdin) < 0)
131			die("error reading from standard input");
132	} while ((ret = parse_yn_response(buf)) < 0);
133
134	free(buf);
135	return ret;
136}
137
138#endif
139
140static struct fsck_err_state *fsck_err_get(struct bch_fs *c, const char *fmt)
141{
142	struct fsck_err_state *s;
143
144	if (!test_bit(BCH_FS_fsck_running, &c->flags))
145		return NULL;
146
147	list_for_each_entry(s, &c->fsck_error_msgs, list)
148		if (s->fmt == fmt) {
149			/*
150			 * move it to the head of the list: repeated fsck errors
151			 * are common
152			 */
153			list_move(&s->list, &c->fsck_error_msgs);
154			return s;
155		}
156
157	s = kzalloc(sizeof(*s), GFP_NOFS);
158	if (!s) {
159		if (!c->fsck_alloc_msgs_err)
160			bch_err(c, "kmalloc err, cannot ratelimit fsck errs");
161		c->fsck_alloc_msgs_err = true;
162		return NULL;
163	}
164
165	INIT_LIST_HEAD(&s->list);
166	s->fmt = fmt;
167	list_add(&s->list, &c->fsck_error_msgs);
168	return s;
169}
170
171int bch2_fsck_err(struct bch_fs *c,
172		  enum bch_fsck_flags flags,
173		  enum bch_sb_error_id err,
174		  const char *fmt, ...)
175{
176	struct fsck_err_state *s = NULL;
177	va_list args;
178	bool print = true, suppressing = false, inconsistent = false;
179	struct printbuf buf = PRINTBUF, *out = &buf;
180	int ret = -BCH_ERR_fsck_ignore;
181
182	if ((flags & FSCK_CAN_FIX) &&
183	    test_bit(err, c->sb.errors_silent))
184		return -BCH_ERR_fsck_fix;
185
186	bch2_sb_error_count(c, err);
187
188	va_start(args, fmt);
189	prt_vprintf(out, fmt, args);
190	va_end(args);
191
192	mutex_lock(&c->fsck_error_msgs_lock);
193	s = fsck_err_get(c, fmt);
194	if (s) {
195		/*
196		 * We may be called multiple times for the same error on
197		 * transaction restart - this memoizes instead of asking the user
198		 * multiple times for the same error:
199		 */
200		if (s->last_msg && !strcmp(buf.buf, s->last_msg)) {
201			ret = s->ret;
202			mutex_unlock(&c->fsck_error_msgs_lock);
203			printbuf_exit(&buf);
204			return ret;
205		}
206
207		kfree(s->last_msg);
208		s->last_msg = kstrdup(buf.buf, GFP_KERNEL);
209
210		if (c->opts.ratelimit_errors &&
211		    !(flags & FSCK_NO_RATELIMIT) &&
212		    s->nr >= FSCK_ERR_RATELIMIT_NR) {
213			if (s->nr == FSCK_ERR_RATELIMIT_NR)
214				suppressing = true;
215			else
216				print = false;
217		}
218
219		s->nr++;
220	}
221
222#ifdef BCACHEFS_LOG_PREFIX
223	if (!strncmp(fmt, "bcachefs:", 9))
224		prt_printf(out, bch2_log_msg(c, ""));
225#endif
226
227	if (!test_bit(BCH_FS_fsck_running, &c->flags)) {
228		if (c->opts.errors != BCH_ON_ERROR_continue ||
229		    !(flags & (FSCK_CAN_FIX|FSCK_CAN_IGNORE))) {
230			prt_str(out, ", shutting down");
231			inconsistent = true;
232			ret = -BCH_ERR_fsck_errors_not_fixed;
233		} else if (flags & FSCK_CAN_FIX) {
234			prt_str(out, ", fixing");
235			ret = -BCH_ERR_fsck_fix;
236		} else {
237			prt_str(out, ", continuing");
238			ret = -BCH_ERR_fsck_ignore;
239		}
240	} else if (c->opts.fix_errors == FSCK_FIX_exit) {
241		prt_str(out, ", exiting");
242		ret = -BCH_ERR_fsck_errors_not_fixed;
243	} else if (flags & FSCK_CAN_FIX) {
244		int fix = s && s->fix
245			? s->fix
246			: c->opts.fix_errors;
247
248		if (fix == FSCK_FIX_ask) {
249			int ask;
250
251			prt_str(out, ": fix?");
252			if (bch2_fs_stdio_redirect(c))
253				bch2_print(c, "%s", out->buf);
254			else
255				bch2_print_string_as_lines(KERN_ERR, out->buf);
256			print = false;
257
258			ask = bch2_fsck_ask_yn(c);
259
260			if (ask >= YN_ALLNO && s)
261				s->fix = ask == YN_ALLNO
262					? FSCK_FIX_no
263					: FSCK_FIX_yes;
264
265			ret = ask & 1
266				? -BCH_ERR_fsck_fix
267				: -BCH_ERR_fsck_ignore;
268		} else if (fix == FSCK_FIX_yes ||
269			   (c->opts.nochanges &&
270			    !(flags & FSCK_CAN_IGNORE))) {
271			prt_str(out, ", fixing");
272			ret = -BCH_ERR_fsck_fix;
273		} else {
274			prt_str(out, ", not fixing");
275		}
276	} else if (flags & FSCK_NEED_FSCK) {
277		prt_str(out, " (run fsck to correct)");
278	} else {
279		prt_str(out, " (repair unimplemented)");
280	}
281
282	if (ret == -BCH_ERR_fsck_ignore &&
283	    (c->opts.fix_errors == FSCK_FIX_exit ||
284	     !(flags & FSCK_CAN_IGNORE)))
285		ret = -BCH_ERR_fsck_errors_not_fixed;
286
287	if (print) {
288		if (bch2_fs_stdio_redirect(c))
289			bch2_print(c, "%s\n", out->buf);
290		else
291			bch2_print_string_as_lines(KERN_ERR, out->buf);
292	}
293
294	if (test_bit(BCH_FS_fsck_running, &c->flags) &&
295	    (ret != -BCH_ERR_fsck_fix &&
296	     ret != -BCH_ERR_fsck_ignore))
297		bch_err(c, "Unable to continue, halting");
298	else if (suppressing)
299		bch_err(c, "Ratelimiting new instances of previous error");
300
301	if (s)
302		s->ret = ret;
303
304	mutex_unlock(&c->fsck_error_msgs_lock);
305
306	printbuf_exit(&buf);
307
308	if (inconsistent)
309		bch2_inconsistent_error(c);
310
311	if (ret == -BCH_ERR_fsck_fix) {
312		set_bit(BCH_FS_errors_fixed, &c->flags);
313	} else {
314		set_bit(BCH_FS_errors_not_fixed, &c->flags);
315		set_bit(BCH_FS_error, &c->flags);
316	}
317
318	return ret;
319}
320
321void bch2_flush_fsck_errs(struct bch_fs *c)
322{
323	struct fsck_err_state *s, *n;
324
325	mutex_lock(&c->fsck_error_msgs_lock);
326
327	list_for_each_entry_safe(s, n, &c->fsck_error_msgs, list) {
328		if (s->ratelimited && s->last_msg)
329			bch_err(c, "Saw %llu errors like:\n    %s", s->nr, s->last_msg);
330
331		list_del(&s->list);
332		kfree(s->last_msg);
333		kfree(s);
334	}
335
336	mutex_unlock(&c->fsck_error_msgs_lock);
337}