fs/bcachefs/error.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 #include "bcachefs.h"
 #include "error.h"
 #include "super.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");
 		return true;
 	case BCH_ON_ERROR_panic:
 		panic(bch2_fmt(c, "panic after error"));
 		return true;
 	default:
 		BUG();
 	}
 }

 void bch2_topology_error(struct bch_fs *c)
 {
 	set_bit(BCH_FS_topology_error, &c->flags);
 	if (test_bit(BCH_FS_fsck_done, &c->flags))
 		bch2_inconsistent_error(c);
 }

 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,
 };

 #ifdef __KERNEL__
 #define bch2_fsck_ask_yn()	YN_NO
 #else

 #include "tools-util.h"

 enum ask_yn bch2_fsck_ask_yn(void)
 {
 	char *buf = NULL;
 	size_t buflen = 0;
 	bool ret;

 	while (true) {
 		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");

 		strim(buf);
 		if (strlen(buf) != 1)
 			continue;

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

 	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_done, &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;
 }

 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;

 	if (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);

 	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);
 			printbuf_exit(&buf);
 			return ret;
 		}

 		kfree(s->last_msg);
 		s->last_msg = kstrdup(buf.buf, GFP_KERNEL);

 		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_done, &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, ", fixing");
 			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) {
 			int ask;

 			prt_str(out, ": fix?");
 			bch2_print_string_as_lines(KERN_ERR, out->buf);
 			print = false;

 			ask = bch2_fsck_ask_yn();

 			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, ", fixing");
 			ret = -BCH_ERR_fsck_fix;
 		} else {
 			prt_str(out, ", not fixing");
 		}
 	} 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)
 		bch2_print_string_as_lines(KERN_ERR, out->buf);

 	if (!test_bit(BCH_FS_fsck_done, &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);

 	printbuf_exit(&buf);

 	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);
 	}

 	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);
 }
	// SPDX-License-Identifier: GPL-2.0
	#include "bcachefs.h"
	#include "error.h"
	#include "super.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");
	return true;
	case BCH_ON_ERROR_panic:
	panic(bch2_fmt(c, "panic after error"));
	return true;
	default:
	BUG();
	}
	}

	void bch2_topology_error(struct bch_fs *c)
	{
	set_bit(BCH_FS_topology_error, &c->flags);
	if (test_bit(BCH_FS_fsck_done, &c->flags))
	bch2_inconsistent_error(c);
	}

	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,
	};

	#ifdef __KERNEL__
	#define bch2_fsck_ask_yn() YN_NO
	#else

	#include "tools-util.h"

	enum ask_yn bch2_fsck_ask_yn(void)
	{
	char *buf = NULL;
	size_t buflen = 0;
	bool ret;

	while (true) {
	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");

	strim(buf);
	if (strlen(buf) != 1)
	continue;

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

	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_done, &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;
	}

	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;

	if (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);

	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);
	printbuf_exit(&buf);
	return ret;
	}

	kfree(s->last_msg);
	s->last_msg = kstrdup(buf.buf, GFP_KERNEL);

	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_done, &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, ", fixing");
	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) {
	int ask;

	prt_str(out, ": fix?");
	bch2_print_string_as_lines(KERN_ERR, out->buf);
	print = false;

	ask = bch2_fsck_ask_yn();

	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, ", fixing");
	ret = -BCH_ERR_fsck_fix;
	} else {
	prt_str(out, ", not fixing");
	}
	} 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)
	bch2_print_string_as_lines(KERN_ERR, out->buf);

	if (!test_bit(BCH_FS_fsck_done, &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);

	printbuf_exit(&buf);

	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);
	}

	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);
	}