summaryrefslogtreecommitdiffstats
path: root/fs/bcachefs/error.h
blob: 2591e12305b710df1ec0e5e1ab8b7e0039e098b0 (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
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHEFS_ERROR_H
#define _BCACHEFS_ERROR_H

#include <linux/list.h>
#include <linux/printk.h>

struct bch_dev;
struct bch_fs;
struct work_struct;

/*
 * XXX: separate out errors that indicate on disk data is inconsistent, and flag
 * superblock as such
 */

/* Error messages: */

/*
 * Very fatal logic/inconsistency errors: these indicate that we've majorly
 * screwed up at runtime, i.e. it's not likely that it was just caused by the
 * data on disk being inconsistent. These BUG():
 *
 * XXX: audit and convert to inconsistent() checks
 */

#define bch2_fs_bug(c, ...)						\
do {									\
	bch_err(c, __VA_ARGS__);					\
	BUG();								\
} while (0)

#define bch2_fs_bug_on(cond, c, ...)					\
do {									\
	if (cond)							\
		bch2_fs_bug(c, __VA_ARGS__);				\
} while (0)

/*
 * Inconsistency errors: The on disk data is inconsistent. If these occur during
 * initial recovery, they don't indicate a bug in the running code - we walk all
 * the metadata before modifying anything. If they occur at runtime, they
 * indicate either a bug in the running code or (less likely) data is being
 * silently corrupted under us.
 *
 * XXX: audit all inconsistent errors and make sure they're all recoverable, in
 * BCH_ON_ERROR_CONTINUE mode
 */

bool bch2_inconsistent_error(struct bch_fs *);

#define bch2_fs_inconsistent(c, ...)					\
({									\
	bch_err(c, __VA_ARGS__);					\
	bch2_inconsistent_error(c);					\
})

#define bch2_fs_inconsistent_on(cond, c, ...)				\
({									\
	int _ret = !!(cond);						\
									\
	if (_ret)							\
		bch2_fs_inconsistent(c, __VA_ARGS__);			\
	_ret;								\
})

/*
 * Later we might want to mark only the particular device inconsistent, not the
 * entire filesystem:
 */

#define bch2_dev_inconsistent(ca, ...)					\
do {									\
	bch_err(ca, __VA_ARGS__);					\
	bch2_inconsistent_error((ca)->fs);				\
} while (0)

#define bch2_dev_inconsistent_on(cond, ca, ...)				\
({									\
	int _ret = !!(cond);						\
									\
	if (_ret)							\
		bch2_dev_inconsistent(ca, __VA_ARGS__);			\
	_ret;								\
})

/*
 * Fsck errors: inconsistency errors we detect at mount time, and should ideally
 * be able to repair:
 */

enum {
	BCH_FSCK_OK			= 0,
	BCH_FSCK_ERRORS_NOT_FIXED	= 1,
	BCH_FSCK_REPAIR_UNIMPLEMENTED	= 2,
	BCH_FSCK_REPAIR_IMPOSSIBLE	= 3,
	BCH_FSCK_UNKNOWN_VERSION	= 4,
};

enum fsck_err_opts {
	FSCK_OPT_EXIT,
	FSCK_OPT_YES,
	FSCK_OPT_NO,
	FSCK_OPT_ASK,
};

enum fsck_err_ret {
	FSCK_ERR_IGNORE	= 0,
	FSCK_ERR_FIX	= 1,
	FSCK_ERR_EXIT	= 2,
};

struct fsck_err_state {
	struct list_head	list;
	const char		*fmt;
	u64			nr;
	char			buf[512];
};

#define FSCK_CAN_FIX		(1 << 0)
#define FSCK_CAN_IGNORE		(1 << 1)
#define FSCK_NEED_FSCK		(1 << 2)

enum fsck_err_ret bch2_fsck_err(struct bch_fs *,
				unsigned, const char *, ...);
void bch2_flush_fsck_errs(struct bch_fs *);

#define __fsck_err(c, _flags, msg, ...)					\
({									\
	int _fix = bch2_fsck_err(c, _flags, msg, ##__VA_ARGS__);\
									\
	if (_fix == FSCK_ERR_EXIT) {					\
		bch_err(c, "Unable to continue, halting");		\
		ret = BCH_FSCK_ERRORS_NOT_FIXED;			\
		goto fsck_err;						\
	}								\
									\
	_fix;								\
})

/* These macros return true if error should be fixed: */

/* XXX: mark in superblock that filesystem contains errors, if we ignore: */

#define __fsck_err_on(cond, c, _flags, ...)				\
	((cond) ? __fsck_err(c, _flags,	##__VA_ARGS__) : false)

#define need_fsck_err_on(cond, c, ...)					\
	__fsck_err_on(cond, c, FSCK_CAN_IGNORE|FSCK_NEED_FSCK, ##__VA_ARGS__)

#define need_fsck_err(c, ...)						\
	__fsck_err(c, FSCK_CAN_IGNORE|FSCK_NEED_FSCK, ##__VA_ARGS__)

#define mustfix_fsck_err(c, ...)					\
	__fsck_err(c, FSCK_CAN_FIX, ##__VA_ARGS__)

#define mustfix_fsck_err_on(cond, c, ...)				\
	__fsck_err_on(cond, c, FSCK_CAN_FIX, ##__VA_ARGS__)

#define fsck_err(c, ...)						\
	__fsck_err(c, FSCK_CAN_FIX|FSCK_CAN_IGNORE, ##__VA_ARGS__)

#define fsck_err_on(cond, c, ...)					\
	__fsck_err_on(cond, c, FSCK_CAN_FIX|FSCK_CAN_IGNORE, ##__VA_ARGS__)

/*
 * Fatal errors: these don't indicate a bug, but we can't continue running in RW
 * mode - pretty much just due to metadata IO errors:
 */

void bch2_fatal_error(struct bch_fs *);

#define bch2_fs_fatal_error(c, ...)					\
do {									\
	bch_err(c, __VA_ARGS__);					\
	bch2_fatal_error(c);						\
} while (0)

#define bch2_fs_fatal_err_on(cond, c, ...)				\
({									\
	int _ret = !!(cond);						\
									\
	if (_ret)							\
		bch2_fs_fatal_error(c, __VA_ARGS__);			\
	_ret;								\
})

/*
 * IO errors: either recoverable metadata IO (because we have replicas), or data
 * IO - we need to log it and print out a message, but we don't (necessarily)
 * want to shut down the fs:
 */

void bch2_io_error_work(struct work_struct *);

/* Does the error handling without logging a message */
void bch2_io_error(struct bch_dev *);

/* Logs message and handles the error: */
#define bch2_dev_io_error(ca, fmt, ...)					\
do {									\
	printk_ratelimited(KERN_ERR bch2_fmt((ca)->fs,			\
		"IO error on %s for " fmt),				\
		(ca)->name, ##__VA_ARGS__);				\
	bch2_io_error(ca);						\
} while (0)

#define bch2_dev_io_err_on(cond, ca, ...)				\
({									\
	bool _ret = (cond);						\
									\
	if (_ret)							\
		bch2_dev_io_error(ca, __VA_ARGS__);			\
	_ret;								\
})

/* kill? */

#define __bcache_io_error(c, fmt, ...)					\
	printk_ratelimited(KERN_ERR bch2_fmt(c,				\
			"IO error: " fmt), ##__VA_ARGS__)

#define bcache_io_error(c, bio, fmt, ...)				\
do {									\
	__bcache_io_error(c, fmt, ##__VA_ARGS__);			\
	(bio)->bi_status = BLK_STS_IOERR;					\
} while (0)

#endif /* _BCACHEFS_ERROR_H */