summaryrefslogtreecommitdiffstats
path: root/fs/bcachefs/recovery_passes.c
blob: c065c0d012125740596c5e35c665595b0bea2c2b (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
// SPDX-License-Identifier: GPL-2.0

#include "bcachefs.h"
#include "alloc_background.h"
#include "backpointers.h"
#include "btree_gc.h"
#include "btree_node_scan.h"
#include "ec.h"
#include "fsck.h"
#include "inode.h"
#include "journal.h"
#include "lru.h"
#include "logged_ops.h"
#include "rebalance.h"
#include "recovery.h"
#include "recovery_passes.h"
#include "snapshot.h"
#include "subvolume.h"
#include "super.h"
#include "super-io.h"

const char * const bch2_recovery_passes[] = {
#define x(_fn, ...)	#_fn,
	BCH_RECOVERY_PASSES()
#undef x
	NULL
};

static int bch2_set_may_go_rw(struct bch_fs *c)
{
	struct journal_keys *keys = &c->journal_keys;

	/*
	 * After we go RW, the journal keys buffer can't be modified (except for
	 * setting journal_key->overwritten: it will be accessed by multiple
	 * threads
	 */
	move_gap(keys, keys->nr);

	set_bit(BCH_FS_may_go_rw, &c->flags);

	if (keys->nr || c->opts.fsck || !c->sb.clean || c->recovery_passes_explicit)
		return bch2_fs_read_write_early(c);
	return 0;
}

struct recovery_pass_fn {
	int		(*fn)(struct bch_fs *);
	unsigned	when;
};

static struct recovery_pass_fn recovery_pass_fns[] = {
#define x(_fn, _id, _when)	{ .fn = bch2_##_fn, .when = _when },
	BCH_RECOVERY_PASSES()
#undef x
};

static const u8 passes_to_stable_map[] = {
#define x(n, id, ...)	[BCH_RECOVERY_PASS_##n] = BCH_RECOVERY_PASS_STABLE_##n,
	BCH_RECOVERY_PASSES()
#undef x
};

static enum bch_recovery_pass_stable bch2_recovery_pass_to_stable(enum bch_recovery_pass pass)
{
	return passes_to_stable_map[pass];
}

u64 bch2_recovery_passes_to_stable(u64 v)
{
	u64 ret = 0;
	for (unsigned i = 0; i < ARRAY_SIZE(passes_to_stable_map); i++)
		if (v & BIT_ULL(i))
			ret |= BIT_ULL(passes_to_stable_map[i]);
	return ret;
}

u64 bch2_recovery_passes_from_stable(u64 v)
{
	static const u8 map[] = {
#define x(n, id, ...)	[BCH_RECOVERY_PASS_STABLE_##n] = BCH_RECOVERY_PASS_##n,
	BCH_RECOVERY_PASSES()
#undef x
	};

	u64 ret = 0;
	for (unsigned i = 0; i < ARRAY_SIZE(map); i++)
		if (v & BIT_ULL(i))
			ret |= BIT_ULL(map[i]);
	return ret;
}

/*
 * For when we need to rewind recovery passes and run a pass we skipped:
 */
int bch2_run_explicit_recovery_pass(struct bch_fs *c,
				    enum bch_recovery_pass pass)
{
	if (c->recovery_passes_explicit & BIT_ULL(pass))
		return 0;

	bch_info(c, "running explicit recovery pass %s (%u), currently at %s (%u)",
		 bch2_recovery_passes[pass], pass,
		 bch2_recovery_passes[c->curr_recovery_pass], c->curr_recovery_pass);

	c->recovery_passes_explicit |= BIT_ULL(pass);

	if (c->curr_recovery_pass >= pass) {
		c->curr_recovery_pass = pass;
		c->recovery_passes_complete &= (1ULL << pass) >> 1;
		return -BCH_ERR_restart_recovery;
	} else {
		return 0;
	}
}

int bch2_run_explicit_recovery_pass_persistent(struct bch_fs *c,
					       enum bch_recovery_pass pass)
{
	enum bch_recovery_pass_stable s = bch2_recovery_pass_to_stable(pass);

	mutex_lock(&c->sb_lock);
	struct bch_sb_field_ext *ext = bch2_sb_field_get(c->disk_sb.sb, ext);

	if (!test_bit_le64(s, ext->recovery_passes_required)) {
		__set_bit_le64(s, ext->recovery_passes_required);
		bch2_write_super(c);
	}
	mutex_unlock(&c->sb_lock);

	return bch2_run_explicit_recovery_pass(c, pass);
}

static void bch2_clear_recovery_pass_required(struct bch_fs *c,
					      enum bch_recovery_pass pass)
{
	enum bch_recovery_pass_stable s = bch2_recovery_pass_to_stable(pass);

	mutex_lock(&c->sb_lock);
	struct bch_sb_field_ext *ext = bch2_sb_field_get(c->disk_sb.sb, ext);

	if (test_bit_le64(s, ext->recovery_passes_required)) {
		__clear_bit_le64(s, ext->recovery_passes_required);
		bch2_write_super(c);
	}
	mutex_unlock(&c->sb_lock);
}

u64 bch2_fsck_recovery_passes(void)
{
	u64 ret = 0;

	for (unsigned i = 0; i < ARRAY_SIZE(recovery_pass_fns); i++)
		if (recovery_pass_fns[i].when & PASS_FSCK)
			ret |= BIT_ULL(i);
	return ret;
}

static bool should_run_recovery_pass(struct bch_fs *c, enum bch_recovery_pass pass)
{
	struct recovery_pass_fn *p = recovery_pass_fns + pass;

	if (c->recovery_passes_explicit & BIT_ULL(pass))
		return true;
	if ((p->when & PASS_FSCK) && c->opts.fsck)
		return true;
	if ((p->when & PASS_UNCLEAN) && !c->sb.clean)
		return true;
	if (p->when & PASS_ALWAYS)
		return true;
	return false;
}

static int bch2_run_recovery_pass(struct bch_fs *c, enum bch_recovery_pass pass)
{
	struct recovery_pass_fn *p = recovery_pass_fns + pass;
	int ret;

	if (!(p->when & PASS_SILENT))
		bch2_print(c, KERN_INFO bch2_log_msg(c, "%s..."),
			   bch2_recovery_passes[pass]);
	ret = p->fn(c);
	if (ret)
		return ret;
	if (!(p->when & PASS_SILENT))
		bch2_print(c, KERN_CONT " done\n");

	return 0;
}

int bch2_run_online_recovery_passes(struct bch_fs *c)
{
	int ret = 0;

	for (unsigned i = 0; i < ARRAY_SIZE(recovery_pass_fns); i++) {
		struct recovery_pass_fn *p = recovery_pass_fns + i;

		if (!(p->when & PASS_ONLINE))
			continue;

		ret = bch2_run_recovery_pass(c, i);
		if (bch2_err_matches(ret, BCH_ERR_restart_recovery)) {
			i = c->curr_recovery_pass;
			continue;
		}
		if (ret)
			break;
	}

	return ret;
}

int bch2_run_recovery_passes(struct bch_fs *c)
{
	int ret = 0;

	while (c->curr_recovery_pass < ARRAY_SIZE(recovery_pass_fns)) {
		if (c->opts.recovery_pass_last &&
		    c->curr_recovery_pass > c->opts.recovery_pass_last)
			break;

		if (should_run_recovery_pass(c, c->curr_recovery_pass)) {
			unsigned pass = c->curr_recovery_pass;

			ret = bch2_run_recovery_pass(c, c->curr_recovery_pass);
			if (bch2_err_matches(ret, BCH_ERR_restart_recovery) ||
			    (ret && c->curr_recovery_pass < pass))
				continue;
			if (ret)
				break;

			c->recovery_passes_complete |= BIT_ULL(c->curr_recovery_pass);
		}

		c->recovery_pass_done = max(c->recovery_pass_done, c->curr_recovery_pass);

		if (!test_bit(BCH_FS_error, &c->flags))
			bch2_clear_recovery_pass_required(c, c->curr_recovery_pass);

		c->curr_recovery_pass++;
	}

	return ret;
}