linux/fs/bcachefs/recovery_passes.c
Kent Overstreet aef7eecb57 bcachefs: Sync journal when we complete a recovery pass
Make things easier when we're debugging long fsck runs - persist the
work that successful recovery passes did.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2024-05-08 17:29:20 -04:00

246 lines
5.8 KiB
C

// 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) ?:
bch2_journal_flush(&c->journal);
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;
}