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// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "alloc_background.h"
#include "btree_iter.h"
#include "btree_update.h"
#include "btree_write_buffer.h"
#include "error.h"
#include "lru.h"
#include "recovery.h"
/* KEY_TYPE_lru is obsolete: */
int bch2_lru_invalid(const struct bch_fs *c, struct bkey_s_c k,
unsigned flags, struct printbuf *err)
{
if (!lru_pos_time(k.k->p)) {
prt_printf(err, "lru entry at time=0");
return -BCH_ERR_invalid_bkey;
}
return 0;
}
void bch2_lru_to_text(struct printbuf *out, struct bch_fs *c,
struct bkey_s_c k)
{
const struct bch_lru *lru = bkey_s_c_to_lru(k).v;
prt_printf(out, "idx %llu", le64_to_cpu(lru->idx));
}
void bch2_lru_pos_to_text(struct printbuf *out, struct bpos lru)
{
prt_printf(out, "%llu:%llu -> %llu:%llu",
lru_pos_id(lru),
lru_pos_time(lru),
u64_to_bucket(lru.offset).inode,
u64_to_bucket(lru.offset).offset);
}
static int __bch2_lru_set(struct btree_trans *trans, u16 lru_id,
u64 dev_bucket, u64 time, unsigned key_type)
{
struct bkey_i *k;
int ret = 0;
if (!time)
return 0;
k = bch2_trans_kmalloc_nomemzero(trans, sizeof(*k));
ret = PTR_ERR_OR_ZERO(k);
if (unlikely(ret))
return ret;
bkey_init(&k->k);
k->k.type = key_type;
k->k.p = lru_pos(lru_id, dev_bucket, time);
EBUG_ON(lru_pos_id(k->k.p) != lru_id);
EBUG_ON(lru_pos_time(k->k.p) != time);
EBUG_ON(k->k.p.offset != dev_bucket);
return bch2_trans_update_buffered(trans, BTREE_ID_lru, k);
}
int bch2_lru_del(struct btree_trans *trans, u16 lru_id, u64 dev_bucket, u64 time)
{
return __bch2_lru_set(trans, lru_id, dev_bucket, time, KEY_TYPE_deleted);
}
int bch2_lru_set(struct btree_trans *trans, u16 lru_id, u64 dev_bucket, u64 time)
{
return __bch2_lru_set(trans, lru_id, dev_bucket, time, KEY_TYPE_set);
}
int bch2_lru_change(struct btree_trans *trans,
u16 lru_id, u64 dev_bucket,
u64 old_time, u64 new_time)
{
if (old_time == new_time)
return 0;
return bch2_lru_del(trans, lru_id, dev_bucket, old_time) ?:
bch2_lru_set(trans, lru_id, dev_bucket, new_time);
}
static const char * const bch2_lru_types[] = {
#define x(n) #n,
BCH_LRU_TYPES()
#undef x
NULL
};
static int bch2_check_lru_key(struct btree_trans *trans,
struct btree_iter *lru_iter,
struct bkey_s_c lru_k,
struct bpos *last_flushed_pos)
{
struct bch_fs *c = trans->c;
struct btree_iter iter;
struct bkey_s_c k;
struct bch_alloc_v4 a_convert;
const struct bch_alloc_v4 *a;
struct printbuf buf1 = PRINTBUF;
struct printbuf buf2 = PRINTBUF;
enum bch_lru_type type = lru_type(lru_k);
struct bpos alloc_pos = u64_to_bucket(lru_k.k->p.offset);
u64 idx;
int ret;
if (fsck_err_on(!bch2_dev_bucket_exists(c, alloc_pos), c,
"lru key points to nonexistent device:bucket %llu:%llu",
alloc_pos.inode, alloc_pos.offset))
return bch2_btree_delete_at(trans, lru_iter, 0);
bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc, alloc_pos, 0);
k = bch2_btree_iter_peek_slot(&iter);
ret = bkey_err(k);
if (ret)
goto err;
a = bch2_alloc_to_v4(k, &a_convert);
switch (type) {
case BCH_LRU_read:
idx = alloc_lru_idx_read(*a);
break;
case BCH_LRU_fragmentation:
idx = a->fragmentation_lru;
break;
}
if (lru_k.k->type != KEY_TYPE_set ||
lru_pos_time(lru_k.k->p) != idx) {
if (!bpos_eq(*last_flushed_pos, lru_k.k->p)) {
*last_flushed_pos = lru_k.k->p;
ret = bch2_btree_write_buffer_flush_sync(trans) ?:
-BCH_ERR_transaction_restart_write_buffer_flush;
goto out;
}
if (c->opts.reconstruct_alloc ||
fsck_err(c, "incorrect lru entry: lru %s time %llu\n"
" %s\n"
" for %s",
bch2_lru_types[type],
lru_pos_time(lru_k.k->p),
(bch2_bkey_val_to_text(&buf1, c, lru_k), buf1.buf),
(bch2_bkey_val_to_text(&buf2, c, k), buf2.buf)))
ret = bch2_btree_delete_at(trans, lru_iter, 0);
}
out:
err:
fsck_err:
bch2_trans_iter_exit(trans, &iter);
printbuf_exit(&buf2);
printbuf_exit(&buf1);
return ret;
}
int bch2_check_lrus(struct bch_fs *c)
{
struct btree_trans trans;
struct btree_iter iter;
struct bkey_s_c k;
struct bpos last_flushed_pos = POS_MIN;
int ret = 0;
bch2_trans_init(&trans, c, 0, 0);
ret = for_each_btree_key_commit(&trans, iter,
BTREE_ID_lru, POS_MIN, BTREE_ITER_PREFETCH, k,
NULL, NULL, BTREE_INSERT_NOFAIL|BTREE_INSERT_LAZY_RW,
bch2_check_lru_key(&trans, &iter, k, &last_flushed_pos));
bch2_trans_exit(&trans);
return ret;
}
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