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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/* KEY_TYPE_lru is obsolete: */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(struct bch_fs *c, struct bkey_s_c k,
enum bch_validate_flags flags,
struct printbuf *err)
{
int ret = 0;
bkey_fsck_err_on(!lru_pos_time(k.k->p), c, err,
lru_entry_at_time_0,
"lru entry at time=0");
fsck_err:
return ret;
}
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, bool set)
{
return time
? bch2_btree_bit_mod_buffered(trans, BTREE_ID_lru,
lru_pos(lru_id, dev_bucket, time), set)
: 0;
}
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
};
int bch2_lru_check_set(struct btree_trans *trans,
u16 lru_id, u64 time,
struct bkey_s_c referring_k,
struct bkey_buf *last_flushed)
{
struct bch_fs *c = trans->c;
struct printbuf buf = PRINTBUF;
struct btree_iter lru_iter;
struct bkey_s_c lru_k =
bch2_bkey_get_iter(trans, &lru_iter, BTREE_ID_lru,
lru_pos(lru_id,
bucket_to_u64(referring_k.k->p),
time), 0);
int ret = bkey_err(lru_k);
if (ret)
return ret;
if (lru_k.k->type != KEY_TYPE_set) {
ret = bch2_btree_write_buffer_maybe_flush(trans, referring_k, last_flushed);
if (ret)
goto err;
if (fsck_err(trans, alloc_key_to_missing_lru_entry,
"missing %s lru entry\n"
" %s",
bch2_lru_types[lru_type(lru_k)],
(bch2_bkey_val_to_text(&buf, c, referring_k), buf.buf))) {
ret = bch2_lru_set(trans, lru_id, bucket_to_u64(referring_k.k->p), time);
if (ret)
goto err;
}
}
err:
fsck_err:
bch2_trans_iter_exit(trans, &lru_iter);
printbuf_exit(&buf);
return ret;
}
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),
trans, lru_entry_to_invalid_bucket,
"lru key points to nonexistent device:bucket %llu:%llu",
alloc_pos.inode, alloc_pos.offset))
return bch2_btree_delete_at(trans, lru_iter, 0);
k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_alloc, alloc_pos, 0);
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 (fsck_err(trans, lru_entry_bad,
"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 bpos last_flushed_pos = POS_MIN;
int ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter,
BTREE_ID_lru, POS_MIN, BTREE_ITER_prefetch, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc|BCH_TRANS_COMMIT_lazy_rw,
bch2_check_lru_key(trans, &iter, k, &last_flushed_pos)));
bch_err_fn(c, ret);
return ret;
}
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