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// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "alloc_background.h"
#include "bkey_buf.h"
#include "btree_iter.h"
#include "btree_update.h"
#include "btree_write_buffer.h"
#include "ec.h"
#include "error.h"
#include "lru.h"
#include "recovery.h"
/* KEY_TYPE_lru is obsolete: */
int bch2_lru_validate(struct bch_fs *c, struct bkey_s_c k,
struct bkey_validate_context from)
{
int ret = 0;
bkey_fsck_err_on(!lru_pos_time(k.k->p),
c, 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 dev_bucket,
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, dev_bucket, 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, dev_bucket, time);
if (ret)
goto err;
}
}
err:
fsck_err:
bch2_trans_iter_exit(trans, &lru_iter);
printbuf_exit(&buf);
return ret;
}
static struct bbpos lru_pos_to_bp(struct bkey_s_c lru_k)
{
enum bch_lru_type type = lru_type(lru_k);
switch (type) {
case BCH_LRU_read:
case BCH_LRU_fragmentation:
return BBPOS(BTREE_ID_alloc, u64_to_bucket(lru_k.k->p.offset));
case BCH_LRU_stripes:
return BBPOS(BTREE_ID_stripes, POS(0, lru_k.k->p.offset));
default:
BUG();
}
}
static u64 bkey_lru_type_idx(struct bch_fs *c,
enum bch_lru_type type,
struct bkey_s_c k)
{
struct bch_alloc_v4 a_convert;
const struct bch_alloc_v4 *a;
switch (type) {
case BCH_LRU_read:
a = bch2_alloc_to_v4(k, &a_convert);
return alloc_lru_idx_read(*a);
case BCH_LRU_fragmentation: {
a = bch2_alloc_to_v4(k, &a_convert);
guard(rcu)();
struct bch_dev *ca = bch2_dev_rcu_noerror(c, k.k->p.inode);
return ca
? alloc_lru_idx_fragmentation(*a, ca)
: 0;
}
case BCH_LRU_stripes:
return k.k->type == KEY_TYPE_stripe
? stripe_lru_pos(bkey_s_c_to_stripe(k).v)
: 0;
default:
BUG();
}
}
static int bch2_check_lru_key(struct btree_trans *trans,
struct btree_iter *lru_iter,
struct bkey_s_c lru_k,
struct bkey_buf *last_flushed)
{
struct bch_fs *c = trans->c;
struct printbuf buf1 = PRINTBUF;
struct printbuf buf2 = PRINTBUF;
struct bbpos bp = lru_pos_to_bp(lru_k);
struct btree_iter iter;
struct bkey_s_c k = bch2_bkey_get_iter(trans, &iter, bp.btree, bp.pos, 0);
int ret = bkey_err(k);
if (ret)
goto err;
enum bch_lru_type type = lru_type(lru_k);
u64 idx = bkey_lru_type_idx(c, type, k);
if (lru_pos_time(lru_k.k->p) != idx) {
ret = bch2_btree_write_buffer_maybe_flush(trans, lru_k, last_flushed);
if (ret)
goto err;
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_bit_mod_buffered(trans, BTREE_ID_lru, lru_iter->pos, false);
}
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 bkey_buf last_flushed;
bch2_bkey_buf_init(&last_flushed);
bkey_init(&last_flushed.k->k);
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,
bch2_check_lru_key(trans, &iter, k, &last_flushed)));
bch2_bkey_buf_exit(&last_flushed, c);
bch_err_fn(c, ret);
return ret;
}
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