diff options
Diffstat (limited to 'fs/bcachefs/lru.c')
| -rw-r--r-- | fs/bcachefs/lru.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/fs/bcachefs/lru.c b/fs/bcachefs/lru.c new file mode 100644 index 000000000000..10857eccdeaf --- /dev/null +++ b/fs/bcachefs/lru.c @@ -0,0 +1,202 @@ +// 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+#include "btree_write_buffer.h" +#include "error.h" +#include "lru.h" +#include "recovery.h" + +/* KEY_TYPE_lru is obsolete: */ +int bch2_lru_validate(struct bch_fs *c, struct bkey_s_c k, + enum bch_validate_flags flags) +{ + int ret = 0; + + bkey_fsck_err_on(!lru_pos_time(k.k-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 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 bkey_buf *last_flushed) +{ + 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; + + struct bch_dev *ca = bch2_dev_bucket_tryget_noerror(c, alloc_pos); + + if (fsck_err_on(!ca, + trans, lru_entry_to_invalid_bucket, + "lru key points to nonexistent device:bucket %llu:%llu", + alloc_pos.inode, alloc_pos.offset)) + return bch2_btree_bit_mod_buffered(trans, BTREE_ID_lru, lru_iter->pos, false); + + 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 = alloc_lru_idx_fragmentation(*a, ca); + break; + } + + if (lru_k.k->type != KEY_TYPE_set || + 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); + bch2_dev_put(ca); + 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|BCH_TRANS_COMMIT_lazy_rw, + bch2_check_lru_key(trans, &iter, k, &last_flushed))); + + bch2_bkey_buf_exit(&last_flushed, c); + bch_err_fn(c, ret); + return ret; + +} |