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-rw-r--r--fs/bcachefs/lru.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/fs/bcachefs/lru.c b/fs/bcachefs/lru.c
new file mode 100644
index 0000000000..a5cc0ed195
--- /dev/null
+++ b/fs/bcachefs/lru.c
@@ -0,0 +1,164 @@
+// 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+/* KEY_TYPE_lru is obsolete: */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 bkey_invalid_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(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
+};
+
+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_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 (c->opts.reconstruct_alloc ||
+ fsck_err(c, 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 btree_iter iter;
+ struct bkey_s_c k;
+ struct bpos last_flushed_pos = POS_MIN;
+ int ret = 0;
+
+ ret = bch2_trans_run(c,
+ 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)));
+ if (ret)
+ bch_err_fn(c, ret);
+ return ret;
+
+}