move Rust sources to top level, C sources into c_src

[bcachefs-tools-debian] / c_src / libbcachefs / lru.c

diff --git a/c_src/libbcachefs/lru.c b/c_src/libbcachefs/lru.c
new file mode 100644 (file)
index 0000000..7a4ca5a
--- /dev/null
+++ b/c_src/libbcachefs/lru.c
@@ -0,0 +1,159 @@
+// 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+/* KEY_TYPE_lru is obsolete: */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 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;
+
+}