--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include <iostream>
+
+#include <boost/intrusive_ptr.hpp>
+#include <boost/smart_ptr/intrusive_ref_counter.hpp>
+
+#include <seastar/core/future.hh>
+
+#include "include/ceph_assert.h"
+#include "include/buffer_fwd.h"
+#include "include/interval_set.h"
+#include "common/interval_map.h"
+
+#include "crimson/osd/exceptions.h"
+
+#include "crimson/os/seastore/cache.h"
+#include "crimson/os/seastore/seastore_types.h"
+#include "crimson/os/seastore/segment_manager.h"
+
+namespace crimson::os::seastore {
+
+/**
+ * Abstract interface for managing the logical to physical mapping
+ */
+class LBAManager {
+public:
+ using mkfs_ertr = crimson::errorator<
+ crimson::ct_error::input_output_error>;
+ using mkfs_ret = mkfs_ertr::future<>;
+ virtual mkfs_ret mkfs(
+ Transaction &t
+ ) = 0;
+
+ /**
+ * Fetches mappings for laddr_t in range [offset, offset + len)
+ *
+ * Future will not resolve until all pins have resolved (set_paddr called)
+ */
+ using get_mapping_ertr = crimson::errorator<
+ crimson::ct_error::input_output_error>;
+ using get_mapping_ret = get_mapping_ertr::future<lba_pin_list_t>;
+ virtual get_mapping_ret get_mapping(
+ Transaction &t,
+ laddr_t offset, extent_len_t length) = 0;
+
+ /**
+ * Fetches mappings for laddr_t in range [offset, offset + len)
+ *
+ * Future will not result until all pins have resolved (set_paddr called)
+ */
+ using get_mappings_ertr = crimson::errorator<
+ crimson::ct_error::input_output_error>;
+ using get_mappings_ret = get_mapping_ertr::future<lba_pin_list_t>;
+ virtual get_mappings_ret get_mappings(
+ Transaction &t,
+ laddr_list_t &&extent_lisk) = 0;
+
+ /**
+ * Allocates a new mapping referenced by LBARef
+ *
+ * Offset will be relative to the block offset of the record
+ * This mapping will block from transaction submission until set_paddr
+ * is called on the LBAPin.
+ */
+ using alloc_extent_ertr = crimson::errorator<
+ crimson::ct_error::input_output_error>;
+ using alloc_extent_ret = alloc_extent_ertr::future<LBAPinRef>;
+ virtual alloc_extent_ret alloc_extent(
+ Transaction &t,
+ laddr_t hint,
+ extent_len_t len,
+ paddr_t addr) = 0;
+
+ /**
+ * Creates a new absolute mapping.
+ *
+ * off~len must be unreferenced
+ */
+ using set_extent_ertr = crimson::errorator<
+ crimson::ct_error::input_output_error,
+ crimson::ct_error::invarg>;
+ using set_extent_ret = set_extent_ertr::future<LBAPinRef>;
+ virtual set_extent_ret set_extent(
+ Transaction &t,
+ laddr_t off, extent_len_t len, paddr_t addr) = 0;
+
+
+ struct ref_update_result_t {
+ unsigned refcount = 0;
+ paddr_t addr;
+ };
+ using ref_ertr = crimson::errorator<
+ crimson::ct_error::enoent,
+ crimson::ct_error::input_output_error>;
+ using ref_ret = ref_ertr::future<ref_update_result_t>;
+
+ /**
+ * Decrements ref count on extent
+ *
+ * @return returns resulting refcount
+ */
+ virtual ref_ret decref_extent(
+ Transaction &t,
+ laddr_t addr) = 0;
+
+ /**
+ * Increments ref count on extent
+ *
+ * @return returns resulting refcount
+ */
+ virtual ref_ret incref_extent(
+ Transaction &t,
+ laddr_t addr) = 0;
+
+ using complete_transaction_ertr = crimson::errorator<
+ crimson::ct_error::input_output_error>;
+ using complete_transaction_ret = complete_transaction_ertr::future<>;
+ virtual complete_transaction_ret complete_transaction(
+ Transaction &t) = 0;
+
+ /**
+ * Should be called after replay on each cached extent.
+ * Implementation must initialize the LBAPin on any
+ * LogicalCachedExtent's and may also read in any dependent
+ * structures, etc.
+ */
+ using init_cached_extent_ertr = crimson::errorator<
+ crimson::ct_error::input_output_error>;
+ using init_cached_extent_ret = init_cached_extent_ertr::future<>;
+ virtual init_cached_extent_ret init_cached_extent(
+ Transaction &t,
+ CachedExtentRef e) = 0;
+
+ /**
+ * Calls f for each mapping in [begin, end)
+ */
+ using scan_mappings_ertr = SegmentManager::read_ertr;
+ using scan_mappings_ret = scan_mappings_ertr::future<>;
+ using scan_mappings_func_t = std::function<
+ void(laddr_t, paddr_t, extent_len_t)>;
+ virtual scan_mappings_ret scan_mappings(
+ Transaction &t,
+ laddr_t begin,
+ laddr_t end,
+ scan_mappings_func_t &&f) = 0;
+
+ /**
+ * Calls f for each mapped space usage in [begin, end)
+ */
+ using scan_mapped_space_ertr = SegmentManager::read_ertr;
+ using scan_mapped_space_ret = scan_mapped_space_ertr::future<>;
+ using scan_mapped_space_func_t = std::function<
+ void(paddr_t, extent_len_t)>;
+ virtual scan_mapped_space_ret scan_mapped_space(
+ Transaction &t,
+ scan_mapped_space_func_t &&f) = 0;
+
+ /**
+ * rewrite_extent
+ *
+ * rewrite extent into passed transaction
+ */
+ using rewrite_extent_ertr = crimson::errorator<
+ crimson::ct_error::input_output_error>;
+ using rewrite_extent_ret = rewrite_extent_ertr::future<>;
+ virtual rewrite_extent_ret rewrite_extent(
+ Transaction &t,
+ CachedExtentRef extent) = 0;
+
+ /**
+ * get_physical_extent_if_live
+ *
+ * Returns extent at addr/laddr if still live (if laddr
+ * still points at addr). Extent must be an internal, physical
+ * extent.
+ *
+ * Returns a null CachedExtentRef if extent is not live.
+ */
+ using get_physical_extent_if_live_ertr = crimson::errorator<
+ crimson::ct_error::input_output_error>;
+ using get_physical_extent_if_live_ret =
+ get_physical_extent_if_live_ertr::future<CachedExtentRef>;
+ virtual get_physical_extent_if_live_ret get_physical_extent_if_live(
+ Transaction &t,
+ extent_types_t type,
+ paddr_t addr,
+ laddr_t laddr,
+ segment_off_t len) = 0;
+
+ virtual void add_pin(LBAPin &pin) = 0;
+
+ virtual ~LBAManager() {}
+};
+using LBAManagerRef = std::unique_ptr<LBAManager>;
+
+class Cache;
+namespace lba_manager {
+LBAManagerRef create_lba_manager(
+ SegmentManager &segment_manager,
+ Cache &cache);
+}
+
+}
projects / ceph.git / blobdiff