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diff --git a/src/os/bluestore/BlockDevice.h b/src/os/bluestore/BlockDevice.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2015 XSky <haomai@xsky.com>
+ *
+ * Author: Haomai Wang <haomaiwang@gmail.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#ifndef CEPH_OS_BLUESTORE_BLOCKDEVICE_H
+#define CEPH_OS_BLUESTORE_BLOCKDEVICE_H
+
+#include <atomic>
+#include <condition_variable>
+#include <list>
+#include <map>
+#include <mutex>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "acconfig.h"
+#include "common/ceph_mutex.h"
+
+#if defined(HAVE_LIBAIO) || defined(HAVE_POSIXAIO)
+#include "ceph_aio.h"
+#endif
+#include "include/ceph_assert.h"
+#include "include/buffer.h"
+#include "include/interval_set.h"
+#define SPDK_PREFIX "spdk:"
+
+#if defined(__linux__)
+#if !defined(F_SET_FILE_RW_HINT)
+#define F_LINUX_SPECIFIC_BASE 1024
+#define F_SET_FILE_RW_HINT (F_LINUX_SPECIFIC_BASE + 14)
+#endif
+// These values match Linux definition
+// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/fcntl.h#n56
+#define WRITE_LIFE_NOT_SET 0 // No hint information set
+#define WRITE_LIFE_NONE 1 // No hints about write life time
+#define WRITE_LIFE_SHORT 2 // Data written has a short life time
+#define WRITE_LIFE_MEDIUM 3 // Data written has a medium life time
+#define WRITE_LIFE_LONG 4 // Data written has a long life time
+#define WRITE_LIFE_EXTREME 5 // Data written has an extremely long life time
+#define WRITE_LIFE_MAX 6
+#else
+// On systems don't have WRITE_LIFE_* only use one FD
+// And all files are created equal
+#define WRITE_LIFE_NOT_SET 0 // No hint information set
+#define WRITE_LIFE_NONE 0 // No hints about write life time
+#define WRITE_LIFE_SHORT 0 // Data written has a short life time
+#define WRITE_LIFE_MEDIUM 0 // Data written has a medium life time
+#define WRITE_LIFE_LONG 0 // Data written has a long life time
+#define WRITE_LIFE_EXTREME 0 // Data written has an extremely long life time
+#define WRITE_LIFE_MAX 1
+#endif
+
+class CephContext;
+
+/// track in-flight io
+struct IOContext {
+private:
+ ceph::mutex lock = ceph::make_mutex("IOContext::lock");
+ ceph::condition_variable cond;
+ int r = 0;
+
+public:
+ CephContext* cct;
+ void *priv;
+#ifdef HAVE_SPDK
+ void *nvme_task_first = nullptr;
+ void *nvme_task_last = nullptr;
+ std::atomic_int total_nseg = {0};
+#endif
+
+#if defined(HAVE_LIBAIO) || defined(HAVE_POSIXAIO)
+ std::list<aio_t> pending_aios; ///< not yet submitted
+ std::list<aio_t> running_aios; ///< submitting or submitted
+#endif
+ std::atomic_int num_pending = {0};
+ std::atomic_int num_running = {0};
+ bool allow_eio;
+
+ explicit IOContext(CephContext* cct, void *p, bool allow_eio = false)
+ : cct(cct), priv(p), allow_eio(allow_eio)
+ {}
+
+ // no copying
+ IOContext(const IOContext& other) = delete;
+ IOContext &operator=(const IOContext& other) = delete;
+
+ bool has_pending_aios() {
+ return num_pending.load();
+ }
+ void release_running_aios();
+ void aio_wait();
+ uint64_t get_num_ios() const;
+
+ void try_aio_wake() {
+ assert(num_running >= 1);
+
+ std::lock_guard l(lock);
+ if (num_running.fetch_sub(1) == 1) {
+
+ // we might have some pending IOs submitted after the check
+ // as there is no lock protection for aio_submit.
+ // Hence we might have false conditional trigger.
+ // aio_wait has to handle that hence do not care here.
+ cond.notify_all();
+ }
+ }
+
+ void set_return_value(int _r) {
+ r = _r;
+ }
+
+ int get_return_value() const {
+ return r;
+ }
+};
+
+
+class BlockDevice {
+public:
+ CephContext* cct;
+ typedef void (*aio_callback_t)(void *handle, void *aio);
+private:
+ ceph::mutex ioc_reap_lock = ceph::make_mutex("BlockDevice::ioc_reap_lock");
+ std::vector<IOContext*> ioc_reap_queue;
+ std::atomic_int ioc_reap_count = {0};
+
+protected:
+ uint64_t size;
+ uint64_t block_size;
+ bool support_discard = false;
+ bool rotational = true;
+ bool lock_exclusive = true;
+
+public:
+ aio_callback_t aio_callback;
+ void *aio_callback_priv;
+ BlockDevice(CephContext* cct, aio_callback_t cb, void *cbpriv)
+ : cct(cct),
+ size(0),
+ block_size(0),
+ aio_callback(cb),
+ aio_callback_priv(cbpriv)
+ {}
+ virtual ~BlockDevice() = default;
+
+ static BlockDevice *create(
+ CephContext* cct, const std::string& path, aio_callback_t cb, void *cbpriv, aio_callback_t d_cb, void *d_cbpriv);
+ virtual bool supported_bdev_label() { return true; }
+ virtual bool is_rotational() { return rotational; }
+
+ virtual void aio_submit(IOContext *ioc) = 0;
+
+ void set_no_exclusive_lock() {
+ lock_exclusive = false;
+ }
+
+ uint64_t get_size() const { return size; }
+ uint64_t get_block_size() const { return block_size; }
+
+ /// hook to provide utilization of thinly-provisioned device
+ virtual bool get_thin_utilization(uint64_t *total, uint64_t *avail) const {
+ return false;
+ }
+
+ virtual int collect_metadata(const std::string& prefix, std::map<std::string,std::string> *pm) const = 0;
+
+ virtual int get_devname(std::string *out) {
+ return -ENOENT;
+ }
+ virtual int get_devices(std::set<std::string> *ls) {
+ std::string s;
+ if (get_devname(&s) == 0) {
+ ls->insert(s);
+ }
+ return 0;
+ }
+ virtual int get_numa_node(int *node) const {
+ return -EOPNOTSUPP;
+ }
+
+ virtual int read(
+ uint64_t off,
+ uint64_t len,
+ bufferlist *pbl,
+ IOContext *ioc,
+ bool buffered) = 0;
+ virtual int read_random(
+ uint64_t off,
+ uint64_t len,
+ char *buf,
+ bool buffered) = 0;
+ virtual int write(
+ uint64_t off,
+ bufferlist& bl,
+ bool buffered,
+ int write_hint = WRITE_LIFE_NOT_SET) = 0;
+
+ virtual int aio_read(
+ uint64_t off,
+ uint64_t len,
+ bufferlist *pbl,
+ IOContext *ioc) = 0;
+ virtual int aio_write(
+ uint64_t off,
+ bufferlist& bl,
+ IOContext *ioc,
+ bool buffered,
+ int write_hint = WRITE_LIFE_NOT_SET) = 0;
+ virtual int flush() = 0;
+ virtual int discard(uint64_t offset, uint64_t len) { return 0; }
+ virtual int queue_discard(interval_set<uint64_t> &to_release) { return -1; }
+ virtual void discard_drain() { return; }
+
+ void queue_reap_ioc(IOContext *ioc);
+ void reap_ioc();
+
+ // for managing buffered readers/writers
+ virtual int invalidate_cache(uint64_t off, uint64_t len) = 0;
+ virtual int open(const std::string& path) = 0;
+ virtual void close() = 0;
+
+protected:
+ bool is_valid_io(uint64_t off, uint64_t len) const {
+ return (off % block_size == 0 &&
+ len % block_size == 0 &&
+ len > 0 &&
+ off < size &&
+ off + len <= size);
+ }
+};
+
+#endif //CEPH_OS_BLUESTORE_BLOCKDEVICE_H
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 17:59:44 +0000