1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
3 #ifndef CEPH_OS_BLUESTORE_BLUEROCKSENV_H
4 #define CEPH_OS_BLUESTORE_BLUEROCKSENV_H
9 #include "rocksdb/status.h"
10 #include "rocksdb/utilities/env_mirror.h"
12 #include "include/assert.h"
16 class BlueRocksEnv : public rocksdb::EnvWrapper {
17 void split(const std::string &fn, std::string *dir, std::string *file) {
18 size_t slash = fn.rfind('/');
19 *file = fn.substr(slash + 1);
20 while (slash && fn[slash-1] == '/')
22 *dir = fn.substr(0, slash);
26 // Create a brand new sequentially-readable file with the specified name.
27 // On success, stores a pointer to the new file in *result and returns OK.
28 // On failure, stores nullptr in *result and returns non-OK. If the file does
29 // not exist, returns a non-OK status.
31 // The returned file will only be accessed by one thread at a time.
32 rocksdb::Status NewSequentialFile(
33 const std::string& fname,
34 std::unique_ptr<rocksdb::SequentialFile>* result,
35 const rocksdb::EnvOptions& options) override;
37 // Create a brand new random access read-only file with the
38 // specified name. On success, stores a pointer to the new file in
39 // *result and returns OK. On failure, stores nullptr in *result and
40 // returns non-OK. If the file does not exist, returns a non-OK
43 // The returned file may be concurrently accessed by multiple threads.
44 rocksdb::Status NewRandomAccessFile(
45 const std::string& fname,
46 std::unique_ptr<rocksdb::RandomAccessFile>* result,
47 const rocksdb::EnvOptions& options) override;
49 // Create an object that writes to a new file with the specified
50 // name. Deletes any existing file with the same name and creates a
51 // new file. On success, stores a pointer to the new file in
52 // *result and returns OK. On failure, stores nullptr in *result and
55 // The returned file will only be accessed by one thread at a time.
56 rocksdb::Status NewWritableFile(
57 const std::string& fname,
58 std::unique_ptr<rocksdb::WritableFile>* result,
59 const rocksdb::EnvOptions& options) override;
61 // Reuse an existing file by renaming it and opening it as writable.
62 rocksdb::Status ReuseWritableFile(
63 const std::string& fname,
64 const std::string& old_fname,
65 std::unique_ptr<rocksdb::WritableFile>* result,
66 const rocksdb::EnvOptions& options) override;
68 // Create an object that represents a directory. Will fail if directory
69 // doesn't exist. If the directory exists, it will open the directory
70 // and create a new Directory object.
72 // On success, stores a pointer to the new Directory in
73 // *result and returns OK. On failure stores nullptr in *result and
75 rocksdb::Status NewDirectory(
76 const std::string& name,
77 std::unique_ptr<rocksdb::Directory>* result) override;
79 // Returns OK if the named file exists.
80 // NotFound if the named file does not exist,
81 // the calling process does not have permission to determine
82 // whether this file exists, or if the path is invalid.
83 // IOError if an IO Error was encountered
84 rocksdb::Status FileExists(const std::string& fname) override;
86 // Store in *result the names of the children of the specified directory.
87 // The names are relative to "dir".
88 // Original contents of *results are dropped.
89 rocksdb::Status GetChildren(const std::string& dir,
90 std::vector<std::string>* result) override;
92 // Delete the named file.
93 rocksdb::Status DeleteFile(const std::string& fname) override;
95 // Create the specified directory. Returns error if directory exists.
96 rocksdb::Status CreateDir(const std::string& dirname) override;
98 // Create directory if missing. Return Ok if it exists, or successful in
100 rocksdb::Status CreateDirIfMissing(const std::string& dirname) override;
102 // Delete the specified directory.
103 rocksdb::Status DeleteDir(const std::string& dirname) override;
105 // Store the size of fname in *file_size.
106 rocksdb::Status GetFileSize(const std::string& fname, uint64_t* file_size) override;
108 // Store the last modification time of fname in *file_mtime.
109 rocksdb::Status GetFileModificationTime(const std::string& fname,
110 uint64_t* file_mtime) override;
111 // Rename file src to target.
112 rocksdb::Status RenameFile(const std::string& src,
113 const std::string& target) override;
114 // Hard Link file src to target.
115 rocksdb::Status LinkFile(const std::string& src, const std::string& target) override;
117 // Lock the specified file. Used to prevent concurrent access to
118 // the same db by multiple processes. On failure, stores nullptr in
119 // *lock and returns non-OK.
121 // On success, stores a pointer to the object that represents the
122 // acquired lock in *lock and returns OK. The caller should call
123 // UnlockFile(*lock) to release the lock. If the process exits,
124 // the lock will be automatically released.
126 // If somebody else already holds the lock, finishes immediately
127 // with a failure. I.e., this call does not wait for existing locks
130 // May create the named file if it does not already exist.
131 rocksdb::Status LockFile(const std::string& fname, rocksdb::FileLock** lock) override;
133 // Release the lock acquired by a previous successful call to LockFile.
134 // REQUIRES: lock was returned by a successful LockFile() call
135 // REQUIRES: lock has not already been unlocked.
136 rocksdb::Status UnlockFile(rocksdb::FileLock* lock) override;
138 // *path is set to a temporary directory that can be used for testing. It may
139 // or may not have just been created. The directory may or may not differ
140 // between runs of the same process, but subsequent calls will return the
142 rocksdb::Status GetTestDirectory(std::string* path) override;
144 // Create and return a log file for storing informational messages.
145 rocksdb::Status NewLogger(
146 const std::string& fname,
147 std::shared_ptr<rocksdb::Logger>* result) override;
149 // Get full directory name for this db.
150 rocksdb::Status GetAbsolutePath(const std::string& db_path,
151 std::string* output_path) override;
153 explicit BlueRocksEnv(BlueFS *f);