mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-27 11:43:49 +00:00
6c1b040cc9
Summary: Store links to live files in directory on same disk Test Plan: Take snapshot and open it. Added a test GetSnapshotLink in db_test. Reviewers: sdong Reviewed By: sdong Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D28713
60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
//
|
|
#include <string>
|
|
#include <algorithm>
|
|
#include "util/file_util.h"
|
|
#include "rocksdb/env.h"
|
|
#include "db/filename.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
// Utility function to copy a file up to a specified length
|
|
Status CopyFile(Env* env, const std::string& source,
|
|
const std::string& destination, uint64_t size) {
|
|
const EnvOptions soptions;
|
|
unique_ptr<SequentialFile> srcfile;
|
|
Status s;
|
|
s = env->NewSequentialFile(source, &srcfile, soptions);
|
|
unique_ptr<WritableFile> destfile;
|
|
if (s.ok()) {
|
|
s = env->NewWritableFile(destination, &destfile, soptions);
|
|
} else {
|
|
return s;
|
|
}
|
|
|
|
if (size == 0) {
|
|
// default argument means copy everything
|
|
if (s.ok()) {
|
|
s = env->GetFileSize(source, &size);
|
|
} else {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
char buffer[4096];
|
|
Slice slice;
|
|
while (size > 0) {
|
|
uint64_t bytes_to_read =
|
|
std::min(static_cast<uint64_t>(sizeof(buffer)), size);
|
|
if (s.ok()) {
|
|
s = srcfile->Read(bytes_to_read, &slice, buffer);
|
|
}
|
|
if (s.ok()) {
|
|
if (slice.size() == 0) {
|
|
return Status::Corruption("file too small");
|
|
}
|
|
s = destfile->Append(slice);
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
size -= slice.size();
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
} // namespace rocksdb
|