134 lines
4.2 KiB
C++
134 lines
4.2 KiB
C++
/*
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* IAsyncFile.actor.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "IAsyncFile.h"
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#include "flow/Error.h"
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#include "flow/Knobs.h"
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#include "flow/Platform.h"
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#include "flow/UnitTest.h"
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#include <iostream>
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IAsyncFile::~IAsyncFile() = default;
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const static unsigned int ONE_MEGABYTE = 1<<20;
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const static unsigned int FOUR_KILOBYTES = 4<<10;
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ACTOR static Future<Void> zeroRangeHelper( Reference<IAsyncFile> f, int64_t offset, int64_t length, int fixedbyte) {
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state int64_t pos = offset;
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state void* zeros = aligned_alloc( ONE_MEGABYTE, ONE_MEGABYTE );
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memset( zeros, fixedbyte, ONE_MEGABYTE );
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while(pos < offset+length) {
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state int len = std::min<int64_t>( ONE_MEGABYTE, offset+length-pos );
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Void _ = wait( f->write( zeros, len, pos ) );
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pos += len;
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Void _ = wait( yield() );
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}
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aligned_free(zeros);
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return Void();
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}
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Future<Void> IAsyncFile::zeroRange(int64_t offset, int64_t length) {
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return uncancellable(zeroRangeHelper(Reference<IAsyncFile>::addRef(this), offset, length, 0));
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}
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TEST_CASE( "fileio/zero" ) {
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state std::string filename = "/tmp/__ZEROJUNK__";
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state Reference<IAsyncFile> f =
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wait(IAsyncFileSystem::filesystem()->open(
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filename,
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IAsyncFile::OPEN_ATOMIC_WRITE_AND_CREATE | IAsyncFile::OPEN_CREATE | IAsyncFile::OPEN_READWRITE,
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0));
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// Verify that we can grow a file with zero().
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Void _ = wait(f->sync());
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Void _ = wait(f->zeroRange(0, ONE_MEGABYTE));
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int64_t size = wait(f->size());
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ASSERT( ONE_MEGABYTE == size );
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// Verify that zero() does, in fact, zero.
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Void _ = wait(zeroRangeHelper(f, 0, ONE_MEGABYTE, 0xff));
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Void _ = wait(f->zeroRange(0, ONE_MEGABYTE));
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state uint8_t* page = (uint8_t*)malloc(FOUR_KILOBYTES);
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int n = wait( f->read(page, FOUR_KILOBYTES, 0) );
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ASSERT( n == FOUR_KILOBYTES );
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for (int i = 0; i < FOUR_KILOBYTES; i++) {
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ASSERT(page[i] == 0);
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}
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free(page);
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// Destruct our file and remove it.
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f.clear();
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Void _ = wait( IAsyncFileSystem::filesystem()->deleteFile(filename, true) );
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return Void();
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}
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ACTOR static Future<Void> incrementalDeleteHelper( std::string filename, bool mustBeDurable, int64_t truncateAmt, double interval ) {
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state Reference<IAsyncFile> file;
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state int64_t remainingFileSize;
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state bool exists = fileExists(filename);
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if(exists) {
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Reference<IAsyncFile> f = wait(IAsyncFileSystem::filesystem()->open(filename, IAsyncFile::OPEN_READWRITE | IAsyncFile::OPEN_UNCACHED, 0));
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file = f;
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int64_t fileSize = wait(file->size());
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remainingFileSize = fileSize;
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}
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Void _ = wait(IAsyncFileSystem::filesystem()->deleteFile(filename, mustBeDurable));
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if(exists) {
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for( ; remainingFileSize > 0; remainingFileSize -= truncateAmt ){
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Void _ = wait(file->truncate(remainingFileSize));
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Void _ = wait(file->sync());
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Void _ = wait(delay(interval));
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}
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}
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return Void();
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}
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Future<Void> IAsyncFileSystem::incrementalDeleteFile( std::string filename, bool mustBeDurable ) {
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return uncancellable(incrementalDeleteHelper(
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filename,
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mustBeDurable,
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FLOW_KNOBS->INCREMENTAL_DELETE_TRUNCATE_AMOUNT,
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FLOW_KNOBS->INCREMENTAL_DELETE_INTERVAL));
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}
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TEST_CASE( "fileio/incrementalDelete" ) {
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//about 5GB
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state int64_t fileSize = 5e9;
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state std::string filename = "/tmp/__JUNK__";
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state Reference<IAsyncFile> f =
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wait(IAsyncFileSystem::filesystem()->open(
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filename,
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IAsyncFile::OPEN_ATOMIC_WRITE_AND_CREATE | IAsyncFile::OPEN_CREATE | IAsyncFile::OPEN_READWRITE,
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0));
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Void _ = wait(f->sync());
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Void _ = wait(f->truncate(fileSize));
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//close the file by deleting the reference
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f.clear();
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Void _ = wait(IAsyncFileSystem::filesystem()->incrementalDeleteFile(filename, true));
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return Void();
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}
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