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package filesys
import ( "bytes" "io" "runtime" "sync" "time"
"github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" )
var ( concurrentWriterLimit = runtime.NumCPU() )
type ContinuousDirtyPages struct { intervals *ContinuousIntervals f *File writeWaitGroup sync.WaitGroup chunkSaveErrChan chan error chunkSaveErrChanClosed bool lastErr error lock sync.Mutex collection string replication string }
func newDirtyPages(file *File) *ContinuousDirtyPages { dirtyPages := &ContinuousDirtyPages{ intervals: &ContinuousIntervals{}, f: file, chunkSaveErrChan: make(chan error, concurrentWriterLimit), } go func() { for t := range dirtyPages.chunkSaveErrChan { if t != nil { dirtyPages.lastErr = t } } }() return dirtyPages }
func (pages *ContinuousDirtyPages) AddPage(offset int64, data []byte) {
glog.V(4).Infof("%s AddPage [%d,%d) of %d bytes", pages.f.fullpath(), offset, offset+int64(len(data)), pages.f.entry.Attributes.FileSize)
if len(data) > int(pages.f.wfs.option.ChunkSizeLimit) { // this is more than what buffer can hold.
pages.flushAndSave(offset, data) }
pages.intervals.AddInterval(data, offset)
if pages.intervals.TotalSize() >= pages.f.wfs.option.ChunkSizeLimit { pages.saveExistingLargestPageToStorage() }
return }
func (pages *ContinuousDirtyPages) flushAndSave(offset int64, data []byte) {
// flush existing
pages.saveExistingPagesToStorage()
// flush the new page
pages.saveToStorage(bytes.NewReader(data), offset, int64(len(data)))
return }
func (pages *ContinuousDirtyPages) saveExistingPagesToStorage() { for pages.saveExistingLargestPageToStorage() { } }
func (pages *ContinuousDirtyPages) saveExistingLargestPageToStorage() (hasSavedData bool) {
maxList := pages.intervals.RemoveLargestIntervalLinkedList() if maxList == nil { return false }
fileSize := int64(pages.f.entry.Attributes.FileSize)
chunkSize := min(maxList.Size(), fileSize-maxList.Offset()) if chunkSize == 0 { return false }
pages.saveToStorage(maxList.ToReader(), maxList.Offset(), chunkSize)
maxList.Destroy()
return true }
func (pages *ContinuousDirtyPages) saveToStorage(reader io.Reader, offset int64, size int64) {
if pages.chunkSaveErrChanClosed { pages.chunkSaveErrChan = make(chan error, concurrentWriterLimit) pages.chunkSaveErrChanClosed = false }
mtime := time.Now().UnixNano() pages.writeWaitGroup.Add(1) go func() { defer pages.writeWaitGroup.Done()
dir, _ := pages.f.fullpath().DirAndName()
reader = io.LimitReader(reader, size) chunk, collection, replication, err := pages.f.wfs.saveDataAsChunk(dir)(reader, pages.f.Name, offset) if err != nil { glog.V(0).Infof("%s saveToStorage [%d,%d): %v", pages.f.fullpath(), offset, offset+size, err) pages.chunkSaveErrChan <- err return } chunk.Mtime = mtime pages.collection, pages.replication = collection, replication pages.f.addChunks([]*filer_pb.FileChunk{chunk}) glog.V(3).Infof("%s saveToStorage [%d,%d)", pages.f.fullpath(), offset, offset+size) }() }
func max(x, y int64) int64 { if x > y { return x } return y } func min(x, y int64) int64 { if x < y { return x } return y }
func (pages *ContinuousDirtyPages) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) { return pages.intervals.ReadDataAt(data, startOffset) }
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