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125 lines
2.9 KiB
125 lines
2.9 KiB
package filesys
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import (
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"bytes"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"io"
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"sync"
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)
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type ContinuousDirtyPages struct {
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intervals *ContinuousIntervals
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f *File
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writeWaitGroup sync.WaitGroup
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chunkSaveErrChan chan error
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lock sync.Mutex
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collection string
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replication string
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}
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func newDirtyPages(file *File) *ContinuousDirtyPages {
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return &ContinuousDirtyPages{
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intervals: &ContinuousIntervals{},
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f: file,
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chunkSaveErrChan: make(chan error, 8),
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}
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}
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func (pages *ContinuousDirtyPages) AddPage(offset int64, data []byte) {
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glog.V(4).Infof("%s AddPage [%d,%d) of %d bytes", pages.f.fullpath(), offset, offset+int64(len(data)), pages.f.entry.Attributes.FileSize)
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if len(data) > int(pages.f.wfs.option.ChunkSizeLimit) {
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// this is more than what buffer can hold.
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pages.flushAndSave(offset, data)
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}
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pages.intervals.AddInterval(data, offset)
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if pages.intervals.TotalSize() > pages.f.wfs.option.ChunkSizeLimit {
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pages.saveExistingLargestPageToStorage()
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}
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return
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}
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func (pages *ContinuousDirtyPages) flushAndSave(offset int64, data []byte) {
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// flush existing
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pages.saveExistingPagesToStorage()
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// flush the new page
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pages.saveToStorage(bytes.NewReader(data), offset, int64(len(data)))
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return
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}
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func (pages *ContinuousDirtyPages) saveExistingPagesToStorage() {
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for pages.saveExistingLargestPageToStorage() {
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}
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}
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func (pages *ContinuousDirtyPages) saveExistingLargestPageToStorage() (hasSavedData bool) {
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maxList := pages.intervals.RemoveLargestIntervalLinkedList()
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if maxList == nil {
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return false
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}
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fileSize := int64(pages.f.entry.Attributes.FileSize)
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chunkSize := min(maxList.Size(), fileSize-maxList.Offset())
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if chunkSize == 0 {
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return false
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}
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pages.saveToStorage(maxList.ToReader(), maxList.Offset(), chunkSize)
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return true
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}
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func (pages *ContinuousDirtyPages) saveToStorage(reader io.Reader, offset int64, size int64) {
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pages.writeWaitGroup.Add(1)
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go func() {
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defer pages.writeWaitGroup.Done()
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dir, _ := pages.f.fullpath().DirAndName()
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reader = io.LimitReader(reader, size)
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chunk, collection, replication, err := pages.f.wfs.saveDataAsChunk(dir)(reader, pages.f.Name, offset)
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if err != nil {
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glog.V(0).Infof("%s saveToStorage [%d,%d): %v", pages.f.fullpath(), offset, offset+size, err)
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pages.chunkSaveErrChan <- err
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return
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}
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pages.collection, pages.replication = collection, replication
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pages.f.addChunks([]*filer_pb.FileChunk{chunk})
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pages.chunkSaveErrChan <- nil
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}()
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}
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func maxUint64(x, y uint64) uint64 {
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if x > y {
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return x
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}
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return y
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}
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func max(x, y int64) int64 {
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if x > y {
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return x
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}
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return y
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}
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func min(x, y int64) int64 {
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if x < y {
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return x
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}
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return y
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}
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func (pages *ContinuousDirtyPages) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) {
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return pages.intervals.ReadDataAt(data, startOffset)
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}
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