mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-03 00:49:13 +08:00
294 lines
7.7 KiB
Go
294 lines
7.7 KiB
Go
package filesys
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import (
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"context"
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"fmt"
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"io"
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"math"
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"net/http"
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"os"
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"sync"
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"time"
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"github.com/seaweedfs/fuse"
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"github.com/seaweedfs/fuse/fs"
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"github.com/chrislusf/seaweedfs/weed/filer"
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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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)
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type FileHandle struct {
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// cache file has been written to
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dirtyPages *ContinuousDirtyPages
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contentType string
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handle uint64
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sync.RWMutex
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f *File
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RequestId fuse.RequestID // unique ID for request
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NodeId fuse.NodeID // file or directory the request is about
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Uid uint32 // user ID of process making request
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Gid uint32 // group ID of process making request
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}
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func newFileHandle(file *File, uid, gid uint32) *FileHandle {
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fh := &FileHandle{
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f: file,
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dirtyPages: newDirtyPages(file),
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Uid: uid,
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Gid: gid,
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}
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if fh.f.entry != nil {
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fh.f.entry.Attributes.FileSize = filer.FileSize(fh.f.entry)
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}
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return fh
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}
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var _ = fs.Handle(&FileHandle{})
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// var _ = fs.HandleReadAller(&FileHandle{})
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var _ = fs.HandleReader(&FileHandle{})
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var _ = fs.HandleFlusher(&FileHandle{})
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var _ = fs.HandleWriter(&FileHandle{})
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var _ = fs.HandleReleaser(&FileHandle{})
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func (fh *FileHandle) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
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glog.V(4).Infof("%s read fh %d: [%d,%d) size %d resp.Data cap=%d", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(req.Size), req.Size, cap(resp.Data))
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fh.RLock()
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defer fh.RUnlock()
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if req.Size <= 0 {
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return nil
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}
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buff := resp.Data[:cap(resp.Data)]
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if req.Size > cap(resp.Data) {
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// should not happen
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buff = make([]byte, req.Size)
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}
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totalRead, err := fh.readFromChunks(buff, req.Offset)
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if err == nil {
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maxStop := fh.readFromDirtyPages(buff, req.Offset)
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totalRead = max(maxStop-req.Offset, totalRead)
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}
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if err == io.EOF {
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err = nil
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}
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if err != nil {
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glog.Warningf("file handle read %s %d: %v", fh.f.fullpath(), totalRead, err)
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return fuse.EIO
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}
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if totalRead > int64(len(buff)) {
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glog.Warningf("%s FileHandle Read %d: [%d,%d) size %d totalRead %d", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(req.Size), req.Size, totalRead)
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totalRead = min(int64(len(buff)), totalRead)
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}
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// resp.Data = buff[:totalRead]
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resp.Data = buff
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return err
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}
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func (fh *FileHandle) readFromDirtyPages(buff []byte, startOffset int64) (maxStop int64) {
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maxStop = fh.dirtyPages.ReadDirtyDataAt(buff, startOffset)
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return
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}
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func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) {
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fileSize := int64(filer.FileSize(fh.f.entry))
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if fileSize == 0 {
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glog.V(1).Infof("empty fh %v", fh.f.fullpath())
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return 0, io.EOF
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}
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var chunkResolveErr error
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if fh.f.entryViewCache == nil {
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fh.f.entryViewCache, chunkResolveErr = filer.NonOverlappingVisibleIntervals(filer.LookupFn(fh.f.wfs), fh.f.entry.Chunks)
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if chunkResolveErr != nil {
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return 0, fmt.Errorf("fail to resolve chunk manifest: %v", chunkResolveErr)
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}
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fh.f.reader = nil
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}
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if fh.f.reader == nil {
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chunkViews := filer.ViewFromVisibleIntervals(fh.f.entryViewCache, 0, math.MaxInt64)
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fh.f.reader = filer.NewChunkReaderAtFromClient(fh.f.wfs, chunkViews, fh.f.wfs.chunkCache, fileSize)
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}
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totalRead, err := fh.f.reader.ReadAt(buff, offset)
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if err != nil && err != io.EOF{
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glog.Errorf("file handle read %s: %v", fh.f.fullpath(), err)
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}
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glog.V(4).Infof("file handle read %s [%d,%d] %d : %v", fh.f.fullpath(), offset, offset+int64(totalRead), totalRead, err)
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return int64(totalRead), err
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}
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// Write to the file handle
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func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
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fh.Lock()
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defer fh.Unlock()
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// write the request to volume servers
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data := req.Data
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fh.f.entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(data)), int64(fh.f.entry.Attributes.FileSize)))
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glog.V(4).Infof("%v write [%d,%d) %d", fh.f.fullpath(), req.Offset, req.Offset+int64(len(req.Data)), len(req.Data))
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fh.dirtyPages.AddPage(req.Offset, data)
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resp.Size = len(data)
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if req.Offset == 0 {
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// detect mime type
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fh.contentType = http.DetectContentType(data)
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fh.f.dirtyMetadata = true
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}
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fh.f.dirtyMetadata = true
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return nil
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}
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func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) error {
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glog.V(4).Infof("Release %v fh %d", fh.f.fullpath(), fh.handle)
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fh.Lock()
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defer fh.Unlock()
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fh.f.isOpen--
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if fh.f.isOpen < 0 {
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glog.V(0).Infof("Release reset %s open count %d => %d", fh.f.Name, fh.f.isOpen, 0)
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fh.f.isOpen = 0
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return nil
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}
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if fh.f.isOpen == 0 {
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if err := fh.doFlush(ctx, req.Header); err != nil {
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glog.Errorf("Release doFlush %s: %v", fh.f.Name, err)
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}
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fh.f.wfs.ReleaseHandle(fh.f.fullpath(), fuse.HandleID(fh.handle))
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}
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// stop the goroutine
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if !fh.dirtyPages.chunkSaveErrChanClosed {
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fh.dirtyPages.chunkSaveErrChanClosed = true
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close(fh.dirtyPages.chunkSaveErrChan)
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}
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return nil
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}
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func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) error {
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fh.Lock()
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defer fh.Unlock()
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return fh.doFlush(ctx, req.Header)
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}
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func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error {
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// flush works at fh level
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// send the data to the OS
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glog.V(4).Infof("doFlush %s fh %d", fh.f.fullpath(), fh.handle)
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fh.dirtyPages.saveExistingPagesToStorage()
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var err error
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go func() {
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for t := range fh.dirtyPages.chunkSaveErrChan {
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if t != nil {
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err = t
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}
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}
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}()
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fh.dirtyPages.writeWaitGroup.Wait()
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if err != nil {
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return err
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}
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if !fh.f.dirtyMetadata {
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return nil
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}
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err = fh.f.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
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if fh.f.entry.Attributes != nil {
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fh.f.entry.Attributes.Mime = fh.contentType
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if fh.f.entry.Attributes.Uid == 0 {
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fh.f.entry.Attributes.Uid = header.Uid
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}
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if fh.f.entry.Attributes.Gid == 0 {
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fh.f.entry.Attributes.Gid = header.Gid
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}
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if fh.f.entry.Attributes.Crtime == 0 {
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fh.f.entry.Attributes.Crtime = time.Now().Unix()
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}
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fh.f.entry.Attributes.Mtime = time.Now().Unix()
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fh.f.entry.Attributes.FileMode = uint32(os.FileMode(fh.f.entry.Attributes.FileMode) &^ fh.f.wfs.option.Umask)
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fh.f.entry.Attributes.Collection = fh.dirtyPages.collection
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fh.f.entry.Attributes.Replication = fh.dirtyPages.replication
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}
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request := &filer_pb.CreateEntryRequest{
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Directory: fh.f.dir.FullPath(),
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Entry: fh.f.entry,
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Signatures: []int32{fh.f.wfs.signature},
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}
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glog.V(4).Infof("%s set chunks: %v", fh.f.fullpath(), len(fh.f.entry.Chunks))
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for i, chunk := range fh.f.entry.Chunks {
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glog.V(4).Infof("%s chunks %d: %v [%d,%d)", fh.f.fullpath(), i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size))
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}
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manifestChunks, nonManifestChunks := filer.SeparateManifestChunks(fh.f.entry.Chunks)
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chunks, _ := filer.CompactFileChunks(filer.LookupFn(fh.f.wfs), nonManifestChunks)
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chunks, manifestErr := filer.MaybeManifestize(fh.f.wfs.saveDataAsChunk(fh.f.dir.FullPath()), chunks)
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if manifestErr != nil {
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// not good, but should be ok
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glog.V(0).Infof("MaybeManifestize: %v", manifestErr)
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}
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fh.f.entry.Chunks = append(chunks, manifestChunks...)
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fh.f.entryViewCache = nil
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fh.f.wfs.mapPbIdFromLocalToFiler(request.Entry)
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defer fh.f.wfs.mapPbIdFromFilerToLocal(request.Entry)
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if err := filer_pb.CreateEntry(client, request); err != nil {
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glog.Errorf("fh flush create %s: %v", fh.f.fullpath(), err)
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return fmt.Errorf("fh flush create %s: %v", fh.f.fullpath(), err)
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}
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fh.f.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry))
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return nil
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})
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if err == nil {
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fh.f.dirtyMetadata = false
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}
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if err != nil {
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glog.Errorf("%v fh %d flush: %v", fh.f.fullpath(), fh.handle, err)
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return fuse.EIO
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}
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return nil
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}
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