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package filesys
import (
"context"
"fmt"
"io"
"math"
"net/http"
"os"
"time"
"github.com/seaweedfs/fuse"
"github.com/seaweedfs/fuse/fs"
"github.com/chrislusf/seaweedfs/weed/filer2"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
)
type FileHandle struct {
// cache file has been written to
dirtyPages *ContinuousDirtyPages
contentType string
handle uint64
f *File
RequestId fuse.RequestID // unique ID for request
NodeId fuse.NodeID // file or directory the request is about
Uid uint32 // user ID of process making request
Gid uint32 // group ID of process making request
}
func newFileHandle(file *File, uid, gid uint32) *FileHandle {
fh := &FileHandle{
f: file,
dirtyPages: newDirtyPages(file),
Uid: uid,
Gid: gid,
}
if fh.f.entry != nil {
fh.f.entry.Attributes.FileSize = filer2.FileSize(fh.f.entry)
}
return fh
}
var _ = fs.Handle(&FileHandle{})
// var _ = fs.HandleReadAller(&FileHandle{})
var _ = fs.HandleReader(&FileHandle{})
var _ = fs.HandleFlusher(&FileHandle{})
var _ = fs.HandleWriter(&FileHandle{})
var _ = fs.HandleReleaser(&FileHandle{})
func (fh *FileHandle) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
glog.V(4).Infof("%s read fh %d: [%d,%d) size %d resp.Data len=%d cap=%d", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(req.Size), req.Size, len(resp.Data), cap(resp.Data))
buff := resp.Data[:cap(resp.Data)]
if req.Size > cap(resp.Data) {
// should not happen
buff = make([]byte, req.Size)
}
totalRead, err := fh.readFromChunks(buff, req.Offset)
if err == nil {
maxStop := fh.readFromDirtyPages(buff, req.Offset)
totalRead = max(maxStop - req.Offset, totalRead)
}
if err != nil {
glog.Errorf("file handle read %s: %v", fh.f.fullpath(), err)
return fuse.EIO
}
totalRead = min(int64(len(buff)), totalRead)
resp.Data = buff[:totalRead]
return err
}
func (fh *FileHandle) readFromDirtyPages(buff []byte, startOffset int64) (maxStop int64) {
return fh.dirtyPages.ReadDirtyData(buff, startOffset)
}
func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) {
fileSize := int64(filer2.FileSize(fh.f.entry))
if fileSize == 0 {
glog.V(1).Infof("empty fh %v", fh.f.fullpath())
return 0, io.EOF
}
var chunkResolveErr error
if fh.f.entryViewCache == nil {
fh.f.entryViewCache, chunkResolveErr = filer2.NonOverlappingVisibleIntervals(filer2.LookupFn(fh.f.wfs), fh.f.entry.Chunks)
if chunkResolveErr != nil {
return 0, fmt.Errorf("fail to resolve chunk manifest: %v", chunkResolveErr)
}
fh.f.reader = nil
}
if fh.f.reader == nil {
chunkViews := filer2.ViewFromVisibleIntervals(fh.f.entryViewCache, 0, math.MaxInt32)
fh.f.reader = filer2.NewChunkReaderAtFromClient(fh.f.wfs, chunkViews, fh.f.wfs.chunkCache, fileSize)
}
totalRead, err := fh.f.reader.ReadAt(buff, offset)
if err == io.EOF {
err = nil
}
if err != nil {
glog.Errorf("file handle read %s: %v", fh.f.fullpath(), err)
}
// glog.V(0).Infof("file handle read %s [%d,%d] %d : %v", fh.f.fullpath(), offset, offset+int64(totalRead), totalRead, err)
return int64(totalRead), err
}
// Write to the file handle
func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
// write the request to volume servers
data := make([]byte, len(req.Data))
copy(data, req.Data)
fh.f.entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(data)), int64(fh.f.entry.Attributes.FileSize)))
glog.V(5).Infof("%v write [%d,%d)", fh.f.fullpath(), req.Offset, req.Offset+int64(len(req.Data)))
chunks, err := fh.dirtyPages.AddPage(req.Offset, data)
if err != nil {
glog.Errorf("%v write fh %d: [%d,%d): %v", fh.f.fullpath(), fh.handle, req.Offset, req.Offset+int64(len(data)), err)
return fuse.EIO
}
resp.Size = len(data)
if req.Offset == 0 {
// detect mime type
fh.contentType = http.DetectContentType(data)
fh.f.dirtyMetadata = true
}
if len(chunks) > 0 {
fh.f.addChunks(chunks)
fh.f.dirtyMetadata = true
}
return nil
}
func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) error {
glog.V(4).Infof("Release %v fh %d", fh.f.fullpath(), fh.handle)
fh.f.isOpen--
if fh.f.isOpen <= 0 {
fh.dirtyPages.releaseResource()
fh.f.wfs.ReleaseHandle(fh.f.fullpath(), fuse.HandleID(fh.handle))
}
fh.f.entryViewCache = nil
fh.f.reader = nil
return nil
}
func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) error {
// fflush works at fh level
// send the data to the OS
glog.V(5).Infof("Flush %s fh %d %v", fh.f.fullpath(), fh.handle, req)
chunks, err := fh.dirtyPages.FlushToStorage()
if err != nil {
glog.Errorf("flush %s: %v", fh.f.fullpath(), err)
return fuse.EIO
}
if len(chunks) > 0 {
fh.f.addChunks(chunks)
fh.f.dirtyMetadata = true
}
if !fh.f.dirtyMetadata {
return nil
}
err = fh.f.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
if fh.f.entry.Attributes != nil {
fh.f.entry.Attributes.Mime = fh.contentType
if fh.f.entry.Attributes.Uid == 0 {
fh.f.entry.Attributes.Uid = req.Uid
}
if fh.f.entry.Attributes.Gid == 0 {
fh.f.entry.Attributes.Gid = req.Gid
}
if fh.f.entry.Attributes.Crtime == 0 {
fh.f.entry.Attributes.Crtime = time.Now().Unix()
}
fh.f.entry.Attributes.Mtime = time.Now().Unix()
fh.f.entry.Attributes.FileMode = uint32(os.FileMode(fh.f.entry.Attributes.FileMode) &^ fh.f.wfs.option.Umask)
fh.f.entry.Attributes.Collection = fh.dirtyPages.collection
fh.f.entry.Attributes.Replication = fh.dirtyPages.replication
}
request := &filer_pb.CreateEntryRequest{
Directory: fh.f.dir.FullPath(),
Entry: fh.f.entry,
}
glog.V(4).Infof("%s set chunks: %v", fh.f.fullpath(), len(fh.f.entry.Chunks))
for i, chunk := range fh.f.entry.Chunks {
glog.V(4).Infof("%s chunks %d: %v [%d,%d)", fh.f.fullpath(), i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size))
}
chunks, garbages := filer2.CompactFileChunks(filer2.LookupFn(fh.f.wfs), fh.f.entry.Chunks)
chunks, manifestErr := filer2.MaybeManifestize(fh.f.wfs.saveDataAsChunk(fh.f.dir.FullPath()), chunks)
if manifestErr != nil {
// not good, but should be ok
glog.V(0).Infof("MaybeManifestize: %v", manifestErr)
}
fh.f.entry.Chunks = chunks
// fh.f.entryViewCache = nil
// special handling of one chunk md5
if len(chunks) == 1 {
}
if err := filer_pb.CreateEntry(client, request); err != nil {
glog.Errorf("fh flush create %s: %v", fh.f.fullpath(), err)
return fmt.Errorf("fh flush create %s: %v", fh.f.fullpath(), err)
}
fh.f.wfs.metaCache.InsertEntry(context.Background(), filer2.FromPbEntry(request.Directory, request.Entry))
fh.f.wfs.deleteFileChunks(garbages)
for i, chunk := range garbages {
glog.V(4).Infof("garbage %s chunks %d: %v [%d,%d)", fh.f.fullpath(), i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size))
}
return nil
})
if err == nil {
fh.f.dirtyMetadata = false
}
if err != nil {
glog.Errorf("%v fh %d flush: %v", fh.f.fullpath(), fh.handle, err)
return fuse.EIO
}
return nil
}
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