support read

weed/mount/weedfs_file_read.go

@@ -1,7 +1,9 @@
 package mount
 
 import (
+	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/hanwen/go-fuse/v2/fuse"
+	"io"
 )
 
 /**
@@ -29,6 +31,29 @@ import (
  * @param off offset to read from
  * @param fi file information
  */
-func (wfs *WFS) Read(cancel <-chan struct{}, in *fuse.ReadIn, buf []byte) (fuse.ReadResult, fuse.Status) {
-	return nil, fuse.ENOSYS
+func (wfs *WFS) Read(cancel <-chan struct{}, in *fuse.ReadIn, buff []byte) (fuse.ReadResult, fuse.Status) {
+	fh := wfs.GetHandle(FileHandleId(in.Fh))
+	if fh == nil {
+		return nil, fuse.ENOENT
+	}
+
+	offset := int64(in.Offset)
+	fh.lockForRead(offset, len(buff))
+	defer fh.unlockForRead(offset, len(buff))
+
+	totalRead, err := fh.readFromChunks(buff, offset)
+	if err == nil || err == io.EOF {
+		maxStop := fh.readFromDirtyPages(buff, offset)
+		totalRead = max(maxStop-offset, totalRead)
+	}
+	if err == io.EOF {
+		err = nil
+	}
+
+	if err != nil {
+		glog.Warningf("file handle read %s %d: %v", fh.FullPath(), totalRead, err)
+		return nil, fuse.EIO
+	}
+
+	return fuse.ReadResultData(buff[:totalRead]), fuse.OK
 }