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https://github.com/rclone/rclone
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85 lines
2.7 KiB
Go
85 lines
2.7 KiB
Go
// +build linux darwin freebsd
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package mount
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import (
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"io"
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"bazil.org/fuse"
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fusefs "bazil.org/fuse/fs"
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"github.com/ncw/rclone/fs/log"
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"github.com/ncw/rclone/vfs"
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"golang.org/x/net/context" // switch to "context" when we stop supporting go1.8
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)
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// FileHandle is an open for read file handle on a File
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type FileHandle struct {
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vfs.Handle
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}
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// Check interface satisfied
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var _ fusefs.HandleReader = (*FileHandle)(nil)
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// Read from the file handle
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func (fh *FileHandle) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) (err error) {
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var n int
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defer log.Trace(fh, "len=%d, offset=%d", req.Size, req.Offset)("read=%d, err=%v", &n, &err)
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data := make([]byte, req.Size)
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n, err = fh.Handle.ReadAt(data, req.Offset)
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if err == io.EOF {
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err = nil
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} else if err != nil {
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return translateError(err)
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}
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resp.Data = data[:n]
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return nil
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}
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// Check interface satisfied
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var _ fusefs.HandleWriter = (*FileHandle)(nil)
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// Write data to the file handle
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func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) (err error) {
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defer log.Trace(fh, "len=%d, offset=%d", len(req.Data), req.Offset)("written=%d, err=%v", &resp.Size, &err)
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n, err := fh.Handle.WriteAt(req.Data, req.Offset)
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if err != nil {
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return translateError(err)
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}
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resp.Size = int(n)
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return nil
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}
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// Check interface satisfied
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var _ fusefs.HandleFlusher = (*FileHandle)(nil)
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// Flush is called on each close() of a file descriptor. So if a
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// filesystem wants to return write errors in close() and the file has
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// cached dirty data, this is a good place to write back data and
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// return any errors. Since many applications ignore close() errors
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// this is not always useful.
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//
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// NOTE: The flush() method may be called more than once for each
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// open(). This happens if more than one file descriptor refers to an
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// opened file due to dup(), dup2() or fork() calls. It is not
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// possible to determine if a flush is final, so each flush should be
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// treated equally. Multiple write-flush sequences are relatively
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// rare, so this shouldn't be a problem.
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//
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// Filesystems shouldn't assume that flush will always be called after
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// some writes, or that if will be called at all.
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func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) (err error) {
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defer log.Trace(fh, "")("err=%v", &err)
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return translateError(fh.Handle.Flush())
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}
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var _ fusefs.HandleReleaser = (*FileHandle)(nil)
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// Release is called when we are finished with the file handle
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//
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// It isn't called directly from userspace so the error is ignored by
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// the kernel
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func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) (err error) {
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defer log.Trace(fh, "")("err=%v", &err)
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return translateError(fh.Handle.Release())
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}
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