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119 lines
3.5 KiB
Go
119 lines
3.5 KiB
Go
// +build linux darwin freebsd
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package mount
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import (
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"time"
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"bazil.org/fuse"
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fusefs "bazil.org/fuse/fs"
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"github.com/ncw/rclone/cmd/mountlib"
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"github.com/ncw/rclone/fs"
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"github.com/pkg/errors"
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"golang.org/x/net/context"
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)
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// File represents a file
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type File struct {
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*mountlib.File
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// size int64 // size of file - read and written with atomic int64 - must be 64 bit aligned
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// d *Dir // parent directory - read only
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// mu sync.RWMutex // protects the following
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// o fs.Object // NB o may be nil if file is being written
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// writers int // number of writers for this file
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// pendingModTime time.Time // will be applied once o becomes available, i.e. after file was written
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}
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// Check interface satisfied
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var _ fusefs.Node = (*File)(nil)
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// Attr fills out the attributes for the file
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func (f *File) Attr(ctx context.Context, a *fuse.Attr) (err error) {
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defer fs.Trace(f, "")("a=%+v, err=%v", a, &err)
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modTime, Size, Blocks, err := f.File.Attr(mountlib.NoModTime)
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if err != nil {
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return translateError(err)
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}
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a.Gid = mountlib.GID
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a.Uid = mountlib.UID
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a.Mode = mountlib.FilePerms
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a.Size = Size
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a.Atime = modTime
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a.Mtime = modTime
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a.Ctime = modTime
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a.Crtime = modTime
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a.Blocks = Blocks
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return nil
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}
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// Check interface satisfied
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var _ fusefs.NodeSetattrer = (*File)(nil)
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// Setattr handles attribute changes from FUSE. Currently supports ModTime only.
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func (f *File) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *fuse.SetattrResponse) (err error) {
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defer fs.Trace(f, "a=%+v", req)("err=%v", &err)
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if mountlib.NoModTime {
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return nil
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}
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if req.Valid.MtimeNow() {
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err = f.File.SetModTime(time.Now())
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} else if req.Valid.Mtime() {
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err = f.File.SetModTime(req.Mtime)
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}
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return translateError(err)
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}
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// Check interface satisfied
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var _ fusefs.NodeOpener = (*File)(nil)
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// Open the file for read or write
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func (f *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fh fusefs.Handle, err error) {
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defer fs.Trace(f, "flags=%v", req.Flags)("fh=%v, err=%v", &fh, &err)
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switch {
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case req.Flags.IsReadOnly():
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if mountlib.NoSeek {
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resp.Flags |= fuse.OpenNonSeekable
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}
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var rfh *mountlib.ReadFileHandle
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rfh, err = f.File.OpenRead()
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fh = &ReadFileHandle{rfh}
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case req.Flags.IsWriteOnly() || (req.Flags.IsReadWrite() && (req.Flags&fuse.OpenTruncate) != 0):
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resp.Flags |= fuse.OpenNonSeekable
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var wfh *mountlib.WriteFileHandle
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wfh, err = f.File.OpenWrite()
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fh = &WriteFileHandle{wfh}
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case req.Flags.IsReadWrite():
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err = errors.New("can't open for read and write simultaneously")
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default:
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err = errors.Errorf("can't figure out how to open with flags %v", req.Flags)
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}
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/*
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// File was opened in append-only mode, all writes will go to end
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// of file. OS X does not provide this information.
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OpenAppend OpenFlags = syscall.O_APPEND
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OpenCreate OpenFlags = syscall.O_CREAT
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OpenDirectory OpenFlags = syscall.O_DIRECTORY
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OpenExclusive OpenFlags = syscall.O_EXCL
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OpenNonblock OpenFlags = syscall.O_NONBLOCK
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OpenSync OpenFlags = syscall.O_SYNC
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OpenTruncate OpenFlags = syscall.O_TRUNC
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*/
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if err != nil {
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return nil, translateError(err)
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}
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return fh, nil
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}
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// Check interface satisfied
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var _ fusefs.NodeFsyncer = (*File)(nil)
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// Fsync the file
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//
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// Note that we don't do anything except return OK
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func (f *File) Fsync(ctx context.Context, req *fuse.FsyncRequest) (err error) {
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defer fs.Trace(f, "")("err=%v", &err)
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return nil
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}
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