mirror of
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291 lines
8.0 KiB
Go
291 lines
8.0 KiB
Go
//go:build linux
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package mount
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import (
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"context"
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"fmt"
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"io"
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"os"
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"path"
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"syscall"
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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/rclone/rclone/cmd/mountlib"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/log"
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"github.com/rclone/rclone/vfs"
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)
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// Dir represents a directory entry
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type Dir struct {
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*vfs.Dir
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fsys *FS
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}
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// Check interface satisfied
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var _ fusefs.Node = (*Dir)(nil)
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// Attr updates the attributes of a directory
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func (d *Dir) Attr(ctx context.Context, a *fuse.Attr) (err error) {
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defer log.Trace(d, "")("attr=%+v, err=%v", a, &err)
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a.Valid = time.Duration(d.fsys.opt.AttrTimeout)
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a.Gid = d.VFS().Opt.GID
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a.Uid = d.VFS().Opt.UID
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a.Mode = d.Mode()
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modTime := d.ModTime()
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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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// FIXME include Valid so get some caching?
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// FIXME fs.Debugf(d.path, "Dir.Attr %+v", a)
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return nil
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}
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// Check interface satisfied
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var _ fusefs.NodeSetattrer = (*Dir)(nil)
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// Setattr handles attribute changes from FUSE. Currently supports ModTime only.
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func (d *Dir) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *fuse.SetattrResponse) (err error) {
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defer log.Trace(d, "stat=%+v", req)("err=%v", &err)
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if d.VFS().Opt.NoModTime {
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return nil
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}
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if req.Valid.MtimeNow() {
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err = d.SetModTime(time.Now())
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} else if req.Valid.Mtime() {
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err = d.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.NodeRequestLookuper = (*Dir)(nil)
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// Lookup looks up a specific entry in the receiver.
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//
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// Lookup should return a Node corresponding to the entry. If the
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// name does not exist in the directory, Lookup should return ENOENT.
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//
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// Lookup need not to handle the names "." and "..".
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func (d *Dir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.LookupResponse) (node fusefs.Node, err error) {
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defer log.Trace(d, "name=%q", req.Name)("node=%+v, err=%v", &node, &err)
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mnode, err := d.Dir.Stat(req.Name)
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if err != nil {
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return nil, translateError(err)
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}
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resp.EntryValid = time.Duration(d.fsys.opt.AttrTimeout)
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// Check the mnode to see if it has a fuse Node cached
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// We must return the same fuse nodes for vfs Nodes
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node, ok := mnode.Sys().(fusefs.Node)
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if ok {
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return node, nil
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}
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switch x := mnode.(type) {
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case *vfs.File:
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node = &File{x, d.fsys}
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case *vfs.Dir:
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node = &Dir{x, d.fsys}
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default:
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panic("bad type")
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}
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// Cache the node for later
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mnode.SetSys(node)
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return node, nil
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}
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// Check interface satisfied
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var _ fusefs.HandleReadDirAller = (*Dir)(nil)
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// ReadDirAll reads the contents of the directory
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func (d *Dir) ReadDirAll(ctx context.Context) (dirents []fuse.Dirent, err error) {
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itemsRead := -1
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defer log.Trace(d, "")("item=%d, err=%v", &itemsRead, &err)
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items, err := d.Dir.ReadDirAll()
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if err != nil {
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return nil, translateError(err)
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}
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dirents = append(dirents, fuse.Dirent{
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Type: fuse.DT_Dir,
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Name: ".",
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}, fuse.Dirent{
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Type: fuse.DT_Dir,
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Name: "..",
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})
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for _, node := range items {
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name := node.Name()
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if len(name) > mountlib.MaxLeafSize {
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fs.Errorf(d, "Name too long (%d bytes) for FUSE, skipping: %s", len(name), name)
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continue
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}
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var dirent = fuse.Dirent{
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// Inode FIXME ???
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Type: fuse.DT_File,
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Name: name,
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}
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if node.IsDir() {
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dirent.Type = fuse.DT_Dir
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}
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dirents = append(dirents, dirent)
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}
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itemsRead = len(dirents)
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return dirents, nil
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}
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var _ fusefs.NodeCreater = (*Dir)(nil)
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// Create makes a new file
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func (d *Dir) Create(ctx context.Context, req *fuse.CreateRequest, resp *fuse.CreateResponse) (node fusefs.Node, handle fusefs.Handle, err error) {
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defer log.Trace(d, "name=%q", req.Name)("node=%v, handle=%v, err=%v", &node, &handle, &err)
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// translate the fuse flags to os flags
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osFlags := int(req.Flags) | os.O_CREATE
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file, err := d.Dir.Create(req.Name, osFlags)
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if err != nil {
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return nil, nil, translateError(err)
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}
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fh, err := file.Open(osFlags)
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if err != nil {
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return nil, nil, translateError(err)
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}
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node = &File{file, d.fsys}
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file.SetSys(node) // cache the FUSE node for later
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return node, &FileHandle{fh}, err
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}
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var _ fusefs.NodeMkdirer = (*Dir)(nil)
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// Mkdir creates a new directory
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func (d *Dir) Mkdir(ctx context.Context, req *fuse.MkdirRequest) (node fusefs.Node, err error) {
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defer log.Trace(d, "name=%q", req.Name)("node=%+v, err=%v", &node, &err)
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dir, err := d.Dir.Mkdir(req.Name)
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if err != nil {
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return nil, translateError(err)
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}
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node = &Dir{dir, d.fsys}
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dir.SetSys(node) // cache the FUSE node for later
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return node, nil
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}
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var _ fusefs.NodeRemover = (*Dir)(nil)
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// Remove removes the entry with the given name from
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// the receiver, which must be a directory. The entry to be removed
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// may correspond to a file (unlink) or to a directory (rmdir).
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func (d *Dir) Remove(ctx context.Context, req *fuse.RemoveRequest) (err error) {
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defer log.Trace(d, "name=%q", req.Name)("err=%v", &err)
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err = d.Dir.RemoveName(req.Name)
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if err != nil {
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return translateError(err)
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}
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return nil
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}
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// Invalidate a leaf in a directory
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func (d *Dir) invalidateEntry(dirNode fusefs.Node, leaf string) {
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fs.Debugf(dirNode, "Invalidating %q", leaf)
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err := d.fsys.server.InvalidateEntry(dirNode, leaf)
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if err != nil {
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fs.Debugf(dirNode, "Failed to invalidate %q: %v", leaf, err)
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}
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}
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// Check interface satisfied
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var _ fusefs.NodeRenamer = (*Dir)(nil)
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// Rename the file
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func (d *Dir) Rename(ctx context.Context, req *fuse.RenameRequest, newDir fusefs.Node) (err error) {
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defer log.Trace(d, "oldName=%q, newName=%q, newDir=%+v", req.OldName, req.NewName, newDir)("err=%v", &err)
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destDir, ok := newDir.(*Dir)
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if !ok {
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return fmt.Errorf("unknown Dir type %T", newDir)
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}
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err = d.Dir.Rename(req.OldName, req.NewName, destDir.Dir)
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if err != nil {
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return translateError(err)
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}
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// Invalidate the new directory entry so it gets re-read (in
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// the background otherwise we cause a deadlock)
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//
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// See https://github.com/rclone/rclone/issues/4977 for why
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go d.invalidateEntry(newDir, req.NewName)
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//go d.invalidateEntry(d, req.OldName)
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return nil
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}
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// Check interface satisfied
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var _ fusefs.NodeFsyncer = (*Dir)(nil)
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// Fsync the directory
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func (d *Dir) Fsync(ctx context.Context, req *fuse.FsyncRequest) (err error) {
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defer log.Trace(d, "")("err=%v", &err)
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err = d.Dir.Sync()
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if err != nil {
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return translateError(err)
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}
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return nil
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}
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// Check interface satisfied
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var _ fusefs.NodeLinker = (*Dir)(nil)
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// Link creates a new directory entry in the receiver based on an
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// existing Node. Receiver must be a directory.
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func (d *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fusefs.Node) (newNode fusefs.Node, err error) {
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defer log.Trace(d, "req=%v, old=%v", req, old)("new=%v, err=%v", &newNode, &err)
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return nil, syscall.ENOSYS
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}
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var _ fusefs.NodeSymlinker = (*Dir)(nil)
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// Symlink create a symbolic link.
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func (d *Dir) Symlink(ctx context.Context, req *fuse.SymlinkRequest) (node fusefs.Node, err error) {
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defer log.Trace(d, "newname=%v, target=%v", req.NewName, req.Target)("node=%v, err=%v", &node, &err)
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newName := path.Join(d.Path(), req.NewName)
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target := req.Target
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n, err := d.VFS().CreateSymlink(target, newName)
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if err != nil {
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return nil, err
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}
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node = &File{n.(*vfs.File), d.fsys}
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return node, nil
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}
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// Check interface satisfied
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var _ fusefs.NodeMknoder = (*Dir)(nil)
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// Mknod is called to create a file. Since we define create this will
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// be called in preference, however NFS likes to call it for some
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// reason. We don't actually create a file here just the Node.
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func (d *Dir) Mknod(ctx context.Context, req *fuse.MknodRequest) (node fusefs.Node, err error) {
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defer log.Trace(d, "name=%v, mode=%d, rdev=%d", req.Name, req.Mode, req.Rdev)("node=%v, err=%v", &node, &err)
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if req.Rdev != 0 {
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fs.Errorf(d, "Can't create device node %q", req.Name)
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return nil, fuse.Errno(syscall.EIO)
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}
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var cReq = fuse.CreateRequest{
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Name: req.Name,
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Flags: fuse.OpenFlags(os.O_CREATE | os.O_WRONLY),
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Mode: req.Mode,
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Umask: req.Umask,
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}
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var cResp fuse.CreateResponse
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node, handle, err := d.Create(ctx, &cReq, &cResp)
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if err != nil {
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return nil, err
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}
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err = handle.(io.Closer).Close()
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if err != nil {
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return nil, err
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}
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return node, nil
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}
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