diff --git a/internal/fusefrontend/node.go b/internal/fusefrontend/node.go index c4a80dd..2f5f3ec 100644 --- a/internal/fusefrontend/node.go +++ b/internal/fusefrontend/node.go @@ -350,3 +350,53 @@ func (n *Node) Mknod(ctx context.Context, name string, mode, rdev uint32, out *f inode = n.newChild(ctx, st, out) return inode, 0 } + +// Link - FUSE call. Creates a hard link at "newPath" pointing to file +// "oldPath". +// +// Symlink-safe through use of Linkat(). +func (n *Node) Link(ctx context.Context, target fs.InodeEmbedder, name string, out *fuse.EntryOut) (inode *fs.Inode, errno syscall.Errno) { + dirfd, cName, errno := n.prepareAtSyscall(name) + if errno != 0 { + return + } + defer syscall.Close(dirfd) + + n2 := target.(*Node) + dirfd2, cName2, errno := n2.prepareAtSyscall("") + if errno != 0 { + return + } + defer syscall.Close(dirfd2) + + // Handle long file name (except in PlaintextNames mode) + rn := n.rootNode() + var err error + if !rn.args.PlaintextNames && nametransform.IsLongContent(cName) { + err = rn.nameTransform.WriteLongNameAt(dirfd, cName, name) + if err != nil { + errno = fs.ToErrno(err) + return + } + // Create "gocryptfs.longfile." link + err = syscallcompat.Linkat(dirfd2, cName2, dirfd, cName, 0) + if err != nil { + nametransform.DeleteLongNameAt(dirfd, cName) + } + } else { + // Create regular link + err = syscallcompat.Linkat(dirfd2, cName2, dirfd, cName, 0) + } + if err != nil { + errno = fs.ToErrno(err) + return + } + + st, err := syscallcompat.Fstatat2(dirfd, cName, unix.AT_SYMLINK_NOFOLLOW) + if err != nil { + errno = fs.ToErrno(err) + return + } + inode = n.newChild(ctx, st, out) + return inode, 0 +} diff --git a/internal/fusefrontend/node_api_check.go b/internal/fusefrontend/node_api_check.go index d99564f..a59971f 100644 --- a/internal/fusefrontend/node_api_check.go +++ b/internal/fusefrontend/node_api_check.go @@ -18,6 +18,7 @@ var _ = (fs.NodeOpendirer)((*Node)(nil)) var _ = (fs.NodeSetattrer)((*Node)(nil)) var _ = (fs.NodeStatfser)((*Node)(nil)) var _ = (fs.NodeMknoder)((*Node)(nil)) +var _ = (fs.NodeLinker)((*Node)(nil)) /* TODO var _ = (fs.NodeGetxattrer)((*Node)(nil)) @@ -25,7 +26,6 @@ var _ = (fs.NodeSetxattrer)((*Node)(nil)) var _ = (fs.NodeRemovexattrer)((*Node)(nil)) var _ = (fs.NodeListxattrer)((*Node)(nil)) var _ = (fs.NodeCopyFileRanger)((*Node)(nil)) -var _ = (fs.NodeLinker)((*Node)(nil)) var _ = (fs.NodeSymlinker)((*Node)(nil)) var _ = (fs.NodeRenamer)((*Node)(nil)) */