smbfs_open(): Implement O_APPEND via smbfs_lseek()

[Roland Illig]

Andrew V. Samoilov wrote:
> Hello,
> 
> any complains/side effects?

In the POSIX standard O_APPEND guarantees atomical (seek && write). Your 
patch would not guarantee this. From a theoretical point of view we 
should rather rewrite copy_file_file() to be able to handle these files 
(unless it is already able to do so) than to weaken the guarantee of 
O_APPEND.

Roland