[CRIU] [PATCH] image: Add O_OPT when trying to open optional image files

[Pavel Emelyanov]

On 03/14/2014 05:38 PM, Cyrill Gorcunov wrote:
> During the time some files become obsolete and might be missing
> in checkpoint image set, but to keep backward compatibility we
> still trying to open them, which might print out error like
> 
>  | Unable to open 'path-to-file'
> 
> and confuse a reader why criu prints error but continue working.
> 
> To eliminate this problem O_OPT flag has been introduced in
> commit 16b5692061e2, which suppress error message priting
> if the flag is set.
> 
> Now start using O_OPT in the following functions
> 
>  - open_irmap_cache: irmap cache is relatively new optional feature
> 
>  - prepare_rlimits, open_signal_image, restore_file_locks,
>    prepare_fd_pid, prepare_mm_pid, collect_image: all these
>    helpers are trying to open image files which can be missing.
> 
> Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>

applied