[CRIU] [PATCH] page-xfer: receive information about presence of a parent from a page server (v2)

[Pavel Emelyanov]

On 11/07/2014 10:40 PM, Andrey Vagin wrote:
> We need to know this to insert holes. Currently xfer->parent isn't
> initialized for remote sessions. In most cases it has a non-zero value,
> so generate_iovs() is called with has_parent = true.
> 
> bash test/zdtm.sh -p -P -i 3 ns/transition/fork
> (00.000106) Error (sysctl.c:194): Can't open sysctl net/ipv4/tcp_wmem: No such file or directory
> (00.017048)    420: Error (image.c:231): Unable to open pagemap-420.img: No such file or directory
> (00.017065)    420: Error (image.c:231): Unable to open pages-420.img: No such file or directory
> (00.017090)    420: Error (page-read.c:73): No parent for snapshot pagemap
> (00.017290)     86: Error (cr-restore.c:1185): 420 exited, status=1
> (00.017317) Error (cr-restore.c:1831): Restoring FAILED.
> 
> v2: add a new command to open a page server. It's required to save
> backward compatibility. If someone tries to use an old version of
> page server, he will get an error.
> 
> Reported-by: Mr Jenkins
> Signed-off-by: Andrey Vagin <avagin at openvz.org>

applied