crit: translate pagemap flags into strings

This translates pagemap flags into strings for easier readability.
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

images/pagemap.proto

@@ -10,5 +10,5 @@ message pagemap_entry {
 	required uint64 vaddr		= 1 [(criu).hex = true];
 	required uint32 nr_pages	= 2;
 	optional bool	in_parent	= 3;
-	optional uint32	flags		= 4 [(criu).hex = true];
+	optional uint32	flags		= 4 [(criu).flags = "pmap.flags" ];
 }

lib/py/images/pb2dict.py

@@ -105,11 +105,19 @@ rfile_flags_map = [
 	('O_LARGEFILE',	0100000),
 ];
 
+pmap_flags_map = [
+	('PE_PARENT',	1 << 0),
+	('PE_ZERO',	1 << 1),
+	('PE_LAZY',	1 << 2),
+	('PE_PRESENT',	1 << 3),
+];
+
 flags_maps = {
 	'mmap.prot' : mmap_prot_map,
 	'mmap.flags' : mmap_flags_map,
 	'mmap.status' : mmap_status_map,
 	'rfile.flags' : rfile_flags_map,
+	'pmap.flags' : pmap_flags_map,
 }
 
 gen_maps = {