ext4: translate a few more map flags to strings in tracepoints

As new ext4_map_blocks() flags have been added, not all have gotten flag
bit to string translations to make tracepoint output more readable.
Fix that, and go one step further by adding a translation for the
EXT4_EX_NOCACHE flag as well.  The EXT4_EX_FORCE_CACHE flag can never
be set in a tracepoint in the current code, so there's no need to
bother with a translation for it right now.
Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20200415203140.30349-3-enwlinux@gmail.comSigned-off-by: Theodore Ts'o <tytso@mit.edu>

include/trace/events/ext4.h

@@ -45,7 +45,10 @@ struct partial_cluster;
 	{ EXT4_GET_BLOCKS_CONVERT,		"CONVERT" },		\
 	{ EXT4_GET_BLOCKS_METADATA_NOFAIL,	"METADATA_NOFAIL" },	\
 	{ EXT4_GET_BLOCKS_NO_NORMALIZE,		"NO_NORMALIZE" },	\
-	{ EXT4_GET_BLOCKS_ZERO,			"ZERO" })
+	{ EXT4_GET_BLOCKS_CONVERT_UNWRITTEN,	"CONVERT_UNWRITTEN" },  \
+	{ EXT4_GET_BLOCKS_ZERO,			"ZERO" },		\
+	{ EXT4_GET_BLOCKS_IO_SUBMIT,		"IO_SUBMIT" },		\
+	{ EXT4_EX_NOCACHE,			"EX_NOCACHE" })
 
 /*
  * __print_flags() requires that all enum values be wrapped in the