[PATCH 1/5] mkfs.f2fs: set encryption feature

[Jaegeuk Kim <jaegeuk@kernel.org>]

This patch add to support encryption feature.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 include/f2fs_fs.h       |  7 +++++++
 mkfs/f2fs_format.c      |  2 ++
 mkfs/f2fs_format_main.c | 16 +++++++++++++++-
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index d23ae1b..6aefa5d 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -251,6 +251,7 @@ struct f2fs_configuration {
 	int fix_on;
 	int bug_on;
 	int auto_fix;
+	__le32 feature;			/* defined features */
 } __attribute__((packed));
 
 #ifdef CONFIG_64BIT
@@ -315,6 +316,8 @@ enum {
 #define MAX_ACTIVE_NODE_LOGS	8
 #define MAX_ACTIVE_DATA_LOGS	8
 
+#define F2FS_FEATURE_ENCRYPT	0x0001
+
 /*
  * For superblock
  */
@@ -353,6 +356,10 @@ struct f2fs_super_block {
 	__le32 cp_payload;
 	__u8 version[VERSION_LEN];	/* the kernel version */
 	__u8 init_version[VERSION_LEN];	/* the initial kernel version */
+	__le32 feature;			/* defined features */
+	__u8 encryption_level;		/* versioning level for encryption */
+	__u8 encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
+	__u8 reserved[871];		/* valid reserved region */
 } __attribute__((packed));
 
 /*
diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
index 094afa3..f879bca 100644
--- a/mkfs/f2fs_format.c
+++ b/mkfs/f2fs_format.c
@@ -364,6 +364,8 @@ static int f2fs_prepare_super_block(void)
 	memcpy(sb.version, config.version, VERSION_LEN);
 	memcpy(sb.init_version, config.version, VERSION_LEN);
 
+	sb.feature = config.feature;
+
 	return 0;
 }
 
diff --git a/mkfs/f2fs_format_main.c b/mkfs/f2fs_format_main.c
index 9a96798..5a9e7e2 100644
--- a/mkfs/f2fs_format_main.c
+++ b/mkfs/f2fs_format_main.c
@@ -33,6 +33,7 @@ static void mkfs_usage()
 	MSG(0, "  -e [extension list] e.g. \"mp3,gif,mov\"\n");
 	MSG(0, "  -l label\n");
 	MSG(0, "  -o overprovision ratio [default:5]\n");
+	MSG(0, "  -O set feature\n");
 	MSG(0, "  -q quiet mode\n");
 	MSG(0, "  -s # of segments per section [default:1]\n");
 	MSG(0, "  -z # of sections per zone [default:1]\n");
@@ -61,9 +62,19 @@ static void f2fs_show_info()
 	MSG(0, "Info: Trim is %s\n", config.trim ? "enabled": "disabled");
 }
 
+static void parse_feature(char *features)
+{
+	if (!strcmp(features, "encrypt")) {
+		config.feature |= cpu_to_le32(F2FS_FEATURE_ENCRYPT);
+	} else {
+		MSG(0, "Error: Wrong features\n");
+		mkfs_usage();
+	}
+}
+
 static void f2fs_parse_options(int argc, char *argv[])
 {
-	static const char *option_string = "qa:d:e:l:o:s:z:t:";
+	static const char *option_string = "qa:d:e:l:o:O:s:z:t:";
 	int32_t option=0;
 
 	while ((option = getopt(argc,argv,option_string)) != EOF) {
@@ -91,6 +102,9 @@ static void f2fs_parse_options(int argc, char *argv[])
 		case 'o':
 			config.overprovision = atoi(optarg);
 			break;
+		case 'O':
+			parse_feature(strdup(optarg));
+			break;
 		case 's':
 			config.segs_per_sec = atoi(optarg);
 			break;
-- 
2.1.1


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