[f2fs-dev][PATCH] resize.f2fs: add option for large_nat_bitmap feature

[ping xiong <xp1982.06.06@gmail.com>]

From: xiongping1 <xiongping1@xiaomi.com>

resize.f2fs has already supported large_nat_bitmap feature, but has no
option to turn on it.

This change add a new '-i' option to control turning on/off it.

Signed-off-by: xiongping1 <xiongping1@xiaomi.com>
---
 fsck/main.c   | 6 +++++-
 fsck/resize.c | 5 +++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/fsck/main.c b/fsck/main.c
index 9a7d499..e7e3dfc 100644
--- a/fsck/main.c
+++ b/fsck/main.c
@@ -104,6 +104,7 @@ void resize_usage()
 	MSG(0, "\nUsage: resize.f2fs [options] device\n");
 	MSG(0, "[options]:\n");
 	MSG(0, "  -d debug level [default:0]\n");
+	MSG(0, "  -i extended node bitmap, node ratio is 20%% by default\n");
 	MSG(0, "  -s safe resize (Does not resize metadata)");
 	MSG(0, "  -t target sectors [default: device size]\n");
 	MSG(0, "  -V print the version number and exit\n");
@@ -449,7 +450,7 @@ void f2fs_parse_options(int argc, char *argv[])
 				break;
 		}
 	} else if (!strcmp("resize.f2fs", prog)) {
-		const char *option_string = "d:st:V";
+		const char *option_string = "d:st:iV";
 
 		c.func = RESIZE;
 		while ((option = getopt(argc, argv, option_string)) != EOF) {
@@ -476,6 +477,9 @@ void f2fs_parse_options(int argc, char *argv[])
 					ret = sscanf(optarg, "%"PRIx64"",
 							&c.target_sectors);
 				break;
+			case 'i':
+				c.large_nat_bitmap = 1;
+				break;
 			case 'V':
 				show_version(prog);
 				exit(0);
diff --git a/fsck/resize.c b/fsck/resize.c
index fc563f2..88e063e 100644
--- a/fsck/resize.c
+++ b/fsck/resize.c
@@ -519,6 +519,11 @@ static void rebuild_checkpoint(struct f2fs_sb_info *sbi,
 	else
 		set_cp(checksum_offset, CP_CHKSUM_OFFSET);
 
+	if (c.large_nat_bitmap) {
+		set_cp(checksum_offset, CP_MIN_CHKSUM_OFFSET);
+		flags |= CP_LARGE_NAT_BITMAP_FLAG;
+	}
+
 	set_cp(ckpt_flags, flags);
 
 	memcpy(new_cp, cp, (unsigned char *)cp->sit_nat_version_bitmap -
-- 
2.7.4