f2fs: assign default compression level

Let's avoid any confusion from assigning compress_level=0 for LZ4HC and ZSTD.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/compress.c

@@ -317,8 +317,6 @@ static const struct f2fs_compress_ops f2fs_lz4_ops = {
 #endif
 
 #ifdef CONFIG_F2FS_FS_ZSTD
-#define F2FS_ZSTD_DEFAULT_CLEVEL	1
-
 static int zstd_init_compress_ctx(struct compress_ctx *cc)
 {
 	zstd_parameters params;
@@ -327,6 +325,7 @@ static int zstd_init_compress_ctx(struct compress_ctx *cc)
 	unsigned int workspace_size;
 	unsigned char level = F2FS_I(cc->inode)->i_compress_level;
 
+	/* Need to remain this for backward compatibility */
 	if (!level)
 		level = F2FS_ZSTD_DEFAULT_CLEVEL;
 

fs/f2fs/f2fs.h

@@ -1440,6 +1440,8 @@ struct compress_data {
 
 #define F2FS_COMPRESSED_PAGE_MAGIC	0xF5F2C000
 
+#define F2FS_ZSTD_DEFAULT_CLEVEL	1
+
 #define	COMPRESS_LEVEL_OFFSET	8
 
 /* compress context */

fs/f2fs/super.c

@@ -589,14 +589,12 @@ static int f2fs_set_lz4hc_level(struct f2fs_sb_info *sbi, const char *str)
 {
 #ifdef CONFIG_F2FS_FS_LZ4HC
 	unsigned int level;
-#endif
 
 	if (strlen(str) == 3) {
-		F2FS_OPTION(sbi).compress_level = 0;
+		F2FS_OPTION(sbi).compress_level = LZ4HC_DEFAULT_CLEVEL;
 		return 0;
 	}
 
-#ifdef CONFIG_F2FS_FS_LZ4HC
 	str += 3;
 
 	if (str[0] != ':') {
@@ -614,6 +612,10 @@ static int f2fs_set_lz4hc_level(struct f2fs_sb_info *sbi, const char *str)
 	F2FS_OPTION(sbi).compress_level = level;
 	return 0;
 #else
+	if (strlen(str) == 3) {
+		F2FS_OPTION(sbi).compress_level = 0;
+		return 0;
+	}
 	f2fs_info(sbi, "kernel doesn't support lz4hc compression");
 	return -EINVAL;
 #endif
@@ -627,7 +629,7 @@ static int f2fs_set_zstd_level(struct f2fs_sb_info *sbi, const char *str)
 	int len = 4;
 
 	if (strlen(str) == len) {
-		F2FS_OPTION(sbi).compress_level = 0;
+		F2FS_OPTION(sbi).compress_level = F2FS_ZSTD_DEFAULT_CLEVEL;
 		return 0;
 	}
 
@@ -640,7 +642,7 @@ static int f2fs_set_zstd_level(struct f2fs_sb_info *sbi, const char *str)
 	if (kstrtouint(str + 1, 10, &level))
 		return -EINVAL;
 
-	if (!level || level > zstd_max_clevel()) {
+	if (level < zstd_min_clevel() || level > zstd_max_clevel()) {
 		f2fs_info(sbi, "invalid zstd compress level: %d", level);
 		return -EINVAL;
 	}