fix: 恢复了FATFS设置卷标的功能

Liteos_a FATFS需要提供格式化时设置卷标的功能，该功能在当前系统中缺失。
为了适配VFS层重构的逻辑，重新封装部分函数。

Close #I3Y5G8
Signed-off-by: NFar <yesiyuan2@huawei.com>

source/ff.c

@@ -5095,13 +5095,10 @@ FRESULT f_getlabel (
 /* Set Volume Label                                                      */
 /*-----------------------------------------------------------------------*/
 
-FRESULT f_setlabel (
-	const TCHAR* label	/* Volume label to set with heading logical drive number */
-)
+FRESULT set_volumn_label(FATFS *fs, const TCHAR *label)
 {
 	FRESULT res;
 	DIR dj;
-	FATFS *fs;
 	BYTE dirvn[22];
 	UINT di;
 	WCHAR wc;
@@ -5109,13 +5106,7 @@ FRESULT f_setlabel (
 #if FF_USE_LFN
 	DWORD dc;
 #endif
-
-	/* Get logical drive */
-	res = find_volume(&label, &fs, FA_WRITE);
-	if (res != FR_OK) LEAVE_FF(fs, res);
-
-
-	/* On the FAT/FAT32 volume */
+		/* On the FAT/FAT32 volume */
 	mem_set(dirvn, ' ', 11);
 	di = 0;
 	while ((UINT)*label >= ' ') {	/* Create volume label */
@@ -5171,6 +5162,22 @@ FRESULT f_setlabel (
 		}
 	}
 
+	return res;
+}
+
+FRESULT f_setlabel (
+	const TCHAR* label	/* Volume label to set with heading logical drive number */
+)
+{
+	FRESULT res;
+	FATFS *fs;
+
+	/* Get logical drive */
+	res = find_volume(&label, &fs, FA_WRITE);
+	if (res != FR_OK) LEAVE_FF(fs, res);
+
+	res = set_volumn_label(fs, label);
+
 	LEAVE_FF(fs, res);
 }
 

source/ff.h

@@ -484,6 +484,7 @@ FRESULT remove_chain (FFOBJID* obj, DWORD clst, DWORD pclst);
 void mem_set (void* dst, int val, UINT cnt);
 void mem_cpy (void* dst, const void* src, UINT cnt);
 int fatfs_get_vol (FATFS *fat);
+FRESULT set_volumn_label(FATFS *fs, const TCHAR *label);
 
 #define f_eof(fp) ((int)((fp)->fptr == (fp)->obj.objsize))
 #define f_error(fp) ((fp)->err)