f2fs: use new ioprio Macro to get ckpt thread ioprio level

IOPRIO_PRIO_DATA in the new kernel version includes level and hint,
So Macro IOPRIO_PRIO_LEVEL is more accurate to get ckpt thread
ioprio data/level, and it is also consisten with the way setting
ckpt thread ioprio by IOPRIO_PRIO_VALUE(class, data/level).

Besides, change variable name from "data" to "level" for more readable.
Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/sysfs.c

@@ -340,13 +340,13 @@ static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 	if (!strcmp(a->attr.name, "ckpt_thread_ioprio")) {
 		struct ckpt_req_control *cprc = &sbi->cprc_info;
 		int class = IOPRIO_PRIO_CLASS(cprc->ckpt_thread_ioprio);
-		int data = IOPRIO_PRIO_DATA(cprc->ckpt_thread_ioprio);
+		int level = IOPRIO_PRIO_LEVEL(cprc->ckpt_thread_ioprio);
 
 		if (class != IOPRIO_CLASS_RT && class != IOPRIO_CLASS_BE)
 			return -EINVAL;
 
 		return sysfs_emit(buf, "%s,%d\n",
-			class == IOPRIO_CLASS_RT ? "rt" : "be", data);
+			class == IOPRIO_CLASS_RT ? "rt" : "be", level);
 	}
 
 #ifdef CONFIG_F2FS_FS_COMPRESSION
@@ -450,7 +450,7 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
 		const char *name = strim((char *)buf);
 		struct ckpt_req_control *cprc = &sbi->cprc_info;
 		int class;
-		long data;
+		long level;
 		int ret;
 
 		if (!strncmp(name, "rt,", 3))
@@ -461,13 +461,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
 			return -EINVAL;
 
 		name += 3;
-		ret = kstrtol(name, 10, &data);
+		ret = kstrtol(name, 10, &level);
 		if (ret)
 			return ret;
-		if (data >= IOPRIO_NR_LEVELS || data < 0)
+		if (level >= IOPRIO_NR_LEVELS || level < 0)
 			return -EINVAL;
 
-		cprc->ckpt_thread_ioprio = IOPRIO_PRIO_VALUE(class, data);
+		cprc->ckpt_thread_ioprio = IOPRIO_PRIO_VALUE(class, level);
 		if (test_opt(sbi, MERGE_CHECKPOINT)) {
 			ret = set_task_ioprio(cprc->f2fs_issue_ckpt,
 					cprc->ckpt_thread_ioprio);