Refactor out the function ext4_generic_attr_store() to handle the setting
of values of various common types, with no functional changes.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
---
 fs/ext4/sysfs.c | 49 ++++++++++++++++++++++++++++---------------------
 1 file changed, 28 insertions(+), 21 deletions(-)

diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index 3671a8aaf4af..834f9a0eb641 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -443,26 +443,22 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
 	return 0;
 }
 
-static ssize_t ext4_attr_store(struct kobject *kobj,
-			       struct attribute *attr,
-			       const char *buf, size_t len)
+static ssize_t ext4_generic_attr_store(struct ext4_attr *a,
+				       struct ext4_sb_info *sbi,
+				       const char *buf, size_t len)
 {
-	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
-						s_kobj);
-	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
-	void *ptr = calc_ptr(a, sbi);
-	unsigned long t;
 	int ret;
+	unsigned long t;
+	void *ptr = calc_ptr(a, sbi);
+
+	if (!ptr)
+		return 0;
+	ret = kstrtoul(skip_spaces(buf), 0, &t);
+	if (ret)
+		return ret;
 
 	switch (a->attr_id) {
-	case attr_reserved_clusters:
-		return reserved_clusters_store(sbi, buf, len);
 	case attr_pointer_ui:
-		if (!ptr)
-			return 0;
-		ret = kstrtoul(skip_spaces(buf), 0, &t);
-		if (ret)
-			return ret;
 		if (t != (unsigned int)t)
 			return -EINVAL;
 		if (a->attr_ptr == ptr_ext4_super_block_offset)
@@ -471,19 +467,30 @@ static ssize_t ext4_attr_store(struct kobject *kobj,
 			*((unsigned int *) ptr) = t;
 		return len;
 	case attr_pointer_ul:
-		if (!ptr)
-			return 0;
-		ret = kstrtoul(skip_spaces(buf), 0, &t);
-		if (ret)
-			return ret;
 		*((unsigned long *) ptr) = t;
 		return len;
+	}
+	return 0;
+}
+
+static ssize_t ext4_attr_store(struct kobject *kobj,
+			       struct attribute *attr,
+			       const char *buf, size_t len)
+{
+	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
+						s_kobj);
+	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
+
+	switch (a->attr_id) {
+	case attr_reserved_clusters:
+		return reserved_clusters_store(sbi, buf, len);
 	case attr_inode_readahead:
 		return inode_readahead_blks_store(sbi, buf, len);
 	case attr_trigger_test_error:
 		return trigger_test_error(sbi, buf, len);
+	default:
+		return ext4_generic_attr_store(a, sbi, buf, len);
 	}
-	return 0;
 }
 
 static void ext4_sb_release(struct kobject *kobj)
-- 
2.31.1

On Fri 26-01-24 16:57:11, Baokun Li wrote:
> Refactor out the function ext4_generic_attr_store() to handle the setting
> of values of various common types, with no functional changes.
> 
> Signed-off-by: Baokun Li <libaokun1@huawei.com>
...
> -static ssize_t ext4_attr_store(struct kobject *kobj,
> -			       struct attribute *attr,
> -			       const char *buf, size_t len)
> +static ssize_t ext4_generic_attr_store(struct ext4_attr *a,
> +				       struct ext4_sb_info *sbi,
> +				       const char *buf, size_t len)
>  {
> -	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
> -						s_kobj);
> -	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
> -	void *ptr = calc_ptr(a, sbi);
> -	unsigned long t;
>  	int ret;
> +	unsigned long t;
> +	void *ptr = calc_ptr(a, sbi);
> +
> +	if (!ptr)
> +		return 0;
> +	ret = kstrtoul(skip_spaces(buf), 0, &t);

The refactorization is nice but I'd keep the string to number conversion
inside the switch so that we can distinguish uint and ulong cases.

								Honza

> +	if (ret)
> +		return ret;
>  
>  	switch (a->attr_id) {
> -	case attr_reserved_clusters:
> -		return reserved_clusters_store(sbi, buf, len);
>  	case attr_pointer_ui:
> -		if (!ptr)
> -			return 0;
> -		ret = kstrtoul(skip_spaces(buf), 0, &t);
> -		if (ret)
> -			return ret;
>  		if (t != (unsigned int)t)
>  			return -EINVAL;
>  		if (a->attr_ptr == ptr_ext4_super_block_offset)
> @@ -471,19 +467,30 @@ static ssize_t ext4_attr_store(struct kobject *kobj,
>  			*((unsigned int *) ptr) = t;
>  		return len;
>  	case attr_pointer_ul:
> -		if (!ptr)
> -			return 0;
> -		ret = kstrtoul(skip_spaces(buf), 0, &t);
> -		if (ret)
> -			return ret;
>  		*((unsigned long *) ptr) = t;
>  		return len;
> +	}
> +	return 0;
> +}
> +
> +static ssize_t ext4_attr_store(struct kobject *kobj,
> +			       struct attribute *attr,
> +			       const char *buf, size_t len)
> +{
> +	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
> +						s_kobj);
> +	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
> +
> +	switch (a->attr_id) {
> +	case attr_reserved_clusters:
> +		return reserved_clusters_store(sbi, buf, len);
>  	case attr_inode_readahead:
>  		return inode_readahead_blks_store(sbi, buf, len);
>  	case attr_trigger_test_error:
>  		return trigger_test_error(sbi, buf, len);
> +	default:
> +		return ext4_generic_attr_store(a, sbi, buf, len);
>  	}
> -	return 0;
>  }
>  
>  static void ext4_sb_release(struct kobject *kobj)
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

On 2024/1/26 16:57, Baokun Li wrote:
> Refactor out the function ext4_generic_attr_store() to handle the setting
> of values of various common types, with no functional changes.
> 
> Signed-off-by: Baokun Li <libaokun1@huawei.com>

Looks good to me.

Reviewed-by: Zhang Yi <yi.zhang@huawei.com>

> ---
>  fs/ext4/sysfs.c | 49 ++++++++++++++++++++++++++++---------------------
>  1 file changed, 28 insertions(+), 21 deletions(-)
> 
> diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
> index 3671a8aaf4af..834f9a0eb641 100644
> --- a/fs/ext4/sysfs.c
> +++ b/fs/ext4/sysfs.c
> @@ -443,26 +443,22 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
>  	return 0;
>  }
>  
> -static ssize_t ext4_attr_store(struct kobject *kobj,
> -			       struct attribute *attr,
> -			       const char *buf, size_t len)
> +static ssize_t ext4_generic_attr_store(struct ext4_attr *a,
> +				       struct ext4_sb_info *sbi,
> +				       const char *buf, size_t len)
>  {
> -	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
> -						s_kobj);
> -	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
> -	void *ptr = calc_ptr(a, sbi);
> -	unsigned long t;
>  	int ret;
> +	unsigned long t;
> +	void *ptr = calc_ptr(a, sbi);
> +
> +	if (!ptr)
> +		return 0;
> +	ret = kstrtoul(skip_spaces(buf), 0, &t);
> +	if (ret)
> +		return ret;
>  
>  	switch (a->attr_id) {
> -	case attr_reserved_clusters:
> -		return reserved_clusters_store(sbi, buf, len);
>  	case attr_pointer_ui:
> -		if (!ptr)
> -			return 0;
> -		ret = kstrtoul(skip_spaces(buf), 0, &t);
> -		if (ret)
> -			return ret;
>  		if (t != (unsigned int)t)
>  			return -EINVAL;
>  		if (a->attr_ptr == ptr_ext4_super_block_offset)
> @@ -471,19 +467,30 @@ static ssize_t ext4_attr_store(struct kobject *kobj,
>  			*((unsigned int *) ptr) = t;
>  		return len;
>  	case attr_pointer_ul:
> -		if (!ptr)
> -			return 0;
> -		ret = kstrtoul(skip_spaces(buf), 0, &t);
> -		if (ret)
> -			return ret;
>  		*((unsigned long *) ptr) = t;
>  		return len;
> +	}
> +	return 0;
> +}
> +
> +static ssize_t ext4_attr_store(struct kobject *kobj,
> +			       struct attribute *attr,
> +			       const char *buf, size_t len)
> +{
> +	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
> +						s_kobj);
> +	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
> +
> +	switch (a->attr_id) {
> +	case attr_reserved_clusters:
> +		return reserved_clusters_store(sbi, buf, len);
>  	case attr_inode_readahead:
>  		return inode_readahead_blks_store(sbi, buf, len);
>  	case attr_trigger_test_error:
>  		return trigger_test_error(sbi, buf, len);
> +	default:
> +		return ext4_generic_attr_store(a, sbi, buf, len);
>  	}
> -	return 0;
>  }
>  
>  static void ext4_sb_release(struct kobject *kobj)
>