Re: [PATCH v2 2/9] ext4: refactor out ext4_generic_attr_store()

Jan Kara
2024-03-14T10:18:07Z

On Tue 27-02-24 17:11:41, 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! Feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

Honza

> ---
> fs/ext4/sysfs.c | 40 +++++++++++++++++++++++++---------------
> 1 file changed, 25 insertions(+), 15 deletions(-)
>
> diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
> index ca820620b974..2b1c529b7fdf 100644
> --- a/fs/ext4/sysfs.c
> +++ b/fs/ext4/sysfs.c
> @@ -443,24 +443,20 @@ 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);
> + int ret;
> unsigned int t;
> unsigned long lt;
> - int ret;
> + void *ptr = calc_ptr(a, sbi);
> +
> + if (!ptr)
> + return 0;
>
> switch (a->attr_id) {
> - case attr_reserved_clusters:
> - return reserved_clusters_store(sbi, buf, len);
> case attr_pointer_ui:
> - if (!ptr)
> - return 0;
> ret = kstrtouint(skip_spaces(buf), 0, &t);
> if (ret)
> return ret;
> @@ -470,19 +466,33 @@ 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, &lt);
> if (ret)
> return ret;
> *((unsigned long *) ptr) = lt;
> 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