> +static void *cgroup_seqfile_start(struct seq_file *seq, loff_t *ppos)
> +{
> + struct cftype *cft = seq_cft(seq);
> +
> + if (cft->seq_start) {
> + return cft->seq_start(seq, ppos);
> + } else {
> + /*
> + * The same behavior and code as single_open(). Returns
> + * !NULL if pos is at the beginning; otherwise, NULL.
> + */
Isn't it simpler to choose between seq_open() and single_open() depending
on if cft->seq_start is implemented?
> + return NULL + !*ppos;
> + }
> +}
...
> static int cgroup_file_open(struct inode *inode, struct file *file)
> {
> struct cfent *cfe = __d_cfe(file->f_dentry);
> @@ -2338,20 +2384,17 @@ static int cgroup_file_open(struct inode *inode, struct file *file)
> WARN_ON_ONCE(cfe->css && cfe->css != css);
> cfe->css = css;
>
> - if (cft->open) {
> - err = cft->open(inode, file);
> - } else {
> - err = single_open_size(file, cgroup_seqfile_show, cfe,
> - sizeof(struct cgroup_open_file));
> - if (!err) {
> - struct seq_file *sf = file->private_data;
> - struct cgroup_open_file *of = sf->private;
> + err = seq_open_private(file, &cgroup_seq_operations,
> + sizeof(struct cgroup_open_file));
> + if (!err) {
> + struct seq_file *sf = file->private_data;
> + struct cgroup_open_file *of = sf->private;
>
> - of->cfe = cfe;
> - }
> + of->cfe = cfe;
> + return 0;
> }
>
> - if (css->ss && err)
> + if (css->ss)
> css_put(css);
> return err;
> }
--
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