| Message ID | 1603355997-32350-2-git-send-email-luojiaxing@huawei.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | Introduce a new helper marco DEFINE_STORE_ATTRIBUTE at seq_file.c | expand |
On Thu, Oct 22, 2020 at 04:39:53PM +0800, Luo Jiaxing wrote: > We already own DEFINE_SHOW_ATTRIBUTE() helper macro for defining attribute > for read-only file, but we found many of drivers want a helper marco for > read-write file too. I would expect that DEFINE_STORE maps to WO attribute... For RW SHOW_STORE would be more appropriate. Otherwise I think it makes sense.
Hi On 2020/10/22 22:22, Andy Shevchenko wrote: > On Thu, Oct 22, 2020 at 04:39:53PM +0800, Luo Jiaxing wrote: >> We already own DEFINE_SHOW_ATTRIBUTE() helper macro for defining attribute >> for read-only file, but we found many of drivers want a helper marco for >> read-write file too. > I would expect that DEFINE_STORE maps to WO attribute... > For RW SHOW_STORE would be more appropriate. > > Otherwise I think it makes sense. Thanks for the review, it's true that the name is a bit inappropriate. I'll change the name if I get a v2 patch. But AI doesn't seem to like this macro : ) Thanks Jiaxing >
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h index 813614d..3b3b797 100644 --- a/include/linux/seq_file.h +++ b/include/linux/seq_file.h @@ -191,6 +191,21 @@ static const struct proc_ops __name ## _proc_ops = { \ .proc_release = single_release, \ } +#define DEFINE_STORE_ATTRIBUTE(__name) \ +static int __name ## _open(struct inode *inode, struct file *file) \ +{ \ + return single_open(file, __name ## _show, inode->i_private); \ +} \ + \ +static const struct file_operations __name ## _fops = { \ + .owner = THIS_MODULE, \ + .open = __name ## _open, \ + .read = seq_read, \ + .write = __name ## _write, \ + .llseek = seq_lseek, \ + .release = single_release, \ +} + static inline struct user_namespace *seq_user_ns(struct seq_file *seq) { #ifdef CONFIG_USER_NS
We already own DEFINE_SHOW_ATTRIBUTE() helper macro for defining attribute for read-only file, but we found many of drivers want a helper marco for read-write file too. So we try to make one to decrease code duplication. Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com> --- include/linux/seq_file.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)