[PATCH] fs/fscache/object-list.c: use __seq_open_private()

[PATCH] fs/fscache/object-list.c: use __seq_open_private()

[Rob Jones]

Reduce boilerplate code by using __seq_open_private() instead of seq_open()
in fscache_objlist_open().

Signed-off-by: Rob Jones <rob.jones@codethink.co.uk>
---

Note that sparse generates a warning on this file but it is outside the
remit of this patch. 

Note 2, it looks to me like the sparse warning may be a false positive.

 fs/fscache/object-list.c |   16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/fs/fscache/object-list.c b/fs/fscache/object-list.c
index b5ebc2d..a1ca2f9 100644
--- a/fs/fscache/object-list.c
+++ b/fs/fscache/object-list.c
@@ -380,26 +380,14 @@ no_config:
 static int fscache_objlist_open(struct inode *inode, struct file *file)
 {
 	struct fscache_objlist_data *data;
-	struct seq_file *m;
-	int ret;
 
-	ret = seq_open(file, &fscache_objlist_ops);
-	if (ret < 0)
-		return ret;
-
-	m = file->private_data;
-
-	/* buffer for key extraction */
-	data = kmalloc(sizeof(struct fscache_objlist_data), GFP_KERNEL);
-	if (!data) {
-		seq_release(inode, file);
+	data = __seq_open_private(file, &fscache_objlist_ops, sizeof(*data));
+	if (!data)
 		return -ENOMEM;
-	}
 
 	/* get the configuration key */
 	fscache_objlist_config(data);
 
-	m->private = data;
 	return 0;
 }
 
-- 
1.7.10.4

Re: [PATCH] fs/fscache/object-list.c: use __seq_open_private()

[Rob Jones]

I submitted the patch below on 17th September but have had no feedback.

It seems to me a worthwhile change (well, I wouldn't have written it
otherwise) but does anybody else have any comments on it?

On 17/09/14 09:56, Rob Jones wrote:
> Reduce boilerplate code by using __seq_open_private() instead of seq_open()
> in fscache_objlist_open().
>
> Signed-off-by: Rob Jones <rob.jones@codethink.co.uk>
> ---
>
> Note that sparse generates a warning on this file but it is outside the
> remit of this patch.
>
> Note 2, it looks to me like the sparse warning may be a false positive.
>
>   fs/fscache/object-list.c |   16 ++--------------
>   1 file changed, 2 insertions(+), 14 deletions(-)
>
> diff --git a/fs/fscache/object-list.c b/fs/fscache/object-list.c
> index b5ebc2d..a1ca2f9 100644
> --- a/fs/fscache/object-list.c
> +++ b/fs/fscache/object-list.c
> @@ -380,26 +380,14 @@ no_config:
>   static int fscache_objlist_open(struct inode *inode, struct file *file)
>   {
>   	struct fscache_objlist_data *data;
> -	struct seq_file *m;
> -	int ret;
>
> -	ret = seq_open(file, &fscache_objlist_ops);
> -	if (ret < 0)
> -		return ret;
> -
> -	m = file->private_data;
> -
> -	/* buffer for key extraction */
> -	data = kmalloc(sizeof(struct fscache_objlist_data), GFP_KERNEL);
> -	if (!data) {
> -		seq_release(inode, file);
> +	data = __seq_open_private(file, &fscache_objlist_ops, sizeof(*data));
> +	if (!data)
>   		return -ENOMEM;
> -	}
>
>   	/* get the configuration key */
>   	fscache_objlist_config(data);
>
> -	m->private = data;
>   	return 0;
>   }
>
>

-- 
Rob Jones
Codethink Ltd
mailto:rob.jones@codethink.co.uk
tel:+44 161 236 5575

Re: [PATCH] fs/fscache/object-list.c: use __seq_open_private()

[David Howells]

Rob Jones <rob.jones@codethink.co.uk> wrote:

> I submitted the patch below on 17th September but have had no feedback.

It is now upstream.

David