[PATCH] btrfs: add a check for sysfs_create_group

[PATCH] btrfs: add a check for sysfs_create_group

[Kangjie Lu]

In case sysfs_create_group fails, let's check its return value and
issues an error message.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
 fs/btrfs/sysfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 3717c864ba23..62529153a51a 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -889,6 +889,8 @@ void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
 	 */
 	sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
 	ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
+	if (ret)
+		pr_err("failed to create btrfs_feature_attr_group.\n");
 }
 
 static int btrfs_init_debugfs(void)
-- 
2.17.2 (Apple Git-113)

Re: [PATCH] btrfs: add a check for sysfs_create_group

[Qu Wenruo]

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On 2018/12/26 上午11:46, Kangjie Lu wrote:
> In case sysfs_create_group fails, let's check its return value and
> issues an error message.
> 
> Signed-off-by: Kangjie Lu <kjlu@umn.edu>
> ---
>  fs/btrfs/sysfs.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
> index 3717c864ba23..62529153a51a 100644
> --- a/fs/btrfs/sysfs.c
> +++ b/fs/btrfs/sysfs.c
> @@ -889,6 +889,8 @@ void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
>  	 */
>  	sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
>  	ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
> +	if (ret)
> +		pr_err("failed to create btrfs_feature_attr_group.\n");

Btrfs have better error message infrastructures (e.g. distinguish
different filesystems).

Please use btrfs_error() or btrfs_warn() instead.

Despite that, I think the patch looks good.

Thanks,
Qu

>  }
>  
>  static int btrfs_init_debugfs(void)
> 


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