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SubjectRe: [PATCH v6 2/6] sysfs: wrap __compat_only_sysfs_link_entry_to_kobj function to change the symlink name
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Sourabh Jain <sourabhjain@linux.ibm.com> writes:
> The __compat_only_sysfs_link_entry_to_kobj function creates a symlink to a
> kobject but doesn't provide an option to change the symlink file name.
>
> This patch adds a wrapper function compat_only_sysfs_link_entry_to_kobj
> that extends the __compat_only_sysfs_link_entry_to_kobj functionality
> which allows function caller to customize the symlink name.
>
> Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
> ---
> fs/sysfs/group.c | 28 +++++++++++++++++++++++++---
> include/linux/sysfs.h | 12 ++++++++++++
> 2 files changed, 37 insertions(+), 3 deletions(-)

I'll assume no one has any objections to this and merge it via the
powerpc tree with the rest of the series.

cheers

> diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
> index d41c21fef138..0993645f0b59 100644
> --- a/fs/sysfs/group.c
> +++ b/fs/sysfs/group.c
> @@ -424,6 +424,25 @@ EXPORT_SYMBOL_GPL(sysfs_remove_link_from_group);
> int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
> struct kobject *target_kobj,
> const char *target_name)
> +{
> + return compat_only_sysfs_link_entry_to_kobj(kobj, target_kobj,
> + target_name, NULL);
> +}
> +EXPORT_SYMBOL_GPL(__compat_only_sysfs_link_entry_to_kobj);
> +
> +/**
> + * compat_only_sysfs_link_entry_to_kobj - add a symlink to a kobject pointing
> + * to a group or an attribute
> + * @kobj: The kobject containing the group.
> + * @target_kobj: The target kobject.
> + * @target_name: The name of the target group or attribute.
> + * @symlink_name: The name of the symlink file (target_name will be
> + * considered if symlink_name is NULL).
> + */
> +int compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
> + struct kobject *target_kobj,
> + const char *target_name,
> + const char *symlink_name)
> {
> struct kernfs_node *target;
> struct kernfs_node *entry;
> @@ -448,12 +467,15 @@ int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
> return -ENOENT;
> }
>
> - link = kernfs_create_link(kobj->sd, target_name, entry);
> + if (!symlink_name)
> + symlink_name = target_name;
> +
> + link = kernfs_create_link(kobj->sd, symlink_name, entry);
> if (IS_ERR(link) && PTR_ERR(link) == -EEXIST)
> - sysfs_warn_dup(kobj->sd, target_name);
> + sysfs_warn_dup(kobj->sd, symlink_name);
>
> kernfs_put(entry);
> kernfs_put(target);
> return PTR_ERR_OR_ZERO(link);
> }
> -EXPORT_SYMBOL_GPL(__compat_only_sysfs_link_entry_to_kobj);
> +EXPORT_SYMBOL_GPL(compat_only_sysfs_link_entry_to_kobj);
> diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
> index 5420817ed317..15b195a4529d 100644
> --- a/include/linux/sysfs.h
> +++ b/include/linux/sysfs.h
> @@ -300,6 +300,10 @@ void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
> int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
> struct kobject *target_kobj,
> const char *target_name);
> +int compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
> + struct kobject *target_kobj,
> + const char *target_name,
> + const char *symlink_name);
>
> void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
>
> @@ -508,6 +512,14 @@ static inline int __compat_only_sysfs_link_entry_to_kobj(
> return 0;
> }
>
> +static int compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
> + struct kobject *target_kobj,
> + const char *target_name,
> + const char *symlink_name)
> +{
> + return 0;
> +}
> +
> static inline void sysfs_notify(struct kobject *kobj, const char *dir,
> const char *attr)
> {
> --
> 2.17.2

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