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sysfs: add sysfs_link_change_owner()
Add a helper to change the owner of a sysfs link. This function will be used to correctly account for kobject ownership changes, e.g. when moving network devices between network namespaces. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -570,6 +570,47 @@ static int internal_change_owner(struct kernfs_node *kn, kuid_t kuid,
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return kernfs_setattr(kn, &newattrs);
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return kernfs_setattr(kn, &newattrs);
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}
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}
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/**
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* sysfs_link_change_owner - change owner of a sysfs file.
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* @kobj: object of the kernfs_node the symlink is located in.
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* @targ: object of the kernfs_node the symlink points to.
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* @name: name of the link.
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* @kuid: new owner's kuid
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* @kgid: new owner's kgid
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*
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* This function looks up the sysfs symlink entry @name under @kobj and changes
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* the ownership to @kuid/@kgid. The symlink is looked up in the namespace of
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* @targ.
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*
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* Returns 0 on success or error code on failure.
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*/
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int sysfs_link_change_owner(struct kobject *kobj, struct kobject *targ,
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const char *name, kuid_t kuid, kgid_t kgid)
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{
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struct kernfs_node *kn = NULL;
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int error;
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if (!name || !kobj->state_in_sysfs || !targ->state_in_sysfs)
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return -EINVAL;
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error = -ENOENT;
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kn = kernfs_find_and_get_ns(kobj->sd, name, targ->sd->ns);
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if (!kn)
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goto out;
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error = -EINVAL;
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if (kernfs_type(kn) != KERNFS_LINK)
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goto out;
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if (kn->symlink.target_kn->priv != targ)
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goto out;
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error = internal_change_owner(kn, kuid, kgid);
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out:
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kernfs_put(kn);
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return error;
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}
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/**
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/**
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* sysfs_file_change_owner - change owner of a sysfs file.
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* sysfs_file_change_owner - change owner of a sysfs file.
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* @kobj: object.
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* @kobj: object.
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@ -312,6 +312,8 @@ static inline void sysfs_enable_ns(struct kernfs_node *kn)
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int sysfs_file_change_owner(struct kobject *kobj, const char *name, kuid_t kuid,
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int sysfs_file_change_owner(struct kobject *kobj, const char *name, kuid_t kuid,
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kgid_t kgid);
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kgid_t kgid);
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int sysfs_link_change_owner(struct kobject *kobj, struct kobject *targ,
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const char *name, kuid_t kuid, kgid_t kgid);
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#else /* CONFIG_SYSFS */
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#else /* CONFIG_SYSFS */
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@ -532,6 +534,14 @@ static inline int sysfs_file_change_owner(struct kobject *kobj,
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return 0;
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return 0;
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}
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}
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static inline int sysfs_link_change_owner(struct kobject *kobj,
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struct kobject *targ,
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const char *name, kuid_t kuid,
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kgid_t kgid)
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{
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return 0;
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}
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#endif /* CONFIG_SYSFS */
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#endif /* CONFIG_SYSFS */
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static inline int __must_check sysfs_create_file(struct kobject *kobj,
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static inline int __must_check sysfs_create_file(struct kobject *kobj,
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