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scsi: sysfs: Introduce sysfs_{un,}break_active_protection()
Introduce these two functions and export them such that the next patch can add calls to these functions from the SCSI core. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: <stable@vger.kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -405,6 +405,50 @@ int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr,
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}
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EXPORT_SYMBOL_GPL(sysfs_chmod_file);
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/**
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* sysfs_break_active_protection - break "active" protection
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* @kobj: The kernel object @attr is associated with.
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* @attr: The attribute to break the "active" protection for.
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*
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* With sysfs, just like kernfs, deletion of an attribute is postponed until
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* all active .show() and .store() callbacks have finished unless this function
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* is called. Hence this function is useful in methods that implement self
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* deletion.
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*/
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struct kernfs_node *sysfs_break_active_protection(struct kobject *kobj,
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const struct attribute *attr)
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{
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struct kernfs_node *kn;
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kobject_get(kobj);
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kn = kernfs_find_and_get(kobj->sd, attr->name);
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if (kn)
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kernfs_break_active_protection(kn);
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return kn;
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}
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EXPORT_SYMBOL_GPL(sysfs_break_active_protection);
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/**
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* sysfs_unbreak_active_protection - restore "active" protection
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* @kn: Pointer returned by sysfs_break_active_protection().
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*
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* Undo the effects of sysfs_break_active_protection(). Since this function
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* calls kernfs_put() on the kernfs node that corresponds to the 'attr'
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* argument passed to sysfs_break_active_protection() that attribute may have
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* been removed between the sysfs_break_active_protection() and
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* sysfs_unbreak_active_protection() calls, it is not safe to access @kn after
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* this function has returned.
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*/
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void sysfs_unbreak_active_protection(struct kernfs_node *kn)
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{
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struct kobject *kobj = kn->parent->priv;
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kernfs_unbreak_active_protection(kn);
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kernfs_put(kn);
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kobject_put(kobj);
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}
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EXPORT_SYMBOL_GPL(sysfs_unbreak_active_protection);
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/**
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* sysfs_remove_file_ns - remove an object attribute with a custom ns tag
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* @kobj: object we're acting for
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@ -237,6 +237,9 @@ int __must_check sysfs_create_files(struct kobject *kobj,
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const struct attribute **attr);
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int __must_check sysfs_chmod_file(struct kobject *kobj,
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const struct attribute *attr, umode_t mode);
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struct kernfs_node *sysfs_break_active_protection(struct kobject *kobj,
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const struct attribute *attr);
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void sysfs_unbreak_active_protection(struct kernfs_node *kn);
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void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
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const void *ns);
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bool sysfs_remove_file_self(struct kobject *kobj, const struct attribute *attr);
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@ -350,6 +353,17 @@ static inline int sysfs_chmod_file(struct kobject *kobj,
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return 0;
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}
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static inline struct kernfs_node *
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sysfs_break_active_protection(struct kobject *kobj,
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const struct attribute *attr)
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{
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return NULL;
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}
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static inline void sysfs_unbreak_active_protection(struct kernfs_node *kn)
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{
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}
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static inline void sysfs_remove_file_ns(struct kobject *kobj,
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const struct attribute *attr,
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const void *ns)
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