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authorBart Van Assche <bart.vanassche@wdc.com>2018-08-02 10:51:40 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2018-08-02 15:53:15 -0400
commit2afc9166f79b8f6da5f347f48515215ceee4ae37 (patch)
tree5d82e76262e17c762b7f75d156121087da8ee0e2
parent7fa8512330ab7cbb394b3e42ee092f4ad2e8f906 (diff)
downloadlinux-2afc9166f79b8f6da5f347f48515215ceee4ae37.tar.bz2
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>
-rw-r--r--fs/sysfs/file.c44
-rw-r--r--include/linux/sysfs.h14
2 files changed, 58 insertions, 0 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 5c13f29bfcdb..118fa197a35f 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -406,6 +406,50 @@ int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr,
EXPORT_SYMBOL_GPL(sysfs_chmod_file);
/**
+ * sysfs_break_active_protection - break "active" protection
+ * @kobj: The kernel object @attr is associated with.
+ * @attr: The attribute to break the "active" protection for.
+ *
+ * With sysfs, just like kernfs, deletion of an attribute is postponed until
+ * all active .show() and .store() callbacks have finished unless this function
+ * is called. Hence this function is useful in methods that implement self
+ * deletion.
+ */
+struct kernfs_node *sysfs_break_active_protection(struct kobject *kobj,
+ const struct attribute *attr)
+{
+ struct kernfs_node *kn;
+
+ kobject_get(kobj);
+ kn = kernfs_find_and_get(kobj->sd, attr->name);
+ if (kn)
+ kernfs_break_active_protection(kn);
+ return kn;
+}
+EXPORT_SYMBOL_GPL(sysfs_break_active_protection);
+
+/**
+ * sysfs_unbreak_active_protection - restore "active" protection
+ * @kn: Pointer returned by sysfs_break_active_protection().
+ *
+ * Undo the effects of sysfs_break_active_protection(). Since this function
+ * calls kernfs_put() on the kernfs node that corresponds to the 'attr'
+ * argument passed to sysfs_break_active_protection() that attribute may have
+ * been removed between the sysfs_break_active_protection() and
+ * sysfs_unbreak_active_protection() calls, it is not safe to access @kn after
+ * this function has returned.
+ */
+void sysfs_unbreak_active_protection(struct kernfs_node *kn)
+{
+ struct kobject *kobj = kn->parent->priv;
+
+ kernfs_unbreak_active_protection(kn);
+ kernfs_put(kn);
+ kobject_put(kobj);
+}
+EXPORT_SYMBOL_GPL(sysfs_unbreak_active_protection);
+
+/**
* sysfs_remove_file_ns - remove an object attribute with a custom ns tag
* @kobj: object we're acting for
* @attr: attribute descriptor
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index b8bfdc173ec0..3c12198c0103 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -237,6 +237,9 @@ int __must_check sysfs_create_files(struct kobject *kobj,
const struct attribute **attr);
int __must_check sysfs_chmod_file(struct kobject *kobj,
const struct attribute *attr, umode_t mode);
+struct kernfs_node *sysfs_break_active_protection(struct kobject *kobj,
+ const struct attribute *attr);
+void sysfs_unbreak_active_protection(struct kernfs_node *kn);
void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
const void *ns);
bool sysfs_remove_file_self(struct kobject *kobj, const struct attribute *attr);
@@ -350,6 +353,17 @@ static inline int sysfs_chmod_file(struct kobject *kobj,
return 0;
}
+static inline struct kernfs_node *
+sysfs_break_active_protection(struct kobject *kobj,
+ const struct attribute *attr)
+{
+ return NULL;
+}
+
+static inline void sysfs_unbreak_active_protection(struct kernfs_node *kn)
+{
+}
+
static inline void sysfs_remove_file_ns(struct kobject *kobj,
const struct attribute *attr,
const void *ns)