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Subject[PATCH 1/3] sysfs: introduce a sysfs_create_file_uevent new API
Date
Send a uevent notification whenever a new sysfs file is created to allow
userspace processes such as udev to modify permissions on the new files.

This new API function helps to do this.

Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
---
fs/sysfs/file.c | 28 ++++++++++++++++++++++++++++
include/linux/sysfs.h | 13 +++++++++++++
2 files changed, 41 insertions(+)
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 00012e3..5a22d13 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -576,6 +576,34 @@ int sysfs_create_file(struct kobject * kobj, const struct attribute * attr)

}

+/**
+ * sysfs_create_file_uevent - create an attribute file for an object
+ and send a uevent to userspace.
+ * @kobj: object we're creating for.
+ * @attr: attribute descriptor.
+ * @desc: description about the uevent.
+ * @action: kobject uevent action type.
+ */
+
+int sysfs_create_file_uevent(struct kobject *kobj, const struct attribute *attr,
+ const char *desc, enum kobject_action action)
+{
+ int err = 0;
+ char *envp[2];
+
+ BUG_ON(!kobj || !kobj->sd || !attr || !desc);
+
+ err = sysfs_add_file(kobj->sd, attr, SYSFS_KOBJ_ATTR);
+
+ if (desc) {
+ envp[0] = desc;
+ envp[1] = NULL;
+ kobject_uevent_env(kobj, action, envp);
+ }
+
+ return err;
+}
+
int sysfs_create_files(struct kobject *kobj, const struct attribute **ptr)
{
int err = 0;
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 381f06d..0054d41 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -22,6 +22,7 @@
struct kobject;
struct module;
enum kobj_ns_type;
+enum kobject_action;

struct attribute {
const char *name;
@@ -142,6 +143,10 @@ int __must_check sysfs_move_dir(struct kobject *kobj,

int __must_check sysfs_create_file(struct kobject *kobj,
const struct attribute *attr);
+int __must_check sysfs_create_file_uevent(struct kobject * kobj,
+ const struct attribute * attr,
+ const char * desc,
+ enum kobject_action action);
int __must_check sysfs_create_files(struct kobject *kobj,
const struct attribute **attr);
int __must_check sysfs_chmod_file(struct kobject *kobj,
@@ -226,6 +231,14 @@ static inline int sysfs_create_file(struct kobject *kobj,
return 0;
}

+static inline int sysfs_create_file_uevent(struct kobject * kobj,
+ const struct attribute * attr,
+ const char *desc,
+ enum kobject_action action)
+{
+ return 0;
+}
+
static inline int sysfs_create_files(struct kobject *kobj,
const struct attribute **attr)
{
--
1.7.11.1


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