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-rw-r--r--fs/sysfs/group.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index 23c1e598792a..442f34ff1af8 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -148,6 +148,65 @@ void sysfs_remove_group(struct kobject * kobj,
sysfs_put(sd);
}
+/**
+ * sysfs_merge_group - merge files into a pre-existing attribute group.
+ * @kobj: The kobject containing the group.
+ * @grp: The files to create and the attribute group they belong to.
+ *
+ * This function returns an error if the group doesn't exist or any of the
+ * files already exist in that group, in which case none of the new files
+ * are created.
+ */
+int sysfs_merge_group(struct kobject *kobj,
+ const struct attribute_group *grp)
+{
+ struct sysfs_dirent *dir_sd;
+ int error = 0;
+ struct attribute *const *attr;
+ int i;
+
+ if (grp)
+ dir_sd = sysfs_get_dirent(kobj->sd, NULL, grp->name);
+ else
+ dir_sd = sysfs_get(kobj->sd);
+ if (!dir_sd)
+ return -ENOENT;
+
+ for ((i = 0, attr = grp->attrs); *attr && !error; (++i, ++attr))
+ error = sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
+ if (error) {
+ while (--i >= 0)
+ sysfs_hash_and_remove(dir_sd, NULL, (*--attr)->name);
+ }
+ sysfs_put(dir_sd);
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(sysfs_merge_group);
+
+/**
+ * sysfs_unmerge_group - remove files from a pre-existing attribute group.
+ * @kobj: The kobject containing the group.
+ * @grp: The files to remove and the attribute group they belong to.
+ */
+void sysfs_unmerge_group(struct kobject *kobj,
+ const struct attribute_group *grp)
+{
+ struct sysfs_dirent *dir_sd;
+ struct attribute *const *attr;
+
+ if (grp)
+ dir_sd = sysfs_get_dirent(kobj->sd, NULL, grp->name);
+ else
+ dir_sd = sysfs_get(kobj->sd);
+ if (dir_sd) {
+ for (attr = grp->attrs; *attr; ++attr)
+ sysfs_hash_and_remove(dir_sd, NULL, (*attr)->name);
+ sysfs_put(dir_sd);
+ }
+}
+EXPORT_SYMBOL_GPL(sysfs_unmerge_group);
+
EXPORT_SYMBOL_GPL(sysfs_create_group);
EXPORT_SYMBOL_GPL(sysfs_update_group);