1 files changed, 67 insertions, 0 deletions
diff --git a/backport-include/linux/seq_file.h b/backport-include/linux/seq_file.h
new file mode 100644
index 0000000..5b88f6f
--- /dev/null
+++ b/backport-include/linux/seq_file.h
@@ -0,0 +1,67 @@
+#ifndef __BACKPORT_SEQ_FILE_H
+#define __BACKPORT_SEQ_FILE_H
+#include_next <linux/seq_file.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_IS_LESS(3,7,0)
+#include <linux/user_namespace.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#ifdef CONFIG_USER_NS
+static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
+{
+	struct file *f = container_of((void *) seq, struct file, private_data);
+
+	return f->f_cred->user_ns;
+}
+#else
+static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
+{
+	extern struct user_namespace init_user_ns;
+	return &init_user_ns;
+}
+#endif /* CONFIG_USER_NS */
+#endif /* < 3.7 */
+
+#if LINUX_VERSION_IS_LESS(3,19,0)
+#define seq_has_overflowed LINUX_BACKPORT(seq_has_overflowed)
+/**
+ * seq_has_overflowed - check if the buffer has overflowed
+ * @m: the seq_file handle
+ *
+ * seq_files have a buffer which may overflow. When this happens a larger
+ * buffer is reallocated and all the data will be printed again.
+ * The overflow state is true when m->count == m->size.
+ *
+ * Returns true if the buffer received more than it can hold.
+ */
+static inline bool seq_has_overflowed(struct seq_file *m)
+{
+	return m->count == m->size;
+}
+#endif
+
+#if LINUX_VERSION_IS_LESS(4,3,0)
+#define seq_hex_dump LINUX_BACKPORT(seq_hex_dump)
+void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
+		  int rowsize, int groupsize, const void *buf, size_t len,
+		  bool ascii);
+#endif
+
+#ifndef DEFINE_SHOW_ATTRIBUTE
+#define DEFINE_SHOW_ATTRIBUTE(__name)					\
+static int __name ## _open(struct inode *inode, struct file *file)	\
+{									\
+	return single_open(file, __name ## _show, inode->i_private);	\
+}									\
+									\
+static const struct file_operations __name ## _fops = {			\
+	.owner		= THIS_MODULE,					\
+	.open		= __name ## _open,				\
+	.read		= seq_read,					\
+	.llseek		= seq_lseek,					\
+	.release	= single_release,				\
+}
+#endif /* DEFINE_SHOW_ATTRIBUTE */
+
+#endif /* __BACKPORT_SEQ_FILE_H */