update name of code to labcodes

labcodes/lab8/kern/fs/iobuf.h

@@ -0,0 +1,24 @@
+#ifndef __KERN_FS_IOBUF_H__
+#define __KERN_FS_IOBUF_H__
+
+#include <defs.h>
+
+/*
+ * iobuf is a buffer Rd/Wr status record
+ */
+struct iobuf {
+    void *io_base;     // the base addr of buffer (used for Rd/Wr)
+    off_t io_offset;   // current Rd/Wr position in buffer, will have been incremented by the amount transferred
+    size_t io_len;     // the length of buffer  (used for Rd/Wr)
+    size_t io_resid;   // current resident length need to Rd/Wr, will have been decremented by the amount transferred.
+};
+
+#define iobuf_used(iob)                         ((size_t)((iob)->io_len - (iob)->io_resid))
+
+struct iobuf *iobuf_init(struct iobuf *iob, void *base, size_t len, off_t offset);
+int iobuf_move(struct iobuf *iob, void *data, size_t len, bool m2b, size_t *copiedp);
+int iobuf_move_zeros(struct iobuf *iob, size_t len, size_t *copiedp);
+void iobuf_skip(struct iobuf *iob, size_t n);
+
+#endif /* !__KERN_FS_IOBUF_H__ */
+