update name of code to labcodes

labcodes/lab8/kern/fs/sfs/bitmap.h

@@ -0,0 +1,32 @@
+#ifndef __KERN_FS_SFS_BITMAP_H__
+#define __KERN_FS_SFS_BITMAP_H__
+
+#include <defs.h>
+
+
+/*
+ * Fixed-size array of bits. (Intended for storage management.)
+ *
+ * Functions:
+ *     bitmap_create  - allocate a new bitmap object.
+ *                      Returns NULL on error.
+ *     bitmap_getdata - return pointer to raw bit data (for I/O).
+ *     bitmap_alloc   - locate a cleared bit, set it, and return its index.
+ *     bitmap_mark    - set a clear bit by its index.
+ *     bitmap_unmark  - clear a set bit by its index.
+ *     bitmap_isset   - return whether a particular bit is set or not.
+ *     bitmap_destroy - destroy bitmap.
+ */
+
+
+struct bitmap;
+
+struct bitmap *bitmap_create(uint32_t nbits);                     // allocate a new bitmap object.
+int bitmap_alloc(struct bitmap *bitmap, uint32_t *index_store);   // locate a cleared bit, set it, and return its index.
+bool bitmap_test(struct bitmap *bitmap, uint32_t index);          // return whether a particular bit is set or not.
+void bitmap_free(struct bitmap *bitmap, uint32_t index);          // according index, set related bit to 1
+void bitmap_destroy(struct bitmap *bitmap);                       // free memory contains bitmap
+void *bitmap_getdata(struct bitmap *bitmap, size_t *len_store);   // return pointer to raw bit data (for I/O)
+
+#endif /* !__KERN_FS_SFS_BITMAP_H__ */
+