.

include/wendelin/bigfile/file.h

@@ -52,12 +52,23 @@ struct bigfile_ops {
     /* loadblk is called to load file block into memory.
      *
      * NOTE loadblk is called from SIGSEGV signal handler context.
+     * XXX loadblk -> !mmap_read ?
      *
      * len(buf) must be = file->blksize.
      * @return  0 - ok      !0 - fail
      */
     int  (*loadblk)  (BigFile *file, blk_t blk, void *buf);
 
+    /* mmap_read is called to mmap read-only file[offset +len) into @addr.
+     *
+     * XXX mmap_read -> !loadblk ?
+     * NOTE offset and len are in bytes, not pages.
+     *
+     * @addr    NULL - mmap at anywhere,    !NULL - mmap exactly at addr.
+     * @return  !NULL - mapped there,       NULL - error.
+     */
+    void*(*mmap_read)(BigFile *file, void *addr, off_t pgoffset, size_t len);
+
     /* storeblk is called to store file block from memory.
      *
      * NOTE contrary to loadblk, storeblk is called from regular context.