vfs_preallocate   305 lib/vfs/vfs.h  int vfs_preallocate (int dest_desc, off_t src_fsize, off_t dest_fsize);
vfs_preallocate  2655 src/filemanager/file.c            vfs_preallocate (dest_desc, file_size, appending ? dst_stat.st_size : 0) != 0)