MTD NAND driver supports for multi-page read and write

hi
I found that JFFS2 invokes MTD callback directly. Does every read/write to JFFS2 will make be scheduled by block device layer? Because I find that most of read to my NAND flash is composed by one page, write to my NAND flash is composed by one or two page when i use iozone to test the JFFS2 performance. In fact, the NAND flash i have con support multi-pages(at most 32 pages) read/write which has better efficiency. How i have improve the JFFS2 performance by read/write as many pages i during one access to the FS? Thanks.