reach of jffs2 within image vs. partition

[John Burch]

Will JFFS2 ever read/write an area of flash memory that is within the
same mtd partition but outside of the jffs2 image (as defined -p switch
of mkfs.jffs2)?  In other words, if the jffs2 image spans 0x0 - 0x120000
and it lies within an mtd partition that spans 0x0 - 0x140000, will the
last 128k, spanning from 0x120000 - 0x140000, ever be accessed in any
way by jffs2?  Would that 128k area be as safe/non-volatile there as in
a separate partition?
 
Thanks,
John