[Yaffs] FSX issues on YAFFS2

Hi list,

I come across the same problem in
http://www.aleph1.co.uk/lurker/message/20071008.015825.d64e796b.pt.html

But If I don't use mmap write, fsx will succeed all the time. This is different
from the email thread above.

I also add

if (ivalid & ATTR_SIZE && inode->i_size > attr->ia_size)
    vmtruncate(inode, attr->ia_size);

in yaffs_setattr(), result is the same.
IMHO inode_setattr() in yaffs_setattr() will call vmtruncate()

Any advice for resolve this bug?

Thanks,
Jisheng