File missing or corrupted on mounting jffs2

I'm facing two problems on mounting jffs2 on NOR flash:

I'm running a board with squashfs as rootfs and I tried to mount jffs2 on another mtdblock as below :
mount -t jffs2 /dev/mtdblock6 /tmp/jffs

After that I copy some files into /tmp/jffs but system gives the error when the files larger than 4096 bytes:
cp: write error: Input/output error

Then I unmount the mtdblock and re-mount it again, but the files I just copied has disappeared.

I confirmed the flash block has been written by dumping /dev/mtd6 or /dev/mtdblock6, but those files cannot be seen after remounting.

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I opened the printk log and have following message showed up when I put a file in mounted folder:
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00120814: 0x0219 instead Node totlen on flash (0x0000000c) != totlen from node ref (0x00000044)

and below message appeared when I tried to re-mount the mtdblock:
JFFS2 notice: (608) jffs2_get_inode_nodes: Node header CRC failed at 0x0e0050. {0000,9600,01e88b11,01000000}

Very appreciate if there is any suggestion.