[Yaffs] mounting large yaffs device takes a long time?

Hi:

I'm using yaffs on a 6×1GB nandflash array. When the disk is full of files,
it takes as long as 2-3 minutes to mount it. I did a simple profiling and
found out yaffs_Scan and yaffs_Scanback costs most of the time.

Is there any way to improve the scanning speed on large yaffs device?

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rogerz zhang