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8.5.7.5: FTFMT_STATUS -- monitor formatting a tape track

This operation is needed to synchronize the user level formatting program with the kernel level device driver while formatting a tape track. It simply returns the number of the segment that just has been formatted. This ioctl is provided such that the user level program knows which parts of the DMA buffers should be touched when the memory mapped DMA buffer region is too small to hold all sector coordinates for an entire tape track. In this case the user level program should simply continue with filling the DMA buffers at the base address of the memory mapped region if the end of that region is hit; but it should take care not to cross the location in the buffer that corresponds to the segment that is returned by FTFMT_STATUS as this (or the following segment) is the segment that is currently being worked on. See FTFMT_FORMAT_TRACK.


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