blkparse unplug question

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I am trying to debug a stall I am seeing with CFQ and in the
blktrace/blkparse output I see unplugging lines like the following:

8,3    1     7809  1532.225997730   168  U   N [sync_supers] 31

My question is what does the value after the process name represent? I
see this value increasing from 1, I believe, and then eventually the
value appears to get reset.

I was also wondering if it is possible to translate the block
information provided in blktrace to the corresponding inode?

Thanks for your help!
Josh
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