[dm-devel] [PATCH] clear seg valid when resetting bi_idx

[Mike Christie]

In __end_that_request_first if the bio is partially completed 
blk_recalc_rq_segments will reset the segment values. If the bio is 
later remapped and resent becuase of an error, we restore bi_idx but the 
segment values are left to the partially completed state causing many 
fun problems when blk_rq_map_sg is called in SCSI.

The attached patch clears the BIO_SEG_VALID bit, so the segment values 
are recalculated when it is resent. It was built and tested against 
2.6.4-udm1.

Mike Christie
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