[PATCH] Another dm and bio problem with 2.6.0

[Mark Haverkamp]

This fixes a problem similar to the patch I submitted on 11/20

http://marc.theaimsgroup.com/?l=linux-kernel&m=106936439707962&w=2

In this case, though, the result is an:

"Incorrect number of segments after building list" message.

The macro __BVEC_START assumes a bi_idx of zero when the dm code can
submit a bio with a non-zero bi_idx.  
The code has been tested on an 8 way / 8gb OSDL STP machine with a 197G
lvm volume running dbt2 test.

===== include/linux/bio.h 1.34 vs edited =====
--- 1.34/include/linux/bio.h	Sun Sep 21 14:50:33 2003
+++ edited/include/linux/bio.h	Wed Dec 17 07:17:53 2003
@@ -162,7 +162,7 @@
  */
 
 #define __BVEC_END(bio)		bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
-#define __BVEC_START(bio)	bio_iovec_idx((bio), 0)
+#define __BVEC_START(bio)	bio_iovec_idx((bio), (bio)->bi_idx)
 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2)	\
 	((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
 #define BIOVEC_VIRT_MERGEABLE(vec1, vec2)	\
 
-- 
Mark Haverkamp <markh@xxxxxxxx>

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