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[dm-devel] [PATCH] kcopyd.c : Set bh->b_count to 1 in dispatch_bh()



Set bh->b_count to 1 in dispatch_bh().

I'm not entirely sure this is necessary. RAID-1 sets this value to 1, RAID-5
sets it to zero, and loop doesn't set it at all. I guess it all really depends
on if any of the device drivers are going to access that field. The only
obvious place I see it being accessed is in ide-floppy and ide-tape. This
patch sets it to one. May not be required, but shouldn't hurt anything.
Anyone have any insights?

--- linux-2.4.20a/drivers/md/kcopyd.c	2003/01/09 17:11:50
+++ linux-2.4.20b/drivers/md/kcopyd.c	2003/01/09 17:34:29
@@ -338,6 +338,7 @@
 	init_buffer(bh, end_bh, job);
 
 	bh->b_dev = job->disk.dev;
+	atomic_set(&bh->b_count, 1);
 
 	set_bit(BH_Uptodate, &bh->b_state);
 	set_bit(BH_Mapped, &bh->b_state);



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