Re: report bug: System reboots when accessing a loop-device over a second loop-device with 2.4.2-ac7

[Jens Axboe]

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On Fri, Mar 02 2001, Mario Hermann wrote:
> But with old 2.2 - Material stored on DVD-RAM. 
> 
>   losetup -e blowfish /dev/loop0 /dev/sr3
>   lsoetup -e serpent /dev/loop1 /dev/loop0
> 
> it doesn't work.

(replied to Mario earlier, for reference here's the patch).

Yet another miscount and IV off, I apparently missed the latter
when the other IV calculations were fixed. I've verified block
crypto here now.

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Jens Axboe

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--- /opt/kernel/linux-2.4.2-ac10/drivers/block/loop.c	Sat Mar  3 04:16:23 2001
+++ drivers/block/loop.c	Sat Mar  3 04:18:54 2001
@@ -345,8 +345,6 @@
 		struct buffer_head *rbh = bh->b_private;
 
 		rbh->b_end_io(rbh, uptodate);
-		if (atomic_dec_and_test(&lo->lo_pending))
-			up(&lo->lo_bh_mutex);
 		loop_put_buffer(bh);
 	} else
 		loop_add_bh(lo, bh);
@@ -479,6 +477,7 @@
 
 		IV = (bh->b_rsector / (bh->b_size >> 9));
 		IV += lo->lo_offset / bh->b_size;
+		IV >>= 2;
 
 		ret = lo_do_transfer(lo, READ, bh->b_data, rbh->b_data,
 				     bh->b_size, IV);

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