Re: [Devil-Linux-discuss] [Devil-Linux 1.4 0000066]: virtio-access produce IO-Errors

[Serge L. <fi...@in...>]

Udo,

you are welcome.
I've perused the patch and the bug description, then compared it with the recent
kernel patch 2.6.32.10. The patch seems to be integrated.

Please take a look:

Patch:
-----------------------------------------------------------------------
#  end_request: I/O error, dev vda, sector 0
#  end_request: I/O error, dev vda, sector 0
#  commit 52b1fd5a27c625c78373e024bf570af3c9d44a79
#  Author: Mikulas Patocka <mpa...@re...>
#    dm: send empty barriers to targets in dm_flush
#  https://bugzilla.redhat.com/514901
# block/blk-core.c |    3 +--
# 1 files changed, 1 insertions(+), 2 deletions(-)
--- a/block/blk-core.c
+++ a/block/blk-core.c
@@ -1163,8 +1163,7 @@ static int __make_request(struct request_queue *q, struct
bio *bio)
        const int unplug = bio_unplug(bio);
        int rw_flags;

-       if (bio_barrier(bio) && bio_has_data(bio) &&
-           (q->next_ordered == QUEUE_ORDERED_NONE)) {
+       if (bio_barrier(bio) && (q->next_ordered == QUEUE_ORDERED_NONE)) {
                bio_endio(bio, -EOPNOTSUPP);
                return 0;
        }


Kernel code:
-----------------------------------------------------------------------
        int rw_flags;

        if (bio_rw_flagged(bio, BIO_RW_BARRIER) &&
            (q->next_ordered == QUEUE_ORDERED_NONE)) {
                bio_endio(bio, -EOPNOTSUPP);
                return 0;
        }
-----------------------------------------------------------------------
I'm not a kernel hacker though and can be wrong...

 Could you please help me with the issue reproducing?

Serge

On 03/18/2010 07:47 AM, SourceForge.net: Mantis Bug Tracker: project :
devil-linux wrote:
> 
> The following issue has been SUBMITTED. 
> ====================================================================== 
> https://sourceforge.net/apps/mantisbt/devil-linux/view.php?id=66 
> ====================================================================== 
> Reported By:                ulembke
> Assigned To:                
> ====================================================================== 
> Project:                    Devil-Linux 1.4
> Issue ID:                   66
> Category:                   Bug
> Reproducibility:            always
> Severity:                   minor
> Priority:                   normal
> Status:                     new
> ====================================================================== 
> Date Submitted:             2010-03-18 14:47 UTC
> Last Modified:              2010-03-18 14:47 UTC
> ====================================================================== 
> Summary:                    virtio-access produce IO-Errors
> Description: 
> Fist i have to thank you for the fast solution about the
> virtio-configstore.
> Unfortunately produce the usage of virtio with lvm an error:
> end_request: I/O error, dev vda, sector 0
> 
> There is a fix for that bug:
> http://lkml.org/lkml/2009/8/6/153
> 
> Perhaps it's possible to patch the kernel?
> 
> Best regards
> 
> Udo
> ====================================================================== 
> 
> Issue History 
> Date Modified    Username       Field                    Change               
> ====================================================================== 
> 2010-03-18 14:47 ulembke        New Issue                                    
> ======================================================================
> 
>