linux-kernel - Re: [BUG] nfs: readv/writev with O

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Date:	Mon, 29 Oct 2007 15:59:37 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	gurudas pai <gurudas.pai@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] nfs: readv/writev with O_DIRECT fails on  2.6.24-rc1


On Mon, 2007-10-29 at 13:00 +0530, gurudas pai wrote:
> Hi,
> 
> While running olt kit on 2.6.24-rc1 over nfs , Oracle reported I/O 
> errors. I debugged little more and found that readv/writev are failing 
> with O_DIRECT on nfs ( netapp's filer).
> 
> I am able to re-produce same error using ltp/diotest5.
> 
> ./diotest5  -f /storage/nas/testfile -v 5
> 
> diotest05 1953719669  FAIL  :  readv failed: Invalid argument
> diotest05 1953719670  FAIL  :  Read with Direct IO, Write without
> diotest05 1953719671  FAIL  :  writev failed: Invalid argument
> diotest05 1953719672  FAIL  :  Write with Direct IO, Read without
> diotest05 1953719673  FAIL  :  writev failed: Invalid argument
> diotest05 1953719674  FAIL  :  Read, Write with Direct IO
> diotest05    0  INFO  :  3/3 testblocks failed
> 
>  >strace -e readv,writev ./diotest5  -f /storage/nas/testfile -v 5
> writev(3, [{"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}], 5) = 20480
> readv(4, 0x8051000, 5)                  = -1 EINVAL (Invalid argument)
> diotest05 1953719669  FAIL  :  readv failed: Invalid argument
> diotest05 1953719670  FAIL  :  Read with Direct IO, Write without
> writev(3, [{"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}], 5) = -1 EINVAL(Invalid argument)
> diotest05 1953719671  FAIL  :  writev failed: Invalid argument
> diotest05 1953719672  FAIL  :  Write with Direct IO, Read without
> writev(3, [{"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}, {"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 
> 4096}], 5) = -1 EINVAL(Invalid argument)
> diotest05 1953719673  FAIL  :  writev failed: Invalid argument
> diotest05 1953719674  FAIL  :  Read, Write with Direct IO
> diotest05    0  INFO  :  3/3 testblocks failed
> Process 4749 detached
> 
> 
> mount options:
> rw,bg,nointr,hard,timeo=600,wsize=32768,rsize=32768,nfsvers=3,tcp,actimeo=0
> 
> 
> Please let me know if I have to try test/debug patch.

Nobody has yet added support for nvec>1.

Trond

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