linux-kernel - Re: [PATCH] NFS: account direct-io into task io accounting

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Date:	Tue, 22 Feb 2011 00:27:32 +0300
From:	Konstantin Khlebnikov <khlebnikov@...allels.com>
To:	Chuck Lever <chuck.lever@...cle.com>
CC:	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] NFS: account direct-io into task io accounting

Chuck Lever wrote:
>
> On Feb 21, 2011, at 11:15 AM, Konstantin Khlebnikov wrote:
>
>> Account complete NFS direct-io reads and writes into Task I/O Accounting.
>>
>> NFS have unusual direct-io implementation,
>> thus accounting in generic code does not work.
>>
>> Signed-off-by: Konstantin Khlebnikov<khlebnikov@...nvz.org>
>> ---
>> fs/nfs/direct.c |    9 +++++++--
>> 1 files changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
>> index 9943a75..bab4185 100644
>> --- a/fs/nfs/direct.c
>> +++ b/fs/nfs/direct.c
>> @@ -45,6 +45,7 @@
>> #include<linux/pagemap.h>
>> #include<linux/kref.h>
>> #include<linux/slab.h>
>> +#include<linux/task_io_accounting_ops.h>
>>
>> #include<linux/nfs_fs.h>
>> #include<linux/nfs_page.h>
>> @@ -939,8 +940,10 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, const struct iovec *iov,
>> 		goto out;
>>
>> 	retval = nfs_direct_read(iocb, iov, nr_segs, pos);
>> -	if (retval>  0)
>> +	if (retval>  0) {
>> 		iocb->ki_pos = pos + retval;
>> +		task_io_account_read(retval);
>> +	}
>>
>> out:
>> 	return retval;
>> @@ -1001,8 +1004,10 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
>>
>> 	retval = nfs_direct_write(iocb, iov, nr_segs, pos, count);
>>
>> -	if (retval>  0)
>> +	if (retval>  0) {
>> 		iocb->ki_pos = pos + retval;
>> +		task_io_account_write(retval);
>> +	}
>
> The async path always returns -EIOCBQUEUED.  How are those bytes accounted for?
>

Oh, thanks. I forget about aio.
So, there only one option -- always account whole requiest before completion.

>>
>> out:
>> 	return retval;
>
> --
> Chuck Lever
> chuck[dot]lever[at]oracle[dot]com
>
>
>

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