From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 19 Feb 2009 09:21:12 +0000
Subject: Re: [PATCH] Removed empty data files
Message-Id: <20090219092112.GI30821@kernel.dk>
List-Id: <linux-btrace.vger.kernel.org>
References: <499AC3D5.8050008@hp.com>
In-Reply-To: <499AC3D5.8050008@hp.com>
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To: linux-btrace@vger.kernel.org

On Tue, Feb 17 2009, Alan D. Brunelle wrote:
> Does anybody rely upon _all_ of the blktrace.X files being generated
> (even if they are 0-lengthed)?

If blkparse handles it, I think it's good enough...

> 

> From 1da4effb9b61928b6475ac0cba05a1f32468185e Mon Sep 17 00:00:00 2001
> From: Alan D. Brunelle <alan.brunelle@hp.com>
> Date: Tue, 17 Feb 2009 09:01:04 -0500
> Subject: [PATCH] Removed empty data files
> 
> It's not unusual to have lots of empty blktrace files, this unlinks
> files at the end of the run that are empty.
> 
> Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com>
> ---
>  blktrace.c |   16 +++++++++++++---
>  1 files changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/blktrace.c b/blktrace.c
> index 26b3afd..2695a33 100644
> --- a/blktrace.c
> +++ b/blktrace.c
> @@ -1509,6 +1509,17 @@ static int set_vbuf(struct io_info *iop, int mode, size_t size)
>  	return 0;
>  }
>  
> +static void iop_close(struct io_info *iop)
> +{
> +	if (iop) {
> +		struct stat buf;
> +
> +		fclose(iop->ofp);
> +		if (!stat(iop->ofn, &buf) && (buf.st_size = 0))
> +			unlink(iop->ofn);
> +	}
> +}
> +
>  static int iop_open(struct io_info *iop, int cpu)
>  {
>  	iop->ofd = -1;
> @@ -1525,7 +1536,7 @@ static int iop_open(struct io_info *iop, int cpu)
>  	if (set_vbuf(iop, _IOLBF, FILE_VBUF_SIZE)) {
>  		fprintf(stderr, "set_vbuf for file %s failed: %d/%s\n",
>  			iop->ofn, errno, strerror(errno));
> -		fclose(iop->ofp);
> +		iop_close(iop);
>  		return 1;
>  	}
>  
> @@ -1548,8 +1559,7 @@ static void close_iop(struct io_info *iop)
>  		}
>  	}
>  
> -	if (iop->ofp)
> -		fclose(iop->ofp);
> +	iop_close(iop);
>  	if (iop->obuf)
>  		free(iop->obuf);
>  }
> -- 
> 1.5.6.3
> 


-- 
Jens Axboe