linux-ext4 - Re: [PATCH] xfstests 224: test aio hole-fill at 4g

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Date:	Sat, 30 Jan 2010 10:15:09 -0600
From:	Eric Sandeen <sandeen@...deen.net>
To:	Christoph Hellwig <hch@...radead.org>
CC:	ext4 development <linux-ext4@...r.kernel.org>,
	xfs-oss <xfs@....sgi.com>, Giel de Nijs <giel@...torwise.com>
Subject: Re: [PATCH] xfstests 224: test aio hole-fill at 4g

Christoph Hellwig wrote:
> On Fri, Jan 29, 2010 at 02:05:46PM -0600, Eric Sandeen wrote:
>> Testcase from Giel de Nijs <giel@...torwise.com>
>> on linux-ext4 list, ""Possible ext4 data corruption
>> with large files and async I/O," on 29 Jan 2010
>>
>> ext4 put byte offsets in a block offset u32 container
>> in the endio struct, so 4g wrapped to 0 leading to
>> data corruption when the unwritten extent did not
>> get converted.
> 
> There's various type messups in the test program that make it fail for

oops, thanks for checking.

> me on a 32-bit machine.  The patch below fixes it up, but it seems like
> we should rather add a variant of that code as aio_read/write commands
> to xfs_io instead of adding a new test program.

ok, that's probably better - again, though, it takes at least a release
cycle before most folks can test it.  But I guess that's not the end of
the world.

-Eric

> Index: xfstests-dev/src/aio-write.c
> ===================================================================
> --- xfstests-dev.orig/src/aio-write.c	2010-01-30 10:42:24.000000000 +0000
> +++ xfstests-dev/src/aio-write.c	2010-01-30 10:45:30.000000000 +0000
> @@ -42,7 +42,7 @@ void usage(void)
>  /*
>   * Scale value by kilo, mega, or giga.
>   */
> -loff_t scale_by_kmg(long long value, char scale)
> +long long scale_by_kmg(long long value, char scale)
>  {
>  switch (scale) {
>  	case 'g':
> @@ -69,7 +69,7 @@ switch (scale) {
>  int main(int argc, char ** argv)
>  {
>  	char filename[PATH_MAX];
> -	loff_t offset = 0;
> +	long long offset = 0;
>  	size_t length = 0;
>  	int seed = 0xFF;
>  	int queue_depth = 8;
> @@ -95,12 +95,12 @@ int main(int argc, char ** argv)
>  			seed = (int)strtol(optarg, &endp, 0);
>  			break;
>  		case 'o':
> -			offset = strtol(optarg, &endp, 0);
> -			offset = scale_by_kmg((long long)offset, *endp);
> +			offset = strtoll(optarg, &endp, 0);
> +			offset = scale_by_kmg(offset, *endp);
>  			break;
>  		case 'l':
>  			length = strtol(optarg, &endp, 0);
> -			length = scale_by_kmg((long long)length, *endp);
> +			length = scale_by_kmg(length, *endp);
>  			break;
>  		case 'v':
>  			verbose++;
> @@ -141,7 +141,8 @@ int main(int argc, char ** argv)
>  	io_prep_pwrite(&iocb, fd, buf, length, offset);
>  	iocblist[0] = &iocb;
>  	if (verbose)
> -		printf("submitting write of %zd bytes at offset %zd\n", length, offset);
> +		printf("submitting write of %zd bytes at offset %lld\n",
> +			length, offset);
>  	err = io_submit(io_ctx, 1, iocblist);
>  	if (err < 0) {
>  		printf("error submitting I/O requests: %s\n", strerror(-err));
> 

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