linux-ext4 - Re: [PATCH 3/3] 285: Test offsets over 4GB

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Date:	Thu, 30 May 2013 08:48:24 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Jan Kara <jack@...e.cz>
CC:	xfs@....sgi.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/3] 285: Test offsets over 4GB

On 5/30/13 7:45 AM, Jan Kara wrote:
> Test whether SEEK_HOLE and SEEK_DATA works correctly with offsets over
> 4GB.


Hm, should we add 2T as well while we're at it?

(and does this cause any new failures?)

-Eric

> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
>  src/seek_sanity_test.c | 38 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
> 
> diff --git a/src/seek_sanity_test.c b/src/seek_sanity_test.c
> index 7d5868b..55e7ed6 100644
> --- a/src/seek_sanity_test.c
> +++ b/src/seek_sanity_test.c
> @@ -18,6 +18,7 @@
>   */
>  
>  #define _XOPEN_SOURCE 500
> +#define _FILE_OFFSET_BITS 64
>  #include <sys/types.h>
>  #include <sys/stat.h>
>  #include <sys/vfs.h>
> @@ -191,6 +192,42 @@ static int do_lseek(int testnum, int subtest, int fd, int filsz, int origin,
>  	return ret;
>  }
>  
> +/* test a huge file to check for 4G overflows */
> +static int test10(int fd, int testnum)
> +{
> +	char *buf = NULL;
> +	int bufsz = alloc_size;
> +	off_t filsz = 8ULL << 30;	/* 8G */
> +	off_t off = filsz - 2*bufsz;
> +	int ret = -1;
> +
> +	buf = do_malloc(bufsz);
> +	if (!buf)
> +		goto out;
> +	memset(buf, 'a', bufsz);
> +
> +	ret = do_pwrite(fd, buf, bufsz, 0);
> +	if (ret)
> +		goto out;
> +	ret = do_pwrite(fd, buf, bufsz, off);
> +	if (ret)
> +		goto out;
> +
> +	/* offset at the beginning */
> +	ret += do_lseek(testnum,  1, fd, filsz, SEEK_HOLE, 0, bufsz);
> +	ret += do_lseek(testnum,  2, fd, filsz, SEEK_HOLE, 1, bufsz);
> +	ret += do_lseek(testnum,  3, fd, filsz, SEEK_DATA, 0, 0);
> +	ret += do_lseek(testnum,  4, fd, filsz, SEEK_DATA, 1, 1);
> +
> +	/* offset around eof */
> +	ret += do_lseek(testnum,  5, fd, filsz, SEEK_HOLE, off, off + bufsz);
> +	ret += do_lseek(testnum,  6, fd, filsz, SEEK_DATA, off, off);
> +	ret += do_lseek(testnum,  7, fd, filsz, SEEK_DATA, off + 1, off + 1);
> +
> +out:
> +	do_free(buf);
> +	return ret;
> +}
>  /*
>   * test file with unwritten extents, have both dirty and
>   * writeback pages in page cache.
> @@ -577,6 +614,7 @@ struct testrec seek_tests[] = {
>         {  7, test07, "Test file with unwritten extents, only have dirty pages" },
>         {  8, test08, "Test file with unwritten extents, only have unwritten pages" },
>         {  9, test09, "Test file with unwritten extents, have both dirty && unwritten pages" },
> +       { 10, test10, "Test a huge file" },
>  };
>  
>  static int run_test(struct testrec *tr)
> 

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