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

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Date:	Thu, 30 May 2013 22:01:18 +0200
From:	Jan Kara <jack@...e.cz>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Jan Kara <jack@...e.cz>, xfs@....sgi.com,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/3] 285: Test offsets over 4GB

On Thu 30-05-13 08:48:24, Eric Sandeen wrote:
> 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?)
  Yes, ext4 is broken. I've sent fixes for it yesterday. I'm not sure what
exactly would overflow at 2T ... block counts if signed int is used and
blocksize is 1KB?

								Honza

> > 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)
> > 
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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