Re: [PATCH] generic: test zero-byte writes to new file

["Darrick J. Wong" <djwong@kernel.org>]

On Thu, Feb 13, 2025 at 09:17:28PM -0600, Eric Sandeen wrote:
> On 2/13/25 2:50 PM, Eric Sandeen wrote:
> > On 2/13/25 1:51 PM, Darrick J. Wong wrote:
> 
> ...
> 
> >>> +rm -f $TEST_DIR/testfile.$seq
> >>> +$XFS_IO_PROG -f -c "pwrite 0 0" $TEST_DIR/testfile.$seq
> >>> +test -f $TEST_DIR/testfile.$seq || _fail "file not created"
> >>
> >> When does the file not get created?
> > 
> > In some unknown error case? ;)
> > There's probably no reason for that test, though of course
> > it's still expected to pass.
> > 
> > In the various discussions of the exfat bug scattered around
> > the internet people kept pointing out that "well, the file does
> > get created" so I probably had that on my mind.
> 
> To put a finer point on it, because I can't tell for sure - are
> you asking me to take that test out?

Nah, I was just wondering if there was something about the buggy exfat
code that either prevented the file from being created, or if the bug
was that the empty file got deleted after the zero-byte pwrite and I
misunderstood what's going on.

(IOWs I think this test is fine, but could the exfat maintainer
clarify?)

--D

> Thanks,
> -Eric
> 
>