linux-ext4 - Re: [PATCH] ext4: fix a bug when we try to open a file with O

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Date:	Wed, 24 Jul 2013 21:58:45 +0000
From:	jon ernst <jonernst07@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: fix a bug when we try to open a file with O_TMPFILE flag

> My purpose is to trigger this bug and fix it.  So I manually define this
> flag for my convenience.
>
>> I saw it has
>> been defined in header file. (fcntl.h) Did I miss anything?
>
> I guess that you might 'include <fcntl.h>' header file, right?  But the
> O_TMPFILE is defined in $LINUX/include/uapi/asm-generic/fcntl.h.  So
> maybe compiler couldn't find this header file.
>
> Regards,
>                                                 - Zheng
--
Got it. Thank you.  BTW, the weird thing is I didn't see any
discussion on ext4 mailing list before Al Viro committed this change.
The first time I heard about this is someone reporting a bug about it.
Document about this FLAG might be necessary.
Also, about this code:

/* a horrid kludge trying to make sure that this will fail on old kernels */
#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)

why not doing something like this:

#ifndef O_TMPFILE
/* a horrid kludge trying to make sure that this will fail on old kernels */
#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
#endif

Thanks,
Jon
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