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On Thu, Jul 25, 2013 at 08:13:19AM +0800, Zheng Liu wrote:
[...]
> > 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
>
> Sorry, I don't take a closer look at that thread. I look at the code,
> and it seems that there is no any rule about adding '#ifndef XXX'.
> Meanwhile, I notice a comment:
>
> /*
> * When introducing new O_* bits, please check its uniqueness in fcntl_init().
> */
>
> But we are missing adding O_TMPFILE flag in fcntl_init(). So I attach a
> patch below.
>
> Al, could you please answer this question? Thanks.
>
> Regards,
> - Zheng
>
> Subject: [PATCH] vfs: add missing check for __O_TMPFILE in fcntl_init()
>
> From: Zheng Liu <wenqing.lz@xxxxxxxxxx>
>
> As comment in include/uapi/asm-generic/fcntl.h described, when
> introducing new O_* bits, we need to check its uniqueness in
> fcntl_init(). But __O_TMPFILE bit is missing. So fix it.
>
> Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx>
Any comment?
Thanks,
- Zheng
> ---
> *This patch is against ext4/dev tree.*
>
> fs/fcntl.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/fcntl.c b/fs/fcntl.c
> index 6599222..65343c3 100644
> --- a/fs/fcntl.c
> +++ b/fs/fcntl.c
> @@ -730,14 +730,14 @@ static int __init fcntl_init(void)
> * Exceptions: O_NONBLOCK is a two bit define on parisc; O_NDELAY
> * is defined as O_NONBLOCK on some platforms and not on others.
> */
> - BUILD_BUG_ON(19 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32(
> + BUILD_BUG_ON(20 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32(
> O_RDONLY | O_WRONLY | O_RDWR |
> O_CREAT | O_EXCL | O_NOCTTY |
> O_TRUNC | O_APPEND | /* O_NONBLOCK | */
> __O_SYNC | O_DSYNC | FASYNC |
> O_DIRECT | O_LARGEFILE | O_DIRECTORY |
> O_NOFOLLOW | O_NOATIME | O_CLOEXEC |
> - __FMODE_EXEC | O_PATH
> + __FMODE_EXEC | O_PATH | __O_TMPFILE
> ));
>
> fasync_cache = kmem_cache_create("fasync_cache",
> --
> 1.7.9.7
>
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