RE: [PATCH RFCv3 3/3] lib/test_printf: add test cases for '%pD'

[Justin He]

Hi Petr

> -----Original Message-----
> From: Petr Mladek <pmladek@xxxxxxxx>
> Sent: Monday, June 14, 2021 11:44 PM
> To: Justin He <Justin.He@xxxxxxx>
> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>; Sergey Senozhatsky
> <senozhatsky@xxxxxxxxxxxx>; Andy Shevchenko
> <andriy.shevchenko@xxxxxxxxxxxxxxx>; Rasmus Villemoes
> <linux@xxxxxxxxxxxxxxxxxx>; Jonathan Corbet <corbet@xxxxxxx>; Alexander
> Viro <viro@xxxxxxxxxxxxxxxxxx>; Linus Torvalds <torvalds@linux-
> foundation.org>; Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>; Eric
> Biggers <ebiggers@xxxxxxxxxx>; Ahmed S. Darwish <a.darwish@xxxxxxxxxxxxx>;
> linux-doc@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-
> fsdevel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH RFCv3 3/3] lib/test_printf: add test cases for '%pD'
>
> On Fri 2021-06-11 23:59:53, Jia He wrote:
> > After the behaviour of specifier '%pD' is changed to print full path
> > of struct file, the related test cases are also updated.
> >
> > Given the string is prepended from the end of the buffer, the check
> > of "wrote beyond the nul-terminator" should be skipped.
> >
> > Signed-off-by: Jia He <justin.he@xxxxxxx>
> > ---
> >  lib/test_printf.c | 26 +++++++++++++++++++++++++-
> >  1 file changed, 25 insertions(+), 1 deletion(-)
> >
> > diff --git a/lib/test_printf.c b/lib/test_printf.c
> > index ec0d5976bb69..3632bd6cf906 100644
> > --- a/lib/test_printf.c
> > +++ b/lib/test_printf.c
> > @@ -78,7 +80,7 @@ do_test(int bufsize, const char *expect, int elen,
> >             return 1;
> >     }
> >
> > -   if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE +
> PAD_SIZE - (written + 1))) {
> > +   if (!is_prepend_buf && memchr_inv(test_buffer + written + 1,
> FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
> >             pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-
> terminator\n",
> >                     bufsize, fmt);
> >             return 1;
> > @@ -496,6 +498,27 @@ dentry(void)
> >     test("  bravo/alfa|  bravo/alfa", "%12pd2|%*pd2", &test_dentry[2],
> 12, &test_dentry[2]);
> >  }
> >
> > +static struct vfsmount test_vfsmnt = {};
> > +
> > +static struct file test_file __initdata = {
> > +   .f_path = { .dentry = &test_dentry[2],
> > +               .mnt = &test_vfsmnt,
> > +   },
> > +};
> > +
> > +static void __init
> > +f_d_path(void)
> > +{
> > +   test("(null)", "%pD", NULL);
> > +   test("(efault)", "%pD", PTR_INVALID);
> > +
> > +   is_prepend_buf = true;
> > +   test("/bravo/alfa   |/bravo/alfa   ", "%-14pD|%*pD", &test_file, -14,
> &test_file);
> > +   test("   /bravo/alfa|   /bravo/alfa", "%14pD|%*pD", &test_file, 14,
> &test_file);
> > +   test("   /bravo/alfa|/bravo/alfa   ", "%14pD|%-14pD", &test_file,
> &test_file);
>
> Please, add more test for scenarios when the path does not fit into
> the buffer or when there are no limitations, ...

Indeed, thanks


--
Cheers,
Justin (Jia He)



IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.