linux-kernel - Re: [PATCH v5 2/4] lib/vsprintf.c: make '%pD' print the full path of file

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Date:   Tue, 22 Jun 2021 17:39:54 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Jia He <justin.he@....com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Eric Biggers <ebiggers@...gle.com>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@...radead.org>, nd@....com
Subject: Re: [PATCH v5 2/4] lib/vsprintf.c: make '%pD' print the full path of
 file

On Tue, Jun 22, 2021 at 10:06:32PM +0800, Jia He wrote:
> Previously, the specifier '%pD' is for printing dentry name of struct
> file. It may not be perfect (by default it only prints one component.)
> 
> As suggested by Linus [1]:

Citing is better looked when you shift right it by two white spaces.

> A dentry has a parent, but at the same time, a dentry really does
> inherently have "one name" (and given just the dentry pointers, you
> can't show mount-related parenthood, so in many ways the "show just
> one name" makes sense for "%pd" in ways it doesn't necessarily for
> "%pD"). But while a dentry arguably has that "one primary component",
> a _file_ is certainly not exclusively about that last component.
> 
> Hence change the behavior of '%pD' to print the full path of that file.
> 
> Precision is never going to be used with %p (or any of its kernel
> extensions) if -Wformat is turned on.

> Link: https://lore.kernel.org/lkml/CAHk-=wimsMqGdzik187YWLb-ru+iktb4MYbMQG1rnZ81dXYFVg@mail.gmail.com/ [1]


> 

Shouldn't be blank lines in the tag block. I have an impression that I have
commented on this already...

...

> -last components.  %pD does the same thing for struct file.
> +last components.  %pD prints full file path together with mount-related

I guess you may also convert double space to a single one.

> +parenthood.

-- 
With Best Regards,
Andy Shevchenko