linux-kernel - Re: [PATCH v2 0/4] make '%pD' print the full path of file

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Date:   Wed, 23 Jun 2021 12:17:34 +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 v2 0/4] make '%pD' print the full path of file

On Wed, Jun 23, 2021 at 01:50:07PM +0800, Jia He wrote:
> Background
> ==========
> Linus suggested printing the full path of file instead of printing
> the components as '%pd'.
> 
> Typically, there is no need for printk specifiers to take any real locks
> (ie mount_lock or rename_lock). So I introduce a new helper
> d_path_unsafe() which is similar to d_path() except it doesn't take any
> seqlock/spinlock.
> 
> This series is based on Al Viro's d_path() cleanup patches [1] which
> lifted the inner lockless loop into a new helper. 
> 
> Test
> ====
> The cases I tested:
> 1. print '%pD' with full path of ext4 file
> 2. mount a ext4 filesystem upon a ext4 filesystem, and print the file
>    with '%pD'
> 3. all test_print selftests, including the new '%14pD' '%-14pD'
> 4. kasprintf
> 
> TODO
> ====
> I plan to do the followup work after '%pD' behavior is changed.
> - s390/hmcdrv: remove the redundant directory path in printing string.
> - fs/iomap: simplify the iomap_swapfile_fail() with '%pD'.
> - simplify the string printing when file_path() is invoked(in some
>   cases, not all).
> - change the previous '%pD[2,3,4]' to '%pD'
>    
> Changelog
> =========
> v2:

Should be v6 now. So, next v7, otherwise you confuse bots and people.

My remark was for you for the future submission, this one is already spoiled.

> - refine the commit msg/comments (Andy)
> - pass the validator check by "make C=1 W=1"
> - add the R-b for patch 4/4 from Andy

-- 
With Best Regards,
Andy Shevchenko