linux-kernel - RE: [PATCH 09/14] d_path: introduce struct prepend

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Date:   Fri, 25 Jun 2021 00:43:22 +0000
From:   Justin He <Justin.He@....com>
To:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>
CC:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Corbet <corbet@....net>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ira Weiny <ira.weiny@...el.com>,
        Eric Biggers <ebiggers@...gle.com>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>, nd <nd@....com>
Subject: RE: [PATCH 09/14] d_path: introduce struct prepend_buffer

Hi Enrico

> -----Original Message-----
> From: Enrico Weigelt, metux IT consult <lkml@...ux.net>
> Sent: Thursday, June 24, 2021 5:30 PM
> To: Justin He <Justin.He@....com>; Al Viro <viro@...iv.linux.org.uk>; Linus
> Torvalds <torvalds@...ux-foundation.org>
> Cc: Petr Mladek <pmladek@...e.com>; Steven Rostedt <rostedt@...dmis.org>;
> Sergey Senozhatsky <senozhatsky@...omium.org>; Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com>; Rasmus Villemoes
> <linux@...musvillemoes.dk>; Jonathan Corbet <corbet@....net>; Heiko
> Carstens <hca@...ux.ibm.com>; Vasily Gorbik <gor@...ux.ibm.com>; Christian
> Borntraeger <borntraeger@...ibm.com>; Eric W . Biederman
> <ebiederm@...ssion.com>; Darrick J. Wong <darrick.wong@...cle.com>; Peter
> Zijlstra (Intel) <peterz@...radead.org>; Ira Weiny <ira.weiny@...el.com>;
> Eric Biggers <ebiggers@...gle.com>; Ahmed S. Darwish
> <a.darwish@...utronix.de>; open list:DOCUMENTATION <linux-
> doc@...r.kernel.org>; Linux Kernel Mailing List <linux-
> kernel@...r.kernel.org>; linux-s390 <linux-s390@...r.kernel.org>; linux-
> fsdevel <linux-fsdevel@...r.kernel.org>
> Subject: Re: [PATCH 09/14] d_path: introduce struct prepend_buffer
> 
> Hi folks,
> 
> <snip>
> 
> >>         We've a lot of places where we have pairs of form (pointer to
> end
> >> of buffer, amount of space left in front of that).  These sit in pairs
> of
> >> variables located next to each other and usually passed by reference.
> >> Turn those into instances of new type (struct prepend_buffer) and pass
> >> reference to the pair instead of pairs of references to its fields.
> >>
> >> Declared and initialized by DECLARE_BUFFER(name, buf, buflen).
> >>
> >> extract_string(prepend_buffer) returns the buffer contents if
> >> no overflow has happened, ERR_PTR(ENAMETOOLONG) otherwise.
> >> All places where we used to have that boilerplate converted to use
> >> of that helper.
> 
> this smells like a generic enough thing to go into lib, doesn't it ?
> 
Maybe, but the struct prepend_buffer also needs to be moved into lib.
Is it necessary? Is there any other user of struct prepend_buffer?

--
Cheers,
Justin (Jia He)