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From: Matteo Croce <mcroce@linux.microsoft.com>
To: JeffleXu <jefflexu@linux.alibaba.com>
Cc: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	"Lennart Poettering" <lennart@poettering.net>,
	"Luca Boccassi" <bluca@debian.org>,
	"Jens Axboe" <axboe@kernel.dk>,
	"Alexander Viro" <viro@zeniv.linux.org.uk>,
	"Damien Le Moal" <damien.lemoal@wdc.com>,
	"Tejun Heo" <tj@kernel.org>,
	"Javier González" <javier@javigon.com>,
	"Niklas Cassel" <niklas.cassel@wdc.com>,
	"Johannes Thumshirn" <johannes.thumshirn@wdc.com>,
	"Hannes Reinecke" <hare@suse.de>
Subject: Re: [PATCH -next 1/5] block: add disk sequence number
Date: Tue, 23 Mar 2021 18:43:34 +0100
Message-ID: <CAFnufp2E8ky_q10R5=zXsU+2ca53yQ=W+XOtKAq-c654xHCoEA@mail.gmail.com> (raw)
In-Reply-To: <7358d5ae-afd6-f0d9-5535-b1d7ecfbd785@linux.alibaba.com>

On Tue, Mar 16, 2021 at 2:44 AM JeffleXu <jefflexu@linux.alibaba.com> wrote:
>
> On 3/16/21 4:02 AM, Matteo Croce wrote:
> > From: Matteo Croce <mcroce@microsoft.com>
> >
> > Add a sequence number to the disk devices. This number is put in the
> > uevent so userspace can correlate events when a driver reuses a device,
> > like the loop one.
>
> Hi, I'm quite interested in this 'seqnum'. Actually I'm also planing to
> add support for some sort of 'seqnum' when supporting IO polling for dm
> devices, so that every time dm device changes its dm table, the seqnum
> will be increased.
>

Interesting, thanks!

> As for your patch, @diskseq is declared as one static variable in
> inc_diskseq(). Then I doubt if all callers of inc_diskseq() will share
> *one* counting when inc_diskseq() is compiled as the separate call entry
> rather than inlined.
>

That would be true if the static declaration was in the .h, but being
in genhd.c it goes in vmlinux once.
Maybe you get confused by the inc_diskseq prototype in the header
file, but the function body is in the .c

Regards,



--
per aspera ad upstream

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-15 20:02 [PATCH -next 0/5] block: add a sequence number to disks Matteo Croce
2021-03-15 20:02 ` [PATCH -next 1/5] block: add disk sequence number Matteo Croce
2021-03-15 20:18   ` Matthew Wilcox
2021-03-15 21:04     ` Matthew Wilcox
2021-03-15 21:32       ` Lennart Poettering
2021-03-25 17:29       ` Matteo Croce
2021-03-26  8:00         ` Hannes Reinecke
2021-03-25 20:58       ` Lennart Poettering
2021-03-16 14:13     ` Christoph Hellwig
2021-04-20 20:12       ` Lennart Poettering
2021-03-25 20:52     ` Lennart Poettering
2021-03-16  1:44   ` JeffleXu
2021-03-23 17:43     ` Matteo Croce [this message]
2021-03-15 20:02 ` [PATCH -next 2/5] block: add ioctl to read the " Matteo Croce
2021-03-15 20:13   ` Matthew Wilcox
2021-03-15 20:17     ` Damien Le Moal
2021-03-15 20:34     ` Matteo Croce
2021-03-15 20:02 ` [PATCH -next 3/5] block: refactor sysfs code Matteo Croce
2021-03-15 20:02 ` [PATCH -next 4/5] block: export diskseq in sysfs Matteo Croce
2021-03-15 20:02 ` [PATCH -next 5/5] loop: increment sequence number Matteo Croce

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