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From: Christoph Hellwig <hch@infradead.org>
To: Matteo Croce <mcroce@linux.microsoft.com>
Cc: Christoph Hellwig <hch@infradead.org>,
	linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Jens Axboe <axboe@kernel.dk>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Lennart Poettering <lennart@poettering.net>,
	Luca Boccassi <bluca@debian.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Damien Le Moal <damien.lemoal@wdc.com>, Tejun Heo <tj@kernel.org>,
	Javier Gonz??lez <javier@javigon.com>,
	Niklas Cassel <niklas.cassel@wdc.com>,
	Johannes Thumshirn <johannes.thumshirn@wdc.com>,
	Hannes Reinecke <hare@suse.de>,
	Matthew Wilcox <willy@infradead.org>,
	JeffleXu <jefflexu@linux.alibaba.com>
Subject: Re: [PATCH v3 1/6] block: add disk sequence number
Date: Wed, 23 Jun 2021 15:28:43 +0100	[thread overview]
Message-ID: <YNNFGx8Su8rjhRUL@infradead.org> (raw)
In-Reply-To: <CAFnufp1gdag0rGQ8K4_2oB6_aC+EZgfgwd2eL4-AxpG0mK+_qQ@mail.gmail.com>

On Wed, Jun 23, 2021 at 03:10:21PM +0200, Matteo Croce wrote:
> I just didn't want to clobber that file namespace, as that is the only
> point where it's used.

It doesn't really clobber the file namespace.  Declaring it normally
at the top of the file makes it very clear we have global state.
Hiding it in a function just causes obsfucation.

> > Can you explain a little more why we need a global sequence count vs
> > a per-disk one here?
> 
> The point of the whole series is to have an unique sequence number for
> all the disks.
> Events can arrive to the userspace delayed or out-of-order, so this
> helps to correlate events to the disk.
> It might seem strange, but there isn't a way to do this yet, so I come
> up with a global, monotonically incrementing number.

Maybe add a comment to explain that?

  parent reply	other threads:[~2021-06-23 14:29 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-23 10:58 [PATCH v3 0/6] block: add a sequence number to disks Matteo Croce
2021-06-23 10:58 ` [PATCH v3 1/6] block: add disk sequence number Matteo Croce
2021-06-23 11:48   ` Christoph Hellwig
2021-06-23 13:10     ` Matteo Croce
2021-06-23 13:51       ` Lennart Poettering
2021-06-23 14:01         ` Hannes Reinecke
2021-06-23 14:07           ` Luca Boccassi
2021-06-23 14:21             ` Hannes Reinecke
2021-06-23 14:34               ` Luca Boccassi
2021-06-23 14:55               ` Lennart Poettering
2021-06-23 14:12           ` Lennart Poettering
2021-06-23 15:02             ` Hannes Reinecke
2021-06-23 15:34               ` Luca Boccassi
2021-06-23 15:48               ` Lennart Poettering
2021-06-23 14:28       ` Christoph Hellwig [this message]
2021-06-23 10:58 ` [PATCH v3 2/6] block: add ioctl to read the " Matteo Croce
2021-06-23 10:58 ` [PATCH v3 3/6] block: refactor sysfs code Matteo Croce
2021-06-23 11:52   ` Christoph Hellwig
2021-06-23 19:03     ` Matteo Croce
2021-06-24  6:12       ` Christoph Hellwig
2021-06-23 10:58 ` [PATCH v3 4/6] block: export diskseq in sysfs Matteo Croce
2021-06-23 10:58 ` [PATCH v3 5/6] block: increment sequence number Matteo Croce
2021-06-23 10:58 ` [PATCH v3 6/6] loop: " Matteo Croce
2021-06-23 11:57   ` Christoph Hellwig
2021-06-23 13:13     ` Luca Boccassi
2021-06-23 14:25       ` Christoph Hellwig
2021-06-23 15:29         ` Lennart Poettering
2021-06-24  6:11           ` Christoph Hellwig
2021-06-23 12:03 ` [PATCH v3 0/6] block: add a sequence number to disks Hannes Reinecke
2021-06-23 12:46   ` Luca Boccassi
2021-06-23 14:07   ` Lennart Poettering

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