linux-kernel - Re: [PATCH 3/5] dm: support retrieving struct dm_target from struct dm

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Message-ID: <ZkTcHCM49DDqhaYD@redhat.com>
Date: Wed, 15 May 2024 12:00:28 -0400
From: Benjamin Marzinski <bmarzins@...hat.com>
To: Yang Yang <yang.yang@...o.com>
Cc: Alasdair Kergon <agk@...hat.com>, Mike Snitzer <snitzer@...nel.org>,
        Mikulas Patocka <mpatocka@...hat.com>, dm-devel@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] dm: support retrieving struct dm_target from struct
 dm_dev

On Wed, May 15, 2024 at 11:42:04AM -0400, Benjamin Marzinski wrote:
> When a target calls dm_get_device(), if it adds a new table device to
> t->devices, then it's the first target in this table to use that device.
> If flush_pass_around is set for this target, then it also sets
> sends_pass_around_flush. In __send_empty_flush() if the table has
> flush_pass_around set, when you iterate through the devices, you only

Err, "When you iterate through the *targets*, you only ..." In this
method you don't iterate through the list of devices (which is supposed
to be protected by t->devices_lock).

> call __send_empty_flush_bios() for the ones with sends_pass_around_flush
> set.
> 
> Or am I overlooking something?
> 
> -Ben