linux-kernel - Re: [RFC] fsfreeze: moving from uniterruptible to killable

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Message-ID: <CANGUGtDdhbS-7GJ4HDRTN3H-bHvNLGg6tdNsqgZbMGBCxmjjcw@mail.gmail.com>
Date:	Wed, 27 Mar 2013 16:41:02 +0100
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] fsfreeze: moving from uniterruptible to killable

2013/3/27 Jan Kara <jack@...e.cz>:
> On Wed 27-03-13 12:39:10, Marco Stornelli wrote:
>> 2013/3/26 Jan Kara <jack@...e.cz>:
>> > On Sun 24-03-13 10:10:59, Marco Stornelli wrote:
>> >> When a fs is frozen, a process can hang because we wait in
>> >> uniterruptible state. We give the user the possibility to kill the process.
>> >   Yes, but it needs slightly more work as you probably know... (bailing out
>> > properly when the signal arrives).
>> >
>> >                                                                 Honza
>> >
>>
>> Of course, indeed, it was only an RFC to start a discussion, not a
>> patch :) The point was: is this kind of change a behaviour that can
>> break user-space in some way? IMHO no, but I'd like to have a
>> discussion about that before to start coding. What do you think?
>   Killable wait is almost always safe WRT to userspace breakage. In this
> case I cannot see how it could matter. That's why I agree it's a good thing
> to do.
>
>                                                                 Honza

Yes, I quite agree. I'll try to look at it in a deeply way.

Regards,

Marco
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