ufs freeze does not work
honzhan at microsoft.com
Wed Oct 12 05:29:57 UTC 2016
I have another question about UFS suspend. Shall I call "sync" before freezing the fs? See it in my code.
Another question is do you think it is necessary for FreeBSD to provide a such tool? Is there any stat tool for user to know which file partition is freezed?
sync(); // Is this necessary?
error = ioctl(fso, UFSSUSPEND, &statfsp->f_fsid);
From: Edward Tomasz Napierała [mailto:etnapierala at gmail.com] On Behalf Of Edward Tomasz Napierala
Sent: Wednesday, June 29, 2016 12:32 PM
To: Mateusz Guzik <mjguzik at gmail.com>
Cc: Hongjiang Zhang <honzhan at microsoft.com>; freebsd-fs at freebsd.org
Subject: Re: ufs freeze does not work
On 0628T2157, Mateusz Guzik wrote:
> On Tue, Jun 28, 2016 at 08:55:23PM +0200, Edward Tomasz Napierała wrote:
> > As I said, the suspension is released when the ufssuspend file
> > descriptor gets closed - which is what happens when the calling
> > process exits. It's a protection mechanism, to avoid the situation
> > where the process malfunction (eg a crash) would leave the system in unrecoverable (suspended) state.
> > You probably want your process to just execute another one, and wait
> > until it exits.
> The example with freeze -f strongly hints this is supposed to work as
> a drop in replacement for linux scripts.
> As such, maybe ufs should grow another operation which does not
> automagically unfreeze.
I'm not sure it's a good idea to provide an inferior mechanism just for backward compatibility with Linux. Especially given how easy it is to do it properly, modeling the utility after eg lockf(1).
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