Date: Tue, 28 Jun 2016 21:57:31 +0200 From: Mateusz Guzik <mjguzik@gmail.com> To: Hongjiang Zhang <honzhan@microsoft.com>, "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ufs freeze does not work Message-ID: <20160628195731.GA21323@dft-labs.eu> In-Reply-To: <20160628185523.GA82035@brick> References: <CO2PR03MB2215FAA1AB86A669039B9540B5210@CO2PR03MB2215.namprd03.prod.outlook.com> <20160628065432.GA20716@brick> <SN2PR03MB2224903F61C7DD576EDDB05DB5220@SN2PR03MB2224.namprd03.prod.outlook.com> <20160628185523.GA82035@brick>
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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. > On 0628T0733, Hongjiang Zhang wrote: > > I run "./freeze -f", the program should freeze the "/" file partition, but I can still write something to "/tmp" folder. > > > > -----Original Message----- > > From: Edward Tomasz Napierała [mailto:etnapierala@gmail.com] On Behalf Of Edward Tomasz Napierala > > Sent: Tuesday, June 28, 2016 2:55 PM > > To: Hongjiang Zhang <honzhan@microsoft.com> > > Cc: freebsd-fs@freebsd.org > > Subject: Re: ufs freeze does not work > > > > On 0627T0815, Hongjiang Zhang via freebsd-fs wrote: > > > Hi all, > > > > > > I wrote a test to freeze ufs, but it does not work even if the ioctl returns successful. What is the problem? > > > > What do you mean by 'does not work'? What happens, and what did you expect to happen? > > > > Regarding your example - remember that the filesystem gets automatically unsuspended as soon as you close the /dev/ufssuspend file descriptor. > > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" -- Mateusz Guzik <mjguzik gmail.com>
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