Date: Tue, 28 Jun 2016 20:55:23 +0200 From: Edward Tomasz =?utf-8?Q?Napiera=C5=82a?= <trasz@FreeBSD.org> To: Hongjiang Zhang <honzhan@microsoft.com> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ufs freeze does not work Message-ID: <20160628185523.GA82035@brick> In-Reply-To: <SN2PR03MB2224903F61C7DD576EDDB05DB5220@SN2PR03MB2224.namprd03.prod.outlook.com> References: <CO2PR03MB2215FAA1AB86A669039B9540B5210@CO2PR03MB2215.namprd03.prod.outlook.com> <20160628065432.GA20716@brick> <SN2PR03MB2224903F61C7DD576EDDB05DB5220@SN2PR03MB2224.namprd03.prod.outlook.com>
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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. 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. >
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