Date: Tue, 4 Jun 2019 02:03:05 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Alan Somers <asomers@freebsd.org> Cc: Peter Eriksson <pen@lysator.liu.se>, "freebsd-fs@freebsd.org" <freebsd-fs@FreeBSD.org> Subject: Re: RFC: should an incremental reload of exports for mountd be optional? Message-ID: <YQXPR01MB31282677E81686BBF2290A28DD150@YQXPR01MB3128.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <CAOtMX2i-mZfLVuZx5KZ1LJiwMFB7%2BnduF=wtgFJy5x=JnOM0MQ@mail.gmail.com> References: <QB1PR01MB2643E5186098E2AF14934866DD190@QB1PR01MB2643.CANPRD01.PROD.OUTLOOK.COM> <D685FA4E-0F35-44F8-B341-CF59122E10B9@lysator.liu.se> <CAOtMX2hs-aQgEZaCQjNdMHuL8qxJTqnnvNQ%2BysRcpFFTEtDb1A@mail.gmail.com> <YQXPR01MB31289FF0AC8633D372C814A2DD140@YQXPR01MB3128.CANPRD01.PROD.OUTLOOK.COM> <CAOtMX2i23Gup6EZvVB9rL9HcCRarMroD=-O6W_OfDV_0Uz5n_Q@mail.gmail.com> <YQXPR01MB3128E549A195DF4B8DAD191BDD150@YQXPR01MB3128.CANPRD01.PROD.OUTLOOK.COM>, <CAOtMX2i-mZfLVuZx5KZ1LJiwMFB7%2BnduF=wtgFJy5x=JnOM0MQ@mail.gmail.com>
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Alan Somers wrote: >On Mon, Jun 3, 2019 at 6:30 PM Rick Macklem <rmacklem@uoguelph.ca> wrote: >> >> Alan Somers wrote: >> >Will a restart of the daemon cause clients to get HUPped if they try >> >to access an exported filesystem while mountd is restarting? >> >-Alan >> I'm not sure what you mean by HUPped, but during a restart of mountd, ex= tant >> mounts should continue to work. > >Perhaps it wasn't SIGHUP, but I recall that a few years ago there was >a problem where all NFS I/O would fail while mountd was reloading. I >think it's the problem that you fixed in r241568. So long as the "-S" option is being specified, there shouldn't be a problem= . With "-S" both the initial load when started/restarted and a reload due to = SIGHUP will suspend the nfsd threads while deleting/loading exports in the kernel. The patch just committed was mainly to make the duration of suspension duri= ng a reload much shorter. rick [stuff snipped]
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