Date: Wed, 11 Mar 2015 16:18:37 -0700 (PDT) From: Don Lewis <truckman@FreeBSD.org> To: mjguzik@gmail.com Cc: freebsd-hackers@FreeBSD.org, int0dster@gmail.com, oliver.pinter@hardenedbsd.org, shawn.webb@hardenedbsd.org Subject: Re: file system change notifications Message-ID: <201503112318.t2BNIboU092815@gw.catspoiler.org> In-Reply-To: <20150311224831.GB18699@dft-labs.eu>
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On 11 Mar, Mateusz Guzik wrote: > On Wed, Mar 11, 2015 at 11:11:14PM +0100, Oliver Pinter wrote: >> Take a look at dazuko kernel module. Probably you should forward port >> them, because they are obsoleted. >> > > I checked the module out of curiosity. Their approach was to wrap various > syscalls and work from there. This is used to be the common approach > several years back it has a lot of shortcomings, complete lack of > reliability being the biggest one. > > As for better implementation: current namecache does not guarantee name > resolution (even if name was entered) and not all names end up in the > cache in the first place. > > Lack of reliability comes from the fact that the cache does not pin > vnodes in any way. I seem to recall reading a long time ago that DragonFly pins directories in the cache, or something like that.
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