Date: Mon, 24 Oct 2016 21:52:12 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Ben Whaley <bwhaley@gmail.com> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: NFSv4 exports confusion Message-ID: <YTXPR01MB01895ED9A49540B49BFB22C0DDA90@YTXPR01MB0189.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <CAOfR73jet5vB4XgyE%2B8qUDjGxD5-nQiA=icWeSU96hLkLFLFUQ@mail.gmail.com> References: <CAOfR73h=cqd5L_=We5yABoiDx7zbmu=guSQJRa8aF3L_-YW%2BfQ@mail.gmail.com> <YTXPR01MB0189DB96028EFB59128F6C03DDD60@YTXPR01MB0189.CANPRD01.PROD.OUTLOOK.COM>, <CAOfR73jet5vB4XgyE%2B8qUDjGxD5-nQiA=icWeSU96hLkLFLFUQ@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Ben Whaley wrote: > Thank you, Rick, for taking the time to reply. > > In an NFSv4 server, is it possible to have multiple exports on the same > filesystem but not under the same tree without exposing the top level > directory? No. The same is actually true for NFSv3, except that the Mount command won'= t translate the path to an FH for the mount. (Or, the NFSv3 client must find = it via a Lookup on "..", which clients won't normally do.) > > E.g. if you wanted to export the following without also exporting / > > /path/to/export1 > /anotherpath/to/export2 > > Assuming export1 and export2 are both on the same server filesystem, coul= d > they both be exported without exporting / as the NFSv4 root? Again, no. > Also, exports(5) says: > > > The third form has the string ``V4:=92=92 followed by a single absolute= path > name, to specify the NFSv4 tree root. > This line does not export any fi= le > system, but simply marks where the root of the server=92s directory tree = is > for > NFSv4 clients. > > Yet the V4 root seems to behave like a =93normal=94 export with the -alld= irs > option. A V4 client can mount the V4 root and any subdirectory under it, > whether the subdir was exported or not. Am I misunderstanding what the ma= n > page says? No, if you created a /etc/exports with only a "V4:" line, no file system w= ould be exported. (You might be able to mount, but you wouldn't be able to do much = of anything with it. I don't think even a Readdir/ls works. It just allows Loo= kup and a few other Ops, so that the mount can work without all the parent files sy= stems being exported.) It is the line that exports any path in the file system that exports that f= ile system. ie. It is the /path/to/export that exports everything in that file system. --> So, yes, it is like all export lines except the "V4:" line have "-alldi= rs" on them. rick
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?YTXPR01MB01895ED9A49540B49BFB22C0DDA90>