harryxiyou <[email protected]> writes:
> Hi Wouter,
>
> I have some questions to ask you, which are like following.
>
> 1, Pavel said "Unlike NFS, it is possible to put any file system on it. But
> (also unlike NFS), if someone has mounted NBD read/write, you must
> assure that no one else will have it mounted. " on his own page. The
> URL is http://atrey.karlin.mff.cuni.cz/~pavel/nbd/nbd.html . But i can not
> understand '' if someone has mounted NBD read/write, you must
> assure that no one else will have it mounted.". What is exact meaning of
> this sentence.
> One of my thoughts looks like this. We have two users, a1
> and a2 , who
> have logined into a Linux OS. If a1 mounted NBD read/write, a2 must not
> mount it currently, right?
More like Host1 and Host2. Although there are several filesystems out
there that specifically are designed for multiple hosts to mount it
(gfs, ocfs, ...).
> 2, I have seen the main function of nbd-server.c, which version is nbd-2.9.15.
> Some stuffs confuse me like following.
> 1> 1882 line: memset(pidftemplate, '\0', 256);
> I just see pidftemplate is used in the daemon function.
> But i am not
> sure what the pid file is used for. And also i don't know the meaning
> of
> this daemon function in nbd-server.c.
>
> 2> 1873: SERVER *server;
> If we have (server != NULL && (0 == server->port)) we will
> execute inetd
> mode. I have searched the characters of inetd but i am not sure what
> the
> meanings of inetd in our nbd-server.c do. And in what
> situations, we will do
> the inetd mode, which should do what jobs?
You can have nbd-server running as standalone server or have inetd start
it on demand.
> 3> 1928: dousers();
> I just tracked this function. It looks like it will set
> the running group and
> user informations. Why should we do this? Is it related to what
> pavel said
> "if someone has mounted NBD read/write, you must assure that no one
> else
> will have it mounted". Right ?
>
> This time, i just ask these questions. If i have other ones, i will
> send to you ;D
> Thanks very much, Wouter.
>
> --
> Thanks
> Harry Wei
MfG
Goswin
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