[Pvfs2-users] Programming with PVFS2

[Aresky Aresky]

The problem has been fixed.Thanks a lot. I misunderstood the
documents.Maybeadding a small example  to the pvfs2-guide  will make
it a bit clear to some
new users like me:).

On 6/6/06, pvfs2-users-request at beowulf-underground.org <
pvfs2-users-request at beowulf-underground.org> wrote:
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> Today's Topics:
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>    1. How (Aresky Aresky)
>    2. Re: How (Nathan Poznick)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 5 Jun 2006 20:23:05 +0800
> From: "Aresky Aresky" <aresky at gmail.com>
> Subject: [Pvfs2-users] How
> To: Pvfs2-users at beowulf-underground.org
> Message-ID:
>         <de623fe0606050523h3503d3afo98c3138987d19637 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> As said in  pvfs2-guide, the system interface is implementd as a single
> library, called libpvfs2. It is a stateless API that has no concept of
> open(), close(), or file descriptors. We provide an implementation of the
> UNIX I/O interface for clients. This interface implements the traditional
> open, read, write, and close interface as well as providing the directory
> operations necessary for applications suah as ls to work.
> These statments  confused me .
> If these is a file, named 'pvfs2test', in the directory /mnt/pvfs2, how
> can
> I open, and read it. In c programming, we just need to do as follow:
> int fd, n;
> if (( fd = open("pvfs2test", O_RDONLY, 0)  == -1)
>     error("failure");
> read(fd, buff, BUFFSIZE);
>
> How can I do such things using PVFS2?  I just know I have to add include <
> pvfs2.h> to the code and use compile command such as gcc -o test.o
> test.c-L/usr/src/pvfs2/lib -lpvfs2.
>
> Thanks,
>
>
> aresky at gmail.com
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> ------------------------------
>
> Message: 2
> Date: Mon, 5 Jun 2006 08:55:48 -0500
> From: Nathan Poznick <kraken at wang-fu.org>
> Subject: Re: [Pvfs2-users] How
> To: pvfs2-users at beowulf-underground.org
> Message-ID: <20060605135548.GA21206 at tao.wang-fu.org>
> Content-Type: text/plain; charset="us-ascii"
>
> Thus spake Aresky Aresky:
> > These statments  confused me .
>
> You're getting 2 different things confused. The libpvfs2 that PVFS2
> provides is not suitable for use as a target for application developers.
>
> The I/O interface that is mentioned, is the Linux kernel module for
> PVFS2.  If you compile and install the kernel module on your client
> systems, you can use mount(8) to mount PVFS2 filesystems, and interact
> with them with open/read/write/close just as you normally would any
> other filesystem.
>
> I think perhaps the wording in section 5.1 of the PVFS2 guide could be
> reworded to be a bit clearer.
>
> --
> Nathan Poznick <kraken at wang-fu.org>
>
> There is no faculty of the human soul so persistent and universal as
> that of hatred. - Henry Ward Beecher
>
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