linux-kernel - Re: [PATCH 19/21] ceph: ioctls

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Message-ID: <Pine.LNX.4.64.0910020840180.16283@cobra.newdream.net>
Date:	Fri, 2 Oct 2009 08:55:27 -0700 (PDT)
From:	Sage Weil <sage@...dream.net>
To:	Andi Kleen <andi@...stfloor.org>
cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, yehuda@...dream.net
Subject: Re: [PATCH 19/21] ceph: ioctls

On Fri, 2 Oct 2009, Andi Kleen wrote:

> Sage Weil <sage@...dream.net> writes:
> > +/*
> > + * Extract identity, address of the OSD and object storing a given
> > + * file offset.
> > + */
> > +struct ceph_ioctl_dataloc {
> > +	__u64 file_offset;           /* in+out: file offset */
> > +	__u64 object_offset;         /* out: offset in object */
> > +	__u64 object_no;             /* out: object # */
> > +	__u64 object_size;           /* out: object size */
> > +	char object_name[64];        /* out: object name */
> > +	__u64 block_offset;          /* out: offset in block */
> > +	__u64 block_size;            /* out: block length */
> > +	__s64 osd;                   /* out: osd # */
> > +	struct sockaddr_in osd_addr; /* out: osd address */
> 
> You'll have to revise that once you support IPv6. At least extend the structure
> better now? (_in is too small for IPv6)

Yes.  I suspect an explicit

	struct in6_addr osd_addr;
	__be16 osd_port;

makes more sense.  Then legacy IPv4 addresses can just be represented as 
::ffff:1.2.3.4.  That seems like the simplest route?

I should similarly update the struct ceph_entity_addr as well (it also 
embeds a sockaddr_in).  And/or embed that struct here.

sage
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