linux-kernel - Re: [PATCH 17/21] ceph: nfs re-export support

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Date:	Sat, 20 Jun 2009 11:12:27 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Sage Weil <sage@...dream.net>
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	greg@...ah.com
Subject: Re: [PATCH 17/21] ceph: nfs re-export support

Sage Weil wrote:
> +++ b/fs/staging/ceph/export.c
...
> +static struct dentry *ceph_fh_to_parent(struct super_block *sb, struct fid *fid,
> +				 int fh_len, int fh_type)
> +{
> +	u32 *fh = fid->raw;
> +	u64 ino = *(u64 *)fh;
> +	u32 hash = fh[2];
> +
> +	derr(10, "fh_to_parent %llx.%x\n", ino, hash);
> +
> +	if (fh_len < 6)
> +		return ERR_PTR(-ESTALE);
> +
> +	return __fh_to_dentry(sb, (struct ceph_export_item *)fh + 1,
> +			      fh_len/IPSZ - 1);
> +}

fid->raw could be 32-bit aligned, couldn't it?

#include <asm/unaligned.h>

	u64 ino = get_unaligned((u64 *)fh);

	derr(10, "fh_to_parent %llx.%x\n",
	     (unsigned long long)ino, hash);

(not tested)

I remember somebody saying that u64 should become unsigned long long on 
all architectures eventually; is there still such a plan?
-- 
Stefan Richter
-=====-==--= -==- =-=--
http://arcgraph.de/sr/
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