linux-kernel - Re: [PATCH] [GFS2] Remove i_mode passing from NFS File Handle

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Date:	Tue, 10 Jul 2007 11:01:55 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com,
	Wendy Cheng <wcheng@...hat.com>
Subject: Re: [PATCH] [GFS2] Remove i_mode passing from NFS File Handle

Hi,

On Tue, 2007-07-10 at 10:06 +0100, Christoph Hellwig wrote:
> > -#define GFS2_LARGE_FH_SIZE 10
> > -
> > -struct gfs2_fh_obj {
> > -	struct gfs2_inum_host this;
> > -	u32 imode;
> > -};
> > +#define GFS2_LARGE_FH_SIZE 8
> 
> Because gfs2_decode_fh only accepts file handles with GFS2_LARGE_FH_SIZE
> or GFS2_LARGE_FH_SIZE you don't accept filehandles sent out by and older
> gfs version anymore.  Stale filehandles because of a new kernel version
> are a big no-no, so please add back code to handle the old filehandles
> on the decode side.
> 

This should fix that problem I think since its only relating to end of
the fh we can just ignore that field in order to accept the older
format,

Steve.

diff --git a/fs/gfs2/ops_export.c b/fs/gfs2/ops_export.c
index e317db2..99ea565 100644
--- a/fs/gfs2/ops_export.c
+++ b/fs/gfs2/ops_export.c
@@ -28,6 +28,7 @@
 
 #define GFS2_SMALL_FH_SIZE 4
 #define GFS2_LARGE_FH_SIZE 8
+#define GFS2_OLD_FH_SIZE 10
 
 static struct dentry *gfs2_decode_fh(struct super_block *sb,
 				     __u32 *p,
@@ -44,6 +45,7 @@ static struct dentry *gfs2_decode_fh(struct super_block *sb,
 
 	switch (fh_len) {
 	case GFS2_LARGE_FH_SIZE:
+	case GFS2_OLD_FH_SIZE:
 		parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
 		parent.no_formal_ino |= be32_to_cpu(fh[5]);
 		parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;


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