[PATCH] knfsd: Correct reserved reply space for read requests.

[NeilBrown <neilb@suse.de>]

Single patch for nfsd in 2.6.16.  As the comment say, it is sensible
for this to sit in -mm for a while just in case.

### Comments for Changeset

NFSd makes sure there is enough space to hold the maximum possible
reply before accepting a request.  The units for this maximum is
(4byte) words.  However in three places, particularly for read
request, the number given is a number of bytes.

This means too much space is reserved which is slightly wasteful.

This is the sort of patch that could uncover a deeper bug, and it is
not critical, so it would be best for it to spend a while in -mm before going in to mainline.

Discovered-by: "Eivind  Sarto" <ivan@kasenna.com>

Cc: "Eivind  Sarto" <ivan@kasenna.com>

Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
 ./fs/nfsd/nfs3proc.c |    2 +-
 ./fs/nfsd/nfs4proc.c |    2 +-
 ./fs/nfsd/nfsproc.c  |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff ./fs/nfsd/nfs3proc.c~current~ ./fs/nfsd/nfs3proc.c
--- ./fs/nfsd/nfs3proc.c~current~	2006-03-30 16:48:30.000000000 +1100
+++ ./fs/nfsd/nfs3proc.c	2006-03-30 16:48:58.000000000 +1100
@@ -682,7 +682,7 @@ static struct svc_procedure		nfsd_proced
   PROC(lookup,	 dirop,		dirop,		fhandle2, RC_NOCACHE, ST+FH+pAT+pAT),
   PROC(access,	 access,	access,		fhandle,  RC_NOCACHE, ST+pAT+1),
   PROC(readlink, readlink,	readlink,	fhandle,  RC_NOCACHE, ST+pAT+1+NFS3_MAXPATHLEN/4),
-  PROC(read,	 read,		read,		fhandle,  RC_NOCACHE, ST+pAT+4+NFSSVC_MAXBLKSIZE),
+  PROC(read,	 read,		read,		fhandle,  RC_NOCACHE, ST+pAT+4+NFSSVC_MAXBLKSIZE/4),
   PROC(write,	 write,		write,		fhandle,  RC_REPLBUFF, ST+WC+4),
   PROC(create,	 create,	create,		fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC),
   PROC(mkdir,	 mkdir,		create,		fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC),

diff ./fs/nfsd/nfs4proc.c~current~ ./fs/nfsd/nfs4proc.c
--- ./fs/nfsd/nfs4proc.c~current~	2006-03-30 16:48:30.000000000 +1100
+++ ./fs/nfsd/nfs4proc.c	2006-03-30 16:48:58.000000000 +1100
@@ -973,7 +973,7 @@ struct nfsd4_voidargs { int dummy; };
  */
 static struct svc_procedure		nfsd_procedures4[2] = {
   PROC(null,	 void,		void,		void,	  RC_NOCACHE, 1),
-  PROC(compound, compound,	compound,	compound, RC_NOCACHE, NFSD_BUFSIZE)
+  PROC(compound, compound,	compound,	compound, RC_NOCACHE, NFSD_BUFSIZE/4)
 };
 
 struct svc_version	nfsd_version4 = {

diff ./fs/nfsd/nfsproc.c~current~ ./fs/nfsd/nfsproc.c
--- ./fs/nfsd/nfsproc.c~current~	2006-03-30 16:48:30.000000000 +1100
+++ ./fs/nfsd/nfsproc.c	2006-03-30 16:48:58.000000000 +1100
@@ -553,7 +553,7 @@ static struct svc_procedure		nfsd_proced
   PROC(none,	 void,		void,		none,		RC_NOCACHE, ST),
   PROC(lookup,	 diropargs,	diropres,	fhandle,	RC_NOCACHE, ST+FH+AT),
   PROC(readlink, readlinkargs,	readlinkres,	none,		RC_NOCACHE, ST+1+NFS_MAXPATHLEN/4),
-  PROC(read,	 readargs,	readres,	fhandle,	RC_NOCACHE, ST+AT+1+NFSSVC_MAXBLKSIZE),
+  PROC(read,	 readargs,	readres,	fhandle,	RC_NOCACHE, ST+AT+1+NFSSVC_MAXBLKSIZE/4),
   PROC(none,	 void,		void,		none,		RC_NOCACHE, ST),
   PROC(write,	 writeargs,	attrstat,	fhandle,	RC_REPLBUFF, ST+AT),
   PROC(create,	 createargs,	diropres,	fhandle,	RC_REPLBUFF, ST+FH+AT),