commit 37c593c57324740821766c56e48cf09776a68a9c
author Tigran Mkrtchyan <kofemann@gmail.com> Mon Feb 13 22:55:32 2012 +0100
committer J. Bruce Fields <bfields@redhat.com> Wed Feb 15 11:20:45 2012 -0500
tree 9c6f91acb532da56f5d5f24c2aa8a345f717c81a
parent 9428fe1abb672c67169d3b6abf0faa120f020c32

nfsd41: use current stateid by value

Signed-off-by: Tigran Mkrtchyan <kofemann@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/current_stateid.h

diff --git a/fs/nfsd/current_stateid.h b/fs/nfsd/current_stateid.h
index d8c9992..4123551 100644
--- a/fs/nfsd/current_stateid.h
+++ b/fs/nfsd/current_stateid.h
@@ -4,6 +4,7 @@
 #include "state.h"
 #include "xdr4.h"
 
+extern void clear_current_stateid(struct nfsd4_compound_state *cstate);
 /*
  * functions to set current state id
  */

fs/nfsd/nfs4proc.c

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 1ee0e7c..53636ff 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -453,7 +453,10 @@
 		return nfserr_restorefh;
 
 	fh_dup2(&cstate->current_fh, &cstate->save_fh);
-	cstate->current_stateid = cstate->save_stateid;
+	if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
+		memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
+		SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
+	}
 	return nfs_ok;
 }
 
@@ -465,7 +468,10 @@
 		return nfserr_nofilehandle;
 
 	fh_dup2(&cstate->save_fh, &cstate->current_fh);
-	cstate->save_stateid = cstate->current_stateid;
+	if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
+		memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
+		SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
+	}
 	return nfs_ok;
 }
 
@@ -1238,7 +1244,7 @@
 				opdesc->op_set_currentstateid(cstate, &op->u);
 
 			if (opdesc->op_flags & OP_CLEAR_STATEID)
-				cstate->current_stateid = NULL;
+				clear_current_stateid(cstate);
 
 			if (need_wrongsec_check(rqstp))
 				op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);

fs/nfsd/nfs4state.c

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 7b0b6f0..cf62079 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4699,15 +4699,23 @@
 static void
 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
 {
-	if (cstate->current_stateid && CURRENT_STATEID(stateid))
-		memcpy(stateid, cstate->current_stateid, sizeof(stateid_t));
+	if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
+		memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
 }
 
 static void
 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
 {
-	if (cstate->minorversion)
-		cstate->current_stateid = stateid;
+	if (cstate->minorversion) {
+		memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
+		SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
+	}
+}
+
+void
+clear_current_stateid(struct nfsd4_compound_state *cstate)
+{
+	CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 }
 
 /*

fs/nfsd/xdr4.h

diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 3c1ddd7..12789eb 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -43,6 +43,13 @@
 #define NFSD4_MAX_TAGLEN	128
 #define XDR_LEN(n)                     (((n) + 3) & ~3)
 
+#define CURRENT_STATE_ID_FLAG (1<<0)
+#define SAVED_STATE_ID_FLAG (1<<1)
+
+#define SET_STATE_ID(c, f) ((c)->sid_flags |= (f))
+#define HAS_STATE_ID(c, f) ((c)->sid_flags & (f))
+#define CLEAR_STATE_ID(c, f) ((c)->sid_flags &= ~(f))
+
 struct nfsd4_compound_state {
 	struct svc_fh		current_fh;
 	struct svc_fh		save_fh;
@@ -54,8 +61,10 @@
 	size_t			iovlen;
 	u32			minorversion;
 	u32			status;
-	const stateid_t	*current_stateid;
-	const stateid_t	*save_stateid;
+	stateid_t	current_stateid;
+	stateid_t	save_stateid;
+	/* to indicate current and saved state id presents */
+	u32		sid_flags;
 };
 
 static inline bool nfsd4_has_session(struct nfsd4_compound_state *cs)