=============================================================================
From 7adf0213b525c02761022c7fee60f52012d32a9a Mon Sep 17 00:00:00 2001
From: Mi Jinlong <mijinlong@cn.fujitsu.com>
Date: Mon, 4 Apr 2011 00:49:19 +0800
Subject: [PATCH] nfsd41: make sure nfs server process OPEN with EXCLUSIVE4_1 correcttly

NFS server can't process OPEN with EXCLUSIVE4_1, because NFS server call 
nfsd_create_v3 to create file instead implement a separate one. 
But nfsd_create_v3 can't process createmode is EXCLUSIVE4_1.

This patch rename nfsd_create_v3() to do_nfsd_create(), and add some codes
about process EXCLUSIVE4_1.

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
---
 fs/nfsd/nfs3proc.c |    2 +-
 fs/nfsd/nfs4proc.c |    4 ++--
 fs/nfsd/vfs.c      |   18 +++++++++++++-----
 fs/nfsd/vfs.h      |    2 +-
 4 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index 2247fc9..9095f3c 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -245,7 +245,7 @@ nfsd3_proc_create(struct svc_rqst *rqstp, struct nfsd3_createargs *argp,
 	}
 
 	/* Now create the file and set attributes */
-	nfserr = nfsd_create_v3(rqstp, dirfhp, argp->name, argp->len,
+	nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 				attr, newfhp,
 				argp->createmode, argp->verf, NULL, NULL);
 
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 5fcb139..e1d100f 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -196,9 +196,9 @@ do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_o
 
 		/*
 		 * Note: create modes (UNCHECKED,GUARDED...) are the same
-		 * in NFSv4 as in v3.
+		 * in NFSv4 as in v3 except EXCLUSIVE4_1.
 		 */
-		status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
+		status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 					open->op_fname.len, &open->op_iattr,
 					&resfh, open->op_createmode,
 					(u32 *)open->op_verf.data,
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 2e1cebd..fe8b818 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1341,10 +1341,10 @@ out_nfserr:
 
 #ifdef CONFIG_NFSD_V3
 /*
- * NFSv3 version of nfsd_create
+ * NFSv3 and NFSv4 version of nfsd_create
  */
 __be32
-nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
+do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		char *fname, int flen, struct iattr *iap,
 		struct svc_fh *resfhp, int createmode, u32 *verifier,
 	        int *truncp, int *created)
@@ -1389,7 +1389,7 @@ nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	if (err)
 		goto out;
 
-	if (createmode == NFS3_CREATE_EXCLUSIVE) {
+	if (createmode & NFS3_CREATE_EXCLUSIVE) {
 		/* solaris7 gets confused (bugid 4218508) if these have
 		 * the high bit set, so just clear the high bits. If this is
 		 * ever changed to use different attrs for storing the
@@ -1426,10 +1426,18 @@ nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
 			}
 			break;
 		case NFS3_CREATE_EXCLUSIVE:
+#ifdef CONFIG_NFSD_V4
+		case NFS4_CREATE_EXCLUSIVE4_1:
+#endif
 			if (   dchild->d_inode->i_mtime.tv_sec == v_mtime
 			    && dchild->d_inode->i_atime.tv_sec == v_atime
 			    && dchild->d_inode->i_size  == 0 )
-				break;
+#ifdef CONFIG_NFSD_V4
+				if (createmode == NFS4_CREATE_EXCLUSIVE4_1)
+					goto set_attr;
+				else
+#endif
+					break;
 			 /* fallthru */
 		case NFS3_CREATE_GUARDED:
 			err = nfserr_exist;
@@ -1448,7 +1456,7 @@ nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
 
 	nfsd_check_ignore_resizing(iap);
 
-	if (createmode == NFS3_CREATE_EXCLUSIVE) {
+	if (createmode & NFS3_CREATE_EXCLUSIVE) {
 		/* Cram the verifier into atime/mtime */
 		iap->ia_valid = ATTR_MTIME|ATTR_ATIME
 			| ATTR_MTIME_SET|ATTR_ATIME_SET;
diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index 9a370a5..10dbe9f 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -54,7 +54,7 @@ __be32		nfsd_create(struct svc_rqst *, struct svc_fh *,
 				int type, dev_t rdev, struct svc_fh *res);
 #ifdef CONFIG_NFSD_V3
 __be32		nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
-__be32		nfsd_create_v3(struct svc_rqst *, struct svc_fh *,
+__be32		do_nfsd_create(struct svc_rqst *, struct svc_fh *,
 				char *name, int len, struct iattr *attrs,
 				struct svc_fh *res, int createmode,
 				u32 *verifier, int *truncp, int *created);
