[PATCH] knfsd: nfsd4: fix open flag passing

Since nfsv4 actually keeps around the file descriptors it gets from open
(instead of just using them for a single read or write operation), we need to
make sure that we can do RDWR opens and not just RDONLY/WRONLY.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfsd/nfs4state.c

@@ -1790,10 +1790,10 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
 	} else {
 		/* Stateid was not found, this is a new OPEN */
 		int flags = 0;
+		if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
+			flags |= MAY_READ;
 		if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
-			flags = MAY_WRITE;
-		else
-			flags = MAY_READ;
+			flags |= MAY_WRITE;
 		status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
 		if (status)
 			goto out;

fs/nfsd/vfs.c

@@ -673,7 +673,10 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
 		goto out_nfserr;
 
 	if (access & MAY_WRITE) {
-		flags = O_WRONLY|O_LARGEFILE;
+		if (access & MAY_READ)
+			flags = O_RDWR|O_LARGEFILE;
+		else
+			flags = O_WRONLY|O_LARGEFILE;
 
 		DQUOT_INIT(inode);
 	}