[PATCH] Invalid notify_change(symlink, [ATTR_MODE]) in nfsd

Make sure NFS client doesn't see errors from mode setting on new symlinks.

When nfsd creates a symlink, it tries to set the mode as the mode is 
carried in the NFS request and some filesystems store a mode.

If the filesystem refuses to set the mode (e.g. -EOPNOTSUPP), this
error should not be returned to the client.

fs/nfsd/vfs.c

@@ -1219,16 +1219,18 @@ nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		if (EX_ISSYNC(fhp->fh_export))
 			nfsd_sync_dir(dentry);
 		if (iap) {
-			iap->ia_valid &= ATTR_MODE /* ~(ATTR_MODE|ATTR_UID|ATTR_GID)*/;
+			iap->ia_valid &= ATTR_MODE; /* Only the MODE ATTRibute is 
+						     * even vaguely meaningful */
 			if (iap->ia_valid) {
 				iap->ia_valid |= ATTR_CTIME;
 				iap->ia_mode = (iap->ia_mode&S_IALLUGO)
 					| S_IFLNK;
-				err = notify_change(dnew, iap);
-				if (err)
-					err = nfserrno(err);
-				else if (EX_ISSYNC(fhp->fh_export))
-					write_inode_now(dentry->d_inode, 1);
+				if (notify_change(dnew, iap)==0)
+					if (EX_ISSYNC(fhp->fh_export))
+						write_inode_now(dentry->d_inode, 1);
+				/* errors from notify_change are not
+				 * propagated to client
+				 */
 		       }
 		}
 	} else