fs/9p: We should not allocate a new inode when creating hardlines.

Don't do new_inode_from fid in case of hardlink creation. This ensures
that link count for hardlink files get updated properly. Earlier link count
was not updated on removing a hardlink with cache mode enabled.
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NEric Van Hensbergen <ericvh@gmail.com>

fs/9p/vfs_inode.c

@@ -680,26 +680,31 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
 		goto error;
 	}
 
+	if (!(perm & P9_DMLINK)) {
 		/* now walk from the parent so we can get unopened fid */
 		fid = p9_client_walk(dfid, 1, &name, 1);
 		if (IS_ERR(fid)) {
 			err = PTR_ERR(fid);
-		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
+			p9_debug(P9_DEBUG_VFS,
+				   "p9_client_walk failed %d\n", err);
 			fid = NULL;
 			goto error;
 		}
-
-	/* instantiate inode and assign the unopened fid to the dentry */
+		/*
+		 * instantiate inode and assign the unopened fid to the dentry
+		 */
 		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 		if (IS_ERR(inode)) {
 			err = PTR_ERR(inode);
-		p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
+			p9_debug(P9_DEBUG_VFS,
+				   "inode creation failed %d\n", err);
 			goto error;
 		}
 		err = v9fs_fid_add(dentry, fid);
 		if (err < 0)
 			goto error;
 		d_instantiate(dentry, inode);
+	}
 	return ofid;
 error:
 	if (ofid)