Open/create the last_rcvd file for MDS at filesystem mount time and close it

when we unmount the filesystem.  Also check error returns from mkdir on FH
and ROOT directories (ignore EEXIST only).

diff --git a/lustre/mds/handler.c b/lustre/mds/handler.c
index cc442ad..a2cb3b6 100644 (file)
--- a/lustre/mds/handler.c
+++ b/lustre/mds/handler.c
@@ -402,6 +402,7 @@ static int mds_prep(struct obd_device *obddev)
         struct obd_run_ctxt saved;
         struct mds_obd *mds = &obddev->u.mds;
         struct super_operations *s_ops;
+        struct file *f;
         int err;
 
         mds->mds_service = ptlrpc_init_svc(128 * 1024,
@@ -421,7 +422,21 @@ static int mds_prep(struct obd_device *obddev)
 
         push_ctxt(&saved, &mds->mds_ctxt);
         err = simple_mkdir(current->fs->pwd, "ROOT", 0700);
+        if (err && err != -EEXIST) {
+                CERROR("cannot create ROOT directory\n");
+                GOTO(err_svc, err);
+        }
         err = simple_mkdir(current->fs->pwd, "FH", 0700);
+        if (err && err != -EEXIST) {
+                CERROR("cannot create FH directory\n");
+                GOTO(err_svc, err);
+        }
+        f = filp_open("last_rcvd", O_RDWR | O_CREAT, 0644);
+        if (IS_ERR(f)) {
+                CERROR("cannot open/create last_rcvd file\n");
+                GOTO(err_svc, err = PTR_ERR(f));
+        }
+        mds->last_rcvd = f;
         pop_ctxt(&saved);
 
         /*
@@ -532,6 +547,13 @@ static int mds_cleanup(struct obd_device * obddev)
         if (!mds->mds_sb)
                 RETURN(0);
 
+        if (mds->last_rcvd) {
+                int rc = filp_close(mds->last_rcvd, 0);
+                mds->last_rcvd = NULL;
+
+                if (rc)
+                        CERROR("last_rcvd file won't close, rc=%d\n", rc);
+        }
         s_ops = sb->s_op;
 
         unlock_kernel();