Initial import

1 files changed, 262 insertions, 0 deletions

diff --git a/drivers/staging/lustre/lustre/obdclass/llog_obd.c b/drivers/staging/lustre/lustre/obdclass/llog_obd.c
new file mode 100644
index 000000000..978d886a1
--- /dev/null
+++ b/drivers/staging/lustre/lustre/obdclass/llog_obd.c
@@ -0,0 +1,262 @@
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ */
+
+#define DEBUG_SUBSYSTEM S_LOG
+
+
+#include "../include/obd_class.h"
+#include "../include/lustre_log.h"
+#include "llog_internal.h"
+
+/* helper functions for calling the llog obd methods */
+static struct llog_ctxt *llog_new_ctxt(struct obd_device *obd)
+{
+	struct llog_ctxt *ctxt;
+
+	OBD_ALLOC_PTR(ctxt);
+	if (!ctxt)
+		return NULL;
+
+	ctxt->loc_obd = obd;
+	atomic_set(&ctxt->loc_refcount, 1);
+
+	return ctxt;
+}
+
+static void llog_ctxt_destroy(struct llog_ctxt *ctxt)
+{
+	if (ctxt->loc_exp) {
+		class_export_put(ctxt->loc_exp);
+		ctxt->loc_exp = NULL;
+	}
+	if (ctxt->loc_imp) {
+		class_import_put(ctxt->loc_imp);
+		ctxt->loc_imp = NULL;
+	}
+	OBD_FREE_PTR(ctxt);
+}
+
+int __llog_ctxt_put(const struct lu_env *env, struct llog_ctxt *ctxt)
+{
+	struct obd_llog_group *olg = ctxt->loc_olg;
+	struct obd_device *obd;
+	int rc = 0;
+
+	spin_lock(&olg->olg_lock);
+	if (!atomic_dec_and_test(&ctxt->loc_refcount)) {
+		spin_unlock(&olg->olg_lock);
+		return rc;
+	}
+	olg->olg_ctxts[ctxt->loc_idx] = NULL;
+	spin_unlock(&olg->olg_lock);
+
+	obd = ctxt->loc_obd;
+	spin_lock(&obd->obd_dev_lock);
+	/* sync with llog ctxt user thread */
+	spin_unlock(&obd->obd_dev_lock);
+
+	/* obd->obd_starting is needed for the case of cleanup
+	 * in error case while obd is starting up. */
+	LASSERTF(obd->obd_starting == 1 ||
+		 obd->obd_stopping == 1 || obd->obd_set_up == 0,
+		 "wrong obd state: %d/%d/%d\n", !!obd->obd_starting,
+		 !!obd->obd_stopping, !!obd->obd_set_up);
+
+	/* cleanup the llog ctxt here */
+	if (CTXTP(ctxt, cleanup))
+		rc = CTXTP(ctxt, cleanup)(env, ctxt);
+
+	llog_ctxt_destroy(ctxt);
+	wake_up(&olg->olg_waitq);
+	return rc;
+}
+EXPORT_SYMBOL(__llog_ctxt_put);
+
+int llog_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
+{
+	struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
+	struct obd_llog_group *olg;
+	int rc, idx;
+
+	LASSERT(ctxt != NULL);
+	LASSERT(ctxt != LP_POISON);
+
+	olg = ctxt->loc_olg;
+	LASSERT(olg != NULL);
+	LASSERT(olg != LP_POISON);
+
+	idx = ctxt->loc_idx;
+
+	/*
+	 * Banlance the ctxt get when calling llog_cleanup()
+	 */
+	LASSERT(atomic_read(&ctxt->loc_refcount) < LI_POISON);
+	LASSERT(atomic_read(&ctxt->loc_refcount) > 1);
+	llog_ctxt_put(ctxt);
+
+	/*
+	 * Try to free the ctxt.
+	 */
+	rc = __llog_ctxt_put(env, ctxt);
+	if (rc)
+		CERROR("Error %d while cleaning up ctxt %p\n",
+		       rc, ctxt);
+
+	l_wait_event(olg->olg_waitq,
+		     llog_group_ctxt_null(olg, idx), &lwi);
+
+	return rc;
+}
+EXPORT_SYMBOL(llog_cleanup);
+
+int llog_setup(const struct lu_env *env, struct obd_device *obd,
+	       struct obd_llog_group *olg, int index,
+	       struct obd_device *disk_obd, struct llog_operations *op)
+{
+	struct llog_ctxt *ctxt;
+	int rc = 0;
+
+	if (index < 0 || index >= LLOG_MAX_CTXTS)
+		return -EINVAL;
+
+	LASSERT(olg != NULL);
+
+	ctxt = llog_new_ctxt(obd);
+	if (!ctxt)
+		return -ENOMEM;
+
+	ctxt->loc_obd = obd;
+	ctxt->loc_olg = olg;
+	ctxt->loc_idx = index;
+	ctxt->loc_logops = op;
+	mutex_init(&ctxt->loc_mutex);
+	ctxt->loc_exp = class_export_get(disk_obd->obd_self_export);
+	ctxt->loc_flags = LLOG_CTXT_FLAG_UNINITIALIZED;
+
+	rc = llog_group_set_ctxt(olg, ctxt, index);
+	if (rc) {
+		llog_ctxt_destroy(ctxt);
+		if (rc == -EEXIST) {
+			ctxt = llog_group_get_ctxt(olg, index);
+			if (ctxt) {
+				/*
+				 * mds_lov_update_desc() might call here multiple
+				 * times. So if the llog is already set up then
+				 * don't to do it again.
+				 */
+				CDEBUG(D_CONFIG, "obd %s ctxt %d already set up\n",
+				       obd->obd_name, index);
+				LASSERT(ctxt->loc_olg == olg);
+				LASSERT(ctxt->loc_obd == obd);
+				LASSERT(ctxt->loc_exp == disk_obd->obd_self_export);
+				LASSERT(ctxt->loc_logops == op);
+				llog_ctxt_put(ctxt);
+			}
+			rc = 0;
+		}
+		return rc;
+	}
+
+	if (op->lop_setup) {
+		if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LLOG_SETUP))
+			rc = -EOPNOTSUPP;
+		else
+			rc = op->lop_setup(env, obd, olg, index, disk_obd);
+	}
+
+	if (rc) {
+		CERROR("%s: ctxt %d lop_setup=%p failed: rc = %d\n",
+		       obd->obd_name, index, op->lop_setup, rc);
+		llog_group_clear_ctxt(olg, index);
+		llog_ctxt_destroy(ctxt);
+	} else {
+		CDEBUG(D_CONFIG, "obd %s ctxt %d is initialized\n",
+		       obd->obd_name, index);
+		ctxt->loc_flags &= ~LLOG_CTXT_FLAG_UNINITIALIZED;
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL(llog_setup);
+
+int llog_sync(struct llog_ctxt *ctxt, struct obd_export *exp, int flags)
+{
+	int rc = 0;
+
+	if (!ctxt)
+		return 0;
+
+	if (CTXTP(ctxt, sync))
+		rc = CTXTP(ctxt, sync)(ctxt, exp, flags);
+
+	return rc;
+}
+EXPORT_SYMBOL(llog_sync);
+
+int llog_cancel(const struct lu_env *env, struct llog_ctxt *ctxt,
+		struct llog_cookie *cookies, int flags)
+{
+	int rc;
+
+	if (!ctxt) {
+		CERROR("No ctxt\n");
+		return -ENODEV;
+	}
+
+	CTXT_CHECK_OP(ctxt, cancel, -EOPNOTSUPP);
+	rc = CTXTP(ctxt, cancel)(env, ctxt, cookies, flags);
+	return rc;
+}
+EXPORT_SYMBOL(llog_cancel);
+
+/* context key constructor/destructor: llog_key_init, llog_key_fini */
+LU_KEY_INIT_FINI(llog, struct llog_thread_info);
+/* context key: llog_thread_key */
+LU_CONTEXT_KEY_DEFINE(llog, LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL);
+LU_KEY_INIT_GENERIC(llog);
+EXPORT_SYMBOL(llog_thread_key);
+
+int llog_info_init(void)
+{
+	llog_key_init_generic(&llog_thread_key, NULL);
+	lu_context_key_register(&llog_thread_key);
+	return 0;
+}
+
+void llog_info_fini(void)
+{
+	lu_context_key_degister(&llog_thread_key);
+}