--- /dev/null
+/*
+ * 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ */
+/*
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/include/lustre_mdc.h
+ *
+ * MDS data structures.
+ * See also lustre_idl.h for wire formats of requests.
+ */
+
+#ifndef _LUSTRE_MDC_H
+#define _LUSTRE_MDC_H
+
+/** \defgroup mdc mdc
+ *
+ * @{
+ */
+
+#include <linux/fs.h>
+#include <linux/dcache.h>
+#include "lustre_intent.h"
+#include "lustre_handles.h"
+#include "../../include/linux/libcfs/libcfs.h"
+#include "obd_class.h"
+#include "lustre/lustre_idl.h"
+#include "lustre_lib.h"
+#include "lustre_dlm.h"
+#include "lustre_export.h"
+
+struct ptlrpc_client;
+struct obd_export;
+struct ptlrpc_request;
+struct obd_device;
+
+struct mdc_rpc_lock {
+ struct mutex rpcl_mutex;
+ struct lookup_intent *rpcl_it;
+ int rpcl_fakes;
+};
+
+#define MDC_FAKE_RPCL_IT ((void *)0x2c0012bfUL)
+
+static inline void mdc_init_rpc_lock(struct mdc_rpc_lock *lck)
+{
+ mutex_init(&lck->rpcl_mutex);
+ lck->rpcl_it = NULL;
+}
+
+static inline void mdc_get_rpc_lock(struct mdc_rpc_lock *lck,
+ struct lookup_intent *it)
+{
+ if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
+ it->it_op == IT_LAYOUT))
+ return;
+
+ /* This would normally block until the existing request finishes.
+ * If fail_loc is set it will block until the regular request is
+ * done, then set rpcl_it to MDC_FAKE_RPCL_IT. Once that is set
+ * it will only be cleared when all fake requests are finished.
+ * Only when all fake requests are finished can normal requests
+ * be sent, to ensure they are recoverable again. */
+ again:
+ mutex_lock(&lck->rpcl_mutex);
+
+ if (CFS_FAIL_CHECK_QUIET(OBD_FAIL_MDC_RPCS_SEM)) {
+ lck->rpcl_it = MDC_FAKE_RPCL_IT;
+ lck->rpcl_fakes++;
+ mutex_unlock(&lck->rpcl_mutex);
+ return;
+ }
+
+ /* This will only happen when the CFS_FAIL_CHECK() was
+ * just turned off but there are still requests in progress.
+ * Wait until they finish. It doesn't need to be efficient
+ * in this extremely rare case, just have low overhead in
+ * the common case when it isn't true. */
+ while (unlikely(lck->rpcl_it == MDC_FAKE_RPCL_IT)) {
+ mutex_unlock(&lck->rpcl_mutex);
+ schedule_timeout(cfs_time_seconds(1) / 4);
+ goto again;
+ }
+
+ LASSERT(lck->rpcl_it == NULL);
+ lck->rpcl_it = it;
+}
+
+static inline void mdc_put_rpc_lock(struct mdc_rpc_lock *lck,
+ struct lookup_intent *it)
+{
+ if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
+ it->it_op == IT_LAYOUT))
+ return;
+
+ if (lck->rpcl_it == MDC_FAKE_RPCL_IT) { /* OBD_FAIL_MDC_RPCS_SEM */
+ mutex_lock(&lck->rpcl_mutex);
+
+ LASSERTF(lck->rpcl_fakes > 0, "%d\n", lck->rpcl_fakes);
+ lck->rpcl_fakes--;
+
+ if (lck->rpcl_fakes == 0)
+ lck->rpcl_it = NULL;
+
+ } else {
+ LASSERTF(it == lck->rpcl_it, "%p != %p\n", it, lck->rpcl_it);
+ lck->rpcl_it = NULL;
+ }
+
+ mutex_unlock(&lck->rpcl_mutex);
+}
+
+/* Update the maximum observed easize and cookiesize. The default easize
+ * and cookiesize is initialized to the minimum value but allowed to grow
+ * up to a single page in size if required to handle the common case.
+ */
+static inline void mdc_update_max_ea_from_body(struct obd_export *exp,
+ struct mdt_body *body)
+{
+ if (body->valid & OBD_MD_FLMODEASIZE) {
+ struct client_obd *cli = &exp->exp_obd->u.cli;
+
+ if (cli->cl_max_mds_easize < body->max_mdsize) {
+ cli->cl_max_mds_easize = body->max_mdsize;
+ cli->cl_default_mds_easize =
+ min_t(__u32, body->max_mdsize, PAGE_CACHE_SIZE);
+ }
+ if (cli->cl_max_mds_cookiesize < body->max_cookiesize) {
+ cli->cl_max_mds_cookiesize = body->max_cookiesize;
+ cli->cl_default_mds_cookiesize =
+ min_t(__u32, body->max_cookiesize, PAGE_CACHE_SIZE);
+ }
+ }
+}
+
+
+struct mdc_cache_waiter {
+ struct list_head mcw_entry;
+ wait_queue_head_t mcw_waitq;
+};
+
+/* mdc/mdc_locks.c */
+int it_disposition(struct lookup_intent *it, int flag);
+void it_clear_disposition(struct lookup_intent *it, int flag);
+void it_set_disposition(struct lookup_intent *it, int flag);
+int it_open_error(int phase, struct lookup_intent *it);
+
+static inline bool cl_is_lov_delay_create(unsigned int flags)
+{
+ return (flags & O_LOV_DELAY_CREATE) == O_LOV_DELAY_CREATE;
+}
+
+static inline void cl_lov_delay_create_clear(unsigned int *flags)
+{
+ if ((*flags & O_LOV_DELAY_CREATE) == O_LOV_DELAY_CREATE)
+ *flags &= ~O_LOV_DELAY_CREATE;
+}
+
+/** @} mdc */
+
+#endif
Code Review / kvmfornfv.git / blobdiff