Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / lustre / lustre / include / lustre_lite.h

diff --git a/kernel/drivers/staging/lustre/lustre/include/lustre_lite.h b/kernel/drivers/staging/lustre/lustre/include/lustre_lite.h
new file mode 100644 (file)
index 0000000..df557c2
--- /dev/null
+++ b/kernel/drivers/staging/lustre/lustre/include/lustre_lite.h
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+/*
+ * 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.
+ */
+
+#ifndef _LL_H
+#define _LL_H
+
+/** \defgroup lite lite
+ *
+ * @{
+ */
+
+#include "linux/lustre_lite.h"
+
+#include "obd_class.h"
+#include "lustre_net.h"
+#include "lustre_mds.h"
+#include "lustre_ha.h"
+
+/* 4UL * 1024 * 1024 */
+#define LL_MAX_BLKSIZE_BITS     (22)
+#define LL_MAX_BLKSIZE   (1UL<<LL_MAX_BLKSIZE_BITS)
+
+#include "lustre/lustre_user.h"
+
+
+struct lustre_rw_params {
+       int             lrp_lock_mode;
+       ldlm_policy_data_t lrp_policy;
+       u32             lrp_brw_flags;
+       int             lrp_ast_flags;
+};
+
+/*
+ * XXX nikita: this function lives in the header because it is used by both
+ * llite kernel module and liblustre library, and there is no (?) better place
+ * to put it in.
+ */
+static inline void lustre_build_lock_params(int cmd, unsigned long open_flags,
+                                           __u64 connect_flags,
+                                           loff_t pos, ssize_t len,
+                                           struct lustre_rw_params *params)
+{
+       params->lrp_lock_mode = (cmd == OBD_BRW_READ) ? LCK_PR : LCK_PW;
+       params->lrp_brw_flags = 0;
+
+       params->lrp_policy.l_extent.start = pos;
+       params->lrp_policy.l_extent.end = pos + len - 1;
+       /*
+        * for now O_APPEND always takes local locks.
+        */
+       if (cmd == OBD_BRW_WRITE && (open_flags & O_APPEND)) {
+               params->lrp_policy.l_extent.start = 0;
+               params->lrp_policy.l_extent.end   = OBD_OBJECT_EOF;
+       } else if (LIBLUSTRE_CLIENT && (connect_flags & OBD_CONNECT_SRVLOCK)) {
+               /*
+                * liblustre: OST-side locking for all non-O_APPEND
+                * reads/writes.
+                */
+               params->lrp_lock_mode = LCK_NL;
+               params->lrp_brw_flags = OBD_BRW_SRVLOCK;
+       } else {
+               /*
+                * nothing special for the kernel. In the future llite may use
+                * OST-side locks for small writes into highly contended
+                * files.
+                */
+       }
+       params->lrp_ast_flags = (open_flags & O_NONBLOCK) ?
+               LDLM_FL_BLOCK_NOWAIT : 0;
+}
+
+/*
+ * This is embedded into liblustre and llite super-blocks to keep track of
+ * connect flags (capabilities) supported by all imports given mount is
+ * connected to.
+ */
+struct lustre_client_ocd {
+       /*
+        * This is conjunction of connect_flags across all imports (LOVs) this
+        * mount is connected to. This field is updated by cl_ocd_update()
+        * under ->lco_lock.
+        */
+       __u64         lco_flags;
+       struct mutex       lco_lock;
+       struct obd_export *lco_md_exp;
+       struct obd_export *lco_dt_exp;
+};
+
+/*
+ * Chain of hash overflow pages.
+ */
+struct ll_dir_chain {
+       /* XXX something. Later */
+};
+
+static inline void ll_dir_chain_init(struct ll_dir_chain *chain)
+{
+}
+
+static inline void ll_dir_chain_fini(struct ll_dir_chain *chain)
+{
+}
+
+static inline unsigned long hash_x_index(__u64 hash, int hash64)
+{
+       if (BITS_PER_LONG == 32 && hash64)
+               hash >>= 32;
+       /* save hash 0 as index 0 because otherwise we'll save it at
+        * page index end (~0UL) and it causes truncate_inode_pages_range()
+        * to loop forever.
+        */
+       return ~0UL - (hash + !hash);
+}
+
+/** @} lite */
+
+#endif