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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
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