1/* 2 * GPL HEADER START 3 * 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 only, 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License version 2 for more details (a copy is included 14 * in the LICENSE file that accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License 17 * version 2 along with this program; If not, see 18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf 19 * 20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 21 * CA 95054 USA or visit www.sun.com if you need additional information or 22 * have any questions. 23 * 24 * GPL HEADER END 25 */ 26/* 27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. 28 * Use is subject to license terms. 29 * 30 * Copyright (c) 2011, 2012, Intel Corporation. 31 */ 32/* 33 * This file is part of Lustre, http://www.lustre.org/ 34 * Lustre is a trademark of Sun Microsystems, Inc. 35 */ 36 37#ifndef _LL_H 38#define _LL_H 39 40/** \defgroup lite lite 41 * 42 * @{ 43 */ 44 45#include "linux/lustre_lite.h" 46 47#include "obd_class.h" 48#include "lustre_net.h" 49#include "lustre_mds.h" 50#include "lustre_ha.h" 51 52/* 4UL * 1024 * 1024 */ 53#define LL_MAX_BLKSIZE_BITS (22) 54#define LL_MAX_BLKSIZE (1UL<<LL_MAX_BLKSIZE_BITS) 55 56#include "lustre/lustre_user.h" 57 58 59struct lustre_rw_params { 60 int lrp_lock_mode; 61 ldlm_policy_data_t lrp_policy; 62 u32 lrp_brw_flags; 63 int lrp_ast_flags; 64}; 65 66/* 67 * XXX nikita: this function lives in the header because it is used by both 68 * llite kernel module and liblustre library, and there is no (?) better place 69 * to put it in. 70 */ 71static inline void lustre_build_lock_params(int cmd, unsigned long open_flags, 72 __u64 connect_flags, 73 loff_t pos, ssize_t len, 74 struct lustre_rw_params *params) 75{ 76 params->lrp_lock_mode = (cmd == OBD_BRW_READ) ? LCK_PR : LCK_PW; 77 params->lrp_brw_flags = 0; 78 79 params->lrp_policy.l_extent.start = pos; 80 params->lrp_policy.l_extent.end = pos + len - 1; 81 /* 82 * for now O_APPEND always takes local locks. 83 */ 84 if (cmd == OBD_BRW_WRITE && (open_flags & O_APPEND)) { 85 params->lrp_policy.l_extent.start = 0; 86 params->lrp_policy.l_extent.end = OBD_OBJECT_EOF; 87 } else if (LIBLUSTRE_CLIENT && (connect_flags & OBD_CONNECT_SRVLOCK)) { 88 /* 89 * liblustre: OST-side locking for all non-O_APPEND 90 * reads/writes. 91 */ 92 params->lrp_lock_mode = LCK_NL; 93 params->lrp_brw_flags = OBD_BRW_SRVLOCK; 94 } else { 95 /* 96 * nothing special for the kernel. In the future llite may use 97 * OST-side locks for small writes into highly contended 98 * files. 99 */ 100 } 101 params->lrp_ast_flags = (open_flags & O_NONBLOCK) ? 102 LDLM_FL_BLOCK_NOWAIT : 0; 103} 104 105/* 106 * This is embedded into liblustre and llite super-blocks to keep track of 107 * connect flags (capabilities) supported by all imports given mount is 108 * connected to. 109 */ 110struct lustre_client_ocd { 111 /* 112 * This is conjunction of connect_flags across all imports (LOVs) this 113 * mount is connected to. This field is updated by cl_ocd_update() 114 * under ->lco_lock. 115 */ 116 __u64 lco_flags; 117 struct mutex lco_lock; 118 struct obd_export *lco_md_exp; 119 struct obd_export *lco_dt_exp; 120}; 121 122/* 123 * Chain of hash overflow pages. 124 */ 125struct ll_dir_chain { 126 /* XXX something. Later */ 127}; 128 129static inline void ll_dir_chain_init(struct ll_dir_chain *chain) 130{ 131} 132 133static inline void ll_dir_chain_fini(struct ll_dir_chain *chain) 134{ 135} 136 137static inline unsigned long hash_x_index(__u64 hash, int hash64) 138{ 139 if (BITS_PER_LONG == 32 && hash64) 140 hash >>= 32; 141 /* save hash 0 as index 0 because otherwise we'll save it at 142 * page index end (~0UL) and it causes truncate_inode_pages_range() 143 * to loop forever. 144 */ 145 return ~0UL - (hash + !hash); 146} 147 148/** @} lite */ 149 150#endif 151