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