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
59 struct 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 */
lustre_build_lock_params(int cmd,unsigned long open_flags,__u64 connect_flags,loff_t pos,ssize_t len,struct lustre_rw_params * params)71 static 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 */
110 struct 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 */
125 struct ll_dir_chain {
126 /* XXX something. Later */
127 };
128
ll_dir_chain_init(struct ll_dir_chain * chain)129 static inline void ll_dir_chain_init(struct ll_dir_chain *chain)
130 {
131 }
132
ll_dir_chain_fini(struct ll_dir_chain * chain)133 static inline void ll_dir_chain_fini(struct ll_dir_chain *chain)
134 {
135 }
136
hash_x_index(__u64 hash,int hash64)137 static 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