1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
40 #if defined(__linux__)
41 #include <linux/lustre_lite.h>
42 #elif defined(__APPLE__)
43 #include <darwin/lustre_lite.h>
44 #elif defined(__WINNT__)
45 #include <winnt/lustre_lite.h>
47 #error Unsupported operating system.
50 #include <obd_class.h>
52 #include <lustre_net.h>
53 #include <lustre_mds.h>
54 #include <lustre_ha.h>
58 /* careful, this is easy to screw up */
59 #define PAGE_CACHE_MAXBYTES ((__u64)(~0UL) << CFS_PAGE_SHIFT)
63 /* 4UL * 1024 * 1024 */
64 #define LL_MAX_BLKSIZE_BITS (22)
65 #define LL_MAX_BLKSIZE (1UL<<LL_MAX_BLKSIZE_BITS)
67 #include <lustre/lustre_user.h>
70 struct lustre_rw_params {
72 ldlm_policy_data_t lrp_policy;
73 obd_flag lrp_brw_flags;
78 * XXX nikita: this function lives in the header because it is used by both
79 * llite kernel module and liblustre library, and there is no (?) better place
82 static inline void lustre_build_lock_params(int cmd, unsigned long open_flags,
84 loff_t pos, ssize_t len,
85 struct lustre_rw_params *params)
87 params->lrp_lock_mode = (cmd == OBD_BRW_READ) ? LCK_PR : LCK_PW;
88 params->lrp_brw_flags = 0;
90 params->lrp_policy.l_extent.start = pos;
91 params->lrp_policy.l_extent.end = pos + len - 1;
93 * for now O_APPEND always takes local locks.
95 if (cmd == OBD_BRW_WRITE && (open_flags & O_APPEND)) {
96 params->lrp_policy.l_extent.start = 0;
97 params->lrp_policy.l_extent.end = OBD_OBJECT_EOF;
98 } else if (LIBLUSTRE_CLIENT && (connect_flags & OBD_CONNECT_SRVLOCK)) {
100 * liblustre: OST-side locking for all non-O_APPEND
103 params->lrp_lock_mode = LCK_NL;
104 params->lrp_brw_flags = OBD_BRW_SRVLOCK;
107 * nothing special for the kernel. In the future llite may use
108 * OST-side locks for small writes into highly contended
112 params->lrp_ast_flags = (open_flags & O_NONBLOCK) ?
113 LDLM_FL_BLOCK_NOWAIT : 0;
117 * This is embedded into liblustre and llite super-blocks to keep track of
118 * connect flags (capabilities) supported by all imports given mount is
121 struct lustre_client_ocd {
123 * This is conjunction of connect_flags across all imports (LOVs) this
124 * mount is connected to. This field is updated by ll_ocd_update()
132 * This function is used as an upcall-callback hooked by liblustre and llite
133 * clients into obd_notify() listeners chain to handle notifications about
134 * change of import connect_flags. See llu_fsswop_mount() and
135 * lustre_common_fill_super().
137 * Again, it is dumped into this header for the lack of a better place.
139 static inline int ll_ocd_update(struct obd_device *host,
140 struct obd_device *watched,
141 enum obd_notify_event ev, void *owner)
143 struct lustre_client_ocd *lco;
144 struct client_obd *cli;
149 if (!strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
150 cli = &watched->u.cli;
152 flags = cli->cl_import->imp_connect_data.ocd_connect_flags;
153 CDEBUG(D_SUPER, "Changing connect_flags: "LPX64" -> "LPX64"\n",
154 lco->lco_flags, flags);
155 spin_lock(&lco->lco_lock);
156 lco->lco_flags &= flags;
157 spin_unlock(&lco->lco_lock);
160 CERROR("unexpected notification from %s %s!\n",
161 watched->obd_type->typ_name,
169 * Chain of hash overflow pages.
171 struct ll_dir_chain {
172 /* XXX something. Later */
175 static inline void ll_dir_chain_init(struct ll_dir_chain *chain)
179 static inline void ll_dir_chain_fini(struct ll_dir_chain *chain)
183 static inline __u32 hash_x_index(__u32 value)
185 return ((__u32)~0) - value;