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 #define LLAP_FROM_COOKIE(c) \
64 (LASSERT(((struct ll_async_page *)(c))->llap_magic == LLAP_MAGIC), \
65 (struct ll_async_page *)(c))
67 /* 4UL * 1024 * 1024 */
68 #define LL_MAX_BLKSIZE_BITS (22)
69 #define LL_MAX_BLKSIZE (1UL<<LL_MAX_BLKSIZE_BITS)
71 #include <lustre/lustre_user.h>
74 struct lustre_rw_params {
76 ldlm_policy_data_t lrp_policy;
77 obd_flag lrp_brw_flags;
82 * XXX nikita: this function lives in the header because it is used by both
83 * llite kernel module and liblustre library, and there is no (?) better place
86 static inline void lustre_build_lock_params(int cmd, unsigned long open_flags,
88 loff_t pos, ssize_t len,
89 struct lustre_rw_params *params)
91 params->lrp_lock_mode = (cmd == OBD_BRW_READ) ? LCK_PR : LCK_PW;
92 params->lrp_brw_flags = 0;
94 params->lrp_policy.l_extent.start = pos;
95 params->lrp_policy.l_extent.end = pos + len - 1;
97 * for now O_APPEND always takes local locks.
99 if (cmd == OBD_BRW_WRITE && (open_flags & O_APPEND)) {
100 params->lrp_policy.l_extent.start = 0;
101 params->lrp_policy.l_extent.end = OBD_OBJECT_EOF;
102 } else if (LIBLUSTRE_CLIENT && (connect_flags & OBD_CONNECT_SRVLOCK)) {
104 * liblustre: OST-side locking for all non-O_APPEND
107 params->lrp_lock_mode = LCK_NL;
108 params->lrp_brw_flags = OBD_BRW_SRVLOCK;
111 * nothing special for the kernel. In the future llite may use
112 * OST-side locks for small writes into highly contended
116 params->lrp_ast_flags = (open_flags & O_NONBLOCK) ?
117 LDLM_FL_BLOCK_NOWAIT : 0;
121 * This is embedded into liblustre and llite super-blocks to keep track of
122 * connect flags (capabilities) supported by all imports given mount is
125 struct lustre_client_ocd {
127 * This is conjunction of connect_flags across all imports (LOVs) this
128 * mount is connected to. This field is updated by ll_ocd_update()
136 * This function is used as an upcall-callback hooked by liblustre and llite
137 * clients into obd_notify() listeners chain to handle notifications about
138 * change of import connect_flags. See llu_fsswop_mount() and
139 * lustre_common_fill_super().
141 * Again, it is dumped into this header for the lack of a better place.
143 static inline int ll_ocd_update(struct obd_device *host,
144 struct obd_device *watched,
145 enum obd_notify_event ev, void *owner)
147 struct lustre_client_ocd *lco;
148 struct client_obd *cli;
153 if (!strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
154 cli = &watched->u.cli;
156 flags = cli->cl_import->imp_connect_data.ocd_connect_flags;
157 CDEBUG(D_SUPER, "Changing connect_flags: "LPX64" -> "LPX64"\n",
158 lco->lco_flags, flags);
159 spin_lock(&lco->lco_lock);
160 lco->lco_flags &= flags;
161 spin_unlock(&lco->lco_lock);
164 CERROR("unexpected notification from %s %s!\n",
165 watched->obd_type->typ_name,
173 * Chain of hash overflow pages.
175 struct ll_dir_chain {
176 /* XXX something. Later */
179 static inline void ll_dir_chain_init(struct ll_dir_chain *chain)
183 static inline void ll_dir_chain_fini(struct ll_dir_chain *chain)
187 static inline __u32 hash_x_index(__u32 value)
189 return ((__u32)~0) - value;