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) 2008, 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 * cl code shared between vvp and liblustre (and other Lustre clients in the
37 * future).
38 *
39 */
40 #include "../include/obd_class.h"
41 #include "../include/obd_support.h"
42 #include "../include/obd.h"
43 #include "../include/cl_object.h"
44 #include "../include/lclient.h"
45
46 #include "../include/lustre_lite.h"
47
48
49 /* Initialize the default and maximum LOV EA and cookie sizes. This allows
50 * us to make MDS RPCs with large enough reply buffers to hold the
51 * maximum-sized (= maximum striped) EA and cookie without having to
52 * calculate this (via a call into the LOV + OSCs) each time we make an RPC. */
cl_init_ea_size(struct obd_export * md_exp,struct obd_export * dt_exp)53 int cl_init_ea_size(struct obd_export *md_exp, struct obd_export *dt_exp)
54 {
55 struct lov_stripe_md lsm = { .lsm_magic = LOV_MAGIC_V3 };
56 __u32 valsize = sizeof(struct lov_desc);
57 int rc, easize, def_easize, cookiesize;
58 struct lov_desc desc;
59 __u16 stripes, def_stripes;
60
61 rc = obd_get_info(NULL, dt_exp, sizeof(KEY_LOVDESC), KEY_LOVDESC,
62 &valsize, &desc, NULL);
63 if (rc)
64 return rc;
65
66 stripes = min_t(__u32, desc.ld_tgt_count, LOV_MAX_STRIPE_COUNT);
67 lsm.lsm_stripe_count = stripes;
68 easize = obd_size_diskmd(dt_exp, &lsm);
69
70 def_stripes = min_t(__u32, desc.ld_default_stripe_count,
71 LOV_MAX_STRIPE_COUNT);
72 lsm.lsm_stripe_count = def_stripes;
73 def_easize = obd_size_diskmd(dt_exp, &lsm);
74
75 cookiesize = stripes * sizeof(struct llog_cookie);
76
77 /* default cookiesize is 0 because from 2.4 server doesn't send
78 * llog cookies to client. */
79 CDEBUG(D_HA,
80 "updating def/max_easize: %d/%d def/max_cookiesize: 0/%d\n",
81 def_easize, easize, cookiesize);
82
83 rc = md_init_ea_size(md_exp, easize, def_easize, cookiesize, 0);
84 return rc;
85 }
86
87 /**
88 * This function is used as an upcall-callback hooked by liblustre and llite
89 * clients into obd_notify() listeners chain to handle notifications about
90 * change of import connect_flags. See llu_fsswop_mount() and
91 * lustre_common_fill_super().
92 */
cl_ocd_update(struct obd_device * host,struct obd_device * watched,enum obd_notify_event ev,void * owner,void * data)93 int cl_ocd_update(struct obd_device *host,
94 struct obd_device *watched,
95 enum obd_notify_event ev, void *owner, void *data)
96 {
97 struct lustre_client_ocd *lco;
98 struct client_obd *cli;
99 __u64 flags;
100 int result;
101
102 if (!strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
103 cli = &watched->u.cli;
104 lco = owner;
105 flags = cli->cl_import->imp_connect_data.ocd_connect_flags;
106 CDEBUG(D_SUPER, "Changing connect_flags: %#llx -> %#llx\n",
107 lco->lco_flags, flags);
108 mutex_lock(&lco->lco_lock);
109 lco->lco_flags &= flags;
110 /* for each osc event update ea size */
111 if (lco->lco_dt_exp)
112 cl_init_ea_size(lco->lco_md_exp, lco->lco_dt_exp);
113
114 mutex_unlock(&lco->lco_lock);
115 result = 0;
116 } else {
117 CERROR("unexpected notification from %s %s!\n",
118 watched->obd_type->typ_name,
119 watched->obd_name);
120 result = -EINVAL;
121 }
122 return result;
123 }
124
125 #define GROUPLOCK_SCOPE "grouplock"
126
cl_get_grouplock(struct cl_object * obj,unsigned long gid,int nonblock,struct ccc_grouplock * cg)127 int cl_get_grouplock(struct cl_object *obj, unsigned long gid, int nonblock,
128 struct ccc_grouplock *cg)
129 {
130 struct lu_env *env;
131 struct cl_io *io;
132 struct cl_lock *lock;
133 struct cl_lock_descr *descr;
134 __u32 enqflags;
135 int refcheck;
136 int rc;
137
138 env = cl_env_get(&refcheck);
139 if (IS_ERR(env))
140 return PTR_ERR(env);
141
142 io = ccc_env_thread_io(env);
143 io->ci_obj = obj;
144 io->ci_ignore_layout = 1;
145
146 rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
147 if (rc) {
148 /* Does not make sense to take GL for released layout */
149 if (rc > 0)
150 rc = -ENOTSUPP;
151 cl_env_put(env, &refcheck);
152 return rc;
153 }
154
155 descr = &ccc_env_info(env)->cti_descr;
156 descr->cld_obj = obj;
157 descr->cld_start = 0;
158 descr->cld_end = CL_PAGE_EOF;
159 descr->cld_gid = gid;
160 descr->cld_mode = CLM_GROUP;
161
162 enqflags = CEF_MUST | (nonblock ? CEF_NONBLOCK : 0);
163 descr->cld_enq_flags = enqflags;
164
165 lock = cl_lock_request(env, io, descr, GROUPLOCK_SCOPE, current);
166 if (IS_ERR(lock)) {
167 cl_io_fini(env, io);
168 cl_env_put(env, &refcheck);
169 return PTR_ERR(lock);
170 }
171
172 cg->cg_env = cl_env_get(&refcheck);
173 cg->cg_io = io;
174 cg->cg_lock = lock;
175 cg->cg_gid = gid;
176 LASSERT(cg->cg_env == env);
177
178 cl_env_unplant(env, &refcheck);
179 return 0;
180 }
181
cl_put_grouplock(struct ccc_grouplock * cg)182 void cl_put_grouplock(struct ccc_grouplock *cg)
183 {
184 struct lu_env *env = cg->cg_env;
185 struct cl_io *io = cg->cg_io;
186 struct cl_lock *lock = cg->cg_lock;
187 int refcheck;
188
189 LASSERT(cg->cg_env);
190 LASSERT(cg->cg_gid);
191
192 cl_env_implant(env, &refcheck);
193 cl_env_put(env, &refcheck);
194
195 cl_unuse(env, lock);
196 cl_lock_release(env, lock, GROUPLOCK_SCOPE, current);
197 cl_io_fini(env, io);
198 cl_env_put(env, NULL);
199 }
200