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