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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