1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2002 Cluster File Systems, Inc. <info@clusterfs.com>
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #define DEBUG_SUBSYSTEM S_CMOBD
24 #include <linux/version.h>
25 #include <linux/init.h>
26 #include <linux/obd_support.h>
27 #include <linux/lustre_lib.h>
28 #include <linux/lustre_net.h>
29 #include <linux/lustre_idl.h>
30 #include <linux/obd_class.h>
31 #include <linux/lustre_mds.h>
32 #include <linux/lustre_cmobd.h>
33 #include <linux/lprocfs_status.h>
34 #include <linux/obd_lov.h>
35 #include <linux/obd_ost.h>
36 #include <linux/obd_lmv.h>
38 #include "cm_internal.h"
40 static int cmobd_attach(struct obd_device *obd,
41 obd_count len, void *data)
43 struct lprocfs_static_vars lvars;
45 lprocfs_init_vars(cmobd, &lvars);
46 return lprocfs_obd_attach(obd, lvars.obd_vars);
49 static int cmobd_detach(struct obd_device *obd)
51 return lprocfs_obd_detach(obd);
54 static inline int cmobd_md_obd(struct obd_device *obd)
56 if (!strcmp(obd->obd_type->typ_name, OBD_MDC_DEVICENAME) ||
57 !strcmp(obd->obd_type->typ_name, OBD_LMV_DEVICENAME))
63 static inline int cmobd_dt_obd(struct obd_device *obd)
65 if (!strcmp(obd->obd_type->typ_name, OBD_LOV_DEVICENAME) ||
66 !strcmp(obd->obd_type->typ_name, OBD_OSC_DEVICENAME))
72 static int cmobd_init_dt_desc(struct obd_device *obd)
74 struct cm_obd *cmobd = &obd->u.cm;
79 /* as CMOBD is stand alone device, that is has not to be connected, we
80 * have no other way to init EAs correctly but ask master device about
81 * it. Thus both, DT and MD layers should be able to answer with correct
82 * lov_desc. LOV knows it explicitly and LMV/MDC have to ask MDS server
84 valsize = sizeof(cmobd->master_desc);
85 memset(&cmobd->master_desc, 0, sizeof(cmobd->master_desc));
87 rc = obd_get_info(cmobd->master_exp, strlen("lovdesc") + 1,
88 "lovdesc", &valsize, &cmobd->master_desc);
92 static int cmobd_init_ea_size(struct obd_device *obd)
94 int rc = 0, tgt_count, easize, cookiesize;
95 struct cm_obd *cmobd = &obd->u.cm;
98 if (!cmobd->master_exp)
101 tgt_count = cmobd->master_desc.ld_tgt_count;
103 /* no EA setup is needed as there is single OST with no LOV */
107 easize = lov_mds_md_size(tgt_count);
108 cookiesize = tgt_count * sizeof(struct llog_cookie);
109 rc = obd_init_ea_size(cmobd->master_exp, easize, cookiesize);
113 static char *types[] = {
114 OBD_LMV_DEVICENAME, OBD_MDC_DEVICENAME,
115 OBD_LOV_DEVICENAME, OBD_OSC_DEVICENAME
118 static struct obd_device *
119 cmobd_find_obd(struct obd_device *obd, struct obd_uuid *uuid)
121 struct obd_device *res;
125 CWARN("%s: looking for client obd %s\n",
126 obd->obd_uuid.uuid, uuid->uuid);
128 for (i = 0; i < sizeof(types) / sizeof(char *); i++) {
129 res = class_find_client_obd(NULL, types[i], uuid);
136 static int cmobd_setup(struct obd_device *obd, obd_count len, void *buf)
138 struct obd_uuid master_uuid, cache_uuid;
139 struct lustre_handle conn = { 0 };
140 struct cm_obd *cmobd = &obd->u.cm;
141 struct lustre_cfg* lcfg = buf;
142 struct lustre_id mid, lid;
147 if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
148 CERROR("%s: setup requires master device uuid\n",
153 if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
154 CERROR("%s: setup requires cache device uuid\n",
159 obd_str2uuid(&master_uuid, lustre_cfg_string(lcfg, 1));
160 obd_str2uuid(&cache_uuid, lustre_cfg_string(lcfg, 2));
162 /* getting master obd */
163 cmobd->master_obd = cmobd_find_obd(obd, &master_uuid);
164 if (!cmobd->master_obd) {
165 CERROR("can't find master client obd by uuid %s\n",
170 /* getting cache obd */
171 cmobd->cache_obd = class_uuid2obd(&cache_uuid);
172 if (cmobd->cache_obd == NULL) {
173 CERROR("CMOBD: unable to find obd by uuid: %s\n",
178 /* connecting master */
179 memset(&conn, 0, sizeof(conn));
180 rc = obd_connect(&conn, cmobd->master_obd, &obd->obd_uuid,
181 NULL, OBD_OPT_REAL_CLIENT);
184 cmobd->master_exp = class_conn2export(&conn);
186 /* connecting cache */
187 memset(&conn, 0, sizeof(conn));
188 rc = class_connect(&conn, cmobd->cache_obd, &obd->obd_uuid);
190 GOTO(put_master, rc);
191 cmobd->cache_exp = class_conn2export(&conn);
193 /* initialing DT desc. Both, data and metadata layers should be able to
194 * serve this call. */
195 rc = cmobd_init_dt_desc(obd);
196 if (rc != 0 && rc != -EPROTO) {
197 CERROR("cannot get DT layer desc from master device %s, "
198 "err %d.\n", cmobd->master_exp->exp_obd->obd_name,
203 if (cmobd_dt_obd(cmobd->master_exp->exp_obd)) {
204 /* for master dt device remove the recovery flag. */
205 rc = obd_set_info(cmobd->master_exp, strlen("unrecovery"),
206 "unrecovery", 0, NULL);
210 rc = cmobd_init_write_srv(obd);
215 if (cmobd_md_obd(cmobd->master_exp->exp_obd)) {
216 rc = cmobd_init_ea_size(obd);
218 CERROR("can't init MD layer EA size, "
222 cmobd->write_srv = NULL;
224 /* requesting master obd to have its root inode store cookie to
225 * be able to save it to local root inode EA. */
226 valsize = sizeof(struct lustre_id);
228 rc = obd_get_info(cmobd->master_exp, strlen("rootid"),
229 "rootid", &valsize, &mid);
231 CERROR("can't get rootid from master MDS %s, "
232 "err= %d.\n", master_uuid.uuid, rc);
236 /* getting rootid from cache MDS. It is needed to update local
237 * (cache) root inode by rootid value from master obd. */
238 rc = obd_get_info(cmobd->cache_exp, strlen("rootid"),
239 "rootid", &valsize, &lid);
241 CERROR("can't get rootid from local MDS %s, "
242 "err= %d.\n", cache_uuid.uuid, rc);
246 /* storing master MDS rootid to local root inode EA. */
247 CWARN("storing "DLID4" to local inode "DLID4".\n",
248 OLID4(&mid), OLID4(&lid));
250 rc = mds_update_mid(cmobd->cache_exp->exp_obd, &lid,
253 CERROR("can't update local root inode by ID "
254 "from master MDS %s, err = %d.\n",
255 master_uuid.uuid, rc);
262 class_disconnect(cmobd->cache_exp, 0);
264 obd_disconnect(cmobd->master_exp, 0);
268 static int cmobd_cleanup(struct obd_device *obd, int flags)
270 struct cm_obd *cmobd = &obd->u.cm;
274 if (cmobd->write_srv)
275 cmobd_cleanup_write_srv(obd);
277 rc = obd_disconnect(cmobd->master_exp, flags);
279 CERROR("error disconnecting master %s, err %d\n",
280 cmobd->master_exp->exp_obd->obd_name, rc);
283 rc = class_disconnect(cmobd->cache_exp, flags);
285 CERROR("error disconnecting cache %s, err %d\n",
286 cmobd->cache_exp->exp_obd->obd_name, rc);
292 static int cmobd_iocontrol(unsigned int cmd, struct obd_export *exp,
293 int len, void *karg, void *uarg)
295 struct obd_device *obd = exp->exp_obd;
300 case OBD_IOC_CMOBD_SYNC: /* trigger reintegration */
301 rc = cmobd_reintegrate(obd);
304 CERROR("unrecognized ioctl %#x\n", cmd);
312 static struct obd_ops cmobd_ops = {
313 .o_owner = THIS_MODULE,
314 .o_attach = cmobd_attach,
315 .o_detach = cmobd_detach,
316 .o_setup = cmobd_setup,
317 .o_cleanup = cmobd_cleanup,
318 .o_iocontrol = cmobd_iocontrol,
321 kmem_cache_t *cmobd_extent_slab;
323 static int __init cmobd_init(void)
325 struct lprocfs_static_vars lvars;
329 printk(KERN_INFO "Lustre: Cache Manager OBD driver; info@clusterfs.com\n");
331 lprocfs_init_vars(cmobd, &lvars);
332 rc = class_register_type(&cmobd_ops, NULL, lvars.module_vars,
333 OBD_CMOBD_DEVICENAME);
336 cmobd_extent_slab = kmem_cache_create("cmobd_extents",
337 sizeof(struct cmobd_extent_info), 0,
338 SLAB_HWCACHE_ALIGN, NULL, NULL);
339 if (cmobd_extent_slab == NULL) {
340 class_unregister_type(OBD_CMOBD_DEVICENAME);
346 static void __exit cmobd_exit(void)
348 class_unregister_type(OBD_CMOBD_DEVICENAME);
349 if (kmem_cache_destroy(cmobd_extent_slab) != 0)
350 CERROR("couldn't free cmobd extent slab\n");
353 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
354 MODULE_DESCRIPTION("Lustre Cache Manager OBD driver");
355 MODULE_LICENSE("GPL");
357 module_init(cmobd_init);
358 module_exit(cmobd_exit);