lustre/fld/fld_handler.c

   1 /* -*- MODE: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  lustre/fld/fld_handler.c
   5  *  FLD (Fids Location Database)
   6  *
   7  *  Copyright (C) 2006 Cluster File Systems, Inc.
   8  *   Author: WangDi <wangdi@clusterfs.com>
   9  *           Yury Umanets <umka@clusterfs.com>
  10  *
  11  *   This file is part of the Lustre file system, http://www.lustre.org
  12  *   Lustre is a trademark of Cluster File Systems, Inc.
  13  *
  14  *   You may have signed or agreed to another license before downloading
  15  *   this software.  If so, you are bound by the terms and conditions
  16  *   of that agreement, and the following does not apply to you.  See the
  17  *   LICENSE file included with this distribution for more information.
  18  *
  19  *   If you did not agree to a different license, then this copy of Lustre
  20  *   is open source software; you can redistribute it and/or modify it
  21  *   under the terms of version 2 of the GNU General Public License as
  22  *   published by the Free Software Foundation.
  23  *
  24  *   In either case, Lustre is distributed in the hope that it will be
  25  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  26  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *   license text for more details.
  28  */
  29 #ifndef EXPORT_SYMTAB
  30 # define EXPORT_SYMTAB
  31 #endif
  32 #define DEBUG_SUBSYSTEM S_FLD
  33
  34 #ifdef __KERNEL__
  35 # include <libcfs/libcfs.h>
  36 # include <linux/module.h>
  37 # include <linux/jbd.h>
  38 # include <asm/div64.h>
  39 #else /* __KERNEL__ */
  40 # include <liblustre.h>
  41 # include <libcfs/list.h>
  42 #endif
  43
  44 #include <obd.h>
  45 #include <obd_class.h>
  46 #include <lustre_ver.h>
  47 #include <obd_support.h>
  48 #include <lprocfs_status.h>
  49
  50 #include <dt_object.h>
  51 #include <md_object.h>
  52 #include <lustre_req_layout.h>
  53 #include <lustre_fld.h>
  54 #include "fld_internal.h"
  55
  56 #ifdef __KERNEL__
  57 static int __init fld_mod_init(void)
  58 {
  59         /* nothing to init seems */
  60         return 0;
  61 }
  62
  63 static void __exit fld_mod_exit(void)
  64 {
  65         /* nothing to fini seems */
  66         return;
  67 }
  68
  69 /* insert index entry and update cache */
  70 int fld_server_create(struct lu_server_fld *fld,
  71                       const struct lu_context *ctx,
  72                       seqno_t seq, mdsno_t mds)
  73 {
  74         ENTRY;
  75         RETURN(fld_index_create(fld, ctx, seq, mds));
  76 }
  77 EXPORT_SYMBOL(fld_server_create);
  78
  79 /* delete index entry */
  80 int fld_server_delete(struct lu_server_fld *fld,
  81                       const struct lu_context *ctx,
  82                       seqno_t seq)
  83 {
  84         ENTRY;
  85         RETURN(fld_index_delete(fld, ctx, seq));
  86 }
  87 EXPORT_SYMBOL(fld_server_delete);
  88
  89 /* issue on-disk index lookup */
  90 int fld_server_lookup(struct lu_server_fld *fld,
  91                       const struct lu_context *ctx,
  92                       seqno_t seq, mdsno_t *mds)
  93 {
  94         ENTRY;
  95         RETURN(fld_index_lookup(fld, ctx, seq, mds));
  96 }
  97 EXPORT_SYMBOL(fld_server_lookup);
  98
  99 static int fld_server_handle(struct lu_server_fld *fld,
 100                              const struct lu_context *ctx,
 101                              __u32 opc, struct md_fld *mf)
 102 {
 103         int rc;
 104         ENTRY;
 105
 106         switch (opc) {
 107         case FLD_CREATE:
 108                 rc = fld_server_create(fld, ctx,
 109                                        mf->mf_seq, mf->mf_mds);
 110                 break;
 111         case FLD_DELETE:
 112                 rc = fld_server_delete(fld, ctx, mf->mf_seq);
 113                 break;
 114         case FLD_LOOKUP:
 115                 rc = fld_server_lookup(fld, ctx,
 116                                        mf->mf_seq, &mf->mf_mds);
 117                 break;
 118         default:
 119                 rc = -EINVAL;
 120                 break;
 121         }
 122         RETURN(rc);
 123
 124 }
 125
 126 static int fld_req_handle0(const struct lu_context *ctx,
 127                            struct lu_server_fld *fld,
 128                            struct ptlrpc_request *req)
 129 {
 130         int rep_buf_size[3] = { -1, -1 };
 131         struct req_capsule pill;
 132         struct md_fld *in;
 133         struct md_fld *out;
 134         int rc = -EPROTO;
 135         __u32 *opc;
 136         ENTRY;
 137
 138         req_capsule_init(&pill, req, RCL_SERVER, rep_buf_size);
 139
 140         req_capsule_set(&pill, &RQF_FLD_QUERY);
 141         req_capsule_pack(&pill);
 142
 143         opc = req_capsule_client_get(&pill, &RMF_FLD_OPC);
 144         if (opc != NULL) {
 145                 in = req_capsule_client_get(&pill, &RMF_FLD_MDFLD);
 146                 if (in == NULL) {
 147                         CERROR("cannot unpack fld request\n");
 148                         GOTO(out_pill, rc = -EPROTO);
 149                 }
 150                 out = req_capsule_server_get(&pill, &RMF_FLD_MDFLD);
 151                 if (out == NULL) {
 152                         CERROR("cannot allocate fld response\n");
 153                         GOTO(out_pill, rc = -EPROTO);
 154                 }
 155                 *out = *in;
 156                 rc = fld_server_handle(fld, ctx, *opc, out);
 157         } else {
 158                 CERROR("cannot unpack FLD operation\n");
 159         }
 160
 161 out_pill:
 162         EXIT;
 163         req_capsule_fini(&pill);
 164         return rc;
 165 }
 166
 167 static int fld_req_handle(struct ptlrpc_request *req)
 168 {
 169         int fail = OBD_FAIL_FLD_ALL_REPLY_NET;
 170         const struct lu_context *ctx;
 171         struct lu_site *site;
 172         int rc = -EPROTO;
 173         ENTRY;
 174
 175         OBD_FAIL_RETURN(OBD_FAIL_FLD_ALL_REPLY_NET | OBD_FAIL_ONCE, 0);
 176
 177         ctx = req->rq_svc_thread->t_ctx;
 178         LASSERT(ctx != NULL);
 179         LASSERT(ctx->lc_thread == req->rq_svc_thread);
 180         if (req->rq_reqmsg->opc == FLD_QUERY) {
 181                 if (req->rq_export != NULL) {
 182                         site = req->rq_export->exp_obd->obd_lu_dev->ld_site;
 183                         LASSERT(site != NULL);
 184                         rc = fld_req_handle0(ctx, site->ls_server_fld, req);
 185                 } else {
 186                         CERROR("Unconnected request\n");
 187                         req->rq_status = -ENOTCONN;
 188                         GOTO(out, rc = -ENOTCONN);
 189                 }
 190         } else {
 191                 CERROR("Wrong opcode: %d\n", req->rq_reqmsg->opc);
 192                 req->rq_status = -ENOTSUPP;
 193                 rc = ptlrpc_error(req);
 194                 RETURN(rc);
 195         }
 196
 197         EXIT;
 198 out:
 199         target_send_reply(req, rc, fail);
 200         return 0;
 201 }
 202
 203 /*
 204  * Returns true, if fid is local to this server node.
 205  *
 206  * WARNING: this function is *not* guaranteed to return false if fid is
 207  * remote: it makes an educated conservative guess only.
 208  *
 209  * fid_is_local() is supposed to be used in assertion checks only.
 210  */
 211 int fid_is_local(struct lu_site *site, const struct lu_fid *fid)
 212 {
 213         int result;
 214
 215         result = 1; /* conservatively assume fid is local */
 216         if (site->ls_client_fld != NULL) {
 217                 mdsno_t mds;
 218                 int rc;
 219
 220                 rc = fld_cache_lookup(site->ls_client_fld->fld_cache,
 221                                       fid_seq(fid), &mds);
 222                 if (rc == 0)
 223                         result = (mds == site->ls_node_id);
 224         }
 225         return result;
 226 }
 227 EXPORT_SYMBOL(fid_is_local);
 228
 229 #ifdef LPROCFS
 230 static int fld_server_proc_init(struct lu_server_fld *fld)
 231 {
 232         int rc;
 233         ENTRY;
 234
 235         fld->fld_proc_dir = lprocfs_register(fld->fld_name,
 236                                              proc_lustre_root,
 237                                              NULL, NULL);
 238         if (IS_ERR(fld->fld_proc_dir)) {
 239                 CERROR("LProcFS failed in fld-init\n");
 240                 rc = PTR_ERR(fld->fld_proc_dir);
 241                 GOTO(err, rc);
 242         }
 243
 244         fld->fld_proc_entry = lprocfs_register("services",
 245                                                fld->fld_proc_dir,
 246                                                NULL, NULL);
 247         if (IS_ERR(fld->fld_proc_entry)) {
 248                 CERROR("LProcFS failed in fld-init\n");
 249                 rc = PTR_ERR(fld->fld_proc_entry);
 250                 GOTO(err_type, rc);
 251         }
 252
 253         rc = lprocfs_add_vars(fld->fld_proc_dir,
 254                               fld_server_proc_list, fld);
 255         if (rc) {
 256                 CERROR("can't init FLD proc, rc %d\n", rc);
 257                 GOTO(err_entry, rc);
 258         }
 259
 260         RETURN(0);
 261
 262 err_entry:
 263         lprocfs_remove(fld->fld_proc_entry);
 264 err_type:
 265         lprocfs_remove(fld->fld_proc_dir);
 266 err:
 267         fld->fld_proc_dir = NULL;
 268         fld->fld_proc_entry = NULL;
 269         return rc;
 270 }
 271
 272 static void fld_server_proc_fini(struct lu_server_fld *fld)
 273 {
 274         ENTRY;
 275         if (fld->fld_proc_entry) {
 276                 lprocfs_remove(fld->fld_proc_entry);
 277                 fld->fld_proc_entry = NULL;
 278         }
 279
 280         if (fld->fld_proc_dir) {
 281                 lprocfs_remove(fld->fld_proc_dir);
 282                 fld->fld_proc_dir = NULL;
 283         }
 284         EXIT;
 285 }
 286 #endif
 287
 288 int fld_server_init(struct lu_server_fld *fld,
 289                     const struct lu_context *ctx,
 290                     struct dt_device *dt,
 291                     const char *uuid)
 292 {
 293         int rc;
 294         struct ptlrpc_service_conf fld_conf = {
 295                 .psc_nbufs            = MDS_NBUFS,
 296                 .psc_bufsize          = MDS_BUFSIZE,
 297                 .psc_max_req_size     = FLD_MAXREQSIZE,
 298                 .psc_max_reply_size   = FLD_MAXREPSIZE,
 299                 .psc_req_portal       = FLD_REQUEST_PORTAL,
 300                 .psc_rep_portal       = MDC_REPLY_PORTAL,
 301                 .psc_watchdog_timeout = FLD_SERVICE_WATCHDOG_TIMEOUT,
 302                 .psc_num_threads      = FLD_NUM_THREADS,
 303                 .psc_ctx_tags         = LCT_DT_THREAD|LCT_MD_THREAD
 304         };
 305         ENTRY;
 306
 307         fld->fld_dt = dt;
 308         lu_device_get(&dt->dd_lu_dev);
 309
 310         snprintf(fld->fld_name, sizeof(fld->fld_name),
 311                  "%s-srv-%s", LUSTRE_FLD_NAME, uuid);
 312
 313         rc = fld_index_init(fld, ctx);
 314         if (rc)
 315                 GOTO(out, rc);
 316
 317 #ifdef LPROCFS
 318         rc = fld_server_proc_init(fld);
 319         if (rc)
 320                 GOTO(out, rc);
 321 #endif
 322
 323         fld->fld_service =
 324                 ptlrpc_init_svc_conf(&fld_conf, fld_req_handle,
 325                                      LUSTRE_FLD_NAME,
 326                                      fld->fld_proc_entry, NULL);
 327         if (fld->fld_service != NULL)
 328                 rc = ptlrpc_start_threads(NULL, fld->fld_service,
 329                                           LUSTRE_FLD_NAME);
 330         else
 331                 rc = -ENOMEM;
 332
 333         EXIT;
 334 out:
 335         if (rc)
 336                 fld_server_fini(fld, ctx);
 337         else
 338                 CDEBUG(D_INFO|D_WARNING, "Server FLD\n");
 339         return rc;
 340 }
 341 EXPORT_SYMBOL(fld_server_init);
 342
 343 void fld_server_fini(struct lu_server_fld *fld,
 344                      const struct lu_context *ctx)
 345 {
 346         ENTRY;
 347
 348 #ifdef LPROCFS
 349         fld_server_proc_fini(fld);
 350 #endif
 351
 352         if (fld->fld_service != NULL) {
 353                 ptlrpc_unregister_service(fld->fld_service);
 354                 fld->fld_service = NULL;
 355         }
 356
 357         if (fld->fld_dt != NULL) {
 358                 lu_device_put(&fld->fld_dt->dd_lu_dev);
 359                 fld_index_fini(fld, ctx);
 360                 fld->fld_dt = NULL;
 361         }
 362         EXIT;
 363 }
 364 EXPORT_SYMBOL(fld_server_fini);
 365
 366 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 367 MODULE_DESCRIPTION("Lustre FLD");
 368 MODULE_LICENSE("GPL");
 369
 370 cfs_module(mdd, "0.1.0", fld_mod_init, fld_mod_exit);
 371 #endif