lustre/mdc/mdc_request.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2001-2003 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.sf.net/projects/lustre/
   7  *
   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.
  11  *
  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.
  16  *
  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.
  20  */
  21
  22 #ifndef EXPORT_SYMTAB
  23 # define EXPORT_SYMTAB
  24 #endif
  25 #define DEBUG_SUBSYSTEM S_MDC
  26
  27 #ifdef __KERNEL__
  28 # include <linux/module.h>
  29 # include <linux/pagemap.h>
  30 # include <linux/miscdevice.h>
  31 # include <linux/init.h>
  32 #else
  33 # include <liblustre.h>
  34 #endif
  35
  36 #include <linux/obd_class.h>
  37 #include <linux/lustre_mds.h>
  38 #include <linux/lustre_dlm.h>
  39 #include <linux/lprocfs_status.h>
  40 #include "mdc_internal.h"
  41
  42 #define REQUEST_MINOR 244
  43
  44 static int mdc_cleanup(struct obd_device *obd, int flags);
  45
  46 extern int mds_queue_req(struct ptlrpc_request *);
  47 /* Helper that implements most of mdc_getstatus and signal_completed_replay. */
  48 /* XXX this should become mdc_get_info("key"), sending MDS_GET_INFO RPC */
  49 static int send_getstatus(struct obd_import *imp, struct ll_fid *rootfid,
  50                           int level, int msg_flags)
  51 {
  52         struct ptlrpc_request *req;
  53         struct mds_body *body;
  54         int rc, size = sizeof(*body);
  55         ENTRY;
  56
  57         req = ptlrpc_prep_req(imp, MDS_GETSTATUS, 1, &size, NULL);
  58         if (!req)
  59                 GOTO(out, rc = -ENOMEM);
  60
  61         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
  62         req->rq_send_state = level;
  63         req->rq_replen = lustre_msg_size(1, &size);
  64
  65         mdc_pack_req_body(req);
  66         req->rq_reqmsg->flags |= msg_flags;
  67         rc = ptlrpc_queue_wait(req);
  68
  69         if (!rc) {
  70                 body = lustre_swab_repbuf (req, 0, sizeof (*body),
  71                                            lustre_swab_mds_body);
  72                 if (body == NULL) {
  73                         CERROR ("Can't extract mds_body\n");
  74                         GOTO (out, rc = -EPROTO);
  75                 }
  76
  77                 memcpy(rootfid, &body->fid1, sizeof(*rootfid));
  78
  79                 CDEBUG(D_NET, "root ino="LPU64", last_committed="LPU64
  80                        ", last_xid="LPU64"\n",
  81                        rootfid->id, req->rq_repmsg->last_committed,
  82                        req->rq_repmsg->last_xid);
  83         }
  84
  85         EXIT;
  86  out:
  87         ptlrpc_req_finished(req);
  88         return rc;
  89 }
  90
  91 /* This should be mdc_get_info("rootfid") */
  92 int mdc_getstatus(struct obd_export *exp, struct ll_fid *rootfid)
  93 {
  94         return send_getstatus(class_exp2cliimp(exp), rootfid, LUSTRE_IMP_FULL,
  95                               0);
  96 }
  97
  98 int mdc_getattr_common(struct obd_export *exp, unsigned int ea_size,
  99                        struct ptlrpc_request *req)
 100 {
 101         struct mds_body *body;
 102         void            *eadata;
 103         int              rc;
 104         int              size[2] = {sizeof(*body), 0};
 105         int              bufcount = 1;
 106         ENTRY;
 107
 108         /* request message already built */
 109
 110         if (ea_size != 0) {
 111                 size[bufcount++] = ea_size;
 112                 CDEBUG(D_INODE, "reserved %u bytes for MD/symlink in packet\n",
 113                        ea_size);
 114         }
 115         req->rq_replen = lustre_msg_size(bufcount, size);
 116
 117         mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
 118         rc = ptlrpc_queue_wait(req);
 119         mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
 120         if (rc != 0)
 121                 RETURN (rc);
 122
 123         body = lustre_swab_repbuf (req, 0, sizeof (*body),
 124                                    lustre_swab_mds_body);
 125         if (body == NULL) {
 126                 CERROR ("Can't unpack mds_body\n");
 127                 RETURN (-EPROTO);
 128         }
 129
 130         CDEBUG(D_NET, "mode: %o\n", body->mode);
 131
 132         LASSERT_REPSWAB (req, 1);
 133         if (body->eadatasize != 0) {
 134                 /* reply indicates presence of eadata; check it's there... */
 135                 eadata = lustre_msg_buf (req->rq_repmsg, 1, body->eadatasize);
 136                 if (eadata == NULL) {
 137                         CERROR ("Missing/short eadata\n");
 138                         RETURN (-EPROTO);
 139                 }
 140         }
 141
 142         RETURN (0);
 143 }
 144
 145 int mdc_getattr(struct obd_export *exp, struct ll_fid *fid,
 146                 unsigned long valid, unsigned int ea_size,
 147                 struct ptlrpc_request **request)
 148 {
 149         struct ptlrpc_request *req;
 150         struct mds_body *body;
 151         int size = sizeof(*body);
 152         int rc;
 153         ENTRY;
 154
 155         /* XXX do we need to make another request here?  We just did a getattr
 156          *     to do the lookup in the first place.
 157          */
 158         req = ptlrpc_prep_req(class_exp2cliimp(exp), MDS_GETATTR, 1, &size,
 159                               NULL);
 160         if (!req)
 161                 GOTO(out, rc = -ENOMEM);
 162
 163         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 164         memcpy(&body->fid1, fid, sizeof(*fid));
 165         body->valid = valid;
 166         body->eadatasize = ea_size;
 167         mdc_pack_req_body(req);
 168
 169         rc = mdc_getattr_common(exp, ea_size, req);
 170         if (rc != 0) {
 171                 ptlrpc_req_finished (req);
 172                 req = NULL;
 173         }
 174  out:
 175         *request = req;
 176         RETURN (rc);
 177 }
 178
 179 int mdc_getattr_name(struct obd_export *exp, struct ll_fid *fid,
 180                      char *filename, int namelen, unsigned long valid,
 181                      unsigned int ea_size, struct ptlrpc_request **request)
 182 {
 183         struct ptlrpc_request *req;
 184         struct mds_body *body;
 185         int rc, size[2] = {sizeof(*body), namelen};
 186         ENTRY;
 187
 188         req = ptlrpc_prep_req(class_exp2cliimp(exp), MDS_GETATTR_NAME, 2,
 189                               size, NULL);
 190         if (!req)
 191                 GOTO(out, rc = -ENOMEM);
 192
 193         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 194         memcpy(&body->fid1, fid, sizeof(*fid));
 195         body->valid = valid;
 196         body->eadatasize = ea_size;
 197         mdc_pack_req_body(req);
 198
 199         LASSERT (strnlen (filename, namelen) == namelen - 1);
 200         memcpy(lustre_msg_buf(req->rq_reqmsg, 1, namelen), filename, namelen);
 201
 202         rc = mdc_getattr_common(exp, ea_size, req);
 203         if (rc != 0) {
 204                 ptlrpc_req_finished (req);
 205                 req = NULL;
 206         }
 207  out:
 208         *request = req;
 209         RETURN(rc);
 210 }
 211
 212 /* This should be called with both the request and the reply still packed. */
 213 void mdc_store_inode_generation(struct ptlrpc_request *req, int reqoff,
 214                                 int repoff)
 215 {
 216         struct mds_rec_create *rec =
 217                 lustre_msg_buf(req->rq_reqmsg, reqoff, sizeof(*rec));
 218         struct mds_body *body =
 219                 lustre_msg_buf(req->rq_repmsg, repoff, sizeof(*body));
 220
 221         LASSERT (rec != NULL);
 222         LASSERT (body != NULL);
 223
 224         memcpy(&rec->cr_replayfid, &body->fid1, sizeof rec->cr_replayfid);
 225         DEBUG_REQ(D_HA, req, "storing generation %u for ino "LPU64,
 226                   rec->cr_replayfid.generation, rec->cr_replayfid.id);
 227 }
 228
 229 int mdc_req2lustre_md(struct ptlrpc_request *req, int offset,
 230                       struct obd_export *exp,
 231                       struct lustre_md *md)
 232 {
 233         int rc = 0;
 234         ENTRY;
 235
 236         LASSERT(md);
 237         memset(md, 0, sizeof(*md));
 238
 239         md->body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*md->body));
 240         LASSERT (md->body != NULL);
 241         LASSERT_REPSWABBED (req, offset);
 242
 243         if (md->body->valid & OBD_MD_FLEASIZE) {
 244                 int lmmsize;
 245                 struct lov_mds_md *lmm;
 246
 247                 LASSERT(S_ISREG(md->body->mode));
 248
 249                 if (md->body->eadatasize == 0) {
 250                         CERROR ("OBD_MD_FLEASIZE set, but eadatasize 0\n");
 251                         RETURN(-EPROTO);
 252                 }
 253                 lmmsize = md->body->eadatasize;
 254                 lmm = lustre_msg_buf(req->rq_repmsg, offset + 1, lmmsize);
 255                 LASSERT (lmm != NULL);
 256                 LASSERT_REPSWABBED (req, offset + 1);
 257
 258                 rc = obd_unpackmd(exp, &md->lsm, lmm, lmmsize);
 259                 if (rc >= 0) {
 260                         LASSERT (rc >= sizeof (*md->lsm));
 261                         rc = 0;
 262                 }
 263         }
 264         RETURN(rc);
 265 }
 266
 267 static void mdc_commit_open(struct ptlrpc_request *req)
 268 {
 269         struct mdc_open_data *mod = req->rq_cb_data;
 270         if (mod == NULL)
 271                 return;
 272
 273         if (mod->mod_close_req != NULL)
 274                 mod->mod_close_req->rq_cb_data = NULL;
 275
 276         if (mod->mod_och != NULL)
 277                 mod->mod_och->och_mod = NULL;
 278
 279         OBD_FREE(mod, sizeof(*mod));
 280         req->rq_cb_data = NULL;
 281 }
 282
 283 static void mdc_replay_open(struct ptlrpc_request *req)
 284 {
 285         struct mdc_open_data *mod = req->rq_cb_data;
 286         struct obd_client_handle *och;
 287         struct ptlrpc_request *close_req;
 288         struct lustre_handle old;
 289         struct mds_body *body;
 290         ENTRY;
 291
 292         body = lustre_swab_repbuf(req, 1, sizeof(*body), lustre_swab_mds_body);
 293         LASSERT (body != NULL);
 294
 295         if (mod == NULL) {
 296                 DEBUG_REQ(D_ERROR, req,
 297                           "can't properly replay without open data");
 298                 EXIT;
 299                 return;
 300         }
 301
 302         och = mod->mod_och;
 303         if (och != NULL) {
 304                 struct lustre_handle *file_fh;
 305                 LASSERT(och->och_magic == OBD_CLIENT_HANDLE_MAGIC);
 306                 file_fh = &och->och_fh;
 307                 CDEBUG(D_HA, "updating handle from "LPX64" to "LPX64"\n",
 308                        file_fh->cookie, body->handle.cookie);
 309                 memcpy(&old, file_fh, sizeof(old));
 310                 memcpy(file_fh, &body->handle, sizeof(*file_fh));
 311         }
 312
 313         close_req = mod->mod_close_req;
 314         if (close_req != NULL) {
 315                 struct mds_body *close_body;
 316                 LASSERT(close_req->rq_reqmsg->opc == MDS_CLOSE);
 317                 close_body = lustre_msg_buf(close_req->rq_reqmsg, 0,
 318                                             sizeof(*close_body));
 319                 if (och != NULL)
 320                         LASSERT(!memcmp(&old, &close_body->handle, sizeof old));
 321                 DEBUG_REQ(D_HA, close_req, "updating close body with new fh");
 322                 memcpy(&close_body->handle, &body->handle,
 323                        sizeof(close_body->handle));
 324         }
 325
 326         EXIT;
 327 }
 328
 329 void mdc_set_open_replay_data(struct obd_client_handle *och,
 330                               struct ptlrpc_request *open_req)
 331 {
 332         struct mdc_open_data *mod;
 333         struct mds_rec_create *rec =
 334                 lustre_msg_buf(open_req->rq_reqmsg, 2, sizeof(*rec));
 335         struct mds_body *body =
 336                 lustre_msg_buf(open_req->rq_repmsg, 1, sizeof(*body));
 337
 338         LASSERT(rec != NULL);
 339         /* outgoing messages always in my byte order */
 340         LASSERT(body != NULL);
 341         /* incoming message in my byte order (it's been swabbed) */
 342         LASSERT_REPSWABBED(open_req, 1);
 343
 344         OBD_ALLOC(mod, sizeof(*mod));
 345         if (mod == NULL) {
 346                 DEBUG_REQ(D_ERROR, open_req, "can't allocate mdc_open_data");
 347                 return;
 348         }
 349
 350         och->och_mod = mod;
 351         mod->mod_och = och;
 352         mod->mod_open_req = open_req;
 353
 354         memcpy(&rec->cr_replayfid, &body->fid1, sizeof rec->cr_replayfid);
 355         open_req->rq_replay_cb = mdc_replay_open;
 356         open_req->rq_commit_cb = mdc_commit_open;
 357         open_req->rq_cb_data = mod;
 358         DEBUG_REQ(D_HA, open_req, "set up replay data");
 359 }
 360
 361 void mdc_clear_open_replay_data(struct obd_client_handle *och)
 362 {
 363         struct mdc_open_data *mod = och->och_mod;
 364
 365         /* Don't free the structure now (it happens in mdc_commit_open, after
 366          * we're sure we won't need to fix up the close request in the future),
 367          * but make sure that replay doesn't poke at the och, which is about to
 368          * be freed. */
 369         LASSERT(mod != (void *)0x5a5a5a5a);
 370         if (mod != NULL)
 371                 mod->mod_och = NULL;
 372         och->och_mod = NULL;
 373 }
 374
 375 static void mdc_commit_close(struct ptlrpc_request *req)
 376 {
 377         struct mdc_open_data *mod = req->rq_cb_data;
 378         struct ptlrpc_request *open_req;
 379         struct obd_import *imp = req->rq_import;
 380
 381         DEBUG_REQ(D_HA, req, "close req committed");
 382         if (mod == NULL)
 383                 return;
 384
 385         mod->mod_close_req = NULL;
 386         req->rq_cb_data = NULL;
 387         req->rq_commit_cb = NULL;
 388
 389         open_req = mod->mod_open_req;
 390         LASSERT(open_req != NULL);
 391         LASSERT(open_req != (void *)0x5a5a5a5a);
 392
 393         DEBUG_REQ(D_HA, open_req, "open req balanced");
 394         LASSERT(open_req->rq_transno != 0);
 395         LASSERT(open_req->rq_import == imp);
 396
 397         /* We no longer want to preserve this for transno-unconditional
 398          * replay. */
 399         spin_lock(&open_req->rq_lock);
 400         open_req->rq_replay = 0;
 401         spin_unlock(&open_req->rq_lock);
 402 }
 403
 404 static int mdc_close_interpret(struct ptlrpc_request *req, void *data, int rc)
 405 {
 406         union ptlrpc_async_args *aa = data;
 407         struct mdc_rpc_lock *rpc_lock = aa->pointer_arg[0];
 408         struct obd_device *obd = aa->pointer_arg[1];
 409
 410         if (rpc_lock == NULL) {
 411                 CERROR("called with NULL rpc_lock\n");
 412         } else {
 413                 mdc_put_rpc_lock(rpc_lock, NULL);
 414                 LASSERTF(req->rq_async_args.pointer_arg[0] ==
 415                          obd->u.cli.cl_rpc_lock, "%p != %p\n",
 416                          req->rq_async_args.pointer_arg[0],
 417                          obd->u.cli.cl_rpc_lock);
 418                 aa->pointer_arg[0] = NULL;
 419         }
 420         wake_up(&req->rq_reply_waitq);
 421         RETURN(rc);
 422 }
 423
 424 /* We can't use ptlrpc_check_reply, because we don't want to wake up for
 425  * anything but a reply or an error. */
 426 static int mdc_close_check_reply(struct ptlrpc_request *req)
 427 {
 428         int rc = 0;
 429         unsigned long flags;
 430
 431         spin_lock_irqsave(&req->rq_lock, flags);
 432         if (PTLRPC_REQUEST_COMPLETE(req)) {
 433                 rc = 1;
 434         }
 435         spin_unlock_irqrestore (&req->rq_lock, flags);
 436         return rc;
 437 }
 438
 439 static int go_back_to_sleep(void *unused)
 440 {
 441         return 0;
 442 }
 443
 444 int mdc_close(struct obd_export *exp, struct obdo *obdo,
 445               struct obd_client_handle *och, struct ptlrpc_request **request)
 446 {
 447         struct mds_body *body;
 448         struct obd_device *obd = class_exp2obd(exp);
 449         int reqsize = sizeof(*body);
 450         int rc, repsize[3] = {sizeof(*body),
 451                               obd->u.cli.cl_max_mds_easize,
 452                               obd->u.cli.cl_max_mds_cookiesize};
 453         struct ptlrpc_request *req;
 454         struct mdc_open_data *mod;
 455         struct l_wait_info lwi;
 456         ENTRY;
 457
 458         req = ptlrpc_prep_req(class_exp2cliimp(exp), MDS_CLOSE, 1, &reqsize,
 459                               NULL);
 460         if (req == NULL)
 461                 GOTO(out, rc = -ENOMEM);
 462
 463         /* Ensure that this close's handle is fixed up during replay. */
 464         LASSERT(och != NULL);
 465         mod = och->och_mod;
 466         if (likely(mod != NULL)) {
 467                 mod->mod_close_req = req;
 468                 DEBUG_REQ(D_HA, mod->mod_open_req, "matched open req %p",
 469                           mod->mod_open_req);
 470         } else {
 471                 CDEBUG(D_HA, "couldn't find open req; expecting close error\n");
 472         }
 473
 474         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 475         mdc_pack_fid(&body->fid1, obdo->o_id, 0, obdo->o_mode);
 476         memcpy(&body->handle, &och->och_fh, sizeof(body->handle));
 477         body->size = obdo->o_size;
 478         body->blocks = obdo->o_blocks;
 479         body->flags = obdo->o_flags;
 480         body->valid = obdo->o_valid;
 481
 482         req->rq_replen = lustre_msg_size(3, repsize);
 483         req->rq_commit_cb = mdc_commit_close;
 484         LASSERT(req->rq_cb_data == NULL);
 485         req->rq_cb_data = mod;
 486
 487         /* We hand a ref to the rpcd here, so we need another one of our own. */
 488         ptlrpc_request_addref(req);
 489
 490         mdc_get_rpc_lock(obd->u.cli.cl_rpc_lock, NULL);
 491         req->rq_interpret_reply = mdc_close_interpret;
 492         req->rq_async_args.pointer_arg[0] = obd->u.cli.cl_rpc_lock;
 493         req->rq_async_args.pointer_arg[1] = obd;
 494         ptlrpcd_add_req(req);
 495         lwi = LWI_TIMEOUT_INTR(MAX(req->rq_timeout * HZ, 1), go_back_to_sleep,
 496                                NULL, NULL);
 497         rc = l_wait_event(req->rq_reply_waitq, mdc_close_check_reply(req),
 498                           &lwi);
 499         if (rc == 0) {
 500                 LASSERTF(req->rq_repmsg != NULL, "req = %p", req);
 501                 rc = req->rq_repmsg->status;
 502                 if (req->rq_repmsg->type == PTL_RPC_MSG_ERR) {
 503                         DEBUG_REQ(D_ERROR, req, "type == PTL_RPC_MSG_ERR, err "
 504                                   "= %d", rc);
 505                         if (rc > 0)
 506                                 rc = -rc;
 507                 } else if (mod == NULL) {
 508                         CERROR("Unexpected: can't find mdc_open_data, but the "
 509                                "close succeeded.  Please tell CFS.\n");
 510                 }
 511                 if (!lustre_swab_repbuf(req, 0, sizeof(struct mds_body),
 512                                         lustre_swab_mds_body)) {
 513                         CERROR("Error unpacking mds_body\n");
 514                         rc = -EPROTO;
 515                 }
 516         }
 517         if (req->rq_async_args.pointer_arg[0] != NULL) {
 518                 CERROR("returned without dropping rpc_lock: rc %d\n", rc);
 519                 mdc_close_interpret(req, &req->rq_async_args, rc);
 520                 portals_debug_dumplog();
 521         }
 522
 523         EXIT;
 524  out:
 525         *request = req;
 526         return rc;
 527 }
 528
 529 int mdc_done_writing(struct obd_export *exp, struct obdo *obdo)
 530 {
 531         struct ptlrpc_request *req;
 532         struct mds_body *body;
 533         int rc, size = sizeof(*body);
 534         ENTRY;
 535
 536         req = ptlrpc_prep_req(class_exp2cliimp(exp), MDS_DONE_WRITING, 1,
 537                               &size, NULL);
 538         if (req == NULL)
 539                 RETURN(-ENOMEM);
 540
 541         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 542         mdc_pack_fid(&body->fid1, obdo->o_id, 0, obdo->o_mode);
 543         body->size = obdo->o_size;
 544         body->blocks = obdo->o_blocks;
 545         body->flags = obdo->o_flags;
 546         body->valid = obdo->o_valid;
 547 //        memcpy(&body->handle, &och->och_fh, sizeof(body->handle));
 548
 549         req->rq_replen = lustre_msg_size(1, &size);
 550
 551         rc = ptlrpc_queue_wait(req);
 552         ptlrpc_req_finished(req);
 553         RETURN(rc);
 554 }
 555
 556 int mdc_readpage(struct obd_export *exp, struct ll_fid *mdc_fid, __u64 offset,
 557                  struct page *page, struct ptlrpc_request **request)
 558 {
 559         struct obd_import *imp = class_exp2cliimp(exp);
 560         struct ptlrpc_request *req = NULL;
 561         struct ptlrpc_bulk_desc *desc = NULL;
 562         struct mds_body *body;
 563         int rc, size = sizeof(*body);
 564         ENTRY;
 565
 566         CDEBUG(D_INODE, "inode: %ld\n", (long)mdc_fid->id);
 567
 568         req = ptlrpc_prep_req(imp, MDS_READPAGE, 1, &size, NULL);
 569         if (req == NULL)
 570                 GOTO(out, rc = -ENOMEM);
 571         /* XXX FIXME bug 249 */
 572         req->rq_request_portal = MDS_READPAGE_PORTAL;
 573
 574         desc = ptlrpc_prep_bulk_imp(req, 1, BULK_PUT_SINK, MDS_BULK_PORTAL);
 575         if (desc == NULL)
 576                 GOTO(out, rc = -ENOMEM);
 577         /* NB req now owns desc and will free it when it gets freed */
 578
 579         ptlrpc_prep_bulk_page(desc, page, 0, PAGE_CACHE_SIZE);
 580
 581         mdc_readdir_pack(req, offset, PAGE_CACHE_SIZE, mdc_fid);
 582
 583         req->rq_replen = lustre_msg_size(1, &size);
 584         rc = ptlrpc_queue_wait(req);
 585
 586         if (rc == 0) {
 587                 body = lustre_swab_repbuf(req, 0, sizeof (*body),
 588                                           lustre_swab_mds_body);
 589                 if (body == NULL) {
 590                         CERROR("Can't unpack mds_body\n");
 591                         GOTO(out, rc = -EPROTO);
 592                 }
 593
 594                 if (req->rq_bulk->bd_nob_transferred != PAGE_CACHE_SIZE) {
 595                         CERROR ("Unexpected # bytes transferred: %d"
 596                                 " (%ld expected)\n",
 597                                 req->rq_bulk->bd_nob_transferred,
 598                                 PAGE_CACHE_SIZE);
 599                         GOTO (out, rc = -EPROTO);
 600                 }
 601         }
 602
 603         EXIT;
 604  out:
 605         *request = req;
 606         return rc;
 607 }
 608
 609 static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
 610                          void *karg, void *uarg)
 611 {
 612         struct obd_device *obd = exp->exp_obd;
 613         struct obd_ioctl_data *data = karg;
 614         struct obd_import *imp = obd->u.cli.cl_import;
 615         struct llog_ctxt *ctxt;
 616         int rc;
 617         ENTRY;
 618
 619 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 620         MOD_INC_USE_COUNT;
 621 #else
 622         if (!try_module_get(THIS_MODULE)) {
 623                 CERROR("Can't get module. Is it alive?");
 624                 return -EINVAL;
 625         }
 626 #endif
 627         switch (cmd) {
 628         case OBD_IOC_CLIENT_RECOVER:
 629                 rc = ptlrpc_recover_import(imp, data->ioc_inlbuf1);
 630                 if (rc < 0)
 631                         GOTO(out, rc);
 632                 GOTO(out, rc = 0);
 633         case IOC_OSC_SET_ACTIVE:
 634                 rc = ptlrpc_set_import_active(imp, data->ioc_offset);
 635                 GOTO(out, rc);
 636         case OBD_IOC_PARSE: {
 637                 ctxt = llog_get_context(exp->exp_obd, LLOG_CONFIG_REPL_CTXT);
 638                 rc = class_config_parse_llog(ctxt, data->ioc_inlbuf1, NULL);
 639                 GOTO(out, rc);
 640         }
 641 #ifdef __KERNEL__
 642         case OBD_IOC_LLOG_INFO:
 643         case OBD_IOC_LLOG_PRINT: {
 644                 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 645                 rc = llog_ioctl(ctxt, cmd, data);
 646
 647                 GOTO(out, rc);
 648         }
 649 #endif
 650         default:
 651                 CERROR("mdc_ioctl(): unrecognised ioctl %#x\n", cmd);
 652                 GOTO(out, rc = -ENOTTY);
 653         }
 654 out:
 655 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 656         MOD_DEC_USE_COUNT;
 657 #else
 658         module_put(THIS_MODULE);
 659 #endif
 660
 661         return rc;
 662 }
 663
 664 int mdc_set_info(struct obd_export *exp, obd_count keylen,
 665                  void *key, obd_count vallen, void *val)
 666 {
 667         int rc = -EINVAL;
 668
 669         if (keylen == strlen("initial_recov") &&
 670             memcmp(key, "initial_recov", strlen("initial_recov")) == 0) {
 671                 struct obd_import *imp = exp->exp_obd->u.cli.cl_import;
 672                 if (vallen != sizeof(int))
 673                         RETURN(-EINVAL);
 674                 imp->imp_initial_recov = *(int *)val;
 675                 CDEBUG(D_HA, "%s: set imp_no_init_recov = %d\n",
 676                        exp->exp_obd->obd_name,
 677                        imp->imp_initial_recov);
 678                 RETURN(0);
 679         }
 680
 681         RETURN(rc);
 682 }
 683
 684 static int mdc_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 685                       unsigned long max_age)
 686 {
 687         struct ptlrpc_request *req;
 688         struct obd_statfs *msfs;
 689         int rc, size = sizeof(*msfs);
 690         ENTRY;
 691
 692         /* We could possibly pass max_age in the request (as an absolute
 693          * timestamp or a "seconds.usec ago") so the target can avoid doing
 694          * extra calls into the filesystem if that isn't necessary (e.g.
 695          * during mount that would help a bit).  Having relative timestamps
 696          * is not so great if request processing is slow, while absolute
 697          * timestamps are not ideal because they need time synchronization. */
 698         req = ptlrpc_prep_req(obd->u.cli.cl_import, MDS_STATFS, 0, NULL, NULL);
 699         if (!req)
 700                 RETURN(-ENOMEM);
 701
 702         req->rq_replen = lustre_msg_size(1, &size);
 703
 704         mdc_get_rpc_lock(obd->u.cli.cl_rpc_lock, NULL);
 705         rc = ptlrpc_queue_wait(req);
 706         mdc_put_rpc_lock(obd->u.cli.cl_rpc_lock, NULL);
 707
 708         if (rc)
 709                 GOTO(out, rc);
 710
 711         msfs = lustre_swab_repbuf(req, 0, sizeof(*msfs),lustre_swab_obd_statfs);
 712         if (msfs == NULL) {
 713                 CERROR("Can't unpack obd_statfs\n");
 714                 GOTO(out, rc = -EPROTO);
 715         }
 716
 717         memcpy(osfs, msfs, sizeof (*msfs));
 718         EXIT;
 719 out:
 720         ptlrpc_req_finished(req);
 721
 722         return rc;
 723 }
 724
 725 static int mdc_pin(struct obd_export *exp, obd_id ino, __u32 gen, int type,
 726                    struct obd_client_handle *handle, int flag)
 727 {
 728         struct ptlrpc_request *req;
 729         struct mds_body *body;
 730         int rc, size = sizeof(*body);
 731         ENTRY;
 732
 733         req = ptlrpc_prep_req(class_exp2cliimp(exp), MDS_PIN, 1, &size, NULL);
 734         if (req == NULL)
 735                 RETURN(-ENOMEM);
 736
 737         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 738         mdc_pack_fid(&body->fid1, ino, gen, type);
 739         body->flags = flag;
 740
 741         req->rq_replen = lustre_msg_size(1, &size);
 742
 743         mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
 744         rc = ptlrpc_queue_wait(req);
 745         mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
 746         if (rc) {
 747                 CERROR("pin failed: %d\n", rc);
 748                 ptlrpc_req_finished(req);
 749                 RETURN(rc);
 750         }
 751
 752         body = lustre_swab_repbuf(req, 0, sizeof(*body), lustre_swab_mds_body);
 753         if (body == NULL) {
 754                 ptlrpc_req_finished(req);
 755                 RETURN(rc);
 756         }
 757
 758         memcpy(&handle->och_fh, &body->handle, sizeof(body->handle));
 759         handle->och_magic = OBD_CLIENT_HANDLE_MAGIC;
 760
 761         OBD_ALLOC(handle->och_mod, sizeof(*handle->och_mod));
 762         if (handle->och_mod == NULL) {
 763                 DEBUG_REQ(D_ERROR, req, "can't allocate mdc_open_data");
 764                 RETURN(-ENOMEM);
 765         }
 766         handle->och_mod->mod_open_req = req; /* will be dropped by unpin */
 767
 768         RETURN(rc);
 769 }
 770
 771 static int mdc_unpin(struct obd_export *exp,
 772                      struct obd_client_handle *handle, int flag)
 773 {
 774         struct ptlrpc_request *req;
 775         struct mds_body *body;
 776         int rc, size = sizeof(*body);
 777         ENTRY;
 778
 779         if (handle->och_magic != OBD_CLIENT_HANDLE_MAGIC)
 780                 RETURN(0);
 781
 782         req = ptlrpc_prep_req(class_exp2cliimp(exp), MDS_CLOSE, 1, &size, NULL);
 783         if (req == NULL)
 784                 RETURN(-ENOMEM);
 785
 786         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 787         memcpy(&body->handle, &handle->och_fh, sizeof(body->handle));
 788         body->flags = flag;
 789
 790         req->rq_replen = lustre_msg_size(0, NULL);
 791         mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
 792         rc = ptlrpc_queue_wait(req);
 793         mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
 794
 795         if (rc != 0)
 796                 CERROR("unpin failed: %d\n", rc);
 797
 798         ptlrpc_req_finished(req);
 799         ptlrpc_req_finished(handle->och_mod->mod_open_req);
 800         OBD_FREE(handle->och_mod, sizeof(*handle->och_mod));
 801         RETURN(rc);
 802 }
 803
 804 int mdc_sync(struct obd_export *exp, struct ll_fid *fid,
 805              struct ptlrpc_request **request)
 806 {
 807         struct ptlrpc_request *req;
 808         struct mds_body *body;
 809         int size = sizeof(*body);
 810         int rc;
 811         ENTRY;
 812
 813         req = ptlrpc_prep_req(class_exp2cliimp(exp), MDS_SYNC, 1,&size,NULL);
 814         if (!req)
 815                 RETURN(rc = -ENOMEM);
 816
 817         if (fid) {
 818                 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 819                 memcpy(&body->fid1, fid, sizeof(*fid));
 820                 mdc_pack_req_body(req);
 821         }
 822
 823         req->rq_replen = lustre_msg_size(1, &size);
 824
 825         rc = ptlrpc_queue_wait(req);
 826         if (rc || request == NULL)
 827                 ptlrpc_req_finished(req);
 828         else
 829                 *request = req;
 830
 831         RETURN(rc);
 832 }
 833
 834 static int mdc_import_event(struct obd_device *obd,
 835                             struct obd_import *imp,
 836                             enum obd_import_event event)
 837 {
 838         int rc = 0;
 839
 840         LASSERT(imp->imp_obd == obd);
 841
 842         switch (event) {
 843         case IMP_EVENT_DISCON: {
 844                 break;
 845         }
 846         case IMP_EVENT_INACTIVE: {
 847                 if (obd->obd_observer)
 848                         rc = obd_notify(obd->obd_observer, obd, 0);
 849                 break;
 850         }
 851         case IMP_EVENT_INVALIDATE: {
 852                 struct ldlm_namespace *ns = obd->obd_namespace;
 853
 854                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
 855
 856                 break;
 857         }
 858         case IMP_EVENT_ACTIVE: {
 859                 if (obd->obd_observer)
 860                         rc = obd_notify(obd->obd_observer, obd, 1);
 861                 break;
 862         }
 863         default:
 864                 CERROR("Unknown import event %d\n", event);
 865                 LBUG();
 866         }
 867         RETURN(rc);
 868 }
 869
 870 static int mdc_setup(struct obd_device *obd, obd_count len, void *buf)
 871 {
 872         struct client_obd *cli = &obd->u.cli;
 873         struct lprocfs_static_vars lvars;
 874         int rc;
 875         ENTRY;
 876
 877         OBD_ALLOC(cli->cl_rpc_lock, sizeof (*cli->cl_rpc_lock));
 878         if (!cli->cl_rpc_lock)
 879                 RETURN(-ENOMEM);
 880         mdc_init_rpc_lock(cli->cl_rpc_lock);
 881
 882         ptlrpcd_addref();
 883
 884         OBD_ALLOC(cli->cl_setattr_lock, sizeof (*cli->cl_setattr_lock));
 885         if (!cli->cl_setattr_lock)
 886                 GOTO(err_rpc_lock, rc = -ENOMEM);
 887         mdc_init_rpc_lock(cli->cl_setattr_lock);
 888
 889         rc = client_obd_setup(obd, len, buf);
 890         if (rc)
 891                 GOTO(err_setattr_lock, rc);
 892         lprocfs_init_vars(mdc, &lvars);
 893         lprocfs_obd_setup(obd, lvars.obd_vars);
 894
 895         rc = obd_llog_init(obd, obd, 0, NULL);
 896         if (rc) {
 897                 mdc_cleanup(obd, 0);
 898                 CERROR("failed to setup llogging subsystems\n");
 899         }
 900
 901         RETURN(rc);
 902
 903 err_setattr_lock:
 904         OBD_FREE(cli->cl_setattr_lock, sizeof (*cli->cl_setattr_lock));
 905 err_rpc_lock:
 906         OBD_FREE(cli->cl_rpc_lock, sizeof (*cli->cl_rpc_lock));
 907         ptlrpcd_decref();
 908         RETURN(rc);
 909 }
 910
 911 int mdc_init_ea_size(struct obd_device *obd, char *lov_name)
 912 {
 913         struct client_obd *cli = &obd->u.cli;
 914         struct obd_device *lov_obd;
 915         struct obd_export *exp;
 916         struct lustre_handle conn;
 917         struct lov_desc desc;
 918         int valsize;
 919         int rc;
 920
 921         lov_obd = class_name2obd(lov_name);
 922         if (!lov_obd) {
 923                 CERROR("MDC cannot locate LOV %s!\n", lov_name);
 924                 RETURN(-ENOTCONN);
 925         }
 926
 927         rc = obd_connect(&conn, lov_obd, &obd->obd_uuid);
 928         if (rc) {
 929                 CERROR("MDC failed connect to LOV %s (%d)\n", lov_name, rc);
 930                 RETURN(rc);
 931         }
 932         exp = class_conn2export(&conn);
 933
 934         valsize = sizeof(desc);
 935         rc = obd_get_info(exp, strlen("lovdesc") + 1, "lovdesc",
 936                           &valsize, &desc);
 937         if (rc == 0) {
 938                 cli->cl_max_mds_easize = obd_size_diskmd(exp, NULL);
 939                 cli->cl_max_mds_cookiesize = desc.ld_tgt_count *
 940                         sizeof(struct llog_cookie);
 941         }
 942         obd_disconnect(exp, 0);
 943         RETURN(rc);
 944 }
 945
 946 static int mdc_precleanup(struct obd_device *obd, int flags)
 947 {
 948         int rc = 0;
 949
 950         rc = obd_llog_finish(obd, 0);
 951         if (rc != 0)
 952                 CERROR("failed to cleanup llogging subsystems\n");
 953
 954         RETURN(rc);
 955 }
 956
 957 static int mdc_cleanup(struct obd_device *obd, int flags)
 958 {
 959         struct client_obd *cli = &obd->u.cli;
 960
 961         OBD_FREE(cli->cl_rpc_lock, sizeof (*cli->cl_rpc_lock));
 962         OBD_FREE(cli->cl_setattr_lock, sizeof (*cli->cl_setattr_lock));
 963
 964         lprocfs_obd_cleanup(obd);
 965         ptlrpcd_decref();
 966
 967         return client_obd_cleanup(obd, flags);
 968 }
 969
 970
 971 static int mdc_llog_init(struct obd_device *obd, struct obd_device *tgt,
 972                          int count, struct llog_catid *logid)
 973 {
 974         struct llog_ctxt *ctxt;
 975         int rc;
 976         ENTRY;
 977
 978         rc = llog_setup(obd, LLOG_CONFIG_REPL_CTXT, tgt, 0, NULL,
 979                         &llog_client_ops);
 980         if (rc == 0) {
 981                 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 982                 ctxt->loc_imp = obd->u.cli.cl_import;
 983         }
 984
 985         RETURN(rc);
 986 }
 987
 988 static int mdc_llog_finish(struct obd_device *obd, int count)
 989 {
 990         int rc;
 991         ENTRY;
 992
 993         rc = llog_cleanup(llog_get_context(obd, LLOG_CONFIG_REPL_CTXT));
 994         RETURN(rc);
 995 }
 996
 997 struct obd_ops mdc_obd_ops = {
 998         .o_owner        = THIS_MODULE,
 999         .o_setup        = mdc_setup,
1000         .o_precleanup   = mdc_precleanup,
1001         .o_cleanup      = mdc_cleanup,
1002         .o_connect      = client_connect_import,
1003         .o_disconnect   = client_disconnect_export,
1004         .o_iocontrol    = mdc_iocontrol,
1005         .o_set_info     = mdc_set_info,
1006         .o_statfs       = mdc_statfs,
1007         .o_pin          = mdc_pin,
1008         .o_unpin        = mdc_unpin,
1009         .o_import_event = mdc_import_event,
1010         .o_llog_init    = mdc_llog_init,
1011         .o_llog_finish  = mdc_llog_finish,
1012 };
1013
1014 int __init mdc_init(void)
1015 {
1016         struct lprocfs_static_vars lvars;
1017         lprocfs_init_vars(mdc, &lvars);
1018         return class_register_type(&mdc_obd_ops, lvars.module_vars,
1019                                    LUSTRE_MDC_NAME);
1020 }
1021
1022 #ifdef __KERNEL__
1023 static void /*__exit*/ mdc_exit(void)
1024 {
1025         class_unregister_type(LUSTRE_MDC_NAME);
1026 }
1027
1028 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1029 MODULE_DESCRIPTION("Lustre Metadata Client");
1030 MODULE_LICENSE("GPL");
1031
1032 EXPORT_SYMBOL(mdc_req2lustre_md);
1033 EXPORT_SYMBOL(mdc_change_cbdata);
1034 EXPORT_SYMBOL(mdc_getstatus);
1035 EXPORT_SYMBOL(mdc_getattr);
1036 EXPORT_SYMBOL(mdc_getattr_name);
1037 EXPORT_SYMBOL(mdc_create);
1038 EXPORT_SYMBOL(mdc_unlink);
1039 EXPORT_SYMBOL(mdc_rename);
1040 EXPORT_SYMBOL(mdc_link);
1041 EXPORT_SYMBOL(mdc_readpage);
1042 EXPORT_SYMBOL(mdc_setattr);
1043 EXPORT_SYMBOL(mdc_close);
1044 EXPORT_SYMBOL(mdc_done_writing);
1045 EXPORT_SYMBOL(mdc_sync);
1046 EXPORT_SYMBOL(mdc_set_open_replay_data);
1047 EXPORT_SYMBOL(mdc_clear_open_replay_data);
1048 EXPORT_SYMBOL(mdc_store_inode_generation);
1049 EXPORT_SYMBOL(mdc_init_ea_size);
1050
1051 module_init(mdc_init);
1052 module_exit(mdc_exit);
1053 #endif