lustre/mds/handler.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  linux/mds/handler.c
   5  *
   6  *  Lustre Metadata Server (mds) request handler
   7  *
   8  *  Copyright (C) 2001, 2002 Cluster File Systems, Inc.
   9  *
  10  *  This code is issued under the GNU General Public License.
  11  *  See the file COPYING in this distribution
  12  *
  13  *  by Peter Braam <braam@clusterfs.com> &
  14  *     Andreas Dilger <braam@clusterfs.com>
  15  *
  16  */
  17
  18 #define EXPORT_SYMTAB
  19 #define DEBUG_SUBSYSTEM S_MDS
  20
  21 #include <linux/module.h>
  22 #include <linux/lustre_mds.h>
  23 #include <linux/lustre_dlm.h>
  24 #include <linux/init.h>
  25
  26 extern int mds_get_lovtgts(struct obd_device *obd, int tgt_count,
  27                            uuid_t *uuidarray);
  28 extern int mds_get_lovdesc(struct obd_device *obd, struct lov_desc *desc);
  29 extern int mds_update_last_rcvd(struct mds_obd *mds, void *handle,
  30                                 struct ptlrpc_request *req);
  31 static int mds_cleanup(struct obd_device * obddev);
  32
  33 inline struct mds_obd *mds_req2mds(struct ptlrpc_request *req)
  34 {
  35         return &req->rq_export->exp_obd->u.mds;
  36 }
  37
  38
  39 /* Assumes caller has already pushed into the kernel filesystem context */
  40 static int mds_sendpage(struct ptlrpc_request *req, struct file *file,
  41                         __u64 offset)
  42 {
  43         int rc = 0;
  44         struct mds_obd *mds = mds_req2mds(req);
  45         struct ptlrpc_bulk_desc *desc;
  46         struct ptlrpc_bulk_page *bulk;
  47         char *buf;
  48         ENTRY;
  49
  50         desc = ptlrpc_prep_bulk(req->rq_connection);
  51         if (desc == NULL)
  52                 GOTO(out, rc = -ENOMEM);
  53
  54         bulk = ptlrpc_prep_bulk_page(desc);
  55         if (bulk == NULL)
  56                 GOTO(cleanup_bulk, rc = -ENOMEM);
  57
  58         OBD_ALLOC(buf, PAGE_SIZE);
  59         if (buf == NULL)
  60                 GOTO(cleanup_bulk, rc = -ENOMEM);
  61
  62         rc = mds_fs_readpage(mds, file, buf, PAGE_SIZE, (loff_t *)&offset);
  63
  64         if (rc != PAGE_SIZE)
  65                 GOTO(cleanup_buf, rc = -EIO);
  66
  67         bulk->b_xid = req->rq_xid;
  68         bulk->b_buf = buf;
  69         bulk->b_buflen = PAGE_SIZE;
  70         desc->b_portal = MDS_BULK_PORTAL;
  71
  72         rc = ptlrpc_send_bulk(desc);
  73         if (rc)
  74                 GOTO(cleanup_buf, rc);
  75
  76         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
  77                 CERROR("obd_fail_loc=%x, fail operation rc=%d\n",
  78                        OBD_FAIL_MDS_SENDPAGE, rc);
  79                 ptlrpc_abort_bulk(desc);
  80                 GOTO(cleanup_buf, rc);
  81         }
  82
  83         wait_event(desc->b_waitq, ptlrpc_check_bulk_sent(desc));
  84         if (desc->b_flags & PTL_RPC_FL_INTR)
  85                 GOTO(cleanup_buf, rc = -EINTR);
  86
  87         EXIT;
  88  cleanup_buf:
  89         OBD_FREE(buf, PAGE_SIZE);
  90  cleanup_bulk:
  91         ptlrpc_free_bulk(desc);
  92  out:
  93         return rc;
  94 }
  95
  96 /* 'dir' is a inode for which a lock has already been taken */
  97 struct dentry *mds_name2locked_dentry(struct obd_device *obd,
  98                                       struct dentry *dir, struct vfsmount **mnt,
  99                                       char *name, int namelen, int lock_mode,
 100                                       struct lustre_handle *lockh,
 101                                       int dir_lock_mode)
 102 {
 103         struct dentry *dchild;
 104         int flags, rc;
 105         __u64 res_id[3] = {0};
 106         ENTRY;
 107
 108         down(&dir->d_inode->i_sem);
 109         dchild = lookup_one_len(name, dir, namelen);
 110         if (IS_ERR(dchild)) {
 111                 CERROR("child lookup error %ld\n", PTR_ERR(dchild));
 112                 up(&dir->d_inode->i_sem);
 113                 LBUG();
 114                 RETURN(dchild);
 115         }
 116         if (dir_lock_mode != LCK_EX && dir_lock_mode != LCK_PW) {
 117                 up(&dir->d_inode->i_sem);
 118                 ldlm_lock_decref(lockh, dir_lock_mode);
 119         }
 120
 121         if (lock_mode == 0 || !dchild->d_inode)
 122                 RETURN(dchild);
 123
 124         res_id[0] = dchild->d_inode->i_ino;
 125         rc = ldlm_match_or_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 126                                    res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 127                                    &flags, ldlm_completion_ast,
 128                                    mds_blocking_ast, NULL, 0, lockh);
 129         if (rc != ELDLM_OK) {
 130                 l_dput(dchild);
 131                 up(&dir->d_inode->i_sem);
 132                 RETURN(ERR_PTR(-ENOLCK)); /* XXX translate ldlm code */
 133         }
 134
 135         RETURN(dchild);
 136 }
 137
 138 struct dentry *mds_fid2locked_dentry(struct obd_device *obd, struct ll_fid *fid,
 139                                      struct vfsmount **mnt, int lock_mode,
 140                                      struct lustre_handle *lockh)
 141 {
 142         struct mds_obd *mds = &obd->u.mds;
 143         struct dentry *de = mds_fid2dentry(mds, fid, mnt), *retval = de;
 144         int flags, rc;
 145         __u64 res_id[3] = {0};
 146         ENTRY;
 147
 148         if (IS_ERR(de))
 149                 RETURN(de);
 150
 151         res_id[0] = de->d_inode->i_ino;
 152         rc = ldlm_match_or_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 153                                    res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 154                                    &flags, ldlm_completion_ast,
 155                                    mds_blocking_ast, NULL, 0, lockh);
 156         if (rc != ELDLM_OK) {
 157                 l_dput(de);
 158                 retval = ERR_PTR(-ENOLCK); /* XXX translate ldlm code */
 159         }
 160
 161         RETURN(retval);
 162 }
 163
 164 struct dentry *mds_fid2dentry(struct mds_obd *mds, struct ll_fid *fid,
 165                               struct vfsmount **mnt)
 166 {
 167         /* stolen from NFS */
 168         struct super_block *sb = mds->mds_sb;
 169         unsigned long ino = fid->id;
 170         __u32 generation = fid->generation;
 171         struct inode *inode;
 172         struct list_head *lp;
 173         struct dentry *result;
 174
 175         if (ino == 0)
 176                 RETURN(ERR_PTR(-ESTALE));
 177
 178         inode = iget(sb, ino);
 179         if (inode == NULL)
 180                 RETURN(ERR_PTR(-ENOMEM));
 181
 182         CDEBUG(D_DENTRY, "--> mds_fid2dentry: sb %p\n", inode->i_sb);
 183
 184         if (is_bad_inode(inode) ||
 185             (generation && inode->i_generation != generation)) {
 186                 /* we didn't find the right inode.. */
 187                 CERROR("bad inode %lu, link: %d ct: %d or version  %u/%u\n",
 188                        inode->i_ino, inode->i_nlink,
 189                        atomic_read(&inode->i_count), inode->i_generation,
 190                        generation);
 191                 LBUG();
 192                 iput(inode);
 193                 RETURN(ERR_PTR(-ESTALE));
 194         }
 195
 196         /* now to find a dentry. If possible, get a well-connected one */
 197         if (mnt)
 198                 *mnt = mds->mds_vfsmnt;
 199         spin_lock(&dcache_lock);
 200         for (lp = inode->i_dentry.next; lp != &inode->i_dentry ; lp=lp->next) {
 201                 result = list_entry(lp,struct dentry, d_alias);
 202                 if (! (result->d_flags & DCACHE_NFSD_DISCONNECTED)) {
 203                         dget_locked(result);
 204                         result->d_vfs_flags |= DCACHE_REFERENCED;
 205                         spin_unlock(&dcache_lock);
 206                         iput(inode);
 207                         if (mnt)
 208                                 mntget(*mnt);
 209                         return result;
 210                 }
 211         }
 212         spin_unlock(&dcache_lock);
 213         result = d_alloc_root(inode);
 214         if (result == NULL) {
 215                 iput(inode);
 216                 return ERR_PTR(-ENOMEM);
 217         }
 218         if (mnt)
 219                 mntget(*mnt);
 220         result->d_flags |= DCACHE_NFSD_DISCONNECTED;
 221         return result;
 222 }
 223
 224 static int mds_connect(struct lustre_handle *conn, struct obd_device *obd,
 225                        char *cluuid)
 226 {
 227         int rc;
 228         struct list_head *p, *n;
 229
 230         MOD_INC_USE_COUNT;
 231         if (cluuid) {
 232                 list_for_each_safe(p, n, &obd->obd_exports) {
 233                         struct obd_export *exp;
 234                         struct mds_client_data *mcd;
 235
 236                         exp = list_entry(p, struct obd_export, exp_chain);
 237                         mcd = exp->exp_mds_data.med_mcd;
 238                         if (mcd && !memcmp(cluuid, mcd->mcd_uuid,
 239                                            sizeof(mcd->mcd_uuid))) {
 240                                 CDEBUG(D_INFO,
 241                                        "existing export for UUID '%s' at %p\n",
 242                                        cluuid, exp);
 243                                 if (exp->exp_obd != obd)
 244                                         LBUG();
 245                                 exp->exp_rconnh.addr = conn->addr;
 246                                 exp->exp_rconnh.cookie = conn->cookie;
 247                                 conn->addr = (__u64) (unsigned long)exp;
 248                                 conn->cookie = exp->exp_cookie;
 249                                 CDEBUG(D_IOCTL, "connect: addr %Lx cookie %Lx\n",
 250                                        (long long)conn->addr,
 251                                        (long long)conn->cookie);
 252                                 return 0;
 253                         }
 254                 }
 255         }
 256         rc = class_connect(conn, obd, NULL);
 257
 258         if (rc)
 259                 MOD_DEC_USE_COUNT;
 260
 261         return rc;
 262 }
 263
 264 static int mds_disconnect(struct lustre_handle *conn)
 265 {
 266         int rc;
 267
 268         rc = class_disconnect(conn);
 269         if (!rc)
 270                 MOD_DEC_USE_COUNT;
 271
 272         return rc;
 273 }
 274
 275 /* FIXME: the error cases need fixing to avoid leaks */
 276 static int mds_getstatus(struct ptlrpc_request *req)
 277 {
 278         struct mds_obd *mds = mds_req2mds(req);
 279         struct mds_body *body;
 280         struct mds_client_data *mcd;
 281         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 282         int rc, size = sizeof(*body);
 283         ENTRY;
 284
 285         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 286         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK)) {
 287                 CERROR("mds: out of memory for message: size=%d\n", size);
 288                 req->rq_status = -ENOMEM;
 289                 RETURN(0);
 290         }
 291
 292         body = lustre_msg_buf(req->rq_reqmsg, 0);
 293         mds_unpack_body(body);
 294
 295         /* Anything we need to do here with the client's trans no or so? */
 296         body = lustre_msg_buf(req->rq_repmsg, 0);
 297         memcpy(&body->fid1, &mds->mds_rootfid, sizeof(body->fid1));
 298
 299         mcd = med->med_mcd;
 300         if (!mcd) {
 301                 int rc;
 302
 303                 CDEBUG(D_INFO, "allocating new client data for UUID '%s'\n",
 304                         ptlrpc_req_to_uuid(req));
 305                 OBD_ALLOC(mcd, sizeof(*mcd));
 306                 if (!mcd) {
 307                         CERROR("mds: out of memory for client data\n");
 308                         req->rq_status = -ENOMEM;
 309                         RETURN(0);
 310                 }
 311                 memcpy(mcd->mcd_uuid, ptlrpc_req_to_uuid(req),
 312                        sizeof(mcd->mcd_uuid));
 313                 rc = mds_client_add(mds, med, -1);
 314                 if (rc) {
 315                         req->rq_status = rc;
 316                         OBD_FREE(mcd, sizeof(*mcd));
 317                         RETURN(0);
 318                 }
 319                 med->med_mcd = mcd;
 320         } else {
 321                 CDEBUG(D_INFO, "found existing data for UUID '%s' at #%d\n",
 322                        mcd->mcd_uuid, med->med_off);
 323         }
 324         /* mcd_last_xid is is stored in little endian on the disk and
 325            mds_pack_rep_body converts it to network order */
 326         body->last_xid = le32_to_cpu(mcd->mcd_last_xid);
 327         mds_pack_rep_body(req);
 328         RETURN(0);
 329 }
 330
 331 static int mds_getlovinfo(struct ptlrpc_request *req)
 332 {
 333         struct mds_obd *mds = mds_req2mds(req);
 334         struct mds_status_req *streq;
 335         struct lov_desc *desc;
 336         int tgt_count;
 337         int rc, size[2] = {sizeof(*desc)};
 338         ENTRY;
 339
 340         streq = lustre_msg_buf(req->rq_reqmsg, 0);
 341         streq->flags = NTOH__u32(streq->flags);
 342         streq->repbuf = NTOH__u32(streq->repbuf);
 343         size[1] = streq->repbuf;
 344
 345         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 346         if (rc) {
 347                 CERROR("mds: out of memory for message: size=%d\n", size[1]);
 348                 req->rq_status = -ENOMEM;
 349                 RETURN(0);
 350         }
 351
 352         desc = lustre_msg_buf(req->rq_repmsg, 0);
 353         rc = mds_get_lovdesc(req->rq_obd, desc);
 354         if (rc != 0 ) {
 355                 CERROR("mds_get_lovdesc error %d", rc);
 356                 req->rq_status = rc;
 357                 RETURN(0);
 358         }
 359
 360         tgt_count = NTOH__u32(desc->ld_tgt_count);
 361         if (tgt_count * sizeof(uuid_t) > streq->repbuf) {
 362                 CERROR("too many targets, enlarge client buffers\n");
 363                 req->rq_status = -ENOSPC;
 364                 RETURN(0);
 365         }
 366
 367         mds->mds_max_mdsize = sizeof(desc) + tgt_count * sizeof(uuid_t);
 368         rc = mds_get_lovtgts(req->rq_obd, tgt_count,
 369                              lustre_msg_buf(req->rq_repmsg, 1));
 370         if (rc) {
 371                 CERROR("get_lovtgts error %d\n", rc);
 372                 req->rq_status = rc;
 373                 RETURN(0);
 374         }
 375         RETURN(0);
 376 }
 377
 378 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 379                      void *data, __u32 data_len)
 380 {
 381         struct lustre_handle lockh;
 382         ENTRY;
 383
 384         ldlm_lock2handle(lock, &lockh);
 385         if (ldlm_cli_cancel(&lockh) < 0)
 386                 LBUG();
 387         RETURN(0);
 388 }
 389
 390 static int mds_getattr_name(int offset, struct ptlrpc_request *req)
 391 {
 392         struct mds_obd *mds = mds_req2mds(req);
 393         struct obd_device *obd = req->rq_export->exp_obd;
 394         struct obd_run_ctxt saved;
 395         struct mds_body *body;
 396         struct dentry *de = NULL, *dchild = NULL;
 397         struct inode *dir;
 398         struct lustre_handle lockh;
 399         char *name;
 400         int namelen, flags, lock_mode, rc = 0;
 401         __u64 res_id[3] = {0, 0, 0};
 402         ENTRY;
 403
 404         if (strcmp(req->rq_export->exp_obd->obd_type->typ_name, "mds") != 0)
 405                 LBUG();
 406
 407         if (req->rq_reqmsg->bufcount <= offset + 1) {
 408                 LBUG();
 409                 GOTO(out_pre_de, rc = -EINVAL);
 410         }
 411
 412         body = lustre_msg_buf(req->rq_reqmsg, offset);
 413         name = lustre_msg_buf(req->rq_reqmsg, offset + 1);
 414         namelen = req->rq_reqmsg->buflens[offset + 1];
 415         /* requests were at offset 2, replies go back at 1 */
 416         if (offset)
 417                 offset = 1;
 418
 419         push_ctxt(&saved, &mds->mds_ctxt);
 420         de = mds_fid2dentry(mds, &body->fid1, NULL);
 421         if (IS_ERR(de)) {
 422                 LBUG();
 423                 GOTO(out_pre_de, rc = -ESTALE);
 424         }
 425
 426         dir = de->d_inode;
 427         CDEBUG(D_INODE, "parent ino %ld\n", dir->i_ino);
 428
 429         lock_mode = (req->rq_reqmsg->opc == MDS_REINT) ? LCK_CW : LCK_PW;
 430         res_id[0] = dir->i_ino;
 431
 432         rc = ldlm_lock_match(obd->obd_namespace, res_id, LDLM_PLAIN,
 433                              NULL, 0, lock_mode, &lockh);
 434         if (rc == 0) {
 435                 LDLM_DEBUG_NOLOCK("enqueue res %Lu", res_id[0]);
 436                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 437                                       res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 438                                       &flags, ldlm_completion_ast,
 439                                       mds_blocking_ast, NULL, 0, &lockh);
 440                 if (rc != ELDLM_OK) {
 441                         CERROR("lock enqueue: err: %d\n", rc);
 442                         GOTO(out_create_de, rc = -EIO);
 443                 }
 444         }
 445         ldlm_lock_dump((void *)(unsigned long)lockh.addr);
 446
 447         down(&dir->i_sem);
 448         dchild = lookup_one_len(name, de, namelen - 1);
 449         if (IS_ERR(dchild)) {
 450                 CDEBUG(D_INODE, "child lookup error %ld\n", PTR_ERR(dchild));
 451                 up(&dir->i_sem);
 452                 LBUG();
 453                 GOTO(out_create_dchild, rc = -ESTALE);
 454         }
 455
 456         if (dchild->d_inode) {
 457                 struct mds_body *body;
 458                 struct inode *inode = dchild->d_inode;
 459                 CDEBUG(D_INODE, "child exists (dir %ld, name %s, ino %ld)\n",
 460                        dir->i_ino, name, dchild->d_inode->i_ino);
 461
 462                 body = lustre_msg_buf(req->rq_repmsg, offset);
 463                 mds_pack_inode2fid(&body->fid1, inode);
 464                 mds_pack_inode2body(body, inode);
 465                 if (S_ISREG(inode->i_mode)) {
 466                         struct lov_stripe_md *md;
 467                         md = lustre_msg_buf(req->rq_repmsg, offset + 1);
 468                         md->lmd_easize = mds->mds_max_mdsize;
 469                         mds_fs_get_md(mds, inode, md);
 470                 }
 471                 /* now a normal case for intent locking */
 472                 rc = 0;
 473         } else
 474                 rc = -ENOENT;
 475
 476         EXIT;
 477 out_create_dchild:
 478         l_dput(dchild);
 479         up(&dir->i_sem);
 480         ldlm_lock_decref(&lockh, lock_mode);
 481 out_create_de:
 482         l_dput(de);
 483 out_pre_de:
 484         req->rq_status = rc;
 485         pop_ctxt(&saved);
 486         return 0;
 487 }
 488
 489
 490 static int mds_getattr(int offset, struct ptlrpc_request *req)
 491 {
 492         struct mds_obd *mds = mds_req2mds(req);
 493         struct obd_run_ctxt saved;
 494         struct dentry *de;
 495         struct inode *inode;
 496         struct mds_body *body;
 497         int rc, size[2] = {sizeof(*body)}, bufcount = 1;
 498         ENTRY;
 499
 500         body = lustre_msg_buf(req->rq_reqmsg, offset);
 501         push_ctxt(&saved, &mds->mds_ctxt);
 502         de = mds_fid2dentry(mds, &body->fid1, NULL);
 503         if (IS_ERR(de)) {
 504                 GOTO(out_pop, rc = -ENOENT);
 505         }
 506
 507         inode = de->d_inode;
 508         if (S_ISREG(body->fid1.f_type)) {
 509                 bufcount = 2;
 510                 size[1] = mds->mds_max_mdsize;
 511         } else if (body->valid & OBD_MD_LINKNAME) {
 512                 bufcount = 2;
 513                 size[1] = inode->i_size;
 514         }
 515
 516         rc = lustre_pack_msg(bufcount, size, NULL, &req->rq_replen,
 517                              &req->rq_repmsg);
 518         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK)) {
 519                 CERROR("mds: out of memory\n");
 520                 GOTO(out, rc);
 521         }
 522
 523         if (body->valid & OBD_MD_LINKNAME) {
 524                 char *tmp = lustre_msg_buf(req->rq_repmsg, 1);
 525
 526                 rc = inode->i_op->readlink(de, tmp, size[1]);
 527
 528                 if (rc < 0) {
 529                         CERROR("readlink failed: %d\n", rc);
 530                         GOTO(out, rc);
 531                 }
 532         }
 533
 534         body = lustre_msg_buf(req->rq_repmsg, 0);
 535         body->ino = inode->i_ino;
 536         body->generation = inode->i_generation;
 537         body->atime = inode->i_atime;
 538         body->ctime = inode->i_ctime;
 539         body->mtime = inode->i_mtime;
 540         body->uid = inode->i_uid;
 541         body->gid = inode->i_gid;
 542         body->size = inode->i_size;
 543         body->mode = inode->i_mode;
 544         body->nlink = inode->i_nlink;
 545         body->valid = (OBD_MD_FLID | OBD_MD_FLATIME | OBD_MD_FLCTIME |
 546                        OBD_MD_FLMTIME | OBD_MD_FLSIZE | OBD_MD_FLUID |
 547                        OBD_MD_FLGID | OBD_MD_FLNLINK | OBD_MD_FLGENER |
 548                        OBD_MD_FLMODE);
 549
 550         if (S_ISREG(inode->i_mode)) {
 551                 rc = mds_fs_get_md(mds, inode,
 552                                      lustre_msg_buf(req->rq_repmsg, 1));
 553                 if (rc < 0) {
 554                         CERROR("mds_fs_get_md failed: %d\n", rc);
 555                         GOTO(out, rc);
 556                 }
 557                 body->valid |= OBD_MD_FLEASIZE;
 558         } else if (S_ISLNK(inode->i_mode))
 559                 body->valid |= OBD_MD_LINKNAME;
 560
 561 out:
 562         l_dput(de);
 563 out_pop:
 564         pop_ctxt(&saved);
 565         req->rq_status = rc;
 566         RETURN(0);
 567 }
 568
 569 static int mds_statfs(struct ptlrpc_request *req)
 570 {
 571         struct mds_obd *mds = mds_req2mds(req);
 572         struct obd_statfs *osfs;
 573         struct statfs sfs;
 574         int rc, size = sizeof(*osfs);
 575         ENTRY;
 576
 577         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
 578                              &req->rq_repmsg);
 579         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK)) {
 580                 CERROR("mds: statfs lustre_pack_msg failed: rc = %d\n", rc);
 581                 GOTO(out, rc);
 582         }
 583
 584         rc = vfs_statfs(mds->mds_sb, &sfs);
 585         if (rc) {
 586                 CERROR("mds: statfs failed: rc %d\n", rc);
 587                 GOTO(out, rc);
 588         }
 589         osfs = lustre_msg_buf(req->rq_repmsg, 0);
 590         memset(osfs, 0, size);
 591         obd_statfs_pack(osfs, &sfs);
 592
 593 out:
 594         req->rq_status = rc;
 595         RETURN(0);
 596 }
 597
 598 static int mds_open(struct ptlrpc_request *req)
 599 {
 600         struct dentry *de;
 601         struct mds_body *body;
 602         struct file *file;
 603         struct vfsmount *mnt;
 604         struct mds_obd *mds = mds_req2mds(req);
 605         struct mds_export_data *med;
 606         __u32 flags;
 607         struct list_head *tmp;
 608         struct mds_file_data *mfd;
 609         int rc, size = sizeof(*body);
 610         ENTRY;
 611
 612         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 613         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK)) {
 614                 CERROR("mds: out of memory\n");
 615                 req->rq_status = -ENOMEM;
 616                 RETURN(0);
 617         }
 618
 619         body = lustre_msg_buf(req->rq_reqmsg, 0);
 620
 621         /* was this animal open already? */
 622         /* XXX we should only check on re-open, or do a refcount... */
 623         med = &req->rq_export->exp_mds_data;
 624         list_for_each(tmp, &med->med_open_head) {
 625                 struct mds_file_data *fd;
 626                 fd = list_entry(tmp, struct mds_file_data, mfd_list);
 627                 if (body->extra == fd->mfd_clientfd &&
 628                     body->fid1.id == fd->mfd_file->f_dentry->d_inode->i_ino) {
 629                         CERROR("Re opening %Ld\n", body->fid1.id);
 630                         RETURN(0);
 631                 }
 632         }
 633
 634         OBD_ALLOC(mfd, sizeof(*mfd));
 635         if (!mfd) {
 636                 CERROR("mds: out of memory\n");
 637                 req->rq_status = -ENOMEM;
 638                 RETURN(0);
 639         }
 640
 641         de = mds_fid2dentry(mds, &body->fid1, &mnt);
 642         if (IS_ERR(de)) {
 643                 req->rq_status = -ENOENT;
 644                 RETURN(0);
 645         }
 646
 647         /* check if this inode has seen a delayed object creation */
 648         if (req->rq_reqmsg->bufcount > 1) {
 649                 void *handle;
 650                 struct lov_stripe_md *md;
 651                 struct inode *inode = de->d_inode;
 652                 int rc;
 653
 654                 md = lustre_msg_buf(req->rq_reqmsg, 1);
 655
 656                 handle = mds_fs_start(mds, de->d_inode, MDS_FSOP_SETATTR);
 657                 if (!handle) {
 658                         req->rq_status = -ENOMEM;
 659                         RETURN(0);
 660                 }
 661
 662                 /* XXX error handling */
 663                 rc = mds_fs_set_md(mds, inode, handle, md);
 664                 if (!rc) {
 665                         struct obd_run_ctxt saved;
 666                         push_ctxt(&saved, &mds->mds_ctxt);
 667                         rc = mds_update_last_rcvd(mds, handle, req);
 668                         pop_ctxt(&saved);
 669                 } else {
 670                         req->rq_status = rc;
 671                         RETURN(0);
 672                 }
 673                 /* FIXME: need to return last_rcvd, last_committed */
 674
 675                 /* FIXME: keep rc intact */
 676                 rc = mds_fs_commit(mds, de->d_inode, handle);
 677                 if (rc) {
 678                         req->rq_status = rc;
 679                         RETURN(0);
 680                 }
 681         }
 682
 683         flags = body->flags;
 684         file = dentry_open(de, mnt, flags & ~O_DIRECT);
 685         if (!file || IS_ERR(file)) {
 686                 req->rq_status = -EINVAL;
 687                 OBD_FREE(mfd, sizeof(*mfd));
 688                 RETURN(0);
 689         }
 690
 691         file->private_data = mfd;
 692         mfd->mfd_file = file;
 693         mfd->mfd_clientfd = body->extra;
 694         list_add(&mfd->mfd_list, &med->med_open_head);
 695
 696         body = lustre_msg_buf(req->rq_repmsg, 0);
 697         body->extra = (__u64) (unsigned long)file;
 698         RETURN(0);
 699 }
 700
 701 static int mds_close(struct ptlrpc_request *req)
 702 {
 703         struct dentry *de;
 704         struct mds_body *body;
 705         struct file *file;
 706         struct mds_obd *mds = mds_req2mds(req);
 707         struct vfsmount *mnt;
 708         struct mds_file_data *mfd;
 709         int rc;
 710         ENTRY;
 711
 712         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 713         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK)) {
 714                 CERROR("mds: out of memory\n");
 715                 req->rq_status = -ENOMEM;
 716                 RETURN(0);
 717         }
 718
 719         body = lustre_msg_buf(req->rq_reqmsg, 0);
 720         de = mds_fid2dentry(mds, &body->fid1, &mnt);
 721         if (IS_ERR(de)) {
 722                 req->rq_status = -ENOENT;
 723                 RETURN(0);
 724         }
 725
 726         file = (struct file *)(unsigned long)body->extra;
 727         if (!file->f_dentry)
 728                 LBUG();
 729         mfd = (struct mds_file_data *)file->private_data;
 730         list_del(&mfd->mfd_list);
 731         OBD_FREE(mfd, sizeof(*mfd));
 732
 733         req->rq_status = filp_close(file, 0);
 734         l_dput(de);
 735         mntput(mnt);
 736
 737         RETURN(0);
 738 }
 739
 740 static int mds_readpage(struct ptlrpc_request *req)
 741 {
 742         struct mds_obd *mds = mds_req2mds(req);
 743         struct vfsmount *mnt;
 744         struct dentry *de;
 745         struct file *file;
 746         struct mds_body *body;
 747         struct obd_run_ctxt saved;
 748         int rc, size = sizeof(*body);
 749         ENTRY;
 750
 751         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 752         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK)) {
 753                 CERROR("mds: out of memory\n");
 754                 GOTO(out, rc = -ENOMEM);
 755         }
 756
 757         body = lustre_msg_buf(req->rq_reqmsg, 0);
 758         push_ctxt(&saved, &mds->mds_ctxt);
 759         de = mds_fid2dentry(mds, &body->fid1, &mnt);
 760         if (IS_ERR(de))
 761                 GOTO(out_pop, rc = PTR_ERR(de));
 762
 763         CDEBUG(D_INODE, "ino %ld\n", de->d_inode->i_ino);
 764
 765         file = dentry_open(de, mnt, O_RDONLY | O_LARGEFILE);
 766         /* note: in case of an error, dentry_open puts dentry */
 767         if (IS_ERR(file))
 768                 GOTO(out_pop, rc = PTR_ERR(file));
 769
 770         /* to make this asynchronous make sure that the handling function
 771            doesn't send a reply when this function completes. Instead a
 772            callback function would send the reply */
 773         rc = mds_sendpage(req, file, body->size);
 774
 775         filp_close(file, 0);
 776 out_pop:
 777         pop_ctxt(&saved);
 778 out:
 779         req->rq_status = rc;
 780         RETURN(0);
 781 }
 782
 783 int mds_reint(int offset, struct ptlrpc_request *req)
 784 {
 785         int rc;
 786         struct mds_update_record rec;
 787
 788         rc = mds_update_unpack(req, offset, &rec);
 789         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNPACK)) {
 790                 CERROR("invalid record\n");
 791                 req->rq_status = -EINVAL;
 792                 RETURN(0);
 793         }
 794         /* rc will be used to interrupt a for loop over multiple records */
 795         rc = mds_reint_rec(&rec, offset, req);
 796         return rc;
 797 }
 798
 799 int mds_handle(struct ptlrpc_request *req)
 800 {
 801         int rc;
 802         ENTRY;
 803
 804         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 805         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_HANDLE_UNPACK)) {
 806                 CERROR("lustre_mds: Invalid request\n");
 807                 GOTO(out, rc);
 808         }
 809
 810         if (req->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) {
 811                 CERROR("lustre_mds: wrong packet type sent %d\n",
 812                        req->rq_reqmsg->type);
 813                 GOTO(out, rc = -EINVAL);
 814         }
 815
 816         if (req->rq_reqmsg->opc != MDS_CONNECT && req->rq_export == NULL)
 817                 GOTO(out, rc = -ENOTCONN);
 818
 819         if (strcmp(req->rq_obd->obd_type->typ_name, "mds") != 0)
 820                 GOTO(out, rc = -EINVAL);
 821
 822         switch (req->rq_reqmsg->opc) {
 823         case MDS_CONNECT:
 824                 CDEBUG(D_INODE, "connect\n");
 825                 OBD_FAIL_RETURN(OBD_FAIL_MDS_CONNECT_NET, 0);
 826                 rc = target_handle_connect(req);
 827                 break;
 828
 829         case MDS_DISCONNECT:
 830                 CDEBUG(D_INODE, "disconnect\n");
 831                 OBD_FAIL_RETURN(OBD_FAIL_MDS_DISCONNECT_NET, 0);
 832                 rc = target_handle_disconnect(req);
 833                 goto out;
 834
 835         case MDS_GETSTATUS:
 836                 CDEBUG(D_INODE, "getstatus\n");
 837                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETSTATUS_NET, 0);
 838                 rc = mds_getstatus(req);
 839                 break;
 840
 841         case MDS_GETLOVINFO:
 842                 CDEBUG(D_INODE, "getlovinfo\n");
 843                 rc = mds_getlovinfo(req);
 844                 break;
 845
 846         case MDS_GETATTR:
 847                 CDEBUG(D_INODE, "getattr\n");
 848                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETATTR_NET, 0);
 849                 rc = mds_getattr(0, req);
 850                 break;
 851
 852         case MDS_STATFS:
 853                 CDEBUG(D_INODE, "statfs\n");
 854                 OBD_FAIL_RETURN(OBD_FAIL_MDS_STATFS_NET, 0);
 855                 rc = mds_statfs(req);
 856                 break;
 857
 858         case MDS_READPAGE:
 859                 CDEBUG(D_INODE, "readpage\n");
 860                 OBD_FAIL_RETURN(OBD_FAIL_MDS_READPAGE_NET, 0);
 861                 rc = mds_readpage(req);
 862
 863                 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
 864                         return 0;
 865                 break;
 866
 867         case MDS_REINT: {
 868                 int size = sizeof(struct mds_body);
 869                 CDEBUG(D_INODE, "reint\n");
 870                 OBD_FAIL_RETURN(OBD_FAIL_MDS_REINT_NET, 0);
 871
 872                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
 873                                      &req->rq_repmsg);
 874                 if (rc) {
 875                         rc = req->rq_status = -ENOMEM;
 876                         break;
 877                 }
 878                 rc = mds_reint(0, req);
 879                 OBD_FAIL_RETURN(OBD_FAIL_MDS_REINT_NET_REP, 0);
 880                 break;
 881                 }
 882
 883         case MDS_OPEN:
 884                 CDEBUG(D_INODE, "open\n");
 885                 OBD_FAIL_RETURN(OBD_FAIL_MDS_OPEN_NET, 0);
 886                 rc = mds_open(req);
 887                 break;
 888
 889         case MDS_CLOSE:
 890                 CDEBUG(D_INODE, "close\n");
 891                 OBD_FAIL_RETURN(OBD_FAIL_MDS_CLOSE_NET, 0);
 892                 rc = mds_close(req);
 893                 break;
 894
 895         case LDLM_ENQUEUE:
 896                 CDEBUG(D_INODE, "enqueue\n");
 897                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
 898                 rc = ldlm_handle_enqueue(req);
 899                 if (rc)
 900                         break;
 901                 RETURN(0);
 902
 903         case LDLM_CONVERT:
 904                 CDEBUG(D_INODE, "convert\n");
 905                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
 906                 rc = ldlm_handle_convert(req);
 907                 if (rc)
 908                         break;
 909                 RETURN(0);
 910
 911         case LDLM_CANCEL:
 912                 CDEBUG(D_INODE, "cancel\n");
 913                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
 914                 rc = ldlm_handle_cancel(req);
 915                 if (rc)
 916                         break;
 917                 RETURN(0);
 918         case LDLM_BL_CALLBACK:
 919         case LDLM_CP_CALLBACK:
 920                 CDEBUG(D_INODE, "callback\n");
 921                 CERROR("callbacks should not happen on MDS\n");
 922                 LBUG();
 923                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 924                 break;
 925         default:
 926                 rc = ptlrpc_error(req->rq_svc, req);
 927                 RETURN(rc);
 928         }
 929
 930         EXIT;
 931
 932         if (!rc) {
 933                 struct mds_obd *mds = mds_req2mds(req);
 934                 req->rq_repmsg->last_rcvd = HTON__u64(mds->mds_last_rcvd);
 935                 req->rq_repmsg->last_committed =
 936                         HTON__u64(mds->mds_last_committed);
 937                 CDEBUG(D_INFO, "last_rcvd %Lu, last_committed %Lu, xid %d\n",
 938                        (unsigned long long)mds->mds_last_rcvd,
 939                        (unsigned long long)mds->mds_last_committed,
 940                        cpu_to_le32(req->rq_xid));
 941         }
 942  out:
 943         /* Still not 100% sure whether we should reply with the server
 944          * last_rcvd or that of this client.  I'm not sure it even makes
 945          * a difference on a per-client basis, because last_rcvd is global
 946          * and we are not supposed to allow transactions while in recovery.
 947          */
 948         if (rc) {
 949                 CERROR("mds: processing error %d\n", rc);
 950                 ptlrpc_error(req->rq_svc, req);
 951         } else {
 952                 CDEBUG(D_NET, "sending reply\n");
 953                 ptlrpc_reply(req->rq_svc, req);
 954         }
 955         return 0;
 956 }
 957
 958 /* Update the server data on disk.  This stores the new mount_count and
 959  * also the last_rcvd value to disk.  If we don't have a clean shutdown,
 960  * then the server last_rcvd value may be less than that of the clients.
 961  * This will alert us that we may need to do client recovery.
 962  */
 963 static
 964 int mds_update_server_data(struct mds_obd *mds)
 965 {
 966         struct obd_run_ctxt saved;
 967         struct mds_server_data *msd = mds->mds_server_data;
 968         struct file *filp = mds->mds_rcvd_filp;
 969         loff_t off = 0;
 970         int rc;
 971
 972         msd->msd_last_rcvd = cpu_to_le64(mds->mds_last_rcvd);
 973         msd->msd_mount_count = cpu_to_le64(mds->mds_mount_count);
 974
 975         CDEBUG(D_SUPER, "MDS mount_count is %Lu, last_rcvd is %Lu\n",
 976                (unsigned long long)mds->mds_mount_count,
 977                (unsigned long long)mds->mds_last_rcvd);
 978         push_ctxt(&saved, &mds->mds_ctxt);
 979         rc = lustre_fwrite(filp, (char *)msd, sizeof(*msd), &off);
 980         if (rc != sizeof(*msd)) {
 981                 CERROR("error writing MDS server data: rc = %d\n", rc);
 982                 if (rc > 0)
 983                         RETURN(-EIO);
 984                 RETURN(rc);
 985         }
 986         rc = fsync_dev(filp->f_dentry->d_inode->i_rdev);
 987         pop_ctxt(&saved);
 988         if (rc)
 989                 CERROR("error flushing MDS server data: rc = %d\n", rc);
 990
 991         return 0;
 992 }
 993
 994 /* Do recovery actions for the MDS */
 995 static int mds_recover(struct obd_device *obddev)
 996 {
 997         struct mds_obd *mds = &obddev->u.mds;
 998         int rc;
 999
1000         /* This happens at the end when recovery is complete */
1001         ++mds->mds_mount_count;
1002         rc = mds_update_server_data(mds);
1003
1004         return rc;
1005 }
1006
1007 #define MDS_NUM_THREADS 8
1008 /* mount the file system (secretly) */
1009 static int mds_setup(struct obd_device *obddev, obd_count len, void *buf)
1010 {
1011         int i;
1012         struct obd_ioctl_data* data = buf;
1013         struct mds_obd *mds = &obddev->u.mds;
1014         struct vfsmount *mnt;
1015         int rc = 0;
1016         ENTRY;
1017
1018         MOD_INC_USE_COUNT;
1019 #ifdef CONFIG_DEV_RDONLY
1020         dev_clear_rdonly(2);
1021 #endif
1022         if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2)
1023                 GOTO(err_dec, rc = -EINVAL);
1024
1025         mds->mds_fstype = strdup(data->ioc_inlbuf2);
1026
1027         mnt = do_kern_mount(mds->mds_fstype, 0, data->ioc_inlbuf1, NULL);
1028         if (IS_ERR(mnt)) {
1029                 rc = PTR_ERR(mnt);
1030                 CERROR("do_kern_mount failed: rc = %d\n", rc);
1031                 GOTO(err_kfree, rc);
1032         }
1033
1034         mds->mds_sb = mnt->mnt_root->d_inode->i_sb;
1035         if (!mds->mds_sb)
1036                 GOTO(err_put, rc = -ENODEV);
1037
1038         mds->mds_max_mdsize = sizeof(struct lov_stripe_md);
1039         rc = mds_fs_setup(obddev, mnt);
1040         if (rc) {
1041                 CERROR("MDS filesystem method init failed: rc = %d\n", rc);
1042                 GOTO(err_put, rc);
1043         }
1044
1045         mds->mds_service = ptlrpc_init_svc(64 * 1024, MDS_REQUEST_PORTAL,
1046                                            MDC_REPLY_PORTAL, "self",mds_handle);
1047         if (!mds->mds_service) {
1048                 CERROR("failed to start service\n");
1049                 GOTO(err_fs, rc = -EINVAL);
1050         }
1051
1052         rc = -ENOENT;
1053         obddev->obd_namespace =
1054                 ldlm_namespace_new("mds_server", LDLM_NAMESPACE_SERVER);
1055         if (obddev->obd_namespace == NULL) {
1056                 LBUG();
1057                 mds_cleanup(obddev);
1058                 GOTO(err_svc, rc);
1059         }
1060
1061         for (i = 0; i < MDS_NUM_THREADS; i++) {
1062                 char name[32];
1063                 sprintf(name, "lustre_MDS_%02d", i);
1064                 rc = ptlrpc_start_thread(obddev, mds->mds_service, name);
1065                 if (rc) {
1066                         CERROR("cannot start MDS thread #%d: rc %d\n", i, rc);
1067                         LBUG();
1068                         GOTO(err_thread, rc);
1069                 }
1070         }
1071
1072         rc = mds_recover(obddev);
1073         if (rc)
1074                 GOTO(err_thread, rc);
1075
1076         RETURN(0);
1077
1078 err_thread:
1079         ptlrpc_stop_all_threads(mds->mds_service);
1080 err_svc:
1081         ptlrpc_unregister_service(mds->mds_service);
1082 err_fs:
1083         mds_fs_cleanup(obddev);
1084 err_put:
1085         unlock_kernel();
1086         mntput(mds->mds_vfsmnt);
1087         mds->mds_sb = 0;
1088         lock_kernel();
1089 err_kfree:
1090         kfree(mds->mds_fstype);
1091 err_dec:
1092         MOD_DEC_USE_COUNT;
1093         return rc;
1094 }
1095
1096 static int mds_cleanup(struct obd_device *obddev)
1097 {
1098         struct super_block *sb;
1099         struct mds_obd *mds = &obddev->u.mds;
1100
1101         ENTRY;
1102
1103         if (!list_empty(&obddev->obd_exports)) {
1104                 CERROR("still has exports; forcing cleanup\n");
1105                 class_disconnect_all(obddev);
1106                 if (!list_empty(&obddev->obd_exports)) {
1107                         CERROR("still has exports after forced cleanup?\n");
1108                         RETURN(-EBUSY);
1109                 }
1110         }
1111
1112         ptlrpc_stop_all_threads(mds->mds_service);
1113         ptlrpc_unregister_service(mds->mds_service);
1114
1115         sb = mds->mds_sb;
1116         if (!mds->mds_sb)
1117                 RETURN(0);
1118
1119         mds_update_server_data(mds);
1120
1121         if (mds->mds_rcvd_filp) {
1122                 int rc = filp_close(mds->mds_rcvd_filp, 0);
1123                 mds->mds_rcvd_filp = NULL;
1124
1125                 if (rc)
1126                         CERROR("last_rcvd file won't close, rc=%d\n", rc);
1127         }
1128
1129         unlock_kernel();
1130         mntput(mds->mds_vfsmnt);
1131         mds->mds_sb = 0;
1132         kfree(mds->mds_fstype);
1133
1134         ldlm_namespace_free(obddev->obd_namespace);
1135
1136         lock_kernel();
1137 #ifdef CONFIG_DEV_RDONLY
1138         dev_clear_rdonly(2);
1139 #endif
1140         mds_fs_cleanup(obddev);
1141
1142         MOD_DEC_USE_COUNT;
1143         RETURN(0);
1144 }
1145
1146 static int ldlm_intent_policy(struct ldlm_lock *lock, void *req_cookie,
1147                               ldlm_mode_t mode, void *data)
1148 {
1149         struct ptlrpc_request *req = req_cookie;
1150         int rc = 0;
1151         ENTRY;
1152
1153         if (!req_cookie)
1154                 RETURN(0);
1155
1156         if (req->rq_reqmsg->bufcount > 1) {
1157                 /* an intent needs to be considered */
1158                 struct ldlm_intent *it = lustre_msg_buf(req->rq_reqmsg, 1);
1159                 struct mds_obd *mds= &req->rq_export->exp_obd->u.mds;
1160                 struct mds_body *mds_rep;
1161                 struct ldlm_reply *rep;
1162                 __u64 new_resid[3] = {0, 0, 0}, old_res;
1163                 int bufcount = -1, rc, size[3] = {sizeof(struct ldlm_reply),
1164                                                   sizeof(struct mds_body),
1165                                                   mds->mds_max_mdsize};
1166
1167                 it->opc = NTOH__u64(it->opc);
1168
1169                 LDLM_DEBUG(lock, "intent policy, opc: %s",
1170                            ldlm_it2str(it->opc));
1171
1172                 /* prepare reply */
1173                 switch((long)it->opc) {
1174                 case IT_GETATTR:
1175                         /* Note that in the negative case you may be returning
1176                          * a file and its obdo */
1177                 case IT_CREAT:
1178                 case IT_CREAT|IT_OPEN:
1179                 case IT_LINK:
1180                 case IT_LOOKUP:
1181                 case IT_MKDIR:
1182                 case IT_MKNOD:
1183                 case IT_OPEN:
1184                 case IT_READLINK:
1185                 case IT_RENAME:
1186                 case IT_RMDIR:
1187                 case IT_SETATTR:
1188                 case IT_SYMLINK:
1189                 case IT_UNLINK:
1190                         bufcount = 3;
1191                         break;
1192                 case IT_RENAME2:
1193                         bufcount = 1;
1194                         break;
1195                 default:
1196                         LBUG();
1197                 }
1198
1199                 rc = lustre_pack_msg(bufcount, size, NULL, &req->rq_replen,
1200                                      &req->rq_repmsg);
1201                 if (rc) {
1202                         rc = req->rq_status = -ENOMEM;
1203                         RETURN(rc);
1204                 }
1205
1206                 rep = lustre_msg_buf(req->rq_repmsg, 0);
1207                 rep->lock_policy_res1 = 1;
1208
1209                 /* execute policy */
1210                 switch ((long)it->opc) {
1211                 case IT_CREAT|IT_OPEN:
1212                         rc = mds_reint(2, req);
1213                         if (rc || (req->rq_status != 0 &&
1214                                    req->rq_status != -EEXIST)) {
1215                                 rep->lock_policy_res2 = req->rq_status;
1216                                 RETURN(ELDLM_LOCK_ABORTED);
1217                         }
1218                         break;
1219                 case IT_CREAT:
1220                 case IT_LINK:
1221                 case IT_MKDIR:
1222                 case IT_MKNOD:
1223                 case IT_RENAME2:
1224                 case IT_RMDIR:
1225                 case IT_SYMLINK:
1226                 case IT_UNLINK:
1227                         rc = mds_reint(2, req);
1228                         if (rc || req->rq_status != 0) {
1229                                 rep->lock_policy_res2 = req->rq_status;
1230                                 RETURN(ELDLM_LOCK_ABORTED);
1231                         }
1232                         break;
1233                 case IT_GETATTR:
1234                 case IT_LOOKUP:
1235                 case IT_OPEN:
1236                 case IT_READDIR:
1237                 case IT_READLINK:
1238                 case IT_RENAME:
1239                 case IT_SETATTR:
1240                         rc = mds_getattr_name(2, req);
1241                         /* FIXME: we need to sit down and decide on who should
1242                          * set req->rq_status, who should return negative and
1243                          * positive return values, and what they all mean. */
1244                         if (rc || req->rq_status != 0) {
1245                                 rep->lock_policy_res2 = req->rq_status;
1246                                 RETURN(ELDLM_LOCK_ABORTED);
1247                         }
1248                         break;
1249                 case IT_READDIR|IT_OPEN:
1250                         LBUG();
1251                         break;
1252                 default:
1253                         CERROR("Unhandled intent\n");
1254                         LBUG();
1255                 }
1256
1257                 if (it->opc == IT_UNLINK || it->opc == IT_RMDIR ||
1258                     it->opc == IT_RENAME || it->opc == IT_RENAME2)
1259                         RETURN(ELDLM_LOCK_ABORTED);
1260
1261                 rep->lock_policy_res2 = req->rq_status;
1262                 mds_rep = lustre_msg_buf(req->rq_repmsg, 1);
1263                 new_resid[0] = NTOH__u32(mds_rep->ino);
1264                 if (new_resid[0] == 0)
1265                         LBUG();
1266                 old_res = lock->l_resource->lr_name[0];
1267
1268                 CDEBUG(D_INFO, "remote intent: locking %d instead of"
1269                        "%ld\n", mds_rep->ino, (long)old_res);
1270
1271                 ldlm_lock_change_resource(lock, new_resid);
1272                 if (lock->l_resource == NULL) {
1273                         LBUG();
1274                         RETURN(-ENOMEM);
1275                 }
1276                 LDLM_DEBUG(lock, "intent policy, old res %ld",
1277                            (long)old_res);
1278                 RETURN(ELDLM_LOCK_CHANGED);
1279         } else {
1280                 int size = sizeof(struct ldlm_reply);
1281                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
1282                                      &req->rq_repmsg);
1283                 if (rc) {
1284                         CERROR("out of memory\n");
1285                         LBUG();
1286                         RETURN(-ENOMEM);
1287                 }
1288         }
1289         RETURN(rc);
1290 }
1291
1292
1293 extern int mds_iocontrol(long cmd, struct lustre_handle *conn,
1294                          int len, void *karg, void *uarg);
1295
1296 /* use obd ops to offer management infrastructure */
1297 static struct obd_ops mds_obd_ops = {
1298         o_connect:     mds_connect,
1299         o_disconnect:  mds_disconnect,
1300         o_setup:       mds_setup,
1301         o_cleanup:     mds_cleanup,
1302         o_iocontrol:   mds_iocontrol
1303 };
1304
1305 static int __init mds_init(void)
1306 {
1307         class_register_type(&mds_obd_ops, LUSTRE_MDS_NAME);
1308         ldlm_register_intent(ldlm_intent_policy);
1309         return 0;
1310 }
1311
1312 static void __exit mds_exit(void)
1313 {
1314         ldlm_unregister_intent();
1315         class_unregister_type(LUSTRE_MDS_NAME);
1316 }
1317
1318 MODULE_AUTHOR("Cluster File Systems <info@clusterfs.com>");
1319 MODULE_DESCRIPTION("Lustre Metadata Server (MDS) v0.01");
1320 MODULE_LICENSE("GPL");
1321
1322 module_init(mds_init);
1323 module_exit(mds_exit);