lustre/mds/handler.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  lustre/mds/handler.c
   5  *  Lustre Metadata Server (mds) request handler
   6  *
   7  *  Copyright (c) 2001, 2002 Cluster File Systems, Inc.
   8  *   Author: Peter Braam <braam@clusterfs.com>
   9  *   Author: Andreas Dilger <adilger@clusterfs.com>
  10  *   Author: Phil Schwan <phil@clusterfs.com>
  11  *
  12  *   This file is part of Lustre, http://www.lustre.org.
  13  *
  14  *   Lustre is free software; you can redistribute it and/or
  15  *   modify it under the terms of version 2 of the GNU General Public
  16  *   License as published by the Free Software Foundation.
  17  *
  18  *   Lustre is distributed in the hope that it will be useful,
  19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *   GNU General Public License for more details.
  22  *
  23  *   You should have received a copy of the GNU General Public License
  24  *   along with Lustre; if not, write to the Free Software
  25  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #define EXPORT_SYMTAB
  29 #define DEBUG_SUBSYSTEM S_MDS
  30
  31 #include <linux/module.h>
  32 #include <linux/lustre_mds.h>
  33 #include <linux/lustre_dlm.h>
  34 #include <linux/init.h>
  35 #include <linux/obd_class.h>
  36 #include <linux/random.h>
  37 #include <linux/locks.h>
  38 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
  39 #include <linux/buffer_head.h>
  40 #endif
  41
  42 static kmem_cache_t *mds_file_cache;
  43
  44 extern int mds_get_lovtgts(struct mds_obd *obd, int tgt_count,
  45                            obd_uuid_t *uuidarray);
  46 extern int mds_get_lovdesc(struct mds_obd  *obd, struct lov_desc *desc);
  47 extern int mds_update_last_rcvd(struct mds_obd *mds, void *handle,
  48                                 struct ptlrpc_request *req);
  49 static int mds_cleanup(struct obd_device * obddev);
  50
  51 inline struct mds_obd *mds_req2mds(struct ptlrpc_request *req)
  52 {
  53         return &req->rq_export->exp_obd->u.mds;
  54 }
  55
  56 static int mds_bulk_timeout(void *data)
  57 {
  58         struct ptlrpc_bulk_desc *desc = data;
  59
  60         ENTRY;
  61         CERROR("(not yet) starting recovery of client %p\n", desc->bd_client);
  62         RETURN(1);
  63 }
  64
  65 /* Assumes caller has already pushed into the kernel filesystem context */
  66 static int mds_sendpage(struct ptlrpc_request *req, struct file *file,
  67                         __u64 offset)
  68 {
  69         int rc = 0;
  70         struct mds_obd *mds = mds_req2mds(req);
  71         struct ptlrpc_bulk_desc *desc;
  72         struct ptlrpc_bulk_page *bulk;
  73         struct l_wait_info lwi;
  74         char *buf;
  75         ENTRY;
  76
  77         desc = ptlrpc_prep_bulk(req->rq_connection);
  78         if (desc == NULL)
  79                 GOTO(out, rc = -ENOMEM);
  80
  81         bulk = ptlrpc_prep_bulk_page(desc);
  82         if (bulk == NULL)
  83                 GOTO(cleanup_bulk, rc = -ENOMEM);
  84
  85         OBD_ALLOC(buf, PAGE_SIZE);
  86         if (buf == NULL)
  87                 GOTO(cleanup_bulk, rc = -ENOMEM);
  88
  89         rc = mds_fs_readpage(mds, file, buf, PAGE_SIZE, (loff_t *)&offset);
  90
  91         if (rc != PAGE_SIZE)
  92                 GOTO(cleanup_buf, rc = -EIO);
  93
  94         bulk->bp_xid = req->rq_xid;
  95         bulk->bp_buf = buf;
  96         bulk->bp_buflen = PAGE_SIZE;
  97         desc->bd_portal = MDS_BULK_PORTAL;
  98
  99         rc = ptlrpc_send_bulk(desc);
 100         if (rc)
 101                 GOTO(cleanup_buf, rc);
 102
 103         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
 104                 CERROR("obd_fail_loc=%x, fail operation rc=%d\n",
 105                        OBD_FAIL_MDS_SENDPAGE, rc);
 106                 ptlrpc_abort_bulk(desc);
 107                 GOTO(cleanup_buf, rc);
 108         }
 109
 110         lwi = LWI_TIMEOUT(obd_timeout * HZ, mds_bulk_timeout, desc);
 111         rc = l_wait_event(desc->bd_waitq, desc->bd_flags & PTL_BULK_FL_SENT, &lwi);
 112         if (rc) {
 113                 if (rc != -ETIMEDOUT)
 114                         LBUG();
 115                 GOTO(cleanup_buf, rc);
 116         }
 117
 118         EXIT;
 119  cleanup_buf:
 120         OBD_FREE(buf, PAGE_SIZE);
 121  cleanup_bulk:
 122         ptlrpc_free_bulk(desc);
 123  out:
 124         return rc;
 125 }
 126
 127 /*
 128  * Look up a named entry in a directory, and get an LDLM lock on it.
 129  * 'dir' is a inode for which an LDLM lock has already been taken.
 130  *
 131  * If we do not need an exclusive or write lock on this entry (e.g.
 132  * a read lock for attribute lookup only) then we do not hold the
 133  * directory on return.  It is up to the caller to know what type
 134  * of lock it is getting, and clean up appropriately.
 135  */
 136 struct dentry *mds_name2locked_dentry(struct obd_device *obd,
 137                                       struct dentry *dir, struct vfsmount **mnt,
 138                                       char *name, int namelen, int lock_mode,
 139                                       struct lustre_handle *lockh,
 140                                       int dir_lock_mode)
 141 {
 142         struct dentry *dchild;
 143         int flags = 0, rc;
 144         __u64 res_id[3] = {0};
 145         ENTRY;
 146
 147         down(&dir->d_inode->i_sem);
 148         dchild = lookup_one_len(name, dir, namelen);
 149         if (IS_ERR(dchild)) {
 150                 CERROR("child lookup error %ld\n", PTR_ERR(dchild));
 151                 up(&dir->d_inode->i_sem);
 152                 LBUG();
 153                 RETURN(dchild);
 154         }
 155         if (dir_lock_mode != LCK_EX && dir_lock_mode != LCK_PW) {
 156                 up(&dir->d_inode->i_sem);
 157                 ldlm_lock_decref(lockh, dir_lock_mode);
 158         }
 159
 160         if (lock_mode == 0 || !dchild->d_inode)
 161                 RETURN(dchild);
 162
 163         res_id[0] = dchild->d_inode->i_ino;
 164         res_id[1] = dchild->d_inode->i_generation;
 165         rc = ldlm_match_or_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 166                                    res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 167                                    &flags, ldlm_completion_ast,
 168                                    mds_blocking_ast, NULL, 0, lockh);
 169         if (rc != ELDLM_OK) {
 170                 l_dput(dchild);
 171                 up(&dir->d_inode->i_sem);
 172                 RETURN(ERR_PTR(-ENOLCK)); /* XXX translate ldlm code */
 173         }
 174
 175         RETURN(dchild);
 176 }
 177
 178 struct dentry *mds_fid2locked_dentry(struct obd_device *obd, struct ll_fid *fid,
 179                                      struct vfsmount **mnt, int lock_mode,
 180                                      struct lustre_handle *lockh)
 181 {
 182         struct mds_obd *mds = &obd->u.mds;
 183         struct dentry *de = mds_fid2dentry(mds, fid, mnt), *retval = de;
 184         int flags = 0, rc;
 185         __u64 res_id[3] = {0};
 186         ENTRY;
 187
 188         if (IS_ERR(de))
 189                 RETURN(de);
 190
 191         res_id[0] = de->d_inode->i_ino;
 192         res_id[1] = de->d_inode->i_generation;
 193         rc = ldlm_match_or_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 194                                    res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 195                                    &flags, ldlm_completion_ast,
 196                                    mds_blocking_ast, NULL, 0, lockh);
 197         if (rc != ELDLM_OK) {
 198                 l_dput(de);
 199                 retval = ERR_PTR(-ENOLCK); /* XXX translate ldlm code */
 200         }
 201
 202         RETURN(retval);
 203 }
 204
 205 #ifndef DCACHE_DISCONNECTED
 206 #define DCACHE_DISCONNECTED DCACHE_NFSD_DISCONNECTED
 207 #endif
 208
 209 /* Look up an entry by inode number. */
 210 struct dentry *mds_fid2dentry(struct mds_obd *mds, struct ll_fid *fid,
 211                               struct vfsmount **mnt)
 212 {
 213         /* stolen from NFS */
 214         struct super_block *sb = mds->mds_sb;
 215         unsigned long ino = fid->id;
 216         __u32 generation = fid->generation;
 217         struct inode *inode;
 218         struct list_head *lp;
 219         struct dentry *result;
 220
 221         if (ino == 0)
 222                 RETURN(ERR_PTR(-ESTALE));
 223
 224         inode = iget(sb, ino);
 225         if (inode == NULL)
 226                 RETURN(ERR_PTR(-ENOMEM));
 227
 228         CDEBUG(D_DENTRY, "--> mds_fid2dentry: sb %p\n", inode->i_sb);
 229
 230         if (is_bad_inode(inode) ||
 231             (generation && inode->i_generation != generation)) {
 232                 /* we didn't find the right inode.. */
 233                 CERROR("bad inode %lu, link: %d ct: %d or version  %u/%u\n",
 234                        inode->i_ino, inode->i_nlink,
 235                        atomic_read(&inode->i_count), inode->i_generation,
 236                        generation);
 237                 LBUG();
 238                 iput(inode);
 239                 RETURN(ERR_PTR(-ESTALE));
 240         }
 241
 242         /* now to find a dentry. If possible, get a well-connected one */
 243         if (mnt)
 244                 *mnt = mds->mds_vfsmnt;
 245         spin_lock(&dcache_lock);
 246         list_for_each(lp, &inode->i_dentry) {
 247                 result = list_entry(lp, struct dentry, d_alias);
 248                 if (!(result->d_flags & DCACHE_DISCONNECTED)) {
 249                         dget_locked(result);
 250                         result->d_vfs_flags |= DCACHE_REFERENCED;
 251                         spin_unlock(&dcache_lock);
 252                         iput(inode);
 253                         if (mnt)
 254                                 mntget(*mnt);
 255                         return result;
 256                 }
 257         }
 258         spin_unlock(&dcache_lock);
 259         result = d_alloc_root(inode);
 260         if (result == NULL) {
 261                 iput(inode);
 262                 return ERR_PTR(-ENOMEM);
 263         }
 264         if (mnt)
 265                 mntget(*mnt);
 266         result->d_flags |= DCACHE_DISCONNECTED;
 267         return result;
 268 }
 269
 270 /* Establish a connection to the MDS.
 271  *
 272  * This will set up an export structure for the client to hold state data
 273  * about that client, like open files, the last operation number it did
 274  * on the server, etc.
 275  */
 276 static int mds_connect(struct lustre_handle *conn, struct obd_device *obd,
 277                        obd_uuid_t cluuid, struct recovd_obd *recovd,
 278                        ptlrpc_recovery_cb_t recover)
 279 {
 280         struct obd_export *exp;
 281         struct mds_export_data *med;
 282         struct mds_client_data *mcd;
 283         struct list_head *p;
 284         int rc;
 285         ENTRY;
 286
 287         if (!conn || !obd || !cluuid)
 288                 RETURN(-EINVAL);
 289
 290         MOD_INC_USE_COUNT;
 291
 292         spin_lock(&obd->obd_dev_lock);
 293         list_for_each(p, &obd->obd_exports) {
 294                 exp = list_entry(p, struct obd_export, exp_obd_chain);
 295                 mcd = exp->exp_mds_data.med_mcd;
 296                 if (!memcmp(cluuid, mcd->mcd_uuid, sizeof(mcd->mcd_uuid))) {
 297                         LASSERT(exp->exp_obd == obd);
 298
 299                         if (!list_empty(&exp->exp_conn_chain)) {
 300                                 CERROR("existing uuid/export, list not empty!\n");
 301                                 spin_unlock(&obd->obd_dev_lock);
 302                                 /* XXX should we MOD_DEC_USE_COUNT; here? */
 303                                 RETURN(-EALREADY);
 304                         }
 305                         conn->addr = (__u64) (unsigned long)exp;
 306                         conn->cookie = exp->exp_cookie;
 307                         spin_unlock(&obd->obd_dev_lock);
 308                         CDEBUG(D_INFO, "existing export for UUID '%s' at %p\n",
 309                                cluuid, exp);
 310                         CDEBUG(D_IOCTL,"connect: addr %Lx cookie %Lx\n",
 311                                (long long)conn->addr, (long long)conn->cookie);
 312                         MOD_DEC_USE_COUNT;
 313                         RETURN(0);
 314                 }
 315         }
 316         spin_unlock(&obd->obd_dev_lock);
 317         /* XXX There is a small race between checking the list and adding a
 318          * new connection for the same UUID, but the real threat (list
 319          * corruption when multiple different clients connect) is solved.
 320          */
 321         rc = class_connect(conn, obd, cluuid);
 322         if (rc)
 323                 GOTO(out_dec, rc);
 324         exp = class_conn2export(conn);
 325         LASSERT(exp);
 326         med = &exp->exp_mds_data;
 327
 328         OBD_ALLOC(mcd, sizeof(*mcd));
 329         if (!mcd) {
 330                 CERROR("mds: out of memory for client data\n");
 331                 GOTO(out_export, rc = -ENOMEM);
 332         }
 333
 334         memcpy(mcd->mcd_uuid, cluuid, sizeof(mcd->mcd_uuid));
 335         med->med_mcd = mcd;
 336
 337         INIT_LIST_HEAD(&med->med_open_head);
 338         spin_lock_init(&med->med_open_lock);
 339
 340         rc = mds_client_add(med, -1);
 341         if (rc)
 342                 GOTO(out_mdc, rc);
 343
 344         RETURN(0);
 345
 346 out_mdc:
 347         OBD_FREE(mcd, sizeof(*mcd));
 348 out_export:
 349         class_disconnect(conn);
 350 out_dec:
 351         MOD_DEC_USE_COUNT;
 352
 353         return rc;
 354 }
 355
 356 /* Call with med->med_open_lock held, please. */
 357 inline int mds_close_mfd(struct mds_file_data *mfd, struct mds_export_data *med)
 358 {
 359         struct file *file = mfd->mfd_file;
 360         LASSERT(file->private_data == mfd);
 361
 362         list_del(&mfd->mfd_list);
 363         mfd->mfd_servercookie = DEAD_HANDLE_MAGIC;
 364         kmem_cache_free(mds_file_cache, mfd);
 365
 366         return filp_close(file, 0);
 367 }
 368
 369 static int mds_disconnect(struct lustre_handle *conn)
 370 {
 371         struct obd_export *export = class_conn2export(conn);
 372         struct list_head *tmp, *n;
 373         struct mds_export_data *med = &export->exp_mds_data;
 374         int rc;
 375         ENTRY;
 376
 377         /*
 378          * Close any open files.
 379          */
 380         spin_lock(&med->med_open_lock);
 381         list_for_each_safe(tmp, n, &med->med_open_head) {
 382                 struct mds_file_data *mfd =
 383                         list_entry(tmp, struct mds_file_data, mfd_list);
 384                 rc = mds_close_mfd(mfd, med);
 385                 if (rc) {
 386                         /* XXX better diagnostics, with file path and stuff */
 387                         CDEBUG(D_INODE, "Error %d closing mfd %p\n", rc, mfd);
 388                 }
 389         }
 390         spin_unlock(&med->med_open_lock);
 391
 392         ldlm_cancel_locks_for_export(export);
 393         mds_client_free(export);
 394
 395         rc = class_disconnect(conn);
 396         if (!rc)
 397                 MOD_DEC_USE_COUNT;
 398
 399         RETURN(rc);
 400 }
 401
 402 /*
 403  * XXX This is NOT guaranteed to flush all transactions to disk (even though
 404  *     it is equivalent to calling sync()) because it only _starts_ the flush
 405  *     and does not wait for completion.  It's better than nothing though.
 406  *     What we really want is a mild form of fsync_dev_lockfs(), but it is
 407  *     non-standard, or enabling do_sync_supers in ext3, just for this call.
 408  */
 409 static void mds_fsync_super(struct super_block *sb)
 410 {
 411         lock_kernel();
 412         lock_super(sb);
 413         if (sb->s_dirt && sb->s_op && sb->s_op->write_super)
 414                 sb->s_op->write_super(sb);
 415         unlock_super(sb);
 416         unlock_kernel();
 417 }
 418
 419 static int mds_getstatus(struct ptlrpc_request *req)
 420 {
 421         struct mds_obd *mds = mds_req2mds(req);
 422         struct mds_body *body;
 423         int rc, size = sizeof(*body);
 424         ENTRY;
 425
 426         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 427         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK)) {
 428                 CERROR("mds: out of memory for message: size=%d\n", size);
 429                 req->rq_status = -ENOMEM;
 430                 RETURN(0);
 431         }
 432
 433         /* Flush any outstanding transactions to disk so the client will
 434          * get the latest last_committed value and can drop their local
 435          * requests if they have any.  This would be fsync_super() if it
 436          * was exported.
 437          */
 438         mds_fsync_super(mds->mds_sb);
 439
 440         body = lustre_msg_buf(req->rq_repmsg, 0);
 441         memcpy(&body->fid1, &mds->mds_rootfid, sizeof(body->fid1));
 442
 443         /* the last_committed and last_xid fields are filled in for all
 444          * replies already - no need to do so here also.
 445          */
 446         RETURN(0);
 447 }
 448
 449 static int mds_getlovinfo(struct ptlrpc_request *req)
 450 {
 451         struct mds_obd *mds = mds_req2mds(req);
 452         struct mds_status_req *streq;
 453         struct lov_desc *desc;
 454         int tgt_count;
 455         int rc, size[2] = {sizeof(*desc)};
 456         ENTRY;
 457
 458         streq = lustre_msg_buf(req->rq_reqmsg, 0);
 459         streq->flags = NTOH__u32(streq->flags);
 460         streq->repbuf = NTOH__u32(streq->repbuf);
 461         size[1] = streq->repbuf;
 462
 463         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 464         if (rc) {
 465                 CERROR("mds: out of memory for message: size=%d\n", size[1]);
 466                 req->rq_status = -ENOMEM;
 467                 RETURN(0);
 468         }
 469
 470         desc = lustre_msg_buf(req->rq_repmsg, 0);
 471         rc = mds_get_lovdesc(mds, desc);
 472         if (rc) {
 473                 CERROR("mds_get_lovdesc error %d", rc);
 474                 req->rq_status = rc;
 475                 RETURN(0);
 476         }
 477
 478         tgt_count = le32_to_cpu(desc->ld_tgt_count);
 479         if (tgt_count * sizeof(obd_uuid_t) > streq->repbuf) {
 480                 CERROR("too many targets, enlarge client buffers\n");
 481                 req->rq_status = -ENOSPC;
 482                 RETURN(0);
 483         }
 484
 485         mds->mds_max_mdsize = sizeof(struct lov_mds_md) +
 486                 tgt_count * sizeof(struct lov_object_id);
 487         rc = mds_get_lovtgts(mds, tgt_count,
 488                              lustre_msg_buf(req->rq_repmsg, 1));
 489         if (rc) {
 490                 CERROR("get_lovtgts error %d\n", rc);
 491                 req->rq_status = rc;
 492                 RETURN(0);
 493         }
 494         RETURN(0);
 495 }
 496
 497 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 498                      void *data, __u32 data_len, int flag)
 499 {
 500         int do_ast;
 501         ENTRY;
 502
 503         if (flag == LDLM_CB_CANCELING) {
 504                 /* Don't need to do anything here. */
 505                 RETURN(0);
 506         }
 507
 508         /* XXX layering violation!  -phil */
 509         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 510         lock->l_flags |= LDLM_FL_CBPENDING;
 511         do_ast = (!lock->l_readers && !lock->l_writers);
 512         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 513
 514         if (do_ast) {
 515                 struct lustre_handle lockh;
 516                 int rc;
 517
 518                 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
 519                 ldlm_lock2handle(lock, &lockh);
 520                 rc = ldlm_cli_cancel(&lockh);
 521                 if (rc < 0)
 522                         CERROR("ldlm_cli_cancel: %d\n", rc);
 523         } else
 524                 LDLM_DEBUG(lock, "Lock still has references, will be"
 525                            "cancelled later");
 526         RETURN(0);
 527 }
 528
 529 static int mds_getattr_internal(struct mds_obd *mds, struct dentry *dentry,
 530                                 struct ptlrpc_request *req,
 531                                 struct mds_body *reqbody, int reply_off)
 532 {
 533         struct mds_body *body;
 534         struct inode *inode = dentry->d_inode;
 535         int rc;
 536         ENTRY;
 537
 538         if (inode == NULL)
 539                 RETURN(-ENOENT);
 540
 541         body = lustre_msg_buf(req->rq_repmsg, reply_off);
 542
 543         mds_pack_inode2fid(&body->fid1, inode);
 544         mds_pack_inode2body(body, inode);
 545
 546         if (S_ISREG(inode->i_mode)) {
 547                 struct lov_mds_md *lmm;
 548
 549                 lmm = lustre_msg_buf(req->rq_repmsg, reply_off + 1);
 550                 lmm->lmm_easize = mds->mds_max_mdsize;
 551                 rc = mds_fs_get_md(mds, inode, lmm);
 552
 553                 if (rc < 0) {
 554                         if (rc == -ENODATA)
 555                                 RETURN(0);
 556                         CERROR("mds_fs_get_md failed: %d\n", rc);
 557                         RETURN(rc);
 558                 }
 559                 body->valid |= OBD_MD_FLEASIZE;
 560         } else if (S_ISLNK(inode->i_mode) && reqbody->valid & OBD_MD_LINKNAME) {
 561                 char *symname = lustre_msg_buf(req->rq_repmsg, reply_off + 1);
 562                 int len = req->rq_repmsg->buflens[reply_off + 1];
 563
 564                 rc = inode->i_op->readlink(dentry, symname, len);
 565                 if (rc < 0) {
 566                         CERROR("readlink failed: %d\n", rc);
 567                         RETURN(rc);
 568                 } else
 569                         CDEBUG(D_INODE, "read symlink dest %s\n", symname);
 570
 571                 body->valid |= OBD_MD_LINKNAME;
 572         }
 573         RETURN(0);
 574 }
 575
 576 static int mds_getattr_name(int offset, struct ptlrpc_request *req)
 577 {
 578         struct mds_obd *mds = mds_req2mds(req);
 579         struct obd_device *obd = req->rq_export->exp_obd;
 580         struct obd_run_ctxt saved;
 581         struct mds_body *body;
 582         struct dentry *de = NULL, *dchild = NULL;
 583         struct inode *dir;
 584         struct lustre_handle lockh;
 585         char *name;
 586         int namelen, flags = 0, lock_mode, rc = 0;
 587         struct obd_ucred uc;
 588         __u64 res_id[3] = {0, 0, 0};
 589         ENTRY;
 590
 591         LASSERT(!strcmp(req->rq_export->exp_obd->obd_type->typ_name, "mds"));
 592
 593         if (req->rq_reqmsg->bufcount <= offset + 1) {
 594                 LBUG();
 595                 GOTO(out_pre_de, rc = -EINVAL);
 596         }
 597
 598         body = lustre_msg_buf(req->rq_reqmsg, offset);
 599         name = lustre_msg_buf(req->rq_reqmsg, offset + 1);
 600         namelen = req->rq_reqmsg->buflens[offset + 1];
 601         /* requests were at offset 2, replies go back at 1 */
 602         if (offset)
 603                 offset = 1;
 604
 605         uc.ouc_fsuid = body->fsuid;
 606         uc.ouc_fsgid = body->fsgid;
 607         push_ctxt(&saved, &mds->mds_ctxt, &uc);
 608         de = mds_fid2dentry(mds, &body->fid1, NULL);
 609         if (IS_ERR(de)) {
 610                 LBUG();
 611                 GOTO(out_pre_de, rc = -ESTALE);
 612         }
 613
 614         dir = de->d_inode;
 615         CDEBUG(D_INODE, "parent ino %ld, name %*s\n", dir->i_ino,namelen,name);
 616
 617         lock_mode = (req->rq_reqmsg->opc == MDS_REINT) ? LCK_CW : LCK_PW;
 618         res_id[0] = dir->i_ino;
 619         res_id[1] = dir->i_generation;
 620
 621         rc = ldlm_lock_match(obd->obd_namespace, res_id, LDLM_PLAIN,
 622                              NULL, 0, lock_mode, &lockh);
 623         if (rc == 0) {
 624                 LDLM_DEBUG_NOLOCK("enqueue res "LPU64, res_id[0]);
 625                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 626                                       res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 627                                       &flags, ldlm_completion_ast,
 628                                       mds_blocking_ast, NULL, 0, &lockh);
 629                 if (rc != ELDLM_OK) {
 630                         CERROR("lock enqueue: err: %d\n", rc);
 631                         GOTO(out_create_de, rc = -EIO);
 632                 }
 633         }
 634         ldlm_lock_dump((void *)(unsigned long)lockh.addr);
 635
 636         down(&dir->i_sem);
 637         dchild = lookup_one_len(name, de, namelen - 1);
 638         if (IS_ERR(dchild)) {
 639                 CDEBUG(D_INODE, "child lookup error %ld\n", PTR_ERR(dchild));
 640                 up(&dir->i_sem);
 641                 LBUG();
 642                 GOTO(out_create_dchild, rc = -ESTALE);
 643         }
 644
 645         rc = mds_getattr_internal(mds, dchild, req, body, offset);
 646
 647         EXIT;
 648 out_create_dchild:
 649         l_dput(dchild);
 650         up(&dir->i_sem);
 651         ldlm_lock_decref(&lockh, lock_mode);
 652 out_create_de:
 653         l_dput(de);
 654 out_pre_de:
 655         req->rq_status = rc;
 656         pop_ctxt(&saved);
 657         return 0;
 658 }
 659
 660 static int mds_getattr(int offset, struct ptlrpc_request *req)
 661 {
 662         struct mds_obd *mds = mds_req2mds(req);
 663         struct obd_run_ctxt saved;
 664         struct dentry *de;
 665         struct inode *inode;
 666         struct mds_body *body;
 667         struct obd_ucred uc;
 668         int rc = 0, size[2] = {sizeof(*body)}, bufcount = 1;
 669         ENTRY;
 670
 671         body = lustre_msg_buf(req->rq_reqmsg, offset);
 672         uc.ouc_fsuid = body->fsuid;
 673         uc.ouc_fsgid = body->fsgid;
 674         push_ctxt(&saved, &mds->mds_ctxt, &uc);
 675         de = mds_fid2dentry(mds, &body->fid1, NULL);
 676         if (IS_ERR(de)) {
 677                 rc = req->rq_status = -ENOENT;
 678                 GOTO(out_pop, PTR_ERR(de));
 679         }
 680
 681         inode = de->d_inode;
 682         if (S_ISREG(body->fid1.f_type)) {
 683                 bufcount = 2;
 684                 size[1] = mds->mds_max_mdsize;
 685         } else if (body->valid & OBD_MD_LINKNAME) {
 686                 bufcount = 2;
 687                 size[1] = MIN(inode->i_size + 1, body->size);
 688                 CDEBUG(D_INODE, "symlink size: %d, reply space: %d\n",
 689                        inode->i_size + 1, body->size);
 690         }
 691
 692         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK)) {
 693                 CERROR("failed GETATTR_PACK test\n");
 694                 req->rq_status = -ENOMEM;
 695                 GOTO(out, rc = -ENOMEM);
 696         }
 697
 698         rc = lustre_pack_msg(bufcount, size, NULL, &req->rq_replen,
 699                              &req->rq_repmsg);
 700         if (rc) {
 701                 CERROR("out of memory or FAIL_MDS_GETATTR_PACK\n");
 702                 req->rq_status = rc;
 703                 GOTO(out, rc);
 704         }
 705
 706         req->rq_status = mds_getattr_internal(mds, de, req, body, 0);
 707
 708 out:
 709         l_dput(de);
 710 out_pop:
 711         pop_ctxt(&saved);
 712         RETURN(rc);
 713 }
 714
 715 static int mds_statfs(struct ptlrpc_request *req)
 716 {
 717         struct mds_obd *mds = mds_req2mds(req);
 718         struct obd_statfs *osfs;
 719         struct statfs sfs;
 720         int rc, size = sizeof(*osfs);
 721         ENTRY;
 722
 723         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
 724                              &req->rq_repmsg);
 725         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK)) {
 726                 CERROR("mds: statfs lustre_pack_msg failed: rc = %d\n", rc);
 727                 GOTO(out, rc);
 728         }
 729
 730         rc = vfs_statfs(mds->mds_sb, &sfs);
 731         if (rc) {
 732                 CERROR("mds: statfs failed: rc %d\n", rc);
 733                 GOTO(out, rc);
 734         }
 735         osfs = lustre_msg_buf(req->rq_repmsg, 0);
 736         memset(osfs, 0, size);
 737         statfs_pack(osfs, &sfs);
 738         obd_statfs_pack(osfs, osfs);
 739
 740 out:
 741         req->rq_status = rc;
 742         RETURN(0);
 743 }
 744
 745 static struct mds_file_data *mds_handle2mfd(struct lustre_handle *handle)
 746 {
 747         struct mds_file_data *mfd = NULL;
 748
 749         if (!handle || !handle->addr)
 750                 RETURN(NULL);
 751
 752         mfd = (struct mds_file_data *)(unsigned long)(handle->addr);
 753         if (!kmem_cache_validate(mds_file_cache, mfd))
 754                 RETURN(NULL);
 755
 756         if (mfd->mfd_servercookie != handle->cookie)
 757                 RETURN(NULL);
 758
 759         return mfd;
 760 }
 761
 762 static int mds_store_ea(struct mds_obd *mds, struct ptlrpc_request *req,
 763                         struct mds_body *body, struct dentry *de,
 764                         struct lov_mds_md *lmm)
 765 {
 766         struct obd_run_ctxt saved;
 767         struct obd_ucred uc;
 768         void *handle;
 769         int rc, rc2;
 770
 771         uc.ouc_fsuid = body->fsuid;
 772         uc.ouc_fsgid = body->fsgid;
 773         push_ctxt(&saved, &mds->mds_ctxt, &uc);
 774         handle = mds_fs_start(mds, de->d_inode, MDS_FSOP_SETATTR);
 775         if (!handle)
 776                 GOTO(out_ea, rc = -ENOMEM);
 777
 778         rc = mds_fs_set_md(mds, de->d_inode, handle, lmm);
 779         if (!rc)
 780                 rc = mds_update_last_rcvd(mds, handle, req);
 781
 782         rc2 = mds_fs_commit(mds, de->d_inode, handle);
 783         if (rc2 && !rc)
 784                 rc = rc2;
 785 out_ea:
 786         pop_ctxt(&saved);
 787
 788         return rc;
 789 }
 790
 791 static int mds_open(struct ptlrpc_request *req)
 792 {
 793         struct mds_obd *mds = mds_req2mds(req);
 794         struct mds_body *body;
 795         struct mds_export_data *med;
 796         struct mds_file_data *mfd;
 797         struct dentry *de;
 798         struct file *file;
 799         struct vfsmount *mnt;
 800         __u32 flags;
 801         struct list_head *tmp;
 802         int rc, size = sizeof(*body);
 803         ENTRY;
 804
 805         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK)) {
 806                 CERROR("test case OBD_FAIL_MDS_OPEN_PACK\n");
 807                 req->rq_status = -ENOMEM;
 808                 RETURN(-ENOMEM);
 809         }
 810
 811         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 812         if (rc) {
 813                 CERROR("mds: pack error: rc = %d\n", rc);
 814                 req->rq_status = rc;
 815                 RETURN(rc);
 816         }
 817
 818         body = lustre_msg_buf(req->rq_reqmsg, 0);
 819
 820         /* was this animal open already and the client lost the reply? */
 821         /* XXX need some way to detect a reopen, to avoid locked list walks */
 822         med = &req->rq_export->exp_mds_data;
 823         spin_lock(&med->med_open_lock);
 824         list_for_each(tmp, &med->med_open_head) {
 825                 mfd = list_entry(tmp, typeof(*mfd), mfd_list);
 826                 if (!memcmp(&mfd->mfd_clienthandle, &body->handle,
 827                             sizeof(mfd->mfd_clienthandle)) &&
 828                     body->fid1.id == mfd->mfd_file->f_dentry->d_inode->i_ino) {
 829                         de = mfd->mfd_file->f_dentry;
 830                         spin_unlock(&med->med_open_lock);
 831                         CERROR("Re opening "LPD64"\n", body->fid1.id);
 832                         GOTO(out_pack, rc = 0);
 833                 }
 834         }
 835         spin_unlock(&med->med_open_lock);
 836
 837         mfd = kmem_cache_alloc(mds_file_cache, GFP_KERNEL);
 838         if (!mfd) {
 839                 CERROR("mds: out of memory\n");
 840                 req->rq_status = -ENOMEM;
 841                 RETURN(0);
 842         }
 843
 844         de = mds_fid2dentry(mds, &body->fid1, &mnt);
 845         if (IS_ERR(de))
 846                 GOTO(out_free, rc = PTR_ERR(de));
 847
 848         /* check if this inode has seen a delayed object creation */
 849         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MDS_OPEN_HAS_EA) {
 850                 struct lov_mds_md *lmm = lustre_msg_buf(req->rq_reqmsg, 1);
 851
 852                 rc = mds_store_ea(mds, req, body, de, lmm);
 853                 if (rc) {
 854                         l_dput(de);
 855                         mntput(mnt);
 856                         GOTO(out_free, rc);
 857                 }
 858         }
 859
 860         flags = body->flags;
 861         /* dentry_open does a dput(de) and mntput(mnt) on error */
 862         file = dentry_open(de, mnt, flags & ~O_DIRECT);
 863         if (IS_ERR(file)) {
 864                 rc = PTR_ERR(file);
 865                 GOTO(out_free, 0);
 866         }
 867
 868         file->private_data = mfd;
 869         mfd->mfd_file = file;
 870         memcpy(&mfd->mfd_clienthandle, &body->handle, sizeof(body->handle));
 871         get_random_bytes(&mfd->mfd_servercookie, sizeof(mfd->mfd_servercookie));
 872         spin_lock(&med->med_open_lock);
 873         list_add(&mfd->mfd_list, &med->med_open_head);
 874         spin_unlock(&med->med_open_lock);
 875
 876 out_pack:
 877         body = lustre_msg_buf(req->rq_repmsg, 0);
 878         mds_pack_inode2fid(&body->fid1, de->d_inode);
 879         mds_pack_inode2body(body, de->d_inode);
 880         body->handle.addr = (__u64)(unsigned long)mfd;
 881         body->handle.cookie = mfd->mfd_servercookie;
 882         CDEBUG(D_INODE, "llite file "LPX64": addr %p, cookie "LPX64"\n",
 883                mfd->mfd_clienthandle.addr, mfd, mfd->mfd_servercookie);
 884         RETURN(0);
 885
 886 out_free:
 887         mfd->mfd_servercookie = DEAD_HANDLE_MAGIC;
 888         kmem_cache_free(mds_file_cache, mfd);
 889         req->rq_status = rc;
 890         RETURN(0);
 891 }
 892
 893 static int mds_close(struct ptlrpc_request *req)
 894 {
 895         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 896         struct mds_body *body;
 897         struct mds_file_data *mfd;
 898         int rc;
 899         ENTRY;
 900
 901         body = lustre_msg_buf(req->rq_reqmsg, 0);
 902
 903         mfd = mds_handle2mfd(&body->handle);
 904         if (!mfd) {
 905                 CERROR("no handle for file close "LPD64
 906                        ": addr "LPX64", cookie "LPX64"\n",
 907                        body->fid1.id, body->handle.addr, body->handle.cookie);
 908                 RETURN(-ESTALE);
 909         }
 910
 911         spin_lock(&med->med_open_lock);
 912         req->rq_status = mds_close_mfd(mfd, med);
 913         spin_unlock(&med->med_open_lock);
 914
 915         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK)) {
 916                 CERROR("test case OBD_FAIL_MDS_CLOSE_PACK\n");
 917                 req->rq_status = -ENOMEM;
 918                 RETURN(-ENOMEM);
 919         }
 920
 921         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 922         if (rc) {
 923                 CERROR("mds: lustre_pack_msg: rc = %d\n", rc);
 924                 req->rq_status = rc;
 925         }
 926
 927         RETURN(0);
 928 }
 929
 930 static int mds_readpage(struct ptlrpc_request *req)
 931 {
 932         struct mds_obd *mds = mds_req2mds(req);
 933         struct vfsmount *mnt;
 934         struct dentry *de;
 935         struct file *file;
 936         struct mds_body *body, *repbody;
 937         struct obd_run_ctxt saved;
 938         int rc, size = sizeof(*body);
 939         struct obd_ucred uc;
 940         ENTRY;
 941
 942         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 943         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK)) {
 944                 CERROR("mds: out of memory\n");
 945                 GOTO(out, rc = -ENOMEM);
 946         }
 947
 948         body = lustre_msg_buf(req->rq_reqmsg, 0);
 949         uc.ouc_fsuid = body->fsuid;
 950         uc.ouc_fsgid = body->fsgid;
 951         push_ctxt(&saved, &mds->mds_ctxt, &uc);
 952         de = mds_fid2dentry(mds, &body->fid1, &mnt);
 953         if (IS_ERR(de))
 954                 GOTO(out_pop, rc = PTR_ERR(de));
 955
 956         CDEBUG(D_INODE, "ino %ld\n", de->d_inode->i_ino);
 957
 958         file = dentry_open(de, mnt, O_RDONLY | O_LARGEFILE);
 959         /* note: in case of an error, dentry_open puts dentry */
 960         if (IS_ERR(file))
 961                 GOTO(out_pop, rc = PTR_ERR(file));
 962
 963         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 964         repbody->size = file->f_dentry->d_inode->i_size;
 965         repbody->valid = OBD_MD_FLSIZE;
 966
 967         /* to make this asynchronous make sure that the handling function
 968            doesn't send a reply when this function completes. Instead a
 969            callback function would send the reply */
 970         /* note: in case of an error, dentry_open puts dentry */
 971         rc = mds_sendpage(req, file, body->size);
 972
 973         filp_close(file, 0);
 974 out_pop:
 975         pop_ctxt(&saved);
 976 out:
 977         req->rq_status = rc;
 978         RETURN(0);
 979 }
 980
 981 int mds_reint(int offset, struct ptlrpc_request *req)
 982 {
 983         int rc;
 984         struct mds_update_record rec;
 985
 986         rc = mds_update_unpack(req, offset, &rec);
 987         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNPACK)) {
 988                 CERROR("invalid record\n");
 989                 req->rq_status = -EINVAL;
 990                 RETURN(0);
 991         }
 992         /* rc will be used to interrupt a for loop over multiple records */
 993         rc = mds_reint_rec(&rec, offset, req);
 994         return rc;
 995 }
 996
 997 int mds_handle(struct ptlrpc_request *req)
 998 {
 999         int rc;
1000         ENTRY;
1001
1002         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
1003         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_HANDLE_UNPACK)) {
1004                 CERROR("lustre_mds: Invalid request\n");
1005                 GOTO(out, rc);
1006         }
1007
1008         if (req->rq_reqmsg->opc != MDS_CONNECT && req->rq_export == NULL)
1009                 GOTO(out, rc = -ENOTCONN);
1010
1011         LASSERT(!strcmp(req->rq_obd->obd_type->typ_name, LUSTRE_MDT_NAME));
1012
1013         switch (req->rq_reqmsg->opc) {
1014         case MDS_CONNECT:
1015                 CDEBUG(D_INODE, "connect\n");
1016                 OBD_FAIL_RETURN(OBD_FAIL_MDS_CONNECT_NET, 0);
1017                 rc = target_handle_connect(req);
1018                 break;
1019
1020         case MDS_DISCONNECT:
1021                 CDEBUG(D_INODE, "disconnect\n");
1022                 OBD_FAIL_RETURN(OBD_FAIL_MDS_DISCONNECT_NET, 0);
1023                 rc = target_handle_disconnect(req);
1024                 goto out;
1025
1026         case MDS_GETSTATUS:
1027                 CDEBUG(D_INODE, "getstatus\n");
1028                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETSTATUS_NET, 0);
1029                 rc = mds_getstatus(req);
1030                 break;
1031
1032         case MDS_GETLOVINFO:
1033                 CDEBUG(D_INODE, "getlovinfo\n");
1034                 rc = mds_getlovinfo(req);
1035                 break;
1036
1037         case MDS_GETATTR:
1038                 CDEBUG(D_INODE, "getattr\n");
1039                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETATTR_NET, 0);
1040                 rc = mds_getattr(0, req);
1041                 break;
1042
1043         case MDS_STATFS:
1044                 CDEBUG(D_INODE, "statfs\n");
1045                 OBD_FAIL_RETURN(OBD_FAIL_MDS_STATFS_NET, 0);
1046                 rc = mds_statfs(req);
1047                 break;
1048
1049         case MDS_READPAGE:
1050                 CDEBUG(D_INODE, "readpage\n");
1051                 OBD_FAIL_RETURN(OBD_FAIL_MDS_READPAGE_NET, 0);
1052                 rc = mds_readpage(req);
1053
1054                 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1055                         return 0;
1056                 break;
1057
1058         case MDS_REINT: {
1059                 int size = sizeof(struct mds_body);
1060                 CDEBUG(D_INODE, "reint\n");
1061                 OBD_FAIL_RETURN(OBD_FAIL_MDS_REINT_NET, 0);
1062
1063                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
1064                                      &req->rq_repmsg);
1065                 if (rc) {
1066                         req->rq_status = rc;
1067                         break;
1068                 }
1069                 rc = mds_reint(0, req);
1070                 OBD_FAIL_RETURN(OBD_FAIL_MDS_REINT_NET_REP, 0);
1071                 break;
1072                 }
1073
1074         case MDS_OPEN:
1075                 CDEBUG(D_INODE, "open\n");
1076                 OBD_FAIL_RETURN(OBD_FAIL_MDS_OPEN_NET, 0);
1077                 rc = mds_open(req);
1078                 break;
1079
1080         case MDS_CLOSE:
1081                 CDEBUG(D_INODE, "close\n");
1082                 OBD_FAIL_RETURN(OBD_FAIL_MDS_CLOSE_NET, 0);
1083                 rc = mds_close(req);
1084                 break;
1085
1086         case LDLM_ENQUEUE:
1087                 CDEBUG(D_INODE, "enqueue\n");
1088                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
1089                 rc = ldlm_handle_enqueue(req);
1090                 if (rc)
1091                         break;
1092                 RETURN(0);
1093         case LDLM_CONVERT:
1094                 CDEBUG(D_INODE, "convert\n");
1095                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
1096                 rc = ldlm_handle_convert(req);
1097                 if (rc)
1098                         break;
1099                 RETURN(0);
1100         case LDLM_BL_CALLBACK:
1101         case LDLM_CP_CALLBACK:
1102                 CDEBUG(D_INODE, "callback\n");
1103                 CERROR("callbacks should not happen on MDS\n");
1104                 LBUG();
1105                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
1106                 break;
1107         default:
1108                 rc = ptlrpc_error(req->rq_svc, req);
1109                 RETURN(rc);
1110         }
1111
1112         EXIT;
1113
1114         if (!rc) {
1115                 struct mds_export_data *med = &req->rq_export->exp_mds_data;
1116                 struct mds_obd *mds = mds_req2mds(req);
1117
1118                 req->rq_repmsg->last_xid =
1119                         HTON__u64(le64_to_cpu(med->med_mcd->mcd_last_xid));
1120                 req->rq_repmsg->last_committed =
1121                         HTON__u64(mds->mds_last_committed);
1122                 CDEBUG(D_INFO, "last_rcvd ~%Lu, last_committed %Lu, xid %d\n",
1123                        (unsigned long long)mds->mds_last_rcvd,
1124                        (unsigned long long)mds->mds_last_committed,
1125                        cpu_to_le32(req->rq_xid));
1126         }
1127  out:
1128         if (rc) {
1129                 CERROR("mds: processing error (opcode %d): %d\n",
1130                        req->rq_reqmsg->opc, rc);
1131                 ptlrpc_error(req->rq_svc, req);
1132         } else {
1133                 CDEBUG(D_NET, "sending reply\n");
1134                 ptlrpc_reply(req->rq_svc, req);
1135         }
1136         return 0;
1137 }
1138
1139 /* Update the server data on disk.  This stores the new mount_count and
1140  * also the last_rcvd value to disk.  If we don't have a clean shutdown,
1141  * then the server last_rcvd value may be less than that of the clients.
1142  * This will alert us that we may need to do client recovery.
1143  *
1144  * Assumes we are already in the server filesystem context.
1145  *
1146  * Also assumes for mds_last_rcvd that we are not modifying it (no locking).
1147  */
1148 static
1149 int mds_update_server_data(struct mds_obd *mds)
1150 {
1151         struct mds_server_data *msd = mds->mds_server_data;
1152         struct file *filp = mds->mds_rcvd_filp;
1153         loff_t off = 0;
1154         int rc;
1155
1156         msd->msd_last_rcvd = cpu_to_le64(mds->mds_last_rcvd);
1157         msd->msd_mount_count = cpu_to_le64(mds->mds_mount_count);
1158
1159         CDEBUG(D_SUPER, "MDS mount_count is %Lu, last_rcvd is %Lu\n",
1160                (unsigned long long)mds->mds_mount_count,
1161                (unsigned long long)mds->mds_last_rcvd);
1162         rc = lustre_fwrite(filp, (char *)msd, sizeof(*msd), &off);
1163         if (rc != sizeof(*msd)) {
1164                 CERROR("error writing MDS server data: rc = %d\n", rc);
1165                 if (rc > 0)
1166                         RETURN(-EIO);
1167                 RETURN(rc);
1168         }
1169 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
1170         rc = fsync_dev(filp->f_dentry->d_inode->i_rdev);
1171 #else
1172         rc = file_fsync(filp,  filp->f_dentry, 1);
1173 #endif
1174         if (rc)
1175                 CERROR("error flushing MDS server data: rc = %d\n", rc);
1176
1177         return 0;
1178 }
1179
1180 /* Do recovery actions for the MDS */
1181 static int mds_recover(struct obd_device *obddev)
1182 {
1183         struct mds_obd *mds = &obddev->u.mds;
1184         struct obd_run_ctxt saved;
1185         int rc;
1186
1187         /* This happens at the end when recovery is complete */
1188         ++mds->mds_mount_count;
1189         push_ctxt(&saved, &mds->mds_ctxt, NULL);
1190         rc = mds_update_server_data(mds);
1191         pop_ctxt(&saved);
1192
1193         return rc;
1194 }
1195
1196 /* mount the file system (secretly) */
1197 static int mds_setup(struct obd_device *obddev, obd_count len, void *buf)
1198 {
1199         struct obd_ioctl_data* data = buf;
1200         struct mds_obd *mds = &obddev->u.mds;
1201         struct vfsmount *mnt;
1202         int rc = 0;
1203         ENTRY;
1204
1205         MOD_INC_USE_COUNT;
1206 #ifdef CONFIG_DEV_RDONLY
1207         dev_clear_rdonly(2);
1208 #endif
1209         if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2)
1210                 GOTO(err_dec, rc = -EINVAL);
1211
1212         mds->mds_fstype = strdup(data->ioc_inlbuf2);
1213
1214         mnt = do_kern_mount(mds->mds_fstype, 0, data->ioc_inlbuf1, NULL);
1215         if (IS_ERR(mnt)) {
1216                 rc = PTR_ERR(mnt);
1217                 CERROR("do_kern_mount failed: rc = %d\n", rc);
1218                 GOTO(err_kfree, rc);
1219         }
1220
1221         CERROR("%s: mnt is %p\n", data->ioc_inlbuf1, mnt);
1222         mds->mds_sb = mnt->mnt_root->d_inode->i_sb;
1223         if (!mds->mds_sb)
1224                 GOTO(err_put, rc = -ENODEV);
1225
1226         spin_lock_init(&mds->mds_last_lock);
1227         mds->mds_max_mdsize = sizeof(struct lov_mds_md);
1228         rc = mds_fs_setup(obddev, mnt);
1229         if (rc) {
1230                 CERROR("MDS filesystem method init failed: rc = %d\n", rc);
1231                 GOTO(err_put, rc);
1232         }
1233
1234         obddev->obd_namespace =
1235                 ldlm_namespace_new("mds_server", LDLM_NAMESPACE_SERVER);
1236         if (obddev->obd_namespace == NULL) {
1237                 mds_cleanup(obddev);
1238                 GOTO(err_fs, rc = -ENOMEM);
1239         }
1240
1241
1242         rc = mds_recover(obddev);
1243         if (rc)
1244                 GOTO(err_fs, rc);
1245
1246         ptlrpc_init_client(LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
1247                            "mds_ldlm_client", &obddev->obd_ldlm_client);
1248
1249         RETURN(0);
1250
1251 err_fs:
1252         mds_fs_cleanup(obddev);
1253 err_put:
1254         unlock_kernel();
1255         mntput(mds->mds_vfsmnt);
1256         mds->mds_sb = 0;
1257         lock_kernel();
1258 err_kfree:
1259         kfree(mds->mds_fstype);
1260 err_dec:
1261         MOD_DEC_USE_COUNT;
1262         RETURN(rc);
1263 }
1264
1265 static int mds_cleanup(struct obd_device *obddev)
1266 {
1267         struct super_block *sb;
1268         struct mds_obd *mds = &obddev->u.mds;
1269         struct obd_run_ctxt saved;
1270         ENTRY;
1271
1272         sb = mds->mds_sb;
1273         if (!mds->mds_sb)
1274                 RETURN(0);
1275
1276         push_ctxt(&saved, &mds->mds_ctxt, NULL);
1277         mds_update_server_data(mds);
1278
1279         if (mds->mds_rcvd_filp) {
1280                 int rc = filp_close(mds->mds_rcvd_filp, 0);
1281                 mds->mds_rcvd_filp = NULL;
1282
1283                 if (rc)
1284                         CERROR("last_rcvd file won't close, rc=%d\n", rc);
1285         }
1286         pop_ctxt(&saved);
1287
1288         unlock_kernel();
1289         mntput(mds->mds_vfsmnt);
1290         mds->mds_sb = 0;
1291         kfree(mds->mds_fstype);
1292
1293         ldlm_namespace_free(obddev->obd_namespace);
1294
1295         lock_kernel();
1296 #ifdef CONFIG_DEV_RDONLY
1297         dev_clear_rdonly(2);
1298 #endif
1299         mds_fs_cleanup(obddev);
1300
1301         MOD_DEC_USE_COUNT;
1302         RETURN(0);
1303 }
1304
1305 static int ldlm_intent_policy(struct ldlm_lock *lock, void *req_cookie,
1306                               ldlm_mode_t mode, int flags, void *data)
1307 {
1308         struct ptlrpc_request *req = req_cookie;
1309         int rc = 0;
1310         ENTRY;
1311
1312         if (!req_cookie)
1313                 RETURN(0);
1314
1315         if (req->rq_reqmsg->bufcount > 1) {
1316                 /* an intent needs to be considered */
1317                 struct ldlm_intent *it = lustre_msg_buf(req->rq_reqmsg, 1);
1318                 struct mds_obd *mds= &req->rq_export->exp_obd->u.mds;
1319                 struct mds_body *mds_rep;
1320                 struct ldlm_reply *rep;
1321                 __u64 new_resid[3] = {0, 0, 0}, old_res;
1322                 int rc, size[3] = {sizeof(struct ldlm_reply),
1323                                                   sizeof(struct mds_body),
1324                                                   mds->mds_max_mdsize};
1325
1326                 it->opc = NTOH__u64(it->opc);
1327
1328                 LDLM_DEBUG(lock, "intent policy, opc: %s",
1329                            ldlm_it2str(it->opc));
1330
1331                 rc = lustre_pack_msg(3, size, NULL, &req->rq_replen,
1332                                      &req->rq_repmsg);
1333                 if (rc) {
1334                         rc = req->rq_status = -ENOMEM;
1335                         RETURN(rc);
1336                 }
1337
1338                 rep = lustre_msg_buf(req->rq_repmsg, 0);
1339                 rep->lock_policy_res1 = 1;
1340
1341                 /* execute policy */
1342                 switch ((long)it->opc) {
1343                 case IT_CREAT|IT_OPEN:
1344                         rc = mds_reint(2, req);
1345                         if (rc || (req->rq_status != 0 &&
1346                                    req->rq_status != -EEXIST)) {
1347                                 rep->lock_policy_res2 = req->rq_status;
1348                                 RETURN(ELDLM_LOCK_ABORTED);
1349                         }
1350                         break;
1351                 case IT_CREAT:
1352                 case IT_MKDIR:
1353                 case IT_MKNOD:
1354                 case IT_RENAME2:
1355                 case IT_LINK2:
1356                 case IT_RMDIR:
1357                 case IT_SYMLINK:
1358                 case IT_UNLINK:
1359                         rc = mds_reint(2, req);
1360                         if (rc || (req->rq_status != 0 &&
1361                                    req->rq_status != -EISDIR &&
1362                                    req->rq_status != -ENOTDIR)) {
1363                                 rep->lock_policy_res2 = req->rq_status;
1364                                 RETURN(ELDLM_LOCK_ABORTED);
1365                         }
1366                         break;
1367                 case IT_GETATTR:
1368                 case IT_LOOKUP:
1369                 case IT_OPEN:
1370                 case IT_READDIR:
1371                 case IT_READLINK:
1372                 case IT_RENAME:
1373                 case IT_LINK:
1374                 case IT_SETATTR:
1375                         rc = mds_getattr_name(2, req);
1376                         /* FIXME: we need to sit down and decide on who should
1377                          * set req->rq_status, who should return negative and
1378                          * positive return values, and what they all mean. */
1379                         if (rc || req->rq_status != 0) {
1380                                 rep->lock_policy_res2 = req->rq_status;
1381                                 RETURN(ELDLM_LOCK_ABORTED);
1382                         }
1383                         break;
1384                 case IT_READDIR|IT_OPEN:
1385                         LBUG();
1386                         break;
1387                 default:
1388                         CERROR("Unhandled intent\n");
1389                         LBUG();
1390                 }
1391
1392                 /* We don't bother returning a lock to the client for a file
1393                  * or directory we are removing.
1394                  *
1395                  * As for link and rename, there is no reason for the client
1396                  * to get a lock on the target at this point.  If they are
1397                  * going to modify the file/directory later they will get a
1398                  * lock at that time.
1399                  */
1400                 if (it->opc & (IT_UNLINK | IT_RMDIR | IT_LINK | IT_LINK2 |
1401                                IT_RENAME | IT_RENAME2))
1402                         RETURN(ELDLM_LOCK_ABORTED);
1403
1404                 rep->lock_policy_res2 = req->rq_status;
1405                 mds_rep = lustre_msg_buf(req->rq_repmsg, 1);
1406
1407                 /* If the client is about to open a file that doesn't have an MD
1408                  * stripe record, it's going to need a write lock. */
1409                 if (it->opc & IT_OPEN) {
1410                         struct lov_mds_md *lmm =
1411                                 lustre_msg_buf(req->rq_repmsg, 2);
1412                         if (lmm->lmm_easize == 0) {
1413                                 LDLM_DEBUG(lock, "open with no EA; returning PW"
1414                                            " lock");
1415                                 lock->l_req_mode = LCK_PW;
1416                         }
1417                 }
1418
1419                 if (flags & LDLM_FL_INTENT_ONLY) {
1420                         LDLM_DEBUG(lock, "INTENT_ONLY, aborting lock");
1421                         RETURN(ELDLM_LOCK_ABORTED);
1422                 }
1423                 /* Give the client a lock on the child object, instead of the
1424                  * parent that it requested. */
1425                 new_resid[0] = NTOH__u32(mds_rep->ino);
1426                 new_resid[1] = NTOH__u32(mds_rep->generation);
1427                 if (new_resid[0] == 0)
1428                         LBUG();
1429                 old_res = lock->l_resource->lr_name[0];
1430
1431                 ldlm_lock_change_resource(lock, new_resid);
1432                 if (lock->l_resource == NULL) {
1433                         LBUG();
1434                         RETURN(-ENOMEM);
1435                 }
1436                 LDLM_DEBUG(lock, "intent policy, old res %ld",
1437                            (long)old_res);
1438                 RETURN(ELDLM_LOCK_CHANGED);
1439         } else {
1440                 int size = sizeof(struct ldlm_reply);
1441                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
1442                                      &req->rq_repmsg);
1443                 if (rc) {
1444                         LBUG();
1445                         RETURN(-ENOMEM);
1446                 }
1447         }
1448         RETURN(rc);
1449 }
1450
1451
1452 #define MDT_NUM_THREADS 8
1453 static int mdt_setup(struct obd_device *obddev, obd_count len, void *buf)
1454 {
1455         int i;
1456         //        struct obd_ioctl_data* data = buf;
1457         struct mds_obd *mds = &obddev->u.mds;
1458         int rc = 0;
1459         ENTRY;
1460
1461         MOD_INC_USE_COUNT;
1462
1463         mds->mds_service = ptlrpc_init_svc(MDS_NEVENTS, MDS_NBUFS,
1464                                            MDS_BUFSIZE, MDS_MAXREQSIZE,
1465                                            MDS_REQUEST_PORTAL, MDC_REPLY_PORTAL,
1466                                            "self", mds_handle, "mds");
1467         if (!mds->mds_service) {
1468                 CERROR("failed to start service\n");
1469                 GOTO(err_dec, rc = -EINVAL);
1470         }
1471
1472         for (i = 0; i < MDT_NUM_THREADS; i++) {
1473                 char name[32];
1474                 sprintf(name, "lustre_MDT_%02d", i);
1475                 rc = ptlrpc_start_thread(obddev, mds->mds_service, name);
1476                 if (rc) {
1477                         CERROR("cannot start MDT thread #%d: rc %d\n", i, rc);
1478                         GOTO(err_thread, rc);
1479                 }
1480         }
1481
1482         RETURN(0);
1483
1484 err_thread:
1485         ptlrpc_stop_all_threads(mds->mds_service);
1486         ptlrpc_unregister_service(mds->mds_service);
1487 err_dec:
1488         MOD_DEC_USE_COUNT;
1489         RETURN(rc);
1490 }
1491
1492
1493 static int mdt_cleanup(struct obd_device *obddev)
1494 {
1495         struct mds_obd *mds = &obddev->u.mds;
1496         ENTRY;
1497
1498         ptlrpc_stop_all_threads(mds->mds_service);
1499         ptlrpc_unregister_service(mds->mds_service);
1500
1501         MOD_DEC_USE_COUNT;
1502         RETURN(0);
1503 }
1504
1505 extern int mds_iocontrol(long cmd, struct lustre_handle *conn,
1506                          int len, void *karg, void *uarg);
1507
1508 /* use obd ops to offer management infrastructure */
1509 static struct obd_ops mds_obd_ops = {
1510         o_connect:     mds_connect,
1511         o_disconnect:  mds_disconnect,
1512         o_setup:       mds_setup,
1513         o_cleanup:     mds_cleanup,
1514         o_iocontrol:   mds_iocontrol
1515 };
1516
1517 static struct obd_ops mdt_obd_ops = {
1518         o_setup:       mdt_setup,
1519         o_cleanup:     mdt_cleanup,
1520 };
1521
1522
1523 static int __init mds_init(void)
1524 {
1525         mds_file_cache = kmem_cache_create("ll_mds_file_data",
1526                                            sizeof(struct mds_file_data),
1527                                            0, 0, NULL, NULL);
1528         if (mds_file_cache == NULL)
1529                 return -ENOMEM;
1530
1531         class_register_type(&mds_obd_ops, LUSTRE_MDS_NAME);
1532         class_register_type(&mdt_obd_ops, LUSTRE_MDT_NAME);
1533         ldlm_register_intent(ldlm_intent_policy);
1534         return 0;
1535 }
1536
1537 static void __exit mds_exit(void)
1538 {
1539         ldlm_unregister_intent();
1540         class_unregister_type(LUSTRE_MDS_NAME);
1541         class_unregister_type(LUSTRE_MDT_NAME);
1542         if (kmem_cache_destroy(mds_file_cache))
1543                 CERROR("couldn't free MDS file cache\n");
1544 }
1545
1546 MODULE_AUTHOR("Cluster File Systems <info@clusterfs.com>");
1547 MODULE_DESCRIPTION("Lustre Metadata Server (MDS) v0.01");
1548 MODULE_LICENSE("GPL");
1549
1550 module_init(mds_init);
1551 module_exit(mds_exit);