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