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