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