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