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