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
 337         rc = class_disconnect(conn);
 338         if (!rc)
 339                 MOD_DEC_USE_COUNT;
 340
 341         return rc;
 342 }
 343
 344 static int mds_getstatus(struct ptlrpc_request *req)
 345 {
 346         struct mds_obd *mds = mds_req2mds(req);
 347         struct mds_body *body;
 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         /* Anything we need to do here with the client's trans no or so? */
 359         body = lustre_msg_buf(req->rq_repmsg, 0);
 360         memcpy(&body->fid1, &mds->mds_rootfid, sizeof(body->fid1));
 361
 362         /* the last_committed and last_xid fields are filled in for all
 363          * replies already - no need to do so here also.
 364          */
 365         RETURN(0);
 366 }
 367
 368 static int mds_getlovinfo(struct ptlrpc_request *req)
 369 {
 370         struct mds_obd *mds = mds_req2mds(req);
 371         struct mds_status_req *streq;
 372         struct lov_desc *desc;
 373         int tgt_count;
 374         int rc, size[2] = {sizeof(*desc)};
 375         ENTRY;
 376
 377         streq = lustre_msg_buf(req->rq_reqmsg, 0);
 378         streq->flags = NTOH__u32(streq->flags);
 379         streq->repbuf = NTOH__u32(streq->repbuf);
 380         size[1] = streq->repbuf;
 381
 382         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 383         if (rc) {
 384                 CERROR("mds: out of memory for message: size=%d\n", size[1]);
 385                 req->rq_status = -ENOMEM;
 386                 RETURN(0);
 387         }
 388
 389         desc = lustre_msg_buf(req->rq_repmsg, 0);
 390         rc = mds_get_lovdesc(req->rq_obd, desc);
 391         if (rc != 0 ) {
 392                 CERROR("mds_get_lovdesc error %d", rc);
 393                 req->rq_status = rc;
 394                 RETURN(0);
 395         }
 396
 397         tgt_count = le32_to_cpu(desc->ld_tgt_count);
 398         if (tgt_count * sizeof(obd_uuid_t) > streq->repbuf) {
 399                 CERROR("too many targets, enlarge client buffers\n");
 400                 req->rq_status = -ENOSPC;
 401                 RETURN(0);
 402         }
 403
 404         mds->mds_max_mdsize = sizeof(struct lov_mds_md) +
 405                 tgt_count * sizeof(struct lov_object_id);
 406         rc = mds_get_lovtgts(req->rq_obd, tgt_count,
 407                              lustre_msg_buf(req->rq_repmsg, 1));
 408         if (rc) {
 409                 CERROR("get_lovtgts error %d\n", rc);
 410                 req->rq_status = rc;
 411                 RETURN(0);
 412         }
 413         RETURN(0);
 414 }
 415
 416 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 417                      void *data, __u32 data_len)
 418 {
 419         int do_ast;
 420         ENTRY;
 421
 422         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 423         lock->l_flags |= LDLM_FL_CBPENDING;
 424         do_ast = (!lock->l_readers && !lock->l_writers);
 425         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 426
 427         if (do_ast) {
 428                 struct lustre_handle lockh;
 429                 int rc;
 430
 431                 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
 432                 ldlm_lock2handle(lock, &lockh);
 433                 rc = ldlm_cli_cancel(&lockh);
 434                 if (rc < 0)
 435                         CERROR("ldlm_cli_cancel: %d\n", rc);
 436         } else
 437                 LDLM_DEBUG(lock, "Lock still has references, will be"
 438                            "cancelled later");
 439         RETURN(0);
 440 }
 441
 442 static int mds_getattr_internal(struct mds_obd *mds, struct dentry *dentry,
 443                                 struct ptlrpc_request *req,
 444                                 struct mds_body *reqbody, int reply_off)
 445 {
 446         struct mds_body *body;
 447         struct inode *inode = dentry->d_inode;
 448         int rc;
 449         ENTRY;
 450
 451         if (inode == NULL)
 452                 RETURN(-ENOENT);
 453
 454         body = lustre_msg_buf(req->rq_repmsg, reply_off);
 455
 456         mds_pack_inode2fid(&body->fid1, inode);
 457         mds_pack_inode2body(body, inode);
 458
 459         if (S_ISREG(inode->i_mode)) {
 460                 struct lov_mds_md *lmm;
 461
 462                 lmm = lustre_msg_buf(req->rq_repmsg, reply_off + 1);
 463                 lmm->lmm_easize = mds->mds_max_mdsize;
 464                 rc = mds_fs_get_md(mds, inode, lmm);
 465
 466                 if (rc < 0) {
 467                         if (rc == -ENODATA)
 468                                 RETURN(0);
 469                         CERROR("mds_fs_get_md failed: %d\n", rc);
 470                         RETURN(rc);
 471                 }
 472                 body->valid |= OBD_MD_FLEASIZE;
 473         } else if (S_ISLNK(inode->i_mode) && reqbody->valid & OBD_MD_LINKNAME) {
 474                 char *symname = lustre_msg_buf(req->rq_repmsg, reply_off + 1);
 475                 int len = req->rq_repmsg->buflens[reply_off + 1];
 476
 477                 rc = inode->i_op->readlink(dentry, symname, len);
 478                 if (rc < 0) {
 479                         CERROR("readlink failed: %d\n", rc);
 480                         RETURN(rc);
 481                 } else
 482                         CDEBUG(D_INODE, "read symlink dest %s\n", symname);
 483
 484                 body->valid |= OBD_MD_LINKNAME;
 485         }
 486         RETURN(0);
 487 }
 488
 489 static int mds_getattr_name(int offset, struct ptlrpc_request *req)
 490 {
 491         struct mds_obd *mds = mds_req2mds(req);
 492         struct obd_device *obd = req->rq_export->exp_obd;
 493         struct obd_run_ctxt saved;
 494         struct mds_body *body;
 495         struct dentry *de = NULL, *dchild = NULL;
 496         struct inode *dir;
 497         struct lustre_handle lockh;
 498         char *name;
 499         int namelen, flags, lock_mode, rc = 0;
 500         __u64 res_id[3] = {0, 0, 0};
 501         ENTRY;
 502
 503         LASSERT(!strcmp(req->rq_export->exp_obd->obd_type->typ_name, "mds"));
 504
 505         if (req->rq_reqmsg->bufcount <= offset + 1) {
 506                 LBUG();
 507                 GOTO(out_pre_de, rc = -EINVAL);
 508         }
 509
 510         body = lustre_msg_buf(req->rq_reqmsg, offset);
 511         name = lustre_msg_buf(req->rq_reqmsg, offset + 1);
 512         namelen = req->rq_reqmsg->buflens[offset + 1];
 513         /* requests were at offset 2, replies go back at 1 */
 514         if (offset)
 515                 offset = 1;
 516
 517         push_ctxt(&saved, &mds->mds_ctxt);
 518         de = mds_fid2dentry(mds, &body->fid1, NULL);
 519         if (IS_ERR(de)) {
 520                 LBUG();
 521                 GOTO(out_pre_de, rc = -ESTALE);
 522         }
 523
 524         dir = de->d_inode;
 525         CDEBUG(D_INODE, "parent ino %ld, name %*s\n", dir->i_ino,namelen,name);
 526
 527         lock_mode = (req->rq_reqmsg->opc == MDS_REINT) ? LCK_CW : LCK_PW;
 528         res_id[0] = dir->i_ino;
 529
 530         rc = ldlm_lock_match(obd->obd_namespace, res_id, LDLM_PLAIN,
 531                              NULL, 0, lock_mode, &lockh);
 532         if (rc == 0) {
 533                 LDLM_DEBUG_NOLOCK("enqueue res "LPU64, res_id[0]);
 534                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 535                                       res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 536                                       &flags, ldlm_completion_ast,
 537                                       mds_blocking_ast, NULL, 0, &lockh);
 538                 if (rc != ELDLM_OK) {
 539                         CERROR("lock enqueue: err: %d\n", rc);
 540                         GOTO(out_create_de, rc = -EIO);
 541                 }
 542         }
 543         ldlm_lock_dump((void *)(unsigned long)lockh.addr);
 544
 545         down(&dir->i_sem);
 546         dchild = lookup_one_len(name, de, namelen - 1);
 547         if (IS_ERR(dchild)) {
 548                 CDEBUG(D_INODE, "child lookup error %ld\n", PTR_ERR(dchild));
 549                 up(&dir->i_sem);
 550                 LBUG();
 551                 GOTO(out_create_dchild, rc = -ESTALE);
 552         }
 553
 554         rc = mds_getattr_internal(mds, dchild, req, body, offset);
 555
 556         EXIT;
 557 out_create_dchild:
 558         l_dput(dchild);
 559         up(&dir->i_sem);
 560         ldlm_lock_decref(&lockh, lock_mode);
 561 out_create_de:
 562         l_dput(de);
 563 out_pre_de:
 564         req->rq_status = rc;
 565         pop_ctxt(&saved);
 566         return 0;
 567 }
 568
 569 static int mds_getattr(int offset, struct ptlrpc_request *req)
 570 {
 571         struct mds_obd *mds = mds_req2mds(req);
 572         struct obd_run_ctxt saved;
 573         struct dentry *de;
 574         struct inode *inode;
 575         struct mds_body *body;
 576         int rc = 0, size[2] = {sizeof(*body)}, bufcount = 1;
 577         ENTRY;
 578
 579         body = lustre_msg_buf(req->rq_reqmsg, offset);
 580         push_ctxt(&saved, &mds->mds_ctxt);
 581         de = mds_fid2dentry(mds, &body->fid1, NULL);
 582         if (IS_ERR(de)) {
 583                 req->rq_status = -ENOENT;
 584                 rc = 0;
 585                 GOTO(out_pop, PTR_ERR(de));
 586         }
 587
 588         inode = de->d_inode;
 589         if (S_ISREG(body->fid1.f_type)) {
 590                 bufcount = 2;
 591                 size[1] = mds->mds_max_mdsize;
 592         } else if (body->valid & OBD_MD_LINKNAME) {
 593                 bufcount = 2;
 594                 size[1] = inode->i_size + 1;
 595         }
 596
 597         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK)) {
 598                 CERROR("failed GETATTR_PACK test\n");
 599                 req->rq_status = -ENOMEM;
 600                 GOTO(out, rc = -ENOMEM);
 601         }
 602
 603         rc = lustre_pack_msg(bufcount, size, NULL, &req->rq_replen,
 604                              &req->rq_repmsg);
 605         if (rc) {
 606                 CERROR("out of memory or FAIL_MDS_GETATTR_PACK\n");
 607                 req->rq_status = rc;
 608                 GOTO(out, rc);
 609         }
 610
 611         req->rq_status = mds_getattr_internal(mds, de, req, body, 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         statfs_pack(osfs, &sfs);
 643         obd_statfs_pack(osfs, osfs);
 644
 645 out:
 646         req->rq_status = rc;
 647         RETURN(0);
 648 }
 649
 650 static int mds_open(struct ptlrpc_request *req)
 651 {
 652         struct dentry *de;
 653         struct mds_body *body;
 654         struct file *file;
 655         struct vfsmount *mnt;
 656         struct mds_obd *mds = mds_req2mds(req);
 657         struct mds_export_data *med;
 658         __u32 flags;
 659         struct list_head *tmp;
 660         struct mds_file_data *mfd;
 661         int rc, size = sizeof(*body);
 662         ENTRY;
 663
 664         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 665         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK)) {
 666                 CERROR("mds: out of memory\n");
 667                 req->rq_status = -ENOMEM;
 668                 RETURN(0);
 669         }
 670
 671         body = lustre_msg_buf(req->rq_reqmsg, 0);
 672
 673         /* was this animal open already? */
 674         /* XXX we should only check on re-open, or do a refcount... */
 675         med = &req->rq_export->exp_mds_data;
 676         list_for_each(tmp, &med->med_open_head) {
 677                 struct mds_file_data *fd;
 678                 fd = list_entry(tmp, struct mds_file_data, mfd_list);
 679                 if (body->extra == fd->mfd_clientfd &&
 680                     body->fid1.id == fd->mfd_file->f_dentry->d_inode->i_ino) {
 681                         CERROR("Re opening "LPD64"\n", body->fid1.id);
 682                         RETURN(0);
 683                 }
 684         }
 685
 686         OBD_ALLOC(mfd, sizeof(*mfd));
 687         if (!mfd) {
 688                 CERROR("mds: out of memory\n");
 689                 req->rq_status = -ENOMEM;
 690                 RETURN(0);
 691         }
 692
 693         de = mds_fid2dentry(mds, &body->fid1, &mnt);
 694         if (IS_ERR(de)) {
 695                 req->rq_status = -ENOENT;
 696                 RETURN(0);
 697         }
 698
 699         /* check if this inode has seen a delayed object creation */
 700         if (req->rq_reqmsg->bufcount > 1) {
 701                 void *handle;
 702                 struct lov_mds_md *lmm;
 703                 struct inode *inode = de->d_inode;
 704                 int rc;
 705
 706                 lmm = lustre_msg_buf(req->rq_reqmsg, 1);
 707
 708                 handle = mds_fs_start(mds, de->d_inode, MDS_FSOP_SETATTR);
 709                 if (!handle) {
 710                         req->rq_status = -ENOMEM;
 711                         RETURN(0);
 712                 }
 713
 714                 /* XXX error handling */
 715                 rc = mds_fs_set_md(mds, inode, handle, lmm);
 716                 if (!rc) {
 717                         struct obd_run_ctxt saved;
 718                         push_ctxt(&saved, &mds->mds_ctxt);
 719                         rc = mds_update_last_rcvd(mds, handle, req);
 720                         pop_ctxt(&saved);
 721                 } else {
 722                         req->rq_status = rc;
 723                         RETURN(0);
 724                 }
 725                 /* FIXME: need to return last_rcvd, last_committed */
 726
 727                 /* FIXME: keep rc intact */
 728                 rc = mds_fs_commit(mds, de->d_inode, handle);
 729                 if (rc) {
 730                         req->rq_status = rc;
 731                         RETURN(0);
 732                 }
 733         }
 734
 735         flags = body->flags;
 736         file = dentry_open(de, mnt, flags & ~O_DIRECT);
 737         if (!file || IS_ERR(file)) {
 738                 req->rq_status = -EINVAL;
 739                 OBD_FREE(mfd, sizeof(*mfd));
 740                 RETURN(0);
 741         }
 742
 743         file->private_data = mfd;
 744         mfd->mfd_file = file;
 745         mfd->mfd_clientfd = body->extra;
 746         list_add(&mfd->mfd_list, &med->med_open_head);
 747
 748         body = lustre_msg_buf(req->rq_repmsg, 0);
 749         /* FIXME: need to have cookies involved here */
 750         body->extra = (__u64) (unsigned long)file;
 751         RETURN(0);
 752 }
 753
 754 static int mds_close(struct ptlrpc_request *req)
 755 {
 756         struct dentry *de;
 757         struct mds_body *body;
 758         struct file *file;
 759         struct mds_obd *mds = mds_req2mds(req);
 760         struct vfsmount *mnt;
 761         struct mds_file_data *mfd;
 762         int rc;
 763         ENTRY;
 764
 765         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 766         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK)) {
 767                 CERROR("mds: out of memory\n");
 768                 req->rq_status = -ENOMEM;
 769                 RETURN(0);
 770         }
 771
 772         body = lustre_msg_buf(req->rq_reqmsg, 0);
 773         de = mds_fid2dentry(mds, &body->fid1, &mnt);
 774         if (IS_ERR(de)) {
 775                 req->rq_status = -ENOENT;
 776                 RETURN(0);
 777         }
 778
 779         /* FIXME: need to have cookies involved here */
 780         file = (struct file *)(unsigned long)body->extra;
 781         if (!file->f_dentry)
 782                 LBUG();
 783         mfd = (struct mds_file_data *)file->private_data;
 784         list_del(&mfd->mfd_list);
 785         OBD_FREE(mfd, sizeof(*mfd));
 786
 787         req->rq_status = filp_close(file, 0);
 788         l_dput(de);
 789         mntput(mnt);
 790
 791         RETURN(0);
 792 }
 793
 794 static int mds_readpage(struct ptlrpc_request *req)
 795 {
 796         struct mds_obd *mds = mds_req2mds(req);
 797         struct vfsmount *mnt;
 798         struct dentry *de;
 799         struct file *file;
 800         struct mds_body *body, *repbody;
 801         struct obd_run_ctxt saved;
 802         int rc, size = sizeof(*body);
 803         ENTRY;
 804
 805         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 806         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK)) {
 807                 CERROR("mds: out of memory\n");
 808                 GOTO(out, rc = -ENOMEM);
 809         }
 810
 811         body = lustre_msg_buf(req->rq_reqmsg, 0);
 812         push_ctxt(&saved, &mds->mds_ctxt);
 813         de = mds_fid2dentry(mds, &body->fid1, &mnt);
 814         if (IS_ERR(de))
 815                 GOTO(out_pop, rc = PTR_ERR(de));
 816
 817         CDEBUG(D_INODE, "ino %ld\n", de->d_inode->i_ino);
 818
 819         file = dentry_open(de, mnt, O_RDONLY | O_LARGEFILE);
 820         /* note: in case of an error, dentry_open puts dentry */
 821         if (IS_ERR(file))
 822                 GOTO(out_pop, rc = PTR_ERR(file));
 823
 824         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 825         repbody->size = file->f_dentry->d_inode->i_size;
 826         repbody->valid = OBD_MD_FLSIZE;
 827
 828         /* to make this asynchronous make sure that the handling function
 829            doesn't send a reply when this function completes. Instead a
 830            callback function would send the reply */
 831         /* note: in case of an error, dentry_open puts dentry */
 832         rc = mds_sendpage(req, file, body->size);
 833
 834         filp_close(file, 0);
 835 out_pop:
 836         pop_ctxt(&saved);
 837 out:
 838         req->rq_status = rc;
 839         RETURN(0);
 840 }
 841
 842 int mds_reint(int offset, struct ptlrpc_request *req)
 843 {
 844         int rc;
 845         struct mds_update_record rec;
 846
 847         rc = mds_update_unpack(req, offset, &rec);
 848         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNPACK)) {
 849                 CERROR("invalid record\n");
 850                 req->rq_status = -EINVAL;
 851                 RETURN(0);
 852         }
 853         /* rc will be used to interrupt a for loop over multiple records */
 854         rc = mds_reint_rec(&rec, offset, req);
 855         return rc;
 856 }
 857
 858 int mds_handle(struct ptlrpc_request *req)
 859 {
 860         int rc;
 861         ENTRY;
 862
 863         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 864         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_HANDLE_UNPACK)) {
 865                 CERROR("lustre_mds: Invalid request\n");
 866                 GOTO(out, rc);
 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_export_data *med = &req->rq_export->exp_mds_data;
 987                 struct mds_obd *mds = mds_req2mds(req);
 988
 989                 req->rq_repmsg->last_xid =
 990                         HTON__u64(le64_to_cpu(med->med_mcd->mcd_last_xid));
 991                 req->rq_repmsg->last_committed =
 992                         HTON__u64(mds->mds_last_committed);
 993                 CDEBUG(D_INFO, "last_rcvd ~%Lu, last_committed %Lu, xid %d\n",
 994                        (unsigned long long)mds->mds_last_rcvd,
 995                        (unsigned long long)mds->mds_last_committed,
 996                        cpu_to_le32(req->rq_xid));
 997         }
 998  out:
 999         if (rc) {
1000                 CERROR("mds: processing error %d\n", rc);
1001                 ptlrpc_error(req->rq_svc, req);
1002         } else {
1003                 CDEBUG(D_NET, "sending reply\n");
1004                 ptlrpc_reply(req->rq_svc, req);
1005         }
1006         return 0;
1007 }
1008
1009 /* Update the server data on disk.  This stores the new mount_count and
1010  * also the last_rcvd value to disk.  If we don't have a clean shutdown,
1011  * then the server last_rcvd value may be less than that of the clients.
1012  * This will alert us that we may need to do client recovery.
1013  *
1014  * Assumes we are already in the server filesystem context.
1015  *
1016  * Also assumes for mds_last_rcvd that we are not modifying it (no locking).
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         spin_lock_init(&mds->mds_last_lock);
1094         mds->mds_max_mdsize = sizeof(struct lov_mds_md);
1095         rc = mds_fs_setup(obddev, mnt);
1096         if (rc) {
1097                 CERROR("MDS filesystem method init failed: rc = %d\n", rc);
1098                 GOTO(err_put, rc);
1099         }
1100
1101         mds->mds_service = ptlrpc_init_svc(MDS_NEVENTS, MDS_NBUFS,
1102                                            MDS_BUFSIZE, MDS_MAXREQSIZE,
1103                                            MDS_REQUEST_PORTAL, MDC_REPLY_PORTAL,
1104                                            "self", mds_handle, "mds");
1105         if (!mds->mds_service) {
1106                 CERROR("failed to start service\n");
1107                 GOTO(err_fs, rc = -EINVAL);
1108         }
1109
1110         obddev->obd_namespace =
1111                 ldlm_namespace_new("mds_server", LDLM_NAMESPACE_SERVER);
1112         if (obddev->obd_namespace == NULL) {
1113                 mds_cleanup(obddev);
1114                 GOTO(err_svc, rc = -ENOMEM);
1115         }
1116
1117         for (i = 0; i < MDS_NUM_THREADS; i++) {
1118                 char name[32];
1119                 sprintf(name, "lustre_MDS_%02d", i);
1120                 rc = ptlrpc_start_thread(obddev, mds->mds_service, name);
1121                 if (rc) {
1122                         CERROR("cannot start MDS thread #%d: rc %d\n", i, rc);
1123                         GOTO(err_thread, rc);
1124                 }
1125         }
1126
1127         rc = mds_recover(obddev);
1128         if (rc)
1129                 GOTO(err_thread, rc);
1130
1131         mds_destroy_export = mds_client_free;
1132
1133         ptlrpc_init_client(LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
1134                            "mds_ldlm_client", &obddev->obd_ldlm_client);
1135
1136         RETURN(0);
1137
1138 err_thread:
1139         ptlrpc_stop_all_threads(mds->mds_service);
1140 err_svc:
1141         ptlrpc_unregister_service(mds->mds_service);
1142 err_fs:
1143         mds_fs_cleanup(obddev);
1144 err_put:
1145         unlock_kernel();
1146         mntput(mds->mds_vfsmnt);
1147         mds->mds_sb = 0;
1148         lock_kernel();
1149 err_kfree:
1150         kfree(mds->mds_fstype);
1151 err_dec:
1152         MOD_DEC_USE_COUNT;
1153         return rc;
1154 }
1155
1156 static int mds_cleanup(struct obd_device *obddev)
1157 {
1158         struct super_block *sb;
1159         struct mds_obd *mds = &obddev->u.mds;
1160         struct obd_run_ctxt saved;
1161         ENTRY;
1162
1163         ptlrpc_stop_all_threads(mds->mds_service);
1164         ptlrpc_unregister_service(mds->mds_service);
1165
1166         sb = mds->mds_sb;
1167         if (!mds->mds_sb)
1168                 RETURN(0);
1169
1170         push_ctxt(&saved, &mds->mds_ctxt);
1171         mds_update_server_data(mds);
1172
1173         if (mds->mds_rcvd_filp) {
1174                 int rc = filp_close(mds->mds_rcvd_filp, 0);
1175                 mds->mds_rcvd_filp = NULL;
1176
1177                 if (rc)
1178                         CERROR("last_rcvd file won't close, rc=%d\n", rc);
1179         }
1180         pop_ctxt(&saved);
1181
1182         unlock_kernel();
1183         mntput(mds->mds_vfsmnt);
1184         mds->mds_sb = 0;
1185         kfree(mds->mds_fstype);
1186
1187         ldlm_namespace_free(obddev->obd_namespace);
1188
1189         lock_kernel();
1190 #ifdef CONFIG_DEV_RDONLY
1191         dev_clear_rdonly(2);
1192 #endif
1193         mds_fs_cleanup(obddev);
1194
1195         MOD_DEC_USE_COUNT;
1196         RETURN(0);
1197 }
1198
1199 static int ldlm_intent_policy(struct ldlm_lock *lock, void *req_cookie,
1200                               ldlm_mode_t mode, void *data)
1201 {
1202         struct ptlrpc_request *req = req_cookie;
1203         int rc = 0;
1204         ENTRY;
1205
1206         if (!req_cookie)
1207                 RETURN(0);
1208
1209         if (req->rq_reqmsg->bufcount > 1) {
1210                 /* an intent needs to be considered */
1211                 struct ldlm_intent *it = lustre_msg_buf(req->rq_reqmsg, 1);
1212                 struct mds_obd *mds= &req->rq_export->exp_obd->u.mds;
1213                 struct mds_body *mds_rep;
1214                 struct ldlm_reply *rep;
1215                 __u64 new_resid[3] = {0, 0, 0}, old_res;
1216                 int rc, size[3] = {sizeof(struct ldlm_reply),
1217                                                   sizeof(struct mds_body),
1218                                                   mds->mds_max_mdsize};
1219
1220                 it->opc = NTOH__u64(it->opc);
1221
1222                 LDLM_DEBUG(lock, "intent policy, opc: %s",
1223                            ldlm_it2str(it->opc));
1224
1225                 rc = lustre_pack_msg(3, size, NULL, &req->rq_replen,
1226                                      &req->rq_repmsg);
1227                 if (rc) {
1228                         rc = req->rq_status = -ENOMEM;
1229                         RETURN(rc);
1230                 }
1231
1232                 rep = lustre_msg_buf(req->rq_repmsg, 0);
1233                 rep->lock_policy_res1 = 1;
1234
1235                 /* execute policy */
1236                 switch ((long)it->opc) {
1237                 case IT_CREAT|IT_OPEN:
1238                         rc = mds_reint(2, req);
1239                         if (rc || (req->rq_status != 0 &&
1240                                    req->rq_status != -EEXIST)) {
1241                                 rep->lock_policy_res2 = req->rq_status;
1242                                 RETURN(ELDLM_LOCK_ABORTED);
1243                         }
1244                         break;
1245                 case IT_CREAT:
1246                 case IT_MKDIR:
1247                 case IT_MKNOD:
1248                 case IT_RENAME2:
1249                 case IT_LINK2:
1250                 case IT_RMDIR:
1251                 case IT_SYMLINK:
1252                 case IT_UNLINK:
1253                         rc = mds_reint(2, req);
1254                         if (rc || (req->rq_status != 0 &&
1255                                    req->rq_status != -EISDIR &&
1256                                    req->rq_status != -ENOTDIR)) {
1257                                 rep->lock_policy_res2 = req->rq_status;
1258                                 RETURN(ELDLM_LOCK_ABORTED);
1259                         }
1260                         break;
1261                 case IT_GETATTR:
1262                 case IT_LOOKUP:
1263                 case IT_OPEN:
1264                 case IT_READDIR:
1265                 case IT_READLINK:
1266                 case IT_RENAME:
1267                 case IT_LINK:
1268                 case IT_SETATTR:
1269                         rc = mds_getattr_name(2, req);
1270                         /* FIXME: we need to sit down and decide on who should
1271                          * set req->rq_status, who should return negative and
1272                          * positive return values, and what they all mean. */
1273                         if (rc || req->rq_status != 0) {
1274                                 rep->lock_policy_res2 = req->rq_status;
1275                                 RETURN(ELDLM_LOCK_ABORTED);
1276                         }
1277                         break;
1278                 case IT_READDIR|IT_OPEN:
1279                         LBUG();
1280                         break;
1281                 default:
1282                         CERROR("Unhandled intent\n");
1283                         LBUG();
1284                 }
1285
1286                 /* We don't bother returning a lock to the client for a file
1287                  * or directory we are removing.
1288                  *
1289                  * As for link and rename, there is no reason for the client
1290                  * to get a lock on the target at this point.  If they are
1291                  * going to modify the file/directory later they will get a
1292                  * lock at that time.
1293                  */
1294                 if (it->opc & (IT_UNLINK | IT_RMDIR | IT_LINK | IT_LINK2 |
1295                                IT_RENAME | IT_RENAME2))
1296                         RETURN(ELDLM_LOCK_ABORTED);
1297
1298                 rep->lock_policy_res2 = req->rq_status;
1299                 mds_rep = lustre_msg_buf(req->rq_repmsg, 1);
1300
1301                 /* If the client is about to open a file that doesn't have an MD
1302                  * stripe record, it's going to need a write lock. */
1303                 if (it->opc & IT_OPEN) {
1304                         struct lov_mds_md *lmm =
1305                                 lustre_msg_buf(req->rq_repmsg, 2);
1306                         if (lmm->lmm_easize == 0) {
1307                                 LDLM_DEBUG(lock, "open with no EA; returning PW"
1308                                            " lock");
1309                                 lock->l_req_mode = LCK_PW;
1310                         }
1311                 }
1312
1313                 /* Give the client a lock on the child object, instead of the
1314                  * parent that it requested. */
1315                 new_resid[0] = NTOH__u32(mds_rep->ino);
1316                 if (new_resid[0] == 0)
1317                         LBUG();
1318                 old_res = lock->l_resource->lr_name[0];
1319
1320                 ldlm_lock_change_resource(lock, new_resid);
1321                 if (lock->l_resource == NULL) {
1322                         LBUG();
1323                         RETURN(-ENOMEM);
1324                 }
1325                 LDLM_DEBUG(lock, "intent policy, old res %ld",
1326                            (long)old_res);
1327                 RETURN(ELDLM_LOCK_CHANGED);
1328         } else {
1329                 int size = sizeof(struct ldlm_reply);
1330                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
1331                                      &req->rq_repmsg);
1332                 if (rc) {
1333                         LBUG();
1334                         RETURN(-ENOMEM);
1335                 }
1336         }
1337         RETURN(rc);
1338 }
1339
1340
1341 extern int mds_iocontrol(long cmd, struct lustre_handle *conn,
1342                          int len, void *karg, void *uarg);
1343
1344 /* use obd ops to offer management infrastructure */
1345 static struct obd_ops mds_obd_ops = {
1346         o_connect:     mds_connect,
1347         o_disconnect:  mds_disconnect,
1348         o_setup:       mds_setup,
1349         o_cleanup:     mds_cleanup,
1350         o_iocontrol:   mds_iocontrol
1351 };
1352
1353 static int __init mds_init(void)
1354 {
1355         class_register_type(&mds_obd_ops, LUSTRE_MDS_NAME);
1356         ldlm_register_intent(ldlm_intent_policy);
1357         return 0;
1358 }
1359
1360 static void __exit mds_exit(void)
1361 {
1362         ldlm_unregister_intent();
1363         class_unregister_type(LUSTRE_MDS_NAME);
1364 }
1365
1366 MODULE_AUTHOR("Cluster File Systems <info@clusterfs.com>");
1367 MODULE_DESCRIPTION("Lustre Metadata Server (MDS) v0.01");
1368 MODULE_LICENSE("GPL");
1369
1370 module_init(mds_init);
1371 module_exit(mds_exit);