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 #include <linux/random.h>
  37 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
  38 #include <linux/buffer_head.h>
  39 #endif
  40
  41 static kmem_cache_t *mds_file_cache;
  42
  43 extern int mds_get_lovtgts(struct obd_device *obd, int tgt_count,
  44                            obd_uuid_t *uuidarray);
  45 extern int mds_get_lovdesc(struct obd_device *obd, struct lov_desc *desc);
  46 extern int mds_update_last_rcvd(struct mds_obd *mds, void *handle,
  47                                 struct ptlrpc_request *req);
  48 static int mds_cleanup(struct obd_device * obddev);
  49
  50 inline struct mds_obd *mds_req2mds(struct ptlrpc_request *req)
  51 {
  52         return &req->rq_export->exp_obd->u.mds;
  53 }
  54
  55 static int mds_bulk_timeout(void *data)
  56 {
  57         struct ptlrpc_bulk_desc *desc = data;
  58
  59         ENTRY;
  60         CERROR("(not yet) starting recovery of client %p\n", desc->bd_client);
  61         RETURN(1);
  62 }
  63
  64 /* Assumes caller has already pushed into the kernel filesystem context */
  65 static int mds_sendpage(struct ptlrpc_request *req, struct file *file,
  66                         __u64 offset)
  67 {
  68         int rc = 0;
  69         struct mds_obd *mds = mds_req2mds(req);
  70         struct ptlrpc_bulk_desc *desc;
  71         struct ptlrpc_bulk_page *bulk;
  72         struct l_wait_info lwi;
  73         char *buf;
  74         ENTRY;
  75
  76         desc = ptlrpc_prep_bulk(req->rq_connection);
  77         if (desc == NULL)
  78                 GOTO(out, rc = -ENOMEM);
  79
  80         bulk = ptlrpc_prep_bulk_page(desc);
  81         if (bulk == NULL)
  82                 GOTO(cleanup_bulk, rc = -ENOMEM);
  83
  84         OBD_ALLOC(buf, PAGE_SIZE);
  85         if (buf == NULL)
  86                 GOTO(cleanup_bulk, rc = -ENOMEM);
  87
  88         rc = mds_fs_readpage(mds, file, buf, PAGE_SIZE, (loff_t *)&offset);
  89
  90         if (rc != PAGE_SIZE)
  91                 GOTO(cleanup_buf, rc = -EIO);
  92
  93         bulk->bp_xid = req->rq_xid;
  94         bulk->bp_buf = buf;
  95         bulk->bp_buflen = PAGE_SIZE;
  96         desc->bd_portal = MDS_BULK_PORTAL;
  97
  98         rc = ptlrpc_send_bulk(desc);
  99         if (rc)
 100                 GOTO(cleanup_buf, rc);
 101
 102         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
 103                 CERROR("obd_fail_loc=%x, fail operation rc=%d\n",
 104                        OBD_FAIL_MDS_SENDPAGE, rc);
 105                 ptlrpc_abort_bulk(desc);
 106                 GOTO(cleanup_buf, rc);
 107         }
 108
 109         lwi = LWI_TIMEOUT(obd_timeout * HZ, mds_bulk_timeout, desc);
 110         rc = l_wait_event(desc->bd_waitq, desc->bd_flags & PTL_BULK_FL_SENT, &lwi);
 111         if (rc) {
 112                 if (rc != -ETIMEDOUT)
 113                         LBUG();
 114                 GOTO(cleanup_buf, rc);
 115         }
 116
 117         EXIT;
 118  cleanup_buf:
 119         OBD_FREE(buf, PAGE_SIZE);
 120  cleanup_bulk:
 121         ptlrpc_free_bulk(desc);
 122  out:
 123         return rc;
 124 }
 125
 126 /*
 127  * Look up a named entry in a directory, and get an LDLM lock on it.
 128  * 'dir' is a inode for which an LDLM lock has already been taken.
 129  *
 130  * If we do not need an exclusive or write lock on this entry (e.g.
 131  * a read lock for attribute lookup only) then we do not hold the
 132  * directory on return.  It is up to the caller to know what type
 133  * of lock it is getting, and clean up appropriately.
 134  */
 135 struct dentry *mds_name2locked_dentry(struct obd_device *obd,
 136                                       struct dentry *dir, struct vfsmount **mnt,
 137                                       char *name, int namelen, int lock_mode,
 138                                       struct lustre_handle *lockh,
 139                                       int dir_lock_mode)
 140 {
 141         struct dentry *dchild;
 142         int flags, rc;
 143         __u64 res_id[3] = {0};
 144         ENTRY;
 145
 146         down(&dir->d_inode->i_sem);
 147         dchild = lookup_one_len(name, dir, namelen);
 148         if (IS_ERR(dchild)) {
 149                 CERROR("child lookup error %ld\n", PTR_ERR(dchild));
 150                 up(&dir->d_inode->i_sem);
 151                 LBUG();
 152                 RETURN(dchild);
 153         }
 154         if (dir_lock_mode != LCK_EX && dir_lock_mode != LCK_PW) {
 155                 up(&dir->d_inode->i_sem);
 156                 ldlm_lock_decref(lockh, dir_lock_mode);
 157         }
 158
 159         if (lock_mode == 0 || !dchild->d_inode)
 160                 RETURN(dchild);
 161
 162         res_id[0] = dchild->d_inode->i_ino;
 163         rc = ldlm_match_or_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 164                                    res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 165                                    &flags, ldlm_completion_ast,
 166                                    mds_blocking_ast, NULL, 0, lockh);
 167         if (rc != ELDLM_OK) {
 168                 l_dput(dchild);
 169                 up(&dir->d_inode->i_sem);
 170                 RETURN(ERR_PTR(-ENOLCK)); /* XXX translate ldlm code */
 171         }
 172
 173         RETURN(dchild);
 174 }
 175
 176 struct dentry *mds_fid2locked_dentry(struct obd_device *obd, struct ll_fid *fid,
 177                                      struct vfsmount **mnt, int lock_mode,
 178                                      struct lustre_handle *lockh)
 179 {
 180         struct mds_obd *mds = &obd->u.mds;
 181         struct dentry *de = mds_fid2dentry(mds, fid, mnt), *retval = de;
 182         int flags, rc;
 183         __u64 res_id[3] = {0};
 184         ENTRY;
 185
 186         if (IS_ERR(de))
 187                 RETURN(de);
 188
 189         res_id[0] = de->d_inode->i_ino;
 190         rc = ldlm_match_or_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 191                                    res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 192                                    &flags, ldlm_completion_ast,
 193                                    mds_blocking_ast, NULL, 0, lockh);
 194         if (rc != ELDLM_OK) {
 195                 l_dput(de);
 196                 retval = ERR_PTR(-ENOLCK); /* XXX translate ldlm code */
 197         }
 198
 199         RETURN(retval);
 200 }
 201
 202 #ifndef DCACHE_DISCONNECTED
 203 #define DCACHE_DISCONNECTED DCACHE_NFSD_DISCONNECTED
 204 #endif
 205
 206 /* Look up an entry by inode number. */
 207 struct dentry *mds_fid2dentry(struct mds_obd *mds, struct ll_fid *fid,
 208                               struct vfsmount **mnt)
 209 {
 210         /* stolen from NFS */
 211         struct super_block *sb = mds->mds_sb;
 212         unsigned long ino = fid->id;
 213         __u32 generation = fid->generation;
 214         struct inode *inode;
 215         struct list_head *lp;
 216         struct dentry *result;
 217
 218         if (ino == 0)
 219                 RETURN(ERR_PTR(-ESTALE));
 220
 221         inode = iget(sb, ino);
 222         if (inode == NULL)
 223                 RETURN(ERR_PTR(-ENOMEM));
 224
 225         CDEBUG(D_DENTRY, "--> mds_fid2dentry: sb %p\n", inode->i_sb);
 226
 227         if (is_bad_inode(inode) ||
 228             (generation && inode->i_generation != generation)) {
 229                 /* we didn't find the right inode.. */
 230                 CERROR("bad inode %lu, link: %d ct: %d or version  %u/%u\n",
 231                        inode->i_ino, inode->i_nlink,
 232                        atomic_read(&inode->i_count), inode->i_generation,
 233                        generation);
 234                 LBUG();
 235                 iput(inode);
 236                 RETURN(ERR_PTR(-ESTALE));
 237         }
 238
 239         /* now to find a dentry. If possible, get a well-connected one */
 240         if (mnt)
 241                 *mnt = mds->mds_vfsmnt;
 242         spin_lock(&dcache_lock);
 243         list_for_each(lp, &inode->i_dentry) {
 244                 result = list_entry(lp, struct dentry, d_alias);
 245                 if (!(result->d_flags & DCACHE_DISCONNECTED)) {
 246                         dget_locked(result);
 247                         result->d_vfs_flags |= DCACHE_REFERENCED;
 248                         spin_unlock(&dcache_lock);
 249                         iput(inode);
 250                         if (mnt)
 251                                 mntget(*mnt);
 252                         return result;
 253                 }
 254         }
 255         spin_unlock(&dcache_lock);
 256         result = d_alloc_root(inode);
 257         if (result == NULL) {
 258                 iput(inode);
 259                 return ERR_PTR(-ENOMEM);
 260         }
 261         if (mnt)
 262                 mntget(*mnt);
 263         result->d_flags |= DCACHE_DISCONNECTED;
 264         return result;
 265 }
 266
 267 /* Establish a connection to the MDS.
 268  *
 269  * This will set up an export structure for the client to hold state data
 270  * about that client, like open files, the last operation number it did
 271  * on the server, etc.
 272  */
 273 static int mds_connect(struct lustre_handle *conn, struct obd_device *obd,
 274                        obd_uuid_t cluuid, struct recovd_obd *recovd,
 275                        ptlrpc_recovery_cb_t recover)
 276 {
 277         struct obd_export *exp;
 278         struct mds_export_data *med;
 279         struct mds_client_data *mcd;
 280         struct list_head *p;
 281         int rc;
 282         ENTRY;
 283
 284         if (!conn || !obd || !cluuid)
 285                 RETURN(-EINVAL);
 286
 287         MOD_INC_USE_COUNT;
 288
 289         spin_lock(&obd->obd_dev_lock);
 290         list_for_each(p, &obd->obd_exports) {
 291                 exp = list_entry(p, struct obd_export, exp_obd_chain);
 292                 mcd = exp->exp_mds_data.med_mcd;
 293                 if (!memcmp(cluuid, mcd->mcd_uuid, sizeof(mcd->mcd_uuid))) {
 294                         LASSERT(exp->exp_obd == obd);
 295
 296                         if (!list_empty(&exp->exp_conn_chain)) {
 297                                 CERROR("existing uuid/export, list not empty!\n");
 298                                 spin_unlock(&obd->obd_dev_lock);
 299                                 /* XXX should we MOD_DEC_USE_COUNT; here? */
 300                                 RETURN(-EALREADY);
 301                         }
 302                         conn->addr = (__u64) (unsigned long)exp;
 303                         conn->cookie = exp->exp_cookie;
 304                         spin_unlock(&obd->obd_dev_lock);
 305                         CDEBUG(D_INFO, "existing export for UUID '%s' at %p\n",
 306                                cluuid, exp);
 307                         CDEBUG(D_IOCTL,"connect: addr %Lx cookie %Lx\n",
 308                                (long long)conn->addr, (long long)conn->cookie);
 309                         MOD_DEC_USE_COUNT;
 310                         RETURN(0);
 311                 }
 312         }
 313         spin_unlock(&obd->obd_dev_lock);
 314         /* XXX There is a small race between checking the list and adding a
 315          * new connection for the same UUID, but the real threat (list
 316          * corruption when multiple different clients connect) is solved.
 317          */
 318         rc = class_connect(conn, obd, cluuid);
 319         if (rc)
 320                 GOTO(out_dec, rc);
 321         exp = class_conn2export(conn);
 322         LASSERT(exp);
 323         med = &exp->exp_mds_data;
 324
 325         OBD_ALLOC(mcd, sizeof(*mcd));
 326         if (!mcd) {
 327                 CERROR("mds: out of memory for client data\n");
 328                 GOTO(out_export, rc = -ENOMEM);
 329         }
 330
 331         memcpy(mcd->mcd_uuid, cluuid, sizeof(mcd->mcd_uuid));
 332         med->med_mcd = mcd;
 333
 334         INIT_LIST_HEAD(&med->med_open_head);
 335         spin_lock_init(&med->med_open_lock);
 336
 337         rc = mds_client_add(med, -1);
 338         if (rc)
 339                 GOTO(out_mdc, rc);
 340
 341         RETURN(0);
 342
 343 out_mdc:
 344         OBD_FREE(mcd, sizeof(*mcd));
 345 out_export:
 346         class_disconnect(conn);
 347 out_dec:
 348         MOD_DEC_USE_COUNT;
 349
 350         return rc;
 351 }
 352
 353 static int mds_disconnect(struct lustre_handle *conn)
 354 {
 355         struct obd_export *export = class_conn2export(conn);
 356         int rc;
 357         ENTRY;
 358
 359 #warning "Mike: we need to close all files opened on med_open_head"
 360         ldlm_cancel_locks_for_export(export);
 361         mds_client_free(export);
 362
 363         rc = class_disconnect(conn);
 364         if (!rc)
 365                 MOD_DEC_USE_COUNT;
 366
 367         RETURN(rc);
 368 }
 369
 370 static int mds_getstatus(struct ptlrpc_request *req)
 371 {
 372         struct mds_obd *mds = mds_req2mds(req);
 373         struct mds_body *body;
 374         int rc, size = sizeof(*body);
 375         ENTRY;
 376
 377         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 378         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK)) {
 379                 CERROR("mds: out of memory for message: size=%d\n", size);
 380                 req->rq_status = -ENOMEM;
 381                 RETURN(0);
 382         }
 383
 384         /* Anything we need to do here with the client's trans no or so? */
 385         body = lustre_msg_buf(req->rq_repmsg, 0);
 386         memcpy(&body->fid1, &mds->mds_rootfid, sizeof(body->fid1));
 387
 388         /* the last_committed and last_xid fields are filled in for all
 389          * replies already - no need to do so here also.
 390          */
 391         RETURN(0);
 392 }
 393
 394 static int mds_getlovinfo(struct ptlrpc_request *req)
 395 {
 396         struct mds_obd *mds = mds_req2mds(req);
 397         struct mds_status_req *streq;
 398         struct lov_desc *desc;
 399         int tgt_count;
 400         int rc, size[2] = {sizeof(*desc)};
 401         ENTRY;
 402
 403         streq = lustre_msg_buf(req->rq_reqmsg, 0);
 404         streq->flags = NTOH__u32(streq->flags);
 405         streq->repbuf = NTOH__u32(streq->repbuf);
 406         size[1] = streq->repbuf;
 407
 408         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 409         if (rc) {
 410                 CERROR("mds: out of memory for message: size=%d\n", size[1]);
 411                 req->rq_status = -ENOMEM;
 412                 RETURN(0);
 413         }
 414
 415         desc = lustre_msg_buf(req->rq_repmsg, 0);
 416         rc = mds_get_lovdesc(req->rq_obd, desc);
 417         if (rc) {
 418                 CERROR("mds_get_lovdesc error %d", rc);
 419                 req->rq_status = rc;
 420                 RETURN(0);
 421         }
 422
 423         tgt_count = le32_to_cpu(desc->ld_tgt_count);
 424         if (tgt_count * sizeof(obd_uuid_t) > streq->repbuf) {
 425                 CERROR("too many targets, enlarge client buffers\n");
 426                 req->rq_status = -ENOSPC;
 427                 RETURN(0);
 428         }
 429
 430         mds->mds_max_mdsize = sizeof(struct lov_mds_md) +
 431                 tgt_count * sizeof(struct lov_object_id);
 432         rc = mds_get_lovtgts(req->rq_obd, tgt_count,
 433                              lustre_msg_buf(req->rq_repmsg, 1));
 434         if (rc) {
 435                 CERROR("get_lovtgts error %d\n", rc);
 436                 req->rq_status = rc;
 437                 RETURN(0);
 438         }
 439         RETURN(0);
 440 }
 441
 442 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 443                      void *data, __u32 data_len, int flag)
 444 {
 445         int do_ast;
 446         ENTRY;
 447
 448         if (flag == LDLM_CB_CANCELING) {
 449                 /* Don't need to do anything here. */
 450                 RETURN(0);
 451         }
 452
 453         /* XXX layering violation!  -phil */
 454         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 455         lock->l_flags |= LDLM_FL_CBPENDING;
 456         do_ast = (!lock->l_readers && !lock->l_writers);
 457         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 458
 459         if (do_ast) {
 460                 struct lustre_handle lockh;
 461                 int rc;
 462
 463                 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
 464                 ldlm_lock2handle(lock, &lockh);
 465                 rc = ldlm_cli_cancel(&lockh);
 466                 if (rc < 0)
 467                         CERROR("ldlm_cli_cancel: %d\n", rc);
 468         } else
 469                 LDLM_DEBUG(lock, "Lock still has references, will be"
 470                            "cancelled later");
 471         RETURN(0);
 472 }
 473
 474 static int mds_getattr_internal(struct mds_obd *mds, struct dentry *dentry,
 475                                 struct ptlrpc_request *req,
 476                                 struct mds_body *reqbody, int reply_off)
 477 {
 478         struct mds_body *body;
 479         struct inode *inode = dentry->d_inode;
 480         int rc;
 481         ENTRY;
 482
 483         if (inode == NULL)
 484                 RETURN(-ENOENT);
 485
 486         body = lustre_msg_buf(req->rq_repmsg, reply_off);
 487
 488         mds_pack_inode2fid(&body->fid1, inode);
 489         mds_pack_inode2body(body, inode);
 490
 491         if (S_ISREG(inode->i_mode)) {
 492                 struct lov_mds_md *lmm;
 493
 494                 lmm = lustre_msg_buf(req->rq_repmsg, reply_off + 1);
 495                 lmm->lmm_easize = mds->mds_max_mdsize;
 496                 rc = mds_fs_get_md(mds, inode, lmm);
 497
 498                 if (rc < 0) {
 499                         if (rc == -ENODATA)
 500                                 RETURN(0);
 501                         CERROR("mds_fs_get_md failed: %d\n", rc);
 502                         RETURN(rc);
 503                 }
 504                 body->valid |= OBD_MD_FLEASIZE;
 505         } else if (S_ISLNK(inode->i_mode) && reqbody->valid & OBD_MD_LINKNAME) {
 506                 char *symname = lustre_msg_buf(req->rq_repmsg, reply_off + 1);
 507                 int len = req->rq_repmsg->buflens[reply_off + 1];
 508
 509                 rc = inode->i_op->readlink(dentry, symname, len);
 510                 if (rc < 0) {
 511                         CERROR("readlink failed: %d\n", rc);
 512                         RETURN(rc);
 513                 } else
 514                         CDEBUG(D_INODE, "read symlink dest %s\n", symname);
 515
 516                 body->valid |= OBD_MD_LINKNAME;
 517         }
 518         RETURN(0);
 519 }
 520
 521 static int mds_getattr_name(int offset, struct ptlrpc_request *req)
 522 {
 523         struct mds_obd *mds = mds_req2mds(req);
 524         struct obd_device *obd = req->rq_export->exp_obd;
 525         struct obd_run_ctxt saved;
 526         struct mds_body *body;
 527         struct dentry *de = NULL, *dchild = NULL;
 528         struct inode *dir;
 529         struct lustre_handle lockh;
 530         char *name;
 531         int namelen, flags, lock_mode, rc = 0;
 532         struct obd_ucred uc;
 533         __u64 res_id[3] = {0, 0, 0};
 534         ENTRY;
 535
 536         LASSERT(!strcmp(req->rq_export->exp_obd->obd_type->typ_name, "mds"));
 537
 538         if (req->rq_reqmsg->bufcount <= offset + 1) {
 539                 LBUG();
 540                 GOTO(out_pre_de, rc = -EINVAL);
 541         }
 542
 543         body = lustre_msg_buf(req->rq_reqmsg, offset);
 544         name = lustre_msg_buf(req->rq_reqmsg, offset + 1);
 545         namelen = req->rq_reqmsg->buflens[offset + 1];
 546         /* requests were at offset 2, replies go back at 1 */
 547         if (offset)
 548                 offset = 1;
 549
 550         uc.ouc_fsuid = body->fsuid;
 551         uc.ouc_fsgid = body->fsgid;
 552         push_ctxt(&saved, &mds->mds_ctxt, &uc);
 553         de = mds_fid2dentry(mds, &body->fid1, NULL);
 554         if (IS_ERR(de)) {
 555                 LBUG();
 556                 GOTO(out_pre_de, rc = -ESTALE);
 557         }
 558
 559         dir = de->d_inode;
 560         CDEBUG(D_INODE, "parent ino %ld, name %*s\n", dir->i_ino,namelen,name);
 561
 562         lock_mode = (req->rq_reqmsg->opc == MDS_REINT) ? LCK_CW : LCK_PW;
 563         res_id[0] = dir->i_ino;
 564
 565         rc = ldlm_lock_match(obd->obd_namespace, res_id, LDLM_PLAIN,
 566                              NULL, 0, lock_mode, &lockh);
 567         if (rc == 0) {
 568                 LDLM_DEBUG_NOLOCK("enqueue res "LPU64, res_id[0]);
 569                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 570                                       res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 571                                       &flags, ldlm_completion_ast,
 572                                       mds_blocking_ast, NULL, 0, &lockh);
 573                 if (rc != ELDLM_OK) {
 574                         CERROR("lock enqueue: err: %d\n", rc);
 575                         GOTO(out_create_de, rc = -EIO);
 576                 }
 577         }
 578         ldlm_lock_dump((void *)(unsigned long)lockh.addr);
 579
 580         down(&dir->i_sem);
 581         dchild = lookup_one_len(name, de, namelen - 1);
 582         if (IS_ERR(dchild)) {
 583                 CDEBUG(D_INODE, "child lookup error %ld\n", PTR_ERR(dchild));
 584                 up(&dir->i_sem);
 585                 LBUG();
 586                 GOTO(out_create_dchild, rc = -ESTALE);
 587         }
 588
 589         rc = mds_getattr_internal(mds, dchild, req, body, offset);
 590
 591         EXIT;
 592 out_create_dchild:
 593         l_dput(dchild);
 594         up(&dir->i_sem);
 595         ldlm_lock_decref(&lockh, lock_mode);
 596 out_create_de:
 597         l_dput(de);
 598 out_pre_de:
 599         req->rq_status = rc;
 600         pop_ctxt(&saved);
 601         return 0;
 602 }
 603
 604 static int mds_getattr(int offset, struct ptlrpc_request *req)
 605 {
 606         struct mds_obd *mds = mds_req2mds(req);
 607         struct obd_run_ctxt saved;
 608         struct dentry *de;
 609         struct inode *inode;
 610         struct mds_body *body;
 611         struct obd_ucred uc;
 612         int rc = 0, size[2] = {sizeof(*body)}, bufcount = 1;
 613         ENTRY;
 614
 615         body = lustre_msg_buf(req->rq_reqmsg, offset);
 616         uc.ouc_fsuid = body->fsuid;
 617         uc.ouc_fsgid = body->fsgid;
 618         push_ctxt(&saved, &mds->mds_ctxt, &uc);
 619         de = mds_fid2dentry(mds, &body->fid1, NULL);
 620         if (IS_ERR(de)) {
 621                 rc = req->rq_status = -ENOENT;
 622                 GOTO(out_pop, PTR_ERR(de));
 623         }
 624
 625         inode = de->d_inode;
 626         if (S_ISREG(body->fid1.f_type)) {
 627                 bufcount = 2;
 628                 size[1] = mds->mds_max_mdsize;
 629         } else if (body->valid & OBD_MD_LINKNAME) {
 630                 bufcount = 2;
 631                 size[1] = MIN(inode->i_size + 1, body->size);
 632                 CDEBUG(D_INODE, "symlink size: %d, reply space: %d\n",
 633                        inode->i_size + 1, body->size);
 634         }
 635
 636         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK)) {
 637                 CERROR("failed GETATTR_PACK test\n");
 638                 req->rq_status = -ENOMEM;
 639                 GOTO(out, rc = -ENOMEM);
 640         }
 641
 642         rc = lustre_pack_msg(bufcount, size, NULL, &req->rq_replen,
 643                              &req->rq_repmsg);
 644         if (rc) {
 645                 CERROR("out of memory or FAIL_MDS_GETATTR_PACK\n");
 646                 req->rq_status = rc;
 647                 GOTO(out, rc);
 648         }
 649
 650         req->rq_status = mds_getattr_internal(mds, de, req, body, 0);
 651
 652 out:
 653         l_dput(de);
 654 out_pop:
 655         pop_ctxt(&saved);
 656         RETURN(rc);
 657 }
 658
 659 static int mds_statfs(struct ptlrpc_request *req)
 660 {
 661         struct mds_obd *mds = mds_req2mds(req);
 662         struct obd_statfs *osfs;
 663         struct statfs sfs;
 664         int rc, size = sizeof(*osfs);
 665         ENTRY;
 666
 667         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
 668                              &req->rq_repmsg);
 669         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK)) {
 670                 CERROR("mds: statfs lustre_pack_msg failed: rc = %d\n", rc);
 671                 GOTO(out, rc);
 672         }
 673
 674         rc = vfs_statfs(mds->mds_sb, &sfs);
 675         if (rc) {
 676                 CERROR("mds: statfs failed: rc %d\n", rc);
 677                 GOTO(out, rc);
 678         }
 679         osfs = lustre_msg_buf(req->rq_repmsg, 0);
 680         memset(osfs, 0, size);
 681         statfs_pack(osfs, &sfs);
 682         obd_statfs_pack(osfs, osfs);
 683
 684 out:
 685         req->rq_status = rc;
 686         RETURN(0);
 687 }
 688
 689 static struct mds_file_data *mds_handle2mfd(struct lustre_handle *handle)
 690 {
 691         struct mds_file_data *mfd = NULL;
 692
 693         if (!handle || !handle->addr)
 694                 RETURN(NULL);
 695
 696         mfd = (struct mds_file_data *)(unsigned long)(handle->addr);
 697         if (!kmem_cache_validate(mds_file_cache, mfd))
 698                 RETURN(NULL);
 699
 700         if (mfd->mfd_servercookie != handle->cookie)
 701                 RETURN(NULL);
 702
 703         return mfd;
 704 }
 705
 706 static int mds_store_ea(struct mds_obd *mds, struct ptlrpc_request *req,
 707                         struct mds_body *body, struct dentry *de,
 708                         struct lov_mds_md *lmm)
 709 {
 710         struct obd_run_ctxt saved;
 711         struct obd_ucred uc;
 712         void *handle;
 713         int rc, rc2;
 714
 715         uc.ouc_fsuid = body->fsuid;
 716         uc.ouc_fsgid = body->fsgid;
 717         push_ctxt(&saved, &mds->mds_ctxt, &uc);
 718         handle = mds_fs_start(mds, de->d_inode, MDS_FSOP_SETATTR);
 719         if (!handle)
 720                 GOTO(out_ea, rc = -ENOMEM);
 721
 722         rc = mds_fs_set_md(mds, de->d_inode, handle, lmm);
 723         if (!rc)
 724                 rc = mds_update_last_rcvd(mds, handle, req);
 725
 726         rc2 = mds_fs_commit(mds, de->d_inode, handle);
 727         if (rc2 && !rc)
 728                 rc = rc2;
 729 out_ea:
 730         pop_ctxt(&saved);
 731
 732         return rc;
 733 }
 734
 735 static int mds_open(struct ptlrpc_request *req)
 736 {
 737         struct mds_obd *mds = mds_req2mds(req);
 738         struct mds_body *body;
 739         struct mds_export_data *med;
 740         struct mds_file_data *mfd;
 741         struct dentry *de;
 742         struct file *file;
 743         struct vfsmount *mnt;
 744         __u32 flags;
 745         struct list_head *tmp;
 746         int rc, size = sizeof(*body);
 747         ENTRY;
 748
 749         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK)) {
 750                 CERROR("test case OBD_FAIL_MDS_OPEN_PACK\n");
 751                 req->rq_status = -ENOMEM;
 752                 RETURN(-ENOMEM);
 753         }
 754
 755         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 756         if (rc) {
 757                 CERROR("mds: pack error: rc = %d\n", rc);
 758                 req->rq_status = rc;
 759                 RETURN(rc);
 760         }
 761
 762         body = lustre_msg_buf(req->rq_reqmsg, 0);
 763
 764         /* was this animal open already and the client lost the reply? */
 765         /* XXX need some way to detect a reopen, to avoid locked list walks */
 766         med = &req->rq_export->exp_mds_data;
 767         spin_lock(&med->med_open_lock);
 768         list_for_each(tmp, &med->med_open_head) {
 769                 mfd = list_entry(tmp, typeof(*mfd), mfd_list);
 770                 if (!memcmp(&mfd->mfd_clienthandle, &body->handle,
 771                             sizeof(mfd->mfd_clienthandle)) &&
 772                     body->fid1.id == mfd->mfd_file->f_dentry->d_inode->i_ino) {
 773                         de = mfd->mfd_file->f_dentry;
 774                         spin_unlock(&med->med_open_lock);
 775                         CERROR("Re opening "LPD64"\n", body->fid1.id);
 776                         GOTO(out_pack, rc = 0);
 777                 }
 778         }
 779         spin_unlock(&med->med_open_lock);
 780
 781         mfd = kmem_cache_alloc(mds_file_cache, GFP_KERNEL);
 782         if (!mfd) {
 783                 CERROR("mds: out of memory\n");
 784                 req->rq_status = -ENOMEM;
 785                 RETURN(0);
 786         }
 787
 788         de = mds_fid2dentry(mds, &body->fid1, &mnt);
 789         if (IS_ERR(de))
 790                 GOTO(out_free, rc = PTR_ERR(de));
 791
 792         /* check if this inode has seen a delayed object creation */
 793         if (req->rq_reqmsg->bufcount > 1) {
 794                 struct lov_mds_md *lmm = lustre_msg_buf(req->rq_reqmsg, 1);
 795
 796                 rc = mds_store_ea(mds, req, body, de, lmm);
 797                 if (rc) {
 798                         l_dput(de);
 799                         mntput(mnt);
 800                         GOTO(out_free, rc);
 801                 }
 802         }
 803
 804         flags = body->flags;
 805         /* dentry_open does a dput(de) and mntput(mnt) on error */
 806         file = dentry_open(de, mnt, flags & ~O_DIRECT);
 807         if (IS_ERR(file)) {
 808                 rc = PTR_ERR(file);
 809                 GOTO(out_free, 0);
 810         }
 811
 812         file->private_data = mfd;
 813         mfd->mfd_file = file;
 814         memcpy(&mfd->mfd_clienthandle, &body->handle, sizeof(body->handle));
 815         get_random_bytes(&mfd->mfd_servercookie, sizeof(mfd->mfd_servercookie));
 816         spin_lock(&med->med_open_lock);
 817         list_add(&mfd->mfd_list, &med->med_open_head);
 818         spin_unlock(&med->med_open_lock);
 819
 820 out_pack:
 821         body = lustre_msg_buf(req->rq_repmsg, 0);
 822         mds_pack_inode2fid(&body->fid1, de->d_inode);
 823         mds_pack_inode2body(body, de->d_inode);
 824         body->handle.addr = (__u64)(unsigned long)mfd;
 825         body->handle.cookie = mfd->mfd_servercookie;
 826         CDEBUG(D_INODE, "llite file "LPX64": addr %p, cookie "LPX64"\n",
 827                mfd->mfd_clienthandle.addr, mfd, mfd->mfd_servercookie);
 828         RETURN(0);
 829
 830 out_free:
 831         mfd->mfd_servercookie = DEAD_HANDLE_MAGIC;
 832         kmem_cache_free(mds_file_cache, mfd);
 833         req->rq_status = rc;
 834         RETURN(0);
 835 }
 836
 837 static int mds_close(struct ptlrpc_request *req)
 838 {
 839         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 840         struct mds_body *body;
 841         struct file *file;
 842         struct mds_file_data *mfd;
 843         int rc;
 844         ENTRY;
 845
 846         body = lustre_msg_buf(req->rq_reqmsg, 0);
 847
 848         mfd = mds_handle2mfd(&body->handle);
 849         if (!mfd) {
 850                 CERROR("no handle for file close "LPD64
 851                        ": addr "LPX64", cookie "LPX64"\n",
 852                        body->fid1.id, body->handle.addr, body->handle.cookie);
 853                 RETURN(-ESTALE);
 854         }
 855
 856         file = mfd->mfd_file;
 857         LASSERT(file->private_data == mfd);
 858
 859         spin_lock(&med->med_open_lock);
 860         list_del(&mfd->mfd_list);
 861         spin_unlock(&med->med_open_lock);
 862         mfd->mfd_servercookie = DEAD_HANDLE_MAGIC;
 863         kmem_cache_free(mds_file_cache, mfd);
 864
 865         req->rq_status = filp_close(file, 0);
 866
 867         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK)) {
 868                 CERROR("test case OBD_FAIL_MDS_CLOSE_PACK\n");
 869                 req->rq_status = -ENOMEM;
 870                 RETURN(-ENOMEM);
 871         }
 872
 873         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 874         if (rc) {
 875                 CERROR("mds: lustre_pack_msg: rc = %d\n", rc);
 876                 req->rq_status = rc;
 877         }
 878
 879         RETURN(0);
 880 }
 881
 882 static int mds_readpage(struct ptlrpc_request *req)
 883 {
 884         struct mds_obd *mds = mds_req2mds(req);
 885         struct vfsmount *mnt;
 886         struct dentry *de;
 887         struct file *file;
 888         struct mds_body *body, *repbody;
 889         struct obd_run_ctxt saved;
 890         int rc, size = sizeof(*body);
 891         struct obd_ucred uc;
 892         ENTRY;
 893
 894         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 895         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK)) {
 896                 CERROR("mds: out of memory\n");
 897                 GOTO(out, rc = -ENOMEM);
 898         }
 899
 900         body = lustre_msg_buf(req->rq_reqmsg, 0);
 901         uc.ouc_fsuid = body->fsuid;
 902         uc.ouc_fsgid = body->fsgid;
 903         push_ctxt(&saved, &mds->mds_ctxt, &uc);
 904         de = mds_fid2dentry(mds, &body->fid1, &mnt);
 905         if (IS_ERR(de))
 906                 GOTO(out_pop, rc = PTR_ERR(de));
 907
 908         CDEBUG(D_INODE, "ino %ld\n", de->d_inode->i_ino);
 909
 910         file = dentry_open(de, mnt, O_RDONLY | O_LARGEFILE);
 911         /* note: in case of an error, dentry_open puts dentry */
 912         if (IS_ERR(file))
 913                 GOTO(out_pop, rc = PTR_ERR(file));
 914
 915         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 916         repbody->size = file->f_dentry->d_inode->i_size;
 917         repbody->valid = OBD_MD_FLSIZE;
 918
 919         /* to make this asynchronous make sure that the handling function
 920            doesn't send a reply when this function completes. Instead a
 921            callback function would send the reply */
 922         /* note: in case of an error, dentry_open puts dentry */
 923         rc = mds_sendpage(req, file, body->size);
 924
 925         filp_close(file, 0);
 926 out_pop:
 927         pop_ctxt(&saved);
 928 out:
 929         req->rq_status = rc;
 930         RETURN(0);
 931 }
 932
 933 int mds_reint(int offset, struct ptlrpc_request *req)
 934 {
 935         int rc;
 936         struct mds_update_record rec;
 937
 938         rc = mds_update_unpack(req, offset, &rec);
 939         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNPACK)) {
 940                 CERROR("invalid record\n");
 941                 req->rq_status = -EINVAL;
 942                 RETURN(0);
 943         }
 944         /* rc will be used to interrupt a for loop over multiple records */
 945         rc = mds_reint_rec(&rec, offset, req);
 946         return rc;
 947 }
 948
 949 int mds_handle(struct ptlrpc_request *req)
 950 {
 951         int rc;
 952         ENTRY;
 953
 954         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 955         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_HANDLE_UNPACK)) {
 956                 CERROR("lustre_mds: Invalid request\n");
 957                 GOTO(out, rc);
 958         }
 959
 960         if (req->rq_reqmsg->opc != MDS_CONNECT && req->rq_export == NULL)
 961                 GOTO(out, rc = -ENOTCONN);
 962
 963         LASSERT(!strcmp(req->rq_obd->obd_type->typ_name, "mds"));
 964
 965         switch (req->rq_reqmsg->opc) {
 966         case MDS_CONNECT:
 967                 CDEBUG(D_INODE, "connect\n");
 968                 OBD_FAIL_RETURN(OBD_FAIL_MDS_CONNECT_NET, 0);
 969                 rc = target_handle_connect(req);
 970                 break;
 971
 972         case MDS_DISCONNECT:
 973                 CDEBUG(D_INODE, "disconnect\n");
 974                 OBD_FAIL_RETURN(OBD_FAIL_MDS_DISCONNECT_NET, 0);
 975                 rc = target_handle_disconnect(req);
 976                 goto out;
 977
 978         case MDS_GETSTATUS:
 979                 CDEBUG(D_INODE, "getstatus\n");
 980                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETSTATUS_NET, 0);
 981                 rc = mds_getstatus(req);
 982                 break;
 983
 984         case MDS_GETLOVINFO:
 985                 CDEBUG(D_INODE, "getlovinfo\n");
 986                 rc = mds_getlovinfo(req);
 987                 break;
 988
 989         case MDS_GETATTR:
 990                 CDEBUG(D_INODE, "getattr\n");
 991                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETATTR_NET, 0);
 992                 rc = mds_getattr(0, req);
 993                 break;
 994
 995         case MDS_STATFS:
 996                 CDEBUG(D_INODE, "statfs\n");
 997                 OBD_FAIL_RETURN(OBD_FAIL_MDS_STATFS_NET, 0);
 998                 rc = mds_statfs(req);
 999                 break;
1000
1001         case MDS_READPAGE:
1002                 CDEBUG(D_INODE, "readpage\n");
1003                 OBD_FAIL_RETURN(OBD_FAIL_MDS_READPAGE_NET, 0);
1004                 rc = mds_readpage(req);
1005
1006                 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1007                         return 0;
1008                 break;
1009
1010         case MDS_REINT: {
1011                 int size = sizeof(struct mds_body);
1012                 CDEBUG(D_INODE, "reint\n");
1013                 OBD_FAIL_RETURN(OBD_FAIL_MDS_REINT_NET, 0);
1014
1015                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
1016                                      &req->rq_repmsg);
1017                 if (rc) {
1018                         req->rq_status = rc;
1019                         break;
1020                 }
1021                 rc = mds_reint(0, req);
1022                 OBD_FAIL_RETURN(OBD_FAIL_MDS_REINT_NET_REP, 0);
1023                 break;
1024                 }
1025
1026         case MDS_OPEN:
1027                 CDEBUG(D_INODE, "open\n");
1028                 OBD_FAIL_RETURN(OBD_FAIL_MDS_OPEN_NET, 0);
1029                 rc = mds_open(req);
1030                 break;
1031
1032         case MDS_CLOSE:
1033                 CDEBUG(D_INODE, "close\n");
1034                 OBD_FAIL_RETURN(OBD_FAIL_MDS_CLOSE_NET, 0);
1035                 rc = mds_close(req);
1036                 break;
1037
1038         case LDLM_ENQUEUE:
1039                 CDEBUG(D_INODE, "enqueue\n");
1040                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
1041                 rc = ldlm_handle_enqueue(req);
1042                 if (rc)
1043                         break;
1044                 RETURN(0);
1045
1046         case LDLM_CONVERT:
1047                 CDEBUG(D_INODE, "convert\n");
1048                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
1049                 rc = ldlm_handle_convert(req);
1050                 if (rc)
1051                         break;
1052                 RETURN(0);
1053
1054         case LDLM_CANCEL:
1055                 CDEBUG(D_INODE, "cancel\n");
1056                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
1057                 rc = ldlm_handle_cancel(req);
1058                 if (rc)
1059                         break;
1060                 RETURN(0);
1061         case LDLM_BL_CALLBACK:
1062         case LDLM_CP_CALLBACK:
1063                 CDEBUG(D_INODE, "callback\n");
1064                 CERROR("callbacks should not happen on MDS\n");
1065                 LBUG();
1066                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
1067                 break;
1068         default:
1069                 rc = ptlrpc_error(req->rq_svc, req);
1070                 RETURN(rc);
1071         }
1072
1073         EXIT;
1074
1075         if (!rc) {
1076                 struct mds_export_data *med = &req->rq_export->exp_mds_data;
1077                 struct mds_obd *mds = mds_req2mds(req);
1078
1079                 req->rq_repmsg->last_xid =
1080                         HTON__u64(le64_to_cpu(med->med_mcd->mcd_last_xid));
1081                 req->rq_repmsg->last_committed =
1082                         HTON__u64(mds->mds_last_committed);
1083                 CDEBUG(D_INFO, "last_rcvd ~%Lu, last_committed %Lu, xid %d\n",
1084                        (unsigned long long)mds->mds_last_rcvd,
1085                        (unsigned long long)mds->mds_last_committed,
1086                        cpu_to_le32(req->rq_xid));
1087         }
1088  out:
1089         if (rc) {
1090                 CERROR("mds: processing error (opcode %d): %d\n",
1091                        req->rq_reqmsg->opc, rc);
1092                 ptlrpc_error(req->rq_svc, req);
1093         } else {
1094                 CDEBUG(D_NET, "sending reply\n");
1095                 ptlrpc_reply(req->rq_svc, req);
1096         }
1097         return 0;
1098 }
1099
1100 /* Update the server data on disk.  This stores the new mount_count and
1101  * also the last_rcvd value to disk.  If we don't have a clean shutdown,
1102  * then the server last_rcvd value may be less than that of the clients.
1103  * This will alert us that we may need to do client recovery.
1104  *
1105  * Assumes we are already in the server filesystem context.
1106  *
1107  * Also assumes for mds_last_rcvd that we are not modifying it (no locking).
1108  */
1109 static
1110 int mds_update_server_data(struct mds_obd *mds)
1111 {
1112         struct mds_server_data *msd = mds->mds_server_data;
1113         struct file *filp = mds->mds_rcvd_filp;
1114         loff_t off = 0;
1115         int rc;
1116
1117         msd->msd_last_rcvd = cpu_to_le64(mds->mds_last_rcvd);
1118         msd->msd_mount_count = cpu_to_le64(mds->mds_mount_count);
1119
1120         CDEBUG(D_SUPER, "MDS mount_count is %Lu, last_rcvd is %Lu\n",
1121                (unsigned long long)mds->mds_mount_count,
1122                (unsigned long long)mds->mds_last_rcvd);
1123         rc = lustre_fwrite(filp, (char *)msd, sizeof(*msd), &off);
1124         if (rc != sizeof(*msd)) {
1125                 CERROR("error writing MDS server data: rc = %d\n", rc);
1126                 if (rc > 0)
1127                         RETURN(-EIO);
1128                 RETURN(rc);
1129         }
1130 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
1131         rc = fsync_dev(filp->f_dentry->d_inode->i_rdev);
1132 #else
1133         rc = file_fsync(filp,  filp->f_dentry, 1);
1134 #endif
1135         if (rc)
1136                 CERROR("error flushing MDS server data: rc = %d\n", rc);
1137
1138         return 0;
1139 }
1140
1141 /* Do recovery actions for the MDS */
1142 static int mds_recover(struct obd_device *obddev)
1143 {
1144         struct mds_obd *mds = &obddev->u.mds;
1145         struct obd_run_ctxt saved;
1146         int rc;
1147
1148         /* This happens at the end when recovery is complete */
1149         ++mds->mds_mount_count;
1150         push_ctxt(&saved, &mds->mds_ctxt, NULL);
1151         rc = mds_update_server_data(mds);
1152         pop_ctxt(&saved);
1153
1154         return rc;
1155 }
1156
1157 #define MDS_NUM_THREADS 8
1158 /* mount the file system (secretly) */
1159 static int mds_setup(struct obd_device *obddev, obd_count len, void *buf)
1160 {
1161         int i;
1162         struct obd_ioctl_data* data = buf;
1163         struct mds_obd *mds = &obddev->u.mds;
1164         struct vfsmount *mnt;
1165         int rc = 0;
1166         ENTRY;
1167
1168         MOD_INC_USE_COUNT;
1169 #ifdef CONFIG_DEV_RDONLY
1170         dev_clear_rdonly(2);
1171 #endif
1172         if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2)
1173                 GOTO(err_dec, rc = -EINVAL);
1174
1175         mds->mds_fstype = strdup(data->ioc_inlbuf2);
1176
1177         mnt = do_kern_mount(mds->mds_fstype, 0, data->ioc_inlbuf1, NULL);
1178         if (IS_ERR(mnt)) {
1179                 rc = PTR_ERR(mnt);
1180                 CERROR("do_kern_mount failed: rc = %d\n", rc);
1181                 GOTO(err_kfree, rc);
1182         }
1183
1184         mds->mds_sb = mnt->mnt_root->d_inode->i_sb;
1185         if (!mds->mds_sb)
1186                 GOTO(err_put, rc = -ENODEV);
1187
1188         spin_lock_init(&mds->mds_last_lock);
1189         mds->mds_max_mdsize = sizeof(struct lov_mds_md);
1190         rc = mds_fs_setup(obddev, mnt);
1191         if (rc) {
1192                 CERROR("MDS filesystem method init failed: rc = %d\n", rc);
1193                 GOTO(err_put, rc);
1194         }
1195
1196         mds->mds_service = ptlrpc_init_svc(MDS_NEVENTS, MDS_NBUFS,
1197                                            MDS_BUFSIZE, MDS_MAXREQSIZE,
1198                                            MDS_REQUEST_PORTAL, MDC_REPLY_PORTAL,
1199                                            "self", mds_handle, "mds");
1200         if (!mds->mds_service) {
1201                 CERROR("failed to start service\n");
1202                 GOTO(err_fs, rc = -EINVAL);
1203         }
1204
1205         obddev->obd_namespace =
1206                 ldlm_namespace_new("mds_server", LDLM_NAMESPACE_SERVER);
1207         if (obddev->obd_namespace == NULL) {
1208                 mds_cleanup(obddev);
1209                 GOTO(err_svc, rc = -ENOMEM);
1210         }
1211
1212         for (i = 0; i < MDS_NUM_THREADS; i++) {
1213                 char name[32];
1214                 sprintf(name, "lustre_MDS_%02d", i);
1215                 rc = ptlrpc_start_thread(obddev, mds->mds_service, name);
1216                 if (rc) {
1217                         CERROR("cannot start MDS thread #%d: rc %d\n", i, rc);
1218                         GOTO(err_thread, rc);
1219                 }
1220         }
1221
1222         rc = mds_recover(obddev);
1223         if (rc)
1224                 GOTO(err_thread, rc);
1225
1226         ptlrpc_init_client(LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
1227                            "mds_ldlm_client", &obddev->obd_ldlm_client);
1228
1229         RETURN(0);
1230
1231 err_thread:
1232         ptlrpc_stop_all_threads(mds->mds_service);
1233 err_svc:
1234         ptlrpc_unregister_service(mds->mds_service);
1235 err_fs:
1236         mds_fs_cleanup(obddev);
1237 err_put:
1238         unlock_kernel();
1239         mntput(mds->mds_vfsmnt);
1240         mds->mds_sb = 0;
1241         lock_kernel();
1242 err_kfree:
1243         kfree(mds->mds_fstype);
1244 err_dec:
1245         MOD_DEC_USE_COUNT;
1246         RETURN(rc);
1247 }
1248
1249 static int mds_cleanup(struct obd_device *obddev)
1250 {
1251         struct super_block *sb;
1252         struct mds_obd *mds = &obddev->u.mds;
1253         struct obd_run_ctxt saved;
1254         ENTRY;
1255
1256         ptlrpc_stop_all_threads(mds->mds_service);
1257         ptlrpc_unregister_service(mds->mds_service);
1258
1259         sb = mds->mds_sb;
1260         if (!mds->mds_sb)
1261                 RETURN(0);
1262
1263         push_ctxt(&saved, &mds->mds_ctxt, NULL);
1264         mds_update_server_data(mds);
1265
1266         if (mds->mds_rcvd_filp) {
1267                 int rc = filp_close(mds->mds_rcvd_filp, 0);
1268                 mds->mds_rcvd_filp = NULL;
1269
1270                 if (rc)
1271                         CERROR("last_rcvd file won't close, rc=%d\n", rc);
1272         }
1273         pop_ctxt(&saved);
1274
1275         unlock_kernel();
1276         mntput(mds->mds_vfsmnt);
1277         mds->mds_sb = 0;
1278         kfree(mds->mds_fstype);
1279
1280         ldlm_namespace_free(obddev->obd_namespace);
1281
1282         lock_kernel();
1283 #ifdef CONFIG_DEV_RDONLY
1284         dev_clear_rdonly(2);
1285 #endif
1286         mds_fs_cleanup(obddev);
1287
1288         MOD_DEC_USE_COUNT;
1289         RETURN(0);
1290 }
1291
1292 static int ldlm_intent_policy(struct ldlm_lock *lock, void *req_cookie,
1293                               ldlm_mode_t mode, void *data)
1294 {
1295         struct ptlrpc_request *req = req_cookie;
1296         int rc = 0;
1297         ENTRY;
1298
1299         if (!req_cookie)
1300                 RETURN(0);
1301
1302         if (req->rq_reqmsg->bufcount > 1) {
1303                 /* an intent needs to be considered */
1304                 struct ldlm_intent *it = lustre_msg_buf(req->rq_reqmsg, 1);
1305                 struct mds_obd *mds= &req->rq_export->exp_obd->u.mds;
1306                 struct mds_body *mds_rep;
1307                 struct ldlm_reply *rep;
1308                 __u64 new_resid[3] = {0, 0, 0}, old_res;
1309                 int rc, size[3] = {sizeof(struct ldlm_reply),
1310                                                   sizeof(struct mds_body),
1311                                                   mds->mds_max_mdsize};
1312
1313                 it->opc = NTOH__u64(it->opc);
1314
1315                 LDLM_DEBUG(lock, "intent policy, opc: %s",
1316                            ldlm_it2str(it->opc));
1317
1318                 rc = lustre_pack_msg(3, size, NULL, &req->rq_replen,
1319                                      &req->rq_repmsg);
1320                 if (rc) {
1321                         rc = req->rq_status = -ENOMEM;
1322                         RETURN(rc);
1323                 }
1324
1325                 rep = lustre_msg_buf(req->rq_repmsg, 0);
1326                 rep->lock_policy_res1 = 1;
1327
1328                 /* execute policy */
1329                 switch ((long)it->opc) {
1330                 case IT_CREAT|IT_OPEN:
1331                         rc = mds_reint(2, req);
1332                         if (rc || (req->rq_status != 0 &&
1333                                    req->rq_status != -EEXIST)) {
1334                                 rep->lock_policy_res2 = req->rq_status;
1335                                 RETURN(ELDLM_LOCK_ABORTED);
1336                         }
1337                         break;
1338                 case IT_CREAT:
1339                 case IT_MKDIR:
1340                 case IT_MKNOD:
1341                 case IT_RENAME2:
1342                 case IT_LINK2:
1343                 case IT_RMDIR:
1344                 case IT_SYMLINK:
1345                 case IT_UNLINK:
1346                         rc = mds_reint(2, req);
1347                         if (rc || (req->rq_status != 0 &&
1348                                    req->rq_status != -EISDIR &&
1349                                    req->rq_status != -ENOTDIR)) {
1350                                 rep->lock_policy_res2 = req->rq_status;
1351                                 RETURN(ELDLM_LOCK_ABORTED);
1352                         }
1353                         break;
1354                 case IT_GETATTR:
1355                 case IT_LOOKUP:
1356                 case IT_OPEN:
1357                 case IT_READDIR:
1358                 case IT_READLINK:
1359                 case IT_RENAME:
1360                 case IT_LINK:
1361                 case IT_SETATTR:
1362                         rc = mds_getattr_name(2, req);
1363                         /* FIXME: we need to sit down and decide on who should
1364                          * set req->rq_status, who should return negative and
1365                          * positive return values, and what they all mean. */
1366                         if (rc || req->rq_status != 0) {
1367                                 rep->lock_policy_res2 = req->rq_status;
1368                                 RETURN(ELDLM_LOCK_ABORTED);
1369                         }
1370                         break;
1371                 case IT_READDIR|IT_OPEN:
1372                         LBUG();
1373                         break;
1374                 default:
1375                         CERROR("Unhandled intent\n");
1376                         LBUG();
1377                 }
1378
1379                 /* We don't bother returning a lock to the client for a file
1380                  * or directory we are removing.
1381                  *
1382                  * As for link and rename, there is no reason for the client
1383                  * to get a lock on the target at this point.  If they are
1384                  * going to modify the file/directory later they will get a
1385                  * lock at that time.
1386                  */
1387                 if (it->opc & (IT_UNLINK | IT_RMDIR | IT_LINK | IT_LINK2 |
1388                                IT_RENAME | IT_RENAME2))
1389                         RETURN(ELDLM_LOCK_ABORTED);
1390
1391                 rep->lock_policy_res2 = req->rq_status;
1392                 mds_rep = lustre_msg_buf(req->rq_repmsg, 1);
1393
1394                 /* If the client is about to open a file that doesn't have an MD
1395                  * stripe record, it's going to need a write lock. */
1396                 if (it->opc & IT_OPEN) {
1397                         struct lov_mds_md *lmm =
1398                                 lustre_msg_buf(req->rq_repmsg, 2);
1399                         if (lmm->lmm_easize == 0) {
1400                                 LDLM_DEBUG(lock, "open with no EA; returning PW"
1401                                            " lock");
1402                                 lock->l_req_mode = LCK_PW;
1403                         }
1404                 }
1405
1406                 /* Give the client a lock on the child object, instead of the
1407                  * parent that it requested. */
1408                 new_resid[0] = NTOH__u32(mds_rep->ino);
1409                 if (new_resid[0] == 0)
1410                         LBUG();
1411                 old_res = lock->l_resource->lr_name[0];
1412
1413                 ldlm_lock_change_resource(lock, new_resid);
1414                 if (lock->l_resource == NULL) {
1415                         LBUG();
1416                         RETURN(-ENOMEM);
1417                 }
1418                 LDLM_DEBUG(lock, "intent policy, old res %ld",
1419                            (long)old_res);
1420                 RETURN(ELDLM_LOCK_CHANGED);
1421         } else {
1422                 int size = sizeof(struct ldlm_reply);
1423                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
1424                                      &req->rq_repmsg);
1425                 if (rc) {
1426                         LBUG();
1427                         RETURN(-ENOMEM);
1428                 }
1429         }
1430         RETURN(rc);
1431 }
1432
1433
1434 extern int mds_iocontrol(long cmd, struct lustre_handle *conn,
1435                          int len, void *karg, void *uarg);
1436
1437 /* use obd ops to offer management infrastructure */
1438 static struct obd_ops mds_obd_ops = {
1439         o_connect:     mds_connect,
1440         o_disconnect:  mds_disconnect,
1441         o_setup:       mds_setup,
1442         o_cleanup:     mds_cleanup,
1443         o_iocontrol:   mds_iocontrol
1444 };
1445
1446 static int __init mds_init(void)
1447 {
1448         mds_file_cache = kmem_cache_create("ll_mds_file_data",
1449                                            sizeof(struct mds_file_data),
1450                                            0, 0, NULL, NULL);
1451         if (mds_file_cache == NULL)
1452                 return -ENOMEM;
1453
1454         class_register_type(&mds_obd_ops, LUSTRE_MDS_NAME);
1455         ldlm_register_intent(ldlm_intent_policy);
1456         return 0;
1457 }
1458
1459 static void __exit mds_exit(void)
1460 {
1461         ldlm_unregister_intent();
1462         class_unregister_type(LUSTRE_MDS_NAME);
1463         if (kmem_cache_destroy(mds_file_cache))
1464                 CERROR("couldn't free MDS file cache\n");
1465 }
1466
1467 MODULE_AUTHOR("Cluster File Systems <info@clusterfs.com>");
1468 MODULE_DESCRIPTION("Lustre Metadata Server (MDS) v0.01");
1469 MODULE_LICENSE("GPL");
1470
1471 module_init(mds_init);
1472 module_exit(mds_exit);