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) 2001-2003 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  *   Author: Mike Shaver <shaver@clusterfs.com>
  12  *
  13  *   This file is part of Lustre, http://www.lustre.org.
  14  *
  15  *   Lustre is free software; you can redistribute it and/or
  16  *   modify it under the terms of version 2 of the GNU General Public
  17  *   License as published by the Free Software Foundation.
  18  *
  19  *   Lustre is distributed in the hope that it will be useful,
  20  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *   GNU General Public License for more details.
  23  *
  24  *   You should have received a copy of the GNU General Public License
  25  *   along with Lustre; if not, write to the Free Software
  26  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 #ifndef EXPORT_SYMTAB
  30 # define EXPORT_SYMTAB
  31 #endif
  32 #define DEBUG_SUBSYSTEM S_MDS
  33
  34 #include <linux/module.h>
  35 #include <linux/lustre_mds.h>
  36 #include <linux/lustre_dlm.h>
  37 #include <linux/init.h>
  38 #include <linux/obd_class.h>
  39 #include <linux/random.h>
  40 #include <linux/fs.h>
  41 #include <linux/jbd.h>
  42 #include <linux/ext3_fs.h>
  43 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
  44 # include <linux/smp_lock.h>
  45 # include <linux/buffer_head.h>
  46 # include <linux/workqueue.h>
  47 # include <linux/mount.h>
  48 #else
  49 # include <linux/locks.h>
  50 #endif
  51 #include <linux/obd_lov.h>
  52 #include <linux/lustre_mds.h>
  53 #include <linux/lustre_fsfilt.h>
  54 #include <linux/lprocfs_status.h>
  55 #include <linux/lustre_commit_confd.h>
  56
  57 #include "mds_internal.h"
  58
  59 static int mds_cleanup(struct obd_device *obd, int flags);
  60
  61 static int mds_bulk_timeout(void *data)
  62 {
  63         struct ptlrpc_bulk_desc *desc = data;
  64         struct obd_export *exp = desc->bd_export;
  65
  66         DEBUG_REQ(D_ERROR, desc->bd_req,"bulk send timed out: evicting %s@%s\n",
  67                   exp->exp_client_uuid.uuid,
  68                   exp->exp_connection->c_remote_uuid.uuid);
  69         ptlrpc_fail_export(exp);
  70         ptlrpc_abort_bulk (desc);
  71         RETURN(1);
  72 }
  73
  74 /* Assumes caller has already pushed into the kernel filesystem context */
  75 static int mds_sendpage(struct ptlrpc_request *req, struct file *file,
  76                         loff_t offset, int count)
  77 {
  78         struct ptlrpc_bulk_desc *desc;
  79         struct l_wait_info lwi;
  80         struct page **pages;
  81         int rc = 0, npages, i, tmpcount, tmpsize = 0;
  82         ENTRY;
  83
  84         LASSERT((offset & (PAGE_SIZE - 1)) == 0); /* I'm dubious about this */
  85
  86         npages = (count + PAGE_SIZE - 1) >> PAGE_SHIFT;
  87         OBD_ALLOC(pages, sizeof(*pages) * npages);
  88         if (!pages)
  89                 GOTO(out, rc = -ENOMEM);
  90
  91         desc = ptlrpc_prep_bulk_exp (req, BULK_PUT_SOURCE, MDS_BULK_PORTAL);
  92         if (desc == NULL)
  93                 GOTO(out_free, rc = -ENOMEM);
  94
  95         for (i = 0, tmpcount = count; i < npages; i++, tmpcount -= tmpsize) {
  96                 tmpsize = tmpcount > PAGE_SIZE ? PAGE_SIZE : tmpcount;
  97
  98                 pages[i] = alloc_pages(GFP_KERNEL, 0);
  99                 if (pages[i] == NULL)
 100                         GOTO(cleanup_buf, rc = -ENOMEM);
 101
 102                 rc = ptlrpc_prep_bulk_page(desc, pages[i], 0, tmpsize);
 103                 if (rc != 0)
 104                         GOTO(cleanup_buf, rc);
 105         }
 106
 107         for (i = 0, tmpcount = count; i < npages; i++, tmpcount -= tmpsize) {
 108                 tmpsize = tmpcount > PAGE_SIZE ? PAGE_SIZE : tmpcount;
 109                 CDEBUG(D_EXT2, "reading %u@%llu from dir %lu (size %llu)\n",
 110                        tmpsize, offset, file->f_dentry->d_inode->i_ino,
 111                        file->f_dentry->d_inode->i_size);
 112
 113                 rc = fsfilt_readpage(req->rq_export->exp_obd, file,
 114                                      page_address(pages[i]), tmpsize, &offset);
 115
 116                 if (rc != tmpsize)
 117                         GOTO(cleanup_buf, rc = -EIO);
 118         }
 119
 120         rc = ptlrpc_bulk_put(desc);
 121         if (rc)
 122                 GOTO(cleanup_buf, rc);
 123
 124         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
 125                 CERROR("obd_fail_loc=%x, fail operation rc=%d\n",
 126                        OBD_FAIL_MDS_SENDPAGE, rc);
 127                 ptlrpc_abort_bulk(desc);
 128                 GOTO(cleanup_buf, rc);
 129         }
 130
 131         lwi = LWI_TIMEOUT(obd_timeout * HZ / 4, mds_bulk_timeout, desc);
 132         rc = l_wait_event(desc->bd_waitq, ptlrpc_bulk_complete (desc), &lwi);
 133         if (rc) {
 134                 LASSERT (rc == -ETIMEDOUT);
 135                 GOTO(cleanup_buf, rc);
 136         }
 137
 138         EXIT;
 139  cleanup_buf:
 140         for (i = 0; i < npages; i++)
 141                 if (pages[i])
 142                         __free_pages(pages[i], 0);
 143
 144         ptlrpc_free_bulk(desc);
 145  out_free:
 146         OBD_FREE(pages, sizeof(*pages) * npages);
 147  out:
 148         return rc;
 149 }
 150
 151 /* only valid locked dentries or errors should be returned */
 152 struct dentry *mds_fid2locked_dentry(struct obd_device *obd, struct ll_fid *fid,
 153                                      struct vfsmount **mnt, int lock_mode,
 154                                      struct lustre_handle *lockh,
 155                                      char *name, int namelen)
 156 {
 157         struct mds_obd *mds = &obd->u.mds;
 158         struct dentry *de = mds_fid2dentry(mds, fid, mnt), *retval = de;
 159         struct ldlm_res_id res_id = { .name = {0} };
 160         int flags = 0, rc;
 161         ENTRY;
 162
 163         if (IS_ERR(de))
 164                 RETURN(de);
 165
 166         res_id.name[0] = de->d_inode->i_ino;
 167         res_id.name[1] = de->d_inode->i_generation;
 168         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, NULL,
 169                               res_id, LDLM_PLAIN, NULL, 0, lock_mode,
 170                               &flags, ldlm_completion_ast,
 171                               mds_blocking_ast, NULL, lockh);
 172         if (rc != ELDLM_OK) {
 173                 l_dput(de);
 174                 retval = ERR_PTR(-EIO); /* XXX translate ldlm code */
 175         }
 176
 177         RETURN(retval);
 178 }
 179
 180 #ifndef DCACHE_DISCONNECTED
 181 #define DCACHE_DISCONNECTED DCACHE_NFSD_DISCONNECTED
 182 #endif
 183
 184
 185 /* Look up an entry by inode number. */
 186 /* this function ONLY returns valid dget'd dentries with an initialized inode
 187    or errors */
 188 struct dentry *mds_fid2dentry(struct mds_obd *mds, struct ll_fid *fid,
 189                               struct vfsmount **mnt)
 190 {
 191         char fid_name[32];
 192         unsigned long ino = fid->id;
 193         __u32 generation = fid->generation;
 194         struct inode *inode;
 195         struct dentry *result;
 196
 197         if (ino == 0)
 198                 RETURN(ERR_PTR(-ESTALE));
 199
 200         snprintf(fid_name, sizeof(fid_name), "0x%lx", ino);
 201
 202         CDEBUG(D_DENTRY, "--> mds_fid2dentry: ino/gen %lu/%u, sb %p\n",
 203                ino, generation, mds->mds_sb);
 204
 205         /* under ext3 this is neither supposed to return bad inodes
 206            nor NULL inodes. */
 207         result = ll_lookup_one_len(fid_name, mds->mds_fid_de, strlen(fid_name));
 208         if (IS_ERR(result))
 209                 RETURN(result);
 210
 211         inode = result->d_inode;
 212         if (!inode)
 213                 RETURN(ERR_PTR(-ENOENT));
 214
 215         if (generation && inode->i_generation != generation) {
 216                 /* we didn't find the right inode.. */
 217                 CERROR("bad inode %lu, link: %lu ct: %d or generation %u/%u\n",
 218                        inode->i_ino, (unsigned long)inode->i_nlink,
 219                        atomic_read(&inode->i_count), inode->i_generation,
 220                        generation);
 221                 dput(result);
 222                 RETURN(ERR_PTR(-ENOENT));
 223         }
 224
 225         if (mnt) {
 226                 *mnt = mds->mds_vfsmnt;
 227                 mntget(*mnt);
 228         }
 229
 230         RETURN(result);
 231 }
 232
 233
 234 /* Establish a connection to the MDS.
 235  *
 236  * This will set up an export structure for the client to hold state data
 237  * about that client, like open files, the last operation number it did
 238  * on the server, etc.
 239  */
 240 static int mds_connect(struct lustre_handle *conn, struct obd_device *obd,
 241                        struct obd_uuid *cluuid)
 242 {
 243         struct obd_export *exp;
 244         struct mds_export_data *med; /*  */
 245         struct mds_client_data *mcd;
 246         int rc, abort_recovery;
 247         ENTRY;
 248
 249         if (!conn || !obd || !cluuid)
 250                 RETURN(-EINVAL);
 251
 252         /* Check for aborted recovery. */
 253         spin_lock_bh(&obd->obd_processing_task_lock);
 254         abort_recovery = obd->obd_abort_recovery;
 255         spin_unlock_bh(&obd->obd_processing_task_lock);
 256         if (abort_recovery)
 257                 target_abort_recovery(obd);
 258
 259         /* XXX There is a small race between checking the list and adding a
 260          * new connection for the same UUID, but the real threat (list
 261          * corruption when multiple different clients connect) is solved.
 262          *
 263          * There is a second race between adding the export to the list,
 264          * and filling in the client data below.  Hence skipping the case
 265          * of NULL mcd above.  We should already be controlling multiple
 266          * connects at the client, and we can't hold the spinlock over
 267          * memory allocations without risk of deadlocking.
 268          */
 269         rc = class_connect(conn, obd, cluuid);
 270         if (rc)
 271                 RETURN(rc);
 272         exp = class_conn2export(conn);
 273         LASSERT(exp);
 274         med = &exp->exp_mds_data;
 275
 276         OBD_ALLOC(mcd, sizeof(*mcd));
 277         if (!mcd) {
 278                 CERROR("mds: out of memory for client data\n");
 279                 GOTO(out, rc = -ENOMEM);
 280         }
 281
 282         memcpy(mcd->mcd_uuid, cluuid, sizeof(mcd->mcd_uuid));
 283         med->med_mcd = mcd;
 284
 285         rc = mds_client_add(obd, &obd->u.mds, med, -1);
 286         if (rc == 0)
 287                 EXIT;
 288 out:
 289         if (rc) {
 290                 OBD_FREE(mcd, sizeof(*mcd));
 291                 class_disconnect(exp, 0);
 292         }
 293         class_export_put(exp);
 294
 295         return rc;
 296 }
 297
 298 static int mds_init_export(struct obd_export *exp)
 299 {
 300         struct mds_export_data *med = &exp->exp_mds_data;
 301
 302         INIT_LIST_HEAD(&med->med_open_head);
 303         spin_lock_init(&med->med_open_lock);
 304         RETURN(0);
 305 }
 306
 307 static int mds_destroy_export(struct obd_export *export)
 308 {
 309         struct mds_export_data *med;
 310         struct obd_device *obd = export->exp_obd;
 311         struct obd_run_ctxt saved;
 312         int rc = 0;
 313         ENTRY;
 314
 315         med = &export->exp_mds_data;
 316         target_destroy_export(export);
 317
 318         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 319         /* Close any open files (which may also cause orphan unlinking). */
 320         spin_lock(&med->med_open_lock);
 321         while (!list_empty(&med->med_open_head)) {
 322                 struct list_head *tmp = med->med_open_head.next;
 323                 struct mds_file_data *mfd =
 324                         list_entry(tmp, struct mds_file_data, mfd_list);
 325                 BDEVNAME_DECLARE_STORAGE(btmp);
 326
 327                 /* bug 1579: fix force-closing for 2.5 */
 328                 struct dentry *dentry = mfd->mfd_dentry;
 329
 330                 list_del(&mfd->mfd_list);
 331                 spin_unlock(&med->med_open_lock);
 332
 333                 CERROR("force closing client file handle for %*s (%s:%lu)\n",
 334                        dentry->d_name.len, dentry->d_name.name,
 335                        ll_bdevname(dentry->d_inode->i_sb, btmp),
 336                        dentry->d_inode->i_ino);
 337                 rc = mds_mfd_close(NULL, obd, mfd,
 338                                    !(export->exp_flags & OBD_OPT_FAILOVER));
 339
 340                 if (rc)
 341                         CDEBUG(D_INODE, "Error closing file: %d\n", rc);
 342                 spin_lock(&med->med_open_lock);
 343         }
 344         spin_unlock(&med->med_open_lock);
 345         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 346
 347         mds_client_free(export, !(export->exp_flags & OBD_OPT_FAILOVER));
 348
 349         RETURN(rc);
 350 }
 351
 352 static int mds_disconnect(struct obd_export *export, int flags)
 353 {
 354         unsigned long irqflags;
 355         int rc;
 356         ENTRY;
 357
 358         ldlm_cancel_locks_for_export(export);
 359
 360         spin_lock_irqsave(&export->exp_lock, irqflags);
 361         export->exp_flags = flags;
 362         spin_unlock_irqrestore(&export->exp_lock, irqflags);
 363
 364         rc = class_disconnect(export, flags);
 365         RETURN(rc);
 366 }
 367
 368 static int mds_getstatus(struct ptlrpc_request *req)
 369 {
 370         struct mds_obd *mds = mds_req2mds(req);
 371         struct mds_body *body;
 372         int rc, size = sizeof(*body);
 373         ENTRY;
 374
 375         rc = lustre_pack_reply(req, 1, &size, NULL);
 376         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK)) {
 377                 CERROR("mds: out of memory for message: size=%d\n", size);
 378                 req->rq_status = -ENOMEM;       /* superfluous? */
 379                 RETURN(-ENOMEM);
 380         }
 381
 382         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 383         memcpy(&body->fid1, &mds->mds_rootfid, sizeof(body->fid1));
 384
 385         /* the last_committed and last_xid fields are filled in for all
 386          * replies already - no need to do so here also.
 387          */
 388         RETURN(0);
 389 }
 390
 391 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 392                      void *data, int flag)
 393 {
 394         int do_ast;
 395         ENTRY;
 396
 397         if (flag == LDLM_CB_CANCELING) {
 398                 /* Don't need to do anything here. */
 399                 RETURN(0);
 400         }
 401
 402         /* XXX layering violation!  -phil */
 403         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 404         /* Get this: if mds_blocking_ast is racing with ldlm_intent_policy,
 405          * such that mds_blocking_ast is called just before l_i_p takes the
 406          * ns_lock, then by the time we get the lock, we might not be the
 407          * correct blocking function anymore.  So check, and return early, if
 408          * so. */
 409         if (lock->l_blocking_ast != mds_blocking_ast) {
 410                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 411                 RETURN(0);
 412         }
 413
 414         lock->l_flags |= LDLM_FL_CBPENDING;
 415         do_ast = (!lock->l_readers && !lock->l_writers);
 416         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 417
 418         if (do_ast) {
 419                 struct lustre_handle lockh;
 420                 int rc;
 421
 422                 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
 423                 ldlm_lock2handle(lock, &lockh);
 424                 rc = ldlm_cli_cancel(&lockh);
 425                 if (rc < 0)
 426                         CERROR("ldlm_cli_cancel: %d\n", rc);
 427         } else {
 428                 LDLM_DEBUG(lock, "Lock still has references, will be "
 429                            "cancelled later");
 430         }
 431         RETURN(0);
 432 }
 433
 434 /* Call with lock=1 if you want mds_pack_md to take the i_sem.
 435  * Call with lock=0 if the caller has already taken the i_sem. */
 436 int mds_pack_md(struct obd_device *obd, struct lustre_msg *msg, int offset,
 437                 struct mds_body *body, struct inode *inode, int lock)
 438 {
 439         struct mds_obd *mds = &obd->u.mds;
 440         void *lmm;
 441         int lmm_size;
 442         int rc;
 443         ENTRY;
 444
 445         lmm = lustre_msg_buf(msg, offset, 0);
 446         if (lmm == NULL) {
 447                 /* Some problem with getting eadata when I sized the reply
 448                  * buffer... */
 449                 CDEBUG(D_INFO, "no space reserved for inode %lu MD\n",
 450                        inode->i_ino);
 451                 RETURN(0);
 452         }
 453         lmm_size = msg->buflens[offset];
 454
 455         /* I don't really like this, but it is a sanity check on the client
 456          * MD request.  However, if the client doesn't know how much space
 457          * to reserve for the MD, it shouldn't be bad to have too much space.
 458          */
 459         if (lmm_size > mds->mds_max_mdsize) {
 460                 CWARN("Reading MD for inode %lu of %d bytes > max %d\n",
 461                        inode->i_ino, lmm_size, mds->mds_max_mdsize);
 462                 // RETURN(-EINVAL);
 463         }
 464
 465         if (lock)
 466                 down(&inode->i_sem);
 467         rc = fsfilt_get_md(obd, inode, lmm, lmm_size);
 468         if (lock)
 469                 up(&inode->i_sem);
 470         if (rc < 0) {
 471                 CERROR("Error %d reading eadata for ino %lu\n",
 472                        rc, inode->i_ino);
 473         } else if (rc > 0) {
 474                 lmm_size = rc;
 475                 rc = mds_convert_lov_ea(obd, inode, lmm, lmm_size);
 476
 477                 if (rc > 0)
 478                         lmm_size = rc;
 479                 body->valid |= OBD_MD_FLEASIZE;
 480                 body->eadatasize = lmm_size;
 481                 rc = 0;
 482         }
 483
 484         RETURN(rc);
 485 }
 486
 487 static int mds_getattr_internal(struct obd_device *obd, struct dentry *dentry,
 488                                 struct ptlrpc_request *req,
 489                                 struct mds_body *reqbody, int reply_off)
 490 {
 491         struct mds_body *body;
 492         struct inode *inode = dentry->d_inode;
 493         int rc = 0;
 494         ENTRY;
 495
 496         if (inode == NULL)
 497                 RETURN(-ENOENT);
 498
 499         body = lustre_msg_buf(req->rq_repmsg, reply_off, sizeof(*body));
 500         LASSERT(body != NULL);                 /* caller prepped reply */
 501
 502         mds_pack_inode2fid(&body->fid1, inode);
 503         mds_pack_inode2body(body, inode);
 504
 505         if (S_ISREG(inode->i_mode) && (reqbody->valid & OBD_MD_FLEASIZE) != 0) {
 506                 rc = mds_pack_md(obd, req->rq_repmsg, reply_off + 1, body,
 507                                  inode, 1);
 508
 509                 /* If we have LOV EA data, the OST holds size, atime, mtime */
 510                 if (!(body->valid & OBD_MD_FLEASIZE))
 511                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
 512                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
 513         } else if (S_ISLNK(inode->i_mode) &&
 514                    (reqbody->valid & OBD_MD_LINKNAME) != 0) {
 515                 char *symname = lustre_msg_buf(req->rq_repmsg, reply_off + 1,0);
 516                 int len;
 517
 518                 LASSERT (symname != NULL);       /* caller prepped reply */
 519                 len = req->rq_repmsg->buflens[reply_off + 1];
 520
 521                 rc = inode->i_op->readlink(dentry, symname, len);
 522                 if (rc < 0) {
 523                         CERROR("readlink failed: %d\n", rc);
 524                 } else if (rc != len - 1) {
 525                         CERROR ("Unexpected readlink rc %d: expecting %d\n",
 526                                 rc, len - 1);
 527                         rc = -EINVAL;
 528                 } else {
 529                         CDEBUG(D_INODE, "read symlink dest %s\n", symname);
 530                         body->valid |= OBD_MD_LINKNAME;
 531                         body->eadatasize = rc + 1;
 532                         symname[rc] = 0;        /* NULL terminate */
 533                         rc = 0;
 534                 }
 535         }
 536
 537         RETURN(rc);
 538 }
 539
 540 static int mds_getattr_pack_msg(struct ptlrpc_request *req, struct inode *inode,
 541                                 int offset)
 542 {
 543         struct mds_obd *mds = mds_req2mds(req);
 544         struct mds_body *body;
 545         int rc = 0, size[2] = {sizeof(*body)}, bufcount = 1;
 546         ENTRY;
 547
 548         body = lustre_msg_buf(req->rq_reqmsg, offset, sizeof (*body));
 549         LASSERT(body != NULL);                 /* checked by caller */
 550         LASSERT_REQSWABBED(req, offset);       /* swabbed by caller */
 551
 552         if (S_ISREG(inode->i_mode) && (body->valid & OBD_MD_FLEASIZE)) {
 553                 int rc;
 554                 down(&inode->i_sem);
 555                 rc = fsfilt_get_md(req->rq_export->exp_obd, inode, NULL, 0);
 556                 up(&inode->i_sem);
 557                 CDEBUG(D_INODE, "got %d bytes MD data for inode %lu\n",
 558                        rc, inode->i_ino);
 559                 if (rc < 0) {
 560                         if (rc != -ENODATA)
 561                                 CERROR("error getting inode %lu MD: rc = %d\n",
 562                                        inode->i_ino, rc);
 563                         size[bufcount] = 0;
 564                 } else if (rc > mds->mds_max_mdsize) {
 565                         size[bufcount] = 0;
 566                         CERROR("MD size %d larger than maximum possible %u\n",
 567                                rc, mds->mds_max_mdsize);
 568                 } else {
 569                         size[bufcount] = rc;
 570                 }
 571                 bufcount++;
 572         } else if (S_ISLNK(inode->i_mode) && (body->valid & OBD_MD_LINKNAME)) {
 573                 if (inode->i_size + 1 != body->eadatasize)
 574                         CERROR("symlink size: %Lu, reply space: %d\n",
 575                                inode->i_size + 1, body->eadatasize);
 576                 size[bufcount] = MIN(inode->i_size + 1, body->eadatasize);
 577                 bufcount++;
 578                 CDEBUG(D_INODE, "symlink size: %Lu, reply space: %d\n",
 579                        inode->i_size + 1, body->eadatasize);
 580         }
 581
 582         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK)) {
 583                 CERROR("failed MDS_GETATTR_PACK test\n");
 584                 req->rq_status = -ENOMEM;
 585                 GOTO(out, rc = -ENOMEM);
 586         }
 587
 588         rc = lustre_pack_reply(req, bufcount, size, NULL);
 589         if (rc) {
 590                 CERROR("out of memory\n");
 591                 GOTO(out, req->rq_status = rc);
 592         }
 593
 594         EXIT;
 595  out:
 596         return(rc);
 597 }
 598
 599 static int mds_getattr_name(int offset, struct ptlrpc_request *req,
 600                             struct lustre_handle *child_lockh)
 601 {
 602         struct obd_device *obd = req->rq_export->exp_obd;
 603         struct ldlm_reply *rep = NULL;
 604         struct obd_run_ctxt saved;
 605         struct mds_body *body;
 606         struct dentry *dparent = NULL, *dchild = NULL;
 607         struct obd_ucred uc;
 608         struct lustre_handle parent_lockh;
 609         int namesize;
 610         int rc = 0, cleanup_phase = 0, resent_req = 0;
 611         char *name;
 612         ENTRY;
 613
 614         LASSERT(!strcmp(obd->obd_type->typ_name, "mds"));
 615
 616         /* Swab now, before anyone looks inside the request */
 617
 618         body = lustre_swab_reqbuf(req, offset, sizeof(*body),
 619                                   lustre_swab_mds_body);
 620         if (body == NULL) {
 621                 CERROR("Can't swab mds_body\n");
 622                 GOTO(cleanup, rc = -EFAULT);
 623         }
 624
 625         LASSERT_REQSWAB(req, offset + 1);
 626         name = lustre_msg_string(req->rq_reqmsg, offset + 1, 0);
 627         if (name == NULL) {
 628                 CERROR("Can't unpack name\n");
 629                 GOTO(cleanup, rc = -EFAULT);
 630         }
 631         namesize = req->rq_reqmsg->buflens[offset + 1];
 632
 633         LASSERT (offset == 0 || offset == 2);
 634         /* if requests were at offset 2, the getattr reply goes back at 1 */
 635         if (offset) {
 636                 rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*rep));
 637                 offset = 1;
 638         }
 639
 640         uc.ouc_fsuid = body->fsuid;
 641         uc.ouc_fsgid = body->fsgid;
 642         uc.ouc_cap = body->capability;
 643         uc.ouc_suppgid1 = body->suppgid;
 644         uc.ouc_suppgid2 = -1;
 645         push_ctxt(&saved, &obd->obd_ctxt, &uc);
 646         cleanup_phase = 1; /* kernel context */
 647         intent_set_disposition(rep, DISP_LOOKUP_EXECD);
 648
 649         /* FIXME: handle raw lookup */
 650 #if 0
 651         if (body->valid == OBD_MD_FLID) {
 652                 struct mds_body *mds_reply;
 653                 int size = sizeof(*mds_reply);
 654                 ino_t inum;
 655                 // The user requested ONLY the inode number, so do a raw lookup
 656                 rc = lustre_pack_reply(req, 1, &size, NULL);
 657                 if (rc) {
 658                         CERROR("out of memory\n");
 659                         GOTO(cleanup, rc);
 660                 }
 661
 662                 rc = dir->i_op->lookup_raw(dir, name, namesize - 1, &inum);
 663
 664                 mds_reply = lustre_msg_buf(req->rq_repmsg, offset,
 665                                            sizeof(*mds_reply));
 666                 mds_reply->fid1.id = inum;
 667                 mds_reply->valid = OBD_MD_FLID;
 668                 GOTO(cleanup, rc);
 669         }
 670 #endif
 671
 672         if (child_lockh->cookie != 0) {
 673                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
 674                 resent_req = 1;
 675         }
 676
 677         if (resent_req == 0) {
 678                 rc = mds_get_parent_child_locked(obd, &obd->u.mds, &body->fid1,
 679                                                  &parent_lockh, &dparent,
 680                                                  LCK_PR, name, namesize,
 681                                                  child_lockh, &dchild, LCK_PR);
 682                 if (rc)
 683                         GOTO(cleanup, rc);
 684         } else {
 685                 struct ldlm_lock *granted_lock;
 686                 struct ll_fid child_fid;
 687                 struct ldlm_resource *res;
 688                 DEBUG_REQ(D_DLMTRACE, req, "resent, not enqueuing new locks");
 689                 granted_lock = ldlm_handle2lock(child_lockh);
 690                 LASSERT(granted_lock);
 691
 692                 res = granted_lock->l_resource;
 693                 child_fid.id = res->lr_name.name[0];
 694                 child_fid.generation = res->lr_name.name[1];
 695                 dchild = mds_fid2dentry(&obd->u.mds, &child_fid, NULL);
 696                 LASSERT(dchild);
 697                 LDLM_LOCK_PUT(granted_lock);
 698         }
 699
 700         cleanup_phase = 2; /* dchild, dparent, locks */
 701
 702         if (dchild->d_inode == NULL) {
 703                 intent_set_disposition(rep, DISP_LOOKUP_NEG);
 704                 /* in the intent case, the policy clears this error:
 705                    the disposition is enough */
 706                 GOTO(cleanup, rc = -ENOENT);
 707         } else {
 708                 intent_set_disposition(rep, DISP_LOOKUP_POS);
 709         }
 710
 711         if (req->rq_repmsg == NULL) {
 712                 rc = mds_getattr_pack_msg(req, dchild->d_inode, offset);
 713                 if (rc != 0) {
 714                         CERROR ("mds_getattr_pack_msg: %d\n", rc);
 715                         GOTO (cleanup, rc);
 716                 }
 717         }
 718
 719         rc = mds_getattr_internal(obd, dchild, req, body, offset);
 720         GOTO(cleanup, rc); /* returns the lock to the client */
 721
 722  cleanup:
 723         switch (cleanup_phase) {
 724         case 2:
 725                 if (resent_req == 0) {
 726                         if (rc && dchild->d_inode)
 727                                 ldlm_lock_decref(child_lockh, LCK_PR);
 728                         ldlm_lock_decref(&parent_lockh, LCK_PR);
 729                         l_dput(dparent);
 730                 }
 731                 l_dput(dchild);
 732         case 1:
 733                 pop_ctxt(&saved, &obd->obd_ctxt, &uc);
 734         default: ;
 735         }
 736         return rc;
 737 }
 738
 739 static int mds_getattr(int offset, struct ptlrpc_request *req)
 740 {
 741         struct mds_obd *mds = mds_req2mds(req);
 742         struct obd_device *obd = req->rq_export->exp_obd;
 743         struct obd_run_ctxt saved;
 744         struct dentry *de;
 745         struct mds_body *body;
 746         struct obd_ucred uc;
 747         int rc = 0;
 748         ENTRY;
 749
 750         body = lustre_swab_reqbuf (req, offset, sizeof (*body),
 751                                    lustre_swab_mds_body);
 752         if (body == NULL) {
 753                 CERROR ("Can't unpack body\n");
 754                 RETURN (-EFAULT);
 755         }
 756
 757         uc.ouc_fsuid = body->fsuid;
 758         uc.ouc_fsgid = body->fsgid;
 759         uc.ouc_cap = body->capability;
 760         push_ctxt(&saved, &obd->obd_ctxt, &uc);
 761         de = mds_fid2dentry(mds, &body->fid1, NULL);
 762         if (IS_ERR(de)) {
 763                 rc = req->rq_status = -ENOENT;
 764                 GOTO(out_pop, PTR_ERR(de));
 765         }
 766
 767         rc = mds_getattr_pack_msg(req, de->d_inode, offset);
 768         if (rc != 0) {
 769                 CERROR ("mds_getattr_pack_msg: %d\n", rc);
 770                 GOTO (out_pop, rc);
 771         }
 772
 773         req->rq_status = mds_getattr_internal(obd, de, req, body, 0);
 774
 775         l_dput(de);
 776         GOTO(out_pop, rc);
 777 out_pop:
 778         pop_ctxt(&saved, &obd->obd_ctxt, &uc);
 779         return rc;
 780 }
 781
 782
 783 static int mds_obd_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 784                           unsigned long max_age)
 785 {
 786         return fsfilt_statfs(obd, obd->u.mds.mds_sb, osfs);
 787 }
 788
 789 static int mds_statfs(struct ptlrpc_request *req)
 790 {
 791         struct obd_device *obd = req->rq_export->exp_obd;
 792         int rc, size = sizeof(struct obd_statfs);
 793         ENTRY;
 794
 795         rc = lustre_pack_reply(req, 1, &size, NULL);
 796         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK)) {
 797                 CERROR("mds: statfs lustre_pack_reply failed: rc = %d\n", rc);
 798                 GOTO(out, rc);
 799         }
 800
 801         /* We call this so that we can cache a bit - 1 jiffie worth */
 802         rc = obd_statfs(obd, lustre_msg_buf(req->rq_repmsg,0,size),jiffies-HZ);
 803         if (rc) {
 804                 CERROR("mds_obd_statfs failed: rc %d\n", rc);
 805                 GOTO(out, rc);
 806         }
 807
 808         EXIT;
 809 out:
 810         req->rq_status = rc;
 811         return 0;
 812 }
 813
 814 static int mds_sync(struct ptlrpc_request *req)
 815 {
 816         struct obd_device *obd = req->rq_export->exp_obd;
 817         struct mds_obd *mds = &obd->u.mds;
 818         struct mds_body *body;
 819         int rc, size = sizeof(*body);
 820         ENTRY;
 821
 822         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 823         if (body == NULL)
 824                 GOTO(out, rc = -EPROTO);
 825
 826         rc = lustre_pack_reply(req, 1, &size, NULL);
 827         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK)) {
 828                 CERROR("fsync lustre_pack_reply failed: rc = %d\n", rc);
 829                 GOTO(out, rc);
 830         }
 831
 832         if (body->fid1.id == 0) {
 833                 /* a fid of zero is taken to mean "sync whole filesystem" */
 834                 rc = fsfilt_sync(obd, mds->mds_sb);
 835                 if (rc)
 836                         GOTO(out, rc);
 837         } else {
 838                 /* just any file to grab fsync method - "file" arg unused */
 839                 struct file *file = mds->mds_rcvd_filp;
 840                 struct dentry *de;
 841
 842                 de = mds_fid2dentry(mds, &body->fid1, NULL);
 843                 if (IS_ERR(de))
 844                         GOTO(out, rc = PTR_ERR(de));
 845
 846                 rc = file->f_op->fsync(NULL, de, 1);
 847                 l_dput(de);
 848                 if (rc)
 849                         GOTO(out, rc);
 850
 851                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
 852                 mds_pack_inode2fid(&body->fid1, de->d_inode);
 853                 mds_pack_inode2body(body, de->d_inode);
 854         }
 855 out:
 856         req->rq_status = rc;
 857         return 0;
 858 }
 859
 860 /* mds_readpage does not take a DLM lock on the inode, because the client must
 861  * already have a PR lock.
 862  *
 863  * If we were to take another one here, a deadlock will result, if another
 864  * thread is already waiting for a PW lock. */
 865 static int mds_readpage(struct ptlrpc_request *req)
 866 {
 867         struct obd_device *obd = req->rq_export->exp_obd;
 868         struct vfsmount *mnt;
 869         struct dentry *de;
 870         struct file *file;
 871         struct mds_body *body, *repbody;
 872         struct obd_run_ctxt saved;
 873         int rc, size = sizeof(*repbody);
 874         struct obd_ucred uc;
 875         ENTRY;
 876
 877         rc = lustre_pack_reply(req, 1, &size, NULL);
 878         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK)) {
 879                 CERROR("mds: out of memory\n");
 880                 GOTO(out, rc = -ENOMEM);
 881         }
 882
 883         body = lustre_swab_reqbuf(req, 0, sizeof(*body), lustre_swab_mds_body);
 884         if (body == NULL)
 885                 GOTO (out, rc = -EFAULT);
 886
 887         uc.ouc_fsuid = body->fsuid;
 888         uc.ouc_fsgid = body->fsgid;
 889         uc.ouc_cap = body->capability;
 890         push_ctxt(&saved, &obd->obd_ctxt, &uc);
 891         de = mds_fid2dentry(&obd->u.mds, &body->fid1, &mnt);
 892         if (IS_ERR(de))
 893                 GOTO(out_pop, rc = PTR_ERR(de));
 894
 895         CDEBUG(D_INODE, "ino %lu\n", de->d_inode->i_ino);
 896
 897         file = dentry_open(de, mnt, O_RDONLY | O_LARGEFILE);
 898         /* note: in case of an error, dentry_open puts dentry */
 899         if (IS_ERR(file))
 900                 GOTO(out_pop, rc = PTR_ERR(file));
 901
 902         /* body->size is actually the offset -eeb */
 903         if ((body->size & (de->d_inode->i_blksize - 1)) != 0) {
 904                 CERROR("offset "LPU64" not on a block boundary of %lu\n",
 905                        body->size, de->d_inode->i_blksize);
 906                 GOTO(out_file, rc = -EFAULT);
 907         }
 908
 909         /* body->nlink is actually the #bytes to read -eeb */
 910         if (body->nlink & (de->d_inode->i_blksize - 1)) {
 911                 CERROR("size %u is not multiple of blocksize %lu\n",
 912                        body->nlink, de->d_inode->i_blksize);
 913                 GOTO(out_file, rc = -EFAULT);
 914         }
 915
 916         repbody = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*repbody));
 917         repbody->size = file->f_dentry->d_inode->i_size;
 918         repbody->valid = OBD_MD_FLSIZE;
 919
 920         /* to make this asynchronous make sure that the handling function
 921            doesn't send a reply when this function completes. Instead a
 922            callback function would send the reply */
 923         /* body->size is actually the offset -eeb */
 924         rc = mds_sendpage(req, file, body->size, body->nlink);
 925
 926 out_file:
 927         filp_close(file, 0);
 928 out_pop:
 929         pop_ctxt(&saved, &obd->obd_ctxt, &uc);
 930 out:
 931         req->rq_status = rc;
 932         RETURN(0);
 933 }
 934
 935 int mds_reint(struct ptlrpc_request *req, int offset,
 936               struct lustre_handle *lockh)
 937 {
 938         struct mds_update_record *rec; /* 116 bytes on the stack?  no sir! */
 939         int rc;
 940
 941         OBD_ALLOC(rec, sizeof(*rec));
 942         if (rec == NULL)
 943                 RETURN(-ENOMEM);
 944
 945         rc = mds_update_unpack(req, offset, rec);
 946         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNPACK)) {
 947                 CERROR("invalid record\n");
 948                 GOTO(out, req->rq_status = -EINVAL);
 949         }
 950         /* rc will be used to interrupt a for loop over multiple records */
 951         rc = mds_reint_rec(rec, offset, req, lockh);
 952  out:
 953         OBD_FREE(rec, sizeof(*rec));
 954         return rc;
 955 }
 956
 957 static int mds_filter_recovery_request(struct ptlrpc_request *req,
 958                                        struct obd_device *obd, int *process)
 959 {
 960         switch (req->rq_reqmsg->opc) {
 961         case MDS_CONNECT: /* This will never get here, but for completeness. */
 962         case OST_CONNECT: /* This will never get here, but for completeness. */
 963         case MDS_DISCONNECT:
 964         case OST_DISCONNECT:
 965                *process = 1;
 966                RETURN(0);
 967
 968         case MDS_CLOSE:
 969         case MDS_SYNC: /* used in unmounting */
 970         case OBD_PING:
 971         case MDS_REINT:
 972         case LDLM_ENQUEUE:
 973                 *process = target_queue_recovery_request(req, obd);
 974                 RETURN(0);
 975
 976         default:
 977                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
 978                 *process = 0;
 979                 /* XXX what should we set rq_status to here? */
 980                 req->rq_status = -EAGAIN;
 981                 RETURN(ptlrpc_error(req));
 982         }
 983 }
 984
 985 static char *reint_names[] = {
 986         [REINT_SETATTR] "setattr",
 987         [REINT_CREATE]  "create",
 988         [REINT_LINK]    "link",
 989         [REINT_UNLINK]  "unlink",
 990         [REINT_RENAME]  "rename",
 991         [REINT_OPEN]    "open",
 992 };
 993
 994 int mds_handle(struct ptlrpc_request *req)
 995 {
 996         int should_process, fail = OBD_FAIL_MDS_ALL_REPLY_NET;
 997         int rc = 0;
 998         struct mds_obd *mds = NULL; /* quell gcc overwarning */
 999         struct obd_device *obd = NULL;
1000         ENTRY;
1001
1002         OBD_FAIL_RETURN(OBD_FAIL_MDS_ALL_REQUEST_NET | OBD_FAIL_ONCE, 0);
1003
1004         LASSERT(current->journal_info == NULL);
1005         /* XXX identical to OST */
1006         if (req->rq_reqmsg->opc != MDS_CONNECT) {
1007                 struct mds_export_data *med;
1008                 int recovering, abort_recovery;
1009
1010                 if (req->rq_export == NULL) {
1011                         CERROR("lustre_mds: operation %d on unconnected MDS\n",
1012                                req->rq_reqmsg->opc);
1013                         req->rq_status = -ENOTCONN;
1014                         GOTO(out, rc = -ENOTCONN);
1015                 }
1016
1017                 med = &req->rq_export->exp_mds_data;
1018                 obd = req->rq_export->exp_obd;
1019                 mds = &obd->u.mds;
1020
1021                 /* Check for aborted recovery. */
1022                 spin_lock_bh(&obd->obd_processing_task_lock);
1023                 abort_recovery = obd->obd_abort_recovery;
1024                 recovering = obd->obd_recovering;
1025                 spin_unlock_bh(&obd->obd_processing_task_lock);
1026                 if (abort_recovery) {
1027                         target_abort_recovery(obd);
1028                 } else if (recovering) {
1029                         rc = mds_filter_recovery_request(req, obd,
1030                                                          &should_process);
1031                         if (rc || !should_process)
1032                                 RETURN(rc);
1033                 }
1034         }
1035
1036         switch (req->rq_reqmsg->opc) {
1037         case MDS_CONNECT:
1038                 DEBUG_REQ(D_INODE, req, "connect");
1039                 OBD_FAIL_RETURN(OBD_FAIL_MDS_CONNECT_NET, 0);
1040                 rc = target_handle_connect(req, mds_handle);
1041                 if (!rc)
1042                         /* Now that we have an export, set mds. */
1043                         mds = mds_req2mds(req);
1044                 break;
1045
1046         case MDS_DISCONNECT:
1047                 DEBUG_REQ(D_INODE, req, "disconnect");
1048                 OBD_FAIL_RETURN(OBD_FAIL_MDS_DISCONNECT_NET, 0);
1049                 rc = target_handle_disconnect(req);
1050                 req->rq_status = rc;            /* superfluous? */
1051                 break;
1052
1053         case MDS_GETSTATUS:
1054                 DEBUG_REQ(D_INODE, req, "getstatus");
1055                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETSTATUS_NET, 0);
1056                 rc = mds_getstatus(req);
1057                 break;
1058
1059         case MDS_GETATTR:
1060                 DEBUG_REQ(D_INODE, req, "getattr");
1061                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETATTR_NET, 0);
1062                 rc = mds_getattr(0, req);
1063                 break;
1064
1065         case MDS_GETATTR_NAME: {
1066                 struct lustre_handle lockh;
1067                 DEBUG_REQ(D_INODE, req, "getattr_name");
1068                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETATTR_NAME_NET, 0);
1069
1070                 /* If this request gets a reconstructed reply, we won't be
1071                  * acquiring any new locks in mds_getattr_name, so we don't
1072                  * want to cancel.
1073                  */
1074                 lockh.cookie = 0;
1075                 rc = mds_getattr_name(0, req, &lockh);
1076                 /* this non-intent call (from an ioctl) is special */
1077                 req->rq_status = rc;
1078                 if (rc == 0 && lockh.cookie)
1079                         ldlm_lock_decref(&lockh, LCK_PR);
1080                 break;
1081         }
1082         case MDS_STATFS:
1083                 DEBUG_REQ(D_INODE, req, "statfs");
1084                 OBD_FAIL_RETURN(OBD_FAIL_MDS_STATFS_NET, 0);
1085                 rc = mds_statfs(req);
1086                 break;
1087
1088         case MDS_READPAGE:
1089                 DEBUG_REQ(D_INODE, req, "readpage");
1090                 OBD_FAIL_RETURN(OBD_FAIL_MDS_READPAGE_NET, 0);
1091                 rc = mds_readpage(req);
1092
1093                 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1094                         return 0;
1095                 break;
1096
1097         case MDS_REINT: {
1098                 __u32 *opcp = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*opcp));
1099                 __u32  opc;
1100                 int size[3] = {sizeof(struct mds_body), mds->mds_max_mdsize,
1101                                mds->mds_max_cookiesize};
1102                 int bufcount;
1103
1104                 /* NB only peek inside req now; mds_reint() will swab it */
1105                 if (opcp == NULL) {
1106                         CERROR ("Can't inspect opcode\n");
1107                         rc = -EINVAL;
1108                         break;
1109                 }
1110                 opc = *opcp;
1111                 if (lustre_msg_swabbed (req->rq_reqmsg))
1112                         __swab32s(&opc);
1113
1114                 DEBUG_REQ(D_INODE, req, "reint %d (%s)", opc,
1115                           (opc < sizeof(reint_names) / sizeof(reint_names[0]) ||
1116                            reint_names[opc] == NULL) ? reint_names[opc] :
1117                                                        "unknown opcode");
1118
1119                 OBD_FAIL_RETURN(OBD_FAIL_MDS_REINT_NET, 0);
1120
1121                 if (opc == REINT_UNLINK)
1122                         bufcount = 3;
1123                 else if (opc == REINT_OPEN || opc == REINT_RENAME)
1124                         bufcount = 2;
1125                 else
1126                         bufcount = 1;
1127
1128                 rc = lustre_pack_reply(req, bufcount, size, NULL);
1129                 if (rc)
1130                         break;
1131
1132                 rc = mds_reint(req, 0, NULL);
1133                 fail = OBD_FAIL_MDS_REINT_NET_REP;
1134                 break;
1135         }
1136
1137         case MDS_CLOSE:
1138                 DEBUG_REQ(D_INODE, req, "close");
1139                 OBD_FAIL_RETURN(OBD_FAIL_MDS_CLOSE_NET, 0);
1140                 rc = mds_close(req);
1141                 break;
1142
1143         case MDS_DONE_WRITING:
1144                 DEBUG_REQ(D_INODE, req, "done_writing");
1145                 OBD_FAIL_RETURN(OBD_FAIL_MDS_DONE_WRITING_NET, 0);
1146                 rc = mds_done_writing(req);
1147                 break;
1148
1149         case MDS_PIN:
1150                 DEBUG_REQ(D_INODE, req, "pin");
1151                 OBD_FAIL_RETURN(OBD_FAIL_MDS_PIN_NET, 0);
1152                 rc = mds_pin(req);
1153                 break;
1154
1155         case MDS_SYNC:
1156                 DEBUG_REQ(D_INODE, req, "sync");
1157                 OBD_FAIL_RETURN(OBD_FAIL_MDS_SYNC_NET, 0);
1158                 rc = mds_sync(req);
1159                 break;
1160
1161         case OBD_PING:
1162                 DEBUG_REQ(D_INODE, req, "ping");
1163                 rc = target_handle_ping(req);
1164                 break;
1165
1166         case OBD_LOG_CANCEL:
1167                 CDEBUG(D_INODE, "log cancel\n");
1168                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOG_CANCEL_NET, 0);
1169                 rc = -ENOTSUPP; /* la la la */
1170                 break;
1171
1172         case LDLM_ENQUEUE:
1173                 DEBUG_REQ(D_INODE, req, "enqueue");
1174                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
1175                 rc = ldlm_handle_enqueue(req, ldlm_server_completion_ast,
1176                                          ldlm_server_blocking_ast);
1177                 break;
1178         case LDLM_CONVERT:
1179                 DEBUG_REQ(D_INODE, req, "convert");
1180                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
1181                 rc = ldlm_handle_convert(req);
1182                 break;
1183         case LDLM_BL_CALLBACK:
1184         case LDLM_CP_CALLBACK:
1185                 DEBUG_REQ(D_INODE, req, "callback");
1186                 CERROR("callbacks should not happen on MDS\n");
1187                 LBUG();
1188                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
1189                 break;
1190         case LLOG_ORIGIN_HANDLE_CREATE:
1191                 DEBUG_REQ(D_INODE, req, "llog_init");
1192                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1193                 rc = llog_origin_handle_create(req);
1194                 break;
1195         case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1196                 DEBUG_REQ(D_INODE, req, "llog next block");
1197                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1198                 rc = llog_origin_handle_next_block(req);
1199                 break;
1200         case LLOG_ORIGIN_HANDLE_READ_HEADER:
1201                 DEBUG_REQ(D_INODE, req, "llog read header");
1202                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1203                 rc = llog_origin_handle_read_header(req);
1204                 break;
1205         case LLOG_ORIGIN_HANDLE_CLOSE:
1206                 DEBUG_REQ(D_INODE, req, "llog close");
1207                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1208                 rc = llog_origin_handle_close(req);
1209                 break;
1210         case LLOG_CATINFO:
1211                 DEBUG_REQ(D_INODE, req, "llog catinfo");
1212                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1213                 rc = llog_catinfo(req);
1214                 break;
1215         default:
1216                 req->rq_status = -ENOTSUPP;
1217                 rc = ptlrpc_error(req);
1218                 RETURN(rc);
1219         }
1220
1221         LASSERT(current->journal_info == NULL);
1222
1223         EXIT;
1224
1225         /* If we're DISCONNECTing, the mds_export_data is already freed */
1226         if (!rc && req->rq_reqmsg->opc != MDS_DISCONNECT) {
1227                 struct mds_export_data *med = &req->rq_export->exp_mds_data;
1228                 struct obd_device *obd = list_entry(mds, struct obd_device,
1229                                                     u.mds);
1230                 req->rq_repmsg->last_xid =
1231                         le64_to_cpu(med->med_mcd->mcd_last_xid);
1232
1233                 if (!obd->obd_no_transno) {
1234                         req->rq_repmsg->last_committed =
1235                                 obd->obd_last_committed;
1236                 } else {
1237                         DEBUG_REQ(D_IOCTL, req,
1238                                   "not sending last_committed update");
1239                 }
1240                 CDEBUG(D_INFO, "last_transno "LPU64", last_committed "LPU64
1241                        ", xid "LPU64"\n",
1242                        mds->mds_last_transno, obd->obd_last_committed,
1243                        req->rq_xid);
1244         }
1245  out:
1246
1247         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LAST_REPLAY) {
1248                 if (obd && obd->obd_recovering) {
1249                         DEBUG_REQ(D_HA, req, "LAST_REPLAY, queuing reply");
1250                         return target_queue_final_reply(req, rc);
1251                 }
1252                 /* Lost a race with recovery; let the error path DTRT. */
1253                 rc = req->rq_status = -ENOTCONN;
1254         }
1255
1256         target_send_reply(req, rc, fail);
1257         return 0;
1258 }
1259
1260 /* Update the server data on disk.  This stores the new mount_count and
1261  * also the last_rcvd value to disk.  If we don't have a clean shutdown,
1262  * then the server last_rcvd value may be less than that of the clients.
1263  * This will alert us that we may need to do client recovery.
1264  *
1265  * Also assumes for mds_last_transno that we are not modifying it (no locking).
1266  */
1267 int mds_update_server_data(struct obd_device *obd, int force_sync)
1268 {
1269         struct mds_obd *mds = &obd->u.mds;
1270         struct mds_server_data *msd = mds->mds_server_data;
1271         struct file *filp = mds->mds_rcvd_filp;
1272         struct obd_run_ctxt saved;
1273         loff_t off = 0;
1274         int rc;
1275         ENTRY;
1276
1277         push_ctxt(&saved, &obd->obd_ctxt, NULL);
1278         msd->msd_last_transno = cpu_to_le64(mds->mds_last_transno);
1279
1280         CDEBUG(D_SUPER, "MDS mount_count is "LPU64", last_transno is "LPU64"\n",
1281                mds->mds_mount_count, mds->mds_last_transno);
1282         rc = fsfilt_write_record(obd, filp, msd, sizeof(*msd), &off,force_sync);
1283         if (rc)
1284                 CERROR("error writing MDS server data: rc = %d\n", rc);
1285         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
1286
1287         RETURN(rc);
1288 }
1289
1290
1291 /* mount the file system (secretly) */
1292 static int mds_setup(struct obd_device *obd, obd_count len, void *buf)
1293 {
1294         struct lustre_cfg* lcfg = buf;
1295         struct mds_obd *mds = &obd->u.mds;
1296         struct vfsmount *mnt;
1297         int rc = 0;
1298         unsigned long page;
1299         ENTRY;
1300
1301         dev_clear_rdonly(2);
1302
1303         if (!lcfg->lcfg_inlbuf1 || !lcfg->lcfg_inlbuf2)
1304                 RETURN(rc = -EINVAL);
1305
1306         obd->obd_fsops = fsfilt_get_ops(lcfg->lcfg_inlbuf2);
1307         if (IS_ERR(obd->obd_fsops))
1308                 RETURN(rc = PTR_ERR(obd->obd_fsops));
1309
1310         if (!(page = __get_free_page(GFP_KERNEL)))
1311                 RETURN(-ENOMEM);
1312
1313         memset((void *)page, 0, PAGE_SIZE);
1314         sprintf((char *)page, "iopen_nopriv");
1315
1316         mnt = do_kern_mount(lcfg->lcfg_inlbuf2, 0,
1317                             lcfg->lcfg_inlbuf1, (void *)page);
1318         free_page(page);
1319         if (IS_ERR(mnt)) {
1320                 rc = PTR_ERR(mnt);
1321                 CERROR("do_kern_mount failed: rc = %d\n", rc);
1322                 GOTO(err_ops, rc);
1323         }
1324
1325         CDEBUG(D_SUPER, "%s: mnt = %p\n", lcfg->lcfg_inlbuf1, mnt);
1326
1327         sema_init(&mds->mds_orphan_recovery_sem, 1);
1328         sema_init(&mds->mds_epoch_sem, 1);
1329         spin_lock_init(&mds->mds_transno_lock);
1330         mds->mds_max_mdsize = sizeof(struct lov_mds_md);
1331         mds->mds_max_cookiesize = sizeof(struct llog_cookie);
1332         atomic_set(&mds->mds_open_count, 0);
1333
1334         obd->obd_namespace = ldlm_namespace_new("mds_server",
1335                                                 LDLM_NAMESPACE_SERVER);
1336         if (obd->obd_namespace == NULL) {
1337                 mds_cleanup(obd, 0);
1338                 GOTO(err_put, rc = -ENOMEM);
1339         }
1340
1341         rc = mds_fs_setup(obd, mnt);
1342         if (rc) {
1343                 CERROR("MDS filesystem method init failed: rc = %d\n", rc);
1344                 GOTO(err_ns, rc);
1345         }
1346
1347         rc = llog_start_commit_thread();
1348         if (rc < 0)
1349                 GOTO(err_fs, rc);
1350
1351
1352         if (lcfg->lcfg_inllen3 > 0 && lcfg->lcfg_inlbuf3) {
1353                 class_uuid_t uuid;
1354
1355                 generate_random_uuid(uuid);
1356                 class_uuid_unparse(uuid, &mds->mds_lov_uuid);
1357
1358                 OBD_ALLOC(mds->mds_profile, lcfg->lcfg_inllen3);
1359                 if (mds->mds_profile == NULL)
1360                         GOTO(err_fs, rc = -ENOMEM);
1361
1362                 memcpy(mds->mds_profile, lcfg->lcfg_inlbuf3,
1363                        lcfg->lcfg_inllen3);
1364
1365         }
1366
1367         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
1368                            "mds_ldlm_client", &obd->obd_ldlm_client);
1369         obd->obd_replayable = 1;
1370
1371         RETURN(0);
1372
1373 err_fs:
1374         /* No extra cleanup needed for llog_init_commit_thread() */
1375         mds_fs_cleanup(obd, 0);
1376 err_ns:
1377         ldlm_namespace_free(obd->obd_namespace, 0);
1378         obd->obd_namespace = NULL;
1379 err_put:
1380         unlock_kernel();
1381         mntput(mds->mds_vfsmnt);
1382         mds->mds_sb = 0;
1383         lock_kernel();
1384 err_ops:
1385         fsfilt_put_ops(obd->obd_fsops);
1386         return rc;
1387 }
1388
1389 static int mds_postsetup(struct obd_device *obd)
1390 {
1391         struct mds_obd *mds = &obd->u.mds;
1392         int rc = 0;
1393         ENTRY;
1394
1395
1396         rc = llog_setup(obd, LLOG_CONFIG_ORIG_CTXT, obd, 0, NULL,
1397                         &llog_lvfs_ops);
1398         if (rc)
1399                 RETURN(rc);
1400
1401         if (mds->mds_profile) {
1402                 struct obd_run_ctxt saved;
1403                 struct lustre_profile *lprof;
1404                 struct config_llog_instance cfg;
1405
1406                 cfg.cfg_instance = NULL;
1407                 cfg.cfg_uuid = mds->mds_lov_uuid;
1408                 push_ctxt(&saved, &obd->obd_ctxt, NULL);
1409                 rc = class_config_parse_llog(llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT),
1410                                              mds->mds_profile, &cfg);
1411                 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
1412                 if (rc)
1413                         GOTO(err_llog, rc);
1414
1415                 lprof = class_get_profile(mds->mds_profile);
1416                 if (lprof == NULL) {
1417                         CERROR("No profile found: %s\n", mds->mds_profile);
1418                         GOTO(err_cleanup, rc = -ENOENT);
1419                 }
1420                 rc = mds_lov_connect(obd, lprof->lp_osc);
1421                 if (rc)
1422                         GOTO(err_cleanup, rc);
1423         }
1424
1425         RETURN(rc);
1426
1427 err_cleanup:
1428         mds_lov_clean(obd);
1429 err_llog:
1430         llog_cleanup(llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT));
1431         RETURN(rc);
1432 }
1433
1434 static int mds_postrecov(struct obd_device *obd)
1435
1436 {
1437         int rc, rc2;
1438
1439         LASSERT(!obd->obd_recovering);
1440
1441         rc = llog_connect(llog_get_context(obd, LLOG_UNLINK_ORIG_CTXT),
1442                           obd->u.mds.mds_lov_desc.ld_tgt_count, NULL, NULL);
1443         if (rc != 0) {
1444                 CERROR("faild at llog_origin_connect: %d\n", rc);
1445         }
1446
1447         rc = mds_cleanup_orphans(obd);
1448
1449         rc2 = mds_lov_set_nextid(obd);
1450         if (rc2 == 0)
1451                 rc2 = rc;
1452         RETURN(rc2);
1453 }
1454
1455 int mds_lov_clean(struct obd_device *obd)
1456 {
1457         struct mds_obd *mds = &obd->u.mds;
1458
1459         if (mds->mds_profile) {
1460                 char * cln_prof;
1461                 struct config_llog_instance cfg;
1462                 struct obd_run_ctxt saved;
1463                 int len = strlen(mds->mds_profile) + sizeof("-clean") + 1;
1464
1465                 OBD_ALLOC(cln_prof, len);
1466                 sprintf(cln_prof, "%s-clean", mds->mds_profile);
1467
1468                 cfg.cfg_instance = NULL;
1469                 cfg.cfg_uuid = mds->mds_lov_uuid;
1470
1471                 push_ctxt(&saved, &obd->obd_ctxt, NULL);
1472                 class_config_parse_llog(llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT),
1473                                         cln_prof, &cfg);
1474                 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
1475
1476                 OBD_FREE(cln_prof, len);
1477                 OBD_FREE(mds->mds_profile, strlen(mds->mds_profile) + 1);
1478                 mds->mds_profile = NULL;
1479         }
1480         RETURN(0);
1481 }
1482
1483 static int mds_precleanup(struct obd_device *obd, int flags)
1484 {
1485         int rc = 0;
1486         ENTRY;
1487
1488         mds_lov_disconnect(obd, flags);
1489         mds_lov_clean(obd);
1490         llog_cleanup(llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT));
1491         RETURN(rc);
1492 }
1493
1494 static int mds_cleanup(struct obd_device *obd, int flags)
1495 {
1496         struct mds_obd *mds = &obd->u.mds;
1497         ENTRY;
1498
1499         if (mds->mds_sb == NULL)
1500                 RETURN(0);
1501
1502         mds_update_server_data(obd, 1);
1503         if (mds->mds_lov_objids != NULL) {
1504                 OBD_FREE(mds->mds_lov_objids,
1505                          mds->mds_lov_desc.ld_tgt_count * sizeof(obd_id));
1506         }
1507         mds_fs_cleanup(obd, flags);
1508
1509         unlock_kernel();
1510
1511         /* 2 seems normal on mds, (may_umount() also expects 2
1512           fwiw), but we only see 1 at this point in obdfilter. */
1513         if (atomic_read(&obd->u.mds.mds_vfsmnt->mnt_count) > 2)
1514                 CERROR("%s: mount busy, mnt_count %d != 2\n", obd->obd_name,
1515                        atomic_read(&obd->u.mds.mds_vfsmnt->mnt_count));
1516
1517         mntput(mds->mds_vfsmnt);
1518
1519         mds->mds_sb = 0;
1520
1521         ldlm_namespace_free(obd->obd_namespace, flags & OBD_OPT_FORCE);
1522
1523         if (obd->obd_recovering)
1524                 target_cancel_recovery_timer(obd);
1525         lock_kernel();
1526         dev_clear_rdonly(2);
1527         fsfilt_put_ops(obd->obd_fsops);
1528
1529         RETURN(0);
1530 }
1531
1532 static void fixup_handle_for_resent_req(struct ptlrpc_request *req,
1533                                         struct ldlm_lock *new_lock,
1534                                         struct lustre_handle *lockh)
1535 {
1536         struct obd_export *exp = req->rq_export;
1537         struct obd_device *obd = exp->exp_obd;
1538         struct ldlm_request *dlmreq =
1539                 lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*dlmreq));
1540         struct lustre_handle remote_hdl = dlmreq->lock_handle1;
1541         struct list_head *iter;
1542
1543         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
1544                 return;
1545
1546         l_lock(&obd->obd_namespace->ns_lock);
1547         list_for_each(iter, &exp->exp_ldlm_data.led_held_locks) {
1548                 struct ldlm_lock *lock;
1549                 lock = list_entry(iter, struct ldlm_lock, l_export_chain);
1550                 if (lock == new_lock)
1551                         continue;
1552                 if (lock->l_remote_handle.cookie == remote_hdl.cookie) {
1553                         lockh->cookie = lock->l_handle.h_cookie;
1554                         DEBUG_REQ(D_HA, req, "restoring lock cookie "LPX64,
1555                                   lockh->cookie);
1556                         l_unlock(&obd->obd_namespace->ns_lock);
1557                         return;
1558                 }
1559         }
1560         l_unlock(&obd->obd_namespace->ns_lock);
1561
1562         /* This remote handle isn't enqueued, so we never received or
1563          * processed this request.  Clear MSG_RESENT, because it can
1564          * be handled like any normal request now. */
1565
1566         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1567
1568         DEBUG_REQ(D_HA, req, "no existing lock with rhandle "LPX64,
1569                   remote_hdl.cookie);
1570 }
1571
1572 int intent_disposition(struct ldlm_reply *rep, int flag)
1573 {
1574         if (!rep)
1575                 return 0;
1576         return (rep->lock_policy_res1 & flag);
1577 }
1578
1579 void intent_set_disposition(struct ldlm_reply *rep, int flag)
1580 {
1581         if (!rep)
1582                 return;
1583         rep->lock_policy_res1 |= flag;
1584 }
1585
1586 static int ldlm_intent_policy(struct ldlm_namespace *ns,
1587                               struct ldlm_lock **lockp, void *req_cookie,
1588                               ldlm_mode_t mode, int flags, void *data)
1589 {
1590         struct ptlrpc_request *req = req_cookie;
1591         struct ldlm_lock *lock = *lockp;
1592         int rc;
1593         ENTRY;
1594
1595         if (!req_cookie)
1596                 RETURN(0);
1597
1598         if (req->rq_reqmsg->bufcount > 1) {
1599                 /* an intent needs to be considered */
1600                 struct ldlm_intent *it;
1601                 struct mds_obd *mds = &req->rq_export->exp_obd->u.mds;
1602                 struct ldlm_reply *rep;
1603                 struct lustre_handle lockh = { 0 };
1604                 struct ldlm_lock *new_lock;
1605                 int offset = 2, repsize[4] = {sizeof(struct ldlm_reply),
1606                                               sizeof(struct mds_body),
1607                                               mds->mds_max_mdsize,
1608                                               mds->mds_max_cookiesize};
1609
1610                 it = lustre_swab_reqbuf(req, 1, sizeof (*it),
1611                                         lustre_swab_ldlm_intent);
1612                 if (it == NULL) {
1613                         CERROR ("Intent missing\n");
1614                         req->rq_status = -EFAULT;
1615                         RETURN(req->rq_status);
1616                 }
1617
1618                 LDLM_DEBUG(lock, "intent policy, opc: %s",
1619                            ldlm_it2str(it->opc));
1620
1621                 rc = lustre_pack_reply(req, it->opc == IT_UNLINK ? 4 : 3,
1622                                        repsize, NULL);
1623                 if (rc)
1624                         RETURN(req->rq_status = rc);
1625
1626                 rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*rep));
1627                 intent_set_disposition(rep, DISP_IT_EXECD);
1628
1629                 fixup_handle_for_resent_req(req, lock, &lockh);
1630
1631                 /* execute policy */
1632                 switch ((long)it->opc) {
1633                 case IT_OPEN:
1634                 case IT_CREAT|IT_OPEN:
1635                         /* XXX swab here to assert that an mds_open reint
1636                          * packet is following */
1637                         rep->lock_policy_res2 = mds_reint(req, offset, &lockh);
1638 #if 0
1639                         /* We abort the lock if the lookup was negative and
1640                          * we did not make it to the OPEN portion */
1641                         if (!intent_disposition(rep, DISP_LOOKUP_EXECD))
1642                                 RETURN(ELDLM_LOCK_ABORTED);
1643                         if (intent_disposition(rep, DISP_LOOKUP_NEG) &&
1644                             !intent_disposition(rep, DISP_OPEN_OPEN))
1645 #endif
1646                                 RETURN(ELDLM_LOCK_ABORTED);
1647                         break;
1648                 case IT_GETATTR:
1649                 case IT_LOOKUP:
1650                 case IT_READDIR:
1651                         rep->lock_policy_res2 = mds_getattr_name(offset, req,
1652                                                                  &lockh);
1653                         /* FIXME: LDLM can set req->rq_status. MDS sets
1654                            policy_res{1,2} with disposition and status.
1655                            - replay: returns 0 & req->status is old status
1656                            - otherwise: returns req->status */
1657                         if (intent_disposition(rep, DISP_LOOKUP_NEG))
1658                                 rep->lock_policy_res2 = 0;
1659                         if (!intent_disposition(rep, DISP_LOOKUP_POS) ||
1660                             rep->lock_policy_res2)
1661                                 RETURN(ELDLM_LOCK_ABORTED);
1662                         if (req->rq_status != 0) {
1663                                 LBUG();
1664                                 rep->lock_policy_res2 = req->rq_status;
1665                                 RETURN(ELDLM_LOCK_ABORTED);
1666                         }
1667                         break;
1668                 default:
1669                         CERROR("Unhandled intent "LPD64"\n", it->opc);
1670                         LBUG();
1671                 }
1672
1673                 /* By this point, whatever function we called above must have
1674                  * either filled in 'lockh', been an intent replay, or returned
1675                  * an error.  We want to allow replayed RPCs to not get a lock,
1676                  * since we would just drop it below anyways because lock replay
1677                  * is done separately by the client afterwards.  For regular
1678                  * RPCs we want to give the new lock to the client instead of
1679                  * whatever lock it was about to get.
1680                  */
1681                 new_lock = ldlm_handle2lock(&lockh);
1682                 if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY))
1683                         RETURN(0);
1684
1685                 LASSERT(new_lock != NULL);
1686
1687                 /* If we've already given this lock to a client once, then we
1688                  * should have no readers or writers.  Otherwise, we should
1689                  * have one reader _or_ writer ref (which will be zeroed below)
1690                  * before returning the lock to a client.
1691                  */
1692                 if (new_lock->l_export == req->rq_export) {
1693                         LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
1694                 } else {
1695                         LASSERT(new_lock->l_export == NULL);
1696                         LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
1697                 }
1698
1699                 *lockp = new_lock;
1700
1701                 if (new_lock->l_export == req->rq_export) {
1702                         /* Already gave this to the client, which means that we
1703                          * reconstructed a reply. */
1704                         LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
1705                                 MSG_RESENT);
1706                         RETURN(ELDLM_LOCK_REPLACED);
1707                 }
1708
1709                 /* Fixup the lock to be given to the client */
1710                 l_lock(&new_lock->l_resource->lr_namespace->ns_lock);
1711                 new_lock->l_readers = 0;
1712                 new_lock->l_writers = 0;
1713
1714                 new_lock->l_export = class_export_get(req->rq_export);
1715                 list_add(&new_lock->l_export_chain,
1716                          &new_lock->l_export->exp_ldlm_data.led_held_locks);
1717
1718                 new_lock->l_blocking_ast = lock->l_blocking_ast;
1719                 new_lock->l_completion_ast = lock->l_completion_ast;
1720
1721                 memcpy(&new_lock->l_remote_handle, &lock->l_remote_handle,
1722                        sizeof(lock->l_remote_handle));
1723
1724                 new_lock->l_flags &= ~LDLM_FL_LOCAL;
1725
1726                 LDLM_LOCK_PUT(new_lock);
1727                 l_unlock(&new_lock->l_resource->lr_namespace->ns_lock);
1728
1729                 RETURN(ELDLM_LOCK_REPLACED);
1730         } else {
1731                 int size = sizeof(struct ldlm_reply);
1732                 rc = lustre_pack_reply(req, 1, &size, NULL);
1733                 if (rc) {
1734                         LBUG();
1735                         RETURN(-ENOMEM);
1736                 }
1737         }
1738         RETURN(0);
1739 }
1740
1741 int mds_attach(struct obd_device *dev, obd_count len, void *data)
1742 {
1743         struct lprocfs_static_vars lvars;
1744
1745         lprocfs_init_multi_vars(0, &lvars);
1746         return lprocfs_obd_attach(dev, lvars.obd_vars);
1747 }
1748
1749 int mds_detach(struct obd_device *dev)
1750 {
1751         return lprocfs_obd_detach(dev);
1752 }
1753
1754 int mdt_attach(struct obd_device *dev, obd_count len, void *data)
1755 {
1756         struct lprocfs_static_vars lvars;
1757
1758         lprocfs_init_multi_vars(1, &lvars);
1759         return lprocfs_obd_attach(dev, lvars.obd_vars);
1760 }
1761
1762 int mdt_detach(struct obd_device *dev)
1763 {
1764         return lprocfs_obd_detach(dev);
1765 }
1766
1767 static int mdt_setup(struct obd_device *obddev, obd_count len, void *buf)
1768 {
1769         struct mds_obd *mds = &obddev->u.mds;
1770         int rc = 0;
1771         ENTRY;
1772
1773         mds->mds_service = ptlrpc_init_svc(MDS_NEVENTS, MDS_NBUFS,
1774                                            MDS_BUFSIZE, MDS_MAXREQSIZE,
1775                                            MDS_REQUEST_PORTAL, MDC_REPLY_PORTAL,
1776                                            mds_handle, "mds",
1777                                            obddev->obd_proc_entry);
1778
1779         if (!mds->mds_service) {
1780                 CERROR("failed to start service\n");
1781                 RETURN(rc = -ENOMEM);
1782         }
1783
1784         rc = ptlrpc_start_n_threads(obddev, mds->mds_service, MDT_NUM_THREADS,
1785                                     "ll_mdt");
1786         if (rc)
1787                 GOTO(err_thread, rc);
1788
1789         mds->mds_setattr_service =
1790                 ptlrpc_init_svc(MDS_NEVENTS, MDS_NBUFS,
1791                                 MDS_BUFSIZE, MDS_MAXREQSIZE,
1792                                 MDS_SETATTR_PORTAL, MDC_REPLY_PORTAL,
1793                                 mds_handle, "mds_setattr",
1794                                 obddev->obd_proc_entry);
1795         if (!mds->mds_setattr_service) {
1796                 CERROR("failed to start getattr service\n");
1797                 GOTO(err_thread, rc = -ENOMEM);
1798         }
1799
1800         rc = ptlrpc_start_n_threads(obddev, mds->mds_setattr_service,
1801                                  MDT_NUM_THREADS, "ll_mdt_attr");
1802         if (rc)
1803                 GOTO(err_thread2, rc);
1804
1805         mds->mds_readpage_service =
1806                 ptlrpc_init_svc(MDS_NEVENTS, MDS_NBUFS,
1807                                 MDS_BUFSIZE, MDS_MAXREQSIZE,
1808                                 MDS_READPAGE_PORTAL, MDC_REPLY_PORTAL,
1809                                 mds_handle, "mds_readpage",
1810                                 obddev->obd_proc_entry);
1811         if (!mds->mds_readpage_service) {
1812                 CERROR("failed to start readpage service\n");
1813                 GOTO(err_thread2, rc = -ENOMEM);
1814         }
1815
1816         rc = ptlrpc_start_n_threads(obddev, mds->mds_readpage_service,
1817                                     MDT_NUM_THREADS, "ll_mdt_rdpg");
1818
1819         if (rc)
1820                 GOTO(err_thread3, rc);
1821
1822         RETURN(0);
1823
1824 err_thread3:
1825         ptlrpc_unregister_service(mds->mds_readpage_service);
1826 err_thread2:
1827         ptlrpc_unregister_service(mds->mds_setattr_service);
1828 err_thread:
1829         ptlrpc_unregister_service(mds->mds_service);
1830         return rc;
1831 }
1832
1833
1834 static int mdt_cleanup(struct obd_device *obddev, int flags)
1835 {
1836         struct mds_obd *mds = &obddev->u.mds;
1837         ENTRY;
1838
1839         ptlrpc_stop_all_threads(mds->mds_readpage_service);
1840         ptlrpc_unregister_service(mds->mds_readpage_service);
1841
1842         ptlrpc_stop_all_threads(mds->mds_setattr_service);
1843         ptlrpc_unregister_service(mds->mds_setattr_service);
1844
1845         ptlrpc_stop_all_threads(mds->mds_service);
1846         ptlrpc_unregister_service(mds->mds_service);
1847
1848         RETURN(0);
1849 }
1850
1851 static struct dentry *mds_lvfs_fid2dentry(__u64 id, __u32 gen, __u64 gr, void *data)
1852 {
1853         struct obd_device *obd = data;
1854         struct ll_fid fid;
1855         fid.id = id;
1856         fid.generation = gen;
1857         return mds_fid2dentry(&obd->u.mds, &fid, NULL);
1858 }
1859
1860 struct lvfs_callback_ops mds_lvfs_ops = {
1861         l_fid2dentry:     mds_lvfs_fid2dentry,
1862 };
1863
1864 /* use obd ops to offer management infrastructure */
1865 static struct obd_ops mds_obd_ops = {
1866         o_owner:       THIS_MODULE,
1867         o_attach:      mds_attach,
1868         o_detach:      mds_detach,
1869         o_connect:     mds_connect,
1870         o_init_export:  mds_init_export,
1871         o_destroy_export:  mds_destroy_export,
1872         o_disconnect:  mds_disconnect,
1873         o_setup:       mds_setup,
1874         o_postsetup:   mds_postsetup,
1875         o_precleanup:  mds_precleanup,
1876         o_cleanup:     mds_cleanup,
1877         o_postrecov:   mds_postrecov,
1878         o_statfs:      mds_obd_statfs,
1879         o_iocontrol:   mds_iocontrol,
1880         o_create:      mds_obd_create,
1881         o_destroy:     mds_obd_destroy,
1882         o_llog_init:   mds_llog_init,
1883         o_llog_finish: mds_llog_finish,
1884         o_notify:      mds_notify,
1885 };
1886
1887 static struct obd_ops mdt_obd_ops = {
1888         o_owner:       THIS_MODULE,
1889         o_attach:      mdt_attach,
1890         o_detach:      mdt_detach,
1891         o_setup:       mdt_setup,
1892         o_cleanup:     mdt_cleanup,
1893 };
1894
1895 static int __init mds_init(void)
1896 {
1897         struct lprocfs_static_vars lvars;
1898
1899         lprocfs_init_multi_vars(0, &lvars);
1900         class_register_type(&mds_obd_ops, lvars.module_vars, LUSTRE_MDS_NAME);
1901         lprocfs_init_multi_vars(1, &lvars);
1902         class_register_type(&mdt_obd_ops, lvars.module_vars, LUSTRE_MDT_NAME);
1903         ldlm_register_intent(ldlm_intent_policy);
1904
1905         return 0;
1906 }
1907
1908 static void /*__exit*/ mds_exit(void)
1909 {
1910         ldlm_unregister_intent();
1911         class_unregister_type(LUSTRE_MDS_NAME);
1912         class_unregister_type(LUSTRE_MDT_NAME);
1913 }
1914
1915 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1916 MODULE_DESCRIPTION("Lustre Metadata Server (MDS)");
1917 MODULE_LICENSE("GPL");
1918
1919 module_init(mds_init);
1920 module_exit(mds_exit);