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/obd_ost.h>
  53 #include <linux/lustre_mds.h>
  54 #include <linux/lustre_fsfilt.h>
  55 #include <linux/lustre_snap.h>
  56 #include <linux/lprocfs_status.h>
  57 #include <linux/lustre_commit_confd.h>
  58
  59 #include "mds_internal.h"
  60
  61 static int mds_intent_policy(struct ldlm_namespace *ns,
  62                              struct ldlm_lock **lockp, void *req_cookie,
  63                              ldlm_mode_t mode, int flags, void *data);
  64 static int mds_postsetup(struct obd_device *obd);
  65 static int mds_cleanup(struct obd_device *obd, int flags);
  66
  67 /* Assumes caller has already pushed into the kernel filesystem context */
  68 static int mds_sendpage(struct ptlrpc_request *req, struct file *file,
  69                         loff_t offset, int count)
  70 {
  71         struct ptlrpc_bulk_desc *desc;
  72         struct l_wait_info lwi;
  73         struct page **pages;
  74         int rc = 0, npages, i, tmpcount, tmpsize = 0;
  75         ENTRY;
  76
  77         LASSERT((offset & (PAGE_SIZE - 1)) == 0); /* I'm dubious about this */
  78
  79         npages = (count + PAGE_SIZE - 1) >> PAGE_SHIFT;
  80         OBD_ALLOC(pages, sizeof(*pages) * npages);
  81         if (!pages)
  82                 GOTO(out, rc = -ENOMEM);
  83
  84         desc = ptlrpc_prep_bulk_exp(req, npages, BULK_PUT_SOURCE,
  85                                     MDS_BULK_PORTAL);
  86         if (desc == NULL)
  87                 GOTO(out_free, rc = -ENOMEM);
  88
  89         for (i = 0, tmpcount = count; i < npages; i++, tmpcount -= tmpsize) {
  90                 tmpsize = tmpcount > PAGE_SIZE ? PAGE_SIZE : tmpcount;
  91
  92                 pages[i] = alloc_pages(GFP_KERNEL, 0);
  93                 if (pages[i] == NULL)
  94                         GOTO(cleanup_buf, rc = -ENOMEM);
  95
  96                 ptlrpc_prep_bulk_page(desc, pages[i], 0, tmpsize);
  97         }
  98
  99         for (i = 0, tmpcount = count; i < npages; i++, tmpcount -= tmpsize) {
 100                 tmpsize = tmpcount > PAGE_SIZE ? PAGE_SIZE : tmpcount;
 101                 CDEBUG(D_EXT2, "reading %u@%llu from dir %lu (size %llu)\n",
 102                        tmpsize, offset, file->f_dentry->d_inode->i_ino,
 103                        file->f_dentry->d_inode->i_size);
 104
 105                 rc = fsfilt_readpage(req->rq_export->exp_obd, file,
 106                                      kmap(pages[i]), tmpsize, &offset);
 107                 kunmap(pages[i]);
 108
 109                 if (rc != tmpsize)
 110                         GOTO(cleanup_buf, rc = -EIO);
 111         }
 112
 113         LASSERT(desc->bd_nob == count);
 114
 115         rc = ptlrpc_start_bulk_transfer(desc);
 116         if (rc)
 117                 GOTO(cleanup_buf, rc);
 118
 119         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
 120                 CERROR("obd_fail_loc=%x, fail operation rc=%d\n",
 121                        OBD_FAIL_MDS_SENDPAGE, rc);
 122                 GOTO(abort_bulk, rc);
 123         }
 124
 125         lwi = LWI_TIMEOUT(obd_timeout * HZ / 4, NULL, NULL);
 126         rc = l_wait_event(desc->bd_waitq, !ptlrpc_bulk_active(desc), &lwi);
 127         LASSERT (rc == 0 || rc == -ETIMEDOUT);
 128
 129         if (rc == 0) {
 130                 if (desc->bd_success &&
 131                     desc->bd_nob_transferred == count)
 132                         GOTO(cleanup_buf, rc);
 133
 134                 rc = -ETIMEDOUT; /* XXX should this be a different errno? */
 135         }
 136
 137         DEBUG_REQ(D_ERROR, req, "bulk failed: %s %d(%d), evicting %s@%s\n",
 138                   (rc == -ETIMEDOUT) ? "timeout" : "network error",
 139                   desc->bd_nob_transferred, count,
 140                   req->rq_export->exp_client_uuid.uuid,
 141                   req->rq_export->exp_connection->c_remote_uuid.uuid);
 142
 143         ptlrpc_fail_export(req->rq_export);
 144
 145         EXIT;
 146  abort_bulk:
 147         ptlrpc_abort_bulk (desc);
 148  cleanup_buf:
 149         for (i = 0; i < npages; i++)
 150                 if (pages[i])
 151                         __free_pages(pages[i], 0);
 152
 153         ptlrpc_free_bulk(desc);
 154  out_free:
 155         OBD_FREE(pages, sizeof(*pages) * npages);
 156  out:
 157         return rc;
 158 }
 159
 160 int mds_lock_mode_for_dir(struct obd_device *obd,
 161                               struct dentry *dentry, int mode)
 162 {
 163         int ret_mode, split;
 164
 165         /* any dir access needs couple locks:
 166          * 1) on part of dir we gonna lookup/modify in
 167          * 2) on a whole dir to protect it from concurrent splitting
 168          *    and to flush client's cache for readdir()
 169          * so, for a given mode and dentry this routine decides what
 170          * lock mode to use for lock #2:
 171          * 1) if caller's gonna lookup in dir then we need to protect
 172          *    dir from being splitted only - LCK_CR
 173          * 2) if caller's gonna modify dir then we need to protect
 174          *    dir from being splitted and to flush cache - LCK_CW
 175          * 3) if caller's gonna modify dir and that dir seems ready
 176          *    for splitting then we need to protect it from any
 177          *    type of access (lookup/modify/split) - LCK_EX -bzzz */
 178
 179         split = mds_splitting_expected(obd, dentry);
 180         if (split == MDS_NO_SPLITTABLE) {
 181                 /* this inode won't be splitted. so we need not to protect from
 182                  * just flush client's cache on modification */
 183                 ret_mode = 0;
 184                 if (mode == LCK_PW)
 185                         ret_mode = LCK_CW;
 186         } else {
 187                 if (mode == LCK_PR) {
 188                         ret_mode = LCK_CR;
 189                 } else if (mode == LCK_PW) {
 190                         /* caller gonna modify directory.we use concurrent
 191                            write lock here to retract client's cache for readdir */
 192                         ret_mode = LCK_CW;
 193                         if (split == MDS_EXPECT_SPLIT) {
 194                                 /* splitting possible. serialize any access
 195                                  * the idea is that first one seen dir is
 196                                  * splittable is given exclusive lock and
 197                                  * split directory. caller passes lock mode
 198                                  * to mds_try_to_split_dir() and splitting
 199                                  * would be done with exclusive lock only -bzzz */
 200                                 CDEBUG(D_OTHER, "%s: gonna split %u/%u\n",
 201                                        obd->obd_name,
 202                                        (unsigned) dentry->d_inode->i_ino,
 203                                        (unsigned) dentry->d_inode->i_generation);
 204                                 ret_mode = LCK_EX;
 205                         }
 206                 } else {
 207                         CWARN("unexpected lock mode %d\n", mode);
 208                         ret_mode = LCK_EX;
 209                 }
 210         }
 211         return ret_mode;
 212 }
 213
 214 /* only valid locked dentries or errors should be returned */
 215 struct dentry *mds_fid2locked_dentry(struct obd_device *obd, struct ll_fid *fid,
 216                                      struct vfsmount **mnt, int lock_mode,
 217                                      struct lustre_handle *lockh, int *mode,
 218                                      char *name, int namelen, __u64 lockpart)
 219 {
 220         struct mds_obd *mds = &obd->u.mds;
 221         struct dentry *de = mds_fid2dentry(mds, fid, mnt), *retval = de;
 222         struct ldlm_res_id res_id = { .name = {0} };
 223         int flags = 0, rc;
 224         ldlm_policy_data_t policy = { .l_inodebits = { lockpart } };
 225
 226         ENTRY;
 227
 228         if (IS_ERR(de))
 229                 RETURN(de);
 230
 231         res_id.name[0] = de->d_inode->i_ino;
 232         res_id.name[1] = de->d_inode->i_generation;
 233         lockh[1].cookie = 0;
 234 #ifdef S_PDIROPS
 235         if (name && IS_PDIROPS(de->d_inode)) {
 236                 ldlm_policy_data_t cpolicy =
 237                         { .l_inodebits = { MDS_INODELOCK_UPDATE } };
 238                 LASSERT(mode != NULL);
 239                 *mode = mds_lock_mode_for_dir(obd, de, lock_mode);
 240                 if (*mode) {
 241                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
 242                                               res_id, LDLM_IBITS,
 243                                               &cpolicy, *mode, &flags,
 244                                               mds_blocking_ast,
 245                                               ldlm_completion_ast, NULL, NULL,
 246                                               NULL, 0, NULL, lockh + 1);
 247                         if (rc != ELDLM_OK) {
 248                                 l_dput(de);
 249                                 RETURN(ERR_PTR(-ENOLCK));
 250                         }
 251                 }
 252                 flags = 0;
 253
 254                 res_id.name[2] = full_name_hash(name, namelen);
 255
 256                 CDEBUG(D_INFO, "take lock on %lu:%u:"LPX64"\n",
 257                        de->d_inode->i_ino, de->d_inode->i_generation,
 258                        res_id.name[2]);
 259         }
 260 #else
 261 #warning "No PDIROPS support in the kernel"
 262 #endif
 263         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, res_id,
 264                               LDLM_IBITS, &policy, lock_mode, &flags,
 265                               mds_blocking_ast, ldlm_completion_ast, NULL, NULL,
 266                               NULL, 0, NULL, lockh);
 267         if (rc != ELDLM_OK) {
 268                 l_dput(de);
 269                 retval = ERR_PTR(-EIO); /* XXX translate ldlm code */
 270 #ifdef S_PDIROPS
 271                 if (lockh[1].cookie)
 272                         ldlm_lock_decref(lockh + 1, LCK_CW);
 273 #endif
 274         }
 275
 276         RETURN(retval);
 277 }
 278
 279 #ifndef DCACHE_DISCONNECTED
 280 #define DCACHE_DISCONNECTED DCACHE_NFSD_DISCONNECTED
 281 #endif
 282
 283
 284 /* Look up an entry by inode number. */
 285 /* this function ONLY returns valid dget'd dentries with an initialized inode
 286    or errors */
 287 struct dentry *mds_fid2dentry(struct mds_obd *mds, struct ll_fid *fid,
 288                               struct vfsmount **mnt)
 289 {
 290         char fid_name[32];
 291         unsigned long ino = fid->id;
 292         __u32 generation = fid->generation;
 293         struct inode *inode;
 294         struct dentry *result;
 295
 296         if (ino == 0)
 297                 RETURN(ERR_PTR(-ESTALE));
 298
 299         snprintf(fid_name, sizeof(fid_name), "0x%lx", ino);
 300
 301         CDEBUG(D_DENTRY, "--> mds_fid2dentry: ino/gen %lu/%u, sb %p\n",
 302                ino, generation, mds->mds_sb);
 303
 304         /* under ext3 this is neither supposed to return bad inodes
 305            nor NULL inodes. */
 306         result = ll_lookup_one_len(fid_name, mds->mds_fid_de, strlen(fid_name));
 307         if (IS_ERR(result))
 308                 RETURN(result);
 309
 310         inode = result->d_inode;
 311         if (!inode)
 312                 RETURN(ERR_PTR(-ENOENT));
 313
 314         /* here we disabled generation check, as root inode i_generation
 315          * of cache mds and real mds are different. */
 316         if (inode->i_ino != mds->mds_rootfid.id && generation &&
 317                         inode->i_generation != generation) {
 318                 /* we didn't find the right inode.. */
 319                 CERROR("bad inode %lu, link: %lu ct: %d or generation %u/%u\n",
 320                        inode->i_ino, (unsigned long)inode->i_nlink,
 321                        atomic_read(&inode->i_count), inode->i_generation,
 322                        generation);
 323                 dput(result);
 324                 RETURN(ERR_PTR(-ENOENT));
 325         }
 326
 327         if (mnt) {
 328                 *mnt = mds->mds_vfsmnt;
 329                 mntget(*mnt);
 330         }
 331
 332         RETURN(result);
 333 }
 334
 335
 336 /* Establish a connection to the MDS.
 337  *
 338  * This will set up an export structure for the client to hold state data
 339  * about that client, like open files, the last operation number it did
 340  * on the server, etc.
 341  */
 342 static int mds_connect(struct lustre_handle *conn, struct obd_device *obd,
 343                        struct obd_uuid *cluuid, unsigned long connect_flags)
 344 {
 345         struct obd_export *exp;
 346         struct mds_export_data *med; /*  */
 347         struct mds_client_data *mcd;
 348         int rc;
 349         ENTRY;
 350
 351         if (!conn || !obd || !cluuid)
 352                 RETURN(-EINVAL);
 353
 354         /* XXX There is a small race between checking the list and adding a
 355          * new connection for the same UUID, but the real threat (list
 356          * corruption when multiple different clients connect) is solved.
 357          *
 358          * There is a second race between adding the export to the list,
 359          * and filling in the client data below.  Hence skipping the case
 360          * of NULL mcd above.  We should already be controlling multiple
 361          * connects at the client, and we can't hold the spinlock over
 362          * memory allocations without risk of deadlocking.
 363          */
 364         rc = class_connect(conn, obd, cluuid);
 365         if (rc)
 366                 RETURN(rc);
 367         exp = class_conn2export(conn);
 368         LASSERT(exp);
 369         med = &exp->exp_mds_data;
 370
 371         OBD_ALLOC(mcd, sizeof(*mcd));
 372         if (!mcd) {
 373                 CERROR("mds: out of memory for client data\n");
 374                 GOTO(out, rc = -ENOMEM);
 375         }
 376
 377         memcpy(mcd->mcd_uuid, cluuid, sizeof(mcd->mcd_uuid));
 378         med->med_mcd = mcd;
 379
 380         rc = mds_client_add(obd, &obd->u.mds, med, -1);
 381         if (rc)
 382                 GOTO(out, rc);
 383
 384         if (!(connect_flags & OBD_OPT_MDS_CONNECTION)) {
 385                 struct mds_obd *mds = &obd->u.mds;
 386                 if (!(exp->exp_flags & OBD_OPT_REAL_CLIENT)) {
 387                         atomic_inc(&mds->mds_real_clients);
 388                         CDEBUG(D_OTHER,"%s: peer from %s is real client (%d)\n",
 389                                obd->obd_name, exp->exp_client_uuid.uuid,
 390                                atomic_read(&mds->mds_real_clients));
 391                         exp->exp_flags |= OBD_OPT_REAL_CLIENT;
 392                 }
 393                 if (mds->mds_lmv_name)
 394                         rc = mds_lmv_connect(obd, mds->mds_lmv_name);
 395         }
 396         EXIT;
 397 out:
 398         if (rc) {
 399                 OBD_FREE(mcd, sizeof(*mcd));
 400                 class_disconnect(exp, 0);
 401         }
 402         class_export_put(exp);
 403
 404         return rc;
 405 }
 406
 407 static int mds_init_export(struct obd_export *exp)
 408 {
 409         struct mds_export_data *med = &exp->exp_mds_data;
 410
 411         INIT_LIST_HEAD(&med->med_open_head);
 412         spin_lock_init(&med->med_open_lock);
 413         RETURN(0);
 414 }
 415
 416 static int mds_destroy_export(struct obd_export *export)
 417 {
 418         struct mds_export_data *med;
 419         struct obd_device *obd = export->exp_obd;
 420         struct lvfs_run_ctxt saved;
 421         int rc = 0;
 422         ENTRY;
 423
 424         med = &export->exp_mds_data;
 425         target_destroy_export(export);
 426
 427         if (obd_uuid_equals(&export->exp_client_uuid, &obd->obd_uuid))
 428                 GOTO(out, 0);
 429
 430         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 431
 432         /* Close any open files (which may also cause orphan unlinking). */
 433         spin_lock(&med->med_open_lock);
 434         while (!list_empty(&med->med_open_head)) {
 435                 struct list_head *tmp = med->med_open_head.next;
 436                 struct mds_file_data *mfd =
 437                         list_entry(tmp, struct mds_file_data, mfd_list);
 438                 BDEVNAME_DECLARE_STORAGE(btmp);
 439
 440                 /* bug 1579: fix force-closing for 2.5 */
 441                 struct dentry *dentry = mfd->mfd_dentry;
 442
 443                 list_del(&mfd->mfd_list);
 444                 spin_unlock(&med->med_open_lock);
 445
 446                 /* If you change this message, be sure to update
 447                  * replay_single:test_46 */
 448                 CERROR("force closing client file handle for %*s (%s:%lu)\n",
 449                        dentry->d_name.len, dentry->d_name.name,
 450                        ll_bdevname(dentry->d_inode->i_sb, btmp),
 451                        dentry->d_inode->i_ino);
 452                 rc = mds_mfd_close(NULL, obd, mfd,
 453                                    !(export->exp_flags & OBD_OPT_FAILOVER));
 454
 455                 if (rc)
 456                         CDEBUG(D_INODE, "Error closing file: %d\n", rc);
 457                 spin_lock(&med->med_open_lock);
 458         }
 459         spin_unlock(&med->med_open_lock);
 460         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 461
 462 out:
 463         mds_client_free(export, !(export->exp_flags & OBD_OPT_FAILOVER));
 464
 465         RETURN(rc);
 466 }
 467
 468 static int mds_disconnect(struct obd_export *exp, int flags)
 469 {
 470         struct obd_device *obd;
 471         struct mds_obd *mds;
 472         unsigned long irqflags;
 473         int rc;
 474         ENTRY;
 475
 476         LASSERT(exp);
 477         class_export_get(exp);
 478
 479         obd = class_exp2obd(exp);
 480         if (obd == NULL) {
 481                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
 482                        exp->exp_handle.h_cookie);
 483                 RETURN(-EINVAL);
 484         }
 485         mds = &obd->u.mds;
 486
 487         if (!(exp->exp_flags & OBD_OPT_REAL_CLIENT)
 488                         && !atomic_read(&mds->mds_real_clients)) {
 489                 /* there was no client at all */
 490                 mds_lmv_disconnect(obd, flags);
 491         }
 492
 493         if ((exp->exp_flags & OBD_OPT_REAL_CLIENT)
 494                         && atomic_dec_and_test(&mds->mds_real_clients)) {
 495                 /* time to drop LMV connections */
 496                 CDEBUG(D_OTHER, "%s: last real client %s disconnected.  "
 497                        "Disconnnect from LMV now\n",
 498                        obd->obd_name, exp->exp_client_uuid.uuid);
 499                 mds_lmv_disconnect(obd, flags);
 500         }
 501
 502         spin_lock_irqsave(&exp->exp_lock, irqflags);
 503         exp->exp_flags = flags;
 504         spin_unlock_irqrestore(&exp->exp_lock, irqflags);
 505
 506         /* Disconnect early so that clients can't keep using export */
 507         rc = class_disconnect(exp, flags);
 508         ldlm_cancel_locks_for_export(exp);
 509
 510         /* complete all outstanding replies */
 511         spin_lock_irqsave(&exp->exp_lock, irqflags);
 512         while (!list_empty(&exp->exp_outstanding_replies)) {
 513                 struct ptlrpc_reply_state *rs =
 514                         list_entry(exp->exp_outstanding_replies.next,
 515                                    struct ptlrpc_reply_state, rs_exp_list);
 516                 struct ptlrpc_service *svc = rs->rs_srv_ni->sni_service;
 517
 518                 spin_lock(&svc->srv_lock);
 519                 list_del_init(&rs->rs_exp_list);
 520                 ptlrpc_schedule_difficult_reply(rs);
 521                 spin_unlock(&svc->srv_lock);
 522         }
 523         spin_unlock_irqrestore(&exp->exp_lock, irqflags);
 524
 525         class_export_put(exp);
 526         RETURN(rc);
 527 }
 528
 529 static int mds_getstatus(struct ptlrpc_request *req)
 530 {
 531         struct mds_obd *mds = mds_req2mds(req);
 532         struct mds_body *body;
 533         int rc, size = sizeof(*body);
 534         ENTRY;
 535
 536         rc = lustre_pack_reply(req, 1, &size, NULL);
 537         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK)) {
 538                 CERROR("mds: out of memory for message: size=%d\n", size);
 539                 req->rq_status = -ENOMEM;       /* superfluous? */
 540                 RETURN(-ENOMEM);
 541         }
 542
 543         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 544         memcpy(&body->fid1, &mds->mds_rootfid, sizeof(body->fid1));
 545
 546         /* the last_committed and last_xid fields are filled in for all
 547          * replies already - no need to do so here also.
 548          */
 549         RETURN(0);
 550 }
 551
 552 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 553                      void *data, int flag)
 554 {
 555         int do_ast;
 556         ENTRY;
 557
 558         if (flag == LDLM_CB_CANCELING) {
 559                 /* Don't need to do anything here. */
 560                 RETURN(0);
 561         }
 562
 563         /* XXX layering violation!  -phil */
 564         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 565         /* Get this: if mds_blocking_ast is racing with mds_intent_policy,
 566          * such that mds_blocking_ast is called just before l_i_p takes the
 567          * ns_lock, then by the time we get the lock, we might not be the
 568          * correct blocking function anymore.  So check, and return early, if
 569          * so. */
 570         if (lock->l_blocking_ast != mds_blocking_ast) {
 571                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 572                 RETURN(0);
 573         }
 574
 575         lock->l_flags |= LDLM_FL_CBPENDING;
 576         do_ast = (!lock->l_readers && !lock->l_writers);
 577         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 578
 579         if (do_ast) {
 580                 struct lustre_handle lockh;
 581                 int rc;
 582
 583                 LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
 584                 ldlm_lock2handle(lock, &lockh);
 585                 rc = ldlm_cli_cancel(&lockh);
 586                 if (rc < 0)
 587                         CERROR("ldlm_cli_cancel: %d\n", rc);
 588         } else {
 589                 LDLM_DEBUG(lock, "Lock still has references, will be "
 590                            "cancelled later");
 591         }
 592         RETURN(0);
 593 }
 594
 595 int mds_get_md(struct obd_device *obd, struct inode *inode, void *md,
 596                int *size, int lock)
 597 {
 598         int rc = 0;
 599         int lmm_size;
 600
 601         if (lock)
 602                 down(&inode->i_sem);
 603         rc = fsfilt_get_md(obd, inode, md, *size);
 604         if (lock)
 605                 up(&inode->i_sem);
 606
 607         if (rc < 0) {
 608                 CERROR("Error %d reading eadata for ino %lu\n",
 609                        rc, inode->i_ino);
 610         } else if (rc > 0) {
 611                 lmm_size = rc;
 612
 613                 if (S_ISREG(inode->i_mode))
 614                         rc = mds_convert_lov_ea(obd, inode, md, lmm_size);
 615                 if (S_ISDIR(inode->i_mode))
 616                         rc = mds_convert_mea_ea(obd, inode, md, lmm_size);
 617
 618                 if (rc == 0) {
 619                         *size = lmm_size;
 620                         rc = lmm_size;
 621                 } else if (rc > 0) {
 622                         *size = rc;
 623                 }
 624         }
 625
 626         RETURN (rc);
 627 }
 628
 629
 630 /* Call with lock=1 if you want mds_pack_md to take the i_sem.
 631  * Call with lock=0 if the caller has already taken the i_sem. */
 632 int mds_pack_md(struct obd_device *obd, struct lustre_msg *msg, int offset,
 633                 struct mds_body *body, struct inode *inode, int lock)
 634 {
 635         struct mds_obd *mds = &obd->u.mds;
 636         void *lmm;
 637         int lmm_size;
 638         int rc;
 639         ENTRY;
 640
 641         lmm = lustre_msg_buf(msg, offset, 0);
 642         if (lmm == NULL) {
 643                 /* Some problem with getting eadata when I sized the reply
 644                  * buffer... */
 645                 CDEBUG(D_INFO, "no space reserved for inode %lu MD\n",
 646                        inode->i_ino);
 647                 RETURN(0);
 648         }
 649         lmm_size = msg->buflens[offset];
 650
 651         /* I don't really like this, but it is a sanity check on the client
 652          * MD request.  However, if the client doesn't know how much space
 653          * to reserve for the MD, it shouldn't be bad to have too much space.
 654          */
 655         if (lmm_size > mds->mds_max_mdsize) {
 656                 CWARN("Reading MD for inode %lu of %d bytes > max %d\n",
 657                        inode->i_ino, lmm_size, mds->mds_max_mdsize);
 658                 // RETURN(-EINVAL);
 659         }
 660
 661         rc = mds_get_md(obd, inode, lmm, &lmm_size, lock);
 662         if (rc > 0) {
 663                 if (S_ISDIR(inode->i_mode))
 664                         body->valid |= OBD_MD_FLDIREA;
 665                 else
 666                         body->valid |= OBD_MD_FLEASIZE;
 667                 body->eadatasize = lmm_size;
 668                 rc = 0;
 669         }
 670
 671         RETURN(rc);
 672 }
 673
 674 static int mds_getattr_internal(struct obd_device *obd, struct dentry *dentry,
 675                                 struct ptlrpc_request *req,
 676                                 struct mds_body *reqbody, int reply_off)
 677 {
 678         struct mds_body *body;
 679         struct inode *inode = dentry->d_inode;
 680         int rc = 0;
 681         ENTRY;
 682
 683         if (inode == NULL && !(dentry->d_flags & DCACHE_CROSS_REF))
 684                 RETURN(-ENOENT);
 685
 686         body = lustre_msg_buf(req->rq_repmsg, reply_off, sizeof(*body));
 687         LASSERT(body != NULL);                 /* caller prepped reply */
 688
 689         if (dentry->d_flags & DCACHE_CROSS_REF) {
 690                 CDEBUG(D_OTHER, "cross reference: %lu/%lu/%lu\n",
 691                        (unsigned long) dentry->d_mdsnum,
 692                        (unsigned long) dentry->d_inum,
 693                        (unsigned long) dentry->d_generation);
 694                 body->valid |= OBD_MD_FLID | OBD_MD_MDS;
 695                 body->fid1.id = dentry->d_inum;
 696                 body->fid1.mds = dentry->d_mdsnum;
 697                 body->fid1.generation = dentry->d_generation;
 698                 RETURN(0);
 699         }
 700         mds_pack_inode2fid(obd, &body->fid1, inode);
 701         mds_pack_inode2body(obd, body, inode);
 702
 703         if ((S_ISREG(inode->i_mode) && (reqbody->valid & OBD_MD_FLEASIZE)) ||
 704             (S_ISDIR(inode->i_mode) && (reqbody->valid & OBD_MD_FLDIREA))) {
 705                 rc = mds_pack_md(obd, req->rq_repmsg, reply_off + 1, body,
 706                                  inode, 1);
 707
 708                 /* If we have LOV EA data, the OST holds size, atime, mtime */
 709                 if (!(body->valid & OBD_MD_FLEASIZE) &&
 710                     !(body->valid & OBD_MD_FLDIREA))
 711                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
 712                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
 713         } else if (S_ISLNK(inode->i_mode) &&
 714                    (reqbody->valid & OBD_MD_LINKNAME) != 0) {
 715                 char *symname = lustre_msg_buf(req->rq_repmsg, reply_off + 1,0);
 716                 int len;
 717
 718                 LASSERT (symname != NULL);       /* caller prepped reply */
 719                 len = req->rq_repmsg->buflens[reply_off + 1];
 720
 721                 rc = inode->i_op->readlink(dentry, symname, len);
 722                 if (rc < 0) {
 723                         CERROR("readlink failed: %d\n", rc);
 724                 } else if (rc != len - 1) {
 725                         CERROR ("Unexpected readlink rc %d: expecting %d\n",
 726                                 rc, len - 1);
 727                         rc = -EINVAL;
 728                 } else {
 729                         CDEBUG(D_INODE, "read symlink dest %s\n", symname);
 730                         body->valid |= OBD_MD_LINKNAME;
 731                         body->eadatasize = rc + 1;
 732                         symname[rc] = 0;        /* NULL terminate */
 733                         rc = 0;
 734                 }
 735         }
 736
 737         RETURN(rc);
 738 }
 739
 740 static int mds_getattr_pack_msg_cf(struct ptlrpc_request *req,
 741                                         struct dentry *dentry,
 742                                         int offset)
 743 {
 744         int rc = 0, size[1] = {sizeof(struct mds_body)};
 745         ENTRY;
 746
 747         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK)) {
 748                 CERROR("failed MDS_GETATTR_PACK test\n");
 749                 req->rq_status = -ENOMEM;
 750                 GOTO(out, rc = -ENOMEM);
 751         }
 752
 753         rc = lustre_pack_reply(req, 1, size, NULL);
 754         if (rc) {
 755                 CERROR("out of memory\n");
 756                 GOTO(out, req->rq_status = rc);
 757         }
 758
 759         EXIT;
 760  out:
 761         return(rc);
 762 }
 763
 764 static int mds_getattr_pack_msg(struct ptlrpc_request *req, struct inode *inode,
 765                                 int offset)
 766 {
 767         struct mds_obd *mds = mds_req2mds(req);
 768         struct mds_body *body;
 769         int rc = 0, size[2] = {sizeof(*body)}, bufcount = 1;
 770         ENTRY;
 771
 772         body = lustre_msg_buf(req->rq_reqmsg, offset, sizeof (*body));
 773         LASSERT(body != NULL);                 /* checked by caller */
 774         LASSERT_REQSWABBED(req, offset);       /* swabbed by caller */
 775
 776         if ((S_ISREG(inode->i_mode) && (body->valid & OBD_MD_FLEASIZE)) ||
 777             (S_ISDIR(inode->i_mode) && (body->valid & OBD_MD_FLDIREA))) {
 778                 int rc;
 779                 down(&inode->i_sem);
 780                 rc = fsfilt_get_md(req->rq_export->exp_obd, inode, NULL, 0);
 781                 up(&inode->i_sem);
 782                 CDEBUG(D_INODE, "got %d bytes MD data for inode %lu\n",
 783                        rc, inode->i_ino);
 784                 if (rc < 0) {
 785                         if (rc != -ENODATA)
 786                                 CERROR("error getting inode %lu MD: rc = %d\n",
 787                                        inode->i_ino, rc);
 788                         size[bufcount] = 0;
 789                 } else if (rc > mds->mds_max_mdsize) {
 790                         size[bufcount] = 0;
 791                         CERROR("MD size %d larger than maximum possible %u\n",
 792                                rc, mds->mds_max_mdsize);
 793                 } else {
 794                         size[bufcount] = rc;
 795                 }
 796                 bufcount++;
 797         } else if (S_ISLNK(inode->i_mode) && (body->valid & OBD_MD_LINKNAME)) {
 798                 if (inode->i_size + 1 != body->eadatasize)
 799                         CERROR("symlink size: %Lu, reply space: %d\n",
 800                                inode->i_size + 1, body->eadatasize);
 801                 size[bufcount] = min_t(int, inode->i_size+1, body->eadatasize);
 802                 bufcount++;
 803                 CDEBUG(D_INODE, "symlink size: %Lu, reply space: %d\n",
 804                        inode->i_size + 1, body->eadatasize);
 805         }
 806
 807         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK)) {
 808                 CERROR("failed MDS_GETATTR_PACK test\n");
 809                 req->rq_status = -ENOMEM;
 810                 GOTO(out, rc = -ENOMEM);
 811         }
 812
 813         rc = lustre_pack_reply(req, bufcount, size, NULL);
 814         if (rc) {
 815                 CERROR("out of memory\n");
 816                 GOTO(out, req->rq_status = rc);
 817         }
 818
 819         EXIT;
 820  out:
 821         return(rc);
 822 }
 823
 824 int mds_check_mds_num(struct obd_device *obd, struct inode* inode,
 825                       char *name, int namelen)
 826 {
 827         struct mea *mea = NULL;
 828         int mea_size, rc = 0;
 829         ENTRY;
 830
 831         rc = mds_get_lmv_attr(obd, inode, &mea, &mea_size);
 832         if (rc)
 833                 RETURN(rc);
 834         if (mea != NULL) {
 835                 /* dir is already splitted, check if requested filename
 836                  * should live at this MDS or at another one */
 837                 int i;
 838                 i = mea_name2idx(mea, name, namelen - 1);
 839                 if (mea->mea_master != mea->mea_fids[i].mds) {
 840                         CDEBUG(D_OTHER,
 841                                "inapropriate MDS(%d) for %s. should be %d(%d)\n",
 842                                mea->mea_master, name, mea->mea_fids[i].mds, i);
 843                         rc = -ERESTART;
 844                 }
 845         }
 846
 847         if (mea)
 848                 OBD_FREE(mea, mea_size);
 849         RETURN(rc);
 850 }
 851
 852 static int mds_getattr_name(int offset, struct ptlrpc_request *req,
 853                             struct lustre_handle *child_lockh, int child_part)
 854 {
 855         struct obd_device *obd = req->rq_export->exp_obd;
 856         struct ldlm_reply *rep = NULL;
 857         struct lvfs_run_ctxt saved;
 858         struct mds_body *body;
 859         struct dentry *dparent = NULL, *dchild = NULL;
 860         struct lvfs_ucred uc;
 861         struct lustre_handle parent_lockh[2];
 862         int namesize, update_mode;
 863         int rc = 0, cleanup_phase = 0, resent_req = 0;
 864         struct clonefs_info *clone_info = NULL;
 865         char *name;
 866         ENTRY;
 867
 868         LASSERT(!strcmp(obd->obd_type->typ_name, LUSTRE_MDS_NAME));
 869
 870         /* Swab now, before anyone looks inside the request */
 871
 872         body = lustre_swab_reqbuf(req, offset, sizeof(*body),
 873                                   lustre_swab_mds_body);
 874         if (body == NULL) {
 875                 CERROR("Can't swab mds_body\n");
 876                 GOTO(cleanup, rc = -EFAULT);
 877         }
 878
 879         LASSERT_REQSWAB(req, offset + 1);
 880         name = lustre_msg_string(req->rq_reqmsg, offset + 1, 0);
 881         if (name == NULL) {
 882                 CERROR("Can't unpack name\n");
 883                 GOTO(cleanup, rc = -EFAULT);
 884         }
 885 #if CONFIG_SNAPFS
 886         clone_info = lustre_swab_reqbuf(req, offset + 2, sizeof(*clone_info),
 887                                         lustre_swab_clonefs_info);
 888         if (clone_info) {
 889                 CDEBUG(D_INFO,"getattr name %s clone_info index %d \n", name,
 890                        clone_info->clone_index);
 891         }
 892 #endif
 893         namesize = req->rq_reqmsg->buflens[offset + 1];
 894
 895         LASSERT (offset == 0 || offset == 2);
 896         /* if requests were at offset 2, the getattr reply goes back at 1 */
 897         if (offset) {
 898                 rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*rep));
 899                 offset = 1;
 900         }
 901
 902         uc.luc_fsuid = body->fsuid;
 903         uc.luc_fsgid = body->fsgid;
 904         uc.luc_cap = body->capability;
 905         uc.luc_suppgid1 = body->suppgid;
 906         uc.luc_suppgid2 = -1;
 907         push_ctxt(&saved, &obd->obd_lvfs_ctxt, &uc);
 908         cleanup_phase = 1; /* kernel context */
 909         intent_set_disposition(rep, DISP_LOOKUP_EXECD);
 910
 911         LASSERT(namesize > 0);
 912         if (namesize == 1) {
 913                 /* we have no dentry here, drop LOOKUP bit */
 914                 child_part &= ~MDS_INODELOCK_LOOKUP;
 915                 CDEBUG(D_OTHER, "%s: request to retrieve attrs for %lu/%lu\n",
 916                        obd->obd_name, (unsigned long) body->fid1.id,
 917                        (unsigned long) body->fid1.generation);
 918                 dchild = mds_fid2locked_dentry(obd, &body->fid1, NULL, LCK_PR,
 919                                                parent_lockh, &update_mode,
 920                                                NULL, 0, child_part);
 921                 if (IS_ERR(dchild)) {
 922                         CERROR("can't find inode: %d\n", (int) PTR_ERR(dchild));
 923                         GOTO(cleanup, rc = PTR_ERR(dchild));
 924                 }
 925                 memcpy(child_lockh, parent_lockh, sizeof(parent_lockh[0]));
 926 #ifdef S_PDIROPS
 927                 if (parent_lockh[1].cookie)
 928                         ldlm_lock_decref(parent_lockh + 1, update_mode);
 929 #endif
 930                 cleanup_phase = 2;
 931                 goto fill_inode;
 932         }
 933
 934 #if HAVE_LOOKUP_RAW
 935         /* FIXME: handle raw lookup */
 936         if (body->valid == OBD_MD_FLID) {
 937                 struct mds_obd *mds = &obd->u.mds;
 938                 struct mds_body *mds_reply;
 939                 int size = sizeof(*mds_reply);
 940                 struct inode *dir;
 941                 ino_t inum;
 942                 dparent = mds_fid2dentry(mds, &body->fid1, NULL);
 943                 if (IS_ERR(dparent)) {
 944                         rc = PTR_ERR(dparent);
 945                         GOTO(cleanup, rc);
 946                 }
 947                 // The user requested ONLY the inode number, so do a raw lookup
 948                 rc = lustre_pack_reply(req, 1, &size, NULL);
 949                 if (rc) {
 950                         CERROR("out of memory\n");
 951                         l_dput(dparent);
 952                         GOTO(cleanup, rc);
 953                 }
 954                 dir  = dparent->d_inode;
 955                 LASSERT(dir->i_op->lookup_raw != NULL);
 956                 rc = dir->i_op->lookup_raw(dir, name, namesize - 1, &inum);
 957                 l_dput(dparent);
 958                 mds_reply = lustre_msg_buf(req->rq_repmsg, offset,
 959                                            sizeof(*mds_reply));
 960                 mds_reply->fid1.id = inum;
 961                 mds_reply->valid = OBD_MD_FLID;
 962                 GOTO(cleanup, rc);
 963         }
 964 #endif
 965
 966         if (child_lockh->cookie != 0) {
 967                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
 968                 resent_req = 1;
 969         }
 970
 971         if (resent_req == 0) {
 972                 rc = mds_get_parent_child_locked(obd, &obd->u.mds, &body->fid1,
 973                                                  parent_lockh, &dparent,
 974                                                  LCK_PR, MDS_INODELOCK_LOOKUP,
 975                                                  &update_mode, name, namesize,
 976                                                  child_lockh, &dchild, LCK_PR,
 977                                                  child_part, clone_info);
 978                 if (rc)
 979                         GOTO(cleanup, rc);
 980
 981                 /* let's make sure this name should leave on this mds node */
 982                 rc = mds_check_mds_num(obd, dparent->d_inode, name, namesize);
 983                 if (rc)
 984                         GOTO(cleanup, rc);
 985         } else {
 986                 struct ldlm_lock *granted_lock;
 987                 struct ll_fid child_fid;
 988                 struct ldlm_resource *res;
 989                 DEBUG_REQ(D_DLMTRACE, req, "resent, not enqueuing new locks");
 990                 granted_lock = ldlm_handle2lock(child_lockh);
 991                 LASSERT(granted_lock);
 992
 993                 res = granted_lock->l_resource;
 994                 child_fid.id = res->lr_name.name[0];
 995                 child_fid.generation = res->lr_name.name[1];
 996                 dchild = mds_fid2dentry(&obd->u.mds, &child_fid, NULL);
 997                 LASSERT(dchild);
 998                 LDLM_LOCK_PUT(granted_lock);
 999         }
1000
1001         cleanup_phase = 2; /* dchild, dparent, locks */
1002
1003 fill_inode:
1004
1005         if (!DENTRY_VALID(dchild)) {
1006                 intent_set_disposition(rep, DISP_LOOKUP_NEG);
1007                 /* in the intent case, the policy clears this error:
1008                    the disposition is enough */
1009                 rc = -ENOENT;
1010                 GOTO(cleanup, rc);
1011         } else {
1012                 intent_set_disposition(rep, DISP_LOOKUP_POS);
1013         }
1014
1015         if (req->rq_repmsg == NULL) {
1016                 if (dchild->d_flags & DCACHE_CROSS_REF)
1017                         rc = mds_getattr_pack_msg_cf(req, dchild, offset);
1018                 else
1019                         rc = mds_getattr_pack_msg(req, dchild->d_inode, offset);
1020                 if (rc != 0) {
1021                         CERROR ("mds_getattr_pack_msg: %d\n", rc);
1022                         GOTO (cleanup, rc);
1023                 }
1024         }
1025
1026         rc = mds_getattr_internal(obd, dchild, req, body, offset);
1027         GOTO(cleanup, rc); /* returns the lock to the client */
1028
1029  cleanup:
1030         switch (cleanup_phase) {
1031         case 2:
1032                 if (resent_req == 0) {
1033                         if (rc && DENTRY_VALID(dchild))
1034                                 ldlm_lock_decref(child_lockh, LCK_PR);
1035                         if (dparent) {
1036                                 ldlm_lock_decref(parent_lockh, LCK_PR);
1037 #ifdef S_PDIROPS
1038                                 if (parent_lockh[1].cookie != 0)
1039                                         ldlm_lock_decref(parent_lockh + 1,
1040                                                          update_mode);
1041 #endif
1042                         }
1043                         if (dparent)
1044                                 l_dput(dparent);
1045                 }
1046                 l_dput(dchild);
1047         case 1:
1048                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &uc);
1049         default: ;
1050         }
1051         return rc;
1052 }
1053
1054 static int mds_getattr(int offset, struct ptlrpc_request *req)
1055 {
1056         struct mds_obd *mds = mds_req2mds(req);
1057         struct obd_device *obd = req->rq_export->exp_obd;
1058         struct lvfs_run_ctxt saved;
1059         struct dentry *de;
1060         struct mds_body *body;
1061         struct lvfs_ucred uc;
1062         int rc = 0;
1063         ENTRY;
1064
1065         body = lustre_swab_reqbuf (req, offset, sizeof (*body),
1066                                    lustre_swab_mds_body);
1067         if (body == NULL) {
1068                 CERROR ("Can't unpack body\n");
1069                 RETURN (-EFAULT);
1070         }
1071
1072         uc.luc_fsuid = body->fsuid;
1073         uc.luc_fsgid = body->fsgid;
1074         uc.luc_cap = body->capability;
1075         push_ctxt(&saved, &obd->obd_lvfs_ctxt, &uc);
1076         de = mds_fid2dentry(mds, &body->fid1, NULL);
1077         if (IS_ERR(de)) {
1078                 rc = req->rq_status = -ENOENT;
1079                 GOTO(out_pop, PTR_ERR(de));
1080         }
1081
1082         rc = mds_getattr_pack_msg(req, de->d_inode, offset);
1083         if (rc != 0) {
1084                 CERROR ("mds_getattr_pack_msg: %d\n", rc);
1085                 GOTO (out_pop, rc);
1086         }
1087
1088         req->rq_status = mds_getattr_internal(obd, de, req, body, 0);
1089
1090         l_dput(de);
1091         GOTO(out_pop, rc);
1092 out_pop:
1093         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &uc);
1094         return rc;
1095 }
1096
1097
1098 static int mds_obd_statfs(struct obd_device *obd, struct obd_statfs *osfs,
1099                           unsigned long max_age)
1100 {
1101         int rc;
1102
1103         spin_lock(&obd->obd_osfs_lock);
1104         rc = fsfilt_statfs(obd, obd->u.mds.mds_sb, max_age);
1105         if (rc == 0)
1106                 memcpy(osfs, &obd->obd_osfs, sizeof(*osfs));
1107         spin_unlock(&obd->obd_osfs_lock);
1108
1109         return rc;
1110 }
1111
1112 static int mds_statfs(struct ptlrpc_request *req)
1113 {
1114         struct obd_device *obd = req->rq_export->exp_obd;
1115         int rc, size = sizeof(struct obd_statfs);
1116         ENTRY;
1117
1118         rc = lustre_pack_reply(req, 1, &size, NULL);
1119         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK)) {
1120                 CERROR("mds: statfs lustre_pack_reply failed: rc = %d\n", rc);
1121                 GOTO(out, rc);
1122         }
1123
1124         /* We call this so that we can cache a bit - 1 jiffie worth */
1125         rc = mds_obd_statfs(obd, lustre_msg_buf(req->rq_repmsg, 0, size),
1126                             jiffies - HZ);
1127         if (rc) {
1128                 CERROR("mds_obd_statfs failed: rc %d\n", rc);
1129                 GOTO(out, rc);
1130         }
1131
1132         EXIT;
1133 out:
1134         req->rq_status = rc;
1135         return 0;
1136 }
1137
1138 static int mds_sync(struct ptlrpc_request *req)
1139 {
1140         struct obd_device *obd = req->rq_export->exp_obd;
1141         struct mds_obd *mds = &obd->u.mds;
1142         struct mds_body *body;
1143         int rc, size = sizeof(*body);
1144         ENTRY;
1145
1146         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
1147         if (body == NULL)
1148                 GOTO(out, rc = -EPROTO);
1149
1150         rc = lustre_pack_reply(req, 1, &size, NULL);
1151         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK)) {
1152                 CERROR("fsync lustre_pack_reply failed: rc = %d\n", rc);
1153                 GOTO(out, rc);
1154         }
1155
1156         if (body->fid1.id == 0) {
1157                 /* a fid of zero is taken to mean "sync whole filesystem" */
1158                 rc = fsfilt_sync(obd, mds->mds_sb);
1159                 if (rc)
1160                         GOTO(out, rc);
1161         } else {
1162                 /* just any file to grab fsync method - "file" arg unused */
1163                 struct file *file = mds->mds_rcvd_filp;
1164                 struct dentry *de;
1165
1166                 de = mds_fid2dentry(mds, &body->fid1, NULL);
1167                 if (IS_ERR(de))
1168                         GOTO(out, rc = PTR_ERR(de));
1169
1170                 rc = file->f_op->fsync(NULL, de, 1);
1171                 l_dput(de);
1172                 if (rc)
1173                         GOTO(out, rc);
1174
1175                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
1176                 mds_pack_inode2fid(obd, &body->fid1, de->d_inode);
1177                 mds_pack_inode2body(obd, body, de->d_inode);
1178         }
1179 out:
1180         req->rq_status = rc;
1181         return 0;
1182 }
1183
1184 /* mds_readpage does not take a DLM lock on the inode, because the client must
1185  * already have a PR lock.
1186  *
1187  * If we were to take another one here, a deadlock will result, if another
1188  * thread is already waiting for a PW lock. */
1189 static int mds_readpage(struct ptlrpc_request *req)
1190 {
1191         struct obd_device *obd = req->rq_export->exp_obd;
1192         struct vfsmount *mnt;
1193         struct dentry *de;
1194         struct file *file;
1195         struct mds_body *body, *repbody;
1196         struct lvfs_run_ctxt saved;
1197         int rc, size = sizeof(*repbody);
1198         struct lvfs_ucred uc;
1199         ENTRY;
1200
1201         rc = lustre_pack_reply(req, 1, &size, NULL);
1202         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK)) {
1203                 CERROR("mds: out of memory\n");
1204                 GOTO(out, rc = -ENOMEM);
1205         }
1206
1207         body = lustre_swab_reqbuf(req, 0, sizeof(*body), lustre_swab_mds_body);
1208         if (body == NULL)
1209                 GOTO (out, rc = -EFAULT);
1210
1211         uc.luc_fsuid = body->fsuid;
1212         uc.luc_fsgid = body->fsgid;
1213         uc.luc_cap = body->capability;
1214         push_ctxt(&saved, &obd->obd_lvfs_ctxt, &uc);
1215         de = mds_fid2dentry(&obd->u.mds, &body->fid1, &mnt);
1216         if (IS_ERR(de))
1217                 GOTO(out_pop, rc = PTR_ERR(de));
1218
1219         CDEBUG(D_INODE, "ino %lu\n", de->d_inode->i_ino);
1220
1221         file = dentry_open(de, mnt, O_RDONLY | O_LARGEFILE);
1222         /* note: in case of an error, dentry_open puts dentry */
1223         if (IS_ERR(file))
1224                 GOTO(out_pop, rc = PTR_ERR(file));
1225
1226         /* body->size is actually the offset -eeb */
1227         if ((body->size & (de->d_inode->i_blksize - 1)) != 0) {
1228                 CERROR("offset "LPU64" not on a block boundary of %lu\n",
1229                        body->size, de->d_inode->i_blksize);
1230                 GOTO(out_file, rc = -EFAULT);
1231         }
1232
1233         /* body->nlink is actually the #bytes to read -eeb */
1234         if (body->nlink & (de->d_inode->i_blksize - 1)) {
1235                 CERROR("size %u is not multiple of blocksize %lu\n",
1236                        body->nlink, de->d_inode->i_blksize);
1237                 GOTO(out_file, rc = -EFAULT);
1238         }
1239
1240         repbody = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*repbody));
1241         repbody->size = file->f_dentry->d_inode->i_size;
1242         repbody->valid = OBD_MD_FLSIZE;
1243
1244         /* to make this asynchronous make sure that the handling function
1245            doesn't send a reply when this function completes. Instead a
1246            callback function would send the reply */
1247         /* body->size is actually the offset -eeb */
1248         rc = mds_sendpage(req, file, body->size, body->nlink);
1249
1250 out_file:
1251         filp_close(file, 0);
1252 out_pop:
1253         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &uc);
1254 out:
1255         req->rq_status = rc;
1256         RETURN(0);
1257 }
1258
1259 int mds_reint(struct ptlrpc_request *req, int offset,
1260               struct lustre_handle *lockh)
1261 {
1262         struct mds_update_record *rec; /* 116 bytes on the stack?  no sir! */
1263         int rc;
1264         ENTRY;
1265
1266         OBD_ALLOC(rec, sizeof(*rec));
1267         if (rec == NULL)
1268                 RETURN(-ENOMEM);
1269
1270         rc = mds_update_unpack(req, offset, rec);
1271         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNPACK)) {
1272                 CERROR("invalid record\n");
1273                 GOTO(out, req->rq_status = -EINVAL);
1274         }
1275         /* rc will be used to interrupt a for loop over multiple records */
1276         rc = mds_reint_rec(rec, offset, req, lockh);
1277  out:
1278         OBD_FREE(rec, sizeof(*rec));
1279         RETURN(rc);
1280 }
1281
1282 static int mds_filter_recovery_request(struct ptlrpc_request *req,
1283                                        struct obd_device *obd, int *process)
1284 {
1285         switch (req->rq_reqmsg->opc) {
1286         case MDS_CONNECT: /* This will never get here, but for completeness. */
1287         case OST_CONNECT: /* This will never get here, but for completeness. */
1288         case MDS_DISCONNECT:
1289         case OST_DISCONNECT:
1290                *process = 1;
1291                RETURN(0);
1292
1293         case MDS_CLOSE:
1294         case MDS_SYNC: /* used in unmounting */
1295         case OBD_PING:
1296         case MDS_REINT:
1297         case LDLM_ENQUEUE:
1298         case OST_CREATE:
1299                 *process = target_queue_recovery_request(req, obd);
1300                 RETURN(0);
1301
1302         default:
1303                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
1304                 *process = 0;
1305                 /* XXX what should we set rq_status to here? */
1306                 req->rq_status = -EAGAIN;
1307                 RETURN(ptlrpc_error(req));
1308         }
1309 }
1310
1311 static char *reint_names[] = {
1312         [REINT_SETATTR] "setattr",
1313         [REINT_CREATE]  "create",
1314         [REINT_LINK]    "link",
1315         [REINT_UNLINK]  "unlink",
1316         [REINT_RENAME]  "rename",
1317         [REINT_OPEN]    "open",
1318 };
1319
1320 #define FILTER_VALID_FLAGS (OBD_MD_FLTYPE | OBD_MD_FLMODE | OBD_MD_FLGENER  |\
1321                             OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLBLKSZ|\
1322                             OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME|\
1323                             OBD_MD_FLID)
1324
1325 static void reconstruct_create(struct ptlrpc_request *req)
1326 {
1327         struct mds_export_data *med = &req->rq_export->exp_mds_data;
1328         struct mds_client_data *mcd = med->med_mcd;
1329         struct ost_body *body;
1330
1331         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
1332
1333         /* copy rc, transno and disp; steal locks */
1334         mds_req_from_mcd(req, mcd);
1335         CERROR("reconstruct reply for x"LPU64"\n", req->rq_xid);
1336 }
1337
1338 static int mdt_obj_create(struct ptlrpc_request *req)
1339 {
1340         struct obd_device *obd = req->rq_export->exp_obd;
1341         struct mds_obd *mds = &obd->u.mds;
1342         struct ost_body *body, *repbody;
1343         char fidname[LL_FID_NAMELEN];
1344         struct inode *parent_inode;
1345         struct lvfs_run_ctxt saved;
1346         struct dentry *new = NULL;
1347         struct dentry_params dp;
1348         int mealen, flags = 0, rc, size = sizeof(*repbody), cleanup_phase = 0;
1349         struct lvfs_ucred uc;
1350         struct mea *mea;
1351         void *handle = NULL;
1352         ENTRY;
1353
1354         DEBUG_REQ(D_HA, req, "create remote object");
1355
1356         parent_inode = mds->mds_unnamed_dir->d_inode;
1357
1358         body = lustre_swab_reqbuf(req, 0, sizeof(*body), lustre_swab_ost_body);
1359         if (body == NULL)
1360                 RETURN(-EFAULT);
1361
1362         rc = lustre_pack_reply(req, 1, &size, NULL);
1363         if (rc)
1364                 RETURN(rc);
1365
1366         MDS_CHECK_RESENT(req, reconstruct_create(req));
1367
1368         uc.luc_fsuid = body->oa.o_uid;
1369         uc.luc_fsgid = body->oa.o_gid;
1370
1371         push_ctxt(&saved, &obd->obd_lvfs_ctxt, &uc);
1372
1373         repbody = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*repbody));
1374
1375         if (body->oa.o_flags & OBD_FL_RECREATE_OBJS) {
1376                 /* this is re-create request from MDS holding directory name.
1377                  * we have to lookup given ino/generation first. if it exists
1378                  * (good case) then there is nothing to do. if it does not
1379                  * then we have to recreate it */
1380                 struct ll_fid fid;
1381                 fid.id = body->oa.o_id;
1382                 fid.generation = body->oa.o_generation;
1383                 new = mds_fid2dentry(mds, &fid, NULL);
1384                 if (!IS_ERR(new) && new->d_inode) {
1385                         CDEBUG(D_HA, "mkdir() repairing is on its way: %lu/%lu\n",
1386                                (unsigned long) fid.id,
1387                                (unsigned long) fid.generation);
1388                         obdo_from_inode(&repbody->oa, new->d_inode,
1389                                         FILTER_VALID_FLAGS);
1390                         repbody->oa.o_id = new->d_inode->i_ino;
1391                         repbody->oa.o_generation = new->d_inode->i_generation;
1392                         repbody->oa.o_valid |= OBD_MD_FLID | OBD_MD_FLGENER;
1393                         cleanup_phase = 1;
1394                         GOTO(cleanup, rc = 0);
1395                 }
1396                 CWARN("hmm. for some reason dir %lu/%lu (or reply) got lost\n",
1397                       (unsigned long) fid.id, (unsigned long) fid.generation);
1398                 LASSERT(new->d_inode == NULL ||
1399                         new->d_inode->i_generation != fid.generation);
1400                 l_dput(new);
1401         }
1402
1403         down(&parent_inode->i_sem);
1404         handle = fsfilt_start(obd, parent_inode, FSFILT_OP_MKDIR, NULL);
1405         if (IS_ERR(handle)) {
1406                 up(&parent_inode->i_sem);
1407                 GOTO(cleanup, rc = PTR_ERR(handle));
1408         }
1409         cleanup_phase = 1; /* transaction */
1410
1411 repeat:
1412         rc = sprintf(fidname, "%u.%u", ll_insecure_random_int(), current->pid);
1413         new = lookup_one_len(fidname, mds->mds_unnamed_dir, rc);
1414         if (IS_ERR(new)) {
1415                 CERROR("%s: can't lookup new inode (%s) for mkdir: %d\n",
1416                        obd->obd_name, fidname, (int) PTR_ERR(new));
1417                 fsfilt_commit(obd, mds->mds_sb, new->d_inode, handle, 0);
1418                 up(&parent_inode->i_sem);
1419                 RETURN(PTR_ERR(new));
1420         } else if (new->d_inode) {
1421                 CERROR("%s: name exists. repeat\n", obd->obd_name);
1422                 goto repeat;
1423         }
1424
1425         new->d_fsdata = (void *) &dp;
1426         dp.p_inum = 0;
1427         dp.p_ptr = req;
1428
1429         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1430                 DEBUG_REQ(D_HA, req, "replay create obj %lu/%lu",
1431                           (unsigned long) body->oa.o_id,
1432                           (unsigned long) body->oa.o_generation);
1433                 dp.p_inum = body->oa.o_id;
1434                 dp.p_generation = body->oa.o_generation;
1435         }
1436         rc = vfs_mkdir(parent_inode, new, body->oa.o_mode);
1437         if (rc == 0) {
1438                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1439                         LASSERTF(body->oa.o_id == new->d_inode->i_ino,
1440                                  "BUG 3550: failed to recreate obj "
1441                                  LPU64" -> %lu\n",
1442                                  body->oa.o_id, new->d_inode->i_ino);
1443                         LASSERTF(body->oa.o_generation ==
1444                                  new->d_inode->i_generation,
1445                                  "BUG 3550: failed to recreate obj/gen "
1446                                  LPU64"/%u -> %lu/%u\n",
1447                                  body->oa.o_id, body->oa.o_generation,
1448                                  new->d_inode->i_ino,
1449                                  new->d_inode->i_generation);
1450                 }
1451
1452                 obdo_from_inode(&repbody->oa, new->d_inode, FILTER_VALID_FLAGS);
1453                 repbody->oa.o_id = new->d_inode->i_ino;
1454                 repbody->oa.o_generation = new->d_inode->i_generation;
1455                 repbody->oa.o_valid |= OBD_MD_FLID | OBD_MD_FLGENER;
1456
1457                 rc = fsfilt_del_dir_entry(obd, new);
1458                 up(&parent_inode->i_sem);
1459
1460                 if (rc) {
1461                         CERROR("can't remove name for object: %d\n", rc);
1462                         GOTO(cleanup, rc);
1463                 }
1464
1465                 cleanup_phase = 2; /* created directory object */
1466
1467                 CDEBUG(D_OTHER, "created dirobj: %lu/%lu mode %o\n",
1468                                 (unsigned long) new->d_inode->i_ino,
1469                                 (unsigned long) new->d_inode->i_generation,
1470                                 (unsigned) new->d_inode->i_mode);
1471         } else {
1472                 up(&parent_inode->i_sem);
1473                 CERROR("%s: can't create dirobj: %d\n", obd->obd_name, rc);
1474                 GOTO(cleanup, rc);
1475         }
1476
1477         if (body->oa.o_valid & OBD_MD_FLID) {
1478                 /* this is new object for splitted dir. we have to
1479                  * prevent recursive splitting on it -bzzz */
1480                 mealen = obd_size_diskmd(mds->mds_lmv_exp, NULL);
1481                 OBD_ALLOC(mea, mealen);
1482                 if (mea == NULL)
1483                         GOTO(cleanup, rc = -ENOMEM);
1484                 mea->mea_magic = MEA_MAGIC_ALL_CHARS;
1485                 mea->mea_master = 0;
1486                 mea->mea_count = 0;
1487                 down(&new->d_inode->i_sem);
1488                 rc = fsfilt_set_md(obd, new->d_inode, handle, mea, mealen);
1489                 up(&new->d_inode->i_sem);
1490                 OBD_FREE(mea, mealen);
1491                 CDEBUG(D_OTHER, "%s: mark non-splittable %lu/%u - %d\n",
1492                        obd->obd_name, new->d_inode->i_ino,
1493                        new->d_inode->i_generation, flags);
1494         } else if (body->oa.o_easize) {
1495                 /* we pass LCK_EX to split routine to signal that we have
1496                  * exclusive access to the directory. simple because nobody
1497                  * knows it already exists -bzzz */
1498                 mds_try_to_split_dir(obd, new, NULL, body->oa.o_easize, LCK_EX);
1499         }
1500
1501 cleanup:
1502         switch (cleanup_phase) {
1503         case 2: /* object has been created, but we'll may want to replay it later */
1504                 if (rc == 0)
1505                         ptlrpc_require_repack(req);
1506         case 1: /* transaction */
1507                 rc = mds_finish_transno(mds, parent_inode, handle, req, rc, 0);
1508         }
1509
1510         l_dput(new);
1511         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &uc);
1512         RETURN(rc);
1513 }
1514
1515 static int mdt_get_info(struct ptlrpc_request *req)
1516 {
1517         char *key;
1518         struct obd_export *exp = req->rq_export;
1519         int keylen, rc = 0, size = sizeof(obd_id);
1520         obd_id *reply;
1521         ENTRY;
1522
1523         key = lustre_msg_buf(req->rq_reqmsg, 0, 1);
1524         if (key == NULL) {
1525                 DEBUG_REQ(D_HA, req, "no get_info key");
1526                 RETURN(-EFAULT);
1527         }
1528         keylen = req->rq_reqmsg->buflens[0];
1529
1530         if (keylen < strlen("mdsize") || memcmp(key, "mdsize", 6) != 0)
1531                 RETURN(-EPROTO);
1532
1533         rc = lustre_pack_reply(req, 1, &size, NULL);
1534         if (rc)
1535                 RETURN(rc);
1536
1537         reply = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*reply));
1538         rc = obd_get_info(exp, keylen, key, &size, reply);
1539         req->rq_repmsg->status = 0;
1540         RETURN(rc);
1541 }
1542
1543 static int mds_set_info(struct obd_export *exp, __u32 keylen,
1544                         void *key, __u32 vallen, void *val)
1545 {
1546         struct obd_device *obd;
1547         struct mds_obd *mds;
1548         int    rc = 0;
1549         ENTRY;
1550
1551         obd = class_exp2obd(exp);
1552         if (obd == NULL) {
1553                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1554                        exp->exp_handle.h_cookie);
1555                 RETURN(-EINVAL);
1556         }
1557
1558 #define KEY_IS(str) \
1559         (keylen == strlen(str) && memcmp(key, str, keylen) == 0)
1560
1561         mds = &obd->u.mds;
1562         if (KEY_IS("mds_num")) {
1563                 int valsize;
1564                 __u32 group;
1565                 CDEBUG(D_IOCTL, "set mds num %d\n", *(int*)val);
1566                 mds->mds_num = *(int*)val;
1567                 group = FILTER_GROUP_FIRST_MDS + mds->mds_num;
1568                 valsize = sizeof(group);
1569                 /*mds number has been changed, so the corresponding obdfilter exp
1570                  *need to be changed too*/
1571                 rc = obd_set_info(mds->mds_osc_exp, strlen("mds_conn"), "mds_conn",
1572                           valsize, &group);
1573                 RETURN(rc);
1574         }
1575         CDEBUG(D_IOCTL, "invalid key\n");
1576         RETURN(-EINVAL);
1577 }
1578
1579 static int mdt_set_info(struct ptlrpc_request *req)
1580 {
1581         char *key, *val;
1582         struct obd_export *exp = req->rq_export;
1583         int keylen, rc = 0, vallen;
1584         ENTRY;
1585
1586         key = lustre_msg_buf(req->rq_reqmsg, 0, 1);
1587         if (key == NULL) {
1588                 DEBUG_REQ(D_HA, req, "no set_info key");
1589                 RETURN(-EFAULT);
1590         }
1591         keylen = req->rq_reqmsg->buflens[0];
1592
1593         if (keylen == strlen("mds_num") &&
1594             memcmp(key, "mds_num", keylen) == 0) {
1595                 rc = lustre_pack_reply(req, 0, NULL, NULL);
1596                 if (rc)
1597                         RETURN(rc);
1598                 val = lustre_msg_buf(req->rq_reqmsg, 1, 0);
1599
1600                 vallen = req->rq_reqmsg->buflens[1];
1601
1602                 rc = obd_set_info(exp, keylen, key, vallen, val);
1603                 req->rq_repmsg->status = 0;
1604                 RETURN(rc);
1605         } else if (keylen == strlen("client") &&
1606                    memcmp(key, "client", keylen) == 0) {
1607                 rc = lustre_pack_reply(req, 0, NULL, NULL);
1608                 if (rc)
1609                         RETURN(rc);
1610                 rc = obd_set_info(exp, keylen, key, sizeof(obd_id), NULL);
1611                 req->rq_repmsg->status = 0;
1612                 RETURN(rc);
1613         }
1614         CDEBUG(D_IOCTL, "invalid key\n");
1615         RETURN(-EINVAL);
1616 }
1617
1618 int mds_handle(struct ptlrpc_request *req)
1619 {
1620         int should_process, fail = OBD_FAIL_MDS_ALL_REPLY_NET;
1621         int rc = 0;
1622         struct mds_obd *mds = NULL; /* quell gcc overwarning */
1623         struct obd_device *obd = NULL;
1624         ENTRY;
1625
1626         OBD_FAIL_RETURN(OBD_FAIL_MDS_ALL_REQUEST_NET | OBD_FAIL_ONCE, 0);
1627
1628         LASSERT(current->journal_info == NULL);
1629         /* XXX identical to OST */
1630         if (req->rq_reqmsg->opc != MDS_CONNECT) {
1631                 struct mds_export_data *med;
1632                 int recovering;
1633
1634                 if (req->rq_export == NULL) {
1635                         CERROR("lustre_mds: operation %d on unconnected MDS\n",
1636                                req->rq_reqmsg->opc);
1637                         req->rq_status = -ENOTCONN;
1638                         GOTO(out, rc = -ENOTCONN);
1639                 }
1640
1641                 med = &req->rq_export->exp_mds_data;
1642                 obd = req->rq_export->exp_obd;
1643                 mds = &obd->u.mds;
1644
1645                 /* sanity check: if the xid matches, the request must
1646                  * be marked as a resent or replayed */
1647                 if (req->rq_xid == med->med_mcd->mcd_last_xid)
1648                         LASSERTF(lustre_msg_get_flags(req->rq_reqmsg) &
1649                                  (MSG_RESENT | MSG_REPLAY),
1650                                  "rq_xid "LPU64" matches last_xid, "
1651                                  "expected RESENT flag\n",
1652                                  req->rq_xid);
1653                 /* else: note the opposite is not always true; a
1654                  * RESENT req after a failover will usually not match
1655                  * the last_xid, since it was likely never
1656                  * committed. A REPLAYed request will almost never
1657                  * match the last xid, however it could for a
1658                  * committed, but still retained, open. */
1659
1660                 spin_lock_bh(&obd->obd_processing_task_lock);
1661                 recovering = obd->obd_recovering;
1662                 spin_unlock_bh(&obd->obd_processing_task_lock);
1663                 if (recovering) {
1664                         rc = mds_filter_recovery_request(req, obd,
1665                                                          &should_process);
1666                         if (rc || should_process == 0) {
1667                                 RETURN(rc);
1668                         } else if (should_process < 0) {
1669                                 req->rq_status = should_process;
1670                                 rc = ptlrpc_error(req);
1671                                 RETURN(rc);
1672                         }
1673                 }
1674         }
1675
1676         switch (req->rq_reqmsg->opc) {
1677         case MDS_CONNECT:
1678                 DEBUG_REQ(D_INODE, req, "connect");
1679                 OBD_FAIL_RETURN(OBD_FAIL_MDS_CONNECT_NET, 0);
1680                 rc = target_handle_connect(req);
1681                 if (!rc)
1682                         /* Now that we have an export, set mds. */
1683                         mds = mds_req2mds(req);
1684                 break;
1685
1686         case MDS_DISCONNECT:
1687                 DEBUG_REQ(D_INODE, req, "disconnect");
1688                 OBD_FAIL_RETURN(OBD_FAIL_MDS_DISCONNECT_NET, 0);
1689                 rc = target_handle_disconnect(req);
1690                 req->rq_status = rc;            /* superfluous? */
1691                 break;
1692
1693         case MDS_GETSTATUS:
1694                 DEBUG_REQ(D_INODE, req, "getstatus");
1695                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETSTATUS_NET, 0);
1696                 rc = mds_getstatus(req);
1697                 break;
1698
1699         case MDS_GETATTR:
1700                 DEBUG_REQ(D_INODE, req, "getattr");
1701                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETATTR_NET, 0);
1702                 rc = mds_getattr(0, req);
1703                 break;
1704
1705         case MDS_GETATTR_NAME: {
1706                 struct lustre_handle lockh;
1707                 DEBUG_REQ(D_INODE, req, "getattr_name");
1708                 OBD_FAIL_RETURN(OBD_FAIL_MDS_GETATTR_NAME_NET, 0);
1709
1710                 /* If this request gets a reconstructed reply, we won't be
1711                  * acquiring any new locks in mds_getattr_name, so we don't
1712                  * want to cancel.
1713                  */
1714                 lockh.cookie = 0;
1715                 rc = mds_getattr_name(0, req, &lockh, MDS_INODELOCK_UPDATE);
1716                 /* this non-intent call (from an ioctl) is special */
1717                 req->rq_status = rc;
1718                 if (rc == 0 && lockh.cookie)
1719                         ldlm_lock_decref(&lockh, LCK_PR);
1720                 break;
1721         }
1722         case MDS_STATFS:
1723                 DEBUG_REQ(D_INODE, req, "statfs");
1724                 OBD_FAIL_RETURN(OBD_FAIL_MDS_STATFS_NET, 0);
1725                 rc = mds_statfs(req);
1726                 break;
1727
1728         case MDS_READPAGE:
1729                 DEBUG_REQ(D_INODE, req, "readpage");
1730                 OBD_FAIL_RETURN(OBD_FAIL_MDS_READPAGE_NET, 0);
1731                 rc = mds_readpage(req);
1732
1733                 if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_MDS_SENDPAGE)) {
1734                         if (req->rq_reply_state) {
1735                                 lustre_free_reply_state (req->rq_reply_state);
1736                                 req->rq_reply_state = NULL;
1737                         }
1738                         RETURN(0);
1739                 }
1740
1741                 break;
1742
1743         case MDS_REINT: {
1744                 __u32 *opcp = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*opcp));
1745                 __u32  opc;
1746                 int size[3] = {sizeof(struct mds_body), mds->mds_max_mdsize,
1747                                mds->mds_max_cookiesize};
1748                 int bufcount;
1749
1750                 /* NB only peek inside req now; mds_reint() will swab it */
1751                 if (opcp == NULL) {
1752                         CERROR ("Can't inspect opcode\n");
1753                         rc = -EINVAL;
1754                         break;
1755                 }
1756                 opc = *opcp;
1757                 if (lustre_msg_swabbed (req->rq_reqmsg))
1758                         __swab32s(&opc);
1759
1760                 DEBUG_REQ(D_INODE, req, "reint %d (%s)", opc,
1761                           (opc < sizeof(reint_names) / sizeof(reint_names[0]) ||
1762                            reint_names[opc] == NULL) ? reint_names[opc] :
1763                                                        "unknown opcode");
1764
1765                 OBD_FAIL_RETURN(OBD_FAIL_MDS_REINT_NET, 0);
1766
1767                 if (opc == REINT_UNLINK || opc == REINT_RENAME)
1768                         bufcount = 3;
1769                 else if (opc == REINT_OPEN)
1770                         bufcount = 2;
1771                 else
1772                         bufcount = 1;
1773
1774                 rc = lustre_pack_reply(req, bufcount, size, NULL);
1775                 if (rc)
1776                         break;
1777
1778                 rc = mds_reint(req, 0, NULL);
1779                 fail = OBD_FAIL_MDS_REINT_NET_REP;
1780                 break;
1781         }
1782
1783         case MDS_CLOSE:
1784                 DEBUG_REQ(D_INODE, req, "close");
1785                 OBD_FAIL_RETURN(OBD_FAIL_MDS_CLOSE_NET, 0);
1786                 rc = mds_close(req);
1787                 break;
1788
1789         case MDS_DONE_WRITING:
1790                 DEBUG_REQ(D_INODE, req, "done_writing");
1791                 OBD_FAIL_RETURN(OBD_FAIL_MDS_DONE_WRITING_NET, 0);
1792                 rc = mds_done_writing(req);
1793                 break;
1794
1795         case MDS_PIN:
1796                 DEBUG_REQ(D_INODE, req, "pin");
1797                 OBD_FAIL_RETURN(OBD_FAIL_MDS_PIN_NET, 0);
1798                 rc = mds_pin(req);
1799                 break;
1800
1801         case MDS_SYNC:
1802                 DEBUG_REQ(D_INODE, req, "sync");
1803                 OBD_FAIL_RETURN(OBD_FAIL_MDS_SYNC_NET, 0);
1804                 rc = mds_sync(req);
1805                 break;
1806
1807         case OBD_PING:
1808                 DEBUG_REQ(D_INODE, req, "ping");
1809                 rc = target_handle_ping(req);
1810                 break;
1811
1812         case OBD_LOG_CANCEL:
1813                 CDEBUG(D_INODE, "log cancel\n");
1814                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOG_CANCEL_NET, 0);
1815                 rc = -ENOTSUPP; /* la la la */
1816                 break;
1817
1818         case LDLM_ENQUEUE:
1819                 DEBUG_REQ(D_INODE, req, "enqueue");
1820                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
1821                 rc = ldlm_handle_enqueue(req, ldlm_server_completion_ast,
1822                                          ldlm_server_blocking_ast, NULL);
1823                 break;
1824         case LDLM_CONVERT:
1825                 DEBUG_REQ(D_INODE, req, "convert");
1826                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
1827                 rc = ldlm_handle_convert(req);
1828                 break;
1829         case LDLM_BL_CALLBACK:
1830         case LDLM_CP_CALLBACK:
1831                 DEBUG_REQ(D_INODE, req, "callback");
1832                 CERROR("callbacks should not happen on MDS\n");
1833                 LBUG();
1834                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
1835                 break;
1836         case LLOG_ORIGIN_HANDLE_OPEN:
1837                 DEBUG_REQ(D_INODE, req, "llog_init");
1838                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1839                 rc = llog_origin_handle_open(req);
1840                 break;
1841         case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1842                 DEBUG_REQ(D_INODE, req, "llog next block");
1843                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1844                 rc = llog_origin_handle_next_block(req);
1845                 break;
1846         case LLOG_ORIGIN_HANDLE_PREV_BLOCK:
1847                 DEBUG_REQ(D_INODE, req, "llog prev block");
1848                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1849                 rc = llog_origin_handle_prev_block(req);
1850                 break;
1851         case LLOG_ORIGIN_HANDLE_READ_HEADER:
1852                 DEBUG_REQ(D_INODE, req, "llog read header");
1853                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1854                 rc = llog_origin_handle_read_header(req);
1855                 break;
1856         case LLOG_ORIGIN_HANDLE_CLOSE:
1857                 DEBUG_REQ(D_INODE, req, "llog close");
1858                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1859                 rc = llog_origin_handle_close(req);
1860                 break;
1861         case OST_CREATE:
1862                 DEBUG_REQ(D_INODE, req, "ost_create");
1863                 rc = mdt_obj_create(req);
1864                 break;
1865         case OST_GET_INFO:
1866                 DEBUG_REQ(D_INODE, req, "get_info");
1867                 rc = mdt_get_info(req);
1868                 break;
1869         case OST_SET_INFO:
1870                 DEBUG_REQ(D_INODE, req, "set_info");
1871                 rc = mdt_set_info(req);
1872                 break;
1873         case OST_WRITE:
1874                 CDEBUG(D_INODE, "write\n");
1875                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
1876                 rc = ost_brw_write(req, NULL);
1877                 LASSERT(current->journal_info == NULL);
1878                 /* mdt_brw sends its own replies */
1879                 RETURN(rc);
1880                 break;
1881         case LLOG_CATINFO:
1882                 DEBUG_REQ(D_INODE, req, "llog catinfo");
1883                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1884                 rc = llog_catinfo(req);
1885                 break;
1886         default:
1887                 req->rq_status = -ENOTSUPP;
1888                 rc = ptlrpc_error(req);
1889                 RETURN(rc);
1890         }
1891
1892         LASSERT(current->journal_info == NULL);
1893
1894         EXIT;
1895
1896         /* If we're DISCONNECTing, the mds_export_data is already freed */
1897         if (!rc && req->rq_reqmsg->opc != MDS_DISCONNECT) {
1898                 struct mds_export_data *med = &req->rq_export->exp_mds_data;
1899                 struct obd_device *obd = list_entry(mds, struct obd_device,
1900                                                     u.mds);
1901                 req->rq_repmsg->last_xid =
1902                         le64_to_cpu(med->med_mcd->mcd_last_xid);
1903
1904                 if (!obd->obd_no_transno) {
1905                         req->rq_repmsg->last_committed =
1906                                 obd->obd_last_committed;
1907                 } else {
1908                         DEBUG_REQ(D_IOCTL, req,
1909                                   "not sending last_committed update");
1910                 }
1911                 CDEBUG(D_INFO, "last_transno "LPU64", last_committed "LPU64
1912                        ", xid "LPU64"\n",
1913                        mds->mds_last_transno, obd->obd_last_committed,
1914                        req->rq_xid);
1915         }
1916  out:
1917
1918         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LAST_REPLAY) {
1919                 if (obd && obd->obd_recovering) {
1920                         DEBUG_REQ(D_HA, req, "LAST_REPLAY, queuing reply");
1921                         return target_queue_final_reply(req, rc);
1922                 }
1923                 /* Lost a race with recovery; let the error path DTRT. */
1924                 rc = req->rq_status = -ENOTCONN;
1925         }
1926
1927         target_send_reply(req, rc, fail);
1928         return 0;
1929 }
1930
1931 /* Update the server data on disk.  This stores the new mount_count and
1932  * also the last_rcvd value to disk.  If we don't have a clean shutdown,
1933  * then the server last_rcvd value may be less than that of the clients.
1934  * This will alert us that we may need to do client recovery.
1935  *
1936  * Also assumes for mds_last_transno that we are not modifying it (no locking).
1937  */
1938 int mds_update_server_data(struct obd_device *obd, int force_sync)
1939 {
1940         struct mds_obd *mds = &obd->u.mds;
1941         struct mds_server_data *msd = mds->mds_server_data;
1942         struct file *filp = mds->mds_rcvd_filp;
1943         struct lvfs_run_ctxt saved;
1944         loff_t off = 0;
1945         int rc;
1946         ENTRY;
1947
1948         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1949         msd->msd_last_transno = cpu_to_le64(mds->mds_last_transno);
1950
1951         CDEBUG(D_SUPER, "MDS mount_count is "LPU64", last_transno is "LPU64"\n",
1952                mds->mds_mount_count, mds->mds_last_transno);
1953         rc = fsfilt_write_record(obd, filp, msd, sizeof(*msd), &off,force_sync);
1954         if (rc)
1955                 CERROR("error writing MDS server data: rc = %d\n", rc);
1956         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1957
1958         RETURN(rc);
1959 }
1960
1961 /* mount the file system (secretly) */
1962 static int mds_setup(struct obd_device *obd, obd_count len, void *buf)
1963 {
1964         struct lustre_cfg* lcfg = buf;
1965         struct mds_obd *mds = &obd->u.mds;
1966         char *options = NULL;
1967         struct vfsmount *mnt;
1968         unsigned long page;
1969         int rc = 0;
1970         ENTRY;
1971
1972         dev_clear_rdonly(2);
1973
1974         if (!lcfg->lcfg_inlbuf1 || !lcfg->lcfg_inlbuf2)
1975                 RETURN(rc = -EINVAL);
1976
1977         obd->obd_fsops = fsfilt_get_ops(lcfg->lcfg_inlbuf2);
1978         if (IS_ERR(obd->obd_fsops))
1979                 RETURN(rc = PTR_ERR(obd->obd_fsops));
1980
1981         mds->mds_max_mdsize = sizeof(struct lov_mds_md);
1982
1983         page = __get_free_page(GFP_KERNEL);
1984         if (!page)
1985                 RETURN(-ENOMEM);
1986
1987         options = (char *)page;
1988         memset(options, 0, PAGE_SIZE);
1989
1990         /* here we use "iopen_nopriv" hardcoded, because it affects MDS utility
1991          * and the rest of options are passed by mount options. Probably this
1992          * should be moved to somewhere else like startup scripts or lconf. */
1993         sprintf(options, "iopen_nopriv");
1994
1995         if (lcfg->lcfg_inllen4 > 0 && lcfg->lcfg_inlbuf4)
1996                 sprintf(options + strlen(options), ",%s",
1997                         lcfg->lcfg_inlbuf4);
1998
1999         /* we have to know mdsnum before touching underlying fs -bzzz */
2000         sema_init(&mds->mds_lmv_sem, 1);
2001         if (lcfg->lcfg_inllen5 > 0 && lcfg->lcfg_inlbuf5 &&
2002             strcmp(lcfg->lcfg_inlbuf5, "dumb")) {
2003                 class_uuid_t uuid;
2004
2005                 CDEBUG(D_OTHER, "MDS: %s is master for %s\n",
2006                        obd->obd_name, lcfg->lcfg_inlbuf5);
2007
2008                 generate_random_uuid(uuid);
2009                 class_uuid_unparse(uuid, &mds->mds_lmv_uuid);
2010
2011                 OBD_ALLOC(mds->mds_lmv_name, lcfg->lcfg_inllen5);
2012                 if (mds->mds_lmv_name == NULL)
2013                         RETURN(rc = -ENOMEM);
2014
2015                 memcpy(mds->mds_lmv_name, lcfg->lcfg_inlbuf5,
2016                        lcfg->lcfg_inllen5);
2017
2018                 rc = mds_lmv_connect(obd, mds->mds_lmv_name);
2019                 if (rc) {
2020                         OBD_FREE(mds->mds_lmv_name, lcfg->lcfg_inllen5);
2021                         GOTO(err_ops, rc);
2022                 }
2023         }
2024
2025         /* FIXME-WANGDI: this should be reworked when we will use lmv along
2026          * with cobd, because correct mdsnum is set in mds_lmv_connect(). */
2027         if (lcfg->lcfg_inllen6 > 0 && lcfg->lcfg_inlbuf6 && !mds->mds_lmv_obd &&
2028             strcmp(lcfg->lcfg_inlbuf6, "dumb")) {
2029                 if (!memcmp(lcfg->lcfg_inlbuf6, "master", strlen("master")) &&
2030                     mds->mds_num == 0) {
2031                         mds->mds_num = REAL_MDS_NUMBER;
2032                 } else if (!memcmp(lcfg->lcfg_inlbuf6, "cache", strlen("cache")) &&
2033                            mds->mds_num == 0) {
2034                         mds->mds_num = CACHE_MDS_NUMBER;
2035                 }
2036         }
2037
2038         mnt = do_kern_mount(lcfg->lcfg_inlbuf2, 0,
2039                             lcfg->lcfg_inlbuf1, options);
2040
2041         free_page(page);
2042
2043         if (IS_ERR(mnt)) {
2044                 rc = PTR_ERR(mnt);
2045                 CERROR("do_kern_mount failed: rc = %d\n", rc);
2046                 GOTO(err_ops, rc);
2047         }
2048
2049         CDEBUG(D_SUPER, "%s: mnt = %p\n", lcfg->lcfg_inlbuf1, mnt);
2050
2051         sema_init(&mds->mds_orphan_recovery_sem, 1);
2052         sema_init(&mds->mds_epoch_sem, 1);
2053         spin_lock_init(&mds->mds_transno_lock);
2054         mds->mds_max_cookiesize = sizeof(struct llog_cookie);
2055         atomic_set(&mds->mds_open_count, 0);
2056         atomic_set(&mds->mds_real_clients, 0);
2057
2058         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
2059                                                 LDLM_NAMESPACE_SERVER);
2060         if (obd->obd_namespace == NULL) {
2061                 mds_cleanup(obd, 0);
2062                 GOTO(err_put, rc = -ENOMEM);
2063         }
2064         ldlm_register_intent(obd->obd_namespace, mds_intent_policy);
2065
2066         rc = mds_fs_setup(obd, mnt);
2067         if (rc) {
2068                 CERROR("MDS filesystem method init failed: rc = %d\n", rc);
2069                 GOTO(err_ns, rc);
2070         }
2071
2072         rc = llog_start_commit_thread();
2073         if (rc < 0)
2074                 GOTO(err_fs, rc);
2075
2076         /* this check for @dumb string is needed to handle mounting MDS with
2077          * smfs. Read lconf:MDSDEV.write_conf() for more details. */
2078         if (lcfg->lcfg_inllen3 > 0 && lcfg->lcfg_inlbuf3 &&
2079             strcmp(lcfg->lcfg_inlbuf3, "dumb")) {
2080                 class_uuid_t uuid;
2081
2082                 generate_random_uuid(uuid);
2083                 class_uuid_unparse(uuid, &mds->mds_lov_uuid);
2084
2085                 OBD_ALLOC(mds->mds_profile, lcfg->lcfg_inllen3);
2086                 if (mds->mds_profile == NULL)
2087                         GOTO(err_fs, rc = -ENOMEM);
2088
2089                 memcpy(mds->mds_profile, lcfg->lcfg_inlbuf3,
2090                        lcfg->lcfg_inllen3);
2091         }
2092
2093         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
2094                            "mds_ldlm_client", &obd->obd_ldlm_client);
2095         obd->obd_replayable = 1;
2096
2097         rc = mds_postsetup(obd);
2098         if (rc)
2099                 GOTO(err_fs, rc);
2100
2101         RETURN(0);
2102
2103 err_fs:
2104         /* No extra cleanup needed for llog_init_commit_thread() */
2105         mds_fs_cleanup(obd, 0);
2106 err_ns:
2107         ldlm_namespace_free(obd->obd_namespace, 0);
2108         obd->obd_namespace = NULL;
2109 err_put:
2110         unlock_kernel();
2111         mntput(mds->mds_vfsmnt);
2112         mds->mds_sb = 0;
2113         lock_kernel();
2114 err_ops:
2115         fsfilt_put_ops(obd->obd_fsops);
2116         return rc;
2117 }
2118
2119 static int mds_postsetup(struct obd_device *obd)
2120 {
2121         struct mds_obd *mds = &obd->u.mds;
2122         int rc = 0;
2123         ENTRY;
2124
2125         rc = obd_llog_setup(obd, &obd->obd_llogs, LLOG_CONFIG_ORIG_CTXT,
2126                             obd, 0, NULL, &llog_lvfs_ops);
2127         if (rc)
2128                 RETURN(rc);
2129
2130         if (mds->mds_profile) {
2131                 struct llog_ctxt *lgctxt;
2132                 struct lvfs_run_ctxt saved;
2133                 struct lustre_profile *lprof;
2134                 struct config_llog_instance cfg;
2135
2136                 cfg.cfg_instance = NULL;
2137                 cfg.cfg_uuid = mds->mds_lov_uuid;
2138                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2139
2140                 lgctxt = llog_get_context(&obd->obd_llogs, LLOG_CONFIG_ORIG_CTXT);
2141                 if (!lgctxt) {
2142                         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2143                         GOTO(err_llog, rc = -EINVAL);
2144                 }
2145
2146                 rc = class_config_process_llog(lgctxt, mds->mds_profile, &cfg);
2147                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2148
2149                 if (rc)
2150                         GOTO(err_llog, rc);
2151
2152                 lprof = class_get_profile(mds->mds_profile);
2153                 if (lprof == NULL) {
2154                         CERROR("No profile found: %s\n", mds->mds_profile);
2155                         GOTO(err_cleanup, rc = -ENOENT);
2156                 }
2157                 rc = mds_lov_connect(obd, lprof->lp_osc);
2158                 if (rc)
2159                         GOTO(err_cleanup, rc);
2160
2161                 rc = mds_lmv_postsetup(obd);
2162                 if (rc)
2163                         GOTO(err_cleanup, rc);
2164         }
2165
2166         RETURN(rc);
2167
2168 err_cleanup:
2169         mds_lov_clean(obd);
2170 err_llog:
2171         obd_llog_cleanup(llog_get_context(&obd->obd_llogs,
2172                                           LLOG_CONFIG_ORIG_CTXT));
2173         RETURN(rc);
2174 }
2175
2176 int mds_postrecov(struct obd_device *obd)
2177 {
2178         struct mds_obd *mds = &obd->u.mds;
2179         struct llog_ctxt *ctxt;
2180         int rc, item = 0;
2181         ENTRY;
2182
2183         LASSERT(!obd->obd_recovering);
2184         ctxt = llog_get_context(&obd->obd_llogs, LLOG_UNLINK_ORIG_CTXT);
2185         LASSERT(ctxt != NULL);
2186
2187         /* set nextid first, so we are sure it happens */
2188         rc = mds_lov_set_nextid(obd);
2189         if (rc) {
2190                 CERROR("%s: mds_lov_set_nextid failed\n", obd->obd_name);
2191                 GOTO(out, rc);
2192         }
2193
2194         /* clean PENDING dir */
2195         rc = mds_cleanup_orphans(obd);
2196         if (rc < 0)
2197                 GOTO(out, rc);
2198         item = rc;
2199
2200         rc = llog_connect(ctxt, obd->u.mds.mds_lov_desc.ld_tgt_count,
2201                           NULL, NULL, NULL);
2202         if (rc) {
2203                 CERROR("%s: failed at llog_origin_connect: %d\n",
2204                        obd->obd_name, rc);
2205                 GOTO(out, rc);
2206         }
2207
2208         /* remove the orphaned precreated objects */
2209         rc = mds_lov_clearorphans(mds, NULL /* all OSTs */);
2210         if (rc)
2211                 GOTO(err_llog, rc);
2212
2213 out:
2214         RETURN(rc < 0 ? rc : item);
2215
2216 err_llog:
2217         /* cleanup all llogging subsystems */
2218         rc = obd_llog_finish(obd, &obd->obd_llogs,
2219                              mds->mds_lov_desc.ld_tgt_count);
2220         if (rc)
2221                 CERROR("%s: failed to cleanup llogging subsystems\n",
2222                         obd->obd_name);
2223         goto out;
2224 }
2225
2226 int mds_lov_clean(struct obd_device *obd)
2227 {
2228         struct mds_obd *mds = &obd->u.mds;
2229
2230         if (mds->mds_profile) {
2231                 char * cln_prof;
2232                 struct config_llog_instance cfg;
2233                 struct lvfs_run_ctxt saved;
2234                 int len = strlen(mds->mds_profile) + sizeof("-clean") + 1;
2235
2236                 OBD_ALLOC(cln_prof, len);
2237                 sprintf(cln_prof, "%s-clean", mds->mds_profile);
2238
2239                 cfg.cfg_instance = NULL;
2240                 cfg.cfg_uuid = mds->mds_lov_uuid;
2241
2242                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2243                 class_config_process_llog(llog_get_context(&obd->obd_llogs, LLOG_CONFIG_ORIG_CTXT),
2244                                           cln_prof, &cfg);
2245                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
2246
2247                 OBD_FREE(cln_prof, len);
2248                 OBD_FREE(mds->mds_profile, strlen(mds->mds_profile) + 1);
2249                 mds->mds_profile = NULL;
2250         }
2251         RETURN(0);
2252 }
2253
2254 int mds_lmv_clean(struct obd_device *obd)
2255 {
2256         struct mds_obd *mds = &obd->u.mds;
2257
2258         if (mds->mds_lmv_name) {
2259                 OBD_FREE(mds->mds_lmv_name, strlen(mds->mds_lmv_name) + 1);
2260                 mds->mds_lmv_name = NULL;
2261         }
2262         RETURN(0);
2263 }
2264
2265 static int mds_precleanup(struct obd_device *obd, int flags)
2266 {
2267         int rc = 0;
2268         ENTRY;
2269
2270         mds_lmv_clean(obd);
2271         mds_lov_disconnect(obd, flags);
2272         mds_lov_clean(obd);
2273         obd_llog_cleanup(llog_get_context(&obd->obd_llogs, LLOG_CONFIG_ORIG_CTXT));
2274         RETURN(rc);
2275 }
2276
2277 static int mds_cleanup(struct obd_device *obd, int flags)
2278 {
2279         struct mds_obd *mds = &obd->u.mds;
2280         ENTRY;
2281
2282         if (mds->mds_sb == NULL)
2283                 RETURN(0);
2284
2285         mds_update_server_data(obd, 1);
2286         if (mds->mds_lov_objids != NULL) {
2287                 OBD_FREE(mds->mds_lov_objids,
2288                          mds->mds_lov_desc.ld_tgt_count * sizeof(obd_id));
2289         }
2290         mds_fs_cleanup(obd, flags);
2291
2292         unlock_kernel();
2293
2294         /* 2 seems normal on mds, (may_umount() also expects 2
2295           fwiw), but we only see 1 at this point in obdfilter. */
2296         if (atomic_read(&obd->u.mds.mds_vfsmnt->mnt_count) > 2)
2297                 CERROR("%s: mount busy, mnt_count %d != 2\n", obd->obd_name,
2298                        atomic_read(&obd->u.mds.mds_vfsmnt->mnt_count));
2299
2300         mntput(mds->mds_vfsmnt);
2301
2302         mds->mds_sb = 0;
2303
2304         ldlm_namespace_free(obd->obd_namespace, flags & OBD_OPT_FORCE);
2305
2306         spin_lock_bh(&obd->obd_processing_task_lock);
2307         if (obd->obd_recovering) {
2308                 target_cancel_recovery_timer(obd);
2309                 obd->obd_recovering = 0;
2310         }
2311         spin_unlock_bh(&obd->obd_processing_task_lock);
2312
2313         lock_kernel();
2314         dev_clear_rdonly(2);
2315         fsfilt_put_ops(obd->obd_fsops);
2316
2317         RETURN(0);
2318 }
2319
2320 static void fixup_handle_for_resent_req(struct ptlrpc_request *req,
2321                                         struct ldlm_lock *new_lock,
2322                                         struct lustre_handle *lockh)
2323 {
2324         struct obd_export *exp = req->rq_export;
2325         struct obd_device *obd = exp->exp_obd;
2326         struct ldlm_request *dlmreq =
2327                 lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*dlmreq));
2328         struct lustre_handle remote_hdl = dlmreq->lock_handle1;
2329         struct list_head *iter;
2330
2331         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
2332                 return;
2333
2334         l_lock(&obd->obd_namespace->ns_lock);
2335         list_for_each(iter, &exp->exp_ldlm_data.led_held_locks) {
2336                 struct ldlm_lock *lock;
2337                 lock = list_entry(iter, struct ldlm_lock, l_export_chain);
2338                 if (lock == new_lock)
2339                         continue;
2340                 if (lock->l_remote_handle.cookie == remote_hdl.cookie) {
2341                         lockh->cookie = lock->l_handle.h_cookie;
2342                         DEBUG_REQ(D_HA, req, "restoring lock cookie "LPX64,
2343                                   lockh->cookie);
2344                         l_unlock(&obd->obd_namespace->ns_lock);
2345                         return;
2346                 }
2347         }
2348         l_unlock(&obd->obd_namespace->ns_lock);
2349
2350         /* If the xid matches, then we know this is a resent request,
2351          * and allow it. (It's probably an OPEN, for which we don't
2352          * send a lock */
2353         if (req->rq_xid == exp->exp_mds_data.med_mcd->mcd_last_xid)
2354                 return;
2355
2356         /* This remote handle isn't enqueued, so we never received or
2357          * processed this request.  Clear MSG_RESENT, because it can
2358          * be handled like any normal request now. */
2359
2360         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
2361
2362         DEBUG_REQ(D_HA, req, "no existing lock with rhandle "LPX64,
2363                   remote_hdl.cookie);
2364 }
2365
2366 int intent_disposition(struct ldlm_reply *rep, int flag)
2367 {
2368         if (!rep)
2369                 return 0;
2370         return (rep->lock_policy_res1 & flag);
2371 }
2372
2373 void intent_set_disposition(struct ldlm_reply *rep, int flag)
2374 {
2375         if (!rep)
2376                 return;
2377         rep->lock_policy_res1 |= flag;
2378 }
2379
2380 static int mds_intent_policy(struct ldlm_namespace *ns,
2381                              struct ldlm_lock **lockp, void *req_cookie,
2382                              ldlm_mode_t mode, int flags, void *data)
2383 {
2384         struct ptlrpc_request *req = req_cookie;
2385         struct ldlm_lock *lock = *lockp;
2386         struct ldlm_intent *it;
2387         struct mds_obd *mds = &req->rq_export->exp_obd->u.mds;
2388         struct ldlm_reply *rep;
2389         struct lustre_handle lockh = { 0 };
2390         struct ldlm_lock *new_lock;
2391         int getattr_part = MDS_INODELOCK_UPDATE;
2392         int rc, offset = 2, repsize[4] = {sizeof(struct ldlm_reply),
2393                                           sizeof(struct mds_body),
2394                                           mds->mds_max_mdsize,
2395                                           mds->mds_max_cookiesize};
2396         ENTRY;
2397
2398         LASSERT(req != NULL);
2399
2400         if (req->rq_reqmsg->bufcount <= 1) {
2401                 /* No intent was provided */
2402                 int size = sizeof(struct ldlm_reply);
2403                 rc = lustre_pack_reply(req, 1, &size, NULL);
2404                 LASSERT(rc == 0);
2405                 RETURN(0);
2406         }
2407
2408         it = lustre_swab_reqbuf(req, 1, sizeof(*it), lustre_swab_ldlm_intent);
2409         if (it == NULL) {
2410                 CERROR("Intent missing\n");
2411                 RETURN(req->rq_status = -EFAULT);
2412         }
2413
2414         LDLM_DEBUG(lock, "intent policy, opc: %s", ldlm_it2str(it->opc));
2415
2416         rc = lustre_pack_reply(req, 3, repsize, NULL);
2417         if (rc)
2418                 RETURN(req->rq_status = rc);
2419
2420         rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*rep));
2421         intent_set_disposition(rep, DISP_IT_EXECD);
2422
2423         fixup_handle_for_resent_req(req, lock, &lockh);
2424
2425         /* execute policy */
2426         switch ((long)it->opc) {
2427         case IT_OPEN:
2428         case IT_CREAT|IT_OPEN:
2429                 /* XXX swab here to assert that an mds_open reint
2430                  * packet is following */
2431                 rep->lock_policy_res2 = mds_reint(req, offset, &lockh);
2432 #if 0
2433                 /* We abort the lock if the lookup was negative and
2434                  * we did not make it to the OPEN portion */
2435                 if (!intent_disposition(rep, DISP_LOOKUP_EXECD))
2436                         RETURN(ELDLM_LOCK_ABORTED);
2437                 if (intent_disposition(rep, DISP_LOOKUP_NEG) &&
2438                     !intent_disposition(rep, DISP_OPEN_OPEN))
2439 #endif
2440                 /* IT_OPEN may return lock on cross-node dentry
2441                  * that we want to hold during attr retrival -bzzz */
2442                 if (rc != 0 || lockh.cookie == 0)
2443                         RETURN(ELDLM_LOCK_ABORTED);
2444                 break;
2445         case IT_LOOKUP:
2446                 getattr_part = MDS_INODELOCK_LOOKUP;
2447         case IT_CHDIR:
2448         case IT_GETATTR:
2449                 getattr_part |= MDS_INODELOCK_LOOKUP;
2450         case IT_READDIR:
2451                 rep->lock_policy_res2 = mds_getattr_name(offset, req, &lockh,
2452                                                          getattr_part);
2453                 /* FIXME: LDLM can set req->rq_status. MDS sets
2454                    policy_res{1,2} with disposition and status.
2455                    - replay: returns 0 & req->status is old status
2456                    - otherwise: returns req->status */
2457                 if (intent_disposition(rep, DISP_LOOKUP_NEG))
2458                         rep->lock_policy_res2 = 0;
2459                 if (!intent_disposition(rep, DISP_LOOKUP_POS) ||
2460                     rep->lock_policy_res2)
2461                         RETURN(ELDLM_LOCK_ABORTED);
2462                 if (req->rq_status != 0) {
2463                         LBUG();
2464                         rep->lock_policy_res2 = req->rq_status;
2465                         RETURN(ELDLM_LOCK_ABORTED);
2466                 }
2467                 break;
2468         case IT_UNLINK:
2469                 rc = mds_lock_and_check_slave(offset, req, &lockh);
2470                 if ((rep->lock_policy_res2 = rc)) {
2471                         if (rc == ENOLCK)
2472                                 rep->lock_policy_res2 = 0;
2473                         RETURN(ELDLM_LOCK_ABORTED);
2474                 }
2475                 break;
2476         default:
2477                 CERROR("Unhandled intent "LPD64"\n", it->opc);
2478                 LBUG();
2479         }
2480
2481         /* By this point, whatever function we called above must have either
2482          * filled in 'lockh', been an intent replay, or returned an error.  We
2483          * want to allow replayed RPCs to not get a lock, since we would just
2484          * drop it below anyways because lock replay is done separately by the
2485          * client afterwards.  For regular RPCs we want to give the new lock to
2486          * the client instead of whatever lock it was about to get. */
2487         new_lock = ldlm_handle2lock(&lockh);
2488         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY))
2489                 RETURN(0);
2490
2491         LASSERT(new_lock != NULL);
2492
2493         /* If we've already given this lock to a client once, then we should
2494          * have no readers or writers.  Otherwise, we should have one reader
2495          * _or_ writer ref (which will be zeroed below) before returning the
2496          * lock to a client. */
2497         if (new_lock->l_export == req->rq_export) {
2498                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
2499         } else {
2500                 LASSERT(new_lock->l_export == NULL);
2501                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
2502         }
2503
2504         *lockp = new_lock;
2505
2506         if (new_lock->l_export == req->rq_export) {
2507                 /* Already gave this to the client, which means that we
2508                  * reconstructed a reply. */
2509                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
2510                         MSG_RESENT);
2511                 RETURN(ELDLM_LOCK_REPLACED);
2512         }
2513
2514         /* Fixup the lock to be given to the client */
2515         l_lock(&new_lock->l_resource->lr_namespace->ns_lock);
2516         new_lock->l_readers = 0;
2517         new_lock->l_writers = 0;
2518
2519         new_lock->l_export = class_export_get(req->rq_export);
2520         list_add(&new_lock->l_export_chain,
2521                  &new_lock->l_export->exp_ldlm_data.led_held_locks);
2522
2523         new_lock->l_blocking_ast = lock->l_blocking_ast;
2524         new_lock->l_completion_ast = lock->l_completion_ast;
2525
2526         memcpy(&new_lock->l_remote_handle, &lock->l_remote_handle,
2527                sizeof(lock->l_remote_handle));
2528
2529         new_lock->l_flags &= ~LDLM_FL_LOCAL;
2530
2531         LDLM_LOCK_PUT(new_lock);
2532         l_unlock(&new_lock->l_resource->lr_namespace->ns_lock);
2533
2534         RETURN(ELDLM_LOCK_REPLACED);
2535 }
2536
2537 int mds_attach(struct obd_device *dev, obd_count len, void *data)
2538 {
2539         struct lprocfs_static_vars lvars;
2540
2541         lprocfs_init_multi_vars(0, &lvars);
2542         return lprocfs_obd_attach(dev, lvars.obd_vars);
2543 }
2544
2545 int mds_detach(struct obd_device *dev)
2546 {
2547         return lprocfs_obd_detach(dev);
2548 }
2549
2550 int mdt_attach(struct obd_device *dev, obd_count len, void *data)
2551 {
2552         struct lprocfs_static_vars lvars;
2553
2554         lprocfs_init_multi_vars(1, &lvars);
2555         return lprocfs_obd_attach(dev, lvars.obd_vars);
2556 }
2557
2558 int mdt_detach(struct obd_device *dev)
2559 {
2560         return lprocfs_obd_detach(dev);
2561 }
2562
2563 static int mdt_setup(struct obd_device *obd, obd_count len, void *buf)
2564 {
2565         struct mds_obd *mds = &obd->u.mds;
2566         int rc = 0;
2567         ENTRY;
2568
2569         mds->mds_service =
2570                 ptlrpc_init_svc(MDS_NBUFS, MDS_BUFSIZE, MDS_MAXREQSIZE,
2571                                 MDS_REQUEST_PORTAL, MDC_REPLY_PORTAL,
2572                                 mds_handle, "mds", obd->obd_proc_entry);
2573
2574         if (!mds->mds_service) {
2575                 CERROR("failed to start service\n");
2576                 RETURN(-ENOMEM);
2577         }
2578
2579         rc = ptlrpc_start_n_threads(obd, mds->mds_service, MDT_NUM_THREADS,
2580                                     "ll_mdt");
2581         if (rc)
2582                 GOTO(err_thread, rc);
2583
2584         mds->mds_setattr_service =
2585                 ptlrpc_init_svc(MDS_NBUFS, MDS_BUFSIZE, MDS_MAXREQSIZE,
2586                                 MDS_SETATTR_PORTAL, MDC_REPLY_PORTAL,
2587                                 mds_handle, "mds_setattr",
2588                                 obd->obd_proc_entry);
2589         if (!mds->mds_setattr_service) {
2590                 CERROR("failed to start getattr service\n");
2591                 GOTO(err_thread, rc = -ENOMEM);
2592         }
2593
2594         rc = ptlrpc_start_n_threads(obd, mds->mds_setattr_service,
2595                                     MDT_NUM_THREADS, "ll_mdt_attr");
2596         if (rc)
2597                 GOTO(err_thread2, rc);
2598
2599         mds->mds_readpage_service =
2600                 ptlrpc_init_svc(MDS_NBUFS, MDS_BUFSIZE, MDS_MAXREQSIZE,
2601                                 MDS_READPAGE_PORTAL, MDC_REPLY_PORTAL,
2602                                 mds_handle, "mds_readpage",
2603                                 obd->obd_proc_entry);
2604         if (!mds->mds_readpage_service) {
2605                 CERROR("failed to start readpage service\n");
2606                 GOTO(err_thread2, rc = -ENOMEM);
2607         }
2608
2609         rc = ptlrpc_start_n_threads(obd, mds->mds_readpage_service,
2610                                     MDT_NUM_THREADS, "ll_mdt_rdpg");
2611
2612         if (rc)
2613                 GOTO(err_thread3, rc);
2614
2615         RETURN(0);
2616
2617 err_thread3:
2618         ptlrpc_unregister_service(mds->mds_readpage_service);
2619 err_thread2:
2620         ptlrpc_unregister_service(mds->mds_setattr_service);
2621 err_thread:
2622         ptlrpc_unregister_service(mds->mds_service);
2623         return rc;
2624 }
2625
2626 static int mdt_cleanup(struct obd_device *obd, int flags)
2627 {
2628         struct mds_obd *mds = &obd->u.mds;
2629         ENTRY;
2630
2631         ptlrpc_stop_all_threads(mds->mds_readpage_service);
2632         ptlrpc_unregister_service(mds->mds_readpage_service);
2633
2634         ptlrpc_stop_all_threads(mds->mds_setattr_service);
2635         ptlrpc_unregister_service(mds->mds_setattr_service);
2636
2637         ptlrpc_stop_all_threads(mds->mds_service);
2638         ptlrpc_unregister_service(mds->mds_service);
2639
2640         RETURN(0);
2641 }
2642
2643 static struct dentry *mds_lvfs_fid2dentry(__u64 id, __u32 gen, __u64 gr,
2644                                           void *data)
2645 {
2646         struct obd_device *obd = data;
2647         struct ll_fid fid;
2648         fid.id = id;
2649         fid.generation = gen;
2650         return mds_fid2dentry(&obd->u.mds, &fid, NULL);
2651 }
2652
2653 static int mds_get_info(struct obd_export *exp, __u32 keylen,
2654                         void *key, __u32 *vallen, void *val)
2655 {
2656         struct obd_device *obd;
2657         struct mds_obd *mds;
2658         ENTRY;
2659
2660         obd = class_exp2obd(exp);
2661         if (obd == NULL) {
2662                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
2663                        exp->exp_handle.h_cookie);
2664                 RETURN(-EINVAL);
2665         }
2666
2667         if (keylen >= strlen("reint_log") && memcmp(key, "reint_log", 9) == 0) {
2668                 /*Get log_context handle*/
2669                 unsigned long *llh_handle = val;
2670                 *vallen = sizeof(unsigned long);
2671                 *llh_handle = (unsigned long)obd->obd_llog_ctxt[LLOG_REINT_ORIG_CTXT];
2672                 RETURN(0);
2673         }
2674         if (keylen >= strlen("cache_sb") && memcmp(key, "cache_sb", 8) == 0) {
2675                 /*Get log_context handle*/
2676                 unsigned long *sb = val;
2677                 *vallen = sizeof(unsigned long);
2678                 *sb = (unsigned long)obd->u.mds.mds_sb;
2679                 RETURN(0);
2680         }
2681
2682         mds = &obd->u.mds;
2683         keylen == strlen("mdsize");
2684         if (keylen && memcmp(key, "mdsize", keylen) == 0) {
2685                 __u32 *mdsize = val;
2686                 *vallen = sizeof(*mdsize);
2687                 *mdsize = mds->mds_max_mdsize;
2688                 RETURN(0);
2689         }
2690
2691         CDEBUG(D_IOCTL, "invalid key\n");
2692         RETURN(-EINVAL);
2693
2694 }
2695 struct lvfs_callback_ops mds_lvfs_ops = {
2696         l_fid2dentry:     mds_lvfs_fid2dentry,
2697 };
2698
2699 int mds_preprw(int cmd, struct obd_export *exp, struct obdo *oa,
2700                 int objcount, struct obd_ioobj *obj,
2701                 int niocount, struct niobuf_remote *nb,
2702                 struct niobuf_local *res,
2703                 struct obd_trans_info *oti);
2704 int mds_commitrw(int cmd, struct obd_export *exp, struct obdo *oa,
2705                  int objcount, struct obd_ioobj *obj, int niocount,
2706                  struct niobuf_local *res, struct obd_trans_info *oti,
2707                  int rc);
2708
2709 /* use obd ops to offer management infrastructure */
2710 static struct obd_ops mds_obd_ops = {
2711         .o_owner           = THIS_MODULE,
2712         .o_attach          = mds_attach,
2713         .o_detach          = mds_detach,
2714         .o_connect         = mds_connect,
2715         .o_init_export     = mds_init_export,
2716         .o_destroy_export  = mds_destroy_export,
2717         .o_disconnect      = mds_disconnect,
2718         .o_setup           = mds_setup,
2719         .o_precleanup      = mds_precleanup,
2720         .o_cleanup         = mds_cleanup,
2721         .o_postrecov       = mds_postrecov,
2722         .o_statfs          = mds_obd_statfs,
2723         .o_iocontrol       = mds_iocontrol,
2724         .o_create          = mds_obd_create,
2725         .o_destroy         = mds_obd_destroy,
2726         .o_llog_init       = mds_llog_init,
2727         .o_llog_finish     = mds_llog_finish,
2728         .o_notify          = mds_notify,
2729         .o_get_info        = mds_get_info,
2730         .o_set_info        = mds_set_info,
2731         .o_preprw          = mds_preprw,
2732         .o_commitrw        = mds_commitrw,
2733 };
2734
2735 static struct obd_ops mdt_obd_ops = {
2736         .o_owner           = THIS_MODULE,
2737         .o_attach          = mdt_attach,
2738         .o_detach          = mdt_detach,
2739         .o_setup           = mdt_setup,
2740         .o_cleanup         = mdt_cleanup,
2741         .o_attach          = mdt_attach,
2742         .o_detach          = mdt_detach,
2743 };
2744
2745 static int __init mds_init(void)
2746 {
2747         struct lprocfs_static_vars lvars;
2748
2749         lprocfs_init_multi_vars(0, &lvars);
2750         class_register_type(&mds_obd_ops, NULL, lvars.module_vars,
2751                             LUSTRE_MDS_NAME);
2752         lprocfs_init_multi_vars(1, &lvars);
2753         class_register_type(&mdt_obd_ops, NULL, lvars.module_vars,
2754                             LUSTRE_MDT_NAME);
2755
2756         return 0;
2757 }
2758
2759 static void /*__exit*/ mds_exit(void)
2760 {
2761         class_unregister_type(LUSTRE_MDS_NAME);
2762         class_unregister_type(LUSTRE_MDT_NAME);
2763 }
2764
2765 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
2766 MODULE_DESCRIPTION("Lustre Metadata Server (MDS)");
2767 MODULE_LICENSE("GPL");
2768
2769 module_init(mds_init);
2770 module_exit(mds_exit);