lustre/mds/mds_reint.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  linux/mds/mds_reint.c
   5  *  Lustre Metadata Server (mds) reintegration routines
   6  *
   7  *  Copyright (C) 2002, 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  *
  12  *   This file is part of Lustre, http://www.lustre.org.
  13  *
  14  *   Lustre is free software; you can redistribute it and/or
  15  *   modify it under the terms of version 2 of the GNU General Public
  16  *   License as published by the Free Software Foundation.
  17  *
  18  *   Lustre is distributed in the hope that it will be useful,
  19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *   GNU General Public License for more details.
  22  *
  23  *   You should have received a copy of the GNU General Public License
  24  *   along with Lustre; if not, write to the Free Software
  25  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #ifndef EXPORT_SYMTAB
  29 # define EXPORT_SYMTAB
  30 #endif
  31 #define DEBUG_SUBSYSTEM S_MDS
  32
  33 #include <linux/fs.h>
  34 #include <linux/jbd.h>
  35 #include <linux/namei.h>
  36 #include <linux/ext3_fs.h>
  37 #include <linux/obd_support.h>
  38 #include <linux/obd_class.h>
  39 #include <linux/obd.h>
  40 #include <linux/lustre_lib.h>
  41 #include <linux/lustre_idl.h>
  42 #include <linux/lustre_mds.h>
  43 #include <linux/lustre_dlm.h>
  44 #include <linux/lustre_log.h>
  45 #include <linux/lustre_fsfilt.h>
  46 #include <linux/lustre_acl.h>
  47 #include <linux/lustre_lite.h>
  48 #include <linux/lustre_smfs.h>
  49 #include "mds_internal.h"
  50
  51 struct mds_logcancel_data {
  52         struct lov_mds_md      *mlcd_lmm;
  53         int                     mlcd_size;
  54         int                     mlcd_cookielen;
  55         int                     mlcd_eadatalen;
  56         struct llog_cookie      mlcd_cookies[0];
  57 };
  58
  59 static void mds_cancel_cookies_cb(struct obd_device *obd,
  60                                   __u64 transno, void *cb_data,
  61                                   int error)
  62 {
  63         struct mds_logcancel_data *mlcd = cb_data;
  64         struct lov_stripe_md *lsm = NULL;
  65         struct llog_ctxt *ctxt;
  66         int rc;
  67
  68         obd_transno_commit_cb(obd, transno, error);
  69
  70         CDEBUG(D_HA, "cancelling %d cookies\n",
  71                (int)(mlcd->mlcd_cookielen / sizeof(*mlcd->mlcd_cookies)));
  72
  73         rc = obd_unpackmd(obd->u.mds.mds_dt_exp, &lsm, mlcd->mlcd_lmm,
  74                           mlcd->mlcd_eadatalen);
  75         if (rc < 0) {
  76                 CERROR("bad LSM cancelling %d log cookies: rc %d\n",
  77                        (int)(mlcd->mlcd_cookielen/sizeof(*mlcd->mlcd_cookies)),
  78                        rc);
  79         } else {
  80                 ///* XXX 0 normally, SENDNOW for debug */);
  81                 ctxt = llog_get_context(&obd->obd_llogs,
  82                                         mlcd->mlcd_cookies[0].lgc_subsys + 1);
  83                 rc = llog_cancel(ctxt, mlcd->mlcd_cookielen /
  84                                  sizeof(*mlcd->mlcd_cookies),
  85                                  mlcd->mlcd_cookies, OBD_LLOG_FL_SENDNOW, lsm);
  86                 if (rc)
  87                         CERROR("error cancelling %d log cookies: rc %d\n",
  88                                (int)(mlcd->mlcd_cookielen /
  89                                      sizeof(*mlcd->mlcd_cookies)), rc);
  90                 obd_free_memmd(obd->u.mds.mds_dt_exp, &lsm);
  91         }
  92
  93         OBD_FREE(mlcd, mlcd->mlcd_size);
  94 }
  95
  96 /* Assumes caller has already pushed us into the kernel context. */
  97 int mds_finish_transno(struct mds_obd *mds, struct inode *inode, void *handle,
  98                        struct ptlrpc_request *req, int rc, __u32 op_data)
  99 {
 100         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 101         struct obd_device *obd = req->rq_export->exp_obd;
 102         struct mds_client_data *mcd = med->med_mcd;
 103         int err, log_pri = D_HA;
 104         __u64 transno;
 105         loff_t off;
 106         ENTRY;
 107
 108         /* if the export has already been failed, we have no last_rcvd slot */
 109         if (req->rq_export->exp_failed) {
 110                 CERROR("committing transaction for disconnected client\n");
 111                 if (handle)
 112                         GOTO(out_commit, rc);
 113                 RETURN(rc);
 114         }
 115
 116         if (IS_ERR(handle))
 117                 RETURN(rc);
 118
 119         if (handle == NULL) {
 120                 /* if we're starting our own xaction, use our own inode */
 121                 inode = mds->mds_rcvd_filp->f_dentry->d_inode;
 122                 handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
 123                 if (IS_ERR(handle)) {
 124                         CERROR("fsfilt_start: %ld\n", PTR_ERR(handle));
 125                         RETURN(PTR_ERR(handle));
 126                 }
 127         }
 128
 129         off = med->med_off;
 130
 131         transno = req->rq_reqmsg->transno;
 132         if (rc != 0) {
 133                 LASSERTF(transno == 0, "BUG 3934, t"LPU64" rc %d\n", transno, rc);
 134         } else if (transno == 0) {
 135                 spin_lock(&mds->mds_transno_lock);
 136                 transno = ++mds->mds_last_transno;
 137                 spin_unlock(&mds->mds_transno_lock);
 138         } else {
 139                 spin_lock(&mds->mds_transno_lock);
 140                 if (transno > mds->mds_last_transno)
 141                         mds->mds_last_transno = transno;
 142                 spin_unlock(&mds->mds_transno_lock);
 143         }
 144         req->rq_repmsg->transno = req->rq_transno = transno;
 145         if (req->rq_reqmsg->opc == MDS_CLOSE) {
 146                 mcd->mcd_last_close_transno = cpu_to_le64(transno);
 147                 mcd->mcd_last_close_xid = cpu_to_le64(req->rq_xid);
 148                 mcd->mcd_last_close_result = cpu_to_le32(rc);
 149                 mcd->mcd_last_close_data = cpu_to_le32(op_data);
 150         } else {
 151                 mcd->mcd_last_transno = cpu_to_le64(transno);
 152                 mcd->mcd_last_xid = cpu_to_le64(req->rq_xid);
 153                 mcd->mcd_last_result = cpu_to_le32(rc);
 154                 mcd->mcd_last_data = cpu_to_le32(op_data);
 155         }
 156
 157         fsfilt_add_journal_cb(obd, mds->mds_sb, transno, handle,
 158                               mds_commit_last_transno_cb, NULL);
 159
 160         err = fsfilt_write_record(obd, mds->mds_rcvd_filp, mcd,
 161                                   sizeof(*mcd), &off, 0);
 162
 163         if (err) {
 164                 log_pri = D_ERROR;
 165                 if (rc == 0)
 166                         rc = err;
 167         }
 168
 169         DEBUG_REQ(log_pri, req,
 170                   "wrote trans #"LPU64" client %s at idx %u: err = %d",
 171                   transno, mcd->mcd_uuid, med->med_idx, err);
 172
 173         err = mds_update_last_fid(obd, handle, 0);
 174         if (err) {
 175                 log_pri = D_ERROR;
 176                 if (rc == 0)
 177                         rc = err;
 178         }
 179
 180         err = mds_dt_write_objids(obd);
 181         if (err) {
 182                 log_pri = D_ERROR;
 183                 if (rc == 0)
 184                         rc = err;
 185         }
 186         CDEBUG(log_pri, "wrote objids: err = %d\n", err);
 187
 188         EXIT;
 189 out_commit:
 190         err = fsfilt_commit(obd, mds->mds_sb, inode, handle,
 191                             req->rq_export->exp_sync);
 192         if (err) {
 193                 CERROR("error committing transaction: %d\n", err);
 194                 if (!rc)
 195                         rc = err;
 196         }
 197
 198         return rc;
 199 }
 200
 201 /* this gives the same functionality as the code between
 202  * sys_chmod and inode_setattr
 203  * chown_common and inode_setattr
 204  * utimes and inode_setattr
 205  */
 206 #ifndef ATTR_RAW
 207 /* Just for the case if we have some clients that know about ATTR_RAW */
 208 #define ATTR_RAW 8192
 209 #endif
 210 int mds_fix_attr(struct inode *inode, struct mds_update_record *rec)
 211 {
 212         time_t now = LTIME_S(CURRENT_TIME);
 213         struct iattr *attr = &rec->ur_iattr;
 214         unsigned int ia_valid = attr->ia_valid;
 215         int error;
 216         ENTRY;
 217
 218         /* only fix up attrs if the client VFS didn't already */
 219
 220         if (!(ia_valid & ATTR_RAW))
 221                 RETURN(0);
 222
 223         if (!(ia_valid & ATTR_CTIME_SET))
 224                 LTIME_S(attr->ia_ctime) = now;
 225         if (!(ia_valid & ATTR_ATIME_SET))
 226                 LTIME_S(attr->ia_atime) = now;
 227         if (!(ia_valid & ATTR_MTIME_SET))
 228                 LTIME_S(attr->ia_mtime) = now;
 229
 230         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 231                 RETURN(-EPERM);
 232
 233         /* times */
 234         if ((ia_valid & (ATTR_MTIME|ATTR_ATIME)) == (ATTR_MTIME|ATTR_ATIME)) {
 235                 if (rec->ur_fsuid != inode->i_uid &&
 236                     (error = ll_permission(inode, MAY_WRITE, NULL)) != 0)
 237                         RETURN(error);
 238         }
 239
 240         if (ia_valid & ATTR_SIZE) {
 241                 if ((error = ll_permission(inode, MAY_WRITE, NULL)) != 0)
 242                         RETURN(error);
 243         }
 244
 245         if (ia_valid & ATTR_UID) {
 246                 /* chown */
 247                 error = -EPERM;
 248                 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 249                         RETURN(-EPERM);
 250                 if (attr->ia_uid == (uid_t) -1)
 251                         attr->ia_uid = inode->i_uid;
 252                 if (attr->ia_gid == (gid_t) -1)
 253                         attr->ia_gid = inode->i_gid;
 254                 attr->ia_mode = inode->i_mode;
 255                 /*
 256                  * If the user or group of a non-directory has been
 257                  * changed by a non-root user, remove the setuid bit.
 258                  * 19981026 David C Niemi <niemi@tux.org>
 259                  *
 260                  * Changed this to apply to all users, including root,
 261                  * to avoid some races. This is the behavior we had in
 262                  * 2.0. The check for non-root was definitely wrong
 263                  * for 2.2 anyway, as it should have been using
 264                  * CAP_FSETID rather than fsuid -- 19990830 SD.
 265                  */
 266                 if ((inode->i_mode & S_ISUID) == S_ISUID &&
 267                     !S_ISDIR(inode->i_mode)) {
 268                         attr->ia_mode &= ~S_ISUID;
 269                         attr->ia_valid |= ATTR_MODE;
 270                 }
 271                 /*
 272                  * Likewise, if the user or group of a non-directory
 273                  * has been changed by a non-root user, remove the
 274                  * setgid bit UNLESS there is no group execute bit
 275                  * (this would be a file marked for mandatory
 276                  * locking).  19981026 David C Niemi <niemi@tux.org>
 277                  *
 278                  * Removed the fsuid check (see the comment above) --
 279                  * 19990830 SD.
 280                  */
 281                 if (((inode->i_mode & (S_ISGID | S_IXGRP)) ==
 282                      (S_ISGID | S_IXGRP)) && !S_ISDIR(inode->i_mode)) {
 283                         attr->ia_mode &= ~S_ISGID;
 284                         attr->ia_valid |= ATTR_MODE;
 285                 }
 286         } else if (ia_valid & ATTR_MODE) {
 287                 int mode = attr->ia_mode;
 288                 /* chmod */
 289                 if (attr->ia_mode == (mode_t) -1)
 290                         attr->ia_mode = inode->i_mode;
 291                 attr->ia_mode =
 292                         (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
 293         }
 294         RETURN(0);
 295 }
 296
 297 void mds_steal_ack_locks(struct ptlrpc_request *req)
 298 {
 299         struct obd_export         *exp = req->rq_export;
 300         char                       str[PTL_NALFMT_SIZE];
 301         struct list_head          *tmp;
 302         struct ptlrpc_reply_state *oldrep;
 303         struct ptlrpc_service     *svc;
 304         struct llog_create_locks  *lcl;
 305         unsigned long              flags;
 306         int                        i;
 307
 308         /* CAVEAT EMPTOR: spinlock order */
 309         spin_lock_irqsave (&exp->exp_lock, flags);
 310         list_for_each (tmp, &exp->exp_outstanding_replies) {
 311                 oldrep = list_entry(tmp, struct ptlrpc_reply_state,rs_exp_list);
 312
 313                 if (oldrep->rs_xid != req->rq_xid)
 314                         continue;
 315
 316                 if (oldrep->rs_msg->opc != req->rq_reqmsg->opc)
 317                         CERROR ("Resent req xid "LPX64" has mismatched opc: "
 318                                 "new %d old %d\n", req->rq_xid,
 319                                 req->rq_reqmsg->opc, oldrep->rs_msg->opc);
 320
 321                 svc = oldrep->rs_srv_ni->sni_service;
 322                 spin_lock (&svc->srv_lock);
 323
 324                 list_del_init (&oldrep->rs_exp_list);
 325
 326                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
 327                       " o%d NID %s\n", oldrep->rs_nlocks, oldrep,
 328                       oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_msg->opc,
 329                       ptlrpc_peernid2str(&exp->exp_connection->c_peer, str));
 330
 331                 for (i = 0; i < oldrep->rs_nlocks; i++)
 332                         ptlrpc_save_lock(req,
 333                                          &oldrep->rs_locks[i],
 334                                          oldrep->rs_modes[i]);
 335                 oldrep->rs_nlocks = 0;
 336
 337                 lcl = oldrep->rs_llog_locks;
 338                 oldrep->rs_llog_locks = NULL;
 339                 if (lcl != NULL)
 340                         ptlrpc_save_llog_lock(req, lcl);
 341
 342                 DEBUG_REQ(D_HA, req, "stole locks for");
 343                 ptlrpc_schedule_difficult_reply (oldrep);
 344
 345                 spin_unlock (&svc->srv_lock);
 346                 spin_unlock_irqrestore (&exp->exp_lock, flags);
 347                 return;
 348         }
 349         spin_unlock_irqrestore (&exp->exp_lock, flags);
 350 }
 351
 352 void mds_req_from_mcd(struct ptlrpc_request *req, struct mds_client_data *mcd)
 353 {
 354         if (req->rq_reqmsg->opc == MDS_CLOSE) {
 355                 DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
 356                           mcd->mcd_last_close_transno, mcd->mcd_last_close_result);
 357                 req->rq_repmsg->transno = req->rq_transno = mcd->mcd_last_close_transno;
 358                 req->rq_repmsg->status = req->rq_status = mcd->mcd_last_close_result;
 359         } else {
 360                 DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
 361                           mcd->mcd_last_transno, mcd->mcd_last_result);
 362                 req->rq_repmsg->transno = req->rq_transno = mcd->mcd_last_transno;
 363                 req->rq_repmsg->status = req->rq_status = mcd->mcd_last_result;
 364         }
 365
 366         mds_steal_ack_locks(req);
 367 }
 368
 369 static void reconstruct_reint_setattr(struct mds_update_record *rec,
 370                                       int offset, struct ptlrpc_request *req)
 371 {
 372         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 373         struct mds_body *body;
 374         struct dentry *de;
 375
 376         mds_req_from_mcd(req, med->med_mcd);
 377
 378         de = mds_id2dentry(req2obd(req), rec->ur_id1, NULL);
 379         if (IS_ERR(de)) {
 380                 LASSERT(PTR_ERR(de) == req->rq_status);
 381                 return;
 382         }
 383
 384         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
 385         mds_pack_inode2body(req2obd(req), body, de->d_inode, 1);
 386
 387         /* Don't return OST-specific attributes if we didn't just set them */
 388         if (rec->ur_iattr.ia_valid & ATTR_SIZE)
 389                 body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 390         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET))
 391                 body->valid |= OBD_MD_FLMTIME;
 392         if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET))
 393                 body->valid |= OBD_MD_FLATIME;
 394
 395         l_dput(de);
 396 }
 397
 398 static int mds_reint_remote_setfacl(struct obd_device *obd,
 399                                     struct mds_export_data *med,
 400                                     struct mds_update_record *rec,
 401                                     struct ptlrpc_request *req)
 402 {
 403         struct rmtacl_upcall_desc desc;
 404         struct dentry   *de;
 405         struct inode    *inode;
 406         struct mds_body *body;
 407         int              rc = 0;
 408         int              repsize[2] = { sizeof(*body), LUSTRE_ACL_SIZE_MAX };
 409         ENTRY;
 410
 411         rc = lustre_pack_reply(req, 2, repsize, NULL);
 412         if (rc)
 413                 RETURN(rc);
 414
 415         de = mds_id2dentry(obd, rec->ur_id1, NULL);
 416         if (IS_ERR(de))
 417                 GOTO(out, rc = PTR_ERR(de));
 418
 419         inode = de->d_inode;
 420         LASSERT(inode);
 421
 422         /* setxattr from remote client:
 423          */
 424         memset(&desc, 0, sizeof(desc));
 425         desc.cmd = (char *) rec->ur_ea2data;
 426         desc.cmdlen = rec->ur_ea2datalen;
 427         desc.res = lustre_msg_buf(req->rq_repmsg, 1, LUSTRE_ACL_SIZE_MAX);
 428         desc.reslen = LUSTRE_ACL_SIZE_MAX;
 429
 430         mds_do_remote_acl_upcall(&desc);
 431         if (desc.upcall_status)
 432                 GOTO(out_put, rc = desc.upcall_status);
 433
 434         if (desc.status < 0)
 435                 desc.status = -desc.status;
 436
 437         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 438         LASSERT(body);
 439
 440         /* client (lmv) will do limited checking upon replied mds_body,
 441          * we pack it as normal, but "steal" field "flags" field to store
 442          * the acl execution status.
 443          */
 444         mds_pack_inode2body(obd, body, inode, 1);
 445         body->flags = desc.status;
 446         mds_body_do_reverse_map(med, body);
 447
 448         EXIT;
 449 out_put:
 450         l_dput(de);
 451 out:
 452         req->rq_status = rc;
 453         return 0;
 454 }
 455
 456 static int mds_get_md_type(char *name)
 457 {
 458         if (!strcmp(name, XATTR_LUSTRE_MDS_LOV_EA))
 459                 RETURN(EA_LOV);
 460         if (!strcmp(name, XATTR_LUSTRE_MDS_MEA_EA))
 461                 RETURN(EA_MEA);
 462         if (!strcmp(name, XATTR_LUSTRE_MDS_SID_EA))
 463                 RETURN(EA_SID);
 464         if (!strcmp(name, XATTR_LUSTRE_MDS_PID_EA))
 465                 RETURN(EA_PID);
 466         if (!strcmp(name, XATTR_LUSTRE_MDS_KEY_EA))
 467                 RETURN(EA_KEY);
 468
 469         RETURN(0);
 470 }
 471
 472 /* In the raw-setattr case, we lock the child inode.
 473  * In the write-back case or if being called from open, the client holds a lock
 474  * already.
 475  *
 476  * We use the ATTR_FROM_OPEN flag to tell these cases apart. */
 477 static int mds_reint_setattr(struct mds_update_record *rec, int offset,
 478                              struct ptlrpc_request *req, struct lustre_handle *lh)
 479 {
 480         struct mds_obd *mds = mds_req2mds(req);
 481         struct obd_device *obd = req->rq_export->exp_obd;
 482         struct mds_export_data *med = &req->rq_export->u.eu_mds_data;
 483         struct mds_body *body;
 484         struct dentry *de = NULL;
 485         struct inode *inode = NULL;
 486         struct lustre_handle lockh[2] = {{0}, {0}};
 487         int parent_mode;
 488         void *handle = NULL;
 489         struct mds_logcancel_data *mlcd = NULL;
 490         int rc = 0, cleanup_phase = 0, err;
 491         int repcnt = 1, repsize[2] = { sizeof(*body) };
 492         int locked = 0, do_trunc = 0;
 493         ENTRY;
 494
 495         LASSERT(offset == 1);
 496
 497         DEBUG_REQ(D_INODE, req, "setattr "LPU64"/%u %x",
 498                   id_ino(rec->ur_id1), id_gen(rec->ur_id1),
 499                   rec->ur_iattr.ia_valid);
 500
 501         /* remote setfacl need special handling */
 502         if ((rec->ur_iattr.ia_valid & ATTR_EA) &&
 503             !strcmp(rec->ur_eadata, XATTR_NAME_LUSTRE_ACL)) {
 504                 return mds_reint_remote_setfacl(obd, med, rec, req);
 505         }
 506
 507         if (rec->ur_iattr.ia_valid & ATTR_SIZE) {
 508                 repsize[repcnt++] = sizeof(struct lustre_capa);
 509                 do_trunc = 1; /* XXX: ATTR_SIZE will be cleared from ia_valid */
 510         }
 511
 512         rc = lustre_pack_reply(req, repcnt, repsize, NULL);
 513         if (rc)
 514                 RETURN(rc);
 515
 516         MDS_CHECK_RESENT(req, reconstruct_reint_setattr(rec, offset, req));
 517         MD_COUNTER_INCREMENT(obd, setattr);
 518
 519         if (med->med_remote) {
 520                 if (rec->ur_iattr.ia_valid & ATTR_GID) {
 521                         CWARN("Deny chgrp from remote client\n");
 522                         GOTO(cleanup, rc = -EPERM);
 523                 }
 524                 if (rec->ur_iattr.ia_valid & ATTR_UID) {
 525                         uid_t uid;
 526
 527                         uid = mds_idmap_lookup_uid(med->med_idmap, 0,
 528                                                    rec->ur_iattr.ia_uid);
 529                         if (uid == MDS_IDMAP_NOTFOUND) {
 530                                 CWARN("Deny chown to uid %u\n",
 531                                       rec->ur_iattr.ia_uid);
 532                                 GOTO(cleanup, rc = -EPERM);
 533                         }
 534                         rec->ur_iattr.ia_uid = uid;
 535                 }
 536         }
 537
 538         if (rec->ur_iattr.ia_valid & ATTR_FROM_OPEN) {
 539                 de = mds_id2dentry(obd, rec->ur_id1, NULL);
 540                 if (IS_ERR(de))
 541                         GOTO(cleanup, rc = PTR_ERR(de));
 542         } else {
 543                 __u64 lockpart = MDS_INODELOCK_UPDATE;
 544                 if (rec->ur_iattr.ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID))
 545                         lockpart |= MDS_INODELOCK_LOOKUP;
 546                 de = mds_id2locked_dentry(obd, rec->ur_id1, NULL, LCK_PW,
 547                                           lockh, &parent_mode, NULL, 0, lockpart);
 548                 if (IS_ERR(de))
 549                         GOTO(cleanup, rc = PTR_ERR(de));
 550                 locked = 1;
 551         }
 552
 553         cleanup_phase = 1;
 554
 555         inode = de->d_inode;
 556         LASSERT(inode);
 557         if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 558             rec->ur_eadata != NULL)
 559                 down(&inode->i_sem);
 560
 561         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_SETATTR_WRITE, inode->i_sb);
 562
 563         handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
 564         if (IS_ERR(handle))
 565                 GOTO(cleanup, rc = PTR_ERR(handle));
 566
 567         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_CTIME))
 568                 CDEBUG(D_INODE, "setting mtime %lu, ctime %lu\n",
 569                        LTIME_S(rec->ur_iattr.ia_mtime),
 570                        LTIME_S(rec->ur_iattr.ia_ctime));
 571         rc = mds_fix_attr(inode, rec);
 572         if (rc)
 573                 GOTO(cleanup, rc);
 574
 575         if (rec->ur_iattr.ia_valid & ATTR_ATTR_FLAG)    /* ioctl */
 576                 rc = fsfilt_iocontrol(obd, inode, NULL, EXT3_IOC_SETFLAGS,
 577                                       (long)&rec->ur_iattr.ia_attr_flags);
 578         else                                            /* setattr */
 579                 rc = fsfilt_setattr(obd, de, handle, &rec->ur_iattr, 0);
 580
 581         if (rc == 0) {
 582                 if (rec->ur_iattr.ia_valid & ATTR_EA) {
 583                         int flags = (int) rec->ur_iattr.ia_attr_flags;
 584
 585                         rc = -EOPNOTSUPP;
 586                         if (!med->med_remote && inode->i_op &&
 587                             inode->i_op->setxattr)
 588                                 rc = inode->i_op->setxattr(
 589                                                 de, rec->ur_eadata,
 590                                                 rec->ur_ea2data,
 591                                                 rec->ur_ea2datalen,
 592                                                 flags);
 593                 } else if (rec->ur_iattr.ia_valid & ATTR_EA_RM) {
 594                         rc = -EOPNOTSUPP;
 595                         if (inode->i_op && inode->i_op->removexattr)
 596                                 rc = inode->i_op->removexattr(de,
 597                                                   rec->ur_eadata);
 598                 } else if (rec->ur_iattr.ia_valid & ATTR_EA_CMOBD) {
 599                         char *name;
 600                         int type;
 601
 602                         LASSERT(rec->ur_eadata != NULL);
 603                         LASSERT(rec->ur_ea2data != NULL);
 604                         name = rec->ur_eadata;
 605
 606                         /* XXX: tmp fix for setting LOV EA from CMOBD */
 607                         type = mds_get_md_type(name);
 608
 609                         if (type == EA_LOV) {
 610                                 CDEBUG(D_INFO, "set %s EA for cmobd\n", name);
 611
 612                                 rc = fsfilt_set_md(obd, inode, handle,
 613                                                    rec->ur_ea2data,
 614                                                    rec->ur_ea2datalen,
 615                                                    type);
 616                                 if (rc) {
 617                                         CERROR("fsfilt_set_md() failed, err %d\n",
 618                                                rc);
 619                                         GOTO(cleanup, rc);
 620                                 }
 621                         }
 622                 } else if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 623                            !((rec->ur_iattr.ia_valid & ATTR_KEY) ||
 624                              (rec->ur_iattr.ia_valid & ATTR_MAC))) {
 625
 626                         struct lov_stripe_md *lsm = NULL;
 627                         struct lov_user_md *lum = NULL;
 628
 629                         if (rec->ur_eadata != NULL) {
 630                                 rc = ll_permission(inode, MAY_WRITE, NULL);
 631                                 if (rc < 0)
 632                                         GOTO(cleanup, rc);
 633
 634                                 lum = rec->ur_eadata;
 635
 636                                 /* if lmm_stripe_size is -1 delete default
 637                                  * stripe from dir */
 638                                 if (S_ISDIR(inode->i_mode) &&
 639                                     lum->lmm_stripe_size == (typeof(lum->lmm_stripe_size))(-1)){
 640                                         rc = fsfilt_set_md(obd, inode, handle, NULL, 0, EA_LOV);
 641                                         if (rc)
 642                                                 GOTO(cleanup, rc);
 643                                 } else {
 644                                         rc = obd_iocontrol(OBD_IOC_LOV_SETSTRIPE,
 645                                                            mds->mds_dt_exp, 0,
 646                                                            &lsm, rec->ur_eadata);
 647                                         if (rc)
 648                                                 GOTO(cleanup, rc);
 649
 650                                         obd_free_memmd(mds->mds_dt_exp, &lsm);
 651                                         rc = fsfilt_set_md(obd, inode, handle, rec->ur_eadata,
 652                                                            rec->ur_eadatalen, EA_LOV);
 653                                         if (rc)
 654                                                 GOTO(cleanup, rc);
 655                                 }
 656                         }
 657                 }
 658
 659                 if ((rec->ur_iattr.ia_valid & ATTR_KEY) || (rec->ur_iattr.ia_valid & ATTR_MAC)) {
 660                         void *key;
 661                         int keylen;
 662
 663                         LASSERT(rec->ur_eadatalen || rec->ur_ea3datalen);
 664                         LASSERT(rec->ur_eadata || rec->ur_ea3data);
 665                         key = rec->ur_ea3data ? rec->ur_ea3data : rec->ur_eadata;
 666                         keylen = rec->ur_ea3datalen ? rec->ur_ea3datalen :
 667                                                      rec->ur_eadatalen;
 668                         mds_set_gskey(obd, handle, inode, key, keylen,
 669                                       rec->ur_iattr.ia_valid);
 670                 }
 671         }
 672
 673         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 674         mds_pack_inode2body(obd, body, inode, 1);
 675
 676         /* Don't return OST-specific attributes if we didn't just set them */
 677         if (rec->ur_iattr.ia_valid & ATTR_SIZE)
 678                 body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 679         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET))
 680                 body->valid |= OBD_MD_FLMTIME;
 681         if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET))
 682                 body->valid |= OBD_MD_FLATIME;
 683
 684         if (do_trunc) {
 685                 struct lustre_capa capa = {
 686                         .lc_uid   = rec->ur_uc.luc_uid,
 687                         .lc_op    = CAPA_TRUNC,
 688                         .lc_ino   = inode->i_ino,
 689                         .lc_igen  = inode->i_generation,
 690                         .lc_mdsid = mds->mds_num,
 691                 };
 692                 int offset = 1;
 693
 694                 LASSERT(capa.lc_mdsid == mds->mds_num);
 695                 rc = mds_pack_capa(obd, med, NULL, &capa, req,
 696                                    &offset, body);
 697                 if (rc < 0) {
 698                         CERROR("mds_pack_capa: rc = %d\n", rc);
 699                         RETURN(rc);
 700                 }
 701         }
 702
 703         mds_body_do_reverse_map(med, body);
 704
 705         /* The logcookie should be no use anymore, why nobody remove
 706          * following code block?
 707          */
 708         LASSERT(rec->ur_cookielen == 0);
 709         if (rc == 0 && rec->ur_cookielen && !IS_ERR(mds->mds_dt_obd)) {
 710                 OBD_ALLOC(mlcd, sizeof(*mlcd) + rec->ur_cookielen +
 711                           rec->ur_eadatalen);
 712                 if (mlcd) {
 713                         mlcd->mlcd_size = sizeof(*mlcd) + rec->ur_cookielen +
 714                                 rec->ur_eadatalen;
 715                         mlcd->mlcd_eadatalen = rec->ur_eadatalen;
 716                         mlcd->mlcd_cookielen = rec->ur_cookielen;
 717                         mlcd->mlcd_lmm = (void *)&mlcd->mlcd_cookies +
 718                                 mlcd->mlcd_cookielen;
 719                         memcpy(&mlcd->mlcd_cookies, rec->ur_logcookies,
 720                                mlcd->mlcd_cookielen);
 721                         memcpy(mlcd->mlcd_lmm, rec->ur_eadata,
 722                                mlcd->mlcd_eadatalen);
 723                 } else {
 724                         CERROR("unable to allocate log cancel data\n");
 725                 }
 726         }
 727         EXIT;
 728  cleanup:
 729         if (mlcd != NULL)
 730                 fsfilt_add_journal_cb(req->rq_export->exp_obd, mds->mds_sb, 0,
 731                                       handle, mds_cancel_cookies_cb, mlcd);
 732         err = mds_finish_transno(mds, inode, handle, req, rc, 0);
 733         switch (cleanup_phase) {
 734         case 1:
 735                 if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 736                     rec->ur_eadata != NULL)
 737                         up(&inode->i_sem);
 738                 l_dput(de);
 739                 if (locked) {
 740 #ifdef S_PDIROPS
 741                         if (lockh[1].cookie != 0)
 742                                 ldlm_lock_decref(lockh + 1, parent_mode);
 743 #endif
 744                         if (rc) {
 745                                 ldlm_lock_decref(lockh, LCK_PW);
 746                         } else {
 747                                 ptlrpc_save_lock (req, lockh, LCK_PW);
 748                         }
 749                 }
 750         case 0:
 751                 break;
 752         default:
 753                 LBUG();
 754         }
 755         if (err && !rc)
 756                 rc = err;
 757
 758         req->rq_status = rc;
 759         return 0;
 760 }
 761
 762 static void reconstruct_reint_create(struct mds_update_record *rec, int offset,
 763                                      struct ptlrpc_request *req)
 764 {
 765         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 766         struct dentry *parent, *child;
 767         struct mds_body *body;
 768         ENTRY;
 769
 770         mds_req_from_mcd(req, med->med_mcd);
 771
 772         if (req->rq_status) {
 773                 EXIT;
 774                 return;
 775         }
 776
 777         parent = mds_id2dentry(req2obd(req), rec->ur_id1, NULL);
 778         LASSERT(!IS_ERR(parent));
 779         child = ll_lookup_one_len(rec->ur_name, parent,
 780                                   rec->ur_namelen - 1);
 781         LASSERT(!IS_ERR(child));
 782         if ((child->d_flags & DCACHE_CROSS_REF)) {
 783                 LASSERTF(child->d_inode == NULL, "BUG 3869\n");
 784                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
 785                 mds_pack_dentry2body(req2obd(req), body, child, 1);
 786         } else if (child->d_inode == NULL) {
 787                 DEBUG_REQ(D_ERROR, req, "parent "DLID4" name %s mode %o",
 788                           OLID4(rec->ur_id1), rec->ur_name, rec->ur_mode);
 789                 LASSERTF(child->d_inode != NULL, "BUG 3869\n");
 790         } else {
 791                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
 792                 mds_pack_inode2body(req2obd(req), body, child->d_inode, 1);
 793         }
 794         l_dput(parent);
 795         l_dput(child);
 796         EXIT;
 797 }
 798
 799 static int mds_get_default_acl(struct inode *dir, void **pacl)
 800 {
 801         struct dentry de = { .d_inode = dir };
 802         int size, size2;
 803
 804         LASSERT(S_ISDIR(dir->i_mode));
 805
 806         if (!dir->i_op->getxattr)
 807                 return 0;
 808
 809         size = dir->i_op->getxattr(&de, XATTR_NAME_ACL_DEFAULT, NULL, 0);
 810         if (size == 0 || size == -ENODATA || size == -EOPNOTSUPP)
 811                 return 0;
 812         else if (size < 0)
 813                 return size;
 814
 815         OBD_ALLOC(*pacl, size);
 816         if (!*pacl)
 817                 return -ENOMEM;
 818
 819         size2 = dir->i_op->getxattr(&de, XATTR_NAME_ACL_DEFAULT, *pacl, size);
 820         if (size2 != size) {
 821                 /* since we already locked the dir, it should not change
 822                  * between the 2 getxattr calls
 823                  */
 824                 CERROR("2'nd getxattr got %d, expect %d\n", size2, size);
 825                 OBD_FREE(*pacl, size);
 826                 return -EIO;
 827         }
 828
 829         return size;
 830 }
 831
 832 static int mds_reint_create(struct mds_update_record *rec, int offset,
 833                             struct ptlrpc_request *req,
 834                             struct lustre_handle *lh)
 835 {
 836         struct dentry *dparent = NULL;
 837         struct mds_obd *mds = mds_req2mds(req);
 838         struct obd_device *obd = req->rq_export->exp_obd;
 839         struct mds_body *body = NULL;
 840         struct dentry *dchild = NULL;
 841         struct inode *dir = NULL;
 842         void *handle = NULL;
 843         struct lustre_handle lockh[2] = {{0}, {0}};
 844         int parent_mode;
 845         int rc = 0, err, type = rec->ur_mode & S_IFMT, cleanup_phase = 0;
 846         int created = 0;
 847         struct dentry_params dp;
 848         struct mea *mea = NULL;
 849         int mea_size;
 850         struct lustre_id sid;
 851         __u64 fid;
 852         ENTRY;
 853
 854         LASSERT(offset == 1);
 855
 856         LASSERT(!strcmp(req->rq_export->exp_obd->obd_type->typ_name,
 857                         OBD_MDS_DEVICENAME));
 858
 859         DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u name %s mode %o",
 860                   id_ino(rec->ur_id1), id_gen(rec->ur_id1),
 861                   rec->ur_name, rec->ur_mode);
 862
 863         MDS_CHECK_RESENT(req, reconstruct_reint_create(rec, offset, req));
 864
 865         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_CREATE))
 866                 GOTO(cleanup, rc = -ESTALE);
 867
 868         dparent = mds_id2locked_dentry(obd, rec->ur_id1, NULL, LCK_PW,
 869                                        lockh, &parent_mode, rec->ur_name,
 870                                        rec->ur_namelen - 1, MDS_INODELOCK_UPDATE);
 871         if (IS_ERR(dparent)) {
 872                 rc = PTR_ERR(dparent);
 873                 CERROR("parent lookup error %d, id "DLID4"\n",
 874                        rc, OLID4(rec->ur_id1));
 875                 GOTO(cleanup, rc);
 876         }
 877         cleanup_phase = 1; /* locked parent dentry */
 878         dir = dparent->d_inode;
 879         LASSERT(dir);
 880
 881         ldlm_lock_dump_handle(D_OTHER, lockh);
 882
 883         /* get parent id: ldlm lock on the parent protects ea */
 884         rc = mds_read_inode_sid(obd, dir, &sid);
 885         if (rc) {
 886                 CERROR("can't read parent id. ino(%lu) rc(%d)\n",
 887                        dir->i_ino, rc);
 888                 GOTO(cleanup, rc);
 889         }
 890
 891         /* try to retrieve MEA data for this dir */
 892         rc = mds_md_get_attr(obd, dparent->d_inode, &mea, &mea_size);
 893         if (rc)
 894                 GOTO(cleanup, rc);
 895
 896         if (mea != NULL && mea->mea_count) {
 897                 /*
 898                  * dir is already splitted, check is requested filename should
 899                  * live at this MDS or at another one.
 900                  */
 901                 int i = mea_name2idx(mea, rec->ur_name, rec->ur_namelen - 1);
 902                 if (mea->mea_master != id_group(&mea->mea_ids[i])) {
 903                         CDEBUG(D_OTHER, "inapropriate MDS(%d) for %lu/%u:%s."
 904                                " should be %lu(%d)\n",
 905                                mea->mea_master, dparent->d_inode->i_ino,
 906                                dparent->d_inode->i_generation, rec->ur_name,
 907                                (unsigned long)id_group(&mea->mea_ids[i]), i);
 908                         GOTO(cleanup, rc = -ERESTART);
 909                 }
 910         }
 911
 912         dchild = ll_lookup_one_len(rec->ur_name, dparent,
 913                                    rec->ur_namelen - 1);
 914         if (IS_ERR(dchild)) {
 915                 rc = PTR_ERR(dchild);
 916                 CERROR("Can't find "DLID4"/%s, error %d\n",
 917                        OLID4(rec->ur_id1), rec->ur_name, rc);
 918                 GOTO(cleanup, rc);
 919         }
 920
 921         cleanup_phase = 2; /* child dentry */
 922
 923         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_CREATE_WRITE, dir->i_sb);
 924
 925         if (type == S_IFREG || type == S_IFDIR) {
 926                 rc = mds_try_to_split_dir(obd, dparent, &mea, 0, parent_mode);
 927                 CDEBUG(D_OTHER, "%s: splitted %lu/%u - %d/%d\n",
 928                        obd->obd_name, dparent->d_inode->i_ino,
 929                        dparent->d_inode->i_generation, rc, parent_mode);
 930                 if (rc > 0) {
 931                         /* dir got splitted */
 932                         GOTO(cleanup, rc = -ERESTART);
 933                 } else if (rc < 0) {
 934                         /* error happened during spitting. */
 935                         GOTO(cleanup, rc);
 936                 }
 937         }
 938
 939         if (dir->i_mode & S_ISGID) {
 940                 if (S_ISDIR(rec->ur_mode))
 941                         rec->ur_mode |= S_ISGID;
 942         }
 943
 944         /* for reint case stor ecookie should be zero */
 945         if (rec->ur_flags & MDS_REINT_REQ) {
 946                 LASSERT(id_ino(rec->ur_id1) == 0);
 947                 LASSERT(id_ino(rec->ur_id2) == 0);
 948         }
 949
 950         if (id_fid(rec->ur_id2))
 951                 fid = id_fid(rec->ur_id2);
 952         else
 953                 fid = mds_alloc_fid(obd);
 954
 955         dchild->d_fsdata = (void *)&dp;
 956         dp.p_inum = (unsigned long)id_ino(rec->ur_id2);
 957         dp.p_ptr = req;
 958
 959         dp.p_fid = fid;
 960         dp.p_group = mds->mds_num;
 961
 962         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
 963
 964         switch (type) {
 965         case S_IFREG: {
 966                 handle = fsfilt_start(obd, dir, FSFILT_OP_CREATE, NULL);
 967                 if (IS_ERR(handle))
 968                         GOTO(cleanup, rc = PTR_ERR(handle));
 969                 rc = ll_vfs_create(dir, dchild, rec->ur_mode, NULL);
 970
 971                 /* XXX: here we should check what type of EA is in ur_eadata
 972                  * and do appropriate actions. --umka */
 973                 if (rec->ur_eadata && rec->ur_eadatalen &&
 974                     rc == 0 && dchild->d_inode != NULL) {
 975                     if (rec->ur_flags & MDS_REINT_REQ) {
 976                         /* for CMOBD to set lov md info when cmobd reint
 977                          * create */
 978                         CDEBUG(D_INFO, "set lsm %p, len %d to inode %lu \n",
 979                                rec->ur_eadata, rec->ur_eadatalen,
 980                                dchild->d_inode->i_ino);
 981                         rc = fsfilt_set_md(obd, dchild->d_inode, handle,
 982                                            rec->ur_eadata, rec->ur_eadatalen,
 983                                            EA_LOV);
 984                         if (rc) {
 985                                 CERROR("fsfilt_set_md() failed, err %d\n",
 986                                        rc);
 987                                 GOTO(cleanup, rc);
 988                         }
 989                     } else {
 990                         /* assumption: when ur_eadata is not NULL,
 991                          * ur_eadata is crypto key, should fix it later,
 992                          * --wangdi */
 993                         rc = mds_set_gskey(obd, handle, dchild->d_inode,
 994                                            rec->ur_eadata, rec->ur_eadatalen,
 995                                            ATTR_MAC | ATTR_KEY);
 996                         if (rc) {
 997                                 CWARN("mds_set_gskey() failed, err %d\n",
 998                                       rc);
 999                         }
1000                     }
1001                 }
1002                 break;
1003         }
1004         case S_IFDIR: {
1005                 int i;
1006
1007                 /*
1008                  * as Peter asked, mkdir() should distribute new directories
1009                  * over the whole cluster in order to distribute namespace
1010                  * processing load. first, we calculate which MDS to use to put
1011                  * new directory's inode in.
1012                  */
1013
1014                 /* XXX: here we order mds_choose_mdsnum() to use local mdsnum
1015                  * for reint requests. This should be gone when real flushing on
1016                  * LMV is fixed. --umka */
1017                 i = mds_choose_mdsnum(obd, rec->ur_name, rec->ur_namelen - 1,
1018                                       rec->ur_flags, &req->rq_peer, dir,
1019                                       (rec->ur_flags & MDS_REINT_REQ) ? 1 : 0);
1020
1021                 if (i == mds->mds_num) {
1022                         /* inode will be created locally */
1023                         handle = fsfilt_start(obd, dir, FSFILT_OP_MKDIR, NULL);
1024                         if (IS_ERR(handle))
1025                                 GOTO(cleanup, rc = PTR_ERR(handle));
1026
1027                         rc = vfs_mkdir(dir, dchild, rec->ur_mode);
1028                         if (rc) {
1029                                 CDEBUG(D_OTHER,
1030                                        "Can't create dir \"%s\", rc = %d\n",
1031                                        dchild->d_name.name, rc);
1032                                 GOTO(cleanup, rc);
1033                         }
1034
1035                 } else if (!DENTRY_VALID(dchild)) {
1036                         /* inode will be created on another MDS */
1037                         struct obdo *oa = NULL;
1038                         void *acl = NULL;
1039                         int acl_size;
1040
1041                         /* first, create that inode */
1042                         oa = obdo_alloc();
1043                         if (!oa)
1044                                 GOTO(cleanup, rc = -ENOMEM);
1045
1046                         oa->o_mds = i;
1047                         oa->o_easize = 0;
1048
1049                         if (rec->ur_eadata) {
1050                                 /* user asks for creating splitted dir */
1051                                 oa->o_easize = *((u16 *) rec->ur_eadata);
1052                         }
1053
1054                         obdo_from_inode(oa, dir, OBD_MD_FLATIME |
1055                                         OBD_MD_FLMTIME | OBD_MD_FLCTIME);
1056
1057                         /* adjust the uid/gid/mode bits */
1058                         oa->o_mode = rec->ur_mode;
1059                         oa->o_uid = current->fsuid;
1060                         oa->o_gid = (dir->i_mode & S_ISGID) ?
1061                                      dir->i_gid : current->fsgid;
1062
1063                         /* letting remote MDS know that this is reint
1064                          * request. */
1065                         if (rec->ur_flags & MDS_REINT_REQ)
1066                                 oa->o_flags |= OBD_FL_REINT;
1067
1068                         /* transfer parent id to remote inode */
1069                         memcpy(obdo_id(oa), &sid, sizeof(sid));
1070                         oa->o_valid |= OBD_MD_FLTYPE | OBD_MD_FLUID |
1071                                        OBD_MD_FLGID | OBD_MD_FLIFID;
1072
1073                         CDEBUG(D_OTHER, "%s: create dir on MDS %u\n",
1074                                obd->obd_name, i);
1075
1076                         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1077                                 /*
1078                                  * here inode number and generation are
1079                                  * important, as this is replay request and we
1080                                  * need them to check if such an object is
1081                                  * already created.
1082                                  */
1083                                 CDEBUG(D_HA, "%s: replay dir creation %*s -> %u/%u\n",
1084                                        obd->obd_name, rec->ur_namelen - 1,
1085                                        rec->ur_name, (unsigned)id_ino(rec->ur_id2),
1086                                        (unsigned)id_gen(rec->ur_id2));
1087                                 oa->o_id = id_ino(rec->ur_id2);
1088                                 oa->o_fid = id_fid(rec->ur_id2);
1089                                 oa->o_generation = id_gen(rec->ur_id2);
1090                                 oa->o_flags |= OBD_FL_RECREATE_OBJS;
1091                                 LASSERT(oa->o_fid != 0);
1092                         }
1093
1094                         /* obtain default ACL */
1095                         acl_size = mds_get_default_acl(dir, &acl);
1096                         if (acl_size < 0) {
1097                                 obdo_free(oa);
1098                                 GOTO(cleanup, rc = -ENOMEM);
1099                         }
1100
1101                         /*
1102                          * before obd_create() is called, o_fid is not known if
1103                          * this is not recovery of cause.
1104                          */
1105                         rc = obd_create(mds->mds_md_exp, oa, acl, acl_size,
1106                                         NULL, NULL);
1107
1108                         if (acl)
1109                                 OBD_FREE(acl, acl_size);
1110
1111                         if (rc) {
1112                                 CERROR("can't create remote inode: %d\n", rc);
1113                                 DEBUG_REQ(D_ERROR, req, "parent "LPU64"/%u name %s mode %o",
1114                                           id_ino(rec->ur_id1), id_gen(rec->ur_id1),
1115                                           rec->ur_name, rec->ur_mode);
1116                                 obdo_free(oa);
1117                                 GOTO(cleanup, rc);
1118                         }
1119
1120                         LASSERT(oa->o_fid != 0);
1121
1122                         /* now, add new dir entry for it */
1123                         handle = fsfilt_start(obd, dir, FSFILT_OP_MKDIR, NULL);
1124                         if (IS_ERR(handle)) {
1125                                 obdo_free(oa);
1126                                 GOTO(cleanup, rc = PTR_ERR(handle));
1127                         }
1128
1129                         /* creating local dentry for remote inode. */
1130                         rc = fsfilt_add_dir_entry(obd, dparent, rec->ur_name,
1131                                                   rec->ur_namelen - 1, oa->o_id,
1132                                                   oa->o_generation, i, oa->o_fid);
1133
1134                         if (rc) {
1135                                 CERROR("Can't create local entry %*s for "
1136                                        "remote inode.\n", rec->ur_namelen - 1,
1137                                         rec->ur_name);
1138                                 GOTO(cleanup, rc);
1139                         }
1140
1141                         /* fill reply */
1142                         body->valid |= OBD_MD_FLID | OBD_MD_MDS | OBD_MD_FID;
1143
1144                         obdo2id(&body->id1, oa);
1145                         obdo_free(oa);
1146                 } else {
1147                         /* requested name exists in the directory */
1148                         rc = -EEXIST;
1149                 }
1150                 break;
1151         }
1152         case S_IFLNK:{
1153                 handle = fsfilt_start(obd, dir, FSFILT_OP_SYMLINK, NULL);
1154                 if (IS_ERR(handle))
1155                         GOTO(cleanup, rc = PTR_ERR(handle));
1156                 if (rec->ur_tgt == NULL)        /* no target supplied */
1157                         rc = -EINVAL;           /* -EPROTO? */
1158                 else
1159                         rc = ll_vfs_symlink(dir, dchild, rec->ur_tgt, S_IALLUGO);
1160                 break;
1161         }
1162         case S_IFCHR:
1163         case S_IFBLK:
1164         case S_IFIFO:
1165         case S_IFSOCK:{
1166                 int rdev = rec->ur_rdev;
1167                 handle = fsfilt_start(obd, dir, FSFILT_OP_MKNOD, NULL);
1168                 if (IS_ERR(handle))
1169                         GOTO(cleanup, (handle = NULL, rc = PTR_ERR(handle)));
1170                 rc = vfs_mknod(dir, dchild, rec->ur_mode, rdev);
1171                 break;
1172         }
1173         default:
1174                 CERROR("bad file type %o creating %s\n", type, rec->ur_name);
1175                 dchild->d_fsdata = NULL;
1176                 GOTO(cleanup, rc = -EINVAL);
1177         }
1178
1179         /* In case we stored the desired inum in here, we want to clean up. */
1180         if (dchild->d_fsdata == (void *)(unsigned long)id_ino(rec->ur_id2))
1181                 dchild->d_fsdata = NULL;
1182
1183         if (rc) {
1184                 CDEBUG(D_INODE, "error during create: %d\n", rc);
1185                 GOTO(cleanup, rc);
1186         } else if (dchild->d_inode) {
1187                 struct mds_export_data *med = &req->rq_export->u.eu_mds_data;
1188                 struct inode *inode = dchild->d_inode;
1189                 struct iattr iattr;
1190
1191                 created = 1;
1192                 iattr.ia_uid = rec->ur_fsuid;
1193                 LTIME_S(iattr.ia_atime) = rec->ur_time;
1194                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
1195                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
1196
1197                 if (dir->i_mode & S_ISGID)
1198                         iattr.ia_gid = dir->i_gid;
1199                 else
1200                         iattr.ia_gid = rec->ur_fsgid;
1201
1202                 iattr.ia_valid = ATTR_UID | ATTR_GID | ATTR_ATIME |
1203                         ATTR_MTIME | ATTR_CTIME;
1204
1205                 if (id_ino(rec->ur_id2)) {
1206                         LASSERT(id_ino(rec->ur_id2) == inode->i_ino);
1207                         inode->i_generation = id_gen(rec->ur_id2);
1208                         /* dirtied and committed by the upcoming setattr. */
1209                         CDEBUG(D_INODE, "recreated ino %lu with gen %u\n",
1210                                inode->i_ino, inode->i_generation);
1211                 }
1212                 mds_inode2id(obd, &body->id1, dchild->d_inode, fid);
1213                 mds_update_inode_ids(obd, inode, handle, &body->id1, &sid);
1214
1215                 rc = fsfilt_setattr(obd, dchild, handle, &iattr, 0);
1216                 if (rc)
1217                         CERROR("error on child setattr: rc = %d\n", rc);
1218
1219                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
1220                 rc = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
1221                 if (rc)
1222                         CERROR("error on parent setattr: rc = %d\n", rc);
1223                 else
1224                         MD_COUNTER_INCREMENT(obd, create);
1225
1226                 /* take care of default stripe inheritance */
1227                 if (type == S_IFDIR) {
1228                         struct lov_mds_md lmm;
1229                         int lmm_size = sizeof(lmm), nstripes = 0;
1230
1231                         rc = mds_get_md(obd, dir, &lmm, &lmm_size, 1, 0);
1232                         if (rc > 0) {
1233                                 down(&inode->i_sem);
1234                                 rc = fsfilt_set_md(obd, inode, handle,
1235                                                    &lmm, lmm_size, EA_LOV);
1236                                 up(&inode->i_sem);
1237                         }
1238                         if (rc) {
1239                                 CERROR("error on copy stripe info: rc = %d\n",
1240                                        rc);
1241                                 rc = 0;
1242                         }
1243
1244                         if (rec->ur_eadata)
1245                                 nstripes = *(u16 *)rec->ur_eadata;
1246
1247                         if (nstripes) {
1248                                 /*
1249                                  * we pass LCK_EX to split routine to signal,
1250                                  * that we have exclusive access to the
1251                                  * directory. Simple because nobody knows it
1252                                  * already exists -bzzz
1253                                  */
1254                                 rc = mds_try_to_split_dir(obd, dchild,
1255                                                           NULL, nstripes,
1256                                                           LCK_EX);
1257                                 if (rc > 0) {
1258                                         /* dir got splitted */
1259                                         rc = 0;
1260                                 } else if (rc < 0) {
1261                                         /* an error occured during
1262                                          * splitting. */
1263                                         GOTO(cleanup, rc);
1264                                 }
1265                         }
1266
1267                 }
1268
1269                 mds_pack_inode2body(obd, body, inode, 1);
1270                 mds_body_do_reverse_map(med, body);
1271
1272                 if (rec->ur_flags & MDS_REINT_REQ) {
1273                         LASSERT(body != NULL);
1274                         rc = mds_fidmap_add(obd, &body->id1);
1275                         if (rc < 0) {
1276                                 CERROR("can't create fid->ino mapping, "
1277                                        "err %d\n", rc);
1278                         } else {
1279                                 rc = 0;
1280                         }
1281                 }
1282         }
1283
1284         EXIT;
1285 cleanup:
1286         err = mds_finish_transno(mds, dir, handle, req, rc, 0);
1287
1288         if (rc && created) {
1289                 /* Destroy the file we just created. This should not need extra
1290                  * journal credits, as we have already modified all of the
1291                  * blocks needed in order to create the file in the first
1292                  * place. */
1293                 switch (type) {
1294                 case S_IFDIR:
1295                         err = vfs_rmdir(dir, dchild);
1296                         if (err)
1297                                 CERROR("rmdir in error path: %d\n", err);
1298                         break;
1299                 default:
1300                         err = vfs_unlink(dir, dchild);
1301                         if (err)
1302                                 CERROR("unlink in error path: %d\n", err);
1303                         break;
1304                 }
1305         } else if (created) {
1306                 /* The inode we were allocated may have just been freed
1307                  * by an unlink operation.  We take this lock to
1308                  * synchronize against the matching reply-ack-lock taken
1309                  * in unlink, to avoid replay problems if this reply
1310                  * makes it out to the client but the unlink's does not.
1311                  * See bug 2029 for more detail.*/
1312                 mds_lock_new_child(obd, dchild->d_inode, NULL);
1313         } else {
1314                 rc = err;
1315         }
1316         switch (cleanup_phase) {
1317         case 2: /* child dentry */
1318                 if (rc == -EACCES)
1319                         mds_audit(req, dchild, rec->ur_name,
1320                                   rec->ur_namelen - 1, AUDIT_CREATE, rc);
1321                 l_dput(dchild);
1322         case 1: /* locked parent dentry */
1323 #ifdef S_PDIROPS
1324                 if (lockh[1].cookie != 0)
1325                         ldlm_lock_decref(lockh + 1, parent_mode);
1326 #endif
1327                 if (rc) {
1328                         ldlm_lock_decref(lockh, LCK_PW);
1329                 } else {
1330                         ptlrpc_save_lock(req, lockh, LCK_PW);
1331                 }
1332                 l_dput(dparent);
1333         case 0:
1334                 break;
1335         default:
1336                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1337                 LBUG();
1338         }
1339         if (mea)
1340                 OBD_FREE(mea, mea_size);
1341         req->rq_status = rc;
1342         return 0;
1343 }
1344
1345 static inline int
1346 res_gt(struct ldlm_res_id *res1, struct ldlm_res_id *res2,
1347        ldlm_policy_data_t *p1, ldlm_policy_data_t *p2)
1348 {
1349         int i;
1350
1351         for (i = 0; i < RES_NAME_SIZE; i++) {
1352                 /*
1353                  * this is needed to make zeroed res_id entries to be put at the
1354                  * end of list in *ordered_locks() .
1355                  */
1356                 if (res1->name[i] == 0 && res2->name[i] != 0)
1357                         return 1;
1358                 if (res2->name[i] == 0 && res1->name[i] != 0)
1359                         return 0;
1360                 if (res1->name[i] > res2->name[i])
1361                         return 1;
1362                 if (res1->name[i] < res2->name[i])
1363                         return 0;
1364         }
1365
1366         if (!p1 || !p2)
1367                 return 0;
1368
1369         if (memcmp(p1, p2, sizeof(*p1)) < 0)
1370                 return 1;
1371
1372         return 0;
1373 }
1374
1375 /* This function doesn't use ldlm_match_or_enqueue because we're always called
1376  * with EX or PW locks, and the MDS is no longer allowed to match write locks,
1377  * because they take the place of local semaphores.
1378  *
1379  * One or two locks are taken in numerical order.  A res_id->name[0] of 0 means
1380  * no lock is taken for that res_id.  Must be at least one non-zero res_id. */
1381 int enqueue_ordered_locks(struct obd_device *obd, struct ldlm_res_id *p1_res_id,
1382                           struct lustre_handle *p1_lockh, int p1_lock_mode,
1383                           ldlm_policy_data_t *p1_policy,
1384                           struct ldlm_res_id *p2_res_id,
1385                           struct lustre_handle *p2_lockh, int p2_lock_mode,
1386                           ldlm_policy_data_t *p2_policy)
1387 {
1388         int lock_modes[2] = { p1_lock_mode, p2_lock_mode };
1389         struct ldlm_res_id *res_id[2] = { p1_res_id, p2_res_id };
1390         struct lustre_handle *handles[2] = { p1_lockh, p2_lockh };
1391         ldlm_policy_data_t *policies[2] = { p1_policy, p2_policy };
1392         int rc, flags;
1393         ENTRY;
1394
1395         LASSERT(p1_res_id != NULL && p2_res_id != NULL);
1396
1397         CDEBUG(D_INFO, "locks before: "LPU64"/"LPU64"\n",
1398                res_id[0]->name[0], res_id[1]->name[0]);
1399
1400         if (res_gt(p1_res_id, p2_res_id, p1_policy, p2_policy)) {
1401                 handles[1] = p1_lockh;
1402                 handles[0] = p2_lockh;
1403                 res_id[1] = p1_res_id;
1404                 res_id[0] = p2_res_id;
1405                 lock_modes[1] = p1_lock_mode;
1406                 lock_modes[0] = p2_lock_mode;
1407                 policies[1] = p1_policy;
1408                 policies[0] = p2_policy;
1409         }
1410
1411         CDEBUG(D_DLMTRACE, "lock order: "LPU64"/"LPU64"\n",
1412                res_id[0]->name[0], res_id[1]->name[0]);
1413
1414         flags = LDLM_FL_LOCAL_ONLY | LDLM_FL_ATOMIC_CB;
1415         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, *res_id[0],
1416                               LDLM_IBITS, policies[0], lock_modes[0], &flags,
1417                               mds_blocking_ast, ldlm_completion_ast, NULL, NULL,
1418                               NULL, 0, NULL, handles[0]);
1419         if (rc != ELDLM_OK)
1420                 RETURN(-EIO);
1421         ldlm_lock_dump_handle(D_OTHER, handles[0]);
1422
1423         if (!memcmp(res_id[0], res_id[1], sizeof(*res_id[0])) &&
1424             (policies[0]->l_inodebits.bits & policies[1]->l_inodebits.bits)) {
1425                 memcpy(handles[1], handles[0], sizeof(*(handles[1])));
1426                 ldlm_lock_addref(handles[1], lock_modes[1]);
1427         } else if (res_id[1]->name[0] != 0) {
1428                 flags = LDLM_FL_LOCAL_ONLY | LDLM_FL_ATOMIC_CB;
1429                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1430                                       *res_id[1], LDLM_IBITS, policies[1],
1431                                       lock_modes[1], &flags, mds_blocking_ast,
1432                                       ldlm_completion_ast, NULL, NULL, NULL, 0,
1433                                       NULL, handles[1]);
1434                 if (rc != ELDLM_OK) {
1435                         ldlm_lock_decref(handles[0], lock_modes[0]);
1436                         RETURN(-EIO);
1437                 }
1438                 ldlm_lock_dump_handle(D_OTHER, handles[1]);
1439         }
1440
1441         RETURN(0);
1442 }
1443
1444 int enqueue_4ordered_locks(struct obd_device *obd,struct ldlm_res_id *p1_res_id,
1445                            struct lustre_handle *p1_lockh, int p1_lock_mode,
1446                            ldlm_policy_data_t *p1_policy,
1447                            struct ldlm_res_id *p2_res_id,
1448                            struct lustre_handle *p2_lockh, int p2_lock_mode,
1449                            ldlm_policy_data_t *p2_policy,
1450                            struct ldlm_res_id *c1_res_id,
1451                            struct lustre_handle *c1_lockh, int c1_lock_mode,
1452                            ldlm_policy_data_t *c1_policy,
1453                            struct ldlm_res_id *c2_res_id,
1454                            struct lustre_handle *c2_lockh, int c2_lock_mode,
1455                            ldlm_policy_data_t *c2_policy)
1456 {
1457         struct ldlm_res_id *res_id[5] = { p1_res_id, p2_res_id,
1458                                           c1_res_id, c2_res_id };
1459         struct lustre_handle *dlm_handles[5] = { p1_lockh, p2_lockh,
1460                                                  c1_lockh, c2_lockh };
1461         int lock_modes[5] = { p1_lock_mode, p2_lock_mode,
1462                               c1_lock_mode, c2_lock_mode };
1463         ldlm_policy_data_t *policies[5] = { p1_policy, p2_policy,
1464                                             c1_policy, c2_policy};
1465         int rc, i, j, sorted, flags;
1466         ENTRY;
1467
1468         CDEBUG(D_DLMTRACE, "locks before: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n",
1469                res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0],
1470                res_id[3]->name[0]);
1471
1472         /*
1473          * simple insertion sort - we have at most 4 elements. Note, that zeroed
1474          * res_id should be at the end of list after sorting is finished.
1475          */
1476         for (i = 1; i < 4; i++) {
1477                 j = i - 1;
1478                 dlm_handles[4] = dlm_handles[i];
1479                 res_id[4] = res_id[i];
1480                 lock_modes[4] = lock_modes[i];
1481                 policies[4] = policies[i];
1482
1483                 sorted = 0;
1484                 do {
1485                         if (res_gt(res_id[j], res_id[4], policies[j],
1486                                    policies[4])) {
1487                                 dlm_handles[j + 1] = dlm_handles[j];
1488                                 res_id[j + 1] = res_id[j];
1489                                 lock_modes[j + 1] = lock_modes[j];
1490                                 policies[j + 1] = policies[j];
1491                                 j--;
1492                         } else {
1493                                 sorted = 1;
1494                         }
1495                 } while (j >= 0 && !sorted);
1496
1497                 dlm_handles[j + 1] = dlm_handles[4];
1498                 res_id[j + 1] = res_id[4];
1499                 lock_modes[j + 1] = lock_modes[4];
1500                 policies[j + 1] = policies[4];
1501         }
1502
1503         CDEBUG(D_DLMTRACE, "lock order: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n",
1504                res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0],
1505                res_id[3]->name[0]);
1506
1507         /* XXX we could send ASTs on all these locks first before blocking? */
1508         for (i = 0; i < 4; i++) {
1509                 flags = LDLM_FL_ATOMIC_CB;
1510
1511                 /*
1512                  * nevertheless zeroed res_ids should be at the end of list, and
1513                  * could use break here, I think, that it is more correctly for
1514                  * clear understanding of code to have continue here, as it
1515                  * clearly means, that zeroed res_id should be skipped and does
1516                  * not mean, that if we meet zeroed res_id we should stop
1517                  * locking loop.
1518                  */
1519                 if (res_id[i]->name[0] == 0)
1520                         continue;
1521
1522                 if (i != 0 &&
1523                     !memcmp(res_id[i], res_id[i-1], sizeof(*res_id[i])) &&
1524                     (policies[i]->l_inodebits.bits &
1525                      policies[i-1]->l_inodebits.bits) ) {
1526                         memcpy(dlm_handles[i], dlm_handles[i-1],
1527                                sizeof(*(dlm_handles[i])));
1528                         ldlm_lock_addref(dlm_handles[i], lock_modes[i]);
1529                 } else {
1530                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1531                                               *res_id[i], LDLM_IBITS,
1532                                               policies[i],
1533                                               lock_modes[i], &flags,
1534                                               mds_blocking_ast,
1535                                               ldlm_completion_ast, NULL, NULL,
1536                                               NULL, 0, NULL, dlm_handles[i]);
1537                         if (rc != ELDLM_OK)
1538                                 GOTO(out_err, rc = -EIO);
1539                         ldlm_lock_dump_handle(D_OTHER, dlm_handles[i]);
1540                 }
1541         }
1542
1543         RETURN(0);
1544 out_err:
1545         while (i-- > 0)
1546                 ldlm_lock_decref(dlm_handles[i], lock_modes[i]);
1547
1548         return rc;
1549 }
1550
1551 /* In the unlikely case that the child changed while we were waiting
1552  * on the lock, we need to drop the lock on the old child and either:
1553  * - if the child has a lower resource name, then we have to also
1554  *   drop the parent lock and regain the locks in the right order
1555  * - in the rename case, if the child has a lower resource name than one of
1556  *   the other parent/child resources (maxres) we also need to reget the locks
1557  * - if the child has a higher resource name (this is the common case)
1558  *   we can just get the lock on the new child (still in lock order)
1559  *
1560  * Returns 0 if the child did not change or if it changed but could be locked.
1561  * Returns 1 if the child changed and we need to re-lock (no locks held).
1562  * Returns -ve error with a valid dchild (no locks held). */
1563 static int mds_verify_child(struct obd_device *obd,
1564                             struct ldlm_res_id *parent_res_id,
1565                             struct lustre_handle *parent_lockh,
1566                             struct dentry *dparent, int parent_mode,
1567                             struct ldlm_res_id *child_res_id,
1568                             struct lustre_handle *child_lockh,
1569                             struct dentry **dchildp, int child_mode,
1570                             ldlm_policy_data_t *child_policy,
1571                             const char *name, int namelen,
1572                             struct ldlm_res_id *maxres,
1573                             unsigned long child_ino, __u32 child_gen)
1574 {
1575         struct lustre_id sid;
1576         struct dentry *vchild, *dchild = *dchildp;
1577         int rc = 0, cleanup_phase = 2; /* parent, child locks */
1578         ENTRY;
1579
1580         vchild = ll_lookup_one_len(name, dparent, namelen - 1);
1581         if (IS_ERR(vchild))
1582                 GOTO(cleanup, rc = PTR_ERR(vchild));
1583
1584         if ((vchild->d_flags & DCACHE_CROSS_REF)) {
1585                 if (child_gen == vchild->d_generation &&
1586                     child_ino == vchild->d_inum) {
1587                         if (dchild)
1588                                 l_dput(dchild);
1589                         *dchildp = vchild;
1590                         RETURN(0);
1591                 }
1592                 goto changed;
1593         }
1594
1595         if (likely((vchild->d_inode == NULL && child_res_id->name[0] == 0) ||
1596                    (vchild->d_inode != NULL &&
1597                     child_gen == vchild->d_inode->i_generation &&
1598                     child_ino == vchild->d_inode->i_ino))) {
1599                 if (dchild)
1600                         l_dput(dchild);
1601                 *dchildp = vchild;
1602                 RETURN(0);
1603         }
1604
1605 changed:
1606         CDEBUG(D_DLMTRACE, "child inode changed: %p != %p (%lu != "LPU64")\n",
1607                vchild->d_inode, dchild ? dchild->d_inode : 0,
1608                vchild->d_inode ? vchild->d_inode->i_ino : 0,
1609                child_res_id->name[0]);
1610
1611         if (child_res_id->name[0] != 0)
1612                 ldlm_lock_decref(child_lockh, child_mode);
1613         if (dchild)
1614                 l_dput(dchild);
1615
1616         cleanup_phase = 1; /* parent lock only */
1617         *dchildp = dchild = vchild;
1618
1619         if (dchild->d_inode || (dchild->d_flags & DCACHE_CROSS_REF)) {
1620                 int flags = LDLM_FL_ATOMIC_CB;
1621
1622                 if (dchild->d_inode) {
1623                         down(&dchild->d_inode->i_sem);
1624                         rc = mds_read_inode_sid(obd, dchild->d_inode, &sid);
1625                         up(&dchild->d_inode->i_sem);
1626                         if (rc) {
1627                                 CERROR("Can't read inode self id, inode %lu,"
1628                                        " rc %d\n",  dchild->d_inode->i_ino, rc);
1629                                 GOTO(cleanup, rc);
1630                         }
1631                         child_res_id->name[0] = id_fid(&sid);
1632                         child_res_id->name[1] = id_group(&sid);
1633                 } else {
1634                         child_res_id->name[0] = dchild->d_fid;
1635                         child_res_id->name[1] = dchild->d_mdsnum;
1636                 }
1637
1638                 if (res_gt(parent_res_id, child_res_id, NULL, NULL) ||
1639                     res_gt(maxres, child_res_id, NULL, NULL)) {
1640                         CDEBUG(D_DLMTRACE, "relock "LPU64"<("LPU64"|"LPU64")\n",
1641                                child_res_id->name[0], parent_res_id->name[0],
1642                                maxres->name[0]);
1643                         GOTO(cleanup, rc = 1);
1644                 }
1645
1646                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1647                                       *child_res_id, LDLM_IBITS, child_policy,
1648                                       child_mode, &flags, mds_blocking_ast,
1649                                       ldlm_completion_ast, NULL, NULL, NULL, 0,
1650                                       NULL, child_lockh);
1651                 if (rc != ELDLM_OK)
1652                         GOTO(cleanup, rc = -EIO);
1653
1654         } else {
1655                 memset(child_res_id, 0, sizeof(*child_res_id));
1656         }
1657
1658         EXIT;
1659 cleanup:
1660         if (rc) {
1661                 switch(cleanup_phase) {
1662                 case 2:
1663                         if (child_res_id->name[0] != 0)
1664                                 ldlm_lock_decref(child_lockh, child_mode);
1665                 case 1:
1666                         ldlm_lock_decref(parent_lockh, parent_mode);
1667                 }
1668         }
1669         return rc;
1670 }
1671
1672 int mds_get_parent_child_locked(struct obd_device *obd, struct mds_obd *mds,
1673                                 struct lustre_id *id,
1674                                 struct lustre_handle *parent_lockh,
1675                                 struct dentry **dparentp, int parent_mode,
1676                                 __u64 parent_lockpart, int *update_mode,
1677                                 char *name, int namelen,
1678                                 struct lustre_handle *child_lockh,
1679                                 struct dentry **dchildp, int child_mode,
1680                                 __u64 child_lockpart)
1681 {
1682         ldlm_policy_data_t parent_policy = {.l_inodebits = { parent_lockpart }};
1683         ldlm_policy_data_t child_policy = {.l_inodebits = { child_lockpart }};
1684         struct ldlm_res_id parent_res_id = { .name = {0} };
1685         struct ldlm_res_id child_res_id = { .name = {0} };
1686         unsigned long child_ino = 0; __u32 child_gen = 0;
1687         int rc = 0, cleanup_phase = 0;
1688         struct lustre_id sid;
1689         struct inode *inode;
1690         ENTRY;
1691
1692         /* Step 1: Lookup parent */
1693         *dparentp = mds_id2dentry(obd, id, NULL);
1694         if (IS_ERR(*dparentp)) {
1695                 rc = PTR_ERR(*dparentp);
1696                 *dparentp = NULL;
1697                 RETURN(rc);
1698         }
1699
1700         CDEBUG(D_INODE, "parent ino %lu, name %s\n",
1701                (*dparentp)->d_inode->i_ino, name);
1702
1703         parent_res_id.name[0] = id_fid(id);
1704         parent_res_id.name[1] = id_group(id);
1705
1706 #ifdef S_PDIROPS
1707         parent_lockh[1].cookie = 0;
1708         if (name && IS_PDIROPS((*dparentp)->d_inode)) {
1709                 struct ldlm_res_id res_id = { .name = {0} };
1710                 ldlm_policy_data_t policy;
1711                 int flags = LDLM_FL_ATOMIC_CB;
1712
1713                 *update_mode = mds_lock_mode_for_dir(obd, *dparentp, parent_mode);
1714                 if (*update_mode) {
1715                         res_id.name[0] = id_fid(id);
1716                         res_id.name[1] = id_group(id);
1717                         policy.l_inodebits.bits = MDS_INODELOCK_UPDATE;
1718
1719                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1720                                               res_id, LDLM_IBITS, &policy,
1721                                               *update_mode, &flags,
1722                                               mds_blocking_ast,
1723                                               ldlm_completion_ast,
1724                                               NULL, NULL, NULL, 0, NULL,
1725                                               parent_lockh + 1);
1726                         if (rc != ELDLM_OK)
1727                                 RETURN(-ENOLCK);
1728                 }
1729
1730                 parent_res_id.name[2] = full_name_hash((unsigned char *)name,
1731                                                        namelen - 1);
1732
1733                 CDEBUG(D_INFO, "take lock on %lu:%lu:"LPX64"\n",
1734                        (unsigned long)id_fid(id), (unsigned long)id_group(id),
1735                        parent_res_id.name[2]);
1736         }
1737 #endif
1738
1739         cleanup_phase = 1; /* parent dentry */
1740
1741         /* Step 2: Lookup child (without DLM lock, to get resource name) */
1742         *dchildp = ll_lookup_one_len(name, *dparentp, namelen - 1);
1743         if (IS_ERR(*dchildp)) {
1744                 rc = PTR_ERR(*dchildp);
1745                 CDEBUG(D_INODE, "child lookup error %d\n", rc);
1746                 GOTO(cleanup, rc);
1747         }
1748
1749         if ((*dchildp)->d_flags & DCACHE_CROSS_REF) {
1750                 /*
1751                  * inode lives on another MDS: return * fid/mdsnum and LOOKUP
1752                  * lock. Drop possible UPDATE lock!
1753                  */
1754                 child_policy.l_inodebits.bits &= ~MDS_INODELOCK_UPDATE;
1755                 child_policy.l_inodebits.bits |= MDS_INODELOCK_LOOKUP;
1756
1757                 child_res_id.name[0] = (*dchildp)->d_fid;
1758                 child_res_id.name[1] = (*dchildp)->d_mdsnum;
1759                 child_ino = (*dchildp)->d_inum;
1760                 child_gen = (*dchildp)->d_generation;
1761                 goto retry_locks;
1762         }
1763
1764         inode = (*dchildp)->d_inode;
1765         if (inode != NULL)
1766                 inode = igrab(inode);
1767         if (inode == NULL)
1768                 goto retry_locks;
1769
1770         down(&inode->i_sem);
1771         rc = mds_read_inode_sid(obd, inode, &sid);
1772         up(&inode->i_sem);
1773         if (rc) {
1774                 CERROR("Can't read inode self id, inode %lu, "
1775                        "rc %d\n", inode->i_ino, rc);
1776                 iput(inode);
1777                 GOTO(cleanup, rc);
1778         }
1779
1780         child_ino = inode->i_ino;
1781         child_gen = inode->i_generation;
1782         child_res_id.name[0] = id_fid(&sid);
1783         child_res_id.name[1] = id_group(&sid);
1784         iput(inode);
1785
1786 retry_locks:
1787         cleanup_phase = 2; /* child dentry */
1788
1789         /* Step 3: Lock parent and child in resource order.  If child doesn't
1790          * exist, we still have to lock the parent and re-lookup. */
1791         rc = enqueue_ordered_locks(obd, &parent_res_id, parent_lockh, parent_mode,
1792                                    &parent_policy, &child_res_id, child_lockh,
1793                                    child_mode, &child_policy);
1794         if (rc)
1795                 GOTO(cleanup, rc);
1796
1797         if ((*dchildp)->d_inode || ((*dchildp)->d_flags & DCACHE_CROSS_REF))
1798                 cleanup_phase = 4; /* child lock */
1799         else
1800                 cleanup_phase = 3; /* parent lock */
1801
1802         /* Step 4: Re-lookup child to verify it hasn't changed since locking */
1803         rc = mds_verify_child(obd, &parent_res_id, parent_lockh, *dparentp,
1804                               parent_mode, &child_res_id, child_lockh,
1805                               dchildp, child_mode, &child_policy,
1806                               name, namelen, &parent_res_id, child_ino,
1807                               child_gen);
1808         if (rc > 0)
1809                 goto retry_locks;
1810         if (rc < 0) {
1811                 cleanup_phase = 3;
1812                 GOTO(cleanup, rc);
1813         }
1814
1815         EXIT;
1816 cleanup:
1817         if (rc) {
1818                 switch (cleanup_phase) {
1819                 case 4:
1820                         ldlm_lock_decref(child_lockh, child_mode);
1821                 case 3:
1822                         ldlm_lock_decref(parent_lockh, parent_mode);
1823                 case 2:
1824                         l_dput(*dchildp);
1825                 case 1:
1826 #ifdef S_PDIROPS
1827                         if (parent_lockh[1].cookie)
1828                                 ldlm_lock_decref(parent_lockh + 1, *update_mode);
1829 #endif
1830                         l_dput(*dparentp);
1831                 }
1832         }
1833         return rc;
1834 }
1835
1836 void mds_reconstruct_generic(struct ptlrpc_request *req)
1837 {
1838         struct mds_export_data *med = &req->rq_export->exp_mds_data;
1839         mds_req_from_mcd(req, med->med_mcd);
1840 }
1841
1842 /* If we are unlinking an open file/dir (i.e. creating an orphan) then we
1843  * instead link the inode into the PENDING directory until it is finally
1844  * released. We can't simply call mds_reint_rename() or some part thereof,
1845  * because we don't have the inode to check for link count/open status until
1846  * after it is locked.
1847  *
1848  * For lock ordering, caller must get child->i_sem first, then pending->i_sem
1849  * before starting journal transaction.
1850  *
1851  * returns 1 on success
1852  * returns 0 if we lost a race and didn't make a new link
1853  * returns negative on error
1854  */
1855 static int mds_orphan_add_link(struct mds_update_record *rec,
1856                                struct obd_device *obd, struct dentry *dentry)
1857 {
1858         struct mds_obd *mds = &obd->u.mds;
1859         struct inode *pending_dir = mds->mds_pending_dir->d_inode;
1860         struct inode *inode = dentry->d_inode;
1861         struct dentry *pending_child;
1862         char idname[LL_ID_NAMELEN];
1863         int idlen = 0, rc, mode;
1864         ENTRY;
1865
1866         LASSERT(inode != NULL);
1867         LASSERT(!mds_inode_is_orphan(inode));
1868 #ifndef HAVE_I_ALLOC_SEM
1869         LASSERT(down_trylock(&inode->i_sem) != 0);
1870 #endif
1871         LASSERT(down_trylock(&pending_dir->i_sem) != 0);
1872
1873         idlen = ll_id2str(idname, inode->i_ino, inode->i_generation);
1874
1875         CDEBUG(D_INODE, "pending destroy of %dx open %d linked %s %s = %s\n",
1876                mds_orphan_open_count(inode), inode->i_nlink,
1877                S_ISDIR(inode->i_mode) ? "dir" :
1878                S_ISREG(inode->i_mode) ? "file" : "other",
1879                rec->ur_name, idname);
1880
1881         if (mds_orphan_open_count(inode) == 0 || inode->i_nlink != 0)
1882                 RETURN(0);
1883
1884         pending_child = lookup_one_len(idname, mds->mds_pending_dir, idlen);
1885         if (IS_ERR(pending_child))
1886                 RETURN(PTR_ERR(pending_child));
1887
1888         if (pending_child->d_inode != NULL) {
1889                 CERROR("re-destroying orphan file %s?\n", rec->ur_name);
1890                 LASSERT(pending_child->d_inode == inode);
1891                 GOTO(out_dput, rc = 0);
1892         }
1893
1894         /*
1895          * link() is semanticaly-wrong for S_IFDIR, so we set S_IFREG for
1896          * linking and return real mode back then -bzzz
1897          */
1898         mode = inode->i_mode;
1899         inode->i_mode = S_IFREG;
1900         rc = vfs_link(dentry, pending_dir, pending_child);
1901         if (rc)
1902                 CERROR("error linking orphan %s to PENDING: rc = %d\n",
1903                        rec->ur_name, rc);
1904         else
1905                 mds_inode_set_orphan(inode);
1906
1907         /* return mode and correct i_nlink if inode is directory */
1908         inode->i_mode = mode;
1909         LASSERTF(inode->i_nlink == 1, "%s nlink == %d\n",
1910                  S_ISDIR(mode) ? "dir" : S_ISREG(mode) ? "file" : "other",
1911                  inode->i_nlink);
1912         if (S_ISDIR(mode)) {
1913                 i_nlink_inc(inode);
1914                 i_nlink_inc(pending_dir);
1915                 mark_inode_dirty(inode);
1916                 mark_inode_dirty(pending_dir);
1917         }
1918
1919         GOTO(out_dput, rc = 1);
1920 out_dput:
1921         l_dput(pending_child);
1922         return rc;
1923 }
1924
1925 int mds_create_local_dentry(struct mds_update_record *rec,
1926                             struct obd_device *obd)
1927 {
1928         struct mds_obd *mds = &obd->u.mds;
1929         struct inode *id_dir = mds->mds_id_dir->d_inode;
1930         int idlen = 0, rc, cleanup_phase = 0;
1931         struct dentry *new_child = NULL;
1932         char *idname = rec->ur_name;
1933         struct dentry *child = NULL;
1934         struct lustre_handle lockh[2] = {{0}, {0}};
1935         struct lustre_id sid;
1936         void *handle;
1937         ENTRY;
1938
1939         down(&id_dir->i_sem);
1940         idlen = ll_id2str(idname, id_ino(rec->ur_id1),
1941                           id_gen(rec->ur_id1));
1942
1943         CDEBUG(D_OTHER, "look for local dentry '%s' for "DLID4"\n",
1944                idname, OLID4(rec->ur_id1));
1945
1946         new_child = ll_lookup_one_len(idname, mds->mds_id_dir,
1947                                       idlen);
1948         up(&id_dir->i_sem);
1949         if (IS_ERR(new_child)) {
1950                 CERROR("can't lookup %s: %d\n", idname,
1951                        (int) PTR_ERR(new_child));
1952                 GOTO(cleanup, rc = PTR_ERR(new_child));
1953         }
1954         cleanup_phase = 1;
1955
1956         down(&id_dir->i_sem);
1957         rc = mds_read_inode_sid(obd, id_dir, &sid);
1958         up(&id_dir->i_sem);
1959         if (rc) {
1960                 CERROR("Can't read inode self id, inode %lu, "
1961                        "rc %d\n", id_dir->i_ino, rc);
1962                 GOTO(cleanup, rc);
1963         }
1964
1965         if (new_child->d_inode != NULL) {
1966                 /* nice. we've already have local dentry! */
1967                 CDEBUG(D_OTHER, "found dentry in FIDS/: %u/%u\n",
1968                        (unsigned)new_child->d_inode->i_ino,
1969                        (unsigned)new_child->d_inode->i_generation);
1970
1971                 id_ino(rec->ur_id1) = id_dir->i_ino;
1972                 id_gen(rec->ur_id1) = id_dir->i_generation;
1973                 rec->ur_namelen = idlen + 1;
1974
1975                 id_fid(rec->ur_id1) = id_fid(&sid);
1976                 id_group(rec->ur_id1) = id_group(&sid);
1977
1978                 GOTO(cleanup, rc = 0);
1979         }
1980
1981         /* new, local dentry will be added soon. we need no aliases here */
1982         d_drop(new_child);
1983
1984         if (rec->ur_mode & MDS_MODE_DONT_LOCK) {
1985                 child = mds_id2dentry(obd, rec->ur_id1, NULL);
1986         } else {
1987                 child = mds_id2locked_dentry(obd, rec->ur_id1, NULL,
1988                                              LCK_EX, lockh, NULL, NULL, 0,
1989                                              MDS_INODELOCK_UPDATE);
1990         }
1991
1992         if (IS_ERR(child)) {
1993                 rc = PTR_ERR(child);
1994                 if (rc != -ENOENT || !(rec->ur_mode & MDS_MODE_REPLAY))
1995                         CERROR("can't get victim: %d\n", rc);
1996                 GOTO(cleanup, rc);
1997         }
1998         cleanup_phase = 2;
1999
2000         handle = fsfilt_start(obd, id_dir, FSFILT_OP_LINK, NULL);
2001         if (IS_ERR(handle))
2002                 GOTO(cleanup, rc = PTR_ERR(handle));
2003
2004         rc = fsfilt_add_dir_entry(obd, mds->mds_id_dir, idname,
2005                                   idlen, id_ino(rec->ur_id1),
2006                                   id_gen(rec->ur_id1), mds->mds_num,
2007                                   id_fid(rec->ur_id1));
2008         if (rc)
2009                 CERROR("error linking orphan %lu/%lu to FIDS: rc = %d\n",
2010                        (unsigned long)child->d_inode->i_ino,
2011                        (unsigned long)child->d_inode->i_generation, rc);
2012         else {
2013                 if (S_ISDIR(child->d_inode->i_mode)) {
2014                         i_nlink_inc(id_dir);
2015                         mark_inode_dirty(id_dir);
2016                 }
2017                 mark_inode_dirty(child->d_inode);
2018         }
2019         fsfilt_commit(obd, mds->mds_sb, id_dir, handle, 0);
2020
2021         id_ino(rec->ur_id1) = id_dir->i_ino;
2022         id_gen(rec->ur_id1) = id_dir->i_generation;
2023         rec->ur_namelen = idlen + 1;
2024
2025         id_fid(rec->ur_id1) = id_fid(&sid);
2026         id_group(rec->ur_id1) = id_group(&sid);
2027
2028         EXIT;
2029 cleanup:
2030         switch(cleanup_phase) {
2031                 case 2:
2032                         if (!(rec->ur_mode & MDS_MODE_DONT_LOCK))
2033                                 ldlm_lock_decref(lockh, LCK_EX);
2034                         dput(child);
2035                 case 1:
2036                         dput(new_child);
2037                 case 0:
2038                        break;
2039         }
2040         return rc;
2041 }
2042
2043 static int mds_copy_unlink_reply(struct ptlrpc_request *master,
2044                                  struct ptlrpc_request *slave)
2045 {
2046         void *cookie, *cookie2;
2047         struct mds_body *body2;
2048         struct mds_body *body;
2049         void *ea, *ea2;
2050         ENTRY;
2051
2052         body = lustre_msg_buf(slave->rq_repmsg, 0, sizeof(*body));
2053         LASSERT(body != NULL);
2054
2055         body2 = lustre_msg_buf(master->rq_repmsg, 0, sizeof (*body));
2056         LASSERT(body2 != NULL);
2057
2058         if (!(body->valid & (OBD_MD_FLID | OBD_MD_FLGENER)))
2059                 RETURN(0);
2060
2061         memcpy(body2, body, sizeof(*body));
2062         body2->valid &= ~OBD_MD_FLCOOKIE;
2063
2064         if (!(body->valid & (OBD_MD_FLEASIZE | OBD_MD_FLDIREA)))
2065                 RETURN(0);
2066
2067         if (body->eadatasize == 0) {
2068                 CERROR("OBD_MD_FLEASIZE set but eadatasize zero\n");
2069                 RETURN(0);
2070         }
2071
2072         LASSERT(master->rq_repmsg->buflens[1] >= body->eadatasize);
2073
2074         ea = lustre_msg_buf(slave->rq_repmsg, 1, body->eadatasize);
2075         LASSERT(ea != NULL);
2076
2077         ea2 = lustre_msg_buf(master->rq_repmsg, 1, body->eadatasize);
2078         LASSERT(ea2 != NULL);
2079
2080         memcpy(ea2, ea, body->eadatasize);
2081
2082         if (body->valid & OBD_MD_FLCOOKIE) {
2083                 LASSERT(master->rq_repmsg->buflens[2] >=
2084                                 slave->rq_repmsg->buflens[2]);
2085                 cookie = lustre_msg_buf(slave->rq_repmsg, 2,
2086                                 slave->rq_repmsg->buflens[2]);
2087                 LASSERT(cookie != NULL);
2088
2089                 cookie2 = lustre_msg_buf(master->rq_repmsg, 2,
2090                                 master->rq_repmsg->buflens[2]);
2091                 LASSERT(cookie2 != NULL);
2092                 memcpy(cookie2, cookie, slave->rq_repmsg->buflens[2]);
2093                 body2->valid |= OBD_MD_FLCOOKIE;
2094         }
2095         RETURN(0);
2096 }
2097
2098 static int mds_reint_unlink_remote(struct mds_update_record *rec,
2099                                    int offset, struct ptlrpc_request *req,
2100                                    struct lustre_handle *parent_lockh,
2101                                    int update_mode, struct dentry *dparent,
2102                                    struct lustre_handle *child_lockh,
2103                                    struct dentry *dchild)
2104 {
2105         struct obd_device *obd = req->rq_export->exp_obd;
2106         struct mds_obd *mds = mds_req2mds(req);
2107         struct ptlrpc_request *request = NULL;
2108         int rc = 0, cleanup_phase = 0;
2109         struct mdc_op_data *op_data;
2110         void *handle;
2111         ENTRY;
2112
2113         LASSERT(offset == 1 || offset == 3);
2114
2115         /* time to drop i_nlink on remote MDS */
2116         OBD_ALLOC(op_data, sizeof(*op_data));
2117         if (op_data == NULL)
2118                 RETURN(-ENOMEM);
2119
2120         memset(op_data, 0, sizeof(*op_data));
2121         mds_pack_dentry2id(obd, &op_data->id1, dchild, 1);
2122         op_data->create_mode = rec->ur_mode;
2123
2124         DEBUG_REQ(D_INODE, req, "unlink %*s (remote inode "DLID4")",
2125                   rec->ur_namelen - 1, rec->ur_name, OLID4(&op_data->id1));
2126
2127         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
2128                 DEBUG_REQ(D_HA, req, "unlink %*s (remote inode "DLID4")",
2129                           rec->ur_namelen - 1, rec->ur_name, OLID4(&op_data->id1));
2130         }
2131
2132         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
2133                 op_data->create_mode |= MDS_MODE_REPLAY;
2134
2135         rc = md_unlink(mds->mds_md_exp, op_data, &request);
2136         cleanup_phase = 2;
2137
2138         if (request) {
2139                 if (rc == 0)
2140                         /* with MOD this is not really needed, as cookie and EA
2141                          * is not needed on client as it does not call
2142                          * OST_DESTROY anymore, MDS does it. */
2143                         mds_copy_unlink_reply(req, request);
2144                 ptlrpc_req_finished(request);
2145         }
2146
2147         if (rc == 0) {
2148                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_RMDIR,
2149                                       NULL);
2150                 if (IS_ERR(handle)) {
2151                         CERROR("can't start transaction, err %d\n",
2152                                (int)PTR_ERR(handle));
2153                         GOTO(cleanup, rc = PTR_ERR(handle));
2154                 }
2155                 rc = fsfilt_del_dir_entry(req->rq_export->exp_obd, dchild);
2156                 if (rc)
2157                         CERROR("can't remove direntry: %d\n", rc);
2158                 rc = mds_finish_transno(mds, dparent->d_inode, handle, req,
2159                                         rc, 0);
2160                 if (rc)
2161                         CERROR("can't finish transno: %d\n", rc);
2162         }
2163         EXIT;
2164 cleanup:
2165         if (rc == 0) {
2166                 struct dentry *chkdentry;
2167                 chkdentry = ll_lookup_one_len(rec->ur_name, dparent,
2168                                               rec->ur_namelen - 1);
2169                 if (!IS_ERR(chkdentry)) {
2170                         if (chkdentry->d_inode) {
2171                                 /* it was cross-ref before */
2172                                 CDEBUG(D_ERROR, "%lu/%u:%*s(%d,%x,%p) -> %lu/%u, was %p\n",
2173                                        dparent->d_inode->i_ino,
2174                                        dparent->d_inode->i_generation,
2175                                        chkdentry->d_name.len,
2176                                        chkdentry->d_name.name,
2177                                        atomic_read(&chkdentry->d_count),
2178                                        chkdentry->d_flags, chkdentry,
2179                                        chkdentry->d_inode->i_ino,
2180                                        chkdentry->d_inode->i_generation, dchild);
2181                         } else if (chkdentry->d_flags & DCACHE_CROSS_REF) {
2182                                 /* it's still in dcache? on a platter?! */
2183                                 CDEBUG(D_ERROR, "%lu/%u:%*s(%d,%x,%p) -> %u/%u, was %p\n",
2184                                        dparent->d_inode->i_ino,
2185                                        dparent->d_inode->i_generation,
2186                                        chkdentry->d_name.len,
2187                                        chkdentry->d_name.name,
2188                                        atomic_read(&chkdentry->d_count),
2189                                        chkdentry->d_flags, chkdentry,
2190                                        chkdentry->d_inum,
2191                                        chkdentry->d_generation, dchild);
2192                         } else {
2193                                 /* didn't find removed dir entry - fine! */
2194                         }
2195                         l_dput(chkdentry);
2196                 } else
2197                         CDEBUG(D_ERROR, "child lookup error %ld\n",
2198                                PTR_ERR(chkdentry));
2199         } else if (rc != -EISDIR)
2200                 CERROR("error while unlinking inode "DLID4": %d\n",
2201                        OLID4(&op_data->id1), rc);
2202         req->rq_status = rc;
2203
2204 #ifdef S_PDIROPS
2205         if (parent_lockh[1].cookie != 0)
2206                 ldlm_lock_decref(parent_lockh + 1, update_mode);
2207 #endif
2208         ldlm_lock_decref(child_lockh, LCK_EX);
2209         if (rc)
2210                 ldlm_lock_decref(parent_lockh, LCK_PW);
2211         else
2212                 ptlrpc_save_lock(req, parent_lockh, LCK_PW);
2213         l_dput(dchild);
2214         l_dput(dparent);
2215
2216         OBD_FREE(op_data, sizeof(*op_data));
2217         return 0;
2218 }
2219
2220 static int mds_reint_unlink(struct mds_update_record *rec, int offset,
2221                             struct ptlrpc_request *req, struct lustre_handle *lh)
2222 {
2223         struct dentry *dparent = NULL, *dchild;
2224         struct mds_obd *mds = mds_req2mds(req);
2225         struct obd_device *obd = req->rq_export->exp_obd;
2226         struct mds_body *body = NULL;
2227         struct inode *child_inode = NULL;
2228         struct lustre_handle parent_lockh[2] = {{0}, {0}};
2229         struct lustre_handle child_lockh = {0};
2230         struct lustre_handle child_reuse_lockh = {0};
2231         struct lustre_handle *slave_lockh = NULL;
2232         char idname[LL_ID_NAMELEN];
2233         struct llog_create_locks *lcl = NULL;
2234         void *handle = NULL;
2235         int rc = 0, cleanup_phase = 0;
2236         int unlink_by_id = 0;
2237         int update_mode;
2238         ENTRY;
2239
2240         LASSERT(offset == 1 || offset == 3);
2241
2242         DEBUG_REQ(D_INODE, req, "parent ino "LPU64"/%u, child %s",
2243                   id_ino(rec->ur_id1), id_gen(rec->ur_id1),
2244                   rec->ur_name);
2245
2246         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
2247
2248         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
2249                 DEBUG_REQ(D_HA, req, "unlink replay");
2250                 LASSERT(offset == 1); /* should not come from intent */
2251                 memcpy(lustre_msg_buf(req->rq_repmsg, 2, 0),
2252                        lustre_msg_buf(req->rq_reqmsg, offset + 2, 0),
2253                        req->rq_repmsg->buflens[2]);
2254         }
2255
2256         MD_COUNTER_INCREMENT(obd, unlink);
2257
2258         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNLINK))
2259                 GOTO(cleanup, rc = -ENOENT);
2260
2261         if (rec->ur_namelen == 1) {
2262                 /* this is request to drop i_nlink on local inode */
2263                 unlink_by_id = 1;
2264                 rec->ur_name = idname;
2265                 rc = mds_create_local_dentry(rec, obd);
2266                 if (rc == -ENOENT || (rec->ur_mode & MDS_MODE_REPLAY)) {
2267                         DEBUG_REQ(D_HA, req,
2268                                   "drop nlink on inode "DLID4" (replay)",
2269                                   OLID4(rec->ur_id1));
2270                         req->rq_status = 0;
2271                         RETURN(0);
2272                 }
2273         }
2274
2275         if (rec->ur_mode & MDS_MODE_DONT_LOCK) {
2276                 /* master mds for directory asks slave removing inode is already
2277                  * locked */
2278                 dparent = mds_id2locked_dentry(obd, rec->ur_id1, NULL,
2279                                                LCK_PW, parent_lockh,
2280                                                &update_mode, rec->ur_name,
2281                                                rec->ur_namelen,
2282                                                MDS_INODELOCK_UPDATE);
2283                 if (IS_ERR(dparent))
2284                         GOTO(cleanup, rc = PTR_ERR(dparent));
2285                 dchild = ll_lookup_one_len(rec->ur_name, dparent,
2286                                            rec->ur_namelen - 1);
2287                 if (IS_ERR(dchild))
2288                         GOTO(cleanup, rc = PTR_ERR(dchild));
2289                 child_lockh.cookie = 0;
2290                 LASSERT(!(dchild->d_flags & DCACHE_CROSS_REF));
2291                 LASSERT(dchild->d_inode != NULL);
2292                 LASSERT(S_ISDIR(dchild->d_inode->i_mode));
2293         } else {
2294                 rc = mds_get_parent_child_locked(obd, mds, rec->ur_id1,
2295                                                  parent_lockh, &dparent,
2296                                                  LCK_PW, MDS_INODELOCK_UPDATE,
2297                                                  &update_mode, rec->ur_name,
2298                                                  rec->ur_namelen, &child_lockh,
2299                                                  &dchild, LCK_EX,
2300                                                  (MDS_INODELOCK_LOOKUP |
2301                                                   MDS_INODELOCK_UPDATE));
2302         }
2303         if (rc)
2304                 GOTO(cleanup, rc);
2305
2306         if (dchild->d_flags & DCACHE_CROSS_REF) {
2307                 /* we should have parent lock only here */
2308                 LASSERT(unlink_by_id == 0);
2309                 LASSERT(dchild->d_mdsnum != mds->mds_num);
2310                 mds_reint_unlink_remote(rec, offset, req, parent_lockh,
2311                                         update_mode, dparent, &child_lockh, dchild);
2312                 RETURN(0);
2313         }
2314
2315         cleanup_phase = 1; /* dchild, dparent, locks */
2316
2317         dget(dchild);
2318         child_inode = dchild->d_inode;
2319         if (child_inode == NULL) {
2320                 CDEBUG(D_INODE, "child doesn't exist (dir %lu, name %s)\n",
2321                        dparent ? dparent->d_inode->i_ino : 0, rec->ur_name);
2322                 GOTO(cleanup, rc = -ENOENT);
2323         }
2324
2325         cleanup_phase = 2; /* dchild has a lock */
2326
2327         /* We have to do these checks ourselves, in case we are making an
2328          * orphan.  The client tells us whether rmdir() or unlink() was called,
2329          * so we need to return appropriate errors (bug 72).
2330          *
2331          * We don't have to check permissions, because vfs_rename (called from
2332          * mds_open_unlink_rename) also calls may_delete. */
2333         if ((rec->ur_mode & S_IFMT) == S_IFDIR) {
2334                 if (!S_ISDIR(child_inode->i_mode))
2335                         GOTO(cleanup, rc = -ENOTDIR);
2336         } else {
2337                 if (S_ISDIR(child_inode->i_mode))
2338                         GOTO(cleanup, rc = -EISDIR);
2339         }
2340
2341         /* handle splitted dir */
2342         rc = mds_lock_slave_objs(obd, dchild, &slave_lockh);
2343         if (rc)
2344                 GOTO(cleanup, rc);
2345
2346         /* Step 4: Get a lock on the ino to sync with creation WRT inode
2347          * reuse (see bug 2029). */
2348         rc = mds_lock_new_child(obd, child_inode, &child_reuse_lockh);
2349         if (rc != ELDLM_OK)
2350                 GOTO(cleanup, rc);
2351         cleanup_phase = 3; /* child inum lock */
2352
2353         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_UNLINK_WRITE, dparent->d_inode->i_sb);
2354
2355         /* ldlm_reply in buf[0] if called via intent */
2356         if (offset == 3)
2357                 offset = 1;
2358         else
2359                 offset = 0;
2360
2361         body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
2362         LASSERT(body != NULL);
2363
2364         /* child i_alloc_sem protects orphan_dec_test && is_orphan race */
2365         DOWN_READ_I_ALLOC_SEM(child_inode);
2366         cleanup_phase = 4; /* up(&child_inode->i_sem) when finished */
2367
2368         /* If this is potentially the last reference to this inode, get the
2369          * OBD EA data first so the client can destroy OST objects.  We
2370          * only do the object removal later if no open files/links remain. */
2371         if ((S_ISDIR(child_inode->i_mode) && child_inode->i_nlink == 2) ||
2372             child_inode->i_nlink == 1) {
2373                 if (mds_orphan_open_count(child_inode) > 0) {
2374                         /* need to lock pending_dir before transaction */
2375                         down(&mds->mds_pending_dir->d_inode->i_sem);
2376                         cleanup_phase = 5; /* up(&pending_dir->i_sem) */
2377                 } else if (S_ISREG(child_inode->i_mode)) {
2378                         mds_pack_inode2body(obd, body, child_inode, 0);
2379                         mds_pack_md(obd, req->rq_repmsg, offset + 1,
2380                                     body, child_inode, MDS_PACK_MD_LOCK, 0);
2381                 }
2382         }
2383
2384         /* Step 4: Do the unlink: we already verified ur_mode above (bug 72) */
2385         switch (child_inode->i_mode & S_IFMT) {
2386         case S_IFDIR:
2387                 /* Drop any lingering child directories before we start our
2388                  * transaction, to avoid doing multiple inode dirty/delete
2389                  * in our compound transaction (bug 1321). */
2390                 shrink_dcache_parent(dchild);
2391                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_RMDIR,
2392                                       NULL);
2393                 if (IS_ERR(handle)) {
2394                         CERROR("can't start transaction, err %d\n",
2395                                (int)PTR_ERR(handle));
2396                         GOTO(cleanup, rc = PTR_ERR(handle));
2397                 }
2398                 rc = vfs_rmdir(dparent->d_inode, dchild);
2399                 break;
2400         case S_IFREG: {
2401                 /* optimization is possible here: we could drop nlink
2402                  * w/o removing local dentry in FIDS */
2403                 struct lov_mds_md *lmm = lustre_msg_buf(req->rq_repmsg,
2404                                                         offset + 1, 0);
2405                 handle = fsfilt_start_log(obd, dparent->d_inode,
2406                                           FSFILT_OP_UNLINK, NULL,
2407                                           le32_to_cpu(lmm->lmm_stripe_count));
2408                 if (IS_ERR(handle))
2409                         GOTO(cleanup, rc = PTR_ERR(handle));
2410                 rc = vfs_unlink(dparent->d_inode, dchild);
2411                 break;
2412         }
2413         case S_IFLNK:
2414         case S_IFCHR:
2415         case S_IFBLK:
2416         case S_IFIFO:
2417         case S_IFSOCK:
2418                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK,
2419                                       NULL);
2420                 if (IS_ERR(handle))
2421                         GOTO(cleanup, rc = PTR_ERR(handle));
2422                 rc = vfs_unlink(dparent->d_inode, dchild);
2423                 break;
2424         default:
2425                 CERROR("bad file type %o unlinking %s\n", rec->ur_mode,
2426                        rec->ur_name);
2427                 LBUG();
2428                 GOTO(cleanup, rc = -EINVAL);
2429         }
2430
2431         if (rc == 0 && child_inode->i_nlink == 0) {
2432                 if (mds_orphan_open_count(child_inode) > 0)
2433                         rc = mds_orphan_add_link(rec, obd, dchild);
2434
2435                 if (rc == 1)
2436                         GOTO(cleanup, rc = 0);
2437
2438                 if (!S_ISREG(child_inode->i_mode))
2439                         GOTO(cleanup, rc);
2440
2441                 if (!(body->valid & OBD_MD_FLEASIZE)) {
2442                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
2443                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
2444                 } else if (mds_log_op_unlink(obd, child_inode,
2445                                              lustre_msg_buf(req->rq_repmsg, offset + 1, 0),
2446                                              req->rq_repmsg->buflens[offset + 1],
2447                                              lustre_msg_buf(req->rq_repmsg, offset + 2, 0),
2448                                              req->rq_repmsg->buflens[offset + 2],
2449                                              &lcl) > 0){
2450                         body->valid |= OBD_MD_FLCOOKIE;
2451                 }
2452
2453                 rc = mds_destroy_object(obd, child_inode, 1);
2454                 if (rc) {
2455                         CERROR("can't remove OST object, err %d\n",
2456                                rc);
2457                 }
2458
2459                 if (child_inode->i_nlink == 0)
2460                         mds_fidmap_del(obd, &body->id1);
2461         }
2462
2463         GOTO(cleanup, rc);
2464
2465 cleanup:
2466         if (rc == 0) {
2467                 struct iattr iattr;
2468                 int err;
2469
2470                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
2471                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
2472                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
2473
2474                 err = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
2475                 if (err)
2476                         CERROR("error on parent setattr: rc = %d\n", err);
2477         }
2478
2479         rc = mds_finish_transno(mds, dparent ? dparent->d_inode : NULL,
2480                                 handle, req, rc, 0);
2481         if (!rc)
2482                 (void)obd_set_info(mds->mds_dt_exp, strlen("unlinked"),
2483                                    "unlinked", 0, NULL);
2484
2485         switch(cleanup_phase) {
2486         case 5: /* pending_dir semaphore */
2487                 up(&mds->mds_pending_dir->d_inode->i_sem);
2488         case 4: /* child inode semaphore */
2489                 UP_READ_I_ALLOC_SEM(child_inode);
2490                  /* handle splitted dir */
2491                 if (rc == 0) {
2492                         /* master directory can be non-empty or something else ... */
2493                         mds_unlink_slave_objs(obd, dchild);
2494                 }
2495                 if (lcl != NULL)
2496                         ptlrpc_save_llog_lock(req, lcl);
2497         case 3: /* child ino-reuse lock */
2498                 if (rc && body != NULL) {
2499                         // Don't unlink the OST objects if the MDS unlink failed
2500                         body->valid = 0;
2501                 }
2502                 if (rc)
2503                         ldlm_lock_decref(&child_reuse_lockh, LCK_EX);
2504                 else
2505                         ptlrpc_save_lock(req, &child_reuse_lockh, LCK_EX);
2506         case 2: /* child lock */
2507                 mds_unlock_slave_objs(obd, dchild, slave_lockh);
2508                 if (child_lockh.cookie)
2509                         ldlm_lock_decref(&child_lockh, LCK_EX);
2510         case 1: /* child and parent dentry, parent lock */
2511 #ifdef S_PDIROPS
2512                 if (parent_lockh[1].cookie != 0)
2513                         ldlm_lock_decref(parent_lockh + 1, update_mode);
2514 #endif
2515                 if (rc)
2516                         ldlm_lock_decref(parent_lockh, LCK_PW);
2517                 else
2518                         ptlrpc_save_lock(req, parent_lockh, LCK_PW);
2519                 if (dchild->d_inode && rc && (dchild->d_inode->i_nlink == 0 ||
2520                                 mds_inode_is_orphan(dchild->d_inode)))
2521                         CDEBUG(D_ERROR, "unlink, but return %d\n", rc);
2522
2523                 /* catching failed permissions check for audit */
2524                 if (rc == -EACCES)
2525                         mds_audit(req, dchild, NULL, 0, AUDIT_UNLINK, rc);
2526
2527                 l_dput(dchild);
2528                 l_dput(dchild);
2529                 l_dput(dparent);
2530         case 0:
2531                 break;
2532         default:
2533                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2534                 LBUG();
2535         }
2536         req->rq_status = rc;
2537         return 0;
2538 }
2539
2540 /*
2541  * to service requests from remote MDS to increment i_nlink
2542  */
2543 static int mds_reint_link_acquire(struct mds_update_record *rec,
2544                                   int offset, struct ptlrpc_request *req,
2545                                   struct lustre_handle *lh)
2546 {
2547         struct obd_device *obd = req->rq_export->exp_obd;
2548         struct ldlm_res_id src_res_id = { .name = {0} };
2549         struct lustre_handle *handle = NULL, src_lockh = {0};
2550         struct mds_obd *mds = mds_req2mds(req);
2551         int rc = 0, cleanup_phase = 0;
2552         struct dentry *de_src = NULL;
2553         ldlm_policy_data_t policy;
2554         int flags = LDLM_FL_ATOMIC_CB;
2555         ENTRY;
2556
2557         DEBUG_REQ(D_INODE, req, "%s: request to acquire i_nlinks "DLID4"\n",
2558                   obd->obd_name, OLID4(rec->ur_id1));
2559
2560         /* Step 1: Lookup the source inode and target directory by ID */
2561         de_src = mds_id2dentry(obd, rec->ur_id1, NULL);
2562         if (IS_ERR(de_src))
2563                 GOTO(cleanup, rc = PTR_ERR(de_src));
2564         cleanup_phase = 1; /* source dentry */
2565
2566         src_res_id.name[0] = id_fid(rec->ur_id1);
2567         src_res_id.name[1] = id_group(rec->ur_id1);
2568         policy.l_inodebits.bits = MDS_INODELOCK_UPDATE;
2569
2570         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
2571                               src_res_id, LDLM_IBITS, &policy,
2572                               LCK_EX, &flags, mds_blocking_ast,
2573                               ldlm_completion_ast, NULL, NULL,
2574                               NULL, 0, NULL, &src_lockh);
2575         if (rc != ELDLM_OK)
2576                 GOTO(cleanup, rc = -ENOLCK);
2577         cleanup_phase = 2; /* lock */
2578
2579         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_src->d_inode->i_sb);
2580
2581         handle = fsfilt_start(obd, de_src->d_inode, FSFILT_OP_LINK, NULL);
2582         if (IS_ERR(handle)) {
2583                 rc = PTR_ERR(handle);
2584                 GOTO(cleanup, rc);
2585         }
2586         i_nlink_inc(de_src->d_inode);
2587         mark_inode_dirty(de_src->d_inode);
2588
2589         EXIT;
2590 cleanup:
2591         rc = mds_finish_transno(mds, de_src ? de_src->d_inode : NULL,
2592                                 handle, req, rc, 0);
2593         switch (cleanup_phase) {
2594                 case 2:
2595                         if (rc)
2596                                 ldlm_lock_decref(&src_lockh, LCK_EX);
2597                         else
2598                                 ptlrpc_save_lock(req, &src_lockh, LCK_EX);
2599                 case 1:
2600                         l_dput(de_src);
2601                 case 0:
2602                         break;
2603                 default:
2604                         CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2605                         LBUG();
2606         }
2607         req->rq_status = rc;
2608         return 0;
2609 }
2610
2611 /*
2612  * request to link to foreign inode:
2613  *  - acquire i_nlinks on this inode
2614  *  - add dentry
2615  */
2616 static int mds_reint_link_to_remote(struct mds_update_record *rec,
2617                                     int offset, struct ptlrpc_request *req,
2618                                     struct lustre_handle *lh)
2619 {
2620         struct lustre_handle *handle = NULL, tgt_dir_lockh[2] = {{0}, {0}};
2621         struct obd_device *obd = req->rq_export->exp_obd;
2622         struct dentry *de_tgt_dir = NULL;
2623         struct mds_obd *mds = mds_req2mds(req);
2624         int rc = 0, cleanup_phase = 0;
2625         struct mdc_op_data *op_data;
2626         struct ptlrpc_request *request = NULL;
2627         int update_mode;
2628         ENTRY;
2629
2630         DEBUG_REQ(D_INODE, req, "%s: request to link "DLID4
2631                   ":%*s to foreign inode "DLID4"\n", obd->obd_name,
2632                   OLID4(rec->ur_id2), rec->ur_namelen - 1, rec->ur_name,
2633                   OLID4(rec->ur_id1));
2634
2635         de_tgt_dir = mds_id2locked_dentry(obd, rec->ur_id2, NULL, LCK_EX,
2636                                           tgt_dir_lockh, &update_mode,
2637                                           rec->ur_name, rec->ur_namelen - 1,
2638                                           MDS_INODELOCK_UPDATE);
2639         if (IS_ERR(de_tgt_dir))
2640                 GOTO(cleanup, rc = PTR_ERR(de_tgt_dir));
2641         cleanup_phase = 1;
2642
2643         OBD_ALLOC(op_data, sizeof(*op_data));
2644         if (op_data == NULL)
2645                 GOTO(cleanup, rc = -ENOMEM);
2646
2647         memset(op_data, 0, sizeof(*op_data));
2648         op_data->id1 = *(rec->ur_id1);
2649         rc = md_link(mds->mds_md_exp, op_data, &request);
2650         OBD_FREE(op_data, sizeof(*op_data));
2651
2652         if (request)
2653                 ptlrpc_req_finished(request);
2654         if (rc)
2655                 GOTO(cleanup, rc);
2656
2657         cleanup_phase = 2;
2658
2659         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_tgt_dir->d_inode->i_sb);
2660
2661         handle = fsfilt_start(obd, de_tgt_dir->d_inode, FSFILT_OP_LINK, NULL);
2662         if (IS_ERR(handle)) {
2663                 rc = PTR_ERR(handle);
2664                 GOTO(cleanup, rc);
2665         }
2666
2667         cleanup_phase = 3;
2668
2669         rc = fsfilt_add_dir_entry(obd, de_tgt_dir, rec->ur_name,
2670                                   rec->ur_namelen - 1, id_ino(rec->ur_id1),
2671                                   id_gen(rec->ur_id1), id_group(rec->ur_id1),
2672                                   id_fid(rec->ur_id1));
2673         EXIT;
2674 cleanup:
2675         rc = mds_finish_transno(mds, de_tgt_dir ? de_tgt_dir->d_inode : NULL,
2676                                 handle, req, rc, 0);
2677
2678         switch (cleanup_phase) {
2679                 case 3:
2680                         if (rc) {
2681                                 OBD_ALLOC(op_data, sizeof(*op_data));
2682                                 if (op_data != NULL) {
2683                                         request = NULL;
2684                                         memset(op_data, 0, sizeof(*op_data));
2685
2686                                         op_data->id1 = *(rec->ur_id1);
2687                                         op_data->create_mode = rec->ur_mode;
2688
2689                                         rc = md_unlink(mds->mds_md_exp, op_data, &request);
2690                                         OBD_FREE(op_data, sizeof(*op_data));
2691                                         if (request)
2692                                                 ptlrpc_req_finished(request);
2693                                         if (rc) {
2694                                                 CERROR("error %d while dropping i_nlink on "
2695                                                        "remote inode\n", rc);
2696                                         }
2697                                 } else {
2698                                         CERROR("rc %d prevented dropping i_nlink on "
2699                                                "remote inode\n", -ENOMEM);
2700                                 }
2701                         }
2702                 case 2:
2703                 case 1:
2704                         if (rc) {
2705                                 ldlm_lock_decref(tgt_dir_lockh, LCK_EX);
2706 #ifdef S_PDIROPS
2707                                 ldlm_lock_decref(tgt_dir_lockh + 1, update_mode);
2708 #endif
2709                         } else {
2710                                 ptlrpc_save_lock(req, tgt_dir_lockh, LCK_EX);
2711 #ifdef S_PDIROPS
2712                                 ptlrpc_save_lock(req, tgt_dir_lockh + 1, update_mode);
2713 #endif
2714                         }
2715                         l_dput(de_tgt_dir);
2716                         break;
2717                 default:
2718                         CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2719                         LBUG();
2720         }
2721         req->rq_status = rc;
2722         return 0;
2723 }
2724
2725 static int mds_reint_link(struct mds_update_record *rec, int offset,
2726                           struct ptlrpc_request *req, struct lustre_handle *lh)
2727 {
2728         struct obd_device *obd = req->rq_export->exp_obd;
2729         struct dentry *de_src = NULL;
2730         struct dentry *de_tgt_dir = NULL;
2731         struct dentry *dchild = NULL;
2732         struct mds_obd *mds = mds_req2mds(req);
2733         struct lustre_handle *handle = NULL;
2734         struct lustre_handle tgt_dir_lockh[2] = {{0}, {0}}, src_lockh = {0};
2735         struct ldlm_res_id src_res_id = { .name = {0} };
2736         struct ldlm_res_id tgt_dir_res_id = { .name = {0} };
2737         ldlm_policy_data_t src_policy ={.l_inodebits = {MDS_INODELOCK_UPDATE}};
2738         ldlm_policy_data_t tgt_dir_policy =
2739                                        {.l_inodebits = {MDS_INODELOCK_UPDATE}};
2740         int rc = 0, cleanup_phase = 0;
2741 #ifdef S_PDIROPS
2742         int update_mode = 0;
2743 #endif
2744         ENTRY;
2745
2746         LASSERT(offset == 1);
2747
2748         DEBUG_REQ(D_INODE, req, "original "LPU64"/%u to "LPU64"/%u %s",
2749                   id_ino(rec->ur_id1), id_gen(rec->ur_id1),
2750                   id_ino(rec->ur_id2), id_gen(rec->ur_id2),
2751                   rec->ur_name);
2752
2753         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
2754         MD_COUNTER_INCREMENT(obd, link);
2755
2756         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_LINK))
2757                 GOTO(cleanup, rc = -ENOENT);
2758
2759         if (id_group(rec->ur_id1) != mds->mds_num) {
2760                 rc = mds_reint_link_to_remote(rec, offset, req, lh);
2761                 RETURN(rc);
2762         }
2763
2764         if (rec->ur_namelen == 1) {
2765                 rc = mds_reint_link_acquire(rec, offset, req, lh);
2766                 RETURN(rc);
2767         }
2768
2769         /* Step 1: Lookup the source inode and target directory by ID */
2770         de_src = mds_id2dentry(obd, rec->ur_id1, NULL);
2771         if (IS_ERR(de_src))
2772                 GOTO(cleanup, rc = PTR_ERR(de_src));
2773
2774         cleanup_phase = 1; /* source dentry */
2775
2776         de_tgt_dir = mds_id2dentry(obd, rec->ur_id2, NULL);
2777         if (IS_ERR(de_tgt_dir)) {
2778                 rc = PTR_ERR(de_tgt_dir);
2779                 de_tgt_dir = NULL;
2780                 GOTO(cleanup, rc);
2781         }
2782
2783         cleanup_phase = 2; /* target directory dentry */
2784
2785         CDEBUG(D_INODE, "linking %*s/%s to inode %lu\n",
2786                de_tgt_dir->d_name.len, de_tgt_dir->d_name.name,
2787                rec->ur_name, de_src->d_inode->i_ino);
2788
2789         /* Step 2: Take the two locks */
2790         src_res_id.name[0] = id_fid(rec->ur_id1);
2791         src_res_id.name[1] = id_group(rec->ur_id1);
2792         tgt_dir_res_id.name[0] = id_fid(rec->ur_id2);
2793         tgt_dir_res_id.name[1] = id_group(rec->ur_id2);
2794
2795 #ifdef S_PDIROPS
2796         if (IS_PDIROPS(de_tgt_dir->d_inode)) {
2797                 int flags = LDLM_FL_ATOMIC_CB;
2798                 update_mode = mds_lock_mode_for_dir(obd, de_tgt_dir, LCK_EX);
2799                 if (update_mode) {
2800                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
2801                                               tgt_dir_res_id, LDLM_IBITS,
2802                                               &src_policy, update_mode, &flags,
2803                                               mds_blocking_ast,
2804                                               ldlm_completion_ast, NULL, NULL,
2805                                               NULL, 0, NULL, tgt_dir_lockh + 1);
2806                         if (rc != ELDLM_OK)
2807                                 GOTO(cleanup, rc = -ENOLCK);
2808                 }
2809
2810                 tgt_dir_res_id.name[2] = full_name_hash((unsigned char *)rec->ur_name,
2811                                                         rec->ur_namelen - 1);
2812                 CDEBUG(D_INFO, "take lock on %lu:%lu:"LPX64"\n",
2813                        (unsigned long)id_fid(rec->ur_id2),
2814                        (unsigned long)id_group(rec->ur_id2),
2815                        tgt_dir_res_id.name[2]);
2816         }
2817 #endif
2818         rc = enqueue_ordered_locks(obd, &src_res_id, &src_lockh, LCK_EX,
2819                                    &src_policy, &tgt_dir_res_id, tgt_dir_lockh,
2820                                    LCK_EX, &tgt_dir_policy);
2821         if (rc)
2822                 GOTO(cleanup, rc);
2823
2824         cleanup_phase = 3; /* locks */
2825
2826         /* Step 3: Lookup the child */
2827         dchild = ll_lookup_one_len(rec->ur_name, de_tgt_dir,
2828                                    rec->ur_namelen - 1);
2829         if (IS_ERR(dchild)) {
2830                 rc = PTR_ERR(dchild);
2831                 if (rc != -EPERM && rc != -EACCES)
2832                         CERROR("child lookup error %d\n", rc);
2833                 GOTO(cleanup, rc);
2834         }
2835
2836         cleanup_phase = 4; /* child dentry */
2837
2838         if (dchild->d_inode) {
2839                 CDEBUG(D_INODE, "child exists (dir %lu, name %s)\n",
2840                        de_tgt_dir->d_inode->i_ino, rec->ur_name);
2841                 rc = -EEXIST;
2842                 GOTO(cleanup, rc);
2843         }
2844
2845         /* Step 4: Do it. */
2846         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_src->d_inode->i_sb);
2847
2848         handle = fsfilt_start(obd, de_tgt_dir->d_inode, FSFILT_OP_LINK, NULL);
2849         if (IS_ERR(handle)) {
2850                 rc = PTR_ERR(handle);
2851                 GOTO(cleanup, rc);
2852         }
2853
2854         rc = vfs_link(de_src, de_tgt_dir->d_inode, dchild);
2855         if (rc && rc != -EPERM && rc != -EACCES)
2856                 CERROR("vfs_link error %d\n", rc);
2857 cleanup:
2858         rc = mds_finish_transno(mds, de_tgt_dir ? de_tgt_dir->d_inode : NULL,
2859                                 handle, req, rc, 0);
2860         EXIT;
2861
2862         switch (cleanup_phase) {
2863         case 4: /* child dentry */
2864                 l_dput(dchild);
2865         case 3: /* locks */
2866                 if (rc) {
2867                         ldlm_lock_decref(&src_lockh, LCK_EX);
2868                         ldlm_lock_decref(tgt_dir_lockh, LCK_EX);
2869                 } else {
2870                         ptlrpc_save_lock(req, &src_lockh, LCK_EX);
2871                         ptlrpc_save_lock(req, tgt_dir_lockh, LCK_EX);
2872                 }
2873         case 2: /* target dentry */
2874 #ifdef S_PDIROPS
2875                 if (tgt_dir_lockh[1].cookie && update_mode)
2876                         ldlm_lock_decref(tgt_dir_lockh + 1, update_mode);
2877 #endif
2878                 if (de_tgt_dir)
2879                         l_dput(de_tgt_dir);
2880         case 1: /* source dentry */
2881                 l_dput(de_src);
2882         case 0:
2883                 break;
2884         default:
2885                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2886                 LBUG();
2887         }
2888         req->rq_status = rc;
2889         return 0;
2890 }
2891
2892 /* The idea here is that we need to get four locks in the end:
2893  * one on each parent directory, one on each child.  We need to take
2894  * these locks in some kind of order (to avoid deadlocks), and the order
2895  * I selected is "increasing resource number" order.  We need to look up
2896  * the children, however, before we know what the resource number(s) are.
2897  * Thus the following plan:
2898  *
2899  * 1,2. Look up the parents
2900  * 3,4. Look up the children
2901  * 5. Take locks on the parents and children, in order
2902  * 6. Verify that the children haven't changed since they were looked up
2903  *
2904  * If there was a race and the children changed since they were first looked
2905  * up, it is possible that mds_verify_child() will be able to just grab the
2906  * lock on the new child resource (if it has a higher resource than any other)
2907  * but we need to compare against not only its parent, but also against the
2908  * parent and child of the "other half" of the rename, hence maxres_{src,tgt}.
2909  *
2910  * We need the fancy igrab() on the child inodes because we aren't holding a
2911  * lock on the parent after the lookup is done, so dentry->d_inode may change
2912  * at any time, and igrab() itself doesn't like getting passed a NULL argument.
2913  */
2914 static int mds_get_parents_children_locked(struct obd_device *obd,
2915                                            struct mds_obd *mds,
2916                                            struct lustre_id *p1_id,
2917                                            struct dentry **de_srcdirp,
2918                                            struct lustre_id *p2_id,
2919                                            struct dentry **de_tgtdirp,
2920                                            int parent_mode,
2921                                            const char *old_name, int old_len,
2922                                            struct dentry **de_oldp,
2923                                            const char *new_name, int new_len,
2924                                            struct dentry **de_newp,
2925                                            struct lustre_handle *dlm_handles,
2926                                            int child_mode)
2927 {
2928         struct ldlm_res_id p1_res_id = { .name = {0} };
2929         struct ldlm_res_id p2_res_id = { .name = {0} };
2930         struct ldlm_res_id c1_res_id = { .name = {0} };
2931         struct ldlm_res_id c2_res_id = { .name = {0} };
2932         ldlm_policy_data_t p_policy = {.l_inodebits = {MDS_INODELOCK_UPDATE}};
2933         /* Only dentry should disappear, but the inode itself would be
2934            intact otherwise. */
2935         ldlm_policy_data_t c1_policy = {.l_inodebits = {MDS_INODELOCK_LOOKUP}};
2936         /* If something is going to be replaced, both dentry and inode locks are
2937            needed */
2938         ldlm_policy_data_t c2_policy = {.l_inodebits = {MDS_INODELOCK_FULL}};
2939         struct ldlm_res_id *maxres_src, *maxres_tgt;
2940         struct inode *inode;
2941         int rc = 0, cleanup_phase = 0;
2942         __u32 child_gen1 = 0;
2943         __u32 child_gen2 = 0;
2944         unsigned long child_ino1 = 0;
2945         unsigned long child_ino2 = 0;
2946         ENTRY;
2947
2948         /* Step 1: Lookup the source directory */
2949         *de_srcdirp = mds_id2dentry(obd, p1_id, NULL);
2950         if (IS_ERR(*de_srcdirp))
2951                 GOTO(cleanup, rc = PTR_ERR(*de_srcdirp));
2952
2953         cleanup_phase = 1; /* source directory dentry */
2954
2955         p1_res_id.name[0] = id_fid(p1_id);
2956         p1_res_id.name[1] = id_group(p1_id);
2957
2958         /* Step 2: Lookup the target directory */
2959         if (id_equal_stc(p1_id, p2_id)) {
2960                 *de_tgtdirp = dget(*de_srcdirp);
2961         } else {
2962                 *de_tgtdirp = mds_id2dentry(obd, p2_id, NULL);
2963                 if (IS_ERR(*de_tgtdirp)) {
2964                         rc = PTR_ERR(*de_tgtdirp);
2965                         *de_tgtdirp = NULL;
2966                         GOTO(cleanup, rc);
2967                 }
2968         }
2969
2970         cleanup_phase = 2; /* target directory dentry */
2971
2972         p2_res_id.name[0] = id_fid(p2_id);
2973         p2_res_id.name[1] = id_group(p2_id);
2974
2975 #ifdef S_PDIROPS
2976         dlm_handles[5].cookie = 0;
2977         dlm_handles[6].cookie = 0;
2978
2979         if (IS_PDIROPS((*de_srcdirp)->d_inode)) {
2980                 /*
2981                  * get a temp lock on just fid, group to flush client cache and
2982                  * to protect dirs from concurrent splitting.
2983                  */
2984                 rc = enqueue_ordered_locks(obd, &p1_res_id, &dlm_handles[5],
2985                                            LCK_PW, &p_policy, &p2_res_id,
2986                                            &dlm_handles[6], LCK_PW, &p_policy);
2987                 if (rc != ELDLM_OK)
2988                         GOTO(cleanup, rc);
2989
2990                 p1_res_id.name[2] = full_name_hash((unsigned char *)old_name,
2991                                                    old_len - 1);
2992                 p2_res_id.name[2] = full_name_hash((unsigned char *)new_name,
2993                                                    new_len - 1);
2994
2995                 CDEBUG(D_INFO, "take locks on "
2996                        LPX64":"LPX64":"LPX64", "LPX64":"LPX64":"LPX64"\n",
2997                        p1_res_id.name[0], p1_res_id.name[1], p1_res_id.name[2],
2998                        p2_res_id.name[0], p2_res_id.name[1], p2_res_id.name[2]);
2999         }
3000         cleanup_phase = 3;
3001 #endif
3002
3003         /* Step 3: Lookup the source child entry */
3004         *de_oldp = ll_lookup_one_len(old_name, *de_srcdirp,
3005                                      old_len - 1);
3006         if (IS_ERR(*de_oldp)) {
3007                 rc = PTR_ERR(*de_oldp);
3008                 CERROR("old child lookup error (%.*s): %d\n",
3009                        old_len - 1, old_name, rc);
3010                 GOTO(cleanup, rc);
3011         }
3012
3013         cleanup_phase = 4; /* original name dentry */
3014
3015         inode = (*de_oldp)->d_inode;
3016         if (inode != NULL) {
3017                 struct lustre_id sid;
3018
3019                 inode = igrab(inode);
3020                 if (inode == NULL)
3021                         GOTO(cleanup, rc = -ENOENT);
3022
3023                 down(&inode->i_sem);
3024                 rc = mds_read_inode_sid(obd, inode, &sid);
3025                 up(&inode->i_sem);
3026                 if (rc) {
3027                         CERROR("Can't read inode self id, inode %lu, "
3028                                "rc %d\n", inode->i_ino, rc);
3029                         iput(inode);
3030                         GOTO(cleanup, rc);
3031                 }
3032
3033                 child_ino1 = inode->i_ino;
3034                 child_gen1 = inode->i_generation;
3035                 c1_res_id.name[0] = id_fid(&sid);
3036                 c1_res_id.name[1] = id_group(&sid);
3037                 iput(inode);
3038         } else if ((*de_oldp)->d_flags & DCACHE_CROSS_REF) {
3039                 child_ino1 = (*de_oldp)->d_inum;
3040                 child_gen1 = (*de_oldp)->d_generation;
3041                 c1_res_id.name[0] = (*de_oldp)->d_fid;
3042                 c1_res_id.name[1] = (*de_oldp)->d_mdsnum;
3043         } else {
3044                 GOTO(cleanup, rc = -ENOENT);
3045         }
3046
3047         /* Step 4: Lookup the target child entry */
3048         *de_newp = ll_lookup_one_len(new_name, *de_tgtdirp,
3049                                      new_len - 1);
3050         if (IS_ERR(*de_newp)) {
3051                 rc = PTR_ERR(*de_newp);
3052                 CERROR("new child lookup error (%.*s): %d\n",
3053                        old_len - 1, old_name, rc);
3054                 GOTO(cleanup, rc);
3055         }
3056
3057         cleanup_phase = 5; /* target dentry */
3058
3059         inode = (*de_newp)->d_inode;
3060         if (inode != NULL) {
3061                 struct lustre_id sid;
3062
3063                 inode = igrab(inode);
3064                 if (inode == NULL)
3065                         goto retry_locks;
3066
3067                 down(&inode->i_sem);
3068                 rc = mds_read_inode_sid(obd, inode, &sid);
3069                 up(&inode->i_sem);
3070                 if (rc) {
3071                         CERROR("Can't read inode self id, inode %lu, "
3072                                "rc %d\n", inode->i_ino, rc);
3073                         GOTO(cleanup, rc);
3074                 }
3075
3076                 child_ino2 = inode->i_ino;
3077                 child_gen2 = inode->i_generation;
3078                 c2_res_id.name[0] = id_fid(&sid);
3079                 c2_res_id.name[1] = id_group(&sid);
3080                 iput(inode);
3081         } else if ((*de_newp)->d_flags & DCACHE_CROSS_REF) {
3082                 child_ino2 = (*de_newp)->d_inum;
3083                 child_gen2 = (*de_newp)->d_generation;
3084                 c2_res_id.name[0] = (*de_newp)->d_fid;
3085                 c2_res_id.name[1] = (*de_newp)->d_mdsnum;
3086         }
3087
3088 retry_locks:
3089         /* Step 5: Take locks on the parents and child(ren) */
3090         maxres_src = &p1_res_id;
3091         maxres_tgt = &p2_res_id;
3092         cleanup_phase = 5; /* target dentry */
3093
3094         if (c1_res_id.name[0] != 0 && res_gt(&c1_res_id, &p1_res_id, NULL, NULL))
3095                 maxres_src = &c1_res_id;
3096         if (c2_res_id.name[0] != 0 && res_gt(&c2_res_id, &p2_res_id, NULL, NULL))
3097                 maxres_tgt = &c2_res_id;
3098
3099         rc = enqueue_4ordered_locks(obd, &p1_res_id, &dlm_handles[0], parent_mode,
3100                                     &p_policy,
3101                                     &p2_res_id, &dlm_handles[1], parent_mode,
3102                                     &p_policy,
3103                                     &c1_res_id, &dlm_handles[2], child_mode,
3104                                     &c1_policy,
3105                                     &c2_res_id, &dlm_handles[3], child_mode,
3106                                     &c2_policy);
3107         if (rc)
3108                 GOTO(cleanup, rc);
3109
3110         cleanup_phase = 6; /* parent and child(ren) locks */
3111
3112         /* Step 6a: Re-lookup source child to verify it hasn't changed */
3113         rc = mds_verify_child(obd, &p1_res_id, &dlm_handles[0], *de_srcdirp,
3114                               parent_mode, &c1_res_id, &dlm_handles[2],
3115                               de_oldp, child_mode, &c1_policy, old_name, old_len,
3116                               maxres_tgt, child_ino1, child_gen1);
3117         if (rc) {
3118                 if (c2_res_id.name[0] != 0)
3119                         ldlm_lock_decref(&dlm_handles[3], child_mode);
3120                 ldlm_lock_decref(&dlm_handles[1], parent_mode);
3121                 cleanup_phase = 5;
3122                 if (rc > 0)
3123                         goto retry_locks;
3124                 GOTO(cleanup, rc);
3125         }
3126
3127         if (!DENTRY_VALID(*de_oldp))
3128                 GOTO(cleanup, rc = -ENOENT);
3129
3130         /* Step 6b: Re-lookup target child to verify it hasn't changed */
3131         rc = mds_verify_child(obd, &p2_res_id, &dlm_handles[1], *de_tgtdirp,
3132                               parent_mode, &c2_res_id, &dlm_handles[3],
3133                               de_newp, child_mode, &c2_policy, new_name,
3134                               new_len, maxres_src, child_ino2, child_gen2);
3135         if (rc) {
3136                 ldlm_lock_decref(&dlm_handles[2], child_mode);
3137                 ldlm_lock_decref(&dlm_handles[0], parent_mode);
3138                 cleanup_phase = 5;
3139                 if (rc > 0)
3140                         goto retry_locks;
3141                 GOTO(cleanup, rc);
3142         }
3143
3144         EXIT;
3145 cleanup:
3146         if (rc) {
3147                 switch (cleanup_phase) {
3148                 case 6: /* child lock(s) */
3149                         if (c2_res_id.name[0] != 0)
3150                                 ldlm_lock_decref(&dlm_handles[3], child_mode);
3151                         if (c1_res_id.name[0] != 0)
3152                                 ldlm_lock_decref(&dlm_handles[2], child_mode);
3153                         if (dlm_handles[1].cookie != 0)
3154                                 ldlm_lock_decref(&dlm_handles[1], parent_mode);
3155                         if (dlm_handles[0].cookie != 0)
3156                                 ldlm_lock_decref(&dlm_handles[0], parent_mode);
3157                 case 5: /* target dentry */
3158                         l_dput(*de_newp);
3159                 case 4: /* source dentry */
3160                         l_dput(*de_oldp);
3161                 case 3:
3162 #ifdef S_PDIROPS
3163                         if (dlm_handles[5].cookie != 0)
3164                                 ldlm_lock_decref(&(dlm_handles[5]), LCK_PW);
3165                         if (dlm_handles[6].cookie != 0)
3166                                 ldlm_lock_decref(&(dlm_handles[6]), LCK_PW);
3167 #endif
3168                 case 2: /* target directory dentry */
3169                         l_dput(*de_tgtdirp);
3170                 case 1: /* source directry dentry */
3171                         l_dput(*de_srcdirp);
3172                 }
3173         }
3174
3175         return rc;
3176 }
3177
3178 /*
3179  * checks if dentry can be removed. This function also handles cross-ref
3180  * dentries.
3181  */
3182 static int mds_check_for_rename(struct obd_device *obd,
3183                                 struct dentry *dentry)
3184 {
3185         struct mds_obd *mds = &obd->u.mds;
3186         struct lustre_handle *rlockh;
3187         struct ptlrpc_request *req;
3188         struct mdc_op_data *op_data;
3189         struct lookup_intent it;
3190         int handle_size, rc = 0;
3191         ENTRY;
3192
3193         LASSERT(dentry != NULL);
3194
3195         if (dentry->d_inode) {
3196                 if (S_ISDIR(dentry->d_inode->i_mode) &&
3197                     !mds_is_dir_empty(obd, dentry))
3198                         rc = -ENOTEMPTY;
3199         } else {
3200                 LASSERT((dentry->d_flags & DCACHE_CROSS_REF));
3201                 handle_size = sizeof(struct lustre_handle);
3202
3203                 OBD_ALLOC(rlockh, handle_size);
3204                 if (rlockh == NULL)
3205                         RETURN(-ENOMEM);
3206
3207                 memset(rlockh, 0, handle_size);
3208                 OBD_ALLOC(op_data, sizeof(*op_data));
3209                 if (op_data == NULL) {
3210                         OBD_FREE(rlockh, handle_size);
3211                         RETURN(-ENOMEM);
3212                 }
3213                 memset(op_data, 0, sizeof(*op_data));
3214                 mds_pack_dentry2id(obd, &op_data->id1, dentry, 1);
3215
3216                 it.it_op = IT_UNLINK;
3217                 OBD_ALLOC(it.d.fs_data, sizeof(struct lustre_intent_data));
3218                 if (!it.d.fs_data)
3219                         RETURN(-ENOMEM);
3220                 rc = md_enqueue(mds->mds_md_exp, LDLM_IBITS, &it, LCK_EX,
3221                                 op_data, rlockh, NULL, 0, ldlm_completion_ast,
3222                                 mds_blocking_ast, NULL);
3223                 OBD_FREE(op_data, sizeof(*op_data));
3224
3225
3226                 if (rc) {
3227                         OBD_FREE(it.d.fs_data,
3228                                  sizeof(struct lustre_intent_data));
3229                         RETURN(rc);
3230                 }
3231                 if (rlockh->cookie != 0)
3232                         ldlm_lock_decref(rlockh, LCK_EX);
3233
3234                 if (LUSTRE_IT(&it)->it_data) {
3235                         req = (struct ptlrpc_request *)LUSTRE_IT(&it)->it_data;
3236                         ptlrpc_req_finished(req);
3237                 }
3238
3239                 if (LUSTRE_IT(&it)->it_status)
3240                         rc = LUSTRE_IT(&it)->it_status;
3241                 OBD_FREE(it.d.fs_data, sizeof(struct lustre_intent_data));
3242                 OBD_FREE(rlockh, handle_size);
3243         }
3244         RETURN(rc);
3245 }
3246
3247 static int mds_add_local_dentry(struct mds_update_record *rec, int offset,
3248                                 struct ptlrpc_request *req, struct lustre_id *id,
3249                                 struct dentry *de_dir, struct dentry *de)
3250 {
3251         struct obd_device *obd = req->rq_export->exp_obd;
3252         struct mds_obd *mds = mds_req2mds(req);
3253         void *handle = NULL;
3254         int rc = 0;
3255         ENTRY;
3256
3257         if (de->d_inode) {
3258                 /*
3259                  * name exists and points to local inode try to unlink this name
3260                  * and create new one.
3261                  */
3262                 CDEBUG(D_OTHER, "%s: %s points to local inode %lu/%lu\n",
3263                        obd->obd_name, rec->ur_tgt, (unsigned long)de->d_inode->i_ino,
3264                        (unsigned long)de->d_inode->i_generation);
3265
3266                 /* checking if we can remove local dentry. */
3267                 rc = mds_check_for_rename(obd, de);
3268                 if (rc)
3269                         GOTO(cleanup, rc);
3270
3271                 handle = fsfilt_start(obd, de_dir->d_inode,
3272                                       FSFILT_OP_RENAME, NULL);
3273                 if (IS_ERR(handle))
3274                         GOTO(cleanup, rc = PTR_ERR(handle));
3275                 rc = fsfilt_del_dir_entry(req->rq_export->exp_obd, de);
3276                 if (rc)
3277                         GOTO(cleanup, rc);
3278         } else if (de->d_flags & DCACHE_CROSS_REF) {
3279                 CDEBUG(D_OTHER, "%s: %s points to remote inode %lu/%lu\n",
3280                        obd->obd_name, rec->ur_tgt, (unsigned long)de->d_mdsnum,
3281                         (unsigned long)de->d_fid);
3282
3283                 /* checking if we can remove local dentry. */
3284                 rc = mds_check_for_rename(obd, de);
3285                 if (rc)
3286                         GOTO(cleanup, rc);
3287
3288                 /*
3289                  * to be fully POSIX compatible, we should add one more check:
3290                  *
3291                  * if de_new is subdir of dir rec->ur_id1. If so - return
3292                  * -EINVAL.
3293                  *
3294                  * I do not know how to implement it right now, because
3295                  * inodes/dentries for new and old names lie on different MDS,
3296                  * so add this notice here just to make it visible for the rest
3297                  * of developers and do not forget about. And when this check
3298                  * will be added, del_cross_ref should gone, that is local
3299                  * dentry is able to be removed if all checks passed. --umka
3300                  */
3301
3302                 handle = fsfilt_start(obd, de_dir->d_inode,
3303                                       FSFILT_OP_RENAME, NULL);
3304                 if (IS_ERR(handle))
3305                         GOTO(cleanup, rc = PTR_ERR(handle));
3306                 rc = fsfilt_del_dir_entry(req->rq_export->exp_obd, de);
3307                 if (rc)
3308                         GOTO(cleanup, rc);
3309         } else {
3310                 /* name doesn't exist. the simplest case. */
3311                 handle = fsfilt_start(obd, de_dir->d_inode,
3312                                       FSFILT_OP_LINK, NULL);
3313                 if (IS_ERR(handle))
3314                         GOTO(cleanup, rc = PTR_ERR(handle));
3315         }
3316
3317         rc = fsfilt_add_dir_entry(obd, de_dir, rec->ur_tgt,
3318                                   rec->ur_tgtlen - 1, id_ino(id),
3319                                   id_gen(id), id_group(id), id_fid(id));
3320         if (rc) {
3321                 CERROR("add_dir_entry() returned error %d\n", rc);
3322                 GOTO(cleanup, rc);
3323         }
3324
3325         EXIT;
3326 cleanup:
3327         rc = mds_finish_transno(mds, de_dir ? de_dir->d_inode : NULL,
3328                                 handle, req, rc, 0);
3329
3330         return rc;
3331 }
3332
3333 static int mds_del_local_dentry(struct mds_update_record *rec, int offset,
3334                                 struct ptlrpc_request *req, struct dentry *de_dir,
3335                                 struct dentry *de)
3336 {
3337         struct obd_device *obd = req->rq_export->exp_obd;
3338         struct mds_obd *mds = mds_req2mds(req);
3339         void *handle = NULL;
3340         int rc = 0;
3341         ENTRY;
3342
3343         handle = fsfilt_start(obd, de_dir->d_inode, FSFILT_OP_UNLINK, NULL);
3344         if (IS_ERR(handle))
3345                 GOTO(cleanup, rc = PTR_ERR(handle));
3346         rc = fsfilt_del_dir_entry(obd, de);
3347         d_drop(de);
3348
3349         EXIT;
3350 cleanup:
3351         rc = mds_finish_transno(mds, de_dir ? de_dir->d_inode : NULL,
3352                                 handle, req, rc, 0);
3353         return rc;
3354 }
3355
3356 static int mds_reint_rename_create_name(struct mds_update_record *rec,
3357                                         int offset, struct ptlrpc_request *req)
3358 {
3359         struct lustre_handle parent_lockh[2] = {{0}, {0}};
3360         struct obd_device *obd = req->rq_export->exp_obd;
3361         struct mds_obd *mds = mds_req2mds(req);
3362         struct lustre_handle child_lockh = {0};
3363         struct dentry *de_tgtdir = NULL;
3364         struct dentry *de_new = NULL;
3365         int cleanup_phase = 0;
3366         int update_mode, rc = 0;
3367         struct lustre_id ids[2]; /* sid, pid */
3368         struct obd_export *set_exp;
3369         ENTRY;
3370
3371         /*
3372          * another MDS executing rename operation has asked us to create target
3373          * name. such a creation should destroy existing target name.
3374          */
3375         CDEBUG(D_OTHER, "%s: request to create name %s for "DLID4"\n",
3376                obd->obd_name, rec->ur_tgt, OLID4(rec->ur_id1));
3377
3378         /* first, lookup the target */
3379         rc = mds_get_parent_child_locked(obd, mds, rec->ur_id2, parent_lockh,
3380                                          &de_tgtdir, LCK_PW, MDS_INODELOCK_UPDATE,
3381                                          &update_mode, rec->ur_tgt, rec->ur_tgtlen,
3382                                          &child_lockh, &de_new, LCK_EX,
3383                                          MDS_INODELOCK_LOOKUP);
3384         if (rc)
3385                 GOTO(cleanup, rc);
3386
3387         /* get parent id: ldlm lock on the parent protects ea */
3388         rc = mds_read_inode_sid(obd, de_tgtdir->d_inode, &ids[1]);
3389
3390         if (rc)
3391                 GOTO(cleanup, rc);
3392         cleanup_phase = 1;
3393
3394         LASSERT(de_tgtdir);
3395         LASSERT(de_tgtdir->d_inode);
3396         LASSERT(de_new);
3397
3398         rc = mds_add_local_dentry(rec, offset, req, rec->ur_id1,
3399                                   de_tgtdir, de_new);
3400         if (rc)
3401                 GOTO(cleanup, rc);
3402
3403         ids[0] = *(rec->ur_id1);
3404         if (id_group(ids) == mds->mds_num)
3405                 set_exp = req->rq_export;
3406         else
3407                 set_exp = mds->mds_md_exp;
3408         rc = obd_set_info(set_exp, strlen("ids"), "ids",
3409                           sizeof(struct lustre_id) * 2, ids);
3410
3411         EXIT;
3412 cleanup:
3413
3414         if (cleanup_phase == 1) {
3415 #ifdef S_PDIROPS
3416                 if (parent_lockh[1].cookie != 0)
3417                         ldlm_lock_decref(parent_lockh + 1, update_mode);
3418 #endif
3419                 ldlm_lock_decref(parent_lockh, LCK_PW);
3420                 if (child_lockh.cookie != 0)
3421                         ldlm_lock_decref(&child_lockh, LCK_EX);
3422                 l_dput(de_new);
3423                 l_dput(de_tgtdir);
3424         }
3425
3426         req->rq_status = rc;
3427         return 0;
3428 }
3429
3430 static int mds_reint_rename_to_remote(struct mds_update_record *rec, int offset,
3431                                       struct ptlrpc_request *req)
3432 {
3433         struct obd_device *obd = req->rq_export->exp_obd;
3434         struct ptlrpc_request *req2 = NULL;
3435         struct dentry *de_srcdir = NULL;
3436         struct dentry *de_old = NULL;
3437         struct mds_obd *mds = mds_req2mds(req);
3438         struct lustre_handle parent_lockh[2] = {{0}, {0}};
3439         struct lustre_handle child_lockh = {0};
3440         struct mdc_op_data *op_data;
3441         int update_mode, rc = 0;
3442         ENTRY;
3443
3444         CDEBUG(D_OTHER, "%s: move name %s onto another mds #%lu\n",
3445                obd->obd_name, rec->ur_name, (unsigned long)id_group(rec->ur_id2));
3446
3447         OBD_ALLOC(op_data, sizeof(*op_data));
3448         if (op_data == NULL)
3449                 RETURN(-ENOMEM);
3450         memset(op_data, 0, sizeof(*op_data));
3451
3452         rc = mds_get_parent_child_locked(obd, mds, rec->ur_id1, parent_lockh,
3453                                          &de_srcdir, LCK_PW, MDS_INODELOCK_UPDATE,
3454                                          &update_mode, rec->ur_name,
3455                                          rec->ur_namelen, &child_lockh, &de_old,
3456                                          LCK_EX, MDS_INODELOCK_LOOKUP);
3457         if (rc) {
3458                 OBD_FREE(op_data, sizeof(*op_data));
3459                 RETURN(rc);
3460         }
3461
3462         LASSERT(de_srcdir);
3463         LASSERT(de_srcdir->d_inode);
3464         LASSERT(de_old);
3465
3466         /*
3467          * we already know the target should be created on another MDS so, we
3468          * have to request that MDS to do it.
3469          */
3470
3471         /* prepare source id */
3472         if (de_old->d_flags & DCACHE_CROSS_REF) {
3473                 LASSERT(de_old->d_inode == NULL);
3474                 CDEBUG(D_OTHER, "request to move remote name\n");
3475                 mds_pack_dentry2id(obd, &op_data->id1, de_old, 1);
3476         } else if (de_old->d_inode == NULL) {
3477                 /* oh, source doesn't exist */
3478                 OBD_FREE(op_data, sizeof(*op_data));
3479                 GOTO(cleanup, rc = -ENOENT);
3480         } else {
3481                 struct lustre_id sid;
3482                 struct inode *inode = de_old->d_inode;
3483
3484                 LASSERT(inode != NULL);
3485                 CDEBUG(D_OTHER, "request to move local name\n");
3486                 id_ino(&op_data->id1) = inode->i_ino;
3487                 id_group(&op_data->id1) = mds->mds_num;
3488                 id_gen(&op_data->id1) = inode->i_generation;
3489
3490                 down(&inode->i_sem);
3491                 rc = mds_read_inode_sid(obd, inode, &sid);
3492                 up(&inode->i_sem);
3493                 if (rc) {
3494                         CERROR("Can't read inode self id, "
3495                                "inode %lu, rc = %d\n",
3496                                inode->i_ino, rc);
3497                         GOTO(cleanup, rc);
3498                 }
3499
3500                 id_fid(&op_data->id1) = id_fid(&sid);
3501         }
3502
3503         op_data->id2 = *rec->ur_id2;
3504         rc = md_rename(mds->mds_md_exp, op_data, NULL, 0,
3505                        rec->ur_tgt, rec->ur_tgtlen - 1, &req2);
3506         OBD_FREE(op_data, sizeof(*op_data));
3507
3508         if (rc)
3509                 GOTO(cleanup, rc);
3510
3511         rc = mds_del_local_dentry(rec, offset, req, de_srcdir,
3512                                   de_old);
3513
3514         EXIT;
3515 cleanup:
3516         if (req2)
3517                 ptlrpc_req_finished(req2);
3518
3519 #ifdef S_PDIROPS
3520         if (parent_lockh[1].cookie != 0)
3521                 ldlm_lock_decref(parent_lockh + 1, update_mode);
3522 #endif
3523         ldlm_lock_decref(parent_lockh, LCK_PW);
3524         if (child_lockh.cookie != 0)
3525                 ldlm_lock_decref(&child_lockh, LCK_EX);
3526
3527         l_dput(de_old);
3528         l_dput(de_srcdir);
3529
3530         req->rq_status = rc;
3531         return 0;
3532 }
3533
3534 static int mds_reint_rename(struct mds_update_record *rec, int offset,
3535                             struct ptlrpc_request *req, struct lustre_handle *lockh)
3536 {
3537         struct obd_device *obd = req->rq_export->exp_obd;
3538         struct dentry *de_srcdir = NULL;
3539         struct dentry *de_tgtdir = NULL;
3540         struct dentry *de_old = NULL;
3541         struct dentry *de_new = NULL;
3542         struct inode *old_inode = NULL, *new_inode = NULL;
3543         struct mds_obd *mds = mds_req2mds(req);
3544         struct lustre_handle dlm_handles[7] = {{0},{0},{0},{0},{0},{0},{0}};
3545         struct mds_body *body = NULL;
3546         struct llog_create_locks *lcl = NULL;
3547         struct lov_mds_md *lmm = NULL;
3548         int rc = 0, cleanup_phase = 0;
3549         struct lustre_id ids[2];  /* sid, pid */
3550         void *handle = NULL;
3551         ENTRY;
3552
3553         LASSERT(offset == 1);
3554
3555         DEBUG_REQ(D_INODE, req, "parent "DLID4" %s to "DLID4" %s",
3556                   OLID4(rec->ur_id1), rec->ur_name, OLID4(rec->ur_id2),
3557                   rec->ur_tgt);
3558
3559         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
3560
3561         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
3562                 DEBUG_REQ(D_HA, req, "rename replay");
3563                 memcpy(lustre_msg_buf(req->rq_repmsg, 2, 0),
3564                        lustre_msg_buf(req->rq_reqmsg, offset + 3, 0),
3565                        req->rq_repmsg->buflens[2]);
3566         }
3567
3568         MD_COUNTER_INCREMENT(obd, rename);
3569
3570         if (rec->ur_namelen == 1) {
3571                 rc = mds_reint_rename_create_name(rec, offset, req);
3572                 RETURN(rc);
3573         }
3574
3575         /* check if new name should be located on remote target. */
3576         if (id_group(rec->ur_id2) != mds->mds_num) {
3577                 rc = mds_reint_rename_to_remote(rec, offset, req);
3578                 RETURN(rc);
3579         }
3580
3581         rc = mds_get_parents_children_locked(obd, mds, rec->ur_id1, &de_srcdir,
3582                                              rec->ur_id2, &de_tgtdir, LCK_PW,
3583                                              rec->ur_name, rec->ur_namelen,
3584                                              &de_old, rec->ur_tgt,
3585                                              rec->ur_tgtlen, &de_new,
3586                                              dlm_handles, LCK_EX);
3587         if (rc)
3588                 GOTO(cleanup, rc);
3589
3590         cleanup_phase = 1; /* parent(s), children, locks */
3591         old_inode = de_old->d_inode;
3592         new_inode = de_new->d_inode;
3593
3594         /* sanity check for src inode */
3595         if (de_old->d_flags & DCACHE_CROSS_REF) {
3596                 LASSERT(de_old->d_inode == NULL);
3597
3598                 /*
3599                  * in the case of cross-ref dir, we can perform this check only
3600                  * if child and parent lie on the same mds. This is because
3601                  * otherwise they can have the same inode numbers.
3602                  */
3603                 if (de_old->d_mdsnum == mds->mds_num) {
3604                         if (de_old->d_inum == de_srcdir->d_inode->i_ino ||
3605                             de_old->d_inum == de_tgtdir->d_inode->i_ino)
3606                                 GOTO(cleanup, rc = -EINVAL);
3607                 }
3608         } else {
3609                 LASSERT(de_old->d_inode != NULL);
3610                 if (de_old->d_inode->i_ino == de_srcdir->d_inode->i_ino ||
3611                     de_old->d_inode->i_ino == de_tgtdir->d_inode->i_ino)
3612                         GOTO(cleanup, rc = -EINVAL);
3613         }
3614
3615         /* sanity check for dest inode */
3616         if (de_new->d_flags & DCACHE_CROSS_REF) {
3617                 LASSERT(new_inode == NULL);
3618
3619                 /* the same check about target dentry. */
3620                 if (de_new->d_mdsnum == mds->mds_num) {
3621                         if (de_new->d_inum == de_srcdir->d_inode->i_ino ||
3622                             de_new->d_inum == de_tgtdir->d_inode->i_ino)
3623                                 GOTO(cleanup, rc = -EINVAL);
3624                 }
3625
3626                 /*
3627                  * regular files usualy do not have ->rename() implemented. But
3628                  * we handle only this case when @de_new is cross-ref entry,
3629                  * because in other cases it will be handled by vfs_rename().
3630                  */
3631                 if (de_old->d_inode && (!de_old->d_inode->i_op ||
3632                     !de_old->d_inode->i_op->rename))
3633                         GOTO(cleanup, rc = -EPERM);
3634         } else {
3635                 if (new_inode &&
3636                     (new_inode->i_ino == de_srcdir->d_inode->i_ino ||
3637                      new_inode->i_ino == de_tgtdir->d_inode->i_ino))
3638                         GOTO(cleanup, rc = -EINVAL);
3639
3640         }
3641
3642         /*
3643          * check if inodes point to each other. This should be checked before
3644          * is_subdir() check, as for the same entries it will think that they
3645          * are subdirs.
3646          */
3647         if (!(de_old->d_flags & DCACHE_CROSS_REF) &&
3648             !(de_new->d_flags & DCACHE_CROSS_REF) &&
3649             old_inode == new_inode)
3650                 GOTO(cleanup, rc = 0);
3651
3652 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
3653         /*
3654          * check if we are moving old entry into its child. 2.6 does not check
3655          * for this in vfs_rename() anymore.
3656          */
3657         if (is_subdir(de_new, de_old))
3658                 GOTO(cleanup, rc = -EINVAL);
3659 #endif
3660
3661         /*
3662          * if we are about to remove the target at first, pass the EA of that
3663          * inode to client to perform and cleanup on OST.
3664          */
3665         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
3666         LASSERT(body != NULL);
3667
3668         /* get new parent id: ldlm lock on the parent protects ea */
3669         rc = mds_read_inode_sid(obd, de_tgtdir->d_inode, &ids[1]);
3670         if (rc)
3671                 GOTO(cleanup, rc);
3672
3673         /* child i_alloc_sem protects orphan_dec_test && is_orphan race */
3674         if (new_inode)
3675                 DOWN_READ_I_ALLOC_SEM(new_inode);
3676
3677         cleanup_phase = 2; /* up(&new_inode->i_sem) when finished */
3678
3679         if (new_inode && ((S_ISDIR(new_inode->i_mode) &&
3680             new_inode->i_nlink == 2) ||
3681             new_inode->i_nlink == 1)) {
3682                 if (mds_orphan_open_count(new_inode) > 0) {
3683                         /* need to lock pending_dir before transaction */
3684                         down(&mds->mds_pending_dir->d_inode->i_sem);
3685                         cleanup_phase = 3; /* up(&pending_dir->i_sem) */
3686                 } else if (S_ISREG(new_inode->i_mode)) {
3687                         mds_pack_inode2body(obd, body, new_inode, 0);
3688                         mds_pack_md(obd, req->rq_repmsg, 1, body,
3689                                     new_inode, MDS_PACK_MD_LOCK, 0);
3690                  }
3691         }
3692
3693         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_RENAME_WRITE,
3694                        de_srcdir->d_inode->i_sb);
3695
3696         if (de_old->d_flags & DCACHE_CROSS_REF) {
3697                 struct lustre_id old_id;
3698                 struct obd_export *set_exp;
3699
3700
3701                 mds_pack_dentry2id(obd, &old_id, de_old, 1);
3702
3703                 rc = mds_add_local_dentry(rec, offset, req, &old_id,
3704                                           de_tgtdir, de_new);
3705                 if (rc)
3706                         GOTO(cleanup, rc);
3707
3708                 rc = mds_del_local_dentry(rec, offset, req, de_srcdir,
3709                                           de_old);
3710                 if (rc)
3711                         GOTO(cleanup, rc);
3712
3713                 ids[0] = old_id;
3714                 if (id_group(ids) == mds->mds_num)
3715                         set_exp = req->rq_export;
3716                 else
3717                         set_exp = mds->mds_md_exp;
3718                 rc = obd_set_info(set_exp, strlen("ids"), "ids",
3719                                   sizeof(struct lustre_id) * 2, ids);
3720
3721                 GOTO(cleanup, rc);
3722         }
3723
3724         lmm = lustre_msg_buf(req->rq_repmsg, 1, 0);
3725         handle = fsfilt_start_log(obd, de_tgtdir->d_inode, FSFILT_OP_RENAME,
3726                                   NULL, le32_to_cpu(lmm->lmm_stripe_count));
3727
3728         if (IS_ERR(handle))
3729                 GOTO(cleanup, rc = PTR_ERR(handle));
3730
3731         lock_kernel();
3732         de_old->d_fsdata = req;
3733         de_new->d_fsdata = req;
3734         rc = vfs_rename(de_srcdir->d_inode, de_old, de_tgtdir->d_inode, de_new);
3735         unlock_kernel();
3736
3737         if (rc == 0 && new_inode != NULL && new_inode->i_nlink == 0) {
3738                 if (mds_orphan_open_count(new_inode) > 0)
3739                         rc = mds_orphan_add_link(rec, obd, de_new);
3740
3741                 if (rc == 1)
3742                         GOTO(cleanup, rc = 0);
3743
3744                 if (!S_ISREG(new_inode->i_mode))
3745                         GOTO(cleanup, rc);
3746
3747                 if (!(body->valid & OBD_MD_FLEASIZE)) {
3748                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
3749                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
3750                 } else if (mds_log_op_unlink(obd, new_inode,
3751                                              lustre_msg_buf(req->rq_repmsg,1,0),
3752                                              req->rq_repmsg->buflens[1],
3753                                              lustre_msg_buf(req->rq_repmsg,2,0),
3754                                              req->rq_repmsg->buflens[2],
3755                                              &lcl) > 0) {
3756                         body->valid |= OBD_MD_FLCOOKIE;
3757                 }
3758
3759                 rc = mds_destroy_object(obd, old_inode, 1);
3760                 if (rc) {
3761                         CERROR("can't remove OST object, err %d\n",
3762                                rc);
3763                 }
3764         }
3765
3766         if (rc == 0)
3767                rc = mds_update_inode_ids(obd, de_old->d_inode,
3768                                          handle, NULL, &ids[1]);
3769
3770         EXIT;
3771 cleanup:
3772         rc = mds_finish_transno(mds, (de_tgtdir ? de_tgtdir->d_inode : NULL),
3773                                 handle, req, rc, 0);
3774
3775         switch (cleanup_phase) {
3776         case 3:
3777                 up(&mds->mds_pending_dir->d_inode->i_sem);
3778         case 2:
3779                 if (new_inode)
3780                         UP_READ_I_ALLOC_SEM(new_inode);
3781         case 1:
3782 #ifdef S_PDIROPS
3783                 if (dlm_handles[5].cookie != 0)
3784                         ldlm_lock_decref(&(dlm_handles[5]), LCK_PW);
3785                 if (dlm_handles[6].cookie != 0)
3786                         ldlm_lock_decref(&(dlm_handles[6]), LCK_PW);
3787 #endif
3788                 if (lcl != NULL)
3789                         ptlrpc_save_llog_lock(req, lcl);
3790
3791                 if (rc) {
3792                         if (dlm_handles[3].cookie != 0)
3793                                 ldlm_lock_decref(&(dlm_handles[3]), LCK_EX);
3794                         ldlm_lock_decref(&(dlm_handles[2]), LCK_EX);
3795                         ldlm_lock_decref(&(dlm_handles[1]), LCK_PW);
3796                         ldlm_lock_decref(&(dlm_handles[0]), LCK_PW);
3797                 } else {
3798                         if (dlm_handles[3].cookie != 0)
3799                                 ptlrpc_save_lock(req,&(dlm_handles[3]), LCK_EX);
3800                         ptlrpc_save_lock(req, &(dlm_handles[2]), LCK_EX);
3801                         ptlrpc_save_lock(req, &(dlm_handles[1]), LCK_PW);
3802                         ptlrpc_save_lock(req, &(dlm_handles[0]), LCK_PW);
3803                 }
3804                 l_dput(de_new);
3805                 l_dput(de_old);
3806                 l_dput(de_tgtdir);
3807                 l_dput(de_srcdir);
3808         case 0:
3809                 break;
3810         default:
3811                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
3812                 LBUG();
3813         }
3814         req->rq_status = rc;
3815         return 0;
3816 }
3817
3818 typedef int (*mds_reinter)(struct mds_update_record *, int offset,
3819                            struct ptlrpc_request *, struct lustre_handle *);
3820
3821 static mds_reinter reinters[REINT_MAX + 1] = {
3822         [REINT_SETATTR] mds_reint_setattr,
3823         [REINT_CREATE] mds_reint_create,
3824         [REINT_LINK] mds_reint_link,
3825         [REINT_UNLINK] mds_reint_unlink,
3826         [REINT_RENAME] mds_reint_rename,
3827         [REINT_OPEN] mds_open
3828 };
3829
3830 int mds_reint_rec(struct mds_update_record *rec, int offset,
3831                   struct ptlrpc_request *req, struct lustre_handle *lockh)
3832 {
3833         struct obd_device *obd = req->rq_export->exp_obd;
3834         struct lvfs_run_ctxt saved;
3835         int rc;
3836
3837         /* checked by unpacker */
3838         LASSERT(rec->ur_opcode <= REINT_MAX &&
3839                 reinters[rec->ur_opcode] != NULL);
3840
3841         push_ctxt(&saved, &obd->obd_lvfs_ctxt, &rec->ur_uc);
3842         rc = reinters[rec->ur_opcode] (rec, offset, req, lockh);
3843         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &rec->ur_uc);
3844
3845         return rc;
3846 }