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/ext3_fs.h>
  36 #include <linux/obd_support.h>
  37 #include <linux/obd_class.h>
  38 #include <linux/obd.h>
  39 #include <linux/lustre_lib.h>
  40 #include <linux/lustre_idl.h>
  41 #include <linux/lustre_mds.h>
  42 #include <linux/lustre_dlm.h>
  43 #include <linux/lustre_log.h>
  44 #include <linux/lustre_fsfilt.h>
  45 #include "mds_internal.h"
  46
  47 struct mds_logcancel_data {
  48         struct lov_mds_md      *mlcd_lmm;
  49         int                     mlcd_size;
  50         int                     mlcd_cookielen;
  51         int                     mlcd_eadatalen;
  52         struct llog_cookie      mlcd_cookies[0];
  53 };
  54
  55 static void mds_cancel_cookies_cb(struct obd_device *obd,
  56                                   __u64 transno, void *cb_data,
  57                                   int error)
  58 {
  59         struct mds_logcancel_data *mlcd = cb_data;
  60         struct lov_stripe_md *lsm = NULL;
  61         struct llog_ctxt *ctxt;
  62         int rc;
  63
  64         obd_transno_commit_cb(obd, transno, error);
  65
  66         CDEBUG(D_HA, "cancelling %d cookies\n",
  67                (int)(mlcd->mlcd_cookielen / sizeof(*mlcd->mlcd_cookies)));
  68
  69         rc = obd_unpackmd(obd->u.mds.mds_dt_exp, &lsm, mlcd->mlcd_lmm,
  70                           mlcd->mlcd_eadatalen);
  71         if (rc < 0) {
  72                 CERROR("bad LSM cancelling %d log cookies: rc %d\n",
  73                        (int)(mlcd->mlcd_cookielen/sizeof(*mlcd->mlcd_cookies)),
  74                        rc);
  75         } else {
  76                 ///* XXX 0 normally, SENDNOW for debug */);
  77                 ctxt = llog_get_context(&obd->obd_llogs,
  78                                         mlcd->mlcd_cookies[0].lgc_subsys + 1);
  79                 rc = llog_cancel(ctxt, mlcd->mlcd_cookielen /
  80                                  sizeof(*mlcd->mlcd_cookies),
  81                                  mlcd->mlcd_cookies, OBD_LLOG_FL_SENDNOW, lsm);
  82                 if (rc)
  83                         CERROR("error cancelling %d log cookies: rc %d\n",
  84                                (int)(mlcd->mlcd_cookielen /
  85                                      sizeof(*mlcd->mlcd_cookies)), rc);
  86         }
  87
  88         OBD_FREE(mlcd, mlcd->mlcd_size);
  89 }
  90
  91 /* Assumes caller has already pushed us into the kernel context. */
  92 int mds_finish_transno(struct mds_obd *mds, struct inode *inode, void *handle,
  93                        struct ptlrpc_request *req, int rc, __u32 op_data)
  94 {
  95         struct mds_export_data *med = &req->rq_export->exp_mds_data;
  96         struct obd_device *obd = req->rq_export->exp_obd;
  97         struct mds_client_data *mcd = med->med_mcd;
  98         int err, log_pri = D_HA;
  99         __u64 transno;
 100         loff_t off;
 101         ENTRY;
 102
 103         /* if the export has already been failed, we have no last_rcvd slot */
 104         if (req->rq_export->exp_failed) {
 105                 CERROR("committing transaction for disconnected client\n");
 106                 if (handle)
 107                         GOTO(out_commit, rc);
 108                 RETURN(rc);
 109         }
 110
 111         if (IS_ERR(handle))
 112                 RETURN(rc);
 113
 114         if (handle == NULL) {
 115                 /* if we're starting our own xaction, use our own inode */
 116                 inode = mds->mds_rcvd_filp->f_dentry->d_inode;
 117                 handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
 118                 if (IS_ERR(handle)) {
 119                         CERROR("fsfilt_start: %ld\n", PTR_ERR(handle));
 120                         RETURN(PTR_ERR(handle));
 121                 }
 122         }
 123
 124         off = med->med_off;
 125
 126         transno = req->rq_reqmsg->transno;
 127         if (rc != 0) {
 128                 LASSERTF(transno == 0, "BUG 3934, t"LPU64" rc %d\n", transno, rc);
 129         } else if (transno == 0) {
 130                 spin_lock(&mds->mds_transno_lock);
 131                 transno = ++mds->mds_last_transno;
 132                 spin_unlock(&mds->mds_transno_lock);
 133         } else {
 134                 spin_lock(&mds->mds_transno_lock);
 135                 if (transno > mds->mds_last_transno)
 136                         mds->mds_last_transno = transno;
 137                 spin_unlock(&mds->mds_transno_lock);
 138         }
 139         req->rq_repmsg->transno = req->rq_transno = transno;
 140         mcd->mcd_last_transno = cpu_to_le64(transno);
 141         mcd->mcd_last_xid = cpu_to_le64(req->rq_xid);
 142         mcd->mcd_last_result = cpu_to_le32(rc);
 143         mcd->mcd_last_data = cpu_to_le32(op_data);
 144
 145         fsfilt_add_journal_cb(obd, mds->mds_sb, transno, handle,
 146                               mds_commit_last_transno_cb, NULL);
 147
 148         err = fsfilt_write_record(obd, mds->mds_rcvd_filp, mcd,
 149                                   sizeof(*mcd), &off, 0);
 150
 151         if (err) {
 152                 log_pri = D_ERROR;
 153                 if (rc == 0)
 154                         rc = err;
 155         }
 156
 157         DEBUG_REQ(log_pri, req,
 158                   "wrote trans #"LPU64" client %s at idx %u: err = %d",
 159                   transno, mcd->mcd_uuid, med->med_idx, err);
 160
 161         err = mds_update_last_fid(obd, handle, 0);
 162         if (err) {
 163                 log_pri = D_ERROR;
 164                 if (rc == 0)
 165                         rc = err;
 166         }
 167
 168         err = mds_dt_write_objids(obd);
 169         if (err) {
 170                 log_pri = D_ERROR;
 171                 if (rc == 0)
 172                         rc = err;
 173         }
 174         CDEBUG(log_pri, "wrote objids: err = %d\n", err);
 175
 176         EXIT;
 177 out_commit:
 178         err = fsfilt_commit(obd, mds->mds_sb, inode, handle, 0);
 179         if (err) {
 180                 CERROR("error committing transaction: %d\n", err);
 181                 if (!rc)
 182                         rc = err;
 183         }
 184
 185         return rc;
 186 }
 187
 188 /* this gives the same functionality as the code between
 189  * sys_chmod and inode_setattr
 190  * chown_common and inode_setattr
 191  * utimes and inode_setattr
 192  */
 193 int mds_fix_attr(struct inode *inode, struct mds_update_record *rec)
 194 {
 195         time_t now = LTIME_S(CURRENT_TIME);
 196         struct iattr *attr = &rec->ur_iattr;
 197         unsigned int ia_valid = attr->ia_valid;
 198         int error;
 199         ENTRY;
 200
 201         /* only fix up attrs if the client VFS didn't already */
 202         if (!(ia_valid & ATTR_RAW))
 203                 RETURN(0);
 204
 205         if (!(ia_valid & ATTR_CTIME_SET))
 206                 LTIME_S(attr->ia_ctime) = now;
 207         if (!(ia_valid & ATTR_ATIME_SET))
 208                 LTIME_S(attr->ia_atime) = now;
 209         if (!(ia_valid & ATTR_MTIME_SET))
 210                 LTIME_S(attr->ia_mtime) = now;
 211
 212         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 213                 RETURN(-EPERM);
 214
 215         /* times */
 216         if ((ia_valid & (ATTR_MTIME|ATTR_ATIME)) == (ATTR_MTIME|ATTR_ATIME)) {
 217                 if (rec->ur_fsuid != inode->i_uid &&
 218                     (error = ll_permission(inode, MAY_WRITE, NULL)) != 0)
 219                         RETURN(error);
 220         }
 221
 222         if (ia_valid & ATTR_SIZE) {
 223                 if ((error = ll_permission(inode, MAY_WRITE, NULL)) != 0)
 224                         RETURN(error);
 225         }
 226
 227         if (ia_valid & ATTR_UID) {
 228                 /* chown */
 229                 error = -EPERM;
 230                 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 231                         RETURN(-EPERM);
 232                 if (attr->ia_uid == (uid_t) -1)
 233                         attr->ia_uid = inode->i_uid;
 234                 if (attr->ia_gid == (gid_t) -1)
 235                         attr->ia_gid = inode->i_gid;
 236                 attr->ia_mode = inode->i_mode;
 237                 /*
 238                  * If the user or group of a non-directory has been
 239                  * changed by a non-root user, remove the setuid bit.
 240                  * 19981026 David C Niemi <niemi@tux.org>
 241                  *
 242                  * Changed this to apply to all users, including root,
 243                  * to avoid some races. This is the behavior we had in
 244                  * 2.0. The check for non-root was definitely wrong
 245                  * for 2.2 anyway, as it should have been using
 246                  * CAP_FSETID rather than fsuid -- 19990830 SD.
 247                  */
 248                 if ((inode->i_mode & S_ISUID) == S_ISUID &&
 249                     !S_ISDIR(inode->i_mode)) {
 250                         attr->ia_mode &= ~S_ISUID;
 251                         attr->ia_valid |= ATTR_MODE;
 252                 }
 253                 /*
 254                  * Likewise, if the user or group of a non-directory
 255                  * has been changed by a non-root user, remove the
 256                  * setgid bit UNLESS there is no group execute bit
 257                  * (this would be a file marked for mandatory
 258                  * locking).  19981026 David C Niemi <niemi@tux.org>
 259                  *
 260                  * Removed the fsuid check (see the comment above) --
 261                  * 19990830 SD.
 262                  */
 263                 if (((inode->i_mode & (S_ISGID | S_IXGRP)) ==
 264                      (S_ISGID | S_IXGRP)) && !S_ISDIR(inode->i_mode)) {
 265                         attr->ia_mode &= ~S_ISGID;
 266                         attr->ia_valid |= ATTR_MODE;
 267                 }
 268         } else if (ia_valid & ATTR_MODE) {
 269                 int mode = attr->ia_mode;
 270                 /* chmod */
 271                 if (attr->ia_mode == (mode_t) -1)
 272                         attr->ia_mode = inode->i_mode;
 273                 attr->ia_mode =
 274                         (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
 275         }
 276         RETURN(0);
 277 }
 278
 279 void mds_steal_ack_locks(struct ptlrpc_request *req)
 280 {
 281         struct obd_export         *exp = req->rq_export;
 282         char                       str[PTL_NALFMT_SIZE];
 283         struct list_head          *tmp;
 284         struct ptlrpc_reply_state *oldrep;
 285         struct ptlrpc_service     *svc;
 286         struct llog_create_locks  *lcl;
 287         unsigned long              flags;
 288         int                        i;
 289
 290         /* CAVEAT EMPTOR: spinlock order */
 291         spin_lock_irqsave (&exp->exp_lock, flags);
 292         list_for_each (tmp, &exp->exp_outstanding_replies) {
 293                 oldrep = list_entry(tmp, struct ptlrpc_reply_state,rs_exp_list);
 294
 295                 if (oldrep->rs_xid != req->rq_xid)
 296                         continue;
 297
 298                 if (oldrep->rs_msg.opc != req->rq_reqmsg->opc)
 299                         CERROR ("Resent req xid "LPX64" has mismatched opc: "
 300                                 "new %d old %d\n", req->rq_xid,
 301                                 req->rq_reqmsg->opc, oldrep->rs_msg.opc);
 302
 303                 svc = oldrep->rs_srv_ni->sni_service;
 304                 spin_lock (&svc->srv_lock);
 305
 306                 list_del_init (&oldrep->rs_exp_list);
 307
 308                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
 309                       " o%d NID %s\n", oldrep->rs_nlocks, oldrep,
 310                       oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_msg.opc,
 311                       ptlrpc_peernid2str(&exp->exp_connection->c_peer, str));
 312
 313                 for (i = 0; i < oldrep->rs_nlocks; i++)
 314                         ptlrpc_save_lock(req,
 315                                          &oldrep->rs_locks[i],
 316                                          oldrep->rs_modes[i]);
 317                 oldrep->rs_nlocks = 0;
 318
 319                 lcl = oldrep->rs_llog_locks;
 320                 oldrep->rs_llog_locks = NULL;
 321                 if (lcl != NULL)
 322                         ptlrpc_save_llog_lock(req, lcl);
 323
 324                 DEBUG_REQ(D_HA, req, "stole locks for");
 325                 ptlrpc_schedule_difficult_reply (oldrep);
 326
 327                 spin_unlock (&svc->srv_lock);
 328                 spin_unlock_irqrestore (&exp->exp_lock, flags);
 329                 return;
 330         }
 331         spin_unlock_irqrestore (&exp->exp_lock, flags);
 332 }
 333
 334 void mds_req_from_mcd(struct ptlrpc_request *req, struct mds_client_data *mcd)
 335 {
 336         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
 337                   mcd->mcd_last_transno, mcd->mcd_last_result);
 338         req->rq_repmsg->transno = req->rq_transno = mcd->mcd_last_transno;
 339         req->rq_repmsg->status = req->rq_status = mcd->mcd_last_result;
 340
 341         mds_steal_ack_locks(req);
 342 }
 343
 344 static void reconstruct_reint_setattr(struct mds_update_record *rec,
 345                                       int offset, struct ptlrpc_request *req)
 346 {
 347         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 348         struct mds_body *body;
 349         struct dentry *de;
 350
 351         mds_req_from_mcd(req, med->med_mcd);
 352
 353         de = mds_id2dentry(req2obd(req), rec->ur_id1, NULL);
 354         if (IS_ERR(de)) {
 355                 LASSERT(PTR_ERR(de) == req->rq_status);
 356                 return;
 357         }
 358
 359         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
 360         mds_pack_inode2body(req2obd(req), body, de->d_inode, 0);
 361
 362         /* Don't return OST-specific attributes if we didn't just set them */
 363         if (rec->ur_iattr.ia_valid & ATTR_SIZE)
 364                 body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 365         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET))
 366                 body->valid |= OBD_MD_FLMTIME;
 367         if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET))
 368                 body->valid |= OBD_MD_FLATIME;
 369
 370         l_dput(de);
 371 }
 372
 373 /* In the raw-setattr case, we lock the child inode.
 374  * In the write-back case or if being called from open, the client holds a lock
 375  * already.
 376  *
 377  * We use the ATTR_FROM_OPEN flag to tell these cases apart. */
 378 static int mds_reint_setattr(struct mds_update_record *rec, int offset,
 379                              struct ptlrpc_request *req, struct lustre_handle *lh)
 380 {
 381         struct mds_obd *mds = mds_req2mds(req);
 382         struct obd_device *obd = req->rq_export->exp_obd;
 383         struct mds_body *body;
 384         struct dentry *de;
 385         struct inode *inode = NULL;
 386         struct lustre_handle lockh[2] = {{0}, {0}};
 387         int parent_mode;
 388         void *handle = NULL;
 389         struct mds_logcancel_data *mlcd = NULL;
 390         int rc = 0, cleanup_phase = 0, err;
 391         int locked = 0;
 392         ENTRY;
 393
 394         LASSERT(offset == 1);
 395
 396         DEBUG_REQ(D_INODE, req, "setattr "LPU64"/%u %x",
 397                   id_ino(rec->ur_id1), id_gen(rec->ur_id1),
 398                   rec->ur_iattr.ia_valid);
 399
 400         MDS_CHECK_RESENT(req, reconstruct_reint_setattr(rec, offset, req));
 401         MD_COUNTER_INCREMENT(obd, setattr);
 402
 403         if (rec->ur_iattr.ia_valid & ATTR_FROM_OPEN) {
 404                 de = mds_id2dentry(obd, rec->ur_id1, NULL);
 405                 if (IS_ERR(de))
 406                         GOTO(cleanup, rc = PTR_ERR(de));
 407         } else {
 408                 __u64 lockpart = MDS_INODELOCK_UPDATE;
 409                 if (rec->ur_iattr.ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID))
 410                         lockpart |= MDS_INODELOCK_LOOKUP;
 411                 de = mds_id2locked_dentry(obd, rec->ur_id1, NULL, LCK_PW,
 412                                           lockh, &parent_mode, NULL, 0, lockpart);
 413                 if (IS_ERR(de))
 414                         GOTO(cleanup, rc = PTR_ERR(de));
 415                 locked = 1;
 416         }
 417
 418         cleanup_phase = 1;
 419
 420         inode = de->d_inode;
 421         LASSERT(inode);
 422         if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 423             rec->ur_eadata != NULL)
 424                 down(&inode->i_sem);
 425
 426         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_SETATTR_WRITE, inode->i_sb);
 427
 428         handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
 429         if (IS_ERR(handle))
 430                 GOTO(cleanup, rc = PTR_ERR(handle));
 431
 432         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_CTIME))
 433                 CDEBUG(D_INODE, "setting mtime %lu, ctime %lu\n",
 434                        LTIME_S(rec->ur_iattr.ia_mtime),
 435                        LTIME_S(rec->ur_iattr.ia_ctime));
 436         rc = mds_fix_attr(inode, rec);
 437         if (rc)
 438                 GOTO(cleanup, rc);
 439
 440         if (rec->ur_iattr.ia_valid & ATTR_ATTR_FLAG)    /* ioctl */
 441                 rc = fsfilt_iocontrol(obd, inode, NULL, EXT3_IOC_SETFLAGS,
 442                                       (long)&rec->ur_iattr.ia_attr_flags);
 443         else                                            /* setattr */
 444                 rc = fsfilt_setattr(obd, de, handle, &rec->ur_iattr, 0);
 445
 446         if (rc == 0 && (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 447             rec->ur_eadata != NULL) {
 448                 struct lov_stripe_md *lsm = NULL;
 449
 450                 rc = ll_permission(inode, MAY_WRITE, NULL);
 451                 if (rc < 0)
 452                         GOTO(cleanup, rc);
 453
 454                 rc = obd_iocontrol(OBD_IOC_LOV_SETSTRIPE, mds->mds_dt_exp,
 455                                    0, &lsm, rec->ur_eadata);
 456                 if (rc)
 457                         GOTO(cleanup, rc);
 458
 459                 obd_free_memmd(mds->mds_dt_exp, &lsm);
 460
 461                 rc = fsfilt_set_md(obd, inode, handle, rec->ur_eadata,
 462                                    rec->ur_eadatalen);
 463                 if (rc)
 464                         GOTO(cleanup, rc);
 465         }
 466
 467         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 468         mds_pack_inode2body(obd, body, inode, 0);
 469         body->id1 = *rec->ur_id1;
 470
 471         /* Don't return OST-specific attributes if we didn't just set them */
 472         if (rec->ur_iattr.ia_valid & ATTR_SIZE)
 473                 body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 474         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET))
 475                 body->valid |= OBD_MD_FLMTIME;
 476         if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET))
 477                 body->valid |= OBD_MD_FLATIME;
 478
 479         if (rc == 0 && rec->ur_cookielen && !IS_ERR(mds->mds_dt_obd)) {
 480                 OBD_ALLOC(mlcd, sizeof(*mlcd) + rec->ur_cookielen +
 481                           rec->ur_eadatalen);
 482                 if (mlcd) {
 483                         mlcd->mlcd_size = sizeof(*mlcd) + rec->ur_cookielen +
 484                                 rec->ur_eadatalen;
 485                         mlcd->mlcd_eadatalen = rec->ur_eadatalen;
 486                         mlcd->mlcd_cookielen = rec->ur_cookielen;
 487                         mlcd->mlcd_lmm = (void *)&mlcd->mlcd_cookies +
 488                                 mlcd->mlcd_cookielen;
 489                         memcpy(&mlcd->mlcd_cookies, rec->ur_logcookies,
 490                                mlcd->mlcd_cookielen);
 491                         memcpy(mlcd->mlcd_lmm, rec->ur_eadata,
 492                                mlcd->mlcd_eadatalen);
 493                 } else {
 494                         CERROR("unable to allocate log cancel data\n");
 495                 }
 496         }
 497         EXIT;
 498  cleanup:
 499         if (mlcd != NULL)
 500                 fsfilt_add_journal_cb(req->rq_export->exp_obd, mds->mds_sb, 0,
 501                                       handle, mds_cancel_cookies_cb, mlcd);
 502         err = mds_finish_transno(mds, inode, handle, req, rc, 0);
 503         switch (cleanup_phase) {
 504         case 1:
 505                 if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 506                     rec->ur_eadata != NULL)
 507                         up(&inode->i_sem);
 508                 l_dput(de);
 509                 if (locked) {
 510 #ifdef S_PDIROPS
 511                         if (lockh[1].cookie != 0)
 512                                 ldlm_lock_decref(lockh + 1, parent_mode);
 513 #endif
 514                         if (rc) {
 515                                 ldlm_lock_decref(lockh, LCK_PW);
 516                         } else {
 517                                 ptlrpc_save_lock (req, lockh, LCK_PW);
 518                         }
 519                 }
 520         case 0:
 521                 break;
 522         default:
 523                 LBUG();
 524         }
 525         if (err && !rc)
 526                 rc = err;
 527
 528         req->rq_status = rc;
 529         return 0;
 530 }
 531
 532 static void reconstruct_reint_create(struct mds_update_record *rec, int offset,
 533                                      struct ptlrpc_request *req)
 534 {
 535         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 536         struct dentry *parent, *child;
 537         struct mds_body *body;
 538         ENTRY;
 539
 540         mds_req_from_mcd(req, med->med_mcd);
 541
 542         if (req->rq_status) {
 543                 EXIT;
 544                 return;
 545         }
 546
 547         parent = mds_id2dentry(req2obd(req), rec->ur_id1, NULL);
 548         LASSERT(!IS_ERR(parent));
 549         child = ll_lookup_one_len(rec->ur_name, parent,
 550                                   rec->ur_namelen - 1);
 551         LASSERT(!IS_ERR(child));
 552         if ((child->d_flags & DCACHE_CROSS_REF)) {
 553                 LASSERTF(child->d_inode == NULL, "BUG 3869\n");
 554                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
 555                 mds_pack_dentry2body(req2obd(req), body, child, 1);
 556         } else if (child->d_inode == NULL) {
 557                 DEBUG_REQ(D_ERROR, req, "parent "DLID4" name %s mode %o",
 558                           OLID4(rec->ur_id1), rec->ur_name, rec->ur_mode);
 559                 LASSERTF(child->d_inode != NULL, "BUG 3869\n");
 560         } else {
 561                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
 562                 mds_pack_inode2body(req2obd(req), body, child->d_inode, 1);
 563         }
 564         l_dput(parent);
 565         l_dput(child);
 566         EXIT;
 567 }
 568
 569 static int mds_reint_create(struct mds_update_record *rec, int offset,
 570                             struct ptlrpc_request *req,
 571                             struct lustre_handle *lh)
 572 {
 573         struct dentry *dparent = NULL;
 574         struct mds_obd *mds = mds_req2mds(req);
 575         struct obd_device *obd = req->rq_export->exp_obd;
 576         struct dentry *dchild = NULL;
 577         struct inode *dir = NULL;
 578         void *handle = NULL;
 579         struct lustre_handle lockh[2] = {{0}, {0}};
 580         int parent_mode;
 581         int rc = 0, err, type = rec->ur_mode & S_IFMT, cleanup_phase = 0;
 582         int created = 0;
 583         struct dentry_params dp;
 584         struct mea *mea = NULL;
 585         int mea_size;
 586         ENTRY;
 587
 588         LASSERT(offset == 1);
 589
 590         LASSERT(!strcmp(req->rq_export->exp_obd->obd_type->typ_name,
 591                         LUSTRE_MDS_NAME));
 592
 593         DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u name %s mode %o",
 594                   id_ino(rec->ur_id1), id_gen(rec->ur_id1),
 595                   rec->ur_name, rec->ur_mode);
 596
 597         MDS_CHECK_RESENT(req, reconstruct_reint_create(rec, offset, req));
 598
 599         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_CREATE))
 600                 GOTO(cleanup, rc = -ESTALE);
 601
 602         dparent = mds_id2locked_dentry(obd, rec->ur_id1, NULL, LCK_PW,
 603                                        lockh, &parent_mode, rec->ur_name,
 604                                        rec->ur_namelen - 1, MDS_INODELOCK_UPDATE);
 605         if (IS_ERR(dparent)) {
 606                 rc = PTR_ERR(dparent);
 607                 CERROR("parent lookup error %d\n", rc);
 608                 GOTO(cleanup, rc);
 609         }
 610         cleanup_phase = 1; /* locked parent dentry */
 611         dir = dparent->d_inode;
 612         LASSERT(dir);
 613
 614         ldlm_lock_dump_handle(D_OTHER, lockh);
 615
 616         /* try to retrieve MEA data for this dir */
 617         rc = mds_md_get_attr(obd, dparent->d_inode, &mea, &mea_size);
 618         if (rc)
 619                 GOTO(cleanup, rc);
 620
 621         if (mea != NULL) {
 622                 /*
 623                  * dir is already splitted, check is requested filename should
 624                  * live at this MDS or at another one.
 625                  */
 626                 int i = mea_name2idx(mea, rec->ur_name, rec->ur_namelen - 1);
 627                 if (mea->mea_master != id_group(&mea->mea_ids[i])) {
 628                         CDEBUG(D_OTHER, "inapropriate MDS(%d) for %lu/%u:%s."
 629                                " should be %lu(%d)\n",
 630                                mea->mea_master, dparent->d_inode->i_ino,
 631                                dparent->d_inode->i_generation, rec->ur_name,
 632                                (unsigned long)id_group(&mea->mea_ids[i]), i);
 633                         GOTO(cleanup, rc = -ERESTART);
 634                 }
 635         }
 636
 637         dchild = ll_lookup_one_len(rec->ur_name, dparent,
 638                                    rec->ur_namelen - 1);
 639         if (IS_ERR(dchild)) {
 640                 rc = PTR_ERR(dchild);
 641                 CERROR("Can't find "DLID4"/%s, error %d\n",
 642                        OLID4(rec->ur_id1), rec->ur_name, rc);
 643                 GOTO(cleanup, rc);
 644         }
 645
 646         cleanup_phase = 2; /* child dentry */
 647
 648         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_CREATE_WRITE, dir->i_sb);
 649
 650         if (type == S_IFREG || type == S_IFDIR) {
 651                 rc = mds_try_to_split_dir(obd, dparent, &mea, 0, parent_mode);
 652                 CDEBUG(D_OTHER, "%s: splitted %lu/%u - %d/%d\n",
 653                        obd->obd_name, dparent->d_inode->i_ino,
 654                        dparent->d_inode->i_generation, rc, parent_mode);
 655                 if (rc > 0) {
 656                         /* dir got splitted */
 657                         GOTO(cleanup, rc = -ERESTART);
 658                 } else if (rc < 0) {
 659                         /* error happened during spitting. */
 660                         GOTO(cleanup, rc);
 661                 }
 662         }
 663
 664         if (dir->i_mode & S_ISGID) {
 665                 if (S_ISDIR(rec->ur_mode))
 666                         rec->ur_mode |= S_ISGID;
 667         }
 668
 669         /*
 670          * here inode number should be used only in the case of replaying. It is
 671          * needed to check if object already created in the case of creating
 672          * remote inode.
 673          */
 674         dchild->d_fsdata = (void *)&dp;
 675         dp.p_inum = (unsigned long)id_ino(rec->ur_id2);
 676         dp.p_ptr = req;
 677
 678         switch (type) {
 679         case S_IFREG:{
 680                 handle = fsfilt_start(obd, dir, FSFILT_OP_CREATE, NULL);
 681                 if (IS_ERR(handle))
 682                         GOTO(cleanup, rc = PTR_ERR(handle));
 683                 rc = ll_vfs_create(dir, dchild, rec->ur_mode, NULL);
 684                 EXIT;
 685                 break;
 686         }
 687         case S_IFDIR:{
 688                 int i, nstripes = 0;
 689
 690                 /*
 691                  * as Peter asked, mkdir() should distribute new directories
 692                  * over the whole cluster in order to distribute namespace
 693                  * processing load. first, we calculate which MDS to use to put
 694                  * new directory's inode in.
 695                  */
 696                 i = mds_choose_mdsnum(obd, rec->ur_name, rec->ur_namelen - 1,
 697                                       rec->ur_flags);
 698                 if (i == mds->mds_num) {
 699                         /* inode will be created locally */
 700                         handle = fsfilt_start(obd, dir, FSFILT_OP_MKDIR, NULL);
 701                         if (IS_ERR(handle))
 702                                 GOTO(cleanup, rc = PTR_ERR(handle));
 703
 704                         rc = vfs_mkdir(dir, dchild, rec->ur_mode);
 705                         if (rc) {
 706                                 CERROR("Can't create dir %s, rc = %d\n",
 707                                        dchild->d_name.name, rc);
 708                                 GOTO(cleanup, rc);
 709                         }
 710
 711                         down(&dchild->d_inode->i_sem);
 712                         if (dp.p_inum) {
 713                                 rc = mds_update_inode_sid(obd, dchild->d_inode,
 714                                                           handle, rec->ur_id2);
 715                                 if (rc) {
 716                                         CERROR("mds_update_inode_sid() failed, inode %lu, "
 717                                                "rc %d\n", dchild->d_inode->i_ino, rc);
 718                                 }
 719
 720                                 /*
 721                                  * make sure, that fid is up-to-date.
 722                                  */
 723                                 mds_set_last_fid(obd, id_fid(rec->ur_id2));
 724                         } else {
 725                                 rc = mds_alloc_inode_sid(obd, dchild->d_inode,
 726                                                          handle, NULL);
 727                                 if (rc) {
 728                                         CERROR("mds_alloc_inode_sid() failed, inode %lu, "
 729                                                "rc %d\n", dchild->d_inode->i_ino, rc);
 730                                 }
 731                         }
 732                         up(&dchild->d_inode->i_sem);
 733
 734                         if (rc)
 735                                 GOTO(cleanup, rc);
 736
 737                         if (rec->ur_eadata)
 738                                 nstripes = *(u16 *)rec->ur_eadata;
 739
 740                         if (rc == 0 && nstripes) {
 741                                 /*
 742                                  * we pass LCK_EX to split routine to signal,
 743                                  * that we have exclusive access to the
 744                                  * directory. Simple because nobody knows it
 745                                  * already exists -bzzz
 746                                  */
 747                                 rc = mds_try_to_split_dir(obd, dchild,
 748                                                           NULL, nstripes,
 749                                                           LCK_EX);
 750                                 if (rc > 0) {
 751                                         /* dir got splitted */
 752                                         rc = 0;
 753                                 } else if (rc < 0) {
 754                                         /* an error occured during
 755                                          * splitting. */
 756                                         GOTO(cleanup, rc);
 757                                 }
 758                         }
 759                 } else if (!DENTRY_VALID(dchild)) {
 760                         /* inode will be created on another MDS */
 761                         struct obdo *oa = NULL;
 762                         struct mds_body *body;
 763
 764                         /* first, create that inode */
 765                         oa = obdo_alloc();
 766                         if (!oa)
 767                                 GOTO(cleanup, rc = -ENOMEM);
 768
 769                         oa->o_mds = i;
 770                         oa->o_easize = 0;
 771
 772                         if (rec->ur_eadata) {
 773                                 /* user asks for creating splitted dir */
 774                                 oa->o_easize = *((u16 *) rec->ur_eadata);
 775                         }
 776
 777                         obdo_from_inode(oa, dir, OBD_MD_FLTYPE | OBD_MD_FLATIME |
 778                                         OBD_MD_FLMTIME | OBD_MD_FLCTIME |
 779                                         OBD_MD_FLUID | OBD_MD_FLGID);
 780
 781                         oa->o_mode = dir->i_mode;
 782
 783                         CDEBUG(D_OTHER, "%s: create dir on MDS %u\n",
 784                                obd->obd_name, i);
 785
 786                         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
 787                                 /*
 788                                  * here inode number and generation are
 789                                  * important, as this is replay request and we
 790                                  * need them to check if such an object is
 791                                  * already created.
 792                                  */
 793                                 CDEBUG(D_HA, "%s: replay dir creation %*s -> %u/%u\n",
 794                                        obd->obd_name, rec->ur_namelen - 1,
 795                                        rec->ur_name, (unsigned)id_ino(rec->ur_id2),
 796                                        (unsigned)id_gen(rec->ur_id2));
 797                                 oa->o_id = id_ino(rec->ur_id2);
 798                                 oa->o_fid = id_fid(rec->ur_id2);
 799                                 oa->o_generation = id_gen(rec->ur_id2);
 800                                 oa->o_flags |= OBD_FL_RECREATE_OBJS;
 801
 802                                 /*
 803                                  * fid should be defined here. It should be
 804                                  * passedfrom client.
 805                                  */
 806                                 LASSERT(oa->o_fid != 0);
 807                         }
 808
 809                         /*
 810                          * before obd_create() is called, o_fid is not known if
 811                          * this is not recovery of cause.
 812                          */
 813                         rc = obd_create(mds->mds_md_exp, oa, NULL, NULL);
 814                         if (rc) {
 815                                 CERROR("can't create remote inode: %d\n", rc);
 816                                 DEBUG_REQ(D_ERROR, req, "parent "LPU64"/%u name %s mode %o",
 817                                           id_ino(rec->ur_id1), id_gen(rec->ur_id1),
 818                                           rec->ur_name, rec->ur_mode);
 819                                 obdo_free(oa);
 820                                 GOTO(cleanup, rc);
 821                         }
 822
 823                         LASSERT(oa->o_fid != 0);
 824
 825                         /* now, add new dir entry for it */
 826                         handle = fsfilt_start(obd, dir, FSFILT_OP_MKDIR, NULL);
 827                         if (IS_ERR(handle)) {
 828                                 obdo_free(oa);
 829                                 GOTO(cleanup, rc = PTR_ERR(handle));
 830                         }
 831
 832                         /* creating local dentry for remote inode. */
 833                         rc = fsfilt_add_dir_entry(obd, dparent, rec->ur_name,
 834                                                   rec->ur_namelen - 1, oa->o_id,
 835                                                   oa->o_generation, i, oa->o_fid);
 836
 837                         if (rc) {
 838                                 CERROR("Can't create local entry %*s for "
 839                                        "remote inode.\n", rec->ur_namelen - 1,
 840                                         rec->ur_name);
 841                                 GOTO(cleanup, rc);
 842                         }
 843
 844                         /* fill reply */
 845                         body = lustre_msg_buf(req->rq_repmsg,
 846                                               0, sizeof(*body));
 847                         body->valid |= OBD_MD_FLID | OBD_MD_MDS;
 848
 849                         obdo2id(&body->id1, oa);
 850                         obdo_free(oa);
 851                 } else {
 852                         /* requested name exists in the directory */
 853                         rc = -EEXIST;
 854                 }
 855                 EXIT;
 856                 break;
 857         }
 858         case S_IFLNK:{
 859                 handle = fsfilt_start(obd, dir, FSFILT_OP_SYMLINK, NULL);
 860                 if (IS_ERR(handle))
 861                         GOTO(cleanup, rc = PTR_ERR(handle));
 862                 if (rec->ur_tgt == NULL)        /* no target supplied */
 863                         rc = -EINVAL;           /* -EPROTO? */
 864                 else
 865                         rc = ll_vfs_symlink(dir, dchild, rec->ur_tgt, S_IALLUGO);
 866                 EXIT;
 867                 break;
 868         }
 869         case S_IFCHR:
 870         case S_IFBLK:
 871         case S_IFIFO:
 872         case S_IFSOCK:{
 873                 int rdev = rec->ur_rdev;
 874                 handle = fsfilt_start(obd, dir, FSFILT_OP_MKNOD, NULL);
 875                 if (IS_ERR(handle))
 876                         GOTO(cleanup, (handle = NULL, rc = PTR_ERR(handle)));
 877                 rc = vfs_mknod(dir, dchild, rec->ur_mode, rdev);
 878                 EXIT;
 879                 break;
 880         }
 881         default:
 882                 CERROR("bad file type %o creating %s\n", type, rec->ur_name);
 883                 dchild->d_fsdata = NULL;
 884                 GOTO(cleanup, rc = -EINVAL);
 885         }
 886
 887         /* In case we stored the desired inum in here, we want to clean up. */
 888         if (dchild->d_fsdata == (void *)(unsigned long)id_ino(rec->ur_id2))
 889                 dchild->d_fsdata = NULL;
 890
 891         if (rc) {
 892                 CDEBUG(D_INODE, "error during create: %d\n", rc);
 893                 GOTO(cleanup, rc);
 894         } else if (dchild->d_inode) {
 895                 struct iattr iattr;
 896                 struct mds_body *body;
 897                 struct inode *inode = dchild->d_inode;
 898
 899                 created = 1;
 900                 iattr.ia_uid = rec->ur_fsuid;
 901                 LTIME_S(iattr.ia_atime) = rec->ur_time;
 902                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
 903                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
 904
 905                 if (dir->i_mode & S_ISGID)
 906                         iattr.ia_gid = dir->i_gid;
 907                 else
 908                         iattr.ia_gid = rec->ur_fsgid;
 909
 910                 iattr.ia_valid = ATTR_UID | ATTR_GID | ATTR_ATIME |
 911                         ATTR_MTIME | ATTR_CTIME;
 912
 913                 if (id_ino(rec->ur_id2)) {
 914                         LASSERT(id_ino(rec->ur_id2) == inode->i_ino);
 915                         inode->i_generation = id_gen(rec->ur_id2);
 916
 917                         if (type != S_IFDIR) {
 918                                 /*
 919                                  * updating inode self id, as inode already
 920                                  * exists and we should make sure, its sid will
 921                                  * be the same as we reveived.
 922                                  */
 923                                 down(&inode->i_sem);
 924                                 rc = mds_update_inode_sid(obd, inode,
 925                                                           handle, rec->ur_id2);
 926                                 up(&inode->i_sem);
 927                                 if (rc) {
 928                                         CERROR("Can't update inode self id, "
 929                                                "rc = %d.\n", rc);
 930                                 }
 931
 932                                 /*
 933                                  * make sure, that fid is up-to-date.
 934                                  */
 935                                 mds_set_last_fid(obd, id_fid(rec->ur_id2));
 936                         }
 937
 938                         /* dirtied and committed by the upcoming setattr. */
 939                         CDEBUG(D_INODE, "recreated ino %lu with gen %u\n",
 940                                inode->i_ino, inode->i_generation);
 941                 } else {
 942                         struct lustre_handle child_ino_lockh;
 943
 944                         CDEBUG(D_INODE, "created ino %lu with gen %x\n",
 945                                inode->i_ino, inode->i_generation);
 946
 947                         if (type != S_IFDIR) {
 948                                 /*
 949                                  * allocate new id for @inode if it is not dir,
 950                                  * because for dir it was already done.
 951                                  */
 952                                 down(&inode->i_sem);
 953                                 rc = mds_alloc_inode_sid(obd, inode,
 954                                                          handle, NULL);
 955                                 up(&inode->i_sem);
 956                                 if (rc) {
 957                                         CERROR("mds_alloc_inode_sid() failed, "
 958                                                "inode %lu, rc %d\n", inode->i_ino,
 959                                                rc);
 960                                 }
 961                         }
 962
 963                         if (rc == 0) {
 964                                 /*
 965                                  * the inode we were allocated may have just
 966                                  * been freed by an unlink operation.  We take
 967                                  * this lock to synchronize against the matching
 968                                  * reply-ack-lock taken in unlink, to avoid
 969                                  * replay problems if this reply makes it out to
 970                                  * the client but the unlink's does not.  See
 971                                  * bug 2029 for more detail.
 972                                  */
 973                                 rc = mds_lock_new_child(obd, inode, &child_ino_lockh);
 974                                 if (rc != ELDLM_OK) {
 975                                         CERROR("error locking for unlink/create sync: "
 976                                                "%d\n", rc);
 977                                 } else {
 978                                         ldlm_lock_decref(&child_ino_lockh, LCK_EX);
 979                                 }
 980                         }
 981                 }
 982
 983                 rc = fsfilt_setattr(obd, dchild, handle, &iattr, 0);
 984                 if (rc)
 985                         CERROR("error on child setattr: rc = %d\n", rc);
 986
 987                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
 988                 rc = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
 989                 if (rc)
 990                         CERROR("error on parent setattr: rc = %d\n", rc);
 991                 else
 992                         MD_COUNTER_INCREMENT(obd, create);
 993
 994                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*body));
 995                 mds_pack_inode2body(obd, body, inode, 1);
 996         }
 997
 998         EXIT;
 999 cleanup:
1000         err = mds_finish_transno(mds, dir, handle, req, rc, 0);
1001
1002         if (rc && created) {
1003                 /* Destroy the file we just created. This should not need extra
1004                  * journal credits, as we have already modified all of the
1005                  * blocks needed in order to create the file in the first
1006                  * place. */
1007                 switch (type) {
1008                 case S_IFDIR:
1009                         err = vfs_rmdir(dir, dchild);
1010                         if (err)
1011                                 CERROR("rmdir in error path: %d\n", err);
1012                         break;
1013                 default:
1014                         err = vfs_unlink(dir, dchild);
1015                         if (err)
1016                                 CERROR("unlink in error path: %d\n", err);
1017                         break;
1018                 }
1019         } else {
1020                 rc = err;
1021         }
1022         switch (cleanup_phase) {
1023         case 2: /* child dentry */
1024                 l_dput(dchild);
1025         case 1: /* locked parent dentry */
1026 #ifdef S_PDIROPS
1027                 if (lockh[1].cookie != 0)
1028                         ldlm_lock_decref(lockh + 1, parent_mode);
1029 #endif
1030                 if (rc) {
1031                         ldlm_lock_decref(lockh, LCK_PW);
1032                 } else {
1033                         ptlrpc_save_lock(req, lockh, LCK_PW);
1034                 }
1035                 l_dput(dparent);
1036         case 0:
1037                 break;
1038         default:
1039                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1040                 LBUG();
1041         }
1042         if (mea)
1043                 OBD_FREE(mea, mea_size);
1044         req->rq_status = rc;
1045         return 0;
1046 }
1047
1048 static inline int
1049 res_gt(struct ldlm_res_id *res1, struct ldlm_res_id *res2,
1050        ldlm_policy_data_t *p1, ldlm_policy_data_t *p2)
1051 {
1052         int i;
1053
1054         for (i = 0; i < RES_NAME_SIZE; i++) {
1055                 /*
1056                  * this is needed to make zeroed res_id entries to be put at the
1057                  * end of list in *ordered_locks() .
1058                  */
1059                 if (res1->name[i] == 0 && res2->name[i] != 0)
1060                         return 1;
1061                 if (res2->name[i] == 0 && res1->name[i] != 0)
1062                         return 0;
1063                 if (res1->name[i] > res2->name[i])
1064                         return 1;
1065                 if (res1->name[i] < res2->name[i])
1066                         return 0;
1067         }
1068
1069         if (!p1 || !p2)
1070                 return 0;
1071
1072         if (memcmp(p1, p2, sizeof(*p1)) < 0)
1073                 return 1;
1074
1075         return 0;
1076 }
1077
1078 /* This function doesn't use ldlm_match_or_enqueue because we're always called
1079  * with EX or PW locks, and the MDS is no longer allowed to match write locks,
1080  * because they take the place of local semaphores.
1081  *
1082  * One or two locks are taken in numerical order.  A res_id->name[0] of 0 means
1083  * no lock is taken for that res_id.  Must be at least one non-zero res_id. */
1084 int enqueue_ordered_locks(struct obd_device *obd, struct ldlm_res_id *p1_res_id,
1085                           struct lustre_handle *p1_lockh, int p1_lock_mode,
1086                           ldlm_policy_data_t *p1_policy,
1087                           struct ldlm_res_id *p2_res_id,
1088                           struct lustre_handle *p2_lockh, int p2_lock_mode,
1089                           ldlm_policy_data_t *p2_policy)
1090 {
1091         int lock_modes[2] = { p1_lock_mode, p2_lock_mode };
1092         struct ldlm_res_id *res_id[2] = { p1_res_id, p2_res_id };
1093         struct lustre_handle *handles[2] = { p1_lockh, p2_lockh };
1094         ldlm_policy_data_t *policies[2] = { p1_policy, p2_policy };
1095         int rc, flags;
1096         ENTRY;
1097
1098         LASSERT(p1_res_id != NULL && p2_res_id != NULL);
1099
1100         CDEBUG(D_INFO, "locks before: "LPU64"/"LPU64"\n",
1101                res_id[0]->name[0], res_id[1]->name[0]);
1102
1103         if (res_gt(p1_res_id, p2_res_id, p1_policy, p2_policy)) {
1104                 handles[1] = p1_lockh;
1105                 handles[0] = p2_lockh;
1106                 res_id[1] = p1_res_id;
1107                 res_id[0] = p2_res_id;
1108                 lock_modes[1] = p1_lock_mode;
1109                 lock_modes[0] = p2_lock_mode;
1110                 policies[1] = p1_policy;
1111                 policies[0] = p2_policy;
1112         }
1113
1114         CDEBUG(D_DLMTRACE, "lock order: "LPU64"/"LPU64"\n",
1115                res_id[0]->name[0], res_id[1]->name[0]);
1116
1117         flags = LDLM_FL_LOCAL_ONLY;
1118         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, *res_id[0],
1119                               LDLM_IBITS, policies[0], lock_modes[0], &flags,
1120                               mds_blocking_ast, ldlm_completion_ast, NULL, NULL,
1121                               NULL, 0, NULL, handles[0]);
1122         if (rc != ELDLM_OK)
1123                 RETURN(-EIO);
1124         ldlm_lock_dump_handle(D_OTHER, handles[0]);
1125
1126         if (!memcmp(res_id[0], res_id[1], sizeof(*res_id[0])) &&
1127             (policies[0]->l_inodebits.bits & policies[1]->l_inodebits.bits)) {
1128                 memcpy(handles[1], handles[0], sizeof(*(handles[1])));
1129                 ldlm_lock_addref(handles[1], lock_modes[1]);
1130         } else if (res_id[1]->name[0] != 0) {
1131                 flags = LDLM_FL_LOCAL_ONLY;
1132                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1133                                       *res_id[1], LDLM_IBITS, policies[1],
1134                                       lock_modes[1], &flags, mds_blocking_ast,
1135                                       ldlm_completion_ast, NULL, NULL, NULL, 0,
1136                                       NULL, handles[1]);
1137                 if (rc != ELDLM_OK) {
1138                         ldlm_lock_decref(handles[0], lock_modes[0]);
1139                         RETURN(-EIO);
1140                 }
1141                 ldlm_lock_dump_handle(D_OTHER, handles[1]);
1142         }
1143
1144         RETURN(0);
1145 }
1146
1147 int enqueue_4ordered_locks(struct obd_device *obd,struct ldlm_res_id *p1_res_id,
1148                            struct lustre_handle *p1_lockh, int p1_lock_mode,
1149                            ldlm_policy_data_t *p1_policy,
1150                            struct ldlm_res_id *p2_res_id,
1151                            struct lustre_handle *p2_lockh, int p2_lock_mode,
1152                            ldlm_policy_data_t *p2_policy,
1153                            struct ldlm_res_id *c1_res_id,
1154                            struct lustre_handle *c1_lockh, int c1_lock_mode,
1155                            ldlm_policy_data_t *c1_policy,
1156                            struct ldlm_res_id *c2_res_id,
1157                            struct lustre_handle *c2_lockh, int c2_lock_mode,
1158                            ldlm_policy_data_t *c2_policy)
1159 {
1160         struct ldlm_res_id *res_id[5] = { p1_res_id, p2_res_id,
1161                                           c1_res_id, c2_res_id };
1162         struct lustre_handle *dlm_handles[5] = { p1_lockh, p2_lockh,
1163                                                  c1_lockh, c2_lockh };
1164         int lock_modes[5] = { p1_lock_mode, p2_lock_mode,
1165                               c1_lock_mode, c2_lock_mode };
1166         ldlm_policy_data_t *policies[5] = { p1_policy, p2_policy,
1167                                             c1_policy, c2_policy};
1168         int rc, i, j, sorted, flags;
1169         ENTRY;
1170
1171         CDEBUG(D_DLMTRACE, "locks before: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n",
1172                res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0],
1173                res_id[3]->name[0]);
1174
1175         /*
1176          * simple insertion sort - we have at most 4 elements. Note, that zeroed
1177          * res_id should be at the end of list after sorting is finished.
1178          */
1179         for (i = 1; i < 4; i++) {
1180                 j = i - 1;
1181                 dlm_handles[4] = dlm_handles[i];
1182                 res_id[4] = res_id[i];
1183                 lock_modes[4] = lock_modes[i];
1184                 policies[4] = policies[i];
1185
1186                 sorted = 0;
1187                 do {
1188                         if (res_gt(res_id[j], res_id[4], policies[j],
1189                                    policies[4])) {
1190                                 dlm_handles[j + 1] = dlm_handles[j];
1191                                 res_id[j + 1] = res_id[j];
1192                                 lock_modes[j + 1] = lock_modes[j];
1193                                 policies[j + 1] = policies[j];
1194                                 j--;
1195                         } else {
1196                                 sorted = 1;
1197                         }
1198                 } while (j >= 0 && !sorted);
1199
1200                 dlm_handles[j + 1] = dlm_handles[4];
1201                 res_id[j + 1] = res_id[4];
1202                 lock_modes[j + 1] = lock_modes[4];
1203                 policies[j + 1] = policies[4];
1204         }
1205
1206         CDEBUG(D_DLMTRACE, "lock order: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n",
1207                res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0],
1208                res_id[3]->name[0]);
1209
1210         /* XXX we could send ASTs on all these locks first before blocking? */
1211         for (i = 0; i < 4; i++) {
1212                 flags = 0;
1213
1214                 /*
1215                  * nevertheless zeroed res_ids should be at the end of list, and
1216                  * could use break here, I think, that it is more correctly for
1217                  * clear understanding of code to have continue here, as it
1218                  * clearly means, that zeroed res_id should be skipped and does
1219                  * not mean, that if we meet zeroed res_id we should stop
1220                  * locking loop.
1221                  */
1222                 if (res_id[i]->name[0] == 0)
1223                         continue;
1224
1225                 if (i != 0 &&
1226                     !memcmp(res_id[i], res_id[i-1], sizeof(*res_id[i])) &&
1227                     (policies[i]->l_inodebits.bits &
1228                      policies[i-1]->l_inodebits.bits) ) {
1229                         memcpy(dlm_handles[i], dlm_handles[i-1],
1230                                sizeof(*(dlm_handles[i])));
1231                         ldlm_lock_addref(dlm_handles[i], lock_modes[i]);
1232                 } else {
1233                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1234                                               *res_id[i], LDLM_IBITS,
1235                                               policies[i],
1236                                               lock_modes[i], &flags,
1237                                               mds_blocking_ast,
1238                                               ldlm_completion_ast, NULL, NULL,
1239                                               NULL, 0, NULL, dlm_handles[i]);
1240                         if (rc != ELDLM_OK)
1241                                 GOTO(out_err, rc = -EIO);
1242                         ldlm_lock_dump_handle(D_OTHER, dlm_handles[i]);
1243                 }
1244         }
1245
1246         RETURN(0);
1247 out_err:
1248         while (i-- > 0)
1249                 ldlm_lock_decref(dlm_handles[i], lock_modes[i]);
1250
1251         return rc;
1252 }
1253
1254 /* In the unlikely case that the child changed while we were waiting
1255  * on the lock, we need to drop the lock on the old child and either:
1256  * - if the child has a lower resource name, then we have to also
1257  *   drop the parent lock and regain the locks in the right order
1258  * - in the rename case, if the child has a lower resource name than one of
1259  *   the other parent/child resources (maxres) we also need to reget the locks
1260  * - if the child has a higher resource name (this is the common case)
1261  *   we can just get the lock on the new child (still in lock order)
1262  *
1263  * Returns 0 if the child did not change or if it changed but could be locked.
1264  * Returns 1 if the child changed and we need to re-lock (no locks held).
1265  * Returns -ve error with a valid dchild (no locks held). */
1266 static int mds_verify_child(struct obd_device *obd,
1267                             struct ldlm_res_id *parent_res_id,
1268                             struct lustre_handle *parent_lockh,
1269                             struct dentry *dparent, int parent_mode,
1270                             struct ldlm_res_id *child_res_id,
1271                             struct lustre_handle *child_lockh,
1272                             struct dentry **dchildp, int child_mode,
1273                             ldlm_policy_data_t *child_policy,
1274                             const char *name, int namelen,
1275                             struct ldlm_res_id *maxres,
1276                             unsigned long child_ino,
1277                             __u32 child_gen)
1278 {
1279         struct lustre_id sid;
1280         struct dentry *vchild, *dchild = *dchildp;
1281         int rc = 0, cleanup_phase = 2; /* parent, child locks */
1282         ENTRY;
1283
1284         vchild = ll_lookup_one_len(name, dparent, namelen - 1);
1285         if (IS_ERR(vchild))
1286                 GOTO(cleanup, rc = PTR_ERR(vchild));
1287
1288         if ((vchild->d_flags & DCACHE_CROSS_REF)) {
1289                 if (child_gen == vchild->d_generation &&
1290                     child_ino == vchild->d_inum) {
1291                         if (dchild)
1292                                 l_dput(dchild);
1293                         *dchildp = vchild;
1294                         RETURN(0);
1295                 }
1296                 goto changed;
1297         }
1298
1299         if (likely((vchild->d_inode == NULL && child_res_id->name[0] == 0) ||
1300                    (vchild->d_inode != NULL &&
1301                     child_gen == vchild->d_inode->i_generation &&
1302                     child_ino == vchild->d_inode->i_ino))) {
1303                 if (dchild)
1304                         l_dput(dchild);
1305                 *dchildp = vchild;
1306                 RETURN(0);
1307         }
1308
1309 changed:
1310         CDEBUG(D_DLMTRACE, "child inode changed: %p != %p (%lu != "LPU64")\n",
1311                vchild->d_inode, dchild ? dchild->d_inode : 0,
1312                vchild->d_inode ? vchild->d_inode->i_ino : 0,
1313                child_res_id->name[0]);
1314
1315         if (child_res_id->name[0] != 0)
1316                 ldlm_lock_decref(child_lockh, child_mode);
1317         if (dchild)
1318                 l_dput(dchild);
1319
1320         cleanup_phase = 1; /* parent lock only */
1321         *dchildp = dchild = vchild;
1322
1323         if (dchild->d_inode || (dchild->d_flags & DCACHE_CROSS_REF)) {
1324                 int flags = 0;
1325
1326                 if (dchild->d_inode) {
1327                         down(&dchild->d_inode->i_sem);
1328                         rc = mds_read_inode_sid(obd, dchild->d_inode, &sid);
1329                         up(&dchild->d_inode->i_sem);
1330                         if (rc) {
1331                                 CERROR("Can't read inode self id, inode %lu,"
1332                                        " rc %d\n",  dchild->d_inode->i_ino, rc);
1333                                 GOTO(cleanup, rc);
1334                         }
1335                         child_res_id->name[0] = id_fid(&sid);
1336                         child_res_id->name[1] = id_group(&sid);
1337                 } else {
1338                         child_res_id->name[0] = dchild->d_fid;
1339                         child_res_id->name[1] = dchild->d_mdsnum;
1340                 }
1341
1342                 if (res_gt(parent_res_id, child_res_id, NULL, NULL) ||
1343                     res_gt(maxres, child_res_id, NULL, NULL)) {
1344                         CDEBUG(D_DLMTRACE, "relock "LPU64"<("LPU64"|"LPU64")\n",
1345                                child_res_id->name[0], parent_res_id->name[0],
1346                                maxres->name[0]);
1347                         GOTO(cleanup, rc = 1);
1348                 }
1349
1350                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1351                                       *child_res_id, LDLM_IBITS, child_policy,
1352                                       child_mode, &flags, mds_blocking_ast,
1353                                       ldlm_completion_ast, NULL, NULL, NULL, 0,
1354                                       NULL, child_lockh);
1355                 if (rc != ELDLM_OK)
1356                         GOTO(cleanup, rc = -EIO);
1357
1358         } else {
1359                 memset(child_res_id, 0, sizeof(*child_res_id));
1360         }
1361
1362         EXIT;
1363 cleanup:
1364         if (rc) {
1365                 switch(cleanup_phase) {
1366                 case 2:
1367                         if (child_res_id->name[0] != 0)
1368                                 ldlm_lock_decref(child_lockh, child_mode);
1369                 case 1:
1370                         ldlm_lock_decref(parent_lockh, parent_mode);
1371                 }
1372         }
1373         return rc;
1374 }
1375
1376 int mds_get_parent_child_locked(struct obd_device *obd, struct mds_obd *mds,
1377                                 struct lustre_id *id,
1378                                 struct lustre_handle *parent_lockh,
1379                                 struct dentry **dparentp, int parent_mode,
1380                                 __u64 parent_lockpart, int *update_mode,
1381                                 char *name, int namelen,
1382                                 struct lustre_handle *child_lockh,
1383                                 struct dentry **dchildp, int child_mode,
1384                                 __u64 child_lockpart)
1385 {
1386         ldlm_policy_data_t parent_policy = {.l_inodebits = { parent_lockpart }};
1387         ldlm_policy_data_t child_policy = {.l_inodebits = { child_lockpart }};
1388         struct ldlm_res_id parent_res_id = { .name = {0} };
1389         struct ldlm_res_id child_res_id = { .name = {0} };
1390         int rc = 0, cleanup_phase = 0;
1391         unsigned long child_ino;
1392         struct lustre_id sid;
1393         __u32 child_gen = 0;
1394         struct inode *inode;
1395         ENTRY;
1396
1397         /* Step 1: Lookup parent */
1398         *dparentp = mds_id2dentry(obd, id, NULL);
1399         if (IS_ERR(*dparentp)) {
1400                 rc = PTR_ERR(*dparentp);
1401                 *dparentp = NULL;
1402                 RETURN(rc);
1403         }
1404
1405         CDEBUG(D_INODE, "parent ino %lu, name %s\n",
1406                (*dparentp)->d_inode->i_ino, name);
1407
1408         parent_res_id.name[0] = id_fid(id);
1409         parent_res_id.name[1] = id_group(id);
1410
1411 #ifdef S_PDIROPS
1412         parent_lockh[1].cookie = 0;
1413         if (name && IS_PDIROPS((*dparentp)->d_inode)) {
1414                 struct ldlm_res_id res_id = { .name = {0} };
1415                 ldlm_policy_data_t policy;
1416                 int flags = 0;
1417
1418                 *update_mode = mds_lock_mode_for_dir(obd, *dparentp, parent_mode);
1419                 if (*update_mode) {
1420                         res_id.name[0] = id_fid(id);
1421                         res_id.name[1] = id_group(id);
1422                         policy.l_inodebits.bits = MDS_INODELOCK_UPDATE;
1423
1424                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1425                                               res_id, LDLM_IBITS, &policy,
1426                                               *update_mode, &flags,
1427                                               mds_blocking_ast,
1428                                               ldlm_completion_ast,
1429                                               NULL, NULL, NULL, 0, NULL,
1430                                               parent_lockh + 1);
1431                         if (rc != ELDLM_OK)
1432                                 RETURN(-ENOLCK);
1433                 }
1434
1435                 parent_res_id.name[2] = full_name_hash(name, namelen - 1);
1436
1437                 CDEBUG(D_INFO, "take lock on %lu:%lu:"LPX64"\n",
1438                        (unsigned long)id_fid(id), (unsigned long)id_group(id),
1439                        parent_res_id.name[2]);
1440         }
1441 #endif
1442
1443         cleanup_phase = 1; /* parent dentry */
1444
1445         /* Step 2: Lookup child (without DLM lock, to get resource name) */
1446         *dchildp = ll_lookup_one_len(name, *dparentp, namelen - 1);
1447         if (IS_ERR(*dchildp)) {
1448                 rc = PTR_ERR(*dchildp);
1449                 CDEBUG(D_INODE, "child lookup error %d\n", rc);
1450                 GOTO(cleanup, rc);
1451         }
1452
1453         if ((*dchildp)->d_flags & DCACHE_CROSS_REF) {
1454                 /*
1455                  * inode lives on another MDS: return * fid/mdsnum and LOOKUP
1456                  * lock. Drop possible UPDATE lock!
1457                  */
1458                 child_policy.l_inodebits.bits &= ~MDS_INODELOCK_UPDATE;
1459                 child_policy.l_inodebits.bits |= MDS_INODELOCK_LOOKUP;
1460
1461                 child_res_id.name[0] = (*dchildp)->d_fid;
1462                 child_res_id.name[1] = (*dchildp)->d_mdsnum;
1463                 child_gen = (*dchildp)->d_generation;
1464                 child_ino = (*dchildp)->d_inum;
1465                 goto retry_locks;
1466         }
1467
1468         inode = (*dchildp)->d_inode;
1469         if (inode != NULL)
1470                 inode = igrab(inode);
1471         if (inode == NULL)
1472                 goto retry_locks;
1473
1474         down(&inode->i_sem);
1475         rc = mds_read_inode_sid(obd, inode, &sid);
1476         up(&inode->i_sem);
1477         if (rc) {
1478                 CERROR("Can't read inode self id, inode %lu, "
1479                        "rc %d\n", inode->i_ino, rc);
1480                 iput(inode);
1481                 GOTO(cleanup, rc);
1482         }
1483
1484         child_res_id.name[0] = id_fid(&sid);
1485         child_res_id.name[1] = id_group(&sid);
1486         child_gen = inode->i_generation;
1487         child_ino = inode->i_ino;
1488         iput(inode);
1489
1490 retry_locks:
1491         cleanup_phase = 2; /* child dentry */
1492
1493         /* Step 3: Lock parent and child in resource order.  If child doesn't
1494          * exist, we still have to lock the parent and re-lookup. */
1495         rc = enqueue_ordered_locks(obd, &parent_res_id, parent_lockh, parent_mode,
1496                                    &parent_policy, &child_res_id, child_lockh,
1497                                    child_mode, &child_policy);
1498         if (rc)
1499                 GOTO(cleanup, rc);
1500
1501         if ((*dchildp)->d_inode || ((*dchildp)->d_flags & DCACHE_CROSS_REF))
1502                 cleanup_phase = 4; /* child lock */
1503         else
1504                 cleanup_phase = 3; /* parent lock */
1505
1506         /* Step 4: Re-lookup child to verify it hasn't changed since locking */
1507         rc = mds_verify_child(obd, &parent_res_id, parent_lockh, *dparentp,
1508                               parent_mode, &child_res_id, child_lockh,
1509                               dchildp, child_mode, &child_policy,
1510                               name, namelen, &parent_res_id,
1511                               child_ino, child_gen);
1512         if (rc > 0)
1513                 goto retry_locks;
1514         if (rc < 0) {
1515                 cleanup_phase = 3;
1516                 GOTO(cleanup, rc);
1517         }
1518
1519         EXIT;
1520 cleanup:
1521         if (rc) {
1522                 switch (cleanup_phase) {
1523                 case 4:
1524                         ldlm_lock_decref(child_lockh, child_mode);
1525                 case 3:
1526                         ldlm_lock_decref(parent_lockh, parent_mode);
1527                 case 2:
1528                         l_dput(*dchildp);
1529                 case 1:
1530 #ifdef S_PDIROPS
1531                         if (parent_lockh[1].cookie)
1532                                 ldlm_lock_decref(parent_lockh + 1, *update_mode);
1533 #endif
1534                         l_dput(*dparentp);
1535                 }
1536         }
1537         return rc;
1538 }
1539
1540 void mds_reconstruct_generic(struct ptlrpc_request *req)
1541 {
1542         struct mds_export_data *med = &req->rq_export->exp_mds_data;
1543         mds_req_from_mcd(req, med->med_mcd);
1544 }
1545
1546 /* If we are unlinking an open file/dir (i.e. creating an orphan) then
1547  * we instead link the inode into the PENDING directory until it is
1548  * finally released.  We can't simply call mds_reint_rename() or some
1549  * part thereof, because we don't have the inode to check for link
1550  * count/open status until after it is locked.
1551  *
1552  * For lock ordering, caller must get child->i_sem first, then pending->i_sem
1553  * before starting journal transaction.
1554  *
1555  * returns 1 on success
1556  * returns 0 if we lost a race and didn't make a new link
1557  * returns negative on error
1558  */
1559 static int mds_orphan_add_link(struct mds_update_record *rec,
1560                                struct obd_device *obd, struct dentry *dentry)
1561 {
1562         struct mds_obd *mds = &obd->u.mds;
1563         struct inode *pending_dir = mds->mds_pending_dir->d_inode;
1564         struct inode *inode = dentry->d_inode;
1565         struct dentry *pending_child;
1566         char idname[LL_ID_NAMELEN];
1567         int idlen = 0, rc, mode;
1568         ENTRY;
1569
1570         LASSERT(inode != NULL);
1571         LASSERT(!mds_inode_is_orphan(inode));
1572 #ifndef HAVE_I_ALLOC_SEM
1573         LASSERT(down_trylock(&inode->i_sem) != 0);
1574 #endif
1575         LASSERT(down_trylock(&pending_dir->i_sem) != 0);
1576
1577         idlen = ll_id2str(idname, inode->i_ino, inode->i_generation);
1578
1579         CDEBUG(D_INODE, "pending destroy of %dx open %d linked %s %s = %s\n",
1580                mds_orphan_open_count(inode), inode->i_nlink,
1581                S_ISDIR(inode->i_mode) ? "dir" :
1582                S_ISREG(inode->i_mode) ? "file" : "other",
1583                rec->ur_name, idname);
1584
1585         if (mds_orphan_open_count(inode) == 0 || inode->i_nlink != 0)
1586                 RETURN(0);
1587
1588         pending_child = lookup_one_len(idname, mds->mds_pending_dir, idlen);
1589         if (IS_ERR(pending_child))
1590                 RETURN(PTR_ERR(pending_child));
1591
1592         if (pending_child->d_inode != NULL) {
1593                 CERROR("re-destroying orphan file %s?\n", rec->ur_name);
1594                 LASSERT(pending_child->d_inode == inode);
1595                 GOTO(out_dput, rc = 0);
1596         }
1597
1598         /* link() is semanticaly-wrong for S_IFDIR, so we set S_IFREG
1599          * for linking and return real mode back then -bzzz */
1600         mode = inode->i_mode;
1601         inode->i_mode = S_IFREG;
1602         rc = vfs_link(dentry, pending_dir, pending_child);
1603         if (rc)
1604                 CERROR("error linking orphan %s to PENDING: rc = %d\n",
1605                        rec->ur_name, rc);
1606         else
1607                 mds_inode_set_orphan(inode);
1608
1609         /* return mode and correct i_nlink if inode is directory */
1610         inode->i_mode = mode;
1611         LASSERTF(inode->i_nlink == 1, "%s nlink == %d\n",
1612                  S_ISDIR(mode) ? "dir" : S_ISREG(mode) ? "file" : "other",
1613                  inode->i_nlink);
1614         if (S_ISDIR(mode)) {
1615                 inode->i_nlink++;
1616                 pending_dir->i_nlink++;
1617                 mark_inode_dirty(inode);
1618                 mark_inode_dirty(pending_dir);
1619         }
1620
1621         EXIT;
1622 out_dput:
1623         l_dput(pending_child);
1624         return rc;
1625 }
1626
1627 int mds_create_local_dentry(struct mds_update_record *rec,
1628                             struct obd_device *obd)
1629 {
1630         struct mds_obd *mds = &obd->u.mds;
1631         struct inode *id_dir = mds->mds_id_dir->d_inode;
1632         int idlen = 0, rc, cleanup_phase = 0;
1633         struct dentry *new_child = NULL;
1634         char *idname = rec->ur_name;
1635         struct dentry *child = NULL;
1636         struct lustre_handle lockh[2] = {{0}, {0}};
1637         struct lustre_id sid;
1638         void *handle;
1639         ENTRY;
1640
1641         down(&id_dir->i_sem);
1642         idlen = ll_id2str(idname, id_ino(rec->ur_id1),
1643                           id_gen(rec->ur_id1));
1644
1645         CDEBUG(D_OTHER, "look for local dentry '%s' for "DLID4"\n",
1646                idname, OLID4(rec->ur_id1));
1647
1648         new_child = ll_lookup_one_len(idname, mds->mds_id_dir,
1649                                       idlen);
1650         up(&id_dir->i_sem);
1651         if (IS_ERR(new_child)) {
1652                 CERROR("can't lookup %s: %d\n", idname,
1653                        (int) PTR_ERR(new_child));
1654                 GOTO(cleanup, rc = PTR_ERR(new_child));
1655         }
1656         cleanup_phase = 1;
1657
1658         down(&id_dir->i_sem);
1659         rc = mds_read_inode_sid(obd, id_dir, &sid);
1660         up(&id_dir->i_sem);
1661         if (rc) {
1662                 CERROR("Can't read inode self id, inode %lu, "
1663                        "rc %d\n", id_dir->i_ino, rc);
1664                 GOTO(cleanup, rc);
1665         }
1666
1667         if (new_child->d_inode != NULL) {
1668                 /* nice. we've already have local dentry! */
1669                 CDEBUG(D_OTHER, "found dentry in FIDS/: %u/%u\n",
1670                        (unsigned)new_child->d_inode->i_ino,
1671                        (unsigned)new_child->d_inode->i_generation);
1672
1673                 id_ino(rec->ur_id1) = id_dir->i_ino;
1674                 id_gen(rec->ur_id1) = id_dir->i_generation;
1675                 rec->ur_namelen = idlen + 1;
1676
1677                 id_fid(rec->ur_id1) = id_fid(&sid);
1678                 id_group(rec->ur_id1) = id_group(&sid);
1679
1680                 GOTO(cleanup, rc = 0);
1681         }
1682
1683         /* new, local dentry will be added soon. we need no aliases here */
1684         d_drop(new_child);
1685
1686         if (rec->ur_mode & MDS_MODE_DONT_LOCK) {
1687                 child = mds_id2dentry(obd, rec->ur_id1, NULL);
1688         } else {
1689                 child = mds_id2locked_dentry(obd, rec->ur_id1, NULL,
1690                                              LCK_EX, lockh, NULL, NULL, 0,
1691                                              MDS_INODELOCK_UPDATE);
1692         }
1693
1694         if (IS_ERR(child)) {
1695                 rc = PTR_ERR(child);
1696                 if (rc != -ENOENT || !(rec->ur_mode & MDS_MODE_REPLAY))
1697                         CERROR("can't get victim: %d\n", rc);
1698                 GOTO(cleanup, rc);
1699         }
1700         cleanup_phase = 2;
1701
1702         handle = fsfilt_start(obd, id_dir, FSFILT_OP_LINK, NULL);
1703         if (IS_ERR(handle))
1704                 GOTO(cleanup, rc = PTR_ERR(handle));
1705
1706         rc = fsfilt_add_dir_entry(obd, mds->mds_id_dir, idname,
1707                                   idlen, id_ino(rec->ur_id1),
1708                                   id_gen(rec->ur_id1), mds->mds_num,
1709                                   id_fid(rec->ur_id1));
1710         if (rc)
1711                 CERROR("error linking orphan %lu/%lu to FIDS: rc = %d\n",
1712                        (unsigned long)child->d_inode->i_ino,
1713                        (unsigned long)child->d_inode->i_generation, rc);
1714         else {
1715                 if (S_ISDIR(child->d_inode->i_mode)) {
1716                         id_dir->i_nlink++;
1717                         mark_inode_dirty(id_dir);
1718                 }
1719                 mark_inode_dirty(child->d_inode);
1720         }
1721         fsfilt_commit(obd, mds->mds_sb, id_dir, handle, 0);
1722
1723         id_ino(rec->ur_id1) = id_dir->i_ino;
1724         id_gen(rec->ur_id1) = id_dir->i_generation;
1725         rec->ur_namelen = idlen + 1;
1726
1727         id_fid(rec->ur_id1) = id_fid(&sid);
1728         id_group(rec->ur_id1) = id_group(&sid);
1729
1730         EXIT;
1731 cleanup:
1732         switch(cleanup_phase) {
1733                 case 2:
1734                         if (!(rec->ur_mode & MDS_MODE_DONT_LOCK))
1735                                 ldlm_lock_decref(lockh, LCK_EX);
1736                         dput(child);
1737                 case 1:
1738                         dput(new_child);
1739                 case 0:
1740                        break;
1741         }
1742         return rc;
1743 }
1744
1745 static int mds_copy_unlink_reply(struct ptlrpc_request *master,
1746                                  struct ptlrpc_request *slave)
1747 {
1748         void *cookie, *cookie2;
1749         struct mds_body *body2;
1750         struct mds_body *body;
1751         void *ea, *ea2;
1752         ENTRY;
1753
1754         body = lustre_msg_buf(slave->rq_repmsg, 0, sizeof(*body));
1755         LASSERT(body != NULL);
1756
1757         body2 = lustre_msg_buf(master->rq_repmsg, 0, sizeof (*body));
1758         LASSERT(body2 != NULL);
1759
1760         if (!(body->valid & (OBD_MD_FLID | OBD_MD_FLGENER)))
1761                 RETURN(0);
1762
1763         memcpy(body2, body, sizeof(*body));
1764         body2->valid &= ~OBD_MD_FLCOOKIE;
1765
1766         if (!(body->valid & OBD_MD_FLEASIZE) &&
1767             !(body->valid & OBD_MD_FLDIREA))
1768                 RETURN(0);
1769
1770         if (body->eadatasize == 0) {
1771                 CERROR("OBD_MD_FLEASIZE set but eadatasize zero\n");
1772                 RETURN(0);
1773         }
1774
1775         LASSERT(master->rq_repmsg->buflens[1] >= body->eadatasize);
1776
1777         ea = lustre_msg_buf(slave->rq_repmsg, 1, body->eadatasize);
1778         LASSERT(ea != NULL);
1779
1780         ea2 = lustre_msg_buf(master->rq_repmsg, 1, body->eadatasize);
1781         LASSERT(ea2 != NULL);
1782
1783         memcpy(ea2, ea, body->eadatasize);
1784
1785         if (body->valid & OBD_MD_FLCOOKIE) {
1786                 LASSERT(master->rq_repmsg->buflens[2] >=
1787                                 slave->rq_repmsg->buflens[2]);
1788                 cookie = lustre_msg_buf(slave->rq_repmsg, 2,
1789                                 slave->rq_repmsg->buflens[2]);
1790                 LASSERT(cookie != NULL);
1791
1792                 cookie2 = lustre_msg_buf(master->rq_repmsg, 2,
1793                                 master->rq_repmsg->buflens[2]);
1794                 LASSERT(cookie2 != NULL);
1795                 memcpy(cookie2, cookie, slave->rq_repmsg->buflens[2]);
1796                 body2->valid |= OBD_MD_FLCOOKIE;
1797         }
1798         RETURN(0);
1799 }
1800
1801 static int mds_reint_unlink_remote(struct mds_update_record *rec,
1802                                    int offset, struct ptlrpc_request *req,
1803                                    struct lustre_handle *parent_lockh,
1804                                    int update_mode, struct dentry *dparent,
1805                                    struct lustre_handle *child_lockh,
1806                                    struct dentry *dchild)
1807 {
1808         struct obd_device *obd = req->rq_export->exp_obd;
1809         struct mds_obd *mds = mds_req2mds(req);
1810         struct ptlrpc_request *request = NULL;
1811         int rc = 0, cleanup_phase = 0;
1812         struct mdc_op_data *op_data;
1813         void *handle;
1814         ENTRY;
1815
1816         LASSERT(offset == 1 || offset == 3);
1817
1818         /* time to drop i_nlink on remote MDS */
1819         OBD_ALLOC(op_data, sizeof(*op_data));
1820         if (op_data == NULL)
1821                 RETURN(-ENOMEM);
1822
1823         memset(op_data, 0, sizeof(*op_data));
1824         mds_pack_dentry2id(obd, &op_data->id1, dchild, 1);
1825         op_data->create_mode = rec->ur_mode;
1826
1827         DEBUG_REQ(D_INODE, req, "unlink %*s (remote inode "DLID4")",
1828                   rec->ur_namelen - 1, rec->ur_name, OLID4(&op_data->id1));
1829
1830         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1831                 DEBUG_REQ(D_HA, req, "unlink %*s (remote inode "DLID4")",
1832                           rec->ur_namelen - 1, rec->ur_name, OLID4(&op_data->id1));
1833         }
1834
1835         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1836                 op_data->create_mode |= MDS_MODE_REPLAY;
1837
1838         rc = md_unlink(mds->mds_md_exp, op_data, &request);
1839         OBD_FREE(op_data, sizeof(*op_data));
1840         cleanup_phase = 2;
1841
1842         if (request) {
1843                 if (rc == 0)
1844                         mds_copy_unlink_reply(req, request);
1845                 ptlrpc_req_finished(request);
1846         }
1847
1848         if (rc == 0) {
1849                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_RMDIR,
1850                                       NULL);
1851                 if (IS_ERR(handle))
1852                         GOTO(cleanup, rc = PTR_ERR(handle));
1853                 rc = fsfilt_del_dir_entry(req->rq_export->exp_obd, dchild);
1854                 rc = mds_finish_transno(mds, dparent->d_inode, handle, req,
1855                                         rc, 0);
1856         }
1857         EXIT;
1858 cleanup:
1859         req->rq_status = rc;
1860
1861 #ifdef S_PDIROPS
1862         if (parent_lockh[1].cookie != 0)
1863                 ldlm_lock_decref(parent_lockh + 1, update_mode);
1864 #endif
1865         ldlm_lock_decref(child_lockh, LCK_EX);
1866         if (rc)
1867                 ldlm_lock_decref(parent_lockh, LCK_PW);
1868         else
1869                 ptlrpc_save_lock(req, parent_lockh, LCK_PW);
1870         l_dput(dchild);
1871         l_dput(dparent);
1872
1873         return 0;
1874 }
1875
1876 static int mds_reint_unlink(struct mds_update_record *rec, int offset,
1877                             struct ptlrpc_request *req,
1878                             struct lustre_handle *lh)
1879 {
1880         struct dentry *dparent = NULL, *dchild;
1881         struct mds_obd *mds = mds_req2mds(req);
1882         struct obd_device *obd = req->rq_export->exp_obd;
1883         struct mds_body *body = NULL;
1884         struct inode *child_inode = NULL;
1885         struct lustre_handle parent_lockh[2] = {{0}, {0}};
1886         struct lustre_handle child_lockh = {0};
1887         struct lustre_handle child_reuse_lockh = {0};
1888         struct lustre_handle *slave_lockh = NULL;
1889         char idname[LL_ID_NAMELEN];
1890         struct llog_create_locks *lcl = NULL;
1891         void *handle = NULL;
1892         int rc = 0, cleanup_phase = 0;
1893         int unlink_by_id = 0;
1894         int update_mode;
1895         ENTRY;
1896
1897         LASSERT(offset == 1 || offset == 3);
1898
1899         DEBUG_REQ(D_INODE, req, "parent ino "LPU64"/%u, child %s",
1900                   id_ino(rec->ur_id1), id_gen(rec->ur_id1),
1901                   rec->ur_name);
1902
1903         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1904
1905         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1906                 DEBUG_REQ(D_HA, req, "unlink replay");
1907                 LASSERT(offset == 1); /* should not come from intent */
1908                 memcpy(lustre_msg_buf(req->rq_repmsg, 2, 0),
1909                        lustre_msg_buf(req->rq_reqmsg, offset + 2, 0),
1910                        req->rq_repmsg->buflens[2]);
1911         }
1912
1913         MD_COUNTER_INCREMENT(obd, unlink);
1914
1915         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNLINK))
1916                 GOTO(cleanup, rc = -ENOENT);
1917
1918         if (rec->ur_namelen == 1) {
1919                 /* this is request to drop i_nlink on local inode */
1920                 unlink_by_id = 1;
1921                 rec->ur_name = idname;
1922                 rc = mds_create_local_dentry(rec, obd);
1923                 if (rc == -ENOENT || (rec->ur_mode & MDS_MODE_REPLAY)) {
1924                         DEBUG_REQ(D_HA, req,
1925                                   "drop nlink on inode "DLID4" (replay)",
1926                                   OLID4(rec->ur_id1));
1927                         req->rq_status = 0;
1928                         RETURN(0);
1929                 }
1930         }
1931
1932         if (rec->ur_mode & MDS_MODE_DONT_LOCK) {
1933                 /* master mds for directory asks slave removing inode is already
1934                  * locked */
1935                 dparent = mds_id2locked_dentry(obd, rec->ur_id1, NULL,
1936                                                LCK_PW, parent_lockh,
1937                                                &update_mode, rec->ur_name,
1938                                                rec->ur_namelen,
1939                                                MDS_INODELOCK_UPDATE);
1940                 if (IS_ERR(dparent))
1941                         GOTO(cleanup, rc = PTR_ERR(dparent));
1942                 dchild = ll_lookup_one_len(rec->ur_name, dparent,
1943                                            rec->ur_namelen - 1);
1944                 if (IS_ERR(dchild))
1945                         GOTO(cleanup, rc = PTR_ERR(dchild));
1946                 child_lockh.cookie = 0;
1947                 LASSERT(!(dchild->d_flags & DCACHE_CROSS_REF));
1948                 LASSERT(dchild->d_inode != NULL);
1949                 LASSERT(S_ISDIR(dchild->d_inode->i_mode));
1950         } else {
1951                 rc = mds_get_parent_child_locked(obd, mds, rec->ur_id1,
1952                                                  parent_lockh, &dparent,
1953                                                  LCK_PW, MDS_INODELOCK_UPDATE,
1954                                                  &update_mode, rec->ur_name,
1955                                                  rec->ur_namelen, &child_lockh,
1956                                                  &dchild, LCK_EX,
1957                                                  MDS_INODELOCK_LOOKUP |
1958                                                  MDS_INODELOCK_UPDATE);
1959         }
1960         if (rc)
1961                 GOTO(cleanup, rc);
1962
1963         if (dchild->d_flags & DCACHE_CROSS_REF) {
1964                 /* we should have parent lock only here */
1965                 LASSERT(unlink_by_id == 0);
1966                 LASSERT(dchild->d_mdsnum != mds->mds_num);
1967                 mds_reint_unlink_remote(rec, offset, req, parent_lockh,
1968                                         update_mode, dparent, &child_lockh, dchild);
1969                 RETURN(0);
1970         }
1971
1972         cleanup_phase = 1; /* dchild, dparent, locks */
1973
1974         dget(dchild);
1975         child_inode = dchild->d_inode;
1976         if (child_inode == NULL) {
1977                 CDEBUG(D_INODE, "child doesn't exist (dir %lu, name %s)\n",
1978                        dparent ? dparent->d_inode->i_ino : 0, rec->ur_name);
1979                 GOTO(cleanup, rc = -ENOENT);
1980         }
1981
1982         cleanup_phase = 2; /* dchild has a lock */
1983
1984         /* We have to do these checks ourselves, in case we are making an
1985          * orphan.  The client tells us whether rmdir() or unlink() was called,
1986          * so we need to return appropriate errors (bug 72).
1987          *
1988          * We don't have to check permissions, because vfs_rename (called from
1989          * mds_open_unlink_rename) also calls may_delete. */
1990         if ((rec->ur_mode & S_IFMT) == S_IFDIR) {
1991                 if (!S_ISDIR(child_inode->i_mode))
1992                         GOTO(cleanup, rc = -ENOTDIR);
1993         } else {
1994                 if (S_ISDIR(child_inode->i_mode))
1995                         GOTO(cleanup, rc = -EISDIR);
1996         }
1997
1998         /* handle splitted dir */
1999         rc = mds_lock_slave_objs(obd, dchild, &slave_lockh);
2000         if (rc)
2001                 GOTO(cleanup, rc);
2002
2003         /* Step 4: Get a lock on the ino to sync with creation WRT inode
2004          * reuse (see bug 2029). */
2005         rc = mds_lock_new_child(obd, child_inode, &child_reuse_lockh);
2006         if (rc != ELDLM_OK)
2007                 GOTO(cleanup, rc);
2008         cleanup_phase = 3; /* child inum lock */
2009
2010         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_UNLINK_WRITE, dparent->d_inode->i_sb);
2011
2012         /* ldlm_reply in buf[0] if called via intent */
2013         if (offset == 3)
2014                 offset = 1;
2015         else
2016                 offset = 0;
2017
2018         body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
2019         LASSERT(body != NULL);
2020
2021         /* child i_alloc_sem protects orphan_dec_test && is_orphan race */
2022         DOWN_READ_I_ALLOC_SEM(child_inode);
2023         cleanup_phase = 4; /* up(&child_inode->i_sem) when finished */
2024
2025         /* If this is potentially the last reference to this inode, get the
2026          * OBD EA data first so the client can destroy OST objects.  We
2027          * only do the object removal later if no open files/links remain. */
2028         if ((S_ISDIR(child_inode->i_mode) && child_inode->i_nlink == 2) ||
2029             child_inode->i_nlink == 1) {
2030                 if (mds_orphan_open_count(child_inode) > 0) {
2031                         /* need to lock pending_dir before transaction */
2032                         down(&mds->mds_pending_dir->d_inode->i_sem);
2033                         cleanup_phase = 5; /* up(&pending_dir->i_sem) */
2034                 } else if (S_ISREG(child_inode->i_mode)) {
2035                         mds_pack_inode2body(obd, body, child_inode, 0);
2036                         mds_pack_md(obd, req->rq_repmsg, offset + 1,
2037                                     body, child_inode, MDS_PACK_MD_LOCK);
2038                 }
2039         }
2040
2041         /* Step 4: Do the unlink: we already verified ur_mode above (bug 72) */
2042         switch (child_inode->i_mode & S_IFMT) {
2043         case S_IFDIR:
2044                 /* Drop any lingering child directories before we start our
2045                  * transaction, to avoid doing multiple inode dirty/delete
2046                  * in our compound transaction (bug 1321). */
2047                 shrink_dcache_parent(dchild);
2048                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_RMDIR,
2049                                       NULL);
2050                 if (IS_ERR(handle))
2051                         GOTO(cleanup, rc = PTR_ERR(handle));
2052                 rc = vfs_rmdir(dparent->d_inode, dchild);
2053                 break;
2054         case S_IFREG: {
2055 #warning "optimization is possible here: we could drop nlink w/o removing local dentry in FIDS/"
2056                 struct lov_mds_md *lmm = lustre_msg_buf(req->rq_repmsg,
2057                                                         offset + 1, 0);
2058                 handle = fsfilt_start_log(obd, dparent->d_inode,
2059                                           FSFILT_OP_UNLINK, NULL,
2060                                           le32_to_cpu(lmm->lmm_stripe_count));
2061                 if (IS_ERR(handle))
2062                         GOTO(cleanup, rc = PTR_ERR(handle));
2063                 rc = vfs_unlink(dparent->d_inode, dchild);
2064                 break;
2065         }
2066         case S_IFLNK:
2067         case S_IFCHR:
2068         case S_IFBLK:
2069         case S_IFIFO:
2070         case S_IFSOCK:
2071                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK,
2072                                       NULL);
2073                 if (IS_ERR(handle))
2074                         GOTO(cleanup, rc = PTR_ERR(handle));
2075                 rc = vfs_unlink(dparent->d_inode, dchild);
2076                 break;
2077         default:
2078                 CERROR("bad file type %o unlinking %s\n", rec->ur_mode,
2079                        rec->ur_name);
2080                 LBUG();
2081                 GOTO(cleanup, rc = -EINVAL);
2082         }
2083
2084         if (rc == 0 && child_inode->i_nlink == 0) {
2085                 if (mds_orphan_open_count(child_inode) > 0)
2086                         rc = mds_orphan_add_link(rec, obd, dchild);
2087
2088                 if (rc == 1)
2089                         GOTO(cleanup, rc = 0);
2090
2091                 if (!S_ISREG(child_inode->i_mode))
2092                         GOTO(cleanup, rc);
2093
2094                 if (!(body->valid & OBD_MD_FLEASIZE)) {
2095                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
2096                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
2097                 } else if (mds_log_op_unlink(obd, child_inode,
2098                                 lustre_msg_buf(req->rq_repmsg, offset + 1, 0),
2099                                         req->rq_repmsg->buflens[offset + 1],
2100                                 lustre_msg_buf(req->rq_repmsg, offset + 2, 0),
2101                                         req->rq_repmsg->buflens[offset+2],
2102                                 &lcl) > 0){
2103                         body->valid |= OBD_MD_FLCOOKIE;
2104                 }
2105         }
2106
2107         GOTO(cleanup, rc);
2108
2109 cleanup:
2110         if (rc == 0) {
2111                 struct iattr iattr;
2112                 int err;
2113
2114                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
2115                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
2116                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
2117
2118                 err = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
2119                 if (err)
2120                         CERROR("error on parent setattr: rc = %d\n", err);
2121         }
2122         rc = mds_finish_transno(mds, dparent ? dparent->d_inode : NULL,
2123                                 handle, req, rc, 0);
2124         if (!rc)
2125                 (void)obd_set_info(mds->mds_dt_exp, strlen("unlinked"),
2126                                    "unlinked", 0, NULL);
2127         switch(cleanup_phase) {
2128         case 5: /* pending_dir semaphore */
2129                 up(&mds->mds_pending_dir->d_inode->i_sem);
2130         case 4: /* child inode semaphore */
2131                 UP_READ_I_ALLOC_SEM(child_inode);
2132                  /* handle splitted dir */
2133                 if (rc == 0) {
2134                         /* master directory can be non-empty or something else ... */
2135                         mds_unlink_slave_objs(obd, dchild);
2136                 }
2137                 if (lcl != NULL)
2138                         ptlrpc_save_llog_lock(req, lcl);
2139         case 3: /* child ino-reuse lock */
2140                 if (rc && body != NULL) {
2141                         // Don't unlink the OST objects if the MDS unlink failed
2142                         body->valid = 0;
2143                 }
2144                 if (rc)
2145                         ldlm_lock_decref(&child_reuse_lockh, LCK_EX);
2146                 else
2147                         ptlrpc_save_lock(req, &child_reuse_lockh, LCK_EX);
2148         case 2: /* child lock */
2149                 mds_unlock_slave_objs(obd, dchild, slave_lockh);
2150                 if (child_lockh.cookie)
2151                         ldlm_lock_decref(&child_lockh, LCK_EX);
2152         case 1: /* child and parent dentry, parent lock */
2153 #ifdef S_PDIROPS
2154                 if (parent_lockh[1].cookie != 0)
2155                         ldlm_lock_decref(parent_lockh + 1, update_mode);
2156 #endif
2157                 if (rc)
2158                         ldlm_lock_decref(parent_lockh, LCK_PW);
2159                 else
2160                         ptlrpc_save_lock(req, parent_lockh, LCK_PW);
2161                 l_dput(dchild);
2162                 l_dput(dchild);
2163                 l_dput(dparent);
2164         case 0:
2165                 break;
2166         default:
2167                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2168                 LBUG();
2169         }
2170         req->rq_status = rc;
2171         return 0;
2172 }
2173
2174 /*
2175  * to service requests from remote MDS to increment i_nlink
2176  */
2177 static int mds_reint_link_acquire(struct mds_update_record *rec,
2178                                   int offset, struct ptlrpc_request *req,
2179                                   struct lustre_handle *lh)
2180 {
2181         struct obd_device *obd = req->rq_export->exp_obd;
2182         struct ldlm_res_id src_res_id = { .name = {0} };
2183         struct lustre_handle *handle = NULL, src_lockh = {0};
2184         struct mds_obd *mds = mds_req2mds(req);
2185         int rc = 0, cleanup_phase = 0;
2186         struct dentry *de_src = NULL;
2187         ldlm_policy_data_t policy;
2188         int flags = 0;
2189         ENTRY;
2190
2191         DEBUG_REQ(D_INODE, req, "%s: request to acquire i_nlinks "DLID4"\n",
2192                   obd->obd_name, OLID4(rec->ur_id1));
2193
2194         /* Step 1: Lookup the source inode and target directory by ID */
2195         de_src = mds_id2dentry(obd, rec->ur_id1, NULL);
2196         if (IS_ERR(de_src))
2197                 GOTO(cleanup, rc = PTR_ERR(de_src));
2198         cleanup_phase = 1; /* source dentry */
2199
2200         src_res_id.name[0] = id_fid(rec->ur_id1);
2201         src_res_id.name[1] = id_group(rec->ur_id1);
2202         policy.l_inodebits.bits = MDS_INODELOCK_UPDATE;
2203
2204         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
2205                               src_res_id, LDLM_IBITS, &policy,
2206                               LCK_EX, &flags, mds_blocking_ast,
2207                               ldlm_completion_ast, NULL, NULL,
2208                               NULL, 0, NULL, &src_lockh);
2209         if (rc != ELDLM_OK)
2210                 GOTO(cleanup, rc = -ENOLCK);
2211         cleanup_phase = 2; /* lock */
2212
2213         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_src->d_inode->i_sb);
2214
2215         handle = fsfilt_start(obd, de_src->d_inode, FSFILT_OP_LINK, NULL);
2216         if (IS_ERR(handle)) {
2217                 rc = PTR_ERR(handle);
2218                 GOTO(cleanup, rc);
2219         }
2220         de_src->d_inode->i_nlink++;
2221         mark_inode_dirty(de_src->d_inode);
2222
2223 cleanup:
2224         rc = mds_finish_transno(mds, de_src ? de_src->d_inode : NULL,
2225                                         handle, req, rc, 0);
2226         EXIT;
2227         switch (cleanup_phase) {
2228                 case 2:
2229                         if (rc)
2230                                 ldlm_lock_decref(&src_lockh, LCK_EX);
2231                         else
2232                                 ptlrpc_save_lock(req, &src_lockh, LCK_EX);
2233                 case 1:
2234                         l_dput(de_src);
2235                 case 0:
2236                         break;
2237                 default:
2238                         CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2239                         LBUG();
2240         }
2241         req->rq_status = rc;
2242         return 0;
2243 }
2244
2245 /*
2246  * request to link to foreign inode:
2247  *  - acquire i_nlinks on this inode
2248  *  - add dentry
2249  */
2250 static int mds_reint_link_to_remote(struct mds_update_record *rec,
2251                                     int offset, struct ptlrpc_request *req,
2252                                     struct lustre_handle *lh)
2253 {
2254         struct lustre_handle *handle = NULL, tgt_dir_lockh[2] = {{0}, {0}};
2255         struct obd_device *obd = req->rq_export->exp_obd;
2256         struct dentry *de_tgt_dir = NULL;
2257         struct mds_obd *mds = mds_req2mds(req);
2258         int rc = 0, cleanup_phase = 0;
2259         struct mdc_op_data *op_data;
2260         struct ptlrpc_request *request = NULL;
2261         int update_mode;
2262         ENTRY;
2263
2264         DEBUG_REQ(D_INODE, req, "%s: request to link "DLID4
2265                   ":%*s to foreign inode "DLID4"\n", obd->obd_name,
2266                   OLID4(rec->ur_id2), rec->ur_namelen - 1, rec->ur_name,
2267                   OLID4(rec->ur_id1));
2268
2269         de_tgt_dir = mds_id2locked_dentry(obd, rec->ur_id2, NULL, LCK_EX,
2270                                           tgt_dir_lockh, &update_mode,
2271                                           rec->ur_name, rec->ur_namelen - 1,
2272                                           MDS_INODELOCK_UPDATE);
2273         if (IS_ERR(de_tgt_dir))
2274                 GOTO(cleanup, rc = PTR_ERR(de_tgt_dir));
2275         cleanup_phase = 1;
2276
2277         OBD_ALLOC(op_data, sizeof(*op_data));
2278         if (op_data == NULL)
2279                 GOTO(cleanup, rc = -ENOMEM);
2280
2281         op_data->id1 = *(rec->ur_id1);
2282         op_data->namelen = 0;
2283         op_data->name = NULL;
2284         rc = md_link(mds->mds_md_exp, op_data, &request);
2285         OBD_FREE(op_data, sizeof(*op_data));
2286         if (rc)
2287                 GOTO(cleanup, rc);
2288
2289         cleanup_phase = 2;
2290         if (request)
2291                 ptlrpc_req_finished(request);
2292
2293         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_tgt_dir->d_inode->i_sb);
2294
2295         handle = fsfilt_start(obd, de_tgt_dir->d_inode, FSFILT_OP_LINK, NULL);
2296         if (IS_ERR(handle)) {
2297                 rc = PTR_ERR(handle);
2298                 GOTO(cleanup, rc);
2299         }
2300
2301         rc = fsfilt_add_dir_entry(obd, de_tgt_dir, rec->ur_name,
2302                                   rec->ur_namelen - 1, id_ino(rec->ur_id1),
2303                                   id_gen(rec->ur_id1), id_group(rec->ur_id1),
2304                                   id_fid(rec->ur_id1));
2305         cleanup_phase = 3;
2306
2307 cleanup:
2308         rc = mds_finish_transno(mds, de_tgt_dir ? de_tgt_dir->d_inode : NULL,
2309                                 handle, req, rc, 0);
2310         EXIT;
2311
2312         switch (cleanup_phase) {
2313                 case 3:
2314                         if (rc) {
2315                                 /* FIXME: drop i_nlink on remote inode here */
2316                                 CERROR("MUST drop drop i_nlink here\n");
2317                         }
2318                 case 2:
2319                 case 1:
2320                         if (rc) {
2321                                 ldlm_lock_decref(tgt_dir_lockh, LCK_EX);
2322 #ifdef S_PDIROPS
2323                                 ldlm_lock_decref(tgt_dir_lockh + 1, update_mode);
2324 #endif
2325                         } else {
2326                                 ptlrpc_save_lock(req, tgt_dir_lockh, LCK_EX);
2327 #ifdef S_PDIROPS
2328                                 ptlrpc_save_lock(req, tgt_dir_lockh + 1, update_mode);
2329 #endif
2330                         }
2331                         l_dput(de_tgt_dir);
2332                         break;
2333                 default:
2334                         CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2335                         LBUG();
2336         }
2337         req->rq_status = rc;
2338         return 0;
2339 }
2340
2341 static int mds_reint_link(struct mds_update_record *rec, int offset,
2342                           struct ptlrpc_request *req,
2343                           struct lustre_handle *lh)
2344 {
2345         struct obd_device *obd = req->rq_export->exp_obd;
2346         struct dentry *de_src = NULL;
2347         struct dentry *de_tgt_dir = NULL;
2348         struct dentry *dchild = NULL;
2349         struct mds_obd *mds = mds_req2mds(req);
2350         struct lustre_handle *handle = NULL;
2351         struct lustre_handle tgt_dir_lockh[2] = {{0}, {0}}, src_lockh = {0};
2352         struct ldlm_res_id src_res_id = { .name = {0} };
2353         struct ldlm_res_id tgt_dir_res_id = { .name = {0} };
2354         ldlm_policy_data_t src_policy ={.l_inodebits = {MDS_INODELOCK_UPDATE}};
2355         ldlm_policy_data_t tgt_dir_policy =
2356                                        {.l_inodebits = {MDS_INODELOCK_UPDATE}};
2357         int rc = 0, cleanup_phase = 0;
2358 #ifdef S_PDIROPS
2359         int update_mode = 0;
2360 #endif
2361         ENTRY;
2362
2363         LASSERT(offset == 1);
2364
2365         DEBUG_REQ(D_INODE, req, "original "LPU64"/%u to "LPU64"/%u %s",
2366                   id_ino(rec->ur_id1), id_gen(rec->ur_id1),
2367                   id_ino(rec->ur_id2), id_gen(rec->ur_id2),
2368                   rec->ur_name);
2369
2370         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
2371         MD_COUNTER_INCREMENT(obd, link);
2372
2373 //      memset(tgt_dir_lockh, 0, 2*sizeof(tgt_dir_lockh[0]));
2374         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_LINK))
2375                 GOTO(cleanup, rc = -ENOENT);
2376
2377         if (id_group(rec->ur_id1) != mds->mds_num) {
2378                 rc = mds_reint_link_to_remote(rec, offset, req, lh);
2379                 RETURN(rc);
2380         }
2381
2382         if (rec->ur_namelen == 1) {
2383                 rc = mds_reint_link_acquire(rec, offset, req, lh);
2384                 RETURN(rc);
2385         }
2386
2387         /* Step 1: Lookup the source inode and target directory by ID */
2388         de_src = mds_id2dentry(obd, rec->ur_id1, NULL);
2389         if (IS_ERR(de_src))
2390                 GOTO(cleanup, rc = PTR_ERR(de_src));
2391
2392         cleanup_phase = 1; /* source dentry */
2393
2394         de_tgt_dir = mds_id2dentry(obd, rec->ur_id2, NULL);
2395         if (IS_ERR(de_tgt_dir)) {
2396                 rc = PTR_ERR(de_tgt_dir);
2397                 de_tgt_dir = NULL;
2398                 GOTO(cleanup, rc);
2399         }
2400
2401         cleanup_phase = 2; /* target directory dentry */
2402
2403         CDEBUG(D_INODE, "linking %*s/%s to inode %lu\n",
2404                de_tgt_dir->d_name.len, de_tgt_dir->d_name.name,
2405                rec->ur_name, de_src->d_inode->i_ino);
2406
2407         /* Step 2: Take the two locks */
2408         src_res_id.name[0] = id_fid(rec->ur_id1);
2409         src_res_id.name[1] = id_group(rec->ur_id1);
2410         tgt_dir_res_id.name[0] = id_fid(rec->ur_id2);
2411         tgt_dir_res_id.name[1] = id_group(rec->ur_id2);
2412
2413 #ifdef S_PDIROPS
2414         if (IS_PDIROPS(de_tgt_dir->d_inode)) {
2415                 int flags = 0;
2416                 update_mode = mds_lock_mode_for_dir(obd, de_tgt_dir, LCK_EX);
2417                 if (update_mode) {
2418                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
2419                                               tgt_dir_res_id, LDLM_IBITS,
2420                                               &src_policy, update_mode, &flags,
2421                                               mds_blocking_ast,
2422                                               ldlm_completion_ast, NULL, NULL,
2423                                               NULL, 0, NULL, tgt_dir_lockh + 1);
2424                         if (rc != ELDLM_OK)
2425                                 GOTO(cleanup, rc = -ENOLCK);
2426                 }
2427
2428                 tgt_dir_res_id.name[2] = full_name_hash(rec->ur_name,
2429                                                         rec->ur_namelen - 1);
2430                 CDEBUG(D_INFO, "take lock on %lu:%lu:"LPX64"\n",
2431                        (unsigned long)id_fid(rec->ur_id2),
2432                        (unsigned long)id_group(rec->ur_id2),
2433                        tgt_dir_res_id.name[2]);
2434         }
2435 #endif
2436         rc = enqueue_ordered_locks(obd, &src_res_id, &src_lockh, LCK_EX,
2437                                    &src_policy, &tgt_dir_res_id, tgt_dir_lockh,
2438                                    LCK_EX, &tgt_dir_policy);
2439         if (rc)
2440                 GOTO(cleanup, rc);
2441
2442         cleanup_phase = 3; /* locks */
2443
2444         /* Step 3: Lookup the child */
2445         dchild = ll_lookup_one_len(rec->ur_name, de_tgt_dir,
2446                                    rec->ur_namelen - 1);
2447         if (IS_ERR(dchild)) {
2448                 rc = PTR_ERR(dchild);
2449                 if (rc != -EPERM && rc != -EACCES)
2450                         CERROR("child lookup error %d\n", rc);
2451                 GOTO(cleanup, rc);
2452         }
2453
2454         cleanup_phase = 4; /* child dentry */
2455
2456         if (dchild->d_inode) {
2457                 CDEBUG(D_INODE, "child exists (dir %lu, name %s)\n",
2458                        de_tgt_dir->d_inode->i_ino, rec->ur_name);
2459                 rc = -EEXIST;
2460                 GOTO(cleanup, rc);
2461         }
2462
2463         /* Step 4: Do it. */
2464         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_src->d_inode->i_sb);
2465
2466         handle = fsfilt_start(obd, de_tgt_dir->d_inode, FSFILT_OP_LINK, NULL);
2467         if (IS_ERR(handle)) {
2468                 rc = PTR_ERR(handle);
2469                 GOTO(cleanup, rc);
2470         }
2471
2472         rc = vfs_link(de_src, de_tgt_dir->d_inode, dchild);
2473         if (rc && rc != -EPERM && rc != -EACCES)
2474                 CERROR("vfs_link error %d\n", rc);
2475 cleanup:
2476         rc = mds_finish_transno(mds, de_tgt_dir ? de_tgt_dir->d_inode : NULL,
2477                                 handle, req, rc, 0);
2478         EXIT;
2479
2480         switch (cleanup_phase) {
2481         case 4: /* child dentry */
2482                 l_dput(dchild);
2483         case 3: /* locks */
2484                 if (rc) {
2485                         ldlm_lock_decref(&src_lockh, LCK_EX);
2486                         ldlm_lock_decref(tgt_dir_lockh, LCK_EX);
2487                 } else {
2488                         ptlrpc_save_lock(req, &src_lockh, LCK_EX);
2489                         ptlrpc_save_lock(req, tgt_dir_lockh, LCK_EX);
2490                 }
2491         case 2: /* target dentry */
2492 #ifdef S_PDIROPS
2493                 if (tgt_dir_lockh[1].cookie && update_mode)
2494                         ldlm_lock_decref(tgt_dir_lockh + 1, update_mode);
2495 #endif
2496                 if (de_tgt_dir)
2497                         l_dput(de_tgt_dir);
2498         case 1: /* source dentry */
2499                 l_dput(de_src);
2500         case 0:
2501                 break;
2502         default:
2503                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2504                 LBUG();
2505         }
2506         req->rq_status = rc;
2507         return 0;
2508 }
2509
2510 /* The idea here is that we need to get four locks in the end:
2511  * one on each parent directory, one on each child.  We need to take
2512  * these locks in some kind of order (to avoid deadlocks), and the order
2513  * I selected is "increasing resource number" order.  We need to look up
2514  * the children, however, before we know what the resource number(s) are.
2515  * Thus the following plan:
2516  *
2517  * 1,2. Look up the parents
2518  * 3,4. Look up the children
2519  * 5. Take locks on the parents and children, in order
2520  * 6. Verify that the children haven't changed since they were looked up
2521  *
2522  * If there was a race and the children changed since they were first looked
2523  * up, it is possible that mds_verify_child() will be able to just grab the
2524  * lock on the new child resource (if it has a higher resource than any other)
2525  * but we need to compare against not only its parent, but also against the
2526  * parent and child of the "other half" of the rename, hence maxres_{src,tgt}.
2527  *
2528  * We need the fancy igrab() on the child inodes because we aren't holding a
2529  * lock on the parent after the lookup is done, so dentry->d_inode may change
2530  * at any time, and igrab() itself doesn't like getting passed a NULL argument.
2531  */
2532 static int mds_get_parents_children_locked(struct obd_device *obd,
2533                                            struct mds_obd *mds,
2534                                            struct lustre_id *p1_id,
2535                                            struct dentry **de_srcdirp,
2536                                            struct lustre_id *p2_id,
2537                                            struct dentry **de_tgtdirp,
2538                                            int parent_mode,
2539                                            const char *old_name, int old_len,
2540                                            struct dentry **de_oldp,
2541                                            const char *new_name, int new_len,
2542                                            struct dentry **de_newp,
2543                                            struct lustre_handle *dlm_handles,
2544                                            int child_mode)
2545 {
2546         struct ldlm_res_id p1_res_id = { .name = {0} };
2547         struct ldlm_res_id p2_res_id = { .name = {0} };
2548         struct ldlm_res_id c1_res_id = { .name = {0} };
2549         struct ldlm_res_id c2_res_id = { .name = {0} };
2550         ldlm_policy_data_t p_policy = {.l_inodebits = {MDS_INODELOCK_UPDATE}};
2551         /* Only dentry should change, but the inode itself would be
2552            intact otherwise */
2553         ldlm_policy_data_t c1_policy = {.l_inodebits = {MDS_INODELOCK_LOOKUP}};
2554         /* If something is going to be replaced, both dentry and inode locks are
2555            needed */
2556         ldlm_policy_data_t c2_policy = {.l_inodebits = {MDS_INODELOCK_LOOKUP|
2557                                                         MDS_INODELOCK_UPDATE}};
2558         struct ldlm_res_id *maxres_src, *maxres_tgt;
2559         struct inode *inode;
2560         __u32 child1_gen = 0;
2561         __u32 child2_gen = 0;
2562         unsigned long child1_ino;
2563         unsigned long child2_ino;
2564         int rc = 0, cleanup_phase = 0;
2565         ENTRY;
2566
2567         /* Step 1: Lookup the source directory */
2568         *de_srcdirp = mds_id2dentry(obd, p1_id, NULL);
2569         if (IS_ERR(*de_srcdirp))
2570                 GOTO(cleanup, rc = PTR_ERR(*de_srcdirp));
2571
2572         cleanup_phase = 1; /* source directory dentry */
2573
2574         p1_res_id.name[0] = id_fid(p1_id);
2575         p1_res_id.name[1] = id_group(p1_id);
2576
2577         /* Step 2: Lookup the target directory */
2578         if (id_equal_stc(p1_id, p2_id)) {
2579                 *de_tgtdirp = dget(*de_srcdirp);
2580         } else {
2581                 *de_tgtdirp = mds_id2dentry(obd, p2_id, NULL);
2582                 if (IS_ERR(*de_tgtdirp)) {
2583                         rc = PTR_ERR(*de_tgtdirp);
2584                         *de_tgtdirp = NULL;
2585                         GOTO(cleanup, rc);
2586                 }
2587         }
2588
2589         cleanup_phase = 2; /* target directory dentry */
2590
2591         p2_res_id.name[0] = id_fid(p2_id);
2592         p2_res_id.name[1] = id_group(p2_id);
2593
2594 #ifdef S_PDIROPS
2595         dlm_handles[5].cookie = 0;
2596         dlm_handles[6].cookie = 0;
2597
2598         if (IS_PDIROPS((*de_srcdirp)->d_inode)) {
2599                 /*
2600                  * get a temp lock on just fid, group to flush client cache and
2601                  * to protect dirs from concurrent splitting.
2602                  */
2603                 rc = enqueue_ordered_locks(obd, &p1_res_id, &dlm_handles[5],
2604                                            LCK_PW, &p_policy, &p2_res_id,
2605                                            &dlm_handles[6], LCK_PW, &p_policy);
2606                 if (rc != ELDLM_OK)
2607                         GOTO(cleanup, rc);
2608
2609                 p1_res_id.name[2] = full_name_hash(old_name, old_len - 1);
2610                 p2_res_id.name[2] = full_name_hash(new_name, new_len - 1);
2611
2612                 CDEBUG(D_INFO, "take locks on "
2613                        LPX64":"LPX64":"LPX64", "LPX64":"LPX64":"LPX64"\n",
2614                        p1_res_id.name[0], p1_res_id.name[1], p1_res_id.name[2],
2615                        p2_res_id.name[0], p2_res_id.name[1], p2_res_id.name[2]);
2616         }
2617         cleanup_phase = 3;
2618 #endif
2619
2620         /* Step 3: Lookup the source child entry */
2621         *de_oldp = ll_lookup_one_len(old_name, *de_srcdirp,
2622                                      old_len - 1);
2623         if (IS_ERR(*de_oldp)) {
2624                 rc = PTR_ERR(*de_oldp);
2625                 CERROR("old child lookup error (%*s): %d\n",
2626                        old_len - 1, old_name, rc);
2627                 GOTO(cleanup, rc);
2628         }
2629
2630         cleanup_phase = 4; /* original name dentry */
2631
2632         inode = (*de_oldp)->d_inode;
2633         if (inode != NULL) {
2634                 struct lustre_id sid;
2635
2636                 inode = igrab(inode);
2637                 if (inode == NULL)
2638                         GOTO(cleanup, rc = -ENOENT);
2639
2640                 down(&inode->i_sem);
2641                 rc = mds_read_inode_sid(obd, inode, &sid);
2642                 up(&inode->i_sem);
2643                 if (rc) {
2644                         CERROR("Can't read inode self id, inode %lu, "
2645                                "rc %d\n", inode->i_ino, rc);
2646                         iput(inode);
2647                         GOTO(cleanup, rc);
2648                 }
2649
2650                 c1_res_id.name[0] = id_fid(&sid);
2651                 c1_res_id.name[1] = id_group(&sid);
2652                 child1_gen = inode->i_generation;
2653                 child1_ino = inode->i_ino;
2654                 iput(inode);
2655         } else if ((*de_oldp)->d_flags & DCACHE_CROSS_REF) {
2656                 c1_res_id.name[0] = (*de_oldp)->d_fid;
2657                 c1_res_id.name[1] = (*de_oldp)->d_mdsnum;
2658                 child1_gen = (*de_oldp)->d_generation;
2659                 child1_ino = (*de_oldp)->d_inum;
2660         } else {
2661                 GOTO(cleanup, rc = -ENOENT);
2662         }
2663
2664         /* Step 4: Lookup the target child entry */
2665         *de_newp = ll_lookup_one_len(new_name, *de_tgtdirp,
2666                                      new_len - 1);
2667         if (IS_ERR(*de_newp)) {
2668                 rc = PTR_ERR(*de_newp);
2669                 CERROR("new child lookup error (%*s): %d\n",
2670                        old_len - 1, old_name, rc);
2671                 GOTO(cleanup, rc);
2672         }
2673
2674         cleanup_phase = 5; /* target dentry */
2675
2676         inode = (*de_newp)->d_inode;
2677         if (inode != NULL) {
2678                 struct lustre_id sid;
2679
2680                 inode = igrab(inode);
2681                 if (inode == NULL)
2682                         goto retry_locks;
2683
2684                 down(&inode->i_sem);
2685                 rc = mds_read_inode_sid(obd, inode, &sid);
2686                 up(&inode->i_sem);
2687                 if (rc) {
2688                         CERROR("Can't read inode self id, inode %lu, "
2689                                "rc %d\n", inode->i_ino, rc);
2690                         GOTO(cleanup, rc);
2691                 }
2692
2693                 c2_res_id.name[0] = id_fid(&sid);
2694                 c2_res_id.name[1] = id_group(&sid);
2695                 child2_gen = inode->i_generation;
2696                 child2_ino = inode->i_ino;
2697                 iput(inode);
2698         } else if ((*de_newp)->d_flags & DCACHE_CROSS_REF) {
2699                 c2_res_id.name[0] = (*de_newp)->d_fid;
2700                 c2_res_id.name[1] = (*de_newp)->d_mdsnum;
2701                 child2_gen = (*de_newp)->d_generation;
2702                 child2_ino = (*de_newp)->d_inum;
2703         }
2704
2705 retry_locks:
2706         /* Step 5: Take locks on the parents and child(ren) */
2707         maxres_src = &p1_res_id;
2708         maxres_tgt = &p2_res_id;
2709         cleanup_phase = 5; /* target dentry */
2710
2711         if (c1_res_id.name[0] != 0 && res_gt(&c1_res_id, &p1_res_id, NULL, NULL))
2712                 maxres_src = &c1_res_id;
2713         if (c2_res_id.name[0] != 0 && res_gt(&c2_res_id, &p2_res_id, NULL, NULL))
2714                 maxres_tgt = &c2_res_id;
2715
2716         rc = enqueue_4ordered_locks(obd, &p1_res_id, &dlm_handles[0], parent_mode,
2717                                     &p_policy,
2718                                     &p2_res_id, &dlm_handles[1], parent_mode,
2719                                     &p_policy,
2720                                     &c1_res_id, &dlm_handles[2], child_mode,
2721                                     &c1_policy,
2722                                     &c2_res_id, &dlm_handles[3], child_mode,
2723                                     &c2_policy);
2724         if (rc)
2725                 GOTO(cleanup, rc);
2726
2727         cleanup_phase = 6; /* parent and child(ren) locks */
2728
2729         /* Step 6a: Re-lookup source child to verify it hasn't changed */
2730         rc = mds_verify_child(obd, &p1_res_id, &dlm_handles[0], *de_srcdirp,
2731                               parent_mode, &c1_res_id, &dlm_handles[2],
2732                               de_oldp, child_mode, &c1_policy, old_name,old_len,
2733                               maxres_tgt, child1_ino, child1_gen);
2734         if (rc) {
2735                 if (c2_res_id.name[0] != 0)
2736                         ldlm_lock_decref(&dlm_handles[3], child_mode);
2737                 ldlm_lock_decref(&dlm_handles[1], parent_mode);
2738                 cleanup_phase = 5;
2739                 if (rc > 0)
2740                         goto retry_locks;
2741                 GOTO(cleanup, rc);
2742         }
2743
2744         if (!DENTRY_VALID(*de_oldp))
2745                 GOTO(cleanup, rc = -ENOENT);
2746
2747         /* Step 6b: Re-lookup target child to verify it hasn't changed */
2748         rc = mds_verify_child(obd, &p2_res_id, &dlm_handles[1], *de_tgtdirp,
2749                               parent_mode, &c2_res_id, &dlm_handles[3],
2750                               de_newp, child_mode, &c2_policy, new_name,
2751                               new_len, maxres_src, child2_ino, child2_gen);
2752         if (rc) {
2753                 ldlm_lock_decref(&dlm_handles[2], child_mode);
2754                 ldlm_lock_decref(&dlm_handles[0], parent_mode);
2755                 cleanup_phase = 5;
2756                 if (rc > 0)
2757                         goto retry_locks;
2758                 GOTO(cleanup, rc);
2759         }
2760
2761         EXIT;
2762 cleanup:
2763         if (rc) {
2764                 switch (cleanup_phase) {
2765                 case 6: /* child lock(s) */
2766                         if (c2_res_id.name[0] != 0)
2767                                 ldlm_lock_decref(&dlm_handles[3], child_mode);
2768                         if (c1_res_id.name[0] != 0)
2769                                 ldlm_lock_decref(&dlm_handles[2], child_mode);
2770                         if (dlm_handles[1].cookie != 0)
2771                                 ldlm_lock_decref(&dlm_handles[1], parent_mode);
2772                         if (dlm_handles[0].cookie != 0)
2773                                 ldlm_lock_decref(&dlm_handles[0], parent_mode);
2774                 case 5: /* target dentry */
2775                         l_dput(*de_newp);
2776                 case 4: /* source dentry */
2777                         l_dput(*de_oldp);
2778                 case 3:
2779 #ifdef S_PDIROPS
2780                         if (dlm_handles[5].cookie != 0)
2781                                 ldlm_lock_decref(&(dlm_handles[5]), LCK_PW);
2782                         if (dlm_handles[6].cookie != 0)
2783                                 ldlm_lock_decref(&(dlm_handles[6]), LCK_PW);
2784 #endif
2785                 case 2: /* target directory dentry */
2786                         l_dput(*de_tgtdirp);
2787                 case 1: /* source directry dentry */
2788                         l_dput(*de_srcdirp);
2789                 }
2790         }
2791
2792         return rc;
2793 }
2794
2795 /*
2796  * checks if dentry can be removed. This function also handles cross-ref
2797  * dentries.
2798  */
2799 static int mds_check_for_rename(struct obd_device *obd,
2800                                 struct dentry *dentry)
2801 {
2802         struct mds_obd *mds = &obd->u.mds;
2803         struct lustre_handle *rlockh;
2804         struct ptlrpc_request *req;
2805         struct mdc_op_data *op_data;
2806         struct lookup_intent it;
2807         int handle_size, rc = 0;
2808         ENTRY;
2809
2810         LASSERT(dentry != NULL);
2811
2812         if (dentry->d_inode) {
2813                 if (S_ISDIR(dentry->d_inode->i_mode) &&
2814                     !mds_is_dir_empty(obd, dentry))
2815                         rc = -ENOTEMPTY;
2816         } else {
2817                 LASSERT((dentry->d_flags & DCACHE_CROSS_REF));
2818                 handle_size = sizeof(struct lustre_handle);
2819
2820                 OBD_ALLOC(rlockh, handle_size);
2821                 if (rlockh == NULL)
2822                         RETURN(-ENOMEM);
2823
2824                 memset(rlockh, 0, handle_size);
2825                 OBD_ALLOC(op_data, sizeof(*op_data));
2826                 if (op_data == NULL) {
2827                         OBD_FREE(rlockh, handle_size);
2828                         RETURN(-ENOMEM);
2829                 }
2830                 memset(op_data, 0, sizeof(*op_data));
2831                 mds_pack_dentry2id(obd, &op_data->id1, dentry, 1);
2832
2833                 it.it_op = IT_UNLINK;
2834                 rc = md_enqueue(mds->mds_md_exp, LDLM_IBITS, &it, LCK_EX,
2835                                 op_data, rlockh, NULL, 0, ldlm_completion_ast,
2836                                 mds_blocking_ast, NULL);
2837                 OBD_FREE(op_data, sizeof(*op_data));
2838
2839                 if (rc)
2840                         RETURN(rc);
2841
2842                 if (rlockh->cookie != 0)
2843                         ldlm_lock_decref(rlockh, LCK_EX);
2844
2845                 if (it.d.lustre.it_data) {
2846                         req = (struct ptlrpc_request *)it.d.lustre.it_data;
2847                         ptlrpc_req_finished(req);
2848                 }
2849
2850                 if (it.d.lustre.it_status)
2851                         rc = it.d.lustre.it_status;
2852                 OBD_FREE(rlockh, handle_size);
2853         }
2854         RETURN(rc);
2855 }
2856
2857 static int mds_add_local_dentry(struct mds_update_record *rec, int offset,
2858                                 struct ptlrpc_request *req, struct lustre_id *id,
2859                                 struct dentry *de_dir, struct dentry *de,
2860                                 int del_cross_ref)
2861 {
2862         struct obd_device *obd = req->rq_export->exp_obd;
2863         struct mds_obd *mds = mds_req2mds(req);
2864         void *handle = NULL;
2865         int rc = 0;
2866         ENTRY;
2867
2868         if (de->d_inode) {
2869                 /*
2870                  * name exists and points to local inode try to unlink this name
2871                  * and create new one.
2872                  */
2873                 CDEBUG(D_OTHER, "%s: %s points to local inode %lu/%lu\n",
2874                        obd->obd_name, rec->ur_tgt, (unsigned long)de->d_inode->i_ino,
2875                        (unsigned long)de->d_inode->i_generation);
2876
2877                 /* checking if we can remove local dentry. */
2878                 rc = mds_check_for_rename(obd, de);
2879                 if (rc)
2880                         GOTO(cleanup, rc);
2881
2882                 handle = fsfilt_start(obd, de_dir->d_inode,
2883                                       FSFILT_OP_RENAME, NULL);
2884                 if (IS_ERR(handle))
2885                         GOTO(cleanup, rc = PTR_ERR(handle));
2886                 rc = fsfilt_del_dir_entry(req->rq_export->exp_obd, de);
2887                 if (rc)
2888                         GOTO(cleanup, rc);
2889         } else if (de->d_flags & DCACHE_CROSS_REF) {
2890                 CDEBUG(D_OTHER, "%s: %s points to remote inode %lu/%lu\n",
2891                        obd->obd_name, rec->ur_tgt, (unsigned long)de->d_mdsnum,
2892                         (unsigned long)de->d_fid);
2893
2894                 /* checking if we can remove local dentry. */
2895                 rc = mds_check_for_rename(obd, de);
2896                 if (rc)
2897                         GOTO(cleanup, rc);
2898
2899                 /*
2900                  * to be fully POSIX compatible, we should add one more check:
2901                  *
2902                  * if de_new is subdir of dir rec->ur_id1. If so - return
2903                  * -EINVAL.
2904                  *
2905                  * I do not know how to implement it right now, because
2906                  * inodes/dentries for new and old names lie on different MDS,
2907                  * so add this notice here just to make it visible for the rest
2908                  * of developers and do not forget about. And when this check
2909                  * will be added, del_cross_ref should gone, that is local
2910                  * dentry is able to be removed if all checks passed.
2911                  *
2912                  * Currently -EEXISTS is returned by fsfilt_add_dir_entry() what
2913                  * is not fully correct. --umka
2914                  */
2915
2916                 if (del_cross_ref) {
2917                         handle = fsfilt_start(obd, de_dir->d_inode,
2918                                               FSFILT_OP_RENAME, NULL);
2919                         if (IS_ERR(handle))
2920                                 GOTO(cleanup, rc = PTR_ERR(handle));
2921                         rc = fsfilt_del_dir_entry(req->rq_export->exp_obd, de);
2922                         if (rc)
2923                                 GOTO(cleanup, rc);
2924                 }
2925
2926         } else {
2927                 /* name doesn't exist. the simplest case. */
2928                 handle = fsfilt_start(obd, de_dir->d_inode,
2929                                       FSFILT_OP_LINK, NULL);
2930                 if (IS_ERR(handle))
2931                         GOTO(cleanup, rc = PTR_ERR(handle));
2932         }
2933
2934         rc = fsfilt_add_dir_entry(obd, de_dir, rec->ur_tgt,
2935                                   rec->ur_tgtlen - 1, id_ino(id),
2936                                   id_gen(id), id_group(id), id_fid(id));
2937         if (rc) {
2938                 CERROR("add_dir_entry() returned error %d\n", rc);
2939                 GOTO(cleanup, rc);
2940         }
2941
2942 cleanup:
2943         EXIT;
2944         rc = mds_finish_transno(mds, de_dir ? de_dir->d_inode : NULL,
2945                                 handle, req, rc, 0);
2946
2947         RETURN(rc);
2948 }
2949
2950 static int mds_del_local_dentry(struct mds_update_record *rec, int offset,
2951                                 struct ptlrpc_request *req, struct dentry *de_dir,
2952                                 struct dentry *de)
2953 {
2954         struct obd_device *obd = req->rq_export->exp_obd;
2955         struct mds_obd *mds = mds_req2mds(req);
2956         void *handle = NULL;
2957         int rc = 0;
2958         ENTRY;
2959
2960         handle = fsfilt_start(obd, de_dir->d_inode, FSFILT_OP_UNLINK, NULL);
2961         if (IS_ERR(handle))
2962                 GOTO(cleanup, rc = PTR_ERR(handle));
2963         rc = fsfilt_del_dir_entry(obd, de);
2964         d_drop(de);
2965
2966 cleanup:
2967         EXIT;
2968         rc = mds_finish_transno(mds, de_dir ? de_dir->d_inode : NULL,
2969                                 handle, req, rc, 0);
2970         RETURN(0);
2971 }
2972
2973 static int mds_reint_rename_create_name(struct mds_update_record *rec,
2974                                         int offset, struct ptlrpc_request *req)
2975 {
2976         struct lustre_handle parent_lockh[2] = {{0}, {0}};
2977         struct obd_device *obd = req->rq_export->exp_obd;
2978         struct mds_obd *mds = mds_req2mds(req);
2979         struct lustre_handle child_lockh = {0};
2980         struct dentry *de_tgtdir = NULL;
2981         struct dentry *de_new = NULL;
2982         int cleanup_phase = 0;
2983         int update_mode, rc = 0;
2984         ENTRY;
2985
2986         /*
2987          * another MDS executing rename operation has asked us to create target
2988          * name. such a creation should destroy existing target name.
2989          */
2990         CDEBUG(D_OTHER, "%s: request to create name %s for "DLID4"\n",
2991                obd->obd_name, rec->ur_tgt, OLID4(rec->ur_id1));
2992
2993         /* first, lookup the target */
2994         rc = mds_get_parent_child_locked(obd, mds, rec->ur_id2, parent_lockh,
2995                                          &de_tgtdir, LCK_PW, MDS_INODELOCK_UPDATE,
2996                                          &update_mode, rec->ur_tgt, rec->ur_tgtlen,
2997                                          &child_lockh, &de_new, LCK_EX,
2998                                          MDS_INODELOCK_LOOKUP);
2999         if (rc)
3000                 GOTO(cleanup, rc);
3001
3002         cleanup_phase = 1;
3003
3004         LASSERT(de_tgtdir);
3005         LASSERT(de_tgtdir->d_inode);
3006         LASSERT(de_new);
3007
3008         rc = mds_add_local_dentry(rec, offset, req, rec->ur_id1,
3009                                   de_tgtdir, de_new, 0);
3010
3011         EXIT;
3012 cleanup:
3013
3014         if (cleanup_phase == 1) {
3015 #ifdef S_PDIROPS
3016                 if (parent_lockh[1].cookie != 0)
3017                         ldlm_lock_decref(parent_lockh + 1, update_mode);
3018 #endif
3019                 ldlm_lock_decref(parent_lockh, LCK_PW);
3020                 if (child_lockh.cookie != 0)
3021                         ldlm_lock_decref(&child_lockh, LCK_EX);
3022                 l_dput(de_new);
3023                 l_dput(de_tgtdir);
3024         }
3025
3026         req->rq_status = rc;
3027         return 0;
3028 }
3029
3030 static int mds_reint_rename_to_remote(struct mds_update_record *rec, int offset,
3031                                       struct ptlrpc_request *req)
3032 {
3033         struct obd_device *obd = req->rq_export->exp_obd;
3034         struct ptlrpc_request *req2 = NULL;
3035         struct dentry *de_srcdir = NULL;
3036         struct dentry *de_old = NULL;
3037         struct mds_obd *mds = mds_req2mds(req);
3038         struct lustre_handle parent_lockh[2] = {{0}, {0}};
3039         struct lustre_handle child_lockh = {0};
3040         struct mdc_op_data *op_data;
3041         int update_mode, rc = 0;
3042         ENTRY;
3043
3044         CDEBUG(D_OTHER, "%s: move name %s onto another mds #%lu\n",
3045                obd->obd_name, rec->ur_name, (unsigned long)id_group(rec->ur_id2));
3046
3047         OBD_ALLOC(op_data, sizeof(*op_data));
3048         if (op_data == NULL)
3049                 RETURN(-ENOMEM);
3050         memset(op_data, 0, sizeof(*op_data));
3051
3052         rc = mds_get_parent_child_locked(obd, mds, rec->ur_id1, parent_lockh,
3053                                          &de_srcdir, LCK_PW, MDS_INODELOCK_UPDATE,
3054                                          &update_mode, rec->ur_name,
3055                                          rec->ur_namelen, &child_lockh, &de_old,
3056                                          LCK_EX, MDS_INODELOCK_LOOKUP);
3057         LASSERT(rc == 0);
3058         LASSERT(de_srcdir);
3059         LASSERT(de_srcdir->d_inode);
3060         LASSERT(de_old);
3061
3062         /*
3063          * we already know the target should be created on another MDS so, we
3064          * have to request that MDS to do it.
3065          */
3066
3067         /* prepare source id */
3068         if (de_old->d_flags & DCACHE_CROSS_REF) {
3069                 LASSERT(de_old->d_inode == NULL);
3070                 CDEBUG(D_OTHER, "request to move remote name\n");
3071                 mds_pack_dentry2id(obd, &op_data->id1, de_old, 1);
3072         } else if (de_old->d_inode == NULL) {
3073                 /* oh, source doesn't exist */
3074                 OBD_FREE(op_data, sizeof(*op_data));
3075                 GOTO(cleanup, rc = -ENOENT);
3076         } else {
3077                 struct lustre_id sid;
3078                 struct inode *inode = de_old->d_inode;
3079
3080                 LASSERT(inode != NULL);
3081                 CDEBUG(D_OTHER, "request to move local name\n");
3082                 id_ino(&op_data->id1) = inode->i_ino;
3083                 id_group(&op_data->id1) = mds->mds_num;
3084                 id_gen(&op_data->id1) = inode->i_generation;
3085
3086                 down(&inode->i_sem);
3087                 rc = mds_read_inode_sid(obd, inode, &sid);
3088                 up(&inode->i_sem);
3089                 if (rc) {
3090                         CERROR("Can't read inode self id, "
3091                                "inode %lu, rc = %d\n",
3092                                inode->i_ino, rc);
3093                         GOTO(cleanup, rc);
3094                 }
3095
3096                 id_fid(&op_data->id1) = id_fid(&sid);
3097         }
3098
3099         op_data->id2 = *rec->ur_id2;
3100         rc = md_rename(mds->mds_md_exp, op_data, NULL, 0,
3101                        rec->ur_tgt, rec->ur_tgtlen - 1, &req2);
3102         OBD_FREE(op_data, sizeof(*op_data));
3103
3104         if (rc)
3105                 GOTO(cleanup, rc);
3106
3107         rc = mds_del_local_dentry(rec, offset, req, de_srcdir,
3108                                   de_old);
3109
3110         EXIT;
3111 cleanup:
3112         if (req2)
3113                 ptlrpc_req_finished(req2);
3114
3115 #ifdef S_PDIROPS
3116         if (parent_lockh[1].cookie != 0)
3117                 ldlm_lock_decref(parent_lockh + 1, update_mode);
3118 #endif
3119         ldlm_lock_decref(parent_lockh, LCK_PW);
3120         if (child_lockh.cookie != 0)
3121                 ldlm_lock_decref(&child_lockh, LCK_EX);
3122
3123         l_dput(de_old);
3124         l_dput(de_srcdir);
3125
3126         req->rq_status = rc;
3127         return 0;
3128 }
3129
3130 static int mds_reint_rename(struct mds_update_record *rec, int offset,
3131                             struct ptlrpc_request *req, struct lustre_handle *lockh)
3132 {
3133         struct obd_device *obd = req->rq_export->exp_obd;
3134         struct dentry *de_srcdir = NULL;
3135         struct dentry *de_tgtdir = NULL;
3136         struct dentry *de_old = NULL;
3137         struct dentry *de_new = NULL;
3138         struct inode *old_inode = NULL, *new_inode = NULL;
3139         struct mds_obd *mds = mds_req2mds(req);
3140         struct lustre_handle dlm_handles[7] = {{0},{0},{0},{0},{0},{0},{0}};
3141         struct mds_body *body = NULL;
3142         struct llog_create_locks *lcl = NULL;
3143         struct lov_mds_md *lmm = NULL;
3144         int rc = 0, cleanup_phase = 0;
3145         void *handle = NULL;
3146         ENTRY;
3147
3148         LASSERT(offset == 1);
3149
3150         DEBUG_REQ(D_INODE, req, "parent "DLID4" %s to "DLID4" %s",
3151                   OLID4(rec->ur_id1), rec->ur_name, OLID4(rec->ur_id2),
3152                   rec->ur_tgt);
3153
3154         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
3155
3156         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
3157                 DEBUG_REQ(D_HA, req, "rename replay\n");
3158                 memcpy(lustre_msg_buf(req->rq_repmsg, 2, 0),
3159                        lustre_msg_buf(req->rq_reqmsg, offset + 3, 0),
3160                        req->rq_repmsg->buflens[2]);
3161         }
3162
3163         MD_COUNTER_INCREMENT(obd, rename);
3164
3165         if (rec->ur_namelen == 1) {
3166                 rc = mds_reint_rename_create_name(rec, offset, req);
3167                 RETURN(rc);
3168         }
3169
3170         /* check if new name should be located on remote target. */
3171         if (id_group(rec->ur_id2) != mds->mds_num) {
3172                 rc = mds_reint_rename_to_remote(rec, offset, req);
3173                 RETURN(rc);
3174         }
3175
3176         rc = mds_get_parents_children_locked(obd, mds, rec->ur_id1, &de_srcdir,
3177                                              rec->ur_id2, &de_tgtdir, LCK_PW,
3178                                              rec->ur_name, rec->ur_namelen,
3179                                              &de_old, rec->ur_tgt,
3180                                              rec->ur_tgtlen, &de_new,
3181                                              dlm_handles, LCK_EX);
3182         if (rc)
3183                 GOTO(cleanup, rc);
3184
3185         cleanup_phase = 1; /* parent(s), children, locks */
3186         old_inode = de_old->d_inode;
3187         new_inode = de_new->d_inode;
3188
3189         /* sanity check for src inode */
3190         if (de_old->d_flags & DCACHE_CROSS_REF) {
3191                 LASSERT(de_old->d_inode == NULL);
3192
3193                 /*
3194                  * in the case of cross-ref dir, we can perform this check only
3195                  * if child and parent lie on the same mds. This is because
3196                  * otherwise they can have the same inode numbers.
3197                  */
3198                 if (de_old->d_mdsnum == mds->mds_num) {
3199                         if (de_old->d_inum == de_srcdir->d_inode->i_ino ||
3200                             de_old->d_inum == de_tgtdir->d_inode->i_ino)
3201                                 GOTO(cleanup, rc = -EINVAL);
3202                 }
3203         } else {
3204                 LASSERT(de_old->d_inode != NULL);
3205                 if (de_old->d_inode->i_ino == de_srcdir->d_inode->i_ino ||
3206                     de_old->d_inode->i_ino == de_tgtdir->d_inode->i_ino)
3207                         GOTO(cleanup, rc = -EINVAL);
3208         }
3209
3210         /* sanity check for dest inode */
3211         if (de_new->d_flags & DCACHE_CROSS_REF) {
3212                 LASSERT(new_inode == NULL);
3213
3214                 /* the same check about target dentry. */
3215                 if (de_new->d_mdsnum == mds->mds_num) {
3216                         if (de_new->d_inum == de_srcdir->d_inode->i_ino ||
3217                             de_new->d_inum == de_tgtdir->d_inode->i_ino)
3218                                 GOTO(cleanup, rc = -EINVAL);
3219                 }
3220
3221                 /*
3222                  * regular files usualy do not have ->rename() implemented. But
3223                  * we handle only this case when @de_new is cross-ref entry,
3224                  * because in other cases it will be handled by vfs_rename().
3225                  */
3226                 if (de_old->d_inode && (!de_old->d_inode->i_op ||
3227                     !de_old->d_inode->i_op->rename))
3228                         GOTO(cleanup, rc = -EPERM);
3229         } else {
3230                 if (new_inode &&
3231                     (new_inode->i_ino == de_srcdir->d_inode->i_ino ||
3232                      new_inode->i_ino == de_tgtdir->d_inode->i_ino))
3233                         GOTO(cleanup, rc = -EINVAL);
3234
3235         }
3236
3237 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
3238         /*
3239          * check if we are moving old entry into its child. 2.6 does not check
3240          * for this in vfs_rename() anymore.
3241          */
3242         if (is_subdir(de_new, de_old))
3243                 GOTO(cleanup, rc = -EINVAL);
3244 #endif
3245
3246         /* check if inodes point to each other. */
3247         if (!(de_old->d_flags & DCACHE_CROSS_REF) &&
3248             !(de_new->d_flags & DCACHE_CROSS_REF) &&
3249             old_inode == new_inode)
3250                 GOTO(cleanup, rc = 0);
3251
3252         /*
3253          * if we are about to remove the target at first, pass the EA of that
3254          * inode to client to perform and cleanup on OST.
3255          */
3256         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
3257         LASSERT(body != NULL);
3258
3259         /* child i_alloc_sem protects orphan_dec_test && is_orphan race */
3260         if (new_inode)
3261                 DOWN_READ_I_ALLOC_SEM(new_inode);
3262
3263         cleanup_phase = 2; /* up(&new_inode->i_sem) when finished */
3264
3265         if (new_inode && ((S_ISDIR(new_inode->i_mode) &&
3266             new_inode->i_nlink == 2) ||
3267             new_inode->i_nlink == 1)) {
3268                 if (mds_orphan_open_count(new_inode) > 0) {
3269                         /* need to lock pending_dir before transaction */
3270                         down(&mds->mds_pending_dir->d_inode->i_sem);
3271                         cleanup_phase = 3; /* up(&pending_dir->i_sem) */
3272                 } else if (S_ISREG(new_inode->i_mode)) {
3273                         mds_pack_inode2body(obd, body, new_inode, 0);
3274                         mds_pack_md(obd, req->rq_repmsg, 1, body,
3275                                     new_inode, MDS_PACK_MD_LOCK);
3276                  }
3277         }
3278
3279         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_RENAME_WRITE,
3280                        de_srcdir->d_inode->i_sb);
3281
3282         if (de_old->d_flags & DCACHE_CROSS_REF) {
3283                 struct lustre_id old_id;
3284
3285                 mds_pack_dentry2id(obd, &old_id, de_old, 1);
3286
3287                 rc = mds_add_local_dentry(rec, offset, req, &old_id,
3288                                           de_tgtdir, de_new, 1);
3289                 if (rc)
3290                         GOTO(cleanup, rc);
3291
3292                 rc = mds_del_local_dentry(rec, offset, req, de_srcdir,
3293                                           de_old);
3294                 GOTO(cleanup, rc);
3295         }
3296
3297         lmm = lustre_msg_buf(req->rq_repmsg, 1, 0);
3298         handle = fsfilt_start_log(obd, de_tgtdir->d_inode, FSFILT_OP_RENAME,
3299                                   NULL, le32_to_cpu(lmm->lmm_stripe_count));
3300
3301         if (IS_ERR(handle))
3302                 GOTO(cleanup, rc = PTR_ERR(handle));
3303
3304         lock_kernel();
3305         de_old->d_fsdata = req;
3306         de_new->d_fsdata = req;
3307         rc = vfs_rename(de_srcdir->d_inode, de_old, de_tgtdir->d_inode, de_new);
3308         unlock_kernel();
3309
3310         if (rc == 0 && new_inode != NULL && new_inode->i_nlink == 0) {
3311                 if (mds_orphan_open_count(new_inode) > 0)
3312                         rc = mds_orphan_add_link(rec, obd, de_new);
3313
3314                 if (rc == 1)
3315                         GOTO(cleanup, rc = 0);
3316
3317                 if (!S_ISREG(new_inode->i_mode))
3318                         GOTO(cleanup, rc);
3319
3320                 if (!(body->valid & OBD_MD_FLEASIZE)) {
3321                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
3322                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
3323                 } else if (mds_log_op_unlink(obd, new_inode,
3324                                              lustre_msg_buf(req->rq_repmsg,1,0),
3325                                              req->rq_repmsg->buflens[1],
3326                                              lustre_msg_buf(req->rq_repmsg,2,0),
3327                                              req->rq_repmsg->buflens[2],
3328                                              &lcl) > 0) {
3329                         body->valid |= OBD_MD_FLCOOKIE;
3330                 }
3331         }
3332
3333         EXIT;
3334 cleanup:
3335         rc = mds_finish_transno(mds, (de_tgtdir ? de_tgtdir->d_inode : NULL),
3336                                 handle, req, rc, 0);
3337
3338         switch (cleanup_phase) {
3339         case 3:
3340                 up(&mds->mds_pending_dir->d_inode->i_sem);
3341         case 2:
3342                 if (new_inode)
3343                         UP_READ_I_ALLOC_SEM(new_inode);
3344         case 1:
3345 #ifdef S_PDIROPS
3346                 if (dlm_handles[5].cookie != 0)
3347                         ldlm_lock_decref(&(dlm_handles[5]), LCK_PW);
3348                 if (dlm_handles[6].cookie != 0)
3349                         ldlm_lock_decref(&(dlm_handles[6]), LCK_PW);
3350 #endif
3351                 if (lcl != NULL)
3352                         ptlrpc_save_llog_lock(req, lcl);
3353
3354                 if (rc) {
3355                         if (dlm_handles[3].cookie != 0)
3356                                 ldlm_lock_decref(&(dlm_handles[3]), LCK_EX);
3357                         ldlm_lock_decref(&(dlm_handles[2]), LCK_EX);
3358                         ldlm_lock_decref(&(dlm_handles[1]), LCK_PW);
3359                         ldlm_lock_decref(&(dlm_handles[0]), LCK_PW);
3360                 } else {
3361                         if (dlm_handles[3].cookie != 0)
3362                                 ptlrpc_save_lock(req,&(dlm_handles[3]), LCK_EX);
3363                         ptlrpc_save_lock(req, &(dlm_handles[2]), LCK_EX);
3364                         ptlrpc_save_lock(req, &(dlm_handles[1]), LCK_PW);
3365                         ptlrpc_save_lock(req, &(dlm_handles[0]), LCK_PW);
3366                 }
3367                 l_dput(de_new);
3368                 l_dput(de_old);
3369                 l_dput(de_tgtdir);
3370                 l_dput(de_srcdir);
3371         case 0:
3372                 break;
3373         default:
3374                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
3375                 LBUG();
3376         }
3377         req->rq_status = rc;
3378         return 0;
3379 }
3380
3381 typedef int (*mds_reinter)(struct mds_update_record *, int offset,
3382                            struct ptlrpc_request *, struct lustre_handle *);
3383
3384 static mds_reinter reinters[REINT_MAX + 1] = {
3385         [REINT_SETATTR] mds_reint_setattr,
3386         [REINT_CREATE] mds_reint_create,
3387         [REINT_LINK] mds_reint_link,
3388         [REINT_UNLINK] mds_reint_unlink,
3389         [REINT_RENAME] mds_reint_rename,
3390         [REINT_OPEN] mds_open
3391 };
3392
3393 int mds_reint_rec(struct mds_update_record *rec, int offset,
3394                   struct ptlrpc_request *req, struct lustre_handle *lockh)
3395 {
3396         struct obd_device *obd = req->rq_export->exp_obd;
3397         struct lvfs_run_ctxt saved;
3398         int rc;
3399
3400         /* checked by unpacker */
3401         LASSERT(rec->ur_opcode <= REINT_MAX &&
3402                 reinters[rec->ur_opcode] != NULL);
3403
3404         push_ctxt(&saved, &obd->obd_lvfs_ctxt, &rec->ur_uc);
3405         rc = reinters[rec->ur_opcode] (rec, offset, req, lockh);
3406         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &rec->ur_uc);
3407
3408         return rc;
3409 }