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/obd_support.h>
  35 #include <linux/obd_class.h>
  36 #include <linux/obd.h>
  37 #include <linux/lustre_lib.h>
  38 #include <linux/lustre_idl.h>
  39 #include <linux/lustre_mds.h>
  40 #include <linux/lustre_dlm.h>
  41 #include <linux/lustre_fsfilt.h>
  42
  43 #include "mds_internal.h"
  44
  45 void mds_commit_cb(struct obd_device *obd, __u64 transno, void *data,
  46                    int error)
  47 {
  48         obd_transno_commit_cb(obd, transno, error);
  49 }
  50
  51 struct mds_logcancel_data {
  52         struct lov_mds_md      *mlcd_lmm;
  53         int                     mlcd_size;
  54         int                     mlcd_cookielen;
  55         int                     mlcd_eadatalen;
  56         struct llog_cookie      mlcd_cookies[0];
  57 };
  58
  59
  60 static void mds_cancel_cookies_cb(struct obd_device *obd, __u64 transno,
  61                                   void *cb_data, int error)
  62 {
  63         struct mds_logcancel_data *mlcd = cb_data;
  64         struct lov_stripe_md *lsm = NULL;
  65         struct llog_ctxt *ctxt;
  66         int rc;
  67
  68         obd_transno_commit_cb(obd, transno, error);
  69
  70         CDEBUG(D_HA, "cancelling %d cookies\n",
  71                (int)(mlcd->mlcd_cookielen / sizeof(*mlcd->mlcd_cookies)));
  72
  73         rc = obd_unpackmd(obd->u.mds.mds_osc_exp, &lsm, mlcd->mlcd_lmm,
  74                           mlcd->mlcd_eadatalen);
  75         if (rc < 0) {
  76                 CERROR("bad LSM cancelling %d log cookies: rc %d\n",
  77                        (int)(mlcd->mlcd_cookielen/sizeof(*mlcd->mlcd_cookies)),
  78                        rc);
  79         } else {
  80                 ///* XXX 0 normally, SENDNOW for debug */);
  81                 ctxt = llog_get_context(obd,mlcd->mlcd_cookies[0].lgc_subsys+1);
  82                 rc = llog_cancel(ctxt, lsm, mlcd->mlcd_cookielen /
  83                                                 sizeof(*mlcd->mlcd_cookies),
  84                                  mlcd->mlcd_cookies, OBD_LLOG_FL_SENDNOW);
  85                 if (rc)
  86                         CERROR("error cancelling %d log cookies: rc %d\n",
  87                                (int)(mlcd->mlcd_cookielen /
  88                                      sizeof(*mlcd->mlcd_cookies)), rc);
  89         }
  90
  91         OBD_FREE(mlcd, mlcd->mlcd_size);
  92 }
  93
  94 /* Assumes caller has already pushed us into the kernel context. */
  95 int mds_finish_transno(struct mds_obd *mds, struct inode *inode, void *handle,
  96                        struct ptlrpc_request *req, int rc, __u32 op_data)
  97 {
  98         struct mds_export_data *med = &req->rq_export->exp_mds_data;
  99         struct mds_client_data *mcd = med->med_mcd;
 100         struct obd_device *obd = req->rq_export->exp_obd;
 101         int err;
 102         __u64 transno;
 103         loff_t off;
 104         int log_pri = D_HA;
 105         ENTRY;
 106
 107         /* if the export has already been failed, we have no last_rcvd slot */
 108         if (req->rq_export->exp_failed) {
 109                 CERROR("committing transaction for disconnected client\n");
 110                 if (handle)
 111                         GOTO(commit, rc);
 112                 RETURN(rc);
 113         }
 114
 115         if (IS_ERR(handle))
 116                 RETURN(rc);
 117
 118         if (handle == NULL) {
 119                 /* if we're starting our own xaction, use our own inode */
 120                 inode = mds->mds_rcvd_filp->f_dentry->d_inode;
 121                 handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
 122                 if (IS_ERR(handle)) {
 123                         CERROR("fsfilt_start: %ld\n", PTR_ERR(handle));
 124                         RETURN(PTR_ERR(handle));
 125                 }
 126         }
 127
 128         off = med->med_off;
 129
 130         transno = req->rq_reqmsg->transno;
 131         if (rc != 0) {
 132                 LASSERT(transno == 0);
 133         } else if (transno == 0) {
 134                 spin_lock(&mds->mds_transno_lock);
 135                 transno = ++mds->mds_last_transno;
 136                 spin_unlock(&mds->mds_transno_lock);
 137         } else {
 138                 spin_lock(&mds->mds_transno_lock);
 139                 if (transno > mds->mds_last_transno)
 140                         mds->mds_last_transno = transno;
 141                 spin_unlock(&mds->mds_transno_lock);
 142         }
 143         req->rq_repmsg->transno = req->rq_transno = transno;
 144         mcd->mcd_last_transno = cpu_to_le64(transno);
 145         mcd->mcd_last_xid = cpu_to_le64(req->rq_xid);
 146         mcd->mcd_last_result = cpu_to_le32(rc);
 147         mcd->mcd_last_data = cpu_to_le32(op_data);
 148
 149         fsfilt_add_journal_cb(req->rq_export->exp_obd, transno, handle,
 150                               mds_commit_cb, NULL);
 151         err = fsfilt_write_record(obd, mds->mds_rcvd_filp, mcd, sizeof(*mcd),
 152                                   &off, 0);
 153
 154         if (err) {
 155                 log_pri = D_ERROR;
 156                 if (rc == 0)
 157                         rc = err;
 158         }
 159
 160         DEBUG_REQ(log_pri, req,
 161                   "wrote trans #"LPU64" client %s at idx %u: err = %d",
 162                   transno, mcd->mcd_uuid, med->med_idx, err);
 163
 164         err = mds_lov_write_objids(obd);
 165         if (err) {
 166                 log_pri = D_ERROR;
 167                 if (rc == 0)
 168                         rc = err;
 169         }
 170         CDEBUG(log_pri, "wrote objids: err = %d\n", err);
 171
 172 commit:
 173         err = fsfilt_commit(obd, inode, handle, 0);
 174         if (err) {
 175                 CERROR("error committing transaction: %d\n", err);
 176                 if (!rc)
 177                         rc = err;
 178         }
 179
 180         RETURN(rc);
 181 }
 182
 183 /* this gives the same functionality as the code between
 184  * sys_chmod and inode_setattr
 185  * chown_common and inode_setattr
 186  * utimes and inode_setattr
 187  */
 188 int mds_fix_attr(struct inode *inode, struct mds_update_record *rec)
 189 {
 190         time_t now = LTIME_S(CURRENT_TIME);
 191         struct iattr *attr = &rec->ur_iattr;
 192         unsigned int ia_valid = attr->ia_valid;
 193         int error;
 194         ENTRY;
 195
 196         /* only fix up attrs if the client VFS didn't already */
 197         if (!(ia_valid & ATTR_RAW))
 198                 RETURN(0);
 199
 200         if (!(ia_valid & ATTR_CTIME_SET))
 201                 LTIME_S(attr->ia_ctime) = now;
 202         if (!(ia_valid & ATTR_ATIME_SET))
 203                 LTIME_S(attr->ia_atime) = now;
 204         if (!(ia_valid & ATTR_MTIME_SET))
 205                 LTIME_S(attr->ia_mtime) = now;
 206
 207         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 208                 RETURN(-EPERM);
 209
 210         /* times */
 211         if ((ia_valid & (ATTR_MTIME|ATTR_ATIME)) == (ATTR_MTIME|ATTR_ATIME)) {
 212                 if (rec->ur_fsuid != inode->i_uid &&
 213                     (error = ll_permission(inode, MAY_WRITE, NULL)) != 0)
 214                         RETURN(error);
 215         }
 216
 217         if (ia_valid & ATTR_SIZE) {
 218                 if ((error = ll_permission(inode, MAY_WRITE, NULL)) != 0)
 219                         RETURN(error);
 220         }
 221
 222         if (ia_valid & ATTR_UID) {
 223                 /* chown */
 224                 error = -EPERM;
 225                 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 226                         RETURN(-EPERM);
 227                 if (attr->ia_uid == (uid_t) -1)
 228                         attr->ia_uid = inode->i_uid;
 229                 if (attr->ia_gid == (gid_t) -1)
 230                         attr->ia_gid = inode->i_gid;
 231                 attr->ia_mode = inode->i_mode;
 232                 /*
 233                  * If the user or group of a non-directory has been
 234                  * changed by a non-root user, remove the setuid bit.
 235                  * 19981026 David C Niemi <niemi@tux.org>
 236                  *
 237                  * Changed this to apply to all users, including root,
 238                  * to avoid some races. This is the behavior we had in
 239                  * 2.0. The check for non-root was definitely wrong
 240                  * for 2.2 anyway, as it should have been using
 241                  * CAP_FSETID rather than fsuid -- 19990830 SD.
 242                  */
 243                 if ((inode->i_mode & S_ISUID) == S_ISUID &&
 244                     !S_ISDIR(inode->i_mode)) {
 245                         attr->ia_mode &= ~S_ISUID;
 246                         attr->ia_valid |= ATTR_MODE;
 247                 }
 248                 /*
 249                  * Likewise, if the user or group of a non-directory
 250                  * has been changed by a non-root user, remove the
 251                  * setgid bit UNLESS there is no group execute bit
 252                  * (this would be a file marked for mandatory
 253                  * locking).  19981026 David C Niemi <niemi@tux.org>
 254                  *
 255                  * Removed the fsuid check (see the comment above) --
 256                  * 19990830 SD.
 257                  */
 258                 if (((inode->i_mode & (S_ISGID | S_IXGRP)) ==
 259                      (S_ISGID | S_IXGRP)) && !S_ISDIR(inode->i_mode)) {
 260                         attr->ia_mode &= ~S_ISGID;
 261                         attr->ia_valid |= ATTR_MODE;
 262                 }
 263         } else if (ia_valid & ATTR_MODE) {
 264                 int mode = attr->ia_mode;
 265                 /* chmod */
 266                 if (attr->ia_mode == (mode_t) -1)
 267                         attr->ia_mode = inode->i_mode;
 268                 attr->ia_mode =
 269                         (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
 270         }
 271         RETURN(0);
 272 }
 273
 274 void mds_steal_ack_locks(struct ptlrpc_request *req)
 275 {
 276         struct obd_export         *exp = req->rq_export;
 277         struct list_head          *tmp;
 278         struct ptlrpc_reply_state *oldrep;
 279         struct ptlrpc_service     *svc;
 280         unsigned long              flags;
 281         int                        i;
 282
 283         /* CAVEAT EMPTOR: spinlock order */
 284         spin_lock_irqsave (&exp->exp_lock, flags);
 285         list_for_each (tmp, &exp->exp_outstanding_replies) {
 286                 oldrep = list_entry(tmp, struct ptlrpc_reply_state,rs_exp_list);
 287
 288                 if (oldrep->rs_xid != req->rq_xid)
 289                         continue;
 290
 291                 if (oldrep->rs_msg.opc != req->rq_reqmsg->opc)
 292                         CERROR ("Resent req xid "LPX64" has mismatched opc: "
 293                                 "new %d old %d\n", req->rq_xid,
 294                                 req->rq_reqmsg->opc, oldrep->rs_msg.opc);
 295
 296                 svc = oldrep->rs_srv_ni->sni_service;
 297                 spin_lock (&svc->srv_lock);
 298
 299                 list_del_init (&oldrep->rs_exp_list);
 300
 301                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
 302                       " o%d NID"LPX64"\n",
 303                       oldrep->rs_nlocks, oldrep,
 304                       oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_msg.opc,
 305                       exp->exp_connection->c_peer.peer_nid);
 306
 307                 for (i = 0; i < oldrep->rs_nlocks; i++)
 308                         ptlrpc_save_lock(req,
 309                                          &oldrep->rs_locks[i],
 310                                          oldrep->rs_modes[i]);
 311                 oldrep->rs_nlocks = 0;
 312
 313                 DEBUG_REQ(D_HA, req, "stole locks for");
 314                 ptlrpc_schedule_difficult_reply (oldrep);
 315
 316                 spin_unlock (&svc->srv_lock);
 317                 spin_unlock_irqrestore (&exp->exp_lock, flags);
 318                 return;
 319         }
 320         spin_unlock_irqrestore (&exp->exp_lock, flags);
 321 }
 322
 323 void mds_req_from_mcd(struct ptlrpc_request *req, struct mds_client_data *mcd)
 324 {
 325         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
 326                   mcd->mcd_last_transno, mcd->mcd_last_result);
 327         req->rq_repmsg->transno = req->rq_transno = mcd->mcd_last_transno;
 328         req->rq_repmsg->status = req->rq_status = mcd->mcd_last_result;
 329
 330         mds_steal_ack_locks(req);
 331 }
 332
 333 static void reconstruct_reint_setattr(struct mds_update_record *rec,
 334                                       int offset, struct ptlrpc_request *req)
 335 {
 336         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 337         struct mds_obd *obd = &req->rq_export->exp_obd->u.mds;
 338         struct dentry *de;
 339         struct mds_body *body;
 340
 341         mds_req_from_mcd(req, med->med_mcd);
 342
 343         de = mds_fid2dentry(obd, rec->ur_fid1, NULL);
 344         if (IS_ERR(de)) {
 345                 LASSERT(PTR_ERR(de) == req->rq_status);
 346                 return;
 347         }
 348
 349         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 350         mds_pack_inode2fid(&body->fid1, de->d_inode);
 351         mds_pack_inode2body(body, de->d_inode);
 352
 353         /* Don't return OST-specific attributes if we didn't just set them */
 354         if (rec->ur_iattr.ia_valid & ATTR_SIZE)
 355                 body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 356         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET))
 357                 body->valid |= OBD_MD_FLMTIME;
 358         if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET))
 359                 body->valid |= OBD_MD_FLATIME;
 360
 361         l_dput(de);
 362 }
 363
 364 /* In the raw-setattr case, we lock the child inode.
 365  * In the write-back case or if being called from open, the client holds a lock
 366  * already.
 367  *
 368  * We use the ATTR_FROM_OPEN flag to tell these cases apart. */
 369 static int mds_reint_setattr(struct mds_update_record *rec, int offset,
 370                              struct ptlrpc_request *req,
 371                              struct lustre_handle *lh)
 372 {
 373         struct mds_obd *mds = mds_req2mds(req);
 374         struct obd_device *obd = req->rq_export->exp_obd;
 375         struct mds_body *body;
 376         struct dentry *de;
 377         struct inode *inode = NULL;
 378         struct lustre_handle lockh;
 379         void *handle = NULL;
 380         struct mds_logcancel_data *mlcd = NULL;
 381         int rc = 0, cleanup_phase = 0, err, locked = 0;
 382         ENTRY;
 383
 384         LASSERT(offset == 0);
 385
 386         DEBUG_REQ(D_INODE, req, "setattr "LPU64"/%u %x", rec->ur_fid1->id,
 387                   rec->ur_fid1->generation, rec->ur_iattr.ia_valid);
 388
 389         MDS_CHECK_RESENT(req, reconstruct_reint_setattr(rec, offset, req));
 390
 391         if (rec->ur_iattr.ia_valid & ATTR_FROM_OPEN) {
 392                 de = mds_fid2dentry(mds, rec->ur_fid1, NULL);
 393                 if (IS_ERR(de))
 394                         GOTO(cleanup, rc = PTR_ERR(de));
 395         } else {
 396                 __u64 lockpart = MDS_INODELOCK_UPDATE;
 397                 if (rec->ur_iattr.ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID) )
 398                         lockpart |= MDS_INODELOCK_LOOKUP;
 399                 de = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL, LCK_PW,
 400                                            &lockh, NULL, 0, lockpart);
 401                 if (IS_ERR(de))
 402                         GOTO(cleanup, rc = PTR_ERR(de));
 403                 locked = 1;
 404         }
 405
 406         cleanup_phase = 1;
 407
 408         inode = de->d_inode;
 409         LASSERT(inode);
 410         if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 411             rec->ur_eadata != NULL)
 412                 down(&inode->i_sem);
 413
 414         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_SETATTR_WRITE, inode->i_sb);
 415
 416         handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
 417         if (IS_ERR(handle))
 418                 GOTO(cleanup, rc = PTR_ERR(handle));
 419
 420         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_CTIME))
 421                 CDEBUG(D_INODE, "setting mtime %lu, ctime %lu\n",
 422                        LTIME_S(rec->ur_iattr.ia_mtime),
 423                        LTIME_S(rec->ur_iattr.ia_ctime));
 424         rc = mds_fix_attr(inode, rec);
 425         if (rc)
 426                 GOTO(cleanup, rc);
 427
 428         if (rec->ur_iattr.ia_valid & ATTR_ATTR_FLAG)    /* ioctl */
 429                 rc = fsfilt_iocontrol(obd, inode, NULL, EXT3_IOC_SETFLAGS,
 430                                       (long)&rec->ur_iattr.ia_attr_flags);
 431         else                                            /* setattr */
 432                 rc = fsfilt_setattr(obd, de, handle, &rec->ur_iattr, 0);
 433
 434         if (rc == 0 && (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 435             rec->ur_eadata != NULL) {
 436                 struct lov_stripe_md *lsm = NULL;
 437
 438                 rc = ll_permission(inode, MAY_WRITE, NULL);
 439                 if (rc < 0)
 440                         GOTO(cleanup, rc);
 441
 442                 rc = obd_iocontrol(OBD_IOC_LOV_SETSTRIPE,
 443                                    mds->mds_osc_exp, 0, &lsm, rec->ur_eadata);
 444                 if (rc)
 445                         GOTO(cleanup, rc);
 446
 447                 obd_free_memmd(mds->mds_osc_exp, &lsm);
 448
 449                 rc = fsfilt_set_md(obd, inode, handle, rec->ur_eadata,
 450                                    rec->ur_eadatalen);
 451                 if (rc)
 452                         GOTO(cleanup, rc);
 453         }
 454
 455         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 456         mds_pack_inode2fid(&body->fid1, inode);
 457         mds_pack_inode2body(body, inode);
 458
 459         /* Don't return OST-specific attributes if we didn't just set them */
 460         if (rec->ur_iattr.ia_valid & ATTR_SIZE)
 461                 body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 462         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET))
 463                 body->valid |= OBD_MD_FLMTIME;
 464         if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET))
 465                 body->valid |= OBD_MD_FLATIME;
 466
 467         if (rc == 0 && rec->ur_cookielen && !IS_ERR(mds->mds_osc_obd)) {
 468                 OBD_ALLOC(mlcd, sizeof(*mlcd) + rec->ur_cookielen +
 469                           rec->ur_eadatalen);
 470                 if (mlcd) {
 471                         mlcd->mlcd_size = sizeof(*mlcd) + rec->ur_cookielen +
 472                                 rec->ur_eadatalen;
 473                         mlcd->mlcd_eadatalen = rec->ur_eadatalen;
 474                         mlcd->mlcd_cookielen = rec->ur_cookielen;
 475                         mlcd->mlcd_lmm = (void *)&mlcd->mlcd_cookies +
 476                                 mlcd->mlcd_cookielen;
 477                         memcpy(&mlcd->mlcd_cookies, rec->ur_logcookies,
 478                                mlcd->mlcd_cookielen);
 479                         memcpy(mlcd->mlcd_lmm, rec->ur_eadata,
 480                                mlcd->mlcd_eadatalen);
 481                 } else {
 482                         CERROR("unable to allocate log cancel data\n");
 483                 }
 484         }
 485         EXIT;
 486  cleanup:
 487         if (mlcd != NULL)
 488                 fsfilt_add_journal_cb(req->rq_export->exp_obd, 0, handle,
 489                                       mds_cancel_cookies_cb, mlcd);
 490         err = mds_finish_transno(mds, inode, handle, req, rc, 0);
 491         switch (cleanup_phase) {
 492         case 1:
 493                 if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 494                     rec->ur_eadata != NULL)
 495                         up(&inode->i_sem);
 496                 l_dput(de);
 497                 if (locked) {
 498                         if (rc) {
 499                                 ldlm_lock_decref(&lockh, LCK_PW);
 500                         } else {
 501                                 ptlrpc_save_lock (req, &lockh, LCK_PW);
 502                         }
 503                 }
 504         case 0:
 505                 break;
 506         default:
 507                 LBUG();
 508         }
 509         if (err && !rc)
 510                 rc = err;
 511
 512         req->rq_status = rc;
 513         return 0;
 514 }
 515
 516 static void reconstruct_reint_create(struct mds_update_record *rec, int offset,
 517                                      struct ptlrpc_request *req)
 518 {
 519         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 520         struct mds_obd *obd = &req->rq_export->exp_obd->u.mds;
 521         struct dentry *parent, *child;
 522         struct mds_body *body;
 523
 524         mds_req_from_mcd(req, med->med_mcd);
 525
 526         if (req->rq_status)
 527                 return;
 528
 529         parent = mds_fid2dentry(obd, rec->ur_fid1, NULL);
 530         LASSERT(!IS_ERR(parent));
 531         child = ll_lookup_one_len(rec->ur_name, parent, rec->ur_namelen - 1);
 532         LASSERT(!IS_ERR(child));
 533         body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
 534         mds_pack_inode2fid(&body->fid1, child->d_inode);
 535         mds_pack_inode2body(body, child->d_inode);
 536         l_dput(parent);
 537         l_dput(child);
 538 }
 539
 540 static int mds_reint_create(struct mds_update_record *rec, int offset,
 541                             struct ptlrpc_request *req,
 542                             struct lustre_handle *lh)
 543 {
 544         struct dentry *dparent = NULL;
 545         struct mds_obd *mds = mds_req2mds(req);
 546         struct obd_device *obd = req->rq_export->exp_obd;
 547         struct dentry *dchild = NULL;
 548         struct inode *dir = NULL;
 549         void *handle = NULL;
 550         struct lustre_handle lockh;
 551         int rc = 0, err, type = rec->ur_mode & S_IFMT, cleanup_phase = 0;
 552         int created = 0;
 553         struct dentry_params dp;
 554         ENTRY;
 555
 556         LASSERT(offset == 0);
 557         LASSERT(!strcmp(req->rq_export->exp_obd->obd_type->typ_name, "mds"));
 558
 559         DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u name %s mode %o",
 560                   rec->ur_fid1->id, rec->ur_fid1->generation,
 561                   rec->ur_name, rec->ur_mode);
 562
 563         MDS_CHECK_RESENT(req, reconstruct_reint_create(rec, offset, req));
 564
 565         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_CREATE))
 566                 GOTO(cleanup, rc = -ESTALE);
 567
 568         dparent = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL, LCK_PW, &lockh,
 569                                         rec->ur_name, rec->ur_namelen - 1,
 570                                         MDS_INODELOCK_UPDATE);
 571         if (IS_ERR(dparent)) {
 572                 rc = PTR_ERR(dparent);
 573                 CERROR("parent lookup error %d\n", rc);
 574                 GOTO(cleanup, rc);
 575         }
 576         cleanup_phase = 1; /* locked parent dentry */
 577         dir = dparent->d_inode;
 578         LASSERT(dir);
 579
 580         ldlm_lock_dump_handle(D_OTHER, &lockh);
 581
 582         dchild = ll_lookup_one_len(rec->ur_name, dparent, rec->ur_namelen - 1);
 583         if (IS_ERR(dchild)) {
 584                 rc = PTR_ERR(dchild);
 585                 CERROR("child lookup error %d\n", rc);
 586                 GOTO(cleanup, rc);
 587         }
 588
 589         cleanup_phase = 2; /* child dentry */
 590
 591         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_CREATE_WRITE, dir->i_sb);
 592
 593         if (dir->i_mode & S_ISGID) {
 594                 if (S_ISDIR(rec->ur_mode))
 595                         rec->ur_mode |= S_ISGID;
 596         }
 597
 598         dchild->d_fsdata = (void *)&dp;
 599         dp.p_inum = (unsigned long)rec->ur_fid2->id;
 600         dp.p_ptr = req;
 601
 602         switch (type) {
 603         case S_IFREG:{
 604                 handle = fsfilt_start(obd, dir, FSFILT_OP_CREATE, NULL);
 605                 if (IS_ERR(handle))
 606                         GOTO(cleanup, rc = PTR_ERR(handle));
 607                 rc = ll_vfs_create(dir, dchild, rec->ur_mode, NULL);
 608                 EXIT;
 609                 break;
 610         }
 611         case S_IFDIR:{
 612                 handle = fsfilt_start(obd, dir, FSFILT_OP_MKDIR, NULL);
 613                 if (IS_ERR(handle))
 614                         GOTO(cleanup, rc = PTR_ERR(handle));
 615                 rc = vfs_mkdir(dir, dchild, rec->ur_mode);
 616                 EXIT;
 617                 break;
 618         }
 619         case S_IFLNK:{
 620                 handle = fsfilt_start(obd, dir, FSFILT_OP_SYMLINK, NULL);
 621                 if (IS_ERR(handle))
 622                         GOTO(cleanup, rc = PTR_ERR(handle));
 623                 if (rec->ur_tgt == NULL)        /* no target supplied */
 624                         rc = -EINVAL;           /* -EPROTO? */
 625                 else
 626                         rc = vfs_symlink(dir, dchild, rec->ur_tgt);
 627                 EXIT;
 628                 break;
 629         }
 630         case S_IFCHR:
 631         case S_IFBLK:
 632         case S_IFIFO:
 633         case S_IFSOCK:{
 634                 int rdev = rec->ur_rdev;
 635                 handle = fsfilt_start(obd, dir, FSFILT_OP_MKNOD, NULL);
 636                 if (IS_ERR(handle))
 637                         GOTO(cleanup, (handle = NULL, rc = PTR_ERR(handle)));
 638                 rc = vfs_mknod(dir, dchild, rec->ur_mode, rdev);
 639                 EXIT;
 640                 break;
 641         }
 642         default:
 643                 CERROR("bad file type %o creating %s\n", type, rec->ur_name);
 644                 dchild->d_fsdata = NULL;
 645                 GOTO(cleanup, rc = -EINVAL);
 646         }
 647
 648         /* In case we stored the desired inum in here, we want to clean up. */
 649         if (dchild->d_fsdata == (void *)(unsigned long)rec->ur_fid2->id)
 650                 dchild->d_fsdata = NULL;
 651
 652         if (rc) {
 653                 CDEBUG(D_INODE, "error during create: %d\n", rc);
 654                 GOTO(cleanup, rc);
 655         } else {
 656                 struct iattr iattr;
 657                 struct inode *inode = dchild->d_inode;
 658                 struct mds_body *body;
 659
 660                 created = 1;
 661                 LTIME_S(iattr.ia_atime) = rec->ur_time;
 662                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
 663                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
 664                 iattr.ia_uid = rec->ur_fsuid;
 665                 if (dir->i_mode & S_ISGID)
 666                         iattr.ia_gid = dir->i_gid;
 667                 else
 668                         iattr.ia_gid = rec->ur_fsgid;
 669                 iattr.ia_valid = ATTR_UID | ATTR_GID | ATTR_ATIME |
 670                         ATTR_MTIME | ATTR_CTIME;
 671
 672                 if (rec->ur_fid2->id) {
 673                         LASSERT(rec->ur_fid2->id == inode->i_ino);
 674                         inode->i_generation = rec->ur_fid2->generation;
 675                         /* Dirtied and committed by the upcoming setattr. */
 676                         CDEBUG(D_INODE, "recreated ino %lu with gen %u\n",
 677                                inode->i_ino, inode->i_generation);
 678                 } else {
 679                         struct lustre_handle child_ino_lockh;
 680
 681                         CDEBUG(D_INODE, "created ino %lu with gen %x\n",
 682                                inode->i_ino, inode->i_generation);
 683
 684                         /* The inode we were allocated may have just been freed
 685                          * by an unlink operation.  We take this lock to
 686                          * synchronize against the matching reply-ack-lock taken
 687                          * in unlink, to avoid replay problems if this reply
 688                          * makes it out to the client but the unlink's does not.
 689                          * See bug 2029 for more detail.*/
 690                         rc = mds_lock_new_child(obd, inode, &child_ino_lockh);
 691                         if (rc != ELDLM_OK) {
 692                                 CERROR("error locking for unlink/create sync: "
 693                                        "%d\n", rc);
 694                         } else {
 695                                 ldlm_lock_decref(&child_ino_lockh, LCK_EX);
 696                         }
 697                 }
 698
 699                 rc = fsfilt_setattr(obd, dchild, handle, &iattr, 0);
 700                 if (rc)
 701                         CERROR("error on child setattr: rc = %d\n", rc);
 702
 703                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
 704                 rc = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
 705                 if (rc)
 706                         CERROR("error on parent setattr: rc = %d\n", rc);
 707
 708                 body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
 709                 mds_pack_inode2fid(&body->fid1, inode);
 710                 mds_pack_inode2body(body, inode);
 711         }
 712         EXIT;
 713
 714 cleanup:
 715         err = mds_finish_transno(mds, dir, handle, req, rc, 0);
 716
 717         if (rc && created) {
 718                 /* Destroy the file we just created.  This should not need
 719                  * extra journal credits, as we have already modified all of
 720                  * the blocks needed in order to create the file in the first
 721                  * place.
 722                  */
 723                 switch (type) {
 724                 case S_IFDIR:
 725                         err = vfs_rmdir(dir, dchild);
 726                         if (err)
 727                                 CERROR("rmdir in error path: %d\n", err);
 728                         break;
 729                 default:
 730                         err = vfs_unlink(dir, dchild);
 731                         if (err)
 732                                 CERROR("unlink in error path: %d\n", err);
 733                         break;
 734                 }
 735         } else {
 736                 rc = err;
 737         }
 738         switch (cleanup_phase) {
 739         case 2: /* child dentry */
 740                 l_dput(dchild);
 741         case 1: /* locked parent dentry */
 742                 if (rc) {
 743                         ldlm_lock_decref(&lockh, LCK_PW);
 744                 } else {
 745                         ptlrpc_save_lock (req, &lockh, LCK_PW);
 746                 }
 747                 l_dput(dparent);
 748         case 0:
 749                 break;
 750         default:
 751                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
 752                 LBUG();
 753         }
 754         req->rq_status = rc;
 755         return 0;
 756 }
 757
 758 static int res_gt(struct ldlm_res_id *res1, struct ldlm_res_id *res2,
 759            ldlm_policy_data_t *p1, ldlm_policy_data_t *p2)
 760 {
 761         int i;
 762
 763         for (i = 0; i < RES_NAME_SIZE; i++) {
 764                 /* return 1 here, because enqueue_ordered will skip resources
 765                  * of all zeroes if they're sorted to the end of the list. */
 766                 if (res1->name[i] == 0 && res2->name[i] != 0)
 767                         return 1;
 768                 if (res2->name[i] == 0 && res1->name[i] != 0)
 769                         return 0;
 770
 771                 if (res1->name[i] > res2->name[i])
 772                         return 1;
 773                 if (res1->name[i] < res2->name[i])
 774                         return 0;
 775         }
 776
 777         if (!p1 || !p2)
 778                 return 0;
 779
 780         if (memcmp(p1, p2, sizeof(*p1)) < 0)
 781                 return 1;
 782
 783         return 0;
 784 }
 785
 786 /* This function doesn't use ldlm_match_or_enqueue because we're always called
 787  * with EX or PW locks, and the MDS is no longer allowed to match write locks,
 788  * because they take the place of local semaphores.
 789  *
 790  * One or two locks are taken in numerical order.  A res_id->name[0] of 0 means
 791  * no lock is taken for that res_id.  Must be at least one non-zero res_id. */
 792 int enqueue_ordered_locks(struct obd_device *obd, struct ldlm_res_id *p1_res_id,
 793                           struct lustre_handle *p1_lockh, int p1_lock_mode,
 794                           ldlm_policy_data_t *p1_policy,
 795                           struct ldlm_res_id *p2_res_id,
 796                           struct lustre_handle *p2_lockh, int p2_lock_mode,
 797                           ldlm_policy_data_t *p2_policy)
 798 {
 799         struct ldlm_res_id *res_id[2] = { p1_res_id, p2_res_id };
 800         struct lustre_handle *handles[2] = { p1_lockh, p2_lockh };
 801         int lock_modes[2] = { p1_lock_mode, p2_lock_mode };
 802         ldlm_policy_data_t *policies[2] = { p1_policy, p2_policy };
 803         int rc, flags;
 804         ENTRY;
 805
 806         LASSERT(p1_res_id != NULL && p2_res_id != NULL);
 807
 808         CDEBUG(D_INFO, "locks before: "LPU64"/"LPU64"\n", res_id[0]->name[0],
 809                res_id[1]->name[0]);
 810
 811         if (res_gt(p1_res_id, p2_res_id, p1_policy, p2_policy)) {
 812                 handles[1] = p1_lockh;
 813                 handles[0] = p2_lockh;
 814                 res_id[1] = p1_res_id;
 815                 res_id[0] = p2_res_id;
 816                 lock_modes[1] = p1_lock_mode;
 817                 lock_modes[0] = p2_lock_mode;
 818                 policies[1] = p1_policy;
 819                 policies[0] = p2_policy;
 820         }
 821
 822         CDEBUG(D_DLMTRACE, "lock order: "LPU64"/"LPU64"\n",
 823                res_id[0]->name[0], res_id[1]->name[0]);
 824
 825         flags = LDLM_FL_LOCAL_ONLY;
 826         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, *res_id[0],
 827                               LDLM_IBITS, policies[0], lock_modes[0], &flags,
 828                               mds_blocking_ast, ldlm_completion_ast, NULL, NULL,
 829                               NULL, 0, NULL, handles[0]);
 830         if (rc != ELDLM_OK)
 831                 RETURN(-EIO);
 832         ldlm_lock_dump_handle(D_OTHER, handles[0]);
 833
 834         if (!memcmp(res_id[0], res_id[1], sizeof(*res_id[0])) &&
 835             (policies[0]->l_inodebits.bits & policies[1]->l_inodebits.bits)) {
 836                 memcpy(handles[1], handles[0], sizeof(*(handles[1])));
 837                 ldlm_lock_addref(handles[1], lock_modes[1]);
 838         } else if (res_id[1]->name[0] != 0) {
 839                 flags = LDLM_FL_LOCAL_ONLY;
 840                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
 841                                       *res_id[1], LDLM_IBITS, policies[1],
 842                                       lock_modes[1], &flags, mds_blocking_ast,
 843                                       ldlm_completion_ast, NULL, NULL, NULL, 0,
 844                                       NULL, handles[1]);
 845                 if (rc != ELDLM_OK) {
 846                         ldlm_lock_decref(handles[0], lock_modes[0]);
 847                         RETURN(-EIO);
 848                 }
 849                 ldlm_lock_dump_handle(D_OTHER, handles[1]);
 850         }
 851
 852         RETURN(0);
 853 }
 854
 855 int enqueue_4ordered_locks(struct obd_device *obd,struct ldlm_res_id *p1_res_id,
 856                            struct lustre_handle *p1_lockh, int p1_lock_mode,
 857                            ldlm_policy_data_t *p1_policy,
 858                            struct ldlm_res_id *p2_res_id,
 859                            struct lustre_handle *p2_lockh, int p2_lock_mode,
 860                            ldlm_policy_data_t *p2_policy,
 861                            struct ldlm_res_id *c1_res_id,
 862                            struct lustre_handle *c1_lockh, int c1_lock_mode,
 863                            ldlm_policy_data_t *c1_policy,
 864                            struct ldlm_res_id *c2_res_id,
 865                            struct lustre_handle *c2_lockh, int c2_lock_mode,
 866                            ldlm_policy_data_t *c2_policy)
 867 {
 868         struct ldlm_res_id *res_id[5] = { p1_res_id, p2_res_id,
 869                                           c1_res_id, c2_res_id };
 870         struct lustre_handle *dlm_handles[5] = { p1_lockh, p2_lockh,
 871                                                  c1_lockh, c2_lockh };
 872         int lock_modes[5] = { p1_lock_mode, p2_lock_mode,
 873                               c1_lock_mode, c2_lock_mode };
 874         ldlm_policy_data_t *policies[5] = { p1_policy, p2_policy,
 875                                             c1_policy, c2_policy};
 876         int rc, i, j, sorted, flags;
 877         ENTRY;
 878
 879         CDEBUG(D_DLMTRACE,
 880                "locks before: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n",
 881                res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0],
 882                res_id[3]->name[0]);
 883
 884         /* simple insertion sort - we have at most 4 elements */
 885         for (i = 1; i < 4; i++) {
 886                 j = i - 1;
 887                 dlm_handles[4] = dlm_handles[i];
 888                 res_id[4] = res_id[i];
 889                 lock_modes[4] = lock_modes[i];
 890                 policies[4] = policies[i];
 891
 892                 sorted = 0;
 893                 do {
 894                         if (res_gt(res_id[j], res_id[4], policies[j],
 895                                    policies[4])) {
 896                                 dlm_handles[j + 1] = dlm_handles[j];
 897                                 res_id[j + 1] = res_id[j];
 898                                 lock_modes[j + 1] = lock_modes[j];
 899                                 policies[j + 1] = policies[j];
 900                                 j--;
 901                         } else {
 902                                 sorted = 1;
 903                         }
 904                 } while (j >= 0 && !sorted);
 905
 906                 dlm_handles[j + 1] = dlm_handles[4];
 907                 res_id[j + 1] = res_id[4];
 908                 lock_modes[j + 1] = lock_modes[4];
 909                 policies[j + 1] = policies[4];
 910         }
 911
 912         CDEBUG(D_DLMTRACE,
 913                "lock order: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n",
 914                res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0],
 915                res_id[3]->name[0]);
 916
 917         /* XXX we could send ASTs on all these locks first before blocking? */
 918         for (i = 0; i < 4; i++) {
 919                 flags = 0;
 920                 if (res_id[i]->name[0] == 0)
 921                         break;
 922                 if (i != 0 &&
 923                     !memcmp(res_id[i], res_id[i-1], sizeof(*res_id[i])) &&
 924                     (policies[i]->l_inodebits.bits &
 925                      policies[i-1]->l_inodebits.bits) ) {
 926                         memcpy(dlm_handles[i], dlm_handles[i-1],
 927                                sizeof(*(dlm_handles[i])));
 928                         ldlm_lock_addref(dlm_handles[i], lock_modes[i]);
 929                 } else {
 930                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
 931                                               *res_id[i], LDLM_IBITS,
 932                                               policies[i],
 933                                               lock_modes[i], &flags,
 934                                               mds_blocking_ast,
 935                                               ldlm_completion_ast, NULL, NULL,
 936                                               NULL, 0, NULL, dlm_handles[i]);
 937                         if (rc != ELDLM_OK)
 938                                 GOTO(out_err, rc = -EIO);
 939                         ldlm_lock_dump_handle(D_OTHER, dlm_handles[i]);
 940                 }
 941         }
 942
 943         RETURN(0);
 944 out_err:
 945         while (i-- > 0)
 946                 ldlm_lock_decref(dlm_handles[i], lock_modes[i]);
 947
 948         return rc;
 949 }
 950
 951 /* In the unlikely case that the child changed while we were waiting
 952  * on the lock, we need to drop the lock on the old child and either:
 953  * - if the child has a lower resource name, then we have to also
 954  *   drop the parent lock and regain the locks in the right order
 955  * - in the rename case, if the child has a lower resource name than one of
 956  *   the other parent/child resources (maxres) we also need to reget the locks
 957  * - if the child has a higher resource name (this is the common case)
 958  *   we can just get the lock on the new child (still in lock order)
 959  *
 960  * Returns 0 if the child did not change or if it changed but could be locked.
 961  * Returns 1 if the child changed and we need to re-lock (no locks held).
 962  * Returns -ve error with a valid dchild (no locks held). */
 963 static int mds_verify_child(struct obd_device *obd,
 964                             struct ldlm_res_id *parent_res_id,
 965                             struct lustre_handle *parent_lockh,
 966                             struct dentry *dparent, int parent_mode,
 967                             struct ldlm_res_id *child_res_id,
 968                             struct lustre_handle *child_lockh,
 969                             struct dentry **dchildp, int child_mode,
 970                             ldlm_policy_data_t *child_policy,
 971                             const char *name, int namelen,
 972                             struct ldlm_res_id *maxres)
 973 {
 974         struct dentry *vchild, *dchild = *dchildp;
 975         int rc = 0, cleanup_phase = 2; /* parent, child locks */
 976         ENTRY;
 977
 978         vchild = ll_lookup_one_len(name, dparent, namelen - 1);
 979         if (IS_ERR(vchild))
 980                 GOTO(cleanup, rc = PTR_ERR(vchild));
 981
 982         if (likely((vchild->d_inode == NULL && child_res_id->name[0] == 0) ||
 983                    (vchild->d_inode != NULL &&
 984                     child_res_id->name[0] == vchild->d_inode->i_ino &&
 985                     child_res_id->name[1] == vchild->d_inode->i_generation))) {
 986                 if (dchild != NULL)
 987                         l_dput(dchild);
 988                 *dchildp = vchild;
 989
 990                 RETURN(0);
 991         }
 992
 993         CDEBUG(D_DLMTRACE, "child inode changed: %p != %p (%lu != "LPU64")\n",
 994                vchild->d_inode, dchild ? dchild->d_inode : 0,
 995                vchild->d_inode ? vchild->d_inode->i_ino : 0,
 996                child_res_id->name[0]);
 997         if (child_res_id->name[0] != 0)
 998                 ldlm_lock_decref(child_lockh, child_mode);
 999         if (dchild)
1000                 l_dput(dchild);
1001
1002         cleanup_phase = 1; /* parent lock only */
1003         *dchildp = dchild = vchild;
1004
1005         if (dchild->d_inode) {
1006                 int flags = 0;
1007                 child_res_id->name[0] = dchild->d_inode->i_ino;
1008                 child_res_id->name[1] = dchild->d_inode->i_generation;
1009
1010                 if (res_gt(parent_res_id, child_res_id, NULL, NULL) ||
1011                     res_gt(maxres, child_res_id, NULL, NULL)) {
1012                         CDEBUG(D_DLMTRACE, "relock "LPU64"<("LPU64"|"LPU64")\n",
1013                                child_res_id->name[0], parent_res_id->name[0],
1014                                maxres->name[0]);
1015                         GOTO(cleanup, rc = 1);
1016                 }
1017
1018                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1019                                       *child_res_id, LDLM_IBITS, child_policy,
1020                                       child_mode, &flags, mds_blocking_ast,
1021                                       ldlm_completion_ast, NULL, NULL, NULL, 0,
1022                                       NULL, child_lockh);
1023                 if (rc != ELDLM_OK)
1024                         GOTO(cleanup, rc = -EIO);
1025
1026         } else {
1027                 memset(child_res_id, 0, sizeof(*child_res_id));
1028         }
1029
1030         EXIT;
1031 cleanup:
1032         if (rc) {
1033                 switch(cleanup_phase) {
1034                 case 2:
1035                         if (child_res_id->name[0] != 0)
1036                                 ldlm_lock_decref(child_lockh, child_mode);
1037                 case 1:
1038                         ldlm_lock_decref(parent_lockh, parent_mode);
1039                 }
1040         }
1041         return rc;
1042 }
1043
1044 int mds_get_parent_child_locked(struct obd_device *obd, struct mds_obd *mds,
1045                                 struct ll_fid *fid,
1046                                 struct lustre_handle *parent_lockh,
1047                                 struct dentry **dparentp, int parent_mode,
1048                                 __u64 parent_lockpart,
1049                                 char *name, int namelen,
1050                                 struct lustre_handle *child_lockh,
1051                                 struct dentry **dchildp, int child_mode,
1052                                 __u64 child_lockpart)
1053 {
1054         struct ldlm_res_id child_res_id = { .name = {0} };
1055         struct ldlm_res_id parent_res_id = { .name = {0} };
1056         ldlm_policy_data_t parent_policy = {.l_inodebits = { parent_lockpart }};
1057         ldlm_policy_data_t child_policy = {.l_inodebits = { child_lockpart }};
1058         struct inode *inode;
1059         int rc = 0, cleanup_phase = 0;
1060         ENTRY;
1061
1062         /* Step 1: Lookup parent */
1063         *dparentp = mds_fid2dentry(mds, fid, NULL);
1064         if (IS_ERR(*dparentp))
1065                 RETURN(rc = PTR_ERR(*dparentp));
1066         LASSERT((*dparentp)->d_inode);
1067
1068         CDEBUG(D_INODE, "parent ino %lu, name %s\n",
1069                (*dparentp)->d_inode->i_ino, name);
1070
1071         parent_res_id.name[0] = (*dparentp)->d_inode->i_ino;
1072         parent_res_id.name[1] = (*dparentp)->d_inode->i_generation;
1073
1074         cleanup_phase = 1; /* parent dentry */
1075
1076         /* Step 2: Lookup child (without DLM lock, to get resource name) */
1077         *dchildp = ll_lookup_one_len(name, *dparentp, namelen - 1);
1078         if (IS_ERR(*dchildp)) {
1079                 rc = PTR_ERR(*dchildp);
1080                 CDEBUG(D_INODE, "child lookup error %d\n", rc);
1081                 GOTO(cleanup, rc);
1082         }
1083
1084         inode = (*dchildp)->d_inode;
1085         if (inode != NULL)
1086                 inode = igrab(inode);
1087         if (inode == NULL)
1088                 goto retry_locks;
1089
1090         child_res_id.name[0] = inode->i_ino;
1091         child_res_id.name[1] = inode->i_generation;
1092
1093         iput(inode);
1094
1095 retry_locks:
1096         cleanup_phase = 2; /* child dentry */
1097
1098         /* Step 3: Lock parent and child in resource order.  If child doesn't
1099          *         exist, we still have to lock the parent and re-lookup. */
1100         rc = enqueue_ordered_locks(obd,&parent_res_id,parent_lockh,parent_mode,
1101                                    &parent_policy,
1102                                    &child_res_id, child_lockh, child_mode,
1103                                    &child_policy);
1104         if (rc)
1105                 GOTO(cleanup, rc);
1106
1107         if (!(*dchildp)->d_inode)
1108                 cleanup_phase = 3; /* parent lock */
1109         else
1110                 cleanup_phase = 4; /* child lock */
1111
1112         /* Step 4: Re-lookup child to verify it hasn't changed since locking */
1113         rc = mds_verify_child(obd, &parent_res_id, parent_lockh, *dparentp,
1114                               parent_mode, &child_res_id, child_lockh,
1115                               dchildp, child_mode, &child_policy,
1116                               name, namelen, &parent_res_id);
1117         if (rc > 0)
1118                 goto retry_locks;
1119         if (rc < 0) {
1120                 cleanup_phase = 3;
1121                 GOTO(cleanup, rc);
1122         }
1123
1124 cleanup:
1125         if (rc) {
1126                 switch (cleanup_phase) {
1127                 case 4:
1128                         ldlm_lock_decref(child_lockh, child_mode);
1129                 case 3:
1130                         ldlm_lock_decref(parent_lockh, parent_mode);
1131                 case 2:
1132                         l_dput(*dchildp);
1133                 case 1:
1134                         l_dput(*dparentp);
1135                 default: ;
1136                 }
1137         }
1138         return rc;
1139 }
1140
1141 void mds_reconstruct_generic(struct ptlrpc_request *req)
1142 {
1143         struct mds_export_data *med = &req->rq_export->exp_mds_data;
1144
1145         mds_req_from_mcd(req, med->med_mcd);
1146 }
1147
1148 static int mds_reint_unlink(struct mds_update_record *rec, int offset,
1149                             struct ptlrpc_request *req,
1150                             struct lustre_handle *lh)
1151 {
1152         struct dentry *dparent, *dchild;
1153         struct mds_obd *mds = mds_req2mds(req);
1154         struct obd_device *obd = req->rq_export->exp_obd;
1155         struct mds_body *body = NULL;
1156         struct inode *child_inode;
1157         struct lustre_handle parent_lockh, child_lockh, child_reuse_lockh;
1158         void *handle = NULL;
1159         int rc = 0, log_unlink = 0, cleanup_phase = 0;
1160         ENTRY;
1161
1162         LASSERT(offset == 0 || offset == 2);
1163
1164         DEBUG_REQ(D_INODE, req, "parent ino "LPU64"/%u, child %s",
1165                   rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_name);
1166
1167         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1168
1169         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNLINK))
1170                 GOTO(cleanup, rc = -ENOENT);
1171
1172         rc = mds_get_parent_child_locked(obd, mds, rec->ur_fid1,
1173                                          &parent_lockh, &dparent, LCK_PW,
1174                                          MDS_INODELOCK_UPDATE,
1175                                          rec->ur_name, rec->ur_namelen,
1176                                          &child_lockh, &dchild, LCK_EX,
1177                                          MDS_INODELOCK_LOOKUP|MDS_INODELOCK_UPDATE);
1178         if (rc)
1179                 GOTO(cleanup, rc);
1180
1181         cleanup_phase = 1; /* dchild, dparent, locks */
1182
1183         child_inode = dchild->d_inode;
1184         if (child_inode == NULL) {
1185                 CDEBUG(D_INODE, "child doesn't exist (dir %lu, name %s)\n",
1186                        dparent->d_inode->i_ino, rec->ur_name);
1187                 GOTO(cleanup, rc = -ENOENT);
1188         }
1189
1190         cleanup_phase = 2; /* dchild has a lock */
1191
1192         /* Step 4: Get a lock on the ino to sync with creation WRT inode
1193          * reuse (see bug 2029). */
1194         rc = mds_lock_new_child(obd, child_inode, &child_reuse_lockh);
1195         if (rc != ELDLM_OK)
1196                 GOTO(cleanup, rc);
1197
1198         cleanup_phase = 3; /* child inum lock */
1199
1200         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_UNLINK_WRITE, dparent->d_inode->i_sb);
1201
1202         /* ldlm_reply in buf[0] if called via intent */
1203         if (offset)
1204                 offset = 1;
1205
1206         body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
1207         LASSERT(body != NULL);
1208
1209         /* If this is the last reference to this inode, get the OBD EA
1210          * data first so the client can destroy OST objects.
1211          * we only do the object removal if no open files remain.
1212          * Nobody can get at this name anymore because of the locks so
1213          * we make decisions here as to whether to remove the inode */
1214         if (S_ISREG(child_inode->i_mode) && child_inode->i_nlink == 1 &&
1215             mds_open_orphan_count(child_inode) == 0) {
1216                 mds_pack_inode2fid(&body->fid1, child_inode);
1217                 mds_pack_inode2body(body, child_inode);
1218                 mds_pack_md(obd, req->rq_repmsg, offset + 1, body,
1219                             child_inode, 1);
1220                 if (!(body->valid & OBD_MD_FLEASIZE)) {
1221                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1222                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
1223                 } else {
1224                         log_unlink = 1;
1225                 }
1226         }
1227
1228         /* We have to do these checks ourselves, in case we are making an
1229          * orphan.  The client tells us whether rmdir() or unlink() was called,
1230          * so we need to return appropriate errors (bug 72).
1231          *
1232          * We don't have to check permissions, because vfs_rename (called from
1233          * mds_open_unlink_rename) also calls may_delete. */
1234         if ((rec->ur_mode & S_IFMT) == S_IFDIR) {
1235                 if (!S_ISDIR(child_inode->i_mode))
1236                         GOTO(cleanup, rc = -ENOTDIR);
1237         } else {
1238                 if (S_ISDIR(child_inode->i_mode))
1239                         GOTO(cleanup, rc = -EISDIR);
1240         }
1241
1242         if (child_inode->i_nlink == (S_ISDIR(child_inode->i_mode) ? 2 : 1) &&
1243             mds_open_orphan_count(child_inode) > 0) {
1244                 rc = mds_open_unlink_rename(rec, obd, dparent, dchild, &handle);
1245                 cleanup_phase = 4; /* transaction */
1246                 GOTO(cleanup, rc);
1247         }
1248
1249         /* Step 4: Do the unlink: we already verified ur_mode above (bug 72) */
1250         switch (child_inode->i_mode & S_IFMT) {
1251         case S_IFDIR:
1252                 /* Drop any lingering child directories before we start our
1253                  * transaction, to avoid doing multiple inode dirty/delete
1254                  * in our compound transaction (bug 1321). */
1255                 shrink_dcache_parent(dchild);
1256                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_RMDIR,
1257                                       NULL);
1258                 if (IS_ERR(handle))
1259                         GOTO(cleanup, rc = PTR_ERR(handle));
1260                 cleanup_phase = 4; /* transaction */
1261                 rc = vfs_rmdir(dparent->d_inode, dchild);
1262                 break;
1263         case S_IFREG: {
1264                 struct lov_mds_md *lmm = lustre_msg_buf(req->rq_repmsg,
1265                                                         offset + 1, 0);
1266                 handle = fsfilt_start_log(obd, dparent->d_inode,
1267                                           FSFILT_OP_UNLINK, NULL,
1268                                           le32_to_cpu(lmm->lmm_stripe_count));
1269                 if (IS_ERR(handle))
1270                         GOTO(cleanup, rc = PTR_ERR(handle));
1271
1272                 cleanup_phase = 4; /* transaction */
1273                 rc = vfs_unlink(dparent->d_inode, dchild);
1274
1275                 if (!rc && log_unlink)
1276                         if (mds_log_op_unlink(obd, child_inode,
1277                                 lustre_msg_buf(req->rq_repmsg, offset + 1, 0),
1278                                 req->rq_repmsg->buflens[offset + 1],
1279                                 lustre_msg_buf(req->rq_repmsg, offset + 2, 0),
1280                                 req->rq_repmsg->buflens[offset + 2]) > 0)
1281                                 body->valid |= OBD_MD_FLCOOKIE;
1282                 break;
1283         }
1284         case S_IFLNK:
1285         case S_IFCHR:
1286         case S_IFBLK:
1287         case S_IFIFO:
1288         case S_IFSOCK:
1289                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK,
1290                                       NULL);
1291                 if (IS_ERR(handle))
1292                         GOTO(cleanup, rc = PTR_ERR(handle));
1293                 cleanup_phase = 4; /* transaction */
1294                 rc = vfs_unlink(dparent->d_inode, dchild);
1295                 break;
1296         default:
1297                 CERROR("bad file type %o unlinking %s\n", rec->ur_mode,
1298                        rec->ur_name);
1299                 LBUG();
1300                 GOTO(cleanup, rc = -EINVAL);
1301         }
1302
1303  cleanup:
1304         if (rc == 0) {
1305                 struct iattr iattr;
1306                 int err;
1307
1308                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
1309                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
1310                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
1311
1312                 err = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
1313                 if (err)
1314                         CERROR("error on parent setattr: rc = %d\n", err);
1315         }
1316
1317         switch(cleanup_phase) {
1318         case 4:
1319                 rc = mds_finish_transno(mds, dparent->d_inode, handle, req,
1320                                         rc, 0);
1321                 if (!rc)
1322                         (void)obd_set_info(mds->mds_osc_exp, strlen("unlinked"),
1323                                            "unlinked", 0, NULL);
1324         case 3: /* child ino-reuse lock */
1325                 if (rc && body != NULL) {
1326                         // Don't unlink the OST objects if the MDS unlink failed
1327                         body->valid = 0;
1328                 }
1329                 if (rc)
1330                         ldlm_lock_decref(&child_reuse_lockh, LCK_EX);
1331                 else
1332                         ptlrpc_save_lock(req, &child_reuse_lockh, LCK_EX);
1333         case 2: /* child lock */
1334                 ldlm_lock_decref(&child_lockh, LCK_EX);
1335         case 1: /* child and parent dentry, parent lock */
1336                 if (rc)
1337                         ldlm_lock_decref(&parent_lockh, LCK_PW);
1338                 else
1339                         ptlrpc_save_lock(req, &parent_lockh, LCK_PW);
1340                 l_dput(dchild);
1341                 l_dput(dparent);
1342         case 0:
1343                 break;
1344         default:
1345                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1346                 LBUG();
1347         }
1348         req->rq_status = rc;
1349         return 0;
1350 }
1351
1352 static int mds_reint_link(struct mds_update_record *rec, int offset,
1353                           struct ptlrpc_request *req,
1354                           struct lustre_handle *lh)
1355 {
1356         struct obd_device *obd = req->rq_export->exp_obd;
1357         struct dentry *de_src = NULL;
1358         struct dentry *de_tgt_dir = NULL;
1359         struct dentry *dchild = NULL;
1360         struct mds_obd *mds = mds_req2mds(req);
1361         struct lustre_handle *handle = NULL, tgt_dir_lockh, src_lockh;
1362         struct ldlm_res_id src_res_id = { .name = {0} };
1363         struct ldlm_res_id tgt_dir_res_id = { .name = {0} };
1364         ldlm_policy_data_t src_policy ={.l_inodebits = {MDS_INODELOCK_UPDATE}};
1365         ldlm_policy_data_t tgt_dir_policy =
1366                                        {.l_inodebits = {MDS_INODELOCK_UPDATE}};
1367
1368         int rc = 0, cleanup_phase = 0;
1369         ENTRY;
1370
1371         LASSERT(offset == 0);
1372
1373         DEBUG_REQ(D_INODE, req, "original "LPU64"/%u to "LPU64"/%u %s",
1374                   rec->ur_fid1->id, rec->ur_fid1->generation,
1375                   rec->ur_fid2->id, rec->ur_fid2->generation, rec->ur_name);
1376
1377         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1378
1379         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_LINK))
1380                 GOTO(cleanup, rc = -ENOENT);
1381
1382         /* Step 1: Lookup the source inode and target directory by FID */
1383         de_src = mds_fid2dentry(mds, rec->ur_fid1, NULL);
1384         if (IS_ERR(de_src))
1385                 GOTO(cleanup, rc = PTR_ERR(de_src));
1386
1387         cleanup_phase = 1; /* source dentry */
1388
1389         de_tgt_dir = mds_fid2dentry(mds, rec->ur_fid2, NULL);
1390         if (IS_ERR(de_tgt_dir))
1391                 GOTO(cleanup, rc = PTR_ERR(de_tgt_dir));
1392
1393         cleanup_phase = 2; /* target directory dentry */
1394
1395         CDEBUG(D_INODE, "linking %*s/%s to inode %lu\n",
1396                de_tgt_dir->d_name.len, de_tgt_dir->d_name.name, rec->ur_name,
1397                de_src->d_inode->i_ino);
1398
1399         /* Step 2: Take the two locks */
1400         src_res_id.name[0] = de_src->d_inode->i_ino;
1401         src_res_id.name[1] = de_src->d_inode->i_generation;
1402         tgt_dir_res_id.name[0] = de_tgt_dir->d_inode->i_ino;
1403         tgt_dir_res_id.name[1] = de_tgt_dir->d_inode->i_generation;
1404
1405         rc = enqueue_ordered_locks(obd, &src_res_id, &src_lockh, LCK_EX,
1406                                    &src_policy,
1407                                    &tgt_dir_res_id, &tgt_dir_lockh, LCK_EX,
1408                                    &tgt_dir_policy);
1409         if (rc)
1410                 GOTO(cleanup, rc);
1411
1412         cleanup_phase = 3; /* locks */
1413
1414         /* Step 3: Lookup the child */
1415         dchild = ll_lookup_one_len(rec->ur_name, de_tgt_dir, rec->ur_namelen-1);
1416         if (IS_ERR(dchild)) {
1417                 rc = PTR_ERR(dchild);
1418                 if (rc != -EPERM && rc != -EACCES)
1419                         CERROR("child lookup error %d\n", rc);
1420                 GOTO(cleanup, rc);
1421         }
1422
1423         cleanup_phase = 4; /* child dentry */
1424
1425         if (dchild->d_inode) {
1426                 CDEBUG(D_INODE, "child exists (dir %lu, name %s)\n",
1427                        de_tgt_dir->d_inode->i_ino, rec->ur_name);
1428                 rc = -EEXIST;
1429                 GOTO(cleanup, rc);
1430         }
1431
1432         /* Step 4: Do it. */
1433         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_src->d_inode->i_sb);
1434
1435         handle = fsfilt_start(obd, de_tgt_dir->d_inode, FSFILT_OP_LINK, NULL);
1436         if (IS_ERR(handle)) {
1437                 rc = PTR_ERR(handle);
1438                 GOTO(cleanup, rc);
1439         }
1440
1441         rc = vfs_link(de_src, de_tgt_dir->d_inode, dchild);
1442         if (rc && rc != -EPERM && rc != -EACCES)
1443                 CERROR("vfs_link error %d\n", rc);
1444 cleanup:
1445         rc = mds_finish_transno(mds, de_tgt_dir ? de_tgt_dir->d_inode : NULL,
1446                                 handle, req, rc, 0);
1447         EXIT;
1448
1449         switch (cleanup_phase) {
1450         case 4: /* child dentry */
1451                 l_dput(dchild);
1452         case 3: /* locks */
1453                 if (rc) {
1454                         ldlm_lock_decref(&src_lockh, LCK_EX);
1455                         ldlm_lock_decref(&tgt_dir_lockh, LCK_EX);
1456                 } else {
1457                         ptlrpc_save_lock(req, &src_lockh, LCK_EX);
1458                         ptlrpc_save_lock(req, &tgt_dir_lockh, LCK_EX);
1459                 }
1460         case 2: /* target dentry */
1461                 l_dput(de_tgt_dir);
1462         case 1: /* source dentry */
1463                 l_dput(de_src);
1464         case 0:
1465                 break;
1466         default:
1467                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1468                 LBUG();
1469         }
1470         req->rq_status = rc;
1471         return 0;
1472 }
1473
1474 /*
1475  * add a hard link in the PENDING directory, only used by rename()
1476  */
1477 static int mds_add_link_orphan(struct mds_update_record *rec,
1478                                struct obd_device *obd,
1479                                struct dentry *dentry)
1480 {
1481         struct mds_obd *mds = &obd->u.mds;
1482         struct inode *pending_dir = mds->mds_pending_dir->d_inode;
1483         struct dentry *pending_child;
1484         char fidname[LL_FID_NAMELEN];
1485         int fidlen = 0, rc;
1486         ENTRY;
1487
1488         LASSERT(dentry->d_inode);
1489         LASSERT(!mds_inode_is_orphan(dentry->d_inode));
1490
1491         down(&pending_dir->i_sem);
1492         fidlen = ll_fid2str(fidname, dentry->d_inode->i_ino,
1493                             dentry->d_inode->i_generation);
1494
1495         CDEBUG(D_ERROR, "pending destroy of %dx open file %s = %s\n",
1496                mds_open_orphan_count(dentry->d_inode),
1497                rec->ur_name, fidname);
1498
1499         pending_child = lookup_one_len(fidname, mds->mds_pending_dir, fidlen);
1500         if (IS_ERR(pending_child))
1501                 GOTO(out_lock, rc = PTR_ERR(pending_child));
1502
1503         if (pending_child->d_inode != NULL) {
1504                 CERROR("re-destroying orphan file %s?\n", rec->ur_name);
1505                 LASSERT(pending_child->d_inode == dentry->d_inode);
1506                 GOTO(out_dput, rc = 0);
1507         }
1508
1509         lock_kernel();
1510         rc = vfs_link(dentry, pending_dir, pending_child);
1511         unlock_kernel();
1512         if (rc)
1513                 CERROR("error addlink orphan %s to PENDING: rc = %d\n",
1514                        rec->ur_name, rc);
1515         else
1516                 mds_inode_set_orphan(dentry->d_inode);
1517 out_dput:
1518         l_dput(pending_child);
1519 out_lock:
1520         up(&pending_dir->i_sem);
1521         RETURN(rc);
1522 }
1523
1524 /* The idea here is that we need to get four locks in the end:
1525  * one on each parent directory, one on each child.  We need to take
1526  * these locks in some kind of order (to avoid deadlocks), and the order
1527  * I selected is "increasing resource number" order.  We need to look up
1528  * the children, however, before we know what the resource number(s) are.
1529  * Thus the following plan:
1530  *
1531  * 1,2. Look up the parents
1532  * 3,4. Look up the children
1533  * 5. Take locks on the parents and children, in order
1534  * 6. Verify that the children haven't changed since they were looked up
1535  *
1536  * If there was a race and the children changed since they were first looked
1537  * up, it is possible that mds_verify_child() will be able to just grab the
1538  * lock on the new child resource (if it has a higher resource than any other)
1539  * but we need to compare against not only its parent, but also against the
1540  * parent and child of the "other half" of the rename, hence maxres_{src,tgt}.
1541  *
1542  * We need the fancy igrab() on the child inodes because we aren't holding a
1543  * lock on the parent after the lookup is done, so dentry->d_inode may change
1544  * at any time, and igrab() itself doesn't like getting passed a NULL argument.
1545  */
1546 static int mds_get_parents_children_locked(struct obd_device *obd,
1547                                            struct mds_obd *mds,
1548                                            struct ll_fid *p1_fid,
1549                                            struct dentry **de_srcdirp,
1550                                            struct ll_fid *p2_fid,
1551                                            struct dentry **de_tgtdirp,
1552                                            int parent_mode,
1553                                            const char *old_name, int old_len,
1554                                            struct dentry **de_oldp,
1555                                            const char *new_name, int new_len,
1556                                            struct dentry **de_newp,
1557                                            struct lustre_handle *dlm_handles,
1558                                            int child_mode)
1559 {
1560         struct ldlm_res_id p1_res_id = { .name = {0} };
1561         struct ldlm_res_id p2_res_id = { .name = {0} };
1562         struct ldlm_res_id c1_res_id = { .name = {0} };
1563         struct ldlm_res_id c2_res_id = { .name = {0} };
1564         ldlm_policy_data_t p_policy = {.l_inodebits = {MDS_INODELOCK_UPDATE}};
1565         /* Only dentry should change, but the inode itself would be
1566            intact otherwise */
1567         ldlm_policy_data_t c1_policy = {.l_inodebits = {MDS_INODELOCK_LOOKUP}};
1568         /* If something is going to be replaced, both dentry and inode locks are
1569            needed */
1570         ldlm_policy_data_t c2_policy = {.l_inodebits = {MDS_INODELOCK_LOOKUP|
1571                                                         MDS_INODELOCK_UPDATE}};
1572         struct ldlm_res_id *maxres_src, *maxres_tgt;
1573         struct inode *inode;
1574         int rc = 0, cleanup_phase = 0;
1575         ENTRY;
1576
1577         /* Step 1: Lookup the source directory */
1578         *de_srcdirp = mds_fid2dentry(mds, p1_fid, NULL);
1579         if (IS_ERR(*de_srcdirp))
1580                 GOTO(cleanup, rc = PTR_ERR(*de_srcdirp));
1581
1582         cleanup_phase = 1; /* source directory dentry */
1583
1584         p1_res_id.name[0] = (*de_srcdirp)->d_inode->i_ino;
1585         p1_res_id.name[1] = (*de_srcdirp)->d_inode->i_generation;
1586
1587         /* Step 2: Lookup the target directory */
1588         if (memcmp(p1_fid, p2_fid, sizeof(*p1_fid)) == 0) {
1589                 *de_tgtdirp = dget(*de_srcdirp);
1590         } else {
1591                 *de_tgtdirp = mds_fid2dentry(mds, p2_fid, NULL);
1592                 if (IS_ERR(*de_tgtdirp))
1593                         GOTO(cleanup, rc = PTR_ERR(*de_tgtdirp));
1594         }
1595
1596         cleanup_phase = 2; /* target directory dentry */
1597
1598         p2_res_id.name[0] = (*de_tgtdirp)->d_inode->i_ino;
1599         p2_res_id.name[1] = (*de_tgtdirp)->d_inode->i_generation;
1600
1601         /* Step 3: Lookup the source child entry */
1602         *de_oldp = ll_lookup_one_len(old_name, *de_srcdirp, old_len - 1);
1603         if (IS_ERR(*de_oldp)) {
1604                 rc = PTR_ERR(*de_oldp);
1605                 CERROR("old child lookup error (%*s): %d\n",
1606                        old_len - 1, old_name, rc);
1607                 GOTO(cleanup, rc);
1608         }
1609
1610         cleanup_phase = 3; /* original name dentry */
1611
1612         inode = (*de_oldp)->d_inode;
1613         if (inode != NULL)
1614                 inode = igrab(inode);
1615         if (inode == NULL)
1616                 GOTO(cleanup, rc = -ENOENT);
1617
1618         c1_res_id.name[0] = inode->i_ino;
1619         c1_res_id.name[1] = inode->i_generation;
1620         iput(inode);
1621
1622         /* Step 4: Lookup the target child entry */
1623         *de_newp = ll_lookup_one_len(new_name, *de_tgtdirp, new_len - 1);
1624         if (IS_ERR(*de_newp)) {
1625                 rc = PTR_ERR(*de_newp);
1626                 CERROR("new child lookup error (%*s): %d\n",
1627                        old_len - 1, old_name, rc);
1628                 GOTO(cleanup, rc);
1629         }
1630
1631         cleanup_phase = 4; /* target dentry */
1632
1633         inode = (*de_newp)->d_inode;
1634         if (inode != NULL)
1635                 inode = igrab(inode);
1636         if (inode == NULL)
1637                 goto retry_locks;
1638
1639         c2_res_id.name[0] = inode->i_ino;
1640         c2_res_id.name[1] = inode->i_generation;
1641
1642         iput(inode);
1643
1644 retry_locks:
1645         /* Step 5: Take locks on the parents and child(ren) */
1646         maxres_src = &p1_res_id;
1647         maxres_tgt = &p2_res_id;
1648         cleanup_phase = 4; /* target dentry */
1649
1650         if (c1_res_id.name[0] != 0 && res_gt(&c1_res_id, &p1_res_id, NULL,NULL))
1651                 maxres_src = &c1_res_id;
1652         if (c2_res_id.name[0] != 0 && res_gt(&c2_res_id, &p2_res_id, NULL,NULL))
1653                 maxres_tgt = &c2_res_id;
1654
1655         rc = enqueue_4ordered_locks(obd, &p1_res_id,&dlm_handles[0],parent_mode,
1656                                     &p_policy,
1657                                     &p2_res_id, &dlm_handles[1], parent_mode,
1658                                     &p_policy,
1659                                     &c1_res_id, &dlm_handles[2], child_mode,
1660                                     &c1_policy,
1661                                     &c2_res_id, &dlm_handles[3], child_mode,
1662                                     &c2_policy);
1663         if (rc)
1664                 GOTO(cleanup, rc);
1665
1666         cleanup_phase = 6; /* parent and child(ren) locks */
1667
1668         /* Step 6a: Re-lookup source child to verify it hasn't changed */
1669         rc = mds_verify_child(obd, &p1_res_id, &dlm_handles[0], *de_srcdirp,
1670                               parent_mode, &c1_res_id, &dlm_handles[2],
1671                               de_oldp, child_mode, &c1_policy, old_name,old_len,
1672                               maxres_tgt);
1673         if (rc) {
1674                 if (c2_res_id.name[0] != 0)
1675                         ldlm_lock_decref(&dlm_handles[3], child_mode);
1676                 ldlm_lock_decref(&dlm_handles[1], parent_mode);
1677                 cleanup_phase = 4;
1678                 if (rc > 0)
1679                         goto retry_locks;
1680                 GOTO(cleanup, rc);
1681         }
1682
1683         if ((*de_oldp)->d_inode == NULL)
1684                 GOTO(cleanup, rc = -ENOENT);
1685
1686         /* Step 6b: Re-lookup target child to verify it hasn't changed */
1687         rc = mds_verify_child(obd, &p2_res_id, &dlm_handles[1], *de_tgtdirp,
1688                               parent_mode, &c2_res_id, &dlm_handles[3],
1689                               de_newp, child_mode, &c2_policy, new_name,
1690                               new_len, maxres_src);
1691         if (rc) {
1692                 ldlm_lock_decref(&dlm_handles[2], child_mode);
1693                 ldlm_lock_decref(&dlm_handles[0], parent_mode);
1694                 cleanup_phase = 4;
1695                 if (rc > 0)
1696                         goto retry_locks;
1697                 GOTO(cleanup, rc);
1698         }
1699
1700         EXIT;
1701 cleanup:
1702         if (rc) {
1703                 switch (cleanup_phase) {
1704                 case 6: /* child lock(s) */
1705                         if (c2_res_id.name[0] != 0)
1706                                 ldlm_lock_decref(&dlm_handles[3], child_mode);
1707                         if (c1_res_id.name[0] != 0)
1708                                 ldlm_lock_decref(&dlm_handles[2], child_mode);
1709                 case 5: /* parent locks */
1710                         ldlm_lock_decref(&dlm_handles[1], parent_mode);
1711                         ldlm_lock_decref(&dlm_handles[0], parent_mode);
1712                 case 4: /* target dentry */
1713                         l_dput(*de_newp);
1714                 case 3: /* source dentry */
1715                         l_dput(*de_oldp);
1716                 case 2: /* target directory dentry */
1717                         l_dput(*de_tgtdirp);
1718                 case 1: /* source directry dentry */
1719                         l_dput(*de_srcdirp);
1720                 }
1721         }
1722
1723         return rc;
1724 }
1725
1726 static int mds_reint_rename(struct mds_update_record *rec, int offset,
1727                             struct ptlrpc_request *req,
1728                             struct lustre_handle *lockh)
1729 {
1730         struct obd_device *obd = req->rq_export->exp_obd;
1731         struct dentry *de_srcdir = NULL;
1732         struct dentry *de_tgtdir = NULL;
1733         struct dentry *de_old = NULL;
1734         struct dentry *de_new = NULL;
1735         struct mds_obd *mds = mds_req2mds(req);
1736         struct lustre_handle dlm_handles[4];
1737         struct mds_body *body = NULL;
1738         int rc = 0, lock_count = 3;
1739         int cleanup_phase = 0;
1740         void *handle = NULL;
1741         ENTRY;
1742
1743         LASSERT(offset == 0);
1744
1745         DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u %s to "LPU64"/%u %s",
1746                   rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_name,
1747                   rec->ur_fid2->id, rec->ur_fid2->generation, rec->ur_tgt);
1748
1749         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1750
1751         rc = mds_get_parents_children_locked(obd, mds, rec->ur_fid1, &de_srcdir,
1752                                              rec->ur_fid2, &de_tgtdir, LCK_PW,
1753                                              rec->ur_name, rec->ur_namelen,
1754                                              &de_old, rec->ur_tgt,
1755                                              rec->ur_tgtlen, &de_new,
1756                                              dlm_handles, LCK_EX);
1757         if (rc)
1758                 GOTO(cleanup, rc);
1759
1760         cleanup_phase = 1; /* parent(s), children, locks */
1761
1762         if (de_new->d_inode)
1763                 lock_count = 4;
1764
1765         /* sanity check for src inode */
1766         if (de_old->d_inode->i_ino == de_srcdir->d_inode->i_ino ||
1767             de_old->d_inode->i_ino == de_tgtdir->d_inode->i_ino)
1768                 GOTO(cleanup, rc = -EINVAL);
1769
1770         /* sanity check for dest inode */
1771         if (de_new->d_inode &&
1772             (de_new->d_inode->i_ino == de_srcdir->d_inode->i_ino ||
1773              de_new->d_inode->i_ino == de_tgtdir->d_inode->i_ino))
1774                 GOTO(cleanup, rc = -EINVAL);
1775
1776         if (de_old->d_inode == de_new->d_inode) {
1777                 GOTO(cleanup, rc = 0);
1778         }
1779
1780         /* if we are about to remove the target at first, pass the EA of
1781          * that inode to client to perform and cleanup on OST */
1782         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
1783         LASSERT(body != NULL);
1784
1785         if (de_new->d_inode &&
1786             S_ISREG(de_new->d_inode->i_mode) &&
1787             de_new->d_inode->i_nlink == 1 &&
1788             mds_open_orphan_count(de_new->d_inode) == 0) {
1789                 mds_pack_inode2fid(&body->fid1, de_new->d_inode);
1790                 mds_pack_inode2body(body, de_new->d_inode);
1791                 mds_pack_md(obd, req->rq_repmsg, 1, body, de_new->d_inode, 1);
1792                 if (!(body->valid & OBD_MD_FLEASIZE)) {
1793                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1794                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
1795                 } else {
1796                         /* XXX need log unlink? */
1797                 }
1798         }
1799
1800         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_RENAME_WRITE,
1801                        de_srcdir->d_inode->i_sb);
1802
1803         handle = fsfilt_start(obd, de_tgtdir->d_inode, FSFILT_OP_RENAME, NULL);
1804         if (IS_ERR(handle))
1805                 GOTO(cleanup, rc = PTR_ERR(handle));
1806
1807         /* FIXME need adjust the journal block count? */
1808         /* if the target should be moved to PENDING, we at first increase the
1809          * link and later vfs_rename() will decrease the link count again */
1810         if (de_new->d_inode &&
1811             S_ISREG(de_new->d_inode->i_mode) &&
1812             de_new->d_inode->i_nlink == 1 &&
1813             mds_open_orphan_count(de_new->d_inode) > 0) {
1814                 rc = mds_add_link_orphan(rec, obd, de_new);
1815                 if (rc)
1816                         GOTO(cleanup, rc);
1817         }
1818
1819         lock_kernel();
1820         de_old->d_fsdata = req;
1821         de_new->d_fsdata = req;
1822         rc = vfs_rename(de_srcdir->d_inode, de_old, de_tgtdir->d_inode, de_new);
1823         unlock_kernel();
1824
1825         GOTO(cleanup, rc);
1826 cleanup:
1827         rc = mds_finish_transno(mds, de_tgtdir ? de_tgtdir->d_inode : NULL,
1828                                 handle, req, rc, 0);
1829         switch (cleanup_phase) {
1830         case 1:
1831                 if (rc) {
1832                         if (lock_count == 4)
1833                                 ldlm_lock_decref(&(dlm_handles[3]), LCK_EX);
1834                         ldlm_lock_decref(&(dlm_handles[2]), LCK_EX);
1835                         ldlm_lock_decref(&(dlm_handles[1]), LCK_PW);
1836                         ldlm_lock_decref(&(dlm_handles[0]), LCK_PW);
1837                 } else {
1838                         if (lock_count == 4)
1839                                 ptlrpc_save_lock(req,&(dlm_handles[3]), LCK_EX);
1840                         ptlrpc_save_lock(req, &(dlm_handles[2]), LCK_EX);
1841                         ptlrpc_save_lock(req, &(dlm_handles[1]), LCK_PW);
1842                         ptlrpc_save_lock(req, &(dlm_handles[0]), LCK_PW);
1843                 }
1844                 l_dput(de_new);
1845                 l_dput(de_old);
1846                 l_dput(de_tgtdir);
1847                 l_dput(de_srcdir);
1848         case 0:
1849                 break;
1850         default:
1851                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1852                 LBUG();
1853         }
1854         req->rq_status = rc;
1855         return 0;
1856 }
1857
1858 typedef int (*mds_reinter)(struct mds_update_record *, int offset,
1859                            struct ptlrpc_request *, struct lustre_handle *);
1860
1861 static mds_reinter reinters[REINT_MAX + 1] = {
1862         [REINT_SETATTR] mds_reint_setattr,
1863         [REINT_CREATE] mds_reint_create,
1864         [REINT_LINK] mds_reint_link,
1865         [REINT_UNLINK] mds_reint_unlink,
1866         [REINT_RENAME] mds_reint_rename,
1867         [REINT_OPEN] mds_open
1868 };
1869
1870 int mds_reint_rec(struct mds_update_record *rec, int offset,
1871                   struct ptlrpc_request *req, struct lustre_handle *lockh)
1872 {
1873         struct obd_device *obd = req->rq_export->exp_obd;
1874         struct obd_run_ctxt saved;
1875         int rc;
1876         ENTRY;
1877
1878         /* checked by unpacker */
1879         LASSERT(rec->ur_opcode <= REINT_MAX &&
1880                 reinters[rec->ur_opcode] != NULL);
1881
1882         push_ctxt(&saved, &obd->obd_ctxt, &rec->ur_uc);
1883         rc = reinters[rec->ur_opcode] (rec, offset, req, lockh);
1884         pop_ctxt(&saved, &obd->obd_ctxt, &rec->ur_uc);
1885
1886         RETURN(rc);
1887 }