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_log.h>
  42 #include <linux/lustre_fsfilt.h>
  43
  44 #include "mds_internal.h"
  45
  46 void mds_commit_cb(struct obd_device *obd, __u64 transno, void *data,
  47                    int error)
  48 {
  49         obd_transno_commit_cb(obd, transno, error);
  50 }
  51
  52 struct mds_logcancel_data {
  53         struct lov_mds_md      *mlcd_lmm;
  54         int                     mlcd_size;
  55         int                     mlcd_cookielen;
  56         int                     mlcd_eadatalen;
  57         struct llog_cookie      mlcd_cookies[0];
  58 };
  59
  60
  61 static void mds_cancel_cookies_cb(struct obd_device *obd, __u64 transno,
  62                                   void *cb_data, int error)
  63 {
  64         struct mds_logcancel_data *mlcd = cb_data;
  65         struct lov_stripe_md *lsm = NULL;
  66         struct llog_ctxt *ctxt;
  67         int rc;
  68
  69         obd_transno_commit_cb(obd, transno, error);
  70
  71         CDEBUG(D_HA, "cancelling %d cookies\n",
  72                (int)(mlcd->mlcd_cookielen / sizeof(*mlcd->mlcd_cookies)));
  73
  74         rc = obd_unpackmd(obd->u.mds.mds_osc_exp, &lsm, mlcd->mlcd_lmm,
  75                           mlcd->mlcd_eadatalen);
  76         if (rc < 0) {
  77                 CERROR("bad LSM cancelling %d log cookies: rc %d\n",
  78                        (int)(mlcd->mlcd_cookielen/sizeof(*mlcd->mlcd_cookies)),
  79                        rc);
  80         } else {
  81                 ///* XXX 0 normally, SENDNOW for debug */);
  82                 ctxt = llog_get_context(&obd->obd_llogs,
  83                                         mlcd->mlcd_cookies[0].lgc_subsys + 1);
  84                 rc = llog_cancel(ctxt, mlcd->mlcd_cookielen /
  85                                  sizeof(*mlcd->mlcd_cookies),
  86                                  mlcd->mlcd_cookies, OBD_LLOG_FL_SENDNOW, lsm);
  87                 if (rc)
  88                         CERROR("error cancelling %d log cookies: rc %d\n",
  89                                (int)(mlcd->mlcd_cookielen /
  90                                      sizeof(*mlcd->mlcd_cookies)), rc);
  91         }
  92
  93         OBD_FREE(mlcd, mlcd->mlcd_size);
  94 }
  95
  96 /* Assumes caller has already pushed us into the kernel context. */
  97 int mds_finish_transno(struct mds_obd *mds, struct inode *inode, void *handle,
  98                        struct ptlrpc_request *req, int rc, __u32 op_data)
  99 {
 100         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 101         struct mds_client_data *mcd = med->med_mcd;
 102         struct obd_device *obd = req->rq_export->exp_obd;
 103         int err;
 104         __u64 transno;
 105         loff_t off;
 106         int log_pri = D_HA;
 107         ENTRY;
 108
 109         /* if the export has already been failed, we have no last_rcvd slot */
 110         if (req->rq_export->exp_failed) {
 111                 CERROR("committing transaction for disconnected client\n");
 112                 if (handle)
 113                         GOTO(commit, rc);
 114                 RETURN(rc);
 115         }
 116
 117         if (IS_ERR(handle))
 118                 RETURN(rc);
 119
 120         if (handle == NULL) {
 121                 /* if we're starting our own xaction, use our own inode */
 122                 inode = mds->mds_rcvd_filp->f_dentry->d_inode;
 123                 handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
 124                 if (IS_ERR(handle)) {
 125                         CERROR("fsfilt_start: %ld\n", PTR_ERR(handle));
 126                         RETURN(PTR_ERR(handle));
 127                 }
 128         }
 129
 130         off = med->med_off;
 131
 132         transno = req->rq_reqmsg->transno;
 133         if (rc != 0) {
 134                 LASSERT(transno == 0);
 135         } else if (transno == 0) {
 136                 spin_lock(&mds->mds_transno_lock);
 137                 transno = ++mds->mds_last_transno;
 138                 spin_unlock(&mds->mds_transno_lock);
 139         } else {
 140                 spin_lock(&mds->mds_transno_lock);
 141                 if (transno > mds->mds_last_transno)
 142                         mds->mds_last_transno = transno;
 143                 spin_unlock(&mds->mds_transno_lock);
 144         }
 145         req->rq_repmsg->transno = req->rq_transno = transno;
 146         mcd->mcd_last_transno = cpu_to_le64(transno);
 147         mcd->mcd_last_xid = cpu_to_le64(req->rq_xid);
 148         mcd->mcd_last_result = cpu_to_le32(rc);
 149         mcd->mcd_last_data = cpu_to_le32(op_data);
 150
 151
 152         fsfilt_add_journal_cb(req->rq_export->exp_obd, mds->mds_sb,
 153                               transno, handle, mds_commit_cb, NULL);
 154
 155         err = fsfilt_write_record(obd, mds->mds_rcvd_filp, mcd, sizeof(*mcd),
 156                                   &off, 0);
 157
 158         if (err) {
 159                 log_pri = D_ERROR;
 160                 if (rc == 0)
 161                         rc = err;
 162         }
 163
 164         DEBUG_REQ(log_pri, req,
 165                   "wrote trans #"LPU64" client %s at idx %u: err = %d",
 166                   transno, mcd->mcd_uuid, med->med_idx, err);
 167
 168         err = mds_lov_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 commit:
 177         err = fsfilt_commit(obd, mds->mds_sb, inode, handle, 0);
 178         if (err) {
 179                 CERROR("error committing transaction: %d\n", err);
 180                 if (!rc)
 181                         rc = err;
 182         }
 183
 184         RETURN(rc);
 185 }
 186
 187 /* this gives the same functionality as the code between
 188  * sys_chmod and inode_setattr
 189  * chown_common and inode_setattr
 190  * utimes and inode_setattr
 191  */
 192 int mds_fix_attr(struct inode *inode, struct mds_update_record *rec)
 193 {
 194         time_t now = LTIME_S(CURRENT_TIME);
 195         struct iattr *attr = &rec->ur_iattr;
 196         unsigned int ia_valid = attr->ia_valid;
 197         int error;
 198         ENTRY;
 199
 200         /* only fix up attrs if the client VFS didn't already */
 201         if (!(ia_valid & ATTR_RAW))
 202                 RETURN(0);
 203
 204         if (!(ia_valid & ATTR_CTIME_SET))
 205                 LTIME_S(attr->ia_ctime) = now;
 206         if (!(ia_valid & ATTR_ATIME_SET))
 207                 LTIME_S(attr->ia_atime) = now;
 208         if (!(ia_valid & ATTR_MTIME_SET))
 209                 LTIME_S(attr->ia_mtime) = now;
 210
 211         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 212                 RETURN(-EPERM);
 213
 214         /* times */
 215         if ((ia_valid & (ATTR_MTIME|ATTR_ATIME)) == (ATTR_MTIME|ATTR_ATIME)) {
 216                 if (rec->_ur_fsuid != inode->i_uid &&
 217                     (error = ll_permission(inode, MAY_WRITE, NULL)) != 0)
 218                         RETURN(error);
 219         }
 220
 221         if (ia_valid & ATTR_SIZE) {
 222                 if ((error = ll_permission(inode, MAY_WRITE, NULL)) != 0)
 223                         RETURN(error);
 224         }
 225
 226         if (ia_valid & ATTR_UID) {
 227                 /* chown */
 228                 error = -EPERM;
 229                 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 230                         RETURN(-EPERM);
 231                 if (attr->ia_uid == (uid_t) -1)
 232                         attr->ia_uid = inode->i_uid;
 233                 if (attr->ia_gid == (gid_t) -1)
 234                         attr->ia_gid = inode->i_gid;
 235                 attr->ia_mode = inode->i_mode;
 236                 /*
 237                  * If the user or group of a non-directory has been
 238                  * changed by a non-root user, remove the setuid bit.
 239                  * 19981026 David C Niemi <niemi@tux.org>
 240                  *
 241                  * Changed this to apply to all users, including root,
 242                  * to avoid some races. This is the behavior we had in
 243                  * 2.0. The check for non-root was definitely wrong
 244                  * for 2.2 anyway, as it should have been using
 245                  * CAP_FSETID rather than fsuid -- 19990830 SD.
 246                  */
 247                 if ((inode->i_mode & S_ISUID) == S_ISUID &&
 248                     !S_ISDIR(inode->i_mode)) {
 249                         attr->ia_mode &= ~S_ISUID;
 250                         attr->ia_valid |= ATTR_MODE;
 251                 }
 252                 /*
 253                  * Likewise, if the user or group of a non-directory
 254                  * has been changed by a non-root user, remove the
 255                  * setgid bit UNLESS there is no group execute bit
 256                  * (this would be a file marked for mandatory
 257                  * locking).  19981026 David C Niemi <niemi@tux.org>
 258                  *
 259                  * Removed the fsuid check (see the comment above) --
 260                  * 19990830 SD.
 261                  */
 262                 if (((inode->i_mode & (S_ISGID | S_IXGRP)) ==
 263                      (S_ISGID | S_IXGRP)) && !S_ISDIR(inode->i_mode)) {
 264                         attr->ia_mode &= ~S_ISGID;
 265                         attr->ia_valid |= ATTR_MODE;
 266                 }
 267         } else if (ia_valid & ATTR_MODE) {
 268                 int mode = attr->ia_mode;
 269                 /* chmod */
 270                 if (attr->ia_mode == (mode_t) -1)
 271                         attr->ia_mode = inode->i_mode;
 272                 attr->ia_mode =
 273                         (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
 274         }
 275         RETURN(0);
 276 }
 277
 278 void mds_steal_ack_locks(struct ptlrpc_request *req)
 279 {
 280         struct obd_export         *exp = req->rq_export;
 281         struct list_head          *tmp;
 282         struct ptlrpc_reply_state *oldrep;
 283         struct ptlrpc_service     *svc;
 284         unsigned long              flags;
 285         char                       str[PTL_NALFMT_SIZE];
 286         int                        i;
 287
 288         /* CAVEAT EMPTOR: spinlock order */
 289         spin_lock_irqsave (&exp->exp_lock, flags);
 290         list_for_each (tmp, &exp->exp_outstanding_replies) {
 291                 oldrep = list_entry(tmp, struct ptlrpc_reply_state,rs_exp_list);
 292
 293                 if (oldrep->rs_xid != req->rq_xid)
 294                         continue;
 295
 296                 if (oldrep->rs_msg.opc != req->rq_reqmsg->opc)
 297                         CERROR ("Resent req xid "LPX64" has mismatched opc: "
 298                                 "new %d old %d\n", req->rq_xid,
 299                                 req->rq_reqmsg->opc, oldrep->rs_msg.opc);
 300
 301                 svc = oldrep->rs_srv_ni->sni_service;
 302                 spin_lock (&svc->srv_lock);
 303
 304                 list_del_init (&oldrep->rs_exp_list);
 305
 306                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
 307                       " o%d NID %s\n",
 308                       oldrep->rs_nlocks, oldrep,
 309                       oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_msg.opc,
 310                       ptlrpc_peernid2str(&exp->exp_connection->c_peer, str));
 311
 312                 for (i = 0; i < oldrep->rs_nlocks; i++)
 313                         ptlrpc_save_lock(req,
 314                                          &oldrep->rs_locks[i],
 315                                          oldrep->rs_modes[i]);
 316                 oldrep->rs_nlocks = 0;
 317
 318                 DEBUG_REQ(D_HA, req, "stole locks for");
 319                 ptlrpc_schedule_difficult_reply (oldrep);
 320
 321                 spin_unlock (&svc->srv_lock);
 322                 spin_unlock_irqrestore (&exp->exp_lock, flags);
 323                 return;
 324         }
 325         spin_unlock_irqrestore (&exp->exp_lock, flags);
 326 }
 327
 328 void mds_req_from_mcd(struct ptlrpc_request *req, struct mds_client_data *mcd)
 329 {
 330         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
 331                   mcd->mcd_last_transno, mcd->mcd_last_result);
 332         req->rq_repmsg->transno = req->rq_transno = mcd->mcd_last_transno;
 333         req->rq_repmsg->status = req->rq_status = mcd->mcd_last_result;
 334
 335         mds_steal_ack_locks(req);
 336 }
 337
 338 static void reconstruct_reint_setattr(struct mds_update_record *rec,
 339                                       int offset, struct ptlrpc_request *req)
 340 {
 341         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 342         struct mds_obd *obd = &req->rq_export->exp_obd->u.mds;
 343         struct dentry *de;
 344         struct mds_body *body;
 345
 346         mds_req_from_mcd(req, med->med_mcd);
 347
 348         de = mds_fid2dentry(obd, rec->ur_fid1, NULL);
 349         if (IS_ERR(de)) {
 350                 LASSERT(PTR_ERR(de) == req->rq_status);
 351                 return;
 352         }
 353
 354         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 355         mds_pack_inode2fid(req2obd(req), &body->fid1, de->d_inode);
 356         mds_pack_inode2body(req2obd(req), body, de->d_inode);
 357
 358         /* Don't return OST-specific attributes if we didn't just set them */
 359         if (rec->ur_iattr.ia_valid & ATTR_SIZE)
 360                 body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 361         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET))
 362                 body->valid |= OBD_MD_FLMTIME;
 363         if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET))
 364                 body->valid |= OBD_MD_FLATIME;
 365
 366         l_dput(de);
 367 }
 368
 369 /* In the raw-setattr case, we lock the child inode.
 370  * In the write-back case or if being called from open, the client holds a lock
 371  * already.
 372  *
 373  * We use the ATTR_FROM_OPEN flag to tell these cases apart. */
 374 static int mds_reint_setattr(struct mds_update_record *rec, int offset,
 375                              struct ptlrpc_request *req,
 376                              struct lustre_handle *lh)
 377 {
 378         struct mds_obd *mds = mds_req2mds(req);
 379         struct obd_device *obd = req->rq_export->exp_obd;
 380         struct mds_body *body;
 381         struct dentry *de;
 382         struct inode *inode = NULL;
 383         struct lustre_handle lockh[2] = {{0}, {0}};
 384         int parent_mode;
 385         void *handle = NULL;
 386         struct mds_logcancel_data *mlcd = NULL;
 387         int rc = 0, cleanup_phase = 0, err, locked = 0;
 388         ENTRY;
 389
 390         LASSERT(offset == 0);
 391
 392         DEBUG_REQ(D_INODE, req, "setattr "LPU64"/%u %x", rec->ur_fid1->id,
 393                   rec->ur_fid1->generation, rec->ur_iattr.ia_valid);
 394
 395         MDS_CHECK_RESENT(req, reconstruct_reint_setattr(rec, offset, req));
 396
 397         if (rec->ur_iattr.ia_valid & ATTR_FROM_OPEN) {
 398                 de = mds_fid2dentry(mds, rec->ur_fid1, NULL);
 399                 if (IS_ERR(de))
 400                         GOTO(cleanup, rc = PTR_ERR(de));
 401         } else {
 402                 __u64 lockpart = MDS_INODELOCK_UPDATE;
 403                 if (rec->ur_iattr.ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID) )
 404                         lockpart |= MDS_INODELOCK_LOOKUP;
 405                 de = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL, LCK_PW,
 406                                            lockh, &parent_mode, NULL, 0, lockpart);
 407                 if (IS_ERR(de))
 408                         GOTO(cleanup, rc = PTR_ERR(de));
 409                 locked = 1;
 410         }
 411
 412         cleanup_phase = 1;
 413
 414         inode = de->d_inode;
 415         LASSERT(inode);
 416         if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 417             rec->ur_eadata != NULL)
 418                 down(&inode->i_sem);
 419
 420         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_SETATTR_WRITE, inode->i_sb);
 421
 422         handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
 423         if (IS_ERR(handle))
 424                 GOTO(cleanup, rc = PTR_ERR(handle));
 425
 426         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_CTIME))
 427                 CDEBUG(D_INODE, "setting mtime %lu, ctime %lu\n",
 428                        LTIME_S(rec->ur_iattr.ia_mtime),
 429                        LTIME_S(rec->ur_iattr.ia_ctime));
 430         rc = mds_fix_attr(inode, rec);
 431         if (rc)
 432                 GOTO(cleanup, rc);
 433
 434         if (rec->ur_iattr.ia_valid & ATTR_ATTR_FLAG)    /* ioctl */
 435                 rc = fsfilt_iocontrol(obd, inode, NULL, EXT3_IOC_SETFLAGS,
 436                                       (long)&rec->ur_iattr.ia_attr_flags);
 437         else                                            /* setattr */
 438                 rc = fsfilt_setattr(obd, de, handle, &rec->ur_iattr, 0);
 439
 440         if (rc == 0 && (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 441             rec->ur_eadata != NULL) {
 442                 struct lov_stripe_md *lsm = NULL;
 443
 444                 rc = ll_permission(inode, MAY_WRITE, NULL);
 445                 if (rc < 0)
 446                         GOTO(cleanup, rc);
 447
 448                 rc = obd_iocontrol(OBD_IOC_LOV_SETSTRIPE,
 449                                    mds->mds_osc_exp, 0, &lsm, rec->ur_eadata);
 450                 if (rc)
 451                         GOTO(cleanup, rc);
 452
 453                 obd_free_memmd(mds->mds_osc_exp, &lsm);
 454
 455                 rc = fsfilt_set_md(obd, inode, handle, rec->ur_eadata,
 456                                    rec->ur_eadatalen);
 457                 if (rc)
 458                         GOTO(cleanup, rc);
 459         }
 460
 461         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 462         mds_pack_inode2fid(obd, &body->fid1, inode);
 463         mds_pack_inode2body(obd, body, inode);
 464
 465         /* Don't return OST-specific attributes if we didn't just set them */
 466         if (rec->ur_iattr.ia_valid & ATTR_SIZE)
 467                 body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 468         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET))
 469                 body->valid |= OBD_MD_FLMTIME;
 470         if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET))
 471                 body->valid |= OBD_MD_FLATIME;
 472
 473         if (rc == 0 && rec->ur_cookielen && !IS_ERR(mds->mds_osc_obd)) {
 474                 OBD_ALLOC(mlcd, sizeof(*mlcd) + rec->ur_cookielen +
 475                           rec->ur_eadatalen);
 476                 if (mlcd) {
 477                         mlcd->mlcd_size = sizeof(*mlcd) + rec->ur_cookielen +
 478                                 rec->ur_eadatalen;
 479                         mlcd->mlcd_eadatalen = rec->ur_eadatalen;
 480                         mlcd->mlcd_cookielen = rec->ur_cookielen;
 481                         mlcd->mlcd_lmm = (void *)&mlcd->mlcd_cookies +
 482                                 mlcd->mlcd_cookielen;
 483                         memcpy(&mlcd->mlcd_cookies, rec->ur_logcookies,
 484                                mlcd->mlcd_cookielen);
 485                         memcpy(mlcd->mlcd_lmm, rec->ur_eadata,
 486                                mlcd->mlcd_eadatalen);
 487                 } else {
 488                         CERROR("unable to allocate log cancel data\n");
 489                 }
 490         }
 491         EXIT;
 492  cleanup:
 493         if (mlcd != NULL)
 494                 fsfilt_add_journal_cb(req->rq_export->exp_obd, mds->mds_sb, 0,
 495                                       handle, mds_cancel_cookies_cb, mlcd);
 496         err = mds_finish_transno(mds, inode, handle, req, rc, 0);
 497         switch (cleanup_phase) {
 498         case 1:
 499                 if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 500                     rec->ur_eadata != NULL)
 501                         up(&inode->i_sem);
 502                 l_dput(de);
 503                 if (locked) {
 504 #ifdef S_PDIROPS
 505                         if (lockh[1].cookie != 0)
 506                                 ldlm_lock_decref(lockh + 1, parent_mode);
 507 #endif
 508                         if (rc) {
 509                                 ldlm_lock_decref(lockh, LCK_PW);
 510                         } else {
 511                                 ptlrpc_save_lock (req, lockh, LCK_PW);
 512                         }
 513                 }
 514         case 0:
 515                 break;
 516         default:
 517                 LBUG();
 518         }
 519         if (err && !rc)
 520                 rc = err;
 521
 522         req->rq_status = rc;
 523         return 0;
 524 }
 525
 526 static void reconstruct_reint_create(struct mds_update_record *rec, int offset,
 527                                      struct ptlrpc_request *req)
 528 {
 529         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 530         struct mds_obd *obd = &req->rq_export->exp_obd->u.mds;
 531         struct dentry *parent, *child;
 532         struct mds_body *body;
 533
 534         mds_req_from_mcd(req, med->med_mcd);
 535
 536         if (req->rq_status)
 537                 return;
 538
 539         parent = mds_fid2dentry(obd, rec->ur_fid1, NULL);
 540         LASSERT(!IS_ERR(parent));
 541         child = ll_lookup_one_len(rec->ur_name, parent, rec->ur_namelen - 1);
 542         LASSERT(!IS_ERR(child));
 543         body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
 544         mds_pack_inode2fid(req2obd(req), &body->fid1, child->d_inode);
 545         mds_pack_inode2body(req2obd(req), body, child->d_inode);
 546         l_dput(parent);
 547         l_dput(child);
 548 }
 549
 550 static int mds_reint_create(struct mds_update_record *rec, int offset,
 551                             struct ptlrpc_request *req,
 552                             struct lustre_handle *lh)
 553 {
 554         struct dentry *dparent = NULL;
 555         struct mds_obd *mds = mds_req2mds(req);
 556         struct obd_device *obd = req->rq_export->exp_obd;
 557         struct dentry *dchild = NULL;
 558         struct inode *dir = NULL;
 559         void *handle = NULL;
 560         struct lustre_handle lockh[2] = {{0}, {0}};
 561         int parent_mode;
 562         int rc = 0, err, type = rec->ur_mode & S_IFMT, cleanup_phase = 0;
 563         int created = 0;
 564         struct dentry_params dp;
 565         struct mea *mea = NULL;
 566         int mea_size;
 567         ENTRY;
 568
 569         LASSERT(offset == 0);
 570         LASSERT(!strcmp(req->rq_export->exp_obd->obd_type->typ_name, LUSTRE_MDS_NAME));
 571
 572         DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u name %s mode %o",
 573                   rec->ur_fid1->id, rec->ur_fid1->generation,
 574                   rec->ur_name, rec->ur_mode);
 575
 576         MDS_CHECK_RESENT(req, reconstruct_reint_create(rec, offset, req));
 577
 578         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_CREATE))
 579                 GOTO(cleanup, rc = -ESTALE);
 580
 581         dparent = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL, LCK_PW, lockh,
 582                                         &parent_mode, rec->ur_name,
 583                                         rec->ur_namelen - 1, MDS_INODELOCK_UPDATE);
 584         if (IS_ERR(dparent)) {
 585                 rc = PTR_ERR(dparent);
 586                 CERROR("parent lookup error %d\n", rc);
 587                 GOTO(cleanup, rc);
 588         }
 589         cleanup_phase = 1; /* locked parent dentry */
 590         dir = dparent->d_inode;
 591         LASSERT(dir);
 592
 593         ldlm_lock_dump_handle(D_OTHER, lockh);
 594
 595         /* try to retrieve MEA data for this dir */
 596         rc = mds_get_lmv_attr(obd, dparent->d_inode, &mea, &mea_size);
 597         if (rc)
 598                 GOTO(cleanup, rc);
 599
 600         if (mea != NULL) {
 601                 /* dir is already splitted, check is requested filename
 602                  * should live at this MDS or at another one */
 603                 int i;
 604                 i = mea_name2idx(mea, rec->ur_name, rec->ur_namelen - 1);
 605                 if (mea->mea_master != i) {
 606                         CERROR("inapropriate MDS(%d) for %s. should be %d\n",
 607                                 mea->mea_master, rec->ur_name, i);
 608                         GOTO(cleanup, rc = -ERESTART);
 609                 }
 610         }
 611
 612         dchild = ll_lookup_one_len(rec->ur_name, dparent, rec->ur_namelen - 1);
 613         if (IS_ERR(dchild)) {
 614                 rc = PTR_ERR(dchild);
 615                 CERROR("child lookup error %d\n", rc);
 616                 GOTO(cleanup, rc);
 617         }
 618
 619         cleanup_phase = 2; /* child dentry */
 620
 621         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_CREATE_WRITE, dir->i_sb);
 622
 623         if (type == S_IFREG || type == S_IFDIR) {
 624                 if ((rc = mds_try_to_split_dir(obd, dparent, &mea, 0))) {
 625                         if (rc > 0) {
 626                                 /* dir got splitted */
 627                                 GOTO(cleanup, rc = -ERESTART);
 628                         } else {
 629                                 /* error happened during spitting */
 630                                 GOTO(cleanup, rc);
 631                         }
 632                 }
 633         }
 634
 635         if (dir->i_mode & S_ISGID) {
 636                 if (S_ISDIR(rec->ur_mode))
 637                         rec->ur_mode |= S_ISGID;
 638         }
 639
 640         dchild->d_fsdata = (void *)&dp;
 641         dp.p_inum = (unsigned long)rec->ur_fid2->id;
 642         dp.p_ptr = req;
 643
 644         switch (type) {
 645         case S_IFREG:{
 646                 handle = fsfilt_start(obd, dir, FSFILT_OP_CREATE, NULL);
 647                 if (IS_ERR(handle))
 648                         GOTO(cleanup, rc = PTR_ERR(handle));
 649                 rc = ll_vfs_create(dir, dchild, rec->ur_mode, NULL);
 650                 EXIT;
 651                 break;
 652         }
 653         case S_IFDIR:{
 654                 int nstripes = 0;
 655                 int i;
 656
 657                 /* as Peter asked, mkdir() should distribute new directories
 658                  * over the whole cluster in order to distribute namespace
 659                  * processing load. first, we calculate which MDS to use to
 660                  * put new directory's inode in */
 661                 i = mds_choose_mdsnum(obd, rec->ur_name, rec->ur_namelen - 1,
 662                                       rec->ur_flags);
 663                 if (i == mds->mds_num) {
 664                         /* inode will be created locally */
 665
 666                         handle = fsfilt_start(obd, dir, FSFILT_OP_MKDIR, NULL);
 667                         if (IS_ERR(handle))
 668                                 GOTO(cleanup, rc = PTR_ERR(handle));
 669
 670                         rc = vfs_mkdir(dir, dchild, rec->ur_mode);
 671
 672                         if (rec->ur_eadata)
 673                                 nstripes = *(u16 *)rec->ur_eadata;
 674
 675                         if (rc == 0 && nstripes) {
 676                                 /* FIXME: error handling here */
 677                                 mds_try_to_split_dir(obd, dchild,
 678                                                         NULL, nstripes);
 679                         }
 680                 } else if (!DENTRY_VALID(dchild)) {
 681                         /* inode will be created on another MDS */
 682                         struct obdo *oa = NULL;
 683                         struct mds_body *body;
 684
 685                         /* first, create that inode */
 686                         oa = obdo_alloc();
 687                         LASSERT(oa != NULL);
 688                         oa->o_mds = i;
 689                         obdo_from_inode(oa, dir, OBD_MD_FLTYPE | OBD_MD_FLATIME |
 690                                         OBD_MD_FLMTIME | OBD_MD_FLCTIME |
 691                                         OBD_MD_FLUID | OBD_MD_FLGID);
 692                         oa->o_mode = dir->i_mode;
 693                         CDEBUG(D_OTHER, "%s: create dir on MDS %u\n",
 694                                         obd->obd_name, i);
 695                         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
 696                                 CWARN("%s: replay dir creation %*s -> %u/%u\n",
 697                                       obd->obd_name, rec->ur_namelen - 1,
 698                                       rec->ur_name, (unsigned) rec->ur_fid2->id,
 699                                       (unsigned) rec->ur_fid2->generation);
 700                                 oa->o_id = rec->ur_fid2->id;
 701                                 oa->o_generation = rec->ur_fid2->generation;
 702                                 oa->o_flags |= OBD_FL_RECREATE_OBJS;
 703                         }
 704
 705                         rc = obd_create(mds->mds_lmv_exp, oa, NULL, NULL);
 706                         if (rc) {
 707                                 obdo_free(oa);
 708                                 GOTO(cleanup, rc);
 709                         }
 710
 711                         /* now, add new dir entry for it */
 712                         handle = fsfilt_start(obd, dir, FSFILT_OP_MKDIR, NULL);
 713                         if (IS_ERR(handle)) {
 714                                 obdo_free(oa);
 715                                 GOTO(cleanup, rc = PTR_ERR(handle));
 716                         }
 717                         rc = fsfilt_add_dir_entry(obd, dparent, rec->ur_name,
 718                                                   rec->ur_namelen - 1,
 719                                                   oa->o_id, oa->o_generation,
 720                                                   i);
 721                         LASSERT(rc == 0);
 722
 723                         /* fill reply */
 724                         body = lustre_msg_buf(req->rq_repmsg,
 725                                               offset, sizeof (*body));
 726                         body->valid |= OBD_MD_FLID | OBD_MD_MDS;
 727                         body->fid1.id = oa->o_id;
 728                         body->fid1.mds = i;
 729                         body->fid1.generation = oa->o_generation;
 730                         obdo_free(oa);
 731                 } else {
 732                         /* requested name exists in the directory */
 733                         rc = -EEXIST;
 734                 }
 735                 EXIT;
 736                 break;
 737         }
 738         case S_IFLNK:{
 739                 handle = fsfilt_start(obd, dir, FSFILT_OP_SYMLINK, NULL);
 740                 if (IS_ERR(handle))
 741                         GOTO(cleanup, rc = PTR_ERR(handle));
 742                 if (rec->ur_tgt == NULL)        /* no target supplied */
 743                         rc = -EINVAL;           /* -EPROTO? */
 744                 else
 745                         rc = vfs_symlink(dir, dchild, rec->ur_tgt);
 746                 EXIT;
 747                 break;
 748         }
 749         case S_IFCHR:
 750         case S_IFBLK:
 751         case S_IFIFO:
 752         case S_IFSOCK:{
 753                 int rdev = rec->ur_rdev;
 754                 handle = fsfilt_start(obd, dir, FSFILT_OP_MKNOD, NULL);
 755                 if (IS_ERR(handle))
 756                         GOTO(cleanup, (handle = NULL, rc = PTR_ERR(handle)));
 757                 rc = vfs_mknod(dir, dchild, rec->ur_mode, rdev);
 758                 EXIT;
 759                 break;
 760         }
 761         default:
 762                 CERROR("bad file type %o creating %s\n", type, rec->ur_name);
 763                 dchild->d_fsdata = NULL;
 764                 GOTO(cleanup, rc = -EINVAL);
 765         }
 766
 767         /* In case we stored the desired inum in here, we want to clean up. */
 768         if (dchild->d_fsdata == (void *)(unsigned long)rec->ur_fid2->id)
 769                 dchild->d_fsdata = NULL;
 770
 771         if (rc) {
 772                 CDEBUG(D_INODE, "error during create: %d\n", rc);
 773                 GOTO(cleanup, rc);
 774         } else if (dchild->d_inode) {
 775                 struct iattr iattr;
 776                 struct inode *inode = dchild->d_inode;
 777                 struct mds_body *body;
 778
 779                 created = 1;
 780                 LTIME_S(iattr.ia_atime) = rec->ur_time;
 781                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
 782                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
 783                 iattr.ia_uid = rec->_ur_fsuid;
 784                 if (dir->i_mode & S_ISGID)
 785                         iattr.ia_gid = dir->i_gid;
 786                 else
 787                         iattr.ia_gid = rec->_ur_fsgid;
 788                 iattr.ia_valid = ATTR_UID | ATTR_GID | ATTR_ATIME |
 789                         ATTR_MTIME | ATTR_CTIME;
 790
 791                 if (rec->ur_fid2->id) {
 792                         LASSERT(rec->ur_fid2->id == inode->i_ino);
 793                         inode->i_generation = rec->ur_fid2->generation;
 794                         /* Dirtied and committed by the upcoming setattr. */
 795                         CDEBUG(D_INODE, "recreated ino %lu with gen %u\n",
 796                                inode->i_ino, inode->i_generation);
 797                 } else {
 798                         struct lustre_handle child_ino_lockh;
 799
 800                         CDEBUG(D_INODE, "created ino %lu with gen %x\n",
 801                                inode->i_ino, inode->i_generation);
 802
 803                         /* The inode we were allocated may have just been freed
 804                          * by an unlink operation.  We take this lock to
 805                          * synchronize against the matching reply-ack-lock taken
 806                          * in unlink, to avoid replay problems if this reply
 807                          * makes it out to the client but the unlink's does not.
 808                          * See bug 2029 for more detail.*/
 809                         rc = mds_lock_new_child(obd, inode, &child_ino_lockh);
 810                         if (rc != ELDLM_OK) {
 811                                 CERROR("error locking for unlink/create sync: "
 812                                        "%d\n", rc);
 813                         } else {
 814                                 ldlm_lock_decref(&child_ino_lockh, LCK_EX);
 815                         }
 816                 }
 817
 818                 rc = fsfilt_setattr(obd, dchild, handle, &iattr, 0);
 819                 if (rc)
 820                         CERROR("error on child setattr: rc = %d\n", rc);
 821
 822                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
 823                 rc = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
 824                 if (rc)
 825                         CERROR("error on parent setattr: rc = %d\n", rc);
 826
 827                 body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
 828                 mds_pack_inode2fid(obd, &body->fid1, inode);
 829                 mds_pack_inode2body(obd, body, inode);
 830         }
 831         EXIT;
 832
 833 cleanup:
 834         err = mds_finish_transno(mds, dir, handle, req, rc, 0);
 835
 836         if (rc && created) {
 837                 /* Destroy the file we just created.  This should not need
 838                  * extra journal credits, as we have already modified all of
 839                  * the blocks needed in order to create the file in the first
 840                  * place.
 841                  */
 842                 switch (type) {
 843                 case S_IFDIR:
 844                         err = vfs_rmdir(dir, dchild);
 845                         if (err)
 846                                 CERROR("rmdir in error path: %d\n", err);
 847                         break;
 848                 default:
 849                         err = vfs_unlink(dir, dchild);
 850                         if (err)
 851                                 CERROR("unlink in error path: %d\n", err);
 852                         break;
 853                 }
 854         } else {
 855                 rc = err;
 856         }
 857         switch (cleanup_phase) {
 858         case 2: /* child dentry */
 859                 l_dput(dchild);
 860         case 1: /* locked parent dentry */
 861 #ifdef S_PDIROPS
 862                 if (lockh[1].cookie != 0)
 863                         ldlm_lock_decref(lockh + 1, parent_mode);
 864 #endif
 865                 if (rc) {
 866                         ldlm_lock_decref(lockh, LCK_PW);
 867                 } else {
 868                         ptlrpc_save_lock (req, lockh, LCK_PW);
 869                 }
 870                 l_dput(dparent);
 871         case 0:
 872                 break;
 873         default:
 874                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
 875                 LBUG();
 876         }
 877         if (mea)
 878                 OBD_FREE(mea, mea_size);
 879         req->rq_status = rc;
 880         return 0;
 881 }
 882
 883 static int res_gt(struct ldlm_res_id *res1, struct ldlm_res_id *res2,
 884            ldlm_policy_data_t *p1, ldlm_policy_data_t *p2)
 885 {
 886         int i;
 887
 888         for (i = 0; i < RES_NAME_SIZE; i++) {
 889                 /* return 1 here, because enqueue_ordered will skip resources
 890                  * of all zeroes if they're sorted to the end of the list. */
 891                 if (res1->name[i] == 0 && res2->name[i] != 0)
 892                         return 1;
 893                 if (res2->name[i] == 0 && res1->name[i] != 0)
 894                         return 0;
 895
 896                 if (res1->name[i] > res2->name[i])
 897                         return 1;
 898                 if (res1->name[i] < res2->name[i])
 899                         return 0;
 900         }
 901
 902         if (!p1 || !p2)
 903                 return 0;
 904
 905         if (memcmp(p1, p2, sizeof(*p1)) < 0)
 906                 return 1;
 907
 908         return 0;
 909 }
 910
 911 /* This function doesn't use ldlm_match_or_enqueue because we're always called
 912  * with EX or PW locks, and the MDS is no longer allowed to match write locks,
 913  * because they take the place of local semaphores.
 914  *
 915  * One or two locks are taken in numerical order.  A res_id->name[0] of 0 means
 916  * no lock is taken for that res_id.  Must be at least one non-zero res_id. */
 917 int enqueue_ordered_locks(struct obd_device *obd, struct ldlm_res_id *p1_res_id,
 918                           struct lustre_handle *p1_lockh, int p1_lock_mode,
 919                           ldlm_policy_data_t *p1_policy,
 920                           struct ldlm_res_id *p2_res_id,
 921                           struct lustre_handle *p2_lockh, int p2_lock_mode,
 922                           ldlm_policy_data_t *p2_policy)
 923 {
 924         struct ldlm_res_id *res_id[2] = { p1_res_id, p2_res_id };
 925         struct lustre_handle *handles[2] = { p1_lockh, p2_lockh };
 926         int lock_modes[2] = { p1_lock_mode, p2_lock_mode };
 927         ldlm_policy_data_t *policies[2] = { p1_policy, p2_policy };
 928         int rc, flags;
 929         ENTRY;
 930
 931         LASSERT(p1_res_id != NULL && p2_res_id != NULL);
 932
 933         CDEBUG(D_INFO, "locks before: "LPU64"/"LPU64"\n", res_id[0]->name[0],
 934                res_id[1]->name[0]);
 935
 936         if (res_gt(p1_res_id, p2_res_id, p1_policy, p2_policy)) {
 937                 handles[1] = p1_lockh;
 938                 handles[0] = p2_lockh;
 939                 res_id[1] = p1_res_id;
 940                 res_id[0] = p2_res_id;
 941                 lock_modes[1] = p1_lock_mode;
 942                 lock_modes[0] = p2_lock_mode;
 943                 policies[1] = p1_policy;
 944                 policies[0] = p2_policy;
 945         }
 946
 947         CDEBUG(D_DLMTRACE, "lock order: "LPU64"/"LPU64"\n",
 948                res_id[0]->name[0], res_id[1]->name[0]);
 949
 950         flags = LDLM_FL_LOCAL_ONLY;
 951         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, *res_id[0],
 952                               LDLM_IBITS, policies[0], lock_modes[0], &flags,
 953                               mds_blocking_ast, ldlm_completion_ast, NULL, NULL,
 954                               NULL, 0, NULL, handles[0]);
 955         if (rc != ELDLM_OK)
 956                 RETURN(-EIO);
 957         ldlm_lock_dump_handle(D_OTHER, handles[0]);
 958
 959         if (!memcmp(res_id[0], res_id[1], sizeof(*res_id[0])) &&
 960             (policies[0]->l_inodebits.bits & policies[1]->l_inodebits.bits)) {
 961                 memcpy(handles[1], handles[0], sizeof(*(handles[1])));
 962                 ldlm_lock_addref(handles[1], lock_modes[1]);
 963         } else if (res_id[1]->name[0] != 0) {
 964                 flags = LDLM_FL_LOCAL_ONLY;
 965                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
 966                                       *res_id[1], LDLM_IBITS, policies[1],
 967                                       lock_modes[1], &flags, mds_blocking_ast,
 968                                       ldlm_completion_ast, NULL, NULL, NULL, 0,
 969                                       NULL, handles[1]);
 970                 if (rc != ELDLM_OK) {
 971                         ldlm_lock_decref(handles[0], lock_modes[0]);
 972                         RETURN(-EIO);
 973                 }
 974                 ldlm_lock_dump_handle(D_OTHER, handles[1]);
 975         }
 976
 977         RETURN(0);
 978 }
 979
 980 int enqueue_4ordered_locks(struct obd_device *obd,struct ldlm_res_id *p1_res_id,
 981                            struct lustre_handle *p1_lockh, int p1_lock_mode,
 982                            ldlm_policy_data_t *p1_policy,
 983                            struct ldlm_res_id *p2_res_id,
 984                            struct lustre_handle *p2_lockh, int p2_lock_mode,
 985                            ldlm_policy_data_t *p2_policy,
 986                            struct ldlm_res_id *c1_res_id,
 987                            struct lustre_handle *c1_lockh, int c1_lock_mode,
 988                            ldlm_policy_data_t *c1_policy,
 989                            struct ldlm_res_id *c2_res_id,
 990                            struct lustre_handle *c2_lockh, int c2_lock_mode,
 991                            ldlm_policy_data_t *c2_policy)
 992 {
 993         struct ldlm_res_id *res_id[5] = { p1_res_id, p2_res_id,
 994                                           c1_res_id, c2_res_id };
 995         struct lustre_handle *dlm_handles[5] = { p1_lockh, p2_lockh,
 996                                                  c1_lockh, c2_lockh };
 997         int lock_modes[5] = { p1_lock_mode, p2_lock_mode,
 998                               c1_lock_mode, c2_lock_mode };
 999         ldlm_policy_data_t *policies[5] = { p1_policy, p2_policy,
1000                                             c1_policy, c2_policy};
1001         int rc, i, j, sorted, flags;
1002         ENTRY;
1003
1004         CDEBUG(D_DLMTRACE,
1005                "locks before: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n",
1006                res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0],
1007                res_id[3]->name[0]);
1008
1009         /* simple insertion sort - we have at most 4 elements */
1010         for (i = 1; i < 4; i++) {
1011                 j = i - 1;
1012                 dlm_handles[4] = dlm_handles[i];
1013                 res_id[4] = res_id[i];
1014                 lock_modes[4] = lock_modes[i];
1015                 policies[4] = policies[i];
1016
1017                 sorted = 0;
1018                 do {
1019                         if (res_gt(res_id[j], res_id[4], policies[j],
1020                                    policies[4])) {
1021                                 dlm_handles[j + 1] = dlm_handles[j];
1022                                 res_id[j + 1] = res_id[j];
1023                                 lock_modes[j + 1] = lock_modes[j];
1024                                 policies[j + 1] = policies[j];
1025                                 j--;
1026                         } else {
1027                                 sorted = 1;
1028                         }
1029                 } while (j >= 0 && !sorted);
1030
1031                 dlm_handles[j + 1] = dlm_handles[4];
1032                 res_id[j + 1] = res_id[4];
1033                 lock_modes[j + 1] = lock_modes[4];
1034                 policies[j + 1] = policies[4];
1035         }
1036
1037         CDEBUG(D_DLMTRACE,
1038                "lock order: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n",
1039                res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0],
1040                res_id[3]->name[0]);
1041
1042         /* XXX we could send ASTs on all these locks first before blocking? */
1043         for (i = 0; i < 4; i++) {
1044                 flags = 0;
1045                 if (res_id[i]->name[0] == 0)
1046                         break;
1047                 if (i != 0 &&
1048                     !memcmp(res_id[i], res_id[i-1], sizeof(*res_id[i])) &&
1049                     (policies[i]->l_inodebits.bits &
1050                      policies[i-1]->l_inodebits.bits) ) {
1051                         memcpy(dlm_handles[i], dlm_handles[i-1],
1052                                sizeof(*(dlm_handles[i])));
1053                         ldlm_lock_addref(dlm_handles[i], lock_modes[i]);
1054                 } else {
1055                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1056                                               *res_id[i], LDLM_IBITS,
1057                                               policies[i],
1058                                               lock_modes[i], &flags,
1059                                               mds_blocking_ast,
1060                                               ldlm_completion_ast, NULL, NULL,
1061                                               NULL, 0, NULL, dlm_handles[i]);
1062                         if (rc != ELDLM_OK)
1063                                 GOTO(out_err, rc = -EIO);
1064                         ldlm_lock_dump_handle(D_OTHER, dlm_handles[i]);
1065                 }
1066         }
1067
1068         RETURN(0);
1069 out_err:
1070         while (i-- > 0)
1071                 ldlm_lock_decref(dlm_handles[i], lock_modes[i]);
1072
1073         return rc;
1074 }
1075
1076 /* In the unlikely case that the child changed while we were waiting
1077  * on the lock, we need to drop the lock on the old child and either:
1078  * - if the child has a lower resource name, then we have to also
1079  *   drop the parent lock and regain the locks in the right order
1080  * - in the rename case, if the child has a lower resource name than one of
1081  *   the other parent/child resources (maxres) we also need to reget the locks
1082  * - if the child has a higher resource name (this is the common case)
1083  *   we can just get the lock on the new child (still in lock order)
1084  *
1085  * Returns 0 if the child did not change or if it changed but could be locked.
1086  * Returns 1 if the child changed and we need to re-lock (no locks held).
1087  * Returns -ve error with a valid dchild (no locks held). */
1088 static int mds_verify_child(struct obd_device *obd,
1089                             struct ldlm_res_id *parent_res_id,
1090                             struct lustre_handle *parent_lockh,
1091                             struct dentry *dparent, int parent_mode,
1092                             struct ldlm_res_id *child_res_id,
1093                             struct lustre_handle *child_lockh,
1094                             struct dentry **dchildp, int child_mode,
1095                             ldlm_policy_data_t *child_policy,
1096                             const char *name, int namelen,
1097                             struct ldlm_res_id *maxres)
1098 {
1099         struct dentry *vchild, *dchild = *dchildp;
1100         int rc = 0, cleanup_phase = 2; /* parent, child locks */
1101         ENTRY;
1102
1103         vchild = ll_lookup_one_len(name, dparent, namelen - 1);
1104         if (IS_ERR(vchild))
1105                 GOTO(cleanup, rc = PTR_ERR(vchild));
1106
1107         if ((vchild->d_flags & DCACHE_CROSS_REF)) {
1108                 if  (child_res_id->name[0] == vchild->d_inum &&
1109                                 child_res_id->name[1] == vchild->d_generation) {
1110                         if (dchild != NULL)
1111                                 l_dput(dchild);
1112                         *dchildp = vchild;
1113                         RETURN(0);
1114                 }
1115                 goto changed;
1116         }
1117
1118         if (likely((vchild->d_inode == NULL && child_res_id->name[0] == 0) ||
1119                    (vchild->d_inode != NULL &&
1120                     child_res_id->name[0] == vchild->d_inode->i_ino &&
1121                     child_res_id->name[1] == vchild->d_inode->i_generation))) {
1122                 if (dchild != NULL)
1123                         l_dput(dchild);
1124                 *dchildp = vchild;
1125
1126                 RETURN(0);
1127         }
1128
1129 changed:
1130         CDEBUG(D_DLMTRACE, "child inode changed: %p != %p (%lu != "LPU64")\n",
1131                vchild->d_inode, dchild ? dchild->d_inode : 0,
1132                vchild->d_inode ? vchild->d_inode->i_ino : 0,
1133                child_res_id->name[0]);
1134         if (child_res_id->name[0] != 0)
1135                 ldlm_lock_decref(child_lockh, child_mode);
1136         if (dchild)
1137                 l_dput(dchild);
1138
1139         cleanup_phase = 1; /* parent lock only */
1140         *dchildp = dchild = vchild;
1141
1142         if (dchild->d_inode || (dchild->d_flags & DCACHE_CROSS_REF)) {
1143                 int flags = 0;
1144                 if (dchild->d_inode) {
1145                         child_res_id->name[0] = dchild->d_inode->i_ino;
1146                         child_res_id->name[1] = dchild->d_inode->i_generation;
1147                 } else {
1148                         child_res_id->name[0] = dchild->d_inum;
1149                         child_res_id->name[1] = dchild->d_generation;
1150                 }
1151
1152                 if (res_gt(parent_res_id, child_res_id, NULL, NULL) ||
1153                     res_gt(maxres, child_res_id, NULL, NULL)) {
1154                         CDEBUG(D_DLMTRACE, "relock "LPU64"<("LPU64"|"LPU64")\n",
1155                                child_res_id->name[0], parent_res_id->name[0],
1156                                maxres->name[0]);
1157                         GOTO(cleanup, rc = 1);
1158                 }
1159
1160                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1161                                       *child_res_id, LDLM_IBITS, child_policy,
1162                                       child_mode, &flags, mds_blocking_ast,
1163                                       ldlm_completion_ast, NULL, NULL, NULL, 0,
1164                                       NULL, child_lockh);
1165                 if (rc != ELDLM_OK)
1166                         GOTO(cleanup, rc = -EIO);
1167
1168         } else {
1169                 memset(child_res_id, 0, sizeof(*child_res_id));
1170         }
1171
1172         EXIT;
1173 cleanup:
1174         if (rc) {
1175                 switch(cleanup_phase) {
1176                 case 2:
1177                         if (child_res_id->name[0] != 0)
1178                                 ldlm_lock_decref(child_lockh, child_mode);
1179                 case 1:
1180                         ldlm_lock_decref(parent_lockh, parent_mode);
1181                 }
1182         }
1183         return rc;
1184 }
1185
1186 int mds_get_parent_child_locked(struct obd_device *obd, struct mds_obd *mds,
1187                                 struct ll_fid *fid,
1188                                 struct lustre_handle *parent_lockh,
1189                                 struct dentry **dparentp, int parent_mode,
1190                                 __u64 parent_lockpart, int *update_mode,
1191                                 char *name, int namelen,
1192                                 struct lustre_handle *child_lockh,
1193                                 struct dentry **dchildp, int child_mode,
1194                                 __u64 child_lockpart)
1195 {
1196         struct ldlm_res_id child_res_id = { .name = {0} };
1197         struct ldlm_res_id parent_res_id = { .name = {0} };
1198         ldlm_policy_data_t parent_policy = {.l_inodebits = { parent_lockpart }};
1199         ldlm_policy_data_t child_policy = {.l_inodebits = { child_lockpart }};
1200         struct inode *inode;
1201         int rc = 0, cleanup_phase = 0;
1202         ENTRY;
1203
1204         /* Step 1: Lookup parent */
1205         *dparentp = mds_fid2dentry(mds, fid, NULL);
1206         if (IS_ERR(*dparentp)) {
1207                 rc = PTR_ERR(*dparentp);
1208                 *dparentp = NULL;
1209                 RETURN(rc);
1210         }
1211
1212         CDEBUG(D_INODE, "parent ino %lu, name %s\n",
1213                (*dparentp)->d_inode->i_ino, name);
1214
1215         parent_res_id.name[0] = (*dparentp)->d_inode->i_ino;
1216         parent_res_id.name[1] = (*dparentp)->d_inode->i_generation;
1217 #ifdef S_PDIROPS
1218         parent_lockh[1].cookie = 0;
1219         if (name && IS_PDIROPS((*dparentp)->d_inode)) {
1220                 struct ldlm_res_id res_id = { .name = {0} };
1221                 ldlm_policy_data_t policy;
1222                 int flags = 0;
1223                 *update_mode = mds_lock_mode_for_dir(obd, *dparentp, parent_mode);
1224                 if (*update_mode) {
1225                         res_id.name[0] = (*dparentp)->d_inode->i_ino;
1226                         res_id.name[1] = (*dparentp)->d_inode->i_generation;
1227                         policy.l_inodebits.bits = MDS_INODELOCK_UPDATE;
1228                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1229                                               res_id, LDLM_IBITS, &policy,
1230                                               *update_mode, &flags,
1231                                               mds_blocking_ast,
1232                                               ldlm_completion_ast,
1233                                               NULL, NULL, NULL, 0, NULL,
1234                                               parent_lockh + 1);
1235                         if (rc != ELDLM_OK)
1236                                 RETURN(-ENOLCK);
1237                 }
1238
1239                 parent_res_id.name[2] = full_name_hash(name, namelen - 1);
1240                 CDEBUG(D_INFO, "take lock on %lu:%u:"LPX64"\n",
1241                        (*dparentp)->d_inode->i_ino,
1242                        (*dparentp)->d_inode->i_generation,
1243                        parent_res_id.name[2]);
1244         }
1245 #endif
1246
1247         cleanup_phase = 1; /* parent dentry */
1248
1249         /* Step 2: Lookup child (without DLM lock, to get resource name) */
1250         *dchildp = ll_lookup_one_len(name, *dparentp, namelen - 1);
1251         if (IS_ERR(*dchildp)) {
1252                 rc = PTR_ERR(*dchildp);
1253                 CDEBUG(D_INODE, "child lookup error %d\n", rc);
1254                 GOTO(cleanup, rc);
1255         }
1256
1257         if ((*dchildp)->d_flags & DCACHE_CROSS_REF) {
1258                 /* inode lives on another MDS: return * mds/ino/gen
1259                  * and LOOKUP lock. drop possible UPDATE lock! */
1260                 child_policy.l_inodebits.bits &= ~MDS_INODELOCK_UPDATE;
1261                 child_policy.l_inodebits.bits |= MDS_INODELOCK_LOOKUP;
1262                 child_res_id.name[0] = (*dchildp)->d_inum;
1263                 child_res_id.name[1] = (*dchildp)->d_generation;
1264                 goto retry_locks;
1265         }
1266
1267         inode = (*dchildp)->d_inode;
1268         if (inode != NULL)
1269                 inode = igrab(inode);
1270         if (inode == NULL)
1271                 goto retry_locks;
1272
1273         child_res_id.name[0] = inode->i_ino;
1274         child_res_id.name[1] = inode->i_generation;
1275
1276         iput(inode);
1277
1278 retry_locks:
1279         cleanup_phase = 2; /* child dentry */
1280
1281         /* Step 3: Lock parent and child in resource order.  If child doesn't
1282          *         exist, we still have to lock the parent and re-lookup. */
1283         rc = enqueue_ordered_locks(obd,&parent_res_id,parent_lockh,parent_mode,
1284                                    &parent_policy, &child_res_id, child_lockh,
1285                                    child_mode, &child_policy);
1286         if (rc)
1287                 GOTO(cleanup, rc);
1288
1289         if ((*dchildp)->d_inode || ((*dchildp)->d_flags & DCACHE_CROSS_REF))
1290                 cleanup_phase = 4; /* child lock */
1291         else
1292                 cleanup_phase = 3; /* parent lock */
1293
1294         /* Step 4: Re-lookup child to verify it hasn't changed since locking */
1295         rc = mds_verify_child(obd, &parent_res_id, parent_lockh, *dparentp,
1296                               parent_mode, &child_res_id, child_lockh,
1297                               dchildp, child_mode, &child_policy,
1298                               name, namelen, &parent_res_id);
1299         if (rc > 0)
1300                 goto retry_locks;
1301         if (rc < 0) {
1302                 cleanup_phase = 3;
1303                 GOTO(cleanup, rc);
1304         }
1305
1306 cleanup:
1307         if (rc) {
1308                 switch (cleanup_phase) {
1309                 case 4:
1310                         ldlm_lock_decref(child_lockh, child_mode);
1311                 case 3:
1312                         ldlm_lock_decref(parent_lockh, parent_mode);
1313                 case 2:
1314                         l_dput(*dchildp);
1315                 case 1:
1316 #ifdef S_PDIROPS
1317                         if (parent_lockh[1].cookie)
1318                                 ldlm_lock_decref(parent_lockh + 1, *update_mode);
1319 #endif
1320                         l_dput(*dparentp);
1321                 default: ;
1322                 }
1323         }
1324         return rc;
1325 }
1326
1327 void mds_reconstruct_generic(struct ptlrpc_request *req)
1328 {
1329         struct mds_export_data *med = &req->rq_export->exp_mds_data;
1330
1331         mds_req_from_mcd(req, med->med_mcd);
1332 }
1333
1334 int mds_create_local_dentry(struct mds_update_record *rec,
1335                            struct obd_device *obd)
1336 {
1337         struct mds_obd *mds = &obd->u.mds;
1338         struct inode *fids_dir = mds->mds_fids_dir->d_inode;
1339         int fidlen = 0, rc, cleanup_phase = 0;
1340         struct dentry *new_child = NULL;
1341         char *fidname = rec->ur_name;
1342         struct dentry *child = NULL;
1343         struct lustre_handle lockh[2] = {{0}, {0}};
1344         void *handle;
1345         ENTRY;
1346
1347         down(&fids_dir->i_sem);
1348         fidlen = ll_fid2str(fidname, rec->ur_fid1->id, rec->ur_fid1->generation);
1349         CDEBUG(D_OTHER, "look for local dentry '%s' for %u/%u\n",
1350                         fidname, (unsigned) rec->ur_fid1->id,
1351                         (unsigned) rec->ur_fid1->generation);
1352
1353         new_child = lookup_one_len(fidname, mds->mds_fids_dir, fidlen);
1354         up(&fids_dir->i_sem);
1355         if (IS_ERR(new_child)) {
1356                 CERROR("can't lookup %s: %d\n", fidname,
1357                                 (int) PTR_ERR(new_child));
1358                 GOTO(cleanup, rc = PTR_ERR(new_child));
1359         }
1360         cleanup_phase = 1;
1361
1362         if (new_child->d_inode != NULL) {
1363                 /* nice. we've already have local dentry! */
1364                 CDEBUG(D_OTHER, "found dentry in FIDS/: %u/%u\n",
1365                        (unsigned) new_child->d_inode->i_ino,
1366                        (unsigned) new_child->d_inode->i_generation);
1367                 rec->ur_fid1->id = fids_dir->i_ino;
1368                 rec->ur_fid1->generation = fids_dir->i_generation;
1369                 rec->ur_namelen = fidlen + 1;
1370                 GOTO(cleanup, rc = 0);
1371         }
1372
1373         /* new, local dentry will be added soon. we need no aliases here */
1374         d_drop(new_child);
1375
1376         if (rec->ur_mode & MDS_MODE_DONT_LOCK) {
1377                 child = mds_fid2dentry(mds, rec->ur_fid1, NULL);
1378         } else {
1379                 child = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL,
1380                                               LCK_EX, lockh, NULL, NULL, 0,
1381                                               MDS_INODELOCK_UPDATE);
1382         }
1383
1384         if (IS_ERR(child)) {
1385                 CERROR("can't get victim\n");
1386                 GOTO(cleanup, rc = PTR_ERR(child));
1387         }
1388         cleanup_phase = 2;
1389
1390         handle = fsfilt_start(obd, fids_dir, FSFILT_OP_LINK, NULL);
1391         if (IS_ERR(handle))
1392                 GOTO(cleanup, rc = PTR_ERR(handle));
1393
1394         rc = fsfilt_add_dir_entry(obd, mds->mds_fids_dir, fidname, fidlen,
1395                                   rec->ur_fid1->id, rec->ur_fid1->generation,
1396                                   mds->mds_num);
1397         if (rc)
1398                 CERROR("error linking orphan %lu/%lu to FIDS: rc = %d\n",
1399                        (unsigned long) child->d_inode->i_ino,
1400                        (unsigned long) child->d_inode->i_generation, rc);
1401         else {
1402                 if (S_ISDIR(child->d_inode->i_mode)) {
1403                         fids_dir->i_nlink++;
1404                         mark_inode_dirty(fids_dir);
1405                 }
1406                 mark_inode_dirty(child->d_inode);
1407         }
1408         fsfilt_commit(obd, mds->mds_sb, fids_dir, handle, 0);
1409
1410         rec->ur_fid1->id = fids_dir->i_ino;
1411         rec->ur_fid1->generation = fids_dir->i_generation;
1412         rec->ur_namelen = fidlen + 1;
1413
1414 cleanup:
1415         switch(cleanup_phase) {
1416                 case 2:
1417                         if (!(rec->ur_mode & MDS_MODE_DONT_LOCK))
1418                                 ldlm_lock_decref(lockh, LCK_EX);
1419                         dput(child);
1420                 case 1:
1421                         dput(new_child);
1422                 case 0:
1423                        break;
1424         }
1425         RETURN(rc);
1426 }
1427
1428 static int mds_copy_unlink_reply(struct ptlrpc_request *master,
1429                                         struct ptlrpc_request *slave)
1430 {
1431         void *cookie, *cookie2;
1432         struct mds_body *body2;
1433         struct mds_body *body;
1434         void *ea, *ea2;
1435         ENTRY;
1436
1437         body = lustre_msg_buf(slave->rq_repmsg, 0, sizeof(*body));
1438         LASSERT(body != NULL);
1439
1440         body2 = lustre_msg_buf(master->rq_repmsg, 0, sizeof (*body));
1441         LASSERT(body2 != NULL);
1442
1443         if (!(body->valid & (OBD_MD_FLID | OBD_MD_FLGENER))) {
1444                 RETURN(0);
1445         }
1446
1447         memcpy(body2, body, sizeof(*body));
1448         body2->valid &= ~OBD_MD_FLCOOKIE;
1449
1450         if (!(body->valid & OBD_MD_FLEASIZE) &&
1451             !(body->valid & OBD_MD_FLDIREA))
1452                 RETURN(0);
1453
1454         if (body->eadatasize == 0) {
1455                 CERROR("OBD_MD_FLEASIZE set but eadatasize zero\n");
1456                 RETURN(0);
1457         }
1458
1459         LASSERT(master->rq_repmsg->buflens[1] >= body->eadatasize);
1460
1461         ea = lustre_msg_buf(slave->rq_repmsg, 1, body->eadatasize);
1462         LASSERT(ea != NULL);
1463
1464         ea2 = lustre_msg_buf(master->rq_repmsg, 1, body->eadatasize);
1465         LASSERT(ea2 != NULL);
1466
1467         memcpy(ea2, ea, body->eadatasize);
1468
1469         if (body->valid & OBD_MD_FLCOOKIE) {
1470                 LASSERT(master->rq_repmsg->buflens[2] >=
1471                                 slave->rq_repmsg->buflens[2]);
1472                 cookie = lustre_msg_buf(slave->rq_repmsg, 2,
1473                                 slave->rq_repmsg->buflens[2]);
1474                 LASSERT(cookie != NULL);
1475
1476                 cookie2 = lustre_msg_buf(master->rq_repmsg, 2,
1477                                 master->rq_repmsg->buflens[2]);
1478                 LASSERT(cookie2 != NULL);
1479                 memcpy(cookie2, cookie, slave->rq_repmsg->buflens[2]);
1480                 body2->valid |= OBD_MD_FLCOOKIE;
1481         }
1482         RETURN(0);
1483 }
1484
1485 static int mds_reint_unlink_remote(struct mds_update_record *rec, int offset,
1486                                    struct ptlrpc_request *req,
1487                                    struct lustre_handle *parent_lockh,
1488                                    int update_mode,
1489                                    struct dentry *dparent,
1490                                    struct lustre_handle *child_lockh,
1491                                    struct dentry *dchild)
1492 {
1493         struct obd_device *obd = req->rq_export->exp_obd;
1494         struct mds_obd *mds = mds_req2mds(req);
1495         struct mdc_op_data op_data;
1496         int rc = 0, cleanup_phase = 0;
1497         struct ptlrpc_request *request = NULL;
1498         void *handle;
1499         ENTRY;
1500
1501         LASSERT(offset == 0 || offset == 2);
1502
1503         DEBUG_REQ(D_INODE, req, "unlink %*s (remote inode %u/%u/%u)",
1504                   rec->ur_namelen - 1, rec->ur_name, (unsigned)dchild->d_mdsnum,
1505                   (unsigned) dchild->d_inum, (unsigned) dchild->d_generation);
1506         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1507                 DEBUG_REQ(D_HA, req, "unlink %*s (remote inode %u/%u/%u)",
1508                           rec->ur_namelen - 1, rec->ur_name,
1509                           (unsigned)dchild->d_mdsnum,
1510                           (unsigned) dchild->d_inum,
1511                           (unsigned) dchild->d_generation);
1512
1513         /* time to drop i_nlink on remote MDS */
1514         memset(&op_data, 0, sizeof(op_data));
1515         op_data.fid1.mds = dchild->d_mdsnum;
1516         op_data.fid1.id = dchild->d_inum;
1517         op_data.fid1.generation = dchild->d_generation;
1518         op_data.create_mode = rec->ur_mode;
1519         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1520                 op_data.create_mode |= MDS_MODE_REPLAY;
1521         rc = md_unlink(mds->mds_lmv_exp, &op_data, &request);
1522         cleanup_phase = 2;
1523         if (request) {
1524                 mds_copy_unlink_reply(req, request);
1525                 ptlrpc_req_finished(request);
1526         }
1527         if (rc == 0) {
1528                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_RMDIR,
1529                                       NULL);
1530                 if (IS_ERR(handle))
1531                         GOTO(cleanup, rc = PTR_ERR(handle));
1532                 rc = fsfilt_del_dir_entry(req->rq_export->exp_obd, dchild);
1533                 rc = mds_finish_transno(mds, dparent->d_inode, handle, req,
1534                                         rc, 0);
1535         }
1536 cleanup:
1537         req->rq_status = rc;
1538
1539 #ifdef S_PDIROPS
1540         if (parent_lockh[1].cookie != 0)
1541                 ldlm_lock_decref(parent_lockh + 1, update_mode);
1542 #endif
1543         ldlm_lock_decref(child_lockh, LCK_EX);
1544         if (rc)
1545                 ldlm_lock_decref(parent_lockh, LCK_PW);
1546         else
1547                 ptlrpc_save_lock(req, parent_lockh, LCK_PW);
1548         l_dput(dchild);
1549         l_dput(dparent);
1550
1551         return 0;
1552 }
1553
1554 static int mds_reint_unlink(struct mds_update_record *rec, int offset,
1555                             struct ptlrpc_request *req,
1556                             struct lustre_handle *lh)
1557 {
1558         struct dentry *dparent, *dchild;
1559         struct mds_obd *mds = mds_req2mds(req);
1560         struct obd_device *obd = req->rq_export->exp_obd;
1561         struct mds_body *body = NULL;
1562         struct inode *child_inode;
1563         struct lustre_handle parent_lockh[2] = {{0}, {0}};
1564         struct lustre_handle child_lockh = {0}, child_reuse_lockh = {0};
1565         struct lustre_handle * slave_lockh = NULL;
1566         char fidname[LL_FID_NAMELEN];
1567         void *handle = NULL;
1568         int rc = 0, log_unlink = 0, cleanup_phase = 0;
1569         int unlink_by_fid = 0;
1570         int update_mode;
1571         ENTRY;
1572
1573         LASSERT(offset == 0 || offset == 2);
1574
1575         DEBUG_REQ(D_INODE, req, "parent ino "LPU64"/%u, child %s",
1576                   rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_name);
1577
1578         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1579
1580         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNLINK))
1581                 GOTO(cleanup, rc = -ENOENT);
1582
1583         if (rec->ur_namelen == 1) {
1584                 /* this is request to drop i_nlink on local inode */
1585                 unlink_by_fid = 1;
1586                 rec->ur_name = fidname;
1587                 rc = mds_create_local_dentry(rec, obd);
1588                 if (rc == -ENOENT || (rec->ur_mode & MDS_MODE_REPLAY)) {
1589                         DEBUG_REQ(D_HA, req,
1590                                   "drop nlink on inode %u/%u/%u (replay)",
1591                                   (unsigned) rec->ur_fid1->mds,
1592                                   (unsigned) rec->ur_fid1->id,
1593                                   (unsigned) rec->ur_fid1->generation);
1594                         req->rq_status = 0;
1595                         RETURN(0);
1596                 }
1597         }
1598
1599         if (rec->ur_mode & MDS_MODE_DONT_LOCK) {
1600                 /* master mds for directory asks slave removing
1601                  * inode is already locked */
1602                 dparent = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL,
1603                                                LCK_PW, parent_lockh,
1604                                                &update_mode, rec->ur_name,
1605                                                rec->ur_namelen,
1606                                                MDS_INODELOCK_UPDATE);
1607                 if (IS_ERR(dparent))
1608                         GOTO(cleanup, rc = PTR_ERR(dparent));
1609                 dchild = ll_lookup_one_len(rec->ur_name, dparent,
1610                                            rec->ur_namelen - 1);
1611                 if (IS_ERR(dchild))
1612                         GOTO(cleanup, rc = PTR_ERR(dchild));
1613                 child_lockh.cookie = 0;
1614                 LASSERT(!(dchild->d_flags & DCACHE_CROSS_REF));
1615                 LASSERT(dchild->d_inode != NULL);
1616                 LASSERT(S_ISDIR(dchild->d_inode->i_mode));
1617         } else {
1618                 rc = mds_get_parent_child_locked(obd, mds, rec->ur_fid1,
1619                                                  parent_lockh, &dparent,
1620                                                  LCK_PW, MDS_INODELOCK_UPDATE,
1621                                                  &update_mode, rec->ur_name,
1622                                                  rec->ur_namelen, &child_lockh,
1623                                                  &dchild, LCK_EX,
1624                                                  MDS_INODELOCK_LOOKUP |
1625                                                         MDS_INODELOCK_UPDATE);
1626         }
1627         if (rc)
1628                 GOTO(cleanup, rc);
1629
1630         if (dchild->d_flags & DCACHE_CROSS_REF) {
1631                 /* we should have parent lock only here */
1632                 LASSERT(unlink_by_fid == 0);
1633                 LASSERT(dchild->d_mdsnum != mds->mds_num);
1634                 mds_reint_unlink_remote(rec, offset, req, parent_lockh,
1635                                         update_mode, dparent, &child_lockh, dchild);
1636                 RETURN(0);
1637         }
1638
1639         cleanup_phase = 1; /* dchild, dparent, locks */
1640
1641         dget(dchild);
1642         child_inode = dchild->d_inode;
1643         if (child_inode == NULL) {
1644                 CDEBUG(D_INODE, "child doesn't exist (dir %lu, name %s)\n",
1645                        dparent ? dparent->d_inode->i_ino : 0, rec->ur_name);
1646                 GOTO(cleanup, rc = -ENOENT);
1647         }
1648
1649         cleanup_phase = 2; /* dchild has a lock */
1650
1651         /* We have to do these checks ourselves, in case we are making an
1652          * orphan.  The client tells us whether rmdir() or unlink() was called,
1653          * so we need to return appropriate errors (bug 72).
1654          *
1655          * We don't have to check permissions, because vfs_rename (called from
1656          * mds_open_unlink_rename) also calls may_delete. */
1657         if ((rec->ur_mode & S_IFMT) == S_IFDIR) {
1658                 if (!S_ISDIR(child_inode->i_mode))
1659                         GOTO(cleanup, rc = -ENOTDIR);
1660         } else {
1661                 if (S_ISDIR(child_inode->i_mode))
1662                         GOTO(cleanup, rc = -EISDIR);
1663         }
1664
1665         /* handle splitted dir */
1666         rc = mds_lock_slave_objs(obd, dchild, &slave_lockh);
1667         if (rc)
1668                 GOTO(cleanup, rc);
1669
1670         /* Step 4: Get a lock on the ino to sync with creation WRT inode
1671          * reuse (see bug 2029). */
1672         rc = mds_lock_new_child(obd, child_inode, &child_reuse_lockh);
1673         if (rc != ELDLM_OK)
1674                 GOTO(cleanup, rc);
1675
1676         cleanup_phase = 3; /* child inum lock */
1677
1678         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_UNLINK_WRITE, dparent->d_inode->i_sb);
1679
1680         /* ldlm_reply in buf[0] if called via intent */
1681         if (offset)
1682                 offset = 1;
1683
1684         body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
1685         LASSERT(body != NULL);
1686
1687         /* If this is the last reference to this inode, get the OBD EA
1688          * data first so the client can destroy OST objects.
1689          * we only do the object removal if no open files remain.
1690          * Nobody can get at this name anymore because of the locks so
1691          * we make decisions here as to whether to remove the inode */
1692         if (S_ISREG(child_inode->i_mode) && child_inode->i_nlink == 1 &&
1693             mds_open_orphan_count(child_inode) == 0) {
1694                 mds_pack_inode2fid(obd, &body->fid1, child_inode);
1695                 mds_pack_inode2body(obd, body, child_inode);
1696                 mds_pack_md(obd, req->rq_repmsg, offset + 1, body,
1697                             child_inode, 1);
1698                 if (!(body->valid & OBD_MD_FLEASIZE)) {
1699                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1700                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
1701                 } else {
1702                         log_unlink = 1;
1703                 }
1704         }
1705
1706         /* Step 4: Do the unlink: we already verified ur_mode above (bug 72) */
1707         switch (child_inode->i_mode & S_IFMT) {
1708         case S_IFDIR:
1709                 /* Drop any lingering child directories before we start our
1710                  * transaction, to avoid doing multiple inode dirty/delete
1711                  * in our compound transaction (bug 1321). */
1712                 shrink_dcache_parent(dchild);
1713                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_RMDIR,
1714                                       NULL);
1715                 if (IS_ERR(handle))
1716                         GOTO(cleanup, rc = PTR_ERR(handle));
1717                 cleanup_phase = 4; /* transaction */
1718                 rc = vfs_rmdir(dparent->d_inode, dchild);
1719                 break;
1720         case S_IFREG: {
1721 #warning "optimization is possible here: we could drop nlink w/o removing local dentry in FIDS/"
1722                 struct lov_mds_md *lmm = lustre_msg_buf(req->rq_repmsg,
1723                                                         offset + 1, 0);
1724                 handle = fsfilt_start_log(obd, dparent->d_inode,
1725                                           FSFILT_OP_UNLINK, NULL,
1726                                           le32_to_cpu(lmm->lmm_stripe_count));
1727                 if (IS_ERR(handle))
1728                         GOTO(cleanup, rc = PTR_ERR(handle));
1729
1730                 cleanup_phase = 4; /* transaction */
1731                 rc = vfs_unlink(dparent->d_inode, dchild);
1732
1733                 if (!rc && log_unlink)
1734                         if (mds_log_op_unlink(obd, child_inode,
1735                                 lustre_msg_buf(req->rq_repmsg, offset + 1, 0),
1736                                 req->rq_repmsg->buflens[offset + 1],
1737                                 lustre_msg_buf(req->rq_repmsg, offset + 2, 0),
1738                                 req->rq_repmsg->buflens[offset + 2]) > 0)
1739                                 body->valid |= OBD_MD_FLCOOKIE;
1740                 break;
1741         }
1742         case S_IFLNK:
1743         case S_IFCHR:
1744         case S_IFBLK:
1745         case S_IFIFO:
1746         case S_IFSOCK:
1747                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK,
1748                                       NULL);
1749                 if (IS_ERR(handle))
1750                         GOTO(cleanup, rc = PTR_ERR(handle));
1751                 cleanup_phase = 4; /* transaction */
1752                 rc = vfs_unlink(dparent->d_inode, dchild);
1753                 break;
1754         default:
1755                 CERROR("bad file type %o unlinking %s\n", rec->ur_mode,
1756                        rec->ur_name);
1757                 LBUG();
1758                 GOTO(cleanup, rc = -EINVAL);
1759         }
1760
1761  cleanup:
1762         if (rc == 0) {
1763                 struct iattr iattr;
1764                 int err;
1765
1766                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
1767                 LTIME_S(iattr.ia_mtime) = LTIME_S(rec->ur_time);
1768                 LTIME_S(iattr.ia_ctime) = LTIME_S(rec->ur_time);
1769
1770                 err = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
1771                 if (err)
1772                         CERROR("error on parent setattr: rc = %d\n", err);
1773         }
1774
1775         switch(cleanup_phase) {
1776         case 4:
1777                 LASSERT(dchild != NULL && dchild->d_inode != NULL);
1778                 LASSERT(atomic_read(&dchild->d_inode->i_count) > 0);
1779                 if (rc == 0 && dchild->d_inode->i_nlink == 0 &&
1780                                 mds_open_orphan_count(dchild->d_inode) > 0) {
1781
1782                         /* filesystem is really going to destroy an inode
1783                          * we have to delay this till inode is opened -bzzz */
1784                         mds_open_unlink_rename(rec, obd, dparent, dchild, NULL);
1785                 }
1786                 /* handle splitted dir */
1787                 mds_unlink_slave_objs(obd, dchild);
1788                 rc = mds_finish_transno(mds, dparent->d_inode, handle, req,
1789                                         rc, 0);
1790                 if (!rc)
1791                         (void)obd_set_info(mds->mds_osc_exp, strlen("unlinked"),
1792                                            "unlinked", 0, NULL);
1793         case 3: /* child ino-reuse lock */
1794                 if (rc && body != NULL) {
1795                         // Don't unlink the OST objects if the MDS unlink failed
1796                         body->valid = 0;
1797                 }
1798                 if (rc)
1799                         ldlm_lock_decref(&child_reuse_lockh, LCK_EX);
1800                 else
1801                         ptlrpc_save_lock(req, &child_reuse_lockh, LCK_EX);
1802         case 2: /* child lock */
1803                 mds_unlock_slave_objs(obd, dchild, slave_lockh);
1804                 if (child_lockh.cookie)
1805                         ldlm_lock_decref(&child_lockh, LCK_EX);
1806         case 1: /* child and parent dentry, parent lock */
1807 #ifdef S_PDIROPS
1808                 if (parent_lockh[1].cookie != 0)
1809                         ldlm_lock_decref(parent_lockh + 1, update_mode);
1810 #endif
1811                 if (rc)
1812                         ldlm_lock_decref(parent_lockh, LCK_PW);
1813                 else
1814                         ptlrpc_save_lock(req, parent_lockh, LCK_PW);
1815                 l_dput(dchild);
1816                 l_dput(dchild);
1817                 l_dput(dparent);
1818         case 0:
1819                 break;
1820         default:
1821                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1822                 LBUG();
1823         }
1824         req->rq_status = rc;
1825         return 0;
1826 }
1827
1828 /*
1829  * to service requests from remote MDS to increment i_nlink
1830  */
1831 static int mds_reint_link_acquire(struct mds_update_record *rec,
1832                                  int offset, struct ptlrpc_request *req,
1833                                  struct lustre_handle *lh)
1834 {
1835         struct obd_device *obd = req->rq_export->exp_obd;
1836         struct ldlm_res_id src_res_id = { .name = {0} };
1837         struct lustre_handle *handle = NULL, src_lockh = {0};
1838         struct mds_obd *mds = mds_req2mds(req);
1839         int rc = 0, cleanup_phase = 0;
1840         struct dentry *de_src = NULL;
1841         ldlm_policy_data_t policy;
1842         int flags = 0;
1843         ENTRY;
1844
1845         DEBUG_REQ(D_INODE, req, "%s: request to acquire i_nlinks %u/%u/%u\n",
1846                   obd->obd_name, (unsigned) rec->ur_fid1->mds,
1847                   (unsigned) rec->ur_fid1->id,
1848                   (unsigned) rec->ur_fid1->generation);
1849
1850         /* Step 1: Lookup the source inode and target directory by FID */
1851         de_src = mds_fid2dentry(mds, rec->ur_fid1, NULL);
1852         if (IS_ERR(de_src))
1853                 GOTO(cleanup, rc = PTR_ERR(de_src));
1854         cleanup_phase = 1; /* source dentry */
1855
1856         src_res_id.name[0] = de_src->d_inode->i_ino;
1857         src_res_id.name[1] = de_src->d_inode->i_generation;
1858         policy.l_inodebits.bits = MDS_INODELOCK_UPDATE;
1859
1860         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1861                         src_res_id, LDLM_IBITS, &policy,
1862                         LCK_EX, &flags, mds_blocking_ast,
1863                         ldlm_completion_ast, NULL, NULL,
1864                         NULL, 0, NULL, &src_lockh);
1865         if (rc != ELDLM_OK)
1866                 GOTO(cleanup, rc = -ENOLCK);
1867         cleanup_phase = 2; /* lock */
1868
1869         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_src->d_inode->i_sb);
1870
1871         handle = fsfilt_start(obd, de_src->d_inode, FSFILT_OP_LINK, NULL);
1872         if (IS_ERR(handle)) {
1873                 rc = PTR_ERR(handle);
1874                 GOTO(cleanup, rc);
1875         }
1876         de_src->d_inode->i_nlink++;
1877         mark_inode_dirty(de_src->d_inode);
1878
1879 cleanup:
1880         rc = mds_finish_transno(mds, de_src ? de_src->d_inode : NULL,
1881                                         handle, req, rc, 0);
1882         EXIT;
1883         switch (cleanup_phase) {
1884                 case 2:
1885                         if (rc)
1886                                 ldlm_lock_decref(&src_lockh, LCK_EX);
1887                         else
1888                                 ptlrpc_save_lock(req, &src_lockh, LCK_EX);
1889                 case 1:
1890                         l_dput(de_src);
1891                 case 0:
1892                         break;
1893                 default:
1894                         CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1895                         LBUG();
1896         }
1897         req->rq_status = rc;
1898         return 0;
1899 }
1900
1901 /*
1902  * request to link to foreign inode:
1903  *  - acquire i_nlinks on this inode
1904  *  - add dentry
1905  */
1906 static int mds_reint_link_to_remote(struct mds_update_record *rec,
1907                                     int offset, struct ptlrpc_request *req,
1908                                     struct lustre_handle *lh)
1909 {
1910         struct lustre_handle *handle = NULL, tgt_dir_lockh[2] = {{0}, {0}};
1911         struct obd_device *obd = req->rq_export->exp_obd;
1912         struct dentry *de_tgt_dir = NULL;
1913         struct mds_obd *mds = mds_req2mds(req);
1914         int rc = 0, cleanup_phase = 0;
1915         struct mdc_op_data op_data;
1916         struct ptlrpc_request *request = NULL;
1917         int update_mode;
1918         ENTRY;
1919
1920 #define fmt     "%s: request to link %u/%u/%u:%*s to foreign inode %u/%u/%u\n"
1921         DEBUG_REQ(D_INODE, req, fmt, obd->obd_name,
1922                   (unsigned) rec->ur_fid2->mds,
1923                   (unsigned) rec->ur_fid2->id,
1924                   (unsigned) rec->ur_fid2->generation,
1925                   rec->ur_namelen - 1, rec->ur_name,
1926                   (unsigned) rec->ur_fid1->mds,
1927                   (unsigned) rec->ur_fid1->id,
1928                   (unsigned)rec->ur_fid1->generation);
1929
1930         de_tgt_dir = mds_fid2locked_dentry(obd, rec->ur_fid2, NULL, LCK_EX,
1931                                            tgt_dir_lockh, &update_mode,
1932                                            rec->ur_name, rec->ur_namelen - 1,
1933                                            MDS_INODELOCK_UPDATE);
1934         if (IS_ERR(de_tgt_dir))
1935                 GOTO(cleanup, rc = PTR_ERR(de_tgt_dir));
1936         cleanup_phase = 1;
1937
1938         op_data.fid1 = *(rec->ur_fid1);
1939         op_data.namelen = 0;
1940         op_data.name = NULL;
1941         rc = md_link(mds->mds_lmv_exp, &op_data, &request);
1942         if (rc)
1943                 GOTO(cleanup, rc);
1944
1945         cleanup_phase = 2;
1946         if (request)
1947                 ptlrpc_req_finished(request);
1948
1949         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_tgt_dir->d_inode->i_sb);
1950
1951         handle = fsfilt_start(obd, de_tgt_dir->d_inode, FSFILT_OP_LINK, NULL);
1952         if (IS_ERR(handle)) {
1953                 rc = PTR_ERR(handle);
1954                 GOTO(cleanup, rc);
1955         }
1956
1957         rc = fsfilt_add_dir_entry(obd, de_tgt_dir, rec->ur_name,
1958                                   rec->ur_namelen - 1, rec->ur_fid1->id,
1959                                   rec->ur_fid1->generation, rec->ur_fid1->mds);
1960         cleanup_phase = 3;
1961
1962 cleanup:
1963         rc = mds_finish_transno(mds, de_tgt_dir ? de_tgt_dir->d_inode : NULL,
1964                                 handle, req, rc, 0);
1965         EXIT;
1966
1967         switch (cleanup_phase) {
1968                 case 3:
1969                         if (rc) {
1970                                 /* FIXME: drop i_nlink on remote inode here */
1971                                 CERROR("MUST drop drop i_nlink here\n");
1972                         }
1973                 case 2:
1974                 case 1:
1975                         if (rc) {
1976                                 ldlm_lock_decref(tgt_dir_lockh, LCK_EX);
1977 #ifdef S_PDIROPS
1978                                 ldlm_lock_decref(tgt_dir_lockh + 1, update_mode);
1979 #endif
1980                         } else {
1981                                 ptlrpc_save_lock(req, tgt_dir_lockh, LCK_EX);
1982 #ifdef S_PDIROPS
1983                                 ptlrpc_save_lock(req, tgt_dir_lockh+1, update_mode);
1984 #endif
1985                         }
1986                         l_dput(de_tgt_dir);
1987                         break;
1988                 default:
1989                         CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1990                         LBUG();
1991         }
1992         req->rq_status = rc;
1993         return 0;
1994 }
1995
1996 static int mds_reint_link(struct mds_update_record *rec, int offset,
1997                           struct ptlrpc_request *req,
1998                           struct lustre_handle *lh)
1999 {
2000         struct obd_device *obd = req->rq_export->exp_obd;
2001         struct dentry *de_src = NULL;
2002         struct dentry *de_tgt_dir = NULL;
2003         struct dentry *dchild = NULL;
2004         struct mds_obd *mds = mds_req2mds(req);
2005         struct lustre_handle *handle = NULL;
2006         struct lustre_handle tgt_dir_lockh[2] = {{0}, {0}}, src_lockh = {0};
2007         struct ldlm_res_id src_res_id = { .name = {0} };
2008         struct ldlm_res_id tgt_dir_res_id = { .name = {0} };
2009         ldlm_policy_data_t src_policy ={.l_inodebits = {MDS_INODELOCK_UPDATE}};
2010         ldlm_policy_data_t tgt_dir_policy =
2011                                        {.l_inodebits = {MDS_INODELOCK_UPDATE}};
2012         int rc = 0, cleanup_phase = 0;
2013         int update_mode = 0;
2014         ENTRY;
2015
2016         LASSERT(offset == 0);
2017
2018         DEBUG_REQ(D_INODE, req, "original "LPU64"/%u to "LPU64"/%u %s",
2019                   rec->ur_fid1->id, rec->ur_fid1->generation,
2020                   rec->ur_fid2->id, rec->ur_fid2->generation, rec->ur_name);
2021
2022         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
2023
2024 //      memset(tgt_dir_lockh, 0, 2*sizeof(tgt_dir_lockh[0]));
2025         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_LINK))
2026                 GOTO(cleanup, rc = -ENOENT);
2027
2028         if (rec->ur_fid1->mds != mds->mds_num) {
2029                 rc = mds_reint_link_to_remote(rec, offset, req, lh);
2030                 RETURN(rc);
2031         }
2032
2033         if (rec->ur_namelen == 1) {
2034                 rc = mds_reint_link_acquire(rec, offset, req, lh);
2035                 RETURN(rc);
2036         }
2037
2038         /* Step 1: Lookup the source inode and target directory by FID */
2039         de_src = mds_fid2dentry(mds, rec->ur_fid1, NULL);
2040         if (IS_ERR(de_src))
2041                 GOTO(cleanup, rc = PTR_ERR(de_src));
2042
2043         cleanup_phase = 1; /* source dentry */
2044
2045         de_tgt_dir = mds_fid2dentry(mds, rec->ur_fid2, NULL);
2046         if (IS_ERR(de_tgt_dir)) {
2047                 rc = PTR_ERR(de_tgt_dir);
2048                 de_tgt_dir = NULL;
2049                 GOTO(cleanup, rc);
2050         }
2051
2052         cleanup_phase = 2; /* target directory dentry */
2053
2054         CDEBUG(D_INODE, "linking %*s/%s to inode %lu\n",
2055                de_tgt_dir->d_name.len, de_tgt_dir->d_name.name, rec->ur_name,
2056                de_src->d_inode->i_ino);
2057
2058         /* Step 2: Take the two locks */
2059         src_res_id.name[0] = de_src->d_inode->i_ino;
2060         src_res_id.name[1] = de_src->d_inode->i_generation;
2061         tgt_dir_res_id.name[0] = de_tgt_dir->d_inode->i_ino;
2062         tgt_dir_res_id.name[1] = de_tgt_dir->d_inode->i_generation;
2063 #ifdef S_PDIROPS
2064         if (IS_PDIROPS(de_tgt_dir->d_inode)) {
2065                 int flags = 0;
2066                 update_mode = mds_lock_mode_for_dir(obd, de_tgt_dir, LCK_EX);
2067                 if (update_mode) {
2068                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
2069                                               tgt_dir_res_id, LDLM_IBITS,
2070                                               &src_policy, update_mode, &flags,
2071                                               mds_blocking_ast,
2072                                               ldlm_completion_ast, NULL, NULL,
2073                                               NULL, 0, NULL, tgt_dir_lockh + 1);
2074                         if (rc != ELDLM_OK)
2075                                 GOTO(cleanup, rc = -ENOLCK);
2076                 }
2077
2078                 tgt_dir_res_id.name[2] = full_name_hash(rec->ur_name,
2079                                                         rec->ur_namelen - 1);
2080                 CDEBUG(D_INFO, "take lock on %lu:%u:"LPX64"\n",
2081                        de_tgt_dir->d_inode->i_ino,
2082                        de_tgt_dir->d_inode->i_generation,
2083                        tgt_dir_res_id.name[2]);
2084         }
2085 #endif
2086         rc = enqueue_ordered_locks(obd, &src_res_id, &src_lockh, LCK_EX,
2087                                    &src_policy,
2088                                    &tgt_dir_res_id, tgt_dir_lockh, LCK_EX,
2089                                    &tgt_dir_policy);
2090         if (rc)
2091                 GOTO(cleanup, rc);
2092
2093         cleanup_phase = 3; /* locks */
2094
2095         /* Step 3: Lookup the child */
2096         dchild = ll_lookup_one_len(rec->ur_name, de_tgt_dir, rec->ur_namelen-1);
2097         if (IS_ERR(dchild)) {
2098                 rc = PTR_ERR(dchild);
2099                 if (rc != -EPERM && rc != -EACCES)
2100                         CERROR("child lookup error %d\n", rc);
2101                 GOTO(cleanup, rc);
2102         }
2103
2104         cleanup_phase = 4; /* child dentry */
2105
2106         if (dchild->d_inode) {
2107                 CDEBUG(D_INODE, "child exists (dir %lu, name %s)\n",
2108                        de_tgt_dir->d_inode->i_ino, rec->ur_name);
2109                 rc = -EEXIST;
2110                 GOTO(cleanup, rc);
2111         }
2112
2113         /* Step 4: Do it. */
2114         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_src->d_inode->i_sb);
2115
2116         handle = fsfilt_start(obd, de_tgt_dir->d_inode, FSFILT_OP_LINK, NULL);
2117         if (IS_ERR(handle)) {
2118                 rc = PTR_ERR(handle);
2119                 GOTO(cleanup, rc);
2120         }
2121
2122         rc = vfs_link(de_src, de_tgt_dir->d_inode, dchild);
2123         if (rc && rc != -EPERM && rc != -EACCES)
2124                 CERROR("vfs_link error %d\n", rc);
2125 cleanup:
2126         rc = mds_finish_transno(mds, de_tgt_dir ? de_tgt_dir->d_inode : NULL,
2127                                 handle, req, rc, 0);
2128         EXIT;
2129
2130         switch (cleanup_phase) {
2131         case 4: /* child dentry */
2132                 l_dput(dchild);
2133         case 3: /* locks */
2134                 if (rc) {
2135                         ldlm_lock_decref(&src_lockh, LCK_EX);
2136                         ldlm_lock_decref(tgt_dir_lockh, LCK_EX);
2137                 } else {
2138                         ptlrpc_save_lock(req, &src_lockh, LCK_EX);
2139                         ptlrpc_save_lock(req, tgt_dir_lockh, LCK_EX);
2140                 }
2141         case 2: /* target dentry */
2142 #ifdef S_PDIROPS
2143                 if (tgt_dir_lockh[1].cookie && update_mode)
2144                         ldlm_lock_decref(tgt_dir_lockh + 1, update_mode);
2145 #endif
2146                 if (de_tgt_dir)
2147                         l_dput(de_tgt_dir);
2148         case 1: /* source dentry */
2149                 l_dput(de_src);
2150         case 0:
2151                 break;
2152         default:
2153                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2154                 LBUG();
2155         }
2156         req->rq_status = rc;
2157         return 0;
2158 }
2159
2160 /*
2161  * add a hard link in the PENDING directory, only used by rename()
2162  */
2163 static int mds_add_link_orphan(struct mds_update_record *rec,
2164                                struct obd_device *obd,
2165                                struct dentry *dentry)
2166 {
2167         struct mds_obd *mds = &obd->u.mds;
2168         struct inode *pending_dir = mds->mds_pending_dir->d_inode;
2169         struct dentry *pending_child;
2170         char fidname[LL_FID_NAMELEN];
2171         int fidlen = 0, rc;
2172         ENTRY;
2173
2174         LASSERT(dentry->d_inode);
2175         LASSERT(!mds_inode_is_orphan(dentry->d_inode));
2176
2177         down(&pending_dir->i_sem);
2178         fidlen = ll_fid2str(fidname, dentry->d_inode->i_ino,
2179                             dentry->d_inode->i_generation);
2180
2181         CDEBUG(D_ERROR, "pending destroy of %dx open file %s = %s\n",
2182                mds_open_orphan_count(dentry->d_inode),
2183                rec->ur_name, fidname);
2184
2185         pending_child = lookup_one_len(fidname, mds->mds_pending_dir, fidlen);
2186         if (IS_ERR(pending_child))
2187                 GOTO(out_lock, rc = PTR_ERR(pending_child));
2188
2189         if (pending_child->d_inode != NULL) {
2190                 CERROR("re-destroying orphan file %s?\n", rec->ur_name);
2191                 LASSERT(pending_child->d_inode == dentry->d_inode);
2192                 GOTO(out_dput, rc = 0);
2193         }
2194
2195         lock_kernel();
2196         rc = vfs_link(dentry, pending_dir, pending_child);
2197         unlock_kernel();
2198         if (rc)
2199                 CERROR("error addlink orphan %s to PENDING: rc = %d\n",
2200                        rec->ur_name, rc);
2201         else
2202                 mds_inode_set_orphan(dentry->d_inode);
2203 out_dput:
2204         l_dput(pending_child);
2205 out_lock:
2206         up(&pending_dir->i_sem);
2207         RETURN(rc);
2208 }
2209
2210 /* The idea here is that we need to get four locks in the end:
2211  * one on each parent directory, one on each child.  We need to take
2212  * these locks in some kind of order (to avoid deadlocks), and the order
2213  * I selected is "increasing resource number" order.  We need to look up
2214  * the children, however, before we know what the resource number(s) are.
2215  * Thus the following plan:
2216  *
2217  * 1,2. Look up the parents
2218  * 3,4. Look up the children
2219  * 5. Take locks on the parents and children, in order
2220  * 6. Verify that the children haven't changed since they were looked up
2221  *
2222  * If there was a race and the children changed since they were first looked
2223  * up, it is possible that mds_verify_child() will be able to just grab the
2224  * lock on the new child resource (if it has a higher resource than any other)
2225  * but we need to compare against not only its parent, but also against the
2226  * parent and child of the "other half" of the rename, hence maxres_{src,tgt}.
2227  *
2228  * We need the fancy igrab() on the child inodes because we aren't holding a
2229  * lock on the parent after the lookup is done, so dentry->d_inode may change
2230  * at any time, and igrab() itself doesn't like getting passed a NULL argument.
2231  */
2232 static int mds_get_parents_children_locked(struct obd_device *obd,
2233                                            struct mds_obd *mds,
2234                                            struct ll_fid *p1_fid,
2235                                            struct dentry **de_srcdirp,
2236                                            struct ll_fid *p2_fid,
2237                                            struct dentry **de_tgtdirp,
2238                                            int parent_mode,
2239                                            const char *old_name, int old_len,
2240                                            struct dentry **de_oldp,
2241                                            const char *new_name, int new_len,
2242                                            struct dentry **de_newp,
2243                                            struct lustre_handle *dlm_handles,
2244                                            int child_mode)
2245 {
2246         struct ldlm_res_id p1_res_id = { .name = {0} };
2247         struct ldlm_res_id p2_res_id = { .name = {0} };
2248         struct ldlm_res_id c1_res_id = { .name = {0} };
2249         struct ldlm_res_id c2_res_id = { .name = {0} };
2250         ldlm_policy_data_t p_policy = {.l_inodebits = {MDS_INODELOCK_UPDATE}};
2251         /* Only dentry should change, but the inode itself would be
2252            intact otherwise */
2253         ldlm_policy_data_t c1_policy = {.l_inodebits = {MDS_INODELOCK_LOOKUP}};
2254         /* If something is going to be replaced, both dentry and inode locks are
2255            needed */
2256         ldlm_policy_data_t c2_policy = {.l_inodebits = {MDS_INODELOCK_LOOKUP|
2257                                                         MDS_INODELOCK_UPDATE}};
2258         struct ldlm_res_id *maxres_src, *maxres_tgt;
2259         struct inode *inode;
2260         int rc = 0, cleanup_phase = 0;
2261         ENTRY;
2262
2263         /* Step 1: Lookup the source directory */
2264         *de_srcdirp = mds_fid2dentry(mds, p1_fid, NULL);
2265         if (IS_ERR(*de_srcdirp))
2266                 GOTO(cleanup, rc = PTR_ERR(*de_srcdirp));
2267
2268         cleanup_phase = 1; /* source directory dentry */
2269
2270         p1_res_id.name[0] = (*de_srcdirp)->d_inode->i_ino;
2271         p1_res_id.name[1] = (*de_srcdirp)->d_inode->i_generation;
2272
2273         /* Step 2: Lookup the target directory */
2274         if (memcmp(p1_fid, p2_fid, sizeof(*p1_fid)) == 0) {
2275                 *de_tgtdirp = dget(*de_srcdirp);
2276         } else {
2277                 *de_tgtdirp = mds_fid2dentry(mds, p2_fid, NULL);
2278                 if (IS_ERR(*de_tgtdirp)) {
2279                         rc = PTR_ERR(*de_tgtdirp);
2280                         *de_tgtdirp = NULL;
2281                         GOTO(cleanup, rc);
2282                 }
2283         }
2284
2285         cleanup_phase = 2; /* target directory dentry */
2286
2287         p2_res_id.name[0] = (*de_tgtdirp)->d_inode->i_ino;
2288         p2_res_id.name[1] = (*de_tgtdirp)->d_inode->i_generation;
2289
2290 #ifdef S_PDIROPS
2291         dlm_handles[5].cookie = 0;
2292         dlm_handles[6].cookie = 0;
2293         if (IS_PDIROPS((*de_srcdirp)->d_inode)) {
2294                 /* Get a temp lock on just ino, gen to flush client cache and
2295                  * to protect dirs from concurrent splitting */
2296                 rc = enqueue_ordered_locks(obd, &p1_res_id, &(dlm_handles[5]),
2297                                            LCK_PW, &p_policy, &p2_res_id,
2298                                            &(dlm_handles[6]),LCK_PW,&p_policy);
2299                 if (rc != ELDLM_OK)
2300                         GOTO(cleanup, rc);
2301
2302                 p1_res_id.name[2] = full_name_hash(old_name, old_len - 1);
2303                 p2_res_id.name[2] = full_name_hash(new_name, new_len - 1);
2304                 CDEBUG(D_INFO, "take locks on %lu:%u:"LPX64", %lu:%u:"LPX64"\n",
2305                        (*de_srcdirp)->d_inode->i_ino,
2306                        (*de_srcdirp)->d_inode->i_generation, p1_res_id.name[2],
2307                        (*de_tgtdirp)->d_inode->i_ino,
2308                        (*de_tgtdirp)->d_inode->i_generation, p2_res_id.name[2]);
2309         }
2310 #endif
2311
2312         /* Step 3: Lookup the source child entry */
2313         *de_oldp = ll_lookup_one_len(old_name, *de_srcdirp, old_len - 1);
2314         if (IS_ERR(*de_oldp)) {
2315                 rc = PTR_ERR(*de_oldp);
2316                 CERROR("old child lookup error (%*s): %d\n",
2317                        old_len - 1, old_name, rc);
2318                 GOTO(cleanup, rc);
2319         }
2320
2321         cleanup_phase = 3; /* original name dentry */
2322
2323         inode = (*de_oldp)->d_inode;
2324         if (inode != NULL) {
2325                 inode = igrab(inode);
2326                 if (inode == NULL)
2327                         GOTO(cleanup, rc = -ENOENT);
2328
2329                 c1_res_id.name[0] = inode->i_ino;
2330                 c1_res_id.name[1] = inode->i_generation;
2331                 iput(inode);
2332         } else if ((*de_oldp)->d_flags & DCACHE_CROSS_REF) {
2333                 c1_res_id.name[0] = (*de_oldp)->d_inum;
2334                 c1_res_id.name[1] = (*de_oldp)->d_generation;
2335         }
2336
2337         /* Step 4: Lookup the target child entry */
2338         *de_newp = ll_lookup_one_len(new_name, *de_tgtdirp, new_len - 1);
2339         if (IS_ERR(*de_newp)) {
2340                 rc = PTR_ERR(*de_newp);
2341                 CERROR("new child lookup error (%*s): %d\n",
2342                        old_len - 1, old_name, rc);
2343                 GOTO(cleanup, rc);
2344         }
2345
2346         cleanup_phase = 4; /* target dentry */
2347
2348         inode = (*de_newp)->d_inode;
2349         if (inode != NULL) {
2350                 inode = igrab(inode);
2351                 if (inode == NULL)
2352                         goto retry_locks;
2353
2354                 c2_res_id.name[0] = inode->i_ino;
2355                 c2_res_id.name[1] = inode->i_generation;
2356                 iput(inode);
2357         } else if ((*de_newp)->d_flags & DCACHE_CROSS_REF) {
2358                 c2_res_id.name[0] = (*de_newp)->d_inum;
2359                 c2_res_id.name[1] = (*de_newp)->d_generation;
2360         }
2361
2362 retry_locks:
2363         /* Step 5: Take locks on the parents and child(ren) */
2364         maxres_src = &p1_res_id;
2365         maxres_tgt = &p2_res_id;
2366         cleanup_phase = 4; /* target dentry */
2367
2368         if (c1_res_id.name[0] != 0 && res_gt(&c1_res_id, &p1_res_id, NULL,NULL))
2369                 maxres_src = &c1_res_id;
2370         if (c2_res_id.name[0] != 0 && res_gt(&c2_res_id, &p2_res_id, NULL,NULL))
2371                 maxres_tgt = &c2_res_id;
2372
2373         rc = enqueue_4ordered_locks(obd, &p1_res_id,&dlm_handles[0],parent_mode,
2374                                     &p_policy,
2375                                     &p2_res_id, &dlm_handles[1], parent_mode,
2376                                     &p_policy,
2377                                     &c1_res_id, &dlm_handles[2], child_mode,
2378                                     &c1_policy,
2379                                     &c2_res_id, &dlm_handles[3], child_mode,
2380                                     &c2_policy);
2381         if (rc)
2382                 GOTO(cleanup, rc);
2383
2384         cleanup_phase = 6; /* parent and child(ren) locks */
2385
2386         /* Step 6a: Re-lookup source child to verify it hasn't changed */
2387         rc = mds_verify_child(obd, &p1_res_id, &dlm_handles[0], *de_srcdirp,
2388                               parent_mode, &c1_res_id, &dlm_handles[2],
2389                               de_oldp, child_mode, &c1_policy, old_name,old_len,
2390                               maxres_tgt);
2391         if (rc) {
2392                 if (c2_res_id.name[0] != 0)
2393                         ldlm_lock_decref(&dlm_handles[3], child_mode);
2394                 ldlm_lock_decref(&dlm_handles[1], parent_mode);
2395                 cleanup_phase = 4;
2396                 if (rc > 0)
2397                         goto retry_locks;
2398                 GOTO(cleanup, rc);
2399         }
2400
2401         if (!DENTRY_VALID(*de_oldp))
2402                 GOTO(cleanup, rc = -ENOENT);
2403
2404         /* Step 6b: Re-lookup target child to verify it hasn't changed */
2405         rc = mds_verify_child(obd, &p2_res_id, &dlm_handles[1], *de_tgtdirp,
2406                               parent_mode, &c2_res_id, &dlm_handles[3],
2407                               de_newp, child_mode, &c2_policy, new_name,
2408                               new_len, maxres_src);
2409         if (rc) {
2410                 ldlm_lock_decref(&dlm_handles[2], child_mode);
2411                 ldlm_lock_decref(&dlm_handles[0], parent_mode);
2412                 cleanup_phase = 4;
2413                 if (rc > 0)
2414                         goto retry_locks;
2415                 GOTO(cleanup, rc);
2416         }
2417
2418         EXIT;
2419 cleanup:
2420         if (rc) {
2421                 switch (cleanup_phase) {
2422                 case 6: /* child lock(s) */
2423                         if (c2_res_id.name[0] != 0)
2424                                 ldlm_lock_decref(&dlm_handles[3], child_mode);
2425                         if (c1_res_id.name[0] != 0)
2426                                 ldlm_lock_decref(&dlm_handles[2], child_mode);
2427                 case 5: /* parent locks */
2428                         ldlm_lock_decref(&dlm_handles[1], parent_mode);
2429                         ldlm_lock_decref(&dlm_handles[0], parent_mode);
2430                 case 4: /* target dentry */
2431                         l_dput(*de_newp);
2432                 case 3: /* source dentry */
2433                         l_dput(*de_oldp);
2434                 case 2: /* target directory dentry */
2435                         l_dput(*de_tgtdirp);
2436                 case 1: /* source directry dentry */
2437                         l_dput(*de_srcdirp);
2438                 }
2439         }
2440
2441         return rc;
2442 }
2443
2444 static int mds_reint_rename_create_name(struct mds_update_record *rec,
2445                                         int offset, struct ptlrpc_request *req)
2446 {
2447         struct obd_device *obd = req->rq_export->exp_obd;
2448         struct dentry *de_srcdir = NULL;
2449         struct dentry *de_new = NULL;
2450         struct mds_obd *mds = mds_req2mds(req);
2451         struct lustre_handle parent_lockh[2] = {{0}, {0}};
2452         struct lustre_handle child_lockh = {0};
2453         int cleanup_phase = 0;
2454         void *handle = NULL;
2455         int update_mode, rc = 0;
2456         ENTRY;
2457
2458         /* another MDS executing rename operation has asked us
2459          * to create target name. such a creation should destroy
2460          * existing target name */
2461
2462         CDEBUG(D_OTHER, "%s: request to create name %s for %lu/%lu/%lu\n",
2463                         obd->obd_name, rec->ur_tgt,
2464                         (unsigned long) rec->ur_fid1->mds,
2465                         (unsigned long) rec->ur_fid1->id,
2466                         (unsigned long) rec->ur_fid1->generation);
2467
2468         /* first, lookup the target */
2469         child_lockh.cookie = 0;
2470         rc = mds_get_parent_child_locked(obd, mds, rec->ur_fid2, parent_lockh,
2471                                          &de_srcdir,LCK_PW,MDS_INODELOCK_UPDATE,
2472                                          &update_mode, rec->ur_tgt, rec->ur_tgtlen,
2473                                          &child_lockh, &de_new, LCK_EX,
2474                                          MDS_INODELOCK_LOOKUP);
2475         if (rc)
2476                 GOTO(cleanup, rc);
2477
2478         cleanup_phase = 1;
2479
2480         LASSERT(de_srcdir);
2481         LASSERT(de_srcdir->d_inode);
2482         LASSERT(de_new);
2483
2484         if (de_new->d_inode) {
2485                 /* name exists and points to local inode
2486                  * try to unlink this name and create new one */
2487                 CERROR("%s: %s points to local inode %lu/%lu\n",
2488                        obd->obd_name, rec->ur_tgt,
2489                        (unsigned long) de_new->d_inode->i_ino,
2490                        (unsigned long) de_new->d_inode->i_generation);
2491                 handle = fsfilt_start(obd, de_srcdir->d_inode,
2492                                       FSFILT_OP_RENAME, NULL);
2493                 if (IS_ERR(handle))
2494                         GOTO(cleanup, rc = PTR_ERR(handle));
2495                 rc = fsfilt_del_dir_entry(req->rq_export->exp_obd, de_new);
2496                 if (rc)
2497                         GOTO(cleanup, rc);
2498         } else if (de_new->d_flags & DCACHE_CROSS_REF) {
2499                 /* name exists adn points to remove inode */
2500                 CERROR("%s: %s points to remote inode %lu/%lu/%lu\n",
2501                        obd->obd_name, rec->ur_tgt,
2502                        (unsigned long) de_new->d_mdsnum,
2503                        (unsigned long) de_new->d_inum,
2504                        (unsigned long) de_new->d_generation);
2505         } else {
2506                 /* name doesn't exist. the simplest case */
2507                 handle = fsfilt_start(obd, de_srcdir->d_inode,
2508                                       FSFILT_OP_LINK, NULL);
2509                 if (IS_ERR(handle))
2510                         GOTO(cleanup, rc = PTR_ERR(handle));
2511         }
2512
2513         cleanup_phase = 2;
2514         rc = fsfilt_add_dir_entry(obd, de_srcdir, rec->ur_tgt,
2515                         rec->ur_tgtlen - 1, rec->ur_fid1->id,
2516                         rec->ur_fid1->generation, rec->ur_fid1->mds);
2517         if (rc)
2518                 CERROR("add_dir_entry() returned error %d\n", rc);
2519 cleanup:
2520         EXIT;
2521         rc = mds_finish_transno(mds, de_srcdir ? de_srcdir->d_inode : NULL,
2522                                 handle, req, rc, 0);
2523         switch(cleanup_phase) {
2524                 case 2:
2525                 case 1:
2526 #ifdef S_PDIROPS
2527                         if (parent_lockh[1].cookie != 0)
2528                                 ldlm_lock_decref(&parent_lockh[1], update_mode);
2529 #endif
2530                         ldlm_lock_decref(&parent_lockh[0], LCK_PW);
2531                         if (child_lockh.cookie != 0)
2532                                 ldlm_lock_decref(&child_lockh, LCK_EX);
2533                         l_dput(de_new);
2534                         l_dput(de_srcdir);
2535                         break;
2536                 default:
2537                         LBUG();
2538         }
2539
2540         req->rq_status = rc;
2541
2542         RETURN(0);
2543 }
2544
2545 static int mds_reint_rename_to_remote(struct mds_update_record *rec, int offset,
2546                                       struct ptlrpc_request *req)
2547 {
2548         struct obd_device *obd = req->rq_export->exp_obd;
2549         struct ptlrpc_request *req2 = NULL;
2550         struct dentry *de_srcdir = NULL;
2551         struct dentry *de_old = NULL;
2552         struct mds_obd *mds = mds_req2mds(req);
2553         struct lustre_handle parent_lockh[2] = {{0}, {0}};
2554         struct lustre_handle child_lockh = {0};
2555         struct mdc_op_data opdata;
2556         void *handle = NULL;
2557         int update_mode, rc = 0;
2558         ENTRY;
2559
2560         CDEBUG(D_OTHER, "%s: move name %s onto another mds%u\n",
2561                obd->obd_name, rec->ur_name, rec->ur_fid2->mds + 1);
2562         memset(&opdata, 0, sizeof(opdata));
2563
2564         child_lockh.cookie = 0;
2565         rc = mds_get_parent_child_locked(obd, mds, rec->ur_fid1, parent_lockh,
2566                                          &de_srcdir,LCK_PW,MDS_INODELOCK_UPDATE,
2567                                          &update_mode, rec->ur_name,
2568                                          rec->ur_namelen, &child_lockh, &de_old,
2569                                          LCK_EX, MDS_INODELOCK_LOOKUP);
2570         LASSERT(rc == 0);
2571         LASSERT(de_srcdir);
2572         LASSERT(de_srcdir->d_inode);
2573         LASSERT(de_old);
2574
2575         /* we already know the target should be created on another MDS
2576          * so, we have to request that MDS to do it */
2577
2578         /* prepare source fid */
2579         if (de_old->d_flags & DCACHE_CROSS_REF) {
2580                 LASSERT(de_old->d_inode == NULL);
2581                 CDEBUG(D_OTHER, "request to move remote name\n");
2582                 opdata.fid1.mds = de_old->d_mdsnum;
2583                 opdata.fid1.id = de_old->d_inum;
2584                 opdata.fid1.generation = de_old->d_generation;
2585         } else if (de_old->d_inode == NULL) {
2586                 /* oh, source doesn't exist */
2587                 GOTO(cleanup, rc = -ENOENT);
2588         } else {
2589                 LASSERT(de_old->d_inode != NULL);
2590                 CDEBUG(D_OTHER, "request to move local name\n");
2591                 opdata.fid1.mds = mds->mds_num;
2592                 opdata.fid1.id = de_old->d_inode->i_ino;
2593                 opdata.fid1.generation = de_old->d_inode->i_generation;
2594         }
2595
2596         opdata.fid2 = *(rec->ur_fid2);
2597         rc = md_rename(mds->mds_lmv_exp, &opdata, NULL, 0, rec->ur_tgt,
2598                        rec->ur_tgtlen - 1, &req2);
2599
2600         if (rc)
2601                 GOTO(cleanup, rc);
2602
2603         handle = fsfilt_start(obd, de_srcdir->d_inode, FSFILT_OP_UNLINK, NULL);
2604         if (IS_ERR(handle))
2605                 GOTO(cleanup, rc = PTR_ERR(handle));
2606         rc = fsfilt_del_dir_entry(obd, de_old);
2607         d_drop(de_old);
2608
2609 cleanup:
2610         EXIT;
2611         rc = mds_finish_transno(mds, de_srcdir ? de_srcdir->d_inode : NULL,
2612                                 handle, req, rc, 0);
2613         if (req2)
2614                 ptlrpc_req_finished(req2);
2615
2616 #ifdef S_PDIROPS
2617         if (parent_lockh[1].cookie != 0)
2618                 ldlm_lock_decref(&parent_lockh[1], update_mode);
2619 #endif
2620         ldlm_lock_decref(&parent_lockh[0], LCK_PW);
2621         if (child_lockh.cookie != 0)
2622                 ldlm_lock_decref(&child_lockh, LCK_EX);
2623
2624         l_dput(de_old);
2625         l_dput(de_srcdir);
2626
2627         req->rq_status = rc;
2628         RETURN(0);
2629
2630 }
2631
2632 static int mds_reint_rename(struct mds_update_record *rec, int offset,
2633                             struct ptlrpc_request *req,
2634                             struct lustre_handle *lockh)
2635 {
2636         struct obd_device *obd = req->rq_export->exp_obd;
2637         struct dentry *de_srcdir = NULL;
2638         struct dentry *de_tgtdir = NULL;
2639         struct dentry *de_old = NULL;
2640         struct dentry *de_new = NULL;
2641         struct mds_obd *mds = mds_req2mds(req);
2642         struct lustre_handle dlm_handles[7] = {{0},{0},{0},{0},{0},{0},{0}};
2643         struct mds_body *body = NULL;
2644         int rc = 0, lock_count = 3;
2645         int cleanup_phase = 0;
2646         void *handle = NULL;
2647         ENTRY;
2648
2649         LASSERT(offset == 0);
2650
2651         DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u %s to "LPU64"/%u %s",
2652                   rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_name,
2653                   rec->ur_fid2->id, rec->ur_fid2->generation, rec->ur_tgt);
2654
2655         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
2656
2657         if (rec->ur_namelen == 1) {
2658                 rc = mds_reint_rename_create_name(rec, offset, req);
2659                 RETURN(rc);
2660         }
2661
2662         if (rec->ur_fid2->mds != mds->mds_num) {
2663                 rc = mds_reint_rename_to_remote(rec, offset, req);
2664                 RETURN(rc);
2665         }
2666
2667         rc = mds_get_parents_children_locked(obd, mds, rec->ur_fid1, &de_srcdir,
2668                                              rec->ur_fid2, &de_tgtdir, LCK_PW,
2669                                              rec->ur_name, rec->ur_namelen,
2670                                              &de_old, rec->ur_tgt,
2671                                              rec->ur_tgtlen, &de_new,
2672                                              dlm_handles, LCK_EX);
2673         if (rc)
2674                 GOTO(cleanup, rc);
2675
2676         cleanup_phase = 1; /* parent(s), children, locks */
2677
2678         if (de_new->d_inode)
2679                 lock_count = 4;
2680
2681         /* sanity check for src inode */
2682         if (de_old->d_inode->i_ino == de_srcdir->d_inode->i_ino ||
2683             de_old->d_inode->i_ino == de_tgtdir->d_inode->i_ino)
2684                 GOTO(cleanup, rc = -EINVAL);
2685
2686         /* sanity check for dest inode */
2687         if (de_new->d_inode &&
2688             (de_new->d_inode->i_ino == de_srcdir->d_inode->i_ino ||
2689              de_new->d_inode->i_ino == de_tgtdir->d_inode->i_ino))
2690                 GOTO(cleanup, rc = -EINVAL);
2691
2692         if (de_old->d_inode == de_new->d_inode)
2693                 GOTO(cleanup, rc = 0);
2694
2695         /* if we are about to remove the target at first, pass the EA of
2696          * that inode to client to perform and cleanup on OST */
2697         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
2698         LASSERT(body != NULL);
2699
2700         if (de_new->d_inode &&
2701             S_ISREG(de_new->d_inode->i_mode) &&
2702             de_new->d_inode->i_nlink == 1 &&
2703             mds_open_orphan_count(de_new->d_inode) == 0) {
2704                 mds_pack_inode2fid(obd, &body->fid1, de_new->d_inode);
2705                 mds_pack_inode2body(obd, body, de_new->d_inode);
2706                 mds_pack_md(obd, req->rq_repmsg, 1, body, de_new->d_inode, 1);
2707                 if (!(body->valid & OBD_MD_FLEASIZE)) {
2708                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
2709                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
2710                 } else {
2711                         /* XXX need log unlink? */
2712                 }
2713         }
2714
2715         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_RENAME_WRITE,
2716                        de_srcdir->d_inode->i_sb);
2717
2718         handle = fsfilt_start(obd, de_tgtdir->d_inode, FSFILT_OP_RENAME, NULL);
2719         if (IS_ERR(handle))
2720                 GOTO(cleanup, rc = PTR_ERR(handle));
2721
2722         /* FIXME need adjust the journal block count? */
2723         /* if the target should be moved to PENDING, we at first increase the
2724          * link and later vfs_rename() will decrease the link count again */
2725         if (de_new->d_inode &&
2726             S_ISREG(de_new->d_inode->i_mode) &&
2727             de_new->d_inode->i_nlink == 1 &&
2728             mds_open_orphan_count(de_new->d_inode) > 0) {
2729                 rc = mds_add_link_orphan(rec, obd, de_new);
2730                 if (rc)
2731                         GOTO(cleanup, rc);
2732         }
2733
2734         lock_kernel();
2735         de_old->d_fsdata = req;
2736         de_new->d_fsdata = req;
2737         rc = vfs_rename(de_srcdir->d_inode, de_old, de_tgtdir->d_inode, de_new);
2738         unlock_kernel();
2739
2740         GOTO(cleanup, rc);
2741 cleanup:
2742         rc = mds_finish_transno(mds, de_tgtdir ? de_tgtdir->d_inode : NULL,
2743                                 handle, req, rc, 0);
2744         switch (cleanup_phase) {
2745         case 1:
2746 #ifdef S_PDIROPS
2747                 if (dlm_handles[5].cookie != 0)
2748                         ldlm_lock_decref(&(dlm_handles[5]), LCK_PW);
2749                 if (dlm_handles[6].cookie != 0)
2750                         ldlm_lock_decref(&(dlm_handles[6]), LCK_PW);
2751 #endif
2752                 if (rc) {
2753                         if (lock_count == 4)
2754                                 ldlm_lock_decref(&(dlm_handles[3]), LCK_EX);
2755                         ldlm_lock_decref(&(dlm_handles[2]), LCK_EX);
2756                         ldlm_lock_decref(&(dlm_handles[1]), LCK_PW);
2757                         ldlm_lock_decref(&(dlm_handles[0]), LCK_PW);
2758                 } else {
2759                         if (lock_count == 4)
2760                                 ptlrpc_save_lock(req,&(dlm_handles[3]), LCK_EX);
2761                         ptlrpc_save_lock(req, &(dlm_handles[2]), LCK_EX);
2762                         ptlrpc_save_lock(req, &(dlm_handles[1]), LCK_PW);
2763                         ptlrpc_save_lock(req, &(dlm_handles[0]), LCK_PW);
2764                 }
2765                 l_dput(de_new);
2766                 l_dput(de_old);
2767                 l_dput(de_tgtdir);
2768                 l_dput(de_srcdir);
2769         case 0:
2770                 break;
2771         default:
2772                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
2773                 LBUG();
2774         }
2775         req->rq_status = rc;
2776         return 0;
2777 }
2778
2779 typedef int (*mds_reinter)(struct mds_update_record *, int offset,
2780                            struct ptlrpc_request *, struct lustre_handle *);
2781
2782 static mds_reinter reinters[REINT_MAX + 1] = {
2783         [REINT_SETATTR] mds_reint_setattr,
2784         [REINT_CREATE] mds_reint_create,
2785         [REINT_LINK] mds_reint_link,
2786         [REINT_UNLINK] mds_reint_unlink,
2787         [REINT_RENAME] mds_reint_rename,
2788         [REINT_OPEN] mds_open
2789 };
2790
2791 int mds_reint_rec(struct mds_update_record *rec, int offset,
2792                   struct ptlrpc_request *req, struct lustre_handle *lockh)
2793 {
2794         struct obd_device *obd = req->rq_export->exp_obd;
2795         struct lvfs_run_ctxt saved;
2796         int rc;
2797
2798         /* checked by unpacker */
2799         LASSERT(rec->ur_opcode <= REINT_MAX &&
2800                 reinters[rec->ur_opcode] != NULL);
2801
2802         push_ctxt(&saved, &obd->obd_lvfs_ctxt, &rec->ur_uc);
2803         rc = reinters[rec->ur_opcode] (rec, offset, req, lockh);
2804         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, &rec->ur_uc);
2805
2806         return rc;
2807 }