lustre/mds/mds_reint.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  linux/mds/mds_reint.c
   5  *  Lustre Metadata Server (mds) reintegration routines
   6  *
   7  *  Copyright (C) 2002, 2003 Cluster File Systems, Inc.
   8  *   Author: Peter Braam <braam@clusterfs.com>
   9  *   Author: Andreas Dilger <adilger@clusterfs.com>
  10  *   Author: Phil Schwan <phil@clusterfs.com>
  11  *
  12  *   This file is part of Lustre, http://www.lustre.org.
  13  *
  14  *   Lustre is free software; you can redistribute it and/or
  15  *   modify it under the terms of version 2 of the GNU General Public
  16  *   License as published by the Free Software Foundation.
  17  *
  18  *   Lustre is distributed in the hope that it will be useful,
  19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *   GNU General Public License for more details.
  22  *
  23  *   You should have received a copy of the GNU General Public License
  24  *   along with Lustre; if not, write to the Free Software
  25  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #ifndef EXPORT_SYMTAB
  29 # define EXPORT_SYMTAB
  30 #endif
  31 #define DEBUG_SUBSYSTEM S_MDS
  32
  33 #include <linux/fs.h>
  34 #include <linux/obd_support.h>
  35 #include <linux/obd_class.h>
  36 #include <linux/obd.h>
  37 #include <linux/lustre_lib.h>
  38 #include <linux/lustre_idl.h>
  39 #include <linux/lustre_mds.h>
  40 #include <linux/lustre_dlm.h>
  41 #include <linux/lustre_fsfilt.h>
  42
  43 #include "mds_internal.h"
  44
  45 void mds_commit_cb(struct obd_device *obd, __u64 transno, void *data,
  46                    int error)
  47 {
  48         obd_transno_commit_cb(obd, transno, error);
  49 }
  50
  51 struct mds_logcancel_data {
  52         struct lov_mds_md      *mlcd_lmm;
  53         int                     mlcd_size;
  54         int                     mlcd_cookielen;
  55         int                     mlcd_eadatalen;
  56         struct llog_cookie      mlcd_cookies[0];
  57 };
  58
  59
  60 static void mds_cancel_cookies_cb(struct obd_device *obd, __u64 transno,
  61                                   void *cb_data, int error)
  62 {
  63         struct mds_logcancel_data *mlcd = cb_data;
  64         struct lov_stripe_md *lsm = NULL;
  65         struct llog_ctxt *ctxt;
  66         int rc;
  67
  68         obd_transno_commit_cb(obd, transno, error);
  69
  70         CDEBUG(D_HA, "cancelling %d cookies\n",
  71                (int)(mlcd->mlcd_cookielen / sizeof(*mlcd->mlcd_cookies)));
  72
  73         rc = obd_unpackmd(obd->u.mds.mds_osc_exp, &lsm, mlcd->mlcd_lmm,
  74                           mlcd->mlcd_eadatalen);
  75         if (rc < 0) {
  76                 CERROR("bad LSM cancelling %d log cookies: rc %d\n",
  77                        (int)(mlcd->mlcd_cookielen/sizeof(*mlcd->mlcd_cookies)),
  78                        rc);
  79         } else {
  80                 ///* XXX 0 normally, SENDNOW for debug */);
  81                 ctxt = llog_get_context(obd,mlcd->mlcd_cookies[0].lgc_subsys+1);
  82                 rc = llog_cancel(ctxt, lsm, mlcd->mlcd_cookielen /
  83                                                 sizeof(*mlcd->mlcd_cookies),
  84                                  mlcd->mlcd_cookies, OBD_LLOG_FL_SENDNOW);
  85                 if (rc)
  86                         CERROR("error cancelling %d log cookies: rc %d\n",
  87                                (int)(mlcd->mlcd_cookielen /
  88                                      sizeof(*mlcd->mlcd_cookies)), rc);
  89         }
  90
  91         OBD_FREE(mlcd, mlcd->mlcd_size);
  92 }
  93
  94 /* Assumes caller has already pushed us into the kernel context. */
  95 int mds_finish_transno(struct mds_obd *mds, struct inode *inode, void *handle,
  96                        struct ptlrpc_request *req, int rc, __u32 op_data)
  97 {
  98         struct mds_export_data *med = &req->rq_export->exp_mds_data;
  99         struct mds_client_data *mcd = med->med_mcd;
 100         struct obd_device *obd = req->rq_export->exp_obd;
 101         int err;
 102         __u64 transno;
 103         loff_t off;
 104         int log_pri = D_HA;
 105         ENTRY;
 106
 107         /* if the export has already been failed, we have no last_rcvd slot */
 108         if (req->rq_export->exp_failed) {
 109                 CWARN("committing transaction for disconnected client %s\n",
 110                       req->rq_export->exp_client_uuid.uuid);
 111                 if (handle)
 112                         GOTO(commit, rc);
 113                 RETURN(rc);
 114         }
 115
 116         if (IS_ERR(handle))
 117                 RETURN(rc);
 118
 119         if (handle == NULL) {
 120                 /* if we're starting our own xaction, use our own inode */
 121                 inode = mds->mds_rcvd_filp->f_dentry->d_inode;
 122                 handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
 123                 if (IS_ERR(handle)) {
 124                         CERROR("fsfilt_start: %ld\n", PTR_ERR(handle));
 125                         RETURN(PTR_ERR(handle));
 126                 }
 127         }
 128
 129         off = med->med_off;
 130
 131         transno = req->rq_reqmsg->transno;
 132         if (rc != 0) {
 133                 LASSERT(transno == 0);
 134         } else if (transno == 0) {
 135                 spin_lock(&mds->mds_transno_lock);
 136                 transno = ++mds->mds_last_transno;
 137                 spin_unlock(&mds->mds_transno_lock);
 138         } else {
 139                 spin_lock(&mds->mds_transno_lock);
 140                 if (transno > mds->mds_last_transno)
 141                         mds->mds_last_transno = transno;
 142                 spin_unlock(&mds->mds_transno_lock);
 143         }
 144         req->rq_repmsg->transno = req->rq_transno = transno;
 145         mcd->mcd_last_transno = cpu_to_le64(transno);
 146         mcd->mcd_last_xid = cpu_to_le64(req->rq_xid);
 147         mcd->mcd_last_result = cpu_to_le32(rc);
 148         mcd->mcd_last_data = cpu_to_le32(op_data);
 149
 150         fsfilt_add_journal_cb(req->rq_export->exp_obd, transno, handle,
 151                               mds_commit_cb, NULL);
 152         err = fsfilt_write_record(obd, mds->mds_rcvd_filp, mcd, sizeof(*mcd),
 153                                   &off, 0);
 154
 155         if (err) {
 156                 log_pri = D_ERROR;
 157                 if (rc == 0)
 158                         rc = err;
 159         }
 160
 161         DEBUG_REQ(log_pri, req,
 162                   "wrote trans #"LPU64" rc %d client %s at idx %u: err = %d",
 163                   transno, rc, mcd->mcd_uuid, med->med_idx, err);
 164
 165         err = mds_lov_write_objids(obd);
 166         if (err) {
 167                 log_pri = D_ERROR;
 168                 if (rc == 0)
 169                         rc = err;
 170         }
 171         CDEBUG(log_pri, "wrote objids: err = %d\n", err);
 172
 173 commit:
 174         err = fsfilt_commit(obd, inode, handle, 0);
 175         if (err) {
 176                 CERROR("error committing transaction: %d\n", err);
 177                 if (!rc)
 178                         rc = err;
 179         }
 180
 181         RETURN(rc);
 182 }
 183
 184 /* this gives the same functionality as the code between
 185  * sys_chmod and inode_setattr
 186  * chown_common and inode_setattr
 187  * utimes and inode_setattr
 188  */
 189 int mds_fix_attr(struct inode *inode, struct mds_update_record *rec)
 190 {
 191         time_t now = CURRENT_SECONDS;
 192         struct iattr *attr = &rec->ur_iattr;
 193         unsigned int ia_valid = attr->ia_valid;
 194         int error;
 195         ENTRY;
 196
 197         /* only fix up attrs if the client VFS didn't already */
 198         if (!(ia_valid & ATTR_RAW))
 199                 RETURN(0);
 200
 201         if (!(ia_valid & ATTR_CTIME_SET))
 202                 LTIME_S(attr->ia_ctime) = now;
 203         if (!(ia_valid & ATTR_ATIME_SET))
 204                 LTIME_S(attr->ia_atime) = now;
 205         if (!(ia_valid & ATTR_MTIME_SET))
 206                 LTIME_S(attr->ia_mtime) = now;
 207
 208         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 209                 RETURN(-EPERM);
 210
 211         /* times */
 212         if ((ia_valid & (ATTR_MTIME|ATTR_ATIME)) == (ATTR_MTIME|ATTR_ATIME)) {
 213                 if (rec->ur_fsuid != inode->i_uid &&
 214                     (error = ll_permission(inode, MAY_WRITE, NULL)) != 0)
 215                         RETURN(error);
 216         }
 217
 218         if (ia_valid & ATTR_SIZE) {
 219                 if ((error = ll_permission(inode, MAY_WRITE, NULL)) != 0)
 220                         RETURN(error);
 221         }
 222
 223         if (ia_valid & ATTR_UID) {
 224                 /* chown */
 225                 error = -EPERM;
 226                 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 227                         RETURN(-EPERM);
 228                 if (attr->ia_uid == (uid_t) -1)
 229                         attr->ia_uid = inode->i_uid;
 230                 if (attr->ia_gid == (gid_t) -1)
 231                         attr->ia_gid = inode->i_gid;
 232                 attr->ia_mode = inode->i_mode;
 233                 /*
 234                  * If the user or group of a non-directory has been
 235                  * changed by a non-root user, remove the setuid bit.
 236                  * 19981026 David C Niemi <niemi@tux.org>
 237                  *
 238                  * Changed this to apply to all users, including root,
 239                  * to avoid some races. This is the behavior we had in
 240                  * 2.0. The check for non-root was definitely wrong
 241                  * for 2.2 anyway, as it should have been using
 242                  * CAP_FSETID rather than fsuid -- 19990830 SD.
 243                  */
 244                 if ((inode->i_mode & S_ISUID) == S_ISUID &&
 245                     !S_ISDIR(inode->i_mode)) {
 246                         attr->ia_mode &= ~S_ISUID;
 247                         attr->ia_valid |= ATTR_MODE;
 248                 }
 249                 /*
 250                  * Likewise, if the user or group of a non-directory
 251                  * has been changed by a non-root user, remove the
 252                  * setgid bit UNLESS there is no group execute bit
 253                  * (this would be a file marked for mandatory
 254                  * locking).  19981026 David C Niemi <niemi@tux.org>
 255                  *
 256                  * Removed the fsuid check (see the comment above) --
 257                  * 19990830 SD.
 258                  */
 259                 if (((inode->i_mode & (S_ISGID | S_IXGRP)) ==
 260                      (S_ISGID | S_IXGRP)) && !S_ISDIR(inode->i_mode)) {
 261                         attr->ia_mode &= ~S_ISGID;
 262                         attr->ia_valid |= ATTR_MODE;
 263                 }
 264         } else if (ia_valid & ATTR_MODE) {
 265                 int mode = attr->ia_mode;
 266                 /* chmod */
 267                 if (attr->ia_mode == (mode_t) -1)
 268                         mode = inode->i_mode;
 269                 attr->ia_mode =
 270                         (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
 271         }
 272         RETURN(0);
 273 }
 274
 275 void mds_steal_ack_locks(struct ptlrpc_request *req)
 276 {
 277         struct obd_export         *exp = req->rq_export;
 278         struct list_head          *tmp;
 279         struct ptlrpc_reply_state *oldrep;
 280         struct ptlrpc_service     *svc;
 281         unsigned long              flags;
 282         char                       str[PTL_NALFMT_SIZE];
 283         int                        i;
 284
 285         /* CAVEAT EMPTOR: spinlock order */
 286         spin_lock_irqsave (&exp->exp_lock, flags);
 287         list_for_each (tmp, &exp->exp_outstanding_replies) {
 288                 oldrep = list_entry(tmp, struct ptlrpc_reply_state,rs_exp_list);
 289
 290                 if (oldrep->rs_xid != req->rq_xid)
 291                         continue;
 292
 293                 if (oldrep->rs_msg.opc != req->rq_reqmsg->opc)
 294                         CERROR ("Resent req xid "LPX64" has mismatched opc: "
 295                                 "new %d old %d\n", req->rq_xid,
 296                                 req->rq_reqmsg->opc, oldrep->rs_msg.opc);
 297
 298                 svc = oldrep->rs_srv_ni->sni_service;
 299                 spin_lock (&svc->srv_lock);
 300
 301                 list_del_init (&oldrep->rs_exp_list);
 302
 303                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
 304                       " o%d NID %s\n",
 305                       oldrep->rs_nlocks, oldrep,
 306                       oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_msg.opc,
 307                       ptlrpc_peernid2str(&exp->exp_connection->c_peer, str));
 308
 309                 for (i = 0; i < oldrep->rs_nlocks; i++)
 310                         ptlrpc_save_lock(req,
 311                                          &oldrep->rs_locks[i],
 312                                          oldrep->rs_modes[i]);
 313                 oldrep->rs_nlocks = 0;
 314
 315                 DEBUG_REQ(D_HA, req, "stole locks for");
 316                 ptlrpc_schedule_difficult_reply (oldrep);
 317
 318                 spin_unlock (&svc->srv_lock);
 319                 spin_unlock_irqrestore (&exp->exp_lock, flags);
 320                 return;
 321         }
 322         spin_unlock_irqrestore (&exp->exp_lock, flags);
 323 }
 324
 325 void mds_req_from_mcd(struct ptlrpc_request *req, struct mds_client_data *mcd)
 326 {
 327         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
 328                   mcd->mcd_last_transno, mcd->mcd_last_result);
 329         req->rq_repmsg->transno = req->rq_transno = mcd->mcd_last_transno;
 330         req->rq_repmsg->status = req->rq_status = mcd->mcd_last_result;
 331
 332         mds_steal_ack_locks(req);
 333 }
 334
 335 static void reconstruct_reint_setattr(struct mds_update_record *rec,
 336                                       int offset, struct ptlrpc_request *req)
 337 {
 338         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 339         struct mds_obd *obd = &req->rq_export->exp_obd->u.mds;
 340         struct dentry *de;
 341         struct mds_body *body;
 342
 343         mds_req_from_mcd(req, med->med_mcd);
 344
 345         de = mds_fid2dentry(obd, rec->ur_fid1, NULL);
 346         if (IS_ERR(de)) {
 347                 LASSERT(PTR_ERR(de) == req->rq_status);
 348                 return;
 349         }
 350
 351         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 352         mds_pack_inode2fid(&body->fid1, de->d_inode);
 353         mds_pack_inode2body(body, de->d_inode);
 354
 355         /* Don't return OST-specific attributes if we didn't just set them */
 356         if (rec->ur_iattr.ia_valid & ATTR_SIZE)
 357                 body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 358         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET))
 359                 body->valid |= OBD_MD_FLMTIME;
 360         if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET))
 361                 body->valid |= OBD_MD_FLATIME;
 362
 363         l_dput(de);
 364 }
 365
 366 /* In the raw-setattr case, we lock the child inode.
 367  * In the write-back case or if being called from open, the client holds a lock
 368  * already.
 369  *
 370  * We use the ATTR_FROM_OPEN flag to tell these cases apart. */
 371 static int mds_reint_setattr(struct mds_update_record *rec, int offset,
 372                              struct ptlrpc_request *req,
 373                              struct lustre_handle *lh)
 374 {
 375         struct mds_obd *mds = mds_req2mds(req);
 376         struct obd_device *obd = req->rq_export->exp_obd;
 377         struct mds_body *body;
 378         struct dentry *de;
 379         struct inode *inode = NULL;
 380         struct lustre_handle lockh;
 381         void *handle = NULL;
 382         struct mds_logcancel_data *mlcd = NULL;
 383         int rc = 0, cleanup_phase = 0, err, locked = 0;
 384         ENTRY;
 385
 386         LASSERT(offset == 0);
 387
 388         DEBUG_REQ(D_INODE, req, "setattr "LPU64"/%u %x", rec->ur_fid1->id,
 389                   rec->ur_fid1->generation, rec->ur_iattr.ia_valid);
 390
 391         MDS_CHECK_RESENT(req, reconstruct_reint_setattr(rec, offset, req));
 392
 393         if (rec->ur_iattr.ia_valid & ATTR_FROM_OPEN) {
 394                 de = mds_fid2dentry(mds, rec->ur_fid1, NULL);
 395                 if (IS_ERR(de))
 396                         GOTO(cleanup, rc = PTR_ERR(de));
 397         } else {
 398                 de = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL, LCK_PW,
 399                                            &lockh, NULL, 0);
 400                 if (IS_ERR(de))
 401                         GOTO(cleanup, rc = PTR_ERR(de));
 402                 locked = 1;
 403         }
 404
 405         cleanup_phase = 1;
 406         inode = de->d_inode;
 407         LASSERT(inode);
 408         if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 409             rec->ur_eadata != NULL)
 410                 down(&inode->i_sem);
 411
 412         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_SETATTR_WRITE, inode->i_sb);
 413
 414         handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
 415         if (IS_ERR(handle))
 416                 GOTO(cleanup, rc = PTR_ERR(handle));
 417
 418         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_CTIME))
 419                 CDEBUG(D_INODE, "setting mtime %lu, ctime %lu\n",
 420                        LTIME_S(rec->ur_iattr.ia_mtime),
 421                        LTIME_S(rec->ur_iattr.ia_ctime));
 422         rc = mds_fix_attr(inode, rec);
 423         if (rc)
 424                 GOTO(cleanup, rc);
 425
 426         if (rec->ur_iattr.ia_valid & ATTR_ATTR_FLAG)    /* ioctl */
 427                 rc = fsfilt_iocontrol(obd, inode, NULL, EXT3_IOC_SETFLAGS,
 428                                       (long)&rec->ur_iattr.ia_attr_flags);
 429         else                                            /* setattr */
 430                 rc = fsfilt_setattr(obd, de, handle, &rec->ur_iattr, 0);
 431
 432         if (rc == 0 && (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 433             rec->ur_eadata != NULL) {
 434                 struct lov_stripe_md *lsm = NULL;
 435
 436                 rc = ll_permission(inode, MAY_WRITE, NULL);
 437                 if (rc < 0)
 438                         GOTO(cleanup, rc);
 439
 440                 rc = obd_iocontrol(OBD_IOC_LOV_SETSTRIPE,
 441                                    mds->mds_osc_exp, 0, &lsm, rec->ur_eadata);
 442                 if (rc)
 443                         GOTO(cleanup, rc);
 444
 445                 obd_free_memmd(mds->mds_osc_exp, &lsm);
 446
 447                 rc = fsfilt_set_md(obd, inode, handle, rec->ur_eadata,
 448                                    rec->ur_eadatalen);
 449                 if (rc)
 450                         GOTO(cleanup, rc);
 451         }
 452
 453         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 454         mds_pack_inode2fid(&body->fid1, inode);
 455         mds_pack_inode2body(body, inode);
 456
 457         /* Don't return OST-specific attributes if we didn't just set them */
 458         if (rec->ur_iattr.ia_valid & ATTR_SIZE)
 459                 body->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 460         if (rec->ur_iattr.ia_valid & (ATTR_MTIME | ATTR_MTIME_SET))
 461                 body->valid |= OBD_MD_FLMTIME;
 462         if (rec->ur_iattr.ia_valid & (ATTR_ATIME | ATTR_ATIME_SET))
 463                 body->valid |= OBD_MD_FLATIME;
 464
 465         if (rc == 0 && rec->ur_cookielen && !IS_ERR(mds->mds_osc_obd)) {
 466                 OBD_ALLOC(mlcd, sizeof(*mlcd) + rec->ur_cookielen +
 467                           rec->ur_eadatalen);
 468                 if (mlcd) {
 469                         mlcd->mlcd_size = sizeof(*mlcd) + rec->ur_cookielen +
 470                                 rec->ur_eadatalen;
 471                         mlcd->mlcd_eadatalen = rec->ur_eadatalen;
 472                         mlcd->mlcd_cookielen = rec->ur_cookielen;
 473                         mlcd->mlcd_lmm = (void *)&mlcd->mlcd_cookies +
 474                                 mlcd->mlcd_cookielen;
 475                         memcpy(&mlcd->mlcd_cookies, rec->ur_logcookies,
 476                                mlcd->mlcd_cookielen);
 477                         memcpy(mlcd->mlcd_lmm, rec->ur_eadata,
 478                                mlcd->mlcd_eadatalen);
 479                 } else {
 480                         CERROR("unable to allocate log cancel data\n");
 481                 }
 482         }
 483         EXIT;
 484  cleanup:
 485         if (mlcd != NULL)
 486                 fsfilt_add_journal_cb(req->rq_export->exp_obd, 0, handle,
 487                                       mds_cancel_cookies_cb, mlcd);
 488         err = mds_finish_transno(mds, inode, handle, req, rc, 0);
 489         switch (cleanup_phase) {
 490         case 1:
 491                 if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) &&
 492                     rec->ur_eadata != NULL)
 493                         up(&inode->i_sem);
 494                 l_dput(de);
 495                 if (locked) {
 496                         if (rc) {
 497                                 ldlm_lock_decref(&lockh, LCK_PW);
 498                         } else {
 499                                 ptlrpc_save_lock (req, &lockh, LCK_PW);
 500                         }
 501                 }
 502         case 0:
 503                 break;
 504         default:
 505                 LBUG();
 506         }
 507         if (err && !rc)
 508                 rc = err;
 509
 510         req->rq_status = rc;
 511         return 0;
 512 }
 513
 514 static void reconstruct_reint_create(struct mds_update_record *rec, int offset,
 515                                      struct ptlrpc_request *req)
 516 {
 517         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 518         struct mds_obd *obd = &req->rq_export->exp_obd->u.mds;
 519         struct dentry *parent, *child;
 520         struct mds_body *body;
 521
 522         mds_req_from_mcd(req, med->med_mcd);
 523
 524         if (req->rq_status)
 525                 return;
 526
 527         parent = mds_fid2dentry(obd, rec->ur_fid1, NULL);
 528         LASSERT(!IS_ERR(parent));
 529         child = ll_lookup_one_len(rec->ur_name, parent, rec->ur_namelen - 1);
 530         LASSERT(!IS_ERR(child));
 531         body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
 532         mds_pack_inode2fid(&body->fid1, child->d_inode);
 533         mds_pack_inode2body(body, child->d_inode);
 534         l_dput(parent);
 535         l_dput(child);
 536 }
 537
 538 static int mds_reint_create(struct mds_update_record *rec, int offset,
 539                             struct ptlrpc_request *req,
 540                             struct lustre_handle *lh)
 541 {
 542         struct dentry *dparent = NULL;
 543         struct mds_obd *mds = mds_req2mds(req);
 544         struct obd_device *obd = req->rq_export->exp_obd;
 545         struct dentry *dchild = NULL;
 546         struct inode *dir = NULL;
 547         void *handle = NULL;
 548         struct lustre_handle lockh;
 549         int rc = 0, err, type = rec->ur_mode & S_IFMT, cleanup_phase = 0;
 550         int created = 0;
 551         struct dentry_params dp;
 552         ENTRY;
 553
 554         LASSERT(offset == 0);
 555         LASSERT(!strcmp(req->rq_export->exp_obd->obd_type->typ_name, "mds"));
 556
 557         DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u name %s mode %o",
 558                   rec->ur_fid1->id, rec->ur_fid1->generation,
 559                   rec->ur_name, rec->ur_mode);
 560
 561         MDS_CHECK_RESENT(req, reconstruct_reint_create(rec, offset, req));
 562
 563         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_CREATE))
 564                 GOTO(cleanup, rc = -ESTALE);
 565
 566         dparent = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL, LCK_PW, &lockh,
 567                                         rec->ur_name, rec->ur_namelen - 1);
 568         if (IS_ERR(dparent)) {
 569                 rc = PTR_ERR(dparent);
 570                 if (rc != -ENOENT)
 571                         CERROR("parent lookup error %d\n", rc);
 572                 GOTO(cleanup, rc);
 573         }
 574         cleanup_phase = 1; /* locked parent dentry */
 575         dir = dparent->d_inode;
 576         LASSERT(dir);
 577
 578         ldlm_lock_dump_handle(D_OTHER, &lockh);
 579
 580         dchild = ll_lookup_one_len(rec->ur_name, dparent, rec->ur_namelen - 1);
 581         if (IS_ERR(dchild)) {
 582                 rc = PTR_ERR(dchild);
 583                 CERROR("child lookup error %d\n", rc);
 584                 GOTO(cleanup, rc);
 585         }
 586
 587         cleanup_phase = 2; /* child dentry */
 588
 589         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_CREATE_WRITE, dir->i_sb);
 590
 591         if (dir->i_mode & S_ISGID) {
 592                 if (S_ISDIR(rec->ur_mode))
 593                         rec->ur_mode |= S_ISGID;
 594         }
 595
 596         dchild->d_fsdata = (void *)&dp;
 597         dp.p_inum = (unsigned long)rec->ur_fid2->id;
 598         dp.p_ptr = req;
 599
 600         switch (type) {
 601         case S_IFREG:{
 602                 handle = fsfilt_start(obd, dir, FSFILT_OP_CREATE, NULL);
 603                 if (IS_ERR(handle))
 604                         GOTO(cleanup, rc = PTR_ERR(handle));
 605                 rc = ll_vfs_create(dir, dchild, rec->ur_mode, NULL);
 606                 EXIT;
 607                 break;
 608         }
 609         case S_IFDIR:{
 610                 handle = fsfilt_start(obd, dir, FSFILT_OP_MKDIR, NULL);
 611                 if (IS_ERR(handle))
 612                         GOTO(cleanup, rc = PTR_ERR(handle));
 613                 rc = vfs_mkdir(dir, dchild, rec->ur_mode);
 614                 EXIT;
 615                 break;
 616         }
 617         case S_IFLNK:{
 618                 handle = fsfilt_start(obd, dir, FSFILT_OP_SYMLINK, NULL);
 619                 if (IS_ERR(handle))
 620                         GOTO(cleanup, rc = PTR_ERR(handle));
 621                 if (rec->ur_tgt == NULL)        /* no target supplied */
 622                         rc = -EINVAL;           /* -EPROTO? */
 623                 else
 624                         rc = ll_vfs_symlink(dir, dchild, rec->ur_tgt, S_IALLUGO);
 625                 EXIT;
 626                 break;
 627         }
 628         case S_IFCHR:
 629         case S_IFBLK:
 630         case S_IFIFO:
 631         case S_IFSOCK:{
 632                 int rdev = rec->ur_rdev;
 633                 handle = fsfilt_start(obd, dir, FSFILT_OP_MKNOD, NULL);
 634                 if (IS_ERR(handle))
 635                         GOTO(cleanup, (handle = NULL, rc = PTR_ERR(handle)));
 636                 rc = vfs_mknod(dir, dchild, rec->ur_mode, rdev);
 637                 EXIT;
 638                 break;
 639         }
 640         default:
 641                 CERROR("bad file type %o creating %s\n", type, rec->ur_name);
 642                 dchild->d_fsdata = NULL;
 643                 GOTO(cleanup, rc = -EINVAL);
 644         }
 645
 646         /* In case we stored the desired inum in here, we want to clean up. */
 647         if (dchild->d_fsdata == (void *)(unsigned long)rec->ur_fid2->id)
 648                 dchild->d_fsdata = NULL;
 649
 650         if (rc) {
 651                 CDEBUG(D_INODE, "error during create: %d\n", rc);
 652                 GOTO(cleanup, rc);
 653         } else {
 654                 struct iattr iattr;
 655                 struct inode *inode = dchild->d_inode;
 656                 struct mds_body *body;
 657
 658                 created = 1;
 659                 LTIME_S(iattr.ia_atime) = rec->ur_time;
 660                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
 661                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
 662                 iattr.ia_uid = rec->ur_fsuid;
 663                 if (dir->i_mode & S_ISGID)
 664                         iattr.ia_gid = dir->i_gid;
 665                 else
 666                         iattr.ia_gid = rec->ur_fsgid;
 667                 iattr.ia_valid = ATTR_UID | ATTR_GID | ATTR_ATIME |
 668                         ATTR_MTIME | ATTR_CTIME;
 669
 670                 if (rec->ur_fid2->id) {
 671                         LASSERT(rec->ur_fid2->id == inode->i_ino);
 672                         inode->i_generation = rec->ur_fid2->generation;
 673                         /* Dirtied and committed by the upcoming setattr. */
 674                         CDEBUG(D_INODE, "recreated ino %lu with gen %u\n",
 675                                inode->i_ino, inode->i_generation);
 676                 } else {
 677                         struct lustre_handle child_ino_lockh;
 678
 679                         CDEBUG(D_INODE, "created ino %lu with gen %x\n",
 680                                inode->i_ino, inode->i_generation);
 681
 682                         /* The inode we were allocated may have just been freed
 683                          * by an unlink operation.  We take this lock to
 684                          * synchronize against the matching reply-ack-lock taken
 685                          * in unlink, to avoid replay problems if this reply
 686                          * makes it out to the client but the unlink's does not.
 687                          * See bug 2029 for more detail.*/
 688                         rc = mds_lock_new_child(obd, inode, &child_ino_lockh);
 689                         if (rc != ELDLM_OK) {
 690                                 CERROR("error locking for unlink/create sync: "
 691                                        "%d\n", rc);
 692                         } else {
 693                                 ldlm_lock_decref(&child_ino_lockh, LCK_EX);
 694                         }
 695                 }
 696
 697                 rc = fsfilt_setattr(obd, dchild, handle, &iattr, 0);
 698                 if (rc)
 699                         CERROR("error on child setattr: rc = %d\n", rc);
 700
 701                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
 702                 rc = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
 703                 if (rc)
 704                         CERROR("error on parent setattr: rc = %d\n", rc);
 705
 706                 body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
 707                 mds_pack_inode2fid(&body->fid1, inode);
 708                 mds_pack_inode2body(body, inode);
 709         }
 710         EXIT;
 711
 712 cleanup:
 713         err = mds_finish_transno(mds, dir, handle, req, rc, 0);
 714
 715         if (rc && created) {
 716                 /* Destroy the file we just created.  This should not need
 717                  * extra journal credits, as we have already modified all of
 718                  * the blocks needed in order to create the file in the first
 719                  * place.
 720                  */
 721                 switch (type) {
 722                 case S_IFDIR:
 723                         err = vfs_rmdir(dir, dchild);
 724                         if (err)
 725                                 CERROR("rmdir in error path: %d\n", err);
 726                         break;
 727                 default:
 728                         err = vfs_unlink(dir, dchild);
 729                         if (err)
 730                                 CERROR("unlink in error path: %d\n", err);
 731                         break;
 732                 }
 733         } else {
 734                 rc = err;
 735         }
 736         switch (cleanup_phase) {
 737         case 2: /* child dentry */
 738                 l_dput(dchild);
 739         case 1: /* locked parent dentry */
 740                 if (rc) {
 741                         ldlm_lock_decref(&lockh, LCK_PW);
 742                 } else {
 743                         ptlrpc_save_lock (req, &lockh, LCK_PW);
 744                 }
 745                 l_dput(dparent);
 746         case 0:
 747                 break;
 748         default:
 749                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
 750                 LBUG();
 751         }
 752         req->rq_status = rc;
 753         return 0;
 754 }
 755
 756 int res_gt(struct ldlm_res_id *res1, struct ldlm_res_id *res2)
 757 {
 758         int i;
 759
 760         for (i = 0; i < RES_NAME_SIZE; i++) {
 761                 /* return 1 here, because enqueue_ordered will skip resources
 762                  * of all zeroes if they're sorted to the end of the list. */
 763                 if (res1->name[i] == 0 && res2->name[i] != 0)
 764                         return 1;
 765                 if (res2->name[i] == 0 && res1->name[i] != 0)
 766                         return 0;
 767
 768                 if (res1->name[i] > res2->name[i])
 769                         return 1;
 770                 if (res1->name[i] < res2->name[i])
 771                         return 0;
 772         }
 773         return 0;
 774 }
 775
 776 /* This function doesn't use ldlm_match_or_enqueue because we're always called
 777  * with EX or PW locks, and the MDS is no longer allowed to match write locks,
 778  * because they take the place of local semaphores.
 779  *
 780  * One or two locks are taken in numerical order.  A res_id->name[0] of 0 means
 781  * no lock is taken for that res_id.  Must be at least one non-zero res_id. */
 782 int enqueue_ordered_locks(struct obd_device *obd, struct ldlm_res_id *p1_res_id,
 783                           struct lustre_handle *p1_lockh, int p1_lock_mode,
 784                           struct ldlm_res_id *p2_res_id,
 785                           struct lustre_handle *p2_lockh, int p2_lock_mode)
 786 {
 787         struct ldlm_res_id *res_id[2] = { p1_res_id, p2_res_id };
 788         struct lustre_handle *handles[2] = { p1_lockh, p2_lockh };
 789         int lock_modes[2] = { p1_lock_mode, p2_lock_mode };
 790         int rc, flags;
 791         ENTRY;
 792
 793         LASSERT(p1_res_id != NULL && p2_res_id != NULL);
 794
 795         CDEBUG(D_INFO, "locks before: "LPU64"/"LPU64"\n",
 796                res_id[0]->name[0], res_id[1]->name[0]);
 797
 798         if (res_gt(p1_res_id, p2_res_id)) {
 799                 handles[1] = p1_lockh;
 800                 handles[0] = p2_lockh;
 801                 res_id[1] = p1_res_id;
 802                 res_id[0] = p2_res_id;
 803                 lock_modes[1] = p1_lock_mode;
 804                 lock_modes[0] = p2_lock_mode;
 805         }
 806
 807         CDEBUG(D_DLMTRACE, "lock order: "LPU64"/"LPU64"\n",
 808                res_id[0]->name[0], res_id[1]->name[0]);
 809
 810         flags = LDLM_FL_LOCAL_ONLY;
 811         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, *res_id[0],
 812                               LDLM_PLAIN, NULL, lock_modes[0], &flags,
 813                               mds_blocking_ast, ldlm_completion_ast, NULL, NULL,
 814                               NULL, 0, NULL, handles[0]);
 815         if (rc != ELDLM_OK)
 816                 RETURN(-EIO);
 817         ldlm_lock_dump_handle(D_OTHER, handles[0]);
 818
 819         if (memcmp(res_id[0], res_id[1], sizeof(*res_id[0])) == 0) {
 820                 memcpy(handles[1], handles[0], sizeof(*(handles[1])));
 821                 ldlm_lock_addref(handles[1], lock_modes[1]);
 822         } else if (res_id[1]->name[0] != 0) {
 823                 flags = LDLM_FL_LOCAL_ONLY;
 824                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
 825                                       *res_id[1], LDLM_PLAIN, NULL,
 826                                       lock_modes[1], &flags, mds_blocking_ast,
 827                                       ldlm_completion_ast, NULL, NULL, NULL, 0,
 828                                       NULL, handles[1]);
 829                 if (rc != ELDLM_OK) {
 830                         ldlm_lock_decref(handles[0], lock_modes[0]);
 831                         RETURN(-EIO);
 832                 }
 833                 ldlm_lock_dump_handle(D_OTHER, handles[1]);
 834         }
 835
 836         RETURN(0);
 837 }
 838
 839 int enqueue_4ordered_locks(struct obd_device *obd,struct ldlm_res_id *p1_res_id,
 840                            struct lustre_handle *p1_lockh, int p1_lock_mode,
 841                            struct ldlm_res_id *p2_res_id,
 842                            struct lustre_handle *p2_lockh, int p2_lock_mode,
 843                            struct ldlm_res_id *c1_res_id,
 844                            struct lustre_handle *c1_lockh, int c1_lock_mode,
 845                            struct ldlm_res_id *c2_res_id,
 846                            struct lustre_handle *c2_lockh, int c2_lock_mode)
 847 {
 848         struct ldlm_res_id *res_id[5] = { p1_res_id, p2_res_id,
 849                                           c1_res_id, c2_res_id };
 850         struct lustre_handle *dlm_handles[5] = { p1_lockh, p2_lockh,
 851                                                  c1_lockh, c2_lockh };
 852         int lock_modes[5] = { p1_lock_mode, p2_lock_mode,
 853                               c1_lock_mode, c2_lock_mode };
 854         int rc, i, j, sorted, flags;
 855         ENTRY;
 856
 857         CDEBUG(D_DLMTRACE, "locks before: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n",
 858                res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0],
 859                res_id[3]->name[0]);
 860
 861         /* simple insertion sort - we have at most 4 elements */
 862         for (i = 1; i < 4; i++) {
 863                 j = i - 1;
 864                 dlm_handles[4] = dlm_handles[i];
 865                 res_id[4] = res_id[i];
 866                 lock_modes[4] = lock_modes[i];
 867
 868                 sorted = 0;
 869                 do {
 870                         if (res_gt(res_id[j], res_id[4])) {
 871                                 dlm_handles[j + 1] = dlm_handles[j];
 872                                 res_id[j + 1] = res_id[j];
 873                                 lock_modes[j + 1] = lock_modes[j];
 874                                 j--;
 875                         } else {
 876                                 sorted = 1;
 877                         }
 878                 } while (j >= 0 && !sorted);
 879
 880                 dlm_handles[j + 1] = dlm_handles[4];
 881                 res_id[j + 1] = res_id[4];
 882                 lock_modes[j + 1] = lock_modes[4];
 883         }
 884
 885         CDEBUG(D_DLMTRACE, "lock order: "LPU64"/"LPU64"/"LPU64"/"LPU64"\n",
 886                res_id[0]->name[0], res_id[1]->name[0], res_id[2]->name[0],
 887                res_id[3]->name[0]);
 888
 889         /* XXX we could send ASTs on all these locks first before blocking? */
 890         for (i = 0; i < 4; i++) {
 891                 flags = 0;
 892                 if (res_id[i]->name[0] == 0)
 893                         break;
 894                 if (i != 0 &&
 895                     memcmp(res_id[i], res_id[i-1], sizeof(*res_id[i])) == 0) {
 896                         memcpy(dlm_handles[i], dlm_handles[i-1],
 897                                sizeof(*(dlm_handles[i])));
 898                         ldlm_lock_addref(dlm_handles[i], lock_modes[i]);
 899                 } else {
 900                         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
 901                                               *res_id[i], LDLM_PLAIN, NULL,
 902                                               lock_modes[i], &flags,
 903                                               mds_blocking_ast,
 904                                               ldlm_completion_ast, NULL, NULL,
 905                                               NULL, 0, NULL, dlm_handles[i]);
 906                         if (rc != ELDLM_OK)
 907                                 GOTO(out_err, rc = -EIO);
 908                         ldlm_lock_dump_handle(D_OTHER, dlm_handles[i]);
 909                 }
 910         }
 911
 912         RETURN(0);
 913 out_err:
 914         while (i-- > 0)
 915                 ldlm_lock_decref(dlm_handles[i], lock_modes[i]);
 916
 917         return rc;
 918 }
 919
 920 /* In the unlikely case that the child changed while we were waiting
 921  * on the lock, we need to drop the lock on the old child and either:
 922  * - if the child has a lower resource name, then we have to also
 923  *   drop the parent lock and regain the locks in the right order
 924  * - in the rename case, if the child has a lower resource name than one of
 925  *   the other parent/child resources (maxres) we also need to reget the locks
 926  * - if the child has a higher resource name (this is the common case)
 927  *   we can just get the lock on the new child (still in lock order)
 928  *
 929  * Returns 0 if the child did not change or if it changed but could be locked.
 930  * Returns 1 if the child changed and we need to re-lock (no locks held).
 931  * Returns -ve error with a valid dchild (no locks held). */
 932 static int mds_verify_child(struct obd_device *obd,
 933                             struct ldlm_res_id *parent_res_id,
 934                             struct lustre_handle *parent_lockh,
 935                             struct dentry *dparent, int parent_mode,
 936                             struct ldlm_res_id *child_res_id,
 937                             struct lustre_handle *child_lockh,
 938                             struct dentry **dchildp, int child_mode,
 939                             const char *name, int namelen,
 940                             struct ldlm_res_id *maxres)
 941 {
 942         struct dentry *vchild, *dchild = *dchildp;
 943         int rc = 0, cleanup_phase = 2; /* parent, child locks */
 944         ENTRY;
 945
 946         vchild = ll_lookup_one_len(name, dparent, namelen - 1);
 947         if (IS_ERR(vchild))
 948                 GOTO(cleanup, rc = PTR_ERR(vchild));
 949
 950         if (likely((vchild->d_inode == NULL && child_res_id->name[0] == 0) ||
 951                    (vchild->d_inode != NULL &&
 952                     child_res_id->name[0] == vchild->d_inode->i_ino &&
 953                     child_res_id->name[1] == vchild->d_inode->i_generation))) {
 954                 if (dchild != NULL)
 955                         l_dput(dchild);
 956                 *dchildp = vchild;
 957
 958                 RETURN(0);
 959         }
 960
 961         CDEBUG(D_DLMTRACE, "child inode changed: %p != %p (%lu != "LPU64")\n",
 962                vchild->d_inode, dchild ? dchild->d_inode : 0,
 963                vchild->d_inode ? vchild->d_inode->i_ino : 0,
 964                child_res_id->name[0]);
 965         if (child_res_id->name[0] != 0)
 966                 ldlm_lock_decref(child_lockh, child_mode);
 967         if (dchild)
 968                 l_dput(dchild);
 969
 970         cleanup_phase = 1; /* parent lock only */
 971         *dchildp = dchild = vchild;
 972
 973         if (dchild->d_inode) {
 974                 int flags = 0;
 975                 child_res_id->name[0] = dchild->d_inode->i_ino;
 976                 child_res_id->name[1] = dchild->d_inode->i_generation;
 977
 978                 if (res_gt(parent_res_id, child_res_id) ||
 979                     res_gt(maxres, child_res_id)) {
 980                         CDEBUG(D_DLMTRACE, "relock "LPU64"<("LPU64"|"LPU64")\n",
 981                                child_res_id->name[0], parent_res_id->name[0],
 982                                maxres->name[0]);
 983                         GOTO(cleanup, rc = 1);
 984                 }
 985
 986                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
 987                                       *child_res_id, LDLM_PLAIN, NULL,
 988                                       child_mode, &flags, mds_blocking_ast,
 989                                       ldlm_completion_ast, NULL, NULL, NULL, 0,
 990                                       NULL, child_lockh);
 991                 if (rc != ELDLM_OK)
 992                         GOTO(cleanup, rc = -EIO);
 993         } else {
 994                 memset(child_res_id, 0, sizeof(*child_res_id));
 995         }
 996
 997         EXIT;
 998 cleanup:
 999         if (rc) {
1000                 switch(cleanup_phase) {
1001                 case 2:
1002                         if (child_res_id->name[0] != 0)
1003                                 ldlm_lock_decref(child_lockh, child_mode);
1004                 case 1:
1005                         ldlm_lock_decref(parent_lockh, parent_mode);
1006                 }
1007         }
1008         return rc;
1009 }
1010
1011 int mds_get_parent_child_locked(struct obd_device *obd, struct mds_obd *mds,
1012                                 struct ll_fid *fid,
1013                                 struct lustre_handle *parent_lockh,
1014                                 struct dentry **dparentp, int parent_mode,
1015                                 char *name, int namelen,
1016                                 struct lustre_handle *child_lockh,
1017                                 struct dentry **dchildp, int child_mode)
1018 {
1019         struct ldlm_res_id child_res_id = { .name = {0} };
1020         struct ldlm_res_id parent_res_id = { .name = {0} };
1021         struct inode *inode;
1022         int rc = 0, cleanup_phase = 0;
1023         ENTRY;
1024
1025         /* Step 1: Lookup parent */
1026         *dparentp = mds_fid2dentry(mds, fid, NULL);
1027         if (IS_ERR(*dparentp)) {
1028                 rc = PTR_ERR(*dparentp);
1029                 *dparentp = NULL;
1030                 RETURN(rc);
1031         }
1032
1033         CDEBUG(D_INODE, "parent ino %lu, name %s\n",
1034                (*dparentp)->d_inode->i_ino, name);
1035
1036         parent_res_id.name[0] = (*dparentp)->d_inode->i_ino;
1037         parent_res_id.name[1] = (*dparentp)->d_inode->i_generation;
1038
1039         cleanup_phase = 1; /* parent dentry */
1040
1041         /* Step 2: Lookup child (without DLM lock, to get resource name) */
1042         *dchildp = ll_lookup_one_len(name, *dparentp, namelen - 1);
1043         if (IS_ERR(*dchildp)) {
1044                 rc = PTR_ERR(*dchildp);
1045                 CDEBUG(D_INODE, "child lookup error %d\n", rc);
1046                 GOTO(cleanup, rc);
1047         }
1048
1049         cleanup_phase = 2; /* child dentry */
1050         inode = (*dchildp)->d_inode;
1051         if (inode != NULL) {
1052                 if (is_bad_inode(inode)) {
1053                         CERROR("bad inode returned %lu/%u\n",
1054                                inode->i_ino, inode->i_generation);
1055                         GOTO(cleanup, rc = -ENOENT);
1056                 }
1057                 inode = igrab(inode);
1058         }
1059         if (inode == NULL)
1060                 goto retry_locks;
1061
1062         child_res_id.name[0] = inode->i_ino;
1063         child_res_id.name[1] = inode->i_generation;
1064         iput(inode);
1065
1066 retry_locks:
1067         cleanup_phase = 2; /* child dentry */
1068
1069         /* Step 3: Lock parent and child in resource order.  If child doesn't
1070          *         exist, we still have to lock the parent and re-lookup. */
1071         rc = enqueue_ordered_locks(obd,&parent_res_id,parent_lockh,parent_mode,
1072                                    &child_res_id, child_lockh, child_mode);
1073         if (rc)
1074                 GOTO(cleanup, rc);
1075
1076         if (!(*dchildp)->d_inode)
1077                 cleanup_phase = 3; /* parent lock */
1078         else
1079                 cleanup_phase = 4; /* child lock */
1080
1081         /* Step 4: Re-lookup child to verify it hasn't changed since locking */
1082         rc = mds_verify_child(obd, &parent_res_id, parent_lockh, *dparentp,
1083                               parent_mode, &child_res_id, child_lockh, dchildp,
1084                               child_mode, name, namelen, &parent_res_id);
1085         if (rc > 0)
1086                 goto retry_locks;
1087         if (rc < 0) {
1088                 cleanup_phase = 3;
1089                 GOTO(cleanup, rc);
1090         }
1091
1092 cleanup:
1093         if (rc) {
1094                 switch (cleanup_phase) {
1095                 case 4:
1096                         ldlm_lock_decref(child_lockh, child_mode);
1097                 case 3:
1098                         ldlm_lock_decref(parent_lockh, parent_mode);
1099                 case 2:
1100                         l_dput(*dchildp);
1101                 case 1:
1102                         l_dput(*dparentp);
1103                 default: ;
1104                 }
1105         }
1106         return rc;
1107 }
1108
1109 void mds_reconstruct_generic(struct ptlrpc_request *req)
1110 {
1111         struct mds_export_data *med = &req->rq_export->exp_mds_data;
1112
1113         mds_req_from_mcd(req, med->med_mcd);
1114 }
1115
1116 /* If we are unlinking an open file/dir (i.e. creating an orphan) then
1117  * we instead link the inode into the PENDING directory until it is
1118  * finally released.  We can't simply call mds_reint_rename() or some
1119  * part thereof, because we don't have the inode to check for link
1120  * count/open status until after it is locked.
1121  *
1122  * For lock ordering, caller must get child->i_sem first, then pending->i_sem
1123  * before starting journal transaction.
1124  *
1125  * returns 1 on success
1126  * returns 0 if we lost a race and didn't make a new link
1127  * returns negative on error
1128  */
1129 static int mds_orphan_add_link(struct mds_update_record *rec,
1130                                struct obd_device *obd, struct dentry *dentry)
1131 {
1132         struct mds_obd *mds = &obd->u.mds;
1133         struct inode *pending_dir = mds->mds_pending_dir->d_inode;
1134         struct inode *inode = dentry->d_inode;
1135         struct dentry *pending_child;
1136         char fidname[LL_FID_NAMELEN];
1137         int fidlen = 0, rc, mode;
1138         ENTRY;
1139
1140         LASSERT(inode != NULL);
1141         LASSERT(!mds_inode_is_orphan(inode));
1142 #ifndef HAVE_I_ALLOC_SEM
1143         LASSERT(down_trylock(&inode->i_sem) != 0);
1144 #endif
1145         LASSERT(down_trylock(&pending_dir->i_sem) != 0);
1146
1147         fidlen = ll_fid2str(fidname, inode->i_ino, inode->i_generation);
1148
1149         CDEBUG(D_INODE, "pending destroy of %dx open %d linked %s %s = %s\n",
1150                mds_orphan_open_count(inode), inode->i_nlink,
1151                S_ISDIR(inode->i_mode) ? "dir" :
1152                 S_ISREG(inode->i_mode) ? "file" : "other",rec->ur_name,fidname);
1153
1154         if (mds_orphan_open_count(inode) == 0 || inode->i_nlink != 0)
1155                 RETURN(0);
1156
1157         pending_child = lookup_one_len(fidname, mds->mds_pending_dir, fidlen);
1158         if (IS_ERR(pending_child))
1159                 RETURN(PTR_ERR(pending_child));
1160
1161         if (pending_child->d_inode != NULL) {
1162                 CERROR("re-destroying orphan file %s?\n", rec->ur_name);
1163                 LASSERT(pending_child->d_inode == inode);
1164                 GOTO(out_dput, rc = 0);
1165         }
1166
1167         /* link() is semanticaly-wrong for S_IFDIR, so we set S_IFREG
1168          * for linking and return real mode back then -bzzz */
1169         mode = inode->i_mode;
1170         inode->i_mode = S_IFREG;
1171         rc = vfs_link(dentry, pending_dir, pending_child);
1172         if (rc)
1173                 CERROR("error linking orphan %s to PENDING: rc = %d\n",
1174                        rec->ur_name, rc);
1175         else
1176                 mds_inode_set_orphan(inode);
1177
1178         /* return mode and correct i_nlink if inode is directory */
1179         inode->i_mode = mode;
1180         LASSERTF(inode->i_nlink == 1, "%s nlink == %d\n",
1181                  S_ISDIR(mode) ? "dir" : S_ISREG(mode) ? "file" : "other",
1182                  inode->i_nlink);
1183         if (S_ISDIR(mode)) {
1184                 inode->i_nlink++;
1185                 pending_dir->i_nlink++;
1186                 mark_inode_dirty(inode);
1187                 mark_inode_dirty(pending_dir);
1188         }
1189
1190         GOTO(out_dput, rc = 1);
1191 out_dput:
1192         l_dput(pending_child);
1193         RETURN(rc);
1194 }
1195
1196 static int mds_reint_unlink(struct mds_update_record *rec, int offset,
1197                             struct ptlrpc_request *req,
1198                             struct lustre_handle *lh)
1199 {
1200         struct dentry *dparent = NULL, *dchild;
1201         struct mds_obd *mds = mds_req2mds(req);
1202         struct obd_device *obd = req->rq_export->exp_obd;
1203         struct mds_body *body = NULL;
1204         struct inode *child_inode = NULL;
1205         struct lustre_handle parent_lockh, child_lockh, child_reuse_lockh;
1206         void *handle = NULL;
1207         int rc = 0, cleanup_phase = 0;
1208         ENTRY;
1209
1210         LASSERT(offset == 0 || offset == 2);
1211
1212         DEBUG_REQ(D_INODE, req, "parent ino "LPU64"/%u, child %s",
1213                   rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_name);
1214
1215         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1216
1217         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_UNLINK))
1218                 GOTO(cleanup, rc = -ENOENT);
1219
1220         rc = mds_get_parent_child_locked(obd, mds, rec->ur_fid1,
1221                                          &parent_lockh, &dparent, LCK_PW,
1222                                          rec->ur_name, rec->ur_namelen,
1223                                          &child_lockh, &dchild, LCK_EX);
1224         if (rc)
1225                 GOTO(cleanup, rc);
1226
1227         cleanup_phase = 1; /* dchild, dparent, locks */
1228
1229         dget(dchild);
1230         child_inode = dchild->d_inode;
1231         if (child_inode == NULL) {
1232                 CDEBUG(D_INODE, "child doesn't exist (dir %lu, name %s)\n",
1233                        dparent->d_inode->i_ino, rec->ur_name);
1234                 GOTO(cleanup, rc = -ENOENT);
1235         }
1236
1237         cleanup_phase = 2; /* dchild has a lock */
1238
1239         /* Step 4: Get a lock on the ino to sync with creation WRT inode
1240          * reuse (see bug 2029). */
1241         rc = mds_lock_new_child(obd, child_inode, &child_reuse_lockh);
1242         if (rc != ELDLM_OK)
1243                 GOTO(cleanup, rc);
1244
1245         cleanup_phase = 3; /* child inum lock */
1246
1247         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_UNLINK_WRITE, dparent->d_inode->i_sb);
1248
1249         /* ldlm_reply in buf[0] if called via intent */
1250         if (offset)
1251                 offset = 1;
1252
1253         body = lustre_msg_buf(req->rq_repmsg, offset, sizeof (*body));
1254         LASSERT(body != NULL);
1255
1256         /* child orphan sem protects orphan_dec_test && is_orphan race */
1257         MDS_DOWN_READ_ORPHAN_SEM(child_inode);
1258         cleanup_phase = 4; /* MDS_UP_READ_ORPHAN_SEM(new_inode) when finished */
1259
1260         /* If this is potentially the last reference to this inode, get the
1261          * OBD EA data first so the client can destroy OST objects.  We
1262          * only do the object removal later if no open files/links remain. */
1263         if ((S_ISDIR(child_inode->i_mode) && child_inode->i_nlink == 2) ||
1264             child_inode->i_nlink == 1) {
1265                 if (mds_orphan_open_count(child_inode) > 0) {
1266                         /* need to lock pending_dir before transaction */
1267                         down(&mds->mds_pending_dir->d_inode->i_sem);
1268                         cleanup_phase = 5; /* up(&pending_dir->i_sem) */
1269                 } else if (S_ISREG(child_inode->i_mode)) {
1270                         mds_pack_inode2fid(&body->fid1, child_inode);
1271                         mds_pack_inode2body(body, child_inode);
1272                         mds_pack_md(obd, req->rq_repmsg, offset + 1, body,
1273                                     child_inode, MDS_PACK_MD_LOCK);
1274                 }
1275         }
1276
1277         /* We have to do these checks ourselves, in case we are making an
1278          * orphan.  The client tells us whether rmdir() or unlink() was called,
1279          * so we need to return appropriate errors (bug 72). */
1280         if ((rec->ur_mode & S_IFMT) == S_IFDIR) {
1281                 if (!S_ISDIR(child_inode->i_mode))
1282                         GOTO(cleanup, rc = -ENOTDIR);
1283         } else {
1284                 if (S_ISDIR(child_inode->i_mode))
1285                         GOTO(cleanup, rc = -EISDIR);
1286         }
1287
1288         /* Step 4: Do the unlink: we already verified ur_mode above (bug 72) */
1289         switch (child_inode->i_mode & S_IFMT) {
1290         case S_IFDIR:
1291                 /* Drop any lingering child directories before we start our
1292                  * transaction, to avoid doing multiple inode dirty/delete
1293                  * in our compound transaction (bug 1321). */
1294                 shrink_dcache_parent(dchild);
1295                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_RMDIR,
1296                                       NULL);
1297                 if (IS_ERR(handle))
1298                         GOTO(cleanup, rc = PTR_ERR(handle));
1299                 rc = vfs_rmdir(dparent->d_inode, dchild);
1300                 break;
1301         case S_IFREG: {
1302                 struct lov_mds_md *lmm = lustre_msg_buf(req->rq_repmsg,
1303                                                         offset + 1, 0);
1304                 handle = fsfilt_start_log(obd, dparent->d_inode,
1305                                           FSFILT_OP_UNLINK, NULL,
1306                                           le32_to_cpu(lmm->lmm_stripe_count));
1307                 if (IS_ERR(handle))
1308                         GOTO(cleanup, rc = PTR_ERR(handle));
1309                 rc = vfs_unlink(dparent->d_inode, dchild);
1310                 break;
1311         }
1312         case S_IFLNK:
1313         case S_IFCHR:
1314         case S_IFBLK:
1315         case S_IFIFO:
1316         case S_IFSOCK:
1317                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_UNLINK,
1318                                       NULL);
1319                 if (IS_ERR(handle))
1320                         GOTO(cleanup, rc = PTR_ERR(handle));
1321                 rc = vfs_unlink(dparent->d_inode, dchild);
1322                 break;
1323         default:
1324                 CERROR("bad file type %o unlinking %s\n", rec->ur_mode,
1325                        rec->ur_name);
1326                 LBUG();
1327                 GOTO(cleanup, rc = -EINVAL);
1328         }
1329
1330         if (rc == 0 && child_inode->i_nlink == 0) {
1331                 if (mds_orphan_open_count(child_inode) > 0)
1332                         rc = mds_orphan_add_link(rec, obd, dchild);
1333
1334                 if (rc == 1)
1335                         GOTO(cleanup, rc = 0);
1336
1337                 if (!S_ISREG(child_inode->i_mode))
1338                         GOTO(cleanup, rc);
1339
1340                 if (!(body->valid & OBD_MD_FLEASIZE)) {
1341                         body->valid |=(OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1342                                        OBD_MD_FLATIME | OBD_MD_FLMTIME);
1343                 } else if (mds_log_op_unlink(obd, child_inode,
1344                                 lustre_msg_buf(req->rq_repmsg, offset + 1, 0),
1345                                         req->rq_repmsg->buflens[offset + 1],
1346                                 lustre_msg_buf(req->rq_repmsg, offset + 2, 0),
1347                                         req->rq_repmsg->buflens[offset+2]) > 0){
1348                         body->valid |= OBD_MD_FLCOOKIE;
1349                 }
1350         }
1351
1352         GOTO(cleanup, rc);
1353 cleanup:
1354         if (rc == 0) {
1355                 struct iattr iattr;
1356                 int err;
1357
1358                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
1359                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
1360                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
1361
1362                 err = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
1363                 if (err)
1364                         CERROR("error on parent setattr: rc = %d\n", err);
1365         }
1366
1367         rc = mds_finish_transno(mds, dparent ? dparent->d_inode : NULL,
1368                                 handle, req, rc, 0);
1369         if (!rc)
1370                 (void)obd_set_info(mds->mds_osc_exp, strlen("unlinked"),
1371                                    "unlinked", 0, NULL);
1372         switch(cleanup_phase) {
1373         case 5: /* pending_dir semaphore */
1374                 up(&mds->mds_pending_dir->d_inode->i_sem);
1375         case 4: /* child inode semaphore */
1376                 MDS_UP_READ_ORPHAN_SEM(child_inode);
1377         case 3: /* child ino-reuse lock */
1378                 if (rc && body != NULL) {
1379                         // Don't unlink the OST objects if the MDS unlink failed
1380                         body->valid = 0;
1381                 }
1382                 if (rc)
1383                         ldlm_lock_decref(&child_reuse_lockh, LCK_EX);
1384                 else
1385                         ptlrpc_save_lock(req, &child_reuse_lockh, LCK_EX);
1386         case 2: /* child lock */
1387                 ldlm_lock_decref(&child_lockh, LCK_EX);
1388         case 1: /* child and parent dentry, parent lock */
1389                 if (rc)
1390                         ldlm_lock_decref(&parent_lockh, LCK_PW);
1391                 else
1392                         ptlrpc_save_lock(req, &parent_lockh, LCK_PW);
1393                 l_dput(dchild);
1394                 l_dput(dchild);
1395                 l_dput(dparent);
1396         case 0:
1397                 break;
1398         default:
1399                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1400                 LBUG();
1401         }
1402         req->rq_status = rc;
1403         return 0;
1404 }
1405
1406 static int mds_reint_link(struct mds_update_record *rec, int offset,
1407                           struct ptlrpc_request *req,
1408                           struct lustre_handle *lh)
1409 {
1410         struct obd_device *obd = req->rq_export->exp_obd;
1411         struct dentry *de_src = NULL;
1412         struct dentry *de_tgt_dir = NULL;
1413         struct dentry *dchild = NULL;
1414         struct mds_obd *mds = mds_req2mds(req);
1415         struct lustre_handle *handle = NULL, tgt_dir_lockh, src_lockh;
1416         struct ldlm_res_id src_res_id = { .name = {0} };
1417         struct ldlm_res_id tgt_dir_res_id = { .name = {0} };
1418         int rc = 0, cleanup_phase = 0;
1419         ENTRY;
1420
1421         LASSERT(offset == 0);
1422
1423         DEBUG_REQ(D_INODE, req, "original "LPU64"/%u to "LPU64"/%u %s",
1424                   rec->ur_fid1->id, rec->ur_fid1->generation,
1425                   rec->ur_fid2->id, rec->ur_fid2->generation, rec->ur_name);
1426
1427         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1428
1429         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_LINK))
1430                 GOTO(cleanup, rc = -ENOENT);
1431
1432         /* Step 1: Lookup the source inode and target directory by FID */
1433         de_src = mds_fid2dentry(mds, rec->ur_fid1, NULL);
1434         if (IS_ERR(de_src))
1435                 GOTO(cleanup, rc = PTR_ERR(de_src));
1436
1437         cleanup_phase = 1; /* source dentry */
1438
1439         de_tgt_dir = mds_fid2dentry(mds, rec->ur_fid2, NULL);
1440         if (IS_ERR(de_tgt_dir)) {
1441                 rc = PTR_ERR(de_tgt_dir);
1442                 de_tgt_dir = NULL;
1443                 GOTO(cleanup, rc);
1444         }
1445
1446         cleanup_phase = 2; /* target directory dentry */
1447
1448         CDEBUG(D_INODE, "linking %.*s/%s to inode %lu\n",
1449                de_tgt_dir->d_name.len, de_tgt_dir->d_name.name, rec->ur_name,
1450                de_src->d_inode->i_ino);
1451
1452         /* Step 2: Take the two locks */
1453         src_res_id.name[0] = de_src->d_inode->i_ino;
1454         src_res_id.name[1] = de_src->d_inode->i_generation;
1455         tgt_dir_res_id.name[0] = de_tgt_dir->d_inode->i_ino;
1456         tgt_dir_res_id.name[1] = de_tgt_dir->d_inode->i_generation;
1457
1458         rc = enqueue_ordered_locks(obd, &src_res_id, &src_lockh, LCK_EX,
1459                                    &tgt_dir_res_id, &tgt_dir_lockh, LCK_EX);
1460         if (rc)
1461                 GOTO(cleanup, rc);
1462
1463         cleanup_phase = 3; /* locks */
1464
1465         /* Step 3: Lookup the child */
1466         dchild = ll_lookup_one_len(rec->ur_name, de_tgt_dir, rec->ur_namelen-1);
1467         if (IS_ERR(dchild)) {
1468                 rc = PTR_ERR(dchild);
1469                 if (rc != -EPERM && rc != -EACCES)
1470                         CERROR("child lookup error %d\n", rc);
1471                 GOTO(cleanup, rc);
1472         }
1473
1474         cleanup_phase = 4; /* child dentry */
1475
1476         if (dchild->d_inode) {
1477                 CDEBUG(D_INODE, "child exists (dir %lu, name %s)\n",
1478                        de_tgt_dir->d_inode->i_ino, rec->ur_name);
1479                 rc = -EEXIST;
1480                 GOTO(cleanup, rc);
1481         }
1482
1483         /* Step 4: Do it. */
1484         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_LINK_WRITE, de_src->d_inode->i_sb);
1485
1486         handle = fsfilt_start(obd, de_tgt_dir->d_inode, FSFILT_OP_LINK, NULL);
1487         if (IS_ERR(handle)) {
1488                 rc = PTR_ERR(handle);
1489                 GOTO(cleanup, rc);
1490         }
1491
1492         rc = vfs_link(de_src, de_tgt_dir->d_inode, dchild);
1493         if (rc && rc != -EPERM && rc != -EACCES)
1494                 CERROR("vfs_link error %d\n", rc);
1495 cleanup:
1496         rc = mds_finish_transno(mds, de_tgt_dir ? de_tgt_dir->d_inode : NULL,
1497                                 handle, req, rc, 0);
1498         EXIT;
1499
1500         switch (cleanup_phase) {
1501         case 4: /* child dentry */
1502                 l_dput(dchild);
1503         case 3: /* locks */
1504                 if (rc) {
1505                         ldlm_lock_decref(&src_lockh, LCK_EX);
1506                         ldlm_lock_decref(&tgt_dir_lockh, LCK_EX);
1507                 } else {
1508                         ptlrpc_save_lock(req, &src_lockh, LCK_EX);
1509                         ptlrpc_save_lock(req, &tgt_dir_lockh, LCK_EX);
1510                 }
1511         case 2: /* target dentry */
1512                 l_dput(de_tgt_dir);
1513         case 1: /* source dentry */
1514                 l_dput(de_src);
1515         case 0:
1516                 break;
1517         default:
1518                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1519                 LBUG();
1520         }
1521         req->rq_status = rc;
1522         return 0;
1523 }
1524
1525 /* The idea here is that we need to get four locks in the end:
1526  * one on each parent directory, one on each child.  We need to take
1527  * these locks in some kind of order (to avoid deadlocks), and the order
1528  * I selected is "increasing resource number" order.  We need to look up
1529  * the children, however, before we know what the resource number(s) are.
1530  * Thus the following plan:
1531  *
1532  * 1,2. Look up the parents
1533  * 3,4. Look up the children
1534  * 5. Take locks on the parents and children, in order
1535  * 6. Verify that the children haven't changed since they were looked up
1536  *
1537  * If there was a race and the children changed since they were first looked
1538  * up, it is possible that mds_verify_child() will be able to just grab the
1539  * lock on the new child resource (if it has a higher resource than any other)
1540  * but we need to compare against not only its parent, but also against the
1541  * parent and child of the "other half" of the rename, hence maxres_{src,tgt}.
1542  *
1543  * We need the fancy igrab() on the child inodes because we aren't holding a
1544  * lock on the parent after the lookup is done, so dentry->d_inode may change
1545  * at any time, and igrab() itself doesn't like getting passed a NULL argument.
1546  */
1547 static int mds_get_parents_children_locked(struct obd_device *obd,
1548                                            struct mds_obd *mds,
1549                                            struct ll_fid *p1_fid,
1550                                            struct dentry **de_srcdirp,
1551                                            struct ll_fid *p2_fid,
1552                                            struct dentry **de_tgtdirp,
1553                                            int parent_mode,
1554                                            const char *old_name, int old_len,
1555                                            struct dentry **de_oldp,
1556                                            const char *new_name, int new_len,
1557                                            struct dentry **de_newp,
1558                                            struct lustre_handle *dlm_handles,
1559                                            int child_mode)
1560 {
1561         struct ldlm_res_id p1_res_id = { .name = {0} };
1562         struct ldlm_res_id p2_res_id = { .name = {0} };
1563         struct ldlm_res_id c1_res_id = { .name = {0} };
1564         struct ldlm_res_id c2_res_id = { .name = {0} };
1565         struct ldlm_res_id *maxres_src, *maxres_tgt;
1566         struct inode *inode;
1567         int rc = 0, cleanup_phase = 0;
1568         ENTRY;
1569
1570         /* Step 1: Lookup the source directory */
1571         *de_srcdirp = mds_fid2dentry(mds, p1_fid, NULL);
1572         if (IS_ERR(*de_srcdirp))
1573                 GOTO(cleanup, rc = PTR_ERR(*de_srcdirp));
1574
1575         cleanup_phase = 1; /* source directory dentry */
1576
1577         p1_res_id.name[0] = (*de_srcdirp)->d_inode->i_ino;
1578         p1_res_id.name[1] = (*de_srcdirp)->d_inode->i_generation;
1579
1580         /* Step 2: Lookup the target directory */
1581         if (memcmp(p1_fid, p2_fid, sizeof(*p1_fid)) == 0) {
1582                 *de_tgtdirp = dget(*de_srcdirp);
1583         } else {
1584                 *de_tgtdirp = mds_fid2dentry(mds, p2_fid, NULL);
1585                 if (IS_ERR(*de_tgtdirp)) {
1586                         rc = PTR_ERR(*de_tgtdirp);
1587                         *de_tgtdirp = NULL;
1588                         GOTO(cleanup, rc);
1589                 }
1590         }
1591
1592         cleanup_phase = 2; /* target directory dentry */
1593
1594         p2_res_id.name[0] = (*de_tgtdirp)->d_inode->i_ino;
1595         p2_res_id.name[1] = (*de_tgtdirp)->d_inode->i_generation;
1596
1597         /* Step 3: Lookup the source child entry */
1598         *de_oldp = ll_lookup_one_len(old_name, *de_srcdirp, old_len - 1);
1599         if (IS_ERR(*de_oldp)) {
1600                 rc = PTR_ERR(*de_oldp);
1601                 CERROR("old child lookup error (%.*s): %d\n",
1602                        old_len - 1, old_name, rc);
1603                 GOTO(cleanup, rc);
1604         }
1605
1606         cleanup_phase = 3; /* original name dentry */
1607
1608         inode = (*de_oldp)->d_inode;
1609         if (inode != NULL)
1610                 inode = igrab(inode);
1611         if (inode == NULL)
1612                 GOTO(cleanup, rc = -ENOENT);
1613
1614         c1_res_id.name[0] = inode->i_ino;
1615         c1_res_id.name[1] = inode->i_generation;
1616
1617         iput(inode);
1618
1619         /* Step 4: Lookup the target child entry */
1620         *de_newp = ll_lookup_one_len(new_name, *de_tgtdirp, new_len - 1);
1621         if (IS_ERR(*de_newp)) {
1622                 rc = PTR_ERR(*de_newp);
1623                 CERROR("new child lookup error (%.*s): %d\n",
1624                        old_len - 1, old_name, rc);
1625                 GOTO(cleanup, rc);
1626         }
1627
1628         cleanup_phase = 4; /* target dentry */
1629
1630         inode = (*de_newp)->d_inode;
1631         if (inode != NULL)
1632                 inode = igrab(inode);
1633         if (inode == NULL)
1634                 goto retry_locks;
1635
1636         c2_res_id.name[0] = inode->i_ino;
1637         c2_res_id.name[1] = inode->i_generation;
1638         iput(inode);
1639
1640 retry_locks:
1641         /* Step 5: Take locks on the parents and child(ren) */
1642         maxres_src = &p1_res_id;
1643         maxres_tgt = &p2_res_id;
1644         cleanup_phase = 4; /* target dentry */
1645
1646         if (c1_res_id.name[0] != 0 && res_gt(&c1_res_id, &p1_res_id))
1647                 maxres_src = &c1_res_id;
1648         if (c2_res_id.name[0] != 0 && res_gt(&c2_res_id, &p2_res_id))
1649                 maxres_tgt = &c2_res_id;
1650
1651         rc = enqueue_4ordered_locks(obd, &p1_res_id,&dlm_handles[0],parent_mode,
1652                                     &p2_res_id, &dlm_handles[1], parent_mode,
1653                                     &c1_res_id, &dlm_handles[2], child_mode,
1654                                     &c2_res_id, &dlm_handles[3], child_mode);
1655         if (rc)
1656                 GOTO(cleanup, rc);
1657
1658         cleanup_phase = 6; /* parent and child(ren) locks */
1659
1660         /* Step 6a: Re-lookup source child to verify it hasn't changed */
1661         rc = mds_verify_child(obd, &p1_res_id, &dlm_handles[0], *de_srcdirp,
1662                               parent_mode, &c1_res_id, &dlm_handles[2], de_oldp,
1663                               child_mode, old_name, old_len, maxres_tgt);
1664         if (rc) {
1665                 if (c2_res_id.name[0] != 0)
1666                         ldlm_lock_decref(&dlm_handles[3], child_mode);
1667                 ldlm_lock_decref(&dlm_handles[1], parent_mode);
1668                 cleanup_phase = 4;
1669                 if (rc > 0)
1670                         goto retry_locks;
1671                 GOTO(cleanup, rc);
1672         }
1673
1674         if ((*de_oldp)->d_inode == NULL)
1675                 GOTO(cleanup, rc = -ENOENT);
1676
1677         /* Step 6b: Re-lookup target child to verify it hasn't changed */
1678         rc = mds_verify_child(obd, &p2_res_id, &dlm_handles[1], *de_tgtdirp,
1679                               parent_mode, &c2_res_id, &dlm_handles[3], de_newp,
1680                               child_mode, new_name, new_len, maxres_src);
1681         if (rc) {
1682                 ldlm_lock_decref(&dlm_handles[2], child_mode);
1683                 ldlm_lock_decref(&dlm_handles[0], parent_mode);
1684                 cleanup_phase = 4;
1685                 if (rc > 0)
1686                         goto retry_locks;
1687                 GOTO(cleanup, rc);
1688         }
1689
1690         EXIT;
1691 cleanup:
1692         if (rc) {
1693                 switch (cleanup_phase) {
1694                 case 6: /* child lock(s) */
1695                         if (c2_res_id.name[0] != 0)
1696                                 ldlm_lock_decref(&dlm_handles[3], child_mode);
1697                         if (c1_res_id.name[0] != 0)
1698                                 ldlm_lock_decref(&dlm_handles[2], child_mode);
1699                 case 5: /* parent locks */
1700                         ldlm_lock_decref(&dlm_handles[1], parent_mode);
1701                         ldlm_lock_decref(&dlm_handles[0], parent_mode);
1702                 case 4: /* target dentry */
1703                         l_dput(*de_newp);
1704                 case 3: /* source dentry */
1705                         l_dput(*de_oldp);
1706                 case 2: /* target directory dentry */
1707                         l_dput(*de_tgtdirp);
1708                 case 1: /* source directry dentry */
1709                         l_dput(*de_srcdirp);
1710                 }
1711         }
1712
1713         return rc;
1714 }
1715
1716 static int mds_reint_rename(struct mds_update_record *rec, int offset,
1717                             struct ptlrpc_request *req,
1718                             struct lustre_handle *lockh)
1719 {
1720         struct obd_device *obd = req->rq_export->exp_obd;
1721         struct dentry *de_srcdir = NULL;
1722         struct dentry *de_tgtdir = NULL;
1723         struct dentry *de_old = NULL;
1724         struct dentry *de_new = NULL;
1725         struct inode *old_inode = NULL, *new_inode = NULL;
1726         struct mds_obd *mds = mds_req2mds(req);
1727         struct lustre_handle dlm_handles[4];
1728         struct mds_body *body = NULL;
1729         struct lov_mds_md *lmm = NULL;
1730         int rc = 0, lock_count = 3, cleanup_phase = 0;
1731         void *handle = NULL;
1732         ENTRY;
1733
1734         LASSERT(offset == 0);
1735
1736         DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u %s to "LPU64"/%u %s",
1737                   rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_name,
1738                   rec->ur_fid2->id, rec->ur_fid2->generation, rec->ur_tgt);
1739
1740         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1741
1742         rc = mds_get_parents_children_locked(obd, mds, rec->ur_fid1, &de_srcdir,
1743                                              rec->ur_fid2, &de_tgtdir, LCK_PW,
1744                                              rec->ur_name, rec->ur_namelen,
1745                                              &de_old, rec->ur_tgt,
1746                                              rec->ur_tgtlen, &de_new,
1747                                              dlm_handles, LCK_EX);
1748         if (rc)
1749                 GOTO(cleanup, rc);
1750
1751         cleanup_phase = 1; /* parent(s), children, locks */
1752
1753         old_inode = de_old->d_inode;
1754         new_inode = de_new->d_inode;
1755
1756         if (new_inode != NULL)
1757                 lock_count = 4;
1758
1759         /* sanity check for src inode */
1760         if (old_inode->i_ino == de_srcdir->d_inode->i_ino ||
1761             old_inode->i_ino == de_tgtdir->d_inode->i_ino)
1762                 GOTO(cleanup, rc = -EINVAL);
1763
1764         if (new_inode == NULL)
1765                 goto no_unlink;
1766
1767         igrab(new_inode);
1768         cleanup_phase = 2; /* iput(new_inode) when finished */
1769
1770         /* sanity check for dest inode */
1771         if (new_inode->i_ino == de_srcdir->d_inode->i_ino ||
1772             new_inode->i_ino == de_tgtdir->d_inode->i_ino)
1773                 GOTO(cleanup, rc = -EINVAL);
1774
1775         if (old_inode == new_inode)
1776                 GOTO(cleanup, rc = 0);
1777
1778         /* if we are about to remove the target at first, pass the EA of
1779          * that inode to client to perform and cleanup on OST */
1780         body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
1781         LASSERT(body != NULL);
1782
1783         /* child orphan sem protects orphan_dec_test && is_orphan race */
1784         MDS_DOWN_READ_ORPHAN_SEM(new_inode);
1785         cleanup_phase = 3; /* MDS_UP_READ_ORPHAN_SEM(new_inode) when finished */
1786
1787         if ((S_ISDIR(new_inode->i_mode) && new_inode->i_nlink == 2) ||
1788             new_inode->i_nlink == 1) {
1789                 if (mds_orphan_open_count(new_inode) > 0) {
1790                         /* need to lock pending_dir before transaction */
1791                         down(&mds->mds_pending_dir->d_inode->i_sem);
1792                         cleanup_phase = 4; /* up(&pending_dir->i_sem) */
1793                 } else if (S_ISREG(new_inode->i_mode)) {
1794                         mds_pack_inode2fid(&body->fid1, new_inode);
1795                         mds_pack_inode2body(body, new_inode);
1796                         mds_pack_md(obd, req->rq_repmsg, 1, body, new_inode,
1797                                     MDS_PACK_MD_LOCK);
1798                 }
1799         }
1800
1801 no_unlink:
1802         OBD_FAIL_WRITE(OBD_FAIL_MDS_REINT_RENAME_WRITE,
1803                        de_srcdir->d_inode->i_sb);
1804
1805 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
1806         /* Check if we are moving old entry into its child. 2.6 does not
1807            check for this in vfs_rename() anymore */
1808         if (is_subdir(de_new, de_old))
1809                 GOTO(cleanup, rc = -EINVAL);
1810 #endif
1811
1812         lmm = lustre_msg_buf(req->rq_repmsg, 1, 0);
1813         handle = fsfilt_start_log(obd, de_tgtdir->d_inode, FSFILT_OP_RENAME,
1814                                   NULL, le32_to_cpu(lmm->lmm_stripe_count));
1815
1816         if (IS_ERR(handle))
1817                 GOTO(cleanup, rc = PTR_ERR(handle));
1818
1819         lock_kernel();
1820         de_old->d_fsdata = req;
1821         de_new->d_fsdata = req;
1822
1823         rc = vfs_rename(de_srcdir->d_inode, de_old, de_tgtdir->d_inode, de_new);
1824         unlock_kernel();
1825
1826         if (rc == 0 && new_inode != NULL && new_inode->i_nlink == 0) {
1827                 if (mds_orphan_open_count(new_inode) > 0)
1828                         rc = mds_orphan_add_link(rec, obd, de_new);
1829
1830                 if (rc == 1)
1831                         GOTO(cleanup, rc = 0);
1832
1833                 if (!S_ISREG(new_inode->i_mode))
1834                         GOTO(cleanup, rc);
1835
1836                 if (!(body->valid & OBD_MD_FLEASIZE)) {
1837                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1838                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
1839                 } else if (mds_log_op_unlink(obd, new_inode,
1840                                              lustre_msg_buf(req->rq_repmsg,1,0),
1841                                              req->rq_repmsg->buflens[1],
1842                                              lustre_msg_buf(req->rq_repmsg,2,0),
1843                                              req->rq_repmsg->buflens[2]) > 0) {
1844                         body->valid |= OBD_MD_FLCOOKIE;
1845                 }
1846         }
1847
1848         GOTO(cleanup, rc);
1849 cleanup:
1850         rc = mds_finish_transno(mds, de_tgtdir ? de_tgtdir->d_inode : NULL,
1851                                 handle, req, rc, 0);
1852
1853         switch (cleanup_phase) {
1854         case 4:
1855                 up(&mds->mds_pending_dir->d_inode->i_sem);
1856         case 3:
1857                 MDS_UP_READ_ORPHAN_SEM(new_inode);
1858         case 2:
1859                 iput(new_inode);
1860         case 1:
1861                 if (rc) {
1862                         if (lock_count == 4)
1863                                 ldlm_lock_decref(&(dlm_handles[3]), LCK_EX);
1864                         ldlm_lock_decref(&(dlm_handles[2]), LCK_EX);
1865                         ldlm_lock_decref(&(dlm_handles[1]), LCK_PW);
1866                         ldlm_lock_decref(&(dlm_handles[0]), LCK_PW);
1867                 } else {
1868                         if (lock_count == 4)
1869                                 ptlrpc_save_lock(req,&(dlm_handles[3]), LCK_EX);
1870                         ptlrpc_save_lock(req, &(dlm_handles[2]), LCK_EX);
1871                         ptlrpc_save_lock(req, &(dlm_handles[1]), LCK_PW);
1872                         ptlrpc_save_lock(req, &(dlm_handles[0]), LCK_PW);
1873                 }
1874                 l_dput(de_new);
1875                 l_dput(de_old);
1876                 l_dput(de_tgtdir);
1877                 l_dput(de_srcdir);
1878         case 0:
1879                 break;
1880         default:
1881                 CERROR("invalid cleanup_phase %d\n", cleanup_phase);
1882                 LBUG();
1883         }
1884         req->rq_status = rc;
1885         return 0;
1886 }
1887
1888 typedef int (*mds_reinter)(struct mds_update_record *, int offset,
1889                            struct ptlrpc_request *, struct lustre_handle *);
1890
1891 static mds_reinter reinters[REINT_MAX + 1] = {
1892         [REINT_SETATTR] mds_reint_setattr,
1893         [REINT_CREATE] mds_reint_create,
1894         [REINT_LINK] mds_reint_link,
1895         [REINT_UNLINK] mds_reint_unlink,
1896         [REINT_RENAME] mds_reint_rename,
1897         [REINT_OPEN] mds_open
1898 };
1899
1900 int mds_reint_rec(struct mds_update_record *rec, int offset,
1901                   struct ptlrpc_request *req, struct lustre_handle *lockh)
1902 {
1903         struct obd_device *obd = req->rq_export->exp_obd;
1904         struct obd_run_ctxt saved;
1905         int rc;
1906         ENTRY;
1907
1908         /* checked by unpacker */
1909         LASSERT(rec->ur_opcode <= REINT_MAX &&
1910                 reinters[rec->ur_opcode] != NULL);
1911
1912         push_ctxt(&saved, &obd->obd_ctxt, &rec->ur_uc);
1913         rc = reinters[rec->ur_opcode] (rec, offset, req, lockh);
1914         pop_ctxt(&saved, &obd->obd_ctxt, &rec->ur_uc);
1915
1916         RETURN(rc);
1917 }