lustre/llite/namei.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #include <linux/fs.h>
  38 #include <linux/sched.h>
  39 #include <linux/mm.h>
  40 #include <linux/quotaops.h>
  41 #include <linux/highmem.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/security.h>
  44
  45 #define DEBUG_SUBSYSTEM S_LLITE
  46
  47 #include <obd_support.h>
  48 #include <lustre_fid.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_ver.h>
  51 #include "llite_internal.h"
  52
  53 static int ll_create_it(struct inode *dir, struct dentry *dentry,
  54                         struct lookup_intent *it);
  55
  56 /* called from iget5_locked->find_inode() under inode_lock spinlock */
  57 static int ll_test_inode(struct inode *inode, void *opaque)
  58 {
  59         struct ll_inode_info    *lli = ll_i2info(inode);
  60         struct lustre_md        *md = opaque;
  61
  62         if (unlikely(!(md->body->mbo_valid & OBD_MD_FLID))) {
  63                 CERROR("MDS body missing FID\n");
  64                 return 0;
  65         }
  66
  67         if (!lu_fid_eq(&lli->lli_fid, &md->body->mbo_fid1))
  68                 return 0;
  69
  70         return 1;
  71 }
  72
  73 static int ll_set_inode(struct inode *inode, void *opaque)
  74 {
  75         struct ll_inode_info *lli = ll_i2info(inode);
  76         struct mdt_body *body = ((struct lustre_md *)opaque)->body;
  77
  78         if (unlikely(!(body->mbo_valid & OBD_MD_FLID))) {
  79                 CERROR("MDS body missing FID\n");
  80                 return -EINVAL;
  81         }
  82
  83         lli->lli_fid = body->mbo_fid1;
  84         if (unlikely(!(body->mbo_valid & OBD_MD_FLTYPE))) {
  85                 CERROR("Can not initialize inode "DFID" without object type: "
  86                        "valid = "LPX64"\n",
  87                        PFID(&lli->lli_fid), body->mbo_valid);
  88                 return -EINVAL;
  89         }
  90
  91         inode->i_mode = (inode->i_mode & ~S_IFMT) | (body->mbo_mode & S_IFMT);
  92         if (unlikely(inode->i_mode == 0)) {
  93                 CERROR("Invalid inode "DFID" type\n", PFID(&lli->lli_fid));
  94                 return -EINVAL;
  95         }
  96
  97         ll_lli_init(lli);
  98
  99         return 0;
 100 }
 101
 102
 103 /**
 104  * Get an inode by inode number(@hash), which is already instantiated by
 105  * the intent lookup).
 106  */
 107 struct inode *ll_iget(struct super_block *sb, ino_t hash,
 108                       struct lustre_md *md)
 109 {
 110         struct inode    *inode;
 111         int             rc = 0;
 112
 113         ENTRY;
 114
 115         LASSERT(hash != 0);
 116         inode = iget5_locked(sb, hash, ll_test_inode, ll_set_inode, md);
 117         if (inode == NULL)
 118                 RETURN(ERR_PTR(-ENOMEM));
 119
 120         if (inode->i_state & I_NEW) {
 121                 rc = ll_read_inode2(inode, md);
 122                 if (rc == 0 && S_ISREG(inode->i_mode) &&
 123                     ll_i2info(inode)->lli_clob == NULL) {
 124                         CDEBUG(D_INODE, "%s: apply lsm %p to inode "DFID"\n",
 125                                 ll_get_fsname(sb, NULL, 0), md->lsm,
 126                                 PFID(ll_inode2fid(inode)));
 127                         rc = cl_file_inode_init(inode, md);
 128                 }
 129                 if (rc != 0) {
 130                         make_bad_inode(inode);
 131                         unlock_new_inode(inode);
 132                         iput(inode);
 133                         inode = ERR_PTR(rc);
 134                 } else {
 135                         unlock_new_inode(inode);
 136                 }
 137         } else if (!(inode->i_state & (I_FREEING | I_CLEAR))) {
 138                 rc = ll_update_inode(inode, md);
 139                 CDEBUG(D_VFSTRACE, "got inode: "DFID"(%p): rc = %d\n",
 140                        PFID(&md->body->mbo_fid1), inode, rc);
 141                 if (rc != 0) {
 142                         iput(inode);
 143                         inode = ERR_PTR(rc);
 144                 }
 145         }
 146
 147         RETURN(inode);
 148 }
 149
 150 static void ll_invalidate_negative_children(struct inode *dir)
 151 {
 152         struct dentry *dentry, *tmp_subdir;
 153         DECLARE_LL_D_HLIST_NODE_PTR(p);
 154
 155         ll_lock_dcache(dir);
 156         ll_d_hlist_for_each_entry(dentry, p, &dir->i_dentry, d_alias) {
 157                 spin_lock(&dentry->d_lock);
 158                 if (!list_empty(&dentry->d_subdirs)) {
 159                         struct dentry *child;
 160
 161                         list_for_each_entry_safe(child, tmp_subdir,
 162                                                  &dentry->d_subdirs,
 163                                                  d_u.d_child) {
 164                                 if (child->d_inode == NULL)
 165                                         d_lustre_invalidate(child, 1);
 166                         }
 167                 }
 168                 spin_unlock(&dentry->d_lock);
 169         }
 170         ll_unlock_dcache(dir);
 171 }
 172
 173 int ll_test_inode_by_fid(struct inode *inode, void *opaque)
 174 {
 175         return lu_fid_eq(&ll_i2info(inode)->lli_fid, opaque);
 176 }
 177
 178 int ll_md_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 179                        void *data, int flag)
 180 {
 181         struct lustre_handle lockh;
 182         int rc;
 183         ENTRY;
 184
 185         switch (flag) {
 186         case LDLM_CB_BLOCKING:
 187                 ldlm_lock2handle(lock, &lockh);
 188                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
 189                 if (rc < 0) {
 190                         CDEBUG(D_INODE, "ldlm_cli_cancel: rc = %d\n", rc);
 191                         RETURN(rc);
 192                 }
 193                 break;
 194         case LDLM_CB_CANCELING: {
 195                 struct inode *inode = ll_inode_from_resource_lock(lock);
 196                 __u64 bits = lock->l_policy_data.l_inodebits.bits;
 197
 198                 /* Inode is set to lock->l_resource->lr_lvb_inode
 199                  * for mdc - bug 24555 */
 200                 LASSERT(lock->l_ast_data == NULL);
 201
 202                 if (inode == NULL)
 203                         break;
 204
 205                 /* Invalidate all dentries associated with this inode */
 206                 LASSERT(ldlm_is_canceling(lock));
 207
 208                 if (!fid_res_name_eq(ll_inode2fid(inode),
 209                                      &lock->l_resource->lr_name)) {
 210                         LDLM_ERROR(lock, "data mismatch with object "DFID"(%p)",
 211                                    PFID(ll_inode2fid(inode)), inode);
 212                         LBUG();
 213                 }
 214
 215                 if (bits & MDS_INODELOCK_XATTR) {
 216                         ll_xattr_cache_destroy(inode);
 217                         bits &= ~MDS_INODELOCK_XATTR;
 218                 }
 219
 220                 /* For OPEN locks we differentiate between lock modes
 221                  * LCK_CR, LCK_CW, LCK_PR - bug 22891 */
 222                 if (bits & MDS_INODELOCK_OPEN)
 223                         ll_have_md_lock(inode, &bits, lock->l_req_mode);
 224
 225                 if (bits & MDS_INODELOCK_OPEN) {
 226                         fmode_t fmode;
 227
 228                         switch (lock->l_req_mode) {
 229                         case LCK_CW:
 230                                 fmode = FMODE_WRITE;
 231                                 break;
 232                         case LCK_PR:
 233                                 fmode = FMODE_EXEC;
 234                                 break;
 235                         case LCK_CR:
 236                                 fmode = FMODE_READ;
 237                                 break;
 238                         default:
 239                                 LDLM_ERROR(lock, "bad lock mode for OPEN lock");
 240                                 LBUG();
 241                         }
 242
 243                         ll_md_real_close(inode, fmode);
 244
 245                         bits &= ~MDS_INODELOCK_OPEN;
 246                 }
 247
 248                 if (bits & (MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
 249                             MDS_INODELOCK_LAYOUT | MDS_INODELOCK_PERM))
 250                         ll_have_md_lock(inode, &bits, LCK_MINMODE);
 251
 252                 if (bits & MDS_INODELOCK_LAYOUT) {
 253                         struct cl_object_conf conf = {
 254                                 .coc_opc = OBJECT_CONF_INVALIDATE,
 255                                 .coc_inode = inode,
 256                         };
 257
 258                         rc = ll_layout_conf(inode, &conf);
 259                         if (rc < 0)
 260                                 CDEBUG(D_INODE, "cannot invalidate layout of "
 261                                        DFID": rc = %d\n",
 262                                        PFID(ll_inode2fid(inode)), rc);
 263                 }
 264
 265                 if (bits & MDS_INODELOCK_UPDATE) {
 266                         struct ll_inode_info *lli = ll_i2info(inode);
 267
 268                         spin_lock(&lli->lli_lock);
 269                         lli->lli_flags &= ~LLIF_MDS_SIZE_LOCK;
 270                         spin_unlock(&lli->lli_lock);
 271                 }
 272
 273                 if ((bits & MDS_INODELOCK_UPDATE) && S_ISDIR(inode->i_mode)) {
 274                         struct ll_inode_info *lli = ll_i2info(inode);
 275
 276                         CDEBUG(D_INODE, "invalidating inode "DFID" lli = %p, "
 277                                "pfid  = "DFID"\n", PFID(ll_inode2fid(inode)),
 278                                lli, PFID(&lli->lli_pfid));
 279                         truncate_inode_pages(inode->i_mapping, 0);
 280
 281                         if (unlikely(!fid_is_zero(&lli->lli_pfid))) {
 282                                 struct inode *master_inode = NULL;
 283                                 unsigned long hash;
 284
 285                                 /* This is slave inode, since all of the child
 286                                  * dentry is connected on the master inode, so
 287                                  * we have to invalidate the negative children
 288                                  * on master inode */
 289                                 CDEBUG(D_INODE, "Invalidate s"DFID" m"DFID"\n",
 290                                        PFID(ll_inode2fid(inode)),
 291                                        PFID(&lli->lli_pfid));
 292
 293                                 hash = cl_fid_build_ino(&lli->lli_pfid,
 294                                         ll_need_32bit_api(ll_i2sbi(inode)));
 295
 296                                 master_inode = ilookup5(inode->i_sb, hash,
 297                                                         ll_test_inode_by_fid,
 298                                                         (void *)&lli->lli_pfid);
 299                                 if (master_inode != NULL &&
 300                                         !IS_ERR(master_inode)) {
 301                                         ll_invalidate_negative_children(
 302                                                                 master_inode);
 303                                         iput(master_inode);
 304                                 }
 305                         } else {
 306                                 ll_invalidate_negative_children(inode);
 307                         }
 308                 }
 309
 310                 if ((bits & (MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM)) &&
 311                     inode->i_sb->s_root != NULL &&
 312                     inode != inode->i_sb->s_root->d_inode)
 313                         ll_invalidate_aliases(inode);
 314
 315                 iput(inode);
 316                 break;
 317         }
 318         default:
 319                 LBUG();
 320         }
 321
 322         RETURN(0);
 323 }
 324
 325 __u32 ll_i2suppgid(struct inode *i)
 326 {
 327         if (in_group_p(i->i_gid))
 328                 return (__u32)from_kgid(&init_user_ns, i->i_gid);
 329         else
 330                 return (__u32) __kgid_val(INVALID_GID);
 331 }
 332
 333 /* Pack the required supplementary groups into the supplied groups array.
 334  * If we don't need to use the groups from the target inode(s) then we
 335  * instead pack one or more groups from the user's supplementary group
 336  * array in case it might be useful.  Not needed if doing an MDS-side upcall. */
 337 void ll_i2gids(__u32 *suppgids, struct inode *i1, struct inode *i2)
 338 {
 339         LASSERT(i1 != NULL);
 340         LASSERT(suppgids != NULL);
 341
 342         suppgids[0] = ll_i2suppgid(i1);
 343
 344         if (i2)
 345                 suppgids[1] = ll_i2suppgid(i2);
 346         else
 347                 suppgids[1] = -1;
 348 }
 349
 350 /*
 351  * try to reuse three types of dentry:
 352  * 1. unhashed alias, this one is unhashed by d_invalidate (but it may be valid
 353  *    by concurrent .revalidate).
 354  * 2. INVALID alias (common case for no valid ldlm lock held, but this flag may
 355  *    be cleared by others calling d_lustre_revalidate).
 356  * 3. DISCONNECTED alias.
 357  */
 358 static struct dentry *ll_find_alias(struct inode *inode, struct dentry *dentry)
 359 {
 360         struct dentry *alias, *discon_alias, *invalid_alias;
 361         DECLARE_LL_D_HLIST_NODE_PTR(p);
 362
 363         if (ll_d_hlist_empty(&inode->i_dentry))
 364                 return NULL;
 365
 366         discon_alias = invalid_alias = NULL;
 367
 368         ll_lock_dcache(inode);
 369         ll_d_hlist_for_each_entry(alias, p, &inode->i_dentry, d_alias) {
 370                 LASSERT(alias != dentry);
 371
 372                 spin_lock(&alias->d_lock);
 373                 if (alias->d_flags & DCACHE_DISCONNECTED)
 374                         /* LASSERT(last_discon == NULL); LU-405, bz 20055 */
 375                         discon_alias = alias;
 376                 else if (alias->d_parent == dentry->d_parent             &&
 377                          alias->d_name.hash == dentry->d_name.hash       &&
 378                          alias->d_name.len == dentry->d_name.len         &&
 379                          memcmp(alias->d_name.name, dentry->d_name.name,
 380                                 dentry->d_name.len) == 0)
 381                         invalid_alias = alias;
 382                 spin_unlock(&alias->d_lock);
 383
 384                 if (invalid_alias)
 385                         break;
 386         }
 387         alias = invalid_alias ?: discon_alias ?: NULL;
 388         if (alias) {
 389                 spin_lock(&alias->d_lock);
 390                 dget_dlock(alias);
 391                 spin_unlock(&alias->d_lock);
 392         }
 393         ll_unlock_dcache(inode);
 394
 395         return alias;
 396 }
 397
 398 /*
 399  * Similar to d_splice_alias(), but lustre treats invalid alias
 400  * similar to DCACHE_DISCONNECTED, and tries to use it anyway.
 401  */
 402 struct dentry *ll_splice_alias(struct inode *inode, struct dentry *de)
 403 {
 404         struct dentry *new;
 405         int rc;
 406
 407         if (inode) {
 408                 new = ll_find_alias(inode, de);
 409                 if (new) {
 410                         rc = ll_d_init(new);
 411                         if (rc < 0) {
 412                                 dput(new);
 413                                 return ERR_PTR(rc);
 414                         }
 415                         d_move(new, de);
 416                         iput(inode);
 417                         CDEBUG(D_DENTRY,
 418                                "Reuse dentry %p inode %p refc %d flags %#x\n",
 419                               new, new->d_inode, ll_d_count(new), new->d_flags);
 420                         return new;
 421                 }
 422         }
 423         rc = ll_d_init(de);
 424         if (rc < 0)
 425                 return ERR_PTR(rc);
 426         d_add(de, inode);
 427         CDEBUG(D_DENTRY, "Add dentry %p inode %p refc %d flags %#x\n",
 428                de, de->d_inode, ll_d_count(de), de->d_flags);
 429         return de;
 430 }
 431
 432 static int ll_lookup_it_finish(struct ptlrpc_request *request,
 433                                struct lookup_intent *it,
 434                                struct inode *parent, struct dentry **de)
 435 {
 436         struct inode             *inode = NULL;
 437         __u64                     bits = 0;
 438         int                       rc;
 439         ENTRY;
 440
 441         /* NB 1 request reference will be taken away by ll_intent_lock()
 442          * when I return */
 443         CDEBUG(D_DENTRY, "it %p it_disposition %x\n", it,
 444                it->d.lustre.it_disposition);
 445         if (!it_disposition(it, DISP_LOOKUP_NEG)) {
 446                 rc = ll_prep_inode(&inode, request, (*de)->d_sb, it);
 447                 if (rc)
 448                         RETURN(rc);
 449
 450                 ll_set_lock_data(ll_i2sbi(parent)->ll_md_exp, inode, it, &bits);
 451
 452                 /* We used to query real size from OSTs here, but actually
 453                    this is not needed. For stat() calls size would be updated
 454                    from subsequent do_revalidate()->ll_inode_revalidate_it() in
 455                    2.4 and
 456                    vfs_getattr_it->ll_getattr()->ll_inode_revalidate_it() in 2.6
 457                    Everybody else who needs correct file size would call
 458                    ll_glimpse_size or some equivalent themselves anyway.
 459                    Also see bug 7198. */
 460         }
 461
 462         /* Only hash *de if it is unhashed (new dentry).
 463          * Atoimc_open may passin hashed dentries for open.
 464          */
 465         if (d_unhashed(*de)) {
 466                 struct dentry *alias;
 467
 468                 alias = ll_splice_alias(inode, *de);
 469                 if (IS_ERR(alias))
 470                         RETURN(PTR_ERR(alias));
 471                 *de = alias;
 472         } else if (!it_disposition(it, DISP_LOOKUP_NEG)  &&
 473                    !it_disposition(it, DISP_OPEN_CREATE)) {
 474                 /* With DISP_OPEN_CREATE dentry will
 475                    instantiated in ll_create_it. */
 476                 LASSERT((*de)->d_inode == NULL);
 477                 d_instantiate(*de, inode);
 478         }
 479
 480         if (!it_disposition(it, DISP_LOOKUP_NEG)) {
 481                 /* we have lookup look - unhide dentry */
 482                 if (bits & MDS_INODELOCK_LOOKUP)
 483                         d_lustre_revalidate(*de);
 484         } else if (!it_disposition(it, DISP_OPEN_CREATE)) {
 485                 /* If file created on server, don't depend on parent UPDATE
 486                  * lock to unhide it. It is left hidden and next lookup can
 487                  * find it in ll_splice_alias.
 488                  */
 489                 /* Check that parent has UPDATE lock. */
 490                 struct lookup_intent parent_it = {
 491                                         .it_op = IT_GETATTR,
 492                                         .d.lustre.it_lock_handle = 0 };
 493                 struct lu_fid   fid = ll_i2info(parent)->lli_fid;
 494
 495                 /* If it is striped directory, get the real stripe parent */
 496                 if (unlikely(ll_i2info(parent)->lli_lsm_md != NULL)) {
 497                         rc = md_get_fid_from_lsm(ll_i2mdexp(parent),
 498                                                  ll_i2info(parent)->lli_lsm_md,
 499                                                  (*de)->d_name.name,
 500                                                  (*de)->d_name.len, &fid);
 501                         if (rc != 0)
 502                                 RETURN(rc);
 503                 }
 504
 505                 if (md_revalidate_lock(ll_i2mdexp(parent), &parent_it, &fid,
 506                                        NULL)) {
 507                         d_lustre_revalidate(*de);
 508                         ll_intent_release(&parent_it);
 509                 }
 510         }
 511
 512         RETURN(0);
 513 }
 514
 515 static struct dentry *ll_lookup_it(struct inode *parent, struct dentry *dentry,
 516                                    struct lookup_intent *it)
 517 {
 518         struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
 519         struct dentry *save = dentry, *retval;
 520         struct ptlrpc_request *req = NULL;
 521         struct md_op_data *op_data = NULL;
 522         __u32 opc;
 523         int rc;
 524         ENTRY;
 525
 526         if (dentry->d_name.len > ll_i2sbi(parent)->ll_namelen)
 527                 RETURN(ERR_PTR(-ENAMETOOLONG));
 528
 529         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p), intent=%s\n",
 530                dentry->d_name.len, dentry->d_name.name,
 531                PFID(ll_inode2fid(parent)), parent, LL_IT2STR(it));
 532
 533         if (d_mountpoint(dentry))
 534                 CERROR("Tell Peter, lookup on mtpt, it %s\n", LL_IT2STR(it));
 535
 536         if (it == NULL || it->it_op == IT_GETXATTR)
 537                 it = &lookup_it;
 538
 539         if (it->it_op == IT_GETATTR && dentry_may_statahead(parent, dentry)) {
 540                 rc = ll_statahead(parent, &dentry, 0);
 541                 if (rc == 1)
 542                         RETURN(dentry == save ? NULL : dentry);
 543         }
 544
 545         if (it->it_op & IT_CREAT)
 546                 opc = LUSTRE_OPC_CREATE;
 547         else
 548                 opc = LUSTRE_OPC_ANY;
 549
 550         op_data = ll_prep_md_op_data(NULL, parent, NULL, dentry->d_name.name,
 551                                      dentry->d_name.len, 0, opc, NULL);
 552         if (IS_ERR(op_data))
 553                 RETURN((void *)op_data);
 554
 555         /* enforce umask if acl disabled or MDS doesn't support umask */
 556         if (!IS_POSIXACL(parent) || !exp_connect_umask(ll_i2mdexp(parent)))
 557                 it->it_create_mode &= ~current_umask();
 558
 559         rc = md_intent_lock(ll_i2mdexp(parent), op_data, it, &req,
 560                             &ll_md_blocking_ast, 0);
 561         /* If the MDS allows the client to chgrp (CFS_SETGRP_PERM), but the
 562          * client does not know which suppgid should be sent to the MDS, or
 563          * some other(s) changed the target file's GID after this RPC sent
 564          * to the MDS with the suppgid as the original GID, then we should
 565          * try again with right suppgid. */
 566         if (rc == -EACCES && it->it_op & IT_OPEN &&
 567             it_disposition(it, DISP_OPEN_DENY)) {
 568                 struct mdt_body *body;
 569
 570                 LASSERT(req != NULL);
 571
 572                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 573                 if (op_data->op_suppgids[0] == body->mbo_gid ||
 574                     op_data->op_suppgids[1] == body->mbo_gid ||
 575                     !in_group_p(make_kgid(&init_user_ns, body->mbo_gid)))
 576                         GOTO(out, retval = ERR_PTR(-EACCES));
 577
 578                 fid_zero(&op_data->op_fid2);
 579                 op_data->op_suppgids[1] = body->mbo_gid;
 580                 ptlrpc_req_finished(req);
 581                 req = NULL;
 582                 ll_intent_release(it);
 583                 rc = md_intent_lock(ll_i2mdexp(parent), op_data, it, &req,
 584                                     &ll_md_blocking_ast, 0);
 585         }
 586
 587         if (rc < 0)
 588                 GOTO(out, retval = ERR_PTR(rc));
 589
 590         rc = ll_lookup_it_finish(req, it, parent, &dentry);
 591         if (rc != 0) {
 592                 ll_intent_release(it);
 593                 GOTO(out, retval = ERR_PTR(rc));
 594         }
 595
 596         if ((it->it_op & IT_OPEN) && dentry->d_inode &&
 597             !S_ISREG(dentry->d_inode->i_mode) &&
 598             !S_ISDIR(dentry->d_inode->i_mode)) {
 599                 ll_release_openhandle(dentry, it);
 600         }
 601         ll_lookup_finish_locks(it, dentry);
 602
 603         GOTO(out, retval = (dentry == save) ? NULL : dentry);
 604
 605 out:
 606         if (op_data != NULL && !IS_ERR(op_data))
 607                 ll_finish_md_op_data(op_data);
 608
 609         ptlrpc_req_finished(req);
 610         return retval;
 611 }
 612
 613 #ifdef HAVE_IOP_ATOMIC_OPEN
 614 static struct dentry *ll_lookup_nd(struct inode *parent, struct dentry *dentry,
 615                                    unsigned int flags)
 616 {
 617         struct lookup_intent *itp, it = { .it_op = IT_GETATTR };
 618         struct dentry *de;
 619
 620         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p), flags=%u\n",
 621                dentry->d_name.len, dentry->d_name.name,
 622                PFID(ll_inode2fid(parent)), parent, flags);
 623
 624         /* Optimize away (CREATE && !OPEN). Let .create handle the race. */
 625         if ((flags & LOOKUP_CREATE) && !(flags & LOOKUP_OPEN))
 626                 return NULL;
 627
 628         if (flags & (LOOKUP_PARENT|LOOKUP_OPEN|LOOKUP_CREATE))
 629                 itp = NULL;
 630         else
 631                 itp = &it;
 632         de = ll_lookup_it(parent, dentry, itp);
 633
 634         if (itp != NULL)
 635                 ll_intent_release(itp);
 636
 637         return de;
 638 }
 639
 640 /*
 641  * For cached negative dentry and new dentry, handle lookup/create/open
 642  * together.
 643  */
 644 static int ll_atomic_open(struct inode *dir, struct dentry *dentry,
 645                           struct file *file, unsigned open_flags,
 646                           umode_t mode, int *opened)
 647 {
 648         struct lookup_intent *it;
 649         struct dentry *de;
 650         long long lookup_flags = LOOKUP_OPEN;
 651         int rc = 0;
 652         ENTRY;
 653
 654         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p), file %p,"
 655                            "open_flags %x, mode %x opened %d\n",
 656                dentry->d_name.len, dentry->d_name.name,
 657                PFID(ll_inode2fid(dir)), dir, file, open_flags, mode, *opened);
 658
 659         OBD_ALLOC(it, sizeof(*it));
 660         if (!it)
 661                 RETURN(-ENOMEM);
 662
 663         it->it_op = IT_OPEN;
 664         if (open_flags & O_CREAT) {
 665                 it->it_op |= IT_CREAT;
 666                 lookup_flags |= LOOKUP_CREATE;
 667         }
 668         it->it_create_mode = (mode & S_IALLUGO) | S_IFREG;
 669         it->it_flags = (open_flags & ~O_ACCMODE) | OPEN_FMODE(open_flags);
 670         it->it_flags &= ~MDS_OPEN_FL_INTERNAL;
 671
 672         /* Dentry added to dcache tree in ll_lookup_it */
 673         de = ll_lookup_it(dir, dentry, it);
 674         if (IS_ERR(de))
 675                 rc = PTR_ERR(de);
 676         else if (de != NULL)
 677                 dentry = de;
 678
 679         if (!rc) {
 680                 if (it_disposition(it, DISP_OPEN_CREATE)) {
 681                         /* Dentry instantiated in ll_create_it. */
 682                         rc = ll_create_it(dir, dentry, it);
 683                         if (rc) {
 684                                 /* We dget in ll_splice_alias. */
 685                                 if (de != NULL)
 686                                         dput(de);
 687                                 goto out_release;
 688                         }
 689
 690                         *opened |= FILE_CREATED;
 691                 }
 692                 if (dentry->d_inode && it_disposition(it, DISP_OPEN_OPEN)) {
 693                         /* Open dentry. */
 694                         if (S_ISFIFO(dentry->d_inode->i_mode)) {
 695                                 /* We cannot call open here as it would
 696                                  * deadlock.
 697                                  */
 698                                 if (it_disposition(it, DISP_ENQ_OPEN_REF))
 699                                         ptlrpc_req_finished(
 700                                                        (struct ptlrpc_request *)
 701                                                           it->d.lustre.it_data);
 702                                 rc = finish_no_open(file, de);
 703                         } else {
 704                                 file->private_data = it;
 705                                 rc = finish_open(file, dentry, NULL, opened);
 706                                 /* We dget in ll_splice_alias. finish_open takes
 707                                  * care of dget for fd open.
 708                                  */
 709                                 if (de != NULL)
 710                                         dput(de);
 711                         }
 712                 } else {
 713                         rc = finish_no_open(file, de);
 714                 }
 715         }
 716
 717 out_release:
 718         ll_intent_release(it);
 719         OBD_FREE(it, sizeof(*it));
 720
 721         RETURN(rc);
 722 }
 723
 724 #else /* !HAVE_IOP_ATOMIC_OPEN */
 725 static struct lookup_intent *
 726 ll_convert_intent(struct open_intent *oit, int lookup_flags)
 727 {
 728         struct lookup_intent *it;
 729
 730         OBD_ALLOC_PTR(it);
 731         if (!it)
 732                 return ERR_PTR(-ENOMEM);
 733
 734         if (lookup_flags & LOOKUP_OPEN) {
 735                 it->it_op = IT_OPEN;
 736                 if (lookup_flags & LOOKUP_CREATE)
 737                         it->it_op |= IT_CREAT;
 738                 it->it_create_mode = (oit->create_mode & S_IALLUGO) | S_IFREG;
 739                 it->it_flags = ll_namei_to_lookup_intent_flag(oit->flags);
 740                 it->it_flags &= ~MDS_OPEN_FL_INTERNAL;
 741         } else {
 742                 it->it_op = IT_GETATTR;
 743         }
 744
 745         return it;
 746 }
 747
 748 static struct dentry *ll_lookup_nd(struct inode *parent, struct dentry *dentry,
 749                                    struct nameidata *nd)
 750 {
 751         struct dentry *de;
 752         ENTRY;
 753
 754         if (nd && !(nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT))) {
 755                 struct lookup_intent *it;
 756
 757                 if (ll_d2d(dentry) && ll_d2d(dentry)->lld_it) {
 758                         it = ll_d2d(dentry)->lld_it;
 759                         ll_d2d(dentry)->lld_it = NULL;
 760                 } else {
 761                         if ((nd->flags & LOOKUP_CREATE) &&
 762                             !(nd->flags & LOOKUP_OPEN))
 763                                 RETURN(NULL);
 764
 765                         it = ll_convert_intent(&nd->intent.open, nd->flags);
 766                         if (IS_ERR(it))
 767                                 RETURN((struct dentry *)it);
 768                 }
 769
 770                 de = ll_lookup_it(parent, dentry, it);
 771                 if (de)
 772                         dentry = de;
 773                 if ((nd->flags & LOOKUP_OPEN) && !IS_ERR(dentry)) { /* Open */
 774                         if (dentry->d_inode &&
 775                             it_disposition(it, DISP_OPEN_OPEN)) { /* nocreate */
 776                                 if (S_ISFIFO(dentry->d_inode->i_mode)) {
 777                                         // We cannot call open here as it would
 778                                         // deadlock.
 779                                         ptlrpc_req_finished(
 780                                                        (struct ptlrpc_request *)
 781                                                           it->d.lustre.it_data);
 782                                 } else {
 783                                         struct file *filp;
 784
 785                                         nd->intent.open.file->private_data = it;
 786                                         filp = lookup_instantiate_filp(nd,
 787                                                                        dentry,
 788                                                                        NULL);
 789                                         if (IS_ERR(filp)) {
 790                                                 if (de)
 791                                                         dput(de);
 792                                                 de = (struct dentry *)filp;
 793                                         }
 794                                 }
 795                         } else if (it_disposition(it, DISP_OPEN_CREATE)) {
 796                                 // XXX This can only reliably work on assumption
 797                                 // that there are NO hashed negative dentries.
 798                                 ll_d2d(dentry)->lld_it = it;
 799                                 it = NULL; /* Will be freed in ll_create_nd */
 800                                 /* We absolutely depend on ll_create_nd to be
 801                                  * called to not leak this intent and possible
 802                                  * data attached to it */
 803                         }
 804                 }
 805
 806                 if (it) {
 807                         ll_intent_release(it);
 808                         OBD_FREE(it, sizeof(*it));
 809                 }
 810         } else {
 811                 de = ll_lookup_it(parent, dentry, NULL);
 812         }
 813
 814         RETURN(de);
 815 }
 816 #endif /* HAVE_IOP_ATOMIC_OPEN */
 817
 818 /* We depend on "mode" being set with the proper file type/umask by now */
 819 static struct inode *ll_create_node(struct inode *dir, struct lookup_intent *it)
 820 {
 821         struct inode *inode = NULL;
 822         struct ptlrpc_request *request = NULL;
 823         struct ll_sb_info *sbi = ll_i2sbi(dir);
 824         int rc;
 825         ENTRY;
 826
 827         LASSERT(it && it->d.lustre.it_disposition);
 828
 829         LASSERT(it_disposition(it, DISP_ENQ_CREATE_REF));
 830         request = it->d.lustre.it_data;
 831         it_clear_disposition(it, DISP_ENQ_CREATE_REF);
 832         rc = ll_prep_inode(&inode, request, dir->i_sb, it);
 833         if (rc)
 834                 GOTO(out, inode = ERR_PTR(rc));
 835
 836         LASSERT(ll_d_hlist_empty(&inode->i_dentry));
 837
 838         /* We asked for a lock on the directory, but were granted a
 839          * lock on the inode.  Since we finally have an inode pointer,
 840          * stuff it in the lock. */
 841         CDEBUG(D_DLMTRACE, "setting l_ast_data to inode "DFID"(%p)\n",
 842                PFID(ll_inode2fid(inode)), inode);
 843         ll_set_lock_data(sbi->ll_md_exp, inode, it, NULL);
 844         EXIT;
 845  out:
 846         ptlrpc_req_finished(request);
 847         return inode;
 848 }
 849
 850 /*
 851  * By the time this is called, we already have created the directory cache
 852  * entry for the new file, but it is so far negative - it has no inode.
 853  *
 854  * We defer creating the OBD object(s) until open, to keep the intent and
 855  * non-intent code paths similar, and also because we do not have the MDS
 856  * inode number before calling ll_create_node() (which is needed for LOV),
 857  * so we would need to do yet another RPC to the MDS to store the LOV EA
 858  * data on the MDS.  If needed, we would pass the PACKED lmm as data and
 859  * lmm_size in datalen (the MDS still has code which will handle that).
 860  *
 861  * If the create succeeds, we fill in the inode information
 862  * with d_instantiate().
 863  */
 864 static int ll_create_it(struct inode *dir, struct dentry *dentry,
 865                         struct lookup_intent *it)
 866 {
 867         struct inode *inode;
 868         int rc = 0;
 869         ENTRY;
 870
 871         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p), intent=%s\n",
 872                dentry->d_name.len, dentry->d_name.name,
 873                PFID(ll_inode2fid(dir)), dir, LL_IT2STR(it));
 874
 875         rc = it_open_error(DISP_OPEN_CREATE, it);
 876         if (rc)
 877                 RETURN(rc);
 878
 879         inode = ll_create_node(dir, it);
 880         if (IS_ERR(inode))
 881                 RETURN(PTR_ERR(inode));
 882
 883         d_instantiate(dentry, inode);
 884         RETURN(0);
 885 }
 886
 887 void ll_update_times(struct ptlrpc_request *request, struct inode *inode)
 888 {
 889         struct mdt_body *body = req_capsule_server_get(&request->rq_pill,
 890                                                        &RMF_MDT_BODY);
 891
 892         LASSERT(body);
 893         if (body->mbo_valid & OBD_MD_FLMTIME &&
 894             body->mbo_mtime > LTIME_S(inode->i_mtime)) {
 895                 CDEBUG(D_INODE, "setting fid "DFID" mtime from %lu to "LPU64
 896                        "\n", PFID(ll_inode2fid(inode)),
 897                        LTIME_S(inode->i_mtime), body->mbo_mtime);
 898                 LTIME_S(inode->i_mtime) = body->mbo_mtime;
 899         }
 900
 901         if (body->mbo_valid & OBD_MD_FLCTIME &&
 902             body->mbo_ctime > LTIME_S(inode->i_ctime))
 903                 LTIME_S(inode->i_ctime) = body->mbo_ctime;
 904 }
 905
 906 static int ll_new_node(struct inode *dir, struct dentry *dchild,
 907                        const char *tgt, umode_t mode, int rdev, __u32 opc)
 908 {
 909         struct qstr *name = &dchild->d_name;
 910         struct ptlrpc_request *request = NULL;
 911         struct md_op_data *op_data;
 912         struct inode *inode = NULL;
 913         struct ll_sb_info *sbi = ll_i2sbi(dir);
 914         int tgt_len = 0;
 915         int err;
 916
 917         ENTRY;
 918         if (unlikely(tgt != NULL))
 919                 tgt_len = strlen(tgt) + 1;
 920
 921         op_data = ll_prep_md_op_data(NULL, dir, NULL, name->name,
 922                                      name->len, 0, opc, NULL);
 923         if (IS_ERR(op_data))
 924                 GOTO(err_exit, err = PTR_ERR(op_data));
 925
 926         err = md_create(sbi->ll_md_exp, op_data, tgt, tgt_len, mode,
 927                         from_kuid(&init_user_ns, current_fsuid()),
 928                         from_kgid(&init_user_ns, current_fsgid()),
 929                         cfs_curproc_cap_pack(), rdev, &request);
 930         ll_finish_md_op_data(op_data);
 931         if (err)
 932                 GOTO(err_exit, err);
 933
 934         ll_update_times(request, dir);
 935
 936         err = ll_prep_inode(&inode, request, dchild->d_sb, NULL);
 937         if (err)
 938                 GOTO(err_exit, err);
 939
 940         d_instantiate(dchild, inode);
 941
 942         EXIT;
 943 err_exit:
 944         ptlrpc_req_finished(request);
 945
 946         return err;
 947 }
 948
 949 static int ll_mknod(struct inode *dir, struct dentry *dchild, ll_umode_t mode,
 950                     dev_t rdev)
 951 {
 952         struct qstr *name = &dchild->d_name;
 953         int err;
 954         ENTRY;
 955
 956         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p) mode %o dev %x\n",
 957                name->len, name->name, PFID(ll_inode2fid(dir)), dir,
 958                mode, rdev);
 959
 960         if (!IS_POSIXACL(dir) || !exp_connect_umask(ll_i2mdexp(dir)))
 961                 mode &= ~current_umask();
 962
 963         switch (mode & S_IFMT) {
 964         case 0:
 965                 mode |= S_IFREG; /* for mode = 0 case, fallthrough */
 966         case S_IFREG:
 967         case S_IFCHR:
 968         case S_IFBLK:
 969         case S_IFIFO:
 970         case S_IFSOCK:
 971                 err = ll_new_node(dir, dchild, NULL, mode, old_encode_dev(rdev),
 972                                   LUSTRE_OPC_MKNOD);
 973                 break;
 974         case S_IFDIR:
 975                 err = -EPERM;
 976                 break;
 977         default:
 978                 err = -EINVAL;
 979         }
 980
 981         if (!err)
 982                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_MKNOD, 1);
 983
 984         RETURN(err);
 985 }
 986
 987 #ifdef HAVE_IOP_ATOMIC_OPEN
 988 /*
 989  * Plain create. Intent create is handled in atomic_open.
 990  */
 991 static int ll_create_nd(struct inode *dir, struct dentry *dentry,
 992                         umode_t mode, bool want_excl)
 993 {
 994         int rc;
 995
 996         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p), "
 997                            "flags=%u, excl=%d\n", dentry->d_name.len,
 998                dentry->d_name.name, PFID(ll_inode2fid(dir)),
 999                dir, mode, want_excl);
1000
1001         rc = ll_mknod(dir, dentry, mode, 0);
1002
1003         ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_CREATE, 1);
1004
1005         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, unhashed %d\n",
1006                dentry->d_name.len, dentry->d_name.name, d_unhashed(dentry));
1007
1008         return rc;
1009 }
1010 #else /* !HAVE_IOP_ATOMIC_OPEN */
1011 static int ll_create_nd(struct inode *dir, struct dentry *dentry,
1012                         ll_umode_t mode, struct nameidata *nd)
1013 {
1014         struct ll_dentry_data *lld = ll_d2d(dentry);
1015         struct lookup_intent *it = NULL;
1016         int rc;
1017
1018         if (lld != NULL)
1019                 it = lld->lld_it;
1020
1021         if (!it)
1022                 return ll_mknod(dir, dentry, mode, 0);
1023
1024         lld->lld_it = NULL;
1025
1026         /* Was there an error? Propagate it! */
1027         if (it->d.lustre.it_status) {
1028                 rc = it->d.lustre.it_status;
1029                 goto out;
1030         }
1031
1032         rc = ll_create_it(dir, dentry, it);
1033         if (nd && (nd->flags & LOOKUP_OPEN) && dentry->d_inode) { /* Open */
1034                 struct file *filp;
1035
1036                 nd->intent.open.file->private_data = it;
1037                 filp = lookup_instantiate_filp(nd, dentry, NULL);
1038                 if (IS_ERR(filp))
1039                         rc = PTR_ERR(filp);
1040         }
1041
1042 out:
1043         ll_intent_release(it);
1044         OBD_FREE(it, sizeof(*it));
1045
1046         if (!rc)
1047                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_CREATE, 1);
1048
1049         return rc;
1050 }
1051 #endif /* HAVE_IOP_ATOMIC_OPEN */
1052
1053 static int ll_symlink(struct inode *dir, struct dentry *dchild,
1054                       const char *oldpath)
1055 {
1056         struct qstr *name = &dchild->d_name;
1057         int err;
1058         ENTRY;
1059
1060         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p), target=%.*s\n",
1061                name->len, name->name, PFID(ll_inode2fid(dir)),
1062                dir, 3000, oldpath);
1063
1064         err = ll_new_node(dir, dchild, oldpath, S_IFLNK | S_IRWXUGO, 0,
1065                           LUSTRE_OPC_SYMLINK);
1066
1067         if (!err)
1068                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_SYMLINK, 1);
1069
1070         RETURN(err);
1071 }
1072
1073 static int ll_link(struct dentry *old_dentry, struct inode *dir,
1074                    struct dentry *new_dentry)
1075 {
1076         struct inode *src = old_dentry->d_inode;
1077         struct qstr *name = &new_dentry->d_name;
1078         struct ll_sb_info *sbi = ll_i2sbi(dir);
1079         struct ptlrpc_request *request = NULL;
1080         struct md_op_data *op_data;
1081         int err;
1082
1083         ENTRY;
1084         CDEBUG(D_VFSTRACE, "VFS Op: inode="DFID"(%p), dir="DFID"(%p), "
1085                "target=%.*s\n", PFID(ll_inode2fid(src)), src,
1086                PFID(ll_inode2fid(dir)), dir, name->len, name->name);
1087
1088         op_data = ll_prep_md_op_data(NULL, src, dir, name->name, name->len,
1089                                      0, LUSTRE_OPC_ANY, NULL);
1090         if (IS_ERR(op_data))
1091                 RETURN(PTR_ERR(op_data));
1092
1093         err = md_link(sbi->ll_md_exp, op_data, &request);
1094         ll_finish_md_op_data(op_data);
1095         if (err)
1096                 GOTO(out, err);
1097
1098         ll_update_times(request, dir);
1099         ll_stats_ops_tally(sbi, LPROC_LL_LINK, 1);
1100         EXIT;
1101 out:
1102         ptlrpc_req_finished(request);
1103         RETURN(err);
1104 }
1105
1106 static int ll_mkdir(struct inode *dir, struct dentry *dchild, ll_umode_t mode)
1107 {
1108         struct qstr *name = &dchild->d_name;
1109         int err;
1110         ENTRY;
1111
1112         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p)\n",
1113                name->len, name->name, PFID(ll_inode2fid(dir)), dir);
1114
1115         if (!IS_POSIXACL(dir) || !exp_connect_umask(ll_i2mdexp(dir)))
1116                 mode &= ~current_umask();
1117
1118         mode = (mode & (S_IRWXUGO|S_ISVTX)) | S_IFDIR;
1119
1120         err = ll_new_node(dir, dchild, NULL, mode, 0, LUSTRE_OPC_MKDIR);
1121         if (err == 0)
1122                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_MKDIR, 1);
1123
1124         RETURN(err);
1125 }
1126
1127 static int ll_rmdir(struct inode *dir, struct dentry *dchild)
1128 {
1129         struct qstr *name = &dchild->d_name;
1130         struct ptlrpc_request *request = NULL;
1131         struct md_op_data *op_data;
1132         int rc;
1133         ENTRY;
1134
1135         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p)\n",
1136                name->len, name->name, PFID(ll_inode2fid(dir)), dir);
1137
1138         if (unlikely(d_mountpoint(dchild)))
1139                 RETURN(-EBUSY);
1140
1141         op_data = ll_prep_md_op_data(NULL, dir, NULL, name->name, name->len,
1142                                      S_IFDIR, LUSTRE_OPC_ANY, NULL);
1143         if (IS_ERR(op_data))
1144                 RETURN(PTR_ERR(op_data));
1145
1146         if (dchild->d_inode != NULL)
1147                 op_data->op_fid3 = *ll_inode2fid(dchild->d_inode);
1148
1149         op_data->op_fid2 = op_data->op_fid3;
1150         rc = md_unlink(ll_i2sbi(dir)->ll_md_exp, op_data, &request);
1151         ll_finish_md_op_data(op_data);
1152         if (rc == 0) {
1153                 ll_update_times(request, dir);
1154                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_RMDIR, 1);
1155         }
1156
1157         ptlrpc_req_finished(request);
1158         RETURN(rc);
1159 }
1160
1161 /**
1162  * Remove dir entry
1163  **/
1164 int ll_rmdir_entry(struct inode *dir, char *name, int namelen)
1165 {
1166         struct ptlrpc_request *request = NULL;
1167         struct md_op_data *op_data;
1168         int rc;
1169         ENTRY;
1170
1171         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p)\n",
1172                namelen, name, PFID(ll_inode2fid(dir)), dir);
1173
1174         op_data = ll_prep_md_op_data(NULL, dir, NULL, name, strlen(name),
1175                                      S_IFDIR, LUSTRE_OPC_ANY, NULL);
1176         if (IS_ERR(op_data))
1177                 RETURN(PTR_ERR(op_data));
1178         op_data->op_cli_flags |= CLI_RM_ENTRY;
1179         rc = md_unlink(ll_i2sbi(dir)->ll_md_exp, op_data, &request);
1180         ll_finish_md_op_data(op_data);
1181         if (rc == 0) {
1182                 ll_update_times(request, dir);
1183                 ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_RMDIR, 1);
1184         }
1185
1186         ptlrpc_req_finished(request);
1187         RETURN(rc);
1188 }
1189
1190 /* ll_unlink() doesn't update the inode with the new link count.
1191  * Instead, ll_ddelete() and ll_d_iput() will update it based upon if
1192  * there is any lock existing. They will recycle dentries and inodes
1193  * based upon locks too. b=20433 */
1194 static int ll_unlink(struct inode *dir, struct dentry *dchild)
1195 {
1196         struct qstr *name = &dchild->d_name;
1197         struct ptlrpc_request *request = NULL;
1198         struct md_op_data *op_data;
1199         int rc;
1200         ENTRY;
1201         CDEBUG(D_VFSTRACE, "VFS Op:name=%.*s, dir="DFID"(%p)\n",
1202                name->len, name->name, PFID(ll_inode2fid(dir)), dir);
1203
1204         /*
1205          * XXX: unlink bind mountpoint maybe call to here,
1206          * just check it as vfs_unlink does.
1207          */
1208         if (unlikely(d_mountpoint(dchild)))
1209                 RETURN(-EBUSY);
1210
1211         op_data = ll_prep_md_op_data(NULL, dir, NULL, name->name, name->len, 0,
1212                                      LUSTRE_OPC_ANY, NULL);
1213         if (IS_ERR(op_data))
1214                 RETURN(PTR_ERR(op_data));
1215
1216         if (dchild->d_inode != NULL)
1217                 op_data->op_fid3 = *ll_inode2fid(dchild->d_inode);
1218
1219         op_data->op_fid2 = op_data->op_fid3;
1220         rc = md_unlink(ll_i2sbi(dir)->ll_md_exp, op_data, &request);
1221         ll_finish_md_op_data(op_data);
1222         if (rc)
1223                 GOTO(out, rc);
1224
1225         ll_update_times(request, dir);
1226         ll_stats_ops_tally(ll_i2sbi(dir), LPROC_LL_UNLINK, 1);
1227
1228  out:
1229         ptlrpc_req_finished(request);
1230         RETURN(rc);
1231 }
1232
1233 static int ll_rename(struct inode *src, struct dentry *src_dchild,
1234                      struct inode *tgt, struct dentry *tgt_dchild)
1235 {
1236         struct qstr *src_name = &src_dchild->d_name;
1237         struct qstr *tgt_name = &tgt_dchild->d_name;
1238         struct ptlrpc_request *request = NULL;
1239         struct ll_sb_info *sbi = ll_i2sbi(src);
1240         struct md_op_data *op_data;
1241         int err;
1242         ENTRY;
1243         CDEBUG(D_VFSTRACE, "VFS Op:oldname=%.*s, src_dir="DFID
1244                "(%p), newname=%.*s, tgt_dir="DFID"(%p)\n",
1245                src_name->len, src_name->name,
1246                PFID(ll_inode2fid(src)), src, tgt_name->len,
1247                tgt_name->name, PFID(ll_inode2fid(tgt)), tgt);
1248
1249         if (unlikely(d_mountpoint(src_dchild) || d_mountpoint(tgt_dchild)))
1250                 RETURN(-EBUSY);
1251
1252         op_data = ll_prep_md_op_data(NULL, src, tgt, NULL, 0, 0,
1253                                      LUSTRE_OPC_ANY, NULL);
1254         if (IS_ERR(op_data))
1255                 RETURN(PTR_ERR(op_data));
1256
1257         if (src_dchild->d_inode != NULL)
1258                 op_data->op_fid3 = *ll_inode2fid(src_dchild->d_inode);
1259
1260         if (tgt_dchild->d_inode != NULL)
1261                 op_data->op_fid4 = *ll_inode2fid(tgt_dchild->d_inode);
1262
1263         err = md_rename(sbi->ll_md_exp, op_data,
1264                         src_name->name, src_name->len,
1265                         tgt_name->name, tgt_name->len, &request);
1266         ll_finish_md_op_data(op_data);
1267         if (!err) {
1268                 ll_update_times(request, src);
1269                 ll_update_times(request, tgt);
1270                 ll_stats_ops_tally(sbi, LPROC_LL_RENAME, 1);
1271         }
1272
1273         ptlrpc_req_finished(request);
1274
1275         if (err == 0)
1276                 d_move(src_dchild, tgt_dchild);
1277
1278         RETURN(err);
1279 }
1280
1281 const struct inode_operations ll_dir_inode_operations = {
1282         .mknod              = ll_mknod,
1283 #ifdef HAVE_IOP_ATOMIC_OPEN
1284         .atomic_open        = ll_atomic_open,
1285 #endif
1286         .lookup             = ll_lookup_nd,
1287         .create             = ll_create_nd,
1288         /* We need all these non-raw things for NFSD, to not patch it. */
1289         .unlink             = ll_unlink,
1290         .mkdir              = ll_mkdir,
1291         .rmdir              = ll_rmdir,
1292         .symlink            = ll_symlink,
1293         .link               = ll_link,
1294         .rename             = ll_rename,
1295         .setattr            = ll_setattr,
1296         .getattr            = ll_getattr,
1297         .permission         = ll_inode_permission,
1298         .setxattr           = ll_setxattr,
1299         .getxattr           = ll_getxattr,
1300         .listxattr          = ll_listxattr,
1301         .removexattr        = ll_removexattr,
1302 #ifdef HAVE_IOP_GET_ACL
1303         .get_acl            = ll_get_acl,
1304 #endif
1305 };
1306
1307 const struct inode_operations ll_special_inode_operations = {
1308         .setattr        = ll_setattr,
1309         .getattr        = ll_getattr,
1310         .permission     = ll_inode_permission,
1311         .setxattr       = ll_setxattr,
1312         .getxattr       = ll_getxattr,
1313         .listxattr      = ll_listxattr,
1314         .removexattr    = ll_removexattr,
1315 #ifdef HAVE_IOP_GET_ACL
1316         .get_acl            = ll_get_acl,
1317 #endif
1318 };