lustre/llite/namei.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * This code is issued under the GNU General Public License.
   5  * See the file COPYING in this distribution
   6  *
   7  * Copyright (C) 1992, 1993, 1994, 1995
   8  * Remy Card (card@masi.ibp.fr)
   9  * Laboratoire MASI - Institut Blaise Pascal
  10  * Universite Pierre et Marie Curie (Paris VI)
  11  *
  12  *  from
  13  *
  14  *  linux/fs/ext2/namei.c
  15  *
  16  *  Copyright (C) 1991, 1992  Linus Torvalds
  17  *
  18  *  Big-endian to little-endian byte-swapping/bitmaps by
  19  *        David S. Miller (davem@caip.rutgers.edu), 1995
  20  *  Directory entry file type support and forward compatibility hooks
  21  *      for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
  22  *
  23  *  Changes for use in OBDFS
  24  *  Copyright (c) 1999, Seagate Technology Inc.
  25  *  Copyright (C) 2001, Cluster File Systems, Inc.
  26  *                       Rewritten based on recent ext2 page cache use.
  27  *
  28  */
  29
  30 #include <linux/fs.h>
  31 #include <linux/locks.h>
  32 #include <linux/quotaops.h>
  33
  34 #define DEBUG_SUBSYSTEM S_LLITE
  35
  36 #include <linux/obd_support.h>
  37 #include <linux/lustre_lite.h>
  38 #include <linux/lustre_dlm.h>
  39 #include <linux/obd_lov.h>
  40
  41 extern struct address_space_operations ll_aops;
  42
  43 /* from super.c */
  44 extern void ll_change_inode(struct inode *inode);
  45 extern int ll_setattr(struct dentry *de, struct iattr *attr);
  46
  47 /* from dir.c */
  48 extern int ll_add_link (struct dentry *dentry, struct inode *inode);
  49 obd_id ll_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
  50 int ext2_make_empty(struct inode *inode, struct inode *parent);
  51 struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
  52                    struct dentry *dentry, struct page ** res_page);
  53 int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
  54 int ext2_empty_dir (struct inode * inode);
  55 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
  56 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
  57                    struct page *page, struct inode *inode);
  58
  59 /*
  60  * Couple of helper functions - make the code slightly cleaner.
  61  */
  62 static inline void ext2_inc_count(struct inode *inode)
  63 {
  64         inode->i_nlink++;
  65 }
  66
  67 /* postpone the disk update until the inode really goes away */
  68 static inline void ext2_dec_count(struct inode *inode)
  69 {
  70         inode->i_nlink--;
  71 }
  72
  73 static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
  74 {
  75         int err;
  76         err = ll_add_link(dentry, inode);
  77         if (!err) {
  78                 d_instantiate(dentry, inode);
  79                 return 0;
  80         }
  81         ext2_dec_count(inode);
  82         iput(inode);
  83         return err;
  84 }
  85
  86 /* methods */
  87 static int ll_find_inode(struct inode *inode, unsigned long ino, void *opaque)
  88 {
  89         struct ll_read_inode2_cookie *lic = opaque;
  90
  91         if (inode->i_generation != lic->lic_body->generation)
  92                 return 0;
  93
  94         return 1;
  95 }
  96
  97 extern struct dentry_operations ll_d_ops;
  98
  99 int ll_lock(struct inode *dir, struct dentry *dentry,
 100             struct lookup_intent *it, struct lustre_handle *lockh)
 101 {
 102         struct ll_sb_info *sbi = ll_i2sbi(dir);
 103         char *tgt = NULL;
 104         int tgtlen = 0;
 105         int err, lock_mode;
 106
 107         if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SETATTR | IT_MKNOD)))
 108                 lock_mode = LCK_PW;
 109         else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
 110                               IT_RMDIR | IT_RENAME | IT_RENAME2 | IT_READLINK))
 111                 lock_mode = LCK_PR;
 112         else if (it->it_op & IT_SYMLINK) {
 113                 lock_mode = LCK_PW;
 114                 tgt = it->it_data;
 115                 tgtlen = strlen(tgt);
 116                 it->it_data = NULL;
 117         } else if (it->it_op & IT_LOOKUP)
 118                 lock_mode = LCK_CR;
 119         else {
 120                 LBUG();
 121                 RETURN(-EINVAL);
 122         }
 123
 124         err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT, it, lock_mode, dir,
 125                           dentry, lockh, tgt, tgtlen, dir, sizeof(*dir));
 126
 127         RETURN(err);
 128 }
 129
 130 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
 131 {
 132         ENTRY;
 133
 134         ldlm_lock_decref(lockh, mode);
 135
 136         RETURN(0);
 137 }
 138
 139 static struct dentry *ll_lookup2(struct inode *dir, struct dentry *dentry,
 140                                  struct lookup_intent *it)
 141 {
 142         struct ptlrpc_request *request = NULL;
 143         struct inode * inode = NULL;
 144         struct ll_sb_info *sbi = ll_i2sbi(dir);
 145         struct ll_read_inode2_cookie lic;
 146         struct lustre_handle lockh;
 147         struct lookup_intent lookup_it = { IT_LOOKUP };
 148         int err, offset;
 149         obd_id ino = 0;
 150
 151         ENTRY;
 152
 153         if (it == NULL) {
 154                 it = &lookup_it;
 155                 dentry->d_it = it;
 156         }
 157
 158         CDEBUG(D_INFO, "name: %*s, intent op: %d\n", dentry->d_name.len,
 159                dentry->d_name.name, it->it_op);
 160
 161         if (dentry->d_name.len > EXT2_NAME_LEN)
 162                 RETURN(ERR_PTR(-ENAMETOOLONG));
 163
 164         err = ll_lock(dir, dentry, it, &lockh);
 165         if (err < 0)
 166                 RETURN(ERR_PTR(err));
 167         memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
 168
 169         request = (struct ptlrpc_request *)it->it_data;
 170         if (it->it_disposition) {
 171                 int mode, symlen = 0;
 172                 obd_flag valid;
 173
 174                 offset = 1;
 175                 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
 176                         /* For create ops, we want the lookup to be negative */
 177                         if (!it->it_status)
 178                                 GOTO(negative, NULL);
 179                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP)) {
 180                         /* For check ops, we want the lookup to succeed */
 181                         it->it_data = NULL;
 182                         if (it->it_status)
 183                                 GOTO(neg_req, NULL);
 184                 } else if (it->it_op & IT_RENAME) {
 185                         /* For rename, we want the lookup to succeed */
 186                         if (it->it_status) {
 187                                 it->it_data = NULL;
 188                                 GOTO(neg_req, NULL);
 189                         }
 190                         it->it_data = dentry;
 191                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 192                         /* For remove ops, we want the lookup to succeed */
 193                         it->it_data = NULL;
 194                         if (it->it_status)
 195                                 GOTO(neg_req, NULL);
 196                         goto iget;
 197                 } else if (it->it_op == IT_OPEN) {
 198                         it->it_data = NULL;
 199                         if (it->it_status && it->it_status != -EEXIST)
 200                                 GOTO(neg_req, NULL);
 201                 } else if (it->it_op == IT_RENAME2) {
 202                         struct mds_body *body =
 203                                 lustre_msg_buf(request->rq_repmsg, offset);
 204                         it->it_data = NULL;
 205                         /* For rename2, this means the lookup is negative */
 206                         if (body->valid == 0)
 207                                 GOTO(neg_req, NULL);
 208                         goto iget; /* XXX not sure about this */
 209                 }
 210
 211                 /* Do a getattr now that we have the lock */
 212                 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 213                 ino = lic.lic_body->fid1.id;
 214                 mode = lic.lic_body->mode;
 215                 valid = OBD_MD_FLNOTOBD | OBD_MD_FLEASIZE;
 216                 if (it->it_op == IT_READLINK) {
 217                         valid |= OBD_MD_LINKNAME;
 218                         symlen = lic.lic_body->size;
 219                 }
 220                 ptlrpc_free_req(request);
 221                 request = NULL;
 222                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 223                                   valid, symlen, &request);
 224                 if (err) {
 225                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 226                         ptlrpc_free_req(request);
 227 #warning FIXME: must release lock here
 228                         RETURN(ERR_PTR(-abs(err)));
 229                 }
 230                 offset = 0;
 231         } else {
 232                 struct ll_inode_info *lli = ll_i2info(dir);
 233                 int type;
 234
 235                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 236                 offset = 0;
 237
 238                 ino = ll_inode_by_name(dir, dentry, &type);
 239 #warning FIXME: handle negative inode case (see old ll_lookup)
 240
 241                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, type,
 242                                   OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 243                 if (err) {
 244                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 245                         ptlrpc_free_req(request);
 246 #warning FIXME: must release lock here
 247                         RETURN(ERR_PTR(-abs(err)));
 248                 }
 249         }
 250
 251  iget:
 252         lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 253         if (S_ISREG(lic.lic_body->mode)) {
 254                 LASSERT(request->rq_repmsg->bufcount > offset);
 255                 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
 256                 if (lic.lic_lmm->lmm_magic != LOV_MAGIC)
 257                         lic.lic_lmm = NULL;
 258         } else
 259                 lic.lic_lmm = NULL;
 260
 261         /* No rpc's happen during iget4, -ENOMEM's are possible */
 262         inode = iget4(dir->i_sb, ino, ll_find_inode, &lic);
 263
 264         LASSERT(!IS_ERR(inode));
 265         if (!inode) {
 266                 ptlrpc_free_req(request);
 267                 ll_intent_release(dentry);
 268                 RETURN(ERR_PTR(-ENOMEM));
 269         }
 270
 271         EXIT;
 272  neg_req:
 273         ptlrpc_req_finished(request);
 274  negative:
 275         dentry->d_op = &ll_d_ops;
 276         d_add(dentry, inode);
 277         if (it->it_op == IT_LOOKUP)
 278                 ll_intent_release(dentry);
 279
 280         return NULL;
 281 }
 282
 283 static struct inode *ll_create_node(struct inode *dir, const char *name,
 284                                     int namelen, const char *tgt, int tgtlen,
 285                                     int mode, __u64 extra,
 286                                     struct lookup_intent *it,
 287                                     struct lov_stripe_md *lsm)
 288 {
 289         struct inode *inode;
 290         struct ptlrpc_request *request = NULL;
 291         struct mds_body *body;
 292         int rc;
 293         time_t time = CURRENT_TIME;
 294         struct ll_sb_info *sbi = ll_i2sbi(dir);
 295         int gid = current->fsgid;
 296         struct ll_read_inode2_cookie lic;
 297         struct lov_mds_md *lmm = NULL;
 298         int mds_md_size = 0;
 299
 300         ENTRY;
 301
 302         if (dir->i_mode & S_ISGID) {
 303                 gid = dir->i_gid;
 304                 if (S_ISDIR(mode))
 305                         mode |= S_ISGID;
 306         }
 307
 308         if (!it || !it->it_disposition) {
 309                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 310                                  tgtlen, mode, current->fsuid,
 311                                  gid, time, extra, lsm, &request);
 312                 if (rc) {
 313                         inode = ERR_PTR(rc);
 314                         GOTO(out, rc);
 315                 }
 316                 body = lustre_msg_buf(request->rq_repmsg, 0);
 317                 if (lsm != NULL) {
 318                         mds_md_size = ll_mds_easize(dir->i_sb);
 319                         OBD_ALLOC(lmm, mds_md_size);
 320                         lov_packmd(lmm, lsm);
 321                         lic.lic_lmm = lmm;
 322                 } else
 323                         lic.lic_lmm = NULL;
 324
 325         } else {
 326                 invalidate_inode_pages(dir);
 327                 request = it->it_data;
 328                 body = lustre_msg_buf(request->rq_repmsg, 1);
 329                 lic.lic_lmm = NULL;
 330         }
 331
 332         body->valid = OBD_MD_FLNOTOBD;
 333
 334         body->nlink = 1;
 335         body->atime = body->ctime = body->mtime = time;
 336         body->uid = current->fsuid;
 337         body->gid = gid;
 338         body->mode = mode;
 339
 340         lic.lic_body = body;
 341
 342         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 343         if (IS_ERR(inode)) {
 344                 rc = PTR_ERR(inode);
 345                 CERROR("new_inode -fatal: rc %d\n", rc);
 346                 LBUG();
 347                 GOTO(out, rc);
 348         }
 349
 350         if (!list_empty(&inode->i_dentry)) {
 351                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 352                        body->ino, atomic_read(&inode->i_count),
 353                        inode->i_nlink);
 354                 iput(inode);
 355                 LBUG();
 356                 inode = ERR_PTR(-EIO);
 357                 GOTO(out, -EIO);
 358         }
 359
 360         EXIT;
 361  out:
 362         if (lmm != NULL)
 363                 OBD_FREE(lmm, mds_md_size);
 364         ptlrpc_free_req(request);
 365         return inode;
 366 }
 367
 368 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 369                          const char *name, int len)
 370 {
 371         struct ptlrpc_request *request = NULL;
 372         struct ll_sb_info *sbi = ll_i2sbi(dir);
 373         int err;
 374
 375         ENTRY;
 376
 377         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 378                          &request);
 379         ptlrpc_free_req(request);
 380
 381         RETURN(err);
 382 }
 383
 384 int ll_mdc_link(struct dentry *src, struct inode *dir,
 385                 const char *name, int len)
 386 {
 387         struct ptlrpc_request *request = NULL;
 388         int err;
 389         struct ll_sb_info *sbi = ll_i2sbi(dir);
 390
 391         ENTRY;
 392
 393         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
 394                        len, &request);
 395         ptlrpc_free_req(request);
 396
 397         RETURN(err);
 398 }
 399
 400 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 401                   struct dentry *old, struct dentry *new)
 402 {
 403         struct ptlrpc_request *request = NULL;
 404         struct ll_sb_info *sbi = ll_i2sbi(src);
 405         int err;
 406
 407         ENTRY;
 408
 409         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 410                          old->d_name.name, old->d_name.len,
 411                          new->d_name.name, new->d_name.len, &request);
 412         ptlrpc_free_req(request);
 413
 414         RETURN(err);
 415 }
 416
 417 /*
 418  * By the time this is called, we already have created
 419  * the directory cache entry for the new file, but it
 420  * is so far negative - it has no inode.
 421  *
 422  * If the create succeeds, we fill in the inode information
 423  * with d_instantiate().
 424  */
 425
 426 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
 427 {
 428         int err, rc = 0;
 429         struct obdo oa;
 430         struct inode *inode;
 431         struct lov_stripe_md *lsm = NULL;
 432         struct ll_inode_info *lli = NULL;
 433         ENTRY;
 434
 435         if (dentry->d_it->it_disposition == 0) {
 436                 memset(&oa, 0, sizeof(oa));
 437                 oa.o_valid = OBD_MD_FLMODE;
 438                 oa.o_mode = S_IFREG | 0600;
 439                 rc = obd_create(ll_i2obdconn(dir), &oa, &lsm);
 440                 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld: rc = %d\n",
 441                        dentry->d_name.name, mode, (long long)oa.o_id, rc);
 442                 if (rc)
 443                         RETURN(rc);
 444         }
 445
 446         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 447                                NULL, 0, mode, 0, dentry->d_it, lsm);
 448
 449         if (IS_ERR(inode)) {
 450                 rc = PTR_ERR(inode);
 451                 CERROR("error creating MDS object for id %Ld: rc = %d\n",
 452                        (unsigned long long)oa.o_id, rc);
 453                 GOTO(out_destroy, rc);
 454         }
 455
 456         if (dentry->d_it->it_disposition) {
 457                 lli = ll_i2info(inode);
 458                 memcpy(&lli->lli_intent_lock_handle,
 459                        dentry->d_it->it_lock_handle,
 460                        sizeof(struct lustre_handle));
 461                 d_instantiate(dentry, inode);
 462         } else {
 463                 /* no directory data updates when intents rule */
 464                 rc = ext2_add_nondir(dentry, inode);
 465         }
 466
 467         RETURN(rc);
 468
 469 out_destroy:
 470         if (lsm) {
 471                 oa.o_easize = ll_mds_easize(inode->i_sb);
 472                 oa.o_valid |= OBD_MD_FLEASIZE;
 473                 err = obd_destroy(ll_i2obdconn(dir), &oa, lsm);
 474                 if (err)
 475                         CERROR("error destroying objid %Ld on error: err %d\n",
 476                        (unsigned long long)oa.o_id, err);
 477         }
 478
 479         return rc;
 480 }
 481
 482 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 483                     int rdev)
 484 {
 485         struct inode *inode;
 486         int err = 0;
 487
 488         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 489                                NULL, 0, mode, rdev, dentry->d_it, NULL);
 490
 491         if (IS_ERR(inode))
 492                 RETURN(PTR_ERR(inode));
 493
 494         /* no directory data updates when intents rule */
 495         if (dentry->d_it && dentry->d_it->it_disposition)
 496                 d_instantiate(dentry, inode);
 497         else
 498                 err = ext2_add_nondir(dentry, inode);
 499
 500         return err;
 501 }
 502
 503 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 504                       const char *symname)
 505 {
 506         unsigned l = strlen(symname);
 507         struct inode *inode;
 508         struct ll_inode_info *lli;
 509         int err = 0;
 510         ENTRY;
 511
 512         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 513                                symname, l, S_IFLNK | S_IRWXUGO, 0,
 514                                dentry->d_it, NULL);
 515         if (IS_ERR(inode))
 516                 RETURN(PTR_ERR(inode));
 517
 518         lli = ll_i2info(inode);
 519
 520         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 521         /* this _could_ be a non-fatal error, since the symlink is already
 522          * stored on the MDS by this point, and we can re-get it in readlink.
 523          */
 524         if (!lli->lli_symlink_name)
 525                 RETURN(-ENOMEM);
 526
 527         memcpy(lli->lli_symlink_name, symname, l + 1);
 528         inode->i_size = l;
 529
 530         /* no directory data updates when intents rule */
 531         if (dentry->d_it && dentry->d_it->it_disposition)
 532                 d_instantiate(dentry, inode);
 533         else
 534                 err = ext2_add_nondir(dentry, inode);
 535
 536         RETURN(err);
 537 }
 538
 539 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 540                    struct dentry *dentry)
 541 {
 542         int err;
 543         struct inode *inode = old_dentry->d_inode;
 544
 545 #warning FIXME: still needs intent support
 546         if (S_ISDIR(inode->i_mode))
 547                 return -EPERM;
 548
 549         if (inode->i_nlink >= EXT2_LINK_MAX)
 550                 return -EMLINK;
 551
 552         err = ll_mdc_link(old_dentry, dir,
 553                           dentry->d_name.name, dentry->d_name.len);
 554         if (err)
 555                 RETURN(err);
 556
 557         inode->i_ctime = CURRENT_TIME;
 558         ext2_inc_count(inode);
 559         atomic_inc(&inode->i_count);
 560
 561         return ext2_add_nondir(dentry, inode);
 562 }
 563
 564 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 565 {
 566         struct inode * inode;
 567         int err = -EMLINK;
 568         ENTRY;
 569
 570         if (dir->i_nlink >= EXT2_LINK_MAX)
 571                 goto out;
 572
 573         ext2_inc_count(dir);
 574
 575         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 576                                NULL, 0, S_IFDIR | mode, 0, dentry->d_it, NULL);
 577         err = PTR_ERR(inode);
 578         if (IS_ERR(inode))
 579                 goto out_dir;
 580
 581         ext2_inc_count(inode);
 582
 583         err = ext2_make_empty(inode, dir);
 584         if (err)
 585                 goto out_fail;
 586
 587         /* no directory data updates when intents rule */
 588         if (dentry->d_it->it_disposition == 0) {
 589                 err = ll_add_link(dentry, inode);
 590                 if (err)
 591                         goto out_fail;
 592         }
 593
 594         d_instantiate(dentry, inode);
 595 out:
 596         EXIT;
 597         return err;
 598
 599 out_fail:
 600         ext2_dec_count(inode);
 601         ext2_dec_count(inode);
 602         iput(inode);
 603         EXIT;
 604 out_dir:
 605         ext2_dec_count(dir);
 606         EXIT;
 607         goto out;
 608 }
 609
 610 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 611                             __u32 mode)
 612 {
 613         struct inode * inode = dentry->d_inode;
 614         struct ext2_dir_entry_2 * de;
 615         struct page * page;
 616         int err = -ENOENT;
 617
 618         if (dentry->d_it && dentry->d_it->it_disposition) {
 619                 err = dentry->d_it->it_status;
 620                 invalidate_inode_pages(dir);
 621                 GOTO(out, err);
 622         }
 623
 624         de = ext2_find_entry(dir, dentry, &page);
 625         if (!de)
 626                 goto out;
 627
 628         err = ll_mdc_unlink(dir, dentry->d_inode, mode,
 629                             dentry->d_name.name, dentry->d_name.len);
 630         if (err)
 631                 goto out;
 632
 633         err = ext2_delete_entry(de, page);
 634         if (err)
 635                 goto out;
 636
 637         inode->i_ctime = dir->i_ctime;
 638 out:
 639         ext2_dec_count(inode);
 640         return err;
 641 }
 642
 643 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 644 {
 645         return ll_common_unlink(dir, dentry, S_IFREG);
 646 }
 647
 648 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 649 {
 650         struct inode * inode = dentry->d_inode;
 651         int err = 0;
 652         ENTRY;
 653
 654         if (!dentry->d_it || dentry->d_it->it_disposition == 0) {
 655                 if (!ext2_empty_dir(inode))
 656                         LBUG();
 657                 err = ll_common_unlink(dir, dentry, S_IFDIR);
 658         } else
 659                 err = dentry->d_it->it_status;
 660         if (err)
 661                 RETURN(err);
 662         inode->i_size = 0;
 663         ext2_dec_count(inode);
 664         ext2_dec_count(dir);
 665         RETURN(err);
 666 }
 667
 668 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 669                      struct inode * new_dir, struct dentry * new_dentry)
 670 {
 671         struct inode * old_inode = old_dentry->d_inode;
 672         struct inode * new_inode = new_dentry->d_inode;
 673         struct page * dir_page = NULL;
 674         struct ext2_dir_entry_2 * dir_de = NULL;
 675         struct ext2_dir_entry_2 * old_de;
 676         struct page * old_page;
 677         int err = -ENOENT;
 678
 679         if (new_dentry->d_it && new_dentry->d_it->it_disposition) {
 680                 if (new_inode) {
 681                         new_inode->i_ctime = CURRENT_TIME;
 682                         new_inode->i_nlink--;
 683                 }
 684                 invalidate_inode_pages(old_dir);
 685                 invalidate_inode_pages(new_dir);
 686                 GOTO(out, err = new_dentry->d_it->it_status);
 687         }
 688
 689         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 690         if (err)
 691                 goto out;
 692
 693         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 694         if (!old_de)
 695                 goto out;
 696
 697         if (S_ISDIR(old_inode->i_mode)) {
 698                 err = -EIO;
 699                 dir_de = ext2_dotdot(old_inode, &dir_page);
 700                 if (!dir_de)
 701                         goto out_old;
 702         }
 703
 704         if (new_inode) {
 705                 struct page *new_page;
 706                 struct ext2_dir_entry_2 *new_de;
 707
 708                 err = -ENOTEMPTY;
 709                 if (dir_de && !ext2_empty_dir (new_inode))
 710                         goto out_dir;
 711
 712                 err = -ENOENT;
 713                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 714                 if (!new_de)
 715                         goto out_dir;
 716                 ext2_inc_count(old_inode);
 717                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 718                 new_inode->i_ctime = CURRENT_TIME;
 719                 if (dir_de)
 720                         new_inode->i_nlink--;
 721                 ext2_dec_count(new_inode);
 722         } else {
 723                 if (dir_de) {
 724                         err = -EMLINK;
 725                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 726                                 goto out_dir;
 727                 }
 728                 ext2_inc_count(old_inode);
 729                 err = ll_add_link(new_dentry, old_inode);
 730                 if (err) {
 731                         ext2_dec_count(old_inode);
 732                         goto out_dir;
 733                 }
 734                 if (dir_de)
 735                         ext2_inc_count(new_dir);
 736         }
 737
 738         ext2_delete_entry (old_de, old_page);
 739         ext2_dec_count(old_inode);
 740
 741         if (dir_de) {
 742                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 743                 ext2_dec_count(old_dir);
 744         }
 745         return 0;
 746
 747 out_dir:
 748         if (dir_de) {
 749                 kunmap(dir_page);
 750                 page_cache_release(dir_page);
 751         }
 752 out_old:
 753         kunmap(old_page);
 754         page_cache_release(old_page);
 755 out:
 756         return err;
 757 }
 758
 759 struct inode_operations ll_dir_inode_operations = {
 760         create:         ll_create,
 761         lookup2:        ll_lookup2,
 762         link:           ll_link,
 763         unlink:         ll_unlink,
 764         symlink:        ll_symlink,
 765         mkdir:          ll_mkdir,
 766         rmdir:          ll_rmdir,
 767         mknod:          ll_mknod,
 768         rename:         ll_rename,
 769         setattr:        ll_setattr
 770 };