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         struct mds_body *body = lic->lic_body;
  91
  92         if (inode->i_generation != lic->lic_body->generation)
  93                 return 0;
  94
  95         /* Apply the attributes in 'opaque' to this inode */
  96         ll_update_inode(inode, body);
  97
  98         return 1;
  99 }
 100
 101 extern struct dentry_operations ll_d_ops;
 102
 103 int ll_lock(struct inode *dir, struct dentry *dentry,
 104             struct lookup_intent *it, struct lustre_handle *lockh)
 105 {
 106         struct ll_sb_info *sbi = ll_i2sbi(dir);
 107         char *tgt = NULL;
 108         int tgtlen = 0;
 109         int err, lock_mode;
 110
 111         if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SETATTR | IT_MKNOD)))
 112                 lock_mode = LCK_PW;
 113         else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
 114                               IT_RMDIR | IT_RENAME | IT_RENAME2 | IT_READLINK|
 115                               IT_LINK | IT_LINK2))
 116                 lock_mode = LCK_PR;
 117         else if (it->it_op & IT_SYMLINK) {
 118                 lock_mode = LCK_PW;
 119                 tgt = it->it_data;
 120                 tgtlen = strlen(tgt);
 121                 it->it_data = NULL;
 122         } else if (it->it_op & IT_LOOKUP)
 123                 lock_mode = LCK_PR;
 124         else {
 125                 LBUG();
 126                 RETURN(-EINVAL);
 127         }
 128
 129         err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT, it, lock_mode,
 130                           dir, dentry, lockh, tgt, tgtlen, dir, sizeof(*dir));
 131
 132         RETURN(err);
 133 }
 134
 135 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
 136 {
 137         ENTRY;
 138
 139         ldlm_lock_decref(lockh, mode);
 140
 141         RETURN(0);
 142 }
 143
 144 static struct dentry *ll_lookup2(struct inode *dir, struct dentry *dentry,
 145                                  struct lookup_intent *it)
 146 {
 147         struct ptlrpc_request *request = NULL;
 148         struct inode * inode = NULL;
 149         struct ll_sb_info *sbi = ll_i2sbi(dir);
 150         struct ll_read_inode2_cookie lic;
 151         struct lustre_handle lockh;
 152         struct lookup_intent lookup_it = { IT_LOOKUP };
 153         int err, offset;
 154         obd_id ino = 0;
 155
 156         ENTRY;
 157
 158         CHECK_MOUNT_EPOCH(dir);
 159
 160         if (it == NULL) {
 161                 it = &lookup_it;
 162                 dentry->d_it = it;
 163         }
 164
 165         CDEBUG(D_INFO, "name: %*s, intent op: %d\n", dentry->d_name.len,
 166                dentry->d_name.name, it->it_op);
 167
 168         if (dentry->d_name.len > EXT2_NAME_LEN)
 169                 RETURN(ERR_PTR(-ENAMETOOLONG));
 170
 171         err = ll_lock(dir, dentry, it, &lockh);
 172         if (err < 0)
 173                 RETURN(ERR_PTR(err));
 174         memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
 175
 176         request = (struct ptlrpc_request *)it->it_data;
 177         if (it->it_disposition) {
 178                 int mode, symlen = 0;
 179                 obd_flag valid;
 180
 181                 offset = 1;
 182                 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 183                 ino = lic.lic_body->fid1.id;
 184                 mode = lic.lic_body->mode;
 185                 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
 186                         /* For create ops, we want the lookup to be negative */
 187                         if (!it->it_status)
 188                                 GOTO(negative, NULL);
 189                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP)) {
 190                         /* For check ops, we want the lookup to succeed */
 191                         it->it_data = NULL;
 192                         if (it->it_status)
 193                                 GOTO(neg_req, NULL);
 194                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 195                         /* For rename, we want the lookup to succeed */
 196                         if (it->it_status) {
 197                                 it->it_data = NULL;
 198                                 GOTO(neg_req, NULL);
 199                         }
 200                         it->it_data = dentry;
 201                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 202                         /* For remove ops, we want the lookup to succeed */
 203                         it->it_data = NULL;
 204                         if (it->it_status)
 205                                 GOTO(neg_req, NULL);
 206                         goto iget;
 207                 } else if (it->it_op == IT_OPEN) {
 208                         it->it_data = NULL;
 209                         if (it->it_status && it->it_status != -EEXIST)
 210                                 GOTO(neg_req, NULL);
 211                 } else if (it->it_op & (IT_RENAME2|IT_LINK2)) {
 212                         struct mds_body *body =
 213                                 lustre_msg_buf(request->rq_repmsg, offset);
 214                         it->it_data = NULL;
 215                         /* For rename2, this means the lookup is negative */
 216                         /* For link2 also */
 217                         if (body->valid == 0)
 218                                 GOTO(neg_req, NULL);
 219                         goto iget;
 220                 }
 221
 222                 /* Do a getattr now that we have the lock */
 223                 valid = OBD_MD_FLNOTOBD | OBD_MD_FLEASIZE;
 224                 if (it->it_op == IT_READLINK) {
 225                         valid |= OBD_MD_LINKNAME;
 226                         symlen = lic.lic_body->size;
 227                 }
 228                 ptlrpc_free_req(request);
 229                 request = NULL;
 230                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 231                                   valid, symlen, &request);
 232                 if (err) {
 233                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 234                         GOTO(drop_req, err = -abs(err));
 235                 }
 236                 offset = 0;
 237         } else {
 238                 struct ll_inode_info *lli = ll_i2info(dir);
 239                 int mode;
 240
 241                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 242                 offset = 0;
 243
 244                 ino = ll_inode_by_name(dir, dentry, &mode);
 245                 if (!ino) {
 246                         CERROR("inode %*s not found by name\n",
 247                                dentry->d_name.len, dentry->d_name.name);
 248                         GOTO(drop_lock, err = -ENOENT);
 249                 }
 250
 251                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 252                                   OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 253                 if (err) {
 254                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 255                         GOTO(drop_req, err = -abs(err));
 256                 }
 257         }
 258
 259  iget:
 260         lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 261         if (S_ISREG(lic.lic_body->mode) &&
 262             lic.lic_body->valid & OBD_MD_FLEASIZE) {
 263                 LASSERT(request->rq_repmsg->bufcount > offset);
 264                 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
 265         } else
 266                 lic.lic_lmm = NULL;
 267
 268         /* No rpc's happen during iget4, -ENOMEM's are possible */
 269         LASSERT(ino != 0);
 270         inode = iget4(dir->i_sb, ino, ll_find_inode, &lic);
 271
 272         if (!inode) {
 273                 ptlrpc_free_req(request);
 274                 ll_intent_release(dentry);
 275                 RETURN(ERR_PTR(-ENOMEM));
 276         }
 277
 278         EXIT;
 279  neg_req:
 280         ptlrpc_req_finished(request);
 281  negative:
 282         dentry->d_op = &ll_d_ops;
 283         d_add(dentry, inode);
 284         if (it->it_op == IT_LOOKUP)
 285                 ll_intent_release(dentry);
 286
 287         return NULL;
 288
 289  drop_req:
 290         ptlrpc_free_req(request);
 291  drop_lock:
 292 #warning FIXME: must release lock here
 293         return ERR_PTR(err);
 294 }
 295
 296 static struct inode *ll_create_node(struct inode *dir, const char *name,
 297                                     int namelen, const char *tgt, int tgtlen,
 298                                     int mode, __u64 extra,
 299                                     struct lookup_intent *it,
 300                                     struct lov_stripe_md *lsm)
 301 {
 302         struct inode *inode;
 303         struct ptlrpc_request *request = NULL;
 304         struct mds_body *body;
 305         int rc;
 306         time_t time = CURRENT_TIME;
 307         struct ll_sb_info *sbi = ll_i2sbi(dir);
 308         int gid = current->fsgid;
 309         struct ll_read_inode2_cookie lic;
 310         struct lov_mds_md *lmm = NULL;
 311         int mds_md_size = 0;
 312
 313         ENTRY;
 314
 315         if (dir->i_mode & S_ISGID) {
 316                 gid = dir->i_gid;
 317                 if (S_ISDIR(mode))
 318                         mode |= S_ISGID;
 319         }
 320
 321         if (!it || !it->it_disposition) {
 322                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 323                                  tgtlen, mode, current->fsuid,
 324                                  gid, time, extra, lsm, &request);
 325                 if (rc) {
 326                         inode = ERR_PTR(rc);
 327                         GOTO(out, rc);
 328                 }
 329                 body = lustre_msg_buf(request->rq_repmsg, 0);
 330                 if (lsm != NULL) {
 331                         mds_md_size = ll_mds_easize(dir->i_sb);
 332                         OBD_ALLOC(lmm, mds_md_size);
 333                         lov_packmd(lmm, lsm);
 334                         lic.lic_lmm = lmm;
 335                 } else
 336                         lic.lic_lmm = NULL;
 337
 338         } else {
 339                 invalidate_inode_pages(dir);
 340                 request = it->it_data;
 341                 body = lustre_msg_buf(request->rq_repmsg, 1);
 342                 lic.lic_lmm = NULL;
 343         }
 344
 345         body->valid = OBD_MD_FLNOTOBD;
 346
 347         body->nlink = 1;
 348         body->atime = body->ctime = body->mtime = time;
 349         body->uid = current->fsuid;
 350         body->gid = gid;
 351         body->mode = mode;
 352
 353         lic.lic_body = body;
 354
 355         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 356         if (IS_ERR(inode)) {
 357                 rc = PTR_ERR(inode);
 358                 CERROR("new_inode -fatal: rc %d\n", rc);
 359                 LBUG();
 360                 GOTO(out, rc);
 361         }
 362
 363         if (!list_empty(&inode->i_dentry)) {
 364                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 365                        body->ino, atomic_read(&inode->i_count),
 366                        inode->i_nlink);
 367                 iput(inode);
 368                 LBUG();
 369                 inode = ERR_PTR(-EIO);
 370                 GOTO(out, -EIO);
 371         }
 372
 373         EXIT;
 374  out:
 375         if (lmm)
 376                 OBD_FREE(lmm, mds_md_size);
 377         ptlrpc_free_req(request);
 378         return inode;
 379 }
 380
 381 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 382                          const char *name, int len)
 383 {
 384         struct ptlrpc_request *request = NULL;
 385         struct ll_sb_info *sbi = ll_i2sbi(dir);
 386         int err;
 387
 388         ENTRY;
 389
 390         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 391                          &request);
 392         ptlrpc_free_req(request);
 393
 394         RETURN(err);
 395 }
 396
 397 int ll_mdc_link(struct dentry *src, struct inode *dir,
 398                 const char *name, int len)
 399 {
 400         struct ptlrpc_request *request = NULL;
 401         int err;
 402         struct ll_sb_info *sbi = ll_i2sbi(dir);
 403
 404         ENTRY;
 405
 406         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
 407                        len, &request);
 408         ptlrpc_free_req(request);
 409
 410         RETURN(err);
 411 }
 412
 413 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 414                   struct dentry *old, struct dentry *new)
 415 {
 416         struct ptlrpc_request *request = NULL;
 417         struct ll_sb_info *sbi = ll_i2sbi(src);
 418         int err;
 419
 420         ENTRY;
 421
 422         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 423                          old->d_name.name, old->d_name.len,
 424                          new->d_name.name, new->d_name.len, &request);
 425         ptlrpc_free_req(request);
 426
 427         RETURN(err);
 428 }
 429
 430 /*
 431  * By the time this is called, we already have created
 432  * the directory cache entry for the new file, but it
 433  * is so far negative - it has no inode.
 434  *
 435  * If the create succeeds, we fill in the inode information
 436  * with d_instantiate().
 437  */
 438
 439 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
 440 {
 441         int err, rc = 0;
 442         struct obdo oa;
 443         struct inode *inode;
 444         struct lov_stripe_md *lsm = NULL;
 445         struct ll_inode_info *lli = NULL;
 446         ENTRY;
 447
 448         CHECK_MOUNT_EPOCH(dir);
 449
 450         if (dentry->d_it->it_disposition == 0) {
 451                 memset(&oa, 0, sizeof(oa));
 452                 oa.o_mode = S_IFREG | 0600;
 453                 oa.o_valid = OBD_MD_FLTYPE | OBD_MD_FLMODE;
 454                 rc = obd_create(ll_i2obdconn(dir), &oa, &lsm);
 455                 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld: rc = %d\n",
 456                        dentry->d_name.name, mode, (long long)oa.o_id, rc);
 457                 if (rc)
 458                         RETURN(rc);
 459         }
 460
 461         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 462                                NULL, 0, mode, 0, dentry->d_it, lsm);
 463
 464         if (IS_ERR(inode)) {
 465                 rc = PTR_ERR(inode);
 466                 CERROR("error creating MDS object for id %Ld: rc = %d\n",
 467                        (unsigned long long)oa.o_id, rc);
 468                 GOTO(out_destroy, rc);
 469         }
 470
 471         if (dentry->d_it->it_disposition) {
 472                 lli = ll_i2info(inode);
 473                 memcpy(&lli->lli_intent_lock_handle,
 474                        dentry->d_it->it_lock_handle,
 475                        sizeof(struct lustre_handle));
 476                 d_instantiate(dentry, inode);
 477         } else {
 478                 /* no directory data updates when intents rule */
 479                 rc = ext2_add_nondir(dentry, inode);
 480         }
 481
 482         RETURN(rc);
 483
 484 out_destroy:
 485         if (lsm) {
 486                 oa.o_easize = ll_mds_easize(inode->i_sb);
 487                 oa.o_valid |= OBD_MD_FLEASIZE;
 488                 err = obd_destroy(ll_i2obdconn(dir), &oa, lsm);
 489                 if (err)
 490                         CERROR("error destroying objid %Ld on error: err %d\n",
 491                        (unsigned long long)oa.o_id, err);
 492         }
 493
 494         return rc;
 495 }
 496
 497 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 498                     int rdev)
 499 {
 500         struct inode *inode;
 501         int err = 0;
 502
 503         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 504                                NULL, 0, mode, rdev, dentry->d_it, NULL);
 505
 506         if (IS_ERR(inode))
 507                 RETURN(PTR_ERR(inode));
 508
 509         /* no directory data updates when intents rule */
 510         if (dentry->d_it && dentry->d_it->it_disposition)
 511                 d_instantiate(dentry, inode);
 512         else
 513                 err = ext2_add_nondir(dentry, inode);
 514
 515         return err;
 516 }
 517
 518 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 519                       const char *symname)
 520 {
 521         unsigned l = strlen(symname);
 522         struct inode *inode;
 523         struct ll_inode_info *lli;
 524         int err = 0;
 525         ENTRY;
 526
 527         CHECK_MOUNT_EPOCH(dir);
 528
 529         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 530                                symname, l, S_IFLNK | S_IRWXUGO, 0,
 531                                dentry->d_it, NULL);
 532         if (IS_ERR(inode))
 533                 RETURN(PTR_ERR(inode));
 534
 535         lli = ll_i2info(inode);
 536
 537         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 538         /* this _could_ be a non-fatal error, since the symlink is already
 539          * stored on the MDS by this point, and we can re-get it in readlink.
 540          */
 541         if (!lli->lli_symlink_name)
 542                 RETURN(-ENOMEM);
 543
 544         memcpy(lli->lli_symlink_name, symname, l + 1);
 545         inode->i_size = l;
 546
 547         /* no directory data updates when intents rule */
 548         if (dentry->d_it && dentry->d_it->it_disposition)
 549                 d_instantiate(dentry, inode);
 550         else
 551                 err = ext2_add_nondir(dentry, inode);
 552
 553         RETURN(err);
 554 }
 555
 556 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 557                    struct dentry *dentry)
 558 {
 559         int err;
 560         struct inode *inode = old_dentry->d_inode;
 561
 562         if (dentry->d_it && dentry->d_it->it_disposition) {
 563                 int err = dentry->d_it->it_status;
 564                 if (err)
 565                         RETURN(err);
 566                 inode->i_ctime = CURRENT_TIME;
 567                 ext2_inc_count(inode);
 568                 atomic_inc(&inode->i_count);
 569                 d_instantiate(dentry, inode);
 570                 invalidate_inode_pages(dir);
 571                 RETURN(err);
 572         }
 573
 574         if (S_ISDIR(inode->i_mode))
 575                 return -EPERM;
 576
 577         if (inode->i_nlink >= EXT2_LINK_MAX)
 578                 return -EMLINK;
 579
 580         err = ll_mdc_link(old_dentry, dir,
 581                           dentry->d_name.name, dentry->d_name.len);
 582         if (err)
 583                 RETURN(err);
 584
 585         inode->i_ctime = CURRENT_TIME;
 586         ext2_inc_count(inode);
 587         atomic_inc(&inode->i_count);
 588
 589         return ext2_add_nondir(dentry, inode);
 590 }
 591
 592 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 593 {
 594         struct inode * inode;
 595         int err = -EMLINK;
 596         ENTRY;
 597
 598         if (dir->i_nlink >= EXT2_LINK_MAX)
 599                 goto out;
 600
 601         ext2_inc_count(dir);
 602
 603         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 604                                NULL, 0, S_IFDIR | mode, 0, dentry->d_it, NULL);
 605         err = PTR_ERR(inode);
 606         if (IS_ERR(inode))
 607                 goto out_dir;
 608
 609         ext2_inc_count(inode);
 610
 611         err = ext2_make_empty(inode, dir);
 612         if (err)
 613                 goto out_fail;
 614
 615         /* no directory data updates when intents rule */
 616         if (dentry->d_it->it_disposition == 0) {
 617                 err = ll_add_link(dentry, inode);
 618                 if (err)
 619                         goto out_fail;
 620         }
 621
 622         d_instantiate(dentry, inode);
 623 out:
 624         EXIT;
 625         return err;
 626
 627 out_fail:
 628         ext2_dec_count(inode);
 629         ext2_dec_count(inode);
 630         iput(inode);
 631         EXIT;
 632 out_dir:
 633         ext2_dec_count(dir);
 634         EXIT;
 635         goto out;
 636 }
 637
 638 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 639                             __u32 mode)
 640 {
 641         struct inode * inode = dentry->d_inode;
 642 #if 0
 643         struct ext2_dir_entry_2 * de;
 644         struct page * page;
 645 #endif
 646         int err = -ENOENT;
 647
 648         if (dentry->d_it && dentry->d_it->it_disposition) {
 649                 err = dentry->d_it->it_status;
 650                 invalidate_inode_pages(dir);
 651                 GOTO(out, err);
 652         }
 653
 654 #if 0
 655         de = ext2_find_entry(dir, dentry, &page);
 656         if (!de)
 657                 goto out;
 658 #endif
 659         err = ll_mdc_unlink(dir, dentry->d_inode, mode,
 660                             dentry->d_name.name, dentry->d_name.len);
 661         if (err)
 662                 goto out;
 663
 664 #if 0
 665         err = ext2_delete_entry(de, page);
 666         if (err)
 667                 goto out;
 668 #endif
 669         invalidate_inode_pages(dir);
 670
 671         inode->i_ctime = dir->i_ctime;
 672 out:
 673         ext2_dec_count(inode);
 674         return err;
 675 }
 676
 677 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 678 {
 679         return ll_common_unlink(dir, dentry, S_IFREG);
 680 }
 681
 682 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 683 {
 684         struct inode * inode = dentry->d_inode;
 685         int err = 0;
 686         ENTRY;
 687
 688         if (!dentry->d_it || dentry->d_it->it_disposition == 0) {
 689                 if (!ext2_empty_dir(inode))
 690                         LBUG();
 691                 err = ll_common_unlink(dir, dentry, S_IFDIR);
 692         } else
 693                 err = dentry->d_it->it_status;
 694         if (err)
 695                 RETURN(err);
 696         inode->i_size = 0;
 697         ext2_dec_count(inode);
 698         ext2_dec_count(dir);
 699         RETURN(err);
 700 }
 701
 702 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 703                      struct inode * new_dir, struct dentry * new_dentry)
 704 {
 705         struct inode * old_inode = old_dentry->d_inode;
 706         struct inode * tgt_inode = new_dentry->d_inode;
 707         struct page * dir_page = NULL;
 708         struct ext2_dir_entry_2 * dir_de = NULL;
 709         struct ext2_dir_entry_2 * old_de;
 710         struct page * old_page;
 711         int err = -ENOENT;
 712
 713         if (new_dentry->d_it && new_dentry->d_it->it_disposition) {
 714                 if (tgt_inode) {
 715                         tgt_inode->i_ctime = CURRENT_TIME;
 716                         tgt_inode->i_nlink--;
 717                 }
 718                 invalidate_inode_pages(old_dir);
 719                 invalidate_inode_pages(new_dir);
 720                 GOTO(out, err = new_dentry->d_it->it_status);
 721         }
 722
 723         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 724         if (err)
 725                 goto out;
 726
 727         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 728         if (!old_de)
 729                 goto out;
 730
 731         if (S_ISDIR(old_inode->i_mode)) {
 732                 err = -EIO;
 733                 dir_de = ext2_dotdot(old_inode, &dir_page);
 734                 if (!dir_de)
 735                         goto out_old;
 736         }
 737
 738         if (tgt_inode) {
 739                 struct page *new_page;
 740                 struct ext2_dir_entry_2 *new_de;
 741
 742                 err = -ENOTEMPTY;
 743                 if (dir_de && !ext2_empty_dir (tgt_inode))
 744                         goto out_dir;
 745
 746                 err = -ENOENT;
 747                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 748                 if (!new_de)
 749                         goto out_dir;
 750                 ext2_inc_count(old_inode);
 751                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 752                 tgt_inode->i_ctime = CURRENT_TIME;
 753                 if (dir_de)
 754                         tgt_inode->i_nlink--;
 755                 ext2_dec_count(tgt_inode);
 756         } else {
 757                 if (dir_de) {
 758                         err = -EMLINK;
 759                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 760                                 goto out_dir;
 761                 }
 762                 ext2_inc_count(old_inode);
 763                 err = ll_add_link(new_dentry, old_inode);
 764                 if (err) {
 765                         ext2_dec_count(old_inode);
 766                         goto out_dir;
 767                 }
 768                 if (dir_de)
 769                         ext2_inc_count(new_dir);
 770         }
 771
 772         ext2_delete_entry (old_de, old_page);
 773         ext2_dec_count(old_inode);
 774
 775         if (dir_de) {
 776                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 777                 ext2_dec_count(old_dir);
 778         }
 779         return 0;
 780
 781 out_dir:
 782         if (dir_de) {
 783                 kunmap(dir_page);
 784                 page_cache_release(dir_page);
 785         }
 786 out_old:
 787         kunmap(old_page);
 788         page_cache_release(old_page);
 789 out:
 790         return err;
 791 }
 792
 793 struct inode_operations ll_dir_inode_operations = {
 794         create:         ll_create,
 795         lookup2:        ll_lookup2,
 796         link:           ll_link,
 797         unlink:         ll_unlink,
 798         symlink:        ll_symlink,
 799         mkdir:          ll_mkdir,
 800         rmdir:          ll_rmdir,
 801         mknod:          ll_mknod,
 802         rename:         ll_rename,
 803         setattr:        ll_setattr
 804 };