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         if (ll_i2info(dir)->lli_mount_epoch != ll_i2sbi(dir)->ll_mount_epoch)
 160                 RETURN(ERR_PTR(-EIO));
 161
 162         if (it == NULL) {
 163                 it = &lookup_it;
 164                 dentry->d_it = it;
 165         }
 166
 167         CDEBUG(D_INFO, "name: %*s, intent op: %d\n", dentry->d_name.len,
 168                dentry->d_name.name, it->it_op);
 169
 170         if (dentry->d_name.len > EXT2_NAME_LEN)
 171                 RETURN(ERR_PTR(-ENAMETOOLONG));
 172
 173         err = ll_lock(dir, dentry, it, &lockh);
 174         if (err < 0)
 175                 RETURN(ERR_PTR(err));
 176         memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
 177
 178         request = (struct ptlrpc_request *)it->it_data;
 179         if (it->it_disposition) {
 180                 int mode, symlen = 0;
 181                 obd_flag valid;
 182
 183                 offset = 1;
 184                 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 185                 ino = lic.lic_body->fid1.id;
 186                 mode = lic.lic_body->mode;
 187                 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
 188                         /* For create ops, we want the lookup to be negative */
 189                         if (!it->it_status)
 190                                 GOTO(negative, NULL);
 191                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP)) {
 192                         /* For check ops, we want the lookup to succeed */
 193                         it->it_data = NULL;
 194                         if (it->it_status)
 195                                 GOTO(neg_req, NULL);
 196                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 197                         /* For rename, we want the lookup to succeed */
 198                         if (it->it_status) {
 199                                 it->it_data = NULL;
 200                                 GOTO(neg_req, NULL);
 201                         }
 202                         it->it_data = dentry;
 203                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 204                         /* For remove ops, we want the lookup to succeed */
 205                         it->it_data = NULL;
 206                         if (it->it_status)
 207                                 GOTO(neg_req, NULL);
 208                         goto iget;
 209                 } else if (it->it_op == IT_OPEN) {
 210                         it->it_data = NULL;
 211                         if (it->it_status && it->it_status != -EEXIST)
 212                                 GOTO(neg_req, NULL);
 213                 } else if (it->it_op & (IT_RENAME2|IT_LINK2)) {
 214                         struct mds_body *body =
 215                                 lustre_msg_buf(request->rq_repmsg, offset);
 216                         it->it_data = NULL;
 217                         /* For rename2, this means the lookup is negative */
 218                         /* For link2 also */
 219                         if (body->valid == 0)
 220                                 GOTO(neg_req, NULL);
 221                         goto iget;
 222                 }
 223
 224                 /* Do a getattr now that we have the lock */
 225                 valid = OBD_MD_FLNOTOBD | OBD_MD_FLEASIZE;
 226                 if (it->it_op == IT_READLINK) {
 227                         valid |= OBD_MD_LINKNAME;
 228                         symlen = lic.lic_body->size;
 229                 }
 230                 ptlrpc_free_req(request);
 231                 request = NULL;
 232                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 233                                   valid, symlen, &request);
 234                 if (err) {
 235                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 236                         GOTO(drop_req, err = -abs(err));
 237                 }
 238                 offset = 0;
 239         } else {
 240                 struct ll_inode_info *lli = ll_i2info(dir);
 241                 int mode;
 242
 243                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 244                 offset = 0;
 245
 246                 ino = ll_inode_by_name(dir, dentry, &mode);
 247                 if (!ino) {
 248                         CERROR("inode %*s not found by name\n",
 249                                dentry->d_name.len, dentry->d_name.name);
 250                         GOTO(drop_lock, err = -ENOENT);
 251                 }
 252
 253                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 254                                   OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 255                 if (err) {
 256                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 257                         GOTO(drop_req, err = -abs(err));
 258                 }
 259         }
 260
 261  iget:
 262         lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 263         if (S_ISREG(lic.lic_body->mode) &&
 264             lic.lic_body->valid & OBD_MD_FLEASIZE) {
 265                 LASSERT(request->rq_repmsg->bufcount > offset);
 266                 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
 267         } else
 268                 lic.lic_lmm = NULL;
 269
 270         /* No rpc's happen during iget4, -ENOMEM's are possible */
 271         LASSERT(ino != 0);
 272         inode = iget4(dir->i_sb, ino, ll_find_inode, &lic);
 273
 274         if (!inode) {
 275                 ptlrpc_free_req(request);
 276                 ll_intent_release(dentry);
 277                 RETURN(ERR_PTR(-ENOMEM));
 278         }
 279
 280         EXIT;
 281  neg_req:
 282         ptlrpc_req_finished(request);
 283  negative:
 284         dentry->d_op = &ll_d_ops;
 285         d_add(dentry, inode);
 286         if (it->it_op == IT_LOOKUP)
 287                 ll_intent_release(dentry);
 288
 289         return NULL;
 290
 291  drop_req:
 292         ptlrpc_free_req(request);
 293  drop_lock:
 294 #warning FIXME: must release lock here
 295         return ERR_PTR(err);
 296 }
 297
 298 static struct inode *ll_create_node(struct inode *dir, const char *name,
 299                                     int namelen, const char *tgt, int tgtlen,
 300                                     int mode, __u64 extra,
 301                                     struct lookup_intent *it,
 302                                     struct lov_stripe_md *lsm)
 303 {
 304         struct inode *inode;
 305         struct ptlrpc_request *request = NULL;
 306         struct mds_body *body;
 307         int rc;
 308         time_t time = CURRENT_TIME;
 309         struct ll_sb_info *sbi = ll_i2sbi(dir);
 310         int gid = current->fsgid;
 311         struct ll_read_inode2_cookie lic;
 312         struct lov_mds_md *lmm = NULL;
 313         int mds_md_size = 0;
 314
 315         ENTRY;
 316
 317         if (dir->i_mode & S_ISGID) {
 318                 gid = dir->i_gid;
 319                 if (S_ISDIR(mode))
 320                         mode |= S_ISGID;
 321         }
 322
 323         if (!it || !it->it_disposition) {
 324                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 325                                  tgtlen, mode, current->fsuid,
 326                                  gid, time, extra, lsm, &request);
 327                 if (rc) {
 328                         inode = ERR_PTR(rc);
 329                         GOTO(out, rc);
 330                 }
 331                 body = lustre_msg_buf(request->rq_repmsg, 0);
 332                 if (lsm != NULL) {
 333                         mds_md_size = ll_mds_easize(dir->i_sb);
 334                         OBD_ALLOC(lmm, mds_md_size);
 335                         lov_packmd(lmm, lsm);
 336                         lic.lic_lmm = lmm;
 337                 } else
 338                         lic.lic_lmm = NULL;
 339
 340         } else {
 341                 invalidate_inode_pages(dir);
 342                 request = it->it_data;
 343                 body = lustre_msg_buf(request->rq_repmsg, 1);
 344                 lic.lic_lmm = NULL;
 345         }
 346
 347         body->valid = OBD_MD_FLNOTOBD;
 348
 349         body->nlink = 1;
 350         body->atime = body->ctime = body->mtime = time;
 351         body->uid = current->fsuid;
 352         body->gid = gid;
 353         body->mode = mode;
 354
 355         lic.lic_body = body;
 356
 357         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 358         if (IS_ERR(inode)) {
 359                 rc = PTR_ERR(inode);
 360                 CERROR("new_inode -fatal: rc %d\n", rc);
 361                 LBUG();
 362                 GOTO(out, rc);
 363         }
 364
 365         if (!list_empty(&inode->i_dentry)) {
 366                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 367                        body->ino, atomic_read(&inode->i_count),
 368                        inode->i_nlink);
 369                 iput(inode);
 370                 LBUG();
 371                 inode = ERR_PTR(-EIO);
 372                 GOTO(out, -EIO);
 373         }
 374
 375         EXIT;
 376  out:
 377         if (lmm)
 378                 OBD_FREE(lmm, mds_md_size);
 379         ptlrpc_free_req(request);
 380         return inode;
 381 }
 382
 383 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 384                          const char *name, int len)
 385 {
 386         struct ptlrpc_request *request = NULL;
 387         struct ll_sb_info *sbi = ll_i2sbi(dir);
 388         int err;
 389
 390         ENTRY;
 391
 392         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 393                          &request);
 394         ptlrpc_free_req(request);
 395
 396         RETURN(err);
 397 }
 398
 399 int ll_mdc_link(struct dentry *src, struct inode *dir,
 400                 const char *name, int len)
 401 {
 402         struct ptlrpc_request *request = NULL;
 403         int err;
 404         struct ll_sb_info *sbi = ll_i2sbi(dir);
 405
 406         ENTRY;
 407
 408         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
 409                        len, &request);
 410         ptlrpc_free_req(request);
 411
 412         RETURN(err);
 413 }
 414
 415 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 416                   struct dentry *old, struct dentry *new)
 417 {
 418         struct ptlrpc_request *request = NULL;
 419         struct ll_sb_info *sbi = ll_i2sbi(src);
 420         int err;
 421
 422         ENTRY;
 423
 424         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 425                          old->d_name.name, old->d_name.len,
 426                          new->d_name.name, new->d_name.len, &request);
 427         ptlrpc_free_req(request);
 428
 429         RETURN(err);
 430 }
 431
 432 /*
 433  * By the time this is called, we already have created
 434  * the directory cache entry for the new file, but it
 435  * is so far negative - it has no inode.
 436  *
 437  * If the create succeeds, we fill in the inode information
 438  * with d_instantiate().
 439  */
 440
 441 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
 442 {
 443         int err, rc = 0;
 444         struct obdo oa;
 445         struct inode *inode;
 446         struct lov_stripe_md *lsm = NULL;
 447         struct ll_inode_info *lli = NULL;
 448         ENTRY;
 449
 450         CHECK_MOUNT_EPOCH(dir);
 451
 452         if (dentry->d_it->it_disposition == 0) {
 453                 memset(&oa, 0, sizeof(oa));
 454                 oa.o_mode = S_IFREG | 0600;
 455                 oa.o_valid = OBD_MD_FLTYPE | OBD_MD_FLMODE;
 456                 rc = obd_create(ll_i2obdconn(dir), &oa, &lsm);
 457                 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld: rc = %d\n",
 458                        dentry->d_name.name, mode, (long long)oa.o_id, rc);
 459                 if (rc)
 460                         RETURN(rc);
 461         }
 462
 463         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 464                                NULL, 0, mode, 0, dentry->d_it, lsm);
 465
 466         if (IS_ERR(inode)) {
 467                 rc = PTR_ERR(inode);
 468                 CERROR("error creating MDS object for id %Ld: rc = %d\n",
 469                        (unsigned long long)oa.o_id, rc);
 470                 GOTO(out_destroy, rc);
 471         }
 472
 473         if (dentry->d_it->it_disposition) {
 474                 lli = ll_i2info(inode);
 475                 memcpy(&lli->lli_intent_lock_handle,
 476                        dentry->d_it->it_lock_handle,
 477                        sizeof(struct lustre_handle));
 478                 d_instantiate(dentry, inode);
 479         } else {
 480                 /* no directory data updates when intents rule */
 481                 rc = ext2_add_nondir(dentry, inode);
 482         }
 483
 484         RETURN(rc);
 485
 486 out_destroy:
 487         if (lsm) {
 488                 oa.o_easize = ll_mds_easize(inode->i_sb);
 489                 oa.o_valid |= OBD_MD_FLEASIZE;
 490                 err = obd_destroy(ll_i2obdconn(dir), &oa, lsm);
 491                 if (err)
 492                         CERROR("error destroying objid %Ld on error: err %d\n",
 493                        (unsigned long long)oa.o_id, err);
 494         }
 495
 496         return rc;
 497 }
 498
 499 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 500                     int rdev)
 501 {
 502         struct inode *inode;
 503         int err = 0;
 504
 505         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 506                                NULL, 0, mode, rdev, dentry->d_it, NULL);
 507
 508         if (IS_ERR(inode))
 509                 RETURN(PTR_ERR(inode));
 510
 511         /* no directory data updates when intents rule */
 512         if (dentry->d_it && dentry->d_it->it_disposition)
 513                 d_instantiate(dentry, inode);
 514         else
 515                 err = ext2_add_nondir(dentry, inode);
 516
 517         return err;
 518 }
 519
 520 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 521                       const char *symname)
 522 {
 523         unsigned l = strlen(symname);
 524         struct inode *inode;
 525         struct ll_inode_info *lli;
 526         int err = 0;
 527         ENTRY;
 528
 529         CHECK_MOUNT_EPOCH(dir);
 530
 531         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 532                                symname, l, S_IFLNK | S_IRWXUGO, 0,
 533                                dentry->d_it, NULL);
 534         if (IS_ERR(inode))
 535                 RETURN(PTR_ERR(inode));
 536
 537         lli = ll_i2info(inode);
 538
 539         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 540         /* this _could_ be a non-fatal error, since the symlink is already
 541          * stored on the MDS by this point, and we can re-get it in readlink.
 542          */
 543         if (!lli->lli_symlink_name)
 544                 RETURN(-ENOMEM);
 545
 546         memcpy(lli->lli_symlink_name, symname, l + 1);
 547         inode->i_size = l;
 548
 549         /* no directory data updates when intents rule */
 550         if (dentry->d_it && dentry->d_it->it_disposition)
 551                 d_instantiate(dentry, inode);
 552         else
 553                 err = ext2_add_nondir(dentry, inode);
 554
 555         RETURN(err);
 556 }
 557
 558 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 559                    struct dentry *dentry)
 560 {
 561         int err;
 562         struct inode *inode = old_dentry->d_inode;
 563
 564         if (dentry->d_it && dentry->d_it->it_disposition) {
 565                 int err = dentry->d_it->it_status;
 566                 if (err)
 567                         RETURN(err);
 568                 inode->i_ctime = CURRENT_TIME;
 569                 ext2_inc_count(inode);
 570                 atomic_inc(&inode->i_count);
 571                 d_instantiate(dentry, inode);
 572                 invalidate_inode_pages(dir);
 573                 RETURN(err);
 574         }
 575
 576         if (S_ISDIR(inode->i_mode))
 577                 return -EPERM;
 578
 579         if (inode->i_nlink >= EXT2_LINK_MAX)
 580                 return -EMLINK;
 581
 582         err = ll_mdc_link(old_dentry, dir,
 583                           dentry->d_name.name, dentry->d_name.len);
 584         if (err)
 585                 RETURN(err);
 586
 587         inode->i_ctime = CURRENT_TIME;
 588         ext2_inc_count(inode);
 589         atomic_inc(&inode->i_count);
 590
 591         return ext2_add_nondir(dentry, inode);
 592 }
 593
 594 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 595 {
 596         struct inode * inode;
 597         int err = -EMLINK;
 598         ENTRY;
 599
 600         if (dir->i_nlink >= EXT2_LINK_MAX)
 601                 goto out;
 602
 603         ext2_inc_count(dir);
 604
 605         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 606                                NULL, 0, S_IFDIR | mode, 0, dentry->d_it, NULL);
 607         err = PTR_ERR(inode);
 608         if (IS_ERR(inode))
 609                 goto out_dir;
 610
 611         ext2_inc_count(inode);
 612
 613         err = ext2_make_empty(inode, dir);
 614         if (err)
 615                 goto out_fail;
 616
 617         /* no directory data updates when intents rule */
 618         if (dentry->d_it->it_disposition == 0) {
 619                 err = ll_add_link(dentry, inode);
 620                 if (err)
 621                         goto out_fail;
 622         }
 623
 624         d_instantiate(dentry, inode);
 625 out:
 626         EXIT;
 627         return err;
 628
 629 out_fail:
 630         ext2_dec_count(inode);
 631         ext2_dec_count(inode);
 632         iput(inode);
 633         EXIT;
 634 out_dir:
 635         ext2_dec_count(dir);
 636         EXIT;
 637         goto out;
 638 }
 639
 640 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 641                             __u32 mode)
 642 {
 643         struct inode * inode = dentry->d_inode;
 644 #if 0
 645         struct ext2_dir_entry_2 * de;
 646         struct page * page;
 647 #endif
 648         int err = -ENOENT;
 649
 650         if (dentry->d_it && dentry->d_it->it_disposition) {
 651                 err = dentry->d_it->it_status;
 652                 invalidate_inode_pages(dir);
 653                 GOTO(out, err);
 654         }
 655
 656 #if 0
 657         de = ext2_find_entry(dir, dentry, &page);
 658         if (!de)
 659                 goto out;
 660 #endif
 661         err = ll_mdc_unlink(dir, dentry->d_inode, mode,
 662                             dentry->d_name.name, dentry->d_name.len);
 663         if (err)
 664                 goto out;
 665
 666 #if 0
 667         err = ext2_delete_entry(de, page);
 668         if (err)
 669                 goto out;
 670 #endif
 671         invalidate_inode_pages(dir);
 672
 673         inode->i_ctime = dir->i_ctime;
 674 out:
 675         ext2_dec_count(inode);
 676         return err;
 677 }
 678
 679 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 680 {
 681         return ll_common_unlink(dir, dentry, S_IFREG);
 682 }
 683
 684 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 685 {
 686         struct inode * inode = dentry->d_inode;
 687         int err = 0;
 688         ENTRY;
 689
 690         if (!dentry->d_it || dentry->d_it->it_disposition == 0) {
 691                 if (!ext2_empty_dir(inode))
 692                         LBUG();
 693                 err = ll_common_unlink(dir, dentry, S_IFDIR);
 694         } else
 695                 err = dentry->d_it->it_status;
 696         if (err)
 697                 RETURN(err);
 698         inode->i_size = 0;
 699         ext2_dec_count(inode);
 700         ext2_dec_count(dir);
 701         RETURN(err);
 702 }
 703
 704 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 705                      struct inode * new_dir, struct dentry * new_dentry)
 706 {
 707         struct inode * old_inode = old_dentry->d_inode;
 708         struct inode * tgt_inode = new_dentry->d_inode;
 709         struct page * dir_page = NULL;
 710         struct ext2_dir_entry_2 * dir_de = NULL;
 711         struct ext2_dir_entry_2 * old_de;
 712         struct page * old_page;
 713         int err = -ENOENT;
 714
 715         if (new_dentry->d_it && new_dentry->d_it->it_disposition) {
 716                 if (tgt_inode) {
 717                         tgt_inode->i_ctime = CURRENT_TIME;
 718                         tgt_inode->i_nlink--;
 719                 }
 720                 invalidate_inode_pages(old_dir);
 721                 invalidate_inode_pages(new_dir);
 722                 GOTO(out, err = new_dentry->d_it->it_status);
 723         }
 724
 725         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 726         if (err)
 727                 goto out;
 728
 729         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 730         if (!old_de)
 731                 goto out;
 732
 733         if (S_ISDIR(old_inode->i_mode)) {
 734                 err = -EIO;
 735                 dir_de = ext2_dotdot(old_inode, &dir_page);
 736                 if (!dir_de)
 737                         goto out_old;
 738         }
 739
 740         if (tgt_inode) {
 741                 struct page *new_page;
 742                 struct ext2_dir_entry_2 *new_de;
 743
 744                 err = -ENOTEMPTY;
 745                 if (dir_de && !ext2_empty_dir (tgt_inode))
 746                         goto out_dir;
 747
 748                 err = -ENOENT;
 749                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 750                 if (!new_de)
 751                         goto out_dir;
 752                 ext2_inc_count(old_inode);
 753                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 754                 tgt_inode->i_ctime = CURRENT_TIME;
 755                 if (dir_de)
 756                         tgt_inode->i_nlink--;
 757                 ext2_dec_count(tgt_inode);
 758         } else {
 759                 if (dir_de) {
 760                         err = -EMLINK;
 761                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 762                                 goto out_dir;
 763                 }
 764                 ext2_inc_count(old_inode);
 765                 err = ll_add_link(new_dentry, old_inode);
 766                 if (err) {
 767                         ext2_dec_count(old_inode);
 768                         goto out_dir;
 769                 }
 770                 if (dir_de)
 771                         ext2_inc_count(new_dir);
 772         }
 773
 774         ext2_delete_entry (old_de, old_page);
 775         ext2_dec_count(old_inode);
 776
 777         if (dir_de) {
 778                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 779                 ext2_dec_count(old_dir);
 780         }
 781         return 0;
 782
 783 out_dir:
 784         if (dir_de) {
 785                 kunmap(dir_page);
 786                 page_cache_release(dir_page);
 787         }
 788 out_old:
 789         kunmap(old_page);
 790         page_cache_release(old_page);
 791 out:
 792         return err;
 793 }
 794
 795 struct inode_operations ll_dir_inode_operations = {
 796         create:         ll_create,
 797         lookup2:        ll_lookup2,
 798         link:           ll_link,
 799         unlink:         ll_unlink,
 800         symlink:        ll_symlink,
 801         mkdir:          ll_mkdir,
 802         rmdir:          ll_rmdir,
 803         mknod:          ll_mknod,
 804         rename:         ll_rename,
 805         setattr:        ll_setattr
 806 };