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