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         /* CREAT needs to be tested before open (both could be set) */
 112         if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SETATTR | IT_MKNOD))) {
 113                 lock_mode = LCK_PW;
 114         } else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
 115                                 IT_RMDIR | IT_RENAME | IT_RENAME2 | IT_READLINK|
 116                                 IT_LINK | IT_LINK2 | IT_LOOKUP)) {
 117                 /* XXXphil PW for LINK2/RENAME2? */
 118                 lock_mode = LCK_PR;
 119         } else if (it->it_op & IT_SYMLINK) {
 120                 lock_mode = LCK_PW;
 121                 tgt = it->it_data;
 122                 tgtlen = strlen(tgt);
 123                 it->it_data = NULL;
 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                 make_bad_inode(dir);
 161                 RETURN(ERR_PTR(-EIO));
 162         }
 163
 164         if (it == NULL) {
 165                 it = &lookup_it;
 166                 dentry->d_it = it;
 167         }
 168
 169         CDEBUG(D_INFO, "name: %*s, intent: %s\n", dentry->d_name.len,
 170                dentry->d_name.name, ldlm_it2str(it->it_op));
 171
 172         if (dentry->d_name.len > EXT2_NAME_LEN)
 173                 RETURN(ERR_PTR(-ENAMETOOLONG));
 174
 175         err = ll_lock(dir, dentry, it, &lockh);
 176         if (err < 0)
 177                 RETURN(ERR_PTR(err));
 178         memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
 179
 180         request = (struct ptlrpc_request *)it->it_data;
 181         if (it->it_disposition) {
 182                 int mode, symlen = 0;
 183                 obd_flag valid;
 184
 185                 offset = 1;
 186                 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 187                 ino = lic.lic_body->fid1.id;
 188                 mode = lic.lic_body->mode;
 189                 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
 190                         /* For create ops, we want the lookup to be negative,
 191                          * unless the create failed in a way that indicates
 192                          * that the file is already there */
 193                         if (it->it_status != -EEXIST)
 194                                 GOTO(negative, NULL);
 195                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP)) {
 196                         /* For check ops, we want the lookup to succeed */
 197                         it->it_data = NULL;
 198                         if (it->it_status)
 199                                 GOTO(neg_req, NULL);
 200                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 201                         /* For rename, we want the lookup to succeed */
 202                         if (it->it_status) {
 203                                 it->it_data = NULL;
 204                                 GOTO(neg_req, NULL);
 205                         }
 206                         it->it_data = dentry;
 207                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 208                         /* For remove ops, we want the lookup to succeed unless
 209                          * the file truly doesn't exist */
 210                         it->it_data = NULL;
 211                         if (it->it_status == -ENOENT)
 212                                 GOTO(neg_req, NULL);
 213                         goto iget;
 214                 } else if (it->it_op == IT_OPEN) {
 215                         it->it_data = NULL;
 216                         if (it->it_status && it->it_status != -EEXIST)
 217                                 GOTO(neg_req, NULL);
 218                 } else if (it->it_op & (IT_RENAME2|IT_LINK2)) {
 219                         struct mds_body *body =
 220                                 lustre_msg_buf(request->rq_repmsg, offset);
 221                         it->it_data = NULL;
 222                         /* For rename2, this means the lookup is negative */
 223                         /* For link2 also */
 224                         if (body->valid == 0)
 225                                 GOTO(neg_req, NULL);
 226                         goto iget;
 227                 }
 228
 229                 /* Do a getattr now that we have the lock */
 230                 valid = OBD_MD_FLNOTOBD | OBD_MD_FLEASIZE;
 231                 if (it->it_op == IT_READLINK) {
 232                         valid |= OBD_MD_LINKNAME;
 233                         symlen = lic.lic_body->size;
 234                 }
 235                 ptlrpc_req_finished(request);
 236                 request = NULL;
 237                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 238                                   valid, symlen, &request);
 239                 if (err) {
 240                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 241                         GOTO(drop_req, err = -abs(err));
 242                 }
 243                 offset = 0;
 244         } else {
 245                 struct ll_inode_info *lli = ll_i2info(dir);
 246                 int mode;
 247
 248                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 249                 offset = 0;
 250
 251                 ino = ll_inode_by_name(dir, dentry, &mode);
 252                 if (!ino) {
 253                         CERROR("inode %*s not found by name\n",
 254                                dentry->d_name.len, dentry->d_name.name);
 255                         GOTO(drop_lock, err = -ENOENT);
 256                 }
 257
 258                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 259                                   OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 260                 if (err) {
 261                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 262                         GOTO(drop_req, err = -abs(err));
 263                 }
 264         }
 265
 266  iget:
 267         lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 268         if (S_ISREG(lic.lic_body->mode) &&
 269             lic.lic_body->valid & OBD_MD_FLEASIZE) {
 270                 LASSERT(request->rq_repmsg->bufcount > offset);
 271                 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
 272         } else
 273                 lic.lic_lmm = NULL;
 274
 275         /* No rpc's happen during iget4, -ENOMEM's are possible */
 276         LASSERT(ino != 0);
 277         inode = iget4(dir->i_sb, ino, ll_find_inode, &lic);
 278
 279         if (!inode) {
 280                 ptlrpc_free_req(request);
 281                 ll_intent_release(dentry);
 282                 RETURN(ERR_PTR(-ENOMEM));
 283         }
 284
 285         EXIT;
 286  neg_req:
 287         ptlrpc_req_finished(request);
 288  negative:
 289         dentry->d_op = &ll_d_ops;
 290         d_add(dentry, inode);
 291
 292         if (ll_d2d(dentry) == NULL)
 293                 ll_set_dd(dentry);
 294         // down(&ll_d2d(dentry)->lld_it_sem);
 295         // dentry->d_it = it;
 296
 297         if (it->it_op == IT_LOOKUP)
 298                 ll_intent_release(dentry);
 299
 300         return NULL;
 301
 302  drop_req:
 303         ptlrpc_free_req(request);
 304  drop_lock:
 305 #warning FIXME: must release lock here
 306         return ERR_PTR(err);
 307 }
 308
 309 static struct inode *ll_create_node(struct inode *dir, const char *name,
 310                                     int namelen, const char *tgt, int tgtlen,
 311                                     int mode, __u64 extra,
 312                                     struct lookup_intent *it,
 313                                     struct lov_stripe_md *lsm)
 314 {
 315         struct inode *inode;
 316         struct ptlrpc_request *request = NULL;
 317         struct mds_body *body;
 318         int rc;
 319         time_t time = CURRENT_TIME;
 320         struct ll_sb_info *sbi = ll_i2sbi(dir);
 321         int gid = current->fsgid;
 322         struct ll_read_inode2_cookie lic;
 323         struct lov_mds_md *lmm = NULL;
 324         int mds_md_size = 0;
 325
 326         ENTRY;
 327
 328         if (dir->i_mode & S_ISGID) {
 329                 gid = dir->i_gid;
 330                 if (S_ISDIR(mode))
 331                         mode |= S_ISGID;
 332         }
 333
 334         if (!it || !it->it_disposition) {
 335                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 336                                  tgtlen, mode, current->fsuid,
 337                                  gid, time, extra, lsm, &request);
 338                 if (rc) {
 339                         inode = ERR_PTR(rc);
 340                         GOTO(out, rc);
 341                 }
 342                 body = lustre_msg_buf(request->rq_repmsg, 0);
 343                 if (lsm != NULL) {
 344                         OBD_ALLOC(lmm, lsm->lsm_mds_easize);
 345                         lov_packmd(lmm, lsm);
 346                         lic.lic_lmm = lmm;
 347                 } else
 348                         lic.lic_lmm = NULL;
 349
 350         } else {
 351                 invalidate_inode_pages(dir);
 352                 request = it->it_data;
 353                 body = lustre_msg_buf(request->rq_repmsg, 1);
 354                 lic.lic_lmm = NULL;
 355         }
 356
 357         body->valid = OBD_MD_FLNOTOBD;
 358
 359         body->nlink = 1;
 360         body->atime = body->ctime = body->mtime = time;
 361         body->uid = current->fsuid;
 362         body->gid = gid;
 363         body->mode = mode;
 364
 365         lic.lic_body = body;
 366
 367         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 368         if (IS_ERR(inode)) {
 369                 rc = PTR_ERR(inode);
 370                 CERROR("new_inode -fatal: rc %d\n", rc);
 371                 LBUG();
 372                 GOTO(out, rc);
 373         }
 374
 375         if (!list_empty(&inode->i_dentry)) {
 376                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 377                        body->ino, atomic_read(&inode->i_count),
 378                        inode->i_nlink);
 379                 iput(inode);
 380                 LBUG();
 381                 inode = ERR_PTR(-EIO);
 382                 GOTO(out, -EIO);
 383         }
 384
 385         EXIT;
 386  out:
 387         if (lmm)
 388                 OBD_FREE(lmm, mds_md_size);
 389         ptlrpc_req_finished(request);
 390         return inode;
 391 }
 392
 393 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 394                          const char *name, int len)
 395 {
 396         struct ptlrpc_request *request = NULL;
 397         struct ll_sb_info *sbi = ll_i2sbi(dir);
 398         int err;
 399
 400         ENTRY;
 401
 402         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 403                          &request);
 404         ptlrpc_req_finished(request);
 405
 406         RETURN(err);
 407 }
 408
 409 int ll_mdc_link(struct dentry *src, struct inode *dir,
 410                 const char *name, int len)
 411 {
 412         struct ptlrpc_request *request = NULL;
 413         int err;
 414         struct ll_sb_info *sbi = ll_i2sbi(dir);
 415
 416         ENTRY;
 417
 418         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
 419                        len, &request);
 420         ptlrpc_req_finished(request);
 421
 422         RETURN(err);
 423 }
 424
 425 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 426                   struct dentry *old, struct dentry *new)
 427 {
 428         struct ptlrpc_request *request = NULL;
 429         struct ll_sb_info *sbi = ll_i2sbi(src);
 430         int err;
 431
 432         ENTRY;
 433
 434         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 435                          old->d_name.name, old->d_name.len,
 436                          new->d_name.name, new->d_name.len, &request);
 437         ptlrpc_req_finished(request);
 438
 439         RETURN(err);
 440 }
 441
 442 /*
 443  * By the time this is called, we already have created
 444  * the directory cache entry for the new file, but it
 445  * is so far negative - it has no inode.
 446  *
 447  * If the create succeeds, we fill in the inode information
 448  * with d_instantiate().
 449  */
 450
 451 static int ll_create(struct inode *dir, struct dentry *dentry, int mode)
 452 {
 453         int err, rc = 0;
 454         struct inode *inode;
 455         struct lov_stripe_md *lsm = NULL;
 456         struct ll_inode_info *lli = NULL;
 457         ENTRY;
 458
 459         CHECK_MOUNT_EPOCH(dir);
 460
 461         if (dentry->d_it->it_disposition == 0) {
 462                 /* FIXME: we set the UID/GID fields to 0 for now, because it
 463                  *        fixes a bug on the BA OSTs.  We should really set
 464                  *        them properly, and this needs to be revisited when
 465                  *        we do proper credentials checking on the OST, and
 466                  *        set the attributes on the OST in ll_inode_setattr().
 467                  *        See also ll_file_open() and ll_lov_setstripe().
 468                 gid_t gid = current->fsgid;
 469
 470                 if (dir->i_mode & S_ISGID)
 471                         gid = dir->i_gid;
 472                 rc = ll_create_objects(ll_i2obdconn(dir), 0, current->fsuid,
 473                                        gid, &lsm);
 474                 */
 475                 rc = ll_create_objects(dir->i_sb, 0, 0, 0, &lsm);
 476                 CDEBUG(D_DENTRY, "name %*s mode %o: rc = %d\n",
 477                        dentry->d_name.len, dentry->d_name.name, mode, rc);
 478                 if (rc)
 479                         GOTO(out_free, rc);
 480         }
 481
 482         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 483                                NULL, 0, mode, 0, dentry->d_it, lsm);
 484
 485         if (IS_ERR(inode)) {
 486                 rc = PTR_ERR(inode);
 487                 CERROR("error creating MDS object for %*s: rc = %d\n",
 488                        dentry->d_name.len, dentry->d_name.name, rc);
 489                 GOTO(out_destroy, rc);
 490         }
 491
 492         if (dentry->d_it->it_disposition) {
 493                 lli = ll_i2info(inode);
 494                 memcpy(&lli->lli_intent_lock_handle,
 495                        dentry->d_it->it_lock_handle,
 496                        sizeof(struct lustre_handle));
 497                 d_instantiate(dentry, inode);
 498         } else {
 499                 /* no directory data updates when intents rule */
 500                 rc = ext2_add_nondir(dentry, inode);
 501         }
 502
 503 out_free:
 504         RETURN(rc);
 505
 506 out_destroy:
 507         if (lsm) {
 508                 struct obdo *oa;
 509                 oa = obdo_alloc();
 510                 if (oa) {
 511                         oa->o_easize = lsm->lsm_mds_easize;
 512                         oa->o_id = lsm->lsm_object_id;
 513                         oa->o_valid |= OBD_MD_FLID | OBD_MD_FLEASIZE;
 514                         err = obd_destroy(ll_i2obdconn(dir), oa, lsm);
 515                         obdo_free(oa);
 516                 } else
 517                         err = -ENOMEM;
 518                 if (err)
 519                         CERROR("error uncreating objid "LPX64": err %d\n",
 520                                lsm->lsm_object_id, err);
 521                 OBD_FREE(lsm, ll_ost_easize(dir->i_sb));
 522         }
 523
 524         goto out_free;
 525 }
 526
 527 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 528                     int rdev)
 529 {
 530         struct inode *inode;
 531         int err = 0;
 532
 533         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 534                                NULL, 0, mode, rdev, dentry->d_it, NULL);
 535
 536         if (IS_ERR(inode))
 537                 RETURN(PTR_ERR(inode));
 538
 539         /* no directory data updates when intents rule */
 540         if (dentry->d_it && dentry->d_it->it_disposition)
 541                 d_instantiate(dentry, inode);
 542         else
 543                 err = ext2_add_nondir(dentry, inode);
 544
 545         return err;
 546 }
 547
 548 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 549                       const char *symname)
 550 {
 551         unsigned l = strlen(symname);
 552         struct inode *inode;
 553         struct ll_inode_info *lli;
 554         int err = 0;
 555         ENTRY;
 556
 557         CHECK_MOUNT_EPOCH(dir);
 558
 559         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 560                                symname, l, S_IFLNK | S_IRWXUGO, 0,
 561                                dentry->d_it, NULL);
 562         if (IS_ERR(inode))
 563                 RETURN(PTR_ERR(inode));
 564
 565         lli = ll_i2info(inode);
 566
 567         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 568         /* this _could_ be a non-fatal error, since the symlink is already
 569          * stored on the MDS by this point, and we can re-get it in readlink.
 570          */
 571         if (!lli->lli_symlink_name)
 572                 RETURN(-ENOMEM);
 573
 574         memcpy(lli->lli_symlink_name, symname, l + 1);
 575         inode->i_size = l;
 576
 577         /* no directory data updates when intents rule */
 578         if (dentry->d_it && dentry->d_it->it_disposition)
 579                 d_instantiate(dentry, inode);
 580         else
 581                 err = ext2_add_nondir(dentry, inode);
 582
 583         RETURN(err);
 584 }
 585
 586 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 587                    struct dentry *dentry)
 588 {
 589         int err;
 590         struct inode *inode = old_dentry->d_inode;
 591
 592         if (dentry->d_it && dentry->d_it->it_disposition) {
 593                 int err = dentry->d_it->it_status;
 594                 if (err)
 595                         RETURN(err);
 596                 inode->i_ctime = CURRENT_TIME;
 597                 ext2_inc_count(inode);
 598                 atomic_inc(&inode->i_count);
 599                 d_instantiate(dentry, inode);
 600                 invalidate_inode_pages(dir);
 601                 RETURN(err);
 602         }
 603
 604         if (S_ISDIR(inode->i_mode))
 605                 return -EPERM;
 606
 607         if (inode->i_nlink >= EXT2_LINK_MAX)
 608                 return -EMLINK;
 609
 610         err = ll_mdc_link(old_dentry, dir,
 611                           dentry->d_name.name, dentry->d_name.len);
 612         if (err)
 613                 RETURN(err);
 614
 615         inode->i_ctime = CURRENT_TIME;
 616         ext2_inc_count(inode);
 617         atomic_inc(&inode->i_count);
 618
 619         return ext2_add_nondir(dentry, inode);
 620 }
 621
 622 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 623 {
 624         struct inode * inode;
 625         int err = -EMLINK;
 626         ENTRY;
 627
 628         if (dir->i_nlink >= EXT2_LINK_MAX)
 629                 goto out;
 630
 631         ext2_inc_count(dir);
 632
 633         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 634                                NULL, 0, S_IFDIR | mode, 0, dentry->d_it, NULL);
 635         err = PTR_ERR(inode);
 636         if (IS_ERR(inode))
 637                 goto out_dir;
 638
 639         ext2_inc_count(inode);
 640
 641         err = ext2_make_empty(inode, dir);
 642         if (err)
 643                 goto out_fail;
 644
 645         /* no directory data updates when intents rule */
 646         if (dentry->d_it->it_disposition == 0) {
 647                 err = ll_add_link(dentry, inode);
 648                 if (err)
 649                         goto out_fail;
 650         }
 651
 652         d_instantiate(dentry, inode);
 653 out:
 654         EXIT;
 655         return err;
 656
 657 out_fail:
 658         ext2_dec_count(inode);
 659         ext2_dec_count(inode);
 660         iput(inode);
 661         EXIT;
 662 out_dir:
 663         ext2_dec_count(dir);
 664         EXIT;
 665         goto out;
 666 }
 667
 668 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 669                             __u32 mode)
 670 {
 671         struct inode * inode = dentry->d_inode;
 672 #if 0
 673         struct ext2_dir_entry_2 * de;
 674         struct page * page;
 675 #endif
 676         int err = -ENOENT;
 677
 678         if (dentry->d_it && dentry->d_it->it_disposition) {
 679                 err = dentry->d_it->it_status;
 680                 invalidate_inode_pages(dir);
 681                 GOTO(out, err);
 682         }
 683
 684 #if 0
 685         de = ext2_find_entry(dir, dentry, &page);
 686         if (!de)
 687                 goto out;
 688 #endif
 689         err = ll_mdc_unlink(dir, dentry->d_inode, mode,
 690                             dentry->d_name.name, dentry->d_name.len);
 691         if (err)
 692                 goto out;
 693
 694 #if 0
 695         err = ext2_delete_entry(de, page);
 696         if (err)
 697                 goto out;
 698 #endif
 699         invalidate_inode_pages(dir);
 700
 701         inode->i_ctime = dir->i_ctime;
 702 out:
 703         ext2_dec_count(inode);
 704         return err;
 705 }
 706
 707 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 708 {
 709         return ll_common_unlink(dir, dentry, S_IFREG);
 710 }
 711
 712 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 713 {
 714         struct inode * inode = dentry->d_inode;
 715         int err = 0;
 716         ENTRY;
 717
 718         if (!dentry->d_it || dentry->d_it->it_disposition == 0) {
 719                 if (!ext2_empty_dir(inode))
 720                         RETURN(-ENOTEMPTY);
 721                 err = ll_common_unlink(dir, dentry, S_IFDIR);
 722         } else
 723                 err = dentry->d_it->it_status;
 724         if (err)
 725                 RETURN(err);
 726         inode->i_size = 0;
 727         ext2_dec_count(inode);
 728         ext2_dec_count(dir);
 729         RETURN(err);
 730 }
 731
 732 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 733                      struct inode * new_dir, struct dentry * new_dentry)
 734 {
 735         struct inode * old_inode = old_dentry->d_inode;
 736         struct inode * tgt_inode = new_dentry->d_inode;
 737         struct page * dir_page = NULL;
 738         struct ext2_dir_entry_2 * dir_de = NULL;
 739         struct ext2_dir_entry_2 * old_de;
 740         struct page * old_page;
 741         int err = -ENOENT;
 742
 743         if (new_dentry->d_it && new_dentry->d_it->it_disposition) {
 744                 if (tgt_inode) {
 745                         tgt_inode->i_ctime = CURRENT_TIME;
 746                         tgt_inode->i_nlink--;
 747                 }
 748                 invalidate_inode_pages(old_dir);
 749                 invalidate_inode_pages(new_dir);
 750                 GOTO(out, err = new_dentry->d_it->it_status);
 751         }
 752
 753         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 754         if (err)
 755                 goto out;
 756
 757         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 758         if (!old_de)
 759                 goto out;
 760
 761         if (S_ISDIR(old_inode->i_mode)) {
 762                 err = -EIO;
 763                 dir_de = ext2_dotdot(old_inode, &dir_page);
 764                 if (!dir_de)
 765                         goto out_old;
 766         }
 767
 768         if (tgt_inode) {
 769                 struct page *new_page;
 770                 struct ext2_dir_entry_2 *new_de;
 771
 772                 err = -ENOTEMPTY;
 773                 if (dir_de && !ext2_empty_dir (tgt_inode))
 774                         goto out_dir;
 775
 776                 err = -ENOENT;
 777                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 778                 if (!new_de)
 779                         goto out_dir;
 780                 ext2_inc_count(old_inode);
 781                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 782                 tgt_inode->i_ctime = CURRENT_TIME;
 783                 if (dir_de)
 784                         tgt_inode->i_nlink--;
 785                 ext2_dec_count(tgt_inode);
 786         } else {
 787                 if (dir_de) {
 788                         err = -EMLINK;
 789                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 790                                 goto out_dir;
 791                 }
 792                 ext2_inc_count(old_inode);
 793                 err = ll_add_link(new_dentry, old_inode);
 794                 if (err) {
 795                         ext2_dec_count(old_inode);
 796                         goto out_dir;
 797                 }
 798                 if (dir_de)
 799                         ext2_inc_count(new_dir);
 800         }
 801
 802         ext2_delete_entry (old_de, old_page);
 803         ext2_dec_count(old_inode);
 804
 805         if (dir_de) {
 806                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 807                 ext2_dec_count(old_dir);
 808         }
 809         return 0;
 810
 811 out_dir:
 812         if (dir_de) {
 813                 kunmap(dir_page);
 814                 page_cache_release(dir_page);
 815         }
 816 out_old:
 817         kunmap(old_page);
 818         page_cache_release(old_page);
 819 out:
 820         return err;
 821 }
 822
 823 struct inode_operations ll_dir_inode_operations = {
 824         create:         ll_create,
 825         lookup2:        ll_lookup2,
 826         link:           ll_link,
 827         unlink:         ll_unlink,
 828         symlink:        ll_symlink,
 829         mkdir:          ll_mkdir,
 830         rmdir:          ll_rmdir,
 831         mknod:          ll_mknod,
 832         rename:         ll_rename,
 833         setattr:        ll_setattr
 834 };