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: %s\n", dentry->d_name.len,
 168                dentry->d_name.name, ldlm_it2str(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                          * unless the create failed in a way that indicates
 190                          * that the file is already there */
 191                         if (it->it_status != -EEXIST)
 192                                 GOTO(negative, NULL);
 193                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP)) {
 194                         /* For check ops, we want the lookup to succeed */
 195                         it->it_data = NULL;
 196                         if (it->it_status)
 197                                 GOTO(neg_req, NULL);
 198                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 199                         /* For rename, we want the lookup to succeed */
 200                         if (it->it_status) {
 201                                 it->it_data = NULL;
 202                                 GOTO(neg_req, NULL);
 203                         }
 204                         it->it_data = dentry;
 205                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 206                         /* For remove ops, we want the lookup to succeed unless
 207                          * the file truly doesn't exist */
 208                         it->it_data = NULL;
 209                         if (it->it_status == -ENOENT)
 210                                 GOTO(neg_req, NULL);
 211                         goto iget;
 212                 } else if (it->it_op == IT_OPEN) {
 213                         it->it_data = NULL;
 214                         if (it->it_status && it->it_status != -EEXIST)
 215                                 GOTO(neg_req, NULL);
 216                 } else if (it->it_op & (IT_RENAME2|IT_LINK2)) {
 217                         struct mds_body *body =
 218                                 lustre_msg_buf(request->rq_repmsg, offset);
 219                         it->it_data = NULL;
 220                         /* For rename2, this means the lookup is negative */
 221                         /* For link2 also */
 222                         if (body->valid == 0)
 223                                 GOTO(neg_req, NULL);
 224                         goto iget;
 225                 }
 226
 227                 /* Do a getattr now that we have the lock */
 228                 valid = OBD_MD_FLNOTOBD | OBD_MD_FLEASIZE;
 229                 if (it->it_op == IT_READLINK) {
 230                         valid |= OBD_MD_LINKNAME;
 231                         symlen = lic.lic_body->size;
 232                 }
 233                 ptlrpc_req_finished(request);
 234                 request = NULL;
 235                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 236                                   valid, symlen, &request);
 237                 if (err) {
 238                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 239                         GOTO(drop_req, err = -abs(err));
 240                 }
 241                 offset = 0;
 242         } else {
 243                 struct ll_inode_info *lli = ll_i2info(dir);
 244                 int mode;
 245
 246                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 247                 offset = 0;
 248
 249                 ino = ll_inode_by_name(dir, dentry, &mode);
 250                 if (!ino) {
 251                         CERROR("inode %*s not found by name\n",
 252                                dentry->d_name.len, dentry->d_name.name);
 253                         GOTO(drop_lock, err = -ENOENT);
 254                 }
 255
 256                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 257                                   OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 258                 if (err) {
 259                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 260                         GOTO(drop_req, err = -abs(err));
 261                 }
 262         }
 263
 264  iget:
 265         lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 266         if (S_ISREG(lic.lic_body->mode) &&
 267             lic.lic_body->valid & OBD_MD_FLEASIZE) {
 268                 LASSERT(request->rq_repmsg->bufcount > offset);
 269                 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
 270         } else
 271                 lic.lic_lmm = NULL;
 272
 273         /* No rpc's happen during iget4, -ENOMEM's are possible */
 274         LASSERT(ino != 0);
 275         inode = iget4(dir->i_sb, ino, ll_find_inode, &lic);
 276
 277         if (!inode) {
 278                 ptlrpc_free_req(request);
 279                 ll_intent_release(dentry);
 280                 RETURN(ERR_PTR(-ENOMEM));
 281         }
 282
 283         EXIT;
 284  neg_req:
 285         ptlrpc_req_finished(request);
 286  negative:
 287         dentry->d_op = &ll_d_ops;
 288         d_add(dentry, inode);
 289
 290         if (ll_d2d(dentry) == NULL)
 291                 ll_set_dd(dentry);
 292         // down(&ll_d2d(dentry)->lld_it_sem);
 293         // dentry->d_it = it;
 294
 295         if (it->it_op == IT_LOOKUP)
 296                 ll_intent_release(dentry);
 297
 298         return NULL;
 299
 300  drop_req:
 301         ptlrpc_free_req(request);
 302  drop_lock:
 303 #warning FIXME: must release lock here
 304         return ERR_PTR(err);
 305 }
 306
 307 static struct inode *ll_create_node(struct inode *dir, const char *name,
 308                                     int namelen, const char *tgt, int tgtlen,
 309                                     int mode, __u64 extra,
 310                                     struct lookup_intent *it,
 311                                     struct lov_stripe_md *lsm)
 312 {
 313         struct inode *inode;
 314         struct ptlrpc_request *request = NULL;
 315         struct mds_body *body;
 316         int rc;
 317         time_t time = CURRENT_TIME;
 318         struct ll_sb_info *sbi = ll_i2sbi(dir);
 319         int gid = current->fsgid;
 320         struct ll_read_inode2_cookie lic;
 321         struct lov_mds_md *lmm = NULL;
 322         int mds_md_size = 0;
 323
 324         ENTRY;
 325
 326         if (dir->i_mode & S_ISGID) {
 327                 gid = dir->i_gid;
 328                 if (S_ISDIR(mode))
 329                         mode |= S_ISGID;
 330         }
 331
 332         if (!it || !it->it_disposition) {
 333                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 334                                  tgtlen, mode, current->fsuid,
 335                                  gid, time, extra, lsm, &request);
 336                 if (rc) {
 337                         inode = ERR_PTR(rc);
 338                         GOTO(out, rc);
 339                 }
 340                 body = lustre_msg_buf(request->rq_repmsg, 0);
 341                 if (lsm != NULL) {
 342                         mds_md_size = ll_mds_easize(dir->i_sb);
 343                         OBD_ALLOC(lmm, mds_md_size);
 344                         lov_packmd(lmm, lsm);
 345                         lic.lic_lmm = lmm;
 346                 } else
 347                         lic.lic_lmm = NULL;
 348
 349         } else {
 350                 invalidate_inode_pages(dir);
 351                 request = it->it_data;
 352                 body = lustre_msg_buf(request->rq_repmsg, 1);
 353                 lic.lic_lmm = NULL;
 354         }
 355
 356         body->valid = OBD_MD_FLNOTOBD;
 357
 358         body->nlink = 1;
 359         body->atime = body->ctime = body->mtime = time;
 360         body->uid = current->fsuid;
 361         body->gid = gid;
 362         body->mode = mode;
 363
 364         lic.lic_body = body;
 365
 366         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 367         if (IS_ERR(inode)) {
 368                 rc = PTR_ERR(inode);
 369                 CERROR("new_inode -fatal: rc %d\n", rc);
 370                 LBUG();
 371                 GOTO(out, rc);
 372         }
 373
 374         if (!list_empty(&inode->i_dentry)) {
 375                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 376                        body->ino, atomic_read(&inode->i_count),
 377                        inode->i_nlink);
 378                 iput(inode);
 379                 LBUG();
 380                 inode = ERR_PTR(-EIO);
 381                 GOTO(out, -EIO);
 382         }
 383
 384         EXIT;
 385  out:
 386         if (lmm)
 387                 OBD_FREE(lmm, mds_md_size);
 388         ptlrpc_req_finished(request);
 389         return inode;
 390 }
 391
 392 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 393                          const char *name, int len)
 394 {
 395         struct ptlrpc_request *request = NULL;
 396         struct ll_sb_info *sbi = ll_i2sbi(dir);
 397         int err;
 398
 399         ENTRY;
 400
 401         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 402                          &request);
 403         ptlrpc_req_finished(request);
 404
 405         RETURN(err);
 406 }
 407
 408 int ll_mdc_link(struct dentry *src, struct inode *dir,
 409                 const char *name, int len)
 410 {
 411         struct ptlrpc_request *request = NULL;
 412         int err;
 413         struct ll_sb_info *sbi = ll_i2sbi(dir);
 414
 415         ENTRY;
 416
 417         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
 418                        len, &request);
 419         ptlrpc_req_finished(request);
 420
 421         RETURN(err);
 422 }
 423
 424 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 425                   struct dentry *old, struct dentry *new)
 426 {
 427         struct ptlrpc_request *request = NULL;
 428         struct ll_sb_info *sbi = ll_i2sbi(src);
 429         int err;
 430
 431         ENTRY;
 432
 433         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 434                          old->d_name.name, old->d_name.len,
 435                          new->d_name.name, new->d_name.len, &request);
 436         ptlrpc_req_finished(request);
 437
 438         RETURN(err);
 439 }
 440
 441 /*
 442  * By the time this is called, we already have created
 443  * the directory cache entry for the new file, but it
 444  * is so far negative - it has no inode.
 445  *
 446  * If the create succeeds, we fill in the inode information
 447  * with d_instantiate().
 448  */
 449
 450 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
 451 {
 452         int err, rc = 0;
 453         struct obdo *oa = NULL;
 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                 int gid = current->fsgid;
 463
 464                 if (dir->i_mode & S_ISGID)
 465                         gid = dir->i_gid;
 466
 467                 oa = obdo_alloc();
 468                 if (!oa)
 469                         RETURN(-ENOMEM);
 470
 471                 oa->o_mode = S_IFREG | 0600;
 472                 /* FIXME: we set the UID/GID fields to 0 for now, because it
 473                  *        fixes a bug on the BA OSTs.  We should really set
 474                  *        them properly, and this needs to be revisited when
 475                  *        we do proper credentials checking on the OST, and
 476                  *        set the attributes on the OST in ll_inode_setattr().
 477                 oa->o_uid = current->fsuid;
 478                 oa->o_gid = gid;
 479                  */
 480                 oa->o_uid = 0;
 481                 oa->o_gid = 0;
 482                 oa->o_valid = OBD_MD_FLTYPE | OBD_MD_FLMODE | OBD_MD_FLUID |
 483                         OBD_MD_FLGID;
 484                 rc = obd_create(ll_i2obdconn(dir), oa, &lsm);
 485                 CDEBUG(D_DENTRY, "name %s mode %o o_id "LPX64": rc = %d\n",
 486                        dentry->d_name.name, mode, oa->o_id, rc);
 487                 if (rc)
 488                         GOTO(out_free, rc);
 489         }
 490
 491         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 492                                NULL, 0, mode, 0, dentry->d_it, lsm);
 493
 494         if (IS_ERR(inode)) {
 495                 rc = PTR_ERR(inode);
 496                 CERROR("error creating MDS object for id "LPX64": rc = %d\n",
 497                        oa->o_id, rc);
 498                 GOTO(out_destroy, rc);
 499         }
 500
 501         if (dentry->d_it->it_disposition) {
 502                 lli = ll_i2info(inode);
 503                 memcpy(&lli->lli_intent_lock_handle,
 504                        dentry->d_it->it_lock_handle,
 505                        sizeof(struct lustre_handle));
 506                 d_instantiate(dentry, inode);
 507         } else {
 508                 /* no directory data updates when intents rule */
 509                 rc = ext2_add_nondir(dentry, inode);
 510         }
 511
 512 out_free:
 513         obdo_free(oa);
 514         RETURN(rc);
 515
 516 out_destroy:
 517         if (lsm) {
 518                 if (!oa)
 519                         oa = obdo_alloc();
 520                 if (!oa)
 521                         RETURN(-ENOMEM);
 522
 523                 oa->o_easize = ll_mds_easize(inode->i_sb);
 524                 oa->o_valid |= OBD_MD_FLEASIZE;
 525                 err = obd_destroy(ll_i2obdconn(dir), oa, lsm);
 526                 if (err)
 527                         CERROR("error uncreating objid "LPX64": err %d\n",
 528                                oa->o_id, err);
 529         }
 530
 531         goto out_free;
 532 }
 533
 534 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 535                     int rdev)
 536 {
 537         struct inode *inode;
 538         int err = 0;
 539
 540         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 541                                NULL, 0, mode, rdev, dentry->d_it, NULL);
 542
 543         if (IS_ERR(inode))
 544                 RETURN(PTR_ERR(inode));
 545
 546         /* no directory data updates when intents rule */
 547         if (dentry->d_it && dentry->d_it->it_disposition)
 548                 d_instantiate(dentry, inode);
 549         else
 550                 err = ext2_add_nondir(dentry, inode);
 551
 552         return err;
 553 }
 554
 555 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 556                       const char *symname)
 557 {
 558         unsigned l = strlen(symname);
 559         struct inode *inode;
 560         struct ll_inode_info *lli;
 561         int err = 0;
 562         ENTRY;
 563
 564         CHECK_MOUNT_EPOCH(dir);
 565
 566         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 567                                symname, l, S_IFLNK | S_IRWXUGO, 0,
 568                                dentry->d_it, NULL);
 569         if (IS_ERR(inode))
 570                 RETURN(PTR_ERR(inode));
 571
 572         lli = ll_i2info(inode);
 573
 574         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 575         /* this _could_ be a non-fatal error, since the symlink is already
 576          * stored on the MDS by this point, and we can re-get it in readlink.
 577          */
 578         if (!lli->lli_symlink_name)
 579                 RETURN(-ENOMEM);
 580
 581         memcpy(lli->lli_symlink_name, symname, l + 1);
 582         inode->i_size = l;
 583
 584         /* no directory data updates when intents rule */
 585         if (dentry->d_it && dentry->d_it->it_disposition)
 586                 d_instantiate(dentry, inode);
 587         else
 588                 err = ext2_add_nondir(dentry, inode);
 589
 590         RETURN(err);
 591 }
 592
 593 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 594                    struct dentry *dentry)
 595 {
 596         int err;
 597         struct inode *inode = old_dentry->d_inode;
 598
 599         if (dentry->d_it && dentry->d_it->it_disposition) {
 600                 int err = dentry->d_it->it_status;
 601                 if (err)
 602                         RETURN(err);
 603                 inode->i_ctime = CURRENT_TIME;
 604                 ext2_inc_count(inode);
 605                 atomic_inc(&inode->i_count);
 606                 d_instantiate(dentry, inode);
 607                 invalidate_inode_pages(dir);
 608                 RETURN(err);
 609         }
 610
 611         if (S_ISDIR(inode->i_mode))
 612                 return -EPERM;
 613
 614         if (inode->i_nlink >= EXT2_LINK_MAX)
 615                 return -EMLINK;
 616
 617         err = ll_mdc_link(old_dentry, dir,
 618                           dentry->d_name.name, dentry->d_name.len);
 619         if (err)
 620                 RETURN(err);
 621
 622         inode->i_ctime = CURRENT_TIME;
 623         ext2_inc_count(inode);
 624         atomic_inc(&inode->i_count);
 625
 626         return ext2_add_nondir(dentry, inode);
 627 }
 628
 629 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 630 {
 631         struct inode * inode;
 632         int err = -EMLINK;
 633         ENTRY;
 634
 635         if (dir->i_nlink >= EXT2_LINK_MAX)
 636                 goto out;
 637
 638         ext2_inc_count(dir);
 639
 640         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 641                                NULL, 0, S_IFDIR | mode, 0, dentry->d_it, NULL);
 642         err = PTR_ERR(inode);
 643         if (IS_ERR(inode))
 644                 goto out_dir;
 645
 646         ext2_inc_count(inode);
 647
 648         err = ext2_make_empty(inode, dir);
 649         if (err)
 650                 goto out_fail;
 651
 652         /* no directory data updates when intents rule */
 653         if (dentry->d_it->it_disposition == 0) {
 654                 err = ll_add_link(dentry, inode);
 655                 if (err)
 656                         goto out_fail;
 657         }
 658
 659         d_instantiate(dentry, inode);
 660 out:
 661         EXIT;
 662         return err;
 663
 664 out_fail:
 665         ext2_dec_count(inode);
 666         ext2_dec_count(inode);
 667         iput(inode);
 668         EXIT;
 669 out_dir:
 670         ext2_dec_count(dir);
 671         EXIT;
 672         goto out;
 673 }
 674
 675 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 676                             __u32 mode)
 677 {
 678         struct inode * inode = dentry->d_inode;
 679 #if 0
 680         struct ext2_dir_entry_2 * de;
 681         struct page * page;
 682 #endif
 683         int err = -ENOENT;
 684
 685         if (dentry->d_it && dentry->d_it->it_disposition) {
 686                 err = dentry->d_it->it_status;
 687                 invalidate_inode_pages(dir);
 688                 GOTO(out, err);
 689         }
 690
 691 #if 0
 692         de = ext2_find_entry(dir, dentry, &page);
 693         if (!de)
 694                 goto out;
 695 #endif
 696         err = ll_mdc_unlink(dir, dentry->d_inode, mode,
 697                             dentry->d_name.name, dentry->d_name.len);
 698         if (err)
 699                 goto out;
 700
 701 #if 0
 702         err = ext2_delete_entry(de, page);
 703         if (err)
 704                 goto out;
 705 #endif
 706         invalidate_inode_pages(dir);
 707
 708         inode->i_ctime = dir->i_ctime;
 709 out:
 710         ext2_dec_count(inode);
 711         return err;
 712 }
 713
 714 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 715 {
 716         return ll_common_unlink(dir, dentry, S_IFREG);
 717 }
 718
 719 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 720 {
 721         struct inode * inode = dentry->d_inode;
 722         int err = 0;
 723         ENTRY;
 724
 725         if (!dentry->d_it || dentry->d_it->it_disposition == 0) {
 726                 if (!ext2_empty_dir(inode))
 727                         RETURN(-ENOTEMPTY);
 728                 err = ll_common_unlink(dir, dentry, S_IFDIR);
 729         } else
 730                 err = dentry->d_it->it_status;
 731         if (err)
 732                 RETURN(err);
 733         inode->i_size = 0;
 734         ext2_dec_count(inode);
 735         ext2_dec_count(dir);
 736         RETURN(err);
 737 }
 738
 739 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 740                      struct inode * new_dir, struct dentry * new_dentry)
 741 {
 742         struct inode * old_inode = old_dentry->d_inode;
 743         struct inode * tgt_inode = new_dentry->d_inode;
 744         struct page * dir_page = NULL;
 745         struct ext2_dir_entry_2 * dir_de = NULL;
 746         struct ext2_dir_entry_2 * old_de;
 747         struct page * old_page;
 748         int err = -ENOENT;
 749
 750         if (new_dentry->d_it && new_dentry->d_it->it_disposition) {
 751                 if (tgt_inode) {
 752                         tgt_inode->i_ctime = CURRENT_TIME;
 753                         tgt_inode->i_nlink--;
 754                 }
 755                 invalidate_inode_pages(old_dir);
 756                 invalidate_inode_pages(new_dir);
 757                 GOTO(out, err = new_dentry->d_it->it_status);
 758         }
 759
 760         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 761         if (err)
 762                 goto out;
 763
 764         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 765         if (!old_de)
 766                 goto out;
 767
 768         if (S_ISDIR(old_inode->i_mode)) {
 769                 err = -EIO;
 770                 dir_de = ext2_dotdot(old_inode, &dir_page);
 771                 if (!dir_de)
 772                         goto out_old;
 773         }
 774
 775         if (tgt_inode) {
 776                 struct page *new_page;
 777                 struct ext2_dir_entry_2 *new_de;
 778
 779                 err = -ENOTEMPTY;
 780                 if (dir_de && !ext2_empty_dir (tgt_inode))
 781                         goto out_dir;
 782
 783                 err = -ENOENT;
 784                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 785                 if (!new_de)
 786                         goto out_dir;
 787                 ext2_inc_count(old_inode);
 788                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 789                 tgt_inode->i_ctime = CURRENT_TIME;
 790                 if (dir_de)
 791                         tgt_inode->i_nlink--;
 792                 ext2_dec_count(tgt_inode);
 793         } else {
 794                 if (dir_de) {
 795                         err = -EMLINK;
 796                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 797                                 goto out_dir;
 798                 }
 799                 ext2_inc_count(old_inode);
 800                 err = ll_add_link(new_dentry, old_inode);
 801                 if (err) {
 802                         ext2_dec_count(old_inode);
 803                         goto out_dir;
 804                 }
 805                 if (dir_de)
 806                         ext2_inc_count(new_dir);
 807         }
 808
 809         ext2_delete_entry (old_de, old_page);
 810         ext2_dec_count(old_inode);
 811
 812         if (dir_de) {
 813                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 814                 ext2_dec_count(old_dir);
 815         }
 816         return 0;
 817
 818 out_dir:
 819         if (dir_de) {
 820                 kunmap(dir_page);
 821                 page_cache_release(dir_page);
 822         }
 823 out_old:
 824         kunmap(old_page);
 825         page_cache_release(old_page);
 826 out:
 827         return err;
 828 }
 829
 830 struct inode_operations ll_dir_inode_operations = {
 831         create:         ll_create,
 832         lookup2:        ll_lookup2,
 833         link:           ll_link,
 834         unlink:         ll_unlink,
 835         symlink:        ll_symlink,
 836         mkdir:          ll_mkdir,
 837         rmdir:          ll_rmdir,
 838         mknod:          ll_mknod,
 839         rename:         ll_rename,
 840         setattr:        ll_setattr
 841 };