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                         mds_md_size = ll_mds_easize(dir->i_sb);
 345                         OBD_ALLOC(lmm, mds_md_size);
 346                         lov_packmd(lmm, lsm);
 347                         lic.lic_lmm = lmm;
 348                 } else
 349                         lic.lic_lmm = NULL;
 350
 351         } else {
 352                 invalidate_inode_pages(dir);
 353                 request = it->it_data;
 354                 body = lustre_msg_buf(request->rq_repmsg, 1);
 355                 lic.lic_lmm = NULL;
 356         }
 357
 358         body->valid = OBD_MD_FLNOTOBD;
 359
 360         body->nlink = 1;
 361         body->atime = body->ctime = body->mtime = time;
 362         body->uid = current->fsuid;
 363         body->gid = gid;
 364         body->mode = mode;
 365
 366         lic.lic_body = body;
 367
 368         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 369         if (IS_ERR(inode)) {
 370                 rc = PTR_ERR(inode);
 371                 CERROR("new_inode -fatal: rc %d\n", rc);
 372                 LBUG();
 373                 GOTO(out, rc);
 374         }
 375
 376         if (!list_empty(&inode->i_dentry)) {
 377                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 378                        body->ino, atomic_read(&inode->i_count),
 379                        inode->i_nlink);
 380                 iput(inode);
 381                 LBUG();
 382                 inode = ERR_PTR(-EIO);
 383                 GOTO(out, -EIO);
 384         }
 385
 386         EXIT;
 387  out:
 388         if (lmm)
 389                 OBD_FREE(lmm, mds_md_size);
 390         ptlrpc_req_finished(request);
 391         return inode;
 392 }
 393
 394 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 395                          const char *name, int len)
 396 {
 397         struct ptlrpc_request *request = NULL;
 398         struct ll_sb_info *sbi = ll_i2sbi(dir);
 399         int err;
 400
 401         ENTRY;
 402
 403         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 404                          &request);
 405         ptlrpc_req_finished(request);
 406
 407         RETURN(err);
 408 }
 409
 410 int ll_mdc_link(struct dentry *src, struct inode *dir,
 411                 const char *name, int len)
 412 {
 413         struct ptlrpc_request *request = NULL;
 414         int err;
 415         struct ll_sb_info *sbi = ll_i2sbi(dir);
 416
 417         ENTRY;
 418
 419         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
 420                        len, &request);
 421         ptlrpc_req_finished(request);
 422
 423         RETURN(err);
 424 }
 425
 426 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 427                   struct dentry *old, struct dentry *new)
 428 {
 429         struct ptlrpc_request *request = NULL;
 430         struct ll_sb_info *sbi = ll_i2sbi(src);
 431         int err;
 432
 433         ENTRY;
 434
 435         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 436                          old->d_name.name, old->d_name.len,
 437                          new->d_name.name, new->d_name.len, &request);
 438         ptlrpc_req_finished(request);
 439
 440         RETURN(err);
 441 }
 442
 443 /*
 444  * By the time this is called, we already have created
 445  * the directory cache entry for the new file, but it
 446  * is so far negative - it has no inode.
 447  *
 448  * If the create succeeds, we fill in the inode information
 449  * with d_instantiate().
 450  */
 451
 452 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
 453 {
 454         int err, rc = 0;
 455         struct obdo *oa = NULL;
 456         struct inode *inode;
 457         struct lov_stripe_md *lsm = NULL;
 458         struct ll_inode_info *lli = NULL;
 459         ENTRY;
 460
 461         CHECK_MOUNT_EPOCH(dir);
 462
 463         if (dentry->d_it->it_disposition == 0) {
 464                 int gid = current->fsgid;
 465
 466                 if (dir->i_mode & S_ISGID)
 467                         gid = dir->i_gid;
 468
 469                 oa = obdo_alloc();
 470                 if (!oa)
 471                         RETURN(-ENOMEM);
 472
 473                 oa->o_mode = S_IFREG | 0600;
 474                 /* FIXME: we set the UID/GID fields to 0 for now, because it
 475                  *        fixes a bug on the BA OSTs.  We should really set
 476                  *        them properly, and this needs to be revisited when
 477                  *        we do proper credentials checking on the OST, and
 478                  *        set the attributes on the OST in ll_inode_setattr().
 479                 oa->o_uid = current->fsuid;
 480                 oa->o_gid = gid;
 481                  */
 482                 oa->o_uid = 0;
 483                 oa->o_gid = 0;
 484                 oa->o_valid = OBD_MD_FLTYPE | OBD_MD_FLMODE | OBD_MD_FLUID |
 485                         OBD_MD_FLGID;
 486                 rc = obd_create(ll_i2obdconn(dir), oa, &lsm);
 487                 CDEBUG(D_DENTRY, "name %s mode %o o_id "LPX64": rc = %d\n",
 488                        dentry->d_name.name, mode, oa->o_id, rc);
 489                 if (rc)
 490                         GOTO(out_free, rc);
 491         }
 492
 493         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 494                                NULL, 0, mode, 0, dentry->d_it, lsm);
 495
 496         if (IS_ERR(inode)) {
 497                 rc = PTR_ERR(inode);
 498                 CERROR("error creating MDS object for id "LPX64": rc = %d\n",
 499                        oa->o_id, rc);
 500                 GOTO(out_destroy, rc);
 501         }
 502
 503         if (dentry->d_it->it_disposition) {
 504                 lli = ll_i2info(inode);
 505                 memcpy(&lli->lli_intent_lock_handle,
 506                        dentry->d_it->it_lock_handle,
 507                        sizeof(struct lustre_handle));
 508                 d_instantiate(dentry, inode);
 509         } else {
 510                 /* no directory data updates when intents rule */
 511                 rc = ext2_add_nondir(dentry, inode);
 512         }
 513
 514 out_free:
 515         obdo_free(oa);
 516         RETURN(rc);
 517
 518 out_destroy:
 519         if (lsm) {
 520                 if (!oa)
 521                         oa = obdo_alloc();
 522                 if (!oa)
 523                         RETURN(-ENOMEM);
 524
 525                 oa->o_easize = ll_mds_easize(inode->i_sb);
 526                 oa->o_valid |= OBD_MD_FLEASIZE;
 527                 err = obd_destroy(ll_i2obdconn(dir), oa, lsm);
 528                 if (err)
 529                         CERROR("error uncreating objid "LPX64": err %d\n",
 530                                oa->o_id, err);
 531         }
 532
 533         goto out_free;
 534 }
 535
 536 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 537                     int rdev)
 538 {
 539         struct inode *inode;
 540         int err = 0;
 541
 542         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 543                                NULL, 0, mode, rdev, dentry->d_it, NULL);
 544
 545         if (IS_ERR(inode))
 546                 RETURN(PTR_ERR(inode));
 547
 548         /* no directory data updates when intents rule */
 549         if (dentry->d_it && dentry->d_it->it_disposition)
 550                 d_instantiate(dentry, inode);
 551         else
 552                 err = ext2_add_nondir(dentry, inode);
 553
 554         return err;
 555 }
 556
 557 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 558                       const char *symname)
 559 {
 560         unsigned l = strlen(symname);
 561         struct inode *inode;
 562         struct ll_inode_info *lli;
 563         int err = 0;
 564         ENTRY;
 565
 566         CHECK_MOUNT_EPOCH(dir);
 567
 568         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 569                                symname, l, S_IFLNK | S_IRWXUGO, 0,
 570                                dentry->d_it, NULL);
 571         if (IS_ERR(inode))
 572                 RETURN(PTR_ERR(inode));
 573
 574         lli = ll_i2info(inode);
 575
 576         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 577         /* this _could_ be a non-fatal error, since the symlink is already
 578          * stored on the MDS by this point, and we can re-get it in readlink.
 579          */
 580         if (!lli->lli_symlink_name)
 581                 RETURN(-ENOMEM);
 582
 583         memcpy(lli->lli_symlink_name, symname, l + 1);
 584         inode->i_size = l;
 585
 586         /* no directory data updates when intents rule */
 587         if (dentry->d_it && dentry->d_it->it_disposition)
 588                 d_instantiate(dentry, inode);
 589         else
 590                 err = ext2_add_nondir(dentry, inode);
 591
 592         RETURN(err);
 593 }
 594
 595 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 596                    struct dentry *dentry)
 597 {
 598         int err;
 599         struct inode *inode = old_dentry->d_inode;
 600
 601         if (dentry->d_it && dentry->d_it->it_disposition) {
 602                 int err = dentry->d_it->it_status;
 603                 if (err)
 604                         RETURN(err);
 605                 inode->i_ctime = CURRENT_TIME;
 606                 ext2_inc_count(inode);
 607                 atomic_inc(&inode->i_count);
 608                 d_instantiate(dentry, inode);
 609                 invalidate_inode_pages(dir);
 610                 RETURN(err);
 611         }
 612
 613         if (S_ISDIR(inode->i_mode))
 614                 return -EPERM;
 615
 616         if (inode->i_nlink >= EXT2_LINK_MAX)
 617                 return -EMLINK;
 618
 619         err = ll_mdc_link(old_dentry, dir,
 620                           dentry->d_name.name, dentry->d_name.len);
 621         if (err)
 622                 RETURN(err);
 623
 624         inode->i_ctime = CURRENT_TIME;
 625         ext2_inc_count(inode);
 626         atomic_inc(&inode->i_count);
 627
 628         return ext2_add_nondir(dentry, inode);
 629 }
 630
 631 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 632 {
 633         struct inode * inode;
 634         int err = -EMLINK;
 635         ENTRY;
 636
 637         if (dir->i_nlink >= EXT2_LINK_MAX)
 638                 goto out;
 639
 640         ext2_inc_count(dir);
 641
 642         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 643                                NULL, 0, S_IFDIR | mode, 0, dentry->d_it, NULL);
 644         err = PTR_ERR(inode);
 645         if (IS_ERR(inode))
 646                 goto out_dir;
 647
 648         ext2_inc_count(inode);
 649
 650         err = ext2_make_empty(inode, dir);
 651         if (err)
 652                 goto out_fail;
 653
 654         /* no directory data updates when intents rule */
 655         if (dentry->d_it->it_disposition == 0) {
 656                 err = ll_add_link(dentry, inode);
 657                 if (err)
 658                         goto out_fail;
 659         }
 660
 661         d_instantiate(dentry, inode);
 662 out:
 663         EXIT;
 664         return err;
 665
 666 out_fail:
 667         ext2_dec_count(inode);
 668         ext2_dec_count(inode);
 669         iput(inode);
 670         EXIT;
 671 out_dir:
 672         ext2_dec_count(dir);
 673         EXIT;
 674         goto out;
 675 }
 676
 677 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 678                             __u32 mode)
 679 {
 680         struct inode * inode = dentry->d_inode;
 681 #if 0
 682         struct ext2_dir_entry_2 * de;
 683         struct page * page;
 684 #endif
 685         int err = -ENOENT;
 686
 687         if (dentry->d_it && dentry->d_it->it_disposition) {
 688                 err = dentry->d_it->it_status;
 689                 invalidate_inode_pages(dir);
 690                 GOTO(out, err);
 691         }
 692
 693 #if 0
 694         de = ext2_find_entry(dir, dentry, &page);
 695         if (!de)
 696                 goto out;
 697 #endif
 698         err = ll_mdc_unlink(dir, dentry->d_inode, mode,
 699                             dentry->d_name.name, dentry->d_name.len);
 700         if (err)
 701                 goto out;
 702
 703 #if 0
 704         err = ext2_delete_entry(de, page);
 705         if (err)
 706                 goto out;
 707 #endif
 708         invalidate_inode_pages(dir);
 709
 710         inode->i_ctime = dir->i_ctime;
 711 out:
 712         ext2_dec_count(inode);
 713         return err;
 714 }
 715
 716 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 717 {
 718         return ll_common_unlink(dir, dentry, S_IFREG);
 719 }
 720
 721 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 722 {
 723         struct inode * inode = dentry->d_inode;
 724         int err = 0;
 725         ENTRY;
 726
 727         if (!dentry->d_it || dentry->d_it->it_disposition == 0) {
 728                 if (!ext2_empty_dir(inode))
 729                         RETURN(-ENOTEMPTY);
 730                 err = ll_common_unlink(dir, dentry, S_IFDIR);
 731         } else
 732                 err = dentry->d_it->it_status;
 733         if (err)
 734                 RETURN(err);
 735         inode->i_size = 0;
 736         ext2_dec_count(inode);
 737         ext2_dec_count(dir);
 738         RETURN(err);
 739 }
 740
 741 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 742                      struct inode * new_dir, struct dentry * new_dentry)
 743 {
 744         struct inode * old_inode = old_dentry->d_inode;
 745         struct inode * tgt_inode = new_dentry->d_inode;
 746         struct page * dir_page = NULL;
 747         struct ext2_dir_entry_2 * dir_de = NULL;
 748         struct ext2_dir_entry_2 * old_de;
 749         struct page * old_page;
 750         int err = -ENOENT;
 751
 752         if (new_dentry->d_it && new_dentry->d_it->it_disposition) {
 753                 if (tgt_inode) {
 754                         tgt_inode->i_ctime = CURRENT_TIME;
 755                         tgt_inode->i_nlink--;
 756                 }
 757                 invalidate_inode_pages(old_dir);
 758                 invalidate_inode_pages(new_dir);
 759                 GOTO(out, err = new_dentry->d_it->it_status);
 760         }
 761
 762         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 763         if (err)
 764                 goto out;
 765
 766         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 767         if (!old_de)
 768                 goto out;
 769
 770         if (S_ISDIR(old_inode->i_mode)) {
 771                 err = -EIO;
 772                 dir_de = ext2_dotdot(old_inode, &dir_page);
 773                 if (!dir_de)
 774                         goto out_old;
 775         }
 776
 777         if (tgt_inode) {
 778                 struct page *new_page;
 779                 struct ext2_dir_entry_2 *new_de;
 780
 781                 err = -ENOTEMPTY;
 782                 if (dir_de && !ext2_empty_dir (tgt_inode))
 783                         goto out_dir;
 784
 785                 err = -ENOENT;
 786                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 787                 if (!new_de)
 788                         goto out_dir;
 789                 ext2_inc_count(old_inode);
 790                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 791                 tgt_inode->i_ctime = CURRENT_TIME;
 792                 if (dir_de)
 793                         tgt_inode->i_nlink--;
 794                 ext2_dec_count(tgt_inode);
 795         } else {
 796                 if (dir_de) {
 797                         err = -EMLINK;
 798                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 799                                 goto out_dir;
 800                 }
 801                 ext2_inc_count(old_inode);
 802                 err = ll_add_link(new_dentry, old_inode);
 803                 if (err) {
 804                         ext2_dec_count(old_inode);
 805                         goto out_dir;
 806                 }
 807                 if (dir_de)
 808                         ext2_inc_count(new_dir);
 809         }
 810
 811         ext2_delete_entry (old_de, old_page);
 812         ext2_dec_count(old_inode);
 813
 814         if (dir_de) {
 815                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 816                 ext2_dec_count(old_dir);
 817         }
 818         return 0;
 819
 820 out_dir:
 821         if (dir_de) {
 822                 kunmap(dir_page);
 823                 page_cache_release(dir_page);
 824         }
 825 out_old:
 826         kunmap(old_page);
 827         page_cache_release(old_page);
 828 out:
 829         return err;
 830 }
 831
 832 struct inode_operations ll_dir_inode_operations = {
 833         create:         ll_create,
 834         lookup2:        ll_lookup2,
 835         link:           ll_link,
 836         unlink:         ll_unlink,
 837         symlink:        ll_symlink,
 838         mkdir:          ll_mkdir,
 839         rmdir:          ll_rmdir,
 840         mknod:          ll_mknod,
 841         rename:         ll_rename,
 842         setattr:        ll_setattr
 843 };