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/sched.h>
  32 #include <linux/mm.h>
  33 #include <linux/smp_lock.h>
  34 #include <linux/quotaops.h>
  35 #include <linux/highmem.h>
  36 #include <linux/pagemap.h>
  37
  38 #define DEBUG_SUBSYSTEM S_LLITE
  39
  40 #include <linux/obd_support.h>
  41 #include <linux/lustre_lite.h>
  42 #include <linux/lustre_dlm.h>
  43 #include <linux/obd_lov.h>
  44
  45 extern struct address_space_operations ll_aops;
  46
  47 /* from super.c */
  48 extern void ll_change_inode(struct inode *inode);
  49 extern int ll_setattr(struct dentry *de, struct iattr *attr);
  50
  51 /* from dir.c */
  52 extern int ll_add_link (struct dentry *dentry, struct inode *inode);
  53 obd_id ll_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
  54 int ext2_make_empty(struct inode *inode, struct inode *parent);
  55 struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
  56                    struct dentry *dentry, struct page ** res_page);
  57 int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
  58 int ext2_empty_dir (struct inode * inode);
  59 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
  60 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
  61                    struct page *page, struct inode *inode);
  62
  63 /*
  64  * Couple of helper functions - make the code slightly cleaner.
  65  */
  66 static inline void ext2_inc_count(struct inode *inode)
  67 {
  68         inode->i_nlink++;
  69 }
  70
  71 /* postpone the disk update until the inode really goes away */
  72 static inline void ext2_dec_count(struct inode *inode)
  73 {
  74         inode->i_nlink--;
  75 }
  76
  77 static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
  78 {
  79         int err;
  80         err = ll_add_link(dentry, inode);
  81         if (!err) {
  82                 d_instantiate(dentry, inode);
  83                 return 0;
  84         }
  85         ext2_dec_count(inode);
  86         iput(inode);
  87         return err;
  88 }
  89
  90 /* methods */
  91
  92 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  93 static int ll_find_inode(struct inode *inode, unsigned long ino, void *opaque)
  94 #else
  95 static int ll_test_inode(struct inode *inode, void *opaque)
  96 #endif
  97 {
  98         struct ll_read_inode2_cookie *lic = opaque;
  99         struct mds_body *body = lic->lic_body;
 100
 101         if (inode->i_generation != lic->lic_body->generation)
 102                 return 0;
 103
 104         /* Apply the attributes in 'opaque' to this inode */
 105         ll_update_inode(inode, body);
 106
 107         return 1;
 108 }
 109
 110 extern struct dentry_operations ll_d_ops;
 111
 112 int ll_lock(struct inode *dir, struct dentry *dentry,
 113             struct lookup_intent *it, struct lustre_handle *lockh)
 114 {
 115         struct ll_sb_info *sbi = ll_i2sbi(dir);
 116         char *tgt = NULL;
 117         int tgtlen = 0;
 118         int err, lock_mode;
 119
 120         /* CREAT needs to be tested before open (both could be set) */
 121         if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SETATTR | IT_MKNOD))) {
 122                 lock_mode = LCK_PW;
 123         } else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
 124                                 IT_RMDIR | IT_RENAME | IT_RENAME2 | IT_READLINK|
 125                                 IT_LINK | IT_LINK2 | IT_LOOKUP)) {
 126                 /* XXXphil PW for LINK2/RENAME2? */
 127                 lock_mode = LCK_PR;
 128         } else if (it->it_op & IT_SYMLINK) {
 129                 lock_mode = LCK_PW;
 130                 tgt = it->it_data;
 131                 tgtlen = strlen(tgt);
 132                 it->it_data = NULL;
 133         } else {
 134                 LBUG();
 135                 RETURN(-EINVAL);
 136         }
 137
 138         err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT, it, lock_mode,
 139                           dir, dentry, lockh, tgt, tgtlen, dir, sizeof(*dir));
 140
 141         RETURN(err);
 142 }
 143
 144 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
 145 {
 146         ENTRY;
 147
 148         ldlm_lock_decref(lockh, mode);
 149
 150         RETURN(0);
 151 }
 152
 153 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
 154 extern int ll_read_inode2(struct inode *inode, void *opaque);
 155 struct inode *ll_iget(struct super_block *sb, ino_t hash,
 156                       struct ll_read_inode2_cookie *lic)
 157 {
 158         struct inode *inode;
 159
 160         inode = iget5_locked(sb, hash, ll_test_inode, ll_read_inode2, lic);
 161
 162         if (!inode)
 163                 return ERR_PTR(-ENOMEM);
 164
 165         if (inode->i_state & I_NEW) {
 166
 167                 unlock_new_inode(inode);
 168         }
 169
 170         // XXX Coda always fills inodes, should Lustre?
 171         return inode;
 172 }
 173 #else
 174 struct inode *ll_iget(struct super_block *sb, ino_t hash,
 175                       struct ll_read_inode2_cookie *lic)
 176 {
 177         struct inode *inode;
 178         inode = iget4(sb, hash, ll_find_inode, lic);
 179         return inode;
 180 }
 181 #endif
 182
 183 static struct dentry *ll_lookup2(struct inode *dir, struct dentry *dentry,
 184                                  struct lookup_intent *it)
 185 {
 186         struct ptlrpc_request *request = NULL;
 187         struct inode * inode = NULL;
 188         struct ll_sb_info *sbi = ll_i2sbi(dir);
 189         struct ll_read_inode2_cookie lic;
 190         struct lustre_handle lockh;
 191         struct lookup_intent lookup_it = { IT_LOOKUP };
 192         int rc, offset;
 193         obd_id ino = 0;
 194
 195         ENTRY;
 196
 197         if (it == NULL)
 198                 it = &lookup_it;
 199
 200         CDEBUG(D_INFO, "name: %*s, intent: %s\n", dentry->d_name.len,
 201                dentry->d_name.name, ldlm_it2str(it->it_op));
 202
 203         if (dentry->d_name.len > EXT2_NAME_LEN)
 204                 RETURN(ERR_PTR(-ENAMETOOLONG));
 205
 206         rc = ll_lock(dir, dentry, it, &lockh);
 207         if (rc < 0)
 208                 RETURN(ERR_PTR(rc));
 209         memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
 210
 211         request = (struct ptlrpc_request *)it->it_data;
 212         if (it->it_disposition) {
 213                 int mode, symlen = 0;
 214                 obd_flag valid;
 215
 216                 offset = 1;
 217                 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 218                 ino = lic.lic_body->fid1.id;
 219                 mode = lic.lic_body->mode;
 220                 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
 221                         /* For create ops, we want the lookup to be negative,
 222                          * unless the create failed in a way that indicates
 223                          * that the file is already there */
 224                         if (it->it_status != -EEXIST)
 225                                 GOTO(negative, NULL);
 226                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP |
 227                                         IT_READLINK)) {
 228                         /* For check ops, we want the lookup to succeed */
 229                         it->it_data = NULL;
 230                         if (it->it_status)
 231                                 GOTO(neg_req, NULL);
 232                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 233                         /* For rename, we want the source lookup to succeed */
 234                         if (it->it_status) {
 235                                 it->it_data = NULL;
 236                                 GOTO(drop_req, rc = it->it_status);
 237                         }
 238                         it->it_data = dentry;
 239                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 240                         /* For remove ops, we want the lookup to succeed unless
 241                          * the file truly doesn't exist */
 242                         it->it_data = NULL;
 243                         if (it->it_status == -ENOENT)
 244                                 GOTO(neg_req, NULL);
 245                         goto iget;
 246                 } else if (it->it_op == IT_OPEN) {
 247                         it->it_data = NULL;
 248                         if (it->it_status && it->it_status != -EEXIST)
 249                                 GOTO(neg_req, NULL);
 250                 } else if (it->it_op & (IT_RENAME2 | IT_LINK2)) {
 251                         struct mds_body *body =
 252                                 lustre_msg_buf(request->rq_repmsg, offset);
 253                         it->it_data = NULL;
 254                         /* This means the target lookup is negative */
 255                         if (body->valid == 0)
 256                                 GOTO(neg_req, NULL);
 257                         goto iget;
 258                 }
 259
 260                 /* Do a getattr now that we have the lock */
 261                 valid = OBD_MD_FLNOTOBD | OBD_MD_FLEASIZE;
 262                 if (it->it_op == IT_READLINK) {
 263                         valid |= OBD_MD_LINKNAME;
 264                         symlen = lic.lic_body->size;
 265                 }
 266                 ptlrpc_req_finished(request);
 267                 request = NULL;
 268                 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 269                                  valid, symlen, &request);
 270                 if (rc) {
 271                         CERROR("failure %d inode "LPX64"\n", rc, ino);
 272                         GOTO(drop_req, rc = -abs(rc));
 273                 }
 274                 offset = 0;
 275         } else {
 276                 struct ll_inode_info *lli = ll_i2info(dir);
 277                 int mode;
 278
 279                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 280                 offset = 0;
 281
 282                 ino = ll_inode_by_name(dir, dentry, &mode);
 283                 if (!ino) {
 284                         CERROR("inode %*s not found by name\n",
 285                                dentry->d_name.len, dentry->d_name.name);
 286                         GOTO(drop_lock, rc = -ENOENT);
 287                 }
 288
 289                 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 290                                  OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 291                 if (rc) {
 292                         CERROR("failure %d inode "LPX64"\n", rc, ino);
 293                         GOTO(drop_req, rc = -abs(rc));
 294                 }
 295         }
 296
 297  iget:
 298         lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 299         if (S_ISREG(lic.lic_body->mode) &&
 300             lic.lic_body->valid & OBD_MD_FLEASIZE) {
 301                 LASSERT(request->rq_repmsg->bufcount > offset);
 302                 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
 303         } else
 304                 lic.lic_lmm = NULL;
 305
 306         /* No rpc's happen during iget4, -ENOMEM's are possible */
 307         LASSERT(ino != 0);
 308         inode = ll_iget(dir->i_sb, ino, &lic);
 309         if (!inode) {
 310                 ptlrpc_free_req(request);
 311                 ll_intent_release(dentry, it);
 312                 RETURN(ERR_PTR(-ENOMEM));
 313         }
 314
 315         EXIT;
 316  neg_req:
 317         ptlrpc_req_finished(request);
 318  negative:
 319         dentry->d_op = &ll_d_ops;
 320         if (ll_d2d(dentry) == NULL) {
 321                 ll_set_dd(dentry);
 322         } else
 323                 CERROR("NOT allocating fsdata - already set\n");
 324
 325         d_add(dentry, inode);
 326
 327         if (it->it_status == 0) {
 328                 LL_SAVE_INTENT(dentry, it);
 329         } else {
 330                 dentry->d_it = NULL;
 331                 CDEBUG(D_DENTRY,
 332                        "D_IT dentry %p fsdata %p intent: %s status %d\n",
 333                        dentry, ll_d2d(dentry), ldlm_it2str(it->it_op),
 334                        it->it_status);
 335         }
 336
 337         if (it->it_op == IT_LOOKUP)
 338                 ll_intent_release(dentry, it);
 339
 340         return NULL;
 341
 342  drop_req:
 343         ptlrpc_free_req(request);
 344  drop_lock:
 345 #warning FIXME: must release lock here
 346         return ERR_PTR(rc);
 347 }
 348
 349 static struct inode *ll_create_node(struct inode *dir, const char *name,
 350                                     int namelen, const char *tgt, int tgtlen,
 351                                     int mode, __u64 extra,
 352                                     struct lookup_intent *it,
 353                                     struct lov_stripe_md *lsm)
 354 {
 355         struct inode *inode;
 356         struct ptlrpc_request *request = NULL;
 357         struct mds_body *body;
 358         time_t time = CURRENT_TIME;
 359         struct ll_sb_info *sbi = ll_i2sbi(dir);
 360         struct ll_read_inode2_cookie lic;
 361         struct lov_mds_md *lmm = NULL;
 362         ENTRY;
 363
 364         if (it && it->it_disposition) {
 365                 int rc = it->it_status;
 366                 if (rc) {
 367                         CERROR("error creating MDS inode for %*s: rc = %d\n",
 368                                namelen, name, rc);
 369                         RETURN(ERR_PTR(rc));
 370                 }
 371                 ll_invalidate_inode_pages(dir);
 372                 request = it->it_data;
 373                 body = lustre_msg_buf(request->rq_repmsg, 1);
 374                 lic.lic_lmm = NULL;
 375         } else {
 376                 int gid = current->fsgid;
 377                 int rc;
 378
 379                 if (lsm) {
 380                         OBD_ALLOC(lmm, lsm->lsm_mds_easize);
 381                         if (!lmm)
 382                                 RETURN(ERR_PTR(-ENOMEM));
 383                         lov_packmd(lmm, lsm);
 384                         lic.lic_lmm = lmm;
 385                 } else
 386                         lic.lic_lmm = NULL;
 387
 388                 if (dir->i_mode & S_ISGID) {
 389                         gid = dir->i_gid;
 390                         if (S_ISDIR(mode))
 391                                 mode |= S_ISGID;
 392                 }
 393
 394                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 395                                 tgtlen, mode, current->fsuid, gid,
 396                                 time, extra, lsm, &request);
 397                 if (rc) {
 398                         inode = ERR_PTR(rc);
 399                         GOTO(out, rc);
 400                 }
 401                 body = lustre_msg_buf(request->rq_repmsg, 0);
 402         }
 403
 404         lic.lic_body = body;
 405
 406         LASSERT(body->ino != 0);
 407         inode = ll_iget(dir->i_sb, body->ino, &lic);
 408         if (IS_ERR(inode)) {
 409                 int rc = PTR_ERR(inode);
 410                 CERROR("new_inode -fatal: rc %d\n", rc);
 411                 LBUG();
 412                 GOTO(out, rc);
 413         }
 414
 415         if (!list_empty(&inode->i_dentry)) {
 416                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 417                        body->ino, atomic_read(&inode->i_count),
 418                        inode->i_nlink);
 419                 iput(inode);
 420                 LBUG();
 421                 inode = ERR_PTR(-EIO);
 422                 GOTO(out, -EIO);
 423         }
 424
 425         EXIT;
 426  out:
 427         if (lsm && lmm)
 428                 OBD_FREE(lmm, lsm->lsm_mds_easize);
 429         ptlrpc_req_finished(request);
 430         return inode;
 431 }
 432
 433 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 434                          const char *name, int len)
 435 {
 436         struct ptlrpc_request *request = NULL;
 437         struct ll_sb_info *sbi = ll_i2sbi(dir);
 438         int err;
 439
 440         ENTRY;
 441
 442         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 443                          &request);
 444         ptlrpc_req_finished(request);
 445
 446         RETURN(err);
 447 }
 448
 449 int ll_mdc_link(struct dentry *src, struct inode *dir,
 450                 const char *name, int len)
 451 {
 452         struct ptlrpc_request *request = NULL;
 453         int err;
 454         struct ll_sb_info *sbi = ll_i2sbi(dir);
 455
 456         ENTRY;
 457
 458         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name, len, &request);
 459         ptlrpc_req_finished(request);
 460
 461         RETURN(err);
 462 }
 463
 464 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 465                   struct dentry *old, struct dentry *new)
 466 {
 467         struct ptlrpc_request *request = NULL;
 468         struct ll_sb_info *sbi = ll_i2sbi(src);
 469         int err;
 470
 471         ENTRY;
 472
 473         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 474                          old->d_name.name, old->d_name.len,
 475                          new->d_name.name, new->d_name.len, &request);
 476         ptlrpc_req_finished(request);
 477
 478         RETURN(err);
 479 }
 480
 481 /*
 482  * By the time this is called, we already have created the directory cache
 483  * entry for the new file, but it is so far negative - it has no inode.
 484  * We defer creating the OBD object(s) until open, to keep the intent and
 485  * non-intent code paths similar, and also because we do not have the MDS
 486  * inode number before calling ll_create_node() (which is needed for LOV),
 487  * so we would need to do yet another RPC to the MDS to store the LOV EA
 488  * data on the MDS.
 489  *
 490  * If the create succeeds, we fill in the inode information
 491  * with d_instantiate().
 492  */
 493 static int ll_create(struct inode *dir, struct dentry *dentry, int mode)
 494 {
 495         struct lookup_intent *it;
 496         struct inode *inode;
 497         int rc = 0;
 498         ENTRY;
 499
 500         LL_GET_INTENT(dentry, it);
 501
 502         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 503                                NULL, 0, mode, 0, it, NULL);
 504
 505         if (IS_ERR(inode))
 506                 RETURN(PTR_ERR(inode));
 507
 508         if (it->it_disposition) {
 509                 struct ll_inode_info *lli = ll_i2info(inode);
 510                 memcpy(&lli->lli_intent_lock_handle, it->it_lock_handle,
 511                        sizeof(lli->lli_intent_lock_handle));
 512                 d_instantiate(dentry, inode);
 513         } else {
 514                 /* no directory data updates when intents rule */
 515                 rc = ext2_add_nondir(dentry, inode);
 516         }
 517
 518         RETURN(rc);
 519 }
 520
 521 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 522                     int rdev)
 523 {
 524         struct lookup_intent *it;
 525         struct inode *inode;
 526         int rc = 0;
 527
 528         LL_GET_INTENT(dentry, it);
 529
 530         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 531                                NULL, 0, mode, rdev, it, NULL);
 532
 533         if (IS_ERR(inode))
 534                 RETURN(PTR_ERR(inode));
 535
 536         /* no directory data updates when intents rule */
 537         if (it && it->it_disposition)
 538                 d_instantiate(dentry, inode);
 539         else
 540                 rc = ext2_add_nondir(dentry, inode);
 541
 542         return rc;
 543 }
 544
 545 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 546                       const char *symname)
 547 {
 548         struct lookup_intent *it;
 549         unsigned l = strlen(symname);
 550         struct inode *inode;
 551         struct ll_inode_info *lli;
 552         int err = 0;
 553         ENTRY;
 554
 555         LL_GET_INTENT(dentry, it);
 556
 557         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 558                                symname, l, S_IFLNK | S_IRWXUGO, 0, it, NULL);
 559         if (IS_ERR(inode))
 560                 RETURN(PTR_ERR(inode));
 561
 562         lli = ll_i2info(inode);
 563
 564         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 565         /* this _could_ be a non-fatal error, since the symlink is already
 566          * stored on the MDS by this point, and we can re-get it in readlink.
 567          */
 568         if (!lli->lli_symlink_name)
 569                 RETURN(-ENOMEM);
 570
 571         memcpy(lli->lli_symlink_name, symname, l + 1);
 572         inode->i_size = l;
 573
 574         /* no directory data updates when intents rule */
 575         if (it && it->it_disposition)
 576                 d_instantiate(dentry, inode);
 577         else
 578                 err = ext2_add_nondir(dentry, inode);
 579
 580         RETURN(err);
 581 }
 582
 583 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 584                    struct dentry *dentry)
 585 {
 586         struct lookup_intent *it;
 587         struct inode *inode = old_dentry->d_inode;
 588         int rc;
 589
 590         LL_GET_INTENT(dentry, it);
 591
 592         if (it && it->it_disposition) {
 593                 if (it->it_status)
 594                         RETURN(it->it_status);
 595                 inode->i_ctime = CURRENT_TIME;
 596                 ext2_inc_count(inode);
 597                 atomic_inc(&inode->i_count);
 598                 d_instantiate(dentry, inode);
 599                 ll_invalidate_inode_pages(dir);
 600                 RETURN(0);
 601         }
 602
 603         if (S_ISDIR(inode->i_mode))
 604                 return -EPERM;
 605
 606         if (inode->i_nlink >= EXT2_LINK_MAX)
 607                 return -EMLINK;
 608
 609         rc = ll_mdc_link(old_dentry, dir,
 610                           dentry->d_name.name, dentry->d_name.len);
 611         if (rc)
 612                 RETURN(rc);
 613
 614         inode->i_ctime = CURRENT_TIME;
 615         ext2_inc_count(inode);
 616         atomic_inc(&inode->i_count);
 617
 618         return ext2_add_nondir(dentry, inode);
 619 }
 620
 621 static int ll_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 622 {
 623         struct lookup_intent *it;
 624         struct inode * inode;
 625         int err = -EMLINK;
 626         ENTRY;
 627
 628         LL_GET_INTENT(dentry, it);
 629
 630         if (dir->i_nlink >= EXT2_LINK_MAX)
 631                 goto out;
 632
 633         ext2_inc_count(dir);
 634         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 635                                NULL, 0, S_IFDIR | mode, 0, it, NULL);
 636         err = PTR_ERR(inode);
 637         if (IS_ERR(inode))
 638                 goto out_dir;
 639
 640         ext2_inc_count(inode);
 641
 642         err = ext2_make_empty(inode, dir);
 643         if (err)
 644                 goto out_fail;
 645
 646         /* no directory data updates when intents rule */
 647         if (!it || !it->it_disposition) {
 648                 err = ll_add_link(dentry, inode);
 649                 if (err)
 650                         goto out_fail;
 651         }
 652
 653         d_instantiate(dentry, inode);
 654 out:
 655         EXIT;
 656         return err;
 657
 658 out_fail:
 659         ext2_dec_count(inode);
 660         ext2_dec_count(inode);
 661         iput(inode);
 662         EXIT;
 663 out_dir:
 664         ext2_dec_count(dir);
 665         EXIT;
 666         goto out;
 667 }
 668
 669 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 670                             struct lookup_intent *it, __u32 mode)
 671 {
 672         struct inode *inode = dentry->d_inode;
 673         struct ext2_dir_entry_2 * de;
 674         struct page * page;
 675         int rc = 0;
 676
 677         if (it && it->it_disposition) {
 678                 rc = it->it_status;
 679                 ll_invalidate_inode_pages(dir);
 680                 if (rc)
 681                         GOTO(out, rc);
 682                 GOTO(out_dec, 0);
 683         }
 684
 685         de = ext2_find_entry(dir, dentry, &page);
 686         if (!de)
 687                 GOTO(out, rc = -ENOENT);
 688         rc = ll_mdc_unlink(dir, dentry->d_inode, mode,
 689                            dentry->d_name.name, dentry->d_name.len);
 690         if (rc)
 691                 GOTO(out, rc);
 692
 693         rc = ext2_delete_entry(de, page);
 694         if (rc)
 695                 GOTO(out, rc);
 696
 697         /* AED: not sure if needed - directory lock revocation should do it
 698          * in the case where the client has cached it for non-intent ops.
 699          */
 700         ll_invalidate_inode_pages(dir);
 701
 702         inode->i_ctime = dir->i_ctime;
 703 out_dec:
 704         ext2_dec_count(inode);
 705 out:
 706         return rc;
 707 }
 708
 709 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 710 {
 711         struct lookup_intent * it;
 712
 713         LL_GET_INTENT(dentry, it);
 714
 715         return ll_common_unlink(dir, dentry, it, S_IFREG);
 716 }
 717
 718 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 719 {
 720         struct inode * inode = dentry->d_inode;
 721         struct lookup_intent *it;
 722         int rc;
 723         ENTRY;
 724
 725         LL_GET_INTENT(dentry, it);
 726
 727         if ((!it || !it->it_disposition) && !ext2_empty_dir(inode))
 728                 RETURN(-ENOTEMPTY);
 729
 730         rc = ll_common_unlink(dir, dentry, it, S_IFDIR);
 731         if (!rc) {
 732                 inode->i_size = 0;
 733                 ext2_dec_count(inode);
 734                 ext2_dec_count(dir);
 735         }
 736
 737         RETURN(rc);
 738 }
 739
 740 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 741                      struct inode * new_dir, struct dentry * new_dentry)
 742 {
 743         struct lookup_intent *it;
 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;
 751
 752         LL_GET_INTENT(new_dentry, it);
 753
 754         if (it && it->it_disposition) {
 755                 if (tgt_inode) {
 756                         tgt_inode->i_ctime = CURRENT_TIME;
 757                         tgt_inode->i_nlink--;
 758                 }
 759                 ll_invalidate_inode_pages(old_dir);
 760                 ll_invalidate_inode_pages(new_dir);
 761                 GOTO(out, err = it->it_status);
 762         }
 763
 764         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 765         if (err)
 766                 goto out;
 767
 768         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 769         if (!old_de)
 770                 goto out;
 771
 772         if (S_ISDIR(old_inode->i_mode)) {
 773                 err = -EIO;
 774                 dir_de = ext2_dotdot(old_inode, &dir_page);
 775                 if (!dir_de)
 776                         goto out_old;
 777         }
 778
 779         if (tgt_inode) {
 780                 struct page *new_page;
 781                 struct ext2_dir_entry_2 *new_de;
 782
 783                 err = -ENOTEMPTY;
 784                 if (dir_de && !ext2_empty_dir (tgt_inode))
 785                         goto out_dir;
 786
 787                 err = -ENOENT;
 788                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 789                 if (!new_de)
 790                         goto out_dir;
 791                 ext2_inc_count(old_inode);
 792                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 793                 tgt_inode->i_ctime = CURRENT_TIME;
 794                 if (dir_de)
 795                         tgt_inode->i_nlink--;
 796                 ext2_dec_count(tgt_inode);
 797         } else {
 798                 if (dir_de) {
 799                         err = -EMLINK;
 800                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 801                                 goto out_dir;
 802                 }
 803                 ext2_inc_count(old_inode);
 804                 err = ll_add_link(new_dentry, old_inode);
 805                 if (err) {
 806                         ext2_dec_count(old_inode);
 807                         goto out_dir;
 808                 }
 809                 if (dir_de)
 810                         ext2_inc_count(new_dir);
 811         }
 812
 813         ext2_delete_entry (old_de, old_page);
 814         ext2_dec_count(old_inode);
 815
 816         if (dir_de) {
 817                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 818                 ext2_dec_count(old_dir);
 819         }
 820         return 0;
 821
 822 out_dir:
 823         if (dir_de) {
 824                 kunmap(dir_page);
 825                 page_cache_release(dir_page);
 826         }
 827 out_old:
 828         kunmap(old_page);
 829         page_cache_release(old_page);
 830 out:
 831         return err;
 832 }
 833
 834 struct inode_operations ll_dir_inode_operations = {
 835         create:         ll_create,
 836         lookup2:        ll_lookup2,
 837         link:           ll_link,
 838         unlink:         ll_unlink,
 839         symlink:        ll_symlink,
 840         mkdir:          ll_mkdir,
 841         rmdir:          ll_rmdir,
 842         mknod:          ll_mknod,
 843         rename:         ll_rename,
 844         setattr:        ll_setattr
 845 };