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/smp_lock.h>
  32 #include <linux/quotaops.h>
  33 #include <linux/highmem.h>
  34 #include <linux/pagemap.h>
  35
  36 #define DEBUG_SUBSYSTEM S_LLITE
  37
  38 #include <linux/obd_support.h>
  39 #include <linux/lustre_lite.h>
  40 #include <linux/lustre_dlm.h>
  41 #include <linux/obd_lov.h>
  42
  43 extern struct address_space_operations ll_aops;
  44
  45 /* from super.c */
  46 extern void ll_change_inode(struct inode *inode);
  47 extern int ll_setattr(struct dentry *de, struct iattr *attr);
  48
  49 /* from dir.c */
  50 extern int ll_add_link (struct dentry *dentry, struct inode *inode);
  51 obd_id ll_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
  52 int ext2_make_empty(struct inode *inode, struct inode *parent);
  53 struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
  54                    struct dentry *dentry, struct page ** res_page);
  55 int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
  56 int ext2_empty_dir (struct inode * inode);
  57 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
  58 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
  59                    struct page *page, struct inode *inode);
  60
  61 /*
  62  * Couple of helper functions - make the code slightly cleaner.
  63  */
  64 static inline void ext2_inc_count(struct inode *inode)
  65 {
  66         inode->i_nlink++;
  67 }
  68
  69 /* postpone the disk update until the inode really goes away */
  70 static inline void ext2_dec_count(struct inode *inode)
  71 {
  72         inode->i_nlink--;
  73 }
  74
  75 static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
  76 {
  77         int err;
  78         err = ll_add_link(dentry, inode);
  79         if (!err) {
  80                 d_instantiate(dentry, inode);
  81                 return 0;
  82         }
  83         ext2_dec_count(inode);
  84         iput(inode);
  85         return err;
  86 }
  87
  88 /* methods */
  89 static int ll_find_inode(struct inode *inode, unsigned long ino, void *opaque)
  90 {
  91         struct ll_read_inode2_cookie *lic = opaque;
  92         struct mds_body *body = lic->lic_body;
  93
  94         if (inode->i_generation != lic->lic_body->generation)
  95                 return 0;
  96
  97         /* Apply the attributes in 'opaque' to this inode */
  98         ll_update_inode(inode, body);
  99
 100         return 1;
 101 }
 102
 103 extern struct dentry_operations ll_d_ops;
 104
 105 int ll_lock(struct inode *dir, struct dentry *dentry,
 106             struct lookup_intent *it, struct lustre_handle *lockh)
 107 {
 108         struct ll_sb_info *sbi = ll_i2sbi(dir);
 109         char *tgt = NULL;
 110         int tgtlen = 0;
 111         int err, lock_mode;
 112
 113         /* CREAT needs to be tested before open (both could be set) */
 114         if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SETATTR | IT_MKNOD))) {
 115                 lock_mode = LCK_PW;
 116         } else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
 117                                 IT_RMDIR | IT_RENAME | IT_RENAME2 | IT_READLINK|
 118                                 IT_LINK | IT_LINK2 | IT_LOOKUP)) {
 119                 /* XXXphil PW for LINK2/RENAME2? */
 120                 lock_mode = LCK_PR;
 121         } else if (it->it_op & IT_SYMLINK) {
 122                 lock_mode = LCK_PW;
 123                 tgt = it->it_data;
 124                 tgtlen = strlen(tgt);
 125                 it->it_data = NULL;
 126         } else {
 127                 LBUG();
 128                 RETURN(-EINVAL);
 129         }
 130
 131         err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT, it, lock_mode,
 132                           dir, dentry, lockh, tgt, tgtlen, dir, sizeof(*dir));
 133
 134         RETURN(err);
 135 }
 136
 137 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
 138 {
 139         ENTRY;
 140
 141         ldlm_lock_decref(lockh, mode);
 142
 143         RETURN(0);
 144 }
 145
 146 static struct dentry *ll_lookup2(struct inode *dir, struct dentry *dentry,
 147                                  struct lookup_intent *it)
 148 {
 149         struct ptlrpc_request *request = NULL;
 150         struct inode * inode = NULL;
 151         struct ll_sb_info *sbi = ll_i2sbi(dir);
 152         struct ll_read_inode2_cookie lic;
 153         struct lustre_handle lockh;
 154         struct lookup_intent lookup_it = { IT_LOOKUP };
 155         int rc, offset;
 156         obd_id ino = 0;
 157
 158         ENTRY;
 159
 160         /* CHECK_MOUNT_EPOCH(dir); */
 161         if (ll_i2info(dir)->lli_mount_epoch != ll_i2sbi(dir)->ll_mount_epoch) {
 162                 make_bad_inode(dir);
 163                 RETURN(ERR_PTR(-EIO));
 164         }
 165
 166         if (it == NULL)
 167                 it = &lookup_it;
 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         rc = ll_lock(dir, dentry, it, &lockh);
 176         if (rc < 0)
 177                 RETURN(ERR_PTR(rc));
 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                                         IT_READLINK)) {
 197                         /* For check ops, we want the lookup to succeed */
 198                         it->it_data = NULL;
 199                         if (it->it_status)
 200                                 GOTO(neg_req, NULL);
 201                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 202                         /* For rename, we want the source lookup to succeed */
 203                         if (it->it_status) {
 204                                 it->it_data = NULL;
 205                                 GOTO(drop_req, rc = it->it_status);
 206                         }
 207                         it->it_data = dentry;
 208                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 209                         /* For remove ops, we want the lookup to succeed unless
 210                          * the file truly doesn't exist */
 211                         it->it_data = NULL;
 212                         if (it->it_status == -ENOENT)
 213                                 GOTO(neg_req, NULL);
 214                         goto iget;
 215                 } else if (it->it_op == IT_OPEN) {
 216                         it->it_data = NULL;
 217                         if (it->it_status && it->it_status != -EEXIST)
 218                                 GOTO(neg_req, NULL);
 219                 } else if (it->it_op & (IT_RENAME2 | IT_LINK2)) {
 220                         struct mds_body *body =
 221                                 lustre_msg_buf(request->rq_repmsg, offset);
 222                         it->it_data = NULL;
 223                         /* This means the target lookup is negative */
 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                 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 238                                  valid, symlen, &request);
 239                 if (rc) {
 240                         CERROR("failure %d inode "LPX64"\n", rc, ino);
 241                         GOTO(drop_req, rc = -abs(rc));
 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, rc = -ENOENT);
 256                 }
 257
 258                 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 259                                  OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 260                 if (rc) {
 261                         CERROR("failure %d inode "LPX64"\n", rc, ino);
 262                         GOTO(drop_req, rc = -abs(rc));
 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, it);
 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 (it->it_status == 0) {
 293                 LL_SAVE_INTENT(dentry, it);
 294         }
 295         else {
 296                 dentry->d_it = NULL;
 297                 CDEBUG(D_DENTRY,
 298                        "D_IT dentry %p fsdata %p intent: %s status %d\n",
 299                        dentry, ll_d2d(dentry), ldlm_it2str(it->it_op),
 300                        it->it_status);
 301         }
 302
 303         if (it->it_op == IT_LOOKUP)
 304                 ll_intent_release(dentry, it);
 305
 306         return NULL;
 307
 308  drop_req:
 309         ptlrpc_free_req(request);
 310  drop_lock:
 311 #warning FIXME: must release lock here
 312         return ERR_PTR(rc);
 313 }
 314
 315 static struct inode *ll_create_node(struct inode *dir, const char *name,
 316                                     int namelen, const char *tgt, int tgtlen,
 317                                     int mode, __u64 extra,
 318                                     struct lookup_intent *it,
 319                                     struct lov_stripe_md *lsm)
 320 {
 321         struct inode *inode;
 322         struct ptlrpc_request *request = NULL;
 323         struct mds_body *body;
 324         time_t time = CURRENT_TIME;
 325         struct ll_sb_info *sbi = ll_i2sbi(dir);
 326         struct ll_read_inode2_cookie lic;
 327         struct lov_mds_md *lmm = NULL;
 328         ENTRY;
 329
 330         if (it && it->it_disposition) {
 331                 int rc = it->it_status;
 332                 if (rc) {
 333                         CERROR("error creating MDS inode for %*s: rc = %d\n",
 334                                namelen, name, rc);
 335                         RETURN(ERR_PTR(rc));
 336                 }
 337                 invalidate_inode_pages(dir);
 338                 request = it->it_data;
 339                 body = lustre_msg_buf(request->rq_repmsg, 1);
 340                 lic.lic_lmm = NULL;
 341         } else {
 342                 int gid = current->fsgid;
 343                 int rc;
 344
 345                 if (lsm) {
 346                         OBD_ALLOC(lmm, lsm->lsm_mds_easize);
 347                         if (!lmm)
 348                                 RETURN(ERR_PTR(-ENOMEM));
 349                         lov_packmd(lmm, lsm);
 350                         lic.lic_lmm = lmm;
 351                 } else
 352                         lic.lic_lmm = NULL;
 353
 354                 if (dir->i_mode & S_ISGID) {
 355                         gid = dir->i_gid;
 356                         if (S_ISDIR(mode))
 357                                 mode |= S_ISGID;
 358                 }
 359
 360                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 361                                 tgtlen, mode, current->fsuid, gid,
 362                                 time, extra, lsm, &request);
 363                 if (rc) {
 364                         inode = ERR_PTR(rc);
 365                         GOTO(out, rc);
 366                 }
 367                 body = lustre_msg_buf(request->rq_repmsg, 0);
 368         }
 369
 370         lic.lic_body = body;
 371
 372         LASSERT(body->ino != 0);
 373         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 374         if (IS_ERR(inode)) {
 375                 int rc = PTR_ERR(inode);
 376                 CERROR("new_inode -fatal: rc %d\n", rc);
 377                 LBUG();
 378                 GOTO(out, rc);
 379         }
 380
 381         if (!list_empty(&inode->i_dentry)) {
 382                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 383                        body->ino, atomic_read(&inode->i_count),
 384                        inode->i_nlink);
 385                 iput(inode);
 386                 LBUG();
 387                 inode = ERR_PTR(-EIO);
 388                 GOTO(out, -EIO);
 389         }
 390
 391         EXIT;
 392  out:
 393         if (lsm && lmm)
 394                 OBD_FREE(lmm, lsm->lsm_mds_easize);
 395         ptlrpc_req_finished(request);
 396         return inode;
 397 }
 398
 399 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 400                          const char *name, int len)
 401 {
 402         struct ptlrpc_request *request = NULL;
 403         struct ll_sb_info *sbi = ll_i2sbi(dir);
 404         int err;
 405
 406         ENTRY;
 407
 408         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 409                          &request);
 410         ptlrpc_req_finished(request);
 411
 412         RETURN(err);
 413 }
 414
 415 int ll_mdc_link(struct dentry *src, struct inode *dir,
 416                 const char *name, int len)
 417 {
 418         struct ptlrpc_request *request = NULL;
 419         int err;
 420         struct ll_sb_info *sbi = ll_i2sbi(dir);
 421
 422         ENTRY;
 423
 424         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name, len, &request);
 425         ptlrpc_req_finished(request);
 426
 427         RETURN(err);
 428 }
 429
 430 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 431                   struct dentry *old, struct dentry *new)
 432 {
 433         struct ptlrpc_request *request = NULL;
 434         struct ll_sb_info *sbi = ll_i2sbi(src);
 435         int err;
 436
 437         ENTRY;
 438
 439         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 440                          old->d_name.name, old->d_name.len,
 441                          new->d_name.name, new->d_name.len, &request);
 442         ptlrpc_req_finished(request);
 443
 444         RETURN(err);
 445 }
 446
 447 /*
 448  * By the time this is called, we already have created the directory cache
 449  * entry for the new file, but it is so far negative - it has no inode.
 450  * We defer creating the OBD object(s) until open, to keep the intent and
 451  * non-intent code paths similar, and also because we do not have the MDS
 452  * inode number before calling ll_create_node() (which is needed for LOV),
 453  * so we would need to do yet another RPC to the MDS to store the LOV EA
 454  * data on the MDS.
 455  *
 456  * If the create succeeds, we fill in the inode information
 457  * with d_instantiate().
 458  */
 459 static int ll_create(struct inode *dir, struct dentry *dentry, int mode)
 460 {
 461         struct lookup_intent *it;
 462         struct inode *inode;
 463         int rc = 0;
 464         ENTRY;
 465
 466         CHECK_MOUNT_EPOCH(dir);
 467
 468         LL_GET_INTENT(dentry, it);
 469
 470         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 471                                NULL, 0, mode, 0, it, NULL);
 472
 473         if (IS_ERR(inode))
 474                 RETURN(PTR_ERR(inode));
 475
 476         if (it->it_disposition) {
 477                 struct ll_inode_info *lli = ll_i2info(inode);
 478                 memcpy(&lli->lli_intent_lock_handle, it->it_lock_handle,
 479                        sizeof(lli->lli_intent_lock_handle));
 480                 d_instantiate(dentry, inode);
 481         } else {
 482                 /* no directory data updates when intents rule */
 483                 rc = ext2_add_nondir(dentry, inode);
 484         }
 485
 486         RETURN(rc);
 487 }
 488
 489 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 490                     int rdev)
 491 {
 492         struct lookup_intent *it;
 493         struct inode *inode;
 494         int rc = 0;
 495
 496         LL_GET_INTENT(dentry, it);
 497
 498         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 499                                NULL, 0, mode, rdev, it, NULL);
 500
 501         if (IS_ERR(inode))
 502                 RETURN(PTR_ERR(inode));
 503
 504         /* no directory data updates when intents rule */
 505         if (it && it->it_disposition)
 506                 d_instantiate(dentry, inode);
 507         else
 508                 rc = ext2_add_nondir(dentry, inode);
 509
 510         return rc;
 511 }
 512
 513 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 514                       const char *symname)
 515 {
 516         struct lookup_intent *it;
 517         unsigned l = strlen(symname);
 518         struct inode *inode;
 519         struct ll_inode_info *lli;
 520         int err = 0;
 521         ENTRY;
 522
 523         CHECK_MOUNT_EPOCH(dir);
 524
 525         LL_GET_INTENT(dentry, it);
 526
 527         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 528                                symname, l, S_IFLNK | S_IRWXUGO, 0, it, NULL);
 529         if (IS_ERR(inode))
 530                 RETURN(PTR_ERR(inode));
 531
 532         lli = ll_i2info(inode);
 533
 534         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 535         /* this _could_ be a non-fatal error, since the symlink is already
 536          * stored on the MDS by this point, and we can re-get it in readlink.
 537          */
 538         if (!lli->lli_symlink_name)
 539                 RETURN(-ENOMEM);
 540
 541         memcpy(lli->lli_symlink_name, symname, l + 1);
 542         inode->i_size = l;
 543
 544         /* no directory data updates when intents rule */
 545         if (it && it->it_disposition)
 546                 d_instantiate(dentry, inode);
 547         else
 548                 err = ext2_add_nondir(dentry, inode);
 549
 550         RETURN(err);
 551 }
 552
 553 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 554                    struct dentry *dentry)
 555 {
 556         struct lookup_intent *it;
 557         struct inode *inode = old_dentry->d_inode;
 558         int rc;
 559
 560         LL_GET_INTENT(dentry, it);
 561
 562         if (it && it->it_disposition) {
 563                 if (it->it_status)
 564                         RETURN(it->it_status);
 565                 inode->i_ctime = CURRENT_TIME;
 566                 ext2_inc_count(inode);
 567                 atomic_inc(&inode->i_count);
 568                 d_instantiate(dentry, inode);
 569                 invalidate_inode_pages(dir);
 570                 RETURN(0);
 571         }
 572
 573         if (S_ISDIR(inode->i_mode))
 574                 return -EPERM;
 575
 576         if (inode->i_nlink >= EXT2_LINK_MAX)
 577                 return -EMLINK;
 578
 579         rc = ll_mdc_link(old_dentry, dir,
 580                           dentry->d_name.name, dentry->d_name.len);
 581         if (rc)
 582                 RETURN(rc);
 583
 584         inode->i_ctime = CURRENT_TIME;
 585         ext2_inc_count(inode);
 586         atomic_inc(&inode->i_count);
 587
 588         return ext2_add_nondir(dentry, inode);
 589 }
 590
 591 static int ll_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 592 {
 593         struct lookup_intent *it;
 594         struct inode * inode;
 595         int err = -EMLINK;
 596         ENTRY;
 597
 598         LL_GET_INTENT(dentry, it);
 599
 600         if (dir->i_nlink >= EXT2_LINK_MAX)
 601                 goto out;
 602
 603         ext2_inc_count(dir);
 604
 605         it = dentry->d_it;
 606
 607         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 608                                NULL, 0, S_IFDIR | mode, 0, it, NULL);
 609         err = PTR_ERR(inode);
 610         if (IS_ERR(inode))
 611                 goto out_dir;
 612
 613         ext2_inc_count(inode);
 614
 615         err = ext2_make_empty(inode, dir);
 616         if (err)
 617                 goto out_fail;
 618
 619         /* no directory data updates when intents rule */
 620         if (!it || !it->it_disposition) {
 621                 err = ll_add_link(dentry, inode);
 622                 if (err)
 623                         goto out_fail;
 624         }
 625
 626         d_instantiate(dentry, inode);
 627 out:
 628         EXIT;
 629         return err;
 630
 631 out_fail:
 632         ext2_dec_count(inode);
 633         ext2_dec_count(inode);
 634         iput(inode);
 635         EXIT;
 636 out_dir:
 637         ext2_dec_count(dir);
 638         EXIT;
 639         goto out;
 640 }
 641
 642 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 643                             struct lookup_intent *it, __u32 mode)
 644 {
 645         struct inode *inode = dentry->d_inode;
 646         struct ext2_dir_entry_2 * de;
 647         struct page * page;
 648         int rc = 0;
 649
 650         if (it && it->it_disposition) {
 651                 rc = it->it_status;
 652                 invalidate_inode_pages(dir);
 653                 if (rc)
 654                         GOTO(out, rc);
 655                 GOTO(out_dec, 0);
 656         }
 657
 658         de = ext2_find_entry(dir, dentry, &page);
 659         if (!de)
 660                 GOTO(out, rc = -ENOENT);
 661         rc = ll_mdc_unlink(dir, dentry->d_inode, mode,
 662                            dentry->d_name.name, dentry->d_name.len);
 663         if (rc)
 664                 GOTO(out, rc);
 665
 666         rc = ext2_delete_entry(de, page);
 667         if (rc)
 668                 GOTO(out, rc);
 669
 670         /* AED: not sure if needed - directory lock revocation should do it
 671          * in the case where the client has cached it for non-intent ops.
 672          */
 673         invalidate_inode_pages(dir);
 674
 675         inode->i_ctime = dir->i_ctime;
 676 out_dec:
 677         ext2_dec_count(inode);
 678 out:
 679         return rc;
 680 }
 681
 682 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 683 {
 684         struct lookup_intent * it;
 685
 686         LL_GET_INTENT(dentry, it);
 687
 688         return ll_common_unlink(dir, dentry, it, S_IFREG);
 689 }
 690
 691 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 692 {
 693         struct inode * inode = dentry->d_inode;
 694         struct lookup_intent *it;
 695         int rc;
 696         ENTRY;
 697
 698         LL_GET_INTENT(dentry, it);
 699
 700
 701         if ((!it || !it->it_disposition) && !ext2_empty_dir(inode))
 702                 RETURN(-ENOTEMPTY);
 703
 704         rc = ll_common_unlink(dir, dentry, it, S_IFDIR);
 705         if (!rc) {
 706                 inode->i_size = 0;
 707                 ext2_dec_count(inode);
 708                 ext2_dec_count(dir);
 709         }
 710
 711         RETURN(rc);
 712 }
 713
 714 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 715                      struct inode * new_dir, struct dentry * new_dentry)
 716 {
 717         struct lookup_intent *it;
 718         struct inode * old_inode = old_dentry->d_inode;
 719         struct inode * tgt_inode = new_dentry->d_inode;
 720         struct page * dir_page = NULL;
 721         struct ext2_dir_entry_2 * dir_de = NULL;
 722         struct ext2_dir_entry_2 * old_de;
 723         struct page * old_page;
 724         int err;
 725
 726         LL_GET_INTENT(new_dentry, it);
 727
 728         if (it && it->it_disposition) {
 729                 if (tgt_inode) {
 730                         tgt_inode->i_ctime = CURRENT_TIME;
 731                         tgt_inode->i_nlink--;
 732                 }
 733                 invalidate_inode_pages(old_dir);
 734                 invalidate_inode_pages(new_dir);
 735                 GOTO(out, err = it->it_status);
 736         }
 737
 738         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 739         if (err)
 740                 goto out;
 741
 742         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 743         if (!old_de)
 744                 goto out;
 745
 746         if (S_ISDIR(old_inode->i_mode)) {
 747                 err = -EIO;
 748                 dir_de = ext2_dotdot(old_inode, &dir_page);
 749                 if (!dir_de)
 750                         goto out_old;
 751         }
 752
 753         if (tgt_inode) {
 754                 struct page *new_page;
 755                 struct ext2_dir_entry_2 *new_de;
 756
 757                 err = -ENOTEMPTY;
 758                 if (dir_de && !ext2_empty_dir (tgt_inode))
 759                         goto out_dir;
 760
 761                 err = -ENOENT;
 762                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 763                 if (!new_de)
 764                         goto out_dir;
 765                 ext2_inc_count(old_inode);
 766                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 767                 tgt_inode->i_ctime = CURRENT_TIME;
 768                 if (dir_de)
 769                         tgt_inode->i_nlink--;
 770                 ext2_dec_count(tgt_inode);
 771         } else {
 772                 if (dir_de) {
 773                         err = -EMLINK;
 774                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 775                                 goto out_dir;
 776                 }
 777                 ext2_inc_count(old_inode);
 778                 err = ll_add_link(new_dentry, old_inode);
 779                 if (err) {
 780                         ext2_dec_count(old_inode);
 781                         goto out_dir;
 782                 }
 783                 if (dir_de)
 784                         ext2_inc_count(new_dir);
 785         }
 786
 787         ext2_delete_entry (old_de, old_page);
 788         ext2_dec_count(old_inode);
 789
 790         if (dir_de) {
 791                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 792                 ext2_dec_count(old_dir);
 793         }
 794         return 0;
 795
 796 out_dir:
 797         if (dir_de) {
 798                 kunmap(dir_page);
 799                 page_cache_release(dir_page);
 800         }
 801 out_old:
 802         kunmap(old_page);
 803         page_cache_release(old_page);
 804 out:
 805         return err;
 806 }
 807
 808 struct inode_operations ll_dir_inode_operations = {
 809         create:         ll_create,
 810         lookup2:        ll_lookup2,
 811         link:           ll_link,
 812         unlink:         ll_unlink,
 813         symlink:        ll_symlink,
 814         mkdir:          ll_mkdir,
 815         rmdir:          ll_rmdir,
 816         mknod:          ll_mknod,
 817         rename:         ll_rename,
 818         setattr:        ll_setattr
 819 };