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 rc, 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         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);
 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(rc);
 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         time_t time = CURRENT_TIME;
 319         struct ll_sb_info *sbi = ll_i2sbi(dir);
 320         struct ll_read_inode2_cookie lic;
 321         struct lov_mds_md *lmm = NULL;
 322         ENTRY;
 323
 324         if (it && it->it_disposition) {
 325                 int rc = it->it_status;
 326                 if (rc) {
 327                         CERROR("error creating MDS inode for %*s: rc = %d\n",
 328                                namelen, name, rc);
 329                         RETURN(ERR_PTR(rc));
 330                 }
 331                 invalidate_inode_pages(dir);
 332                 request = it->it_data;
 333                 body = lustre_msg_buf(request->rq_repmsg, 1);
 334                 lic.lic_lmm = NULL;
 335         } else {
 336                 int gid = current->fsgid;
 337                 int rc;
 338
 339                 if (lsm) {
 340                         OBD_ALLOC(lmm, lsm->lsm_mds_easize);
 341                         if (!lmm)
 342                                 RETURN(ERR_PTR(-ENOMEM));
 343                         lov_packmd(lmm, lsm);
 344                         lic.lic_lmm = lmm;
 345                 } else
 346                         lic.lic_lmm = NULL;
 347
 348                 if (dir->i_mode & S_ISGID) {
 349                         gid = dir->i_gid;
 350                         if (S_ISDIR(mode))
 351                                 mode |= S_ISGID;
 352                 }
 353
 354                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 355                                 tgtlen, mode, current->fsuid, gid,
 356                                 time, extra, lsm, &request);
 357                 if (rc) {
 358                         inode = ERR_PTR(rc);
 359                         GOTO(out, rc);
 360                 }
 361                 body = lustre_msg_buf(request->rq_repmsg, 0);
 362         }
 363
 364         lic.lic_body = body;
 365
 366         LASSERT(body->ino != 0);
 367         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 368         if (IS_ERR(inode)) {
 369                 int rc = PTR_ERR(inode);
 370                 CERROR("new_inode -fatal: rc %d\n", rc);
 371                 LBUG();
 372                 GOTO(out, rc);
 373         }
 374
 375         if (!list_empty(&inode->i_dentry)) {
 376                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 377                        body->ino, atomic_read(&inode->i_count),
 378                        inode->i_nlink);
 379                 iput(inode);
 380                 LBUG();
 381                 inode = ERR_PTR(-EIO);
 382                 GOTO(out, -EIO);
 383         }
 384
 385         EXIT;
 386  out:
 387         if (lsm && lmm)
 388                 OBD_FREE(lmm, lsm->lsm_mds_easize);
 389         ptlrpc_req_finished(request);
 390         return inode;
 391 }
 392
 393 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 394                          const char *name, int len)
 395 {
 396         struct ptlrpc_request *request = NULL;
 397         struct ll_sb_info *sbi = ll_i2sbi(dir);
 398         int err;
 399
 400         ENTRY;
 401
 402         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 403                          &request);
 404         ptlrpc_req_finished(request);
 405
 406         RETURN(err);
 407 }
 408
 409 int ll_mdc_link(struct dentry *src, struct inode *dir,
 410                 const char *name, int len)
 411 {
 412         struct ptlrpc_request *request = NULL;
 413         int err;
 414         struct ll_sb_info *sbi = ll_i2sbi(dir);
 415
 416         ENTRY;
 417
 418         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name, len, &request);
 419         ptlrpc_req_finished(request);
 420
 421         RETURN(err);
 422 }
 423
 424 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 425                   struct dentry *old, struct dentry *new)
 426 {
 427         struct ptlrpc_request *request = NULL;
 428         struct ll_sb_info *sbi = ll_i2sbi(src);
 429         int err;
 430
 431         ENTRY;
 432
 433         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 434                          old->d_name.name, old->d_name.len,
 435                          new->d_name.name, new->d_name.len, &request);
 436         ptlrpc_req_finished(request);
 437
 438         RETURN(err);
 439 }
 440
 441 /*
 442  * By the time this is called, we already have created the directory cache
 443  * entry for the new file, but it is so far negative - it has no inode.
 444  * We defer creating the OBD object(s) until open, to keep the intent and
 445  * non-intent code paths similar, and also because we do not have the MDS
 446  * inode number before calling ll_create_node() (which is needed for LOV),
 447  * so we would need to do yet another RPC to the MDS to store the LOV EA
 448  * data on the MDS.
 449  *
 450  * If the create succeeds, we fill in the inode information
 451  * with d_instantiate().
 452  */
 453 static int ll_create(struct inode *dir, struct dentry *dentry, int mode)
 454 {
 455         struct lookup_intent *it;
 456         struct inode *inode;
 457         int rc = 0;
 458         ENTRY;
 459
 460         CHECK_MOUNT_EPOCH(dir);
 461
 462         it = dentry->d_it;
 463
 464         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 465                                NULL, 0, mode, 0, it, NULL);
 466
 467         if (IS_ERR(inode))
 468                 RETURN(PTR_ERR(inode));
 469
 470         if (it->it_disposition) {
 471                 struct ll_inode_info *lli = ll_i2info(inode);
 472                 memcpy(&lli->lli_intent_lock_handle, it->it_lock_handle,
 473                        sizeof(lli->lli_intent_lock_handle));
 474                 d_instantiate(dentry, inode);
 475         } else {
 476                 /* no directory data updates when intents rule */
 477                 rc = ext2_add_nondir(dentry, inode);
 478         }
 479
 480         RETURN(rc);
 481 }
 482
 483 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 484                     int rdev)
 485 {
 486         struct lookup_intent *it;
 487         struct inode *inode;
 488         int rc = 0;
 489
 490         it = dentry->d_it;
 491
 492         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 493                                NULL, 0, mode, rdev, it, NULL);
 494
 495         if (IS_ERR(inode))
 496                 RETURN(PTR_ERR(inode));
 497
 498         /* no directory data updates when intents rule */
 499         if (it && it->it_disposition)
 500                 d_instantiate(dentry, inode);
 501         else
 502                 rc = ext2_add_nondir(dentry, inode);
 503
 504         return rc;
 505 }
 506
 507 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 508                       const char *symname)
 509 {
 510         struct lookup_intent *it;
 511         unsigned l = strlen(symname);
 512         struct inode *inode;
 513         struct ll_inode_info *lli;
 514         int err = 0;
 515         ENTRY;
 516
 517         CHECK_MOUNT_EPOCH(dir);
 518
 519         it = dentry->d_it;
 520
 521         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 522                                symname, l, S_IFLNK | S_IRWXUGO, 0, it, NULL);
 523         if (IS_ERR(inode))
 524                 RETURN(PTR_ERR(inode));
 525
 526         lli = ll_i2info(inode);
 527
 528         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 529         /* this _could_ be a non-fatal error, since the symlink is already
 530          * stored on the MDS by this point, and we can re-get it in readlink.
 531          */
 532         if (!lli->lli_symlink_name)
 533                 RETURN(-ENOMEM);
 534
 535         memcpy(lli->lli_symlink_name, symname, l + 1);
 536         inode->i_size = l;
 537
 538         /* no directory data updates when intents rule */
 539         if (it && it->it_disposition)
 540                 d_instantiate(dentry, inode);
 541         else
 542                 err = ext2_add_nondir(dentry, inode);
 543
 544         RETURN(err);
 545 }
 546
 547 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 548                    struct dentry *dentry)
 549 {
 550         struct lookup_intent *it;
 551         struct inode *inode = old_dentry->d_inode;
 552         int rc;
 553
 554         it = dentry->d_it;
 555
 556         if (it && it->it_disposition) {
 557                 if (it->it_status)
 558                         RETURN(it->it_status);
 559                 inode->i_ctime = CURRENT_TIME;
 560                 ext2_inc_count(inode);
 561                 atomic_inc(&inode->i_count);
 562                 d_instantiate(dentry, inode);
 563                 invalidate_inode_pages(dir);
 564                 RETURN(0);
 565         }
 566
 567         if (S_ISDIR(inode->i_mode))
 568                 return -EPERM;
 569
 570         if (inode->i_nlink >= EXT2_LINK_MAX)
 571                 return -EMLINK;
 572
 573         rc = ll_mdc_link(old_dentry, dir,
 574                           dentry->d_name.name, dentry->d_name.len);
 575         if (rc)
 576                 RETURN(rc);
 577
 578         inode->i_ctime = CURRENT_TIME;
 579         ext2_inc_count(inode);
 580         atomic_inc(&inode->i_count);
 581
 582         return ext2_add_nondir(dentry, inode);
 583 }
 584
 585 static int ll_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 586 {
 587         struct lookup_intent *it;
 588         struct inode * inode;
 589         int err = -EMLINK;
 590         ENTRY;
 591
 592         if (dir->i_nlink >= EXT2_LINK_MAX)
 593                 goto out;
 594
 595         ext2_inc_count(dir);
 596
 597         it = dentry->d_it;
 598
 599         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 600                                NULL, 0, S_IFDIR | mode, 0, it, NULL);
 601         err = PTR_ERR(inode);
 602         if (IS_ERR(inode))
 603                 goto out_dir;
 604
 605         ext2_inc_count(inode);
 606
 607         err = ext2_make_empty(inode, dir);
 608         if (err)
 609                 goto out_fail;
 610
 611         /* no directory data updates when intents rule */
 612         if (!it || !it->it_disposition) {
 613                 err = ll_add_link(dentry, inode);
 614                 if (err)
 615                         goto out_fail;
 616         }
 617
 618         d_instantiate(dentry, inode);
 619 out:
 620         EXIT;
 621         return err;
 622
 623 out_fail:
 624         ext2_dec_count(inode);
 625         ext2_dec_count(inode);
 626         iput(inode);
 627         EXIT;
 628 out_dir:
 629         ext2_dec_count(dir);
 630         EXIT;
 631         goto out;
 632 }
 633
 634 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 635                             struct lookup_intent *it, __u32 mode)
 636 {
 637         struct inode *inode = dentry->d_inode;
 638         struct ext2_dir_entry_2 * de;
 639         struct page * page;
 640         int rc;
 641
 642         if (it && it->it_disposition) {
 643                 rc = it->it_status;
 644                 invalidate_inode_pages(dir);
 645                 if (rc)
 646                         GOTO(out, rc);
 647                 GOTO(out_dec, 0);
 648         }
 649
 650         de = ext2_find_entry(dir, dentry, &page);
 651         if (!de)
 652                 GOTO(out, rc = -ENOENT);
 653         rc = ll_mdc_unlink(dir, dentry->d_inode, mode,
 654                            dentry->d_name.name, dentry->d_name.len);
 655         if (rc)
 656                 GOTO(out, rc);
 657
 658         rc = ext2_delete_entry(de, page);
 659         if (rc)
 660                 GOTO(out, rc);
 661
 662         /* AED: not sure if needed - directory lock revocation should do it
 663          * in the case where the client has cached it for non-intent ops.
 664          */
 665         invalidate_inode_pages(dir);
 666
 667         inode->i_ctime = dir->i_ctime;
 668 out_dec:
 669         ext2_dec_count(inode);
 670 out:
 671         return rc;
 672 }
 673
 674 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 675 {
 676         struct lookup_intent *it;
 677
 678         it = dentry->d_it;
 679
 680         return ll_common_unlink(dir, dentry, it, S_IFREG);
 681 }
 682
 683 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 684 {
 685         struct inode * inode = dentry->d_inode;
 686         struct lookup_intent *it;
 687         int rc;
 688         ENTRY;
 689
 690         it = dentry->d_it;
 691
 692         if ((!it || !it->it_disposition) && !ext2_empty_dir(inode))
 693                 RETURN(-ENOTEMPTY);
 694
 695         rc = ll_common_unlink(dir, dentry, it, S_IFDIR);
 696         if (!rc) {
 697                 inode->i_size = 0;
 698                 ext2_dec_count(inode);
 699                 ext2_dec_count(dir);
 700         }
 701
 702         RETURN(rc);
 703 }
 704
 705 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 706                      struct inode * new_dir, struct dentry * new_dentry)
 707 {
 708         struct lookup_intent *it;
 709         struct inode * old_inode = old_dentry->d_inode;
 710         struct inode * tgt_inode = new_dentry->d_inode;
 711         struct page * dir_page = NULL;
 712         struct ext2_dir_entry_2 * dir_de = NULL;
 713         struct ext2_dir_entry_2 * old_de;
 714         struct page * old_page;
 715         int err;
 716
 717         it = new_dentry->d_it;
 718
 719         if (it && it->it_disposition) {
 720                 if (tgt_inode) {
 721                         tgt_inode->i_ctime = CURRENT_TIME;
 722                         tgt_inode->i_nlink--;
 723                 }
 724                 invalidate_inode_pages(old_dir);
 725                 invalidate_inode_pages(new_dir);
 726                 GOTO(out, err = it->it_status);
 727         }
 728
 729         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 730         if (err)
 731                 goto out;
 732
 733         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 734         if (!old_de)
 735                 goto out;
 736
 737         if (S_ISDIR(old_inode->i_mode)) {
 738                 err = -EIO;
 739                 dir_de = ext2_dotdot(old_inode, &dir_page);
 740                 if (!dir_de)
 741                         goto out_old;
 742         }
 743
 744         if (tgt_inode) {
 745                 struct page *new_page;
 746                 struct ext2_dir_entry_2 *new_de;
 747
 748                 err = -ENOTEMPTY;
 749                 if (dir_de && !ext2_empty_dir (tgt_inode))
 750                         goto out_dir;
 751
 752                 err = -ENOENT;
 753                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 754                 if (!new_de)
 755                         goto out_dir;
 756                 ext2_inc_count(old_inode);
 757                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 758                 tgt_inode->i_ctime = CURRENT_TIME;
 759                 if (dir_de)
 760                         tgt_inode->i_nlink--;
 761                 ext2_dec_count(tgt_inode);
 762         } else {
 763                 if (dir_de) {
 764                         err = -EMLINK;
 765                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 766                                 goto out_dir;
 767                 }
 768                 ext2_inc_count(old_inode);
 769                 err = ll_add_link(new_dentry, old_inode);
 770                 if (err) {
 771                         ext2_dec_count(old_inode);
 772                         goto out_dir;
 773                 }
 774                 if (dir_de)
 775                         ext2_inc_count(new_dir);
 776         }
 777
 778         ext2_delete_entry (old_de, old_page);
 779         ext2_dec_count(old_inode);
 780
 781         if (dir_de) {
 782                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 783                 ext2_dec_count(old_dir);
 784         }
 785         return 0;
 786
 787 out_dir:
 788         if (dir_de) {
 789                 kunmap(dir_page);
 790                 page_cache_release(dir_page);
 791         }
 792 out_old:
 793         kunmap(old_page);
 794         page_cache_release(old_page);
 795 out:
 796         return err;
 797 }
 798
 799 struct inode_operations ll_dir_inode_operations = {
 800         create:         ll_create,
 801         lookup2:        ll_lookup2,
 802         link:           ll_link,
 803         unlink:         ll_unlink,
 804         symlink:        ll_symlink,
 805         mkdir:          ll_mkdir,
 806         rmdir:          ll_rmdir,
 807         mknod:          ll_mknod,
 808         rename:         ll_rename,
 809         setattr:        ll_setattr
 810 };