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/highmem.h>
  33 #include <linux/pagemap.h>
  34
  35 #define DEBUG_SUBSYSTEM S_LLITE
  36
  37 #include <linux/obd_support.h>
  38 #include <linux/lustre_lite.h>
  39 #include <linux/lustre_dlm.h>
  40 #include <linux/obd_lov.h>
  41
  42 extern struct address_space_operations ll_aops;
  43
  44 /* from super.c */
  45 extern void ll_change_inode(struct inode *inode);
  46 extern int ll_setattr(struct dentry *de, struct iattr *attr);
  47
  48 /* from dir.c */
  49 extern int ll_add_link (struct dentry *dentry, struct inode *inode);
  50 obd_id ll_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
  51 int ext2_make_empty(struct inode *inode, struct inode *parent);
  52 struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
  53                    struct dentry *dentry, struct page ** res_page);
  54 int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
  55 int ext2_empty_dir (struct inode * inode);
  56 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
  57 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
  58                    struct page *page, struct inode *inode);
  59
  60 /*
  61  * Couple of helper functions - make the code slightly cleaner.
  62  */
  63 static inline void ext2_inc_count(struct inode *inode)
  64 {
  65         inode->i_nlink++;
  66 }
  67
  68 /* postpone the disk update until the inode really goes away */
  69 static inline void ext2_dec_count(struct inode *inode)
  70 {
  71         inode->i_nlink--;
  72 }
  73
  74 static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
  75 {
  76         int err;
  77         err = ll_add_link(dentry, inode);
  78         if (!err) {
  79                 d_instantiate(dentry, inode);
  80                 return 0;
  81         }
  82         ext2_dec_count(inode);
  83         iput(inode);
  84         return err;
  85 }
  86
  87 /* methods */
  88 static int ll_find_inode(struct inode *inode, unsigned long ino, void *opaque)
  89 {
  90         struct ll_read_inode2_cookie *lic = opaque;
  91         struct mds_body *body = lic->lic_body;
  92
  93         if (inode->i_generation != lic->lic_body->generation)
  94                 return 0;
  95
  96         /* Apply the attributes in 'opaque' to this inode */
  97         ll_update_inode(inode, body);
  98
  99         return 1;
 100 }
 101
 102 extern struct dentry_operations ll_d_ops;
 103
 104 int ll_lock(struct inode *dir, struct dentry *dentry,
 105             struct lookup_intent *it, struct lustre_handle *lockh)
 106 {
 107         struct ll_sb_info *sbi = ll_i2sbi(dir);
 108         char *tgt = NULL;
 109         int tgtlen = 0;
 110         int err, lock_mode;
 111
 112         /* CREAT needs to be tested before open (both could be set) */
 113         if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SETATTR | IT_MKNOD))) {
 114                 lock_mode = LCK_PW;
 115         } else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
 116                                 IT_RMDIR | IT_RENAME | IT_RENAME2 | IT_READLINK|
 117                                 IT_LINK | IT_LINK2 | IT_LOOKUP)) {
 118                 /* XXXphil PW for LINK2/RENAME2? */
 119                 lock_mode = LCK_PR;
 120         } else if (it->it_op & IT_SYMLINK) {
 121                 lock_mode = LCK_PW;
 122                 tgt = it->it_data;
 123                 tgtlen = strlen(tgt);
 124                 it->it_data = NULL;
 125         } else {
 126                 LBUG();
 127                 RETURN(-EINVAL);
 128         }
 129
 130         err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT, it, lock_mode,
 131                           dir, dentry, lockh, tgt, tgtlen, dir, sizeof(*dir));
 132
 133         RETURN(err);
 134 }
 135
 136 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
 137 {
 138         ENTRY;
 139
 140         ldlm_lock_decref(lockh, mode);
 141
 142         RETURN(0);
 143 }
 144
 145 static struct dentry *ll_lookup2(struct inode *dir, struct dentry *dentry,
 146                                  struct lookup_intent *it)
 147 {
 148         struct ptlrpc_request *request = NULL;
 149         struct inode * inode = NULL;
 150         struct ll_sb_info *sbi = ll_i2sbi(dir);
 151         struct ll_read_inode2_cookie lic;
 152         struct lustre_handle lockh;
 153         struct lookup_intent lookup_it = { IT_LOOKUP };
 154         int rc, offset;
 155         obd_id ino = 0;
 156
 157         ENTRY;
 158
 159         /* CHECK_MOUNT_EPOCH(dir); */
 160         if (ll_i2info(dir)->lli_mount_epoch != ll_i2sbi(dir)->ll_mount_epoch) {
 161                 make_bad_inode(dir);
 162                 RETURN(ERR_PTR(-EIO));
 163         }
 164
 165         if (it == NULL) {
 166                 it = &lookup_it;
 167                 dentry->d_it = it;
 168         }
 169
 170         CDEBUG(D_INFO, "name: %*s, intent: %s\n", dentry->d_name.len,
 171                dentry->d_name.name, ldlm_it2str(it->it_op));
 172
 173         if (dentry->d_name.len > EXT2_NAME_LEN)
 174                 RETURN(ERR_PTR(-ENAMETOOLONG));
 175
 176         rc = ll_lock(dir, dentry, it, &lockh);
 177         if (rc < 0)
 178                 RETURN(ERR_PTR(rc));
 179         memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
 180
 181         request = (struct ptlrpc_request *)it->it_data;
 182         if (it->it_disposition) {
 183                 int mode, symlen = 0;
 184                 obd_flag valid;
 185
 186                 offset = 1;
 187                 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 188                 ino = lic.lic_body->fid1.id;
 189                 mode = lic.lic_body->mode;
 190                 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
 191                         /* For create ops, we want the lookup to be negative,
 192                          * unless the create failed in a way that indicates
 193                          * that the file is already there */
 194                         if (it->it_status != -EEXIST)
 195                                 GOTO(negative, NULL);
 196                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP |
 197                                         IT_READLINK)) {
 198                         /* For check ops, we want the lookup to succeed */
 199                         it->it_data = NULL;
 200                         if (it->it_status)
 201                                 GOTO(neg_req, NULL);
 202                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 203                         /* For rename, we want the source lookup to succeed */
 204                         if (it->it_status) {
 205                                 it->it_data = NULL;
 206                                 GOTO(drop_req, rc = it->it_status);
 207                         }
 208                         it->it_data = dentry;
 209                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 210                         /* For remove ops, we want the lookup to succeed unless
 211                          * the file truly doesn't exist */
 212                         it->it_data = NULL;
 213                         if (it->it_status == -ENOENT)
 214                                 GOTO(neg_req, NULL);
 215                         goto iget;
 216                 } else if (it->it_op == IT_OPEN) {
 217                         it->it_data = NULL;
 218                         if (it->it_status && it->it_status != -EEXIST)
 219                                 GOTO(neg_req, NULL);
 220                 } else if (it->it_op & (IT_RENAME2 | IT_LINK2)) {
 221                         struct mds_body *body =
 222                                 lustre_msg_buf(request->rq_repmsg, offset);
 223                         it->it_data = NULL;
 224                         /* This means the target lookup is negative */
 225                         if (body->valid == 0)
 226                                 GOTO(neg_req, NULL);
 227                         goto iget;
 228                 }
 229
 230                 /* Do a getattr now that we have the lock */
 231                 valid = OBD_MD_FLNOTOBD | OBD_MD_FLEASIZE;
 232                 if (it->it_op == IT_READLINK) {
 233                         valid |= OBD_MD_LINKNAME;
 234                         symlen = lic.lic_body->size;
 235                 }
 236                 ptlrpc_req_finished(request);
 237                 request = NULL;
 238                 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 239                                  valid, symlen, &request);
 240                 if (rc) {
 241                         CERROR("failure %d inode "LPX64"\n", rc, ino);
 242                         GOTO(drop_req, rc = -abs(rc));
 243                 }
 244                 offset = 0;
 245         } else {
 246                 struct ll_inode_info *lli = ll_i2info(dir);
 247                 int mode;
 248
 249                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 250                 offset = 0;
 251
 252                 ino = ll_inode_by_name(dir, dentry, &mode);
 253                 if (!ino) {
 254                         CERROR("inode %*s not found by name\n",
 255                                dentry->d_name.len, dentry->d_name.name);
 256                         GOTO(drop_lock, rc = -ENOENT);
 257                 }
 258
 259                 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 260                                  OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 261                 if (rc) {
 262                         CERROR("failure %d inode "LPX64"\n", rc, ino);
 263                         GOTO(drop_req, rc = -abs(rc));
 264                 }
 265         }
 266
 267  iget:
 268         lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 269         if (S_ISREG(lic.lic_body->mode) &&
 270             lic.lic_body->valid & OBD_MD_FLEASIZE) {
 271                 LASSERT(request->rq_repmsg->bufcount > offset);
 272                 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
 273         } else
 274                 lic.lic_lmm = NULL;
 275
 276         /* No rpc's happen during iget4, -ENOMEM's are possible */
 277         LASSERT(ino != 0);
 278         inode = iget4(dir->i_sb, ino, ll_find_inode, &lic);
 279
 280         if (!inode) {
 281                 ptlrpc_free_req(request);
 282                 ll_intent_release(dentry);
 283                 RETURN(ERR_PTR(-ENOMEM));
 284         }
 285
 286         EXIT;
 287  neg_req:
 288         ptlrpc_req_finished(request);
 289  negative:
 290         dentry->d_op = &ll_d_ops;
 291         d_add(dentry, inode);
 292
 293         if (ll_d2d(dentry) == NULL)
 294                 ll_set_dd(dentry);
 295         // down(&ll_d2d(dentry)->lld_it_sem);
 296         // dentry->d_it = it;
 297
 298         if (it->it_op == IT_LOOKUP)
 299                 ll_intent_release(dentry);
 300
 301         return NULL;
 302
 303  drop_req:
 304         ptlrpc_free_req(request);
 305  drop_lock:
 306 #warning FIXME: must release lock here
 307         return ERR_PTR(rc);
 308 }
 309
 310 static struct inode *ll_create_node(struct inode *dir, const char *name,
 311                                     int namelen, const char *tgt, int tgtlen,
 312                                     int mode, __u64 extra,
 313                                     struct lookup_intent *it,
 314                                     struct lov_stripe_md *lsm)
 315 {
 316         struct inode *inode;
 317         struct ptlrpc_request *request = NULL;
 318         struct mds_body *body;
 319         time_t time = CURRENT_TIME;
 320         struct ll_sb_info *sbi = ll_i2sbi(dir);
 321         struct ll_read_inode2_cookie lic;
 322         struct lov_mds_md *lmm = NULL;
 323         ENTRY;
 324
 325         if (it && it->it_disposition) {
 326                 int rc = it->it_status;
 327                 if (rc) {
 328                         CERROR("error creating MDS inode for %*s: rc = %d\n",
 329                                namelen, name, rc);
 330                         RETURN(ERR_PTR(rc));
 331                 }
 332                 invalidate_inode_pages(dir);
 333                 request = it->it_data;
 334                 body = lustre_msg_buf(request->rq_repmsg, 1);
 335                 lic.lic_lmm = NULL;
 336         } else {
 337                 int gid = current->fsgid;
 338                 int rc;
 339
 340                 if (lsm) {
 341                         OBD_ALLOC(lmm, lsm->lsm_mds_easize);
 342                         if (!lmm)
 343                                 RETURN(ERR_PTR(-ENOMEM));
 344                         lov_packmd(lmm, lsm);
 345                         lic.lic_lmm = lmm;
 346                 } else
 347                         lic.lic_lmm = NULL;
 348
 349                 if (dir->i_mode & S_ISGID) {
 350                         gid = dir->i_gid;
 351                         if (S_ISDIR(mode))
 352                                 mode |= S_ISGID;
 353                 }
 354
 355                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 356                                 tgtlen, mode, current->fsuid, gid,
 357                                 time, extra, lsm, &request);
 358                 if (rc) {
 359                         inode = ERR_PTR(rc);
 360                         GOTO(out, rc);
 361                 }
 362                 body = lustre_msg_buf(request->rq_repmsg, 0);
 363         }
 364
 365         lic.lic_body = body;
 366
 367         LASSERT(body->ino != 0);
 368         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 369         if (IS_ERR(inode)) {
 370                 int 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 (lsm && lmm)
 389                 OBD_FREE(lmm, lsm->lsm_mds_easize);
 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, len, &request);
 420         ptlrpc_req_finished(request);
 421
 422         RETURN(err);
 423 }
 424
 425 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 426                   struct dentry *old, struct dentry *new)
 427 {
 428         struct ptlrpc_request *request = NULL;
 429         struct ll_sb_info *sbi = ll_i2sbi(src);
 430         int err;
 431
 432         ENTRY;
 433
 434         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 435                          old->d_name.name, old->d_name.len,
 436                          new->d_name.name, new->d_name.len, &request);
 437         ptlrpc_req_finished(request);
 438
 439         RETURN(err);
 440 }
 441
 442 /*
 443  * By the time this is called, we already have created the directory cache
 444  * entry for the new file, but it is so far negative - it has no inode.
 445  * We defer creating the OBD object(s) until open, to keep the intent and
 446  * non-intent code paths similar, and also because we do not have the MDS
 447  * inode number before calling ll_create_node() (which is needed for LOV),
 448  * so we would need to do yet another RPC to the MDS to store the LOV EA
 449  * data on the MDS.
 450  *
 451  * If the create succeeds, we fill in the inode information
 452  * with d_instantiate().
 453  */
 454 static int ll_create(struct inode *dir, struct dentry *dentry, int mode)
 455 {
 456         struct lookup_intent *it;
 457         struct inode *inode;
 458         int rc = 0;
 459         ENTRY;
 460
 461         CHECK_MOUNT_EPOCH(dir);
 462
 463         it = dentry->d_it;
 464
 465         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 466                                NULL, 0, mode, 0, it, NULL);
 467
 468         if (IS_ERR(inode))
 469                 RETURN(PTR_ERR(inode));
 470
 471         if (it->it_disposition) {
 472                 struct ll_inode_info *lli = ll_i2info(inode);
 473                 memcpy(&lli->lli_intent_lock_handle, it->it_lock_handle,
 474                        sizeof(lli->lli_intent_lock_handle));
 475                 d_instantiate(dentry, inode);
 476         } else {
 477                 /* no directory data updates when intents rule */
 478                 rc = ext2_add_nondir(dentry, inode);
 479         }
 480
 481         RETURN(rc);
 482 }
 483
 484 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 485                     int rdev)
 486 {
 487         struct lookup_intent *it;
 488         struct inode *inode;
 489         int rc = 0;
 490
 491         it = dentry->d_it;
 492
 493         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 494                                NULL, 0, mode, rdev, it, NULL);
 495
 496         if (IS_ERR(inode))
 497                 RETURN(PTR_ERR(inode));
 498
 499         /* no directory data updates when intents rule */
 500         if (it && it->it_disposition)
 501                 d_instantiate(dentry, inode);
 502         else
 503                 rc = ext2_add_nondir(dentry, inode);
 504
 505         return rc;
 506 }
 507
 508 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 509                       const char *symname)
 510 {
 511         struct lookup_intent *it;
 512         unsigned l = strlen(symname);
 513         struct inode *inode;
 514         struct ll_inode_info *lli;
 515         int err = 0;
 516         ENTRY;
 517
 518         CHECK_MOUNT_EPOCH(dir);
 519
 520         it = dentry->d_it;
 521
 522         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 523                                symname, l, S_IFLNK | S_IRWXUGO, 0, it, NULL);
 524         if (IS_ERR(inode))
 525                 RETURN(PTR_ERR(inode));
 526
 527         lli = ll_i2info(inode);
 528
 529         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 530         /* this _could_ be a non-fatal error, since the symlink is already
 531          * stored on the MDS by this point, and we can re-get it in readlink.
 532          */
 533         if (!lli->lli_symlink_name)
 534                 RETURN(-ENOMEM);
 535
 536         memcpy(lli->lli_symlink_name, symname, l + 1);
 537         inode->i_size = l;
 538
 539         /* no directory data updates when intents rule */
 540         if (it && it->it_disposition)
 541                 d_instantiate(dentry, inode);
 542         else
 543                 err = ext2_add_nondir(dentry, inode);
 544
 545         RETURN(err);
 546 }
 547
 548 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 549                    struct dentry *dentry)
 550 {
 551         struct lookup_intent *it;
 552         struct inode *inode = old_dentry->d_inode;
 553         int rc;
 554
 555         it = dentry->d_it;
 556
 557         if (it && it->it_disposition) {
 558                 if (it->it_status)
 559                         RETURN(it->it_status);
 560                 inode->i_ctime = CURRENT_TIME;
 561                 ext2_inc_count(inode);
 562                 atomic_inc(&inode->i_count);
 563                 d_instantiate(dentry, inode);
 564                 invalidate_inode_pages(dir);
 565                 RETURN(0);
 566         }
 567
 568         if (S_ISDIR(inode->i_mode))
 569                 return -EPERM;
 570
 571         if (inode->i_nlink >= EXT2_LINK_MAX)
 572                 return -EMLINK;
 573
 574         rc = ll_mdc_link(old_dentry, dir,
 575                           dentry->d_name.name, dentry->d_name.len);
 576         if (rc)
 577                 RETURN(rc);
 578
 579         inode->i_ctime = CURRENT_TIME;
 580         ext2_inc_count(inode);
 581         atomic_inc(&inode->i_count);
 582
 583         return ext2_add_nondir(dentry, inode);
 584 }
 585
 586 static int ll_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 587 {
 588         struct lookup_intent *it;
 589         struct inode * inode;
 590         int err = -EMLINK;
 591         ENTRY;
 592
 593         if (dir->i_nlink >= EXT2_LINK_MAX)
 594                 goto out;
 595
 596         ext2_inc_count(dir);
 597
 598         it = dentry->d_it;
 599
 600         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 601                                NULL, 0, S_IFDIR | mode, 0, it, NULL);
 602         err = PTR_ERR(inode);
 603         if (IS_ERR(inode))
 604                 goto out_dir;
 605
 606         ext2_inc_count(inode);
 607
 608         err = ext2_make_empty(inode, dir);
 609         if (err)
 610                 goto out_fail;
 611
 612         /* no directory data updates when intents rule */
 613         if (!it || !it->it_disposition) {
 614                 err = ll_add_link(dentry, inode);
 615                 if (err)
 616                         goto out_fail;
 617         }
 618
 619         d_instantiate(dentry, inode);
 620 out:
 621         EXIT;
 622         return err;
 623
 624 out_fail:
 625         ext2_dec_count(inode);
 626         ext2_dec_count(inode);
 627         iput(inode);
 628         EXIT;
 629 out_dir:
 630         ext2_dec_count(dir);
 631         EXIT;
 632         goto out;
 633 }
 634
 635 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 636                             struct lookup_intent *it, __u32 mode)
 637 {
 638         struct inode *inode = dentry->d_inode;
 639         struct ext2_dir_entry_2 * de;
 640         struct page * page;
 641         int rc;
 642
 643         if (it && it->it_disposition) {
 644                 rc = it->it_status;
 645                 invalidate_inode_pages(dir);
 646                 if (rc)
 647                         GOTO(out, rc);
 648                 GOTO(out_dec, 0);
 649         }
 650
 651         de = ext2_find_entry(dir, dentry, &page);
 652         if (!de)
 653                 GOTO(out, rc = -ENOENT);
 654         rc = ll_mdc_unlink(dir, dentry->d_inode, mode,
 655                            dentry->d_name.name, dentry->d_name.len);
 656         if (rc)
 657                 GOTO(out, rc);
 658
 659         rc = ext2_delete_entry(de, page);
 660         if (rc)
 661                 GOTO(out, rc);
 662
 663         /* AED: not sure if needed - directory lock revocation should do it
 664          * in the case where the client has cached it for non-intent ops.
 665          */
 666         invalidate_inode_pages(dir);
 667
 668         inode->i_ctime = dir->i_ctime;
 669 out_dec:
 670         ext2_dec_count(inode);
 671 out:
 672         return rc;
 673 }
 674
 675 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 676 {
 677         struct lookup_intent *it;
 678
 679         it = dentry->d_it;
 680
 681         return ll_common_unlink(dir, dentry, it, S_IFREG);
 682 }
 683
 684 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 685 {
 686         struct inode * inode = dentry->d_inode;
 687         struct lookup_intent *it;
 688         int rc;
 689         ENTRY;
 690
 691         it = dentry->d_it;
 692
 693         if ((!it || !it->it_disposition) && !ext2_empty_dir(inode))
 694                 RETURN(-ENOTEMPTY);
 695
 696         rc = ll_common_unlink(dir, dentry, it, S_IFDIR);
 697         if (!rc) {
 698                 inode->i_size = 0;
 699                 ext2_dec_count(inode);
 700                 ext2_dec_count(dir);
 701         }
 702
 703         RETURN(rc);
 704 }
 705
 706 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 707                      struct inode * new_dir, struct dentry * new_dentry)
 708 {
 709         struct lookup_intent *it;
 710         struct inode * old_inode = old_dentry->d_inode;
 711         struct inode * tgt_inode = new_dentry->d_inode;
 712         struct page * dir_page = NULL;
 713         struct ext2_dir_entry_2 * dir_de = NULL;
 714         struct ext2_dir_entry_2 * old_de;
 715         struct page * old_page;
 716         int err;
 717
 718         it = new_dentry->d_it;
 719
 720         if (it && it->it_disposition) {
 721                 if (tgt_inode) {
 722                         tgt_inode->i_ctime = CURRENT_TIME;
 723                         tgt_inode->i_nlink--;
 724                 }
 725                 invalidate_inode_pages(old_dir);
 726                 invalidate_inode_pages(new_dir);
 727                 GOTO(out, err = it->it_status);
 728         }
 729
 730         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 731         if (err)
 732                 goto out;
 733
 734         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 735         if (!old_de)
 736                 goto out;
 737
 738         if (S_ISDIR(old_inode->i_mode)) {
 739                 err = -EIO;
 740                 dir_de = ext2_dotdot(old_inode, &dir_page);
 741                 if (!dir_de)
 742                         goto out_old;
 743         }
 744
 745         if (tgt_inode) {
 746                 struct page *new_page;
 747                 struct ext2_dir_entry_2 *new_de;
 748
 749                 err = -ENOTEMPTY;
 750                 if (dir_de && !ext2_empty_dir (tgt_inode))
 751                         goto out_dir;
 752
 753                 err = -ENOENT;
 754                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 755                 if (!new_de)
 756                         goto out_dir;
 757                 ext2_inc_count(old_inode);
 758                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 759                 tgt_inode->i_ctime = CURRENT_TIME;
 760                 if (dir_de)
 761                         tgt_inode->i_nlink--;
 762                 ext2_dec_count(tgt_inode);
 763         } else {
 764                 if (dir_de) {
 765                         err = -EMLINK;
 766                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 767                                 goto out_dir;
 768                 }
 769                 ext2_inc_count(old_inode);
 770                 err = ll_add_link(new_dentry, old_inode);
 771                 if (err) {
 772                         ext2_dec_count(old_inode);
 773                         goto out_dir;
 774                 }
 775                 if (dir_de)
 776                         ext2_inc_count(new_dir);
 777         }
 778
 779         ext2_delete_entry (old_de, old_page);
 780         ext2_dec_count(old_inode);
 781
 782         if (dir_de) {
 783                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 784                 ext2_dec_count(old_dir);
 785         }
 786         return 0;
 787
 788 out_dir:
 789         if (dir_de) {
 790                 kunmap(dir_page);
 791                 page_cache_release(dir_page);
 792         }
 793 out_old:
 794         kunmap(old_page);
 795         page_cache_release(old_page);
 796 out:
 797         return err;
 798 }
 799
 800 struct inode_operations ll_dir_inode_operations = {
 801         create:         ll_create,
 802         lookup2:        ll_lookup2,
 803         link:           ll_link,
 804         unlink:         ll_unlink,
 805         symlink:        ll_symlink,
 806         mkdir:          ll_mkdir,
 807         rmdir:          ll_rmdir,
 808         mknod:          ll_mknod,
 809         rename:         ll_rename,
 810         setattr:        ll_setattr
 811 };