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 static int ll_find_inode(struct inode *inode, unsigned long ino, void *opaque)
  92 {
  93         struct ll_read_inode2_cookie *lic = opaque;
  94         struct mds_body *body = lic->lic_body;
  95
  96         if (inode->i_generation != lic->lic_body->generation)
  97                 return 0;
  98
  99         /* Apply the attributes in 'opaque' to this inode */
 100         ll_update_inode(inode, body);
 101
 102         return 1;
 103 }
 104
 105 extern struct dentry_operations ll_d_ops;
 106
 107 int ll_lock(struct inode *dir, struct dentry *dentry,
 108             struct lookup_intent *it, struct lustre_handle *lockh)
 109 {
 110         struct ll_sb_info *sbi = ll_i2sbi(dir);
 111         char *tgt = NULL;
 112         int tgtlen = 0;
 113         int err, lock_mode;
 114
 115         /* CREAT needs to be tested before open (both could be set) */
 116         if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SETATTR | IT_MKNOD))) {
 117                 lock_mode = LCK_PW;
 118         } else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
 119                                 IT_RMDIR | IT_RENAME | IT_RENAME2 | IT_READLINK|
 120                                 IT_LINK | IT_LINK2 | IT_LOOKUP)) {
 121                 /* XXXphil PW for LINK2/RENAME2? */
 122                 lock_mode = LCK_PR;
 123         } else if (it->it_op & IT_SYMLINK) {
 124                 lock_mode = LCK_PW;
 125                 tgt = it->it_data;
 126                 tgtlen = strlen(tgt);
 127                 it->it_data = NULL;
 128         } else {
 129                 LBUG();
 130                 RETURN(-EINVAL);
 131         }
 132
 133         err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT, it, lock_mode,
 134                           dir, dentry, lockh, tgt, tgtlen, dir, sizeof(*dir));
 135
 136         RETURN(err);
 137 }
 138
 139 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
 140 {
 141         ENTRY;
 142
 143         ldlm_lock_decref(lockh, mode);
 144
 145         RETURN(0);
 146 }
 147
 148 static struct dentry *ll_lookup2(struct inode *dir, struct dentry *dentry,
 149                                  struct lookup_intent *it)
 150 {
 151         struct ptlrpc_request *request = NULL;
 152         struct inode * inode = NULL;
 153         struct ll_sb_info *sbi = ll_i2sbi(dir);
 154         struct ll_read_inode2_cookie lic;
 155         struct lustre_handle lockh;
 156         struct lookup_intent lookup_it = { IT_LOOKUP };
 157         int rc, offset;
 158         obd_id ino = 0;
 159
 160         ENTRY;
 161
 162         /* CHECK_MOUNT_EPOCH(dir); */
 163         if (ll_i2info(dir)->lli_mount_epoch != ll_i2sbi(dir)->ll_mount_epoch) {
 164                 make_bad_inode(dir);
 165                 RETURN(ERR_PTR(-EIO));
 166         }
 167
 168         if (it == NULL)
 169                 it = &lookup_it;
 170
 171         CDEBUG(D_INFO, "name: %*s, intent: %s\n", dentry->d_name.len,
 172                dentry->d_name.name, ldlm_it2str(it->it_op));
 173
 174         if (dentry->d_name.len > EXT2_NAME_LEN)
 175                 RETURN(ERR_PTR(-ENAMETOOLONG));
 176
 177         rc = ll_lock(dir, dentry, it, &lockh);
 178         if (rc < 0)
 179                 RETURN(ERR_PTR(rc));
 180         memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
 181
 182         request = (struct ptlrpc_request *)it->it_data;
 183         if (it->it_disposition) {
 184                 int mode, symlen = 0;
 185                 obd_flag valid;
 186
 187                 offset = 1;
 188                 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 189                 ino = lic.lic_body->fid1.id;
 190                 mode = lic.lic_body->mode;
 191                 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
 192                         /* For create ops, we want the lookup to be negative,
 193                          * unless the create failed in a way that indicates
 194                          * that the file is already there */
 195                         if (it->it_status != -EEXIST)
 196                                 GOTO(negative, NULL);
 197                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP |
 198                                         IT_READLINK)) {
 199                         /* For check ops, we want the lookup to succeed */
 200                         it->it_data = NULL;
 201                         if (it->it_status)
 202                                 GOTO(neg_req, NULL);
 203                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 204                         /* For rename, we want the source lookup to succeed */
 205                         if (it->it_status) {
 206                                 it->it_data = NULL;
 207                                 GOTO(drop_req, rc = it->it_status);
 208                         }
 209                         it->it_data = dentry;
 210                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 211                         /* For remove ops, we want the lookup to succeed unless
 212                          * the file truly doesn't exist */
 213                         it->it_data = NULL;
 214                         if (it->it_status == -ENOENT)
 215                                 GOTO(neg_req, NULL);
 216                         goto iget;
 217                 } else if (it->it_op == IT_OPEN) {
 218                         it->it_data = NULL;
 219                         if (it->it_status && it->it_status != -EEXIST)
 220                                 GOTO(neg_req, NULL);
 221                 } else if (it->it_op & (IT_RENAME2 | IT_LINK2)) {
 222                         struct mds_body *body =
 223                                 lustre_msg_buf(request->rq_repmsg, offset);
 224                         it->it_data = NULL;
 225                         /* This means the target lookup is negative */
 226                         if (body->valid == 0)
 227                                 GOTO(neg_req, NULL);
 228                         goto iget;
 229                 }
 230
 231                 /* Do a getattr now that we have the lock */
 232                 valid = OBD_MD_FLNOTOBD | OBD_MD_FLEASIZE;
 233                 if (it->it_op == IT_READLINK) {
 234                         valid |= OBD_MD_LINKNAME;
 235                         symlen = lic.lic_body->size;
 236                 }
 237                 ptlrpc_req_finished(request);
 238                 request = NULL;
 239                 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 240                                  valid, symlen, &request);
 241                 if (rc) {
 242                         CERROR("failure %d inode "LPX64"\n", rc, ino);
 243                         GOTO(drop_req, rc = -abs(rc));
 244                 }
 245                 offset = 0;
 246         } else {
 247                 struct ll_inode_info *lli = ll_i2info(dir);
 248                 int mode;
 249
 250                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 251                 offset = 0;
 252
 253                 ino = ll_inode_by_name(dir, dentry, &mode);
 254                 if (!ino) {
 255                         CERROR("inode %*s not found by name\n",
 256                                dentry->d_name.len, dentry->d_name.name);
 257                         GOTO(drop_lock, rc = -ENOENT);
 258                 }
 259
 260                 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 261                                  OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 262                 if (rc) {
 263                         CERROR("failure %d inode "LPX64"\n", rc, ino);
 264                         GOTO(drop_req, rc = -abs(rc));
 265                 }
 266         }
 267
 268  iget:
 269         lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 270         if (S_ISREG(lic.lic_body->mode) &&
 271             lic.lic_body->valid & OBD_MD_FLEASIZE) {
 272                 LASSERT(request->rq_repmsg->bufcount > offset);
 273                 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
 274         } else
 275                 lic.lic_lmm = NULL;
 276
 277         /* No rpc's happen during iget4, -ENOMEM's are possible */
 278         LASSERT(ino != 0);
 279         inode = iget4(dir->i_sb, ino, ll_find_inode, &lic);
 280
 281         if (!inode) {
 282                 ptlrpc_free_req(request);
 283                 ll_intent_release(dentry, it);
 284                 RETURN(ERR_PTR(-ENOMEM));
 285         }
 286
 287         EXIT;
 288  neg_req:
 289         ptlrpc_req_finished(request);
 290  negative:
 291         dentry->d_op = &ll_d_ops;
 292         if (ll_d2d(dentry) == NULL) {
 293                 ll_set_dd(dentry);
 294         } else
 295                 CERROR("NOT allocating fsdata - already set\n");
 296
 297         d_add(dentry, inode);
 298
 299         if (it->it_status == 0) {
 300                 LL_SAVE_INTENT(dentry, it);
 301         }
 302         else {
 303                 dentry->d_it = NULL;
 304                 CDEBUG(D_DENTRY,
 305                        "D_IT dentry %p fsdata %p intent: %s status %d\n",
 306                        dentry, ll_d2d(dentry), ldlm_it2str(it->it_op),
 307                        it->it_status);
 308         }
 309
 310         if (it->it_op == IT_LOOKUP)
 311                 ll_intent_release(dentry, it);
 312
 313         return NULL;
 314
 315  drop_req:
 316         ptlrpc_free_req(request);
 317  drop_lock:
 318 #warning FIXME: must release lock here
 319         return ERR_PTR(rc);
 320 }
 321
 322 static struct inode *ll_create_node(struct inode *dir, const char *name,
 323                                     int namelen, const char *tgt, int tgtlen,
 324                                     int mode, __u64 extra,
 325                                     struct lookup_intent *it,
 326                                     struct lov_stripe_md *lsm)
 327 {
 328         struct inode *inode;
 329         struct ptlrpc_request *request = NULL;
 330         struct mds_body *body;
 331         time_t time = CURRENT_TIME;
 332         struct ll_sb_info *sbi = ll_i2sbi(dir);
 333         struct ll_read_inode2_cookie lic;
 334         struct lov_mds_md *lmm = NULL;
 335         ENTRY;
 336
 337         if (it && it->it_disposition) {
 338                 int rc = it->it_status;
 339                 if (rc) {
 340                         CERROR("error creating MDS inode for %*s: rc = %d\n",
 341                                namelen, name, rc);
 342                         RETURN(ERR_PTR(rc));
 343                 }
 344                 invalidate_inode_pages(dir);
 345                 request = it->it_data;
 346                 body = lustre_msg_buf(request->rq_repmsg, 1);
 347                 lic.lic_lmm = NULL;
 348         } else {
 349                 int gid = current->fsgid;
 350                 int rc;
 351
 352                 if (lsm) {
 353                         OBD_ALLOC(lmm, lsm->lsm_mds_easize);
 354                         if (!lmm)
 355                                 RETURN(ERR_PTR(-ENOMEM));
 356                         lov_packmd(lmm, lsm);
 357                         lic.lic_lmm = lmm;
 358                 } else
 359                         lic.lic_lmm = NULL;
 360
 361                 if (dir->i_mode & S_ISGID) {
 362                         gid = dir->i_gid;
 363                         if (S_ISDIR(mode))
 364                                 mode |= S_ISGID;
 365                 }
 366
 367                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 368                                 tgtlen, mode, current->fsuid, gid,
 369                                 time, extra, lsm, &request);
 370                 if (rc) {
 371                         inode = ERR_PTR(rc);
 372                         GOTO(out, rc);
 373                 }
 374                 body = lustre_msg_buf(request->rq_repmsg, 0);
 375         }
 376
 377         lic.lic_body = body;
 378
 379         LASSERT(body->ino != 0);
 380         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 381         if (IS_ERR(inode)) {
 382                 int rc = PTR_ERR(inode);
 383                 CERROR("new_inode -fatal: rc %d\n", rc);
 384                 LBUG();
 385                 GOTO(out, rc);
 386         }
 387
 388         if (!list_empty(&inode->i_dentry)) {
 389                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 390                        body->ino, atomic_read(&inode->i_count),
 391                        inode->i_nlink);
 392                 iput(inode);
 393                 LBUG();
 394                 inode = ERR_PTR(-EIO);
 395                 GOTO(out, -EIO);
 396         }
 397
 398         EXIT;
 399  out:
 400         if (lsm && lmm)
 401                 OBD_FREE(lmm, lsm->lsm_mds_easize);
 402         ptlrpc_req_finished(request);
 403         return inode;
 404 }
 405
 406 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 407                          const char *name, int len)
 408 {
 409         struct ptlrpc_request *request = NULL;
 410         struct ll_sb_info *sbi = ll_i2sbi(dir);
 411         int err;
 412
 413         ENTRY;
 414
 415         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 416                          &request);
 417         ptlrpc_req_finished(request);
 418
 419         RETURN(err);
 420 }
 421
 422 int ll_mdc_link(struct dentry *src, struct inode *dir,
 423                 const char *name, int len)
 424 {
 425         struct ptlrpc_request *request = NULL;
 426         int err;
 427         struct ll_sb_info *sbi = ll_i2sbi(dir);
 428
 429         ENTRY;
 430
 431         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name, len, &request);
 432         ptlrpc_req_finished(request);
 433
 434         RETURN(err);
 435 }
 436
 437 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 438                   struct dentry *old, struct dentry *new)
 439 {
 440         struct ptlrpc_request *request = NULL;
 441         struct ll_sb_info *sbi = ll_i2sbi(src);
 442         int err;
 443
 444         ENTRY;
 445
 446         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 447                          old->d_name.name, old->d_name.len,
 448                          new->d_name.name, new->d_name.len, &request);
 449         ptlrpc_req_finished(request);
 450
 451         RETURN(err);
 452 }
 453
 454 /*
 455  * By the time this is called, we already have created the directory cache
 456  * entry for the new file, but it is so far negative - it has no inode.
 457  * We defer creating the OBD object(s) until open, to keep the intent and
 458  * non-intent code paths similar, and also because we do not have the MDS
 459  * inode number before calling ll_create_node() (which is needed for LOV),
 460  * so we would need to do yet another RPC to the MDS to store the LOV EA
 461  * data on the MDS.
 462  *
 463  * If the create succeeds, we fill in the inode information
 464  * with d_instantiate().
 465  */
 466 static int ll_create(struct inode *dir, struct dentry *dentry, int mode)
 467 {
 468         struct lookup_intent *it;
 469         struct inode *inode;
 470         int rc = 0;
 471         ENTRY;
 472
 473         CHECK_MOUNT_EPOCH(dir);
 474
 475         LL_GET_INTENT(dentry, it);
 476
 477         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 478                                NULL, 0, mode, 0, it, NULL);
 479
 480         if (IS_ERR(inode))
 481                 RETURN(PTR_ERR(inode));
 482
 483         if (it->it_disposition) {
 484                 struct ll_inode_info *lli = ll_i2info(inode);
 485                 memcpy(&lli->lli_intent_lock_handle, it->it_lock_handle,
 486                        sizeof(lli->lli_intent_lock_handle));
 487                 d_instantiate(dentry, inode);
 488         } else {
 489                 /* no directory data updates when intents rule */
 490                 rc = ext2_add_nondir(dentry, inode);
 491         }
 492
 493         RETURN(rc);
 494 }
 495
 496 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 497                     int rdev)
 498 {
 499         struct lookup_intent *it;
 500         struct inode *inode;
 501         int rc = 0;
 502
 503         LL_GET_INTENT(dentry, it);
 504
 505         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 506                                NULL, 0, mode, rdev, it, NULL);
 507
 508         if (IS_ERR(inode))
 509                 RETURN(PTR_ERR(inode));
 510
 511         /* no directory data updates when intents rule */
 512         if (it && it->it_disposition)
 513                 d_instantiate(dentry, inode);
 514         else
 515                 rc = ext2_add_nondir(dentry, inode);
 516
 517         return rc;
 518 }
 519
 520 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 521                       const char *symname)
 522 {
 523         struct lookup_intent *it;
 524         unsigned l = strlen(symname);
 525         struct inode *inode;
 526         struct ll_inode_info *lli;
 527         int err = 0;
 528         ENTRY;
 529
 530         CHECK_MOUNT_EPOCH(dir);
 531
 532         LL_GET_INTENT(dentry, it);
 533
 534         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 535                                symname, l, S_IFLNK | S_IRWXUGO, 0, it, NULL);
 536         if (IS_ERR(inode))
 537                 RETURN(PTR_ERR(inode));
 538
 539         lli = ll_i2info(inode);
 540
 541         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 542         /* this _could_ be a non-fatal error, since the symlink is already
 543          * stored on the MDS by this point, and we can re-get it in readlink.
 544          */
 545         if (!lli->lli_symlink_name)
 546                 RETURN(-ENOMEM);
 547
 548         memcpy(lli->lli_symlink_name, symname, l + 1);
 549         inode->i_size = l;
 550
 551         /* no directory data updates when intents rule */
 552         if (it && it->it_disposition)
 553                 d_instantiate(dentry, inode);
 554         else
 555                 err = ext2_add_nondir(dentry, inode);
 556
 557         RETURN(err);
 558 }
 559
 560 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 561                    struct dentry *dentry)
 562 {
 563         struct lookup_intent *it;
 564         struct inode *inode = old_dentry->d_inode;
 565         int rc;
 566
 567         LL_GET_INTENT(dentry, it);
 568
 569         if (it && it->it_disposition) {
 570                 if (it->it_status)
 571                         RETURN(it->it_status);
 572                 inode->i_ctime = CURRENT_TIME;
 573                 ext2_inc_count(inode);
 574                 atomic_inc(&inode->i_count);
 575                 d_instantiate(dentry, inode);
 576                 invalidate_inode_pages(dir);
 577                 RETURN(0);
 578         }
 579
 580         if (S_ISDIR(inode->i_mode))
 581                 return -EPERM;
 582
 583         if (inode->i_nlink >= EXT2_LINK_MAX)
 584                 return -EMLINK;
 585
 586         rc = ll_mdc_link(old_dentry, dir,
 587                           dentry->d_name.name, dentry->d_name.len);
 588         if (rc)
 589                 RETURN(rc);
 590
 591         inode->i_ctime = CURRENT_TIME;
 592         ext2_inc_count(inode);
 593         atomic_inc(&inode->i_count);
 594
 595         return ext2_add_nondir(dentry, inode);
 596 }
 597
 598 static int ll_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 599 {
 600         struct lookup_intent *it;
 601         struct inode * inode;
 602         int err = -EMLINK;
 603         ENTRY;
 604
 605         LL_GET_INTENT(dentry, it);
 606
 607         if (dir->i_nlink >= EXT2_LINK_MAX)
 608                 goto out;
 609
 610         ext2_inc_count(dir);
 611         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 612                                NULL, 0, S_IFDIR | mode, 0, it, NULL);
 613         err = PTR_ERR(inode);
 614         if (IS_ERR(inode))
 615                 goto out_dir;
 616
 617         ext2_inc_count(inode);
 618
 619         err = ext2_make_empty(inode, dir);
 620         if (err)
 621                 goto out_fail;
 622
 623         /* no directory data updates when intents rule */
 624         if (!it || !it->it_disposition) {
 625                 err = ll_add_link(dentry, inode);
 626                 if (err)
 627                         goto out_fail;
 628         }
 629
 630         d_instantiate(dentry, inode);
 631 out:
 632         EXIT;
 633         return err;
 634
 635 out_fail:
 636         ext2_dec_count(inode);
 637         ext2_dec_count(inode);
 638         iput(inode);
 639         EXIT;
 640 out_dir:
 641         ext2_dec_count(dir);
 642         EXIT;
 643         goto out;
 644 }
 645
 646 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 647                             struct lookup_intent *it, __u32 mode)
 648 {
 649         struct inode *inode = dentry->d_inode;
 650         struct ext2_dir_entry_2 * de;
 651         struct page * page;
 652         int rc = 0;
 653
 654         if (it && it->it_disposition) {
 655                 rc = it->it_status;
 656                 invalidate_inode_pages(dir);
 657                 if (rc)
 658                         GOTO(out, rc);
 659                 GOTO(out_dec, 0);
 660         }
 661
 662         de = ext2_find_entry(dir, dentry, &page);
 663         if (!de)
 664                 GOTO(out, rc = -ENOENT);
 665         rc = ll_mdc_unlink(dir, dentry->d_inode, mode,
 666                            dentry->d_name.name, dentry->d_name.len);
 667         if (rc)
 668                 GOTO(out, rc);
 669
 670         rc = ext2_delete_entry(de, page);
 671         if (rc)
 672                 GOTO(out, rc);
 673
 674         /* AED: not sure if needed - directory lock revocation should do it
 675          * in the case where the client has cached it for non-intent ops.
 676          */
 677         invalidate_inode_pages(dir);
 678
 679         inode->i_ctime = dir->i_ctime;
 680 out_dec:
 681         ext2_dec_count(inode);
 682 out:
 683         return rc;
 684 }
 685
 686 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 687 {
 688         struct lookup_intent * it;
 689
 690         LL_GET_INTENT(dentry, it);
 691
 692         return ll_common_unlink(dir, dentry, it, S_IFREG);
 693 }
 694
 695 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 696 {
 697         struct inode * inode = dentry->d_inode;
 698         struct lookup_intent *it;
 699         int rc;
 700         ENTRY;
 701
 702         LL_GET_INTENT(dentry, it);
 703
 704
 705         if ((!it || !it->it_disposition) && !ext2_empty_dir(inode))
 706                 RETURN(-ENOTEMPTY);
 707
 708         rc = ll_common_unlink(dir, dentry, it, S_IFDIR);
 709         if (!rc) {
 710                 inode->i_size = 0;
 711                 ext2_dec_count(inode);
 712                 ext2_dec_count(dir);
 713         }
 714
 715         RETURN(rc);
 716 }
 717
 718 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 719                      struct inode * new_dir, struct dentry * new_dentry)
 720 {
 721         struct lookup_intent *it;
 722         struct inode * old_inode = old_dentry->d_inode;
 723         struct inode * tgt_inode = new_dentry->d_inode;
 724         struct page * dir_page = NULL;
 725         struct ext2_dir_entry_2 * dir_de = NULL;
 726         struct ext2_dir_entry_2 * old_de;
 727         struct page * old_page;
 728         int err;
 729
 730         LL_GET_INTENT(new_dentry, it);
 731
 732         if (it && it->it_disposition) {
 733                 if (tgt_inode) {
 734                         tgt_inode->i_ctime = CURRENT_TIME;
 735                         tgt_inode->i_nlink--;
 736                 }
 737                 invalidate_inode_pages(old_dir);
 738                 invalidate_inode_pages(new_dir);
 739                 GOTO(out, err = it->it_status);
 740         }
 741
 742         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 743         if (err)
 744                 goto out;
 745
 746         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 747         if (!old_de)
 748                 goto out;
 749
 750         if (S_ISDIR(old_inode->i_mode)) {
 751                 err = -EIO;
 752                 dir_de = ext2_dotdot(old_inode, &dir_page);
 753                 if (!dir_de)
 754                         goto out_old;
 755         }
 756
 757         if (tgt_inode) {
 758                 struct page *new_page;
 759                 struct ext2_dir_entry_2 *new_de;
 760
 761                 err = -ENOTEMPTY;
 762                 if (dir_de && !ext2_empty_dir (tgt_inode))
 763                         goto out_dir;
 764
 765                 err = -ENOENT;
 766                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 767                 if (!new_de)
 768                         goto out_dir;
 769                 ext2_inc_count(old_inode);
 770                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 771                 tgt_inode->i_ctime = CURRENT_TIME;
 772                 if (dir_de)
 773                         tgt_inode->i_nlink--;
 774                 ext2_dec_count(tgt_inode);
 775         } else {
 776                 if (dir_de) {
 777                         err = -EMLINK;
 778                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 779                                 goto out_dir;
 780                 }
 781                 ext2_inc_count(old_inode);
 782                 err = ll_add_link(new_dentry, old_inode);
 783                 if (err) {
 784                         ext2_dec_count(old_inode);
 785                         goto out_dir;
 786                 }
 787                 if (dir_de)
 788                         ext2_inc_count(new_dir);
 789         }
 790
 791         ext2_delete_entry (old_de, old_page);
 792         ext2_dec_count(old_inode);
 793
 794         if (dir_de) {
 795                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 796                 ext2_dec_count(old_dir);
 797         }
 798         return 0;
 799
 800 out_dir:
 801         if (dir_de) {
 802                 kunmap(dir_page);
 803                 page_cache_release(dir_page);
 804         }
 805 out_old:
 806         kunmap(old_page);
 807         page_cache_release(old_page);
 808 out:
 809         return err;
 810 }
 811
 812 struct inode_operations ll_dir_inode_operations = {
 813         create:         ll_create,
 814         lookup2:        ll_lookup2,
 815         link:           ll_link,
 816         unlink:         ll_unlink,
 817         symlink:        ll_symlink,
 818         mkdir:          ll_mkdir,
 819         rmdir:          ll_rmdir,
 820         mknod:          ll_mknod,
 821         rename:         ll_rename,
 822         setattr:        ll_setattr
 823 };