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         if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SETATTR | IT_MKNOD)))
 112                 lock_mode = LCK_PW;
 113         else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
 114                               IT_RMDIR | IT_RENAME | IT_RENAME2 | IT_READLINK|
 115                               IT_LINK | IT_LINK2))
 116                 lock_mode = LCK_PR;
 117         else if (it->it_op & IT_SYMLINK) {
 118                 lock_mode = LCK_PW;
 119                 tgt = it->it_data;
 120                 tgtlen = strlen(tgt);
 121                 it->it_data = NULL;
 122         } else if (it->it_op & IT_LOOKUP)
 123                 lock_mode = LCK_PR;
 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 err, offset;
 154         obd_id ino = 0;
 155
 156         ENTRY;
 157
 158         if (it == NULL) {
 159                 it = &lookup_it;
 160                 dentry->d_it = it;
 161         }
 162
 163         CDEBUG(D_INFO, "name: %*s, intent op: %d\n", dentry->d_name.len,
 164                dentry->d_name.name, it->it_op);
 165
 166         if (dentry->d_name.len > EXT2_NAME_LEN)
 167                 RETURN(ERR_PTR(-ENAMETOOLONG));
 168
 169         err = ll_lock(dir, dentry, it, &lockh);
 170         if (err < 0)
 171                 RETURN(ERR_PTR(err));
 172         memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
 173
 174         request = (struct ptlrpc_request *)it->it_data;
 175         if (it->it_disposition) {
 176                 int mode, symlen = 0;
 177                 obd_flag valid;
 178
 179                 offset = 1;
 180                 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 181                 ino = lic.lic_body->fid1.id;
 182                 mode = lic.lic_body->mode;
 183                 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
 184                         /* For create ops, we want the lookup to be negative */
 185                         if (!it->it_status)
 186                                 GOTO(negative, NULL);
 187                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP)) {
 188                         /* For check ops, we want the lookup to succeed */
 189                         it->it_data = NULL;
 190                         if (it->it_status)
 191                                 GOTO(neg_req, NULL);
 192                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 193                         /* For rename, we want the lookup to succeed */
 194                         if (it->it_status) {
 195                                 it->it_data = NULL;
 196                                 GOTO(neg_req, NULL);
 197                         }
 198                         it->it_data = dentry;
 199                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 200                         /* For remove ops, we want the lookup to succeed */
 201                         it->it_data = NULL;
 202                         if (it->it_status)
 203                                 GOTO(neg_req, NULL);
 204                         goto iget;
 205                 } else if (it->it_op == IT_OPEN) {
 206                         it->it_data = NULL;
 207                         if (it->it_status && it->it_status != -EEXIST)
 208                                 GOTO(neg_req, NULL);
 209                 } else if (it->it_op & (IT_RENAME2|IT_LINK2)) {
 210                         struct mds_body *body =
 211                                 lustre_msg_buf(request->rq_repmsg, offset);
 212                         it->it_data = NULL;
 213                         /* For rename2, this means the lookup is negative */
 214                         /* For link2 also */
 215                         if (body->valid == 0)
 216                                 GOTO(neg_req, NULL);
 217                         goto iget;
 218                 }
 219
 220                 /* Do a getattr now that we have the lock */
 221                 valid = OBD_MD_FLNOTOBD | OBD_MD_FLEASIZE;
 222                 if (it->it_op == IT_READLINK) {
 223                         valid |= OBD_MD_LINKNAME;
 224                         symlen = lic.lic_body->size;
 225                 }
 226                 ptlrpc_free_req(request);
 227                 request = NULL;
 228                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 229                                   valid, symlen, &request);
 230                 if (err) {
 231                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 232                         GOTO(drop_req, err = -abs(err));
 233                 }
 234                 offset = 0;
 235         } else {
 236                 struct ll_inode_info *lli = ll_i2info(dir);
 237                 int mode;
 238
 239                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 240                 offset = 0;
 241
 242                 ino = ll_inode_by_name(dir, dentry, &mode);
 243                 if (!ino) {
 244                         CERROR("inode %*s not found by name\n",
 245                                dentry->d_name.len, dentry->d_name.name);
 246                         GOTO(drop_lock, err = -ENOENT);
 247                 }
 248
 249                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 250                                   OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 251                 if (err) {
 252                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 253                         GOTO(drop_req, err = -abs(err));
 254                 }
 255         }
 256
 257  iget:
 258         lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 259         if (S_ISREG(lic.lic_body->mode) &&
 260             lic.lic_body->valid & OBD_MD_FLEASIZE) {
 261                 LASSERT(request->rq_repmsg->bufcount > offset);
 262                 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
 263         } else
 264                 lic.lic_lmm = NULL;
 265
 266         /* No rpc's happen during iget4, -ENOMEM's are possible */
 267         LASSERT(ino != 0);
 268         inode = iget4(dir->i_sb, ino, ll_find_inode, &lic);
 269
 270         if (!inode) {
 271                 ptlrpc_free_req(request);
 272                 ll_intent_release(dentry);
 273                 RETURN(ERR_PTR(-ENOMEM));
 274         }
 275
 276         EXIT;
 277  neg_req:
 278         ptlrpc_req_finished(request);
 279  negative:
 280         dentry->d_op = &ll_d_ops;
 281         d_add(dentry, inode);
 282         if (it->it_op == IT_LOOKUP)
 283                 ll_intent_release(dentry);
 284
 285         return NULL;
 286
 287  drop_req:
 288         ptlrpc_free_req(request);
 289  drop_lock:
 290 #warning FIXME: must release lock here
 291         return ERR_PTR(err);
 292 }
 293
 294 static struct inode *ll_create_node(struct inode *dir, const char *name,
 295                                     int namelen, const char *tgt, int tgtlen,
 296                                     int mode, __u64 extra,
 297                                     struct lookup_intent *it,
 298                                     struct lov_stripe_md *lsm)
 299 {
 300         struct inode *inode;
 301         struct ptlrpc_request *request = NULL;
 302         struct mds_body *body;
 303         int rc;
 304         time_t time = CURRENT_TIME;
 305         struct ll_sb_info *sbi = ll_i2sbi(dir);
 306         int gid = current->fsgid;
 307         struct ll_read_inode2_cookie lic;
 308         struct lov_mds_md *lmm = NULL;
 309         int mds_md_size = 0;
 310
 311         ENTRY;
 312
 313         if (dir->i_mode & S_ISGID) {
 314                 gid = dir->i_gid;
 315                 if (S_ISDIR(mode))
 316                         mode |= S_ISGID;
 317         }
 318
 319         if (!it || !it->it_disposition) {
 320                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 321                                  tgtlen, mode, current->fsuid,
 322                                  gid, time, extra, lsm, &request);
 323                 if (rc) {
 324                         inode = ERR_PTR(rc);
 325                         GOTO(out, rc);
 326                 }
 327                 body = lustre_msg_buf(request->rq_repmsg, 0);
 328                 if (lsm != NULL) {
 329                         mds_md_size = ll_mds_easize(dir->i_sb);
 330                         OBD_ALLOC(lmm, mds_md_size);
 331                         lov_packmd(lmm, lsm);
 332                         lic.lic_lmm = lmm;
 333                 } else
 334                         lic.lic_lmm = NULL;
 335
 336         } else {
 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         }
 342
 343         body->valid = OBD_MD_FLNOTOBD;
 344
 345         body->nlink = 1;
 346         body->atime = body->ctime = body->mtime = time;
 347         body->uid = current->fsuid;
 348         body->gid = gid;
 349         body->mode = mode;
 350
 351         lic.lic_body = body;
 352
 353         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 354         if (IS_ERR(inode)) {
 355                 rc = PTR_ERR(inode);
 356                 CERROR("new_inode -fatal: rc %d\n", rc);
 357                 LBUG();
 358                 GOTO(out, rc);
 359         }
 360
 361         if (!list_empty(&inode->i_dentry)) {
 362                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 363                        body->ino, atomic_read(&inode->i_count),
 364                        inode->i_nlink);
 365                 iput(inode);
 366                 LBUG();
 367                 inode = ERR_PTR(-EIO);
 368                 GOTO(out, -EIO);
 369         }
 370
 371         EXIT;
 372  out:
 373         if (lmm)
 374                 OBD_FREE(lmm, mds_md_size);
 375         ptlrpc_free_req(request);
 376         return inode;
 377 }
 378
 379 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 380                          const char *name, int len)
 381 {
 382         struct ptlrpc_request *request = NULL;
 383         struct ll_sb_info *sbi = ll_i2sbi(dir);
 384         int err;
 385
 386         ENTRY;
 387
 388         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 389                          &request);
 390         ptlrpc_free_req(request);
 391
 392         RETURN(err);
 393 }
 394
 395 int ll_mdc_link(struct dentry *src, struct inode *dir,
 396                 const char *name, int len)
 397 {
 398         struct ptlrpc_request *request = NULL;
 399         int err;
 400         struct ll_sb_info *sbi = ll_i2sbi(dir);
 401
 402         ENTRY;
 403
 404         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
 405                        len, &request);
 406         ptlrpc_free_req(request);
 407
 408         RETURN(err);
 409 }
 410
 411 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 412                   struct dentry *old, struct dentry *new)
 413 {
 414         struct ptlrpc_request *request = NULL;
 415         struct ll_sb_info *sbi = ll_i2sbi(src);
 416         int err;
 417
 418         ENTRY;
 419
 420         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 421                          old->d_name.name, old->d_name.len,
 422                          new->d_name.name, new->d_name.len, &request);
 423         ptlrpc_free_req(request);
 424
 425         RETURN(err);
 426 }
 427
 428 /*
 429  * By the time this is called, we already have created
 430  * the directory cache entry for the new file, but it
 431  * is so far negative - it has no inode.
 432  *
 433  * If the create succeeds, we fill in the inode information
 434  * with d_instantiate().
 435  */
 436
 437 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
 438 {
 439         int err, rc = 0;
 440         struct obdo oa;
 441         struct inode *inode;
 442         struct lov_stripe_md *lsm = NULL;
 443         struct ll_inode_info *lli = NULL;
 444         ENTRY;
 445
 446         if (dentry->d_it->it_disposition == 0) {
 447                 memset(&oa, 0, sizeof(oa));
 448                 oa.o_mode = S_IFREG | 0600;
 449                 oa.o_valid = OBD_MD_FLTYPE | OBD_MD_FLMODE;
 450                 rc = obd_create(ll_i2obdconn(dir), &oa, &lsm);
 451                 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld: rc = %d\n",
 452                        dentry->d_name.name, mode, (long long)oa.o_id, rc);
 453                 if (rc)
 454                         RETURN(rc);
 455         }
 456
 457         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 458                                NULL, 0, mode, 0, dentry->d_it, lsm);
 459
 460         if (IS_ERR(inode)) {
 461                 rc = PTR_ERR(inode);
 462                 CERROR("error creating MDS object for id %Ld: rc = %d\n",
 463                        (unsigned long long)oa.o_id, rc);
 464                 GOTO(out_destroy, rc);
 465         }
 466
 467         if (dentry->d_it->it_disposition) {
 468                 lli = ll_i2info(inode);
 469                 memcpy(&lli->lli_intent_lock_handle,
 470                        dentry->d_it->it_lock_handle,
 471                        sizeof(struct lustre_handle));
 472                 d_instantiate(dentry, inode);
 473         } else {
 474                 /* no directory data updates when intents rule */
 475                 rc = ext2_add_nondir(dentry, inode);
 476         }
 477
 478         RETURN(rc);
 479
 480 out_destroy:
 481         if (lsm) {
 482                 oa.o_easize = ll_mds_easize(inode->i_sb);
 483                 oa.o_valid |= OBD_MD_FLEASIZE;
 484                 err = obd_destroy(ll_i2obdconn(dir), &oa, lsm);
 485                 if (err)
 486                         CERROR("error destroying objid %Ld on error: err %d\n",
 487                        (unsigned long long)oa.o_id, err);
 488         }
 489
 490         return rc;
 491 }
 492
 493 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 494                     int rdev)
 495 {
 496         struct inode *inode;
 497         int err = 0;
 498
 499         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 500                                NULL, 0, mode, rdev, dentry->d_it, NULL);
 501
 502         if (IS_ERR(inode))
 503                 RETURN(PTR_ERR(inode));
 504
 505         /* no directory data updates when intents rule */
 506         if (dentry->d_it && dentry->d_it->it_disposition)
 507                 d_instantiate(dentry, inode);
 508         else
 509                 err = ext2_add_nondir(dentry, inode);
 510
 511         return err;
 512 }
 513
 514 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 515                       const char *symname)
 516 {
 517         unsigned l = strlen(symname);
 518         struct inode *inode;
 519         struct ll_inode_info *lli;
 520         int err = 0;
 521         ENTRY;
 522
 523         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 524                                symname, l, S_IFLNK | S_IRWXUGO, 0,
 525                                dentry->d_it, NULL);
 526         if (IS_ERR(inode))
 527                 RETURN(PTR_ERR(inode));
 528
 529         lli = ll_i2info(inode);
 530
 531         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 532         /* this _could_ be a non-fatal error, since the symlink is already
 533          * stored on the MDS by this point, and we can re-get it in readlink.
 534          */
 535         if (!lli->lli_symlink_name)
 536                 RETURN(-ENOMEM);
 537
 538         memcpy(lli->lli_symlink_name, symname, l + 1);
 539         inode->i_size = l;
 540
 541         /* no directory data updates when intents rule */
 542         if (dentry->d_it && dentry->d_it->it_disposition)
 543                 d_instantiate(dentry, inode);
 544         else
 545                 err = ext2_add_nondir(dentry, inode);
 546
 547         RETURN(err);
 548 }
 549
 550 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 551                    struct dentry *dentry)
 552 {
 553         int err;
 554         struct inode *inode = old_dentry->d_inode;
 555
 556         if (dentry->d_it && dentry->d_it->it_disposition) {
 557                 int err = dentry->d_it->it_status;
 558                 if (err)
 559                         RETURN(err);
 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(err);
 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         err = ll_mdc_link(old_dentry, dir,
 575                           dentry->d_name.name, dentry->d_name.len);
 576         if (err)
 577                 RETURN(err);
 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 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         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 598                                NULL, 0, S_IFDIR | mode, 0, dentry->d_it, NULL);
 599         err = PTR_ERR(inode);
 600         if (IS_ERR(inode))
 601                 goto out_dir;
 602
 603         ext2_inc_count(inode);
 604
 605         err = ext2_make_empty(inode, dir);
 606         if (err)
 607                 goto out_fail;
 608
 609         /* no directory data updates when intents rule */
 610         if (dentry->d_it->it_disposition == 0) {
 611                 err = ll_add_link(dentry, inode);
 612                 if (err)
 613                         goto out_fail;
 614         }
 615
 616         d_instantiate(dentry, inode);
 617 out:
 618         EXIT;
 619         return err;
 620
 621 out_fail:
 622         ext2_dec_count(inode);
 623         ext2_dec_count(inode);
 624         iput(inode);
 625         EXIT;
 626 out_dir:
 627         ext2_dec_count(dir);
 628         EXIT;
 629         goto out;
 630 }
 631
 632 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 633                             __u32 mode)
 634 {
 635         struct inode * inode = dentry->d_inode;
 636 #if 0
 637         struct ext2_dir_entry_2 * de;
 638         struct page * page;
 639 #endif
 640         int err = -ENOENT;
 641
 642         if (dentry->d_it && dentry->d_it->it_disposition) {
 643                 err = dentry->d_it->it_status;
 644                 invalidate_inode_pages(dir);
 645                 GOTO(out, err);
 646         }
 647
 648 #if 0
 649         de = ext2_find_entry(dir, dentry, &page);
 650         if (!de)
 651                 goto out;
 652 #endif
 653         err = ll_mdc_unlink(dir, dentry->d_inode, mode,
 654                             dentry->d_name.name, dentry->d_name.len);
 655         if (err)
 656                 goto out;
 657
 658 #if 0
 659         err = ext2_delete_entry(de, page);
 660         if (err)
 661                 goto out;
 662 #endif
 663         invalidate_inode_pages(dir);
 664
 665         inode->i_ctime = dir->i_ctime;
 666 out:
 667         ext2_dec_count(inode);
 668         return err;
 669 }
 670
 671 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 672 {
 673         return ll_common_unlink(dir, dentry, S_IFREG);
 674 }
 675
 676 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 677 {
 678         struct inode * inode = dentry->d_inode;
 679         int err = 0;
 680         ENTRY;
 681
 682         if (!dentry->d_it || dentry->d_it->it_disposition == 0) {
 683                 if (!ext2_empty_dir(inode))
 684                         LBUG();
 685                 err = ll_common_unlink(dir, dentry, S_IFDIR);
 686         } else
 687                 err = dentry->d_it->it_status;
 688         if (err)
 689                 RETURN(err);
 690         inode->i_size = 0;
 691         ext2_dec_count(inode);
 692         ext2_dec_count(dir);
 693         RETURN(err);
 694 }
 695
 696 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 697                      struct inode * new_dir, struct dentry * new_dentry)
 698 {
 699         struct inode * old_inode = old_dentry->d_inode;
 700         struct inode * tgt_inode = new_dentry->d_inode;
 701         struct page * dir_page = NULL;
 702         struct ext2_dir_entry_2 * dir_de = NULL;
 703         struct ext2_dir_entry_2 * old_de;
 704         struct page * old_page;
 705         int err = -ENOENT;
 706
 707         if (new_dentry->d_it && new_dentry->d_it->it_disposition) {
 708                 if (tgt_inode) {
 709                         tgt_inode->i_ctime = CURRENT_TIME;
 710                         tgt_inode->i_nlink--;
 711                 }
 712                 invalidate_inode_pages(old_dir);
 713                 invalidate_inode_pages(new_dir);
 714                 GOTO(out, err = new_dentry->d_it->it_status);
 715         }
 716
 717         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 718         if (err)
 719                 goto out;
 720
 721         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 722         if (!old_de)
 723                 goto out;
 724
 725         if (S_ISDIR(old_inode->i_mode)) {
 726                 err = -EIO;
 727                 dir_de = ext2_dotdot(old_inode, &dir_page);
 728                 if (!dir_de)
 729                         goto out_old;
 730         }
 731
 732         if (tgt_inode) {
 733                 struct page *new_page;
 734                 struct ext2_dir_entry_2 *new_de;
 735
 736                 err = -ENOTEMPTY;
 737                 if (dir_de && !ext2_empty_dir (tgt_inode))
 738                         goto out_dir;
 739
 740                 err = -ENOENT;
 741                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 742                 if (!new_de)
 743                         goto out_dir;
 744                 ext2_inc_count(old_inode);
 745                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 746                 tgt_inode->i_ctime = CURRENT_TIME;
 747                 if (dir_de)
 748                         tgt_inode->i_nlink--;
 749                 ext2_dec_count(tgt_inode);
 750         } else {
 751                 if (dir_de) {
 752                         err = -EMLINK;
 753                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 754                                 goto out_dir;
 755                 }
 756                 ext2_inc_count(old_inode);
 757                 err = ll_add_link(new_dentry, old_inode);
 758                 if (err) {
 759                         ext2_dec_count(old_inode);
 760                         goto out_dir;
 761                 }
 762                 if (dir_de)
 763                         ext2_inc_count(new_dir);
 764         }
 765
 766         ext2_delete_entry (old_de, old_page);
 767         ext2_dec_count(old_inode);
 768
 769         if (dir_de) {
 770                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 771                 ext2_dec_count(old_dir);
 772         }
 773         return 0;
 774
 775 out_dir:
 776         if (dir_de) {
 777                 kunmap(dir_page);
 778                 page_cache_release(dir_page);
 779         }
 780 out_old:
 781         kunmap(old_page);
 782         page_cache_release(old_page);
 783 out:
 784         return err;
 785 }
 786
 787 struct inode_operations ll_dir_inode_operations = {
 788         create:         ll_create,
 789         lookup2:        ll_lookup2,
 790         link:           ll_link,
 791         unlink:         ll_unlink,
 792         symlink:        ll_symlink,
 793         mkdir:          ll_mkdir,
 794         rmdir:          ll_rmdir,
 795         mknod:          ll_mknod,
 796         rename:         ll_rename,
 797         setattr:        ll_setattr
 798 };