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                 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
 181                         /* For create ops, we want the lookup to be negative */
 182                         if (!it->it_status)
 183                                 GOTO(negative, NULL);
 184                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP)) {
 185                         /* For check ops, we want the lookup to succeed */
 186                         it->it_data = NULL;
 187                         if (it->it_status)
 188                                 GOTO(neg_req, NULL);
 189                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 190                         /* For rename, we want the lookup to succeed */
 191                         if (it->it_status) {
 192                                 it->it_data = NULL;
 193                                 GOTO(neg_req, NULL);
 194                         }
 195                         it->it_data = dentry;
 196                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 197                         /* For remove ops, we want the lookup to succeed */
 198                         it->it_data = NULL;
 199                         if (it->it_status)
 200                                 GOTO(neg_req, NULL);
 201                         goto iget;
 202                 } else if (it->it_op == IT_OPEN) {
 203                         it->it_data = NULL;
 204                         if (it->it_status && it->it_status != -EEXIST)
 205                                 GOTO(neg_req, NULL);
 206                 } else if (it->it_op & (IT_RENAME2|IT_LINK2)) {
 207                         struct mds_body *body =
 208                                 lustre_msg_buf(request->rq_repmsg, offset);
 209                         it->it_data = NULL;
 210                         /* For rename2, this means the lookup is negative */
 211                         /* For link2 also */
 212                         if (body->valid == 0)
 213                                 GOTO(neg_req, NULL);
 214                         goto iget; /* XXX not sure about this */
 215                 }
 216
 217                 /* Do a getattr now that we have the lock */
 218                 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 219                 ino = lic.lic_body->fid1.id;
 220                 mode = lic.lic_body->mode;
 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                         ptlrpc_free_req(request);
 233 #warning FIXME: must release lock here
 234                         RETURN(ERR_PTR(-abs(err)));
 235                 }
 236                 offset = 0;
 237         } else {
 238                 struct ll_inode_info *lli = ll_i2info(dir);
 239                 int type;
 240
 241                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 242                 offset = 0;
 243
 244                 ino = ll_inode_by_name(dir, dentry, &type);
 245 #warning FIXME: handle negative inode case (see old ll_lookup)
 246
 247                 err = mdc_getattr(&sbi->ll_mdc_conn, ino, type,
 248                                   OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 249                 if (err) {
 250                         CERROR("failure %d inode %Ld\n", err, (long long)ino);
 251                         ptlrpc_free_req(request);
 252 #warning FIXME: must release lock here
 253                         RETURN(ERR_PTR(-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         inode = iget4(dir->i_sb, ino, ll_find_inode, &lic);
 268
 269         LASSERT(!IS_ERR(inode));
 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
 288 static struct inode *ll_create_node(struct inode *dir, const char *name,
 289                                     int namelen, const char *tgt, int tgtlen,
 290                                     int mode, __u64 extra,
 291                                     struct lookup_intent *it,
 292                                     struct lov_stripe_md *lsm)
 293 {
 294         struct inode *inode;
 295         struct ptlrpc_request *request = NULL;
 296         struct mds_body *body;
 297         int rc;
 298         time_t time = CURRENT_TIME;
 299         struct ll_sb_info *sbi = ll_i2sbi(dir);
 300         int gid = current->fsgid;
 301         struct ll_read_inode2_cookie lic;
 302         struct lov_mds_md *lmm = NULL;
 303         int mds_md_size = 0;
 304
 305         ENTRY;
 306
 307         if (dir->i_mode & S_ISGID) {
 308                 gid = dir->i_gid;
 309                 if (S_ISDIR(mode))
 310                         mode |= S_ISGID;
 311         }
 312
 313         if (!it || !it->it_disposition) {
 314                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 315                                  tgtlen, mode, current->fsuid,
 316                                  gid, time, extra, lsm, &request);
 317                 if (rc) {
 318                         inode = ERR_PTR(rc);
 319                         GOTO(out, rc);
 320                 }
 321                 body = lustre_msg_buf(request->rq_repmsg, 0);
 322                 if (lsm != NULL) {
 323                         mds_md_size = ll_mds_easize(dir->i_sb);
 324                         OBD_ALLOC(lmm, mds_md_size);
 325                         lov_packmd(lmm, lsm);
 326                         lic.lic_lmm = lmm;
 327                 } else
 328                         lic.lic_lmm = NULL;
 329
 330         } else {
 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         }
 336
 337         body->valid = OBD_MD_FLNOTOBD;
 338
 339         body->nlink = 1;
 340         body->atime = body->ctime = body->mtime = time;
 341         body->uid = current->fsuid;
 342         body->gid = gid;
 343         body->mode = mode;
 344
 345         lic.lic_body = body;
 346
 347         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 348         if (IS_ERR(inode)) {
 349                 rc = PTR_ERR(inode);
 350                 CERROR("new_inode -fatal: rc %d\n", rc);
 351                 LBUG();
 352                 GOTO(out, rc);
 353         }
 354
 355         if (!list_empty(&inode->i_dentry)) {
 356                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 357                        body->ino, atomic_read(&inode->i_count),
 358                        inode->i_nlink);
 359                 iput(inode);
 360                 LBUG();
 361                 inode = ERR_PTR(-EIO);
 362                 GOTO(out, -EIO);
 363         }
 364
 365         EXIT;
 366  out:
 367         if (lmm)
 368                 OBD_FREE(lmm, mds_md_size);
 369         ptlrpc_free_req(request);
 370         return inode;
 371 }
 372
 373 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 374                          const char *name, int len)
 375 {
 376         struct ptlrpc_request *request = NULL;
 377         struct ll_sb_info *sbi = ll_i2sbi(dir);
 378         int err;
 379
 380         ENTRY;
 381
 382         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 383                          &request);
 384         ptlrpc_free_req(request);
 385
 386         RETURN(err);
 387 }
 388
 389 int ll_mdc_link(struct dentry *src, struct inode *dir,
 390                 const char *name, int len)
 391 {
 392         struct ptlrpc_request *request = NULL;
 393         int err;
 394         struct ll_sb_info *sbi = ll_i2sbi(dir);
 395
 396         ENTRY;
 397
 398         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
 399                        len, &request);
 400         ptlrpc_free_req(request);
 401
 402         RETURN(err);
 403 }
 404
 405 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 406                   struct dentry *old, struct dentry *new)
 407 {
 408         struct ptlrpc_request *request = NULL;
 409         struct ll_sb_info *sbi = ll_i2sbi(src);
 410         int err;
 411
 412         ENTRY;
 413
 414         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 415                          old->d_name.name, old->d_name.len,
 416                          new->d_name.name, new->d_name.len, &request);
 417         ptlrpc_free_req(request);
 418
 419         RETURN(err);
 420 }
 421
 422 /*
 423  * By the time this is called, we already have created
 424  * the directory cache entry for the new file, but it
 425  * is so far negative - it has no inode.
 426  *
 427  * If the create succeeds, we fill in the inode information
 428  * with d_instantiate().
 429  */
 430
 431 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
 432 {
 433         int err, rc = 0;
 434         struct obdo oa;
 435         struct inode *inode;
 436         struct lov_stripe_md *lsm = NULL;
 437         struct ll_inode_info *lli = NULL;
 438         ENTRY;
 439
 440         if (dentry->d_it->it_disposition == 0) {
 441                 memset(&oa, 0, sizeof(oa));
 442                 oa.o_valid = OBD_MD_FLMODE;
 443                 oa.o_mode = S_IFREG | 0600;
 444                 rc = obd_create(ll_i2obdconn(dir), &oa, &lsm);
 445                 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld: rc = %d\n",
 446                        dentry->d_name.name, mode, (long long)oa.o_id, rc);
 447                 if (rc)
 448                         RETURN(rc);
 449         }
 450
 451         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 452                                NULL, 0, mode, 0, dentry->d_it, lsm);
 453
 454         if (IS_ERR(inode)) {
 455                 rc = PTR_ERR(inode);
 456                 CERROR("error creating MDS object for id %Ld: rc = %d\n",
 457                        (unsigned long long)oa.o_id, rc);
 458                 GOTO(out_destroy, rc);
 459         }
 460
 461         if (dentry->d_it->it_disposition) {
 462                 lli = ll_i2info(inode);
 463                 memcpy(&lli->lli_intent_lock_handle,
 464                        dentry->d_it->it_lock_handle,
 465                        sizeof(struct lustre_handle));
 466                 d_instantiate(dentry, inode);
 467         } else {
 468                 /* no directory data updates when intents rule */
 469                 rc = ext2_add_nondir(dentry, inode);
 470         }
 471
 472         RETURN(rc);
 473
 474 out_destroy:
 475         if (lsm) {
 476                 oa.o_easize = ll_mds_easize(inode->i_sb);
 477                 oa.o_valid |= OBD_MD_FLEASIZE;
 478                 err = obd_destroy(ll_i2obdconn(dir), &oa, lsm);
 479                 if (err)
 480                         CERROR("error destroying objid %Ld on error: err %d\n",
 481                        (unsigned long long)oa.o_id, err);
 482         }
 483
 484         return rc;
 485 }
 486
 487 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 488                     int rdev)
 489 {
 490         struct inode *inode;
 491         int err = 0;
 492
 493         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 494                                NULL, 0, mode, rdev, dentry->d_it, NULL);
 495
 496         if (IS_ERR(inode))
 497                 RETURN(PTR_ERR(inode));
 498
 499         /* no directory data updates when intents rule */
 500         if (dentry->d_it && dentry->d_it->it_disposition)
 501                 d_instantiate(dentry, inode);
 502         else
 503                 err = ext2_add_nondir(dentry, inode);
 504
 505         return err;
 506 }
 507
 508 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 509                       const char *symname)
 510 {
 511         unsigned l = strlen(symname);
 512         struct inode *inode;
 513         struct ll_inode_info *lli;
 514         int err = 0;
 515         ENTRY;
 516
 517         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 518                                symname, l, S_IFLNK | S_IRWXUGO, 0,
 519                                dentry->d_it, NULL);
 520         if (IS_ERR(inode))
 521                 RETURN(PTR_ERR(inode));
 522
 523         lli = ll_i2info(inode);
 524
 525         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 526         /* this _could_ be a non-fatal error, since the symlink is already
 527          * stored on the MDS by this point, and we can re-get it in readlink.
 528          */
 529         if (!lli->lli_symlink_name)
 530                 RETURN(-ENOMEM);
 531
 532         memcpy(lli->lli_symlink_name, symname, l + 1);
 533         inode->i_size = l;
 534
 535         /* no directory data updates when intents rule */
 536         if (dentry->d_it && dentry->d_it->it_disposition)
 537                 d_instantiate(dentry, inode);
 538         else
 539                 err = ext2_add_nondir(dentry, inode);
 540
 541         RETURN(err);
 542 }
 543
 544 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 545                    struct dentry *dentry)
 546 {
 547         int err;
 548         struct inode *inode = old_dentry->d_inode;
 549
 550         if (dentry->d_it && dentry->d_it->it_disposition) {
 551                 int err = dentry->d_it->it_status;
 552                 if (err)
 553                         RETURN(err);
 554                 inode->i_ctime = CURRENT_TIME;
 555                 ext2_inc_count(inode);
 556                 atomic_inc(&inode->i_count);
 557                 d_instantiate(dentry, inode);
 558                 invalidate_inode_pages(dir);
 559                 RETURN(err);
 560         }
 561
 562         if (S_ISDIR(inode->i_mode))
 563                 return -EPERM;
 564
 565         if (inode->i_nlink >= EXT2_LINK_MAX)
 566                 return -EMLINK;
 567
 568         err = ll_mdc_link(old_dentry, dir,
 569                           dentry->d_name.name, dentry->d_name.len);
 570         if (err)
 571                 RETURN(err);
 572
 573         inode->i_ctime = CURRENT_TIME;
 574         ext2_inc_count(inode);
 575         atomic_inc(&inode->i_count);
 576
 577         return ext2_add_nondir(dentry, inode);
 578 }
 579
 580 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 581 {
 582         struct inode * inode;
 583         int err = -EMLINK;
 584         ENTRY;
 585
 586         if (dir->i_nlink >= EXT2_LINK_MAX)
 587                 goto out;
 588
 589         ext2_inc_count(dir);
 590
 591         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 592                                NULL, 0, S_IFDIR | mode, 0, dentry->d_it, NULL);
 593         err = PTR_ERR(inode);
 594         if (IS_ERR(inode))
 595                 goto out_dir;
 596
 597         ext2_inc_count(inode);
 598
 599         err = ext2_make_empty(inode, dir);
 600         if (err)
 601                 goto out_fail;
 602
 603         /* no directory data updates when intents rule */
 604         if (dentry->d_it->it_disposition == 0) {
 605                 err = ll_add_link(dentry, inode);
 606                 if (err)
 607                         goto out_fail;
 608         }
 609
 610         d_instantiate(dentry, inode);
 611 out:
 612         EXIT;
 613         return err;
 614
 615 out_fail:
 616         ext2_dec_count(inode);
 617         ext2_dec_count(inode);
 618         iput(inode);
 619         EXIT;
 620 out_dir:
 621         ext2_dec_count(dir);
 622         EXIT;
 623         goto out;
 624 }
 625
 626 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,
 627                             __u32 mode)
 628 {
 629         struct inode * inode = dentry->d_inode;
 630 #if 0
 631         struct ext2_dir_entry_2 * de;
 632         struct page * page;
 633 #endif
 634         int err = -ENOENT;
 635
 636         if (dentry->d_it && dentry->d_it->it_disposition) {
 637                 err = dentry->d_it->it_status;
 638                 invalidate_inode_pages(dir);
 639                 GOTO(out, err);
 640         }
 641
 642 #if 0
 643         de = ext2_find_entry(dir, dentry, &page);
 644         if (!de)
 645                 goto out;
 646 #endif
 647         err = ll_mdc_unlink(dir, dentry->d_inode, mode,
 648                             dentry->d_name.name, dentry->d_name.len);
 649         if (err)
 650                 goto out;
 651
 652 #if 0
 653         err = ext2_delete_entry(de, page);
 654         if (err)
 655                 goto out;
 656 #endif
 657         invalidate_inode_pages(dir);
 658
 659         inode->i_ctime = dir->i_ctime;
 660 out:
 661         ext2_dec_count(inode);
 662         return err;
 663 }
 664
 665 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 666 {
 667         return ll_common_unlink(dir, dentry, S_IFREG);
 668 }
 669
 670 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 671 {
 672         struct inode * inode = dentry->d_inode;
 673         int err = 0;
 674         ENTRY;
 675
 676         if (!dentry->d_it || dentry->d_it->it_disposition == 0) {
 677                 if (!ext2_empty_dir(inode))
 678                         LBUG();
 679                 err = ll_common_unlink(dir, dentry, S_IFDIR);
 680         } else
 681                 err = dentry->d_it->it_status;
 682         if (err)
 683                 RETURN(err);
 684         inode->i_size = 0;
 685         ext2_dec_count(inode);
 686         ext2_dec_count(dir);
 687         RETURN(err);
 688 }
 689
 690 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 691                      struct inode * new_dir, struct dentry * new_dentry)
 692 {
 693         struct inode * old_inode = old_dentry->d_inode;
 694         struct inode * tgt_inode = new_dentry->d_inode;
 695         struct page * dir_page = NULL;
 696         struct ext2_dir_entry_2 * dir_de = NULL;
 697         struct ext2_dir_entry_2 * old_de;
 698         struct page * old_page;
 699         int err = -ENOENT;
 700
 701         if (new_dentry->d_it && new_dentry->d_it->it_disposition) {
 702                 if (tgt_inode) {
 703                         tgt_inode->i_ctime = CURRENT_TIME;
 704                         tgt_inode->i_nlink--;
 705                 }
 706                 invalidate_inode_pages(old_dir);
 707                 invalidate_inode_pages(new_dir);
 708                 GOTO(out, err = new_dentry->d_it->it_status);
 709         }
 710
 711         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 712         if (err)
 713                 goto out;
 714
 715         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 716         if (!old_de)
 717                 goto out;
 718
 719         if (S_ISDIR(old_inode->i_mode)) {
 720                 err = -EIO;
 721                 dir_de = ext2_dotdot(old_inode, &dir_page);
 722                 if (!dir_de)
 723                         goto out_old;
 724         }
 725
 726         if (tgt_inode) {
 727                 struct page *new_page;
 728                 struct ext2_dir_entry_2 *new_de;
 729
 730                 err = -ENOTEMPTY;
 731                 if (dir_de && !ext2_empty_dir (tgt_inode))
 732                         goto out_dir;
 733
 734                 err = -ENOENT;
 735                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 736                 if (!new_de)
 737                         goto out_dir;
 738                 ext2_inc_count(old_inode);
 739                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 740                 tgt_inode->i_ctime = CURRENT_TIME;
 741                 if (dir_de)
 742                         tgt_inode->i_nlink--;
 743                 ext2_dec_count(tgt_inode);
 744         } else {
 745                 if (dir_de) {
 746                         err = -EMLINK;
 747                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 748                                 goto out_dir;
 749                 }
 750                 ext2_inc_count(old_inode);
 751                 err = ll_add_link(new_dentry, old_inode);
 752                 if (err) {
 753                         ext2_dec_count(old_inode);
 754                         goto out_dir;
 755                 }
 756                 if (dir_de)
 757                         ext2_inc_count(new_dir);
 758         }
 759
 760         ext2_delete_entry (old_de, old_page);
 761         ext2_dec_count(old_inode);
 762
 763         if (dir_de) {
 764                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 765                 ext2_dec_count(old_dir);
 766         }
 767         return 0;
 768
 769 out_dir:
 770         if (dir_de) {
 771                 kunmap(dir_page);
 772                 page_cache_release(dir_page);
 773         }
 774 out_old:
 775         kunmap(old_page);
 776         page_cache_release(old_page);
 777 out:
 778         return err;
 779 }
 780
 781 struct inode_operations ll_dir_inode_operations = {
 782         create:         ll_create,
 783         lookup2:        ll_lookup2,
 784         link:           ll_link,
 785         unlink:         ll_unlink,
 786         symlink:        ll_symlink,
 787         mkdir:          ll_mkdir,
 788         rmdir:          ll_rmdir,
 789         mknod:          ll_mknod,
 790         rename:         ll_rename,
 791         setattr:        ll_setattr
 792 };