lustre/llite/namei.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * This code is issued under the GNU General Public License.
   5  * See the file COPYING in this distribution
   6  *
   7  * Copyright (C) 1992, 1993, 1994, 1995
   8  * Remy Card (card@masi.ibp.fr)
   9  * Laboratoire MASI - Institut Blaise Pascal
  10  * Universite Pierre et Marie Curie (Paris VI)
  11  *
  12  *  from
  13  *
  14  *  linux/fs/ext2/namei.c
  15  *
  16  *  Copyright (C) 1991, 1992  Linus Torvalds
  17  *
  18  *  Big-endian to little-endian byte-swapping/bitmaps by
  19  *        David S. Miller (davem@caip.rutgers.edu), 1995
  20  *  Directory entry file type support and forward compatibility hooks
  21  *      for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
  22  *
  23  *  Changes for use in OBDFS
  24  *  Copyright (c) 1999, Seagate Technology Inc.
  25  *  Copyright (C) 2001, Cluster File Systems, Inc.
  26  *                       Rewritten based on recent ext2 page cache use.
  27  *
  28  */
  29
  30 #include <linux/fs.h>
  31 #include <linux/locks.h>
  32 #include <linux/quotaops.h>
  33
  34 #define DEBUG_SUBSYSTEM S_LLITE
  35
  36 #include <linux/obd_support.h>
  37 #include <linux/lustre_lite.h>
  38 #include <linux/lustre_dlm.h>
  39 #include <linux/obd_lov.h>
  40
  41 extern struct address_space_operations ll_aops;
  42
  43 /* from super.c */
  44 extern void ll_change_inode(struct inode *inode);
  45 extern int ll_setattr(struct dentry *de, struct iattr *attr);
  46
  47 /* from dir.c */
  48 extern int ll_add_link (struct dentry *dentry, struct inode *inode);
  49 obd_id ll_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
  50 int ext2_make_empty(struct inode *inode, struct inode *parent);
  51 struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
  52                    struct dentry *dentry, struct page ** res_page);
  53 int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
  54 int ext2_empty_dir (struct inode * inode);
  55 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
  56 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
  57                    struct page *page, struct inode *inode);
  58
  59 /*
  60  * Couple of helper functions - make the code slightly cleaner.
  61  */
  62 static inline void ext2_inc_count(struct inode *inode)
  63 {
  64         inode->i_nlink++;
  65 }
  66
  67 /* postpone the disk update until the inode really goes away */
  68 static inline void ext2_dec_count(struct inode *inode)
  69 {
  70         inode->i_nlink--;
  71 }
  72
  73 static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
  74 {
  75         int err;
  76         err = ll_add_link(dentry, inode);
  77         if (!err) {
  78                 d_instantiate(dentry, inode);
  79                 return 0;
  80         }
  81         ext2_dec_count(inode);
  82         iput(inode);
  83         return err;
  84 }
  85
  86 /* methods */
  87 static int ll_find_inode(struct inode *inode, unsigned long ino, void *opaque)
  88 {
  89         struct ll_read_inode2_cookie *lic = opaque;
  90         struct mds_body *body = lic->lic_body;
  91
  92         if (inode->i_generation != lic->lic_body->generation)
  93                 return 0;
  94
  95         /* Apply the attributes in 'opaque' to this inode */
  96         ll_update_inode(inode, body);
  97
  98         return 1;
  99 }
 100
 101 extern struct dentry_operations ll_d_ops;
 102
 103 int ll_lock(struct inode *dir, struct dentry *dentry,
 104             struct lookup_intent *it, struct lustre_handle *lockh)
 105 {
 106         struct ll_sb_info *sbi = ll_i2sbi(dir);
 107         char *tgt = NULL;
 108         int tgtlen = 0;
 109         int err, lock_mode;
 110
 111         /* CREAT needs to be tested before open (both could be set) */
 112         if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SETATTR | IT_MKNOD))) {
 113                 lock_mode = LCK_PW;
 114         } else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_UNLINK |
 115                                 IT_RMDIR | IT_RENAME | IT_RENAME2 | IT_READLINK|
 116                                 IT_LINK | IT_LINK2 | IT_LOOKUP)) {
 117                 /* XXXphil PW for LINK2/RENAME2? */
 118                 lock_mode = LCK_PR;
 119         } else if (it->it_op & IT_SYMLINK) {
 120                 lock_mode = LCK_PW;
 121                 tgt = it->it_data;
 122                 tgtlen = strlen(tgt);
 123                 it->it_data = NULL;
 124         } else {
 125                 LBUG();
 126                 RETURN(-EINVAL);
 127         }
 128
 129         err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT, it, lock_mode,
 130                           dir, dentry, lockh, tgt, tgtlen, dir, sizeof(*dir));
 131
 132         RETURN(err);
 133 }
 134
 135 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
 136 {
 137         ENTRY;
 138
 139         ldlm_lock_decref(lockh, mode);
 140
 141         RETURN(0);
 142 }
 143
 144 static struct dentry *ll_lookup2(struct inode *dir, struct dentry *dentry,
 145                                  struct lookup_intent *it)
 146 {
 147         struct ptlrpc_request *request = NULL;
 148         struct inode * inode = NULL;
 149         struct ll_sb_info *sbi = ll_i2sbi(dir);
 150         struct ll_read_inode2_cookie lic;
 151         struct lustre_handle lockh;
 152         struct lookup_intent lookup_it = { IT_LOOKUP };
 153         int rc, offset;
 154         obd_id ino = 0;
 155
 156         ENTRY;
 157
 158         /* CHECK_MOUNT_EPOCH(dir); */
 159         if (ll_i2info(dir)->lli_mount_epoch != ll_i2sbi(dir)->ll_mount_epoch) {
 160                 make_bad_inode(dir);
 161                 RETURN(ERR_PTR(-EIO));
 162         }
 163
 164         if (it == NULL) {
 165                 it = &lookup_it;
 166                 dentry->d_it = it;
 167         }
 168
 169         CDEBUG(D_INFO, "name: %*s, intent: %s\n", dentry->d_name.len,
 170                dentry->d_name.name, ldlm_it2str(it->it_op));
 171
 172         if (dentry->d_name.len > EXT2_NAME_LEN)
 173                 RETURN(ERR_PTR(-ENAMETOOLONG));
 174
 175         rc = ll_lock(dir, dentry, it, &lockh);
 176         if (rc < 0)
 177                 RETURN(ERR_PTR(rc));
 178         memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
 179
 180         request = (struct ptlrpc_request *)it->it_data;
 181         if (it->it_disposition) {
 182                 int mode, symlen = 0;
 183                 obd_flag valid;
 184
 185                 offset = 1;
 186                 lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 187                 ino = lic.lic_body->fid1.id;
 188                 mode = lic.lic_body->mode;
 189                 if (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) {
 190                         /* For create ops, we want the lookup to be negative,
 191                          * unless the create failed in a way that indicates
 192                          * that the file is already there */
 193                         if (it->it_status != -EEXIST)
 194                                 GOTO(negative, NULL);
 195                 } else if (it->it_op & (IT_GETATTR | IT_SETATTR | IT_LOOKUP)) {
 196                         /* For check ops, we want the lookup to succeed */
 197                         it->it_data = NULL;
 198                         if (it->it_status)
 199                                 GOTO(neg_req, NULL);
 200                 } else if (it->it_op & (IT_RENAME | IT_LINK)) {
 201                         /* For rename, we want the source lookup to succeed */
 202                         if (it->it_status) {
 203                                 it->it_data = NULL;
 204                                 GOTO(drop_req, rc = it->it_status);
 205                         }
 206                         it->it_data = dentry;
 207                 } else if (it->it_op & (IT_UNLINK | IT_RMDIR)) {
 208                         /* For remove ops, we want the lookup to succeed unless
 209                          * the file truly doesn't exist */
 210                         it->it_data = NULL;
 211                         if (it->it_status == -ENOENT)
 212                                 GOTO(neg_req, NULL);
 213                         goto iget;
 214                 } else if (it->it_op == IT_OPEN) {
 215                         it->it_data = NULL;
 216                         if (it->it_status && it->it_status != -EEXIST)
 217                                 GOTO(neg_req, NULL);
 218                 } else if (it->it_op & (IT_RENAME2 | IT_LINK2)) {
 219                         struct mds_body *body =
 220                                 lustre_msg_buf(request->rq_repmsg, offset);
 221                         it->it_data = NULL;
 222                         /* This means the target lookup is negative */
 223                         if (body->valid == 0)
 224                                 GOTO(neg_req, NULL);
 225                         goto iget;
 226                 }
 227
 228                 /* Do a getattr now that we have the lock */
 229                 valid = OBD_MD_FLNOTOBD | OBD_MD_FLEASIZE;
 230                 if (it->it_op == IT_READLINK) {
 231                         valid |= OBD_MD_LINKNAME;
 232                         symlen = lic.lic_body->size;
 233                 }
 234                 ptlrpc_req_finished(request);
 235                 request = NULL;
 236                 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 237                                  valid, symlen, &request);
 238                 if (rc) {
 239                         CERROR("failure %d inode "LPX64"\n", rc, ino);
 240                         GOTO(drop_req, rc = -abs(rc));
 241                 }
 242                 offset = 0;
 243         } else {
 244                 struct ll_inode_info *lli = ll_i2info(dir);
 245                 int mode;
 246
 247                 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
 248                 offset = 0;
 249
 250                 ino = ll_inode_by_name(dir, dentry, &mode);
 251                 if (!ino) {
 252                         CERROR("inode %*s not found by name\n",
 253                                dentry->d_name.len, dentry->d_name.name);
 254                         GOTO(drop_lock, rc = -ENOENT);
 255                 }
 256
 257                 rc = mdc_getattr(&sbi->ll_mdc_conn, ino, mode,
 258                                  OBD_MD_FLNOTOBD|OBD_MD_FLEASIZE, 0, &request);
 259                 if (rc) {
 260                         CERROR("failure %d inode "LPX64"\n", rc, ino);
 261                         GOTO(drop_req, rc = -abs(rc));
 262                 }
 263         }
 264
 265  iget:
 266         lic.lic_body = lustre_msg_buf(request->rq_repmsg, offset);
 267         if (S_ISREG(lic.lic_body->mode) &&
 268             lic.lic_body->valid & OBD_MD_FLEASIZE) {
 269                 LASSERT(request->rq_repmsg->bufcount > offset);
 270                 lic.lic_lmm = lustre_msg_buf(request->rq_repmsg, offset + 1);
 271         } else
 272                 lic.lic_lmm = NULL;
 273
 274         /* No rpc's happen during iget4, -ENOMEM's are possible */
 275         LASSERT(ino != 0);
 276         inode = iget4(dir->i_sb, ino, ll_find_inode, &lic);
 277
 278         if (!inode) {
 279                 ptlrpc_free_req(request);
 280                 ll_intent_release(dentry);
 281                 RETURN(ERR_PTR(-ENOMEM));
 282         }
 283
 284         EXIT;
 285  neg_req:
 286         ptlrpc_req_finished(request);
 287  negative:
 288         dentry->d_op = &ll_d_ops;
 289         d_add(dentry, inode);
 290
 291         if (ll_d2d(dentry) == NULL)
 292                 ll_set_dd(dentry);
 293         // down(&ll_d2d(dentry)->lld_it_sem);
 294         // dentry->d_it = it;
 295
 296         if (it->it_op == IT_LOOKUP)
 297                 ll_intent_release(dentry);
 298
 299         return NULL;
 300
 301  drop_req:
 302         ptlrpc_free_req(request);
 303  drop_lock:
 304 #warning FIXME: must release lock here
 305         return ERR_PTR(rc);
 306 }
 307
 308 static struct inode *ll_create_node(struct inode *dir, const char *name,
 309                                     int namelen, const char *tgt, int tgtlen,
 310                                     int mode, __u64 extra,
 311                                     struct lookup_intent *it,
 312                                     struct lov_stripe_md *lsm)
 313 {
 314         struct inode *inode;
 315         struct ptlrpc_request *request = NULL;
 316         struct mds_body *body;
 317         time_t time = CURRENT_TIME;
 318         struct ll_sb_info *sbi = ll_i2sbi(dir);
 319         struct ll_read_inode2_cookie lic;
 320         struct lov_mds_md *lmm = NULL;
 321         ENTRY;
 322
 323         if (it && it->it_disposition) {
 324                 int rc = it->it_status;
 325                 if (rc) {
 326                         CERROR("error creating MDS inode for %*s: rc = %d\n",
 327                                namelen, name, rc);
 328                         RETURN(ERR_PTR(rc));
 329                 }
 330                 invalidate_inode_pages(dir);
 331                 request = it->it_data;
 332                 body = lustre_msg_buf(request->rq_repmsg, 1);
 333                 lic.lic_lmm = NULL;
 334         } else {
 335                 int gid = current->fsgid;
 336                 int rc;
 337
 338                 if (lsm) {
 339                         OBD_ALLOC(lmm, lsm->lsm_mds_easize);
 340                         if (!lmm)
 341                                 RETURN(ERR_PTR(-ENOMEM));
 342                         lov_packmd(lmm, lsm);
 343                         lic.lic_lmm = lmm;
 344                 } else
 345                         lic.lic_lmm = NULL;
 346
 347                 if (dir->i_mode & S_ISGID) {
 348                         gid = dir->i_gid;
 349                         if (S_ISDIR(mode))
 350                                 mode |= S_ISGID;
 351                 }
 352
 353                 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
 354                                 tgtlen, mode, current->fsuid, gid,
 355                                 time, extra, lsm, &request);
 356                 if (rc) {
 357                         inode = ERR_PTR(rc);
 358                         GOTO(out, rc);
 359                 }
 360                 body = lustre_msg_buf(request->rq_repmsg, 0);
 361         }
 362
 363         lic.lic_body = body;
 364
 365         LASSERT(body->ino != 0);
 366         inode = iget4(dir->i_sb, body->ino, ll_find_inode, &lic);
 367         if (IS_ERR(inode)) {
 368                 int rc = PTR_ERR(inode);
 369                 CERROR("new_inode -fatal: rc %d\n", rc);
 370                 LBUG();
 371                 GOTO(out, rc);
 372         }
 373
 374         if (!list_empty(&inode->i_dentry)) {
 375                 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
 376                        body->ino, atomic_read(&inode->i_count),
 377                        inode->i_nlink);
 378                 iput(inode);
 379                 LBUG();
 380                 inode = ERR_PTR(-EIO);
 381                 GOTO(out, -EIO);
 382         }
 383
 384         EXIT;
 385  out:
 386         if (lsm && lmm)
 387                 OBD_FREE(lmm, lsm->lsm_mds_easize);
 388         ptlrpc_req_finished(request);
 389         return inode;
 390 }
 391
 392 static int ll_mdc_unlink(struct inode *dir, struct inode *child, __u32 mode,
 393                          const char *name, int len)
 394 {
 395         struct ptlrpc_request *request = NULL;
 396         struct ll_sb_info *sbi = ll_i2sbi(dir);
 397         int err;
 398
 399         ENTRY;
 400
 401         err = mdc_unlink(&sbi->ll_mdc_conn, dir, child, mode, name, len,
 402                          &request);
 403         ptlrpc_req_finished(request);
 404
 405         RETURN(err);
 406 }
 407
 408 int ll_mdc_link(struct dentry *src, struct inode *dir,
 409                 const char *name, int len)
 410 {
 411         struct ptlrpc_request *request = NULL;
 412         int err;
 413         struct ll_sb_info *sbi = ll_i2sbi(dir);
 414
 415         ENTRY;
 416
 417         err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
 418                        len, &request);
 419         ptlrpc_req_finished(request);
 420
 421         RETURN(err);
 422 }
 423
 424 int ll_mdc_rename(struct inode *src, struct inode *tgt,
 425                   struct dentry *old, struct dentry *new)
 426 {
 427         struct ptlrpc_request *request = NULL;
 428         struct ll_sb_info *sbi = ll_i2sbi(src);
 429         int err;
 430
 431         ENTRY;
 432
 433         err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
 434                          old->d_name.name, old->d_name.len,
 435                          new->d_name.name, new->d_name.len, &request);
 436         ptlrpc_req_finished(request);
 437
 438         RETURN(err);
 439 }
 440
 441 /*
 442  * By the time this is called, we already have created the directory cache
 443  * entry for the new file, but it is so far negative - it has no inode.
 444  * We defer creating the OBD object(s) until open, to keep the intent and
 445  * non-intent code paths similar, and also because we do not have the MDS
 446  * inode number before calling ll_create_node() (which is needed for LOV),
 447  * so we would need to do yet another RPC to the MDS to store the LOV EA
 448  * data on the MDS.
 449  *
 450  * If the create succeeds, we fill in the inode information
 451  * with d_instantiate().
 452  */
 453 static int ll_create(struct inode *dir, struct dentry *dentry, int mode)
 454 {
 455         struct lookup_intent *it = dentry->d_it;
 456         struct inode *inode;
 457         int rc = 0;
 458         ENTRY;
 459
 460         CHECK_MOUNT_EPOCH(dir);
 461
 462         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 463                                NULL, 0, mode, 0, it, NULL);
 464
 465         if (IS_ERR(inode))
 466                 RETURN(PTR_ERR(inode));
 467
 468         if (it->it_disposition) {
 469                 struct ll_inode_info *lli = ll_i2info(inode);
 470                 memcpy(&lli->lli_intent_lock_handle, 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
 481 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
 482                     int rdev)
 483 {
 484         struct inode *inode;
 485         int err = 0;
 486
 487         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 488                                NULL, 0, mode, rdev, dentry->d_it, NULL);
 489
 490         if (IS_ERR(inode))
 491                 RETURN(PTR_ERR(inode));
 492
 493         /* no directory data updates when intents rule */
 494         if (dentry->d_it && dentry->d_it->it_disposition)
 495                 d_instantiate(dentry, inode);
 496         else
 497                 err = ext2_add_nondir(dentry, inode);
 498
 499         return err;
 500 }
 501
 502 static int ll_symlink(struct inode *dir, struct dentry *dentry,
 503                       const char *symname)
 504 {
 505         unsigned l = strlen(symname);
 506         struct inode *inode;
 507         struct ll_inode_info *lli;
 508         int err = 0;
 509         ENTRY;
 510
 511         CHECK_MOUNT_EPOCH(dir);
 512
 513         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 514                                symname, l, S_IFLNK | S_IRWXUGO, 0,
 515                                dentry->d_it, NULL);
 516         if (IS_ERR(inode))
 517                 RETURN(PTR_ERR(inode));
 518
 519         lli = ll_i2info(inode);
 520
 521         OBD_ALLOC(lli->lli_symlink_name, l + 1);
 522         /* this _could_ be a non-fatal error, since the symlink is already
 523          * stored on the MDS by this point, and we can re-get it in readlink.
 524          */
 525         if (!lli->lli_symlink_name)
 526                 RETURN(-ENOMEM);
 527
 528         memcpy(lli->lli_symlink_name, symname, l + 1);
 529         inode->i_size = l;
 530
 531         /* no directory data updates when intents rule */
 532         if (dentry->d_it && dentry->d_it->it_disposition)
 533                 d_instantiate(dentry, inode);
 534         else
 535                 err = ext2_add_nondir(dentry, inode);
 536
 537         RETURN(err);
 538 }
 539
 540 static int ll_link(struct dentry *old_dentry, struct inode * dir,
 541                    struct dentry *dentry)
 542 {
 543         struct inode *inode = old_dentry->d_inode;
 544         struct lookup_intent *it = dentry->d_it;
 545         int rc;
 546
 547         if (it && it->it_disposition) {
 548                 if (it->it_status)
 549                         RETURN(it->it_status);
 550                 inode->i_ctime = CURRENT_TIME;
 551                 ext2_inc_count(inode);
 552                 atomic_inc(&inode->i_count);
 553                 d_instantiate(dentry, inode);
 554                 invalidate_inode_pages(dir);
 555                 RETURN(0);
 556         }
 557
 558         if (S_ISDIR(inode->i_mode))
 559                 return -EPERM;
 560
 561         if (inode->i_nlink >= EXT2_LINK_MAX)
 562                 return -EMLINK;
 563
 564         rc = ll_mdc_link(old_dentry, dir,
 565                           dentry->d_name.name, dentry->d_name.len);
 566         if (rc)
 567                 RETURN(rc);
 568
 569         inode->i_ctime = CURRENT_TIME;
 570         ext2_inc_count(inode);
 571         atomic_inc(&inode->i_count);
 572
 573         return ext2_add_nondir(dentry, inode);
 574 }
 575
 576 static int ll_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 577 {
 578         struct inode * inode;
 579         int err = -EMLINK;
 580         ENTRY;
 581
 582         if (dir->i_nlink >= EXT2_LINK_MAX)
 583                 goto out;
 584
 585         ext2_inc_count(dir);
 586
 587         inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
 588                                NULL, 0, S_IFDIR | mode, 0, dentry->d_it, NULL);
 589         err = PTR_ERR(inode);
 590         if (IS_ERR(inode))
 591                 goto out_dir;
 592
 593         ext2_inc_count(inode);
 594
 595         err = ext2_make_empty(inode, dir);
 596         if (err)
 597                 goto out_fail;
 598
 599         /* no directory data updates when intents rule */
 600         if (dentry->d_it->it_disposition == 0) {
 601                 err = ll_add_link(dentry, inode);
 602                 if (err)
 603                         goto out_fail;
 604         }
 605
 606         d_instantiate(dentry, inode);
 607 out:
 608         EXIT;
 609         return err;
 610
 611 out_fail:
 612         ext2_dec_count(inode);
 613         ext2_dec_count(inode);
 614         iput(inode);
 615         EXIT;
 616 out_dir:
 617         ext2_dec_count(dir);
 618         EXIT;
 619         goto out;
 620 }
 621
 622 static int ll_common_unlink(struct inode *dir, struct dentry *dentry,__u32 mode)
 623 {
 624         struct lookup_intent *it = dentry->d_it;
 625         struct inode *inode = dentry->d_inode;
 626 #if 0
 627         struct ext2_dir_entry_2 * de;
 628         struct page * page;
 629 #endif
 630         int rc;
 631
 632         if (it && it->it_disposition) {
 633                 rc = it->it_status;
 634                 invalidate_inode_pages(dir);
 635                 if (rc)
 636                         GOTO(out, rc);
 637                 GOTO(out_dec, 0);
 638         }
 639
 640 #if 0
 641         de = ext2_find_entry(dir, dentry, &page);
 642         if (!de)
 643                 goto out;
 644 #endif
 645         rc = ll_mdc_unlink(dir, dentry->d_inode, mode,
 646                             dentry->d_name.name, dentry->d_name.len);
 647         if (rc)
 648                 GOTO(out, rc);
 649
 650 #if 0
 651         err = ext2_delete_entry(de, page);
 652         if (err)
 653                 goto out;
 654 #endif
 655
 656         /* AED: not sure if needed - directory lock revocation should do it
 657          * in the case where the client has cached it for non-intent ops.
 658          */
 659         invalidate_inode_pages(dir);
 660
 661         inode->i_ctime = dir->i_ctime;
 662 out_dec:
 663         ext2_dec_count(inode);
 664 out:
 665         return rc;
 666 }
 667
 668 static int ll_unlink(struct inode *dir, struct dentry *dentry)
 669 {
 670         return ll_common_unlink(dir, dentry, S_IFREG);
 671 }
 672
 673 static int ll_rmdir(struct inode *dir, struct dentry *dentry)
 674 {
 675         struct inode * inode = dentry->d_inode;
 676         struct lookup_intent *it = dentry->d_it;
 677         int rc = 0;
 678         ENTRY;
 679
 680         if ((!it || !it->it_disposition) && !ext2_empty_dir(inode))
 681                 RETURN(-ENOTEMPTY);
 682
 683         rc = ll_common_unlink(dir, dentry, S_IFDIR);
 684         if (!rc) {
 685                 inode->i_size = 0;
 686                 ext2_dec_count(inode);
 687                 ext2_dec_count(dir);
 688         }
 689
 690         RETURN(rc);
 691 }
 692
 693 static int ll_rename(struct inode * old_dir, struct dentry * old_dentry,
 694                      struct inode * new_dir, struct dentry * new_dentry)
 695 {
 696         struct lookup_intent *it = new_dentry->d_it;
 697         struct inode * old_inode = old_dentry->d_inode;
 698         struct inode * tgt_inode = new_dentry->d_inode;
 699         struct page * dir_page = NULL;
 700         struct ext2_dir_entry_2 * dir_de = NULL;
 701         struct ext2_dir_entry_2 * old_de;
 702         struct page * old_page;
 703         int err;
 704
 705         if (it && it->it_disposition) {
 706                 if (tgt_inode) {
 707                         tgt_inode->i_ctime = CURRENT_TIME;
 708                         tgt_inode->i_nlink--;
 709                 }
 710                 invalidate_inode_pages(old_dir);
 711                 invalidate_inode_pages(new_dir);
 712                 GOTO(out, err = it->it_status);
 713         }
 714
 715         err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
 716         if (err)
 717                 goto out;
 718
 719         old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
 720         if (!old_de)
 721                 goto out;
 722
 723         if (S_ISDIR(old_inode->i_mode)) {
 724                 err = -EIO;
 725                 dir_de = ext2_dotdot(old_inode, &dir_page);
 726                 if (!dir_de)
 727                         goto out_old;
 728         }
 729
 730         if (tgt_inode) {
 731                 struct page *new_page;
 732                 struct ext2_dir_entry_2 *new_de;
 733
 734                 err = -ENOTEMPTY;
 735                 if (dir_de && !ext2_empty_dir (tgt_inode))
 736                         goto out_dir;
 737
 738                 err = -ENOENT;
 739                 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
 740                 if (!new_de)
 741                         goto out_dir;
 742                 ext2_inc_count(old_inode);
 743                 ext2_set_link(new_dir, new_de, new_page, old_inode);
 744                 tgt_inode->i_ctime = CURRENT_TIME;
 745                 if (dir_de)
 746                         tgt_inode->i_nlink--;
 747                 ext2_dec_count(tgt_inode);
 748         } else {
 749                 if (dir_de) {
 750                         err = -EMLINK;
 751                         if (new_dir->i_nlink >= EXT2_LINK_MAX)
 752                                 goto out_dir;
 753                 }
 754                 ext2_inc_count(old_inode);
 755                 err = ll_add_link(new_dentry, old_inode);
 756                 if (err) {
 757                         ext2_dec_count(old_inode);
 758                         goto out_dir;
 759                 }
 760                 if (dir_de)
 761                         ext2_inc_count(new_dir);
 762         }
 763
 764         ext2_delete_entry (old_de, old_page);
 765         ext2_dec_count(old_inode);
 766
 767         if (dir_de) {
 768                 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 769                 ext2_dec_count(old_dir);
 770         }
 771         return 0;
 772
 773 out_dir:
 774         if (dir_de) {
 775                 kunmap(dir_page);
 776                 page_cache_release(dir_page);
 777         }
 778 out_old:
 779         kunmap(old_page);
 780         page_cache_release(old_page);
 781 out:
 782         return err;
 783 }
 784
 785 struct inode_operations ll_dir_inode_operations = {
 786         create:         ll_create,
 787         lookup2:        ll_lookup2,
 788         link:           ll_link,
 789         unlink:         ll_unlink,
 790         symlink:        ll_symlink,
 791         mkdir:          ll_mkdir,
 792         rmdir:          ll_rmdir,
 793         mknod:          ll_mknod,
 794         rename:         ll_rename,
 795         setattr:        ll_setattr
 796 };