git.oblomov.eu Git - linux-2.6/blob - fs/ocfs2/namei.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * namei.c
   5  *
   6  * Create and rename file, directory, symlinks
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  *  Portions of this code from linux/fs/ext3/dir.c
  11  *
  12  *  Copyright (C) 1992, 1993, 1994, 1995
  13  *  Remy Card (card@masi.ibp.fr)
  14  *  Laboratoire MASI - Institut Blaise pascal
  15  *  Universite Pierre et Marie Curie (Paris VI)
  16  *
  17  *   from
  18  *
  19  *   linux/fs/minix/dir.c
  20  *
  21  *   Copyright (C) 1991, 1992 Linux Torvalds
  22  *
  23  * This program is free software; you can redistribute it and/or
  24  * modify it under the terms of the GNU General Public
  25  * License as published by the Free Software Foundation; either
  26  * version 2 of the License, or (at your option) any later version.
  27  *
  28  * This program is distributed in the hope that it will be useful,
  29  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  30  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  31  * General Public License for more details.
  32  *
  33  * You should have received a copy of the GNU General Public
  34  * License along with this program; if not, write to the
  35  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  36  * Boston, MA 021110-1307, USA.
  37  */
  38
  39 #include <linux/fs.h>
  40 #include <linux/types.h>
  41 #include <linux/slab.h>
  42 #include <linux/highmem.h>
  43
  44 #define MLOG_MASK_PREFIX ML_NAMEI
  45 #include <cluster/masklog.h>
  46
  47 #include "ocfs2.h"
  48
  49 #include "alloc.h"
  50 #include "dcache.h"
  51 #include "dir.h"
  52 #include "dlmglue.h"
  53 #include "extent_map.h"
  54 #include "file.h"
  55 #include "inode.h"
  56 #include "journal.h"
  57 #include "namei.h"
  58 #include "suballoc.h"
  59 #include "super.h"
  60 #include "symlink.h"
  61 #include "sysfile.h"
  62 #include "uptodate.h"
  63 #include "vote.h"
  64
  65 #include "buffer_head_io.h"
  66
  67 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
  68                               struct inode *dir,
  69                               struct dentry *dentry, int mode,
  70                               dev_t dev,
  71                               struct buffer_head **new_fe_bh,
  72                               struct buffer_head *parent_fe_bh,
  73                               handle_t *handle,
  74                               struct inode **ret_inode,
  75                               struct ocfs2_alloc_context *inode_ac);
  76
  77 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
  78                                     struct inode **ret_orphan_dir,
  79                                     struct inode *inode,
  80                                     char *name,
  81                                     struct buffer_head **de_bh);
  82
  83 static int ocfs2_orphan_add(struct ocfs2_super *osb,
  84                             handle_t *handle,
  85                             struct inode *inode,
  86                             struct ocfs2_dinode *fe,
  87                             char *name,
  88                             struct buffer_head *de_bh,
  89                             struct inode *orphan_dir_inode);
  90
  91 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
  92                                      handle_t *handle,
  93                                      struct inode *inode,
  94                                      const char *symname);
  95
  96 /* An orphan dir name is an 8 byte value, printed as a hex string */
  97 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
  98
  99 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
 100                                    struct nameidata *nd)
 101 {
 102         int status;
 103         u64 blkno;
 104         struct inode *inode = NULL;
 105         struct dentry *ret;
 106         struct ocfs2_inode_info *oi;
 107
 108         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 109                    dentry->d_name.len, dentry->d_name.name);
 110
 111         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
 112                 ret = ERR_PTR(-ENAMETOOLONG);
 113                 goto bail;
 114         }
 115
 116         mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
 117              dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
 118
 119         status = ocfs2_meta_lock(dir, NULL, 0);
 120         if (status < 0) {
 121                 if (status != -ENOENT)
 122                         mlog_errno(status);
 123                 ret = ERR_PTR(status);
 124                 goto bail;
 125         }
 126
 127         status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
 128                                             dentry->d_name.len, &blkno);
 129         if (status < 0)
 130                 goto bail_add;
 131
 132         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
 133         if (IS_ERR(inode)) {
 134                 ret = ERR_PTR(-EACCES);
 135                 goto bail_unlock;
 136         }
 137
 138         oi = OCFS2_I(inode);
 139         /* Clear any orphaned state... If we were able to look up the
 140          * inode from a directory, it certainly can't be orphaned. We
 141          * might have the bad state from a node which intended to
 142          * orphan this inode but crashed before it could commit the
 143          * unlink. */
 144         spin_lock(&oi->ip_lock);
 145         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
 146         spin_unlock(&oi->ip_lock);
 147
 148 bail_add:
 149         dentry->d_op = &ocfs2_dentry_ops;
 150         ret = d_splice_alias(inode, dentry);
 151
 152         if (inode) {
 153                 /*
 154                  * If d_splice_alias() finds a DCACHE_DISCONNECTED
 155                  * dentry, it will d_move() it on top of ourse. The
 156                  * return value will indicate this however, so in
 157                  * those cases, we switch them around for the locking
 158                  * code.
 159                  *
 160                  * NOTE: This dentry already has ->d_op set from
 161                  * ocfs2_get_parent() and ocfs2_get_dentry()
 162                  */
 163                 if (ret)
 164                         dentry = ret;
 165
 166                 status = ocfs2_dentry_attach_lock(dentry, inode,
 167                                                   OCFS2_I(dir)->ip_blkno);
 168                 if (status) {
 169                         mlog_errno(status);
 170                         ret = ERR_PTR(status);
 171                         goto bail_unlock;
 172                 }
 173         }
 174
 175 bail_unlock:
 176         /* Don't drop the cluster lock until *after* the d_add --
 177          * unlink on another node will message us to remove that
 178          * dentry under this lock so otherwise we can race this with
 179          * the vote thread and have a stale dentry. */
 180         ocfs2_meta_unlock(dir, 0);
 181
 182 bail:
 183
 184         mlog_exit_ptr(ret);
 185
 186         return ret;
 187 }
 188
 189 static int ocfs2_mknod(struct inode *dir,
 190                        struct dentry *dentry,
 191                        int mode,
 192                        dev_t dev)
 193 {
 194         int status = 0;
 195         struct buffer_head *parent_fe_bh = NULL;
 196         handle_t *handle = NULL;
 197         struct ocfs2_super *osb;
 198         struct ocfs2_dinode *dirfe;
 199         struct buffer_head *new_fe_bh = NULL;
 200         struct buffer_head *de_bh = NULL;
 201         struct inode *inode = NULL;
 202         struct ocfs2_alloc_context *inode_ac = NULL;
 203         struct ocfs2_alloc_context *data_ac = NULL;
 204
 205         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 206                    (unsigned long)dev, dentry->d_name.len,
 207                    dentry->d_name.name);
 208
 209         /* get our super block */
 210         osb = OCFS2_SB(dir->i_sb);
 211
 212         status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
 213         if (status < 0) {
 214                 if (status != -ENOENT)
 215                         mlog_errno(status);
 216                 return status;
 217         }
 218
 219         if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
 220                 status = -EMLINK;
 221                 goto leave;
 222         }
 223
 224         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
 225         if (!dirfe->i_links_count) {
 226                 /* can't make a file in a deleted directory. */
 227                 status = -ENOENT;
 228                 goto leave;
 229         }
 230
 231         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 232                                            dentry->d_name.len);
 233         if (status)
 234                 goto leave;
 235
 236         /* get a spot inside the dir. */
 237         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 238                                               dentry->d_name.name,
 239                                               dentry->d_name.len, &de_bh);
 240         if (status < 0) {
 241                 mlog_errno(status);
 242                 goto leave;
 243         }
 244
 245         /* reserve an inode spot */
 246         status = ocfs2_reserve_new_inode(osb, &inode_ac);
 247         if (status < 0) {
 248                 if (status != -ENOSPC)
 249                         mlog_errno(status);
 250                 goto leave;
 251         }
 252
 253         /* Reserve a cluster if creating an extent based directory. */
 254         if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
 255                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
 256                 if (status < 0) {
 257                         if (status != -ENOSPC)
 258                                 mlog_errno(status);
 259                         goto leave;
 260                 }
 261         }
 262
 263         handle = ocfs2_start_trans(osb, OCFS2_MKNOD_CREDITS);
 264         if (IS_ERR(handle)) {
 265                 status = PTR_ERR(handle);
 266                 handle = NULL;
 267                 mlog_errno(status);
 268                 goto leave;
 269         }
 270
 271         /* do the real work now. */
 272         status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
 273                                     &new_fe_bh, parent_fe_bh, handle,
 274                                     &inode, inode_ac);
 275         if (status < 0) {
 276                 mlog_errno(status);
 277                 goto leave;
 278         }
 279
 280         if (S_ISDIR(mode)) {
 281                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 282                                             new_fe_bh, data_ac);
 283                 if (status < 0) {
 284                         mlog_errno(status);
 285                         goto leave;
 286                 }
 287
 288                 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
 289                                               OCFS2_JOURNAL_ACCESS_WRITE);
 290                 if (status < 0) {
 291                         mlog_errno(status);
 292                         goto leave;
 293                 }
 294                 le16_add_cpu(&dirfe->i_links_count, 1);
 295                 status = ocfs2_journal_dirty(handle, parent_fe_bh);
 296                 if (status < 0) {
 297                         mlog_errno(status);
 298                         goto leave;
 299                 }
 300                 inc_nlink(dir);
 301         }
 302
 303         status = ocfs2_add_entry(handle, dentry, inode,
 304                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
 305                                  de_bh);
 306         if (status < 0) {
 307                 mlog_errno(status);
 308                 goto leave;
 309         }
 310
 311         status = ocfs2_dentry_attach_lock(dentry, inode,
 312                                           OCFS2_I(dir)->ip_blkno);
 313         if (status) {
 314                 mlog_errno(status);
 315                 goto leave;
 316         }
 317
 318         insert_inode_hash(inode);
 319         dentry->d_op = &ocfs2_dentry_ops;
 320         d_instantiate(dentry, inode);
 321         status = 0;
 322 leave:
 323         if (handle)
 324                 ocfs2_commit_trans(osb, handle);
 325
 326         ocfs2_meta_unlock(dir, 1);
 327
 328         if (status == -ENOSPC)
 329                 mlog(0, "Disk is full\n");
 330
 331         if (new_fe_bh)
 332                 brelse(new_fe_bh);
 333
 334         if (de_bh)
 335                 brelse(de_bh);
 336
 337         if (parent_fe_bh)
 338                 brelse(parent_fe_bh);
 339
 340         if ((status < 0) && inode)
 341                 iput(inode);
 342
 343         if (inode_ac)
 344                 ocfs2_free_alloc_context(inode_ac);
 345
 346         if (data_ac)
 347                 ocfs2_free_alloc_context(data_ac);
 348
 349         mlog_exit(status);
 350
 351         return status;
 352 }
 353
 354 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 355                               struct inode *dir,
 356                               struct dentry *dentry, int mode,
 357                               dev_t dev,
 358                               struct buffer_head **new_fe_bh,
 359                               struct buffer_head *parent_fe_bh,
 360                               handle_t *handle,
 361                               struct inode **ret_inode,
 362                               struct ocfs2_alloc_context *inode_ac)
 363 {
 364         int status = 0;
 365         struct ocfs2_dinode *fe = NULL;
 366         struct ocfs2_extent_list *fel;
 367         u64 fe_blkno = 0;
 368         u16 suballoc_bit;
 369         struct inode *inode = NULL;
 370
 371         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 372                    (unsigned long)dev, dentry->d_name.len,
 373                    dentry->d_name.name);
 374
 375         *new_fe_bh = NULL;
 376         *ret_inode = NULL;
 377
 378         status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
 379                                        &fe_blkno);
 380         if (status < 0) {
 381                 mlog_errno(status);
 382                 goto leave;
 383         }
 384
 385         inode = new_inode(dir->i_sb);
 386         if (IS_ERR(inode)) {
 387                 status = PTR_ERR(inode);
 388                 mlog(ML_ERROR, "new_inode failed!\n");
 389                 goto leave;
 390         }
 391
 392         /* populate as many fields early on as possible - many of
 393          * these are used by the support functions here and in
 394          * callers. */
 395         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
 396         OCFS2_I(inode)->ip_blkno = fe_blkno;
 397         if (S_ISDIR(mode))
 398                 inode->i_nlink = 2;
 399         else
 400                 inode->i_nlink = 1;
 401         inode->i_mode = mode;
 402         spin_lock(&osb->osb_lock);
 403         inode->i_generation = osb->s_next_generation++;
 404         spin_unlock(&osb->osb_lock);
 405
 406         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
 407         if (!*new_fe_bh) {
 408                 status = -EIO;
 409                 mlog_errno(status);
 410                 goto leave;
 411         }
 412         ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
 413
 414         status = ocfs2_journal_access(handle, inode, *new_fe_bh,
 415                                       OCFS2_JOURNAL_ACCESS_CREATE);
 416         if (status < 0) {
 417                 mlog_errno(status);
 418                 goto leave;
 419         }
 420
 421         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
 422         memset(fe, 0, osb->sb->s_blocksize);
 423
 424         fe->i_generation = cpu_to_le32(inode->i_generation);
 425         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
 426         fe->i_blkno = cpu_to_le64(fe_blkno);
 427         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
 428         fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
 429         fe->i_uid = cpu_to_le32(current->fsuid);
 430         if (dir->i_mode & S_ISGID) {
 431                 fe->i_gid = cpu_to_le32(dir->i_gid);
 432                 if (S_ISDIR(mode))
 433                         mode |= S_ISGID;
 434         } else
 435                 fe->i_gid = cpu_to_le32(current->fsgid);
 436         fe->i_mode = cpu_to_le16(mode);
 437         if (S_ISCHR(mode) || S_ISBLK(mode))
 438                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
 439
 440         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 441
 442         fe->i_last_eb_blk = 0;
 443         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
 444         le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
 445         fe->i_atime = fe->i_ctime = fe->i_mtime =
 446                 cpu_to_le64(CURRENT_TIME.tv_sec);
 447         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
 448                 cpu_to_le32(CURRENT_TIME.tv_nsec);
 449         fe->i_dtime = 0;
 450
 451         /*
 452          * If supported, directories start with inline data.
 453          */
 454         if (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) {
 455                 u16 feat = le16_to_cpu(fe->i_dyn_features);
 456
 457                 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
 458
 459                 fe->id2.i_data.id_count = cpu_to_le16(ocfs2_max_inline_data(osb->sb));
 460         } else {
 461                 fel = &fe->id2.i_list;
 462                 fel->l_tree_depth = 0;
 463                 fel->l_next_free_rec = 0;
 464                 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
 465         }
 466
 467         status = ocfs2_journal_dirty(handle, *new_fe_bh);
 468         if (status < 0) {
 469                 mlog_errno(status);
 470                 goto leave;
 471         }
 472
 473         if (ocfs2_populate_inode(inode, fe, 1) < 0) {
 474                 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
 475                      "i_blkno=%llu, i_ino=%lu\n",
 476                      (unsigned long long)(*new_fe_bh)->b_blocknr,
 477                      (unsigned long long)le64_to_cpu(fe->i_blkno),
 478                      inode->i_ino);
 479                 BUG();
 480         }
 481
 482         ocfs2_inode_set_new(osb, inode);
 483         if (!ocfs2_mount_local(osb)) {
 484                 status = ocfs2_create_new_inode_locks(inode);
 485                 if (status < 0)
 486                         mlog_errno(status);
 487         }
 488
 489         status = 0; /* error in ocfs2_create_new_inode_locks is not
 490                      * critical */
 491
 492         *ret_inode = inode;
 493 leave:
 494         if (status < 0) {
 495                 if (*new_fe_bh) {
 496                         brelse(*new_fe_bh);
 497                         *new_fe_bh = NULL;
 498                 }
 499                 if (inode)
 500                         iput(inode);
 501         }
 502
 503         mlog_exit(status);
 504         return status;
 505 }
 506
 507 static int ocfs2_mkdir(struct inode *dir,
 508                        struct dentry *dentry,
 509                        int mode)
 510 {
 511         int ret;
 512
 513         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 514                    dentry->d_name.len, dentry->d_name.name);
 515         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
 516         mlog_exit(ret);
 517
 518         return ret;
 519 }
 520
 521 static int ocfs2_create(struct inode *dir,
 522                         struct dentry *dentry,
 523                         int mode,
 524                         struct nameidata *nd)
 525 {
 526         int ret;
 527
 528         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 529                    dentry->d_name.len, dentry->d_name.name);
 530         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
 531         mlog_exit(ret);
 532
 533         return ret;
 534 }
 535
 536 static int ocfs2_link(struct dentry *old_dentry,
 537                       struct inode *dir,
 538                       struct dentry *dentry)
 539 {
 540         handle_t *handle;
 541         struct inode *inode = old_dentry->d_inode;
 542         int err;
 543         struct buffer_head *fe_bh = NULL;
 544         struct buffer_head *parent_fe_bh = NULL;
 545         struct buffer_head *de_bh = NULL;
 546         struct ocfs2_dinode *fe = NULL;
 547         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 548
 549         mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
 550                    old_dentry->d_name.len, old_dentry->d_name.name,
 551                    dentry->d_name.len, dentry->d_name.name);
 552
 553         if (S_ISDIR(inode->i_mode))
 554                 return -EPERM;
 555
 556         err = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
 557         if (err < 0) {
 558                 if (err != -ENOENT)
 559                         mlog_errno(err);
 560                 return err;
 561         }
 562
 563         if (!dir->i_nlink) {
 564                 err = -ENOENT;
 565                 goto out;
 566         }
 567
 568         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 569                                         dentry->d_name.len);
 570         if (err)
 571                 goto out;
 572
 573         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 574                                            dentry->d_name.name,
 575                                            dentry->d_name.len, &de_bh);
 576         if (err < 0) {
 577                 mlog_errno(err);
 578                 goto out;
 579         }
 580
 581         err = ocfs2_meta_lock(inode, &fe_bh, 1);
 582         if (err < 0) {
 583                 if (err != -ENOENT)
 584                         mlog_errno(err);
 585                 goto out;
 586         }
 587
 588         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 589         if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
 590                 err = -EMLINK;
 591                 goto out_unlock_inode;
 592         }
 593
 594         handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
 595         if (IS_ERR(handle)) {
 596                 err = PTR_ERR(handle);
 597                 handle = NULL;
 598                 mlog_errno(err);
 599                 goto out_unlock_inode;
 600         }
 601
 602         err = ocfs2_journal_access(handle, inode, fe_bh,
 603                                    OCFS2_JOURNAL_ACCESS_WRITE);
 604         if (err < 0) {
 605                 mlog_errno(err);
 606                 goto out_commit;
 607         }
 608
 609         inc_nlink(inode);
 610         inode->i_ctime = CURRENT_TIME;
 611         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 612         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 613         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 614
 615         err = ocfs2_journal_dirty(handle, fe_bh);
 616         if (err < 0) {
 617                 le16_add_cpu(&fe->i_links_count, -1);
 618                 drop_nlink(inode);
 619                 mlog_errno(err);
 620                 goto out_commit;
 621         }
 622
 623         err = ocfs2_add_entry(handle, dentry, inode,
 624                               OCFS2_I(inode)->ip_blkno,
 625                               parent_fe_bh, de_bh);
 626         if (err) {
 627                 le16_add_cpu(&fe->i_links_count, -1);
 628                 drop_nlink(inode);
 629                 mlog_errno(err);
 630                 goto out_commit;
 631         }
 632
 633         err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
 634         if (err) {
 635                 mlog_errno(err);
 636                 goto out_commit;
 637         }
 638
 639         atomic_inc(&inode->i_count);
 640         dentry->d_op = &ocfs2_dentry_ops;
 641         d_instantiate(dentry, inode);
 642
 643 out_commit:
 644         ocfs2_commit_trans(osb, handle);
 645 out_unlock_inode:
 646         ocfs2_meta_unlock(inode, 1);
 647
 648 out:
 649         ocfs2_meta_unlock(dir, 1);
 650
 651         if (de_bh)
 652                 brelse(de_bh);
 653         if (fe_bh)
 654                 brelse(fe_bh);
 655         if (parent_fe_bh)
 656                 brelse(parent_fe_bh);
 657
 658         mlog_exit(err);
 659
 660         return err;
 661 }
 662
 663 /*
 664  * Takes and drops an exclusive lock on the given dentry. This will
 665  * force other nodes to drop it.
 666  */
 667 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
 668 {
 669         int ret;
 670
 671         ret = ocfs2_dentry_lock(dentry, 1);
 672         if (ret)
 673                 mlog_errno(ret);
 674         else
 675                 ocfs2_dentry_unlock(dentry, 1);
 676
 677         return ret;
 678 }
 679
 680 static inline int inode_is_unlinkable(struct inode *inode)
 681 {
 682         if (S_ISDIR(inode->i_mode)) {
 683                 if (inode->i_nlink == 2)
 684                         return 1;
 685                 return 0;
 686         }
 687
 688         if (inode->i_nlink == 1)
 689                 return 1;
 690         return 0;
 691 }
 692
 693 static int ocfs2_unlink(struct inode *dir,
 694                         struct dentry *dentry)
 695 {
 696         int status;
 697         int child_locked = 0;
 698         struct inode *inode = dentry->d_inode;
 699         struct inode *orphan_dir = NULL;
 700         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 701         u64 blkno;
 702         struct ocfs2_dinode *fe = NULL;
 703         struct buffer_head *fe_bh = NULL;
 704         struct buffer_head *parent_node_bh = NULL;
 705         handle_t *handle = NULL;
 706         struct ocfs2_dir_entry *dirent = NULL;
 707         struct buffer_head *dirent_bh = NULL;
 708         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 709         struct buffer_head *orphan_entry_bh = NULL;
 710
 711         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 712                    dentry->d_name.len, dentry->d_name.name);
 713
 714         BUG_ON(dentry->d_parent->d_inode != dir);
 715
 716         mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
 717
 718         if (inode == osb->root_inode) {
 719                 mlog(0, "Cannot delete the root directory\n");
 720                 return -EPERM;
 721         }
 722
 723         status = ocfs2_meta_lock(dir, &parent_node_bh, 1);
 724         if (status < 0) {
 725                 if (status != -ENOENT)
 726                         mlog_errno(status);
 727                 return status;
 728         }
 729
 730         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 731                                           dentry->d_name.len, &blkno,
 732                                           dir, &dirent_bh, &dirent);
 733         if (status < 0) {
 734                 if (status != -ENOENT)
 735                         mlog_errno(status);
 736                 goto leave;
 737         }
 738
 739         if (OCFS2_I(inode)->ip_blkno != blkno) {
 740                 status = -ENOENT;
 741
 742                 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
 743                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
 744                      (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
 745                 goto leave;
 746         }
 747
 748         status = ocfs2_meta_lock(inode, &fe_bh, 1);
 749         if (status < 0) {
 750                 if (status != -ENOENT)
 751                         mlog_errno(status);
 752                 goto leave;
 753         }
 754         child_locked = 1;
 755
 756         if (S_ISDIR(inode->i_mode)) {
 757                 if (!ocfs2_empty_dir(inode)) {
 758                         status = -ENOTEMPTY;
 759                         goto leave;
 760                 } else if (inode->i_nlink != 2) {
 761                         status = -ENOTEMPTY;
 762                         goto leave;
 763                 }
 764         }
 765
 766         status = ocfs2_remote_dentry_delete(dentry);
 767         if (status < 0) {
 768                 /* This vote should succeed under all normal
 769                  * circumstances. */
 770                 mlog_errno(status);
 771                 goto leave;
 772         }
 773
 774         if (inode_is_unlinkable(inode)) {
 775                 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
 776                                                   orphan_name,
 777                                                   &orphan_entry_bh);
 778                 if (status < 0) {
 779                         mlog_errno(status);
 780                         goto leave;
 781                 }
 782         }
 783
 784         handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
 785         if (IS_ERR(handle)) {
 786                 status = PTR_ERR(handle);
 787                 handle = NULL;
 788                 mlog_errno(status);
 789                 goto leave;
 790         }
 791
 792         status = ocfs2_journal_access(handle, inode, fe_bh,
 793                                       OCFS2_JOURNAL_ACCESS_WRITE);
 794         if (status < 0) {
 795                 mlog_errno(status);
 796                 goto leave;
 797         }
 798
 799         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 800
 801         if (inode_is_unlinkable(inode)) {
 802                 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
 803                                           orphan_entry_bh, orphan_dir);
 804                 if (status < 0) {
 805                         mlog_errno(status);
 806                         goto leave;
 807                 }
 808         }
 809
 810         /* delete the name from the parent dir */
 811         status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
 812         if (status < 0) {
 813                 mlog_errno(status);
 814                 goto leave;
 815         }
 816
 817         if (S_ISDIR(inode->i_mode))
 818                 drop_nlink(inode);
 819         drop_nlink(inode);
 820         fe->i_links_count = cpu_to_le16(inode->i_nlink);
 821
 822         status = ocfs2_journal_dirty(handle, fe_bh);
 823         if (status < 0) {
 824                 mlog_errno(status);
 825                 goto leave;
 826         }
 827
 828         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 829         if (S_ISDIR(inode->i_mode))
 830                 drop_nlink(dir);
 831
 832         status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
 833         if (status < 0) {
 834                 mlog_errno(status);
 835                 if (S_ISDIR(inode->i_mode))
 836                         inc_nlink(dir);
 837         }
 838
 839 leave:
 840         if (handle)
 841                 ocfs2_commit_trans(osb, handle);
 842
 843         if (child_locked)
 844                 ocfs2_meta_unlock(inode, 1);
 845
 846         ocfs2_meta_unlock(dir, 1);
 847
 848         if (orphan_dir) {
 849                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
 850                 ocfs2_meta_unlock(orphan_dir, 1);
 851                 mutex_unlock(&orphan_dir->i_mutex);
 852                 iput(orphan_dir);
 853         }
 854
 855         if (fe_bh)
 856                 brelse(fe_bh);
 857
 858         if (dirent_bh)
 859                 brelse(dirent_bh);
 860
 861         if (parent_node_bh)
 862                 brelse(parent_node_bh);
 863
 864         if (orphan_entry_bh)
 865                 brelse(orphan_entry_bh);
 866
 867         mlog_exit(status);
 868
 869         return status;
 870 }
 871
 872 /*
 873  * The only place this should be used is rename!
 874  * if they have the same id, then the 1st one is the only one locked.
 875  */
 876 static int ocfs2_double_lock(struct ocfs2_super *osb,
 877                              struct buffer_head **bh1,
 878                              struct inode *inode1,
 879                              struct buffer_head **bh2,
 880                              struct inode *inode2)
 881 {
 882         int status;
 883         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
 884         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
 885         struct buffer_head **tmpbh;
 886         struct inode *tmpinode;
 887
 888         mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
 889                    (unsigned long long)oi1->ip_blkno,
 890                    (unsigned long long)oi2->ip_blkno);
 891
 892         if (*bh1)
 893                 *bh1 = NULL;
 894         if (*bh2)
 895                 *bh2 = NULL;
 896
 897         /* we always want to lock the one with the lower lockid first. */
 898         if (oi1->ip_blkno != oi2->ip_blkno) {
 899                 if (oi1->ip_blkno < oi2->ip_blkno) {
 900                         /* switch id1 and id2 around */
 901                         mlog(0, "switching them around...\n");
 902                         tmpbh = bh2;
 903                         bh2 = bh1;
 904                         bh1 = tmpbh;
 905
 906                         tmpinode = inode2;
 907                         inode2 = inode1;
 908                         inode1 = tmpinode;
 909                 }
 910                 /* lock id2 */
 911                 status = ocfs2_meta_lock(inode2, bh2, 1);
 912                 if (status < 0) {
 913                         if (status != -ENOENT)
 914                                 mlog_errno(status);
 915                         goto bail;
 916                 }
 917         }
 918
 919         /* lock id1 */
 920         status = ocfs2_meta_lock(inode1, bh1, 1);
 921         if (status < 0) {
 922                 /*
 923                  * An error return must mean that no cluster locks
 924                  * were held on function exit.
 925                  */
 926                 if (oi1->ip_blkno != oi2->ip_blkno)
 927                         ocfs2_meta_unlock(inode2, 1);
 928
 929                 if (status != -ENOENT)
 930                         mlog_errno(status);
 931         }
 932
 933 bail:
 934         mlog_exit(status);
 935         return status;
 936 }
 937
 938 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
 939 {
 940         ocfs2_meta_unlock(inode1, 1);
 941
 942         if (inode1 != inode2)
 943                 ocfs2_meta_unlock(inode2, 1);
 944 }
 945
 946 static int ocfs2_rename(struct inode *old_dir,
 947                         struct dentry *old_dentry,
 948                         struct inode *new_dir,
 949                         struct dentry *new_dentry)
 950 {
 951         int status = 0, rename_lock = 0, parents_locked = 0;
 952         int old_child_locked = 0, new_child_locked = 0;
 953         struct inode *old_inode = old_dentry->d_inode;
 954         struct inode *new_inode = new_dentry->d_inode;
 955         struct inode *orphan_dir = NULL;
 956         struct ocfs2_dinode *newfe = NULL;
 957         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 958         struct buffer_head *orphan_entry_bh = NULL;
 959         struct buffer_head *newfe_bh = NULL;
 960         struct buffer_head *old_inode_bh = NULL;
 961         struct buffer_head *insert_entry_bh = NULL;
 962         struct ocfs2_super *osb = NULL;
 963         u64 newfe_blkno, old_de_ino;
 964         handle_t *handle = NULL;
 965         struct buffer_head *old_dir_bh = NULL;
 966         struct buffer_head *new_dir_bh = NULL;
 967         struct ocfs2_dir_entry *old_inode_dot_dot_de = NULL, *old_de = NULL,
 968                 *new_de = NULL;
 969         struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
 970         struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
 971                                                     // this is the 1st dirent bh
 972         nlink_t old_dir_nlink = old_dir->i_nlink;
 973         struct ocfs2_dinode *old_di;
 974
 975         /* At some point it might be nice to break this function up a
 976          * bit. */
 977
 978         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
 979                    old_dir, old_dentry, new_dir, new_dentry,
 980                    old_dentry->d_name.len, old_dentry->d_name.name,
 981                    new_dentry->d_name.len, new_dentry->d_name.name);
 982
 983         osb = OCFS2_SB(old_dir->i_sb);
 984
 985         if (new_inode) {
 986                 if (!igrab(new_inode))
 987                         BUG();
 988         }
 989
 990         /* Assume a directory hierarchy thusly:
 991          * a/b/c
 992          * a/d
 993          * a,b,c, and d are all directories.
 994          *
 995          * from cwd of 'a' on both nodes:
 996          * node1: mv b/c d
 997          * node2: mv d   b/c
 998          *
 999          * And that's why, just like the VFS, we need a file system
1000          * rename lock. */
1001         if (old_dentry != new_dentry) {
1002                 status = ocfs2_rename_lock(osb);
1003                 if (status < 0) {
1004                         mlog_errno(status);
1005                         goto bail;
1006                 }
1007                 rename_lock = 1;
1008         }
1009
1010         /* if old and new are the same, this'll just do one lock. */
1011         status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1012                                    &new_dir_bh, new_dir);
1013         if (status < 0) {
1014                 mlog_errno(status);
1015                 goto bail;
1016         }
1017         parents_locked = 1;
1018
1019         /* make sure both dirs have bhs
1020          * get an extra ref on old_dir_bh if old==new */
1021         if (!new_dir_bh) {
1022                 if (old_dir_bh) {
1023                         new_dir_bh = old_dir_bh;
1024                         get_bh(new_dir_bh);
1025                 } else {
1026                         mlog(ML_ERROR, "no old_dir_bh!\n");
1027                         status = -EIO;
1028                         goto bail;
1029                 }
1030         }
1031
1032         /*
1033          * Aside from allowing a meta data update, the locking here
1034          * also ensures that the vote thread on other nodes won't have
1035          * to concurrently downconvert the inode and the dentry locks.
1036          */
1037         status = ocfs2_meta_lock(old_inode, &old_inode_bh, 1);
1038         if (status < 0) {
1039                 if (status != -ENOENT)
1040                         mlog_errno(status);
1041                 goto bail;
1042         }
1043         old_child_locked = 1;
1044
1045         status = ocfs2_remote_dentry_delete(old_dentry);
1046         if (status < 0) {
1047                 mlog_errno(status);
1048                 goto bail;
1049         }
1050
1051         if (S_ISDIR(old_inode->i_mode)) {
1052                 u64 old_inode_parent;
1053
1054                 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1055                                                   old_inode, &old_inode_de_bh,
1056                                                   &old_inode_dot_dot_de);
1057                 if (status) {
1058                         status = -EIO;
1059                         goto bail;
1060                 }
1061
1062                 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1063                         status = -EIO;
1064                         goto bail;
1065                 }
1066
1067                 if (!new_inode && new_dir != old_dir &&
1068                     new_dir->i_nlink >= OCFS2_LINK_MAX) {
1069                         status = -EMLINK;
1070                         goto bail;
1071                 }
1072         }
1073
1074         status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1075                                             old_dentry->d_name.len,
1076                                             &old_de_ino);
1077         if (status) {
1078                 status = -ENOENT;
1079                 goto bail;
1080         }
1081
1082         /*
1083          *  Check for inode number is _not_ due to possible IO errors.
1084          *  We might rmdir the source, keep it as pwd of some process
1085          *  and merrily kill the link to whatever was created under the
1086          *  same name. Goodbye sticky bit ;-<
1087          */
1088         if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1089                 status = -ENOENT;
1090                 goto bail;
1091         }
1092
1093         /* check if the target already exists (in which case we need
1094          * to delete it */
1095         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1096                                           new_dentry->d_name.len,
1097                                           &newfe_blkno, new_dir, &new_de_bh,
1098                                           &new_de);
1099         /* The only error we allow here is -ENOENT because the new
1100          * file not existing is perfectly valid. */
1101         if ((status < 0) && (status != -ENOENT)) {
1102                 /* If we cannot find the file specified we should just */
1103                 /* return the error... */
1104                 mlog_errno(status);
1105                 goto bail;
1106         }
1107
1108         if (!new_de && new_inode)
1109                 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1110                      "directory!", new_inode->i_ino);
1111
1112         /* In case we need to overwrite an existing file, we blow it
1113          * away first */
1114         if (new_de) {
1115                 /* VFS didn't think there existed an inode here, but
1116                  * someone else in the cluster must have raced our
1117                  * rename to create one. Today we error cleanly, in
1118                  * the future we should consider calling iget to build
1119                  * a new struct inode for this entry. */
1120                 if (!new_inode) {
1121                         status = -EACCES;
1122
1123                         mlog(0, "We found an inode for name %.*s but VFS "
1124                              "didn't give us one.\n", new_dentry->d_name.len,
1125                              new_dentry->d_name.name);
1126                         goto bail;
1127                 }
1128
1129                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1130                         status = -EACCES;
1131
1132                         mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1133                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1134                              (unsigned long long)newfe_blkno,
1135                              OCFS2_I(new_inode)->ip_flags);
1136                         goto bail;
1137                 }
1138
1139                 status = ocfs2_meta_lock(new_inode, &newfe_bh, 1);
1140                 if (status < 0) {
1141                         if (status != -ENOENT)
1142                                 mlog_errno(status);
1143                         goto bail;
1144                 }
1145                 new_child_locked = 1;
1146
1147                 status = ocfs2_remote_dentry_delete(new_dentry);
1148                 if (status < 0) {
1149                         mlog_errno(status);
1150                         goto bail;
1151                 }
1152
1153                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1154
1155                 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1156                      "newfebh=%p bhblocknr=%llu\n", new_de,
1157                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1158                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1159
1160                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1161                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1162                                                           new_inode,
1163                                                           orphan_name,
1164                                                           &orphan_entry_bh);
1165                         if (status < 0) {
1166                                 mlog_errno(status);
1167                                 goto bail;
1168                         }
1169                 }
1170         } else {
1171                 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1172
1173                 status = ocfs2_check_dir_for_entry(new_dir,
1174                                                    new_dentry->d_name.name,
1175                                                    new_dentry->d_name.len);
1176                 if (status)
1177                         goto bail;
1178
1179                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1180                                                       new_dentry->d_name.name,
1181                                                       new_dentry->d_name.len,
1182                                                       &insert_entry_bh);
1183                 if (status < 0) {
1184                         mlog_errno(status);
1185                         goto bail;
1186                 }
1187         }
1188
1189         handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
1190         if (IS_ERR(handle)) {
1191                 status = PTR_ERR(handle);
1192                 handle = NULL;
1193                 mlog_errno(status);
1194                 goto bail;
1195         }
1196
1197         if (new_de) {
1198                 if (S_ISDIR(new_inode->i_mode)) {
1199                         if (!ocfs2_empty_dir(new_inode) ||
1200                             new_inode->i_nlink != 2) {
1201                                 status = -ENOTEMPTY;
1202                                 goto bail;
1203                         }
1204                 }
1205                 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1206                                               OCFS2_JOURNAL_ACCESS_WRITE);
1207                 if (status < 0) {
1208                         mlog_errno(status);
1209                         goto bail;
1210                 }
1211
1212                 if (S_ISDIR(new_inode->i_mode) ||
1213                     (newfe->i_links_count == cpu_to_le16(1))){
1214                         status = ocfs2_orphan_add(osb, handle, new_inode,
1215                                                   newfe, orphan_name,
1216                                                   orphan_entry_bh, orphan_dir);
1217                         if (status < 0) {
1218                                 mlog_errno(status);
1219                                 goto bail;
1220                         }
1221                 }
1222
1223                 /* change the dirent to point to the correct inode */
1224                 status = ocfs2_update_entry(new_dir, handle, new_de_bh,
1225                                             new_de, old_inode);
1226                 if (status < 0) {
1227                         mlog_errno(status);
1228                         goto bail;
1229                 }
1230                 new_dir->i_version++;
1231
1232                 if (S_ISDIR(new_inode->i_mode))
1233                         newfe->i_links_count = 0;
1234                 else
1235                         le16_add_cpu(&newfe->i_links_count, -1);
1236
1237                 status = ocfs2_journal_dirty(handle, newfe_bh);
1238                 if (status < 0) {
1239                         mlog_errno(status);
1240                         goto bail;
1241                 }
1242         } else {
1243                 /* if the name was not found in new_dir, add it now */
1244                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1245                                          OCFS2_I(old_inode)->ip_blkno,
1246                                          new_dir_bh, insert_entry_bh);
1247         }
1248
1249         old_inode->i_ctime = CURRENT_TIME;
1250         mark_inode_dirty(old_inode);
1251
1252         status = ocfs2_journal_access(handle, old_inode, old_inode_bh,
1253                                       OCFS2_JOURNAL_ACCESS_WRITE);
1254         if (status >= 0) {
1255                 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1256
1257                 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1258                 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1259
1260                 status = ocfs2_journal_dirty(handle, old_inode_bh);
1261                 if (status < 0)
1262                         mlog_errno(status);
1263         } else
1264                 mlog_errno(status);
1265
1266         /*
1267          * Now that the name has been added to new_dir, remove the old name.
1268          *
1269          * We don't keep any directory entry context around until now
1270          * because the insert might have changed the type of directory
1271          * we're dealing with.
1272          */
1273         old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1274                                      old_dentry->d_name.len,
1275                                      old_dir, &old_de);
1276         if (!old_de_bh) {
1277                 status = -EIO;
1278                 goto bail;
1279         }
1280
1281         status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1282         if (status < 0) {
1283                 mlog_errno(status);
1284                 goto bail;
1285         }
1286
1287         if (new_inode) {
1288                 new_inode->i_nlink--;
1289                 new_inode->i_ctime = CURRENT_TIME;
1290         }
1291         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1292         if (old_inode_de_bh) {
1293                 status = ocfs2_update_entry(old_inode, handle, old_inode_de_bh,
1294                                             old_inode_dot_dot_de, new_dir);
1295                 old_dir->i_nlink--;
1296                 if (new_inode) {
1297                         new_inode->i_nlink--;
1298                 } else {
1299                         inc_nlink(new_dir);
1300                         mark_inode_dirty(new_dir);
1301                 }
1302         }
1303         mark_inode_dirty(old_dir);
1304         ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1305         if (new_inode) {
1306                 mark_inode_dirty(new_inode);
1307                 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1308         }
1309
1310         if (old_dir != new_dir) {
1311                 /* Keep the same times on both directories.*/
1312                 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1313
1314                 /*
1315                  * This will also pick up the i_nlink change from the
1316                  * block above.
1317                  */
1318                 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1319         }
1320
1321         if (old_dir_nlink != old_dir->i_nlink) {
1322                 if (!old_dir_bh) {
1323                         mlog(ML_ERROR, "need to change nlink for old dir "
1324                              "%llu from %d to %d but bh is NULL!\n",
1325                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1326                              (int)old_dir_nlink, old_dir->i_nlink);
1327                 } else {
1328                         struct ocfs2_dinode *fe;
1329                         status = ocfs2_journal_access(handle, old_dir,
1330                                                       old_dir_bh,
1331                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1332                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1333                         fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1334                         status = ocfs2_journal_dirty(handle, old_dir_bh);
1335                 }
1336         }
1337
1338         ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1339         status = 0;
1340 bail:
1341         if (rename_lock)
1342                 ocfs2_rename_unlock(osb);
1343
1344         if (handle)
1345                 ocfs2_commit_trans(osb, handle);
1346
1347         if (parents_locked)
1348                 ocfs2_double_unlock(old_dir, new_dir);
1349
1350         if (old_child_locked)
1351                 ocfs2_meta_unlock(old_inode, 1);
1352
1353         if (new_child_locked)
1354                 ocfs2_meta_unlock(new_inode, 1);
1355
1356         if (orphan_dir) {
1357                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1358                 ocfs2_meta_unlock(orphan_dir, 1);
1359                 mutex_unlock(&orphan_dir->i_mutex);
1360                 iput(orphan_dir);
1361         }
1362
1363         if (new_inode)
1364                 sync_mapping_buffers(old_inode->i_mapping);
1365
1366         if (new_inode)
1367                 iput(new_inode);
1368         if (newfe_bh)
1369                 brelse(newfe_bh);
1370         if (old_inode_bh)
1371                 brelse(old_inode_bh);
1372         if (old_dir_bh)
1373                 brelse(old_dir_bh);
1374         if (new_dir_bh)
1375                 brelse(new_dir_bh);
1376         if (new_de_bh)
1377                 brelse(new_de_bh);
1378         if (old_de_bh)
1379                 brelse(old_de_bh);
1380         if (old_inode_de_bh)
1381                 brelse(old_inode_de_bh);
1382         if (orphan_entry_bh)
1383                 brelse(orphan_entry_bh);
1384         if (insert_entry_bh)
1385                 brelse(insert_entry_bh);
1386
1387         mlog_exit(status);
1388
1389         return status;
1390 }
1391
1392 /*
1393  * we expect i_size = strlen(symname). Copy symname into the file
1394  * data, including the null terminator.
1395  */
1396 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1397                                      handle_t *handle,
1398                                      struct inode *inode,
1399                                      const char *symname)
1400 {
1401         struct buffer_head **bhs = NULL;
1402         const char *c;
1403         struct super_block *sb = osb->sb;
1404         u64 p_blkno, p_blocks;
1405         int virtual, blocks, status, i, bytes_left;
1406
1407         bytes_left = i_size_read(inode) + 1;
1408         /* we can't trust i_blocks because we're actually going to
1409          * write i_size + 1 bytes. */
1410         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1411
1412         mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1413                         (unsigned long long)inode->i_blocks,
1414                         i_size_read(inode), blocks);
1415
1416         /* Sanity check -- make sure we're going to fit. */
1417         if (bytes_left >
1418             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1419                 status = -EIO;
1420                 mlog_errno(status);
1421                 goto bail;
1422         }
1423
1424         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1425         if (!bhs) {
1426                 status = -ENOMEM;
1427                 mlog_errno(status);
1428                 goto bail;
1429         }
1430
1431         status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1432                                              NULL);
1433         if (status < 0) {
1434                 mlog_errno(status);
1435                 goto bail;
1436         }
1437
1438         /* links can never be larger than one cluster so we know this
1439          * is all going to be contiguous, but do a sanity check
1440          * anyway. */
1441         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1442                 status = -EIO;
1443                 mlog_errno(status);
1444                 goto bail;
1445         }
1446
1447         virtual = 0;
1448         while(bytes_left > 0) {
1449                 c = &symname[virtual * sb->s_blocksize];
1450
1451                 bhs[virtual] = sb_getblk(sb, p_blkno);
1452                 if (!bhs[virtual]) {
1453                         status = -ENOMEM;
1454                         mlog_errno(status);
1455                         goto bail;
1456                 }
1457                 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1458
1459                 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1460                                               OCFS2_JOURNAL_ACCESS_CREATE);
1461                 if (status < 0) {
1462                         mlog_errno(status);
1463                         goto bail;
1464                 }
1465
1466                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1467
1468                 memcpy(bhs[virtual]->b_data, c,
1469                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1470                        bytes_left);
1471
1472                 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1473                 if (status < 0) {
1474                         mlog_errno(status);
1475                         goto bail;
1476                 }
1477
1478                 virtual++;
1479                 p_blkno++;
1480                 bytes_left -= sb->s_blocksize;
1481         }
1482
1483         status = 0;
1484 bail:
1485
1486         if (bhs) {
1487                 for(i = 0; i < blocks; i++)
1488                         if (bhs[i])
1489                                 brelse(bhs[i]);
1490                 kfree(bhs);
1491         }
1492
1493         mlog_exit(status);
1494         return status;
1495 }
1496
1497 static int ocfs2_symlink(struct inode *dir,
1498                          struct dentry *dentry,
1499                          const char *symname)
1500 {
1501         int status, l, credits;
1502         u64 newsize;
1503         struct ocfs2_super *osb = NULL;
1504         struct inode *inode = NULL;
1505         struct super_block *sb;
1506         struct buffer_head *new_fe_bh = NULL;
1507         struct buffer_head *de_bh = NULL;
1508         struct buffer_head *parent_fe_bh = NULL;
1509         struct ocfs2_dinode *fe = NULL;
1510         struct ocfs2_dinode *dirfe;
1511         handle_t *handle = NULL;
1512         struct ocfs2_alloc_context *inode_ac = NULL;
1513         struct ocfs2_alloc_context *data_ac = NULL;
1514
1515         mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1516                    dentry, symname, dentry->d_name.len, dentry->d_name.name);
1517
1518         sb = dir->i_sb;
1519         osb = OCFS2_SB(sb);
1520
1521         l = strlen(symname) + 1;
1522
1523         credits = ocfs2_calc_symlink_credits(sb);
1524
1525         /* lock the parent directory */
1526         status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
1527         if (status < 0) {
1528                 if (status != -ENOENT)
1529                         mlog_errno(status);
1530                 return status;
1531         }
1532
1533         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1534         if (!dirfe->i_links_count) {
1535                 /* can't make a file in a deleted directory. */
1536                 status = -ENOENT;
1537                 goto bail;
1538         }
1539
1540         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1541                                            dentry->d_name.len);
1542         if (status)
1543                 goto bail;
1544
1545         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1546                                               dentry->d_name.name,
1547                                               dentry->d_name.len, &de_bh);
1548         if (status < 0) {
1549                 mlog_errno(status);
1550                 goto bail;
1551         }
1552
1553         status = ocfs2_reserve_new_inode(osb, &inode_ac);
1554         if (status < 0) {
1555                 if (status != -ENOSPC)
1556                         mlog_errno(status);
1557                 goto bail;
1558         }
1559
1560         /* don't reserve bitmap space for fast symlinks. */
1561         if (l > ocfs2_fast_symlink_chars(sb)) {
1562                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1563                 if (status < 0) {
1564                         if (status != -ENOSPC)
1565                                 mlog_errno(status);
1566                         goto bail;
1567                 }
1568         }
1569
1570         handle = ocfs2_start_trans(osb, credits);
1571         if (IS_ERR(handle)) {
1572                 status = PTR_ERR(handle);
1573                 handle = NULL;
1574                 mlog_errno(status);
1575                 goto bail;
1576         }
1577
1578         status = ocfs2_mknod_locked(osb, dir, dentry,
1579                                     S_IFLNK | S_IRWXUGO, 0,
1580                                     &new_fe_bh, parent_fe_bh, handle,
1581                                     &inode, inode_ac);
1582         if (status < 0) {
1583                 mlog_errno(status);
1584                 goto bail;
1585         }
1586
1587         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1588         inode->i_rdev = 0;
1589         newsize = l - 1;
1590         if (l > ocfs2_fast_symlink_chars(sb)) {
1591                 u32 offset = 0;
1592
1593                 inode->i_op = &ocfs2_symlink_inode_operations;
1594                 status = ocfs2_do_extend_allocation(osb, inode, &offset, 1, 0,
1595                                                     new_fe_bh,
1596                                                     handle, data_ac, NULL,
1597                                                     NULL);
1598                 if (status < 0) {
1599                         if (status != -ENOSPC && status != -EINTR) {
1600                                 mlog(ML_ERROR,
1601                                      "Failed to extend file to %llu\n",
1602                                      (unsigned long long)newsize);
1603                                 mlog_errno(status);
1604                                 status = -ENOSPC;
1605                         }
1606                         goto bail;
1607                 }
1608                 i_size_write(inode, newsize);
1609                 inode->i_blocks = ocfs2_inode_sector_count(inode);
1610         } else {
1611                 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1612                 memcpy((char *) fe->id2.i_symlink, symname, l);
1613                 i_size_write(inode, newsize);
1614                 inode->i_blocks = 0;
1615         }
1616
1617         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1618         if (status < 0) {
1619                 mlog_errno(status);
1620                 goto bail;
1621         }
1622
1623         if (!ocfs2_inode_is_fast_symlink(inode)) {
1624                 status = ocfs2_create_symlink_data(osb, handle, inode,
1625                                                    symname);
1626                 if (status < 0) {
1627                         mlog_errno(status);
1628                         goto bail;
1629                 }
1630         }
1631
1632         status = ocfs2_add_entry(handle, dentry, inode,
1633                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1634                                  de_bh);
1635         if (status < 0) {
1636                 mlog_errno(status);
1637                 goto bail;
1638         }
1639
1640         status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1641         if (status) {
1642                 mlog_errno(status);
1643                 goto bail;
1644         }
1645
1646         insert_inode_hash(inode);
1647         dentry->d_op = &ocfs2_dentry_ops;
1648         d_instantiate(dentry, inode);
1649 bail:
1650         if (handle)
1651                 ocfs2_commit_trans(osb, handle);
1652
1653         ocfs2_meta_unlock(dir, 1);
1654
1655         if (new_fe_bh)
1656                 brelse(new_fe_bh);
1657         if (parent_fe_bh)
1658                 brelse(parent_fe_bh);
1659         if (de_bh)
1660                 brelse(de_bh);
1661         if (inode_ac)
1662                 ocfs2_free_alloc_context(inode_ac);
1663         if (data_ac)
1664                 ocfs2_free_alloc_context(data_ac);
1665         if ((status < 0) && inode)
1666                 iput(inode);
1667
1668         mlog_exit(status);
1669
1670         return status;
1671 }
1672
1673 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1674 {
1675         int status, namelen;
1676
1677         mlog_entry_void();
1678
1679         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1680                            (long long)blkno);
1681         if (namelen <= 0) {
1682                 if (namelen)
1683                         status = namelen;
1684                 else
1685                         status = -EINVAL;
1686                 mlog_errno(status);
1687                 goto bail;
1688         }
1689         if (namelen != OCFS2_ORPHAN_NAMELEN) {
1690                 status = -EINVAL;
1691                 mlog_errno(status);
1692                 goto bail;
1693         }
1694
1695         mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
1696              namelen);
1697
1698         status = 0;
1699 bail:
1700         mlog_exit(status);
1701         return status;
1702 }
1703
1704 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1705                                     struct inode **ret_orphan_dir,
1706                                     struct inode *inode,
1707                                     char *name,
1708                                     struct buffer_head **de_bh)
1709 {
1710         struct inode *orphan_dir_inode;
1711         struct buffer_head *orphan_dir_bh = NULL;
1712         int status = 0;
1713
1714         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1715         if (status < 0) {
1716                 mlog_errno(status);
1717                 return status;
1718         }
1719
1720         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1721                                                        ORPHAN_DIR_SYSTEM_INODE,
1722                                                        osb->slot_num);
1723         if (!orphan_dir_inode) {
1724                 status = -ENOENT;
1725                 mlog_errno(status);
1726                 return status;
1727         }
1728
1729         mutex_lock(&orphan_dir_inode->i_mutex);
1730
1731         status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1732         if (status < 0) {
1733                 mlog_errno(status);
1734                 goto leave;
1735         }
1736
1737         status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1738                                               orphan_dir_bh, name,
1739                                               OCFS2_ORPHAN_NAMELEN, de_bh);
1740         if (status < 0) {
1741                 ocfs2_meta_unlock(orphan_dir_inode, 1);
1742
1743                 mlog_errno(status);
1744                 goto leave;
1745         }
1746
1747         *ret_orphan_dir = orphan_dir_inode;
1748
1749 leave:
1750         if (status) {
1751                 mutex_unlock(&orphan_dir_inode->i_mutex);
1752                 iput(orphan_dir_inode);
1753         }
1754
1755         if (orphan_dir_bh)
1756                 brelse(orphan_dir_bh);
1757
1758         mlog_exit(status);
1759         return status;
1760 }
1761
1762 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1763                             handle_t *handle,
1764                             struct inode *inode,
1765                             struct ocfs2_dinode *fe,
1766                             char *name,
1767                             struct buffer_head *de_bh,
1768                             struct inode *orphan_dir_inode)
1769 {
1770         struct buffer_head *orphan_dir_bh = NULL;
1771         int status = 0;
1772         struct ocfs2_dinode *orphan_fe;
1773
1774         mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
1775
1776         status = ocfs2_read_block(osb,
1777                                   OCFS2_I(orphan_dir_inode)->ip_blkno,
1778                                   &orphan_dir_bh, OCFS2_BH_CACHED,
1779                                   orphan_dir_inode);
1780         if (status < 0) {
1781                 mlog_errno(status);
1782                 goto leave;
1783         }
1784
1785         status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
1786                                       OCFS2_JOURNAL_ACCESS_WRITE);
1787         if (status < 0) {
1788                 mlog_errno(status);
1789                 goto leave;
1790         }
1791
1792         /* we're a cluster, and nlink can change on disk from
1793          * underneath us... */
1794         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1795         if (S_ISDIR(inode->i_mode))
1796                 le16_add_cpu(&orphan_fe->i_links_count, 1);
1797         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1798
1799         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1800         if (status < 0) {
1801                 mlog_errno(status);
1802                 goto leave;
1803         }
1804
1805         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
1806                                    OCFS2_ORPHAN_NAMELEN, inode,
1807                                    OCFS2_I(inode)->ip_blkno,
1808                                    orphan_dir_bh, de_bh);
1809         if (status < 0) {
1810                 mlog_errno(status);
1811                 goto leave;
1812         }
1813
1814         le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
1815
1816         /* Record which orphan dir our inode now resides
1817          * in. delete_inode will use this to determine which orphan
1818          * dir to lock. */
1819         fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
1820
1821         mlog(0, "Inode %llu orphaned in slot %d\n",
1822              (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
1823
1824 leave:
1825         if (orphan_dir_bh)
1826                 brelse(orphan_dir_bh);
1827
1828         mlog_exit(status);
1829         return status;
1830 }
1831
1832 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
1833 int ocfs2_orphan_del(struct ocfs2_super *osb,
1834                      handle_t *handle,
1835                      struct inode *orphan_dir_inode,
1836                      struct inode *inode,
1837                      struct buffer_head *orphan_dir_bh)
1838 {
1839         char name[OCFS2_ORPHAN_NAMELEN + 1];
1840         struct ocfs2_dinode *orphan_fe;
1841         int status = 0;
1842         struct buffer_head *target_de_bh = NULL;
1843         struct ocfs2_dir_entry *target_de = NULL;
1844
1845         mlog_entry_void();
1846
1847         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1848         if (status < 0) {
1849                 mlog_errno(status);
1850                 goto leave;
1851         }
1852
1853         mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
1854              name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
1855              OCFS2_ORPHAN_NAMELEN);
1856
1857         /* find it's spot in the orphan directory */
1858         target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
1859                                         orphan_dir_inode, &target_de);
1860         if (!target_de_bh) {
1861                 status = -ENOENT;
1862                 mlog_errno(status);
1863                 goto leave;
1864         }
1865
1866         /* remove it from the orphan directory */
1867         status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
1868                                     target_de_bh);
1869         if (status < 0) {
1870                 mlog_errno(status);
1871                 goto leave;
1872         }
1873
1874         status = ocfs2_journal_access(handle,orphan_dir_inode,  orphan_dir_bh,
1875                                       OCFS2_JOURNAL_ACCESS_WRITE);
1876         if (status < 0) {
1877                 mlog_errno(status);
1878                 goto leave;
1879         }
1880
1881         /* do the i_nlink dance! :) */
1882         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1883         if (S_ISDIR(inode->i_mode))
1884                 le16_add_cpu(&orphan_fe->i_links_count, -1);
1885         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1886
1887         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1888         if (status < 0) {
1889                 mlog_errno(status);
1890                 goto leave;
1891         }
1892
1893 leave:
1894         if (target_de_bh)
1895                 brelse(target_de_bh);
1896
1897         mlog_exit(status);
1898         return status;
1899 }
1900
1901 const struct inode_operations ocfs2_dir_iops = {
1902         .create         = ocfs2_create,
1903         .lookup         = ocfs2_lookup,
1904         .link           = ocfs2_link,
1905         .unlink         = ocfs2_unlink,
1906         .rmdir          = ocfs2_unlink,
1907         .symlink        = ocfs2_symlink,
1908         .mkdir          = ocfs2_mkdir,
1909         .mknod          = ocfs2_mknod,
1910         .rename         = ocfs2_rename,
1911         .setattr        = ocfs2_setattr,
1912         .getattr        = ocfs2_getattr,
1913         .permission     = ocfs2_permission,
1914 };