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