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 #include <linux/quotaops.h>
  44
  45 #define MLOG_MASK_PREFIX ML_NAMEI
  46 #include <cluster/masklog.h>
  47
  48 #include "ocfs2.h"
  49
  50 #include "alloc.h"
  51 #include "dcache.h"
  52 #include "dir.h"
  53 #include "dlmglue.h"
  54 #include "extent_map.h"
  55 #include "file.h"
  56 #include "inode.h"
  57 #include "journal.h"
  58 #include "namei.h"
  59 #include "suballoc.h"
  60 #include "super.h"
  61 #include "symlink.h"
  62 #include "sysfile.h"
  63 #include "uptodate.h"
  64 #include "xattr.h"
  65 #include "acl.h"
  66
  67 #include "buffer_head_io.h"
  68
  69 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
  70                               struct inode *dir,
  71                               struct inode *inode,
  72                               dev_t dev,
  73                               struct buffer_head **new_fe_bh,
  74                               struct buffer_head *parent_fe_bh,
  75                               handle_t *handle,
  76                               struct ocfs2_alloc_context *inode_ac);
  77
  78 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
  79                                     struct inode **ret_orphan_dir,
  80                                     u64 blkno,
  81                                     char *name,
  82                                     struct ocfs2_dir_lookup_result *lookup);
  83
  84 static int ocfs2_orphan_add(struct ocfs2_super *osb,
  85                             handle_t *handle,
  86                             struct inode *inode,
  87                             struct buffer_head *fe_bh,
  88                             char *name,
  89                             struct ocfs2_dir_lookup_result *lookup,
  90                             struct inode *orphan_dir_inode);
  91
  92 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
  93                                      handle_t *handle,
  94                                      struct inode *inode,
  95                                      const char *symname);
  96
  97 /* An orphan dir name is an 8 byte value, printed as a hex string */
  98 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
  99
 100 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
 101                                    struct nameidata *nd)
 102 {
 103         int status;
 104         u64 blkno;
 105         struct inode *inode = NULL;
 106         struct dentry *ret;
 107         struct ocfs2_inode_info *oi;
 108
 109         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 110                    dentry->d_name.len, dentry->d_name.name);
 111
 112         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
 113                 ret = ERR_PTR(-ENAMETOOLONG);
 114                 goto bail;
 115         }
 116
 117         mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
 118              dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
 119
 120         status = ocfs2_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT);
 121         if (status < 0) {
 122                 if (status != -ENOENT)
 123                         mlog_errno(status);
 124                 ret = ERR_PTR(status);
 125                 goto bail;
 126         }
 127
 128         status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
 129                                             dentry->d_name.len, &blkno);
 130         if (status < 0)
 131                 goto bail_add;
 132
 133         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
 134         if (IS_ERR(inode)) {
 135                 ret = ERR_PTR(-EACCES);
 136                 goto bail_unlock;
 137         }
 138
 139         oi = OCFS2_I(inode);
 140         /* Clear any orphaned state... If we were able to look up the
 141          * inode from a directory, it certainly can't be orphaned. We
 142          * might have the bad state from a node which intended to
 143          * orphan this inode but crashed before it could commit the
 144          * unlink. */
 145         spin_lock(&oi->ip_lock);
 146         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
 147         spin_unlock(&oi->ip_lock);
 148
 149 bail_add:
 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         } else
 174                 ocfs2_dentry_attach_gen(dentry);
 175
 176 bail_unlock:
 177         /* Don't drop the cluster lock until *after* the d_add --
 178          * unlink on another node will message us to remove that
 179          * dentry under this lock so otherwise we can race this with
 180          * the downconvert thread and have a stale dentry. */
 181         ocfs2_inode_unlock(dir, 0);
 182
 183 bail:
 184
 185         mlog_exit_ptr(ret);
 186
 187         return ret;
 188 }
 189
 190 static struct inode *ocfs2_get_init_inode(struct inode *dir, int mode)
 191 {
 192         struct inode *inode;
 193
 194         inode = new_inode(dir->i_sb);
 195         if (!inode) {
 196                 mlog(ML_ERROR, "new_inode failed!\n");
 197                 return NULL;
 198         }
 199
 200         /* populate as many fields early on as possible - many of
 201          * these are used by the support functions here and in
 202          * callers. */
 203         if (S_ISDIR(mode))
 204                 inode->i_nlink = 2;
 205         else
 206                 inode->i_nlink = 1;
 207         inode_init_owner(inode, dir, mode);
 208         dquot_initialize(inode);
 209         return inode;
 210 }
 211
 212 static int ocfs2_mknod(struct inode *dir,
 213                        struct dentry *dentry,
 214                        int mode,
 215                        dev_t dev)
 216 {
 217         int status = 0;
 218         struct buffer_head *parent_fe_bh = NULL;
 219         handle_t *handle = NULL;
 220         struct ocfs2_super *osb;
 221         struct ocfs2_dinode *dirfe;
 222         struct buffer_head *new_fe_bh = NULL;
 223         struct inode *inode = NULL;
 224         struct ocfs2_alloc_context *inode_ac = NULL;
 225         struct ocfs2_alloc_context *data_ac = NULL;
 226         struct ocfs2_alloc_context *meta_ac = NULL;
 227         int want_clusters = 0;
 228         int want_meta = 0;
 229         int xattr_credits = 0;
 230         struct ocfs2_security_xattr_info si = {
 231                 .enable = 1,
 232         };
 233         int did_quota_inode = 0;
 234         struct ocfs2_dir_lookup_result lookup = { NULL, };
 235         sigset_t oldset;
 236         int did_block_signals = 0;
 237
 238         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
 239                    (unsigned long)dev, dentry->d_name.len,
 240                    dentry->d_name.name);
 241
 242         dquot_initialize(dir);
 243
 244         /* get our super block */
 245         osb = OCFS2_SB(dir->i_sb);
 246
 247         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
 248         if (status < 0) {
 249                 if (status != -ENOENT)
 250                         mlog_errno(status);
 251                 return status;
 252         }
 253
 254         if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
 255                 status = -EMLINK;
 256                 goto leave;
 257         }
 258
 259         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
 260         if (!ocfs2_read_links_count(dirfe)) {
 261                 /* can't make a file in a deleted directory. */
 262                 status = -ENOENT;
 263                 goto leave;
 264         }
 265
 266         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 267                                            dentry->d_name.len);
 268         if (status)
 269                 goto leave;
 270
 271         /* get a spot inside the dir. */
 272         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 273                                               dentry->d_name.name,
 274                                               dentry->d_name.len, &lookup);
 275         if (status < 0) {
 276                 mlog_errno(status);
 277                 goto leave;
 278         }
 279
 280         /* reserve an inode spot */
 281         status = ocfs2_reserve_new_inode(osb, &inode_ac);
 282         if (status < 0) {
 283                 if (status != -ENOSPC)
 284                         mlog_errno(status);
 285                 goto leave;
 286         }
 287
 288         inode = ocfs2_get_init_inode(dir, mode);
 289         if (!inode) {
 290                 status = -ENOMEM;
 291                 mlog_errno(status);
 292                 goto leave;
 293         }
 294
 295         /* get security xattr */
 296         status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
 297         if (status) {
 298                 if (status == -EOPNOTSUPP)
 299                         si.enable = 0;
 300                 else {
 301                         mlog_errno(status);
 302                         goto leave;
 303                 }
 304         }
 305
 306         /* calculate meta data/clusters for setting security and acl xattr */
 307         status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
 308                                        &si, &want_clusters,
 309                                        &xattr_credits, &want_meta);
 310         if (status < 0) {
 311                 mlog_errno(status);
 312                 goto leave;
 313         }
 314
 315         /* Reserve a cluster if creating an extent based directory. */
 316         if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
 317                 want_clusters += 1;
 318
 319                 /* Dir indexing requires extra space as well */
 320                 if (ocfs2_supports_indexed_dirs(osb))
 321                         want_meta++;
 322         }
 323
 324         status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
 325         if (status < 0) {
 326                 if (status != -ENOSPC)
 327                         mlog_errno(status);
 328                 goto leave;
 329         }
 330
 331         status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
 332         if (status < 0) {
 333                 if (status != -ENOSPC)
 334                         mlog_errno(status);
 335                 goto leave;
 336         }
 337
 338         handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
 339                                                             S_ISDIR(mode),
 340                                                             xattr_credits));
 341         if (IS_ERR(handle)) {
 342                 status = PTR_ERR(handle);
 343                 handle = NULL;
 344                 mlog_errno(status);
 345                 goto leave;
 346         }
 347
 348         /* Starting to change things, restart is no longer possible. */
 349         ocfs2_block_signals(&oldset);
 350         did_block_signals = 1;
 351
 352         status = dquot_alloc_inode(inode);
 353         if (status)
 354                 goto leave;
 355         did_quota_inode = 1;
 356
 357         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry,
 358                    inode->i_mode, (unsigned long)dev, dentry->d_name.len,
 359                    dentry->d_name.name);
 360
 361         /* do the real work now. */
 362         status = ocfs2_mknod_locked(osb, dir, inode, dev,
 363                                     &new_fe_bh, parent_fe_bh, handle,
 364                                     inode_ac);
 365         if (status < 0) {
 366                 mlog_errno(status);
 367                 goto leave;
 368         }
 369
 370         if (S_ISDIR(mode)) {
 371                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 372                                             new_fe_bh, data_ac, meta_ac);
 373                 if (status < 0) {
 374                         mlog_errno(status);
 375                         goto leave;
 376                 }
 377
 378                 status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
 379                                                  parent_fe_bh,
 380                                                  OCFS2_JOURNAL_ACCESS_WRITE);
 381                 if (status < 0) {
 382                         mlog_errno(status);
 383                         goto leave;
 384                 }
 385                 ocfs2_add_links_count(dirfe, 1);
 386                 ocfs2_journal_dirty(handle, parent_fe_bh);
 387                 inc_nlink(dir);
 388         }
 389
 390         status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
 391                                 meta_ac, data_ac);
 392         if (status < 0) {
 393                 mlog_errno(status);
 394                 goto leave;
 395         }
 396
 397         if (si.enable) {
 398                 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
 399                                                  meta_ac, data_ac);
 400                 if (status < 0) {
 401                         mlog_errno(status);
 402                         goto leave;
 403                 }
 404         }
 405
 406         /*
 407          * Do this before adding the entry to the directory. We add
 408          * also set d_op after success so that ->d_iput() will cleanup
 409          * the dentry lock even if ocfs2_add_entry() fails below.
 410          */
 411         status = ocfs2_dentry_attach_lock(dentry, inode,
 412                                           OCFS2_I(dir)->ip_blkno);
 413         if (status) {
 414                 mlog_errno(status);
 415                 goto leave;
 416         }
 417
 418         status = ocfs2_add_entry(handle, dentry, inode,
 419                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
 420                                  &lookup);
 421         if (status < 0) {
 422                 mlog_errno(status);
 423                 goto leave;
 424         }
 425
 426         insert_inode_hash(inode);
 427         d_instantiate(dentry, inode);
 428         status = 0;
 429 leave:
 430         if (status < 0 && did_quota_inode)
 431                 dquot_free_inode(inode);
 432         if (handle)
 433                 ocfs2_commit_trans(osb, handle);
 434
 435         ocfs2_inode_unlock(dir, 1);
 436         if (did_block_signals)
 437                 ocfs2_unblock_signals(&oldset);
 438
 439         if (status == -ENOSPC)
 440                 mlog(0, "Disk is full\n");
 441
 442         brelse(new_fe_bh);
 443         brelse(parent_fe_bh);
 444         kfree(si.name);
 445         kfree(si.value);
 446
 447         ocfs2_free_dir_lookup_result(&lookup);
 448
 449         if (inode_ac)
 450                 ocfs2_free_alloc_context(inode_ac);
 451
 452         if (data_ac)
 453                 ocfs2_free_alloc_context(data_ac);
 454
 455         if (meta_ac)
 456                 ocfs2_free_alloc_context(meta_ac);
 457
 458         /*
 459          * We should call iput after the i_mutex of the bitmap been
 460          * unlocked in ocfs2_free_alloc_context, or the
 461          * ocfs2_delete_inode will mutex_lock again.
 462          */
 463         if ((status < 0) && inode) {
 464                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
 465                 clear_nlink(inode);
 466                 iput(inode);
 467         }
 468
 469         mlog_exit(status);
 470
 471         return status;
 472 }
 473
 474 static int __ocfs2_mknod_locked(struct inode *dir,
 475                                 struct inode *inode,
 476                                 dev_t dev,
 477                                 struct buffer_head **new_fe_bh,
 478                                 struct buffer_head *parent_fe_bh,
 479                                 handle_t *handle,
 480                                 struct ocfs2_alloc_context *inode_ac,
 481                                 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
 482 {
 483         int status = 0;
 484         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 485         struct ocfs2_dinode *fe = NULL;
 486         struct ocfs2_extent_list *fel;
 487         u16 feat;
 488
 489         *new_fe_bh = NULL;
 490
 491         /* populate as many fields early on as possible - many of
 492          * these are used by the support functions here and in
 493          * callers. */
 494         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
 495         OCFS2_I(inode)->ip_blkno = fe_blkno;
 496         spin_lock(&osb->osb_lock);
 497         inode->i_generation = osb->s_next_generation++;
 498         spin_unlock(&osb->osb_lock);
 499
 500         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
 501         if (!*new_fe_bh) {
 502                 status = -EIO;
 503                 mlog_errno(status);
 504                 goto leave;
 505         }
 506         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
 507
 508         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
 509                                          *new_fe_bh,
 510                                          OCFS2_JOURNAL_ACCESS_CREATE);
 511         if (status < 0) {
 512                 mlog_errno(status);
 513                 goto leave;
 514         }
 515
 516         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
 517         memset(fe, 0, osb->sb->s_blocksize);
 518
 519         fe->i_generation = cpu_to_le32(inode->i_generation);
 520         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
 521         fe->i_blkno = cpu_to_le64(fe_blkno);
 522         fe->i_suballoc_loc = cpu_to_le64(suballoc_loc);
 523         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
 524         fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
 525         fe->i_uid = cpu_to_le32(inode->i_uid);
 526         fe->i_gid = cpu_to_le32(inode->i_gid);
 527         fe->i_mode = cpu_to_le16(inode->i_mode);
 528         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 529                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
 530
 531         ocfs2_set_links_count(fe, inode->i_nlink);
 532
 533         fe->i_last_eb_blk = 0;
 534         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
 535         le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
 536         fe->i_atime = fe->i_ctime = fe->i_mtime =
 537                 cpu_to_le64(CURRENT_TIME.tv_sec);
 538         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
 539                 cpu_to_le32(CURRENT_TIME.tv_nsec);
 540         fe->i_dtime = 0;
 541
 542         /*
 543          * If supported, directories start with inline data. If inline
 544          * isn't supported, but indexing is, we start them as indexed.
 545          */
 546         feat = le16_to_cpu(fe->i_dyn_features);
 547         if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
 548                 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
 549
 550                 fe->id2.i_data.id_count = cpu_to_le16(
 551                                 ocfs2_max_inline_data_with_xattr(osb->sb, fe));
 552         } else {
 553                 fel = &fe->id2.i_list;
 554                 fel->l_tree_depth = 0;
 555                 fel->l_next_free_rec = 0;
 556                 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
 557         }
 558
 559         ocfs2_journal_dirty(handle, *new_fe_bh);
 560
 561         ocfs2_populate_inode(inode, fe, 1);
 562         ocfs2_ci_set_new(osb, INODE_CACHE(inode));
 563         if (!ocfs2_mount_local(osb)) {
 564                 status = ocfs2_create_new_inode_locks(inode);
 565                 if (status < 0)
 566                         mlog_errno(status);
 567         }
 568
 569         status = 0; /* error in ocfs2_create_new_inode_locks is not
 570                      * critical */
 571
 572 leave:
 573         if (status < 0) {
 574                 if (*new_fe_bh) {
 575                         brelse(*new_fe_bh);
 576                         *new_fe_bh = NULL;
 577                 }
 578         }
 579
 580         mlog_exit(status);
 581         return status;
 582 }
 583
 584 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 585                               struct inode *dir,
 586                               struct inode *inode,
 587                               dev_t dev,
 588                               struct buffer_head **new_fe_bh,
 589                               struct buffer_head *parent_fe_bh,
 590                               handle_t *handle,
 591                               struct ocfs2_alloc_context *inode_ac)
 592 {
 593         int status = 0;
 594         u64 suballoc_loc, fe_blkno = 0;
 595         u16 suballoc_bit;
 596
 597         *new_fe_bh = NULL;
 598
 599         status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
 600                                        inode_ac, &suballoc_loc,
 601                                        &suballoc_bit, &fe_blkno);
 602         if (status < 0) {
 603                 mlog_errno(status);
 604                 return status;
 605         }
 606
 607         return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
 608                                     parent_fe_bh, handle, inode_ac,
 609                                     fe_blkno, suballoc_loc, suballoc_bit);
 610 }
 611
 612 static int ocfs2_mkdir(struct inode *dir,
 613                        struct dentry *dentry,
 614                        int mode)
 615 {
 616         int ret;
 617
 618         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 619                    dentry->d_name.len, dentry->d_name.name);
 620         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
 621         mlog_exit(ret);
 622
 623         return ret;
 624 }
 625
 626 static int ocfs2_create(struct inode *dir,
 627                         struct dentry *dentry,
 628                         int mode,
 629                         struct nameidata *nd)
 630 {
 631         int ret;
 632
 633         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
 634                    dentry->d_name.len, dentry->d_name.name);
 635         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
 636         mlog_exit(ret);
 637
 638         return ret;
 639 }
 640
 641 static int ocfs2_link(struct dentry *old_dentry,
 642                       struct inode *dir,
 643                       struct dentry *dentry)
 644 {
 645         handle_t *handle;
 646         struct inode *inode = old_dentry->d_inode;
 647         int err;
 648         struct buffer_head *fe_bh = NULL;
 649         struct buffer_head *parent_fe_bh = NULL;
 650         struct ocfs2_dinode *fe = NULL;
 651         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 652         struct ocfs2_dir_lookup_result lookup = { NULL, };
 653         sigset_t oldset;
 654
 655         mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
 656                    old_dentry->d_name.len, old_dentry->d_name.name,
 657                    dentry->d_name.len, dentry->d_name.name);
 658
 659         if (S_ISDIR(inode->i_mode))
 660                 return -EPERM;
 661
 662         dquot_initialize(dir);
 663
 664         err = ocfs2_inode_lock_nested(dir, &parent_fe_bh, 1, OI_LS_PARENT);
 665         if (err < 0) {
 666                 if (err != -ENOENT)
 667                         mlog_errno(err);
 668                 return err;
 669         }
 670
 671         if (!dir->i_nlink) {
 672                 err = -ENOENT;
 673                 goto out;
 674         }
 675
 676         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 677                                         dentry->d_name.len);
 678         if (err)
 679                 goto out;
 680
 681         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 682                                            dentry->d_name.name,
 683                                            dentry->d_name.len, &lookup);
 684         if (err < 0) {
 685                 mlog_errno(err);
 686                 goto out;
 687         }
 688
 689         err = ocfs2_inode_lock(inode, &fe_bh, 1);
 690         if (err < 0) {
 691                 if (err != -ENOENT)
 692                         mlog_errno(err);
 693                 goto out;
 694         }
 695
 696         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 697         if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
 698                 err = -EMLINK;
 699                 goto out_unlock_inode;
 700         }
 701
 702         handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
 703         if (IS_ERR(handle)) {
 704                 err = PTR_ERR(handle);
 705                 handle = NULL;
 706                 mlog_errno(err);
 707                 goto out_unlock_inode;
 708         }
 709
 710         /* Starting to change things, restart is no longer possible. */
 711         ocfs2_block_signals(&oldset);
 712
 713         err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 714                                       OCFS2_JOURNAL_ACCESS_WRITE);
 715         if (err < 0) {
 716                 mlog_errno(err);
 717                 goto out_commit;
 718         }
 719
 720         inc_nlink(inode);
 721         inode->i_ctime = CURRENT_TIME;
 722         ocfs2_set_links_count(fe, inode->i_nlink);
 723         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 724         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 725         ocfs2_journal_dirty(handle, fe_bh);
 726
 727         err = ocfs2_add_entry(handle, dentry, inode,
 728                               OCFS2_I(inode)->ip_blkno,
 729                               parent_fe_bh, &lookup);
 730         if (err) {
 731                 ocfs2_add_links_count(fe, -1);
 732                 drop_nlink(inode);
 733                 mlog_errno(err);
 734                 goto out_commit;
 735         }
 736
 737         err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
 738         if (err) {
 739                 mlog_errno(err);
 740                 goto out_commit;
 741         }
 742
 743         ihold(inode);
 744         d_instantiate(dentry, inode);
 745
 746 out_commit:
 747         ocfs2_commit_trans(osb, handle);
 748         ocfs2_unblock_signals(&oldset);
 749 out_unlock_inode:
 750         ocfs2_inode_unlock(inode, 1);
 751
 752 out:
 753         ocfs2_inode_unlock(dir, 1);
 754
 755         brelse(fe_bh);
 756         brelse(parent_fe_bh);
 757
 758         ocfs2_free_dir_lookup_result(&lookup);
 759
 760         mlog_exit(err);
 761
 762         return err;
 763 }
 764
 765 /*
 766  * Takes and drops an exclusive lock on the given dentry. This will
 767  * force other nodes to drop it.
 768  */
 769 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
 770 {
 771         int ret;
 772
 773         ret = ocfs2_dentry_lock(dentry, 1);
 774         if (ret)
 775                 mlog_errno(ret);
 776         else
 777                 ocfs2_dentry_unlock(dentry, 1);
 778
 779         return ret;
 780 }
 781
 782 static inline int inode_is_unlinkable(struct inode *inode)
 783 {
 784         if (S_ISDIR(inode->i_mode)) {
 785                 if (inode->i_nlink == 2)
 786                         return 1;
 787                 return 0;
 788         }
 789
 790         if (inode->i_nlink == 1)
 791                 return 1;
 792         return 0;
 793 }
 794
 795 static int ocfs2_unlink(struct inode *dir,
 796                         struct dentry *dentry)
 797 {
 798         int status;
 799         int child_locked = 0;
 800         struct inode *inode = dentry->d_inode;
 801         struct inode *orphan_dir = NULL;
 802         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 803         u64 blkno;
 804         struct ocfs2_dinode *fe = NULL;
 805         struct buffer_head *fe_bh = NULL;
 806         struct buffer_head *parent_node_bh = NULL;
 807         handle_t *handle = NULL;
 808         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 809         struct ocfs2_dir_lookup_result lookup = { NULL, };
 810         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
 811
 812         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
 813                    dentry->d_name.len, dentry->d_name.name);
 814
 815         dquot_initialize(dir);
 816
 817         BUG_ON(dentry->d_parent->d_inode != dir);
 818
 819         mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
 820
 821         if (inode == osb->root_inode) {
 822                 mlog(0, "Cannot delete the root directory\n");
 823                 return -EPERM;
 824         }
 825
 826         status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
 827                                          OI_LS_PARENT);
 828         if (status < 0) {
 829                 if (status != -ENOENT)
 830                         mlog_errno(status);
 831                 return status;
 832         }
 833
 834         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 835                                           dentry->d_name.len, &blkno, dir,
 836                                           &lookup);
 837         if (status < 0) {
 838                 if (status != -ENOENT)
 839                         mlog_errno(status);
 840                 goto leave;
 841         }
 842
 843         if (OCFS2_I(inode)->ip_blkno != blkno) {
 844                 status = -ENOENT;
 845
 846                 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
 847                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
 848                      (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
 849                 goto leave;
 850         }
 851
 852         status = ocfs2_inode_lock(inode, &fe_bh, 1);
 853         if (status < 0) {
 854                 if (status != -ENOENT)
 855                         mlog_errno(status);
 856                 goto leave;
 857         }
 858         child_locked = 1;
 859
 860         if (S_ISDIR(inode->i_mode)) {
 861                 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
 862                         status = -ENOTEMPTY;
 863                         goto leave;
 864                 }
 865         }
 866
 867         status = ocfs2_remote_dentry_delete(dentry);
 868         if (status < 0) {
 869                 /* This remote delete should succeed under all normal
 870                  * circumstances. */
 871                 mlog_errno(status);
 872                 goto leave;
 873         }
 874
 875         if (inode_is_unlinkable(inode)) {
 876                 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
 877                                                   OCFS2_I(inode)->ip_blkno,
 878                                                   orphan_name, &orphan_insert);
 879                 if (status < 0) {
 880                         mlog_errno(status);
 881                         goto leave;
 882                 }
 883         }
 884
 885         handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
 886         if (IS_ERR(handle)) {
 887                 status = PTR_ERR(handle);
 888                 handle = NULL;
 889                 mlog_errno(status);
 890                 goto leave;
 891         }
 892
 893         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 894                                          OCFS2_JOURNAL_ACCESS_WRITE);
 895         if (status < 0) {
 896                 mlog_errno(status);
 897                 goto leave;
 898         }
 899
 900         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 901
 902         if (inode_is_unlinkable(inode)) {
 903                 status = ocfs2_orphan_add(osb, handle, inode, fe_bh, orphan_name,
 904                                           &orphan_insert, orphan_dir);
 905                 if (status < 0) {
 906                         mlog_errno(status);
 907                         goto leave;
 908                 }
 909         }
 910
 911         /* delete the name from the parent dir */
 912         status = ocfs2_delete_entry(handle, dir, &lookup);
 913         if (status < 0) {
 914                 mlog_errno(status);
 915                 goto leave;
 916         }
 917
 918         if (S_ISDIR(inode->i_mode))
 919                 drop_nlink(inode);
 920         drop_nlink(inode);
 921         ocfs2_set_links_count(fe, inode->i_nlink);
 922         ocfs2_journal_dirty(handle, fe_bh);
 923
 924         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 925         if (S_ISDIR(inode->i_mode))
 926                 drop_nlink(dir);
 927
 928         status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
 929         if (status < 0) {
 930                 mlog_errno(status);
 931                 if (S_ISDIR(inode->i_mode))
 932                         inc_nlink(dir);
 933         }
 934
 935 leave:
 936         if (handle)
 937                 ocfs2_commit_trans(osb, handle);
 938
 939         if (child_locked)
 940                 ocfs2_inode_unlock(inode, 1);
 941
 942         ocfs2_inode_unlock(dir, 1);
 943
 944         if (orphan_dir) {
 945                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
 946                 ocfs2_inode_unlock(orphan_dir, 1);
 947                 mutex_unlock(&orphan_dir->i_mutex);
 948                 iput(orphan_dir);
 949         }
 950
 951         brelse(fe_bh);
 952         brelse(parent_node_bh);
 953
 954         ocfs2_free_dir_lookup_result(&orphan_insert);
 955         ocfs2_free_dir_lookup_result(&lookup);
 956
 957         mlog_exit(status);
 958
 959         return status;
 960 }
 961
 962 /*
 963  * The only place this should be used is rename!
 964  * if they have the same id, then the 1st one is the only one locked.
 965  */
 966 static int ocfs2_double_lock(struct ocfs2_super *osb,
 967                              struct buffer_head **bh1,
 968                              struct inode *inode1,
 969                              struct buffer_head **bh2,
 970                              struct inode *inode2)
 971 {
 972         int status;
 973         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
 974         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
 975         struct buffer_head **tmpbh;
 976         struct inode *tmpinode;
 977
 978         mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
 979                    (unsigned long long)oi1->ip_blkno,
 980                    (unsigned long long)oi2->ip_blkno);
 981
 982         if (*bh1)
 983                 *bh1 = NULL;
 984         if (*bh2)
 985                 *bh2 = NULL;
 986
 987         /* we always want to lock the one with the lower lockid first. */
 988         if (oi1->ip_blkno != oi2->ip_blkno) {
 989                 if (oi1->ip_blkno < oi2->ip_blkno) {
 990                         /* switch id1 and id2 around */
 991                         mlog(0, "switching them around...\n");
 992                         tmpbh = bh2;
 993                         bh2 = bh1;
 994                         bh1 = tmpbh;
 995
 996                         tmpinode = inode2;
 997                         inode2 = inode1;
 998                         inode1 = tmpinode;
 999                 }
1000                 /* lock id2 */
1001                 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
1002                                                  OI_LS_RENAME1);
1003                 if (status < 0) {
1004                         if (status != -ENOENT)
1005                                 mlog_errno(status);
1006                         goto bail;
1007                 }
1008         }
1009
1010         /* lock id1 */
1011         status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2);
1012         if (status < 0) {
1013                 /*
1014                  * An error return must mean that no cluster locks
1015                  * were held on function exit.
1016                  */
1017                 if (oi1->ip_blkno != oi2->ip_blkno) {
1018                         ocfs2_inode_unlock(inode2, 1);
1019                         brelse(*bh2);
1020                         *bh2 = NULL;
1021                 }
1022
1023                 if (status != -ENOENT)
1024                         mlog_errno(status);
1025         }
1026
1027 bail:
1028         mlog_exit(status);
1029         return status;
1030 }
1031
1032 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1033 {
1034         ocfs2_inode_unlock(inode1, 1);
1035
1036         if (inode1 != inode2)
1037                 ocfs2_inode_unlock(inode2, 1);
1038 }
1039
1040 static int ocfs2_rename(struct inode *old_dir,
1041                         struct dentry *old_dentry,
1042                         struct inode *new_dir,
1043                         struct dentry *new_dentry)
1044 {
1045         int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1046         int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1047         struct inode *old_inode = old_dentry->d_inode;
1048         struct inode *new_inode = new_dentry->d_inode;
1049         struct inode *orphan_dir = NULL;
1050         struct ocfs2_dinode *newfe = NULL;
1051         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1052         struct buffer_head *newfe_bh = NULL;
1053         struct buffer_head *old_inode_bh = NULL;
1054         struct ocfs2_super *osb = NULL;
1055         u64 newfe_blkno, old_de_ino;
1056         handle_t *handle = NULL;
1057         struct buffer_head *old_dir_bh = NULL;
1058         struct buffer_head *new_dir_bh = NULL;
1059         nlink_t old_dir_nlink = old_dir->i_nlink;
1060         struct ocfs2_dinode *old_di;
1061         struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1062         struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1063         struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1064         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1065         struct ocfs2_dir_lookup_result target_insert = { NULL, };
1066
1067         /* At some point it might be nice to break this function up a
1068          * bit. */
1069
1070         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1071                    old_dir, old_dentry, new_dir, new_dentry,
1072                    old_dentry->d_name.len, old_dentry->d_name.name,
1073                    new_dentry->d_name.len, new_dentry->d_name.name);
1074
1075         dquot_initialize(old_dir);
1076         dquot_initialize(new_dir);
1077
1078         osb = OCFS2_SB(old_dir->i_sb);
1079
1080         if (new_inode) {
1081                 if (!igrab(new_inode))
1082                         BUG();
1083         }
1084
1085         /* Assume a directory hierarchy thusly:
1086          * a/b/c
1087          * a/d
1088          * a,b,c, and d are all directories.
1089          *
1090          * from cwd of 'a' on both nodes:
1091          * node1: mv b/c d
1092          * node2: mv d   b/c
1093          *
1094          * And that's why, just like the VFS, we need a file system
1095          * rename lock. */
1096         if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1097                 status = ocfs2_rename_lock(osb);
1098                 if (status < 0) {
1099                         mlog_errno(status);
1100                         goto bail;
1101                 }
1102                 rename_lock = 1;
1103         }
1104
1105         /* if old and new are the same, this'll just do one lock. */
1106         status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1107                                    &new_dir_bh, new_dir);
1108         if (status < 0) {
1109                 mlog_errno(status);
1110                 goto bail;
1111         }
1112         parents_locked = 1;
1113
1114         /* make sure both dirs have bhs
1115          * get an extra ref on old_dir_bh if old==new */
1116         if (!new_dir_bh) {
1117                 if (old_dir_bh) {
1118                         new_dir_bh = old_dir_bh;
1119                         get_bh(new_dir_bh);
1120                 } else {
1121                         mlog(ML_ERROR, "no old_dir_bh!\n");
1122                         status = -EIO;
1123                         goto bail;
1124                 }
1125         }
1126
1127         /*
1128          * Aside from allowing a meta data update, the locking here
1129          * also ensures that the downconvert thread on other nodes
1130          * won't have to concurrently downconvert the inode and the
1131          * dentry locks.
1132          */
1133         status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1134                                          OI_LS_PARENT);
1135         if (status < 0) {
1136                 if (status != -ENOENT)
1137                         mlog_errno(status);
1138                 goto bail;
1139         }
1140         old_child_locked = 1;
1141
1142         status = ocfs2_remote_dentry_delete(old_dentry);
1143         if (status < 0) {
1144                 mlog_errno(status);
1145                 goto bail;
1146         }
1147
1148         if (S_ISDIR(old_inode->i_mode)) {
1149                 u64 old_inode_parent;
1150
1151                 update_dot_dot = 1;
1152                 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1153                                                   old_inode,
1154                                                   &old_inode_dot_dot_res);
1155                 if (status) {
1156                         status = -EIO;
1157                         goto bail;
1158                 }
1159
1160                 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1161                         status = -EIO;
1162                         goto bail;
1163                 }
1164
1165                 if (!new_inode && new_dir != old_dir &&
1166                     new_dir->i_nlink >= ocfs2_link_max(osb)) {
1167                         status = -EMLINK;
1168                         goto bail;
1169                 }
1170         }
1171
1172         status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1173                                             old_dentry->d_name.len,
1174                                             &old_de_ino);
1175         if (status) {
1176                 status = -ENOENT;
1177                 goto bail;
1178         }
1179
1180         /*
1181          *  Check for inode number is _not_ due to possible IO errors.
1182          *  We might rmdir the source, keep it as pwd of some process
1183          *  and merrily kill the link to whatever was created under the
1184          *  same name. Goodbye sticky bit ;-<
1185          */
1186         if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1187                 status = -ENOENT;
1188                 goto bail;
1189         }
1190
1191         /* check if the target already exists (in which case we need
1192          * to delete it */
1193         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1194                                           new_dentry->d_name.len,
1195                                           &newfe_blkno, new_dir,
1196                                           &target_lookup_res);
1197         /* The only error we allow here is -ENOENT because the new
1198          * file not existing is perfectly valid. */
1199         if ((status < 0) && (status != -ENOENT)) {
1200                 /* If we cannot find the file specified we should just */
1201                 /* return the error... */
1202                 mlog_errno(status);
1203                 goto bail;
1204         }
1205         if (status == 0)
1206                 target_exists = 1;
1207
1208         if (!target_exists && new_inode) {
1209                 /*
1210                  * Target was unlinked by another node while we were
1211                  * waiting to get to ocfs2_rename(). There isn't
1212                  * anything we can do here to help the situation, so
1213                  * bubble up the appropriate error.
1214                  */
1215                 status = -ENOENT;
1216                 goto bail;
1217         }
1218
1219         /* In case we need to overwrite an existing file, we blow it
1220          * away first */
1221         if (target_exists) {
1222                 /* VFS didn't think there existed an inode here, but
1223                  * someone else in the cluster must have raced our
1224                  * rename to create one. Today we error cleanly, in
1225                  * the future we should consider calling iget to build
1226                  * a new struct inode for this entry. */
1227                 if (!new_inode) {
1228                         status = -EACCES;
1229
1230                         mlog(0, "We found an inode for name %.*s but VFS "
1231                              "didn't give us one.\n", new_dentry->d_name.len,
1232                              new_dentry->d_name.name);
1233                         goto bail;
1234                 }
1235
1236                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1237                         status = -EACCES;
1238
1239                         mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1240                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1241                              (unsigned long long)newfe_blkno,
1242                              OCFS2_I(new_inode)->ip_flags);
1243                         goto bail;
1244                 }
1245
1246                 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1247                 if (status < 0) {
1248                         if (status != -ENOENT)
1249                                 mlog_errno(status);
1250                         goto bail;
1251                 }
1252                 new_child_locked = 1;
1253
1254                 status = ocfs2_remote_dentry_delete(new_dentry);
1255                 if (status < 0) {
1256                         mlog_errno(status);
1257                         goto bail;
1258                 }
1259
1260                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1261
1262                 mlog(0, "aha rename over existing... new_blkno=%llu "
1263                      "newfebh=%p bhblocknr=%llu\n",
1264                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1265                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1266
1267                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1268                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1269                                                 OCFS2_I(new_inode)->ip_blkno,
1270                                                 orphan_name, &orphan_insert);
1271                         if (status < 0) {
1272                                 mlog_errno(status);
1273                                 goto bail;
1274                         }
1275                 }
1276         } else {
1277                 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1278
1279                 status = ocfs2_check_dir_for_entry(new_dir,
1280                                                    new_dentry->d_name.name,
1281                                                    new_dentry->d_name.len);
1282                 if (status)
1283                         goto bail;
1284
1285                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1286                                                       new_dentry->d_name.name,
1287                                                       new_dentry->d_name.len,
1288                                                       &target_insert);
1289                 if (status < 0) {
1290                         mlog_errno(status);
1291                         goto bail;
1292                 }
1293         }
1294
1295         handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1296         if (IS_ERR(handle)) {
1297                 status = PTR_ERR(handle);
1298                 handle = NULL;
1299                 mlog_errno(status);
1300                 goto bail;
1301         }
1302
1303         if (target_exists) {
1304                 if (S_ISDIR(new_inode->i_mode)) {
1305                         if (new_inode->i_nlink != 2 ||
1306                             !ocfs2_empty_dir(new_inode)) {
1307                                 status = -ENOTEMPTY;
1308                                 goto bail;
1309                         }
1310                 }
1311                 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1312                                                  newfe_bh,
1313                                                  OCFS2_JOURNAL_ACCESS_WRITE);
1314                 if (status < 0) {
1315                         mlog_errno(status);
1316                         goto bail;
1317                 }
1318
1319                 if (S_ISDIR(new_inode->i_mode) ||
1320                     (ocfs2_read_links_count(newfe) == 1)) {
1321                         status = ocfs2_orphan_add(osb, handle, new_inode,
1322                                                   newfe_bh, orphan_name,
1323                                                   &orphan_insert, orphan_dir);
1324                         if (status < 0) {
1325                                 mlog_errno(status);
1326                                 goto bail;
1327                         }
1328                 }
1329
1330                 /* change the dirent to point to the correct inode */
1331                 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1332                                             old_inode);
1333                 if (status < 0) {
1334                         mlog_errno(status);
1335                         goto bail;
1336                 }
1337                 new_dir->i_version++;
1338
1339                 if (S_ISDIR(new_inode->i_mode))
1340                         ocfs2_set_links_count(newfe, 0);
1341                 else
1342                         ocfs2_add_links_count(newfe, -1);
1343                 ocfs2_journal_dirty(handle, newfe_bh);
1344         } else {
1345                 /* if the name was not found in new_dir, add it now */
1346                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1347                                          OCFS2_I(old_inode)->ip_blkno,
1348                                          new_dir_bh, &target_insert);
1349         }
1350
1351         old_inode->i_ctime = CURRENT_TIME;
1352         mark_inode_dirty(old_inode);
1353
1354         status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1355                                          old_inode_bh,
1356                                          OCFS2_JOURNAL_ACCESS_WRITE);
1357         if (status >= 0) {
1358                 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1359
1360                 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1361                 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1362                 ocfs2_journal_dirty(handle, old_inode_bh);
1363         } else
1364                 mlog_errno(status);
1365
1366         /*
1367          * Now that the name has been added to new_dir, remove the old name.
1368          *
1369          * We don't keep any directory entry context around until now
1370          * because the insert might have changed the type of directory
1371          * we're dealing with.
1372          */
1373         status = ocfs2_find_entry(old_dentry->d_name.name,
1374                                   old_dentry->d_name.len, old_dir,
1375                                   &old_entry_lookup);
1376         if (status)
1377                 goto bail;
1378
1379         status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1380         if (status < 0) {
1381                 mlog_errno(status);
1382                 goto bail;
1383         }
1384
1385         if (new_inode) {
1386                 new_inode->i_nlink--;
1387                 new_inode->i_ctime = CURRENT_TIME;
1388         }
1389         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1390
1391         if (update_dot_dot) {
1392                 status = ocfs2_update_entry(old_inode, handle,
1393                                             &old_inode_dot_dot_res, new_dir);
1394                 old_dir->i_nlink--;
1395                 if (new_inode) {
1396                         new_inode->i_nlink--;
1397                 } else {
1398                         inc_nlink(new_dir);
1399                         mark_inode_dirty(new_dir);
1400                 }
1401         }
1402         mark_inode_dirty(old_dir);
1403         ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1404         if (new_inode) {
1405                 mark_inode_dirty(new_inode);
1406                 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1407         }
1408
1409         if (old_dir != new_dir) {
1410                 /* Keep the same times on both directories.*/
1411                 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1412
1413                 /*
1414                  * This will also pick up the i_nlink change from the
1415                  * block above.
1416                  */
1417                 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1418         }
1419
1420         if (old_dir_nlink != old_dir->i_nlink) {
1421                 if (!old_dir_bh) {
1422                         mlog(ML_ERROR, "need to change nlink for old dir "
1423                              "%llu from %d to %d but bh is NULL!\n",
1424                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1425                              (int)old_dir_nlink, old_dir->i_nlink);
1426                 } else {
1427                         struct ocfs2_dinode *fe;
1428                         status = ocfs2_journal_access_di(handle,
1429                                                          INODE_CACHE(old_dir),
1430                                                          old_dir_bh,
1431                                                          OCFS2_JOURNAL_ACCESS_WRITE);
1432                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1433                         ocfs2_set_links_count(fe, old_dir->i_nlink);
1434                         ocfs2_journal_dirty(handle, old_dir_bh);
1435                 }
1436         }
1437         ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1438         status = 0;
1439 bail:
1440         if (rename_lock)
1441                 ocfs2_rename_unlock(osb);
1442
1443         if (handle)
1444                 ocfs2_commit_trans(osb, handle);
1445
1446         if (parents_locked)
1447                 ocfs2_double_unlock(old_dir, new_dir);
1448
1449         if (old_child_locked)
1450                 ocfs2_inode_unlock(old_inode, 1);
1451
1452         if (new_child_locked)
1453                 ocfs2_inode_unlock(new_inode, 1);
1454
1455         if (orphan_dir) {
1456                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1457                 ocfs2_inode_unlock(orphan_dir, 1);
1458                 mutex_unlock(&orphan_dir->i_mutex);
1459                 iput(orphan_dir);
1460         }
1461
1462         if (new_inode)
1463                 sync_mapping_buffers(old_inode->i_mapping);
1464
1465         if (new_inode)
1466                 iput(new_inode);
1467
1468         ocfs2_free_dir_lookup_result(&target_lookup_res);
1469         ocfs2_free_dir_lookup_result(&old_entry_lookup);
1470         ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1471         ocfs2_free_dir_lookup_result(&orphan_insert);
1472         ocfs2_free_dir_lookup_result(&target_insert);
1473
1474         brelse(newfe_bh);
1475         brelse(old_inode_bh);
1476         brelse(old_dir_bh);
1477         brelse(new_dir_bh);
1478
1479         mlog_exit(status);
1480
1481         return status;
1482 }
1483
1484 /*
1485  * we expect i_size = strlen(symname). Copy symname into the file
1486  * data, including the null terminator.
1487  */
1488 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1489                                      handle_t *handle,
1490                                      struct inode *inode,
1491                                      const char *symname)
1492 {
1493         struct buffer_head **bhs = NULL;
1494         const char *c;
1495         struct super_block *sb = osb->sb;
1496         u64 p_blkno, p_blocks;
1497         int virtual, blocks, status, i, bytes_left;
1498
1499         bytes_left = i_size_read(inode) + 1;
1500         /* we can't trust i_blocks because we're actually going to
1501          * write i_size + 1 bytes. */
1502         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1503
1504         mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1505                         (unsigned long long)inode->i_blocks,
1506                         i_size_read(inode), blocks);
1507
1508         /* Sanity check -- make sure we're going to fit. */
1509         if (bytes_left >
1510             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1511                 status = -EIO;
1512                 mlog_errno(status);
1513                 goto bail;
1514         }
1515
1516         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1517         if (!bhs) {
1518                 status = -ENOMEM;
1519                 mlog_errno(status);
1520                 goto bail;
1521         }
1522
1523         status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1524                                              NULL);
1525         if (status < 0) {
1526                 mlog_errno(status);
1527                 goto bail;
1528         }
1529
1530         /* links can never be larger than one cluster so we know this
1531          * is all going to be contiguous, but do a sanity check
1532          * anyway. */
1533         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1534                 status = -EIO;
1535                 mlog_errno(status);
1536                 goto bail;
1537         }
1538
1539         virtual = 0;
1540         while(bytes_left > 0) {
1541                 c = &symname[virtual * sb->s_blocksize];
1542
1543                 bhs[virtual] = sb_getblk(sb, p_blkno);
1544                 if (!bhs[virtual]) {
1545                         status = -ENOMEM;
1546                         mlog_errno(status);
1547                         goto bail;
1548                 }
1549                 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1550                                               bhs[virtual]);
1551
1552                 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1553                                               bhs[virtual],
1554                                               OCFS2_JOURNAL_ACCESS_CREATE);
1555                 if (status < 0) {
1556                         mlog_errno(status);
1557                         goto bail;
1558                 }
1559
1560                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1561
1562                 memcpy(bhs[virtual]->b_data, c,
1563                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1564                        bytes_left);
1565
1566                 ocfs2_journal_dirty(handle, bhs[virtual]);
1567
1568                 virtual++;
1569                 p_blkno++;
1570                 bytes_left -= sb->s_blocksize;
1571         }
1572
1573         status = 0;
1574 bail:
1575
1576         if (bhs) {
1577                 for(i = 0; i < blocks; i++)
1578                         brelse(bhs[i]);
1579                 kfree(bhs);
1580         }
1581
1582         mlog_exit(status);
1583         return status;
1584 }
1585
1586 static int ocfs2_symlink(struct inode *dir,
1587                          struct dentry *dentry,
1588                          const char *symname)
1589 {
1590         int status, l, credits;
1591         u64 newsize;
1592         struct ocfs2_super *osb = NULL;
1593         struct inode *inode = NULL;
1594         struct super_block *sb;
1595         struct buffer_head *new_fe_bh = NULL;
1596         struct buffer_head *parent_fe_bh = NULL;
1597         struct ocfs2_dinode *fe = NULL;
1598         struct ocfs2_dinode *dirfe;
1599         handle_t *handle = NULL;
1600         struct ocfs2_alloc_context *inode_ac = NULL;
1601         struct ocfs2_alloc_context *data_ac = NULL;
1602         struct ocfs2_alloc_context *xattr_ac = NULL;
1603         int want_clusters = 0;
1604         int xattr_credits = 0;
1605         struct ocfs2_security_xattr_info si = {
1606                 .enable = 1,
1607         };
1608         int did_quota = 0, did_quota_inode = 0;
1609         struct ocfs2_dir_lookup_result lookup = { NULL, };
1610         sigset_t oldset;
1611         int did_block_signals = 0;
1612
1613         mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1614                    dentry, symname, dentry->d_name.len, dentry->d_name.name);
1615
1616         dquot_initialize(dir);
1617
1618         sb = dir->i_sb;
1619         osb = OCFS2_SB(sb);
1620
1621         l = strlen(symname) + 1;
1622
1623         credits = ocfs2_calc_symlink_credits(sb);
1624
1625         /* lock the parent directory */
1626         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1627         if (status < 0) {
1628                 if (status != -ENOENT)
1629                         mlog_errno(status);
1630                 return status;
1631         }
1632
1633         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1634         if (!ocfs2_read_links_count(dirfe)) {
1635                 /* can't make a file in a deleted directory. */
1636                 status = -ENOENT;
1637                 goto bail;
1638         }
1639
1640         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1641                                            dentry->d_name.len);
1642         if (status)
1643                 goto bail;
1644
1645         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1646                                               dentry->d_name.name,
1647                                               dentry->d_name.len, &lookup);
1648         if (status < 0) {
1649                 mlog_errno(status);
1650                 goto bail;
1651         }
1652
1653         status = ocfs2_reserve_new_inode(osb, &inode_ac);
1654         if (status < 0) {
1655                 if (status != -ENOSPC)
1656                         mlog_errno(status);
1657                 goto bail;
1658         }
1659
1660         inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1661         if (!inode) {
1662                 status = -ENOMEM;
1663                 mlog_errno(status);
1664                 goto bail;
1665         }
1666
1667         /* get security xattr */
1668         status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1669         if (status) {
1670                 if (status == -EOPNOTSUPP)
1671                         si.enable = 0;
1672                 else {
1673                         mlog_errno(status);
1674                         goto bail;
1675                 }
1676         }
1677
1678         /* calculate meta data/clusters for setting security xattr */
1679         if (si.enable) {
1680                 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1681                                                   &xattr_credits, &xattr_ac);
1682                 if (status < 0) {
1683                         mlog_errno(status);
1684                         goto bail;
1685                 }
1686         }
1687
1688         /* don't reserve bitmap space for fast symlinks. */
1689         if (l > ocfs2_fast_symlink_chars(sb))
1690                 want_clusters += 1;
1691
1692         status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1693         if (status < 0) {
1694                 if (status != -ENOSPC)
1695                         mlog_errno(status);
1696                 goto bail;
1697         }
1698
1699         handle = ocfs2_start_trans(osb, credits + xattr_credits);
1700         if (IS_ERR(handle)) {
1701                 status = PTR_ERR(handle);
1702                 handle = NULL;
1703                 mlog_errno(status);
1704                 goto bail;
1705         }
1706
1707         /* Starting to change things, restart is no longer possible. */
1708         ocfs2_block_signals(&oldset);
1709         did_block_signals = 1;
1710
1711         status = dquot_alloc_inode(inode);
1712         if (status)
1713                 goto bail;
1714         did_quota_inode = 1;
1715
1716         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry,
1717                    inode->i_mode, dentry->d_name.len,
1718                    dentry->d_name.name);
1719
1720         status = ocfs2_mknod_locked(osb, dir, inode,
1721                                     0, &new_fe_bh, parent_fe_bh, handle,
1722                                     inode_ac);
1723         if (status < 0) {
1724                 mlog_errno(status);
1725                 goto bail;
1726         }
1727
1728         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1729         inode->i_rdev = 0;
1730         newsize = l - 1;
1731         if (l > ocfs2_fast_symlink_chars(sb)) {
1732                 u32 offset = 0;
1733
1734                 inode->i_op = &ocfs2_symlink_inode_operations;
1735                 status = dquot_alloc_space_nodirty(inode,
1736                     ocfs2_clusters_to_bytes(osb->sb, 1));
1737                 if (status)
1738                         goto bail;
1739                 did_quota = 1;
1740                 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1741                                               new_fe_bh,
1742                                               handle, data_ac, NULL,
1743                                               NULL);
1744                 if (status < 0) {
1745                         if (status != -ENOSPC && status != -EINTR) {
1746                                 mlog(ML_ERROR,
1747                                      "Failed to extend file to %llu\n",
1748                                      (unsigned long long)newsize);
1749                                 mlog_errno(status);
1750                                 status = -ENOSPC;
1751                         }
1752                         goto bail;
1753                 }
1754                 i_size_write(inode, newsize);
1755                 inode->i_blocks = ocfs2_inode_sector_count(inode);
1756         } else {
1757                 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1758                 memcpy((char *) fe->id2.i_symlink, symname, l);
1759                 i_size_write(inode, newsize);
1760                 inode->i_blocks = 0;
1761         }
1762
1763         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1764         if (status < 0) {
1765                 mlog_errno(status);
1766                 goto bail;
1767         }
1768
1769         if (!ocfs2_inode_is_fast_symlink(inode)) {
1770                 status = ocfs2_create_symlink_data(osb, handle, inode,
1771                                                    symname);
1772                 if (status < 0) {
1773                         mlog_errno(status);
1774                         goto bail;
1775                 }
1776         }
1777
1778         if (si.enable) {
1779                 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1780                                                  xattr_ac, data_ac);
1781                 if (status < 0) {
1782                         mlog_errno(status);
1783                         goto bail;
1784                 }
1785         }
1786
1787         /*
1788          * Do this before adding the entry to the directory. We add
1789          * also set d_op after success so that ->d_iput() will cleanup
1790          * the dentry lock even if ocfs2_add_entry() fails below.
1791          */
1792         status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1793         if (status) {
1794                 mlog_errno(status);
1795                 goto bail;
1796         }
1797
1798         status = ocfs2_add_entry(handle, dentry, inode,
1799                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1800                                  &lookup);
1801         if (status < 0) {
1802                 mlog_errno(status);
1803                 goto bail;
1804         }
1805
1806         insert_inode_hash(inode);
1807         d_instantiate(dentry, inode);
1808 bail:
1809         if (status < 0 && did_quota)
1810                 dquot_free_space_nodirty(inode,
1811                                         ocfs2_clusters_to_bytes(osb->sb, 1));
1812         if (status < 0 && did_quota_inode)
1813                 dquot_free_inode(inode);
1814         if (handle)
1815                 ocfs2_commit_trans(osb, handle);
1816
1817         ocfs2_inode_unlock(dir, 1);
1818         if (did_block_signals)
1819                 ocfs2_unblock_signals(&oldset);
1820
1821         brelse(new_fe_bh);
1822         brelse(parent_fe_bh);
1823         kfree(si.name);
1824         kfree(si.value);
1825         ocfs2_free_dir_lookup_result(&lookup);
1826         if (inode_ac)
1827                 ocfs2_free_alloc_context(inode_ac);
1828         if (data_ac)
1829                 ocfs2_free_alloc_context(data_ac);
1830         if (xattr_ac)
1831                 ocfs2_free_alloc_context(xattr_ac);
1832         if ((status < 0) && inode) {
1833                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
1834                 clear_nlink(inode);
1835                 iput(inode);
1836         }
1837
1838         mlog_exit(status);
1839
1840         return status;
1841 }
1842
1843 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1844 {
1845         int status, namelen;
1846
1847         mlog_entry_void();
1848
1849         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1850                            (long long)blkno);
1851         if (namelen <= 0) {
1852                 if (namelen)
1853                         status = namelen;
1854                 else
1855                         status = -EINVAL;
1856                 mlog_errno(status);
1857                 goto bail;
1858         }
1859         if (namelen != OCFS2_ORPHAN_NAMELEN) {
1860                 status = -EINVAL;
1861                 mlog_errno(status);
1862                 goto bail;
1863         }
1864
1865         mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
1866              namelen);
1867
1868         status = 0;
1869 bail:
1870         mlog_exit(status);
1871         return status;
1872 }
1873
1874 static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
1875                                         struct inode **ret_orphan_dir,
1876                                         struct buffer_head **ret_orphan_dir_bh)
1877 {
1878         struct inode *orphan_dir_inode;
1879         struct buffer_head *orphan_dir_bh = NULL;
1880         int ret = 0;
1881
1882         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1883                                                        ORPHAN_DIR_SYSTEM_INODE,
1884                                                        osb->slot_num);
1885         if (!orphan_dir_inode) {
1886                 ret = -ENOENT;
1887                 mlog_errno(ret);
1888                 return ret;
1889         }
1890
1891         mutex_lock(&orphan_dir_inode->i_mutex);
1892
1893         ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1894         if (ret < 0) {
1895                 mutex_unlock(&orphan_dir_inode->i_mutex);
1896                 iput(orphan_dir_inode);
1897
1898                 mlog_errno(ret);
1899                 return ret;
1900         }
1901
1902         *ret_orphan_dir = orphan_dir_inode;
1903         *ret_orphan_dir_bh = orphan_dir_bh;
1904
1905         return 0;
1906 }
1907
1908 static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
1909                                       struct buffer_head *orphan_dir_bh,
1910                                       u64 blkno,
1911                                       char *name,
1912                                       struct ocfs2_dir_lookup_result *lookup)
1913 {
1914         int ret;
1915         struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
1916
1917         ret = ocfs2_blkno_stringify(blkno, name);
1918         if (ret < 0) {
1919                 mlog_errno(ret);
1920                 return ret;
1921         }
1922
1923         ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1924                                            orphan_dir_bh, name,
1925                                            OCFS2_ORPHAN_NAMELEN, lookup);
1926         if (ret < 0) {
1927                 mlog_errno(ret);
1928                 return ret;
1929         }
1930
1931         return 0;
1932 }
1933
1934 /**
1935  * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
1936  * insertion of an orphan.
1937  * @osb: ocfs2 file system
1938  * @ret_orphan_dir: Orphan dir inode - returned locked!
1939  * @blkno: Actual block number of the inode to be inserted into orphan dir.
1940  * @lookup: dir lookup result, to be passed back into functions like
1941  *          ocfs2_orphan_add
1942  *
1943  * Returns zero on success and the ret_orphan_dir, name and lookup
1944  * fields will be populated.
1945  *
1946  * Returns non-zero on failure.
1947  */
1948 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1949                                     struct inode **ret_orphan_dir,
1950                                     u64 blkno,
1951                                     char *name,
1952                                     struct ocfs2_dir_lookup_result *lookup)
1953 {
1954         struct inode *orphan_dir_inode = NULL;
1955         struct buffer_head *orphan_dir_bh = NULL;
1956         int ret = 0;
1957
1958         ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
1959                                            &orphan_dir_bh);
1960         if (ret < 0) {
1961                 mlog_errno(ret);
1962                 return ret;
1963         }
1964
1965         ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
1966                                          blkno, name, lookup);
1967         if (ret < 0) {
1968                 mlog_errno(ret);
1969                 goto out;
1970         }
1971
1972         *ret_orphan_dir = orphan_dir_inode;
1973
1974 out:
1975         brelse(orphan_dir_bh);
1976
1977         if (ret) {
1978                 ocfs2_inode_unlock(orphan_dir_inode, 1);
1979                 mutex_unlock(&orphan_dir_inode->i_mutex);
1980                 iput(orphan_dir_inode);
1981         }
1982
1983         mlog_exit(ret);
1984         return ret;
1985 }
1986
1987 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1988                             handle_t *handle,
1989                             struct inode *inode,
1990                             struct buffer_head *fe_bh,
1991                             char *name,
1992                             struct ocfs2_dir_lookup_result *lookup,
1993                             struct inode *orphan_dir_inode)
1994 {
1995         struct buffer_head *orphan_dir_bh = NULL;
1996         int status = 0;
1997         struct ocfs2_dinode *orphan_fe;
1998         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1999
2000         mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2001
2002         status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
2003         if (status < 0) {
2004                 mlog_errno(status);
2005                 goto leave;
2006         }
2007
2008         status = ocfs2_journal_access_di(handle,
2009                                          INODE_CACHE(orphan_dir_inode),
2010                                          orphan_dir_bh,
2011                                          OCFS2_JOURNAL_ACCESS_WRITE);
2012         if (status < 0) {
2013                 mlog_errno(status);
2014                 goto leave;
2015         }
2016
2017         /* we're a cluster, and nlink can change on disk from
2018          * underneath us... */
2019         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2020         if (S_ISDIR(inode->i_mode))
2021                 ocfs2_add_links_count(orphan_fe, 1);
2022         orphan_dir_inode->i_nlink = ocfs2_read_links_count(orphan_fe);
2023         ocfs2_journal_dirty(handle, orphan_dir_bh);
2024
2025         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2026                                    OCFS2_ORPHAN_NAMELEN, inode,
2027                                    OCFS2_I(inode)->ip_blkno,
2028                                    orphan_dir_bh, lookup);
2029         if (status < 0) {
2030                 mlog_errno(status);
2031                 goto leave;
2032         }
2033
2034         /*
2035          * We're going to journal the change of i_flags and i_orphaned_slot.
2036          * It's safe anyway, though some callers may duplicate the journaling.
2037          * Journaling within the func just make the logic look more
2038          * straightforward.
2039          */
2040         status = ocfs2_journal_access_di(handle,
2041                                          INODE_CACHE(inode),
2042                                          fe_bh,
2043                                          OCFS2_JOURNAL_ACCESS_WRITE);
2044         if (status < 0) {
2045                 mlog_errno(status);
2046                 goto leave;
2047         }
2048
2049         le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2050         OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
2051
2052         /* Record which orphan dir our inode now resides
2053          * in. delete_inode will use this to determine which orphan
2054          * dir to lock. */
2055         fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2056
2057         ocfs2_journal_dirty(handle, fe_bh);
2058
2059         mlog(0, "Inode %llu orphaned in slot %d\n",
2060              (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
2061
2062 leave:
2063         brelse(orphan_dir_bh);
2064
2065         mlog_exit(status);
2066         return status;
2067 }
2068
2069 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2070 int ocfs2_orphan_del(struct ocfs2_super *osb,
2071                      handle_t *handle,
2072                      struct inode *orphan_dir_inode,
2073                      struct inode *inode,
2074                      struct buffer_head *orphan_dir_bh)
2075 {
2076         char name[OCFS2_ORPHAN_NAMELEN + 1];
2077         struct ocfs2_dinode *orphan_fe;
2078         int status = 0;
2079         struct ocfs2_dir_lookup_result lookup = { NULL, };
2080
2081         mlog_entry_void();
2082
2083         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2084         if (status < 0) {
2085                 mlog_errno(status);
2086                 goto leave;
2087         }
2088
2089         mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
2090              name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2091              OCFS2_ORPHAN_NAMELEN);
2092
2093         /* find it's spot in the orphan directory */
2094         status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode,
2095                                   &lookup);
2096         if (status) {
2097                 mlog_errno(status);
2098                 goto leave;
2099         }
2100
2101         /* remove it from the orphan directory */
2102         status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2103         if (status < 0) {
2104                 mlog_errno(status);
2105                 goto leave;
2106         }
2107
2108         status = ocfs2_journal_access_di(handle,
2109                                          INODE_CACHE(orphan_dir_inode),
2110                                          orphan_dir_bh,
2111                                          OCFS2_JOURNAL_ACCESS_WRITE);
2112         if (status < 0) {
2113                 mlog_errno(status);
2114                 goto leave;
2115         }
2116
2117         /* do the i_nlink dance! :) */
2118         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2119         if (S_ISDIR(inode->i_mode))
2120                 ocfs2_add_links_count(orphan_fe, -1);
2121         orphan_dir_inode->i_nlink = ocfs2_read_links_count(orphan_fe);
2122         ocfs2_journal_dirty(handle, orphan_dir_bh);
2123
2124 leave:
2125         ocfs2_free_dir_lookup_result(&lookup);
2126
2127         mlog_exit(status);
2128         return status;
2129 }
2130
2131 /**
2132  * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to recieve a newly
2133  * allocated file. This is different from the typical 'add to orphan dir'
2134  * operation in that the inode does not yet exist. This is a problem because
2135  * the orphan dir stringifies the inode block number to come up with it's
2136  * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2137  * problem. This function works around it by calling deeper into the orphan
2138  * and suballoc code than other callers. Use this only by necessity.
2139  * @dir: The directory which this inode will ultimately wind up under - not the
2140  * orphan dir!
2141  * @dir_bh: buffer_head the @dir inode block
2142  * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2143  * with the string to be used for orphan dirent. Pass back to the orphan dir
2144  * code.
2145  * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2146  * dir code.
2147  * @ret_di_blkno: block number where the new inode will be allocated.
2148  * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2149  * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2150  *
2151  * Returns zero on success and the ret_orphan_dir, name and lookup
2152  * fields will be populated.
2153  *
2154  * Returns non-zero on failure.
2155  */
2156 static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2157                                         struct buffer_head *dir_bh,
2158                                         char *orphan_name,
2159                                         struct inode **ret_orphan_dir,
2160                                         u64 *ret_di_blkno,
2161                                         struct ocfs2_dir_lookup_result *orphan_insert,
2162                                         struct ocfs2_alloc_context **ret_inode_ac)
2163 {
2164         int ret;
2165         u64 di_blkno;
2166         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2167         struct inode *orphan_dir = NULL;
2168         struct buffer_head *orphan_dir_bh = NULL;
2169         struct ocfs2_alloc_context *inode_ac = NULL;
2170
2171         ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2172         if (ret < 0) {
2173                 mlog_errno(ret);
2174                 return ret;
2175         }
2176
2177         /* reserve an inode spot */
2178         ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2179         if (ret < 0) {
2180                 if (ret != -ENOSPC)
2181                         mlog_errno(ret);
2182                 goto out;
2183         }
2184
2185         ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2186                                        &di_blkno);
2187         if (ret) {
2188                 mlog_errno(ret);
2189                 goto out;
2190         }
2191
2192         ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2193                                          di_blkno, orphan_name, orphan_insert);
2194         if (ret < 0) {
2195                 mlog_errno(ret);
2196                 goto out;
2197         }
2198
2199 out:
2200         if (ret == 0) {
2201                 *ret_orphan_dir = orphan_dir;
2202                 *ret_di_blkno = di_blkno;
2203                 *ret_inode_ac = inode_ac;
2204                 /*
2205                  * orphan_name and orphan_insert are already up to
2206                  * date via prepare_orphan_dir
2207                  */
2208         } else {
2209                 /* Unroll reserve_new_inode* */
2210                 if (inode_ac)
2211                         ocfs2_free_alloc_context(inode_ac);
2212
2213                 /* Unroll orphan dir locking */
2214                 mutex_unlock(&orphan_dir->i_mutex);
2215                 ocfs2_inode_unlock(orphan_dir, 1);
2216                 iput(orphan_dir);
2217         }
2218
2219         brelse(orphan_dir_bh);
2220
2221         return 0;
2222 }
2223
2224 int ocfs2_create_inode_in_orphan(struct inode *dir,
2225                                  int mode,
2226                                  struct inode **new_inode)
2227 {
2228         int status, did_quota_inode = 0;
2229         struct inode *inode = NULL;
2230         struct inode *orphan_dir = NULL;
2231         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2232         struct ocfs2_dinode *di = NULL;
2233         handle_t *handle = NULL;
2234         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2235         struct buffer_head *parent_di_bh = NULL;
2236         struct buffer_head *new_di_bh = NULL;
2237         struct ocfs2_alloc_context *inode_ac = NULL;
2238         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2239         u64 uninitialized_var(di_blkno), suballoc_loc;
2240         u16 suballoc_bit;
2241
2242         status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2243         if (status < 0) {
2244                 if (status != -ENOENT)
2245                         mlog_errno(status);
2246                 return status;
2247         }
2248
2249         status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2250                                               orphan_name, &orphan_dir,
2251                                               &di_blkno, &orphan_insert, &inode_ac);
2252         if (status < 0) {
2253                 if (status != -ENOSPC)
2254                         mlog_errno(status);
2255                 goto leave;
2256         }
2257
2258         inode = ocfs2_get_init_inode(dir, mode);
2259         if (!inode) {
2260                 status = -ENOMEM;
2261                 mlog_errno(status);
2262                 goto leave;
2263         }
2264
2265         handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2266         if (IS_ERR(handle)) {
2267                 status = PTR_ERR(handle);
2268                 handle = NULL;
2269                 mlog_errno(status);
2270                 goto leave;
2271         }
2272
2273         status = dquot_alloc_inode(inode);
2274         if (status)
2275                 goto leave;
2276         did_quota_inode = 1;
2277
2278         status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2279                                               &suballoc_loc,
2280                                               &suballoc_bit, di_blkno);
2281         if (status < 0) {
2282                 mlog_errno(status);
2283                 goto leave;
2284         }
2285
2286         inode->i_nlink = 0;
2287         /* do the real work now. */
2288         status = __ocfs2_mknod_locked(dir, inode,
2289                                       0, &new_di_bh, parent_di_bh, handle,
2290                                       inode_ac, di_blkno, suballoc_loc,
2291                                       suballoc_bit);
2292         if (status < 0) {
2293                 mlog_errno(status);
2294                 goto leave;
2295         }
2296
2297         di = (struct ocfs2_dinode *)new_di_bh->b_data;
2298         status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2299                                   &orphan_insert, orphan_dir);
2300         if (status < 0) {
2301                 mlog_errno(status);
2302                 goto leave;
2303         }
2304
2305         /* get open lock so that only nodes can't remove it from orphan dir. */
2306         status = ocfs2_open_lock(inode);
2307         if (status < 0)
2308                 mlog_errno(status);
2309
2310         insert_inode_hash(inode);
2311 leave:
2312         if (status < 0 && did_quota_inode)
2313                 dquot_free_inode(inode);
2314         if (handle)
2315                 ocfs2_commit_trans(osb, handle);
2316
2317         if (orphan_dir) {
2318                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2319                 ocfs2_inode_unlock(orphan_dir, 1);
2320                 mutex_unlock(&orphan_dir->i_mutex);
2321                 iput(orphan_dir);
2322         }
2323
2324         if (status == -ENOSPC)
2325                 mlog(0, "Disk is full\n");
2326
2327         if ((status < 0) && inode) {
2328                 clear_nlink(inode);
2329                 iput(inode);
2330         }
2331
2332         if (inode_ac)
2333                 ocfs2_free_alloc_context(inode_ac);
2334
2335         brelse(new_di_bh);
2336
2337         if (!status)
2338                 *new_inode = inode;
2339
2340         ocfs2_free_dir_lookup_result(&orphan_insert);
2341
2342         ocfs2_inode_unlock(dir, 1);
2343         brelse(parent_di_bh);
2344         return status;
2345 }
2346
2347 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2348                                    struct inode *inode,
2349                                    struct dentry *dentry)
2350 {
2351         int status = 0;
2352         struct buffer_head *parent_di_bh = NULL;
2353         handle_t *handle = NULL;
2354         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2355         struct ocfs2_dinode *dir_di, *di;
2356         struct inode *orphan_dir_inode = NULL;
2357         struct buffer_head *orphan_dir_bh = NULL;
2358         struct buffer_head *di_bh = NULL;
2359         struct ocfs2_dir_lookup_result lookup = { NULL, };
2360
2361         mlog_entry("(0x%p, 0x%p, %.*s')\n", dir, dentry,
2362                    dentry->d_name.len, dentry->d_name.name);
2363
2364         status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2365         if (status < 0) {
2366                 if (status != -ENOENT)
2367                         mlog_errno(status);
2368                 return status;
2369         }
2370
2371         dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2372         if (!dir_di->i_links_count) {
2373                 /* can't make a file in a deleted directory. */
2374                 status = -ENOENT;
2375                 goto leave;
2376         }
2377
2378         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2379                                            dentry->d_name.len);
2380         if (status)
2381                 goto leave;
2382
2383         /* get a spot inside the dir. */
2384         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2385                                               dentry->d_name.name,
2386                                               dentry->d_name.len, &lookup);
2387         if (status < 0) {
2388                 mlog_errno(status);
2389                 goto leave;
2390         }
2391
2392         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2393                                                        ORPHAN_DIR_SYSTEM_INODE,
2394                                                        osb->slot_num);
2395         if (!orphan_dir_inode) {
2396                 status = -EEXIST;
2397                 mlog_errno(status);
2398                 goto leave;
2399         }
2400
2401         mutex_lock(&orphan_dir_inode->i_mutex);
2402
2403         status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2404         if (status < 0) {
2405                 mlog_errno(status);
2406                 mutex_unlock(&orphan_dir_inode->i_mutex);
2407                 iput(orphan_dir_inode);
2408                 goto leave;
2409         }
2410
2411         status = ocfs2_read_inode_block(inode, &di_bh);
2412         if (status < 0) {
2413                 mlog_errno(status);
2414                 goto orphan_unlock;
2415         }
2416
2417         handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2418         if (IS_ERR(handle)) {
2419                 status = PTR_ERR(handle);
2420                 handle = NULL;
2421                 mlog_errno(status);
2422                 goto orphan_unlock;
2423         }
2424
2425         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2426                                          di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2427         if (status < 0) {
2428                 mlog_errno(status);
2429                 goto out_commit;
2430         }
2431
2432         status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2433                                   orphan_dir_bh);
2434         if (status < 0) {
2435                 mlog_errno(status);
2436                 goto out_commit;
2437         }
2438
2439         di = (struct ocfs2_dinode *)di_bh->b_data;
2440         le32_add_cpu(&di->i_flags, -OCFS2_ORPHANED_FL);
2441         di->i_orphaned_slot = 0;
2442         inode->i_nlink = 1;
2443         ocfs2_set_links_count(di, inode->i_nlink);
2444         ocfs2_journal_dirty(handle, di_bh);
2445
2446         status = ocfs2_add_entry(handle, dentry, inode,
2447                                  OCFS2_I(inode)->ip_blkno, parent_di_bh,
2448                                  &lookup);
2449         if (status < 0) {
2450                 mlog_errno(status);
2451                 goto out_commit;
2452         }
2453
2454         status = ocfs2_dentry_attach_lock(dentry, inode,
2455                                           OCFS2_I(dir)->ip_blkno);
2456         if (status) {
2457                 mlog_errno(status);
2458                 goto out_commit;
2459         }
2460
2461         d_instantiate(dentry, inode);
2462         status = 0;
2463 out_commit:
2464         ocfs2_commit_trans(osb, handle);
2465 orphan_unlock:
2466         ocfs2_inode_unlock(orphan_dir_inode, 1);
2467         mutex_unlock(&orphan_dir_inode->i_mutex);
2468         iput(orphan_dir_inode);
2469 leave:
2470
2471         ocfs2_inode_unlock(dir, 1);
2472
2473         brelse(di_bh);
2474         brelse(parent_di_bh);
2475         brelse(orphan_dir_bh);
2476
2477         ocfs2_free_dir_lookup_result(&lookup);
2478
2479         mlog_exit(status);
2480
2481         return status;
2482 }
2483
2484 const struct inode_operations ocfs2_dir_iops = {
2485         .create         = ocfs2_create,
2486         .lookup         = ocfs2_lookup,
2487         .link           = ocfs2_link,
2488         .unlink         = ocfs2_unlink,
2489         .rmdir          = ocfs2_unlink,
2490         .symlink        = ocfs2_symlink,
2491         .mkdir          = ocfs2_mkdir,
2492         .mknod          = ocfs2_mknod,
2493         .rename         = ocfs2_rename,
2494         .setattr        = ocfs2_setattr,
2495         .getattr        = ocfs2_getattr,
2496         .permission     = ocfs2_permission,
2497         .setxattr       = generic_setxattr,
2498         .getxattr       = generic_getxattr,
2499         .listxattr      = ocfs2_listxattr,
2500         .removexattr    = generic_removexattr,
2501         .fiemap         = ocfs2_fiemap,
2502 };