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 #include <cluster/masklog.h>
  46
  47 #include "ocfs2.h"
  48
  49 #include "alloc.h"
  50 #include "dcache.h"
  51 #include "dir.h"
  52 #include "dlmglue.h"
  53 #include "extent_map.h"
  54 #include "file.h"
  55 #include "inode.h"
  56 #include "journal.h"
  57 #include "namei.h"
  58 #include "suballoc.h"
  59 #include "super.h"
  60 #include "symlink.h"
  61 #include "sysfile.h"
  62 #include "uptodate.h"
  63 #include "xattr.h"
  64 #include "acl.h"
  65 #include "ocfs2_trace.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                                     bool dio);
  84
  85 static int ocfs2_orphan_add(struct ocfs2_super *osb,
  86                             handle_t *handle,
  87                             struct inode *inode,
  88                             struct buffer_head *fe_bh,
  89                             char *name,
  90                             struct ocfs2_dir_lookup_result *lookup,
  91                             struct inode *orphan_dir_inode,
  92                             bool dio);
  93
  94 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
  95                                      handle_t *handle,
  96                                      struct inode *inode,
  97                                      const char *symname);
  98
  99 static int ocfs2_double_lock(struct ocfs2_super *osb,
 100                              struct buffer_head **bh1,
 101                              struct inode *inode1,
 102                              struct buffer_head **bh2,
 103                              struct inode *inode2,
 104                              int rename);
 105
 106 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2);
 107 /* An orphan dir name is an 8 byte value, printed as a hex string */
 108 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
 109 #define OCFS2_DIO_ORPHAN_PREFIX "dio-"
 110 #define OCFS2_DIO_ORPHAN_PREFIX_LEN 4
 111
 112 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
 113                                    unsigned int flags)
 114 {
 115         int status;
 116         u64 blkno;
 117         struct inode *inode = NULL;
 118         struct dentry *ret;
 119         struct ocfs2_inode_info *oi;
 120
 121         trace_ocfs2_lookup(dir, dentry, dentry->d_name.len,
 122                            dentry->d_name.name,
 123                            (unsigned long long)OCFS2_I(dir)->ip_blkno, 0);
 124
 125         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
 126                 ret = ERR_PTR(-ENAMETOOLONG);
 127                 goto bail;
 128         }
 129
 130         status = ocfs2_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT);
 131         if (status < 0) {
 132                 if (status != -ENOENT)
 133                         mlog_errno(status);
 134                 ret = ERR_PTR(status);
 135                 goto bail;
 136         }
 137
 138         status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
 139                                             dentry->d_name.len, &blkno);
 140         if (status < 0)
 141                 goto bail_add;
 142
 143         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
 144         if (IS_ERR(inode)) {
 145                 ret = ERR_PTR(-EACCES);
 146                 goto bail_unlock;
 147         }
 148
 149         oi = OCFS2_I(inode);
 150         /* Clear any orphaned state... If we were able to look up the
 151          * inode from a directory, it certainly can't be orphaned. We
 152          * might have the bad state from a node which intended to
 153          * orphan this inode but crashed before it could commit the
 154          * unlink. */
 155         spin_lock(&oi->ip_lock);
 156         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
 157         spin_unlock(&oi->ip_lock);
 158
 159 bail_add:
 160         ret = d_splice_alias(inode, dentry);
 161
 162         if (inode) {
 163                 /*
 164                  * If d_splice_alias() finds a DCACHE_DISCONNECTED
 165                  * dentry, it will d_move() it on top of ourse. The
 166                  * return value will indicate this however, so in
 167                  * those cases, we switch them around for the locking
 168                  * code.
 169                  *
 170                  * NOTE: This dentry already has ->d_op set from
 171                  * ocfs2_get_parent() and ocfs2_get_dentry()
 172                  */
 173                 if (!IS_ERR_OR_NULL(ret))
 174                         dentry = ret;
 175
 176                 status = ocfs2_dentry_attach_lock(dentry, inode,
 177                                                   OCFS2_I(dir)->ip_blkno);
 178                 if (status) {
 179                         mlog_errno(status);
 180                         ret = ERR_PTR(status);
 181                         goto bail_unlock;
 182                 }
 183         } else
 184                 ocfs2_dentry_attach_gen(dentry);
 185
 186 bail_unlock:
 187         /* Don't drop the cluster lock until *after* the d_add --
 188          * unlink on another node will message us to remove that
 189          * dentry under this lock so otherwise we can race this with
 190          * the downconvert thread and have a stale dentry. */
 191         ocfs2_inode_unlock(dir, 0);
 192
 193 bail:
 194
 195         trace_ocfs2_lookup_ret(ret);
 196
 197         return ret;
 198 }
 199
 200 static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t mode)
 201 {
 202         struct inode *inode;
 203
 204         inode = new_inode(dir->i_sb);
 205         if (!inode) {
 206                 mlog(ML_ERROR, "new_inode failed!\n");
 207                 return NULL;
 208         }
 209
 210         /* populate as many fields early on as possible - many of
 211          * these are used by the support functions here and in
 212          * callers. */
 213         if (S_ISDIR(mode))
 214                 set_nlink(inode, 2);
 215         inode_init_owner(inode, dir, mode);
 216         dquot_initialize(inode);
 217         return inode;
 218 }
 219
 220 static void ocfs2_cleanup_add_entry_failure(struct ocfs2_super *osb,
 221                 struct dentry *dentry, struct inode *inode)
 222 {
 223         struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
 224
 225         ocfs2_simple_drop_lockres(osb, &dl->dl_lockres);
 226         ocfs2_lock_res_free(&dl->dl_lockres);
 227         BUG_ON(dl->dl_count != 1);
 228         spin_lock(&dentry_attach_lock);
 229         dentry->d_fsdata = NULL;
 230         spin_unlock(&dentry_attach_lock);
 231         kfree(dl);
 232         iput(inode);
 233 }
 234
 235 static int ocfs2_mknod(struct inode *dir,
 236                        struct dentry *dentry,
 237                        umode_t mode,
 238                        dev_t dev)
 239 {
 240         int status = 0;
 241         struct buffer_head *parent_fe_bh = NULL;
 242         handle_t *handle = NULL;
 243         struct ocfs2_super *osb;
 244         struct ocfs2_dinode *dirfe;
 245         struct buffer_head *new_fe_bh = NULL;
 246         struct inode *inode = NULL;
 247         struct ocfs2_alloc_context *inode_ac = NULL;
 248         struct ocfs2_alloc_context *data_ac = NULL;
 249         struct ocfs2_alloc_context *meta_ac = NULL;
 250         int want_clusters = 0;
 251         int want_meta = 0;
 252         int xattr_credits = 0;
 253         struct ocfs2_security_xattr_info si = {
 254                 .enable = 1,
 255         };
 256         int did_quota_inode = 0;
 257         struct ocfs2_dir_lookup_result lookup = { NULL, };
 258         sigset_t oldset;
 259         int did_block_signals = 0;
 260         struct posix_acl *default_acl = NULL, *acl = NULL;
 261         struct ocfs2_dentry_lock *dl = NULL;
 262
 263         trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 264                           (unsigned long long)OCFS2_I(dir)->ip_blkno,
 265                           (unsigned long)dev, mode);
 266
 267         dquot_initialize(dir);
 268
 269         /* get our super block */
 270         osb = OCFS2_SB(dir->i_sb);
 271
 272         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
 273         if (status < 0) {
 274                 if (status != -ENOENT)
 275                         mlog_errno(status);
 276                 return status;
 277         }
 278
 279         if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
 280                 status = -EMLINK;
 281                 goto leave;
 282         }
 283
 284         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
 285         if (!ocfs2_read_links_count(dirfe)) {
 286                 /* can't make a file in a deleted directory. */
 287                 status = -ENOENT;
 288                 goto leave;
 289         }
 290
 291         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 292                                            dentry->d_name.len);
 293         if (status)
 294                 goto leave;
 295
 296         /* get a spot inside the dir. */
 297         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 298                                               dentry->d_name.name,
 299                                               dentry->d_name.len, &lookup);
 300         if (status < 0) {
 301                 mlog_errno(status);
 302                 goto leave;
 303         }
 304
 305         /* reserve an inode spot */
 306         status = ocfs2_reserve_new_inode(osb, &inode_ac);
 307         if (status < 0) {
 308                 if (status != -ENOSPC)
 309                         mlog_errno(status);
 310                 goto leave;
 311         }
 312
 313         inode = ocfs2_get_init_inode(dir, mode);
 314         if (!inode) {
 315                 status = -ENOMEM;
 316                 mlog_errno(status);
 317                 goto leave;
 318         }
 319
 320         /* get security xattr */
 321         status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
 322         if (status) {
 323                 if (status == -EOPNOTSUPP)
 324                         si.enable = 0;
 325                 else {
 326                         mlog_errno(status);
 327                         goto leave;
 328                 }
 329         }
 330
 331         /* calculate meta data/clusters for setting security and acl xattr */
 332         status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
 333                                        &si, &want_clusters,
 334                                        &xattr_credits, &want_meta);
 335         if (status < 0) {
 336                 mlog_errno(status);
 337                 goto leave;
 338         }
 339
 340         /* Reserve a cluster if creating an extent based directory. */
 341         if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
 342                 want_clusters += 1;
 343
 344                 /* Dir indexing requires extra space as well */
 345                 if (ocfs2_supports_indexed_dirs(osb))
 346                         want_meta++;
 347         }
 348
 349         status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
 350         if (status < 0) {
 351                 if (status != -ENOSPC)
 352                         mlog_errno(status);
 353                 goto leave;
 354         }
 355
 356         status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
 357         if (status < 0) {
 358                 if (status != -ENOSPC)
 359                         mlog_errno(status);
 360                 goto leave;
 361         }
 362
 363         status = posix_acl_create(dir, &mode, &default_acl, &acl);
 364         if (status) {
 365                 mlog_errno(status);
 366                 goto leave;
 367         }
 368
 369         handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
 370                                                             S_ISDIR(mode),
 371                                                             xattr_credits));
 372         if (IS_ERR(handle)) {
 373                 status = PTR_ERR(handle);
 374                 handle = NULL;
 375                 mlog_errno(status);
 376                 goto leave;
 377         }
 378
 379         /* Starting to change things, restart is no longer possible. */
 380         ocfs2_block_signals(&oldset);
 381         did_block_signals = 1;
 382
 383         status = dquot_alloc_inode(inode);
 384         if (status)
 385                 goto leave;
 386         did_quota_inode = 1;
 387
 388         /* do the real work now. */
 389         status = ocfs2_mknod_locked(osb, dir, inode, dev,
 390                                     &new_fe_bh, parent_fe_bh, handle,
 391                                     inode_ac);
 392         if (status < 0) {
 393                 mlog_errno(status);
 394                 goto leave;
 395         }
 396
 397         if (S_ISDIR(mode)) {
 398                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 399                                             new_fe_bh, data_ac, meta_ac);
 400                 if (status < 0) {
 401                         mlog_errno(status);
 402                         goto leave;
 403                 }
 404
 405                 status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
 406                                                  parent_fe_bh,
 407                                                  OCFS2_JOURNAL_ACCESS_WRITE);
 408                 if (status < 0) {
 409                         mlog_errno(status);
 410                         goto leave;
 411                 }
 412                 ocfs2_add_links_count(dirfe, 1);
 413                 ocfs2_journal_dirty(handle, parent_fe_bh);
 414                 inc_nlink(dir);
 415         }
 416
 417         if (default_acl) {
 418                 status = ocfs2_set_acl(handle, inode, new_fe_bh,
 419                                        ACL_TYPE_DEFAULT, default_acl,
 420                                        meta_ac, data_ac);
 421         }
 422         if (!status && acl) {
 423                 status = ocfs2_set_acl(handle, inode, new_fe_bh,
 424                                        ACL_TYPE_ACCESS, acl,
 425                                        meta_ac, data_ac);
 426         }
 427
 428         if (status < 0) {
 429                 mlog_errno(status);
 430                 goto leave;
 431         }
 432
 433         if (si.enable) {
 434                 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
 435                                                  meta_ac, data_ac);
 436                 if (status < 0) {
 437                         mlog_errno(status);
 438                         goto leave;
 439                 }
 440         }
 441
 442         /*
 443          * Do this before adding the entry to the directory. We add
 444          * also set d_op after success so that ->d_iput() will cleanup
 445          * the dentry lock even if ocfs2_add_entry() fails below.
 446          */
 447         status = ocfs2_dentry_attach_lock(dentry, inode,
 448                                           OCFS2_I(dir)->ip_blkno);
 449         if (status) {
 450                 mlog_errno(status);
 451                 goto leave;
 452         }
 453
 454         dl = dentry->d_fsdata;
 455
 456         status = ocfs2_add_entry(handle, dentry, inode,
 457                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
 458                                  &lookup);
 459         if (status < 0) {
 460                 mlog_errno(status);
 461                 goto leave;
 462         }
 463
 464         insert_inode_hash(inode);
 465         d_instantiate(dentry, inode);
 466         status = 0;
 467 leave:
 468         if (default_acl)
 469                 posix_acl_release(default_acl);
 470         if (acl)
 471                 posix_acl_release(acl);
 472         if (status < 0 && did_quota_inode)
 473                 dquot_free_inode(inode);
 474         if (handle)
 475                 ocfs2_commit_trans(osb, handle);
 476
 477         ocfs2_inode_unlock(dir, 1);
 478         if (did_block_signals)
 479                 ocfs2_unblock_signals(&oldset);
 480
 481         brelse(new_fe_bh);
 482         brelse(parent_fe_bh);
 483         kfree(si.value);
 484
 485         ocfs2_free_dir_lookup_result(&lookup);
 486
 487         if (inode_ac)
 488                 ocfs2_free_alloc_context(inode_ac);
 489
 490         if (data_ac)
 491                 ocfs2_free_alloc_context(data_ac);
 492
 493         if (meta_ac)
 494                 ocfs2_free_alloc_context(meta_ac);
 495
 496         /*
 497          * We should call iput after the i_mutex of the bitmap been
 498          * unlocked in ocfs2_free_alloc_context, or the
 499          * ocfs2_delete_inode will mutex_lock again.
 500          */
 501         if ((status < 0) && inode) {
 502                 if (dl)
 503                         ocfs2_cleanup_add_entry_failure(osb, dentry, inode);
 504
 505                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
 506                 clear_nlink(inode);
 507                 iput(inode);
 508         }
 509
 510         if (status)
 511                 mlog_errno(status);
 512
 513         return status;
 514 }
 515
 516 static int __ocfs2_mknod_locked(struct inode *dir,
 517                                 struct inode *inode,
 518                                 dev_t dev,
 519                                 struct buffer_head **new_fe_bh,
 520                                 struct buffer_head *parent_fe_bh,
 521                                 handle_t *handle,
 522                                 struct ocfs2_alloc_context *inode_ac,
 523                                 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
 524 {
 525         int status = 0;
 526         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 527         struct ocfs2_dinode *fe = NULL;
 528         struct ocfs2_extent_list *fel;
 529         u16 feat;
 530         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 531
 532         *new_fe_bh = NULL;
 533
 534         /* populate as many fields early on as possible - many of
 535          * these are used by the support functions here and in
 536          * callers. */
 537         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
 538         OCFS2_I(inode)->ip_blkno = fe_blkno;
 539         spin_lock(&osb->osb_lock);
 540         inode->i_generation = osb->s_next_generation++;
 541         spin_unlock(&osb->osb_lock);
 542
 543         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
 544         if (!*new_fe_bh) {
 545                 status = -ENOMEM;
 546                 mlog_errno(status);
 547                 goto leave;
 548         }
 549         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
 550
 551         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
 552                                          *new_fe_bh,
 553                                          OCFS2_JOURNAL_ACCESS_CREATE);
 554         if (status < 0) {
 555                 mlog_errno(status);
 556                 goto leave;
 557         }
 558
 559         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
 560         memset(fe, 0, osb->sb->s_blocksize);
 561
 562         fe->i_generation = cpu_to_le32(inode->i_generation);
 563         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
 564         fe->i_blkno = cpu_to_le64(fe_blkno);
 565         fe->i_suballoc_loc = cpu_to_le64(suballoc_loc);
 566         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
 567         fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
 568         fe->i_uid = cpu_to_le32(i_uid_read(inode));
 569         fe->i_gid = cpu_to_le32(i_gid_read(inode));
 570         fe->i_mode = cpu_to_le16(inode->i_mode);
 571         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 572                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
 573
 574         ocfs2_set_links_count(fe, inode->i_nlink);
 575
 576         fe->i_last_eb_blk = 0;
 577         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
 578         fe->i_flags |= cpu_to_le32(OCFS2_VALID_FL);
 579         fe->i_atime = fe->i_ctime = fe->i_mtime =
 580                 cpu_to_le64(CURRENT_TIME.tv_sec);
 581         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
 582                 cpu_to_le32(CURRENT_TIME.tv_nsec);
 583         fe->i_dtime = 0;
 584
 585         /*
 586          * If supported, directories start with inline data. If inline
 587          * isn't supported, but indexing is, we start them as indexed.
 588          */
 589         feat = le16_to_cpu(fe->i_dyn_features);
 590         if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
 591                 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
 592
 593                 fe->id2.i_data.id_count = cpu_to_le16(
 594                                 ocfs2_max_inline_data_with_xattr(osb->sb, fe));
 595         } else {
 596                 fel = &fe->id2.i_list;
 597                 fel->l_tree_depth = 0;
 598                 fel->l_next_free_rec = 0;
 599                 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
 600         }
 601
 602         ocfs2_journal_dirty(handle, *new_fe_bh);
 603
 604         ocfs2_populate_inode(inode, fe, 1);
 605         ocfs2_ci_set_new(osb, INODE_CACHE(inode));
 606         if (!ocfs2_mount_local(osb)) {
 607                 status = ocfs2_create_new_inode_locks(inode);
 608                 if (status < 0)
 609                         mlog_errno(status);
 610         }
 611
 612         oi->i_sync_tid = handle->h_transaction->t_tid;
 613         oi->i_datasync_tid = handle->h_transaction->t_tid;
 614
 615 leave:
 616         if (status < 0) {
 617                 if (*new_fe_bh) {
 618                         brelse(*new_fe_bh);
 619                         *new_fe_bh = NULL;
 620                 }
 621         }
 622
 623         if (status)
 624                 mlog_errno(status);
 625         return status;
 626 }
 627
 628 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 629                               struct inode *dir,
 630                               struct inode *inode,
 631                               dev_t dev,
 632                               struct buffer_head **new_fe_bh,
 633                               struct buffer_head *parent_fe_bh,
 634                               handle_t *handle,
 635                               struct ocfs2_alloc_context *inode_ac)
 636 {
 637         int status = 0;
 638         u64 suballoc_loc, fe_blkno = 0;
 639         u16 suballoc_bit;
 640
 641         *new_fe_bh = NULL;
 642
 643         status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
 644                                        inode_ac, &suballoc_loc,
 645                                        &suballoc_bit, &fe_blkno);
 646         if (status < 0) {
 647                 mlog_errno(status);
 648                 return status;
 649         }
 650
 651         return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
 652                                     parent_fe_bh, handle, inode_ac,
 653                                     fe_blkno, suballoc_loc, suballoc_bit);
 654 }
 655
 656 static int ocfs2_mkdir(struct inode *dir,
 657                        struct dentry *dentry,
 658                        umode_t mode)
 659 {
 660         int ret;
 661
 662         trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 663                           OCFS2_I(dir)->ip_blkno, mode);
 664         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
 665         if (ret)
 666                 mlog_errno(ret);
 667
 668         return ret;
 669 }
 670
 671 static int ocfs2_create(struct inode *dir,
 672                         struct dentry *dentry,
 673                         umode_t mode,
 674                         bool excl)
 675 {
 676         int ret;
 677
 678         trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 679                            (unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
 680         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
 681         if (ret)
 682                 mlog_errno(ret);
 683
 684         return ret;
 685 }
 686
 687 static int ocfs2_link(struct dentry *old_dentry,
 688                       struct inode *dir,
 689                       struct dentry *dentry)
 690 {
 691         handle_t *handle;
 692         struct inode *inode = d_inode(old_dentry);
 693         struct inode *old_dir = d_inode(old_dentry->d_parent);
 694         int err;
 695         struct buffer_head *fe_bh = NULL;
 696         struct buffer_head *old_dir_bh = NULL;
 697         struct buffer_head *parent_fe_bh = NULL;
 698         struct ocfs2_dinode *fe = NULL;
 699         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 700         struct ocfs2_dir_lookup_result lookup = { NULL, };
 701         sigset_t oldset;
 702         u64 old_de_ino;
 703
 704         trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
 705                          old_dentry->d_name.len, old_dentry->d_name.name,
 706                          dentry->d_name.len, dentry->d_name.name);
 707
 708         if (S_ISDIR(inode->i_mode))
 709                 return -EPERM;
 710
 711         dquot_initialize(dir);
 712
 713         err = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
 714                         &parent_fe_bh, dir, 0);
 715         if (err < 0) {
 716                 if (err != -ENOENT)
 717                         mlog_errno(err);
 718                 return err;
 719         }
 720
 721         /* make sure both dirs have bhs
 722          * get an extra ref on old_dir_bh if old==new */
 723         if (!parent_fe_bh) {
 724                 if (old_dir_bh) {
 725                         parent_fe_bh = old_dir_bh;
 726                         get_bh(parent_fe_bh);
 727                 } else {
 728                         mlog(ML_ERROR, "%s: no old_dir_bh!\n", osb->uuid_str);
 729                         err = -EIO;
 730                         goto out;
 731                 }
 732         }
 733
 734         if (!dir->i_nlink) {
 735                 err = -ENOENT;
 736                 goto out;
 737         }
 738
 739         err = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
 740                         old_dentry->d_name.len, &old_de_ino);
 741         if (err) {
 742                 err = -ENOENT;
 743                 goto out;
 744         }
 745
 746         /*
 747          * Check whether another node removed the source inode while we
 748          * were in the vfs.
 749          */
 750         if (old_de_ino != OCFS2_I(inode)->ip_blkno) {
 751                 err = -ENOENT;
 752                 goto out;
 753         }
 754
 755         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 756                                         dentry->d_name.len);
 757         if (err)
 758                 goto out;
 759
 760         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 761                                            dentry->d_name.name,
 762                                            dentry->d_name.len, &lookup);
 763         if (err < 0) {
 764                 mlog_errno(err);
 765                 goto out;
 766         }
 767
 768         err = ocfs2_inode_lock(inode, &fe_bh, 1);
 769         if (err < 0) {
 770                 if (err != -ENOENT)
 771                         mlog_errno(err);
 772                 goto out;
 773         }
 774
 775         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 776         if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
 777                 err = -EMLINK;
 778                 goto out_unlock_inode;
 779         }
 780
 781         handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
 782         if (IS_ERR(handle)) {
 783                 err = PTR_ERR(handle);
 784                 handle = NULL;
 785                 mlog_errno(err);
 786                 goto out_unlock_inode;
 787         }
 788
 789         /* Starting to change things, restart is no longer possible. */
 790         ocfs2_block_signals(&oldset);
 791
 792         err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 793                                       OCFS2_JOURNAL_ACCESS_WRITE);
 794         if (err < 0) {
 795                 mlog_errno(err);
 796                 goto out_commit;
 797         }
 798
 799         inc_nlink(inode);
 800         inode->i_ctime = CURRENT_TIME;
 801         ocfs2_set_links_count(fe, inode->i_nlink);
 802         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 803         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 804         ocfs2_journal_dirty(handle, fe_bh);
 805
 806         err = ocfs2_add_entry(handle, dentry, inode,
 807                               OCFS2_I(inode)->ip_blkno,
 808                               parent_fe_bh, &lookup);
 809         if (err) {
 810                 ocfs2_add_links_count(fe, -1);
 811                 drop_nlink(inode);
 812                 mlog_errno(err);
 813                 goto out_commit;
 814         }
 815
 816         err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
 817         if (err) {
 818                 mlog_errno(err);
 819                 goto out_commit;
 820         }
 821
 822         ihold(inode);
 823         d_instantiate(dentry, inode);
 824
 825 out_commit:
 826         ocfs2_commit_trans(osb, handle);
 827         ocfs2_unblock_signals(&oldset);
 828 out_unlock_inode:
 829         ocfs2_inode_unlock(inode, 1);
 830
 831 out:
 832         ocfs2_double_unlock(old_dir, dir);
 833
 834         brelse(fe_bh);
 835         brelse(parent_fe_bh);
 836         brelse(old_dir_bh);
 837
 838         ocfs2_free_dir_lookup_result(&lookup);
 839
 840         if (err)
 841                 mlog_errno(err);
 842
 843         return err;
 844 }
 845
 846 /*
 847  * Takes and drops an exclusive lock on the given dentry. This will
 848  * force other nodes to drop it.
 849  */
 850 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
 851 {
 852         int ret;
 853
 854         ret = ocfs2_dentry_lock(dentry, 1);
 855         if (ret)
 856                 mlog_errno(ret);
 857         else
 858                 ocfs2_dentry_unlock(dentry, 1);
 859
 860         return ret;
 861 }
 862
 863 static inline int ocfs2_inode_is_unlinkable(struct inode *inode)
 864 {
 865         if (S_ISDIR(inode->i_mode)) {
 866                 if (inode->i_nlink == 2)
 867                         return 1;
 868                 return 0;
 869         }
 870
 871         if (inode->i_nlink == 1)
 872                 return 1;
 873         return 0;
 874 }
 875
 876 static int ocfs2_unlink(struct inode *dir,
 877                         struct dentry *dentry)
 878 {
 879         int status;
 880         int child_locked = 0;
 881         bool is_unlinkable = false;
 882         struct inode *inode = d_inode(dentry);
 883         struct inode *orphan_dir = NULL;
 884         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 885         u64 blkno;
 886         struct ocfs2_dinode *fe = NULL;
 887         struct buffer_head *fe_bh = NULL;
 888         struct buffer_head *parent_node_bh = NULL;
 889         handle_t *handle = NULL;
 890         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 891         struct ocfs2_dir_lookup_result lookup = { NULL, };
 892         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
 893
 894         trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
 895                            dentry->d_name.name,
 896                            (unsigned long long)OCFS2_I(dir)->ip_blkno,
 897                            (unsigned long long)OCFS2_I(inode)->ip_blkno);
 898
 899         dquot_initialize(dir);
 900
 901         BUG_ON(d_inode(dentry->d_parent) != dir);
 902
 903         if (inode == osb->root_inode)
 904                 return -EPERM;
 905
 906         status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
 907                                          OI_LS_PARENT);
 908         if (status < 0) {
 909                 if (status != -ENOENT)
 910                         mlog_errno(status);
 911                 return status;
 912         }
 913
 914         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 915                                           dentry->d_name.len, &blkno, dir,
 916                                           &lookup);
 917         if (status < 0) {
 918                 if (status != -ENOENT)
 919                         mlog_errno(status);
 920                 goto leave;
 921         }
 922
 923         if (OCFS2_I(inode)->ip_blkno != blkno) {
 924                 status = -ENOENT;
 925
 926                 trace_ocfs2_unlink_noent(
 927                                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
 928                                 (unsigned long long)blkno,
 929                                 OCFS2_I(inode)->ip_flags);
 930                 goto leave;
 931         }
 932
 933         status = ocfs2_inode_lock(inode, &fe_bh, 1);
 934         if (status < 0) {
 935                 if (status != -ENOENT)
 936                         mlog_errno(status);
 937                 goto leave;
 938         }
 939         child_locked = 1;
 940
 941         if (S_ISDIR(inode->i_mode)) {
 942                 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
 943                         status = -ENOTEMPTY;
 944                         goto leave;
 945                 }
 946         }
 947
 948         status = ocfs2_remote_dentry_delete(dentry);
 949         if (status < 0) {
 950                 /* This remote delete should succeed under all normal
 951                  * circumstances. */
 952                 mlog_errno(status);
 953                 goto leave;
 954         }
 955
 956         if (ocfs2_inode_is_unlinkable(inode)) {
 957                 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
 958                                                   OCFS2_I(inode)->ip_blkno,
 959                                                   orphan_name, &orphan_insert,
 960                                                   false);
 961                 if (status < 0) {
 962                         mlog_errno(status);
 963                         goto leave;
 964                 }
 965                 is_unlinkable = true;
 966         }
 967
 968         handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
 969         if (IS_ERR(handle)) {
 970                 status = PTR_ERR(handle);
 971                 handle = NULL;
 972                 mlog_errno(status);
 973                 goto leave;
 974         }
 975
 976         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 977                                          OCFS2_JOURNAL_ACCESS_WRITE);
 978         if (status < 0) {
 979                 mlog_errno(status);
 980                 goto leave;
 981         }
 982
 983         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 984
 985         /* delete the name from the parent dir */
 986         status = ocfs2_delete_entry(handle, dir, &lookup);
 987         if (status < 0) {
 988                 mlog_errno(status);
 989                 goto leave;
 990         }
 991
 992         if (S_ISDIR(inode->i_mode))
 993                 drop_nlink(inode);
 994         drop_nlink(inode);
 995         ocfs2_set_links_count(fe, inode->i_nlink);
 996         ocfs2_journal_dirty(handle, fe_bh);
 997
 998         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 999         if (S_ISDIR(inode->i_mode))
1000                 drop_nlink(dir);
1001
1002         status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
1003         if (status < 0) {
1004                 mlog_errno(status);
1005                 if (S_ISDIR(inode->i_mode))
1006                         inc_nlink(dir);
1007                 goto leave;
1008         }
1009
1010         if (is_unlinkable) {
1011                 status = ocfs2_orphan_add(osb, handle, inode, fe_bh,
1012                                 orphan_name, &orphan_insert, orphan_dir, false);
1013                 if (status < 0)
1014                         mlog_errno(status);
1015         }
1016
1017 leave:
1018         if (handle)
1019                 ocfs2_commit_trans(osb, handle);
1020
1021         if (child_locked)
1022                 ocfs2_inode_unlock(inode, 1);
1023
1024         ocfs2_inode_unlock(dir, 1);
1025
1026         if (orphan_dir) {
1027                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1028                 ocfs2_inode_unlock(orphan_dir, 1);
1029                 mutex_unlock(&orphan_dir->i_mutex);
1030                 iput(orphan_dir);
1031         }
1032
1033         brelse(fe_bh);
1034         brelse(parent_node_bh);
1035
1036         ocfs2_free_dir_lookup_result(&orphan_insert);
1037         ocfs2_free_dir_lookup_result(&lookup);
1038
1039         if (status && (status != -ENOTEMPTY) && (status != -ENOENT))
1040                 mlog_errno(status);
1041
1042         return status;
1043 }
1044
1045 static int ocfs2_check_if_ancestor(struct ocfs2_super *osb,
1046                 u64 src_inode_no, u64 dest_inode_no)
1047 {
1048         int ret = 0, i = 0;
1049         u64 parent_inode_no = 0;
1050         u64 child_inode_no = src_inode_no;
1051         struct inode *child_inode;
1052
1053 #define MAX_LOOKUP_TIMES 32
1054         while (1) {
1055                 child_inode = ocfs2_iget(osb, child_inode_no, 0, 0);
1056                 if (IS_ERR(child_inode)) {
1057                         ret = PTR_ERR(child_inode);
1058                         break;
1059                 }
1060
1061                 ret = ocfs2_inode_lock(child_inode, NULL, 0);
1062                 if (ret < 0) {
1063                         iput(child_inode);
1064                         if (ret != -ENOENT)
1065                                 mlog_errno(ret);
1066                         break;
1067                 }
1068
1069                 ret = ocfs2_lookup_ino_from_name(child_inode, "..", 2,
1070                                 &parent_inode_no);
1071                 ocfs2_inode_unlock(child_inode, 0);
1072                 iput(child_inode);
1073                 if (ret < 0) {
1074                         ret = -ENOENT;
1075                         break;
1076                 }
1077
1078                 if (parent_inode_no == dest_inode_no) {
1079                         ret = 1;
1080                         break;
1081                 }
1082
1083                 if (parent_inode_no == osb->root_inode->i_ino) {
1084                         ret = 0;
1085                         break;
1086                 }
1087
1088                 child_inode_no = parent_inode_no;
1089
1090                 if (++i >= MAX_LOOKUP_TIMES) {
1091                         mlog(ML_NOTICE, "max lookup times reached, filesystem "
1092                                         "may have nested directories, "
1093                                         "src inode: %llu, dest inode: %llu.\n",
1094                                         (unsigned long long)src_inode_no,
1095                                         (unsigned long long)dest_inode_no);
1096                         ret = 0;
1097                         break;
1098                 }
1099         }
1100
1101         return ret;
1102 }
1103
1104 /*
1105  * The only place this should be used is rename and link!
1106  * if they have the same id, then the 1st one is the only one locked.
1107  */
1108 static int ocfs2_double_lock(struct ocfs2_super *osb,
1109                              struct buffer_head **bh1,
1110                              struct inode *inode1,
1111                              struct buffer_head **bh2,
1112                              struct inode *inode2,
1113                              int rename)
1114 {
1115         int status;
1116         int inode1_is_ancestor, inode2_is_ancestor;
1117         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
1118         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
1119
1120         trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
1121                                 (unsigned long long)oi2->ip_blkno);
1122
1123         if (*bh1)
1124                 *bh1 = NULL;
1125         if (*bh2)
1126                 *bh2 = NULL;
1127
1128         /* we always want to lock the one with the lower lockid first.
1129          * and if they are nested, we lock ancestor first */
1130         if (oi1->ip_blkno != oi2->ip_blkno) {
1131                 inode1_is_ancestor = ocfs2_check_if_ancestor(osb, oi2->ip_blkno,
1132                                 oi1->ip_blkno);
1133                 if (inode1_is_ancestor < 0) {
1134                         status = inode1_is_ancestor;
1135                         goto bail;
1136                 }
1137
1138                 inode2_is_ancestor = ocfs2_check_if_ancestor(osb, oi1->ip_blkno,
1139                                 oi2->ip_blkno);
1140                 if (inode2_is_ancestor < 0) {
1141                         status = inode2_is_ancestor;
1142                         goto bail;
1143                 }
1144
1145                 if ((inode1_is_ancestor == 1) ||
1146                                 (oi1->ip_blkno < oi2->ip_blkno &&
1147                                 inode2_is_ancestor == 0)) {
1148                         /* switch id1 and id2 around */
1149                         swap(bh2, bh1);
1150                         swap(inode2, inode1);
1151                 }
1152                 /* lock id2 */
1153                 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
1154                                 rename == 1 ? OI_LS_RENAME1 : OI_LS_PARENT);
1155                 if (status < 0) {
1156                         if (status != -ENOENT)
1157                                 mlog_errno(status);
1158                         goto bail;
1159                 }
1160         }
1161
1162         /* lock id1 */
1163         status = ocfs2_inode_lock_nested(inode1, bh1, 1,
1164                         rename == 1 ?  OI_LS_RENAME2 : OI_LS_PARENT);
1165         if (status < 0) {
1166                 /*
1167                  * An error return must mean that no cluster locks
1168                  * were held on function exit.
1169                  */
1170                 if (oi1->ip_blkno != oi2->ip_blkno) {
1171                         ocfs2_inode_unlock(inode2, 1);
1172                         brelse(*bh2);
1173                         *bh2 = NULL;
1174                 }
1175
1176                 if (status != -ENOENT)
1177                         mlog_errno(status);
1178         }
1179
1180         trace_ocfs2_double_lock_end(
1181                         (unsigned long long)OCFS2_I(inode1)->ip_blkno,
1182                         (unsigned long long)OCFS2_I(inode2)->ip_blkno);
1183
1184 bail:
1185         if (status)
1186                 mlog_errno(status);
1187         return status;
1188 }
1189
1190 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1191 {
1192         ocfs2_inode_unlock(inode1, 1);
1193
1194         if (inode1 != inode2)
1195                 ocfs2_inode_unlock(inode2, 1);
1196 }
1197
1198 static int ocfs2_rename(struct inode *old_dir,
1199                         struct dentry *old_dentry,
1200                         struct inode *new_dir,
1201                         struct dentry *new_dentry)
1202 {
1203         int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1204         int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1205         struct inode *old_inode = d_inode(old_dentry);
1206         struct inode *new_inode = d_inode(new_dentry);
1207         struct inode *orphan_dir = NULL;
1208         struct ocfs2_dinode *newfe = NULL;
1209         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1210         struct buffer_head *newfe_bh = NULL;
1211         struct buffer_head *old_inode_bh = NULL;
1212         struct ocfs2_super *osb = NULL;
1213         u64 newfe_blkno, old_de_ino;
1214         handle_t *handle = NULL;
1215         struct buffer_head *old_dir_bh = NULL;
1216         struct buffer_head *new_dir_bh = NULL;
1217         u32 old_dir_nlink = old_dir->i_nlink;
1218         struct ocfs2_dinode *old_di;
1219         struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1220         struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1221         struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1222         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1223         struct ocfs2_dir_lookup_result target_insert = { NULL, };
1224         bool should_add_orphan = false;
1225
1226         /* At some point it might be nice to break this function up a
1227          * bit. */
1228
1229         trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry,
1230                            old_dentry->d_name.len, old_dentry->d_name.name,
1231                            new_dentry->d_name.len, new_dentry->d_name.name);
1232
1233         dquot_initialize(old_dir);
1234         dquot_initialize(new_dir);
1235
1236         osb = OCFS2_SB(old_dir->i_sb);
1237
1238         if (new_inode) {
1239                 if (!igrab(new_inode))
1240                         BUG();
1241         }
1242
1243         /* Assume a directory hierarchy thusly:
1244          * a/b/c
1245          * a/d
1246          * a,b,c, and d are all directories.
1247          *
1248          * from cwd of 'a' on both nodes:
1249          * node1: mv b/c d
1250          * node2: mv d   b/c
1251          *
1252          * And that's why, just like the VFS, we need a file system
1253          * rename lock. */
1254         if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1255                 status = ocfs2_rename_lock(osb);
1256                 if (status < 0) {
1257                         mlog_errno(status);
1258                         goto bail;
1259                 }
1260                 rename_lock = 1;
1261
1262                 /* here we cannot guarantee the inodes haven't just been
1263                  * changed, so check if they are nested again */
1264                 status = ocfs2_check_if_ancestor(osb, new_dir->i_ino,
1265                                 old_inode->i_ino);
1266                 if (status < 0) {
1267                         mlog_errno(status);
1268                         goto bail;
1269                 } else if (status == 1) {
1270                         status = -EPERM;
1271                         trace_ocfs2_rename_not_permitted(
1272                                         (unsigned long long)old_inode->i_ino,
1273                                         (unsigned long long)new_dir->i_ino);
1274                         goto bail;
1275                 }
1276         }
1277
1278         /* if old and new are the same, this'll just do one lock. */
1279         status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1280                                    &new_dir_bh, new_dir, 1);
1281         if (status < 0) {
1282                 mlog_errno(status);
1283                 goto bail;
1284         }
1285         parents_locked = 1;
1286
1287         /* make sure both dirs have bhs
1288          * get an extra ref on old_dir_bh if old==new */
1289         if (!new_dir_bh) {
1290                 if (old_dir_bh) {
1291                         new_dir_bh = old_dir_bh;
1292                         get_bh(new_dir_bh);
1293                 } else {
1294                         mlog(ML_ERROR, "no old_dir_bh!\n");
1295                         status = -EIO;
1296                         goto bail;
1297                 }
1298         }
1299
1300         /*
1301          * Aside from allowing a meta data update, the locking here
1302          * also ensures that the downconvert thread on other nodes
1303          * won't have to concurrently downconvert the inode and the
1304          * dentry locks.
1305          */
1306         status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1307                                          OI_LS_PARENT);
1308         if (status < 0) {
1309                 if (status != -ENOENT)
1310                         mlog_errno(status);
1311                 goto bail;
1312         }
1313         old_child_locked = 1;
1314
1315         status = ocfs2_remote_dentry_delete(old_dentry);
1316         if (status < 0) {
1317                 mlog_errno(status);
1318                 goto bail;
1319         }
1320
1321         if (S_ISDIR(old_inode->i_mode)) {
1322                 u64 old_inode_parent;
1323
1324                 update_dot_dot = 1;
1325                 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1326                                                   old_inode,
1327                                                   &old_inode_dot_dot_res);
1328                 if (status) {
1329                         status = -EIO;
1330                         goto bail;
1331                 }
1332
1333                 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1334                         status = -EIO;
1335                         goto bail;
1336                 }
1337
1338                 if (!new_inode && new_dir != old_dir &&
1339                     new_dir->i_nlink >= ocfs2_link_max(osb)) {
1340                         status = -EMLINK;
1341                         goto bail;
1342                 }
1343         }
1344
1345         status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1346                                             old_dentry->d_name.len,
1347                                             &old_de_ino);
1348         if (status) {
1349                 status = -ENOENT;
1350                 goto bail;
1351         }
1352
1353         /*
1354          *  Check for inode number is _not_ due to possible IO errors.
1355          *  We might rmdir the source, keep it as pwd of some process
1356          *  and merrily kill the link to whatever was created under the
1357          *  same name. Goodbye sticky bit ;-<
1358          */
1359         if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1360                 status = -ENOENT;
1361                 goto bail;
1362         }
1363
1364         /* check if the target already exists (in which case we need
1365          * to delete it */
1366         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1367                                           new_dentry->d_name.len,
1368                                           &newfe_blkno, new_dir,
1369                                           &target_lookup_res);
1370         /* The only error we allow here is -ENOENT because the new
1371          * file not existing is perfectly valid. */
1372         if ((status < 0) && (status != -ENOENT)) {
1373                 /* If we cannot find the file specified we should just */
1374                 /* return the error... */
1375                 mlog_errno(status);
1376                 goto bail;
1377         }
1378         if (status == 0)
1379                 target_exists = 1;
1380
1381         if (!target_exists && new_inode) {
1382                 /*
1383                  * Target was unlinked by another node while we were
1384                  * waiting to get to ocfs2_rename(). There isn't
1385                  * anything we can do here to help the situation, so
1386                  * bubble up the appropriate error.
1387                  */
1388                 status = -ENOENT;
1389                 goto bail;
1390         }
1391
1392         /* In case we need to overwrite an existing file, we blow it
1393          * away first */
1394         if (target_exists) {
1395                 /* VFS didn't think there existed an inode here, but
1396                  * someone else in the cluster must have raced our
1397                  * rename to create one. Today we error cleanly, in
1398                  * the future we should consider calling iget to build
1399                  * a new struct inode for this entry. */
1400                 if (!new_inode) {
1401                         status = -EACCES;
1402
1403                         trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
1404                                                 new_dentry->d_name.name);
1405                         goto bail;
1406                 }
1407
1408                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1409                         status = -EACCES;
1410
1411                         trace_ocfs2_rename_disagree(
1412                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1413                              (unsigned long long)newfe_blkno,
1414                              OCFS2_I(new_inode)->ip_flags);
1415                         goto bail;
1416                 }
1417
1418                 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1419                 if (status < 0) {
1420                         if (status != -ENOENT)
1421                                 mlog_errno(status);
1422                         goto bail;
1423                 }
1424                 new_child_locked = 1;
1425
1426                 status = ocfs2_remote_dentry_delete(new_dentry);
1427                 if (status < 0) {
1428                         mlog_errno(status);
1429                         goto bail;
1430                 }
1431
1432                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1433
1434                 trace_ocfs2_rename_over_existing(
1435                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1436                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1437
1438                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1439                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1440                                                 OCFS2_I(new_inode)->ip_blkno,
1441                                                 orphan_name, &orphan_insert,
1442                                                 false);
1443                         if (status < 0) {
1444                                 mlog_errno(status);
1445                                 goto bail;
1446                         }
1447                         should_add_orphan = true;
1448                 }
1449         } else {
1450                 BUG_ON(d_inode(new_dentry->d_parent) != new_dir);
1451
1452                 status = ocfs2_check_dir_for_entry(new_dir,
1453                                                    new_dentry->d_name.name,
1454                                                    new_dentry->d_name.len);
1455                 if (status)
1456                         goto bail;
1457
1458                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1459                                                       new_dentry->d_name.name,
1460                                                       new_dentry->d_name.len,
1461                                                       &target_insert);
1462                 if (status < 0) {
1463                         mlog_errno(status);
1464                         goto bail;
1465                 }
1466         }
1467
1468         handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1469         if (IS_ERR(handle)) {
1470                 status = PTR_ERR(handle);
1471                 handle = NULL;
1472                 mlog_errno(status);
1473                 goto bail;
1474         }
1475
1476         if (target_exists) {
1477                 if (S_ISDIR(new_inode->i_mode)) {
1478                         if (new_inode->i_nlink != 2 ||
1479                             !ocfs2_empty_dir(new_inode)) {
1480                                 status = -ENOTEMPTY;
1481                                 goto bail;
1482                         }
1483                 }
1484                 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1485                                                  newfe_bh,
1486                                                  OCFS2_JOURNAL_ACCESS_WRITE);
1487                 if (status < 0) {
1488                         mlog_errno(status);
1489                         goto bail;
1490                 }
1491
1492                 /* change the dirent to point to the correct inode */
1493                 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1494                                             old_inode);
1495                 if (status < 0) {
1496                         mlog_errno(status);
1497                         goto bail;
1498                 }
1499                 new_dir->i_version++;
1500
1501                 if (S_ISDIR(new_inode->i_mode))
1502                         ocfs2_set_links_count(newfe, 0);
1503                 else
1504                         ocfs2_add_links_count(newfe, -1);
1505                 ocfs2_journal_dirty(handle, newfe_bh);
1506                 if (should_add_orphan) {
1507                         status = ocfs2_orphan_add(osb, handle, new_inode,
1508                                         newfe_bh, orphan_name,
1509                                         &orphan_insert, orphan_dir, false);
1510                         if (status < 0) {
1511                                 mlog_errno(status);
1512                                 goto bail;
1513                         }
1514                 }
1515         } else {
1516                 /* if the name was not found in new_dir, add it now */
1517                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1518                                          OCFS2_I(old_inode)->ip_blkno,
1519                                          new_dir_bh, &target_insert);
1520         }
1521
1522         old_inode->i_ctime = CURRENT_TIME;
1523         mark_inode_dirty(old_inode);
1524
1525         status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1526                                          old_inode_bh,
1527                                          OCFS2_JOURNAL_ACCESS_WRITE);
1528         if (status >= 0) {
1529                 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1530
1531                 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1532                 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1533                 ocfs2_journal_dirty(handle, old_inode_bh);
1534         } else
1535                 mlog_errno(status);
1536
1537         /*
1538          * Now that the name has been added to new_dir, remove the old name.
1539          *
1540          * We don't keep any directory entry context around until now
1541          * because the insert might have changed the type of directory
1542          * we're dealing with.
1543          */
1544         status = ocfs2_find_entry(old_dentry->d_name.name,
1545                                   old_dentry->d_name.len, old_dir,
1546                                   &old_entry_lookup);
1547         if (status)
1548                 goto bail;
1549
1550         status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1551         if (status < 0) {
1552                 mlog_errno(status);
1553                 goto bail;
1554         }
1555
1556         if (new_inode) {
1557                 drop_nlink(new_inode);
1558                 new_inode->i_ctime = CURRENT_TIME;
1559         }
1560         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1561
1562         if (update_dot_dot) {
1563                 status = ocfs2_update_entry(old_inode, handle,
1564                                             &old_inode_dot_dot_res, new_dir);
1565                 drop_nlink(old_dir);
1566                 if (new_inode) {
1567                         drop_nlink(new_inode);
1568                 } else {
1569                         inc_nlink(new_dir);
1570                         mark_inode_dirty(new_dir);
1571                 }
1572         }
1573         mark_inode_dirty(old_dir);
1574         ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1575         if (new_inode) {
1576                 mark_inode_dirty(new_inode);
1577                 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1578         }
1579
1580         if (old_dir != new_dir) {
1581                 /* Keep the same times on both directories.*/
1582                 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1583
1584                 /*
1585                  * This will also pick up the i_nlink change from the
1586                  * block above.
1587                  */
1588                 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1589         }
1590
1591         if (old_dir_nlink != old_dir->i_nlink) {
1592                 if (!old_dir_bh) {
1593                         mlog(ML_ERROR, "need to change nlink for old dir "
1594                              "%llu from %d to %d but bh is NULL!\n",
1595                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1596                              (int)old_dir_nlink, old_dir->i_nlink);
1597                 } else {
1598                         struct ocfs2_dinode *fe;
1599                         status = ocfs2_journal_access_di(handle,
1600                                                          INODE_CACHE(old_dir),
1601                                                          old_dir_bh,
1602                                                          OCFS2_JOURNAL_ACCESS_WRITE);
1603                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1604                         ocfs2_set_links_count(fe, old_dir->i_nlink);
1605                         ocfs2_journal_dirty(handle, old_dir_bh);
1606                 }
1607         }
1608         ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1609         status = 0;
1610 bail:
1611         if (rename_lock)
1612                 ocfs2_rename_unlock(osb);
1613
1614         if (handle)
1615                 ocfs2_commit_trans(osb, handle);
1616
1617         if (parents_locked)
1618                 ocfs2_double_unlock(old_dir, new_dir);
1619
1620         if (old_child_locked)
1621                 ocfs2_inode_unlock(old_inode, 1);
1622
1623         if (new_child_locked)
1624                 ocfs2_inode_unlock(new_inode, 1);
1625
1626         if (orphan_dir) {
1627                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1628                 ocfs2_inode_unlock(orphan_dir, 1);
1629                 mutex_unlock(&orphan_dir->i_mutex);
1630                 iput(orphan_dir);
1631         }
1632
1633         if (new_inode)
1634                 sync_mapping_buffers(old_inode->i_mapping);
1635
1636         if (new_inode)
1637                 iput(new_inode);
1638
1639         ocfs2_free_dir_lookup_result(&target_lookup_res);
1640         ocfs2_free_dir_lookup_result(&old_entry_lookup);
1641         ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1642         ocfs2_free_dir_lookup_result(&orphan_insert);
1643         ocfs2_free_dir_lookup_result(&target_insert);
1644
1645         brelse(newfe_bh);
1646         brelse(old_inode_bh);
1647         brelse(old_dir_bh);
1648         brelse(new_dir_bh);
1649
1650         if (status)
1651                 mlog_errno(status);
1652
1653         return status;
1654 }
1655
1656 /*
1657  * we expect i_size = strlen(symname). Copy symname into the file
1658  * data, including the null terminator.
1659  */
1660 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1661                                      handle_t *handle,
1662                                      struct inode *inode,
1663                                      const char *symname)
1664 {
1665         struct buffer_head **bhs = NULL;
1666         const char *c;
1667         struct super_block *sb = osb->sb;
1668         u64 p_blkno, p_blocks;
1669         int virtual, blocks, status, i, bytes_left;
1670
1671         bytes_left = i_size_read(inode) + 1;
1672         /* we can't trust i_blocks because we're actually going to
1673          * write i_size + 1 bytes. */
1674         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1675
1676         trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks,
1677                                         i_size_read(inode), blocks);
1678
1679         /* Sanity check -- make sure we're going to fit. */
1680         if (bytes_left >
1681             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1682                 status = -EIO;
1683                 mlog_errno(status);
1684                 goto bail;
1685         }
1686
1687         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1688         if (!bhs) {
1689                 status = -ENOMEM;
1690                 mlog_errno(status);
1691                 goto bail;
1692         }
1693
1694         status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1695                                              NULL);
1696         if (status < 0) {
1697                 mlog_errno(status);
1698                 goto bail;
1699         }
1700
1701         /* links can never be larger than one cluster so we know this
1702          * is all going to be contiguous, but do a sanity check
1703          * anyway. */
1704         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1705                 status = -EIO;
1706                 mlog_errno(status);
1707                 goto bail;
1708         }
1709
1710         virtual = 0;
1711         while(bytes_left > 0) {
1712                 c = &symname[virtual * sb->s_blocksize];
1713
1714                 bhs[virtual] = sb_getblk(sb, p_blkno);
1715                 if (!bhs[virtual]) {
1716                         status = -ENOMEM;
1717                         mlog_errno(status);
1718                         goto bail;
1719                 }
1720                 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1721                                               bhs[virtual]);
1722
1723                 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1724                                               bhs[virtual],
1725                                               OCFS2_JOURNAL_ACCESS_CREATE);
1726                 if (status < 0) {
1727                         mlog_errno(status);
1728                         goto bail;
1729                 }
1730
1731                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1732
1733                 memcpy(bhs[virtual]->b_data, c,
1734                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1735                        bytes_left);
1736
1737                 ocfs2_journal_dirty(handle, bhs[virtual]);
1738
1739                 virtual++;
1740                 p_blkno++;
1741                 bytes_left -= sb->s_blocksize;
1742         }
1743
1744         status = 0;
1745 bail:
1746
1747         if (bhs) {
1748                 for(i = 0; i < blocks; i++)
1749                         brelse(bhs[i]);
1750                 kfree(bhs);
1751         }
1752
1753         if (status)
1754                 mlog_errno(status);
1755         return status;
1756 }
1757
1758 static int ocfs2_symlink(struct inode *dir,
1759                          struct dentry *dentry,
1760                          const char *symname)
1761 {
1762         int status, l, credits;
1763         u64 newsize;
1764         struct ocfs2_super *osb = NULL;
1765         struct inode *inode = NULL;
1766         struct super_block *sb;
1767         struct buffer_head *new_fe_bh = NULL;
1768         struct buffer_head *parent_fe_bh = NULL;
1769         struct ocfs2_dinode *fe = NULL;
1770         struct ocfs2_dinode *dirfe;
1771         handle_t *handle = NULL;
1772         struct ocfs2_alloc_context *inode_ac = NULL;
1773         struct ocfs2_alloc_context *data_ac = NULL;
1774         struct ocfs2_alloc_context *xattr_ac = NULL;
1775         int want_clusters = 0;
1776         int xattr_credits = 0;
1777         struct ocfs2_security_xattr_info si = {
1778                 .enable = 1,
1779         };
1780         int did_quota = 0, did_quota_inode = 0;
1781         struct ocfs2_dir_lookup_result lookup = { NULL, };
1782         sigset_t oldset;
1783         int did_block_signals = 0;
1784         struct ocfs2_dentry_lock *dl = NULL;
1785
1786         trace_ocfs2_symlink_begin(dir, dentry, symname,
1787                                   dentry->d_name.len, dentry->d_name.name);
1788
1789         dquot_initialize(dir);
1790
1791         sb = dir->i_sb;
1792         osb = OCFS2_SB(sb);
1793
1794         l = strlen(symname) + 1;
1795
1796         credits = ocfs2_calc_symlink_credits(sb);
1797
1798         /* lock the parent directory */
1799         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1800         if (status < 0) {
1801                 if (status != -ENOENT)
1802                         mlog_errno(status);
1803                 return status;
1804         }
1805
1806         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1807         if (!ocfs2_read_links_count(dirfe)) {
1808                 /* can't make a file in a deleted directory. */
1809                 status = -ENOENT;
1810                 goto bail;
1811         }
1812
1813         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1814                                            dentry->d_name.len);
1815         if (status)
1816                 goto bail;
1817
1818         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1819                                               dentry->d_name.name,
1820                                               dentry->d_name.len, &lookup);
1821         if (status < 0) {
1822                 mlog_errno(status);
1823                 goto bail;
1824         }
1825
1826         status = ocfs2_reserve_new_inode(osb, &inode_ac);
1827         if (status < 0) {
1828                 if (status != -ENOSPC)
1829                         mlog_errno(status);
1830                 goto bail;
1831         }
1832
1833         inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1834         if (!inode) {
1835                 status = -ENOMEM;
1836                 mlog_errno(status);
1837                 goto bail;
1838         }
1839
1840         /* get security xattr */
1841         status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1842         if (status) {
1843                 if (status == -EOPNOTSUPP)
1844                         si.enable = 0;
1845                 else {
1846                         mlog_errno(status);
1847                         goto bail;
1848                 }
1849         }
1850
1851         /* calculate meta data/clusters for setting security xattr */
1852         if (si.enable) {
1853                 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1854                                                   &xattr_credits, &xattr_ac);
1855                 if (status < 0) {
1856                         mlog_errno(status);
1857                         goto bail;
1858                 }
1859         }
1860
1861         /* don't reserve bitmap space for fast symlinks. */
1862         if (l > ocfs2_fast_symlink_chars(sb))
1863                 want_clusters += 1;
1864
1865         status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1866         if (status < 0) {
1867                 if (status != -ENOSPC)
1868                         mlog_errno(status);
1869                 goto bail;
1870         }
1871
1872         handle = ocfs2_start_trans(osb, credits + xattr_credits);
1873         if (IS_ERR(handle)) {
1874                 status = PTR_ERR(handle);
1875                 handle = NULL;
1876                 mlog_errno(status);
1877                 goto bail;
1878         }
1879
1880         /* Starting to change things, restart is no longer possible. */
1881         ocfs2_block_signals(&oldset);
1882         did_block_signals = 1;
1883
1884         status = dquot_alloc_inode(inode);
1885         if (status)
1886                 goto bail;
1887         did_quota_inode = 1;
1888
1889         trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
1890                                    dentry->d_name.name,
1891                                    (unsigned long long)OCFS2_I(dir)->ip_blkno,
1892                                    inode->i_mode);
1893
1894         status = ocfs2_mknod_locked(osb, dir, inode,
1895                                     0, &new_fe_bh, parent_fe_bh, handle,
1896                                     inode_ac);
1897         if (status < 0) {
1898                 mlog_errno(status);
1899                 goto bail;
1900         }
1901
1902         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1903         inode->i_rdev = 0;
1904         newsize = l - 1;
1905         inode->i_op = &ocfs2_symlink_inode_operations;
1906         if (l > ocfs2_fast_symlink_chars(sb)) {
1907                 u32 offset = 0;
1908
1909                 status = dquot_alloc_space_nodirty(inode,
1910                     ocfs2_clusters_to_bytes(osb->sb, 1));
1911                 if (status)
1912                         goto bail;
1913                 did_quota = 1;
1914                 inode->i_mapping->a_ops = &ocfs2_aops;
1915                 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1916                                               new_fe_bh,
1917                                               handle, data_ac, NULL,
1918                                               NULL);
1919                 if (status < 0) {
1920                         if (status != -ENOSPC && status != -EINTR) {
1921                                 mlog(ML_ERROR,
1922                                      "Failed to extend file to %llu\n",
1923                                      (unsigned long long)newsize);
1924                                 mlog_errno(status);
1925                                 status = -ENOSPC;
1926                         }
1927                         goto bail;
1928                 }
1929                 i_size_write(inode, newsize);
1930                 inode->i_blocks = ocfs2_inode_sector_count(inode);
1931         } else {
1932                 inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
1933                 memcpy((char *) fe->id2.i_symlink, symname, l);
1934                 i_size_write(inode, newsize);
1935                 inode->i_blocks = 0;
1936         }
1937
1938         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1939         if (status < 0) {
1940                 mlog_errno(status);
1941                 goto bail;
1942         }
1943
1944         if (!ocfs2_inode_is_fast_symlink(inode)) {
1945                 status = ocfs2_create_symlink_data(osb, handle, inode,
1946                                                    symname);
1947                 if (status < 0) {
1948                         mlog_errno(status);
1949                         goto bail;
1950                 }
1951         }
1952
1953         if (si.enable) {
1954                 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1955                                                  xattr_ac, data_ac);
1956                 if (status < 0) {
1957                         mlog_errno(status);
1958                         goto bail;
1959                 }
1960         }
1961
1962         /*
1963          * Do this before adding the entry to the directory. We add
1964          * also set d_op after success so that ->d_iput() will cleanup
1965          * the dentry lock even if ocfs2_add_entry() fails below.
1966          */
1967         status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1968         if (status) {
1969                 mlog_errno(status);
1970                 goto bail;
1971         }
1972
1973         dl = dentry->d_fsdata;
1974
1975         status = ocfs2_add_entry(handle, dentry, inode,
1976                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1977                                  &lookup);
1978         if (status < 0) {
1979                 mlog_errno(status);
1980                 goto bail;
1981         }
1982
1983         insert_inode_hash(inode);
1984         d_instantiate(dentry, inode);
1985 bail:
1986         if (status < 0 && did_quota)
1987                 dquot_free_space_nodirty(inode,
1988                                         ocfs2_clusters_to_bytes(osb->sb, 1));
1989         if (status < 0 && did_quota_inode)
1990                 dquot_free_inode(inode);
1991         if (handle)
1992                 ocfs2_commit_trans(osb, handle);
1993
1994         ocfs2_inode_unlock(dir, 1);
1995         if (did_block_signals)
1996                 ocfs2_unblock_signals(&oldset);
1997
1998         brelse(new_fe_bh);
1999         brelse(parent_fe_bh);
2000         kfree(si.value);
2001         ocfs2_free_dir_lookup_result(&lookup);
2002         if (inode_ac)
2003                 ocfs2_free_alloc_context(inode_ac);
2004         if (data_ac)
2005                 ocfs2_free_alloc_context(data_ac);
2006         if (xattr_ac)
2007                 ocfs2_free_alloc_context(xattr_ac);
2008         if ((status < 0) && inode) {
2009                 if (dl)
2010                         ocfs2_cleanup_add_entry_failure(osb, dentry, inode);
2011
2012                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
2013                 clear_nlink(inode);
2014                 iput(inode);
2015         }
2016
2017         if (status)
2018                 mlog_errno(status);
2019
2020         return status;
2021 }
2022
2023 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2024 {
2025         int status, namelen;
2026
2027         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2028                            (long long)blkno);
2029         if (namelen <= 0) {
2030                 if (namelen)
2031                         status = namelen;
2032                 else
2033                         status = -EINVAL;
2034                 mlog_errno(status);
2035                 goto bail;
2036         }
2037         if (namelen != OCFS2_ORPHAN_NAMELEN) {
2038                 status = -EINVAL;
2039                 mlog_errno(status);
2040                 goto bail;
2041         }
2042
2043         trace_ocfs2_blkno_stringify(blkno, name, namelen);
2044
2045         status = 0;
2046 bail:
2047         if (status < 0)
2048                 mlog_errno(status);
2049         return status;
2050 }
2051
2052 static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
2053                                         struct inode **ret_orphan_dir,
2054                                         struct buffer_head **ret_orphan_dir_bh)
2055 {
2056         struct inode *orphan_dir_inode;
2057         struct buffer_head *orphan_dir_bh = NULL;
2058         int ret = 0;
2059
2060         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2061                                                        ORPHAN_DIR_SYSTEM_INODE,
2062                                                        osb->slot_num);
2063         if (!orphan_dir_inode) {
2064                 ret = -ENOENT;
2065                 mlog_errno(ret);
2066                 return ret;
2067         }
2068
2069         mutex_lock(&orphan_dir_inode->i_mutex);
2070
2071         ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2072         if (ret < 0) {
2073                 mutex_unlock(&orphan_dir_inode->i_mutex);
2074                 iput(orphan_dir_inode);
2075
2076                 mlog_errno(ret);
2077                 return ret;
2078         }
2079
2080         *ret_orphan_dir = orphan_dir_inode;
2081         *ret_orphan_dir_bh = orphan_dir_bh;
2082
2083         return 0;
2084 }
2085
2086 static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
2087                                       struct buffer_head *orphan_dir_bh,
2088                                       u64 blkno,
2089                                       char *name,
2090                                       struct ocfs2_dir_lookup_result *lookup,
2091                                       bool dio)
2092 {
2093         int ret;
2094         struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
2095         int namelen = dio ?
2096                         (OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN) :
2097                         OCFS2_ORPHAN_NAMELEN;
2098
2099         if (dio) {
2100                 ret = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
2101                                 OCFS2_DIO_ORPHAN_PREFIX);
2102                 if (ret != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
2103                         ret = -EINVAL;
2104                         mlog_errno(ret);
2105                         return ret;
2106                 }
2107
2108                 ret = ocfs2_blkno_stringify(blkno,
2109                                 name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
2110         } else
2111                 ret = ocfs2_blkno_stringify(blkno, name);
2112         if (ret < 0) {
2113                 mlog_errno(ret);
2114                 return ret;
2115         }
2116
2117         ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2118                                            orphan_dir_bh, name,
2119                                            namelen, lookup);
2120         if (ret < 0) {
2121                 mlog_errno(ret);
2122                 return ret;
2123         }
2124
2125         return 0;
2126 }
2127
2128 /**
2129  * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
2130  * insertion of an orphan.
2131  * @osb: ocfs2 file system
2132  * @ret_orphan_dir: Orphan dir inode - returned locked!
2133  * @blkno: Actual block number of the inode to be inserted into orphan dir.
2134  * @lookup: dir lookup result, to be passed back into functions like
2135  *          ocfs2_orphan_add
2136  *
2137  * Returns zero on success and the ret_orphan_dir, name and lookup
2138  * fields will be populated.
2139  *
2140  * Returns non-zero on failure.
2141  */
2142 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2143                                     struct inode **ret_orphan_dir,
2144                                     u64 blkno,
2145                                     char *name,
2146                                     struct ocfs2_dir_lookup_result *lookup,
2147                                     bool dio)
2148 {
2149         struct inode *orphan_dir_inode = NULL;
2150         struct buffer_head *orphan_dir_bh = NULL;
2151         int ret = 0;
2152
2153         ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
2154                                            &orphan_dir_bh);
2155         if (ret < 0) {
2156                 mlog_errno(ret);
2157                 return ret;
2158         }
2159
2160         ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
2161                                          blkno, name, lookup, dio);
2162         if (ret < 0) {
2163                 mlog_errno(ret);
2164                 goto out;
2165         }
2166
2167         *ret_orphan_dir = orphan_dir_inode;
2168
2169 out:
2170         brelse(orphan_dir_bh);
2171
2172         if (ret) {
2173                 ocfs2_inode_unlock(orphan_dir_inode, 1);
2174                 mutex_unlock(&orphan_dir_inode->i_mutex);
2175                 iput(orphan_dir_inode);
2176         }
2177
2178         if (ret)
2179                 mlog_errno(ret);
2180         return ret;
2181 }
2182
2183 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2184                             handle_t *handle,
2185                             struct inode *inode,
2186                             struct buffer_head *fe_bh,
2187                             char *name,
2188                             struct ocfs2_dir_lookup_result *lookup,
2189                             struct inode *orphan_dir_inode,
2190                             bool dio)
2191 {
2192         struct buffer_head *orphan_dir_bh = NULL;
2193         int status = 0;
2194         struct ocfs2_dinode *orphan_fe;
2195         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
2196         int namelen = dio ?
2197                         (OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN) :
2198                         OCFS2_ORPHAN_NAMELEN;
2199
2200         trace_ocfs2_orphan_add_begin(
2201                                 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2202
2203         status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
2204         if (status < 0) {
2205                 mlog_errno(status);
2206                 goto leave;
2207         }
2208
2209         status = ocfs2_journal_access_di(handle,
2210                                          INODE_CACHE(orphan_dir_inode),
2211                                          orphan_dir_bh,
2212                                          OCFS2_JOURNAL_ACCESS_WRITE);
2213         if (status < 0) {
2214                 mlog_errno(status);
2215                 goto leave;
2216         }
2217
2218         /*
2219          * We're going to journal the change of i_flags and i_orphaned_slot.
2220          * It's safe anyway, though some callers may duplicate the journaling.
2221          * Journaling within the func just make the logic look more
2222          * straightforward.
2223          */
2224         status = ocfs2_journal_access_di(handle,
2225                                          INODE_CACHE(inode),
2226                                          fe_bh,
2227                                          OCFS2_JOURNAL_ACCESS_WRITE);
2228         if (status < 0) {
2229                 mlog_errno(status);
2230                 goto leave;
2231         }
2232
2233         /* we're a cluster, and nlink can change on disk from
2234          * underneath us... */
2235         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2236         if (S_ISDIR(inode->i_mode))
2237                 ocfs2_add_links_count(orphan_fe, 1);
2238         set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2239         ocfs2_journal_dirty(handle, orphan_dir_bh);
2240
2241         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2242                                    namelen, inode,
2243                                    OCFS2_I(inode)->ip_blkno,
2244                                    orphan_dir_bh, lookup);
2245         if (status < 0) {
2246                 mlog_errno(status);
2247                 goto rollback;
2248         }
2249
2250         if (dio) {
2251                 /* Update flag OCFS2_DIO_ORPHANED_FL and record the orphan
2252                  * slot.
2253                  */
2254                 fe->i_flags |= cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
2255                 fe->i_dio_orphaned_slot = cpu_to_le16(osb->slot_num);
2256         } else {
2257                 fe->i_flags |= cpu_to_le32(OCFS2_ORPHANED_FL);
2258                 OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
2259
2260                 /* Record which orphan dir our inode now resides
2261                  * in. delete_inode will use this to determine which orphan
2262                  * dir to lock. */
2263                 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2264         }
2265
2266         ocfs2_journal_dirty(handle, fe_bh);
2267
2268         trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
2269                                    osb->slot_num);
2270
2271 rollback:
2272         if (status < 0) {
2273                 if (S_ISDIR(inode->i_mode))
2274                         ocfs2_add_links_count(orphan_fe, -1);
2275                 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2276         }
2277
2278 leave:
2279         brelse(orphan_dir_bh);
2280
2281         return status;
2282 }
2283
2284 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2285 int ocfs2_orphan_del(struct ocfs2_super *osb,
2286                      handle_t *handle,
2287                      struct inode *orphan_dir_inode,
2288                      struct inode *inode,
2289                      struct buffer_head *orphan_dir_bh,
2290                      bool dio)
2291 {
2292         const int namelen = OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN;
2293         char name[namelen + 1];
2294         struct ocfs2_dinode *orphan_fe;
2295         int status = 0;
2296         struct ocfs2_dir_lookup_result lookup = { NULL, };
2297
2298         if (dio) {
2299                 status = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
2300                                 OCFS2_DIO_ORPHAN_PREFIX);
2301                 if (status != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
2302                         status = -EINVAL;
2303                         mlog_errno(status);
2304                         return status;
2305                 }
2306
2307                 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno,
2308                                 name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
2309         } else
2310                 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2311         if (status < 0) {
2312                 mlog_errno(status);
2313                 goto leave;
2314         }
2315
2316         trace_ocfs2_orphan_del(
2317              (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2318              name, strlen(name));
2319
2320         /* find it's spot in the orphan directory */
2321         status = ocfs2_find_entry(name, strlen(name), orphan_dir_inode,
2322                                   &lookup);
2323         if (status) {
2324                 mlog_errno(status);
2325                 goto leave;
2326         }
2327
2328         /* remove it from the orphan directory */
2329         status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2330         if (status < 0) {
2331                 mlog_errno(status);
2332                 goto leave;
2333         }
2334
2335         status = ocfs2_journal_access_di(handle,
2336                                          INODE_CACHE(orphan_dir_inode),
2337                                          orphan_dir_bh,
2338                                          OCFS2_JOURNAL_ACCESS_WRITE);
2339         if (status < 0) {
2340                 mlog_errno(status);
2341                 goto leave;
2342         }
2343
2344         /* do the i_nlink dance! :) */
2345         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2346         if (S_ISDIR(inode->i_mode))
2347                 ocfs2_add_links_count(orphan_fe, -1);
2348         set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2349         ocfs2_journal_dirty(handle, orphan_dir_bh);
2350
2351 leave:
2352         ocfs2_free_dir_lookup_result(&lookup);
2353
2354         if (status)
2355                 mlog_errno(status);
2356         return status;
2357 }
2358
2359 /**
2360  * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
2361  * allocated file. This is different from the typical 'add to orphan dir'
2362  * operation in that the inode does not yet exist. This is a problem because
2363  * the orphan dir stringifies the inode block number to come up with it's
2364  * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2365  * problem. This function works around it by calling deeper into the orphan
2366  * and suballoc code than other callers. Use this only by necessity.
2367  * @dir: The directory which this inode will ultimately wind up under - not the
2368  * orphan dir!
2369  * @dir_bh: buffer_head the @dir inode block
2370  * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2371  * with the string to be used for orphan dirent. Pass back to the orphan dir
2372  * code.
2373  * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2374  * dir code.
2375  * @ret_di_blkno: block number where the new inode will be allocated.
2376  * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2377  * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2378  *
2379  * Returns zero on success and the ret_orphan_dir, name and lookup
2380  * fields will be populated.
2381  *
2382  * Returns non-zero on failure.
2383  */
2384 static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2385                                         struct buffer_head *dir_bh,
2386                                         char *orphan_name,
2387                                         struct inode **ret_orphan_dir,
2388                                         u64 *ret_di_blkno,
2389                                         struct ocfs2_dir_lookup_result *orphan_insert,
2390                                         struct ocfs2_alloc_context **ret_inode_ac)
2391 {
2392         int ret;
2393         u64 di_blkno;
2394         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2395         struct inode *orphan_dir = NULL;
2396         struct buffer_head *orphan_dir_bh = NULL;
2397         struct ocfs2_alloc_context *inode_ac = NULL;
2398
2399         ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2400         if (ret < 0) {
2401                 mlog_errno(ret);
2402                 return ret;
2403         }
2404
2405         /* reserve an inode spot */
2406         ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2407         if (ret < 0) {
2408                 if (ret != -ENOSPC)
2409                         mlog_errno(ret);
2410                 goto out;
2411         }
2412
2413         ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2414                                        &di_blkno);
2415         if (ret) {
2416                 mlog_errno(ret);
2417                 goto out;
2418         }
2419
2420         ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2421                                          di_blkno, orphan_name, orphan_insert,
2422                                          false);
2423         if (ret < 0) {
2424                 mlog_errno(ret);
2425                 goto out;
2426         }
2427
2428 out:
2429         if (ret == 0) {
2430                 *ret_orphan_dir = orphan_dir;
2431                 *ret_di_blkno = di_blkno;
2432                 *ret_inode_ac = inode_ac;
2433                 /*
2434                  * orphan_name and orphan_insert are already up to
2435                  * date via prepare_orphan_dir
2436                  */
2437         } else {
2438                 /* Unroll reserve_new_inode* */
2439                 if (inode_ac)
2440                         ocfs2_free_alloc_context(inode_ac);
2441
2442                 /* Unroll orphan dir locking */
2443                 mutex_unlock(&orphan_dir->i_mutex);
2444                 ocfs2_inode_unlock(orphan_dir, 1);
2445                 iput(orphan_dir);
2446         }
2447
2448         brelse(orphan_dir_bh);
2449
2450         return ret;
2451 }
2452
2453 int ocfs2_create_inode_in_orphan(struct inode *dir,
2454                                  int mode,
2455                                  struct inode **new_inode)
2456 {
2457         int status, did_quota_inode = 0;
2458         struct inode *inode = NULL;
2459         struct inode *orphan_dir = NULL;
2460         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2461         struct ocfs2_dinode *di = NULL;
2462         handle_t *handle = NULL;
2463         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2464         struct buffer_head *parent_di_bh = NULL;
2465         struct buffer_head *new_di_bh = NULL;
2466         struct ocfs2_alloc_context *inode_ac = NULL;
2467         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2468         u64 uninitialized_var(di_blkno), suballoc_loc;
2469         u16 suballoc_bit;
2470
2471         status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2472         if (status < 0) {
2473                 if (status != -ENOENT)
2474                         mlog_errno(status);
2475                 return status;
2476         }
2477
2478         status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2479                                               orphan_name, &orphan_dir,
2480                                               &di_blkno, &orphan_insert, &inode_ac);
2481         if (status < 0) {
2482                 if (status != -ENOSPC)
2483                         mlog_errno(status);
2484                 goto leave;
2485         }
2486
2487         inode = ocfs2_get_init_inode(dir, mode);
2488         if (!inode) {
2489                 status = -ENOMEM;
2490                 mlog_errno(status);
2491                 goto leave;
2492         }
2493
2494         handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2495         if (IS_ERR(handle)) {
2496                 status = PTR_ERR(handle);
2497                 handle = NULL;
2498                 mlog_errno(status);
2499                 goto leave;
2500         }
2501
2502         status = dquot_alloc_inode(inode);
2503         if (status)
2504                 goto leave;
2505         did_quota_inode = 1;
2506
2507         status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2508                                               &suballoc_loc,
2509                                               &suballoc_bit, di_blkno);
2510         if (status < 0) {
2511                 mlog_errno(status);
2512                 goto leave;
2513         }
2514
2515         clear_nlink(inode);
2516         /* do the real work now. */
2517         status = __ocfs2_mknod_locked(dir, inode,
2518                                       0, &new_di_bh, parent_di_bh, handle,
2519                                       inode_ac, di_blkno, suballoc_loc,
2520                                       suballoc_bit);
2521         if (status < 0) {
2522                 mlog_errno(status);
2523                 goto leave;
2524         }
2525
2526         di = (struct ocfs2_dinode *)new_di_bh->b_data;
2527         status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2528                                   &orphan_insert, orphan_dir, false);
2529         if (status < 0) {
2530                 mlog_errno(status);
2531                 goto leave;
2532         }
2533
2534         /* get open lock so that only nodes can't remove it from orphan dir. */
2535         status = ocfs2_open_lock(inode);
2536         if (status < 0)
2537                 mlog_errno(status);
2538
2539         insert_inode_hash(inode);
2540 leave:
2541         if (status < 0 && did_quota_inode)
2542                 dquot_free_inode(inode);
2543         if (handle)
2544                 ocfs2_commit_trans(osb, handle);
2545
2546         if (orphan_dir) {
2547                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2548                 ocfs2_inode_unlock(orphan_dir, 1);
2549                 mutex_unlock(&orphan_dir->i_mutex);
2550                 iput(orphan_dir);
2551         }
2552
2553         if ((status < 0) && inode) {
2554                 clear_nlink(inode);
2555                 iput(inode);
2556         }
2557
2558         if (inode_ac)
2559                 ocfs2_free_alloc_context(inode_ac);
2560
2561         brelse(new_di_bh);
2562
2563         if (!status)
2564                 *new_inode = inode;
2565
2566         ocfs2_free_dir_lookup_result(&orphan_insert);
2567
2568         ocfs2_inode_unlock(dir, 1);
2569         brelse(parent_di_bh);
2570         return status;
2571 }
2572
2573 static int ocfs2_dio_orphan_recovered(struct inode *inode)
2574 {
2575         int ret;
2576         struct buffer_head *di_bh = NULL;
2577         struct ocfs2_dinode *di = NULL;
2578
2579         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2580         if (ret < 0) {
2581                 mlog_errno(ret);
2582                 return 0;
2583         }
2584
2585         di = (struct ocfs2_dinode *) di_bh->b_data;
2586         ret = !(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL));
2587         ocfs2_inode_unlock(inode, 1);
2588         brelse(di_bh);
2589
2590         return ret;
2591 }
2592
2593 #define OCFS2_DIO_ORPHANED_FL_CHECK_INTERVAL 10000
2594 int ocfs2_add_inode_to_orphan(struct ocfs2_super *osb,
2595         struct inode *inode)
2596 {
2597         char orphan_name[OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN + 1];
2598         struct inode *orphan_dir_inode = NULL;
2599         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2600         struct buffer_head *di_bh = NULL;
2601         int status = 0;
2602         handle_t *handle = NULL;
2603         struct ocfs2_dinode *di = NULL;
2604
2605 restart:
2606         status = ocfs2_inode_lock(inode, &di_bh, 1);
2607         if (status < 0) {
2608                 mlog_errno(status);
2609                 goto bail;
2610         }
2611
2612         di = (struct ocfs2_dinode *) di_bh->b_data;
2613         /*
2614          * Another append dio crashed?
2615          * If so, wait for recovery first.
2616          */
2617         if (unlikely(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
2618                 ocfs2_inode_unlock(inode, 1);
2619                 brelse(di_bh);
2620                 wait_event_interruptible_timeout(OCFS2_I(inode)->append_dio_wq,
2621                                 ocfs2_dio_orphan_recovered(inode),
2622                                 msecs_to_jiffies(OCFS2_DIO_ORPHANED_FL_CHECK_INTERVAL));
2623                 goto restart;
2624         }
2625
2626         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir_inode,
2627                         OCFS2_I(inode)->ip_blkno,
2628                         orphan_name,
2629                         &orphan_insert,
2630                         true);
2631         if (status < 0) {
2632                 mlog_errno(status);
2633                 goto bail_unlock_inode;
2634         }
2635
2636         handle = ocfs2_start_trans(osb,
2637                         OCFS2_INODE_ADD_TO_ORPHAN_CREDITS);
2638         if (IS_ERR(handle)) {
2639                 status = PTR_ERR(handle);
2640                 goto bail_unlock_orphan;
2641         }
2642
2643         status = ocfs2_orphan_add(osb, handle, inode, di_bh, orphan_name,
2644                         &orphan_insert, orphan_dir_inode, true);
2645         if (status)
2646                 mlog_errno(status);
2647
2648         ocfs2_commit_trans(osb, handle);
2649
2650 bail_unlock_orphan:
2651         ocfs2_inode_unlock(orphan_dir_inode, 1);
2652         mutex_unlock(&orphan_dir_inode->i_mutex);
2653         iput(orphan_dir_inode);
2654
2655         ocfs2_free_dir_lookup_result(&orphan_insert);
2656
2657 bail_unlock_inode:
2658         ocfs2_inode_unlock(inode, 1);
2659         brelse(di_bh);
2660
2661 bail:
2662         return status;
2663 }
2664
2665 int ocfs2_del_inode_from_orphan(struct ocfs2_super *osb,
2666                 struct inode *inode, struct buffer_head *di_bh,
2667                 int update_isize, loff_t end)
2668 {
2669         struct inode *orphan_dir_inode = NULL;
2670         struct buffer_head *orphan_dir_bh = NULL;
2671         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2672         handle_t *handle = NULL;
2673         int status = 0;
2674
2675         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2676                         ORPHAN_DIR_SYSTEM_INODE,
2677                         le16_to_cpu(di->i_dio_orphaned_slot));
2678         if (!orphan_dir_inode) {
2679                 status = -ENOENT;
2680                 mlog_errno(status);
2681                 goto bail;
2682         }
2683
2684         mutex_lock(&orphan_dir_inode->i_mutex);
2685         status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2686         if (status < 0) {
2687                 mutex_unlock(&orphan_dir_inode->i_mutex);
2688                 iput(orphan_dir_inode);
2689                 mlog_errno(status);
2690                 goto bail;
2691         }
2692
2693         handle = ocfs2_start_trans(osb,
2694                         OCFS2_INODE_DEL_FROM_ORPHAN_CREDITS);
2695         if (IS_ERR(handle)) {
2696                 status = PTR_ERR(handle);
2697                 goto bail_unlock_orphan;
2698         }
2699
2700         BUG_ON(!(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)));
2701
2702         status = ocfs2_orphan_del(osb, handle, orphan_dir_inode,
2703                                 inode, orphan_dir_bh, true);
2704         if (status < 0) {
2705                 mlog_errno(status);
2706                 goto bail_commit;
2707         }
2708
2709         status = ocfs2_journal_access_di(handle,
2710                         INODE_CACHE(inode),
2711                         di_bh,
2712                         OCFS2_JOURNAL_ACCESS_WRITE);
2713         if (status < 0) {
2714                 mlog_errno(status);
2715                 goto bail_commit;
2716         }
2717
2718         di->i_flags &= ~cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
2719         di->i_dio_orphaned_slot = 0;
2720
2721         if (update_isize) {
2722                 status = ocfs2_set_inode_size(handle, inode, di_bh, end);
2723                 if (status)
2724                         mlog_errno(status);
2725         } else
2726                 ocfs2_journal_dirty(handle, di_bh);
2727
2728 bail_commit:
2729         ocfs2_commit_trans(osb, handle);
2730
2731 bail_unlock_orphan:
2732         ocfs2_inode_unlock(orphan_dir_inode, 1);
2733         mutex_unlock(&orphan_dir_inode->i_mutex);
2734         brelse(orphan_dir_bh);
2735         iput(orphan_dir_inode);
2736
2737 bail:
2738         return status;
2739 }
2740
2741 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2742                                    struct inode *inode,
2743                                    struct dentry *dentry)
2744 {
2745         int status = 0;
2746         struct buffer_head *parent_di_bh = NULL;
2747         handle_t *handle = NULL;
2748         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2749         struct ocfs2_dinode *dir_di, *di;
2750         struct inode *orphan_dir_inode = NULL;
2751         struct buffer_head *orphan_dir_bh = NULL;
2752         struct buffer_head *di_bh = NULL;
2753         struct ocfs2_dir_lookup_result lookup = { NULL, };
2754
2755         trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
2756                                 dentry->d_name.len, dentry->d_name.name,
2757                                 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2758                                 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2759
2760         status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2761         if (status < 0) {
2762                 if (status != -ENOENT)
2763                         mlog_errno(status);
2764                 return status;
2765         }
2766
2767         dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2768         if (!dir_di->i_links_count) {
2769                 /* can't make a file in a deleted directory. */
2770                 status = -ENOENT;
2771                 goto leave;
2772         }
2773
2774         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2775                                            dentry->d_name.len);
2776         if (status)
2777                 goto leave;
2778
2779         /* get a spot inside the dir. */
2780         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2781                                               dentry->d_name.name,
2782                                               dentry->d_name.len, &lookup);
2783         if (status < 0) {
2784                 mlog_errno(status);
2785                 goto leave;
2786         }
2787
2788         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2789                                                        ORPHAN_DIR_SYSTEM_INODE,
2790                                                        osb->slot_num);
2791         if (!orphan_dir_inode) {
2792                 status = -ENOENT;
2793                 mlog_errno(status);
2794                 goto leave;
2795         }
2796
2797         mutex_lock(&orphan_dir_inode->i_mutex);
2798
2799         status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2800         if (status < 0) {
2801                 mlog_errno(status);
2802                 mutex_unlock(&orphan_dir_inode->i_mutex);
2803                 iput(orphan_dir_inode);
2804                 goto leave;
2805         }
2806
2807         status = ocfs2_read_inode_block(inode, &di_bh);
2808         if (status < 0) {
2809                 mlog_errno(status);
2810                 goto orphan_unlock;
2811         }
2812
2813         handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2814         if (IS_ERR(handle)) {
2815                 status = PTR_ERR(handle);
2816                 handle = NULL;
2817                 mlog_errno(status);
2818                 goto orphan_unlock;
2819         }
2820
2821         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2822                                          di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2823         if (status < 0) {
2824                 mlog_errno(status);
2825                 goto out_commit;
2826         }
2827
2828         status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2829                                   orphan_dir_bh, false);
2830         if (status < 0) {
2831                 mlog_errno(status);
2832                 goto out_commit;
2833         }
2834
2835         di = (struct ocfs2_dinode *)di_bh->b_data;
2836         di->i_flags &= ~cpu_to_le32(OCFS2_ORPHANED_FL);
2837         di->i_orphaned_slot = 0;
2838         set_nlink(inode, 1);
2839         ocfs2_set_links_count(di, inode->i_nlink);
2840         ocfs2_update_inode_fsync_trans(handle, inode, 1);
2841         ocfs2_journal_dirty(handle, di_bh);
2842
2843         status = ocfs2_add_entry(handle, dentry, inode,
2844                                  OCFS2_I(inode)->ip_blkno, parent_di_bh,
2845                                  &lookup);
2846         if (status < 0) {
2847                 mlog_errno(status);
2848                 goto out_commit;
2849         }
2850
2851         status = ocfs2_dentry_attach_lock(dentry, inode,
2852                                           OCFS2_I(dir)->ip_blkno);
2853         if (status) {
2854                 mlog_errno(status);
2855                 goto out_commit;
2856         }
2857
2858         d_instantiate(dentry, inode);
2859         status = 0;
2860 out_commit:
2861         ocfs2_commit_trans(osb, handle);
2862 orphan_unlock:
2863         ocfs2_inode_unlock(orphan_dir_inode, 1);
2864         mutex_unlock(&orphan_dir_inode->i_mutex);
2865         iput(orphan_dir_inode);
2866 leave:
2867
2868         ocfs2_inode_unlock(dir, 1);
2869
2870         brelse(di_bh);
2871         brelse(parent_di_bh);
2872         brelse(orphan_dir_bh);
2873
2874         ocfs2_free_dir_lookup_result(&lookup);
2875
2876         if (status)
2877                 mlog_errno(status);
2878
2879         return status;
2880 }
2881
2882 const struct inode_operations ocfs2_dir_iops = {
2883         .create         = ocfs2_create,
2884         .lookup         = ocfs2_lookup,
2885         .link           = ocfs2_link,
2886         .unlink         = ocfs2_unlink,
2887         .rmdir          = ocfs2_unlink,
2888         .symlink        = ocfs2_symlink,
2889         .mkdir          = ocfs2_mkdir,
2890         .mknod          = ocfs2_mknod,
2891         .rename         = ocfs2_rename,
2892         .setattr        = ocfs2_setattr,
2893         .getattr        = ocfs2_getattr,
2894         .permission     = ocfs2_permission,
2895         .setxattr       = generic_setxattr,
2896         .getxattr       = generic_getxattr,
2897         .listxattr      = ocfs2_listxattr,
2898         .removexattr    = generic_removexattr,
2899         .fiemap         = ocfs2_fiemap,
2900         .get_acl        = ocfs2_iop_get_acl,
2901         .set_acl        = ocfs2_iop_set_acl,
2902 };