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namei.c

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * namei.c
 *
 * Create and rename file, directory, symlinks
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 *
 *  Portions of this code from linux/fs/ext3/dir.c
 *
 *  Copyright (C) 1992, 1993, 1994, 1995
 *  Remy Card (card@masi.ibp.fr)
 *  Laboratoire MASI - Institut Blaise pascal
 *  Universite Pierre et Marie Curie (Paris VI)
 *
 *   from
 *
 *   linux/fs/minix/dir.c
 *
 *   Copyright (C) 1991, 1992 Linux Torvalds
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>

#define MLOG_MASK_PREFIX ML_NAMEI
#include <cluster/masklog.h>

#include "ocfs2.h"

#include "alloc.h"
#include "dcache.h"
#include "dir.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "file.h"
#include "inode.h"
#include "journal.h"
#include "namei.h"
#include "suballoc.h"
#include "super.h"
#include "symlink.h"
#include "sysfile.h"
#include "uptodate.h"
#include "vote.h"

#include "buffer_head_io.h"

static int ocfs2_mknod_locked(struct ocfs2_super *osb,
                        struct inode *dir,
                        struct dentry *dentry, int mode,
                        dev_t dev,
                        struct buffer_head **new_fe_bh,
                        struct buffer_head *parent_fe_bh,
                        handle_t *handle,
                        struct inode **ret_inode,
                        struct ocfs2_alloc_context *inode_ac);

static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
                            struct inode **ret_orphan_dir,
                            struct inode *inode,
                            char *name,
                            struct buffer_head **de_bh);

static int ocfs2_orphan_add(struct ocfs2_super *osb,
                      handle_t *handle,
                      struct inode *inode,
                      struct ocfs2_dinode *fe,
                      char *name,
                      struct buffer_head *de_bh,
                      struct inode *orphan_dir_inode);

static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
                             handle_t *handle,
                             struct inode *inode,
                             const char *symname);

/* An orphan dir name is an 8 byte value, printed as a hex string */
#define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))

static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
                           struct nameidata *nd)
{
      int status;
      u64 blkno;
      struct inode *inode = NULL;
      struct dentry *ret;
      struct ocfs2_inode_info *oi;

      mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
               dentry->d_name.len, dentry->d_name.name);

      if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
            ret = ERR_PTR(-ENAMETOOLONG);
            goto bail;
      }

      mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
           dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);

      status = ocfs2_meta_lock(dir, NULL, 0);
      if (status < 0) {
            if (status != -ENOENT)
                  mlog_errno(status);
            ret = ERR_PTR(status);
            goto bail;
      }

      status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
                                  dentry->d_name.len, &blkno);
      if (status < 0)
            goto bail_add;

      inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
      if (IS_ERR(inode)) {
            ret = ERR_PTR(-EACCES);
            goto bail_unlock;
      }

      oi = OCFS2_I(inode);
      /* Clear any orphaned state... If we were able to look up the
       * inode from a directory, it certainly can't be orphaned. We
       * might have the bad state from a node which intended to
       * orphan this inode but crashed before it could commit the
       * unlink. */
      spin_lock(&oi->ip_lock);
      oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
      spin_unlock(&oi->ip_lock);

bail_add:
      dentry->d_op = &ocfs2_dentry_ops;
      ret = d_splice_alias(inode, dentry);

      if (inode) {
            /*
             * If d_splice_alias() finds a DCACHE_DISCONNECTED
             * dentry, it will d_move() it on top of ourse. The
             * return value will indicate this however, so in
             * those cases, we switch them around for the locking
             * code.
             *
             * NOTE: This dentry already has ->d_op set from
             * ocfs2_get_parent() and ocfs2_get_dentry()
             */
            if (ret)
                  dentry = ret;

            status = ocfs2_dentry_attach_lock(dentry, inode,
                                      OCFS2_I(dir)->ip_blkno);
            if (status) {
                  mlog_errno(status);
                  ret = ERR_PTR(status);
                  goto bail_unlock;
            }
      }

bail_unlock:
      /* Don't drop the cluster lock until *after* the d_add --
       * unlink on another node will message us to remove that
       * dentry under this lock so otherwise we can race this with
       * the vote thread and have a stale dentry. */
      ocfs2_meta_unlock(dir, 0);

bail:

      mlog_exit_ptr(ret);

      return ret;
}

static int ocfs2_mknod(struct inode *dir,
                   struct dentry *dentry,
                   int mode,
                   dev_t dev)
{
      int status = 0;
      struct buffer_head *parent_fe_bh = NULL;
      handle_t *handle = NULL;
      struct ocfs2_super *osb;
      struct ocfs2_dinode *dirfe;
      struct buffer_head *new_fe_bh = NULL;
      struct buffer_head *de_bh = NULL;
      struct inode *inode = NULL;
      struct ocfs2_alloc_context *inode_ac = NULL;
      struct ocfs2_alloc_context *data_ac = NULL;

      mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
               (unsigned long)dev, dentry->d_name.len,
               dentry->d_name.name);

      /* get our super block */
      osb = OCFS2_SB(dir->i_sb);

      status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
      if (status < 0) {
            if (status != -ENOENT)
                  mlog_errno(status);
            return status;
      }

      if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
            status = -EMLINK;
            goto leave;
      }

      dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
      if (!dirfe->i_links_count) {
            /* can't make a file in a deleted directory. */
            status = -ENOENT;
            goto leave;
      }

      status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
                                 dentry->d_name.len);
      if (status)
            goto leave;

      /* get a spot inside the dir. */
      status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
                                    dentry->d_name.name,
                                    dentry->d_name.len, &de_bh);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      /* reserve an inode spot */
      status = ocfs2_reserve_new_inode(osb, &inode_ac);
      if (status < 0) {
            if (status != -ENOSPC)
                  mlog_errno(status);
            goto leave;
      }

      /* Reserve a cluster if creating an extent based directory. */
      if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
            status = ocfs2_reserve_clusters(osb, 1, &data_ac);
            if (status < 0) {
                  if (status != -ENOSPC)
                        mlog_errno(status);
                  goto leave;
            }
      }

      handle = ocfs2_start_trans(osb, OCFS2_MKNOD_CREDITS);
      if (IS_ERR(handle)) {
            status = PTR_ERR(handle);
            handle = NULL;
            mlog_errno(status);
            goto leave;
      }

      /* do the real work now. */
      status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
                            &new_fe_bh, parent_fe_bh, handle,
                            &inode, inode_ac);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      if (S_ISDIR(mode)) {
            status = ocfs2_fill_new_dir(osb, handle, dir, inode,
                                  new_fe_bh, data_ac);
            if (status < 0) {
                  mlog_errno(status);
                  goto leave;
            }

            status = ocfs2_journal_access(handle, dir, parent_fe_bh,
                                    OCFS2_JOURNAL_ACCESS_WRITE);
            if (status < 0) {
                  mlog_errno(status);
                  goto leave;
            }
            le16_add_cpu(&dirfe->i_links_count, 1);
            status = ocfs2_journal_dirty(handle, parent_fe_bh);
            if (status < 0) {
                  mlog_errno(status);
                  goto leave;
            }
            inc_nlink(dir);
      }

      status = ocfs2_add_entry(handle, dentry, inode,
                         OCFS2_I(inode)->ip_blkno, parent_fe_bh,
                         de_bh);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_dentry_attach_lock(dentry, inode,
                                OCFS2_I(dir)->ip_blkno);
      if (status) {
            mlog_errno(status);
            goto leave;
      }

      insert_inode_hash(inode);
      dentry->d_op = &ocfs2_dentry_ops;
      d_instantiate(dentry, inode);
      status = 0;
leave:
      if (handle)
            ocfs2_commit_trans(osb, handle);

      ocfs2_meta_unlock(dir, 1);

      if (status == -ENOSPC)
            mlog(0, "Disk is full\n");

      if (new_fe_bh)
            brelse(new_fe_bh);

      if (de_bh)
            brelse(de_bh);

      if (parent_fe_bh)
            brelse(parent_fe_bh);

      if ((status < 0) && inode)
            iput(inode);

      if (inode_ac)
            ocfs2_free_alloc_context(inode_ac);

      if (data_ac)
            ocfs2_free_alloc_context(data_ac);

      mlog_exit(status);

      return status;
}

static int ocfs2_mknod_locked(struct ocfs2_super *osb,
                        struct inode *dir,
                        struct dentry *dentry, int mode,
                        dev_t dev,
                        struct buffer_head **new_fe_bh,
                        struct buffer_head *parent_fe_bh,
                        handle_t *handle,
                        struct inode **ret_inode,
                        struct ocfs2_alloc_context *inode_ac)
{
      int status = 0;
      struct ocfs2_dinode *fe = NULL;
      struct ocfs2_extent_list *fel;
      u64 fe_blkno = 0;
      u16 suballoc_bit;
      struct inode *inode = NULL;

      mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
               (unsigned long)dev, dentry->d_name.len,
               dentry->d_name.name);

      *new_fe_bh = NULL;
      *ret_inode = NULL;

      status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
                               &fe_blkno);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      inode = new_inode(dir->i_sb);
      if (IS_ERR(inode)) {
            status = PTR_ERR(inode);
            mlog(ML_ERROR, "new_inode failed!\n");
            goto leave;
      }

      /* populate as many fields early on as possible - many of
       * these are used by the support functions here and in
       * callers. */
      inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
      OCFS2_I(inode)->ip_blkno = fe_blkno;
      if (S_ISDIR(mode))
            inode->i_nlink = 2;
      else
            inode->i_nlink = 1;
      inode->i_mode = mode;
      spin_lock(&osb->osb_lock);
      inode->i_generation = osb->s_next_generation++;
      spin_unlock(&osb->osb_lock);

      *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
      if (!*new_fe_bh) {
            status = -EIO;
            mlog_errno(status);
            goto leave;
      }
      ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);

      status = ocfs2_journal_access(handle, inode, *new_fe_bh,
                              OCFS2_JOURNAL_ACCESS_CREATE);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
      memset(fe, 0, osb->sb->s_blocksize);

      fe->i_generation = cpu_to_le32(inode->i_generation);
      fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
      fe->i_blkno = cpu_to_le64(fe_blkno);
      fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
      fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
      fe->i_uid = cpu_to_le32(current->fsuid);
      if (dir->i_mode & S_ISGID) {
            fe->i_gid = cpu_to_le32(dir->i_gid);
            if (S_ISDIR(mode))
                  mode |= S_ISGID;
      } else
            fe->i_gid = cpu_to_le32(current->fsgid);
      fe->i_mode = cpu_to_le16(mode);
      if (S_ISCHR(mode) || S_ISBLK(mode))
            fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));

      fe->i_links_count = cpu_to_le16(inode->i_nlink);

      fe->i_last_eb_blk = 0;
      strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
      le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
      fe->i_atime = fe->i_ctime = fe->i_mtime =
            cpu_to_le64(CURRENT_TIME.tv_sec);
      fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
            cpu_to_le32(CURRENT_TIME.tv_nsec);
      fe->i_dtime = 0;

      /*
       * If supported, directories start with inline data.
       */
      if (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) {
            u16 feat = le16_to_cpu(fe->i_dyn_features);

            fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);

            fe->id2.i_data.id_count = cpu_to_le16(ocfs2_max_inline_data(osb->sb));
      } else {
            fel = &fe->id2.i_list;
            fel->l_tree_depth = 0;
            fel->l_next_free_rec = 0;
            fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
      }

      status = ocfs2_journal_dirty(handle, *new_fe_bh);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      if (ocfs2_populate_inode(inode, fe, 1) < 0) {
            mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
                 "i_blkno=%llu, i_ino=%lu\n",
                 (unsigned long long)(*new_fe_bh)->b_blocknr,
                 (unsigned long long)le64_to_cpu(fe->i_blkno),
                 inode->i_ino);
            BUG();
      }

      ocfs2_inode_set_new(osb, inode);
      if (!ocfs2_mount_local(osb)) {
            status = ocfs2_create_new_inode_locks(inode);
            if (status < 0)
                  mlog_errno(status);
      }

      status = 0; /* error in ocfs2_create_new_inode_locks is not
                 * critical */

      *ret_inode = inode;
leave:
      if (status < 0) {
            if (*new_fe_bh) {
                  brelse(*new_fe_bh);
                  *new_fe_bh = NULL;
            }
            if (inode)
                  iput(inode);
      }

      mlog_exit(status);
      return status;
}

static int ocfs2_mkdir(struct inode *dir,
                   struct dentry *dentry,
                   int mode)
{
      int ret;

      mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
               dentry->d_name.len, dentry->d_name.name);
      ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
      mlog_exit(ret);

      return ret;
}

static int ocfs2_create(struct inode *dir,
                  struct dentry *dentry,
                  int mode,
                  struct nameidata *nd)
{
      int ret;

      mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
               dentry->d_name.len, dentry->d_name.name);
      ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
      mlog_exit(ret);

      return ret;
}

static int ocfs2_link(struct dentry *old_dentry,
                  struct inode *dir,
                  struct dentry *dentry)
{
      handle_t *handle;
      struct inode *inode = old_dentry->d_inode;
      int err;
      struct buffer_head *fe_bh = NULL;
      struct buffer_head *parent_fe_bh = NULL;
      struct buffer_head *de_bh = NULL;
      struct ocfs2_dinode *fe = NULL;
      struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);

      mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
               old_dentry->d_name.len, old_dentry->d_name.name,
               dentry->d_name.len, dentry->d_name.name);

      if (S_ISDIR(inode->i_mode))
            return -EPERM;

      err = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
      if (err < 0) {
            if (err != -ENOENT)
                  mlog_errno(err);
            return err;
      }

      if (!dir->i_nlink) {
            err = -ENOENT;
            goto out;
      }

      err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
                              dentry->d_name.len);
      if (err)
            goto out;

      err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
                                 dentry->d_name.name,
                                 dentry->d_name.len, &de_bh);
      if (err < 0) {
            mlog_errno(err);
            goto out;
      }

      err = ocfs2_meta_lock(inode, &fe_bh, 1);
      if (err < 0) {
            if (err != -ENOENT)
                  mlog_errno(err);
            goto out;
      }

      fe = (struct ocfs2_dinode *) fe_bh->b_data;
      if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
            err = -EMLINK;
            goto out_unlock_inode;
      }

      handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
      if (IS_ERR(handle)) {
            err = PTR_ERR(handle);
            handle = NULL;
            mlog_errno(err);
            goto out_unlock_inode;
      }

      err = ocfs2_journal_access(handle, inode, fe_bh,
                           OCFS2_JOURNAL_ACCESS_WRITE);
      if (err < 0) {
            mlog_errno(err);
            goto out_commit;
      }

      inc_nlink(inode);
      inode->i_ctime = CURRENT_TIME;
      fe->i_links_count = cpu_to_le16(inode->i_nlink);
      fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
      fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);

      err = ocfs2_journal_dirty(handle, fe_bh);
      if (err < 0) {
            le16_add_cpu(&fe->i_links_count, -1);
            drop_nlink(inode);
            mlog_errno(err);
            goto out_commit;
      }

      err = ocfs2_add_entry(handle, dentry, inode,
                        OCFS2_I(inode)->ip_blkno,
                        parent_fe_bh, de_bh);
      if (err) {
            le16_add_cpu(&fe->i_links_count, -1);
            drop_nlink(inode);
            mlog_errno(err);
            goto out_commit;
      }

      err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
      if (err) {
            mlog_errno(err);
            goto out_commit;
      }

      atomic_inc(&inode->i_count);
      dentry->d_op = &ocfs2_dentry_ops;
      d_instantiate(dentry, inode);

out_commit:
      ocfs2_commit_trans(osb, handle);
out_unlock_inode:
      ocfs2_meta_unlock(inode, 1);

out:
      ocfs2_meta_unlock(dir, 1);

      if (de_bh)
            brelse(de_bh);
      if (fe_bh)
            brelse(fe_bh);
      if (parent_fe_bh)
            brelse(parent_fe_bh);

      mlog_exit(err);

      return err;
}

/*
 * Takes and drops an exclusive lock on the given dentry. This will
 * force other nodes to drop it.
 */
static int ocfs2_remote_dentry_delete(struct dentry *dentry)
{
      int ret;

      ret = ocfs2_dentry_lock(dentry, 1);
      if (ret)
            mlog_errno(ret);
      else
            ocfs2_dentry_unlock(dentry, 1);

      return ret;
}

static inline int inode_is_unlinkable(struct inode *inode)
{
      if (S_ISDIR(inode->i_mode)) {
            if (inode->i_nlink == 2)
                  return 1;
            return 0;
      }

      if (inode->i_nlink == 1)
            return 1;
      return 0;
}

static int ocfs2_unlink(struct inode *dir,
                  struct dentry *dentry)
{
      int status;
      int child_locked = 0;
      struct inode *inode = dentry->d_inode;
      struct inode *orphan_dir = NULL;
      struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
      u64 blkno;
      struct ocfs2_dinode *fe = NULL;
      struct buffer_head *fe_bh = NULL;
      struct buffer_head *parent_node_bh = NULL;
      handle_t *handle = NULL;
      struct ocfs2_dir_entry *dirent = NULL;
      struct buffer_head *dirent_bh = NULL;
      char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
      struct buffer_head *orphan_entry_bh = NULL;

      mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
               dentry->d_name.len, dentry->d_name.name);

      BUG_ON(dentry->d_parent->d_inode != dir);

      mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);

      if (inode == osb->root_inode) {
            mlog(0, "Cannot delete the root directory\n");
            return -EPERM;
      }

      status = ocfs2_meta_lock(dir, &parent_node_bh, 1);
      if (status < 0) {
            if (status != -ENOENT)
                  mlog_errno(status);
            return status;
      }

      status = ocfs2_find_files_on_disk(dentry->d_name.name,
                                dentry->d_name.len, &blkno,
                                dir, &dirent_bh, &dirent);
      if (status < 0) {
            if (status != -ENOENT)
                  mlog_errno(status);
            goto leave;
      }

      if (OCFS2_I(inode)->ip_blkno != blkno) {
            status = -ENOENT;

            mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
                 (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
            goto leave;
      }

      status = ocfs2_meta_lock(inode, &fe_bh, 1);
      if (status < 0) {
            if (status != -ENOENT)
                  mlog_errno(status);
            goto leave;
      }
      child_locked = 1;

      if (S_ISDIR(inode->i_mode)) {
                  if (!ocfs2_empty_dir(inode)) {
                  status = -ENOTEMPTY;
                  goto leave;
            } else if (inode->i_nlink != 2) {
                  status = -ENOTEMPTY;
                  goto leave;
            }
      }

      status = ocfs2_remote_dentry_delete(dentry);
      if (status < 0) {
            /* This vote should succeed under all normal
             * circumstances. */
            mlog_errno(status);
            goto leave;
      }

      if (inode_is_unlinkable(inode)) {
            status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
                                      orphan_name,
                                      &orphan_entry_bh);
            if (status < 0) {
                  mlog_errno(status);
                  goto leave;
            }
      }

      handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
      if (IS_ERR(handle)) {
            status = PTR_ERR(handle);
            handle = NULL;
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_journal_access(handle, inode, fe_bh,
                              OCFS2_JOURNAL_ACCESS_WRITE);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      fe = (struct ocfs2_dinode *) fe_bh->b_data;

      if (inode_is_unlinkable(inode)) {
            status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
                                orphan_entry_bh, orphan_dir);
            if (status < 0) {
                  mlog_errno(status);
                  goto leave;
            }
      }

      /* delete the name from the parent dir */
      status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      if (S_ISDIR(inode->i_mode))
            drop_nlink(inode);
      drop_nlink(inode);
      fe->i_links_count = cpu_to_le16(inode->i_nlink);

      status = ocfs2_journal_dirty(handle, fe_bh);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      dir->i_ctime = dir->i_mtime = CURRENT_TIME;
      if (S_ISDIR(inode->i_mode))
            drop_nlink(dir);

      status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
      if (status < 0) {
            mlog_errno(status);
            if (S_ISDIR(inode->i_mode))
                  inc_nlink(dir);
      }

leave:
      if (handle)
            ocfs2_commit_trans(osb, handle);

      if (child_locked)
            ocfs2_meta_unlock(inode, 1);

      ocfs2_meta_unlock(dir, 1);

      if (orphan_dir) {
            /* This was locked for us in ocfs2_prepare_orphan_dir() */
            ocfs2_meta_unlock(orphan_dir, 1);
            mutex_unlock(&orphan_dir->i_mutex);
            iput(orphan_dir);
      }

      if (fe_bh)
            brelse(fe_bh);

      if (dirent_bh)
            brelse(dirent_bh);

      if (parent_node_bh)
            brelse(parent_node_bh);

      if (orphan_entry_bh)
            brelse(orphan_entry_bh);

      mlog_exit(status);

      return status;
}

/*
 * The only place this should be used is rename!
 * if they have the same id, then the 1st one is the only one locked.
 */
static int ocfs2_double_lock(struct ocfs2_super *osb,
                       struct buffer_head **bh1,
                       struct inode *inode1,
                       struct buffer_head **bh2,
                       struct inode *inode2)
{
      int status;
      struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
      struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
      struct buffer_head **tmpbh;
      struct inode *tmpinode;

      mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
               (unsigned long long)oi1->ip_blkno,
               (unsigned long long)oi2->ip_blkno);

      if (*bh1)
            *bh1 = NULL;
      if (*bh2)
            *bh2 = NULL;

      /* we always want to lock the one with the lower lockid first. */
      if (oi1->ip_blkno != oi2->ip_blkno) {
            if (oi1->ip_blkno < oi2->ip_blkno) {
                  /* switch id1 and id2 around */
                  mlog(0, "switching them around...\n");
                  tmpbh = bh2;
                  bh2 = bh1;
                  bh1 = tmpbh;

                  tmpinode = inode2;
                  inode2 = inode1;
                  inode1 = tmpinode;
            }
            /* lock id2 */
            status = ocfs2_meta_lock(inode2, bh2, 1);
            if (status < 0) {
                  if (status != -ENOENT)
                        mlog_errno(status);
                  goto bail;
            }
      }

      /* lock id1 */
      status = ocfs2_meta_lock(inode1, bh1, 1);
      if (status < 0) {
            /*
             * An error return must mean that no cluster locks
             * were held on function exit.
             */
            if (oi1->ip_blkno != oi2->ip_blkno)
                  ocfs2_meta_unlock(inode2, 1);

            if (status != -ENOENT)
                  mlog_errno(status);
      }

bail:
      mlog_exit(status);
      return status;
}

static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
{
      ocfs2_meta_unlock(inode1, 1);

      if (inode1 != inode2)
            ocfs2_meta_unlock(inode2, 1);
}

static int ocfs2_rename(struct inode *old_dir,
                  struct dentry *old_dentry,
                  struct inode *new_dir,
                  struct dentry *new_dentry)
{
      int status = 0, rename_lock = 0, parents_locked = 0;
      int old_child_locked = 0, new_child_locked = 0;
      struct inode *old_inode = old_dentry->d_inode;
      struct inode *new_inode = new_dentry->d_inode;
      struct inode *orphan_dir = NULL;
      struct ocfs2_dinode *newfe = NULL;
      char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
      struct buffer_head *orphan_entry_bh = NULL;
      struct buffer_head *newfe_bh = NULL;
      struct buffer_head *old_inode_bh = NULL;
      struct buffer_head *insert_entry_bh = NULL;
      struct ocfs2_super *osb = NULL;
      u64 newfe_blkno, old_de_ino;
      handle_t *handle = NULL;
      struct buffer_head *old_dir_bh = NULL;
      struct buffer_head *new_dir_bh = NULL;
      struct ocfs2_dir_entry *old_inode_dot_dot_de = NULL, *old_de = NULL,
            *new_de = NULL;
      struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
      struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
                                        // this is the 1st dirent bh
      nlink_t old_dir_nlink = old_dir->i_nlink;
      struct ocfs2_dinode *old_di;

      /* At some point it might be nice to break this function up a
       * bit. */

      mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
               old_dir, old_dentry, new_dir, new_dentry,
               old_dentry->d_name.len, old_dentry->d_name.name,
               new_dentry->d_name.len, new_dentry->d_name.name);

      osb = OCFS2_SB(old_dir->i_sb);

      if (new_inode) {
            if (!igrab(new_inode))
                  BUG();
      }

      /* Assume a directory hierarchy thusly:
       * a/b/c
       * a/d
       * a,b,c, and d are all directories.
       *
       * from cwd of 'a' on both nodes:
       * node1: mv b/c d
       * node2: mv d   b/c
       *
       * And that's why, just like the VFS, we need a file system
       * rename lock. */
      if (old_dentry != new_dentry) {
            status = ocfs2_rename_lock(osb);
            if (status < 0) {
                  mlog_errno(status);
                  goto bail;
            }
            rename_lock = 1;
      }

      /* if old and new are the same, this'll just do one lock. */
      status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
                           &new_dir_bh, new_dir);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }
      parents_locked = 1;

      /* make sure both dirs have bhs
       * get an extra ref on old_dir_bh if old==new */
      if (!new_dir_bh) {
            if (old_dir_bh) {
                  new_dir_bh = old_dir_bh;
                  get_bh(new_dir_bh);
            } else {
                  mlog(ML_ERROR, "no old_dir_bh!\n");
                  status = -EIO;
                  goto bail;
            }
      }

      /*
       * Aside from allowing a meta data update, the locking here
       * also ensures that the vote thread on other nodes won't have
       * to concurrently downconvert the inode and the dentry locks.
       */
      status = ocfs2_meta_lock(old_inode, &old_inode_bh, 1);
      if (status < 0) {
            if (status != -ENOENT)
                  mlog_errno(status);
            goto bail;
      }
      old_child_locked = 1;

      status = ocfs2_remote_dentry_delete(old_dentry);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      if (S_ISDIR(old_inode->i_mode)) {
            u64 old_inode_parent;

            status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
                                      old_inode, &old_inode_de_bh,
                                      &old_inode_dot_dot_de);
            if (status) {
                  status = -EIO;
                  goto bail;
            }

            if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
                  status = -EIO;
                  goto bail;
            }

            if (!new_inode && new_dir != old_dir &&
                new_dir->i_nlink >= OCFS2_LINK_MAX) {
                  status = -EMLINK;
                  goto bail;
            }
      }

      status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
                                  old_dentry->d_name.len,
                                  &old_de_ino);
      if (status) {
            status = -ENOENT;
            goto bail;
      }

      /*
       *  Check for inode number is _not_ due to possible IO errors.
       *  We might rmdir the source, keep it as pwd of some process
       *  and merrily kill the link to whatever was created under the
       *  same name. Goodbye sticky bit ;-<
       */
      if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
            status = -ENOENT;
            goto bail;
      }

      /* check if the target already exists (in which case we need
       * to delete it */
      status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
                                new_dentry->d_name.len,
                                &newfe_blkno, new_dir, &new_de_bh,
                                &new_de);
      /* The only error we allow here is -ENOENT because the new
       * file not existing is perfectly valid. */
      if ((status < 0) && (status != -ENOENT)) {
            /* If we cannot find the file specified we should just */
            /* return the error... */
            mlog_errno(status);
            goto bail;
      }

      if (!new_de && new_inode) {
            /*
             * Target was unlinked by another node while we were
             * waiting to get to ocfs2_rename(). There isn't
             * anything we can do here to help the situation, so
             * bubble up the appropriate error.
             */
            status = -ENOENT;
            goto bail;
      }

      /* In case we need to overwrite an existing file, we blow it
       * away first */
      if (new_de) {
            /* VFS didn't think there existed an inode here, but
             * someone else in the cluster must have raced our
             * rename to create one. Today we error cleanly, in
             * the future we should consider calling iget to build
             * a new struct inode for this entry. */
            if (!new_inode) {
                  status = -EACCES;

                  mlog(0, "We found an inode for name %.*s but VFS "
                       "didn't give us one.\n", new_dentry->d_name.len,
                       new_dentry->d_name.name);
                  goto bail;
            }

            if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
                  status = -EACCES;

                  mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
                       (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
                       (unsigned long long)newfe_blkno,
                       OCFS2_I(new_inode)->ip_flags);
                  goto bail;
            }

            status = ocfs2_meta_lock(new_inode, &newfe_bh, 1);
            if (status < 0) {
                  if (status != -ENOENT)
                        mlog_errno(status);
                  goto bail;
            }
            new_child_locked = 1;

            status = ocfs2_remote_dentry_delete(new_dentry);
            if (status < 0) {
                  mlog_errno(status);
                  goto bail;
            }

            newfe = (struct ocfs2_dinode *) newfe_bh->b_data;

            mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
                 "newfebh=%p bhblocknr=%llu\n", new_de,
                 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
                 (unsigned long long)newfe_bh->b_blocknr : 0ULL);

            if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
                  status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
                                            new_inode,
                                            orphan_name,
                                            &orphan_entry_bh);
                  if (status < 0) {
                        mlog_errno(status);
                        goto bail;
                  }
            }
      } else {
            BUG_ON(new_dentry->d_parent->d_inode != new_dir);

            status = ocfs2_check_dir_for_entry(new_dir,
                                       new_dentry->d_name.name,
                                       new_dentry->d_name.len);
            if (status)
                  goto bail;

            status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
                                          new_dentry->d_name.name,
                                          new_dentry->d_name.len,
                                          &insert_entry_bh);
            if (status < 0) {
                  mlog_errno(status);
                  goto bail;
            }
      }

      handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
      if (IS_ERR(handle)) {
            status = PTR_ERR(handle);
            handle = NULL;
            mlog_errno(status);
            goto bail;
      }

      if (new_de) {
            if (S_ISDIR(new_inode->i_mode)) {
                  if (!ocfs2_empty_dir(new_inode) ||
                      new_inode->i_nlink != 2) {
                        status = -ENOTEMPTY;
                        goto bail;
                  }
            }
            status = ocfs2_journal_access(handle, new_inode, newfe_bh,
                                    OCFS2_JOURNAL_ACCESS_WRITE);
            if (status < 0) {
                  mlog_errno(status);
                  goto bail;
            }

            if (S_ISDIR(new_inode->i_mode) ||
                (newfe->i_links_count == cpu_to_le16(1))){
                  status = ocfs2_orphan_add(osb, handle, new_inode,
                                      newfe, orphan_name,
                                      orphan_entry_bh, orphan_dir);
                  if (status < 0) {
                        mlog_errno(status);
                        goto bail;
                  }
            }

            /* change the dirent to point to the correct inode */
            status = ocfs2_update_entry(new_dir, handle, new_de_bh,
                                  new_de, old_inode);
            if (status < 0) {
                  mlog_errno(status);
                  goto bail;
            }
            new_dir->i_version++;

            if (S_ISDIR(new_inode->i_mode))
                  newfe->i_links_count = 0;
            else
                  le16_add_cpu(&newfe->i_links_count, -1);

            status = ocfs2_journal_dirty(handle, newfe_bh);
            if (status < 0) {
                  mlog_errno(status);
                  goto bail;
            }
      } else {
            /* if the name was not found in new_dir, add it now */
            status = ocfs2_add_entry(handle, new_dentry, old_inode,
                               OCFS2_I(old_inode)->ip_blkno,
                               new_dir_bh, insert_entry_bh);
      }

      old_inode->i_ctime = CURRENT_TIME;
      mark_inode_dirty(old_inode);

      status = ocfs2_journal_access(handle, old_inode, old_inode_bh,
                              OCFS2_JOURNAL_ACCESS_WRITE);
      if (status >= 0) {
            old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;

            old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
            old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);

            status = ocfs2_journal_dirty(handle, old_inode_bh);
            if (status < 0)
                  mlog_errno(status);
      } else
            mlog_errno(status);

      /*
       * Now that the name has been added to new_dir, remove the old name.
       *
       * We don't keep any directory entry context around until now
       * because the insert might have changed the type of directory
       * we're dealing with.
       */
      old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
                             old_dentry->d_name.len,
                             old_dir, &old_de);
      if (!old_de_bh) {
            status = -EIO;
            goto bail;
      }

      status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      if (new_inode) {
            new_inode->i_nlink--;
            new_inode->i_ctime = CURRENT_TIME;
      }
      old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
      if (old_inode_de_bh) {
            status = ocfs2_update_entry(old_inode, handle, old_inode_de_bh,
                                  old_inode_dot_dot_de, new_dir);
            old_dir->i_nlink--;
            if (new_inode) {
                  new_inode->i_nlink--;
            } else {
                  inc_nlink(new_dir);
                  mark_inode_dirty(new_dir);
            }
      }
      mark_inode_dirty(old_dir);
      ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
      if (new_inode) {
            mark_inode_dirty(new_inode);
            ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
      }

      if (old_dir != new_dir) {
            /* Keep the same times on both directories.*/
            new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;

            /*
             * This will also pick up the i_nlink change from the
             * block above.
             */
            ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
      }

      if (old_dir_nlink != old_dir->i_nlink) {
            if (!old_dir_bh) {
                  mlog(ML_ERROR, "need to change nlink for old dir "
                       "%llu from %d to %d but bh is NULL!\n",
                       (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
                       (int)old_dir_nlink, old_dir->i_nlink);
            } else {
                  struct ocfs2_dinode *fe;
                  status = ocfs2_journal_access(handle, old_dir,
                                          old_dir_bh,
                                          OCFS2_JOURNAL_ACCESS_WRITE);
                  fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
                  fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
                  status = ocfs2_journal_dirty(handle, old_dir_bh);
            }
      }

      ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
      status = 0;
bail:
      if (rename_lock)
            ocfs2_rename_unlock(osb);

      if (handle)
            ocfs2_commit_trans(osb, handle);

      if (parents_locked)
            ocfs2_double_unlock(old_dir, new_dir);

      if (old_child_locked)
            ocfs2_meta_unlock(old_inode, 1);

      if (new_child_locked)
            ocfs2_meta_unlock(new_inode, 1);

      if (orphan_dir) {
            /* This was locked for us in ocfs2_prepare_orphan_dir() */
            ocfs2_meta_unlock(orphan_dir, 1);
            mutex_unlock(&orphan_dir->i_mutex);
            iput(orphan_dir);
      }

      if (new_inode)
            sync_mapping_buffers(old_inode->i_mapping);

      if (new_inode)
            iput(new_inode);
      if (newfe_bh)
            brelse(newfe_bh);
      if (old_inode_bh)
            brelse(old_inode_bh);
      if (old_dir_bh)
            brelse(old_dir_bh);
      if (new_dir_bh)
            brelse(new_dir_bh);
      if (new_de_bh)
            brelse(new_de_bh);
      if (old_de_bh)
            brelse(old_de_bh);
      if (old_inode_de_bh)
            brelse(old_inode_de_bh);
      if (orphan_entry_bh)
            brelse(orphan_entry_bh);
      if (insert_entry_bh)
            brelse(insert_entry_bh);

      mlog_exit(status);

      return status;
}

/*
 * we expect i_size = strlen(symname). Copy symname into the file
 * data, including the null terminator.
 */
static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
                             handle_t *handle,
                             struct inode *inode,
                             const char *symname)
{
      struct buffer_head **bhs = NULL;
      const char *c;
      struct super_block *sb = osb->sb;
      u64 p_blkno, p_blocks;
      int virtual, blocks, status, i, bytes_left;

      bytes_left = i_size_read(inode) + 1;
      /* we can't trust i_blocks because we're actually going to
       * write i_size + 1 bytes. */
      blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;

      mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
                  (unsigned long long)inode->i_blocks,
                  i_size_read(inode), blocks);

      /* Sanity check -- make sure we're going to fit. */
      if (bytes_left >
          ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
            status = -EIO;
            mlog_errno(status);
            goto bail;
      }

      bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
      if (!bhs) {
            status = -ENOMEM;
            mlog_errno(status);
            goto bail;
      }

      status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
                                   NULL);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      /* links can never be larger than one cluster so we know this
       * is all going to be contiguous, but do a sanity check
       * anyway. */
      if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
            status = -EIO;
            mlog_errno(status);
            goto bail;
      }

      virtual = 0;
      while(bytes_left > 0) {
            c = &symname[virtual * sb->s_blocksize];

            bhs[virtual] = sb_getblk(sb, p_blkno);
            if (!bhs[virtual]) {
                  status = -ENOMEM;
                  mlog_errno(status);
                  goto bail;
            }
            ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);

            status = ocfs2_journal_access(handle, inode, bhs[virtual],
                                    OCFS2_JOURNAL_ACCESS_CREATE);
            if (status < 0) {
                  mlog_errno(status);
                  goto bail;
            }

            memset(bhs[virtual]->b_data, 0, sb->s_blocksize);

            memcpy(bhs[virtual]->b_data, c,
                   (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
                   bytes_left);

            status = ocfs2_journal_dirty(handle, bhs[virtual]);
            if (status < 0) {
                  mlog_errno(status);
                  goto bail;
            }

            virtual++;
            p_blkno++;
            bytes_left -= sb->s_blocksize;
      }

      status = 0;
bail:

      if (bhs) {
            for(i = 0; i < blocks; i++)
                  if (bhs[i])
                        brelse(bhs[i]);
            kfree(bhs);
      }

      mlog_exit(status);
      return status;
}

static int ocfs2_symlink(struct inode *dir,
                   struct dentry *dentry,
                   const char *symname)
{
      int status, l, credits;
      u64 newsize;
      struct ocfs2_super *osb = NULL;
      struct inode *inode = NULL;
      struct super_block *sb;
      struct buffer_head *new_fe_bh = NULL;
      struct buffer_head *de_bh = NULL;
      struct buffer_head *parent_fe_bh = NULL;
      struct ocfs2_dinode *fe = NULL;
      struct ocfs2_dinode *dirfe;
      handle_t *handle = NULL;
      struct ocfs2_alloc_context *inode_ac = NULL;
      struct ocfs2_alloc_context *data_ac = NULL;

      mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
               dentry, symname, dentry->d_name.len, dentry->d_name.name);

      sb = dir->i_sb;
      osb = OCFS2_SB(sb);

      l = strlen(symname) + 1;

      credits = ocfs2_calc_symlink_credits(sb);

      /* lock the parent directory */
      status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
      if (status < 0) {
            if (status != -ENOENT)
                  mlog_errno(status);
            return status;
      }

      dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
      if (!dirfe->i_links_count) {
            /* can't make a file in a deleted directory. */
            status = -ENOENT;
            goto bail;
      }

      status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
                                 dentry->d_name.len);
      if (status)
            goto bail;

      status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
                                    dentry->d_name.name,
                                    dentry->d_name.len, &de_bh);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      status = ocfs2_reserve_new_inode(osb, &inode_ac);
      if (status < 0) {
            if (status != -ENOSPC)
                  mlog_errno(status);
            goto bail;
      }

      /* don't reserve bitmap space for fast symlinks. */
      if (l > ocfs2_fast_symlink_chars(sb)) {
            status = ocfs2_reserve_clusters(osb, 1, &data_ac);
            if (status < 0) {
                  if (status != -ENOSPC)
                        mlog_errno(status);
                  goto bail;
            }
      }

      handle = ocfs2_start_trans(osb, credits);
      if (IS_ERR(handle)) {
            status = PTR_ERR(handle);
            handle = NULL;
            mlog_errno(status);
            goto bail;
      }

      status = ocfs2_mknod_locked(osb, dir, dentry,
                            S_IFLNK | S_IRWXUGO, 0,
                            &new_fe_bh, parent_fe_bh, handle,
                            &inode, inode_ac);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
      inode->i_rdev = 0;
      newsize = l - 1;
      if (l > ocfs2_fast_symlink_chars(sb)) {
            u32 offset = 0;

            inode->i_op = &ocfs2_symlink_inode_operations;
            status = ocfs2_do_extend_allocation(osb, inode, &offset, 1, 0,
                                        new_fe_bh,
                                        handle, data_ac, NULL,
                                        NULL);
            if (status < 0) {
                  if (status != -ENOSPC && status != -EINTR) {
                        mlog(ML_ERROR,
                             "Failed to extend file to %llu\n",
                             (unsigned long long)newsize);
                        mlog_errno(status);
                        status = -ENOSPC;
                  }
                  goto bail;
            }
            i_size_write(inode, newsize);
            inode->i_blocks = ocfs2_inode_sector_count(inode);
      } else {
            inode->i_op = &ocfs2_fast_symlink_inode_operations;
            memcpy((char *) fe->id2.i_symlink, symname, l);
            i_size_write(inode, newsize);
            inode->i_blocks = 0;
      }

      status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      if (!ocfs2_inode_is_fast_symlink(inode)) {
            status = ocfs2_create_symlink_data(osb, handle, inode,
                                       symname);
            if (status < 0) {
                  mlog_errno(status);
                  goto bail;
            }
      }

      status = ocfs2_add_entry(handle, dentry, inode,
                         le64_to_cpu(fe->i_blkno), parent_fe_bh,
                         de_bh);
      if (status < 0) {
            mlog_errno(status);
            goto bail;
      }

      status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
      if (status) {
            mlog_errno(status);
            goto bail;
      }

      insert_inode_hash(inode);
      dentry->d_op = &ocfs2_dentry_ops;
      d_instantiate(dentry, inode);
bail:
      if (handle)
            ocfs2_commit_trans(osb, handle);

      ocfs2_meta_unlock(dir, 1);

      if (new_fe_bh)
            brelse(new_fe_bh);
      if (parent_fe_bh)
            brelse(parent_fe_bh);
      if (de_bh)
            brelse(de_bh);
      if (inode_ac)
            ocfs2_free_alloc_context(inode_ac);
      if (data_ac)
            ocfs2_free_alloc_context(data_ac);
      if ((status < 0) && inode)
            iput(inode);

      mlog_exit(status);

      return status;
}

static int ocfs2_blkno_stringify(u64 blkno, char *name)
{
      int status, namelen;

      mlog_entry_void();

      namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
                     (long long)blkno);
      if (namelen <= 0) {
            if (namelen)
                  status = namelen;
            else
                  status = -EINVAL;
            mlog_errno(status);
            goto bail;
      }
      if (namelen != OCFS2_ORPHAN_NAMELEN) {
            status = -EINVAL;
            mlog_errno(status);
            goto bail;
      }

      mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
           namelen);

      status = 0;
bail:
      mlog_exit(status);
      return status;
}

static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
                            struct inode **ret_orphan_dir,
                            struct inode *inode,
                            char *name,
                            struct buffer_head **de_bh)
{
      struct inode *orphan_dir_inode;
      struct buffer_head *orphan_dir_bh = NULL;
      int status = 0;

      status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
      if (status < 0) {
            mlog_errno(status);
            return status;
      }

      orphan_dir_inode = ocfs2_get_system_file_inode(osb,
                                           ORPHAN_DIR_SYSTEM_INODE,
                                           osb->slot_num);
      if (!orphan_dir_inode) {
            status = -ENOENT;
            mlog_errno(status);
            return status;
      }

      mutex_lock(&orphan_dir_inode->i_mutex);

      status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
                                    orphan_dir_bh, name,
                                    OCFS2_ORPHAN_NAMELEN, de_bh);
      if (status < 0) {
            ocfs2_meta_unlock(orphan_dir_inode, 1);

            mlog_errno(status);
            goto leave;
      }

      *ret_orphan_dir = orphan_dir_inode;

leave:
      if (status) {
            mutex_unlock(&orphan_dir_inode->i_mutex);
            iput(orphan_dir_inode);
      }

      if (orphan_dir_bh)
            brelse(orphan_dir_bh);

      mlog_exit(status);
      return status;
}

static int ocfs2_orphan_add(struct ocfs2_super *osb,
                      handle_t *handle,
                      struct inode *inode,
                      struct ocfs2_dinode *fe,
                      char *name,
                      struct buffer_head *de_bh,
                      struct inode *orphan_dir_inode)
{
      struct buffer_head *orphan_dir_bh = NULL;
      int status = 0;
      struct ocfs2_dinode *orphan_fe;

      mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);

      status = ocfs2_read_block(osb,
                          OCFS2_I(orphan_dir_inode)->ip_blkno,
                          &orphan_dir_bh, OCFS2_BH_CACHED,
                          orphan_dir_inode);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
                              OCFS2_JOURNAL_ACCESS_WRITE);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      /* we're a cluster, and nlink can change on disk from
       * underneath us... */
      orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
      if (S_ISDIR(inode->i_mode))
            le16_add_cpu(&orphan_fe->i_links_count, 1);
      orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);

      status = ocfs2_journal_dirty(handle, orphan_dir_bh);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
                           OCFS2_ORPHAN_NAMELEN, inode,
                           OCFS2_I(inode)->ip_blkno,
                           orphan_dir_bh, de_bh);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);

      /* Record which orphan dir our inode now resides
       * in. delete_inode will use this to determine which orphan
       * dir to lock. */
      fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);

      mlog(0, "Inode %llu orphaned in slot %d\n",
           (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);

leave:
      if (orphan_dir_bh)
            brelse(orphan_dir_bh);

      mlog_exit(status);
      return status;
}

/* unlike orphan_add, we expect the orphan dir to already be locked here. */
int ocfs2_orphan_del(struct ocfs2_super *osb,
                 handle_t *handle,
                 struct inode *orphan_dir_inode,
                 struct inode *inode,
                 struct buffer_head *orphan_dir_bh)
{
      char name[OCFS2_ORPHAN_NAMELEN + 1];
      struct ocfs2_dinode *orphan_fe;
      int status = 0;
      struct buffer_head *target_de_bh = NULL;
      struct ocfs2_dir_entry *target_de = NULL;

      mlog_entry_void();

      status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
           name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
           OCFS2_ORPHAN_NAMELEN);

      /* find it's spot in the orphan directory */
      target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
                              orphan_dir_inode, &target_de);
      if (!target_de_bh) {
            status = -ENOENT;
            mlog_errno(status);
            goto leave;
      }

      /* remove it from the orphan directory */
      status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
                            target_de_bh);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      status = ocfs2_journal_access(handle,orphan_dir_inode,  orphan_dir_bh,
                              OCFS2_JOURNAL_ACCESS_WRITE);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

      /* do the i_nlink dance! :) */
      orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
      if (S_ISDIR(inode->i_mode))
            le16_add_cpu(&orphan_fe->i_links_count, -1);
      orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);

      status = ocfs2_journal_dirty(handle, orphan_dir_bh);
      if (status < 0) {
            mlog_errno(status);
            goto leave;
      }

leave:
      if (target_de_bh)
            brelse(target_de_bh);

      mlog_exit(status);
      return status;
}

const struct inode_operations ocfs2_dir_iops = {
      .create           = ocfs2_create,
      .lookup           = ocfs2_lookup,
      .link       = ocfs2_link,
      .unlink           = ocfs2_unlink,
      .rmdir            = ocfs2_unlink,
      .symlink    = ocfs2_symlink,
      .mkdir            = ocfs2_mkdir,
      .mknod            = ocfs2_mknod,
      .rename           = ocfs2_rename,
      .setattr    = ocfs2_setattr,
      .getattr    = ocfs2_getattr,
      .permission = ocfs2_permission,
};

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