namei.c

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/* -*- 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 ([email protected])
 *  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>
#include <linux/quotaops.h>

#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 "xattr.h"
#include "acl.h"
#include "ocfs2_trace.h"

#include "buffer_head_io.h"

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

static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
                    struct inode **ret_orphan_dir,
                    u64 blkno,
                    char *name,
                    struct ocfs2_dir_lookup_result *lookup);

static int ocfs2_orphan_add(struct ocfs2_super *osb,
                handle_t *handle,
                struct inode *inode,
                struct buffer_head *fe_bh,
                char *name,
                struct ocfs2_dir_lookup_result *lookup,
                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,
                   unsigned int flags)
{
    int status;
    u64 blkno;
    struct inode *inode = NULL;
    struct dentry *ret;
    struct ocfs2_inode_info *oi;

    trace_ocfs2_lookup(dir, dentry, dentry->d_name.len,
               dentry->d_name.name,
               (unsigned long long)OCFS2_I(dir)->ip_blkno, 0);

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

    status = ocfs2_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT);
    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, 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:
    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;
        }
    } else
        ocfs2_dentry_attach_gen(dentry);

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 downconvert thread and have a stale dentry. */
    ocfs2_inode_unlock(dir, 0);

bail:

    trace_ocfs2_lookup_ret(ret);

    return ret;
}

static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t mode)
{
    struct inode *inode;

    inode = new_inode(dir->i_sb);
    if (!inode) {
        mlog(ML_ERROR, "new_inode failed!\n");
        return NULL;
    }

    /* populate as many fields early on as possible - many of
     * these are used by the support functions here and in
     * callers. */
    if (S_ISDIR(mode))
        set_nlink(inode, 2);
    inode_init_owner(inode, dir, mode);
    dquot_initialize(inode);
    return inode;
}

static int ocfs2_mknod(struct inode *dir,
               struct dentry *dentry,
               umode_t 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 inode *inode = NULL;
    struct ocfs2_alloc_context *inode_ac = NULL;
    struct ocfs2_alloc_context *data_ac = NULL;
    struct ocfs2_alloc_context *meta_ac = NULL;
    int want_clusters = 0;
    int want_meta = 0;
    int xattr_credits = 0;
    struct ocfs2_security_xattr_info si = {
        .enable = 1,
    };
    int did_quota_inode = 0;
    struct ocfs2_dir_lookup_result lookup = { NULL, };
    sigset_t oldset;
    int did_block_signals = 0;

    trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name,
              (unsigned long long)OCFS2_I(dir)->ip_blkno,
              (unsigned long)dev, mode);

    dquot_initialize(dir);

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

    status = ocfs2_inode_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(osb))) {
        status = -EMLINK;
        goto leave;
    }

    dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
    if (!ocfs2_read_links_count(dirfe)) {
        /* 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, &lookup);
    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;
    }

    inode = ocfs2_get_init_inode(dir, mode);
    if (!inode) {
        status = -ENOMEM;
        mlog_errno(status);
        goto leave;
    }

    /* get security xattr */
    status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
    if (status) {
        if (status == -EOPNOTSUPP)
            si.enable = 0;
        else {
            mlog_errno(status);
            goto leave;
        }
    }

    /* calculate meta data/clusters for setting security and acl xattr */
    status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
                       &si, &want_clusters,
                       &xattr_credits, &want_meta);
    if (status < 0) {
        mlog_errno(status);
        goto leave;
    }

    /* Reserve a cluster if creating an extent based directory. */
    if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
        want_clusters += 1;

        /* Dir indexing requires extra space as well */
        if (ocfs2_supports_indexed_dirs(osb))
            want_meta++;
    }

    status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
    if (status < 0) {
        if (status != -ENOSPC)
            mlog_errno(status);
        goto leave;
    }

    status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
    if (status < 0) {
        if (status != -ENOSPC)
            mlog_errno(status);
        goto leave;
    }

    handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
                                S_ISDIR(mode),
                                xattr_credits));
    if (IS_ERR(handle)) {
        status = PTR_ERR(handle);
        handle = NULL;
        mlog_errno(status);
        goto leave;
    }

    /* Starting to change things, restart is no longer possible. */
    ocfs2_block_signals(&oldset);
    did_block_signals = 1;

    status = dquot_alloc_inode(inode);
    if (status)
        goto leave;
    did_quota_inode = 1;

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

        status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
                         parent_fe_bh,
                         OCFS2_JOURNAL_ACCESS_WRITE);
        if (status < 0) {
            mlog_errno(status);
            goto leave;
        }
        ocfs2_add_links_count(dirfe, 1);
        ocfs2_journal_dirty(handle, parent_fe_bh);
        inc_nlink(dir);
    }

    status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
                meta_ac, data_ac);
    if (status < 0) {
        mlog_errno(status);
        goto leave;
    }

    if (si.enable) {
        status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
                         meta_ac, data_ac);
        if (status < 0) {
            mlog_errno(status);
            goto leave;
        }
    }

    /*
     * Do this before adding the entry to the directory. We add
     * also set d_op after success so that ->d_iput() will cleanup
     * the dentry lock even if ocfs2_add_entry() fails below.
     */
    status = ocfs2_dentry_attach_lock(dentry, inode,
                      OCFS2_I(dir)->ip_blkno);
    if (status) {
        mlog_errno(status);
        goto leave;
    }

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

    insert_inode_hash(inode);
    d_instantiate(dentry, inode);
    status = 0;
leave:
    if (status < 0 && did_quota_inode)
        dquot_free_inode(inode);
    if (handle)
        ocfs2_commit_trans(osb, handle);

    ocfs2_inode_unlock(dir, 1);
    if (did_block_signals)
        ocfs2_unblock_signals(&oldset);

    brelse(new_fe_bh);
    brelse(parent_fe_bh);
    kfree(si.name);
    kfree(si.value);

    ocfs2_free_dir_lookup_result(&lookup);

    if (inode_ac)
        ocfs2_free_alloc_context(inode_ac);

    if (data_ac)
        ocfs2_free_alloc_context(data_ac);

    if (meta_ac)
        ocfs2_free_alloc_context(meta_ac);

    /*
     * We should call iput after the i_mutex of the bitmap been
     * unlocked in ocfs2_free_alloc_context, or the
     * ocfs2_delete_inode will mutex_lock again.
     */
    if ((status < 0) && inode) {
        OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
        clear_nlink(inode);
        iput(inode);
    }

    if (status)
        mlog_errno(status);

    return status;
}

static int __ocfs2_mknod_locked(struct inode *dir,
                struct inode *inode,
                dev_t dev,
                struct buffer_head **new_fe_bh,
                struct buffer_head *parent_fe_bh,
                handle_t *handle,
                struct ocfs2_alloc_context *inode_ac,
                u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
{
    int status = 0;
    struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
    struct ocfs2_dinode *fe = NULL;
    struct ocfs2_extent_list *fel;
    u16 feat;

    *new_fe_bh = NULL;

    /* 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;
    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_CACHE(inode), *new_fe_bh);

    status = ocfs2_journal_access_di(handle, INODE_CACHE(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_loc = cpu_to_le64(suballoc_loc);
    fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
    fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
    fe->i_uid = cpu_to_le32(inode->i_uid);
    fe->i_gid = cpu_to_le32(inode->i_gid);
    fe->i_mode = cpu_to_le16(inode->i_mode);
    if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
        fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));

    ocfs2_set_links_count(fe, 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 inline
     * isn't supported, but indexing is, we start them as indexed.
     */
    feat = le16_to_cpu(fe->i_dyn_features);
    if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
        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_with_xattr(osb->sb, fe));
    } 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));
    }

    ocfs2_journal_dirty(handle, *new_fe_bh);

    ocfs2_populate_inode(inode, fe, 1);
    ocfs2_ci_set_new(osb, INODE_CACHE(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 */

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

    if (status)
        mlog_errno(status);
    return status;
}

static int ocfs2_mknod_locked(struct ocfs2_super *osb,
                  struct inode *dir,
                  struct inode *inode,
                  dev_t dev,
                  struct buffer_head **new_fe_bh,
                  struct buffer_head *parent_fe_bh,
                  handle_t *handle,
                  struct ocfs2_alloc_context *inode_ac)
{
    int status = 0;
    u64 suballoc_loc, fe_blkno = 0;
    u16 suballoc_bit;

    *new_fe_bh = NULL;

    status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
                       inode_ac, &suballoc_loc,
                       &suballoc_bit, &fe_blkno);
    if (status < 0) {
        mlog_errno(status);
        return status;
    }

    return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
                    parent_fe_bh, handle, inode_ac,
                    fe_blkno, suballoc_loc, suballoc_bit);
}

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

    trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
              OCFS2_I(dir)->ip_blkno, mode);
    ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
    if (ret)
        mlog_errno(ret);

    return ret;
}

static int ocfs2_create(struct inode *dir,
            struct dentry *dentry,
            umode_t mode,
            bool excl)
{
    int ret;

    trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
               (unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
    ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
    if (ret)
        mlog_errno(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 ocfs2_dinode *fe = NULL;
    struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
    struct ocfs2_dir_lookup_result lookup = { NULL, };
    sigset_t oldset;

    trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
             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;

    dquot_initialize(dir);

    err = ocfs2_inode_lock_nested(dir, &parent_fe_bh, 1, OI_LS_PARENT);
    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, &lookup);
    if (err < 0) {
        mlog_errno(err);
        goto out;
    }

    err = ocfs2_inode_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 (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
        err = -EMLINK;
        goto out_unlock_inode;
    }

    handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
    if (IS_ERR(handle)) {
        err = PTR_ERR(handle);
        handle = NULL;
        mlog_errno(err);
        goto out_unlock_inode;
    }

    /* Starting to change things, restart is no longer possible. */
    ocfs2_block_signals(&oldset);

    err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
                      OCFS2_JOURNAL_ACCESS_WRITE);
    if (err < 0) {
        mlog_errno(err);
        goto out_commit;
    }

    inc_nlink(inode);
    inode->i_ctime = CURRENT_TIME;
    ocfs2_set_links_count(fe, 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);
    ocfs2_journal_dirty(handle, fe_bh);

    err = ocfs2_add_entry(handle, dentry, inode,
                  OCFS2_I(inode)->ip_blkno,
                  parent_fe_bh, &lookup);
    if (err) {
        ocfs2_add_links_count(fe, -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;
    }

    ihold(inode);
    d_instantiate(dentry, inode);

out_commit:
    ocfs2_commit_trans(osb, handle);
    ocfs2_unblock_signals(&oldset);
out_unlock_inode:
    ocfs2_inode_unlock(inode, 1);

out:
    ocfs2_inode_unlock(dir, 1);

    brelse(fe_bh);
    brelse(parent_fe_bh);

    ocfs2_free_dir_lookup_result(&lookup);

    if (err)
        mlog_errno(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;
    char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
    struct ocfs2_dir_lookup_result lookup = { NULL, };
    struct ocfs2_dir_lookup_result orphan_insert = { NULL, };

    trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
               dentry->d_name.name,
               (unsigned long long)OCFS2_I(dir)->ip_blkno,
               (unsigned long long)OCFS2_I(inode)->ip_blkno);

    dquot_initialize(dir);

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

    if (inode == osb->root_inode)
        return -EPERM;

    status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
                     OI_LS_PARENT);
    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,
                      &lookup);
    if (status < 0) {
        if (status != -ENOENT)
            mlog_errno(status);
        goto leave;
    }

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

        trace_ocfs2_unlink_noent(
                (unsigned long long)OCFS2_I(inode)->ip_blkno,
                (unsigned long long)blkno,
                OCFS2_I(inode)->ip_flags);
        goto leave;
    }

    status = ocfs2_inode_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 (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
            status = -ENOTEMPTY;
            goto leave;
        }
    }

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

    if (inode_is_unlinkable(inode)) {
        status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
                          OCFS2_I(inode)->ip_blkno,
                          orphan_name, &orphan_insert);
        if (status < 0) {
            mlog_errno(status);
            goto leave;
        }
    }

    handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
    if (IS_ERR(handle)) {
        status = PTR_ERR(handle);
        handle = NULL;
        mlog_errno(status);
        goto leave;
    }

    status = ocfs2_journal_access_di(handle, INODE_CACHE(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_bh, orphan_name,
                      &orphan_insert, orphan_dir);
        if (status < 0) {
            mlog_errno(status);
            goto leave;
        }
    }

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

    if (S_ISDIR(inode->i_mode))
        drop_nlink(inode);
    drop_nlink(inode);
    ocfs2_set_links_count(fe, inode->i_nlink);
    ocfs2_journal_dirty(handle, fe_bh);

    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_inode_unlock(inode, 1);

    ocfs2_inode_unlock(dir, 1);

    if (orphan_dir) {
        /* This was locked for us in ocfs2_prepare_orphan_dir() */
        ocfs2_inode_unlock(orphan_dir, 1);
        mutex_unlock(&orphan_dir->i_mutex);
        iput(orphan_dir);
    }

    brelse(fe_bh);
    brelse(parent_node_bh);

    ocfs2_free_dir_lookup_result(&orphan_insert);
    ocfs2_free_dir_lookup_result(&lookup);

    if (status)
        mlog_errno(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;

    trace_ocfs2_double_lock((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 */
            tmpbh = bh2;
            bh2 = bh1;
            bh1 = tmpbh;

            tmpinode = inode2;
            inode2 = inode1;
            inode1 = tmpinode;
        }
        /* lock id2 */
        status = ocfs2_inode_lock_nested(inode2, bh2, 1,
                         OI_LS_RENAME1);
        if (status < 0) {
            if (status != -ENOENT)
                mlog_errno(status);
            goto bail;
        }
    }

    /* lock id1 */
    status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2);
    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_inode_unlock(inode2, 1);
            brelse(*bh2);
            *bh2 = NULL;
        }

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

    trace_ocfs2_double_lock_end(
            (unsigned long long)OCFS2_I(inode1)->ip_blkno,
            (unsigned long long)OCFS2_I(inode2)->ip_blkno);

bail:
    if (status)
        mlog_errno(status);
    return status;
}

static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
{
    ocfs2_inode_unlock(inode1, 1);

    if (inode1 != inode2)
        ocfs2_inode_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, target_exists = 0;
    int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 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 *newfe_bh = NULL;
    struct buffer_head *old_inode_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;
    u32 old_dir_nlink = old_dir->i_nlink;
    struct ocfs2_dinode *old_di;
    struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
    struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
    struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
    struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
    struct ocfs2_dir_lookup_result target_insert = { NULL, };

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

    trace_ocfs2_rename(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);

    dquot_initialize(old_dir);
    dquot_initialize(new_dir);

    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_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
        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 downconvert thread on other nodes
     * won't have to concurrently downconvert the inode and the
     * dentry locks.
     */
    status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
                     OI_LS_PARENT);
    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;

        update_dot_dot = 1;
        status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
                          old_inode,
                          &old_inode_dot_dot_res);
        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(osb)) {
            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,
                      &target_lookup_res);
    /* 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 (status == 0)
        target_exists = 1;

    if (!target_exists && 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 (target_exists) {
        /* 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;

            trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
                        new_dentry->d_name.name);
            goto bail;
        }

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

            trace_ocfs2_rename_disagree(
                 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
                 (unsigned long long)newfe_blkno,
                 OCFS2_I(new_inode)->ip_flags);
            goto bail;
        }

        status = ocfs2_inode_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;

        trace_ocfs2_rename_over_existing(
             (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,
                        OCFS2_I(new_inode)->ip_blkno,
                        orphan_name, &orphan_insert);
            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,
                              &target_insert);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }
    }

    handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
    if (IS_ERR(handle)) {
        status = PTR_ERR(handle);
        handle = NULL;
        mlog_errno(status);
        goto bail;
    }

    if (target_exists) {
        if (S_ISDIR(new_inode->i_mode)) {
            if (new_inode->i_nlink != 2 ||
                !ocfs2_empty_dir(new_inode)) {
                status = -ENOTEMPTY;
                goto bail;
            }
        }
        status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
                         newfe_bh,
                         OCFS2_JOURNAL_ACCESS_WRITE);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }

        if (S_ISDIR(new_inode->i_mode) ||
            (ocfs2_read_links_count(newfe) == 1)) {
            status = ocfs2_orphan_add(osb, handle, new_inode,
                          newfe_bh, orphan_name,
                          &orphan_insert, 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, &target_lookup_res,
                        old_inode);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }
        new_dir->i_version++;

        if (S_ISDIR(new_inode->i_mode))
            ocfs2_set_links_count(newfe, 0);
        else
            ocfs2_add_links_count(newfe, -1);
        ocfs2_journal_dirty(handle, newfe_bh);
    } 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, &target_insert);
    }

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

    status = ocfs2_journal_access_di(handle, INODE_CACHE(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);
        ocfs2_journal_dirty(handle, old_inode_bh);
    } 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.
     */
    status = ocfs2_find_entry(old_dentry->d_name.name,
                  old_dentry->d_name.len, old_dir,
                  &old_entry_lookup);
    if (status)
        goto bail;

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

    if (new_inode) {
        drop_nlink(new_inode);
        new_inode->i_ctime = CURRENT_TIME;
    }
    old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;

    if (update_dot_dot) {
        status = ocfs2_update_entry(old_inode, handle,
                        &old_inode_dot_dot_res, new_dir);
        drop_nlink(old_dir);
        if (new_inode) {
            drop_nlink(new_inode);
        } 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_di(handle,
                             INODE_CACHE(old_dir),
                             old_dir_bh,
                             OCFS2_JOURNAL_ACCESS_WRITE);
            fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
            ocfs2_set_links_count(fe, old_dir->i_nlink);
            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_inode_unlock(old_inode, 1);

    if (new_child_locked)
        ocfs2_inode_unlock(new_inode, 1);

    if (orphan_dir) {
        /* This was locked for us in ocfs2_prepare_orphan_dir() */
        ocfs2_inode_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);

    ocfs2_free_dir_lookup_result(&target_lookup_res);
    ocfs2_free_dir_lookup_result(&old_entry_lookup);
    ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
    ocfs2_free_dir_lookup_result(&orphan_insert);
    ocfs2_free_dir_lookup_result(&target_insert);

    brelse(newfe_bh);
    brelse(old_inode_bh);
    brelse(old_dir_bh);
    brelse(new_dir_bh);

    if (status)
        mlog_errno(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;

    trace_ocfs2_create_symlink_data((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_CACHE(inode),
                          bhs[virtual]);

        status = ocfs2_journal_access(handle, INODE_CACHE(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);

        ocfs2_journal_dirty(handle, bhs[virtual]);

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

    status = 0;
bail:

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

    if (status)
        mlog_errno(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 *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;
    struct ocfs2_alloc_context *xattr_ac = NULL;
    int want_clusters = 0;
    int xattr_credits = 0;
    struct ocfs2_security_xattr_info si = {
        .enable = 1,
    };
    int did_quota = 0, did_quota_inode = 0;
    struct ocfs2_dir_lookup_result lookup = { NULL, };
    sigset_t oldset;
    int did_block_signals = 0;

    trace_ocfs2_symlink_begin(dir, dentry, symname,
                  dentry->d_name.len, dentry->d_name.name);

    dquot_initialize(dir);

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

    l = strlen(symname) + 1;

    credits = ocfs2_calc_symlink_credits(sb);

    /* lock the parent directory */
    status = ocfs2_inode_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 (!ocfs2_read_links_count(dirfe)) {
        /* 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, &lookup);
    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;
    }

    inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
    if (!inode) {
        status = -ENOMEM;
        mlog_errno(status);
        goto bail;
    }

    /* get security xattr */
    status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
    if (status) {
        if (status == -EOPNOTSUPP)
            si.enable = 0;
        else {
            mlog_errno(status);
            goto bail;
        }
    }

    /* calculate meta data/clusters for setting security xattr */
    if (si.enable) {
        status = ocfs2_calc_security_init(dir, &si, &want_clusters,
                          &xattr_credits, &xattr_ac);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }
    }

    /* don't reserve bitmap space for fast symlinks. */
    if (l > ocfs2_fast_symlink_chars(sb))
        want_clusters += 1;

    status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
    if (status < 0) {
        if (status != -ENOSPC)
            mlog_errno(status);
        goto bail;
    }

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

    /* Starting to change things, restart is no longer possible. */
    ocfs2_block_signals(&oldset);
    did_block_signals = 1;

    status = dquot_alloc_inode(inode);
    if (status)
        goto bail;
    did_quota_inode = 1;

    trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
                   dentry->d_name.name,
                   (unsigned long long)OCFS2_I(dir)->ip_blkno,
                   inode->i_mode);

    status = ocfs2_mknod_locked(osb, dir, inode,
                    0, &new_fe_bh, parent_fe_bh, handle,
                    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;
    inode->i_op = &ocfs2_symlink_inode_operations;
    if (l > ocfs2_fast_symlink_chars(sb)) {
        u32 offset = 0;

        status = dquot_alloc_space_nodirty(inode,
            ocfs2_clusters_to_bytes(osb->sb, 1));
        if (status)
            goto bail;
        did_quota = 1;
        inode->i_mapping->a_ops = &ocfs2_aops;
        status = ocfs2_add_inode_data(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_mapping->a_ops = &ocfs2_fast_symlink_aops;
        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;
        }
    }

    if (si.enable) {
        status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
                         xattr_ac, data_ac);
        if (status < 0) {
            mlog_errno(status);
            goto bail;
        }
    }

    /*
     * Do this before adding the entry to the directory. We add
     * also set d_op after success so that ->d_iput() will cleanup
     * the dentry lock even if ocfs2_add_entry() fails below.
     */
    status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
    if (status) {
        mlog_errno(status);
        goto bail;
    }

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

    insert_inode_hash(inode);
    d_instantiate(dentry, inode);
bail:
    if (status < 0 && did_quota)
        dquot_free_space_nodirty(inode,
                    ocfs2_clusters_to_bytes(osb->sb, 1));
    if (status < 0 && did_quota_inode)
        dquot_free_inode(inode);
    if (handle)
        ocfs2_commit_trans(osb, handle);

    ocfs2_inode_unlock(dir, 1);
    if (did_block_signals)
        ocfs2_unblock_signals(&oldset);

    brelse(new_fe_bh);
    brelse(parent_fe_bh);
    kfree(si.name);
    kfree(si.value);
    ocfs2_free_dir_lookup_result(&lookup);
    if (inode_ac)
        ocfs2_free_alloc_context(inode_ac);
    if (data_ac)
        ocfs2_free_alloc_context(data_ac);
    if (xattr_ac)
        ocfs2_free_alloc_context(xattr_ac);
    if ((status < 0) && inode) {
        OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
        clear_nlink(inode);
        iput(inode);
    }

    if (status)
        mlog_errno(status);

    return status;
}

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

    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;
    }

    trace_ocfs2_blkno_stringify(blkno, name, namelen);

    status = 0;
bail:
    if (status < 0)
        mlog_errno(status);
    return status;
}

static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
                    struct inode **ret_orphan_dir,
                    struct buffer_head **ret_orphan_dir_bh)
{
    struct inode *orphan_dir_inode;
    struct buffer_head *orphan_dir_bh = NULL;
    int ret = 0;

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

    mutex_lock(&orphan_dir_inode->i_mutex);

    ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
    if (ret < 0) {
        mutex_unlock(&orphan_dir_inode->i_mutex);
        iput(orphan_dir_inode);

        mlog_errno(ret);
        return ret;
    }

    *ret_orphan_dir = orphan_dir_inode;
    *ret_orphan_dir_bh = orphan_dir_bh;

    return 0;
}

static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
                      struct buffer_head *orphan_dir_bh,
                      u64 blkno,
                      char *name,
                      struct ocfs2_dir_lookup_result *lookup)
{
    int ret;
    struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);

    ret = ocfs2_blkno_stringify(blkno, name);
    if (ret < 0) {
        mlog_errno(ret);
        return ret;
    }

    ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
                       orphan_dir_bh, name,
                       OCFS2_ORPHAN_NAMELEN, lookup);
    if (ret < 0) {
        mlog_errno(ret);
        return ret;
    }

    return 0;
}

static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
                    struct inode **ret_orphan_dir,
                    u64 blkno,
                    char *name,
                    struct ocfs2_dir_lookup_result *lookup)
{
    struct inode *orphan_dir_inode = NULL;
    struct buffer_head *orphan_dir_bh = NULL;
    int ret = 0;

    ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
                       &orphan_dir_bh);
    if (ret < 0) {
        mlog_errno(ret);
        return ret;
    }

    ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
                     blkno, name, lookup);
    if (ret < 0) {
        mlog_errno(ret);
        goto out;
    }

    *ret_orphan_dir = orphan_dir_inode;

out:
    brelse(orphan_dir_bh);

    if (ret) {
        ocfs2_inode_unlock(orphan_dir_inode, 1);
        mutex_unlock(&orphan_dir_inode->i_mutex);
        iput(orphan_dir_inode);
    }

    if (ret)
        mlog_errno(ret);
    return ret;
}

static int ocfs2_orphan_add(struct ocfs2_super *osb,
                handle_t *handle,
                struct inode *inode,
                struct buffer_head *fe_bh,
                char *name,
                struct ocfs2_dir_lookup_result *lookup,
                struct inode *orphan_dir_inode)
{
    struct buffer_head *orphan_dir_bh = NULL;
    int status = 0;
    struct ocfs2_dinode *orphan_fe;
    struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;

    trace_ocfs2_orphan_add_begin(
                (unsigned long long)OCFS2_I(inode)->ip_blkno);

    status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
    if (status < 0) {
        mlog_errno(status);
        goto leave;
    }

    status = ocfs2_journal_access_di(handle,
                     INODE_CACHE(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))
        ocfs2_add_links_count(orphan_fe, 1);
    set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
    ocfs2_journal_dirty(handle, orphan_dir_bh);

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

    /*
     * We're going to journal the change of i_flags and i_orphaned_slot.
     * It's safe anyway, though some callers may duplicate the journaling.
     * Journaling within the func just make the logic look more
     * straightforward.
     */
    status = ocfs2_journal_access_di(handle,
                     INODE_CACHE(inode),
                     fe_bh,
                     OCFS2_JOURNAL_ACCESS_WRITE);
    if (status < 0) {
        mlog_errno(status);
        goto leave;
    }

    le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
    OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;

    /* 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);

    ocfs2_journal_dirty(handle, fe_bh);

    trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
                   osb->slot_num);

leave:
    brelse(orphan_dir_bh);

    if (status)
        mlog_errno(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 ocfs2_dir_lookup_result lookup = { NULL, };

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

    trace_ocfs2_orphan_del(
         (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
         name, OCFS2_ORPHAN_NAMELEN);

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

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

    status = ocfs2_journal_access_di(handle,
                     INODE_CACHE(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))
        ocfs2_add_links_count(orphan_fe, -1);
    set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
    ocfs2_journal_dirty(handle, orphan_dir_bh);

leave:
    ocfs2_free_dir_lookup_result(&lookup);

    if (status)
        mlog_errno(status);
    return status;
}

static int ocfs2_prep_new_orphaned_file(struct inode *dir,
                    struct buffer_head *dir_bh,
                    char *orphan_name,
                    struct inode **ret_orphan_dir,
                    u64 *ret_di_blkno,
                    struct ocfs2_dir_lookup_result *orphan_insert,
                    struct ocfs2_alloc_context **ret_inode_ac)
{
    int ret;
    u64 di_blkno;
    struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
    struct inode *orphan_dir = NULL;
    struct buffer_head *orphan_dir_bh = NULL;
    struct ocfs2_alloc_context *inode_ac = NULL;

    ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
    if (ret < 0) {
        mlog_errno(ret);
        return ret;
    }

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

    ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
                       &di_blkno);
    if (ret) {
        mlog_errno(ret);
        goto out;
    }

    ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
                     di_blkno, orphan_name, orphan_insert);
    if (ret < 0) {
        mlog_errno(ret);
        goto out;
    }

out:
    if (ret == 0) {
        *ret_orphan_dir = orphan_dir;
        *ret_di_blkno = di_blkno;
        *ret_inode_ac = inode_ac;
        /*
         * orphan_name and orphan_insert are already up to
         * date via prepare_orphan_dir
         */
    } else {
        /* Unroll reserve_new_inode* */
        if (inode_ac)
            ocfs2_free_alloc_context(inode_ac);

        /* Unroll orphan dir locking */
        mutex_unlock(&orphan_dir->i_mutex);
        ocfs2_inode_unlock(orphan_dir, 1);
        iput(orphan_dir);
    }

    brelse(orphan_dir_bh);

    return 0;
}

int ocfs2_create_inode_in_orphan(struct inode *dir,
                 int mode,
                 struct inode **new_inode)
{
    int status, did_quota_inode = 0;
    struct inode *inode = NULL;
    struct inode *orphan_dir = NULL;
    struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
    struct ocfs2_dinode *di = NULL;
    handle_t *handle = NULL;
    char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
    struct buffer_head *parent_di_bh = NULL;
    struct buffer_head *new_di_bh = NULL;
    struct ocfs2_alloc_context *inode_ac = NULL;
    struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
    u64 uninitialized_var(di_blkno), suballoc_loc;
    u16 suballoc_bit;

    status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
    if (status < 0) {
        if (status != -ENOENT)
            mlog_errno(status);
        return status;
    }

    status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
                          orphan_name, &orphan_dir,
                          &di_blkno, &orphan_insert, &inode_ac);
    if (status < 0) {
        if (status != -ENOSPC)
            mlog_errno(status);
        goto leave;
    }

    inode = ocfs2_get_init_inode(dir, mode);
    if (!inode) {
        status = -ENOMEM;
        mlog_errno(status);
        goto leave;
    }

    handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
    if (IS_ERR(handle)) {
        status = PTR_ERR(handle);
        handle = NULL;
        mlog_errno(status);
        goto leave;
    }

    status = dquot_alloc_inode(inode);
    if (status)
        goto leave;
    did_quota_inode = 1;

    status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
                          &suballoc_loc,
                          &suballoc_bit, di_blkno);
    if (status < 0) {
        mlog_errno(status);
        goto leave;
    }

    clear_nlink(inode);
    /* do the real work now. */
    status = __ocfs2_mknod_locked(dir, inode,
                      0, &new_di_bh, parent_di_bh, handle,
                      inode_ac, di_blkno, suballoc_loc,
                      suballoc_bit);
    if (status < 0) {
        mlog_errno(status);
        goto leave;
    }

    di = (struct ocfs2_dinode *)new_di_bh->b_data;
    status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
                  &orphan_insert, orphan_dir);
    if (status < 0) {
        mlog_errno(status);
        goto leave;
    }

    /* get open lock so that only nodes can't remove it from orphan dir. */
    status = ocfs2_open_lock(inode);
    if (status < 0)
        mlog_errno(status);

    insert_inode_hash(inode);
leave:
    if (status < 0 && did_quota_inode)
        dquot_free_inode(inode);
    if (handle)
        ocfs2_commit_trans(osb, handle);

    if (orphan_dir) {
        /* This was locked for us in ocfs2_prepare_orphan_dir() */
        ocfs2_inode_unlock(orphan_dir, 1);
        mutex_unlock(&orphan_dir->i_mutex);
        iput(orphan_dir);
    }

    if ((status < 0) && inode) {
        clear_nlink(inode);
        iput(inode);
    }

    if (inode_ac)
        ocfs2_free_alloc_context(inode_ac);

    brelse(new_di_bh);

    if (!status)
        *new_inode = inode;

    ocfs2_free_dir_lookup_result(&orphan_insert);

    ocfs2_inode_unlock(dir, 1);
    brelse(parent_di_bh);
    return status;
}

int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
                   struct inode *inode,
                   struct dentry *dentry)
{
    int status = 0;
    struct buffer_head *parent_di_bh = NULL;
    handle_t *handle = NULL;
    struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
    struct ocfs2_dinode *dir_di, *di;
    struct inode *orphan_dir_inode = NULL;
    struct buffer_head *orphan_dir_bh = NULL;
    struct buffer_head *di_bh = NULL;
    struct ocfs2_dir_lookup_result lookup = { NULL, };

    trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
                dentry->d_name.len, dentry->d_name.name,
                (unsigned long long)OCFS2_I(dir)->ip_blkno,
                (unsigned long long)OCFS2_I(inode)->ip_blkno);

    status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
    if (status < 0) {
        if (status != -ENOENT)
            mlog_errno(status);
        return status;
    }

    dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
    if (!dir_di->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_di_bh,
                          dentry->d_name.name,
                          dentry->d_name.len, &lookup);
    if (status < 0) {
        mlog_errno(status);
        goto leave;
    }

    orphan_dir_inode = ocfs2_get_system_file_inode(osb,
                               ORPHAN_DIR_SYSTEM_INODE,
                               osb->slot_num);
    if (!orphan_dir_inode) {
        status = -EEXIST;
        mlog_errno(status);
        goto leave;
    }

    mutex_lock(&orphan_dir_inode->i_mutex);

    status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
    if (status < 0) {
        mlog_errno(status);
        mutex_unlock(&orphan_dir_inode->i_mutex);
        iput(orphan_dir_inode);
        goto leave;
    }

    status = ocfs2_read_inode_block(inode, &di_bh);
    if (status < 0) {
        mlog_errno(status);
        goto orphan_unlock;
    }

    handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
    if (IS_ERR(handle)) {
        status = PTR_ERR(handle);
        handle = NULL;
        mlog_errno(status);
        goto orphan_unlock;
    }

    status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
                     di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
    if (status < 0) {
        mlog_errno(status);
        goto out_commit;
    }

    status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
                  orphan_dir_bh);
    if (status < 0) {
        mlog_errno(status);
        goto out_commit;
    }

    di = (struct ocfs2_dinode *)di_bh->b_data;
    le32_add_cpu(&di->i_flags, -OCFS2_ORPHANED_FL);
    di->i_orphaned_slot = 0;
    set_nlink(inode, 1);
    ocfs2_set_links_count(di, inode->i_nlink);
    ocfs2_journal_dirty(handle, di_bh);

    status = ocfs2_add_entry(handle, dentry, inode,
                 OCFS2_I(inode)->ip_blkno, parent_di_bh,
                 &lookup);
    if (status < 0) {
        mlog_errno(status);
        goto out_commit;
    }

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

    d_instantiate(dentry, inode);
    status = 0;
out_commit:
    ocfs2_commit_trans(osb, handle);
orphan_unlock:
    ocfs2_inode_unlock(orphan_dir_inode, 1);
    mutex_unlock(&orphan_dir_inode->i_mutex);
    iput(orphan_dir_inode);
leave:

    ocfs2_inode_unlock(dir, 1);

    brelse(di_bh);
    brelse(parent_di_bh);
    brelse(orphan_dir_bh);

    ocfs2_free_dir_lookup_result(&lookup);

    if (status)
        mlog_errno(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,
    .setxattr   = generic_setxattr,
    .getxattr   = generic_getxattr,
    .listxattr  = ocfs2_listxattr,
    .removexattr    = generic_removexattr,
    .fiemap         = ocfs2_fiemap,
    .get_acl    = ocfs2_iop_get_acl,
};