// SPDX-License-Identifier: GPL-2.0-or-later
/* -*- 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
 */

#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/quotaops.h>
#include <linux/iversion.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,
                                    bool dio);

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,
                            bool dio);

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

static int ocfs2_double_lock(struct ocfs2_super *osb,
                             struct buffer_head **bh1,
                             struct inode *inode1,
                             struct buffer_head **bh2,
                             struct inode *inode2,
                             int rename);

static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2);
/* 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 (!IS_ERR_OR_NULL(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;
        int status;

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

        /* 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);
        status = dquot_initialize(inode);
        if (status)
                return ERR_PTR(status);

        return inode;
}

static void ocfs2_cleanup_add_entry_failure(struct ocfs2_super *osb,
                struct dentry *dentry, struct inode *inode)
{
        struct ocfs2_dentry_lock *dl = dentry->d_fsdata;

        ocfs2_simple_drop_lockres(osb, &dl->dl_lockres);
        ocfs2_lock_res_free(&dl->dl_lockres);
        BUG_ON(dl->dl_count != 1);
        spin_lock(&dentry_attach_lock);
        dentry->d_fsdata = NULL;
        spin_unlock(&dentry_attach_lock);
        kfree(dl);
        iput(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;
        struct ocfs2_dentry_lock *dl = NULL;

        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);

        status = dquot_initialize(dir);
        if (status) {
                mlog_errno(status);
                return status;
        }

        /* 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 (IS_ERR(inode)) {
                status = PTR_ERR(inode);
                inode = NULL;
                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 roll_back;
        }

        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 roll_back;
                }
        }

        /*
         * 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 roll_back;
        }

        dl = dentry->d_fsdata;

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

        insert_inode_hash(inode);
        d_instantiate(dentry, inode);
        status = 0;

roll_back:
        if (status < 0 && S_ISDIR(mode)) {
                ocfs2_add_links_count(dirfe, -1);
                drop_nlink(dir);
        }

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.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) {
                if (dl)
                        ocfs2_cleanup_add_entry_failure(osb, dentry, 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;
        struct ocfs2_inode_info *oi = OCFS2_I(inode);
        struct timespec64 ts;

        *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);
        oi->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 = -ENOMEM;
                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(i_uid_read(inode));
        fe->i_gid = cpu_to_le32(i_gid_read(inode));
        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);
        fe->i_flags |= cpu_to_le32(OCFS2_VALID_FL);
        ktime_get_real_ts64(&ts);
        fe->i_atime = fe->i_ctime = fe->i_mtime =
                cpu_to_le64(ts.tv_sec);
        fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
                cpu_to_le32(ts.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);
        }

        ocfs2_update_inode_fsync_trans(handle, inode, 1);

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;
        }

        status = __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
                                    parent_fe_bh, handle, inode_ac,
                                    fe_blkno, suballoc_loc, suballoc_bit);
        if (status < 0) {
                u64 bg_blkno = ocfs2_which_suballoc_group(fe_blkno, suballoc_bit);
                int tmp = ocfs2_free_suballoc_bits(handle, inode_ac->ac_inode,
                                inode_ac->ac_bh, suballoc_bit, bg_blkno, 1);
                if (tmp)
                        mlog_errno(tmp);
        }

        return status;
}

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 = d_inode(old_dentry);
        struct inode *old_dir = d_inode(old_dentry->d_parent);
        int err;
        struct buffer_head *fe_bh = NULL;
        struct buffer_head *old_dir_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;
        u64 old_de_ino;

        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;

        err = dquot_initialize(dir);
        if (err) {
                mlog_errno(err);
                return err;
        }

        err = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
                        &parent_fe_bh, dir, 0);
        if (err < 0) {
                if (err != -ENOENT)
                        mlog_errno(err);
                return err;
        }

        /* make sure both dirs have bhs
         * get an extra ref on old_dir_bh if old==new */
        if (!parent_fe_bh) {
                if (old_dir_bh) {
                        parent_fe_bh = old_dir_bh;
                        get_bh(parent_fe_bh);
                } else {
                        mlog(ML_ERROR, "%s: no old_dir_bh!\n", osb->uuid_str);
                        err = -EIO;
                        goto out;
                }
        }

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

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

        /*
         * Check whether another node removed the source inode while we
         * were in the vfs.
         */
        if (old_de_ino != OCFS2_I(inode)->ip_blkno) {
                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(inode);
        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_double_unlock(old_dir, dir);

        brelse(fe_bh);
        brelse(parent_fe_bh);
        brelse(old_dir_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 ocfs2_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;
        bool is_unlinkable = false;
        struct inode *inode = d_inode(dentry);
        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);

        status = dquot_initialize(dir);
        if (status) {
                mlog_errno(status);
                return status;
        }

        BUG_ON(d_inode(dentry->d_parent) != 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 (ocfs2_inode_is_unlinkable(inode)) {
                status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
                                                  OCFS2_I(inode)->ip_blkno,
                                                  orphan_name, &orphan_insert,
                                                  false);
                if (status < 0) {
                        mlog_errno(status);
                        goto leave;
                }
                is_unlinkable = true;
        }

        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;

        /* 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(dir);
        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);
                goto leave;
        }

        if (is_unlinkable) {
                status = ocfs2_orphan_add(osb, handle, inode, fe_bh,
                                orphan_name, &orphan_insert, orphan_dir, false);
                if (status < 0)
                        mlog_errno(status);
        }

leave:
        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);
                inode_unlock(orphan_dir);
                iput(orphan_dir);
        }

        if (child_locked)
                ocfs2_inode_unlock(inode, 1);

        ocfs2_inode_unlock(dir, 1);

        brelse(fe_bh);
        brelse(parent_node_bh);

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

        if (status && (status != -ENOTEMPTY) && (status != -ENOENT))
                mlog_errno(status);

        return status;
}

static int ocfs2_check_if_ancestor(struct ocfs2_super *osb,
                u64 src_inode_no, u64 dest_inode_no)
{
        int ret = 0, i = 0;
        u64 parent_inode_no = 0;
        u64 child_inode_no = src_inode_no;
        struct inode *child_inode;

#define MAX_LOOKUP_TIMES 32
        while (1) {
                child_inode = ocfs2_iget(osb, child_inode_no, 0, 0);
                if (IS_ERR(child_inode)) {
                        ret = PTR_ERR(child_inode);
                        break;
                }

                ret = ocfs2_inode_lock(child_inode, NULL, 0);
                if (ret < 0) {
                        iput(child_inode);
                        if (ret != -ENOENT)
                                mlog_errno(ret);
                        break;
                }

                ret = ocfs2_lookup_ino_from_name(child_inode, "..", 2,
                                &parent_inode_no);
                ocfs2_inode_unlock(child_inode, 0);
                iput(child_inode);
                if (ret < 0) {
                        ret = -ENOENT;
                        break;
                }

                if (parent_inode_no == dest_inode_no) {
                        ret = 1;
                        break;
                }

                if (parent_inode_no == osb->root_inode->i_ino) {
                        ret = 0;
                        break;
                }

                child_inode_no = parent_inode_no;

                if (++i >= MAX_LOOKUP_TIMES) {
                        mlog(ML_NOTICE, "max lookup times reached, filesystem "
                                        "may have nested directories, "
                                        "src inode: %llu, dest inode: %llu.\n",
                                        (unsigned long long)src_inode_no,
                                        (unsigned long long)dest_inode_no);
                        ret = 0;
                        break;
                }
        }

        return ret;
}

/*
 * The only place this should be used is rename and link!
 * 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 rename)
{
        int status;
        int inode1_is_ancestor, inode2_is_ancestor;
        struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
        struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);

        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.
         * and if they are nested, we lock ancestor first */
        if (oi1->ip_blkno != oi2->ip_blkno) {
                inode1_is_ancestor = ocfs2_check_if_ancestor(osb, oi2->ip_blkno,
                                oi1->ip_blkno);
                if (inode1_is_ancestor < 0) {
                        status = inode1_is_ancestor;
                        goto bail;
                }

                inode2_is_ancestor = ocfs2_check_if_ancestor(osb, oi1->ip_blkno,
                                oi2->ip_blkno);
                if (inode2_is_ancestor < 0) {
                        status = inode2_is_ancestor;
                        goto bail;
                }

                if ((inode1_is_ancestor == 1) ||
                                (oi1->ip_blkno < oi2->ip_blkno &&
                                inode2_is_ancestor == 0)) {
                        /* switch id1 and id2 around */
                        swap(bh2, bh1);
                        swap(inode2, inode1);
                }
                /* lock id2 */
                status = ocfs2_inode_lock_nested(inode2, bh2, 1,
                                rename == 1 ? OI_LS_RENAME1 : OI_LS_PARENT);
                if (status < 0) {
                        if (status != -ENOENT)
                                mlog_errno(status);
                        goto bail;
                }
        }

        /* lock id1 */
        status = ocfs2_inode_lock_nested(inode1, bh1, 1,
                        rename == 1 ?  OI_LS_RENAME2 : OI_LS_PARENT);
        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)oi1->ip_blkno,
                        (unsigned long long)oi2->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,
                        unsigned int flags)
{
        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 = d_inode(old_dentry);
        struct inode *new_inode = d_inode(new_dentry);
        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, };
        bool should_add_orphan = false;

        if (flags)
                return -EINVAL;

        /* 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);

        status = dquot_initialize(old_dir);
        if (status) {
                mlog_errno(status);
                goto bail;
        }
        status = dquot_initialize(new_dir);
        if (status) {
                mlog_errno(status);
                goto bail;
        }

        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;

                /* here we cannot guarantee the inodes haven't just been
                 * changed, so check if they are nested again */
                status = ocfs2_check_if_ancestor(osb, new_dir->i_ino,
                                old_inode->i_ino);
                if (status < 0) {
                        mlog_errno(status);
                        goto bail;
                } else if (status == 1) {
                        status = -EPERM;
                        trace_ocfs2_rename_not_permitted(
                                        (unsigned long long)old_inode->i_ino,
                                        (unsigned long long)new_dir->i_ino);
                        goto bail;
                }
        }

        /* 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, 1);
        if (status < 0) {
                mlog_errno(status);
                goto bail;
        }
        parents_locked = 1;

        if (!new_dir->i_nlink) {
                status = -EACCES;
                goto bail;
        }

        /* 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,
                                                false);
                        if (status < 0) {
                                mlog_errno(status);
                                goto bail;
                        }
                        should_add_orphan = true;
                }
        } else {
                BUG_ON(d_inode(new_dentry->d_parent) != 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;
                }

                /* 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;
                }
                inode_inc_iversion(new_dir);

                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);
                if (should_add_orphan) {
                        status = ocfs2_orphan_add(osb, handle, new_inode,
                                        newfe_bh, orphan_name,
                                        &orphan_insert, orphan_dir, false);
                        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, &target_insert);
        }

        old_inode->i_ctime = current_time(old_inode);
        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) {
                if (!is_journal_aborted(osb->journal->j_journal)) {
                        ocfs2_error(osb->sb, "new entry %.*s is added, but old entry %.*s "
                                        "is not deleted.",
                                        new_dentry->d_name.len, new_dentry->d_name.name,
                                        old_dentry->d_name.len, old_dentry->d_name.name);
                }
                goto bail;
        }

        status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
        if (status < 0) {
                mlog_errno(status);
                if (!is_journal_aborted(osb->journal->j_journal)) {
                        ocfs2_error(osb->sb, "new entry %.*s is added, but old entry %.*s "
                                        "is not deleted.",
                                        new_dentry->d_name.len, new_dentry->d_name.name,
                                        old_dentry->d_name.len, old_dentry->d_name.name);
                }
                goto bail;
        }

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

        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 (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);
                inode_unlock(orphan_dir);
                iput(orphan_dir);
        }

        if (new_child_locked)
                ocfs2_inode_unlock(new_inode, 1);

        if (old_child_locked)
                ocfs2_inode_unlock(old_inode, 1);

        if (parents_locked)
                ocfs2_double_unlock(old_dir, new_dir);

        if (rename_lock)
                ocfs2_rename_unlock(osb);

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

        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;
        struct ocfs2_dentry_lock *dl = NULL;

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

        status = dquot_initialize(dir);
        if (status) {
                mlog_errno(status);
                goto bail;
        }

        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 (IS_ERR(inode)) {
                status = PTR_ERR(inode);
                inode = NULL;
                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;
        inode_nohighmem(inode);
        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;
        }

        dl = dentry->d_fsdata;

        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.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) {
                if (dl)
                        ocfs2_cleanup_add_entry_failure(osb, dentry, 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;
        }

        inode_lock(orphan_dir_inode);

        ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
        if (ret < 0) {
                inode_unlock(orphan_dir_inode);
                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,
                                      bool dio)
{
        int ret;
        struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
        int namelen = dio ?
                        (OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN) :
                        OCFS2_ORPHAN_NAMELEN;

        if (dio) {
                ret = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
                                OCFS2_DIO_ORPHAN_PREFIX);
                if (ret != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
                        ret = -EINVAL;
                        mlog_errno(ret);
                        return ret;
                }

                ret = ocfs2_blkno_stringify(blkno,
                                name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
        } else
                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,
                                           namelen, lookup);
        if (ret < 0) {
                mlog_errno(ret);
                return ret;
        }

        return 0;
}

/**
 * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
 * insertion of an orphan.
 * @osb: ocfs2 file system
 * @ret_orphan_dir: Orphan dir inode - returned locked!
 * @blkno: Actual block number of the inode to be inserted into orphan dir.
 * @lookup: dir lookup result, to be passed back into functions like
 *          ocfs2_orphan_add
 *
 * Returns zero on success and the ret_orphan_dir, name and lookup
 * fields will be populated.
 *
 * Returns non-zero on failure. 
 */
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,
                                    bool dio)
{
        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, dio);
        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);
                inode_unlock(orphan_dir_inode);
                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,
                            bool dio)
{
        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;
        int namelen = dio ?
                        (OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN) :
                        OCFS2_ORPHAN_NAMELEN;

        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 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;
        }

        /* 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,
                                   namelen, inode,
                                   OCFS2_I(inode)->ip_blkno,
                                   orphan_dir_bh, lookup);
        if (status < 0) {
                mlog_errno(status);
                goto rollback;
        }

        if (dio) {
                /* Update flag OCFS2_DIO_ORPHANED_FL and record the orphan
                 * slot.
                 */
                fe->i_flags |= cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
                fe->i_dio_orphaned_slot = cpu_to_le16(osb->slot_num);
        } else {
                fe->i_flags |= cpu_to_le32(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);

rollback:
        if (status < 0) {
                if (S_ISDIR(inode->i_mode))
                        ocfs2_add_links_count(orphan_fe, -1);
                set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
        }

leave:
        brelse(orphan_dir_bh);

        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,
                     bool dio)
{
        char name[OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN + 1];
        struct ocfs2_dinode *orphan_fe;
        int status = 0;
        struct ocfs2_dir_lookup_result lookup = { NULL, };

        if (dio) {
                status = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
                                OCFS2_DIO_ORPHAN_PREFIX);
                if (status != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
                        status = -EINVAL;
                        mlog_errno(status);
                        return status;
                }

                status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno,
                                name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
        } else
                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, strlen(name));

        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;
        }

        /* find it's spot in the orphan directory */
        status = ocfs2_find_entry(name, strlen(name), 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;
        }

        /* 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;
}

/**
 * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
 * allocated file. This is different from the typical 'add to orphan dir'
 * operation in that the inode does not yet exist. This is a problem because
 * the orphan dir stringifies the inode block number to come up with it's
 * dirent. Obviously if the inode does not yet exist we have a chicken and egg
 * problem. This function works around it by calling deeper into the orphan
 * and suballoc code than other callers. Use this only by necessity.
 * @dir: The directory which this inode will ultimately wind up under - not the
 * orphan dir!
 * @dir_bh: buffer_head the @dir inode block
 * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
 * with the string to be used for orphan dirent. Pass back to the orphan dir
 * code.
 * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
 * dir code.
 * @ret_di_blkno: block number where the new inode will be allocated.
 * @orphan_insert: Dir insert context to be passed back into orphan dir code.
 * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
 *
 * Returns zero on success and the ret_orphan_dir, name and lookup
 * fields will be populated.
 *
 * Returns non-zero on failure. 
 */
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,
                                         false);
        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 */
                inode_unlock(orphan_dir);
                ocfs2_inode_unlock(orphan_dir, 1);
                iput(orphan_dir);
        }

        brelse(orphan_dir_bh);

        return ret;
}

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);
        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 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 (IS_ERR(inode)) {
                status = PTR_ERR(inode);
                inode = NULL;
                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;
        }

        status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
                                  &orphan_insert, orphan_dir, false);
        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);
                inode_unlock(orphan_dir);
                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_add_inode_to_orphan(struct ocfs2_super *osb,
        struct inode *inode)
{
        char orphan_name[OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN + 1];
        struct inode *orphan_dir_inode = NULL;
        struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
        struct buffer_head *di_bh = NULL;
        int status = 0;
        handle_t *handle = NULL;
        struct ocfs2_dinode *di = NULL;

        status = ocfs2_inode_lock(inode, &di_bh, 1);
        if (status < 0) {
                mlog_errno(status);
                goto bail;
        }

        di = (struct ocfs2_dinode *) di_bh->b_data;
        /*
         * Another append dio crashed?
         * If so, manually recover it first.
         */
        if (unlikely(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
                status = ocfs2_truncate_file(inode, di_bh, i_size_read(inode));
                if (status < 0) {
                        if (status != -ENOSPC)
                                mlog_errno(status);
                        goto bail_unlock_inode;
                }

                status = ocfs2_del_inode_from_orphan(osb, inode, di_bh, 0, 0);
                if (status < 0) {
                        mlog_errno(status);
                        goto bail_unlock_inode;
                }
        }

        status = ocfs2_prepare_orphan_dir(osb, &orphan_dir_inode,
                        OCFS2_I(inode)->ip_blkno,
                        orphan_name,
                        &orphan_insert,
                        true);
        if (status < 0) {
                mlog_errno(status);
                goto bail_unlock_inode;
        }

        handle = ocfs2_start_trans(osb,
                        OCFS2_INODE_ADD_TO_ORPHAN_CREDITS);
        if (IS_ERR(handle)) {
                status = PTR_ERR(handle);
                goto bail_unlock_orphan;
        }

        status = ocfs2_orphan_add(osb, handle, inode, di_bh, orphan_name,
                        &orphan_insert, orphan_dir_inode, true);
        if (status)
                mlog_errno(status);

        ocfs2_commit_trans(osb, handle);

bail_unlock_orphan:
        ocfs2_inode_unlock(orphan_dir_inode, 1);
        inode_unlock(orphan_dir_inode);
        iput(orphan_dir_inode);

        ocfs2_free_dir_lookup_result(&orphan_insert);

bail_unlock_inode:
        ocfs2_inode_unlock(inode, 1);
        brelse(di_bh);

bail:
        return status;
}

int ocfs2_del_inode_from_orphan(struct ocfs2_super *osb,
                struct inode *inode, struct buffer_head *di_bh,
                int update_isize, loff_t end)
{
        struct inode *orphan_dir_inode = NULL;
        struct buffer_head *orphan_dir_bh = NULL;
        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
        handle_t *handle = NULL;
        int status = 0;

        orphan_dir_inode = ocfs2_get_system_file_inode(osb,
                        ORPHAN_DIR_SYSTEM_INODE,
                        le16_to_cpu(di->i_dio_orphaned_slot));
        if (!orphan_dir_inode) {
                status = -ENOENT;
                mlog_errno(status);
                goto bail;
        }

        inode_lock(orphan_dir_inode);
        status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
        if (status < 0) {
                inode_unlock(orphan_dir_inode);
                iput(orphan_dir_inode);
                mlog_errno(status);
                goto bail;
        }

        handle = ocfs2_start_trans(osb,
                        OCFS2_INODE_DEL_FROM_ORPHAN_CREDITS);
        if (IS_ERR(handle)) {
                status = PTR_ERR(handle);
                goto bail_unlock_orphan;
        }

        BUG_ON(!(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)));

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

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

        di->i_flags &= ~cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
        di->i_dio_orphaned_slot = 0;

        if (update_isize) {
                status = ocfs2_set_inode_size(handle, inode, di_bh, end);
                if (status)
                        mlog_errno(status);
        } else
                ocfs2_journal_dirty(handle, di_bh);

bail_commit:
        ocfs2_commit_trans(osb, handle);

bail_unlock_orphan:
        ocfs2_inode_unlock(orphan_dir_inode, 1);
        inode_unlock(orphan_dir_inode);
        brelse(orphan_dir_bh);
        iput(orphan_dir_inode);

bail:
        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 = -ENOENT;
                mlog_errno(status);
                goto leave;
        }

        inode_lock(orphan_dir_inode);

        status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
        if (status < 0) {
                mlog_errno(status);
                inode_unlock(orphan_dir_inode);
                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, false);
        if (status < 0) {
                mlog_errno(status);
                goto out_commit;
        }

        di = (struct ocfs2_dinode *)di_bh->b_data;
        di->i_flags &= ~cpu_to_le32(OCFS2_ORPHANED_FL);
        di->i_orphaned_slot = 0;
        set_nlink(inode, 1);
        ocfs2_set_links_count(di, inode->i_nlink);
        ocfs2_update_inode_fsync_trans(handle, inode, 1);
        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);
        inode_unlock(orphan_dir_inode);
        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,
        .listxattr      = ocfs2_listxattr,
        .fiemap         = ocfs2_fiemap,
        .get_acl        = ocfs2_iop_get_acl,
        .set_acl        = ocfs2_iop_set_acl,
};