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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * 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 "ioctl.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);
     mode = mode_strip_sgid(&init_user_ns, dir, mode);
     inode_init_owner(&init_user_ns, 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 user_namespace *mnt_userns,
                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_rwsem 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 user_namespace *mnt_userns,
                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(&init_user_ns, dir, dentry, mode | S_IFDIR, 0);
     if (ret)
         mlog_errno(ret);
 
     return ret;
 }
 
 static int ocfs2_create(struct user_namespace *mnt_userns,
             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(&init_user_ns, 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_ratelimited(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 user_namespace *mnt_userns,
             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 user_namespace *mnt_userns,
              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,
     .fileattr_get   = ocfs2_fileattr_get,
     .fileattr_set   = ocfs2_fileattr_set,
 };