text: /*
   *   Copyright (C) International Business Machines Corp., 2000-2004
   *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   *
   *   This program is free software;  you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by
   *   the Free Software Foundation; either version 2 of the License, or
   *   (at your option) any later version.
   *
   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
   *   the GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License
   *   along with this program;  if not, write to the Free Software
   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  
  #include <linux/fs.h>
  #include <linux/namei.h>
  #include <linux/ctype.h>
  #include <linux/quotaops.h>
  #include <linux/exportfs.h>
  #include "jfs_incore.h"
  #include "jfs_superblock.h"
  #include "jfs_inode.h"
  #include "jfs_dinode.h"
  #include "jfs_dmap.h"
  #include "jfs_unicode.h"
  #include "jfs_metapage.h"
  #include "jfs_xattr.h"
  #include "jfs_acl.h"
  #include "jfs_debug.h"
  
  /*
   * forward references
   */
  const struct dentry_operations jfs_ci_dentry_operations;
  
  static s64 commitZeroLink(tid_t, struct inode *);
  
  /*
   * NAME:	free_ea_wmap(inode)
   *
   * FUNCTION:	free uncommitted extended attributes from working map
   *
   */
  static inline void free_ea_wmap(struct inode *inode)
  {
  	dxd_t *ea = &JFS_IP(inode)->ea;
  
  	if (ea->flag & DXD_EXTENT) {
  		/* free EA pages from cache */
  		invalidate_dxd_metapages(inode, *ea);
  		dbFree(inode, addressDXD(ea), lengthDXD(ea));
  	}
  	ea->flag = 0;
  }
  
  /*
   * NAME:	jfs_create(dip, dentry, mode)
   *
   * FUNCTION:	create a regular file in the parent directory <dip>
   *		with name = <from dentry> and mode = <mode>
   *
   * PARAMETER:	dip	- parent directory vnode
   *		dentry	- dentry of new file
   *		mode	- create mode (rwxrwxrwx).
   *		nd- nd struct
   *
   * RETURN:	Errors from subroutines
   *
   */
  static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode,
  		bool excl)
  {
  	int rc = 0;
  	tid_t tid;		/* transaction id */
  	struct inode *ip = NULL;	/* child directory inode */
  	ino_t ino;
  	struct component_name dname;	/* child directory name */
  	struct btstack btstack;
  	struct inode *iplist[2];
  	struct tblock *tblk;
  
  	jfs_info("jfs_create: dip:0x%p name:%pd", dip, dentry);
  
  	dquot_initialize(dip);
  
  	/*
  	 * search parent directory for entry/freespace
  	 * (dtSearch() returns parent directory page pinned)
  	 */
  	if ((rc = get_UCSname(&dname, dentry)))
  		goto out1;
  
  	/*
  	 * Either iAlloc() or txBegin() may block.  Deadlock can occur if we
  	 * block there while holding dtree page, so we allocate the inode &
  	 * begin the transaction before we search the directory.
  	 */
  	ip = ialloc(dip, mode);
  	if (IS_ERR(ip)) {
  		rc = PTR_ERR(ip);
  		goto out2;
  	}
  
  	tid = txBegin(dip->i_sb, 0);
  
  	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
  	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
  
  	rc = jfs_init_acl(tid, ip, dip);
  	if (rc)
  		goto out3;
  
  	rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
  	if (rc) {
  		txAbort(tid, 0);
  		goto out3;
  	}
  
  	if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
  		jfs_err("jfs_create: dtSearch returned %d", rc);
  		txAbort(tid, 0);
  		goto out3;
  	}
  
  	tblk = tid_to_tblock(tid);
  	tblk->xflag |= COMMIT_CREATE;
  	tblk->ino = ip->i_ino;
  	tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
  
  	iplist[0] = dip;
  	iplist[1] = ip;
  
  	/*
  	 * initialize the child XAD tree root in-line in inode
  	 */
  	xtInitRoot(tid, ip);
  
  	/*
  	 * create entry in parent directory for child directory
  	 * (dtInsert() releases parent directory page)
  	 */
  	ino = ip->i_ino;
  	if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
  		if (rc == -EIO) {
  			jfs_err("jfs_create: dtInsert returned -EIO");
  			txAbort(tid, 1);	/* Marks Filesystem dirty */
  		} else
  			txAbort(tid, 0);	/* Filesystem full */
  		goto out3;
  	}
  
  	ip->i_op = &jfs_file_inode_operations;
  	ip->i_fop = &jfs_file_operations;
  	ip->i_mapping->a_ops = &jfs_aops;
  
  	mark_inode_dirty(ip);
  
  	dip->i_ctime = dip->i_mtime = CURRENT_TIME;
  
  	mark_inode_dirty(dip);
  
  	rc = txCommit(tid, 2, &iplist[0], 0);
  
        out3:
  	txEnd(tid);
  	mutex_unlock(&JFS_IP(ip)->commit_mutex);
  	mutex_unlock(&JFS_IP(dip)->commit_mutex);
  	if (rc) {
  		free_ea_wmap(ip);
  		clear_nlink(ip);
  		unlock_new_inode(ip);
  		iput(ip);
  	} else {
  		unlock_new_inode(ip);
  		d_instantiate(dentry, ip);
  	}
  
        out2:
  	free_UCSname(&dname);
  
        out1:
  
  	jfs_info("jfs_create: rc:%d", rc);
  	return rc;
  }
  
  
  /*
   * NAME:	jfs_mkdir(dip, dentry, mode)
   *
   * FUNCTION:	create a child directory in the parent directory <dip>
   *		with name = <from dentry> and mode = <mode>
   *
   * PARAMETER:	dip	- parent directory vnode
   *		dentry	- dentry of child directory
   *		mode	- create mode (rwxrwxrwx).
   *
   * RETURN:	Errors from subroutines
   *
   * note:
   * EACCESS: user needs search+write permission on the parent directory
   */
  static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
  {
  	int rc = 0;
  	tid_t tid;		/* transaction id */
  	struct inode *ip = NULL;	/* child directory inode */
  	ino_t ino;
  	struct component_name dname;	/* child directory name */
  	struct btstack btstack;
  	struct inode *iplist[2];
  	struct tblock *tblk;
  
  	jfs_info("jfs_mkdir: dip:0x%p name:%pd", dip, dentry);
  
  	dquot_initialize(dip);
  
  	/*
  	 * search parent directory for entry/freespace
  	 * (dtSearch() returns parent directory page pinned)
  	 */
  	if ((rc = get_UCSname(&dname, dentry)))
  		goto out1;
  
  	/*
  	 * Either iAlloc() or txBegin() may block.  Deadlock can occur if we
  	 * block there while holding dtree page, so we allocate the inode &
  	 * begin the transaction before we search the directory.
  	 */
  	ip = ialloc(dip, S_IFDIR | mode);
  	if (IS_ERR(ip)) {
  		rc = PTR_ERR(ip);
  		goto out2;
  	}
  
  	tid = txBegin(dip->i_sb, 0);
  
  	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
  	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
  
  	rc = jfs_init_acl(tid, ip, dip);
  	if (rc)
  		goto out3;
  
  	rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
  	if (rc) {
  		txAbort(tid, 0);
  		goto out3;
  	}
  
  	if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
  		jfs_err("jfs_mkdir: dtSearch returned %d", rc);
  		txAbort(tid, 0);
  		goto out3;
  	}
  
  	tblk = tid_to_tblock(tid);
  	tblk->xflag |= COMMIT_CREATE;
  	tblk->ino = ip->i_ino;
  	tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
  
  	iplist[0] = dip;
  	iplist[1] = ip;
  
  	/*
  	 * initialize the child directory in-line in inode
  	 */
  	dtInitRoot(tid, ip, dip->i_ino);
  
  	/*
  	 * create entry in parent directory for child directory
  	 * (dtInsert() releases parent directory page)
  	 */
  	ino = ip->i_ino;
  	if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
  		if (rc == -EIO) {
  			jfs_err("jfs_mkdir: dtInsert returned -EIO");
  			txAbort(tid, 1);	/* Marks Filesystem dirty */
  		} else
  			txAbort(tid, 0);	/* Filesystem full */
  		goto out3;
  	}
  
  	set_nlink(ip, 2);	/* for '.' */
  	ip->i_op = &jfs_dir_inode_operations;
  	ip->i_fop = &jfs_dir_operations;
  
  	mark_inode_dirty(ip);
  
  	/* update parent directory inode */
  	inc_nlink(dip);		/* for '..' from child directory */
  	dip->i_ctime = dip->i_mtime = CURRENT_TIME;
  	mark_inode_dirty(dip);
  
  	rc = txCommit(tid, 2, &iplist[0], 0);
  
        out3:
  	txEnd(tid);
  	mutex_unlock(&JFS_IP(ip)->commit_mutex);
  	mutex_unlock(&JFS_IP(dip)->commit_mutex);
  	if (rc) {
  		free_ea_wmap(ip);
  		clear_nlink(ip);
  		unlock_new_inode(ip);
  		iput(ip);
  	} else {
  		unlock_new_inode(ip);
  		d_instantiate(dentry, ip);
  	}
  
        out2:
  	free_UCSname(&dname);
  
  
        out1:
  
  	jfs_info("jfs_mkdir: rc:%d", rc);
  	return rc;
  }
  
  /*
   * NAME:	jfs_rmdir(dip, dentry)
   *
   * FUNCTION:	remove a link to child directory
   *
   * PARAMETER:	dip	- parent inode
   *		dentry	- child directory dentry
   *
   * RETURN:	-EINVAL	- if name is . or ..
   *		-EINVAL - if . or .. exist but are invalid.
   *		errors from subroutines
   *
   * note:
   * if other threads have the directory open when the last link
   * is removed, the "." and ".." entries, if present, are removed before
   * rmdir() returns and no new entries may be created in the directory,
   * but the directory is not removed until the last reference to
   * the directory is released (cf.unlink() of regular file).
   */
  static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
  {
  	int rc;
  	tid_t tid;		/* transaction id */
  	struct inode *ip = dentry->d_inode;
  	ino_t ino;
  	struct component_name dname;
  	struct inode *iplist[2];
  	struct tblock *tblk;
  
  	jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry);
  
  	/* Init inode for quota operations. */
  	dquot_initialize(dip);
  	dquot_initialize(ip);
  
  	/* directory must be empty to be removed */
  	if (!dtEmpty(ip)) {
  		rc = -ENOTEMPTY;
  		goto out;
  	}
  
  	if ((rc = get_UCSname(&dname, dentry))) {
  		goto out;
  	}
  
  	tid = txBegin(dip->i_sb, 0);
  
  	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
  	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
  
  	iplist[0] = dip;
  	iplist[1] = ip;
  
  	tblk = tid_to_tblock(tid);
  	tblk->xflag |= COMMIT_DELETE;
  	tblk->u.ip = ip;
  
  	/*
  	 * delete the entry of target directory from parent directory
  	 */
  	ino = ip->i_ino;
  	if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
  		jfs_err("jfs_rmdir: dtDelete returned %d", rc);
  		if (rc == -EIO)
  			txAbort(tid, 1);
  		txEnd(tid);
  		mutex_unlock(&JFS_IP(ip)->commit_mutex);
  		mutex_unlock(&JFS_IP(dip)->commit_mutex);
  
  		goto out2;
  	}
  
  	/* update parent directory's link count corresponding
  	 * to ".." entry of the target directory deleted
  	 */
  	dip->i_ctime = dip->i_mtime = CURRENT_TIME;
  	inode_dec_link_count(dip);
  
  	/*
  	 * OS/2 could have created EA and/or ACL
  	 */
  	/* free EA from both persistent and working map */
  	if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
  		/* free EA pages */
  		txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
  	}
  	JFS_IP(ip)->ea.flag = 0;
  
  	/* free ACL from both persistent and working map */
  	if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
  		/* free ACL pages */
  		txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
  	}
  	JFS_IP(ip)->acl.flag = 0;
  
  	/* mark the target directory as deleted */
  	clear_nlink(ip);
  	mark_inode_dirty(ip);
  
  	rc = txCommit(tid, 2, &iplist[0], 0);
  
  	txEnd(tid);
  
  	mutex_unlock(&JFS_IP(ip)->commit_mutex);
  	mutex_unlock(&JFS_IP(dip)->commit_mutex);
  
  	/*
  	 * Truncating the directory index table is not guaranteed.  It
  	 * may need to be done iteratively
  	 */
  	if (test_cflag(COMMIT_Stale, dip)) {
  		if (dip->i_size > 1)
  			jfs_truncate_nolock(dip, 0);
  
  		clear_cflag(COMMIT_Stale, dip);
  	}
  
        out2:
  	free_UCSname(&dname);
  
        out:
  	jfs_info("jfs_rmdir: rc:%d", rc);
  	return rc;
  }
  
  /*
   * NAME:	jfs_unlink(dip, dentry)
   *
   * FUNCTION:	remove a link to object <vp> named by <name>
   *		from parent directory <dvp>
   *
   * PARAMETER:	dip	- inode of parent directory
   *		dentry	- dentry of object to be removed
   *
   * RETURN:	errors from subroutines
   *
   * note:
   * temporary file: if one or more processes have the file open
   * when the last link is removed, the link will be removed before
   * unlink() returns, but the removal of the file contents will be
   * postponed until all references to the files are closed.
   *
   * JFS does NOT support unlink() on directories.
   *
   */
  static int jfs_unlink(struct inode *dip, struct dentry *dentry)
  {
  	int rc;
  	tid_t tid;		/* transaction id */
  	struct inode *ip = dentry->d_inode;
  	ino_t ino;
  	struct component_name dname;	/* object name */
  	struct inode *iplist[2];
  	struct tblock *tblk;
  	s64 new_size = 0;
  	int commit_flag;
  
  	jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry);
  
  	/* Init inode for quota operations. */
  	dquot_initialize(dip);
  	dquot_initialize(ip);
  
  	if ((rc = get_UCSname(&dname, dentry)))
  		goto out;
  
  	IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
  
  	tid = txBegin(dip->i_sb, 0);
  
  	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
  	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
  
  	iplist[0] = dip;
  	iplist[1] = ip;
  
  	/*
  	 * delete the entry of target file from parent directory
  	 */
  	ino = ip->i_ino;
  	if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
  		jfs_err("jfs_unlink: dtDelete returned %d", rc);
  		if (rc == -EIO)
  			txAbort(tid, 1);	/* Marks FS Dirty */
  		txEnd(tid);
  		mutex_unlock(&JFS_IP(ip)->commit_mutex);
  		mutex_unlock(&JFS_IP(dip)->commit_mutex);
  		IWRITE_UNLOCK(ip);
  		goto out1;
  	}
  
  	ASSERT(ip->i_nlink);
  
  	ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME;
  	mark_inode_dirty(dip);
  
  	/* update target's inode */
  	inode_dec_link_count(ip);
  
  	/*
  	 *	commit zero link count object
  	 */
  	if (ip->i_nlink == 0) {
  		assert(!test_cflag(COMMIT_Nolink, ip));
  		/* free block resources */
  		if ((new_size = commitZeroLink(tid, ip)) < 0) {
  			txAbort(tid, 1);	/* Marks FS Dirty */
  			txEnd(tid);
  			mutex_unlock(&JFS_IP(ip)->commit_mutex);
  			mutex_unlock(&JFS_IP(dip)->commit_mutex);
  			IWRITE_UNLOCK(ip);
  			rc = new_size;
  			goto out1;
  		}
  		tblk = tid_to_tblock(tid);
  		tblk->xflag |= COMMIT_DELETE;
  		tblk->u.ip = ip;
  	}
  
  	/*
  	 * Incomplete truncate of file data can
  	 * result in timing problems unless we synchronously commit the
  	 * transaction.
  	 */
  	if (new_size)
  		commit_flag = COMMIT_SYNC;
  	else
  		commit_flag = 0;
  
  	/*
  	 * If xtTruncate was incomplete, commit synchronously to avoid
  	 * timing complications
  	 */
  	rc = txCommit(tid, 2, &iplist[0], commit_flag);
  
  	txEnd(tid);
  
  	mutex_unlock(&JFS_IP(ip)->commit_mutex);
  	mutex_unlock(&JFS_IP(dip)->commit_mutex);
  
  	while (new_size && (rc == 0)) {
  		tid = txBegin(dip->i_sb, 0);
  		mutex_lock(&JFS_IP(ip)->commit_mutex);
  		new_size = xtTruncate_pmap(tid, ip, new_size);
  		if (new_size < 0) {
  			txAbort(tid, 1);	/* Marks FS Dirty */
  			rc = new_size;
  		} else
  			rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
  		txEnd(tid);
  		mutex_unlock(&JFS_IP(ip)->commit_mutex);
  	}
  
  	if (ip->i_nlink == 0)
  		set_cflag(COMMIT_Nolink, ip);
  
  	IWRITE_UNLOCK(ip);
  
  	/*
  	 * Truncating the directory index table is not guaranteed.  It
  	 * may need to be done iteratively
  	 */
  	if (test_cflag(COMMIT_Stale, dip)) {
  		if (dip->i_size > 1)
  			jfs_truncate_nolock(dip, 0);
  
  		clear_cflag(COMMIT_Stale, dip);
  	}
  
        out1:
  	free_UCSname(&dname);
        out:
  	jfs_info("jfs_unlink: rc:%d", rc);
  	return rc;
  }
  
  /*
   * NAME:	commitZeroLink()
   *
   * FUNCTION:	for non-directory, called by jfs_remove(),
   *		truncate a regular file, directory or symbolic
   *		link to zero length. return 0 if type is not
   *		one of these.
   *
   *		if the file is currently associated with a VM segment
   *		only permanent disk and inode map resources are freed,
   *		and neither the inode nor indirect blocks are modified
   *		so that the resources can be later freed in the work
   *		map by ctrunc1.
   *		if there is no VM segment on entry, the resources are
   *		freed in both work and permanent map.
   *		(? for temporary file - memory object is cached even
   *		after no reference:
   *		reference count > 0 -   )
   *
   * PARAMETERS:	cd	- pointer to commit data structure.
   *			  current inode is the one to truncate.
   *
   * RETURN:	Errors from subroutines
   */
  static s64 commitZeroLink(tid_t tid, struct inode *ip)
  {
  	int filetype;
  	struct tblock *tblk;
  
  	jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
  
  	filetype = ip->i_mode & S_IFMT;
  	switch (filetype) {
  	case S_IFREG:
  		break;
  	case S_IFLNK:
  		/* fast symbolic link */
  		if (ip->i_size < IDATASIZE) {
  			ip->i_size = 0;
  			return 0;
  		}
  		break;
  	default:
  		assert(filetype != S_IFDIR);
  		return 0;
  	}
  
  	set_cflag(COMMIT_Freewmap, ip);
  
  	/* mark transaction of block map update type */
  	tblk = tid_to_tblock(tid);
  	tblk->xflag |= COMMIT_PMAP;
  
  	/*
  	 * free EA
  	 */
  	if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
  		/* acquire maplock on EA to be freed from block map */
  		txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
  
  	/*
  	 * free ACL
  	 */
  	if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
  		/* acquire maplock on EA to be freed from block map */
  		txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
  
  	/*
  	 * free xtree/data (truncate to zero length):
  	 * free xtree/data pages from cache if COMMIT_PWMAP,
  	 * free xtree/data blocks from persistent block map, and
  	 * free xtree/data blocks from working block map if COMMIT_PWMAP;
  	 */
  	if (ip->i_size)
  		return xtTruncate_pmap(tid, ip, 0);
  
  	return 0;
  }
  
  
  /*
   * NAME:	jfs_free_zero_link()
   *
   * FUNCTION:	for non-directory, called by iClose(),
   *		free resources of a file from cache and WORKING map
   *		for a file previously committed with zero link count
   *		while associated with a pager object,
   *
   * PARAMETER:	ip	- pointer to inode of file.
   */
  void jfs_free_zero_link(struct inode *ip)
  {
  	int type;
  
  	jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
  
  	/* return if not reg or symbolic link or if size is
  	 * already ok.
  	 */
  	type = ip->i_mode & S_IFMT;
  
  	switch (type) {
  	case S_IFREG:
  		break;
  	case S_IFLNK:
  		/* if its contained in inode nothing to do */
  		if (ip->i_size < IDATASIZE)
  			return;
  		break;
  	default:
  		return;
  	}
  
  	/*
  	 * free EA
  	 */
  	if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
  		s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
  		int xlen = lengthDXD(&JFS_IP(ip)->ea);
  		struct maplock maplock;	/* maplock for COMMIT_WMAP */
  		struct pxd_lock *pxdlock;	/* maplock for COMMIT_WMAP */
  
  		/* free EA pages from cache */
  		invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
  
  		/* free EA extent from working block map */
  		maplock.index = 1;
  		pxdlock = (struct pxd_lock *) & maplock;
  		pxdlock->flag = mlckFREEPXD;
  		PXDaddress(&pxdlock->pxd, xaddr);
  		PXDlength(&pxdlock->pxd, xlen);
  		txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
  	}
  
  	/*
  	 * free ACL
  	 */
  	if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
  		s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
  		int xlen = lengthDXD(&JFS_IP(ip)->acl);
  		struct maplock maplock;	/* maplock for COMMIT_WMAP */
  		struct pxd_lock *pxdlock;	/* maplock for COMMIT_WMAP */
  
  		invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
  
  		/* free ACL extent from working block map */
  		maplock.index = 1;
  		pxdlock = (struct pxd_lock *) & maplock;
  		pxdlock->flag = mlckFREEPXD;
  		PXDaddress(&pxdlock->pxd, xaddr);
  		PXDlength(&pxdlock->pxd, xlen);
  		txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
  	}
  
  	/*
  	 * free xtree/data (truncate to zero length):
  	 * free xtree/data pages from cache, and
  	 * free xtree/data blocks from working block map;
  	 */
  	if (ip->i_size)
  		xtTruncate(0, ip, 0, COMMIT_WMAP);
  }
  
  /*
   * NAME:	jfs_link(vp, dvp, name, crp)
   *
   * FUNCTION:	create a link to <vp> by the name = <name>
   *		in the parent directory <dvp>
   *
   * PARAMETER:	vp	- target object
   *		dvp	- parent directory of new link
   *		name	- name of new link to target object
   *		crp	- credential
   *
   * RETURN:	Errors from subroutines
   *
   * note:
   * JFS does NOT support link() on directories (to prevent circular
   * path in the directory hierarchy);
   * EPERM: the target object is a directory, and either the caller
   * does not have appropriate privileges or the implementation prohibits
   * using link() on directories [XPG4.2].
   *
   * JFS does NOT support links between file systems:
   * EXDEV: target object and new link are on different file systems and
   * implementation does not support links between file systems [XPG4.2].
   */
  static int jfs_link(struct dentry *old_dentry,
  	     struct inode *dir, struct dentry *dentry)
  {
  	int rc;
  	tid_t tid;
  	struct inode *ip = old_dentry->d_inode;
  	ino_t ino;
  	struct component_name dname;
  	struct btstack btstack;
  	struct inode *iplist[2];
  
  	jfs_info("jfs_link: %pd %pd", old_dentry, dentry);
  
  	dquot_initialize(dir);
  
  	tid = txBegin(ip->i_sb, 0);
  
  	mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
  	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
  
  	/*
  	 * scan parent directory for entry/freespace
  	 */
  	if ((rc = get_UCSname(&dname, dentry)))
  		goto out;
  
  	if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
  		goto free_dname;
  
  	/*
  	 * create entry for new link in parent directory
  	 */
  	ino = ip->i_ino;
  	if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
  		goto free_dname;
  
  	/* update object inode */
  	inc_nlink(ip);		/* for new link */
  	ip->i_ctime = CURRENT_TIME;
  	dir->i_ctime = dir->i_mtime = CURRENT_TIME;
  	mark_inode_dirty(dir);
  	ihold(ip);
  
  	iplist[0] = ip;
  	iplist[1] = dir;
  	rc = txCommit(tid, 2, &iplist[0], 0);
  
  	if (rc) {
  		drop_nlink(ip); /* never instantiated */
  		iput(ip);
  	} else
  		d_instantiate(dentry, ip);
  
        free_dname:
  	free_UCSname(&dname);
  
        out:
  	txEnd(tid);
  
  	mutex_unlock(&JFS_IP(ip)->commit_mutex);
  	mutex_unlock(&JFS_IP(dir)->commit_mutex);
  
  	jfs_info("jfs_link: rc:%d", rc);
  	return rc;
  }
  
  /*
   * NAME:	jfs_symlink(dip, dentry, name)
   *
   * FUNCTION:	creates a symbolic link to <symlink> by name <name>
   *			in directory <dip>
   *
   * PARAMETER:	dip	- parent directory vnode
   *		dentry	- dentry of symbolic link
   *		name	- the path name of the existing object
   *			  that will be the source of the link
   *
   * RETURN:	errors from subroutines
   *
   * note:
   * ENAMETOOLONG: pathname resolution of a symbolic link produced
   * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
  */
  
  static int jfs_symlink(struct inode *dip, struct dentry *dentry,
  		const char *name)
  {
  	int rc;
  	tid_t tid;
  	ino_t ino = 0;
  	struct component_name dname;
  	int ssize;		/* source pathname size */
  	struct btstack btstack;
  	struct inode *ip = dentry->d_inode;
  	unchar *i_fastsymlink;
  	s64 xlen = 0;
  	int bmask = 0, xsize;
  	s64 xaddr;
  	struct metapage *mp;
  	struct super_block *sb;
  	struct tblock *tblk;
  
  	struct inode *iplist[2];
  
  	jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
  
  	dquot_initialize(dip);
  
  	ssize = strlen(name) + 1;
  
  	/*
  	 * search parent directory for entry/freespace
  	 * (dtSearch() returns parent directory page pinned)
  	 */
  
  	if ((rc = get_UCSname(&dname, dentry)))
  		goto out1;
  
  	/*
  	 * allocate on-disk/in-memory inode for symbolic link:
  	 * (iAlloc() returns new, locked inode)
  	 */
  	ip = ialloc(dip, S_IFLNK | 0777);
  	if (IS_ERR(ip)) {
  		rc = PTR_ERR(ip);
  		goto out2;
  	}
  
  	tid = txBegin(dip->i_sb, 0);
  
  	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
  	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
  
  	rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
  	if (rc)
  		goto out3;
  
  	tblk = tid_to_tblock(tid);
  	tblk->xflag |= COMMIT_CREATE;
  	tblk->ino = ip->i_ino;
  	tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
  
  	/* fix symlink access permission
  	 * (dir_create() ANDs in the u.u_cmask,
  	 * but symlinks really need to be 777 access)
  	 */
  	ip->i_mode |= 0777;
  
  	/*
  	 * write symbolic link target path name
  	 */
  	xtInitRoot(tid, ip);
  
  	/*
  	 * write source path name inline in on-disk inode (fast symbolic link)
  	 */
  
  	if (ssize <= IDATASIZE) {
  		ip->i_op = &jfs_fast_symlink_inode_operations;
  
  		i_fastsymlink = JFS_IP(ip)->i_inline;
  		memcpy(i_fastsymlink, name, ssize);
  		ip->i_size = ssize - 1;
  
  		/*
  		 * if symlink is > 128 bytes, we don't have the space to
  		 * store inline extended attributes
  		 */
  		if (ssize > sizeof (JFS_IP(ip)->i_inline))
  			JFS_IP(ip)->mode2 &= ~INLINEEA;
  
  		jfs_info("jfs_symlink: fast symlink added  ssize:%d name:%s ",
  			 ssize, name);
  	}
  	/*
  	 * write source path name in a single extent
  	 */
  	else {
  		jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
  
  		ip->i_op = &jfs_symlink_inode_operations;
  		ip->i_mapping->a_ops = &jfs_aops;
  
  		/*
  		 * even though the data of symlink object (source
  		 * path name) is treated as non-journaled user data,
  		 * it is read/written thru buffer cache for performance.
  		 */
  		sb = ip->i_sb;
  		bmask = JFS_SBI(sb)->bsize - 1;
  		xsize = (ssize + bmask) & ~bmask;
  		xaddr = 0;
  		xlen = xsize >> JFS_SBI(sb)->l2bsize;
  		if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
  			txAbort(tid, 0);
  			goto out3;
  		}
  		ip->i_size = ssize - 1;
  		while (ssize) {
  			/* This is kind of silly since PATH_MAX == 4K */
  			int copy_size = min(ssize, PSIZE);
  
  			mp = get_metapage(ip, xaddr, PSIZE, 1);
  
  			if (mp == NULL) {
  				xtTruncate(tid, ip, 0, COMMIT_PWMAP);
  				rc = -EIO;
  				txAbort(tid, 0);
  				goto out3;
  			}
  			memcpy(mp->data, name, copy_size);
  			flush_metapage(mp);
  			ssize -= copy_size;
  			name += copy_size;
  			xaddr += JFS_SBI(sb)->nbperpage;
  		}
  	}
  
  	/*
  	 * create entry for symbolic link in parent directory
  	 */
  	rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
  	if (rc == 0) {
  		ino = ip->i_ino;
  		rc = dtInsert(tid, dip, &dname, &ino, &btstack);
  	}
  	if (rc) {
  		if (xlen)
  			xtTruncate(tid, ip, 0, COMMIT_PWMAP);
  		txAbort(tid, 0);
  		/* discard new inode */
  		goto out3;
  	}
  
  	mark_inode_dirty(ip);
  
  	dip->i_ctime = dip->i_mtime = CURRENT_TIME;
  	mark_inode_dirty(dip);
  	/*
  	 * commit update of parent directory and link object
  	 */
  
  	iplist[0] = dip;
  	iplist[1] = ip;
  	rc = txCommit(tid, 2, &iplist[0], 0);
  
        out3:
  	txEnd(tid);
  	mutex_unlock(&JFS_IP(ip)->commit_mutex);
  	mutex_unlock(&JFS_IP(dip)->commit_mutex);
  	if (rc) {
  		free_ea_wmap(ip);
  		clear_nlink(ip);
  		unlock_new_inode(ip);
  		iput(ip);
  	} else {
  		unlock_new_inode(ip);
  		d_instantiate(dentry, ip);
  	}
  
        out2:
  	free_UCSname(&dname);
  
        out1:
  	jfs_info("jfs_symlink: rc:%d", rc);
  	return rc;
  }
  
  
  /*
   * NAME:	jfs_rename
   *
   * FUNCTION:	rename a file or directory
   */
  static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
  	       struct inode *new_dir, struct dentry *new_dentry)
  {
  	struct btstack btstack;
  	ino_t ino;
  	struct component_name new_dname;
  	struct inode *new_ip;
  	struct component_name old_dname;
  	struct inode *old_ip;
  	int rc;
  	tid_t tid;
  	struct tlock *tlck;
  	struct dt_lock *dtlck;
  	struct lv *lv;
  	int ipcount;
  	struct inode *iplist[4];
  	struct tblock *tblk;
  	s64 new_size = 0;
  	int commit_flag;
  
  
  	jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry);
  
  	dquot_initialize(old_dir);
  	dquot_initialize(new_dir);
  
  	old_ip = old_dentry->d_inode;
  	new_ip = new_dentry->d_inode;
  
  	if ((rc = get_UCSname(&old_dname, old_dentry)))
  		goto out1;
  
  	if ((rc = get_UCSname(&new_dname, new_dentry)))
  		goto out2;
  
  	/*
  	 * Make sure source inode number is what we think it is
  	 */
  	rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
  	if (rc || (ino != old_ip->i_ino)) {
  		rc = -ENOENT;
  		goto out3;
  	}
  
  	/*
  	 * Make sure dest inode number (if any) is what we think it is
  	 */
  	rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
  	if (!rc) {
  		if ((!new_ip) || (ino != new_ip->i_ino)) {
  			rc = -ESTALE;
  			goto out3;
  		}
  	} else if (rc != -ENOENT)
  		goto out3;
  	else if (new_ip) {
  		/* no entry exists, but one was expected */
  		rc = -ESTALE;
  		goto out3;
  	}
  
  	if (S_ISDIR(old_ip->i_mode)) {
  		if (new_ip) {
  			if (!dtEmpty(new_ip)) {
  				rc = -ENOTEMPTY;
  				goto out3;
  			}
  		}
  	} else if (new_ip) {
  		IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
  		/* Init inode for quota operations. */
  		dquot_initialize(new_ip);
  	}
  
  	/*
  	 * The real work starts here
  	 */
  	tid = txBegin(new_dir->i_sb, 0);
  
  	/*
  	 * How do we know the locking is safe from deadlocks?
  	 * The vfs does the hard part for us.  Any time we are taking nested
  	 * commit_mutexes, the vfs already has i_mutex held on the parent.
  	 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
  	 */
  	mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
  	mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
  	if (old_dir != new_dir)
  		mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
  				  COMMIT_MUTEX_SECOND_PARENT);
  
  	if (new_ip) {
  		mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
  				  COMMIT_MUTEX_VICTIM);
  		/*
  		 * Change existing directory entry to new inode number
  		 */
  		ino = new_ip->i_ino;
  		rc = dtModify(tid, new_dir, &new_dname, &ino,
  			      old_ip->i_ino, JFS_RENAME);
  		if (rc)
  			goto out4;
  		drop_nlink(new_ip);
  		if (S_ISDIR(new_ip->i_mode)) {
  			drop_nlink(new_ip);
  			if (new_ip->i_nlink) {
  				mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
  				if (old_dir != new_dir)
  					mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
  				mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
  				mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
  				if (!S_ISDIR(old_ip->i_mode) && new_ip)
  					IWRITE_UNLOCK(new_ip);
  				jfs_error(new_ip->i_sb,
  					  "new_ip->i_nlink != 0\n");
  				return -EIO;
  			}
  			tblk = tid_to_tblock(tid);
  			tblk->xflag |= COMMIT_DELETE;
  			tblk->u.ip = new_ip;
  		} else if (new_ip->i_nlink == 0) {
  			assert(!test_cflag(COMMIT_Nolink, new_ip));
  			/* free block resources */
  			if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
  				txAbort(tid, 1);	/* Marks FS Dirty */
  				rc = new_size;
  				goto out4;
  			}
  			tblk = tid_to_tblock(tid);
  			tblk->xflag |= COMMIT_DELETE;
  			tblk->u.ip = new_ip;
  		} else {
  			new_ip->i_ctime = CURRENT_TIME;
  			mark_inode_dirty(new_ip);
  		}
  	} else {
  		/*
  		 * Add new directory entry
  		 */
  		rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
  			      JFS_CREATE);
  		if (rc) {
  			jfs_err("jfs_rename didn't expect dtSearch to fail "
  				"w/rc = %d", rc);
  			goto out4;
  		}
  
  		ino = old_ip->i_ino;
  		rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
  		if (rc) {
  			if (rc == -EIO)
  				jfs_err("jfs_rename: dtInsert returned -EIO");
  			goto out4;
  		}
  		if (S_ISDIR(old_ip->i_mode))
  			inc_nlink(new_dir);
  	}
  	/*
  	 * Remove old directory entry
  	 */
  
  	ino = old_ip->i_ino;
  	rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
  	if (rc) {
  		jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
  			rc);
  		txAbort(tid, 1);	/* Marks Filesystem dirty */
  		goto out4;
  	}
  	if (S_ISDIR(old_ip->i_mode)) {
  		drop_nlink(old_dir);
  		if (old_dir != new_dir) {
  			/*
  			 * Change inode number of parent for moved directory
  			 */
  
  			JFS_IP(old_ip)->i_dtroot.header.idotdot =
  				cpu_to_le32(new_dir->i_ino);
  
  			/* Linelock header of dtree */
  			tlck = txLock(tid, old_ip,
  				    (struct metapage *) &JFS_IP(old_ip)->bxflag,
  				      tlckDTREE | tlckBTROOT | tlckRELINK);
  			dtlck = (struct dt_lock *) & tlck->lock;
  			ASSERT(dtlck->index == 0);
  			lv = & dtlck->lv[0];
  			lv->offset = 0;
  			lv->length = 1;
  			dtlck->index++;
  		}
  	}
  
  	/*
  	 * Update ctime on changed/moved inodes & mark dirty
  	 */
  	old_ip->i_ctime = CURRENT_TIME;
  	mark_inode_dirty(old_ip);
  
  	new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
  	mark_inode_dirty(new_dir);
  
  	/* Build list of inodes modified by this transaction */
  	ipcount = 0;
  	iplist[ipcount++] = old_ip;
  	if (new_ip)
  		iplist[ipcount++] = new_ip;
  	iplist[ipcount++] = old_dir;
  
  	if (old_dir != new_dir) {
  		iplist[ipcount++] = new_dir;
  		old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
  		mark_inode_dirty(old_dir);
  	}
  
  	/*
  	 * Incomplete truncate of file data can
  	 * result in timing problems unless we synchronously commit the
  	 * transaction.
  	 */
  	if (new_size)
  		commit_flag = COMMIT_SYNC;
  	else
  		commit_flag = 0;
  
  	rc = txCommit(tid, ipcount, iplist, commit_flag);
  
        out4:
  	txEnd(tid);
  	if (new_ip)
  		mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
  	if (old_dir != new_dir)
  		mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
  	mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
  	mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
  
  	while (new_size && (rc == 0)) {
  		tid = txBegin(new_ip->i_sb, 0);
  		mutex_lock(&JFS_IP(new_ip)->commit_mutex);
  		new_size = xtTruncate_pmap(tid, new_ip, new_size);
  		if (new_size < 0) {
  			txAbort(tid, 1);
  			rc = new_size;
  		} else
  			rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
  		txEnd(tid);
  		mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
  	}
  	if (new_ip && (new_ip->i_nlink == 0))
  		set_cflag(COMMIT_Nolink, new_ip);
        out3:
  	free_UCSname(&new_dname);
        out2:
  	free_UCSname(&old_dname);
        out1:
  	if (new_ip && !S_ISDIR(new_ip->i_mode))
  		IWRITE_UNLOCK(new_ip);
  	/*
  	 * Truncating the directory index table is not guaranteed.  It
  	 * may need to be done iteratively
  	 */
  	if (test_cflag(COMMIT_Stale, old_dir)) {
  		if (old_dir->i_size > 1)
  			jfs_truncate_nolock(old_dir, 0);
  
  		clear_cflag(COMMIT_Stale, old_dir);
  	}
  
  	jfs_info("jfs_rename: returning %d", rc);
  	return rc;
  }
  
  
  /*
   * NAME:	jfs_mknod
   *
   * FUNCTION:	Create a special file (device)
   */
  static int jfs_mknod(struct inode *dir, struct dentry *dentry,
  		umode_t mode, dev_t rdev)
  {
  	struct jfs_inode_info *jfs_ip;
  	struct btstack btstack;
  	struct component_name dname;
  	ino_t ino;
  	struct inode *ip;
  	struct inode *iplist[2];
  	int rc;
  	tid_t tid;
  	struct tblock *tblk;
  
  	if (!new_valid_dev(rdev))
  		return -EINVAL;
  
  	jfs_info("jfs_mknod: %pd", dentry);
  
  	dquot_initialize(dir);
  
  	if ((rc = get_UCSname(&dname, dentry)))
  		goto out;
  
  	ip = ialloc(dir, mode);
  	if (IS_ERR(ip)) {
  		rc = PTR_ERR(ip);
  		goto out1;
  	}
  	jfs_ip = JFS_IP(ip);
  
  	tid = txBegin(dir->i_sb, 0);
  
  	mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
  	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
  
  	rc = jfs_init_acl(tid, ip, dir);
  	if (rc)
  		goto out3;
  
  	rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
  	if (rc) {
  		txAbort(tid, 0);
  		goto out3;
  	}
  
  	if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
  		txAbort(tid, 0);
  		goto out3;
  	}
  
  	tblk = tid_to_tblock(tid);
  	tblk->xflag |= COMMIT_CREATE;
  	tblk->ino = ip->i_ino;
  	tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
  
  	ino = ip->i_ino;
  	if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
  		txAbort(tid, 0);
  		goto out3;
  	}
  
  	ip->i_op = &jfs_file_inode_operations;
  	jfs_ip->dev = new_encode_dev(rdev);
  	init_special_inode(ip, ip->i_mode, rdev);
  
  	mark_inode_dirty(ip);
  
  	dir->i_ctime = dir->i_mtime = CURRENT_TIME;
  
  	mark_inode_dirty(dir);
  
  	iplist[0] = dir;
  	iplist[1] = ip;
  	rc = txCommit(tid, 2, iplist, 0);
  
        out3:
  	txEnd(tid);
  	mutex_unlock(&JFS_IP(ip)->commit_mutex);
  	mutex_unlock(&JFS_IP(dir)->commit_mutex);
  	if (rc) {
  		free_ea_wmap(ip);
  		clear_nlink(ip);
  		unlock_new_inode(ip);
  		iput(ip);
  	} else {
  		unlock_new_inode(ip);
  		d_instantiate(dentry, ip);
  	}
  
        out1:
  	free_UCSname(&dname);
  
        out:
  	jfs_info("jfs_mknod: returning %d", rc);
  	return rc;
  }
  
  static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
  {
  	struct btstack btstack;
  	ino_t inum;
  	struct inode *ip;
  	struct component_name key;
  	int rc;
  
  	jfs_info("jfs_lookup: name = %pd", dentry);
  
  	if ((rc = get_UCSname(&key, dentry)))
  		return ERR_PTR(rc);
  	rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
  	free_UCSname(&key);
  	if (rc == -ENOENT) {
  		ip = NULL;
  	} else if (rc) {
  		jfs_err("jfs_lookup: dtSearch returned %d", rc);
  		ip = ERR_PTR(rc);
  	} else {
  		ip = jfs_iget(dip->i_sb, inum);
  		if (IS_ERR(ip))
  			jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
  	}
  
  	return d_splice_alias(ip, dentry);
  }
  
  static struct inode *jfs_nfs_get_inode(struct super_block *sb,
  		u64 ino, u32 generation)
  {
  	struct inode *inode;
  
  	if (ino == 0)
  		return ERR_PTR(-ESTALE);
  	inode = jfs_iget(sb, ino);
  	if (IS_ERR(inode))
  		return ERR_CAST(inode);
  
  	if (generation && inode->i_generation != generation) {
  		iput(inode);
  		return ERR_PTR(-ESTALE);
  	}
  
  	return inode;
  }
  
  struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
  		int fh_len, int fh_type)
  {
  	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
  				    jfs_nfs_get_inode);
  }
  
  struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
  		int fh_len, int fh_type)
  {
  	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
  				    jfs_nfs_get_inode);
  }
  
  struct dentry *jfs_get_parent(struct dentry *dentry)
  {
  	unsigned long parent_ino;
  
  	parent_ino =
  		le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
  
  	return d_obtain_alias(jfs_iget(dentry->d_inode->i_sb, parent_ino));
  }
  
  const struct inode_operations jfs_dir_inode_operations = {
  	.create		= jfs_create,
  	.lookup		= jfs_lookup,
  	.link		= jfs_link,
  	.unlink		= jfs_unlink,
  	.symlink	= jfs_symlink,
  	.mkdir		= jfs_mkdir,
  	.rmdir		= jfs_rmdir,
  	.mknod		= jfs_mknod,
  	.rename		= jfs_rename,
  	.setxattr	= jfs_setxattr,
  	.getxattr	= jfs_getxattr,
  	.listxattr	= jfs_listxattr,
  	.removexattr	= jfs_removexattr,
  	.setattr	= jfs_setattr,
  #ifdef CONFIG_JFS_POSIX_ACL
  	.get_acl	= jfs_get_acl,
  	.set_acl	= jfs_set_acl,
  #endif
  };
  
  const struct file_operations jfs_dir_operations = {
  	.read		= generic_read_dir,
  	.iterate	= jfs_readdir,
  	.fsync		= jfs_fsync,
  	.unlocked_ioctl = jfs_ioctl,
  #ifdef CONFIG_COMPAT
  	.compat_ioctl	= jfs_compat_ioctl,
  #endif
  	.llseek		= generic_file_llseek,
  };
  
  static int jfs_ci_hash(const struct dentry *dir, struct qstr *this)
  {
  	unsigned long hash;
  	int i;
  
  	hash = init_name_hash();
  	for (i=0; i < this->len; i++)
  		hash = partial_name_hash(tolower(this->name[i]), hash);
  	this->hash = end_name_hash(hash);
  
  	return 0;
  }
  
  static int jfs_ci_compare(const struct dentry *parent, const struct dentry *dentry,
  		unsigned int len, const char *str, const struct qstr *name)
  {
  	int i, result = 1;
  
  	if (len != name->len)
  		goto out;
  	for (i=0; i < len; i++) {
  		if (tolower(str[i]) != tolower(name->name[i]))
  			goto out;
  	}
  	result = 0;
  out:
  	return result;
  }
  
  static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags)
  {
  	/*
  	 * This is not negative dentry. Always valid.
  	 *
  	 * Note, rename() to existing directory entry will have ->d_inode,
  	 * and will use existing name which isn't specified name by user.
  	 *
  	 * We may be able to drop this positive dentry here. But dropping
  	 * positive dentry isn't good idea. So it's unsupported like
  	 * rename("filename", "FILENAME") for now.
  	 */
  	if (dentry->d_inode)
  		return 1;
  
  	/*
  	 * This may be nfsd (or something), anyway, we can't see the
  	 * intent of this. So, since this can be for creation, drop it.
  	 */
  	if (!flags)
  		return 0;
  
  	/*
  	 * Drop the negative dentry, in order to make sure to use the
  	 * case sensitive name which is specified by user if this is
  	 * for creation.
  	 */
  	if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
  		return 0;
  	return 1;
  }
  
  const struct dentry_operations jfs_ci_dentry_operations =
  {
  	.d_hash = jfs_ci_hash,
  	.d_compare = jfs_ci_compare,
  	.d_revalidate = jfs_ci_revalidate,
  };
  