Release 4.10 fs/jfs/namei.c

/*
 *   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;
}

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/*
 * 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);

	rc = dquot_initialize(dip);
	if (rc)
		goto out1;

	/*
         * 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(dip);

	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;
}


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dave kleikamp
dave kleikamp
495
92.35%
14
51.85%
al viro
al viro
8
1.49%
4
14.81%
akinobu mita
akinobu mita
7
1.31%
1
3.70%
ingo molnar
ingo molnar
6
1.12%
1
3.70%
christoph hellwig
christoph hellwig
5
0.93%
2
7.41%
eric paris
eric paris
5
0.93%
1
3.70%
deepa dinamani
deepa dinamani
4
0.75%
1
3.70%
miklos szeredi
miklos szeredi
3
0.56%
1
3.70%
evgeniy dushistov
evgeniy dushistov
2
0.37%
1
3.70%
trond myklebust
trond myklebust
1
0.19%
1
3.70%
Total
536
100.00%
27
100.00%

/*
 * 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);

	rc = dquot_initialize(dip);
	if (rc)
		goto out1;

	/*
         * 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(dip);
	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;
}

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dave kleikamp
dave kleikamp
500
91.74%
14
51.85%
miklos szeredi
miklos szeredi
7
1.28%
2
7.41%
akinobu mita
akinobu mita
7
1.28%
1
3.70%
al viro
al viro
6
1.10%
3
11.11%
ingo molnar
ingo molnar
6
1.10%
1
3.70%
christoph hellwig
christoph hellwig
5
0.92%
2
7.41%
eric paris
eric paris
5
0.92%
1
3.70%
deepa dinamani
deepa dinamani
4
0.73%
1
3.70%
dave hansen
dave hansen
3
0.55%
1
3.70%
evgeniy dushistov
evgeniy dushistov
2
0.37%
1
3.70%
Total
545
100.00%
27
100.00%

/*
 * 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 = d_inode(dentry);
	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. */
	rc = dquot_initialize(dip);
	if (rc)
		goto out;
	rc = dquot_initialize(ip);
	if (rc)
		goto out;

	/* 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(dip);
	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;
}

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dave kleikamp
469
93.61%
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55.00%
ingo molnar
ingo molnar
10
2.00%
1
5.00%
christoph hellwig
christoph hellwig
6
1.20%
2
10.00%
evgeniy dushistov
evgeniy dushistov
4
0.80%
1
5.00%
dave hansen
dave hansen
4
0.80%
2
10.00%
deepa dinamani
deepa dinamani
4
0.80%
1
5.00%
david howells
david howells
3
0.60%
1
5.00%
al viro
al viro
1
0.20%
1
5.00%
Total
501
100.00%
20
100.00%

/*
 * 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 = d_inode(dentry);
	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. */
	rc = dquot_initialize(dip);
	if (rc)
		goto out;
	rc = dquot_initialize(ip);
	if (rc)
		goto out;

	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(ip);
	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;
}

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dave kleikamp
598
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60.00%
ingo molnar
ingo molnar
18
2.83%
1
5.00%
evgeniy dushistov
evgeniy dushistov
6
0.94%
1
5.00%
christoph hellwig
christoph hellwig
6
0.94%
2
10.00%
deepa dinamani
deepa dinamani
4
0.63%
1
5.00%
david howells
david howells
3
0.47%
1
5.00%
al viro
al viro
1
0.16%
1
5.00%
dave hansen
dave hansen
1
0.16%
1
5.00%
Total
637
100.00%
20
100.00%

/*
 * 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;
}


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/*
 * 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);
}

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/*
 * 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 = d_inode(old_dentry);
	ino_t ino;
	struct component_name dname;
	struct btstack btstack;
	struct inode *iplist[2];

	jfs_info("jfs_link: %pd %pd", old_dentry, dentry);

	rc = dquot_initialize(dir);
	if (rc)
		goto out;

	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_tx;

	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(ip);
	dir->i_ctime = dir->i_mtime = current_time(dir);
	mark_inode_dirty(dir);
	ihold(ip);

	iplist[0]