namei.c 36.9 KB
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/*
 *   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
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 *   the Free Software Foundation; either version 2 of the License, or
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 *   (at your option) any later version.
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 *
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 *   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
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 *   along with this program;  if not, write to the Free Software
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 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/quotaops.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
 */
struct dentry_operations jfs_ci_dentry_operations;

static s64 commitZeroLink(tid_t, struct inode *);

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/*
 * NAME:	free_ea_wmap(inode)
 *
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 * FUNCTION:	free uncommitted extended attributes from working map
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 *
 */
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>
 *
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 * PARAMETER:	dip	- parent directory vnode
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 *		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, int mode,
		struct nameidata *nd)
{
	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:%s", dip, dentry->d_name.name);

	/*
	 * 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);
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	if (IS_ERR(ip)) {
		rc = PTR_ERR(ip);
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		goto out2;
	}

	tid = txBegin(dip->i_sb, 0);

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	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
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	rc = jfs_init_acl(tid, ip, dip);
	if (rc)
		goto out3;

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	rc = jfs_init_security(tid, ip, dip);
	if (rc) {
		txAbort(tid, 0);
		goto out3;
	}

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	if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
		jfs_err("jfs_create: dtSearch returned %d", rc);
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		txAbort(tid, 0);
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		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;

	insert_inode_hash(ip);
	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);
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	mutex_unlock(&JFS_IP(ip)->commit_mutex);
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	mutex_unlock(&JFS_IP(dip)->commit_mutex);
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	if (rc) {
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		free_ea_wmap(ip);
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		ip->i_nlink = 0;
		iput(ip);
	} else
		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>
 *
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 * PARAMETER:	dip	- parent directory vnode
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 *		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, int 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:%s", dip, dentry->d_name.name);

	/* link count overflow on parent directory ? */
	if (dip->i_nlink == JFS_LINK_MAX) {
		rc = -EMLINK;
		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);
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	if (IS_ERR(ip)) {
		rc = PTR_ERR(ip);
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		goto out2;
	}

	tid = txBegin(dip->i_sb, 0);

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	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
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	rc = jfs_init_acl(tid, ip, dip);
	if (rc)
		goto out3;

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	rc = jfs_init_security(tid, ip, dip);
	if (rc) {
		txAbort(tid, 0);
		goto out3;
	}

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	if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
		jfs_err("jfs_mkdir: dtSearch returned %d", rc);
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		txAbort(tid, 0);
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		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;
	}

	ip->i_nlink = 2;	/* for '.' */
	ip->i_op = &jfs_dir_inode_operations;
	ip->i_fop = &jfs_dir_operations;

	insert_inode_hash(ip);
	mark_inode_dirty(ip);

	/* update parent directory inode */
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	inc_nlink(dip);		/* for '..' from child directory */
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	dip->i_ctime = dip->i_mtime = CURRENT_TIME;
	mark_inode_dirty(dip);

	rc = txCommit(tid, 2, &iplist[0], 0);

      out3:
	txEnd(tid);
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	mutex_unlock(&JFS_IP(ip)->commit_mutex);
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	mutex_unlock(&JFS_IP(dip)->commit_mutex);
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	if (rc) {
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		free_ea_wmap(ip);
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		ip->i_nlink = 0;
		iput(ip);
	} else
		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
 *
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 * PARAMETER:	dip	- parent inode
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 *		dentry	- child directory dentry
 *
 * RETURN:	-EINVAL	- if name is . or ..
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 *		-EINVAL - if . or .. exist but are invalid.
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 *		errors from subroutines
 *
 * note:
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 * 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
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 * 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:%s", dip, dentry->d_name.name);

	/* Init inode for quota operations. */
	DQUOT_INIT(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);

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	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
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	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);
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		mutex_unlock(&JFS_IP(ip)->commit_mutex);
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		mutex_unlock(&JFS_IP(dip)->commit_mutex);
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		goto out2;
	}

	/* update parent directory's link count corresponding
	 * to ".." entry of the target directory deleted
	 */
	dip->i_ctime = dip->i_mtime = CURRENT_TIME;
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	inode_dec_link_count(dip);
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	/*
	 * 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 */
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	clear_nlink(ip);
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	mark_inode_dirty(ip);

	rc = txCommit(tid, 2, &iplist[0], 0);

	txEnd(tid);

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	mutex_unlock(&JFS_IP(ip)->commit_mutex);
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	mutex_unlock(&JFS_IP(dip)->commit_mutex);
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	/*
	 * 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)
 *
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 * FUNCTION:	remove a link to object <vp> named by <name>
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 *		from parent directory <dvp>
 *
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 * PARAMETER:	dip	- inode of parent directory
 *		dentry	- dentry of object to be removed
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 *
 * 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:%s", dip, dentry->d_name.name);

	/* Init inode for quota operations. */
	DQUOT_INIT(ip);

	if ((rc = get_UCSname(&dname, dentry)))
		goto out;

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	IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
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	tid = txBegin(dip->i_sb, 0);

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	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
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	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);
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		mutex_unlock(&JFS_IP(ip)->commit_mutex);
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		mutex_unlock(&JFS_IP(dip)->commit_mutex);
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		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 */
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	inode_dec_link_count(ip);
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	/*
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	 *	commit zero link count object
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	 */
	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);
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			mutex_unlock(&JFS_IP(ip)->commit_mutex);
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			mutex_unlock(&JFS_IP(dip)->commit_mutex);
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			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);

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	mutex_unlock(&JFS_IP(ip)->commit_mutex);
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	mutex_unlock(&JFS_IP(dip)->commit_mutex);
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	while (new_size && (rc == 0)) {
		tid = txBegin(dip->i_sb, 0);
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		mutex_lock(&JFS_IP(ip)->commit_mutex);
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		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);
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		mutex_unlock(&JFS_IP(ip)->commit_mutex);
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	}

	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()
 *
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 * FUNCTION:	for non-directory, called by jfs_remove(),
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 *		truncate a regular file, directory or symbolic
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 *		link to zero length. return 0 if type is not
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 *		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.
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 *		(? for temporary file - memory object is cached even
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 *		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):
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	 * free xtree/data pages from cache if COMMIT_PWMAP,
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	 * 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;
}


/*
677
 * NAME:	jfs_free_zero_link()
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 *
679
 * FUNCTION:	for non-directory, called by iClose(),
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 *		free resources of a file from cache and WORKING map
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 *		for a file previously committed with zero link count
 *		while associated with a pager object,
 *
 * PARAMETER:	ip	- pointer to inode of file.
 */
686
void jfs_free_zero_link(struct inode *ip)
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{
	int type;

690
	jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
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	/* 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)
703
			return;
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		break;
	default:
706
		return;
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	}

	/*
	 * 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)
756
		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>
 *
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 * PARAMETER:	vp	- target object
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 *		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: %s %s", old_dentry->d_name.name,
		 dentry->d_name.name);

	if (ip->i_nlink == JFS_LINK_MAX)
		return -EMLINK;

	if (ip->i_nlink == 0)
		return -ENOENT;

	tid = txBegin(ip->i_sb, 0);

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Dave Kleikamp 已提交
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	mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
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	/*
	 * 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 */
825
	inc_nlink(ip);		/* for new link */
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	ip->i_ctime = CURRENT_TIME;
827
	dir->i_ctime = dir->i_mtime = CURRENT_TIME;
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	mark_inode_dirty(dir);
	atomic_inc(&ip->i_count);

	iplist[0] = ip;
	iplist[1] = dir;
	rc = txCommit(tid, 2, &iplist[0], 0);

	if (rc) {
836
		ip->i_nlink--; /* never instantiated */
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		iput(ip);
	} else
		d_instantiate(dentry, ip);

      free_dname:
	free_UCSname(&dname);

      out:
	txEnd(tid);

847
	mutex_unlock(&JFS_IP(ip)->commit_mutex);
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Evgeniy Dushistov 已提交
848
	mutex_unlock(&JFS_IP(dir)->commit_mutex);
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	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>
858
 *			in directory <dip>
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 *
860 861 862 863
 * 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
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 *
 * 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 extent = 0, 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);

	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);
909 910
	if (IS_ERR(ip)) {
		rc = PTR_ERR(ip);
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		goto out2;
	}

	tid = txBegin(dip->i_sb, 0);

D
Dave Kleikamp 已提交
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	mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
L
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D
Dave Kleikamp 已提交
919 920 921 922
	rc = jfs_init_security(tid, ip, dip);
	if (rc)
		goto out3;

L
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923 924 925 926 927 928
	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
D
Dave Kleikamp 已提交
929
	 * (dir_create() ANDs in the u.u_cmask,
L
Linus Torvalds 已提交
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
	 * 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_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 = &page_symlink_inode_operations;
		ip->i_mapping->a_ops = &jfs_aops;

		/*
D
Dave Kleikamp 已提交
970
		 * even though the data of symlink object (source
L
Linus Torvalds 已提交
971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
		 * 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;
		}
		extent = xaddr;
		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;
	}

	insert_inode_hash(ip);
	mark_inode_dirty(ip);

1024 1025
	dip->i_ctime = dip->i_mtime = CURRENT_TIME;
	mark_inode_dirty(dip);
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1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
	/*
	 * commit update of parent directory and link object
	 */

	iplist[0] = dip;
	iplist[1] = ip;
	rc = txCommit(tid, 2, &iplist[0], 0);

      out3:
	txEnd(tid);
1036
	mutex_unlock(&JFS_IP(ip)->commit_mutex);
E
Evgeniy Dushistov 已提交
1037
	mutex_unlock(&JFS_IP(dip)->commit_mutex);
L
Linus Torvalds 已提交
1038
	if (rc) {
1039
		free_ea_wmap(ip);
L
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1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
		ip->i_nlink = 0;
		iput(ip);
	} else
		d_instantiate(dentry, ip);

      out2:
	free_UCSname(&dname);

      out1:
	jfs_info("jfs_symlink: rc:%d", rc);
	return rc;
}


/*
1055
 * NAME:	jfs_rename
L
Linus Torvalds 已提交
1056
 *
1057
 * FUNCTION:	rename a file or directory
L
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1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
 */
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: %s %s", old_dentry->d_name.name,
		 new_dentry->d_name.name);

	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 == 0) {
		if ((new_ip == 0) || (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_dir != old_dir) &&
			   (new_dir->i_nlink == JFS_LINK_MAX)) {
			rc = -EMLINK;
			goto out3;
		}
	} else if (new_ip) {
D
Dave Kleikamp 已提交
1130
		IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
L
Linus Torvalds 已提交
1131 1132 1133 1134 1135 1136 1137 1138 1139
		/* Init inode for quota operations. */
		DQUOT_INIT(new_ip);
	}

	/*
	 * The real work starts here
	 */
	tid = txBegin(new_dir->i_sb, 0);

D
Dave Kleikamp 已提交
1140 1141 1142 1143 1144 1145 1146 1147
	/*
	 * 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);
L
Linus Torvalds 已提交
1148
	if (old_dir != new_dir)
D
Dave Kleikamp 已提交
1149 1150
		mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
				  COMMIT_MUTEX_SECOND_PARENT);
L
Linus Torvalds 已提交
1151 1152

	if (new_ip) {
D
Dave Kleikamp 已提交
1153 1154
		mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
				  COMMIT_MUTEX_VICTIM);
L
Linus Torvalds 已提交
1155 1156 1157 1158 1159 1160 1161 1162
		/*
		 * 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;
1163
		drop_nlink(new_ip);
L
Linus Torvalds 已提交
1164
		if (S_ISDIR(new_ip->i_mode)) {
1165
			drop_nlink(new_ip);
L
Linus Torvalds 已提交
1166
			if (new_ip->i_nlink) {
E
Evgeniy Dushistov 已提交
1167
				mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
L
Linus Torvalds 已提交
1168
				if (old_dir != new_dir)
1169
					mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
E
Evgeniy Dushistov 已提交
1170 1171
				mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
				mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
L
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1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
				if (!S_ISDIR(old_ip->i_mode) && new_ip)
					IWRITE_UNLOCK(new_ip);
				jfs_error(new_ip->i_sb,
					  "jfs_rename: new_ip->i_nlink != 0");
				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 */
D
Dave Kleikamp 已提交
1186
				rc = new_size;
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				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))
1216
			inc_nlink(new_dir);
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	}
	/*
	 * 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)) {
1231
		drop_nlink(old_dir);
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1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
		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)
1290
		mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
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	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);
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	while (new_size && (rc == 0)) {
		tid = txBegin(new_ip->i_sb, 0);
1298
		mutex_lock(&JFS_IP(new_ip)->commit_mutex);
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		new_size = xtTruncate_pmap(tid, new_ip, new_size);
		if (new_size < 0) {
			txAbort(tid, 1);
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			rc = new_size;
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		} else
			rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
		txEnd(tid);
1306
		mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
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	}
	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;
}


/*
1334
 * NAME:	jfs_mknod
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 *
1336
 * FUNCTION:	Create a special file (device)
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 */
static int jfs_mknod(struct inode *dir, struct dentry *dentry,
		int 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: %s", dentry->d_name.name);

	if ((rc = get_UCSname(&dname, dentry)))
		goto out;

	ip = ialloc(dir, mode);
1360 1361
	if (IS_ERR(ip)) {
		rc = PTR_ERR(ip);
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		goto out1;
	}
	jfs_ip = JFS_IP(ip);

	tid = txBegin(dir->i_sb, 0);

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	mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
	mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
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1371 1372
	rc = jfs_init_acl(tid, ip, dir);
	if (rc)
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		goto out3;

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	rc = jfs_init_security(tid, ip, dir);
	if (rc) {
		txAbort(tid, 0);
		goto out3;
	}

1381 1382 1383 1384 1385
	if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
		txAbort(tid, 0);
		goto out3;
	}

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	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;
1392 1393
	if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
		txAbort(tid, 0);
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		goto out3;
1395
	}
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	ip->i_op = &jfs_file_inode_operations;
	jfs_ip->dev = new_encode_dev(rdev);
	init_special_inode(ip, ip->i_mode, rdev);

	insert_inode_hash(ip);
	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);
1414 1415
	mutex_unlock(&JFS_IP(ip)->commit_mutex);
	mutex_unlock(&JFS_IP(dir)->commit_mutex);
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	if (rc) {
1417
		free_ea_wmap(ip);
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		ip->i_nlink = 0;
		iput(ip);
	} else
		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, struct nameidata *nd)
{
	struct btstack btstack;
	ino_t inum;
	struct inode *ip;
	struct component_name key;
	const char *name = dentry->d_name.name;
	int len = dentry->d_name.len;
	int rc;

	jfs_info("jfs_lookup: name = %s", name);

1443 1444
	if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)
		dentry->d_op = &jfs_ci_dentry_operations;
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	if ((name[0] == '.') && (len == 1))
		inum = dip->i_ino;
	else if (strcmp(name, "..") == 0)
		inum = PARENT(dip);
	else {
		if ((rc = get_UCSname(&key, dentry)))
			return ERR_PTR(rc);
		rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
		free_UCSname(&key);
		if (rc == -ENOENT) {
			d_add(dentry, NULL);
			return ERR_PTR(0);
		} else if (rc) {
			jfs_err("jfs_lookup: dtSearch returned %d", rc);
			return ERR_PTR(rc);
		}
	}

	ip = iget(dip->i_sb, inum);
	if (ip == NULL || is_bad_inode(ip)) {
		jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
		if (ip)
			iput(ip);
		return ERR_PTR(-EACCES);
	}

	dentry = d_splice_alias(ip, dentry);

	if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2))
		dentry->d_op = &jfs_ci_dentry_operations;

	return dentry;
}

1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511
struct dentry *jfs_get_dentry(struct super_block *sb, void *vobjp)
{
	__u32 *objp = vobjp;
	unsigned long ino = objp[0];
	__u32 generation = objp[1];
	struct inode *inode;
	struct dentry *result;

	if (ino == 0)
		return ERR_PTR(-ESTALE);
	inode = iget(sb, ino);
	if (inode == NULL)
		return ERR_PTR(-ENOMEM);

	if (is_bad_inode(inode) ||
	    (generation && inode->i_generation != generation)) {
	    	result = ERR_PTR(-ESTALE);
		goto out_iput;
	}

	result = d_alloc_anon(inode);
	if (!result) {
		result = ERR_PTR(-ENOMEM);
		goto out_iput;
	}
	return result;

 out_iput:
	iput(inode);
	return result;
}

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1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537
struct dentry *jfs_get_parent(struct dentry *dentry)
{
	struct super_block *sb = dentry->d_inode->i_sb;
	struct dentry *parent = ERR_PTR(-ENOENT);
	struct inode *inode;
	unsigned long parent_ino;

	parent_ino =
		le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
	inode = iget(sb, parent_ino);
	if (inode) {
		if (is_bad_inode(inode)) {
			iput(inode);
			parent = ERR_PTR(-EACCES);
		} else {
			parent = d_alloc_anon(inode);
			if (!parent) {
				parent = ERR_PTR(-ENOMEM);
				iput(inode);
			}
		}
	}

	return parent;
}

1538
const struct inode_operations jfs_dir_inode_operations = {
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	.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,
#ifdef CONFIG_JFS_POSIX_ACL
	.setattr	= jfs_setattr,
	.permission	= jfs_permission,
#endif
};

1558
const struct file_operations jfs_dir_operations = {
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1559 1560 1561
	.read		= generic_read_dir,
	.readdir	= jfs_readdir,
	.fsync		= jfs_fsync,
1562
	.ioctl		= jfs_ioctl,
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};

static int jfs_ci_hash(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(struct dentry *dir, struct qstr *a, struct qstr *b)
{
	int i, result = 1;

	if (a->len != b->len)
		goto out;
	for (i=0; i < a->len; i++) {
		if (tolower(a->name[i]) != tolower(b->name[i]))
			goto out;
	}
	result = 0;

	/*
	 * We want creates to preserve case.  A negative dentry, a, that
	 * has a different case than b may cause a new entry to be created
	 * with the wrong case.  Since we can't tell if a comes from a negative
	 * dentry, we blindly replace it with b.  This should be harmless if
	 * a is not a negative dentry.
	 */
	memcpy((unsigned char *)a->name, b->name, a->len);
out:
	return result;
}

struct dentry_operations jfs_ci_dentry_operations =
{
	.d_hash = jfs_ci_hash,
	.d_compare = jfs_ci_compare,
};