namei.c

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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
 *   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:%s", dip, dentry->d_name.name);

    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:%s", dip, dentry->d_name.name);

    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:%s", dip, dentry->d_name.name);

    /* 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:%s", dip, dentry->d_name.name);

    /* 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: %s %s", old_dentry->d_name.name,
         dentry->d_name.name);

    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: %s %s", old_dentry->d_name.name,
         new_dentry->d_name.name);

    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,
                      "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 */
                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: %s", dentry->d_name.name);

    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 = %s", dentry->d_name.name);

    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,
#endif
};

const struct file_operations jfs_dir_operations = {
    .read       = generic_read_dir,
    .readdir    = 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, const struct inode *inode,
        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 inode *pinode,
        const struct dentry *dentry, const struct inode *inode,
        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,
};