ClabureDB: Classified Bug-Reports Database

   /*
    *   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/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
   */
  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, 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);
         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);
         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;
 
         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);
         mutex_unlock(&JFS_IP(ip)->commit_mutex);
         mutex_unlock(&JFS_IP(dip)->commit_mutex);
         if (rc) {
                 free_ea_wmap(ip);
                 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>
  *
  * 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, 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);
         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);
         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;
         }
 
         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 */
         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);
                 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
  *
  * 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_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);
 
         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_INIT(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);
 
         if (ip->i_nlink == JFS_LINK_MAX)
                 return -EMLINK;
 
         if (ip->i_nlink == 0)
                 return -ENOENT;
 
         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);
         atomic_inc(&ip->i_count);
 
         iplist[0] = ip;
         iplist[1] = dir;
         rc = txCommit(tid, 2, &iplist[0], 0);
 
         if (rc) {
                 ip->i_nlink--; /* 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 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);
         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);
         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_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;
 
                 /*
                  * 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;
                 }
                 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);

        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);
                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;
}


/*
 * 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);

        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_dir != old_dir) &&
                           (new_dir->i_nlink == JFS_LINK_MAX)) {
                        rc = -EMLINK;
                        goto out3;
                }
        } else if (new_ip) {
                IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
                /* Init inode for quota operations. */
                DQUOT_INIT(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,
                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);
        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);
        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);

        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);
        mutex_unlock(&JFS_IP(ip)->commit_mutex);
        mutex_unlock(&JFS_IP(dir)->commit_mutex);
        if (rc) {
                free_ea_wmap(ip);
                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);

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

        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 NULL;
                } else if (rc) {
                        jfs_err("jfs_lookup: dtSearch returned %d", rc);
                        return ERR_PTR(rc);
                }
        }

        ip = jfs_iget(dip->i_sb, inum);
        if (IS_ERR(ip)) {
                jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
                return ERR_CAST(ip);
        }

        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;
}

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,
#ifdef CONFIG_JFS_POSIX_ACL
        .setattr        = jfs_setattr,
        .permission        = jfs_permission,
#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(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,
};