FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/mft.h

     /*
      * mft.h - Defines for mft record handling in NTFS Linux kernel driver.
      *         Part of the Linux-NTFS project.
      *
      * Copyright (c) 2001-2004 Anton Altaparmakov
      *
      * This program/include file 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/include file 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 (in the main directory of the Linux-NTFS
     * distribution in the file COPYING); if not, write to the Free Software
     * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     */
    
    #ifndef _LINUX_NTFS_MFT_H
    #define _LINUX_NTFS_MFT_H
    
    #include <linux/fs.h>
    #include <linux/highmem.h>
    #include <linux/pagemap.h>
    
    #include "inode.h"
    
    extern MFT_RECORD *map_mft_record(ntfs_inode *ni);
    extern void unmap_mft_record(ntfs_inode *ni);
    
    extern MFT_RECORD *map_extent_mft_record(ntfs_inode *base_ni, MFT_REF mref,
                    ntfs_inode **ntfs_ino);
    
    static inline void unmap_extent_mft_record(ntfs_inode *ni)
    {
            unmap_mft_record(ni);
            return;
    }
    
    #ifdef NTFS_RW
    
    /**
     * flush_dcache_mft_record_page - flush_dcache_page() for mft records
     * @ni:         ntfs inode structure of mft record
     *
     * Call flush_dcache_page() for the page in which an mft record resides.
     *
     * This must be called every time an mft record is modified, just after the
     * modification.
     */
    static inline void flush_dcache_mft_record_page(ntfs_inode *ni)
    {
            flush_dcache_page(ni->page);
    }
    
    extern void __mark_mft_record_dirty(ntfs_inode *ni);
    
    /**
     * mark_mft_record_dirty - set the mft record and the page containing it dirty
     * @ni:         ntfs inode describing the mapped mft record
     *
     * Set the mapped (extent) mft record of the (base or extent) ntfs inode @ni,
     * as well as the page containing the mft record, dirty.  Also, mark the base
     * vfs inode dirty.  This ensures that any changes to the mft record are
     * written out to disk.
     *
     * NOTE:  Do not do anything if the mft record is already marked dirty.
     */
    static inline void mark_mft_record_dirty(ntfs_inode *ni)
    {
            if (!NInoTestSetDirty(ni))
                    __mark_mft_record_dirty(ni);
    }
    
    extern int ntfs_sync_mft_mirror(ntfs_volume *vol, const unsigned long mft_no,
                    MFT_RECORD *m, int sync);
    
    extern int write_mft_record_nolock(ntfs_inode *ni, MFT_RECORD *m, int sync);
    
    /**
     * write_mft_record - write out a mapped (extent) mft record
     * @ni:         ntfs inode describing the mapped (extent) mft record
     * @m:          mapped (extent) mft record to write
     * @sync:       if true, wait for i/o completion
     *
     * This is just a wrapper for write_mft_record_nolock() (see mft.c), which
     * locks the page for the duration of the write.  This ensures that there are
     * no race conditions between writing the mft record via the dirty inode code
     * paths and via the page cache write back code paths or between writing
     * neighbouring mft records residing in the same page.
     *
     * Locking the page also serializes us against ->readpage() if the page is not
     * uptodate.
     *
     * On success, clean the mft record and return 0.  On error, leave the mft
    * record dirty and return -errno.
    */
   static inline int write_mft_record(ntfs_inode *ni, MFT_RECORD *m, int sync)
   {
           struct page *page = ni->page;
           int err;
   
           BUG_ON(!page);
           lock_page(page);
           err = write_mft_record_nolock(ni, m, sync);
           unlock_page(page);
           return err;
   }
   
   extern bool ntfs_may_write_mft_record(ntfs_volume *vol,
                   const unsigned long mft_no, const MFT_RECORD *m,
                   ntfs_inode **locked_ni);
   
   extern ntfs_inode *ntfs_mft_record_alloc(ntfs_volume *vol, const int mode,
                   ntfs_inode *base_ni, MFT_RECORD **mrec);
   extern int ntfs_extent_mft_record_free(ntfs_inode *ni, MFT_RECORD *m);
   
   #endif /* NTFS_RW */
   
   #endif /* _LINUX_NTFS_MFT_H */

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