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/*

 * 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 */