mft.h
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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 */