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133 lines
5.0 KiB
C
133 lines
5.0 KiB
C
/*
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* mft.h - Exports for MFT record handling. Originated from the Linux-NTFS project.
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*
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* Copyright (c) 2000-2002 Anton Altaparmakov
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* Copyright (c) 2004-2005 Richard Russon
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* Copyright (c) 2006-2008 Szabolcs Szakacsits
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the NTFS-3G
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _NTFS_MFT_H
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#define _NTFS_MFT_H
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#include "volume.h"
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#include "inode.h"
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#include "layout.h"
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#include "logging.h"
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extern int ntfs_mft_records_read( const ntfs_volume *vol, const MFT_REF mref,
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const s64 count, MFT_RECORD *b );
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/**
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* ntfs_mft_record_read - read a record from the mft
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* @vol: volume to read from
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* @mref: mft record number to read
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* @b: output data buffer
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*
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* Read the mft record specified by @mref from volume @vol into buffer @b.
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* Return 0 on success or -1 on error, with errno set to the error code.
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*
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* The read mft record is mst deprotected and is hence ready to use. The caller
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* should check the record with is_baad_record() in case mst deprotection
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* failed.
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*
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* NOTE: @b has to be at least of size vol->mft_record_size.
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*/
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static __inline__ int ntfs_mft_record_read( const ntfs_volume *vol,
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const MFT_REF mref, MFT_RECORD *b )
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{
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int ret;
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ntfs_log_enter( "Entering for inode %lld\n", ( long long )MREF( mref ) );
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ret = ntfs_mft_records_read( vol, mref, 1, b );
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ntfs_log_leave( "\n" );
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return ret;
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}
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extern int ntfs_mft_record_check( const ntfs_volume *vol, const MFT_REF mref,
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MFT_RECORD *m );
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extern int ntfs_file_record_read( const ntfs_volume *vol, const MFT_REF mref,
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MFT_RECORD **mrec, ATTR_RECORD **attr );
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extern int ntfs_mft_records_write( const ntfs_volume *vol, const MFT_REF mref,
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const s64 count, MFT_RECORD *b );
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/**
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* ntfs_mft_record_write - write an mft record to disk
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* @vol: volume to write to
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* @mref: mft record number to write
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* @b: data buffer containing the mft record to write
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*
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* Write the mft record specified by @mref from buffer @b to volume @vol.
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* Return 0 on success or -1 on error, with errno set to the error code.
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*
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* Before the mft record is written, it is mst protected. After the write, it
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* is deprotected again, thus resulting in an increase in the update sequence
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* number inside the buffer @b.
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*
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* NOTE: @b has to be at least of size vol->mft_record_size.
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*/
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static __inline__ int ntfs_mft_record_write( const ntfs_volume *vol,
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const MFT_REF mref, MFT_RECORD *b )
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{
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int ret;
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ntfs_log_enter( "Entering for inode %lld\n", ( long long )MREF( mref ) );
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ret = ntfs_mft_records_write( vol, mref, 1, b );
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ntfs_log_leave( "\n" );
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return ret;
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}
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/**
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* ntfs_mft_record_get_data_size - return number of bytes used in mft record @b
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* @m: mft record to get the data size of
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*
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* Takes the mft record @m and returns the number of bytes used in the record
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* or 0 on error (i.e. @m is not a valid mft record). Zero is not a valid size
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* for an mft record as it at least has to have the MFT_RECORD itself and a
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* zero length attribute of type AT_END, thus making the minimum size 56 bytes.
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*
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* Aside: The size is independent of NTFS versions 1.x/3.x because the 8-byte
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* alignment of the first attribute mask the difference in MFT_RECORD size
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* between NTFS 1.x and 3.x. Also, you would expect every mft record to
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* contain an update sequence array as well but that could in theory be
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* non-existent (don't know if Windows' NTFS driver/chkdsk wouldn't view this
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* as corruption in itself though).
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*/
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static __inline__ u32 ntfs_mft_record_get_data_size( const MFT_RECORD *m )
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{
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if ( !m || !ntfs_is_mft_record( m->magic ) )
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return 0;
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/* Get the number of used bytes and return it. */
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return le32_to_cpu( m->bytes_in_use );
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}
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extern int ntfs_mft_record_layout( const ntfs_volume *vol, const MFT_REF mref,
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MFT_RECORD *mrec );
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extern int ntfs_mft_record_format( const ntfs_volume *vol, const MFT_REF mref );
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extern ntfs_inode *ntfs_mft_record_alloc( ntfs_volume *vol, ntfs_inode *base_ni );
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extern int ntfs_mft_record_free( ntfs_volume *vol, ntfs_inode *ni );
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extern int ntfs_mft_usn_dec( MFT_RECORD *mrec );
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#endif /* defined _NTFS_MFT_H */
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