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diff --git a/include/ntfs-3g/mft.h b/include/ntfs-3g/mft.h new file mode 100755 index 0000000..bb15f0f --- a/dev/null +++ b/include/ntfs-3g/mft.h @@ -0,0 +1,132 @@ +/* + * mft.h - Exports for MFT record handling. Originated from the Linux-NTFS project. + * + * Copyright (c) 2000-2002 Anton Altaparmakov + * Copyright (c) 2004-2005 Richard Russon + * Copyright (c) 2006-2008 Szabolcs Szakacsits + * + * 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 NTFS-3G + * 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 _NTFS_MFT_H +#define _NTFS_MFT_H + +#include "volume.h" +#include "inode.h" +#include "layout.h" +#include "logging.h" + +extern int ntfs_mft_records_read(const ntfs_volume *vol, const MFT_REF mref, + const s64 count, MFT_RECORD *b); + +/** + * ntfs_mft_record_read - read a record from the mft + * @vol: volume to read from + * @mref: mft record number to read + * @b: output data buffer + * + * Read the mft record specified by @mref from volume @vol into buffer @b. + * Return 0 on success or -1 on error, with errno set to the error code. + * + * The read mft record is mst deprotected and is hence ready to use. The caller + * should check the record with is_baad_record() in case mst deprotection + * failed. + * + * NOTE: @b has to be at least of size vol->mft_record_size. + */ +static __inline__ int ntfs_mft_record_read(const ntfs_volume *vol, + const MFT_REF mref, MFT_RECORD *b) +{ + int ret; + + ntfs_log_enter("Entering for inode %lld\n", (long long)MREF(mref)); + ret = ntfs_mft_records_read(vol, mref, 1, b); + ntfs_log_leave("\n"); + return ret; +} + +extern int ntfs_mft_record_check(const ntfs_volume *vol, const MFT_REF mref, + MFT_RECORD *m); + +extern int ntfs_file_record_read(const ntfs_volume *vol, const MFT_REF mref, + MFT_RECORD **mrec, ATTR_RECORD **attr); + +extern int ntfs_mft_records_write(const ntfs_volume *vol, const MFT_REF mref, + const s64 count, MFT_RECORD *b); + +/** + * ntfs_mft_record_write - write an mft record to disk + * @vol: volume to write to + * @mref: mft record number to write + * @b: data buffer containing the mft record to write + * + * Write the mft record specified by @mref from buffer @b to volume @vol. + * Return 0 on success or -1 on error, with errno set to the error code. + * + * Before the mft record is written, it is mst protected. After the write, it + * is deprotected again, thus resulting in an increase in the update sequence + * number inside the buffer @b. + * + * NOTE: @b has to be at least of size vol->mft_record_size. + */ +static __inline__ int ntfs_mft_record_write(const ntfs_volume *vol, + const MFT_REF mref, MFT_RECORD *b) +{ + int ret; + + ntfs_log_enter("Entering for inode %lld\n", (long long)MREF(mref)); + ret = ntfs_mft_records_write(vol, mref, 1, b); + ntfs_log_leave("\n"); + return ret; +} + +/** + * ntfs_mft_record_get_data_size - return number of bytes used in mft record @b + * @m: mft record to get the data size of + * + * Takes the mft record @m and returns the number of bytes used in the record + * or 0 on error (i.e. @m is not a valid mft record). Zero is not a valid size + * for an mft record as it at least has to have the MFT_RECORD itself and a + * zero length attribute of type AT_END, thus making the minimum size 56 bytes. + * + * Aside: The size is independent of NTFS versions 1.x/3.x because the 8-byte + * alignment of the first attribute mask the difference in MFT_RECORD size + * between NTFS 1.x and 3.x. Also, you would expect every mft record to + * contain an update sequence array as well but that could in theory be + * non-existent (don't know if Windows' NTFS driver/chkdsk wouldn't view this + * as corruption in itself though). + */ +static __inline__ u32 ntfs_mft_record_get_data_size(const MFT_RECORD *m) +{ + if (!m || !ntfs_is_mft_record(m->magic)) + return 0; + /* Get the number of used bytes and return it. */ + return le32_to_cpu(m->bytes_in_use); +} + +extern int ntfs_mft_record_layout(const ntfs_volume *vol, const MFT_REF mref, + MFT_RECORD *mrec); + +extern int ntfs_mft_record_format(const ntfs_volume *vol, const MFT_REF mref); + +extern ntfs_inode *ntfs_mft_record_alloc(ntfs_volume *vol, ntfs_inode *base_ni); + +extern int ntfs_mft_record_free(ntfs_volume *vol, ntfs_inode *ni); + +extern int ntfs_mft_usn_dec(MFT_RECORD *mrec); + +#endif /* defined _NTFS_MFT_H */ + |