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