cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mft.h (3305B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * mft.h - Defines for mft record handling in NTFS Linux kernel driver.
      4 *	   Part of the Linux-NTFS project.
      5 *
      6 * Copyright (c) 2001-2004 Anton Altaparmakov
      7 */
      8
      9#ifndef _LINUX_NTFS_MFT_H
     10#define _LINUX_NTFS_MFT_H
     11
     12#include <linux/fs.h>
     13#include <linux/highmem.h>
     14#include <linux/pagemap.h>
     15
     16#include "inode.h"
     17
     18extern MFT_RECORD *map_mft_record(ntfs_inode *ni);
     19extern void unmap_mft_record(ntfs_inode *ni);
     20
     21extern MFT_RECORD *map_extent_mft_record(ntfs_inode *base_ni, MFT_REF mref,
     22		ntfs_inode **ntfs_ino);
     23
     24static inline void unmap_extent_mft_record(ntfs_inode *ni)
     25{
     26	unmap_mft_record(ni);
     27	return;
     28}
     29
     30#ifdef NTFS_RW
     31
     32/**
     33 * flush_dcache_mft_record_page - flush_dcache_page() for mft records
     34 * @ni:		ntfs inode structure of mft record
     35 *
     36 * Call flush_dcache_page() for the page in which an mft record resides.
     37 *
     38 * This must be called every time an mft record is modified, just after the
     39 * modification.
     40 */
     41static inline void flush_dcache_mft_record_page(ntfs_inode *ni)
     42{
     43	flush_dcache_page(ni->page);
     44}
     45
     46extern void __mark_mft_record_dirty(ntfs_inode *ni);
     47
     48/**
     49 * mark_mft_record_dirty - set the mft record and the page containing it dirty
     50 * @ni:		ntfs inode describing the mapped mft record
     51 *
     52 * Set the mapped (extent) mft record of the (base or extent) ntfs inode @ni,
     53 * as well as the page containing the mft record, dirty.  Also, mark the base
     54 * vfs inode dirty.  This ensures that any changes to the mft record are
     55 * written out to disk.
     56 *
     57 * NOTE:  Do not do anything if the mft record is already marked dirty.
     58 */
     59static inline void mark_mft_record_dirty(ntfs_inode *ni)
     60{
     61	if (!NInoTestSetDirty(ni))
     62		__mark_mft_record_dirty(ni);
     63}
     64
     65extern int ntfs_sync_mft_mirror(ntfs_volume *vol, const unsigned long mft_no,
     66		MFT_RECORD *m, int sync);
     67
     68extern int write_mft_record_nolock(ntfs_inode *ni, MFT_RECORD *m, int sync);
     69
     70/**
     71 * write_mft_record - write out a mapped (extent) mft record
     72 * @ni:		ntfs inode describing the mapped (extent) mft record
     73 * @m:		mapped (extent) mft record to write
     74 * @sync:	if true, wait for i/o completion
     75 *
     76 * This is just a wrapper for write_mft_record_nolock() (see mft.c), which
     77 * locks the page for the duration of the write.  This ensures that there are
     78 * no race conditions between writing the mft record via the dirty inode code
     79 * paths and via the page cache write back code paths or between writing
     80 * neighbouring mft records residing in the same page.
     81 *
     82 * Locking the page also serializes us against ->read_folio() if the page is not
     83 * uptodate.
     84 *
     85 * On success, clean the mft record and return 0.  On error, leave the mft
     86 * record dirty and return -errno.
     87 */
     88static inline int write_mft_record(ntfs_inode *ni, MFT_RECORD *m, int sync)
     89{
     90	struct page *page = ni->page;
     91	int err;
     92
     93	BUG_ON(!page);
     94	lock_page(page);
     95	err = write_mft_record_nolock(ni, m, sync);
     96	unlock_page(page);
     97	return err;
     98}
     99
    100extern bool ntfs_may_write_mft_record(ntfs_volume *vol,
    101		const unsigned long mft_no, const MFT_RECORD *m,
    102		ntfs_inode **locked_ni);
    103
    104extern ntfs_inode *ntfs_mft_record_alloc(ntfs_volume *vol, const int mode,
    105		ntfs_inode *base_ni, MFT_RECORD **mrec);
    106extern int ntfs_extent_mft_record_free(ntfs_inode *ni, MFT_RECORD *m);
    107
    108#endif /* NTFS_RW */
    109
    110#endif /* _LINUX_NTFS_MFT_H */