fs/ntfs/mft.h

   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
  18 extern MFT_RECORD *map_mft_record(ntfs_inode *ni);
  19 extern void unmap_mft_record(ntfs_inode *ni);
  20
  21 extern MFT_RECORD *map_extent_mft_record(ntfs_inode *base_ni, MFT_REF mref,
  22                 ntfs_inode **ntfs_ino);
  23
  24 static 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  */
  41 static inline void flush_dcache_mft_record_page(ntfs_inode *ni)
  42 {
  43         flush_dcache_page(ni->page);
  44 }
  45
  46 extern 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  */
  59 static inline void mark_mft_record_dirty(ntfs_inode *ni)
  60 {
  61         if (!NInoTestSetDirty(ni))
  62                 __mark_mft_record_dirty(ni);
  63 }
  64
  65 extern int ntfs_sync_mft_mirror(ntfs_volume *vol, const unsigned long mft_no,
  66                 MFT_RECORD *m, int sync);
  67
  68 extern 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 ->readpage() 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  */
  88 static 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
 100 extern 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
 104 extern ntfs_inode *ntfs_mft_record_alloc(ntfs_volume *vol, const int mode,
 105                 ntfs_inode *base_ni, MFT_RECORD **mrec);
 106 extern int ntfs_extent_mft_record_free(ntfs_inode *ni, MFT_RECORD *m);
 107
 108 #endif /* NTFS_RW */
 109
 110 #endif /* _LINUX_NTFS_MFT_H */