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 */ 111