projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a1d312de | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 1da177e4 LT |
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 | |
| 1da177e4 LT |
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 | * | |
| 933906f8 | 82 | * Locking the page also serializes us against ->read_folio() if the page is not |
| 1da177e4 LT |
83 | * uptodate. |
| 84 | * | |
| 85 | * On success, clean the mft record and return 0. On error, leave the mft | |
| f95c4018 | 86 | * record dirty and return -errno. |
| 1da177e4 LT |
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 | ||
| c49c3111 | 100 | extern bool ntfs_may_write_mft_record(ntfs_volume *vol, |
| 1da177e4 LT |
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 */ |