patch-2_6_7-vs1_9_1_12

[linux-2.6.git] / fs / ntfs / mft.h

diff --git a/fs/ntfs/mft.h b/fs/ntfs/mft.h
index 38965db..4fd9b5e 100644 (file)
--- a/fs/ntfs/mft.h
+++ b/fs/ntfs/mft.h
@@ -2,7 +2,7 @@
  * mft.h - Defines for mft record handling in NTFS Linux kernel driver.
  *        Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2004 Anton Altaparmakov.
+ * Copyright (c) 2001-2004 Anton Altaparmakov
  *
  * This program/include file is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as published
@@ -28,8 +28,6 @@
 #include "inode.h"
 
 extern int format_mft_record(ntfs_inode *ni, MFT_RECORD *m);
-//extern int format_mft_record2(struct super_block *vfs_sb,
-//             const unsigned long inum, MFT_RECORD *m);
 
 extern MFT_RECORD *map_mft_record(ntfs_inode *ni);
 extern void unmap_mft_record(ntfs_inode *ni);
@@ -59,6 +57,60 @@ static inline void flush_dcache_mft_record_page(ntfs_inode *ni)
        flush_dcache_page(ni->page);
 }
 
+extern void __mark_mft_record_dirty(ntfs_inode *ni);
+
+/**
+ * mark_mft_record_dirty - set the mft record and the page containing it dirty
+ * @ni:                ntfs inode describing the mapped mft record
+ *
+ * Set the mapped (extent) mft record of the (base or extent) ntfs inode @ni,
+ * as well as the page containing the mft record, dirty.  Also, mark the base
+ * vfs inode dirty.  This ensures that any changes to the mft record are
+ * written out to disk.
+ *
+ * NOTE:  Do not do anything if the mft record is already marked dirty.
+ */
+static inline void mark_mft_record_dirty(ntfs_inode *ni)
+{
+       if (!NInoTestSetDirty(ni))
+               __mark_mft_record_dirty(ni);
+}
+
+extern int write_mft_record_nolock(ntfs_inode *ni, MFT_RECORD *m, int sync);
+
+/**
+ * write_mft_record - write out a mapped (extent) mft record
+ * @ni:                ntfs inode describing the mapped (extent) mft record
+ * @m:         mapped (extent) mft record to write
+ * @sync:      if true, wait for i/o completion
+ *
+ * This is just a wrapper for write_mft_record_nolock() (see mft.c), which
+ * locks the page for the duration of the write.  This ensures that there are
+ * no race conditions between writing the mft record via the dirty inode code
+ * paths and via the page cache write back code paths or between writing
+ * neighbouring mft records residing in the same page.
+ *
+ * Locking the page also serializes us against ->readpage() if the page is not
+ * uptodate.
+ *
+ * On success, clean the mft record and return 0.  On error, leave the mft
+ * record dirty and return -errno.  The caller should call make_bad_inode() on
+ * the base inode to ensure no more access happens to this inode.  We do not do
+ * it here as the caller may want to finish writing other extent mft records
+ * first to minimize on-disk metadata inconsistencies.
+ */
+static inline int write_mft_record(ntfs_inode *ni, MFT_RECORD *m, int sync)
+{
+       struct page *page = ni->page;
+       int err;
+
+       BUG_ON(!page);
+       lock_page(page);
+       err = write_mft_record_nolock(ni, m, sync);
+       unlock_page(page);
+       return err;
+}
+
 #endif /* NTFS_RW */
 
 #endif /* _LINUX_NTFS_MFT_H */