--- a/fs/fat/cache.c	2004-11-18 19:42:41.701778200 +0100
+++ b/fs/fat/cache.c	2004-11-18 18:40:25.000000000 +0100
@@ -271,6 +271,7 @@
 			mark_buffer_dirty(bh2);
 		}
 		mark_buffer_dirty(bh);
+
 		for (copy = 1; copy < sbi->fats; copy++) {
 			b = sbi->fat_start + (first >> sb->s_blocksize_bits)
 				+ sbi->fat_length * copy;
--- a/fs/fat/dir.c	2004-11-18 19:42:41.704777744 +0100
+++ b/fs/fat/dir.c	2004-11-18 14:36:44.000000000 +0100
@@ -736,6 +736,7 @@
 {
 	struct buffer_head *bh;
 	struct msdos_dir_entry *de;
+	struct super_block *sb;
 	__le16 date, time;
 
 	bh = fat_extend_dir(dir);
@@ -764,6 +765,11 @@
 	dir->i_atime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 	mark_inode_dirty(dir);
 
+	sb = dir->i_sb;
+
+	if (sb->s_flags & MS_SYNCHRONOUS)
+		sync_dirty_buffer(bh);
+
 	return 0;
 }
 
--- a/fs/fat/file.c	2004-10-18 23:53:44.000000000 +0200
+++ b/fs/fat/file.c	2004-11-18 14:57:03.000000000 +0100
@@ -74,21 +74,34 @@
 {
 	struct inode *inode = filp->f_dentry->d_inode;
 	int retval;
+	struct super_block *sb = inode->i_sb;
+	struct buffer_head *bh = NULL;
 
 	retval = generic_file_write(filp, buf, count, ppos);
 	if (retval > 0) {
 		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 		MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
 		mark_inode_dirty(inode);
+		if (sb->s_flags & MS_SYNCHRONOUS) {
+			bh = sb_bread(sb, MSDOS_SB(sb)->fsinfo_sector);
+			if (bh != NULL) {
+				sync_dirty_buffer(bh);
+				brelse(bh);
+			} else {
+				BUG_ON(1);
+			}
+		}
 	}
 	return retval;
 }
 
 void fat_truncate(struct inode *inode)
 {
+	struct super_block *sb = inode->i_sb;
 	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
 	const unsigned int cluster_size = sbi->cluster_size;
 	int nr_clusters;
+	struct buffer_head *bh = NULL;
 
 	/* 
 	 * This protects against truncating a file bigger than it was then
@@ -105,4 +118,8 @@
 	unlock_kernel();
 	inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 	mark_inode_dirty(inode);
+	if (sb->s_flags & MS_SYNCHRONOUS) {
+		bh = sb_bread(sb, sbi->fsinfo_sector);
+		sync_dirty_buffer(bh);
+	}
 }
--- a/fs/fat/inode.c	2004-11-18 19:42:41.710776832 +0100
+++ b/fs/fat/inode.c	2004-11-18 15:00:55.000000000 +0100
@@ -1273,8 +1273,12 @@
 	}
 	spin_unlock(&sbi->inode_hash_lock);
 	mark_buffer_dirty(bh);
-	brelse(bh);
 	unlock_kernel();
+
+	if (sb->s_flags & MS_SYNCHRONOUS)
+		sync_dirty_buffer(bh);
+	brelse(bh);
+
 	return 0;
 }