Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.

drivers/filesystems/ext2/src/ext4/ext4_bh.c

@@ -0,0 +1,68 @@
+#include <ext2fs.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+
+/*
+ * extents_bread: This function is a wrapper of CcPinRead routine.
+ * 
+ * @sb:    the device we need to undergo buffered IO on.
+ * @block: the block we want to read from.
+ *
+ * If the call to this routine succeeds, the pages underlying the buffer header
+ * will be locked into memory, so that the buffer header returned for use is safe.
+ */
+struct buffer_head *
+extents_bread(struct super_block *sb, sector_t block)
+{
+    return sb_getblk(sb, block);
+}
+
+/*
+ * extents_bwrite: This function is a wrapper of CcPreparePinWrite routine.
+ * 
+ * @sb:    the device we need to undergo buffered IO on.
+ * @block: the block we want to write to.
+ */
+struct buffer_head *
+extents_bwrite(struct super_block *sb, sector_t block)
+{
+    return sb_getblk_zero(sb, block);
+
+}
+
+/*
+ * extents_mark_buffer_dirty: Mark the buffer dirtied and so
+ *                            that changes will be written back.
+ * 
+ * @bh: The corresponding buffer header that is modified.
+ */
+void extents_mark_buffer_dirty(struct buffer_head *bh)
+{
+    set_buffer_dirty(bh);
+}
+
+/*
+ * extents_brelse: Release the corresponding buffer header.
+ *
+ * @bh: The corresponding buffer header that is going to be freed.
+ *
+ * The pages underlying the buffer header will be unlocked.
+ */
+void extents_brelse(struct buffer_head *bh)
+{
+    brelse(bh);
+}
+
+/*
+ * extents_bforget: Release the corresponding buffer header.
+ * NOTE: The page owned by @bh will be marked invalidated.
+ *
+ * @bh: The corresponding buffer header that is going to be freed.
+ *
+ * The pages underlying the buffer header will be unlocked.
+ */
+void extents_bforget(struct buffer_head *bh)
+{
+    clear_buffer_uptodate(bh);
+    bforget(bh);
+}