[XFS] Export end_buffer_async_write, needed for unwritten extent support in XFS.

SGI Modid: 2.5.x-xfs:slinx:141507a

fs/buffer.c

@@ -532,7 +532,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate)
  * Completion handler for block_write_full_page() - pages which are unlocked
  * during I/O, and which have PageWriteback cleared upon I/O completion.
  */
-static void end_buffer_async_write(struct buffer_head *bh, int uptodate)
+void end_buffer_async_write(struct buffer_head *bh, int uptodate)
 {
 	static spinlock_t page_uptodate_lock = SPIN_LOCK_UNLOCKED;
 	unsigned long flags;

include/linux/buffer_head.h

@@ -137,6 +137,7 @@ int try_to_free_buffers(struct page *);
 void create_empty_buffers(struct page *, unsigned long,
 			unsigned long b_state);
 void end_buffer_io_sync(struct buffer_head *bh, int uptodate);
+void end_buffer_async_write(struct buffer_head *bh, int uptodate);
 
 /* Things to do with buffers at mapping->private_list */
 void buffer_insert_list(spinlock_t *lock,

kernel/ksyms.c

@@ -175,6 +175,7 @@ EXPORT_SYMBOL(d_lookup);
 EXPORT_SYMBOL(d_path);
 EXPORT_SYMBOL(mark_buffer_dirty);
 EXPORT_SYMBOL(end_buffer_io_sync);
+EXPORT_SYMBOL(end_buffer_async_write);
 EXPORT_SYMBOL(__mark_inode_dirty);
 EXPORT_SYMBOL(get_empty_filp);
 EXPORT_SYMBOL(open_private_file);