[PATCH] reiserfs: fix transaction overflowing

This patch fixes a bug in reiserfs truncate.  A transaction might overflow
when truncating long highly fragmented file.  The fix is to split
truncation into several transactions to avoid overflowing.

Signed-off-by: Vladimir V. Saveliev <vs@namesys.com>
Cc; Charles McColgan <cm@chuck.net>
Cc: Alexander Zarochentsev <zam@namesys.com>
Cc: Hans Reiser <reiser@namesys.com>
Cc: Chris Mason <mason@suse.com>
Cc: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/reiserfs_fs.h

diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
index dad78ce..912f1b7 100644
--- a/include/linux/reiserfs_fs.h
+++ b/include/linux/reiserfs_fs.h
@@ -1704,6 +1704,11 @@
 	return 0;
 }
 
+static inline int reiserfs_transaction_free_space(struct reiserfs_transaction_handle *th)
+{
+	return th->t_blocks_allocated - th->t_blocks_logged;
+}
+
 int reiserfs_async_progress_wait(struct super_block *s);
 
 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct