[patch 22/27] ext3 truncate fix

[Andrew Morton]

Forward-port of a fix which Stephen has applied to ext3's 2.4 CVS tree.

Fix for a rare problem seen under stress in data=journal mode: if we
have to restart a truncate transaction while traversing the inode's
direct blocks, we need to deal with bh==NULL in ext3_clear_blocks.

 inode.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

--- 2.5.24/fs/ext3/inode.c~ext3-truncate-fix	Thu Jul  4 16:17:31 2002
+++ 2.5.24-akpm/fs/ext3/inode.c	Thu Jul  4 16:17:31 2002
@@ -1632,8 +1632,10 @@ ext3_clear_blocks(handle_t *handle, stru
 		}
 		ext3_mark_inode_dirty(handle, inode);
 		ext3_journal_test_restart(handle, inode);
-		BUFFER_TRACE(bh, "get_write_access");
-		ext3_journal_get_write_access(handle, bh);
+		if (bh) {
+			BUFFER_TRACE(bh, "retaking write access");
+			ext3_journal_get_write_access(handle, bh);
+		}
 	}
 
 	/*

-