[PATCH] ext3: fix list scanning in __cleanup_transaction

Fix a bug in list scanning that can cause us to skip the last buffer on the
checkpoint list (and hence fail to do any progress under some rather
unfavorable conditions).

The problem is we first do jh=next_jh and then test

	} while (jh!=last_jh);

Hence we skip the last buffer on the list (if it was not the only buffer on
the list).  As we already do jh=next_jh; in the beginning of the loop we
are safe to just remove the assignment in the end.  It can happen that 'jh'
will be freed at the point we test jh != last_jh but that does not matter
as we never *dereference* the pointer.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/jbd/checkpoint.c b/fs/jbd/checkpoint.c
index 58133ab9457e251dfcefbc062b491408afcca02a..5a97e346bd95a247c12f0edcc5b33d1b065d6419 100644 (file)
--- a/fs/jbd/checkpoint.c
+++ b/fs/jbd/checkpoint.c
@@ -188,7 +188,6 @@ static int __cleanup_transaction(journal_t *journal, transaction_t *transaction)
                } else {
                        jbd_unlock_bh_state(bh);
                }
-               jh = next_jh;
        } while (jh != last_jh);
 
        return ret;