kill-the-BKL/reiserfs: release the write lock before rescheduling on do_journal_end()

When do_journal_end() copies data to the journal blocks buffers in memory,
it reschedules if needed between each block copied and dirtyfied.

We can also release the write lock at this rescheduling stage,
like did the bkl implicitly.

[ Impact: release the reiserfs write lock when it is not needed ]

Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 0ba98ca367c7ef573992578c5fea816be6c92059..5cd600baf8cfe49ebe8b2d72ce37b407c6ce8bd2 100644 (file)
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -4232,7 +4232,9 @@ static int do_journal_end(struct reiserfs_transaction_handle *th,
                next = cn->next;
                free_cnode(sb, cn);
                cn = next;
+               reiserfs_write_unlock(sb);
                cond_resched();
+               reiserfs_write_lock(sb);
        }
 
        /* we are done  with both the c_bh and d_bh, but