kill-the-BKL/reiserfs: release the write lock on flush_commit_list()

flush_commit_list() uses ll_rw_block() to commit the pending log blocks.
ll_rw_block() might sleep, and the bkl was released at this point. Then
we can also relax the write lock at this point.

[ 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 5cd600baf8cfe49ebe8b2d72ce37b407c6ce8bd2..ffb7f50abc2fe0a932c44685042edae4e0ba5ce2 100644 (file)
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -1120,8 +1120,11 @@ static int flush_commit_list(struct super_block *s,
                    SB_ONDISK_JOURNAL_SIZE(s);
                tbh = journal_find_get_block(s, bn);
                if (tbh) {
-                       if (buffer_dirty(tbh))
-                           ll_rw_block(WRITE, 1, &tbh) ;
+                       if (buffer_dirty(tbh)) {
+                           reiserfs_write_unlock(s);
+                           ll_rw_block(WRITE, 1, &tbh);
+                           reiserfs_write_lock(s);
+                       }
                        put_bh(tbh) ;
                }
        }