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>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 5cd600baf8cf..ffb7f50abc2f 100644
--- 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) ;
                 }
         }