From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Fri, 1 May 2009 00:27:39 +0000 (+0200)
Subject: kill-the-BKL/reiserfs: release the write lock on flush_commit_list()
X-Git-Tag: firefly_0821_release~9833^2~3455^2~41
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6e3647acb4f200add1d8e0203514f7ac925ae463;p=firefly-linux-kernel-4.4.55.git

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 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) ;
 		}
 	}