Revert "ext4: wait on all pending commits in ext4_sync_fs()"

(cherry picked from commit 9eddacf9e9c03578ef2c07c9534423e823d677f8)

This undoes commit 14ce0cb411c88681ab8f3a4c9caa7f42e97a3184.

Since jbd2_journal_start_commit() is now fixed to return 1 when we
started a transaction commit, there's some transaction waiting to be
committed or there's a transaction already committing, we don't
need to call ext4_force_commit() in ext4_sync_fs(). Furthermore
ext4_force_commit() can unnecessarily create sync transaction which is
expensive so it's worthwhile to remove it when we can.

http://bugzilla.kernel.org/show_bug.cgi?id=12224

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Eric Sandeen <sandeen@redhat.com>
Cc: linux-ext4@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 5e4491d..db2642a 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2950,14 +2950,14 @@ static void ext4_write_super(struct super_block *sb)
 
 static int ext4_sync_fs(struct super_block *sb, int wait)
 {
-       int ret = 0;
+       tid_t target;
 
        sb->s_dirt = 0;
-       if (wait)
-               ret = ext4_force_commit(sb);
-       else
-               jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, NULL);
-       return ret;
+       if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
+               if (wait)
+                       jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
+       }
+       return 0;
 }
 
 /*