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Message-ID: <20150713212552.GA13876@redhat.com>
Date: Mon, 13 Jul 2015 23:25:52 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Al Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Paul McKenney <paulmck@...ux.vnet.ibm.com>,
Peter Zijlstra <peterz@...radead.org>
Cc: Daniel Wagner <daniel.wagner@...-carit.de>,
Davidlohr Bueso <dave@...olabs.net>,
Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] introduce sb_unlock_frozen()
Preaparation. Add the trivial helper which does the wakeup.
---
fs/super.c | 12 ++++++++----
1 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/fs/super.c b/fs/super.c
index 5ea0edd..c23bafc 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1254,6 +1254,12 @@ static void sb_wait_write(struct super_block *sb, int level)
} while (writers);
}
+static void sb_unlock_frozen(struct super_block *sb)
+{
+ smp_wmb();
+ wake_up(&sb->s_writers.wait_unfrozen);
+}
+
/**
* freeze_super - lock the filesystem and force it into a consistent state
* @sb: the super to lock
@@ -1340,8 +1346,7 @@ int freeze_super(struct super_block *sb)
printk(KERN_ERR
"VFS:Filesystem freeze failed\n");
sb->s_writers.frozen = SB_UNFROZEN;
- smp_wmb();
- wake_up(&sb->s_writers.wait_unfrozen);
+ sb_unlock_frozen(sb);
deactivate_locked_super(sb);
return ret;
}
@@ -1387,8 +1392,7 @@ int thaw_super(struct super_block *sb)
out:
sb->s_writers.frozen = SB_UNFROZEN;
- smp_wmb();
- wake_up(&sb->s_writers.wait_unfrozen);
+ sb_unlock_frozen(sb);
deactivate_locked_super(sb);
return 0;
--
1.5.5.1
--
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