linux-kernel - [PATCH 2/2] fs: print a message when freezing/unfreezing filesystems

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Message-Id: <1400005862-3751-2-git-send-email-mguzik@redhat.com>
Date:	Tue, 13 May 2014 20:31:02 +0200
From:	Mateusz Guzik <mguzik@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, Josef Bacik <jbacik@...com>,
	Jan Kara <jack@...e.cz>, Al Viro <viro@...IV.linux.org.uk>,
	Eric Sandeen <esandeen@...hat.com>
Subject: [PATCH 2/2] fs: print a message when freezing/unfreezing filesystems

This helps hang troubleshooting efforts when only dmesg is available.

Signed-off-by: Mateusz Guzik <mguzik@...hat.com>
Cc: linux-fsdevel@...r.kernel.org
Cc: Josef Bacik <jbacik@...com>
Cc: Jan Kara <jack@...e.cz>
Cc: Al Viro <viro@...IV.linux.org.uk>
Cc: Eric Sandeen <esandeen@...hat.com>

---
 fs/super.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/fs/super.c b/fs/super.c
index 017e10a..581c008 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1289,12 +1289,9 @@ int freeze_super(struct super_block *sb)
 		return 0;	/* sic - it's "nothing to do" */
 	}
 
-	if (sb->s_flags & MS_RDONLY) {
+	if (sb->s_flags & MS_RDONLY)
 		/* Nothing to do really... */
-		sb->s_writers.frozen = SB_FREEZE_COMPLETE;
-		up_write(&sb->s_umount);
-		return 0;
-	}
+		goto out;
 
 	/* From now on, no new normal writers can start */
 	sb->s_writers.frozen = SB_FREEZE_WRITE;
@@ -1335,8 +1332,10 @@ int freeze_super(struct super_block *sb)
 	 * This is just for debugging purposes so that fs can warn if it
 	 * sees write activity when frozen is set to SB_FREEZE_COMPLETE.
 	 */
+out:
 	sb->s_writers.frozen = SB_FREEZE_COMPLETE;
 	up_write(&sb->s_umount);
+	pr_info("VFS:Filesystem %s thawed\n", sb->s_id);
 	return 0;
 }
 EXPORT_SYMBOL(freeze_super);
@@ -1374,7 +1373,7 @@ out:
 	smp_wmb();
 	wake_up(&sb->s_writers.wait_unfrozen);
 	deactivate_locked_super(sb);
-
+	pr_info("VFS:Filesystem %s thawed\n", sb->s_id);
 	return 0;
 }
 EXPORT_SYMBOL(thaw_super);
-- 
1.8.3.1

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