linux-kernel - [PATCH 2/3] dm: Export function dm_suspend

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Date:	Sun,  5 Apr 2015 19:20:18 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, Neil Brown <neilb@...e.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>
Cc:	dm-devel@...hat.com, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH 2/3] dm: Export function dm_suspend_md()

This patch exports function dm_suspend_md() which suspend mapped device so other
kernel drivers can use it and could suspend mapped device when needed.

Signed-off-by: Pali Rohár <pali.rohar@...il.com>
---
 drivers/md/dm.c |    6 ++++++
 drivers/md/dm.h |    5 +++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 8001fe9..919ce95 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -3053,6 +3053,12 @@ out:
 	return r;
 }
 
+int dm_suspend_md(struct mapped_device *md)
+{
+	return dm_suspend(md, DM_SUSPEND_LOCKFS_FLAG);
+}
+EXPORT_SYMBOL_GPL(dm_suspend_md);
+
 /*
  * Internal suspend/resume works like userspace-driven suspend. It waits
  * until all bios finish and prevents issuing new bios to the target drivers.
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 59f53e7..623c9a8 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -152,6 +152,11 @@ int dm_test_deferred_remove_flag(struct mapped_device *md);
 void dm_deferred_remove(void);
 
 /*
+ * Suspend mapped_device
+ */
+int dm_suspend_md(struct mapped_device *md);
+
+/*
  * The device-mapper can be driven through one of two interfaces;
  * ioctl or filesystem, depending which patch you have applied.
  */
-- 
1.7.9.5

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