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Date:   Wed,  9 Jan 2019 13:31:27 +0800
From:   Huaisheng Ye <>
Cc:,,,,,,,,, Huaisheng Ye <>
Subject: [RFC PATCH v2 4/4] Documentation/device-mapper: add optional parameter reinit

From: Huaisheng Ye <>

Add intro and usage guide for reinit.

Signed-off-by: Huaisheng Ye <>
 Documentation/device-mapper/writecache.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/device-mapper/writecache.txt b/Documentation/device-mapper/writecache.txt
index 01532b3..255c68c 100644
--- a/Documentation/device-mapper/writecache.txt
+++ b/Documentation/device-mapper/writecache.txt
@@ -45,6 +45,10 @@ Constructor parameters:
 		- some underlying devices perform better with fua, some
 		  with nofua. The user should test it
+	reinit		(by default off)
+		applicable only to persistent memory - use the REINIT flag
+		when the surper block has messy data, that would cause fn ctr
+		failed to work with invalid magic or version in the superblock
 1. error indicator - 0 if there was no error, otherwise error number

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