From: Karel Zak <kzak@redhat.com>
Date: Tue, 6 Jan 2009 13:39:58 +0000 (+0100)
Subject: mount: add info about semantics of read-only mount to mount.8
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=23422d303178c1d7a8687352c4c659a123202a44;p=util-linux

mount: add info about semantics of read-only mount to mount.8

Reported-by: Joachim Wagner <jwagner@computing.dcu.ie>
Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/mount/mount.8 b/mount/mount.8
index e40e75c9..a734c7b0 100644
--- a/mount/mount.8
+++ b/mount/mount.8
@@ -409,6 +409,12 @@ autofs\-based automounter.
 .B \-r
 Mount the file system read-only. A synonym is
 .BR "\-o ro" .
+
+Note that, depending on the filesystem type, state and kernel behavior, the
+system may still write to the device. For example, Ext3 will replay its journal
+if the filesystem is dirty. To prevent this kind of write access, you may want
+to map the device through a read-only loop device, see command
+.BR losetup (8).
 .TP
 .B \-w
 Mount the file system read/write. This is the default. A synonym is