linux-kernel - util-linux: Add explanation for new mount options flushonfsync and noflushonfsync to mount(8) man page

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Message-Id: <1234435081.15433.10.camel@sebastian.kern.oss.ntt.co.jp>
Date:	Thu, 12 Feb 2009 19:38:01 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	Jan Kara <jack@...e.cz>
Cc:	Theodore Tso <tytso@....EDU>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>, sandeen@...hat.com,
	fernando@....ac.jp
Subject: util-linux: Add explanation for new mount options flushonfsync and
	noflushonfsync to mount(8) man page

Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
---

diff -urp mount-orig/mount.8 mount/mount.8
--- mount-orig/mount.8	2009-01-29 15:50:50.000000000 +0900
+++ mount/mount.8	2009-01-29 15:40:39.000000000 +0900
@@ -649,6 +649,18 @@ current modify or change time. (Similar 
 mutt or other applications that need to know if a file has been read
 since the last time it was modified.)
 .TP
+.B flushonfsync
+Force block device flush on fsync()/fdatasync(). When using storage equipped
+with write caches that can be explicitly flushed by the kernel, this guarantees
+that the data/metadata actually made it to the physical media after invoking
+the respective file data/metadata synchronization system call.
+.TP
+.B noflushonfsync
+Do not force a flush of the backing device's write cache when a file
+data/metadata synchronization system call is executed. Unless the device is
+equipped with a battery-backup write cache, this behavior can cause data loss
+and/or file system corruption in the event of a power failure.
+.TP
 .B noauto
 Can only be mounted explicitly (i.e., the
 .B \-a


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