linux-kernel - [patch] document ext3 a bit better

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Date:	Sun, 4 Jan 2009 23:34:33 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Theodore Tso <tytso@....edu>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org
Subject: [patch] document ext3 a bit better


ext3 has quite unexpected semantics or "ro" and defaults are usually
not what they are documented to be, due to mkfs override.

Signed-off-by: Pavel Machek <pavel@...e.cz>

diff --git a/Documentation/filesystems/ext3.txt b/Documentation/filesystems/ext3.txt
index 9dd2a3b..113db1f 100644
--- a/Documentation/filesystems/ext3.txt
+++ b/Documentation/filesystems/ext3.txt
@@ -14,6 +14,11 @@ Options
 When mounting an ext3 filesystem, the following option are accepted:
 (*) == default
 
+ro			Mount filesystem read only. Note that ext3 will replay
+			the journal (and thus write to the partition) even when
+			mounted "read only". "ro, noload" can be used to prevent
+			writes to the filesystem.
+
 journal=update		Update the ext3 file system's journal to the current
 			format.
 
@@ -27,7 +32,9 @@ journal_dev=devnum	When the external jou
 			identified through its new major/minor numbers encoded
 			in devnum.
 
-noload			Don't load the journal on mounting.
+noload			Don't load the journal on mounting. Note that this forces
+			mount of inconsistent filesystem, which can lead to
+			various problems.
 
 data=journal		All data are committed into the journal prior to being
 			written into the main file system.
@@ -95,6 +102,8 @@ debug			Extra debugging information is s
 errors=remount-ro(*)	Remount the filesystem read-only on an error.
 errors=continue		Keep going on a filesystem error.
 errors=panic		Panic and halt the machine if an error occurs.
+			(Note that default is overriden by superblock
+			setting on most systems).
 
 data_err=ignore(*)	Just print an error message if an error occurs
 			in a file data buffer in ordered mode.

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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