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+
+Ext3 Filesystem
+===============
+
+ext3 was originally released in September 1999. Written by Stephen Tweedie
+for 2.2 branch, and ported to 2.4 kernels by Peter Braam, Andreas Dilger, 
+Andrew Morton, Alexander Viro, Ted Ts'o and Stephen Tweedie.
+
+ext3 is ext2 filesystem enhanced with journalling capabilities. 
+
+Options
+=======
+
+When mounting an ext3 filesystem, the following option are accepted:
+(*) == default
+
+jounal=update		Update the ext3 file system's journal to the 
+			current format.
+
+journal=inum		When a journal already exists, this option is 
+			ignored. Otherwise, it specifies the number of
+			the inode which will represent the ext3 file
+			system's journal file.
+
+noload			Don't load the journal on mounting.
+
+data=journal		All data are committed into the journal prior
+			to being written into the main file system.
+
+data=ordered	(*)	All data are forced directly out to the main file
+			system prior to its metadata being committed to
+			the journal.
+
+data=writeback		Data ordering is not preserved, data may be
+			written into the main file system after its
+			metadata has been committed to the journal.
+
+commit=nrsec	(*)	Ext3 can be told to sync all its data and metadata
+			every 'nrsec' seconds. The default value is 5 seconds.
+			This means that if you lose your power, you will lose,
+			as much, the latest 5 seconds of work (your filesystem
+			will not be damaged though, thanks to journaling). This
+			default value (or any low value) will hurt performance,
+			but it's good for data-safety. Setting it to 0 will
+			have the same effect than leaving the default 5 sec.
+			Setting it to very large values will improve
+			performance.
+
+barrier=1		This enables/disables barriers. barrier=0 disables it,
+			barrier=1 enables it.
+
+orlov		(*)	This enables the new Orlov block allocator. It's enabled
+			by default.
+
+oldalloc		This disables the Orlov block allocator and enables the
+			old block allocator. Orlov should have better performance,
+			we'd like to get some feedback if it's the contrary for
+			you.
+
+user_xattr	(*)	Enables POSIX Extended Attributes. It's enabled by
+			default, however you need to confifure its support
+			(CONFIG_EXT3_FS_XATTR). This is neccesary if you want
+			to use POSIX Acces Control Lists support. You can visit
+			http://acl.bestbits.at to know more about POSIX Extended
+			attributes.
+
+nouser_xattr		Disables POSIX Extended Attributes.
+
+acl		(*)	Enables POSIX Access Control Lists support. This is
+			enabled by default, however you need to configure
+			its support (CONFIG_EXT3_FS_POSIX_ACL). If you want
+			to know more about ACLs visit http://acl.bestbits.at
+
+noacl			This option disables POSIX Access Control List support.
+
+reservation
+
+noreservation
+
+resize=
+
+bsddf 		(*)	Make 'df' act like BSD.
+minixdf			Make 'df' act like Minix.
+
+check=none		Don't do extra checking of bitmaps on mount.
+nocheck		
+
+debug			Extra debugging information is sent to syslog.
+
+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.
+
+grpid			Give objects the same group ID as their creator.
+bsdgroups		
+
+nogrpid		(*)	New objects have the group ID of their creator.
+sysvgroups
+
+resgid=n		The group ID which may use the reserved blocks.
+
+resuid=n		The user ID which may use the reserved blocks.
+
+sb=n			Use alternate superblock at this location.
+
+quota			Quota options are currently silently ignored.
+noquota			(see fs/ext3/super.c, line 594)
+grpquota
+usrquota
+
+
+Specification
+=============
+ext3 shares all disk implementation with ext2 filesystem, and add
+transactions capabilities to ext2.  Journaling is done by the
+Journaling block device layer.
+
+Journaling Block Device layer
+-----------------------------
+The Journaling Block Device layer (JBD) isn't ext3 specific.  It was
+design to add journaling capabilities on a block device.  The ext3
+filesystem code will inform the JBD of modifications it is performing
+(Call a transaction).  the journal support the transactions start and
+stop, and in case of crash, the journal can replayed the transactions
+to put the partition on a consistent state fastly.
+
+handles represent a single atomic update to a filesystem.  JBD can
+handle external journal on a block device.
+
+Data Mode
+---------
+There's 3 different data modes:
+
+* writeback mode
+In data=writeback mode, ext3 does not journal data at all.  This mode
+provides a similar level of journaling as XFS, JFS, and ReiserFS in its
+default mode - metadata journaling.  A crash+recovery can cause
+incorrect data to appear in files which were written shortly before the
+crash.  This mode will typically provide the best ext3 performance.
+
+* ordered mode
+In data=ordered mode, ext3 only officially journals metadata, but it
+logically groups metadata and data blocks into a single unit called a
+transaction.  When it's time to write the new metadata out to disk, the
+associated data blocks are written first.  In general, this mode
+perform slightly slower than writeback but significantly faster than
+journal mode.
+
+* journal mode
+data=journal mode provides full data and metadata journaling.  All new
+data is written to the journal first, and then to its final location. 
+In the event of a crash, the journal can be replayed, bringing both
+data and metadata into a consistent state.  This mode is the slowest
+except when data needs to be read from and written to disk at the same
+time where it outperform all others mode.
+
+Compatibility
+-------------
+
+Ext2 partitions can be easily convert to ext3, with `tune2fs -j <dev>`.
+Ext3 is fully compatible with Ext2.  Ext3 partitions can easily be
+mounted as Ext2.
+
+External Tools
+==============
+see manual pages to know more.
+
+tune2fs: 	create a ext3 journal on a ext2 partition with the -j flags
+mke2fs: 	create a ext3 partition with the -j flags
+debugfs: 	ext2 and ext3 file system debugger
+
+References
+==========
+
+kernel source:	file:/usr/src/linux/fs/ext3
+		file:/usr/src/linux/fs/jbd
+
+programs: 	http://e2fsprogs.sourceforge.net
+
+useful link:
+		http://www.zip.com.au/~akpm/linux/ext3/ext3-usage.html
+		http://www-106.ibm.com/developerworks/linux/library/l-fs7/
+		http://www-106.ibm.com/developerworks/linux/library/l-fs8/