noreservation
-resize=
-
bsddf (*) Make 'df' act like BSD.
minixdf Make 'df' act like Minix.
grpquota
usrquota
+bh (*) ext3 associates buffer heads to data pages to
+nobh (a) cache disk block mapping information
+ (b) link pages into transaction to provide
+ ordering guarantees.
+ "bh" option forces use of buffer heads.
+ "nobh" option tries to avoid associating buffer
+ heads (supported only for "writeback" mode).
+
Specification
=============
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 (called a transaction). The
-journal supports the transactions start and stop, and in case of crash, the
-journal can replayed the transactions to put the partition back in a
-consistent state fast.
+The Journaling Block Device layer (JBD) isn't ext3 specific. It was designed
+to add journaling capabilities to a block device. The ext3 filesystem code
+will inform the JBD of modifications it is performing (called a transaction).
+The journal supports the transactions start and stop, and in case of a crash,
+the journal can replay the transactions to quickly put the partition back into
+a consistent state.
Handles represent a single atomic update to a filesystem. JBD can handle an
external journal on a block device.
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
-outperforms all others modes.
+outperforms all other modes.
Compatibility
-------------
tune2fs: create a ext3 journal on a ext2 partition with the -j flag.
mke2fs: create a ext3 partition with the -j flag.
debugfs: ext2 and ext3 file system debugger.
+ext2online: online (mounted) ext2 and ext3 filesystem resizer
References
<file:fs/jbd/>
programs: http://e2fsprogs.sourceforge.net/
+ http://ext2resize.sourceforge.net
useful links: http://www.zip.com.au/~akpm/linux/ext3/ext3-usage.html
http://www-106.ibm.com/developerworks/linux/library/l-fs7/