a few questions about ext3 journal
Jérôme Petazzoni
jp at enix.org
Thu Mar 10 11:10:44 UTC 2005
A few wild ideas/questions :
1) Is there a way to check the size of the journal of an ext3 filesystem ?
I mean - the actually used size ; not the total size of the journal.
2) Would it be difficult to implement "freeze" of ext3 filesystem - that
is, blocking all I/O to the filesystem until it's "unfrozen" (XFS can do
that), for two purposes :
A/ allowing "freezing" in a clean state, to allow clean snapshotting
B/ allowing "freezing" while moving a SCSI disk or a network-connected
disk without umounting filesystem
A/ would require some work at the FS layer I guess, but B/ might be
doable at the devicemapper layer or something like that.
3) Is it possible to allow data to stay in the journal for a very long
time ?
Rationale : for laptops with a lot of memory and some solid-state
memory, this would allow to shutdown the hard disk (if all read data is
in the cache, and all written data goes to the log on the solid-state disk).
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