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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