( This really should be on linux-fsdevel@vger.rutgers.edu list )
On Tue, Jul 18, 2000 at 03:40:30PM +0200, Rask Ingemann Lambertsen wrote:
> On 06-Jul-00 20:32:35, Theodore Y. Ts'o wrote:
> >
> >Multics operating system was able to run its filesystem recovery tool
> >while the filesystem was online.
>
> A defragmenter that works while the fs is online would be nice too.
> SmartFileSystem on the Amiga has one, and the fs remains fully functional
> while the defragmenter runs. You only notice a performance decrease.
Just to give people some ideas regarding it..
- VMS as had several defragmenter programs running in parallel
with live system at least as early as 1986.
- Doing orderly locking of critical datablocks might solve the issue;
"just" some supporting IOCTLs so that suitably privileged process
can do inode/superblock/bitmap-block/whatnot read/modify/write
operations within the filesystem.
- Doing those lockings via a fd (e.g. root directory fd of the
mounted filesystem) would allow file closing (program crash,
or whatever reason) to clean up afterwards.
> Regards,
> | Rask Ingemann Lambertsen | E-mail: mailto:rask@kampsax.k-net.dk |
/Matti Aarnio <matti.aarnio@sonera.fi>
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