Re: NILFS2, a log-structured filesystem

Very interesting.

> This is called "continuous snapshotting" - snapshots of modifications
> done in all the filesystem at any time are created automatically due
> to the log-structure design

What does this mean? Could you explain this better?

Klaus.


2009/6/15 Célio Cidral Junior <[email protected]>:
> I guess this new fs is perfect for prevayler journal.
>
> -----
> NILFS2 is a new filesystem which uses a log-structured design. What
> makes log-structured filesystems different is that they treat the
> whole disk as a consecutive list of blocks (called log). All the
> operations append data at the end of the log, they never rewrite
> blocks (except when there's no space left - in that case, new blocks
> are reclaimed from the start of the log). The advantage of this
> approach is that all modifications and creations are converted into
> sequential operations, which are faster. Crashes can't corrupt the
> filesystem. On mount, the filesystem detects the real end of the log,
> and continues working from that point.
>
> Another advantage of this approach is that the log offers a coherent
> historical view of all the operations done in the disk in the past.
> This is called "continuous snapshotting" - snapshots of modifications
> done in all the filesystem at any time are created automatically due
> to the log-structure design, with no requirement of intervention from
> an admin, and with the filesystem size as the only limit. NILFS2
> allows to access those snapshots and even mount them (on read-only
> mode).
>
> NILFS2 is under development. Code: fs/nilfs2/. Filesystem web page:
> www.nilfs.org
>
> Text taken from http://kernelnewbies.org/Linux_2_6_30
>
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