Re: filesystem transactions API

Charles P. Wright
2005-04-26T17:24:59Z

On Tue, 2005-04-26 at 20:07 +0400, Artem B. Bityuckiy wrote:
> Charles P. Wright wrote:
> > Atomicity is difficult, because you have lots of caches each with their
> > own bits of state (e.g., the inode/dentry caches). Assuming your
> > transaction is committed that isn't so much of a problem, but once you
> > have on rollback you need to undo any changes to those caches.
> I guess if you do synchronization before unlocking all is OK. Roll-back
> means deleting partially written things and restore old things, then run
> fsyncs. Whys this may be not enough?
That would be fine for the on-disk image of the file system, but the in-
memory image also needs to be handled. Keeping track of all of these
objects and their changes is not a simple task.

Charles