On Wed, Jul 29, 2009 at 05:34:53PM -0700, Roman V Shaposhnik wrote: > On Wed, 2009-07-29 at 15:06 +0300, Andriy Gapon wrote: > > What do you think about the following feature? > > > > "Subdirectory is automatically a new filesystem" property - an > > administrator turns > > on this magic property of a filesystem, after that every mkdir *in the > > root* of > > that filesystem creates a new filesystem. The new filesystems have > > default/inherited properties except for the magic property which is off. > > > > Right now I see this as being mostly useful for /home. Main benefit in this > > case > > is that various user administration tools can work unmodified and do the > > right > > thing when an administrator wants a policy of a separate fs per user > > But I am sure that there could be other interesting uses for this. > > This feature request touches upon a very generic observation that my > group made a long time ago: ZFS is a wonderful filesystem, the only > trouble is that (almost) all the cool features have to be asked for > using non-filesystem (POSIX) APIs. Basically everytime you have > to do anything with ZFS you have to do it on a host where ZFS runs. > > The sole exception from this rule is .zfs subdirectory that lets you > have access to snapshots without explicit calls to zfs(1M). > > Basically .zfs subdirectory is your POSIX FS way to request two bits > of ZFS functionality. In general, however, we all want more. > > On the read-only front: wouldn't it be cool to *not* run zfs sends > explicitly but have: > .zfs/send/<snap name> > .zfs/sendr/<from-snap-name>-<to-snap-name> > give you the same data automagically? > > On the read-write front: wouldn't it be cool to be able to snapshot > things by: > $ mkdir .zfs/snapshot/<snap-name> > ?
Are you sure this doesn't work on Solaris/OpenSolaris? From looking at the code you should be able to do exactly that as well as destroy snapshot by rmdir'ing this entry. -- Pawel Jakub Dawidek http://www.wheel.pl p...@freebsd.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am!
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