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發信人"Samuel J. Greear" <sjg@evilcode.net>,

看板DFBSD_kernel

標題Re: [GSoC] HAMMER compression and new unionfs

發信站(null) (Mon Mar 28 18:09:02 2011)

轉信站ptt!crater_reader.dragonflybsd.org!crater.dragonflybsd.org!127.0.0.1.M

--000e0ce0f0407eac50049f8d2979 Content-Type: text/plain; charset=ISO-8859-1 On Mar 28, 2011 10:02 AM, "Alex Hornung" <ahornung@gmail.com> wrote: > > On 28/03/11 16:48, Naohiro Aota wrote: > > about implementing a new unionfs: > > > >> The current unionfs is completely broken as it relies on the whiteout > >> VFS technique which is not supported by HAMMER. > > > > - Then main work would be to implement whiteout feature on HAMMER? > > - or rewrite unionfs code not to depend on whiteout technique? > > I've now changed the text on the projects page to reflect that we don't > want a new unionfs using whiteout. So the aim of this project is to > develop a unionfs from scratch avoiding techniques which require messing > with other filesystems. > > > and also: > > > > - Are there some docs (or some source code file) to help me understand > > DragonFly VFS and HAMMER internal? > > - Are there some detailed guides about these ideas? > > About the VFS you can refer to the book "Design & Implementation of > FreeBSD". Things have changed, but it gives a good general perspective > of how things work. The namecache, most interesting part for unionfs, > has no real documentation, only inline with the code. > > Regards, > Alex Hornung A great bullet point for any project would be "fully document related and undocumented feature x with a new manpage." Sam --000e0ce0f0407eac50049f8d2979 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Mar 28, 2011 10:02 AM, "Alex Hornung" <<a href=3D"mailto= :ahornung@gmail.com">ahornung@gmail.com</a>> wrote: > > On 28/03/11 16:48, Naohiro Aota wrote: > > about implementing a new unionfs: > > > >> The current unionfs is completely broken as it relies on the = whiteout > >> VFS technique which is not supported by HAMMER. > > > > - Then main work would be to implement whiteout feature on HAMMER= ? > > - or rewrite unionfs code not to depend on whiteout technique?<br= > > > I've now changed the text on the projects page to reflect that we = don't > want a new unionfs using whiteout. So the aim of this project is to<br= > > develop a unionfs from scratch avoiding techniques which require messi= ng > with other filesystems. > > > and also: > > > > - Are there some docs (or some source code file) to help me under= stand > > =A0 DragonFly VFS and HAMMER internal? > > - Are there some detailed guides about these ideas? > > About the VFS you can refer to the book "Design & Implementat= ion of > FreeBSD". Things have changed, but it gives a good general perspe= ctive > of how things work. The namecache, most interesting part for unionfs,<= br> > has no real documentation, only inline with the code. > > Regards, > Alex Hornung A great bullet point for any project would be "fully document relat= ed and undocumented feature x with a new manpage." Sam --000e0ce0f0407eac50049f8d2979--