----- Original Message ----- > From: "J. Bruce Fields" <bfields@xxxxxxxxxxxx> > To: "Trond Myklebust" <trondmy@xxxxxxxxxxxxxxx> > Cc: "Christoph Hellwig" <hch@xxxxxx>, "Jeff Layton" <jlayton@xxxxxxxxxxxxxxx>, "linux-nfs" <linux-nfs@xxxxxxxxxxxxxxx>, > "schumaker anna" <schumaker.anna@xxxxxxxxx> > Sent: Friday, June 30, 2017 7:38:18 PM > Subject: Re: open by handle support for NFS V2 > On Fri, Jun 30, 2017 at 05:00:59PM +0000, Trond Myklebust wrote: >> The main use case for open by filehandle was (and still should be) the >> promise of being able to do the sort of tricks you normally associate >> with object storage on a standard filesystem. >> >> Imagine that you are trying to build an application for indexing and >> searching the data on your storage. You basically want to trawl through >> the filesystem on a regular basis and build up a database of key words >> and other metadata to tell you what is in the files. For that kind of >> application, the namespace is a real PITA to deal with, because files >> get renamed, moved and deleted all the time; so if you can store >> something that is independent of the namespace and that will give you >> access to the file contents, then why wouldn't you do so? Normally, >> applications like that use the inode number, but you can't open a file >> by inode number, and you have the same problems with inode number reuse >> that a NFS server has. >> >> That's the sort of thing I'd think we want to allow through open by >> filehandle, and I see no reason why NFS should be excluded from that >> type of application. > > Thanks, that makes sense. > > We've had open_by_handle support for most filesystems since 2011, is > there evidence of anyone doing this? I am pretty sure that nfs-ganesha is using this in one the backend implementations. Tigran. > > --b. > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
