On Thu, 2013-10-24 at 11:23 -0400, Jeff Layton wrote: +AD4- On Thu, 24 Oct 2013 11:16:10 -0400 +AD4- Simo Sorce +ADw-simo+AEA-redhat.com+AD4- wrote: +AD4- +AD4- +AD4- On Thu, 2013-10-24 at 15:11 +-0000, Myklebust, Trond wrote: +AD4- +AD4- +AD4- On Thu, 2013-10-24 at 11:07 -0400, Simo Sorce wrote: +AD4- +AD4- +AD4- +AD4- +AD4- +AD4- +AD4- Because the filesystem can do that when multiple applications are +AD4- +AD4- +AD4- +AD4- involved without having to change them all to talk to each other and +AD4- +AD4- +AD4- +AD4- invent custom protocol all the time just to keep some additional +AD4- +AD4- +AD4- +AD4- metadata associated to a file.. +AD4- +AD4- +AD4- +AD4- +AD4- +AD4- +AD4- It's still a custom protocol. The applications need to agree on a data +AD4- +AD4- +AD4- format and store it somewhere. The portable way to do this is to write +AD4- +AD4- +AD4- an application library that they can link to. +AD4- +AD4- +AD4- +AD4- Perhaps I was unclear, you are never going to see that custom library +AD4- +AD4- linked into the 'mv' command. +AD4- +AD4- +AD4- +AD4- So your approach makes little sense if the object is to maintain data +AD4- +AD4- coherent when people need to handle files from random applications and +AD4- +AD4- scripts and general system maintenance. +AD4- +AD4- +AD4- +AD4- The data may be relevant only to a specific application. +AD4- +AD4- +AD4- +AD4- I am not saying you +ACo-have+ACo- to implement xattrs support, just saying that +AD4- +AD4- it is not a mere 'applications should synchronize data themselves' +AD4- +AD4- problem. +AD4- +AD4- +AD4- +AD4- I think the real solution if people need this is to lead an effort to +AD4- put xattrs into the spec. I think there is still time to get new +AD4- features into v4.3 if someone wants to champion it... +AD4- How would that help? Witness Oracle's success with named attributes, which are +AF8-also+AF8- a non-standard filesystem feature that was hastily pushed into the NFSv4 spec. If you really need this for use by applications (as opposed to by sysadmins - see labeled NFS), then get the functionality into POSIX first, then add it to the NFS spec. -- Trond Myklebust Linux NFS client maintainer NetApp Trond.Myklebust+AEA-netapp.com www.netapp.com -- 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
