Hi Jack! On Thu, 4 Feb 2010, Jack Culpepper wrote: > I am trying to understand the loadable class stuff, which seems really > cool. I see the objclass directory and cls_crypto.cc seems to be a > good example that I could copy and change around. > > Does the code in cls_crypto.cc get linked into code at the storage node?
Yeah, the storage daemon will do a dlopen() to link in the .so. > Is it run in userspace? Yep. > I see an exec() in librados.cc, and then testrados.c seems to be the > place where I would add a driver program to call whatever class I add? Right. > You link to openssl for the crypto. Is it ok to link to other, > possibly huge libraries? Yeah, so long as you keep in mind it'll get loaded into all instances of the cosd storage daemon. > On the test system, will there be a special place to store the > libraries my class needs? The system manages the library of loaded classes internally. You load them into the system with something like $ ./ceph class add crypto 1 x86-64 -i libcls_crypto.so where 1 is the version, x86-64 is the arch. (Note that it may take a few seconds for the classes to propagate to all nodes.) If you have multiple versions loaded, you need to explicitly activate the version you want. See $ ./ceph class list $ ./ceph class activate crypto 2 etc. If you load the libcls_acl.so and libcls_crypto.so classes, testradospp will test them. It's pretty rough around the edges (hasn't seen a lot of testing). We're definitely interested in hearing how it works for you (in terms of the api and everything else)! sage ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ Ceph-devel mailing list Ceph-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ceph-devel
