Kool Aid Served Daily

So I have a new daemon and I have it loaded:

# ./sped
10, 16, 64000, 1647890964l uid == 501
20, 32, 2000, 1647890964l uid == 1066
30, 64, 1000, 1647890964l uid == 0
40, 2, 2000, 1647890964l subnet ==  192.168.2.0/24

And I have a door upcall which starts in do_rfs4_op_mknod(). A door is an IPC mechanism used to communicate from the kernel to user land. Also, since the sped hands out policies for open creation, this should be a good point to call it from. Notice the foreshadowing invoked by the word "should" and remember that foreshadowing is the sign of good journalism (I think this is a quote from Bloom County?).

Okay, it didn't work - the sped is not being called. I can whip out kmdb and struggle through trying to see if the door upcall is invoked. But first, we should do a sanity check to see if do_rfs4_op_mknod() is even being called:

# dtrace -m nfssrv > /tmp/dtrace.log
dtrace: description 'nfssrv' matched 2262 probes
^C# grep do /tmp/dtrace.log
 0  51547              mds_do_lookup:entry
 0  51548             mds_do_lookup:return
 0  52741         do_rfs4_op_getattr:entry
 0  52742        do_rfs4_op_getattr:return
 0  52379          mds_findopenowner:entry
 0  52380         mds_findopenowner:return
 0  51593            mds_do_opennull:entry
 0  52127          do_rfs4_set_attrs:entry
 0  52128         do_rfs4_set_attrs:return
 0  51777             vop_fid_pseudo:entry
 0  51778            vop_fid_pseudo:return
 0  52641           do_41_deleg_hack:entry
 0  52642          do_41_deleg_hack:return
 0  51591                mds_do_open:entry
 0  51592               mds_do_open:return
 0  51594           mds_do_opennull:return
 0  52741         do_rfs4_op_getattr:entry
 0  52742        do_rfs4_op_getattr:return
 0  52741         do_rfs4_op_getattr:entry
 0  52742        do_rfs4_op_getattr:return
 1  52127          do_rfs4_set_attrs:entry
 1  52128         do_rfs4_set_attrs:return
 1  51547              mds_do_lookup:entry
 1  51548             mds_do_lookup:return
 1  52741         do_rfs4_op_getattr:entry
 1  52742        do_rfs4_op_getattr:return 

Remember, the rfs component of the function name means that is in the nfssrv module and not the nfs module. Also, note that you won't see "mds_" names in code drops from Nevada. You will need to download the pNFS tree over at: OpenSolaris Project: NFS version 4.1 pNFS

Okay, it was never called. So either dtrace is hosed or something is going wrong. What is being called? mds_createfile()

 0  51593            mds_do_opennull:entry
 0  51987             mds_createfile:entry
 0  52647            nfsauth4_access:entry
 0  52377             nfsauth_access:entry
 0  52378            nfsauth_access:return
 0  52648           nfsauth4_access:return
 0  52399       nfs4_ntov_table_init:entry
 0  52400      nfs4_ntov_table_init:return 

I'm off to build a new nfssrv to see if making my upcall from mds_createfile() works.