The file names are cached and if there is some problem on the client then the cache might be missing the names. The cache is populated by VOP_LOOKUP() but if vnode_t v_path is NULL then VOP_LOOKUP() was never run which can only happen when there is some issue on the client like possibly a reboot and the vnode is obtained from VFS_VGET().
Try umount/mount of the filesystem on the client and see if it refreshes the cache. - Kyle Hailey http://dboptimizer.com On Mon, Feb 28, 2011 at 1:26 AM, wessels <wessels...@gmail.com> wrote: > Hi, > > sorry to post this again but my first post didn't make it to the mailing > list. > > I'm trying to monitor a file, via the iopattern script from the DTrace > toolkit, which resides on a ZFS filesystem and is being modified by a > remote NFS client. I tried this on b104 and b125 nothing more recent. > Plain iopattern without options shows i/o counters as output but when > I supply the filename via the -f parameter all fields remain zero. > I also tried the following oneliners below: > # ./nfsv3fileio.d > Tracing... Hit Ctrl-C to end. > ^C > > Rbytes Wbytes Pathname > 41631744 41421266 <unknown> > > # dtrace -n 'nfsv3:::op-read-start,nfsv3:::op-write-start { > @[probefunc,args[1]->noi_curpath] =count(); }' > dtrace: description 'nfsv3:::op-read-start,nfsv3:::op-write-start ' > matched 2 probes > ^C > > rfs3_read <unknown> 867 > rfs3_write <unknown> 3470 > # dtrace -n 'fsinfo:::read,fsinfo:::write { > @[probefunc,args[0]->fi_pathname] =count(); }' dtrace: description > 'fsinfo:::read,fsinfo:::write ' matched 2 probes > ^C > > fop_read /etc/default/nfs 2 > fop_read /etc/resolv.conf 6 > fop_read <unknown> 155 > fop_write <unknown> 619 > > Any ideas why this happens, that's the <unknown>? Yes, the i/o are > detected but on which file? > > Thanks, > > Frederik > _______________________________________________ > dtrace-discuss mailing list > dtrace-discuss@opensolaris.org > -- - Kyle O: +1.415.341.3430 F: +1.650.494.1676 275 Middlefield Road, Suite 50 Menlo Park, CA 94025 http://www.delphix.com
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