On Mon, 2010-03-29 at 20:03 +0100, Al Viro wrote: > On Mon, Mar 29, 2010 at 07:36:45PM +0100, Daniel J Blueman wrote: > > Hi Trond, > > > > When open fails and should return EPERM [1], instead we see an oops > > [2]. I see this on 2.6.34-rc1 and -rc2 mainline; NFS4 server is > > mainline 2.6.33.1. > > > > Let me know if you can't reproduce it and I'll provide some analysis > > from this end. > > Joy... ERR_PTR(-EPERM) in nd.intent.file, and whoever had called > lookup_instantiate_filp() hadn't bothered to check the return value. > > OK, I think I see what's going on. Replace > lookup_instantiate_filp(nd, (struct dentry *)state, NULL); > return 1; > with > lookup_instantiate_filp(nd, (struct dentry *)state, NULL); > return state; > in fs/nfs/nfs4proc.c:nfs4_open_revalidate() and see if everything works > properly (or just lose the lookup_instantiate_filp() in there and simply > return state). > So this raises a point. Originally, the d_revalidate() call was required to return a boolean 0 or 1. Nowadays it allows the filesystem to return an error value instead. Should we therefore rewrite the NFS implementation to propagate errors like ESTALE (when it means the parent directory is gone), EACCES, EPERM and EIO instead of the current behaviour of just dropping the dentry and hence forcing a lookup? Trond -- 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
