[PATCH] nfsd4: stop overusing RECLAIM_BAD

A misreading of the spec lead us to convert all errors on open and lock
reclaims to RECLAIM_BAD.  This causes problems--for example, a reboot within
the grace period could lead to reclaims with stale stateid's, and we'd like to
return STALE errors in those cases.

What rfc3530 actually says about RECLAIM_BAD: "The reclaim provided by the
client does not match any of the server's state consistency checks and is
bad." I'm assuming that "state consistency checks" refers to checks for
consistency with the state recorded to stable storage, and that the error
should be reserved for that case.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfsd/nfs4state.c

@@ -1531,8 +1531,6 @@ renew:
 	status = nfs_ok;
 	renew_client(sop->so_client);
 out:
-	if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
-		status = nfserr_reclaim_bad;
 	return status;
 }
 
@@ -1688,17 +1686,11 @@ nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_sta
 
 /* decrement seqid on successful reclaim, it will be bumped in encode_open */
 static void
-nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
+nfs4_set_claim_prev(struct nfsd4_open *open)
 {
-	if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
-		if (*status)
-			*status = nfserr_reclaim_bad;
-		else {
-			open->op_stateowner->so_confirmed = 1;
-			open->op_stateowner->so_client->cl_firststate = 1;
-			open->op_stateowner->so_seqid--;
-		}
-	}
+	open->op_stateowner->so_confirmed = 1;
+	open->op_stateowner->so_client->cl_firststate = 1;
+	open->op_stateowner->so_seqid--;
 }
 
 /*
@@ -1863,8 +1855,8 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
 out:
 	if (fp)
 		put_nfs4_file(fp);
-	/* CLAIM_PREVIOUS has different error returns */
-	nfs4_set_claim_prev(open, &status);
+	if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
+		nfs4_set_claim_prev(open);
 	/*
 	* To finish the open response, we just need to set the rflags.
 	*/
@@ -2738,11 +2730,8 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
 		                        CHECK_FH | OPEN_STATE,
 		                        &open_sop, &open_stp,
 					&lock->v.new.clientid);
-		if (status) {
-			if (lock->lk_reclaim)
-				status = nfserr_reclaim_bad;
+		if (status)
 			goto out;
-		}
 		/* create lockowner and lock stateid */
 		fp = open_stp->st_file;
 		strhashval = lock_ownerstr_hashval(fp->fi_inode,