Merge tag 'nfsd-4.15' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:
 "Lots of good bugfixes, including:

   -  fix a number of races in the NFSv4+ state code

   -  fix some shutdown crashes in multiple-network-namespace cases

   -  relax our 4.1 session limits; if you've an artificially low limit
      to the number of 4.1 clients that can mount simultaneously, try
      upgrading"

* tag 'nfsd-4.15' of git://linux-nfs.org/~bfields/linux: (22 commits)
  SUNRPC: Improve ordering of transport processing
  nfsd: deal with revoked delegations appropriately
  svcrdma: Enqueue after setting XPT_CLOSE in completion handlers
  nfsd: use nfs->ns.inum as net ID
  rpc: remove some BUG()s
  svcrdma: Preserve CB send buffer across retransmits
  nfds: avoid gettimeofday for nfssvc_boot time
  fs, nfsd: convert nfs4_file.fi_ref from atomic_t to refcount_t
  fs, nfsd: convert nfs4_cntl_odstate.co_odcount from atomic_t to refcount_t
  fs, nfsd: convert nfs4_stid.sc_count from atomic_t to refcount_t
  lockd: double unregister of inetaddr notifiers
  nfsd4: catch some false session retries
  nfsd4: fix cached replies to solo SEQUENCE compounds
  sunrcp: make function _svc_create_xprt static
  SUNRPC: Fix tracepoint storage issues with svc_recv and svc_rqst_status
  nfsd: use ARRAY_SIZE
  nfsd: give out fewer session slots as limit approaches
  nfsd: increase DRC cache limit
  nfsd: remove unnecessary nofilehandle checks
  nfs_common: convert int to bool
  ...

Author: torvalds

fs/lockd/svc.c

@@ -369,6 +369,7 @@ static int lockd_start_svc(struct svc_serv *serv)
 		printk(KERN_WARNING
 			"lockd_up: svc_rqst allocation failed, error=%d\n",
 			error);
+		lockd_unregister_notifiers();
 		goto out_rqst;
 	}
 
@@ -459,13 +460,16 @@ int lockd_up(struct net *net)
 	}
 
 	error = lockd_up_net(serv, net);
-	if (error < 0)
-		goto err_net;
+	if (error < 0) {
+		lockd_unregister_notifiers();
+		goto err_put;
+	}
 
 	error = lockd_start_svc(serv);
-	if (error < 0)
-		goto err_start;
-
+	if (error < 0) {
+		lockd_down_net(serv, net);
+		goto err_put;
+	}
 	nlmsvc_users++;
 	/*
 	 * Note: svc_serv structures have an initial use count of 1,
@@ -476,12 +480,6 @@ int lockd_up(struct net *net)
 err_create:
 	mutex_unlock(&nlmsvc_mutex);
 	return error;
-
-err_start:
-	lockd_down_net(serv, net);
-err_net:
-	lockd_unregister_notifiers();
-	goto err_put;
 }
 EXPORT_SYMBOL_GPL(lockd_up);
 

fs/nfs_common/grace.c

@@ -55,14 +55,7 @@ locks_end_grace(struct lock_manager *lm)
 }
 EXPORT_SYMBOL_GPL(locks_end_grace);
 
-/**
- * locks_in_grace
- *
- * Lock managers call this function to determine when it is OK for them
- * to answer ordinary lock requests, and when they should accept only
- * lock reclaims.
- */
-int
+static bool
 __state_in_grace(struct net *net, bool open)
 {
 	struct list_head *grace_list = net_generic(net, grace_net_id);
@@ -78,15 +71,22 @@ __state_in_grace(struct net *net, bool open)
 	return false;
 }
 
-int locks_in_grace(struct net *net)
+/**
+ * locks_in_grace
+ *
+ * Lock managers call this function to determine when it is OK for them
+ * to answer ordinary lock requests, and when they should accept only
+ * lock reclaims.
+ */
+bool locks_in_grace(struct net *net)
 {
-	return __state_in_grace(net, 0);
+	return __state_in_grace(net, false);
 }
 EXPORT_SYMBOL_GPL(locks_in_grace);
 
-int opens_in_grace(struct net *net)
+bool opens_in_grace(struct net *net)
 {
-	return __state_in_grace(net, 1);
+	return __state_in_grace(net, true);
 }
 EXPORT_SYMBOL_GPL(opens_in_grace);
 

fs/nfsd/fault_inject.c

@@ -12,6 +12,7 @@
 #include <linux/nsproxy.h>
 #include <linux/sunrpc/addr.h>
 #include <linux/uaccess.h>
+#include <linux/kernel.h>
 
 #include "state.h"
 #include "netns.h"
@@ -126,8 +127,6 @@ static struct nfsd_fault_inject_op inject_ops[] = {
 	},
 };
 
-#define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op))
-
 int nfsd_fault_inject_init(void)
 {
 	unsigned int i;
@@ -138,7 +137,7 @@ int nfsd_fault_inject_init(void)
 	if (!debug_dir)
 		goto fail;
 
-	for (i = 0; i < NUM_INJECT_OPS; i++) {
+	for (i = 0; i < ARRAY_SIZE(inject_ops); i++) {
 		op = &inject_ops[i];
 		if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd))
 			goto fail;

fs/nfsd/netns.h

@@ -107,7 +107,7 @@ struct nfsd_net {
 	bool lockd_up;
 
 	/* Time of server startup */
-	struct timeval nfssvc_boot;
+	struct timespec64 nfssvc_boot;
 
 	/*
 	 * Max number of connections this nfsd container will allow. Defaults

fs/nfsd/nfs3xdr.c

@@ -748,8 +748,9 @@ nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
 	if (resp->status == 0) {
 		*p++ = htonl(resp->count);
 		*p++ = htonl(resp->committed);
-		*p++ = htonl(nn->nfssvc_boot.tv_sec);
-		*p++ = htonl(nn->nfssvc_boot.tv_usec);
+		/* unique identifier, y2038 overflow can be ignored */
+		*p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
+		*p++ = htonl(nn->nfssvc_boot.tv_nsec);
 	}
 	return xdr_ressize_check(rqstp, p);
 }
@@ -1119,8 +1120,9 @@ nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
 	p = encode_wcc_data(rqstp, p, &resp->fh);
 	/* Write verifier */
 	if (resp->status == 0) {
-		*p++ = htonl(nn->nfssvc_boot.tv_sec);
-		*p++ = htonl(nn->nfssvc_boot.tv_usec);
+		/* unique identifier, y2038 overflow can be ignored */
+		*p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
+		*p++ = htonl(nn->nfssvc_boot.tv_nsec);
 	}
 	return xdr_ressize_check(rqstp, p);
 }

fs/nfsd/nfs4layouts.c

@@ -336,7 +336,7 @@ nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
 
 	trace_layout_recall(&ls->ls_stid.sc_stateid);
 
-	atomic_inc(&ls->ls_stid.sc_count);
+	refcount_inc(&ls->ls_stid.sc_count);
 	nfsd4_run_cb(&ls->ls_recall);
 
 out_unlock:
@@ -441,7 +441,7 @@ nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
 			goto done;
 	}
 
-	atomic_inc(&ls->ls_stid.sc_count);
+	refcount_inc(&ls->ls_stid.sc_count);
 	list_add_tail(&new->lo_perstate, &ls->ls_layouts);
 	new = NULL;
 done:

fs/nfsd/nfs4proc.c

@@ -485,9 +485,6 @@ static __be32
 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	    union nfsd4_op_u *u)
 {
-	if (!cstate->current_fh.fh_dentry)
-		return nfserr_nofilehandle;
-
 	u->getfh = &cstate->current_fh;
 	return nfs_ok;
 }
@@ -535,9 +532,6 @@ static __be32
 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	     union nfsd4_op_u *u)
 {
-	if (!cstate->current_fh.fh_dentry)
-		return nfserr_nofilehandle;
-
 	fh_dup2(&cstate->save_fh, &cstate->current_fh);
 	if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 		memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
@@ -570,10 +564,11 @@ static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 
 	/*
 	 * This is opaque to client, so no need to byte-swap. Use
-	 * __force to keep sparse happy
+	 * __force to keep sparse happy. y2038 time_t overflow is
+	 * irrelevant in this usage.
 	 */
 	verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
-	verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
+	verf[1] = (__force __be32)nn->nfssvc_boot.tv_nsec;
 	memcpy(verifier->data, verf, sizeof(verifier->data));
 }
 
@@ -703,10 +698,8 @@ nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	   union nfsd4_op_u *u)
 {
 	struct nfsd4_link *link = &u->link;
-	__be32 status = nfserr_nofilehandle;
+	__be32 status;
 
-	if (!cstate->save_fh.fh_dentry)
-		return status;
 	status = nfsd_link(rqstp, &cstate->current_fh,
 			   link->li_name, link->li_namelen, &cstate->save_fh);
 	if (!status)
@@ -850,10 +843,8 @@ nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	     union nfsd4_op_u *u)
 {
 	struct nfsd4_rename *rename = &u->rename;
-	__be32 status = nfserr_nofilehandle;
+	__be32 status;
 
-	if (!cstate->save_fh.fh_dentry)
-		return status;
 	if (opens_in_grace(SVC_NET(rqstp)) &&
 		!(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 		return nfserr_grace;