nfsd: use 64-bit seconds fields in nfsd v4 code

After commit 95582b00 "vfs: change inode times to use struct
timespec64" there are spots in the NFSv4 decoding where we decode the
protocol into a struct timeval and then convert that into a timeval64.

That's unnecesary in the NFSv4 case since the on-the-wire protocol also
uses 64-bit values.  So just fix up our code to use timeval64 everywhere.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/blocklayout.c

@@ -121,15 +121,13 @@ nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp,
 {
 	loff_t new_size = lcp->lc_last_wr + 1;
 	struct iattr iattr = { .ia_valid = 0 };
-	struct timespec ts;
 	int error;
 
-	ts = timespec64_to_timespec(inode->i_mtime);
 	if (lcp->lc_mtime.tv_nsec == UTIME_NOW ||
-	    timespec_compare(&lcp->lc_mtime, &ts) < 0)
-		lcp->lc_mtime = timespec64_to_timespec(current_time(inode));
+	    timespec64_compare(&lcp->lc_mtime, &inode->i_mtime) < 0)
+		lcp->lc_mtime = current_time(inode);
 	iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME;
-	iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = timespec_to_timespec64(lcp->lc_mtime);
+	iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime;
 
 	if (new_size > i_size_read(inode)) {
 		iattr.ia_valid |= ATTR_SIZE;

fs/nfsd/nfs4xdr.c

@@ -274,14 +274,12 @@ static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
  * we ignore all 32 bits of 'nseconds'.
  */
 static __be32
-nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
+nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
 {
 	DECODE_HEAD;
-	u64 sec;
 
 	READ_BUF(12);
-	p = xdr_decode_hyper(p, &sec);
-	tv->tv_sec = sec;
+	p = xdr_decode_hyper(p, &tv->tv_sec);
 	tv->tv_nsec = be32_to_cpup(p++);
 	if (tv->tv_nsec >= (u32)1000000000)
 		return nfserr_inval;
@@ -320,7 +318,6 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 		   struct iattr *iattr, struct nfs4_acl **acl,
 		   struct xdr_netobj *label, int *umask)
 {
-	struct timespec ts;
 	int expected_len, len = 0;
 	u32 dummy32;
 	char *buf;
@@ -422,8 +419,7 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 		switch (dummy32) {
 		case NFS4_SET_TO_CLIENT_TIME:
 			len += 12;
-			status = nfsd4_decode_time(argp, &ts);
-			iattr->ia_atime = timespec_to_timespec64(ts);
+			status = nfsd4_decode_time(argp, &iattr->ia_atime);
 			if (status)
 				return status;
 			iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
@@ -442,8 +438,7 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 		switch (dummy32) {
 		case NFS4_SET_TO_CLIENT_TIME:
 			len += 12;
-			status = nfsd4_decode_time(argp, &ts);
-			iattr->ia_mtime = timespec_to_timespec64(ts);
+			status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 			if (status)
 				return status;
 			iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);

fs/nfsd/xdr4.h

@@ -472,7 +472,7 @@ struct nfsd4_layoutcommit {
 	u32			lc_reclaim;	/* request */
 	u32			lc_newoffset;	/* request */
 	u64			lc_last_wr;	/* request */
-	struct timespec		lc_mtime;	/* request */
+	struct timespec64	lc_mtime;	/* request */
 	u32			lc_layout_type;	/* request */
 	u32			lc_up_len;	/* layout length */
 	void			*lc_up_layout;	/* decoded by callback */