NFSv4: NFSv4 callbacks also support 64-bit timestamps

Convert the NFSv4 callbacks to use struct timestamp64, rather than
truncating times to 32-bit values.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/callback.h

@@ -72,8 +72,8 @@ struct cb_getattrres {
 	uint32_t bitmap[2];
 	uint64_t size;
 	uint64_t change_attr;
-	struct timespec ctime;
-	struct timespec mtime;
+	struct timespec64 ctime;
+	struct timespec64 mtime;
 };
 
 struct cb_recallargs {

fs/nfs/callback_proc.c

@@ -56,8 +56,8 @@ __be32 nfs4_callback_getattr(void *argp, void *resp,
 	res->change_attr = delegation->change_attr;
 	if (nfs_have_writebacks(inode))
 		res->change_attr++;
-	res->ctime = timespec64_to_timespec(inode->i_ctime);
-	res->mtime = timespec64_to_timespec(inode->i_mtime);
+	res->ctime = inode->i_ctime;
+	res->mtime = inode->i_mtime;
 	res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
 		args->bitmap[0];
 	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &

fs/nfs/callback_xdr.c

@@ -627,7 +627,7 @@ static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, u
 	return 0;
 }
 
-static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
+static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time)
 {
 	__be32 *p;
 
@@ -639,14 +639,14 @@ static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *ti
 	return 0;
 }
 
-static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
+static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
 {
 	if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
 		return 0;
 	return encode_attr_time(xdr,time);
 }
 
-static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
+static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
 {
 	if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
 		return 0;