NFS: Clean up nfs_size_to_loff_t()

Use the same file size limit that lockd uses, and replace a signed v. unsigned comparison.

---

 include/linux/nfs_fs.h |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

index 0543439..457a22b 100644
@@ -505,12 +505,10 @@ extern int  nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
  * inline functions
  */
 
-static inline loff_t
-nfs_size_to_loff_t(__u64 size)
+static inline loff_t nfs_size_to_loff_t(__u64 size)
 {
-	loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
-	if (size > maxsz)
-		return maxsz;
+	if (size > (__u64) OFFSET_MAX - 1)
+		return OFFSET_MAX - 1;
 	return (loff_t) size;
 }
 

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