2 fixes that improve on the consistency of the NFS client cache.

- Change the cached mtime to a 'struct timespec' from a
  time_t. Improving the precision of the cached mtime tightens up
  NFS' "close-to-open" consistency considerably.
- Always force an over-the-wire consistency check from nfs_open()
  (unless the file is marked modified). This further improves
  NFS' "close-to-open" consistency.

Submitted by:	Mohan Srinivasan mohans at yahoo-inc dot com

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/nfsclient/nfsnode.h b/sys/nfsclient/nfsnode.h
index 21bb0d184f08..4a4d835e7f00 100644
--- a/sys/nfsclient/nfsnode.h
+++ b/sys/nfsclient/nfsnode.h
@@ -97,7 +97,7 @@ struct nfsnode {
 	u_int32_t		n_mode;		/* ACCESS mode cache */
 	uid_t			n_modeuid;	/* credentials having mode */
 	time_t			n_modestamp;	/* mode cache timestamp */
-	time_t			n_mtime;	/* Prev modify time. */
+	struct timespec		n_mtime;	/* Prev modify time. */
 	time_t			n_ctime;	/* Prev create time. */
 	time_t			n_expiry;	/* Lease expiry time */
 	nfsfh_t			*n_fhp;		/* NFS File Handle */
@@ -155,6 +155,8 @@ struct nfsnode {
 #define VTONFS(vp)	((struct nfsnode *)(vp)->v_data)
 #define NFSTOV(np)	((struct vnode *)(np)->n_vnode)
 
+#define NFS_TIMESPEC_COMPARE(T1, T2)	(((T1)->tv_sec != (T2)->tv_sec) || ((T1)->tv_nsec != (T2)->tv_nsec))
+
 /*
  * Queue head for nfsiod's
  */