From 6b96724e507fecc3e6440e86426fe4f44359ed66 Mon Sep 17 00:00:00 2001 From: Ricardo Labiaga Date: Tue, 12 Oct 2010 16:30:05 -0700 Subject: Revalidate caches on lock Instead of blindly zapping the caches, attempt to revalidate them if the server has indicated that it uses high resolution timestamps. NFSv4 should be able to always revalidate the cache since the protocol requires the update of the change attribute on modification of the data. In reality, there are servers (the Linux NFS server for example) that do not obey this requirement and use ctime as the basis for change attribute. Long term, the server needs to be fixed. At this time, and to be on the safe side, continue zapping caches if the server indicates that it does not have a high resolution timestamp. Signed-off-by: Ricardo Labiaga Signed-off-by: Trond Myklebust --- include/linux/nfs_fs_sb.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/nfs_fs_sb.h') diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h index c82ee7cd6288..5eef862ec187 100644 --- a/include/linux/nfs_fs_sb.h +++ b/include/linux/nfs_fs_sb.h @@ -124,6 +124,7 @@ struct nfs_server { struct nfs_fsid fsid; __u64 maxfilesize; /* maximum file size */ + struct timespec time_delta; /* smallest time granularity */ unsigned long mount_time; /* when this fs was mounted */ dev_t s_dev; /* superblock dev numbers */ -- cgit v1.2.2