To obey NFS cache semantics, the client must verify the cached attributes when a file is opened. In most cases this is done by a call to d_validate as one of the last steps in path_walk. However for the root of a filesystem, d_validate is only ever called on the mounted-on filesystem (except when the path ends '.' or '..'). So NFS has no chance to validate the attributes. So, in nfs_opendir, we revalidate the attributes if the opened directory is the mountpoint. This may cause double-validation for "." and ".." lookups, but that is better than missing regular /path/name lookups completely. Signed-off-by: NeilBrown <neilb@xxxxxxx> diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index ee9a179..72062da 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -140,6 +140,13 @@ nfs_opendir(struct inode *inode, struct file *filp) /* Call generic open code in order to cache credentials */ res = nfs_open(inode, filp); + if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) { + /* This is a mountpoint, so d_revalidate will never + * have been called, so we need to refresh the + * inode (for close-open consistency) ourselves. + */ + __nfs_revalidate_inode(NFS_SERVER(inode), inode); + } return res; } -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html