NFS: don't cache the verifer across ->lookup() calls

If the ->lookup() call causes the directory verifier to change, then there
is still no need to use the old verifier, since our dentry has been
verified.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index d58bfb8..7cd2697 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -735,7 +735,6 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
        int error;
        struct nfs_fh fhandle;
        struct nfs_fattr fattr;
-       unsigned long verifier;
 
        parent = dget_parent(dentry);
        lock_kernel();
@@ -770,7 +769,6 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
        if (NFS_STALE(inode))
                goto out_bad;
 
-       verifier = nfs_save_change_attribute(dir);
        error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
        if (error)
                goto out_bad;
@@ -779,7 +777,7 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
        if ((error = nfs_refresh_inode(inode, &fattr)) != 0)
                goto out_bad;
 
-       nfs_set_verifier(dentry, verifier);
+       nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
  out_valid:
        unlock_kernel();
        dput(parent);
@@ -1048,7 +1046,6 @@ static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd)
        struct dentry *parent = NULL;
        struct inode *inode = dentry->d_inode;
        struct inode *dir;
-       unsigned long verifier;
        int openflags, ret = 0;
 
        parent = dget_parent(dentry);
@@ -1076,10 +1073,9 @@ static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd)
         * change attribute *before* we do the RPC call.
         */
        lock_kernel();
-       verifier = nfs_save_change_attribute(dir);
        ret = nfs4_open_revalidate(dir, dentry, openflags, nd);
        if (ret == 1)
-               nfs_set_verifier(dentry, verifier);
+               nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
        unlock_kernel();
 out:
        dput(parent);