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Commit f2c77f4e authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFS: Optimise nfs_lookup_revalidate() 



We don't need to call nfs_revalidate_inode() on the directory if we already
know that the verifiers don't match.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 6d2b2966

fs/nfs/dir.c

+8 −7
Original line number Diff line number Diff line
@@ -646,9 +646,14 @@ static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) 
{

	if (IS_ROOT(dentry))

		return 1;

	if (nfs_verify_change_attribute(dir, dentry->d_time))

		return 1;

	if (!nfs_verify_change_attribute(dir, dentry->d_time))

		return 0;

	/* Revalidate nfsi->cache_change_attribute before we declare a match */

	if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)

		return 0;

	if (!nfs_verify_change_attribute(dir, dentry->d_time))

		return 0;

	return 1;

}



static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
@@ -742,10 +747,6 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) 
	nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);

	inode = dentry->d_inode;



	/* Revalidate parent directory attribute cache */

	if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)

		goto out_zap_parent;



	if (!inode) {

		if (nfs_neg_need_reval(dir, dentry, nd))

			goto out_bad;