NFSv4: Just don't cache negative dentries on case insensitive servers

If the directory contents change, we cannot rely on the negative dentry
being cacheable.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 9883f72fdb6fa372fd3870b0af377074b2317182..7ebfe4e3cf85213537f2c204c0b6516443a9830b 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1436,6 +1436,9 @@ int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry,
                return 0;
        if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG)
                return 1;
+       /* Case insensitive server? Revalidate negative dentries */
+       if (nfs_server_capable(dir, NFS_CAP_CASE_INSENSITIVE))
+               return 1;
        return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU);
 }