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https://bugs.centos.org/view.php?id=7369
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http://kozlex.blogspot.com/2015/05/building-ecryptfs-on-redhat-7_19.html
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To fix ecryptfs and build it in the kernel follow is the partial fix:
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This is a fix that will not be proposed to upstream cause it is not 
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compatible with other kernels; instead it is a patch to make ecryptfs 
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work on Rhel7 only.
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--- a/fs/ecryptfs/main.c	2015-03-06 13:45:38.000000000 -0800
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+++ b/fs/ecryptfs/main.c	2015-07-02 14:46:37.000000000 -0700
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@@ -500,6 +500,7 @@ static struct dentry *ecryptfs_mount(str
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 	struct path path;
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 	uid_t check_ruid;
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 	int rc;
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+	int *s_stack_depth;
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 	sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL);
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 	if (!sbi) {
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@@ -567,10 +568,10 @@ static struct dentry *ecryptfs_mount(str
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 	s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
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 	s->s_blocksize = path.dentry->d_sb->s_blocksize;
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 	s->s_magic = ECRYPTFS_SUPER_MAGIC;
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-	s->s_stack_depth = path.dentry->d_sb->s_stack_depth + 1;
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+	s_stack_depth = get_s_stack_depth(path.dentry->d_sb);
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 	rc = -EINVAL;
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-	if (s->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
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+	if ( *s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
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 		pr_err("eCryptfs: maximum fs stacking depth exceeded\n");
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 		goto out_free;
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 	}