linux-kernel - [PATCH v2 02/18] ecryptfs: stack miscattr ops

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Date:   Mon, 22 Mar 2021 15:49:00 +0100
From:   Miklos Szeredi <mszeredi@...hat.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     Al Viro <viro@...IV.linux.org.uk>, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>, Tyler Hicks <code@...icks.com>
Subject: [PATCH v2 02/18] ecryptfs: stack miscattr ops

Add stacking for the miscattr operations.

Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Cc: Tyler Hicks <code@...icks.com>
---
 fs/ecryptfs/inode.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 18e9285fbb4c..b7d18583c50f 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -18,6 +18,7 @@
 #include <linux/fs_stack.h>
 #include <linux/slab.h>
 #include <linux/xattr.h>
+#include <linux/miscattr.h>
 #include <asm/unaligned.h>
 #include "ecryptfs_kernel.h"
 
@@ -1118,6 +1119,23 @@ static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode,
 	return rc;
 }
 
+static int ecryptfs_miscattr_get(struct dentry *dentry, struct miscattr *ma)
+{
+	return vfs_miscattr_get(ecryptfs_dentry_to_lower(dentry), ma);
+}
+
+static int ecryptfs_miscattr_set(struct user_namespace *mnt_userns,
+				 struct dentry *dentry, struct miscattr *ma)
+{
+	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
+	int rc;
+
+	rc = vfs_miscattr_set(&init_user_ns, lower_dentry, ma);
+	fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry));
+
+	return rc;
+}
+
 const struct inode_operations ecryptfs_symlink_iops = {
 	.get_link = ecryptfs_get_link,
 	.permission = ecryptfs_permission,
@@ -1139,6 +1157,8 @@ const struct inode_operations ecryptfs_dir_iops = {
 	.permission = ecryptfs_permission,
 	.setattr = ecryptfs_setattr,
 	.listxattr = ecryptfs_listxattr,
+	.miscattr_get = ecryptfs_miscattr_get,
+	.miscattr_set = ecryptfs_miscattr_set,
 };
 
 const struct inode_operations ecryptfs_main_iops = {
@@ -1146,6 +1166,8 @@ const struct inode_operations ecryptfs_main_iops = {
 	.setattr = ecryptfs_setattr,
 	.getattr = ecryptfs_getattr,
 	.listxattr = ecryptfs_listxattr,
+	.miscattr_get = ecryptfs_miscattr_get,
+	.miscattr_set = ecryptfs_miscattr_set,
 };
 
 static int ecryptfs_xattr_get(const struct xattr_handler *handler,
-- 
2.30.2