1 files changed, 46 insertions, 2 deletions

diff --git a/fs/efivarfs/inode.c b/fs/efivarfs/inode.c
index 0297ad95eb5c..939e5e242b98 100644
--- a/fs/efivarfs/inode.c
+++ b/fs/efivarfs/inode.c
@@ -10,9 +10,12 @@
 #include <linux/kmemleak.h>
 #include <linux/slab.h>
 #include <linux/uuid.h>
+#include <linux/fileattr.h>
 
 #include "internal.h"
 
+static const struct inode_operations efivarfs_file_inode_operations;
+
 struct inode *efivarfs_get_inode(struct super_block *sb,
 				const struct inode *dir, int mode,
 				dev_t dev, bool is_removable)
@@ -26,6 +29,7 @@ struct inode *efivarfs_get_inode(struct super_block *sb,
 		inode->i_flags = is_removable ? 0 : S_IMMUTABLE;
 		switch (mode & S_IFMT) {
 		case S_IFREG:
+			inode->i_op = &efivarfs_file_inode_operations;
 			inode->i_fop = &efivarfs_file_operations;
 			break;
 		case S_IFDIR:
@@ -66,8 +70,8 @@ bool efivarfs_valid_name(const char *str, int len)
 	return uuid_is_valid(s);
 }
 
-static int efivarfs_create(struct inode *dir, struct dentry *dentry,
-			  umode_t mode, bool excl)
+static int efivarfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+			   struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct inode *inode = NULL;
 	struct efivar_entry *var;
@@ -138,3 +142,43 @@ const struct inode_operations efivarfs_dir_inode_operations = {
 	.unlink = efivarfs_unlink,
 	.create = efivarfs_create,
 };
+
+static int
+efivarfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
+{
+	unsigned int i_flags;
+	unsigned int flags = 0;
+
+	i_flags = d_inode(dentry)->i_flags;
+	if (i_flags & S_IMMUTABLE)
+		flags |= FS_IMMUTABLE_FL;
+
+	fileattr_fill_flags(fa, flags);
+
+	return 0;
+}
+
+static int
+efivarfs_fileattr_set(struct user_namespace *mnt_userns,
+		      struct dentry *dentry, struct fileattr *fa)
+{
+	unsigned int i_flags = 0;
+
+	if (fileattr_has_fsx(fa))
+		return -EOPNOTSUPP;
+
+	if (fa->flags & ~FS_IMMUTABLE_FL)
+		return -EOPNOTSUPP;
+
+	if (fa->flags & FS_IMMUTABLE_FL)
+		i_flags |= S_IMMUTABLE;
+
+	inode_set_flags(d_inode(dentry), i_flags, S_IMMUTABLE);
+
+	return 0;
+}
+
+static const struct inode_operations efivarfs_file_inode_operations = {
+	.fileattr_get = efivarfs_fileattr_get,
+	.fileattr_set = efivarfs_fileattr_set,
+};