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authorMiklos Szeredi <mszeredi@redhat.com>2021-04-07 15:36:44 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2021-04-12 16:04:29 +0300
commitd701ea284cf908c2c9aeed54e3c851927155796f (patch)
tree5b22385dfd3b450aeeb93ab74784d28ec55b8914 /fs/efivarfs/inode.c
parent9fefd5db08ce01abffffcdca3dc0964d9cb6ee69 (diff)
downloadlinux-d701ea284cf908c2c9aeed54e3c851927155796f.tar.xz
efivars: convert to fileattr
Use the fileattr API to let the VFS handle locking, permission checking and conversion. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Diffstat (limited to 'fs/efivarfs/inode.c')
-rw-r--r--fs/efivarfs/inode.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/fs/efivarfs/inode.c b/fs/efivarfs/inode.c
index 14e2947975fd..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:
@@ -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,
+};