These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / fs / efivarfs / file.c

diff --git a/kernel/fs/efivarfs/file.c b/kernel/fs/efivarfs/file.c
index 90001da..66842e5 100644 (file)
--- a/kernel/fs/efivarfs/file.c
+++ b/kernel/fs/efivarfs/file.c
@@ -10,6 +10,7 @@
 #include <linux/efi.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
+#include <linux/mount.h>
 
 #include "internal.h"
 
@@ -103,9 +104,78 @@ out_free:
        return size;
 }
 
+static int
+efivarfs_ioc_getxflags(struct file *file, void __user *arg)
+{
+       struct inode *inode = file->f_mapping->host;
+       unsigned int i_flags;
+       unsigned int flags = 0;
+
+       i_flags = inode->i_flags;
+       if (i_flags & S_IMMUTABLE)
+               flags |= FS_IMMUTABLE_FL;
+
+       if (copy_to_user(arg, &flags, sizeof(flags)))
+               return -EFAULT;
+       return 0;
+}
+
+static int
+efivarfs_ioc_setxflags(struct file *file, void __user *arg)
+{
+       struct inode *inode = file->f_mapping->host;
+       unsigned int flags;
+       unsigned int i_flags = 0;
+       int error;
+
+       if (!inode_owner_or_capable(inode))
+               return -EACCES;
+
+       if (copy_from_user(&flags, arg, sizeof(flags)))
+               return -EFAULT;
+
+       if (flags & ~FS_IMMUTABLE_FL)
+               return -EOPNOTSUPP;
+
+       if (!capable(CAP_LINUX_IMMUTABLE))
+               return -EPERM;
+
+       if (flags & FS_IMMUTABLE_FL)
+               i_flags |= S_IMMUTABLE;
+
+
+       error = mnt_want_write_file(file);
+       if (error)
+               return error;
+
+       mutex_lock(&inode->i_mutex);
+       inode_set_flags(inode, i_flags, S_IMMUTABLE);
+       mutex_unlock(&inode->i_mutex);
+
+       mnt_drop_write_file(file);
+
+       return 0;
+}
+
+long
+efivarfs_file_ioctl(struct file *file, unsigned int cmd, unsigned long p)
+{
+       void __user *arg = (void __user *)p;
+
+       switch (cmd) {
+       case FS_IOC_GETFLAGS:
+               return efivarfs_ioc_getxflags(file, arg);
+       case FS_IOC_SETFLAGS:
+               return efivarfs_ioc_setxflags(file, arg);
+       }
+
+       return -ENOTTY;
+}
+
 const struct file_operations efivarfs_file_operations = {
        .open   = simple_open,
        .read   = efivarfs_file_read,
        .write  = efivarfs_file_write,
        .llseek = no_llseek,
+       .unlocked_ioctl = efivarfs_file_ioctl,
 };