btrfs: allow idmapped setattr inode op

Enable btrfs_setattr() to handle idmapped mounts. This is just a matter
of passing down the mount's userns.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c040d99..88ac63f 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5392,7 +5392,7 @@ static int btrfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentr
        if (btrfs_root_readonly(root))
                return -EROFS;
 
-       err = setattr_prepare(&init_user_ns, dentry, attr);
+       err = setattr_prepare(mnt_userns, dentry, attr);
        if (err)
                return err;
 
@@ -5403,13 +5403,12 @@ static int btrfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentr
        }
 
        if (attr->ia_valid) {
-               setattr_copy(&init_user_ns, inode, attr);
+               setattr_copy(mnt_userns, inode, attr);
                inode_inc_iversion(inode);
                err = btrfs_dirty_inode(inode);
 
                if (!err && attr->ia_valid & ATTR_MODE)
-                       err = posix_acl_chmod(&init_user_ns, inode,
-                                             inode->i_mode);
+                       err = posix_acl_chmod(mnt_userns, inode, inode->i_mode);
        }
 
        return err;