Commit 9e142c41 authored by Miklos Szeredi's avatar Miklos Szeredi
Browse files

ovl: add ovl_fiemap() 



Implement stacked fiemap().

Need to split inode operations for regular file (which has fiemap) and
special file (which doesn't have fiemap).

Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent dab5ca8f

fs/overlayfs/inode.c

+28 −1
Original line number Diff line number Diff line
@@ -448,6 +448,23 @@ int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags) 
	return 0;

}



static int ovl_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,

		      u64 start, u64 len)

{

	int err;

	struct inode *realinode = ovl_inode_real(inode);

	const struct cred *old_cred;



	if (!realinode->i_op->fiemap)

		return -EOPNOTSUPP;



	old_cred = ovl_override_creds(inode->i_sb);

	err = realinode->i_op->fiemap(realinode, fieinfo, start, len);

	revert_creds(old_cred);



	return err;

}



static const struct inode_operations ovl_file_inode_operations = {

	.setattr	= ovl_setattr,

	.permission	= ovl_permission,
@@ -455,6 +472,7 @@ static const struct inode_operations ovl_file_inode_operations = { 
	.listxattr	= ovl_listxattr,

	.get_acl	= ovl_get_acl,

	.update_time	= ovl_update_time,

	.fiemap		= ovl_fiemap,

};



static const struct inode_operations ovl_symlink_inode_operations = {
@@ -465,6 +483,15 @@ static const struct inode_operations ovl_symlink_inode_operations = { 
	.update_time	= ovl_update_time,

};



static const struct inode_operations ovl_special_inode_operations = {

	.setattr	= ovl_setattr,

	.permission	= ovl_permission,

	.getattr	= ovl_getattr,

	.listxattr	= ovl_listxattr,

	.get_acl	= ovl_get_acl,

	.update_time	= ovl_update_time,

};



/*

 * It is possible to stack overlayfs instance on top of another

 * overlayfs instance as lower layer. We need to annonate the
@@ -548,7 +575,7 @@ static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev, 
		break;



	default:

		inode->i_op = &ovl_file_inode_operations;

		inode->i_op = &ovl_special_inode_operations;

		init_special_inode(inode, mode, rdev);

		break;

	}