No, isofs does not support read_iter. ________________________________________ 发件人: hch@xxxxxxxxxxxxx <hch@xxxxxxxxxxxxx> 发送时间: 2025年5月20日 14:46 收件人: Xu, Lizhi 抄送: Christian Hesse; axboe@xxxxxxxxx; christian@xxxxxxxxx; hch@xxxxxxxxxxxxx; linux-block@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; ming.lei@xxxxxxxxxx; syzbot+6af973a3b8dfd2faefdc@xxxxxxxxxxxxxxxxxxxxxxxxx; syzkaller-bugs@xxxxxxxxxxxxxxxx 主题: Re: 回复: [PATCH V5] loop: Add sanity check for read/write_iter CAUTION: This email comes from a non Wind River email account! Do not click links or open attachments unless you recognize the sender and know the content is safe. On Tue, May 20, 2025 at 06:29:48AM +0000, Xu, Lizhi wrote: > I figured out your steps to reproduce, and yes, this problem will occur if you do losetup with a file in a filesystem that does not support read_iter, which is what this patch does. isofs does support read_iter, without that it would not have worked before either. That is not the problem. It must be related to the FMODE_WRITE check - i.e. we have a writable FD here, but a file system that does not actually supports writes. Which honestly feels weird, but we'll have to figure it out to unbreak these setups.
