Re: [PATCH V5] loop: Add sanity check for read/write_iter

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To: "hch@xxxxxxxxxxxxx" <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH V5] loop: Add sanity check for read/write_iter
From: "Xu, Lizhi" <Lizhi.Xu@xxxxxxxxxxxxx>
Date: Tue, 20 May 2025 11:52:34 +0000
Accept-language: zh-CN, en-AS, en-US
Cc: Christian Hesse <mail@xxxxxxxx>, "axboe@xxxxxxxxx" <axboe@xxxxxxxxx>, "christian@xxxxxxxxx" <christian@xxxxxxxxx>, "linux-block@xxxxxxxxxxxxxxx" <linux-block@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "ming.lei@xxxxxxxxxx" <ming.lei@xxxxxxxxxx>, "syzbot+6af973a3b8dfd2faefdc@xxxxxxxxxxxxxxxxxxxxxxxxx" <syzbot+6af973a3b8dfd2faefdc@xxxxxxxxxxxxxxxxxxxxxxxxx>, "syzkaller-bugs@xxxxxxxxxxxxxxxx" <syzkaller-bugs@xxxxxxxxxxxxxxxx>
In-reply-to: <BL1PR11MB5979FDAE8B8831DD0F558552869FA@BL1PR11MB5979.namprd11.prod.outlook.com>
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References: <20250519175640.2fcac001@leda.eworm.net> <20250520030051.177205-1-lizhi.xu@windriver.com> <20250520073901.6fdfbee4@leda.eworm.net> <BL1PR11MB5979C666DA3BC228C2C30E92869FA@BL1PR11MB5979.namprd11.prod.outlook.com> <aCwlRMEuvvP31UGG@infradead.org> <BL1PR11MB5979CBE5243379E686674B1C869FA@BL1PR11MB5979.namprd11.prod.outlook.com> <aCxnTIwiVhBK-XIt@infradead.org> <BL1PR11MB5979E4700AE4B7B6A09681B8869FA@BL1PR11MB5979.namprd11.prod.outlook.com> <aCxqgDkHPHxrOFJH@infradead.org> <BL1PR11MB5979FDAE8B8831DD0F558552869FA@BL1PR11MB5979.namprd11.prod.outlook.com>

I added debugging code in loop_check_backing_file(), read_iter is NULL,
and I searched for read_iter in directly, so it says isofs does not support it.
I see isofs_read_inode is set in isofs_read_inode(), I will further investigate
why it is not set.

References:
- Re: [PATCH V5] loop: Add sanity check for read/write_iter
  - From: Christian Hesse
- Re: [PATCH V5] loop: Add sanity check for read/write_iter
  - From: Lizhi Xu
- Re: [PATCH V5] loop: Add sanity check for read/write_iter
  - From: Christian Hesse
- 回复: [PATCH V5] loop: Add sanity check for read/write_iter
  - From: Xu, Lizhi
- Re: 回复: [PATCH V5] loop: Add sanity check for read/write_iter
  - From: hch@xxxxxxxxxxxxx
- 回复: 回复: [PATCH V5] loop: Add sanity check for read/write_iter
  - From: Xu, Lizhi
- Re: 回复: 回复: [PATCH V5] loop: Add sanity check for read/write_iter
  - From: hch@xxxxxxxxxxxxx
- 回复: 回复: 回复: [PATCH V5] loop: Add sanity check for read/write_iter
  - From: Xu, Lizhi
- Re: 回复: 回复: 回复: [PATCH V5] loop: Add sanity check for read/write_iter
  - From: hch@xxxxxxxxxxxxx
- 回复: 回复: 回复: 回复: [PATCH V5] loop: Add sanity check for read/write_iter
  - From: Xu, Lizhi

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