Re: [PATCH vfs.all 15/26] s390/dasd: use bdev api in dasd_format()

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To: Stefan Haberland <sth@xxxxxxxxxxxxx>
Subject: Re: [PATCH vfs.all 15/26] s390/dasd: use bdev api in dasd_format()
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Tue, 30 Apr 2024 01:30:36 +0100
Cc: linux-s390@xxxxxxxxxxxxxxx, jack@xxxxxxx, hch@xxxxxx, brauner@xxxxxxxxxx, axboe@xxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, yi.zhang@xxxxxxxxxx, yangerkun@xxxxxxxxxx, yukuai3@xxxxxxxxxx, Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>, Eduard Shishkin <edward6@xxxxxxxxxxxxx>, Alexander Gordeev <agordeev@xxxxxxxxxxxxx>, Jan Hoeppner <hoeppner@xxxxxxxxxxxxx>
In-reply-to: <dc4325fb-d723-4d9f-adb7-7ee65a195231@linux.ibm.com>
References: <20240406090930.2252838-1-yukuai1@huaweicloud.com> <20240406090930.2252838-16-yukuai1@huaweicloud.com> <20240416013555.GZ2118490@ZenIV> <Zh47IY7M1LQXjckX@li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com> <ca513589-2110-45fe-95b7-5ce23487ea10@linux.ibm.com> <20240428185823.GW2118490@ZenIV> <20240428232349.GY2118490@ZenIV> <dc4325fb-d723-4d9f-adb7-7ee65a195231@linux.ibm.com>

On Mon, Apr 29, 2024 at 04:41:19PM +0200, Stefan Haberland wrote:

> The dasdfmt tool checks if the disk is actually in use and refuses to
> work on an 'in use' DASD.
> So for example a partition that was in use has to be unmounted first.

Hmm...  How is that check done?  Does it open device exclusive?

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References:
- Re: [PATCH vfs.all 15/26] s390/dasd: use bdev api in dasd_format()
  - From: Al Viro
- Re: [PATCH vfs.all 15/26] s390/dasd: use bdev api in dasd_format()
  - From: Alexander Gordeev
- Re: [PATCH vfs.all 15/26] s390/dasd: use bdev api in dasd_format()
  - From: Stefan Haberland
- Re: [PATCH vfs.all 15/26] s390/dasd: use bdev api in dasd_format()
  - From: Al Viro
- Re: [PATCH vfs.all 15/26] s390/dasd: use bdev api in dasd_format()
  - From: Al Viro
- Re: [PATCH vfs.all 15/26] s390/dasd: use bdev api in dasd_format()
  - From: Stefan Haberland

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