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Message-ID: <TU4PR8401MB10558BB52D2F37CFC96FB8B8AB159@TU4PR8401MB1055.NAMPRD84.PROD.OUTLOOK.COM>
Date: Mon, 12 Jul 2021 19:22:43 +0000
From: "Elliott, Robert (Servers)" <elliott@....com>
To: 'Matteo Croce' <mcroce@...ux.microsoft.com>,
"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
Jens Axboe <axboe@...nel.dk>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Lennart Poettering" <lennart@...ttering.net>,
Luca Boccassi <bluca@...ian.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Damien Le Moal <damien.lemoal@....com>,
Tejun Heo <tj@...nel.org>,
Javier González <javier@...igon.com>,
Niklas Cassel <niklas.cassel@....com>,
Johannes Thumshirn <johannes.thumshirn@....com>,
Hannes Reinecke <hare@...e.de>,
Matthew Wilcox <willy@...radead.org>,
Christoph Hellwig <hch@...radead.org>,
JeffleXu <jefflexu@...ux.alibaba.com>
Subject: RE: [PATCH v4 3/5] block: add ioctl to read the disk sequence number
> -----Original Message-----
> From: Matteo Croce <mcroce@...ux.microsoft.com>
> Sent: Sunday, July 11, 2021 12:54 PM
...
> Subject: [PATCH v4 3/5] block: add ioctl to read the disk sequence number
>
> From: Matteo Croce <mcroce@...rosoft.com>
>
> Add a new BLKGETDISKSEQ ioctl which retrieves the disk sequence number
> from the genhd structure.
...
Given:
static int put_u64(u64 __user *argp, u64 val)
{
return put_user(val, argp);
}
> diff --git a/block/ioctl.c b/block/ioctl.c
> index 24beec9ca9c9..0c3a4a53fa11 100644
> --- a/block/ioctl.c
> +++ b/block/ioctl.c
> @@ -469,6 +469,8 @@ static int blkdev_common_ioctl(struct block_device
> *bdev, fmode_t mode,
> BLKDEV_DISCARD_SECURE);
...
> + case BLKGETDISKSEQ:
> + return put_u64(argp, bdev->bd_disk->diskseq);
How does that work on a system in which int is 32 bits?
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