linux-kernel - Re: [PATCH -next 2/5] block: add ioctl to read the disk sequence number

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Date:   Mon, 15 Mar 2021 20:17:43 +0000
From:   Damien Le Moal <Damien.LeMoal@....com>
To:     Matthew Wilcox <willy@...radead.org>,
        Matteo Croce <mcroce@...ux.microsoft.com>
CC:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lennart Poettering <lennart@...ttering.net>,
        Luca Boccassi <bluca@...ian.org>, Jens Axboe <axboe@...nel.dk>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        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>,
        Ajay Joshi <Ajay.Joshi@....com>,
        Christoph Hellwig <hch@....de>,
        Matias Bjorling <Matias.Bjorling@....com>,
        Hans Holmberg <Hans.Holmberg@....com>,
        Dmitry Fomichev <Dmitry.Fomichev@....com>,
        Keith Busch <kbusch@...nel.org>,
        "Dmitry V. Levin" <ldv@...linux.org>
Subject: Re: [PATCH -next 2/5] block: add ioctl to read the disk sequence
 number

On 2021/03/16 5:14, Matthew Wilcox wrote:
> On Mon, Mar 15, 2021 at 09:02:39PM +0100, Matteo Croce wrote:
>> +++ b/include/uapi/linux/fs.h
>> @@ -184,6 +184,7 @@ struct fsxattr {
>>  #define BLKSECDISCARD _IO(0x12,125)
>>  #define BLKROTATIONAL _IO(0x12,126)
>>  #define BLKZEROOUT _IO(0x12,127)
>> +#define BLKGETDISKSEQ _IOR(0x12,128,__u64)
>>  /*
>>   * A jump here: 130-131 are reserved for zoned block devices
>>   * (see uapi/linux/blkzoned.h)
> 
> Not your bug, but this is now 130-136.
> 
> +cc all the people who signed off on the commits that added those ioctl
> numbers without updating this comment.  Perhaps one of them will figure
> out how to stop this happening in future.
> 

Indeed. Will be more careful :)
And send a patch to fix this.

Thanks !

-- 
Damien Le Moal
Western Digital Research