linux-kernel - Re: [PATCH V2] nvme: Add compat_ioctl handler for NVME_IOCTL_SUBMIT

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Date:   Wed, 18 Mar 2020 00:43:43 +0900
From:   Keith Busch <kbusch@...nel.org>
To:     masahiro31.yamada@...xia.com
Cc:     axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] nvme: Add compat_ioctl handler for
 NVME_IOCTL_SUBMIT_IO

On Thu, Mar 05, 2020 at 11:13:29AM +0000, masahiro31.yamada@...xia.com wrote:
> Currently 32 bit application gets ENOTTY when it calls
> compat_ioctl with NVME_IOCTL_SUBMIT_IO in 64 bit kernel.
> 
> The cause is that the results of sizeof(struct nvme_user_io),
> which is used to define NVME_IOCTL_SUBMIT_IO,
> are not same between 32 bit compiler and 64 bit compiler.
> 
> * 32 bit: the result of sizeof nvme_user_io is 44.
> * 64 bit: the result of sizeof nvme_user_io is 48.
> 
> 64 bit compiler seems to add 32 bit padding for multiple of 8 bytes.
> 
> This patch adds a compat_ioctl handler.
> The handler replaces NVME_IOCTL_SUBMIT_IO32 with NVME_IOCTL_SUBMIT_IO
> in case 32 bit application calls compat_ioctl for submit in 64 bit kernel.
> Then, it calls nvme_ioctl as usual.
> 
> Signed-off-by: Masahiro Yamada (KIOXIA) <masahiro31.yamada@...xia.com>

Thank you, applied for 5.7.