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Re: [Qemu-devel] [PATCH] block: return EPERM on writes or discards to re

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH] block: return EPERM on writes or discards to read-only devices
Date: Fri, 8 May 2015 11:24:34 +0100
User-agent: Mutt/1.5.23 (2014-03-12)

On Thu, May 07, 2015 at 05:45:48PM +0200, Paolo Bonzini wrote:
> This is the behavior in the operating system, for example Linux's
> blkdev_write_iter has the following:
>         if (bdev_read_only(I_BDEV(bd_inode)))
>                 return -EPERM;
> This does not apply to opening a device for read/write, when the
> device only supports read-only operation.  In this case any of
> EACCES, EPERM or EROFS is acceptable depending on why writing is
> not possible.
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
>  block/io.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Thanks, applied to my block tree:


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