linux-kernel - Re: [PATCH v13 03/12] splice: Do splice read from a buffered file without using ITER

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Message-ID: <e9d2baf8-4a70-313d-eebe-f0e4d1646971@roeck-us.net>
Date:   Mon, 13 Feb 2023 15:25:05 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     David Howells <dhowells@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v13 03/12] splice: Do splice read from a buffered file
 without using ITER_PIPE

On 2/13/23 15:12, David Howells wrote:
> Guenter Roeck <linux@...ck-us.net> wrote:
> 
>> Both are initrd.
> 
> Do you mean rootfs?  And, if so, is that tmpfs-based or ramfs-based?
> 

Both are provided to the kernel using the -initrd qemu option,
which usually means that the address/location is passed to the kernel
through either a register or a data structure. I have not really paid
much attention to what the kernel is doing with that information.
It is in cpio format, so it must be decompressed, but I don't know how
it is actually handled (nor why this doesn't fail on other boots
from initrd).

Guenter