From: Rusty Russell Date: Mon, 22 Oct 2007 01:03:38 +0000 (+1000) Subject: Block driver using virtio. X-Git-Tag: v2.6.24-rc1~28^2~13 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e467cde238184d1b0923db2cd61ae1c5a6dc15aa;p=pandora-kernel.git Block driver using virtio. The block driver uses scatter-gather lists with sg[0] being the request information (struct virtio_blk_outhdr) with the type, sector and inbuf id. The next N sg entries are the bio itself, then the last sg is the status byte. Whether the N entries are in or out depends on whether it's a read or a write. We accept the normal (SCSI) ioctls: they get handed through to the other side which can then handle it or reply that it's unsupported. It's not clear that this actually works in general, since I don't know if blk_pc_request() requests have an accurate rq_data_dir(). Although we try to reply -ENOTTY on unsupported commands, ioctl(fd, CDROMEJECT) returns success to userspace. This needs a separate patch. Signed-off-by: Rusty Russell Cc: Jens Axboe --- Reading git-diff-tree failed