diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-22 11:03:38 +1000 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-23 15:49:54 +1000 |
| commit | e467cde238184d1b0923db2cd61ae1c5a6dc15aa (patch) | |
| tree | 1383321c88ca25fcad20f56f14a8ca658bb25fb3 /drivers/block/Kconfig | |
| parent | 296f96fcfc160e29c01819c0c7b20c2dc8320edd (diff) | |
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 <rusty@rustcorp.com.au>
Cc: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/block/Kconfig')
| -rw-r--r-- | drivers/block/Kconfig | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig index ce4b1e484e64..4d0119ea9e35 100644 --- a/drivers/block/Kconfig +++ b/drivers/block/Kconfig @@ -425,4 +425,10 @@ config XEN_BLKDEV_FRONTEND block device driver. It communicates with a back-end driver in another domain which drives the actual block device. +config VIRTIO_BLK + tristate "Virtio block driver (EXPERIMENTAL)" + depends on EXPERIMENTAL && VIRTIO + ---help--- + This is the virtual block driver for lguest. Say Y or M. + endif # BLK_DEV |