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authorRusty Russell <rusty@rustcorp.com.au>2007-10-21 21:03:38 -0400
committerRusty Russell <rusty@rustcorp.com.au>2007-10-23 01:49:54 -0400
commite467cde238184d1b0923db2cd61ae1c5a6dc15aa (patch)
tree1383321c88ca25fcad20f56f14a8ca658bb25fb3 /drivers/block/Kconfig
parent296f96fcfc160e29c01819c0c7b20c2dc8320edd (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/Kconfig6
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
425 block device driver. It communicates with a back-end driver 425 block device driver. It communicates with a back-end driver
426 in another domain which drives the actual block device. 426 in another domain which drives the actual block device.
427 427
428config VIRTIO_BLK
429 tristate "Virtio block driver (EXPERIMENTAL)"
430 depends on EXPERIMENTAL && VIRTIO
431 ---help---
432 This is the virtual block driver for lguest. Say Y or M.
433
428endif # BLK_DEV 434endif # BLK_DEV