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authorRusty Russell <rusty@rustcorp.com.au>2007-10-22 11:03:38 +1000
committerRusty Russell <rusty@rustcorp.com.au>2007-10-23 15:49:54 +1000
commite467cde238184d1b0923db2cd61ae1c5a6dc15aa (patch)
tree1383321c88ca25fcad20f56f14a8ca658bb25fb3 /drivers/char/Makefile
parent296f96fcfc160e29c01819c0c7b20c2dc8320edd (diff)
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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>
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