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author | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-22 11:03:38 +1000 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-23 15:49:54 +1000 |
commit | e467cde238184d1b0923db2cd61ae1c5a6dc15aa (patch) | |
tree | 1383321c88ca25fcad20f56f14a8ca658bb25fb3 /drivers/char/Makefile | |
parent | 296f96fcfc160e29c01819c0c7b20c2dc8320edd (diff) | |
download | talos-obmc-linux-e467cde238184d1b0923db2cd61ae1c5a6dc15aa.tar.gz talos-obmc-linux-e467cde238184d1b0923db2cd61ae1c5a6dc15aa.zip |
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/char/Makefile')
0 files changed, 0 insertions, 0 deletions