diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2014-03-05 15:45:00 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2014-03-05 16:58:20 +0100 |
| commit | f47c3f5a800a927238d20de9f99b5c77f0bc3fe0 (patch) | |
| tree | c36a93d6af8e3a450132d95acf8c582bc00866d6 /block/iscsi.c | |
| parent | 2fa4c042bc55ec10b9ca16163697d02cddd2d768 (diff) | |
iscsi: Use bs->sg for everything else than disks
The current iscsi block driver code makes the rather arbitrary decision
that TYPE_MEDIUM_CHANGER and TYPE_TAPE devices have bs->sg = 1 and all
other device types are disks.
Instead of this, check for TYPE_DISK to expose the disk interface and
make everything else bs->sg = 1. In particular, this includes devices
with TYPE_STORAGE_ARRAY, which is what LUN 0 of an iscsi target is.
(See https://bugzilla.redhat.com/show_bug.cgi?id=1067784 for the exact
scenario.)
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'block/iscsi.c')
| -rw-r--r-- | block/iscsi.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/block/iscsi.c b/block/iscsi.c index 0a15f53f8c..b490e98c05 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -1231,12 +1231,11 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); bs->request_alignment = iscsilun->block_size; - /* Medium changer or tape. We dont have any emulation for this so this must - * be sg ioctl compatible. We force it to be sg, otherwise qemu will try - * to read from the device to guess the image format. + /* We don't have any emulation for devices other than disks and CD-ROMs, so + * this must be sg ioctl compatible. We force it to be sg, otherwise qemu + * will try to read from the device to guess the image format. */ - if (iscsilun->type == TYPE_MEDIUM_CHANGER || - iscsilun->type == TYPE_TAPE) { + if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { bs->sg = 1; } |