Tomo,
Please find the patch re-attached with more verbose description.
A MMC device without a backingstore is emulated as a drive with no
disk/media inserted.
Once a backingstore is added at later stage, this changes emulation to
"disk is now inserted"
(
Since SSC also support removable media, it may be useful to do the same for SSC.
I do not know enough about the SSC emualtion to know if the SSC
emulation supports
"no backingstore == emulate tape drive with no tape loaded".
If it doesnt, it might be worth adding at some stage.
)
regards
ronnie sahlberg
On Wed, Jan 4, 2012 at 12:55 PM, FUJITA Tomonori
<fujita.tomonori@xxxxxxxxxxxxx> wrote:
> On Sat, 24 Dec 2011 17:41:35 +1100
> ronnie sahlberg <ronniesahlberg@xxxxxxxxx> wrote:
>
>> From 33fa2ee29adfcaba5e89fcc6aecf737f4a2cfc38 Mon Sep 17 00:00:00 2001
>> From: Ronnie Sahlberg <ronniesahlberg@xxxxxxxxx>
>> Date: Sat, 24 Dec 2011 13:02:06 +1100
>> Subject: [PATCH] TGTADM: Allow creating CD/DVD devices that do not have a backingstore
>>
>>
>> Signed-off-by: Ronnie Sahlberg <ronniesahlberg@xxxxxxxxx>
>> ---
>> usr/tgtadm.c | 2 +-
>> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> Can you please resend this patch with the proper description?
>
> tgt works properly when an initioator accesses to an lu that doesn't
> have backingstore, right?
>
>
>> diff --git a/usr/tgtadm.c b/usr/tgtadm.c
>> index 41e9e99..7dca0f8 100644
>> --- a/usr/tgtadm.c
>> +++ b/usr/tgtadm.c
>> @@ -779,7 +779,7 @@ int main(int argc, char **argv)
>> "allowed/supported\n", rc);
>> exit(EINVAL);
>> }
>> - if (!path) {
>> + if (!path && dev_type != TYPE_MMC) {
>> eprintf("'backing-store' option "
>> "is necessary\n");
>> exit(EINVAL);
>> --
>> 1.7.3.1
>>
Attachment:
0001-MMC-Allow-creating-MMC-LUNS-that-do-not-have-a-backi.patch.gz
Description: GNU Zip compressed data
From a30876ca22685805285692e1e969f6fc07f4a24b Mon Sep 17 00:00:00 2001
From: Ronnie Sahlberg <ronniesahlberg@xxxxxxxxx>
Date: Thu, 5 Jan 2012 10:35:41 +1100
Subject: [PATCH] MMC: Allow creating MMC LUNS that do not have a backingstore.
An MMC device without a backing store is emulated as an empty drive, with no media in it. TGTD will respond to all scsi i/o just like a scsi dved drive that does not have any media.
As soon as a backing store is added at a later time, the TGTD emulation will switch to instead emulate a DVD drive with either a blank disk in the tray, that can be written to (if the file is zero-length) or as a DVD drive with a DVD-ROM disk in the tray (if the backing store is a .iso image)
Being able to create DVD drives without any backing file is useful for when creating a jukebox. In that case it is most convenient to create the drive without any media loaded and then later use MTX to move media from astorage slot into the drive.
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@xxxxxxxxx>
---
usr/tgtadm.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/usr/tgtadm.c b/usr/tgtadm.c
index 41e9e99..7dca0f8 100644
--- a/usr/tgtadm.c
+++ b/usr/tgtadm.c
@@ -779,7 +779,7 @@ int main(int argc, char **argv)
"allowed/supported\n", rc);
exit(EINVAL);
}
- if (!path) {
+ if (!path && dev_type != TYPE_MMC) {
eprintf("'backing-store' option "
"is necessary\n");
exit(EINVAL);
--
1.7.3.1
