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iscsi: Pick default initiator-name based on the name of the VM

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This patch updates the iscsi layer to automatically pick a 'unique'
initiator-name based on the name of the vm in case the user has not set
an explicit iqn-name to use.

Create a new function qemu_get_vm_name() that returns the name of the VM,
if specified.

This way we can thus create default names to use as the initiator name
based on the guest session.

If the VM is not named via the '-name' command line argument, the iscsi
initiator-name used wiull simply be

    iqn.2008-11.org.linux-kvm

If a name for the VM was specified with the '-name' option, iscsi will
use a default initiatorname of

    iqn.2008-11.org.linux-kvm:<name>

These names are just the default iscsi initiator name that qemu will
generate/use only when the user has not set an explicit initiator name
via the commandlines or config files.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
This commit is contained in:
Ronnie Sahlberg 2012-08-06 18:24:55 +10:00 • committed by Paolo Bonzini
parent f2ef4a6dd9
commit 31459f463a
6 changed files with 28 additions and 1 deletions
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8
qemu-options.hx
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@ -1897,6 +1897,11 @@ images for the guest storage. Both disk and cdrom images are supported.
Syntax for specifying iSCSI LUNs is
``iscsi://<target-ip>[:<port>]/<target-iqn>/<lun>''
By default qemu will use the iSCSI initiator-name
'iqn.2008-11.org.linux-kvm[:<name>]' but this can also be set from the command
line or a configuration file.
Example (without authentication):
@example
qemu-system-i386 -iscsi initiator-name=iqn.2001-04.com.example:my-initiator \
@ -1926,6 +1931,9 @@ DEF("iscsi", HAS_ARG, QEMU_OPTION_iscsi,
" iSCSI session parameters\n", QEMU_ARCH_ALL)
STEXI
iSCSI parameters such as username and password can also be specified via
a configuration file. See qemu-doc for more information and examples.
@item NBD
QEMU supports NBD (Network Block Devices) both using TCP protocol as well
as Unix Domain Sockets.