[libvirt] [PATCH] qemu: Provide default LUN=0 for iSCSI if not provided
John Ferlan
jferlan at redhat.com
Wed Sep 6 16:05:32 UTC 2017
https://bugzilla.redhat.com/show_bug.cgi?id=1477880
If the "/#" is missing from the provided iSCSI path, then we need
to provide the default LUN of /0; otherwise, QEMU will fail to parse
the URL causing a failure to either create the guest or hotplug
attach the storage.
Alter the command lines generated appropriately. This change does not
effect the XML input files.
One 'side effect' of this for the argv2xml is that if a "/0" is found
on the command line, then the generated XML would need to add the "/0"
to the output XML since it wouldn't be known whether it existed or not
at qemu process creation time.
Signed-off-by: John Ferlan <jferlan at redhat.com>
---
NB: Investigated the history quite a bit between QEMU and libiscsi and
it seems as though this probably never worked and of course never "tested"
in a real environment. Ironically, in qapi/block-core.json, it is claimed
that the LUN would default to 0, but the block/iscsi.c code that calls
iscsi_parse_full_url would never (AFAICT) have supported not supplying
some LUN on the command line.
src/qemu/qemu_command.c | 20 ++++++++++++++++----
.../qemuargv2xml-disk-drive-network-iscsi.args | 2 +-
.../qemuargv2xml-disk-drive-network-iscsi.xml | 2 +-
.../qemuxml2argv-disk-drive-network-iscsi-lun.args | 2 +-
.../qemuxml2argv-disk-drive-network-iscsi.args | 2 +-
.../qemuxml2argv-hostdev-scsi-lsi-iscsi.args | 2 +-
.../qemuxml2argv-hostdev-scsi-virtio-iscsi.args | 2 +-
7 files changed, 22 insertions(+), 10 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index ed8cb6e..cff84de 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -830,10 +830,22 @@ qemuBuildNetworkDriveURI(virStorageSourcePtr src,
src->volume, src->path) < 0)
goto cleanup;
} else {
- if (virAsprintf(&uri->path, "%s%s",
- src->path[0] == '/' ? "" : "/",
- src->path) < 0)
- goto cleanup;
+ if (src->protocol == VIR_STORAGE_NET_PROTOCOL_ISCSI &&
+ !strchr(src->path, '/')) {
+
+ /* The details of iqn is defined by RFC 3720 and 3721, but
+ * we just need to make sure there's a lun provided. If not
+ * provided, then default to zero. If ISCSI LUN is provided
+ * by /dev/disk/by-path/... , then that path will have the
+ * specific lun requested. */
+ if (virAsprintf(&uri->path, "/%s/0", src->path) < 0)
+ goto cleanup;
+ } else {
+ if (virAsprintf(&uri->path, "%s%s",
+ src->path[0] == '/' ? "" : "/",
+ src->path) < 0)
+ goto cleanup;
+ }
}
}
diff --git a/tests/qemuargv2xmldata/qemuargv2xml-disk-drive-network-iscsi.args b/tests/qemuargv2xmldata/qemuargv2xml-disk-drive-network-iscsi.args
index 62cc5c0..ec2e8dc 100644
--- a/tests/qemuargv2xmldata/qemuargv2xml-disk-drive-network-iscsi.args
+++ b/tests/qemuargv2xmldata/qemuargv2xml-disk-drive-network-iscsi.args
@@ -16,7 +16,7 @@ QEMU_AUDIO_DRV=none \
-no-acpi \
-boot c \
-usb \
--drive file=iscsi://example.org:6000/iqn.1992-01.com.example,format=raw,\
+-drive file=iscsi://example.org:6000/iqn.1992-01.com.example/0,format=raw,\
if=virtio \
-drive file=iscsi://example.org:6000/iqn.1992-01.com.example/1,format=raw,\
if=virtio \
diff --git a/tests/qemuargv2xmldata/qemuargv2xml-disk-drive-network-iscsi.xml b/tests/qemuargv2xmldata/qemuargv2xml-disk-drive-network-iscsi.xml
index 23542fa..694412b 100644
--- a/tests/qemuargv2xmldata/qemuargv2xml-disk-drive-network-iscsi.xml
+++ b/tests/qemuargv2xmldata/qemuargv2xml-disk-drive-network-iscsi.xml
@@ -16,7 +16,7 @@
<emulator>/usr/bin/qemu-system-i686</emulator>
<disk type='network' device='disk'>
<driver name='qemu' type='raw'/>
- <source protocol='iscsi' name='iqn.1992-01.com.example'>
+ <source protocol='iscsi' name='iqn.1992-01.com.example/0'>
<host name='example.org' port='6000'/>
</source>
<target dev='vda' bus='virtio'/>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi-lun.args b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi-lun.args
index b25f3a0..0fbfd9a 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi-lun.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi-lun.args
@@ -21,7 +21,7 @@ server,nowait \
-boot c \
-device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x3 \
-usb \
--drive file=iscsi://example.org:3260/iqn.1992-01.com.example,format=raw,\
+-drive file=iscsi://example.org:3260/iqn.1992-01.com.example/0,format=raw,\
if=none,id=drive-scsi0-0-0-0 \
-device scsi-block,bus=scsi0.0,channel=0,scsi-id=0,lun=0,\
drive=drive-scsi0-0-0-0,id=scsi0-0-0-0
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi.args b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi.args
index a1d93af..ed15fda 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi.args
@@ -19,7 +19,7 @@ server,nowait \
-no-acpi \
-boot c \
-usb \
--drive file=iscsi://example.org:6000/iqn.1992-01.com.example,format=raw,\
+-drive file=iscsi://example.org:6000/iqn.1992-01.com.example/0,format=raw,\
if=none,id=drive-virtio-disk0 \
-device virtio-blk-pci,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,\
id=virtio-disk0 \
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-lsi-iscsi.args b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-lsi-iscsi.args
index 43c555a..07ae9f5 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-lsi-iscsi.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-lsi-iscsi.args
@@ -22,7 +22,7 @@ server,nowait \
-usb \
-drive file=/dev/HostVG/QEMUGuest2,format=raw,if=none,id=drive-ide0-0-0 \
-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
--drive file=iscsi://example.org:3260/iqn.1992-01.com.example,if=none,\
+-drive file=iscsi://example.org:3260/iqn.1992-01.com.example/0,if=none,\
format=raw,id=drive-hostdev0 \
-device scsi-generic,bus=scsi0.0,scsi-id=4,drive=drive-hostdev0,id=hostdev0 \
-drive file=iscsi://example.org:3260/iqn.1992-01.com.example/1,if=none,\
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-virtio-iscsi.args b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-virtio-iscsi.args
index a78e309..d80c859 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-virtio-iscsi.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-virtio-iscsi.args
@@ -22,7 +22,7 @@ server,nowait \
-usb \
-drive file=/dev/HostVG/QEMUGuest2,format=raw,if=none,id=drive-ide0-0-0 \
-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
--drive file=iscsi://example.org:3260/iqn.1992-01.com.example,if=none,\
+-drive file=iscsi://example.org:3260/iqn.1992-01.com.example/0,if=none,\
format=raw,id=drive-hostdev0 \
-device scsi-generic,bus=scsi0.0,channel=0,scsi-id=2,lun=4,\
drive=drive-hostdev0,id=hostdev0 \
--
2.9.5
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