The block-attach command now returns 1 when fails. Update first test
case to expect return value 1 instead of 255.
The parser now doesn't generate output for default values. Remove them
from expected output.
According to 417e6b70 ("libxl: add option for discard support to xl disk
configuration"), the "discard=" variant is never supported, delete two
test cases with that variant.
Reported-by: Jim Fehlig <jfehlig@suse.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Tested-by: Jim Fehlig <jfehlig@suse.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Handle new boolean option discard/no-discard for disk configuration. It
is supposed to disable discard support if file based backing storage was
intentionally created non-sparse to avoid fragmentation of the file.
The option intended for the backend driver. A new boolean property
"discard-enable" is written to the backend node. An upcoming patch for
qemu will make use of this property. The kernel blkback driver may be
updated as well to disable discard for phy based backing storage.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
These are provided using the "script=" syntax described in
docs/misc/xl-disk-configuration.txt.
The existing hotplug scripts currently conflate two different
concepts, namely that of making a datapath available in the backend
domain (logging into iSCSI LUNs and the like) and that of actually
connecting that datapath to a Xen backend path (e.g. writing
"physical-device" node in xenstore to bring up blkback).
For this reason the script support implemented here is only supported
in conjunction with backendtype=phy.
Eventually we hope to rework the hotplug scripts to separate the to
concepts, but that is not 4.2 material.
In addition there are some other subtleties:
- Previously in the blktap case we would add "script = .../blktap" to
the backend flex array, but then jumped to the PHY case which added
"script = .../block" too. The block one takes precendence since it
comes second.
This was, accidentally, correct. The blktap script is for blktap1
devices and not blktap2 devices. libxl completely manages the
blktap2 side of things without resorting to hotplug scripts and
creates a blkback device directly. Therefore the "block" script is
always the correct one to call. Custom script are not supported in
this context.
- libxl should not write the "physical-device" node. This is the
responsibility of the block script. Writing the "physical-device"
node in libxl basically completely short-cuts the standard block
hotplug script which uses "physical-device" to know if it has run
already or not.
In the case of more complex scripts libxl cannot know the right
value to write here anyway, in particular the device may not exist
until after the script is called.
This change has the side effect of re-enabling the checks for
device sharing aspect of the default block script, which I have tested
and which now cause libxl to properly abort now that libxl properly
checks for hotplug script errors.
There is no sharing check for blktap2 since even if you reuse the
same vhd the resulting tap device is different. I would have preferred
to simply write the "physical-device" node for the blktap2 case but
the hotplug script infrastructure is not currently setup to handle
LIBXL__DEVICE_KIND_VBD
devices without a hotplug script (backendtype phy and tap both end
up as KIND_VBD). Changing this was more surgery than I was happy doing
for 4.2 and therefore I have simply hardcoded to the block script for
the LIBXL_DISK_BACKEND_TAP case.
- libxl__device_disk_set_backend running against a phy device with a
script cannot stat the device to check its properties since it may
not exist until the script is run. Therefore I have special cased
this in disk_try_backend to simply assume that backend == phy is
always ok if a script was
configured. Similarly the other backend types are always rejected
if a script was configured.
Note that the reason for implementing the default script behaviour
in device_disk_add instead of libxl__device_disk_setdefault is
because we need to be able to tell when the script was
user-supplied rather than defaulted by libxl in order to correctly
implement the above. The setdefault function must be idempotent so
we cannot simply update disk->script.
I suspect that for 4.3 a script member should be added to
libxl__device, this would also help in the case above of handling
devices with no script in a consistent manner. This is not 4.2
material.
- When the block script falls through and shells out to a block-$type
script it used to pass "$node" however the only place this was
assigned was in the remove+phy case (in which case it contains the
file:// derived /dev/loopN device), and in that case the script
exits without falling through to the block-$type case.
Since libxl never creates a type other than phy this never happens
in practice anyway and we now call the correct block-$type script
directly. But fix it up anyway since it is confusing.
- The block-nbd and block-enbd scripts which we supply appear to be
broken WRT the hotplug calling convention, in that they seem to
expect a command line parameter (perhaps the $node described above)
rather than reading the appropriate node from xenstore.
I rather suspect this was broken by 7774:e2e7f47e6f79 in November
2005. I think it is safe to say no one is using these scripts! I
haven't fixed this here. It would be good to track down some working
scripts and either incorproate them or defer to them in their existing
home (e.g. if they live somewhere useful like the nbd tools
package).
- Added a few block script related entries to check-xl-disk-parse
from http://backdrift.org/xen-block-iscsi-script-with-multipath-support
and http://lists.linbit.com/pipermail/drbd-user/2008-September/010221.html /
http://www.drbd.org/users-guide-emb/s-xen-configure-domu.html (and
snuck in another interesting empty CDROM case)
This highlighted two bugs in the libxlu disk parser handling of the
deprecated "<script>:" prefix:
- It was failing to prefix with "block-" to construct the actual
script name
- The regex for matching iscsi or drdb or e?nbd was incorrect
- Use libxl__abs_path for the nic script too. Just because the
existing code nearly tricked me into repeating the mistake
I have tested with a custom block script which uses "lvchange -a" to
dynamically add remove the referenced device (simulates iSCSI
login/logout without requiring me to faff around setting up an iSCSI
target). I also tested on a blktap2 system.
I haven't directly tested anything more complex like iscsi: or nbd:
other than what check-xl-disk-parse exercises.
[ Recommit of correct version of 25727:a8d708fcb347, which was mangled
during commit. Sorry. -iwj ]
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
These are provided using the "script=" syntax described in
docs/misc/xl-disk-configuration.txt.
The existing hotplug scripts currently conflate two different
concepts, namely that of making a datapath available in the backend
domain (logging into iSCSI LUNs and the like) and that of actually
connecting that datapath to a Xen backend path (e.g. writing
"physical-device" node in xenstore to bring up blkback).
For this reason the script support implemented here is only supported
in conjunction with backendtype=phy.
Eventually we hope to rework the hotplug scripts to separate the to
concepts, but that is not 4.2 material.
In addition there are some other subtleties:
- Previously in the blktap case we would add "script = .../blktap" to
the backend flex array, but then jumped to the PHY case which added
"script = .../block" too. The block one takes precendence since it
comes second.
This was, accidentally, correct. The blktap script is for blktap1
devices and not blktap2 devices. libxl completely manages the
blktap2 side of things without resorting to hotplug scripts and
creates a blkback device directly. Therefore the "block" script is
always the correct one to call. Custom script are not supported in
this context.
- libxl should not write the "physical-device" node. This is the
responsibility of the block script. Writing the "physical-device"
node in libxl basically completely short-cuts the standard block
hotplug script which uses "physical-device" to know if it has run
already or not.
In the case of more complex scripts libxl cannot know the right
value to write here anyway, in particular the device may not exist
until after the script is called.
This change has the side effect of re-enabling the checks for
device sharing aspect of the default block script, which I have tested
and which now cause libxl to properly abort now that libxl properly
checks for hotplug script errors.
There is no sharing check for blktap2 since even if you reuse the
same vhd the resulting tap device is different. I would have preferred
to simply write the "physical-device" node for the blktap2 case but
the hotplug script infrastructure is not currently setup to handle
LIBXL__DEVICE_KIND_VBD
devices without a hotplug script (backendtype phy and tap both end
up as KIND_VBD). Changing this was more surgery than I was happy doing
for 4.2 and therefore I have simply hardcoded to the block script for
the LIBXL_DISK_BACKEND_TAP case.
- libxl__device_disk_set_backend running against a phy device with a
script cannot stat the device to check its properties since it may
not exist until the script is run. Therefore I have special cased
this in disk_try_backend to simply assume that backend == phy is
always ok if a script was
configured. Similarly the other backend types are always rejected
if a script was configured.
Note that the reason for implementing the default script behaviour
in device_disk_add instead of libxl__device_disk_setdefault is
because we need to be able to tell when the script was
user-supplied rather than defaulted by libxl in order to correctly
implement the above. The setdefault function must be idempotent so
we cannot simply update disk->script.
I suspect that for 4.3 a script member should be added to
libxl__device, this would also help in the case above of handling
devices with no script in a consistent manner. This is not 4.2
material.
- When the block script falls through and shells out to a block-$type
script it used to pass "$node" however the only place this was
assigned was in the remove+phy case (in which case it contains the
file:// derived /dev/loopN device), and in that case the script
exits without falling through to the block-$type case.
Since libxl never creates a type other than phy this never happens
in practice anyway and we now call the correct block-$type script
directly. But fix it up anyway since it is confusing.
- The block-nbd and block-enbd scripts which we supply appear to be
broken WRT the hotplug calling convention, in that they seem to
expect a command line parameter (perhaps the $node described above)
rather than reading the appropriate node from xenstore.
I rather suspect this was broken by 7774:e2e7f47e6f79 in November
2005. I think it is safe to say no one is using these scripts! I
haven't fixed this here. It would be good to track down some working
scripts and either incorproate them or defer to them in their existing
home (e.g. if they live somewhere useful like the nbd tools
package).
- Added a few block script related entries to check-xl-disk-parse
from http://backdrift.org/xen-block-iscsi-script-with-multipath-support
and http://lists.linbit.com/pipermail/drbd-user/2008-September/010221.html /
http://www.drbd.org/users-guide-emb/s-xen-configure-domu.html (and
snuck in another interesting empty CDROM case)
This highlighted two bugs in the libxlu disk parser handling of the
deprecated "<script>:" prefix:
- It was failing to prefix with "block-" to construct the actual
script name
- The regex for matching iscsi or drdb or e?nbd was incorrect
- Use libxl__abs_path for the nic script too. Just because the
existing code nearly tricked me into repeating the mistake
I have tested with a custom block script which uses "lvchange -a" to
dynamically add remove the referenced device (simulates iSCSI
login/logout without requiring me to faff around setting up an iSCSI
target). I also tested on a blktap2 system.
I haven't directly tested anything more complex like iscsi: or nbd:
other than what check-xl-disk-parse exercises.
[ reran flex/bison -iwj ]
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
xend accepts `,hdc:cdrom,r' as an empty CDROM drive. However this is
not consistent with the existing xl syntax in
docs/misc/xl-disk-configuration.txt which requires `,,hdc:cdrom,r'
(the additional positional paramter is the format).
We fix this by spotting the case specially: when the target is empty
and the format contains a colon, reinterpret the format as
<vdev>:<devtype>.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
The important change here is to xlu_disk_parse to correctly set format == EMPTY
for CDROM devices which are empty. Test cases are added which check for
correctness here.
xend accepts ',hdc:cdrom,r'[0] as an empty CDROM drive however this is not
consistent with the xl syntax in docs/misc/xl-disk-configuration.txt which
requires ',,hdc:cdrom,r' (the additional positional paramter is the format).
I'm not sure if/how this can be fixed. Note that xend does not accept
',,hdc:cdrom,r'
There are several incidental cleanups included the the cdrom-{insert,eject}
commands:
- add a dry-run mode
- use the non-deprecated disk specification syntax
- check for and report errors from libxl_cdrom_insert
[0] http://wiki.xen.org/wiki/CD_Rom_Support_in_Xen
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson.citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson.citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
I can't run from the current directory since my build box isn't running Xen so
if ./xl doesn't exist use the installed version on the assumption that I've
copied the script to a test host.
I think running from the build dir needs the blktap2 libraries, so update
LD_LIBRARY_PATH as appropriate.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson.citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
This runs "xl -N block-attach 0 <some strings>" for various sets of
strings and checks that the output is as expected.
Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Committed-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Wei Liu
Olaf Hering
Ian Campbell
Ian Jackson