https://bugzilla.redhat.com/show_bug.cgi?id=1025230
When determining whether a FS pool is mounted, rather than assuming that
the FS pool is mounted just because the target.path is in the mount list,
let's make sure that the FS pool source matches what is mounted
Refactor the code that builds the pool source string during the FS
storage pool mount to be a separate helper.
A future patch will use the helper in order to validate the mounted
FS matches the pool's expectation during poolCheck processing
The libvirt file system storage driver determines what file to
act on by concatenating the pool location with the volume name.
If a user is able to pick names like "../../../etc/passwd", then
they can escape the bounds of the pool. For that matter,
virStoragePoolListVolumes() doesn't descend into subdirectories,
so a user really shouldn't use a name with a slash.
Normally, only privileged users can coerce libvirt into creating
or opening existing files using the virStorageVol APIs; and such
users already have full privilege to create any domain XML (so it
is not an escalation of privilege). But in the case of
fine-grained ACLs, it is feasible that a user can be granted
storage_vol:create but not domain:write, and it violates
assumptions if such a user can abuse libvirt to access files
outside of the storage pool.
Therefore, prevent all use of volume names that contain "/",
whether or not such a name is actually attempting to escape the
pool.
This changes things from:
$ virsh vol-create-as default ../../../../../../etc/haha --capacity 128
Vol ../../../../../../etc/haha created
$ rm /etc/haha
to:
$ virsh vol-create-as default ../../../../../../etc/haha --capacity 128
error: Failed to create vol ../../../../../../etc/haha
error: Requested operation is not valid: volume name '../../../../../../etc/haha' cannot contain '/'
Signed-off-by: Eric Blake <eblake@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1276198
Prior to commit id '98322052' failure to saferead the block device would
cause an error to be logged and the device to be skipped while attempting
to discover/create a stable target path for a new LUN (NPIV).
This was because virStorageBackendSCSIFindLUs ignored errors from
processLU and virStorageBackendSCSINewLun.
Ignoring the failure allowed a multipath device with an "active" and
"ghost" to be present on the host with the "ghost" block device being
ignored. This patch will return a -2 to the caller indicating the desire
to ignore the block device since it cannot be used directly rather than
fail the pool startup.
I found this useful while processing a volume that wouldn't end up
showing up in the resulting list of block volumes. In this case, the
partition type wasn't found in the disk_types table.
Similar to the openflags VIR_STORAGE_VOL_OPEN_NOERROR processing, if some
read processing operation fails, check the readflags for the corresponding
error flag being set. If so, rather then causing an error - use VIR_WARN
to flag the error, but return -2 which some callers can use to perform
specific actions. Use a new VIR_STORAGE_VOL_READ_NOERROR flag in a new
VolReadErrorMode enum.
While processing the volume for lseek, virFileReadHeaderFD, and
virStorageFileGetMetadataFromBuf - failure would cause an error,
but ret would not be set. That would result in an error message being
sent, but successful status being returned.
Just so it's clearer what to expect upon input and what types of return
values could be generated. These were loosely copied from existing
virStorageBackendUpdateVolTargetInfoFD.
Similar to the openflags which allow VIR_STORAGE_VOL_OPEN_NOERROR to be
passed to avoid open errors, add a 'readflags' variable so that in the
future read failures could also be ignored.
https://bugzilla.redhat.com/show_bug.cgi?id=1282288
Rather than using just open on the path, allow for the possibility that
the path to be opened resides on an NFS root-squash target and was created
under a different uid/gid.
Without using virFileOpenAs an attempt to get the volume size data may fail
if the current user doesn't have permissions to read the volume, such as
would be the case if mode wasn't supplied in the volume XML and the default
VIR_STORAGE_DEFAULT_VOL_PERM_MODE (e.g. 0600) was used. Under this scenario
the owner/group is not root:root, thus this path run under root would fail
to open/read the volume.
NB: The virFileOpenAs code using OPEN_FORK will only work when the failure
is not EACESS/EPERM and the path resolves to a shared file system.
https://bugzilla.redhat.com/show_bug.cgi?id=1282288
Although commit id '77346f27' resolves part of the problem regarding creating
a qemu-img image in an NFS root-squash environment, it really didn't fix the
entire problem. Unfortunately it only masked the problem. It seems qemu-img
must open/create the image using 0644, which if used by target.perms would
result in the chmod not being called since the mode desired and set match.
Although qemu-img could conceivably ignore the mode when creating, libvirt
has more knowledge of the environment and can make the adjustment to the
mode far more easily by using virFileOpenAs with VIR_FILE_OPEN_FORCE_MODE.
If that's successful, then we know on return the file will have the right
owner and mode, so we can declare success
https://bugzilla.redhat.com/show_bug.cgi?id=1277781
The virStoragePoolFCRefreshThread had passed a pointer to the pool obj
in the virStoragePoolFCRefreshInfoPtr; however, we cannot assume that
the pool exists still since we don't keep the pool lock throughout
the duration of the thread.
Therefore, instead of passing the pool obj pointer, pass the UUID of
the pool and perform a lookup. If found, then we can perform the
refresh using the locked pool obj pointer; otherwise, we just exit
the thread since the pool is now gone.
https://bugzilla.redhat.com/show_bug.cgi?id=1233003
Commit id 'fdda3760' only managed a symptom where it was possible to
create a file in a pool without libvirt's knowledge, so it was reverted.
The real fix is to have all the createVol API's which actually create
a volume (disk, logical, zfs) and the buildVol API's which handle the
real creation of some volume file (fs, rbd, sheepdog) manage deleting
any volume which they create when there is some sort of error in
processing the volume.
This way the onus isn't left up to the storage_driver to determine whether
the buildVol failure was due to some failure as a result of adjustments
made to the volume after creation such as getting sizes, changing ownership,
changing volume protections, etc. or simple a failure in creation.
Without needing to consider that the volume has to be removed, the
buildVol failure path only needs to remove the volume from the pool.
This way if a creation failed due to duplicate name, libvirt wouldn't
remove a volume that it didn't create in the pool target.
This reverts commit fdda37608a.
This commit only manages a symptom of finding a buildRet failure
where a volume was not listed in the pool, but someone created the
volume outside of libvirt in the pool being managed by libvirt.
After successfully returning from virFileOpenAs, if subsequent calls fail,
then we need to remove the file since our caller expects that failures after
creation will remove the created file.
After a successful qemu-img/qcow-create of the backing file, if we
fail to stat the file, change it owner/group, or mode, then the
cleanup path should remove the file.
Currently the code does not handle the NFS root squash environment
properly since if the file gets created, then the subsequent chmod
will fail in a root squash environment where we're creating a file
in the pool with qemu tools, such as seen via:
$ virsh vol-create-from $pool $file.xml file.img --inputpool $pool
assuming $file.xml is creating a file of "<format type='qcow2'"> from
an existing file.img in the pool of "<format type='raw'>".
This patch will utilize the virCommandSetUmask when creating the file
in the NETFS pool. The virCommandSetUmask API was added in commit id
'0e1a1a8c4', which was after the original code was developed in commit
id 'e1f27784' to attempt to handle the root squash environment.
Also, rather than blindly attempting to chmod, check to see if the
st_mode bits from the stat match what we're trying to set and only
make the chmod if they don't.
Also, a slight adjustment to the fallback algorithm to move the
virCommandSetUID/virCommandSetGID inside the if (!filecreated) since
they're only useful if we need to attempt to create the file again.
When a RBD volume has snapshots it can not be removed.
This patch introduces a new flag to force volume removal,
VIR_STORAGE_VOL_DELETE_WITH_SNAPSHOTS.
With this flag any existing snapshots will be removed prior to
removing the volume.
No existing mechanism in libvirt allowed us to pass such information,
so that's why a new flag was introduced.
Signed-off-by: Wido den Hollander <wido@widodh.nl>
We have macros for both positive and negative string matching.
Therefore there is no need to use !STREQ or !STRNEQ. At the same
time as we are dropping this, new syntax-check rule is
introduced to make sure we won't introduce it again.
Signed-off-by: Ishmanpreet Kaur Khera <khera.ishman@gmail.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1233003
Track when the logical volume was successfully created in order to
properly handle the call to virStorageBackendLogicalDeleteVol. It's
possible that the failure to create was because someone created an
LV in the pool outside of libvirt's knowledge. In this case, we don't
want to delete that LV. A subsequent or future refresh of the pool
will find the volume and cause an earlier failure
Signed-off-by: John Ferlan <jferlan@redhat.com>
Commit id '1b5685da' refactored the code to move buildvoldef inside
the buildVol conditional; however, the VIR_FREE of the memory was
left only when 'buildret' failed, thus we're leaking memory.
Signed-off-by: John Ferlan <jferlan@redhat.com>
As of commit id '155ca616' a 'refreshVol' is called after a buildVol
succeeds in storageVolCreateXML, thus a volStorageBackendSheepdogRefreshVolInfo
call in virStorageBackendSheepdogBuildVol is no longer necessary.
Additionally, the 'conn' parameter becomes unused.
Signed-off-by: John Ferlan <jferlan@redhat.com>
As of commit id '155ca616' a 'refreshVol' is called after the buildVol
succeeds in storageVolCreateXML, thus the volStorageBackendRBDRefreshVolInfo
call in virStorageBackendRBDBuildVol is no longer necessary.
Signed-off-by: John Ferlan <jferlan@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1256999
After creating a copy of the 'authdef' in a pool -> disk translation,
unconditionally clear the 'authType' in the resulting disk auth def
structure since that's used for a storage pool and not a disk. This
ensures virStorageAuthDefFormat will properly format the <auth> XML
for a <disk> (e.g. it won't have a <auth type='%s'.../>).
https://bugzilla.redhat.com/show_bug.cgi?id=1247987
Calculation of the extended and logical partition values for the disk
pool is complex. As the bz points out an extended partition should have
it's allocation initialized to 0 (zero) and keep the capacity as the size
dictated by the extents read. Then for each logical partition found,
adjust the allocation of the extended partition.
Finally, previous logic tried to avoid recalculating things if a logical
partition was deleted; however, since we now have special logic to handle
the allocation of the extended partition, just make life easier by reading
the partition table again - rather than doing the reverse adjustment.
https://bugzilla.redhat.com/show_bug.cgi?id=1251461
When 'starting' up a disk pool, we need to make sure the label on the
device is valid; otherwise, the followup refreshPool will assume the
disk has been properly formatted for use. If we don't find the valid
label, then refuse the start and give a proper reason.
Let's check to ensure we can find the Partition Table in the label
and that libvirt actually recognizes that type; otherwise, when we
go to read the partitions during a refresh operation we may not be
reading what we expect.
This will expand upon the types of errors or reason that a build
would fail, so we can create more direct error messages.
Modify virStorageBackendDiskValidLabel to add a 'writelabel' parameter.
While initially for the purpose of determining whether the label should
be written during DiskBuild, a future use during DiskStart could determine
whether the pool should be started using the label found. Augment the
error messages also to give a hint as to what someone may need to do
or why the command failed.
Create a new function virStorageBackendDiskValidLabel to handle checking
whether there is a label on the device and whether it's valid or not.
While initially for the purpose of determining whether the label can be
overwritten during DiskBuild, a future use during DiskStart could determine
whether the pool should be started using the label found.
https://bugzilla.redhat.com/show_bug.cgi?id=1233003
Although perhaps bordering on a don't do that type scenario, if
someone creates a volume in a pool outside of libvirt, then uses that
same name to create a volume in the pool via libvirt, then the creation
will fail and in some cases cause the same name volume to be deleted.
This patch will refresh the pool just prior to checking whether the
named volume exists prior to creating the volume in the pool. While
it's still possible to have a timing window to create a file after the
check - at least we tried. At that point, someone is being malicious.
Since commit e0139e3, we update the pool allocation with
the user-provided allocation values.
For qcow2, the allocation is ignored for volume building,
but we still subtracted it from pool's allocation.
This can result in interesting values if the user-provided
allocation is large enough:
Capacity: 104.71 GiB
Allocation: 109.13 GiB
Available: 16.00 EiB
We already do a VolRefresh on volume creation. Also refresh
the volume after creating and use the new value to update the pool.
https://bugzilla.redhat.com/show_bug.cgi?id=1163091
Similar to commit id '35847860', it's possible to attempt to create
a 'netfs' directory in an NFS root-squash environment which will cause
the 'vol-delete' command to fail. It's also possible error paths from
the 'vol-create' would result in an error to remove a created directory
if the permissions were incorrect (and disallowed root access).
Thus rename the virFileUnlink to be virFileRemove to match the C API
functionality, adjust the code to following using rmdir or unlink
depending on the path type, and then use/call it for the VIR_STORAGE_VOL_DIR
Commit id '155ca616' added the 'refreshVol' API. In an NFS root-squash
environment it was possible that if the just created volume from XML wasn't
properly created with the right uid/gid and/or mode, then the followup
refreshVol will fail to open the volume in order to get the allocation/
capacity values. This would leave the volume still on the server and
cause a libvirtd crash because 'voldef' would be in the pool list, but
the cleanup code would free it.
Commit id '7c2d65dde2' changed the default value of mode to be -1 if not
supplied in the XML, which should cause creation of the volume using the
default mode of VIR_STORAGE_DEFAULT_VOL_PERM_MODE; however, the check
made was whether mode was '0' or not to use default or provided value.
This patch fixes the issue to check if the 'mode' was provided in the XML
and use that value.
In an NFS root-squashed environment the 'vol-delete' command will fail to
'unlink' the target volume since it was created under a different uid:gid.
This code continues the concepts introduced in virFileOpenForked and
virDirCreate[NoFork] with respect to running the unlink command under
the uid/gid of the child. Unlike the other two, don't retry on EACCES
(that's why we're here doing this now).
While a zero allocation in safezero should be fine it isn't when we use
posix_fallocate which returns EINVAL on a zero allocation.
While we could skip the zero allocation in safezero_posix_fallocate it's
an optimization to do it for all allocations.
This fixes vm installation via virtinst for me which otherwise aborts
like:
Starting install...
Retrieving file linux... | 5.9 MB 00:01 ...
Retrieving file initrd.gz... | 29 MB 00:07 ...
ERROR Couldn't create storage volume 'virtinst-linux.sBgds4': 'cannot fill file '/var/lib/libvirt/boot/virtinst-linux.sBgds4': Invalid argument'
The error was introduced by e30297b0 as spotted by Chunyan Liu
In commit 155ca616e, a change was introduced that no longer allowed defining
volumes via XML with a capacity of '0'. Because we check for info.size_arg
to be non-zero, this use-case fails. This patch allows info.size_arg to be
zero if no backing store is specified.
Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
Currently, when trying to virsh pool-define/virsh pool-build a new
'dir' pool, if the target directory already exists, virsh
pool-build/virStoragePoolBuild will error out. This is a change of
behaviour compared to eg libvirt 1.2.13
This is caused by the wrong type being used for the dir_create_flags
variable in virStorageBackendFileSystemBuild , it's defined as a bool
but is used as a flag bit field so should be unsigned int (this matches
the type virDirCreate expects for this variable).
This should fix https://bugzilla.gnome.org/show_bug.cgi?id=752417 (GNOME
Boxes) and https://bugzilla.redhat.com/show_bug.cgi?id=1244080
(downstream virt-manager).
Resolving an error reporting bug introduced by commit id '761491e' which
just took the return of virStorageBackendRBDCreateImage and used it as
the basis for the message generated. This would generate EPERM regardless
of error seen.
We used to look at the librbd code version and depending on that
we would invoke rbd_create3() or rbd_create().
Since librbd version 0.67.9 we can however tell RBD that it should
create rbd format 2 images even if we invoke rbd_create().
The less options we pass to librbd, the more we can lean on the sane
defaults it uses.
For rbd_create3() we had things like the stripe count and unit hardcoded
in libvirt and that might cause problems down the road.
Signed-off-by: Wido den Hollander <wido@widodh.nl>
When virsh vol-clone is attempted on a raw file where capacity > allocation,
the resulting cloned volume has a size that matches the virtual-size of
the parent; in place of matching its actual, disk size.
This patch fixes the cloned disk to have same _allocated_size_ as
the parent file from which it was cloned.
Ref: http://www.redhat.com/archives/libvir-list/2015-May/msg00050.html
Also fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1130739
Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Instead of storing the remaining bytes, store the position of the first
unallocated byte. This will allow changing the amount of bytes copied
by virStorageBackendCopyToFD without changing the safezero call.
No functional impact.
This patch reverts commit 4749d82a which tried to tweak the logic in
volume creation. We did realloc and update our object list before we executed
volume building within a specific storage backend. If that failed, we
had to update (again) our object list to the original state as it was before the
build and delete the volume from the pool (even though it didn't exist - this
truly depends on the backend).
I misunderstood the base idea to be able to poll the status of the volume
creation using vol-info. After commit 4749d82a this wasn't possible
anymore, although no BZ has been reported yet.
Commit 4749d82a also claimed to fix
https://bugzilla.redhat.com/show_bug.cgi?id=1223177, but commit c8be606b of the
same series as 4749d82ad (which was more of a refactor than a fix)
fixes the same issue so the revert should be pretty straightforward.
Further more, BZ https://bugzilla.redhat.com/show_bug.cgi?id=1241454 can be
fixed with this revert.
Commit 2a31c5f0 introduced support for storage pool state XMLs, however
it also introduced a regression:
if (!virstoragePoolObjIsActive(pool)) {
virStoragePoolObjUnlock(pool);
continue;
}
The idea behind this was that since we've got state XMLs and the pool
wasn't marked as active by autostart routine (if the autostart flag had been
set earlier), the pool is inactive and we can leave it be and continue with
other pools. However, filesystem type pools like fs,dir, possibly netfs are
supposed to be active if the filesystem is mounted on the host. And this is
exactly where the regression occurs, e.g. pool type 'dir' which has been
previously destroyed and marked as !autostart gets filtered out
by the condition above.
The resolution should be simply to remove the condition completely,
all pools will get their 'active' flag updated by check callback and if
they do not support such callback, the logic doesn't change and such
pools will be inactive by default (e.g. RBD, even if a state XML exists).
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1238610
https://bugzilla.redhat.com/show_bug.cgi?id=1230664
Per the devmapper docs, use "/dev/mapper" or "/dev/dm-n" in order to
determine if a device is under control of DM Multipath.
So add "/dev/mapper" to the virFileExists, leaving the "/dev/mpath"
as a "legacy" option since it appears for a while it was the preferred
mechanism, but is no longer maintained
Libvirt periodically refreshes all volumes in a storage pool, including
the volumes being cloned.
While cloning a storage volume from parent, we drop pool locks. Subsequent
volume refresh sometimes changes allocation for an ongoing copy, and leads
to corrupt images.
Fix: Introduce a shadow volume that isolates the volume object under refresh
from the base which has a copy ongoing.
Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1227664
If the requested format type for the new entry in the file system pool
is a 'dir', then be sure to set the vol->type correctly as would be done
when the pool is refreshed.
Related to :
https://bugzilla.redhat.com/show_bug.cgi?id=1171933
Rather than ignore the return status from virStorageBackendSCSIFindLUs,
cause a failure to start the pool if a -1 is returned. Issue was noted
during testing of the bz for iscsi that 'scsi' and 'fc' pools don't fail.
Commit id '832a9256' adjusted the code to recognize when the default
type of "unknown" was provided as the format type and to use "dos" if
found. Since the pool is built with "dos" and it could cause some
confusion when formatting the XML after building by seeing "unknown"
in the output, let's just adjust the pool's setting to "dos" so that
subsequent formats will see the value.
https://bugzilla.redhat.com/show_bug.cgi?id=1224233
Currently it's not possible to determine the difference between a
fatal memory allocation or failure to open/read the directory error
with a perhaps less fatal, I didn't find the "block" device in the
directory (which may be a disk entry without a block device).
In the case of the latter, we shouldn't cause failure to continue
searching in the caller (virStorageBackendSCSIFindLUs), rather we
should allow trying reading the next directory entry.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1186969
When generating the path to the dir for a CIFS/Samba driver, the code
would generate a source path for the mount using "%s:%s" while the
mount.cifs expects to see "//%s/%s". So check for the cifsfs and
format the source path appropriately.
Additionally, since there is no means to authenticate, the mount
needs a "-o guest" on the command line in order to anonymously mount
the Samba directory.
In order for the glusterfs boolean to be set, the pool->def->type must be
VIR_STORAGE_POOL_NETFS, thus the check within virCommandNewArgList whether
pool->def->type is VIR_STORAGE_POOL_FS will never be true, so remove it
Instead of initializing return value to zero (success) and overwriting
it on every failure just before the control jumps onto 'out' label,
let's initialize to an error value and set to zero only when we are
sure about the success. Just follow the pattern we have in the rest of
the code.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Instead of initializing return value to zero (success) and overwriting
it on every failure just before the control jumps onto 'out' label,
let's initialize to an error value and set to zero only when we are
sure about the success. Just follow the pattern we have in the rest of
the code.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1225694
Check if the disk partition to be wiped is the extended partition, if
so then disallow it. Do this via changing the wipeVol backend to check
the volume before passing to the common virStorageBackendVolWipeLocal
https://bugzilla.redhat.com/show_bug.cgi?id=1200206
Commit id '1b4eaa61' added the ability to have a mode='direct' for
an iscsi disk volume. It relied on virStorageTranslateDiskSourcePool
in order to copy any disk source pool authentication information to
the direct disk volume, but it neglected to also copy the 'secrettype'
field which ends up being used in the domain volume formatting code.
Adding a secrettype for this case will allow for proper formatting later
and allow disk snapshotting to work properly
Additionally libvirtd restart processing would fail to find the domain
since the translation processing code is run after domain xml processing,
so handle the the case where the authdef could have an empty secrettype
field when processing the auth and additionally ignore performing the
actual and expected auth secret type checks for a DISK_VOLUME since that
data will be reassembled later during translation processing of the
running domain.
https://bugzilla.redhat.com/show_bug.cgi?id=1181087
The virStorageBackendFileSystemIsMounted is called from three source paths
checkPool, startPool, and stopPool. Both start and stop validate the FS
fields before calling *IsMounted; however the check path there is no call.
This could lead the code into returning a true in "isActive" if for some
reason the target path for the pool was mounted. The assumption being
that if it was mounted, then we believe we started/mounted it.
It's also of note that commit id '81165294' added an error message for
the start/mount path regarding that the target is already mounted so
fail the start. That check was adjusted by commit id '13fde7ce' to
only message if actually mounted.
At one time this led to the libvirtd restart autostart code to declare
that the pool was active even though the startPool would inhibit startup
and the stopPool would inhibit shutdown. The autostart path changed as
of commit id '2a31c5f0' as part of the keep storage pools started between
libvirtd restarts.
This patch adds the same check made prior to start/mount and stop/unmount
to ensure we have a valid configuration before attempting to see if the
target is already mounted to declare "isActive" or not. Finding an improper
configuration will now cause an error at checkPool, which should make it
so we can no longer be left in a situation where the pool was started and
we have no way to stop it.
https://bugzilla.redhat.com/show_bug.cgi?id=1181087
Currently the assumption on the error message is that there are
no source device paths defined when the number of devices check
fails, but in reality the XML could have had none or it could have
had more than the value supported. Adjust the error message accordingly
to make it clearer what the error really is.
We do update pool volume object list before we actually create any
volume. If buildVol fails, we then try to delete the volume in the
storage as well as remove it from our structures. The problem is, that
any backend that supports both buildVol and deleteVol would fail in this
case which is completely unnecessary. This patch causes the update to
take place after we know a volume has been created successfully, thus no
removal in case of a buildVol failure is necessary.
https://bugzilla.redhat.com/show_bug.cgi?id=1223177
https://bugzilla.redhat.com/show_bug.cgi?id=1224018
The disk pool recalculates the pool allocation, capacity, and available
values each time through processing a newly created disk partition. This
created an issue with the allocation setting since the code used is shared
with the refresh path. Each path calls virStorageBackendDiskReadPartitions
which initializes the pool values and then processes the partition table
from the 'libvirt_parthelper' utility output with the only difference being
create passes a specific volume to be processed while refresh pass a NULL
indicating to process all volumes. That passed volume is check during the
virStorageBackendDiskMakeVol call to see if the current partition described
by the volume key already exists. If it exists, then no adjustments are
made to the allocation and the next entry in the output is checked.
For the create path this resulted in only the most recently created
partition size would be accounted for in the 'allocation' setting. This
patch thus checks whether the incoming volume is NULL before clearing
the pool allocation value.
Commit id '2ac0e647' for https://bugzilla.redhat.com/show_bug.cgi?id=1206521
was meant to be a generic check for the CreateVol, CreateVolFrom, and
DeleteVol paths to check if the storage backend's changed the pool's view
of allocation or available values.
Unfortunately as it turns out this caused a side effect when the disk backend
created an extended partition there would be no actual storage removed from
the pool, thus the changes would not find any change in allocation or
available and incorrectly update the pool values using the size of the
extended partition. A subsequent refresh of the pool would reset the
values appropriately.
This patch modifies those checks in order to specifically not update the
pool allocation and available for only the disk backend rather than be
generic before and after checks.
This never worked.
In 0.9.10 when this API was introduced, it was intended that
the SHRINK flag combined with DELTA would shrink the volume by
the specified capacity (to avoid passing negative numbers).
See commit 055bbf4.
When the SHRINK flag was finally implemented for the first backend
in 1.2.13 (commit aa9aa6a), it was only implemented for the absolute
values and with the delta flag the volume is always extended,
regardless of the SHRINK flag.
Treat the SHRINK flag as a minus sign when used together with DELTA,
to allow shrinking volumes as was documented in the API since 0.9.10.
https://bugzilla.redhat.com/show_bug.cgi?id=1220213
Since shrinking a volume below existing allocation is not allowed,
it is not possible for a successful resize with VOL_RESIZE_ALLOCATE
to increase the pool's available value.
Even with the SHRINK flag it is possible to extend the current
allocation or even the capacity. Remove the overflow when
computing delta with this flag and do the check even if the
flag was specified.
https://bugzilla.redhat.com/show_bug.cgi?id=1073305
The code already exists there, it just modified different flags. I just
noticed this when looking at the code. This patch is better to view
with bigger context or '-W'.
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Only set directory permissions at pool build time, if:
- User explicitly requested a mode via the XML
- The directory needs to be created
- We need to do the crazy NFS root-squash workaround
This allows qemu:///session to call build on an existing directory
like /tmp.
The XML parser sets a default <mode> if none is explicitly passed in.
This is then used at pool/vol creation time, and unconditionally reported
in the XML.
The problem with this approach is that it's impossible for other code
to determine if the user explicitly requested a storage mode. There
are some cases where we want to make this distinction, but we currently
can't.
Handle <mode> parsing like we handle <owner>/<group>: if no value is
passed in, set it to -1, and adjust the internal consumers to handle
it.
Coverity points out it's possible for one of the virCommand{Output|Error}*
API's to have not allocated 'output' and/or 'error' in which case the
strstr comparison will cause a NULL deref
Signed-off-by: John Ferlan <jferlan@redhat.com>
Just as we allow stopping filesystem pools when they were unmounted
externally, do not fail to stop an iscsi pool when someone else
closed the session externally.
Reported at:
https://bugzilla.redhat.com/show_bug.cgi?id=1171984
Trying to use qemu:///session to create a storage pool pointing at
/tmp will usually fail with something like:
$ virsh pool-start tmp
error: Failed to start pool tmp
error: cannot open volume '/tmp/systemd-private-c38cf0418d7a4734a66a8175996c384f-colord.service-kEyiTA': Permission denied
If any volume in an FS pool can't be opened by the daemon, the refresh
fails, and the pool can't be used.
This causes pain for virt-install/virt-manager though. Imaging a user
downloads a disk image to /tmp. virt-manager wants to import /tmp as
a storage pool, so we can detect what disk format it is, and set the
XML correctly. However this case will likely fail as explained above.
Change the logic here to skip volumes that fail to open. This could
conceivably cause user complaints along the lines of 'why doesn't
libvirt show $ROOT-OWNED-VOLUME-FOO', but figuring that currently
the pool won't even startup, I don't think there are any current
users that care about that case.
https://bugzilla.redhat.com/show_bug.cgi?id=1103308
If you end up with a state file for a pool that no longer starts up
or refreshes correctly, the state file is never removed and adds
noise to the logs everytime libvirtd is started.
If the initial state syncing fails, delete the statefile.
After pool startup we call refreshPool(). If that fails, we leave
a stale pool state file hanging around.
Hit this trying to create a pool with qemu:///session containing
root owned files.
https://bugzilla.redhat.com/show_bug.cgi?id=1171933
Adjust the processLU error returns to be a bit more logical. Currently,
the calling code cannot determine the difference between a non disk/lun
volume and a processed/found disk/lun. It can also not differentiate
between perhaps real/fatal error and one that won't necessarily stop
the code from finding other volumes.
After this patch virStorageBackendSCSIFindLUsInternal will stop processing
as soon as a "fatal" message occurs rather than continuting processing
for no apparent reason. It will also only set the *found value when
at least one of the processLU's was successful.
With the failed return, if the reason for the stop was that the pool
target path did not exist, was /dev, was /dev/, or did not start with
/dev, then iSCSI pool startup and refresh will fail.
Rather than passing/returning a pointer to a boolean to indicate that
perhaps we should try again - adjust the return of the call to return
the count of LU's found during processing, then let the caller decide
what to do with that value.
Use virStorageBackendPoolUseDevPath API to determine whether creation of
stable target path is possible for the volume.
This will differentiate a failed virStorageBackendStablePath which won't
need to be fatal. Thus, we'll add a -2 return value to differentiate that
the failure was a result of either the inability to find the symlink for
the device or failure to open the target path directory
For virStorageBackendStablePath, in order to make decisions in other code
split out the checks regarding whether the pool's target is empty, using /dev,
using /dev/, or doesn't start with /dev
https://bugzilla.redhat.com/show_bug.cgi?id=1206521
If the backend driver updates the pool available and/or allocation values,
then the storage_driver VolCreateXML, VolCreateXMLFrom, and VolDelete APIs
should not change the value; otherwise, it will appear as if the values
were "doubled" for each change. Additionally since unsigned arithmetic will
be used depending on the size and operation, either or both values could be
appear to be much larger than they should be (in the EiB range).
Currently only the disk pool updates the values, but other pools could.
Assume a "fresh" disk pool of 500 MiB using /dev/sde:
$ virsh pool-info disk-pool
...
Capacity: 509.88 MiB
Allocation: 0.00 B
Available: 509.84 MiB
$ virsh vol-create-as disk-pool sde1 --capacity 300M
$ virsh pool-info disk-pool
...
Capacity: 509.88 MiB
Allocation: 600.47 MiB
Available: 16.00 EiB
Following assumes disk backend updated to refresh the disk pool at deletion
of primary partition as well as extended partition:
$ virsh vol-delete --pool disk-pool sde1
Vol sde1 deleted
$ virsh pool-info disk-pool
...
Capacity: 509.88 MiB
Allocation: 9.73 EiB
Available: 6.27 EiB
This patch will check if the backend updated the pool values and honor that
update.
Commit id '471e1c4e' only considered updating the pool if the extended
partition was removed. As it turns out removing a primary partition
would also need to update the freeExtent list otherwise the following
sequence would fail (assuming a "fresh" disk pool for /dev/sde of 500M):
$ virsh pool-info disk-pool
...
Capacity: 509.88 MiB
Allocation: 0.00 B
Available: 509.84 MiB
$ virsh vol-create-as disk-pool sde1 --capacity 300M
$ virsh vol-delete --pool disk-pool sde1
$ virsh vol-create-as disk-pool sde1 --capacity 300M
error: Failed to create vol sde1
error: internal error: no large enough free extent
$
This patch will refresh the pool, rereading the partitions, and
return
https://bugzilla.redhat.com/show_bug.cgi?id=1073305
When creating a volume in a pool, the creation allows the 'capacity'
value to be larger than the available space in the pool. As long as
the 'allocation' value will fit in the space, the volume will be created.
However, resizing the volume checks were made with the new absolute
capacity value against existing capacity + the available space without
regard for whether the new absolute capacity was actually allocating
space or not. For example, a pool with 75G of available space creates
a volume of 10G using a capacity of 100G and allocation of 10G will succeed;
however, if the allocation used a capacity of 10G instead and then tried
to resize the allocation to 100G the code would fail to allow the backend
to try the resize.
Furthermore, when updating the pool "available" and "allocation" values,
the resize code would just "blindly" adjust them regardless of whether
space was "allocated" or just "capacity" was being adjusted. This left
a scenario whereby a resize to 100G would fail; however, a resize to 50G
followed by one to 100G would both succeed. Again, neither was adjusting
the allocation value, just the "capacity" value.
This patch adds more logic to the resize code to understand whether the
new capacity value is actually "allocating" space as well and whether it
shrinking or expanding. Since unsigned arithmatic is involved, the possibility
that we adjust the pool size values incorrectly is probable.
This patch also ensures that updates to the pool values only occur if we
actually performed the allocation.
NB: The storageVolDelete, storageVolCreateXML, and storageVolCreateXMLFrom
each only updates the pool allocation/availability values by the target
volume allocation value.
The 'checkPool' callback was originally part of the storageDriverAutostart function,
but the pools need to be checked earlier during initialization phase,
otherwise we can't start a domain which mounts a volume after the
libvirtd daemon restarted. This is because qemuProcessReconnect is called
earlier than storageDriverAutostart. Therefore the 'checkPool' logic has been
moved to storagePoolUpdateAllState which is called inside storageDriverInitialize.
We also need a valid 'conn' reference to be able to execute 'refreshPool'
during initialization phase. Though it isn't available until storageDriverAutostart
all of our storage backends do ignore 'conn' pointer, except for RBD,
but RBD doesn't support 'checkPool' callback, so it's safe to pass
conn = NULL in this case.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1177733
This patch introduces new virStorageDriverState element stateDir.
Also adds necessary changes to storageStateInitialize, so that
directories initialization becomes more generic.
If the call to virStorageBackendISCSIGetHostNumber failed, we set
retval = -1, but yet still called virStorageBackendSCSIFindLUs.
Need to add a goto cleanup - while at it, adjust the logic to
initialize retval to -1 and only changed to 0 (zero) on success.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Don't supercede the error message virStorageBackendSCSIFindLUs as the
message such as "error: Failed to find LUs on host 60: ..." is not overly
clear as to what the real problem might be.
Signed-off-by: John Ferlan <jferlan@redhat.com>
In order to be able to use 'checkPool' inside functions which do not
have any connection reference, 'conn' attribute needs to be discarded
from the checkPool's signature, since it's not used by any storage backend
anyway.
A helper that never returns an error and treats bits out of bitmap range
as false.
Use it everywhere we use ignore_value on virBitmapGetBit, or loop over
the bitmap size.
The virStorageBackendISCSIFindPoolSources API only needs the 'host' name
in order to discover iSCSI pools, it returns the various device paths.
On input, it's also possible to further restrict a search by providing the
port attribute for the host element and the (undocumented) initiator element.
For example:
$ virsh find-storage-pool-sources-as iscsi
error: Failed to find any iscsi pool sources
error: invalid argument: hostname and device path must be specified for iscsi sources
$ virsh find-storage-pool-sources-as iscsi 192.168.122.1
<sources>
<source>
<host name='192.168.122.1' port='3260'/>
<device path='iqn.2013-12.com.example:iscsi-chap-lclpool'/>
</source>
</sources>
https://bugzilla.redhat.com/show_bug.cgi?id=1181062
According to the formatstorage.html description for <source> element
and "format" attribute: "All drivers are required to have a default
value for this, so it is optional."
As it turns out the disk backend did not choose a default value, so I
added a default of "msdos" if the source type is "unknown" as well as
updating the storage.html backend disk volume driver documentation to
indicate the default format is dos.
Instead of just looking at the output of fstat, call
virStorageFileGetMetadata to get the full capacity from
image headers.
Note that the capacity is probed unconditionally. The updateCapacity
bool parameter is ignored and will be removed in the following commit.
In virStorageVolCreateXML, add VIR_VOL_XML_PARSE_NO_CAPACITY
to the call parsing the XML of the new volume to make the capacity
optional.
If the capacity is omitted, use the capacity of the old volume.
We already do that for values that are less than the original
volume capacity.
Not all files we want to find using virFileFindResource{,Full} are
generated when libvirt is built, some of them (such as RNG schemas) are
distributed with sources. The current API was not able to find source
files if libvirt was built in VPATH.
Both RNG schemas and cpu_map.xml are distributed in source tarball.
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
While the main storage driver code allows the flag
VIR_STORAGE_VOL_RESIZE_SHRINK to be set, none of the backend
drivers are supporting it. At the very least this can work
for plain file based volumes since we just ftruncate() them
to the new size. It does not work with qcow2 volumes, but we
can arguably delegate to qemu-img for error reporting for that
instead of second guessing this for ourselves:
$ virsh vol-resize --shrink /home/berrange/VirtualMachines/demo.qcow2 2G
error: Failed to change size of volume 'demo.qcow2' to 2G
error: internal error: Child process (/usr/bin/qemu-img resize /home/berrange/VirtualMachines/demo.qcow2 2147483648) unexpected exit status 1: qemu-img: qcow2 doesn't support shrinking images yet
qemu-img: This image does not support resize
See also https://bugzilla.redhat.com/show_bug.cgi?id=1021802
https://bugzilla.redhat.com/show_bug.cgi?id=1176510
When storageDriverAutostart is called path virStateReload via a 'service
libvirtd reload', then because the volume list in the pool wasn't cleared
prior to the call, each volume would be listed multiple times (as many
times as we reload). I believe the issue would be introduced by commit
id '9e093f0b' at least for the libvirtd reload path, although I suppose
the introduction of virStateReload (commit id '70da0494') could be a
different cause.
Thus like other places prior to calling refreshPool, we need to call
virStoragePoolObjClearVols
https://bugzilla.redhat.com/show_bug.cgi?id=1138516
If the provided volume name doesn't match what parted generated as the
partition name, then return a failure.
Update virsh.pod and formatstorage.html.in to describe the 'name' restriction
for disk pools as well as the usage of the <target>'s <format type='value'>.
When removing a volume that is the extended partition, all the logical
volume partitions that exist within the extended partition will also be
removed, so we need to refresh the pool to have the updated list
During virStorageBackendDiskMakeDataVol processing, if we find an extended
partition, then handle it specially when updating the capacity/allocation
rather than calling virStorageBackendUpdateVolInfo.
As it turns out, once a logical partition exists, any attempt to refresh
the pool or after libvirtd restart/reload will result in a failure to open
the extended partition device resulting in the inability to start the pool.
The downside to this is we will lose the <permissions> and <timestamps> for
the extended partition upon subsequent restart, refresh, reload since the
stat() in virStorageBackendUpdateVolTargetInfoFD will not be called. However,
since it's really only a container and shouldn't directly be used for
storage that seems reasonable.
Therefore, only use the existing code that already had a comment about
getting the allocation wrong for extended partitions for just the setting
of the extended partition data.
While checking the existing partitions in virStorageBackendDiskPartFormat,
the code would erroneously compare the volume target format type (eg, the
virStoragePartedFsType) rather than the source partition type (eg, the
virStorageVolTypeDisk) which is set during virStorageBackendDiskReadPartitions.
During virStorageBackendDiskCreateVol if virStorageBackendDiskReadPartitions
fails, then we were leaving with an error and a partition on the disk for
which there was no corresponding volume and used space on the disk which
could be reclaimable through direct parted activity. On a subsequent restart,
reload, or refresh the volume may magically appear too.
Move the API to before virStorageBackendDiskCreateVol in order to be
able to call the DeleteVol API when virStorageBackendDiskReadPartitions
fails so that we don't by chance leave a partition on the disk.
When creating a RAW file, we don't take advantage
of clone of btrfs.
Add a VIR_STORAGE_VOL_CREATE_REFLINK flag to request
a reflink copy.
Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
For stateless, client side drivers, it is never correct to
probe for secondary drivers. It is only ever appropriate to
use the secondary driver that is associated with the
hypervisor in question. As a result the ESX & HyperV drivers
have both been forced to do hacks where they register no-op
drivers for the ones they don't implement.
For stateful, server side drivers, we always just want to
use the same built-in shared driver. The exception is
virtualbox which is really a stateless driver and so wants
to use its own server side secondary drivers. To deal with
this virtualbox has to be built as 3 separate loadable
modules to allow registration to work in the right order.
This can all be simplified by introducing a new struct
recording the precise set of secondary drivers each
hypervisor driver wants
struct _virConnectDriver {
virHypervisorDriverPtr hypervisorDriver;
virInterfaceDriverPtr interfaceDriver;
virNetworkDriverPtr networkDriver;
virNodeDeviceDriverPtr nodeDeviceDriver;
virNWFilterDriverPtr nwfilterDriver;
virSecretDriverPtr secretDriver;
virStorageDriverPtr storageDriver;
};
Instead of registering the hypervisor driver, we now
just register a virConnectDriver instead. This allows
us to remove all probing of secondary drivers. Once we
have chosen the primary driver, we immediately know the
correct secondary drivers to use.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Remove the resize flag and use the same code path for all callers.
This flag was added by commit 18f0316 to allow virStorageFileResize
use 'safezero' while preserving the behavior.
Explicitly return -2 when a fallback to a different method should
be done, to make the code path more obvious.
Fail immediately when ftruncate fails in the mmap method,
as we did before commit 18f0316.
A recent lvm change has resulted in a change for the "default" type of
logical volume created when the "--virtualsize" or "--V" is supplied on
the command line (e.g. when the allocation and capacity values of a to
be created volume differ). It seems that at the very least the following
change adjusts the default type:
https://git.fedorahosted.org/cgit/lvm2.git/commit/?id=e0164f21
and the following may also have some impact.
https://git.fedorahosted.org/cgit/lvm2.git/commit/?id=87fc3b71
When using the virsh vol-create-as or vol-create xmlfile commands, the
result is that libvirt will now create a "thin logical volume" and a
"thin logical volume pool" rather than just a "thin snapshot logical
volume". For example the following sequence:
# lvcreate --name test -L 2M -V 5M lvm_test
Rounding up size to full physical extent 4.00 MiB
Rounding up size to full physical extent 8.00 MiB
Logical volume "test" created.
# lvs lvm_test
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lvol1 lvm_test twi-a-tz-- 4.00m 0.00 0.98
test lvm_test Vwi-a-tz-- 8.00m lvol1 0.00
compared to the former code which had the following:
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
test LVM_Test swi-a-s--- 4.00m [test_vorigin] 0.00
Since libvirt doesn't know how to parse the thin logical volume
and pool, it will fail to find the newly created volume and pool
even though it exists in the volume group.
It cannot find since the command used to find/parse returns a thin volume
'test' with no associated device, for example the output is:
lvol1##UgUwkp-fTFP-C0rc-ufue-xrYh-dkPr-FGPFPx#lvol1_tdata(0)#thin-pool#1#4194304#4194304#4194304#twi-a-tz--
test##NcaIoH-4YWJ-QKu3-sJc3-EOcS-goff-cThLIL##thin#0#8388608#4194304#8388608#Vwi-a-tz--
as compared to the former which had the following:
test#[test_vorigin]#Dt5Of3-4WE6-buvw-CWJ4-XOiz-ywOU-YULYw6#/dev/sda3(1300)#linear#1#4194304#4194304#4194304#swi-a-s---
While it's possible to generate code to handle the new thin lv and pool, this
patch will add a "--type snapshot" onto the lvcreate command libvirt uses
in order to "for now" be able to continue to utilize the thin snapshots
Currently virStorageFileResize() function uses build conditionals to
choose either the posix_fallocate() or syscall(SYS_fallocate) with no
fallback in order to preallocate the space in the newly resized file.
Since the safezero code has a similar set of conditionals modify the
resize and safezero code in order to allow the resize logic to make use
of safezero to unify the look/feel of the code paths.
Add a new boolean (resize) to safezero() to make the optional decision
whether to try syscall(SYS_fallocate) if the posix_fallocate fails because
HAVE_POSIX_FALLOCATE is not defined (eg, return -1 and errno == 0).
Create a local safezero_sys_fallocate in order to handle the resize
code paths that support that. If not present, the set errno = ENOSYS
in order to allow the caller to handle the failure scenarios.
Signed-off-by: John Ferlan <jferlan@redhat.com>
In old version of parted like parted-2.1-25, error message is shown in
stdout when printing a disk info without disk label.
Error: /dev/sda: unrecognised disk label
This line has been moved to stderr in newer version of parted. So we
should check both stdout and stderr when locating this message.
This should fix bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1172468
Signed-off-by: Hao Liu <hliu@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1087104#c5
When trying to use an invalid offset to virStorageVolUpload(), libvirt
fails in virFDStreamOpenFileInternal(), although it seems libvirt does
not check the return in storageVolUpload(), and calls
virFDStreamSetInternalCloseCb() right after. But stream doesn't have a
privateData (is NULL) yet, and the daemon crashes then.
0 0x00007f09429a9c10 in pthread_mutex_lock () from /lib64/libpthread.so.0
1 0x00007f094514dbf5 in virMutexLock (m=<optimized out>) at util/virthread.c:88
2 0x00007f09451cb211 in virFDStreamSetInternalCloseCb at fdstream.c:795
3 0x00007f092ff2c9eb in storageVolUpload at storage/storage_driver.c:2098
4 0x00007f09451f46e0 in virStorageVolUpload at libvirt.c:14000
5 0x00007f0945c78fa1 in remoteDispatchStorageVolUpload at remote_dispatch.h:14339
6 remoteDispatchStorageVolUploadHelper at remote_dispatch.h:14309
7 0x00007f094524a192 in virNetServerProgramDispatchCall at rpc/virnetserverprogram.c:437
Signed-off-by: Luyao Huang <lhuang@redhat.com>
While this could be exposed as a public API, it's not done yet as
there's no demand for that yet. Anyway, this is just preparing
the environment for easier volume creation on the destination.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Since virSecretFree will call virObjectUnref anyway, let's just use that
directly so as to avoid the possibility that we inadvertently clear out
a pending error message when using the public API.
Since virStoragePoolFree will call virObjectUnref anyway, let's just use that
directly so as to avoid the possibility that we inadvertently clear out
a pending error message when using the public API.
Since virStorageVolFree will call virObjectUnref anyway, let's just use that
directly so as to avoid the possibility that we inadvertently clear out
a pending error message when using the public API.
https://bugzilla.redhat.com/show_bug.cgi?id=1159180
The virStoragePoolSourceFindDuplicate only checks the incoming definition
against the same type of pool as the def; however, for "scsi_host" and
"fc_host" adapter pools, it's possible that either some pool "scsi_host"
adapter definition is already using the scsi_hostN that the "fc_host"
adapter definition wants to use or some "fc_host" pool adapter definition
is using a vHBA scsi_hostN or parent scsi_hostN that an incoming "scsi_host"
definition is trying to use.
This patch adds the mismatched type checks and adds extraneous comments
to describe what each check is determining.
This patch also modifies the documentation to be describe what scsi_hostN
devices a "scsi_host" source adapter should use and which to avoid. It also
updates the parent definition to specifically call out that for mixed
environments it's better to define which parent to use so that the duplicate
pool checks can be done properly.
https://bugzilla.redhat.com/show_bug.cgi?id=1159180
Move the API from the backend to storage_conf and rename it to
virStoragePoolGetVhbaSCSIHostParent. A future patch will need to
use this functionality from storage_conf
https://bugzilla.redhat.com/show_bug.cgi?id=1152382
When libvirt create's the vport (VPORT_CREATE) for the vHBA, there isn't
enough "time" between the creation and the running of the following
backend->refreshPool after a backend->startPool in order to find the LU's.
Population of LU's happens asynchronously when udevEventHandleCallback
discovers the "new" vHBA port. Creation of the infrastructure by udev
is an iterative process creating and discovering actual storage devices and
adjusting the environment.
Because of the time it takes to discover and set things up, the backend
refreshPool call done after the startPool call will generally fail to
find any devices. This leaves the newly started pool appear empty when
querying via 'vol-list' after startup. The "workaround" has always been
to run pool-refresh after startup (or any time thereafter) in order to
find the LU's. Depending on how quickly run after startup, this too may
not find any LUs in the pool. Eventually though given enough time and
retries it will find something if LU's exist for the vHBA.
This patch adds a thread to be executed after the VPORT_CREATE which will
attempt to find the LU's without requiring the external run of refresh-pool.
It does this by waiting for 5 seconds and searching for the LU's. If any
are found, then the thread completes; otherwise, it will retry once more
in another 5 seconds. If none are found in that second pass, the thread
gives up.
Things learned while investigating this... No need to try and fill the
pool too quickly or too many times. Over the course of creation, the udev
code may 'add', 'change', and 'delete' the same device. So if the refresh
code runs and finds something, it may display it only to have a subsequent
refresh appear to "lose" the device. The udev processing doesn't seem to
have a way to indicate that it's all done with the creation processing of a
newly found vHBA. Only the Lone Ranger has silver bullets to fix everything.
Fix a problem in the getBlockDevice and processLU where retval initialized
to zero causing some failures to erroneously continue through to the
virStorageBackendSCSINewLun with an attempt to find a path for "/dev/(null)".
This would fail approximately 10 seconds later with debug message:
virStorageBackendSCSINewLun:203 :
No stable path found for '/dev/(null)' in '/dev/disk/by-path'
The root cause of the issue is for many /sys/bus/scsi/devices/<lun path>
there is no "block*" device found for the vHBA's, where "<lun path>" are
the various paths created for the vHBA, such as "17:0:0:0", "17:0:1:0",
"17:0:2:0", "17:0:3:0", etc. If the block device isn't found, then the
directory should just be ignored rather than attempting to process it.
The bug was that in getBlockDevice the assumption was "block" would exist
and either getNewStyleBlockDevice or getOldStyleBlockDevice would fill in
@block_device. However, if 'block*' doesn't exist, then the code returned
NULL for block_device *and* a good (zero) retval value. This caused the
processLU code to attempt the virStorageBackendSCSINewLun which failed
"at some point in time" in the future.
After this change - on test system the refresh-pool didn't have a noticable
pause of about 20 seconds - it completed within a second since no longer
was there an attempt/need to find "/dev/(null)".
Additionally, the virStorageBackendSCSIFindLU's shouldn't be declaring
found unless the processLU actually returns success. This will be
important in the followup patch which relies on whether a LU was found.
https://bugzilla.redhat.com/show_bug.cgi?id=1160926
Introduce a 'managed' attribute to allow libvirt to decide whether to
delete a vHBA vport created via external means such as nodedev-create.
The code currently decides whether to delete the vHBA based solely on
whether the parent was provided at creation time. However, that may not
be the desired action, so rather than delete and force someone to create
another vHBA via an additional nodedev-create allow the configuration of
the storage pool to decide the desired action.
During createVport when libvirt does the VPORT_CREATE, set the managed
value to YES if not already set to indicate to the deleteVport code that
it should delete the vHBA when the pool is destroyed.
If libvirtd is restarted all the memory only state was lost, so for a
persistent storage pool, use the virStoragePoolSaveConfig in order to
write out the managed value.
Because we're now saving the current configuration, we need to be sure
to not save the parent in the output XML if it was undefined at start.
Saving the name would cause future starts to always use the same parent
which is not the expected result when not providing a parent. By not
providing a parent, libvirt is expected to find the best available
vHBA port for each subsequent (re)start.
At deleteVport, use the new managed value to decide whether to execute
the VPORT_DELETE. Since we no longer save the parent in memory or in
XML when provided, if it was not provided, then we have to look it up.
https://bugzilla.redhat.com/show_bug.cgi?id=1160926
Passing a copy of the storage pool adapter to a function just changes the
copy of the fields in the particular function and then when returning to
the caller those changes are discarded. While not yet biting us in the
storage clean-up case, it did cause an issue for the fchost storage pool
startup case, createVport. The issue was at startup, if no parent is found
in the XML, the code will search for the 'best available' parent and then
store that in the in memory copy of the adapter. Of course, in this case
it was a copy, so when returning to the virStorageBackendSCSIStartPool that
change was discarded (or lost) from the pool->def->source.adapter which
meant at shutdown (deleteVport), the code assumed no adapter was passed
and skipped the deletion, leaving the vHBA created by libvirt still defined
requiring an additional stop of a nodedev-destroy to remove.
Adjusted the createVport to take virStoragePoolDefPtr instead of the
adapter copy. Then use the virStoragePoolSourceAdapterPtr when processing.
A future patch will need the 'def' anyway, so this just sets up for that.
https://bugzilla.redhat.com/show_bug.cgi?id=1160565
The existing code assumed that the configuration of a 'parent' attribute
was correct for the createVport path. As it turns out, that may not be
the case which leads errors during the deleteVport path because the
wwnn/wwpn isn't associated with the parent.
With this change the following is reported:
error: Failed to start pool fc_pool_host3
error: XML error: Parent attribute 'scsi_host4' does not match parent 'scsi_host3' determined for the 'scsi_host16' wwnn/wwpn lookup.
for XML as follows:
<pool type='scsi'>
<name>fc_pool</name>
<source>
<adapter type='fc_host' parent='scsi_host4' wwnn='5001a4aaf3ca174b' wwpn='5001a4a77192b864'/>
</source>
Where 'nodedev-dumpxml scsi_host16' provides:
<device>
<name>scsi_host16</name>
<path>/sys/devices/pci0000:00/0000:00:04.0/0000:10:00.0/host3/vport-3:0-11/host16</path>
<parent>scsi_host3</parent>
<capability type='scsi_host'>
<host>16</host>
<unique_id>13</unique_id>
<capability type='fc_host'>
<wwnn>5001a4aaf3ca174b</wwnn>
<wwpn>5001a4a77192b864</wwpn>
...
The patch also adjusts the description of the storage pool to describe the
restrictions.
Signed-off-by: John Ferlan <jferlan@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1160565
If a 'parent' attribute is provided for the fchost, then at startup
time check to ensure it is a vport capable scsi_host. If the parent
is not vport capable, then disallow the startup. The following is the
expected results:
error: Failed to start pool fc_pool
error: XML error: parent 'scsi_host2' specified for vHBA is not vport capable
where the XML for the fc_pool is:
<pool type='scsi'>
<name>fc_pool</name>
<source>
<adapter type='fc_host' parent='scsi_host2' wwnn='5001a4aaf3ca174b' wwpn='5001a4a77192b864'/>
</source>
...
and 'scsi_host2' is not vport capable.
Providing an incorrect parent and a correct wwnn/wwpn could lead to
failures at shutdown (deleteVport) where the assumption is the parent
is for the fchost.
NOTE: If the provided wwnn/wwpn doesn't resolve to an existing scsi_host,
then we will be creating one with code (virManageVport) which
assumes the parent is vport capable.
Signed-off-by: John Ferlan <jferlan@redhat.com>
The shared storage driver is stateful and inside the daemon so
there is no need to use the storagePrivateData field to get the
driver handle. Just access the global driver handle directly.
Add a new parameter to virStorageFileGetMetadata that will break the
backing chain detection process and report useful error message rather
than having to use virStorageFileChainGetBroken.
This patch just introduces the option, usage will be provided
separately.
- Provide an implementation for buildPool and deletePool operations
for the ZFS storage backend.
- Add VIR_STORAGE_POOL_SOURCE_DEVICE flag to ZFS pool poolOptions
as now we can specify devices to build pool from
- storagepool.rng: add an optional 'sourceinfodev' to 'sourcezfs' and
add an optional 'target' to 'poolzfs' entity
- Add a couple of tests to storagepoolxml2xmltest
Coverity complains that when multiplying to 32 bit values that eventually
will be stored in a 64 bit value that it's possible the math could
overflow unless one of the values being multiplied is type cast to
the proper size.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Since cd4d547576
Coverity notes that setting 'ret = -3' prior to the unconditional
setting of 'ret = 0' will cause the value to be UNUSED.
Since the comment indicates that it is expect to allow the code
to continue, just remove the ret = -3 setting.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Currently, after calling commands to create a new volumes,
virStorageBackendZFSCreateVol calls virStorageBackendZFSFindVols that
calls virStorageBackendZFSParseVol.
virStorageBackendZFSParseVol checks if a volume already exists by
trying to get it using virStorageVolDefFindByName.
For a just created volume it returns NULL, so volume is reported as
new and appended to pool->volumes. This causes a volume to be listed
twice as storageVolCreateXML appends this new volume to the list as
well.
Fix that by passing a new volume definition to
virStorageBackendZFSParseVol so it could determine if it needs to add
this volume to the list.
There were two occurrances of attempting to initialize actualType by
calling virStorageSourceGetActualType(src) prior to a check if (!src)
resulting in Coverity complaining about the possible NULL dereference
in virStorageSourceGetActualType() of src.
Resolve by moving the actualType setting until after checking !src
virStorageBackendVolDownloadLocal and virStorageBackendVolUploadLocal
use virFDStreamOpenFile function to work with the volume fd.
virFDStreamOpenFile calls virFDStreamOpenFileInternal that implements
handling of the non-blocking I/O. If a file is not a character device and
not a fifo, it uses libvirt_iohelper.
On FreeBSD, it doesn't work as expected because disk devices (including
ZFS volumes) are exposed as character devices, and ZFS volumes do not
support open(2) with O_NONBLOCK.
To overcome this, introduce a forceIOHelper flag to
virFDStreamOpenFileInternal that forces using libvirt_iohelper. And
introduce virFDStreamOpenBlockDevice that calls
virFDStreamOpenFileInternal with the forceIOHelper set to true.
On some places in the libvirt code we have:
f(a,z)
instead of
f(a, z)
This trivial patch fixes couple of such occurrences.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Currently, qemu driver uses qemuTranslateDiskSourcePool()
to translate disk volume information. This function is
general enough and could be used for other drivers as well,
so move it to conf/domain_conf.c along with its helpers.
- qemuTranslateDiskSourcePool: move to storage/storage_driver.c
and rename to virStorageTranslateDiskSourcePool,
- qemuAddISCSIPoolSourceHost: move to storage/storage_driver.c
and rename to virStorageAddISCSIPoolSourceHost,
- qemuTranslateDiskSourcePoolAuth: move to storage/storage_driver.c
and rename to virStorageTranslateDiskSourcePoolAuth,
- Update users of qemuTranslateDiskSourcePool to use a
new name.
Implement ZFS storage backend driver. Currently supported
only on FreeBSD because of ZFS limitations on Linux.
Features supported:
- pool-start, pool-stop
- pool-info
- vol-list
- vol-create / vol-delete
Pool definition looks like that:
<pool type='zfs'>
<name>myzfspool</name>
<source>
<name>actualpoolname</name>
</source>
</pool>
The 'actualpoolname' value is a name of the pool on the system,
such as shown by 'zpool list' command. Target makes no sense
here because volumes path is always /dev/zvol/$poolname/$volname.
User has to create a pool on his own, this driver doesn't
support pool creation currently.
A volume could be used with Qemu by adding an entry like this:
<disk type='volume' device='disk'>
<driver name='qemu' type='raw'/>
<source pool='myzfspool' volume='vol5'/>
<target dev='hdc' bus='ide'/>
</disk>
https://bugzilla.redhat.com/show_bug.cgi?id=1072653
Upon successful upload of a volume, the target volume and storage pool
were not updated to reflect any changes as a result of the upload. Make
use of the existing stream close callback mechanism to force a backend
pool refresh to occur in a separate thread once the stream closes. The
separate thread should avoid potential deadlocks if the refresh needed
to wait on some event from the event loop which is used to perform
the stream callback.
Use correct mode when pre-creating files (for snapshots). The refactor
changing to storage driver usage caused a regression as some systems
created the file with 000 permissions forbidding qemu to write the file.
Pass mode to the creating functions to avoid the problem.
Regression since 185e07a5f8.
With my intended use of storage driver assist to chown files on remote
storage we will need a witness that will tell us whether the given
storage volume supports operations needed by the storage driver.
Gluster storage works on a similar principle to NFS where it takes the
uid and gid of the actual process and uses it to access the storage
volume on the remote server. This introduces a need to chown storage
files on gluster via native API.
virStorageBackendLogicalCreateVol contains a piece like:
if (vol->target.path != NULL) {
/* A target path passed to CreateVol has no meaning */
VIR_FREE(vol->target.path);
}
The 'if' is useless here, but 'syntax-check' doesn't catch that
because of the comment, so drop the 'if'.
If a parentaddr was provided in the XML, have getAdapterName lookup
the stable address. This allows virStorageBackendSCSICheckPool() and
virStorageBackendSCSIRefreshPool() to automagically find the scsi_host
by its PCI address and unique_id
Rather than assume that NOT FC_HOST is SCSI_HOST, let's call them out
specifically. Makes it easier to find SCSI_HOST code/structs and ensures
something isn't missed in the future
https://bugzilla.redhat.com/show_bug.cgi?id=1091866
Add a new boolean 'sparse'. This will be used by the logical backend
storage driver to determine whether the target volume is sparse or not
(also known by a snapshot or thin logical volume). Although setting sparse
to true at creation could be seen as duplicitous to setting during
virStorageBackendLogicalMakeVol() in case there are ever other code paths
between Create and FindLVs that need to know about the volume be sparse.
Use the 'sparse' in a new virStorageBackendLogicalVolWipe() to decide whether
to attempt to wipe the logical volume or not. For now, I have found no
means to wipe the volume without writing to it. Writing to the sparse
volume causes it to be filled. A sparse logical volume is not completely
writeable as there exists metadata which if overwritten will cause the
sparse lv to go INACTIVE which means pool-refresh will not find it.
Access to whatever lvm uses to manage data blocks is not provided by
any API I could find.
Coverity complains about the return value of ioctl not being checked.
Even though we carry on when this fails (just like qemu-img does),
we can log an error.
For non-local storage drivers we can't expect to use the "scrub" tool to
wipe the volume. Split the code into a separate backend function so that
we can add protocol specific code later.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1118710
The next patch will move the storage volume wiping code into the
individual backends. This patch splits out the common code to wipe a
local volume into a separate backend helper so that the next patch is
simpler.
Add 'nocow' to storage volume xml so that user can have an option
to set NOCOW flag to the newly created volume. It's useful on btrfs
file system to enhance performance.
Btrfs has low performance when hosting VM images, even more when the guest
in those VM are also using btrfs as file system. One way to mitigate this
bad performance is to turn off COW attributes on VM files. Generally, there
are two ways to turn off COW on btrfs: a) by mounting fs with nodatacow,
then all newly created files will be NOCOW. b) per file. Add the NOCOW file
attribute. It could only be done to empty or new files.
This patch tries the second way, according to 'nocow' option, it could set
NOCOW flag per file:
for raw file images, handle 'nocow' in libvirt code; for non-raw file images,
pass 'nocow=on' option to qemu-img, and let qemu-img to handle that (requires
qemu-img version >= 2.1).
Signed-off-by: Chunyan Liu <cyliu@suse.com>
When the backing store of a volume wasn't accessible while updating the
volume definition the call would fail altogether. In cases where we
currently (incorrectly) treat remote backing stores as local one this
might lead to strange errors.
Ignore the opening errors until we figure out how to track proper volume
metadata.
Use the backing store parser to properly create the information about a
volume's backing store. Unfortunately as the storage driver isn't
prepared to allow volumes backed by networked filesystems add a
workaround that will avoid changing the XML output.
For non-local storage drivers we can't expect to use the FDStream
backend for up/downloading volumes. Split the code into a separate
backend function so that we can add protocol specific code later.
