At present we return the volume connect error if the clone
from snapshot fails when rbdvolume is encrypted, which is incorrect.
This patch correctly return the failed copy encryption error to the
caller
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
Before RBD map operation, we do check the
watchers on the RBD image. In the case of
RWO volume. cephcsi makes sure only one
client is using the RBD image. If the rbd
image is mirrored, by default mirroring
daemon will add a watcher on the image
and as we are using go-ceph a watcher will
be added as we have opened the image So
we will have two watchers on an image if
mirroring is enabled. This holds when the
rbd mirror daemon is running, In case if
the mirror daemon is not running there will
be only one watcher on the rbd image
(which is placed by go-ceph image open)
we should not block the map operation if
the mirroring daemon is not running as
its Async mirroring. This commit adds a
check to make sure no more than 2 watchers
if the image is mirrored or no more than 1
watcher if it is not mirrored image.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Since rbdImage is a common struct for
rbdVolume and rbdSnapshot, it description
was matching to only snapshot.
This commit makes the comments generic for
both volumes and snapshots.
Signed-off-by: Yug <yuggupta27@gmail.com>
By default, the write buffer size in libfuse2 is 2KiB
`fuse_big_writes = true` option is used to override this limit.
This commit makes `fuse_big_writes = true` option as default
in ceph.conf.
Closes: #1928
Signed-off-by: Rakshith R <rar@redhat.com>
If the pool or few keys are missing in the omap.
GetImageAttributes function returns nil error message and few
empty items in imageAttributes struct. if the image is not
found and the entiries are missing use
the volumeId present on the PV annotation for further operations.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
incase if the image is promoted and demoted the
image state will be set to up+unknown if the image
on the remote cluster is still in demoted state.
when user changes the state from primary to secondary
and still the image is in demoted (secondary) state
in the remote cluster. the image state on both the cluster
will be on unknown state.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
It helps to get a stack trace when debugging issues. Certain things are
considered bugs in the code (like missing attributes in a struct), and
might cause a panic in certain occasions.
In this case, a missing string will not panic, but the behaviour will
also not be correct (DEKs getting encrypted, but unable to decrypt).
Clearly logging this as a BUG is probably better than calling panic().
Signed-off-by: Niels de Vos <ndevos@redhat.com>
It is possible that when a provisioner restarts after a snapshot was
cloned, but before the newly restored image had its encryption metadata
set, the new image is not marked as encrypted. This will prevent
attaching/mounting the image, as the encryption key will not be fetched,
or is not available in the DEKStore.
By actively repairing the encryption configuration when needed, this
problem should be addressed.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
buildCreateVolumeResponse() exists exactly for the need to create a
csi.CreateVolumeResponse based on an rbdVolume. Calling this helper
reduces the code duplication in CreateVolume().
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The rbdVolume that needs its encryption configured is constructed in the
Exists() method. It is suitable to move the copyEncryptionConfig() call
there as well, so that the object is completely constructed in a single
place.
Golang-ci:gocyclo complained about the increased complexity of the
Exists() function. Moving the repairing of the ImageID into its own
helper function makes the code a little easier to understand.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Introduce helper function cloneFromSnapshot() that takes care of the
procedures that are needed when an existing snapshot has been found.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
When a source volume is encrypted, the passphrase needs to be copied and
stored for the newly cloned volume.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Cloning volumes requires copying the DEK from the source to the newly
cloned volume. Introduce copyEncryptionConfig() as a helper for that.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The new StoreCryptoPassphrase() method makes it possible to store an
unencrypted passphrase newly encrypted in the DEKStore.
Cloning volumes will use this, as the passphrase from the original
volume will need to get copied as part of the metadata for the volume.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Without this, the rbdVolume can not connect to the Ceph cluster and
configure the (optional) encryption.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The ControllerServer should not need to care about support for
encryption, ideally it is transparantly handled by the rbdVolume type
and its internal API.
Deleting the DEK was one of the last remainders that was explicitly done
inside the ControllerServer.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
When the KMS configuration can not be found, it is useful to know what
configurations are available. This aids troubleshooting when typos in
the KMS ID are made.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Currently default ControllerGetCapabilities function is being
used which throws 'runtime error: invalid memory address or
nil pointer dereference' when `--controllerServer=true` is not
set in provisioner deployment args.
This commit adds a check to prevent it.
Fixes: 1925
Signed-off-by: Rakshith R <rar@redhat.com>
nolint directive needs to be followed by comma separated
list of linters. This commit changes to gocognit:gocyclo
which was not recognised to linters which show error for
the function.
Signed-off-by: Rakshith R <rar@redhat.com>
This commit appends stderr to error in both kernel and
ceph-fuse mounter functions to better be able to debug
errors.
Signed-off-by: Rakshith R <rar@redhat.com>
there can be a change we can reconcile same
PV parallelly we can endup in generating and
deleting multiple omap keys. to be on safer
side taking lock to process one volumeHandle
at a time.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
In the case of the Async DR, the volumeID will
not be the same if the clusterID or the PoolID
is different, With Earlier implementation, it
is expected that the new volumeID mapping is
stored in the rados omap pool. In the case of the
ControllerExpand or the DeleteVolume Request,
the only volumeID will be sent it's not possible
to find the corresponding poolID in the new cluster.
With This Change, it works as below
The csi-rbdplugin-controller will watch for the PV
objects, when there are any PV objects created it
will check the omap already exists, If the omap doesn't
exist it will generate the new volumeID and it checks for
the volumeID mapping entry in the PV annotation, if the
mapping does not exist, it will add the new entry
to the PV annotation.
The cephcsi will check for the PV annotations if the
omap does not exist if the mapping exists in the PV
annotation, it will use the new volumeID for further
operations.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Refactored deeply nested if statement in vault_tokens.go to
reduce cognitive complexity by adding fetchTenantConfig function.
Signed-off-by: Rakshith R <rar@redhat.com>
It seems that newer versions of some tools/libraries identify encrypted
filesystems with `crypto_LUKS` instead of `crypt`.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
In case of the DR the image on the primary site cannot be
demoted as the cluster is down, during failover the image need
to be force promoted. RBD returns `Device or resource busy`
error message if the image cannot be promoted for above reason.
Return FailedPrecondition so that replication operator can send
request to force promote the image.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
instead of fetching the force option from the
parameters. Use the Force field available in
the PromoteVolume Request.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
as the org github.com/kube-storage is renamed
to github.com/csi-addons as the name kube-storage
was more generic.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
The new Amazon Metadata KMS provider uses a CMK stored in AWS KMS to
encrypt/decrypt the DEK which is stored in the volume metadata.
Updates: #1921
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Amazon KMS expects a Secret with sensitive account and key information
in the Kubernetes Namespace where the Ceph-CSI Pods are running. It will
fetch the contents of the Secret itself.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
These functions can now be re-used easier. The Amazon KMS needs to know
the Namespace of the Pod for reading a Secret with more key/values.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Incase of resync the image will get deleted, gets
recreated and its a a time consuming operation.
It makes sense to return aborted error instead
of not found as we have omap data only the image
is missing in rbd pool.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Do resync if the image is in unknow or in error
state.
Check for the current image state for up+stopped
or up+replaying and also all peer site status
should be un up+stopped to confirm that resyncing
is done and image can be promoted and used.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
added replication related operations as a method
of rbdImage as these methods can be easily used
when we introduce volumesnaphot mirroring operations.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
the rbd mirror state can be in enabled,disabled
or disabling state. If the mirroring is not disabled
yet and still in disabling state. we need to
check for it and return abort error message if
the mirroring is still getting disabled.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
added ReplicationServer struct for the replication related
operation it also embed the ControllerServer which
already implements the helper functions like locking/unlocking etc.
removed getVolumeFromID and cleanup functions for better
code readability and easy maintaince.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
After translating options from the ConfigMap into the common Vault
parameters, the generated configuration is not used. Instead, the
untranslated version of the configuration is passed on to the
vaultConnection initialization function, which then can detects missing
options.
By passing the right configuration to the initializatino function,
things work as intended.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
When using .BinaryData, the contents of the configuration is not parsed
correctly. Whereas the parsing works fine whet .Data is used.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
This commit fixes bug in unmount function which caused
unmountVolume to fail when targetPath was already unmounted.
Signed-off-by: Rakshith R <rar@redhat.com>
There is no need for each EncryptionKMS to implement the same GetID()
function. We have a VolumeEncryption type that is more suitable for
keeping track of the KMS-ID that was used to get the configuration of
the KMS.
This does not change any metadata that is stored anywhere.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
GetKMS() is the public API that initilizes the KMS providers on demand.
Each provider identifies itself with a KMS-Type, and adds its own
initialization function to a switch/case construct. This is not well
maintainable.
The new GetKMS() can be used the same way, but uses the new kmsManager
interface to create and configure the KMS provider instances.
All existing KMS providers are converted to use the new kmsManager
plugins API.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The KMSProvider struct is a simple, extendable type that can be used to
register KMS providers with an internal kmsManager.
Helper functions for creating and configuring KMS providers will also be
located in the new kms.go file. This makes things more modular and
better maintainable.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Current rbd plugin only supports the layering feature
for rbd image. Add exclusive-lock and journaling image
features for the rbd.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Signed-off-by: woohhan <woohyung_han@tmax.co.kr>
Failed to delete voluesnapshot when backend subvolume
(pvc) and ceph fs subvolume snapshot is deleted
Fixes#1647
Signed-off-by: Yati Padia <ypadia@redhat.com>
rbdVolumes can have several resources that get allocated during its
usage. Only destroying the IOContext may not be suffiecient and can
cause resource leaks.
Use rbdVolume.Destroy() when the rbdVolume is not used anymore.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Connections are reference counted, so just assigning the connection to
an other object for re-use is not correct. This can cause connections to
be garbage collected while something else is still using it.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
as RBD is implementing the replication
we are registering it. For CephFS, its
not implementing the replication we are
passing nil so we dont want to register
it.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Because rbdVolume and rbdSnapshot are very similar, they can be based
off a common struct rbdImage that contains the common attributes and
functions.
This makes it possible to re-use functions for snapshots, and prevents
further duplication or code.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The rbdSnapshot and rbdVolume structs have many common attributes. In
order to combine these into an rbdImage struct that implements shared
functionality, having the same attribute for the ID makes things much
easier.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
This new KMS is based on the (default) SecretsKMS, but instead of using
the passphrase for all volumes, the passphrase is used to
encrypt/decrypt a Data-Encryption-Key that is stored in the metadata of
the volume.
CC: Patrick Uiterwijk <puiterwijk@redhat.com> - for encryption guidance
Signed-off-by: Niels de Vos <ndevos@redhat.com>
By adding these methods, a KMS can explicitly encrypt/decrypt the DEK if
there is no transparent way of doing so.
Hashicorp Vault encrypts the DEK when it it stored, and decrypts it when
fetched. Therefor there is no need to do any encryption in this case.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
NewVolumeEncryption() will return an indication that an alternative
DEKStore needs to be configured in case the KMS does not support it.
setKMS() will also set the DEKStore if needed, so renaming it to
configureEncryption() makes things clearer.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Use DEKStore API for Fetching and Storing passphrases.
Drop the fallback for the old KMS interface that is now provided as
DEKStore. The original implementation has been re-used for the DEKStore
interface.
This also moves GetCryptoPassphrase/StoreNewCryptoPassphrase functions
to methods of VolumeEncryption.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
DEKStore is a new interface that will be used for Storing and Fetching
DEKs. The existing implementations for KMS already function as a
DEKStore, and will be updated to match the interface.
By splitting KMS and DEKStore into two components, the encryption
configuration for volumes becomes more modular. This makes it possible
to implement a DEKStore where the encrypted DEK for a volume is stored
in the metadata of the volume (RBD image).
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Prepare for grouping encryption related functions together. The main
rbdVolume object should not be cluttered with KMS or DEK procedures.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Prepared for an enhanced API to communicate with a KMS and keep the DEK
storage separate. The crypto.go file is already mixed with different
functions, so moving the KMS part into its own file, just like we have
for Hashicorp Vault KMS's.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
For NodeUnstageVolume its a two step process,
first unmount the volume and than unmap the volume.
Currently, we are logging only after rbd unmapping is done.
sometimes it becomes difficult to debug with above logging
whether more time is spent in unmount or unmap.
This commits adds one more debug log after unmount is done.
with this we can identify where exactly more time is spent
by looking at the logs.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
It seems that writing more than 1 GiB per WriteSame() operation causes
an EINVAL (22) "Invalid argument" error. Splitting the writes in blocks
of maximum 1 GiB should prevent that from happening.
Not all volumes are of a size that is the multiple of the stripe-size.
WriteSame() needs to write full blocks of data, so in case there is a
small left-over, it will be filled with WriteAt().
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Introduce initKMS() as a function of rbdVolume. KMS functionality does
not need to pollute general RBD image functions. Encryption functions
are now in internal/rbd.encryption.go, so move initKMS() there as well.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
when user provides an option for VolumeNamePrefix
create subvolume with the prefix which will be easy
for user to identify the subvolumes belongs to
the storageclass.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
When and RBD image is expanded, the additional extents need to get
allocated when the image was thick-provisioned.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
When images get resized/expanded, the additional space needs to be
allocated if the image was initially thick-provisioned. By marking the
image with a "thick-provisioned" key in the metadata, future operations
can check the need.
A missing "thick-provisioned" key indicates that the image has not been
thick-provisioned.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Write blocks of stripe-size to allocate RBD images when
Thick-Provisioning is enabled in the StorageClass.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Add an option to the StorageClass to support creating fully allocated
(thick provisioned) RBD images
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Signed-off-by: Niels de Vos <ndevos@redhat.com>
When a volume was provisioned by an old Ceph-CSI provisioner, the
metadata of the RBD image will contain `requiresEncryption` to indicate
a passphrase needs to be created. New Ceph-CSI provisioners create the
passphrase in the CreateVolume request, and set `encryptionPrepared`
instead.
When a new node-plugin detects that `requiresEncryption` is set in the
RBD image metadata, it will fallback to the old behaviour.
In case `encryptionPrepared` is read from the RBD image metadata, the
passphrase is used to cryptsetup/format the image.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
This adds internal/rbd/encryption.go which will be used to include other
encryption functionality to support additional KMS related functions. It
will work together with the shared API from internal/util/kms.go.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Storing a passphrase is now done while the volume is created. There is
no need to (re)generate a passphrase when it can not be found.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Have the provisioner create the passphrase for the volume, instead of
doign it lazily at the time the volume is used for the 1st time. This
prevents potential races where pods on different nodes try to store
different passphrases at the (almost) same time.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
"VAULT_SKIP_VERIFY" is a standard Hashicorp Vault environment variable
(a string) that needs to get converted to the "vaultCAVerify"
configuration option in the Ceph-CSI format.
The value of "VAULT_SKIP_VERIFY" means the reverse of "vaultCAVerify",
this part was missing in the original conversion too.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
It seems that calls to addRbdManagerTask() do not include the
rados-namespace in the image location. Functions calling
addRbdManagerTask() construct the image location themselves, but should
use rbdVolume.String() to include all the attributes.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
There are many usecases with adding the subvolume
path to the PV object. the volume context returned
in the createVolumeResponse is added to the PV object
by the external provisioner.
More Details about the usecases are in below link
https://github.com/rook/rook/issues/5471
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
the tenant/namespace is needed to read the certificates,
this commit sets the tenant in kms object.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
currently, the keys for kms certificates/keys in a
secret is ca.cert, tls.cert and
tls.key, this commit changes the key from ca.cert
and tls.cert to cert and tls.key to key.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
if are reading the kms data from the file.
than only we need to unmarshal. If we are reading
from the configmap it already returns the unmarshal
data.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
The configuration option `EnvVaultInsecure` is expected to be a string,
not a boolean. By converting the bool back to a string (after
verification), it is now possible to skip the certificate validation
check by setting `vaultCAVerify: false` in the Vault configuration.
Fixes: #1852
Reported-by: Bryon Nevis <bryon.nevis@intel.com>
Signed-off-by: Niels de Vos <ndevos@redhat.com>
When the KMS VaultTokens is configured through a Kubernetens ConfigMap,
the `VAULT_SKIP_VERIFY` option was not taken into account. The option
maps to the `vaultCAVerify` value in the configuration file, but has the
reverse meaning.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
This can happen when the subvolume is in snapshot-retained state.
We should not return error for such case as it is a valid situation.
Signed-off-by: Mudit Agarwal <muagarwa@redhat.com>
Currently cephcsi is returning an error
if the ENV variable is set, but it should not.
This commit fixes the the POD_NAMESPACE env
variable issue and as well as the KMS_CONFIG_NAME
ENV variable.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Make rbdplugin pod work in a non-initial network namespace (i.e. with
"hostNetwork: false") by skipping waiting for udev events when mapping
and unmapping images. CSI use case is very simple: all that is needed
is a device node which is immediately fed to mkfs, so we should be able
to tolerate udev not being finished with the device just fine.
Fixes: #1323
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
With the new support for passing --options, referring to ExecCommand()
argument slices as mapOptions and options is confusing.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Currently, we are using bool pointer to find out
the ceph cluster supports resize or not. This
commit replaces the bool pointer with enum.
Signed-off-by: Yati Padia <ypadia@redhat.com>
Fixes#1764
mount packges is moved from
k8s.io/utils/mount to a new repository
k8s.io/mount-utils. updated code to use
the same.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
if the kms encryption configmap is not mounted
as a volume to the CSI pods, add the code to
read the configuration from the kubernetes. Later
the code to fetch the configmap will be moved to
the new sidecar which is will talk to respective
CO to fetch the encryption configurations.
The k8s configmap uses the standard vault spefic
names to add the configurations. this will be converted
back to the CSI configurations.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
A tenant can place a ConfigMap in their Kubernetes Namespace with
configuration options that differ from the global (by the Storage Admin
set) values.
The ConfigMap needs to be located in the Tenants namespace, as described
in the documentation
See-also: docs/design/proposals/encryption-with-vault-tokens.md
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Added a option to pass the client certificate
and the client certificate key for the vault token
based encryption.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Tenants (Kubernetes Namespaces) can use their own Vault Token to manage
the encryption keys for PVCs. The working is documented in #1743.
See-also: #1743Closes: #1500
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Add a new method to the EncryptionKMS interface so that resources can be
freed when EncryptionKMS instances get freed.
With the move to using the libopenstorage API, a temporary file needs to
store the optional CA certificate. The Destroy() method of the
vaultConnection type now removes this file.
The rbdVolume uses the EncryptionKMS type now, so call the new Destroy()
method from withing rbdVolume.Destroy().
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Make it possible to calle initConnection() multiple times. This enables
the VaultTokensKMS type to override global settings with options from a
per-tenant configuration.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
This makes it possible to pass a more complex configuration to the
initialize functions for KMS's. The upcoming VaultTokensKMS can use
overrides for configiration options on a per tenant basis. Without this
change, it would not be possible to consume the JSON configuration file.
See-also: #1743
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The Owner of an RBD image (Kubernetes Namespace, tenant) can be used to
identify additional configuration options. This will be used for
fetching the right Vault Token when encrypting/decrypting volumes.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
if the user has created a static PV for a RBD
image which is not created by CSI driver, dont
generate the OMAP data.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
If cephcsi encounters any error after
reservation, as a cleanup operation
it should revert back the reservation.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
If the omap data already exits return nil.
so that omap generator will not try to reserve
anything again.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
clusterAdditionalInfo map is holding a localClusterState
for checking ceph cluster supports resize and subvolumegroup
is created or not, currently we are checking if the key is present
in a map and localClusterStatelocalClusterState.resizeSupported
is set to false to call ceph fs subvolume resize to check command is
supported or not, if a structure is initialized all its members
are set to default value. so we will never going to check the
ceph fs subvolume resize command is supported in backend or not, we are
always using ceph fs subvolume create to resize subvolume. in some
ceph version ceph fs subvolume create wont work to resize a subvolume.
This commit changes the resizeSupported from bool to *bool for
proper handling of this scenario.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
go ceph returns NotImplementedError for invalid
commands,cephcsi is using errors.As to find out
the error.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
go ceph returns NotImplementedError for invalid
commands,cephcsi is using errors.As to find out
the error.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
In order to re-use the configuration of Vault, split a new
vaultConnection type from the VaultKMS type.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
getCloneInfo() does not need to return a full CloneStatus struct that
only has one member. Instead, it can just return the value of the single
member, so the JSON type/struct does not need to be exposed.
This makes the API for getCloneInfo() a little simpler, so it can be
replaced by a go-ceph implementation later on.
As the function does not return any of the unused attributes anymore, it
is renamed to getCloneStatu() as well.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Instead of the hand-rolled Vault usage, use the libopenstorage/secrets
package that provides a nice API. The support for Vault becomes much
simpler and maintainable that way.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
earlier if the depth check fails the
complete vol struct was getting logged,
this commits logs only the pool and image
name.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
In the case of Disaster Recovery failover, the
user expected to create the static PVC's. We have
planned not to go with the PVC name and namespace
for many reasons (as in kubernetes it's planned to
support PVC transfer to a new namespace with a
different name and with new features coming in
like data populator etc). For now, we are
planning to go with static PVC's to support
async mirroring.
During Async mirroring only the RBD images are
mirrored to the secondary site, and when the
user creates the static PVC's on the failover
we need to regenerate the omap data. The
volumeHandler in PV spec is an encoded string
which contains clusterID and poolID and image UUID,
The clusterID and poolID won't remain same on both
the clusters, for that cephcsi need to generate the
new volume handler and its to create a mapping
between new volume handler and old volume handler
with that whenever cephcsi gets csi requests it
check if the mapping exists it will pull the new
volume handler and continues other operations.
The new controller watches for the PVs created,
It checks if the omap exists if it doesn't it
will regenerate the entire omap data.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
in case of mirrored image, if the image is
primary a watcher will be added by the rbd
mirror deamon on the rbd image.
we have to consider 2 watcher to check image
is in use.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
incase of async mirroring the volume UUID is
retrieved from the volume name, instead of cephcsi
generating a new UUID it should reserve the passed
UUID it will be useful when we support both metro DR
and async mirroring on a kubernetes clusters.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
An rbd image can have a maximum number of
snapshots defined by maxsnapshotsonimage
On the limit is reached the cephcsi will
start flattening the older snapshots and
returns the ABORT error message, The Request
comes after this as to wait till all the
images are flattened (this will increase the
PVC creation time. Instead of waiting till
the maximum snapshots on an RBD image, we can
have a soft limit, once the limit reached
cephcsi will start flattening the task to
break the chain. With this PVC creation time
will only be affected when the hard limit
(minsnapshotsonimage) reached.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
The function isCloneRetryError verifies
if the clone error is `pending` or
`in-progress` error.
Co-authored-by: Madhu Rajanna <madhupr007@gmail.com>
Signed-off-by: Yug <yuggupta27@gmail.com>
In certain cases, clone status can be 'pending'.
In that case, abort error message should be
returned similar to that during 'in-progress'
state.
Co-authored-by: Madhu Rajanna <madhupr007@gmail.com>
Signed-off-by: Yug <yuggupta27@gmail.com>
There is a type-check on BytesQuota after calling SubVolumeInfo() to see
if the value is supported. In case no quota is configured, the value
Infinite is returned. This can not be converted to an int64, so the
original code returned an error.
It seems that attaching/mounting sometimes fails with the following
error:
FailedMount: MountVolume.MountDevice failed for volume "pvc-0e8fdd18-873b-4420-bd27-fa6c02a49496" : rpc error: code = Internal desc = subvolume csi-vol-0d68d71a-1f5f-11eb-96d2-0242ac110012 has unsupported quota: infinite
By ignoring the quota of Infinite, and not setting a quota in the
Subvolume object, this problem should not happen again.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The implementation of getOMapValues assumed that the number of key-value
pairs assigned to the object would be close to the number of keys
being requested. When the number of keys on the object exceeded the
"listExcess" value the function would fail to read additional keys
even if they existed in the omap.
This change sets a large fixed "chunk size" value and keeps reading
key-value pairs as long as the callback gets called and increments
the numKeys counter.
Signed-off-by: John Mulligan <jmulligan@redhat.com>
When using go-ceph and the volumeOptions.Connect() call, the credentials
are not needed once the connection is established.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reduce the number of calls to the `ceph fs` executable to improve
performance of CephFS volume resizing.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
This prepares resizeVolume() so that the volumeOptions.conn can be used
for connecting with go-ceph and use the connection cache.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
We have below exported function in credentials.go which is not
called from anywhere in the repo. Removing it for the same reason.
```
// NewCredentials generates new credentials when id and key
// are provided.
func NewCredentials(id, key string) (*Credentials, error) {
...
```
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
`cap` builtin function returns the capacity of a type. Its not
good practice to use this builtin function for other variable
names, removing it here
Ref# https://golang.org/pkg/builtin/#cap
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
golang-ci suddenly complains about the following issue
internal/cephfs/util.go:41:1: directive `// nolint:unparam // todo:program values has to be revisited later` is unused for linter unparam (nolintlint)
// nolint:unparam // todo:program values has to be revisited later
^
Dropping the comment completely seems to fix it. Ideally
execCommandJSON() will get removed once the migration to go-ceph is
complete.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
volJournal.Connect() got the error on err2 variable, however
the return was on variable err which hold the error return of
DecomposeCSIID() which is wrong. This cause the error return wrongly
parsed and pushed from the caller. From now on, we are reusing the
err variable to hold and revert the error of volJournal.Connect().
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
Previously the purgeVolume error was ignored due to wrong error variable
check in the createVolume. With this change it checks on the proper error.
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
The allocated, and potentially connected, volumeOptions object in
newVolumeOptionsFromVolID() is not cleaned-up in case of errors. This
could cause resource leaks.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Without connection, follow-up oparations on the volumeOptions object
will cause a panic. This should fix a regression in CephFS testing.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
All the previous condition checks exit from the function and
when it reach to this block its obvious that error is non nil,
we dont need an extra check here.
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
There is no need to pass all secrets on to newVolumeOptions(), it only
needs the credentials. As the caller of newVolumeOptions() already has
the credentials generated, just pass them along instead of the raw
secrets.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The credentials are not used anymore, the volume object is already
connected to the cluster when createVolume() is called.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The go-ceph CephFS Admin API needs a rados.Conn to connect the Admin
interface to the Ceph cluster. As the rados.Conn is internal to the
ClusterConnection type, add GetFSAdmin() to create a new FSAdmin
instance for a specific connection.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Add the ClusterConnection to the volumeOptions type, so that future use
of go-ceph can connect to the Ceph cluster.
Once a volumeOptions object is not needed anymore, it needs to get
destroyed to free associated resources like the ClusterConnection.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The error check condition in genVolFromID() is always false as far as
code reading/workflow goes. Removing it for the same reason.
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
cephcsi uses cli for fetching snap list as well as to check the
snapshot namespace, replaced that with go-ceph calls.
Signed-off-by: Mudit Agarwal <muagarwa@redhat.com>
return a proper error message to the user when
the subvolume has the snapshots and it cannot
be removed until the snapshots on the subvolume
have to be deleted.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
When passing
fuseMountOptions: debug
in the StorageClass, the mount options passed on the ceph-fuse
commandline result in "-o nonempty ,debug". The additional space before
the ",debug" causes the mount command to fail.
Fixes: 1485
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The subvolume features consists the list of features, which if includes
"snapshot-autoprotect", result in query based approach to
detecting the need for protect/unprotect.
If "snapshot-autoprotect" feature is present, The UnprotectSnapshot
call should be treated as a no-op
Signed-off-by: Yug <yuggupta27@gmail.com>
The subvolume features consists the list of features, which if includes
"snapshot-autoprotect", result in query based approach to
detecting the need for protect/unprotect.
If "snapshot-autoprotect" feature is present, The ProtectSnapshot
call should be treated as a no-op
Signed-off-by: Yug <yuggupta27@gmail.com>
Use subvolume info to fetch the subvolume path.
If `subvolume info` command is not available,
use `getpath` command instead.
Signed-off-by: Yug <yuggupta27@gmail.com>
Snapshots can be retained even after subvolume deletion in
Ceph 14.2.12. Adding support for the same in ceph-csi.
Signed-off-by: Yug <yuggupta27@gmail.com>
It doesnot make sense to allow the creation of empty
volumes with readonly access, this commit allows the
creation of volume which is having readonly capabilities
only if the content source is set for the volume.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
It doesnot make sense to allow the creation of empty
volumes which is going to be accessed with readonly mode,
this commit allows the creation of volume which is having
readonly capabilities only if the content source is set
for the volume.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This spec add the extra capability to node and controller
volume to report volume condition of a pv..etc.
Refer # https://github.com/ceph/ceph-csi/issues/1356
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
Form kubernetes v1.19 onwards NodeRequest is getting volume path
in StagingTargetPath instead of VolumePath, cephcsi should also
use the same.
Signed-off-by: Mudit Agarwal <muagarwa@redhat.com>
updateVolWithImageInfo() is currently executing an rbd command
to get details about an RBD image. Replaced it with the
required go-ceph functions.
Signed-off-by: Mudit Agarwal <muagarwa@redhat.com>
in case of clone failure, we need to first delete
the clone and the snapshot from which we created
the clone, then as part of cleanup we need to remove
the temporary cloned image and the temporary snapshot
created on the parent image.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
we should not return the CLI errors in GRPC errors
we need to return proper readable error messages
to the user for better understanding and better
debugging.
updates #1242
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
At CSI spec < 1.2.0, there was no volumecapability in the
expand request. However its available from v1.2+ which allows
us to declare the node operations based on the volume mode.
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
currently the lock is not released which is
taken on the request name. this is causing issues
when the subvolume is requested for delete.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
execCommandErr returns both error and stderror
message. checking strings.HasPrefix is not helpful
as the stderr will be the first string. its good
to do string comparison and find out that error
is volume not found error.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
rename FatalLog to FatalLogMsg to keep functions
in parity functions ends with Msg if its only message
logging.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
as we have 2 functions for logging. one for logging
with message and another one is for logging with
context. renamed ErrorLog to ErrorLogMsg to log
with messages.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
if the image is created without flattening image-feature
the image will get few image-features by default, deep-flatten
is one of them. if the image doesnot have any parent
the rbd image flattening will fail, This commit discards
error message if the image doesnt have any parent.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
merging of https://github.com/ceph/ceph-csi/pull/1035
broken the cephcsi building. This commits fixes
the build issue.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Make sure to operate within the namespace if any given
when dealing with rbd images and snapshots and their journals.
Signed-off-by: Mehdy Khoshnoody <mehdy.khoshnoody@gmail.com>
Also add functionality to generate snap from request
and to get mon and clusterID from the request
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
From provided CSI volume ID this populate volumeOptions and snapshot
identifier after connecting to the snapJournal.
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
Compared to previous version of the error strings, this change
depend on error strings like ENOENT, EEXIST, EINVAL..etc
The format of the error strings change in different cluster versions
and the error code return should not change. This also add extra
error strings for snapshot and clone operation outputs
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
checkContentSource() validate the data source in the request
and then populate volumeOptions or snapshotshot identifier in
case of snapshot source. If the data source is volume, then
parentVolumeOption and pvID are populated.
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
adjust createBackingVolume() to create a subvolume from snapshot
or existing subvolume by taking restore or clone operation locks
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
if we are not able to fetch the cluster-ID from
the createSnapshot request and also if we are
not able to get the monitor information from
the cluster-ID return error instead of using
the parent image information.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Replaced command execution with go-ceph Resize() function.
Volsize is being updated before waiting for resize() to return,
fixed it to get updated only after resize() is successful.
Signed-off-by: Mudit Agarwal <muagarwa@redhat.com>
While adding the context.Context to the resizeRBDimage() function, it
became a little ugly. So renaming the function to resize() and making it
a method of the rbdVolume type.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Most consumers of util.ExecCommand() need to convert the returned []byte
format of stdout and/or stderr to string. By having util.ExecCommand()
return strings instead, the code gets a little simpler.
A few commands return JSON that needs to be parsed. These commands will
be replaced by go-ceph implementations later on. For now, convert the
strings back to []byte when needed.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
All calls to util.ExecCommand() now pass the context.Context. In some
cases this is not possible or needed, and util.ExecCommand() will not
log the command.
This should make debugging easier when command executions fail.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Current versions of the mkfs.xfs binary enable reflink support by
default. This causes problems on systems where the kernel does not
support this feature. When the kernel the feature does not support, but
the filesystem has it enabled, the following error is logged in `dmesg`:
XFS: Superblock has unknown read-only compatible features (0x4) enabled
Introduce a check to see if mkfs.xfs supports the `-m reflink=` option.
In case it does, pass `-m reflink=0` while creating the filesystem.
The check is executed once during the first XFS filesystem creation. The
result of the check is cached until the nodeserver restarts.
Fixes: #966
Signed-off-by: Niels de Vos <ndevos@redhat.com>
The new rbdVolume.isInUse() method will replace the rbdStatus()
function. This removes one more rbd command execution in the
DeleteVolume path.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
This change replaces the sentinel errors in rbd module with
standard errors created with errors.New().
Related: #1203
Signed-off-by: Sven Anderson <sven@redhat.com>
This change replaces the sentinel errors in cephfs module with
standard errors created with errors.New().
Related: #1203
Signed-off-by: Sven Anderson <sven@redhat.com>
The sentinel error code had additional fields in the errors, that are
used nowhere. This leads to unneccesarily complicated code. This
change replaces the sentinel errors in utils with standard errors
created with errors.New() and adds a simple JoinErrors() function to
be able to combine sentinel errors from different code tiers.
Related: #1203
Signed-off-by: Sven Anderson <sven@redhat.com>
Take operation locks on the resources before operating
on the resouces. This allows us to do parallel operations
for some RPC calls such as Clone and Restore of PVC.
This operations will only be blocked if the image is
expanding or Snapshot and RBD image is getting deleted.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
As we are adding new functionalities like Create/Delete
snapshot,Clone from Snapshot and Clone from Volume.
with the current implementation, there are only serial
operations allowed for this functionalities, for some
function we can allow parallel operations like
Clone from snapshot and Clone from Volume and Create
`N` snapshots on a single volume.
Delete Volume: Need to ensure that there is no clone,
Snapshot create and Expand volume in progress.
Expand Volume: Need to ensure that there is no clone,
snapshot create and cloning in progress
Delete Snapshot: Need to ensure that there is no
cloning in progress
Restore Volume/Snapshot: Need to ensure that there is
no Expand or delete operation in progress.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Direct usage of numbers should be avoided.
Issue reported:
mnd: Magic number: X, in <argument> detected (gomnd)
Signed-off-by: Yug <yuggupta27@gmail.com>
Add explanation to nolint directives.
Issue reported:
whyNoLint: include an explanation for nolint directive (gocritic)
Signed-off-by: Yug <yuggupta27@gmail.com>
In Go 1.13, the fmt.Errorf function supports a new %w verb.
When this verb is present, the error returned by fmt.Errorf
will have an Unwrap method returning the argument of %w,
which must be an error. In all other ways, %w is identical to %v.
Updates: #1227
Signed-off-by: Yug <yuggupta27@gmail.com>
In some ceph version if the subvolume is not present, the
ceph returns doesnot exists and in some version not found
error message. This commit fixes issue for both error
checks.
By only checking Error ENOENT: for doesnot exist seems good.
even if some error message changes in ceph ceph-csi wont get
any issue.
```bash
sh-4.2# ceph version
ceph version 14.2.10 (b340acf629a010a74d90da5782a2c5fe0b54ac20) nautilus (stable)
sh-4.2# ceph fs subvolume getpath myfs csi-vol-a24a3d97-c7f4-11ea-8cfc-0242ac110012 --group_name csi
Error ENOENT: subvolume 'csi-vol-a24a3d97-c7f4-11ea-8cfc-0242ac110012' does not exist
```
```bash
sh-4.2# ceph version
ceph version 14.2.4 (75f4de193b3ea58512f204623e6c5a16e6c1e1ba) nautilus (stable)
sh-4.2# ceph fs subvolume getpath myfs testing --group_name=csi
Error ENOENT: Subvolume 'testing' not found
```
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
If the requested volume size and the snapshot or the
parent volume from which the clone is to be created
is not equal cephcsi returns an error message.
updates #1188
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
If the image in the chain is moved to trash, we
cannot get the image details. We need to return the
found depth to the caller.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
If the snapshots on the parent image exceeds
maxSnapshotsOnImage count, we need to flatten
all the temporary cloned images to over come the
krbd issue of maximum number of snapshots on
an image.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
create temporary snapshot on the parent image same as
name as the temporary clone rbd image. Naming the snapshot
and the temporary cloned image helps to flatten the temporary
cloned images when the snapshots on the parent image exceeds
the configured maxSnapshotsOnImage.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
rename newVolumeOptionsFromVersion1Context to newVolumeOptionsFromMonitorList
to provide more clarity to the function readers and also fixed comments.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
as v1.0.0 is deprecated we need to remove the support
for it in the Next coming (v3.0.0) release. This PR
removes the support for the same.
closes#882
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Added support for RBD PVC to PVC cloning, below
commands are executed to create a PVC-PVC clone from
RBD side.
* Check the depth(n) of the cloned image if n>=(hard limit -2)
or ((soft limit-2) Add a task to flatten the image and return
about (to avoid image leak) **Note** will try to flatten the
temp clone image in the chain if available
* Reserve the key and values in omap (this will help us to
avoid the leak as it's not reserved earlier as we have returned
ABORT (the request may not come back))
* Create a snapshot of rbd image
* Clone the snapshot (temp clone)
* Delete the snapshot
* Snapshot the temp clone
* Clone the snapshot (final clone)
* Delete the snapshot
```bash
1) check the image depth of the parent image if flatten required
add a task to flatten image and return ABORT to avoid leak
(hardlimit-2 and softlimit-2 check will be done)
2) Reserve omap keys
2) rbd snap create <RBD image for src k8s volume>@<random snap name>
3) rbd clone --rbd-default-clone-format 2 --image-feature
layering,deep-flatten <RBD image for src k8s volume>@<random snap>
<RBD image for temporary snap image>
4) rbd snap rm <RBD image for src k8s volume>@<random snap name>
5) rbd snap create <cloned RBD image created in snapshot process>@<random snap name>
6) rbd clone --rbd-default-clone-format 2 --image-feature <k8s dst vol config>
<RBD image for temporary snap image>@<random snap name> <RBD image for k8s dst vol>
7)rbd snap rm <RBD image for src k8s volume>@<random snap name>
```
* Delete temporary clone image created as part of clone(delete if present)
* Delete rbd image
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
during the checkSnapCloneExists we are checking
the image, if the image not found we are deleting
the snapshot on the parent image, This PR corrects
the comparasion. instead of snapshotNotFound we need
to check ImageNotFound error.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
updated unit testing for the kernel check
for deep flatten feature for both supported
upstream kernel version (5.1.0+) and RHEL
8.2 backport
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
as RHEL 8.2 supports the deep-flatten
feature, added it to the list to map
the rbd images on the node without flattening.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
as v5.1.0 supports the deep-flatten feature,lowering
the required version to map rbd images which
are having deep-flatten feature
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
we need to take lock on parent rbd image when
we are creating a snapshot from it, if the user
tries to delete/resize the rbd image when we are
taking snapshots,we may face issues. if the volume
lock is present on the rbd image, the user cannot
resize the rbd image nor delete the rbd image.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
flatten cloned images to remove the link
with the snapshot as the parent snapshot can
be removed from the trash.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Added maxsnapshotsonimage flag to flatten
the older rbd images on the chain to avoid
issue in krbd.The limit is in krbd since it
only allocate 1 4KiB page to handle all the
snapshot ids for an image.
The max limit is 510 as per
https://github.com/torvalds/linux/blob/
aaa2faab4ed8e5fe0111e04d6e168c028fe2987f/drivers/block/rbd.c#L98
in cephcsi we arekeeping the default to 450 to reserve 10%
to avoid issues.
Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
