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rbd: add hardlimt and softlimit flag

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added Hardlimit and Softlimit flags for cephcsi
arguments. When the Softlimit is reached cephcsi
will start a background task to flatten the rbd
image and return success and if the hardlimit
is reached it will start a background task
to flatten the rbd image and return ready
to use as false to make sure that the image
will not be used until it is flatten.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit is contained in:
Madhu Rajanna
2020-06-24 12:14:02 +05:30
committed by mergify[bot]
parent 3e7fa93256
commit 9b518726ab
7 changed files with 56 additions and 17 deletions
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14
cmd/cephcsi.go
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@ -77,6 +77,8 @@ func init() {
flag.StringVar(&conf.HistogramOption, "histogramoption", "0.5,2,6",
"[DEPRECATED] Histogram option for grpc metrics, should be comma separated value, ex:= 0.5,2,6 where start=0.5 factor=2, count=6")
flag.UintVar(&conf.RbdHardMaxCloneDepth, "rbdhardmaxclonedepth", 8, "Hard limit for maximum number of nested volume clones that are taken before a flatten occurs")
flag.UintVar(&conf.RbdSoftMaxCloneDepth, "rbdsoftmaxclonedepth", 4, "Soft limit for maximum number of nested volume clones that are taken before a flatten occurs")
flag.BoolVar(&conf.Version, "version", false, "Print cephcsi version information")
klog.InitFlags(nil)
@ -175,6 +177,7 @@ func main() {
klog.V(1).Infof("Starting driver type: %v with name: %v", conf.Vtype, dname)
switch conf.Vtype {
case rbdType:
validateCloneDepthFlag(&conf)
driver := rbd.NewDriver()
driver.Run(&conf, cp)
@ -194,3 +197,14 @@ func main() {
os.Exit(0)
}
func validateCloneDepthFlag(conf *util.Config) {
// keeping hardlimit to 14 as max to avoid max image depth
if conf.RbdHardMaxCloneDepth == 0 || conf.RbdHardMaxCloneDepth > 14 {
klog.Fatalln("rbdhardmaxclonedepth flag value should be between 1 and 14")
}
if conf.RbdSoftMaxCloneDepth > conf.RbdHardMaxCloneDepth {
klog.Fatalln("rbdsoftmaxclonedepth flag value should not be greater than rbdhardmaxclonedepth")
}
}