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rbd: add maxsnapshotsonimage flag

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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>
This commit is contained in:
Madhu Rajanna
2020-07-01 10:57:11 +05:30
committed by mergify[bot]
parent c04b903eca
commit 8ef7143e6c
6 changed files with 24 additions and 3 deletions
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13
cmd/cephcsi.go
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@ -79,7 +79,7 @@ func init() {
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.UintVar(&conf.MaxSnapshotsOnImage, "maxsnapshotsonimage", 450, "Maximum number of snapshots allowed on rbd image without flattening")
flag.BoolVar(&conf.SkipForceFlatten, "skipforceflatten", false,
"skip image flattening if kernel support mapping of rbd images which has the deep-flatten feature")
@ -182,6 +182,7 @@ func main() {
switch conf.Vtype {
case rbdType:
validateCloneDepthFlag(&conf)
validateMaxSnaphostFlag(&conf)
driver := rbd.NewDriver()
driver.Run(&conf, cp)
@ -212,3 +213,13 @@ func validateCloneDepthFlag(conf *util.Config) {
klog.Fatalln("rbdsoftmaxclonedepth flag value should not be greater than rbdhardmaxclonedepth")
}
}
func validateMaxSnaphostFlag(conf *util.Config) {
// maximum number of snapshots on an image are 510 [1] and 16 images in
// a parent/child chain [2],keeping snapshot limit to 500 to avoid issues.
// [1] https://github.com/torvalds/linux/blob/master/drivers/block/rbd.c#L98
// [2] https://github.com/torvalds/linux/blob/master/drivers/block/rbd.c#L92
if conf.MaxSnapshotsOnImage == 0 || conf.MaxSnapshotsOnImage > 500 {
klog.Fatalln("maxsnapshotsonimage flag value should be between 1 and 500")
}
}