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daemon: read-copy-update the daemon config

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Ensure data-race-free access to the daemon configuration without
locking by mutating a deep copy of the config and atomically storing
a pointer to the copy into the daemon-wide configStore value. Any
operations which need to read from the daemon config must capture the
configStore value only once and pass it around to guarantee a consistent
view of the config.

Signed-off-by: Cory Snider <csnider@mirantis.com>
This commit is contained in:
Cory Snider
2022-08-17 17:13:49 -04:00
parent 742ac6e275
commit 0b592467d9
62 changed files with 1819 additions and 568 deletions
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3
daemon/update.go
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@@ -13,7 +13,8 @@ import (
func (daemon *Daemon) ContainerUpdate(name string, hostConfig *container.HostConfig) (container.ContainerUpdateOKBody, error) {
var warnings []string
warnings, err := daemon.verifyContainerSettings(hostConfig, nil, true)
daemonCfg := daemon.config()
warnings, err := daemon.verifyContainerSettings(daemonCfg, hostConfig, nil, true)
if err != nil {
return container.ContainerUpdateOKBody{Warnings: warnings}, errdefs.InvalidParameter(err)
}