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Add 'consistent', 'cached', and 'delegated' mode flags 

This adds 'consistency' mode flags to the mount command line argument.
Initially, the valid 'consistency' flags are 'consistent', 'cached',
'delegated', and 'default'.

Signed-off-by: David Sheets <dsheets@docker.com>
Signed-off-by: Jeremy Yallop <yallop@docker.com>
This commit is contained in:
David Sheets 2017-02-07 12:17:21 +00:00 committed by Jeremy Yallop
parent ce79f6b644
commit f13297c0be
3 changed files with 31 additions and 4 deletions
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21
api/types/mount/mount.go
View File

@ -23,9 +23,10 @@ type Mount struct {
// Source specifies the name of the mount. Depending on mount type, this
// may be a volume name or a host path, or even ignored.
// Source is not supported for tmpfs (must be an empty value)
Source string `json:",omitempty"`
Target string `json:",omitempty"`
ReadOnly bool `json:",omitempty"`
Source string `json:",omitempty"`
Target string `json:",omitempty"`
ReadOnly bool `json:",omitempty"`
Consistency Consistency `json:",omitempty"`
BindOptions *BindOptions `json:",omitempty"`
VolumeOptions *VolumeOptions `json:",omitempty"`
@ -60,6 +61,20 @@ var Propagations = []Propagation{
PropagationSlave,
}
// Consistency represents the consistency requirements of a mount.
type Consistency string
const (
// ConsistencyFull guarantees bind-mount-like consistency
ConsistencyFull Consistency = "consistent"
// ConsistencyCached mounts can cache read data and FS structure
ConsistencyCached Consistency = "cached"
// ConsistencyDelegated mounts can cache read and written data and structure
ConsistencyDelegated Consistency = "delegated"
// ConsistencyDefault provides "consistent" behavior unless overridden
ConsistencyDefault Consistency = "default"
)
// BindOptions defines options specific to mounts of type "bind".
type BindOptions struct {
Propagation Propagation `json:",omitempty"`

2
opts/mount.go
View File

@ -95,6 +95,8 @@ func (m *MountOpt) Set(value string) error {
if err != nil {
return fmt.Errorf("invalid value for %s: %s", key, value)
}
case "consistency":
mount.Consistency = mounttypes.Consistency(strings.ToLower(value))
case "bind-propagation":
bindOptions().Propagation = mounttypes.Propagation(strings.ToLower(value))
case "volume-nocopy":

12
volume/volume_unix.go
View File

@ -30,6 +30,13 @@ var labelModes = map[string]bool{
"z": true,
}
// consistency modes
var consistencyModes = map[mounttypes.Consistency]bool{
mounttypes.ConsistencyFull: true,
mounttypes.ConsistencyCached: true,
mounttypes.ConsistencyDelegated: true,
}
// BackwardsCompatible decides whether this mount point can be
// used in old versions of Docker or not.
// Only bind mounts and local volumes can be used in old versions of Docker.
@ -62,6 +69,7 @@ func ValidMountMode(mode string) bool {
labelModeCount := 0
propagationModeCount := 0
copyModeCount := 0
consistencyModeCount := 0
for _, o := range strings.Split(mode, ",") {
switch {
@ -73,13 +81,15 @@ func ValidMountMode(mode string) bool {
propagationModeCount++
case copyModeExists(o):
copyModeCount++
case consistencyModes[mounttypes.Consistency(o)]:
consistencyModeCount++
default:
return false
}
}
// Only one string for each mode is allowed.
if rwModeCount > 1 || labelModeCount > 1 || propagationModeCount > 1 || copyModeCount > 1 {
if rwModeCount > 1 || labelModeCount > 1 || propagationModeCount > 1 || copyModeCount > 1 || consistencyModeCount > 1 {
return false
}
return true