8074d84ff1
Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commit dd622c81a4ea8f4e625f03ee9f13ad47b8746638) Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Upstream-commit: 148d9f0e58bc180fefffcfc0a9e7a00b4276a67a Component: engine
74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
/*
|
|
Copyright The containerd Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package continuity
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
)
|
|
|
|
var (
|
|
errNotAHardLink = fmt.Errorf("invalid hardlink")
|
|
)
|
|
|
|
type hardlinkManager struct {
|
|
hardlinks map[hardlinkKey][]Resource
|
|
}
|
|
|
|
func newHardlinkManager() *hardlinkManager {
|
|
return &hardlinkManager{
|
|
hardlinks: map[hardlinkKey][]Resource{},
|
|
}
|
|
}
|
|
|
|
// Add attempts to add the resource to the hardlink manager. If the resource
|
|
// cannot be considered as a hardlink candidate, errNotAHardLink is returned.
|
|
func (hlm *hardlinkManager) Add(fi os.FileInfo, resource Resource) error {
|
|
if _, ok := resource.(Hardlinkable); !ok {
|
|
return errNotAHardLink
|
|
}
|
|
|
|
key, err := newHardlinkKey(fi)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
hlm.hardlinks[key] = append(hlm.hardlinks[key], resource)
|
|
|
|
return nil
|
|
}
|
|
|
|
// Merge processes the current state of the hardlink manager and merges any
|
|
// shared nodes into hardlinked resources.
|
|
func (hlm *hardlinkManager) Merge() ([]Resource, error) {
|
|
var resources []Resource
|
|
for key, linked := range hlm.hardlinks {
|
|
if len(linked) < 1 {
|
|
return nil, fmt.Errorf("no hardlink entrys for dev, inode pair: %#v", key)
|
|
}
|
|
|
|
merged, err := Merge(linked...)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error merging hardlink: %v", err)
|
|
}
|
|
|
|
resources = append(resources, merged)
|
|
}
|
|
|
|
return resources, nil
|
|
}
|