1
0
Fork 0
mirror of https://github.com/restic/restic.git synced 2024-12-23 00:07:25 +00:00
restic/internal/restorer/hardlinks_index.go
Michael Eischer a8fdcf79b7 restorer: Make hardlink index generic
This will allow reusing it for the stats command without regressing the
memory usage due to storing an unnecessary file path.
2023-10-27 23:40:42 +02:00

57 lines
1.4 KiB
Go

package restorer
import (
"sync"
)
// HardlinkKey is a composed key for finding inodes on a specific device.
type HardlinkKey struct {
Inode, Device uint64
}
// HardlinkIndex contains a list of inodes, devices these inodes are one, and associated file names.
type HardlinkIndex[T any] struct {
m sync.Mutex
Index map[HardlinkKey]T
}
// NewHardlinkIndex create a new index for hard links
func NewHardlinkIndex[T any]() *HardlinkIndex[T] {
return &HardlinkIndex[T]{
Index: make(map[HardlinkKey]T),
}
}
// Has checks wether the link already exist in the index.
func (idx *HardlinkIndex[T]) Has(inode uint64, device uint64) bool {
idx.m.Lock()
defer idx.m.Unlock()
_, ok := idx.Index[HardlinkKey{inode, device}]
return ok
}
// Add adds a link to the index.
func (idx *HardlinkIndex[T]) Add(inode uint64, device uint64, value T) {
idx.m.Lock()
defer idx.m.Unlock()
_, ok := idx.Index[HardlinkKey{inode, device}]
if !ok {
idx.Index[HardlinkKey{inode, device}] = value
}
}
// Value obtains the filename from the index.
func (idx *HardlinkIndex[T]) Value(inode uint64, device uint64) T {
idx.m.Lock()
defer idx.m.Unlock()
return idx.Index[HardlinkKey{inode, device}]
}
// Remove removes a link from the index.
func (idx *HardlinkIndex[T]) Remove(inode uint64, device uint64) {
idx.m.Lock()
defer idx.m.Unlock()
delete(idx.Index, HardlinkKey{inode, device})
}