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101 lines
2.5 KiB
101 lines
2.5 KiB
package filer
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import (
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"bytes"
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"context"
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"fmt"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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)
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func (fsw *FilerStoreWrapper) handleUpdateToHardLinks(ctx context.Context, entry *Entry) error {
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if len(entry.HardLinkId) == 0 {
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return nil
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}
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// handle hard links
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if err := fsw.setHardLink(ctx, entry); err != nil {
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return fmt.Errorf("setHardLink %d: %v", entry.HardLinkId, err)
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}
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// check what is existing entry
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glog.V(4).Infof("handleUpdateToHardLinks FindEntry %s", entry.FullPath)
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existingEntry, err := fsw.ActualStore.FindEntry(ctx, entry.FullPath)
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if err != nil && err != filer_pb.ErrNotFound {
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return fmt.Errorf("update existing entry %s: %v", entry.FullPath, err)
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}
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// remove old hard link
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if err == nil && len(existingEntry.HardLinkId) != 0 && bytes.Compare(existingEntry.HardLinkId, entry.HardLinkId) != 0 {
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glog.V(4).Infof("handleUpdateToHardLinks DeleteHardLink %s", entry.FullPath)
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if err = fsw.DeleteHardLink(ctx, existingEntry.HardLinkId); err != nil {
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return err
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}
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}
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return nil
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}
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func (fsw *FilerStoreWrapper) setHardLink(ctx context.Context, entry *Entry) error {
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if len(entry.HardLinkId) == 0 {
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return nil
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}
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key := entry.HardLinkId
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newBlob, encodeErr := entry.EncodeAttributesAndChunks()
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if encodeErr != nil {
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return encodeErr
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}
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return fsw.KvPut(ctx, key, newBlob)
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}
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func (fsw *FilerStoreWrapper) maybeReadHardLink(ctx context.Context, entry *Entry) error {
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if len(entry.HardLinkId) == 0 {
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return nil
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}
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key := entry.HardLinkId
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glog.V(4).Infof("maybeReadHardLink KvGet %v", key)
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value, err := fsw.KvGet(ctx, key)
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if err != nil {
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glog.Errorf("read %s hardlink %d: %v", entry.FullPath, entry.HardLinkId, err)
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return err
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}
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if err = entry.DecodeAttributesAndChunks(value); err != nil {
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glog.Errorf("decode %s hardlink %d: %v", entry.FullPath, entry.HardLinkId, err)
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return err
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}
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return nil
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}
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func (fsw *FilerStoreWrapper) DeleteHardLink(ctx context.Context, hardLinkId HardLinkId) error {
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key := hardLinkId
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value, err := fsw.KvGet(ctx, key)
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if err == ErrKvNotFound {
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return nil
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}
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if err != nil {
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return err
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}
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entry := &Entry{}
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if err = entry.DecodeAttributesAndChunks(value); err != nil {
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return err
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}
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entry.HardLinkCounter--
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if entry.HardLinkCounter <= 0 {
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glog.V(4).Infof("DeleteHardLink KvDelete %v", key)
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return fsw.KvDelete(ctx, key)
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}
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newBlob, encodeErr := entry.EncodeAttributesAndChunks()
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if encodeErr != nil {
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return encodeErr
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}
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glog.V(4).Infof("DeleteHardLink KvPut %v", key)
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return fsw.KvPut(ctx, key, newBlob)
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}
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