frostfs-node/pkg/local_object_storage/shard/writecache.go
Evgenii Stratonikov 3d882e9f47 [#1806] engine: Allow to flush write-cache
Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
2022-09-28 09:28:01 +03:00

36 lines
886 B
Go

package shard
import (
"errors"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard/mode"
)
// errWriteCacheDisabled is returned when an operation on write-cache is performed,
// but write-cache is disabled.
var errWriteCacheDisabled = errors.New("write-cache is disabled")
// FlushWriteCache moves writecache in read-only mode and flushes all data from it.
// After the operation writecache will remain read-only mode.
func (s *Shard) FlushWriteCache() error {
if !s.hasWriteCache() {
return errWriteCacheDisabled
}
s.m.RLock()
defer s.m.RUnlock()
// To write data to the blobstor we need to write to the blobstor and the metabase.
if s.info.Mode.ReadOnly() {
return ErrReadOnlyMode
}
if s.info.Mode.NoMetabase() {
return ErrDegradedMode
}
if err := s.writeCache.SetMode(mode.ReadOnly); err != nil {
return err
}
return s.writeCache.Flush()
}